diff --git a/crates/weavepy-capi/src/abi314.rs b/crates/weavepy-capi/src/abi314.rs index 1382da80..4183cb71 100644 --- a/crates/weavepy-capi/src/abi314.rs +++ b/crates/weavepy-capi/src/abi314.rs @@ -1574,13 +1574,13 @@ unsafe fn code_names( /// `PyCode_GetCellvars(code)` — new reference to `co_cellvars`. #[no_mangle] pub unsafe extern "C" fn PyCode_GetCellvars(code: *mut PyObject) -> *mut PyObject { - unsafe { code_names(code, |c| c.cellvars.clone()) } + unsafe { code_names(code, |c| c.cellvars.iter().map(String::from).collect()) } } /// `PyCode_GetFreevars(code)` — new reference to `co_freevars`. #[no_mangle] pub unsafe extern "C" fn PyCode_GetFreevars(code: *mut PyObject) -> *mut PyObject { - unsafe { code_names(code, |c| c.freevars.clone()) } + unsafe { code_names(code, |c| c.freevars.iter().map(String::from).collect()) } } // --------------------------------------------------------------------------- diff --git a/crates/weavepy-capi/src/abstract_.rs b/crates/weavepy-capi/src/abstract_.rs index 075d4c4a..5bf6031e 100644 --- a/crates/weavepy-capi/src/abstract_.rs +++ b/crates/weavepy-capi/src/abstract_.rs @@ -701,7 +701,7 @@ fn type_name(o: &Object) -> &'static str { fn callable_label(o: &Object) -> String { use Object as O; match o { - O::Function(f) => f.code().qualname.clone(), + O::Function(f) => f.code().qualname.to_string(), O::Builtin(b) => b.name.to_string(), O::Type(t) => format!("type:{}", t.name), O::BoundMethod(bm) => format!("bound:{}", callable_label(&bm.function)), diff --git a/crates/weavepy-capi/src/gc_bridge.rs b/crates/weavepy-capi/src/gc_bridge.rs index 6aa96bed..3275331f 100644 --- a/crates/weavepy-capi/src/gc_bridge.rs +++ b/crates/weavepy-capi/src/gc_bridge.rs @@ -144,8 +144,10 @@ fn has_clear(obj: &Object) -> bool { /// once from [`crate::interp::ensure_initialised`], before any extension /// code (hence any C GC type) can run. pub fn install() { - weavepy_vm::gc_trace::register_traverse(has_traverse, traverse); - weavepy_vm::gc_trace::register_clear(has_clear, clear); + // (Both match instances only; see `instance_type_ptr`.) + let kind = weavepy_vm::gc_trace::hook_kind::INSTANCE; + weavepy_vm::gc_trace::register_traverse_for(kind, has_traverse, traverse); + weavepy_vm::gc_trace::register_clear_for(kind, has_clear, clear); } // ==================================================================== @@ -253,8 +255,7 @@ pub unsafe extern "C" fn PyObject_GC_IsTracked(op: *mut c_void) -> c_int { return 0; } let obj = unsafe { crate::object::clone_object(op as *mut PyObject) }; - let id = weavepy_vm::weakref_registry::id_of(&obj); - c_int::from(weavepy_vm::gc_trace::is_tracked(id)) + c_int::from(weavepy_vm::gc_trace::is_tracked(&obj)) } /// `PyObject_GC_Del(op)` — free a GC object's storage (a GC type's diff --git a/crates/weavepy-cli/weavepy.order b/crates/weavepy-cli/weavepy.order index 2d1622f8..a099563c 100644 --- a/crates/weavepy-cli/weavepy.order +++ 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Vec::with_capacity(code.varnames.len() + code.cellvars.len()); let mut kinds = Vec::with_capacity(names.capacity()); // `argvarkinds`: pos-only, pos-or-kw, kw-only, *args, **kwargs. @@ -1053,7 +1053,7 @@ pub fn encode(code: &CodeObject) -> CpythonCode { co_linetable: encode_linetable(code, &ext, &mapped, &zero_width, firstlineno), co_exceptiontable: encode_exception_table(code, &starts), co_code, - localsplusnames, + localsplusnames: localsplusnames.into_iter().map(String::from).collect(), localspluskinds, stacksize: code.stacksize.unwrap_or_else(|| compute_stacksize(code)), firstlineno, @@ -2061,7 +2061,7 @@ impl SlotMap { /// Build from a code object's variable lists (mirrors /// [`DerefSlots::from_code`], inverted). #[must_use] - pub fn from_code_vars(varnames: &[String], cellvars: &[String], freevars: &[String]) -> Self { + pub fn from_code_vars(varnames: &[S], cellvars: &[S], freevars: &[S]) -> Self { let nlocals = varnames.len() as u32; let mut nslots = varnames.len() + freevars.len(); for c in cellvars { @@ -2144,8 +2144,13 @@ fn decode_instructions( // A comprehension whose own target is a cell announces itself with // `MAKE_CELL s` right after the save and keeps closure semantics. // Nested comprehensions re-binding the same name push the slot - // again, so each restore pops one entry. + // again, so each restore pops one entry. The restore usually + // follows a `SWAP`, but the optimizer may move the result's store + // ahead of it (`POP_ITER; STORE_FAST result; STORE_FAST s`), so a + // store in the run of stores and swaps right after the loop's + // `END_FOR`/`POP_ITER` ends the region too. let mut plain_shared: Vec = Vec::new(); + let mut loop_tail = false; let shared_local = |slot: u32| slot < slots.nlocals && slots.is_cellish(slot); let end_region = |plain_shared: &mut Vec, slot: u32| { if let Some(p) = plain_shared.iter().rposition(|&s| s == slot) { @@ -2153,7 +2158,15 @@ fn decode_instructions( } }; for (idx, r) in raws.iter().enumerate() { - let after_swap = idx > 0 && raws[idx - 1].cp_op == op::SWAP; + let in_tail = loop_tail; + loop_tail = match r.cp_op { + op::END_FOR | op::POP_ITER => true, + op::SWAP | op::STORE_FAST | op::STORE_FAST_STORE_FAST | op::POP_TOP | op::NOP => { + loop_tail + } + _ => false, + }; + let after_swap = in_tail || (idx > 0 && raws[idx - 1].cp_op == op::SWAP); match r.cp_op { op::LOAD_FAST_AND_CLEAR if shared_local(r.arg) @@ -2800,7 +2813,7 @@ mod tests { ..CodeObject::default() }; // Give a couple of locals so LOAD_FAST vs LOAD_CLOSURE disambiguates. - c.varnames = vec!["a".to_owned(), "b".to_owned()]; + c.varnames = vec!["a".into(), "b".into()]; c } @@ -3097,9 +3110,9 @@ mod tests { linetable: vec![1, 2, 2, 3, 3, 4, 4].into(), ..CodeObject::default() }; - code.varnames = vec!["a".to_owned(), "b".to_owned()]; - code.cellvars = vec!["c".to_owned()]; - code.freevars = vec!["f".to_owned()]; + code.varnames = vec!["a".into(), "b".into()]; + code.cellvars = vec!["c".into()]; + code.freevars = vec!["f".into()]; code.exception_table.push(ExcHandler { start: 1, end: 4, @@ -3134,9 +3147,9 @@ mod tests { linetable: dc.linetable.into(), ..CodeObject::default() }; - code2.varnames = dc.varnames; - code2.cellvars = dc.cellvars; - code2.freevars = dc.freevars; + code2.varnames = dc.varnames.iter().map(crate::Name::from).collect(); + code2.cellvars = dc.cellvars.iter().map(crate::Name::from).collect(); + code2.freevars = dc.freevars.iter().map(crate::Name::from).collect(); code2.exception_table = dc.exception_table; let cp2 = encode(&code2); assert_eq!(cp2.co_code, cp.co_code); @@ -3302,7 +3315,7 @@ def f(): /// mapping pattern under-reported by one). #[test] fn stack_effects_agree_with_wire_shape() { - let slots = SlotMap::from_code_vars(&[], &[], &[]); + let slots = SlotMap::from_code_vars::(&[], &[], &[]); // Opcodes whose WeavePy arg is not the wire arg, or whose // fallthrough effect legitimately differs from the wire shape // (jumps take their real effect on the edge; FOR_ITER/END_FOR diff --git a/crates/weavepy-compiler/src/flowgraph.rs b/crates/weavepy-compiler/src/flowgraph.rs index a13d701d..19f9b458 100644 --- a/crates/weavepy-compiler/src/flowgraph.rs +++ b/crates/weavepy-compiler/src/flowgraph.rs @@ -398,19 +398,19 @@ fn is_unary_not(i: &CfgInstr) -> bool { pub(crate) struct BuildInput<'a> { /// Unconditional jumps CPython's codegen emits as the plain `JUMP` /// pseudo-op; every other one is `JUMP_NO_INTERRUPT`. - pub plain_jumps: &'a std::collections::HashSet, + pub plain_jumps: &'a crate::fxhash::HashSet, /// Unconditional jumps codegen flagged `JUMP_NO_INTERRUPT`. - pub no_interrupt_jumps: &'a std::collections::HashSet, + pub no_interrupt_jumps: &'a crate::fxhash::HashSet, /// `Nop`s standing in for a `SETUP_*` pseudo-op. - pub setup_nops: &'a std::collections::HashMap, + pub setup_nops: &'a crate::fxhash::HashMap, /// `Nop`s standing in for a `POP_BLOCK` pseudo-op. - pub popblock_nops: &'a std::collections::HashSet, + pub popblock_nops: &'a crate::fxhash::HashSet, /// Conditional jumps that, together with the `COPY 1; TO_BOOL` /// preceding them, stand for a `JUMP_IF_FALSE` / `JUMP_IF_TRUE` /// pseudo-op. - pub pseudo_cond_jumps: &'a std::collections::HashSet, + pub pseudo_cond_jumps: &'a crate::fxhash::HashSet, /// Conditional jumps whose `arg` is a *backward* distance. - pub backward_conds: &'a std::collections::HashSet, + pub backward_conds: &'a crate::fxhash::HashSet, /// The code unit carries the PEP 479 `SETUP_CLEANUP` wrap (its /// range is the last exception-table entry). pub stopiteration_wrap: bool, diff --git a/crates/weavepy-compiler/src/fxhash.rs b/crates/weavepy-compiler/src/fxhash.rs new file mode 100644 index 00000000..af93bcaf --- /dev/null +++ b/crates/weavepy-compiler/src/fxhash.rs @@ -0,0 +1,97 @@ +//! A fast, unkeyed hasher for the compiler's name sets and binding maps. +//! +//! Scope analysis builds many small sets of identifiers per code object. +//! The standard library's keyed SipHash costs several times more per short +//! string than this multiply-rotate hash (rustc's `FxHasher`), and the +//! compiler never hashes attacker-chosen keys at a scale where hash +//! flooding matters: a source's names are bounded by its own size. + +use std::hash::{BuildHasherDefault, Hasher}; + +/// rustc's `FxHasher`: one rotate, xor and multiply per word. +#[derive(Default, Clone, Copy)] +pub(crate) struct FxHasher { + hash: u64, +} + +const SEED: u64 = 0x51_7c_c1_b7_27_22_0a_95; + +impl FxHasher { + #[inline] + fn add(&mut self, word: u64) { + self.hash = (self.hash.rotate_left(5) ^ word).wrapping_mul(SEED); + } +} + +impl Hasher for FxHasher { + #[inline] + fn write(&mut self, mut bytes: &[u8]) { + while let Some((head, rest)) = bytes.split_first_chunk::<8>() { + self.add(u64::from_le_bytes(*head)); + bytes = rest; + } + if let Some((head, rest)) = bytes.split_first_chunk::<4>() { + self.add(u64::from(u32::from_le_bytes(*head))); + bytes = rest; + } + if let Some((head, rest)) = bytes.split_first_chunk::<2>() { + self.add(u64::from(u16::from_le_bytes(*head))); + bytes = rest; + } + if let Some(&b) = bytes.first() { + self.add(u64::from(b)); + } + } + + #[inline] + fn write_u8(&mut self, i: u8) { + self.add(u64::from(i)); + } + + #[inline] + fn write_u32(&mut self, i: u32) { + self.add(u64::from(i)); + } + + #[inline] + fn write_u64(&mut self, i: u64) { + self.add(i); + } + + #[inline] + fn write_usize(&mut self, i: usize) { + self.add(i as u64); + } + + #[inline] + fn finish(&self) -> u64 { + self.hash + } +} + +pub(crate) type FxBuild = BuildHasherDefault; + +/// A `HashSet` over [`FxHasher`]; build one with `HashSet::default()`. +pub(crate) type HashSet = std::collections::HashSet; + +/// Adding a borrowed name to a set of owned names, allocating only when +/// the name is new: scope scans see the same few names (`self`, the +/// parameters) over and over. +pub(crate) trait NameSet { + fn add_name(&mut self, name: &str); +} + +impl NameSet for HashSet { + #[inline] + fn add_name(&mut self, name: &str) { + if !self.contains(name) { + self.insert(name.to_owned()); + } + } +} + +/// A `HashMap` over [`FxHasher`]; build one with `HashMap::default()`. +pub(crate) type HashMap = std::collections::HashMap; + +/// An `IndexMap` over [`FxHasher`]; build one with `IndexMap::default()`. +pub(crate) type IndexMap = indexmap::IndexMap; diff --git a/crates/weavepy-compiler/src/intern.rs b/crates/weavepy-compiler/src/intern.rs index 02d40507..c6750fa1 100644 --- a/crates/weavepy-compiler/src/intern.rs +++ b/crates/weavepy-compiler/src/intern.rs @@ -42,7 +42,7 @@ impl InternIndex { i } - pub(crate) fn intern_name(&mut self, values: &mut Vec, name: &str) -> u32 { + pub(crate) fn intern_name(&mut self, values: &mut Vec, name: &str) -> u32 { if values.len() < 32 { if let Some(i) = values.iter().position(|v| v == name) { return i as u32; @@ -55,7 +55,7 @@ impl InternIndex { self.next.push(self.heads.insert(key, values.len() as u32)); } let i = values.len() as u32; - values.push(name.to_owned()); + values.push(crate::Name::new(name)); i } diff --git a/crates/weavepy-compiler/src/lib.rs b/crates/weavepy-compiler/src/lib.rs index 48003585..3d839c1a 100644 --- a/crates/weavepy-compiler/src/lib.rs +++ b/crates/weavepy-compiler/src/lib.rs @@ -20,12 +20,12 @@ //! peephole optimizer and adaptive specialization produce different //! shapes that we deliberately don't reproduce. +use fxhash::{HashSet, NameSet}; use std::borrow::Cow; -use std::collections::HashSet; use std::rc::Rc; use bytecode::intrinsic; -use indexmap::IndexMap; +use fxhash::IndexMap; use thiserror::Error; use weavepy_parser::ast::{ Arguments as AstArguments, BinOp, BoolOp, CmpOp, Comprehension, Constant as AstConstant, @@ -38,8 +38,10 @@ pub mod bytecode; mod cache_snapshot; pub mod cpython_code; mod flowgraph; +mod fxhash; mod intern; mod mangle; +mod name; pub mod native_code; mod validate; @@ -50,6 +52,7 @@ pub use bytecode::{ COMPARE_OP_TO_BOOL_FLAG, COOLDOWN, SPECIAL_AENTER, SPECIAL_AEXIT, SPECIAL_ENTER, SPECIAL_EXIT, }; pub use cpython_code::{CpythonCode, Position}; +pub use name::Name; /// CPython compile.c `STACK_USE_GUIDELINE`: literal displays and call /// sites with more operands than this compile through accumulator @@ -145,6 +148,11 @@ pub use weavepy_parser::ast::expr_name; // ---------- code object ---------- +/// Whether `names` holds `name`. +fn has_name(names: &[Name], name: &str) -> bool { + names.iter().any(|n| n.as_str() == name) +} + /// RFC 0061 (WS2a): an opaque, VM-owned per-code-object extension slot. /// /// The VM stashes derived, execution-only state here (today: the @@ -158,20 +166,27 @@ pub use weavepy_parser::ast::expr_name; /// cloned code object starts with an empty slot), never participates in /// equality, and is not serialized. /// -/// The slot holds the payload's address (the VM's hot accessor reads one -/// thin pointer) and the function that drops it, two words in all. +/// The slot is one word: the address of the payload, which starts with +/// the function that drops it (the VM's hot accessor reads one thin +/// pointer). #[derive(Default)] pub struct VmExt { - /// The payload, a leaked `Box`, or null. + /// The payload, a leaked `Box>`, or null. payload: std::sync::atomic::AtomicPtr<()>, - /// The payload's `drop_payload` instance, stored once `payload` is. - drop: std::sync::atomic::AtomicPtr<()>, +} + +/// A [`VmExt`] payload: the value, after the function that drops the box. +#[repr(C)] +struct Payload { + drop: fn(*mut ()), + value: T, } /// Drop a [`VmExt`] payload of type `T`. fn drop_payload(payload: *mut ()) { - // SAFETY: `payload` is the `Box` `VmExt::get_or_init` leaked. - drop(unsafe { Box::from_raw(payload.cast::()) }); + // SAFETY: `payload` is the `Box>` `VmExt::get_or_init` + // leaked. + drop(unsafe { Box::from_raw(payload.cast::>()) }); } impl VmExt { @@ -183,9 +198,9 @@ impl VmExt { #[inline] pub unsafe fn get(&self) -> Option<&T> { let p = self.payload.load(std::sync::atomic::Ordering::Acquire); - // SAFETY: a non-null payload is a live `T` (the caller's contract) - // that lives as long as the slot. - (!p.is_null()).then(|| unsafe { &*p.cast::() }) + // SAFETY: a non-null payload is a live `Payload` (the caller's + // contract) that lives as long as the slot. + (!p.is_null()).then(|| unsafe { &(*p.cast::>()).value }) } /// The payload, set from `init` if there is none yet. Racing @@ -200,26 +215,23 @@ impl VmExt { if let Some(payload) = unsafe { self.get::() } { return payload; } - let fresh = Box::into_raw(Box::new(init())).cast::<()>(); + let fresh = Box::into_raw(Box::new(Payload { + drop: drop_payload::, + value: init(), + })) + .cast::<()>(); match self.payload.compare_exchange( std::ptr::null_mut(), fresh, Ordering::AcqRel, Ordering::Acquire, ) { - Ok(_) => { - // Read only by `drop`, which has the slot to itself. - self.drop.store( - drop_payload:: as fn(*mut ()) as *mut (), - Ordering::Release, - ); - // SAFETY: just published; it lives as long as the slot. - unsafe { &*fresh.cast::() } - } + // SAFETY: just published; it lives as long as the slot. + Ok(_) => unsafe { &(*fresh.cast::>()).value }, Err(won) => { drop_payload::(fresh); - // SAFETY: the winner's `T` (the caller's contract). - unsafe { &*won.cast::() } + // SAFETY: the winner's `Payload` (the caller's contract). + unsafe { &(*won.cast::>()).value } } } } @@ -235,11 +247,11 @@ impl VmExt { impl Drop for VmExt { fn drop(&mut self) { - let (payload, drop_fn) = (*self.payload.get_mut(), *self.drop.get_mut()); - if !payload.is_null() && !drop_fn.is_null() { - // SAFETY: `drop_fn` was stored from a `fn(*mut ())` for this - // payload's type. - let drop_fn = unsafe { std::mem::transmute::<*mut (), fn(*mut ())>(drop_fn) }; + let payload = *self.payload.get_mut(); + if !payload.is_null() { + // SAFETY: every payload starts with its own drop function + // (`Payload` is `repr(C)`). + let drop_fn = unsafe { *payload.cast::() }; drop_fn(payload); } } @@ -574,13 +586,13 @@ impl std::fmt::Debug for JitHint { /// `PyCodeObject` we need to emulate. #[derive(Debug, Clone, Default, PartialEq)] pub struct CodeObject { - pub name: String, + pub name: Name, /// Dotted qualified name (PEP 3155), computed at compile time from the /// lexical scope nesting: `outer..inner` for a function nested /// in `outer`, `C.method` for a method of class `C`. Equals `name` for /// module-level definitions. Drives `function.__qualname__` / /// `type.__qualname__` (and thus reprs, error messages, and pickling). - pub qualname: String, + pub qualname: Name, /// Source filename or ``. Used for diagnostics only. Shared: /// every code object compiled or decoded from one module holds the /// same allocation. @@ -597,13 +609,14 @@ pub struct CodeObject { pub jit_hint: JitHint, pub constants: Vec, /// Names referenced by `LOAD_NAME` / `LOAD_GLOBAL` / `STORE_NAME` etc. - pub names: Vec, + /// These and the other name tables hold pooled [`Name`]s. + pub names: Vec, /// Local variable names (positional + keyword + `*args`/`**kwargs` + locals). - pub varnames: Vec, + pub varnames: Vec, /// Free variables — read from an enclosing scope. - pub freevars: Vec, + pub freevars: Vec, /// Cell variables — locally defined but referenced by an inner scope. - pub cellvars: Vec, + pub cellvars: Vec, /// Out-of-line exception handlers. Looked up by current PC when a /// `RuntimeError::PyException` propagates through this code object. pub exception_table: Vec, @@ -776,10 +789,10 @@ impl PartialEq for CodeRare { } // A decoded module holds a code object per function, class body and -// comprehension, each behind an `Arc`'s two counts: at 432 bytes or -// fewer, the allocation fits mimalloc's 448-byte size class. +// comprehension, each behind an `Arc`'s two counts: at 368 bytes or +// fewer, the allocation fits mimalloc's 384-byte size class. #[cfg(target_pointer_width = "64")] -const _: () = assert!(std::mem::size_of::() <= 432); +const _: () = assert!(std::mem::size_of::() <= 368); impl CodeObject { /// See [`RareFields::no_interrupt_jumps`]. @@ -814,49 +827,218 @@ pub struct WireOverrides { pub exec_error: Option, } -/// A per-instruction source-column span (PEP-657). `col`/`end_col` are -/// 0-based UTF-8 byte offsets within their respective source lines, and +/// A table decoded on first read from the code cache's encoding of it +/// (see `native_code`), or a vector: the state behind [`LineTable`], +/// [`ColTable`] and [`WireMarks`]. +/// +/// Two words: the encoding's range of the buffer every code object of a +/// module shares, and one word of state. State `0` is an empty table not +/// yet materialized; an address with [`LAZY_ENCODED`] set is the shared +/// buffer's `Arc` (one count), still encoded; any other address is the +/// decoded table, which takes over that count. (It keeps the buffer +/// alive while a racing reader may still decode from it, until the table +/// is dropped or borrowed mutably.) +struct LazyTable { + state: std::sync::atomic::AtomicUsize, + start: u32, + end: u32, + _items: std::marker::PhantomData>, +} + +/// The table section of a module in the code cache's native form (see +/// `native_code`): its own bytes, or, say, a mapping of the cache file +/// that only the tables something reads ever page in. +pub struct TableBuffer(Box + Send + Sync>); + +impl TableBuffer { + pub fn new(bytes: impl AsRef<[u8]> + Send + Sync + 'static) -> Self { + TableBuffer(Box::new(bytes)) + } + + fn bytes(&self) -> &[u8] { + (*self.0).as_ref() + } +} + +impl std::fmt::Debug for TableBuffer { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + write!(f, "TableBuffer({} bytes)", self.bytes().len()) + } +} + +/// The tag of an encoded [`LazyTable`]'s state. +const LAZY_ENCODED: usize = 1; + +/// A decoded [`LazyTable`]. +struct Decoded { + items: Vec, + /// The buffer the table was decoded from, if any. + source: Option>, +} + +// SAFETY: the state is either nothing, an `Arc` of a shareable buffer, or +// an owned `Box>` published through the atomic. +unsafe impl Send for LazyTable {} +unsafe impl Sync for LazyTable {} + +impl LazyTable { + fn new(state: usize, start: u32, end: u32) -> Self { + LazyTable { + state: std::sync::atomic::AtomicUsize::new(state), + start, + end, + _items: std::marker::PhantomData, + } + } + + fn from_vec(items: Vec) -> Self { + let decoded = Box::new(Decoded { + items, + source: None, + }); + Self::new(Box::into_raw(decoded) as usize, 0, 0) + } + + fn encoded(encoded: Encoded) -> Self { + let Encoded { buffer, start, end } = encoded; + Self::new( + std::sync::Arc::into_raw(buffer) as usize | LAZY_ENCODED, + start, + end, + ) + } + + /// The table, decoded with `decode` (or empty when that fails) if + /// this is its first read. + #[inline] + fn get(&self, decode: fn(&[u8]) -> Option>) -> &Vec { + use std::sync::atomic::Ordering; + let state = self.state.load(Ordering::Acquire); + if state != 0 && state & LAZY_ENCODED == 0 { + // SAFETY: a decoded table lives as long as `self`. + return unsafe { &(*(state as *const Decoded)).items }; + } + self.decode(state, decode) + } + + #[cold] + #[inline(never)] + fn decode(&self, state: usize, decode: fn(&[u8]) -> Option>) -> &Vec { + use std::sync::atomic::Ordering; + let buffer = (state & !LAZY_ENCODED) as *const TableBuffer; + let (items, source) = if buffer.is_null() { + (Vec::new(), None) + } else { + // SAFETY: the state holds a count of this `Arc`, which the + // decoded table takes over if it is published (and which a + // published table keeps alive for any racing reader). + let source = unsafe { std::sync::Arc::from_raw(buffer) }; + let items = source + .bytes() + .get(self.start as usize..self.end as usize) + .and_then(decode) + .unwrap_or_default(); + (items, Some(source)) + }; + let fresh = Box::into_raw(Box::new(Decoded { items, source })); + match self.state.compare_exchange( + state, + fresh as usize, + Ordering::AcqRel, + Ordering::Acquire, + ) { + // SAFETY: just published; it lives as long as `self`. + Ok(_) => unsafe { &(*fresh).items }, + Err(won) => { + // SAFETY: never published; the count it holds is the + // state's, which the winner took over. + let lost = unsafe { Box::from_raw(fresh) }; + if let Some(source) = lost.source { + let _ = std::sync::Arc::into_raw(source); + } + // SAFETY: the winner's decoded table lives as long as + // `self`. + unsafe { &(*(won as *const Decoded)).items } + } + } + } + + fn get_mut(&mut self, decode: fn(&[u8]) -> Option>) -> &mut Vec { + self.get(decode); + let state = *self.state.get_mut(); + // SAFETY: `get` left a decoded table, and the exclusive borrow + // means no reader can still be decoding from its source. + let decoded = unsafe { &mut *(state as *mut Decoded) }; + decoded.source = None; + &mut decoded.items + } +} + +impl Drop for LazyTable { + fn drop(&mut self) { + let state = *self.state.get_mut(); + if state == 0 { + return; + } + // SAFETY: the state owns what it points at (see the type docs). + unsafe { + if state & LAZY_ENCODED != 0 { + drop(std::sync::Arc::from_raw( + (state & !LAZY_ENCODED) as *const TableBuffer, + )); + } else { + drop(Box::from_raw(state as *mut Decoded)); + } + } + } +} + +impl Default for LazyTable { + fn default() -> Self { + Self::new(0, 0, 0) + } +} + +impl Clone for LazyTable { + fn clone(&self) -> Self { + let state = self.state.load(std::sync::atomic::Ordering::Acquire); + if state == 0 { + Self::default() + } else if state & LAZY_ENCODED != 0 { + // SAFETY: the state holds a count of this `Arc`; the clone + // takes another. + unsafe { + std::sync::Arc::increment_strong_count( + (state & !LAZY_ENCODED) as *const TableBuffer, + ); + } + Self::new(state, self.start, self.end) + } else { + // SAFETY: a decoded table lives as long as `self`. + Self::from_vec(unsafe { &(*(state as *const Decoded)).items }.clone()) + } + } +} + /// A code object's column spans (see [`CodeObject::coltable`]): a /// vector, or the code cache's encoding of one, decoded on first use. /// Most code never reports a column (only tracebacks and /// `co_positions()` read them), so a module loaded from the cache skips /// the work until something does. #[derive(Clone, Default)] -pub struct ColTable { - // Boxed so that the (usual) undecoded table costs one word here. - #[allow(clippy::box_collection)] - spans: std::sync::OnceLock>>, - encoded: Option, -} +pub struct ColTable(LazyTable); impl ColTable { /// The spans `encoded` holds in the code cache's form (see /// `native_code`), decoded when first read. pub(crate) fn encoded(encoded: Encoded) -> Self { - ColTable { - spans: std::sync::OnceLock::new(), - encoded: Some(encoded), - } - } - - fn spans(&self) -> &Vec { - self.spans.get_or_init(|| { - Box::new( - self.encoded - .as_ref() - .and_then(|e| native_code::decode_coltable(e.bytes())) - .unwrap_or_default(), - ) - }) + ColTable(LazyTable::encoded(encoded)) } } impl From> for ColTable { fn from(spans: Vec) -> Self { - ColTable { - spans: std::sync::OnceLock::from(Box::new(spans)), - encoded: None, - } + ColTable(LazyTable::from_vec(spans)) } } @@ -864,15 +1046,13 @@ impl std::ops::Deref for ColTable { type Target = Vec; fn deref(&self) -> &Vec { - self.spans() + self.0.get(native_code::decode_coltable) } } impl std::ops::DerefMut for ColTable { fn deref_mut(&mut self) -> &mut Vec { - self.spans(); - self.encoded = None; - self.spans.get_mut().expect("decoded above") + self.0.get_mut(native_code::decode_coltable) } } @@ -895,32 +1075,13 @@ impl std::fmt::Debug for ColTable { /// a module loaded from the cache keeps the compact form until something /// does, instead of four bytes per instruction. #[derive(Clone, Default)] -pub struct LineTable { - // Boxed so that the (usual) undecoded table costs one word here. - #[allow(clippy::box_collection)] - lines: std::sync::OnceLock>>, - encoded: Option, -} +pub struct LineTable(LazyTable); impl LineTable { /// The lines `encoded` holds in the code cache's form (see /// `native_code`), decoded when first read. pub(crate) fn encoded(encoded: Encoded) -> Self { - LineTable { - lines: std::sync::OnceLock::new(), - encoded: Some(encoded), - } - } - - fn lines(&self) -> &Vec { - self.lines.get_or_init(|| { - Box::new( - self.encoded - .as_ref() - .and_then(|e| native_code::decode_linetable(e.bytes())) - .unwrap_or_default(), - ) - }) + LineTable(LazyTable::encoded(encoded)) } } @@ -928,28 +1089,19 @@ impl LineTable { /// encoding: a range of a buffer that every code object decoded from one /// module shares (see `native_code::decode`), so a module's tables take /// one allocation rather than three per code object. -#[derive(Clone)] pub(crate) struct Encoded { - /// Set once the module's decoding finishes, before any table is read. - buffer: std::sync::Arc>>, + buffer: std::sync::Arc, start: u32, end: u32, } impl Encoded { - pub(crate) fn new( - buffer: std::sync::Arc>>, - start: u32, - end: u32, - ) -> Self { + pub(crate) fn new(buffer: std::sync::Arc, start: u32, end: u32) -> Self { Encoded { buffer, start, end } } - fn bytes(&self) -> &[u8] { - self.buffer - .get() - .and_then(|b| b.get(self.start as usize..self.end as usize)) - .unwrap_or_default() + pub(crate) fn is_empty(&self) -> bool { + self.start == self.end } } @@ -957,30 +1109,19 @@ impl Encoded { /// or the code cache's encoding of one (two marks a byte), decoded on /// first use. Only the CPython wire form of the code reads them. #[derive(Clone, Default)] -pub struct WireMarks { - // Boxed so that the (usual) undecoded marks cost one word here. - #[allow(clippy::box_collection)] - marks: std::sync::OnceLock>>, - encoded: Option, -} +pub struct WireMarks(LazyTable); impl WireMarks { /// The marks `encoded` holds in the code cache's form (see /// `native_code`), decoded when first read. pub(crate) fn encoded(encoded: Encoded) -> Self { - WireMarks { - marks: std::sync::OnceLock::new(), - encoded: Some(encoded), - } + WireMarks(LazyTable::encoded(encoded)) } } impl From> for WireMarks { fn from(marks: Vec) -> Self { - WireMarks { - marks: std::sync::OnceLock::from(Box::new(marks)), - encoded: None, - } + WireMarks(LazyTable::from_vec(marks)) } } @@ -988,14 +1129,7 @@ impl std::ops::Deref for WireMarks { type Target = [u8]; fn deref(&self) -> &[u8] { - self.marks.get_or_init(|| { - Box::new( - self.encoded - .as_ref() - .and_then(|e| native_code::decode_wire_marks(e.bytes())) - .unwrap_or_default(), - ) - }) + self.0.get(native_code::decode_wire_marks) } } @@ -1013,10 +1147,7 @@ impl std::fmt::Debug for WireMarks { impl From> for LineTable { fn from(lines: Vec) -> Self { - LineTable { - lines: std::sync::OnceLock::from(Box::new(lines)), - encoded: None, - } + LineTable(LazyTable::from_vec(lines)) } } @@ -1024,15 +1155,13 @@ impl std::ops::Deref for LineTable { type Target = Vec; fn deref(&self) -> &Vec { - self.lines() + self.0.get(native_code::decode_linetable) } } impl std::ops::DerefMut for LineTable { fn deref_mut(&mut self) -> &mut Vec { - self.lines(); - self.encoded = None; - self.lines.get_mut().expect("decoded above") + self.0.get_mut(native_code::decode_linetable) } } @@ -1048,6 +1177,8 @@ impl std::fmt::Debug for LineTable { } } +/// A per-instruction source-column span (PEP-657). `col`/`end_col` are +/// 0-based UTF-8 byte offsets within their respective source lines, and /// are `-1` when the column was not tracked. `end_lineno` is `0` when /// unknown (callers fall back to the instruction's start line). #[derive(Debug, Clone, Copy, PartialEq, Eq)] @@ -1226,7 +1357,7 @@ impl CodeObject { } } OpCode::LoadDeref | OpCode::StoreDeref | OpCode::LoadClosure => { - let combined: Vec<&String> = + let combined: Vec<&Name> = self.cellvars.iter().chain(self.freevars.iter()).collect(); if let Some(n) = combined.get(ins.arg as usize) { out.push('('); @@ -1620,12 +1751,12 @@ fn collect_module_imports(body: &[Stmt]) -> HashSet { for a in aliases { match &a.asname { Some(n) => { - out.insert(n.clone()); + out.add_name(n); } // `import a.b.c` binds the first segment. None => { let first = a.name.split('.').next().unwrap_or(&a.name); - out.insert(first.to_owned()); + out.add_name(first); } } } @@ -1668,7 +1799,7 @@ fn collect_module_imports(body: &[Stmt]) -> HashSet { } } } - let mut out = HashSet::new(); + let mut out = HashSet::default(); walk(body, &mut out); out } @@ -2317,7 +2448,7 @@ struct Compiler { /// `Nop`s standing in for a located `SETUP_*` pseudo-op (the `try:` /// line's NOP is really `SETUP_FINALLY`). The flowgraph keeps them /// as block-push instructions until `convert_pseudo_ops`. - setup_nops: std::collections::HashMap, + setup_nops: fxhash::HashMap, /// Suppress-path exit jumps parked by /// [`Self::emit_with_except_finish`] for its caller to patch. with_exit_jumps: Vec, @@ -2678,6 +2809,7 @@ impl Compiler { let mut co = CodeObject::default(); // Default qualname == name; nested scopes overwrite this via // `compute_child_qualname` once the parent context is known. + let name = Name::from(name); co.qualname = name.clone(); co.name = name; co.filename = filename; @@ -2689,10 +2821,10 @@ impl Compiler { name_index: intern::InternIndex::default(), kind, comp_kind: None, - bindings: IndexMap::new(), - explicit_globals: HashSet::new(), - comp_cell_only: HashSet::new(), - class_transparent_frees: HashSet::new(), + bindings: IndexMap::default(), + explicit_globals: HashSet::default(), + comp_cell_only: HashSet::default(), + class_transparent_frees: HashSet::default(), free_order: Vec::new(), loop_stack: Vec::new(), finally_stack: Vec::new(), @@ -2703,13 +2835,13 @@ impl Compiler { line_pinned: None, pinned_colspan: ColSpan::default(), current_span: (0, 0), - no_interrupt_jumps: HashSet::new(), - plain_jumps: HashSet::new(), - setup_nops: std::collections::HashMap::new(), + no_interrupt_jumps: HashSet::default(), + plain_jumps: HashSet::default(), + setup_nops: fxhash::HashMap::default(), with_exit_jumps: Vec::new(), - popblock_nops: HashSet::new(), - pseudo_cond_jumps: HashSet::new(), - backward_conds: HashSet::new(), + popblock_nops: HashSet::default(), + pseudo_cond_jumps: HashSet::default(), + backward_conds: HashSet::default(), stopiteration_wrap: true, inline_comp: 0, module_comp_plain_targets: Vec::new(), @@ -2733,7 +2865,7 @@ impl Compiler { pep695_defaults: None, lazy_class_ctx: None, pending_lazy_class_ctx: None, - class_assigned: HashSet::new(), + class_assigned: HashSet::default(), deferred_annotations: Vec::new(), next_cond_annotation_index: 0, in_conditional_block: 0, @@ -2828,7 +2960,7 @@ impl Compiler { if force_global && self.explicit_globals.contains(name) { return name.to_owned(); } - let mut base = self.co.qualname.clone(); + let mut base = self.co.qualname.to_string(); if matches!(self.kind, CodeKind::Function) { base.push_str("."); } @@ -2847,7 +2979,7 @@ impl Compiler { if matches!(self.kind, CodeKind::Module) { return String::new(); } - let mut base = self.co.qualname.clone(); + let mut base = self.co.qualname.to_string(); if matches!(self.kind, CodeKind::Function) && self.annotation_qualname.is_none() { base.push_str("."); } @@ -2865,10 +2997,10 @@ impl Compiler { // cell index. Keeping the internal order equal to slot order // makes the RFC 0068 wire codec's deref mapping invertible. if self.co.cellvars.len() > 1 { - let mut sorted: Vec = self.co.cellvars.clone(); + let mut sorted: Vec = self.co.cellvars.clone(); sorted.sort_unstable_by_key(|c| match self.co.varnames.iter().position(|v| v == c) { Some(p) => (0usize, p, String::new()), - None => (1usize, 0, c.clone()), + None => (1usize, 0, c.to_string()), }); if sorted != self.co.cellvars { let remap: Vec = self @@ -2928,7 +3060,7 @@ impl Compiler { self.free_order = sorted; } } - self.co.freevars = self.free_order.clone(); + self.co.freevars = self.free_order.iter().map(Name::from).collect(); // `codegen_wrap_in_stopiteration_handler` (PEP 479): the // generator-family body ends in an explicit `return None`, and @@ -3559,7 +3691,7 @@ impl Compiler { if has_annotations { self.co .cellvars - .push("__conditional_annotations__".to_owned()); + .push(Name::from("__conditional_annotations__")); if let Some(loc) = module_loc { self.apply_annotate_loc(loc); } @@ -3621,7 +3753,7 @@ impl Compiler { fn analyze_scope_module(&mut self, module: &Module) { // At module scope every assigned name is a global (CPython // does the same — locals at module scope ARE the globals). - let mut assigned = HashSet::new(); + let mut assigned = HashSet::default(); for s in &module.body { collect_assigned(s, &mut assigned); collect_walrus_stmt(s, &mut assigned); @@ -3635,7 +3767,7 @@ impl Compiler { // accesses compile to the *_GLOBAL opcodes instead of *_NAME. // Observable when `exec` runs with distinct globals/locals // mappings (test_scope.testGlobalInParallelNestedFunctions). - let mut explicit = HashSet::new(); + let mut explicit = HashSet::default(); for s in &module.body { collect_global_decls_deep(s, &mut explicit); } @@ -3655,7 +3787,7 @@ impl Compiler { } } self.explicit_globals = explicit; - let mut comp_cells = HashSet::new(); + let mut comp_cells = HashSet::default(); for s in &module.body { self.collect_comp_cells_stmt(s, &mut comp_cells); } @@ -3698,7 +3830,7 @@ impl Compiler { collect: impl Fn(&FreeScan, &mut HashSet), ) -> HashSet { let scan = self.free_scan(inline_comps); - let mut needed = HashSet::new(); + let mut needed = HashSet::default(); collect(&scan, &mut needed); needed } @@ -3731,10 +3863,10 @@ impl Compiler { _ => {} } } - let mut all: Vec = self.co.cellvars.clone(); + let mut all: Vec = self.co.cellvars.clone(); for name in comp_cells { - if !all.contains(&name) { - all.push(name); + if !all.iter().any(|c| *c == name) { + all.push(Name::from(name)); } } all.sort_unstable(); @@ -3750,9 +3882,9 @@ impl Compiler { for p in params { self.bindings.insert(p.clone(), Binding::Local); } - let mut globals = HashSet::new(); - let mut nonlocals = HashSet::new(); - let mut assigned = HashSet::new(); + let mut globals = HashSet::default(); + let mut nonlocals = HashSet::default(); + let mut assigned = HashSet::default(); for s in body { collect_decls(s, &mut globals, &mut nonlocals, &mut assigned); // Walrus targets bind in this scope too (PEP 572) but live inside @@ -3782,7 +3914,7 @@ impl Compiler { self.bindings.entry(n).or_insert(Binding::Local); } // Names referenced by directly-emitted bytecode in this scope. - let mut reads = HashSet::new(); + let mut reads = HashSet::default(); for s in body { collect_reads_stmt_fn(s, &mut reads); } @@ -3846,13 +3978,13 @@ impl Compiler { for name in needed_in_inner { if matches!(self.bindings.get(&name), Some(Binding::Local)) { self.bindings.insert(name.clone(), Binding::Cell); - if !self.co.cellvars.contains(&name) { - self.co.cellvars.push(name); + if !has_name(&self.co.cellvars, &name) { + self.co.cellvars.push(Name::from(name)); } } } if self.lazy_class_ctx.is_none() { - let mut comp_cells = HashSet::new(); + let mut comp_cells = HashSet::default(); for s in body { self.collect_comp_cells_stmt(s, &mut comp_cells); } @@ -3862,7 +3994,7 @@ impl Compiler { // (`return b` next to `[(lambda: b) for b in xs]` is a // LOAD_GLOBAL, test_listcomps // `test_global_outside_cellvar_inside_plus_freevar`). - let mut used = HashSet::new(); + let mut used = HashSet::default(); for s in body { for_each_scope_expr(s, &mut |e| { self.collect_uses_through_inlined(e, &mut Vec::new(), &mut used) @@ -3870,7 +4002,7 @@ impl Compiler { } for name in &comp_cells { if used.contains(name) && !self.bindings.contains_key(name) { - self.comp_cell_only.insert(name.clone()); + self.comp_cell_only.add_name(name); } } self.register_comp_cells(comp_cells); @@ -5482,7 +5614,7 @@ impl Compiler { // A class's own type parameters (and the header expressions // that mention them) mangle against the class's name. let mut type_params = type_params.clone(); - let mut own_params: HashSet = HashSet::new(); + let mut own_params: HashSet = HashSet::default(); let mangle_header = is_class && !display.trim_start_matches('_').is_empty(); if mangle_header { // Source spellings: `mangle_only_in_expr` renames exactly @@ -5767,9 +5899,9 @@ impl Compiler { .insert("__classdict__".to_owned(), Binding::Free); inner.free_order.push("__classdict__".to_owned()); } - inner.co.qualname = self.compute_child_qualname(hidden_name); + inner.co.qualname = Name::unpooled(&self.compute_child_qualname(hidden_name)); inner.co.arg_count = arg_count; - inner.co.varnames = hidden_params.to_vec(); + inner.co.varnames = hidden_params.iter().map(Name::from).collect(); inner.current_line = entry_line.unwrap_or(self.current_line); if class_scope { // `.type_params` is read by the class body (always a cell, @@ -5778,7 +5910,10 @@ impl Compiler { inner .bindings .insert(".type_params".to_owned(), Binding::Cell); - inner.co.cellvars.push(".type_params".to_owned()); + inner + .co + .cellvars + .push(Name::from(".type_params".to_owned())); inner .bindings .insert(".generic_base".to_owned(), Binding::Local); @@ -5787,8 +5922,8 @@ impl Compiler { for free in &inner.free_order { if matches!(self.bindings.get(free), Some(Binding::Local)) { self.bindings.insert(free.clone(), Binding::Cell); - if !self.co.cellvars.contains(free) { - self.co.cellvars.push(free.clone()); + if !has_name(&self.co.cellvars, free) { + self.co.cellvars.push(Name::from(free.clone())); } } } @@ -6248,13 +6383,13 @@ impl Compiler { .insert("__classdict__".to_owned(), Binding::Free); inner.free_order.push("__classdict__".to_owned()); } - inner.co.qualname = self.compute_child_qualname(display); + inner.co.qualname = Name::unpooled(&self.compute_child_qualname(display)); inner.co.arg_count = arg_count; inner.co.posonly_count = posonly_count; inner.co.kwonly_count = kwonly_count; inner.co.has_varargs = args.vararg.is_some(); inner.co.has_varkeywords = args.kwarg.is_some(); - inner.co.varnames = param_names.clone(); + inner.co.varnames = param_names.iter().map(Name::from).collect(); inner.current_line = entry_line.unwrap_or(self.current_line); // Methods compiled inside a class body get an implicit // `__class__` free variable so `super()` (and explicit @@ -6287,9 +6422,9 @@ impl Compiler { // never satisfies a nonlocal, and a class-body Local is a class // attribute, not a nonlocal binding target. { - let mut ng = HashSet::new(); - let mut nl = HashSet::new(); - let mut na = HashSet::new(); + let mut ng = HashSet::default(); + let mut nl = HashSet::default(); + let mut na = HashSet::default(); for s in body { collect_decls(s, &mut ng, &mut nl, &mut na); } @@ -6347,8 +6482,8 @@ impl Compiler { for free in &inner.free_order { if matches!(self.bindings.get(free), Some(Binding::Local)) { self.bindings.insert(free.clone(), Binding::Cell); - if !self.co.cellvars.contains(free) { - self.co.cellvars.push(free.clone()); + if !has_name(&self.co.cellvars, free) { + self.co.cellvars.push(Name::from(free.clone())); } } } @@ -6504,7 +6639,7 @@ impl Compiler { .insert("__classdict__".to_owned(), Binding::Free); inner.free_order.push("__classdict__".to_owned()); } - inner.co.qualname = self.compute_annotation_child_qualname(name); + inner.co.qualname = Name::unpooled(&self.compute_annotation_child_qualname(name)); // A lambda or comprehension inside the annotation scope is // named from *this* scope (`compiler_set_qualname` looks // through the annotation parent). @@ -6512,14 +6647,14 @@ impl Compiler { Some((String::new(), String::new(), self.annotation_child_prefix())); inner.co.arg_count = 1; inner.co.posonly_count = 1; - inner.co.varnames = vec![FORMAT_PARAM.to_owned()]; + inner.co.varnames = vec![Name::from(FORMAT_PARAM)]; inner.current_line = loc.line; inner.analyze_scope_function(&[FORMAT_PARAM.to_owned()], analysis_body, &[&self.bindings]); for free in &inner.free_order { if matches!(self.bindings.get(free), Some(Binding::Local)) { self.bindings.insert(free.clone(), Binding::Cell); - if !self.co.cellvars.contains(free) { - self.co.cellvars.push(free.clone()); + if !has_name(&self.co.cellvars, free) { + self.co.cellvars.push(Name::from(free.clone())); } } } @@ -6551,7 +6686,7 @@ impl Compiler { let mut code = inner.finish(); // `co->co_localsplusnames = ("format", *co->co_localsplusnames[1:])` if is_annotate { - code.varnames[0] = "format".to_owned(); + code.varnames[0] = Name::from("format"); code.annotate_scope = true; } Ok(code) @@ -6988,7 +7123,7 @@ impl Compiler { // A class body never reports `CO_NESTED` itself (no // `CO_OPTIMIZED`), but its methods inherit the nesting. inner.co.is_nested = self.child_is_nested(); - inner.co.qualname = self.compute_child_qualname(name); + inner.co.qualname = Name::unpooled(&self.compute_child_qualname(name)); inner.current_line = entry_line.unwrap_or(self.current_line); // CPython only gives a class body the `__class__` closure cell — // and the trailing `__classcell__` store — when a method actually @@ -7010,7 +7145,7 @@ impl Compiler { class_body: false, class_binds: None, }; - let mut needed = HashSet::new(); + let mut needed = HashSet::default(); for s in body { collect_inner_free(s, &self.bindings, &mut needed, &scan); } @@ -7037,7 +7172,7 @@ impl Compiler { || class_body_defs_claim_class_cell(body) }; if needs_class_closure { - inner.co.cellvars.push("__class__".to_owned()); + inner.co.cellvars.push(Name::from("__class__".to_owned())); inner.bindings.insert("__class__".to_owned(), Binding::Cell); } // PEP 695 (RFC 0051): annotation scopes created in this class @@ -7053,7 +7188,10 @@ impl Compiler { .any(|s| stmt_needs_classdict(s, future_annotations)) || needed.contains("__classdict__"); if needs_classdict { - inner.co.cellvars.push("__classdict__".to_owned()); + inner + .co + .cellvars + .push(Name::from("__classdict__".to_owned())); inner .bindings .insert("__classdict__".to_owned(), Binding::Cell); @@ -7069,13 +7207,13 @@ impl Compiler { inner .co .cellvars - .push("__conditional_annotations__".to_owned()); + .push(Name::from("__conditional_annotations__")); inner .bindings .insert("__conditional_annotations__".to_owned(), Binding::Cell); } - let mut assigned = HashSet::new(); + let mut assigned = HashSet::default(); for s in body { collect_assigned(s, &mut assigned); } @@ -7089,9 +7227,9 @@ impl Compiler { // nested `def X`/`class X` gets a bare qualname (see // `compute_child_qualname`). { - let mut globals = HashSet::new(); - let mut nonlocals = HashSet::new(); - let mut decl_assigned = HashSet::new(); + let mut globals = HashSet::default(); + let mut nonlocals = HashSet::default(); + let mut decl_assigned = HashSet::default(); for s in body { collect_decls(s, &mut globals, &mut nonlocals, &mut decl_assigned); } @@ -7132,7 +7270,7 @@ impl Compiler { // Resolve outer-scope free vars for names read by the body that // aren't bound locally. - let mut reads = HashSet::new(); + let mut reads = HashSet::default(); for s in body { collect_reads_stmt(s, &mut reads); } @@ -7198,7 +7336,7 @@ impl Compiler { // the class scope (PEP 227) and still reach the // enclosing function's `y` — forward the cell // without touching the class-level binding. - inner.class_transparent_frees.insert(name.clone()); + inner.class_transparent_frees.add_name(name); } else { inner .bindings @@ -7213,12 +7351,12 @@ impl Compiler { // `__classdict__` cells (`dictbytype` first, the implicit // cells appended by `compiler_enter_scope`). { - let mut comp_cells = HashSet::new(); + let mut comp_cells = HashSet::default(); for s in body { inner.collect_comp_cells_stmt(s, &mut comp_cells); } if !comp_cells.is_empty() { - let implicit: Vec = inner + let implicit: Vec = inner .co .cellvars .iter() @@ -7257,7 +7395,7 @@ impl Compiler { inner.emit_load_name("__name__"); inner.emit_store_name("__module__"); let qualname_str = inner.co.qualname.clone(); - let qualname_const = inner.intern_constant(Constant::Str(qualname_str)); + let qualname_const = inner.intern_constant(Constant::Str(qualname_str.to_string())); inner.emit(OpCode::LoadConst, qualname_const); inner.emit_store_name("__qualname__"); // A `nonlocal __firstlineno__` declaration in the class body @@ -7399,7 +7537,7 @@ impl Compiler { // the class scope (nested functions included; nested classes // collect their own), regardless of parameter names. { - let mut attrs: HashSet = HashSet::new(); + let mut attrs: HashSet = HashSet::default(); collect_self_attr_stores(unmangled_body, "self", &mut attrs); let mut attrs: Vec = attrs.into_iter().collect(); attrs.sort(); @@ -7432,9 +7570,9 @@ impl Compiler { let inner_freevars = inner_code.freevars.clone(); for free in &inner_freevars { - if matches!(self.bindings.get(free), Some(Binding::Local)) { - self.bindings.insert(free.clone(), Binding::Cell); - if !self.co.cellvars.contains(free) { + if matches!(self.bindings.get(free.as_str()), Some(Binding::Local)) { + self.bindings.insert(free.to_string(), Binding::Cell); + if !has_name(&self.co.cellvars, free) { self.co.cellvars.push(free.clone()); } } @@ -9554,7 +9692,7 @@ impl Compiler { if let Some(i) = self.co.varnames.iter().position(|n| n == name) { return i as u32; } - self.co.varnames.push(name.to_owned()); + self.co.varnames.push(Name::from(name.to_owned())); (self.co.varnames.len() - 1) as u32 } @@ -11079,7 +11217,7 @@ impl Compiler { value: Option<&Expr>, generators: &[Comprehension], ) -> HashSet { - let mut needed = HashSet::new(); + let mut needed = HashSet::default(); collect_comp_scope_inner_free( elt, value, @@ -11088,7 +11226,7 @@ impl Compiler { &mut needed, &self.free_scan(true), ); - let mut targets = HashSet::new(); + let mut targets = HashSet::default(); for g in generators { collect_target_names(&g.target, &mut targets); } @@ -11143,7 +11281,7 @@ impl Compiler { // `[x for [x for x in r][0] in l]` keeps the outer `x` as the // enclosing scope's variable rather than a hidden local // (test_listcomps `test_nested_2`). - let mut used = HashSet::new(); + let mut used = HashSet::default(); for (gi, g) in generators.iter().enumerate() { Self::collect_names_shallow(&g.target, &mut used); if gi > 0 { @@ -11191,7 +11329,7 @@ impl Compiler { let (kind, elt, value, generators) = match &expr.kind { ExprKind::Name(n) => { if !bound.contains(n) { - out.insert(n.clone()); + out.add_name(n); } return; } @@ -11228,7 +11366,7 @@ impl Compiler { } let depth = bound.len(); for g in generators { - let mut names = HashSet::new(); + let mut names = HashSet::default(); collect_target_names(&g.target, &mut names); bound.extend(names); } @@ -11256,7 +11394,7 @@ impl Compiler { fn collect_names_shallow(expr: &Expr, out: &mut HashSet) { match &expr.kind { ExprKind::Name(n) => { - out.insert(n.clone()); + out.add_name(n); } ExprKind::Lambda { args, .. } | ExprKind::TypeParamFn { args, .. } => { for d in &args.defaults { @@ -11507,11 +11645,11 @@ impl Compiler { let pos = self.free_order.iter().position(|n| n == name).unwrap_or(0); (self.co.cellvars.len() + pos) as u32 } else { - if !self.co.cellvars.contains(name) { + if !has_name(&self.co.cellvars, name) { // Normally pre-registered by the scope's // analysis (`register_comp_cells`); a late // arrival still gets its slot. - self.co.cellvars.push(name.clone()); + self.co.cellvars.push(Name::from(name.clone())); } self.co.cellvars.iter().position(|n| n == name).unwrap_or(0) as u32 }; @@ -11684,9 +11822,9 @@ impl Compiler { // PEP 3155: a comprehension scope gets a dotted qualname like any // other nested scope (`C.m..`); CPython's // `compiler_set_qualname` doesn't special-case comprehensions. - inner.co.qualname = self.compute_child_qualname(name); + inner.co.qualname = Name::unpooled(&self.compute_child_qualname(name)); inner.co.arg_count = 1; - inner.co.varnames.push(".0".to_owned()); + inner.co.varnames.push(Name::from(".0".to_owned())); inner.bindings.insert(".0".to_owned(), Binding::Local); if is_async_comp && !matches!(kind, CompKind::Generator) { inner.co.is_coroutine = true; @@ -11720,7 +11858,7 @@ impl Compiler { // an extra strong reference for the whole activation, and pandas' // chained-assignment detection (`getrefcount(self) <= 3` in // `DataFrame.__setitem__`) is calibrated against CPython counts. - let mut reads = HashSet::new(); + let mut reads = HashSet::default(); collect_reads_expr(elt, &mut reads); if let Some(v) = value { collect_reads_expr(v, &mut reads); @@ -11743,7 +11881,7 @@ impl Compiler { // one — silently aliasing later closure reads. CPython's symtable binds // comprehension targets first for exactly this reason. for g in generators { - let mut assigned = HashSet::new(); + let mut assigned = HashSet::default(); collect_target_names(&g.target, &mut assigned); for n in assigned { inner.bindings.insert(n, Binding::Local); @@ -11786,8 +11924,8 @@ impl Compiler { _ => { if matches!(enclosing, None | Some(Binding::Local)) { self.bindings.insert(name.clone(), Binding::Cell); - if !self.co.cellvars.contains(&name) { - self.co.cellvars.push(name.clone()); + if !has_name(&self.co.cellvars, &name) { + self.co.cellvars.push(Name::from(name.clone())); } } Binding::Free @@ -11871,13 +12009,13 @@ impl Compiler { for name in needed_in_inner { if matches!(inner.bindings.get(&name), Some(Binding::Local)) { inner.bindings.insert(name.clone(), Binding::Cell); - if !inner.co.cellvars.contains(&name) { - inner.co.cellvars.push(name); + if !has_name(&inner.co.cellvars, &name) { + inner.co.cellvars.push(Name::from(name)); } } } if inner.lazy_class_ctx.is_none() { - let mut comp_cells = HashSet::new(); + let mut comp_cells = HashSet::default(); for (gi, g) in generators.iter().enumerate() { if gi > 0 { inner.collect_comp_cells_expr(&g.iter, &mut comp_cells); @@ -11949,9 +12087,9 @@ impl Compiler { // Promote our locals to cells where needed. for free in &inner_freevars { - if matches!(self.bindings.get(free), Some(Binding::Local)) { - self.bindings.insert(free.clone(), Binding::Cell); - if !self.co.cellvars.contains(free) { + if matches!(self.bindings.get(free.as_str()), Some(Binding::Local)) { + self.bindings.insert(free.to_string(), Binding::Cell); + if !has_name(&self.co.cellvars, free) { self.co.cellvars.push(free.clone()); } } @@ -12393,7 +12531,7 @@ fn check_comp_walrus_nest( )); } for scope in stack.iter_mut() { - scope.walrus_targets.insert(n.clone()); + scope.walrus_targets.add_name(n); } } visit(value, in_class_body, stack) @@ -12522,7 +12660,7 @@ fn check_comp_walrus_nest( // iterable (test_named_expressions' "Lambda expression" / // "Nested comprehension body" cases). reject_walrus_in_iterable(&g.iter)?; - let mut names = HashSet::new(); + let mut names = HashSet::default(); collect_target_names(&g.target, &mut names); for scope in stack.iter() { for n in &names { @@ -12944,7 +13082,7 @@ fn collect_pep695_header_reads( out: &mut HashSet, scan: &FreeScan, ) { - let mut reads = HashSet::new(); + let mut reads = HashSet::default(); let mut read = |e: &Expr| collect_class_visible_reads(e, outer_bindings, &mut reads, scan); let (type_params, fn_parts) = match &stmt.kind { StmtKind::FunctionDef { @@ -13216,7 +13354,7 @@ fn collect_inner_free( // enclosing `T = …` must not become a cell for a nested // `def f[T](x: T)`). if let Some(type_params) = generic_type_params(stmt) { - let mut inner = HashSet::new(); + let mut inner = HashSet::default(); collect_pep695_header_reads(stmt, outer_bindings, &mut inner, scan); collect_inner_free_impl(stmt, outer_bindings, &mut inner, scan); remove_type_param_names(stmt, type_params, &mut inner); @@ -13353,25 +13491,25 @@ fn collect_inner_free_impl( // The body is its own scope, no longer directly in a class // body. let scan = &scan.nested(); - let mut inner_locals: HashSet = HashSet::new(); + let mut inner_locals: HashSet = HashSet::default(); for a in &args.posonlyargs { - inner_locals.insert(a.name.clone()); + inner_locals.add_name(&a.name); } for a in &args.args { - inner_locals.insert(a.name.clone()); + inner_locals.add_name(&a.name); } if let Some(va) = &args.vararg { - inner_locals.insert(va.name.clone()); + inner_locals.add_name(&va.name); } for a in &args.kwonlyargs { - inner_locals.insert(a.name.clone()); + inner_locals.add_name(&a.name); } if let Some(kw) = &args.kwarg { - inner_locals.insert(kw.name.clone()); + inner_locals.add_name(&kw.name); } - let mut inner_globals = HashSet::new(); - let mut inner_nonlocals = HashSet::new(); - let mut inner_assigned = HashSet::new(); + let mut inner_globals = HashSet::default(); + let mut inner_nonlocals = HashSet::default(); + let mut inner_assigned = HashSet::default(); for s in body { collect_decls( s, @@ -13386,11 +13524,11 @@ fn collect_inner_free_impl( // needed-from-outer regardless of whether `outer_bindings` // knows about it yet (it'll be promoted on the way down). for n in &inner_nonlocals { - out.insert(n.clone()); + out.add_name(n); } // Reads inside the inner that aren't locals there → // candidates for promotion. - let mut inner_reads = HashSet::new(); + let mut inner_reads = HashSet::default(); for s in body { collect_reads_stmt_fn(s, &mut inner_reads); } @@ -13417,7 +13555,7 @@ fn collect_inner_free_impl( // the child's cell, not ours (`def _tp_cache(func): def // decorator(func): def inner(): func` must not promote the // outer `func`). `nonlocal` in the child reaches through. - let mut deeper = HashSet::new(); + let mut deeper = HashSet::default(); for s in body { collect_inner_free(s, outer_bindings, &mut deeper, scan); } @@ -13464,26 +13602,26 @@ fn collect_inner_free_impl( mangled_body = b; &mangled_body }; - let mut class_assigned = HashSet::new(); - let mut class_globals = HashSet::new(); - let mut class_nonlocals = HashSet::new(); + let mut class_assigned = HashSet::default(); + let mut class_globals = HashSet::default(); + let mut class_nonlocals = HashSet::default(); for s in body { collect_assigned(s, &mut class_assigned); collect_decls( s, &mut class_globals, &mut class_nonlocals, - &mut HashSet::new(), + &mut HashSet::default(), ); } // Names referenced *anywhere* in the class body (including // method bodies) that aren't bound inside the class are // candidates for outer-scope free promotion. - let mut class_reads = HashSet::new(); + let mut class_reads = HashSet::default(); for s in body { collect_reads_stmt(s, &mut class_reads); } - let mut from_body = HashSet::new(); + let mut from_body = HashSet::default(); for r in class_reads { if !class_assigned.contains(&r) { from_body.insert(r); @@ -13494,7 +13632,7 @@ fn collect_inner_free_impl( // enclosing function's `__firstlineno__` a cell even though // the body never reads it). for n in &class_nonlocals { - from_body.insert(n.clone()); + from_body.add_name(n); } // The nested scopes are analyzed as *the class body* sees // them, not as this scope does: an inlined comprehension in @@ -13643,7 +13781,7 @@ fn collect_inner_free_impl( // (GLOBAL_IMPLICIT), never as a free variable of the // enclosing function (`class D: C: C = field()` inside // a `def` where `C` is a local). - let mut reads = HashSet::new(); + let mut reads = HashSet::default(); collect_reads_expr(annotation, &mut reads); for r in reads { if !scan.class_binds.as_ref().is_some_and(|b| b.contains(&r)) { @@ -13693,9 +13831,9 @@ fn collect_inner_free_impl( /// `True` when a method body references `super` or `__class__` so the /// compiler knows to capture the class's `__class__` cell. fn method_references_class(body: &[Stmt]) -> bool { - let mut globals = HashSet::new(); - let mut nonlocals = HashSet::new(); - let mut assigned = HashSet::new(); + let mut globals = HashSet::default(); + let mut nonlocals = HashSet::default(); + let mut assigned = HashSet::default(); for s in body { collect_decls(s, &mut globals, &mut nonlocals, &mut assigned); collect_walrus_stmt(s, &mut assigned); @@ -13790,7 +13928,7 @@ fn body_reads_super_or_class(body: &[Stmt]) -> bool { } any_class(stmts) }; - let mut reads = HashSet::new(); + let mut reads = HashSet::default(); if has_nested_class(body) { // Only clone when there is a class body to blank out. let mut stripped = body.to_vec(); @@ -14557,7 +14695,7 @@ fn collect_class_visible_reads( out: &mut HashSet, scan: &FreeScan, ) { - let mut all = HashSet::new(); + let mut all = HashSet::default(); collect_reads_expr(expr, &mut all); if let Some(binds) = &scan.class_binds { all.retain(|n| !binds.contains(n)); @@ -14613,7 +14751,7 @@ fn collect_inlined_comp_inner_free( if let Some(first) = generators.first() { collect_inner_free_expr(&first.iter, outer_bindings, out, scan); } - let mut inner = HashSet::new(); + let mut inner = HashSet::default(); collect_comp_scope_inner_free(elt, value, generators, outer_bindings, &mut inner, scan); if scan.class_body { // The class namespace is invisible from inside the @@ -14633,7 +14771,7 @@ fn collect_inlined_comp_inner_free( } collect_reads_expr(elt, &mut inner); } - let mut bound = HashSet::new(); + let mut bound = HashSet::default(); for g in generators { collect_target_names(&g.target, &mut bound); } @@ -14684,23 +14822,23 @@ fn collect_inner_free_expr( collect_class_visible_reads(body, outer_bindings, out, scan); } ExprKind::Lambda { args, body } | ExprKind::TypeParamFn { args, body } => { - let mut inner_locals: HashSet = HashSet::new(); + let mut inner_locals: HashSet = HashSet::default(); for a in &args.posonlyargs { - inner_locals.insert(a.name.clone()); + inner_locals.add_name(&a.name); } for a in &args.args { - inner_locals.insert(a.name.clone()); + inner_locals.add_name(&a.name); } if let Some(va) = &args.vararg { - inner_locals.insert(va.name.clone()); + inner_locals.add_name(&va.name); } for a in &args.kwonlyargs { - inner_locals.insert(a.name.clone()); + inner_locals.add_name(&a.name); } if let Some(kw) = &args.kwarg { - inner_locals.insert(kw.name.clone()); + inner_locals.add_name(&kw.name); } - let mut reads = HashSet::new(); + let mut reads = HashSet::default(); collect_reads_deep(body, &mut reads); for r in reads { if !inner_locals.contains(&r) { @@ -14734,11 +14872,11 @@ fn collect_inner_free_expr( ExprKind::ListComp { elt, generators } | ExprKind::SetComp { elt, generators } | ExprKind::GeneratorExp { elt, generators } => { - let mut inner_locals: HashSet = HashSet::new(); + let mut inner_locals: HashSet = HashSet::default(); for g in generators { collect_target_names(&g.target, &mut inner_locals); } - let mut reads = HashSet::new(); + let mut reads = HashSet::default(); collect_reads_deep(elt, &mut reads); for (gi, g) in generators.iter().enumerate() { // The outermost iterable evaluates in the *enclosing* @@ -14770,11 +14908,11 @@ fn collect_inner_free_expr( value, generators, } => { - let mut inner_locals: HashSet = HashSet::new(); + let mut inner_locals: HashSet = HashSet::default(); for g in generators { collect_target_names(&g.target, &mut inner_locals); } - let mut reads = HashSet::new(); + let mut reads = HashSet::default(); collect_reads_deep(key, &mut reads); collect_reads_deep(value, &mut reads); for (gi, g) in generators.iter().enumerate() { @@ -14906,7 +15044,7 @@ fn collect_self_attr_stores(stmts: &[Stmt], self_name: &str, out: &mut HashSet { if matches!(&value.kind, ExprKind::Name(n) if n == self_name) { - out.insert(attr.clone()); + out.add_name(attr); } } ExprKind::Tuple(elts) | ExprKind::List(elts) => { @@ -15366,7 +15504,7 @@ fn collect_assigned(stmt: &Stmt, out: &mut HashSet) { | StmtKind::AsyncFunctionDef { name, .. } | StmtKind::ClassDef { name, .. } | StmtKind::TypeAlias { name, .. } => { - out.insert(name.clone()); + out.add_name(name); } StmtKind::Try { body, @@ -15379,7 +15517,7 @@ fn collect_assigned(stmt: &Stmt, out: &mut HashSet) { } for h in handlers { if let Some(n) = &h.name { - out.insert(n.clone()); + out.add_name(n); } for s in &h.body { collect_assigned(s, out); @@ -15692,7 +15830,7 @@ fn collect_walrus_expr(expr: &Expr, out: &mut HashSet) { | ExprKind::SetComp { elt, generators } | ExprKind::GeneratorExp { elt, generators } => { collect_comp_scope_walruses(elt, None, generators, &mut |n| { - out.insert(n.to_owned()); + out.add_name(n); }); } ExprKind::DictComp { @@ -15701,7 +15839,7 @@ fn collect_walrus_expr(expr: &Expr, out: &mut HashSet) { generators, } => { collect_comp_scope_walruses(key, Some(value), generators, &mut |n| { - out.insert(n.to_owned()); + out.add_name(n); }); } ExprKind::Yield(value) => { @@ -15737,7 +15875,7 @@ fn collect_global_decls_deep(stmt: &Stmt, out: &mut HashSet) { match &stmt.kind { StmtKind::Global(ns) => { for n in ns { - out.insert(n.clone()); + out.add_name(n); } } StmtKind::FunctionDef { body, .. } @@ -15828,7 +15966,7 @@ fn class_level_reads_dunder(body: &[Stmt], name: &str) -> bool { /// enclosing function's `c`, while `class B: c: str` or `class B: x = 1; /// y = x` alone never does). fn class_body_propagating_reads(body: &[Stmt], out: &mut HashSet) { - let mut inner = HashSet::new(); + let mut inner = HashSet::default(); for s in body { collect_reads_stmt_in(s, &mut inner, false); } @@ -15847,16 +15985,16 @@ fn class_body_propagating_reads(body: &[Stmt], out: &mut HashSet) { // when read at class level, and through `__classdict__` in a // class-visible annotation scope; only a nested scope's free read // of it looks past the class. - let mut class_bound = HashSet::new(); - let mut class_globals = HashSet::new(); - let mut class_nonlocals = HashSet::new(); + let mut class_bound = HashSet::default(); + let mut class_globals = HashSet::default(); + let mut class_nonlocals = HashSet::default(); for s in body { collect_assigned(s, &mut class_bound); collect_decls( s, &mut class_globals, &mut class_nonlocals, - &mut HashSet::new(), + &mut HashSet::default(), ); } let shadowed: Vec = inner @@ -15868,7 +16006,7 @@ fn class_body_propagating_reads(body: &[Stmt], out: &mut HashSet) { .cloned() .collect(); if !shadowed.is_empty() { - let mut nested = HashSet::new(); + let mut nested = HashSet::default(); class_nested_scope_reads(body, &mut nested); for n in shadowed { if !nested.contains(&n) { @@ -15894,7 +16032,7 @@ fn class_nested_scope_reads(body: &[Stmt], out: &mut HashSet) { { expr_nested(d, out); } - let mut inner = HashSet::new(); + let mut inner = HashSet::default(); collect_reads_expr(body, &mut inner); for a in args .posonlyargs @@ -15934,7 +16072,7 @@ fn class_nested_scope_reads(body: &[Stmt], out: &mut HashSet) { if let Some(first) = generators.first() { expr_nested(&first.iter, out); } - let mut inner = HashSet::new(); + let mut inner = HashSet::default(); for (gi, g) in generators.iter().enumerate() { if gi > 0 { collect_reads_expr(&g.iter, &mut inner); @@ -15948,7 +16086,7 @@ fn class_nested_scope_reads(body: &[Stmt], out: &mut HashSet) { collect_reads_expr(v, &mut inner); } collect_reads_expr(elt, &mut inner); - let mut bound = HashSet::new(); + let mut bound = HashSet::default(); for g in generators { collect_target_names(&g.target, &mut bound); } @@ -16009,7 +16147,7 @@ fn class_nested_scope_reads(body: &[Stmt], out: &mut HashSet) { mangled_body = b; &mangled_body }; - let mut through = HashSet::new(); + let mut through = HashSet::default(); class_body_propagating_reads(body, &mut through); for dunder in CLASS_DUNDERS { through.remove(dunder); @@ -16128,11 +16266,11 @@ fn class_nested_scope_reads(body: &[Stmt], out: &mut HashSet) { /// reach up even when only written). Decorators, defaults and /// annotations are the enclosing scope's business. fn function_free_names(args: &AstArguments, body: &[Stmt]) -> HashSet { - let mut nested_reads = HashSet::new(); + let mut nested_reads = HashSet::default(); for s in body { collect_reads_stmt_in(s, &mut nested_reads, true); } - let mut nested_locals: HashSet = HashSet::new(); + let mut nested_locals: HashSet = HashSet::default(); for a in args .posonlyargs .iter() @@ -16141,11 +16279,11 @@ fn function_free_names(args: &AstArguments, body: &[Stmt]) -> HashSet { .chain(&args.vararg) .chain(&args.kwarg) { - nested_locals.insert(a.name.clone()); + nested_locals.add_name(&a.name); } - let mut nested_globals = HashSet::new(); - let mut nested_nonlocals = HashSet::new(); - let mut nested_assigned = HashSet::new(); + let mut nested_globals = HashSet::default(); + let mut nested_nonlocals = HashSet::default(); + let mut nested_assigned = HashSet::default(); for s in body { collect_decls( s, @@ -16291,12 +16429,12 @@ fn class_body_reads_dunder(body: &[Stmt], name: &str) -> bool { // function. _ => { if stmt_reads_dunder_at_class_level(stmt, name) { - out.insert(name.to_owned()); + out.add_name(name); } } } } - let mut reads = HashSet::new(); + let mut reads = HashSet::default(); for s in body { stmt_reads(s, &mut reads, name); } @@ -16308,7 +16446,7 @@ fn class_body_reads_dunder(body: &[Stmt], name: &str) -> bool { /// scope are skipped except for the parts evaluated in the enclosing /// scope (lambda defaults, a comprehension's outermost iterable). fn stmt_reads_dunder_at_class_level(stmt: &Stmt, name: &str) -> bool { - let mut all = HashSet::new(); + let mut all = HashSet::default(); collect_reads_stmt(stmt, &mut all); if !all.contains(name) { return false; @@ -16374,12 +16512,12 @@ fn collect_decls( match &stmt.kind { StmtKind::Global(ns) => { for n in ns { - globals.insert(n.clone()); + globals.add_name(n); } } StmtKind::Nonlocal(ns) => { for n in ns { - nonlocals.insert(n.clone()); + nonlocals.add_name(n); } } StmtKind::Assign { targets, .. } => { @@ -16445,7 +16583,7 @@ fn collect_decls( | StmtKind::AsyncFunctionDef { name, .. } | StmtKind::ClassDef { name, .. } | StmtKind::TypeAlias { name, .. } => { - assigned.insert(name.clone()); + assigned.add_name(name); } StmtKind::Try { body, @@ -16458,7 +16596,7 @@ fn collect_decls( } for h in handlers { if let Some(n) = &h.name { - assigned.insert(n.clone()); + assigned.add_name(n); } for s in &h.body { collect_decls(s, globals, nonlocals, assigned); @@ -16593,7 +16731,7 @@ fn collect_target_names_ordered(expr: &Expr, out: &mut Vec) { fn collect_target_names(expr: &Expr, out: &mut HashSet) { match &expr.kind { ExprKind::Name(n) => { - out.insert(n.clone()); + out.add_name(n); } ExprKind::Tuple(items) | ExprKind::List(items) => { for x in items { @@ -16619,7 +16757,7 @@ fn collect_pattern_names(pat: &Pattern, out: &mut HashSet) { | PatternKind::Capture(None) | PatternKind::Star(None) => {} PatternKind::Capture(Some(n)) | PatternKind::Star(Some(n)) => { - out.insert(n.clone()); + out.add_name(n); } PatternKind::Sequence(items) => { for p in items { @@ -16631,7 +16769,7 @@ fn collect_pattern_names(pat: &Pattern, out: &mut HashSet) { collect_pattern_names(p, out); } if let Some(Some(n)) = rest { - out.insert(n.clone()); + out.add_name(n); } } PatternKind::Class { @@ -16652,7 +16790,7 @@ fn collect_pattern_names(pat: &Pattern, out: &mut HashSet) { } } PatternKind::As { pattern, name } => { - out.insert(name.clone()); + out.add_name(name); collect_pattern_names(pattern, out); } } @@ -17002,7 +17140,7 @@ fn collect_reads_stmt_in(stmt: &Stmt, out: &mut HashSet, fn_scope: bool) // See `collect_inner_free`: a generic statement's type parameters // are its hidden scope's locals, never reads of this scope. if let Some(type_params) = generic_type_params(stmt) { - let mut inner = HashSet::new(); + let mut inner = HashSet::default(); collect_reads_stmt_in_impl(stmt, &mut inner, fn_scope); remove_type_param_names(stmt, type_params, &mut inner); out.extend(inner); @@ -17134,7 +17272,7 @@ fn collect_reads_stmt_in_impl(stmt: &Stmt, out: &mut HashSet, fn_scope: StmtKind::TypeAlias { type_params, value, .. } => { - let mut nested = HashSet::new(); + let mut nested = HashSet::default(); collect_reads_expr(value, &mut nested); for tp in type_params { if let TypeParamKind::TypeVar { bound: Some(b) } = &tp.kind { @@ -17321,7 +17459,7 @@ fn collect_comp_reads( if let Some(first) = generators.first() { collect_reads_expr(&first.iter, out); } - let mut inner = HashSet::new(); + let mut inner = HashSet::default(); for (gi, g) in generators.iter().enumerate() { if gi > 0 { collect_reads_expr(&g.iter, &mut inner); @@ -17337,7 +17475,7 @@ fn collect_comp_reads( collect_reads_expr(v, &mut inner); } collect_reads_expr(elt, &mut inner); - let mut bound = HashSet::new(); + let mut bound = HashSet::default(); for g in generators { collect_target_names(&g.target, &mut bound); } @@ -17350,7 +17488,7 @@ fn collect_comp_reads( fn collect_reads_expr(expr: &Expr, out: &mut HashSet) { match &expr.kind { ExprKind::Name(n) => { - out.insert(n.clone()); + out.add_name(n); } ExprKind::Attribute { value, .. } | ExprKind::Starred(value) => { collect_reads_expr(value, out); @@ -17417,7 +17555,7 @@ fn collect_reads_expr(expr: &Expr, out: &mut HashSet) { } // The body is its own scope: what it reads reaches us only // when the lambda doesn't bind it itself (its parameters). - let mut inner = HashSet::new(); + let mut inner = HashSet::default(); collect_reads_expr(body, &mut inner); for a in args .posonlyargs diff --git a/crates/weavepy-compiler/src/mangle.rs b/crates/weavepy-compiler/src/mangle.rs index acdfa7fe..bfbdd63b 100644 --- a/crates/weavepy-compiler/src/mangle.rs +++ b/crates/weavepy-compiler/src/mangle.rs @@ -15,7 +15,7 @@ //! are mangled against their own (innermost) class name when their own //! body is compiled. -use std::collections::HashSet; +use crate::fxhash::HashSet; use weavepy_parser::ast::{ Arguments, Comprehension, ExceptHandler, Expr, ExprKind, MatchCase, Pattern, PatternKind, Stmt, @@ -45,7 +45,7 @@ pub(crate) fn mangle_class_body(class_name: &str, body: &mut [Stmt]) { } let m = Mangler { prefix: format!("_{stripped}"), - skip: HashSet::new(), + skip: HashSet::default(), only: None, }; for s in body { @@ -82,7 +82,7 @@ pub(crate) fn mangle_only_in_expr(class_name: &str, names: &HashSet, exp } let m = Mangler { prefix: format!("_{stripped}"), - skip: HashSet::new(), + skip: HashSet::default(), only: Some(names.clone()), }; m.expr(expr); diff --git a/crates/weavepy-compiler/src/name.rs b/crates/weavepy-compiler/src/name.rs new file mode 100644 index 00000000..71a19aa2 --- /dev/null +++ b/crates/weavepy-compiler/src/name.rs @@ -0,0 +1,289 @@ +//! Interned identifiers for code objects' name tables. +//! +//! A module's code objects repeat the same few identifiers (`self`, +//! `__name__`, `len`, a class's attribute names) across their `co_names`, +//! `co_varnames`, `co_freevars` and `co_cellvars`: importing `asyncio` +//! decodes about 38,000 entries, of which about 6,300 are distinct. A +//! [`Name`] is a shared, immutable string, and every name the compiler or +//! the code cache produces goes through one process-wide pool, so equal +//! identifiers share one allocation (as CPython interns them). +//! +//! The pool holds only names some code object still uses: when it has +//! doubled since it was last swept, the names no one else holds are +//! dropped from it. + +use std::borrow::Borrow; +use std::collections::HashSet; +use std::hash::{BuildHasherDefault, Hash, Hasher}; +use std::sync::{Arc, Mutex}; + +/// An identifier in a code object's name tables (see the module docs). +/// It reads as a `str`. +#[derive(Clone)] +pub struct Name(Arc); + +impl Name { + /// The pooled name equal to `s`. + pub fn new(s: &str) -> Name { + POOL.lock() + .unwrap_or_else(std::sync::PoisonError::into_inner) + .intern(s) + } + + /// A name equal to `s` outside the pool, for text few code objects + /// share (a qualified name): it costs no pool lookup, and equality + /// still compares the text. + pub fn unpooled(s: &str) -> Name { + Name(Arc::from(s)) + } + + #[inline] + pub fn as_str(&self) -> &str { + &self.0 + } + + /// The text as a `String`: a copy, without the formatting machinery + /// `ToString` goes through for a type that isn't `str` (a function + /// made per call takes its name this way). + #[allow(clippy::inherent_to_string_shadow_display)] + #[inline] + pub fn to_string(&self) -> String { + String::from(&*self.0) + } + + /// Whether `a` and `b` share one allocation (equal pooled names always + /// do). + #[inline] + pub fn ptr_eq(a: &Name, b: &Name) -> bool { + Arc::ptr_eq(&a.0, &b.0) + } +} + +/// The pool's hasher (FxHash's): a rotate, an exclusive-or and a +/// multiply per eight bytes, which is quick over short identifiers. +#[derive(Default)] +struct Fx(u64); + +impl Fx { + #[inline] + fn add(&mut self, word: u64) { + self.0 = (self.0.rotate_left(5) ^ word).wrapping_mul(0x517c_c1b7_2722_0a95); + } +} + +impl Hasher for Fx { + fn finish(&self) -> u64 { + self.0 + } + + fn write(&mut self, bytes: &[u8]) { + let (chunks, rest) = bytes.as_chunks::<8>(); + for &c in chunks { + self.add(u64::from_le_bytes(c)); + } + if !rest.is_empty() { + let mut last = [0u8; 8]; + last[..rest.len()].copy_from_slice(rest); + self.add(u64::from_le_bytes(last)); + } + } + + fn write_u8(&mut self, b: u8) { + self.add(u64::from(b)); + } +} + +struct Pool { + names: Option, BuildHasherDefault>>, + /// The size past which the next insertion sweeps unused names. + sweep_at: usize, +} + +static POOL: Mutex = Mutex::new(Pool { + names: None, + sweep_at: 4096, +}); + +impl Pool { + fn intern(&mut self, s: &str) -> Name { + let names = self.names.get_or_insert_with(HashSet::default); + if let Some(name) = names.get(s) { + return Name(name.clone()); + } + if names.len() >= self.sweep_at { + names.retain(|name| Arc::strong_count(name) > 1); + self.sweep_at = (names.len() * 2).max(4096); + } + let name: Arc = Arc::from(s); + names.insert(name.clone()); + Name(name) + } +} + +impl Default for Name { + /// The empty name, made once (every default code object has two). + fn default() -> Self { + static EMPTY: std::sync::OnceLock = std::sync::OnceLock::new(); + EMPTY.get_or_init(|| Name::new("")).clone() + } +} + +impl std::ops::Deref for Name { + type Target = str; + + #[inline] + fn deref(&self) -> &str { + &self.0 + } +} + +impl AsRef for Name { + fn as_ref(&self) -> &str { + &self.0 + } +} + +impl Borrow for Name { + fn borrow(&self) -> &str { + &self.0 + } +} + +impl PartialEq for Name { + #[inline] + fn eq(&self, other: &Name) -> bool { + Arc::ptr_eq(&self.0, &other.0) || *self.0 == *other.0 + } +} + +impl Eq for Name {} + +impl PartialEq for Name { + fn eq(&self, other: &str) -> bool { + &*self.0 == other + } +} + +impl PartialEq<&str> for Name { + fn eq(&self, other: &&str) -> bool { + &*self.0 == *other + } +} + +impl PartialEq for Name { + fn eq(&self, other: &String) -> bool { + *self.0 == **other + } +} + +impl PartialEq for str { + fn eq(&self, other: &Name) -> bool { + self == &*other.0 + } +} + +impl PartialEq for &str { + fn eq(&self, other: &Name) -> bool { + *self == &*other.0 + } +} + +impl PartialEq for String { + fn eq(&self, other: &Name) -> bool { + **self == *other.0 + } +} + +impl PartialOrd for Name { + fn partial_cmp(&self, other: &Name) -> Option { + Some(self.cmp(other)) + } +} + +impl Ord for Name { + fn cmp(&self, other: &Name) -> std::cmp::Ordering { + self.0.cmp(&other.0) + } +} + +impl Hash for Name { + // As a `str`, which `Borrow` requires. + fn hash(&self, state: &mut H) { + self.0.hash(state); + } +} + +impl std::fmt::Debug for Name { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + (*self.0).fmt(f) + } +} + +impl std::fmt::Display for Name { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + (*self.0).fmt(f) + } +} + +impl From<&str> for Name { + fn from(s: &str) -> Name { + Name::new(s) + } +} + +impl From for Name { + fn from(s: String) -> Name { + Name::new(&s) + } +} + +impl From<&String> for Name { + fn from(s: &String) -> Name { + Name::new(s) + } +} + +impl From<&Name> for Name { + fn from(s: &Name) -> Name { + s.clone() + } +} + +impl From for String { + fn from(s: Name) -> String { + String::from(&*s.0) + } +} + +impl From<&Name> for String { + fn from(s: &Name) -> String { + String::from(&*s.0) + } +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn equal_names_share_one_allocation() { + let a = Name::new("pooled_name_a"); + let b = Name::from(String::from("pooled_name_a")); + assert!(Name::ptr_eq(&a, &b)); + assert_eq!(a, "pooled_name_a"); + assert_eq!(a.as_str(), "pooled_name_a"); + assert_ne!(a, Name::new("pooled_name_b")); + } + + #[test] + fn sweeping_keeps_names_in_use() { + let kept = Name::new("kept_through_sweeps"); + for i in 0..20_000 { + let _ = Name::new(&format!("transient_{i}")); + } + let again = Name::new("kept_through_sweeps"); + assert!(Name::ptr_eq(&kept, &again)); + let pool = POOL.lock().unwrap(); + assert!(pool.names.as_ref().unwrap().len() < 20_000); + } +} diff --git a/crates/weavepy-compiler/src/native_code.rs b/crates/weavepy-compiler/src/native_code.rs index b7e95b0a..349e545d 100644 --- a/crates/weavepy-compiler/src/native_code.rs +++ b/crates/weavepy-compiler/src/native_code.rs @@ -8,23 +8,37 @@ //! mismatch or malformed input as a cache miss. //! //! Filenames aren't stored: every code object in a cached module shares -//! the module's filename, which the reader supplies. +//! the module's filename, which the reader supplies. A module's name +//! tables refer to its distinct identifiers by number after their first +//! appearance, so the reader decodes and pools each identifier once. +//! +//! The layout: the version byte, the offset of the table section as four +//! little-endian bytes, the module's code object, then the table section, +//! which holds every code object's line, column and wire-mark tables in +//! the order the code records their lengths. A reader copies the section +//! whole and decodes a table only when something reads it. use std::sync::Arc; use crate::bytecode::{CacheTable, Instruction, OpCode}; -use crate::{CodeObject, ColSpan, Constant, ExcHandler}; +use crate::{CodeObject, ColSpan, Constant, ExcHandler, Name}; /// The layout revision; bump it whenever the encoding changes. -pub const VERSION: u8 = 4; +pub const VERSION: u8 = 7; /// Encode `code` (and its nested code objects). `None` for a code object /// the format doesn't carry: one with raw CPython wire overrides, or with /// a constant that has no fixed value. pub fn encode(code: &CodeObject) -> Option> { - let mut w = Writer(Vec::with_capacity(4096)); + let mut w = Writer::new(Vec::with_capacity(4096)); w.byte(VERSION); + // The table section's offset, filled in below. + w.0.extend_from_slice(&[0; 4]); w.code(code)?; + let at = u32::try_from(w.0.len()).ok()?; + w.0[1..5].copy_from_slice(&at.to_le_bytes()); + let tables = std::mem::take(&mut w.2); + w.0.extend_from_slice(&tables); Some(w.0) } @@ -95,48 +109,89 @@ pub(crate) fn decode_wire_marks(bytes: &[u8]) -> Option> { /// holds all their line and column tables and wire marks (see /// `LineTable`). pub fn decode(bytes: &[u8], filename: &str) -> Option { - let mut r = Reader { bytes, pos: 0 }; - if r.byte()? != VERSION { + let at = tables_at(bytes)?; + let tables = crate::TableBuffer::new(Box::<[u8]>::from(bytes.get(at..)?)); + decode_split(&bytes[..at], tables, filename) +} + +/// Where the table section of what [`encode`] wrote starts, from its +/// first five bytes (or more); `None` for input it didn't write. +pub fn tables_at(bytes: &[u8]) -> Option { + if bytes.first() != Some(&VERSION) { + return None; + } + let at = u32::from_le_bytes(bytes.get(1..5)?.try_into().ok()?) as usize; + (at >= 5).then_some(at) +} + +/// [`decode`] for input split at [`tables_at`]: `code` is what comes +/// before the table section and `tables` holds the section, which the +/// decoded code objects keep, reading a table from it only when +/// something asks for that table. +pub fn decode_split(code: &[u8], tables: crate::TableBuffer, filename: &str) -> Option { + if tables_at(code)? != code.len() { return None; } + let tables_len = tables.bytes().len(); + let mut r = Reader { + bytes: &code[5..], + pos: 0, + }; let mut module = Module { filename: Arc::from(filename), - tables: Vec::new(), - buffer: Arc::new(std::sync::OnceLock::new()), + buffer: Arc::new(tables), + tables_len, + next: 0, + names: Vec::new(), }; - let code = r.code(&mut module, 0)?; - if r.pos != bytes.len() { - return None; - } - // (Copied rather than shrunk in place, which can keep the vector's - // spare capacity.) - let _ = module.buffer.set(Box::from(module.tables.as_slice())); - Some(code) + let decoded = r.code(&mut module, 0)?; + (r.pos == r.bytes.len() && module.next == tables_len).then_some(decoded) } /// What the code objects of one module decoded by [`decode`] share. struct Module { filename: Arc, - /// Every code object's encoded line and column tables and wire - /// marks, in order. - tables: Vec, - /// Where `tables` goes once the decoding is done. - buffer: Arc>>, + /// The table section (see the module docs). + buffer: Arc, + /// The section's length, and where its next table starts. + tables_len: usize, + next: usize, + /// The module's identifiers so far, in order of first appearance + /// (see [`Writer::names`]). + names: Vec, } impl Module { - /// Append an encoded table to the shared buffer. - fn table(&mut self, bytes: &[u8]) -> Option { - let start = u32::try_from(self.tables.len()).ok()?; - self.tables.extend_from_slice(bytes); - let end = u32::try_from(self.tables.len()).ok()?; - Some(crate::Encoded::new(self.buffer.clone(), start, end)) + /// The table section's next `len` bytes. + fn table(&mut self, len: usize) -> Option { + let start = self.next; + let end = start + .checked_add(len) + .filter(|&end| end <= self.tables_len)?; + self.next = end; + Some(crate::Encoded::new( + self.buffer.clone(), + u32::try_from(start).ok()?, + u32::try_from(end).ok()?, + )) } } -struct Writer(Vec); +/// The output, the number of each identifier written so far (see +/// [`Writer::names`]), and the table section (see the module docs). +struct Writer(Vec, std::collections::HashMap, Vec); impl Writer { + fn new(out: Vec) -> Self { + Writer(out, std::collections::HashMap::new(), Vec::new()) + } + + /// Move a table into the table section, recording its length. + fn table(&mut self, table: Vec) { + self.uint(table.len() as u64); + self.2.extend_from_slice(&table); + } + fn byte(&mut self, b: u8) { self.0.push(b); } @@ -165,6 +220,27 @@ impl Writer { } } + /// An identifier: its number plus one when the module wrote it + /// before, else a zero and its text (which gives it the next number). + fn name(&mut self, s: &Name) { + if let Some(&i) = self.1.get(s.as_str()) { + self.uint(u64::from(i) + 1); + } else { + let i = self.1.len() as u32; + self.1.insert(s.as_str().to_owned(), i); + self.uint(0); + self.bytes(s.as_bytes()); + } + } + + /// A name table: its length, then its identifiers (see [`Self::name`]). + fn names(&mut self, v: &[Name]) { + self.uint(v.len() as u64); + for s in v { + self.name(s); + } + } + fn u32s(&mut self, v: &[u32]) { self.uint(v.len() as u64); for &x in v { @@ -223,8 +299,8 @@ impl Writer { if c.wire.is_some() { return None; } - self.bytes(c.name.as_bytes()); - self.bytes(c.qualname.as_bytes()); + self.name(&c.name); + self.name(&c.qualname); self.uint(c.instructions.len() as u64); for ins in &c.instructions { self.byte(ins.op as u8); @@ -234,10 +310,10 @@ impl Writer { for k in &c.constants { self.constant(k)?; } - self.strs(&c.names); - self.strs(&c.varnames); - self.strs(&c.freevars); - self.strs(&c.cellvars); + self.names(&c.names); + self.names(&c.varnames); + self.names(&c.freevars); + self.names(&c.cellvars); self.uint(c.exception_table.len() as u64); for h in &c.exception_table { self.uint(u64::from(h.start)); @@ -247,12 +323,12 @@ impl Writer { self.byte(u8::from(h.push_lasti)); } // Line numbers in runs: a statement's instructions share a line. - self.line_runs(&c.linetable); - // The column spans as one length-prefixed block, which a reader - // keeps encoded until something reads a column (see `ColTable`). - let mut cols = Writer(Vec::new()); + let mut lines = Writer::new(Vec::new()); + lines.line_runs(&c.linetable); + self.table(lines.0); + let mut cols = Writer::new(Vec::new()); cols.col_runs(&c.coltable)?; - self.bytes(&cols.0); + self.table(cols.0); self.uint(u64::from(c.arg_count)); self.uint(u64::from(c.posonly_count)); self.uint(u64::from(c.kwonly_count)); @@ -277,7 +353,12 @@ impl Writer { self.uint(u64::from(c.future_flags)); self.uint(c.stacksize.map_or(0, |s| u64::from(s) + 1)); self.u32s(c.no_interrupt_jumps()); - self.wire_marks(&c.wire_marks)?; + // (No table at all for code without marks.) + let mut marks = Writer::new(Vec::new()); + if !c.wire_marks.is_empty() { + marks.wire_marks(&c.wire_marks)?; + } + self.table(marks.0); self.strs(c.hidden_locals()); self.strs(c.const_identifiers()); Some(()) @@ -428,6 +509,34 @@ impl Reader<'_> { Some(v) } + /// An identifier [`Writer::name`] wrote. + fn name(&mut self, module: &mut Module) -> Option { + self.name_as(module, Name::new) + } + + /// An identifier [`Writer::name`] wrote, made with `make` (pooled or + /// not) if this is its first appearance. + fn name_as(&mut self, module: &mut Module, make: fn(&str) -> Name) -> Option { + Some(match self.uint()? { + 0 => { + let name = make(std::str::from_utf8(self.raw()?).ok()?); + module.names.push(name.clone()); + name + } + i => module.names.get(usize::try_from(i - 1).ok()?)?.clone(), + }) + } + + /// A name table [`Writer::names`] wrote. + fn names(&mut self, module: &mut Module) -> Option> { + let n = self.len()?; + let mut v = Vec::with_capacity(n); + for _ in 0..n { + v.push(self.name(module)?); + } + Some(v) + } + fn u32s(&mut self) -> Option> { let n = self.len()?; let mut v = Vec::with_capacity(n); @@ -460,25 +569,11 @@ impl Reader<'_> { Some(()) } - /// The bytes of a line-number block, checked as decoding would but - /// left encoded (see `LineTable`). - fn line_runs_raw(&mut self) -> Option<&[u8]> { - let start = self.pos; - self.line_runs(|_, _| {})?; - Some(&self.bytes[start..self.pos]) - } - - /// The bytes of a wire-mark block, checked for length but left - /// encoded (see `WireMarks`); empty for code without marks. - fn wire_marks_raw(&mut self) -> Option<&[u8]> { - let start = self.pos; - let n = self.table_len()?; - let end = self.pos.checked_add(n.div_ceil(2))?; - if end > self.bytes.len() { - return None; - } - self.pos = end; - Some(if n == 0 { &[] } else { &self.bytes[start..end] }) + /// The next table of the module's table section (see the module + /// docs), left encoded. + fn table(&mut self, module: &mut Module) -> Option { + let len = usize::try_from(self.uint()?).ok()?; + module.table(len) } fn f64(&mut self) -> Option { @@ -491,8 +586,9 @@ impl Reader<'_> { if depth > MAX_NESTING { return None; } - let name = self.string()?; - let qualname = self.string()?; + let name = self.name(module)?; + // (A qualified name other than a plain name is seldom shared.) + let qualname = self.name_as(module, Name::unpooled)?; let n = self.len()?; let mut instructions = Vec::with_capacity(n); for _ in 0..n { @@ -504,10 +600,10 @@ impl Reader<'_> { for _ in 0..n { constants.push(self.constant(module, depth)?); } - let names = self.strs()?; - let varnames = self.strs()?; - let freevars = self.strs()?; - let cellvars = self.strs()?; + let names = self.names(module)?; + let varnames = self.names(module)?; + let freevars = self.names(module)?; + let cellvars = self.names(module)?; let n = self.len()?; let mut exception_table = Vec::with_capacity(n); for _ in 0..n { @@ -519,8 +615,8 @@ impl Reader<'_> { push_lasti: self.byte()? != 0, }); } - let linetable = crate::LineTable::encoded(module.table(self.line_runs_raw()?)?); - let coltable = crate::ColTable::encoded(module.table(self.raw()?)?); + let linetable = crate::LineTable::encoded(self.table(module)?); + let coltable = crate::ColTable::encoded(self.table(module)?); let arg_count = self.u32()?; let posonly_count = self.u32()?; let kwonly_count = self.u32()?; @@ -529,9 +625,11 @@ impl Reader<'_> { let future_flags = self.u32()?; let stacksize = self.u32()?.checked_sub(1); let no_interrupt_jumps = self.u32s()?; - let wire_marks = match self.wire_marks_raw()? { - [] => crate::WireMarks::default(), - marks => crate::WireMarks::encoded(module.table(marks)?), + let marks = self.table(module)?; + let wire_marks = if marks.is_empty() { + crate::WireMarks::default() + } else { + crate::WireMarks::encoded(marks) }; let mut rare = crate::CodeRare::default(); rare.set(crate::RareFields { @@ -618,8 +716,8 @@ mod tests { #[test] fn round_trips_constants_and_metadata() { let inner = CodeObject { - name: "f".to_owned(), - qualname: "C.f".to_owned(), + name: "f".into(), + qualname: "C.f".into(), filename: "m.py".into(), instructions: vec![ Instruction::new(OpCode::Resume, 0), @@ -627,7 +725,7 @@ mod tests { Instruction::new(OpCode::ReturnValue, 0), ], constants: vec![Constant::Int(-5)], - varnames: vec!["x".to_owned()], + varnames: vec!["x".into()], linetable: vec![1, 2, 2].into(), coltable: vec![ColSpan::default(); 3].into(), arg_count: 1, @@ -637,8 +735,8 @@ mod tests { ..CodeObject::default() }; let mut code = CodeObject { - name: "".to_owned(), - qualname: "".to_owned(), + name: "".into(), + qualname: "".into(), filename: "m.py".into(), instructions: vec![Instruction::new(OpCode::Nop, 0)], constants: vec![ @@ -660,7 +758,7 @@ mod tests { ))), Constant::Code(Arc::new(inner)), ], - names: vec!["print".to_owned()], + names: vec!["print".into()], exception_table: vec![ExcHandler { start: 0, end: 1, @@ -688,6 +786,37 @@ mod tests { assert_eq!(*inner.linetable, [1, 2, 2]); } + #[test] + fn encoded_tables_clone_and_mutate_independently() { + let code = CodeObject { + instructions: vec![Instruction::new(OpCode::Nop, 0); 3], + linetable: vec![1, 2, 2].into(), + coltable: vec![ColSpan::default(); 3].into(), + wire_marks: vec![0, 3, 0].into(), + ..CodeObject::default() + }; + let back = decode(&encode(&code).expect("encodable"), "m.py").expect("decodable"); + // A clone of a table still encoded shares the encoding. + let copy = back.clone(); + assert_eq!(*copy.linetable, [1, 2, 2]); + assert_eq!(*back.linetable, [1, 2, 2]); + // Mutating a table decodes it first, and leaves the others alone. + let mut owned = back.clone(); + owned.linetable.push(3); + owned.coltable.pop(); + assert_eq!(*owned.linetable, [1, 2, 2, 3]); + assert_eq!(owned.coltable.len(), 2); + assert_eq!(*back.linetable, [1, 2, 2]); + assert_eq!(back.coltable.len(), 3); + assert_eq!(&*copy.wire_marks, &[0, 3, 0]); + // A clone of a decoded table copies it. + let again = owned.clone(); + drop(owned); + assert_eq!(*again.linetable, [1, 2, 2, 3]); + // A default table reads as empty. + assert!(CodeObject::default().linetable.is_empty()); + } + #[test] fn round_trips_position_runs() { let span = |end_lineno, col, end_col| ColSpan { @@ -730,7 +859,7 @@ mod tests { #[test] fn rejects_truncated_or_foreign_input() { let code = CodeObject { - name: "".to_owned(), + name: "".into(), instructions: vec![Instruction::new(OpCode::Nop, 0)], constants: vec![Constant::Str("x".repeat(40))], ..CodeObject::default() diff --git a/crates/weavepy-compiler/src/validate.rs b/crates/weavepy-compiler/src/validate.rs index 70482ecb..e5ee0b3d 100644 --- a/crates/weavepy-compiler/src/validate.rs +++ b/crates/weavepy-compiler/src/validate.rs @@ -16,6 +16,7 @@ use weavepy_parser::ast::{ PatternKind, Stmt, StmtKind, }; +use crate::fxhash::NameSet; use crate::CompileError; /// `__future__` features understood by CPython 3.13. All are mandatory @@ -68,17 +69,17 @@ struct Scope { /// for functions; the parameter names themselves for /// [`ScopeKind::TypeParams`]. Consulted when resolving `nonlocal` /// declarations from nested scopes. - bound: std::collections::HashSet, + bound: crate::fxhash::HashSet, /// Names *read* so far, in source order (CPython's `USE` flag) — /// a later `global`/`nonlocal` for one of these is "used prior to /// … declaration". - used: std::collections::HashSet, + used: crate::fxhash::HashSet, /// Names assigned/deleted/bound so far (`DEF_LOCAL`) — a later /// declaration is "assigned to before … declaration". - assigned: std::collections::HashSet, + assigned: crate::fxhash::HashSet, /// Names annotated so far (`DEF_ANNOT`) — can never be declared /// global/nonlocal in this scope, before *or* after. - annotated: std::collections::HashSet, + annotated: crate::fxhash::HashSet, } impl Scope { @@ -87,10 +88,10 @@ impl Scope { kind, params: Vec::new(), directives: Vec::new(), - bound: std::collections::HashSet::new(), - used: std::collections::HashSet::new(), - assigned: std::collections::HashSet::new(), - annotated: std::collections::HashSet::new(), + bound: crate::fxhash::HashSet::default(), + used: crate::fxhash::HashSet::default(), + assigned: crate::fxhash::HashSet::default(), + annotated: crate::fxhash::HashSet::default(), } } @@ -168,7 +169,7 @@ impl Validator<'_> { /// Record a *read* of `name` in the current scope (CPython `USE`). fn mark_use(&mut self, name: &str) { - self.scope_mut().used.insert(name.to_owned()); + self.scope_mut().used.add_name(name); } /// Record a binding of `name` (CPython `DEF_LOCAL`). Comprehension @@ -180,7 +181,7 @@ impl Validator<'_> { .iter() .rposition(|s| s.kind != ScopeKind::Comprehension) .expect("scope stack always has a non-comprehension scope"); - self.scopes[idx].assigned.insert(name.to_owned()); + self.scopes[idx].assigned.add_name(name); } /// Visit an annotation expression. Under PEP 563 the annotation is @@ -281,12 +282,12 @@ impl Validator<'_> { // Body-level bindings (assignments, defs, imports, walrus // targets) participate in `nonlocal` resolution from nested // scopes. - let mut bound: std::collections::HashSet = + let mut bound: crate::fxhash::HashSet = params.iter().map(|(n, _)| (*n).to_owned()).collect(); { - let mut globals = std::collections::HashSet::new(); - let mut nonlocals = std::collections::HashSet::new(); - let mut assigned = std::collections::HashSet::new(); + let mut globals = crate::fxhash::HashSet::default(); + let mut nonlocals = crate::fxhash::HashSet::default(); + let mut assigned = crate::fxhash::HashSet::default(); for s in body { crate::collect_decls(s, &mut globals, &mut nonlocals, &mut assigned); crate::collect_walrus_stmt(s, &mut assigned); @@ -583,7 +584,7 @@ impl Validator<'_> { } } let n = n.clone(); - self.scope_mut().annotated.insert(n.clone()); + self.scope_mut().annotated.add_name(&n); self.mark_assigned(&n); } else { let n = n.clone(); diff --git a/crates/weavepy-conformance/src/ecosystem.rs b/crates/weavepy-conformance/src/ecosystem.rs index 844ebde5..01e517ec 100644 --- a/crates/weavepy-conformance/src/ecosystem.rs +++ b/crates/weavepy-conformance/src/ecosystem.rs @@ -100,7 +100,9 @@ pub struct SelftestSpec { pub command: String, /// `pytest --deselect` arguments — the measured, enumerated escapes. /// Every entry carries an inline manifest comment naming the failure - /// class. + /// class. Holds `deselect` plus the host OS's `deselect_` list + /// (`deselect_linux`, `deselect_macos`, `deselect_windows`), for an + /// escape that only one OS's runner needs. pub deselect: Vec, /// Optional wall budget for the self-test stage alone. pub timeout_seconds: Option, @@ -311,13 +313,12 @@ impl Manifest { .and_then(simple_tables::Value::as_str) .map(str::to_owned) .ok_or_else(|| anyhow::anyhow!("[{section}] missing command"))?; - let deselect = match kv.get("deselect") { - Some(simple_tables::Value::List(items)) => items.clone(), - Some(simple_tables::Value::Str(_)) => { - anyhow::bail!("[{section}] deselect must be an array of strings") - } - None => Vec::new(), - }; + let mut deselect = parse_deselect(kv, §ion, "deselect")?; + deselect.extend(parse_deselect( + kv, + §ion, + &format!("deselect_{}", std::env::consts::OS), + )?); let timeout_seconds = parse_timeout(kv, §ion)?; Ok(SelftestSpec { mode, @@ -331,6 +332,17 @@ impl Manifest { } } +/// A selftest's `key` deselect list (see [`SelftestSpec::deselect`]). +fn parse_deselect(kv: &simple_tables::Table, section: &str, key: &str) -> Result> { + match kv.get(key) { + Some(simple_tables::Value::List(items)) => Ok(items.clone()), + Some(simple_tables::Value::Str(_)) => { + anyhow::bail!("[{section}] {key} must be an array of strings") + } + None => Ok(Vec::new()), + } +} + fn parse_timeout(kv: &simple_tables::Table, section: &str) -> Result> { match kv .get("timeout_seconds") @@ -1949,6 +1961,46 @@ timeout_seconds = 900 assert_eq!(st.timeout_seconds, Some(900)); } + /// `deselect_` adds to `deselect` on that OS only. + #[test] + fn manifest_parses_os_scoped_deselect() { + let host = std::env::consts::OS; + let other = if host == "macos" { "linux" } else { "macos" }; + let body = format!( + "[packages.pkg]\nrequirements = \"pkg==1.0\"\nprobe = \"probes/pkg_probe.py\"\n\n\ + [packages.pkg.selftest]\nsource = \"pkg==1.0\"\ncommand = \"tests\"\n\ + deselect = [\"tests/test_a.py\"]\n\ + deselect_{host} = [\"tests/test_host.py::test_x\"]\n\ + deselect_{other} = [\"tests/test_other.py\"]\n" + ); + let m = Manifest::from_body(&body, Path::new(".")).unwrap(); + let st = m.rows[0].selftest.as_ref().expect("selftest spec"); + assert_eq!( + st.deselect, + vec!["tests/test_a.py", "tests/test_host.py::test_x"] + ); + } + + /// The checked-in manifest parses, and Pillow's macOS-only escape + /// applies on macOS alone. + #[test] + fn checked_in_manifest_scopes_pillow_avif_leak_to_macos() { + let path = + Path::new(env!("CARGO_MANIFEST_DIR")).join("../../tests/ecosystem/manifest.toml"); + let m = Manifest::load(&path).unwrap(); + let pillow = m + .rows + .iter() + .find(|r| r.name == "pillow") + .expect("pillow row"); + let st = pillow.selftest.as_ref().expect("pillow selftest"); + let avif = "Tests/test_file_avif.py::TestAvifLeaks::test_leak_load"; + assert_eq!( + st.deselect.iter().any(|d| d == avif), + std::env::consts::OS == "macos" + ); + } + /// The RFC 0075 WS9 overlay shape (lxml): installed mode carrying a /// pinned `source` whose sdist donates the test subtree. #[test] diff --git a/crates/weavepy-jit/src/analyze.rs b/crates/weavepy-jit/src/analyze.rs index 5421532e..6c42c23b 100644 --- a/crates/weavepy-jit/src/analyze.rs +++ b/crates/weavepy-jit/src/analyze.rs @@ -2010,7 +2010,7 @@ fn plan_rewrite( && ins[i - 2].arg == 0 && matches!(ins[i - 3].op, OpCode::LoadMethodAttr) && matches!(ins[i - 4].op, OpCode::LoadFast) - && code.names.get(ins[i - 3].arg as usize).map(String::as_str) == Some("items") + && code.names.get(ins[i - 3].arg as usize).map(|n| n.as_str()) == Some("items") { plan.pair_src .insert(i - 1, PairSrc::DictItems(ins[i - 4].arg)); @@ -2045,7 +2045,7 @@ fn plan_rewrite( // backwards: GET_ITER, CALL k, k simple args, PUSH_NULL, // LOAD_GLOBAL . if let Some((callee, push_null, step_nop, pops)) = range_prefix(code, &plan, &targets, i) { - let name = code.names[ins[callee].arg as usize].clone(); + let name = code.names[ins[callee].arg as usize].to_string(); if !plan.guards.iter().any(|g| g.name == name) { plan.guards.push(GlobalGuard { name, @@ -2352,7 +2352,7 @@ fn plan_rewrite( for (i, item) in ins.iter().enumerate() { if matches!(item.op, OpCode::LoadGlobal) && matches!( - code.names.get(item.arg as usize).map(String::as_str), + code.names.get(item.arg as usize).map(|n| n.as_str()), Some("eval" | "exec" | "locals" | "vars" | "dir" | "super" | "breakpoint") ) { @@ -2482,7 +2482,7 @@ fn plan_rewrite( let name = &code.names[ins[pc].arg as usize]; if !plan.guards.iter().any(|g| g.name == *name) { plan.guards.push(GlobalGuard { - name: name.clone(), + name: name.to_string(), expect, }); } @@ -2516,7 +2516,7 @@ fn plan_rewrite( plan.obj_globals.insert(item.arg, (token, lane)); if !plan.guards.iter().any(|g| g.name == *name) { plan.guards.push(GlobalGuard { - name: name.clone(), + name: name.to_string(), expect: ResolvedGlobal::ObjGlobal { token, lane }, }); } @@ -2531,7 +2531,7 @@ fn plan_rewrite( let name = &code.names[item.arg as usize]; if !plan.guards.iter().any(|g| g.name == *name) { plan.guards.push(GlobalGuard { - name: name.clone(), + name: name.to_string(), expect: resolved, }); } @@ -2545,7 +2545,7 @@ fn plan_rewrite( plan.obj_globals.insert(item.arg, (token, lane)); if !plan.guards.iter().any(|g| g.name == *name) { plan.guards.push(GlobalGuard { - name: name.clone(), + name: name.to_string(), expect: ResolvedGlobal::ObjGlobal { token, lane }, }); } @@ -3494,7 +3494,7 @@ impl CtorState { CtorFieldSrc::Param(j) => arg_lanes.get(j as usize).copied()?, CtorFieldSrc::Lane(l) => l, }; - Some((cls.clone(), field_idx, lane)) + Some((cls.to_string(), field_idx, lane)) } /// Record one same-body new-key attribute store on a direct local diff --git a/crates/weavepy-jit/src/engine.rs b/crates/weavepy-jit/src/engine.rs index bea1ef30..94c15cdc 100644 --- a/crates/weavepy-jit/src/engine.rs +++ b/crates/weavepy-jit/src/engine.rs @@ -583,56 +583,12 @@ impl JitEngine { }) } - /// Compile and discard a small counted loop, through the whole - /// pipeline a real compile takes (mid-end, register allocation, - /// emission, finalizing executable memory). A process's first compile - /// otherwise pays the code generator's cold start (its code paged in, - /// its tables built, the module's first memory mapped), about a - /// millisecond, on whatever hot loop first gets compiled. - pub fn warm_up(&mut self) { - use cranelift_codegen::ir::condcodes::IntCC; - use cranelift_codegen::ir::InstBuilder; - let int = types::I64; - self.ctx.func.signature.params.push(AbiParam::new(int)); - self.ctx.func.signature.returns.push(AbiParam::new(int)); - { - let mut b = - cranelift_frontend::FunctionBuilder::new(&mut self.ctx.func, &mut self.fbctx); - let entry = b.create_block(); - let head = b.create_block(); - let body = b.create_block(); - let exit = b.create_block(); - b.append_block_params_for_function_params(entry); - b.append_block_param(head, int); - b.append_block_param(head, int); - b.switch_to_block(entry); - let n = b.block_params(entry)[0]; - let zero = b.ins().iconst(int, 0); - b.ins().jump(head, &[zero.into(), zero.into()]); - b.switch_to_block(head); - let (i, acc) = (b.block_params(head)[0], b.block_params(head)[1]); - let more = b.ins().icmp(IntCC::SignedLessThan, i, n); - b.ins().brif(more, body, &[], exit, &[]); - b.switch_to_block(body); - let acc2 = b.ins().iadd(acc, i); - let i2 = b.ins().iadd_imm(i, 1); - b.ins().jump(head, &[i2.into(), acc2.into()]); - b.switch_to_block(exit); - b.ins().return_(&[acc]); - b.seal_all_blocks(); - b.finalize(); - } - let name = format!("wpjit_warm_{}", self.next_id); - self.next_id += 1; - let defined = self - .module - .declare_function(&name, Linkage::Local, &self.ctx.func.signature) - .ok() - .and_then(|id| self.module.define_function(id, &mut self.ctx).ok()); - self.module.clear_context(&mut self.ctx); - if defined.is_some() { - let _ = self.module.finalize_definitions(); - } + /// Drop the function and builder contexts for empty ones: clearing + /// them keeps their buffers' capacity, the largest function's size, + /// for the rest of the thread (and under the next compile's peak). + fn release(&mut self) { + self.ctx = self.module.make_context(); + self.fbctx = FunctionBuilderContext::new(); } /// Analyze and compile a code object. `resolve` reports what each @@ -718,19 +674,36 @@ impl JitEngine { inline_method: &mut dyn FnMut(u32, &[JitType], u32) -> Option, slot_member: &mut dyn FnMut(&AttrSiteMeta) -> bool, ) -> Result { - let mut tfunc = crate::analyze::analyze_frame(code, resolve, probes)?; - if calls_dynamically(&tfunc) { - return Err(JitVerdict::UnsupportedOpcode("dynamic call (loop-free)")); - } - if mostly_generic(&tfunc) { - return Err(JitVerdict::UnsupportedOpcode("mostly generic operations")); - } - for site in &mut tfunc.attr_sites { - site.slot_member = slot_member(site); - } + let tfunc = analyze_admitted(code, resolve, probes, slot_member)?; self.compile_tfunc_methods(&tfunc, direct, direct_method, inline_method) } + /// [`Self::compile_frame_direct`] on the engine in `engine`, built + /// (see [`Self::new`]) only once the analysis admits the code: code + /// the analysis rejects never pays for building one. When the host + /// can't have one, `engine` stays empty and the verdict is + /// [`NO_HOST_ENGINE`]. + #[allow(clippy::too_many_arguments)] + pub fn compile_frame_lazily( + engine: &mut Option, + code: &CodeObject, + resolve: &mut dyn FnMut(&str) -> ResolvedGlobal, + probes: &mut Probes<'_>, + direct: &mut dyn FnMut(u32) -> Option, + direct_method: &mut dyn FnMut(u32) -> Option, + inline_method: &mut dyn FnMut(u32, &[JitType], u32) -> Option, + slot_member: &mut dyn FnMut(&AttrSiteMeta) -> bool, + ) -> Result { + let tfunc = analyze_admitted(code, resolve, probes, slot_member)?; + if engine.is_none() { + *engine = JitEngine::new(); + } + let Some(engine) = engine.as_mut() else { + return Err(JitVerdict::UnsupportedOpcode(NO_HOST_ENGINE)); + }; + engine.compile_tfunc_methods(&tfunc, direct, direct_method, inline_method) + } + /// Compile an already-analyzed [`TFunc`] (also the unit-test entry). pub fn compile_tfunc(&mut self, tfunc: &TFunc) -> Result { self.compile_tfunc_direct(tfunc, &mut |_| None) @@ -1042,7 +1015,7 @@ impl JitEngine { inline_method, ); if !sound { - self.module.clear_context(&mut self.ctx); + self.release(); return Err(JitVerdict::NotConverged); } if std::env::var_os("WEAVEPY_JIT_CLIF_DUMP").is_some() { @@ -1067,11 +1040,10 @@ impl JitEngine { let _ = cranelift_codegen::timing::take_current(); } let t0 = stats.then(std::time::Instant::now); - self.module - .define_function(id, &mut self.ctx) - .map_err(|_| JitVerdict::NotConverged)?; + let defined = self.module.define_function(id, &mut self.ctx); let t1 = stats.then(std::time::Instant::now); - self.module.clear_context(&mut self.ctx); + self.release(); + defined.map_err(|_| JitVerdict::NotConverged)?; self.module .finalize_definitions() .map_err(|_| JitVerdict::NotConverged)?; @@ -1198,6 +1170,31 @@ fn calls_dynamically(tfunc: &TFunc) -> bool { /// through a helper that redoes the lookups the interpreter's caches /// remember, while each typed one saves only a dispatch. A loop-free /// body is left alone: other compiled code calls it directly. +/// The [`JitEngine::compile_frame_lazily`] verdict for a host the code +/// generator can't target. +pub const NO_HOST_ENGINE: &str = "no code generator for the host"; + +/// Analyze `code` for [`JitEngine::compile_frame_direct`] and apply the +/// admission rules that need no code generator. +fn analyze_admitted( + code: &CodeObject, + resolve: &mut dyn FnMut(&str) -> ResolvedGlobal, + probes: &mut Probes<'_>, + slot_member: &mut dyn FnMut(&AttrSiteMeta) -> bool, +) -> Result { + let mut tfunc = crate::analyze::analyze_frame(code, resolve, probes)?; + if calls_dynamically(&tfunc) { + return Err(JitVerdict::UnsupportedOpcode("dynamic call (loop-free)")); + } + if mostly_generic(&tfunc) { + return Err(JitVerdict::UnsupportedOpcode("mostly generic operations")); + } + for site in &mut tfunc.attr_sites { + site.slot_member = slot_member(site); + } + Ok(tfunc) +} + fn mostly_generic(tfunc: &TFunc) -> bool { let Some((percent, loops_only)) = generic_share_limit() else { return false; diff --git a/crates/weavepy-jit/src/lib.rs b/crates/weavepy-jit/src/lib.rs index e42d5f7c..ba2190d1 100644 --- a/crates/weavepy-jit/src/lib.rs +++ b/crates/weavepy-jit/src/lib.rs @@ -36,6 +36,7 @@ pub use analyze::{ }; pub use engine::{ admit_generic_loops, CompiledFrame, DirectLeaf, FieldAt, InlineMethod, JitEngine, OpMix, + NO_HOST_ENGINE, }; pub use ir::{ ArithKind, AttrSiteMeta, BlockId, CalleeSpanMeta, CmpKind, CompSavedMeta, CtorFieldSrc, diff --git a/crates/weavepy-vm/src/builtin_types.rs b/crates/weavepy-vm/src/builtin_types.rs index dca1ca9d..04f197ef 100644 --- a/crates/weavepy-vm/src/builtin_types.rs +++ b/crates/weavepy-vm/src/builtin_types.rs @@ -4483,7 +4483,16 @@ pub(crate) fn exc_init(args: &[Object]) -> Result { if is_subclass_by_name(&inst_rc.cls(), "StopIteration") { inst_rc.slot_set("value", rest.first().cloned().unwrap_or(Object::None)); } - inst_rc.slot_set("args", Object::new_tuple(rest)); + // Only a non-atomic argument can close a cycle through the + // instance (as at construction, see `build_exception_instance`). + if rest.iter().any(|x| !crate::gc_trace::is_atomic(x)) { + inst_rc.ensure_gc_tracked(); + } + let old = inst_rc + .slots + .borrow_mut() + .insert("args", Object::new_tuple(rest)); + drop(old); } Ok(Object::None) } @@ -4869,12 +4878,24 @@ pub fn make_exception_with_class(class: Rc, message: impl Into, arg: Option) -> Object { + exception_from_parts_with(class, arg, []) +} + +/// [`exception_from_parts`] with the further pseudo-slots `extra`, in +/// order, after the families' own (`AttributeError`'s `name` and `obj`): +/// the instance's slots are built once, with no per-slot probe. +pub(crate) fn exception_from_parts_with( + class: Rc, + arg: Option, + extra: [(&'static str, Object); N], +) -> Object { use crate::types::{slot_key, PyInstance, SlotStorage}; let families = crate::exc_family_flags(&class); let inst = PyInstance::new(class); @@ -4883,41 +4904,50 @@ pub(crate) fn exception_from_parts(class: Rc, arg: Option) - Some(a) => Object::new_tuple_array([a.clone()]), }; inst.note_slot_store(&args); - let mut entries: Vec<(crate::object::DictKey, Object)> = Vec::with_capacity(4); // PEP 380: `StopIteration.value` is always present (CPython sets it // in `StopIteration.__init__`, defaulting to None). A Rust-raised // bare `StopIteration` must answer `.value` too: asyncio's // `Task.__step` reads `exc.value` on every coroutine return, and a // missing attribute leaves the task wedged (gh: shutdown_asyncgens). - if families & crate::EXC_FAM_STOP_ITERATION != 0 { - let value = arg.clone().unwrap_or(Object::None); - inst.note_slot_store(&value); - entries.push((slot_key("value"), value)); - } - entries.push((slot_key("args"), args)); + let value = (families & crate::EXC_FAM_STOP_ITERATION != 0) + .then(|| arg.clone().unwrap_or(Object::None)); // The BaseException pseudo-slots (`__context__`/`__cause__`/ // `__suppress_context__`/`__traceback__`) and OSError's named fields // (`errno`/`strerror`/…) are *not* seeded per-instance: their class // slot descriptors answer the CPython getset defaults while unset, // and a subclass's own class attribute (`class Err(OSError): errno = // EINVAL`, raised bare via `raise Err`) stays visible. - if families & (crate::EXC_FAM_IMPORT_ERROR | crate::EXC_FAM_SYNTAX_ERROR) != 0 { - // ImportError/ModuleNotFoundError expose `msg` (the message - // string). CPython always defines the slot; a Rust-raised - // ImportError must answer `.msg` so consumers (e.g. numpy's - // `_core/__init__` error handling, which reads `exc.msg`) don't - // AttributeError. `name`/`path`/`name_from` are intentionally - // *not* pre-set here so the import machinery's - // `set_exception_attr` (which skips already-present slots) can - // still populate the real module name. SyntaxError gets `msg` - // from `args[0]` too; the location payload reads `None` off the - // class descriptors until `error::syntax_error_located` fills - // real values. - let msg = arg.unwrap_or_else(|| Object::from_static("")); - inst.note_slot_store(&msg); - entries.push((slot_key("msg"), msg)); - } - *inst.slots.borrow_mut() = SlotStorage::from_entries(entries); + // + // ImportError/ModuleNotFoundError expose `msg` (the message + // string). CPython always defines the slot; a Rust-raised + // ImportError must answer `.msg` so consumers (e.g. numpy's + // `_core/__init__` error handling, which reads `exc.msg`) don't + // AttributeError. `name`/`path`/`name_from` are intentionally + // *not* pre-set here so the import machinery's + // `set_exception_attr` (which skips already-present slots) can + // still populate the real module name. SyntaxError gets `msg` + // from `args[0]` too; the location payload reads `None` off the + // class descriptors until `error::syntax_error_located` fills + // real values. + let msg = (families & (crate::EXC_FAM_IMPORT_ERROR | crate::EXC_FAM_SYNTAX_ERROR) != 0) + .then(|| arg.unwrap_or_else(|| Object::from_static(""))); + for v in value.iter().chain(&msg).chain(extra.iter().map(|(_, v)| v)) { + inst.note_slot_store(v); + } + let slots = match (value, msg) { + (None, None) => SlotStorage::exception(args, extra), + (Some(value), None) if N == 0 => SlotStorage::exception(args, [("value", value)]), + (None, Some(msg)) if N == 0 => SlotStorage::exception(args, [("msg", msg)]), + (value, msg) => { + let mut entries = Vec::with_capacity(N + 3); + entries.push((slot_key("args"), args)); + entries.extend(value.map(|v| (slot_key("value"), v))); + entries.extend(msg.map(|m| (slot_key("msg"), m))); + entries.extend(extra.into_iter().map(|(k, v)| (slot_key(k), v))); + SlotStorage::from_entries(entries) + } + }; + *inst.slots.borrow_mut() = slots; Object::Instance(Rc::new(inst)) } diff --git a/crates/weavepy-vm/src/builtins.rs b/crates/weavepy-vm/src/builtins.rs index 94637a4b..913a64ac 100644 --- a/crates/weavepy-vm/src/builtins.rs +++ b/crates/weavepy-vm/src/builtins.rs @@ -517,6 +517,10 @@ pub(crate) fn method_memo_tag(obj: &Object) -> Option { Object::File(f) if f.extra_attrs.borrow().is_empty() => { 16 + (f.io_kind.get() as u8) * 4 + u8::from(f.binary) * 2 + u8::from(f.is_memory()) } + // A class's `__dict__` view (`cls.__dict__.get(name)`, as enum and + // `inspect` read it). A view over another mapping + // (`MappingProxyObj`) calls that mapping's own methods instead. + Object::MappingProxy(_) => 120, _ => return None, }; Some(tag) @@ -4306,14 +4310,26 @@ pub(crate) fn code_synthetic_attr( c: &Rc, name: &str, ) -> Option { + let ident = |k: usize| { + crate::code_vm_ext(c).map(|ext| { + ext.ident_strs.get_or_init(|| { + [ + Object::from_str(&c.name), + Object::from_str(if c.qualname.is_empty() { + &c.name + } else { + &c.qualname + }), + Object::from_str(&*c.filename), + ] + })[k] + .clone() + }) + }; match name { - "co_name" | "__name__" => Some(Object::from_str(&c.name)), - "co_qualname" | "__qualname__" => Some(Object::from_str(if c.qualname.is_empty() { - &c.name - } else { - &c.qualname - })), - "co_filename" => Some(Object::from_str(&*c.filename)), + "co_name" | "__name__" => ident(0), + "co_qualname" | "__qualname__" => ident(1), + "co_filename" => ident(2), "co_argcount" => Some(Object::Int(i64::from(c.arg_count))), "co_posonlyargcount" => Some(Object::Int(i64::from(c.posonly_count))), "co_kwonlyargcount" => Some(Object::Int(i64::from(c.kwonly_count))), @@ -4554,17 +4570,17 @@ fn code_replace(args: &[Object], kwargs: &[(String, Object)]) -> Result = None; for (k, v) in kwargs { match k.as_str() { - "co_name" => nc.name = want_str(v, "co_name")?, - "co_qualname" => nc.qualname = want_str(v, "co_qualname")?, + "co_name" => nc.name = want_str(v, "co_name")?.into(), + "co_qualname" => nc.qualname = want_str(v, "co_qualname")?.into(), "co_filename" => nc.filename = want_str(v, "co_filename")?.into(), "co_argcount" => nc.arg_count = want_u32(v, "co_argcount")?, "co_posonlyargcount" => nc.posonly_count = want_u32(v, "co_posonlyargcount")?, "co_kwonlyargcount" => nc.kwonly_count = want_u32(v, "co_kwonlyargcount")?, "co_nlocals" => requested_nlocals = Some(want_u32(v, "co_nlocals")?), - "co_varnames" => nc.varnames = want_str_seq(v, "co_varnames")?, - "co_names" => nc.names = want_str_seq(v, "co_names")?, - "co_freevars" => nc.freevars = want_str_seq(v, "co_freevars")?, - "co_cellvars" => nc.cellvars = want_str_seq(v, "co_cellvars")?, + "co_varnames" => nc.varnames = names_of(want_str_seq(v, "co_varnames")?), + "co_names" => nc.names = names_of(want_str_seq(v, "co_names")?), + "co_freevars" => nc.freevars = names_of(want_str_seq(v, "co_freevars")?), + "co_cellvars" => nc.cellvars = names_of(want_str_seq(v, "co_cellvars")?), "co_stacksize" => { nc.wire.get_or_insert_with(Default::default).stacksize = Some(want_u32(v, "co_stacksize")?); @@ -4712,10 +4728,10 @@ pub fn foreign_code_object( const CO_ITERABLE_COROUTINE: u32 = 0x0100; const CO_ASYNC_GENERATOR: u32 = 0x0200; let mut nc = weavepy_compiler::CodeObject { - name, - qualname, + name: name.into(), + qualname: qualname.into(), filename: filename.into(), - varnames, + varnames: names_of(varnames), arg_count, posonly_count, kwonly_count, @@ -4737,6 +4753,11 @@ pub fn foreign_code_object( Object::Code(Rc::new(nc)) } +/// A code object's name table from a constructor or `replace()` argument. +fn names_of(names: Vec) -> Vec { + names.iter().map(weavepy_compiler::Name::from).collect() +} + /// Pin raw CPython `co_code` bytes on `nc` (RFC 0060 — `CodeType(...)` / /// `replace(co_code=…)`). When the stream decodes back into WeavePy /// instructions the code object stays executable; otherwise executing it @@ -4906,14 +4927,14 @@ pub(crate) fn code_type_call( const CO_ITERABLE_COROUTINE: u32 = 0x0100; const CO_ASYNC_GENERATOR: u32 = 0x0200; let mut nc = weavepy_compiler::CodeObject { - name, - qualname, + name: name.into(), + qualname: qualname.into(), filename: filename.into(), constants, - names, - varnames, - freevars, - cellvars, + names: names_of(names), + varnames: names_of(varnames), + freevars: names_of(freevars), + cellvars: names_of(cellvars), arg_count, posonly_count, kwonly_count, @@ -5008,33 +5029,51 @@ fn code_co_positions(args: &[Object]) -> Result { .collect(); return list_iter(items); } - let cp = c.to_cpython(); let debug_ranges = crate::vm_singletons::debug_ranges(); - let col = |v: Option| { - v.filter(|_| debug_ranges) - .map_or(Object::None, |x| Object::Int(i64::from(x))) + let build = || -> Vec { + let cp = c.to_cpython(); + let col = |v: Option| { + v.filter(|_| debug_ranges) + .map_or(Object::None, |x| Object::Int(i64::from(x))) + }; + let line = |v: i32| { + // -1 marks NO_LOCATION; 0 is a real line (module RESUME). + if v < 0 { + Object::None + } else { + Object::Int(i64::from(v)) + } + }; + cp.positions + .iter() + .map(|p| { + // A NO_LOCATION unit (lineno 0) reports all-None (PEP 657). + // With debug ranges disabled only start lines survive, so + // end_line collapses onto line (CPython stores no + // end-position table; test_endline_and_columntable_none_…). + let end_lineno = if debug_ranges { p.end_lineno } else { p.lineno }; + Object::new_tuple_array([ + line(p.lineno), + line(end_lineno), + col(p.col), + col(p.end_col), + ]) + }) + .collect() }; - let line = |v: i32| { - // -1 marks NO_LOCATION; 0 is a real line (module RESUME). - if v < 0 { - Object::None - } else { - Object::Int(i64::from(v)) + // The tuples are built once per code object (`traceback` asks for + // every frame's, then reads one entry): an iterator over one shared + // immutable tuple of them. + if let Some(ext) = crate::code_vm_ext(&c) { + let (ranges, all) = ext + .positions + .get_or_init(|| (debug_ranges, Object::new_tuple(build()))); + if *ranges == debug_ranges { + let it = all.make_iter()?; + return Ok(Object::Iter(Rc::new(RefCell::new(it)))); } - }; - let items = cp - .positions - .iter() - .map(|p| { - // A NO_LOCATION unit (lineno 0) reports all-None (PEP 657). - // With debug ranges disabled only start lines survive, so - // end_line collapses onto line (CPython stores no - // end-position table; test_endline_and_columntable_none_…). - let end_lineno = if debug_ranges { p.end_lineno } else { p.lineno }; - Object::new_tuple_array([line(p.lineno), line(end_lineno), col(p.col), col(p.end_col)]) - }) - .collect(); - list_iter(items) + } + list_iter(build()) } /// Wrap a vector of objects as a single-use iterator, mirroring the @@ -5309,6 +5348,7 @@ fn attr_set(obj: &Object, name: &str, value: Object) -> Result<(), RuntimeError> ))); } *f.code.borrow_mut() = c; + f.names_kept.set(0); } else if crate::object::is_function_slot(name) { f.set_slot(name, value); } else { @@ -6009,6 +6049,36 @@ fn float_as_integer_ratio(args: &[Object]) -> Result { let sign = if (bits >> 63) & 1 == 1 { -1i32 } else { 1 }; let exp_field = ((bits >> 52) & 0x7FF) as i32; let mantissa_field = bits & ((1u64 << 52) - 1); + // Machine-word answer when both terms fit an `i64` (every float of + // magnitude below 2**10 with few fraction bits, the statistics + // module's common case): the denominator is a power of two, so + // lowest terms only strip the mantissa's trailing zeros. + { + let (m, e) = if exp_field == 0 { + (mantissa_field, -1074) + } else { + ((1u64 << 52) | mantissa_field, exp_field - 1075) + }; + if m == 0 { + return Ok(Object::new_tuple_array([Object::Int(0), Object::Int(1)])); + } + let small = if e >= 0 { + // `m < 2**53`, so the shift stays below 2**63 while `e <= 9`. + (e <= 9).then(|| (i64::try_from(m << e).ok(), Some(1i64))) + } else { + let shift = m.trailing_zeros().min(e.unsigned_abs()); + let m = m >> shift; + let e = e + shift as i32; + (e > -63).then(|| (i64::try_from(m).ok(), Some(1i64 << -e))) + }; + if let Some((Some(num), Some(den))) = small { + let num = if sign < 0 { -num } else { num }; + return Ok(Object::new_tuple_array([ + Object::Int(num), + Object::Int(den), + ])); + } + } let (mantissa, exponent): (BigInt, i32) = if exp_field == 0 { // Subnormal. (BigInt::from(mantissa_field), -1074) @@ -8720,6 +8790,7 @@ pub(crate) fn make_unbound_super(class: Rc) -> Object finalize_ran: crate::sync::Cell::new(false), deferred: crate::sync::Cell::new(false), c_body: crate::types::CBody::default(), + gc_slot: crate::gc_trace::GcSlot::new(), }; Object::Instance(Rc::new(inst)) } @@ -8799,6 +8870,7 @@ pub(crate) fn build_super_proxy( finalize_ran: crate::sync::Cell::new(false), deferred: crate::sync::Cell::new(false), c_body: crate::types::CBody::default(), + gc_slot: crate::gc_trace::GcSlot::new(), }; Object::Instance(Rc::new(inst)) } @@ -10608,6 +10680,8 @@ fn b_mark_iterable_coroutine(args: &[Object]) -> Result { closure_cells: std::sync::OnceLock::new(), // The copied slot store carries any override along. defaults_override: crate::object::OverrideFlag::new(f.defaults_maybe_overridden()), + names_kept: crate::sync::Cell::new(0), + gc_slot: crate::gc_trace::GcSlot::new(), }; Ok(Object::Function(Rc::new(marked))) } @@ -11008,7 +11082,59 @@ fn str_casefold(args: &[Object]) -> Result { Ok(str_result(args, out)) } +/// `strip`/`lstrip`/`rstrip` of an exact `str` by whitespace or by a set +/// of ASCII characters, scanning bytes: the receiver itself when nothing +/// goes, else one allocation. `None` for the general path (a non-ASCII +/// set, or a non-ASCII character at an edge whitespace stripping reaches). +fn strip_fast(args: &[Object], left: bool, right: bool) -> Option { + let (Some(Object::Str(s)), true) = (args.first(), args.len() <= 2) else { + return None; + }; + let spaces = matches!(args.get(1), None | Some(Object::None)); + let mut set = [false; 128]; + match args.get(1) { + None | Some(Object::None) => set = *ascii_space_table(), + Some(Object::Str(chars)) if chars.is_ascii() => { + for &c in chars.as_bytes() { + set[usize::from(c)] = true; + } + } + _ => return None, + } + let b = s.as_bytes(); + let strips = |c: u8| c < 0x80 && set[usize::from(c)]; + let (mut lo, mut hi) = (0, b.len()); + if left { + while lo < hi && strips(b[lo]) { + lo += 1; + } + } + if right { + while hi > lo && strips(b[hi - 1]) { + hi -= 1; + } + } + // (A non-ASCII character may be Unicode whitespace.) + if spaces && ((left && lo < hi && b[lo] >= 0x80) || (right && hi > lo && b[hi - 1] >= 0x80)) { + return None; + } + if lo == 0 && hi == b.len() { + return Some(args[0].clone()); + } + // (The shortest results are the shared ones `SharedStr::from` hands + // out, as `str_result` would.) + let ascii = hi - lo > 2 && SharedStr::char_count(s) == b.len(); + Some(Object::Str(if ascii { + SharedStr::from_ascii(&s[lo..hi]) + } else { + SharedStr::from(&s[lo..hi]) + })) +} + fn str_strip(args: &[Object]) -> Result { + if let Some(out) = strip_fast(args, true, true) { + return Ok(out); + } str_arity("strip", args, 0, 1)?; let s = str_self(args)?; let out = match args.get(1) { @@ -11321,7 +11447,7 @@ fn str_startswith(args: &[Object]) -> Result { Some(obj) => obj, None => return Err(type_error("startswith() takes at least 1 argument")), }; - let slice = str_apply_start_end(s.as_ref(), args.get(2), args.get(3))?; + let slice = str_apply_start_end(s.as_ref(), args.get(2), args.get(3), ascii_receiver(args))?; match slice { Some(slice) => Ok(Object::Bool(str_match_prefix_suffix(slice, target, true)?)), None => Ok(Object::Bool(false)), @@ -11335,13 +11461,28 @@ fn str_endswith(args: &[Object]) -> Result { Some(obj) => obj, None => return Err(type_error("endswith() takes at least 1 argument")), }; - let slice = str_apply_start_end(s.as_ref(), args.get(2), args.get(3))?; + let slice = str_apply_start_end(s.as_ref(), args.get(2), args.get(3), ascii_receiver(args))?; match slice { Some(slice) => Ok(Object::Bool(str_match_prefix_suffix(slice, target, false)?)), None => Ok(Object::Bool(false)), } } +/// Whether a `str` method's receiver is known to be pure ASCII, so a +/// character index is a byte index. A long receiver's code points are +/// counted once (the count is memoized on the string); a scan per call +/// would make `s.startswith(x, pos)` linear in `pos`, as tomllib's +/// tokenizer calls it at every position. +fn ascii_receiver(args: &[Object]) -> bool { + match args.first() { + Some(Object::Str(t)) => { + crate::shared_value::SharedStr::known_char_count(t) == Some(t.len()) + || (t.len() > 64 && crate::shared_value::SharedStr::is_ascii(t)) + } + _ => false, + } +} + /// Resolve start/end for `startswith`/`endswith` like CPython's /// `tailmatch` + `ADJUST_INDICES`: `end` clamps to the length, but /// `start` is only floored at 0 — a start beyond the (adjusted) end @@ -11351,6 +11492,7 @@ fn str_apply_start_end<'a>( s: &'a str, start: Option<&Object>, end: Option<&Object>, + ascii: bool, ) -> Result, RuntimeError> { // The common unbounded check only needs to inspect the needle. In // particular, json.loads checks for a BOM this way on the whole input. @@ -11390,7 +11532,7 @@ fn str_apply_start_end<'a>( } let index = usize::try_from(index).ok()?; let prefix = text.as_bytes().get(..index)?; - if prefix.is_ascii() { + if ascii || prefix.is_ascii() { Some(index) } else { text.char_indices() @@ -11676,6 +11818,11 @@ pub(crate) fn substr_find(hay: &str, needle: &str) -> Option { if n.is_empty() { return Some(0); } + // One ASCII byte in a short string (`d in "123456789"`): a plain scan + // costs less than `memchr`'s set-up. + if let ([byte], true) = (n, h.len() <= 16) { + return h.iter().position(|c| c == byte); + } if n.len() > 16 || h.len() < n.len() { return hay.find(needle); } @@ -11929,6 +12076,9 @@ fn str_swapcase(args: &[Object]) -> Result { } fn str_lstrip(args: &[Object]) -> Result { + if let Some(out) = strip_fast(args, true, false) { + return Ok(out); + } str_arity("lstrip", args, 0, 1)?; let s = str_self(args)?; let out = match args.get(1) { @@ -11949,6 +12099,9 @@ fn str_lstrip(args: &[Object]) -> Result { } fn str_rstrip(args: &[Object]) -> Result { + if let Some(out) = strip_fast(args, false, true) { + return Ok(out); + } str_arity("rstrip", args, 0, 1)?; let s = str_self(args)?; let out = match args.get(1) { @@ -12526,6 +12679,9 @@ fn str_encode(args: &[Object], kwargs: &[(String, Object)]) -> Result { matches!(&**enc, "utf-8" | "utf8" | "UTF-8" | "UTF8" | "utf_8") } + [_, Object::Str(enc), errors] if is_builtin_error_handler(errors) => { + matches!(&**enc, "utf-8" | "utf8" | "UTF-8" | "UTF8" | "utf_8") + } _ => false, }; if utf8 { @@ -12631,9 +12787,12 @@ fn str_translate(args: &[Object]) -> Result { )) } }; - let mut out = String::new(); + let mut out = String::with_capacity(s.len()); let receiver_bridged = matches!(args.first(), Some(Object::WStr(_))); let mut saw_surrogate = receiver_bridged; + // Each ASCII character's entry, looked up once per call (CPython's + // `unicode_fast_translate` caches its ASCII table the same way). + let mut ascii_memo: [Option>; 128] = std::array::from_fn(|_| None); // Push a translation target code point, bridging a surrogate so it // round-trips through `str_result`. let push_cp = |out: &mut String, cp: u32, saw: &mut bool| { @@ -12658,13 +12817,17 @@ fn str_translate(args: &[Object]) -> Result { } else { cp }; - let entry = match &table { + let lookup = |cp: u32| match &table { Table::Dict(Object::Dict(d)) => d .borrow() - .get(&DictKey(Object::Int(i64::from(real_cp)))) + .get(&DictKey(Object::Int(i64::from(cp)))) .cloned(), Table::Dict(_) => None, - Table::Seq(v) => v.get(real_cp as usize).cloned(), + Table::Seq(v) => v.get(cp as usize).cloned(), + }; + let entry = match ascii_memo.get_mut(real_cp as usize) { + Some(slot) => slot.get_or_insert_with(|| lookup(real_cp)).clone(), + None => lookup(real_cp), }; match entry { Some(Object::None) => {} @@ -13020,11 +13183,18 @@ fn list_insert(args: &[Object]) -> Result { if args.len() != 3 { return Err(type_error("list.insert() expected 2 arguments")); } + let l = list_self(args)?; + // CPython converts the index with `PyNumber_AsSsize_t`: `__index__`, + // an `OverflowError` past `Py_ssize_t`. let i = match &args[1] { Object::Int(i) => *i, - _ => return Err(type_error("insert index must be int")), + Object::Long(_) => { + return Err(crate::error::overflow_error( + "Python int too large to convert to C ssize_t", + )) + } + other => coerce_index_i64(other)?, }; - let l = list_self(args)?; let mut l = l.borrow_mut(); let len = l.len() as i64; let idx = if i < 0 { @@ -13440,21 +13610,25 @@ pub(crate) fn dict_insert_exact( let Ok(mut m) = d.try_borrow_mut() else { return Err((key, value)); }; - if let Some(slot) = m.get_mut(&probe) { - let replaced = !slot.is_same(&value); - let old = std::mem::replace(slot, value); - drop(m); - // (Re-storing the identical object is no change; PEP 509.) - if replaced { - crate::object::dict_mutation_event(d); + let vacancy = match m.probe_entry(&probe) { + crate::dictmap::ProbeEntry::Occupied(e) => { + let slot = e.into_mut(); + let replaced = !slot.is_same(&value); + let old = std::mem::replace(slot, value); + drop(m); + // (Re-storing the identical object is no change; PEP 509.) + if replaced { + crate::object::dict_mutation_event(d); + } + return Ok(Some(old)); } - return Ok(Some(old)); - } + crate::dictmap::ProbeEntry::Vacant(e) => e, + }; if !probe.miss_is_exact() { drop(m); return Err((key, value)); } - m.insert(DictKey(key), value); + vacancy.insert(DictKey(key), value); drop(m); crate::object::dict_watch_bump(d); crate::object::dict_mutation_event(d); @@ -13541,6 +13715,26 @@ pub(crate) fn dict_remove( d: &Rc>, key: &Object, ) -> Result, RuntimeError> { + // A `str` or `int` key settles by native equality: one probe, with no + // comparison scope (see `dict_lookup`). + if let Some(probe) = crate::object::LeafProbe::new(key) { + if let Ok(mut m) = d.try_borrow_mut() { + match m.get_index_of(&probe) { + Some(i) => { + let (k, v) = m.shift_remove_index(i).expect("found above"); + drop(m); + crate::object::dict_watch_bump(d); + crate::object::dict_mutation_event(d); + if crate::capi_watchers::dicts_active() { + crate::capi_watchers::dict_event("DELETED", d, Some(key), None); + } + return Ok(Some((k.0, v))); + } + None if probe.miss_is_exact() => return Ok(None), + None => {} + } + } + } if crate::object::dict_key_is_reentrant(key) { return crate::object::dict_reentrant_remove(d, key); } @@ -13638,6 +13832,13 @@ fn plain_codec(name: Option<&Object>) -> Option { if n.len() > 10 { return None; } + // The spellings code writes, without the normalizing copy. + match n { + "utf-8" | "utf8" => return Some(PlainCodec::Utf8), + "ascii" => return Some(PlainCodec::Ascii), + "latin-1" | "latin1" => return Some(PlainCodec::Latin1), + _ => {} + } let n = n.to_ascii_lowercase().replace('_', "-"); Some(match n.as_str() { "utf-8" | "utf8" => PlainCodec::Utf8, @@ -13647,13 +13848,31 @@ fn plain_codec(name: Option<&Object>) -> Option { }) } +/// One of the codec error handlers every interpreter registers. A +/// conversion that meets no error never consults its handler, so a leaf +/// half that only serves error-free conversions may accept any of these +/// (an unknown name is left to the full path, which owns its checks). +fn is_builtin_error_handler(o: &Object) -> bool { + matches!(o, Object::Str(e) if matches!( + &**e, + "strict" + | "ignore" + | "replace" + | "surrogateescape" + | "surrogatepass" + | "backslashreplace" + | "xmlcharrefreplace" + | "namereplace" + )) +} + /// `s.encode([encoding])` with a plain codec, when every character /// encodes (an unencodable one raises on the full path). pub(crate) fn str_encode_leaf(args: &[Object]) -> Option> { let (Object::Str(s), rest) = args.split_first()? else { return None; }; - if rest.len() > 1 { + if rest.len() > 1 && !(rest.len() == 2 && is_builtin_error_handler(&rest[1])) { return None; } let s: &str = s; @@ -13675,7 +13894,7 @@ pub(crate) fn bytes_decode_leaf(args: &[Object]) -> Option 1 { + if rest.len() > 1 && !(rest.len() == 2 && is_builtin_error_handler(&rest[1])) { return None; } let text = match plain_codec(rest.first())? { @@ -13744,17 +13963,17 @@ pub(crate) fn dict_setitem_leaf(args: &[Object]) -> Option { - let old = std::mem::replace(slot, value.clone()); + let (old, changed, added) = match d.probe_entry(&probe) { + crate::dictmap::ProbeEntry::Occupied(e) => { + let old = std::mem::replace(e.into_mut(), value.clone()); let changed = !old.is_same(value); (Some(old), changed, false) } - None => { + crate::dictmap::ProbeEntry::Vacant(e) => { if !probe.miss_is_exact() { return None; } - d.insert(DictKey(key.clone()), value.clone()); + e.insert(DictKey(key.clone()), value.clone()); (None, true, true) } }; @@ -16940,8 +17159,10 @@ pub(crate) fn file_write(args: &[Object]) -> Result { } // Text writes commit fully and report the *character* count // (CPython `TextIOWrapper.write`), never a partial byte tally. - f.write_text_all(&f.encode_text(s)?)?; - s.chars().count() + if !f.mem_text_append(s) { + f.write_text_all(&f.encode_text(s)?)?; + } + crate::object::str_char_len(s) } // A surrogate-bearing `str`. For an in-memory `StringIO` the lone // surrogates ride through the PUA bridge so they round-trip; a real diff --git a/crates/weavepy-vm/src/capi_watchers.rs b/crates/weavepy-vm/src/capi_watchers.rs index a3a343ca..0e1b6d7e 100644 --- a/crates/weavepy-vm/src/capi_watchers.rs +++ b/crates/weavepy-vm/src/capi_watchers.rs @@ -21,11 +21,11 @@ use parking_lot::Mutex; use std::sync::atomic::{AtomicBool, Ordering}; /// Any dict currently watched? -static DICTS_ACTIVE: AtomicBool = AtomicBool::new(false); +static DICTS_ACTIVE: &AtomicBool = &crate::sync::RELEASE_GATES.dicts_watched; /// Any type currently watched? static TYPES_ACTIVE: AtomicBool = AtomicBool::new(false); /// Any function watcher registered? -static FUNCS_ACTIVE: AtomicBool = AtomicBool::new(false); +static FUNCS_ACTIVE: &AtomicBool = &crate::sync::RELEASE_GATES.funcs_watched; /// A watched dict: identity pointer, the bitmask of watcher IDs watching /// it, and a keep-check `Weak` so a stale entry (the dict died on a path @@ -100,16 +100,6 @@ fn call_dispatcher(cb: &Object, args: Vec) { // ---------------------------------------------------------------- dicts -#[inline(always)] -/// The dict and function watcher flags' bytes (nonzero while any is -/// registered), for compiled code that tests them in line. -pub(crate) fn release_flags() -> [*const u8; 2] { - [ - DICTS_ACTIVE.as_ptr().cast_const().cast(), - FUNCS_ACTIVE.as_ptr().cast_const().cast(), - ] -} - pub fn dicts_active() -> bool { DICTS_ACTIVE.load(Ordering::Relaxed) } diff --git a/crates/weavepy-vm/src/dictmap.rs b/crates/weavepy-vm/src/dictmap.rs new file mode 100644 index 00000000..ea6c9e4b --- /dev/null +++ b/crates/weavepy-vm/src/dictmap.rs @@ -0,0 +1,1806 @@ +//! The insertion-ordered hash table behind every Python `dict`. +//! +//! The layout follows CPython's compact dict: a dense vector of entries in +//! insertion order, each carrying its key's Python hash, plus a sparse +//! table of slots that point into it. A table of at most [`SMALL`] entries +//! has no slots at all: a probe scans the entries, comparing hashes first, +//! so the commonest dicts (keyword arguments, small literals, instance +//! dictionaries) are one allocation. +//! +//! A slot is one word: the entry's index plus one in the low half (zero +//! marks an empty slot) and the high half of the mixed hash (the key's +//! Python hash times a Fibonacci constant) above it. The top bits of the +//! mixed hash pick the home slot, and collisions probe linearly; a probe +//! compares the slot's half-hash before it touches an entry, and an entry +//! only when the full stored hash matches, so a key's `__eq__` runs only +//! against keys of equal hash, as in CPython. Removal shifts the run that +//! follows a freed slot back over it, so there are no tombstones. +//! +//! Positions are dense: removing an entry shifts the later ones down, so +//! `get_index(i)` is always the `i`-th key in order (the contract the +//! iterators and the position caches rely on). +//! +//! A lookup takes any [`Probe`]: a stored key's own type, or one of the +//! borrowed probes in [`crate::object`] (a `&str` name, a native-equality +//! leaf probe) that hash and compare without building an `Object`. + +use crate::object::{DictKey, Object}; +use std::fmt; + +/// The most entries a table keeps without slots. +pub const SMALL: usize = 8; + +/// The Fibonacci multiplier that mixes a Python hash into slot bits. +const MIX: u64 = 0x9E37_79B9_7F4A_7C15; + +/// The low half of a slot: the entry index plus one. +const IX_MASK: u64 = 0xFFFF_FFFF; + +/// A stored entry: the key's Python hash, the key, and its value. +#[derive(Clone, Debug)] +pub struct Bucket { + pub(crate) hash: i64, + pub key: DictKey, + pub value: V, +} + +/// A key a table can be probed with: its Python hash and its equality with +/// a stored key of the same hash. +pub trait Probe { + /// The probe's Python hash. + fn probe_hash(&self) -> i64; + /// Whether the probe equals `stored` (whose hash equals the probe's). + fn probe_eq(&self, stored: &DictKey) -> bool; + + /// Whether the probe equals `stored` whatever its hash, when that is + /// settled natively and costs less than hashing the probe; `None` + /// when the hashes must be compared first. A small table is scanned + /// with this before the probe is hashed (a `str` probe whose hash + /// isn't known compares bytes instead of hashing them). + #[inline(always)] + fn probe_eq_unhashed(&self, _stored: &DictKey) -> Option { + None + } +} + +impl Probe for DictKey { + #[inline] + fn probe_hash(&self) -> i64 { + crate::object::dict_key_hash(&self.0) + } + + #[inline] + fn probe_eq(&self, stored: &DictKey) -> bool { + self == stored + } + + #[inline] + fn probe_eq_unhashed(&self, stored: &DictKey) -> Option { + // A new string (its hash not yet computed) compares with the + // stored strings instead. + match (&self.0, &stored.0) { + (Object::Str(a), Object::Str(b)) + if crate::shared_value::SharedStr::known_hash(a).is_none() => + { + Some(a.as_bytes() == b.as_bytes()) + } + (Object::Str(a), Object::WStr(_)) + if crate::shared_value::SharedStr::known_hash(a).is_none() => + { + Some(false) + } + _ => None, + } + } +} + +impl Probe for &P { + #[inline] + fn probe_hash(&self) -> i64 { + (**self).probe_hash() + } + + #[inline] + fn probe_eq(&self, stored: &DictKey) -> bool { + (**self).probe_eq(stored) + } + + #[inline] + fn probe_eq_unhashed(&self, stored: &DictKey) -> Option { + (**self).probe_eq_unhashed(stored) + } +} + +/// Byte equality for key strings, in line: a probe that meets an equal +/// stored string of another object compares a few words instead of +/// calling `memcmp` (keys are mostly short names). +#[inline(always)] +pub fn key_bytes_eq(a: &[u8], b: &[u8]) -> bool { + let n = a.len(); + if n != b.len() { + return false; + } + // SAFETY: every read is inside both slices (`n` bytes each): the two + // loads of a width overlap when `n` is below twice it. + unsafe { + let (p, q) = (a.as_ptr(), b.as_ptr()); + if n >= 8 { + if n > 16 { + return a == b; + } + let x = p.cast::().read_unaligned() ^ q.cast::().read_unaligned(); + let y = p.add(n - 8).cast::().read_unaligned() + ^ q.add(n - 8).cast::().read_unaligned(); + return (x | y) == 0; + } + if n >= 4 { + let x = p.cast::().read_unaligned() ^ q.cast::().read_unaligned(); + let y = p.add(n - 4).cast::().read_unaligned() + ^ q.add(n - 4).cast::().read_unaligned(); + return (x | y) == 0; + } + if n >= 2 { + let x = p.cast::().read_unaligned() ^ q.cast::().read_unaligned(); + let y = p.add(n - 2).cast::().read_unaligned() + ^ q.add(n - 2).cast::().read_unaligned(); + return (x | y) == 0; + } + n == 0 || *p == *q + } +} + +/// An ordered hash table from [`DictKey`] to `V` (see the module docs): +/// [`DictMap`] for a dict, [`SetMap`] for a set. +pub struct Table { + entries: Vec>, + /// The slot table: empty for a small table, else a power of two long. + slots: Box<[u64]>, + /// `64 - log2(slots.len())`: the shift that takes a mixed hash to its + /// home slot. + shift: u32, +} + +#[inline(always)] +fn mix(hash: i64) -> u64 { + (hash as u64).wrapping_mul(MIX) +} + +/// The slot count for `n` entries: at most two thirds full. +fn slots_for(n: usize) -> usize { + (n.max(SMALL + 1) * 3 / 2 + 1).next_power_of_two() +} + +impl Default for Table { + #[inline] + fn default() -> Self { + Self::new() + } +} + +impl Clone for Table { + fn clone(&self) -> Self { + Self { + entries: self.entries.clone(), + slots: self.slots.clone(), + shift: self.shift, + } + } +} + +impl fmt::Debug for Table { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_map() + .entries(self.entries.iter().map(|b| (&b.key, &b.value))) + .finish() + } +} + +impl Table { + /// An empty table. + #[inline] + pub fn new() -> Self { + Self { + entries: Vec::new(), + slots: Box::new([]), + shift: 64, + } + } + + /// An empty table with room for `n` entries. + pub fn with_capacity(n: usize) -> Self { + let mut m = Self { + entries: Vec::with_capacity(n), + slots: Box::new([]), + shift: 64, + }; + if n > SMALL { + m.rebuild_slots(slots_for(n)); + } + m + } + + /// A table of the `n` entries `entry(i)` gives in order, whose keys are + /// distinct and each paired with its Python hash, built in one pass: + /// the entries are laid down, then indexed once (no probe compares a + /// key). + #[inline] + pub fn from_unique_hashed(n: usize, mut entry: impl FnMut(usize) -> (i64, DictKey, V)) -> Self { + let mut entries: Vec> = Vec::with_capacity(n); + let dst = entries.as_mut_ptr(); + for i in 0..n { + let (hash, key, value) = entry(i); + // SAFETY: `i < n`, inside the capacity; the length is set once + // every slot below `n` is written. + unsafe { dst.add(i).write(Bucket { hash, key, value }) }; + } + // SAFETY: the first `n` buckets were written above. + unsafe { entries.set_len(n) }; + let mut m = Self { + entries, + slots: Box::new([]), + shift: 64, + }; + if m.entries.len() > SMALL { + m.rebuild_slots(slots_for(m.entries.len())); + } + m + } + + /// [`Self::with_capacity`]; the hasher is implied (the table mixes + /// Python hashes itself). + #[inline] + pub fn with_capacity_and_hasher(n: usize, _: crate::fasthash::FxBuildHasher) -> Self { + Self::with_capacity(n) + } + + #[inline] + pub fn len(&self) -> usize { + self.entries.len() + } + + #[inline] + pub fn is_empty(&self) -> bool { + self.entries.is_empty() + } + + /// How many entries fit before the entry vector reallocates. + #[inline] + pub fn capacity(&self) -> usize { + self.entries.capacity() + } + + /// The entries in order. + #[inline] + pub fn as_entries(&self) -> &[Bucket] { + &self.entries + } + + /// Make room for `additional` more entries. + pub fn reserve(&mut self, additional: usize) { + self.entries.reserve(additional); + self.reserve_slots(additional); + } + + /// [`Self::reserve`], reporting an allocation failure instead of + /// aborting. + pub fn try_reserve( + &mut self, + additional: usize, + ) -> Result<(), std::collections::TryReserveError> { + self.entries.try_reserve(additional)?; + self.reserve_slots(additional); + Ok(()) + } + + fn reserve_slots(&mut self, additional: usize) { + let want = self.entries.len().saturating_add(additional); + if want > SMALL && (want * 3 > self.slots.len() * 2) { + self.rebuild_slots(slots_for(want)); + } + } + + /// Release spare capacity. + pub fn shrink_to_fit(&mut self) { + self.entries.shrink_to_fit(); + if self.entries.len() <= SMALL { + self.slots = Box::new([]); + self.shift = 64; + } else if slots_for(self.entries.len()) < self.slots.len() { + self.rebuild_slots(slots_for(self.entries.len())); + } + } + + /// Remove every entry, keeping the allocations. + #[inline] + pub fn clear(&mut self) { + self.entries.clear(); + // A small table has no slots, so skip the `memset` call. A recycled + // keyword dict otherwise made one per call, of zero bytes at the + // empty slice's dangling address, and on AMD Zen 4 and Zen 5 that + // cost about 100 ns (glibc's AVX-512 `memset` stores through a mask + // there, apparently taking a microcode assist for the unmapped + // page). + if !self.slots.is_empty() { + self.slots.fill(0); + } + } + + /// Rebuild the slot table at `n` slots (a power of two) from the + /// entries' stored hashes; no key is hashed or compared. + fn rebuild_slots(&mut self, n: usize) { + debug_assert!(n.is_power_of_two() && n >= 16); + assert!( + n <= 1 << 32 && self.entries.len() < IX_MASK as usize, + "dict too large" + ); + self.slots = vec![0u64; n].into_boxed_slice(); + self.shift = 64 - n.trailing_zeros(); + let mask = n - 1; + for (i, b) in self.entries.iter().enumerate() { + let m = mix(b.hash); + let mut pos = (m >> self.shift) as usize; + // SAFETY: `pos` is masked into the table throughout. + unsafe { + while *self.slots.get_unchecked(pos) != 0 { + pos = (pos + 1) & mask; + } + *self.slots.get_unchecked_mut(pos) = (m & !IX_MASK) | (i as u64 + 1); + } + } + } + + /// Re-derive the slots after the entries were reordered or dropped in + /// bulk. + fn reindex(&mut self) { + if self.slots.is_empty() { + return; + } + self.rebuild_slots(self.slots.len()); + } + + /// The position of the entry equal to `key` with hash `hash`, or, on a + /// miss, `Err` with the empty slot where it would go (unused for a + /// small table). + #[inline(always)] + fn find_hashed(&self, hash: i64, key: &Q) -> Result { + if self.slots.is_empty() { + for (i, b) in self.entries.iter().enumerate() { + if b.hash == hash && key.probe_eq(&b.key) { + return Ok(i); + } + } + return Err(0); + } + let m = mix(hash); + let mask = self.slots.len() - 1; + let mut pos = (m >> self.shift) as usize; + loop { + // SAFETY: `pos` is masked into the table, and a nonzero slot + // holds a live entry index plus one. + unsafe { + let s = *self.slots.get_unchecked(pos); + if s == 0 { + return Err(pos); + } + if (s ^ m) <= IX_MASK { + let ix = (s & IX_MASK) as usize - 1; + let b = self.entries.get_unchecked(ix); + if b.hash == hash && key.probe_eq(&b.key) { + return Ok(ix); + } + } + } + pos = (pos + 1) & mask; + } + } + + /// The slot that holds entry `ix` (whose hash is `hash`). + #[inline] + fn slot_of(&self, hash: i64, ix: usize) -> usize { + let m = mix(hash); + let mask = self.slots.len() - 1; + let mut pos = (m >> self.shift) as usize; + let want = ix as u64 + 1; + loop { + // SAFETY: masked into the table; entry `ix` is present, so + // the walk ends at its slot before any empty one. + let s = unsafe { *self.slots.get_unchecked(pos) }; + debug_assert!(s != 0, "entry {ix} has no slot"); + if s & IX_MASK == want { + return pos; + } + pos = (pos + 1) & mask; + } + } + + /// Free slot `pos`, shifting back the run after it (no tombstones). + fn erase_slot(&mut self, mut pos: usize) { + let mask = self.slots.len() - 1; + let bits = 64 - self.shift; + let mut next = (pos + 1) & mask; + loop { + let s = self.slots[next]; + if s == 0 { + break; + } + let home = (s >> (64 - bits)) as usize; + // The entry at `next` may fill the hole when its home is not + // strictly between the hole and itself. + if (next.wrapping_sub(home) & mask) >= (next.wrapping_sub(pos) & mask) { + self.slots[pos] = s; + pos = next; + } + next = (next + 1) & mask; + } + self.slots[pos] = 0; + } + + /// Point the slot of entry `from` (hash `hash`) at entry `to`. + #[inline] + fn repoint(&mut self, hash: i64, from: usize, to: usize) { + let pos = self.slot_of(hash, from); + self.slots[pos] = (self.slots[pos] & !IX_MASK) | (to as u64 + 1); + } + + // ---------------------------------------------------------------- + // Lookups. + + /// The position of the entry equal to `key`. + #[inline] + pub fn get_index_of(&self, key: &Q) -> Option { + if self.slots.is_empty() { + if self.entries.is_empty() { + return None; + } + if let Some(found) = self.scan_unhashed(key) { + return found; + } + } + self.find_hashed(key.probe_hash(), key).ok() + } + + /// A small table's lookup without hashing the probe (see + /// [`Probe::probe_eq_unhashed`]); `None` when some entry needs the + /// hash. + #[inline(always)] + fn scan_unhashed(&self, key: &Q) -> Option> { + let mut found = None; + for (i, b) in self.entries.iter().enumerate() { + if key.probe_eq_unhashed(&b.key)? { + found = Some(i); + break; + } + } + Some(found) + } + + /// [`Self::get`], always in line: for the interpreter's subscript + /// fast paths, where the call would cost a fair share of the probe. + #[inline(always)] + pub fn get_hot(&self, key: &Q) -> Option<&V> { + let i = self.get_index_hot(key)?; + // SAFETY: a found position is in bounds. + Some(unsafe { &self.entries.get_unchecked(i).value }) + } + + /// [`Self::get_index_of`], always in line (see [`Self::get_hot`]). + #[inline(always)] + pub fn get_index_hot(&self, key: &Q) -> Option { + if self.slots.is_empty() { + if self.entries.is_empty() { + return None; + } + if let Some(found) = self.scan_unhashed(key) { + return found; + } + } + self.find_hashed(key.probe_hash(), key).ok() + } + + #[inline] + pub fn get(&self, key: &Q) -> Option<&V> { + let i = self.get_index_of(key)?; + // SAFETY: a found position is in bounds. + Some(unsafe { &self.entries.get_unchecked(i).value }) + } + + #[inline] + pub fn get_mut(&mut self, key: &Q) -> Option<&mut V> { + let i = self.get_index_of(key)?; + // SAFETY: a found position is in bounds. + Some(unsafe { &mut self.entries.get_unchecked_mut(i).value }) + } + + #[inline] + pub fn get_full(&self, key: &Q) -> Option<(usize, &DictKey, &V)> { + let i = self.get_index_of(key)?; + let b = &self.entries[i]; + Some((i, &b.key, &b.value)) + } + + #[inline] + pub fn get_full_mut( + &mut self, + key: &Q, + ) -> Option<(usize, &DictKey, &mut V)> { + let i = self.get_index_of(key)?; + let b = &mut self.entries[i]; + Some((i, &b.key, &mut b.value)) + } + + #[inline] + pub fn get_key_value(&self, key: &Q) -> Option<(&DictKey, &V)> { + let i = self.get_index_of(key)?; + let b = &self.entries[i]; + Some((&b.key, &b.value)) + } + + #[inline] + pub fn contains_key(&self, key: &Q) -> bool { + self.get_index_of(key).is_some() + } + + /// The position of the first entry with Python hash `hash` that `eq` + /// accepts; `eq` sees only keys of that exact hash. + pub fn find_by_hash(&self, hash: i64, mut eq: impl FnMut(&DictKey) -> bool) -> Option { + struct Pred<'a, F>(std::cell::RefCell<&'a mut F>); + impl bool> Probe for Pred<'_, F> { + fn probe_hash(&self) -> i64 { + unreachable!("hashed by the caller") + } + fn probe_eq(&self, stored: &DictKey) -> bool { + (self.0.borrow_mut())(stored) + } + } + self.find_hashed(hash, &Pred(std::cell::RefCell::new(&mut eq))) + .ok() + } + + /// Every stored key with Python hash `hash`, in probe order. + pub fn keys_with_hash(&self, hash: i64) -> Vec<&DictKey> { + let mut out = Vec::new(); + let _ = self.find_by_hash(hash, |k| { + out.push(std::ptr::from_ref::(k)); + false + }); + // SAFETY: the pointers address entries of `self`, borrowed for the + // returned lifetime. + out.into_iter().map(|p| unsafe { &*p }).collect() + } + + /// The stored Python hash of the entry at `i`. + #[inline] + pub fn hash_at(&self, i: usize) -> Option { + self.entries.get(i).map(|b| b.hash) + } + + // ---------------------------------------------------------------- + // Positional access. + + #[inline] + pub fn get_index(&self, i: usize) -> Option<(&DictKey, &V)> { + self.entries.get(i).map(|b| (&b.key, &b.value)) + } + + #[inline] + pub fn get_index_mut(&mut self, i: usize) -> Option<(&DictKey, &mut V)> { + self.entries.get_mut(i).map(|b| (&b.key, &mut b.value)) + } + + /// Mutable access to a key in place. The caller must keep its hash + /// and equality unchanged. + #[inline] + pub fn get_index_mut2(&mut self, i: usize) -> Option<(&mut DictKey, &mut V)> { + self.entries.get_mut(i).map(|b| (&mut b.key, &mut b.value)) + } + + #[inline] + pub fn first(&self) -> Option<(&DictKey, &V)> { + self.get_index(0) + } + + #[inline] + pub fn last(&self) -> Option<(&DictKey, &V)> { + self.entries.last().map(|b| (&b.key, &b.value)) + } + + // ---------------------------------------------------------------- + // Insertion. + + /// Append `key` (hash `hash`), known to be absent, at slot `pos` (from + /// a missed [`Self::find_hashed`]): its position. + #[inline] + fn push_at(&mut self, pos: usize, hash: i64, key: DictKey, value: V) -> usize { + let i = self.entries.len(); + if self.slots.is_empty() { + if i < SMALL { + self.entries.push(Bucket { hash, key, value }); + return i; + } + self.entries.push(Bucket { hash, key, value }); + self.rebuild_slots(slots_for(i + 1)); + return i; + } + if (i + 1) * 3 > self.slots.len() * 2 { + self.entries.push(Bucket { hash, key, value }); + self.rebuild_slots(self.slots.len() * 2); + return i; + } + assert!(i < IX_MASK as usize - 1, "dict too large"); + // SAFETY: `pos` is an empty slot inside the table. + unsafe { + *self.slots.get_unchecked_mut(pos) = (mix(hash) & !IX_MASK) | (i as u64 + 1); + } + self.entries.push(Bucket { hash, key, value }); + i + } + + /// Insert or replace: the entry's position and the replaced value. + #[inline] + pub fn insert_full(&mut self, key: DictKey, value: V) -> (usize, Option) { + let hash = key.probe_hash(); + self.insert_hashed(hash, key, value) + } + + /// [`Self::insert_full`] with the key's Python hash precomputed. + #[inline] + pub fn insert_hashed(&mut self, hash: i64, key: DictKey, value: V) -> (usize, Option) { + match self.find_hashed(hash, &key) { + Ok(i) => { + // SAFETY: a found position is in bounds. + let slot = unsafe { &mut self.entries.get_unchecked_mut(i).value }; + (i, Some(std::mem::replace(slot, value))) + } + Err(pos) => (self.push_at(pos, hash, key, value), None), + } + } + + #[inline] + pub fn insert(&mut self, key: DictKey, value: V) -> Option { + self.insert_full(key, value).1 + } + + /// Append `key` with Python hash `hash` without looking for an equal + /// key: the caller knows there is none. Its position. + pub fn insert_unique_hashed(&mut self, hash: i64, key: DictKey, value: V) -> usize { + if self.slots.is_empty() { + return self.push_at(0, hash, key, value); + } + let m = mix(hash); + let mask = self.slots.len() - 1; + let mut pos = (m >> self.shift) as usize; + while self.slots[pos] != 0 { + pos = (pos + 1) & mask; + } + self.push_at(pos, hash, key, value) + } + + /// The entry for `key`, to read, change, or fill. + pub fn entry(&mut self, key: DictKey) -> Entry<'_, V> { + let hash = key.probe_hash(); + match self.find_hashed(hash, &key) { + Ok(index) => Entry::Occupied(OccupiedEntry { map: self, index }), + Err(pos) => Entry::Vacant(VacantEntry { + map: self, + key, + hash, + pos, + }), + } + } + + /// The entry for a probe: its position if present, else a vacancy + /// that inserts the key the caller builds. + #[inline(always)] + pub fn probe_entry(&mut self, key: &Q) -> ProbeEntry<'_, V> { + let hash = key.probe_hash(); + match self.find_hashed(hash, key) { + Ok(index) => ProbeEntry::Occupied(OccupiedEntry { map: self, index }), + Err(pos) => ProbeEntry::Vacant(ProbeVacancy { + map: self, + hash, + pos, + }), + } + } + + // ---------------------------------------------------------------- + // Removal. + + /// Remove entry `i`, shifting the later entries down. + pub fn shift_remove_index(&mut self, i: usize) -> Option<(DictKey, V)> { + let n = self.entries.len(); + if i >= n { + return None; + } + if self.slots.is_empty() { + let b = self.entries.remove(i); + return Some((b.key, b.value)); + } + let pos = self.slot_of(self.entries[i].hash, i); + self.erase_slot(pos); + let b = self.entries.remove(i); + // Renumber the entries that moved down: one slot walk each when + // few moved, else one pass over the table. + let moved = n - 1 - i; + if moved * 4 <= self.slots.len() { + for j in i..n - 1 { + let h = self.entries[j].hash; + self.repoint(h, j + 1, j); + } + } else { + let above = i as u64 + 1; + for s in self.slots.iter_mut() { + if *s & IX_MASK > above { + *s -= 1; + } + } + } + Some((b.key, b.value)) + } + + /// Remove entry `i`, moving the last entry into its place. + pub fn swap_remove_index(&mut self, i: usize) -> Option<(DictKey, V)> { + let n = self.entries.len(); + if i >= n { + return None; + } + if !self.slots.is_empty() { + let pos = self.slot_of(self.entries[i].hash, i); + self.erase_slot(pos); + if i != n - 1 { + let h = self.entries[n - 1].hash; + self.repoint(h, n - 1, i); + } + } + let b = self.entries.swap_remove(i); + Some((b.key, b.value)) + } + + /// Put `key` (hash `hash`), known to be absent, in entry `i`'s place, + /// leaving every other entry where it is: the replaced key and value. + pub fn replace_index_unique( + &mut self, + i: usize, + hash: i64, + key: DictKey, + value: V, + ) -> Option<(DictKey, V)> { + let old = self.entries.get(i)?.hash; + if !self.slots.is_empty() { + let pos = self.slot_of(old, i); + self.erase_slot(pos); + let m = mix(hash); + let mask = self.slots.len() - 1; + let mut pos = (m >> self.shift) as usize; + while self.slots[pos] != 0 { + pos = (pos + 1) & mask; + } + self.slots[pos] = (m & !IX_MASK) | (i as u64 + 1); + } + let b = std::mem::replace(&mut self.entries[i], Bucket { hash, key, value }); + Some((b.key, b.value)) + } + + /// Remove the last entry. + pub fn pop(&mut self) -> Option<(DictKey, V)> { + let n = self.entries.len(); + if n == 0 { + return None; + } + if !self.slots.is_empty() { + let pos = self.slot_of(self.entries[n - 1].hash, n - 1); + self.erase_slot(pos); + } + let b = self.entries.pop()?; + Some((b.key, b.value)) + } + + pub fn shift_remove_full(&mut self, key: &Q) -> Option<(usize, DictKey, V)> { + let i = self.get_index_of(key)?; + let (k, v) = self.shift_remove_index(i)?; + Some((i, k, v)) + } + + pub fn shift_remove_entry(&mut self, key: &Q) -> Option<(DictKey, V)> { + let i = self.get_index_of(key)?; + self.shift_remove_index(i) + } + + pub fn shift_remove(&mut self, key: &Q) -> Option { + self.shift_remove_entry(key).map(|(_, v)| v) + } + + pub fn swap_remove(&mut self, key: &Q) -> Option { + let i = self.get_index_of(key)?; + self.swap_remove_index(i).map(|(_, v)| v) + } + + pub fn swap_remove_full(&mut self, key: &Q) -> Option<(usize, DictKey, V)> { + let i = self.get_index_of(key)?; + let (k, v) = self.swap_remove_index(i)?; + Some((i, k, v)) + } + + /// Keep the entries `keep` accepts, in order. + pub fn retain(&mut self, mut keep: impl FnMut(&DictKey, &mut V) -> bool) { + let n = self.entries.len(); + self.entries.retain_mut(|b| keep(&b.key, &mut b.value)); + if self.entries.len() != n { + self.reindex(); + } + } + + /// Keep the first `len` entries. + pub fn truncate(&mut self, len: usize) { + if len < self.entries.len() { + self.entries.truncate(len); + self.reindex(); + } + } + + /// Split off the entries from `at` on. + pub fn split_off(&mut self, at: usize) -> Self { + let tail = self.entries.split_off(at); + self.reindex(); + let mut out = Self { + entries: tail, + slots: Box::new([]), + shift: 64, + }; + if out.entries.len() > SMALL { + out.rebuild_slots(slots_for(out.entries.len())); + } + out + } + + /// Remove the entries in `range`, yielding them. + pub fn drain>( + &mut self, + range: R, + ) -> std::vec::IntoIter<(DictKey, V)> { + let out: Vec<(DictKey, V)> = self + .entries + .drain(range) + .map(|b| (b.key, b.value)) + .collect(); + self.reindex(); + out.into_iter() + } + + /// Move entry `from` to position `to`, shifting the ones between. + pub fn move_index(&mut self, from: usize, to: usize) { + let n = self.entries.len(); + assert!(from < n && to < n, "move_index out of bounds"); + if from == to { + return; + } + if self.slots.is_empty() { + if from < to { + self.entries[from..=to].rotate_left(1); + } else { + self.entries[to..=from].rotate_right(1); + } + return; + } + let (lo, hi) = (from.min(to), from.max(to)); + // Locate every affected slot before renumbering any. + let at: Vec = (lo..=hi) + .map(|k| self.slot_of(self.entries[k].hash, k)) + .collect(); + for (k, &pos) in (lo..=hi).zip(&at) { + let new = if k == from { + to + } else if from < to { + k - 1 + } else { + k + 1 + }; + self.slots[pos] = (self.slots[pos] & !IX_MASK) | (new as u64 + 1); + } + if from < to { + self.entries[from..=to].rotate_left(1); + } else { + self.entries[to..=from].rotate_right(1); + } + } + + /// Swap the entries at `a` and `b`. + pub fn swap_indices(&mut self, a: usize, b: usize) { + if a == b { + return; + } + if !self.slots.is_empty() { + let pa = self.slot_of(self.entries[a].hash, a); + let pb = self.slot_of(self.entries[b].hash, b); + self.slots[pa] = (self.slots[pa] & !IX_MASK) | (b as u64 + 1); + self.slots[pb] = (self.slots[pb] & !IX_MASK) | (a as u64 + 1); + } + self.entries.swap(a, b); + } + + /// Reverse the order. + pub fn reverse(&mut self) { + self.entries.reverse(); + self.reindex(); + } + + /// Sort the entries with `cmp` (stable). + pub fn sort_by( + &mut self, + mut cmp: impl FnMut(&DictKey, &V, &DictKey, &V) -> std::cmp::Ordering, + ) { + self.entries + .sort_by(|a, b| cmp(&a.key, &a.value, &b.key, &b.value)); + self.reindex(); + } + + /// Sort the entries by key with `cmp` (stable). + pub fn sort_by_key_with( + &mut self, + mut cmp: impl FnMut(&DictKey, &DictKey) -> std::cmp::Ordering, + ) { + self.entries.sort_by(|a, b| cmp(&a.key, &b.key)); + self.reindex(); + } + + // ---------------------------------------------------------------- + // Iteration. + + #[inline] + pub fn iter(&self) -> Iter<'_, V> { + Iter(self.entries.iter()) + } + + #[inline] + pub fn iter_mut(&mut self) -> IterMut<'_, V> { + IterMut(self.entries.iter_mut()) + } + + /// Mutable keys and values. The caller must keep every key's hash and + /// equality unchanged. + #[inline] + pub fn iter_mut2(&mut self) -> IterMut2<'_, V> { + IterMut2(self.entries.iter_mut()) + } + + #[inline] + pub fn keys(&self) -> Keys<'_, V> { + Keys(self.entries.iter()) + } + + #[inline] + pub fn values(&self) -> Values<'_, V> { + Values(self.entries.iter()) + } + + #[inline] + pub fn values_mut(&mut self) -> ValuesMut<'_, V> { + ValuesMut(self.entries.iter_mut()) + } + + pub fn into_keys(self) -> impl DoubleEndedIterator + ExactSizeIterator { + self.entries.into_iter().map(|b| b.key) + } + + pub fn into_values(self) -> impl DoubleEndedIterator + ExactSizeIterator { + self.entries.into_iter().map(|b| b.value) + } +} + +/// An entry of [`DictMap::entry`]. +#[derive(Debug)] +pub enum Entry<'a, V = Object> { + Occupied(OccupiedEntry<'a, V>), + Vacant(VacantEntry<'a, V>), +} + +/// A present entry. +#[derive(Debug)] +pub struct OccupiedEntry<'a, V = Object> { + map: &'a mut Table, + index: usize, +} + +/// An absent key, with the slot it would take. +#[derive(Debug)] +pub struct VacantEntry<'a, V = Object> { + map: &'a mut Table, + key: DictKey, + hash: i64, + pos: usize, +} + +/// An entry of [`DictMap::probe_entry`]. +#[derive(Debug)] +pub enum ProbeEntry<'a, V = Object> { + Occupied(OccupiedEntry<'a, V>), + Vacant(ProbeVacancy<'a, V>), +} + +/// An absent probe key, with its hash and the slot it would take. +#[derive(Debug)] +pub struct ProbeVacancy<'a, V = Object> { + map: &'a mut Table, + hash: i64, + pos: usize, +} + +impl<'a, V> Entry<'a, V> { + pub fn or_insert(self, default: V) -> &'a mut V { + match self { + Entry::Occupied(e) => e.into_mut(), + Entry::Vacant(e) => e.insert(default), + } + } + + pub fn or_insert_with(self, f: impl FnOnce() -> V) -> &'a mut V { + match self { + Entry::Occupied(e) => e.into_mut(), + Entry::Vacant(e) => e.insert(f()), + } + } + + pub fn index(&self) -> usize { + match self { + Entry::Occupied(e) => e.index, + Entry::Vacant(e) => e.map.len(), + } + } +} + +impl<'a, V> OccupiedEntry<'a, V> { + #[inline] + pub fn index(&self) -> usize { + self.index + } + + #[inline] + pub fn key(&self) -> &DictKey { + &self.map.entries[self.index].key + } + + #[inline] + pub fn get(&self) -> &V { + &self.map.entries[self.index].value + } + + #[inline] + pub fn get_mut(&mut self) -> &mut V { + &mut self.map.entries[self.index].value + } + + #[inline] + pub fn into_mut(self) -> &'a mut V { + &mut self.map.entries[self.index].value + } + + #[inline] + pub fn insert(&mut self, value: V) -> V { + std::mem::replace(self.get_mut(), value) + } + + pub fn shift_remove_entry(self) -> (DictKey, V) { + self.map + .shift_remove_index(self.index) + .expect("occupied entry is present") + } + + pub fn shift_remove(self) -> V { + self.shift_remove_entry().1 + } +} + +impl<'a, V> VacantEntry<'a, V> { + #[inline] + pub fn key(&self) -> &DictKey { + &self.key + } + + pub fn insert(self, value: V) -> &'a mut V { + let i = self.map.push_at(self.pos, self.hash, self.key, value); + &mut self.map.entries[i].value + } +} + +impl ProbeVacancy<'_, V> { + /// The probe's Python hash. + #[inline] + pub fn hash(&self) -> i64 { + self.hash + } + + /// Insert `key`, which must equal the probe (same hash, same key): + /// its position. + #[inline] + pub fn insert(self, key: DictKey, value: V) -> usize { + self.map.push_at(self.pos, self.hash, key, value) + } +} + +macro_rules! entry_iter { + ($name:ident, $inner:ty, $item:ty, |$b:ident| $map:expr) => { + pub struct $name<'a, V = Object>($inner); + + impl<'a, V> Iterator for $name<'a, V> { + type Item = $item; + + #[inline] + fn next(&mut self) -> Option { + self.0.next().map(|$b| $map) + } + + #[inline] + fn size_hint(&self) -> (usize, Option) { + self.0.size_hint() + } + + #[inline] + fn nth(&mut self, n: usize) -> Option { + self.0.nth(n).map(|$b| $map) + } + + #[inline] + fn count(self) -> usize { + self.0.len() + } + + #[inline] + fn last(mut self) -> Option { + self.next_back() + } + } + + impl DoubleEndedIterator for $name<'_, V> { + #[inline] + fn next_back(&mut self) -> Option { + self.0.next_back().map(|$b| $map) + } + + #[inline] + fn nth_back(&mut self, n: usize) -> Option { + self.0.nth_back(n).map(|$b| $map) + } + } + + impl ExactSizeIterator for $name<'_, V> { + #[inline] + fn len(&self) -> usize { + self.0.len() + } + } + + impl std::iter::FusedIterator for $name<'_, V> {} + + impl fmt::Debug for $name<'_, V> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_struct(stringify!($name)).finish_non_exhaustive() + } + } + }; +} + +entry_iter!( + Iter, + std::slice::Iter<'a, Bucket>, + (&'a DictKey, &'a V), + |b| (&b.key, &b.value) +); +entry_iter!( + IterMut, + std::slice::IterMut<'a, Bucket>, + (&'a DictKey, &'a mut V), + |b| (&b.key, &mut b.value) +); +entry_iter!( + IterMut2, + std::slice::IterMut<'a, Bucket>, + (&'a mut DictKey, &'a mut V), + |b| (&mut b.key, &mut b.value) +); +entry_iter!(Keys, std::slice::Iter<'a, Bucket>, &'a DictKey, |b| &b + .key); +entry_iter!(Values, std::slice::Iter<'a, Bucket>, &'a V, |b| &b.value); +entry_iter!( + ValuesMut, + std::slice::IterMut<'a, Bucket>, + &'a mut V, + |b| &mut b.value +); + +impl Clone for Iter<'_, V> { + fn clone(&self) -> Self { + Self(self.0.clone()) + } +} + +impl Clone for Keys<'_, V> { + fn clone(&self) -> Self { + Self(self.0.clone()) + } +} + +impl Clone for Values<'_, V> { + fn clone(&self) -> Self { + Self(self.0.clone()) + } +} + +/// The owning iterator of a [`DictMap`]. +pub struct IntoIter(std::vec::IntoIter>); + +impl Iterator for IntoIter { + type Item = (DictKey, V); + + #[inline] + fn next(&mut self) -> Option { + self.0.next().map(|b| (b.key, b.value)) + } + + #[inline] + fn size_hint(&self) -> (usize, Option) { + self.0.size_hint() + } +} + +impl DoubleEndedIterator for IntoIter { + #[inline] + fn next_back(&mut self) -> Option { + self.0.next_back().map(|b| (b.key, b.value)) + } +} + +impl ExactSizeIterator for IntoIter {} + +impl fmt::Debug for IntoIter { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_struct("IntoIter").finish_non_exhaustive() + } +} + +impl IntoIterator for Table { + type Item = (DictKey, V); + type IntoIter = IntoIter; + + fn into_iter(self) -> IntoIter { + IntoIter(self.entries.into_iter()) + } +} + +impl<'a, V> IntoIterator for &'a Table { + type Item = (&'a DictKey, &'a V); + type IntoIter = Iter<'a, V>; + + fn into_iter(self) -> Iter<'a, V> { + self.iter() + } +} + +impl<'a, V> IntoIterator for &'a mut Table { + type Item = (&'a DictKey, &'a mut V); + type IntoIter = IterMut<'a, V>; + + fn into_iter(self) -> IterMut<'a, V> { + self.iter_mut() + } +} + +impl Extend<(DictKey, V)> for Table { + fn extend>(&mut self, iter: I) { + let iter = iter.into_iter(); + let (lo, _) = iter.size_hint(); + // (As IndexMap: reserve for all when empty, else half, since some + // keys may already be present.) + self.reserve(if self.is_empty() { lo } else { lo.div_ceil(2) }); + for (k, v) in iter { + self.insert(k, v); + } + } +} + +impl<'a, V: Clone + 'a> Extend<(&'a DictKey, &'a V)> for Table { + fn extend>(&mut self, iter: I) { + self.extend(iter.into_iter().map(|(k, v)| (k.clone(), v.clone()))); + } +} + +impl FromIterator<(DictKey, V)> for Table { + fn from_iter>(iter: I) -> Self { + let mut m = Self::new(); + m.extend(iter); + m + } +} + +impl From<[(DictKey, V); N]> for Table { + fn from(arr: [(DictKey, V); N]) -> Self { + Self::from_iter(arr) + } +} + +impl std::ops::Index<&Q> for Table { + type Output = V; + + fn index(&self, key: &Q) -> &V { + self.get(key).expect("key not found") + } +} + +impl std::ops::Index for Table { + type Output = V; + + fn index(&self, i: usize) -> &V { + &self.entries[i].value + } +} + +/// The table behind a `dict`. +pub type DictMap = Table; + +/// The table behind a `set` or `frozenset`: [`Table`]'s entries without +/// values (a key and its hash), with the set operations' names. Iteration +/// is in insertion order; a removal moves the last entry into the freed +/// position (`set` order is arbitrary, and a set's iterator reports any +/// change of size). +#[derive(Clone, Default)] +pub struct SetMap(Table<()>); + +impl fmt::Debug for SetMap { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_set().entries(self.iter()).finish() + } +} + +/// The keys of a [`SetMap`], in order. +pub type SetIter<'a> = Keys<'a, ()>; + +impl SetMap { + #[inline] + pub fn new() -> Self { + Self(Table::new()) + } + + #[inline] + pub fn with_capacity(n: usize) -> Self { + Self(Table::with_capacity(n)) + } + + /// [`Self::with_capacity`]; the hasher is implied (see [`Table`]). + #[inline] + pub fn with_capacity_and_hasher(n: usize, _: crate::fasthash::FxBuildHasher) -> Self { + Self::with_capacity(n) + } + + /// [`Self::new`]; the hasher is implied. + #[inline] + pub fn with_hasher(_: crate::fasthash::FxBuildHasher) -> Self { + Self::new() + } + + #[inline] + pub fn len(&self) -> usize { + self.0.len() + } + + #[inline] + pub fn is_empty(&self) -> bool { + self.0.is_empty() + } + + #[inline] + pub fn capacity(&self) -> usize { + self.0.capacity() + } + + #[inline] + pub fn reserve(&mut self, additional: usize) { + self.0.reserve(additional); + } + + pub fn shrink_to_fit(&mut self) { + self.0.shrink_to_fit(); + } + + #[inline] + pub fn clear(&mut self) { + self.0.clear(); + } + + /// The entries in order (each key with its stored hash). + #[inline] + pub fn as_entries(&self) -> &[Bucket<()>] { + self.0.as_entries() + } + + /// Add `key`: `false` when an equal key was already present (which + /// stays). + #[inline] + pub fn insert(&mut self, key: DictKey) -> bool { + self.insert_full(key).1 + } + + /// [`Self::insert`], with the key's position. + #[inline] + pub fn insert_full(&mut self, key: DictKey) -> (usize, bool) { + let hash = key.probe_hash(); + self.insert_hashed(hash, key) + } + + /// [`Self::insert_full`] with the key's Python hash precomputed. + #[inline] + pub fn insert_hashed(&mut self, hash: i64, key: DictKey) -> (usize, bool) { + match self.0.find_hashed(hash, &key) { + Ok(i) => (i, false), + Err(pos) => (self.0.push_at(pos, hash, key, ()), true), + } + } + + /// Append `key` with Python hash `hash`, known to be absent: its + /// position. + #[inline] + pub fn insert_unique_hashed(&mut self, hash: i64, key: DictKey) -> usize { + self.0.insert_unique_hashed(hash, key, ()) + } + + /// Add a probe's key if absent: the key is built (by `make`) only + /// then. `true` when it was added. + #[inline] + pub fn insert_probe( + &mut self, + key: &Q, + make: impl FnOnce() -> DictKey, + ) -> bool { + match self.0.probe_entry(key) { + ProbeEntry::Occupied(_) => false, + ProbeEntry::Vacant(v) => { + v.insert(make(), ()); + true + } + } + } + + /// The position of the key equal to `key`. The probe is hashed even + /// when the table is empty (CPython hashes first, so a raising + /// `__hash__` surfaces from `x in set()`). + #[inline] + fn find(&self, key: &Q) -> Option { + if self.0.is_empty() { + let _ = key.probe_hash(); + return None; + } + self.0.get_index_of(key) + } + + #[inline] + pub fn contains(&self, key: &Q) -> bool { + self.find(key).is_some() + } + + /// [`Self::contains`], always in line, for a probe whose hash runs no + /// code (the interpreter's membership fast paths). + #[inline(always)] + pub fn contains_hot(&self, key: &Q) -> bool { + self.0.get_index_hot(key).is_some() + } + + #[inline] + pub fn get_index_of(&self, key: &Q) -> Option { + self.find(key) + } + + /// The stored key equal to `key`. + #[inline] + pub fn get(&self, key: &Q) -> Option<&DictKey> { + let i = self.find(key)?; + Some(&self.0.as_entries()[i].key) + } + + #[inline] + pub fn get_full(&self, key: &Q) -> Option<(usize, &DictKey)> { + let i = self.find(key)?; + Some((i, &self.0.as_entries()[i].key)) + } + + /// The position of the first key with Python hash `hash` that `eq` + /// accepts (see [`Table::find_by_hash`]). + #[inline] + pub fn find_by_hash(&self, hash: i64, eq: impl FnMut(&DictKey) -> bool) -> Option { + self.0.find_by_hash(hash, eq) + } + + /// The stored Python hash of the key at `i`. + #[inline] + pub fn hash_at(&self, i: usize) -> Option { + self.0.hash_at(i) + } + + #[inline] + pub fn get_index(&self, i: usize) -> Option<&DictKey> { + self.0.as_entries().get(i).map(|b| &b.key) + } + + #[inline] + pub fn first(&self) -> Option<&DictKey> { + self.get_index(0) + } + + #[inline] + pub fn last(&self) -> Option<&DictKey> { + self.0.as_entries().last().map(|b| &b.key) + } + + /// Remove the key equal to `key` (the last key takes its place): + /// whether it was present. + #[inline] + pub fn swap_remove(&mut self, key: &Q) -> bool { + self.swap_take(key).is_some() + } + + /// [`Self::swap_remove`], returning the removed key. + #[inline] + pub fn swap_take(&mut self, key: &Q) -> Option { + let i = self.find(key)?; + self.0.swap_remove_index(i).map(|(k, ())| k) + } + + /// [`Self::swap_take`], with the key's former position. + #[inline] + pub fn swap_remove_full(&mut self, key: &Q) -> Option<(usize, DictKey)> { + let i = self.find(key)?; + self.0.swap_remove_index(i).map(|(k, ())| (i, k)) + } + + /// Remove the key equal to `key`, shifting the later keys down. + #[inline] + pub fn shift_remove(&mut self, key: &Q) -> bool { + self.shift_take(key).is_some() + } + + /// [`Self::shift_remove`], returning the removed key. + #[inline] + pub fn shift_take(&mut self, key: &Q) -> Option { + let i = self.find(key)?; + self.0.shift_remove_index(i).map(|(k, ())| k) + } + + #[inline] + pub fn swap_remove_index(&mut self, i: usize) -> Option { + self.0.swap_remove_index(i).map(|(k, ())| k) + } + + #[inline] + pub fn shift_remove_index(&mut self, i: usize) -> Option { + self.0.shift_remove_index(i).map(|(k, ())| k) + } + + /// Remove the last key. + #[inline] + pub fn pop(&mut self) -> Option { + self.0.pop().map(|(k, ())| k) + } + + /// Keep the keys `keep` accepts, in order. + pub fn retain(&mut self, mut keep: impl FnMut(&DictKey) -> bool) { + self.0.retain(|k, ()| keep(k)); + } + + /// Remove the keys in `range`, yielding them. + pub fn drain>( + &mut self, + range: R, + ) -> impl Iterator { + self.0.drain(range).map(|(k, ())| k) + } + + /// Sort the keys with `cmp` (stable). + pub fn sort_by(&mut self, mut cmp: impl FnMut(&DictKey, &DictKey) -> std::cmp::Ordering) { + self.0.sort_by_key_with(|a, b| cmp(a, b)); + } + + #[inline] + pub fn iter(&self) -> SetIter<'_> { + self.0.keys() + } + + /// The keys in `self` that `other` lacks, in order. + pub fn difference<'a>(&'a self, other: &'a SetMap) -> impl Iterator + 'a { + self.iter().filter(move |k| !other.contains(*k)) + } + + /// The keys in both, in `self`'s order. + pub fn intersection<'a>(&'a self, other: &'a SetMap) -> impl Iterator + 'a { + self.iter().filter(move |k| other.contains(*k)) + } + + /// `self`'s keys, then `other`'s that `self` lacks. + pub fn union<'a>(&'a self, other: &'a SetMap) -> impl Iterator + 'a { + self.iter().chain(other.difference(self)) + } + + /// The keys in exactly one, `self`'s first. + pub fn symmetric_difference<'a>( + &'a self, + other: &'a SetMap, + ) -> impl Iterator + 'a { + self.difference(other).chain(other.difference(self)) + } + + pub fn is_subset(&self, other: &SetMap) -> bool { + self.len() <= other.len() && self.iter().all(|k| other.contains(k)) + } + + pub fn is_superset(&self, other: &SetMap) -> bool { + other.is_subset(self) + } + + pub fn is_disjoint(&self, other: &SetMap) -> bool { + let (small, big) = if self.len() <= other.len() { + (self, other) + } else { + (other, self) + }; + small.iter().all(|k| !big.contains(k)) + } +} + +impl IntoIterator for SetMap { + type Item = DictKey; + type IntoIter = std::iter::Map, fn((DictKey, ())) -> DictKey>; + + fn into_iter(self) -> Self::IntoIter { + fn key((k, ()): (DictKey, ())) -> DictKey { + k + } + self.0.into_iter().map(key as fn((DictKey, ())) -> DictKey) + } +} + +impl<'a> IntoIterator for &'a SetMap { + type Item = &'a DictKey; + type IntoIter = SetIter<'a>; + + fn into_iter(self) -> SetIter<'a> { + self.iter() + } +} + +impl Extend for SetMap { + fn extend>(&mut self, iter: I) { + let iter = iter.into_iter(); + let (lo, _) = iter.size_hint(); + self.reserve(if self.is_empty() { lo } else { lo.div_ceil(2) }); + for k in iter { + self.insert(k); + } + } +} + +impl<'a> Extend<&'a DictKey> for SetMap { + fn extend>(&mut self, iter: I) { + self.extend(iter.into_iter().cloned()); + } +} + +impl FromIterator for SetMap { + fn from_iter>(iter: I) -> Self { + let mut s = Self::new(); + s.extend(iter); + s + } +} + +impl From<[DictKey; N]> for SetMap { + fn from(arr: [DictKey; N]) -> Self { + Self::from_iter(arr) + } +} + +/// Equal sizes, and every key of one in the other (order aside). +impl PartialEq for SetMap { + fn eq(&self, other: &Self) -> bool { + self.len() == other.len() && self.iter().all(|k| other.contains(k)) + } +} + +impl std::ops::Index for SetMap { + type Output = DictKey; + + fn index(&self, i: usize) -> &DictKey { + &self.0.as_entries()[i].key + } +} + +#[cfg(test)] +mod tests { + use super::*; + + fn k(i: i64) -> DictKey { + DictKey(Object::Int(i)) + } + + fn check(m: &DictMap) { + for (i, b) in m.entries.iter().enumerate() { + assert_eq!(m.get_index_of(&b.key), Some(i)); + } + if !m.slots.is_empty() { + let used = m.slots.iter().filter(|s| **s != 0).count(); + assert_eq!(used, m.len()); + } + } + + #[test] + fn insert_remove_order() { + let mut m = DictMap::new(); + for i in 0..200 { + assert!(m.insert(k(i * 1024), Object::Int(i)).is_none()); + check(&m); + } + for i in (0..200).step_by(3) { + assert!(m.shift_remove(&k(i * 1024)).is_some()); + check(&m); + } + let keys: Vec = m + .keys() + .map(|k| match k.0 { + Object::Int(i) => i / 1024, + _ => unreachable!(), + }) + .collect(); + let want: Vec = (0..200).filter(|i| i % 3 != 0).collect(); + assert_eq!(keys, want); + m.move_index(0, 50); + check(&m); + m.move_index(60, 3); + check(&m); + m.swap_remove_index(7); + check(&m); + while m.pop().is_some() { + check(&m); + } + assert!(m.is_empty()); + } + + #[test] + fn small_and_clone() { + let mut m = DictMap::new(); + for i in 0..8 { + m.insert(k(i), Object::Int(i)); + } + assert!(m.slots.is_empty()); + m.insert(k(8), Object::Int(8)); + assert!(!m.slots.is_empty()); + let c = m.clone(); + check(&c); + assert_eq!( + c.get(&k(5)).map(|o| matches!(o, Object::Int(5))), + Some(true) + ); + assert!(c.get(&k(50)).is_none()); + } + + #[test] + fn replace_in_place() { + for n in [5_i64, 40] { + let mut m = DictMap::new(); + for i in 0..n { + m.insert(k(i * 1024), Object::Int(i)); + } + for (step, i) in (0..n).rev().enumerate() { + let new = 100_000 + step as i64; + let key = k(new); + let hash = key.probe_hash(); + let at = (i as usize * 7) % m.len(); + let (old, _) = m + .replace_index_unique(at, hash, key, Object::Int(new)) + .expect("in range"); + assert!(m.get(&old).is_none()); + assert_eq!(m.get_index_of(&k(new)), Some(at)); + assert_eq!(m.len(), n as usize); + check(&m); + } + assert!(m + .replace_index_unique(n as usize, 0, k(-1), Object::None) + .is_none()); + } + } +} diff --git a/crates/weavepy-vm/src/error.rs b/crates/weavepy-vm/src/error.rs index fa1aabb9..ebb4ed63 100644 --- a/crates/weavepy-vm/src/error.rs +++ b/crates/weavepy-vm/src/error.rs @@ -37,44 +37,16 @@ impl PartialEq for TracebackEntry { } } -/// An exception's [`TracebackEntry`] list, innermost first, with the -/// first entry held inline: most exceptions are caught in the frame that -/// raised them or the next one, and a raise then allocates nothing here. -#[derive(Debug, Clone, Default, PartialEq)] -pub struct TracebackEntries { - first: Option, - rest: Vec, -} - -impl TracebackEntries { - pub fn push(&mut self, entry: TracebackEntry) { - if self.first.is_none() { - self.first = Some(entry); - } else { - self.rest.push(entry); - } - } - - pub fn is_empty(&self) -> bool { - self.first.is_none() - } - - pub fn len(&self) -> usize { - usize::from(self.first.is_some()) + self.rest.len() - } - - /// The entries in push order (innermost frame first). - pub fn iter(&self) -> impl DoubleEndedIterator { - self.first.iter().chain(self.rest.iter()) - } -} - /// A Python-visible exception. The wrapped [`Object`] is always an /// `Object::Instance` whose class's MRO contains `BaseException`. #[derive(Debug, Clone)] pub struct PyException { pub instance: Object, - pub traceback: TracebackEntries, + /// Whether the exception has unwound through a frame (which added + /// that frame's entry to the instance's `__traceback__` chain): a + /// fresh Rust-raised error has not. The entries themselves live only + /// in the chain (see [`Self::traceback_entries`]). + pub traced: bool, /// Implicit chaining context (`raise X` inside `except Y:` records /// `Y` as `__context__`). Stored separately from `instance.__dict__` /// so re-raises through pure Rust paths keep the link intact. @@ -97,7 +69,7 @@ impl PyException { pub fn new(instance: Object) -> Self { Self { instance, - traceback: TracebackEntries::default(), + traced: false, context: None, cause: None, suppress_tb_once: false, @@ -127,8 +99,25 @@ impl PyException { crate::builtin_types::exception_message(&self.instance).unwrap_or_default() } - pub fn push_traceback(&mut self, entry: TracebackEntry) { - self.traceback.push(entry); + /// The instance's `__traceback__` chain as entries, outermost frame + /// first ("most recent call last"). + pub fn traceback_entries(&self) -> Vec { + let mut entries = Vec::new(); + let Object::Instance(inst) = &self.instance else { + return entries; + }; + let mut cur = match inst.slot_get("__traceback__") { + Some(Object::Traceback(tb)) => Some(tb), + _ => None, + }; + while let Some(node) = cur { + entries.push(TracebackEntry { + code: node.code(), + lineno: node.lineno, + }); + cur = node.next.borrow().clone(); + } + entries } /// PEP 678: append a string note to the wrapped instance's @@ -286,25 +275,55 @@ pub fn name_error(message: impl Into) -> RuntimeError { } pub fn attribute_error(message: impl Into) -> RuntimeError { - RuntimeError::PyException(PyException::from_builtin("AttributeError", message)) + // `name` and `obj` are laid out unset, so the attribute load the + // error propagates through stores them in place (see + // `attr_error_context_laid_out`). + let message: String = message.into(); + let arg = (!message.is_empty()).then(|| Object::from_str(message)); + let instance = crate::builtin_types::exception_from_parts_with( + crate::builtin_types::builtin_types() + .attribute_error + .clone(), + arg, + [("name", Object::Unbound), ("obj", Object::Unbound)], + ); + RuntimeError::PyException(PyException::new(instance)) } /// `AttributeError` carrying the structured `.name`/`.obj` fields /// CPython's C raise sites populate (PEP 3134-adjacent; used by /// suggestion machinery and asserted on by `test_exceptions`). pub fn attribute_error_named(obj: &Object, name: &str) -> RuntimeError { - let err = attribute_error(format!( - "'{}' object has no attribute '{}'", - obj.type_name_owned(), - name - )); - if let RuntimeError::PyException(pe) = &err { - if let Object::Instance(inst) = &pe.instance { - inst.slot_set("name", Object::from_str(name)); - inst.slot_set("obj", obj.clone()); + // Built in one step (message, `args` and both fields): a failing + // lookup under `getattr(o, n, default)` or `except AttributeError` + // is a hot path. + // (An instance's class name is borrowed, not copied.) + let cls = match obj { + Object::Instance(inst) => Some(inst.cls()), + _ => None, + }; + let owned; + let type_name: &str = match &cls { + Some(c) if c.c_tp_name.get().is_none() => &c.name, + _ => { + owned = obj.type_name_owned(); + &owned } - } - err + }; + let mut message = String::with_capacity(type_name.len() + name.len() + 30); + message.push('\''); + message.push_str(type_name); + message.push_str("' object has no attribute '"); + message.push_str(name); + message.push('\''); + let instance = crate::builtin_types::exception_from_parts_with( + crate::builtin_types::builtin_types() + .attribute_error + .clone(), + Some(Object::from_str(message)), + [("name", Object::from_str(name)), ("obj", obj.clone())], + ); + RuntimeError::PyException(PyException::new(instance)) } pub fn key_error(message: impl Into) -> RuntimeError { @@ -420,23 +439,18 @@ pub fn stop_async_iteration() -> RuntimeError { /// of a `return` statement. The wrapped value is exposed as `.value` /// on the exception instance. pub fn stop_iteration_with(value: Object) -> RuntimeError { - let pe = PyException::new(crate::builtin_types::make_exception_with_class( - crate::builtin_types::builtin_types().stop_iteration.clone(), - "", - )); - if let Object::Instance(ref inst) = pe.instance { - inst.slot_set("value", value.clone()); - // A bare `return` (value None) raises `StopIteration()` with - // *empty* args, so `str(e)` renders bare and `e.args` is `()` — - // CPython's `gen_return` only packs non-None return values. - let args = if matches!(value, Object::None) { - Object::new_tuple(Vec::new()) - } else { - Object::new_tuple_array([value]) - }; - inst.slot_set("args", args); - } - RuntimeError::PyException(pe) + // `value` is the return value; a bare `return` (value None) raises + // `StopIteration()` with *empty* args, so `str(e)` renders bare and + // `e.args` is `()` — CPython's `gen_return` only packs non-None + // return values. (The family's construction sets `.value` from the + // argument, `None` without one.) + let arg = (!matches!(value, Object::None)).then_some(value); + RuntimeError::PyException(PyException::new( + crate::builtin_types::exception_from_parts( + crate::builtin_types::builtin_types().stop_iteration.clone(), + arg, + ), + )) } pub fn not_implemented_error(message: impl Into) -> RuntimeError { diff --git a/crates/weavepy-vm/src/frame_jit.rs b/crates/weavepy-vm/src/frame_jit.rs index a788b681..0152e2b7 100644 --- a/crates/weavepy-vm/src/frame_jit.rs +++ b/crates/weavepy-vm/src/frame_jit.rs @@ -76,6 +76,10 @@ pub(crate) const RELOAD: u32 = 4; /// synced to the return with the value atop its stack: the caller /// finishes the return. const DIRECT_RET: u32 = 5; +/// A `CALL` of a coroutine function followed by an `await` of its result +/// started the coroutine, which returned (see [`gen_call_done`]): the +/// await's `END_SEND` goes on, `[coroutine, result]` atop the stack. +const AWAITED: u32 = 6; /// The heat per instruction of a code object at which it compiles (see /// `Slot::warm`; `WEAVEPY_FRAME_JIT_HOT` overrides it, a tuning aid). @@ -108,6 +112,12 @@ const MAX_FAILS: u8 = 32; /// The longest code compiled. const MAX_INSTRUCTIONS: usize = 4096; +/// An exit's packed constant (see `Lower::exit`): the stack depth in its +/// low bits, the pc from bit `EXIT_PC_SHIFT`, and the last instruction +/// from bit `EXIT_LAST_SHIFT` (both below `MAX_INSTRUCTIONS`). +const EXIT_PC_SHIFT: i64 = 20; +const EXIT_LAST_SHIFT: i64 = 42; + /// The running activation's state, as the core loop holds it: the native /// code reads it on entry and writes it back on exit. #[repr(C)] @@ -140,6 +150,10 @@ pub(crate) struct State { /// In a generator's fast step, the fast steps it is nested in (see /// `gen_fast`). pub(crate) gen_depth: u8, + /// A direct call's callee (see [`direct_call`]): its `RETURN_VALUE` + /// hands the return straight back (`DIRECT_RET`) for the caller to + /// finish, without [`h_return`]. + pub(crate) direct: bool, } const S_LOCALS: i32 = 0; @@ -153,7 +167,9 @@ const S_SNAP: i32 = 56; const S_DEAD: i32 = 64; const S_OUT: i32 = 80; const S_INTERP: i32 = std::mem::offset_of!(State, interp) as i32; +const S_SW: i32 = std::mem::offset_of!(State, sw) as i32; const S_FRAME: i32 = std::mem::offset_of!(State, frame) as i32; +const S_DIRECT: i32 = std::mem::offset_of!(State, direct) as i32; const _: () = { assert!(std::mem::offset_of!(State, locals) == S_LOCALS as usize); assert!(std::mem::offset_of!(State, stack) == S_STACK as usize); @@ -193,9 +209,21 @@ pub(crate) struct Native { _globals: Vec>, #[allow(clippy::vec_box)] _slots: Vec>, + /// The method-load sites' in-line caches. + #[allow(clippy::vec_box)] + _methods: Vec>, /// The `CALL` sites' direct-call caches. #[allow(clippy::vec_box)] _direct: Vec>, + /// The `CALL` sites' settled builtins. + #[allow(clippy::vec_box)] + _builtin_sites: Vec>, + #[allow(clippy::vec_box)] + _type_sites: Vec>, + /// The builtins the method kernels' calls address. + _held: Vec>, + #[allow(clippy::vec_box)] + _mods: Vec>, } // SAFETY: the code only touches the state it is handed; it is only @@ -231,6 +259,44 @@ impl Native { } } + /// [`Self::run`] for a direct call's callee, entered at `from` (its + /// start, unless a prologue the core loop ran came first): the + /// bookkeeping only for a run that didn't return. + #[inline(always)] + pub(crate) unsafe fn run_direct(&self, st: &mut State, from: usize) -> u32 { + let (len, cap) = (st.len, st.cap); + // SAFETY: the caller's contract. + let status = unsafe { (self.func)(st) }; + if status != DIRECT_RET || stats::enabled() { + self.ran(st, from, len, cap, usize::MAX, status); + } + status + } + + /// [`Self::run`]'s bookkeeping for a run from `from` (with the stack + /// `len` deep, `cap` its capacity, and `last` the last instruction). + #[cold] + #[inline(never)] + fn ran(&self, st: &State, from: usize, len: usize, cap: usize, last: usize, status: u32) { + if status == INTERP && st.pc == from && st.last == last { + self.note_fail(from); + } + if stats::enabled() { + let bail = if status != INTERP || st.pc != from { + "" + } else if cap < self.need { + "" + } else if self.depths.get(from).is_some_and(|&d| d != len as i64) { + "" + } else { + "" + }; + stats::note( + &self.name, &self.ops, from, st.pc, st.last, st.sw, status, bail, + ); + } + } + /// Run from `st.pc` until an instruction the core loop must run. /// /// # Safety @@ -257,7 +323,9 @@ impl Native { } else { "" }; - stats::note(&self.name, &self.ops, from, st.pc, status, bail); + stats::note( + &self.name, &self.ops, from, st.pc, st.last, st.sw, status, bail, + ); } status } @@ -322,6 +390,25 @@ impl Slot { } } + /// Count a compiled caller's call into an activation of this code that + /// had to switch to the core loop for want of a native body: the round + /// trip costs about what interpreting the whole body does, so it + /// counts the code's length (a call the core loop makes counts a + /// tenth of it), and a callee of compiled code compiles sooner. + #[inline] + pub(crate) fn warm_switched(&self, code: &CodeObject, ext: &CodeConstObjects, nlocals: usize) { + if self.native.get().is_some() { + return; + } + let n = code.instructions.len() as u32; + let h = self.heat.load(Ordering::Relaxed).saturating_add(n); + self.heat.store(h, Ordering::Relaxed); + if h >= hot().saturating_mul(n) { + self.heat.store(0, Ordering::Relaxed); + self.try_compile(code, ext, nlocals, Heat::Call); + } + } + #[cold] #[inline(never)] fn try_compile(&self, code: &CodeObject, ext: &CodeConstObjects, nlocals: usize, at: Heat) { @@ -404,6 +491,13 @@ fn worth_compiling(code: &CodeObject, ext: &CodeConstObjects, at: Heat) -> bool // A method call on a local runs through a helper without leaving, when // its callee runs in place. let mut helped = vec![false; ins.len()]; + // So does a call of a leaf builtin (`isinstance(x, C)`, `len(xs)`, + // `math.floor(x)`) the site has settled. + for (pc, h) in helped.iter_mut().enumerate() { + if ins[pc].op == OpCode::Call && crate::call_site_in_place(ext, pc) { + *h = true; + } + } for pc in 0..ins.len().saturating_sub(1) { if ins[pc].op == OpCode::LoadFast && ins[pc + 1].op == OpCode::LoadMethodAttr @@ -417,6 +511,80 @@ fn worth_compiling(code: &CodeObject, ext: &CodeConstObjects, at: Heat) -> bool } } } + // So do a `with` statement's `__enter__` and `__exit__` calls when + // its special-method sites found methods that run in place: the + // enter call follows its `LOAD_SPECIAL`, and a normal exit's + // `CALL 3` (over three `None`s) pairs with the innermost open exit + // site. + { + use weavepy_compiler::bytecode::{SPECIAL_ENTER, SPECIAL_EXIT}; + let mut open = Vec::new(); + for pc in 0..ins.len() { + let i = ins[pc]; + match i.op { + OpCode::LoadSpecial if i.arg == SPECIAL_EXIT => open.push(pc), + OpCode::LoadSpecial if i.arg == SPECIAL_ENTER => { + if ins + .get(pc + 1) + .is_some_and(|c| c.op == OpCode::Call && c.arg == 0) + && crate::method_site_in_place(ext, pc) + { + helped[pc + 1] = true; + } + } + OpCode::Call + if i.arg == 3 + && pc >= 3 + && ins[pc - 3..pc].iter().all(|c| { + c.op == OpCode::LoadConst + && matches!( + code.constants.get(c.arg as usize), + Some(weavepy_compiler::Constant::None) + ) + }) => + { + if open + .pop() + .is_some_and(|x| crate::method_site_in_place(ext, x)) + { + helped[pc] = true; + } + } + _ => {} + } + } + } + // A generator expression's creation (`MAKE_FUNCTION`, the iterable, + // `GET_ITER`, `CALL 0`) runs in place through the call helper. + for pc in 1..ins.len() { + if ins[pc].op == OpCode::Call && ins[pc].arg == 0 && ins[pc - 1].op == OpCode::GetIter { + let made = (pc.saturating_sub(16)..pc) + .rev() + .find(|&k| ins[k].op == OpCode::MakeFunction) + .filter(|&k| k > 0 && ins[k - 1].op == OpCode::LoadConst) + .and_then(|k| code.constants.get(ins[k - 1].arg as usize)); + if matches!(made, Some(weavepy_compiler::Constant::Code(c)) if c.is_generator) { + helped[pc] = true; + } + } + } + // The fallback of an inlined `tuple(...)`, `list(...)`, `all(...)` or + // `any(...)` of a generator expression (`LOAD_COMMON_CONSTANT; IS_OP; + // POP_JUMP_IF_FALSE` to the plain call, which the inlined loop jumps + // over) runs only when the name is rebound: its calls don't count. + let mut cold = vec![false; ins.len()]; + for pc in 0..ins.len().saturating_sub(2) { + if ins[pc].op == OpCode::LoadCommonConstant + && ins[pc + 1].op == OpCode::IsOp + && ins[pc + 2].op == OpCode::PopJumpIfFalse + { + let from = pc + 3 + ins[pc + 2].arg as usize; + if from > pc + 3 && from <= ins.len() && ins[from - 1].op == OpCode::JumpForward { + let to = (from + ins[from - 1].arg as usize).min(ins.len()); + cold[from..to].iter_mut().for_each(|c| *c = true); + } + } + } let t = tuning(); // What running an instruction natively saves, in halves of an // in-line instruction's: one run in line saves its whole dispatch and @@ -425,7 +593,14 @@ fn worth_compiling(code: &CodeObject, ext: &CodeConstObjects, at: Heat) -> bool // a round trip. let gain = |k: usize| -> Option { let op = ins[k].op; - if helped[k] { + // A call runs through its helpers (`call_op`), as the core loop's + // arm runs it: a compiled callee is called directly, any other + // activation switched to without a round trip through the loop. + if helped[k] || matches!(op, OpCode::Call | OpCode::CallKw | OpCode::CallEx) { + return Some(1); + } + // A forwarding call's merge runs with its call (`call_forward`). + if op == OpCode::DictUpdate && k >= 2 && crate::forward_call_shape(code, k - 2) { return Some(1); } if !native_at(code, k) { @@ -458,12 +633,17 @@ fn worth_compiling(code: &CodeObject, ext: &CodeConstObjects, at: Heat) -> bool | OpCode::ListToTuple | OpCode::UnpackEx | OpCode::LoadSuperAttr + | OpCode::LoadSpecial | OpCode::PushExcInfo | OpCode::CheckExcMatch | OpCode::PopExcept | OpCode::DeleteFast | OpCode::StoreSlice - | OpCode::DeleteSubscr => false, + | OpCode::DeleteSubscr + | OpCode::GetAwaitable + | OpCode::GetYieldFromIter + | OpCode::Send + | OpCode::EndSend => false, _ => true, }; Some(if in_line { 2 } else { 1 }) @@ -506,6 +686,9 @@ fn worth_compiling(code: &CodeObject, ext: &CodeConstObjects, at: Heat) -> bool let top = (pc + 1).saturating_sub(i.arg as usize); let (mut n, mut exits) = (0usize, 0usize); for (k, ins_k) in ins.iter().enumerate().take(pc + 1).skip(top) { + if cold[k] { + continue; + } match gain(k) { Some(g) => n += g, // (A loop's epilogue inside a region a handler's back edge @@ -515,9 +698,13 @@ fn worth_compiling(code: &CodeObject, ext: &CodeConstObjects, at: Heat) -> bool ins_k.op, OpCode::EndFor | OpCode::PopIter | OpCode::ReturnValue ) => {} - // A generator step ends at its yield whether or not the - // body runs natively: no round trip to pay for. - None if ins_k.op == OpCode::YieldValue && matches!(at, Heat::Step) => {} + // A resume ends at its yield whether or not the body runs + // natively: no round trip to pay for. + None if ins_k.op == OpCode::YieldValue + && (matches!(at, Heat::Step) + || code.is_generator + || code.is_coroutine + || code.is_async_generator) => {} None => exits += 1, } } @@ -615,12 +802,25 @@ mod stats { type Counts = HashMap<(String, String), [u64; 2]>; - static ON: std::sync::OnceLock = std::sync::OnceLock::new(); + /// `0` until decided, then `1` off or `2` on (one load per test: every + /// direct call's return tests it). + static ON: std::sync::atomic::AtomicU8 = std::sync::atomic::AtomicU8::new(0); static COUNTS: Mutex> = Mutex::new(None); #[inline(always)] pub(super) fn enabled() -> bool { - *ON.get_or_init(|| { + match ON.load(std::sync::atomic::Ordering::Relaxed) { + 1 => false, + 2 => true, + _ => decide(), + } + } + + #[cold] + #[inline(never)] + fn decide() -> bool { + static ONCE: std::sync::OnceLock = std::sync::OnceLock::new(); + let on = *ONCE.get_or_init(|| { let on = std::env::var_os("WEAVEPY_FRAME_JIT_STATS").is_some(); if on { extern "C" fn dump() { @@ -647,7 +847,29 @@ mod stats { unsafe { libc::atexit(dump) }; } on - }) + }); + ON.store(if on { 2 } else { 1 }, std::sync::atomic::Ordering::Relaxed); + on + } + + /// [`super::run_pushed_directly`] declined, for `why`: `None`. + #[inline(always)] + pub(super) fn declined(why: &'static str) -> Option { + if enabled() { + note_declined(why); + } + None + } + + #[cold] + #[inline(never)] + fn note_declined(why: &'static str) { + let mut counts = COUNTS.lock().unwrap_or_else(|e| e.into_inner()); + let e = counts + .get_or_insert_with(HashMap::new) + .entry(("".to_owned(), why.to_owned())) + .or_default(); + e[0] += 1; } #[cold] @@ -656,13 +878,34 @@ mod stats { ops: &[OpCode], from: usize, at: usize, + last: usize, + sw: *mut crate::CoreSwitch, status: u32, bail: &str, ) { let op = match (status, ops.get(at)) { (0, Some(op)) => format!("{op:?}{bail}"), (0, None) => "".to_owned(), - (super::RELOAD, _) => "".to_owned(), + // (Where it switched: the last instruction it ran, and the + // activation it switched to.) + (super::RELOAD, _) => { + let to = if sw.is_null() { + weavepy_compiler::Name::default() + } else { + // SAFETY: a live switch's running activation. + unsafe { + let cur: &crate::Frame = &*(*sw).cur; + cur.code.qualname.clone() + } + }; + match ops.get(last) { + Some(op) => format!( + " at {op:?}@{last}, {:?} to {to}", + ops.get(last + 1) + ), + None => "".to_owned(), + } + } (super::RAISED, _) => "".to_owned(), (super::DIRECT_RET, _) => "".to_owned(), _ => "".to_owned(), @@ -698,10 +941,22 @@ struct Tags { /// payload word: `(length, first item)` byte offsets. tuple: u8, tuple_layout: Option<(i32, i32)>, + /// The `dict`, `set` and `str` tags (the method kernels' receivers). + dict: u8, + set: u8, + str: u8, + /// A module's tag, and where its dict's data is (see + /// [`module_layout`]). + module: u8, + module_layout: Option<(i32, i32)>, /// The heap variants whose payload word is an `Rc`'s allocation, its /// strong count the allocation's first word (a clone is an increment /// there): instances, lists, dicts and classes, as far as measured. rc_counted: i64, + /// The heap variants whose payload word addresses a shared payload + /// with its strong count two words before it (see `rc::strong_word`): + /// strings and tuples, as far as measured. + rc_counted_hdr: i64, /// The heap variants whose identity is their payload pointer (and so /// `is` compares payload words): instances, strings, lists, dicts, /// tuples, classes. @@ -733,6 +988,18 @@ fn tags() -> Option { unsafe { *std::ptr::from_ref(v).cast::().add(1) } }; let cell = Object::Cell(Rc::new(crate::sync::RefCell::new(Object::None))); + let func = { + let dict = Rc::new(crate::sync::RefCell::new(crate::object::DictData::default())); + crate::new_function( + Rc::new(CodeObject::default()), + &dict, + &dict, + Vec::new(), + Vec::new(), + Vec::new(), + None, + ) + }; let inst = Object::Instance(Rc::new(crate::types::PyInstance::new( crate::builtin_types::builtin_types().object_.clone(), ))); @@ -754,18 +1021,7 @@ fn tags() -> Option { float: tag(&Object::Float(1.0)), cell: tag(&cell), instance: tag(&inst), - function: { - let dict = Rc::new(crate::sync::RefCell::new(crate::object::DictData::default())); - tag(&crate::new_function( - Rc::new(CodeObject::default()), - &dict, - &dict, - Vec::new(), - Vec::new(), - Vec::new(), - None, - )) - }, + function: tag(&func), list: tag(&Object::new_list(Vec::new())), list_layout: list_layout(), tuple: tag(&Object::new_tuple_array([Object::None])), @@ -779,11 +1035,33 @@ fn tags() -> Option { &Object::new_list(Vec::new()), &Object::new_dict(), &Object::Type(crate::builtin_types::builtin_types().object_.clone()), + &func, + &Object::new_set(), + &Object::Builtin(Rc::new(crate::object::BuiltinFn::new("sample", |_| { + Ok(Object::None) + }))), ] .into_iter() .filter(|o| tag(o) < 64 && counted_at_payload(o, word(o))) .fold(0, |m, o| m | (1i64 << tag(o))) }, + dict: tag(&Object::new_dict()), + set: tag(&Object::new_set()), + str: tag(&Object::from_str("")), + module: tag(&sample_module()), + module_layout: module_layout(), + rc_counted_hdr: if cfg!(debug_assertions) { + 0 + } else { + // (A fresh string: the small ones are shared statics.) + [ + &Object::from_str("not a small string"), + &Object::new_tuple_array([Object::None, Object::None]), + ] + .into_iter() + .filter(|o| tag(o) < 64 && word(o) >= 16 && counted_at_payload(o, word(o) - 16)) + .fold(0, |m, o| m | (1i64 << tag(o))) + }, by_pointer: samples .iter() .fold(0, |m, &t| if t < 64 { m | (1i64 << t) } else { m }), @@ -878,6 +1156,38 @@ fn tuple_layout() -> Option<(i32, i32)> { .then(|| Some((i32::try_from(len * 8).ok()?, i32::try_from(items).ok()?)))? } +/// A private module to measure against (never seen by Python code). +fn sample_module() -> Object { + Object::Module(Rc::new(crate::object::PyModule { + name: String::new(), + filename: None, + dict: Rc::new(crate::sync::RefCell::new(crate::object::DictData::default())), + })) +} + +/// Where a module's dict is, read off a sample module (`None` if it isn't +/// the shape the code assumes): the byte offset, from its payload word, of +/// its dict handle (a word), and from that handle's value, of the dict's +/// data (where its stamp and entries are). A module's dict is fixed for +/// its lifetime. +fn module_layout() -> Option<(i32, i32)> { + let m = sample_module(); + // SAFETY: every `Object` is 16 bytes; a module's second word addresses + // its payload. + let word = unsafe { *std::ptr::from_ref(&m).cast::().add(1) } as usize; + let Object::Module(pm) = &m else { + return None; + }; + let field = std::ptr::from_ref(&pm.dict) as usize; + let handle_at = field.checked_sub(word)?; + // SAFETY: the dict handle is one word inside the live sample. + let handle = unsafe { std::ptr::read(field as *const usize) }; + let cell: &crate::sync::RefCell = &pm.dict; + let data_at = (cell.as_ptr() as usize).checked_sub(handle)?; + (std::mem::size_of::>>() == 8) + .then(|| Some((i32::try_from(handle_at).ok()?, i32::try_from(data_at).ok()?)))? +} + /// Whether cloning `o` (whose payload word is `w`) adds one to the word at /// `w` and nothing else measurable, and dropping the clone takes it away. fn counted_at_payload(o: &Object, w: u64) -> bool { @@ -942,8 +1252,72 @@ unsafe extern "C" fn h_store(st: *mut State, slot: *mut Object, i: u64) -> u32 { /// `FOR_ITER` over a range, list or tuple iterator at `it` (the next value /// goes to `out`, the slot above): `0` an `int` in `st.out`, `1` another /// value written to `out`, `2` the exhausted iterator retired (it left the -/// stack), anything else declined. +/// stack), anything else declined. The commonest steps (a live range, a +/// list's or tuple's next item) run here; everything else (exhaustion, a +/// generator, the other iterators) in [`h_for_iter_rest`]. unsafe extern "C" fn h_for_iter(st: *mut State, it: *mut Object, out: *mut Object, pc: u64) -> u32 { + // SAFETY: as `h_for_iter_rest`'s; nothing here runs code while the + // iterator is borrowed. + unsafe { + if let Object::Iter(rc) = &*it { + if let Some(iter) = rc.peek_mut() { + let v = match iter { + PyIterator::Range { + current, + stop, + step, + } if *step > 0 && *current < *stop => { + (*st).out = *current as u64; + *current = current.wrapping_add(*step); + return 0; + } + PyIterator::List { items, index, .. } => { + match items.peek().and_then(|xs| xs.get(*index)) { + Some(v) => { + *index += 1; + v + } + None => return h_for_iter_rest(st, it, out, pc), + } + } + PyIterator::Tuple { items, index } => match items.get(*index) { + Some(v) => { + *index += 1; + v + } + None => return h_for_iter_rest(st, it, out, pc), + }, + // A string's next ASCII character (a shared one). + PyIterator::Str { s, index } => match s.as_bytes().get(*index) { + Some(&c) if c < 0x80 => { + *index += 1; + out.write(Object::Str(crate::shared_value::SharedStr::ascii_char(c))); + return 1; + } + _ => return h_for_iter_rest(st, it, out, pc), + }, + _ => return h_for_iter_rest(st, it, out, pc), + }; + if let Object::Int(i) = *v { + (*st).out = i as u64; + return 0; + } + out.write(crate::clone_hot(v)); + return 1; + } + } + h_for_iter_rest(st, it, out, pc) + } +} + +/// [`h_for_iter`]'s other shapes. +#[inline(never)] +unsafe extern "C" fn h_for_iter_rest( + st: *mut State, + it: *mut Object, + out: *mut Object, + pc: u64, +) -> u32 { // SAFETY: the code passes its live state, an initialized slot with a // free one above it, and its `FOR_ITER`'s pc. let (st, top) = unsafe { (&mut *st, &*it) }; @@ -1005,6 +1379,30 @@ unsafe extern "C" fn h_for_iter(st: *mut State, it: *mut Object, out: *mut Objec *sw.last = st.last; if !interp.core_gen_resume(sw, pc as usize, crate::InlineResume::ForIter) { sw.pending = Some(crate::CoreExit::Stop(crate::LeafStop::Step)); + return FOR_SWITCHED; + } + // A collapsed chain's fast step delivered the value without + // a switch (see `Interpreter::chain_step`). + if std::ptr::eq(sw.cur, st.frame) { + return if sw.pending.is_none() { + 1 + } else { + FOR_SWITCHED + }; + } + // A compiled body runs from here; its yield (the value on + // top, past the instruction) or its return (the iterator + // gone, past the loop) continues this code natively. + if run_switched_directly(st) { + let frame = &*st.frame; + let at = frame.pc as usize; + let depth = frame.stack.len(); + if at == pc as usize + 1 && depth == len + 1 { + return 1; + } + if depth == len - 1 && at == for_iter_exit(&frame.code, pc as usize) { + return 2; + } } } return FOR_SWITCHED; @@ -1054,19 +1452,20 @@ unsafe extern "C" fn h_for_iter(st: *mut State, it: *mut Object, out: *mut Objec None => 3, }; } - // A native adapter whose step runs no code (`zip` of native - // iterators, `itertools.repeat`, ...); its exhaustion is the - // interpreter's. + // A native adapter: a step that runs no code (`zip` of native + // iterators, `map` with a pure callback, ...) in place; any other + // (a Python callback, exhaustion) through the core loop's lane. Object::LazyIter(l) => { // SAFETY: the code passes its live state, whose interpreter // is dormant while the helper runs. let interp = unsafe { &*st.interp }; - let Some(Some(v)) = interp.lazy_core_next(l) else { - return 3; - }; - // SAFETY: the slot above the iterator is free. - unsafe { out.write(v) }; - return 1; + if let Some(Some(v)) = interp.lazy_core_next(l) { + // SAFETY: the slot above the iterator is free. + unsafe { out.write(v) }; + return 1; + } + // SAFETY: as above. + return unsafe { for_iter_lane(st, it, pc) }; } _ => return 3, }; @@ -1091,9 +1490,10 @@ unsafe extern "C" fn h_for_iter(st: *mut State, it: *mut Object, out: *mut Objec *current = current.wrapping_add(*step); return 0; } - if !unique { - return 3; - } + // The exhausted iterator leaves the stack, as the core loop's + // arm retires it: it holds nothing, so its release (the last + // or, a generator expression's `.0` holding it too, not) runs + // no code. // SAFETY: the iterator leaves the stack. drop(unsafe { it.read() }); return 2; @@ -1113,7 +1513,19 @@ unsafe extern "C" fn h_for_iter(st: *mut State, it: *mut Object, out: *mut Objec *index += 1; v } - None if unique && owner.is_none() => { + // A shared iterator (a generator expression's `.0`, which + // its local holds too) detaches from the list, as the core + // loop's arm does, so a later append can't resurrect it + // (when the list lives on, or holds only plain scalars: its + // release frees nothing that could finalize). + None if owner.is_none() + && (unique + || crate::sync::Rc::strong_count(items) > 1 + || xs.iter().all(plain_scalar)) => + { + if !unique { + *items = crate::sync::Rc::new(crate::sync::RefCell::new(Vec::new())); + } // SAFETY: as above. drop(unsafe { it.read() }); return 2; @@ -1123,7 +1535,21 @@ unsafe extern "C" fn h_for_iter(st: *mut State, it: *mut Object, out: *mut Objec } PyIterator::Tuple { items, index } => { let Some(v) = items.get(*index).cloned() else { - return 3; + // The exhausted iterator leaves the stack (as the core + // loop's arm retires it), when its release can't free the + // tuple (whose items could queue finalizers): a shared + // iterator stays exhausted, the tuple immutable. + // (Items that finalize nothing free in place: a temporary + // tuple of names, `for k in key[:-1]`.) + if unique + && crate::shared_value::ThinArc::strong_count(items) == 1 + && !items.iter().all(plain_scalar) + { + return 3; + } + // SAFETY: the iterator leaves the stack. + drop(unsafe { it.read() }); + return 2; }; *index += 1; v @@ -1162,30 +1588,68 @@ unsafe extern "C" fn h_for_iter(st: *mut State, it: *mut Object, out: *mut Objec }; let i = *count; *count += 1; - Object::new_tuple_array([Object::Int(i), x]) + // (From the tuple free list.) + // SAFETY: the running thread's interpreter, dormant while the + // helper runs. + unsafe { (*st.interp).alloc_tuple_array([Object::Int(i), x]) } } // A set's next element while the set keeps its size (a change, // and exhaustion, are the core loop's to report). PyIterator::Set { set, len, index } => { - let Ok(items) = set.try_borrow() else { + // SAFETY: as above (a distinct cell; the read runs no code). + let Some(items) = (unsafe { set.peek() }) else { return 3; }; if items.len() != *len { return 3; } let Some(k) = items.get_index(*index) else { - return 3; + // Exhausted: the iterator leaves the stack when its release + // can't free the set (shared, or the set lives on). + if unique && crate::sync::Rc::strong_count(set) == 1 { + return 3; + } + // SAFETY: as above. + drop(unsafe { it.read() }); + return 2; }; let v = crate::clone_hot(&k.0); *index += 1; v } + // A dict or dict view's next key, value or `(key, value)` item, as + // the core loop's arm steps it (a change of size, a reverse view, an + // exhaustion that could release anything are its own). + view @ PyIterator::DictKeys { .. } => { + match Interpreter::core_dict_next(view, false, unique) { + crate::DictStep::Item(v, _) => v, + crate::DictStep::Exhausted => { + // SAFETY: the iterator, held by the stack alone, leaves + // it (its dict lives on). + drop(unsafe { it.read() }); + return 2; + } + crate::DictStep::Decline => return 3, + } + } // Any other cursor whose step runs no code (a string's, bytes'); // its exhaustion is the core loop's. other if other.pure_ready() => match other.next_value() { Some(v) => v, None => return 3, }, + // An exhausted string's or bytes' cursor leaves the stack, as a + // range's does (shared or not): releasing it runs no code. + PyIterator::Str { s, index } if *index >= s.len() => { + // SAFETY: as above. + drop(unsafe { it.read() }); + return 2; + } + PyIterator::Bytes { data, index } if *index >= data.len() => { + // SAFETY: as above. + drop(unsafe { it.read() }); + return 2; + } _ => return 3, }; if let Object::Int(i) = v { @@ -1197,6 +1661,142 @@ unsafe extern "C" fn h_for_iter(st: *mut State, it: *mut Object, out: *mut Objec 1 } +/// `FOR_ITER` fused with the `UNPACK_SEQUENCE 2` after it, for an iterator +/// at `it` whose next step is a pair and runs no code: `enumerate` over a +/// cursor, a dict's items, a two-source `zip`, or a list's or tuple's next +/// item when it is an exact pair. `0` the pair's second item written to +/// `out` and its first above it (as the unpacking leaves them, no tuple +/// built), anything else declined untouched (the unfused helpers take it, +/// exhaustion included). +unsafe extern "C" fn h_for_iter_pair(it: *mut Object, out: *mut Object) -> u32 { + // SAFETY: the code passes an initialized slot with two free ones above + // it; nothing below runs code while the iterator is borrowed. + unsafe { + let pair = match &*it { + Object::Iter(rc) => { + let Some(iter) = rc.peek_mut() else { + return 3; + }; + match iter { + PyIterator::List { + items, + index, + owner: None, + } => { + let Some(Object::Tuple(t)) = items.peek().and_then(|xs| xs.get(*index)) + else { + return 3; + }; + let [a, b] = &t[..] else { + return 3; + }; + let pair = (crate::clone_hot(a), crate::clone_hot(b)); + *index += 1; + pair + } + PyIterator::Tuple { items, index } => { + let Some(Object::Tuple(t)) = items.get(*index) else { + return 3; + }; + let [a, b] = &t[..] else { + return 3; + }; + let pair = (crate::clone_hot(a), crate::clone_hot(b)); + *index += 1; + pair + } + // (An items view's fused step gives the key apart; its + // exhaustion, declined here, is the unfused helper's.) + view @ PyIterator::DictKeys { + kind: crate::object::DictViewKind::Items, + .. + } => match Interpreter::core_dict_next(view, true, false) { + crate::DictStep::Item(v, Some(k)) => (k, v), + crate::DictStep::Item(..) => unreachable!("an items view's fused step"), + _ => return 3, + }, + _ => match crate::seqiter::enumerate_pure_pair(&*it) { + Some(pair) => pair, + None => return 3, + }, + } + } + Object::LazyIter(l) => match crate::seqiter::lazy_pure_pair(l) { + Some(pair) => pair, + None => return 3, + }, + _ => return 3, + }; + out.write(pair.1); + out.add(1).write(pair.0); + 0 + } +} + +/// The `FOR_ITER` at `pc` over the native adapter at `it` (the stack's top) +/// whose step may run Python code (a `map` over a Python function), as the +/// core loop's lane runs it (`Interpreter::core_for_iter_lane`): the frame +/// synced and waiting on the pending list meanwhile. [`h_for_iter`]'s +/// results: `1` the item above the iterator, `2` the exhausted iterator +/// retired, `FOR_SWITCHED` anything else for the core loop (a raise, a +/// pending stop; the frame synced past the instruction), `3` nothing done. +/// +/// # Safety +/// +/// As [`h_for_iter_rest`]'s. +#[inline(never)] +unsafe fn for_iter_lane(st: &mut State, it: *mut Object, pc: u64) -> u32 { + // SAFETY: the caller's contract. + unsafe { + if st.sw.is_null() || !std::ptr::eq((*st.sw).cur, st.frame) { + return 3; + } + let pc = pc as usize; + let slot = it.offset_from(st.stack) as usize; + let frame = &mut *st.frame; + frame.stack.set_len(slot + 1); + frame.pc = pc as u32; + let sw = &mut *st.sw; + *sw.last = st.last; + let interp = &mut *st.interp.cast_mut(); + if !interp.core_for_iter_lane(sw) { + return 3; + } + let frame = &*st.frame; + if sw.pending.is_none() + && std::ptr::eq(sw.cur, st.frame) + && crate::hot_gates::loop_gen() == st.snap_gen + { + let at = frame.pc as usize; + let depth = frame.stack.len(); + if at == pc + 1 && depth == slot + 2 { + return 1; + } + if depth == slot && at == for_iter_exit(&frame.code, pc) { + return 2; + } + } + FOR_SWITCHED + } +} + +/// Whether releasing `x` frees nothing that could finalize. +fn plain_scalar(x: &Object) -> bool { + matches!( + x, + Object::Int(_) | Object::Float(_) | Object::Bool(_) | Object::None | Object::Str(_) + ) +} + +/// Whether the `FOR_ITER` at `pc` of `code` unpacks a pair (the +/// `UNPACK_SEQUENCE 2` after it), which [`h_for_iter_pair`] fuses. +fn fused_pair_at(code: &CodeObject, pc: usize) -> bool { + let op = |pc: usize| code.instructions.get(pc).map(|i| (i.op, i.arg)); + matches!(op(pc), Some((OpCode::ForIter, _))) + && matches!(op(pc + 1), Some((OpCode::UnpackSequence, 2))) + && pc + 2 < code.instructions.len() +} + /// [`h_for_iter`] switched to a generator's activation (`RELOAD`). const FOR_SWITCHED: u32 = 4; /// [`h_for_iter`]'s iterator raised (`RAISED`, the state past it). @@ -1219,40 +1819,649 @@ unsafe extern "C" fn h_list_append(list: *const Object, value: *const Object) -> } } -/// [`h_container`]'s raise: the error in `st`, `st.len` and `st.pc` past -/// the instruction. -const CONTAINER_RAISED: u64 = u64::MAX - 1; +/// A method kernel: `recv.m(a, b)` for an exact `list`, `dict`, `set` or +/// `str` receiver (its tag checked by the caller), with the arguments the +/// site passes (null past them) read in place, and the method's builtin +/// `f` (for the kernels that run its body): `0` the result written to the +/// free slot `out`, anything else declined untouched (the call then runs +/// as before). A kernel runs no Python code, raises nothing, and releases +/// nothing that could run a finalizer. +type Kernel = unsafe extern "C" fn( + out: *mut Object, + recv: *const Object, + a: *const Object, + b: *const Object, + f: *const crate::object::BuiltinFn, +) -> u32; + +/// The kernel for the `tag` receiver's method of leaf kind `kind` called +/// with `nargs` arguments (see [`Lower::method_kernel`]). +fn kernel_for(tag: u64, kind: crate::LeafKind, nargs: usize) -> Option { + use crate::LeafKind as K; + Some(match (tag, kind, nargs) { + (1, K::ListAppend, 1) => k_list_append, + (1, K::ListPop, 0) => k_list_pop, + (1, K::ListExtend, 1) => k_list_extend, + (1, K::ListInsert, 2) => k_list_insert, + (1, K::ListReverse | K::ListCopy, 0) => k_body, + (2, K::DictGet, 1 | 2) => k_dict_get, + (2, K::DictKeys | K::DictValues | K::DictItems, 0) => k_body, + (3, K::SetPop, 0) => k_body, + (3, K::SetAdd, 1) => k_set_add, + (3, K::SetDiscard, 1) => k_set_discard, + (3, K::SetRemove, 1) => k_set_remove, + (4, K::StrStartswith, 1 | 2) => k_str_startswith, + (4, K::StrEndswith, 1 | 2) => k_str_endswith, + (4, K::StrIsdigit, 0) => k_str_isdigit, + (4, K::StrIsalpha, 0) => k_str_isalpha, + (4, K::StrIsspace, 0) => k_str_isspace, + (4, K::StrFind, 1 | 2) => k_str_find, + (4, K::StrLower | K::StrUpper, 0) => k_body, + (4, K::StrStrip | K::StrLstrip | K::StrRstrip, 0 | 1) => k_str_strip, + (4, K::StrSplit, 0 | 1) => k_str_split, + (4, K::StrJoin, 1) => k_str_join, + (4, K::StrReplace, 2) => k_str_replace, + (4, K::StrFormat, 0..=2) => k_str_format, + (4, K::Opaque, _) => k_body, + _ => return None, + }) +} -/// A container instruction (`BINARY_SUBSCR`, `BINARY_SLICE`, `STORE_SUBSCR`, -/// `LIST_APPEND`, `UNPACK_SEQUENCE`, `UNPACK_EX`, `LOAD_SUPER_ATTR`, and an -/// `except` clause's entry, test and exit; the one at `ins`, the `pc`th of -/// `code`) on the top of a `len`-deep stack, as the core loop's arm runs -/// it: the new depth, [`CONTAINER_RAISED`] (only when `can_raise`: the -/// whole stack is on the frame's), or `u64::MAX` declined untouched. -unsafe extern "C" fn h_container( - st: *mut State, - ins: *const weavepy_compiler::Instruction, - code: *const CodeObject, - pc: u64, - len: u64, - can_raise: u64, -) -> u64 { - // SAFETY: the code passes its live state, one of its own instructions - // and its code, and its stack depth. +/// The method's own body on bitwise views of the operands (as the core +/// loop's leaf call runs it): `0` its result written to `out`, anything +/// else (an error, which the full call raises) declined. +/// +/// # Safety +/// +/// As [`Kernel`]'s, for a builtin whose body runs no Python code on +/// these operands. +unsafe fn run_body( + out: *mut Object, + recv: *const Object, + a: *const Object, + b: *const Object, + f: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: the caller's contract; the views are never dropped. unsafe { - let st = &mut *st; - let (ins, len) = (*ins, len as usize); - if ins.op == OpCode::LoadSuperAttr { - return Interpreter::core_super_attr(&*code, ins, pc as usize, st.stack, len) - .map_or(u64::MAX, |n| n as u64); - } - if matches!( - ins.op, + let views = std::mem::ManuallyDrop::new([ + recv.read(), + if a.is_null() { + Object::Unbound + } else { + a.read() + }, + if b.is_null() { + Object::Unbound + } else { + b.read() + }, + ]); + let n = 1 + usize::from(!a.is_null()) + usize::from(!b.is_null()); + let f = &*f; + let r = match f.call_kw.as_ref() { + Some(ckw) => ckw(&views[..n], &[]), + None => (f.call)(&views[..n]), + }; + match r { + Ok(v) => { + out.write(v); + 0 + } + Err(_) => 1, + } + } +} + +unsafe extern "C" fn k_list_append( + out: *mut Object, + recv: *const Object, + a: *const Object, + _: *const Object, + _: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s; growing the list runs no code. + unsafe { + let Object::List(l) = &*recv else { + return 1; + }; + let Some(items) = l.peek_mut() else { + return 1; + }; + crate::push_fast(items, crate::clone_hot(&*a)); + out.write(Object::None); + 0 + } +} + +unsafe extern "C" fn k_list_extend( + out: *mut Object, + recv: *const Object, + a: *const Object, + _: *const Object, + _: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s; copying an exact list's or tuple's items runs + // no code. + unsafe { + let Object::List(l) = &*recv else { + return 1; + }; + match &*a { + // (`xs.extend(xs)` reads the length once: it doubles.) + Object::List(src) if Rc::ptr_eq(l, src) => { + let Some(xs) = l.peek_mut() else { + return 1; + }; + let copy: Vec = xs.iter().map(crate::clone_hot).collect(); + xs.extend(copy); + } + Object::List(src) => { + let (Some(s), Some(xs)) = (src.peek(), l.peek_mut()) else { + return 1; + }; + xs.extend(s.iter().map(crate::clone_hot)); + } + Object::Tuple(t) => { + let Some(xs) = l.peek_mut() else { + return 1; + }; + xs.extend(t.iter().map(crate::clone_hot)); + } + _ => return 1, + } + out.write(Object::None); + 0 + } +} + +unsafe extern "C" fn k_list_pop( + out: *mut Object, + recv: *const Object, + _: *const Object, + _: *const Object, + _: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s; the item moves out. + unsafe { + let Object::List(l) = &*recv else { + return 1; + }; + let Some(v) = l.peek_mut().and_then(Vec::pop) else { + return 1; + }; + out.write(v); + 0 + } +} + +unsafe extern "C" fn k_dict_get( + out: *mut Object, + recv: *const Object, + a: *const Object, + b: *const Object, + _: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s; the probe runs no code. + unsafe { + let (Object::Dict(d), k) = (&*recv, &*a) else { + return 1; + }; + let Some(probe) = crate::object::LeafProbe::new(k) else { + return 1; + }; + let Some(m) = d.peek() else { + return 1; + }; + let v = match m.get_hot(&probe) { + Some(v) => crate::clone_hot(v), + None if probe.miss_is_exact() => { + if b.is_null() { + Object::None + } else { + crate::clone_hot(&*b) + } + } + None => return 1, + }; + out.write(v); + 0 + } +} + +unsafe extern "C" fn k_set_add( + out: *mut Object, + recv: *const Object, + a: *const Object, + _: *const Object, + _: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s; hashing and comparing a `str`, an `int` or a + // tuple of them runs no code. + unsafe { + let (Object::Set(s), k) = (&*recv, &*a) else { + return 1; + }; + if !matches!(k, Object::Str(_) | Object::Int(_) | Object::Tuple(_)) { + return 1; + } + let Some(probe) = crate::object::LeafProbe::new(k) else { + return 1; + }; + let Some(m) = s.peek_mut() else { + return 1; + }; + if m.get_index_of(&probe).is_none() { + // (A key of another kind that may equal it: the full call's.) + if !probe.miss_is_exact() { + return 1; + } + m.insert(crate::object::DictKey(crate::clone_hot(k))); + } + out.write(Object::None); + 0 + } +} + +/// `set.discard` (`remove`: a miss declines, for the full call's +/// `KeyError`) of a key that compares natively (see `LeafProbe`): the +/// removed key is the same object, or an equal `str`, `int` or tuple of +/// them, so its release frees nothing that runs code. +unsafe fn set_take(out: *mut Object, recv: *const Object, a: *const Object, remove: bool) -> u32 { + // SAFETY: as `Kernel`'s. + unsafe { + let (Object::Set(s), k) = (&*recv, &*a) else { + return 1; + }; + let Some(probe) = crate::object::LeafProbe::new(k) else { + return 1; + }; + let Some(m) = s.peek_mut() else { + return 1; + }; + match m.swap_take(&probe) { + Some(key) => crate::drop_hot(key.0), + None if !remove && probe.miss_is_exact() => {} + None => return 1, + } + out.write(Object::None); + 0 + } +} + +unsafe extern "C" fn k_set_discard( + out: *mut Object, + recv: *const Object, + a: *const Object, + _: *const Object, + _: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s. + unsafe { set_take(out, recv, a, false) } +} + +unsafe extern "C" fn k_set_remove( + out: *mut Object, + recv: *const Object, + a: *const Object, + _: *const Object, + _: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s. + unsafe { set_take(out, recv, a, true) } +} + +/// The receiver's and the first argument's text, both exact `str`s. +/// +/// # Safety +/// +/// As [`Kernel`]'s. +unsafe fn two_strs<'s>( + recv: *const Object, + a: *const Object, +) -> Option<( + &'s crate::shared_value::SharedStr, + &'s crate::shared_value::SharedStr, +)> { + // SAFETY: the caller's contract. + match unsafe { (&*recv, &*a) } { + (Object::Str(s), Object::Str(p)) => Some((s, p)), + _ => None, + } +} + +/// The text from character `start` (a `str` method's optional start +/// position, null for none) of the receiver `s`, when `s` is ASCII (its +/// byte offsets are its indices): `Some(None)` for a start past the end +/// (the methods' "not found"), `None` to decline. +/// +/// # Safety +/// +/// As [`Kernel`]'s. +unsafe fn ascii_from( + s: &crate::shared_value::SharedStr, + start: *const Object, +) -> Option> { + let bytes = s.as_bytes(); + if start.is_null() { + return Some(Some((bytes, 0))); + } + // SAFETY: the caller's contract. + let Object::Int(i) = (unsafe { &*start }) else { + return None; + }; + if crate::shared_value::SharedStr::char_count(s) != bytes.len() { + return None; + } + let n = bytes.len() as i64; + let i = if *i < 0 { (*i + n).max(0) } else { *i }; + if i > n { + return Some(None); + } + Some(Some((&bytes[i as usize..], i as usize))) +} + +unsafe extern "C" fn k_str_startswith( + out: *mut Object, + recv: *const Object, + a: *const Object, + b: *const Object, + _: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s. + unsafe { + let Some((s, p)) = two_strs(recv, a) else { + return 1; + }; + let Some(from) = ascii_from(s, b) else { + return 1; + }; + let hit = from.is_some_and(|(t, _)| t.starts_with(p.as_bytes())); + out.write(Object::Bool(hit)); + 0 + } +} + +unsafe extern "C" fn k_str_endswith( + out: *mut Object, + recv: *const Object, + a: *const Object, + b: *const Object, + _: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s. + unsafe { + let Some((s, p)) = two_strs(recv, a) else { + return 1; + }; + let Some(from) = ascii_from(s, b) else { + return 1; + }; + let hit = from.is_some_and(|(t, _)| t.ends_with(p.as_bytes())); + out.write(Object::Bool(hit)); + 0 + } +} + +/// An `isdigit`-style predicate of an ASCII string: true when non-empty +/// and every byte passes `test`. A non-ASCII string declines (unless an +/// earlier ASCII byte already failed). +/// +/// # Safety +/// +/// As [`Kernel`]'s. +unsafe fn ascii_all(out: *mut Object, recv: *const Object, test: fn(u8) -> bool) -> u32 { + // SAFETY: the caller's contract. + unsafe { + let Object::Str(s) = &*recv else { + return 1; + }; + let bytes = s.as_bytes(); + let mut all = !bytes.is_empty(); + for &c in bytes { + if c >= 0x80 { + return 1; + } + if !test(c) { + all = false; + break; + } + } + out.write(Object::Bool(all)); + 0 + } +} + +unsafe extern "C" fn k_str_isdigit( + out: *mut Object, + recv: *const Object, + _: *const Object, + _: *const Object, + _: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s. + unsafe { ascii_all(out, recv, |c| c.is_ascii_digit()) } +} + +unsafe extern "C" fn k_str_isalpha( + out: *mut Object, + recv: *const Object, + _: *const Object, + _: *const Object, + _: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s. + unsafe { ascii_all(out, recv, |c| c.is_ascii_alphabetic()) } +} + +unsafe extern "C" fn k_str_isspace( + out: *mut Object, + recv: *const Object, + _: *const Object, + _: *const Object, + _: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s. + unsafe { ascii_all(out, recv, |c| crate::unicode_case::is_space(char::from(c))) } +} + +unsafe extern "C" fn k_str_find( + out: *mut Object, + recv: *const Object, + a: *const Object, + b: *const Object, + _: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s. + unsafe { + let Some((s, p)) = two_strs(recv, a) else { + return 1; + }; + // (An ASCII receiver's byte offsets are its indices.) + if crate::shared_value::SharedStr::char_count(s) != s.len() { + return 1; + } + let Some(from) = ascii_from(s, b) else { + return 1; + }; + let at = from + .and_then(|(_, i)| crate::builtins::substr_find(&s[i..], p).map(|k| (k + i) as i64)); + out.write(Object::Int(at.unwrap_or(-1))); + 0 + } +} + +/// A method whose body runs no Python code for any arguments on its +/// receiver variant (`str.lower`, the registered pure `str` bodies, +/// `list.reverse`, `dict.items`, `set.pop`, which hands its element's +/// reference over). +unsafe extern "C" fn k_body( + out: *mut Object, + recv: *const Object, + a: *const Object, + b: *const Object, + f: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s. + unsafe { run_body(out, recv, a, b, f) } +} + +/// `lst.insert(i, x)` with an `int` index, whose conversion runs no code. +unsafe extern "C" fn k_list_insert( + out: *mut Object, + recv: *const Object, + a: *const Object, + b: *const Object, + f: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s. + unsafe { + if !matches!(&*a, Object::Int(_) | Object::Bool(_)) { + return 1; + } + run_body(out, recv, a, b, f) + } +} + +/// `"...{}...".format(x, ...)` of arguments that render without Python +/// dispatch (as `leaf_builtin_call` admits them). +unsafe extern "C" fn k_str_format( + out: *mut Object, + recv: *const Object, + a: *const Object, + b: *const Object, + f: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s. + unsafe { + let plain = |v: *const Object| { + v.is_null() + || matches!( + &*v, + Object::Str(_) + | Object::Int(_) + | Object::Bool(_) + | Object::Float(_) + | Object::None + ) + }; + if !(plain(a) && plain(b)) { + return 1; + } + run_body(out, recv, a, b, f) + } +} + +unsafe extern "C" fn k_str_strip( + out: *mut Object, + recv: *const Object, + a: *const Object, + b: *const Object, + f: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s. + unsafe { + if !a.is_null() && !matches!(&*a, Object::Str(_) | Object::None) { + return 1; + } + run_body(out, recv, a, b, f) + } +} + +unsafe extern "C" fn k_str_split( + out: *mut Object, + recv: *const Object, + a: *const Object, + b: *const Object, + f: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s. + unsafe { + if !a.is_null() && !matches!(&*a, Object::Str(_) | Object::None) { + return 1; + } + run_body(out, recv, a, b, f) + } +} + +unsafe extern "C" fn k_str_join( + out: *mut Object, + recv: *const Object, + a: *const Object, + b: *const Object, + f: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s; an exact list's or tuple's exact strings + // join with no iteration hook. + unsafe { + let strs = match &*a { + Object::List(l) => l + .peek() + .is_some_and(|xs| xs.iter().all(|x| matches!(x, Object::Str(_)))), + Object::Tuple(t) => t.iter().all(|x| matches!(x, Object::Str(_))), + _ => false, + }; + if !strs { + return 1; + } + run_body(out, recv, a, b, f) + } +} + +unsafe extern "C" fn k_str_replace( + out: *mut Object, + recv: *const Object, + a: *const Object, + b: *const Object, + f: *const crate::object::BuiltinFn, +) -> u32 { + // SAFETY: as `Kernel`'s. + unsafe { + if !matches!((&*a, &*b), (Object::Str(_), Object::Str(_))) { + return 1; + } + run_body(out, recv, a, b, f) + } +} + +/// [`h_container`]'s raise: the error in `st`, `st.len` and `st.pc` past +/// the instruction. +const CONTAINER_RAISED: u64 = u64::MAX - 1; + +/// A container instruction (`BINARY_SUBSCR`, `BINARY_SLICE`, `STORE_SUBSCR`, +/// `LIST_APPEND`, `UNPACK_SEQUENCE`, `UNPACK_EX`, `LOAD_SUPER_ATTR`, and an +/// `except` clause's entry, test and exit; the one at `ins`, the `pc`th of +/// `code`) on the top of a `len`-deep stack, as the core loop's arm runs +/// it: the new depth, [`CONTAINER_RAISED`] (only when `can_raise`: the +/// whole stack is on the frame's), or `u64::MAX` declined untouched. +unsafe extern "C" fn h_container( + st: *mut State, + ins: *const weavepy_compiler::Instruction, + code: *const CodeObject, + pc: u64, + len: u64, + can_raise: u64, +) -> u64 { + // SAFETY: the code passes its live state, one of its own instructions + // and its code, and its stack depth. + unsafe { + let st = &mut *st; + let (ins, len) = (*ins, len as usize); + if ins.op == OpCode::LoadSuperAttr { + return Interpreter::core_super_attr(&*code, ins, pc as usize, st.stack, len) + .map_or(u64::MAX, |n| n as u64); + } + if ins.op == OpCode::LoadSpecial { + return Interpreter::core_load_special(&*code, ins, pc as usize, st.stack, len, st.cap) + .map_or(u64::MAX, |n| n as u64); + } + if matches!( + ins.op, OpCode::PushExcInfo | OpCode::CheckExcMatch | OpCode::PopExcept ) { let interp = &mut *st.interp.cast_mut(); return interp - .core_exc_op(&mut (*st.frame).exc, ins, st.stack, len, st.cap) + .core_exc_op(ins, st.stack, len, st.cap) .map_or(u64::MAX, |n| n as u64); } if let Some(n) = Interpreter::core_container_op(ins, st.stack, len, st.cap) { @@ -1341,6 +2550,385 @@ unsafe extern "C" fn h_contains(at: *mut Object) -> u32 { } } +/// `CONTAINS_OP` of the item at `item` in the container at `cont`, each +/// read in place: a local's or constant's (borrowed), or a stack slot's +/// (owned there, its bit in `owned`: `1` the item, `2` the container), +/// which leaves the stack. `0` or `1` (found), anything else declined +/// untouched. +unsafe fn contains_fast(item: *const Object, cont: *const Object, owned: u32) -> u32 { + // SAFETY: the code passes two initialized values, the owned ones in + // stack slots. + unsafe { + let (i, c) = (&*item, &*cont); + if owned != 0 && !(droppable(i) && droppable(c)) { + return 2; + } + let Some(found) = + Interpreter::leaf_contains_table(c, i).or_else(|| Interpreter::leaf_contains(c, i)) + else { + return 2; + }; + if owned & 2 != 0 { + crate::drop_hot(cont.read()); + } + if owned & 1 != 0 { + crate::drop_hot(item.read()); + } + u32::from(found) + } +} + +/// `BINARY_SUBSCR` of the container at `cont` by the key at `key`, each +/// read in place as [`contains_fast`] reads its operands (`owned`: `1` +/// the container, `2` the key): an exact `dict` by a key that compares +/// natively, a `list` or `tuple` by an in-range `int`, or a `str` by an +/// in-range `int` (an ASCII one's). `0` the item written to `out` (the +/// owned operands released first), anything else declined untouched. +unsafe fn subscr_fast( + out: *mut Object, + cont: *const Object, + key: *const Object, + owned: u32, +) -> u32 { + // SAFETY: the code passes two initialized values, the owned ones in + // stack slots, and a free slot (or the container's own) for the item. + unsafe { + let (c, k) = (&*cont, &*key); + if owned != 0 && !(droppable(c) && droppable(k)) { + return 1; + } + let index = |n: usize| -> Option { + let Object::Int(i) = *k else { + return None; + }; + let i = if i < 0 { i.checked_add(n as i64)? } else { i }; + usize::try_from(i).ok().filter(|&i| i < n) + }; + let r = match c { + Object::Dict(d) => { + let Some(probe) = crate::object::LeafProbe::new(k) else { + return 1; + }; + let Some(v) = d.peek().and_then(|m| m.get_hot(&probe)) else { + return 1; + }; + crate::clone_hot(v) + } + Object::List(xs) => { + let Some(xs) = xs.peek() else { + return 1; + }; + let Some(i) = index(xs.len()) else { + return 1; + }; + crate::clone_hot(&xs[i]) + } + Object::Tuple(t) => { + let Some(i) = index(t.len()) else { + return 1; + }; + crate::clone_hot(&t[i]) + } + Object::Str(s) => { + let bytes = s.as_bytes(); + if crate::shared_value::SharedStr::char_count(s) != bytes.len() { + return 1; + } + let Some(i) = index(bytes.len()) else { + return 1; + }; + Object::from_char(char::from(bytes[i])) + } + _ => return 1, + }; + if owned & 2 != 0 { + crate::drop_hot(key.read()); + } + if owned & 1 != 0 { + crate::drop_hot(cont.read()); + } + out.write(r); + 0 + } +} + +/// `UNPACK_SEQUENCE n` of the exact `n`-item tuple or list at `src`, read +/// in place (a local's or constant's), or owned in the stack slot `dst` +/// itself (`owned`), which leaves the stack: its items to `dst` and up, +/// the last item first, as the core loop's arm pushes them. `0` unpacked, +/// anything else declined untouched. +unsafe fn unpack_fast( + dst: *mut Object, + src: *const Object, + n: u64, + owned: u32, + interp: &Interpreter, +) -> u32 { + // SAFETY: the code passes an initialized value (in `dst` itself when + // owned) and `n` free slots from `dst` up (the first the owned + // value's). + unsafe { + let n = n as usize; + let s = &*src; + let fits = match s { + Object::Tuple(t) => t.len() == n, + Object::List(l) => l.peek().is_some_and(|xs| xs.len() == n), + _ => false, + }; + // An owned sequence's release frees nothing that could finalize + // when this is its only reference (its items outlive it on the + // stack); a shared one's is a plain decrement. + let unique = match s { + Object::Tuple(t) => crate::shared_value::ThinArc::strong_count(t) == 1, + Object::List(l) => Rc::strong_count(l) == 1, + _ => false, + }; + if !fits || (owned != 0 && !unique && !droppable(s)) { + return 1; + } + let seq = if owned != 0 { Some(src.read()) } else { None }; + let s = seq.as_ref().unwrap_or(s); + match s { + Object::Tuple(t) => { + for (k, item) in t.iter().rev().enumerate() { + dst.add(k).write(crate::clone_hot(item)); + } + } + Object::List(l) => { + let xs = l.peek().expect("checked above"); + for (k, item) in xs.iter().rev().enumerate() { + dst.add(k).write(crate::clone_hot(item)); + } + } + _ => unreachable!("checked above"), + } + // (A dead tuple's allocation is recycled, as `release` does it.) + match seq { + Some(seq @ Object::Tuple(_)) => interp.maybe_donate_tuple(seq), + Some(seq) => crate::drop_hot(seq), + None => {} + } + 0 + } +} + +/// `STORE_SUBSCR` of the value at `val` into the container at `cont` by +/// the key at `key`, each read in place as [`contains_fast`] reads its +/// operands (`owned`: `1` the value, `2` the container, `4` the key): an +/// exact `list` by an in-range `int`, or an exact `dict` by a key that +/// compares natively, as the core loop's arm stores. `0` stored (an owned +/// value moved in, a borrowed one copied; the other owned operands and +/// the displaced value released), anything else declined untouched. +unsafe fn store_subscr_fast( + val: *const Object, + cont: *const Object, + key: *const Object, + owned: u32, +) -> u32 { + // SAFETY: the code passes three initialized values, the owned ones in + // stack slots. The store runs no code; a displaced value is released + // after it (a finalizer it queues runs before the next instruction). + unsafe { + let (c, k) = (&*cont, &*key); + if !Interpreter::core_droppable(c) || (owned & 4 != 0 && !droppable(k)) { + return 1; + } + let displaced_ok = |old: &Object| { + matches!( + old, + Object::Int(_) | Object::Float(_) | Object::Bool(_) | Object::None + ) || Interpreter::core_droppable(old) + }; + let value = || { + if owned & 1 != 0 { + val.read() + } else { + crate::clone_hot(&*val) + } + }; + let old = match (c, k) { + (Object::List(xs), Object::Int(i)) => { + let Some(xs) = xs.peek_mut() else { + return 1; + }; + let n = xs.len() as i64; + let i = if *i < 0 { *i + n } else { *i }; + if i < 0 || i >= n || !displaced_ok(&xs[i as usize]) { + return 1; + } + std::mem::replace(&mut xs[i as usize], value()) + } + (Object::Dict(cell), Object::Str(_) | Object::Int(_) | Object::Tuple(_)) => { + if crate::capi_watchers::dicts_active() { + return 1; + } + let Some(probe) = crate::object::LeafProbe::new(k) else { + return 1; + }; + let Some(d) = cell.peek_mut() else { + return 1; + }; + // One probe finds the entry or the slot a new key takes. + let (old, changed) = match d.probe_entry(&probe) { + crate::dictmap::ProbeEntry::Occupied(e) => { + let slot = e.into_mut(); + if !displaced_ok(slot) { + return 1; + } + let old = std::mem::replace(slot, value()); + let changed = !old.is_same(slot); + (old, changed) + } + crate::dictmap::ProbeEntry::Vacant(e) => { + if !probe.miss_is_exact() { + return 1; + } + e.insert(crate::object::DictKey(crate::clone_hot(k)), value()); + (Object::None, true) + } + }; + if changed { + crate::object::dict_mutation_event(cell); + } + old + } + _ => return 1, + }; + if owned & 4 != 0 { + crate::drop_hot(key.read()); + } + if owned & 2 != 0 { + crate::drop_hot(cont.read()); + } + crate::drop_hot(old); + 0 + } +} + +/// Copy the borrowed operands among `ops` (bit `k` of `owned` clear) to +/// the free stack slots `at.add(k)`, so that all of them are on the +/// stack, as the container helpers take them. +/// +/// # Safety +/// +/// Each pointer addresses an initialized value; the slots of the +/// borrowed ones are free. +unsafe fn own_operands(at: *mut Object, ops: &[*const Object], owned: u32) { + for (k, &p) in ops.iter().enumerate() { + if owned & (1 << k) == 0 { + // SAFETY: the caller's contract. + unsafe { at.add(k).write(crate::clone_hot(&*p)) }; + } + } +} + +/// `CONTAINS_OP` of a local's, constant's or stack slot's item and +/// container (bit `k` of `owned`: the one owned in the slot `at.add(k)`), +/// read in place where they lie (see [`contains_fast`]); any other shape +/// with both operands copied to the stack and through [`h_contains`], +/// whose result it is. +unsafe extern "C" fn h_contains_ref( + item: *const Object, + cont: *const Object, + owned: u32, + at: *mut Object, +) -> u32 { + // SAFETY: the code passes the operands, and the two slots from `at` + // (the owned operands' own). + unsafe { + let r = contains_fast(item, cont, owned); + if r <= 1 { + return r; + } + own_operands(at, &[item, cont], owned); + h_contains(at) + } +} + +/// `BINARY_SUBSCR` (the `pc`th instruction `ins` of `code`) on a stack +/// `len` deep whose top two slots are the container's and key's (each +/// owned there, by the bits of `flags`, or a local's or constant's at +/// `cont` / `key`): through [`subscr_fast`], else with both operands on +/// the stack through [`h_container`] (`flags` bit 8: it may raise), whose +/// result it is. +#[allow(clippy::too_many_arguments)] +unsafe extern "C" fn h_subscr_ref( + st: *mut State, + ins: *const weavepy_compiler::Instruction, + code: *const CodeObject, + pc: u64, + len: u64, + cont: *const Object, + key: *const Object, + flags: u64, +) -> u64 { + // SAFETY: the code passes its live state, one of its own instructions + // and its code, its depth, and the operands. + unsafe { + let at = (*st).stack.add(len as usize - 2); + let owned = (flags & 0xff) as u32; + if subscr_fast(at, cont, key, owned) == 0 { + return len - 1; + } + own_operands(at, &[cont, key], owned); + h_container(st, ins, code, pc, len, flags >> 8) + } +} + +/// `UNPACK_SEQUENCE n` as [`h_subscr_ref`] runs a subscript: through +/// [`unpack_fast`] on the sequence in the top slot or at `src`, else on +/// the stack through [`h_container`]. +#[allow(clippy::too_many_arguments)] +unsafe extern "C" fn h_unpack_ref( + st: *mut State, + ins: *const weavepy_compiler::Instruction, + code: *const CodeObject, + pc: u64, + len: u64, + src: *const Object, + n: u64, + flags: u64, +) -> u64 { + // SAFETY: as `h_subscr_ref`'s. + unsafe { + let at = (*st).stack.add(len as usize - 1); + let owned = (flags & 0xff) as u32; + if unpack_fast(at, src, n, owned, &*(*st).interp) == 0 { + return len - 1 + n; + } + own_operands(at, &[src], owned); + h_container(st, ins, code, pc, len, flags >> 8) + } +} + +/// `STORE_SUBSCR` as [`h_subscr_ref`] runs a subscript: through +/// [`store_subscr_fast`] on the value, container and key in the top +/// three slots or at `val`, `cont`, `key`, else on the stack through +/// [`h_container`]. +#[allow(clippy::too_many_arguments)] +unsafe extern "C" fn h_store_subscr_ref( + st: *mut State, + ins: *const weavepy_compiler::Instruction, + code: *const CodeObject, + pc: u64, + len: u64, + val: *const Object, + cont: *const Object, + key: *const Object, + flags: u64, +) -> u64 { + // SAFETY: as `h_subscr_ref`'s. + unsafe { + let at = (*st).stack.add(len as usize - 3); + let owned = (flags & 0xff) as u32; + if store_subscr_fast(val, cont, key, owned) == 0 { + return len - 3; + } + own_operands(at, &[val, cont, key], owned); + h_container(st, ins, code, pc, len, flags >> 8) + } +} + /// `BINARY_OP` of `kind` over the values at `at` and above it, for the /// shapes the core loop's arm runs (two numbers; strings' concatenation, /// repetition and `%` formatting; two tuples' or lists' concatenation; a @@ -1592,7 +3180,7 @@ unsafe extern "C" fn h_local_method( let st = &mut *st; let (code, ext, pc) = (&*code, &*ext, pc as usize); let local = &*st.locals.add(code.instructions[pc].arg as usize); - let Some((r, call_pc)) = (*st.interp).core_local_method( + let Some((r, call_pc)) = (*st.interp).core_local_method::( code, Some(ext), local, @@ -1686,7 +3274,7 @@ unsafe extern "C" fn h_load_global( if frame.builtins_obj().is_some() { return DECLINED; } - let Some(slot) = ext.stamp_slots.get().and_then(|s| s.get(pc)) else { + let Some(slot) = ext.stamp_slot(pc) else { return DECLINED; }; let (gdict, bdict) = (frame.globals.as_ptr(), frame.builtins.as_ptr()); @@ -1781,9 +3369,7 @@ unsafe extern "C" fn h_load_global( && crate::simple_args_prefix(ins, pc + 2) => { let fp = ext - .method_slots - .get() - .and_then(|s| s.get(pc + 1)) + .method_slot(pc + 1) .and_then(|ms| ms.peek_unbound(cls.attr_version.get())) .filter(|&fp| crate::fn_is_pure_leaf(&*fp)); if let Some(fp) = fp { @@ -1804,35 +3390,34 @@ unsafe extern "C" fn h_load_global( // the `LOAD_ATTR` site's stamp. Object::Type(cls) if op_at(pc + 1) == Some(OpCode::LoadAttr) => { if let Some(c) = ext - .stamp_slots - .get() - .and_then(|s| s.get(pc + 1)) + .stamp_slot(pc + 1) .and_then(|s| crate::class_attr_hit(s, cls)) { return fused(st, c, pc + 1); } } - // A value no fused shape takes: the native code reads it in - // line while the dicts' stamps hold (a stamp changes with every - // mutation, so the value stays where it is). - _ => { - let c = &mut *cache; - // (A namespace handle's bits: one pointer-sized word.) - c.value = 0; - c.globals = std::ptr::addr_of!((*st.frame).globals).cast::().read(); - c.gstamp = g_stamp; - c.gdata = gdict as u64; - (c.builtins, c.bstamp, c.bdata) = if builtin { - let b = std::ptr::addr_of!((*st.frame).builtins) - .cast::() - .read(); - (b, b_stamp, bdict as u64) - } else { - (0, 0, 0) - }; - c.value = std::ptr::from_ref(v) as u64; - } + _ => {} } + // The value itself: the native code reads it in line while the + // dicts' stamps hold (a stamp changes with every mutation, so the + // value stays where it is). A fused shape that declined fills the + // cache too: the next read tries the shape again only through a + // miss. + let c = &mut *cache; + // (A namespace handle's bits: one pointer-sized word.) + c.value = 0; + c.globals = std::ptr::addr_of!((*st.frame).globals).cast::().read(); + c.gstamp = g_stamp; + c.gdata = gdict as u64; + (c.builtins, c.bstamp, c.bdata) = if builtin { + let b = std::ptr::addr_of!((*st.frame).builtins) + .cast::() + .read(); + (b, b_stamp, bdict as u64) + } else { + (0, 0, 0) + }; + c.value = std::ptr::from_ref(v) as u64; dst.write(crate::clone_hot(v)); PUSHED } @@ -1884,6 +3469,8 @@ unsafe extern "C" fn h_load_method( ext: *const CodeConstObjects, pc: u64, len: u64, + cache: *mut MethodCache, + mcache: *const ModCache, ) -> u32 { // SAFETY: the code passes its live state, its own code and extension, // one of its method loads, and its stack depth (at least one, with @@ -1905,14 +3492,58 @@ unsafe extern "C" fn h_load_method( // `module.func(...)`: the attribute with an empty self slot, as the // core loop's arm loads it. if let Object::Module(m) = &*top { - let Some(v) = Interpreter::core_module_attr(code, m, pc, name) else { - return 1; + // The entry the site last read, while the module's dict is + // exactly as it was then (its stamp moves with every change). + let mc = &*mcache; + let hit = m.dict.peek().and_then(|d| { + (std::ptr::eq(Rc::as_ptr(&m.dict).cast::(), mc.dict.get() as *const u8) + && d.mutation_stamp() == mc.stamp.get()) + .then(|| d.get_index(mc.idx.get()).map(|(_, v)| crate::clone_hot(v))) + .flatten() + }); + let v = match hit { + Some(v) => v, + None => { + let Some(v) = Interpreter::core_module_attr(code, m, pc, name) else { + return 1; + }; + mc.note(code, m, pc); + v + } }; crate::drop_hot(std::mem::replace(&mut *top, v)); st.stack.add(len).write(Object::Unbound); return 0; } - let Some(ms) = ext.method_slots.get().and_then(|s| s.get(pc)) else { + // A receiver class the site saw before: its cached function, while + // the instance holds no dictionary and no value at or past the + // name's position (see `Lower::load_method`). + if let (Object::Instance(inst), false) = (&*top, cache.is_null()) { + let ver = inst.cls_raw().attr_version.get(); + if let Some(e) = (*cache).poly.iter().find(|e| e.ver == ver) { + let shadow_free = inst.dict.published().is_none() + && match inst.dict.split_peek() { + Some(split) => { + let (keys, n) = split.keys_and_len(); + n == 0 || (keys as u64 == e.keys && n <= e.before as usize) + } + None => false, + }; + if shadow_free { + // The function's own bits: its class holds it while the + // version stands, so a clone takes a count of it. + let f = std::mem::ManuallyDrop::new( + std::ptr::from_ref(&e.obj).cast::().read(), + ); + let f = crate::clone_hot(&f); + let recv = top.read(); + top.write(f); + st.stack.add(len).write(recv); + return 0; + } + } + } + let Some(ms) = ext.method_slot(pc) else { return 1; }; let f = match &*top { @@ -1925,10 +3556,15 @@ unsafe extern "C" fn h_load_method( // An attribute the instance holds itself (a stored callable): // the value with an empty self slot, as the core loop's arm. if crate::inst_may_shadow(inst, code, name) { - return u32::from(!Interpreter::core_value_method(code, name, top)); + return u32::from(!Interpreter::core_value_method(code, name, pc, top)); } let f = match ms.get_held(ver) { - Some(f) => Object::Function(f), + Some(f) => { + if !cache.is_null() { + fill_method_cache(&mut *cache, cls, ver, &f, ext, name); + } + Object::Function(f) + } None => match ms.get_inst_builtin(ver) { Some(b) => Object::Builtin(b), None => match ext.name_objs.get(name as usize).and_then(|n| match n { @@ -1979,13 +3615,160 @@ unsafe extern "C" fn h_load_method( } } +/// A method-load site's in-line cache (see `Lower::load_method`): the +/// class version (`0` empty) whose plain function `func` (its payload +/// word) the site loaded, and what proves an instance doesn't shadow it: +/// the class's shared names `keys` (`0` none) and the name's position +/// among them (an instance holding fewer values can't hold the name). +#[repr(C)] +#[derive(Default)] +pub(crate) struct MethodCache { + ver: u64, + func: u64, + keys: u64, + before: u32, + /// The function `Object`'s first word (its tag), `func` its second. + head: u64, + /// The site's other receiver classes (a polymorphic call), checked by + /// the helper before its general path, most recent first. + poly: [MethodEntry; 3], +} + +/// One of a [`MethodCache`]'s polymorphic entries. +#[derive(Default, Clone, Copy)] +struct MethodEntry { + ver: u64, + /// The function `Object`'s two words. + obj: [u64; 2], + keys: u64, + before: u32, +} + +const MC_VER: i32 = std::mem::offset_of!(MethodCache, ver) as i32; +const MC_FUNC: i32 = std::mem::offset_of!(MethodCache, func) as i32; +const MC_KEYS: i32 = std::mem::offset_of!(MethodCache, keys) as i32; +const MC_BEFORE: i32 = std::mem::offset_of!(MethodCache, before) as i32; + +/// Record in `cache` that instances of `cls` at version `ver` load the +/// plain function `f` for the name `co_names[name]` (the caller proved +/// this instance doesn't shadow it, and that `cls` keeps the default +/// `__getattribute__`). +fn fill_method_cache( + cache: &mut MethodCache, + cls: &crate::types::TypeObject, + ver: u64, + f: &Rc, + ext: &CodeConstObjects, + name: u32, +) { + let (keys, before) = match cls.shared_keys.get() { + Some(keys) => { + let (Some(Object::Str(n)), Some(&hash)) = ( + ext.name_objs.get(name as usize), + ext.name_hashes.get(name as usize), + ) else { + return; + }; + ( + std::ptr::from_ref(keys) as u64, + u32::try_from(keys.names_before(n, hash)).unwrap_or(u32::MAX), + ) + } + None => (0, 0), + }; + let obj = Object::Function(f.clone()); + // SAFETY: an `Object` is 16 bytes; its second word is the payload. + let [head, word] = unsafe { std::ptr::from_ref(&obj).cast::<[u64; 2]>().read() }; + drop(obj); + // The entry it replaces moves down the polymorphic list. + if cache.ver != 0 && cache.ver != ver { + cache.poly.copy_within(0..2, 1); + cache.poly[0] = MethodEntry { + ver: cache.ver, + obj: [cache.head, cache.func], + keys: cache.keys, + before: cache.before, + }; + } + cache.ver = ver; + cache.head = head; + cache.func = word; + cache.keys = keys; + cache.before = before; +} + +/// A method load's module-attribute shortcut: the module dict's address +/// and stamp when the site last read it, and the entry's position (`0` +/// address: empty). +#[derive(Default)] +pub(crate) struct ModCache { + dict: std::cell::Cell, + stamp: std::cell::Cell, + idx: std::cell::Cell, +} + +impl ModCache { + /// Remember the entry the site's inline cache just read from `m`. + #[cold] + fn note(&self, code: &CodeObject, m: &crate::object::PyModule, pc: usize) { + use weavepy_compiler::InlineCache as IC; + let IC::LoadAttrModule { key_idx, .. } = code.caches.get(pc as u32) else { + return; + }; + // SAFETY: a read between two instructions. + if let Some(d) = unsafe { m.dict.peek() } { + self.dict.set(Rc::as_ptr(&m.dict).cast::() as usize); + self.stamp.set(d.mutation_stamp()); + self.idx.set(key_idx as usize); + } + } +} + /// A `LOAD_ATTR` site's `__slots__` member shortcut: the class version and /// the member's position the site's cache last proved (`ver` 0 empty), /// read without decoding the site's cache. +/// +/// A module receiver's read keeps its own pair: the module dict's stamp +/// when the site last read it (`0` empty: no dict has that stamp) and +/// the address of the entry's value, which compiled code reads in line +/// while the stamp stands (as [`GlobalCache`] does a global's). #[derive(Default)] +#[repr(C)] pub(crate) struct SlotCache { ver: std::cell::Cell, idx: std::cell::Cell, + mstamp: std::cell::Cell, + mvalue: std::cell::Cell, +} + +const SC_MSTAMP: i32 = std::mem::offset_of!(SlotCache, mstamp) as i32; +const SC_MVALUE: i32 = std::mem::offset_of!(SlotCache, mvalue) as i32; + +/// Remember in the `LOAD_ATTR` site's `cache` the entry of `m`'s dict the +/// site's stamp (see `MODULE_ENTRY`) just proved, for compiled code's +/// in-line read. +fn mod_attr_note( + ext: &CodeConstObjects, + m: &crate::object::PyModule, + pc: usize, + cache: &SlotCache, +) { + let Some(slot) = ext.stamp_slot(pc) else { + return; + }; + let [stamp, tag, idx] = slot.get(); + if tag != crate::MODULE_ENTRY { + return; + } + // SAFETY: a read between two instructions, running no code. + if let Some(d) = unsafe { m.dict.peek() } { + if d.mutation_stamp() == stamp { + if let Some((_, v)) = d.get_index(idx as usize) { + cache.mstamp.set(stamp); + cache.mvalue.set(std::ptr::from_ref(v) as u64); + } + } + } } /// The `__slots__` member `recv` holds for the `LOAD_ATTR` at `pc`, through @@ -2010,8 +3793,10 @@ unsafe fn slot_hit( if ver == 0 || inst.cls_raw().attr_version.get() != ver { return None; } - let slots = inst.slots.try_borrow().ok()?; - let (k, v) = slots.get_index(cache.idx.get() as usize)?; + // SAFETY: a read between two instructions, running no code (see + // `GilCell::peek`); the view ends with the value's clone. + let slots = unsafe { inst.slots.peek() }?; + let (k, v) = slots.get_index_hot(cache.idx.get() as usize)?; crate::slot_name_matches(code, code.instructions[pc].arg, k) .then(|| Interpreter::clone_operand(v)) } @@ -2029,6 +3814,11 @@ fn slot_note(code: &CodeObject, recv: &Object, pc: usize, cache: *const SlotCach let cache = unsafe { &*cache }; cache.ver.set(ver); cache.idx.set(key_idx); + // (The compiled read takes a laid-out member in line.) + if let Some(ext) = crate::code_vm_ext_existing(code) { + let name = code.instructions[pc].arg; + crate::slot_field_note(code, ext, pc, inst, key_idx, name); + } } } } @@ -2059,6 +3849,9 @@ unsafe extern "C" fn h_stack_attr( crate::drop_hot(std::mem::replace(&mut *at, v)); return 0; } + if matches!(recv, Object::Instance(_)) && crate::failing_attr_site(code, pc) { + return 1; + } let arg = code.instructions[pc].arg; let v = match recv { Object::Instance(inst) if inst.cls_raw().native_kind.get() != 0 => { @@ -2072,13 +3865,7 @@ unsafe extern "C" fn h_stack_attr( IC::LoadAttrInstance { key_idx, ver } if cls.attr_version.get() == ver => { match inst.attr_peek_index(key_idx as usize) { Some((k, v)) if crate::slot_name_matches(code, arg, k) => { - crate::field_slot_note( - ext, - code.instructions.len(), - pc, - inst, - key_idx, - ); + crate::field_slot_note(ext, code, pc, inst, key_idx); Some(Interpreter::clone_operand(v)) } _ => None, @@ -2090,8 +3877,31 @@ unsafe extern "C" fn h_stack_attr( } }, Object::Type(cls) if Rc::strong_count(cls) > 1 => type_attr(code, ext, cls, pc, arg), - Object::Module(m) => Interpreter::core_module_attr(code, m, pc, arg) - .or_else(|| Interpreter::leaf_fused_local_attr(code, recv, pc, arg)), + Object::Module(m) => { + let Some(v) = Interpreter::core_module_attr(code, m, pc, arg) + .or_else(|| Interpreter::leaf_fused_local_attr(code, recv, pc, arg)) + else { + return 1; + }; + mod_attr_note(ext, m, pc, &*cache); + crate::drop_hot(std::mem::replace(&mut *at, v)); + return 0; + } + Object::Code(_) | Object::Frame(_) => { + let Some(v) = code + .names + .get(arg as usize) + .and_then(|name| Interpreter::frame_plain_attr(recv, name, None)) + else { + return 1; + }; + crate::drop_hot(std::mem::replace(&mut *at, v)); + return 0; + } + // A function's stored attribute (`wrapper.calls`). + Object::Function(_) => { + return u32::from(!Interpreter::core_function_load(code, arg, at)) + } _ => None, }; let Some(v) = v else { @@ -2116,9 +3926,7 @@ fn type_attr( arg: u32, ) -> Option { if let Some(v) = ext - .stamp_slots - .get() - .and_then(|s| s.get(pc)) + .stamp_slot(pc) .and_then(|s| crate::class_attr_hit(s, cls)) { return Some(v); @@ -2153,15 +3961,42 @@ unsafe extern "C" fn h_local_attr( dst.write(v); return 0; } + if matches!(recv, Object::Instance(_)) && crate::failing_attr_site(code, pc) { + return 1; + } let arg = code.instructions[pc].arg; let v = match recv { Object::Instance(inst) if inst.cls_raw().native_kind.get() != 0 => { Interpreter::core_native_field(Some(ext), inst, arg, pc, code.instructions.len()) } - Object::Instance(_) | Object::Module(_) => { - Interpreter::core_local_attr(Some(ext), code, recv, pc, arg) + Object::Module(m) => { + let Some(v) = Interpreter::core_module_attr(code, m, pc, arg) + .or_else(|| Interpreter::core_local_attr(Some(ext), code, recv, pc, arg)) + else { + return 1; + }; + mod_attr_note(ext, m, pc, &*cache); + dst.write(v); + return 0; } + Object::Instance(_) => Interpreter::core_local_attr(Some(ext), code, recv, pc, arg), Object::Type(cls) => type_attr(code, ext, cls, pc, arg), + Object::Function(f) => Interpreter::leaf_function_read(code, f, arg), + // A frame's or code object's plain field (a live frame's line + // needs the full lane, which makes its `lasti` current). + Object::Code(_) | Object::Frame(_) => { + return match code + .names + .get(arg as usize) + .and_then(|name| Interpreter::frame_plain_attr(recv, name, None)) + { + Some(v) => { + dst.write(v); + 0 + } + None => 1, + }; + } _ => None, }; match v { @@ -2185,8 +4020,19 @@ unsafe extern "C" fn h_stack_store_attr(code: *const CodeObject, pc: u64, at: *m unsafe { let (code, pc) = (&*code, pc as usize); let (val, recv) = (&*at, &*at.add(1)); - let Object::Instance(inst) = recv else { - return 1; + let inst = match recv { + Object::Instance(inst) => inst, + // A function's attribute (`wrapper.calls += 1`): both leave. + Object::Function(_) => { + let arg = code.instructions[pc].arg; + return u32::from(!Interpreter::core_function_store(code, arg, at.add(1))); + } + // A plain class's own attribute (`Cls.count = n`). + Object::Type(_) => { + let arg = code.instructions[pc].arg; + return u32::from(!Interpreter::core_class_store(code, arg, at.add(1))); + } + _ => return 1, }; if !droppable(recv) || !Interpreter::core_store_attr(code, inst, pc, code.instructions[pc].arg, val) @@ -2286,6 +4132,34 @@ const DIRECT_CALL_DEPTH: u32 = 48; /// `st` is the caller's live state, its switch non-null, and the running /// activation the callee its `CALL` just pushed. unsafe fn run_callee_directly(st: &mut State, start: usize) -> bool { + // SAFETY: the caller's contract. + unsafe { run_switched_directly(st) && (*st.frame).stack.len() == start + 1 } +} + +/// The pc a `FOR_ITER` at `pc` of `code` goes on at once its iterator is +/// exhausted and gone: past the loop's `END_FOR` / `POP_ITER` pair. +fn for_iter_exit(code: &CodeObject, pc: usize) -> usize { + let mut to = pc + 1 + code.instructions[pc].arg as usize; + let op = |pc: usize| code.instructions.get(pc).map(|i| i.op); + if op(to) == Some(OpCode::EndFor) { + to += 1; + if matches!(op(to), Some(OpCode::PopIter | OpCode::PopTop)) { + to += 1; + } + } + to +} + +/// [`run_callee_directly`] for any activation just switched to (a call's +/// callee, a resumed generator): `true` when its native code ran it until +/// it switched back to this code's activation with nothing pending (the +/// frame synced: the caller checks where it was left), `false` when the +/// core loop goes on (with whatever the run left synced). +/// +/// # Safety +/// +/// As [`run_callee_directly`]'s. +unsafe fn run_switched_directly(st: &mut State) -> bool { // SAFETY: the caller's contract. unsafe { let sw = &mut *st.sw; @@ -2328,17 +4202,16 @@ unsafe fn run_callee_directly(st: &mut State, start: usize) -> bool { frame: sw.cur, sw: st.sw, gen_depth: 0, + direct: false, }; interp.direct_calls.set(nested + 1); let status = native.run(&mut cst); interp.direct_calls.set(nested); let sw = &mut *st.sw; if status == RELOAD { - // Returned into the caller, nothing pending: done. Otherwise - // whoever switched last synced what runs next. - return sw.pending.is_none() - && std::ptr::eq(sw.cur, st.frame) - && (*st.frame).stack.len() == start + 1; + // Back in the caller, nothing pending: done. Otherwise whoever + // switched last synced what runs next. + return sw.pending.is_none() && std::ptr::eq(sw.cur, st.frame); } // The callee stopped partway: its state, synced as the core loop // syncs it after a native run, for the core loop to go on with. @@ -2355,6 +4228,40 @@ unsafe fn run_callee_directly(st: &mut State, start: usize) -> bool { } } +/// The end of `h_call`'s generator-function call at `pc` (its operands +/// from `start`), made by `Interpreter::core_gen_call`: the generator in +/// place (`0`), or an `await` whose coroutine that call started (the +/// switch in the state), run from here as [`h_send`] runs a resumed +/// delegate: `AWAITED` when it returned into the await's `END_SEND` +/// (`[coroutine, result]` from `start`), else `RELOAD`. +/// +/// # Safety +/// +/// `st` is a live state whose switch is non-null. +unsafe fn gen_call_done(st: &mut State, pc: usize, start: usize) -> u32 { + // SAFETY: the caller's contract. + unsafe { + let sw = &*st.sw; + if !std::ptr::eq(sw.cur, st.frame) { + if sw.pending.is_none() && run_switched_directly(st) { + let frame = &*st.frame; + let send_pc = pc + 3; + let exit = send_pc + 1 + frame.code.instructions[send_pc].arg as usize; + if frame.pc as usize == exit && frame.stack.len() == start + 2 { + st.len = start + 2; + return AWAITED; + } + } + return RELOAD; + } + if finished_in_place(st, start) { + 0 + } else { + RELOAD + } + } +} + /// Whether the call whose operands started at `start` finished in place /// (a frameless `__init__`, a builtin's lane): nothing pending, the same /// activation running, its result alone in their place. Then the native @@ -2390,17 +4297,64 @@ pub(crate) struct DirectSite { code: usize, native: usize, retry: u32, + /// How many trailing parameters take the function's defaults. + missing: u32, has_self: bool, + /// A second callee the site calls directly (a polymorphic method + /// call's other receiver class): its code (a counted reference, `0` + /// none), body, defaults taken and self slot. + alt_code: usize, + alt_native: usize, + alt_missing: u32, + alt_has_self: bool, + /// The hit keys: each callee's code address with the self slot in its + /// low bit, `0` while it has no body (one compare per lookup). + key: usize, + alt_key: usize, + /// A frameless leaf callee the site evaluates in place (see + /// [`leaf_site_call`]): its code (a counted reference, `0` none), key, + /// and defaults taken; and the one before it (a polymorphic method + /// call's other receiver class). + leaf_code: usize, + leaf_key: usize, + leaf_missing: u32, + alt_leaf_missing: u32, + alt_leaf_code: usize, + alt_leaf_key: usize, + /// Nonzero while the site has a body or a leaf to take: the native + /// code tries the direct helper first then. + hot: usize, + /// The activation slot the site's last clean direct return parked + /// here (see `Interpreter::inline_park_warm`), still holding its + /// callee's code: the next call of that code binds it without taking + /// a slot from the pool or a reference to the code. + act: Option>, } -const DS_NATIVE: i32 = std::mem::offset_of!(DirectSite, native) as i32; +/// A [`DirectSite`] key: `code`'s address, with `has_self` in its low bit +/// (code objects are word-aligned). +#[inline(always)] +fn site_key(code: usize, has_self: bool) -> usize { + code | usize::from(has_self) +} + +const DS_HOT: i32 = std::mem::offset_of!(DirectSite, hot) as i32; const DS_RETRY: i32 = std::mem::offset_of!(DirectSite, retry) as i32; impl Drop for DirectSite { fn drop(&mut self) { - if self.code != 0 { - // SAFETY: `code` holds the count `fill` took. - unsafe { drop(Rc::from_raw(self.code as *const CodeObject)) }; + for code in [self.code, self.alt_code, self.leaf_code, self.alt_leaf_code] { + if code != 0 { + // SAFETY: each holds the count a fill took. + unsafe { drop(Rc::from_raw(code as *const CodeObject)) }; + } + } + if let Some(act) = self.act.take() { + // SAFETY: a warm slot holds its code's count (see + // `Interpreter::inline_park_warm`); parked, its own drop then + // treats the field as stale. + unsafe { drop(std::ptr::read(&raw const act.frame.code)) }; + drop(act); } } } @@ -2408,7 +4362,7 @@ impl Drop for DirectSite { impl DirectSite { /// Record a call of `code` (with or without its self slot): its native /// body if it qualifies, or none until `retry` more calls. - fn fill(&mut self, code: &Rc, has_self: bool, native: usize) { + fn fill(&mut self, code: &Rc, has_self: bool, native: usize, missing: usize) { if Rc::as_ptr(code) as usize != self.code { let old = std::mem::replace(&mut self.code, Rc::into_raw(code.clone()) as usize); if old != 0 { @@ -2417,27 +4371,86 @@ impl DirectSite { } } self.has_self = has_self; + self.missing = missing as u32; self.native = native; self.retry = if native == 0 { 64 } else { 0 }; + self.key = if native == 0 { + 0 + } else { + site_key(self.code, has_self) + }; + self.hot = self.native | self.leaf_key; + } + + /// Record a frameless leaf callee running `code` (with or without its + /// self slot), whose last `missing` parameters take defaults, as the + /// site's first leaf, the one it held before becoming its second. + fn fill_leaf(&mut self, code: &Rc, has_self: bool, missing: usize) { + let at = Rc::as_ptr(code) as usize; + if self.leaf_code != 0 && at != self.leaf_code { + let old = std::mem::replace(&mut self.alt_leaf_code, self.leaf_code); + self.leaf_code = 0; + if old != 0 { + // SAFETY: `old` held the count an earlier fill took. + unsafe { drop(Rc::from_raw(old as *const CodeObject)) }; + } + self.alt_leaf_key = self.leaf_key; + self.alt_leaf_missing = self.leaf_missing; + } + if at != self.leaf_code { + let old = std::mem::replace(&mut self.leaf_code, Rc::into_raw(code.clone()) as usize); + if old != 0 { + // SAFETY: `old` held the count an earlier fill took. + unsafe { drop(Rc::from_raw(old as *const CodeObject)) }; + } + } + self.leaf_key = site_key(at, has_self); + self.leaf_missing = missing as u32; + self.hot = self.native | self.leaf_key; + } + + /// Record a call of `code` with a native body as the site's first + /// callee, the one it held before (if it had a body) becoming its + /// second. + fn promote(&mut self, code: &Rc, has_self: bool, native: usize, missing: usize) { + if self.native != 0 && self.code != 0 && self.code != Rc::as_ptr(code) as usize { + let old = std::mem::replace(&mut self.alt_code, self.code); + self.code = 0; + if old != 0 { + // SAFETY: `old` held the count an earlier fill took. + unsafe { drop(Rc::from_raw(old as *const CodeObject)) }; + } + self.alt_native = self.native; + self.alt_missing = self.missing; + self.alt_has_self = self.has_self; + self.alt_key = self.key; + self.key = 0; + } + self.fill(code, has_self, native, missing); } } /// Whether a call of `f` (running `code`) with `nargs` positional /// arguments binds as [`Interpreter::core_call_plain`] binds it, and -/// `code`'s native body runs from its start: that body. +/// `code`'s native body runs from its start: that body, and how many +/// trailing parameters take `f`'s defaults (with [`CELLS_BIT`] when the +/// callee has cells to bind). fn direct_body<'a>( f: &crate::object::PyFunction, code: &'a CodeObject, nargs: usize, -) -> Option<&'a Native> { +) -> Option<(&'a Native, usize)> { + let missing = (code.arg_count as usize).checked_sub(nargs)?; + // A callee with cell or free variables binds its cells too (see + // `Interpreter::bind_call_cells`). + let cells = !code.cellvars.is_empty() || !code.freevars.is_empty() || !f.closure.is_empty(); if code.is_generator || code.is_coroutine || code.is_async_generator - || !code.cellvars.is_empty() - || !code.freevars.is_empty() - || !f.closure.is_empty() + || (cells && code.cellvars.is_empty() && f.lean_cells_ref(code).is_none()) + || missing >= CELLS_BIT as usize || Interpreter::has_extended_params(code) - || code.arg_count as usize != nargs + || (missing > 0 && !Interpreter::defaults_cover(f, missing)) || code.wire.as_ref().is_some_and(|w| w.exec_error.is_some()) { return None; @@ -2446,9 +4459,13 @@ fn direct_body<'a>( if ext.dispatch_len == 0 { return None; } - ext.frame_jit.get(code.varnames.len().max(nargs)) + let packed = missing | if cells { CELLS_BIT as usize } else { 0 }; + Some((ext.frame_jit.get(code.varnames.len().max(nargs))?, packed)) } +/// A [`DirectSite`]'s `missing` flag for a callee with cells to bind. +const CELLS_BIT: u32 = 1 << 31; + /// `BINARY_OP` (the `pc`th instruction of `code`) over the instances at /// stack slots `slot` and above it whose class's method runs alone (see /// `Interpreter::binop_instance_dunder`): the method called directly @@ -2486,7 +4503,7 @@ unsafe extern "C" fn h_binop_dunder( at.add(2).write(at.add(1).read()); at.add(1).write(at.read()); at.write(Object::Function(f)); - match direct_call( + match direct_call_out( st, pc, slot, @@ -2520,7 +4537,8 @@ unsafe extern "C" fn h_binop_dunder( /// ([`attr_lane`]); the result at stack slot `slot`. The receiver is the /// stack's at `slot` (`local` 0) or the local at `recv`, read in place. /// `0` done, `CALL_DECLINED` declined untouched, `RAISED` or `RELOAD` as -/// [`h_call`]'s. +/// [`h_call`]'s. With [`PROPERTY_ONLY`] in `local`, anything but the cached +/// getter declines instead of taking the full handler. unsafe extern "C" fn h_property( st: *mut State, code: *const CodeObject, @@ -2538,16 +4556,44 @@ unsafe extern "C" fn h_property( if st.sw.is_null() { return CALL_DECLINED; } + let only = local & PROPERTY_ONLY != 0; + let local = local & !PROPERTY_ONLY; let (pc, slot) = (pc as usize, slot as usize); + // The full handler, unless only the cached getter was asked for. + let lane = |st: &mut State| { + if only { + CALL_DECLINED + } else { + attr_lane(st, pc, slot, recv, local) + } + }; + // A frame's or code object's plain field, a live frame's line with + // the running activation's own instruction. + if matches!(&*recv, Object::Frame(_) | Object::Code(_)) && (local != 0 || droppable(&*recv)) + { + let code = &*code; + let running = (Rc::as_ptr(&(*st.frame).locals).cast::<()>(), pc as u32); + let v = code + .names + .get(code.instructions[pc].arg as usize) + .and_then(|name| Interpreter::frame_plain_attr(&*recv, name, Some(running))); + if let Some(v) = v { + let at = st.stack.add(slot); + if local == 0 { + crate::drop_hot(at.read()); + } + at.write(v); + return 0; + } + } let Object::Instance(inst) = &*recv else { - return attr_lane(st, pc, slot, recv, local); + return lane(st); }; let Some((getter, gcode)) = crate::code_vm_ext(&*code) - .and_then(|ext| ext.method_slots.get()) - .and_then(|s| s.get(pc)) + .and_then(|ext| ext.method_slot(pc)) .and_then(|ms| ms.getter(inst.cls_raw().attr_version.get())) else { - return attr_lane(st, pc, slot, recv, local); + return lane(st); }; let at = st.stack.add(slot); // A pure leaf getter (no native body of its own: it never runs as @@ -2573,7 +4619,7 @@ unsafe extern "C" fn h_property( at.add(1).write(at.read()); } at.write(Object::Function(getter)); - match direct_call(st, pc, slot, slot + 2, &mut *site, None) { + match direct_call_out(st, pc, slot, slot + 2, &mut *site, None) { None => { let f = at.read(); if local != 0 { @@ -2582,13 +4628,17 @@ unsafe extern "C" fn h_property( at.write(at.add(1).read()); } drop(f); - attr_lane(st, pc, slot, recv, local) + lane(st) } Some(r) => r, } } } +/// [`h_property`]'s flag (in `local`) for a call that wants the site's +/// cached getter only. +const PROPERTY_ONLY: u64 = 2; + /// The `LOAD_ATTR` at `pc` (its receiver the stack's at `slot`, or the /// local at `recv` when `local`) as the full handler runs it /// (`Interpreter::core_attr_lane`), the frame synced and waiting on the @@ -2638,6 +4688,18 @@ unsafe fn attr_lane( } } +/// A back edge's GIL countdown (at `countdown`) ran out: the fresh count +/// when nobody waits for the GIL (see `Interpreter::countdown_out`), or +/// `0` for the core loop's checkpoint. +unsafe extern "C" fn h_countdown(countdown: *mut u32) -> u32 { + if crate::gil::handoff_idle() { + // SAFETY: the code passes its state's countdown pointer. + unsafe { *countdown = crate::gil::GIL_CHECK_INTERVAL }; + return crate::gil::GIL_CHECK_INTERVAL; + } + 0 +} + /// [`h_call`] with a direct call ([`direct_call`]) of the plain Python /// function `site` caches tried first. (The native code calls `h_call` /// itself for any other callee, and while a site without a body waits @@ -2646,18 +4708,22 @@ unsafe extern "C" fn h_call_direct( st: *mut State, code: *const CodeObject, ext: *const CodeConstObjects, - pc: u64, + pc_argc: u64, len: u64, site: *mut DirectSite, ) -> u32 { - // SAFETY: as `h_call`'s; `site` is this `CALL`'s own cache. + // SAFETY: as `h_call`'s; `site` is this `CALL`'s own cache, and the + // `CALL`'s argument count (the high half of `pc_argc`) fits the stack + // (the native code checked its depth). unsafe { let s = &mut *st; - let argc = (&(*code).instructions)[pc as usize].arg as usize; + let pc = pc_argc & u64::from(u32::MAX); + let argc = (pc_argc >> 32) as usize; let len_u = len as usize; - if len_u >= argc + 2 && !s.sw.is_null() { + debug_assert!(len_u >= argc + 2); + if !s.sw.is_null() { let start = len_u - argc - 2; - if let Some(r) = direct_call(s, pc as usize, start, len_u, &mut *site, None) { + if let Some(r) = direct_call::(s, pc as usize, start, len_u, &mut *site, None) { return r; } } @@ -2665,6 +4731,92 @@ unsafe extern "C" fn h_call_direct( } } +/// `CALL` from a lean body (see [`Lower::call_op`]): a Python function's +/// call tries [`h_call_direct`] first, unless its site found the callee +/// without a native body and has retries left to count down; anything +/// else goes through [`h_call`]. A lean body makes this choice here +/// rather than in line: its code is large enough that compile memory +/// matters more than the branches. +unsafe extern "C" fn h_call_site( + st: *mut State, + code: *const CodeObject, + ext: *const CodeConstObjects, + pc_argc: u64, + len: u64, + site: *mut DirectSite, +) -> u32 { + let argc = (pc_argc >> 32) as usize; + // SAFETY: as `h_call_direct`'s: the callee's slot is on the stack + // below the arguments and its self slot, and `site` is this `CALL`'s + // own cache. + unsafe { + let callee = &*(*st).stack.add(len as usize - argc - 2); + if matches!(callee, Object::Function(_)) { + let site = &mut *site; + if site.hot != 0 || site.retry == 0 { + return h_call_direct(st, code, ext, pc_argc, len, site); + } + site.retry -= 1; + } + h_call(st, code, ext, pc_argc & u64::from(u32::MAX), len) + } +} + +/// Whether a site may evaluate a call of `f` (running `code`) with `nargs` +/// positional arguments as a frameless leaf ([`leaf_site_call`]): a leaf +/// with only positional parameters, at most eight, `nargs` of them given. +/// How many take defaults. +fn site_leaf_fits(f: &crate::object::PyFunction, code: &CodeObject, nargs: usize) -> Option { + let missing = (code.arg_count as usize).checked_sub(nargs)?; + (crate::fn_is_leaf(f) + && !Interpreter::has_extended_params(code) + && code.arg_count <= 8 + && Interpreter::leaf_code_ok(code)) + .then_some(missing) +} + +/// A `CALL`'s (its operands from `start` up a `len`-deep stack) callee, +/// the frameless leaf its site cached (see [`DirectSite::fill_leaf`]), +/// whose last `missing` parameters take defaults, evaluated in place as +/// `h_call` evaluates a leaf callee (`Interpreter::site_leaf_eval`): +/// `true` with the result at `start` (`st.len` past it), `false` declined +/// untouched. +/// +/// # Safety +/// +/// As [`direct_call`]'s; the callee is a plain function whose code is the +/// site's leaf's. +#[inline(never)] +unsafe fn leaf_site_call(st: &mut State, start: usize, len: usize, missing: usize) -> bool { + // SAFETY: the caller's contract. + unsafe { + let base = st.stack; + let ops = std::slice::from_raw_parts(base.add(start), len - start); + let Some(r) = (*st.interp).site_leaf_eval(ops, missing, st.depth_cell) else { + return false; + }; + crate::release_run(base.add(start), len - start); + base.add(start).write(r); + st.len = start + 1; + true + } +} + +/// [`direct_call`] out of line, for the colder lanes (a property getter, +/// an instance operator's method), which share one copy of it. +#[inline(never)] +unsafe fn direct_call_out( + st: &mut State, + pc: usize, + start: usize, + len: usize, + site: &mut DirectSite, + binop: Option<(BinOpKind, bool, &Rc)>, +) -> Option { + // SAFETY: the caller's contract. + unsafe { direct_call::(st, pc, start, len, site, binop) } +} + /// The `CALL` at `pc` (its operands from `start` up a `len`-deep stack) of /// a plain Python function whose body has native code, run straight from /// here: the callee's activation is bound as the core loop's arm binds it @@ -2676,7 +4828,7 @@ unsafe extern "C" fn h_call_direct( /// (`binop`) that leaves the direct return to the core loop carries the /// operator, whose `TypeError` its `NotImplemented` becomes there. #[inline(always)] -unsafe fn direct_call( +unsafe fn direct_call( st: &mut State, pc: usize, start: usize, @@ -2695,52 +4847,226 @@ unsafe fn direct_call( // (The site keys on the code: a fresh function made from the same // `def` binds the same way, and code without free variables takes // no closure.) - if site.code != Rc::as_ptr(code_rc) as usize - || site.has_self != has_self - || site.native == 0 - { + let at = Rc::as_ptr(code_rc) as usize; + let key = site_key(at, has_self); + let (native, packed) = if site.key == key { + (site.native, site.missing as usize) + } else if site.alt_key == key { + (site.alt_native, site.alt_missing as usize) + } else { let nargs = len - start - 2 + usize::from(has_self); - let native = direct_body(f, code_rc, nargs) - .map_or(0, |n| std::ptr::from_ref::(n) as usize); - site.fill(code_rc, has_self, native); + let leaf = CALL && (site.leaf_key == key || site.alt_leaf_key == key); + if leaf { + // The site's frameless leaf, evaluated in place. + let missing = if site.leaf_key == key { + site.leaf_missing + } else { + site.alt_leaf_missing + }; + if leaf_site_call(st, start, len, missing as usize) { + return Some(0); + } + // Declined (a leaf that keeps bailing, or one not warm + // yet): an ordinary call, unless a body compiled since, + // which every few declines check for. + if site.retry != 0 { + site.retry -= 1; + return Some(call_activation_out(st, pc, start, len)); + } + site.retry = 64; + } + let (native, missing) = direct_body(f, code_rc, nargs).map_or((0, 0), |(n, m)| { + (std::ptr::from_ref::(n) as usize, m) + }); if native == 0 { + // A callee with no body (a frameless leaf) leaves the site's + // compiled callees alone. + if site.native == 0 { + site.fill(code_rc, has_self, 0, 0); + } + if leaf { + return Some(call_activation_out(st, pc, start, len)); + } + if CALL { + if let Some(missing) = site_leaf_fits(f, code_rc, nargs) { + site.fill_leaf(code_rc, has_self, missing); + if leaf_site_call(st, start, len, missing) { + return Some(0); + } + return Some(call_activation_out(st, pc, start, len)); + } + } return None; } + site.promote(code_rc, has_self, native, missing); + (native, missing) + }; + let (missing, cells) = ( + packed & !(CELLS_BIT as usize), + packed & CELLS_BIT as usize != 0, + ); + // (Another function running the same code may have rebound its + // defaults, or, a closure, have cells the lean binding can't take.) + if packed != 0 + && ((missing > 0 && !Interpreter::defaults_cover(f, missing)) + || (cells && code_rc.cellvars.is_empty() && f.lean_cells_ref(code_rc).is_none())) + { + return None; } - let native = &*(site.native as *const Native); + let native = &*(native as *const Native); let interp = &mut *st.interp.cast_mut(); let nested = interp.direct_calls.get(); let code: &CodeObject = code_rc; + // (Native code runs only in a burst, which free-threaded mode + // never starts.) + // (Tier 2's compiled code is the commonest test's rare answer.) if nested >= DIRECT_CALL_DEPTH || crate::hot_gates::loop_gen() != st.snap_gen || !native.enters_at(0) - || !interp.inline_calls_ok() - || crate::gil::free_threading_enabled() - || !(crate::tier2::jit_off_for_process() - || code.jit_hint.is_not_jitable() - || !code.jit_hint.is_compiled()) + || !(*st.sw).calls_ok + || (code.jit_hint.is_compiled() + && !code.jit_hint.is_not_jitable() + && !crate::tier2::jit_off_for_process()) { return None; } - let act = interp.inline_pool.pop()?; - let sw = &mut *st.sw; - let crate::recursion::Enter::Ok(guard) = crate::recursion::enter_with(sw.depth_cell) else { - interp.inline_pool.push(act); - return None; + // The site's warm slot, still holding this code (another code's + // goes back to being a plain parked slot), or one from the pool. + let (act, held) = match site.act.take() { + Some(act) if std::ptr::eq(Rc::as_ptr(&act.frame.code), code) => (act, true), + Some(act) => { + // SAFETY: a warm slot holds its code's count. + drop(std::ptr::read(&raw const act.frame.code)); + (act, false) + } + None => (interp.inline_pool.pop()?, false), + }; + let sw = &mut *st.sw; + let crate::recursion::Enter::Ok(guard) = crate::recursion::enter_with(sw.depth_cell) else { + if held { + site.act = Some(act); + } else { + interp.inline_pool.push(act); + } + return None; + }; + // Committed: the caller synced as the core loop's arm syncs it, and + // the callee's activation made the running one. + let caller = &mut *st.frame; + caller.stack.set_len(len); + caller.pc = pc as u32; + *sw.last = st.last; + let saved_last = sw.last; + let callee = interp.core_bind_plain::( + sw, pc, start, has_self, missing, cells, fp, act, guard, held, + ); + crate::burst_stats::note_call(crate::burst_stats::CALL_DIRECT); + let depth = (*sw.inl).len(); + Some(direct_run::( + st, pc, start, callee, depth, native, saved_last, nested, binop, 0, site, + )) + } +} + +/// The activation a `CALL` at `pc` (its operands from `start`) just pushed +/// through the core loop's call paths (`Interpreter::core_call`, +/// `Interpreter::core_call_kw`) for a plain function, run as a direct +/// call's ([`direct_run`]) when its code has a native body entered where +/// it starts. `saved_last` is the caller's last-instruction slot before the +/// switch. `None` touched nothing. +/// +/// # Safety +/// +/// `st` is the caller's live state, its frame synced at the call and its +/// switch non-null. +#[inline(never)] +unsafe fn run_pushed_directly( + st: &mut State, + pc: usize, + start: usize, + saved_last: *mut usize, +) -> Option { + // SAFETY: the caller's contract. + unsafe { + let sw = &mut *st.sw; + if sw.pending.is_some() || std::ptr::eq(sw.cur, st.frame) { + return stats::declined("pending or in place"); + } + let inl = &mut *sw.inl; + let depth = inl.len(); + let callee = sw.cur; + let top = inl.last_mut()?; + if top.gen.is_some() + || top.binop.is_some() + || top.discard + || top.direct + || !std::ptr::eq(&raw const *top.frame, callee) + { + return stats::declined("shape"); + } + let interp = &*st.interp; + let nested = interp.direct_calls.get(); + if nested >= DIRECT_CALL_DEPTH || crate::hot_gates::loop_gen() != st.snap_gen { + return stats::declined("depth or generation"); + } + let cframe = &*callee; + let ext = crate::code_vm_ext(&cframe.code)?; + let nlocals = (*cframe.locals.as_ptr()).len(); + let Some(native) = ext.frame_jit.get(nlocals) else { + ext.frame_jit.warm_switched(&cframe.code, ext, nlocals); + return stats::declined("no body"); }; - // Committed: the caller synced as the core loop's arm syncs it, and - // the callee's activation made the running one. - let caller = &mut *st.frame; - caller.stack.set_len(len); - caller.pc = pc as u32; - *sw.last = st.last; - let saved_last = sw.last; - let callee = interp.core_bind_plain(sw, pc, start, has_self, fp, act, guard); - crate::burst_stats::note_call(crate::burst_stats::CALL_DIRECT); - let depth = (*sw.inl).len(); - if let Some(a) = (*sw.inl).last_mut() { - a.direct = true; + let from = cframe.pc as usize; + if from >= ext.dispatch_len || !native.enters_at(from) { + return stats::declined("no entry"); } + top.direct = true; + Some(direct_run::( + st, + pc, + start, + callee, + depth, + native, + saved_last, + nested, + None, + from, + std::ptr::null_mut(), + )) + } +} + +/// Run a direct call's callee (the running activation, `callee`, at +/// `depth`, marked `direct`) through its native code from `from`, and +/// finish its return here: [`direct_call`]'s `Some` results. `PUSHED` +/// for an activation the core loop's call paths bound (see +/// [`run_pushed_directly`]), whose cells its clean return checks; `site` +/// the direct call's cache otherwise, where its clean return parks the +/// slot. +/// +/// # Safety +/// +/// As [`direct_call`]'s, with the callee bound and switched to. +#[inline(always)] +#[allow(clippy::too_many_arguments)] +unsafe fn direct_run( + st: &mut State, + pc: usize, + start: usize, + callee: *mut crate::Frame, + depth: usize, + native: &Native, + saved_last: *mut usize, + nested: u32, + binop: Option<(BinOpKind, bool, &Rc)>, + from: usize, + site: *mut DirectSite, +) -> u32 { + // SAFETY: the caller's contract. + unsafe { + let interp = &mut *st.interp.cast_mut(); + let caller = &mut *st.frame; let cframe = &mut *callee; let stack = &mut cframe.stack; if stack.capacity() < native.need() { @@ -2749,9 +5075,9 @@ unsafe fn direct_call( let mut cst = State { locals: (*cframe.locals.as_ptr()).as_mut_ptr(), stack: stack.as_mut_ptr(), - len: 0, + len: stack.len(), cap: stack.capacity(), - pc: 0, + pc: from, last: usize::MAX, countdown: st.countdown, snap_gen: st.snap_gen, @@ -2763,16 +5089,27 @@ unsafe fn direct_call( frame: callee, sw: st.sw, gen_depth: 0, + direct: true, }; interp.direct_calls.set(nested + 1); - let status = native.run(&mut cst); + let status = native.run_direct(&mut cst, from); interp.direct_calls.set(nested); let sw = &mut *st.sw; let inl = &mut *sw.inl; - let ours = inl.len() == depth - && inl - .last() - .is_some_and(|a| std::ptr::eq(&raw const *a.frame, callee)); + // (Only the callee's own `RETURN_VALUE` hands back `DIRECT_RET`, + // with its activation the running one.) + let ours = status == DIRECT_RET + || (inl.len() == depth + && inl + .last() + .is_some_and(|a| std::ptr::eq(&raw const *a.frame, callee))); + debug_assert!( + status != DIRECT_RET + || (inl.len() == depth + && inl + .last() + .is_some_and(|a| a.direct && std::ptr::eq(&raw const *a.frame, callee))) + ); // The activation goes on as any other (see `InlineAct::binop`). let leave = |a: &mut crate::InlineAct| { a.direct = false; @@ -2780,32 +5117,56 @@ unsafe fn direct_call( a.binop = Some((op, inplace, cls.clone())); } }; - if status == DIRECT_RET && ours { + if status == DIRECT_RET { let clean = cst.len == 1 - && inl.last().is_some_and(|a| a.act.shell.is_none()) + && inl.last().is_some_and(|a| { + a.act.shell.is_none() + && (!PUSHED + || ((cframe.code.cellvars.is_empty() || a.owns_cells) + && (a.init_inst.is_none() || matches!(&*cst.stack, Object::None)))) + }) && Rc::strong_count(&cframe.locals) == 1 - && interp.gil_countdown > 2 + && !interp.countdown_out(2) && crate::hot_gates::loop_gen() == st.snap_gen; if clean { - // `core_return`'s clean return, with the caller known. + // `core_return`'s clean return, with the caller known (a + // constructor's `__init__` returned `None`: the caller takes + // the instance). let v = cst.stack.read(); cframe.stack.set_len(0); - let mut done = inl.pop().expect("checked above"); + let mut done = inl.pop().unwrap_unchecked(); if depth == sw.entry_depth { sw.entry_dead = true; } - done.clean = true; + let v = if PUSHED { + done.init_inst.take().unwrap_or(v) + } else { + v + }; crate::release_locals(&mut *cframe.locals.as_ptr()); drop(done.guard.take()); interp.lean_pending_exit(done.caller_pending); // SAFETY: moved out once; the parked slot treats the field // as stale (see `inline_deliver`). let callable = std::ptr::read(&raw const done.callable); - interp.inline_park_clean(done); + if done.owns_cells { + done.clean = true; + interp.inline_park_clean(done); + } else if !PUSHED && !site.is_null() && (*site).act.is_none() { + // The slot stays with its call site, still bound to + // the callee's code, for its next call. + (*site).act = Some(interp.inline_park_warm(done)); + } else { + interp.inline_park_direct(done); + } st.stack.add(start).write(v); caller.stack.set_len(start + 1); + // A function something else still holds (its class, its + // module) can't die here: a plain decrement. match callable { - Object::Function(f) if Rc::strong_count(&f) > 1 => drop(f), + Object::Function(f) if crate::rc::try_release_shared(Rc::as_ptr(&f)) => { + std::mem::forget(f); + } callable => interp.release(callable), } sw.cur = st.frame; @@ -2823,11 +5184,15 @@ unsafe fn direct_call( sw.scratch = usize::MAX; } *sw.last = pc; + // (A return raised nothing: the callee's state holds no + // error to drop.) + debug_assert!(cst.err.is_none()); + std::mem::forget(cst); if sw.pending.is_some() { - return Some(RELOAD); + return RELOAD; } st.len = start + 1; - return Some(0); + return 0; } // Any other return is the core loop's arm's (as `h_return`'s). cframe.stack.set_len(cst.len); @@ -2852,9 +5217,9 @@ unsafe fn direct_call( && caller.stack.len() == start + 1 { st.len = start + 1; - return Some(0); + return 0; } - return Some(RELOAD); + return RELOAD; } // The callee stopped partway: its state, synced as the core loop // syncs it after a native run, for the core loop to go on with. @@ -2867,7 +5232,7 @@ unsafe fn direct_call( } else if let Some(e) = cst.err.take() { sw.pending = Some(crate::CoreExit::Stop(crate::LeafStop::Raised(e))); } - Some(RELOAD) + RELOAD } } @@ -2909,6 +5274,42 @@ unsafe extern "C" fn h_call( frame.pc = pc as u32; *(*st.sw).last = st.last; }; + // A generator function's call makes its generator in place + // (`core_call` admits none), ahead of the shapes below, none of + // which a plain function matches. + if let Object::Function(f) = &*base.add(start) { + let c = &*f.code.as_ptr(); + if (c.is_generator || c.is_coroutine || c.is_async_generator) && !st.sw.is_null() { + sync(st); + let sw = &mut *st.sw; + let interp = &mut *st.interp.cast_mut(); + if !interp.core_gen_call(sw, pc) { + if sw.pending.is_none() { + sw.pending = Some(crate::CoreExit::Stop(crate::LeafStop::Step)); + } + return RELOAD; + } + return gen_call_done(st, pc, start); + } + } + // `gen.send(v)`: likewise, with the value sent in. + if argc == 1 + && !st.sw.is_null() + && Interpreter::gen_send_call(&*base.add(start), &*base.add(start + 1)) + { + sync(st); + let sw = &mut *st.sw; + let interp = &mut *st.interp.cast_mut(); + if !interp.core_gen_resume(sw, pc, crate::InlineResume::SendCall) { + sw.pending = Some(crate::CoreExit::Stop(crate::LeafStop::Step)); + } else if std::ptr::eq(sw.cur, st.frame) && sw.pending.is_none() { + // A collapsed chain's fast step delivered the result (see + // `Interpreter::chain_step`). + st.len = (*st.frame).stack.len(); + return 0; + } + return RELOAD; + } // `next(gen)`: the generator resumes inline, as for `FOR_ITER`, // with the yield as the call's result. if argc == 1 @@ -2921,19 +5322,95 @@ unsafe extern "C" fn h_call( if st.sw.is_null() { return CALL_DECLINED; } + let interp = &mut *st.interp.cast_mut(); + // A simple body steps to its next yield in place, as the core + // loop's arm steps it (see `gen_fast`). + if let (Object::Generator(g), true) = + (&*base.add(start + 2), Interpreter::core_drops_plain()) + { + match interp.gen_fast_next(g, st.snap_gen, 0, st.maybe_dead) { + crate::gen_fast::GenNext::Yielded(v) => { + // The builtin and the generator (the stack's own + // slots hold them past the step) leave by plain + // decrements; the value takes the callee's slot. + crate::release_run(base.add(start), 3); + base.add(start).write(v); + st.len = start + 1; + return 0; + } + // `next(gen)` raises `StopIteration(value)`. + crate::gen_fast::GenNext::Exhausted(v) => { + crate::release_run(base.add(start), 3); + st.len = start; + st.pc = pc + 1; + st.err = Some(crate::error::stop_iteration_with(v)); + return RAISED; + } + crate::gen_fast::GenNext::Declined | crate::gen_fast::GenNext::Partial => {} + } + } sync(st); let sw = &mut *st.sw; - let interp = &mut *st.interp.cast_mut(); if !interp.core_gen_resume(sw, pc, crate::InlineResume::NextCall) { sw.pending = Some(crate::CoreExit::Stop(crate::LeafStop::Step)); + } else if std::ptr::eq(sw.cur, st.frame) && sw.pending.is_none() { + // A collapsed chain's fast step delivered the result (see + // `Interpreter::chain_step`). + st.len = (*st.frame).stack.len(); + return 0; + } + return RELOAD; + } + // `next(gen, default)`: likewise, the default the result of an + // exhausted generator. + if argc == 2 + && matches!( + (&*base.add(start), &*base.add(start + 1), &*base.add(start + 2)), + (Object::Builtin(b), Object::Unbound, Object::Generator(_)) + if Rc::as_ptr(b) as usize == interp.leaf_fns().next_ptr + ) + { + if st.sw.is_null() { + return CALL_DECLINED; + } + let interp = &mut *st.interp.cast_mut(); + // A simple body's step in place, as for `next(gen)` above. + if let (Object::Generator(g), true) = + (&*base.add(start + 2), Interpreter::core_drops_plain()) + { + match interp.gen_fast_next(g, st.snap_gen, 0, st.maybe_dead) { + crate::gen_fast::GenNext::Yielded(v) => { + crate::release_run(base.add(start), 4); + base.add(start).write(v); + st.len = start + 1; + return 0; + } + // The default is the result. + crate::gen_fast::GenNext::Exhausted(v) => { + drop(v); + let default = base.add(start + 3).read(); + crate::release_run(base.add(start), 3); + base.add(start).write(default); + st.len = start + 1; + return 0; + } + crate::gen_fast::GenNext::Declined | crate::gen_fast::GenNext::Partial => {} + } + } + sync(st); + let sw = &mut *st.sw; + if !interp.core_gen_resume(sw, pc, crate::InlineResume::NextDefault) { + sw.pending = Some(crate::CoreExit::Stop(crate::LeafStop::Step)); + } else if std::ptr::eq(sw.cur, st.frame) && sw.pending.is_none() { + // As for `next(gen)` above. + st.len = (*st.frame).stack.len(); + return 0; } return RELOAD; } Interpreter::core_instance_callee(base.add(start)); let done = |st: &mut State, r: Object| { - for k in start..len { - crate::drop_hot(base.add(k).read()); - } + crate::release_run(base.add(start), len - start); base.add(start).write(r); st.len = start + 1; 0 @@ -2942,11 +5419,7 @@ unsafe extern "C" fn h_call( // fast half), without the shape checks below; a decline falls // through to them untouched. if let Object::Builtin(b) = &*base.add(start) { - let kind = ext - .method_slots - .get() - .and_then(|s| s.get(pc)) - .and_then(|s| s.get_leaf(b)); + let kind = ext.method_slot(pc).and_then(|s| s.get_leaf(b)); if matches!(kind, Some(LeafKind::Isinstance | LeafKind::Fast(_))) && Rc::strong_count(b) > 1 && !st.sw.is_null() @@ -2966,9 +5439,7 @@ unsafe extern "C" fn h_call( None => {} Some(Ok(v)) => return done(st, v), Some(Err(e)) => { - for k in start..len { - crate::drop_hot(base.add(k).read()); - } + crate::release_run(base.add(start), len - start); st.len = start; st.pc = pc + 1; st.err = Some(e); @@ -3001,39 +5472,12 @@ unsafe extern "C" fn h_call( _ => None, }; if let Some(r) = r { + crate::note_type_site(Some(ext), pc, &ops[0]); return done(st, r); } } if python != 0 { - // A Python callee's activation, switched to as the arm does - // (the frame synced first; a declined switch leaves the call - // to the quiet loop). - if st.sw.is_null() { - return CALL_DECLINED; - } - sync(st); - let sw = &mut *st.sw; - let interp = &mut *st.interp.cast_mut(); - let switched = if python == 1 { - interp.core_call(sw, pc) || interp.core_gen_call(sw, pc) - } else { - interp.core_new(sw, pc, st.snap_gen) - }; - if !switched && sw.pending.is_none() { - sw.pending = Some(crate::CoreExit::Stop(crate::LeafStop::Step)); - } - // A compiled callee runs from here, and its return continues - // this code natively (anything else leaves for the core loop). - if switched && sw.pending.is_none() && !std::ptr::eq(sw.cur, st.frame) { - if run_callee_directly(st, start) { - st.len = start + 1; - return 0; - } - } - if switched && finished_in_place(st, start) { - return 0; - } - return RELOAD; + return call_activation(st, pc, start, len, python); } // A builtin type's call (`range(a, b)`, `float(x)`, `list(xs)`), as // the core loop's arms run it: in place when nothing it does can @@ -3041,6 +5485,7 @@ unsafe extern "C" fn h_call( if let Object::Type(t) = &ops[0] { if t.flags.is_builtin { if let Some(r) = interp.core_builtin_ctor(base, start, len) { + crate::note_type_site(Some(ext), pc, &*base.add(start)); return done(st, r); } if argc == 1 && !st.sw.is_null() { @@ -3059,7 +5504,7 @@ unsafe extern "C" fn h_call( } // A builtin the site has settled as a leaf (one it hasn't runs // through the core loop's builtin lane). - let Some(slot) = ext.method_slots.get().and_then(|s| s.get(pc)) else { + let Some(slot) = ext.method_slot(pc) else { return CALL_DECLINED; }; // A builtin the site settled on running in the core loop's lane (a @@ -3162,14 +5607,380 @@ unsafe extern "C" fn h_call( None => leaf_call_lane(st, pc, start, len), Some(Ok(v)) => done(st, v), Some(Err(e)) => { - for k in start..len { - crate::drop_hot(base.add(k).read()); + crate::release_run(base.add(start), len - start); + st.len = start; + st.pc = pc + 1; + st.err = Some(e); + RAISED + } + } + } +} + +/// [`call_activation`] of a plain function out of line, for a direct +/// call's site whose frameless leaf declined (`h_call` keeps its own copy +/// in line). +/// +/// # Safety +/// +/// As `h_call`'s. +#[inline(never)] +unsafe fn call_activation_out(st: &mut State, pc: usize, start: usize, len: usize) -> u32 { + // SAFETY: the caller's contract. + unsafe { call_activation(st, pc, start, len, 1) } +} + +/// The `CALL` at `pc` (its operands from `start` up a `len`-deep stack) of +/// a Python callee (`python` 1, a function or a bound method over one) or +/// a Python class's constructor (`python` 2), its activation switched to +/// as the core loop's arm switches it (the frame synced first; a declined +/// switch leaves the call to the quiet loop): `h_call`'s results. +/// +/// # Safety +/// +/// As `h_call`'s. +#[inline(always)] +unsafe fn call_activation(st: &mut State, pc: usize, start: usize, len: usize, python: u8) -> u32 { + // SAFETY: the caller's contract. + unsafe { + if st.sw.is_null() { + return CALL_DECLINED; + } + let frame = &mut *st.frame; + frame.stack.set_len(len); + frame.pc = pc as u32; + *(*st.sw).last = st.last; + let sw = &mut *st.sw; + let saved_last = sw.last; + let interp = &mut *st.interp.cast_mut(); + // (A generator function's call was made by `h_call` before.) + let switched = if python == 1 { + if interp.core_call(sw, pc) { + true + } else if interp.core_gen_call(sw, pc) { + return gen_call_done(st, pc, start); + } else { + false + } + } else { + interp.core_new(sw, pc, st.snap_gen) + }; + if !switched && sw.pending.is_none() { + sw.pending = Some(crate::CoreExit::Stop(crate::LeafStop::Step)); + } + // A compiled callee runs from here, and its return continues + // this code natively (anything else leaves for the core loop). + if switched && sw.pending.is_none() && !std::ptr::eq(sw.cur, st.frame) { + if let Some(r) = run_pushed_directly(st, pc, start, saved_last) { + return r; + } + if run_callee_directly(st, start) { + st.len = start + 1; + return 0; + } + } + if switched && finished_in_place(st, start) { + return 0; + } + RELOAD + } +} + +/// `len(x)` of an exact container or string. +fn len_fast(args: &[Object]) -> Option> { + // SAFETY: reads between two instructions (the lengths run no code). + let n = unsafe { + match args { + [Object::List(l)] => l.peek()?.len(), + [Object::Tuple(t)] => t.len(), + [Object::Str(s)] => crate::shared_value::SharedStr::char_count(s), + [Object::Dict(d)] => d.peek()?.len(), + [Object::Set(s)] => s.peek()?.len(), + [Object::Bytes(b)] => b.len(), + _ => return None, + } + }; + Some(Ok(Object::Int(n as i64))) +} + +/// A `CALL` site settled on a builtin when its code compiled (see +/// `Lower::call_op`): the builtin (the native code holds it, so its address +/// names it for as long as the code lives), the operand count, and how the +/// site runs it: a leaf kind (with the [`Kernel`] its receiver variant +/// takes, if any, and that variant's tag), or a body through the core +/// loop's lane. +pub(crate) struct BuiltinSite { + f: *const crate::object::BuiltinFn, + argc: usize, + kind: Option, + kernel: Option, + recv_tag: u8, + via_call: bool, +} + +/// [`h_call`] at a site settled on a container's or string's leaf method +/// with a [`Kernel`] (`site`'s): the callee checked to be that builtin by +/// its address and the receiver in the self slot to be the kernel's +/// variant, then the kernel run on the operands in place and the operands +/// released; anything else (another callee or receiver, a declined call) +/// through `h_call`. +unsafe extern "C" fn h_call_kernel( + st: *mut State, + code: *const CodeObject, + ext: *const CodeConstObjects, + pc: u64, + len: u64, + site: *const BuiltinSite, +) -> u32 { + // SAFETY: as `h_call`'s; the site is this `CALL`'s, and the code holds + // its builtin. + unsafe { + let s = &mut *st; + let site = &*site; + let lenu = len as usize; + let start = lenu - site.argc - 2; + let base = s.stack; + // The receiver: the self slot's, or a bound method's (`append = + // y.append`) with the slot empty. + let recv: *const Object = match (&*base.add(start), &*base.add(start + 1)) { + (Object::Builtin(b), _) if std::ptr::eq(Rc::as_ptr(b), site.f) => base.add(start + 1), + (Object::BoundMethod(bm), Object::Unbound) + if !bm.redispatch_descriptor + && matches!(&bm.function, Object::Builtin(b) if std::ptr::eq(Rc::as_ptr(b), site.f)) => + { + &raw const bm.receiver + } + _ => std::ptr::null(), + }; + if let (false, Some(kernel), false) = (recv.is_null(), site.kernel, s.sw.is_null()) { + if (*recv).tag() == site.recv_tag { + let arg = |k: usize| { + if k <= site.argc { + base.add(start + 1 + k).cast_const() + } else { + std::ptr::null() + } + }; + let mut out = std::mem::MaybeUninit::::uninit(); + if kernel(out.as_mut_ptr(), recv, arg(1), arg(2), site.f) == 0 { + crate::release_operands(&*s.interp, base.add(start), lenu - start); + base.add(start).write(out.assume_init()); + s.len = start + 1; + return 0; + } + } + } + h_call(st, code, ext, pc, len) + } +} + +/// [`h_call`] at a site settled on a leaf builtin whose kind runs in place +/// (see `LeafKind::runs_in_core`; `site`'s): the callee checked to be that +/// builtin by its address, then the leaf body the kind names run on the +/// operands in place, which are released after; anything else (another +/// callee, a declined shape) through `h_call`. +unsafe extern "C" fn h_call_leaf( + st: *mut State, + code: *const CodeObject, + ext: *const CodeConstObjects, + pc: u64, + len: u64, + site: *const BuiltinSite, +) -> u32 { + use crate::LeafKind; + // SAFETY: as `h_call`'s; the site is this `CALL`'s, and the code holds + // its builtin. + unsafe { + let s = &mut *st; + let site = &*site; + let lenu = len as usize; + let start = lenu - site.argc - 2; + let base = s.stack; + let hit = + matches!(&*base.add(start), Object::Builtin(b) if std::ptr::eq(Rc::as_ptr(b), site.f)); + if hit && !s.sw.is_null() { + let first = if matches!(&*base.add(start + 1), Object::Unbound) { + start + 2 + } else { + start + 1 + }; + let args = std::slice::from_raw_parts(base.add(first), lenu - first); + let b = &*site.f; + // (A body that runs no Python code for any arguments, or for + // scalar ones: as `h_call` and `leaf_builtin_call` run them.) + let body = || { + Some(match b.call_kw.as_ref() { + Some(ckw) => ckw(args, &[]), + None => (b.call)(args), + }) + }; + let r = match site.kind { + Some(LeafKind::Fast(f)) => f(args), + Some(LeafKind::Len) => len_fast(args), + Some(LeafKind::Isinstance) => Interpreter::core_isinstance(args), + Some(LeafKind::Opaque) => body(), + Some(LeafKind::Scalar) => { + if args + .iter() + .all(|a| matches!(a, Object::Int(_) | Object::Float(_) | Object::Bool(_))) + { + body() + } else { + None + } + } + Some(k) => (*s.interp).leaf_builtin_call(k, b, args), + None => None, + }; + match r { + None => {} + Some(Ok(v)) => { + // The operands leave by their releases. + crate::release_operands(&*s.interp, base.add(start), lenu - start); + base.add(start).write(v); + s.len = start + 1; + return 0; + } + Some(Err(e)) => { + crate::release_operands(&*s.interp, base.add(start), lenu - start); + s.len = start; + s.pc = pc as usize + 1; + s.err = Some(e); + return RAISED; + } + } + } + h_call(st, code, ext, pc, len) + } +} + +/// A `CALL` site that constructed a builtin type in place when its code +/// compiled (see `Lower::call_op`): the type and the operand count. +pub(crate) struct TypeSite { + cls: Rc, + argc: usize, +} + +/// [`h_call`] at a site settled on a builtin type `site` names: the callee +/// checked to be that type, with an empty self slot, and its constructor +/// run in place when nothing it does can run Python code (as +/// `Interpreter::core_builtin_ctor` runs it), the operands released after; +/// anything else through `h_call`. +unsafe extern "C" fn h_call_type( + st: *mut State, + code: *const CodeObject, + ext: *const CodeConstObjects, + pc: u64, + len: u64, + site: *const TypeSite, +) -> u32 { + // SAFETY: as `h_call`'s; the site is this `CALL`'s. + unsafe { + let s = &mut *st; + let site = &*site; + let lenu = len as usize; + let start = lenu - site.argc - 2; + let base = s.stack; + let hit = matches!(&*base.add(start), Object::Type(t) if Rc::ptr_eq(t, &site.cls)) + && matches!(&*base.add(start + 1), Object::Unbound); + if hit && !s.sw.is_null() { + let args = std::slice::from_raw_parts(base.add(start + 2), site.argc); + let interp = &*s.interp; + if let Some(v) = interp + .leaf_type_call(&site.cls, args) + .or_else(|| crate::seqiter::builtin_ctor_pure(&site.cls, args)) + { + crate::release_operands(interp, base.add(start), lenu - start); + base.add(start).write(v); + s.len = start + 1; + return 0; + } + } + h_call(st, code, ext, pc, len) + } +} + +/// [`h_call`] at a site settled on a builtin whose body the core loop's +/// lane runs (see `Interpreter::core_native_body`), named by `site`: the +/// callee checked to be that builtin by its address (a method with its +/// receiver in the self slot, a function with the slot empty, or a bound +/// method of it with the slot empty), the +/// frame synced, and the body run on the operands in place. `0` the result +/// in the callee's slot (the same activation running, nothing pending), +/// `RAISED` the body raised (likewise), `RELOAD` the core loop goes on +/// from the synced frame; anything else (another callee or shape) through +/// `h_call`. +unsafe extern "C" fn h_call_native( + st: *mut State, + code: *const CodeObject, + ext: *const CodeConstObjects, + pc: u64, + len: u64, + site: *const BuiltinSite, +) -> u32 { + // SAFETY: as `h_call`'s; the site is this `CALL`'s, and the code holds + // its builtin. + unsafe { + let s = &mut *st; + let site = &*site; + let (pcu, lenu) = (pc as usize, len as usize); + let start = lenu - site.argc - 2; + let base = s.stack; + let hit = match (&*base.add(start), &*base.add(start + 1)) { + (Object::Builtin(b), Object::Unbound) => { + std::ptr::eq(Rc::as_ptr(b), site.f) && !b.binds_instance + } + (Object::Builtin(b), recv) => { + std::ptr::eq(Rc::as_ptr(b), site.f) && crate::lane_recv_ok(b, recv, site.via_call) + } + // A bound method held in a local (`reductor = x.__reduce_ex__`). + // (A class's bound method may have a natively served half: + // `h_call`'s.) + (Object::BoundMethod(bm), Object::Unbound) + if !bm.redispatch_descriptor && !matches!(&bm.receiver, Object::Type(_)) => + { + matches!(&bm.function, Object::Builtin(b) + if std::ptr::eq(Rc::as_ptr(b), site.f) + && crate::lane_recv_ok(b, &bm.receiver, site.via_call)) + } + _ => false, + }; + if !hit || s.sw.is_null() { + return h_call(st, code, ext, pc, len); + } + // The frame synced, as the core loop's arm syncs it. + let frame = &mut *s.frame; + frame.stack.set_len(lenu); + let sw = &mut *s.sw; + *sw.last = s.last; + let interp = &mut *s.interp.cast_mut(); + let r = interp.core_native_body(sw, frame, pcu, start, site.f, site.via_call); + let in_place = sw.pending.is_none() + && std::ptr::eq(sw.cur, s.frame) + && crate::hot_gates::loop_gen() == s.snap_gen; + match r { + // The result in the callee's slot. + None if in_place => { + s.len = start + 1; + 0 + } + None => { + *sw.last = pcu; + if sw.pending.is_none() && (*sw.maybe_dead).get() { + sw.pending = Some(crate::CoreExit::Stop(crate::LeafStop::Marked)); } - st.len = start; - st.pc = pc + 1; - st.err = Some(e); + RELOAD + } + Some(e) if in_place => { + s.len = start; + s.pc = pcu + 1; + s.err = Some(e); RAISED } + Some(e) => { + sw.pending = Some(crate::CoreExit::Stop(crate::LeafStop::Raised(e))); + RELOAD + } } } } @@ -3207,6 +6018,123 @@ unsafe fn leaf_call_lane(st: &mut State, pc: usize, start: usize, len: usize) -> } } +/// The `CALL_KW` at `pc` of `code` (its operands from `start` up a +/// `len`-deep stack: the callee, its self slot, `argc` positionals, `kwc` +/// keyword values and the names tuple) of a plain function whose body has +/// native code, called directly as [`direct_call`] calls one: the site's +/// verified `CallPyKwNames` permutation binds the keywords +/// (`Interpreter::core_bind_kw_direct`), and the callee's return comes +/// back here. `None` touched nothing (the core loop's keyword call takes +/// it, filling the site's slot). +/// +/// # Safety +/// +/// As [`direct_call`]'s. +#[inline(never)] +unsafe fn direct_call_kw( + st: &mut State, + code: &CodeObject, + pc: usize, + start: usize, + len: usize, + argc: usize, + kwc: usize, +) -> Option { + use weavepy_compiler::InlineCache as IC; + // SAFETY: the caller's contract. + unsafe { + let Object::Function(f) = &*st.stack.add(start) else { + return None; + }; + let IC::CallPyKwNames { + func_id, + perm, + argc: ca, + kwc: ck, + } = code.caches.get(pc as u32) + else { + return None; + }; + let has_self = !matches!(&*st.stack.add(start + 1), Object::Unbound); + let eff_argc = argc + usize::from(has_self); + if ca as usize != eff_argc || ck as usize != kwc { + return None; + } + let fp = Rc::as_ptr(f); + let code_rc: &Rc = &*f.code.as_ptr(); + // The binding the site verified for this function and code (see + // `Interpreter::kw_names_bind_cached`, whose slow half fills it). + if crate::specialize::rc_id(f) != func_id || f.defaults_maybe_overridden() { + return None; + } + let (covered, _) = crate::code_call_slot(code, pc)?.hit(fp, Rc::as_ptr(code_rc))?; + let callee: &CodeObject = code_rc; + if callee.is_generator + || callee.is_coroutine + || callee.is_async_generator + || callee.has_varargs + || callee.has_varkeywords + || !callee.cellvars.is_empty() + || !callee.freevars.is_empty() + || !f.closure.is_empty() + || !Interpreter::lean_code_ok(callee) + { + return None; + } + let ext = crate::code_vm_ext(callee)?; + let native = ext.frame_jit.get(callee.varnames.len())?; + let interp = &mut *st.interp.cast_mut(); + let nested = interp.direct_calls.get(); + if nested >= DIRECT_CALL_DEPTH + || crate::hot_gates::loop_gen() != st.snap_gen + || !native.enters_at(0) + || !(*st.sw).calls_ok + || (callee.jit_hint.is_compiled() + && !callee.jit_hint.is_not_jitable() + && !crate::tier2::jit_off_for_process()) + { + return None; + } + let act = interp.inline_pool.pop()?; + let sw = &mut *st.sw; + let crate::recursion::Enter::Ok(guard) = crate::recursion::enter_with(sw.depth_cell) else { + interp.inline_pool.push(act); + return None; + }; + // Committed: the caller synced as the core loop's arm syncs it, and + // the callee's activation made the running one. + let caller = &mut *st.frame; + caller.stack.set_len(len); + caller.pc = pc as u32; + *sw.last = st.last; + let saved_last = sw.last; + let cframe = interp.core_bind_kw_direct( + sw, + pc, + has_self, + fp, + (perm, covered, kwc, argc), + act, + guard, + ); + crate::burst_stats::note_call(crate::burst_stats::CALL_DIRECT); + let depth = (*sw.inl).len(); + Some(direct_run::( + st, + pc, + start, + cframe, + depth, + native, + saved_last, + nested, + None, + 0, + std::ptr::null_mut(), + )) + } +} + /// `CALL_KW` (the `pc`th instruction of `code`) on a stack `len` deep, as /// the core loop's arm runs it: a natively served class's constructor, a /// native method or builtin that takes keywords, or a pure leaf callee in @@ -3255,47 +6183,373 @@ unsafe extern "C" fn h_call_kw(st: *mut State, code: *const CodeObject, pc: u64, if !matches!(&ops[0], Object::Function(_)) || st.sw.is_null() { return CALL_DECLINED; } + // A compiled one whose keywords the site's permutation places + // runs directly, as `CALL`'s does. + if let Some(r) = direct_call_kw(st, code, pc, start, len, argc, kwc) { + return r; + } let frame = &mut *st.frame; frame.stack.set_len(len); frame.pc = pc as u32; let sw = &mut *st.sw; *sw.last = st.last; + let saved_last = sw.last; let interp = &mut *st.interp.cast_mut(); - if !interp.core_call_kw(sw, pc) && sw.pending.is_none() { - sw.pending = Some(crate::CoreExit::Stop(crate::LeafStop::Step)); + if !interp.core_call_kw(sw, pc) { + if sw.pending.is_none() { + sw.pending = Some(crate::CoreExit::Stop(crate::LeafStop::Step)); + } + return RELOAD; + } + // A compiled callee runs from here, as for `CALL`. + if let Some(r) = run_pushed_directly(st, pc, start, saved_last) { + return r; } return RELOAD; }; - for k in start..len { - crate::drop_hot(base.add(k).read()); - } + crate::release_run(base.add(start), len - start); base.add(start).write(r); 0 } } -/// `RETURN_VALUE` (the `pc`th instruction) of an inline activation with -/// the value atop a `len`-deep stack: the frame synced and the caller -/// switched back to as the core loop's arm does (`RELOAD`), the state -/// synced for a direct caller to finish it (`DIRECT_RET`, see -/// [`direct_call`]), or `0` for the root activation's, which the core -/// loop's quiet loop returns from. -unsafe extern "C" fn h_return(st: *mut State, pc: u64, len: u64) -> u32 { - // SAFETY: the code passes its live state, whose switch is the core - // loop's (non-null: generator bodies don't return through here), and - // its stack depth. +/// `CALL_FUNCTION_EX` (the `pc`th instruction of `code`) on a stack `len` +/// deep, as the core loop's arm runs it (`Interpreter::core_call_ex`, else +/// its lane), the frame synced first: `0` the result in place (a compiled +/// callee run from here, as for `CALL`, or a call finished in place), +/// `RELOAD` the core loop goes on. +unsafe extern "C" fn h_call_ex(st: *mut State, code: *const CodeObject, pc: u64, len: u64) -> u32 { + // SAFETY: the code passes its live state, its own code, one of its + // `CALL_FUNCTION_EX`s and its stack depth. + unsafe { + let _ = code; + let st = &mut *st; + let (pc, len) = (pc as usize, len as usize); + if st.sw.is_null() || len < 4 { + return CALL_DECLINED; + } + let start = len - 4; + let frame = &mut *st.frame; + frame.stack.set_len(len); + frame.pc = pc as u32; + let sw = &mut *st.sw; + *sw.last = st.last; + let saved_last = sw.last; + let interp = &mut *st.interp.cast_mut(); + if !interp.core_call_ex(sw, pc, st.snap_gen) { + if sw.pending.is_none() && !interp.core_call_lane(sw) { + sw.pending = Some(crate::CoreExit::Stop(crate::LeafStop::Step)); + } + return if finished_in_place(st, start) { + 0 + } else { + RELOAD + }; + } + if sw.pending.is_none() && !std::ptr::eq(sw.cur, st.frame) { + if let Some(r) = run_pushed_directly(st, pc, start, saved_last) { + return r; + } + if run_callee_directly(st, start) { + st.len = start + 1; + return 0; + } + } + if finished_in_place(st, start) { + return 0; + } + RELOAD + } +} + +/// `f(*args, **kwargs)`'s forwarding run (see `forward_call_shape`) +/// opening at the `BUILD_MAP` at `pc` on a stack `len` deep, as the core +/// loop's arm runs it (`Interpreter::core_call_forward`), the frame synced +/// first: `0` the call's result in place (as [`h_call_ex`]'s), `RELOAD` +/// the core loop goes on, `CALL_DECLINED` untouched. +unsafe extern "C" fn h_call_forward( + st: *mut State, + code: *const CodeObject, + pc: u64, + len: u64, +) -> u32 { + // SAFETY: the code passes its live state, its own code, one of its + // forwarding `BUILD_MAP`s and its stack depth. + unsafe { + let _ = code; + let st = &mut *st; + let (pc, len) = (pc as usize, len as usize); + if st.sw.is_null() || len < 3 { + return CALL_DECLINED; + } + let start = len - 3; + let frame = &mut *st.frame; + frame.stack.set_len(len); + frame.pc = pc as u32; + let sw = &mut *st.sw; + *sw.last = st.last; + let saved_last = sw.last; + let interp = &mut *st.interp.cast_mut(); + if !interp.core_call_forward(sw, pc) { + return if sw.pending.is_some() { + RELOAD + } else { + CALL_DECLINED + }; + } + if sw.pending.is_none() && !std::ptr::eq(sw.cur, st.frame) { + // (The call's own pc, three on, is the caller's last.) + if let Some(r) = run_pushed_directly(st, pc + 3, start, saved_last) { + return r; + } + if run_callee_directly(st, start) { + st.len = start + 1; + return 0; + } + } + if finished_in_place(st, start) { + return 0; + } + RELOAD + } +} + +/// `RETURN_VALUE` (the `pc`th instruction) of an inline activation with +/// the value atop a `len`-deep stack: the frame synced and the caller +/// switched back to as the core loop's arm does (`RELOAD`), the state +/// synced for a direct caller to finish it (`DIRECT_RET`, see +/// [`direct_call`]), or `0` for the root activation's, which the core +/// loop's quiet loop returns from. +unsafe extern "C" fn h_return(st: *mut State, pc: u64, len: u64) -> u32 { + // SAFETY: the code passes its live state, whose switch is the core + // loop's (non-null: generator bodies don't return through here), and + // its stack depth. + unsafe { + let st = &mut *st; + let sw = &mut *st.sw; + let Some(top) = (*sw.inl).last() else { + return 0; + }; + // A direct call's activation: its caller finishes the return. + if top.direct && std::ptr::eq(&raw const *top.frame, st.frame) { + st.len = len as usize; + st.pc = pc as usize; + return DIRECT_RET; + } + let frame = &mut *st.frame; + frame.stack.set_len(len as usize); + frame.pc = pc as u32; + *sw.last = st.last; + let interp = &mut *st.interp.cast_mut(); + if !interp.core_return(sw, st.snap_gen) { + sw.pending = Some(crate::CoreExit::Stop(crate::LeafStop::Step)); + } + RELOAD + } +} + +/// `GET_AWAITABLE` (`kind` 0) or `GET_YIELD_FROM_ITER` (`kind` 1) of the +/// value at `at` (the stack's top), as the core loop's arms run them: `0` +/// the delegate in place (a coroutine nothing has started, a generator, +/// or an instance's generator `__await__` / `__iter__`, made here), +/// anything else declined untouched. +unsafe extern "C" fn h_await_iter(st: *mut State, at: *mut Object, kind: u64) -> u32 { + // SAFETY: the code passes its live state and its initialized top slot. + unsafe { + let st = &*st; + let top = &*at; + let ok = if kind == 0 { + match top { + // A read between instructions. + Object::Coroutine(g) => g + .state() + .peek() + .is_some_and(|s| matches!(s, crate::object::GeneratorState::Created(_))), + // A `types.coroutine` generator is its own. + Object::Generator(g) => { + matches!(&g.code, Object::Code(c) if c.is_iterable_coroutine) + } + _ => false, + } + } else { + let code = &(*st.frame).code; + match top { + Object::Generator(_) => true, + Object::Coroutine(_) => code.is_coroutine || code.is_iterable_coroutine, + _ => false, + } + }; + if ok { + return 0; + } + if matches!(top, Object::Instance(_)) && Interpreter::core_droppable(top) { + let name = if kind == 0 { "__await__" } else { "__iter__" }; + if let Some(gen) = (*st.interp).instance_gen_call(top, name) { + // The instance (droppable) is replaced in place. + crate::drop_hot(std::mem::replace(&mut *at, gen)); + return 0; + } + } + 1 + } +} + +/// [`h_send`]'s status for a delegate's fast step that yielded: the value +/// in the sent one's place, for the code to go on at the `YIELD_VALUE`. +const SEND_YIELDED: u32 = 2; + +/// `SEND` at `pc` of the running activation, its stack `len` deep: the +/// generator or coroutine below the top resumed and switched to as the +/// core loop's arm does (`RELOAD`), or, a compiled delegate run from here +/// (or a simple one's fast step) that returned into this `SEND`, its +/// result in the sent value's place for the code to go on at the +/// `END_SEND` (`0`), or a fast step's yield ([`SEND_YIELDED`]); anything +/// else (another delegate, or a generator's fast step, which never +/// switches) declined untouched. +unsafe extern "C" fn h_send(st: *mut State, pc: u64, len: u64) -> u32 { + // SAFETY: the code passes its live state and its stack depth (the + // delegate and the sent value on top). + unsafe { + let st = &mut *st; + let len = len as usize; + if st.sw.is_null() + || len < 2 + || !matches!( + &*st.stack.add(len - 2), + Object::Generator(_) | Object::Coroutine(_) + ) + { + return 1; + } + // A simple generator steps to its next yield in place, as the core + // loop's arm steps it (see `gen_fast`). + if let (Object::Generator(g), Object::None) = + (&*st.stack.add(len - 2), &*st.stack.add(len - 1)) + { + if crate::gen_fast::may_step(g) { + if let Some(r) = h_send_step(st, pc, len) { + return r; + } + } + } + let interp = &mut *st.interp.cast_mut(); + let sw = &mut *st.sw; + let frame = &mut *st.frame; + frame.stack.set_len(len); + frame.pc = pc as u32; + *sw.last = st.last; + if !interp.core_gen_resume(sw, pc as usize, crate::InlineResume::Send) { + sw.pending = Some(crate::CoreExit::Stop(crate::LeafStop::Step)); + return RELOAD; + } + // A collapsed chain's fast step delivered the yield without a + // switch (see `Interpreter::chain_step`). + if std::ptr::eq(sw.cur, st.frame) && sw.pending.is_none() { + st.len = len; + return SEND_YIELDED; + } + if sw.pending.is_none() && !std::ptr::eq(sw.cur, st.frame) && run_switched_directly(st) { + let frame = &*st.frame; + let exit = pc as usize + 1 + frame.code.instructions[pc as usize].arg as usize; + if frame.pc as usize == exit && frame.stack.len() == len { + st.len = len; + return 0; + } + } + RELOAD + } +} + +/// [`h_send`]'s fast step of the generator below the sent `None` (one a +/// step may run): what it yields takes the sent value's slot (the code +/// goes on at its yield, [`SEND_YIELDED`]), or its return value does as +/// the `SEND` exits (`0`); `None` when the step declined, untouched. +/// +/// # Safety +/// +/// As [`h_send`]'s, the generator and `None` atop the stack. +#[inline(never)] +unsafe fn h_send_step(st: &mut State, pc: u64, len: usize) -> Option { + // SAFETY: the caller's contract. + unsafe { + let arg = (&*st.frame).code.instructions[pc as usize].arg; + if arg & crate::GEN_SEND != 0 { + return None; + } + let Object::Generator(g) = &*st.stack.add(len - 2) else { + return None; + }; + let interp = &mut *st.interp.cast_mut(); + let (v, exit) = match interp.gen_fast_next(g, st.snap_gen, 0, st.maybe_dead) { + crate::gen_fast::GenNext::Yielded(v) => (v, false), + crate::gen_fast::GenNext::Exhausted(v) => (v, true), + crate::gen_fast::GenNext::Declined | crate::gen_fast::GenNext::Partial => { + return None; + } + }; + // The sent `None`'s slot (no drop glue owed). + st.stack.add(len - 1).write(v); + let to = pc as usize + 1 + if exit { arg as usize } else { 0 }; + // Anything the step released may have queued a finalizer, run + // before the next instruction: the core loop takes over there, + // synced as for a switch. + if (*st.maybe_dead).get() { + let sw = &mut *st.sw; + let frame = &mut *st.frame; + frame.stack.set_len(len); + frame.pc = to as u32; + *sw.last = pc as usize; + sw.pending = Some(crate::CoreExit::Stop(crate::LeafStop::Marked)); + return Some(RELOAD); + } + st.len = len; + Some(if exit { 0 } else { SEND_YIELDED }) + } +} + +/// `YIELD_VALUE` at `pc` of the running activation, an inline generator +/// resume (its stack `len` deep, the value on top), as the core loop's arm +/// runs it: the generator parks and its consumer, the value delivered, is +/// switched to (`RELOAD`); declined untouched for a generator's fast step, +/// a root activation (a draining consumer's fold is the arm's), or a yield +/// the switch doesn't take. +unsafe extern "C" fn h_gen_yield(st: *mut State, pc: u64, len: u64) -> u32 { + // SAFETY: the code passes its live state and its stack depth. + unsafe { + let st = &mut *st; + if st.sw.is_null() || (*(*st.sw).inl).is_empty() { + return 1; + } + let sw = &mut *st.sw; + let frame = &mut *st.frame; + frame.stack.set_len(len as usize); + frame.pc = pc as u32; + *sw.last = st.last; + let interp = &mut *st.interp.cast_mut(); + if !interp.core_gen_yield(sw, st.snap_gen) { + sw.pending = Some(crate::CoreExit::Stop(crate::LeafStop::Step)); + } else { + // A `yield from` chain passes the value straight up. + while sw.pending.is_none() + && interp.core_yield_chains(sw) + && interp.core_gen_yield(sw, st.snap_gen) + {} + } + RELOAD + } +} + +/// `RETURN_VALUE` at `pc` of the running activation, an inline generator +/// resume, as the core loop's arm runs it (see [`h_return`]); declined +/// untouched for a generator's fast step or a root activation. +unsafe extern "C" fn h_gen_return(st: *mut State, pc: u64, len: u64) -> u32 { + // SAFETY: the code passes its live state and its stack depth. unsafe { let st = &mut *st; - let sw = &mut *st.sw; - let Some(top) = (*sw.inl).last() else { - return 0; - }; - // A direct call's activation: its caller finishes the return. - if top.direct && std::ptr::eq(&raw const *top.frame, st.frame) { - st.len = len as usize; - st.pc = pc as usize; - return DIRECT_RET; + if st.sw.is_null() || (*(*st.sw).inl).is_empty() { + return 1; } + let sw = &mut *st.sw; let frame = &mut *st.frame; frame.stack.set_len(len as usize); frame.pc = pc as u32; @@ -3308,6 +6562,21 @@ unsafe extern "C" fn h_return(st: *mut State, pc: u64, len: u64) -> u32 { } } +/// `END_SEND` on the slots at `at` (the delegate) and above it (the +/// result): the result moves down over the delegate, which leaves by a +/// plain decrement (`0`); anything else declined untouched. +unsafe extern "C" fn h_end_send(at: *mut Object) -> u32 { + // SAFETY: the code passes two initialized slots atop its stack. + unsafe { + if !Interpreter::core_droppable(&*at) { + return 1; + } + let v = at.add(1).read(); + crate::drop_hot(std::mem::replace(&mut *at, v)); + 0 + } +} + /// `LOAD_DEREF i` of the running frame, as the core loop's arm runs it: /// `0` the cell's value written to the free slot `dst`, anything else /// declined untouched. @@ -3372,9 +6641,10 @@ unsafe extern "C" fn h_raise(st: *mut State, pc: u64, len: u64, n: u64) -> u32 { let cause = (n == 2).then(|| st.stack.add(len - 1).read()); let arg = st.stack.add(len - n).read(); let interp = &mut *st.interp.cast_mut(); - let globals = (*st.frame).globals.clone(); + // (The frame holds its globals for the raise.) + let globals = &(*st.frame).globals; let raised = interp - .instantiate_raised_class(arg, &globals) + .instantiate_raised_class(arg, globals) .and_then(|arg| Interpreter::normalize_exception(arg, cause)) .map(|mut exc| { interp.attach_implicit_context(&mut exc); @@ -3534,6 +6804,80 @@ unsafe extern "C" fn h_make_function(st: *mut State, at: *mut Object, flags: u64 } } +/// How many `SET_FUNCTION_ATTRIBUTE`s right after the bare `MAKE_FUNCTION` +/// at `pc` attach defaults (`0x01`) or a closure (`0x08`), each once: +/// the ones [`h_make_function_attrs`] builds the function with. +fn fused_function_attrs(code: &CodeObject, pc: usize) -> usize { + let ins = &code.instructions; + let mut seen = 0; + let mut k = 0; + while let Some(next) = ins.get(pc + 1 + k) { + let flag = next.arg; + if next.op != OpCode::SetFunctionAttribute + || !matches!(flag, 0x01 | 0x08) + || seen & flag != 0 + { + break; + } + seen |= flag; + k += 1; + } + k +} + +/// The bare `MAKE_FUNCTION` at `pc` of `code` with the `k` +/// `SET_FUNCTION_ATTRIBUTE`s after it (see [`fused_function_attrs`]), the +/// code object at stack slot `at + k` and the first attribute's value next +/// below it, as the core loop's arm runs them: `0` the function at `at` +/// with its defaults and closure (the operands consumed), anything else +/// declined untouched. +unsafe extern "C" fn h_make_function_attrs( + st: *mut State, + code: *const CodeObject, + pc: u64, + at: *mut Object, + k: u64, +) -> u32 { + // SAFETY: the code passes its live state, its own code, the fused run + // at `pc`, and its `k + 1` initialized operand slots. + unsafe { + let (code, pc, k) = (&*code, pc as usize, k as usize); + if crate::capi_watchers::funcs_active() || !matches!(&*at.add(k), Object::Code(_)) { + return 1; + } + let mut defaults = Vec::new(); + let mut closure = Vec::new(); + for j in 0..k { + let Object::Tuple(items) = &*at.add(k - 1 - j) else { + return 1; + }; + match code.instructions[pc + 1 + j].arg { + 0x01 => defaults = items.iter().cloned().collect(), + _ => closure = items.iter().cloned().collect(), + } + } + let Object::Code(fn_code) = at.add(k).read() else { + unreachable!("checked above") + }; + // (The tuples' items live on in the function.) + for j in 0..k { + drop(at.add(j).read()); + } + let frame = &*(*st).frame; + let f = crate::new_function( + fn_code, + &frame.globals, + &frame.builtins, + defaults, + Vec::new(), + closure, + None, + ); + at.write(f); + 0 + } +} + /// `SET_FUNCTION_ATTRIBUTE flag` of the value at stack slot `at` on the /// fresh function above it: `0` the function at `at`, `RAISED` its error /// (`st` synced past the instruction at `pc`), anything else declined @@ -3644,6 +6988,14 @@ unsafe impl Send for Engine {} static ENGINE: std::sync::Mutex>> = std::sync::Mutex::new(None); impl Engine { + /// Drop the function and builder contexts for empty ones: clearing + /// them keeps their buffers' capacity, the largest body's size, for + /// the rest of the process (and under the next compile's peak). + fn release(&mut self) { + self.ctx = self.module.make_context(); + self.fbctx = FunctionBuilderContext::new(); + } + fn new() -> Option { let tags = tags()?; let mut flags = settings::builder(); @@ -3735,13 +7087,16 @@ fn compile_with( let ninstrs = code.instructions.len(); // The attribute sites' field caches (allocated here if no read has // recorded one yet: the code addresses them). - let field_slots: &[FieldSlot] = ext - .field_slots - .get_or_init(|| (0..ninstrs).map(|_| FieldSlot::empty()).collect()); + let field_slots = ext.alloc_field_sites(code); let mut entries: Vec; let mut globals: Vec>; let mut slots: Vec>; + let mut methods: Vec>; let mut direct: Vec>; + let mut builtin_sites: Vec>; + let mut type_sites: Vec>; + let mut held: Vec>; + let mut mods: Vec>; let t0 = stats::enabled().then(std::time::Instant::now); // A body whose code comes out large is lowered again lean: compiling // costs about the same per IR instruction, and a large body's time @@ -3755,15 +7110,22 @@ fn compile_with( entries = (0..ninstrs).map(|pc| lower.enters_at(pc)).collect(); globals = std::mem::take(&mut lower.global_caches); slots = std::mem::take(&mut lower.slot_caches); + methods = std::mem::take(&mut lower.method_caches); direct = std::mem::take(&mut lower.direct_sites); + builtin_sites = std::mem::take(&mut lower.builtin_sites); + type_sites = std::mem::take(&mut lower.type_sites); + held = std::mem::take(&mut lower.held); + mods = std::mem::take(&mut lower.mod_caches); + // (Measured as if every exit's tail were in line, the size the + // threshold was tuned with.) + let size_in_line = lower.tail_savings; if done { lower.b.seal_all_blocks(); lower.b.finalize(); } - if done && !lean && engine.ctx.func.dfg.num_insts() > lean_above() { + if done && !lean && engine.ctx.func.dfg.num_insts() + size_in_line > lean_above() { lean = true; - engine.fbctx = FunctionBuilderContext::new(); - engine.module.clear_context(&mut engine.ctx); + engine.release(); engine.ctx.func.signature = signature.clone(); continue; } @@ -3771,8 +7133,7 @@ fn compile_with( }; if !built { // An unfinished function leaves the builder's state behind. - engine.fbctx = FunctionBuilderContext::new(); - engine.module.clear_context(&mut engine.ctx); + engine.release(); return None; } if std::env::var("WEAVEPY_FRAME_JIT_DUMP").is_ok_and(|n| code.qualname.contains(&n)) { @@ -3783,8 +7144,12 @@ fn compile_with( let blocks = engine.ctx.func.dfg.num_blocks(); let defined = engine.module.define_function(id, &mut engine.ctx); if let (Some(t0), Some(t1)) = (t0, t1) { + let bytes = engine + .ctx + .compiled_code() + .map_or(0, |c| c.code_buffer().len()); eprintln!( - "frame jit: {} lowered in {:?} ({insts} IR instructions, {blocks} blocks{}), compiled in {:?}", + "frame jit: {} lowered in {:?} ({insts} IR instructions, {blocks} blocks{}, {bytes} bytes), compiled in {:?}", code.qualname, t1 - t0, if lean { ", lean" } else { "" }, @@ -3797,7 +7162,7 @@ fn compile_with( code.qualname ); } - engine.module.clear_context(&mut engine.ctx); + engine.release(); defined.ok()?; engine.module.finalize_definitions().ok()?; let func = engine.module.get_finalized_function(id); @@ -3809,13 +7174,18 @@ fn compile_with( nlocals, fails: entries.iter().map(|_| AtomicU8::new(0)).collect(), entries: entries.into_iter().map(AtomicBool::new).collect(), - name: code.qualname.clone(), + name: code.qualname.to_string(), ops: code.instructions.iter().map(|i| i.op).collect(), depths: depths.into(), need: stack_need(depths), _globals: globals, _slots: slots, + _methods: methods, _direct: direct, + _builtin_sites: builtin_sites, + _type_sites: type_sites, + _held: held, + _mods: mods, }) } @@ -3880,7 +7250,7 @@ struct Lower<'a> { ext: &'a CodeConstObjects, nlocals: usize, depths: &'a [i64], - field_slots: &'a [FieldSlot], + field_slots: crate::Sites<'a, FieldSlot>, st: Value, locals: Value, stack: Value, @@ -3910,6 +7280,13 @@ struct Lower<'a> { /// Side exits waiting for their blocks to be filled (after the body: /// the builder fills one block at a time). side_exits: Vec, + /// The blocks that end the exits returning a status (see + /// [`Self::exit`]), by status and whether they store the last + /// instruction; filled after the side exits. + exit_tails: Vec<(u32, bool, Block)>, + /// The IR instructions the shared tails saved over writing each + /// exit's state and return in line. + tail_savings: usize, /// The `LOAD_GLOBAL` and `LOAD_ATTR` sites' caches, which the code /// addresses. #[allow(clippy::vec_box)] @@ -3917,10 +7294,26 @@ struct Lower<'a> { #[allow(clippy::vec_box)] slot_caches: Vec>, #[allow(clippy::vec_box)] + method_caches: Vec>, + #[allow(clippy::vec_box)] direct_sites: Vec>, + /// The `CALL` sites' settled builtins (see [`BuiltinSite`]). + #[allow(clippy::vec_box)] + builtin_sites: Vec>, + /// The `CALL` sites' settled builtin types (see [`TypeSite`]). + #[allow(clippy::vec_box)] + type_sites: Vec>, + /// The builtins the method kernels' calls address. + held: Vec>, + /// The method loads' module-attribute caches. + #[allow(clippy::vec_box)] + mod_caches: Vec>, /// The block a helper's raise goes to (see [`Self::leave`]), made on /// first use. catch: Option, + /// The block every [`Self::leave`] jumps to with its status, made on + /// first use. + leave_tail: Option, } /// An exit block of [`Lower::exit_with`], filled after the body from the @@ -3991,12 +7384,17 @@ fn native_op(op: OpCode) -> bool { | OpCode::ListToTuple | OpCode::UnpackEx | OpCode::LoadSuperAttr + | OpCode::LoadSpecial | OpCode::PushExcInfo | OpCode::CheckExcMatch | OpCode::PopExcept | OpCode::DeleteFast | OpCode::StoreSlice | OpCode::DeleteSubscr + | OpCode::GetAwaitable + | OpCode::GetYieldFromIter + | OpCode::Send + | OpCode::EndSend ) } @@ -4006,9 +7404,11 @@ fn native_at(code: &CodeObject, pc: usize) -> bool { let ins = code.instructions[pc]; match ins.op { OpCode::BuildTuple => (1..=3).contains(&ins.arg), - OpCode::BuildMap => (1..=8).contains(&ins.arg), + OpCode::BuildMap => (0..=8).contains(&ins.arg), OpCode::UnaryOp => ins.arg <= 3, OpCode::RaiseVarargs => matches!(ins.arg, 1 | 2), + // A prologue `MAKE_CELL`: the activation's cells are built with it. + OpCode::MakeCell => prologue_cell(code, pc), // (A slot shared with a cell saves the cell itself.) OpCode::LoadFastAndClear => { Interpreter::shared_cell_index(code, ins.arg as usize).is_none() @@ -4017,6 +7417,15 @@ fn native_at(code: &CodeObject, pc: usize) -> bool { } } +/// Whether the `MAKE_CELL` at `pc` is in the code's prologue, which every +/// activation's cells satisfy as they are built (the core loop runs it as +/// a no-op too); a later one is an inlined comprehension's fresh cell. +fn prologue_cell(code: &CodeObject, pc: usize) -> bool { + code.instructions[..pc] + .iter() + .all(|i| matches!(i.op, OpCode::MakeCell | OpCode::CopyFreeVars)) +} + impl<'a> Lower<'a> { #[allow(clippy::too_many_arguments)] fn new( @@ -4027,7 +7436,7 @@ impl<'a> Lower<'a> { ext: &'a CodeConstObjects, nlocals: usize, depths: &'a [i64], - field_slots: &'a [FieldSlot], + field_slots: crate::Sites<'a, FieldSlot>, ) -> Self { let entry = b.create_block(); b.append_block_params_for_function_params(entry); @@ -4073,10 +7482,18 @@ impl<'a> Lower<'a> { depth: 0, sigs: Vec::new(), side_exits: Vec::new(), + exit_tails: Vec::new(), + tail_savings: 0, global_caches: Vec::new(), slot_caches: Vec::new(), + method_caches: Vec::new(), direct_sites: Vec::new(), + builtin_sites: Vec::new(), + type_sites: Vec::new(), + held: Vec::new(), + mod_caches: Vec::new(), catch: None, + leave_tail: None, } } @@ -4264,19 +7681,22 @@ impl<'a> Lower<'a> { let by_value = self.b.create_block(); let by_clone = self.b.create_block(); let done = self.b.create_block(); - if self.tags.rc_counted == 0 { + if self.tags.rc_counted == 0 && self.tags.rc_counted_hdr == 0 { self.b.ins().brif(scalar, by_value, &[], by_clone, &[]); } else { - // An instance, list, dict or class while one thread owns every - // count: a plain increment of its count. + // An instance, list, dict, class, string or tuple while one + // thread owns every count: a plain increment of its count. let counted = self.b.create_block(); let heap = self.b.create_block(); self.b.ins().brif(scalar, by_value, &[], heap, &[]); self.b.switch_to_block(heap); let one = self.b.ins().iconst(types::I64, 1); let bit = self.b.ins().ishl(one, tag); - let rc = self.b.ins().band_imm(bit, self.tags.rc_counted); - let rc = self.b.ins().icmp_imm(IntCC::NotEqual, rc, 0); + let any = self + .b + .ins() + .band_imm(bit, self.tags.rc_counted | self.tags.rc_counted_hdr); + let rc = self.b.ins().icmp_imm(IntCC::NotEqual, any, 0); let flag = self.b.ins().iconst( self.ptr, std::ptr::from_ref(crate::sync::rc_shared_flag()) as i64, @@ -4286,10 +7706,10 @@ impl<'a> Lower<'a> { let ok = self.b.ins().band(rc, solo); self.b.ins().brif(ok, counted, &[], by_clone, &[]); self.b.switch_to_block(counted); - let w = self.b.ins().load(self.ptr, FLAGS, src, 8); - let c = self.b.ins().load(types::I64, FLAGS, w, 0); + let at = self.count_addr(src, bit); + let c = self.b.ins().load(types::I64, FLAGS, at, 0); let c1 = self.b.ins().iadd_imm(c, 1); - self.b.ins().store(FLAGS, c1, w, 0); + self.b.ins().store(FLAGS, c1, at, 0); self.b.ins().jump(by_value, &[]); } self.b.switch_to_block(by_value); @@ -4301,6 +7721,20 @@ impl<'a> Lower<'a> { self.b.switch_to_block(done); } + /// The strong count's address of the counted heap value at `src` + /// whose tag bit is `bit`: its payload word, or two words before it + /// for a [`Tags::rc_counted_hdr`] variant. + fn count_addr(&mut self, src: Value, bit: Value) -> Value { + let w = self.b.ins().load(self.ptr, FLAGS, src, 8); + if self.tags.rc_counted_hdr == 0 { + return w; + } + let hdr = self.b.ins().band_imm(bit, self.tags.rc_counted_hdr); + let hdr = self.b.ins().icmp_imm(IntCC::NotEqual, hdr, 0); + let before = self.b.ins().iadd_imm(w, -16); + self.b.ins().select(hdr, before, w) + } + /// Write the whole virtual stack to the frame's. fn flush(&mut self) { let base = self.depth - self.vs.len(); @@ -4325,17 +7759,63 @@ impl<'a> Lower<'a> { } /// Return `status` with the virtual stack written out and `pc` next. + /// The state's stores and the return are a tail block every exit with + /// the same status shares, which takes the depth, `pc` and the last + /// instruction as arguments: a body has hundreds of exits, and their + /// tails would otherwise be most of its IR. fn exit(&mut self, status: u32, pc: usize) { let cold = std::mem::replace(&mut self.cold, true); self.flush(); self.cold = cold; - let l = self.b.ins().iconst(types::I64, self.depth as i64); - self.b.ins().store(FLAGS, l, self.st, S_LEN); - self.store_last(); - let pcv = self.b.ins().iconst(types::I64, pc as i64); - self.b.ins().store(FLAGS, pcv, self.st, S_PC); - let s = self.b.ins().iconst(types::I32, i64::from(status)); - self.b.ins().return_(&[s]); + let last = self.last_pc; + let tail = match self + .exit_tails + .iter() + .find(|&&(s, l, _)| s == status && l == last.is_some()) + { + Some(&(_, _, tail)) => tail, + None => { + let tail = self.b.create_block(); + self.b.append_block_param(tail, types::I64); + self.exit_tails.push((status, last.is_some(), tail)); + tail + } + }; + // In line, the depth, pc, last instruction and status constants, + // the stores and the return, less the packed constant and the + // jump. + self.tail_savings += if last.is_some() { 6 } else { 4 }; + // The depth, pc and last instruction packed in one constant (see + // `EXIT_PC_SHIFT`): one value to the tail where three would each + // be an instruction and a block argument to allocate. + debug_assert!(self.depth < 1 << EXIT_PC_SHIFT); + debug_assert!(pc < 1 << (EXIT_LAST_SHIFT - EXIT_PC_SHIFT)); + let mut packed = self.depth as i64 | (pc as i64) << EXIT_PC_SHIFT; + if let Some(last) = last { + packed |= (last as i64) << EXIT_LAST_SHIFT; + } + let v = self.b.ins().iconst(types::I64, packed); + self.b.ins().jump(tail, &[v.into()]); + } + + /// Fill the exit tails (see [`Self::exit`]). + fn exit_tails(&mut self) { + for (status, last, tail) in std::mem::take(&mut self.exit_tails) { + self.b.switch_to_block(tail); + let packed = self.b.block_params(tail)[0]; + let field = (1 << (EXIT_LAST_SHIFT - EXIT_PC_SHIFT)) - 1; + let len = self.b.ins().band_imm(packed, (1 << EXIT_PC_SHIFT) - 1); + let pc = self.b.ins().ushr_imm(packed, EXIT_PC_SHIFT); + let pc = self.b.ins().band_imm(pc, field); + self.b.ins().store(FLAGS, len, self.st, S_LEN); + self.b.ins().store(FLAGS, pc, self.st, S_PC); + if last { + let last = self.b.ins().ushr_imm(packed, EXIT_LAST_SHIFT); + self.b.ins().store(FLAGS, last, self.st, S_LAST); + } + let s = self.b.ins().iconst(types::I32, i64::from(status)); + self.b.ins().return_(&[s]); + } } /// Leave for the core loop at `pc` (the instruction about to run), @@ -4358,6 +7838,24 @@ impl<'a> Lower<'a> { /// Return a helper's status `r` from the native code, a raise first /// trying the running activation's handlers (see [`h_catch`]). fn leave(&mut self, r: Value) { + // (One shared tail: a test, a branch and a return per helper call + // cost more compile memory than a jump.) + let tail = *self.leave_tail.get_or_insert_with(|| { + let tail = self.b.create_block(); + self.b.append_block_param(tail, types::I32); + tail + }); + self.b.ins().jump(tail, &[r.into()]); + } + + /// Fill the shared tail of [`Self::leave`]: a raise tries the running + /// activation's handlers, any other status returns. + fn leave_tail(&mut self) { + let Some(tail) = self.leave_tail else { + return; + }; + self.b.switch_to_block(tail); + let r = self.b.block_params(tail)[0]; let catch = *self.catch.get_or_insert_with(|| self.b.create_block()); let ret = self.b.create_block(); let raised = self.b.ins().icmp_imm(IntCC::Equal, r, i64::from(RAISED)); @@ -4369,6 +7867,7 @@ impl<'a> Lower<'a> { /// Fill the side exits' blocks, and the catch block: a raise its /// handler caught goes on through the dispatch (at the handler). fn side_exits(&mut self) { + self.leave_tail(); if let Some(catch) = self.catch { self.b.switch_to_block(catch); let r = self @@ -4389,6 +7888,7 @@ impl<'a> Lower<'a> { } self.exit(x.status, x.pc); } + self.exit_tails(); } /// Stop for a queued finalizer (with `pc` next), from the current @@ -4606,10 +8106,19 @@ impl<'a> Lower<'a> { OpCode::JumpBackward => Some(next.saturating_sub(ins.arg as usize)), _ => None, }; + // A `SEND`'s exit (`END_SEND`), where a delegate's return + // resumes the activation. + if ins.op == OpCode::Send && next + (ins.arg as usize) < n { + starts[next + ins.arg as usize] = true; + } if let Some(t) = target { if t < n { starts[t] = true; } + if fused_pair_at(code, pc) { + // Past the `UNPACK_SEQUENCE` a fused step skips. + starts[pc + 2] = true; + } if ins.op == OpCode::ForIter { // The loop exit past `END_FOR` / `POP_ITER`. let mut to = t; @@ -4637,6 +8146,23 @@ impl<'a> Lower<'a> { { starts[pc + 2] = true; } + // A function built with its defaults or closure continues after + // its last `SET_FUNCTION_ATTRIBUTE`. + if ins.op == OpCode::MakeFunction && ins.arg == 0 { + let k = fused_function_attrs(code, pc); + if k > 0 && pc + 1 + k < n { + starts[pc + 1 + k] = true; + } + } + // A forwarding call (`f(*args, **kwargs)`) continues after its + // `CALL_FUNCTION_EX`. + if ins.op == OpCode::BuildMap + && ins.arg == 0 + && crate::forward_call_shape(code, pc) + && pc + 4 < n + { + starts[pc + 4] = true; + } // A global's fused class-constant read continues after its // `LOAD_ATTR`. if ins.op == OpCode::LoadGlobal @@ -4765,6 +8291,7 @@ impl<'a> Lower<'a> { } let cont = match ins.op { OpCode::Nop | OpCode::NotTaken | OpCode::Resume | OpCode::CopyFreeVars => true, + OpCode::MakeCell if prologue_cell(self.code, pc) => true, OpCode::LoadFast | OpCode::LoadFastBorrow => self.load_fast(pc, ins.arg), OpCode::LoadConst if (ins.arg as usize) < self.ext.objects.len() => { self.push(Item::Const(ins.arg)); @@ -4784,7 +8311,8 @@ impl<'a> Lower<'a> { let scalar = self.is_scalar(tag); let heap = self.b.create_block(); let done = self.b.create_block(); - self.b.ins().brif(scalar, done, &[], heap, &[]); + // (A shared counted value by a plain decrement.) + self.release_or(scalar, at, tag, done, heap); self.b.switch_to_block(heap); let r = self .call(h_pop as *const () as usize, &[at], true) @@ -4941,9 +8469,22 @@ impl<'a> Lower<'a> { let g = self.b.ins().load(types::I64, FLAGS, gen_addr, 0); let snap = self.b.ins().load(types::I64, FLAGS, self.st, S_SNAP); let moved = self.b.ins().icmp(IntCC::NotEqual, g, snap); - let trip = self.b.ins().bor(low, moved); let out = self.exit_with(pc, &[], INTERP); - self.branch_out(trip, out); + self.branch_out(moved, out); + // A countdown that ran out with nobody waiting for the GIL + // starts over here (see `Interpreter::countdown_out`). + let refill = self.b.create_block(); + let go = self.b.create_block(); + self.b.append_block_param(go, types::I32); + self.b.set_cold_block(refill); + self.b.ins().brif(low, refill, &[], go, &[c.into()]); + self.b.switch_to_block(refill); + let n = self + .call(h_countdown as *const () as usize, &[countdown], true) + .expect("returns"); + self.b.ins().brif(n, go, &[n.into()], out, &[]); + self.b.switch_to_block(go); + let c = self.b.block_params(go)[0]; let c1 = self.b.ins().iadd_imm(c, -1); self.b.ins().store(FLAGS, c1, countdown, 0); self.set_last(pc); @@ -4952,12 +8493,16 @@ impl<'a> Lower<'a> { } OpCode::ForIter => return self.for_iter(pc, ins.arg), OpCode::BinarySubscr if self.seq_index(pc) => true, + OpCode::BinarySubscr if self.subscr_ref(pc) => true, + OpCode::UnpackSequence if self.unpack_ref(pc, ins.arg as usize) => true, + OpCode::StoreSubscr if self.store_subscr_ref(pc) => true, OpCode::BinarySubscr | OpCode::BinarySlice | OpCode::StoreSubscr | OpCode::UnpackSequence | OpCode::UnpackEx | OpCode::LoadSuperAttr + | OpCode::LoadSpecial | OpCode::PushExcInfo | OpCode::CheckExcMatch | OpCode::PopExcept @@ -5017,7 +8562,12 @@ impl<'a> Lower<'a> { return self.build(pc, ins.arg as usize, false) } OpCode::BuildList => return self.build(pc, ins.arg as usize, true), - OpCode::BuildMap if (1..=8).contains(&ins.arg) => { + OpCode::BuildMap + if ins.arg == 0 && !self.is_gen() && crate::forward_call_shape(self.code, pc) => + { + return self.call_forward(pc) + } + OpCode::BuildMap if (0..=8).contains(&ins.arg) => { return self.build_map(pc, ins.arg as usize) } // PEP 709: the local's value (`Unbound` included) moves onto @@ -5074,6 +8624,41 @@ impl<'a> Lower<'a> { self.check_released(pc + 1); true } + // A `def` or `lambda` with its defaults or closure: the + // function built with them at once. + OpCode::MakeFunction + if ins.arg == 0 + && fused_function_attrs(self.code, pc) > 0 + && self.depth > fused_function_attrs(self.code, pc) => + { + let k = fused_function_attrs(self.code, pc); + if self.blocks.get(pc + 1 + k).copied().flatten().is_none() { + self.exit(INTERP, pc); + return false; + } + self.flush(); + let s = self.depth - (k + 1); + let at = self.slot_addr(s); + let code = self.code_ptr(); + let pcv = self.b.ins().iconst(types::I64, pc as i64); + let kv = self.b.ins().iconst(types::I64, k as i64); + let r = self + .call( + h_make_function_attrs as *const () as usize, + &[self.st, code, pcv, at, kv], + true, + ) + .expect("returns"); + let out = self.exit_with(pc, &[], INTERP); + self.branch_out(r, out); + for _ in 0..=k { + self.pop(); + } + self.push(Item::Mem(s)); + self.set_last(pc + k); + self.goto(pc + 1 + k); + false + } OpCode::MakeFunction | OpCode::SetFunctionAttribute => { let n = if ins.op == OpCode::MakeFunction { 1 + (ins.arg & 0xf).count_ones() as usize @@ -5167,11 +8752,122 @@ impl<'a> Lower<'a> { // helper; a generator body's return isn't a switch.) OpCode::Call => return self.call_op(pc, ins.arg as usize), OpCode::CallKw => return self.call_kw(pc), + OpCode::CallEx => return self.call_ex(pc), + // `await`'s and `yield from`'s delegate, through `h_await_iter`. + OpCode::GetAwaitable | OpCode::GetYieldFromIter if self.depth > 0 => { + let s = self.top_to_mem(); + let at = self.slot_addr(s); + let k = self + .b + .ins() + .iconst(types::I64, i64::from(ins.op == OpCode::GetYieldFromIter)); + let r = self + .call(h_await_iter as *const () as usize, &[self.st, at, k], true) + .expect("returns"); + let out = self.exit_with(pc, &[], INTERP); + self.branch_out(r, out); + // (A replaced instance's release may queue a finalizer.) + self.set_last(pc); + self.check_released(pc + 1); + true + } + // The delegate resumes as the running activation (`h_send`): + // the block ends either way. + OpCode::Send if self.depth >= 2 => { + self.flush(); + self.store_last(); + let pcv = self.b.ins().iconst(types::I64, pc as i64); + let len = self.b.ins().iconst(types::I64, self.depth as i64); + let r = self + .call(h_send as *const () as usize, &[self.st, pcv, len], true) + .expect("returns"); + let out = self.exit_with(pc, &[], INTERP); + let switched = self.b.create_block(); + let other = self.b.create_block(); + let returned = self.b.create_block(); + let rest = self.b.create_block(); + let yielded = self.b.create_block(); + let reload = self.b.ins().icmp_imm(IntCC::Equal, r, i64::from(RELOAD)); + self.b.ins().brif(reload, switched, &[], other, &[]); + self.b.switch_to_block(switched); + self.b.ins().return_(&[r]); + self.b.switch_to_block(other); + // A delegate's fast step yielded: the value took the sent + // one's place, for this code's own `YIELD_VALUE`. + let is_yield = self + .b + .ins() + .icmp_imm(IntCC::Equal, r, i64::from(SEND_YIELDED)); + self.b.ins().brif(is_yield, yielded, &[], rest, &[]); + self.b.switch_to_block(yielded); + self.set_last(pc); + self.goto(next); + self.b.switch_to_block(rest); + self.b.ins().brif(r, out, &[], returned, &[]); + // The delegate returned into this `SEND`: its result took the + // sent value's place. + self.b.switch_to_block(returned); + self.set_last(pc); + self.goto(next + ins.arg as usize); + return false; + } + // A generator body's yield and return switch to its consumer + // (`h_gen_yield`, `h_gen_return`); in a fast step (no switch) + // they're the step's own. + OpCode::YieldValue | OpCode::ReturnValue if self.is_gen() && self.depth > 0 => { + self.flush(); + let sw = self.b.ins().load(self.ptr, FLAGS, self.st, S_SW); + let out = self.exit_with(pc, &[], INTERP); + let none = self.b.ins().icmp_imm(IntCC::Equal, sw, 0); + self.branch_out(none, out); + self.store_last(); + let pcv = self.b.ins().iconst(types::I64, pc as i64); + let len = self.b.ins().iconst(types::I64, self.depth as i64); + let helper = if ins.op == OpCode::YieldValue { + h_gen_yield as *const () as usize + } else { + h_gen_return as *const () as usize + }; + let r = self + .call(helper, &[self.st, pcv, len], true) + .expect("returns"); + let switched = self.b.create_block(); + let reload = self.b.ins().icmp_imm(IntCC::Equal, r, i64::from(RELOAD)); + self.b.ins().brif(reload, switched, &[], out, &[]); + self.b.switch_to_block(switched); + self.b.ins().return_(&[r]); + return false; + } + OpCode::EndSend if self.depth >= 2 => { + self.flush(); + let at = self.slot_addr(self.depth - 2); + let r = self + .call(h_end_send as *const () as usize, &[at], true) + .expect("returns"); + let out = self.exit_with(pc, &[], INTERP); + self.branch_out(r, out); + self.depth -= 1; + self.set_last(pc); + self.check_released(pc + 1); + true + } OpCode::ReturnValue if !self.is_gen() && self.depth > 0 => { self.flush(); self.store_last(); let pcv = self.b.ins().iconst(types::I64, pc as i64); let len = self.b.ins().iconst(types::I64, self.depth as i64); + // A direct call's callee hands its return to the caller as + // it stands (`h_return`'s `DIRECT_RET`, in line). + let direct = self.b.ins().uload8(types::I32, FLAGS, self.st, S_DIRECT); + let handed = self.b.create_block(); + let other = self.b.create_block(); + self.b.ins().brif(direct, handed, &[], other, &[]); + self.b.switch_to_block(handed); + self.b.ins().store(FLAGS, len, self.st, S_LEN); + self.b.ins().store(FLAGS, pcv, self.st, S_PC); + let r = self.b.ins().iconst(types::I32, i64::from(DIRECT_RET)); + self.b.ins().return_(&[r]); + self.b.switch_to_block(other); let r = self .call(h_return as *const () as usize, &[self.st, pcv, len], true) .expect("returns"); @@ -5220,8 +8916,11 @@ impl<'a> Lower<'a> { // here and leaves at the `CALL`. match self.code.instructions.get(pc + 1).map(|i| i.op) { Some(OpCode::LoadMethodAttr) - if !self.is_gen() && crate::method_site_in_place(self.ext, pc + 1) => + if !self.is_gen() + && crate::method_site_in_place(self.ext, pc + 1) + && !self.native_body_call(pc + 2) => { + self.method_kernel(pc); self.method_call(pc) } Some(OpCode::StoreAttr) => return self.store_attr(pc), @@ -5245,6 +8944,30 @@ impl<'a> Lower<'a> { true } + /// Whether the simple argument loads from `pc` end in a `CALL` whose + /// site settled on a builtin body the core loop's lane runs: the fused + /// method call (`h_local_method`) runs leaf calls only, so the method + /// loads and its call runs through [`h_call_native`]. + fn native_body_call(&self, pc: usize) -> bool { + let ins = &self.code.instructions; + let mut n = 0; + for (k, i) in ins.iter().enumerate().skip(pc).take(16) { + match i.op { + OpCode::LoadFast + | OpCode::LoadFastBorrow + | OpCode::LoadConst + | OpCode::LoadSmallInt + | OpCode::BinaryOp => n += 1, + OpCode::Call => { + return n >= i.arg as usize + && matches!(crate::call_site_builtin(self.ext, k), Some((_, None, _))); + } + _ => return false, + } + } + false + } + /// Whether the code is a generator's, coroutine's or async generator's /// body: its resume can't raise from here (its calls are the general /// loop's). @@ -5252,6 +8975,118 @@ impl<'a> Lower<'a> { self.code.is_generator || self.code.is_coroutine || self.code.is_async_generator } + /// `LOAD_FAST x; x.m(); CALL` on an exact `list`, `dict`, `set` or `str` whose + /// method the site settled as a leaf with a [`Kernel`]: the receiver's + /// tag checked in line and the kernel called on the operands in place + /// (no method object, receiver copy or argument copies), continuing + /// after the `CALL`. Lowering continues (at the general fused call) + /// where the receiver is something else or the kernel declines; + /// nothing is emitted for a site without a kernel. + fn method_kernel(&mut self, pc: usize) { + #[derive(Clone, Copy)] + enum Arg { + Local(u32), + Const(u32), + Small(u32), + } + let code = self.code; + let ins = &code.instructions; + let n = ins.len(); + let mut args: Vec = Vec::new(); + let mut k = pc + 2; + let call_pc = loop { + let Some(i) = ins.get(k) else { + return; + }; + match i.op { + OpCode::LoadFast | OpCode::LoadFastBorrow if (i.arg as usize) < self.nlocals => { + args.push(Arg::Local(i.arg)); + } + OpCode::LoadConst if (i.arg as usize) < self.ext.objects.len() => { + args.push(Arg::Const(i.arg)); + } + OpCode::LoadSmallInt => args.push(Arg::Small(i.arg)), + OpCode::Call if i.arg as usize == args.len() => break k, + _ => return, + } + if args.len() > 2 { + return; + } + k += 1; + }; + if call_pc + 1 >= n || self.blocks.get(call_pc + 1).copied().flatten().is_none() { + return; + } + let Some((tag, kind, f)) = crate::builtin_method_site(self.ext, pc + 1, call_pc) else { + return; + }; + let Some(kernel) = kernel_for(tag, kind, args.len()) else { + return; + }; + let want = match tag { + 1 => self.tags.list, + 2 => self.tags.dict, + 3 => self.tags.set, + _ => self.tags.str, + }; + self.flush(); + let slot = self.depth; + let declined = self.b.create_block(); + let recv = self.local_addr(self.code.instructions[pc].arg); + let t = self.tag_at(recv); + let other = self.b.ins().icmp_imm(IntCC::NotEqual, t, i64::from(want)); + self.branch_out(other, declined); + let mut addrs = Vec::with_capacity(2); + for (j, arg) in args.iter().enumerate() { + let at = match *arg { + Arg::Local(i) => { + let at = self.local_addr(i); + if self.maybe_unbound[i as usize] && !self.bound[i as usize] { + let t = self.tag_at(at); + let unbound = + self.b + .ins() + .icmp_imm(IntCC::Equal, t, i64::from(self.tags.unbound)); + self.branch_out(unbound, declined); + } + at + } + Arg::Const(c) => self.const_addr(c), + // A scalar in the slot the argument would take. + Arg::Small(v) => { + let at = self.slot_addr(slot + 2 + j); + self.write_tag(at, self.tags.int); + let v = self.b.ins().iconst(types::I64, i64::from(v)); + self.b.ins().store(FLAGS, v, at, 8); + at + } + }; + addrs.push(at); + } + let null = self.b.ins().iconst(self.ptr, 0); + let a = addrs.first().copied().unwrap_or(null); + let b = addrs.get(1).copied().unwrap_or(null); + let fp = self.b.ins().iconst(self.ptr, Rc::as_ptr(&f) as i64); + self.held.push(f); + let out = self.slot_addr(slot); + let r = self + .call(kernel as *const () as usize, &[out, recv, a, b, fp], true) + .expect("returns"); + let ran = self.b.create_block(); + self.b.ins().brif(r, declined, &[], ran, &[]); + // Ran: the result in the receiver's slot, as after the `CALL`. + self.b.switch_to_block(ran); + let (depth, last) = (self.depth, self.last_pc); + self.push(Item::Mem(slot)); + self.set_last(call_pc); + self.goto(call_pc + 1); + self.depth = depth; + self.last_pc = last; + self.vs.clear(); + self.b.switch_to_block(declined); + } + /// `LOAD_FAST x; x.m()` through [`h_local_method`], /// continuing at whatever follows the call (through the dispatch). /// Lowering continues where the helper declines (the plain load). @@ -5459,7 +9294,7 @@ impl<'a> Lower<'a> { /// a plain decrement (one thread owns every count, and no watcher or /// tracer wants the release). Anything else goes to `slow`. fn release_or(&mut self, plain: Value, local: Value, old: Value, fast: Block, slow: Block) { - if self.cold || self.tags.rc_counted == 0 { + if self.cold || (self.tags.rc_counted == 0 && self.tags.rc_counted_hdr == 0) { self.b.ins().brif(plain, fast, &[], slow, &[]); return; } @@ -5470,19 +9305,22 @@ impl<'a> Lower<'a> { self.b.switch_to_block(heap); let one = self.b.ins().iconst(types::I64, 1); let bit = self.b.ins().ishl(one, old); - let rc = self.b.ins().band_imm(bit, self.tags.rc_counted); + let rc = self + .b + .ins() + .band_imm(bit, self.tags.rc_counted | self.tags.rc_counted_hdr); let rc = self.b.ins().icmp_imm(IntCC::NotEqual, rc, 0); // The single-thread bias, and the release observers, all off. - let mut quiet = rc; - for flag in crate::plain_release_flags() { - let addr = self.b.ins().iconst(self.ptr, flag as i64); - let on = self.b.ins().load(types::I8, FLAGS, addr, 0); - let off = self.b.ins().icmp_imm(IntCC::Equal, on, 0); - quiet = self.b.ins().band(quiet, off); - } + let addr = self + .b + .ins() + .iconst(self.ptr, crate::plain_release_gate() as i64); + let on = self.b.ins().load(types::I32, FLAGS, addr, 0); + let off = self.b.ins().icmp_imm(IntCC::Equal, on, 0); + let quiet = self.b.ins().band(rc, off); self.b.ins().brif(quiet, counted, &[], slow, &[]); self.b.switch_to_block(counted); - let w = self.b.ins().load(self.ptr, FLAGS, local, 8); + let w = self.count_addr(local, bit); let c = self.b.ins().load(types::I64, FLAGS, w, 0); let shared = self.b.ins().icmp_imm(IntCC::UnsignedGreaterThan, c, 1); self.b.ins().brif(shared, dec, &[], slow, &[]); @@ -5812,7 +9650,11 @@ impl<'a> Lower<'a> { /// raise or switch, which leaves the whole stack on the frame's: only /// a stack with nothing virtual below the operands tries it. fn binop_declined(&mut self, pc: usize, slot: usize, r: Value, out: Block, ok: Block) { - if !self.vs.iter().all(|i| matches!(i, Item::Mem(_))) { + // (A lean body tries the method only at a site that has run on + // instances: elsewhere the core loop runs it.) + if !self.vs.iter().all(|i| matches!(i, Item::Mem(_))) + || (self.cold && !crate::instance_site(self.ext, pc)) + { self.b.ins().brif(r, out, &[], ok, &[]); return; } @@ -5963,8 +9805,8 @@ impl<'a> Lower<'a> { /// `local[i]` of a list or tuple local and an `int` index, in line: /// the item is read in place (the local gives no reference to take or /// release) and copied to the stack. Any other operands (a `str` or a - /// dict, a borrowed list, an index out of range) take the container - /// helper, as [`Self::container`] would. `false`, emitting nothing, for + /// dict, a borrowed list, an index out of range) take the in-place + /// helper, as [`Self::subscr_ref`] does. `false`, emitting nothing, for /// other operand shapes. fn seq_index(&mut self, pc: usize) -> bool { let (Some(list), Some((tlen, titems))) = (self.tags.list_layout, self.tags.tuple_layout) @@ -6054,33 +9896,71 @@ impl<'a> Lower<'a> { let dst = self.slot_addr(slot); self.copy_value(dst, item); self.b.ins().jump(join, &[]); - // Anything else: both operands to the stack, and the helper. + // Anything else (a dict, a string, a borrowed list, an index out of + // range) through the in-place helper, which reads the local + // container where it lies (see `Self::subscr_ref`). self.b.switch_to_block(slow); - self.materialize(cont, slot); - self.materialize(key, slot + 1); + let (pcont, own_c) = self.ref_or_own(cont, slot); + let (pkey, own_k) = self.ref_or_own(key, slot + 1); + let owned = u8::from(own_c) | (u8::from(own_k) << 1); + self.ref_call( + pc, + h_subscr_ref as *const () as usize, + slot, + 2, + &[pcont, pkey], + owned, + ); + // (The helper released the operands; a finalizer it queued runs + // before the next instruction, as after `Self::container`.) + self.depth = slot + 1; + self.set_last(pc); + self.check_released(pc + 1); + self.depth = slot; + self.b.ins().jump(join, &[]); + self.b.switch_to_block(join); + self.push(Item::Mem(slot)); + self.set_last(pc); + true + } + + /// A container instruction through one of the in-place helpers + /// ([`h_subscr_ref`], [`h_unpack_ref`], [`h_store_subscr_ref`]), its + /// `n` operands from `slot` up (the owned ones there, by the bits of + /// `owned`; `ops` their addresses and any further arguments): the + /// helper's new depth, a decline leaving for the core loop with the + /// operands on the stack, a raise (only with nothing virtual below + /// the operands) taking the handlers. + fn ref_call( + &mut self, + pc: usize, + helper: usize, + slot: usize, + n: usize, + ops: &[Value], + owned: u8, + ) { let ins = self.b.ins().iconst( self.ptr, std::ptr::from_ref(&self.code.instructions[pc]) as i64, ); - let code = self - .b - .ins() - .iconst(self.ptr, std::ptr::from_ref(self.code) as i64); + let code = self.code_ptr(); let pcv = self.b.ins().iconst(types::I64, pc as i64); - let lenv = self.b.ins().iconst(types::I64, slot as i64 + 2); - // (A raise needs the whole stack on the frame's: nothing virtual - // below the operands.) + let lenv = self.b.ins().iconst(types::I64, (slot + n) as i64); let raisable = self.vs.iter().all(|i| matches!(i, Item::Mem(_))); - let can_raise = self.b.ins().iconst(types::I64, i64::from(raisable)); + let flags = self + .b + .ins() + .iconst(types::I64, i64::from(owned) | (i64::from(raisable) << 8)); + let mut args = vec![self.st, ins, code, pcv, lenv]; + args.extend_from_slice(ops); + args.push(flags); let r = self - .call_typed( - h_container as *const () as usize, - &[self.st, ins, code, pcv, lenv, can_raise], - Some(types::I64), - ) + .call_typed(helper, &args, Some(types::I64)) .expect("returns"); let declined = self.b.ins().icmp_imm(IntCC::Equal, r, -1); - let out = self.exit_with(pc, &[Item::Mem(slot), Item::Mem(slot + 1)], INTERP); + let restore: Vec = (slot..slot + n).map(Item::Mem).collect(); + let out = self.exit_with(pc, &restore, INTERP); self.branch_out(declined, out); if raisable { let raised = self.b.ins().icmp_imm(IntCC::Equal, r, -2); @@ -6092,16 +9972,90 @@ impl<'a> Lower<'a> { self.leave(s); self.b.switch_to_block(ok); } - // (The helper released the operands; a finalizer it queued runs - // before the next instruction, as after `Self::container`.) - self.depth = slot + 1; + } + + /// `BINARY_SUBSCR` through [`h_subscr_ref`], which reads a local's or + /// constant's operand in place (no reference taken or released): the + /// item in the container's slot. `false`, emitting nothing, where the + /// depth after isn't known. + fn subscr_ref(&mut self, pc: usize) -> bool { + if self.depth < 2 || self.depths.get(pc + 1).copied().unwrap_or(-1) < 0 { + return false; + } + let key = self.pop(); + let cont = self.pop(); + let slot = self.depth; + let (pcont, own_c) = self.ref_or_own(cont, slot); + let (pkey, own_k) = self.ref_or_own(key, slot + 1); + let owned = u8::from(own_c) | (u8::from(own_k) << 1); + self.ref_call( + pc, + h_subscr_ref as *const () as usize, + slot, + 2, + &[pcont, pkey], + owned, + ); + self.push(Item::Mem(slot)); + self.set_last(pc); + // (The helper released the owned operands; a finalizer that queued + // runs before the next instruction.) + self.check_released(pc + 1); + true + } + + /// `UNPACK_SEQUENCE n` through [`h_unpack_ref`], which reads a local's + /// or constant's sequence in place. `false`, emitting nothing, where + /// the depth after isn't known. + fn unpack_ref(&mut self, pc: usize, n: usize) -> bool { + if n == 0 || self.depth == 0 || self.depths.get(pc + 1).copied().unwrap_or(-1) < 0 { + return false; + } + let item = self.pop(); + let slot = self.depth; + let (src, owned) = self.ref_or_own(item, slot); + let nv = self.b.ins().iconst(types::I64, n as i64); + self.ref_call( + pc, + h_unpack_ref as *const () as usize, + slot, + 1, + &[src, nv], + u8::from(owned), + ); + for k in 0..n { + self.push(Item::Mem(slot + k)); + } self.set_last(pc); self.check_released(pc + 1); - self.depth = slot; - self.b.ins().jump(join, &[]); - self.b.switch_to_block(join); - self.push(Item::Mem(slot)); + true + } + + /// `STORE_SUBSCR` through [`h_store_subscr_ref`], which reads a local's + /// or constant's operand in place. `false`, emitting nothing, where + /// the depth after isn't known. + fn store_subscr_ref(&mut self, pc: usize) -> bool { + if self.depth < 3 || self.depths.get(pc + 1).copied().unwrap_or(-1) < 0 { + return false; + } + let key = self.pop(); + let cont = self.pop(); + let val = self.pop(); + let slot = self.depth; + let (pv, own_v) = self.ref_or_own(val, slot); + let (pcont, own_c) = self.ref_or_own(cont, slot + 1); + let (pkey, own_k) = self.ref_or_own(key, slot + 2); + let owned = u8::from(own_v) | (u8::from(own_c) << 1) | (u8::from(own_k) << 2); + self.ref_call( + pc, + h_store_subscr_ref as *const () as usize, + slot, + 3, + &[pv, pcont, pkey], + owned, + ); self.set_last(pc); + self.check_released(pc + 1); true } @@ -6121,16 +10075,40 @@ impl<'a> Lower<'a> { true } - /// `CONTAINS_OP` through [`h_contains`]: an unboxed `bool`. + /// An operand for a helper that reads it in place: a local's or a + /// constant's own value (borrowed, `false`), or anything else on the + /// stack at `slot` (owned there, `true`). + fn ref_or_own(&mut self, item: Item, slot: usize) -> (Value, bool) { + match item { + Item::Local(i) => (self.local_addr(i), false), + Item::Const(k) => (self.const_addr(k), false), + other => { + self.materialize(other, slot); + (self.slot_addr(slot), true) + } + } + } + + /// `CONTAINS_OP` through [`h_contains_ref`], which reads a local or + /// constant operand in place (any other through [`h_contains`]): an + /// unboxed `bool`. fn contains(&mut self, pc: usize, arg: u32) -> bool { let bi = self.pop(); let ai = self.pop(); let slot = self.depth; - self.materialize(ai, slot); - self.materialize(bi, slot + 1); + let (pa, own_a) = self.ref_or_own(ai, slot); + let (pb, own_b) = self.ref_or_own(bi, slot + 1); + let owned = self.b.ins().iconst( + types::I32, + i64::from(u8::from(own_a) | (u8::from(own_b) << 1)), + ); let at = self.slot_addr(slot); let r = self - .call(h_contains as *const () as usize, &[at], true) + .call( + h_contains_ref as *const () as usize, + &[pa, pb, owned, at], + true, + ) .expect("returns"); let declined = self.b.ins().icmp_imm(IntCC::UnsignedGreaterThan, r, 1); let out = self.exit_with(pc, &[Item::Mem(slot), Item::Mem(slot + 1)], INTERP); @@ -6518,6 +10496,24 @@ impl<'a> Lower<'a> { let it_slot = self.depth - 1; let it = self.slot_addr(it_slot); let out_slot = self.slot_addr(self.depth); + // A loop that unpacks a pair (`for k, v in d.items()`): the pair + // straight onto the stack, past the `UNPACK_SEQUENCE`, when the + // step allows; any other step below. + if fused_pair_at(self.code, pc) { + let r = self + .call(h_for_iter_pair as *const () as usize, &[it, out_slot], true) + .expect("returns"); + let pair_b = self.b.create_block(); + let single = self.b.create_block(); + self.b.ins().brif(r, single, &[], pair_b, &[]); + self.b.switch_to_block(pair_b); + let depth = self.depth; + self.depth += 2; + self.set_last(pc + 1); + self.goto(pc + 2); + self.depth = depth; + self.b.switch_to_block(single); + } let pcv = self.b.ins().iconst(types::I64, pc as i64); let r = self .call( @@ -6598,6 +10594,50 @@ impl<'a> Lower<'a> { /// [`h_local_attr`] / [`h_stack_attr`]. The value goes onto the stack /// (a scalar copied, anything else with a reference taken); a stack /// receiver is released after. A miss is the core loop's. + /// An in-line attribute read's value at `v` into the free slot `dst` + /// (stack slot `slot`) in place of the receiver `item`, then on to + /// `done`: a local receiver stays, a stack receiver is released first + /// (a declined release leaves through `exit`). + fn attr_value_out( + &mut self, + item: Item, + dst: Value, + slot: usize, + v: Value, + exit: Block, + done: Block, + ) { + match item { + // The receiver is the local's: the value just takes a copy. + Item::Local(_) => { + self.copy_value(dst, v); + self.b.ins().jump(done, &[]); + } + _ => { + // The receiver is the stack's: the value goes above it + // (copied) until the receiver is released, then down. + let above = self.slot_addr(slot + 1); + self.copy_value(above, v); + let r = self + .call(h_pop as *const () as usize, &[dst], true) + .expect("returns"); + let undo = self.b.create_block(); + let released = self.b.create_block(); + self.b.ins().brif(r, undo, &[], released, &[]); + // Declined: the copy goes, and the core loop takes the + // instruction from the start. + self.b.switch_to_block(undo); + // (A fresh copy has another owner: its release is a plain + // decrement.) + self.call(h_pop as *const () as usize, &[above], true); + self.b.ins().jump(exit, &[]); + self.b.switch_to_block(released); + self.copy16(dst, above); + self.b.ins().jump(done, &[]); + } + } + } + fn load_attr(&mut self, pc: usize, _arg: u32) -> bool { // A property's getter may run here (see `h_property`), which needs // the whole stack on the frame's. @@ -6619,8 +10659,41 @@ impl<'a> Lower<'a> { let dst = self.slot_addr(slot); let miss = self.b.create_block(); let done = self.b.create_block(); + let cache: Box = Box::default(); + let cache_at = std::ptr::from_ref::(&cache) as i64; + self.slot_caches.push(cache); + let module_site = matches!( + self.code.caches.get(pc as u32), + weavepy_compiler::InlineCache::LoadAttrModule { .. } + ); // (A site with no field shortcut yet goes straight to the helper.) match (self.layout, self.field_slots.get(pc)) { + // A module attribute (CPython's `LOAD_ATTR_MODULE`): the value + // the site's helper last read, while the module's dict is + // exactly as it was then (its stamp moves with every key + // change; a value stored in place stays at its address). + _ if module_site && self.tags.module_layout.is_some() => { + let (handle_at, data_at) = self.tags.module_layout.expect("checked"); + let ptr = self.ptr; + let otag = self.tag_at(at); + let not_mod = + self.b + .ins() + .icmp_imm(IntCC::NotEqual, otag, i64::from(self.tags.module)); + self.branch_out(not_mod, miss); + let m = self.b.ins().load(ptr, FLAGS, at, 8); + let handle = self.b.ins().load(ptr, FLAGS, m, handle_at); + let stamp = self + .b + .ins() + .load(types::I64, FLAGS, handle, data_at + DICT_STAMP); + let c = self.b.ins().iconst(ptr, cache_at); + let want = self.b.ins().load(types::I64, FLAGS, c, SC_MSTAMP); + let stale = self.b.ins().icmp(IntCC::NotEqual, stamp, want); + self.branch_out(stale, miss); + let v = self.b.ins().load(ptr, FLAGS, c, SC_MVALUE); + self.attr_value_out(item, dst, slot, v, exit, done); + } (Some(l), Some(cache_slot)) if cache_slot.get().0 != 0 => { let l = *l; let otag = self.tag_at(at); @@ -6642,82 +10715,124 @@ impl<'a> Lower<'a> { .iconst(ptr, std::ptr::from_ref(cache_slot).cast::() as i64); let want = self.b.ins().load(types::I64, FLAGS, cache, FIELD_VER); let idx = self.b.ins().uload32(FLAGS, cache, FIELD_IDX); - let lazy = self.b.ins().load(ptr, FLAGS, inst, l.inst_dict_lazy); let flag = self.b.ins().iconst(ptr, l.cells_unguarded as i64); let shared = self.b.ins().uload8(types::I64, FLAGS, flag, 0); - let borrow = self.b.ins().sload32(FLAGS, inst, l.inst_split_borrow); - let block = self.b.ins().load(ptr, FLAGS, inst, l.inst_split_block); let unset = self.b.ins().icmp_imm(IntCC::Equal, want, 0); let stale = self.b.ins().icmp(IntCC::NotEqual, ver, want); - let busy = self.b.ins().icmp_imm(IntCC::SignedLessThan, borrow, 0); - let empty = self.b.ins().icmp_imm(IntCC::Equal, block, 0); - let other = self.b.ins().bor(lazy, shared); - let other = self.b.ins().icmp_imm(IntCC::NotEqual, other, 0); - let bad = self.b.ins().bor(unset, stale); - let bad = self.b.ins().bor(bad, busy); - let bad = self.b.ins().bor(bad, empty); - let bad = self.b.ins().bor(bad, other); - self.branch_out(bad, miss); - let keys = self.b.ins().load(ptr, FLAGS, block, l.split_keys); - let ckeys = self.b.ins().load(ptr, FLAGS, cls, l.type_shared_keys); - let len = self.b.ins().uload32(FLAGS, block, l.split_len); - let foreign = self.b.ins().icmp(IntCC::NotEqual, keys, ckeys); - let absent = self - .b - .ins() - .icmp(IntCC::UnsignedGreaterThanOrEqual, idx, len); - let bad = self.b.ins().bor(foreign, absent); - self.branch_out(bad, miss); - let off = self.b.ins().ishl_imm(idx, 4); - let v = self.b.ins().iadd(block, off); - let v = self.b.ins().iadd_imm(v, i64::from(l.split_values)); - match item { - // The receiver is the local's: the value just takes a - // copy. - Item::Local(_) => { - self.copy_value(dst, v); - self.b.ins().jump(done, &[]); - } - _ => { - // The receiver is the stack's: the value goes above - // it (copied) until the receiver is released, then - // down. - let above = self.slot_addr(slot + 1); - self.copy_value(above, v); - let r = self - .call(h_pop as *const () as usize, &[dst], true) - .expect("returns"); - let undo = self.b.create_block(); - let released = self.b.create_block(); - self.b.ins().brif(r, undo, &[], released, &[]); - // Declined: the copy goes, and the core loop takes - // the instruction from the start. - self.b.switch_to_block(undo); - // (A fresh copy has another owner: its release is a - // plain decrement.) - self.call(h_pop as *const () as usize, &[above], true); - self.b.ins().jump(exit, &[]); - self.b.switch_to_block(released); - self.copy16(dst, above); - self.b.ins().jump(done, &[]); - } - } + let v = if cache_slot.get().1 & crate::SLOT_FIELD != 0 && l.slots_ok { + // A `__slots__` member laid out over the class's own + // layout, at the site's position, and set (see + // `PyInstance::laid_out_slot`). + let split = self.b.ins().band_imm(idx, i64::from(crate::SLOT_FIELD)); + let split = self.b.ins().icmp_imm(IntCC::Equal, split, 0); + let shared = self.b.ins().icmp_imm(IntCC::NotEqual, shared, 0); + let bad = self.b.ins().bor(unset, stale); + let bad = self.b.ins().bor(bad, split); + let bad = self.b.ins().bor(bad, shared); + self.branch_out(bad, miss); + let clayout = self.b.ins().load(ptr, FLAGS, cls, type_slot_layout(&l)); + let borrow = self.b.ins().sload32(FLAGS, inst, l.inst_slots_borrow); + let form = self + .b + .ins() + .uload8(types::I32, FLAGS, inst, l.inst_slots_tag); + let names = self.b.ins().load(ptr, FLAGS, inst, l.inst_slots_layout); + let vals = self.b.ins().load(ptr, FLAGS, inst, l.inst_slots_values); + let busy = self.b.ins().icmp_imm(IntCC::SignedLessThan, borrow, 0); + let other = + self.b + .ins() + .icmp_imm(IntCC::NotEqual, form, i64::from(l.slots_laid_out)); + let foreign = self.b.ins().icmp(IntCC::NotEqual, names, clayout); + let bad = self.b.ins().bor(busy, other); + let bad = self.b.ins().bor(bad, foreign); + self.branch_out(bad, miss); + let i = self.b.ins().band_imm(idx, i64::from(!crate::SLOT_FIELD)); + let off = self.b.ins().ishl_imm(i, 4); + let v = self.b.ins().iadd(vals, off); + let vt = self.b.ins().uload8(types::I32, FLAGS, v, 0); + let none = self + .b + .ins() + .icmp_imm(IntCC::Equal, vt, i64::from(l.tag_unbound)); + self.branch_out(none, miss); + v + } else { + let lazy = self.b.ins().load(ptr, FLAGS, inst, l.inst_dict_lazy); + let borrow = self.b.ins().sload32(FLAGS, inst, l.inst_split_borrow); + let block = self.b.ins().load(ptr, FLAGS, inst, l.inst_split_block); + let busy = self.b.ins().icmp_imm(IntCC::SignedLessThan, borrow, 0); + let empty = self.b.ins().icmp_imm(IntCC::Equal, block, 0); + let other = self.b.ins().bor(lazy, shared); + let other = self.b.ins().icmp_imm(IntCC::NotEqual, other, 0); + let bad = self.b.ins().bor(unset, stale); + let bad = self.b.ins().bor(bad, busy); + let bad = self.b.ins().bor(bad, empty); + let bad = self.b.ins().bor(bad, other); + self.branch_out(bad, miss); + let keys = self.b.ins().load(ptr, FLAGS, block, l.split_keys); + let ckeys = self.b.ins().load(ptr, FLAGS, cls, l.type_shared_keys); + let len = self.b.ins().uload32(FLAGS, block, l.split_len); + let foreign = self.b.ins().icmp(IntCC::NotEqual, keys, ckeys); + let absent = self + .b + .ins() + .icmp(IntCC::UnsignedGreaterThanOrEqual, idx, len); + let bad = self.b.ins().bor(foreign, absent); + self.branch_out(bad, miss); + let off = self.b.ins().ishl_imm(idx, 4); + let v = self.b.ins().iadd(block, off); + self.b.ins().iadd_imm(v, i64::from(l.split_values)) + }; + self.attr_value_out(item, dst, slot, v, exit, done); } _ => { self.b.ins().jump(miss, &[]); } } - // The core loop's cached reads. self.b.switch_to_block(miss); + let pcv = self.b.ins().iconst(types::I64, pc as i64); + // A property site: the getter the site cached for the receiver's + // class first, ahead of the cached reads that would all decline + // (CPython's `LOAD_ATTR_PROPERTY`). + let all_mem = self.vs.iter().all(|i| matches!(i, Item::Mem(_))); + let site_at = all_mem.then(|| { + let site: Box = Box::default(); + let at = std::ptr::from_ref::(&site) as i64; + self.direct_sites.push(site); + at + }); + if let (Some(site_at), true) = (site_at, crate::property_site(self.ext, pc)) { + let code = self.code_ptr(); + let slotv = self.b.ins().iconst(types::I64, slot as i64); + let flags = PROPERTY_ONLY | u64::from(matches!(item, Item::Local(_))); + let local = self.b.ins().iconst(types::I64, flags as i64); + let site = self.b.ins().iconst(self.ptr, site_at); + let r = self + .call( + h_property as *const () as usize, + &[self.st, code, pcv, slotv, at, local, site], + true, + ) + .expect("returns"); + let other = self.b.create_block(); + let reads = self.b.create_block(); + let leave = self.b.create_block(); + self.b.ins().brif(r, other, &[], done, &[]); + self.b.switch_to_block(other); + let declined = self + .b + .ins() + .icmp_imm(IntCC::Equal, r, i64::from(CALL_DECLINED)); + self.b.ins().brif(declined, reads, &[], leave, &[]); + self.b.switch_to_block(leave); + self.leave(r); + self.b.switch_to_block(reads); + } + // The core loop's cached reads. let code = self.code_ptr(); let ext = self.ext_ptr(); - let pcv = self.b.ins().iconst(types::I64, pc as i64); - let cache: Box = Box::default(); - let c = self - .b - .ins() - .iconst(self.ptr, std::ptr::from_ref::(&cache) as i64); - self.slot_caches.push(cache); + let c = self.b.ins().iconst(self.ptr, cache_at); let r = match item { Item::Local(_) => self.call( h_local_attr as *const () as usize, @@ -6733,16 +10848,11 @@ impl<'a> Lower<'a> { .expect("returns"); // A property whose getter the site has cached runs directly, when // nothing virtual lies below (its call can raise or switch). - if self.vs.iter().all(|i| matches!(i, Item::Mem(_))) { + if let Some(site_at) = site_at { let prop = self.b.create_block(); self.b.ins().brif(r, prop, &[], done, &[]); self.b.switch_to_block(prop); - let site: Box = Box::default(); - let site_at = self - .b - .ins() - .iconst(self.ptr, std::ptr::from_ref::(&site) as i64); - self.direct_sites.push(site); + let site_at = self.b.ins().iconst(self.ptr, site_at); let code = self.code_ptr(); let slotv = self.b.ins().iconst(types::I64, slot as i64); let local = self @@ -6825,9 +10935,9 @@ impl<'a> Lower<'a> { self.global_caches.push(cache); let helper = self.b.create_block(); let done = self.b.create_block(); - if self.cold { - self.b.ins().jump(helper, &[]); - } else { + // (In line even in a lean body: the cached read is a few loads + // and compares, the helper's a full call.) + { let ptr = self.ptr; let c = self.b.ins().iconst(ptr, cache_at); let frame = self.b.ins().load(ptr, FLAGS, self.st, S_FRAME); @@ -6922,19 +11032,168 @@ impl<'a> Lower<'a> { return false; } self.flush(); + let helper = self.b.create_block(); + let done = self.b.create_block(); + let fn_counted = self.tags.rc_counted & (1i64 << self.tags.function) != 0; + let cache: Box = Box::default(); + let cache_at = std::ptr::from_ref::(&cache) as i64; + self.method_caches.push(cache); + // A site that loaded an exact `list`, `dict`, `set` or `str` + // receiver's method: for a receiver of that variant, the method + // (the code holds it) with a count taken, the receiver above it. + if let Some((want, f)) = self.builtin_method_load(pc) { + let recv = self.slot_addr(self.depth - 1); + let above = self.slot_addr(self.depth); + let tag = self.tag_at(recv); + let other = self.b.ins().icmp_imm(IntCC::NotEqual, tag, i64::from(want)); + self.branch_out(other, helper); + let rflag = self.b.ins().iconst( + self.ptr, + std::ptr::from_ref(crate::sync::rc_shared_flag()) as i64, + ); + let rshared = self.b.ins().uload8(types::I64, FLAGS, rflag, 0); + self.branch_out(rshared, helper); + let obj = Object::Builtin(f.clone()); + let btag = obj.tag(); + // SAFETY: an `Object` is 16 bytes; its second word is the + // payload, where a counted builtin's count is. + let word = unsafe { std::ptr::from_ref(&obj).cast::<[u64; 2]>().read() }[1]; + drop(obj); + self.held.push(f); + let w = self.b.ins().iconst(types::I64, word as i64); + let count = self.b.ins().load(types::I64, FLAGS, w, 0); + let count = self.b.ins().iadd_imm(count, 1); + self.b.ins().store(FLAGS, count, w, 0); + self.copy16(above, recv); + self.write_tag(recv, btag); + self.b.ins().store(FLAGS, w, recv, 8); + self.b.ins().jump(done, &[]); + self.b.switch_to_block(helper); + return self.load_method_helper(pc, cache_at, done); + } + match self.layout { + // An instance of the class the site last saw, which holds no + // dictionary and fewer values than the name's position among + // its class's names: the cached function, the receiver above + // it. + Some(l) if fn_counted => { + let l = *l; + let ptr = self.ptr; + let recv = self.slot_addr(self.depth - 1); + let above = self.slot_addr(self.depth); + let c = self.b.ins().iconst(ptr, cache_at); + let tag = self.tag_at(recv); + let not_inst = + self.b + .ins() + .icmp_imm(IntCC::NotEqual, tag, i64::from(self.tags.instance)); + self.branch_out(not_inst, helper); + let inst = self.b.ins().load(ptr, FLAGS, recv, 8); + let cls = self.b.ins().load(ptr, FLAGS, inst, l.inst_class); + let ver = self + .b + .ins() + .load(types::I64, FLAGS, cls, l.type_attr_version); + let want = self.b.ins().load(types::I64, FLAGS, c, MC_VER); + let lazy = self.b.ins().load(ptr, FLAGS, inst, l.inst_dict_lazy); + let flag = self.b.ins().iconst(ptr, l.cells_unguarded as i64); + let unguarded = self.b.ins().uload8(types::I64, FLAGS, flag, 0); + let rflag = self.b.ins().iconst( + ptr, + std::ptr::from_ref(crate::sync::rc_shared_flag()) as i64, + ); + let rshared = self.b.ins().uload8(types::I64, FLAGS, rflag, 0); + let borrow = self.b.ins().sload32(FLAGS, inst, l.inst_split_borrow); + let unset = self.b.ins().icmp_imm(IntCC::Equal, want, 0); + let stale = self.b.ins().icmp(IntCC::NotEqual, ver, want); + let busy = self.b.ins().icmp_imm(IntCC::SignedLessThan, borrow, 0); + let other = self.b.ins().bor(lazy, unguarded); + let other = self.b.ins().bor(other, rshared); + let other = self.b.ins().icmp_imm(IntCC::NotEqual, other, 0); + let bad = self.b.ins().bor(unset, stale); + let bad = self.b.ins().bor(bad, busy); + let bad = self.b.ins().bor(bad, other); + self.branch_out(bad, helper); + let block = self.b.ins().load(ptr, FLAGS, inst, l.inst_split_block); + let check = self.b.create_block(); + let hit = self.b.create_block(); + self.b.ins().brif(block, check, &[], hit, &[]); + self.b.switch_to_block(check); + let n = self.b.ins().uload32(FLAGS, block, l.split_len); + let keys = self.b.ins().load(types::I64, FLAGS, block, l.split_keys); + let ckeys = self.b.ins().load(types::I64, FLAGS, c, MC_KEYS); + let before = self.b.ins().uload32(FLAGS, c, MC_BEFORE); + let empty = self.b.ins().icmp_imm(IntCC::Equal, n, 0); + let same = self.b.ins().icmp(IntCC::Equal, keys, ckeys); + let short = self.b.ins().icmp(IntCC::UnsignedLessThanOrEqual, n, before); + let held = self.b.ins().band(same, short); + let ok = self.b.ins().bor(empty, held); + self.b.ins().brif(ok, hit, &[], helper, &[]); + self.b.switch_to_block(hit); + // The function's count, then the receiver up and the + // function in its place. + let f = self.b.ins().load(types::I64, FLAGS, c, MC_FUNC); + let count = self.b.ins().load(types::I64, FLAGS, f, 0); + let count = self.b.ins().iadd_imm(count, 1); + self.b.ins().store(FLAGS, count, f, 0); + self.copy16(above, recv); + self.write_tag(recv, self.tags.function); + self.b.ins().store(FLAGS, f, recv, 8); + self.b.ins().jump(done, &[]); + } + _ => { + self.b.ins().jump(helper, &[]); + } + } + self.b.switch_to_block(helper); + self.load_method_helper(pc, cache_at, done) + } + + /// The method load at `pc` whose site last loaded a builtin type's + /// method for an exact `list`, `dict`, `set` or `str` receiver whose + /// count compiled code may take in line: the receiver variant's tag + /// and the method. + fn builtin_method_load(&self, pc: usize) -> Option<(u8, Rc)> { + if self.cold { + return None; + } + let (tag, f) = crate::load_method_builtin(self.ext, pc)?; + let want = match tag { + 1 => self.tags.list, + 2 => self.tags.dict, + 3 => self.tags.set, + 4 => self.tags.str, + _ => return None, + }; + let counted = Object::Builtin(f.clone()).tag(); + (counted < 64 && self.tags.rc_counted & (1i64 << counted) != 0).then_some((want, f)) + } + + /// [`Self::load_method`]'s helper call, in the current block, then the + /// join at `done`. + fn load_method_helper(&mut self, pc: usize, cache_at: i64, done: Block) -> bool { let code = self.code_ptr(); let ext = self.ext_ptr(); let pcv = self.b.ins().iconst(types::I64, pc as i64); let len = self.b.ins().iconst(types::I64, self.depth as i64); + let c = self.b.ins().iconst(self.ptr, cache_at); + let mcache: Box = Box::default(); + let mc = self + .b + .ins() + .iconst(self.ptr, std::ptr::from_ref::(&mcache) as i64); + self.mod_caches.push(mcache); let r = self .call( h_load_method as *const () as usize, - &[self.st, code, ext, pcv, len], + &[self.st, code, ext, pcv, len, c, mc], true, ) .expect("returns"); let out = self.exit_with(pc, &[], INTERP); self.branch_out(r, out); + self.b.ins().jump(done, &[]); + self.b.switch_to_block(done); self.depth += 1; self.set_last(pc); self.check_released(pc + 1); @@ -7041,15 +11300,55 @@ impl<'a> Lower<'a> { let ext = self.ext_ptr(); let pcv = self.b.ins().iconst(types::I64, pc as i64); let len = self.b.ins().iconst(types::I64, self.depth as i64); - // A Python function's call tries a direct call first, unless its - // site found the callee without a native body and has retries - // left to count down. + // A site settled on a builtin calls it through its own helper, + // which checks the callee against the site's builtin by address + // (anything else goes on to `h_call`). + if let Some(helper) = self.builtin_site(pc, argc) { + let (helper, site) = helper; + let r = self + .call(helper, &[self.st, code, ext, pcv, len, site], true) + .expect("returns"); + return self.called(pc, argc, r); + } let site: Box = Box::default(); let site_at = self .b .ins() .iconst(self.ptr, std::ptr::from_ref::(&site) as i64); self.direct_sites.push(site); + let r = if self.cold { + // A lean body makes [`Self::call_choice`]'s choice in a helper. + let pc_argc = self + .b + .ins() + .iconst(types::I64, (pc as i64) | ((argc as i64) << 32)); + self.call( + h_call_site as *const () as usize, + &[self.st, code, ext, pc_argc, len, site_at], + true, + ) + .expect("returns") + } else { + self.call_choice(pc, argc, code, ext, pcv, len, site_at) + }; + self.called(pc, argc, r) + } + + /// [`Self::call_op`]'s choice in line: a Python function's call tries + /// a direct call first, unless its site found the callee without a + /// native body and has retries left to count down (as + /// [`h_call_site`]). The helper's status. + #[allow(clippy::too_many_arguments)] + fn call_choice( + &mut self, + pc: usize, + argc: usize, + code: Value, + ext: Value, + pcv: Value, + len: Value, + site_at: Value, + ) -> Value { let callee = self.slot_addr(self.depth - argc - 2); let tag = self.tag_at(callee); let is_fn = self @@ -7065,8 +11364,8 @@ impl<'a> Lower<'a> { self.b.append_block_param(called, types::I32); self.b.ins().brif(is_fn, fresh, &[], general, &[]); self.b.switch_to_block(fresh); - let native = self.b.ins().load(types::I64, FLAGS, site_at, DS_NATIVE); - self.b.ins().brif(native, direct, &[], waiting, &[]); + let hot = self.b.ins().load(types::I64, FLAGS, site_at, DS_HOT); + self.b.ins().brif(hot, direct, &[], waiting, &[]); self.b.switch_to_block(waiting); let retry = self.b.ins().load(types::I32, FLAGS, site_at, DS_RETRY); self.b.ins().brif(retry, counted, &[], direct, &[]); @@ -7075,10 +11374,15 @@ impl<'a> Lower<'a> { self.b.ins().store(FLAGS, left, site_at, DS_RETRY); self.b.ins().jump(general, &[]); self.b.switch_to_block(direct); + // (The direct helper takes the argument count with the pc.) + let pc_argc = self + .b + .ins() + .iconst(types::I64, (pc as i64) | ((argc as i64) << 32)); let r = self .call( h_call_direct as *const () as usize, - &[self.st, code, ext, pcv, len, site_at], + &[self.st, code, ext, pc_argc, len, site_at], true, ) .expect("returns"); @@ -7093,13 +11397,95 @@ impl<'a> Lower<'a> { .expect("returns"); self.b.ins().jump(called, &[r.into()]); self.b.switch_to_block(called); - let r = self.b.block_params(called)[0]; + self.b.block_params(called)[0] + } + + /// The helper and its site for a `CALL` (of `argc` arguments) at `pc` + /// whose site settled on a builtin (see [`BuiltinSite`]): a leaf kind + /// with a kernel through [`h_call_kernel`], one run in place through + /// [`h_call_leaf`], a body through the core loop's lane through + /// [`h_call_native`]; `None` for anything else (`h_call` alone). + fn builtin_site(&mut self, pc: usize, argc: usize) -> Option<(usize, Value)> { + use crate::LeafKind; + let Some((f, kind, via_call)) = crate::call_site_builtin(self.ext, pc) else { + let cls = crate::call_site_type(self.ext, pc)?; + let site = Box::new(TypeSite { cls, argc }); + let at = self + .b + .ins() + .iconst(self.ptr, std::ptr::from_ref::(&site) as i64); + self.type_sites.push(site); + return Some((h_call_type as *const () as usize, at)); + }; + let (kernel, recv_tag) = match kind { + // (An opaque body's kernel is the body: run in place on any + // receiver below.) + Some(k) if k != LeafKind::Opaque => (1..=4) + .find_map(|t| kernel_for(t, k, argc).map(|kn| (Some(kn), t))) + .map_or((None, 0), |(kn, t)| { + let tag = match t { + 1 => self.tags.list, + 2 => self.tags.dict, + 3 => self.tags.set, + _ => self.tags.str, + }; + (kn, tag) + }), + _ => (None, 0), + }; + let in_core = kind.is_some_and(LeafKind::runs_in_core); + let helper = match kind { + None => h_call_native as *const () as usize, + Some(_) if kernel.is_some() => h_call_kernel as *const () as usize, + Some(_) if in_core => h_call_leaf as *const () as usize, + Some(_) => return None, + }; + let site = Box::new(BuiltinSite { + f: Rc::as_ptr(&f), + argc, + kind, + kernel, + recv_tag, + via_call, + }); + self.held.push(f); + let at = self + .b + .ins() + .iconst(self.ptr, std::ptr::from_ref::(&site) as i64); + self.builtin_sites.push(site); + Some((helper, at)) + } + + /// After a `CALL`'s helper returned `r`: the result in place on `0` + /// (the callee and `argc` operands gone), the core loop's on anything + /// else. + fn called(&mut self, pc: usize, argc: usize, r: Value) -> bool { let out = self.exit_with(pc, &[], INTERP); let ran = self.b.create_block(); let other = self.b.create_block(); self.b.ins().brif(r, other, &[], ran, &[]); // Raised or switched: the core loop takes it from the state. self.b.switch_to_block(other); + // `await f(...)` of a coroutine function: a coroutine the call + // started and that returned goes on at the await's `END_SEND` + // (see `gen_call_done`). + if let Some(send_pc) = crate::await_send_after(self.code, pc) { + let exit = send_pc + 1 + self.code.instructions[send_pc].arg as usize; + let start = self.depth - argc - 2; + if self.depths.get(exit).copied() == Some(start as i64 + 2) { + let awaited = self.b.create_block(); + let rest = self.b.create_block(); + let is = self.b.ins().icmp_imm(IntCC::Equal, r, i64::from(AWAITED)); + self.b.ins().brif(is, awaited, &[], rest, &[]); + self.b.switch_to_block(awaited); + let depth = std::mem::replace(&mut self.depth, start + 2); + self.set_last(send_pc); + self.goto(exit); + self.depth = depth; + self.b.switch_to_block(rest); + } + } let declined = self .b .ins() @@ -7118,10 +11504,22 @@ impl<'a> Lower<'a> { /// `CALL_KW` through [`h_call_kw`] (as [`Self::call_op`]; the depth /// after is the static one). fn call_kw(&mut self, pc: usize) -> bool { - let after = self.depths.get(pc + 1).copied().unwrap_or(-1); - if after < 0 || self.depth == 0 { - self.exit(INTERP, pc); - return false; + self.call_with(pc, h_call_kw as *const () as usize) + } + + /// `CALL_FUNCTION_EX` through [`h_call_ex`] (as [`Self::call_kw`]). + fn call_ex(&mut self, pc: usize) -> bool { + self.call_with(pc, h_call_ex as *const () as usize) + } + + /// `f(*args, **kwargs)`'s forwarding run, `BUILD_MAP 0` at `pc` through + /// its `CALL_FUNCTION_EX`, through [`h_call_forward`] (as + /// [`Self::call_with`]): the block goes on past the call; a decline + /// leaves at the `BUILD_MAP`, where the core loop runs it. + fn call_forward(&mut self, pc: usize) -> bool { + let after = self.depths.get(pc + 4).copied().unwrap_or(-1); + if after < 0 || self.depth < 3 || self.blocks.get(pc + 4).copied().flatten().is_none() { + return self.build_map(pc, 0); } self.flush(); self.store_last(); @@ -7130,7 +11528,7 @@ impl<'a> Lower<'a> { let len = self.b.ins().iconst(types::I64, self.depth as i64); let r = self .call( - h_call_kw as *const () as usize, + h_call_forward as *const () as usize, &[self.st, code, pcv, len], true, ) @@ -7150,6 +11548,43 @@ impl<'a> Lower<'a> { self.leave(r); self.b.switch_to_block(ran); self.depth = after as usize; + self.set_last(pc + 3); + self.check_released(pc + 4); + self.goto(pc + 4); + false + } + + /// A call instruction through `helper` (`h_call_kw`'s signature): the + /// result in place when it ran, anything else the core loop's. + fn call_with(&mut self, pc: usize, helper: usize) -> bool { + let after = self.depths.get(pc + 1).copied().unwrap_or(-1); + if after < 0 || self.depth == 0 { + self.exit(INTERP, pc); + return false; + } + self.flush(); + self.store_last(); + let code = self.code_ptr(); + let pcv = self.b.ins().iconst(types::I64, pc as i64); + let len = self.b.ins().iconst(types::I64, self.depth as i64); + let r = self + .call(helper, &[self.st, code, pcv, len], true) + .expect("returns"); + let out = self.exit_with(pc, &[], INTERP); + let ran = self.b.create_block(); + let other = self.b.create_block(); + self.b.ins().brif(r, other, &[], ran, &[]); + self.b.switch_to_block(other); + let declined = self + .b + .ins() + .icmp_imm(IntCC::Equal, r, i64::from(CALL_DECLINED)); + let leave = self.b.create_block(); + self.b.ins().brif(declined, out, &[], leave, &[]); + self.b.switch_to_block(leave); + self.leave(r); + self.b.switch_to_block(ran); + self.depth = after as usize; self.set_last(pc); self.check_released(pc + 1); true @@ -7288,5 +11723,14 @@ impl<'a> Lower<'a> { } /// Where a field cache's version and position sit. +/// Where a class keeps [`crate::types::TypeObject::slot_layout_word`], +/// from its pointer (measured as `layout`'s `type_attr_version` is). +fn type_slot_layout(l: &weavepy_jit::ObjLayout) -> i32 { + use crate::types::TypeObject; + let base = + l.type_attr_version as isize - std::mem::offset_of!(TypeObject, attr_version) as isize; + (base + std::mem::offset_of!(TypeObject, slot_layout_word) as isize) as i32 +} + const FIELD_VER: i32 = std::mem::offset_of!((u64, u32), 0) as i32; const FIELD_IDX: i32 = std::mem::offset_of!((u64, u32), 1) as i32; diff --git a/crates/weavepy-vm/src/frozen_code_cache.rs b/crates/weavepy-vm/src/frozen_code_cache.rs index 62d3af8a..7fe147bc 100644 --- a/crates/weavepy-vm/src/frozen_code_cache.rs +++ b/crates/weavepy-vm/src/frozen_code_cache.rs @@ -162,12 +162,19 @@ fn disk_path(name: &str) -> Option { /// path may differ from the writer's), installed into the in-memory /// cache, and returned. Any mismatch or decode failure is a miss. pub fn get_disk(name: &str, source: &str, filename: &str) -> Option { - let bytes = std::fs::read(disk_path(name)?).ok()?; - if bytes.len() < FROZEN_HEADER_LEN || &bytes[0..4] != FROZEN_MAGIC { + use std::io::Read; + use weavepy_compiler::native_code; + let mut file = std::fs::File::open(disk_path(name)?).ok()?; + let size = usize::try_from(file.metadata().ok()?.len()).ok()?; + // The header and the payload's first bytes, which say where its table + // section starts. + let mut head = [0u8; FROZEN_HEADER_LEN + 5]; + file.read_exact(&mut head).ok()?; + if &head[0..4] != FROZEN_MAGIC { return None; } - let len = u32::from_le_bytes(bytes[8..12].try_into().ok()?); - let hash = u64::from_le_bytes(bytes[12..20].try_into().ok()?); + let len = u32::from_le_bytes(head[8..12].try_into().ok()?); + let hash = u64::from_le_bytes(head[12..20].try_into().ok()?); // An embedded module's hash comes from the build: computing it here // would page in the whole source text the cached code stands for. if len as usize != source.len() || hash != crate::stdlib::frozen_source_hash(name, source) { @@ -177,9 +184,42 @@ pub fn get_disk(name: &str, source: &str, filename: &str) -> Option // same artifact again, and a resident clone of every loaded module's // code would double its footprint in the (usual) single-interpreter // process. - weavepy_compiler::native_code::decode(&bytes[FROZEN_HEADER_LEN..], filename) + let at = native_code::tables_at(&head[FROZEN_HEADER_LEN..])?; + let tables_start = FROZEN_HEADER_LEN.checked_add(at).filter(|&t| t <= size)?; + let mut payload = Vec::with_capacity(size - FROZEN_HEADER_LEN); + payload.extend_from_slice(&head[FROZEN_HEADER_LEN..]); + if size - tables_start < MAP_TABLES_FROM { + file.read_to_end(&mut payload).ok()?; + return native_code::decode(&payload, filename); + } + // A large table section is mapped rather than read: most of its + // tables (column spans, wire marks) are never read, and pages never + // touched take no memory. + (&mut file) + .take((at - payload.len()) as u64) + .read_to_end(&mut payload) + .ok()?; + // SAFETY: the cache's writers replace an artifact by renaming a new + // file over it, never by changing it in place, so the mapped bytes + // keep the contents just validated (a replaced or removed file keeps + // them while mapped). + let tables = unsafe { + memmap2::MmapOptions::new() + .offset(tables_start as u64) + .len(size - tables_start) + .map(&file) + } + .ok()?; + native_code::decode_split( + &payload, + weavepy_compiler::TableBuffer::new(tables), + filename, + ) } +/// The shortest table section [`get_disk`] maps rather than reads. +const MAP_TABLES_FROM: usize = 8 * 1024; + /// Persist a freshly-compiled frozen module to the disk cache. /// Best-effort: any I/O or marshal failure is silently ignored (a /// read-only cache dir must not fail the import). @@ -231,7 +271,7 @@ mod tests { fn cache_returns_fresh_copies() { clear(); let mut code = CodeObject::default(); - code.name = "foo".to_owned(); + code.name = "foo".into(); insert("foo", &code); let got = get("foo").expect("hit"); assert_eq!(got.name, "foo"); @@ -243,7 +283,7 @@ mod tests { use weavepy_compiler::{CacheTable, InlineCache}; clear(); let mut code = CodeObject::default(); - code.name = "warmed".to_owned(); + code.name = "warmed".into(); code.caches = CacheTable::with_len(2); code.caches.set(0, InlineCache::BinOpAddInt); insert("warmed", &code); diff --git a/crates/weavepy-vm/src/gc_trace.rs b/crates/weavepy-vm/src/gc_trace.rs index 4c4ef241..3497768b 100644 --- a/crates/weavepy-vm/src/gc_trace.rs +++ b/crates/weavepy-vm/src/gc_trace.rs @@ -10,10 +10,7 @@ //! so objects — and the cycles they form — routinely span OS threads. //! A single shared `GcState` is the only design that can break a //! cross-thread cycle, and it mirrors CPython's one-collector-per- -//! interpreter model. `Arc` gives the collector and -//! the weakref registry shared ownership of each slot; the `Arc` is -//! genuinely `Send + Sync` now, so no Clippy suppression is needed for -//! it. +//! interpreter model. //! //! The model: //! @@ -73,12 +70,10 @@ use crate::fasthash::ObjectIdHasher; use crate::shared_value::ThinArc; -use crate::sync::Rc as HandleRc; + use crate::sync::RefCell; use std::hash::BuildHasherDefault; -use std::sync::atomic::{ - AtomicBool, AtomicI64, AtomicU32, AtomicU64, AtomicU8, AtomicUsize, Ordering, -}; +use std::sync::atomic::{AtomicBool, AtomicI64, AtomicU64, AtomicUsize, Ordering}; use crate::object::Object; use crate::weak_object::WeakObject; @@ -87,34 +82,9 @@ use crate::weakref_registry::{id_of, ObjectId}; /// A set of object ids (addresses), hashed with the address mixer. type IdSet = std::collections::HashSet>; -/// The collector's id index: each tracked object's handle, found by the -/// id the handle carries (one word a bucket, against two for a map from -/// the id to the handle). -type GcIndex = std::collections::HashSet>; - -/// A [`GcIndex`] entry: a handle, hashed, compared and looked up by its id. -struct IndexEntry(HandleRc); - -impl std::hash::Hash for IndexEntry { - fn hash(&self, state: &mut H) { - // As `ObjectId` hashes, so a lookup by id finds it. - self.0.id.hash(state); - } -} - -impl PartialEq for IndexEntry { - fn eq(&self, other: &Self) -> bool { - self.0.id == other.0.id - } -} - -impl Eq for IndexEntry {} - -impl std::borrow::Borrow for IndexEntry { - fn borrow(&self) -> &ObjectId { - &self.0.id - } -} +/// The registry's id index: a tracked object's slot by its payload +/// address, for the kinds that don't record their slot themselves. +type GcIndex = std::collections::HashMap>; /// The standard CPython generation count (3) and default /// thresholds (CPython 3.14's): gen 0 collects when 2000 net tracked allocations @@ -123,7 +93,6 @@ impl std::borrow::Borrow for IndexEntry { pub const N_GENERATIONS: usize = 3; // Color and generation are bounded states; reference counts remain full-width. const _: () = assert!(N_GENERATIONS > 0 && N_GENERATIONS <= u8::MAX as usize + 1); -const MAX_GENERATION: u8 = (N_GENERATIONS - 1) as u8; pub const DEFAULT_THRESHOLDS: [usize; N_GENERATIONS] = [2000, 10, 10]; /// Upper bound on the number of mark-sweep passes a single @@ -155,156 +124,322 @@ pub trait Finalize { fn finalize(&self); } -/// A tracked object's entry: a non-owning handle on the object plus the -/// bookkeeping that outlives a collection. The collector never keeps an -/// object alive. An entry whose object died stays in its generation until -/// the next collection or prune of that generation drops it; its weak -/// handle keeps the allocation reserved until then, so the address the -/// index keys it by can't be reused by another object meanwhile. -#[allow(missing_debug_implementations)] -pub struct TrackedHandle { - /// The tracked object, held weakly. - pub object: WeakObject, - /// Identity, computed from `id_of(object)` at `track` time. - pub id: ObjectId, - /// [`color::Frozen`] while `gc.freeze()` holds the entry, otherwise - /// [`color::White`]. Collections keep their marking state in the - /// candidates they build, not here. - pub color: AtomicU8, - /// Generation index (0..N_GENERATIONS). Survivors are promoted by - /// incrementing this. - pub generation: AtomicU8, - /// Position of this handle within its owning `Vec` — - /// `generations[generation].handles` normally, or the `frozen` - /// list when `color == Frozen`. Maintained by every site that - /// pushes, drains, or rebuilds those vectors so that - /// [`GcState::untrack_id`] can `swap_remove` in O(1). - pub slot: CachedSlot, - /// Has this object's `__del__` already *run* to completion? CPython - /// guarantees a finaliser runs at most once. - pub finalized: AtomicBool, - /// Has this object's `__del__` been *queued* by a collection but not yet - /// run? While set, the object is excluded from the `collected` count: - /// its finalizer (drained after `gc.collect()` returns) may resurrect - /// it, and CPython only counts objects that are actually reclaimed. - pub finalize_queued: AtomicBool, -} - -/// A compact vector-position hint, with separate absent and uncached states. -/// -/// Positions too large to cache use the pointer-search fallback. Neither -/// decoded sentinel can index a live `Vec>`, whose -/// allocation is bounded by `isize::MAX`. +/// No registry slot: the [`GcSlot`] of an object the collector doesn't +/// hold, and the end of the free list. +pub const NO_SLOT: u32 = u32::MAX; + +/// The registry slot an object of a kind that records its own (see +/// [`Registry`]) carries: [`NO_SLOT`] while it isn't registered. A copy of +/// the object is another object, so a clone starts unregistered. #[derive(Debug)] -pub struct CachedSlot(AtomicU32); - -impl CachedSlot { - const fn encode(slot: usize) -> u32 { - if slot == usize::MAX { - u32::MAX - } else if slot >= (u32::MAX - 1) as usize { - u32::MAX - 1 - } else { - slot as u32 - } +pub struct GcSlot(crate::sync::Cell); + +impl GcSlot { + pub fn new() -> Self { + Self(crate::sync::Cell::new(NO_SLOT)) } - const fn decode(slot: u32) -> usize { - if slot == u32::MAX { - usize::MAX - } else if slot == u32::MAX - 1 { - usize::MAX - 1 - } else { - slot as usize - } + #[inline] + pub fn get(&self) -> u32 { + self.0.get() } - pub const fn new(slot: usize) -> Self { - Self(AtomicU32::new(Self::encode(slot))) + #[inline] + fn set(&self, slot: u32) { + self.0.set(slot); } + /// Whether the object has a registry entry. #[inline] - pub fn load(&self, order: Ordering) -> usize { - Self::decode(self.0.load(order)) + pub fn is_registered(&self) -> bool { + self.get() != NO_SLOT + } +} + +impl Default for GcSlot { + fn default() -> Self { + Self::new() } +} +impl Clone for GcSlot { + fn clone(&self) -> Self { + Self::new() + } +} + +/// [`Entry::gen`] of an entry `gc.freeze()` holds (it sits in the frozen +/// list). +const GEN_FROZEN: u8 = 0xfe; +/// [`Entry::gen`] of a free slot. +const GEN_FREE: u8 = 0xff; + +/// [`Entry::flags`]: the object's `__del__` has run to completion +/// (CPython guarantees a finalizer runs at most once). +const F_FINALIZED: u8 = 1; +/// The object's `__del__` was queued by a collection and hasn't run yet. +/// While set, the object is excluded from the `collected` count: its +/// finalizer (drained after `gc.collect()` returns) may resurrect it, and +/// CPython only counts objects that are actually reclaimed. +const F_QUEUED: u8 = 2; +/// The object is a candidate of the collection in progress; the entry's +/// `gc_refs` holds its marking count. +const F_CAND: u8 = 4; +/// The collection in progress found the candidate reachable from outside +/// the candidates (its marking color is grey or black). +const F_REACHED: u8 = 8; + +/// One registered object: a non-owning handle on it plus the bookkeeping +/// that outlives a collection. The collector never keeps an object alive. +/// An entry whose object died stays in its generation until its removal +/// (an instance removes its own from its `Drop`) or the next prune or +/// collection of that generation; its weak handle keeps the allocation +/// reserved until then, so the address the index keys it by can't be +/// reused by another object meanwhile. +struct Entry { + /// The object, held weakly; `None` for a free slot. + obj: Option, + /// Position in the owning list (`gens[gen]`, or `frozen`), or the next + /// free slot for a free one. + pos: u32, + /// While [`F_CAND`] is set: the object's references from outside the + /// candidates, as the collection counts them (CPython's `gc_refs`). + gc_refs: std::cell::Cell, + /// While [`F_CAND`] is set: the candidate's node number in the + /// collection's edge lists. + node: std::cell::Cell, + /// Generation (0..N_GENERATIONS), [`GEN_FROZEN`] or [`GEN_FREE`]. + gen: u8, + /// [`F_FINALIZED`], [`F_QUEUED`] and [`F_CAND`]. + flags: std::cell::Cell, +} + +impl Entry { #[inline] - pub fn store(&self, slot: usize, order: Ordering) { - self.0.store(Self::encode(slot), order); + fn has(&self, flag: u8) -> bool { + self.flags.get() & flag != 0 } #[inline] - pub fn swap(&self, slot: usize, order: Ordering) -> usize { - Self::decode(self.0.swap(Self::encode(slot), order)) - } -} - -#[allow(non_upper_case_globals)] -pub mod color { - pub const White: u8 = 0; - pub const Grey: u8 = 1; - pub const Black: u8 = 2; - pub const Frozen: u8 = 3; -} - -impl TrackedHandle { - /// A generation-`generation` entry for `object`, or `None` for a value - /// with no heap allocation of its own. - pub fn new(object: &Object, generation: usize) -> Option { - assert!(generation < N_GENERATIONS, "invalid collector generation"); - Some(Self { - id: id_of(object), - object: WeakObject::new(object)?, - color: AtomicU8::new(color::White), - generation: AtomicU8::new(generation as u8), - slot: CachedSlot::new(0), - finalized: AtomicBool::new(false), - finalize_queued: AtomicBool::new(false), - }) + fn set(&self, flag: u8, on: bool) { + let f = self.flags.get(); + self.flags.set(if on { f | flag } else { f & !flag }); } } -/// Swap-remove the handle at `slot` from `vec`, fixing up the slot -/// index of whatever handle gets moved into the vacated position. -/// O(1): the only handle whose position changes is the one swapped -/// in from the end, and its `slot` field is corrected here so the -/// per-handle position invariant holds after the call. +/// Whether the registry finds `w`'s object through the object's own +/// [`GcSlot`] (instances, classes, functions and the generator family) +/// rather than the id index. #[inline] -fn swap_remove_handle(vec: &mut Vec>, slot: usize) { - if slot >= vec.len() { - return; +fn slot_is_intrusive(w: &WeakObject) -> bool { + matches!( + w, + WeakObject::Instance(_) + | WeakObject::Type(_) + | WeakObject::Function(_) + | WeakObject::Generator(_) + | WeakObject::Coroutine(_) + | WeakObject::AsyncGenerator(_) + ) +} + +/// The [`GcSlot`] of a kind that records its own registry slot. +#[inline] +fn intrusive_slot(obj: &Object) -> Option<&GcSlot> { + match obj { + Object::Instance(i) => Some(&i.gc_slot), + Object::Type(t) => Some(&t.gc_slot), + Object::Function(f) => Some(&f.gc_slot), + Object::Generator(g) | Object::Coroutine(g) | Object::AsyncGenerator(g) => Some(&g.gc_slot), + _ => None, } - vec.swap_remove(slot); - if let Some(moved) = vec.get(slot) { - moved.slot.store(slot, Ordering::Release); +} + +/// The [`GcSlot`] of the object `w` names, of a kind that records its own. +/// +/// # Safety +/// +/// The object must be alive. +#[inline] +unsafe fn weak_intrusive_slot(w: &WeakObject) -> Option<&GcSlot> { + // SAFETY: alive, per the caller; the handle keeps the allocation. + unsafe { + match w { + WeakObject::Instance(w) => Some(&(*w.as_ptr()).gc_slot), + WeakObject::Type(w) => Some(&(*w.as_ptr()).gc_slot), + WeakObject::Function(w) => Some(&(*w.as_ptr()).gc_slot), + WeakObject::Generator(w) | WeakObject::Coroutine(w) | WeakObject::AsyncGenerator(w) => { + Some(&(*w.as_ptr()).gc_slot) + } + _ => None, + } } } -/// Correctness fallback for [`GcState::untrack_id`]: when a handle's cached -/// `slot` no longer points at it (a concurrent `swap_remove`/promotion on -/// another OS thread moved it before this thread acquired the vector lock), -/// locate it by pointer identity and `swap_remove` it. Returns `true` if the -/// handle was found and removed. O(n) in the generation length, but only ever -/// taken on the rare stale-cache path — the common case stays O(1). +/// Forget the registry slot a live object records (its entry is going). +/// A dead one's field is gone with it. #[inline] -fn remove_handle_by_ptr( - vec: &mut Vec>, - handle: &HandleRc, -) -> bool { - if let Some(pos) = vec.iter().position(|h| HandleRc::ptr_eq(h, handle)) { - swap_remove_handle(vec, pos); - true - } else { - false +fn clear_intrusive_slot(w: &WeakObject) { + fn clear(w: &crate::sync::Weak, slot: impl Fn(&T) -> &GcSlot) { + if w.strong_count() > 0 { + // SAFETY: the object is alive (the handle keeps the + // allocation, the count says the payload is live), and the + // field is an atomic cell. + slot(unsafe { &*w.as_ptr() }).set(NO_SLOT); + } + } + match w { + WeakObject::Instance(w) => clear(w, |i| &i.gc_slot), + WeakObject::Type(w) => clear(w, |t| &t.gc_slot), + WeakObject::Function(w) => clear(w, |f| &f.gc_slot), + WeakObject::Generator(w) | WeakObject::Coroutine(w) | WeakObject::AsyncGenerator(w) => { + clear(w, |g| &g.gc_slot); + } + _ => {} } } -#[derive(Default)] -struct Generation { - /// All tracked handles in this generation. Append-only - /// during normal allocation; rewritten in place when - /// objects are promoted or moved to the unreachable list. - handles: Vec>, +/// The registry of tracked objects: a slab of entries addressed by slot, +/// one list of slots per generation (and one for the frozen set), and an +/// id index for the kinds that don't record their own slot. +/// +/// Every list keeps each member's position in its entry, so a removal is +/// a swap with the list's last member, and a collection walks a +/// generation without hashing. An instance records its slot itself +/// ([`crate::types::PyInstance::gc_slot`]), so registering one, finding +/// it from an edge, and its death's removal never touch the index. +struct Registry { + slab: Vec, + /// Head of the free-slot list (threaded through `Entry::pos`). + free: u32, + gens: [Vec; N_GENERATIONS], + frozen: Vec, + /// Payload address -> slot, for the kinds without an intrusive slot. + index: GcIndex, +} + +impl Registry { + fn new() -> Self { + Self { + slab: Vec::new(), + free: NO_SLOT, + gens: Default::default(), + frozen: Vec::new(), + index: GcIndex::default(), + } + } + + #[inline] + fn entry(&self, slot: u32) -> &Entry { + &self.slab[slot as usize] + } + + #[inline] + fn list_mut(&mut self, gen: u8) -> &mut Vec { + if gen == GEN_FROZEN { + &mut self.frozen + } else { + &mut self.gens[usize::from(gen)] + } + } + + /// The slot of the registered object `obj`, if any. `filter` is the + /// index's miss-filter. + #[inline] + fn slot_of(&self, obj: &Object, filter: &crate::hot_filter::RebuildableBloom) -> Option { + if let Some(cell) = intrusive_slot(obj) { + let s = cell.get(); + return (s != NO_SLOT).then_some(s); + } + let key = obj.payload_addr()? as ObjectId; + if !filter.may_contain(key) { + return None; + } + self.index.get(&key).copied() + } + + /// Add `obj` to list `gen` in a fresh slot. + fn insert(&mut self, obj: WeakObject, gen: u8, flags: u8) -> u32 { + let pos = self.list_mut(gen).len() as u32; + let entry = Entry { + obj: Some(obj), + pos, + gc_refs: std::cell::Cell::new(0), + node: std::cell::Cell::new(0), + gen, + flags: std::cell::Cell::new(flags), + }; + let slot = if self.free != NO_SLOT { + let slot = self.free; + let e = &mut self.slab[slot as usize]; + self.free = e.pos; + *e = entry; + slot + } else { + let slot = u32::try_from(self.slab.len()).expect("collector registry overflow"); + // (A collection's grey stack tags temporaries with the top bit.) + assert!(slot < TEMP_BIT, "collector registry overflow"); + self.slab.push(entry); + slot + }; + self.list_mut(gen).push(slot); + slot + } + + /// Take `slot` out of its list (a swap with the list's last member). + fn unlink(&mut self, slot: u32) { + let (gen, pos) = { + let e = self.entry(slot); + (e.gen, e.pos as usize) + }; + let list = self.list_mut(gen); + debug_assert_eq!(list.get(pos), Some(&slot)); + list.swap_remove(pos); + if let Some(&moved) = list.get(pos) { + self.slab[moved as usize].pos = pos as u32; + } + } + + /// Return an unlinked slot to the free list, handing back its handle + /// (whose drop only releases memory). + fn release(&mut self, slot: u32) -> Option { + let free = self.free; + let e = &mut self.slab[slot as usize]; + let w = e.obj.take(); + e.gen = GEN_FREE; + e.flags.set(0); + e.pos = free; + self.free = slot; + w + } + + /// Drop `slot`'s entry altogether: from its list, the index, and a live + /// instance's own record. + fn remove(&mut self, slot: u32) -> Option { + self.unlink(slot); + self.forget_key(slot); + self.release(slot) + } + + /// Drop the index entry (or a live instance's record) naming `slot`. + fn forget_key(&mut self, slot: u32) { + let Some(w) = self.slab[slot as usize].obj.as_ref() else { + return; + }; + if slot_is_intrusive(w) { + clear_intrusive_slot(w); + } else { + let key = w.addr() as ObjectId; + if self.index.get(&key) == Some(&slot) { + self.index.remove(&key); + } + } + } + + /// Every live member of every list, frozen ones included. + fn len(&self) -> usize { + self.gens.iter().map(Vec::len).sum::() + self.frozen.len() + } } #[derive(Debug, Default, Clone, Copy)] @@ -314,40 +449,26 @@ pub struct GcStats { pub uncollectable: u64, } -/// One object under examination by a collection: a strong reference for -/// the collection's duration, its entry (absent for a temporary candidate -/// discovered through an untracked container), and the marking state. -struct Cand { +/// The top bit of a grey-stack item: the rest is a temporary candidate's +/// position rather than a registry slot. +const TEMP_BIT: u32 = 1 << 31; + +/// A temporary candidate: an untracked object a collection found a cycle +/// could route through (see `collect_generation`'s phase 2), held for the +/// collection's duration, with its marking state. +struct Temp { obj: Object, - id: ObjectId, - entry: Option>, gc_refs: std::cell::Cell, - color: std::cell::Cell, + reached: std::cell::Cell, } -impl Cand { - fn new(obj: Object, id: ObjectId, entry: Option>) -> Self { - Self { - obj, - id, - entry, - gc_refs: std::cell::Cell::new(0), - color: std::cell::Cell::new(color::White), - } - } - - fn is_white(&self) -> bool { - self.color.get() == color::White - } - - /// Whether the object still owes a `__del__` (or a generator close). - fn pending_finalizer(&self) -> bool { - has_finalizer(&self.obj) - && !self - .entry - .as_ref() - .is_some_and(|e| e.finalized.load(Ordering::Acquire)) - } +/// A collection's view of one candidate (see [`Finder::find`]). +#[derive(Clone, Copy)] +enum Hit { + /// A registered candidate, by slot. + Real(u32), + /// A temporary, by position. + Temp(u32), } /// How many entries of the older generations each young collection or @@ -372,15 +493,13 @@ const OLD_PRUNE_BUDGET: usize = 512; /// have to find and break the cycles. #[allow(missing_debug_implementations)] pub struct GcState { - generations: RefCell<[Generation; N_GENERATIONS]>, - /// Insert-only miss-filter over `index`, maintained at - /// [`Self::track_now`] and consulted by the usually-miss `is_tracked` - /// probes. Rebuilt from `index` once most of its bits name objects - /// long gone. + /// Every tracked object, by generation (see [`Registry`]). + reg: RefCell, + /// Insert-only miss-filter over the registry's id index, maintained at + /// [`Self::register`] and consulted by the usually-miss lookups. + /// Rebuilt from the index once most of its bits name objects long + /// gone. tracked_filter: crate::hot_filter::RebuildableBloom, - /// Id → handle index over every tracked object (all generations plus - /// the frozen set): keeps `track` dedupe and `is_tracked` O(1). - index: RefCell, /// Re-entrancy guard: a nested collection would see torn generation /// lists. Atomic so the whole `GcState` is `Sync`. collecting: AtomicBool, @@ -441,10 +560,6 @@ pub struct GcState { /// and most die before any collection. young_lists: RefCell>>>>, young_dicts: RefCell>>>, - /// Frozen handles. `gc.freeze()` moves all tracked objects - /// here; they are skipped by future collections until - /// `gc.unfreeze()` runs. - frozen: RefCell>>, /// `gc.garbage` — uncollectable objects (cycles whose /// finalisers refused to release). pub garbage: RefCell>, @@ -479,9 +594,8 @@ impl Default for GcState { impl GcState { pub fn new() -> Self { Self { - generations: RefCell::new(Default::default()), + reg: RefCell::new(Registry::new()), tracked_filter: crate::hot_filter::RebuildableBloom::new(), - index: RefCell::new(GcIndex::default()), collecting: AtomicBool::new(false), thresholds: RefCell::new(DEFAULT_THRESHOLDS), counts: RefCell::new([0; N_GENERATIONS]), @@ -496,7 +610,6 @@ impl GcState { young_gens: RefCell::new(Vec::new()), young_lists: RefCell::new(Vec::new()), young_dicts: RefCell::new(Vec::new()), - frozen: RefCell::new(Vec::new()), garbage: RefCell::new(Vec::new()), callbacks: RefCell::new(Vec::new()), stats: RefCell::new([GcStats::default(); N_GENERATIONS]), @@ -527,8 +640,7 @@ impl GcState { /// holds) are consistent. pub unsafe fn reinit_after_fork_in_child(this: *mut Self) { unsafe { - RefCell::reinit_lock_after_fork(std::ptr::addr_of_mut!((*this).generations)); - RefCell::reinit_lock_after_fork(std::ptr::addr_of_mut!((*this).index)); + RefCell::reinit_lock_after_fork(std::ptr::addr_of_mut!((*this).reg)); RefCell::reinit_lock_after_fork(std::ptr::addr_of_mut!((*this).thresholds)); RefCell::reinit_lock_after_fork(std::ptr::addr_of_mut!((*this).counts)); RefCell::reinit_lock_after_fork(std::ptr::addr_of_mut!((*this).deferred)); @@ -538,7 +650,6 @@ impl GcState { RefCell::reinit_lock_after_fork(std::ptr::addr_of_mut!((*this).young_gens)); RefCell::reinit_lock_after_fork(std::ptr::addr_of_mut!((*this).young_lists)); RefCell::reinit_lock_after_fork(std::ptr::addr_of_mut!((*this).young_dicts)); - RefCell::reinit_lock_after_fork(std::ptr::addr_of_mut!((*this).frozen)); RefCell::reinit_lock_after_fork(std::ptr::addr_of_mut!((*this).garbage)); RefCell::reinit_lock_after_fork(std::ptr::addr_of_mut!((*this).callbacks)); RefCell::reinit_lock_after_fork(std::ptr::addr_of_mut!((*this).stats)); @@ -566,14 +677,27 @@ impl GcState { /// `__del__` returns, so the next collection treats a non-resurrected /// object as plain dead garbage (and a resurrected one is never /// re-finalized). - pub fn complete_finalizer(&self, id: ObjectId) { - self.note_finalized(id); - if let Some(h) = self.handle_for(id) { - h.finalized.store(true, Ordering::Release); - h.finalize_queued.store(false, Ordering::Release); + pub fn complete_finalizer(&self, obj: &Object) { + self.note_finalized(id_of(obj)); + let reg = self.reg.borrow(); + if let Some(slot) = reg.slot_of(obj, &self.tracked_filter) { + let e = reg.entry(slot); + e.set(F_FINALIZED, true); + e.set(F_QUEUED, false); } } + /// Claim `obj`'s finalizer for the caller: mark it run, returning + /// whether it had been claimed before (`None`: `obj` isn't tracked). + pub fn claim_finalizer(&self, obj: &Object) -> Option { + let reg = self.reg.borrow(); + let slot = reg.slot_of(obj, &self.tracked_filter)?; + let e = reg.entry(slot); + let was = e.has(F_FINALIZED); + e.set(F_FINALIZED, true); + Some(was) + } + /// Track `obj` for cycle detection. Idempotent — if `obj` /// is already tracked, this is a no-op. pub fn track(&self, obj: &Object) { @@ -692,29 +816,9 @@ impl GcState { } } } - if let Ok(mut lists) = self.young_lists.try_borrow_mut() { - for w in std::mem::take(&mut *lists) { - if let Some(l) = w.upgrade() { - self.register(&Object::List(l), false); - } - } - } - if let Ok(mut dicts) = self.young_dicts.try_borrow_mut() { - for w in std::mem::take(&mut *dicts) { - if let Some(d) = w.upgrade() { - self.register(&Object::Dict(d), false); - } - } - } - let young = match self.young.try_borrow_mut() { - Ok(mut young) if !young.is_empty() => std::mem::take(&mut *young), - _ => return, - }; - for w in young { - if let Some(inst) = w.upgrade() { - self.register(&Object::Instance(inst), false); - } - } + self.flush_set(&self.young_lists, WeakObject::List); + self.flush_set(&self.young_dicts, WeakObject::Dict); + self.flush_set(&self.young, WeakObject::Instance); } /// The young instances and functions still alive (the dead ones are @@ -783,11 +887,18 @@ impl GcState { return false; }; let over = { - let Ok(mut deferred) = self.deferred.try_borrow_mut() else { - // A sweep is already walking the list (it upgrades and can - // re-enter through a promotion). Track eagerly rather than - // queue onto a list we cannot touch. - return false; + // SAFETY: nothing below runs code while the list is borrowed + // (a dead predecessor's release only frees memory). + let mut guard = None; + let deferred = match unsafe { self.deferred.peek_mut() } { + Some(d) => d, + None => match self.deferred.try_borrow_mut() { + Ok(g) => &mut **guard.insert(g), + // A sweep is already walking the list (it upgrades and + // can re-enter through a promotion). Track eagerly + // rather than queue onto a list we cannot touch. + Err(_) => return false, + }, }; // The churn shape — a loop that builds a container and drops // the previous one — leaves its dead predecessors just below @@ -826,9 +937,12 @@ impl GcState { /// [`Self::sweep_deferred`] of the young deferrals, and of the old ones /// too when `old` (see [`Self::deferred_old`]); the young survivors /// join the old. + /// + /// The young sets are left alone: a sweep that compacts the deferrals + /// as they accumulate must not register every young object with them + /// (a collection, or a reflective API, flushes them itself). fn sweep_deferred_from(&self, promote_all: bool, old: bool) { - self.flush_young(); - let mut promote: Vec = Vec::new(); + let mut promote: Vec = Vec::new(); { let (Ok(mut deferred), Ok(mut aged)) = ( self.deferred.try_borrow_mut(), @@ -836,21 +950,28 @@ impl GcState { ) else { return; }; - let mut keep = |entry: &DeferredContainer| { - let Some(obj) = entry.upgrade() else { - return false; - }; - if promote_all || container_can_cycle(&obj) { - promote.push(obj); - return false; + // Keep the live entries of `from` that still hold only atomic + // values (appending them to `keep`); promote the rest. + let mut sift = |from: Vec, keep: &mut Vec| { + for entry in from { + if entry.is_dead() { + continue; + } + // SAFETY: alive (checked above), and the scan runs no + // code. + if promote_all || unsafe { entry.with_borrowed(container_can_cycle) } { + promote.push(entry.into_weak()); + } else { + keep.push(entry); + } } - true }; - deferred.retain(&mut keep); if old { - aged.retain(&mut keep); + let from = std::mem::take(&mut *aged); + sift(from, &mut aged); } - aged.append(&mut deferred); + let from = std::mem::take(&mut *deferred); + sift(from, &mut aged); if aged.len() >= DEFERRED_CAP && !old { // (Dead entries first: the old ones were left unswept.) aged.retain(|e| !e.is_dead()); @@ -858,18 +979,50 @@ impl GcState { if aged.len() >= DEFERRED_CAP { // The set has stopped being a churn buffer: hand it all // over, so these allocations resume pacing collections. - promote.extend(aged.drain(..).filter_map(|e| e.upgrade())); + promote.extend( + aged.drain(..) + .filter(|e| !e.is_dead()) + .map(DeferredContainer::into_weak), + ); } self.deferred_limit.store(DEFERRED_FLOOR, Ordering::Relaxed); } - for obj in promote { - self.track_now(&obj); + if !promote.is_empty() { + self.register_weaks(promote); + } + } + + /// [`Self::track_now`] for the live objects `weaks` names (promoted + /// deferrals), under one registry borrow. + fn register_weaks(&self, weaks: Vec) { + let mut added = 0; + { + let mut reg = self.reg.borrow_mut(); + for weak in weaks { + if weak.is_dead() { + continue; + } + // (None of these kinds records its own slot.) + let key = weak.addr() as ObjectId; + if self.tracked_filter.may_contain(key) && reg.index.contains_key(&key) { + continue; + } + // SAFETY: alive (checked above, and nothing has run since). + unsafe { self.enter(&mut reg, weak, true) }; + added += 1; + } + } + if added > 0 { + serial_add(&self.tracked_count, added); + serial_add(&self.tracked_version, 1); + self.note_gen0_allocs(added); } } /// Hand every deferred container to the collector. For the reflective /// APIs, which must enumerate the same population CPython does. pub fn promote_all_deferred(&self) { + self.flush_young(); self.sweep_deferred(true); } @@ -882,114 +1035,174 @@ impl GcState { } } - /// Enter `obj` in the index and generation 0 (`false`: it was already + /// Enter `obj` in the registry's generation 0 (`false`: it was already /// there, or has no heap allocation of its own). A `fresh` object's id /// may be a finalized one's, recycled; a young instance's own /// finalizer may already have run, and its entry says so. fn register(&self, obj: &Object, fresh: bool) -> bool { - let new_id = id_of(obj); { - let mut index = self.index.borrow_mut(); + let mut reg = self.reg.borrow_mut(); // An entry whose object died can't sit at this address: its // weak handle keeps the allocation reserved until the entry is // pruned. - if index.contains(&new_id) { + if reg.slot_of(obj, &self.tracked_filter).is_some() { return false; } - let Some(handle) = TrackedHandle::new(obj, 0) else { + let Some(weak) = WeakObject::new(obj) else { return false; }; - let handle = HandleRc::new(handle); - // A generator remembers it has an index entry, which its - // finishing release then removes (see `release_finished_gen`). - if let Object::Generator(g) | Object::Coroutine(g) | Object::AsyncGenerator(g) = obj { - g.gc_registered.set(true); - } - // Publish to the miss-filter *before* the insert becomes - // observable (we hold the index borrow). - self.tracked_filter.insert(new_id); - index.insert(IndexEntry(handle.clone())); - // `finalized_ids` is keyed by object id (a pointer), which the - // allocator recycles. A freshly tracked object at a recycled - // address must start *un*-finalized (`test_is_finalized`). - // Almost always empty (only `__del__`-bearing objects ever land - // there). - if !self.finalized_ids.borrow().is_empty() { - if fresh { - self.finalized_ids.borrow_mut().remove(&new_id); - } else if self.finalized_ids.borrow().contains(&new_id) { - handle.finalized.store(true, Ordering::Release); - } - } - let mut gens = self.generations.borrow_mut(); - handle.slot.store(gens[0].handles.len(), Ordering::Release); - gens[0].handles.push(handle); + // SAFETY: `obj` is alive. + unsafe { self.enter(&mut reg, weak, fresh) }; } serial_add(&self.tracked_count, 1); serial_add(&self.tracked_version, 1); true } - /// Drop the registry entry of a registered object that just died, if - /// the registry is free to change: its weak handle otherwise keeps the - /// object's allocation alive until a collection of its generation - /// prunes it (CPython unlinks a dying object from its GC list at - /// once). A busy registry (a collection is releasing garbage) is left - /// as it is; that collection prunes the entry. - fn forget_dead(&self, id: ObjectId) { - let (Ok(mut index), Ok(mut counts), Ok(mut gens)) = ( - self.index.try_borrow_mut(), - self.counts.try_borrow_mut(), - self.generations.try_borrow_mut(), - ) else { - return; - }; - let Some(IndexEntry(handle)) = index.get(&id) else { + /// Enter the object `weak` names, which is alive and unregistered, in + /// generation 0. + /// + /// # Safety + /// + /// The object must be alive. + unsafe fn enter(&self, reg: &mut Registry, weak: WeakObject, fresh: bool) -> u32 { + let key = weak.addr() as ObjectId; + // `finalized_ids` is keyed by object id (a pointer), which the + // allocator recycles. A freshly tracked object at a recycled + // address must start *un*-finalized (`test_is_finalized`). Almost + // always empty (only `__del__`-bearing objects ever land there). + let mut flags = 0; + // SAFETY: a read that runs no code. + if unsafe { self.finalized_ids.peek() }.is_none_or(|f| !f.is_empty()) { + if fresh { + self.finalized_ids.borrow_mut().remove(&key); + } else if self.finalized_ids.borrow().contains(&key) { + flags = F_FINALIZED; + } + } + // (A pointer: the field lives in the object, not the handle, which + // moves into the registry below.) + // SAFETY: alive, per the caller. + let own = unsafe { weak_intrusive_slot(&weak) }.map(std::ptr::from_ref); + if own.is_none() { + // Publish to the miss-filter *before* the insert becomes + // observable (the caller holds the registry borrow). + self.tracked_filter.insert(key); + } + // (Registered other than through `track`, which retires the + // deferral itself.) + if let WeakObject::Instance(w) = &weak { + // SAFETY: alive, per the caller. + let i = unsafe { &*w.as_ptr() }; + if i.is_gc_deferred() { + i.clear_deferred_tracking(); + } + } + let slot = reg.insert(weak, 0, flags); + match own { + // SAFETY: the object is alive, per the caller. + Some(cell) => unsafe { (*cell).set(slot) }, + None => { + reg.index.insert(key, slot); + } + } + slot + } + + /// Register the young objects of `set` still alive (see + /// [`Self::young`]) under one registry borrow, keeping the set's + /// allocation for the next generation of young. + fn flush_set( + &self, + set: &RefCell>>, + wrap: fn(crate::sync::Weak) -> WeakObject, + ) { + let Ok(mut young) = set.try_borrow_mut() else { return; }; - if !handle.object.is_dead() || handle.color.load(Ordering::Acquire) == color::Frozen { + if young.is_empty() { return; } - let IndexEntry(handle) = index.take(&id).expect("probed above"); - let g = usize::from( - handle - .generation - .load(Ordering::Acquire) - .min(MAX_GENERATION), - ); - let slot = handle.slot.load(Ordering::Acquire); - let removed = if gens[g] - .handles - .get(slot) - .is_some_and(|h| HandleRc::ptr_eq(h, &handle)) + let mut added = 0; { - swap_remove_handle(&mut gens[g].handles, slot); - true - } else { - remove_handle_by_ptr(&mut gens[g].handles, &handle) + let mut reg = self.reg.borrow_mut(); + for w in young.drain(..) { + if w.strong_count() == 0 { + continue; + } + let weak = wrap(w); + // SAFETY (both): the object is alive (counted above, and + // nothing has run since). + let registered = match unsafe { weak_intrusive_slot(&weak) } { + Some(own) => own.is_registered(), + None => { + let key = weak.addr() as ObjectId; + self.tracked_filter.may_contain(key) && reg.index.contains_key(&key) + } + }; + if !registered { + unsafe { self.enter(&mut reg, weak, false) }; + added += 1; + } + } + } + if added > 0 { + serial_add(&self.tracked_count, added); + serial_add(&self.tracked_version, 1); + } + } + + /// Drop the registry entry of an instance that is dying (from its + /// `Drop`, with its `gc_slot` and address), if the registry is free to + /// change: its weak handle otherwise keeps the object's allocation + /// alive until a collection of its generation prunes it (CPython + /// unlinks a dying object from its GC list at once). A busy registry + /// (a collection is releasing garbage) is left as it is; that + /// collection prunes the entry. + fn forget_instance(&self, slot: u32, addr: usize) { + let (Ok(mut reg), Ok(mut counts)) = + (self.reg.try_borrow_mut(), self.counts.try_borrow_mut()) + else { + return; }; - if !removed { - // Somewhere unexpected: leave it to the collector. - index.insert(IndexEntry(handle)); + let Some(e) = reg.slab.get(slot as usize) else { return; + }; + match &e.obj { + Some(WeakObject::Instance(w)) if w.as_ptr() as usize == addr => {} + _ => return, } - // (As `untrack_id_in` accounts it.) + if e.gen == GEN_FROZEN { + return; + } + let weak = reg.remove(slot); + // (As `untrack_slot` accounts it.) counts[0] = counts[0].saturating_sub(1); self.sync_gen0_gauge(counts[0], None); - drop((index, counts, gens)); + drop((reg, counts)); serial_add(&self.tracked_count, usize::MAX); serial_add(&self.tracked_version, 1); - drop(handle); + drop(weak); } /// Stop tracking `obj`. Backs the explicit `gc._untrack(obj)` extension /// and the C-API `PyObject_GC_UnTrack`. + pub fn untrack(&self, obj: &Object) { + let slot = self.reg.borrow().slot_of(obj, &self.tracked_filter); + match slot { + Some(slot) => self.untrack_slot(slot, id_of(obj), true), + None => self.untrack_young(id_of(obj)), + } + } + + /// [`Self::untrack`] by id, for an object that isn't an instance. pub fn untrack_id(&self, id: ObjectId) { self.untrack_id_in(id, true); } - /// [`Self::untrack_id`]; with `young` false, an object in a young set - /// is left there (see [`untrack_registered_id`]). + /// Stop tracking the object of id `id`, which isn't an instance; + /// with `young` false, an object in a young set is left there (see + /// [`untrack_registered_id`]). fn untrack_id_in(&self, id: ObjectId, young: bool) { // A registered object is never in a young set, so the index (a // hash probe) answers first; the young sets are scanned only for @@ -998,14 +1211,28 @@ impl GcState { // `YOUNG_CAP` entries.) An index entry left by a dead object // whose address a young one now reuses is dropped, and the young // sets still searched. - let indexed = self.index.borrow_mut().take(&id); - let Some(IndexEntry(handle)) = indexed else { - if young { - self.untrack_young(id); - } - return; + let slot = if self.tracked_filter.may_contain(id) { + self.reg.borrow().index.get(&id).copied() + } else { + None + }; + match slot { + Some(slot) => self.untrack_slot(slot, id, young), + None if young => self.untrack_young(id), + None => {} + } + } + + /// Remove the entry at `slot` (an object of id `id`), accounting it as + /// a deallocation; with `young`, a dead entry's id is also searched in + /// the young sets. + fn untrack_slot(&self, slot: u32, id: ObjectId, young: bool) { + let (weak, dead) = { + let mut reg = self.reg.borrow_mut(); + let dead = reg.entry(slot).obj.as_ref().is_none_or(WeakObject::is_dead); + (reg.remove(slot), dead) }; - if young && handle.object.is_dead() { + if young && dead { self.untrack_young(id); } { @@ -1013,43 +1240,7 @@ impl GcState { counts[0] = counts[0].saturating_sub(1); self.sync_gen0_gauge(counts[0], None); } - // O(1) removal via the handle's cached `slot`. The cached position is - // only valid under the owning vector's lock; fall back to a pointer - // search if it's stale. - if handle.color.load(Ordering::Acquire) == color::Frozen { - let mut frozen = self.frozen.borrow_mut(); - let slot = handle.slot.load(Ordering::Acquire); - if frozen - .get(slot) - .is_some_and(|h| HandleRc::ptr_eq(h, &handle)) - { - swap_remove_handle(&mut frozen, slot); - } else { - remove_handle_by_ptr(&mut frozen, &handle); - } - } else { - let mut gens = self.generations.borrow_mut(); - let g = usize::from( - handle - .generation - .load(Ordering::Acquire) - .min(MAX_GENERATION), - ); - let slot = handle.slot.load(Ordering::Acquire); - if gens[g] - .handles - .get(slot) - .is_some_and(|h| HandleRc::ptr_eq(h, &handle)) - { - swap_remove_handle(&mut gens[g].handles, slot); - } else if !remove_handle_by_ptr(&mut gens[g].handles, &handle) { - for gg in 0..N_GENERATIONS { - if gg != g && remove_handle_by_ptr(&mut gens[gg].handles, &handle) { - break; - } - } - } - } + drop(weak); serial_add(&self.tracked_count, usize::MAX); serial_add(&self.tracked_version, 1); } @@ -1084,29 +1275,29 @@ impl GcState { } } - /// Drop the entries of objects that have died from `handles`, and from - /// the index; `budget` caps how many entries are examined, starting at - /// `start` (wrapping). Returns how many were dropped and where the + /// Drop the entries of objects that have died from generation `gen`; + /// `budget` caps how many entries are examined, starting at `start` + /// (wrapping). Returns how many were dropped and where the /// examination stopped. - // (An `IndexEntry` hashes and compares by its handle's immutable id.) - #[allow(clippy::mutable_key_type)] fn prune_dead_in( - index: &mut GcIndex, - handles: &mut Vec>, + reg: &mut Registry, + gen: usize, start: usize, budget: usize, ) -> (usize, usize) { let mut removed = 0; - let mut i = if start < handles.len() { start } else { 0 }; + let mut i = if start < reg.gens[gen].len() { + start + } else { + 0 + }; let mut examined = 0; - while examined < budget && i < handles.len() { + while examined < budget && i < reg.gens[gen].len() { examined += 1; - if handles[i].object.is_dead() { - let h = handles.swap_remove(i); - index.remove(&h.id); - if let Some(moved) = handles.get(i) { - moved.slot.store(i, Ordering::Release); - } + let slot = reg.gens[gen][i]; + if reg.entry(slot).obj.as_ref().is_none_or(WeakObject::is_dead) { + // (The swap brings the list's last member to `i`.) + drop(reg.remove(slot)); removed += 1; } else { i += 1; @@ -1120,36 +1311,33 @@ impl GcState { /// Returns the young generation's live population. fn prune(&self, old_budget: usize) -> usize { let (removed, live) = { - let mut index = self.index.borrow_mut(); - let mut gens = self.generations.borrow_mut(); - let (mut removed, _) = - Self::prune_dead_in(&mut index, &mut gens[0].handles, 0, usize::MAX); + let mut reg = self.reg.borrow_mut(); + let (mut removed, _) = Self::prune_dead_in(&mut reg, 0, 0, usize::MAX); // The older generations, a slice at a time: the cursor runs // over gen 1 then gen 2 as one sequence. let cursor = self.old_prune_cursor.load(Ordering::Relaxed); - let n1 = gens[1].handles.len(); + let n1 = reg.gens[1].len(); let (g, start) = if cursor < n1 { (1, cursor) } else { (2, cursor - n1) }; - let (r, stop) = - Self::prune_dead_in(&mut index, &mut gens[g].handles, start, old_budget); + let (r, stop) = Self::prune_dead_in(&mut reg, g, start, old_budget); removed += r; self.old_deaths.fetch_add(r, Ordering::Relaxed); - let next = if stop >= gens[g].handles.len() { + let next = if stop >= reg.gens[g].len() { if g == 1 { - gens[1].handles.len() + reg.gens[1].len() } else { 0 } } else if g == 1 { stop } else { - gens[1].handles.len() + stop + reg.gens[1].len() + stop }; self.old_prune_cursor.store(next, Ordering::Relaxed); - (removed, gens[0].handles.len()) + (removed, reg.gens[0].len()) }; if removed > 0 { self.tracked_count.fetch_sub( @@ -1161,52 +1349,54 @@ impl GcState { live } + /// Whether the object of id `id` is registered. Only for a kind the id + /// index holds (not an instance: see [`Self::is_tracked_obj`]). pub fn is_tracked(&self, id: ObjectId) -> bool { - // Usually-miss probe: two relaxed loads instead of the index + // Usually-miss probe: two relaxed loads instead of the registry // borrow. A stale filter bit just takes the precise path. if !self.tracked_filter.may_contain(id) { return false; } - self.index.borrow().contains(&id) + self.reg.borrow().index.contains_key(&id) } - /// [`Self::is_tracked`] for an object that may be young (an instance, - /// function, generator, list or dict). - pub fn is_tracked_instance(&self, id: ObjectId) -> bool { - self.is_tracked(id) || self.is_young(id) + /// Whether `obj` is registered. + pub fn is_tracked_obj(&self, obj: &Object) -> bool { + self.reg + .borrow() + .slot_of(obj, &self.tracked_filter) + .is_some() } - /// O(1) handle lookup by object id (any generation or frozen). - pub fn handle_for(&self, id: ObjectId) -> Option> { - if !self.tracked_filter.may_contain(id) { - return None; - } - self.index.borrow().get(&id).map(|e| e.0.clone()) + /// [`Self::is_tracked_obj`] for an object that may be young (an + /// instance, function, generator, list or dict). + pub fn is_tracked_instance(&self, obj: &Object) -> bool { + self.is_tracked_obj(obj) || self.is_young(id_of(obj)) } /// Snapshot every live tracked object that still carries an unrun /// `__del__`. The interpreter's shutdown pass walks this list to - /// finalize objects that are still alive at exit. The per-handle - /// `finalized` flag guarantees each `__del__` runs at most once. - pub fn finalization_candidates(&self) -> Vec<(HandleRc, Object)> { + /// finalize objects that are still alive at exit; it claims each one + /// through [`Self::claim_finalizer`], so each `__del__` runs at most + /// once. + pub fn finalization_candidates(&self) -> Vec { self.flush_young(); + let reg = self.reg.borrow(); let mut out = Vec::new(); - let mut consider = |h: &HandleRc| { + let lists = reg.gens.iter().chain(std::iter::once(®.frozen)); + for &slot in lists.flatten() { + let e = reg.entry(slot); // A finalizer already queued by a collection (but not yet // drained) must not be listed again. - if h.finalized.load(Ordering::Acquire) || h.finalize_queued.load(Ordering::Acquire) { - return; + if e.has(F_FINALIZED) || e.has(F_QUEUED) { + continue; } - if let Some(obj) = h.object.upgrade() { + if let Some(obj) = e.obj.as_ref().and_then(WeakObject::upgrade) { if has_finalizer(&obj) { - out.push((h.clone(), obj)); + out.push(obj); } } - }; - for gen in self.generations.borrow().iter() { - gen.handles.iter().for_each(&mut consider); } - self.frozen.borrow().iter().for_each(&mut consider); out } @@ -1273,6 +1463,23 @@ impl GcState { } } + /// [`Self::note_gen0_alloc`] of `n` allocations at once. + fn note_gen0_allocs(&self, n: usize) { + let before = { + let mut counts = self.counts.borrow_mut(); + let before = counts[0]; + counts[0] = counts[0].saturating_add(n); + self.sync_gen0_gauge(counts[0], None); + before + }; + let gauge = self.gen0_gauge.load(Ordering::Relaxed); + let threshold = (gauge & 0xffff_ffff) as usize; + let now = (gauge >> 32) as usize; + if threshold != 0 && before < threshold && now >= threshold && self.is_enabled() { + crate::hot_gates::set(crate::hot_gates::GC_DUE); + } + } + /// Republish the gen-0 gauge after a write to `counts[0]` or /// `thresholds[0]` (see the field docs). #[inline] @@ -1383,12 +1590,7 @@ impl GcState { /// Total population (across all generations + frozen). pub fn population(&self) -> usize { self.flush_young(); - let gens = self.generations.borrow(); - let mut n = 0; - for g in gens.iter() { - n += g.handles.len(); - } - n + self.frozen.borrow().len() + self.reg.borrow().len() } /// Snapshot all live tracked objects. Used by @@ -1397,17 +1599,17 @@ impl GcState { // `gc.get_objects()` enumerates every container CPython tracks, // including the all-scalar ones whose tracking we defer. self.promote_all_deferred(); - let gens = self.generations.borrow(); + let reg = self.reg.borrow(); let mut out = Vec::new(); - let mut push = |h: &HandleRc| out.extend(h.object.upgrade()); + let mut push = |s: &u32| { + out.extend(reg.entry(*s).obj.as_ref().and_then(WeakObject::upgrade)); + }; match generation { - Some(g) if g < N_GENERATIONS => gens[g].handles.iter().for_each(&mut push), - _ => gens - .iter() - .for_each(|g| g.handles.iter().for_each(&mut push)), + Some(g) if g < N_GENERATIONS => reg.gens[g].iter().for_each(&mut push), + _ => reg.gens.iter().for_each(|g| g.iter().for_each(&mut push)), } if generation.is_none() { - self.frozen.borrow().iter().for_each(&mut push); + reg.frozen.iter().for_each(&mut push); } out } @@ -1416,13 +1618,14 @@ impl GcState { /// frozen so it is ignored by future collections. pub fn freeze_all(&self) { self.flush_young(); - let mut gens = self.generations.borrow_mut(); - let mut frozen = self.frozen.borrow_mut(); - for g in gens.iter_mut() { - for h in g.handles.drain(..) { - h.color.store(color::Frozen, Ordering::Release); - h.slot.store(frozen.len(), Ordering::Release); - frozen.push(h); + let mut reg = self.reg.borrow_mut(); + for g in 0..N_GENERATIONS { + for slot in std::mem::take(&mut reg.gens[g]) { + let pos = reg.frozen.len() as u32; + let e = &mut reg.slab[slot as usize]; + e.gen = GEN_FROZEN; + e.pos = pos; + reg.frozen.push(slot); } } self.tracked_version.fetch_add(1, Ordering::AcqRel); @@ -1431,20 +1634,19 @@ impl GcState { /// `gc.unfreeze()` — move every frozen object back to /// generation 0. pub fn unfreeze_all(&self) { - // Lock order: generations before frozen, matching `freeze_all`. - let mut gens = self.generations.borrow_mut(); - let mut frozen = self.frozen.borrow_mut(); - for h in frozen.drain(..) { - h.color.store(color::White, Ordering::Release); - h.generation.store(0, Ordering::Release); - h.slot.store(gens[0].handles.len(), Ordering::Release); - gens[0].handles.push(h); + let mut reg = self.reg.borrow_mut(); + for slot in std::mem::take(&mut reg.frozen) { + let pos = reg.gens[0].len() as u32; + let e = &mut reg.slab[slot as usize]; + e.gen = 0; + e.pos = pos; + reg.gens[0].push(slot); } self.tracked_version.fetch_add(1, Ordering::AcqRel); } pub fn freeze_count(&self) -> usize { - self.frozen.borrow().len() + self.reg.borrow().frozen.len() } /// Collect generations `0..=upto`. Returns the number of @@ -1464,6 +1666,7 @@ impl GcState { /// *without* the destructive teardown of a real collection. See /// [`Self::collect_generation`]'s `weakref_only` discussion. pub fn fire_dead_weakrefs(&self) { + self.flush_young(); self.sweep_deferred_from(false, true); if self .collecting @@ -1492,6 +1695,7 @@ impl GcState { // the mark phase sees the whole candidate population (the old // deferrals only for the older generations). Before the // re-entrancy claim: promotion calls `track_now`. + self.flush_young(); self.sweep_deferred_from(false, upto >= 1); // Atomic claim: overlapping collections over the shared heap would // subtract the same internal edges twice. @@ -1544,10 +1748,16 @@ impl GcState { self.sync_gen0_gauge(counts[0], None); } // The tracked-id filter only ever gains bits; once most of them - // name objects long gone, rebuild it from the live index. - let live = self.index.borrow().len(); + // name objects long gone, rebuild it from the live index (sooner + // after a full collection, which finds the most dead). + let live = self.reg.borrow().index.len(); let stale = self.tracked_filter.inserts_since_rebuild(); - if gen == N_GENERATIONS - 1 || stale > 4096.max(live.saturating_mul(4)) { + let bound = if gen == N_GENERATIONS - 1 { + live + } else { + live.saturating_mul(4) + }; + if stale > 4096.max(bound) { self.rebuild_tracked_filter(); } self.collecting.store(false, Ordering::Release); @@ -1560,8 +1770,8 @@ impl GcState { /// Rebuild the tracked-id miss filter from the live index. Holding the /// index borrow serializes it against every `track`. pub fn rebuild_tracked_filter(&self) { - let index = self.index.borrow(); - self.tracked_filter.rebuild(index.iter().map(|e| e.0.id)); + let reg = self.reg.borrow(); + self.tracked_filter.rebuild(reg.index.keys().copied()); } /// Collect a specific generation. Used by [`Self::collect`]. @@ -1574,15 +1784,24 @@ impl GcState { /// `weakref_cb` without the destructive teardown of a full collection /// (RFC 0040: `test_shutdown`). fn collect_generation(&self, gen: usize, weakref_only: bool) -> usize { - // Phase 1: the live objects of this generation and the younger ones, - // each held strongly for the collection's duration. Entries whose - // object died are dropped on the way. - let mut cands = self.snapshot_for_collection(gen); - let n_real = cands.len(); - if n_real == 0 { + let gen = gen.min(N_GENERATIONS - 1); + // Phase 1: mark the live entries of this generation and the + // younger ones as candidates. Entries whose object died are dropped + // on the way. The candidates are the generation lists themselves, + // and each one's marking state lives in its entry (as CPython's + // lives in the object's header): the collection takes no reference + // and makes no copy per candidate. + if self.mark_candidates(gen) == 0 { return 0; } - let mut by_id: GcIdMap = cands.iter().enumerate().map(|(i, c)| (c.id, i)).collect(); + // Temporary candidates, and their positions by id. + let mut temps: Vec = Vec::new(); + + // The registry can't change while the mark phase reads it: no code + // runs, and a dying object's own removal finds it busy. + let reg = self.reg.borrow(); + let finder = Finder::new(®, &self.tracked_filter); + let lists = ®.gens[..=gen]; // Phase 2: one walk over the candidates promotes the untracked nodes // reachable from them to temporary candidates for this pass only, @@ -1594,97 +1813,207 @@ impl GcState { // internal edges are accounted. A temporary is a candidate from its // first edge on, so each of its edges is tallied too. Temporaries // take part in the mark walk but are never reclaimed or tracked. - let mut scanned = 0usize; + // + // The walk also records each candidate's edges to candidates (a + // node per registered candidate, in list order, then one per + // temporary), so marking what is reachable follows those instead of + // walking every object a second time. let mut found: Vec = Vec::new(); - while scanned < cands.len() { - let parent_is_iter = matches!(cands[scanned].obj, Object::Iter(_)); - let parent_is_frame = matches!(cands[scanned].obj, Object::Frame(_)); - traverse_object(&cands[scanned].obj, &mut |child| { - if child.never_gc_candidate() { - return; - } - if let Some(&i) = by_id.get(&id_of(child)) { - let t = &cands[i]; + let mut edges: Vec = Vec::new(); + let mut starts: Vec = Vec::new(); + let tally = + |obj: &Object, temps: &mut Vec, found: &mut Vec, edges: &mut Vec| { + let parent_is_iter = matches!(obj, Object::Iter(_)); + let parent_is_frame = matches!(obj, Object::Frame(_)); + traverse_collected(obj, &mut |child| { + if child.never_gc_candidate() { + return; + } + match finder.find(child) { + Some(Hit::Real(s)) => { + let e = reg.entry(s); + e.gc_refs.set(e.gc_refs.get().wrapping_sub(1)); + edges.push(s); + } + Some(Hit::Temp(i)) => { + let t = &temps[i as usize]; + t.gc_refs.set(t.gc_refs.get() - 1); + edges.push(i | TEMP_BIT); + } + None => { + if promotes_temporarily(child, parent_is_iter, parent_is_frame) { + found.push(child.clone()); + } + } + } + }); + // (One entry per edge: a node reached twice is promoted once and + // tallied twice.) + for child in found.drain(..) { + let i = match finder.find(&child) { + Some(Hit::Temp(i)) => i as usize, + Some(Hit::Real(s)) => { + let e = reg.entry(s); + e.gc_refs.set(e.gc_refs.get().wrapping_sub(1)); + edges.push(s); + continue; + } + None => { + finder.add_temp(&child, temps.len()); + temps.push(Temp { + obj: child, + gc_refs: std::cell::Cell::new(0), + reached: std::cell::Cell::new(false), + }); + temps.len() - 1 + } + }; + let t = &temps[i]; t.gc_refs.set(t.gc_refs.get() - 1); - } else if promotes_temporarily(child, parent_is_iter, parent_is_frame) { - found.push(child.clone()); + edges.push(i as u32 | TEMP_BIT); } - }); - // (One entry per edge: a node reached twice is promoted once and - // tallied twice.) - for child in found.drain(..) { - let cid = id_of(&child); - let i = match by_id.entry(cid) { - std::collections::hash_map::Entry::Vacant(e) => { - e.insert(cands.len()); - cands.push(Cand::new(child, cid, None)); - cands.len() - 1 - } - std::collections::hash_map::Entry::Occupied(e) => *e.get(), - }; - let t = &cands[i]; - t.gc_refs.set(t.gc_refs.get() - 1); - } + }; + for &slot in lists.iter().flatten() { + let e = reg.entry(slot); + e.node.set(starts.len() as u32); + starts.push(edges.len() as u32); + // SAFETY: the mark walk runs no code that could release the + // object (see `traverse_collected`). + unsafe { + e.obj.as_ref().and_then(|w| { + w.with_borrowed(|obj| tally(obj, &mut temps, &mut found, &mut edges)) + }); + } + } + let n_real = starts.len(); + let mut scanned = 0; + while scanned < temps.len() { + starts.push(edges.len() as u32); + let obj = temps[scanned].obj.clone(); + tally(&obj, &mut temps, &mut found, &mut edges); scanned += 1; } + starts.push(edges.len() as u32); + let graph = Graph { + reg: ®, + temps: &temps, + edges: &edges, + starts: &starts, + n_real, + }; // Phase 3: add the outer refcount, read after the walk (an iterator // synthesises a fresh wrapper for its buffer on each traverse, alive - // only during the visit). Each candidate holds one reference of its + // only during the visit). A temporary holds one reference of its // own. - for c in &cands { - c.gc_refs - .set(strong_count_for(&c.obj) as i64 - 1 + c.gc_refs.get()); - } - - // Phase 4: anything with gc_refs > 0 is reachable from outside; mark - // it black and propagate. - let mut grey: Vec = Vec::new(); - for (i, c) in cands.iter().enumerate() { - if c.gc_refs.get() > 0 { - c.color.set(color::Grey); - grey.push(i); + let mut grey: Vec = Vec::new(); + for &slot in lists.iter().flatten() { + let e = reg.entry(slot); + let strong = e.obj.as_ref().map_or(0, WeakObject::strong_count); + let refs = i64::from(e.gc_refs.get()) + strong as i64; + e.gc_refs + .set(refs.clamp(i64::from(i32::MIN), i64::from(i32::MAX)) as i32); + // Phase 4: anything referenced from outside is reachable; mark + // it and propagate. + if refs > 0 { + e.set(F_REACHED, true); + grey.push(slot); + } + } + for (i, t) in temps.iter().enumerate() { + t.gc_refs + .set(strong_count_for(&t.obj) as i64 - 1 + t.gc_refs.get()); + if t.gc_refs.get() > 0 { + t.reached.set(true); + grey.push(i as u32 | TEMP_BIT); } } if root_debug() { - for &i in &grey { - let c = &cands[i]; - eprintln!( - "[root] id={} gc_refs={} sc={} {}", - c.id, - c.gc_refs.get(), - strong_count_for(&c.obj), - c.obj.type_name_owned() - ); + for &g in &grey { + if g & TEMP_BIT == 0 { + let e = reg.entry(g); + eprintln!( + "[root] slot={} gc_refs={} sc={}", + g, + e.gc_refs.get(), + e.obj.as_ref().map_or(0, WeakObject::strong_count) + ); + } else { + let t = &temps[(g & !TEMP_BIT) as usize]; + eprintln!( + "[root] temp gc_refs={} {}", + t.gc_refs.get(), + t.obj.type_name_owned() + ); + } + } + } + if stats_debug() { + let mut kinds = std::collections::BTreeMap::::default(); + for t in &temps { + *kinds.entry(t.obj.type_name_owned()).or_default() += 1; } + eprintln!( + "[gc] gen={} cands={} roots={} temps={} {:?}", + gen, + lists.iter().map(Vec::len).sum::(), + grey.len(), + temps.len(), + kinds + ); } - Self::propagate_black(&cands, &by_id, &mut grey); + graph.propagate(&mut grey); - // Phase 5: white real candidates are unreachable cyclic garbage. - let unreachable: Vec = (0..n_real).filter(|&i| cands[i].is_white()).collect(); + // Phase 5: the candidates still unreached are unreachable cyclic + // garbage; hold each for the rest of the collection. + let mut unreachable: Vec<(u32, Object)> = Vec::new(); + for &slot in lists.iter().flatten() { + let e = reg.entry(slot); + if !e.has(F_REACHED) { + if let Some(obj) = e.obj.as_ref().and_then(WeakObject::upgrade) { + unreachable.push((slot, obj)); + } + } + } // CPython's `handle_weakrefs`: a weakref that is *itself* part of the // cyclic trash has its callback cleared without invocation — only // weakrefs rooted outside the dying subgraph observe the deaths // (test_callbacks_on_callback). - let trash_ids: IdSet = unreachable.iter().map(|&i| cands[i].id).collect(); + // (Built only for a collection whose garbage was weakly referenced.) + let trash_ids: std::cell::OnceCell = std::cell::OnceCell::new(); + let is_trash = |id: ObjectId| { + trash_ids + .get_or_init(|| unreachable.iter().map(|(_, o)| id_of(o)).collect()) + .contains(&id) + }; let wrapper_is_trash = |slot: &crate::sync::Rc| { slot.py_ref .borrow() .as_ref() .and_then(crate::sync::Weak::upgrade) - .is_none_or(|inst| { - trash_ids.contains(&(crate::sync::Rc::as_ptr(&inst) as usize as u64)) - }) + .is_none_or(|inst| is_trash(crate::sync::Rc::as_ptr(&inst) as usize as u64)) + }; + // The weakrefs to `obj`, cleared (a lock-free probe answers for an + // object never weakly referenced). + let notify_clear = |obj: &Object| { + let id = id_of(obj); + if crate::weakref_registry::may_have_weakrefs(id) { + crate::weakref_registry::notify_clear(id) + } else { + Vec::new() + } }; + let pending_finalizer = + |slot: u32, obj: &Object| has_finalizer(obj) && !reg.entry(slot).has(F_FINALIZED); if weakref_only { let mut weakref_callbacks = Vec::new(); - for &i in &unreachable { - if cands[i].pending_finalizer() { + for (slot, obj) in &unreachable { + if pending_finalizer(*slot, obj) { continue; } - for (slot, cb) in crate::weakref_registry::notify_clear(cands[i].id) { + for (slot, cb) in notify_clear(obj) { if let Some(cb) = cb { if !wrapper_is_trash(&slot) { weakref_callbacks.push((slot, cb)); @@ -1692,7 +2021,13 @@ impl GcState { } } } + for &slot in lists.iter().flatten() { + let e = reg.entry(slot); + e.set(F_CAND | F_REACHED, false); + } + drop(reg); queue_weakref_callbacks(weakref_callbacks, |_| false); + drop(unreachable); return 0; } @@ -1701,8 +2036,8 @@ impl GcState { // watching an object a finalizer later revives stays cleared // (`test_io.test_garbage_collection`). let mut weakref_callbacks = Vec::new(); - for &i in &unreachable { - for (slot, cb) in crate::weakref_registry::notify_clear(cands[i].id) { + for (_, obj) in &unreachable { + for (slot, cb) in notify_clear(obj) { if let Some(cb) = cb { if !wrapper_is_trash(&slot) { weakref_callbacks.push((slot, cb)); @@ -1716,169 +2051,372 @@ impl GcState { // the collection) may resurrect them, and CPython only counts // objects it actually reclaims. The next collection, by which point // the finalizer has set `finalized`, reclaims the ones it didn't. - let (deferred, maybe_dead): (Vec, Vec) = unreachable - .iter() - .partition(|&&i| cands[i].pending_finalizer()); - for &i in &deferred { - if let Some(e) = &cands[i].entry { - if !e.finalize_queued.swap(true, Ordering::AcqRel) { - run_finalizer(&cands[i].obj); - } - } - } // CPython runs `finalize_garbage` before `delete_garbage`, so a // pending finalizer always sees its own class, closure cells, and // referents intact: protect the deferred objects' whole subgraphs. - let mut protect: Vec = Vec::new(); - for &i in &deferred { - cands[i].color.set(color::Grey); - protect.push(i); + let mut protect: Vec = Vec::new(); + for (slot, obj) in &unreachable { + if pending_finalizer(*slot, obj) { + let e = reg.entry(*slot); + if !e.has(F_QUEUED) { + e.set(F_QUEUED, true); + run_finalizer(obj); + } + e.set(F_REACHED, true); + protect.push(*slot); + } } - Self::propagate_black(&cands, &by_id, &mut protect); + graph.propagate(&mut protect); - let dead: Vec = maybe_dead - .into_iter() - .filter(|&i| cands[i].is_white()) + let dead: Vec = unreachable + .iter() + .filter(|(slot, _)| !reg.entry(*slot).has(F_REACHED)) + .map(|(_, obj)| obj.clone()) .collect(); let collected = dead.len(); // Temporarily promoted iterators and immutable containers that ended - // up white are cyclic garbage too, freed by refcount once the cycle's - // mutable anchor is cleared below. CPython counts each (`test_tuple` - // asserts the closing tuple is counted alongside its list). + // up unreached are cyclic garbage too, freed by refcount once the + // cycle's mutable anchor is cleared below. CPython counts each + // (`test_tuple` asserts the closing tuple is counted alongside its + // list). let reported = collected - + cands[n_real..] + + temps .iter() - .filter(|c| { - c.is_white() + .filter(|t| { + !t.reached.get() && matches!( - c.obj, + t.obj, Object::Iter(_) | Object::Tuple(_) | Object::FrozenSet(_) ) }) .count(); + // The clears below release objects, whose removal from the registry + // must find it free. + drop(reg); // Break the cycles by clearing the reclaimed objects' fields — or, // under `gc.DEBUG_SAVEALL`, park them in `gc.garbage` intact. if self.debug.load(Ordering::Acquire) & DEBUG_SAVEALL != 0 { let mut garbage = self.garbage.borrow_mut(); - for &i in &dead { - garbage.push(cands[i].obj.clone()); + for obj in &dead { + garbage.push(obj.clone()); } } else { // Instances whose `__dict__` is shared are deferred; once every // other dead object has released its references, a dict held // only by dead holders is down to one owner and the retry // clears it (a live holder keeps it intact). - let mut shared_dict_holders: Vec = Vec::new(); - for &i in &dead { - if !clear_object_fields(&cands[i].obj) { - shared_dict_holders.push(i); + let mut shared_dict_holders: Vec<&Object> = Vec::new(); + for obj in &dead { + if !clear_object_fields(obj) { + shared_dict_holders.push(obj); } } - for i in shared_dict_holders { - clear_object_fields(&cands[i].obj); + for obj in shared_dict_holders { + clear_object_fields(obj); } } // Queue the weakref callbacks (after finalisers and cyclic clears, // matching CPython's order) for the interpreter's next safe point. - queue_weakref_callbacks(weakref_callbacks, |slot| { - slot.py_ref - .borrow() - .as_ref() - .and_then(crate::sync::Weak::upgrade) - .is_none_or(|inst| { - trash_ids.contains(&(crate::sync::Rc::as_ptr(&inst) as usize as u64)) - }) - }); + queue_weakref_callbacks(weakref_callbacks, wrapper_is_trash); // Phase 6: rebuild the generation lists. Survivors of generation // `g` move to generation min(g+1, N_GENERATIONS-1); the dead leave - // the index. Dropping `cands` then frees the dead by refcount. - self.rebuild_generations(gen, &cands[..n_real]); + // the registry. Dropping the held objects then frees the dead by + // refcount. + self.rebuild_generations(gen); self.tracked_count.fetch_sub( collected.min(self.tracked_count.load(Ordering::Acquire)), Ordering::AcqRel, ); self.tracked_version.fetch_add(1, Ordering::AcqRel); - drop(cands); + drop(dead); + drop(unreachable); + drop(temps); reported } - /// Blacken everything reachable from the grey candidates in `grey`. - fn propagate_black(cands: &[Cand], by_id: &GcIdMap, grey: &mut Vec) { - while let Some(i) = grey.pop() { - cands[i].color.set(color::Black); - traverse_object(&cands[i].obj, &mut |child| { - if child.never_gc_candidate() { - return; + /// Mark the live entries of generations `0..=upto` as candidates of a + /// collection, dropping the entries whose object died. Returns how + /// many there are. + fn mark_candidates(&self, upto: usize) -> usize { + let mut reg = self.reg.borrow_mut(); + let mut dead = Vec::new(); + let mut n = 0; + for g in 0..=upto { + let mut i = 0; + while i < reg.gens[g].len() { + let slot = reg.gens[g][i]; + let e = reg.entry(slot); + if e.obj.as_ref().is_none_or(WeakObject::is_dead) { + // (The swap brings the list's last member to `i`.) + dead.push(reg.remove(slot)); + continue; + } + e.gc_refs.set(0); + e.set(F_REACHED, false); + e.set(F_CAND, true); + i += 1; + } + n += reg.gens[g].len(); + } + drop(reg); + if !dead.is_empty() { + self.tracked_count.fetch_sub( + dead.len().min(self.tracked_count.load(Ordering::Acquire)), + Ordering::AcqRel, + ); + } + n + } + + /// Move the surviving candidates of generations `0..=upto` up a + /// generation and drop the dead (unreached) ones from the registry. A + /// member that joined during the collection stays where it is. + fn rebuild_generations(&self, upto: usize) { + let mut reg = self.reg.borrow_mut(); + let mut lists: [Vec; N_GENERATIONS] = Default::default(); + let mut dead = Vec::new(); + for g in 0..=upto { + let target = (g + 1).min(N_GENERATIONS - 1); + for slot in std::mem::take(&mut reg.gens[g]) { + let e = reg.entry(slot); + if !e.has(F_CAND) { + lists[g].push(slot); + continue; } - if let Some(&j) = by_id.get(&id_of(child)) { - if cands[j].is_white() { - cands[j].color.set(color::Grey); - grey.push(j); + let reached = e.has(F_REACHED); + e.set(F_CAND | F_REACHED, false); + if reached { + reg.slab[slot as usize].gen = target as u8; + lists[target].push(slot); + } else { + // (Already out of its list.) + reg.forget_key(slot); + dead.push(reg.release(slot)); + } + } + } + for (g, list) in lists.into_iter().enumerate() { + if g > upto && list.is_empty() { + continue; + } + let start = reg.gens[g].len(); + for (i, &slot) in list.iter().enumerate() { + reg.slab[slot as usize].pos = (start + i) as u32; + } + reg.gens[g].extend(list); + } + drop(reg); + drop(dead); + } +} + +/// A collection's candidates and their edges to one another, as the mark +/// walk recorded them: node `k`'s edges are `edges[starts[k]..starts[k + +/// 1]]`, each a registered candidate's slot or a temporary's position +/// tagged [`TEMP_BIT`]; a registered candidate's node is in its entry, +/// and temporary `i`'s is `n_real + i`. +struct Graph<'a> { + reg: &'a Registry, + temps: &'a [Temp], + edges: &'a [u32], + starts: &'a [u32], + n_real: usize, +} + +impl Graph<'_> { + /// Mark everything reachable from the candidates on the `grey` stack + /// (registry slots, or temporaries tagged [`TEMP_BIT`]), which are + /// marked already. + fn propagate(&self, grey: &mut Vec) { + while let Some(item) = grey.pop() { + let node = if item & TEMP_BIT == 0 { + self.reg.entry(item).node.get() as usize + } else { + self.n_real + (item & !TEMP_BIT) as usize + }; + let range = self.starts[node] as usize..self.starts[node + 1] as usize; + for &edge in &self.edges[range] { + if edge & TEMP_BIT == 0 { + let e = self.reg.entry(edge); + if !e.has(F_REACHED) { + e.set(F_REACHED, true); + grey.push(edge); + } + } else { + let t = &self.temps[(edge & !TEMP_BIT) as usize]; + if !t.reached.get() { + t.reached.set(true); + grey.push(edge); } } - }); + } } } +} - /// The live objects of generations `0..=upto` as collection candidates; - /// entries whose object died are dropped from those generations and the - /// index. - fn snapshot_for_collection(&self, upto: usize) -> Vec { - let mut index = self.index.borrow_mut(); - let mut gens = self.generations.borrow_mut(); - let mut out = Vec::new(); - let mut pruned = 0usize; - for g in gens.iter_mut().take(upto.min(N_GENERATIONS - 1) + 1) { - g.handles.retain(|h| match h.object.upgrade() { - Some(obj) => { - out.push(Cand::new(obj, h.id, Some(h.clone()))); - true +/// How a collection's mark walk finds a child's candidate: through the +/// child's own registry slot, or else a cache of answers by address in +/// front of the registry's id index and the temporaries (a child is +/// usually reached many times: a module's namespace from every frame, a +/// class's method from every bound method). The registry can't change +/// while the walk runs, and a new temporary updates its own cache line. +struct Finder<'a> { + reg: &'a Registry, + filter: &'a crate::hot_filter::RebuildableBloom, + /// Temporaries' positions by id. + temp_ids: std::cell::RefCell, + /// Some temporary is also a registered object (outside the + /// candidates): a registered child may then still be a temporary. + registered_temp: std::cell::Cell, + /// Payload address -> answer (see [`Finder::encode`]), direct-mapped. + cache_keys: [std::cell::Cell; FINDER_CACHE], + cache_vals: [std::cell::Cell; FINDER_CACHE], +} + +/// [`Finder`]'s cache size. +const FINDER_CACHE: usize = 512; + +impl<'a> Finder<'a> { + fn new(reg: &'a Registry, filter: &'a crate::hot_filter::RebuildableBloom) -> Self { + Self { + reg, + filter, + temp_ids: std::cell::RefCell::new(GcIdMap::default()), + registered_temp: std::cell::Cell::new(false), + cache_keys: std::array::from_fn(|_| std::cell::Cell::new(0)), + cache_vals: std::array::from_fn(|_| std::cell::Cell::new(NO_SLOT)), + } + } + + #[inline] + fn line(key: ObjectId) -> usize { + ((key >> 4) ^ (key >> 13)) as usize & (FINDER_CACHE - 1) + } + + /// An answer as a cache value: [`NO_SLOT`] for none, a registered + /// candidate's slot, or a temporary's position tagged [`TEMP_BIT`]. + #[inline] + fn encode(hit: Option) -> u32 { + match hit { + None => NO_SLOT, + Some(Hit::Real(s)) => s, + Some(Hit::Temp(i)) => i | TEMP_BIT, + } + } + + #[inline] + fn decode(v: u32) -> Option { + if v == NO_SLOT { + None + } else if v & TEMP_BIT != 0 { + Some(Hit::Temp(v & !TEMP_BIT)) + } else { + Some(Hit::Real(v)) + } + } + + /// `child`'s candidate, if it is one. + #[inline] + fn find(&self, child: &Object) -> Option { + if let Some(cell) = intrusive_slot(child) { + let s = cell.get(); + if s != NO_SLOT { + if self.reg.entry(s).has(F_CAND) { + return Some(Hit::Real(s)); } - None => { - index.remove(&h.id); - pruned += 1; - false + if !self.registered_temp.get() { + return None; } - }); - for (i, h) in g.handles.iter().enumerate() { - h.slot.store(i, Ordering::Release); + } + // (Of these kinds, only an instance can be a temporary.) + if !matches!(child, Object::Instance(_)) { + return None; } } - if pruned > 0 { - self.tracked_count.fetch_sub( - pruned.min(self.tracked_count.load(Ordering::Acquire)), - Ordering::AcqRel, - ); + let key = child.payload_addr()? as ObjectId; + let line = Self::line(key); + if self.cache_keys[line].get() == key { + return Self::decode(self.cache_vals[line].get()); } - out + let hit = self.find_uncached(child, key); + self.cache_keys[line].set(key); + self.cache_vals[line].set(Self::encode(hit)); + hit } - fn rebuild_generations(&self, upto: usize, cands: &[Cand]) { - // Lock order MUST match `track` (index before generations). - let mut index = self.index.borrow_mut(); - let mut gens = self.generations.borrow_mut(); - for g in 0..=upto.min(N_GENERATIONS - 1) { - gens[g].handles.clear(); + /// [`Self::find`] past the intrusive slot and the cache. + fn find_uncached(&self, child: &Object, key: ObjectId) -> Option { + if intrusive_slot(child).is_none() && self.filter.may_contain(key) { + if let Some(&s) = self.reg.index.get(&key) { + if self.reg.entry(s).has(F_CAND) { + return Some(Hit::Real(s)); + } + if !self.registered_temp.get() { + return None; + } + } } - for c in cands { - let Some(h) = &c.entry else { continue }; - if c.is_white() { - index.remove(&h.id); - continue; + if !may_be_temporary(child) { + return None; + } + let ids = self.temp_ids.borrow(); + if ids.is_empty() { + return None; + } + ids.get(&id_of(child)).map(|&i| Hit::Temp(i as u32)) + } + + /// Whether `obj` has a registry entry. + fn registered(&self, obj: &Object) -> bool { + self.reg.slot_of(obj, self.filter).is_some() + } + + /// Record `child` as the temporary at position `i`. + fn add_temp(&self, child: &Object, i: usize) { + if !self.registered_temp.get() && self.registered(child) { + // The cached "not a candidate" answers for registered + // objects no longer hold. + self.registered_temp.set(true); + for k in &self.cache_keys { + k.set(0); } - let g = h.generation.load(Ordering::Acquire); - let new_g = g.saturating_add(1).min(MAX_GENERATION); - h.generation.store(new_g, Ordering::Release); - let new_g = usize::from(new_g); - h.slot.store(gens[new_g].handles.len(), Ordering::Release); - gens[new_g].handles.push(h.clone()); + } + self.temp_ids.borrow_mut().insert(id_of(child), i); + if let Some(key) = child.payload_addr() { + let key = key as ObjectId; + let line = Self::line(key); + self.cache_keys[line].set(key); + self.cache_vals[line].set(Self::encode(Some(Hit::Temp(i as u32)))); } } } +/// Whether [`promotes_temporarily`] can accept `child` (from some parent). +#[inline] +fn may_be_temporary(child: &Object) -> bool { + matches!( + child, + Object::Iter(_) + | Object::Tuple(_) + | Object::FrozenSet(_) + | Object::DictView(_) + | Object::Slice(_) + | Object::Cell(_) + | Object::Traceback(_) + | Object::Frame(_) + | Object::BoundMethod(_) + | Object::StaticMethod(_) + | Object::ClassMethod(_) + | Object::Property(_) + | Object::List(_) + | Object::Instance(_) + | Object::Dict(_) + ) +} + /// Id → candidate position, for one collection. type GcIdMap = std::collections::HashMap>; @@ -1893,7 +2431,6 @@ fn promotes_temporarily(child: &Object, parent_is_iter: bool, parent_is_frame: b // l.append(t)`, a recursive closure's `function -> cell -> // function`, an exception's `__traceback__ -> frame -> f_locals`). Object::Iter(_) - | Object::Tuple(_) | Object::FrozenSet(_) | Object::DictView(_) | Object::Slice(_) @@ -1904,6 +2441,10 @@ fn promotes_temporarily(child: &Object, parent_is_iter: bool, parent_is_frame: b | Object::StaticMethod(_) | Object::ClassMethod(_) | Object::Property(_) => true, + // A tuple of atomic values can't take part in a cycle (CPython + // untracks it at creation), and a list of edges or a dict of + // coordinates holds thousands. + Object::Tuple(t) => t.iter().any(|x| !is_atomic(x)), // Lists are tracked at creation, so an *untracked* list is only an // iterator's private snapshot buffer. Object::List(_) => parent_is_iter, @@ -2043,12 +2584,41 @@ pub fn strong_count_for(obj: &Object) -> usize { /// refcount-seeded reachability model — an unvisited child keeps its /// external `gc_refs` and therefore survives the pass. pub fn traverse_object(obj: &Object, visit: &mut dyn FnMut(&Object)) { + traverse_impl::(obj, visit); +} + +/// [`traverse_object`] for a collection's mark walk, whose visitor runs no +/// code and borrows no container: the common containers' cells are read +/// without borrow bookkeeping while nothing holds them mutably, and an +/// instance's class is visited through a handle that takes no reference. +fn traverse_collected(obj: &Object, visit: &mut dyn FnMut(&Object)) { + traverse_impl::(obj, visit); +} + +/// Run `f` on `cell`'s value: a guard-free view when `PEEK` allows one, +/// else a shared borrow (`None` while the cell is borrowed mutably). +#[inline(always)] +fn with_read(cell: &RefCell, f: impl FnOnce(&T) -> R) -> Option { + if PEEK { + // SAFETY: a `PEEK` traversal's visitor runs no code and borrows no + // container (see `traverse_collected`), so nothing can borrow the + // cell mutably while the view lives. + if let Some(v) = unsafe { cell.peek() } { + return Some(f(v)); + } + } + cell.try_borrow().ok().map(|g| f(&g)) +} + +#[inline(always)] +fn traverse_impl(obj: &Object, visit: &mut dyn FnMut(&Object)) { match obj { Object::List(l) => { - let Ok(v) = l.try_borrow() else { return }; - for item in v.iter() { - visit(item); - } + with_read::(l, |v| { + for item in v.iter() { + visit(item); + } + }); } Object::Tuple(t) => { for item in t.iter() { @@ -2056,18 +2626,20 @@ pub fn traverse_object(obj: &Object, visit: &mut dyn FnMut(&Object)) { } } Object::Dict(d) | Object::MappingProxy(d) | Object::SimpleNamespace(d) => { - let Ok(m) = d.try_borrow() else { return }; - for (k, v) in m.iter() { - visit(&k.0); - visit(v); - } + with_read::(d, |m| { + for (k, v) in m.iter() { + visit(&k.0); + visit(v); + } + }); } Object::MappingProxyObj(inner) => visit(inner), Object::Set(s) => { - let Ok(m) = s.try_borrow() else { return }; - for k in m.iter() { - visit(&k.0); - } + with_read::(s, |m| { + for k in m.iter() { + visit(&k.0); + } + }); } Object::FrozenSet(s) => { for k in s.iter() { @@ -2081,9 +2653,23 @@ pub fn traverse_object(obj: &Object, visit: &mut dyn FnMut(&Object)) { // instances (e.g. `A.a = A(); del A`) must see that edge subtracted // or it never collects. Built-in types are immortal and untracked, // so skip them (the `by_id` lookup would miss anyway). - let cls = i.cls(); - if !cls.flags.is_builtin { - visit(&Object::Type(cls)); + // SAFETY: as `with_read`'s; the instance keeps its class alive, + // and the view, which owns no reference, is never dropped. + match PEEK.then(|| unsafe { i.class.peek() }).flatten() { + Some(cls) => { + if !cls.flags.is_builtin { + let view = std::mem::ManuallyDrop::new(Object::Type(unsafe { + crate::sync::Rc::from_raw(crate::sync::Rc::as_ptr(cls)) + })); + visit(&view); + } + } + None => { + let cls = i.cls(); + if !cls.flags.is_builtin { + visit(&Object::Type(cls)); + } + } } // A namespace dict that is itself a GC candidate — a // `types.ModuleType('foo')` instance's `__dict__`, tracked in @@ -2099,14 +2685,14 @@ pub fn traverse_object(obj: &Object, visit: &mut dyn FnMut(&Object)) { // Split values: the instance's own children. Their names // are the class's shared strings, which hold nothing (as // CPython's inline values visit only the values). - if let Ok(split) = i.dict.split_cell().try_borrow() { + with_read::(i.dict.split_cell(), |split| { for v in split.values() { visit(v); } - } + }); } else if let Some(dict) = i.dict.get_shared() { let dict_obj = Object::Dict(dict); - if is_tracked(id_of(&dict_obj)) { + if is_tracked(&dict_obj) { visit(&dict_obj); } else if let Object::Dict(dict) = &dict_obj { if let Ok(m) = dict.try_borrow() { @@ -2117,12 +2703,12 @@ pub fn traverse_object(obj: &Object, visit: &mut dyn FnMut(&Object)) { } } } - if let Ok(slots) = i.slots.try_borrow() { - for (k, v) in slots.iter() { + with_read::(&i.slots, |slots| { + slots.for_each_entry(|k, v| { visit(&k.0); visit(v); - } - } + }); + }); // A built-in *container* subclass (`class C(list)`, `D(dict)`, // `S(set)`, …) keeps its payload in `native`; that container is // an internal, separately-untracked detail of the instance, so @@ -2131,7 +2717,7 @@ pub fn traverse_object(obj: &Object, visit: &mut dyn FnMut(&Object)) { // prompt reclamation can follow such a chain (a leaf `native` // like an `int`/`str` subclass simply has no children). if let Some(native) = i.native.get() { - traverse_object(native, visit); + traverse_impl::(native, visit); } // A C extension type (RFC 0044) may hold child references in // C-managed memory invisible to the dict walk above; give its @@ -2356,13 +2942,40 @@ fn run_external_traverse(obj: &Object, visit: &mut dyn FnMut(&Object)) { // The table is append-only and read lock-free (see `HookTable`); a // hook may re-enter the collector, and this function, on the same // thread. - for (matches, traverse) in TRAVERSE_TABLE.iter() { + for (matches, traverse) in TRAVERSE_TABLE.iter(hook_kind(obj)) { if matches(obj) { traverse(obj, visit); } } } +/// [`HookTable`] kinds: a hook names the kinds of object its `matches` can +/// accept, and only an object of one of them is offered to it. +pub mod hook_kind { + pub const INSTANCE: u8 = 1; + pub const GENERATOR: u8 = 2; + pub const ITER: u8 = 4; + pub const FRAME: u8 = 8; + pub const TRACEBACK: u8 = 16; + pub const OTHER: u8 = 32; + pub const ANY: u8 = u8::MAX; +} + +/// `obj`'s [`hook_kind`]. +#[inline] +fn hook_kind(obj: &Object) -> u8 { + match obj { + Object::Instance(_) => hook_kind::INSTANCE, + Object::Generator(_) | Object::Coroutine(_) | Object::AsyncGenerator(_) => { + hook_kind::GENERATOR + } + Object::Iter(_) => hook_kind::ITER, + Object::Frame(_) => hook_kind::FRAME, + Object::Traceback(_) => hook_kind::TRACEBACK, + _ => hook_kind::OTHER, + } +} + /// A small append-only registry of `(matches, hook)` function-pointer /// pairs with lock-free reads: hooks are registered at interpreter /// init and polled on every collection walk, so readers must not take a @@ -2371,7 +2984,7 @@ const HOOK_TABLE_CAP: usize = 16; struct HookTable { len: std::sync::atomic::AtomicUsize, - slots: [std::sync::OnceLock<(fn(&Object) -> bool, H)>; HOOK_TABLE_CAP], + slots: [std::sync::OnceLock<(fn(&Object) -> bool, H, u8)>; HOOK_TABLE_CAP], } impl HookTable { @@ -2384,17 +2997,22 @@ impl HookTable { } } - fn push(&self, matches: fn(&Object) -> bool, hook: H) { + fn push(&self, kinds: u8, matches: fn(&Object) -> bool, hook: H) { let i = self.len.fetch_add(1, Ordering::AcqRel); assert!(i < Self::CAP, "too many GC hook registrations"); - let _ = self.slots[i].set((matches, hook)); + let _ = self.slots[i].set((matches, hook, kinds)); } + /// The hooks offered an object of [`hook_kind`] `kind`. #[inline] - fn iter(&self) -> impl Iterator bool, H)> + '_ { + fn iter(&self, kind: u8) -> impl Iterator bool, H)> + '_ { let n = self.len.load(Ordering::Acquire).min(Self::CAP); // A slot past a registration in flight is still unset; skip it. - self.slots[..n].iter().filter_map(|s| s.get().copied()) + self.slots[..n].iter().filter_map(move |s| { + s.get() + .filter(|(_, _, kinds)| kinds & kind != 0) + .map(|&(m, h, _)| (m, h)) + }) } } @@ -2406,7 +3024,17 @@ pub fn register_traverse( matches: fn(&Object) -> bool, traverse: fn(&Object, &mut dyn FnMut(&Object)), ) { - TRAVERSE_TABLE.push(matches, traverse); + TRAVERSE_TABLE.push(hook_kind::ANY, matches, traverse); +} + +/// [`register_traverse`] for a hook whose `matches` only accepts objects +/// of the [`hook_kind`]s in `kinds`. +pub fn register_traverse_for( + kinds: u8, + matches: fn(&Object) -> bool, + traverse: fn(&Object, &mut dyn FnMut(&Object)), +) { + TRAVERSE_TABLE.push(kinds, matches, traverse); } static CLEAR_TABLE: HookTable = HookTable::new(); @@ -2416,7 +3044,7 @@ static CLEAR_TABLE: HookTable = HookTable::new(); /// cycles during the collector's clear phase. The companion of /// [`register_traverse`] (RFC 0044, WS4). fn run_external_clear(obj: &Object) { - for (matches, clear) in CLEAR_TABLE.iter() { + for (matches, clear) in CLEAR_TABLE.iter(hook_kind(obj)) { if matches(obj) { clear(obj); } @@ -2427,7 +3055,13 @@ fn run_external_clear(obj: &Object) { /// during the collector's clear phase so a matching object can drop the /// child references it holds outside the VM's view. pub fn register_clear(matches: fn(&Object) -> bool, clear: fn(&Object)) { - CLEAR_TABLE.push(matches, clear); + CLEAR_TABLE.push(hook_kind::ANY, matches, clear); +} + +/// [`register_clear`] for a hook whose `matches` only accepts objects of +/// the [`hook_kind`]s in `kinds`. +pub fn register_clear_for(kinds: u8, matches: fn(&Object) -> bool, clear: fn(&Object)) { + CLEAR_TABLE.push(kinds, matches, clear); } /// Drain a container's child references in place. Used during @@ -2471,7 +3105,9 @@ pub fn clear_object_fields(obj: &Object) -> bool { // that dict is still intact. run_external_clear(obj); if let Ok(mut slots) = i.slots.try_borrow_mut() { - *slots = crate::types::SlotStorage::default(); + if !slots.is_empty_default() { + *slots = crate::types::SlotStorage::default(); + } } if i.dict.published().is_none() { let values = i @@ -2541,7 +3177,7 @@ pub fn clear_object_fields(obj: &Object) -> bool { // Dropping the suspended frame box breaks the cycle // (the finalizer — close() — has already run by the // time clear is reached; see collect phase 5c). - if let Ok(mut st) = g.state.try_borrow_mut() { + if let Ok(mut st) = g.state().try_borrow_mut() { *st = crate::object::GeneratorState::Finished; } } @@ -2659,6 +3295,20 @@ pub fn track(obj: &Object) { with_state(|s| s.track(obj)); } +/// [`track`] for a fresh generator, coroutine or async generator: it joins +/// its young set (see [`GcState::nurse`]), or is registered at once. +pub fn track_generator(obj: &Object) { + let (Object::Generator(g) | Object::Coroutine(g) | Object::AsyncGenerator(g)) = obj else { + track(obj); + return; + }; + with_state(|s| { + if !s.nurse(&s.young_gens, g) { + s.track_now(obj); + } + }); +} + /// Track a list or dict that native code filled before publishing it (the /// unpickler's results) as if it had been tracked at birth, while still /// empty: it joins the deferred containers. Every collection promotes the @@ -2768,30 +3418,27 @@ pub fn collection_in_progress() -> bool { /// process-global GC. The inverse of [`track`]; backs the C-API /// `PyObject_GC_UnTrack` (RFC 0044, WS4). pub fn untrack(obj: &Object) { - let id = crate::weakref_registry::id_of(obj); - with_state(|s| s.untrack_id(id)); + with_state(|s| s.untrack(obj)); } -/// See [`GcState::forget_dead`]; a cheap filter probe first. +/// Drop the registry entry of the instance at `addr`, which is dying and +/// recorded registry slot `slot` (see [`GcState::forget_instance`]). #[inline] -pub fn forget_dead(id: ObjectId) { - if maybe_tracked(id) { - with_state(|s| s.forget_dead(id)); - } -} - -/// [`untrack`] by identity. -pub fn untrack_id(id: ObjectId) { - with_state(|s| s.untrack_id(id)); +pub fn forget_instance(slot: u32, addr: usize) { + with_state(|s| s.forget_instance(slot, addr)); } -/// [`untrack_id`] for a registered object only: one still in a young set +/// [`untrack`] for a registered generator only: one still in a young set /// stays there. For a finished generator, which holds no frame (and so no /// references a cycle could run through): finding it among thousands of /// young entries would cost more than leaving it, and a dead entry is /// dropped at the next flush. -pub fn untrack_registered_id(id: ObjectId) { - with_state(|s| s.untrack_id_in(id, false)); +pub fn untrack_generator(g: &crate::Rc) { + let slot = g.gc_slot.get(); + if slot != NO_SLOT { + let id = crate::Rc::as_ptr(g) as usize as ObjectId; + with_state(|s| s.untrack_slot(slot, id, false)); + } } /// Reinitialise the process-global cycle collector's locks in a `fork(2)` @@ -2837,6 +3484,12 @@ pub fn is_atomic(obj: &Object) -> bool { /// this is CPython's container-untracking optimization applied at /// construction time, and it keeps numeric/string-heavy workloads off /// the GC's books entirely. +/// `WP_GC_STATS`: print each collection's population (read once). +fn stats_debug() -> bool { + static ON: std::sync::OnceLock = std::sync::OnceLock::new(); + *ON.get_or_init(|| std::env::var_os("WP_GC_STATS").is_some()) +} + /// `WP_ROOT_DBG`: print each collection's roots (read once). fn root_debug() -> bool { static ON: std::sync::OnceLock = std::sync::OnceLock::new(); @@ -2890,14 +3543,32 @@ impl DeferredContainer { } } - /// The container, if it is still alive. - fn upgrade(&self) -> Option { + /// The handle as the registry holds it. + fn into_weak(self) -> WeakObject { match self { - Self::List(w) => w.upgrade().map(Object::List), - Self::Dict(w) => w.upgrade().map(Object::Dict), - Self::Set(w) => w.upgrade().map(Object::Set), + Self::List(w) => WeakObject::List(w), + Self::Dict(w) => WeakObject::Dict(w), + Self::Set(w) => WeakObject::Set(w), } } + + /// Run `f` on the container through a handle that takes no reference. + /// + /// # Safety + /// + /// The container must be alive, and nothing `f` does may release it. + unsafe fn with_borrowed(&self, f: impl FnOnce(&Object) -> R) -> R { + // SAFETY: alive, per the caller; the view owns no reference and is + // never dropped. + let obj = std::mem::ManuallyDrop::new(unsafe { + match self { + Self::List(w) => Object::List(crate::Rc::from_raw(w.as_ptr())), + Self::Dict(w) => Object::Dict(crate::Rc::from_raw(w.as_ptr())), + Self::Set(w) => Object::Set(crate::Rc::from_raw(w.as_ptr())), + } + }); + f(&obj) + } } /// An element that cannot route a cycle back out of the container @@ -2920,23 +3591,22 @@ fn container_can_cycle(obj: &Object) -> bool { // *container*, so beyond a point it stops paying for itself — and an // unbounded scan would make `track` O(len) for `list(range(1e6))`. const SCAN_CAP: usize = 32; + // (The scans run no code: a guard-free read is enough.) match obj { - Object::List(l) => l - .try_borrow() - .map(|v| v.len() > SCAN_CAP || v.iter().any(|x| !element_is_inert(x))) - .unwrap_or(true), - Object::Set(s) => s - .try_borrow() - .map(|m| m.len() > SCAN_CAP || m.iter().any(|k| !element_is_inert(&k.0))) - .unwrap_or(true), - Object::Dict(d) => d - .try_borrow() - .map(|m| { - m.len() > SCAN_CAP - || m.iter() - .any(|(k, v)| !element_is_inert(&k.0) || !element_is_inert(v)) - }) - .unwrap_or(true), + Object::List(l) => with_read::(l, |v| { + v.len() > SCAN_CAP || v.iter().any(|x| !element_is_inert(x)) + }) + .unwrap_or(true), + Object::Set(s) => with_read::(s, |m| { + m.len() > SCAN_CAP || m.iter().any(|k| !element_is_inert(&k.0)) + }) + .unwrap_or(true), + Object::Dict(d) => with_read::(d, |m| { + m.len() > SCAN_CAP + || m.iter() + .any(|(k, v)| !element_is_inert(&k.0) || !element_is_inert(v)) + }) + .unwrap_or(true), // A tuple can only anchor a cycle through a non-atomic element. An // empty or all-scalar tuple (the interned `()`, `(1, 2)`, …) can never // close one, so it stays off the GC's books. @@ -2991,26 +3661,16 @@ pub fn maybe_auto_collect() -> bool { with_state(GcState::maybe_auto_collect) } -/// Convenience: find a tracked handle by object id (O(1) via the -/// id index, which covers all generations plus the frozen set). -pub fn find_handle(id: ObjectId) -> Option> { - with_state(|s| s.handle_for(id)) -} - -/// Convenience: is `id` currently tracked by the cycle GC? -pub fn is_tracked(id: ObjectId) -> bool { - with_state(|s| s.is_tracked(id)) +/// Convenience: is `obj` currently tracked by the cycle GC? +pub fn is_tracked(obj: &Object) -> bool { + with_state(|s| s.is_tracked_obj(obj)) } -/// Convenience: claim `id`'s finalizer (so a later collection +/// Convenience: claim `obj`'s finalizer (so a later collection /// won't double-run `__del__`). Returns false if it was already -/// claimed or the object isn't tracked. -pub fn mark_finalized(id: ObjectId) -> bool { - with_state(|s| s.note_finalized(id)); - match find_handle(id) { - Some(h) => !h.finalized.swap(true, Ordering::AcqRel), - None => false, - } +/// claimed (a tracked object that isn't claims it). +pub fn claim_finalizer(obj: &Object) -> bool { + with_state(|s| s.claim_finalizer(obj)) != Some(true) } /// Convenience: has `id`'s finalizer already run on the current thread? @@ -3021,13 +3681,13 @@ pub fn was_finalized(id: ObjectId) -> bool { /// Convenience: mark `id`'s finalizer as finished on the current thread's GC /// (see [`GcState::complete_finalizer`]). -pub fn complete_finalizer(id: ObjectId) { - with_state(|s| s.complete_finalizer(id)); +pub fn complete_finalizer(obj: &Object) { + with_state(|s| s.complete_finalizer(obj)); } /// Convenience: the live tracked objects with an unrun `__del__` (see /// [`GcState::finalization_candidates`]). -pub fn finalization_candidates() -> Vec<(HandleRc, Object)> { +pub fn finalization_candidates() -> Vec { with_state(|s| s.finalization_candidates()) } @@ -3099,34 +3759,51 @@ mod tests { use crate::object::DictData; #[test] - fn compact_positions_keep_absent_and_uncached_states_distinct() { - for value in [0, 1, (u32::MAX - 2) as usize, usize::MAX] { - let hint = CachedSlot::new(value); - assert_eq!(hint.load(Ordering::Acquire), value); - assert_eq!(hint.swap(3, Ordering::AcqRel), value); - assert_eq!(hint.load(Ordering::Acquire), 3); - hint.store(value, Ordering::Release); - assert_eq!(hint.load(Ordering::Acquire), value); - } - for value in [(u32::MAX - 1) as usize, usize::MAX - 1] { - let hint = CachedSlot::new(value); - assert_eq!(hint.load(Ordering::Acquire), usize::MAX - 1); - assert_eq!(hint.swap(usize::MAX, Ordering::AcqRel), usize::MAX - 1); - assert_eq!(hint.load(Ordering::Acquire), usize::MAX); - } + fn registry_entries_stay_compact_and_slots_are_reused() { + let _gil = crate::gil::hold_gil(); #[cfg(target_pointer_width = "64")] - { - let hint = CachedSlot::new(u32::MAX as usize + 100); - assert_eq!(hint.load(Ordering::Acquire), usize::MAX - 1); - assert_eq!(std::mem::size_of::(), 32); + assert_eq!(std::mem::size_of::(), 32); + let state = GcState::new(); + let roots: Vec<_> = (0..3) + .map(|_| Object::Dict(Rc::new(RefCell::new(DictData::default())))) + .collect(); + for root in &roots { + state.track_now(root); } + let slab_len = state.reg.borrow().slab.len(); + state.untrack_id(id_of(&roots[1])); + assert!(!state.is_tracked(id_of(&roots[1]))); + let extra = Object::Dict(Rc::new(RefCell::new(DictData::default()))); + state.track_now(&extra); + // The freed slot is the new entry's. + assert_eq!(state.reg.borrow().slab.len(), slab_len); + assert!(state.is_tracked(id_of(&extra))); + for obj in [&roots[0], &roots[2], &extra] { + assert_eq!(placement(&state, obj).map(|p| p.0), Some(0)); + } + } + + /// `obj`'s generation (or [`GEN_FROZEN`]) and position in its list, + /// checking that the list holds it there. + fn placement(state: &GcState, obj: &Object) -> Option<(u8, u32)> { + let reg = state.reg.borrow(); + let slot = reg.slot_of(obj, &state.tracked_filter)?; + let e = reg.entry(slot); + let list = if e.gen == GEN_FROZEN { + ®.frozen + } else { + ®.gens[usize::from(e.gen)] + }; + assert_eq!(list[e.pos as usize], slot); + Some((e.gen, e.pos)) } #[test] - fn uncacheable_generation_and_frozen_positions_use_identity_fallback() { + fn removals_keep_generation_and_frozen_positions() { + let _gil = crate::gil::hold_gil(); for frozen in [false, true] { let state = GcState::new(); - let roots: Vec<_> = (0..3) + let roots: Vec<_> = (0..4) .map(|_| Object::Dict(Rc::new(RefCell::new(DictData::default())))) .collect(); for root in &roots { @@ -3135,22 +3812,20 @@ mod tests { if frozen { state.freeze_all(); } - let first = state.handle_for(id_of(&roots[0])).unwrap(); - first.slot.store((u32::MAX - 1) as usize, Ordering::Release); - state.untrack_id(first.id); - assert!(!state.is_tracked(first.id)); - let moved = state.handle_for(id_of(&roots[2])).unwrap(); - assert_eq!(moved.slot.load(Ordering::Acquire), 0); - let second = state.handle_for(id_of(&roots[1])).unwrap(); - // A cacheable but stale position must also validate identity. - second.slot.store(0, Ordering::Release); - state.untrack_id(second.id); - assert!(!state.is_tracked(second.id)); - assert!(state.is_tracked(moved.id)); - assert_eq!(state.freeze_count(), usize::from(frozen)); - state.untrack_id(moved.id); - assert!(!state.is_tracked(moved.id)); + state.untrack_id(id_of(&roots[0])); + assert!(!state.is_tracked(id_of(&roots[0]))); + // The last member moved into the vacated position. + assert_eq!(placement(&state, &roots[3]).unwrap().1, 0); + state.untrack_id(id_of(&roots[2])); + for root in [&roots[1], &roots[3]] { + let (gen, _) = placement(&state, root).unwrap(); + assert_eq!(gen == GEN_FROZEN, frozen); + } + assert_eq!(state.freeze_count(), if frozen { 2 } else { 0 }); + state.untrack_id(id_of(&roots[1])); + state.untrack_id(id_of(&roots[3])); assert_eq!(state.freeze_count(), 0); + assert_eq!(state.population(), 0); } } @@ -3174,6 +3849,7 @@ mod tests { #[test] fn live_roots_promote_freeze_and_untrack() { + let _gil = crate::gil::hold_gil(); let state = GcState::new(); let roots: Vec = (0..4) .map(|_| Object::Dict(Rc::new(RefCell::new(DictData::default())))) @@ -3185,48 +3861,32 @@ mod tests { for (collection, expected) in [(0, 1), (1, 2), (2, 2), (2, 2)] { assert_eq!(state.collect(collection), 0); for (slot, root) in roots.iter().enumerate() { - let handle = state.handle_for(id_of(root)).unwrap(); - assert_eq!(handle.generation.load(Ordering::Acquire), expected); - assert_eq!(handle.color.load(Ordering::Acquire), color::White); - assert_eq!(handle.slot.load(Ordering::Acquire), slot); + assert_eq!(placement(&state, root), Some((expected, slot as u32))); } } state.freeze_all(); assert_eq!(state.freeze_count(), roots.len()); assert_eq!(state.collect(2), 0); for root in &roots { - let handle = state.handle_for(id_of(root)).unwrap(); - assert_eq!(handle.color.load(Ordering::Acquire), color::Frozen); + assert_eq!(placement(&state, root).unwrap().0, GEN_FROZEN); } state.untrack_id(id_of(&roots[1])); assert!(!state.is_tracked(id_of(&roots[1]))); assert_eq!(state.freeze_count(), 3); - let moved = state.handle_for(id_of(&roots[3])).unwrap(); - assert_eq!(moved.slot.load(Ordering::Acquire), 1); + assert_eq!(placement(&state, &roots[3]).unwrap().1, 1); state.unfreeze_all(); assert_eq!(state.freeze_count(), 0); for (slot, index) in [0, 3, 2].into_iter().enumerate() { - let handle = state.handle_for(id_of(&roots[index])).unwrap(); - assert_eq!(handle.generation.load(Ordering::Acquire), 0); - assert_eq!(handle.color.load(Ordering::Acquire), color::White); - assert_eq!(handle.slot.load(Ordering::Acquire), slot); + assert_eq!(placement(&state, &roots[index]), Some((0, slot as u32))); } state.untrack_id(id_of(&roots[3])); assert!(!state.is_tracked(id_of(&roots[3]))); - let moved = state.handle_for(id_of(&roots[2])).unwrap(); - assert_eq!(moved.slot.load(Ordering::Acquire), 1); - } - - #[test] - fn generation_constructor_rejects_out_of_range_indices() { - for generation in [N_GENERATIONS, u8::MAX as usize + 1, usize::MAX] { - let result = std::panic::catch_unwind(|| TrackedHandle::new(&Object::None, generation)); - assert!(result.is_err()); - } + assert_eq!(placement(&state, &roots[2]).unwrap().1, 1); } #[test] fn track_and_untrack() { + let _gil = crate::gil::hold_gil(); let s = GcState::new(); let d = Object::Dict(Rc::new(RefCell::new(DictData::default()))); // `track_now`, not `track`: an empty dict holds nothing that could @@ -3240,6 +3900,7 @@ mod tests { #[test] fn collect_clears_simple_cycle() { + let _gil = crate::gil::hold_gil(); let s = GcState::new(); let dict = Rc::new(RefCell::new(DictData::default())); let outer = Object::Dict(dict.clone()); @@ -3261,6 +3922,7 @@ mod tests { #[test] fn tracked_objects_die_by_refcount() { + let _gil = crate::gil::hold_gil(); let s = GcState::new(); let dict = Rc::new(RefCell::new(DictData::default())); let obj = Object::Dict(dict.clone()); @@ -3277,6 +3939,7 @@ mod tests { #[test] fn freeze_unfreeze_round_trip() { + let _gil = crate::gil::hold_gil(); let s = GcState::new(); let d = Object::Dict(Rc::new(RefCell::new(DictData::default()))); // See `track_and_untrack` on `track_now`. diff --git a/crates/weavepy-vm/src/gen_fast.rs b/crates/weavepy-vm/src/gen_fast.rs index e1c1e6a7..1769ce73 100644 --- a/crates/weavepy-vm/src/gen_fast.rs +++ b/crates/weavepy-vm/src/gen_fast.rs @@ -62,6 +62,11 @@ enum ForNext { /// Nested fast steps at most this deep. const MAX_DEPTH: u8 = 8; +/// `gen_native_yield`'s stop for a release that queued a finalizer: the +/// frame is synced for the general loop, which runs it first. +#[cfg(feature = "jit")] +const MARKED_AT: usize = usize::MAX - 1; + /// The instructions a fast step runs (see the module docs). The scan /// also admits the generator prologue's `RETURN_GENERATOR` and the /// implicit PEP 479 handler, which a resume or only an exception reaches. @@ -100,66 +105,159 @@ fn op_supported(op: OpCode) -> bool { ) } +/// The instructions a fast step leaves to the body's native form (see +/// `frame_jit`), whose lowering of them never raises or switches in a +/// fast step (its helpers decline without a running activation): a body +/// whose steady state needs them takes fast steps once it's compiled. +fn op_native(code: &CodeObject, pc: usize) -> bool { + let ins = code.instructions[pc]; + match ins.op { + OpCode::BuildTuple => (1..=3).contains(&ins.arg), + OpCode::UnaryOp => ins.arg <= 3, + op => matches!( + op, + OpCode::LoadDeref + | OpCode::BinarySubscr + | OpCode::BinarySlice + | OpCode::LoadAttr + | OpCode::IsOp + | OpCode::ContainsOp + | OpCode::LoadGlobal + | OpCode::BuildList + | OpCode::CopyTop + | OpCode::Swap + | OpCode::PopJumpIfNone + | OpCode::PopJumpIfNotNone + ), + } +} + +/// [`code_ok`]'s verdicts (kept in the code's extension table). +const CODE_NO: u8 = 1; +const CODE_OK: u8 = 2; +/// Fast steps once the body is compiled (see [`op_native`]). +const CODE_NATIVE: u8 = 3; +/// The verdict's bits in the table's byte; the prologue's verdict (see +/// [`prologue`]) sits above them. +const CODE_MASK: u8 = 0x0f; +const PROLOGUE_SHIFT: u32 = 4; + /// Whether `code` is a plain generator whose steady state, everything a /// resume can reach from a `yield`, is instructions a fast step runs +/// ([`CODE_OK`]), or runs once its native form does ([`CODE_NATIVE`]) /// (cached in the code's extension table). The prologue may hold others /// (`range(n)` built before the loop): the first resume's step stops at /// them, and the general loop runs them once. -#[inline] -fn code_ok(code: &CodeObject) -> bool { +#[inline(always)] +fn code_ok(code: &CodeObject) -> u8 { use std::sync::atomic::Ordering; let Some(ext) = crate::code_vm_ext(code) else { - return false; + return CODE_NO; }; match ext.gen_fast.load(Ordering::Relaxed) { - 1 => false, - 2 => true, - _ => code_ok_scan(code, ext), + 0 => code_ok_scan(code, ext) & CODE_MASK, + v => v & CODE_MASK, } } +/// [`code_ok`]'s verdict for a body's first resume, everything it can +/// reach before its first `yield`: [`CODE_OK`] when a fast step runs all +/// of it, [`CODE_NATIVE`] when only its native form does, [`CODE_NO`] +/// when the step would stop partway (the general loop runs a prologue +/// with a call, say, once). +#[inline(always)] +fn prologue(code: &CodeObject) -> u8 { + use std::sync::atomic::Ordering; + let Some(ext) = crate::code_vm_ext(code) else { + return CODE_NO; + }; + let v = match ext.gen_fast.load(Ordering::Relaxed) { + 0 => code_ok_scan(code, ext), + v => v, + }; + v >> PROLOGUE_SHIFT +} + +/// Whether a fast step may run `g`'s body at all (see [`code_ok`]). +#[inline(always)] +pub(crate) fn steps_body(g: &PyGenerator) -> bool { + matches!(&g.code, Object::Code(code) if code_ok(code) != CODE_NO) +} + +/// Whether a fast step may run `g`'s body at all (see [`code_ok`]), and +/// `g` isn't a collapsed chain's level (see `Interpreter::gen_fast_next`). +#[inline(always)] +pub(crate) fn may_step(g: &PyGenerator) -> bool { + g.chain.get() == 0 && steps_body(g) +} + /// [`code_ok`]'s first verdict for a code object, remembered in its /// extension table. #[cold] #[inline(never)] -fn code_ok_scan(code: &CodeObject, ext: &crate::CodeConstObjects) -> bool { +fn code_ok_scan(code: &CodeObject, ext: &crate::CodeConstObjects) -> u8 { use std::sync::atomic::Ordering; - let ok = code.is_generator + let shape = code.is_generator && !code.is_coroutine && !code.is_async_generator && code.cellvars.is_empty() - && code.freevars.is_empty() - && in_bounds(code, ext.objects.len()) - && steady_state_supported(code); - ext.gen_fast - .store(if ok { 2 } else { 1 }, Ordering::Relaxed); - ok + && in_bounds(code, ext.objects.len()); + let verdict = |starts: &[usize], stop_at_yield: bool| { + if !shape { + CODE_NO + } else if code.freevars.is_empty() && reach_supported(code, starts, false, stop_at_yield) { + CODE_OK + } else if cfg!(feature = "jit") && reach_supported(code, starts, true, stop_at_yield) { + CODE_NATIVE + } else { + CODE_NO + } + }; + let instrs = &code.instructions; + let resumes: Vec = (0..instrs.len()) + .filter(|&p| instrs[p].op == OpCode::YieldValue) + .map(|p| p + 1) + .collect(); + let v = verdict(&resumes, false); + // A fresh generator starts past its `RETURN_GENERATOR`. + let start = instrs.iter().position(|i| i.op == OpCode::ReturnGenerator); + let first = match (v, start) { + (CODE_NO, _) | (_, None) => CODE_NO, + (_, Some(at)) => verdict(&[at + 1], true), + }; + let v = v | (first << PROLOGUE_SHIFT); + ext.gen_fast.store(v, Ordering::Relaxed); + v } -/// Whether every instruction a resume reaches from one of `code`'s yields -/// is one a fast step runs (jump targets are in range: see [`in_bounds`]). -fn steady_state_supported(code: &CodeObject) -> bool { +/// Whether every instruction a run from one of `starts` reaches (with +/// `stop_at_yield`, before a `yield`) is one a fast step runs (jump +/// targets are in range: see [`in_bounds`]), or with `native`, one its +/// native form runs (see [`op_native`]). +fn reach_supported(code: &CodeObject, starts: &[usize], native: bool, stop_at_yield: bool) -> bool { let instrs = &code.instructions; let n = instrs.len(); let mut seen = vec![false; n]; - let mut work: Vec = (0..n) - .filter(|&p| instrs[p].op == OpCode::YieldValue) - .map(|p| p + 1) - .collect(); + let mut work = starts.to_vec(); while let Some(p) = work.pop() { if p >= n || std::mem::replace(&mut seen[p], true) { continue; } let ins = instrs[p]; - if !op_supported(ins.op) { + if !op_supported(ins.op) && !(native && op_native(code, p)) { return false; } let arg = ins.arg as usize; match ins.op { OpCode::ReturnValue | OpCode::Reraise => {} + OpCode::YieldValue if stop_at_yield => {} OpCode::JumpForward => work.push(p + 1 + arg), OpCode::JumpBackward => work.push((p + 1).saturating_sub(arg)), - OpCode::PopJumpIfFalse | OpCode::PopJumpIfTrue | OpCode::ForIter => { + OpCode::PopJumpIfFalse + | OpCode::PopJumpIfTrue + | OpCode::PopJumpIfNone + | OpCode::PopJumpIfNotNone + | OpCode::ForIter => { work.push(p + 1); work.push(p + 1 + arg); } @@ -189,6 +287,8 @@ fn in_bounds(code: &CodeObject, nconsts: usize) -> bool { match i.op { OpCode::PopJumpIfFalse | OpCode::PopJumpIfTrue + | OpCode::PopJumpIfNone + | OpCode::PopJumpIfNotNone | OpCode::JumpForward | OpCode::ForIter => p + 1 + arg < n, OpCode::LoadFast @@ -317,7 +417,7 @@ impl Interpreter { /// fast-step body the general machinery holds no extra state for (no /// Python-visible frame, no saved exception state, no parked native /// activation). - #[inline] + #[inline(always)] pub(crate) fn gen_fast_frame_ok(frame: &Frame) -> bool { frame.py_frame.is_none() && !frame.has_saved_exc_info() @@ -336,7 +436,17 @@ impl Interpreter { true } } - && code_ok(&frame.code) + && match code_ok(&frame.code) { + CODE_OK => true, + // A body whose steady state needs its native form, compiled. + #[cfg(feature = "jit")] + CODE_NATIVE => crate::code_vm_ext(&frame.code).is_some_and(|ext| { + // SAFETY: a length read with nothing running. + let n = unsafe { (*frame.locals.as_ptr()).len() }; + ext.frame_jit.get(n).is_some() + }), + _ => false, + } } /// Run `frame` from its pc to its next `yield` (see the module docs). @@ -454,17 +564,21 @@ impl Interpreter { frame: frame_ptr, sw: std::ptr::null_mut(), gen_depth: depth, + direct: false, }); nst.len = len; nst.pc = pc; // SAFETY: the body's activation state, as this loop - // holds it (its locals count checked above). A queued - // finalizer waits for the general loop's next check. - let _ = unsafe { native.run(nst) }; + // holds it (its locals count checked above). + let status = unsafe { native.run(nst) }; + // (Its helpers never raise without a running activation.) + debug_assert!(nst.err.is_none()); len = nst.len; pc = nst.pc; handed = pc; - if pc >= ninstrs { + // A release queued a finalizer: the general loop runs it + // before the next instruction. + if pc >= ninstrs || status == crate::frame_jit::MARKED { break None; } } @@ -740,7 +854,8 @@ impl Interpreter { /// `frame_jit`), without the general loop's setup: `Ok` with the value /// the body yielded, the frame suspended past the yield; `Err` with /// the pc the native code stopped at (`usize::MAX` if it didn't run), - /// the frame synced there for [`Self::gen_fast_step`] to go on from. + /// the frame synced there for [`Self::gen_fast_step`] to go on from, + /// or [`MARKED_AT`] for the general loop to go on from. #[cfg(feature = "jit")] #[inline] fn gen_native_yield( @@ -792,9 +907,11 @@ impl Interpreter { frame: frame_ptr, sw: std::ptr::null_mut(), gen_depth: depth, + direct: false, }; // SAFETY: the body's activation state, as `gen_fast_step` holds it. - let _ = unsafe { native.run(&mut st) }; + let status = unsafe { native.run(&mut st) }; + debug_assert!(st.err.is_none()); let (len, pc) = (st.len, st.pc); // SAFETY: the native code leaves the first `len` slots initialized. unsafe { frame.stack.set_len(len) }; @@ -805,6 +922,8 @@ impl Interpreter { frame.agen_yielded_value = ins.arg == 0; Ok(frame.stack.pop().expect("a yielded value")) } + // A release queued a finalizer: the general loop takes over. + _ if status == crate::frame_jit::MARKED => Err(MARKED_AT), _ => Err(pc), } } @@ -850,19 +969,43 @@ impl Interpreter { ForNext::Bail } } - PyIterator::List { items, index, .. } => { + PyIterator::List { + items, + index, + owner, + } => { // SAFETY: as above. - let Some(v) = (unsafe { items.peek() }).and_then(|xs| xs.get(*index)) - else { + let Some(xs) = (unsafe { items.peek() }) else { return ForNext::Bail; }; + let Some(v) = xs.get(*index) else { + // Exhausted: it leaves the stack (as the core + // loop retires it) when its release frees + // nothing; a shared one (a generator + // expression's `.0`) detaches from the list, so + // a later append can't resurrect it. + if owner.is_some() || Rc::strong_count(items) == 1 { + return ForNext::Bail; + } + if !unique { + *items = Rc::new(crate::sync::RefCell::new(Vec::new())); + } + return ForNext::Exhausted; + }; let v = copy(v); *index += 1; ForNext::Value(v) } PyIterator::Tuple { items, index } => { let Some(v) = items.get(*index) else { - return ForNext::Bail; + // Exhausted: it leaves the stack (as the core + // loop retires it) when its release can't free + // the tuple, whose items could queue finalizers + // (a shared iterator stays exhausted). + if unique && crate::shared_value::ThinArc::strong_count(items) == 1 { + return ForNext::Bail; + } + return ForNext::Exhausted; }; let v = copy(v); *index += 1; @@ -885,29 +1028,45 @@ impl Interpreter { /// A resume's fast steps (its sent value already pushed): the value /// the body yields next, with a draining consumer's `fold` taking the - /// yields it can along the way, or `None` for the general loop to - /// continue from wherever the steps stopped. + /// yields it can along the way, or the value it returns, or + /// [`GenStep::Bail`] for the general loop to continue from wherever + /// the steps stopped. pub(crate) fn gen_fast_run( &mut self, frame: &mut Frame, snap_gen: u64, fold: Option, - ) -> Option { - if !Self::gen_fast_frame_ok(frame) { - return None; + ) -> GenStep { + if !Self::gen_fast_frame_ok(frame) + || (frame.gen_first_resume && !Self::gen_fast_prologue_ok(frame)) + { + return GenStep::Bail; } - match self.gen_fast_step( + self.gen_fast_step( frame, snap_gen, 0, fold, crate::gc_trace::maybe_dead_flag(), - false, + true, usize::MAX, - ) { - GenStep::Yielded(v) => Some(v), - GenStep::Returned(_) => unreachable!("not a finishing step"), - GenStep::Bail => None, + ) + } + + /// Whether a fresh generator's first resume (on `frame`) can take a + /// fast step to its first yield (see [`prologue`]): one that would + /// stop partway leaves the whole resume to the general loop. + #[inline(always)] + fn gen_fast_prologue_ok(frame: &Frame) -> bool { + match prologue(&frame.code) { + CODE_OK => true, + #[cfg(feature = "jit")] + CODE_NATIVE => crate::code_vm_ext(&frame.code).is_some_and(|ext| { + // SAFETY: a length read with nothing running. + let n = unsafe { (*frame.locals.as_ptr()).len() }; + ext.frame_jit.get(n).is_some() + }), + _ => false, } } @@ -921,6 +1080,13 @@ impl Interpreter { depth: u8, dead: *const std::cell::Cell, ) -> GenNext { + // A level of a collapsed `yield from` chain is the inline resume's + // (which resumes a parked chain without settling it), and a body no + // fast step runs declines at once (its code's verdict is cached: + // see `code_ok`). + if g.chain.get() != 0 || matches!(&g.code, Object::Code(code) if code_ok(code) == CODE_NO) { + return GenNext::Declined; + } if depth > MAX_DEPTH || crate::recursion::current_depth() + usize::from(depth) + 2 >= crate::recursion::recursion_limit() @@ -931,14 +1097,14 @@ impl Interpreter { // runs while it's held. // SAFETY: nothing below reaches the cell again until `state`'s // last use (`peek_mut` rejects a live guard or shared cells). - let Some(state) = (unsafe { g.state.peek_mut() }) else { + let Some(state) = (unsafe { g.state_raw().peek_mut() }) else { return GenNext::Declined; }; let (GeneratorState::Suspended(boxed) | GeneratorState::Created(boxed)) = &*state else { return GenNext::Declined; }; let first_resume = matches!(*state, GeneratorState::Created(_)); - if !Self::gen_fast_frame_ok(boxed) { + if !Self::gen_fast_frame_ok(boxed) || (first_resume && !Self::gen_fast_prologue_ok(boxed)) { return GenNext::Declined; } // A body an earlier fast step left partway (at the eval breaker, @@ -957,29 +1123,38 @@ impl Interpreter { } else { crate::push_fast(&mut frame.stack, Object::None); } - debug_assert!(!frame.stack.is_empty()); + // (A partial body may have stopped with nothing on its stack.) + debug_assert!(partial || !frame.stack.is_empty()); // A compiled body's resume usually runs natively to its next yield. #[cfg(feature = "jit")] let handed = match self.gen_native_yield(frame, snap_gen, depth, dead) { Ok(v) => { - Self::park_suspended_boxed(g, boxed); + Self::park_stepped(g, boxed); return GenNext::Yielded(v); } Err(pc) => pc, }; #[cfg(not(feature = "jit"))] let handed = usize::MAX; - let out = match self.gen_fast_step(frame, snap_gen, depth, None, dead, true, handed) { + #[cfg(feature = "jit")] + let step = if handed == MARKED_AT { + GenStep::Bail + } else { + self.gen_fast_step(frame, snap_gen, depth, None, dead, true, handed) + }; + #[cfg(not(feature = "jit"))] + let step = self.gen_fast_step(frame, snap_gen, depth, None, dead, true, handed); + let out = match step { GenStep::Yielded(v) => GenNext::Yielded(v), // The general epilogue of a return (`inline_gen_finish`): the // generator finishes and its frame is released (anything that // dies with it queues its finalizer). GenStep::Returned(v) => { - *g.state.borrow_mut() = GeneratorState::Finished; + Self::finish_running_gen(g); let frame: &mut Frame = &mut boxed; self.recycle_frame_allocs(frame); Self::release_finished_gen(g); - drop(boxed); + self.recycle_gen_box(boxed); return GenNext::Exhausted(v); } GenStep::Bail if frame.pc == start => { @@ -996,7 +1171,26 @@ impl Interpreter { GenNext::Partial } }; - Self::park_suspended_boxed(g, boxed); + Self::park_stepped(g, boxed); out } + + /// [`Self::park_suspended_boxed`] for a generator a fast step ran: + /// its state is still the step's `Running` (no code ran that could + /// reach it), and it has no frame object to stamp. + #[inline(always)] + fn park_stepped(g: &Rc, boxed: Box) { + debug_assert!(boxed.py_frame.is_none()); + if g.track_deferred.get() { + Self::park_suspended_boxed(g, boxed); + return; + } + // SAFETY: as above: nothing borrows the state, and `Running` owns + // nothing (no drop glue for the displaced state). + unsafe { + let st = g.state_raw().as_ptr(); + debug_assert!(matches!(*st, GeneratorState::Running)); + std::ptr::write(st, GeneratorState::Suspended(boxed)); + } + } } diff --git a/crates/weavepy-vm/src/gil.rs b/crates/weavepy-vm/src/gil.rs index 54a07130..6da537fd 100644 --- a/crates/weavepy-vm/src/gil.rs +++ b/crates/weavepy-vm/src/gil.rs @@ -298,6 +298,30 @@ impl GilState { } } + /// [`Self::acquire`], giving up after `timeout`. + pub(crate) fn acquire_within(self: &Arc, timeout: Duration) -> Option { + if free_threading_enabled() { + return Some(self.acquire()); + } + self.breaker.add_waiter(); + let lock_guard = self.lock.try_lock_for(timeout); + self.breaker.remove_waiter(); + let lock_guard = lock_guard?; + self.note_acquired(); + let me = current_thread_id(); + crate::sync::note_vm_thread(me); + self.holder.store(me, Ordering::Release); + self.depth.fetch_add(1, Ordering::AcqRel); + // SAFETY: as in `acquire`. + let static_guard: parking_lot::ReentrantMutexGuard<'static, ()> = + unsafe { std::mem::transmute(lock_guard) }; + Some(GilGuard { + state: Arc::clone(self), + _lock_guard: Some(static_guard), + lock_free: false, + }) + } + /// Try to acquire without blocking. pub fn try_acquire(self: &Arc) -> Option { if free_threading_enabled() { @@ -688,6 +712,113 @@ pub fn current_thread_holds_gil() -> bool { GIL_GUARD_STACK.with(|cell| !cell.borrow().is_empty()) } +/// Hold the GIL for a scope: take it (on the guard stack, so the +/// cooperative hand-off can still pass it on) unless the calling thread +/// already holds it. The returned [`GilScope`] gives it back on drop. +/// +/// Every thread that touches VM objects must hold the GIL, not only the +/// one running bytecode: the cycle collector is process-wide, and a +/// collection on one thread reads every tracked object, including +/// another interpreter's, without taking their cells' borrows. Code that +/// builds, mutates or releases objects outside an eval loop -- an +/// embedder constructing or dropping an [`crate::Interpreter`], a +/// thread's teardown, a native unit test -- holds one of these. +pub fn hold_gil() -> GilScope { + let mut scope = GilScope::idle(); + scope.engage(); + scope +} + +/// The GIL held for a scope (see [`hold_gil`]). +#[derive(Debug, Default)] +#[must_use = "the GIL is released when the scope is dropped"] +pub struct GilScope { + /// Whether this scope pushed a guard it must pop. + engaged: bool, +} + +impl GilScope { + /// A scope that holds nothing until [`Self::engage`]d. + pub const fn idle() -> Self { + Self { engaged: false } + } + + /// Take the GIL unless this scope or the calling thread already holds + /// it. + pub fn engage(&mut self) { + if self.engaged { + return; + } + // (`try_with`: an interpreter may be dropped by a thread-local + // destructor, after this thread's guard stack is gone; there is + // nothing to push the guard onto then, and no bytecode can run.) + let held = GIL_GUARD_STACK.try_with(|cell| !cell.borrow().is_empty()); + if held != Ok(false) { + return; + } + push_gil_guard(global_gil_ref().acquire()); + note_gil_acquired(); + self.engaged = true; + } +} + +impl Drop for GilScope { + fn drop(&mut self) { + if self.engaged { + // The cooperative hand-off may have replaced the stack's + // guards meanwhile, but it restores as many as it took. + drop(GIL_GUARD_STACK.try_with(|cell| cell.borrow_mut().pop())); + } + } +} + +/// A thread-local value that holds objects, released under the GIL when +/// its thread exits. +/// +/// A thread's destructors run after it has given the GIL back (and after +/// its guard stack may be gone), so a cache that holds the last reference +/// to a tracked object would otherwise free it while another thread's +/// collection reads it. The destructor takes the GIL directly, without +/// the guard stack, for the length of the release. If the GIL stays busy +/// for [`EXIT_GIL_WAIT`] (another thread blocked while holding it), the +/// value is leaked instead: a thread's exit, or the process's, must not +/// hang on it. +pub(crate) struct ReleaseUnderGil(std::mem::ManuallyDrop); + +/// How long a thread-local destructor waits for the GIL (see +/// [`ReleaseUnderGil`]). +const EXIT_GIL_WAIT: Duration = Duration::from_secs(1); + +impl ReleaseUnderGil { + pub(crate) const fn new(value: T) -> Self { + Self(std::mem::ManuallyDrop::new(value)) + } +} + +impl std::ops::Deref for ReleaseUnderGil { + type Target = T; + + fn deref(&self) -> &T { + &self.0 + } +} + +impl Drop for ReleaseUnderGil { + fn drop(&mut self) { + let gil = global_gil_ref(); + let _guard = if gil.lock.is_owned_by_current_thread() { + None + } else { + match gil.acquire_within(EXIT_GIL_WAIT) { + Some(guard) => Some(guard), + None => return, + } + }; + // SAFETY: dropped exactly once, here. + unsafe { std::mem::ManuallyDrop::drop(&mut self.0) }; + } +} + /// RFC 0025: drop the GIL, run `f`, re-acquire the GIL, then /// return `f`'s result. Used by every blocking-I/O / lock-acquire /// path that would otherwise prevent other threads from running. @@ -820,8 +951,8 @@ fn no_yield_active() -> bool { /// blocking-release re-acquire in [`GilGuard::allow_threads`]. #[inline] pub fn note_gil_acquired() { - GIL_HELD_SINCE.with(|c| c.set(Some(std::time::Instant::now()))); - WAITER_SEEN_SINCE.with(|c| c.set(None)); + let _ = GIL_HELD_SINCE.try_with(|c| c.set(Some(std::time::Instant::now()))); + let _ = WAITER_SEEN_SINCE.try_with(|c| c.set(None)); } /// Whether a waiter has been waiting on this holder for at least the @@ -892,6 +1023,14 @@ pub fn yield_checkpoint() { maybe_yield_gil(); } +/// Whether a checkpoint would return at once: no thread waits for the +/// GIL and no waiter's clock is armed (see [`maybe_yield_gil`]). An +/// expired countdown then starts over where it ran out. +#[inline] +pub(crate) fn handoff_idle() -> bool { + global_gil_ref().breaker.waiter_count() == 0 && !WAITER_CLOCK_ARMED.load(Ordering::Relaxed) +} + /// Hand the GIL to a waiting thread, if any. Drops the calling /// thread's guard stack (releasing the lock), spins briefly so a /// waiter can take it, then re-acquires. No-op when nobody is diff --git a/crates/weavepy-vm/src/hot_gates.rs b/crates/weavepy-vm/src/hot_gates.rs index d84b931b..7be3098a 100644 --- a/crates/weavepy-vm/src/hot_gates.rs +++ b/crates/weavepy-vm/src/hot_gates.rs @@ -64,13 +64,12 @@ static HOT: AtomicU32 = AtomicU32::new(0); /// RFC 0065 (WS1): the dispatch loop's *generation* word. Bumped by /// every mutation that can change the loop prologue's decisions — -/// hot-gate bits ([`set`]/[`clear`] below), observer registration -/// (`trace::bump_observer_gen`), and frame materialization -/// (`FrameShell::materialize`). The dispatch loop caches a snapshot +/// hot-gate bits ([`set`]/[`clear`] below) and observer registration +/// (`trace::bump_observer_gen`). The dispatch loop caches a snapshot /// of the prologue's inputs keyed by this generation: while the /// generation is unchanged *and* the snapshot says "quiet" (no -/// pending work, no observers, no materialized frame), the loop runs one relaxed load + compare per -/// instruction instead of the full ten-plus-probe prologue. +/// pending work, no observers), the loop runs one relaxed load + compare +/// per instruction instead of the full ten-plus-probe prologue. /// /// Same producer/consumer discipline as [`HOT`]: a spurious bump is /// always safe (one cold re-snapshot); a missed bump is never diff --git a/crates/weavepy-vm/src/import.rs b/crates/weavepy-vm/src/import.rs index e53d928a..a13e172d 100644 --- a/crates/weavepy-vm/src/import.rs +++ b/crates/weavepy-vm/src/import.rs @@ -518,6 +518,10 @@ impl ModuleCache { /// is the `pythonXY.zip` landmark or any directory that is itself a /// stdlib tree (contains `os.py` — the landmark CPython's `getpath` /// uses), e.g. a vendored `Lib/`; scanning stops there. + /// + /// Every frozen import runs this scan, so it reads the cached directory + /// listings as [`Self::find_source`] does (one `stat` per directory + /// instead of one per candidate). pub fn find_source_shadowing_stdlib(&self, full_name: &str) -> Option<(PathBuf, bool)> { let rel: PathBuf = full_name.split('.').collect(); for dir in self.search_dirs() { @@ -527,22 +531,34 @@ impl ModuleCache { { return None; } - if dir.join("os.py").is_file() { + if Self::has_stdlib_landmark(&dir) { return None; } // Package directory before module file, as in `find_source`. - let pkg_init = dir.join(&rel).join("__init__.py"); - if pkg_init.is_file() && Self::entry_case_ok(pkg_init.parent().unwrap_or(&pkg_init)) { - return Some((pkg_init, true)); - } - let module_file = dir.join(&rel).with_extension("py"); - if module_file.is_file() && Self::entry_case_ok(&module_file) { - return Some((module_file, false)); + if let Some(hit) = Self::probe_source(&dir, &rel) { + return Some(hit); } } None } + /// Whether `dir` holds an `os.py` file, the stdlib landmark. The + /// listing settles the usual miss; a name matching in any case is + /// confirmed with a `stat`, which also matches a differently cased + /// entry where the filesystem ignores case. + fn has_stdlib_landmark(dir: &Path) -> bool { + const LANDMARK: &str = "os.py"; + let Some(names) = dir_listing(dir) else { + return false; + }; + let candidate = names.contains(std::ffi::OsStr::new(LANDMARK)) + || names.iter().any(|n| { + n.as_encoded_bytes() + .eq_ignore_ascii_case(LANDMARK.as_bytes()) + }); + candidate && dir.join(LANDMARK).is_file() + } + /// Whether a frozen name is a bundled *third-party facade* rather /// than stdlib. These are PyPI projects WeavePy freezes as a /// convenience (`packaging`, `numpy`, `pytest`, …). In CPython they diff --git a/crates/weavepy-vm/src/inst_dict.rs b/crates/weavepy-vm/src/inst_dict.rs index 5485a91e..4980859c 100644 --- a/crates/weavepy-vm/src/inst_dict.rs +++ b/crates/weavepy-vm/src/inst_dict.rs @@ -41,6 +41,10 @@ pub struct SharedKeys { keys: [UnsafeCell>; SHARED_KEYS_CAP], /// Each published name's Python hash. hashes: [UnsafeCell; SHARED_KEYS_CAP], + /// Tables made from this one by a deletion (see + /// [`Self::without`]): `(n, i, table)` for the first `n` names less + /// the `i`th. Touched only under the GIL. + derived: UnsafeCell)>>, } // SAFETY: names are published with release/acquire ordering and are @@ -64,6 +68,7 @@ impl Default for SharedKeys { filter: AtomicU64::new(0), keys: [const { UnsafeCell::new(MaybeUninit::uninit()) }; SHARED_KEYS_CAP], hashes: [const { UnsafeCell::new(0) }; SHARED_KEYS_CAP], + derived: UnsafeCell::new(Vec::new()), } } } @@ -118,15 +123,82 @@ impl SharedKeys { /// Publish the `str` name `name` as the next name; `None` when the /// table is full. The caller holds the GIL outside free-threaded mode. fn push(&self, name: &SharedStr) -> Option { + self.push_key( + DictKey(Object::Str(name.clone())), + crate::object::py_str_hash(name), + ) + } + + /// Remove the `i`th name, closing up the rest: only for a table no + /// one else holds (an instance's private names, see + /// [`SplitValues::remove_str`]). + fn remove_at(&mut self, i: usize) { + let n = *self.len.get_mut(); + if i >= n { + return; + } + // SAFETY: `&mut self` is exclusive; the first `n` names are + // initialized, the `i`th drops once, and the later ones move down + // one slot each. + unsafe { + self.keys[i].get_mut().assume_init_drop(); + for k in i + 1..n { + let key = self.keys[k].get_mut().assume_init_read(); + self.keys[k - 1].get_mut().write(key); + *self.hashes[k - 1].get_mut() = *self.hashes[k].get_mut(); + } + } + *self.len.get_mut() = n - 1; + let mut filter = 0u64; + for h in &mut self.hashes[..n - 1] { + filter |= 1 << (*h.get_mut() & 63); + } + *self.filter.get_mut() = filter; + // The tables derived from the old names no longer derive from these. + self.derived.get_mut().clear(); + } + + /// The first `n` names less the `i`th (`i + 1 < n <= len`), as a table + /// of their own: the one an earlier deletion of the same shape made, + /// when this table remembers it, so instances that delete the same + /// attributes in the same order share their tables, as they share + /// their class's (deletions in `__enter__`, say). A remembered table + /// may have grown since (appends of later stores), but its first + /// `n - 1` names stay these. The caller holds the GIL. + fn without(&self, n: usize, i: usize) -> Rc { + const DERIVED_CAP: usize = 8; + // SAFETY: GIL-serialized; nothing below reaches this list again + // (building a table runs no code). + let derived = unsafe { &mut *self.derived.get() }; + if let Some((_, _, t)) = derived + .iter() + .find(|&&(dn, di, _)| dn as usize == n && di as usize == i) + { + return t.clone(); + } + let fresh = SharedKeys::default(); + for k in (0..n).filter(|&k| k != i) { + let key = self.get(k).expect("a set value's name").clone(); + // SAFETY: slot `k` is published (below the length). + fresh.push_key(key, unsafe { *self.hashes[k].get() }); + } + let fresh = Rc::new(fresh); + if derived.len() < DERIVED_CAP { + derived.push((n as u32, i as u32, fresh.clone())); + } + fresh + } + + /// [`Self::push`] of a name key whose Python hash is `hash`. + fn push_key(&self, key: DictKey, hash: i64) -> Option { let n = self.len.load(Ordering::Relaxed); if n >= SHARED_KEYS_CAP { return None; } - let hash = crate::object::py_str_hash(name); // SAFETY: slot `n` is unpublished, so no reader can see it, and // the GIL serializes writers. unsafe { - (*self.keys[n].get()).write(DictKey(Object::Str(name.clone()))); + (*self.keys[n].get()).write(key); *self.hashes[n].get() = hash; } self.filter.fetch_or(1 << (hash & 63), Ordering::Relaxed); @@ -180,6 +252,49 @@ fn key_names_str(key: &DictKey, name: &str) -> bool { matches!(&key.0, Object::Str(s) if name_eq(s, name)) } +/// A name's last position among a class's shared names (see +/// [`SplitValues::holds_memo`]): the names table's address and the +/// position. Touched only under the GIL. +#[derive(Default, Debug)] +pub struct NameMemo(std::cell::UnsafeCell<(usize, u32)>); + +// SAFETY: read and written only under the GIL (never in free-threaded +// mode, whose paths don't consult it). +unsafe impl Sync for NameMemo {} +// SAFETY: as above. +unsafe impl Send for NameMemo {} + +/// A name's position in the names table it was last found in (see +/// [`SplitValues::get_memo`]). A hit is verified against the table, so a +/// stale or torn pair only costs a search. +#[derive(Default, Debug)] +pub struct PosMemo { + keys: AtomicUsize, + pos: AtomicUsize, + /// The address of the name's text in the table (a hit whose name + /// sits at the same address, with the same hash, needs no compare). + text: AtomicUsize, +} + +impl PosMemo { + pub const fn new() -> Self { + Self { + keys: AtomicUsize::new(0), + pos: AtomicUsize::new(0), + text: AtomicUsize::new(0), + } + } +} + +/// The address of a `str` key's text (0 for any other key). +#[inline(always)] +fn key_text(key: &DictKey) -> usize { + match &key.0 { + Object::Str(s) => s.as_ptr() as usize, + _ => 0, + } +} + /// The header of an instance's split values allocation; the values /// follow it. #[repr(C)] @@ -268,6 +383,19 @@ impl SplitValues { unsafe { (*h).keys.as_ref() } } + /// The shared names' address (`0` none) and how many values are set. + #[inline(always)] + pub fn keys_and_len(&self) -> (usize, usize) { + match self.block { + // SAFETY: the block is live while owned. + Some(b) => unsafe { + let h = b.as_ptr(); + ((*h).keys as usize, (*h).len as usize) + }, + None => (0, 0), + } + } + /// How many attributes are set. #[inline(always)] pub fn len(&self) -> usize { @@ -484,6 +612,46 @@ impl SplitValues { self.block = Some(h); } + /// Lay `n` values down as the first `n` of values over `keys` (a + /// fresh instance's constructor stores, in its names' order), taking + /// value `k` from `value(k)` once each; a block without names adopts + /// them through `share`. `false` when the block can't take them all + /// at once (no block, values already set, too little room or other + /// names), touching nothing and calling `value` never. + pub(crate) fn fill_fresh( + &mut self, + keys: &SharedKeys, + share: impl FnOnce() -> Rc, + n: usize, + mut value: impl FnMut(usize) -> Object, + ) -> bool { + if n > keys.len() { + return false; + } + let Some(b) = self.block else { + return false; + }; + let h = b.as_ptr(); + // SAFETY: the block is live while owned; its first `n` slots are + // inside the capacity (checked) and unset (the length is zero). + unsafe { + if (*h).len != 0 || ((*h).cap as usize) < n { + return false; + } + if (*h).keys.is_null() { + (*h).keys = Rc::into_raw(share()); + } else if !std::ptr::eq((*h).keys, keys) { + return false; + } + let values = Self::values_ptr(h); + for k in 0..n { + values.add(k).write(value(k)); + } + (*h).len = n as u32; + } + true + } + /// Whether [`Self::append_over`] of position `i` of `keys` succeeds /// once the positions from the current length up to `i` have been /// appended first (the next of a run of in-order appends). @@ -539,6 +707,67 @@ impl SplitValues { self.keys()?.position_hashed(self.len(), name, hash) } + /// Whether these values hold `name` (Python hash `hash`), with `memo` + /// remembering the names table it last searched and the name's + /// position there (all of them when absent). The table only grows, + /// so values no longer than that position can't hold the name, and + /// only longer ones search again. + #[inline] + pub fn holds_memo(&self, name: &str, hash: i64, memo: &NameMemo) -> bool { + let Some(keys) = self.keys() else { + return false; + }; + // (A clear filter bit settles it at once.) + if keys.filter.load(Ordering::Relaxed) & (1 << (hash & 63)) == 0 { + return false; + } + let n = self.len(); + let at = std::ptr::from_ref(keys) as usize; + // SAFETY: GIL-serialized (see `NameMemo`). + let (k, before) = unsafe { *memo.0.get() }; + if k == at && n <= before as usize { + return false; + } + let before = keys.names_before(name, hash); + // SAFETY: as above. + unsafe { *memo.0.get() = (at, u32::try_from(before).unwrap_or(u32::MAX)) }; + n > before + } + + /// The value of attribute `name` (Python hash `hash`), with `memo` + /// remembering the names table it was last found in and its position + /// there. A name never moves within a table, so a hit checks just + /// that position (the name there, in case the table's address was + /// reused); anything else searches and remembers. + #[inline] + pub fn get_memo(&self, name: &str, hash: i64, memo: &PosMemo) -> Option<&Object> { + let keys = self.keys()?; + let n = self.len(); + let at = std::ptr::from_ref(keys) as usize; + let (k, i) = ( + memo.keys.load(Ordering::Relaxed), + memo.pos.load(Ordering::Relaxed), + ); + if k == at && i < n { + // SAFETY: slot `i` is published (below the values' length, + // which never exceeds the table's). + let h = unsafe { *keys.hashes[i].get() }; + if h == hash + && keys.get(i).is_some_and(|key| { + key_text(key) == memo.text.load(Ordering::Relaxed) || key_names_str(key, name) + }) + { + return self.values().get(i); + } + } + let i = keys.position_hashed(n, name, hash)?; + memo.keys.store(at, Ordering::Relaxed); + memo.pos.store(i, Ordering::Relaxed); + memo.text + .store(keys.get(i).map_or(0, key_text), Ordering::Relaxed); + self.values().get(i) + } + /// [`Self::position`] for a borrowed name (identity of the bytes /// first: a name read off an interned string settles without a /// comparison). @@ -576,6 +805,18 @@ impl SplitValues { .filter_map(move |(i, v)| Some((keys?.get(i)?, v))) } + /// A new strong handle on the names, while any value is (or was) set. + fn keys_rc(&self) -> Option> { + self.block.and_then(|b| { + // SAFETY: a non-null `keys` is a live strong reference. + let k = unsafe { (*b.as_ptr()).keys }; + (!k.is_null()).then(|| unsafe { + Rc::increment_strong_count(k); + Rc::from_raw(k) + }) + }) + } + /// A copy of the names and values (for a materialization that can't /// move them). fn snapshot(&self) -> (Option>, Vec) { @@ -639,6 +880,44 @@ impl SplitValues { Ok(None) } + /// Remove attribute `name`, returning its value (`None` when it is not + /// set). The last value simply leaves (the instance then holds one + /// name fewer of the same table); removing any other lays the rest out + /// over a table of their names, in order (the one other instances that + /// deleted the same way share, see [`SharedKeys::without`], or one + /// private to this instance, which closes up in place on the next + /// deletion). Compiled code checks + /// an instance's names against its class's before using a position, so + /// such an instance takes the general paths from then on, as one with + /// a real dictionary does, without materializing one (CPython's split + /// dictionaries also keep their layout across a deletion). + pub fn remove_str(&mut self, name: &str) -> Option { + let i = self.position_str(name)?; + let h = self.block?.as_ptr(); + // SAFETY: the block is live while owned, `i` is below its length, + // and every value from `i` on moves down one slot exactly once + // (the removed one moves out first). + unsafe { + let n = (*h).len as usize; + let values = Self::values_ptr(h); + let removed = values.add(i).read(); + if i + 1 < n { + let mut keys = Rc::from_raw((*h).keys); + match Rc::get_mut(&mut keys) { + // Names already private to this instance (an earlier + // deletion's) close up in place. + Some(own) => own.remove_at(i), + // Shared names: the table for the rest of them. + None => keys = keys.without(n, i), + } + (*h).keys = Rc::into_raw(keys); + std::ptr::copy(values.add(i + 1), values.add(i), n - i - 1); + } + (*h).len = n as u32 - 1; + Some(removed) + } + } + /// Move every value out (the caller drops them after releasing the /// cell) and forget the names. pub fn take(&mut self) -> Vec { @@ -664,8 +943,37 @@ impl SplitValues { } /// Drop every value, keeping the allocation, and forget the names. + /// + /// The values leave the block before any of them drops (a drop can run + /// code that reaches this instance), staged on the stack when there + /// are few rather than in a fresh vector. pub fn reset(&mut self) { - drop(self.take()); + const STAGE: usize = 8; + let Some(b) = self.block else { + return; + }; + let h = b.as_ptr(); + // SAFETY: as `take`: the first `len` values move out exactly once + // (the length is zeroed before anything can observe it), and the + // names' strong count is released once. + unsafe { + let n = (*h).len as usize; + if n > STAGE { + drop(self.take()); + return; + } + let mut staged = [const { std::mem::MaybeUninit::::uninit() }; STAGE]; + std::ptr::copy_nonoverlapping(Self::values_ptr(h), staged.as_mut_ptr().cast(), n); + (*h).len = 0; + let keys = std::mem::replace(&mut (*h).keys, std::ptr::null()); + if !keys.is_null() { + drop(Rc::from_raw(keys)); + } + std::ptr::drop_in_place(std::ptr::slice_from_raw_parts_mut( + staged.as_mut_ptr().cast::(), + n, + )); + } } } @@ -863,7 +1171,7 @@ impl InstDict { let owner = self.owner(); let (keys, values) = match self.split.try_borrow_mut() { Ok(mut s) => { - let keys = s.snapshot().0; + let keys = s.keys_rc(); (keys, s.take()) } // A live view of the values (nothing in the VM holds one across @@ -877,22 +1185,43 @@ impl InstDict { s.snapshot() } }; - let n = values.len(); - let mut d = if owner.deferred.get() { - DictData::deferred_for_capacity(std::ptr::from_ref(owner) as usize, n) - } else { - DictData::with_capacity_and_hasher(n, crate::fasthash::FxBuildHasher) - }; - if let Some(keys) = keys { - // A deferred owner holds only atomic values, and a tracked - // one needs no barrier: insert without either. - let map = d.map_mut_atomic_store(); - for (i, v) in values.into_iter().enumerate() { - if let Some(k) = keys.get(i) { - map.insert(k.clone(), v); + // A deferred owner holds only atomic values, and a tracked one + // needs no barrier: the table is built without either. The names + // are distinct `str`s whose hashes the shared table kept, so the + // entries go down in order and are indexed once, without hashing + // or comparing. + let mut values = values; + let map = match keys { + Some(keys) => { + let n = values.len().min(keys.len()); + let src = values.as_ptr(); + let map = crate::dictmap::DictMap::from_unique_hashed(n, |i| { + // SAFETY: slot `i` is published (below the length), + // and value `i` moves out once (the vector forgets the + // first `n` below). + unsafe { + let k = (*keys.keys[i].get()).assume_init_ref(); + (*keys.hashes[i].get(), k.clone(), src.add(i).read()) + } + }); + // SAFETY: the first `n` values moved into the table; any + // past the names (none in practice) drop with the vector. + unsafe { + let rest = values.len() - n; + std::ptr::copy(src.add(n), values.as_mut_ptr(), rest); + values.set_len(rest); } + map } - } + None => crate::dictmap::DictMap::default(), + }; + drop(values); + let deferred = if owner.deferred.get() { + std::ptr::from_ref(owner) as usize + } else { + 0 + }; + let d = DictData::from_map_for(deferred, map); self.lazy.get_or_init(|| Rc::new(RefCell::new(d))) } } @@ -979,6 +1308,50 @@ impl crate::types::PyInstance { split.append_over(keys, || cls.shared_keys.share(), i, value) } + /// Store `value` at position `i` of the class's shared names from one + /// view of the split values: over the value set there, when + /// `droppable` accepts it (as [`Self::split_field_mut`]), else as the + /// next value (as [`Self::split_append`]). The write barrier for the + /// value runs first. `Err` hands the value back, touching nothing, + /// with `true` when the old value was refused (the caller declines + /// the whole store) and `false` when the split layout can't take it. + /// + /// # Safety + /// + /// As [`crate::sync::GilCell::peek_mut`]. + #[inline(always)] + pub unsafe fn split_store_at( + &self, + i: usize, + value: Object, + droppable: impl FnOnce(&Object) -> bool, + ) -> Result<(), (Object, bool)> { + let cls = self.cls_raw(); + let Some(keys) = cls.shared_keys.get() else { + return Err((value, false)); + }; + if !value.is_gc_atomic() && self.deferred.get() { + self.ensure_gc_tracked(); + } + // SAFETY: forwarded contract. + let Some(split) = (unsafe { self.dict.split_peek_mut() }) else { + return Err((value, false)); + }; + if let Some(slot) = split.get_over_mut(keys, i) { + if !droppable(slot) { + return Err((value, true)); + } + drop(std::mem::replace(slot, value)); + return Ok(()); + } + if self.c_body.get() != 0 || crate::gil::free_threading_enabled() { + return Err((value, false)); + } + split + .append_over(keys, || cls.shared_keys.share(), i, value) + .map_err(|v| (v, false)) + } + /// The split length and whether position `i` of the class's shared /// names is ready for a store: an overwrite of a set value (which /// `droppable` must accept), or the next of a run of in-order appends @@ -1229,6 +1602,24 @@ impl crate::types::PyInstance { } } + /// Delete attribute `name` through the split layout (see + /// [`SplitValues::remove_str`]): `Some` with the removed value, or with + /// `None` when the instance has no such attribute; `None` when the + /// instance has (or needs) a real dictionary. Runs no code: the caller + /// releases the value. The caller has established that a plain + /// `__dict__` deletion is what this `del` means. + pub fn split_remove(&self, name: &str) -> Option> { + if self.dict.published().is_some() + || self.c_body.get() != 0 + || crate::gil::free_threading_enabled() + || self.cls_raw().native_kind.get() != 0 + { + return None; + } + let mut split = self.dict.split_cell().try_borrow_mut().ok()?; + Some(split.remove_str(name)) + } + /// Store `value` under the interned name `name` through the split /// layout: the displaced value on an overwrite, or `Err` handing the /// value back when the instance needs (or has) a real dictionary. diff --git a/crates/weavepy-vm/src/leaf_plan.rs b/crates/weavepy-vm/src/leaf_plan.rs index 71c1ae9d..5eab94cd 100644 --- a/crates/weavepy-vm/src/leaf_plan.rs +++ b/crates/weavepy-vm/src/leaf_plan.rs @@ -994,21 +994,20 @@ impl Interpreter { /// code, at recursion depth `depth`, once the callee's warm-up is past /// (the frameless call bookkeeping is then only the hit count): /// `None` when the plan has no native code, or the callee one of the - /// tiny shapes `leaf_eval` answers itself; otherwise the result, or - /// `None` inside having done nothing observable. + /// tiny shapes `leaf_eval` answers itself (the caller checked `ext`, + /// `code`'s extension, for those); otherwise the result, or `None` + /// inside having done nothing observable. #[cfg(feature = "jit")] - #[inline] + #[inline(always)] pub(crate) fn leaf_site_native( &self, code: &CodeObject, + ext: &CodeConstObjects, f: &crate::object::PyFunction, args: &[*const Object], depth: usize, ) -> Option> { - let ext = crate::code_vm_ext(code)?; - if ext.pure_leaf.load(std::sync::atomic::Ordering::Relaxed) >= 3 - || code.jit_hint.lean_entries() <= crate::tier2::LEAN_WARM_COMPILE_THRESHOLD_CAP - { + if code.jit_hint.lean_entries() <= crate::tier2::LEAN_WARM_COMPILE_THRESHOLD_CAP { return None; } let plan = ext.leaf_plan.get()?.as_deref()?; @@ -1086,7 +1085,7 @@ impl Interpreter { }}; } let mut consts: &[V] = &plan.consts; - let mut stamps: &[crate::StampSlot] = ext.stamp_slots.get().map_or(&[], |s| &s[..]); + let mut stamps: crate::Sites<'_, crate::StampSlot> = ext.stamp_sites(); let mut owned = Owned::new(); let mut pend = Pending::new(); let mut ops: &[Op] = &plan.ops; @@ -1274,7 +1273,7 @@ impl Interpreter { depth += 1; (code, ext, plan, f) = (&**ccode, cext, cplan, callee); consts = &plan.consts; - stamps = ext.stamp_slots.get().map_or(&[], |s| &s[..]); + stamps = ext.stamp_sites(); ops = &plan.ops; ip = 0; continue; @@ -1321,7 +1320,7 @@ impl Interpreter { let c = unsafe { &*callers.get_unchecked(depth).as_ptr() }; (ip, code, ext, plan, f) = (c.ip, c.code, c.ext, c.plan, c.f); consts = &plan.consts; - stamps = ext.stamp_slots.get().map_or(&[], |s| &s[..]); + stamps = ext.stamp_sites(); ops = &plan.ops; // SAFETY: as above. unsafe { @@ -1559,7 +1558,7 @@ impl Interpreter { fn plan_global( &self, code: &CodeObject, - stamps: &[crate::StampSlot], + stamps: crate::Sites<'_, crate::StampSlot>, f: &crate::object::PyFunction, pc: u16, ) -> Option { @@ -1609,7 +1608,7 @@ impl Interpreter { &self, code: &CodeObject, ext: &CodeConstObjects, - stamps: &[crate::StampSlot], + stamps: crate::Sites<'_, crate::StampSlot>, owned: &mut Owned, pend: &Pending, src: V, @@ -1704,7 +1703,7 @@ impl Interpreter { if (EFFECT && pend.n > 0) || nest >= NEST { return None; } - let slot = ext.method_slots.get()?.get(pc as usize)?; + let slot = ext.method_slot(pc as usize)?; let cls = inst.cls_raw(); // SAFETY: GIL-serialized; nothing here runs Python, so nothing // rebinds the getter or its code, or changes the class. diff --git a/crates/weavepy-vm/src/leaf_plan/jit.rs b/crates/weavepy-vm/src/leaf_plan/jit.rs index c3f7f895..53f3b533 100644 --- a/crates/weavepy-vm/src/leaf_plan/jit.rs +++ b/crates/weavepy-vm/src/leaf_plan/jit.rs @@ -322,7 +322,7 @@ pub(super) fn run( /// [`run`] for a plan whose native code is already compiled, with the /// caller's recursion `depth` in hand: `None` when there is no native /// code (yet), otherwise the evaluation's outcome. -#[inline] +#[inline(always)] pub(super) fn run_compiled( interp: &Interpreter, code: &CodeObject, @@ -400,8 +400,8 @@ unsafe fn cx<'a>(ctx: *mut Ctx<'static>) -> &'a mut Ctx<'a> { /// A frame's stamp slots (its global and class attribute caches). #[inline(always)] -fn stamps(ext: &CodeConstObjects) -> &[crate::StampSlot] { - ext.stamp_slots.get().map_or(&[], |s| &s[..]) +fn stamps(ext: &CodeConstObjects) -> crate::Sites<'_, crate::StampSlot> { + ext.stamp_sites() } unsafe extern "C" fn h_global( @@ -539,10 +539,7 @@ unsafe extern "C" fn h_field( let ver = inst.cls_raw().attr_version.get(); // A property's getter answered (see `plan_getter`): nothing to // remember. - let site = ext - .method_slots - .get() - .and_then(|s| s.get((pc_name & 0xffff) as usize)); + let site = ext.method_slot((pc_name & 0xffff) as usize); // SAFETY: GIL-serialized; the references don't outlive the check. if site.is_some_and(|s| unsafe { s.getter_peek(ver) }.is_some()) { return status; @@ -901,6 +898,13 @@ unsafe impl Send for Engine {} static ENGINE: std::sync::Mutex>> = std::sync::Mutex::new(None); impl Engine { + /// Drop the function and builder contexts for empty ones (see the + /// frame compiler's `Engine::release`). + fn release(&mut self) { + self.ctx = self.module.make_context(); + self.fbctx = FunctionBuilderContext::new(); + } + fn new() -> Option { if !tags_match() { return None; @@ -1032,8 +1036,7 @@ fn compile_with( }; let Some((depth, frames, keep, fields, globals, methods)) = lowered else { // An unfinished function leaves the builder's state behind. - engine.fbctx = FunctionBuilderContext::new(); - engine.module.clear_context(&mut engine.ctx); + engine.release(); return None; }; let defined = engine.module.define_function(id, &mut engine.ctx); @@ -1043,7 +1046,7 @@ fn compile_with( code.qualname ); } - engine.module.clear_context(&mut engine.ctx); + engine.release(); defined.ok()?; engine.module.finalize_definitions().ok()?; let func = engine.module.get_finalized_function(id); diff --git a/crates/weavepy-vm/src/lib.rs b/crates/weavepy-vm/src/lib.rs index 5228eaa8..6fb1dc46 100644 --- a/crates/weavepy-vm/src/lib.rs +++ b/crates/weavepy-vm/src/lib.rs @@ -47,6 +47,7 @@ pub mod builtins; pub mod capi_watchers; pub mod cpython_headers; pub mod descr_registry; +pub mod dictmap; pub mod error; pub mod ext_loader; pub mod fasthash; @@ -101,7 +102,7 @@ use crate::error::{ attribute_error, import_error, index_error, key_error, key_error_object, module_not_found_error, name_error, overflow_error, recursion_error, runtime_error, stop_async_iteration, stop_iteration, stop_iteration_with, type_error, value_error, - zero_division_error, TracebackEntry, + zero_division_error, }; pub use crate::error::{PyException, RuntimeError}; pub use crate::import::ModuleCache; @@ -262,12 +263,6 @@ struct FrameRare { /// handled an exception carries. #[derive(Default)] struct FrameExc { - /// Stack of currently-handled exceptions. `PUSH_EXC_INFO` pushes - /// onto this; `POP_EXCEPT` pops; `RERAISE 1` re-raises the top. - /// Each entry is tagged with the pc just past its handler body - /// (the `PUSH_EXC_INFO` arg) so the unwinder can discard handlers an - /// exception propagates *out of* (see `handle_exception`). - handlers: Vec<(u32, PyException)>, /// A *generator/coroutine* frame's own handled-exception entries, /// detached from the interpreter-wide `exc_info_stack` while it is /// suspended at a `yield`. CPython stores this as the generator's @@ -277,7 +272,7 @@ struct FrameExc { /// are peeled back off so they don't leak into the *resumer's* /// `sys.exc_info()`. Always empty for ordinary frames (they never /// suspend). - saved: Vec, + saved: Vec, /// pc of the instruction whose exception is being handled by a /// *cleanup* handler (`push_lasti` exception-table entries: `with` /// exits, except-variable unbind blocks). CPython pushes this on @@ -325,12 +320,6 @@ impl Frame { self.exc.get_or_insert_with(Box::default) } - /// Pop the innermost [`FrameExc::handlers`] entry. - #[inline] - fn exc_handlers_pop(&mut self) -> Option<(u32, PyException)> { - self.exc.as_mut()?.handlers.pop() - } - /// Whether the frame holds detached [`FrameExc::saved`] entries. #[inline] fn has_saved_exc_info(&self) -> bool { @@ -338,12 +327,12 @@ impl Frame { } /// The innermost [`FrameExc::saved`] entry. - fn saved_exc_info_last(&self) -> Option<&PyException> { + fn saved_exc_info_last(&self) -> Option<&Object> { self.exc.as_ref()?.saved.last() } /// Take the [`FrameExc::saved`] entries. - fn take_saved_exc_info(&mut self) -> Vec { + fn take_saved_exc_info(&mut self) -> Vec { self.exc .as_mut() .map(|e| std::mem::take(&mut e.saved)) @@ -351,7 +340,7 @@ impl Frame { } /// Set the [`FrameExc::saved`] entries. - fn set_saved_exc_info(&mut self, saved: Vec) { + fn set_saved_exc_info(&mut self, saved: Vec) { if saved.is_empty() && self.exc.is_none() { return; } @@ -463,7 +452,7 @@ fn generator_frame_traverse(obj: &Object, visit: &mut dyn FnMut(&Object)) { Object::Generator(g) | Object::Coroutine(g) | Object::AsyncGenerator(g) => g, _ => return, }; - let Ok(state) = g.state.try_borrow() else { + let Ok(state) = g.state_raw().try_borrow() else { return; }; let boxed = match &*state { @@ -878,7 +867,7 @@ pub struct Interpreter { /// Stack of currently-handled exceptions across all frames. The /// top is what `sys.exc_info()` returns. Pushed by /// `PUSH_EXC_INFO`; popped by `POP_EXCEPT`. - pub(crate) exc_info_stack: Rc>>, + pub(crate) exc_info_stack: Rc>>, /// User-installable hook called when an exception escapes the /// top-level frame. Defaults to a Rust builtin that prints the /// canonical CPython-style traceback to `sys.stderr`. @@ -909,9 +898,16 @@ pub struct Interpreter { /// native dict alive (CPython's function keeps the mapping itself), /// so a weak owner would die with the caller's last direct reference. globals_missing_hooks: RefCell)>>, - /// Whether `globals_missing_hooks` has ever been non-empty: the leaf - /// paths' one-load gate before the cell borrow. + /// Whether `globals_missing_hooks` is non-empty (as of its last + /// prune): the leaf paths' one-load gate before the cell borrow. While + /// it's set, every builtin `LOAD_GLOBAL` takes the slow path. globals_missing_any: Cell, + /// Finalizer drains left before the next prune of + /// `globals_missing_hooks` while `globals_missing_any` is set. + globals_missing_prune_in: Cell, + /// Builtin lookups that asked for a `__missing__` owner since the + /// last forced prune (see `globals_missing_owner`). + globals_missing_asks: Cell, /// Non-zero while the VM is lazily loading one of its own machinery /// modules (e.g. `importlib._bootstrap` for `module.__repr__`). In /// CPython those are frozen and fully initialized before user code @@ -934,6 +930,15 @@ pub struct Interpreter { /// invalidate on every growth. #[allow(clippy::vec_box)] inline_pool: Vec>, + /// Emptied activation stacks of finished quiet runs (see + /// [`Self::quiet_run`]), for the next run: a generator its native + /// consumer resumes item by item starts a quiet run per item. + #[allow(clippy::vec_box)] + inl_spares: Vec>>, + /// Finished generators' frame boxes, their frames dropped, for the + /// next generators' frames (see [`Self::box_gen_frame`]). + #[allow(clippy::vec_box)] + gen_box_pool: ThreadCell>>>, /// RFC 0068 (WS9) — recycled tuple allocations, CPython's tuple /// freelist analogue (one LIFO bucket per length 1..=16, like /// CPython's per-size freelists). A refcount-dead, untracked, @@ -988,11 +993,6 @@ pub struct Interpreter { /// exact per-instruction event stream. Refreshed from the dispatch /// loop's [`crate::trace::ObserverSnapshot`] every iteration. fuse_off: bool, - /// A handled exception was just released (`POP_EXCEPT`): the running - /// frame's object may have lost its last outside holder (the - /// traceback), so the dispatch loop re-probes it on the next - /// instruction instead of waiting for its stride. - recheck_frame_observed: bool, /// `WEAVEPY_NO_QUIET`: pin every dispatch-loop iteration to the full /// prologue (RFC 0065 bisection aid). Read once at construction so a /// frame entry does not pay a `OnceLock` probe for it (RFC 0077 WS3). @@ -1008,6 +1008,10 @@ pub struct Interpreter { /// ever dereferenced on the thread that pushed them, while the /// activations they name are live. lean_pending: Vec, + /// Spare [`ChainRec`]s (empty), boxed: a parked chain's levels point + /// at their record. + #[allow(clippy::vec_box)] + chain_pool: Vec>, /// The builtins the leaf burst may call directly (see [`LeafFns`]), /// resolved on first use. leaf_fns: std::cell::OnceCell, @@ -1025,20 +1029,33 @@ pub struct Interpreter { core_truth: ThreadCell>, /// `WP_DBG_SAMPLE`: periodic frame-entry sampling to stderr. dbg_sample: bool, + /// The GIL, held while the fields above drop (see the `Drop` impl). + /// Last, so that it is released after every other field. + drop_gil: crate::gil::GilScope, +} + +impl Drop for Interpreter { + fn drop(&mut self) { + // The fields release the interpreter's objects: its module cache, + // pools and caches hold the last references to most of them, and + // tracked objects are visible to every thread's collections. Hold + // the GIL while they go, as construction does (`drop_gil` is the + // last field, so it gives the GIL back after the others). + self.drop_gil.engage(); + } } impl Default for Interpreter { fn default() -> Self { - // Register this thread before touching any cell. Construction - // populates the *process-global* collector and module cache, and - // `GilCell`'s lock-free path is only sound while a single thread - // owns every cell — a second thread building its own interpreter - // (an embedder, or `cargo test`'s parallel harness) has to flip - // cells to shared first, or both take the unlocked path over the - // same `GcState` and one loses with `BorrowMutError`. The GIL - // acquire path registers for every *later* entry; this covers the - // window before a thread has ever held it. - crate::sync::note_vm_thread(crate::gil::current_thread_id()); + // Construction populates the *process-global* collector and module + // cache, so it holds the GIL like any other code that touches + // objects: a collection running on another thread (another + // interpreter's, in an embedder or `cargo test`'s parallel harness) + // reads every tracked object and the collector's own lists without + // taking their cells' borrows. Taking the GIL also registers this + // thread before it touches any cell, which `GilCell`'s lock-free + // path requires. + let _gil = crate::gil::hold_gil(); install_parser_unicode_hook(); // The UCRT's default response to an invalid parameter (e.g. a CRT // call on a stale fd) is a *silent* process fast-fail (exit @@ -1147,7 +1164,8 @@ impl Default for Interpreter { // frames (their `Frame` type is private to this module). static GEN_TRAVERSE: std::sync::Once = std::sync::Once::new(); GEN_TRAVERSE.call_once(|| { - crate::gc_trace::register_traverse( + crate::gc_trace::register_traverse_for( + crate::gc_trace::hook_kind::GENERATOR, |o| { matches!( o, @@ -1161,17 +1179,23 @@ impl Default for Interpreter { // live set it walks. Teach the cycle GC to trace through it so // e.g. `obj.x = iter(set_containing_obj)` is collectable // (`test_set.test_container_iterator`). - crate::gc_trace::register_traverse(|o| matches!(o, Object::Iter(_)), iter_traverse); + crate::gc_trace::register_traverse_for( + crate::gc_trace::hook_kind::ITER, + |o| matches!(o, Object::Iter(_)), + iter_traverse, + ); // A dying exception's `__traceback__` is often the sole owner of // the unwound frames — and their locals — below it; CPython's // refcounting frees that whole chain the instant the exception // dies. Teach the prompt-reap cascade (and anything else walking // `traverse_object`) to follow traceback → frame → locals. - crate::gc_trace::register_traverse( + crate::gc_trace::register_traverse_for( + crate::gc_trace::hook_kind::TRACEBACK, |o| matches!(o, Object::Traceback(_)), py_traceback_traverse, ); - crate::gc_trace::register_traverse( + crate::gc_trace::register_traverse_for( + crate::gc_trace::hook_kind::FRAME, |o| matches!(o, Object::Frame(_)), py_frame_traverse, ); @@ -1233,9 +1257,13 @@ impl Default for Interpreter { unraisable_hook, globals_missing_hooks: RefCell::new(Vec::new()), globals_missing_any: Cell::new(false), + globals_missing_prune_in: Cell::new(0), + globals_missing_asks: Cell::new(0), internal_import_depth: 0, frame_locals_pool: ThreadCell::new(Vec::new()), inline_pool: Vec::new(), + inl_spares: Vec::new(), + gen_box_pool: ThreadCell::new(Vec::new()), tuple_pool: ThreadCell::new(std::array::from_fn(|_| Vec::new())), frame_shell_pool: ThreadCell::new(Vec::new()), frame_stack_pool: ThreadCell::new(Vec::new()), @@ -1244,17 +1272,18 @@ impl Default for Interpreter { direct_calls: std::cell::Cell::new(0), sum_fold: None, fuse_off: false, - recheck_frame_observed: false, quiet_off: crate::hot_gates::env_flags::no_quiet(), burst_on: !crate::hot_gates::env_flags::no_burst() && !crate::hot_gates::env_flags::no_quiet() && !Self::locals_fast_off(), lean_pending: Vec::new(), + chain_pool: Vec::new(), leaf_fns: std::cell::OnceCell::new(), leaf_opaque: ThreadCell::new((0, leaf_builtins::LeafMap::default())), core_next: ThreadCell::new(None), core_truth: ThreadCell::new(None), dbg_sample: crate::hot_gates::env_flags::dbg_sample(), + drop_gil: crate::gil::GilScope::idle(), }; // RFC 0025: publish the shared parts of this interpreter // (builtins / module cache / stdout / hooks) so workers @@ -1361,9 +1390,13 @@ impl Interpreter { unraisable_hook: self.unraisable_hook.clone(), globals_missing_hooks: RefCell::new(Vec::new()), globals_missing_any: Cell::new(false), + globals_missing_prune_in: Cell::new(0), + globals_missing_asks: Cell::new(0), internal_import_depth: 0, frame_locals_pool: ThreadCell::new(Vec::new()), inline_pool: Vec::new(), + inl_spares: Vec::new(), + gen_box_pool: ThreadCell::new(Vec::new()), tuple_pool: ThreadCell::new(std::array::from_fn(|_| Vec::new())), frame_shell_pool: ThreadCell::new(Vec::new()), frame_stack_pool: ThreadCell::new(Vec::new()), @@ -1372,17 +1405,18 @@ impl Interpreter { direct_calls: std::cell::Cell::new(0), sum_fold: None, fuse_off: false, - recheck_frame_observed: false, quiet_off: crate::hot_gates::env_flags::no_quiet(), burst_on: !crate::hot_gates::env_flags::no_burst() && !crate::hot_gates::env_flags::no_quiet() && !Self::locals_fast_off(), lean_pending: Vec::new(), + chain_pool: Vec::new(), leaf_fns: std::cell::OnceCell::new(), leaf_opaque: ThreadCell::new((0, leaf_builtins::LeafMap::default())), core_next: ThreadCell::new(None), core_truth: ThreadCell::new(None), dbg_sample: crate::hot_gates::env_flags::dbg_sample(), + drop_gil: crate::gil::GilScope::idle(), } } @@ -1875,6 +1909,8 @@ impl Interpreter { /// `-S` is active; another explicit call would repeat `.pth` processing. /// Startup import errors retain their best-effort handling. pub fn run_site(&mut self) -> Result<(), RuntimeError> { + #[cfg(feature = "jit")] + crate::tier2::prewarm_at_startup(); #[cfg(feature = "jit")] let _compile_guard = crate::tier2::startup_compilation_scope(); // Startup runs bytecode too (site/.pth imports can allocate enough @@ -2554,6 +2590,28 @@ impl Interpreter { } } + /// [`Self::release`] with a shared value's plain decrement in line (the + /// core loop's arms that end a binding): only a last owner's release, + /// or one an observer watches, takes the full path. + #[inline(always)] + fn release_hot(&self, dropped: Object) { + let Some(word) = dropped.strong_word() else { + return std::mem::forget(dropped); + }; + // A clear gate word: the bias holds (this thread alone updates + // counts) and no observer watches releases. + if crate::sync::release_gates() == 0 { + // SAFETY: `dropped` owns a reference to the live allocation. + let w = unsafe { &*word }; + let c = w.load(std::sync::atomic::Ordering::Relaxed); + if c != 1 { + w.store(c - 1, std::sync::atomic::Ordering::Relaxed); + return std::mem::forget(dropped); + } + } + self.release(dropped); + } + /// Release a finished call's arguments now, before the caller handles /// the result (CPython's `CALL` decrefs its operands first): an /// argument only the call held dies here, finalizers and all. @@ -2705,6 +2763,10 @@ impl Interpreter { /// `sys.unraisablehook` (the default hook prints `Exception ignored /// in: …` to stderr, exactly like CPython) so they don't propagate. pub fn run_pending_finalizers(&mut self) -> usize { + // (Before the drain: an owner the prune lets go of may queue one.) + if self.globals_missing_any.get() { + self.prune_globals_missing_hooks_sometimes(); + } // RFC 0077 (WS2): the prompt reaper drains after every node it // tears down, and for the overwhelming majority nothing was // queued. Answer that without publishing the interpreter pointer @@ -2751,7 +2813,7 @@ impl Interpreter { // finalized and clear its deferral flag so the next collection // treats it as plain garbage (if it wasn't resurrected) and // never runs `__del__` a second time. - crate::gc_trace::complete_finalizer(crate::weakref_registry::id_of(&obj)); + crate::gc_trace::complete_finalizer(&obj); } // Weakref callbacks run after finalizers (CPython's order); // errors route through the unraisable hook. WeavePy reaps at @@ -3062,29 +3124,22 @@ impl Interpreter { Some(Object::Module(m)) => m.dict.borrow().iter().map(|(_k, v)| v.clone()).collect(), _ => Vec::new(), }; - let mut sys_deferred: Vec<(crate::sync::Rc, Object)> = - Vec::new(); + let mut sys_deferred: Vec = Vec::new(); for _ in 0..8 { let candidates = crate::gc_trace::finalization_candidates(); if candidates.is_empty() { break; } - for (handle, obj) in candidates { + for obj in candidates { if sys_values.iter().any(|v| v.is_same(&obj)) { - if !sys_deferred - .iter() - .any(|(h, _)| crate::sync::Rc::ptr_eq(h, &handle)) - { - sys_deferred.push((handle, obj)); + if !sys_deferred.iter().any(|o| o.is_same(&obj)) { + sys_deferred.push(obj); } continue; } - // `swap` claims the finalizer so the cycle collector - // and a later shutdown pass can't double-run it. - if handle - .finalized - .swap(true, std::sync::atomic::Ordering::AcqRel) - { + // Claiming the finalizer means the cycle collector and a + // later shutdown pass can't double-run it. + if !crate::gc_trace::claim_finalizer(&obj) { continue; } self.invoke_finalizer(&obj); @@ -3094,11 +3149,8 @@ impl Interpreter { } if !sys_deferred.is_empty() { crate::vm_singletons::set_unraisable_silenced(true); - for (handle, obj) in sys_deferred { - if handle - .finalized - .swap(true, std::sync::atomic::Ordering::AcqRel) - { + for obj in sys_deferred { + if !crate::gc_trace::claim_finalizer(&obj) { continue; } self.invoke_finalizer(&obj); @@ -3204,8 +3256,8 @@ impl Interpreter { // the raised warning routes through the unraisable hook, // with the coroutine itself as the hook's object. if let Object::Coroutine(g) = obj { - if matches!(&*g.state.borrow(), GeneratorState::Created(_)) { - *g.state.borrow_mut() = GeneratorState::Finished; + if matches!(&*g.state().borrow(), GeneratorState::Created(_)) { + *g.state().borrow_mut() = GeneratorState::Finished; let qualname = g.qualname().to_str(); self.warn_unawaited_coroutine(obj, &qualname); return true; @@ -3305,11 +3357,7 @@ impl Interpreter { Object::Instance(i) => Object::Type(i.cls()), _ => Object::None, }; - ( - inst, - ty, - pyexc.traceback.iter().cloned().collect::>(), - ) + (inst, ty, pyexc.traceback_entries()) } other => { let inst = crate::builtin_types::make_exception("RuntimeError", other.to_string()); @@ -3900,6 +3948,34 @@ impl Interpreter { Rc::new(RefCell::new(v)) } + /// An empty locals vector with room for `n`, recycled when the pool + /// has one this frame can own (see [`Self::pooled_locals_from_args`]). + #[inline] + fn pooled_locals_empty(&self, n: usize) -> Rc>> { + let pooled = { + let mut pool = self.frame_locals_pool.borrow_mut(); + loop { + match pool.pop() { + Some(rc) if Rc::strong_count(&rc) == 1 => break Some(rc), + // Still shared: only our clone is dropped (no element + // destructor runs under the borrow). + Some(_) => (), + None => break None, + } + } + }; + match pooled { + Some(rc) => { + // SAFETY: sole owner, checked at the pop above. + let v = unsafe { &mut *rc.as_ptr() }; + debug_assert!(v.is_empty()); + v.reserve(n); + rc + } + None => Rc::new(RefCell::new(Vec::with_capacity(n))), + } + } + /// RFC 0061 (WS3b): fetch a recycled argument-staging vector, or /// allocate one. Deliberately a separate pool from /// [`Self::pooled_stack`] — see the `scratch_pool` field docs. @@ -3953,7 +4029,7 @@ impl Interpreter { // bookkeeping), which must not observe a held pool borrow. // SAFETY: sole owner (checked above) — no other path can // reach this vector, including the drop glue of its elements. - unsafe { (*frame.locals.as_ptr()).clear() }; + unsafe { release_locals(&mut *frame.locals.as_ptr()) }; let mut pool = self.frame_locals_pool.borrow_mut(); if pool.len() < POOL_CAP { pool.push(frame.locals.clone()); @@ -3961,6 +4037,36 @@ impl Interpreter { } } + /// `frame` boxed for a new generator: in a finished generator's box + /// (see [`Self::recycle_gen_box`]) when the pool has one. + #[inline] + fn box_gen_frame(&self, frame: Frame) -> Box { + let spare = self.gen_box_pool.borrow_mut().pop(); + match spare { + Some(b) => Box::write(b, frame), + None => Box::new(frame), + } + } + + /// A finished generator's frame box: the frame is dropped here (what + /// dropping the box would do) and the allocation kept for the next + /// generator's (see [`Self::box_gen_frame`]). + fn recycle_gen_box(&self, boxed: Box) { + const POOL_CAP: usize = 32; + let raw = Box::into_raw(boxed); + // SAFETY: the frame is dropped in place once, and its allocation + // goes on as uninitialized storage (freed as such past the cap). + // The frame's drop glue runs before the pool's borrow. + let spare = unsafe { + std::ptr::drop_in_place(raw); + Box::from_raw(raw.cast::>()) + }; + let mut pool = self.gen_box_pool.borrow_mut(); + if pool.len() < POOL_CAP { + pool.push(spare); + } + } + fn make_frame( &self, code: Rc, @@ -4308,7 +4414,7 @@ impl Interpreter { shell .lasti .store(pc as u32, std::sync::atomic::Ordering::Relaxed); - py_frame.lasti.set(pc as u32); + py_frame.set_lasti(pc as u32); } } if let Err(e) = self.fire_call_event(&py_frame, mon_event, Object::None) { @@ -4511,11 +4617,6 @@ impl Interpreter { let quiet_off = self.quiet_off; let mut loop_snap_gen: u64 = 0; // stale → first iteration derives let mut loop_quiet = false; - // The loops are off only because a frame object is observed (see - // `frame_object_observed`): re-derive once nothing outside the - // activation holds it any more (an `except` clause dropped the - // traceback). - let mut frame_blocks_quiet = false; let result = 'activation: loop { // RFC 0039 (WS2) / RFC 0059 (WS2): cooperative GIL hand-off. // A plain interpreter-local countdown — one register @@ -4532,25 +4633,13 @@ impl Interpreter { // a prologue input changed. The observer snapshot refresh // rides the same generation (observer mutation bumps it). let lgen = crate::hot_gates::loop_gen(); - // The frame object's holder (a live traceback, a - // `sys._getframe` handle) is re-probed on a stride, not per - // instruction: the probe reads a cell and a reference count, - // and an exception handler paid it for every instruction it - // ran. A few extra instructions on the full path after the - // holder goes away cost far less. - let rederive = frame_blocks_quiet - && (std::mem::take(&mut self.recheck_frame_observed) - || self.gil_countdown.trailing_zeros() >= 4) - && !Self::frame_object_observed(&shell, py_frame_slot.as_ref(), frame); - if lgen != loop_snap_gen || rederive { + if lgen != loop_snap_gen { loop_snap_gen = lgen; obs.refresh(); self.fuse_off = obs.any; - let unobserved = !quiet_off && crate::hot_gates::load() == 0 && !obs.any; - let frame_observed = - Self::frame_object_observed(&shell, py_frame_slot.as_ref(), frame); - frame_blocks_quiet = unobserved && frame_observed; - loop_quiet = unobserved && !frame_observed; + // A frame object of this activation doesn't keep the loops + // off: it reads `lasti` from the shell (see `PyFrame::live`). + loop_quiet = !quiet_off && crate::hot_gates::load() == 0 && !obs.any; } // The leaf burst: while the loop is quiet, run the straight // run of leaf instructions at `frame.pc` in one tight loop @@ -4585,27 +4674,11 @@ impl Interpreter { } else { None }; - // A frame object only this activation holds skipped the - // per-instruction `lasti` sync: bring it current before the - // prologue (or a raise's traceback) reads it. - if quiet_exit.is_some() - && shell - .has_materialized - .load(std::sync::atomic::Ordering::Relaxed) - { - // The instruction that just ran (or raised), as the - // per-instruction sync would have left it; after a - // yield back to the prologue, the next one. - let at = match &quiet_exit { - Some(QuietExit::Outcome { cur_pc, .. }) => *cur_pc as u32, - _ => frame.pc, - }; - if let Some(py) = shell.materialized.borrow().as_ref() { - py.lasti.set(at); - } - } else if let Some(exit) = &quiet_exit { - // Likewise the shell a lazy traceback entry will - // materialize from (see `pop_frame_shell`). + // The shell a frame object reads its `lasti` from, or a lazy + // traceback entry will materialize from (see + // `pop_frame_shell`), at the instruction that just ran (or + // raised); a yield back to the prologue left it at the next. + if let Some(exit) = &quiet_exit { Self::sync_lazy_tb_lasti(Some(&shell), &frame.code, exit); } match quiet_exit { @@ -4623,37 +4696,10 @@ impl Interpreter { shell .lasti .store(frame.pc, std::sync::atomic::Ordering::Relaxed); - if shell - .has_materialized - .load(std::sync::atomic::Ordering::Relaxed) - { - if let Some(py) = shell.materialized.borrow().as_ref() { - py.lasti.set(frame.pc); - } - } instruction_ran = true; self.step_hot(frame) } } - } else if frame_blocks_quiet { - // Quiet but for a frame object something outside holds (an - // exception's traceback, while its handler runs): nothing - // the full prologue serves is pending, so each instruction - // only brings the frame's `lasti` current before it runs. - cur_pc = frame.pc as usize; - shell - .lasti - .store(frame.pc, std::sync::atomic::Ordering::Relaxed); - if shell - .has_materialized - .load(std::sync::atomic::Ordering::Relaxed) - { - self.ensure_top_py_frame(&mut py_frame_slot) - .lasti - .set(frame.pc); - } - instruction_ran = true; - self.step_hot(frame) } else { // RFC 0059 (WS2): the unified eval-breaker word. One relaxed // load answers "is *any* deferred work pending?" for the six @@ -4745,7 +4791,7 @@ impl Interpreter { self.fuse_off = obs.any; if obs.any && !is_gen_bootstrap { let py_frame = self.ensure_top_py_frame(&mut py_frame_slot); - py_frame.lasti.set(frame.pc); + py_frame.set_lasti(frame.pc); let line = py_frame.current_lineno(); // RFC 0051 (WS4): CPython 3.13 line-event semantics. // A `'line'` event fires when execution reaches an @@ -5219,7 +5265,7 @@ impl Interpreter { // fires at the handler entry. if let Some(inst) = handled_arg { let py_frame = self.ensure_top_py_frame(&mut py_frame_slot); - py_frame.lasti.set(frame.pc); + py_frame.set_lasti(frame.pc); if let Err(mon_e) = self.fire_monitoring_event( &py_frame, crate::trace::EVENT_EXCEPTION_HANDLED, @@ -5428,7 +5474,7 @@ impl Interpreter { } let materialized = frame.py_frame.clone(); if let Some(existing) = &materialized { - existing.lasti.set(frame.pc); + existing.set_lasti(frame.pc); existing.invalidate_locals(); existing.on_stack.set(existing.on_stack.get() + 1); } @@ -5443,6 +5489,9 @@ impl Interpreter { cached .has_materialized .store(materialized.is_some(), std::sync::atomic::Ordering::Relaxed); + if let Some(py) = &materialized { + cached.link(py); + } *cached.materialized.borrow_mut() = materialized; let shell = cached.clone(); self.frame_stack.borrow_mut().push(shell.clone()); @@ -5452,7 +5501,7 @@ impl Interpreter { frame.code.is_generator || frame.code.is_coroutine || frame.code.is_async_generator; let materialized = frame.py_frame.clone(); if let Some(existing) = &materialized { - existing.lasti.set(frame.pc); + existing.set_lasti(frame.pc); existing.invalidate_locals(); existing.on_stack.set(existing.on_stack.get() + 1); } @@ -5505,6 +5554,9 @@ impl Interpreter { *m.gen_owner.get_mut() = gen_owner; m.lasti = std::sync::atomic::AtomicU32::new(frame.pc); m.has_materialized = std::sync::atomic::AtomicBool::new(materialized.is_some()); + if let Some(py) = &materialized { + m.link(py); + } *m.materialized.get_mut() = materialized; self.frame_stack.borrow_mut().push(pooled.clone()); return pooled; @@ -5526,6 +5578,9 @@ impl Interpreter { materialized: RefCell::new(materialized), tb_refs: std::sync::atomic::AtomicU32::new(0), }); + if let Some(py) = shell.materialized.borrow().as_ref() { + shell.link(py); + } self.frame_stack.borrow_mut().push(shell.clone()); shell } @@ -5539,14 +5594,31 @@ impl Interpreter { /// nothing may stay pinned until reuse. fn recycle_frame_shell(&self, mut shell: Rc) { const FRAME_SHELL_POOL_CAP: usize = 64; - if shell.is_gen - || shell - .has_materialized - .load(std::sync::atomic::Ordering::Relaxed) - || self.frame_shell_pool.borrow().len() >= FRAME_SHELL_POOL_CAP - { + if shell.is_gen || self.frame_shell_pool.borrow().len() >= FRAME_SHELL_POOL_CAP { return; } + if shell + .has_materialized + .load(std::sync::atomic::Ordering::Relaxed) + { + // A frame object nothing but the shell holds (a `sys._getframe` + // handle since dropped) dies with the activation, as CPython's + // does; one anything else holds keeps the shell too. + let Some(m) = Rc::get_mut(&mut shell) else { + return; + }; + if !m + .materialized + .get_mut() + .as_ref() + .is_some_and(|py| Rc::strong_count(py) == 1) + { + return; + } + let py = m.materialized.get_mut().take(); + *m.has_materialized.get_mut() = false; + drop(py); + } if let Some(m) = Rc::get_mut(&mut shell) { m.code.clear(); m.locals.clear(); @@ -5567,6 +5639,7 @@ impl Interpreter { fn push_materialized_frame(&self, py: &Rc) { py.on_stack.set(py.on_stack.get() + 1); let shell = Rc::new(crate::object::FrameShell::from_py_frame(py)); + shell.link(py); self.frame_stack.borrow_mut().push(shell); } @@ -5609,40 +5682,6 @@ impl Interpreter { /// Dispatch-loop helper: materialise the current activation's /// `PyFrame` once and cache it in the loop-local slot. - /// Whether this activation's frame object (if one was materialized) - /// is reachable from anything but the activation's own bookkeeping — - /// the shell's cell, the loop's slot, the frame's link: a traceback - /// or a Python reference that may read `f_lineno` at any moment, so - /// the loop keeps its `lasti` current instruction by instruction. - /// Otherwise the quiet loops may run, syncing it whenever they hand - /// back and whenever the object is fetched again (see - /// `FrameShell::materialize`). - fn frame_object_observed( - shell: &crate::object::FrameShell, - slot: Option<&Rc>, - frame: &Frame, - ) -> bool { - if !shell - .has_materialized - .load(std::sync::atomic::Ordering::Relaxed) - { - return false; - } - // Borrowed, not cloned: this runs per instruction while a - // traceback holds the frame object, and the clone's own count - // would be two more atomics each time. - let Ok(cell) = shell.materialized.try_borrow() else { - return true; - }; - let Some(py) = cell.as_ref() else { - return false; - }; - let own = 1 - + usize::from(slot.is_some_and(|s| Rc::ptr_eq(s, py))) - + usize::from(frame.py_frame.as_ref().is_some_and(|p| Rc::ptr_eq(p, py))); - Rc::strong_count(py) > own - } - fn ensure_top_py_frame(&self, slot: &mut Option>) -> Rc { if let Some(py) = slot { return py.clone(); @@ -5697,6 +5736,7 @@ impl Interpreter { extra_locals: RefCell::new(None), cleared: Cell::new(false), lazy_back: RefCell::new(None), + live: std::sync::atomic::AtomicPtr::new(std::ptr::null_mut()), }) } @@ -5712,11 +5752,10 @@ impl Interpreter { frame.stack.pop(); } for _ in 0..jump.exc_pops { - frame.exc_handlers_pop(); self.exc_info_stack.borrow_mut().pop(); } frame.pc = jump.target_pc; - py_frame.lasti.set(jump.target_pc); + py_frame.set_lasti(jump.target_pc); py_frame.override_lineno.set(None); // Force a fresh 'line' event at the landing site. py_frame.last_line.set(None); @@ -5772,7 +5811,7 @@ impl Interpreter { } let suspended = event == TraceEvent::Yield; let (jump, resolved_line) = - crate::linejump::compute_jump(&fr.code, fr.lasti.get(), new_lineno, suspended)?; + crate::linejump::compute_jump(&fr.code, fr.lasti_now(), new_lineno, suspended)?; // CPython binds `None` to any still-unbound local at the target // (rather than crashing on a LOAD_FAST of a name the compiler // "proved" bound), warning first so an escalating filter can @@ -5841,7 +5880,7 @@ impl Interpreter { } let owner = py.gen_owner.borrow().as_ref().and_then(|w| w.upgrade()); if let Some(g) = owner { - let state_kind = match &*g.state.borrow() { + let state_kind = match &*g.state().borrow() { GeneratorState::Running | GeneratorState::Delegating(_) => 0u8, GeneratorState::Suspended(_) => 1, GeneratorState::Created(_) => 2, @@ -5870,7 +5909,7 @@ impl Interpreter { // Tear down the never-started generator: its frame // locals (bound arguments) die now, like CPython's // refcount-driven dealloc. - *g.state.borrow_mut() = GeneratorState::Finished; + *g.state().borrow_mut() = GeneratorState::Finished; Self::wipe_frame_locals(py); return Ok(Object::None); } @@ -6059,9 +6098,10 @@ impl Interpreter { } /// A quiet loop leaves its shell's `lasti` behind the instruction it - /// stopped on. A lazy traceback entry materializes from the shell - /// once the activation leaves the spine (see `pop_frame_shell`), so - /// bring it current for the frame object's final `f_lineno`. + /// stopped on. A frame object reads it from there (see + /// `PyFrame::live`), and a lazy traceback entry materializes from the + /// shell once the activation leaves the spine (see `pop_frame_shell`), + /// so bring it current for the frame object's final `f_lineno`. /// A `RERAISE` leaves the restored raise site there itself (PEP 626). #[inline] fn sync_lazy_tb_lasti( @@ -6070,12 +6110,11 @@ impl Interpreter { exit: &QuietExit, ) { if let (Some(shell), QuietExit::Outcome { cur_pc, stepped }) = (shell, exit) { - if shell.tb_refs.load(std::sync::atomic::Ordering::Relaxed) != 0 - && !(stepped.is_err() - && code - .instructions - .get(*cur_pc) - .is_some_and(|i| i.op == OpCode::Reraise)) + if !(stepped.is_err() + && code + .instructions + .get(*cur_pc) + .is_some_and(|i| i.op == OpCode::Reraise)) { shell .lasti @@ -6106,11 +6145,8 @@ impl Interpreter { let existing = caller.materialized.borrow().clone(); match existing { Some(back) => { - // A new holder of the caller's frame object: its loop - // re-derives whether the object is observed. caller.refresh_materialized(&back); py.set_back(Some(back)); - crate::hot_gates::bump_loop_gen(); } None => { *py.lazy_back.borrow_mut() = Some(crate::object::LazyShellRef::new(caller)); @@ -6148,6 +6184,7 @@ impl Interpreter { return popped; } if let Some(py) = shell.materialized.borrow().as_ref() { + py.unlink_live(shell); py.on_stack.set(py.on_stack.get().saturating_sub(1)); // A generator-family frame that just suspended (yielded) // or finished is no longer reachable from a live caller. @@ -6176,7 +6213,7 @@ impl Interpreter { if !matches!(g.code, Object::None) { return g.code.clone(); } - match &*g.state.borrow() { + match &*g.state().borrow() { GeneratorState::Created(frame) | GeneratorState::Suspended(frame) | GeneratorState::Delegating(frame) => Object::Code(frame.code.clone()), @@ -6191,7 +6228,7 @@ impl Interpreter { /// single `gi_frame` alive for the generator's lifetime). `None` once /// the generator has finished. fn gen_py_frame(&self, g: &Rc) -> Object { - let mut state = g.state.borrow_mut(); + let mut state = g.state().borrow_mut(); // A collapsed chain's generator is executing: its frame is on the // spine once anything flushed it (see `Self::gen_frame_attr`), and // otherwise as a suspended one's would be. @@ -6286,7 +6323,7 @@ impl Interpreter { /// not delegating. A frame parked in a delegation sits just past the /// `SEND`/`YIELD_VALUE` pair with the delegate at top-of-stack. fn gen_yieldfrom(&self, g: &Rc) -> Object { - let state = g.state.borrow(); + let state = g.state().borrow(); if let GeneratorState::Suspended(frame) = &*state { { let pc = frame.pc as usize; @@ -6703,7 +6740,7 @@ impl Interpreter { let tb = PyTraceback::new( py_frame.clone(), py_frame.last_line.get().unwrap_or(1), - py_frame.lasti.get(), + py_frame.lasti_now(), None, ); *tb.next.borrow_mut() = inherited_tb.clone(); @@ -6974,7 +7011,7 @@ impl Interpreter { if crate::trace::monitoring_union_mask_cached() & crate::trace::event_mask(event_idx) == 0 { return Ok(()); } - let pc = py_frame.lasti.get(); + let pc = py_frame.lasti_now(); let code = py_frame.code.clone(); let code_obj = Object::Code(code.clone()); let offset = Object::Int(i64::from(code.cpython_lasti(pc))); @@ -7473,8 +7510,9 @@ impl Interpreter { let maybe_dead = gc_trace::maybe_dead_flag(); // The root activation's last executed pc (its `prev_pc` feed). let mut last = usize::MAX; - // The inline activations, innermost last. - let mut inl: Vec> = Vec::new(); + // The inline activations, innermost last (in a finished run's + // emptied vector, when one is spare). + let mut inl: Vec> = self.inl_spares.pop().unwrap_or_default(); // Every access below goes through these handles (see // `CoreSwitch`): the core loop's in-loop calls and returns move // the running activation through the same ones. @@ -7546,15 +7584,20 @@ impl Interpreter { FrameEv::Switched(stop) => QuietEntry::Stop(stop), FrameEv::Exit(exit) => { let Some(mut done) = inl.pop() else { + // (Empty: the vector goes back for the next run.) + const SPARES_CAP: usize = 16; + if inl.capacity() != 0 && self.inl_spares.len() < SPARES_CAP { + self.inl_spares.push(std::mem::take(inl)); + } return exit; }; if done.gen.is_some() { let result = self.inline_gen_finish(&mut done, exit); - if !done.delegates.is_empty() { + if done.chain.is_some() { if matches!(result, Ok(GenStep::Yielded(_))) - && !Self::collapse_flushed(&done) + && !self.collapse_flushed(&done) { - self.core_uncollapse(&mut done); + self.collapse_park(&mut done); } else { // The chain's innermost level takes the // result (a yield on the spine, all of @@ -7562,7 +7605,7 @@ impl Interpreter { let all = matches!(result, Ok(GenStep::Yielded(_))); let mut levels = Vec::new(); let mut level = self.collapse_expand_one(&mut done); - while all && !level.delegates.is_empty() { + while all && level.chain.is_some() { let outer = self.collapse_expand_one(&mut level); levels.push(level); level = outer; @@ -7622,6 +7665,29 @@ impl Interpreter { } } + /// Whether the GIL countdown is down to `floor` with a hand-off to + /// make: the quiet paths' calls, returns and back edges then yield to + /// the outer loop's checkpoint. A countdown that runs out with no + /// thread waiting starts over in place instead (the checkpoint would + /// do nothing else), so a busy single thread doesn't unwind its whole + /// native call nest every 128 calls. + #[inline(always)] + pub(crate) fn countdown_out(&mut self, floor: u32) -> bool { + self.gil_countdown <= floor && !self.countdown_refill() + } + + /// [`Self::countdown_out`]'s cold half: `true` when the countdown + /// started over. + #[cold] + #[inline(never)] + pub(crate) fn countdown_refill(&mut self) -> bool { + if crate::gil::handoff_idle() { + self.gil_countdown = crate::gil::GIL_CHECK_INTERVAL; + return true; + } + false + } + /// After the quiet loop caught an exception: whether the activation /// yields as the outer loop's per-instruction prologue would (the GIL /// countdown, a hot gate). Code that only calls and catches, such as @@ -7629,7 +7695,7 @@ impl Interpreter { /// never let another thread or a signal in. #[inline] fn quiet_caught_yields(&mut self, snap_gen: u64) -> bool { - if self.gil_countdown <= 2 { + if self.countdown_out(2) { return true; } self.gil_countdown -= 1; @@ -7663,7 +7729,7 @@ impl Interpreter { // lean paths below. QuietEntry::Returned { cur_pc } => { *last = cur_pc; - if self.gil_countdown <= 2 { + if self.countdown_out(2) { break 'run QuietExit::Yield; } self.gil_countdown -= 1; @@ -7703,7 +7769,9 @@ impl Interpreter { let stop = match pending.take() { Some(stop) => stop, None => { - let mut sw = CoreSwitch::enter(roots, frame, shell, last); + let calls_ok = self.inline_calls_ok(); + let mut sw = + CoreSwitch::enter(roots, frame, shell, last, calls_ok, snap_gen); let stop = self.leaf_burst(&mut sw, snap_gen); if sw.switched() { return FrameEv::Switched(stop); @@ -7833,7 +7901,7 @@ impl Interpreter { }); } *last = cur_pc; - if self.gil_countdown <= 2 { + if self.countdown_out(2) { break 'run QuietExit::Yield; } self.gil_countdown -= 1; @@ -7880,16 +7948,20 @@ impl Interpreter { return FrameEv::Call(act); } } + // (A site whose loads keep failing goes straight to the full + // handler, which raises a certain miss without the lanes.) + let attr_failing = + op_before == Some(OpCode::LoadAttr) && failing_attr_site(&frame.code, cur_pc); // `inst.prop` for a plain `property`: its getter runs as an // inline activation, like an inline call. - if op_before == Some(OpCode::LoadAttr) && self.inline_calls_ok() { + if op_before == Some(OpCode::LoadAttr) && !attr_failing && self.inline_calls_ok() { if let Some(act) = self.try_inline_property(frame, shell, cur_pc) { return FrameEv::Call(act); } } // Otherwise as a lean activation; `for x in gen` resumes // the generator as one. - if matches!(op_before, Some(OpCode::LoadAttr | OpCode::ForIter)) { + if matches!(op_before, Some(OpCode::LoadAttr | OpCode::ForIter)) && !attr_failing { let loaded = if op_before == Some(OpCode::LoadAttr) { self.try_lean_property(frame, shell, snap_gen, cur_pc) } else { @@ -7917,7 +7989,7 @@ impl Interpreter { }); } *last = cur_pc; - if self.gil_countdown <= 2 { + if self.countdown_out(2) { break 'run QuietExit::Yield; } self.gil_countdown -= 1; @@ -7951,7 +8023,7 @@ impl Interpreter { .code .names .get(arg as usize) - .map_or("?", String::as_str), + .map_or("?", |n| n.as_str()), recv, ); } @@ -7972,7 +8044,7 @@ impl Interpreter { } *last = cur_pc; // The outer loop's per-instruction prologue, in its order. - if self.gil_countdown <= 2 { + if self.countdown_out(2) { break 'run QuietExit::Yield; } self.gil_countdown -= 1; @@ -8128,7 +8200,7 @@ impl Interpreter { /// Park a finished inline slot (its callable already taken): release /// what the activation owned and return the slot to the pool. fn inline_park(&mut self, mut act: Box) { - debug_assert!(!act.parked && act.delegates.is_empty()); + debug_assert!(!act.parked && act.chain.is_none()); let fr: &mut Frame = &mut act.frame; // Leftover operands drop before anything is reused (their drop // glue is arbitrary Rust code). @@ -8136,21 +8208,8 @@ impl Interpreter { if Rc::strong_count(&fr.locals) == 1 { // SAFETY: sole owner — no other path reaches this vector. let v = unsafe { &mut *fr.locals.as_ptr() }; - if v.iter().all(|o| { - matches!( - o, - Object::Int(_) - | Object::Float(_) - | Object::Bool(_) - | Object::None - | Object::Unbound - ) - }) { - // SAFETY: scalars own nothing; no drop glue is skipped. - unsafe { v.set_len(0) }; - } else { - v.clear(); - } + // SAFETY: sole owner (checked above). + unsafe { release_locals(v) }; } else { // The storage escaped (a materialized frame shares it): the // slot takes fresh storage. @@ -8164,7 +8223,6 @@ impl Interpreter { // activation never left the quiet loop's leaf paths). if !act.clean { if let Some(exc) = fr.exc.as_mut() { - exc.handlers.clear(); exc.saved.clear(); exc.cleanup_lasti = None; exc.pending_lasti = None; @@ -8211,7 +8269,7 @@ impl Interpreter { /// only the code handle and the slot's own fields remain. #[inline(always)] fn inline_park_clean(&mut self, mut act: Box) { - debug_assert!(act.clean && act.frame.stack.is_empty() && act.delegates.is_empty()); + debug_assert!(act.clean && act.frame.stack.is_empty() && act.chain.is_none()); // SAFETY: as `inline_park`: the code handle is owned while active. unsafe { drop(std::ptr::read(&raw const act.frame.code)) }; if act.owns_cells { @@ -8231,6 +8289,60 @@ impl Interpreter { } } + /// [`Self::inline_park_clean`] for a direct call's activation (see + /// `frame_jit::direct_call`) after its clean return: it never owns + /// cells, and of the fields the park resets only `direct` was set + /// (its guard is gone already). + #[inline(always)] + pub(crate) fn inline_park_direct(&mut self, mut act: Box) { + debug_assert!( + act.frame.stack.is_empty() + && !act.owns_cells + && act.binop.is_none() + && !act.discard + && act.guard.is_none() + && act.init_inst.is_none() + && act.act.shell.is_none() + ); + // SAFETY: as `inline_park`: the code handle is owned while active; + // a function holds the code too, so this is rarely its last owner. + unsafe { + let code = std::ptr::read(&raw const act.frame.code); + if crate::rc::try_release_shared(Rc::as_ptr(&code)) { + std::mem::forget(code); + } else { + drop(code); + } + } + act.parked = true; + act.direct = false; + act.caller_pending = None; + if self.inline_pool.len() < INLINE_POOL_CAP { + push_fast(&mut self.inline_pool, act); + } + } + + /// [`Self::inline_park_direct`] for a slot that stays with its direct + /// call's site (`frame_jit::DirectSite`) instead of the pool: parked, + /// but still holding its code's count, so the site's next call of the + /// same code binds it without one. + #[inline(always)] + pub(crate) fn inline_park_warm(&mut self, mut act: Box) -> Box { + debug_assert!( + act.frame.stack.is_empty() + && !act.owns_cells + && act.binop.is_none() + && !act.discard + && act.guard.is_none() + && act.init_inst.is_none() + && act.act.shell.is_none() + ); + act.parked = true; + act.direct = false; + act.caller_pending = None; + act + } + /// `FOR_ITER` over a suspended generator at `pc` of `frame`, as an /// inline activation: the generator's boxed frame runs in place (the /// `generator_send_lean` shape, without a nested native activation). @@ -8251,6 +8363,7 @@ impl Interpreter { ) -> Option> { let arg = match mode { InlineResume::NextCall | InlineResume::SendCall => GEN_NEXT_CALL, + InlineResume::NextDefault => GEN_NEXT_DEFAULT, InlineResume::ForIter => frame.code.instructions.get(pc)?.arg, InlineResume::Send => { let jump = frame.code.instructions.get(pc)?.arg; @@ -8278,6 +8391,14 @@ impl Interpreter { _ => return None, } } + // The method form `gen.send` loads (see `core_gen_method`). + ( + Some(Object::Builtin(b)), + Some(Object::Generator(g) | Object::Coroutine(g)), + Some(v), + ) if matches!(b.name, ".u.gen_send" | ".u.cor_send") => { + (g, matches!(v, Object::None)) + } _ => return None, } } else if send { @@ -8287,6 +8408,12 @@ impl Interpreter { } _ => return None, } + } else if mode == InlineResume::NextDefault { + // `[next, NULL, gen, default]`. + let Some(Object::Generator(g)) = frame.stack.get(n.checked_sub(2)?) else { + return None; + }; + (g, true) } else { let Some(Object::Generator(g)) = frame.stack.last() else { return None; @@ -8297,7 +8424,7 @@ impl Interpreter { // runs while it is held; it ends before the activation resumes. // SAFETY: nothing below reaches the cell again until `state`'s last // use (`peek_mut` rejects a live guard or shared cells). - let state = unsafe { g.state.peek_mut() }?; + let state = unsafe { g.state().peek_mut() }?; let first_resume; { let boxed = match &*state { @@ -8335,11 +8462,41 @@ impl Interpreter { // Committed. let prev_state = std::mem::replace(state, GeneratorState::Running); let g = g.clone(); - let (GeneratorState::Suspended(mut boxed) | GeneratorState::Created(mut boxed)) = - prev_state - else { + let (GeneratorState::Suspended(boxed) | GeneratorState::Created(boxed)) = prev_state else { unreachable!("checked above"); }; + let sent = if send { + frame.stack.pop().unwrap_or(Object::None) + } else { + Object::None + }; + Some(self.inline_gen_commit( + frame, + shell, + pc, + mode, + arg, + (g, boxed, first_resume, sent), + guard, + )) + } + + /// [`Self::try_inline_gen`]'s commit, once the generator `g` (its + /// frame `boxed`, running from here) passed its checks: the sent value + /// goes in (unless a fast step already consumed one), the consumer's + /// operands leave by `mode`, and the activation is built. + #[allow(clippy::too_many_arguments)] + #[inline(always)] + fn inline_gen_commit( + &mut self, + frame: &mut Frame, + shell: &mut QuietShell<'_>, + pc: usize, + mode: InlineResume, + arg: u32, + (g, mut boxed, first_resume, sent): (Rc, Box, bool, Object), + guard: crate::recursion::Guard, + ) -> Box { let gf: &mut Frame = &mut boxed; // A native activation parked at the yield is rebuilt into the // interpreted suspension resumed here. @@ -8347,11 +8504,6 @@ impl Interpreter { crate::tier2::materialize_parked(gf); gf.gen_first_resume = first_resume; // (A fast step that stopped partway already consumed it.) - let sent = if send { - frame.stack.pop().unwrap_or(Object::None) - } else { - Object::None - }; if !std::mem::take(&mut gf.sent_consumed) { gf.push(sent); } @@ -8360,13 +8512,22 @@ impl Interpreter { match mode { // `next`, its empty self slot and the generator (held above). InlineResume::NextCall => { - let n = frame.stack.len(); - drop(frame.stack.drain(n - 3..)); - } - // The bound `send` and its empty self slot (the value went in). + let (a, b, c) = (frame.stack.pop(), frame.stack.pop(), frame.stack.pop()); + drop((a, b, c)); + } + // Likewise, the default staying on top (see + // [`GEN_NEXT_DEFAULT`]). + InlineResume::NextDefault => { + let default = frame.stack.pop().expect("checked above"); + let (a, b, c) = (frame.stack.pop(), frame.stack.pop(), frame.stack.pop()); + frame.stack.push(default); + drop((a, b, c)); + } + // The bound `send` and its empty self slot, or the method and + // the generator (the value went in). InlineResume::SendCall => { - let n = frame.stack.len(); - drop(frame.stack.drain(n - 2..)); + let (a, b) = (frame.stack.pop(), frame.stack.pop()); + drop((a, b)); } _ => {} } @@ -8391,7 +8552,7 @@ impl Interpreter { act.call_pc = pc; act.caller_pending = self.lean_pending_enter(frame, shell, pc); act.exc_depth = self.exc_info_len(); - Some(act) + act } /// Finish an inline generator resume that left the quiet loop with @@ -8455,20 +8616,20 @@ impl Interpreter { Ok(GenStep::Yielded(v)) } Ok(FrameOutcome::Returned(v)) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + Self::finish_running_gen(&gen); let frame: &mut Frame = &mut boxed; self.recycle_frame_allocs(frame); Self::release_finished_gen(&gen); Ok(GenStep::Exhausted(v)) } Ok(FrameOutcome::StartGenerator) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; Err(RuntimeError::Internal( "RETURN_GENERATOR in already-running generator".to_owned(), )) } Err(err) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; let escaped = self.pep479_escape(&gen, err); let frame: &mut Frame = &mut boxed; self.recycle_frame_allocs(frame); @@ -8501,6 +8662,10 @@ impl Interpreter { } match result { Ok(GenStep::Yielded(v)) => { + // `next(gen, default)`: the value takes the default's place. + if arg == GEN_NEXT_DEFAULT { + drop(frame.stack.pop()); + } frame.stack.push(v); QuietEntry::Returned { cur_pc: call_pc } } @@ -8509,6 +8674,11 @@ impl Interpreter { err: crate::error::stop_iteration_with(v), cur_pc: call_pc, }, + // `next(gen, default)`: the default is the result. + Ok(GenStep::Exhausted(v)) if arg == GEN_NEXT_DEFAULT => { + drop(v); + QuietEntry::Returned { cur_pc: call_pc } + } // `SEND`: the return value is the `yield from`/`await` result; // the sub-generator stays for `END_SEND`. Ok(GenStep::Exhausted(v)) if arg & GEN_SEND != 0 => { @@ -8561,29 +8731,23 @@ impl Interpreter { && Rc::strong_count(&frame.locals) == 1 { // SAFETY: sole owner; nothing else reaches the vector. - unsafe { (*frame.locals.as_ptr()).clear() }; + unsafe { release_locals(&mut *frame.locals.as_ptr()) }; drop(done.guard.take()); return Ok(v); } Ok(FrameOutcome::Returned(v)) } - // A shell, but nothing the full epilogue would act on. + // A shell, and no observer for the general loop's return + // events: its epilogue, without entering it (see + // `Self::finish_quiet_return`). ( QuietExit::Outcome { stepped: Ok(StepOutcome::Return(v)), .. }, Some(shell), - ) if !shell - .has_materialized - .load(std::sync::atomic::Ordering::Relaxed) - && self.exc_info_len() <= exc_depth => - { - self.pop_frame_shell(); - // A lazy traceback entry still holding the shell had its - // frame object built by the pop. - Self::settle_exited_frame_object(&shell, frame, true); - self.recycle_frame_shell(shell); + ) if self.return_settles_quietly(&shell, exc_depth) => { + self.finish_quiet_return(frame, shell, exc_depth); Ok(FrameOutcome::Returned(v)) } // An exception leaving an unobserved activation with no handler @@ -9292,8 +9456,8 @@ impl Interpreter { let npos = code.arg_count as usize; let total = npos + code.kwonly_count as usize; if specialize::rc_id(f) != func_id - || total > 16 - || (code.has_varkeywords && (total > 15 || code.varnames.len() <= total)) + || total > 15 + || (code.has_varkeywords && code.varnames.len() <= total) || eff_argc > npos || code.is_generator || code.is_coroutine @@ -9797,7 +9961,7 @@ impl Interpreter { let Some(Object::Instance(inst)) = frame.stack.last() else { return None; }; - let slot = code_vm_ext(&frame.code)?.method_slots.get()?.get(pc)?; + let slot = code_vm_ext(&frame.code)?.method_slot(pc)?; slot.getter(inst.cls_raw().attr_version.get()) } @@ -10106,6 +10270,75 @@ impl Interpreter { Some(self.inline_bind(frame, shell, pc, act, code, Object::Function(f), guard)) } + /// `container[key] = value` (the `STORE_SUBSCR` at `pc` of `frame`) + /// for an instance whose class's `__setitem__` is a plain Python + /// function of `(self, key, value)`, as an inline activation of it + /// (CPython calls it from `STORE_SUBSCR` alike): the three operands + /// leave the stack as its arguments, and its result is discarded. + fn try_inline_setitem( + &mut self, + frame: &mut Frame, + shell: &mut QuietShell<'_>, + pc: usize, + ) -> Option> { + // Stack (top-down): key, container, value. + let n = frame.stack.len(); + if n < 3 { + return None; + } + let Object::Instance(inst) = &frame.stack[n - 2] else { + return None; + }; + // The site remembers the function by the class's attribute version. + let cls = inst.cls_raw(); + let ver = cls.attr_version.get(); + let slot = code_method_slot(&frame.code, pc as u32); + let f = match slot.and_then(|s| s.get_held(ver)) { + Some(f) => f, + None => { + let Some(Object::Function(f)) = cls.lookup("__setitem__") else { + return None; + }; + if let Some(s) = slot { + s.set(ver, &f); + } + f + } + }; + let code = f.code(); + if code.arg_count != 3 + || code.kwonly_count != 0 + || code.has_varargs + || code.has_varkeywords + || code.is_generator + || code.is_coroutine + || code.is_async_generator + || !Self::lean_code_ok(&code) + { + return None; + } + f.lean_cells_ref(&code)?; + // Past the recursion limit the nested lean path raises. + let crate::recursion::Enter::Ok(guard) = crate::recursion::enter() else { + return None; + }; + // Committed. + let key = frame.stack.pop()?; + let container = frame.stack.pop()?; + let value = frame.stack.pop()?; + let act = self.inline_slot(); + // SAFETY: a parked slot's locals storage is its own, and empty. + let locals = unsafe { &mut *act.frame.locals.as_ptr() }; + locals.push(container); + locals.push(key); + locals.push(value); + fill_unbound(locals, code.varnames.len()); + frame.pc = pc as u32 + 1; + let mut act = self.inline_bind(frame, shell, pc, act, code, Object::Function(f), guard); + act.discard = true; + Some(act) + } + /// `FOR_ITER` over a generator, from the quiet loop: the generator /// resumes as a lean activation (see `generator_send_lean`); its /// value is pushed, or on exhaustion the loop exits exactly as the @@ -10248,7 +10481,7 @@ impl Interpreter { } if Rc::strong_count(&locals) == 1 { // SAFETY: sole owner — no other path reaches this vector. - unsafe { (*locals.as_ptr()).clear() }; + unsafe { release_locals(&mut *locals.as_ptr()) }; let mut pool = self.frame_locals_pool.borrow_mut(); if pool.len() < POOL_CAP { pool.push(locals); @@ -10517,6 +10750,80 @@ impl Interpreter { self.run_frame(frame) } + /// Make the activation `depth` levels up the whole stack (the spine, + /// then the pending lean activations, which are always newer than + /// every shell on it) the spine's, pushing the shells of the pending + /// ones up to it and leaving the newer ones pending. Returns its depth + /// from the spine's top. + pub(crate) fn flush_pending_through(&mut self, depth: usize) -> usize { + let n = self.lean_pending.len(); + if depth >= n { + return depth - n; + } + let mut pending = std::mem::take(&mut self.lean_pending); + for addr in &pending[..n - depth] { + // SAFETY: see `flush_lean_cold`. + let caller = unsafe { &mut *(*addr as *mut LeanAct) }; + if caller.shell.is_none() { + caller.shell = Some(self.push_pending_caller_shell(caller)); + } + } + pending.drain(..n - depth); + self.lean_pending = pending; + 0 + } + + /// How many activations the whole stack holds (see + /// [`Self::flush_pending_through`]). + pub(crate) fn stack_depth(&self) -> usize { + self.lean_pending.len() + self.frame_stack.borrow().len() + } + + /// The code, current line and globals of the activation `depth` levels + /// up the whole stack (see [`Self::flush_pending_through`]), without + /// pushing any shell. A pending activation is suspended in a call, its + /// `pc` past it. + pub(crate) fn frame_context_at( + &self, + depth: usize, + ) -> Option<(Rc, u32, Rc>)> { + let n = self.lean_pending.len(); + if depth < n { + // SAFETY: as in `frame_globals_at`. + let frame = unsafe { + let act = &*(self.lean_pending[n - 1 - depth] as *const LeanAct); + &*act.frame + }; + let lasti = frame.pc.saturating_sub(1) as usize; + let line = frame.code.linetable.get(lasti).copied().unwrap_or(0); + return Some((frame.code.clone(), line, frame.globals.clone())); + } + let stack = self.frame_stack.borrow(); + let shell = stack.get(stack.len().checked_sub(1 + depth - n)?)?; + Some(( + (*shell.code).clone(), + shell.current_lineno(), + (*shell.globals).clone(), + )) + } + + /// The globals of the activation `depth` levels up the whole stack + /// (see [`Self::flush_pending_through`]), without pushing any shell. + pub(crate) fn frame_globals_at(&self, depth: usize) -> Option>> { + let n = self.lean_pending.len(); + if depth < n { + // SAFETY: a pending address names a live `LeanAct` whose + // frame pointer its `lean_pending_enter` re-derived (see + // `flush_lean_cold`). + let act = unsafe { &*(self.lean_pending[n - 1 - depth] as *const LeanAct) }; + // SAFETY: as above. + return Some(unsafe { (*act.frame).globals.clone() }); + } + let stack = self.frame_stack.borrow(); + let idx = stack.len().checked_sub(1 + depth - n)?; + Some((*stack[idx].globals).clone()) + } + /// Push the shells of every pending lean *caller* (see /// [`Self::flush_lean_cold`], which also pushes the running one's). pub(crate) fn flush_pending_callers(&mut self) { @@ -10566,23 +10873,16 @@ impl Interpreter { }, None, ) => FrameOutcome::Returned(v), - // A shell, but nothing the full epilogue would act on. + // A shell, and no observer for the general loop's return + // events: its epilogue, without entering it. ( QuietExit::Outcome { stepped: Ok(StepOutcome::Return(v)), .. }, Some(shell), - ) if !shell - .has_materialized - .load(std::sync::atomic::Ordering::Relaxed) - && self.exc_info_len() <= exc_depth_on_entry => - { - self.pop_frame_shell(); - // A lazy traceback entry still holding the shell had its - // frame object built by the pop. - Self::settle_exited_frame_object(&shell, frame, true); - self.recycle_frame_shell(shell); + ) if self.return_settles_quietly(&shell, exc_depth_on_entry) => { + self.finish_quiet_return(frame, shell, exc_depth_on_entry); FrameOutcome::Returned(v) } // Everything else finishes in the general loop, which takes @@ -10660,9 +10960,21 @@ impl Interpreter { #[inline(never)] fn leaf_burst(&mut self, sw: &mut CoreSwitch, snap_gen: u64) -> LeafStop { // Which copy of the core loop runs: the native one drives the - // running code's native form (see `frame_jit`). + // running code's native form (see `frame_jit`). A burst starts in + // the copy its activation's code wants (the other would only switch + // over). #[cfg(feature = "jit")] - let mut native = false; + let mut native = { + // SAFETY: see `CoreSwitch` (the running activation's handles; + // nothing else borrows them here). + let frame = unsafe { &*sw.cur }; + code_vm_ext(&frame.code).is_some_and(|e| { + // SAFETY: as in `leaf_core` (a GIL-serialized read of the + // locals vector's length). + let nlocals = unsafe { (*frame.locals.as_ptr()).len() }; + e.frame_jit.get(nlocals).is_some() + }) + }; loop { #[cfg(feature = "jit")] let exit = if native { @@ -10674,117 +10986,198 @@ impl Interpreter { let exit = self.leaf_core::(sw, snap_gen); match exit { #[cfg(feature = "jit")] - CoreExit::Switch => { - native = !native; - continue; - } + CoreExit::Switch => native = !native, CoreExit::Stop(stop) => return stop, - CoreExit::Helper => { - // SAFETY: see `CoreSwitch` (the running activation's - // handles; nothing else borrows them here). - let frame = unsafe { &mut *sw.cur }; - if burst_stats::enabled() { - if let Some(ins) = frame.code.instructions.get(frame.pc as usize) { - burst_stats::note_helper(ins.op); - let recv = frame.stack.last().map_or("-", |v| v.type_name()); - burst_stats::note_site(&frame.code.qualname, frame.pc, ins.op, recv); - } - } - // A cached property site skips the helper's resolution: a - // pure leaf getter is evaluated in place, any other runs - // as an inline activation. - let pc = frame.pc as usize; - if frame - .code - .instructions - .get(pc) - .is_some_and(|i| i.op == OpCode::LoadAttr) - { - if let Some((getter, code)) = Self::cached_property_getter(frame, pc) { - // SAFETY: as above. - let last_pc = unsafe { &mut *sw.last }; - if self.core_leaf_property(frame, last_pc, pc, &getter, &code) { - // SAFETY: the running thread's own flag. - if unsafe { (*sw.maybe_dead).get() } { - return LeafStop::Marked; - } - continue; - } - if self.core_property(sw) { - continue; - } - } + CoreExit::Slow => { + if let Some(stop) = self.core_offload(sw, snap_gen) { + return stop; } - // SAFETY: as above (`core_property` declined untouched). - let (frame, last_pc) = unsafe { (&mut *sw.cur, &mut *sw.last) }; - match self.leaf_core_helper(frame, last_pc) { - // A released receiver or argument may have queued - // a finalizer (see `after_release!` in the core). + } + CoreExit::Reload => unreachable!("handled inside the core loop"), + } + } + } + + /// [`Self::core_offload_run`] of a [`CoreExit::Slow`] handoff. + #[inline(never)] + fn core_offload(&mut self, sw: &mut CoreSwitch, snap_gen: u64) -> Option { + self.core_offload_run(sw, snap_gen, OFFLOAD_SLOW) + } + + /// Run the instruction the core loop handed over at `sw`'s (synced) + /// running activation's pc, as `mode` says: [`OFFLOAD_HELPER`] out of + /// line (the fused shapes, cache hits and leaf calls of + /// [`Self::leaf_core_helper`] and the lanes), [`OFFLOAD_SLOW`] on a + /// lane or with the full leaf arms, [`OFFLOAD_ARMS`] with the full leaf + /// arms. `None` when the core loop goes on (on the activation `sw` now + /// runs), else how the burst ends. + #[inline(always)] + fn core_offload_run( + &mut self, + sw: &mut CoreSwitch, + snap_gen: u64, + mode: u8, + ) -> Option { + if mode == OFFLOAD_HELPER { + // SAFETY: see `CoreSwitch` (the running activation's handles; + // nothing else borrows them here). + let frame = unsafe { &mut *sw.cur }; + if burst_stats::enabled() { + if let Some(ins) = frame.code.instructions.get(frame.pc as usize) { + burst_stats::note_helper(ins.op); + let recv = frame.stack.last().map_or("-", |v| v.type_name()); + burst_stats::note_site(&frame.code.qualname, frame.pc, ins.op, recv); + } + } + // A cached property site skips the helper's resolution: a + // pure leaf getter is evaluated in place, any other runs as an + // inline activation. + let pc = frame.pc as usize; + if frame + .code + .instructions + .get(pc) + .is_some_and(|i| i.op == OpCode::LoadAttr) + && !failing_attr_site(&frame.code, pc) + { + if let Some((getter, code)) = Self::cached_property_getter(frame, pc) { + // SAFETY: as above. + let last_pc = unsafe { &mut *sw.last }; + if self.core_leaf_property(frame, last_pc, pc, &getter, &code) { // SAFETY: the running thread's own flag. - CoreAttr::Done if unsafe { (*sw.maybe_dead).get() } => { - return LeafStop::Marked; - } - CoreAttr::Done => continue, - CoreAttr::Raised(e) => return LeafStop::Raised(e), - CoreAttr::Full => return LeafStop::Step, - CoreAttr::Decline => { - match frame.code.instructions.get(frame.pc as usize).map(|i| i.op) { - Some(OpCode::LoadAttr) - if self.core_property(sw) || self.core_getitem(sw, true) => - { - continue - } - Some(OpCode::StoreAttr) if self.core_setter(sw) => continue, - Some(OpCode::CallKw | OpCode::CallEx) - if self.core_call_lane(sw) => - { - continue - } - Some(OpCode::Call) - if self.core_leaf_call_lane(sw) || self.core_type_lane(sw) => - { - continue - } - _ => {} - } + if unsafe { (*sw.maybe_dead).get() } { + return Some(LeafStop::Marked); } + return None; + } + if self.core_property(sw) { + return None; } } - CoreExit::Slow => { - // SAFETY: as above. - let frame = unsafe { &*sw.cur }; + } + // SAFETY: as above (`core_property` declined untouched). + let (frame, last_pc) = unsafe { (&mut *sw.cur, &mut *sw.last) }; + match self.leaf_core_helper(frame, last_pc) { + // A released receiver or argument may have queued a + // finalizer (see `after_release!` in the core). + // SAFETY: the running thread's own flag. + CoreAttr::Done if unsafe { (*sw.maybe_dead).get() } => { + return Some(LeafStop::Marked); + } + CoreAttr::Done => return None, + CoreAttr::Raised(e) => return Some(LeafStop::Raised(e)), + CoreAttr::Full => return Some(LeafStop::Step), + CoreAttr::Decline => { match frame.code.instructions.get(frame.pc as usize).map(|i| i.op) { - Some(OpCode::BinarySubscr) if self.core_getitem(sw, false) => continue, - Some(OpCode::ForIter) if self.core_for_iter_lane(sw) => continue, - Some(OpCode::CallKw | OpCode::CallEx) if self.core_call_lane(sw) => { - continue + Some(OpCode::LoadAttr) + if self.core_property(sw) || self.core_getitem(sw, true) => + { + return None } - Some(OpCode::BinaryOp | OpCode::SetUpdate) if self.core_set_op(sw) => { - continue + Some(OpCode::StoreAttr) if self.core_setter(sw) => return None, + Some(OpCode::CallKw | OpCode::CallEx) if self.core_call_lane(sw) => { + return None } - Some(OpCode::BinaryOp | OpCode::CompareOp) - if self.core_operator_lane(sw) => + Some(OpCode::Call) + if self.core_leaf_call_lane(sw) || self.core_type_lane(sw) => { - continue + return None } _ => {} } } - CoreExit::Reload => unreachable!("handled inside the core loop"), } + } else if mode == OFFLOAD_SLOW { // SAFETY: as above. - let (frame, last_pc) = unsafe { (&mut *sw.cur, &mut *sw.last) }; - match self.leaf_burst_slow(frame, snap_gen, last_pc) { - // SAFETY: as above. - LeafStop::Core if unsafe { (*sw.maybe_dead).get() } => return LeafStop::Marked, - LeafStop::Core => {} - stop => return stop, + let frame = unsafe { &*sw.cur }; + match frame.code.instructions.get(frame.pc as usize).map(|i| i.op) { + Some(OpCode::BinarySubscr) if self.core_getitem(sw, false) => return None, + Some(OpCode::StoreSubscr) if self.core_setitem(sw) => return None, + Some(OpCode::ForIter) if self.core_for_iter_lane(sw) => return None, + Some(OpCode::CallKw | OpCode::CallEx) if self.core_call_lane(sw) => return None, + Some(OpCode::BinaryOp | OpCode::SetUpdate) if self.core_set_op(sw) => return None, + Some(OpCode::BinaryOp | OpCode::CompareOp) if self.core_operator_lane(sw) => { + return None + } + _ => {} } } + // SAFETY: as above. + let (frame, last_pc) = unsafe { (&mut *sw.cur, &mut *sw.last) }; + match self.leaf_burst_slow(frame, snap_gen, last_pc) { + // SAFETY: as above. + LeafStop::Core if unsafe { (*sw.maybe_dead).get() } => Some(LeafStop::Marked), + LeafStop::Core => None, + stop => Some(stop), + } + } + + /// [`Self::core_offload_run`] from inside [`Self::leaf_core`]'s loop, which + /// holds the running activation at `at`: synced, then run. `true` when + /// the loop goes on in place, at the new `at`: the same activation, its + /// stack where it was, its site tables as they were, nothing pending: + /// what a reload would derive again is unchanged. Otherwise the loop + /// reloads, which ends the burst first if it must (`sw.pending`). + /// + /// # Safety + /// + /// `at` is the running activation's, as the core loop holds it (every + /// stack slot below `at.len` initialized). + #[inline(never)] + unsafe fn core_offload_in_loop( + &mut self, + sw: &mut CoreSwitch, + snap_gen: u64, + at: &mut CoreAt, + ) -> bool { + let (cur, last) = (sw.cur, sw.last); + // SAFETY: see `CoreSwitch`; the caller's contract. (The core loop + // writes its operand stack in place, so its base and capacity are + // the vector's.) + let (base, cap) = unsafe { + let stack = &mut (*cur).stack; + stack.set_len(at.len); + (*cur).pc = at.pc as u32; + *last = at.last; + (stack.as_mut_ptr(), stack.capacity()) + }; + // The site tables the loop holds views of (empty until allocated). + let tables = |frame: &Frame| { + code_vm_ext(&frame.code) + .map(|e| (e.stamp_slots.is_allocated(), e.method_slots.is_allocated())) + }; + // SAFETY: as above. + let tables_before = tables(unsafe { &*cur }); + if let Some(stop) = self.core_offload_run(sw, snap_gen, MODE) { + // (What the burst's own end would drop with it.) + sw.pending = Some(CoreExit::Stop(stop)); + return false; + } + if sw.pending.is_some() || sw.cur != cur || sw.last != last { + return false; + } + // SAFETY: the same activation, unborrowed here. + let frame = unsafe { &mut *cur }; + let pc = frame.pc as usize; + // (A reload would also count an entry at pc 0 as a call, check the + // pc against the code, and view a site table the run allocated.) + if frame.stack.as_mut_ptr() != base + || frame.stack.capacity() != cap + || pc == 0 + || pc >= frame.code.instructions.len() + || tables(frame) != tables_before + { + return false; + } + at.len = frame.stack.len(); + at.pc = pc; + // SAFETY: the activation's last-pc slot. + at.last = unsafe { *last }; + true } /// Run the core loop's out-of-line instruction at `frame.pc` (the - /// ones [`Self::leaf_core`] hands over as [`CoreExit::Helper`]): the + /// ones [`Self::leaf_core`] hands over to [`Self::core_offload`]): the /// fused `len(x)` and `x.attr` shapes, the global/attribute cache hits, /// and leaf builtin/type calls. Advances `frame.pc` past what ran; /// `Decline` touches nothing. @@ -10849,7 +11242,13 @@ impl Interpreter { } else { "__iter__" }; - let Some(gen) = self.instance_gen_call(v, name) else { + // (`await fut` of a native asyncio future: its `FutureIter`.) + let made = if ins.op == OpCode::GetAwaitable { + crate::stdlib::asyncio_mod::native_future_await(v) + } else { + None + }; + let Some(gen) = made.or_else(|| self.instance_gen_call(v, name)) else { return CoreAttr::Decline; }; let top = frame.stack.last_mut().expect("checked above"); @@ -10921,6 +11320,75 @@ impl Interpreter { CoreAttr::Done } + /// [`Self::leaf_load_special`] over the `len` stack slots at `base` + /// (room to `cap`), for compiled code: `LOAD_SPECIAL` (`ins`, at `pc` + /// of `code`) of an instance whose class resolves the method to a + /// plain function or a native class's method, from the site's slot or + /// filling it. Returns the new stack length, or `None`, having touched + /// nothing. + /// + /// # Safety + /// + /// The `len` slots at `base` are initialized operand stack entries. + pub(crate) unsafe fn core_load_special( + code: &CodeObject, + ins: weavepy_compiler::Instruction, + pc: usize, + base: *mut Object, + len: usize, + cap: usize, + ) -> Option { + use weavepy_compiler::bytecode::{SPECIAL_ENTER, SPECIAL_EXIT}; + if len == 0 || len >= cap { + return None; + } + // SAFETY: `len > 0`. + let top = unsafe { base.add(len - 1) }; + let Object::Instance(inst) = (unsafe { &*top }) else { + return None; + }; + let cls = inst.cls_raw(); + let ver = cls.attr_version.get(); + let ms = code_method_slot(code, pc as u32); + let held = ms.and_then(|ms| { + ms.get_held(ver) + .map(Object::Function) + .or_else(|| ms.get_inst_builtin(ver).map(Object::Builtin)) + }); + let method = match held { + Some(m) => m, + None => { + let name = match ins.arg { + SPECIAL_ENTER => "__enter__", + SPECIAL_EXIT => "__exit__", + _ => return None, + }; + match cls.lookup(name) { + Some(Object::Function(f)) => { + if let Some(ms) = ms { + ms.set(ver, &f); + } + Object::Function(f) + } + Some(Object::Builtin(b)) if b.binds_instance && native_call_ic_safe(b.name) => { + if let Some(ms) = ms { + ms.set_inst_builtin(ver, &b); + } + Object::Builtin(b) + } + _ => return None, + } + } + }; + // SAFETY: `len < cap`; the instance moves up into the self slot. + unsafe { + let recv = top.read(); + top.write(method); + base.add(len).write(recv); + } + Some(len + 1) + } + /// The core loop's `LOAD_FAST x` (at `pc`, of the heap local `other`) /// followed by `x.m()`: a native method the site /// cached for the receiver's class, a leaf method the site verified, @@ -10929,13 +11397,20 @@ impl Interpreter { /// `CALL`'s pc; `None` touches nothing (the instructions run one by /// one). /// + /// `CALLING_EFFECTS` runs a recursive effect leaf (one that stores and + /// may call itself, see [`code_recurses`]) in place too. Compiled + /// callers pass `false`: for them the method load and direct call cost + /// less than the leaf evaluator nesting its own evaluation. The core + /// loop passes `true`, since its alternative is a full activation, + /// which costs more. + /// /// # Safety /// /// `lbase` is the running activation's `nlocals` locals; nothing else /// borrows them. #[inline(always)] #[allow(clippy::too_many_arguments)] - unsafe fn core_local_method( + unsafe fn core_local_method( &self, code: &CodeObject, ext: Option<&CodeConstObjects>, @@ -10947,16 +11422,20 @@ impl Interpreter { depth_cell: *const std::cell::Cell, ) -> Option<(Result, usize)> { let next = *code.instructions.get(pc + 1)?; - let mslots: &[MethodSlot] = ext - .and_then(|e| e.method_slots.get()) - .map_or(&[][..], |s| &s[..]); + let mslots: Sites<'_, MethodSlot> = ext.map_or(Sites::empty(), |e| e.method_sites()); match other { Object::Instance(_) | Object::Module(_) => { // A site that verified its callee for this class version - // (its call checks the argument shape itself). + // (its call checks the argument shape itself); a recursive + // effect leaf only when `CALLING_EFFECTS` (see above). let mut missed = false; if let (Object::Instance(i), Some(ext)) = (other, ext) { - if let Some(site) = leaf_site_hit(ext, pc + 1, i.cls_raw().attr_version.get()) { + if let Some(site) = leaf_site_hit(ext, pc + 1, i.cls_raw().attr_version.get()) + // SAFETY: the site's code is its live function's. + .filter(|&(_, c, effect)| { + CALLING_EFFECTS || !effect || !code_recurses(unsafe { &*c }) + }) + { match self.core_leaf_site_call( code, i, @@ -11008,7 +11487,13 @@ impl Interpreter { .peek_fn(i.cls_raw().attr_version.get()) // SAFETY: the slot's function is alive (its class // version matched). - .is_some_and(|fp| fn_is_leaf(unsafe { &*fp })), + .is_some_and(|fp| { + let f = unsafe { &*fp }; + fn_is_pure_leaf(f) + || (fn_is_leaf(f) + && (CALLING_EFFECTS + || !code_recurses(unsafe { &*f.code.as_ptr() }))) + }), _ => false, }; if pure_site { @@ -11059,7 +11544,7 @@ impl Interpreter { || call.op != OpCode::Call || call.arg != 1 || frame.builtins_obj().is_some() - || frame.code.names.get(name_idx as usize).map(String::as_str) != Some("len") + || frame.code.names.get(name_idx as usize).map(|n| n.as_str()) != Some("len") { return None; } @@ -11100,20 +11585,16 @@ impl Interpreter { ($cache:ident, $frame:expr, $ext:expr) => { *$cache.get_or_insert_with(|| { if $frame.builtins_obj().is_none() { - $ext.and_then(|e| e.stamp_slots.get()) - .map_or(&[][..], |s| &s[..]) + $ext.map_or(Sites::empty(), |e| e.stamp_sites()) } else { - &[][..] + Sites::empty() } }) }; } macro_rules! mslots { ($cache:ident, $ext:expr) => { - *$cache.get_or_insert_with(|| { - $ext.and_then(|e| e.method_slots.get()) - .map_or(&[][..], |s| &s[..]) - }) + *$cache.get_or_insert_with(|| $ext.map_or(Sites::empty(), |e| e.method_sites())) }; } 'reload: loop { @@ -11137,14 +11618,26 @@ impl Interpreter { // during an activation, and nothing here runs Python code). let locals: &mut Vec = unsafe { &mut *frame.locals.as_ptr() }; let (lbase, nlocals) = (locals.as_mut_ptr(), locals.len()); + // The code's native form (see `frame_jit`): the native copy of + // this loop runs it from every pc the arms below leave it at, + // and the arms only run the instructions it returns at. (Tested + // before the rest of the prologue, which the other copy derives + // again.) + #[cfg(feature = "jit")] + let native = ext.and_then(|e| e.frame_jit.get(nlocals)); + #[cfg(feature = "jit")] + if NATIVE != native.is_some() { + // (The activation is synced at every reload.) + return CoreExit::Switch; + } // (The namespaces are read off the frame at their uses: holding // them here costs every switch a spill.) // The arms' colder per-activation state (the global and class // attribute stamps, the method slots) is derived at its first // use: every call, return and helper handoff runs this prologue // again, and most activations never read it. - let mut cold_stamps: Option<&[StampSlot]> = None; - let mut cold_mslots: Option<&[MethodSlot]> = None; + let mut cold_stamps: Option> = None; + let mut cold_mslots: Option> = None; // // The fused local pairs below, one byte per instruction (empty // for code that has none). @@ -11177,15 +11670,22 @@ impl Interpreter { } }; } - // The code's native form (see `frame_jit`): the native copy of - // this loop runs it from every pc the arms below leave it at, - // and the arms only run the instructions it returns at. - #[cfg(feature = "jit")] - let native = ext.and_then(|e| e.frame_jit.get(nlocals)); - #[cfg(feature = "jit")] - if NATIVE != native.is_some() { - // (The activation is synced at every reload.) - return CoreExit::Switch; + // Hand the instruction at `pc` over (see `core_offload_run`'s + // modes) without leaving the loop: when the activation goes on + // in place, so does the loop, with no reload (see + // `core_offload_in_loop`). + macro_rules! offload { + ($mode:expr) => {{ + let mut at = CoreAt { len, pc, last }; + // SAFETY: the running activation's state, as held here. + if unsafe { self.core_offload_in_loop::<{ $mode }>(sw, snap_gen, &mut at) } { + len = at.len; + pc = at.pc; + last = at.last; + continue; + } + break Some(CoreExit::Reload); + }}; } // The native code writes the stack at fixed offsets: a stack // that started small (a materialized frame's) grows first. @@ -11229,6 +11729,7 @@ impl Interpreter { frame: sw.cur, sw: std::ptr::from_mut(sw), gen_depth: 0, + direct: false, }); nst.len = len; nst.pc = pc; @@ -11273,7 +11774,8 @@ impl Interpreter { // every pc keeps its own unit, so the pair is fused // here instead — one dispatch, and `x = y` never // touches the stack at all. - match fast_pairs.get(pc).copied().unwrap_or(0) { + let kind = fast_pairs.get(pc).copied().unwrap_or(0); + match kind { 1 => { // SAFETY: a pair kind is only recorded where // `pc + 1` names an instruction. @@ -11288,6 +11790,10 @@ impl Interpreter { // The scalar shapes copy inline, as // the single-load arm does. let ca = match a { + s @ (Object::Int(_) + | Object::Float(_) + | Object::Bool(_) + | Object::None) => scalar_copy(s), Object::Unbound => break None, other => clone_hot(other), }; @@ -11346,7 +11852,7 @@ impl Interpreter { // pair kind is only recorded where the branch // instruction exists. let v = unsafe { &*lbase.add(i) }; - let jump_pc = pc + 1 + usize::from(fast_pairs[pc] == 4); + let jump_pc = pc + 1 + usize::from(kind == 4); let jump = unsafe { *instrs.add(jump_pc) }; let taken = match (jump.op, v) { (_, Object::Unbound) => None, @@ -11396,111 +11902,104 @@ impl Interpreter { | Object::Bool(_) | Object::None) => scalar_copy(s), Object::Unbound => break None, - other => { - // `x.attr` on a local receiver: read straight - // off the local (no receiver clone pushed and - // released); a miss loads the receiver and - // leaves `LOAD_ATTR` to its own arm. - // `x.m(...)` of a leaf or native method on the - // borrowed local (see `core_local_method`). - if pc + 1 < ninstrs - && len < cap - && (*instrs.add(pc + 1)).op == OpCode::LoadMethodAttr - { - if let Some((r, call_pc)) = self.core_local_method( - code, - ext, - other, - pc, - lbase, - nlocals, - consts, - sw.depth_cell, - ) { - last = call_pc; - pc = call_pc + 1; - match r { - Ok(v) => { - base.add(len).write(v); - len += 1; - continue; - } - Err(e) => { - break Some(CoreExit::Stop(LeafStop::Raised( - e, - ))); - } + // A plain load (kind 0) of a heap value is a + // clone; the kinds past the pairs fuse the + // instruction after it (see `code_fast_pairs`). + other if kind < FAST_METHOD => clone_hot(other), + // `x.m(...)` of a leaf or native method on the + // borrowed local (see `core_local_method`). + other if kind == FAST_METHOD => { + if let Some((r, call_pc)) = self.core_local_method::( + code, + ext, + other, + pc, + lbase, + nlocals, + consts, + sw.depth_cell, + ) { + last = call_pc; + pc = call_pc + 1; + match r { + Ok(v) => { + base.add(len).write(v); + len += 1; + continue; + } + Err(e) => { + break Some(CoreExit::Stop(LeafStop::Raised(e))); } } } - if matches!(other, Object::Instance(_) | Object::Module(_)) - && pc + 1 < ninstrs - { - let next = *instrs.add(pc + 1); - if next.op == OpCode::LoadAttr { - if code - .instructions - .get(pc + 2) - .is_some_and(|ins| ins.op == OpCode::LoadAttr) - { - if let Some((v, end)) = - Self::core_local_attr_chain(code, other, pc + 1) - { - base.add(len).write(v); - len += 1; - last = end; - pc = end + 1; - continue; - } - } else if let (Some(ext), Object::Instance(inst)) = - (ext, other) - { - // The site's field shortcut, in line (the - // common monomorphic read). - if let Some(v) = field_slot_hit(ext, pc + 1, inst) { - base.add(len).write(clone_hot(v)); - len += 1; - last = pc + 1; - pc += 2; - continue; - } - } - if let Some(v) = Self::core_local_attr( - ext, - code, - other, - pc + 1, - next.arg, - ) { - base.add(len).write(v); + clone_hot(other) + } + // `x.attr` on a local receiver: read straight off + // the local (no receiver clone pushed and + // released); a miss loads the receiver and leaves + // `LOAD_ATTR` to its own arm. + other @ (Object::Instance(_) | Object::Module(_)) => { + // SAFETY: an attribute kind is only recorded + // where `pc + 1` names an instruction. + let next = *instrs.add(pc + 1); + if kind == FAST_ATTR_CHAIN { + if let Some((v, end)) = + Self::core_local_attr_chain(code, other, pc + 1) + { + base.add(len).write(v); + len += 1; + last = end; + pc = end + 1; + continue; + } + } else if kind == FAST_ATTR { + // The site's field shortcut, in line (the + // common monomorphic read). + if let (Some(ext), Object::Instance(inst)) = (ext, other) { + if let Some(v) = field_slot_hit(ext, pc + 1, inst) { + base.add(len).write(clone_hot(v)); len += 1; last = pc + 1; pc += 2; continue; } } - // `x.attr = v` on a local receiver: - // store straight into it, so the - // receiver is never pushed, cloned and - // dropped (a drop the collector grades). - if next.op == OpCode::StoreAttr - && len > 0 - && Self::core_store_local_attr( - code, - other, - pc + 1, - next.arg, - &*base.add(len - 1), - ) - { - len -= 1; + } + if kind != FAST_STORE_ATTR { + if let Some(v) = Self::core_local_attr( + ext, + code, + other, + pc + 1, + next.arg, + ) { + base.add(len).write(v); + len += 1; last = pc + 1; pc += 2; continue; } + } else if len > 0 + // `x.attr = v` on a local receiver: store + // straight into it, so the receiver is + // never pushed, cloned and dropped (a + // drop the collector grades). + && Self::core_store_local_attr( + code, + other, + pc + 1, + next.arg, + &*base.add(len - 1), + ) + { + len -= 1; + last = pc + 1; + pc += 2; + continue; } clone_hot(other) } + other => clone_hot(other), }; base.add(len).write(c); } @@ -11574,12 +12073,48 @@ impl Interpreter { break None; } len -= 1; - self.release(std::mem::replace(&mut *slot, base.add(len).read())); + self.release_hot(std::mem::replace( + &mut *slot, + base.add(len).read(), + )); + last = pc; + pc += 1; + after_release!(); + continue; + } + } + last = pc; + pc += 1; + } + // `del x` of a bound plain local (an `except ... as e:` + // clause's cleanup, after its `e = None`), as the full + // arm runs it: an unbound local raises there, and a slot + // shared with a cell is the full handler's. + OpCode::DeleteFast => { + let i = ins.arg as usize; + if i >= nlocals + || (!code.cellvars.is_empty() + && Self::shared_cell_index(code, i).is_some()) + { + break None; + } + // SAFETY: `i < nlocals`. + unsafe { + let slot = lbase.add(i); + if matches!(*slot, Object::Unbound) { + break None; + } + if !scalar(&*slot) { + if !Self::core_droppable(&*slot) { + break None; + } + self.release_hot(std::mem::replace(&mut *slot, Object::Unbound)); last = pc; pc += 1; after_release!(); continue; } + slot.write(Object::Unbound); } last = pc; pc += 1; @@ -11731,6 +12266,35 @@ impl Interpreter { last = pc; pc += 1; } + // `not x`, `-x` and `~x` of a scalar, replaced in place + // (nothing to release); any other shape is the full + // leaf arm's. + OpCode::UnaryOp => { + if len == 0 { + break None; + } + // SAFETY: `len > 0`. + let top = unsafe { base.add(len - 1) }; + // SAFETY: as in the full handler (the compiler only + // emits valid kinds). + let kind: UnaryKind = unsafe { std::mem::transmute(ins.arg as u8) }; + // SAFETY: as above. + let r = match (unsafe { &*top }, kind) { + (Object::Bool(b), UnaryKind::Not) => bool_hot(!*b), + (Object::Int(i), UnaryKind::Not) => bool_hot(*i == 0), + (Object::None, UnaryKind::Not) => bool_hot(true), + (Object::Int(i), UnaryKind::Neg) => match i.checked_neg() { + Some(r) => int_hot(r), + None => break None, + }, + (Object::Int(i), UnaryKind::Invert) => int_hot(!*i), + _ => break None, + }; + // SAFETY: a scalar operand is overwritten in place. + unsafe { top.write(r) }; + last = pc; + pc += 1; + } OpCode::PopJumpIfNone | OpCode::PopJumpIfNotNone => { if len == 0 { break None; @@ -11766,7 +12330,13 @@ impl Interpreter { // next instruction stores it back): the local lets go of // the string, which then grows in place when nothing else // holds it (CPython's `BINARY_OP_INPLACE_ADD_UNICODE`). - if kind == BinOpKind::Add && pc + 1 < ninstrs { + // (The left operand's tag first: a numeric add skips + // the rest.) + // SAFETY: `len >= 2`. + if kind == BinOpKind::Add + && matches!(unsafe { &*base.add(len - 2) }, Object::Str(_)) + && pc + 1 < ninstrs + { // SAFETY: `pc + 1 < ninstrs`. let next = unsafe { *instrs.add(pc + 1) }; let li = next.arg as usize; @@ -12266,6 +12836,26 @@ impl Interpreter { CompareKind::Gt => ord.is_gt(), CompareKind::GtE => ord.is_ge(), }; + // A branch on the result (`if a < b:`) runs with the + // compare: the bool is never pushed. (A compare can + // fall through, so it never ends the code.) + // SAFETY: `pc + 1 < ninstrs` (see `code_dispatch_len`). + let next = unsafe { *instrs.add(pc + 1) }; + if matches!(next.op, OpCode::PopJumpIfFalse | OpCode::PopJumpIfTrue) { + // SAFETY: both operands are scalars (no drop owed). + len -= 2; + last = pc + 1; + pc += 2; + if r == (next.op == OpCode::PopJumpIfTrue) { + pc += next.arg as usize; + } else if + // SAFETY: a branch never ends the code (see + // `code_dispatch_len`). + unsafe { (*instrs.add(pc)).op } == OpCode::NotTaken { + pc += 1; + } + continue; + } // SAFETY: both operands are scalars (no drop owed); // the result takes the lower one's slot. len -= 1; @@ -12330,7 +12920,7 @@ impl Interpreter { OpCode::JumpBackward => { // The back edge is the burst's eval-breaker (see // `leaf_burst_slow`). - if self.gil_countdown <= 1 || crate::hot_gates::loop_gen() != snap_gen { + if self.countdown_out(1) || crate::hot_gates::loop_gen() != snap_gen { break Some(CoreExit::Stop(LeafStop::Breaker)); } #[cfg(feature = "jit")] @@ -12368,8 +12958,63 @@ impl Interpreter { Object::Generator(_) | Object::Coroutine(_) ) { + // `await fut` of a native asyncio future: its + // iterator's step, the sent value replaced by + // what it yields, or by the result as the + // `SEND` exits (see `future_iter_send`). + // SAFETY: `len >= 2` (checked first). + let step = (len >= 2 && ins.arg & GEN_SEND == 0) + .then(|| unsafe { &*base.add(len - 2) }) + .and_then(crate::stdlib::asyncio_mod::future_iter_send); + if let Some(step) = step { + use crate::stdlib::asyncio_mod::FutureIterStep; + let (v, exit) = match step { + FutureIterStep::Yield(v) => (v, false), + FutureIterStep::Return(v) => (v, true), + }; + // SAFETY: `len >= 2`: the sent value's slot. + unsafe { drop_hot(std::mem::replace(&mut *base.add(len - 1), v)) }; + last = pc; + pc += 1; + if exit { + pc += ins.arg as usize; + } + after_release!(); + continue; + } break Some(CoreExit::Stop(LeafStop::Step)); } + // A simple generator steps to its next yield in + // place, as a `FOR_ITER` over it does (see + // `gen_fast`): what it yields takes the sent `None`'s + // slot, or its return value does as the `SEND` exits. + // SAFETY: `len >= 2` (checked above). + if let (Object::Generator(g), Object::None, 0) = unsafe { + (&*base.add(len - 2), &*base.add(len - 1), ins.arg & GEN_SEND) + } { + let (v, exit) = match gen_fast::may_step(g) + .then(|| self.gen_fast_next(g, snap_gen, 0, pending_work)) + { + None => (None, false), + Some(gen_fast::GenNext::Yielded(v)) => (Some(v), false), + Some(gen_fast::GenNext::Exhausted(v)) => (Some(v), true), + Some(gen_fast::GenNext::Declined | gen_fast::GenNext::Partial) => { + (None, false) + } + }; + if let Some(v) = v { + // SAFETY: the sent `None`'s slot (no drop + // glue owed). + unsafe { base.add(len - 1).write(v) }; + last = pc; + pc += 1; + if exit { + pc += ins.arg as usize; + } + after_release!(); + continue; + } + } // SAFETY: `len <= cap`, every slot initialized. unsafe { frame.stack.set_len(len) }; frame.pc = pc as u32; @@ -13101,25 +13746,44 @@ impl Interpreter { // `CALL`'s does (see `core_call_kw`); a common // builtin function (`sorted(xs, key=f)`) runs in // the builtin lane. - let builtin = match &ops[0] { - Object::Function(_) => false, + // (0: a Python function, 1: a builtin, 2: a + // plain class, constructed in place.) + let kind = match &ops[0] { + Object::Function(_) => 0, Object::Builtin(b) if !b.binds_instance && matches!(&ops[1], Object::Unbound) && builtin_fn_lane_ok(b.name) => { - true + 1 } + Object::Type(t) if !t.flags.is_builtin => 2, _ => break None, }; // SAFETY: `len <= cap`, every slot initialized. unsafe { frame.stack.set_len(len) }; frame.pc = pc as u32; *last_pc = last; - let ran = if builtin { - self.core_builtin_kw_lane(sw, pc) - } else { - self.core_call_kw(sw, pc) || self.core_call_lane(sw) + let ran = match kind { + 1 => self.core_builtin_kw_lane(sw, pc), + // A metaclass's own `__call__` takes the + // call as its method (see `core_new`). + // SAFETY: the running activation, synced. + 2 if Self::unpack_meta_call( + unsafe { &mut *sw.cur }, + argc + kwc + 1, + ) => + { + self.core_call_kw(sw, pc) || self.core_call_lane(sw) + } + 2 => { + let new = self.core_new_kw(sw, pc, snap_gen); + if new { + burst_stats::note_call(burst_stats::CALL_NEW); + } + new || self.core_call_lane(sw) + } + _ => self.core_call_kw(sw, pc) || self.core_call_lane(sw), }; if !ran && sw.pending.is_none() { sw.pending = Some(CoreExit::Stop(LeafStop::Step)); @@ -13129,14 +13793,14 @@ impl Interpreter { // SAFETY: every operand was checked to leave by a plain // decrement; the result takes the callee's slot. unsafe { - for k in start..len { - drop_hot(base.add(k).read()); - } + release_run(base.add(start), len - start); base.add(start).write(r); } len = start + 1; last = pc; pc += 1; + // (An argument the call held last died.) + after_release!(); } OpCode::Call => { let argc = ins.arg as usize; @@ -13197,9 +13861,7 @@ impl Interpreter { // by plain decrements; the result // takes the callee's slot. unsafe { - for k in callee_at..len { - drop_hot(base.add(k).read()); - } + release_run(base.add(callee_at), len - callee_at); base.add(callee_at).write(v); } len = callee_at + 1; @@ -13210,9 +13872,7 @@ impl Interpreter { Some(Err(e)) => { // SAFETY: as above. unsafe { - for k in callee_at..len { - drop_hot(base.add(k).read()); - } + release_run(base.add(callee_at), len - callee_at); } len = callee_at; pc += 1; @@ -13236,12 +13896,12 @@ impl Interpreter { .flatten() { let callee_at = len - argc - 2; + // SAFETY: as above: the callee. + note_type_site(ext, pc, unsafe { &*base.add(callee_at) }); // SAFETY: every operand was checked droppable; // the result takes the callee's slot. unsafe { - for k in callee_at..len { - drop_hot(base.add(k).read()); - } + release_run(base.add(callee_at), len - callee_at); base.add(callee_at).write(v); } len = callee_at + 1; @@ -13273,9 +13933,7 @@ impl Interpreter { // the step) leave by plain decrements; // the value takes the callee's slot. unsafe { - for k in len - 3..len { - drop_hot(base.add(k).read()); - } + release_run(base.add(len - 3), 3); base.add(len - 3).write(v); } len -= 2; @@ -13288,9 +13946,7 @@ impl Interpreter { gen_fast::GenNext::Exhausted(v) => { // SAFETY: as above. unsafe { - for k in len - 3..len { - drop_hot(base.add(k).read()); - } + release_run(base.add(len - 3), 3); } len -= 3; pc += 1; @@ -13314,19 +13970,36 @@ impl Interpreter { // value sent in. // SAFETY: `len >= argc + 2 == 3`. if argc == 1 + && !plain_fn + && Self::gen_send_call(unsafe { &*base.add(len - 3) }, unsafe { + &*base.add(len - 2) + }) + { + // SAFETY: `len <= cap`, every slot initialized. + unsafe { frame.stack.set_len(len) }; + frame.pc = pc as u32; + *last_pc = last; + if !self.core_gen_resume(sw, pc, InlineResume::SendCall) { + sw.pending = Some(CoreExit::Stop(LeafStop::Step)); + } + break Some(CoreExit::Reload); + } + // `next(gen, default)`: as `next(gen)`, with the + // default the result of an exhausted generator. + // SAFETY: `len >= argc + 2 == 4`. + if argc == 2 && !plain_fn && matches!( - unsafe { (&*base.add(len - 3), &*base.add(len - 2)) }, - (Object::BoundMethod(bm), Object::Unbound) - if matches!(&bm.function, Object::Builtin(b) - if matches!(b.name, ".gen_send" | ".cor_send")) + unsafe { (&*base.add(len - 4), &*base.add(len - 3), &*base.add(len - 2)) }, + (Object::Builtin(b), Object::Unbound, Object::Generator(_)) + if Rc::as_ptr(b) as usize == self.leaf_fns().next_ptr ) { // SAFETY: `len <= cap`, every slot initialized. unsafe { frame.stack.set_len(len) }; frame.pc = pc as u32; *last_pc = last; - if !self.core_gen_resume(sw, pc, InlineResume::SendCall) { + if !self.core_gen_resume(sw, pc, InlineResume::NextDefault) { sw.pending = Some(CoreExit::Stop(LeafStop::Step)); } break Some(CoreExit::Reload); @@ -13357,14 +14030,14 @@ impl Interpreter { // by a plain decrement; the result takes the // callee's slot. unsafe { - for k in start..len { - drop_hot(base.add(k).read()); - } + release_run(base.add(start), len - start); base.add(start).write(r); } len = start + 1; last = pc; pc += 1; + // (An argument the call held last died.) + after_release!(); continue; } } @@ -13387,14 +14060,13 @@ impl Interpreter { // plain decrement; the result takes the callee's // slot. unsafe { - for k in start..len { - drop_hot(base.add(k).read()); - } + release_run(base.add(start), len - start); base.add(start).write(r); } len = start + 1; last = pc; pc += 1; + after_release!(); continue; } } @@ -13404,7 +14076,27 @@ impl Interpreter { frame.pc = pc as u32; *last_pc = last; let switched = if python == 1 { - self.core_call(sw, pc) || self.core_gen_call(sw, pc) + if self.core_call(sw, pc) { + true + } else if self.core_gen_call(sw, pc) { + // The generator, made in place: no switch, + // so the loop goes on (unless a release + // queued a finalizer, or an `await` + // started the coroutine). + if sw.pending.is_none() + && std::ptr::eq(sw.cur.cast_const(), &raw const *frame) + { + // SAFETY: the running activation (its + // stack only shrank: no reallocation). + len = unsafe { (*sw.cur).stack.len() }; + last = pc; + pc += 1; + continue; + } + true + } else { + false + } } else { let new = self.core_new(sw, pc, snap_gen); if new { @@ -13479,15 +14171,15 @@ impl Interpreter { // SAFETY: `len >= argc + 2`: the self slot. let recv = unsafe { &*base.add(len - argc - 1) }; let Object::List(l) = recv else { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); }; if !Self::core_droppable(recv) { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } // SAFETY: nothing below runs code while the // items are borrowed (see `GilCell::peek_mut`). let Some(items) = (unsafe { l.peek_mut() }) else { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); }; let result = match (kind, argc) { (Some(LeafKind::ListAppend), 1) => { @@ -13500,9 +14192,9 @@ impl Interpreter { Some(v) => v, // `pop from empty list` raises: the // helper's path. - None => break Some(CoreExit::Helper), + None => offload!(OFFLOAD_HELPER), }, - _ => break Some(CoreExit::Helper), + _ => offload!(OFFLOAD_HELPER), }; // SAFETY: the list (droppable) and the builtin // (count above one) leave by plain decrements; @@ -13515,6 +14207,7 @@ impl Interpreter { len -= 1; last = pc; pc += 1; + after_release!(); } // `append(x)` of a local `append = lst.append` on an // exact list (the site's leaf kind, likewise): the @@ -13530,12 +14223,12 @@ impl Interpreter { == Some(LeafKind::ListAppend)) => { let Object::List(l) = &bm.receiver else { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); }; // SAFETY: nothing below runs code while the // items are borrowed (see `GilCell::peek_mut`). let Some(items) = (unsafe { l.peek_mut() }) else { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); }; // SAFETY: the operand moves into the list; the // empty self slot and the bound method (held @@ -13578,8 +14271,8 @@ impl Interpreter { let ops = unsafe { std::slice::from_raw_parts(base.add(first), len - first) }; - if !ops.iter().all(Self::core_droppable) { - break Some(CoreExit::Helper); + if !Self::core_all_droppable(ops) { + offload!(OFFLOAD_HELPER); } let r = match kind { Some(LeafKind::Fast(f)) => f(ops), @@ -13594,30 +14287,27 @@ impl Interpreter { }; match r { // A fast half declined, untouched. - None => break Some(CoreExit::Helper), + None => offload!(OFFLOAD_HELPER), Some(Ok(v)) => { // SAFETY: every operand (checked) and // the builtin (count above one) leave // by plain decrements; the result takes // the callee's slot. unsafe { - for k in callee_at..len { - drop_hot(base.add(k).read()); - } + release_run(base.add(callee_at), len - callee_at); base.add(callee_at).write(v); } len = callee_at + 1; last = pc; pc += 1; + after_release!(); } // As the helper's raise: the operands drop // wholesale and the pc moves past the call. Some(Err(e)) => { // SAFETY: as above. unsafe { - for k in callee_at..len { - drop_hot(base.add(k).read()); - } + release_run(base.add(callee_at), len - callee_at); } len = callee_at; pc += 1; @@ -13641,7 +14331,7 @@ impl Interpreter { if matches!(&bm.function, Object::Builtin(b) if slot.get_leaf(b).is_some()) { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } } break None; @@ -13649,11 +14339,11 @@ impl Interpreter { // A leaf builtin or directly constructible type, or // a bound builtin method held in a local (`append = // y.append`): out of line. - Object::Builtin(_) | Object::Type(_) => break Some(CoreExit::Helper), + Object::Builtin(_) | Object::Type(_) => offload!(OFFLOAD_HELPER), Object::BoundMethod(bm) if matches!(&bm.function, Object::Builtin(_)) => { - break Some(CoreExit::Helper) + offload!(OFFLOAD_HELPER) } _ => break None, } @@ -13663,7 +14353,7 @@ impl Interpreter { OpCode::LoadGlobal => { use weavepy_compiler::InlineCache as IC; let Some(slot) = stamps!(cold_stamps, frame, ext).get(pc) else { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); }; if len == cap { break None; @@ -13674,91 +14364,113 @@ impl Interpreter { let (gdict, bdict) = (frame.globals.as_ptr(), frame.builtins.as_ptr()); let gid = specialize::rc_id(&frame.globals); let g_stamp = unsafe { (*gdict).mutation_stamp() }; - let hit = match code.caches.get(pc as u32) { - IC::LoadGlobalModule { - globals_id, - key_idx, - } if globals_id == gid && slot.get() == [gid, g_stamp, 0] => unsafe { - (*gdict).get_index(key_idx as usize) - }, - IC::LoadGlobalBuiltin { - builtins_id, - key_idx, - } if builtins_id == specialize::rc_id(&frame.builtins) - && !self.globals_missing_any.get() - && slot.get() - == [gid, g_stamp, unsafe { (*bdict).mutation_stamp() }] => - { - let hit = unsafe { (*bdict).get_index(key_idx as usize) }; - // `len(local)`: the length straight off the local. - if let Some((_, Object::Builtin(f))) = hit { - if Rc::as_ptr(f) as usize == self.leaf_fns().len_ptr - && pc + 3 < ninstrs + let stamp = slot.get(); + // The value the site last read, in place while the + // stamp holds (see `StampSlot::value`); else the + // inline cache's entry under the stamp, recorded. + let held = slot.value(); + let (v, builtin): (&Object, bool) = if held != 0 + && stamp[0] == gid + && stamp[1] == g_stamp + && if held & 1 == 0 { + stamp[2] == 0 + } else { + !self.globals_missing_any.get() + && stamp[2] == unsafe { (*bdict).mutation_stamp() } + } { + // SAFETY: the dicts are as they were when the + // value was read (see `StampSlot::value`). + (unsafe { &*((held & !1) as *const Object) }, held & 1 != 0) + } else { + let (hit, builtin) = match code.caches.get(pc as u32) { + IC::LoadGlobalModule { + globals_id, + key_idx, + } if globals_id == gid && stamp == [gid, g_stamp, 0] => { + (unsafe { (*gdict).get_index(key_idx as usize) }, false) + } + IC::LoadGlobalBuiltin { + builtins_id, + key_idx, + } if builtins_id == specialize::rc_id(&frame.builtins) + && !self.globals_missing_any.get() + && stamp + == [gid, g_stamp, unsafe { (*bdict).mutation_stamp() }] => + { + (unsafe { (*bdict).get_index(key_idx as usize) }, true) + } + _ => offload!(OFFLOAD_HELPER), + }; + let Some((_, v)) = hit else { + offload!(OFFLOAD_HELPER); + }; + slot.set_value(v, builtin); + (v, builtin) + }; + // `len(local)`: the length straight off the local. + if builtin { + if let Object::Builtin(f) = v { + if Rc::as_ptr(f) as usize == self.leaf_fns().len_ptr + && pc + 3 < ninstrs + { + // SAFETY: `pc + 3 < ninstrs`. + let (null, load, call) = unsafe { + ( + *instrs.add(pc + 1), + *instrs.add(pc + 2), + *instrs.add(pc + 3), + ) + }; + if null.op == OpCode::PushNull + && load.op == OpCode::LoadFast + && call.op == OpCode::Call + && call.arg == 1 + && (load.arg as usize) < nlocals { - // SAFETY: `pc + 3 < ninstrs`. - let (null, load, call) = unsafe { - ( - *instrs.add(pc + 1), - *instrs.add(pc + 2), - *instrs.add(pc + 3), - ) - }; - if null.op == OpCode::PushNull - && load.op == OpCode::LoadFast - && call.op == OpCode::Call - && call.arg == 1 - && (load.arg as usize) < nlocals - { - // SAFETY: `load.arg < nlocals`. - let n = match unsafe { &*lbase.add(load.arg as usize) } - { - // SAFETY: a read between two - // instructions. - Object::List(l) => { - unsafe { l.peek() }.map(Vec::len) - } - Object::Tuple(t) => Some(t.len()), - Object::Str(s) => { - Some(crate::object::str_char_len(s)) - } - // SAFETY: as above. - Object::Dict(d) => { - unsafe { d.peek() }.map(|d| d.len()) - } - // A native `__len__` (a deque's). - v @ Object::Instance(_) => { - match self.leaf_instance_len(v) { - Some(Object::Int(n)) => { - usize::try_from(n).ok() - } - _ => None, - } + // SAFETY: `load.arg < nlocals`. + let n = match unsafe { &*lbase.add(load.arg as usize) } { + // SAFETY: a read between two + // instructions. + Object::List(l) => unsafe { l.peek() }.map(Vec::len), + Object::Tuple(t) => Some(t.len()), + Object::Str(s) => Some(crate::object::str_char_len(s)), + // SAFETY: as above. + Object::Dict(d) => unsafe { d.peek() }.map(|d| d.len()), + // A native `__len__` (a deque's). + v @ Object::Instance(_) => { + match self.leaf_instance_len(v) { + Some(Object::Int(n)) => usize::try_from(n).ok(), + _ => None, } - _ => None, - }; - if let Some(n) = n.and_then(|n| i64::try_from(n).ok()) { - // SAFETY: `len < cap`. - unsafe { base.add(len).write(int_hot(n)) }; - len += 1; - last = pc + 3; - pc += 4; - continue; } + _ => None, + }; + if let Some(n) = n.and_then(|n| i64::try_from(n).ok()) { + // SAFETY: `len < cap`. + unsafe { base.add(len).write(int_hot(n)) }; + len += 1; + last = pc + 3; + pc += 4; + continue; } } } - hit } - _ => break Some(CoreExit::Helper), - }; - let Some((_, v)) = hit else { - break Some(CoreExit::Helper); - }; + } let v = match v { + // (Written here: a scalar copy that joins the + // other arms' values is split into field moves.) s @ (Object::Int(_) | Object::Float(_) | Object::Bool(_) - | Object::None) => scalar_copy(s), + | Object::None) => { + // SAFETY: `len < cap`. + unsafe { base.add(len).write(scalar_copy(s)) }; + len += 1; + last = pc; + pc += 1; + continue; + } // `f(...)` of a pure leaf global function with // simple arguments (see `core_pure_global_call`). Object::Function(f) @@ -13864,14 +14576,14 @@ impl Interpreter { break None; } let Some(cell) = frame.cells.get(ins.arg as usize) else { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); }; // SAFETY: a read between two instructions. let Some(v) = (unsafe { cell.peek() }) else { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); }; if matches!(v, Object::Unbound) { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } let c = Self::clone_operand(v); // SAFETY: `len < cap`. @@ -13890,7 +14602,7 @@ impl Interpreter { // loop's initialized stack. match unsafe { Self::core_super_attr(code, ins, pc, base, len) } { Some(n) => len = n, - None => break Some(CoreExit::Helper), + None => offload!(OFFLOAD_HELPER), } last = pc; pc += 1; @@ -13902,12 +14614,12 @@ impl Interpreter { // the site. OpCode::LoadSpecial => { if len == 0 || len == cap { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } // SAFETY: `len > 0`. let top = unsafe { base.add(len - 1) }; let Object::Instance(inst) = (unsafe { &*top }) else { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); }; let ver = inst.cls_raw().attr_version.get(); let ms = mslots!(cold_mslots, ext).get(pc); @@ -13916,7 +14628,7 @@ impl Interpreter { .map(Object::Function) .or_else(|| ms.get_inst_builtin(ver).map(Object::Builtin)) }) else { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); }; // SAFETY: `len < cap`; the instance moves up into // the self slot. @@ -13935,7 +14647,7 @@ impl Interpreter { // a class receiver leaves an empty self slot. OpCode::LoadMethodAttr => { if len == 0 || len == cap { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } // SAFETY: `len > 0`. let top = unsafe { base.add(len - 1) }; @@ -13955,7 +14667,7 @@ impl Interpreter { pc += 1; continue; } - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } // `module.func(...)`: the attribute off the site's // cached index (no method binds), with an empty self @@ -13963,7 +14675,7 @@ impl Interpreter { // SAFETY: as above. if let Object::Module(m) = unsafe { &*top } { let Some(v) = Self::core_module_attr(code, m, pc, ins.arg) else { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); }; // SAFETY: `len < cap`: `top` and the slot above. unsafe { @@ -13983,18 +14695,18 @@ impl Interpreter { // SAFETY: as above. if let Object::Instance(inst) = unsafe { &*top } { if !Self::default_getattribute(inst.cls_raw()) { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } if inst_may_shadow(inst, code, ins.arg) { // SAFETY: `len < cap`: `top` and the slot // above it. - if unsafe { Self::core_value_method(code, ins.arg, top) } { + if unsafe { Self::core_value_method(code, ins.arg, pc, top) } { len += 1; last = pc; pc += 1; continue; } - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } } let Some(ms) = mslots!(cold_mslots, ext).get(pc) else { @@ -14009,7 +14721,7 @@ impl Interpreter { pc += 1; continue; } - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); }; let f = match unsafe { &*top } { Object::Instance(inst) => { @@ -14055,7 +14767,7 @@ impl Interpreter { pc += 1; continue; } - None => break Some(CoreExit::Helper), + None => offload!(OFFLOAD_HELPER), }, }, }; @@ -14075,7 +14787,7 @@ impl Interpreter { Object::Type(cls) if Rc::strong_count(cls) > 1 => { match ms.get_held_unbound(cls.attr_version.get()) { Some(f) => f, - None => break Some(CoreExit::Helper), + None => offload!(OFFLOAD_HELPER), } } // A builtin receiver's site-cached method (the @@ -14085,7 +14797,7 @@ impl Interpreter { let Some(b) = builtin_recv_tag(recv).and_then(|tag| ms.get_builtin(tag)) else { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); }; // SAFETY: `len < cap`; the receiver moves up. unsafe { @@ -14116,7 +14828,7 @@ impl Interpreter { OpCode::LoadAttr => { use weavepy_compiler::InlineCache as IC; if len == 0 { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } // SAFETY: `len > 0`. let top = unsafe { base.add(len - 1) }; @@ -14147,7 +14859,7 @@ impl Interpreter { pc += 1; continue; } - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } } } @@ -14162,7 +14874,7 @@ impl Interpreter { pc += 1; continue; } - _ => break Some(CoreExit::Helper), + _ => offload!(OFFLOAD_HELPER), } } // A function's stored attribute (`wrapper.calls`). @@ -14174,20 +14886,21 @@ impl Interpreter { after_release!(); continue; } - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } // A builtin container's method read as a value // (`append = y.append`), a frame's or code // object's field (the helper's plain values). _ => { // SAFETY: `top` is the receiver's slot. - if unsafe { self.core_plain_attr(code, ins.arg, top) } { + let running = (Rc::as_ptr(&frame.locals).cast::<()>(), pc as u32); + if unsafe { self.core_plain_attr(code, ins.arg, top, running) } { last = pc; pc += 1; after_release!(); continue; } - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } }; // A natively served instance's public field (see @@ -14202,7 +14915,7 @@ impl Interpreter { pc += 1; continue; } - _ => break Some(CoreExit::Helper), + _ => offload!(OFFLOAD_HELPER), } } // SAFETY: a read between two instructions (see @@ -14230,7 +14943,7 @@ impl Interpreter { pc += 1; continue; } - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } }; let cls = inst.cls_raw(); @@ -14238,19 +14951,19 @@ impl Interpreter { || cls.native_kind.get() != 0 || !Self::core_droppable(unsafe { &*top }) { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } // SAFETY: a read between two instructions (see // `GilCell::peek`). let Some((k, v)) = (unsafe { inst.attr_peek_index(key_idx as usize) }) else { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); }; if !slot_name_matches(code, ins.arg, k) { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } if let Some(e) = ext { - field_slot_note(e, ninstrs, pc, inst, key_idx); + field_slot_note(e, code, pc, inst, key_idx); } let v = Self::clone_operand(v); // SAFETY: the receiver (droppable) is replaced in place. @@ -14262,7 +14975,7 @@ impl Interpreter { // droppable one (the helper's `leaf_store_attr` first case). OpCode::StoreAttr => { if len < 2 { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } // SAFETY: `len >= 2`. let (recv, val) = unsafe { (&*base.add(len - 1), &*base.add(len - 2)) }; @@ -14281,14 +14994,29 @@ impl Interpreter { after_release!(); continue; } - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); + } + // A plain class's own attribute (`Cls.count = n`). + Object::Type(_) => { + // SAFETY: `len >= 2`: the receiver over the + // value. + if unsafe { + Self::core_class_store(code, ins.arg, base.add(len - 1)) + } { + len -= 2; + last = pc; + pc += 1; + after_release!(); + continue; + } + offload!(OFFLOAD_HELPER); } - _ => break Some(CoreExit::Helper), + _ => offload!(OFFLOAD_HELPER), }; if !Self::core_droppable(recv) || !Self::core_store_attr(code, inst, pc, ins.arg, val) { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } // SAFETY: the value moved into the dict (its slot is a // stand-in now) and the receiver leaves the stack by a @@ -14332,7 +15060,7 @@ impl Interpreter { _ => false, }; if !ok { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } last = pc; pc += 1; @@ -14345,7 +15073,7 @@ impl Interpreter { let fresh = len > 0 && match unsafe { &*base.add(len - 1) } { // SAFETY: a read between instructions. - Object::Coroutine(g) => unsafe { g.state.peek() } + Object::Coroutine(g) => unsafe { g.state().peek() } .is_some_and(|s| matches!(s, GeneratorState::Created(_))), // A `types.coroutine` generator is its own. Object::Generator(g) => { @@ -14376,7 +15104,7 @@ impl Interpreter { continue; } } - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } } break Some(CoreExit::Stop(LeafStop::Step)); @@ -14459,9 +15187,7 @@ impl Interpreter { // SAFETY: the parts leave the stack (a string's release // runs nothing); the join takes the first slot. unsafe { - for k in len - n..len { - drop_hot(base.add(k).read()); - } + release_run(base.add(len - n), n); base.add(len - n).write(joined); } len = len - n + 1; @@ -14514,10 +15240,23 @@ impl Interpreter { // leaf arms' shapes, which the full handlers' match). // An `except` clause's entry, test and exit (see // `core_exc_op`). + // `del obj.attr` of a plain instance's own attribute (see + // `core_delete_attr`); anything else is the full arm's. + OpCode::DeleteAttr => { + // SAFETY: the `len` slots at `base` are the core + // loop's initialized stack. + match unsafe { self.core_delete_attr(code, ins, pc, base, len) } { + Some(n) => len = n, + None => break None, + } + last = pc; + pc += 1; + after_release!(); + } OpCode::PushExcInfo | OpCode::CheckExcMatch | OpCode::PopExcept => { // SAFETY: the `len` slots at `base` are the core // loop's initialized stack, with room to `cap`. - match unsafe { self.core_exc_op(&mut frame.exc, ins, base, len, cap) } { + match unsafe { self.core_exc_op(ins, base, len, cap) } { Some(n) => len = n, None => break None, } @@ -14549,7 +15288,7 @@ impl Interpreter { // arm), when the iterable leaves by a plain decrement. OpCode::GetIter => { if len == 0 { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } // SAFETY: `len > 0`. let top = unsafe { base.add(len - 1) }; @@ -14575,10 +15314,10 @@ impl Interpreter { | Object::Str(_) ) || !Self::core_droppable(v) { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); } let Ok(it) = v.make_iter() else { - break Some(CoreExit::Helper); + offload!(OFFLOAD_HELPER); }; let it = Object::Iter(Rc::new(RefCell::new(it))); // SAFETY: the iterable (droppable) is replaced in place. @@ -14594,7 +15333,7 @@ impl Interpreter { op if !SLOW_LEAF_OPS[op as u8 as usize] => { break Some(CoreExit::Stop(LeafStop::Step)) } - _ => break None, + _ => offload!(OFFLOAD_ARMS), } }; if matches!(stop, Some(CoreExit::Reload)) { @@ -14610,6 +15349,33 @@ impl Interpreter { } } + /// [`Self::core_pending_enter`] with its commonest case in line: the + /// caller an inline activation other than the burst's entry, with no + /// shell yet (the call paths' callers). + #[inline(always)] + fn core_pending_enter_fast( + &mut self, + sw: &mut CoreSwitch, + frame: &mut Frame, + pc: usize, + ) -> Option { + // SAFETY: as `core_pending_enter`. + unsafe { + let inl: &mut Vec> = &mut *sw.inl; + let depth = inl.len(); + if depth != 0 && (depth != sw.entry_depth || sw.entry_dead) { + let caller: &mut InlineAct = &mut inl[depth - 1]; + if caller.act.shell.is_none() { + caller.act.frame = std::ptr::from_mut(frame); + let addr = std::ptr::from_mut::(&mut caller.act) as usize; + push_fast(&mut self.lean_pending, addr); + return Some(addr); + } + } + } + self.core_pending_enter(sw, frame, pc) + } + /// Put `sw`'s running activation, `frame` (synced, suspended at the /// call at `pc`), on the pending list (see [`Self::lean_pending_enter`]) /// while code it calls runs: anything that needs the whole spine then @@ -14739,8 +15505,8 @@ impl Interpreter { /// body must be reached through [`Self::call`]'s interpreter-aware /// dispatch. A method must be bound to its exact builtin receiver; a /// function must be one of the common builtins that never look at the - /// calling frame (`locals()`, `sys._getframe()` and the like keep the - /// full handler, which makes the frame stack whole first). + /// calling frame, or make the frame stack whole themselves (`locals()` + /// and the like keep the full handler, which makes it whole first). fn builtin_lane( &self, b: &Rc, @@ -14761,10 +15527,21 @@ impl Interpreter { } // `super().__init__(...)` in an exception class's own // `__init__`: `BaseException.__init__` on the instance, - // through the full handler's dispatch. - if exception_init_call(b, recv) { + // through the full handler's dispatch; likewise + // `x.__reduce_ex__(4)` of a plain instance (`copy`, + // `pickle`), which may run `copyreg` code. + if exception_init_call(b, recv) + || (matches!(b.name, ".object_reduce_ex" | ".object_reduce") + && matches!(recv, Object::Instance(_))) + { return Some(true); } + // `super().__init__(...)` reaching `object.__init__` (or + // another native `__init__`) on a plain instance: the + // dispatch's only `__init__` case is a dict payload's. + if native_init_call(b, recv) { + return Some(false); + } // The names below are dispatched by the interpreter, which // knows them on the builtin kinds' receivers. builtins::method_memo_tag(recv)?; @@ -14777,120 +15554,39 @@ impl Interpreter { /// The core loop's `CALL` at `pc` of a non-leaf builtin the site settled /// on (see [`Self::builtin_lane`]), in `sw`'s synced running activation: /// a builtin type's method on its exact receiver, as `(method, receiver)` - /// or as a bound method with an empty self slot, or a builtin function. - /// The body runs directly, or with `via_call` through [`Self::call`], as - /// the full handler's dispatch ends up running it, without that - /// handler's chain of special cases. The body may run Python code (an - /// element's `__eq__`, a key function), so the operands leave the stack - /// first, the activation waits on the pending list meanwhile, and the - /// core loop reloads after. `false` touches nothing. + /// or as a bound method with an empty self slot, or a builtin function, + /// run by [`Self::core_native_body`]. The core loop reloads after. + /// `false` touches nothing. #[inline(never)] fn core_builtin_lane(&mut self, sw: &mut CoreSwitch, pc: usize, via_call: bool) -> bool { - const MAX_ARGS: usize = 8; // SAFETY: see `CoreSwitch`: the running activation is synced and // unborrowed here. let frame = unsafe { &mut *sw.cur }; let Some(ins) = frame.code.instructions.get(pc) else { return false; }; - let argc = ins.arg as usize; - let n = frame.stack.len(); - let Some(callee_at) = n.checked_sub(argc + 2) else { + let Some(callee_at) = frame.stack.len().checked_sub(ins.arg as usize + 2) else { return false; }; - let (b, receiver) = match (&frame.stack[callee_at], &frame.stack[callee_at + 1]) { - (Object::Builtin(b), Object::Unbound) => (b, None), - (Object::Builtin(b), recv) => (b, Some(recv)), - (Object::BoundMethod(bm), Object::Unbound) if !bm.redispatch_descriptor => { - match &bm.function { - Object::Builtin(b) => (b, Some(&bm.receiver)), - _ => return false, + let b: *const crate::object::BuiltinFn = + match (&frame.stack[callee_at], &frame.stack[callee_at + 1]) { + (Object::Builtin(b), Object::Unbound) if !b.binds_instance => Rc::as_ptr(b), + (Object::Builtin(b), recv) if lane_recv_ok(b, recv, via_call) => Rc::as_ptr(b), + (Object::BoundMethod(bm), Object::Unbound) if !bm.redispatch_descriptor => { + match &bm.function { + Object::Builtin(b) if lane_recv_ok(b, &bm.receiver, via_call) => { + Rc::as_ptr(b) + } + _ => return false, + } } - } - _ => return false, - }; - let ok = argc < MAX_ARGS - && match receiver { - Some(recv) => { - b.binds_instance - && (!via_call - || builtins::method_memo_tag(recv).is_some() - || exception_init_call(b, recv) - || (matches!(b.name, ".object_reduce_ex" | ".object_reduce") - && matches!(recv, Object::Instance(_)))) - } - None => !b.binds_instance, + _ => return false, }; - if !ok { - return false; - } - let (b, receiver) = (b.clone(), receiver.cloned()); - // Committed. The receiver and the arguments move into `buf`; the - // self slot and the callable leave the stack. - let mut buf = [const { std::mem::MaybeUninit::::uninit() }; MAX_ARGS + 1]; - let first = usize::from(receiver.is_some()); - if let Some(receiver) = receiver { - buf[0].write(receiver); - } - // SAFETY: the `argc` operands above the self slot move into `buf` - // (`argc < MAX_ARGS`) and the stack forgets them. - unsafe { - let src = frame.stack.as_ptr().add(callee_at + 2); - for k in 0..argc { - buf[first + k].write(src.add(k).read()); - } - frame.stack.set_len(callee_at + 2); - } - let self_slot = frame.stack.pop(); - let callable = frame.stack.pop(); - frame.pc = pc as u32 + 1; - // SAFETY: the first `first + argc` entries were written above. - let ops = unsafe { - std::slice::from_raw_parts_mut(buf.as_mut_ptr().cast::(), first + argc) - }; - // The body may run Python code that looks up the stack. - let pending = self.core_pending_enter(sw, frame, pc); - let result = if via_call { - let globals = frame.globals.clone(); - self.call(&Object::Builtin(b.clone()), ops, &[], &globals) - } else { - match b.call_kw.as_ref() { - Some(call_kw) => call_kw(ops, &[]), - None => (b.call)(ops), - } - }; - self.core_pending_exit(sw, pending); - // The operands drop as the full handler's do, after the call. - // SAFETY: each initialized entry drops exactly once; `buf` itself - // has no drop glue. - unsafe { std::ptr::drop_in_place(ops) }; - for o in [callable, self_slot].into_iter().flatten() { - // A scalar or a shared builtin leaves by a plain drop; anything - // else as the full handler releases it. - if matches!( - o, - Object::Int(_) - | Object::Float(_) - | Object::Bool(_) - | Object::None - | Object::Unbound - | Object::Builtin(_) - ) { - drop(o); - } else { - self.release(o); - } - } - drop(b); - match result { - Ok(v) => { - // SAFETY: as above (the body ran nested activations of its - // own, never this one). - unsafe { (*sw.cur).stack.push(v) }; - // SAFETY: the running activation's last-pc slot. - unsafe { *sw.last = pc }; - } - Err(e) => sw.pending = Some(CoreExit::Stop(LeafStop::Raised(e))), + // SAFETY: the activation is synced, and the shape was checked. + match unsafe { self.core_native_body(sw, frame, pc, callee_at, b, via_call) } { + // SAFETY: the running activation's last-pc slot. + None => unsafe { *sw.last = pc }, + Some(e) => sw.pending = Some(CoreExit::Stop(LeafStop::Raised(e))), } // A finalizer queued by a dying operand runs before the next // instruction, as after the full handler's call. @@ -14901,6 +15597,88 @@ impl Interpreter { true } + /// The body of the non-leaf builtin `b` for the `CALL` at `pc` of `sw`'s + /// running activation `frame` (synced, its operands from `start` to the + /// top of its stack): `b` is the callee itself (a method with its + /// receiver in the self slot, or a function with the slot empty) or a + /// bound method's function, whose receiver fills the empty self slot + /// here. The body runs directly, or with `via_call` through + /// [`Self::call`], as the full handler's dispatch ends up running it, + /// on the operands where they are (as a vectorcall reads them, the + /// stack holding them), with the activation waiting on the pending + /// list: the body may run Python code (an element's `__eq__`, a key + /// function). Then the operands leave as the full handler's do, the + /// arguments first, then the receiver and the callable, and the result + /// takes the callee's slot: `None`, the stack ending past it, or the + /// error raised, the stack ending at `start`. + /// + /// # Safety + /// + /// `frame` is `sw`'s synced running activation, unborrowed elsewhere; + /// the callee at `start` is `b` (or a bound method of it) in a shape + /// [`Self::core_builtin_lane`] admits. + #[inline(never)] + pub(crate) unsafe fn core_native_body( + &mut self, + sw: &mut CoreSwitch, + frame: &mut Frame, + pc: usize, + start: usize, + b: *const crate::object::BuiltinFn, + via_call: bool, + ) -> Option { + let len = frame.stack.len(); + // SAFETY: the caller's contract: `start + 2 <= len`; the stack + // isn't resized while the body runs (nested code runs activations + // of its own). + unsafe { + let base = frame.stack.as_mut_ptr(); + if matches!(&*base.add(start + 1), Object::Unbound) { + if let Object::BoundMethod(bm) = &*base.add(start) { + // (The empty self slot needs no release.) + base.add(start + 1).write(bm.receiver.clone()); + } + } + let first = if matches!(&*base.add(start + 1), Object::Unbound) { + start + 2 + } else { + start + 1 + }; + frame.pc = pc as u32 + 1; + // The body may run Python code that looks up the stack. + let pending = self.core_pending_enter_fast(sw, frame, pc); + let args = std::slice::from_raw_parts(base.add(first), len - first); + let result = if via_call { + let globals = frame.globals.clone(); + match &*base.add(start) { + callable @ Object::Builtin(_) => self.call(callable, args, &[], &globals), + callable => self.call(&bm_builtin(callable), args, &[], &globals), + } + } else { + let b = &*b; + match b.call_kw.as_ref() { + Some(call_kw) => call_kw(args, &[]), + None => (b.call)(args), + } + }; + self.core_pending_exit(sw, pending); + // The operands leave the stack, then are released: the + // arguments, the receiver, the callable. + frame.stack.set_len(start); + release_operands(self, base.add(start + 2), len - start - 2); + release_operands(self, base.add(start + 1), 1); + release_operands(self, base.add(start), 1); + match result { + Ok(v) => { + base.add(start).write(v); + frame.stack.set_len(start + 1); + None + } + Err(e) => Some(e), + } + } + } + /// A `BINARY_OP` or `COMPARE_OP` at `sw`'s running activation's `pc` /// with an instance operand (a Python dunder, `Vector.__sub__`): the /// full handler's own step, run with the activation on the pending @@ -15044,6 +15822,11 @@ impl Interpreter { if len < 5 { return false; } + if self.core_with_exit_inline(sw, pc) { + return true; + } + // SAFETY: as above (nothing was touched). + let frame = unsafe { &mut *sw.cur }; // [exit_func, exit_self, lasti, prev, exc], as the full handler. let exc = frame.stack[len - 1].clone(); let exit_self = frame.stack[len - 4].clone(); @@ -15080,6 +15863,82 @@ impl Interpreter { true } + /// [`Self::core_with_exit_lane`] for an exit method that is a plain + /// Python function of the manager (`LOAD_SPECIAL` left the function + /// under its instance): the call `exit(self, type, exc, tb)` runs as an + /// inline activation switched to here, as a `CALL 3` of the same + /// operands would, instead of nested through [`Self::call`]. Its + /// return lands on the stack past the `WITH_EXCEPT_START`; a raise + /// propagates from it as from a call there. `false` touches nothing. + #[inline(never)] + fn core_with_exit_inline(&mut self, sw: &mut CoreSwitch, pc: usize) -> bool { + if !self.inline_calls_ok() { + return false; + } + let code = { + // SAFETY: see `CoreSwitch`: the running activation is synced + // and unborrowed here. + let frame = unsafe { &*sw.cur }; + let len = frame.stack.len(); + // [exit_func, exit_self, lasti, prev, exc], as the full handler. + let (Object::Function(f), exit_self, Object::Instance(_)) = ( + &frame.stack[len - 5], + &frame.stack[len - 4], + &frame.stack[len - 1], + ) else { + return false; + }; + // A pure leaf is evaluated in place through `call` (see + // `call_pure_leaf`), cheaper than any activation. + if matches!(exit_self, Object::Unbound) || fn_is_pure_leaf(f) { + return false; + } + match Self::lean_call_shape_cells(f, 4, true) { + Some(shape) => shape, + None => return false, + } + }; + let (code, missing) = code; + // Past the recursion limit the nested call raises. + let crate::recursion::Enter::Ok(guard) = crate::recursion::enter() else { + return false; + }; + let mut tmp = None; + // SAFETY: see `CoreSwitch` (as in `core_call`): the running + // activation is the innermost; its handles are live and unborrowed. + let act = unsafe { + let depth = (*sw.inl).len(); + let (frame, _, shell) = sw.activation(depth, &mut tmp); + let (frame, shell) = (&mut *frame, &mut *shell.cast::>()); + let len = frame.stack.len(); + let Object::Instance(inst) = &frame.stack[len - 1] else { + unreachable!("checked above") + }; + let ty = Object::Type(inst.cls()); + let tb = inst.slot_get("__traceback__").unwrap_or(Object::None); + let exc = frame.stack[len - 1].clone(); + let exit_self = frame.stack[len - 4].clone(); + let exit_func = frame.stack[len - 5].clone(); + // Committed: the call's operands, as a `CALL 3` sees them. + frame.stack.extend([exit_func, exit_self, ty, exc, tb]); + let n = frame.stack.len(); + let act = self.inline_slot(); + // SAFETY: a parked slot's locals storage is its own, and empty. + let locals = &mut *act.frame.locals.as_ptr(); + let callable = Self::lean_call_fill(frame, &code, true, n - 4, n - 5, missing, locals); + frame.pc = pc as u32 + 1; + self.inline_bind(frame, shell, pc, act, code, callable, guard) + }; + let mut act = act; + let callee: *mut Frame = &raw mut *act.frame; + // SAFETY: as above. + unsafe { push_fast(&mut *sw.inl, act) }; + sw.cur = callee; + sw.scratch = usize::MAX; + sw.last = &raw mut sw.scratch; + true + } + /// [`Self::core_builtin_lane`] for the `CALL_KW` at `pc` of a builtin /// function the lane admits (`sorted(xs, key=f)`), in `sw`'s synced /// running activation: the operands leave the stack, the call runs @@ -15179,7 +16038,13 @@ impl Interpreter { let Some(slot) = code_call_slot(&frame.code, pc) else { return false; }; - if slot.hit(fp, Rc::as_ptr(code_rc)) != Some((0, has_self)) + let Some((missing, true)) = slot + .hit(fp, Rc::as_ptr(code_rc)) + .map(|(missing, s)| (missing as usize, s == has_self)) + else { + return false; + }; + if (missing > 0 && !Self::defaults_cover(f, missing)) || !code_rc.cellvars.is_empty() || !code_rc.freevars.is_empty() || !f.closure.is_empty() @@ -15197,32 +16062,60 @@ impl Interpreter { return false; }; // SAFETY: as above; the checks above hold. - unsafe { self.core_bind_plain(sw, pc, callee_slot, has_self, fp, act, guard) }; + unsafe { + self.core_bind_plain::( + sw, + pc, + callee_slot, + has_self, + missing, + false, + fp, + act, + guard, + false, + ) + }; true } - /// The committed half of [`Self::core_call_plain`]: the arguments of + /// Whether `f`'s compiled positional defaults (`__defaults__` never + /// rebound) cover the last `missing` parameters. + #[inline] + fn defaults_cover(f: &PyFunction, missing: usize) -> bool { + f.defaults.len() >= missing && !f.defaults_maybe_overridden() + } + + /// The committed half of [`Self::core_call_plain`] (`held`: the slot + /// is a direct call site's warm one, holding the callee's code): the + /// arguments of /// the `CALL` at `pc` of `sw`'s running activation (the callable at /// `callee_slot`, its self slot filled when `has_self`) move into the /// pooled slot `act`'s locals, and `act`, bound to the plain function /// `fp` (with exactly its arity) under the recursion `guard`, is - /// pushed and made the running activation. + /// pushed and made the running activation. The last `missing` + /// parameters take `fp`'s positional defaults. `DIRECT` marks the + /// activation a direct call's (see `frame_jit::direct_call`). /// /// # Safety /// /// The running activation is synced and unborrowed, and the call's - /// shape is one `core_call_plain` admits. + /// shape is one `core_call_plain` admits (the defaults cover + /// `missing`, see [`Self::defaults_cover`]). #[inline(always)] #[allow(clippy::too_many_arguments)] - unsafe fn core_bind_plain( + unsafe fn core_bind_plain( &mut self, sw: &mut CoreSwitch, pc: usize, callee_slot: usize, has_self: bool, + missing: usize, + cells: bool, fp: *const crate::object::PyFunction, - mut act: Box, + act: Box, guard: crate::recursion::Guard, + held: bool, ) -> *mut Frame { // SAFETY: the caller's contract. let frame = unsafe { &mut *sw.cur }; @@ -15232,8 +16125,7 @@ impl Interpreter { let code_rc: &Rc = unsafe { &*(*fp).code.as_ptr() }; // Committed. The arguments move into the slot's (empty, sole-owned) // locals; the callable and the empty self slot leave the stack. - let code = code_rc.clone(); - let nlocals = code.varnames.len(); + let nlocals = code_rc.varnames.len(); // SAFETY: a parked slot's locals storage is its own, and empty. let locals = unsafe { &mut *act.frame.locals.as_ptr() }; let first = if has_self { @@ -15242,28 +16134,130 @@ impl Interpreter { callee_slot + 2 }; let nargs = n - first; - locals.reserve(nlocals.max(nargs)); + let total = nlocals.max(nargs + missing); + if locals.capacity() < total { + locals.reserve(total); + } // SAFETY: the `nargs` operands above `first` move into the locals - // (reserved above) and the stack forgets them; the callable moves - // out of its slot, and an empty self slot owns nothing. + // (reserved above) and the stack forgets them, the defaults follow + // as copies, and the other locals start unbound, in one pass; the + // callable moves out of its slot, and an empty self slot owns + // nothing. let callable = unsafe { let (src, dst) = (frame.stack.as_ptr().add(first), locals.as_mut_ptr()); - for k in 0..nargs { - dst.add(k).write(src.add(k).read()); + move_objects(src, dst, nargs); + let mut k = nargs; + if missing > 0 { + let defaults = &(*fp).defaults; + for d in &defaults[defaults.len() - missing..] { + dst.add(k).write(clone_hot(d)); + k += 1; + } } - locals.set_len(nargs); + fill_unbound_raw(dst.add(k), total - k); + locals.set_len(total); let callable = frame.stack.as_ptr().add(callee_slot).read(); frame.stack.set_len(callee_slot); callable }; - fill_unbound(locals, nlocals); + // SAFETY: as above. + unsafe { + self.core_bind_act::( + sw, frame, pc, fp, code_rc, act, guard, held, cells, callable, + ) + } + } + + /// [`Self::core_bind_plain`] for the `CALL_KW` at `pc` of `sw`'s + /// running activation (a direct call's, see `frame_jit::h_call_kw`): + /// the site's verified `CallPyKwNames` permutation `perm` places the + /// `kwc` keyword values, the `argc` positionals (after the receiver + /// when `has_self`) take the first slots, and the parameters `covered` + /// doesn't name take their defaults (see `kw_names_fill_locals`). + /// + /// # Safety + /// + /// As [`Self::core_bind_plain`]'s, with the names tuple on the stack's + /// top and a callee with no cells and no `**kwargs`. + #[allow(clippy::too_many_arguments)] + pub(crate) unsafe fn core_bind_kw_direct( + &mut self, + sw: &mut CoreSwitch, + pc: usize, + has_self: bool, + fp: *const crate::object::PyFunction, + (perm, covered, kwc, argc): (u32, u32, usize, usize), + act: Box, + guard: crate::recursion::Guard, + ) -> *mut Frame { + // SAFETY: the caller's contract. + unsafe { + let frame = &mut *sw.cur; + let code_rc: &Rc = &*(*fp).code.as_ptr(); + // A parked slot's locals storage is its own, and empty. + let locals = &mut *act.frame.locals.as_ptr(); + let names = frame.stack.pop().expect("the names tuple"); + let items: &[Object] = match &names { + Object::Tuple(t) => t, + _ => &[], + }; + Self::kw_names_fill_locals( + locals, + &mut frame.stack, + items, + &*fp, + code_rc, + perm, + covered, + kwc, + argc + usize::from(has_self), + ); + drop_hot(names); + if !has_self { + // The empty self slot owns nothing. + let n = frame.stack.len(); + frame.stack.set_len(n - 1); + } + let callable = frame.stack.pop().expect("the callee"); + self.core_bind_act::( + sw, frame, pc, fp, code_rc, act, guard, false, false, callable, + ) + } + } + + /// The common half of [`Self::core_bind_plain`] and + /// [`Self::core_bind_kw_direct`]: `act`, its locals filled and + /// `callable` off the caller's stack, bound to `fp` and pushed as the + /// running activation, the caller (`frame`) waiting past its call. + /// + /// # Safety + /// + /// As [`Self::core_bind_plain`]'s. + #[inline(always)] + #[allow(clippy::too_many_arguments)] + unsafe fn core_bind_act( + &mut self, + sw: &mut CoreSwitch, + frame: &mut Frame, + pc: usize, + fp: *const crate::object::PyFunction, + code_rc: &Rc, + mut act: Box, + guard: crate::recursion::Guard, + held: bool, + cells: bool, + callable: Object, + ) -> *mut Frame { frame.pc = pc as u32 + 1; // SAFETY: the slot is parked (see `inline_bind_cells`): its handles // are stale copies, overwritten without a drop. `fp` stays alive // while the slot holds `callable`. unsafe { let fr: &mut Frame = &mut act.frame; - std::ptr::write(&raw mut fr.code, code); + // (A warm slot, `held`, holds this code already.) + if !held { + std::ptr::write(&raw mut fr.code, code_rc.clone()); + } std::ptr::write( &raw mut fr.cells, borrowed_rc(crate::object::empty_cells_ref()), @@ -15271,12 +16265,16 @@ impl Interpreter { std::ptr::write(&raw mut fr.globals, borrowed_rc(&(*fp).globals)); std::ptr::write(&raw mut fr.builtins, borrowed_rc(&(*fp).builtins)); std::ptr::write(&raw mut act.callable, callable); + if cells { + Self::bind_call_cells(&mut act, &*fp); + } } act.frame.pc = 0; act.parked = false; + act.direct = DIRECT; act.call_pc = pc; // The caller waits on the pending list (see `lean_pending_enter`). - act.caller_pending = self.core_pending_enter(sw, frame, pc); + act.caller_pending = self.core_pending_enter_fast(sw, frame, pc); act.exc_depth = self.exc_info_len(); act.guard = Some(guard); // As `inline_bind_cells`: a hot body is compiled once, so native @@ -15301,6 +16299,33 @@ impl Interpreter { callee } + /// [`Self::core_bind_plain`]'s cells for a callee with cell or free + /// variables (a direct call's, see `frame_jit::direct_body`): fresh + /// cells of its own (its parameters that are cells move into them, as + /// `inline_bind` binds them), or its closure's lean cells, which `f` + /// holds (see `PyFunction::lean_cells_ref`). + /// + /// # Safety + /// + /// `act` is freshly bound to `f` (its locals filled, its cells handle + /// a stale copy, overwritten without a drop). + #[cold] + #[inline(never)] + unsafe fn bind_call_cells(act: &mut InlineAct, f: &PyFunction) { + // SAFETY: the caller's contract; the code outlives the binding. + unsafe { + let code: &CodeObject = &*Rc::as_ptr(&act.frame.code); + if code.cellvars.is_empty() { + let cells = f.lean_cells_ref(code).expect("checked by the call"); + std::ptr::write(&raw mut act.frame.cells, borrowed_rc(cells)); + } else { + let cells = fresh_cells(f, code, &mut *act.frame.locals.as_ptr()); + std::ptr::write(&raw mut act.frame.cells, cells); + act.owns_cells = true; + } + } + } + /// A bound method over a plain function with an empty self slot, /// called at `pc` of `frame`, becomes that function with the receiver /// as self (CPython's `CALL_BOUND_METHOD_EXACT_ARGS`), so the cached @@ -15476,6 +16501,34 @@ impl Interpreter { true } + /// [`Self::core_getitem`] for a `STORE_SUBSCR` the instance's Python + /// `__setitem__` serves ([`Self::try_inline_setitem`]). `false` + /// touches nothing. + #[inline(never)] + fn core_setitem(&mut self, sw: &mut CoreSwitch) -> bool { + if !self.inline_calls_ok() { + return false; + } + let mut tmp = None; + // SAFETY: see `CoreSwitch` (as in `core_call`). + let act = unsafe { + let depth = (*sw.inl).len(); + let (frame, _, shell) = sw.activation(depth, &mut tmp); + let pc = (*frame).pc as usize; + self.try_inline_setitem(&mut *frame, &mut *shell.cast::>(), pc) + }; + let Some(mut act) = act else { + return false; + }; + let callee: *mut Frame = &raw mut *act.frame; + // SAFETY: as above. + unsafe { push_fast(&mut *sw.inl, act) }; + sw.cur = callee; + sw.scratch = usize::MAX; + sw.last = &raw mut sw.scratch; + true + } + /// The core loop's `CALL` at `pc` of a registered leaf builtin whose /// leaf half declined the operands (`len(obj)` of an instance with a /// Python `__len__`, say): the call runs through [`Self::call`] in @@ -15483,8 +16536,9 @@ impl Interpreter { /// nothing. #[inline(never)] /// The `CALL` at the running activation's pc of an exact builtin - /// container type over one positional argument (`set(genexpr)`, - /// `list(xs)`), through the ordinary call with the caller published + /// container type (or `weakref.ref`, or `types.MappingProxyType`) over + /// one positional argument (`set(genexpr)`, `list(xs)`), through the + /// ordinary call with the caller published /// (consuming the argument may run Python code), as the builtin lane /// runs a builtin function. `false` touches nothing. fn core_type_lane(&mut self, sw: &mut CoreSwitch) -> bool { @@ -15511,6 +16565,9 @@ impl Interpreter { if ![&bt.list_, &bt.tuple_, &bt.set_, &bt.frozenset_, &bt.dict_] .iter() .any(|t| Rc::ptr_eq(t, ty)) + // (`weakref.ref(obj)` and `types.MappingProxyType(mapping)`, + // as `inspect` makes them, read no frame either.) + && !(ty.flags.is_builtin && matches!(ty.name.as_str(), "ReferenceType" | "mappingproxy")) { return false; } @@ -15549,7 +16606,8 @@ impl Interpreter { /// `CALL_KW` or `CALL_FUNCTION_EX` (an exact tuple, and no `**` or an /// exact dict of `str` keys) at the running activation's pc, of a /// class or a Python function the inline paths declined (a class with - /// its own `__new__`, a callee binding `*args`): the call runs through + /// its own `__new__`, a callee binding `*args`), or of a builtin the + /// builtin lane takes, spread without keywords: the call runs through /// the ordinary protocol with this activation published, as the /// builtin lane runs a builtin. Zero-argument `super` (which reads its /// caller's frame) stays the full handler's. `false` touches nothing. @@ -15583,11 +16641,26 @@ impl Interpreter { } _ => return false, }; + // (A builtin the `CALL` arm's builtin lane takes, spread from a + // tuple without keywords: `callback(*args, **kwds)` of a bound + // `list.clear`.) + let mut builtin = false; let ok = match &frame.stack[callee_at] { Object::Type(t) => !Rc::ptr_eq(t, &builtin_types().super_), Object::Function(_) => true, - Object::BoundMethod(bm) => { - !bm.redispatch_descriptor && matches!(bm.function, Object::Function(_)) + Object::BoundMethod(bm) if !bm.redispatch_descriptor => match &bm.function { + Object::Function(_) => true, + Object::Builtin(b) if ins.op == OpCode::CallEx => { + builtin = true; + matches!(frame.stack[callee_at + 1], Object::Unbound) + && self.builtin_lane(b, Some(&bm.receiver)).is_some() + } + _ => false, + }, + Object::Builtin(b) if ins.op == OpCode::CallEx => { + builtin = true; + matches!(frame.stack[callee_at + 1], Object::Unbound) + && self.builtin_lane(b, None).is_some() } _ => false, }; @@ -15596,7 +16669,10 @@ impl Interpreter { } let ops = &frame.stack[callee_at..]; let mut args: Vec = Vec::new(); - let mut kwargs: Vec<(String, Object)> = Vec::new(); + // The keywords' names are the call's own `str` objects (the site's + // names tuple, the `**` mapping's keys). + let mut kwnames: Vec = Vec::new(); + let mut kwvals: Vec = Vec::new(); if !matches!(ops[1], Object::Unbound) { args.push(ops[1].clone()); } @@ -15608,10 +16684,11 @@ impl Interpreter { let npos = values.len() - names.len(); args.extend(values[..npos].iter().cloned()); for (name, v) in names.iter().zip(&values[npos..]) { - let Object::Str(name) = name else { + if !matches!(name, Object::Str(_)) { return false; - }; - kwargs.push((name.to_string(), v.clone())); + } + kwnames.push(name.clone()); + kwvals.push(v.clone()); } } else { let Object::Tuple(items) = &ops[2] else { @@ -15625,25 +16702,62 @@ impl Interpreter { return false; }; for (k, v) in d.iter() { - let Object::Str(name) = &k.0 else { + if !matches!(k.0, Object::Str(_)) { return false; - }; - kwargs.push((name.to_string(), v.clone())); + } + kwnames.push(k.0.clone()); + kwvals.push(v.clone()); } } _ => return false, } } + if builtin && !kwnames.is_empty() { + return false; + } + // A keyword call of a plain function decides the site's + // `CallPyKwNames` specialization here, as the full handler does: + // the core loop takes every execution of the site, so without it + // the in-place and inline keyword calls would never apply. + if ins.op == OpCode::CallKw { + if let Object::Function(f) = &frame.stack[callee_at] { + Self::core_specialize_call_kw(&frame.code, pc, f, args.len(), &kwnames); + } + } // Committed: the operands leave the stack. let callee = frame.stack[callee_at].clone(); let operands: Vec = frame.stack.drain(callee_at..).collect(); let globals = frame.globals.clone(); frame.pc = pc as u32 + 1; let pending = self.core_pending_enter(sw, frame, pc); - let result = self.call(&callee, &args, &kwargs, &globals); + // A Python function binds its keywords by name objects; anything + // else takes them as strings. + let target = match &callee { + Object::Function(f) if !kwnames.is_empty() => Some((f.clone(), None)), + Object::BoundMethod(bm) if !kwnames.is_empty() => match &bm.function { + Object::Function(f) => Some((f.clone(), Some(bm.receiver.clone()))), + _ => None, + }, + _ => None, + }; + let result = match target { + Some((f, receiver)) => { + if let Some(r) = receiver { + args.insert(0, r); + } + self.call_python_kw_names(&f, args, &kwnames, kwvals) + } + None => { + let kwargs: Vec<(String, Object)> = + kwnames.iter().map(Object::to_str).zip(kwvals).collect(); + let r = self.call(&callee, &args, &kwargs, &globals); + drop(args); + drop(kwargs); + r + } + }; self.core_pending_exit(sw, pending); - drop(args); - drop(kwargs); + drop(kwnames); drop(callee); for o in operands { self.release(o); @@ -15662,6 +16776,69 @@ impl Interpreter { true } + /// The `CALL_KW` handler's specialization step for the site at `pc` of + /// `code`, calling the plain function `f` with `eff_argc` positionals + /// (a receiver included) and the keyword `names`: an empty site + /// decides, a cooling one counts down, and a specialized one that no + /// longer binds this call cools down. + #[cold] + #[inline(never)] + fn core_specialize_call_kw( + code: &CodeObject, + pc: usize, + f: &Rc, + eff_argc: usize, + names: &[Object], + ) { + use weavepy_compiler::InlineCache as IC; + let kw_op = OpCode::CallKw as u8; + if crate::trace::any_observers_active() + && crate::trace::monitoring_union_mask_cached() + & crate::trace::event_mask(crate::trace::EVENT_CALL) + != 0 + { + return; + } + let at = pc as u32; + match code.caches.get(at) { + IC::Empty => { + specialize::record_specialize_attempt(kw_op); + let decision = specialize::attempt_specialize_call_kw_names(f, eff_argc, names); + code.caches.set(at, decision); + if matches!(decision, IC::Cooldown(_)) { + specialize::record_specialize_skip(kw_op); + } else { + specialize::record_specialize_success(kw_op); + } + } + IC::Cooldown(n) => { + code.caches.set( + at, + if n > 0 { + IC::Cooldown(n - 1) + } else { + IC::Empty + }, + ); + } + IC::CallPyKwNames { + func_id, + perm, + argc, + kwc, + } => { + let binds = argc as usize == eff_argc + && kwc as usize == names.len() + && Self::kw_names_bind_check(f, func_id, perm, names, eff_argc).is_some(); + if !binds { + specialize::record_miss(kw_op); + code.caches.set(at, IC::Cooldown(COOLDOWN)); + } + } + _ => {} + } + } + /// `FOR_ITER` at the running activation's pc over a native adapter /// (`map`, `filter`, an `itertools` object) whose step can run Python /// code (`map(f, xs)` with a Python `f`): the step runs through the @@ -16384,9 +17561,50 @@ impl Interpreter { else { return false; }; + // A class whose metaclass replaces `__call__` with a plain Python + // function (`EnumType`): the call is that function's, with the + // class as its receiver. + // SAFETY: see `CoreSwitch`. + if Self::unpack_meta_call(unsafe { &mut *sw.cur }, argc) { + return self.core_call(sw, pc); + } self.core_new_n(sw, pc, argc, snap_gen) } + /// Turn the operands of a call of a class (`argc` positionals, no + /// receiver) whose metaclass's `__call__` resolves to a plain Python + /// function into that function's call with the class as its receiver, + /// as `type(cls).__call__(cls, ...)` binds it (the generic call's + /// `bind_method`). `false` touches nothing. + fn unpack_meta_call(frame: &mut Frame, argc: usize) -> bool { + let n = frame.stack.len(); + let Some(self_slot) = n.checked_sub(argc + 1) else { + return false; + }; + let Some(callee_slot) = self_slot.checked_sub(1) else { + return false; + }; + let Object::Type(ty) = &frame.stack[callee_slot] else { + return false; + }; + if !matches!(frame.stack[self_slot], Object::Unbound) || Self::metaclass_calls_like_type(ty) + { + return false; + } + let Some(meta) = ty.metaclass.borrow().clone() else { + return false; + }; + if meta.flags.is_builtin || meta.c_ext_ptr.get() != 0 { + return false; + } + let Some(call @ Object::Function(_)) = meta.lookup("__call__") else { + return false; + }; + let cls = std::mem::replace(&mut frame.stack[callee_slot], call); + frame.stack[self_slot] = cls; + true + } + /// `cls(*args)` (the `CALL_FUNCTION_EX` at `pc` of `sw`'s synced /// running activation) of a plain class over an exact tuple or list, /// with no keywords: the items spread into a call's operands for @@ -16434,6 +17652,135 @@ impl Interpreter { false } + /// `cls(..., name=value)` (the `CALL_KW` at `pc` of `sw`'s synced + /// running activation) of a plain class whose `__init__` a lean + /// activation can run: the arguments bind by name as the generic + /// binder would (see [`Self::lean_bind_keywords`]), and the `__init__` + /// activation runs inline as [`Self::core_new_n`]'s does. `false` + /// touches nothing. + #[inline(never)] + fn core_new_kw(&mut self, sw: &mut CoreSwitch, pc: usize, snap_gen: u64) -> bool { + if !self.inline_calls_ok() + || crate::stdlib::tracemalloc_real::is_tracking() + || crate::stdlib::testinternalcapi_mod::reftrace_print_active() + || crate::stdlib::testinternalcapi_mod::nomem_alloc_fails() + || self.lean_snapshot() != Some(snap_gen) + { + return false; + } + // SAFETY: see `CoreSwitch`. + let frame = unsafe { &mut *sw.cur }; + let Some(argc) = frame.code.instructions.get(pc).map(|i| i.arg as usize) else { + return false; + }; + let len = frame.stack.len(); + let Some(Object::Tuple(names)) = frame.stack.last() else { + return false; + }; + let kwc = names.len(); + // Stack: class, self-or-null, positionals, keyword values, names. + let Some(callee_slot) = len.checked_sub(kwc + argc + 3) else { + return false; + }; + let Object::Type(ty) = &frame.stack[callee_slot] else { + return false; + }; + if !matches!(frame.stack[callee_slot + 1], Object::Unbound) + || ty.flags.is_builtin + || ty.native_kind.get() != 0 + || !Self::metaclass_calls_like_type(ty) + { + return false; + } + let ty = ty.clone(); + let plan = self.instance_plan(&ty); + if plan.seeds_exception_args { + return false; + } + let Some((init, code)) = plan.lean_init.as_ref() else { + return false; + }; + // SAFETY: GIL-serialized raw read of the function's code cell; + // only the pointer is compared. + if !std::ptr::eq( + unsafe { Rc::as_ptr(&*init.code.as_ptr()) }, + Rc::as_ptr(code), + ) || !Self::lean_code_ok(code) + // The instance binds to the first positional parameter. + || code.arg_count == 0 + || (init.defaults_maybe_overridden() + && (init.slot("__defaults__").is_some() || init.slot("__kwdefaults__").is_some())) + { + return false; + } + let Some(cells) = init.lean_cells_ref(code) else { + return false; + }; + let cells: *const Rc>>> = cells; + let act = self.inline_slot(); + // SAFETY: a parked slot's locals storage is its own, and empty. + let locals = unsafe { &mut *act.frame.locals.as_ptr() }; + // (The instance isn't made until the binding holds: `None` keeps + // its parameter's place.) + let receiver = Object::None; + let values = &frame.stack[len - 1 - kwc..len - 1]; + let bound = Self::lean_bind_keywords( + init, + code, + std::iter::once(&receiver).chain(&frame.stack[callee_slot + 2..len - 1 - kwc]), + names.iter().zip(values), + locals, + ); + let guard = match (bound, crate::recursion::enter_with(sw.depth_cell)) { + (Some(()), crate::recursion::Enter::Ok(guard)) => guard, + _ => { + locals.clear(); + self.inline_unslot(act); + return false; + } + }; + // Committed. + let (init, code) = (init.clone(), code.clone()); + let (inst, tracked) = self.alloc_lean_instance_obj(&ty, &plan.native); + drop(plan); + locals[0] = inst.clone(); + if tracked && gc_trace::maybe_auto_collect() { + self.run_pending_finalizers(); + } + // SAFETY: as above (finalizers ran against the synced frame). + let frame = unsafe { &mut *sw.cur }; + // The operands leave the stack, as the full call handler releases + // them once the parameters are bound. + self.release_call_operands(&mut frame.stack, callee_slot); + drop(ty); + fill_unbound(locals, code.varnames.len()); + frame.pc = pc as u32 + 1; + let mut tmp = None; + // SAFETY: see `CoreSwitch`. + let mut act = unsafe { + let depth = (*sw.inl).len(); + let (frame, _, shell) = sw.activation(depth, &mut tmp); + self.inline_bind_cells( + &mut *frame, + &mut *shell.cast::>(), + pc, + act, + code, + Object::Function(init), + guard, + cells, + ) + }; + act.init_inst = Some(inst); + let callee: *mut Frame = &raw mut *act.frame; + // SAFETY: as above. + unsafe { push_fast(&mut *sw.inl, act) }; + sw.cur = callee; + sw.scratch = usize::MAX; + sw.last = &raw mut sw.scratch; + true + } + /// [`Self::core_new`] of the class `argc` positional arguments below /// the top of the stack, called by the instruction at `pc`. fn core_new_n(&mut self, sw: &mut CoreSwitch, pc: usize, argc: usize, snap_gen: u64) -> bool { @@ -16467,6 +17814,80 @@ impl Interpreter { { return false; } + // `C()` of a class whose memoized plan is the bare allocation: the + // class moves off the stack (the self slot owns nothing) and the + // instance takes its place. + if argc == 0 + && ty.native_kind.get() == 0 + // SAFETY: a guard-free read of the memoized plan; nothing runs + // before its last use. + && unsafe { ty.instance_plan.peek() } + .and_then(Option::as_ref) + .is_some_and(|(v, plan)| *v == ty.attr_version.get() && plan.bare_alloc) + { + // SAFETY: the class's slot is initialized and leaves the stack + // with the (`Unbound`) self slot, which has no drop glue. + let ty = unsafe { + let ty = frame.stack.as_ptr().add(callee_slot).read(); + frame.stack.set_len(callee_slot); + ty + }; + let Object::Type(cls) = &ty else { + unreachable!("checked above") + }; + let (inst, tracked) = self.alloc_plain_instance_obj(cls); + frame.stack.push(inst); + frame.pc = pc as u32 + 1; + drop(ty); + if tracked && gc_trace::maybe_auto_collect() { + self.run_pending_finalizers(); + } + return true; + } + // A class whose construction its plan proved to be a store-only + // `__init__`'s stores (see `core_store_init`). + // SAFETY: as above. + let proven = unsafe { ty.instance_plan.peek() } + .and_then(Option::as_ref) + .filter(|(v, plan)| { + *v == ty.attr_version.get() + && plan.store_init.load(std::sync::atomic::Ordering::Relaxed) == 1 + }) + .and_then(|(_, plan)| { + let (init, code) = plan.lean_init.as_ref()?; + // SAFETY: GIL-serialized raw read of the function's code + // cell; only the pointer is compared. + let same = std::ptr::eq( + unsafe { Rc::as_ptr(&*init.code.as_ptr()) }, + Rc::as_ptr(code), + ); + let missing = Self::missing_defaults(init, code, argc + 1).filter(|_| same)?; + Some((ty.clone(), plan.clone(), missing)) + }); + if let Some((ty, plan, missing)) = proven { + let (init, code) = plan.lean_init.as_ref().expect("checked above"); + if self.core_store_init( + frame, + &ty, + &plan, + init, + code, + false, + argc, + missing, + self_slot, + callee_slot, + sw.depth_cell, + ) { + frame.pc = pc as u32 + 1; + return true; + } + } + // SAFETY: as above. + let frame = unsafe { &mut *sw.cur }; + let Object::Type(ty) = &frame.stack[callee_slot] else { + return false; + }; let ty = ty.clone(); let plan = self.instance_plan(&ty); // A named tuple: the tuple of the arguments is the whole call (see @@ -16511,19 +17932,7 @@ impl Interpreter { } // `C()` for a class with the default `__new__` and // `object.__init__`: the allocation is the whole call. - if argc == 0 - && plan.is_object_new - && plan.init_from_object - && plan.user_new.is_none() - && plan.abstract_error.is_none() - && !plan.seeds_exception_args - && matches!(plan.native, crate::types::NativeKind::Plain) - && ty.native_kind.get() == 0 - { - let bt = builtin_types(); - if ty.is_subclass_of(&bt.module_) || ty.is_subclass_of(&bt.generic_alias_) { - return false; - } + if argc == 0 && plan.bare_alloc && ty.native_kind.get() == 0 { let (inst, tracked) = self.alloc_plain_instance_obj(&ty); frame.stack.truncate(callee_slot); frame.stack.push(inst); @@ -16549,6 +17958,27 @@ impl Interpreter { let Some(missing) = Self::lean_init_missing(init, code, argc + 1) else { return false; }; + // A store-only `__init__`: the stores themselves, as its sites + // last proved them. + if matches!(plan.native, crate::types::NativeKind::Plain) + && !plan.seeds_exception_args + && self.core_store_init( + frame, + &ty, + &plan, + init, + code, + true, + argc, + missing, + self_slot, + callee_slot, + sw.depth_cell, + ) + { + frame.pc = pc as u32 + 1; + return true; + } // A leaf `__init__` (plain stores of its arguments into `self`) // runs frameless, as a leaf method call does (a plain instance // only). @@ -16641,6 +18071,263 @@ impl Interpreter { /// unused instance was never seen). #[inline(never)] #[allow(clippy::too_many_arguments)] + /// [`Self::core_new`] for a store-only `__init__` (see + /// [`code_store_init`]): a fresh instance takes the arguments (or + /// constants) straight into its split values, in the order the + /// class's shared names hold them, when every store's site last + /// stored there for the class's current version (which proves the + /// store a plain `__dict__` one, see `core_store_new_attr`). The + /// arguments the stores don't take are released. `false` touches + /// nothing. + /// + /// With `prove`, the stores prove (or disprove) the shape, which the + /// class's `plan` records; without, the plan proved it. A laid-out + /// class's member positions are proved once per plan. + #[allow(clippy::too_many_arguments)] + fn core_store_init( + &self, + frame: &mut Frame, + ty: &Rc, + plan: &crate::types::InstancePlan, + init: &Rc, + code: &Rc, + prove: bool, + argc: usize, + missing: usize, + self_slot: usize, + callee_slot: usize, + depth_cell: *const std::cell::Cell, + ) -> bool { + let Some(shape) = code_store_init(code) else { + return false; + }; + let Some(slots) = code_vm_ext(code) + .filter(|e| e.field_slots.is_allocated()) + .map(|e| e.field_slots.view()) + else { + return false; + }; + let ver = ty.attr_version.get(); + if argc + 1 + missing != code.arg_count as usize + || ty.flags.is_builtin + || ty.native_kind.get() != 0 + || ty.instances_need_finalize() + || crate::capi_watchers::dicts_active() + || crate::gil::free_threading_enabled() + // The ordinary call's `RecursionError` check. + // SAFETY: this thread's own depth cell. + || unsafe { (*depth_cell).get() } >= crate::recursion::recursion_limit() + { + return false; + } + // A class that lays its `__slots__` members out: each store's site + // must have last stored a distinct member of this class version's + // instances (sites another version recorded say nothing), whose + // layout positions the stores then fill. A site that recorded + // anything else for this version never will. + let proving = prove.then_some(&plan.store_init); + let laid_out = ty.slot_layout.get().and_then(Option::as_ref); + let mut members = [0u8; crate::inst_dict::SHARED_KEYS_CAP]; + let n = shape.stores.len(); + if let (Some(_), Some(proved)) = (laid_out, plan.slot_members.get()) { + members[..n].copy_from_slice(proved); + } else if laid_out.is_some() { + let mut seen = 0u64; + for (k, &(pc, _)) in shape.stores.iter().enumerate() { + match slots.get(pc as usize).map(FieldSlot::get) { + Some((v, idx)) + if v == ver + && idx & SLOT_FIELD != 0 + && (idx & !SLOT_FIELD) < 64 + && seen & (1 << (idx & !SLOT_FIELD)) == 0 => + { + let i = idx & !SLOT_FIELD; + seen |= 1 << i; + members[k] = i as u8; + } + Some((v, _)) if v == ver => { + if let Some(proving) = proving { + proving.store(2, std::sync::atomic::Ordering::Relaxed); + } + return false; + } + _ => return false, + } + } + // (The positions hold for this class version: its plan's.) + let _ = plan.slot_members.set(members[..n].into()); + } else if let Some(proving) = proving { + // Every store's site must have last stored the next position + // of this class version's instances. A site proven for another + // position never will be; one that hasn't stored for this + // version yet may still. + for (k, &(pc, _)) in shape.stores.iter().enumerate() { + match slots.get(pc as usize).map(FieldSlot::get) { + Some((v, idx)) if v == ver && idx == k as u32 => {} + Some((v, _)) if v == ver => { + proving.store(2, std::sync::atomic::Ordering::Relaxed); + return false; + } + _ => return false, + } + } + } + let consts = code_vm_ext(code).map_or(&[][..], |e| &e.objects[..]); + if shape + .stores + .iter() + .any(|&(_, src)| matches!(src, StoreSrc::Const(c) if c as usize >= consts.len())) + { + return false; + } + let keys = match laid_out { + Some(_) => None, + None => match ty.shared_keys.get() { + Some(keys) if keys.len() >= shape.stores.len() => Some(keys), + _ => return false, + }, + }; + // Committed. + let (inst, _) = self.alloc_plain_instance_obj(ty); + let Object::Instance(i) = &inst else { + unreachable!("a plain class's instance") + }; + if let Some(keys) = keys { + // SAFETY: the instance is fresh and unshared. + if let Some(split) = unsafe { i.dict.split_cell().peek_mut() } { + split.reserve_for(|| ty.shared_keys.share(), keys.len()); + } + } + // The parameters: the instance, the arguments (moved out of the + // stack on their last use), then the defaults. + let args = self_slot + 1; + let mut left = [0u8; 8]; + left[..shape.uses.len()].copy_from_slice(&shape.uses); + let defaults = &init.defaults[init.defaults.len() - missing..]; + // A split instance's values, all computed, go down in one pass. + let mut split_vals = [const { std::mem::MaybeUninit::::uninit() }; + crate::inst_dict::SHARED_KEYS_CAP]; + for (k, &(_, src)) in shape.stores.iter().enumerate() { + let value = match src { + StoreSrc::Param(0) => inst.clone(), + StoreSrc::Param(j) => { + let j = j as usize; + left[j] -= 1; + if j <= argc { + let slot = &mut frame.stack[args + j - 1]; + if left[j] == 0 { + std::mem::replace(slot, Object::Unbound) + } else { + slot.clone() + } + } else { + defaults[j - argc - 1].clone() + } + } + StoreSrc::Const(c) => consts[c as usize].clone(), + StoreSrc::Int(n) => Object::Int(n), + }; + split_vals[k].write(value); + } + if let Some(layout) = laid_out { + // SAFETY: the first `n` entries were written above; each is + // read exactly once, below. + let vals = unsafe { + std::slice::from_raw_parts_mut(split_vals.as_mut_ptr().cast::(), n) + }; + // The write barrier once (`note_slot_store`'s), then each value + // into its member's place through one borrow. + if !vals.iter().all(Object::is_gc_atomic) { + i.ensure_gc_tracked(); + } + // SAFETY: the instance is fresh and unshared; its slots were + // laid out over its class's layout at allocation. + match unsafe { i.slots.peek_mut() }.and_then(|s| s.values_for_layout_mut(layout)) { + Some(places) if members[..n].iter().all(|&m| usize::from(m) < places.len()) => { + for (v, &m) in vals[..n].iter().zip(&members[..n]) { + // SAFETY: as above. + let value = unsafe { std::ptr::read(v) }; + drop(std::mem::replace(&mut places[usize::from(m)], value)); + } + } + _ => { + // (Unreachable for a fresh instance; the plain stores + // keep it correct regardless.) + for (v, store) in vals[..n].iter().zip(&shape.stores[..n]) { + // SAFETY: as above. + let value = unsafe { std::ptr::read(v) }; + let at = code.instructions[store.0 as usize].arg; + if let Some(name) = code.names.get(at as usize) { + i.slot_set(name, value); + } + } + } + } + } + if let Some(keys) = keys { + // SAFETY: the first `n` entries were written above; each is + // read exactly once, by the fill or by the stores after it. + let vals = unsafe { + std::slice::from_raw_parts_mut(split_vals.as_mut_ptr().cast::(), n) + }; + // The write barrier, once, before the values are viewed. + if i.deferred.get() && !vals.iter().all(Object::is_gc_atomic) { + i.ensure_gc_tracked(); + } + // (A recycled instance may carry a published, empty `__dict__`, + // which then holds its attributes instead.) + // SAFETY: the instance is fresh and unshared. + let filled = i.c_body.get() == 0 + && !crate::gil::free_threading_enabled() + && unsafe { i.dict.split_peek_mut() }.is_some_and(|split| { + let at = vals.as_ptr(); + // SAFETY: as above. + split.fill_fresh( + keys, + || ty.shared_keys.share(), + n, + |k| unsafe { at.add(k).read() }, + ) + }); + if !filled { + for (k, v) in vals[..n].iter().enumerate() { + // SAFETY: as above. + let value = unsafe { std::ptr::read(v) }; + // SAFETY: a store with nothing else running; the + // positions are the instance's next ones (proved above). + if let Err(value) = unsafe { i.split_append(k, value) } { + // (Unreachable for a fresh instance over its class's + // names; the plain store keeps it correct regardless.) + let at = code.instructions[shape.stores[k].0 as usize].arg; + if let Some(name) = code_name_obj(code, at) { + i.dict_shared() + .borrow_mut() + .insert(DictKey(name.clone()), value); + } + } + } + } + } + // The class, the self slot and the arguments the stores left. + // SAFETY: the operands leave the stack, each released once. + unsafe { + let base = frame.stack.as_ptr(); + let n = frame.stack.len(); + frame.stack.set_len(callee_slot); + for k in callee_slot..n { + let o = base.add(k).read(); + if !matches!(o, Object::Unbound) { + self.release(o); + } + } + } + frame.stack.push(inst); + if let Some(proving) = proving { + proving.store(1, std::sync::atomic::Ordering::Relaxed); + } + true + } + fn core_leaf_init( &self, frame: &mut Frame, @@ -16669,10 +18356,7 @@ impl Interpreter { } // The arguments leave by plain decrements (whatever `__init__` // stored holds its own reference). - if !frame.stack[self_slot + 1..] - .iter() - .all(Self::core_droppable) - { + if !Self::core_all_droppable(&frame.stack[self_slot + 1..]) { return false; } let (inst, _) = self.alloc_plain_instance_obj(ty); @@ -16801,9 +18485,8 @@ impl Interpreter { } /// An `except` clause's `PUSH_EXC_INFO`, `CHECK_EXC_MATCH` or - /// `POP_EXCEPT` (`ins`) of a frame (its handler state `exc`) over the - /// `len` stack slots at `base` - /// (room to `cap`), as the full handlers run their common shapes: an + /// `POP_EXCEPT` (`ins`) over the `len` stack slots at `base` (room to + /// `cap`), as the full handlers run their common shapes: an /// exception instance on entry, class operands that are /// `BaseException` subclasses. Returns the new stack length, or /// `None`, having touched nothing. A `POP_EXCEPT`'s releases may queue @@ -16816,7 +18499,6 @@ impl Interpreter { #[inline(never)] unsafe fn core_exc_op( &mut self, - exc: &mut Option>, ins: weavepy_compiler::Instruction, base: *mut Object, len: usize, @@ -16833,11 +18515,12 @@ impl Interpreter { } // SAFETY: as above. let instance = unsafe { &*base.add(len - 1) }.clone(); - let prev = self - .exc_info_stack - .borrow() - .last() - .map_or(Object::None, |pe| pe.instance.clone()); + let prev = { + let mut handled = self.exc_info_stack.borrow_mut(); + let prev = handled.last().cloned().unwrap_or(Object::None); + handled.push(instance); + prev + }; // SAFETY: the exception moves up one slot and the previous // one takes its place (`len < cap`). unsafe { @@ -16845,11 +18528,6 @@ impl Interpreter { base.add(len - 1).write(prev); base.add(len).write(top); } - let pe = PyException::new(instance); - exc.get_or_insert_with(Box::default) - .handlers - .push((ins.arg, pe.clone())); - self.exc_info_stack.borrow_mut().push(pe); Some(len + 1) } OpCode::CheckExcMatch => { @@ -16873,14 +18551,11 @@ impl Interpreter { } // SAFETY: the slot at `len - 1` is initialized. let prev = unsafe { base.add(len - 1).read() }; - let popped = exc.as_mut().and_then(|e| e.handlers.pop()); let top = self.exc_info_stack.borrow_mut().pop(); // See the full handler: the handled exception dies here // unless something else holds it. - self.recheck_frame_observed = true; - drop(top); - if let Some((_, pe)) = popped { - self.release(pe.instance); + if let Some(top) = top { + self.release(top); } self.release(prev); Some(len - 1) @@ -16889,6 +18564,77 @@ impl Interpreter { } } + /// `del obj.attr` (`DELETE_ATTR` `ins` of `code`) of the instance atop + /// the `len` stack slots at `base`, as the full leaf arm runs it: an + /// ordinary instance's own attribute, by the default `__delattr__`, + /// with no class attribute of that name. The value and the instance + /// leave as the full arm releases them (which may queue a finalizer: + /// the caller checks). Returns the new stack length, or `None`, having + /// touched nothing (a missing attribute raises through the full arm). + /// + /// # Safety + /// + /// The `len` slots at `base` are initialized operand stack entries. + #[inline(never)] + unsafe fn core_delete_attr( + &mut self, + code: &CodeObject, + ins: weavepy_compiler::Instruction, + pc: usize, + base: *mut Object, + len: usize, + ) -> Option { + if len == 0 { + return None; + } + // SAFETY: `len > 0`. + let Object::Instance(inst) = (unsafe { &*base.add(len - 1) }) else { + return None; + }; + let Some(Object::Str(key)) = code_name_obj(code, ins.arg) else { + return None; + }; + let cls = inst.cls_raw(); + // (The full arm's conditions; see there.) + if inst.native.get().is_some() || crate::capi_watchers::dicts_active() { + return None; + } + // The rest depend on the name and the class alone, settled once + // per class version at the site (versions are process-unique). + let ver = cls.attr_version.get(); + let stamp = code_stamp_slot(code, pc as u32); + if !stamp.is_some_and(|s| s.get() == [ver, DELETE_OWN_ATTR, 0]) { + if key.starts_with("__") + || &**key == "_CHUNK_SIZE" + || cls.flags.is_exception + || cls.forbids_dict + || !Self::default_delattr(cls) + || !matches!( + Self::leaf_class_attr(code, cls, ins.arg), + Some(LeafAttr::InstanceOnly) + ) + { + return None; + } + if let Some(s) = stamp { + s.set([ver, DELETE_OWN_ATTR, 0]); + } + } + let removed = match inst.split_remove(key) { + Some(removed) => removed?, + None => inst + .dict_cell() + .borrow_mut() + .shift_remove(&DictKey(Object::Str(key.clone())))?, + }; + // SAFETY: the instance leaves its slot. + let owner = unsafe { base.add(len - 1).read() }; + // Released at once, as CPython's decref is. + self.release(removed); + self.release(owner); + Some(len - 1) + } + /// Zero-argument `super().name` (`LOAD_SUPER_ATTR` `ins` at `pc` over /// the `len` stack slots at `base`; top-down: self, class, the `super` /// global) of a plain method later in the receiver's MRO, in the @@ -16906,7 +18652,8 @@ impl Interpreter { base: *mut Object, len: usize, ) -> Option { - if ins.arg & 2 != 0 || len < 3 { + // (Either form; see `load_super_attr_direct`.) + if len < 3 { return None; } // SAFETY: `len >= 3`. @@ -16974,12 +18721,25 @@ impl Interpreter { // grades its own release.) if !matches!( c, - Object::List(_) | Object::Tuple(_) | Object::Dict(_) | Object::Str(_) + Object::List(_) + | Object::Tuple(_) + | Object::Dict(_) + | Object::Str(_) + | Object::MappingProxy(_) ) || !Self::core_droppable(c) { return None; } let r = match (c, k) { + // A class's `__dict__` view (`type.__dict__['__mro__']`, + // as `inspect` reads it): a present key's value (a miss + // raises on the full path). + (Object::MappingProxy(d), Object::Str(_)) => { + let probe = crate::object::LeafProbe::new(k)?; + // SAFETY: as for a dict below. + let d = unsafe { d.peek() }?; + clone_hot(d.get_hot(&probe)?) + } (Object::List(xs), Object::Int(i)) => { // SAFETY: a read between two instructions. let xs = unsafe { xs.peek() }?; @@ -17005,7 +18765,7 @@ impl Interpreter { // SAFETY: a read between two instructions (the // probe runs no code). let d = unsafe { d.peek() }?; - clone_hot(d.get(&probe)?) + clone_hot(d.get_hot(&probe)?) } // A string's code point (`str_char_at` byte-indexes an // ASCII string and walks any other from its cursor). @@ -17117,8 +18877,9 @@ impl Interpreter { // SAFETY: as above (the probe and the insert run // no code). let d = unsafe { cell.peek_mut() }?; - let (old, changed) = match d.get_mut(&probe) { - Some(slot) => { + let (old, changed) = match d.probe_entry(&probe) { + crate::dictmap::ProbeEntry::Occupied(e) => { + let slot = e.into_mut(); if !displaced_ok(slot) { return None; } @@ -17128,12 +18889,12 @@ impl Interpreter { let changed = !old.is_same(slot); (old, changed) } - None => { + crate::dictmap::ProbeEntry::Vacant(e) => { if !probe.miss_is_exact() { return None; } // SAFETY: as above. - d.insert(DictKey(clone_hot(k)), unsafe { + e.insert(DictKey(clone_hot(k)), unsafe { base.add(len - 3).read() }); (Object::None, true) @@ -17421,8 +19182,9 @@ impl Interpreter { // SAFETY: as above. let d = unsafe { cell.peek_mut() }?; let (k, v) = (base.wrapping_add(len - 2), base.wrapping_add(len - 1)); - match d.get_mut(&probe) { - Some(slot) => { + match d.probe_entry(&probe) { + crate::dictmap::ProbeEntry::Occupied(e) => { + let slot = e.into_mut(); if !Self::core_droppable(slot) || !Self::core_droppable(key) { return None; } @@ -17434,11 +19196,11 @@ impl Interpreter { drop_hot(k.read()); } } - None if probe.miss_is_exact() => { + crate::dictmap::ProbeEntry::Vacant(e) if probe.miss_is_exact() => { // SAFETY: as above. - unsafe { d.insert(DictKey(k.read()), v.read()) }; + unsafe { e.insert(DictKey(k.read()), v.read()) }; } - None => return None, + crate::dictmap::ProbeEntry::Vacant(_) => return None, } } _ => return None, @@ -17595,20 +19357,37 @@ impl Interpreter { /// /// `top` is the core loop's top stack slot (an instance), and the slot /// above it is free. + /// + /// The site at `pc` remembers the value's split position for the + /// receiver's class (see [`FieldSlot`]), as an instance-field + /// `LOAD_ATTR` does, so later loads skip the resolution. #[inline(never)] pub(crate) unsafe fn core_value_method( code: &CodeObject, name_idx: u32, + pc: usize, top: *mut Object, ) -> bool { // SAFETY: the caller's contract. let Object::Instance(inst) = (unsafe { &*top }) else { return false; }; - let Some((LeafAttr::Value(v), _)) = - Self::leaf_resolve_instance_attr_ix(code, inst, name_idx) - else { - return false; + let ext = code_vm_ext(code); + // SAFETY: a read between two instructions (see `GilCell::peek`). + let held = ext.and_then(|e| unsafe { field_slot_hit(e, pc, inst) }); + let v = match held { + Some(v) => Self::clone_operand(v), + None => { + let Some((LeafAttr::Value(v), ix)) = + Self::leaf_resolve_instance_attr_ix(code, inst, name_idx) + else { + return false; + }; + if let (Some(ext), Some(ix), None) = (ext, ix, inst.dict.published()) { + field_slot_note(ext, code, pc, inst, ix); + } + v + } }; // SAFETY: as above. if !Self::core_droppable(unsafe { &*top }) { @@ -17756,13 +19535,19 @@ impl Interpreter { /// /// `top` is the core loop's top stack slot. #[inline(never)] - unsafe fn core_plain_attr(&self, code: &CodeObject, name_idx: u32, top: *mut Object) -> bool { + unsafe fn core_plain_attr( + &self, + code: &CodeObject, + name_idx: u32, + top: *mut Object, + running: (*const (), u32), + ) -> bool { // SAFETY: the caller's contract. let recv = unsafe { &*top }; if !Self::core_droppable(recv) { return false; } - let Some(v) = self.leaf_plain_attr_value(code, Some(recv), name_idx) else { + let Some(v) = self.leaf_plain_attr_value(code, Some(recv), name_idx, Some(running)) else { return false; }; // SAFETY: the receiver (droppable) is replaced in place. @@ -17890,7 +19675,18 @@ impl Interpreter { let Object::Function(f) = (unsafe { &*top }) else { return false; }; - let Some(v) = Self::leaf_function_read(code, f, name_idx) else { + // A plain name (no `function` descriptor is one) is the + // `__dict__` entry, probed with the name's interned bytes and + // stored hash; anything else, or a cell in use, takes the full read. + let plain = code_name_key(code, name_idx) + .filter(|key| !key.s.starts_with("__") && !crate::object::exotic_str_keys_possible()) + .and_then(|key| { + // SAFETY: reads between two instructions, running no code; + // the views end with the value's clone. + let attrs = unsafe { f.attrs.peek() }?.as_ref()?; + unsafe { attrs.peek() }?.get(&key).map(Self::clone_operand) + }); + let Some(v) = plain.or_else(|| Self::leaf_function_read(code, f, name_idx)) else { return false; }; // SAFETY: as above; the function is held by the variable it was @@ -17923,13 +19719,25 @@ impl Interpreter { { return false; } - let Some(name @ Object::Str(n)) = code_name_obj(code, name_idx) else { + let (Some(name @ Object::Str(n)), Some(key)) = + (code_name_obj(code, name_idx), code_name_key(code, name_idx)) + else { return false; }; if n.starts_with("__") { return false; } - let dict = f.attrs(); + // The existing dictionary in place (no code runs while it is + // read), else a new one. + let made; + // SAFETY: a read of the cell that holds the dictionary. + let dict = match unsafe { f.attrs.peek() } { + Some(Some(d)) => d, + _ => { + made = f.attrs(); + &made + } + }; let old = { let Ok(mut d) = dict.try_borrow_mut() else { return false; @@ -17937,7 +19745,8 @@ impl Interpreter { // SAFETY: the value moves into the dictionary; its slot is // forgotten below. let value = unsafe { std::ptr::read(value) }; - match d.get_mut(&crate::object::StrKey(n)) { + // (Probed with the name's interned bytes and stored hash.) + match d.get_mut(&key) { Some(slot) => Some(std::mem::replace(slot, value)), None => { d.insert(DictKey(name.clone()), value); @@ -17953,14 +19762,71 @@ impl Interpreter { true } + /// `C.name = v` with the class at `recv` and the value below it: a + /// non-dunder name written to a heap class's own dict under `type`'s + /// default `__setattr__` (the plain end of [`Self::set_type_attr_direct`]; + /// a custom metaclass or a type watcher keeps the full path), the + /// class's version advanced, both operands leaving the stack. `false` + /// touches nothing. + /// + /// # Safety + /// + /// `recv` is the core loop's top stack slot, the value the one below. + #[inline(never)] + unsafe fn core_class_store(code: &CodeObject, name_idx: u32, recv: *mut Object) -> bool { + // SAFETY: the caller's contract. + let (Object::Type(cls), value) = (unsafe { &*recv }, unsafe { &*recv.sub(1) }) else { + return false; + }; + if crate::capi_watchers::types_active() + || !Self::core_drops_plain() + || !Self::core_droppable(unsafe { &*recv }) + || cls.flags.is_builtin + || cls.immutable.get() + || cls.c_ext_ptr.get() != 0 + || !Self::plain_metaclass(cls) + { + return false; + } + let Some(name @ Object::Str(n)) = code_name_obj(code, name_idx) else { + return false; + }; + if n.starts_with("__") { + return false; + } + let old = { + let Ok(mut d) = cls.dict.try_borrow_mut() else { + return false; + }; + match d.get_mut(&crate::object::StrKey(n)) { + // (The value it replaces leaves by a plain decrement.) + Some(slot) if !Self::core_droppable(slot) => return false, + // SAFETY: the value moves into the dictionary; its slot is + // forgotten below. + Some(slot) => Some(std::mem::replace(slot, unsafe { std::ptr::read(value) })), + None => { + // SAFETY: as above. + d.insert(DictKey(name.clone()), unsafe { std::ptr::read(value) }); + None + } + } + }; + cls.bump_attr_version(); + // SAFETY: the class leaves by a plain decrement (checked droppable); + // the value's slot moved out above. + unsafe { drop_hot(recv.read()) }; + drop(old); + true + } + /// Whether a release reports to nothing (no dict or function watcher, /// no reference tracing), so a droppable value leaves by a plain /// decrement (see [`Self::core_droppable`]). #[inline(always)] - fn core_drops_plain() -> bool { - !crate::capi_watchers::dicts_active() - && !crate::capi_watchers::funcs_active() - && !crate::stdlib::testinternalcapi_mod::reftrace_print_active() + pub(crate) fn core_drops_plain() -> bool { + // (The dict and function watchers' and the reftrace printer's + // flags, tested with one load.) + crate::sync::release_gates() & crate::sync::RELEASE_OBSERVER_GATES == 0 } /// [`Self::core_droppable`] for every one of `ops`, with the global @@ -18001,7 +19867,13 @@ impl Interpreter { return crate::stdlib::abc_mod::abc_instance_cached(cls, &inst.cls()) .map(|b| Ok(Object::Bool(b))); } - return ic.is_subclass_of(cls).then_some(Ok(Object::Bool(true))); + if ic.is_subclass_of(cls) { + return Some(Ok(Object::Bool(true))); + } + // A miss is final when `__class__` can't answer otherwise (and + // the class isn't `os.PathLike`, whose check is structural). + return (ic.class_attr_is_plain() && !crate::stdlib::os::is_path_like(cls)) + .then_some(Ok(Object::Bool(false))); } // One class, or a flat tuple of them (`isinstance(x, (str, int))` // asks each in turn). @@ -18401,9 +20273,7 @@ impl Interpreter { return None; } let fast = code_vm_ext(code)? - .method_slots - .get()? - .get(pc)? + .method_slot(pc)? .get_native_subscript(cls.attr_version.get(), leaf_builtins::generation())?; #[cfg(test)] NATIVE_SUBSCRIPT_CACHE_HITS.with(|hits| hits.set(hits.get() + 1)); @@ -18425,7 +20295,7 @@ impl Interpreter { recv: &Object, attr_pc: usize, name_idx: u32, - mslots: &[MethodSlot], + mslots: Sites<'_, MethodSlot>, lbase: *const Object, nlocals: usize, consts: &[Object], @@ -18493,7 +20363,7 @@ impl Interpreter { code: &CodeObject, recv: &Object, attr_pc: usize, - mslots: &[MethodSlot], + mslots: Sites<'_, MethodSlot>, lbase: *const Object, nlocals: usize, consts: &[Object], @@ -18593,7 +20463,7 @@ impl Interpreter { recv: &Object, attr_pc: usize, name_idx: u32, - mslots: &[MethodSlot], + mslots: Sites<'_, MethodSlot>, lbase: *const Object, nlocals: usize, consts: &[Object], @@ -18639,14 +20509,15 @@ impl Interpreter { let callee: &Rc = unsafe { &*f.code.as_ptr() }; let ver = cls.attr_version.get(); if nargs + 1 == callee.arg_count as usize { - let held = mslots[attr_pc] + let held = mslots + .get(attr_pc)? .get_held(ver) .filter(|h| std::ptr::eq(Rc::as_ptr(h), fp)); if let (Some(ext), Some(held)) = (code_vm_ext(code), held) { let func = Rc::downgrade(&held); leaf_site_set( ext, - code.instructions.len(), + code, attr_pc, Some(LeafSiteData { ver, @@ -18720,7 +20591,7 @@ impl Interpreter { let r = self.pure_leaf_call(code_rc, f, &args[..total], effect, depth); let Some(v) = r else { if let Some(ext) = code_vm_ext(code) { - leaf_site_set(ext, code.instructions.len(), attr_pc, None); + leaf_site_set(ext, code, attr_pc, None); } return SiteCall::Missed; }; @@ -18853,7 +20724,7 @@ impl Interpreter { let id = Rc::as_ptr(instance) as usize as u64; eprintln!("First predicate instance drop miss: owners={}, deferred={}, maybe_tracked={}, tracked={}, weakrefs={}", Rc::strong_count(instance), instance.is_gc_deferred(), - gc_trace::maybe_tracked(id), gc_trace::is_tracked(id), + gc_trace::maybe_tracked(id), gc_trace::is_tracked(operand), crate::weakref_registry::may_have_weakrefs(id)); } } @@ -18864,10 +20735,7 @@ impl Interpreter { } } } - if !ops - .iter() - .all(|o| matches!(o, Object::Unbound) || Self::core_droppable(o)) - { + if !Self::core_all_droppable(ops) { return None; } #[cfg(test)] @@ -18893,6 +20761,60 @@ impl Interpreter { self.pure_leaf_call(code_rc, f, &args[..arity], effect, depth) } + /// [`Self::core_pure_call`] for a `CALL` site of the frame JIT that + /// cached its leaf callee (see `frame_jit::leaf_site_call`): the site + /// settled the callee's shape (positional parameters only, at most + /// eight, the last `missing` of them from the defaults), so only the + /// checks that can change from call to call remain. + pub(crate) fn site_leaf_eval( + &self, + ops: &[Object], + missing: usize, + depth_cell: *const std::cell::Cell, + ) -> Option { + let Object::Function(f) = ops.first()? else { + return None; + }; + // SAFETY: GIL-serialized raw read of the function's code cell (see + // `PyFunction::code`), while the caller's stack keeps the function + // alive. + let code_rc: &Rc = unsafe { &*f.code.as_ptr() }; + let pure = code_is_pure_leaf(code_rc); + let effect = !pure && code_is_effect_leaf(code_rc); + if !(pure || effect) || !pure_leaf_warm(code_rc) { + return None; + } + if missing > 0 + && (f.defaults.len() < missing + || (f.defaults_maybe_overridden() && f.slot("__defaults__").is_some())) + { + return None; + } + // The ordinary call's `RecursionError` check. + // SAFETY: this thread's own depth cell. + let depth = unsafe { (*depth_cell).get() }; + if depth >= crate::recursion::recursion_limit() { + return None; + } + if !Self::core_all_droppable(ops) { + return None; + } + let first = if matches!(ops[1], Object::Unbound) { + 2 + } else { + 1 + }; + let nargs = ops.len() - first; + let mut args: [*const Object; 8] = [std::ptr::null(); 8]; + for (k, o) in ops[first..].iter().enumerate() { + args[k] = o; + } + for (k, o) in f.defaults[f.defaults.len() - missing..].iter().enumerate() { + args[nargs + k] = o; + } + self.pure_leaf_call(code_rc, f, &args[..nargs + missing], effect, depth) + } + /// [`Self::core_pure_call`] for a `CALL_KW` at `pc`: `ops` is the /// callee, its self slot, `argc` positionals, the keyword values and /// the names tuple. The site's cached `CallPyKwNames` permutation @@ -18938,10 +20860,7 @@ impl Interpreter { if unsafe { (*depth_cell).get() } >= crate::recursion::recursion_limit() { return None; } - if !ops - .iter() - .all(|o| matches!(o, Object::Unbound) || Self::core_droppable(o)) - { + if !Self::core_all_droppable(ops) { return None; } // Its keyword-only parameters follow the positional ones, then its @@ -19026,7 +20945,7 @@ impl Interpreter { || ck as usize != kwc || vals.len() != eff_argc + kwc || !fn_is_pure_leaf(f) - || !vals.iter().all(Self::core_droppable) + || !Self::core_all_droppable(vals) { return None; } @@ -19140,6 +21059,13 @@ impl Interpreter { use weavepy_compiler::InlineCache as IC; // SAFETY: forwarded contract. if let Some(v) = unsafe { field_slot_hit(ext, cache_pc as usize, inst) } { + #[cfg(test)] + if ext + .field_slot(cache_pc as usize) + .is_some_and(|s| s.get().1 & SLOT_FIELD != 0) + { + note_pure_slot_field_read(code); + } return Some(v); } let names: &[Object] = &ext.name_objs; @@ -19158,13 +21084,7 @@ impl Interpreter { if !slot_name_matches_in(names, code, name_idx, key) { return None; } - field_slot_note( - ext, - code.instructions.len(), - cache_pc as usize, - inst, - key_idx, - ); + field_slot_note(ext, code, cache_pc as usize, inst, key_idx); Some(value) } else { // SAFETY: the same rooted read as the dictionary path. @@ -19173,21 +21093,13 @@ impl Interpreter { .get_index(key_idx as usize) .filter(|(key, _)| slot_name_matches_in(names, code, name_idx, key)) .map(|(_, value)| value); + if indexed.is_some() { + slot_field_note(code, ext, cache_pc as usize, inst, key_idx, name_idx); + } // Slot order can vary by instance or after deletion. let value = indexed.or_else(|| slots.get(code.names.get(name_idx as usize)?))?; #[cfg(test)] - PURE_SLOT_FIELD_READS.with(|hits| { - let mut counts = hits.get(); - let shape = code_vm_ext(code) - .map(|ext| ext.pure_leaf.load(std::sync::atomic::Ordering::Relaxed)); - let index = match shape { - Some(6) => 0, - Some(7) => 1, - _ => 2, - }; - counts[index] += 1; - hits.set(counts); - }); + note_pure_slot_field_read(code); Some(value) } } @@ -19220,8 +21132,9 @@ impl Interpreter { /// [`Self::pure_leaf_eval`] (with `effect`, of an effect leaf) at /// recursion depth `depth`: a warm callee's compiled plan is entered - /// directly (see [`Self::leaf_site_native`]). - #[inline(always)] + /// directly (see [`Self::leaf_site_native`]). The one copy every + /// frameless call path shares: its extension is looked up once. + #[inline(never)] fn pure_leaf_call( &self, code: &CodeObject, @@ -19236,7 +21149,26 @@ impl Interpreter { if bails >= LEAF_BAIL_LIMIT && bails > done { return None; } - let r = self.pure_leaf_call_inner(code, f, args, effect, depth); + let r = 'eval: { + // (The tiny shapes `leaf_eval` answers itself skip the probe.) + #[cfg(feature = "jit")] + if ext.pure_leaf.load(std::sync::atomic::Ordering::Relaxed) < 3 { + let fast = if effect { + self.leaf_site_native::(code, ext, f, args, depth) + } else { + self.leaf_site_native::(code, ext, f, args, depth) + }; + if let Some(r) = fast { + break 'eval r; + } + } + let _ = depth; + if effect { + self.pure_leaf_eval::(code, f, args) + } else { + self.pure_leaf_eval::(code, f, args) + } + }; // (Each half stops counting when full: the counts only steer the // decision above.) let bump = if r.is_some() { 1 } else { 1 << 32 }; @@ -19247,36 +21179,6 @@ impl Interpreter { r } - fn pure_leaf_call_inner( - &self, - code: &CodeObject, - f: &crate::object::PyFunction, - args: &[*const Object], - effect: bool, - depth: usize, - ) -> Option { - // (The tiny shapes `leaf_eval` answers itself skip the probe.) - #[cfg(feature = "jit")] - if code_vm_ext(code) - .is_some_and(|e| e.pure_leaf.load(std::sync::atomic::Ordering::Relaxed) < 3) - { - let fast = if effect { - self.leaf_site_native::(code, f, args, depth) - } else { - self.leaf_site_native::(code, f, args, depth) - }; - if let Some(r) = fast { - return r; - } - } - let _ = depth; - if effect { - self.pure_leaf_eval::(code, f, args) - } else { - self.pure_leaf_eval::(code, f, args) - } - } - /// [`Self::pure_leaf_eval`] for a constructor's leaf `__init__` on the /// fresh instance `args[0]` (see `leaf_run`'s `FRESH`): `None` may /// leave that instance half-initialized, for the caller to discard. @@ -19526,7 +21428,18 @@ impl Interpreter { } } }, - _ => { + // A generator suspended in a `yield from` collapses its chain + // as a `SEND` to it would (see `Self::core_iter_collapse`). + InlineResume::ForIter + | InlineResume::NextCall + | InlineResume::NextDefault + | InlineResume::SendCall => { + // SAFETY: see `CoreSwitch`: the running activation is synced. + if Self::iter_may_collapse(unsafe { &*sw.cur }, mode) + && self.core_iter_collapse(sw, pc, mode) == SendHop::Collapsed + { + return true; + } if !self.core_gen_resume_one(sw, pc, mode) { return false; } @@ -19555,6 +21468,128 @@ impl Interpreter { true } + /// Whether the generator a `FOR_ITER`, `next()` or `send(None)` call + /// (`mode`) atop `frame`'s stack resumes is a collapsed chain's level + /// or suspended in a `yield from` (see [`Self::core_iter_collapse`]): + /// a cheap first look, so most generators skip that call. + #[inline(always)] + fn iter_may_collapse(frame: &Frame, mode: InlineResume) -> bool { + let Some(g) = Self::resumed_gen(frame, mode) else { + return false; + }; + if g.chain.get() != 0 { + return true; + } + // SAFETY: a read between instructions; the view ends here. + match unsafe { g.state_raw().peek() } { + Some(GeneratorState::Suspended(gf)) => { + yield_from_resend(&gf.code.instructions, gf.pc as usize).is_some() + } + _ => false, + } + } + + /// [`Self::core_gen_resume`]'s `FOR_ITER` or `next()` (`mode`) at `pc` + /// of a generator suspended in a `yield from`: the generator becomes + /// the outermost level of a collapsed chain, as the delegate of a + /// `SEND` does (see [`Self::core_send_collapse`]), or resumes its + /// parked one. Anything else is declined, touching nothing. + #[inline(never)] + fn core_iter_collapse( + &mut self, + sw: &mut CoreSwitch, + pc: usize, + mode: InlineResume, + ) -> SendHop { + // SAFETY: see `CoreSwitch`: the running activation is synced, the + // generator where `mode` puts it (checked by the caller). + let frame = unsafe { &*sw.cur }; + let Some(g) = Self::resumed_gen(frame, mode) else { + return SendHop::Declined; + }; + if g.chain.get() != 0 { + return match Self::parked_head(g) { + Some(addr) => self.core_send_unpark(sw, pc, mode, addr), + None => SendHop::Declined, + }; + } + let Some(gf) = Self::collapse_frame(g) else { + return SendHop::Declined; + }; + // SAFETY: suspended (checked): a read between instructions. + let Some((next, next_send)) = Self::collapse_next(unsafe { &*gf }) else { + return SendHop::Declined; + }; + // A simple delegate takes a fast step (see `Self::delegate_step`). + if gen_fast::may_step(next) { + let next: *const Rc = next; + // SAFETY: `next` lives on `g`'s stack, which the step leaves. + if let Some(hop) = self.delegate_step(sw, pc, mode, gf, unsafe { &*next }, next_send) { + return hop; + } + } + // Its delegate heads a parked chain: the generator joins it. + if let Some(addr) = Self::parked_head(next) { + // SAFETY: `g` is suspended in a `yield from` of the chain's + // outermost level (checked). + unsafe { Self::collapse_prepend(addr, Rc::as_ptr(g), gf, next_send) }; + return self.core_send_unpark(sw, pc, mode, addr); + } + let Some(next_frame) = Self::collapse_frame(next) else { + return SendHop::Declined; + }; + let next: *const Rc = next; + // SAFETY: `next` lives on `g`'s stack, which nothing changes before + // the walk reads it. + if self.core_send_collapse( + sw, + pc, + mode, + Rc::as_ptr(g), + gf, + unsafe { &*next }, + next_send, + next_frame, + ) { + SendHop::Collapsed + } else { + SendHop::Declined + } + } + + /// The generator a `FOR_ITER`, `next()` or `send(None)` call (`mode`) + /// atop `frame`'s stack resumes, if a collapsed chain may take it. + #[inline(always)] + fn resumed_gen(frame: &Frame, mode: InlineResume) -> Option<&Rc> { + let stack = &frame.stack; + let n = stack.len(); + match mode { + InlineResume::ForIter | InlineResume::NextCall => match stack.last()? { + Object::Generator(g) => Some(g), + _ => None, + }, + InlineResume::NextDefault => match stack.get(n.checked_sub(2)?)? { + Object::Generator(g) => Some(g), + _ => None, + }, + // `gen.send(None)` / `coro.send(None)` (see `try_inline_gen`). + InlineResume::SendCall => { + if !matches!(stack.last()?, Object::None) { + return None; + } + match (stack.get(n.checked_sub(3)?)?, &stack[n - 2]) { + (Object::BoundMethod(bm), Object::Unbound) => match &bm.receiver { + Object::Generator(g) | Object::Coroutine(g) => Some(g), + _ => None, + }, + (_, Object::Generator(g) | Object::Coroutine(g)) => Some(g), + _ => None, + } + } + InlineResume::Send => None, + } + } + /// One level of [`Self::core_gen_resume`]'s `yield from` chain: the /// running generator activation's `SEND` at `send_pc` to the suspended /// generator under its sent value, as [`Self::try_inline_gen`] resumes @@ -19576,10 +21611,15 @@ impl Interpreter { let sent_none = matches!(frame.stack[n - 1], Object::None); // SAFETY: nothing below reaches the cell again until `state`'s last // use (`peek_mut` rejects a live guard or shared cells). - let Some(state) = (unsafe { g.state.peek_mut() }) else { + let Some(state) = (unsafe { g.state_raw().peek_mut() }) else { return SendHop::Declined; }; let GeneratorState::Suspended(boxed) = &*state else { + // The outermost level of a parked chain: its innermost + // generator resumes directly (anything else settles it). + if let (true, Some(addr)) = (sent_none, Self::parked_head(g)) { + return self.core_send_unpark(sw, send_pc, InlineResume::Send, addr); + } return SendHop::Declined; }; let gf: &Frame = boxed; @@ -19603,11 +21643,50 @@ impl Interpreter { if sent_none && !gf.sent_consumed && g.kind != crate::object::CoroutineKind::AsyncGenerator { if let Some((next, next_send)) = Self::collapse_next(gf) { + // A simple delegate of its own takes a fast step (see + // `Self::delegate_step`). + if gen_fast::may_step(next) { + let (next, gf): (*const Rc, *mut Frame) = + (next, std::ptr::from_ref(gf).cast_mut()); + // SAFETY: `next` lives on the delegate's stack, which the + // step leaves; nothing else reaches its state meanwhile. + if let Some(hop) = self.delegate_step( + sw, + send_pc, + InlineResume::Send, + gf, + unsafe { &*next }, + next_send, + ) { + return hop; + } + } + // Its delegate heads a parked chain: the delegate joins it. + if let Some(addr) = Self::parked_head(next) { + // SAFETY: `g` is suspended in a `yield from` of the + // chain's outermost level (checked above). + unsafe { + Self::collapse_prepend( + addr, + Rc::as_ptr(g), + std::ptr::from_ref(gf).cast_mut(), + next_send, + ); + } + return self.core_send_unpark(sw, send_pc, InlineResume::Send, addr); + } if let Some(next_frame) = Self::collapse_frame(next) { let (g, gf) = (Rc::as_ptr(g), std::ptr::from_ref(gf).cast_mut()); - return if self - .core_send_collapse(sw, send_pc, g, gf, next, next_send, next_frame) - { + return if self.core_send_collapse( + sw, + send_pc, + InlineResume::Send, + g, + gf, + next, + next_send, + next_frame, + ) { SendHop::Collapsed } else { SendHop::Declined @@ -19666,6 +21745,59 @@ impl Interpreter { SendHop::Hopped } + /// The address of the parked chain `g` is the outermost level of (see + /// [`ChainRec`]), if any. + #[inline(always)] + fn parked_head(g: &PyGenerator) -> Option { + let addr = g.chain.get(); + if addr == 0 { + return None; + } + // SAFETY: a level's record is alive (see `ChainRec`). + let rec = unsafe { &*(addr as *const ChainRec) }; + (rec.parked && std::ptr::eq(rec.levels[0].gen, g)).then_some(addr) + } + + /// Make `g` (frame `gf`, suspended in the `yield from` at `level_send` + /// of the outermost level of the parked chain at `addr`) the chain's + /// new outermost level, delegating just past its `SEND`. + /// + /// # Safety + /// + /// As described: `g` is alive, qualified as a level (see + /// [`Self::collapse_frame`]), and nothing borrows its state. + #[cold] + #[inline(never)] + unsafe fn collapse_prepend( + addr: usize, + g: *const PyGenerator, + gf: *mut Frame, + level_send: usize, + ) { + // SAFETY: the caller's contract; a parked record owns itself. + unsafe { + let rec = &mut *(addr as *mut ChainRec); + let st = (*g).state_raw().as_ptr(); + let GeneratorState::Suspended(boxed) = std::ptr::read(st) else { + unreachable!("checked by the caller"); + }; + std::ptr::write(st, GeneratorState::Delegating(boxed)); + (*g).chain.set(addr); + (*gf).pc = level_send as u32 + 1; + rec.levels.insert( + 0, + Delegate { + gen: g, + act: LeanAct { + frame: gf, + shell: None, + }, + send_pc: level_send, + }, + ); + } + } + /// `g` as a collapsed chain's level or innermost generator (see /// [`Self::core_send_collapse`]): suspended, with nothing a lean resume /// declines (the checks of [`Self::core_send_hop`]). Its frame, or @@ -19683,7 +21815,7 @@ impl Interpreter { return None; } // SAFETY: a read between instructions; the view ends here. - let GeneratorState::Suspended(boxed) = (unsafe { g.state.peek_mut() })? else { + let GeneratorState::Suspended(boxed) = (unsafe { g.state_raw().peek_mut() })? else { return None; }; let gf: &mut Frame = boxed; @@ -19731,6 +21863,25 @@ impl Interpreter { } } + /// [`Self::collapse_next`], skipping the instruction checks for a + /// frame at the code and pc `memo` holds (and recording them there). + #[inline(always)] + fn collapse_next_memo<'f>( + frame: &'f Frame, + memo: &mut (*const CodeObject, u32, usize), + ) -> Option<(&'f Rc, usize)> { + let code = Rc::as_ptr(&frame.code); + if code == memo.0 && frame.pc == memo.1 { + return match frame.stack.last() { + Some(Object::Generator(g) | Object::Coroutine(g)) => Some((g, memo.2)), + _ => None, + }; + } + let found = Self::collapse_next(frame)?; + *memo = (code, frame.pc, found.1); + Some(found) + } + /// The `SEND` of `None` at `send_pc` of `sw`'s (synced) running /// activation to `first` (frame `first_frame`, both checked by /// [`Self::core_send_hop`]), a generator itself suspended in a @@ -19741,42 +21892,303 @@ impl Interpreter { /// parked in their own `SEND`s, marked executing /// ([`GeneratorState::Delegating`]), and wait on the pending list, so /// a flush puts them on the spine. A yield comes straight back to - /// this `SEND` ([`Self::core_uncollapse`] puts the levels back as - /// running them would have left them); a return or a raise resumes - /// only the innermost level ([`Self::collapse_expand_one`]). `false` - /// touches nothing. + /// this `SEND` and parks the chain ([`Self::collapse_park`]); a + /// return or a raise resumes only the innermost level + /// ([`Self::collapse_expand_one`]). `false` touches nothing. #[allow(clippy::too_many_arguments)] #[inline(never)] fn core_send_collapse( &mut self, sw: &mut CoreSwitch, send_pc: usize, + mode: InlineResume, first: *const PyGenerator, first_frame: *mut Frame, - mut inner: &Rc, + inner: &Rc, + level_send: usize, + inner_frame: *mut Frame, + ) -> bool { + let mut rec = self.chain_rec(); + // SAFETY: `first` is suspended in a `yield from` of `inner`, both + // qualified by the caller. + let (inner, inner_frame) = unsafe { + Self::collapse_walk( + &mut rec, + first, + first_frame, + Rc::as_ptr(inner), + level_send, + inner_frame, + ) + }; + let (inner, inner_frame) = match self.chain_step(sw, send_pc, mode, &mut rec) { + ChainStep::No => (inner, inner_frame), + ChainStep::Inner(inner, inner_frame) => (inner, inner_frame), + ChainStep::Delivered => { + self.chain_repark(rec); + return true; + } + ChainStep::Resume => { + self.chain_recycle(rec); + return false; + } + }; + match self.collapse_commit(sw, send_pc, mode, rec, inner, inner_frame) { + Ok(()) => true, + Err(mut rec) => { + for level in rec.levels.drain(..).rev() { + // SAFETY: delegating since the walk. + unsafe { level.suspend() }; + } + self.chain_recycle(rec); + false + } + } + } + + /// The innermost generator of the collapsed chain `rec` (taken to run + /// for the consumer's `mode` at `pc`, see [`Self::collapse_commit`]) + /// by fast step (see `gen_fast`) instead of as an activation: a yield + /// passes every level by, leaving each where it was, so it goes to + /// the consumer directly ([`ChainStep::Delivered`]); a return resumes + /// the innermost level in its `SEND`'s exit with the value + /// ([`ChainStep::Inner`], or [`ChainStep::Resume`] when that level is + /// the chain's only one, for the consumer to resume as usual). + #[inline(always)] + fn chain_step( + &mut self, + sw: &mut CoreSwitch, + pc: usize, + mode: InlineResume, + rec: &mut ChainRec, + ) -> ChainStep { + let last = rec.levels.last().expect("a collapsed chain"); + // SAFETY: the innermost level is alive and delegating: its frame + // sits in its `SEND`, its delegate on top. + match (unsafe { &*last.act.frame }).stack.last() { + Some(Object::Generator(inner)) if gen_fast::may_step(inner) => { + let inner: *const Rc = inner; + self.chain_step_run(sw, pc, mode, rec, inner) + } + _ => ChainStep::No, + } + } + + /// [`Self::chain_step`] for an innermost generator `inner` a fast step + /// may run. + #[inline(never)] + fn chain_step_run( + &mut self, + sw: &mut CoreSwitch, + pc: usize, + mode: InlineResume, + rec: &mut ChainRec, + inner: *const Rc, + ) -> ChainStep { + // (Its levels count against the recursion limit, as when resumed.) + // SAFETY: the running thread's own cell. + if unsafe { (*sw.depth_cell).get() } + rec.levels.len() + 2 + >= crate::recursion::recursion_limit() + { + return ChainStep::No; + } + // SAFETY: held by the innermost level's stack, which nothing below + // changes before the step ends. + let inner = unsafe { &*inner }; + match self.gen_fast_next(inner, sw.snap_gen, 0, sw.maybe_dead) { + gen_fast::GenNext::Yielded(v) => { + // The outermost level goes once the chain parks. + rec.hold = self.step_deliver(sw, pc, mode, v); + ChainStep::Delivered + } + gen_fast::GenNext::Exhausted(v) => { + // The innermost level's `SEND` exits with the return value, + // the level suspended there having taken it. + let level = rec.levels.pop().expect("a collapsed chain"); + // SAFETY: alive and delegating (see `Delegate`); its frame + // just past its `SEND`, its delegate on top. + unsafe { + level.suspend(); + let frame = &mut *level.act.frame; + let jump = frame.code.instructions[level.send_pc].arg; + frame.pc = level.send_pc as u32 + 1 + jump; + frame.stack.push(v); + frame.sent_consumed = true; + } + if rec.levels.is_empty() { + ChainStep::Resume + } else { + ChainStep::Inner(level.gen, level.act.frame) + } + } + gen_fast::GenNext::Declined | gen_fast::GenNext::Partial => ChainStep::No, + } + } + + /// The value `v` a fast step of the generator the consumer's `mode` + /// at `pc` resumes (or of that generator's delegate) yielded, as the + /// consumer's result: its operands leave as the instruction's own + /// resume takes them, and the generator a `next()` or `send()` call + /// held is returned, for the caller to release once the chain is + /// settled. + fn step_deliver( + &mut self, + sw: &mut CoreSwitch, + pc: usize, + mode: InlineResume, + v: Object, + ) -> Option> { + // SAFETY: see `CoreSwitch`: the consumer is the running activation, + // synced, its operands as `mode` has them. + let frame = unsafe { &mut *sw.cur }; + let mut held = None; + match mode { + InlineResume::Send => { + // The value takes the sent `None`'s place. + if let Some(top) = frame.stack.last_mut() { + drop(std::mem::replace(top, v)); + } + } + InlineResume::ForIter => frame.stack.push(v), + InlineResume::NextCall | InlineResume::NextDefault => { + if mode == InlineResume::NextDefault { + drop(frame.stack.pop()); + } + let (g, b, a) = (frame.stack.pop(), frame.stack.pop(), frame.stack.pop()); + if let Some(Object::Generator(g)) = g { + held = Some(g); + } + drop((a, b)); + frame.stack.push(v); + } + InlineResume::SendCall => { + held = Self::send_call_pop(frame); + frame.stack.push(v); + } + } + frame.pc = pc as u32 + 1; + // SAFETY: as above. + unsafe { *sw.last = pc }; + // Anything the step released may have queued a finalizer, run + // before the consumer's next instruction. + // SAFETY: the running thread's own flag. + if unsafe { (*sw.maybe_dead).get() } { + sw.pending = Some(CoreExit::Stop(LeafStop::Marked)); + } + held + } + + /// The resume (the consumer's `mode` at `pc`) of a generator (frame + /// `gf`) suspended in the `yield from` at `send_pc` of `inner`, a + /// simple generator, by `inner`'s fast step (see `gen_fast`): a yield + /// passes the generator by, leaving it where it was, and goes to the + /// consumer directly (`Collapsed`); a return lands in the generator's + /// `SEND` exit, which it takes as its sent value, for the consumer to + /// resume it as usual (`Declined`). `None` when the step declined. + #[inline(never)] + fn delegate_step( + &mut self, + sw: &mut CoreSwitch, + pc: usize, + mode: InlineResume, + gf: *mut Frame, + inner: &Rc, + send_pc: usize, + ) -> Option { + // (The generator counts against the recursion limit, as resumed.) + // SAFETY: the running thread's own cell. + if unsafe { (*sw.depth_cell).get() } + 3 >= crate::recursion::recursion_limit() { + return None; + } + match self.gen_fast_next(inner, sw.snap_gen, 0, sw.maybe_dead) { + gen_fast::GenNext::Yielded(v) => { + drop(self.step_deliver(sw, pc, mode, v)); + Some(SendHop::Collapsed) + } + gen_fast::GenNext::Exhausted(v) => { + // SAFETY: the generator is suspended (checked by the + // caller), its frame at the `RESUME` after the yield. + unsafe { + let frame = &mut *gf; + let jump = frame.code.instructions[send_pc].arg; + frame.pc = send_pc as u32 + 1 + jump; + frame.stack.push(v); + frame.sent_consumed = true; + } + Some(SendHop::Declined) + } + gen_fast::GenNext::Declined | gen_fast::GenNext::Partial => None, + } + } + + /// A `send(None)` call's operands (see [`Self::resumed_gen`]) off + /// `frame`'s stack: the generator it resumes, which the caller keeps. + fn send_call_pop(frame: &mut Frame) -> Option> { + let (v, b, a) = (frame.stack.pop(), frame.stack.pop(), frame.stack.pop()); + let g = match (&a, &b) { + (Some(Object::BoundMethod(bm)), _) => match &bm.receiver { + Object::Generator(g) | Object::Coroutine(g) => Some(g.clone()), + _ => None, + }, + (_, Some(Object::Generator(g) | Object::Coroutine(g))) => Some(g.clone()), + _ => None, + }; + drop((v, b, a)); + g + } + + /// Park `rec` again (see [`ChainRec`]) after its innermost generator's + /// yield went to the consumer directly ([`Self::chain_step`]). + fn chain_repark(&mut self, mut rec: Box) { + rec.parked = true; + let hold = rec.hold.take(); + let _ = Box::into_raw(rec); + // (Last: its release may settle the chain.) + drop(hold); + } + + /// Add `g` (frame `gf`, suspended in the `yield from` at `level_send` + /// of `inner`, which `inner_frame` qualifies) to `rec` as its + /// innermost level, and every generator below it that qualifies in + /// turn, each made delegating just past its `SEND` + /// ([`Delegate::suspend`] undoes it). Returns the chain's innermost + /// generator, suspended, and its frame. + /// + /// # Safety + /// + /// As described: `g` and `inner` are alive (`inner` held by `g`'s + /// stack) and suspended, with no borrow of their state live. + #[inline(always)] + unsafe fn collapse_walk( + rec: &mut ChainRec, + mut g: *const PyGenerator, + mut gf: *mut Frame, + mut inner: *const PyGenerator, mut level_send: usize, mut inner_frame: *mut Frame, - ) -> bool { - let mut act = self.inline_slot(); - debug_assert!(act.delegates.is_empty()); - let (mut g, mut gf) = (first, first_frame); + ) -> (*const PyGenerator, *mut Frame) { + let addr = std::ptr::from_mut(rec) as usize; // The code objects whose lean resume a level already vouched for // (a recursive generator's levels share one). let mut code_ok: *const CodeObject = std::ptr::null(); + // The last level's code, pc and `SEND` (a recursive generator's + // levels mostly share all three). + let mut resend: (*const CodeObject, u32, usize) = (std::ptr::null(), u32::MAX, 0); loop { - // The level delegates from here (`Delegate::suspend` undoes it). // SAFETY: each level is alive (its holder is the level above, // or the running activation) and suspended (checked), with no // borrow of its state live; the box moves between variants // without drop glue. unsafe { - let st = (*g).state.as_ptr(); + let st = (*g).state_raw().as_ptr(); let GeneratorState::Suspended(boxed) = std::ptr::read(st) else { unreachable!("checked by `collapse_frame`"); }; std::ptr::write(st, GeneratorState::Delegating(boxed)); + (*g).chain.set(addr); + (*gf).pc = level_send as u32 + 1; } - act.delegates.push(Delegate { + rec.levels.push(Delegate { gen: g, act: LeanAct { frame: gf, @@ -19784,21 +22196,40 @@ impl Interpreter { }, send_pc: level_send, }); - g = Rc::as_ptr(inner); + g = inner; gf = inner_frame; // SAFETY: as above. - let Some((next, next_send)) = Self::collapse_next(unsafe { &*gf }) else { + let Some((next, next_send)) = Self::collapse_next_memo(unsafe { &*gf }, &mut resend) + else { break; }; let Some(next_frame) = Self::collapse_frame_with(next, &mut code_ok) else { break; }; - inner = next; + inner = Rc::as_ptr(next); level_send = next_send; inner_frame = next_frame; } + (g, gf) + } + + /// Run `inner` (frame `inner_frame`, suspended and qualified), the + /// innermost generator of the chain whose delegating levels `rec` + /// holds, for the running activation's resume of the outermost level + /// at `pc`: a `SEND` of `None` (see [`Self::core_send_collapse`]), a + /// `FOR_ITER` or a `next()` (`mode`, as [`Self::try_inline_gen`] + /// takes them). Past the recursion limit, `rec` comes back untouched. + fn collapse_commit( + &mut self, + sw: &mut CoreSwitch, + pc: usize, + mode: InlineResume, + mut rec: Box, + inner: *const PyGenerator, + inner_frame: *mut Frame, + ) -> Result<(), Box> { // Each level counts against the recursion limit, as when resumed. - let levels = act.delegates.len(); + let levels = rec.levels.len(); let guard = if crate::recursion::enter_n(sw.depth_cell, levels) { match crate::recursion::enter_with(sw.depth_cell) { crate::recursion::Enter::Ok(guard) => Some(guard), @@ -19811,39 +22242,72 @@ impl Interpreter { None }; let Some(guard) = guard else { - for level in act.delegates.drain(..) { - // SAFETY: delegating since above. - unsafe { level.suspend() }; - } - if self.inline_pool.len() < INLINE_POOL_CAP { - self.inline_pool.push(act); - } - return false; + return Err(rec); + }; + // Committed. + // SAFETY: alive (held by the innermost level's stack). + let inner = unsafe { + Rc::increment_strong_count(inner); + Rc::from_raw(inner) }; - // Committed: each level is just past its `SEND`. - for level in &act.delegates { - // SAFETY: the level's frame, in its generator's box. - unsafe { (*level.act.frame).pc = level.send_pc as u32 + 1 }; - } - let inner = inner.clone(); // SAFETY: suspended (checked), no borrow of its state live. let GeneratorState::Suspended(mut boxed) = std::mem::replace( - unsafe { &mut *inner.state.as_ptr() }, + unsafe { &mut *inner.state_raw().as_ptr() }, GeneratorState::Running, ) else { unreachable!("checked by `collapse_frame`"); }; + debug_assert!(std::ptr::eq::(&raw const *boxed, inner_frame)); boxed.gen_first_resume = false; + // (A step that stopped partway, or the innermost level's delegate's + // return delivered by one, already gave it its value.) + let sent_consumed = std::mem::take(&mut boxed.sent_consumed); // SAFETY: see `CoreSwitch`: the running activation is synced, its - // stack `[.., first, None]` (checked by `core_send_hop`). + // stack as `mode` has it (checked by the caller). let frame = unsafe { &mut *sw.cur }; - let jump = frame.code.instructions[send_pc].arg; - // The sent `None` goes in. - frame.stack.pop(); - boxed.stack.push(Object::None); - frame.pc = send_pc as u32 + 1; + // The consumer's operands leave as `inline_gen_commit` takes them; + // the outermost level's activation keeps a `next()`'s generator. + let arg = match mode { + InlineResume::Send => { + // The sent `None`. + frame.stack.pop(); + frame.code.instructions[pc].arg | GEN_SEND + } + InlineResume::ForIter => frame.code.instructions[pc].arg, + InlineResume::NextCall => { + let (g, b, a) = (frame.stack.pop(), frame.stack.pop(), frame.stack.pop()); + let Some(Object::Generator(g)) = g else { + unreachable!("checked by `core_iter_collapse`"); + }; + rec.hold = Some(g); + drop((a, b)); + GEN_NEXT_CALL + } + InlineResume::NextDefault => { + let default = frame.stack.pop().expect("checked above"); + let (g, b, a) = (frame.stack.pop(), frame.stack.pop(), frame.stack.pop()); + let Some(Object::Generator(g)) = g else { + unreachable!("checked by `core_iter_collapse`"); + }; + rec.hold = Some(g); + frame.stack.push(default); + drop((a, b)); + GEN_NEXT_DEFAULT + } + InlineResume::SendCall => { + rec.hold = Self::send_call_pop(frame); + GEN_NEXT_CALL + } + }; + // The resume's `None` goes in. + if !sent_consumed { + boxed.stack.push(Object::None); + } + frame.pc = pc as u32 + 1; let gen_frame: *mut Frame = &raw mut *boxed; + let mut act = self.inline_slot(); debug_assert!(act.gen.is_none() && act.gen_box.is_none() && act.guard.is_none()); + debug_assert!(act.chain.is_none()); // SAFETY: a pooled slot holds none of these (see `try_inline_gen`). unsafe { std::ptr::write(&raw mut act.gen, Some(inner)); @@ -19851,54 +22315,184 @@ impl Interpreter { std::ptr::write(&raw mut act.guard, Some(guard)); } act.gen_frame = gen_frame; - act.exhaust_arg = jump | GEN_SEND; + act.exhaust_arg = arg; act.act.frame = gen_frame; - act.call_pc = send_pc; - act.caller_pending = self.core_pending_enter(sw, frame, send_pc); + act.call_pc = pc; + act.caller_pending = self.core_pending_enter(sw, frame, pc); act.exc_depth = self.exc_info_len(); // The levels wait on the pending list, outermost first, as each // would while the next one ran (the buffer stays put from here). - for level in &mut act.delegates { - self.lean_pending.push(&raw mut level.act as usize); + rec.pend_at = self.lean_pending.len(); + self.lean_pending.reserve(levels); + // SAFETY: reserved: each entry is written in place, and the length + // covers them once all are. + unsafe { + let base = self.lean_pending.as_mut_ptr().add(rec.pend_at); + for (k, level) in rec.levels.iter_mut().enumerate() { + base.add(k).write(&raw mut level.act as usize); + } + self.lean_pending.set_len(rec.pend_at + levels); } + act.chain = Some(rec); // SAFETY: see `CoreSwitch`. unsafe { push_fast(&mut *sw.inl, act) }; sw.cur = gen_frame; sw.scratch = usize::MAX; sw.last = &raw mut sw.scratch; - true + Ok(()) } - /// A collapsed chain's innermost generator yielded (`done`, its - /// finished activation, still holds the levels; the value goes to the - /// consumer): put the levels back as running them would have left - /// them, each suspended at its `yield from`. Only for levels without - /// a shell (see [`Self::collapse_expand_one`] otherwise). - #[inline] - fn core_uncollapse(&mut self, done: &mut InlineAct) { - let levels = done.delegates.len(); - debug_assert!(done.delegates.iter().all(|l| l.act.shell.is_none())); - // Still pending means nothing flushed (a flush drains the list). - if let Some(innermost) = done.delegates.last_mut() { - let addr = &raw mut innermost.act as usize; - if self.lean_pending.last() == Some(&addr) { - let len = self.lean_pending.len(); - self.lean_pending.truncate(len - levels); + /// The `SEND` of `None` (or the `FOR_ITER` or `next()`, `mode`) at + /// `pc` of `sw`'s (synced) running activation to the outermost level + /// of the parked chain whose record is at `addr` (see [`ChainRec`]): + /// its innermost generator resumes directly, as + /// [`Self::core_send_collapse`] resumes it, with any generators that + /// innermost one has since started delegating to added as levels. + /// Anything that doesn't qualify leaves the chain parked (the + /// instruction's full handler settles it). + #[inline(never)] + fn core_send_unpark( + &mut self, + sw: &mut CoreSwitch, + pc: usize, + mode: InlineResume, + addr: usize, + ) -> SendHop { + // SAFETY: a parked record owns itself (see `ChainRec`); taken + // here, put back below unless the chain runs. + let mut rec = unsafe { Box::from_raw(addr as *mut ChainRec) }; + rec.parked = false; + let repark = |mut rec: Box| { + rec.parked = true; + let _ = Box::into_raw(rec); + SendHop::Declined + }; + let last = rec.levels.last().expect("a collapsed chain"); + // SAFETY: the innermost level is alive and parked: its frame sits + // in its `SEND`, its delegate on top (held there until it runs). + let inner: &Rc = match unsafe { &*last.act.frame }.stack.last() { + Some(Object::Generator(g) | Object::Coroutine(g)) => unsafe { &*std::ptr::from_ref(g) }, + _ => return repark(rec), + }; + // A simple innermost generator takes a fast step first. + let stepped = if gen_fast::steps_body(inner) { + match self.chain_step_run(sw, pc, mode, &mut rec, inner) { + ChainStep::No => None, + ChainStep::Inner(inner, inner_frame) => Some((inner, inner_frame)), + ChainStep::Delivered => { + self.chain_repark(rec); + return SendHop::Collapsed; + } + ChainStep::Resume => { + self.chain_recycle(rec); + return SendHop::Declined; + } + } + } else { + None + }; + let base = rec.levels.len(); + let (inner, inner_frame) = match stepped { + // The innermost level took its delegate's return value. + Some(stepped) => stepped, + None => { + let (inner, inner_frame) = match Self::collapse_frame(inner) { + Some(frame) => (Rc::as_ptr(inner), frame), + None => return repark(rec), + }; + // The innermost generator may since have started delegating + // (a `yield from` of a fresh generator): its own chain joins. + // SAFETY: as `core_send_collapse` (the innermost generator + // was just qualified, and with it the generator it + // delegates to). + match Self::collapse_next(unsafe { &*inner_frame }) { + Some((next, next_send)) => match Self::collapse_frame(next) { + Some(next_frame) => unsafe { + Self::collapse_walk( + &mut rec, + inner, + inner_frame, + Rc::as_ptr(next), + next_send, + next_frame, + ) + }, + None => (inner, inner_frame), + }, + None => (inner, inner_frame), + } + } + }; + match self.collapse_commit(sw, pc, mode, rec, inner, inner_frame) { + Ok(()) => SendHop::Collapsed, + Err(mut rec) => { + for level in rec.levels.drain(base..).rev() { + // SAFETY: delegating since the walk. + unsafe { level.suspend() }; + } + repark(rec) } } - for level in done.delegates.drain(..).rev() { - // SAFETY: the levels are alive and delegating (see - // `Delegate::gen`); nothing borrows their state here. - unsafe { level.suspend() }; + } + + /// A collapsed chain's innermost generator yielded (`done`, its + /// finished activation, holds the levels, none flushed; the value + /// goes to the consumer): the chain parks (see [`ChainRec`]), its + /// levels still delegating, off the pending list and the recursion + /// depth. + #[inline] + fn collapse_park(&mut self, done: &mut InlineAct) { + let mut rec = done.chain.take().expect("a collapsed chain"); + debug_assert!(rec.levels.iter().all(|l| l.act.shell.is_none())); + debug_assert_eq!(self.lean_pending.len(), rec.pend_at + rec.levels.len()); + self.lean_pending.truncate(rec.pend_at); + crate::recursion::leave_n(crate::recursion::depth_cell(), rec.levels.len()); + rec.parked = true; + let hold = rec.hold.take(); + let _ = Box::into_raw(rec); + // (Last: its release may settle the chain.) + drop(hold); + } + + /// An empty [`ChainRec`], from the pool or fresh (boxed: see + /// [`Self::chain_pool`]). + #[inline] + #[allow(clippy::unnecessary_box_returns)] + fn chain_rec(&mut self) -> Box { + self.chain_pool.pop().unwrap_or_else(|| { + Box::new(ChainRec { + levels: Vec::new(), + parked: false, + pend_at: 0, + hold: None, + }) + }) + } + + /// Return an emptied [`ChainRec`] to the pool. + #[inline] + fn chain_recycle(&mut self, mut rec: Box) { + debug_assert!(rec.levels.is_empty()); + rec.parked = false; + drop(rec.hold.take()); + if self.chain_pool.len() < 16 { + self.chain_pool.push(rec); } - crate::recursion::leave_n(crate::recursion::depth_cell(), levels); } - /// Whether any level of `act`'s collapsed chain has a shell (a flush - /// put the levels on the spine). + /// Whether a flush may have put the levels of `act`'s collapsed chain + /// on the spine (given them shells). Unflushed, the levels' entries + /// are still the pending list's newest ones where the chain put them + /// (a flush drains entries oldest first, and only the chain pushes + /// these). #[inline] - fn collapse_flushed(act: &InlineAct) -> bool { - act.delegates.iter().any(|l| l.act.shell.is_some()) + fn collapse_flushed(&self, act: &InlineAct) -> bool { + let Some(rec) = &act.chain else { + return false; + }; + let first = std::ptr::from_ref(&rec.levels[0].act) as usize; + self.lean_pending.len() != rec.pend_at + rec.levels.len() + || self.lean_pending.get(rec.pend_at) != Some(&first) } /// Resume the innermost level of `done`'s collapsed chain for real: @@ -19908,12 +22502,15 @@ impl Interpreter { /// to), and the returned activation runs the level, taking over the /// consumer-facing fields and the rest of the chain. fn collapse_expand_one(&mut self, done: &mut InlineAct) -> Box { - let addr = done - .delegates + let rec = done.chain.as_mut().expect("a collapsed chain"); + let addr = rec + .levels .last_mut() .map(|l| &raw mut l.act as usize) .expect("a collapsed chain"); - let level = done.delegates.pop().expect("a collapsed chain"); + let level = rec.levels.pop().expect("a collapsed chain"); + // SAFETY: alive, see `Delegate::gen`; it runs for real from here. + unsafe { (*level.gen).chain.set(0) }; // The level's pending entry was the innermost generator's caller // entry (the delegate's `lean_pending_exit` takes it). let level_pending = (level.act.shell.is_none()).then_some(addr); @@ -19925,13 +22522,14 @@ impl Interpreter { Rc::from_raw(level.gen) }; // SAFETY: delegating (see `Delegate`); nothing borrows the state. - let GeneratorState::Delegating(boxed) = - std::mem::replace(unsafe { &mut *gen.state.as_ptr() }, GeneratorState::Running) - else { + let GeneratorState::Delegating(boxed) = std::mem::replace( + unsafe { &mut *gen.state_raw().as_ptr() }, + GeneratorState::Running, + ) else { unreachable!("a collapsed level is delegating"); }; let mut act = self.inline_slot(); - debug_assert!(act.delegates.is_empty()); + debug_assert!(act.chain.is_none()); let gen_frame = level.act.frame; // SAFETY: a pooled slot holds none of these (see `try_inline_gen`); // the level's recursion depth was entered by the collapse. @@ -19952,7 +22550,11 @@ impl Interpreter { act.exhaust_arg = done.exhaust_arg; act.caller_pending = done.caller_pending.take(); act.exc_depth = done.exc_depth; - std::mem::swap(&mut act.delegates, &mut done.delegates); + // The rest of the chain (if any) stays collapsed under the level. + match done.chain.take() { + Some(rec) if rec.levels.is_empty() => self.chain_recycle(rec), + rest => act.chain = rest, + } // SAFETY: the level's frame, just past its `SEND`. let jump = unsafe { &*gen_frame }.code.instructions[level.send_pc].arg; done.call_pc = level.send_pc; @@ -20026,8 +22628,8 @@ impl Interpreter { .shell .as_deref() .is_some_and(|s| !self.shell_pops_quietly(s, top.exc_depth)) - || Self::collapse_flushed(top) - || self.gil_countdown <= 2 + || self.collapse_flushed(top) + || self.countdown_out(2) || crate::hot_gates::loop_gen() != snap_gen { return false; @@ -20061,12 +22663,13 @@ impl Interpreter { done.gen_frame = std::ptr::null_mut(); Self::park_suspended_boxed(&gen, boxed); drop(gen); - // A collapsed chain's levels suspend again in their `yield - // from`s, the value passing them by. - if !done.delegates.is_empty() { - self.core_uncollapse(&mut done); + // A collapsed chain's levels stay collapsed, the value passing + // them by (see `Self::collapse_park`). + if done.chain.is_some() { + self.collapse_park(&mut done); } let call_pc = done.call_pc; + let next_default = done.exhaust_arg == GEN_NEXT_DEFAULT; self.lean_pending_exit(done.caller_pending); // SAFETY: the shell was taken above: no drop glue owed. unsafe { std::ptr::write(&raw mut done.act.shell, None) }; @@ -20078,6 +22681,11 @@ impl Interpreter { let mut tmp = None; // SAFETY: the consumer is the innermost remaining activation. let (cframe, clast, cshell) = unsafe { sw.activation(depth - 1, &mut tmp) }; + // `next(gen, default)`: the value takes the default's place. + if next_default { + // SAFETY: as above. + drop(unsafe { (*cframe).stack.pop() }); + } sw.cur = cframe; sw.last = if clast == &raw mut sw.scratch { sw.scratch = usize::MAX; @@ -20100,7 +22708,7 @@ impl Interpreter { .shell .as_deref() .is_none_or(|s| self.shell_pops_quietly(s, t.exc_depth)) - && !Self::collapse_flushed(t) + && !self.collapse_flushed(t) }) && unsafe { &*cframe } .code @@ -20114,7 +22722,7 @@ impl Interpreter { } // SAFETY: as above. unsafe { push_fast(&mut (*cframe).stack, v) }; - if self.gil_countdown <= 2 { + if self.countdown_out(2) { sw.pending = Some(CoreExit::Stop(LeafStop::Breaker)); return true; } @@ -20150,11 +22758,9 @@ impl Interpreter { let Some(top) = inl.last_mut() else { return false; }; - // A shell (the general epilogue's), or `next(gen)`'s exhaustion - // (a `StopIteration`), finishes through `quiet_run`. + // A shell (the general epilogue's) finishes through `quiet_run`. if top.act.shell.is_some() - || top.exhaust_arg == GEN_NEXT_CALL - || self.gil_countdown <= 2 + || self.countdown_out(2) || crate::hot_gates::loop_gen() != snap_gen { return false; @@ -20173,14 +22779,14 @@ impl Interpreter { let gen = done.gen.take().expect("a generator activation"); let mut boxed = done.gen_box.take().expect("a generator activation"); done.gen_frame = std::ptr::null_mut(); - *gen.state.borrow_mut() = GeneratorState::Finished; + Self::finish_running_gen(&gen); self.recycle_frame_allocs(&mut boxed); Self::release_finished_gen(&gen); - drop(boxed); + self.recycle_gen_box(boxed); drop(gen); // A collapsed chain's innermost level takes the return value: it // resumes in its `SEND`, the rest of the chain still collapsed. - if !done.delegates.is_empty() { + if done.chain.is_some() { let level = self.collapse_expand_one(&mut done); push_fast(inl, level); } @@ -20197,7 +22803,17 @@ impl Interpreter { let (cframe, clast, cshell) = unsafe { sw.activation(inl.len(), &mut tmp) }; // SAFETY: as above. let consumer = unsafe { &mut *cframe }; - if arg & GEN_SEND != 0 { + let mut raised = None; + if arg == GEN_NEXT_CALL { + // `next(gen)` or `gen.send(v)`: `StopIteration(value)`, raised + // at the call (the consumer's `pc` is past it), as + // `inline_gen_deliver` raises it. + raised = Some(crate::error::stop_iteration_with(v)); + } else if arg == GEN_NEXT_DEFAULT { + // `next(gen, default)`: the default (atop the consumer's stack) + // is the result. + drop(v); + } else if arg & GEN_SEND != 0 { // `SEND`: the return value is the `yield from`/`await` result; // the sub-generator stays for `END_SEND`. consumer.stack.push(v); @@ -20217,10 +22833,15 @@ impl Interpreter { } else { clast }; + // The raise protocol of a call that raised (the leaf raise shape). + if let Some(e) = raised { + sw.pending = Some(CoreExit::Stop(LeafStop::Raised(e))); + return true; + } // The consumer's `QuietEntry::Returned` protocol (`quiet_frame`). // SAFETY: as above. unsafe { *sw.last = call_pc }; - if self.gil_countdown <= 2 { + if self.countdown_out(2) { sw.pending = Some(CoreExit::Stop(LeafStop::Breaker)); return true; } @@ -20262,13 +22883,12 @@ impl Interpreter { } // An activation whose shell the full epilogue would act on // finishes through `quiet_run`; so does a return into a caller - // whose protocol would yield straight away. - if top - .act - .shell - .as_deref() - .is_some_and(|s| !self.shell_pops_quietly(s, top.exc_depth)) - || self.gil_countdown <= 2 + // whose protocol would yield straight away. (A frame object alone + // settles in `retire_quiet_shell` while nothing observes returns.) + if top.act.shell.as_deref().is_some_and(|s| { + !self.shell_pops_quietly(s, top.exc_depth) + && (self.exc_info_len() > top.exc_depth || crate::trace::any_observers_active()) + }) || self.countdown_out(2) || crate::hot_gates::loop_gen() != snap_gen { return false; @@ -20303,7 +22923,14 @@ impl Interpreter { && Rc::strong_count(&frame.locals) == 1; let mut tmp = None; let (cframe, clast, cshell, entry); - if clean && done.init_inst.is_none() && done.binop.is_none() && !done.discard { + if clean + && (done.init_inst.is_none() || matches!(v, Object::None)) + && done.binop.is_none() + && !done.discard + { + // A constructor's `__init__` returned `None`: the caller takes + // the instance (`inline_deliver`'s epilogue). + let v = done.init_inst.take().unwrap_or(v); done.clean = !had_shell; // SAFETY: as above. // SAFETY: as above. @@ -20343,7 +22970,7 @@ impl Interpreter { // below. // SAFETY: as above. unsafe { *sw.last = call_pc }; - if self.gil_countdown <= 2 { + if self.countdown_out(2) { sw.pending = Some(CoreExit::Stop(LeafStop::Breaker)); return true; } @@ -20397,7 +23024,7 @@ impl Interpreter { // SAFETY: as above. unsafe { *sw.last = cur_pc }; // The caller's `Returned` entry protocol (`quiet_frame`). - if self.gil_countdown <= 2 { + if self.countdown_out(2) { sw.pending = Some(CoreExit::Stop(LeafStop::Breaker)); return true; } @@ -20452,7 +23079,9 @@ impl Interpreter { // `y.append` (a builtin container's method read as a value) and // `obj.__dict__`: sites the full handler never specializes. if ins.op == OpCode::LoadAttr { - if let Some(v) = self.leaf_plain_attr_value(code, stack.last(), ins.arg) { + let running = (Rc::as_ptr(&frame.locals).cast::<()>(), pc as u32); + if let Some(v) = self.leaf_plain_attr_value(code, stack.last(), ins.arg, Some(running)) + { if let Some(top) = stack.last_mut() { drop(std::mem::replace(top, v)); } @@ -20686,32 +23315,12 @@ impl Interpreter { code: &CodeObject, recv: Option<&Object>, name_idx: u32, + running: Option<(*const (), u32)>, ) -> Option { let recv = recv?; let name = code.names.get(name_idx as usize)?.as_str(); match recv { - // A code object's fields and a frame's plain ones (neither type - // can be subclassed, and no getter here runs Python); the full - // path keeps the deprecated `co_lnotab`, a generator frame's - // re-derived `f_back`, and a line-0 `f_lineno`. - Object::Code(c) if name != "co_lnotab" => crate::builtins::code_synthetic_attr(c, name), - Object::Frame(fr) => match name { - "f_code" => Some(Object::Code(fr.code.clone())), - "f_globals" => Some(Object::Dict(fr.globals.clone())), - "f_builtins" => Some(Object::Dict(fr.builtins.clone())), - "f_lineno" => match fr.current_lineno() { - 0 => None, - line => Some(Object::Int(i64::from(line))), - }, - "f_back" - if !(fr.code.is_generator - || fr.code.is_coroutine - || fr.code.is_async_generator) => - { - Some(fr.back_frame().map_or(Object::None, Object::Frame)) - } - _ => None, - }, + Object::Code(_) | Object::Frame(_) => Self::frame_plain_attr(recv, name, running), // `x.__class__` of a builtin value: its exact type (no instance // or class can override it there). Object::Generator(_) @@ -20732,6 +23341,64 @@ impl Interpreter { { Some(Object::Type(crate::builtins::class_of(recv))) } + _ => self.leaf_plain_attr_value_rest(recv, name), + } + } + + /// A code object's fields and a frame's plain ones (neither type can + /// be subclassed, and no getter here runs Python); the full path keeps + /// the deprecated `co_lnotab`, a generator frame's re-derived + /// `f_back`, and a line-0 `f_lineno`. A live frame's line is its + /// shell's `lasti` (see `PyFrame::live`), which is current unless its + /// activation is the one running: `running` names the running + /// activation (its locals' storage, which its frame object's mirror + /// shares) and the instruction it is at, if the caller knows them. + #[inline] + fn frame_plain_attr( + recv: &Object, + name: &str, + running: Option<(*const (), u32)>, + ) -> Option { + match recv { + Object::Code(c) if name != "co_lnotab" => crate::builtins::code_synthetic_attr(c, name), + Object::Frame(fr) => match name { + "f_code" => Some(Object::Code(fr.code.clone())), + "f_globals" => Some(Object::Dict(fr.globals.clone())), + "f_builtins" => Some(Object::Dict(fr.builtins.clone())), + "f_lineno" => { + if !fr.live.load(std::sync::atomic::Ordering::Relaxed).is_null() { + let (locals, pc) = running?; + let own = fr + .locals_mirror + .try_borrow() + .ok()? + .as_ref() + .is_some_and(|m| std::ptr::eq(Rc::as_ptr(m).cast::<()>(), locals)); + if own { + fr.set_lasti(pc); + } + } + match fr.current_lineno() { + 0 => None, + line => Some(Object::Int(i64::from(line))), + } + } + "f_back" + if !(fr.code.is_generator + || fr.code.is_coroutine + || fr.code.is_async_generator) => + { + Some(fr.back_frame().map_or(Object::None, Object::Frame)) + } + _ => None, + }, + _ => None, + } + } + + /// The rest of [`Self::leaf_plain_attr_value`]'s shapes. + fn leaf_plain_attr_value_rest(&self, recv: &Object, name: &str) -> Option { + match recv { Object::List(_) | Object::Dict(_) | Object::Set(_) @@ -20792,7 +23459,21 @@ impl Interpreter { let Some(name @ Object::Str(n)) = code_name_obj(code, ins.arg) else { return None; }; - if n.starts_with("__") { + // The names the function type (and `object`) define as data + // descriptors are the full handler's; any other lands in the + // function's `__dict__` (`wrapper.__wrapped__ = f`). + if n.starts_with("__") + && (crate::object::is_function_slot(n) + || matches!( + &**n, + "__code__" + | "__globals__" + | "__closure__" + | "__builtins__" + | "__dict__" + | "__class__" + )) + { return None; } let n_ = stack.len(); @@ -20978,10 +23659,7 @@ impl Interpreter { return None; } let args = ops.get(2..2 + argc)?; - if !ops - .iter() - .all(|o| matches!(o, Object::Unbound) || Self::core_droppable(o)) - { + if !Self::core_all_droppable(ops) { return None; } return if cls.flags.is_builtin { @@ -20999,10 +23677,7 @@ impl Interpreter { } else { (&[], &[]) }; - if !ops - .iter() - .all(|o| matches!(o, Object::Unbound) || Self::core_droppable(o)) - { + if !Self::core_all_droppable(ops) { return None; } crate::stdlib::datetime_native::construct_names(cls, args, names, values)?.ok() @@ -21014,10 +23689,7 @@ impl Interpreter { /// for the full handler, which also raises every error. #[inline(never)] fn core_native_method_kw(ops: &[Object], argc: usize) -> Option { - if !ops - .iter() - .all(|o| matches!(o, Object::Unbound) || Self::core_droppable(o)) - { + if !Self::core_all_droppable(ops) { return None; } crate::stdlib::decimal_native::method_kw(ops, argc) @@ -21067,11 +23739,7 @@ impl Interpreter { bound[i] = Some(value); } let n = bound.iter().take_while(|a| a.is_some()).count(); - if bound[n..].iter().any(Option::is_some) - || !ops - .iter() - .all(|o| matches!(o, Object::Unbound) || Self::core_droppable(o)) - { + if bound[n..].iter().any(Option::is_some) || !Self::core_all_droppable(ops) { return None; } let mut args = Vec::with_capacity(n + 1); @@ -21096,10 +23764,7 @@ impl Interpreter { return None; } let fast = crate::stdlib::datetime_native::bound_fast(&bm.function, &bm.receiver)?; - if !ops - .iter() - .all(|o| matches!(o, Object::Unbound) || Self::core_droppable(o)) - { + if !Self::core_all_droppable(ops) { return None; } // Bitwise views of the receiver and the arguments, never dropped: @@ -21138,13 +23803,61 @@ impl Interpreter { } /// A module attribute through the `LOAD_ATTR` site's cached index: - /// the value, cloned, or `None` for the helper's full path. + /// the value, cloned, or `None` for the helper's full path. A site + /// remembers the module dict's stamp and the entry's position once a + /// read proves them (see [`MODULE_ENTRY`]), so a warm read is a stamp + /// compare and an indexed load (CPython's `LOAD_ATTR_MODULE`). #[inline] fn core_module_attr( code: &CodeObject, m: &crate::object::PyModule, pc: usize, name_idx: u32, + ) -> Option { + // SAFETY: a read between two instructions (see `GilCell::peek`). + let dict = unsafe { m.dict.peek() }?; + if let Some(slot) = code_vm_ext(code).and_then(|ext| ext.stamp_slot(pc)) { + let [stamp, tag, idx] = slot.get(); + if tag == MODULE_ENTRY && stamp == dict.mutation_stamp() { + if let Some((_, v)) = dict.get_index(idx as usize) { + return Some(Self::clone_operand(v)); + } + } + } + Self::core_module_attr_indexed(code, m, pc, name_idx) + } + + /// [`Self::core_module_attr`] through the site's inline cache, which + /// on a hit also fills the site's [`MODULE_ENTRY`] stamp. + #[inline(never)] + fn core_module_attr_indexed( + code: &CodeObject, + m: &crate::object::PyModule, + pc: usize, + name_idx: u32, + ) -> Option { + let v = Self::core_module_attr_cached(code, m, pc, name_idx)?; + // SAFETY: as above (the read above ran no code). + if let (Some(dict), Some(slot)) = + (unsafe { m.dict.peek() }, code_stamp_slot(code, pc as u32)) + { + if let weavepy_compiler::InlineCache::LoadAttrModule { key_idx, .. } = + code.caches.get(pc as u32) + { + slot.set([dict.mutation_stamp(), MODULE_ENTRY, u64::from(key_idx)]); + } + } + Some(v) + } + + /// [`Self::core_module_attr_indexed`]'s read of the site's inline + /// cache. + #[inline] + fn core_module_attr_cached( + code: &CodeObject, + m: &crate::object::PyModule, + pc: usize, + name_idx: u32, ) -> Option { use weavepy_compiler::InlineCache as IC; let IC::LoadAttrModule { module_id, key_idx } = code.caches.get(pc as u32) else { @@ -21175,9 +23888,7 @@ impl Interpreter { // SAFETY: as above; the shared view above is no longer used. if let Some(d) = unsafe { m.dict.peek_mut() } { let map: &mut crate::object::DictMap = &mut *d; - if let Some((key, _)) = - indexmap::map::MutableKeys::get_index_mut2(map, key_idx as usize) - { + if let Some((key, _)) = map.get_index_mut2(key_idx as usize) { key.0 = Object::Str(name); } } @@ -21203,7 +23914,7 @@ impl Interpreter { } // A scalar class attribute the instance doesn't shadow, or a // named tuple field (see `leaf_attr_resolve_site`). - if let Some(slot) = ext.stamp_slots.get().and_then(|s| s.get(attr_pc)) { + if let Some(slot) = ext.stamp_slot(attr_pc) { if let Some(v) = class_attr_hit_via(slot, inst.cls_raw(), CLASS_ATTR_VIA_INSTANCE) { if !inst_may_shadow(inst, code, name_idx) { return Some(v); @@ -21228,13 +23939,16 @@ impl Interpreter { return None; } if let Some(ext) = ext { - field_slot_note(ext, code.instructions.len(), attr_pc, inst, key_idx); + field_slot_note(ext, code, attr_pc, inst, key_idx); } return Some(Self::clone_operand(v)); } // `leaf_fused_local_attr`, over the decoded cache. if matches!(cache, IC::Empty) { - return None; + return match local { + Object::Instance(inst) => inst_dict_attr(code, inst, attr_pc, name_idx), + _ => None, + }; } match local { Object::Instance(i) if i.cls_raw().native_kind.get() == 0 => {} @@ -21299,6 +24013,9 @@ impl Interpreter { .get_index(key_idx as usize) .filter(|(key, _)| slot_name_matches(code, ins.arg, key)) .map(|(_, value)| value); + if let (Some(_), Some(ext)) = (indexed, ext) { + slot_field_note(code, ext, pc, inst, key_idx, ins.arg); + } indexed.or_else(|| slots.get(name)) } _ => { @@ -21316,14 +24033,14 @@ impl Interpreter { } if ver == cached => { let hit = indexed(key_idx); if let (Some(_), Some(ext)) = (hit, ext) { - field_slot_note(ext, code.instructions.len(), pc, inst, key_idx); + field_slot_note(ext, code, pc, inst, key_idx); } hit } _ => None, }; primary.or_else(|| { - let poly = code_vm_ext(code)?.attr_poly.get()?.get(pc)?; + let poly = code_vm_ext(code)?.attr_poly_slot(pc)?; indexed(poly.index(ver)?) }) } @@ -21379,30 +24096,40 @@ impl Interpreter { use weavepy_compiler::InlineCache as IC; let cls = inst.cls_raw(); let ext = code_vm_ext(code); - if let Some((ver, idx)) = ext - .and_then(|e| e.field_slots.get()) - .and_then(|slots| slots.get(attr_pc)) - .map(FieldSlot::get) - { - if cls.attr_version.get() == ver && !crate::capi_watchers::dicts_active() { + if let Some((ver, idx)) = ext.and_then(|e| e.field_slot(attr_pc)).map(FieldSlot::get) { + if cls.attr_version.get() != ver { + // Another class's (or version's) shortcut: the site's + // cache below decides. + } else if idx & SLOT_FIELD != 0 { + // A laid-out `__slots__` member, set or not: the member + // descriptor's store, in place. // SAFETY: a store between two instructions (see `peek_mut`). - if let Some(slot) = - unsafe { inst.split_field_mut(idx as usize, value.is_gc_atomic()) } - { - if Self::core_droppable(slot) { - // SAFETY: as the indexed store below. - drop(std::mem::replace(slot, unsafe { std::ptr::read(value) })); - return true; + if let Some(slot) = unsafe { + inst.laid_out_slot_mut((idx & !SLOT_FIELD) as usize, value.is_gc_atomic()) + } { + if !Self::core_droppable(slot) { + return false; } - return false; + // SAFETY: as the indexed store below. + drop(std::mem::replace(slot, unsafe { std::ptr::read(value) })); + return true; } - // The constructor shape: the attribute is the instance's - // next one. - // SAFETY: as above; the value moves out of the caller's - // stack slot, and a declined append hands the bits back. - match unsafe { inst.split_append(idx as usize, std::ptr::read(value)) } { + } else if !crate::capi_watchers::dicts_active() { + // Over the attribute's value, or (the constructor shape) as + // the instance's next one. + // SAFETY: a store between two instructions (see `peek_mut`); + // the value moves out of the caller's stack slot, and a + // declined store hands the bits back. + match unsafe { + inst.split_store_at(idx as usize, std::ptr::read(value), Self::core_droppable) + } { Ok(()) => return true, - Err(v) => std::mem::forget(v), + Err((v, refused)) => { + std::mem::forget(v); + if refused { + return false; + } + } } } } @@ -21430,7 +24157,7 @@ impl Interpreter { let old = std::mem::replace(slot, unsafe { std::ptr::read(value) }); drop(old); if let Some(ext) = ext { - field_slot_note(ext, code.instructions.len(), attr_pc, inst, key_idx); + field_slot_note(ext, code, attr_pc, inst, key_idx); } true } @@ -21438,7 +24165,7 @@ impl Interpreter { Self::core_store_new_attr(code, inst, cls, attr_pc, name_idx, ver, value) } IC::StoreAttrSlot { key_idx, ver } if cls.attr_version.get() == ver => { - Self::core_store_slot(code, inst, key_idx, name_idx, value) + Self::core_store_slot(code, inst, attr_pc, key_idx, name_idx, value) } _ => false, } @@ -21453,6 +24180,7 @@ impl Interpreter { fn core_store_slot( code: &CodeObject, inst: &PyInstance, + attr_pc: usize, key_idx: u32, name_idx: u32, value: &Object, @@ -21472,6 +24200,10 @@ impl Interpreter { let v = unsafe { std::ptr::read(value) }; inst.note_slot_store(&v); drop(std::mem::replace(slot, v)); + drop(slots); + if let Some(ext) = code_vm_ext_existing(code) { + slot_field_note(code, ext, attr_pc, inst, key_idx, name_idx); + } return true; } match slots.get_index_mut(key_idx as usize) { @@ -21539,8 +24271,17 @@ impl Interpreter { attr_pc: usize, cursor: &mut Option, ) -> Option { - let (ver, idx) = ext.field_slots.get()?.get(attr_pc)?.get(); - if inst.cls_raw().attr_version.get() != ver || crate::capi_watchers::dicts_active() { + let (ver, idx) = ext.field_slot(attr_pc)?.get(); + if inst.cls_raw().attr_version.get() != ver { + return None; + } + if idx & SLOT_FIELD != 0 { + // A laid-out member's store, set or not (see `core_store_attr`). + // SAFETY: a read with nothing running (the commit's check pass). + let slot = unsafe { inst.laid_out_slot_any((idx & !SLOT_FIELD) as usize) }?; + return Some(Self::core_droppable(slot)); + } + if crate::capi_watchers::dicts_active() { return None; } // SAFETY: a read with nothing running (the commit's check pass). @@ -21661,7 +24402,7 @@ impl Interpreter { // SAFETY: a read between two instructions. let pos = unsafe { inst.dict.split_peek() }.and_then(|s| s.position(name)); if let Some(pos) = pos.and_then(|p| u32::try_from(p).ok()) { - field_slot_note(ext, code.instructions.len(), attr_pc, inst, pos); + field_slot_note(ext, code, attr_pc, inst, pos); } } return true; @@ -21749,7 +24490,10 @@ impl Interpreter { ) -> Option { use weavepy_compiler::InlineCache as IC; if matches!(code.caches.get(attr_pc as u32), IC::Empty) { - return None; + return match local { + Object::Instance(inst) => inst_dict_attr(code, inst, attr_pc, name_idx), + _ => None, + }; } match local { Object::Instance(i) if i.cls_raw().native_kind.get() == 0 => {} @@ -21802,7 +24546,7 @@ impl Interpreter { return None; }; if Rc::as_ptr(f) as usize != self.leaf_fns().len_ptr - || code.names.get(name_idx as usize).map(String::as_str) != Some("len") + || code.names.get(name_idx as usize).map(|n| n.as_str()) != Some("len") { return None; } @@ -21909,7 +24653,6 @@ impl Interpreter { globals, builtins, rare, - exc: frame_exc, .. } = frame; let code: &CodeObject = code_rc; @@ -22339,7 +25082,7 @@ impl Interpreter { // hand-off cadence, every loop-generation input // (signals, async exceptions, observers, pending // finalizers), and tier-2 heat are all polled here. - if self.gil_countdown <= 1 || crate::hot_gates::loop_gen() != snap_gen { + if self.countdown_out(1) || crate::hot_gates::loop_gen() != snap_gen { stop = LeafStop::Breaker; break; } @@ -22690,10 +25433,15 @@ impl Interpreter { let Some(Object::Str(key)) = code_name_obj(code, ins.arg) else { break; }; - let removed = inst - .dict_cell() - .borrow_mut() - .shift_remove(&DictKey(Object::Str(key.clone()))); + // (The split layout deletes in place; see + // `PyInstance::split_remove`.) + let removed = match inst.split_remove(key) { + Some(removed) => removed, + None => inst + .dict_cell() + .borrow_mut() + .shift_remove(&DictKey(Object::Str(key.clone()))), + }; // A missing attribute raises through the full path. let Some(removed) = removed else { break; @@ -22808,14 +25556,16 @@ impl Interpreter { break; }; let value = stack[n - 1].clone(); - if let Some(slot) = d.get_mut(&probe) { - drop(std::mem::replace(slot, value)); - true - } else if probe.miss_is_exact() { - d.insert(DictKey(key.clone()), value); - true - } else { - false + match d.probe_entry(&probe) { + crate::dictmap::ProbeEntry::Occupied(e) => { + drop(std::mem::replace(e.into_mut(), value)); + true + } + crate::dictmap::ProbeEntry::Vacant(e) if probe.miss_is_exact() => { + e.insert(DictKey(key.clone()), value); + true + } + crate::dictmap::ProbeEntry::Vacant(_) => false, } } _ => false, @@ -23196,19 +25946,20 @@ impl Interpreter { let Ok(mut d) = cell.try_borrow_mut() else { break; }; - let (old, changed) = match d.get_mut(&probe) { - Some(slot) => { + let (old, changed) = match d.probe_entry(&probe) { + crate::dictmap::ProbeEntry::Occupied(e) => { + let slot = e.into_mut(); let v = std::mem::replace(value_slot, Object::Unbound); let old = std::mem::replace(slot, v); let changed = !old.is_same(slot); (old, changed) } - None => { + crate::dictmap::ProbeEntry::Vacant(e) => { if !probe.miss_is_exact() { break; } let v = std::mem::replace(value_slot, Object::Unbound); - d.insert(DictKey(key.clone()), v); + e.insert(DictKey(key.clone()), v); (Object::Unbound, true) } }; @@ -23293,10 +26044,7 @@ impl Interpreter { // pushed in the elided-method shape (function, self) // — the `CALL` folds `self` in — or bound, without the // super proxy the full handler builds. Stack (top- - // down): self, class, global `super`. - if ins.arg & 2 != 0 { - break; - } + // down): self, class, global `super` (either form). let n = stack.len(); if n < 3 || !is_super_callable(&stack[n - 3]) { break; @@ -23705,19 +26453,14 @@ impl Interpreter { break; } let exc = stack.pop().expect("checked above"); - let prev = self - .exc_info_stack - .borrow() - .last() - .map_or(Object::None, |pe| pe.instance.clone()); + let prev = { + let mut handled = self.exc_info_stack.borrow_mut(); + let prev = handled.last().cloned().unwrap_or(Object::None); + handled.push(exc.clone()); + prev + }; stack.push(prev); - stack.push(exc.clone()); - let pe = PyException::new(exc); - frame_exc - .get_or_insert_with(Box::default) - .handlers - .push((ins.arg, pe.clone())); - self.exc_info_stack.borrow_mut().push(pe); + stack.push(exc); last = pc; pc += 1; } @@ -23736,16 +26479,13 @@ impl Interpreter { } OpCode::PopExcept => { let Some(prev) = stack.pop() else { break }; - let popped = frame_exc.as_mut().and_then(|e| e.handlers.pop()); let top = self.exc_info_stack.borrow_mut().pop(); // See the full handler: the handled exception dies // here unless something else holds it. - self.recheck_frame_observed = true; last = pc; pc += 1; - drop(top); - if let Some((_, pe)) = popped { - self.release(pe.instance); + if let Some(top) = top { + self.release(top); } self.release(prev); } @@ -23806,7 +26546,10 @@ impl Interpreter { /// hands the instruction to the full handler (which restarts the scan: /// nothing observable happened here). fn leaf_contains(container: &Object, item: &Object) -> Option { - let member = Self::leaf_member_eq; + if let Some(found) = Self::leaf_contains_table(container, item) { + return Some(found); + } + let member = Self::leaf_contains_eq; match container { Object::List(l) => { // SAFETY: a read between two instructions (the member test @@ -23866,10 +26609,53 @@ impl Interpreter { } found.ok().flatten() } + // A class's `__dict__` view (`'__dict__' in type.__dict__`, as + // `inspect` asks) tests the class dict it wraps. + Object::MappingProxy(d) => Self::leaf_contains(&Object::Dict(d.clone()), item), _ => None, } } + /// [`Self::leaf_contains`]'s commonest tests, small enough to inline + /// into the frame JIT's helper: a `str`, machine `int` or plain class + /// in a set or dict (`cls in _atomic_types`), probed in line. `None` + /// for anything else, or a miss a key of another kind might explain. + #[inline(always)] + pub(crate) fn leaf_contains_table(container: &Object, item: &Object) -> Option { + // A `str`, machine `int` or plain class in a set or dict, the + // commonest tests (`cls in _atomic_types`), probed in line. + if let ( + Object::Set(_) | Object::FrozenSet(_) | Object::Dict(_), + Object::Str(_) | Object::Int(_) | Object::Type(_), + ) = (container, item) + { + let probe = match item { + Object::Type(t) => crate::object::type_hash_is_identity(t) + .then(|| crate::object::LeafProbe::identity_type(item)), + _ => crate::object::LeafProbe::new(item), + }; + if let Some(probe) = probe { + let found = match container { + // SAFETY: a read between two instructions (the probe + // runs no code). + Object::Set(st) => unsafe { st.peek() }.map(|m| m.contains_hot(&probe)), + Object::FrozenSet(fs) => Some(fs.contains_hot(&probe)), + // SAFETY: as above. + Object::Dict(d) => { + unsafe { d.peek() }.map(|m| m.get_index_hot(&probe).is_some()) + } + _ => None, + }; + if let Some(found) = found { + if found || probe.miss_is_exact() { + return Some(found); + } + } + } + } + None + } + /// Whether hashing `item` runs no Python code: a native scalar, a /// class whose metaclass keeps `type`'s `__hash__` and `__eq__`, or an /// instance hashed by identity. (Equality with a stored key that @@ -23928,6 +26714,68 @@ impl Interpreter { None } + /// [`Self::leaf_member_eq`] for a membership test (`in`), which settles + /// a few more pairs itself rather than through a native comparison. + fn leaf_contains_eq(x: &Object, item: &Object) -> Option { + if let Some(eq) = Self::leaf_member_eq(x, item) { + return Some(eq); + } + let scalar = |o: &Object| { + matches!( + o, + Object::None + | Object::Bool(_) + | Object::Int(_) + | Object::Float(_) + | Object::Str(_) + | Object::Bytes(_) + ) + }; + // An `int` subclass's instance under `int`'s own `__eq__` (an + // `IntEnum` or `IntFlag` member) equals what its value equals. + if let (Some(a), Some(b)) = (Self::int_eq_value(x), Self::int_eq_value(item)) { + return Some(a == b); + } + // A function, or a class under `type`'s own `__eq__`, equals + // nothing but itself, against anything whose `__eq__` doesn't + // know it either. + let identity = |o: &Object| match o { + Object::Function(_) => true, + Object::Type(t) => Self::plain_metaclass(t), + _ => false, + }; + // (A builtin function's `__eq__` knows only builtin functions.) + let default_eq = |o: &Object| { + identity(o) + || scalar(o) + || matches!(o, Object::Builtin(_)) + || (matches!(o, Object::Instance(i) if i.native.get().is_none()) + && !crate::object::instance_has_custom_eq(o)) + }; + if (identity(x) && default_eq(item)) || (identity(item) && default_eq(x)) { + return Some(false); + } + None + } + + /// The value `o` compares as under `int.__eq__`: a machine `int` or + /// `bool`, or an instance of an `int` subclass whose `__eq__` is + /// `int`'s own, over a machine `int`. + fn int_eq_value(o: &Object) -> Option { + match o { + Object::Int(i) => Some(*i), + Object::Bool(b) => Some(i64::from(*b)), + Object::Instance(inst) => { + let Some(Object::Int(i)) = inst.native.get() else { + return None; + }; + let eq = inst.cls_raw().dunder(crate::types::Dunder::Eq); + (eq.builtin_owner() && !eq.object_owner()).then_some(*i) + } + _ => None, + } + } + /// `len(v)` for an instance whose class serves `__len__` with a /// registered native leaf builtin (found through the class's leaf /// attribute cache): the length, or `None` for the full path (which @@ -24418,8 +27266,7 @@ impl Interpreter { // Inspect an existing table first. A Python-defined subscript // must not allocate a native cache or pay the temporary probe. let cached = code_vm_ext(code) - .and_then(|ext| ext.method_slots.get()) - .and_then(|slots| slots.get(cache_pc as usize)) + .and_then(|ext| ext.method_slot(cache_pc as usize)) .and_then(|slot| slot.get_native_subscript(version, generation)); let fast = match cached { Some(fast) => { @@ -24485,8 +27332,7 @@ impl Interpreter { let version = cls.attr_version.get(); let generation = leaf_builtins::generation(); let cached = code_vm_ext(code) - .and_then(|ext| ext.method_slots.get()) - .and_then(|slots| slots.get(cache_pc as usize)) + .and_then(|ext| ext.method_slot(cache_pc as usize)) .and_then(|slot| slot.get_native_subscript(version, generation)); if cached.is_some() { return cached; @@ -24683,6 +27529,7 @@ impl Interpreter { ("any", LeafKind::Fast(crate::seqiter::any_fast)), ("all", LeafKind::Fast(crate::seqiter::all_fast)), ("abs", LeafKind::Fast(crate::seqiter::abs_fast)), + ("hash", LeafKind::Fast(crate::seqiter::hash_fast)), ("ord", LeafKind::Fast(crate::seqiter::ord_fast)), ("chr", LeafKind::Fast(crate::seqiter::chr_fast)), ("divmod", LeafKind::Fast(crate::seqiter::divmod_fast)), @@ -24707,6 +27554,7 @@ impl Interpreter { ("__len__", LeafKind::Len), ("append", LeafKind::ListAppend), ("pop", LeafKind::ListPop), + ("extend", LeafKind::ListExtend), ("insert", LeafKind::ListInsert), ("reverse", LeafKind::ListReverse), ("copy", LeafKind::ListCopy), @@ -25249,25 +28097,62 @@ impl Interpreter { /// the default. `None` for anything else (descriptors, dunders, a /// missing attribute's `AttributeError`), which the full call handles. fn leaf_getattr(args: &[Object]) -> Option> { - let (recv, Object::Str(name_obj)) = (args.first()?, args.get(1)?) else { + if args.len() > 3 { + return None; + } + Self::leaf_getattr_parts(args.first()?, args.get(1)?, args.get(2), false).map(Ok) + } + + /// [`Self::leaf_getattr`] on its parts, `default` the third argument's + /// value if any. With `probe` (`hasattr`), the value found matters + /// only as present: a method found to bind is answered with `True` + /// instead of a bound method, and a built-in kind's method (see + /// [`builtins::lookup_method`]) is found without binding it. + fn leaf_getattr_parts( + recv: &Object, + name_arg: &Object, + default: Option<&Object>, + probe: bool, + ) -> Option { + let Object::Str(name_obj) = name_arg else { return None; }; let name: &str = name_obj; - if args.len() > 3 || crate::object::exotic_str_keys_possible() { + if crate::object::exotic_str_keys_possible() { return None; } let inst = match recv { Object::Instance(inst) => inst, // A function's stored attribute (`__doc__` once read, // `__wrapped__`). - Object::Function(f) => return function_stored_attr(f, name_obj).map(Ok), + Object::Function(f) => return function_stored_attr(f, name_obj), + // A plain module's global (`hasattr(os, 'getpid')`): its + // dictionary's value (`ModuleType`'s descriptors are dunders; + // a missing name may reach a module `__getattr__`). + Object::Module(m) + if !name.starts_with("__") && !crate::object::module_classes_possible() => + { + return m.dict.borrow().get(&crate::object::StrKey(name)).cloned(); + } + // A built-in kind's method (`hasattr(stream, "write")`): its + // lookup runs no code, and a found method means the attribute + // is there. + _ if probe + && !name.starts_with('_') + && builtins::method_memo_tag(recv).is_some() + && builtins::lookup_method(recv, name).is_some() => + { + return Some(Object::Bool(true)); + } _ => return None, }; // A dunder nothing supplies (`copy`'s `__deepcopy__` probe): the // default. if name.starts_with("__") { - return (args.len() == 3 && attr_certainly_missing(&args[0], name)) - .then(|| Ok(args[2].clone())); + if let Some(d) = default.filter(|_| attr_certainly_missing(recv, name)) { + return Some(d.clone()); + } + return Self::leaf_builtin_dunder_attr(inst, recv, name); } let cls = inst.cls_raw(); if cls.native_kind.get() != 0 @@ -25295,18 +28180,56 @@ impl Interpreter { return None; } if let Some(v) = inst.attr_get_str(name) { - return Some(Ok(v)); + return Some(v); } - Some(Ok(match on_class { + Some(match on_class { + Some(Object::Function(_)) if probe => Object::Bool(true), Some(f @ Object::Function(_)) => { - Object::BoundMethod(Rc::new(BoundMethod::new(args[0].clone(), f))) + Object::BoundMethod(Rc::new(BoundMethod::new(recv.clone(), f))) } Some(v) => v, - None if args.len() == 3 && !cls.dunder(crate::types::Dunder::GetAttr).present() => { - args[2].clone() + None if default.is_some() && !cls.dunder(crate::types::Dunder::GetAttr).present() => { + default?.clone() } None => return None, - })) + }) + } + + /// A dunder a plain instance gets from a builtin method on its class + /// (`obj.__reduce_ex__`, which `copy` fetches): what + /// `load_attr_instance_default` resolves for it (an instance-dict + /// entry, else the method bound to `obj`), or `None` for any shape + /// that path treats specially. + fn leaf_builtin_dunder_attr(inst: &PyInstance, recv: &Object, name: &str) -> Option { + let cls = inst.cls_raw(); + if cls.native_kind.get() != 0 + || inst.native.get().is_some() + || inst.c_body.get() != 0 + || !Self::default_getattribute(cls) + || cls.dunder(crate::types::Dunder::GetAttr).present() + || cls.is_super_proxy_type() + { + return None; + } + let Some(Object::Builtin(b)) = cls.lookup(name) else { + return None; + }; + // (A weak proxy forwards these names to its referent.) + if matches!( + name, + "__reduce_ex__" | "__reduce__" | "__copy__" | "__deepcopy__" | "__getstate__" + ) && crate::stdlib::weakref_real::proxy_referent(recv).is_some() + { + return None; + } + if let Some(v) = inst.attr_get_str(name) { + return Some(v); + } + Some(if b.binds_instance { + Object::BoundMethod(Rc::new(BoundMethod::new(recv.clone(), Object::Builtin(b)))) + } else { + Object::Builtin(b) + }) } /// `hasattr(obj, name)` decided as [`Self::leaf_getattr`] decides @@ -25317,11 +28240,9 @@ impl Interpreter { let [obj, name] = args else { return None; }; - let probe = [obj.clone(), name.clone(), Object::Unbound]; - match Self::leaf_getattr(&probe)? { - Ok(Object::Unbound) => Some(Ok(Object::Bool(false))), - Ok(_) => Some(Ok(Object::Bool(true))), - Err(_) => None, + match Self::leaf_getattr_parts(obj, name, Some(&Object::Unbound), true)? { + Object::Unbound => Some(Ok(Object::Bool(false))), + _ => Some(Ok(Object::Bool(true))), } } @@ -25400,6 +28321,13 @@ impl Interpreter { }); } K::ListInsert => args.len() == 3 && matches!(args[0], O::List(_)) && leaf_int(&args[1]), + // An exact list's or tuple's items, snapshotted: no iteration + // hook runs. + K::ListExtend => { + args.len() == 2 + && matches!(args[0], O::List(_)) + && matches!(args[1], O::List(_) | O::Tuple(_)) + } K::ListReverse | K::ListCopy => args.len() == 1 && matches!(args[0], O::List(_)), // Admitted when every comparison `list.remove` makes up to its // match (or to the end: the ValueError) runs no Python code. @@ -25690,7 +28618,14 @@ impl Interpreter { .filter(|(key, _)| slot_name_matches(code, name_idx, key)) .map(|(_, value)| value); match indexed { - Some(v) => Some(Self::clone_operand(v)), + Some(v) => { + let v = Self::clone_operand(v); + drop(slots); + if let Some(ext) = code_vm_ext_existing(code) { + slot_field_note(code, ext, cache_pc as usize, inst, key_idx, name_idx); + } + Some(v) + } None => slots .get(code.names.get(name_idx as usize)?.as_str()) .map(Self::clone_operand), @@ -25826,10 +28761,7 @@ impl Interpreter { receiver: &Object, depth: usize, ) -> Option { - let slot = code_vm_ext(code)? - .method_slots - .get()? - .get(cache_pc as usize)?; + let slot = code_vm_ext(code)?.method_slot(cache_pc as usize)?; let cls = inst.cls_raw(); // SAFETY: GIL-serialized (the caller declines free threading); the // getter evaluation runs no Python, so nothing rebinds either. @@ -25916,6 +28848,9 @@ impl Interpreter { return Some(v); } } + if let Some(v) = inst_dict_attr(code, inst, cache_pc as usize, name_idx) { + return Some(v); + } match Self::leaf_resolve_instance_attr_ix(code, inst, name_idx)? { (LeafAttr::Value(v), ix) => { if let Some(ix) = ix { @@ -25998,9 +28933,12 @@ impl Interpreter { // `__getattribute__` (a `super` proxy resolves `__init__` in the // MRO *after* its own class), where the class-MRO answer the // class cache holds would be wrong. `__new__` keeps its historic - // exception. + // exception, except through a `super` proxy. let name = code.names.get(name_idx as usize)?; - if name.len() > 4 && name.starts_with("__") && name != "__new__" { + if name.len() > 4 + && name.starts_with("__") + && (name != "__new__" || cls.is_super_proxy_type()) + { return None; } let on_class = match Self::leaf_class_attr(code, cls, name_idx)? { @@ -26269,7 +29207,8 @@ impl Interpreter { .is_some_and(|n| n == "__doc__") { let plain = |v: Option<&Object>| matches!(v, Some(Object::Str(_) | Object::None)); - let key = crate::object::StrKey("__doc__"); + // (The site's name, hashed once.) + let key = code_name_key(code, name_idx)?; if !Self::plain_metaclass(cls) { // SAFETY: GIL-serialized raw read, as in `plain_metaclass`. let meta = unsafe { (*cls.metaclass.as_ptr()).as_ref() }?; @@ -26309,17 +29248,31 @@ impl Interpreter { } // A builtin class's native class method (`int.from_bytes`), bound // to the class as `classmethod.__get__` binds it. - if cls.flags.is_builtin { - let name = code.names.get(name_idx as usize)?; - let d = cls.dict.try_borrow().ok()?; - if let Some(Object::ClassMethod(cm)) = d.get(&crate::object::StrKey(name)) { - let f = cm.func(); - return matches!(f, Object::Builtin(_)).then(|| { - Object::BoundMethod(Rc::new(BoundMethod::py_method( - Object::Type(cls.clone()), - f, - ))) - }); + // (Most names are none: the class remembers which, sparing the + // probe's hashing.) + let name = code.names.get(name_idx as usize)?; + if cls.flags.is_builtin + && !cls.memo_verdict(crate::types::Verdict::NoNativeClassMethod, name, || { + cls.dict.try_borrow().is_ok_and(|d| { + !matches!( + d.get(&crate::object::StrKey(name)), + Some(Object::ClassMethod(_)) + ) + }) + }) + { + // (Through the type cache: the class's own entry is the one + // its MRO walk finds first.) + if let Some((Object::ClassMethod(cm), owner)) = cls.lookup_with_owner(name) { + if Rc::ptr_eq(&owner, cls) { + let f = cm.func(); + return matches!(f, Object::Builtin(_)).then(|| { + Object::BoundMethod(Rc::new(BoundMethod::py_method( + Object::Type(cls.clone()), + f, + ))) + }); + } } } match Self::leaf_class_attr(code, cls, name_idx)? { @@ -26451,10 +29404,24 @@ impl Interpreter { let Object::Type(cls) = class_obj else { return None; }; - let Object::Instance(inst) = self_obj else { - return None; + // The receiver's class, whose MRO `super()` walks. A class + // receiver that is an instance of `cls` (a metaclass method's + // `super().__setattr__(...)`) binds like any instance, through + // its metaclass; one that is a subclass of `cls` (a class method, + // `__new__`) binds unlike one and stays on the full path. + let meta_holder; + let recv_cls: &TypeObject = match self_obj { + Object::Instance(inst) => inst.cls_raw(), + Object::Type(k) => { + if k.is_subclass_of(cls) { + return None; + } + // SAFETY: GIL-serialized raw read, as in `plain_metaclass`. + meta_holder = unsafe { (*k.metaclass.as_ptr()).clone() }?; + &meta_holder + } + _ => return None, }; - let recv_cls = inst.cls_raw(); let ver = recv_cls.attr_version.get(); let cls_id = Rc::as_ptr(cls) as usize as u64; let slot = code_method_slot(code, cache_pc); @@ -26475,9 +29442,14 @@ impl Interpreter { _ => {} } let name = code.names.get(name_idx as usize)?; - if name.starts_with("__") && name != "__init__" { + // `super().__class__` is the proxy's own attribute. + if name == "__class__" { return None; } + // A built-in class can serve a dunder from outside its dict (a + // slot wrapper the full lookup synthesizes): a dunder's walk may + // not pass one by. + let dunder = name.starts_with("__") && name != "__init__"; // (The receiver's metaclass takes no part: `super()` reads the // dicts along its stored MRO, which a custom `mro()` produced.) let mro = recv_cls.mro.try_borrow().ok()?; @@ -26490,9 +29462,16 @@ impl Interpreter { } let d = owner.dict.try_borrow().ok()?; if let Some(v) = d.get(&key) { + // (An introspection-only entry is invisible to dispatch.) + if owner.flags.is_builtin && crate::descr_registry::is_surface_only(v) { + return None; + } found = Some(v.clone()); break; } + if dunder && owner.flags.is_builtin { + return None; + } } match found? { Object::Function(f) => { @@ -26658,22 +29637,27 @@ impl Interpreter { // establishes, read from the class's own caches). _ => { let cls = inst.cls_raw(); - if !Self::default_getattribute(cls) - || cls.flags.is_builtin - || !cls.setattr_is_default() - || cls.forbids_dict - || crate::object::exotic_str_keys_possible() - || (name.starts_with("__") && name != "__doc__") - // An exception's `args` is a `BaseException` - // descriptor. - || (name == "args" - && cls.is_subclass_of(&builtin_types().base_exception)) + if crate::object::exotic_str_keys_possible() || inst.c_body.get() != 0 - || !matches!( - cls.lookup(name), - None | Some(Object::Function(_) | Object::Str(_) | Object::None) - ) || crate::capi_watchers::dicts_active() + // (The class's part, settled per class version.) + || !cls.memo_verdict(crate::types::Verdict::PlainStore, name, || { + Self::default_getattribute(cls) + && !cls.flags.is_builtin + && cls.setattr_is_default() + && !cls.forbids_dict + && !(name.starts_with("__") && name != "__doc__") + // An exception's `args` is a + // `BaseException` descriptor. + && !(name == "args" + && cls.is_subclass_of(&builtin_types().base_exception)) + && matches!( + cls.lookup(name), + None | Some( + Object::Function(_) | Object::Str(_) | Object::None + ) + ) + }) { return None; } @@ -29686,12 +32670,13 @@ impl Interpreter { // (`sys.exc_info()`), not frame-local: a helper // called from inside an `except:` block can // re-raise the caller's exception. - let mut top = self + let top = self .exc_info_stack .borrow() .last() .cloned() .ok_or_else(|| runtime_error("No active exception to re-raise"))?; + let mut top = PyException::new(top); top.suppress_tb_once = true; top.context_settled = true; return Err(RuntimeError::PyException(top)); @@ -29844,12 +32829,8 @@ impl Interpreter { // `raise`'s `__context__` see the match, not the whole // group, with no per-clause PUSH_EXC_INFO on the wire. if !matches!(matched, Object::None) { - let pe = PyException::new(matched.clone()); if let Some(top) = self.exc_info_stack.borrow_mut().last_mut() { - *top = pe.clone(); - } - if let Some(top) = frame.exc.as_mut().and_then(|e| e.handlers.last_mut()) { - top.1 = pe; + *top = matched.clone(); } } frame.push(rest); @@ -29867,22 +32848,12 @@ impl Interpreter { .exc_info_stack .borrow() .last() - .map(|pe| pe.instance.clone()) + .cloned() .unwrap_or(Object::None); frame.push(prev); frame.push(exc.clone()); if let Object::Instance(_) = &exc { - let pe = PyException::new(exc); - // `ins.arg` is the pc just past this handler body - // (back-patched by the compiler). Tag the entry so - // the unwinder can drop it when an exception escapes - // the handler to an enclosing `try`. A 0 arg means - // the code carries no tag (e.g. older marshalled - // bytecode); leave it untagged and let frame-exit - // reconciliation handle any residue. - let body_end = ins.arg; - frame.exc_mut().handlers.push((body_end, pe.clone())); - self.exc_info_stack.borrow_mut().push(pe); + self.exc_info_stack.borrow_mut().push(exc); } } OpCode::PopExcept => { @@ -29892,15 +32863,13 @@ impl Interpreter { // `sys.exc_info()` restore, so the value itself is // discarded). let _prev = frame.pop()?; - let popped = frame.exc_handlers_pop(); - drop(self.exc_info_stack.borrow_mut().pop()); + let popped = self.exc_info_stack.borrow_mut().pop(); // CPython clears the just-handled exception at the end of an // `except` block (the implicit `del` of the bound name plus // the per-frame exc-state pop): it dies here unless something // else holds it. - self.recheck_frame_observed = true; - if let Some((_, pe)) = popped { - self.release(pe.instance); + if let Some(popped) = popped { + self.release(popped); } } OpCode::PrepReraiseStar => { @@ -29973,7 +32942,7 @@ impl Interpreter { .lasti .store(orig, std::sync::atomic::Ordering::Relaxed); if let Some(py_frame) = shell.materialized.borrow().as_ref() { - py_frame.lasti.set(orig); + py_frame.set_lasti(orig); } } } @@ -30349,7 +33318,7 @@ impl Interpreter { // Keep the in-flight traceback so the RuntimeError // points at the offending frame; chain the original // as cause + context (PEP 479 wording). - new_exc.traceback = orig.traceback.clone(); + new_exc.traced = orig.traced; new_exc.cause = Some(Box::new(orig.clone())); new_exc.context = Some(Box::new(orig)); new_exc.context_settled = true; @@ -30738,7 +33707,7 @@ impl Interpreter { let fresh = !exc.context_settled && exc.context.is_none() && exc.cause.is_none() - && exc.traceback.is_empty() + && !exc.traced && !exc.suppress_tb_once; // Nothing is being handled: there is no context to chain (the // decision `attach_implicit_context` would settle the same way), @@ -30752,7 +33721,7 @@ impl Interpreter { if exc.context.is_some() { Self::sync_exc_attrs(exc); } - } else if exc.traceback.is_empty() && (exc.cause.is_some() || exc.context.is_some()) { + } else if !exc.traced && (exc.cause.is_some() || exc.context.is_some()) { // A fresh Rust-raised error that already carries an // explicit `cause`/`context` (e.g. `_io` chaining a // misbehaving raw `readinto`'s `TypeError` into an @@ -30799,6 +33768,44 @@ impl Interpreter { } } + /// Whether a quiet loop's return from an activation with `shell` may + /// skip the general loop: nothing the full epilogue acts on (no frame + /// object, no handled-exception entries left above `exc_depth`), or + /// no observer for its `'return'` events (the epilogue's object + /// settling and stack reconciling then run here, see + /// [`Self::finish_quiet_return`]). A `sys._getframe` handle, or a + /// frame object some traceback entry built, no longer sends the + /// return through the general loop. + #[inline] + fn return_settles_quietly(&self, shell: &crate::object::FrameShell, exc_depth: usize) -> bool { + (!shell + .has_materialized + .load(std::sync::atomic::Ordering::Relaxed) + && self.exc_info_len() <= exc_depth) + || !crate::trace::any_observers_active() + } + + /// `run_activation`'s epilogue for a normal return of an ordinary + /// activation that [`Self::return_settles_quietly`] accepted: pop its + /// shell, settle its frame object, drop the handled-exception entries + /// it left, park the shell. + #[inline(never)] + fn finish_quiet_return( + &mut self, + frame: &Frame, + shell: Rc, + exc_depth: usize, + ) { + self.pop_frame_shell(); + // A lazy traceback entry still holding the shell had its frame + // object built by the pop. + Self::settle_exited_frame_object(&shell, frame, true); + if self.exc_info_len() > exc_depth { + self.exc_info_stack.borrow_mut().truncate(exc_depth); + } + self.recycle_frame_shell(shell); + } + /// The general loop's unwind of an inline activation that `exc` /// leaves, when nothing observes the frame and no handler in it covers /// the raise (see `quiet_catch`): this frame's traceback entry, then @@ -30847,12 +33854,10 @@ impl Interpreter { frame: &Frame, cur_pc: usize, ) { - if shell.tb_refs.load(std::sync::atomic::Ordering::Relaxed) != 0 { - // See `sync_lazy_tb_lasti`. - shell - .lasti - .store(cur_pc as u32, std::sync::atomic::Ordering::Relaxed); - } + // See `sync_lazy_tb_lasti`. + shell + .lasti + .store(cur_pc as u32, std::sync::atomic::Ordering::Relaxed); self.pop_frame_shell(); Self::settle_exited_frame_object(&shell, frame, true); self.recycle_frame_shell(shell); @@ -30969,15 +33974,10 @@ impl Interpreter { } /// Push one frame's worth of `tb_*` info onto the exception's - /// traceback chain — both the legacy `Vec` (used - /// for the cheap `RuntimeError` Display impl) and the new - /// `PyTraceback` chain stored on the instance dict so Python code - /// can walk `exc.__traceback__`. + /// traceback: the `PyTraceback` chain stored on the instance so + /// Python code can walk `exc.__traceback__`. fn append_traceback(&self, exc: &mut PyException, frame: &mut Frame, lasti: u32, lineno: u32) { - exc.push_traceback(TracebackEntry { - code: frame.code.clone(), - lineno, - }); + exc.traced = true; // The Python-visible frame for this entry must be *this* frame's // snapshot. Generator-family frames cache theirs (stable identity // across resumes) but are not necessarily on `frame_stack` when an @@ -31034,7 +34034,7 @@ impl Interpreter { // Cache it on generator-family frames so // `gi_frame` keeps a stable identity. let py = self.build_py_frame(frame, None); - py.lasti.set(lasti); + py.set_lasti(lasti); if frame.code.is_generator || frame.code.is_coroutine || frame.code.is_async_generator @@ -31059,12 +34059,17 @@ impl Interpreter { let new_tb = Object::Traceback(new_tb); inst.note_slot_store(&new_tb); let mut slots = inst.slots.borrow_mut(); - match slots.get_mut("__traceback__") { + match slots.exc_tail_place(crate::types::ExcTail::Traceback) { Some(slot) => { let prev = std::mem::replace(slot, new_tb); - if let (Object::Traceback(prev_tb), Object::Traceback(head)) = (&prev, &*slot) { - *head.next.borrow_mut() = Some(prev_tb.clone()); - } + // The chain so far moves under the new head. + let prev = match (prev, &*slot) { + (Object::Traceback(prev_tb), Object::Traceback(head)) => { + *head.next.borrow_mut() = Some(prev_tb); + None + } + (prev, _) => Some(prev), + }; drop(slots); drop(prev); } @@ -31104,7 +34109,7 @@ impl Interpreter { let new_tb = Rc::new(PyTraceback::new( py_frame.clone(), py_frame.last_line.get().unwrap_or(1), - py_frame.lasti.get(), + py_frame.lasti_now(), None, )); inst.slot_set("__traceback__", Object::Traceback(new_tb)); @@ -31129,7 +34134,7 @@ impl Interpreter { let Some(ctx) = stack.last() else { return; }; - let Object::Instance(ctx_inst) = &ctx.instance else { + let Object::Instance(ctx_inst) = ctx else { return; }; let Object::Instance(exc_inst) = &exc.instance else { @@ -31146,7 +34151,7 @@ impl Interpreter { // first so traceback walkers can't loop. CPython does the same // before assigning the new `__context__`. Self::break_implicit_context_cycle(ctx_inst, exc_inst); - exc.context = Some(Box::new(ctx.clone())); + exc.context = Some(Box::new(PyException::new(ctx.clone()))); } /// Chain an exception injected by `gen.throw()` to whatever the @@ -31160,7 +34165,7 @@ impl Interpreter { let Some(active) = frame.saved_exc_info_last() else { return; }; - let Object::Instance(active_inst) = &active.instance else { + let Object::Instance(active_inst) = active else { return; }; let Object::Instance(exc_inst) = &exc.instance else { @@ -31170,7 +34175,7 @@ impl Interpreter { return; } Self::break_implicit_context_cycle(active_inst, exc_inst); - exc.context = Some(Box::new(active.clone())); + exc.context = Some(Box::new(PyException::new(active.clone()))); // Mirror onto the instance dict so Python's `e.__context__` sees // it (the throw path doesn't go through `RAISE_VARARGS`, which is // where `sync_exc_attrs` normally runs). @@ -31226,14 +34231,15 @@ impl Interpreter { /// `False`), so only real values need storing. fn sync_exc_attrs(exc: &PyException) { if let Object::Instance(inst) = &exc.instance { + use crate::types::ExcTail; if let Some(cause) = exc.cause.as_ref() { - inst.slot_set("__cause__", cause.instance.clone()); + drop(inst.exc_tail_set(ExcTail::Cause, cause.instance.clone())); // Explicit cause suppresses __context__ rendering by // default; user code can still set __suppress_context__. - inst.slot_set("__suppress_context__", Object::Bool(true)); + drop(inst.exc_tail_set(ExcTail::SuppressContext, Object::Bool(true))); } if let Some(context) = exc.context.as_ref() { - inst.slot_set("__context__", context.instance.clone()); + drop(inst.exc_tail_set(ExcTail::Context, context.instance.clone())); } } } @@ -31323,8 +34329,17 @@ impl Interpreter { if matches!(c, Object::None) { pe.cause = None; if let Object::Instance(ref inst_rc) = pe.instance { - inst_rc.slot_set("__cause__", Object::None); - inst_rc.slot_set("__suppress_context__", Object::Bool(true)); + use crate::types::ExcTail; + // An unset `__cause__` already reads None (a re-raised + // instance's earlier cause is cleared). + let earlier = inst_rc + .slots + .borrow_mut() + .exc_tail_place(ExcTail::Cause) + .filter(|cause| !matches!(cause, Object::Unbound)) + .map(|cause| std::mem::replace(cause, Object::None)); + drop(earlier); + drop(inst_rc.exc_tail_set(ExcTail::SuppressContext, Object::Bool(true))); } } else { let cpe = Self::normalize_exception(c, None)?; @@ -31423,10 +34438,19 @@ impl Interpreter { // ---------- helpers ---------- + /// [`Self::name_at`] without the copy, for a caller that keeps the + /// code alive across the use. + fn name_ref(code: &CodeObject, arg: u32) -> Result<&str, RuntimeError> { + code.names + .get(arg as usize) + .map(|n| n.as_str()) + .ok_or_else(|| RuntimeError::Internal("bad name index".to_owned())) + } + fn name_at(&self, code: &CodeObject, arg: u32) -> Result { code.names .get(arg as usize) - .cloned() + .map(|n| n.to_string()) .ok_or_else(|| RuntimeError::Internal("bad name index".to_owned())) } @@ -31624,6 +34648,18 @@ impl Interpreter { /// The dict-subclass instance registered (by `exec`/`eval`) as the /// owner of `globals`, if any. fn globals_missing_owner(&self, globals: &Rc>) -> Option { + // While the gate is up every builtin `LOAD_GLOBAL` asks here, and + // a program that runs no finalizers may never drain them to notice + // the last owner die: every so often, have the next safe point + // drain and prune (see `prune_globals_missing_hooks_sometimes`). + let n = self.globals_missing_asks.get(); + if n >= 1024 { + self.globals_missing_asks.set(0); + self.globals_missing_prune_in.set(0); + gc_trace::mark_maybe_dead(); + } else { + self.globals_missing_asks.set(n + 1); + } let hooks = self.globals_missing_hooks.borrow(); if hooks.is_empty() { return None; @@ -31702,10 +34738,41 @@ impl Interpreter { // the dict, and this table's for the instance. Rc::strong_count(d) > 1 || Rc::strong_count(inst) > 1 }); + // With no owner left, builtin lookups take their fast paths again + // (a `@dataclass` whose annotations needed `annotationlib`'s + // `_StringifierDict` set the gate for good otherwise). + self.globals_missing_any.set(!hooks.is_empty()); + } + + /// [`Self::prune_globals_missing_hooks`] every 64th finalizer drain + /// while the gate is set: owners die when the `exec`/`eval` or + /// function that used them is done, with nothing to notice. + #[cold] + #[inline(never)] + fn prune_globals_missing_hooks_sometimes(&self) { + let n = self.globals_missing_prune_in.get(); + if n > 0 { + self.globals_missing_prune_in.set(n - 1); + return; + } + self.globals_missing_prune_in.set(63); + self.prune_globals_missing_hooks(); } fn load_attr(&mut self, obj: &Object, name: &str) -> Result { let result = self.load_attr_inner(obj, name); + self.load_attr_finish(obj, name, result) + } + + /// The end of [`Self::load_attr`] for the per-variant lookup's + /// `result`: the slot-wrapper rescue, and an `AttributeError`'s + /// `name`/`obj` context. + fn load_attr_finish( + &mut self, + obj: &Object, + name: &str, + result: Result, + ) -> Result { // CPython's `object.__getattribute__` final step: after the // per-variant lookup misses, resolve the name through // `type(obj)`'s MRO slot-wrapper table and bind it @@ -31782,6 +34849,9 @@ impl Interpreter { if self.is_attribute_error(err) { if let RuntimeError::PyException(pe) = err { if let Object::Instance(inst) = &pe.instance { + if attr_error_context_laid_out(inst, obj, name) { + return result; + } let need = matches!( crate::builtin_types::exc_attr(inst, "name"), None | Some(Object::None) @@ -31870,7 +34940,7 @@ impl Interpreter { // Currently executing (illegal to re-enter)? "running" => { return Ok(Object::Bool(matches!( - &*g.state.borrow(), + &*g.state().borrow(), GeneratorState::Running | GeneratorState::Delegating(_) ))) } @@ -31879,14 +34949,14 @@ impl Interpreter { "frame" => { // A collapsed chain's generator gets its spine // entry first, as an executing frame has one. - if matches!(&*g.state.borrow(), GeneratorState::Delegating(_)) { + if matches!(&*g.state().borrow(), GeneratorState::Delegating(_)) { self.flush_pending_callers(); } return Ok(self.gen_py_frame(g)); } "suspended" => { return Ok(Object::Bool(matches!( - &*g.state.borrow(), + &*g.state().borrow(), GeneratorState::Suspended(_) ))) } @@ -32613,7 +35683,7 @@ impl Interpreter { // lineno_matches_lasti at the exec 'call' event). let line = fr.current_lineno(); if line == 0 { - let at_module_resume = fr.lasti.get() == 0 + let at_module_resume = fr.lasti_now() == 0 && fr.code.name == "" && fr.code.instructions.first().map(|x| x.op) == Some(weavepy_compiler::bytecode::OpCode::Resume); @@ -32633,7 +35703,7 @@ impl Interpreter { } } "f_lasti" => Ok(Object::Int(i64::from( - fr.code.cpython_lasti(fr.lasti.get()), + fr.code.cpython_lasti(fr.lasti_now()), ))), "f_back" => { // A generator-family frame drops its resumer link when @@ -33566,6 +36636,17 @@ impl Interpreter { Rc::strong_count(inst), ); } + // `inst.__class__` (`_abc_instancecheck`, `isinstance` misses, + // `copy`): `object`'s descriptor answering the class, when nothing + // on the MRO overrides `__class__` or `__getattribute__` (a + // builtin class's instances, weak proxies among them, keep the + // full lookup). + if name == "__class__" && inst.c_body.get() == 0 { + let cls = inst.cls(); + if !cls.flags.is_builtin && cls.class_attr_is_plain() { + return Ok(Object::Type(cls)); + } + } let result = if let Some(getattribute) = self.user_getattribute(&inst.cls()) { // `dispatch` (not `new`): a `__getattribute__` that is itself a // descriptor (`__getattribute__ = SomeDescriptor()`) must have @@ -33582,31 +36663,56 @@ impl Interpreter { &self.builtins.clone(), ) } else { + // The default lookup would only raise for the hook to catch: + // call the hook without building that `AttributeError` (CPython's + // `slot_tp_getattr_hook` suppresses it the same way). + let hook = inst.cls().dunder(crate::types::Dunder::GetAttr).present(); + if hook && default_lookup_misses(instance_obj, name, true) { + if let Some(getattr) = inst.cls().lookup("__getattr__") { + return self.call_getattr_hook(instance_obj, getattr, name); + } + } self.load_attr_instance_default(inst, instance_obj, name) }; match result { Err(e) if self.is_attribute_error(&e) => { - if let Some(getattr) = inst.cls().lookup("__getattr__") { - // `dispatch` so a descriptor `__getattr__` also honours - // its `__get__` (test_descr test_getattr_hooks). - let bound = Object::BoundMethod(Rc::new(BoundMethod::dispatch( - instance_obj.clone(), - getattr, - ))); - self.call( - &bound, - &[Object::from_str(name)], - &[], - &self.builtins.clone(), - ) - } else { - Err(e) + // (The memoized answer first: most classes have no hook.) + let cls = inst.cls(); + let hook = cls.dunder(crate::types::Dunder::GetAttr).present(); + match hook.then(|| cls.lookup("__getattr__")).flatten() { + Some(getattr) => self.call_getattr_hook(instance_obj, getattr, name), + None => Err(e), } } other => other, } } + /// `type(obj).__getattr__(obj, name)`, the hook `getattr` resolved. + fn call_getattr_hook( + &mut self, + instance_obj: &Object, + getattr: Object, + name: &str, + ) -> Result { + // A plain function binds the instance as its first argument. + if let Object::Function(f) = &getattr { + return self.call_python(f, &[instance_obj.clone(), Object::from_str(name)], &[]); + } + // `dispatch` so a descriptor `__getattr__` also honours its + // `__get__` (test_descr test_getattr_hooks). + let bound = Object::BoundMethod(Rc::new(BoundMethod::dispatch( + instance_obj.clone(), + getattr, + ))); + self.call( + &bound, + &[Object::from_str(name)], + &[], + &self.builtins.clone(), + ) + } + /// A user-defined `__getattribute__` override, if any. Returns `None` /// when the class uses the default `object.__getattribute__` (resolved as /// the `.object_getattribute` sentinel installed on `object`). @@ -33737,7 +36843,10 @@ impl Interpreter { frame: &mut Frame, arg: u32, ) -> Result, RuntimeError> { - if arg & 2 != 0 || crate::trace::any_observers_active() { + // (Both forms: the explicit `super(C, obj)` puts its arguments + // where the implicit one puts the `__class__` cell and the first + // argument, and CPython specializes either.) + if crate::trace::any_observers_active() { return Ok(None); } let n = frame.stack.len(); @@ -34840,13 +37949,19 @@ impl Interpreter { None if slot.default.is_some() => Ok(slot.default.clone().unwrap()), // CPython's member descriptor reports the // owning type's *fully qualified* name here - // (e.g. `pkg.mod.Cls`), unlike the generic - // "has no attribute" path which uses `tp_name`. - None => Err(attribute_error(format!( - "'{}' object has no attribute '{}'", - inst.cls().qualified_display_name(), - slot.name - ))), + // (`%T`: e.g. `pkg.mod.Cls`, but `Cls` in + // `__main__`), unlike the generic "has no + // attribute" path which uses `tp_name`. + None => { + let ty = inst.cls().fully_qualified_name(); + let mut msg = String::with_capacity(ty.len() + slot.name.len() + 30); + msg.push('\''); + msg.push_str(&ty); + msg.push_str("' object has no attribute '"); + msg.push_str(&slot.name); + msg.push('\''); + Err(attribute_error(msg)) + } } } _ => Err(type_error("slot descriptor requires an instance")), @@ -37165,7 +40280,7 @@ impl Interpreter { None => Ok(default.expect("checked above")), } } - Object::Generator(g) => self.generator_send(g, Object::None), + Object::Generator(g) => self.generator_next_raw(g, false), Object::Coroutine(_) => match self.gen_method_send(it, Object::None) { Ok(v) => Ok(v), Err(RuntimeError::PyException(exc)) if exc.type_name() == "StopIteration" => { @@ -37558,7 +40673,7 @@ impl Interpreter { let mut out = Vec::new(); if !self.seq_drain(l, &mut out, globals)? { loop { - if let Some(r) = crate::seqiter::lazy_pure_next(l) { + if let Some(r) = self.lazy_core_next(l) { match r { Some(x) => out.push(x), None => break, @@ -37708,7 +40823,13 @@ impl Interpreter { // instead of materializing the whole sequence first; CPython's // `builtin_sum_impl` is exactly this drive loop. let mut total = SumState::new(acc); - if let Object::Generator(g) = &args[0] { + // (An iterable whose `__iter__` is a generator function, as a tree + // walked by `yield from`, drains the same way.) + let iter = match &args[0] { + Object::Generator(_) => args[0].clone(), + other => self.make_iter(other, globals)?, + }; + if let Object::Generator(g) = &iter { loop { // A lean resume folds scalar yields straight into `total` // (see `Interpreter::sum_fold`); it returns at the first @@ -37723,7 +40844,6 @@ impl Interpreter { } // Stream the live iterator. Addition can mutate the source or // raise, so don't consume later elements or request a length hint. - let iter = self.make_iter(&args[0], globals)?; while let Some(x) = self.iter_next(&iter, globals)? { total.add(self, x)?; } @@ -38011,8 +41131,12 @@ impl Interpreter { } // Only `Instance`s can carry a custom `__class__`; for every other // object the real type *is* `__class__`, so skip the (observable) - // attribute access on the negative path. - if let Object::Instance(_) = obj { + // attribute access on the negative path. So is it for an instance + // whose class overrides neither `__class__` nor `__getattribute__`. + if let Object::Instance(inst) = obj { + if inst.cls().class_attr_is_plain() { + return Ok(Object::Bool(false)); + } match self.load_attr(obj, "__class__") { Ok(Object::Type(c)) => { if !Rc::ptr_eq(&c, &real) && c.is_subclass_of(cls) { @@ -38510,7 +41634,7 @@ impl Interpreter { args: &[Object], _globals: &Rc>, ) -> Result { - let name = match attr_name_arg(args.get(1)) { + let name = match attr_name_cow(args.get(1)) { Some(n) => n, None => { return Err(type_error(format!( @@ -38532,12 +41656,26 @@ impl Interpreter { ))), }; } - if args.len() >= 3 && attr_certainly_missing(&args[0], &name) { + if args.len() < 3 { + return self.load_attr(&args[0], &name); + } + if attr_certainly_missing(&args[0], &name) { return Ok(args[2].clone()); } + let value_class = builtin_value_class(&args[0]); + if let Some(c) = &value_class { + if c.verdict_cached(crate::types::Verdict::ValueAttrMissing, &name) == Some(true) { + return Ok(args[2].clone()); + } + } match self.load_attr(&args[0], &name) { Ok(v) => Ok(v), - Err(e) if args.len() >= 3 && self.is_attribute_error(&e) => Ok(args[2].clone()), + Err(e) if self.is_attribute_error(&e) => { + if let Some(c) = value_class { + c.verdict_record(crate::types::Verdict::ValueAttrMissing, &name, true); + } + Ok(args[2].clone()) + } Err(e) => Err(e), } } @@ -38551,7 +41689,7 @@ impl Interpreter { args: &[Object], _globals: &Rc>, ) -> Result { - let name = match attr_name_arg(args.get(1)) { + let name = match attr_name_cow(args.get(1)) { Some(n) => n, None => { return Err(type_error(format!( @@ -38568,22 +41706,32 @@ impl Interpreter { if attr_certainly_missing(&args[0], &name) { return Ok(Object::Bool(false)); } - let immutable_type = match &args[0] { - Object::Type(t) if t.flags.is_builtin && !crate::stdlib::os::is_struct_seq_type(t) => { - Some(t) - } + // A builtin class's miss, remembered per class version (a + // struct-sequence class, whose attributes can be set, moves its + // version when they are). + let builtin_type = match &args[0] { + Object::Type(t) if t.flags.is_builtin => Some(t), _ => None, }; - if let Some(t) = immutable_type { - if builtin_type_misses::contains(t, &name) { + if let Some(t) = builtin_type { + if t.verdict_cached(crate::types::Verdict::TypeAttrMissing, &name) == Some(true) { + return Ok(Object::Bool(false)); + } + } + let value_class = builtin_value_class(&args[0]); + if let Some(c) = &value_class { + if c.verdict_cached(crate::types::Verdict::ValueAttrMissing, &name) == Some(true) { return Ok(Object::Bool(false)); } } match self.load_attr(&args[0], &name) { Ok(_) => Ok(Object::Bool(true)), Err(e) if self.is_attribute_error(&e) => { - if let Some(t) = immutable_type { - builtin_type_misses::insert(t, &name); + if let Some(t) = builtin_type { + t.verdict_record(crate::types::Verdict::TypeAttrMissing, &name, true); + } + if let Some(c) = value_class { + c.verdict_record(crate::types::Verdict::ValueAttrMissing, &name, true); } Ok(Object::Bool(false)) } @@ -40348,7 +43496,7 @@ impl Interpreter { // CPython GET_AWAITABLE: a coroutine that is suspended // inside its own `await` (it has a yield-from // sub-iterator) cannot gain a second awaiter. - let busy = matches!(&*g.state.borrow(), GeneratorState::Suspended(frame) + let busy = matches!(&*g.state().borrow(), GeneratorState::Suspended(frame) if detect_yield_from_subiter(frame).is_some()); if busy { return Err(crate::error::runtime_error( @@ -40402,7 +43550,7 @@ impl Interpreter { let RuntimeError::PyException(mut outer) = not_awaitable(&value) else { unreachable!("not_awaitable builds a PyException"); }; - outer.traceback = inner.traceback.clone(); + outer.traced = inner.traced; outer.cause = Some(Box::new(inner.clone())); outer.context = Some(Box::new(inner)); Self::sync_exc_attrs(&outer); @@ -40504,7 +43652,7 @@ impl Interpreter { match iter { Object::Iter(it) => it.borrow_mut().next_value_checked(), Object::LazyIter(l) => self.lazy_iter_next(l, globals), - Object::Generator(g) => match self.generator_send(g, Object::None) { + Object::Generator(g) => match self.generator_next_raw(g, false) { Ok(v) => Ok(Some(v)), Err(RuntimeError::PyException(exc)) if exc.type_name() == "StopIteration" => { Ok(None) @@ -40631,15 +43779,30 @@ impl Interpreter { /// Runs at the interpreter level because the wrapped source can be /// any VM iterable (generator, user `__next__`, native iterator) — /// and, like CPython's C itertools, stepping adds no Python frame. + /// A `StopIteration` that a callback raises ends the iteration, as a C + /// iterator's `tp_iternext` leaving it set does for its consumer + /// (`for x in map(f, xs)` stops where `f` raises it). fn lazy_iter_next( &mut self, l: &Rc, globals: &Rc>, + ) -> Result, RuntimeError> { + match self.lazy_iter_step(l, globals) { + Err(e) if crate::seqiter::is_stop_iteration(&e) => Ok(None), + r => r, + } + } + + /// [`Self::lazy_iter_next`]'s step. + fn lazy_iter_step( + &mut self, + l: &Rc, + globals: &Rc>, ) -> Result, RuntimeError> { use crate::object::LazyIterKind; - // Steps that run no code first (pure state machines, and native - // sources with an item ready), under one borrow. - if let Some(r) = crate::seqiter::lazy_pure_next(l) { + // Steps that run no code first (pure state machines, native + // sources with an item ready, pure callbacks), under one borrow. + if let Some(r) = self.lazy_core_next(l) { return Ok(r); } // The builtin `map`/`filter`/`zip`/`enumerate` adapters. @@ -41536,10 +44699,10 @@ impl Interpreter { // now (e.g. `await anext(me)` from inside the body) both count // as "already running" in CPython's `ag_running_async` sense. let mid_await = matches!( - &*g.state.borrow(), + &*g.state().borrow(), GeneratorState::Suspended(frame) if !frame.agen_yielded_value ) || matches!( - &*g.state.borrow(), + &*g.state().borrow(), GeneratorState::Running | GeneratorState::Delegating(_) ); if !mid_await { @@ -41665,7 +44828,7 @@ impl Interpreter { /// "completes with value" behavior) when the frame can't be inspected /// (e.g. the generator already finished). fn agen_yielded_a_value(g: &Rc) -> bool { - match &*g.state.borrow() { + match &*g.state().borrow() { GeneratorState::Suspended(frame) => frame.agen_yielded_value, _ => true, } @@ -41817,7 +44980,7 @@ impl Interpreter { let mut new_exc = PyException::new(rt_inst); // Keep the in-flight traceback so the RuntimeError points at the // offending frame; chain the original as cause + context. - new_exc.traceback = exc.traceback.clone(); + new_exc.traced = exc.traced; new_exc.cause = Some(Box::new(exc.clone())); new_exc.context = Some(Box::new(exc)); Self::sync_exc_attrs(&new_exc); @@ -41840,11 +45003,11 @@ impl Interpreter { gen: &Rc, mut exc: PyException, ) -> Result { - let prev_state = std::mem::replace(&mut *gen.state.borrow_mut(), GeneratorState::Running); + let prev_state = std::mem::replace(&mut *gen.state().borrow_mut(), GeneratorState::Running); let mut frame = match prev_state { GeneratorState::Created(boxed) | GeneratorState::Suspended(boxed) => *boxed, GeneratorState::Finished => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; // bpo-25887: throwing into an exhausted coroutine is a // RuntimeError (matching `send`), except for the // GeneratorExit that `close()` injects. @@ -41864,7 +45027,7 @@ impl Interpreter { ))); } delegating @ GeneratorState::Delegating(_) => { - *gen.state.borrow_mut() = delegating; + *gen.state().borrow_mut() = delegating; return Err(value_error(format!( "{} already executing", gen.kind.word() @@ -41912,7 +45075,7 @@ impl Interpreter { self.resume_outer_with_exc(gen, frame, close_exc) } Err(err) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; self.recycle_frame_allocs(&mut frame); Err(err) } @@ -41958,18 +45121,18 @@ impl Interpreter { Ok(v) } Ok(FrameOutcome::Returned(v)) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; self.recycle_frame_allocs(&mut frame); Err(stop_iteration_with(v)) } Ok(FrameOutcome::StartGenerator) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; Err(RuntimeError::Internal( "RETURN_GENERATOR inside generator_throw".to_owned(), )) } Err(err) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; let escaped = self.pep479_escape(gen, err); self.recycle_frame_allocs(&mut frame); Err(escaped) @@ -41987,7 +45150,7 @@ impl Interpreter { return self.resume_outer_with_exc(gen, frame, inner_exc); } Err(err) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; self.recycle_frame_allocs(&mut frame); return Err(err); } @@ -42010,7 +45173,7 @@ impl Interpreter { frame.py_frame = Some(py.clone()); py }); - py.lasti.set(frame.pc); + py.set_lasti(frame.pc); let line = frame .code .linetable @@ -42027,7 +45190,7 @@ impl Interpreter { .and_then(|()| self.fire_exception_event(&py, &exc, true)); self.pop_frame_shell(); if let Err(err) = hook_result { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; return Err(err); } frame.suppress_call_event = true; @@ -42054,7 +45217,7 @@ impl Interpreter { // raise/handled pairing). if let Some(inst) = handled_arg { if let Err(err) = self.fire_gen_handled_event(&mut frame, inst) { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; return Err(err); } } @@ -42064,18 +45227,18 @@ impl Interpreter { Ok(v) } Ok(FrameOutcome::Returned(v)) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; self.recycle_frame_allocs(&mut frame); Err(stop_iteration_with(v)) } Ok(FrameOutcome::StartGenerator) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; Err(RuntimeError::Internal( "RETURN_GENERATOR inside generator_throw".to_owned(), )) } Err(err) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; let escaped = self.pep479_escape(gen, err); self.recycle_frame_allocs(&mut frame); Err(escaped) @@ -42090,7 +45253,7 @@ impl Interpreter { // `None` to both settrace and setprofile) must fire now — // `gen_close` on a bare genexpr is exactly this path // (test_cprofile.test_throw). - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; if crate::trace::any_observers_active() { let py = frame.py_frame.clone().unwrap_or_else(|| { let py = self.build_py_frame(&frame, None); @@ -42149,7 +45312,7 @@ impl Interpreter { /// closes this way on the spot instead of queueing its finalizer. pub(crate) fn gen_close_quiet_detached(g: &PyGenerator) -> Option> { const RESUME_DEPTH1_MASK: u32 = 4; - let Ok(mut state) = g.state.try_borrow_mut() else { + let Ok(mut state) = g.state().try_borrow_mut() else { return None; }; let (created, boxed) = match &mut *state { @@ -42250,7 +45413,7 @@ impl Interpreter { // a traceback pointing at the generator's frame (the // unraisable hook asserts `exc_traceback is not None`). let frame_obj = self.gen_py_frame(&g); - *g.state.borrow_mut() = GeneratorState::Finished; + *g.state().borrow_mut() = GeneratorState::Finished; let err = crate::error::runtime_error(format!("{} ignored GeneratorExit", g.kind.word())); if let RuntimeError::PyException(pyexc) = &err { @@ -42260,7 +45423,7 @@ impl Interpreter { let tb = Rc::new(PyTraceback::new( pf.clone(), pf.last_line.get().unwrap_or(1), - pf.lasti.get(), + pf.lasti_now(), None, )); inst.slot_set("__traceback__", Object::Traceback(tb)); @@ -42273,7 +45436,7 @@ impl Interpreter { || exc.type_name() == "StopIteration" || exc.type_name() == "StopAsyncIteration" => { - *g.state.borrow_mut() = GeneratorState::Finished; + *g.state().borrow_mut() = GeneratorState::Finished; // Python 3.13 (gh-104770): if the generator catches // `GeneratorExit` and then *returns* a value, `close()` // returns it. The return surfaces as `StopIteration(value)`; @@ -42288,7 +45451,7 @@ impl Interpreter { Ok(Object::None) } Err(err) => { - *g.state.borrow_mut() = GeneratorState::Finished; + *g.state().borrow_mut() = GeneratorState::Finished; Err(err) } } @@ -42387,7 +45550,7 @@ impl Interpreter { frame.py_frame = Some(py.clone()); py }); - py.lasti.set(frame.pc); + py.set_lasti(frame.pc); py.set_back(self.materialize_top_py_frame()); self.push_materialized_frame(&py); let hook_result = @@ -42419,7 +45582,7 @@ impl Interpreter { // (CPython's exception_unwind → monitor_handled). if let Some(inst) = handled_arg { if let Err(err) = self.fire_gen_handled_event(&mut frame, inst) { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; return Err(err); } } @@ -42429,18 +45592,18 @@ impl Interpreter { Ok(v) } Ok(FrameOutcome::Returned(v)) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; self.recycle_frame_allocs(&mut frame); Err(stop_iteration_with(v)) } Ok(FrameOutcome::StartGenerator) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; Err(RuntimeError::Internal( "RETURN_GENERATOR inside resume_outer_with_exc".to_owned(), )) } Err(err) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; let escaped = self.pep479_escape(gen, err); self.recycle_frame_allocs(&mut frame); Err(escaped) @@ -42449,7 +45612,7 @@ impl Interpreter { } Ok(None) => unreachable!(), Err(err) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; let escaped = self.pep479_escape(gen, err); self.recycle_frame_allocs(&mut frame); Err(escaped) @@ -42511,7 +45674,7 @@ impl Interpreter { }; { let dict = d.borrow(); - let cell_names: Vec<&String> = frame + let cell_names: Vec<&weavepy_compiler::Name> = frame .code .cellvars .iter() @@ -42564,6 +45727,53 @@ impl Interpreter { /// on the frame or its cached shell), it suspended outside any /// handler (no detached exception state to restore), and its code /// is the interpreter's — else `None` and the general path runs. + /// `next(gen)` from native code (`next()` outside the core loop, a + /// native iterator's step over a generator): a simple body steps to + /// its next yield in place, as a `FOR_ITER` over it does (see + /// `gen_fast`), and anything else resumes through + /// [`Self::generator_send`]. With `raw`, as [`Self::generator_resume`] + /// reports a return. (`gen.send(None)` keeps its activation: a body + /// tier 2 parks natively resumes there.) + fn generator_next_raw( + &mut self, + gen: &Rc, + raw: bool, + ) -> Result { + if gen.kind == crate::object::CoroutineKind::Generator { + if let Some(r) = self.generator_next_fast(gen, raw) { + return r; + } + } + if raw { + GEN_RAW_RETURN.with(|r| r.set(true)); + } + self.generator_send_fold(gen, Object::None, None) + } + + /// [`Self::generator_next_raw`]'s fast step, on the lean resume's + /// terms: `None` when the generator or its body declines, with nothing + /// run (or the body stopped partway, parked for the general resume to + /// go on with). + #[inline] + fn generator_next_fast( + &mut self, + gen: &Rc, + raw_return: bool, + ) -> Option> { + let snap_gen = self.lean_snapshot()?; + if self.dbg_sample + || crate::trace::eval_frame_record_active() + || crate::stdlib::greenlet_native::on_greenlet_stack() + { + return None; + } + match self.gen_fast_next(gen, snap_gen, 0, crate::gc_trace::maybe_dead_flag()) { + gen_fast::GenNext::Yielded(v) => Some(Ok(v)), + gen_fast::GenNext::Exhausted(v) => Some(Self::generator_returned(v, raw_return)), + gen_fast::GenNext::Declined | gen_fast::GenNext::Partial => None, + } + } + fn generator_send_lean( &mut self, gen: &Rc, @@ -42582,7 +45792,7 @@ impl Interpreter { // (only a `None` may be sent into it; the general path raises). // Validate and take the frame under one borrow. No Python runs // while it is held; release it before resuming the activation. - let mut state = gen.state.try_borrow_mut().ok()?; + let mut state = gen.state().try_borrow_mut().ok()?; let first_resume; { let boxed = match &*state { @@ -42646,7 +45856,7 @@ impl Interpreter { // single send would then finish the whole generator on the // slow path. Service the breaker here (as the quiet loop's // checkpoint does) and keep stepping. - while fast.is_none() + while matches!(fast, gen_fast::GenStep::Bail) && self.gil_countdown <= 1 && crate::hot_gates::loop_gen() == snap_gen && !frame.sent_consumed @@ -42658,8 +45868,10 @@ impl Interpreter { } fast = self.gen_fast_run(frame, snap_gen, fold); } - if let Some(v) = fast { + if let gen_fast::GenStep::Yielded(v) = fast { Ok(FrameOutcome::Yielded(v)) + } else if let gen_fast::GenStep::Returned(v) = fast { + Ok(FrameOutcome::Returned(v)) } else { // The draining consumer's sink, folded at this frame's yields. let prev_fold = std::mem::replace( @@ -42726,20 +45938,21 @@ impl Interpreter { Ok(v) } Ok(FrameOutcome::Returned(v)) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + Self::finish_running_gen(gen); let frame: &mut Frame = &mut boxed; self.recycle_frame_allocs(frame); Self::release_finished_gen(gen); + self.recycle_gen_box(boxed); Self::generator_returned(v, raw_return) } Ok(FrameOutcome::StartGenerator) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; Err(RuntimeError::Internal( "RETURN_GENERATOR in already-running generator".to_owned(), )) } Err(err) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; let escaped = self.pep479_escape(gen, err); let frame: &mut Frame = &mut boxed; self.recycle_frame_allocs(frame); @@ -42760,20 +45973,47 @@ impl Interpreter { if gen.kind == crate::object::CoroutineKind::AsyncGenerator { return; } - // A generator still in the collector's young set has no index + // A generator still in the collector's young set has no registry // entry to remove (the set drops it once it's dead). - if !gen.gc_registered.get() { + if !gen.gc_slot.is_registered() { return; } let id = Rc::as_ptr(gen) as usize as u64; if crate::weakref_registry::count_for(id) > 0 { return; } - gen.gc_registered.set(false); - gc_trace::untrack_registered_id(id); + gc_trace::untrack_generator(gen); + } + + /// Mark `gen`, running (its frame out of its state), finished. + #[inline] + fn finish_running_gen(gen: &Rc) { + // SAFETY: the store runs no code (the displaced state is `Running`, + // which owns nothing) and no guard is live on the cell (`peek_mut` + // checks). + match unsafe { gen.state().peek_mut() } { + Some(state) if matches!(state, GeneratorState::Running) => unsafe { + std::ptr::write(state, GeneratorState::Finished); + }, + Some(state) => *state = GeneratorState::Finished, + None => *gen.state().borrow_mut() = GeneratorState::Finished, + } + } + + /// Hand a coroutine whose tracking was deferred (see + /// [`PyGenerator::track_deferred`]) to the collector. + #[cold] + #[inline(never)] + fn track_deferred_gen(gen: &Rc) { + gen.track_deferred.set(false); + gc_trace::track_generator(&Object::Coroutine(gen.clone())); } fn park_suspended_boxed(gen: &Rc, boxed: Box) { + // Suspended, it can close a cycle the collector must see. + if gen.track_deferred.get() { + Self::track_deferred_gen(gen); + } if let Some(py) = &boxed.py_frame { if py.gen_owner.borrow().is_none() { *py.gen_owner.borrow_mut() = Some(Rc::downgrade(gen)); @@ -42782,14 +46022,14 @@ impl Interpreter { // SAFETY: the store runs no code (the displaced state is // `Running`, which owns nothing) and no guard is live on the cell // (`peek_mut` checks). - match unsafe { gen.state.peek_mut() } { + match unsafe { gen.state().peek_mut() } { // `Running` owns nothing: no drop glue for the displaced state. // SAFETY: as above. Some(state) if matches!(state, GeneratorState::Running) => unsafe { std::ptr::write(state, GeneratorState::Suspended(boxed)); }, Some(state) => *state = GeneratorState::Suspended(boxed), - None => *gen.state.borrow_mut() = GeneratorState::Suspended(boxed), + None => *gen.state().borrow_mut() = GeneratorState::Suspended(boxed), } } @@ -42836,10 +46076,15 @@ impl Interpreter { fire: bool, ) -> Result, RuntimeError> { let raw = !crate::trace::any_observers_active(); - if raw { - GEN_RAW_RETURN.with(|r| r.set(true)); - } - match self.generator_send_fold(g, Object::None, fold) { + let result = if fold.is_none() { + self.generator_next_raw(g, raw) + } else { + if raw { + GEN_RAW_RETURN.with(|r| r.set(true)); + } + self.generator_send_fold(g, Object::None, fold) + }; + match result { Ok(Object::Unbound) if raw => { drop(GEN_RETURN_VALUE.with(|v| v.borrow_mut().take())); Ok(None) @@ -42885,12 +46130,12 @@ impl Interpreter { // Take the boxed frame; it is run *in place* (RFC 0069 WS4) so // the yield round-trip neither reallocates the box nor moves // the frame through the stack. - let prev_state = std::mem::replace(&mut *gen.state.borrow_mut(), GeneratorState::Running); + let prev_state = std::mem::replace(&mut *gen.state().borrow_mut(), GeneratorState::Running); let (mut boxed, first_resume) = match prev_state { GeneratorState::Created(boxed) => (boxed, true), GeneratorState::Suspended(boxed) => (boxed, false), GeneratorState::Finished => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; // bpo-25887: re-awaiting a completed coroutine is an // error, not a silent StopIteration. if matches!(gen.kind, crate::object::CoroutineKind::Coroutine) { @@ -42907,7 +46152,7 @@ impl Interpreter { ))); } delegating @ GeneratorState::Delegating(_) => { - *gen.state.borrow_mut() = delegating; + *gen.state().borrow_mut() = delegating; return Err(value_error(format!( "{} already executing", gen.kind.word() @@ -42981,7 +46226,7 @@ impl Interpreter { // dance unwraps to `None` rather than to the empty // string we get from `from_builtin("StopIteration", // "")`. - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; let frame: &mut Frame = &mut boxed; // RFC 0059 WS4: the exhausted frame's storage is dead — // donate it back to the frame pools. @@ -42990,13 +46235,13 @@ impl Interpreter { Self::generator_returned(v, raw_return) } Ok(FrameOutcome::StartGenerator) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; Err(RuntimeError::Internal( "RETURN_GENERATOR in already-running generator".to_owned(), )) } Err(err) => { - *gen.state.borrow_mut() = GeneratorState::Finished; + *gen.state().borrow_mut() = GeneratorState::Finished; let escaped = self.pep479_escape(gen, err); let frame: &mut Frame = &mut boxed; self.recycle_frame_allocs(frame); @@ -43852,6 +47097,11 @@ impl Interpreter { b: &Object, globals: &Rc>, ) -> Result { + if let Object::Str(t) = a { + if let Some(out) = percent_render_plain_value(t, b) { + return Ok(Object::from_str(out)); + } + } if a.is_str() { // Surrogate-aware printf: a `WStr` template (and any `WStr` // argument resolved via `%s`) bridges its lone surrogates into @@ -44025,6 +47275,23 @@ impl Interpreter { } } + /// `type(x).` for an instance `x` when it is a plain + /// Python function, from the class's cache (see + /// [`Self::instance_dunder_function`]): called with `x` first, it is + /// what [`Self::cmp_method`] binds. + fn cmp_function(x: &Object, op: CompareKind) -> Option> { + /// Class cache keys per comparison dunder. + static CMP_KEYS: [u8; 8] = [0; 8]; + let Object::Instance(inst) = x else { + return None; + }; + Self::instance_dunder_function( + inst, + std::ptr::addr_of!(CMP_KEYS[op as usize]) as usize, + cmp_dunder(op).0, + ) + } + /// Bool-valued rich comparison — the truthiness of [`Self::rich_compare_obj`]. /// Used everywhere a comparison feeds control flow or a native algorithm /// (`min`/`max`, `in`, sort merges, the `==` sentinel probes). @@ -44162,14 +47429,7 @@ impl Interpreter { if std::ptr::eq(ia.cls_raw(), ib.cls_raw()) || !ib.cls_raw().is_subclass_of(ia.cls_raw()) { - /// Class cache keys per comparison (see - /// `instance_dunder_function`). - static CMP_KEYS: [u8; 8] = [0; 8]; - if let Some(f) = Self::instance_dunder_function( - ia, - std::ptr::addr_of!(CMP_KEYS[op as usize]) as usize, - cmp_dunder(op).0, - ) { + if let Some(f) = Self::cmp_function(a, op) { let r = self.call_dunder_function(f, &[a.clone(), b.clone()])?; if !r.is_same(&crate::vm_singletons::not_implemented()) { return Ok(r); @@ -44288,9 +47548,12 @@ impl Interpreter { // interface's richer `__eq__` first (test_ipaddress), and // `addr < intf` must run the interface's total_ordering // `__gt__` first. + // (A plain function on an instance's class, from the class's + // cache, is called directly below, as `cmp_method` would bind it.) + let b_function = Self::cmp_function(b, cmp_swapped(op)); let reflected_first = !Rc::ptr_eq(&cls_b, &cls_a) && cls_b.is_subclass_of(&cls_a) - && (cls_b.lookup(swapped).is_some() || b_foreign); + && (b_function.is_some() || b_foreign || cls_b.lookup(swapped).is_some()); let mut tried_reflected = false; // Track whether each operand's *own* `__ne__` slot actually ran. // `object.__ne__` (installed on every class) already derives from the @@ -44310,7 +47573,13 @@ impl Interpreter { Err(e) => return Err(e), } } - if let Some(method) = self.cmp_method(b, swapped, globals) { + if let Some(f) = b_function.clone() { + b_slot_ran = true; + let r = self.call_dunder_function(f, &[b.clone(), a.clone()])?; + if !r.is_same(¬_impl) { + return Ok(r); + } + } else if let Some(method) = self.cmp_method(b, swapped, globals) { b_slot_ran = true; let r = self.call(&method, std::slice::from_ref(a), &[], globals)?; if !r.is_same(¬_impl) { @@ -44329,6 +47598,12 @@ impl Interpreter { } if forward_ran { a_slot_ran = true; + } else if let Some(f) = Self::cmp_function(a, op) { + a_slot_ran = true; + let r = self.call_dunder_function(f, &[a.clone(), b.clone()])?; + if !r.is_same(¬_impl) { + return Ok(r); + } } else if let Some(method) = self.cmp_method(a, dunder, globals) { a_slot_ran = true; let r = self.call(&method, std::slice::from_ref(b), &[], globals)?; @@ -44346,7 +47621,13 @@ impl Interpreter { Err(e) => return Err(e), } } - if let Some(method) = self.cmp_method(b, swapped, globals) { + if let Some(f) = b_function { + b_slot_ran = true; + let r = self.call_dunder_function(f, &[b.clone(), a.clone()])?; + if !r.is_same(¬_impl) { + return Ok(r); + } + } else if let Some(method) = self.cmp_method(b, swapped, globals) { b_slot_ran = true; let r = self.call(&method, std::slice::from_ref(a), &[], globals)?; if !r.is_same(¬_impl) { @@ -45184,7 +48465,7 @@ impl Interpreter { if let Some((k, v)) = g.get_index(key_idx as usize) { // Verify the key at the cached slot still matches the // expected name. `del` of an earlier global shift-removes - // an IndexMap entry, renumbering every later slot without + // a table entry, renumbering every later slot without // changing the dict's Rc identity — so the cached index // would otherwise alias a *different* global's value. if let Object::Str(s) = &k.0 { @@ -45222,7 +48503,7 @@ impl Interpreter { .code .names .get(name_idx as usize) - .map(String::as_str) + .map(|n| n.as_str()) .ok_or_else(|| RuntimeError::Internal("bad name index".to_owned()))?; if frame .globals @@ -45437,23 +48718,74 @@ impl Interpreter { // SAFETY: see `CoreSwitch`: the running activation is synced and // unborrowed here. let frame = unsafe { &mut *sw.cur }; + let frame_field = frame.code.instructions[pc].op == OpCode::LoadAttr + && matches!(frame.stack.last(), Some(Object::Frame(_) | Object::Code(_))); + // A site cooling down after a failed load (an odd count; see + // `specialized_load_attr`'s `Cooldown` arm) asks whether the + // attribute is certainly missing, ahead of the getter lanes. + let failing = failing_attr_site(&frame.code, pc); // A property's or a Python data descriptor's getter runs as an // inline activation, as the core loop's own arm runs it. if frame.code.instructions[pc].op == OpCode::LoadAttr + && !frame_field + && !failing && (self.core_property(sw) || self.core_getitem(sw, true)) { return Ok(()); } // SAFETY: as above (both declined untouched). let frame = unsafe { &mut *sw.cur }; - let arg = frame.code.instructions[pc].arg; + let ins = frame.code.instructions[pc]; + // A frame's or code object's plain field. + if frame_field { + let running = (Rc::as_ptr(&frame.locals).cast::<()>(), pc as u32); + let v = match (frame.stack.last(), frame.code.names.get(ins.arg as usize)) { + (Some(recv), Some(name)) => Self::frame_plain_attr(recv, name, Some(running)), + _ => None, + }; + if let Some(v) = v { + frame.pc = pc as u32 + 1; + if let Some(top) = frame.stack.last_mut() { + let recv = std::mem::replace(top, v); + self.release(recv); + } + return Ok(()); + } + } frame.pc = pc as u32 + 1; let pending = self.core_pending_enter(sw, frame, pc); - let r = self.load_attr_step(frame, pc as u32, arg); + let r = match ins.op { + OpCode::LoadAttr if failing => match self.load_attr_certain_miss(frame, ins.arg) { + Some(err) => Err(err), + None => self.load_attr_step(frame, pc as u32, ins.arg), + }, + _ => self.load_attr_step(frame, pc as u32, ins.arg), + }; self.core_pending_exit(sw, pending); r } + /// A `LOAD_ATTR` (name `name_idx`) of a plain instance that has no + /// such attribute anywhere ([`attr_certainly_missing`]): the receiver + /// leaves the stack, released as the full load releases it, and the + /// `AttributeError` the default lookup ends with comes back without + /// its resolution passes. `None` touches nothing. + #[cfg(feature = "jit")] + #[inline(never)] + fn load_attr_certain_miss(&mut self, frame: &mut Frame, name_idx: u32) -> Option { + let recv @ Object::Instance(_) = frame.stack.last()? else { + return None; + }; + let name = frame.code.names.get(name_idx as usize)?; + if !attr_certainly_missing(recv, name) { + return None; + } + let recv = frame.stack.pop()?; + let err = crate::error::attribute_error_named(&recv, name); + self.release(recv); + Some(err) + } + fn specialized_load_attr( &mut self, frame: &mut Frame, @@ -45525,7 +48857,7 @@ impl Interpreter { // genuine `__slots__` member descriptor for this // name) and the version guard covers class-dict / // MRO changes since. - let name = frame.code.names.get(name_idx as usize).map(String::as_str); + let name = frame.code.names.get(name_idx as usize).map(|n| n.as_str()); if let Some(name) = name { let hit = { let slots = inst.slots.borrow(); @@ -45542,9 +48874,19 @@ impl Interpreter { specialize::record_hit(op_idx); return Ok(v); } + // Unset slot: the member descriptor raises its + // `AttributeError`, as the default lookup's data + // descriptor step would (the guard rules out a + // `__getattr__` hook), and the site stays as it is + // (CPython's `LOAD_ATTR_SLOT` deopts for this + // execution only). + let cls = inst.cls(); + if let Some(sd @ Object::SlotDescriptor(_)) = cls.lookup(name) { + let owner = Object::Type(cls); + let result = self.descriptor_get(&sd, &receiver, &owner); + return self.load_attr_finish(&receiver, name, result); + } } - // Unset slot: the slow path raises the faithful - // AttributeError. } } self.deopt_load_attr_taken(frame, cache_pc, name_idx, receiver) @@ -45663,9 +49005,9 @@ impl Interpreter { self.deopt_load_attr_taken(frame, cache_pc, name_idx, receiver) } IC::Empty => { - let name = self.name_at(&frame.code, name_idx)?; + let name = Self::name_ref(&frame.code, name_idx)?; let obj = receiver; - let result = self.load_attr(&obj, &name); + let result = self.load_attr(&obj, name); // Specialize *after* the generic lookup. The decision's // dict-index probe hashes `name` into the instance dict and // can run a hostile key's `__eq__` (test_descr @@ -45673,10 +49015,16 @@ impl Interpreter { // descriptor from one); that side effect must not run ahead // of the lookup it's meant to accelerate. specialize::record_specialize_attempt(op_idx); + // A site cools down two steps at a time from an odd count + // when its load failed, an even one otherwise (see the + // `Cooldown` arm). let decision = if result.is_ok() { - specialize::attempt_specialize_load_attr(&obj, &name) + match specialize::attempt_specialize_load_attr(&obj, name) { + IC::Cooldown(n) => IC::Cooldown(n.saturating_mul(2) & !1), + decision => decision, + } } else { - IC::Cooldown(COOLDOWN) + IC::Cooldown(2 * COOLDOWN + 1) }; frame.code.caches.set(cache_pc, decision); if matches!(decision, IC::Cooldown(_)) { @@ -45687,18 +49035,29 @@ impl Interpreter { result } IC::Cooldown(n) => { - let next = if n > 0 { - IC::Cooldown(n - 1) + let next = if n >= 2 { + IC::Cooldown(n - 2) } else { IC::Empty }; frame.code.caches.set(cache_pc, next); - let name = self.name_at(&frame.code, name_idx)?; - self.load_attr(&receiver, &name) + // A site cooling down after a failed load (an odd count; `try: + // o.x except AttributeError:`): an attribute certainly missing + // raises the `AttributeError` the default lookup ends with, + // without its resolution passes. + if let (1, Some(name)) = (n & 1, frame.code.names.get(name_idx as usize)) { + if attr_certainly_missing(&receiver, name) { + let err = crate::error::attribute_error_named(&receiver, name); + self.release(receiver); + return Err(err); + } + } + let name = Self::name_ref(&frame.code, name_idx)?; + self.load_attr(&receiver, name) } _ => { - let name = self.name_at(&frame.code, name_idx)?; - self.load_attr(&receiver, &name) + let name = Self::name_ref(&frame.code, name_idx)?; + self.load_attr(&receiver, name) } } } @@ -45715,12 +49074,13 @@ impl Interpreter { receiver: Object, ) -> Result { specialize::record_miss(OpCode::LoadAttr as u8); - frame - .code - .caches - .set(cache_pc, weavepy_compiler::InlineCache::Cooldown(COOLDOWN)); - let name = self.name_at(&frame.code, name_idx)?; - self.load_attr(&receiver, &name) + // (An even count: see `specialized_load_attr`'s `Cooldown` arm.) + frame.code.caches.set( + cache_pc, + weavepy_compiler::InlineCache::Cooldown(2 * COOLDOWN), + ); + let name = Self::name_ref(&frame.code, name_idx)?; + self.load_attr(&receiver, name) } /// Specialized `STORE_ATTR`. Stack discipline matches the @@ -45978,9 +49338,10 @@ impl Interpreter { self.deopt_store_attr_taken(frame, cache_pc, name_idx, receiver) } IC::Empty => { - let name = self.name_at(&frame.code, name_idx)?; + let code = frame.code.clone(); + let name = Self::name_ref(&code, name_idx)?; specialize::record_specialize_attempt(op_idx); - let decision = specialize::attempt_specialize_store_attr(&receiver, &name); + let decision = specialize::attempt_specialize_store_attr(&receiver, name); frame.code.caches.set(cache_pc, decision); if matches!(decision, IC::Cooldown(_)) { specialize::record_specialize_skip(op_idx); @@ -45988,7 +49349,7 @@ impl Interpreter { specialize::record_specialize_success(op_idx); } let val = frame.pop()?; - self.store_attr(&receiver, &name, val) + self.store_attr(&receiver, name, val) } IC::Cooldown(n) => { let next = if n > 0 { @@ -45998,13 +49359,13 @@ impl Interpreter { }; frame.code.caches.set(cache_pc, next); let val = frame.pop()?; - let name = self.name_at(&frame.code, name_idx)?; - self.store_attr(&receiver, &name, val) + let name = Self::name_ref(&frame.code, name_idx)?; + self.store_attr(&receiver, name, val) } _ => { let val = frame.pop()?; - let name = self.name_at(&frame.code, name_idx)?; - self.store_attr(&receiver, &name, val) + let name = Self::name_ref(&frame.code, name_idx)?; + self.store_attr(&receiver, name, val) } } } @@ -46025,8 +49386,8 @@ impl Interpreter { .caches .set(cache_pc, weavepy_compiler::InlineCache::Cooldown(COOLDOWN)); let val = frame.pop()?; - let name = self.name_at(&frame.code, name_idx)?; - self.store_attr(&receiver, &name, val) + let name = Self::name_ref(&frame.code, name_idx)?; + self.store_attr(&receiver, name, val) } /// Specialized `FOR_ITER`. Returns `Ok(true)` when the fast @@ -46687,6 +50048,7 @@ impl Interpreter { ))); }; *ty.qualname.borrow_mut() = Some(s.to_string()); + ty.forget_display_names(); return Ok(()); } // The `type.__dict__` / `type.__mro__` getsets have no setter in @@ -47127,6 +50489,7 @@ impl Interpreter { // was made from. f.slots(); *f.code.borrow_mut() = c; + f.names_kept.set(0); crate::rare_events::bump(crate::rare_events::FUNC_MODIFICATION); if crate::capi_watchers::funcs_active() { crate::capi_watchers::func_event("MODIFY_CODE", obj, &new_code); @@ -48304,10 +51667,15 @@ impl Interpreter { _ => {} } } - let removed = inst - .dict_cell() - .borrow_mut() - .shift_remove(&DictKey(Object::from_str(name))); + // The split layout deletes in place (see `PyInstance::split_remove`); + // a real dictionary is watchable. + let removed = match inst.split_remove(name) { + Some(removed) => removed, + None => inst + .dict_cell() + .borrow_mut() + .shift_remove(&DictKey(Object::from_str(name))), + }; // Watched instance `__dict__` observes attribute deletion as // PyDict_EVENT_DELETED (test_watchers test_object_dict). if removed.is_some() && crate::capi_watchers::dicts_active() { @@ -49399,10 +52767,13 @@ impl Interpreter { })?; let rest: &[Object] = if args.is_empty() { &[] } else { &args[1..] }; return match b.name { - ".u.gen_send" | ".u.cor_send" => self.gen_method_send( - &receiver, - rest.first().cloned().unwrap_or(Object::None), - ), + ".u.gen_send" | ".u.cor_send" => { + gen_send_arity(&receiver, rest.len())?; + self.gen_method_send( + &receiver, + rest.first().cloned().unwrap_or(Object::None), + ) + } ".u.gen_throw" | ".u.cor_throw" => { self.gen_method_throw(&receiver, rest) } @@ -50628,6 +53999,7 @@ impl Interpreter { return Err(type_error("__subclasses__() requires a type receiver")); } ".gen_send" | ".cor_send" => { + gen_send_arity(&bm.receiver, args.len())?; let value = args.first().cloned().unwrap_or(Object::None); return self.gen_method_send(&bm.receiver, value); } @@ -51047,6 +54419,11 @@ impl Interpreter { kwargs: &[(String, Object)], ) -> Result { if let ([arg], []) = (args, kwargs) { + // `type(x)`: the class itself (`b_type`), without the + // constructor dispatch `instantiate` runs first. + if Rc::ptr_eq(ty, &builtin_types().type_) { + return Ok(Object::Type(builtins::class_of(arg))); + } if let Some(r) = self.container_ctor1(ty, arg) { return r; } @@ -51296,7 +54673,7 @@ impl Interpreter { }; let name = match args.get(2) { Some(Object::Str(s)) => s.to_string(), - Some(Object::None) | None => code.name.clone(), + Some(Object::None) | None => code.name.to_string(), Some(other) => { return Err(type_error(format!( "function() argument 'name' must be str or None, not {}", @@ -51360,7 +54737,7 @@ impl Interpreter { .unwrap_or_else(|| self.builtins.clone()), }; Ok(Object::Function(Rc::new(crate::object::PyFunction { - name, + name: name.into(), code: RefCell::new(code), globals, builtins, @@ -51372,6 +54749,8 @@ impl Interpreter { slot_seed: RefCell::new(None), closure_cells: std::sync::OnceLock::new(), defaults_override: crate::object::OverrideFlag::new(false), + names_kept: crate::sync::Cell::new(0), + gc_slot: crate::gc_trace::GcSlot::new(), }))) } @@ -53572,7 +56951,19 @@ impl Interpreter { /// class's `__init__` never calls `super().__init__`. fn seed_exception_args(inst: &Object, args: impl Iterator) { if let Object::Instance(i) = inst { - i.slot_set("args", Object::new_tuple(args.collect())); + let args = Object::new_tuple(args.collect()); + if i.slots.borrow().is_empty_default() { + // Laid out as a built-in construction's (see + // `SlotStorage::exception`), so a raise fills its slots in + // place. As there, only a non-atomic argument can close a + // cycle through the instance. + if matches!(&args, Object::Tuple(t) if t.iter().any(|x| !gc_trace::is_atomic(x))) { + i.ensure_gc_tracked(); + } + *i.slots.borrow_mut() = crate::types::SlotStorage::exception(args, []); + } else { + i.slot_set("args", args); + } } } @@ -53861,6 +57252,15 @@ impl Interpreter { _ => false, }; + let bare_alloc = is_object_new + && init_from_object + && user_new.is_none() + && abstract_error.is_none() + && !seeds_exception_args + && matches!(native, NativeKind::Plain) + && !cls.is_subclass_of(&bt.module_) + && !cls.is_subclass_of(&bt.generic_alias_); + crate::types::InstancePlan { abstract_error, user_new, @@ -53873,6 +57273,9 @@ impl Interpreter { only_object_init, lean_init, tuple_new, + bare_alloc, + store_init: std::sync::atomic::AtomicU8::new(0), + slot_members: std::sync::OnceLock::new(), } } @@ -54740,9 +58143,7 @@ impl Interpreter { let inst = PyInstance::new(cls); let args_tuple = Object::new_tuple(args.to_vec()); inst.note_slot_store(&args_tuple); - let mut entries = Vec::with_capacity(4); - entries.push((crate::types::slot_key("args"), args_tuple)); - *inst.slots.borrow_mut() = crate::types::SlotStorage::from_entries(entries); + *inst.slots.borrow_mut() = crate::types::SlotStorage::exception(args_tuple, []); let obj = Object::Instance(Rc::new(inst)); // See the GC note at the end. if args.iter().any(|x| !crate::gc_trace::is_atomic(x)) { @@ -54770,13 +58171,27 @@ impl Interpreter { }; // (No `message` mirror: CPython has none, and `str()` and the Rust // display derive the text from `args`.) - inst.slot_set("args", args_tuple); // PEP 380: `StopIteration.value` is the first constructor arg // (or None). Generator `return` goes through // `stop_iteration_with`, but user code constructs // `StopIteration(x)` directly and reads `.value` too. - if is_stop_iteration { - inst.slot_set("value", args.first().cloned().unwrap_or(Object::None)); + let value = is_stop_iteration.then(|| args.first().cloned().unwrap_or(Object::None)); + if inst.slots.borrow().is_empty_default() { + // Laid out as the common case's (see `SlotStorage::exception`). + inst.note_slot_store(&args_tuple); + let slots = match value { + Some(value) => { + inst.note_slot_store(&value); + crate::types::SlotStorage::exception(args_tuple, [("value", value)]) + } + None => crate::types::SlotStorage::exception(args_tuple, []), + }; + *inst.slots.borrow_mut() = slots; + } else { + inst.slot_set("args", args_tuple); + if let Some(value) = value { + inst.slot_set("value", value); + } } // `SystemExit.code`: None for no args, the lone argument for // one, the whole tuple otherwise (CPython `SystemExit_init`). @@ -54953,11 +58368,24 @@ impl Interpreter { /// call to the full machinery, nothing having happened. #[inline] fn call_pure_leaf(&self, f: &PyFunction, args: &[Object]) -> Option { + self.call_pure_leaf_with(f, None, args) + } + + /// [`Self::call_pure_leaf`] with `recv`, when given, as the first + /// argument (a bound method's receiver). + #[inline] + pub(crate) fn call_pure_leaf_with( + &self, + f: &PyFunction, + recv: Option<&Object>, + args: &[Object], + ) -> Option { const MAX_ARGS: usize = 6; // SAFETY: a function's code is only replaced under the GIL, and // nothing here runs code that could replace it. let code = unsafe { &*f.code.as_ptr() }; - if args.len() > MAX_ARGS + let n = args.len() + usize::from(recv.is_some()); + if n > MAX_ARGS || !code_is_pure_leaf(code) || !pure_leaf_warm(code) || crate::trace::any_observers_active() @@ -54967,10 +58395,10 @@ impl Interpreter { return None; } let mut ptrs = [std::ptr::null::(); MAX_ARGS]; - for (p, a) in ptrs.iter_mut().zip(args) { + for (p, a) in ptrs.iter_mut().zip(recv.into_iter().chain(args)) { *p = a; } - self.pure_leaf_eval::(code, f, &ptrs[..args.len()]) + self.pure_leaf_eval::(code, f, &ptrs[..n]) } /// The full argument binder for [`Self::call_python_owned`]: CPython's @@ -55296,7 +58724,7 @@ impl Interpreter { f.slot("__qualname__") .as_ref() .map(Object::to_str) - .unwrap_or_else(|| code.qualname.clone()) + .unwrap_or_else(|| code.qualname.to_string()) }; if !missing_positional.is_empty() { return Err(type_error(format_missing_arguments( @@ -55318,7 +58746,7 @@ impl Interpreter { .slot("__qualname__") .as_ref() .map(Object::to_str) - .unwrap_or_else(|| code.qualname.clone()); + .unwrap_or_else(|| code.qualname.to_string()); return Err(type_error(format_missing_arguments( &error_name, "keyword-only", @@ -55420,6 +58848,72 @@ impl Interpreter { }, )? }; + self.call_python_bound(f, code, positional) + } + + /// A keyword call of `f`: the positional `args`, then `kwvals` named by + /// `names` (the call site's `str` objects, one per value). Bound by the + /// `CALL_KW` specialization's permutation ([`specialize::kw_perm`], + /// computed for this call: no `String` per keyword) through + /// [`Self::kw_names_fill_locals`] when the shape has one; anything else, + /// its errors included, through the full binder. + fn call_python_kw_names( + &mut self, + f: &Rc, + args: Vec, + names: &[Object], + kwvals: Vec, + ) -> Result { + let code = f.code(); + let strs = || { + names.iter().map(|n| match n { + Object::Str(s) => &**s, + _ => "", + }) + }; + let plan = if self.pending_raw_kwargs.borrow().is_none() + && names.iter().all(|n| matches!(n, Object::Str(_))) + { + specialize::kw_perm(f, &code, args.len(), strs()) + } else { + None + }; + if let Some((perm, covered)) = plan { + let (eff_argc, kwc) = (args.len(), kwvals.len()); + let mut stack: Vec = self.pooled_scratch(); + stack.extend(args); + stack.extend(kwvals); + let mut positional: Vec = self.pooled_scratch(); + Self::kw_names_fill_locals( + &mut positional, + &mut stack, + names, + f, + &code, + perm, + covered, + kwc, + eff_argc, + ); + self.recycle_scratch(stack); + return self.call_python_bound(f, code, positional); + } + let kwargs = names + .iter() + .zip(kwvals) + .map(|(n, v)| (n.to_str(), v)) + .collect(); + self.call_python_owned(f, args, kwargs) + } + + /// Run `f` (whose code is `code`) on its bound fast locals + /// `positional` (see [`Self::call_python_owned`]). + fn call_python_bound( + &mut self, + f: &Rc, + code: Rc, + positional: Vec, + ) -> Result { // Keep native eligibility outside the argument binder so its layout // values need not stay live across keyword and default processing. #[cfg(feature = "jit")] @@ -55497,7 +58991,7 @@ impl Interpreter { }; match bootstrap { FrameOutcome::StartGenerator => { - let obj = Self::wrap_started_generator(f, &code, frame); + let obj = Self::wrap_started_generator(f, &code, self.box_gen_frame(frame)); if let Some(origin) = cr_origin { if let Object::Coroutine(gen) = &obj { gen.set_origin(origin); @@ -55526,14 +59020,24 @@ impl Interpreter { /// inherits it so a *running* generator's `gi_frame` can be found /// without eager `PyFrame` construction. fn set_frame_gen_owner(gen: &Rc) { - if let GeneratorState::Created(boxed) = &mut *gen.state.borrow_mut() { + if let GeneratorState::Created(boxed) = &mut *gen.state().borrow_mut() { boxed.gen_owner = Some(Rc::downgrade(gen)); } } /// Wrap `frame`, `f`'s generator-family body just past /// `RETURN_GENERATOR`, in its generator object (tracked). - fn wrap_started_generator(f: &PyFunction, code: &CodeObject, frame: Frame) -> Object { + fn wrap_started_generator(f: &PyFunction, code: &CodeObject, frame: Box) -> Object { + let obj = Self::make_started_generator(f, code, frame); + // RFC 0024: generator frames can participate in reference cycles + // (a local that holds the generator itself), so track them like + // instances. + gc_trace::track_generator(&obj); + obj + } + + /// [`Self::wrap_started_generator`] without tracking the generator. + fn make_started_generator(f: &PyFunction, code: &CodeObject, frame: Box) -> Object { let kind = if code.is_coroutine { crate::object::CoroutineKind::Coroutine } else if code.is_async_generator { @@ -55544,34 +59048,46 @@ impl Interpreter { // CPython snapshots the *function's* current `__name__` and // `__qualname__` (which user code may have reassigned) into // `gi_name`/`gi_qualname` at call time, sharing the objects. + // A generator-family body's activations never start at pc 0, where + // the core loop counts a call's heat (see `frame_jit::Slot::warm`): + // the creation of one that awaits or delegates counts instead (its + // `SEND`s run natively; a plain generator's body still warms by + // its loops and fast steps, which pays off more reliably). + #[cfg(feature = "jit")] + if let Some(ext) = code_vm_ext(code) { + let start = ext.gen_start.load(std::sync::atomic::Ordering::Relaxed); + if code.is_coroutine || (start != u32::MAX && start & GEN_DELEGATES != 0) { + ext.frame_jit + .warm(code, ext, code.varnames.len(), frame_jit::Heat::Call); + } + } let gen_code = Object::Code(frame.code.clone()); - let gen = if f.names_seeded() { - // The code's names, which the generator reads by default. - PyGenerator::new(kind, gen_code, Box::new(frame)) - } else { - let (name, qualname) = f.name_objects(); - PyGenerator::with_names( - name.unwrap_or_else(|| Object::from_str(f.name.clone())), - qualname.unwrap_or_else(|| Object::from_str(code.qualname.clone())), - kind, - gen_code, - Box::new(frame), - ) - }; - let gen = Rc::new(gen); - Self::set_frame_gen_owner(&gen); - let obj = if code.is_coroutine { + let mut frame = frame; + // The frame's weak backlink (see `set_frame_gen_owner`), stamped as + // the generator is made. + let gen = Rc::new_cyclic(|owner| { + frame.gen_owner = Some(owner.clone()); + if f.code_names_kept(|| code_gen_names(code)) { + // The code's names, which the generator reads by default. + PyGenerator::new(kind, gen_code, frame) + } else { + let (name, qualname) = f.name_objects(); + PyGenerator::with_names( + name.unwrap_or_else(|| Object::from_str(f.name.clone())), + qualname.unwrap_or_else(|| Object::from_str(code.qualname.clone())), + kind, + gen_code, + frame, + ) + } + }); + if code.is_coroutine { Object::Coroutine(gen) } else if code.is_async_generator { Object::AsyncGenerator(gen) } else { Object::Generator(gen) - }; - // RFC 0024: generator frames can participate in reference cycles - // (a local that holds the generator itself), so track them like - // instances. - gc_trace::track(&obj); - obj + } } /// `iter(obj)` (`name` `__iter__`) or `obj.__await__()` for an @@ -55594,7 +59110,33 @@ impl Interpreter { if !code.is_generator { return None; } - self.start_generator_fast(&f, &code, vec![v.clone()]) + let start = self.generator_start(&f, &code, 1)?; + // A body without cells of its own: `self` goes straight into the + // locals, as `core_gen_call` passes a call's arguments. + if let Some(cells) = f.lean_cells_ref(&code) { + let nlocals = code.varnames.len(); + let locals = self.pooled_locals_empty(nlocals); + { + // SAFETY: sole owner (see `pooled_locals_empty`). + let l = unsafe { &mut *locals.as_ptr() }; + l.push(v.clone()); + let missing = (code.arg_count as usize).saturating_sub(1); + if missing > 0 { + l.extend(f.defaults[f.defaults.len() - missing..].iter().cloned()); + } + l.resize(nlocals, Object::Unbound); + } + let mut frame = Self::gen_frame_lean(&f, code.clone(), locals, cells.clone(), start); + frame.stack = self.pooled_stack(); + return Some(Self::wrap_started_generator( + &f, + &code, + self.box_gen_frame(frame), + )); + } + let mut positional = self.pooled_scratch(); + positional.push(v.clone()); + Some(self.start_generator_at(&f, &code, positional, start)) } /// The generator-family object a call of `f` (its code `code`) with @@ -55619,12 +59161,14 @@ impl Interpreter { /// call of `f` (its code `code`) with `given` positional arguments: /// the `RETURN_GENERATOR` it starts past, if so. fn generator_start(&self, f: &PyFunction, code: &CodeObject, given: usize) -> Option { + let ext = code_vm_ext(code)?; + let start = match ext.gen_start.load(std::sync::atomic::Ordering::Relaxed) { + 0 => Self::generator_start_scan(code, ext)?, + u32::MAX => return None, + at => (at & !GEN_DELEGATES) as usize - 1, + }; let nargs = code.arg_count as usize; - if !(code.is_generator || code.is_coroutine || code.is_async_generator) - || code.kwonly_count != 0 - || code.has_varargs - || code.has_varkeywords - || given > nargs + if given > nargs || (code.is_coroutine && crate::stdlib::sys::coroutine_origin_tracking_depth() > 0) || crate::trace::eval_frame_record_active() || crate::trace::any_observers_active() @@ -55636,11 +59180,33 @@ impl Interpreter { if missing > 0 && (missing > f.defaults.len() || f.defaults_maybe_overridden()) { return None; } + Some(start) + } + + /// [`Self::generator_start`]'s verdict on `code`'s shape and prologue, + /// remembered in its extension table: a generator-family body with + /// positional parameters only, and the `RETURN_GENERATOR` it starts + /// past. + #[cold] + #[inline(never)] + fn generator_start_scan(code: &CodeObject, ext: &CodeConstObjects) -> Option { + let shaped = (code.is_generator || code.is_coroutine || code.is_async_generator) + && code.kwonly_count == 0 + && !code.has_varargs + && !code.has_varkeywords; let start = code .instructions .iter() - .position(|i| !matches!(i.op, OpCode::MakeCell | OpCode::CopyFreeVars))?; - (code.instructions[start].op == OpCode::ReturnGenerator).then_some(start) + .position(|i| !matches!(i.op, OpCode::MakeCell | OpCode::CopyFreeVars)) + .filter(|&start| shaped && code.instructions[start].op == OpCode::ReturnGenerator); + let delegates = code.instructions.iter().any(|i| i.op == OpCode::Send); + ext.gen_start.store( + start.map_or(u32::MAX, |at| { + (at as u32 + 1) | if delegates { GEN_DELEGATES } else { 0 } + }), + std::sync::atomic::Ordering::Relaxed, + ); + start } /// [`Self::start_generator_fast`] once [`Self::generator_start`] has @@ -55656,15 +59222,78 @@ impl Interpreter { if missing > 0 { positional.extend(f.defaults[f.defaults.len() - missing..].iter().cloned()); } - let mut frame = self.make_frame( - code.clone(), - positional, - f.closure.clone(), - f.globals.clone(), - Some(f.builtins.clone()), - ); - frame.pc = start as u32 + 1; - Self::wrap_started_generator(f, code, frame) + let frame = match f.lean_cells_ref(code) { + // No cells of its own: the function's (see `core_gen_call`). + Some(cells) => { + let locals = self.pooled_locals_from_args(&mut positional, code.varnames.len()); + self.recycle_scratch(positional); + let mut frame = Self::gen_frame_lean(f, code.clone(), locals, cells.clone(), start); + frame.stack = self.pooled_stack(); + frame + } + None => { + let mut frame = self.make_frame( + code.clone(), + positional, + f.closure.clone(), + f.globals.clone(), + Some(f.builtins.clone()), + ); + frame.pc = start as u32 + 1; + frame + } + }; + Self::wrap_started_generator(f, code, self.box_gen_frame(frame)) + } + + /// The frame of a generator-family call of `f` (its code `code`, which + /// defines no cells of its own) with its `locals` filled and `cells` + /// the function's, just past the `RETURN_GENERATOR` at `start`. + #[inline] + fn gen_frame_lean( + f: &PyFunction, + code: Rc, + locals: Rc>>, + cells: Rc>>>, + start: usize, + ) -> Frame { + Frame { + code, + locals, + cells, + stack: Vec::new(), + globals: f.globals.clone(), + builtins: f.builtins.clone(), + rare: None, + exc: None, + agen_yielded_value: true, + pc: start as u32 + 1, + py_frame: None, + gen_owner: None, + suppress_call_event: false, + gen_first_resume: false, + sent_consumed: false, + shell_cache: None, + #[cfg(feature = "jit")] + parked_native: None, + } + } + + /// Whether a `CALL` of one argument with `callee` and `slot` below it + /// is `gen.send(v)` or `coro.send(v)`: the bound method with an empty + /// self slot, or the method form `gen.send` loads (see + /// `core_gen_method`). + #[inline(always)] + pub(crate) fn gen_send_call(callee: &Object, slot: &Object) -> bool { + match (callee, slot) { + (Object::BoundMethod(bm), Object::Unbound) => { + matches!(&bm.function, Object::Builtin(b) if matches!(b.name, ".gen_send" | ".cor_send")) + } + (Object::Builtin(b), Object::Generator(_) | Object::Coroutine(_)) => { + matches!(b.name, ".u.gen_send" | ".u.cor_send") + } + _ => false, + } } /// The core loop's `CALL` at `pc` of a generator function (a plain @@ -55694,44 +59323,185 @@ impl Interpreter { } _ => return false, }; - let code = f.code(); - let Some(start) = self.generator_start(f, &code, argc + usize::from(receiver.is_some())) + // SAFETY: GIL-serialized raw read of the function's code cell (the + // callee on the stack holds the function). + let code_ref: &Rc = unsafe { &*f.code.as_ptr() }; + let Some(start) = self.generator_start(f, code_ref, argc + usize::from(receiver.is_some())) else { return false; }; + let code = code_ref.clone(); + // A body without cells of its own shares the function's (see + // `PyFunction::lean_cells`), and its frame is built right here. + let cells = f.lean_cells_ref(&code).cloned(); // Committed: the arguments move into the generator's frame, and // the callee and its self slot leave the stack (one that dies // queues its finalizer, which runs before the next instruction). - let mut positional = self.pooled_scratch(); - let mut ops = frame.stack.drain(callee_at..); - let callee = ops.next().expect("checked above"); - let slot = ops.next().expect("checked above"); - let callee_receiver = match &callee { - Object::BoundMethod(bm) => Some(bm.receiver.clone()), - _ => None, + // The operands are moved out whole: the stack forgets them first + // (nothing touches it until they're all moved). + let nargs = argc; + let base = frame.stack.as_mut_ptr(); + // SAFETY: `callee_at + 2 + nargs` is the stack's length. + let (callee, slot, args) = unsafe { + frame.stack.set_len(callee_at); + ( + base.add(callee_at).read(), + base.add(callee_at + 1).read(), + base.add(callee_at + 2), + ) }; - positional.extend(callee_receiver); - positional.extend((!matches!(slot, Object::Unbound)).then_some(slot)); - positional.extend(ops); - let gen = match &callee { - Object::Function(f) => self.start_generator_at(f, &code, positional, start), - Object::BoundMethod(bm) => { - let Object::Function(f) = &bm.function else { - unreachable!("checked above"); - }; - self.start_generator_at(f, &code, positional, start) - } + let (f, callee_receiver) = match &callee { + Object::Function(f) => (f, None), + Object::BoundMethod(bm) => match &bm.function { + Object::Function(f) => (f, Some(bm.receiver.clone())), + _ => unreachable!("checked above"), + }, _ => unreachable!("checked above"), }; - self.release(callee); + // Move the arguments onto the end of `v`. + // SAFETY: `args` holds `nargs` initialized values the stack forgot. + let take_args = |v: &mut Vec| unsafe { + v.reserve(nargs); + std::ptr::copy_nonoverlapping(args, v.as_mut_ptr().add(v.len()), nargs); + v.set_len(v.len() + nargs); + }; + // `await f(...)`: the coroutine starts as it is made (see below). + let await_send = if code.is_coroutine && self.inline_calls_ok() { + await_send_after(&frame.code, pc) + } else { + None + }; + let gen = if let Some(cells) = cells { + // The arguments move straight into the locals (no staging). + let nlocals = code.varnames.len(); + let locals = self.pooled_locals_empty(nlocals); + { + // SAFETY: sole owner (see `pooled_locals_empty`). + let v = unsafe { &mut *locals.as_ptr() }; + v.extend(callee_receiver); + if !matches!(slot, Object::Unbound) { + v.push(slot); + } + take_args(v); + let missing = (code.arg_count as usize).saturating_sub(v.len()); + if missing > 0 { + v.extend(f.defaults[f.defaults.len() - missing..].iter().cloned()); + } + v.resize(nlocals, Object::Unbound); + } + let mut gen_frame = Self::gen_frame_lean(f, code, locals, cells, start); + gen_frame.stack = self.pooled_stack(); + let code = Rc::clone(&gen_frame.code); + let boxed = self.box_gen_frame(gen_frame); + if await_send.is_some() { + // Tracked if it suspends (see `PyGenerator::track_deferred`), + // or below if it doesn't start. + let obj = Self::make_started_generator(f, &code, boxed); + if let Object::Coroutine(g) = &obj { + g.track_deferred.set(true); + } + obj + } else { + Self::wrap_started_generator(f, &code, boxed) + } + } else { + let mut positional = self.pooled_scratch(); + positional.extend(callee_receiver); + if !matches!(slot, Object::Unbound) { + positional.push(slot); + } + take_args(&mut positional); + self.start_generator_at(f, &code, positional, start) + }; + match callee { + // A function something else still holds (its module, its + // class) can't die here: a plain decrement. + Object::Function(f) if Rc::strong_count(&f) > 1 => drop(f), + callee => self.release(callee), + } + let deferred = matches!(&gen, Object::Coroutine(g) if g.track_deferred.get()); frame.stack.push(gen); frame.pc = pc as u32 + 1; // SAFETY: the running activation's last-pc slot. unsafe { *sw.last = pc }; + // `await f(...)`: the coroutine starts at once, as the `SEND` after + // its `GET_AWAITABLE` (which passes a fresh coroutine through) would + // start it with the `None` sent. The caller rests at the `SEND`, + // where the coroutine's return lands; the caller of this function + // finds the switch in `sw`. + let caller: *mut Frame = frame; // SAFETY: the running thread's own flag (see `quiet_run`). - if unsafe { (*sw.maybe_dead).get() } { + let started = if unsafe { (*sw.maybe_dead).get() } { sw.pending = Some(CoreExit::Stop(LeafStop::Marked)); + false + } else if let Some(send_pc) = await_send { + // SAFETY: as above (the `LOAD_CONST` before the `SEND`). + unsafe { *sw.last = send_pc - 1 }; + let started = self.core_await_enter(sw, send_pc); + if !started { + // SAFETY: as above. + unsafe { *sw.last = pc }; + } + started + } else { + false + }; + if deferred && !started { + // SAFETY: as above. + if let Some(obj @ Object::Coroutine(g)) = unsafe { (*caller).stack.last() } { + g.track_deferred.set(false); + gc_trace::track_generator(obj); + } + } + true + } + + /// The `await` (its `SEND` at `send_pc`) of the coroutine atop `sw`'s + /// running activation, which the activation's call just made: started + /// at once as the `SEND` would start it (`try_inline_gen`'s `Send` + /// resume, whose checks a fresh coroutine passes but for its code's), + /// the caller resting past the `SEND`. `false` touches nothing. + fn core_await_enter(&mut self, sw: &mut CoreSwitch, send_pc: usize) -> bool { + let mut tmp = None; + // SAFETY: see `CoreSwitch` (as in `core_gen_resume_one`). + let (frame, shell) = unsafe { + let depth = (*sw.inl).len(); + let (frame, _, shell) = sw.activation(depth, &mut tmp); + (&mut *frame, &mut *shell.cast::>()) + }; + let Some(Object::Coroutine(g)) = frame.stack.last() else { + return false; + }; + let g = g.clone(); + // SAFETY: just made; nothing else reaches its state yet. + let state = unsafe { &mut *g.state().as_ptr() }; + if !matches!(state, GeneratorState::Created(boxed) if Self::lean_gen_code_ok(&boxed.code)) { + return false; } + // Past the recursion limit the `SEND` raises. + let crate::recursion::Enter::Ok(guard) = crate::recursion::enter_with(sw.depth_cell) else { + return false; + }; + let GeneratorState::Created(boxed) = std::mem::replace(state, GeneratorState::Running) + else { + unreachable!("checked above"); + }; + let jump = frame.code.instructions[send_pc].arg; + let act = self.inline_gen_commit( + frame, + shell, + send_pc, + InlineResume::Send, + jump | GEN_SEND, + (g, boxed, true, Object::None), + guard, + ); + let gen_frame = act.gen_frame; + // SAFETY: as above. + unsafe { push_fast(&mut *sw.inl, act) }; + sw.cur = gen_frame; + sw.scratch = usize::MAX; + sw.last = &raw mut sw.scratch; true } @@ -57172,6 +60942,15 @@ impl Interpreter { /// Import `module` and fetch one of its top-level attributes by name. /// Returns `None` if the module can't be imported or lacks the name. pub(crate) fn module_attr(&mut self, module: &str, attr: &str) -> Option { + // An imported top-level module that no thread is initializing: its + // attribute straight off the `sys.modules` entry (what `load_one` + // returns for it), without the dotted walk's bookkeeping. + // `object.__reduce_ex__` reads `copyreg.__newobj__` this way. + if !module.contains('.') && self.cache.initializing_holder(module).is_none() { + if let Some(Object::Module(m)) = self.cache.get(module) { + return m.dict.borrow().get(&crate::object::StrKey(attr)).cloned(); + } + } let m = self.import_path(module).ok()?; if let Object::Module(m) = m { return m.dict.borrow().get(&crate::object::StrKey(attr)).cloned(); @@ -57470,6 +61249,10 @@ impl Interpreter { &mut self, recv: &Object, ) -> Result, RuntimeError> { + // (No class of these is subclassable: an instance is none of them.) + if matches!(recv, Object::Instance(_)) { + return Ok(None); + } let ty_name = crate::builtins::class_of(recv).name.clone(); if !matches!( ty_name.as_str(), @@ -57608,31 +61391,40 @@ impl Interpreter { return None; } let cls = inst.cls(); - let slots_key = crate::object::StrKey("__slots__"); - if cls - .mro - .borrow() - .iter() - .any(|c| c.dict.borrow().get(&slots_key).is_some()) - { - return None; - } - if cls.lookup("__getnewargs_ex__").is_some() || cls.lookup("__getnewargs__").is_some() { + // (A pure function of the class's attributes: memoized.) + let plain = cls.memo_verdict(crate::types::Verdict::PlainNewobj, "", || { + let slots_key = crate::object::StrKey("__slots__"); + if cls + .mro + .borrow() + .iter() + .any(|c| c.dict.borrow().get(&slots_key).is_some()) + { + return false; + } + if cls.lookup("__getnewargs_ex__").is_some() || cls.lookup("__getnewargs__").is_some() { + return false; + } + let Some(default_getstate) = builtin_types() + .object_ + .dict + .borrow() + .get(&crate::object::StrKey("__getstate__")) + .cloned() + else { + return false; + }; + // (The class lookup skips `object`'s own entry: none found is + // the default too.) + match (cls.lookup("__getstate__"), &default_getstate) { + (None, _) => true, + (Some(Object::Builtin(a)), Object::Builtin(b)) => Rc::ptr_eq(&a, b), + _ => false, + } + }); + if !plain { return None; } - let default_getstate = builtin_types() - .object_ - .dict - .borrow() - .get(&crate::object::StrKey("__getstate__")) - .cloned()?; - // (The class lookup skips `object`'s own entry: none found is the - // default too.) - match (cls.lookup("__getstate__"), &default_getstate) { - (None, _) => {} - (Some(Object::Builtin(a)), Object::Builtin(b)) if Rc::ptr_eq(&a, b) => {} - _ => return None, - } let newobj = self.module_attr("copyreg", "__newobj__")?; let dict = inst.dict_shared(); let state = if dict.try_borrow().ok()?.is_empty() { @@ -60165,11 +63957,15 @@ impl Interpreter { { frozen_code_cache::insert(full, &code); // RFC 0059 WS5a — persist for future processes as well. - // `-B`/`PYTHONDONTWRITEBYTECODE` suppresses the write like - // any other bytecode artifact (reads stay enabled). - if !self.bytecode_writes_disabled() { - frozen_code_cache::write_disk(full, source, &code); - } + // `-B`/`PYTHONDONTWRITEBYTECODE` doesn't suppress the write: + // it governs `.pyc` files beside source files, and CPython + // ships its standard library already compiled, so this cache + // (in the user's cache directory, keyed by the binary's + // format) is the counterpart of that installed bytecode. + // Without it, every process under `-B` compiled each stdlib + // module it imported (`import asyncio`: about 5x the + // instructions). `WEAVEPY_FROZEN_CACHE=0` turns it off. + frozen_code_cache::write_disk(full, source, &code); } self.run_frozen_compiled(full, code, is_package, filename) } @@ -63668,6 +67464,8 @@ enum LeafKind { GetAttr, ListAppend, ListPop, + /// `list.extend` of an exact list or tuple. + ListExtend, ListInsert, ListReverse, ListCopy, @@ -63720,6 +67518,7 @@ impl LeafKind { | Self::SetAdd | Self::ListAppend | Self::ListPop + | Self::ListExtend | Self::ListInsert | Self::ListReverse | Self::ListCopy @@ -63991,11 +67790,65 @@ struct InlineAct { discard: bool, /// A collapsed `yield from` chain (see /// `Interpreter::core_send_collapse`): the generators between the - /// consumer and the one this activation runs, outermost first. The - /// activation's consumer-facing fields (`call_pc`, `exhaust_arg`, - /// `caller_pending`) are the consumer's. Empty otherwise; a pooled - /// slot keeps the buffer. - delegates: Vec, + /// consumer and the one this activation runs, outermost first (never + /// none). The activation's consumer-facing fields (`call_pc`, + /// `exhaust_arg`, `caller_pending`) are the consumer's. + chain: Option>, +} + +/// The levels of a collapsed `yield from` chain (see +/// `Interpreter::core_send_collapse`), outermost first, each in +/// [`GeneratorState::Delegating`] with the record's address in its +/// [`PyGenerator::chain`]. While the chain runs, the activation of its +/// innermost generator owns the record ([`InlineAct::chain`]). When that +/// generator yields, the chain parks (`Interpreter::collapse_park`): the +/// record owns itself and the levels stay delegating, as if each had +/// passed the value up and resumed straight back into its `SEND`. The +/// next `SEND` of `None` to the outermost level resumes the innermost +/// generator directly (`Interpreter::core_send_unpark`); anything else +/// that reaches a level's state first settles the chain +/// ([`settle_parked_chain`]), suspending each level in its `yield from`. +struct ChainRec { + levels: Vec, + /// Parked (see above), or owned by a running activation. + parked: bool, + /// Where the levels' entries start on the pending list while the + /// chain runs unflushed (see `Interpreter::collapse_flushed`). + pend_at: usize, + /// The outermost level, while the chain runs for a `next()` call + /// (whose operands held it); otherwise its holder is the consumer's + /// stack, or (parked) whoever holds it. + hold: Option>, +} + +// SAFETY: a record moves between threads with its generators, under the +// GIL; a pooled one is empty. +unsafe impl Send for ChainRec {} + +/// Settle the parked chain whose record is at `addr` (see [`ChainRec`]): +/// each level suspends in its `yield from`, as resuming the chain level +/// by level leaves it. A running chain's record is left alone (its +/// levels are executing). +#[cold] +#[inline(never)] +pub(crate) fn settle_parked_chain(addr: usize) { + // SAFETY: a level's `chain` names a live record: whoever ends the + // record clears it on every level first. + unsafe { + let rec = addr as *mut ChainRec; + if !(*rec).parked { + return; + } + let rec = Box::from_raw(rec); + // (Innermost first: a level's state is only read through the + // level above, which is still delegating meanwhile.) + for level in rec.levels.iter().rev() { + // The levels are alive (each held by the one above, the + // outermost by its owners) and parked: nothing borrows their + // state. + level.suspend(); + } + } } /// One suspended level of a collapsed `yield from` chain (see @@ -64015,19 +67868,22 @@ struct Delegate { } impl Delegate { - /// Put the level's generator back in `Suspended`, at its `RESUME`. + /// Put the level's generator back in `Suspended`, at its `RESUME`, + /// out of its chain. /// /// # Safety /// /// The generator is alive and in `Delegating`, with no borrow of its /// state live. unsafe fn suspend(&self) { + // SAFETY: alive (the caller's contract). + unsafe { (*self.gen).chain.set(0) }; // SAFETY: the frame lives in the generator's box (see above). unsafe { (*self.act.frame).pc = self.send_pc as u32 + 2 }; // SAFETY: the caller's contract; the box moves between variants // without drop glue. unsafe { - let st = (*self.gen).state.as_ptr(); + let st = (*self.gen).state_raw().as_ptr(); let GeneratorState::Delegating(boxed) = std::ptr::read(st) else { unreachable!("a collapsed level is delegating"); }; @@ -64081,7 +67937,7 @@ impl InlineAct { direct: false, binop: None, discard: false, - delegates: Vec::new(), + chain: None, }); act.act.frame = std::ptr::from_mut::(&mut act.frame); // SAFETY: parked slots hold a stale code copy (see the type docs): @@ -64099,10 +67955,12 @@ unsafe impl Send for InlineAct {} impl Drop for InlineAct { fn drop(&mut self) { // An activation torn down mid-chain leaves its levels suspended. - for level in self.delegates.drain(..).rev() { - // SAFETY: the levels are alive (see `Delegate::gen`) and - // delegating; nothing borrows their state during a drop. - unsafe { level.suspend() }; + if let Some(rec) = self.chain.take() { + for level in rec.levels.iter().rev() { + // SAFETY: the levels are alive (see `Delegate::gen`) and + // delegating; nothing borrows their state during a drop. + unsafe { level.suspend() }; + } } if self.owns_cells { // SAFETY: owned cells are released once (the frame's own drop @@ -64157,7 +68015,28 @@ const GEN_NEXT_CALL: u32 = u32::MAX; /// Set in [`InlineAct::exhaust_arg`] (with the `SEND`'s jump below it) for /// a sub-generator resumed by `yield from` or `await`: exhaustion leaves /// its return value on the delegator's stack and takes the jump. -const GEN_SEND: u32 = 1 << 31; +pub(crate) const GEN_SEND: u32 = 1 << 31; + +/// [`InlineAct::exhaust_arg`] of a generator resumed by `next(gen, +/// default)`: the default waits atop the caller's stack, replaced by a +/// yielded value, or left as the call's result when the generator +/// finishes. (Checked before [`GEN_SEND`], whose bit it has.) +const GEN_NEXT_DEFAULT: u32 = u32::MAX - 1; + +/// How [`Interpreter::chain_step`] went. +enum ChainStep { + /// Nothing happened. + No, + /// The innermost generator yielded, its value delivered to the + /// consumer: the chain parks again. + Delivered, + /// The innermost generator returned into the innermost level, now the + /// chain's innermost generator (its frame), to run. + Inner(*const PyGenerator, *mut Frame), + /// The innermost generator returned into the chain's only level, out + /// of the chain: the consumer resumes it as usual. + Resume, +} /// How [`Interpreter::core_send_hop`] went. #[derive(Clone, Copy, PartialEq, Eq)] @@ -64179,6 +68058,10 @@ enum InlineResume { ForIter, /// A `CALL` of builtin `next` on the generator at the top of the stack. NextCall, + /// A `CALL` of builtin `next` on a generator with a default (the top + /// of the stack): as [`Self::NextCall`], but exhaustion gives the + /// default. + NextDefault, /// `SEND` of the value at the top of the stack to the generator or /// coroutine below it (`yield from`, `await`). Send, @@ -64278,6 +68161,13 @@ struct CoreSwitch { /// The observer generation the burst started under (see /// [`Interpreter::core_pending_exit`]). obs_gen: u64, + /// `Interpreter::inline_calls_ok` when the burst started: its inputs + /// hold for a burst (a native stack's greenlet, the process's flags) + /// or bump the loop generation when they change (the eval-frame + /// recorder), which every direct call compares first. + calls_ok: bool, + /// The loop generation the burst runs under (see `quiet_run`). + snap_gen: u64, } impl CoreSwitch { @@ -64287,6 +68177,8 @@ impl CoreSwitch { frame: &mut Frame, shell: &mut QuietShell<'_>, last: &mut usize, + calls_ok: bool, + snap_gen: u64, ) -> Self { let frame: *mut Frame = frame; let shell: *mut QuietShell<'static> = std::ptr::from_mut(shell).cast(); @@ -64311,6 +68203,8 @@ impl CoreSwitch { maybe_dead: roots.maybe_dead, depth_cell: crate::recursion::depth_cell(), obs_gen: crate::trace::observer_gen(), + calls_ok, + snap_gen, } } @@ -64699,6 +68593,22 @@ fn yield_from_resend(instrs: &[weavepy_compiler::Instruction], pc: usize) -> Opt (instrs.get(target)?.op == OpCode::Send).then_some(target) } +/// The `SEND` of an `await` of the `CALL` at `pc`'s result: the call is +/// followed by `GET_AWAITABLE 0; LOAD_CONST None; SEND`. +#[inline] +pub(crate) fn await_send_after(code: &CodeObject, pc: usize) -> Option { + let [get, none, send] = code.instructions.get(pc + 1..pc + 4)? else { + return None; + }; + (get.op == OpCode::GetAwaitable + && get.arg == 0 + && none.op == OpCode::LoadConst + && matches!(code.constants.get(none.arg as usize), Some(Constant::None)) + && send.op == OpCode::Send + && send.arg & GEN_SEND == 0) + .then_some(pc + 3) +} + /// Move the object at `src` to `dst` as one 16-byte copy: a move through /// a typed value (`pop` then `push`) splits it at the tag byte, and the /// 16-byte reload that follows stalls on store forwarding. @@ -64756,8 +68666,41 @@ unsafe fn release_locals(locals: &mut Vec) { // SAFETY: the first `n` values are initialized. unsafe { locals.set_len(0); + release_run(base, n); + } +} + +/// Release the `n` values from `base` on (each read out once), as +/// [`drop_hot`] releases one: the bias is tested once for the run, and a +/// shared owner's decrement reads only the tag and the pointer (a moved +/// out copy of each value showed in every return's profile). +/// +/// # Safety +/// +/// The `n` values are initialized, owned by the caller, and never read +/// again. +#[inline(always)] +pub(crate) unsafe fn release_run(base: *const Object, n: usize) { + // SAFETY: the caller's contract. + unsafe { + if !crate::rc::refcounts_biased() { + for k in 0..n { + drop(base.add(k).read()); + } + return; + } for k in 0..n { - drop_hot(base.add(k).read()); + let at = base.add(k); + if let Some(word) = (*at).strong_word() { + // While the bias holds this thread alone updates counts. + let w = &*word; + let c = w.load(std::sync::atomic::Ordering::Relaxed); + if c != 1 { + w.store(c - 1, std::sync::atomic::Ordering::Relaxed); + } else { + drop(at.read()); + } + } } } } @@ -65050,8 +68993,17 @@ mod burst_stats { static CALLS: [AtomicU64; 8] = [const { AtomicU64::new(0) }; 8]; /// Count one call taking path `i` (one of the `CALL_*` constants). - #[inline] + /// (Every call path counts: off, it's one load in line.) + #[inline(always)] pub(crate) fn note_call(i: usize) { + if ENABLED.load(Ordering::Relaxed) != 0 { + note_call_slow(i); + } + } + + #[cold] + #[inline(never)] + fn note_call_slow(i: usize) { if enabled() { CALLS[i].fetch_add(1, Ordering::Relaxed); } @@ -65282,6 +69234,60 @@ fn is_object_new(b: &Rc) -> bool { Rc::as_ptr(b) as usize == want } +/// Move `n` objects from `src` to `dst` (non-overlapping): a call's few +/// arguments in straight-line code, without the unrolled loop's +/// prologue and remainder. +/// +/// # Safety +/// +/// `src` holds `n` initialized objects the caller forgets; `dst` has room +/// for `n`. +#[inline(always)] +unsafe fn move_objects(src: *const Object, dst: *mut Object, n: usize) { + // SAFETY: the caller's contract. + unsafe { + match n { + 0 => {} + 1 => dst.write(src.read()), + 2 => { + dst.write(src.read()); + dst.add(1).write(src.add(1).read()); + } + 3 => { + dst.write(src.read()); + dst.add(1).write(src.add(1).read()); + dst.add(2).write(src.add(2).read()); + } + _ => std::ptr::copy_nonoverlapping(src, dst, n), + } + } +} + +/// Write `n` unbound markers from `dst` (a frame's unset locals). +/// +/// # Safety +/// +/// `dst` has room for `n` objects, whose old contents need no drop. +#[inline(always)] +unsafe fn fill_unbound_raw(dst: *mut Object, n: usize) { + // SAFETY: the caller's contract; `Unbound` owns nothing. + unsafe { + match n { + 0 => {} + 1 => dst.write(Object::Unbound), + 2 => { + dst.write(Object::Unbound); + dst.add(1).write(Object::Unbound); + } + _ => { + for k in 0..n { + dst.add(k).write(Object::Unbound); + } + } + } + } +} + /// Extend `v` to `n` slots with `Unbound` (the fresh locals of an /// activation), in line: a call's handful of slots isn't worth /// `Vec::resize`'s out-of-line loop. @@ -65345,10 +69351,8 @@ enum DictStep { enum CoreExit { /// End the burst. Stop(LeafStop), - /// The instruction at `frame.pc` runs out of line - /// (`leaf_core_helper`). - Helper, - /// The instruction at `frame.pc` needs the full leaf arms. + /// The instruction at `frame.pc` needs the full leaf arms (see + /// [`Interpreter::core_offload`]). Slow, /// (Inside [`Interpreter::leaf_core`] only.) An in-loop call or /// return synced and moved the running activation: reload. @@ -65360,6 +69364,21 @@ enum CoreExit { Switch, } +/// [`Interpreter::core_offload_run`]'s modes: an out-of-line instruction +/// (the helper, then its lanes), a handoff that may take a lane before the +/// full leaf arms, and one only the full leaf arms run. +const OFFLOAD_HELPER: u8 = 0; +const OFFLOAD_SLOW: u8 = 1; +const OFFLOAD_ARMS: u8 = 2; + +/// The core loop's view of its running activation as it hands an +/// instruction over in place (see [`Interpreter::core_offload_in_loop`]). +struct CoreAt { + len: usize, + pc: usize, + last: usize, +} + /// How [`Interpreter::leaf_core_attr`] ran its instruction. enum CoreAttr { /// Executed. @@ -65495,6 +69514,7 @@ static CORE_LEAF_OPS: [bool; 256] = { OpCode::LoadDeref, OpCode::BuildList, OpCode::ContainsOp, + OpCode::UnaryOp, ]; let mut i = 0; while i < ops.len() { @@ -65621,7 +69641,7 @@ pub(crate) fn callable_function_str(callable: &Object) -> Option { .slot("__qualname__") .as_ref() .map(Object::to_str) - .unwrap_or_else(|| f.code().qualname.clone()); + .unwrap_or_else(|| f.code().qualname.to_string()); let module = f.slot("__module__").as_ref().map(Object::to_str); match module { Some(m) if !m.is_empty() && m != "builtins" => Some(format!("{m}.{qual}()")), @@ -65726,55 +69746,26 @@ thread_local! { > = std::cell::RefCell::new(crate::fasthash::FxHashMap::default()); } -/// Attribute names a built-in type was found to lack. Built-in types are -/// immutable, so a miss is permanent, and `hasattr` can answer a repeat -/// without raising (asyncio's `isfuture` asks -/// `hasattr(type(coro), '_asyncio_future_blocking')` for every coroutine -/// it's handed). Their attributes resolve dynamically, so a first miss -/// must still go through the full lookup. Entries are keyed by address -/// and hold the type weakly, which keeps the address from being reused. -mod builtin_type_misses { - use std::cell::RefCell; - - use crate::fasthash::{FxHashMap, FxHashSet}; - use crate::sync::{Rc, Weak}; - use crate::types::TypeObject; - - /// Past this many names the record starts over (a bound, not a cache - /// policy: real programs probe a handful of names). - const CAP: usize = 512; - - type Misses = FxHashMap, FxHashSet>)>; - - thread_local! { - static MISSES: RefCell<(usize, Misses)> = RefCell::new((0, FxHashMap::default())); - } - - pub(super) fn contains(ty: &Rc, name: &str) -> bool { - MISSES.with(|m| { - m.borrow() - .1 - .get(&(Rc::as_ptr(ty) as usize)) - .is_some_and(|(w, names)| w.strong_count() > 0 && names.contains(name)) - }) - } - - pub(super) fn insert(ty: &Rc, name: &str) { - MISSES.with(|m| { - let mut m = m.borrow_mut(); - let (count, map) = &mut *m; - if *count >= CAP { - *count = 0; - map.clear(); - } - let entry = map - .entry(Rc::as_ptr(ty) as usize) - .or_insert_with(|| (Rc::downgrade(ty), FxHashSet::default())); - if entry.1.insert(name.into()) { - *count += 1; - } - }); - } +/// The built-in class whose attributes are all of `obj`'s: a value of a +/// built-in type that carries none of its own (no instance dict, no +/// per-object attribute store), so what `obj.name` resolves to depends on +/// the class and the name alone. `None` for anything else. +fn builtin_value_class(obj: &Object) -> Option> { + matches!( + obj, + Object::None + | Object::Bool(_) + | Object::Int(_) + | Object::Float(_) + | Object::Str(_) + | Object::Bytes(_) + | Object::Tuple(_) + | Object::List(_) + | Object::Dict(_) + | Object::Set(_) + | Object::FrozenSet(_) + ) + .then(|| crate::builtins::class_of(obj)) } /// Whether `obj.name` certainly raises `AttributeError` without running @@ -65783,6 +69774,48 @@ mod builtin_type_misses { /// `getattr` default or `hasattr` then needs no exception at all. Dunder /// names, which the lookup special-cases, never qualify. fn attr_certainly_missing(obj: &Object, name: &str) -> bool { + default_lookup_misses(obj, name, false) +} + +/// `PyObject_GetAttr`'s augmentation of a propagating `AttributeError` +/// (`exc`) with `.name` and `.obj`, for one built natively, whose storage +/// lays both fields out (see `error::attribute_error`): stored in place +/// when neither is set. `true` once settled; `false` leaves the decision +/// to the general path (any other storage, or attributes in a `__dict__`). +fn attr_error_context_laid_out(exc: &PyInstance, obj: &Object, name: &str) -> bool { + if exc.attr_count() != 0 { + return false; + } + // (Noted before the slots are borrowed: the exception holds `obj` + // from here on, or already holds another one.) + exc.note_slot_store(obj); + let Ok(mut slots) = exc.slots.try_borrow_mut() else { + return false; + }; + let Some((name_at, obj_at)) = slots.laid_out_pair_mut("name", "obj") else { + return false; + }; + let unset = |v: &Object| matches!(v, Object::Unbound | Object::None); + if !(unset(name_at) && unset(obj_at)) { + return true; + } + // (A `str` needs no note.) + let name = Object::from_str(name); + let old = [ + std::mem::replace(name_at, name), + std::mem::replace(obj_at, obj.clone()), + ]; + drop(slots); + drop(old); + true +} + +/// Whether the default `object.__getattribute__` lookup of `obj.name` +/// certainly ends in its `AttributeError` without running any code (see +/// [`attr_certainly_missing`]), ignoring a `__getattr__` hook on the class +/// when `hooked` (the caller then calls the hook itself, as CPython's +/// `slot_tp_getattr_hook` does after a suppressed generic lookup). +fn default_lookup_misses(obj: &Object, name: &str, hooked: bool) -> bool { use crate::types::Dunder; let Object::Instance(inst) = obj else { return false; @@ -65792,29 +69825,45 @@ fn attr_certainly_missing(obj: &Object, name: &str) -> bool { return false; } let cls = inst.cls(); - if cls.native_kind.get() != 0 - || !cls.dunder(Dunder::GetAttribute).object_owner() - || cls.dunder(Dunder::GetAttr).present() - || cls.lookup(name).is_some() - { + if cls.native_kind.get() != 0 { return false; } - // A dunder may also come from a builtin base's slot (`__repr__`, - // `__reduce_ex__`), or be an instance-level special; one that none - // supplies (`__deepcopy__`, which `copy` probes) is missing. - if dunder { - let special = matches!( - name, - "__class__" | "__dict__" | "__weakref__" | "__doc__" | "__module__" - ); - let builtin_base = cls - .mro - .borrow() - .iter() - .any(|t| t.flags.is_builtin && t.name != "object"); - if special || builtin_base || builtin_slot_wrapper(&cls, name).is_some() { + // (A builtin class's hook, a weak proxy's among them, may stand in for + // special cases of the default lookup.) + let hook = cls.dunder(Dunder::GetAttr).present(); + if hook && (!hooked || cls.flags.is_builtin) { + return false; + } + // The class's part of the verdict depends only on its attributes + // (memoized until it or a base changes). + let class_missing = cls.memo_verdict(crate::types::Verdict::AttrMissing, name, || { + if !cls.dunder(Dunder::GetAttribute).object_owner() + || cls.is_super_proxy_type() + || cls.lookup(name).is_some() + { return false; } + // A dunder may also come from a builtin base's slot (`__repr__`, + // `__reduce_ex__`), or be an instance-level special; one that none + // supplies (`__deepcopy__`, which `copy` probes) is missing. + if dunder { + let special = matches!( + name, + "__class__" | "__dict__" | "__weakref__" | "__doc__" | "__module__" + ); + let builtin_base = cls + .mro + .borrow() + .iter() + .any(|t| t.flags.is_builtin && t.name != "object"); + if special || builtin_base || builtin_slot_wrapper(&cls, name).is_some() { + return false; + } + } + true + }); + if !class_missing { + return false; } match inst.dict.published() { Some(d) => d @@ -65851,6 +69900,18 @@ pub(crate) fn builtin_slot_wrapper(ty: &Rc, name: &str) -> Option Object::None, }); } + // A name no builtin base supplies (the common case: the rescue of every + // failed instance lookup asks) is settled once per class version. + if ty.memo_verdict(crate::types::Verdict::NoSlotWrapper, name, || { + builtin_slot_wrapper_walk(ty, name).is_none() + }) { + return None; + } + builtin_slot_wrapper_walk(ty, name) +} + +/// [`builtin_slot_wrapper`]'s walk of `ty`'s builtin bases. +fn builtin_slot_wrapper_walk(ty: &Rc, name: &str) -> Option { for base in ty.mro.borrow().iter() { if !base.flags.is_builtin { continue; @@ -66015,8 +70076,13 @@ pub(crate) fn attr_name_of(o: &Object) -> Option { } } -fn attr_name_arg(o: Option<&Object>) -> Option { - o.and_then(attr_name_of) +/// A `getattr`/`hasattr` name argument (see [`attr_name_of`]), borrowing a +/// plain `str`. +fn attr_name_cow(o: Option<&Object>) -> Option> { + match o? { + Object::Str(s) => Some(std::borrow::Cow::Borrowed(&**s)), + other => attr_name_of(other).map(std::borrow::Cow::Owned), + } } /// `True` when `o` is a `StopAsyncIteration` instance (or one of @@ -66137,6 +70203,20 @@ unsafe fn core_gen_method(code: &CodeObject, name_idx: u32, top: *mut Object) -> else { return false; }; + // `gen.send(v)`: the unbound method and the generator as its self (the + // `CALL` passes it as the first argument), with no bound method made; + // the `CALL` arms resume the generator inline. + if name == "send" { + // SAFETY: the caller's contract. + let coro = matches!(unsafe { &*top }, Object::Coroutine(_)); + // SAFETY: the generator moves up to the self slot, which is free. + unsafe { + let gen = top.read(); + top.write(gen_send_unbound(coro)); + top.add(1).write(gen); + } + return true; + } // SAFETY: the caller's contract. let bm = make_gen_method(name, unsafe { &*top }); // SAFETY: the generator (held by the bound method too) is replaced in @@ -66148,6 +70228,43 @@ unsafe fn core_gen_method(code: &CodeObject, name_idx: u32, top: *mut Object) -> true } +/// `send`'s one argument (CPython's `METH_O`): `n` given to `receiver`'s. +fn gen_send_arity(receiver: &Object, n: usize) -> Result<(), RuntimeError> { + if n == 1 { + return Ok(()); + } + let kind = match receiver { + Object::Coroutine(_) => "coroutine", + _ => "generator", + }; + Err(type_error(format!( + "{kind}.send() takes exactly one argument ({n} given)" + ))) +} + +/// The unbound `send` of generators (or coroutines) that a method load of +/// `gen.send` pushes (see [`core_gen_method`]): the `.u.` sentinel a +/// type's attribute gives (`type(gen).send`), which `Interpreter::call` +/// runs with its first argument as the receiver. One per kind, shared. +fn gen_send_unbound(coro: bool) -> Object { + static METHODS: [std::sync::OnceLock; 2] = [const { std::sync::OnceLock::new() }; 2]; + METHODS[usize::from(coro)] + .get_or_init(|| { + Object::Builtin(Rc::new(BuiltinFn { + name: if coro { ".u.cor_send" } else { ".u.gen_send" }, + binds_instance: false, + call: Box::new(|_args| { + Err(RuntimeError::Internal( + "unbound generator method must be dispatched via Interpreter::call" + .to_owned(), + )) + }), + call_kw: None, + })) + }) + .clone() +} + fn make_gen_method(name: &str, receiver: &Object) -> Object { fn unreachable_call(_args: &[Object]) -> Result { Err(RuntimeError::Internal( @@ -67408,6 +71525,11 @@ fn percent_format_leaf_mapping(template: &str, value: &Object) -> Option }; let bytes = template.as_bytes(); let map = d.try_borrow().ok()?; + // The plain shape (`logging`'s `%(asctime)s %(levelname)s ...`), in + // one pass. + if let Some(out) = percent_render_plain(template, PercentArgs::Mapping(&map)) { + return Some(out); + } let mut i = 0; while let Some(off) = bytes[i..].iter().position(|&b| b == b'%') { i += off + 1; @@ -67450,7 +71572,97 @@ fn percent_format_leaf_mapping(template: &str, value: &Object) -> Option percent_format(template, value).ok() } +/// The arguments [`percent_render_plain`] renders from. +enum PercentArgs<'a> { + Positional(&'a [Object]), + Mapping(&'a DictData), +} + +/// `template % args` in one pass when every conversion is a plain `%s`, +/// `%d` or `%i` (no flags, width or precision; a mapping key for a +/// mapping, none for positional arguments) of an exact `str`, `int`, +/// `bool` or `None` (`%s` only for `str`, `None`), and every positional +/// argument is consumed: the text `percent_format_with` renders for that +/// shape. `None` for anything else (the general path then renders it, or +/// raises), including a mapping key the dictionary lacks. +fn percent_render_plain(template: &str, args: PercentArgs<'_>) -> Option { + use std::fmt::Write as _; + let bytes = template.as_bytes(); + let mut out = String::with_capacity(template.len() + 32); + let (mut i, mut lit, mut next) = (0, 0, 0); + while let Some(off) = memchr::memchr(b'%', &bytes[i..]) { + let at = i + off; + out.push_str(&template[lit..at]); + let mut k = at + 1; + let v = match (bytes.get(k)?, &args) { + (b'%', _) => { + out.push('%'); + i = k + 1; + lit = i; + continue; + } + (b'(', PercentArgs::Mapping(map)) => { + let close = k + 1 + memchr::memchr(b')', &bytes[k + 1..])?; + let key = &template[k + 1..close]; + if key.contains('(') { + return None; + } + k = close + 1; + map.get(&crate::object::StrKey(key))? + } + (_, PercentArgs::Positional(items)) => { + let v = items.get(next)?; + next += 1; + v + } + _ => return None, + }; + match (bytes.get(k)?, v) { + (b's', Object::Str(s)) => out.push_str(s), + (b's' | b'd' | b'i', Object::Int(n)) => { + let _ = write!(out, "{n}"); + } + (b's', Object::Bool(b)) => out.push_str(if *b { "True" } else { "False" }), + (b'd' | b'i', Object::Bool(b)) => out.push(if *b { '1' } else { '0' }), + (b's', Object::None) => out.push_str("None"), + _ => return None, + } + i = k + 1; + lit = i; + } + if let PercentArgs::Positional(items) = args { + if next != items.len() { + return None; + } + } + out.push_str(&template[lit..]); + Some(out) +} + +/// [`percent_render_plain`] of `template % value` for an argument tuple, +/// a lone scalar argument or an exact dict. +fn percent_render_plain_value(template: &str, value: &Object) -> Option { + let one; + let items: &[Object] = match value { + Object::Tuple(items) if !items.is_empty() => items, + Object::Str(_) | Object::Int(_) | Object::Bool(_) | Object::None => { + one = [value.clone()]; + &one + } + Object::Dict(d) => { + let map = d.try_borrow().ok()?; + return percent_render_plain(template, PercentArgs::Mapping(&map)); + } + _ => return None, + }; + percent_render_plain(template, PercentArgs::Positional(items)) +} + pub(crate) fn percent_format(template: &str, value: &Object) -> Result { + // The plain shape (`"warning number %d of %s" % (i, s)`). + if let Some(out) = percent_render_plain_value(template, value) { + return Ok(out); + } let mut noop = |_: &Object, _: char| Ok(None); percent_format_with(template, value, PercentMode::Str, &mut noop) } @@ -69196,6 +73408,9 @@ fn format_bigint_hex(b: &num_bigint::BigInt, upper: bool, p: &ParsedSpec) -> Str /// rest (`'%.123456f'` matches CPython instead of aborting). fn fixed_core(mag: f64, prec: usize) -> String { const FIXED_PREC_CAP: usize = 1100; + if let Some(s) = fixed_core_word(mag, prec) { + return s; + } if prec <= FIXED_PREC_CAP { format!("{mag:.*}", prec) } else { @@ -69206,6 +73421,61 @@ fn fixed_core(mag: f64, prec: usize) -> String { } } +/// [`fixed_core`] in 128-bit integer arithmetic, for the common shapes: +/// at most 17 fractional digits of a magnitude below 2**63. The float is +/// `m * 2**e` exactly, so `mag * 10**prec` is `m * 10**prec` shifted by +/// `e`, rounded half to even on the exact remainder (the correctly +/// rounded answer the general formatter gives). `None` for any other +/// magnitude or precision. +fn fixed_core_word(mag: f64, prec: usize) -> Option { + if prec > 17 { + return None; + } + let bits = mag.to_bits(); + let exp_field = ((bits >> 52) & 0x7ff) as i32; + let frac = u128::from(bits & ((1u64 << 52) - 1)); + let (m, e) = if exp_field == 0 { + (frac, -1074) + } else { + (frac | 1 << 52, exp_field - 1075) + }; + let p10 = 10u128.pow(prec as u32); + let scaled = if e >= 0 { + // `m << e` stays below 2**63, and times `10**17` below 2**120. + if e > 10 { + return None; + } + (m << e) * p10 + } else if -e > 120 { + // Below 2**-68 the scaled value is under one half: it rounds to 0. + 0 + } else { + let sh = e.unsigned_abs(); + let num = m * p10; + let q = num >> sh; + let r = num & ((1u128 << sh) - 1); + let half = 1u128 << (sh - 1); + q + u128::from(r > half || (r == half && q & 1 == 1)) + }; + let digits = scaled.to_string(); + if prec == 0 { + return Some(digits); + } + let mut out = String::with_capacity(digits.len().max(prec + 1) + 1); + if digits.len() <= prec { + out.push('0'); + out.push('.'); + out.extend(std::iter::repeat_n('0', prec - digits.len())); + out.push_str(&digits); + } else { + let (int, frac) = digits.split_at(digits.len() - prec); + out.push_str(int); + out.push('.'); + out.push_str(frac); + } + Some(out) +} + /// `true` when every decimal digit in `core` is `'0'` (and there is at /// least one). Used to decide PEP 682 negative-zero coercion: a value that /// renders with all-zero digits *is* zero at this precision. @@ -69752,6 +74022,19 @@ fn binop_dunders(op: BinOpKind) -> (&'static str, &'static str) { } } +/// The comparison whose forward dunder is `op`'s reflected one. +fn cmp_swapped(op: CompareKind) -> CompareKind { + use CompareKind as C; + match op { + C::Eq => C::Eq, + C::NotEq => C::NotEq, + C::Lt => C::Gt, + C::LtE => C::GtE, + C::Gt => C::Lt, + C::GtE => C::LtE, + } +} + fn cmp_dunder(op: CompareKind) -> (&'static str, &'static str) { use CompareKind as C; match op { @@ -69897,6 +74180,44 @@ fn exception_init_call(b: &crate::object::BuiltinFn, recv: &Object) -> bool { b.name == "__init__" && matches!(recv, Object::Instance(i) if i.cls_raw().flags.is_exception) } +/// Whether the core loop's builtin lane may call the method body `b` on +/// `recv` (see `Interpreter::core_builtin_lane`): a body that binds +/// instances, and with `via_call` one whose receiver the interpreter's +/// dispatch knows by name. +#[inline] +fn lane_recv_ok(b: &crate::object::BuiltinFn, recv: &Object, via_call: bool) -> bool { + b.binds_instance + // (A site settled on a plain instance's native `__init__` may see + // a dict payload later, which the dispatch routes.) + && (via_call || b.name != "__init__" || native_init_call(b, recv)) + && (!via_call + || builtins::method_memo_tag(recv).is_some() + || exception_init_call(b, recv) + || (matches!(b.name, ".object_reduce_ex" | ".object_reduce") + && matches!(recv, Object::Instance(_)))) +} + +/// Whether `b` called on `recv` is a native `__init__` (`object.__init__`, +/// typically through `super().__init__()`) on a plain instance: no native +/// payload (a dict's routes through the dispatch) and not an exception +/// (see [`exception_init_call`]), so its body runs directly. +fn native_init_call(b: &crate::object::BuiltinFn, recv: &Object) -> bool { + b.name == "__init__" + && b.call_kw.is_none() + && matches!(recv, Object::Instance(i) if i.native.get().is_none() + && i.c_body.get() == 0 + && !i.cls_raw().flags.is_exception) +} + +/// The builtin function a bound method of one wraps, as its own callable. +#[cold] +fn bm_builtin(callable: &Object) -> Object { + match callable { + Object::BoundMethod(bm) => bm.function.clone(), + other => other.clone(), + } +} + /// Builtin type methods the interpreter dispatches by name (their bodies /// iterate or compare through it): the core loop calls one on its exact /// builtin receiver through [`Interpreter::call`] (see @@ -69925,7 +74246,10 @@ fn builtin_method_via_call(name: &str) -> bool { /// Builtin functions the core loop may call in place (see /// `Interpreter::builtin_lane`): common ones that never look at the /// calling frame, so the frame stack needn't be whole while they run. -/// (Python code they call makes it whole as it needs to.) +/// (Python code they call makes it whole as it needs to.) The `sys` +/// frame readers make it whole themselves (`sync_frame_spine`), the +/// calling activation waiting on the pending list with its `lasti` at the +/// call. fn builtin_fn_lane_ok(name: &str) -> bool { matches!( name, @@ -69953,6 +74277,12 @@ fn builtin_fn_lane_ok(name: &str) -> bool { | "monotonic_ns" | "heappush" | "heappop" | "heapify" | "heapreplace" | "heappushpop" | "bisect" | "bisect_left" | "bisect_right" | "insort" | "insort_left" | "insort_right" + // sys + | "_getframe" | "_getframemodulename" | "getrecursionlimit" + // warnings (which reads the whole stack, lean activations included) + | "warn" + // asyncio (`gather` reads the running loop's current task) + | "current_task" ) } @@ -70140,21 +74470,25 @@ struct CodeConstObjects { /// before falling back to a byte compare, and `STORE_ATTR` inserts /// the pooled key without a per-store pool lookup. name_objs: Vec, + /// Each instruction's rank among the code's *sites* (see + /// [`site_ranks`]), which index the per-site tables below, or + /// [`NO_SITE`]; built with the first of those tables. + site_ranks: std::sync::OnceLock>, /// RFC 0077 WS4: the resolved method per `LoadAttrMethod` site (see /// [`MethodSlot`]). Allocated on the first method-shape hit in this - /// code object, one slot per instruction so `cache_pc` indexes it. - method_slots: std::sync::OnceLock>, + /// code object. + method_slots: SiteSlots, /// The dict stamps a `LOAD_GLOBAL` site last validated against (see /// [`StampSlot`]); allocated on the first global hit in this code - /// object, one slot per instruction. - stamp_slots: std::sync::OnceLock>, + /// object. + stamp_slots: SiteSlots, /// Polymorphic instance-attribute entries per `LOAD_ATTR` site (see /// [`AttrPoly`]); allocated on the first polymorphic resolution in - /// this code object, one slot per instruction. - attr_poly: std::sync::OnceLock>, + /// this code object. + attr_poly: SiteSlots, /// Inline-call shapes per `CALL` site (see [`CallSlot`]); allocated /// on the first inline call in this code object. - call_slots: std::sync::OnceLock>, + call_slots: SiteSlots, /// Whether this code is a *pure leaf* (see [`code_is_pure_leaf`]): /// `0` not yet decided, `1` no, `2` general leaf, `3` argument return, /// `4` constant return, `5` small-int return, `6` attribute return, @@ -70167,17 +74501,24 @@ struct CodeConstObjects { leaf_tries: std::sync::atomic::AtomicU64, /// Per-instruction fused-pair kinds (see [`code_fast_pairs`]): `1` /// at a `LOAD_FAST` whose successor is another `LOAD_FAST`, `2` when - /// it is a `STORE_FAST`, `0` everywhere else. CPython's compiler - /// fuses exactly these pairs into one instruction and the decoder - /// splits them back apart; the core loop reads one byte to run the - /// pair as a single dispatch. Empty when the code has no pair. + /// it is a `STORE_FAST`, `3` and `4` for a branch on the local, the + /// receiver-fused kinds from [`FAST_METHOD`] on, `0` everywhere else. + /// CPython's compiler fuses the first pairs into one instruction and + /// the decoder splits them back apart; the core loop reads one byte to + /// run the pair as a single dispatch. Empty when the code has none. fast_pairs: std::sync::OnceLock>, /// Whether the code is a generator body fast steps run (see /// `gen_fast`): 0 not yet scanned, 1 no, 2 yes. gen_fast: std::sync::atomic::AtomicU8, + /// The `RETURN_GENERATOR` a generator-family call of the code starts + /// past (see `Interpreter::generator_start`): `0` not yet scanned, + /// `u32::MAX` none (the prologue holds something else), else its pc + /// plus one, with [`GEN_DELEGATES`] set for a body that awaits or + /// delegates (a `SEND`). + gen_start: std::sync::atomic::AtomicU32, /// Split-layout attribute shortcuts per `LOAD_ATTR` site (see /// [`FieldSlot`]); allocated on the first recorded one. - field_slots: std::sync::OnceLock>, + field_slots: SiteSlots, /// The `BINARY_OP` and `COMPARE_OP` sites the core loop has run on a /// natively served operand (see `stdlib::datetime_native`), for the /// frame compiler to send through its helpers instead of the scalar @@ -70190,17 +74531,32 @@ struct CodeConstObjects { instance_sites: std::sync::OnceLock>, /// Verified frameless method calls per method-load site (see /// [`LeafSite`]); allocated on the first recorded one. - leaf_sites: std::sync::OnceLock>, + leaf_sites: SiteSlots, /// A leaf body's translation for the frameless evaluator (see /// [`leaf_plan`]), or `None` when the body has none. leaf_plan: std::sync::OnceLock>>, /// Whether every return is `return None` (see /// [`code_returns_only_none`]): `0` not yet decided, `1` no, `2` yes. returns_none: std::sync::atomic::AtomicU8, + /// The body's store-only `__init__` shape (see [`code_store_init`]), + /// or `None` when it isn't one. + store_init: std::sync::OnceLock>>, + /// Whether the body may call itself (see [`code_recurses`]): `0` not + /// yet decided, `1` no, `2` yes. + calls: std::sync::atomic::AtomicU8, + /// Per `co_names` entry, its position among the shared names of the + /// instances last checked for shadowing it (see [`inst_may_shadow`]). + name_memos: std::sync::OnceLock>, /// The code's name and qualified name as interned strings: a fresh /// generator's `gi_name` and `gi_qualname` while its function's names /// are untouched. gen_names: std::sync::OnceLock<(Object, Object)>, + /// `co_name`, `co_qualname` and `co_filename` as the str objects every + /// read returns (CPython stores them; logging reads two per record). + ident_strs: std::sync::OnceLock<[Object; 3]>, + /// `co_positions()` entries, as a tuple of 4-tuples, and the + /// debug-ranges setting they were built under. + positions: std::sync::OnceLock<(bool, Object)>, /// The code's native form for the core loop (see [`frame_jit`]). #[cfg(feature = "jit")] frame_jit: frame_jit::Slot, @@ -70214,6 +74570,208 @@ struct CodeConstObjects { dispatch_len: usize, } +/// [`CodeConstObjects::gen_start`]'s mark of a body with a `SEND`. +const GEN_DELEGATES: u32 = 1 << 31; + +/// The rank [`site_ranks`] gives an instruction that isn't a site (or one +/// past the 65,535th): no per-site table has an entry at it. +const NO_SITE: u16 = u16::MAX; + +/// Whether instructions of `op` are *sites*: the instructions whose pcs +/// the per-site tables of [`CodeConstObjects`] are read and written at. +/// An access at any other instruction finds no entry, as an unallocated +/// table does. +#[inline] +fn is_site_op(op: OpCode) -> bool { + matches!( + op, + OpCode::LoadGlobal + | OpCode::LoadAttr + | OpCode::LoadMethodAttr + | OpCode::LoadSuperAttr + | OpCode::StoreAttr + | OpCode::LoadSpecial + | OpCode::BinarySubscr + | OpCode::StoreSubscr + | OpCode::Call + | OpCode::CallSelf + | OpCode::CallKw + | OpCode::CallEx + ) +} + +/// Each instruction's rank among `code`'s sites (see [`is_site_op`]), in +/// order, or [`NO_SITE`]. +/// +/// The per-site tables hold an entry per site rather than per +/// instruction: most instructions (local and constant loads, stores, +/// jumps) never read one, and entries tens of bytes each for every +/// instruction made the warm code of a few imports hold megabytes of +/// tables. +fn site_ranks(code: &CodeObject) -> std::sync::Arc<[u16]> { + let mut next = 0u16; + code.instructions + .iter() + .map(|i| { + if is_site_op(i.op) && next < NO_SITE { + next += 1; + next - 1 + } else { + NO_SITE + } + }) + .collect() +} + +/// A per-site table of [`CodeConstObjects`]: an entry per site (see +/// [`site_ranks`]), allocated on first use. [`Self::get`] and +/// [`Self::view`] map an instruction's pc to its entry. +struct SiteSlots(std::sync::OnceLock>); + +/// An allocated [`SiteSlots`]: the code's site ranks (shared by its +/// tables, and kept here so that a lookup checks one initialization) and +/// the entries. +struct SiteTable { + ranks: std::sync::Arc<[u16]>, + slots: Box<[T]>, +} + +impl SiteSlots { + const fn new() -> Self { + Self(std::sync::OnceLock::new()) + } + + /// Whether the table is allocated. + #[inline] + fn is_allocated(&self) -> bool { + self.0.get().is_some() + } + + /// The entry of the instruction at `pc`, if the table is allocated + /// and the instruction is a site. + #[inline(always)] + fn get(&self, pc: usize) -> Option<&T> { + let t = self.0.get()?; + // (`NO_SITE` is past the end of every table, which has at most + // `NO_SITE` entries.) + t.slots.get(usize::from(*t.ranks.get(pc)?)) + } + + /// The pc-indexed view of the table (empty while unallocated). + #[inline(always)] + fn view(&self) -> Sites<'_, T> { + match self.0.get() { + Some(t) => Sites { + ranks: &t.ranks, + slots: &t.slots, + }, + None => Sites::empty(), + } + } +} + +/// A view of a per-site table that takes instruction pcs (see +/// [`SiteSlots`]); empty when the table isn't allocated. +pub(crate) struct Sites<'a, T> { + ranks: &'a [u16], + slots: &'a [T], +} + +impl Clone for Sites<'_, T> { + fn clone(&self) -> Self { + *self + } +} + +impl Copy for Sites<'_, T> {} + +impl<'a, T> Sites<'a, T> { + /// The view of no table. + pub(crate) const fn empty() -> Self { + Sites { + ranks: &[], + slots: &[], + } + } + + /// The entry of the instruction at `pc`, if it is a site. + #[inline(always)] + pub(crate) fn get(&self, pc: usize) -> Option<&'a T> { + // (`NO_SITE` is past the end of every table, which has at most + // `NO_SITE` entries.) + self.slots.get(usize::from(*self.ranks.get(pc)?)) + } +} + +impl CodeConstObjects { + /// The view of `table` (one of this object's per-site tables), + /// allocated (with an entry per site of `code`, this object's code) if + /// it isn't yet. + fn alloc_sites<'a, T>( + &'a self, + code: &CodeObject, + table: &'a SiteSlots, + empty: impl Fn() -> T, + ) -> Sites<'a, T> { + table.0.get_or_init(|| { + let ranks = self.site_ranks.get_or_init(|| site_ranks(code)).clone(); + let n = ranks.iter().filter(|&&r| r != NO_SITE).count(); + SiteTable { + ranks, + slots: (0..n).map(|_| empty()).collect(), + } + }); + table.view() + } + + /// The method slot of the instruction at `pc` (see + /// [`Self::method_slots`]). + #[inline(always)] + pub(crate) fn method_slot(&self, pc: usize) -> Option<&MethodSlot> { + self.method_slots.get(pc) + } + + /// The stamp slot of the instruction at `pc` (see + /// [`Self::stamp_slots`]). + #[inline(always)] + pub(crate) fn stamp_slot(&self, pc: usize) -> Option<&StampSlot> { + self.stamp_slots.get(pc) + } + + /// The field slot of the instruction at `pc` (see + /// [`Self::field_slots`]). + #[inline(always)] + pub(crate) fn field_slot(&self, pc: usize) -> Option<&FieldSlot> { + self.field_slots.get(pc) + } + + /// The polymorphic attribute entries of the instruction at `pc` (see + /// [`Self::attr_poly`]). + #[inline(always)] + pub(crate) fn attr_poly_slot(&self, pc: usize) -> Option<&AttrPoly> { + self.attr_poly.get(pc) + } + + /// The method slots by pc (see [`Self::method_slots`]). + #[inline(always)] + pub(crate) fn method_sites(&self) -> Sites<'_, MethodSlot> { + self.method_slots.view() + } + + /// The stamp slots by pc (see [`Self::stamp_slots`]). + #[inline(always)] + pub(crate) fn stamp_sites(&self) -> Sites<'_, StampSlot> { + self.stamp_slots.view() + } + + /// The field slots by pc (see [`Self::field_slots`]), allocated if + /// they aren't yet; `code` is this object's code. + #[cfg(feature = "jit")] + pub(crate) fn alloc_field_sites(&self, code: &CodeObject) -> Sites<'_, FieldSlot> { + self.alloc_sites(code, &self.field_slots, FieldSlot::empty) + } +} + /// The bound the core loop checks a code object's entry pc against, so it /// dispatches each instruction without a bounds check: the instruction /// count when no path from an instruction can leave the code, else `0` @@ -70260,10 +74818,10 @@ fn code_dispatch_len(code: &CodeObject) -> usize { } /// Whether `ext`'s code (of `ninstrs` instructions) may allocate its -/// per-instruction side tables, after one more site execution found one +/// per-site side tables, after one more site execution found one /// unallocated. /// -/// Each table holds an entry per instruction, tens of bytes each, while +/// Each table holds an entry per site, tens of bytes each, while /// most code runs only a few times (a function an import calls once or /// twice): allocating the tables at a site's first run cost a small /// program's start-up about 1.5 MB. So the tables wait until the code's @@ -70281,6 +74839,39 @@ fn site_tables_warm(ext: &CodeConstObjects, ninstrs: usize) -> bool { n as usize >= ninstrs } +/// The entry of `table` (one of `ext`'s per-site tables) for the +/// instruction at `pc`, allocating the table once `code` (`ext`'s code) is +/// warm (see [`site_tables_warm`]). +#[inline(always)] +fn warm_site<'a, T>( + ext: &'a CodeConstObjects, + code: &CodeObject, + table: &'a SiteSlots, + pc: usize, + empty: fn() -> T, +) -> Option<&'a T> { + match table.0.get() { + Some(t) => t.slots.get(usize::from(*t.ranks.get(pc)?)), + None => warm_site_alloc(ext, code, table, pc, empty), + } +} + +/// [`warm_site`] for a table not yet allocated. +#[cold] +#[inline(never)] +fn warm_site_alloc<'a, T>( + ext: &'a CodeConstObjects, + code: &CodeObject, + table: &'a SiteSlots, + pc: usize, + empty: fn() -> T, +) -> Option<&'a T> { + if !site_tables_warm(ext, code.instructions.len()) { + return None; + } + ext.alloc_sites(code, table, empty).get(pc) +} + /// Let `code`'s side tables be allocated from now on (see /// [`site_tables_warm`]): the code is hot. pub(crate) fn mark_site_tables_warm(code: &CodeObject) { @@ -70431,15 +75022,7 @@ fn builtin_recv_tag(recv: &Object) -> Option { #[inline] fn code_call_slot(code: &CodeObject, pc: usize) -> Option<&CallSlot> { let ext = code_vm_ext(code)?; - let n = code.instructions.len(); - match ext.call_slots.get() { - Some(slots) => slots, - None if site_tables_warm(ext, n) => ext - .call_slots - .get_or_init(|| (0..n).map(|_| CallSlot::empty()).collect()), - None => return None, - } - .get(pc) + warm_site(ext, code, &ext.call_slots, pc, CallSlot::empty) } /// A `LOAD_ATTR` site's polymorphic instance-attribute cache: up to @@ -70499,15 +75082,13 @@ impl AttrPoly { #[inline] fn code_attr_poly(code: &CodeObject, cache_pc: u32) -> Option<&AttrPoly> { let ext = code_vm_ext(code)?; - let n = code.instructions.len(); - match ext.attr_poly.get() { - Some(slots) => slots, - None if site_tables_warm(ext, n) => ext - .attr_poly - .get_or_init(|| (0..n).map(|_| AttrPoly::empty()).collect()), - None => return None, - } - .get(cache_pc as usize) + warm_site( + ext, + code, + &ext.attr_poly, + cache_pc as usize, + AttrPoly::empty, + ) } /// The state a `LOAD_GLOBAL` site last proved its cached slot against: @@ -70515,8 +75096,14 @@ fn code_attr_poly(code: &CodeObject, cache_pc: u32) -> Option<&AttrPoly> { /// and (for a builtin hit) the builtins dict's stamp. While all three /// match, the dicts are exactly as they were when the site last ran its /// full guards, so the cached index can be read straight away. -#[repr(transparent)] -struct StampSlot(std::cell::UnsafeCell<[u64; 3]>); +/// +/// The second field is the address of the value the core loop's +/// `LOAD_GLOBAL` arm last read under the stamp (with bit 0 set for a +/// builtin), `0` when none: a dict's stamp moves with every mutation, so +/// while the stamp holds the value stays where it is (see +/// [`Self::value`]). Every other write of the stamp clears it. +#[repr(C)] +struct StampSlot(std::cell::UnsafeCell<[u64; 3]>, std::cell::Cell); // SAFETY: as `MethodSlot`: read and written only from the dispatch loop // with the GIL held. @@ -70525,7 +75112,7 @@ unsafe impl Sync for StampSlot {} impl StampSlot { const fn empty() -> Self { - Self(std::cell::UnsafeCell::new([0; 3])) + Self(std::cell::UnsafeCell::new([0; 3]), std::cell::Cell::new(0)) } #[inline] @@ -70539,6 +75126,25 @@ impl StampSlot { // SAFETY: GIL-serialized; the exclusive reference lives only for // the assignment. unsafe { *self.0.get() = v }; + self.1.set(0); + } + + /// The value the `LOAD_GLOBAL` site last read under its stamp, as its + /// address with bit 0 set for a builtin (`0`: none). It is the value + /// while the stamp matches the frame's namespaces: the module dict's, + /// and for a builtin also the builtins dict's (stamps are unique to a + /// dict and its state). + #[inline(always)] + fn value(&self) -> u64 { + self.1.get() + } + + /// Record the value a `LOAD_GLOBAL` read under the stamp just proved + /// (see [`Self::value`]). + #[inline] + fn set_value(&self, v: &Object, builtin: bool) { + self.1 + .set(std::ptr::from_ref(v) as u64 | u64::from(builtin)); } } @@ -70548,7 +75154,10 @@ impl StampSlot { /// (see [`field_slot_note`]). The names are append-only and the version /// is process-unique, so while both match, the value at that position of /// a split instance *is* the attribute: no inline-cache decode and no -/// name comparison. +/// name comparison. A position marked [`SLOT_FIELD`] is instead a +/// `__slots__` member's in its class's slot layout (see +/// [`slot_field_note`]), which an instance laid out over that layout +/// keeps there. #[repr(transparent)] struct FieldSlot(std::cell::UnsafeCell<(u64, u32)>); @@ -70560,7 +75169,7 @@ pub(crate) const FIELD_SLOT_IDX: usize = std::mem::offset_of!((u64, u32), 1); /// The [`FieldSlot`] of the attribute site at `pc` of `code`, if the code /// has any (native code reads it in line). pub(crate) fn code_field_slot(code: &CodeObject, pc: usize) -> Option<*const u8> { - let slot = code_vm_ext(code)?.field_slots.get()?.get(pc)?; + let slot = code_vm_ext(code)?.field_slot(pc)?; Some(std::ptr::from_ref(slot).cast()) } @@ -70691,7 +75300,7 @@ fn leaf_site_hit( pc: usize, ver: u64, ) -> Option<(*const crate::object::PyFunction, *const CodeObject, bool)> { - let site = ext.leaf_sites.get()?.get(pc)?; + let site = ext.leaf_sites.get(pc)?; // SAFETY: GIL-serialized; the borrow ends before any refill. match unsafe { &*site.0.get() } { Some(d) if d.ver == ver && d.func.strong_count() > 0 => { @@ -70702,27 +75311,140 @@ fn leaf_site_hit( } } +/// The builtin method a `LOAD_ATTR` (method) site at `attr_pc` cached for +/// a `list`, `dict`, `set` or `str` receiver, with the receiver's tag (see +/// [`builtin_recv_tag`]) and the leaf kind its `CALL` at `call_pc` +/// settled on, for the frame JIT's method kernels. +#[cfg(feature = "jit")] +pub(crate) fn builtin_method_site( + ext: &CodeConstObjects, + attr_pc: usize, + call_pc: usize, +) -> Option<(u64, LeafKind, Rc)> { + let slots = ext.method_sites(); + // SAFETY: GIL-serialized; the borrow ends before any refill. + let (ver, f) = unsafe { &*slots.get(attr_pc)?.0.get() }; + let MethodSlotFn::Builtin(b) = f else { + return None; + }; + if ver & MethodSlot::BUILTIN_TAG == 0 { + return None; + } + let tag = ver & !MethodSlot::BUILTIN_TAG; + if !(1..=4).contains(&tag) { + return None; + } + let kind = slots.get(call_pc)?.get_leaf_ptr(Rc::as_ptr(b))?; + Some((tag, kind, b.clone())) +} + +/// The leaf builtin's kind the `CALL` at `pc` last settled on. +#[cfg(feature = "jit")] +pub(crate) fn call_site_leaf(ext: &CodeConstObjects, pc: usize) -> Option { + let slot = ext.method_slot(pc)?; + // SAFETY: GIL-serialized; the borrow ends here. + match unsafe { &(*slot.0.get()).1 } { + MethodSlotFn::Leaf(_, kind) => Some(*kind), + _ => None, + } +} + +/// The builtin the `CALL` at `pc` last settled on: its leaf kind, or +/// `None` and whether its body runs through `Interpreter::call` for a +/// builtin whose body the core loop's lane runs (see +/// [`MethodSlotFn::NativeBody`]). +#[cfg(feature = "jit")] +pub(crate) fn call_site_builtin( + ext: &CodeConstObjects, + pc: usize, +) -> Option<(Rc, Option, bool)> { + let slot = ext.method_slot(pc)?; + // SAFETY: GIL-serialized; the borrow ends here. + match unsafe { &(*slot.0.get()).1 } { + MethodSlotFn::Leaf(f, kind) => Some((f.clone(), Some(*kind), false)), + MethodSlotFn::NativeBody(f, via_call) => Some((f.clone(), None, *via_call)), + _ => None, + } +} + +/// The builtin type's method the method load at `pc` last resolved, and +/// the receiver variant it was resolved for (see [`builtin_recv_tag`]): +/// an exact builtin receiver's method never changes, so the variant alone +/// keys it. +#[cfg(feature = "jit")] +pub(crate) fn load_method_builtin( + ext: &CodeConstObjects, + pc: usize, +) -> Option<(u64, Rc)> { + let slot = ext.method_slot(pc)?; + // SAFETY: GIL-serialized; the borrow ends here. + match unsafe { &*slot.0.get() } { + (key, MethodSlotFn::Builtin(f)) if key & MethodSlot::BUILTIN_TAG != 0 => { + Some((key & !MethodSlot::BUILTIN_TAG, f.clone())) + } + _ => None, + } +} + +/// The builtin type the `CALL` at `pc` last constructed in place. +#[cfg(feature = "jit")] +pub(crate) fn call_site_type( + ext: &CodeConstObjects, + pc: usize, +) -> Option> { + let slot = ext.method_slot(pc)?; + // SAFETY: GIL-serialized; the borrow ends here. + match unsafe { &(*slot.0.get()).1 } { + MethodSlotFn::BuiltinType(t) => Some(t.clone()), + _ => None, + } +} + +/// Note at the `CALL` site at `pc` that its callee, a builtin type, was +/// constructed in place (see [`MethodSlot::note_builtin_type`]). +#[inline] +fn note_type_site(ext: Option<&CodeConstObjects>, pc: usize, callee: &Object) { + if let (Some(slot), Object::Type(t)) = (ext.and_then(|e| e.method_slot(pc)), callee) { + if t.flags.is_builtin && t.native_kind.get() == 0 { + slot.note_builtin_type(t); + } + } +} + +/// Whether the `CALL` at `pc` last settled on a leaf builtin the core +/// loop's arm (and the frame JIT's helper) runs in place. +#[cfg(feature = "jit")] +pub(crate) fn call_site_in_place(ext: &CodeConstObjects, pc: usize) -> bool { + call_site_leaf(ext, pc).is_some_and(LeafKind::runs_in_core) +} + /// Whether the method call whose `LOAD_ATTR` is at `pc` last resolved to /// a callee the core loop runs in place (a builtin, or a leaf function), /// without an activation of its own. #[cfg(feature = "jit")] pub(crate) fn method_site_in_place(ext: &CodeConstObjects, pc: usize) -> bool { - // SAFETY: GIL-serialized; the borrows end before any refill. + // (A recursive effect leaf runs as an ordinary call, not in place: + // `core_local_method` declines it, so a native method-call helper + // there would only cost every call its probes.) + // SAFETY: GIL-serialized; the borrows end before any refill; a live + // site's code is its live function's. let leaf = ext .leaf_sites - .get() - .and_then(|s| s.get(pc)) + .get(pc) .and_then(|s| unsafe { &*s.0.get() }.as_ref()) - .is_some_and(|site| site.func.strong_count() > 0); + .is_some_and(|site| { + site.func.strong_count() > 0 && !(site.effect && code_recurses(unsafe { &*site.code })) + }); leaf || ext - .method_slots - .get() - .and_then(|s| s.get(pc)) + .method_slot(pc) .is_some_and(|slot| match unsafe { &(*slot.0.get()).1 } { MethodSlotFn::Builtin(_) | MethodSlotFn::Leaf(..) => true, MethodSlotFn::Py(w) | MethodSlotFn::Static(w) => { // SAFETY: the function is alive while the upgrade holds it. - w.upgrade().is_some_and(|f| fn_is_leaf(&f)) + w.upgrade().is_some_and(|f| { + fn_is_pure_leaf(&f) + || (fn_is_leaf(&f) && !code_recurses(unsafe { &*f.code.as_ptr() })) + }) } _ => false, }) @@ -70730,13 +75452,13 @@ pub(crate) fn method_site_in_place(ext: &CodeConstObjects, pc: usize) -> bool { /// Record (or, with `data` `None`, forget) the site at `pc`'s callee. #[inline(never)] -fn leaf_site_set(ext: &CodeConstObjects, ninstrs: usize, pc: usize, data: Option) { - if ext.leaf_sites.get().is_none() && (data.is_none() || !site_tables_warm(ext, ninstrs)) { +fn leaf_site_set(ext: &CodeConstObjects, code: &CodeObject, pc: usize, data: Option) { + if !ext.leaf_sites.is_allocated() + && (data.is_none() || !site_tables_warm(ext, code.instructions.len())) + { return; } - let sites = ext - .leaf_sites - .get_or_init(|| (0..ninstrs).map(|_| LeafSite::empty()).collect()); + let sites = ext.alloc_sites(code, &ext.leaf_sites, LeafSite::empty); if let Some(site) = sites.get(pc) { site.set(data); } @@ -70755,7 +75477,8 @@ enum SiteCall { } /// The attribute `inst` holds for the `LOAD_ATTR` at `pc`, through the -/// site's [`FieldSlot`] (never recorded for a slot or native class). +/// site's [`FieldSlot`]: a split field, or a laid-out `__slots__` member +/// (never recorded for a native class). /// /// # Safety /// @@ -70767,30 +75490,105 @@ unsafe fn field_slot_hit<'a>( pc: usize, inst: &'a PyInstance, ) -> Option<&'a Object> { - let (ver, idx) = ext.field_slots.get()?.get(pc)?.get(); + let (ver, idx) = ext.field_slot(pc)?.get(); if inst.cls_raw().attr_version.get() != ver { return None; } + if idx & SLOT_FIELD != 0 { + // SAFETY: forwarded contract. + return unsafe { inst.laid_out_slot((idx & !SLOT_FIELD) as usize) }; + } // SAFETY: forwarded contract. unsafe { inst.split_field(idx as usize) } } +/// Count a frameless slot read by the shape of the leaf `code` reading it +/// (the unit tests' path coverage). +#[cfg(test)] +fn note_pure_slot_field_read(code: &CodeObject) { + PURE_SLOT_FIELD_READS.with(|hits| { + let mut counts = hits.get(); + let shape = + code_vm_ext(code).map(|ext| ext.pure_leaf.load(std::sync::atomic::Ordering::Relaxed)); + let index = match shape { + Some(6) => 0, + Some(7) => 1, + _ => 2, + }; + counts[index] += 1; + hits.set(counts); + }); +} + +/// A [`FieldSlot`] position naming a `__slots__` member's place in its +/// class's slot layout (see [`crate::types::PyInstance::laid_out_slot`]) +/// rather than a split field's: CPython's member descriptor offset. No +/// split position reaches it (a class shares at most +/// [`crate::inst_dict::SHARED_KEYS_CAP`] names). +pub(crate) const SLOT_FIELD: u32 = 1 << 31; + +/// Record the [`FieldSlot`] shortcut for the attribute site at `pc` of +/// `code` (name `co_names[name_idx]`) to the `__slots__` member at +/// position `idx` of `inst`'s slots, after the site's guarded read or +/// store of a member (the class passed the site's version check): kept +/// only when the instance's slots are laid out over its class's own +/// layout with the name there, where the position names the member for +/// as long as the class lives. +#[inline(never)] +fn slot_field_note( + code: &CodeObject, + ext: &CodeConstObjects, + pc: usize, + inst: &PyInstance, + idx: u32, + name_idx: u32, +) { + let ninstrs = code.instructions.len(); + let cls = inst.cls_raw(); + let Some(layout) = cls.slot_layout.get().and_then(Option::as_ref) else { + return; + }; + match layout.get(idx as usize) { + Some(key) if slot_name_matches_in(&ext.name_objs, code, name_idx, key) => {} + _ => return, + } + // SAFETY: a read with nothing running (the caller's own guarded + // access, whose borrow has ended). + if unsafe { inst.slots.peek() } + .and_then(|s| s.values_for_layout(layout)) + .is_none() + { + return; + } + if !ext.field_slots.is_allocated() && !site_tables_warm(ext, ninstrs) { + return; + } + let slots = ext.alloc_sites(code, &ext.field_slots, FieldSlot::empty); + if let Some(slot) = slots.get(pc) { + slot.set((cls.attr_version.get(), idx | SLOT_FIELD)); + } +} + /// Record the [`FieldSlot`] shortcut for the `LOAD_ATTR` at `pc`, after /// a guarded read found its name at dictionary position `idx` of `inst` /// (whose class passed the site's version check): kept only when that /// position is the split layout's, over the class's own names. #[inline(never)] -fn field_slot_note(ext: &CodeConstObjects, ninstrs: usize, pc: usize, inst: &PyInstance, idx: u32) { +fn field_slot_note( + ext: &CodeConstObjects, + code: &CodeObject, + pc: usize, + inst: &PyInstance, + idx: u32, +) { // SAFETY: a read with nothing running (the caller's own guarded read). if unsafe { inst.split_field(idx as usize) }.is_none() { return; } - if ext.field_slots.get().is_none() && !site_tables_warm(ext, ninstrs) { + if !ext.field_slots.is_allocated() && !site_tables_warm(ext, code.instructions.len()) { return; } - let slots = ext - .field_slots - .get_or_init(|| (0..ninstrs).map(|_| FieldSlot::empty()).collect()); + let slots = ext.alloc_sites(code, &ext.field_slots, FieldSlot::empty); if let Some(slot) = slots.get(pc) { slot.set((inst.cls_raw().attr_version.get(), idx)); } @@ -70818,10 +75616,7 @@ fn native_site_note(ext: &CodeConstObjects, ninstrs: usize, pc: usize) { /// Whether the `LOAD_ATTR` at `pc` has recorded a split-layout field (see /// [`FieldSlot`]). pub(crate) fn field_site(ext: &CodeConstObjects, pc: usize) -> bool { - ext.field_slots - .get() - .and_then(|s| s.get(pc)) - .is_some_and(|s| s.get().0 != 0) + ext.field_slot(pc).is_some_and(|s| s.get().0 != 0) } /// Whether the operator at `pc` has run on a natively served operand. @@ -70842,10 +75637,7 @@ fn instance_site_note(ext: &CodeConstObjects, ninstrs: usize, pc: usize) { /// method slot holds one). #[cfg(feature = "jit")] pub(crate) fn property_site(ext: &CodeConstObjects, pc: usize) -> bool { - ext.method_slots - .get() - .and_then(|s| s.get(pc)) - .is_some_and(MethodSlot::holds_getter) + ext.method_slot(pc).is_some_and(MethodSlot::holds_getter) } /// Whether the `BINARY_OP` at `pc` has run on an instance operand. @@ -70863,18 +75655,12 @@ pub(crate) fn native_site(ext: &CodeConstObjects, pc: usize) -> bool { .is_some_and(|s| s.load(std::sync::atomic::Ordering::Relaxed)) } -/// The bytes compiled code tests before releasing a shared value in line: +/// The word compiled code tests before releasing a shared value in line: /// the reference-count bias's shared flag and every observer -/// [`Interpreter::core_drops_plain`] consults; all zero for a plain -/// decrement. -pub(crate) fn plain_release_flags() -> [*const u8; 4] { - let [dicts, funcs] = crate::capi_watchers::release_flags(); - [ - crate::sync::rc_shared_flag().as_ptr().cast_const().cast(), - dicts, - funcs, - crate::stdlib::testinternalcapi_mod::reftrace_print_flag(), - ] +/// [`Interpreter::core_drops_plain`] consults, one byte each; zero for a +/// plain decrement. +pub(crate) fn plain_release_gate() -> *const u32 { + std::ptr::from_ref(&crate::sync::RELEASE_GATES).cast() } /// `v.clone()`, in line (see `Object`'s `Clone`). @@ -70893,8 +75679,15 @@ fn scalar_copy(v: &Object) -> Object { v, Object::None | Object::Unbound | Object::Bool(_) | Object::Int(_) | Object::Float(_) )); - // SAFETY: a scalar owns nothing: its bits are a complete copy. - unsafe { std::ptr::read(v) } + // SAFETY: a scalar owns nothing: its bits are a complete copy. (Read + // as opaque bytes: typed as an `Object` known to be a scalar, the copy + // is split into the variants' fields, a byte, a word and padding moved + // apart through the stack.) + unsafe { + std::mem::transmute::, Object>(std::ptr::read( + std::ptr::from_ref(v).cast::>(), + )) + } } /// `Object::Int(v)` built as two whole words (see [`clone_hot`]): the @@ -70950,19 +75743,63 @@ fn drop_hot(v: Object) { } } +/// Whether a shared value's reference may be released by a plain +/// decrement: one thread owns every count and no observer wants releases +/// (one load of [`plain_release_gate`]'s flags; a debug build's counts are +/// always atomic, as [`crate::rc::try_release_word`]'s are). +#[inline(always)] +fn release_gates_clear() -> bool { + // SAFETY: the gates are four flags laid out as one `u32`. + !cfg!(debug_assertions) + && unsafe { + (*plain_release_gate().cast::()) + .load(std::sync::atomic::Ordering::Relaxed) + == 0 + } +} + +/// Release the `n` call operands at `p` (moved out: the caller's stack no +/// longer counts them) in order, as [`Interpreter::release`] does, with +/// the commonest cases in line: a scalar, or a shared value's plain +/// decrement while [`release_gates_clear`] holds. A last owner, or any +/// release an observer wants, takes the full release. +/// +/// # Safety +/// +/// `p` holds `n` initialized values the caller owns and gives up. +#[inline(always)] +unsafe fn release_operands(interp: &Interpreter, p: *const Object, n: usize) { + let plain = release_gates_clear(); + for k in 0..n { + // SAFETY: the caller's contract: each value owns a reference to its + // live allocation, which (with the gates clear) only this thread + // counts; the value is read out only for the full release. + unsafe { + let at = p.add(k); + let Some(word) = (*at).strong_word() else { + continue; + }; + let c = (*word).load(std::sync::atomic::Ordering::Relaxed); + if plain && c > 1 { + (*word).store(c - 1, std::sync::atomic::Ordering::Relaxed); + } else { + interp.release(at.read()); + } + } + } +} + /// The stamp slot for `cache_pc`, allocating the table on first use. #[inline] fn code_stamp_slot(code: &CodeObject, cache_pc: u32) -> Option<&StampSlot> { let ext = code_vm_ext(code)?; - let n = code.instructions.len(); - match ext.stamp_slots.get() { - Some(slots) => slots, - None if site_tables_warm(ext, n) => ext - .stamp_slots - .get_or_init(|| (0..n).map(|_| StampSlot::empty()).collect()), - None => return None, - } - .get(cache_pc as usize) + warm_site( + ext, + code, + &ext.stamp_slots, + cache_pc as usize, + StampSlot::empty, + ) } /// Tags of a `LOAD_ATTR` site's class-attribute stamp (`[attr_version, @@ -70995,6 +75832,80 @@ const TUPLE_FIELD: u64 = 0x5ca1_a770_0000_0005; /// data descriptor, so no instance dictionary shadows it. const LAID_OUT_SLOT: u64 = 0x5ca1_a770_0000_0006; +/// A `DELETE_ATTR` site's stamp tag: the class at that version deletes the +/// site's name from an instance's own dictionary by the default +/// `__delattr__`, with no class attribute of that name in the way (see +/// [`Interpreter::core_delete_attr`]). +const DELETE_OWN_ATTR: u64 = 0x5ca1_a770_0000_0007; + +/// Whether the `LOAD_ATTR` at `pc` is cooling down after a failed load +/// (an odd count; see `Interpreter::specialized_load_attr`'s `Cooldown` +/// arm): its lanes are skipped for the full handler, whose certainly +/// missing check raises (`try: o.x except AttributeError:`). +#[inline(always)] +pub(crate) fn failing_attr_site(code: &CodeObject, pc: usize) -> bool { + matches!( + code.caches.get(pc as u32), + weavepy_compiler::InlineCache::Cooldown(n) if n & 1 == 1 + ) +} + +/// A `LOAD_ATTR` site's stamp tag for a module attribute: the first word +/// is the module dict's mutation stamp, the bits the entry's position. +/// A stamp names one key layout of one dict (values stored in place keep +/// it), so while it matches, that position holds the site's name. +const MODULE_ENTRY: u64 = 0x5ca1_a770_0000_0008; + +/// A `LOAD_ATTR` site's stamp tag for `inst.__dict__` where the class (at +/// that version) resolves the name to its own `__dict__` member, a data +/// descriptor serving the instance dict (CPython's `subtype_dict`). +const INST_DICT: u64 = 0x5ca1_a770_0000_0009; + +/// `inst.__dict__` for the `LOAD_ATTR` site at `pc` (name `name_idx`): +/// through the site's [`INST_DICT`] stamp, or, for a class that resolves +/// `__dict__` to its plain dict member under the default attribute +/// protocol, the instance dict, after which the site remembers the class. +/// `None` for any other name or shape. Runs no code (the dict may be +/// created). +#[inline(always)] +fn inst_dict_attr( + code: &CodeObject, + inst: &PyInstance, + pc: usize, + name_idx: u32, +) -> Option { + if code.names.get(name_idx as usize)?.as_str() != "__dict__" { + return None; + } + inst_dict_attr_named(code, inst, pc) +} + +/// [`inst_dict_attr`] once the name is `__dict__`. +#[inline(never)] +fn inst_dict_attr_named(code: &CodeObject, inst: &PyInstance, pc: usize) -> Option { + if inst.native.get().is_some() || inst.c_body.get() != 0 { + return None; + } + let cls = inst.cls_raw(); + let ver = cls.attr_version.get(); + let warm = code_vm_ext(code) + .and_then(|ext| ext.stamp_slot(pc)) + .is_some_and(|slot| slot.get()[..2] == [ver, INST_DICT]); + if !warm { + if !cls.has_managed_dict() + || cls.native_kind.get() != 0 + || cls.c_ext_ptr.get() != 0 + || !Interpreter::default_getattribute(cls) + || cls.is_super_proxy_type() + || !matches!(cls.lookup("__dict__"), Some(Object::SlotDescriptor(s)) if s.name == "__dict__") + { + return None; + } + code_stamp_slot(code, pc as u32)?.set([ver, INST_DICT, 0]); + } + Some(Object::Dict(inst.dict_shared())) +} + /// The named tuple field a `LOAD_ATTR` site's stamp remembers for /// `inst`'s class at its current version (see [`TUPLE_FIELD`]): the item /// of `inst`'s tuple, or `None` (an index out of range is the @@ -71109,6 +76020,10 @@ enum MethodSlotFn { generation: u64, fast: leaf_builtins::Fast, }, + /// A `CALL` site's builtin type (`type(x)`, `int(s)`, `list()`), which + /// the site constructed in place (see `Interpreter::core_builtin_ctor`). + /// Builtin types live as long as the interpreter. + BuiltinType(Rc), /// A rejected native bound-call body, weakly held so a call site /// doesn't extend its lifetime. The key is the registry generation. NonLeaf(crate::sync::Weak), @@ -71444,6 +76359,22 @@ impl MethodSlot { unsafe { *self.0.get() = (0, MethodSlotFn::NativeBody(f.clone(), via_call)) }; } + /// Remember that this `CALL` site constructed the builtin type `t` in + /// place, unless the site already settled on another callee. + #[inline] + fn note_builtin_type(&self, t: &Rc) { + // SAFETY: as `get`; the shared borrow ends before the write. + let vacant = match unsafe { &*self.0.get() } { + (_, MethodSlotFn::BuiltinType(c)) => !Rc::ptr_eq(c, t), + (0, MethodSlotFn::Py(w)) => w.strong_count() == 0, + _ => false, + }; + if vacant { + // SAFETY: as `set`. + unsafe { *self.0.get() = (0, MethodSlotFn::BuiltinType(t.clone())) }; + } + } + fn is_non_leaf(&self, method: &Rc) -> bool { // SAFETY: GIL-held leaf dispatch, as `get_leaf`. A live Weak keeps // the allocation reserved, preventing address-reuse aliasing. @@ -71600,15 +76531,13 @@ impl MethodSlot { #[inline] fn code_method_slot(code: &CodeObject, cache_pc: u32) -> Option<&MethodSlot> { let ext = code_vm_ext(code)?; - let n = code.instructions.len(); - match ext.method_slots.get() { - Some(slots) => slots, - None if site_tables_warm(ext, n) => ext - .method_slots - .get_or_init(|| (0..n).map(|_| MethodSlot::empty()).collect()), - None => return None, - } - .get(cache_pc as usize) + warm_site( + ext, + code, + &ext.method_slots, + cache_pc as usize, + MethodSlot::empty, + ) } /// The plain function class `cls` (at attribute version `ver`) resolves @@ -71653,16 +76582,15 @@ pub(crate) fn code_is_pure_leaf_pub(code: &CodeObject) -> bool { } /// The fused-pair kind of every instruction (see -/// [`CodeConstObjects::fast_pairs`]), built once per code object. -/// Empty for code with no pair at all — the common shape, whose -/// `LOAD_FAST` arm then reads nothing. +/// [`CodeConstObjects::fast_pairs`]), built once per code object: past +/// the local-to-local pairs, the receiver-fused kinds ([`FAST_METHOD`] and +/// on), which `LOAD_FAST` reads instead of decoding the next instruction. +/// Empty for code with none at all, whose `LOAD_FAST` arm then reads +/// nothing. fn code_fast_pairs<'a>(code: &CodeObject, ext: Option<&'a CodeConstObjects>) -> &'a [u8] { let Some(ext) = ext else { return &[] }; ext.fast_pairs.get_or_init(|| { - // (`WEAVEPY_NO_PAIRS`, a bisection aid, leaves every table empty.) - if crate::hot_gates::env_flags::no_pairs() { - return Box::new([]); - } + let no_pairs = crate::hot_gates::env_flags::no_pairs(); let ops = &code.instructions; let mut any = false; let mut kinds = vec![0u8; ops.len()]; @@ -71671,6 +76599,19 @@ fn code_fast_pairs<'a>(code: &CodeObject, ext: Option<&'a CodeConstObjects>) -> continue; } let kind = match ops.get(pc + 1).map(|i| i.op) { + // The receiver-fused shapes: a method call, an attribute + // read (a chain of them) or store on the local. + Some(OpCode::LoadMethodAttr) => FAST_METHOD, + Some(OpCode::LoadAttr) + if ops.get(pc + 2).map(|i| i.op) == Some(OpCode::LoadAttr) => + { + FAST_ATTR_CHAIN + } + Some(OpCode::LoadAttr) => FAST_ATTR, + Some(OpCode::StoreAttr) => FAST_STORE_ATTR, + // (`WEAVEPY_NO_PAIRS`, a bisection aid, leaves out the + // local-to-local pairs.) + _ if no_pairs => 0, // A second load whose own successor reads an attribute // off it keeps the receiver-fused arm instead. Some(OpCode::LoadFast) => u8::from(!matches!( @@ -71702,6 +76643,14 @@ fn code_fast_pairs<'a>(code: &CodeObject, ext: Option<&'a CodeConstObjects>) -> }) } +/// [`code_fast_pairs`]'s receiver-fused kinds: the `LOAD_FAST` is followed +/// by a `LOAD_METHOD_ATTR`, a `LOAD_ATTR` (followed by another, for the +/// chain), or a `STORE_ATTR`. +const FAST_METHOD: u8 = 5; +const FAST_ATTR: u8 = 6; +const FAST_ATTR_CHAIN: u8 = 7; +const FAST_STORE_ATTR: u8 = 8; + /// A leaf's parameter count: its positional parameters, its keyword-only /// ones, then its `**kwargs` dictionary when it has one (bound by keyword /// calls only; a leaf has no `*args`). @@ -71994,6 +76943,132 @@ fn code_returns_only_none(code: &CodeObject) -> bool { yes } +/// Whether `code`'s body may call itself: it makes a call, and its names +/// include its own (`self.find(...)` in a method `find`, or a recursive +/// function's global). Cached in its extension. Evaluated frameless, a +/// recursive effect leaf nests its own evaluation at every level, which +/// costs more than calling it directly (go's `Square.find`); an effect +/// leaf that calls other code costs less frameless (deltablue's +/// constraint methods, whose direct calls compiled them to no gain). +fn code_recurses(code: &CodeObject) -> bool { + use std::sync::atomic::Ordering::Relaxed; + let Some(ext) = code_vm_ext(code) else { + return true; + }; + match ext.calls.load(Relaxed) { + 1 => return false, + 2 => return true, + _ => {} + } + let yes = code.names.contains(&code.name) + && code + .instructions + .iter() + .any(|i| matches!(i.op, OpCode::Call | OpCode::CallKw | OpCode::CallEx)); + ext.calls.store(if yes { 2 } else { 1 }, Relaxed); + yes +} + +/// Where a store-only `__init__`'s stored value comes from. +#[derive(Clone, Copy)] +enum StoreSrc { + /// The parameter at this position (`0` is the instance itself). + Param(u32), + /// This constant (an index into the code's constant objects). + Const(u32), + /// A small int literal. + Int(i64), +} + +/// A *store-only* `__init__` (see [`code_store_init`]): its attribute +/// stores into `self`, in order. +struct StoreInit { + /// Each store's `STORE_ATTR` pc and the value it stores. + stores: Box<[(u32, StoreSrc)]>, + /// How many stores take each parameter (a parameter's last use moves + /// it, any earlier one copies it). + uses: Box<[u8]>, +} + +/// The store-only shape of `code`: a body that is nothing but +/// `self.name = ` statements followed by +/// `return None` (`RESUME` aside), as most `__init__`s are. Cached in the +/// code's extension. +fn code_store_init(code: &CodeObject) -> Option<&StoreInit> { + let ext = code_vm_ext(code)?; + ext.store_init + .get_or_init(|| store_init_shape(code).map(Box::new)) + .as_deref() +} + +fn store_init_shape(code: &CodeObject) -> Option { + let nparams = code.arg_count as usize; + if nparams == 0 + || nparams > 8 + || code.is_generator + || code.is_coroutine + || code.is_async_generator + || !code.cellvars.is_empty() + || !code.freevars.is_empty() + || Interpreter::has_extended_params(code) + { + return None; + } + let ins = &code.instructions; + let mut stores = Vec::new(); + let mut uses = vec![0u8; nparams]; + let mut pc = 0; + while pc < ins.len() { + let i = ins[pc]; + match i.op { + OpCode::Resume | OpCode::Nop | OpCode::NotTaken => pc += 1, + OpCode::LoadConst + if matches!(code.constants.get(i.arg as usize), Some(Constant::None)) + && ins.get(pc + 1).is_some_and(|n| n.op == OpCode::ReturnValue) => + { + // The final `return None`: the shape holds when nothing + // else follows it. + if pc + 2 != ins.len() + || stores.is_empty() + || stores.len() > crate::inst_dict::SHARED_KEYS_CAP + { + return None; + } + return Some(StoreInit { + stores: stores.into_boxed_slice(), + uses: uses.into_boxed_slice(), + }); + } + _ => { + let src = match i.op { + OpCode::LoadFast | OpCode::LoadFastBorrow | OpCode::LoadFastCheck + if (i.arg as usize) < nparams => + { + uses[i.arg as usize] = uses[i.arg as usize].checked_add(1)?; + StoreSrc::Param(i.arg) + } + OpCode::LoadConst => StoreSrc::Const(i.arg), + OpCode::LoadSmallInt => StoreSrc::Int(i64::from(i.arg)), + _ => return None, + }; + let recv = ins.get(pc + 1)?; + let store = ins.get(pc + 2)?; + if !matches!( + recv.op, + OpCode::LoadFast | OpCode::LoadFastBorrow | OpCode::LoadFastCheck + ) || recv.arg != 0 + || store.op != OpCode::StoreAttr + { + return None; + } + stores.push((u32::try_from(pc + 2).ok()?, src)); + pc += 3; + } + } + } + None +} + /// Whether `code` is an *effect leaf* (see `code_pure_leaf_decide`), /// deciding its leaf verdicts on first use. #[inline] @@ -72112,7 +77187,7 @@ pub(crate) fn code_gen_names(code: &CodeObject) -> (Object, Object) { /// outlives its young set, so a long-lived one (a parked coroutine, say) /// holds no more than it needs. pub(crate) fn compact_generator_frame(gen: &PyGenerator) { - let Ok(mut state) = gen.state.try_borrow_mut() else { + let Ok(mut state) = gen.state().try_borrow_mut() else { return; }; let (GeneratorState::Created(frame) | GeneratorState::Suspended(frame)) = &mut *state else { @@ -72179,21 +77254,28 @@ fn code_vm_ext_build(code: &CodeObject) -> &CodeConstObjects { .iter() .map(|n| crate::stdlib::sys::intern_name(n)) .collect(), - method_slots: std::sync::OnceLock::new(), - stamp_slots: std::sync::OnceLock::new(), - attr_poly: std::sync::OnceLock::new(), - call_slots: std::sync::OnceLock::new(), + site_ranks: std::sync::OnceLock::new(), + method_slots: SiteSlots::new(), + stamp_slots: SiteSlots::new(), + attr_poly: SiteSlots::new(), + call_slots: SiteSlots::new(), pure_leaf: std::sync::atomic::AtomicU8::new(0), leaf_tries: std::sync::atomic::AtomicU64::new(0), fast_pairs: std::sync::OnceLock::new(), gen_fast: std::sync::atomic::AtomicU8::new(0), - field_slots: std::sync::OnceLock::new(), + gen_start: std::sync::atomic::AtomicU32::new(0), + field_slots: SiteSlots::new(), native_sites: std::sync::OnceLock::new(), instance_sites: std::sync::OnceLock::new(), - leaf_sites: std::sync::OnceLock::new(), + leaf_sites: SiteSlots::new(), leaf_plan: std::sync::OnceLock::new(), returns_none: std::sync::atomic::AtomicU8::new(0), + store_init: std::sync::OnceLock::new(), + calls: std::sync::atomic::AtomicU8::new(0), + name_memos: std::sync::OnceLock::new(), gen_names: std::sync::OnceLock::new(), + ident_strs: std::sync::OnceLock::new(), + positions: std::sync::OnceLock::new(), #[cfg(feature = "jit")] frame_jit: frame_jit::Slot::default(), cold_sites: std::sync::atomic::AtomicU32::new(0), @@ -72308,7 +77390,7 @@ fn set_function_attribute(func: Object, value: Object, flag: u32) -> Result Some(v.clone()), + _ => g.get(&DictKey(fn_slot_keys()[1].clone())).cloned(), + } + }; let f = PyFunction { name: code.name.clone(), code: RefCell::new(code), @@ -72425,8 +77511,10 @@ fn new_function( attrs: RefCell::new(None), slots_raw: crate::sync::OnceBox::new(), slot_seed: RefCell::new(Some(crate::object::LazySlots(module))), + gc_slot: crate::gc_trace::GcSlot::new(), closure_cells: std::sync::OnceLock::new(), defaults_override: crate::object::OverrideFlag::new(false), + names_kept: crate::sync::Cell::new(0), }; if let Some(ann) = annotations { f.slots() @@ -72542,9 +77630,18 @@ fn inst_may_shadow(inst: &PyInstance, code: &CodeObject, name_idx: u32) -> bool return false; } let i = name_idx as usize; - match code_vm_ext(code).map(|t| (t.name_objs.get(i), t.name_hashes.get(i))) { + let ext = code_vm_ext(code); + match ext.map(|t| (t.name_objs.get(i), t.name_hashes.get(i))) { Some((Some(Object::Str(n)), Some(&hash))) => { - split.position_hashed(n, hash).is_some() + let memos = ext.expect("matched above").name_memos.get_or_init(|| { + (0..code.names.len()) + .map(|_| crate::inst_dict::NameMemo::default()) + .collect() + }); + match memos.get(i) { + Some(memo) => split.holds_memo(n, hash, memo), + None => split.position_hashed(n, hash).is_some(), + } } _ => code_name_key(code, name_idx) .is_none_or(|k| split.position_hashed(k.s, k.hash).is_some()), @@ -75233,6 +80330,7 @@ next(gen) #[test] fn sum_streaming_integer_fastpath_preserves_boundaries_and_fallbacks() { + let _gil = crate::gil::hold_gil(); let zero = Object::Int(0); for sequence in [ Object::new_list(vec![Object::Int(i64::MAX), Object::Int(1), Object::Int(-1)]), @@ -75260,6 +80358,11 @@ next(gen) fn run(src: &str) -> String { let module = parse_module(src).expect("parse"); + // Tests run in parallel, each with its own interpreter, and share + // the process-wide collector: hold the GIL while this thread's + // objects are built, read and released (it still passes the GIL + // on at the eval loop's hand-off points). + let _gil = crate::gil::hold_gil(); let code = compile_module(&module).expect("compile"); let mut interp = Interpreter::new(); let buf: Rc>> = Rc::new(RefCell::new(Vec::new())); @@ -75475,6 +80578,7 @@ assert loop(2000) == 1999000 std::thread::Builder::new() .stack_size(8 * 1024 * 1024) .spawn(|| { + let _gil = crate::gil::hold_gil(); crate::tier2::force_enable_for_test(4); crate::tier2::note_startup_finished(); let mut interp = Interpreter::new(); @@ -75960,7 +81064,7 @@ assert loop(2000) == 1999000 " function owners={}, maybe_tracked={}, tracked={}", Rc::strong_count(function), gc_trace::maybe_tracked(id), - gc_trace::is_tracked(id) + gc_trace::is_tracked(&Object::Function(function.clone())) ); if *name == "default_predicate" { if let Some(receiver @ Object::Instance(inst)) = function.defaults.first() { @@ -77176,7 +82280,31 @@ assert loop(2000) == 1999000 .expect("jit worker thread") } + /// Run `body` for the test `name` (its path in the test binary) in a + /// child process of its own: `sys.setrecursionlimit` sets a + /// process-wide limit, which a test must not change under the + /// interpreters the other tests run on concurrent threads (or have + /// changed under it). + #[cfg(feature = "jit")] + fn with_own_recursion_limit(name: &str, body: impl FnOnce()) { + const CHILD: &str = "WEAVEPY_RECURSION_LIMIT_TEST_CHILD"; + if std::env::var_os(CHILD).is_some() { + body(); + return; + } + let status = std::process::Command::new(std::env::current_exe().expect("test executable")) + .args(["--exact", name, "--nocapture"]) + .env(CHILD, "1") + .status() + .expect("spawn recursion-limit test"); + assert!( + status.success(), + "isolated recursion-limit test failed: {status}" + ); + } + fn check_cold_instance_dictionaries() { + let _gil = crate::gil::hold_gil(); let source = r" import gc class Plain: @@ -77261,6 +82389,49 @@ assert namespace is exported.__dict__ .expect("jit worker thread"); } + /// Building and dropping an interpreter waits for the GIL. Both + /// touch objects of the process-wide collector -- construction tracks + /// thousands, and the drop releases them -- and a collection on another + /// thread reads every tracked object, and the collector's own lists, + /// without taking cell borrows. The parallel unit tests, each with its + /// own interpreter, corrupted the collector's deferred list and freed + /// lists under a collection's mark walk while they did either outside + /// the GIL. + #[test] + fn interpreters_build_and_drop_under_the_gil() { + use std::sync::atomic::{AtomicBool, Ordering}; + use std::sync::Arc; + // Hold the GIL for a while and check that `work`, on another + // thread, did not finish meanwhile. + fn waits_for_the_gil(work: impl FnOnce() + Send + 'static) { + let done = Arc::new(AtomicBool::new(false)); + let gil = crate::gil::hold_gil(); + let worker = { + let done = done.clone(); + std::thread::spawn(move || { + work(); + done.store(true, Ordering::Release); + }) + }; + std::thread::sleep(std::time::Duration::from_millis(300)); + assert!( + !done.load(Ordering::Acquire), + "the interpreter was built or dropped without the GIL" + ); + drop(gil); + worker.join().expect("interpreter thread"); + assert!(done.load(Ordering::Acquire)); + } + // Warm the process-wide caches, so the timed construction is fast. + drop(Interpreter::new()); + waits_for_the_gil(|| drop(Interpreter::new())); + let mut interp = Interpreter::new(); + let module = parse_module("data = {i: [i] for i in range(100)}\n").expect("parse"); + let code = compile_module(&module).expect("compile"); + interp.run_module(&code).expect("run"); + waits_for_the_gil(move || drop(interp)); + } + #[test] fn runs_print_int() { assert_eq!(run("print(42)\n"), "42\n"); @@ -80586,6 +85757,14 @@ assert namespace is exported.__dict__ sys.setrecursionlimit(limit)\n\ print('depth', depth)\n\ print(run(c, 3000, rebind, 1000))\n"; + with_own_recursion_limit( + "tests::jit_direct_method_call_guard_changes_match_interpreter", + || check_direct_method_call_guard_changes(src), + ); + } + + #[cfg(feature = "jit")] + fn check_direct_method_call_guard_changes(src: &str) { let (out, compiled, _deopts) = run_jit(src); assert!(compiled >= 2, "the method kernels never compiled"); assert_eq!(out, run(src)); @@ -81947,10 +87126,15 @@ print("native pickle coverage: ok") \x20 return down(n - 1)\n\ k = 0\nwhile k < 10:\n down(5)\n k = k + 1\n\ try:\n down(100000)\nexcept RecursionError:\n print('rec ok')\n"; - let (out, calls, _fallbacks, _deopts) = run_jit_native(src); - assert!(calls >= 1, "down never took the native call path"); - assert_eq!(out, "rec ok\n"); - assert_eq!(out, run(src)); + with_own_recursion_limit( + "tests::jit_native_recursion_limit_matches_interpreter", + || { + let (out, calls, _fallbacks, _deopts) = run_jit_native(src); + assert!(calls >= 1, "down never took the native call path"); + assert_eq!(out, "rec ok\n"); + assert_eq!(out, run(src)); + }, + ); } #[cfg(feature = "jit")] @@ -82406,6 +87590,7 @@ print("native pickle coverage: ok") #[test] fn native_leaf_lookup_uses_body_identity() { + let _gil = crate::gil::hold_gil(); let interp = Interpreter::new(); let receiver = Object::new_list(Vec::new()); let Object::Builtin(first) = interp.lookup_method(&receiver, "__len__").unwrap() else { @@ -82427,6 +87612,7 @@ print("native pickle coverage: ok") #[test] fn native_bound_rejection_cache_does_not_own_methods() { + let _gil = crate::gil::hold_gil(); let receiver = Rc::new(RefCell::new(Vec::new())); let weak_receiver = Rc::downgrade(&receiver); let object = Object::List(receiver); diff --git a/crates/weavepy-vm/src/object.rs b/crates/weavepy-vm/src/object.rs index feff05d4..65f269a5 100644 --- a/crates/weavepy-vm/src/object.rs +++ b/crates/weavepy-vm/src/object.rs @@ -225,9 +225,8 @@ pub enum Object { Bytes(SharedSlice), /// Mutable byte string `bytearray(...)`. ByteArray(Rc>>), - /// Mutable set `{1, 2, 3}` / `set(...)`. Backed by an - /// `IndexSet` so iteration order is insertion order - /// (CPython 3.7+ semantics). + /// Mutable set `{1, 2, 3}` / `set(...)`. Backed by a + /// [`crate::dictmap::SetMap`], a compact hash table of its keys. Set(Rc>), /// Immutable set `frozenset(...)`. Wrapped in [`FrozenSetObj`] so the /// CPython `so_hash` cache (frozensets are immutable, so their hash is @@ -458,10 +457,20 @@ pub struct PyFrame { pub code: Rc, pub globals: Rc>, pub builtins: Rc>, - /// Index of the current instruction inside [`Self::code`]. Updated - /// per-instruction by the dispatch loop while this frame is the - /// active one. + /// Index of the current instruction inside [`Self::code`]. While the + /// activation is live its shell's mirror is the current one (see + /// [`Self::live`]): read through [`Self::lasti_now`] and write through + /// [`Self::set_lasti`]. pub lasti: Cell, + /// The spine shell of this frame's activation while it is live, null + /// otherwise. The dispatch loops keep the shell's `lasti` current at + /// every point where code may look at the frame (each call, each + /// out-of-line attribute load, each hand-back to the general loop), + /// so a frame object reads it from there instead of making its + /// activation sync the object instruction by instruction. Set when + /// the shell takes the object, cleared when the shell leaves the + /// spine or dies. + pub(crate) live: std::sync::atomic::AtomicPtr, /// The enclosing frame (the next-outer in the call stack), `None` /// for the module frame. pub back: RefCell>>, @@ -639,10 +648,50 @@ impl PyFrame { if let Some(v) = self.override_lineno.get() { return v; } - let pc = self.lasti.get() as usize; + let pc = self.lasti_now() as usize; self.code.linetable.get(pc).copied().unwrap_or(0) } + /// The current instruction index: the live shell's mirror while the + /// activation runs (see [`Self::live`]), unless a trace function's + /// line jump or `f_lineno` override owns the value. + pub fn lasti_now(&self) -> u32 { + let live = self.live.load(std::sync::atomic::Ordering::Relaxed); + // (A pending jump always comes with its line override.) + if !live.is_null() && self.override_lineno.get().is_none() { + // SAFETY: a linked shell is alive: the link is cleared when the + // shell leaves its spine and again when it is dropped. + let at = unsafe { (*live).lasti.load(std::sync::atomic::Ordering::Relaxed) }; + self.lasti.set(at); + return at; + } + self.lasti.get() + } + + /// Set the current instruction index, in the live shell's mirror too. + pub fn set_lasti(&self, at: u32) { + self.lasti.set(at); + let live = self.live.load(std::sync::atomic::Ordering::Relaxed); + if !live.is_null() { + // SAFETY: as in `lasti_now`. + unsafe { + (*live) + .lasti + .store(at, std::sync::atomic::Ordering::Relaxed) + }; + } + } + + /// Settle the frame as its activation leaves the spine on `shell`: + /// the shell's last instruction becomes the object's own. + pub(crate) fn unlink_live(&self, shell: &FrameShell) { + if std::ptr::eq(self.live.load(std::sync::atomic::Ordering::Relaxed), shell) { + shell.refresh_materialized(self); + self.live + .store(std::ptr::null_mut(), std::sync::atomic::Ordering::Relaxed); + } + } + /// Compute a fresh locals mapping from the live frame state — /// the class/module namespace itself for those scopes, or a /// fast-locals snapshot dict for function scopes. This replaces @@ -672,7 +721,7 @@ impl PyFrame { let mirror = self.locals_mirror.borrow().clone()?; let snapshot = mirror.borrow(); let varnames = &self.code.varnames; - let cell_names: Vec<&String> = self + let cell_names: Vec<&weavepy_compiler::Name> = self .code .cellvars .iter() @@ -748,7 +797,7 @@ impl PyFrame { if name.starts_with('.') || out.iter().any(|n| n == name) { continue; } - out.push(name.clone()); + out.push(name.to_string()); } out } @@ -1163,6 +1212,16 @@ impl std::ops::Deref for FrameSlot { } } +impl Drop for FrameShell { + fn drop(&mut self) { + // A frame object outliving its shell (a spine dropped whole) must + // not read through a dead link. + if let Some(py) = self.materialized.get_mut().take() { + py.unlink_live(self); + } + } +} + impl FrameShell { /// Make every borrowed slot own its value (see [`FrameSlot`]). pub(crate) fn upgrade_slots(&self) { @@ -1199,39 +1258,37 @@ impl FrameShell { } } - /// Build the real [`PyFrame`] for this shell with the given - /// `back` pointer, caching it. Bumps `on_stack` exactly once per - /// materialisation — the pop path decrements it for shells whose - /// `materialized` is set. - /// Bring an existing frame object's `lasti` up to this live shell's. - /// The executing frame's quiet loops sync only the shell while nothing - /// else holds the object (see `Interpreter::frame_object_observed`); - /// every path that hands the object out calls this first. A trace + /// Bring an existing frame object's `lasti` up to this shell's: the + /// dispatch loops sync only the shell (see [`PyFrame::live`]). A trace /// function's pending line jump owns the value and is left alone. pub fn refresh_materialized(&self, py: &PyFrame) { - if py.pending_jump.borrow().is_none() && py.override_lineno.get().is_none() { + // (A pending jump always comes with its line override.) + if py.override_lineno.get().is_none() { py.lasti .set(self.lasti.load(std::sync::atomic::Ordering::Relaxed)); } } + /// Make `py` read its `lasti` from this shell, which is on its spine + /// and keeps `py` as its frame object (see [`PyFrame::live`]). + pub(crate) fn link(&self, py: &PyFrame) { + py.live.store( + std::ptr::from_ref(self).cast_mut(), + std::sync::atomic::Ordering::Relaxed, + ); + } + + /// Build the real [`PyFrame`] for this shell, which is on its spine, + /// with the given `back` pointer, caching it. Bumps `on_stack` exactly + /// once per materialisation — the pop path decrements it for shells + /// whose `materialized` is set. pub fn materialize(&self, back: Option>) -> Rc { - let py = self.materialize_departing(back); - // RFC 0065 (WS1): a freshly materialized frame must kick its - // dispatch loop off the quiet path so the per-instruction - // `lasti`-cell sync resumes. - crate::hot_gates::bump_loop_gen(); - py + self.materialize_departing(back) } - /// [`Self::materialize`] for an activation that is leaving the spine: - /// no dispatch loop will run it again, so none needs kicking off its - /// quiet path. + /// [`Self::materialize`] for an activation that is leaving the spine. pub fn materialize_departing(&self, back: Option>) -> Rc { if let Some(existing) = self.materialized.borrow().as_ref() { - // (`materialize` still bumps: the new holder may keep it, and - // a quiet loop running this activation re-derives, finding it - // observed if so.) self.refresh_materialized(existing); return existing.clone(); } @@ -1259,7 +1316,9 @@ impl FrameShell { extra_locals: RefCell::new(None), cleared: Cell::new(false), lazy_back: RefCell::new(None), + live: std::sync::atomic::AtomicPtr::new(std::ptr::null_mut()), }); + self.link(&py); *self.materialized.borrow_mut() = Some(py.clone()); self.has_materialized .store(true, std::sync::atomic::Ordering::Release); @@ -1326,13 +1385,12 @@ pub fn materialize_stack_at(stack: &FrameStack, idx: usize) -> Option> = None; - let mut refreshed = false; for shell in &s[..=idx] { let existing = shell.materialized.borrow().clone(); let py = match existing { Some(py) => { shell.refresh_materialized(&py); - refreshed = true; + shell.link(&py); py.set_back(back); py } @@ -1344,14 +1402,70 @@ pub fn materialize_stack_at(stack: &FrameStack, idx: usize) -> Option Option> { + let s = stack.borrow(); + let shell = s.get(idx)?; + let caller = idx.checked_sub(1).map(|i| &s[i]); + if shell.is_gen || caller.is_some_and(|c| c.is_gen) { + drop(s); + return materialize_stack_at(stack, idx); + } + let existing = shell.materialized.borrow().clone(); + let py = match existing { + Some(py) => { + shell.refresh_materialized(&py); + shell.link(&py); + py + } + // Counted as live on the stack, as the eager walk counts it. + None => shell.materialize(None), + }; + match caller { + None => py.set_back(None), + Some(c) => { + let caller_py = c.materialized.borrow().clone(); + match caller_py { + Some(back) => { + c.refresh_materialized(&back); + c.link(&back); + let linked = py.lazy_back.borrow().is_none() + && py + .back + .borrow() + .as_ref() + .is_some_and(|b| Rc::ptr_eq(b, &back)); + if !linked { + py.set_back(Some(back)); + } + } + None => { + let linked = py.back.borrow().is_none() + && py + .lazy_back + .borrow() + .as_ref() + .is_some_and(|l| Rc::ptr_eq(&l.0, c)); + if !linked { + *py.back.borrow_mut() = None; + *py.lazy_back.borrow_mut() = Some(LazyShellRef::new(c.clone())); + } + } + } + } + } + Some(py) +} + /// Materialise and return the top frame of a stack, or `None` when /// the stack is empty. pub fn materialize_stack_top(stack: &FrameStack) -> Option> { @@ -1480,14 +1594,13 @@ impl PyTraceback { /// the one it already has, else materialized where it sits on this /// thread's spine (linking `f_back` like any other materialization). pub(crate) fn materialize_shell(shell: &Rc) -> Rc { - if let Some(handles) = crate::vm_singletons::current_thread_handles() { - let idx = handles - .frame_stack + if let Some(frame_stack) = crate::vm_singletons::current_frame_stack() { + let idx = frame_stack .borrow() .iter() .rposition(|s| Rc::ptr_eq(s, shell)); if let Some(idx) = idx { - if let Some(py) = materialize_stack_at(&handles.frame_stack, idx) { + if let Some(py) = materialize_stack_at_lazy(&frame_stack, idx) { return py; } } @@ -1505,7 +1618,7 @@ pub(crate) fn materialize_shell(shell: &Rc) -> Rc { .ok() .and_then(|s| s.iter().rposition(|s| Rc::ptr_eq(s, shell))); if let Some(idx) = idx { - if let Some(py) = materialize_stack_at(&stack, idx) { + if let Some(py) = materialize_stack_at_lazy(&stack, idx) { return py; } } @@ -1522,12 +1635,15 @@ impl Drop for PyTraceback { // is a `tb_next` linked list one node per stack level, so a // ~1000-deep traceback (a `RecursionError`) would drop recursively // and overflow the native stack. Tear the chain down iteratively. + // (The last owner of each link detaches its successor in place, + // then frees a node with nothing left to chain to.) let mut link = self.next.borrow_mut().take(); while let Some(tb) = link { - match Rc::try_unwrap(tb) { - Ok(inner) => link = inner.next.borrow_mut().take(), - Err(_) => break, + if Rc::strong_count(&tb) != 1 { + break; } + link = tb.next.borrow_mut().take(); + drop(tb); } } } @@ -2322,7 +2438,7 @@ impl DictViewKind { } /// Live view over a backing `dict`. Iteration order mirrors the -/// underlying `IndexMap`. Mutations to the dict propagate through +/// underlying table. Mutations to the dict propagate through /// the view (CPython invariant). #[derive(Debug)] pub struct PyDictView { @@ -2596,9 +2712,9 @@ pub struct SlotDescriptor { pub objclass: RefCell>>, } -/// Ordered set backing for [`Object::Set`] and [`Object::FrozenSet`]. -/// Fast-hashed for the same reason as [`DictData`]. -pub type SetData = indexmap::IndexSet; +/// Set backing for [`Object::Set`] and [`Object::FrozenSet`]: the dict +/// table's layout without values (see [`crate::dictmap::SetMap`]). +pub type SetData = crate::dictmap::SetMap; /// Backing object for [`Object::FrozenSet`]: the element storage plus a /// lazily-computed hash cache. @@ -3186,9 +3302,22 @@ static MODULE_CLASS: std::sync::LazyLock< /// Record `m.__class__ = cls`. The caller validates that `cls` is a /// `ModuleType` subclass. pub fn set_module_class(m: &Rc, cls: Object) { + MODULE_CLASSES_SET.store(true, std::sync::atomic::Ordering::Release); MODULE_CLASS.write().insert(Rc::as_ptr(m) as usize, cls); } +/// Whether any module ever got a class of its own (see +/// [`set_module_class`]): until then every module's attributes are its +/// dictionary's, `ModuleType`'s own descriptors aside. +static MODULE_CLASSES_SET: std::sync::atomic::AtomicBool = + std::sync::atomic::AtomicBool::new(false); + +/// [`MODULE_CLASSES_SET`]. +#[inline] +pub fn module_classes_possible() -> bool { + MODULE_CLASSES_SET.load(std::sync::atomic::Ordering::Acquire) +} + /// The class assigned via [`set_module_class`], if any. `None` means the /// stock `types.ModuleType`. pub fn module_class(m: &Rc) -> Option> { @@ -3199,7 +3328,9 @@ pub fn module_class(m: &Rc) -> Option> { } /// Dictionary key: a hashable [`Object`] wrapped to satisfy the -/// `Hash + Eq` requirements imposed by `HashMap` / `IndexMap`. +/// `Hash + Eq` requirements of `HashMap`, and the stored key type of a +/// dict's [`crate::dictmap::DictMap`] and a set's +/// [`crate::dictmap::SetMap`]. #[derive(Clone, Debug)] pub struct DictKey(pub Object); @@ -3224,21 +3355,36 @@ pub struct DictKey(pub Object); #[derive(Debug, Clone, Copy)] pub struct StrKey<'a>(pub &'a str); -impl Hash for StrKey<'_> { +impl crate::dictmap::Probe for StrKey<'_> { #[inline] - fn hash(&self, state: &mut H) { + fn probe_hash(&self) -> i64 { // Bit-for-bit the `DictKey` hash of `Object::Str(self.0)`. - py_str_hash(self.0).hash(state); + py_str_hash(self.0) + } + + #[inline] + fn probe_eq_unhashed(&self, key: &DictKey) -> Option { + // Comparing a name with a small table's stored strings costs less + // than hashing it. + match &key.0 { + Object::Str(s) => Some( + std::ptr::eq(s.as_ptr(), self.0.as_ptr()) + || crate::dictmap::key_bytes_eq(s.as_bytes(), self.0.as_bytes()), + ), + Object::WStr(_) => Some(false), + _ => None, + } } -} -impl indexmap::Equivalent for StrKey<'_> { #[inline] - fn equivalent(&self, key: &DictKey) -> bool { + fn probe_eq(&self, key: &DictKey) -> bool { match &key.0 { // Interned names probe with the stored key's own bytes: the // pointer settles it before any byte compare. - Object::Str(s) => std::ptr::eq(s.as_ptr(), self.0.as_ptr()) || &**s == self.0, + Object::Str(s) => { + std::ptr::eq(s.as_ptr(), self.0.as_ptr()) + || crate::dictmap::key_bytes_eq(s.as_bytes(), self.0.as_bytes()) + } // A `WStr` always carries a lone surrogate (module invariant), // so it can never equal a valid `&str`. Object::WStr(_) => false, @@ -3251,6 +3397,48 @@ impl indexmap::Equivalent for StrKey<'_> { } } +/// [`StrKey`] for a probe of several tables (an MRO walk): the name's hash +/// is computed on first need and kept, so the walk hashes it at most once, +/// and not at all while it meets only small tables (which compare names +/// directly; see [`crate::dictmap::Probe::probe_eq_unhashed`]). +#[derive(Debug)] +pub struct StrKeyLazy<'a> { + pub s: &'a str, + hash: std::cell::Cell>, +} + +impl<'a> StrKeyLazy<'a> { + #[inline] + pub fn new(s: &'a str) -> Self { + Self { + s, + hash: std::cell::Cell::new(None), + } + } +} + +impl crate::dictmap::Probe for StrKeyLazy<'_> { + #[inline] + fn probe_hash(&self) -> i64 { + if let Some(h) = self.hash.get() { + return h; + } + let h = py_str_hash(self.s); + self.hash.set(Some(h)); + h + } + + #[inline] + fn probe_eq(&self, key: &DictKey) -> bool { + crate::dictmap::Probe::probe_eq(&StrKey(self.s), key) + } + + #[inline] + fn probe_eq_unhashed(&self, key: &DictKey) -> Option { + crate::dictmap::Probe::probe_eq_unhashed(&StrKey(self.s), key) + } +} + /// [`StrKey`] with its Python hash precomputed (RFC 0077 WS4). The /// interpreter's attribute-name probes hash the same `co_names` entry on /// every execution of a site — a siphash per probe — so the VM memoises @@ -3264,17 +3452,15 @@ pub struct StrKeyHashed<'a> { pub hash: i64, } -impl Hash for StrKeyHashed<'_> { +impl crate::dictmap::Probe for StrKeyHashed<'_> { #[inline] - fn hash(&self, state: &mut H) { - self.hash.hash(state); + fn probe_hash(&self) -> i64 { + self.hash } -} -impl indexmap::Equivalent for StrKeyHashed<'_> { #[inline] - fn equivalent(&self, key: &DictKey) -> bool { - indexmap::Equivalent::equivalent(&StrKey(self.s), key) + fn probe_eq(&self, key: &DictKey) -> bool { + crate::dictmap::Probe::probe_eq(&StrKey(self.s), key) } } @@ -3307,18 +3493,19 @@ impl<'a> LeafNameProbe<'a> { } } -impl Hash for LeafNameProbe<'_> { +impl crate::dictmap::Probe for LeafNameProbe<'_> { #[inline] - fn hash(&self, state: &mut H) { - self.hash.hash(state); + fn probe_hash(&self) -> i64 { + self.hash } -} -impl indexmap::Equivalent for LeafNameProbe<'_> { #[inline] - fn equivalent(&self, key: &DictKey) -> bool { + fn probe_eq(&self, key: &DictKey) -> bool { match &key.0 { - Object::Str(k) => std::ptr::eq(k.as_ptr(), self.s.as_ptr()) || &**k == self.s, + Object::Str(k) => { + std::ptr::eq(k.as_ptr(), self.s.as_ptr()) + || crate::dictmap::key_bytes_eq(k.as_bytes(), self.s.as_bytes()) + } // A lone surrogate never equals a valid `&str`. Object::WStr(_) => false, _ => { @@ -3350,11 +3537,40 @@ impl<'a> LeafProbe<'a> { /// metaclass keeps `type`'s `__hash__` and `__eq__`, a function, /// generator-family object or module, or a tuple of machine ints and /// strings. - #[inline] + #[inline(always)] pub fn new(key: &'a Object) -> Option { let hash = match key { Object::Str(s) => SharedStr::hash_cached(s), - Object::Int(_) => py_hash_value(key)?, + Object::Int(i) => py_hash_long_i64(*i), + _ => Self::other_hash(key)?, + }; + Some(Self { + key, + hash, + foreign: std::cell::Cell::new(false), + }) + } + + /// A probe for a class that hashes and compares by identity (see + /// [`type_hash_is_identity`]), checked by the caller. + #[inline(always)] + pub(crate) fn identity_type(key: &'a Object) -> Self { + let hash = match key { + // (As `identity_hash` hashes a class.) + Object::Type(t) => pointer_hash(Rc::as_ptr(t).cast()), + _ => identity_hash(key), + }; + Self { + key, + hash, + foreign: std::cell::Cell::new(false), + } + } + + /// [`Self::new`]'s hash for a key other than a `str` or an `int`. + #[inline(never)] + fn other_hash(key: &Object) -> Option { + Some(match key { Object::Instance(i) if i.native.get().is_none() && i.class_dunder(crate::types::Dunder::Hash).object_owner() => @@ -3377,11 +3593,6 @@ impl<'a> LeafProbe<'a> { | Object::AsyncGenerator(_) | Object::Module(_) => identity_hash(key), _ => return None, - }; - Some(Self { - key, - hash, - foreign: std::cell::Cell::new(false), }) } @@ -3423,23 +3634,34 @@ fn meta_hash_is_identity(m: &crate::Rc) -> bool { && !m.dunder(crate::types::Dunder::Eq).user_defined()) } -impl Hash for LeafProbe<'_> { - #[inline] - fn hash(&self, state: &mut H) { - self.hash.hash(state); +impl crate::dictmap::Probe for LeafProbe<'_> { + #[inline(always)] + fn probe_hash(&self) -> i64 { + self.hash } -} -impl indexmap::Equivalent for LeafProbe<'_> { - #[inline] - fn equivalent(&self, key: &DictKey) -> bool { + #[inline(always)] + fn probe_eq(&self, key: &DictKey) -> bool { match (self.key, &key.0) { // (The same string object, an interned name's usual case, // settles before any byte compare.) (Object::Str(a), Object::Str(b)) => { - std::ptr::eq(a.as_ptr(), b.as_ptr()) || a.as_bytes() == b.as_bytes() + SharedStr::ptr_eq(a, b) || crate::dictmap::key_bytes_eq(a.as_bytes(), b.as_bytes()) } (Object::Int(a), Object::Int(b)) => a == b, + // The same class (a class probe meets its own entry). + (Object::Type(a), Object::Type(b)) if Rc::ptr_eq(a, b) => true, + _ => self.other_eq(key), + } + } +} + +impl LeafProbe<'_> { + /// [`crate::dictmap::Probe::probe_eq`] for any pairing but two `str`s + /// or two `int`s. + #[inline(never)] + fn other_eq(&self, key: &DictKey) -> bool { + match (self.key, &key.0) { // Identity settles an instance probe (CPython compares keys // with `is` first); any other pairing may need `__eq__`. (Object::Instance(a), Object::Instance(b)) if Rc::ptr_eq(a, b) => true, @@ -3804,7 +4026,9 @@ impl PartialEq for DictKey { // Two plain strings or machine ints, the common keys, are equal by // value alone. match (&self.0, &other.0) { - (Object::Str(a), Object::Str(b)) => return a.as_bytes() == b.as_bytes(), + (Object::Str(a), Object::Str(b)) => { + return crate::dictmap::key_bytes_eq(a.as_bytes(), b.as_bytes()); + } (Object::Int(a), Object::Int(b)) => return a == b, _ => {} } @@ -3839,8 +4063,8 @@ impl PartialEq for DictKey { } // CPython dispatches `__eq__` only between keys in the *same // hash bucket*; unequal hashes mean "not equal" without any - // user code. indexmap's small-table linear scan compares every - // entry through this `eq` with no hash check at all, so enforce + // user code. The tables compare stored hashes first, but a + // caller comparing two keys directly does not, so enforce // the bucket precondition here — sqlalchemy's // `constraints.discard(ColumnSet())` probes a 1-element set // with a key whose `__eq__` returns a SQL clause that *raises* @@ -3898,19 +4122,6 @@ thread_local! { /// Park `err` as the pending key-comparison error (first one wins, matching /// CPython aborting on the first failed compare). Called from the reentrant /// `__hash__`/`__eq__` bridges when the callback raises. -/// `indexmap` skips hashing when probing a table of 0 or 1 entries (it -/// compares the lone entry directly). CPython always calls `__hash__` -/// first, so a raising `__hash__` must still surface for `x in {'a'}` -/// (test_set.test_unhashable_element's `HashError`). Only a user -/// instance with a Python `__hash__` is affected; the call runs inside a -/// `key_cmp_scope`, so a raised exception is stashed and re-raised there. -#[inline] -pub(crate) fn force_hash_for_tiny_table(len: usize, key: &Object) { - if len <= 1 && dict_key_is_reentrant(key) { - let _ = py_hash_value(key); - } -} - pub(crate) fn stash_key_cmp_error(err: RuntimeError) { KEY_COMPARISON.with(|state| { let mut slot = state.error.borrow_mut(); @@ -3925,7 +4136,7 @@ fn key_cmp_error_pending() -> bool { KEY_COMPARISON.with(|state| state.error.borrow().is_some()) } -/// Run `f` — a closure that performs `IndexSet`/`IndexMap` probes which may +/// Run `f` — a closure that performs set or dict probes which may /// re-enter a Python `__hash__`/`__eq__` — and surface any exception those /// callbacks raised. The pending error of an *outer* scope is saved across /// the call and restored afterwards, so a re-entrant set/dict mutation from @@ -4019,17 +4230,10 @@ pub(crate) fn dict_key_is_reentrant(key: &Object) -> bool { } } -/// The table-level (Fx-mixed) hash for a Python hash value, matching what -/// `DictKey::hash` feeds the [`DictData`] hasher. -fn dict_table_hash(py_hash: i64) -> u64 { - use std::hash::BuildHasher; - crate::fasthash::FxBuildHasher.hash_one(py_hash) -} - -/// Probe result of [`dict_reentrant_probe`]: the key's table-level hash -/// plus the equal *stored* key, if any. +/// Probe result of [`dict_reentrant_probe`]: the key's Python hash plus +/// the equal *stored* key, if any. pub(crate) struct ReentrantProbe { - table_hash: u64, + hash: i64, stored: Option, } @@ -4048,9 +4252,7 @@ pub(crate) fn dict_reentrant_probe( d: &RefCell, key: &Object, ) -> Result { - use indexmap::map::raw_entry_v1::RawEntryApiV1; let kh = key_cmp_scope(|| py_hash_value(key))?.unwrap_or_else(|| identity_hash(key)); - let table_hash = dict_table_hash(kh); let mut memo: Vec<(Object, bool)> = Vec::new(); loop { // Same-hash candidates, collected under a short borrow with a @@ -4058,7 +4260,7 @@ pub(crate) fn dict_reentrant_probe( let mut cands: Vec = Vec::new(); { let m = d.borrow(); - let _ = m.raw_entry_v1().from_hash(table_hash, |k| { + let _ = m.find_by_hash(kh, |k| { cands.push(k.0.clone()); false }); @@ -4083,19 +4285,8 @@ pub(crate) fn dict_reentrant_probe( } continue; } - // Same-bucket precondition: indexmap's small-table linear scan - // hands `from_hash` every entry regardless of hash, but CPython - // only ever dispatches `__eq__` between keys whose hashes match. - // The stored key's hash comes from its record (CPython reads the - // entry's `me_hash`); only a record-less key pays a dispatch. - let sh = match recorded_key_hash(stored) { - Some(h) => h, - None => key_cmp_scope(|| py_hash_value(stored))? - .unwrap_or_else(|| identity_hash(stored)), - }; - if sh != kh { - continue; - } + // (The table hands over only keys whose stored hash equals the + // probe's, CPython's `me_hash` check, so no hash is recomputed.) // Python `__eq__` (stored first, CPython's argument order) with // no borrow held; it may mutate `d` re-entrantly. let eq = key_cmp_scope(|| current_interp_eq(stored, key))?.unwrap_or(false); @@ -4105,7 +4296,7 @@ pub(crate) fn dict_reentrant_probe( } if found.is_some() || !fresh_call { return Ok(ReentrantProbe { - table_hash, + hash: kh, stored: found, }); } @@ -4130,25 +4321,22 @@ pub(crate) fn dict_reentrant_insert( key: Object, value: Object, ) -> Result, RuntimeError> { - use indexmap::map::raw_entry_v1::{RawEntryApiV1, RawEntryMut}; let probe = dict_reentrant_probe(d, &key)?; let target = probe.stored.as_ref().unwrap_or(&key); let mut m = d.borrow_mut(); - match m - .raw_entry_mut_v1() - .from_hash(probe.table_hash, |k| k.0.is_same(target)) - { - RawEntryMut::Occupied(mut e) => { - let same = e.get().is_same(&value); - let old = e.insert(value); + match m.find_by_hash(probe.hash, |k| k.0.is_same(target)) { + Some(i) => { + let (_, slot) = m.get_index_mut(i).expect("found above"); + let same = slot.is_same(&value); + let old = std::mem::replace(slot, value); drop(m); if !same { dict_mutation_event(d); } Ok(Some(old)) } - RawEntryMut::Vacant(e) => { - e.insert_hashed_nocheck(probe.table_hash, DictKey(key), value); + None => { + m.insert_unique_hashed(probe.hash, DictKey(key), value); drop(m); dict_watch_bump(d); dict_mutation_event(d); @@ -4165,17 +4353,13 @@ pub(crate) fn dict_reentrant_setdefault( key: Object, default: Object, ) -> Result { - use indexmap::map::raw_entry_v1::{RawEntryApiV1, RawEntryMut}; let probe = dict_reentrant_probe(d, &key)?; let target = probe.stored.as_ref().unwrap_or(&key); let mut m = d.borrow_mut(); - match m - .raw_entry_mut_v1() - .from_hash(probe.table_hash, |k| k.0.is_same(target)) - { - RawEntryMut::Occupied(e) => Ok(e.get().clone()), - RawEntryMut::Vacant(e) => { - e.insert_hashed_nocheck(probe.table_hash, DictKey(key), default.clone()); + match m.find_by_hash(probe.hash, |k| k.0.is_same(target)) { + Some(i) => Ok(m.get_index(i).expect("found above").1.clone()), + None => { + m.insert_unique_hashed(probe.hash, DictKey(key), default.clone()); drop(m); dict_watch_bump(d); dict_mutation_event(d); @@ -4189,14 +4373,14 @@ pub(crate) fn dict_reentrant_get( d: &RefCell, key: &Object, ) -> Result, RuntimeError> { - use indexmap::map::raw_entry_v1::RawEntryApiV1; let probe = dict_reentrant_probe(d, key)?; match probe.stored { - Some(stored) => Ok(d - .borrow() - .raw_entry_v1() - .from_hash(probe.table_hash, |k| k.0.is_same(&stored)) - .map(|(_, v)| v.clone())), + Some(stored) => { + let m = d.borrow(); + Ok(m.find_by_hash(probe.hash, |k| k.0.is_same(&stored)) + .and_then(|i| m.get_index(i)) + .map(|(_, v)| v.clone())) + } None => Ok(None), } } @@ -4208,13 +4392,11 @@ pub(crate) fn dict_index_of( d: &RefCell, key: &Object, ) -> Result, RuntimeError> { - use indexmap::map::raw_entry_v1::RawEntryApiV1; let probe = dict_reentrant_probe(d, key)?; match probe.stored { Some(stored) => Ok(d .borrow() - .raw_entry_v1() - .index_from_hash(probe.table_hash, |k| k.0.is_same(&stored))), + .find_by_hash(probe.hash, |k| k.0.is_same(&stored))), None => Ok(None), } } @@ -4224,23 +4406,19 @@ pub(crate) fn dict_reentrant_remove( d: &RefCell, key: &Object, ) -> Result, RuntimeError> { - use indexmap::map::raw_entry_v1::{RawEntryApiV1, RawEntryMut}; let probe = dict_reentrant_probe(d, key)?; match probe.stored { Some(stored) => { let mut m = d.borrow_mut(); - match m - .raw_entry_mut_v1() - .from_hash(probe.table_hash, |k| k.0.is_same(&stored)) - { - RawEntryMut::Occupied(e) => { - let (k, v) = e.shift_remove_entry(); + match m.find_by_hash(probe.hash, |k| k.0.is_same(&stored)) { + Some(i) => { + let (k, v) = m.shift_remove_index(i).expect("found above"); drop(m); dict_watch_bump(d); dict_mutation_event(d); Ok(Some((k.0, v))) } - RawEntryMut::Vacant(_) => Ok(None), + None => Ok(None), } } None => Ok(None), @@ -4254,7 +4432,7 @@ pub(crate) fn dict_reentrant_remove( // same `ma_used`, so the size trip-wire stays silent — because the delete // leaves a tombstone and the reinsert *appends*: the iterator then finds an // entry beyond the `di->len` elements it expected and raises `RuntimeError: -// dictionary keys changed during iteration`. Our `IndexMap` has no +// dictionary keys changed during iteration`. Our table has no // tombstones (`shift_remove` compacts in place), so the layout carries no // trace of the churn. Instead, dict iterators register a *watch* on their // source dict; the centralized structural mutators (`dict_insert` on a new @@ -4371,8 +4549,8 @@ pub(crate) fn dict_watch_bump(d: &RefCell) { // `_testcapi.dict_get_version` exposes it and `test_dict_version` asserts // the full semantics. // -// WeavePy's `DictData` is a bare `IndexMap` with no room for a per-dict -// field, so versions live in a side registry keyed by the dict's heap +// WeavePy's `DictData` has no room for a per-dict PEP 509 field, so +// versions live in a side registry keyed by the dict's heap // address and assigned lazily: the first `dict_version_get` on a dict // registers it with a fresh tag; the centralized mutators // (`dict_insert`/`dict_remove`/`clear`/`popitem`/`setdefault` and the @@ -4456,8 +4634,20 @@ impl Hash for DictKey { // (functions, types, plain instances, …) fold in their allocation // identity; truly unhashable keys share a constant bucket and the // runtime raises lazily when used. - let h = py_hash_value(&self.0).unwrap_or_else(|| identity_hash(&self.0)); - h.hash(state); + dict_key_hash(&self.0).hash(state); + } +} + +/// The Python hash a dict or set stores for key `k`: its `hash()`, or its +/// identity hash for an unhashable key (the runtime raises before such a +/// key is stored). +#[inline] +pub(crate) fn dict_key_hash(k: &Object) -> i64 { + match k { + // (The commonest keys, without the general dispatch.) + Object::Str(s) => SharedStr::hash_cached(s), + Object::Int(i) => py_hash_long_i64(*i), + other => py_hash_value(other).unwrap_or_else(|| identity_hash(other)), } } @@ -4469,7 +4659,7 @@ impl Hash for DictKey { /// (one multiply) instead of SipHash, which profiled as a top-ten CPU /// consumer under pandas. Not attacker-relevant: collision resistance /// comes from the Python-level hash, exactly as in CPython's own tables. -pub type DictMap = indexmap::IndexMap; +pub type DictMap = crate::dictmap::DictMap; /// The global source of [`DictData::mutation_stamp`] values: one /// monotonically increasing counter for every dict in the process, so a @@ -4584,6 +4774,17 @@ impl DictData { } } + /// An instance `__dict__` holding `map`, guarding the deferred + /// tracking of the instance at `owner` (`0`: none). + pub(crate) fn from_map_for(owner: usize, map: DictMap) -> Self { + Self { + map, + stamp: next_dict_stamp(), + deferred_owner: std::sync::atomic::AtomicUsize::new(owner), + key_filter: std::sync::atomic::AtomicU64::new(0), + } + } + /// Re-arm the owner record on a recycled (empty) instance dict. #[inline] pub(crate) fn reset_deferred_owner(&mut self, owner: usize) { @@ -4753,7 +4954,7 @@ impl Extend<(DictKey, Object)> for DictData { impl IntoIterator for DictData { type Item = (DictKey, Object); - type IntoIter = indexmap::map::IntoIter; + type IntoIter = crate::dictmap::IntoIter; fn into_iter(self) -> Self::IntoIter { self.map.into_iter() @@ -4762,7 +4963,7 @@ impl IntoIterator for DictData { impl<'a> IntoIterator for &'a DictData { type Item = (&'a DictKey, &'a Object); - type IntoIter = indexmap::map::Iter<'a, DictKey, Object>; + type IntoIter = crate::dictmap::Iter<'a>; fn into_iter(self) -> Self::IntoIter { self.map.iter() @@ -4771,7 +4972,7 @@ impl<'a> IntoIterator for &'a DictData { impl<'a> IntoIterator for &'a mut DictData { type Item = (&'a DictKey, &'a mut Object); - type IntoIter = indexmap::map::IterMut<'a, DictKey, Object>; + type IntoIter = crate::dictmap::IterMut<'a>; fn into_iter(self) -> Self::IntoIter { (**self).iter_mut() @@ -4780,7 +4981,7 @@ impl<'a> IntoIterator for &'a mut DictData { #[derive(Clone)] pub struct PyFunction { - pub name: String, + pub name: weavepy_compiler::Name, /// The code object executed on call. Interior-mutable because /// `f.__code__ = other.__code__` rebinds it at runtime (CPython's /// `func_set_code`); every call reads the *current* value. @@ -4833,6 +5034,14 @@ pub struct PyFunction { /// slot-store probe for the overwhelmingly common function that never /// had them overridden. pub defaults_override: OverrideFlag, + /// The [`Self::slots`] state (its mutation stamp, `0` for none) in + /// which `__name__` and `__qualname__` were last found to be the + /// current code's own interned names (see [`Self::code_names_kept`]). + /// Cleared when `__code__` is rebound. + pub names_kept: crate::sync::Cell, + /// The function's slot in the cycle collector's registry (see + /// [`crate::gc_trace::GcSlot`]). + pub gc_slot: crate::gc_trace::GcSlot, } /// A function's getset slots before their first read (see @@ -5041,6 +5250,35 @@ impl PyFunction { ) } + /// Whether `__name__` and `__qualname__` are the very objects `names` + /// gives (the current code's interned names, which a generator made + /// by this function then reports by default): the slots' seed, or + /// slots in a state already found to hold them, answer without a + /// probe. + pub fn code_names_kept(&self, names: impl FnOnce() -> (Object, Object)) -> bool { + if self.names_seeded() { + return true; + } + let Some(slots) = self.slots_raw.get() else { + return false; + }; + let stamp = match slots.try_borrow() { + Ok(s) => s.mutation_stamp(), + Err(_) => return false, + }; + if stamp == self.names_kept.get() { + return true; + } + let (name, qualname) = self.name_objects(); + let (code_name, code_qualname) = names(); + let kept = name.is_some_and(|n| n.is_same(&code_name)) + && qualname.is_some_and(|q| q.is_same(&code_qualname)); + if kept { + self.names_kept.set(stamp); + } + kept + } + /// Whether the function's slots are still its definition-time seed /// (so `__name__` and `__qualname__` are its code's). pub fn names_seeded(&self) -> bool { @@ -5266,7 +5504,8 @@ pub struct PyGenerator { /// strong reference) so it stays readable after the generator /// finishes and the frame is dropped. pub code: Object, - pub state: RefCell, + /// The execution state, read through [`Self::state`]. + gen_state: RefCell, /// [`Self::name`] and [`Self::qualname`] when they aren't the code's, /// [`Self::origin`] and [`Self::finalizer`]: the state few generators /// carry, allocated when first set. @@ -5282,9 +5521,23 @@ pub struct PyGenerator { /// finalizer (e.g. a PEP 525 hook that declined to close it) is /// not resurrected and re-finalized forever on the next drop. pub finalize_ran: crate::sync::Cell, - /// Whether the cycle collector's index holds an entry for this - /// generator (one still in a young set has none). - pub gc_registered: crate::sync::Cell, + /// The generator's slot in the cycle collector's registry (see + /// [`crate::gc_trace::GcSlot`]); unregistered while it is still in a + /// young set. + pub gc_slot: crate::gc_trace::GcSlot, + /// Not yet handed to the collector: a coroutine an `await` started + /// as it was made runs on the spine (its frame's referents are + /// roots), so it can close no unreachable cycle until it first + /// suspends, which tracks it (see `Interpreter::park_suspended_boxed`). + /// One that finishes first is never tracked. + pub track_deferred: crate::sync::Cell, + /// The collapsed `yield from` chain this generator is a level of (the + /// address of its `ChainRec`, see `Interpreter::core_send_collapse`), + /// or 0. A level of a parked chain is in + /// [`GeneratorState::Delegating`] although nothing runs it: + /// [`Self::state`] puts the chain back as running it would have left + /// it before anything sees the state. + pub(crate) chain: crate::sync::Cell, } /// The state of a [`PyGenerator`] that few carry. @@ -5421,12 +5674,34 @@ impl PyGenerator { Self { kind, code, - state: RefCell::new(GeneratorState::Created(frame)), + gen_state: RefCell::new(GeneratorState::Created(frame)), extras: RefCell::new(None), hooks_inited: crate::sync::Cell::new(false), finalize_ran: crate::sync::Cell::new(false), - gc_registered: crate::sync::Cell::new(false), + gc_slot: crate::gc_trace::GcSlot::new(), + track_deferred: crate::sync::Cell::new(false), + chain: crate::sync::Cell::new(0), + } + } + + /// The generator's state. A level of a parked `yield from` chain (see + /// [`Self::chain`]) is first suspended in its `yield from`, with the + /// rest of the chain, as resuming the chain level by level leaves it. + #[inline(always)] + pub fn state(&self) -> &RefCell { + let chain = self.chain.get(); + if chain != 0 { + crate::settle_parked_chain(chain); } + &self.gen_state + } + + /// The state as it is, a parked chain's level still `Delegating`: for + /// the chain machinery, and for reads that treat a delegating frame + /// as a suspended one (the collector's traversal). + #[inline(always)] + pub(crate) fn state_raw(&self) -> &RefCell { + &self.gen_state } /// [`Self::new`] with the name objects already built (a function's @@ -5451,7 +5726,7 @@ impl PyGenerator { } pub fn is_finished(&self) -> bool { - matches!(&*self.state.borrow(), GeneratorState::Finished) + matches!(&*self.state().borrow(), GeneratorState::Finished) } /// Has the body run at all? A generator still in `Created` has @@ -5459,7 +5734,7 @@ impl PyGenerator { /// `gen_close` marks such a generator closed without throwing /// `GeneratorExit` at it, and `gen_dealloc` frees it outright. pub fn is_unstarted(&self) -> bool { - self.state + self.state() .try_borrow() .is_ok_and(|s| matches!(&*s, GeneratorState::Created(_))) } @@ -5480,17 +5755,22 @@ impl Drop for PyGenerator { // pipeline (`chain(chain(chain(…)))`); dropping it inline recurses // one native stack frame per link and overflows on long chains, so // route it through the iterative trampoline below. - if let Ok(mut state) = self.state.try_borrow_mut() { - let prev = std::mem::replace(&mut *state, GeneratorState::Finished); - drop(state); - if matches!( - prev, - GeneratorState::Suspended(_) - | GeneratorState::Created(_) - | GeneratorState::Delegating(_) - ) { - defer_generator_state_drop(prev); - } + // A parked chain's level settles first (its levels are alive: each + // is held by the one above, the outermost by this generator's + // owners, and this one's frame is still here). + let chain = self.chain.get(); + if chain != 0 { + crate::settle_parked_chain(chain); + } + // (Exclusive: no borrow of the state can be live.) + let state = self.gen_state.get_mut(); + if matches!( + state, + GeneratorState::Suspended(_) + | GeneratorState::Created(_) + | GeneratorState::Delegating(_) + ) { + defer_generator_state_drop(std::mem::replace(state, GeneratorState::Finished)); } crate::weakref_registry::on_death(std::ptr::from_ref(self) as usize as u64); } @@ -6540,6 +6820,46 @@ impl PyFile { /// rewritten to the configured line ending. Universal mode maps `\n`→ /// `os.linesep` (a no-op on WeavePy's Unix targets); `''`/`'\n'` are /// pass-through. + /// `StringIO.write(s)` at the end of the buffer with nothing to + /// translate or encode (the common logging-handler shape): appends `s` + /// and returns `true`. `false` touches nothing; the general path then + /// runs (overwrites, newline translation, an explicit codec). + pub fn mem_text_append(&self, s: &str) -> bool { + if self.encoding.borrow().is_some() + || self + .errors + .borrow() + .as_deref() + .is_some_and(|e| e != "strict") + { + return false; + } + let collapse = match self.newline.borrow().as_deref() { + Some("\n" | "") => false, + None if self.io_kind.get() == IoKind::StringIO => true, + _ => return false, + }; + if collapse && s.as_bytes().contains(&b'\r') { + return false; + } + let Ok(mut backend) = self.backend.try_borrow_mut() else { + return false; + }; + let FileBackend::MemText { data, pos } = &mut *backend else { + return false; + }; + if *pos != data.len() { + return false; + } + data.push_str(s); + *pos = data.len(); + drop(backend); + if collapse { + self.record_seen_newlines(s); + } + true + } + fn translate_newlines_write(&self, s: &str) -> String { match self.newline.borrow().as_deref() { Some("\r") => s.replace('\n', "\r"), @@ -8879,7 +9199,7 @@ pub enum PyIterator { step: Box, }, /// Live iterator over a dict (CPython's `dictiterobject`): walks the - /// `IndexMap` by entry index rather than snapshotting, so it pins no + /// table by entry index rather than snapshotting, so it pins no /// key/value `Rc`s of its own — an overwritten value is freed promptly /// even mid-loop (`test_oob_indexing_dictiter_iternextitem` relies on /// `d[k] = None` firing the old value's `__del__` during iteration), @@ -9372,6 +9692,29 @@ impl PyIterator { } } + /// Step past the item [`Self::pure_peek`] returned (as `next` steps a + /// sequence iterator, whatever the sequence holds now): `false` for + /// any other iterator, untouched. + #[inline] + pub fn pure_skip(&mut self) -> bool { + match self { + PyIterator::List { + index, owner: None, .. + } + | PyIterator::Tuple { index, .. } => *index += 1, + PyIterator::Range { current, step, .. } => *current = current.wrapping_add(*step), + PyIterator::Str { s, index } => match s.get(*index..).and_then(|r| r.chars().next()) { + Some(ch) => *index += ch.len_utf8(), + None => return false, + }, + PyIterator::Reversed { + index, owner: None, .. + } if *index >= 0 => *index -= 1, + _ => return false, + } + true + } + /// Whether this iterator can participate in a reference cycle and so /// should be enrolled with the cycle GC when created (CPython tracks /// these `*_iterator` objects). Scalar iterators (`range`, `str`, @@ -10734,17 +11077,11 @@ impl Object { let key = crate::builtins::set_membership_key(item)?; // A custom `__eq__` raising during a hash collision aborts the // lookup in CPython (test_badcmp `s.__contains__(BadCmp())`). - key_cmp_scope(|| { - force_hash_for_tiny_table(s.borrow().len(), &key.0); - s.borrow().contains(&key) - }) + key_cmp_scope(|| s.borrow().contains(&key)) } Object::FrozenSet(s) => { let key = crate::builtins::set_membership_key(item)?; - key_cmp_scope(|| { - force_hash_for_tiny_table(s.len(), &key.0); - s.contains(&key) - }) + key_cmp_scope(|| s.contains(&key)) } Object::Bytes(haystack) => bytes_membership(haystack, item), Object::ByteArray(haystack) => { @@ -11393,7 +11730,7 @@ impl Object { .slot("__qualname__") .as_ref() .map(Object::to_str) - .unwrap_or_else(|| f.code().qualname.clone()); + .unwrap_or_else(|| f.code().qualname.to_string()); format!("", qual, Rc::as_ptr(f) as usize) } Object::Builtin(b) => { @@ -11439,7 +11776,7 @@ impl Object { .slot("__qualname__") .as_ref() .map(Object::to_str) - .unwrap_or_else(|| f.code().qualname.clone()), + .unwrap_or_else(|| f.code().qualname.to_string()), // A C function bound to its receiver is CPython's // `builtin_function_or_method`, whose repr is // `` @@ -11806,7 +12143,7 @@ impl Object { .slot("__qualname__") .as_ref() .map(Object::to_str) - .unwrap_or_else(|| f.code().qualname.clone()); + .unwrap_or_else(|| f.code().qualname.to_string()); let module = f .slot("__module__") .or_else(|| { @@ -12494,6 +12831,7 @@ pub(crate) fn py_hash_double(v: f64) -> i64 { /// CPython `long_hash` for a machine int: `sign * (|n| mod (2**61-1))`, /// with the reserved `-1` remapped to `-2`. +#[inline] pub(crate) fn py_hash_long_i64(n: i64) -> i64 { // The modulus is the Mersenne prime `2**61 - 1`, so `|n| mod P` folds // the high bits onto the low ones instead of dividing: `|n| < 2**64` @@ -12703,11 +13041,79 @@ fn siphash13(k0: u64, k1: u64, data: &[u8]) -> u64 { (v0 ^ v1) ^ (v2 ^ v3) } +/// The longest byte string [`sip_memo`] remembers. +const SIP_MEMO_MAX: usize = 32; + +/// One remembered SipHash result: the bytes (`len` of them; `0` marks an +/// empty slot) and their hash. +#[derive(Clone, Copy)] +struct SipMemoEntry { + len: u8, + hash: i64, + bytes: [u8; SIP_MEMO_MAX], +} + +const SIP_MEMO_SLOTS: usize = 512; + +thread_local! { + /// A direct-mapped memo of the SipHash of short byte strings, by + /// content. With the seed pinned, a name hashed from a `&str` (a + /// probe of a large dict by `StrKey`, a fresh string's first hash) + /// costs a short compare instead of a SipHash run on a repeat; CPython + /// gets the same effect from the hash cached in each interned name. + static SIP_MEMO: std::cell::UnsafeCell<[SipMemoEntry; SIP_MEMO_SLOTS]> = const { + std::cell::UnsafeCell::new([SipMemoEntry { len: 0, hash: 0, bytes: [0; SIP_MEMO_MAX] }; SIP_MEMO_SLOTS]) + }; +} + +/// `compute(bytes)`, remembered per thread for `bytes` of 1 to +/// [`SIP_MEMO_MAX`] bytes. +#[inline] +fn sip_memo(bytes: &[u8], compute: impl FnOnce(&[u8]) -> i64) -> i64 { + let n = bytes.len(); + debug_assert!((1..=SIP_MEMO_MAX).contains(&n)); + // SAFETY: the loads stay inside `bytes` (overlapping for short ones). + let fold = unsafe { + let p = bytes.as_ptr(); + if n >= 8 { + p.cast::().read_unaligned() + ^ p.add(n - 8).cast::().read_unaligned().rotate_left(29) + } else if n >= 4 { + u64::from(p.cast::().read_unaligned()) + | u64::from(p.add(n - 4).cast::().read_unaligned()) << 32 + } else { + u64::from(*p) | u64::from(*p.add(n / 2)) << 8 | u64::from(*p.add(n - 1)) << 16 + } + }; + let slot = ((fold ^ n as u64).wrapping_mul(0x9E37_79B9_7F4A_7C15) >> 55) as usize; + // SAFETY (both accesses): this thread's memo, borrowed only for the + // statement (nothing inside runs code that could reach it). + let hit = SIP_MEMO.try_with(|memo| { + let e = unsafe { &(*memo.get())[slot] }; + (usize::from(e.len) == n && crate::dictmap::key_bytes_eq(bytes, &e.bytes[..n])) + .then_some(e.hash) + }); + if let Ok(Some(h)) = hit { + return h; + } + let h = compute(bytes); + let _ = SIP_MEMO.try_with(|memo| { + let e = unsafe { &mut (*memo.get())[slot] }; + e.len = n as u8; + e.hash = h; + e.bytes[..n].copy_from_slice(bytes); + }); + h +} + fn py_hash_bytes_slice(bytes: &[u8]) -> i64 { if bytes.is_empty() { return 0; } let v = match hash_algo() { + HashAlgo::Sip { k0, k1 } if bytes.len() <= SIP_MEMO_MAX => { + sip_memo(bytes, |b| siphash13(*k0, *k1, b) as i64) + } HashAlgo::Sip { k0, k1 } => siphash13(*k0, *k1, bytes) as i64, HashAlgo::Fx { salt } => { use std::hash::Hasher; @@ -12796,20 +13202,24 @@ pub fn py_wstr_hash(cps: &[u32]) -> i64 { py_hash_bytes_slice(&buf) } +/// CPython's pointer hash of the allocation at `p` (see [`identity_hash`]). +#[inline(always)] +pub(crate) fn pointer_hash(p: *const ()) -> i64 { + let u = p as usize as u64; + let v = u.rotate_right(4) as i64; + if v == -1 { + -2 + } else { + v + } +} + /// Identity-based hash for objects that hash by allocation identity in /// CPython (functions, types, modules, plain instances without a custom /// `__hash__`, …). Mirrors CPython's pointer hash: rotate so the low /// alignment zero-bits don't waste bucket entropy, remapping `-1` to `-2`. pub(crate) fn identity_hash(obj: &Object) -> i64 { - fn rot(p: *const ()) -> i64 { - let u = p as usize as u64; - let v = u.rotate_right(4) as i64; - if v == -1 { - -2 - } else { - v - } - } + let rot = pointer_hash; match obj { Object::Function(r) => rot(Rc::as_ptr(r).cast()), Object::Builtin(r) => rot(Rc::as_ptr(r).cast()), @@ -13038,6 +13448,12 @@ fn frozenset_style_hash>(lanes: I) -> i64 { } pub(crate) fn py_hash_value(obj: &Object) -> Option { + // The commonest keys first, in line. + match obj { + Object::Int(i) => return Some(py_hash_long_i64(*i)), + Object::Str(s) => return Some(SharedStr::hash_cached(s)), + _ => {} + } if let Some(h) = numeric_hash(obj) { return Some(h); } @@ -13078,6 +13494,24 @@ pub(crate) fn py_hash_value(obj: &Object) -> Option { if let Some(hash) = items.cached_hash() { return Some(hash); } + // Ints and strings (the usual composite key): their hashes can + // neither fail nor run code, so no error scope is needed. + if items + .iter() + .all(|x| matches!(x, Object::Int(_) | Object::Str(_))) + { + let mut hash = TupleHasher::new(); + for item in items.iter() { + hash.push(match item { + Object::Int(i) => py_hash_long_i64(*i), + Object::Str(s) => SharedStr::hash_cached(s), + _ => unreachable!("matched above"), + }); + } + let hash = hash.finish(items.len()); + items.store_hash(hash); + return Some(hash); + } // Hash table callbacks communicate errors through the ambient // scope. Isolate this walk so a failed lane is never cached, // and stop before invoking any later element's hash method. @@ -13632,7 +14066,11 @@ impl Object { /// allocates nothing for them. #[inline] pub fn from_char(ch: char) -> Self { - // (Latin-1 characters come out of `SharedStr::small`'s table.) + // (Latin-1 characters come out of `SharedStr::small`'s table; an + // ASCII one is its table entry by index.) + if ch.is_ascii() { + return Object::Str(SharedStr::ascii_char(ch as u8)); + } Object::Str(SharedStr::from(&*ch.encode_utf8(&mut [0; 4]))) } @@ -13943,6 +14381,7 @@ mod tests { #[test] fn clone_counts_every_layout() { + let _gil = crate::gil::hold_gil(); use crate::object::Object; let tags = [ (Object::None, 0), @@ -13990,6 +14429,7 @@ mod tests { #[test] fn small_int_range_collection_preserves_boundary_values() { + let _gil = crate::gil::hold_gil(); for (start, stop, step, expected) in [ (i64::MAX, i64::MIN, i64::MIN, vec![i64::MAX, -1]), ( @@ -14032,6 +14472,7 @@ mod tests { #[test] fn small_int_range_collection_rejects_impossible_capacities() { + let _gil = crate::gil::hold_gil(); // Neither case can attempt a large allocation: the first fails // length conversion, and the second exceeds Vec's layout limit. for (range, expected) in [ @@ -14099,6 +14540,7 @@ mod tests { #[test] fn truthiness_matches_python_basics() { + let _gil = crate::gil::hold_gil(); assert!(!Object::None.is_truthy()); assert!(!Object::Bool(false).is_truthy()); assert!(Object::Bool(true).is_truthy()); @@ -14123,6 +14565,7 @@ mod tests { #[test] fn identity_of_same_list_handle() { + let _gil = crate::gil::hold_gil(); let a = Object::new_list(vec![Object::Int(1)]); let b = a.clone(); let c = Object::new_list(vec![Object::Int(1)]); @@ -14132,6 +14575,7 @@ mod tests { #[test] fn list_iter_yields_elements_in_order() { + let _gil = crate::gil::hold_gil(); let lst = Object::new_list(vec![Object::Int(1), Object::Int(2), Object::Int(3)]); let mut it = lst.make_iter().expect("iter"); let a = it.next_value().and_then(|x| match x { diff --git a/crates/weavepy-vm/src/pycache.rs b/crates/weavepy-vm/src/pycache.rs index 25743b2b..98c0de93 100644 --- a/crates/weavepy-vm/src/pycache.rs +++ b/crates/weavepy-vm/src/pycache.rs @@ -469,7 +469,7 @@ mod ownership_tests { #[test] fn relocation_preserves_shared_code_and_nested_tuple_constants() { let child = Arc::new(CodeObject { - name: "child".to_owned(), + name: "child".into(), filename: "original.py".into(), ..CodeObject::default() }); diff --git a/crates/weavepy-vm/src/rc.rs b/crates/weavepy-vm/src/rc.rs index 72ab4bf7..23c8ac26 100644 --- a/crates/weavepy-vm/src/rc.rs +++ b/crates/weavepy-vm/src/rc.rs @@ -712,9 +712,35 @@ impl Weak { impl Weak { #[inline] pub fn upgrade(&self) -> Option> { + if refcounts_biased() { + // `Weak::upgrade`'s compare-and-swap loop guards against another + // thread's release racing the increment, which the bias rules + // out. (A dangling handle reads a count of zero.) + if self.0.strong_count() == 0 { + return None; + } + let p = self.0.as_ptr(); + // SAFETY: the payload is live (its strong count is not zero), + // and the new owner accounts for the added reference. + unsafe { + increment_strong(p); + return Some(Self::from_raw_rc(p)); + } + } self.0.upgrade().map(Rc::from_arc) } + /// The [`Rc`] owning the strong reference the caller added for `p`. + /// + /// # Safety + /// + /// As [`Rc::from_raw`]. + #[inline(always)] + unsafe fn from_raw_rc(p: *const T) -> Rc { + // SAFETY: forwarded to the caller. + unsafe { Rc::from_raw(p) } + } + pub fn strong_count(&self) -> usize { self.0.strong_count() } diff --git a/crates/weavepy-vm/src/recursion.rs b/crates/weavepy-vm/src/recursion.rs index 5289976c..80d0b156 100644 --- a/crates/weavepy-vm/src/recursion.rs +++ b/crates/weavepy-vm/src/recursion.rs @@ -160,8 +160,14 @@ pub fn depth_cell() -> *const Cell { #[allow(clippy::not_unsafe_ptr_arg_deref)] #[inline] pub fn enter_with(cell: *const Cell) -> Enter { - let limit = recursion_limit(); - // SAFETY: this thread's own thread-local, alive for the thread. + enter_under(cell, recursion_limit()) +} + +/// [`enter_with`] against `limit` rather than the process-wide limit. +#[inline(always)] +fn enter_under(cell: *const Cell, limit: usize) -> Enter { + // SAFETY: this thread's own thread-local, alive for the thread (see + // `enter_with`). let d = unsafe { &*cell }; let n = d.get() + 1; if n > limit { @@ -231,10 +237,10 @@ mod tests { #[test] fn over_limit_raises_every_time_without_inflating_depth() { - // Use a tiny limit on this thread's view via the global atomic. - // (Tests run single-threaded per #[test] body.) - let saved = recursion_limit(); - RECURSION_LIMIT.store(4, Ordering::Relaxed); + // A tiny limit, for this thread's activations only: the + // process-wide limit is shared with the interpreters other tests + // run concurrently, which a limit of 4 would break. + let enter = || enter_under(depth_cell(), 4); let mut guards = Vec::new(); for _ in 0..4 { @@ -255,6 +261,5 @@ mod tests { drop(guards); assert_eq!(current_depth(), 0); - RECURSION_LIMIT.store(saved, Ordering::Relaxed); } } diff --git a/crates/weavepy-vm/src/seqiter.rs b/crates/weavepy-vm/src/seqiter.rs index ad322e99..2b4866bd 100644 --- a/crates/weavepy-vm/src/seqiter.rs +++ b/crates/weavepy-vm/src/seqiter.rs @@ -17,7 +17,7 @@ use crate::builtin_types::{builtin_types, BuiltinTypes}; use crate::error::{type_error, value_error, RuntimeError}; use crate::object::{BuiltinFn, DictData, DictKey, LazyIterKind, Object, PyIterator, PyLazyIter}; use crate::types::{PyInstance, TypeObject}; -use crate::Interpreter; +use crate::{Interpreter, LeafKind}; /// Which builtin adapter type a class is (or derives from). #[derive(Clone, Copy, PartialEq, Eq)] @@ -96,6 +96,12 @@ fn pure_iter(obj: &Object) -> Option { } } +/// Whether `e` is a `StopIteration` (or a subclass's) being raised. +pub(crate) fn is_stop_iteration(e: &RuntimeError) -> bool { + matches!(e, RuntimeError::PyException(exc) if matches!(&exc.instance, + Object::Instance(i) if i.cls_raw().is_subclass_of(&builtin_types().stop_iteration))) +} + /// `"argument 1"` / `"arguments 1-N"`: the strict-mode mismatch wording. fn arg_range(count: usize) -> String { if count == 1 { @@ -120,8 +126,9 @@ impl Interpreter { self.iter_next(it, globals) } - /// `func(v)` for an adapter's callback: a plain function through - /// the pure-leaf evaluator when it qualifies, else a full call. + /// `func(v)` for an adapter's callback: a pure callback in place (see + /// [`Self::pure_callback`]), a plain function or a method over one + /// bound directly, else a full call. #[inline] pub(crate) fn seq_call1( &mut self, @@ -129,12 +136,18 @@ impl Interpreter { v: Object, globals: &Rc>, ) -> Result { - if let Object::Function(f) = func { - if let Some(r) = self.call_pure_leaf(f, std::slice::from_ref(&v)) { - self.release(v); - return Ok(r); + if let Some(r) = self.pure_callback(func, std::slice::from_ref(&v), true) { + self.release(v); + return Ok(r); + } + match func { + Object::Function(f) => return self.call_python_owned(f, vec![v], Vec::new()), + Object::BoundMethod(bm) if !bm.redispatch_descriptor => { + if let Object::Function(f) = &bm.function { + return self.call_python_owned(f, vec![bm.receiver.clone(), v], Vec::new()); + } } - return self.call_python_owned(f, vec![v], Vec::new()); + _ => {} } let r = self.call(func, std::slice::from_ref(&v), &[], globals); // A dead item's allocation is recycled (a tuple's, as CPython's @@ -169,15 +182,29 @@ impl Interpreter { out.reserve(if filter { n.min(64) } else { n }); } } + // (A callback's `StopIteration` ends the drain, as it ends a step: + // see `Interpreter::lazy_iter_next`.) + let stop = |e: RuntimeError| { + if is_stop_iteration(&e) { + Ok(true) + } else { + Err(e) + } + }; if filter { - while let Some(v) = self.filter_next(&func, &source, globals)? { - out.push(v); + loop { + match self.filter_next(&func, &source, globals) { + Ok(Some(v)) => out.push(v), + Ok(None) => return Ok(true), + Err(e) => return stop(e), + } } - return Ok(true); } while let Some(v) = self.seq_step_source(&source, globals)? { - let r = self.seq_call1(&func, v, globals)?; - out.push(r); + match self.seq_call1(&func, v, globals) { + Ok(r) => out.push(r), + Err(e) => return stop(e), + } } Ok(true) } @@ -893,6 +920,26 @@ pub(crate) fn lazy_pure_next(l: &PyLazyIter) -> Option> { else { return itertools_pure_next(l); }; + // Two plain sequence cursors (`zip(xs, ys)`), the commonest shape. + if let [a, b] = iters.as_slice() { + if let Some((x, y)) = cursor_pair(a, b) { + if let Some(slots) = result + .as_mut() + .and_then(crate::shared_value::ThinArc::get_mut) + .filter(|slots| slots.len() == 2) + { + let old = ( + std::mem::replace(&mut slots[0], x), + std::mem::replace(&mut slots[1], y), + ); + drop(old); + return Some(Some(Object::Tuple(result.clone()?))); + } + let t = crate::object::TupleStorage::from_array([x, y]); + *result = Some(t.clone()); + return Some(Some(Object::Tuple(t))); + } + } if !srcs_ready(iters) { return None; } @@ -937,12 +984,36 @@ pub(crate) fn lazy_pure_pair(l: &PyLazyIter) -> Option<(Object, Object)> { let [a, b] = iters.as_slice() else { return None; }; + if let Some(pair) = cursor_pair(a, b) { + return Some(pair); + } if !srcs_ready(iters) { return None; } Some((src_step(a)?, src_step(b)?)) } +/// The next items of two distinct plain sequence cursors, both taken; `None` +/// (neither taken) unless both have one. +#[inline] +fn cursor_pair(a: &Object, b: &Object) -> Option<(Object, Object)> { + let (Object::Iter(ca), Object::Iter(cb)) = (a, b) else { + return None; + }; + if Rc::ptr_eq(ca, cb) { + return None; + } + // SAFETY: two distinct cells; nothing below runs code, and the views + // end with this call. + let (ia, ib) = unsafe { (ca.peek_mut()?, cb.peek_mut()?) }; + let x = ia.pure_peek()?; + let y = ib.pure_peek()?; + // (`pure_skip` steps past exactly what `pure_peek` found.) + ia.pure_skip(); + ib.pure_skip(); + Some((x, y)) +} + /// The `itertools` state machines that touch no other object (`repeat`, /// `product`, `permutations`, `combinations`, /// `combinations_with_replacement`), stepped under one borrow: `None` @@ -1112,6 +1183,16 @@ pub(crate) fn machine_step(st: &mut LazyIterKind) -> Option> { /// The next item of a native iterator source when taking it runs no /// code and releases nothing (see [`PyIterator::pure_ready`]). fn ready_next(it: &Object) -> Option { + // A plain sequence cursor (`chain(xs, ys)`'s, `islice(xs, n)`'s), in + // one view. + if let Object::Iter(c) = it { + // SAFETY: a step that runs no code; the view ends with this call. + let cur = unsafe { c.peek_mut() }?; + if let Some(v) = cur.pure_peek() { + cur.pure_skip(); + return Some(v); + } + } if !src_ready(it, false) { return None; } @@ -1271,6 +1352,16 @@ pub(crate) fn builtin_ctor_pure(cls: &Rc, args: &[Object]) -> Option _ => None, }; } + // `types.MethodType(func, obj)`: `func` bound to `obj`, as the full + // constructor binds it. + if Rc::ptr_eq(cls, &bt.method_) { + return match args { + [func, obj] => Some(Object::BoundMethod(Rc::new( + crate::object::BoundMethod::py_method(obj.clone(), func.clone()), + ))), + _ => None, + }; + } // `set()`, `dict()`, `list()`, `tuple()`: an empty one (a container // tracked like the builtins' own, unless that would start a collection). if args.is_empty() { @@ -1591,6 +1682,27 @@ pub(crate) fn abs_fast(args: &[Object]) -> Option> })) } +/// `hash(x)` of a value whose hash runs no Python code and can't fail: a +/// native scalar, a `str`, or a tuple of `int`s and `str`s. +pub(crate) fn hash_fast(args: &[Object]) -> Option> { + let [x] = args else { + return None; + }; + let native = match x { + Object::Int(_) | Object::Bool(_) | Object::None | Object::Str(_) => true, + // (A NaN hashes by identity.) + Object::Float(f) => !f.is_nan(), + Object::Tuple(t) => t + .iter() + .all(|e| matches!(e, Object::Int(_) | Object::Str(_))), + _ => false, + }; + if !native { + return None; + } + Some(Ok(Object::Int(crate::object::py_hash_value(x)?))) +} + /// `ord(c)` of a one-character `str`. pub(crate) fn ord_fast(args: &[Object]) -> Option> { let [Object::Str(s)] = args else { @@ -1734,60 +1846,267 @@ fn scalar_truth(v: &Object) -> Option { }) } +/// `a == b` for two `groupby` keys when it is settled natively (identity, +/// two machine ints, strings or floats, two classes that compare by +/// identity): `None` when it could need Python's `__eq__`. +fn native_key_eq(a: &Object, b: &Object) -> Option { + if a.is_same(b) { + return Some(true); + } + Some(match (a, b) { + (Object::Int(x), Object::Int(y)) => x == y, + (Object::Str(x), Object::Str(y)) => { + crate::dictmap::key_bytes_eq(x.as_bytes(), y.as_bytes()) + } + (Object::Float(x), Object::Float(y)) => x == y, + (Object::Bool(x), Object::Bool(y)) => x == y, + (Object::Type(x), Object::Type(y)) + if crate::object::type_hash_is_identity(x) + && crate::object::type_hash_is_identity(y) => + { + Rc::ptr_eq(x, y) + } + _ => return None, + }) +} + +/// The next item of a plain sequence cursor, without taking it (see +/// [`PyIterator::pure_peek`]). +#[inline] +fn cursor_peek(c: &Rc>) -> Option { + // SAFETY: a read that runs no code; the view ends with this call. + unsafe { c.peek() }?.pure_peek() +} + +/// Step past the item [`cursor_peek`] found. +#[inline] +fn cursor_advance(c: &Rc>) -> Option<()> { + // SAFETY: as above; the item was found ready. + unsafe { c.peek_mut() }?.pure_skip().then_some(()) +} + impl Interpreter { - /// [`lazy_pure_next`], and also a `map` or `filter` over a plain - /// sequence cursor whose callback is a warm pure-leaf function - /// (evaluated in place, as the core loop calls one): the item is - /// taken only once the callback has succeeded. `None` (nothing - /// consumed) for every other step. - pub(crate) fn lazy_core_next(&self, l: &PyLazyIter) -> Option> { - if let Some(r) = lazy_pure_next(l) { - return Some(r); + /// `func(*args)` for an adapter's callback when the call runs no Python + /// code: a warm pure-leaf function or a bound method over one (evaluated + /// in place, as the core loop calls one), a registered leaf builtin or a + /// leaf builtin method bound to its receiver, or a builtin type whose + /// native constructor builds the value (`int`, `str`, `type`, ...). + /// `None` leaves the call to the full machinery, nothing having + /// happened (a pure call that would raise declines too, so the full + /// call raises it). Without `effects`, only callbacks with no effect + /// beyond their result qualify (a caller that may yet decline after + /// the call: no `list.append`, `set.pop`, or opaque registered leaf). + pub(crate) fn pure_callback( + &self, + func: &Object, + args: &[Object], + effects: bool, + ) -> Option { + let admit = |kind: LeafKind| -> Option { + let effect = matches!( + kind, + LeafKind::ListAppend + | LeafKind::ListPop + | LeafKind::ListExtend + | LeafKind::ListInsert + | LeafKind::ListReverse + | LeafKind::ListRemove + | LeafKind::SetAdd + | LeafKind::SetDiscard + | LeafKind::SetRemove + | LeafKind::SetPop + | LeafKind::Opaque + | LeafKind::Scalar + | LeafKind::Fast(_) + ); + (effects || !effect).then_some(kind) + }; + match func { + Object::Function(f) => self.call_pure_leaf(f, args), + // (As the core loop's leaf builtin lane admits them: a function, + // or a method bound to its exact builtin receiver.) + Object::Builtin(b) if !b.binds_instance => { + let kind = admit(self.leaf_call_kind(b)?)?; + self.leaf_builtin_call(kind, b, args)?.ok() + } + Object::Type(t) => self.leaf_type_call(t, args), + Object::BoundMethod(bm) if !bm.redispatch_descriptor => match &bm.function { + Object::Function(f) => self.call_pure_leaf_with(f, Some(&bm.receiver), args), + Object::Builtin(b) + if b.binds_instance + && crate::builtins::method_memo_tag(&bm.receiver).is_some() => + { + let kind = admit(self.leaf_call_kind(b)?)?; + let call = match args { + [a] => [bm.receiver.clone(), a.clone()], + _ => return None, + }; + self.leaf_builtin_call(kind, b, &call)?.ok() + } + _ => None, + }, + _ => None, } - // SAFETY: nothing below runs code that could reach the adapter - // (pure leaves call nothing); the view ends with this call. - let st = unsafe { l.state.peek() }?; - let peek = |c: &Rc>| -> Option { - // SAFETY: as above (a distinct cell). - unsafe { c.peek() }?.pure_peek() + } + + /// `groupby_step` when taking the next value and computing its key + /// run no code: the value and its key, the value taken. `None` (nothing + /// consumed) otherwise. + fn groupby_step_pure(&self, source: &Object, keyfunc: &Object) -> Option<(Object, Object)> { + let Object::Iter(c) = source else { + return None; }; - let advance = |c: &Rc>| -> Option<()> { - // SAFETY: as above; the item was found ready. - unsafe { c.peek_mut() }?.next_value().map(drop) + let value = cursor_peek(c)?; + let key = match keyfunc { + Object::None => value.clone(), + f => self.pure_callback(f, std::slice::from_ref(&value), true)?, }; + cursor_advance(c)?; + Some((value, key)) + } + + /// One step of a native adapter that runs no Python code, for every + /// `FOR_ITER` (the core loop's, the frame JIT's, tier 2's) and ahead of + /// the interpreter's general step: [`lazy_pure_next`]'s state machines, + /// and a `map` or `filter` over plain sequence cursors whose callback + /// is pure (see [`Self::pure_callback`]; the item is taken only once + /// the callback has succeeded), an `enumerate` over such an adapter, + /// and a `groupby` or grouper whose key function and key comparisons + /// are native. `None` (nothing consumed, or only whole steps the + /// general path would have taken the same way) for every other step. + pub(crate) fn lazy_core_next(&self, l: &Rc) -> Option> { + // SAFETY: nothing below runs code that could reach the adapter + // (pure callbacks call nothing); the view ends with this call. + let st = unsafe { l.state.peek_mut() }?; match st { - LazyIterKind::Map { - func: Object::Function(f), - iters, - .. - } => { - let [Object::Iter(c)] = iters.as_slice() else { - return None; - }; - let v = peek(c)?; - let r = self.call_pure_leaf(f, std::slice::from_ref(&v))?; - advance(c)?; - Some(Some(r)) - } + LazyIterKind::Map { func, iters, .. } => match iters.as_slice() { + [Object::Iter(c)] => { + let v = cursor_peek(c)?; + let r = self.pure_callback(func, std::slice::from_ref(&v), true)?; + cursor_advance(c)?; + Some(Some(r)) + } + [Object::Iter(a), Object::Iter(b)] if !Rc::ptr_eq(a, b) => { + let args = [cursor_peek(a)?, cursor_peek(b)?]; + let r = self.pure_callback(func, &args, true)?; + cursor_advance(a)?; + cursor_advance(b)?; + Some(Some(r)) + } + _ => None, + }, LazyIterKind::Filter { func, source: Object::Iter(c), } => loop { - let v = peek(c)?; - let keep = match func { + let v = cursor_peek(c)?; + let keep = match &*func { Object::None => scalar_truth(&v)?, Object::Type(t) if Rc::ptr_eq(t, &builtin_types().bool_) => scalar_truth(&v)?, - Object::Function(f) => { - scalar_truth(&self.call_pure_leaf(f, std::slice::from_ref(&v))?)? - } - _ => return None, + // (The truth test may yet decline: no effects.) + f => scalar_truth(&self.pure_callback(f, std::slice::from_ref(&v), false)?)?, }; - advance(c)?; + cursor_advance(c)?; if keep { return Some(Some(v)); } }, - _ => None, + // `enumerate(map(...))` and the like: the source's own pure step. + LazyIterKind::Enumerate { + source: Object::LazyIter(src), + count, + count_big: None, + } if *count < i64::MAX => { + let Some(v) = self.lazy_core_next(src)? else { + return Some(None); + }; + let i = *count; + *count += 1; + Some(Some(Object::new_tuple_array([Object::Int(i), v]))) + } + LazyIterKind::GroupBy { + source, + keyfunc, + tgtkey, + currkey, + currvalue, + currgrouper, + grouper_cls, + } => { + // `groupby_next`: skip to the next group, a whole step at a + // time (a decline midway leaves the state a general step + // would have left). + *currgrouper = None; + loop { + match (&*currkey, &*tgtkey) { + (None, _) => {} + (Some(_), None) => break, + (Some(curr), Some(tgt)) => { + if !native_key_eq(tgt, curr)? { + break; + } + } + } + let (value, key) = self.groupby_step_pure(source, keyfunc)?; + let old = (currkey.replace(key), currvalue.replace(value)); + drop(old); + } + let key = currkey.clone()?; + let old = tgtkey.replace(key.clone()); + let grouper = Rc::new(PyLazyIter { + state: RefCell::new(LazyIterKind::Grouper { + parent: l.clone(), + tgtkey: key.clone(), + }), + cls: grouper_cls.clone(), + }); + *currgrouper = Some(Rc::downgrade(&grouper)); + drop(old); + Some(Some(Object::new_tuple_array([ + key, + Object::LazyIter(grouper), + ]))) + } + LazyIterKind::Grouper { parent, tgtkey } => { + // `_grouper_next`. + // SAFETY: as above (the parent's distinct cell). + let LazyIterKind::GroupBy { + source, + keyfunc, + currkey, + currvalue, + currgrouper, + .. + } = (unsafe { parent.state.peek_mut() })? + else { + return Some(None); + }; + if !currgrouper + .as_ref() + .is_some_and(|w| std::ptr::eq(w.as_ptr(), Rc::as_ptr(l))) + { + return Some(None); + } + if currvalue.is_none() { + let (value, key) = self.groupby_step_pure(source, keyfunc)?; + let old = (currkey.replace(key), currvalue.replace(value)); + drop(old); + } + let Some(curr) = currkey.as_ref() else { + return Some(None); + }; + if !native_key_eq(tgtkey, curr)? { + return Some(None); + } + let value = currvalue.take()?; + let old = currkey.take(); + drop(old); + Some(Some(value)) + } + // A `filter` or `enumerate` over a source only the + // interpreter can step. + LazyIterKind::Filter { .. } | LazyIterKind::Enumerate { .. } => None, + _ => lazy_pure_next(l), } } } diff --git a/crates/weavepy-vm/src/shared_value.rs b/crates/weavepy-vm/src/shared_value.rs index 007a4e43..560f73b2 100644 --- a/crates/weavepy-vm/src/shared_value.rs +++ b/crates/weavepy-vm/src/shared_value.rs @@ -245,6 +245,19 @@ impl ThinWeak { pub fn upgrade(&self) -> Option> { self.weak_view().upgrade().map(ThinArc::from_arc) } + + /// A strong handle on the payload that owns no reference of its own. + /// + /// # Safety + /// + /// The payload must be alive, and stay so while the view is used; the + /// view must never be dropped (it owns no reference to release). + pub(crate) unsafe fn borrowed_arc(&self) -> ManuallyDrop> { + ManuallyDrop::new(ThinArc { + data: self.data, + ownership: PhantomData, + }) + } pub fn strong_count(&self) -> usize { self.weak_view().strong_count() } @@ -615,6 +628,12 @@ impl SharedStr { storage.hash.store(h, Ordering::Relaxed); h } + /// The memoised `hash(s)` if it has been computed. + #[inline] + pub fn known_hash(this: &Self) -> Option { + let h = this.0.storage().hash.load(Ordering::Relaxed); + (h != -1).then_some(h) + } /// `len(s)` in code points, memoised in the string itself. #[inline] pub fn char_count(this: &Self) -> usize { @@ -831,6 +850,27 @@ impl SharedStr { } } +impl SharedStr { + /// The text as an owned `String`, copied directly. The blanket + /// `ToString` would run it through `Display` and `Formatter::pad`, + /// several times the work for the same result (no width is set); + /// as an inherent method this one is what `s.to_string()` calls. + #[inline] + #[allow(clippy::inherent_to_string_shadow_display)] + pub fn to_string(&self) -> String { + String::from(&**self) + } +} + +impl SharedStr { + /// The shared one-character string of ASCII byte `c` (below `0x80`). + #[inline] + pub fn ascii_char(c: u8) -> Self { + debug_assert!(c.is_ascii()); + small_table()[usize::from(c & 0x7f)].clone() + } +} + /// [`SharedStr::small`]'s strings: the 256 Latin-1 characters by code /// point, then the empty string. fn small_table() -> &'static [SharedStr; 257] { diff --git a/crates/weavepy-vm/src/specialize.rs b/crates/weavepy-vm/src/specialize.rs index 0a7c9a07..ee5bafbf 100644 --- a/crates/weavepy-vm/src/specialize.rs +++ b/crates/weavepy-vm/src/specialize.rs @@ -223,7 +223,7 @@ pub fn attempt_specialize_load_attr(obj: &Object, name: &str) -> InlineCache { /// /// The fast path takes advantage of two facts: /// -/// 1. The `IndexMap` underneath `DictData` exposes O(1) lookup +/// 1. The table underneath `DictData` exposes O(1) lookup /// by integer index once we know the slot. So caching the /// slot index lets us skip the hash lookup. /// 2. Builtins and globals are stable across dispatches in steady @@ -503,7 +503,8 @@ pub fn attempt_specialize_call(callable: &Object, argc: usize) -> InlineCache { } /// The `CallPyKwNames` permutation nibble of a keyword a `**kwargs` -/// callee collects into its dict (parameter slots stay below 15 there). +/// callee collects into its dict. Its consumers read it without checking +/// the callee, so no parameter slot may be 15 (see [`kw_perm`]). pub const KW_TO_VARKW: u32 = 0xF; /// Decide on a `CALL_KW` specialization (RFC 0069 WS3): a plain Python @@ -513,7 +514,7 @@ pub const KW_TO_VARKW: u32 = 0xF; /// positional count, and every slot left uncovered is filled by a /// trailing default. The kw→slot permutation packs 4 bits per keyword /// into `perm`; anything that doesn't fit (more than 8 keywords, more -/// than 16 parameter slots) stays generic. Binder *errors* (multiple +/// than 15 parameter slots) stays generic. Binder *errors* (multiple /// values, unexpected keyword, posonly-as-keyword, missing arguments) /// all fail these checks, so the generic binder keeps owning the /// error messages. @@ -521,37 +522,101 @@ pub fn attempt_specialize_call_kw( f: &Rc, argc: usize, kw_names: &[(String, crate::object::Object)], +) -> InlineCache { + specialize_call_kw_by(f, argc, kw_names.iter().map(|(n, _)| n.as_str())) +} + +/// [`attempt_specialize_call_kw`] for keyword names that are the call +/// site's own `str` objects (the core loop's `CALL_KW` lane). +pub fn attempt_specialize_call_kw_names( + f: &Rc, + argc: usize, + names: &[crate::object::Object], +) -> InlineCache { + if !names + .iter() + .all(|n| matches!(n, crate::object::Object::Str(_))) + { + return InlineCache::Cooldown(COOLDOWN); + } + specialize_call_kw_by( + f, + argc, + names.iter().map(|n| match n { + crate::object::Object::Str(s) => &**s, + _ => "", + }), + ) +} + +fn specialize_call_kw_by<'a>( + f: &Rc, + argc: usize, + names: impl ExactSizeIterator, ) -> InlineCache { let code = f.code(); - // Positional parameters, then the keyword-only ones. - let npos = code.arg_count as usize; - let total = npos + code.kwonly_count as usize; - let kwc = kw_names.len(); if code.is_generator || code.is_coroutine || code.is_async_generator - || code.has_varargs || !(code.cellvars.is_empty() && code.freevars.is_empty() && f.closure.is_empty()) + { + return InlineCache::Cooldown(COOLDOWN); + } + let kwc = names.len(); + match kw_perm(f, &code, argc, names) { + Some((perm, _)) => InlineCache::CallPyKwNames { + func_id: rc_id(f), + perm, + argc: argc as u8, + kwc: kwc as u8, + }, + None => InlineCache::Cooldown(COOLDOWN), + } +} + +/// The `CallPyKwNames` permutation of a keyword call of `f` (whose code is +/// `code`) with `argc` positionals (a receiver included) and the keyword +/// `names`, and the parameter slots the call fills: each keyword's slot in +/// 4 bits (`KW_TO_VARKW` for one a `**kwargs` callee collects). Each name +/// is tried first at the parameter its position gives it. `None` for any +/// call the generic binder must take: `*args`, more than 8 keywords or 15 +/// parameter slots, replaced defaults, a keyword without a distinct +/// keyword-bindable parameter (or `**kwargs`), a parameter left without a +/// default. +pub fn kw_perm<'a>( + f: &Rc, + code: &weavepy_compiler::CodeObject, + argc: usize, + names: impl ExactSizeIterator, +) -> Option<(u32, u32)> { + // Positional parameters, then the keyword-only ones. + let npos = code.arg_count as usize; + let total = npos + code.kwonly_count as usize; + let kwc = names.len(); + if code.has_varargs || (f.defaults_maybe_overridden() && (f.slot("__defaults__").is_some() || f.slot("__kwdefaults__").is_some())) - || total > 16 - // A `**kwargs` callee reserves nibble 15 for the keywords it - // collects (see `KW_TO_VARKW`), and its dict slot follows the - // parameters. - || (code.has_varkeywords && (total > 15 || code.varnames.len() <= total)) + // Nibble 15 is `KW_TO_VARKW`, which the binders take as "into + // the `**kwargs` dict" for any callee: slot 15 can't be encoded. + || total > 15 + // A `**kwargs` callee's dict slot follows the parameters. + || (code.has_varkeywords && code.varnames.len() <= total) || kwc == 0 || kwc > 8 || argc > npos { - return InlineCache::Cooldown(COOLDOWN); + return None; } let mut perm: u32 = 0; let mut covered: u32 = (1u32 << argc) - 1; - for (j, (name, _)) in kw_names.iter().enumerate() { - let bindable = code.varnames[..total] - .iter() - .position(|v| v == name) - .filter(|&slot| slot >= code.posonly_count as usize); + for (j, name) in names.enumerate() { + let at = argc + j; + let bindable = if at < total && code.varnames[at] == name { + Some(at) + } else { + code.varnames[..total].iter().position(|v| v == name) + } + .filter(|&slot| slot >= code.posonly_count as usize); let slot = match bindable { Some(slot) => slot, // No keyword-bindable parameter of that name (a @@ -561,23 +626,17 @@ pub fn attempt_specialize_call_kw( perm |= KW_TO_VARKW << (4 * j); continue; } - None => return InlineCache::Cooldown(COOLDOWN), + None => return None, }; - if covered & (1 << slot) != 0 { - return InlineCache::Cooldown(COOLDOWN); + // Nibble 15 means "collected by `**kwargs`" (see `KW_TO_VARKW`): + // a keyword can't name the sixteenth parameter slot. + if covered & (1 << slot) != 0 || slot as u32 == KW_TO_VARKW { + return None; } perm |= (slot as u32) << (4 * j); covered |= 1 << slot; } - if !kw_uncovered_have_defaults(f, &code, covered) { - return InlineCache::Cooldown(COOLDOWN); - } - InlineCache::CallPyKwNames { - func_id: rc_id(f), - perm, - argc: argc as u8, - kwc: kwc as u8, - } + kw_uncovered_have_defaults(f, code, covered).then_some((perm, covered)) } /// Every parameter slot `covered` leaves unbound carries a default: @@ -599,7 +658,7 @@ pub fn kw_uncovered_have_defaults( covered & (1 << slot) != 0 || f.kw_defaults .iter() - .any(|(n, _)| Some(n.as_str()) == code.varnames.get(slot).map(String::as_str)) + .any(|(n, _)| Some(n.as_str()) == code.varnames.get(slot).map(|n| n.as_str())) }) } @@ -658,7 +717,9 @@ pub fn native_fn_id(b: &Rc) -> u64 { /// would invalidate the simple "dict slot" fast path. We bail out /// of LOAD_ATTR / STORE_ATTR specialization for these. pub(crate) fn type_has_attr_override(ty: &Rc) -> bool { - if ty.lookup("__getattr__").is_some() { + // A `super` proxy resolves attributes along its target's MRO (CPython's + // `super_getattro`), never its own class's. + if ty.lookup("__getattr__").is_some() || ty.is_super_proxy_type() { return true; } // `object.__getattribute__` lives in `object`'s dict as a sentinel, so a @@ -997,6 +1058,7 @@ mod tests { #[test] fn subscr_decisions_cover_ws3_shapes() { + let _gil = crate::gil::hold_gil(); let xs = Object::new_list(vec![Object::Int(1)]); let idx = Object::Int(0); assert_eq!( @@ -1033,6 +1095,7 @@ mod tests { #[test] fn store_subscr_decisions_cover_ws3_shapes() { + let _gil = crate::gil::hold_gil(); let xs = Object::new_list(vec![Object::Int(1)]); let idx = Object::Int(0); assert_eq!( @@ -1053,6 +1116,7 @@ mod tests { #[test] fn for_iter_str_and_dict_specialize() { + let _gil = crate::gil::hold_gil(); let s_iter = Object::Iter(Rc::new(RefCell::new(PyIterator::Str { s: crate::shared_value::SharedStr::from("abc"), index: 0, diff --git a/crates/weavepy-vm/src/stdlib/asyncio_events.rs b/crates/weavepy-vm/src/stdlib/asyncio_events.rs index 452679db..64c234ca 100644 --- a/crates/weavepy-vm/src/stdlib/asyncio_events.rs +++ b/crates/weavepy-vm/src/stdlib/asyncio_events.rs @@ -198,44 +198,96 @@ fn install_handle(args: &[Object]) -> Result { // --------------------------------------------------------------------- // BaseEventLoop.call_soon. -/// The Python hashes of the instance attributes the fast paths read. +/// A name the fast paths look up: its Python hash, and where an instance +/// of the loop class last held it (see [`crate::inst_dict::PosMemo`]). +struct AttrName { + name: &'static str, + hash: i64, + memo: crate::inst_dict::PosMemo, +} + +impl AttrName { + fn new(name: &'static str) -> Self { + Self { + name, + hash: crate::object::py_str_hash(name), + memo: crate::inst_dict::PosMemo::new(), + } + } +} + +/// The instance attributes the fast paths read, and the module globals +/// they check. struct Names { - debug: i64, - closed: i64, - ready: i64, - call_soon: i64, - get_debug: i64, - task_factory: i64, + debug: AttrName, + closed: AttrName, + ready: AttrName, + call_soon: AttrName, + get_debug: AttrName, + task_factory: AttrName, + events: AttrName, + handle: AttrName, + tasks: AttrName, + task: AttrName, + futures: AttrName, + future: AttrName, } fn names() -> &'static Names { static NAMES: std::sync::OnceLock = std::sync::OnceLock::new(); NAMES.get_or_init(|| Names { - debug: crate::object::py_str_hash("_debug"), - closed: crate::object::py_str_hash("_closed"), - ready: crate::object::py_str_hash("_ready"), - call_soon: crate::object::py_str_hash("call_soon"), - get_debug: crate::object::py_str_hash("get_debug"), - task_factory: crate::object::py_str_hash("_task_factory"), + debug: AttrName::new("_debug"), + closed: AttrName::new("_closed"), + ready: AttrName::new("_ready"), + call_soon: AttrName::new("call_soon"), + get_debug: AttrName::new("get_debug"), + task_factory: AttrName::new("_task_factory"), + events: AttrName::new("events"), + handle: AttrName::new("Handle"), + tasks: AttrName::new("tasks"), + task: AttrName::new("Task"), + futures: AttrName::new("futures"), + future: AttrName::new("Future"), }) } -/// Instance attribute `name` (Python hash `hash`), read without running -/// code (a split layout answers a never-set name from its filter). -fn inst_attr(inst: &PyInstance, name: &str, hash: i64) -> Option { +/// `f` of instance attribute `n`, read without running code (a split +/// layout answers a never-set name from its filter, and a set one from +/// the position it last had). +#[inline] +fn inst_attr_with(inst: &PyInstance, n: &AttrName, f: impl FnOnce(Option<&Object>) -> R) -> R { match inst.dict.published() { - Some(d) => d - .borrow() - .get(&crate::object::StrKeyHashed { s: name, hash }) - .cloned(), + Some(d) => f(d.borrow().get(&crate::object::StrKeyHashed { + s: n.name, + hash: n.hash, + })), None => { + // SAFETY: a read that runs no code; the view ends with `f`, + // which only inspects or clones the value. + if let Some(split) = unsafe { inst.dict.split_peek() } { + return f(split.get_memo(n.name, n.hash, &n.memo)); + } let split = inst.dict.split_cell().borrow(); - let i = split.position_hashed(name, hash)?; - split.values().get(i).cloned() + f(split.get_memo(n.name, n.hash, &n.memo)) } } } +/// Instance attribute `n` (see [`inst_attr_with`]). +fn inst_attr(inst: &PyInstance, n: &AttrName) -> Option { + inst_attr_with(inst, n, |v| v.cloned()) +} + +/// Whether instance attribute `n` is unset. +fn inst_attr_unset(inst: &PyInstance, n: &AttrName) -> bool { + inst_attr_with(inst, n, |v| v.is_none()) +} + +/// Whether instance attribute `n` is `False`. +fn inst_attr_false(inst: &PyInstance, n: &AttrName) -> bool { + inst_attr_with(inst, n, |v| matches!(v, Some(Object::Bool(false)))) +} + /// A class (by address and attribute version, which no other class /// state ever reuses) a check below already approved on this thread. type Verified = std::cell::Cell<(usize, u64)>; @@ -271,7 +323,7 @@ fn resolves_to(cls: &TypeObject, name: &str, expected: &Object) -> bool { /// The `_ready` deque of a stock loop, if its `append` is the native one. fn ready_deque(inst: &PyInstance) -> Option { - let ready = inst_attr(inst, "_ready", names().ready)?; + let ready = inst_attr(inst, &names().ready)?; let Object::Instance(r) = &ready else { return None; }; @@ -304,8 +356,9 @@ fn fast_call_soon( // The class the loop's module would build (`events.Handle`, looked up // at call time: it may have been replaced, or come from another // import of `asyncio.events` than the one `hs` describes). - let current = global_module_attr(&ls.globals, "events", "Handle") - .is_some_and(|h| matches!(h, Object::Type(t) if Rc::ptr_eq(&t, &hs.cls))); + let current = + global_module_type_ptr(&ls.globals, &names().events, &names().handle, &HANDLE_MEMO) + == Rc::as_ptr(&hs.cls) as usize; if !current { return Ok(None); } @@ -364,7 +417,7 @@ pub(crate) fn call_soon( ls.call_soon_native .get() .is_some_and(|n| resolves_to(&li.cls(), "call_soon", n)) - }) && inst_attr(li, "call_soon", names().call_soon).is_none(); + }) && inst_attr_unset(li, &names().call_soon); if native { if let Some(h) = fast_call_soon(ls, loop_, &cb, cb_args, &ctx)? { return Ok(h); @@ -391,9 +444,9 @@ pub(crate) fn get_debug(loop_: &Object) -> Result { if let (Some(ls), Object::Instance(li)) = (&ls, loop_) { let native = verified(&NATIVE_GET_DEBUG, &li.class.borrow(), || { resolves_to(&li.cls(), "get_debug", &ls.get_debug) - }) && inst_attr(li, "get_debug", names().get_debug).is_none(); + }) && inst_attr_unset(li, &names().get_debug); if native { - if let Some(Object::Bool(b)) = inst_attr(li, "_debug", names().debug) { + if let Some(Object::Bool(b)) = inst_attr(li, &names().debug) { return Ok(b); } } @@ -418,25 +471,87 @@ fn plain_loop(ls: &LoopState, loop_: &Object) -> bool { }); let n = names(); stock - && matches!(inst_attr(li, "_debug", n.debug), Some(Object::Bool(false))) - && matches!( - inst_attr(li, "_closed", n.closed), - Some(Object::Bool(false)) - ) - && inst_attr(li, "get_debug", n.get_debug).is_none() + && inst_attr_false(li, &n.debug) + && inst_attr_false(li, &n.closed) + && inst_attr_unset(li, &n.get_debug) +} + +/// Where [`global_module_type_ptr`] last found its class: the globals +/// dict's address and mutation stamp, the module dict's, the global +/// value epoch, and the class's address. +type ModuleAttrMemo = std::cell::Cell<(usize, u64, usize, u64, u64, usize)>; + +thread_local! { + static HANDLE_MEMO: ModuleAttrMemo = const { std::cell::Cell::new((0, 0, 0, 0, 0, 0)) }; + static TASK_MEMO: ModuleAttrMemo = const { std::cell::Cell::new((0, 0, 0, 0, 0, 0)) }; + static FUTURE_MEMO: ModuleAttrMemo = const { std::cell::Cell::new((0, 0, 0, 0, 0, 0)) }; } -/// `module.attr`, for the module bound to global `module` in `globals`. -fn global_module_attr(globals: &Rc>, module: &str, attr: &str) -> Option { - let m = globals +/// The address of the class `module.attr` is, for the module bound to +/// global `module` in `globals` (`0` for anything else), remembered in +/// `memo` with the states of the two dicts it read: +/// while neither changed (every store to a dict draws it a new stamp, and +/// a global rebound in place moves the value epoch), the module the +/// globals bind is the same one and binds the same class, so the answer +/// stands without either probe. +fn global_module_type_ptr( + globals: &Rc>, + module: &AttrName, + attr: &AttrName, + memo: &'static std::thread::LocalKey, +) -> usize { + let epoch = crate::object::global_value_epoch(); + let gptr = Rc::as_ptr(globals) as usize; + let Ok(g) = globals.try_borrow() else { + return 0; + }; + let gstamp = g.mutation_stamp(); + drop(g); + let (mg, mgs, mm, mms, me, found) = memo.with(std::cell::Cell::get); + if mg == gptr && mgs == gstamp && me == epoch && mm != 0 { + // SAFETY: the globals are as they were, so they still bind the + // module that owns this dict, which they keep alive. + let mdict = unsafe { &*(mm as *const RefCell) }; + if mdict.try_borrow().is_ok_and(|d| d.mutation_stamp() == mms) { + return found; + } + } + let Some(Object::Module(m)) = globals .borrow() - .get(&crate::object::StrKey(module)) - .cloned()?; - let Object::Module(m) = m else { - return None; + .get(&crate::object::StrKeyHashed { + s: module.name, + hash: module.hash, + }) + .cloned() + else { + return 0; }; - let v = m.dict.borrow().get(&crate::object::StrKey(attr)).cloned(); - v + let v = m + .dict + .borrow() + .get(&crate::object::StrKeyHashed { + s: attr.name, + hash: attr.hash, + }) + .cloned(); + let found = match &v { + Some(Object::Type(t)) => Rc::as_ptr(t) as usize, + _ => 0, + }; + if found != 0 { + let mstamp = m.dict.borrow().mutation_stamp(); + memo.with(|c| { + c.set(( + gptr, + gstamp, + Rc::as_ptr(&m.dict) as usize, + mstamp, + epoch, + found, + )); + }); + } + found } /// `BaseEventLoop.create_task(self, coro, **kwargs)`. @@ -453,12 +568,10 @@ fn loop_create_task_method( let Object::Instance(li) = loop_ else { unreachable!("plain_loop checks for an instance") }; - let no_factory = matches!( - inst_attr(li, "_task_factory", names().task_factory), - Some(Object::None) - ); - let native = global_module_attr(&ls.globals, "tasks", "Task") - .is_some_and(|t| crate::stdlib::asyncio_mod::is_task_class(&t)); + let no_factory = matches!(inst_attr(li, &names().task_factory), Some(Object::None)); + let native = + global_module_type_ptr(&ls.globals, &names().tasks, &names().task, &TASK_MEMO) + == crate::stdlib::asyncio_mod::task_class_addr(); if no_factory && native { return crate::stdlib::asyncio_mod::new_task(loop_, coro.clone(), kwargs); } @@ -470,8 +583,9 @@ fn loop_create_task_method( /// `BaseEventLoop.create_future(self)`. fn loop_create_future_method(ls: &LoopState, args: &[Object]) -> Result { if let [loop_] = args { - let native = global_module_attr(&ls.globals, "futures", "Future") - .is_some_and(|f| crate::stdlib::asyncio_mod::is_future_class(&f)); + let native = + global_module_type_ptr(&ls.globals, &names().futures, &names().future, &FUTURE_MEMO) + == crate::stdlib::asyncio_mod::future_class_addr(); // (Not in debug mode: there the Python method's frame shows in // the future's `_source_traceback`.) if native && plain_loop(ls, loop_) { diff --git a/crates/weavepy-vm/src/stdlib/asyncio_mod.rs b/crates/weavepy-vm/src/stdlib/asyncio_mod.rs index 2d0f4144..a3d41e05 100644 --- a/crates/weavepy-vm/src/stdlib/asyncio_mod.rs +++ b/crates/weavepy-vm/src/stdlib/asyncio_mod.rs @@ -462,10 +462,16 @@ fn handle_key() -> &'static str { /// The registry handle stored on `inst`, if a state is attached. #[inline] fn handle_of(inst: &PyInstance) -> Option { - match inst.slots.try_borrow().ok()?.get_hinted(0, handle_key()) { + let read = |slots: &crate::types::SlotStorage| match slots.get_hinted(0, handle_key()) { Some(Object::Int(h)) => Some(*h), _ => None, + }; + // SAFETY: a read of one slot that runs no code. + if let Some(slots) = unsafe { inst.slots.peek() } { + return read(slots); } + let slots = inst.slots.try_borrow().ok()?; + read(&slots) } /// The already-attached state cell of a Future/Task instance, without @@ -510,7 +516,12 @@ fn state_of_obj(obj: &Object) -> Result>, RuntimeError> { /// or a Python subclass of either). fn is_native_future(obj: &Object) -> bool { match obj { - Object::Instance(inst) => inst.cls().is_subclass_of(&future_class()), + Object::Instance(inst) => { + if is_exact_native(obj) { + return true; + } + inst.cls().is_subclass_of(future_class_ref()) + } _ => false, } } @@ -631,6 +642,19 @@ fn fut_gc_matches(obj: &Object) -> bool { } } +/// [`fut_gc_matches`]'s cheap superset for the traverse hook, which every +/// instance a collection walks is offered: an instance with slot storage +/// (a future's handle lives in a slot). [`fut_gc_traverse`] finds the +/// state itself, so the precise lookup runs once. +fn fut_gc_may_match(obj: &Object) -> bool { + match obj { + // SAFETY: a read that runs no code. (A borrowed cell answers + // "maybe".) + Object::Instance(i) => unsafe { i.slots.peek() }.is_none_or(|s| !s.is_empty_default()), + _ => false, + } +} + fn fut_gc_traverse(obj: &Object, visit: &mut dyn FnMut(&Object)) { let Object::Instance(inst) = obj else { return }; let Some(st) = existing_state_of(inst) else { @@ -718,8 +742,9 @@ fn fut_gc_clear(obj: &Object) { fn register_gc_hooks() { static ONCE: std::sync::Once = std::sync::Once::new(); ONCE.call_once(|| { - crate::gc_trace::register_traverse(fut_gc_matches, fut_gc_traverse); - crate::gc_trace::register_clear(fut_gc_matches, fut_gc_clear); + let kind = crate::gc_trace::hook_kind::INSTANCE; + crate::gc_trace::register_traverse_for(kind, fut_gc_may_match, fut_gc_traverse); + crate::gc_trace::register_clear_for(kind, fut_gc_matches, fut_gc_clear); }); } @@ -1604,6 +1629,10 @@ fn fi_mark_done(inst: &PyInstance) { } fn future_iter_class() -> Rc { + future_iter_class_ref().clone() +} + +fn future_iter_class_ref() -> &'static Rc { static CELL: std::sync::OnceLock> = std::sync::OnceLock::new(); CELL.get_or_init(|| { let bt = crate::builtin_types::builtin_types(); @@ -1635,7 +1664,6 @@ fn future_iter_class() -> Rc { TypeObject::new_user("FutureIter", vec![bt.object_.clone()], dict) .expect("FutureIter class must linearise") }) - .clone() } fn future_iter_new(fut: &Object) -> Object { @@ -1693,6 +1721,92 @@ fn fi_send(args: &[Object]) -> Result { fi_next(&args[..1]) } +/// How [`future_iter_send`] stepped a `FutureIter`. +pub(crate) enum FutureIterStep { + /// The pending future, yielded to the task driving the `await`. + Yield(Object), + /// The finished future's result: the `await`'s value. + Return(Object), +} + +/// A `SEND` (of any value, which a `FutureIter` ignores) to `it`, when it +/// is a native `FutureIter` over a pending future, or over a future that +/// finished with a result: [`fi_next`]'s step, the result returned without +/// the `StopIteration` that carries it there (CPython's `am_send`). +/// `None` for anything else (the general `SEND` raises what's owed), +/// touching nothing. Runs no Python code. +pub(crate) fn future_iter_send(it: &Object) -> Option { + let Object::Instance(inst) = it else { + return None; + }; + if !std::ptr::eq(inst.cls_raw(), Rc::as_ptr(future_iter_class_ref())) { + return None; + } + let fut = fi_future(inst); + let Object::Instance(fut_inst) = &fut else { + return None; + }; + let st = existing_state_of(fut_inst)?; + let status = st.try_borrow().ok()?.status; + match status { + FutStatus::Pending => { + let mut s = st.try_borrow_mut().ok()?; + if s.blocking { + return None; + } + s.blocking = true; + drop(s); + Some(FutureIterStep::Yield(fut)) + } + FutStatus::Finished => { + let result = { + let mut s = st.try_borrow_mut().ok()?; + if !matches!(s.exception(), Object::None) { + return None; + } + s.log_traceback = false; + s.result.clone() + }; + fi_mark_done(inst); + Some(FutureIterStep::Return(result)) + } + FutStatus::Cancelled => None, + } +} + +/// `await fut`'s iterator, when `obj` is an instance whose class's +/// `__await__` is the native `Future`'s or `Task`'s (a `FutureIter`, as +/// [`fut_await`] makes it); `None` for anything else. +pub(crate) fn native_future_await(obj: &Object) -> Option { + thread_local! { + /// The last class found to resolve `__await__` natively, and its + /// attribute version then. + static NATIVE_AWAIT: std::cell::Cell<(usize, u64)> = const { std::cell::Cell::new((0, 0)) }; + } + let Object::Instance(inst) = obj else { + return None; + }; + let cls = inst.cls_raw(); + let key = (std::ptr::from_ref(cls) as usize, cls.attr_version.get()); + if NATIVE_AWAIT.with(std::cell::Cell::get) != key { + let native = |c: &Rc| { + c.dict + .try_borrow() + .ok() + .and_then(|d| d.get(&crate::object::StrKey("__await__")).cloned()) + }; + let found = cls.lookup("__await__"); + let ok = matches!(&found, Some(Object::Builtin(b)) if [future_class_ref(), task_class_ref()] + .into_iter() + .any(|c| matches!(native(c), Some(Object::Builtin(n)) if Rc::ptr_eq(&n, b)))); + if !ok { + return None; + } + NATIVE_AWAIT.with(|c| c.set(key)); + } + Some(future_iter_new(obj)) +} + fn fi_throw(args: &[Object]) -> Result { let inst = fi_self(args)?; let interp = interp()?; @@ -2193,6 +2307,19 @@ fn task_step_handle_result( } Ok(()) } + // A bare `yield` (`asyncio.sleep(0)`) reschedules, as the C Task + // checks before looking for the future protocol (`None` has no + // `_asyncio_future_blocking`, so the order is unobservable, and + // the failed lookup built an `AttributeError` each time). + SendOutcome::Yield(Object::None) => { + call_soon( + loop_, + task_step_callable(task.clone()), + &[], + context.clone(), + )?; + Ok(()) + } SendOutcome::Yield(result) => { // The coroutine suspended, yielding `result`. let blocking_attr = interp @@ -2253,15 +2380,6 @@ fn task_step_handle_result( ); schedule_step_with_exc(interp, task, loop_, context, new_exc) } - } else if matches!(result, Object::None) { - // Bare `yield` — reschedule. - call_soon( - loop_, - task_step_callable(task.clone()), - &[], - context.clone(), - )?; - Ok(()) } else if matches!(result, Object::Generator(_)) { let t = py_repr(interp, task); let r = py_repr(interp, &result); @@ -2619,14 +2737,14 @@ fn install_getset( .insert(DictKey(Object::from_static(name)), prop); } -/// Whether `obj` is the native `Future` class itself. -pub(crate) fn is_future_class(obj: &Object) -> bool { - matches!(obj, Object::Type(t) if Rc::ptr_eq(t, future_class_ref())) +/// The native `Task` class's address. +pub(crate) fn task_class_addr() -> usize { + Rc::as_ptr(task_class_ref()) as usize } -/// Whether `obj` is the native `Task` class itself. -pub(crate) fn is_task_class(obj: &Object) -> bool { - matches!(obj, Object::Type(t) if Rc::ptr_eq(t, task_class_ref())) +/// The native `Future` class's address. +pub(crate) fn future_class_addr() -> usize { + Rc::as_ptr(future_class_ref()) as usize } /// A tracked, uninitialized instance of the native class `cls`. diff --git a/crates/weavepy-vm/src/stdlib/collections_native.rs b/crates/weavepy-vm/src/stdlib/collections_native.rs index 729a508e..f1bcf3e8 100644 --- a/crates/weavepy-vm/src/stdlib/collections_native.rs +++ b/crates/weavepy-vm/src/stdlib/collections_native.rs @@ -1172,6 +1172,46 @@ fn chainmap_getitem(args: &[Object]) -> Result { interp.call_object(missing, std::slice::from_ref(key), &[]) } +/// The class cache key for "the class has no `maps` attribute" (see +/// `Interpreter::class_lacks`). +static MAPS_CLASS_KEY: u8 = 0; + +/// A ChainMap instance's own `maps` list, read without running code: the +/// name's hash computed once, and its position in a split layout +/// remembered (see [`crate::inst_dict::PosMemo`]). +fn chainmap_maps_of(inst: &crate::types::PyInstance) -> Option>>> { + struct MapsName { + hash: i64, + memo: crate::inst_dict::PosMemo, + } + static NAME: std::sync::OnceLock = std::sync::OnceLock::new(); + let n = NAME.get_or_init(|| MapsName { + hash: crate::object::py_str_hash("maps"), + memo: crate::inst_dict::PosMemo::new(), + }); + let v = match inst.dict.published() { + Some(d) => d + .try_borrow() + .ok()? + .get(&crate::object::StrKeyHashed { + s: "maps", + hash: n.hash, + }) + .cloned(), + None => inst + .dict + .split_cell() + .try_borrow() + .ok()? + .get_memo("maps", n.hash, &n.memo) + .cloned(), + }; + match v? { + Object::List(l) => Some(l), + _ => None, + } +} + /// [`chainmap_getitem`]'s leaf half (see `leaf_builtins::Fast`): a plain /// key found by exact native equality in a list of exact dicts held in /// the instance's own `maps` attribute. A key no map holds (the @@ -1180,12 +1220,18 @@ fn chainmap_getitem_leaf(args: &[Object]) -> Option let [Object::Instance(inst), key] = args else { return None; }; - if crate::object::exotic_str_keys_possible() || inst.cls_raw().lookup("maps").is_some() { + // (The class's answer is cached on it under its version, and the + // instance's slot for the name remembered; see `chainmap_maps_of`.) + if crate::object::exotic_str_keys_possible() + || !crate::Interpreter::class_lacks( + inst.cls_raw(), + std::ptr::addr_of!(MAPS_CLASS_KEY) as usize, + "maps", + ) + { return None; } - let Object::List(maps) = inst.attr_get_str("maps")? else { - return None; - }; + let maps = chainmap_maps_of(inst)?; let probe = crate::object::LeafProbe::new(key)?; let maps = maps.try_borrow().ok()?; for mapping in maps.iter() { @@ -1420,22 +1466,25 @@ fn tally_one( if let Some(probe) = crate::object::LeafProbe::new(key) { if !crate::capi_watchers::dicts_active() { if let Ok(mut m) = d.try_borrow_mut() { - match m.get_mut(&probe) { - Some(Object::Int(n)) if *n < i64::MAX => { - *n += 1; - drop(m); - crate::object::dict_mutation_event(d); - return Ok(()); + match m.probe_entry(&probe) { + crate::dictmap::ProbeEntry::Occupied(e) => { + if let Object::Int(n) = e.into_mut() { + if *n < i64::MAX { + *n += 1; + drop(m); + crate::object::dict_mutation_event(d); + return Ok(()); + } + } } - Some(_) => {} - None if probe.miss_is_exact() => { - m.insert(DictKey(key.clone()), Object::Int(1)); + crate::dictmap::ProbeEntry::Vacant(e) if probe.miss_is_exact() => { + e.insert(DictKey(key.clone()), Object::Int(1)); drop(m); crate::object::dict_watch_bump(d); crate::object::dict_mutation_event(d); return Ok(()); } - None => {} + crate::dictmap::ProbeEntry::Vacant(_) => {} } } } diff --git a/crates/weavepy-vm/src/stdlib/collections_odict.rs b/crates/weavepy-vm/src/stdlib/collections_odict.rs index 5e3ccbae..984de777 100644 --- a/crates/weavepy-vm/src/stdlib/collections_odict.rs +++ b/crates/weavepy-vm/src/stdlib/collections_odict.rs @@ -6,7 +6,7 @@ //! CPython's C `odict` keeps a linked list of nodes next to its dict: a //! second, keys-only dict in a hidden slot (see [`order_of`]). The order //! dict is insertion-ordered like every WeavePy dict, so appending a key, -//! moving one (`IndexMap::move_index`), and removing one are its own +//! moving one (`DictMap::move_index`), and removing one are its own //! operations. Values are always read from the payload by key, so a //! payload changed behind the order's back (`dict.__delitem__(od, k)`) //! surfaces as a `KeyError` on the next ordered read, as it does in @@ -249,33 +249,36 @@ fn od_setitem_leaf(args: &[Object]) -> Option> { let probe = crate::object::LeafProbe::new(key)?; let mut m = main.try_borrow_mut().ok()?; let mut o = order.try_borrow_mut().ok()?; - let in_main = m.get_index_of(&probe); - let in_order = o.get_index_of(&probe).is_some(); - if (in_main.is_none() || !in_order) && !probe.miss_is_exact() { + // One probe of each finds the entry or the slot a new key takes. + use crate::dictmap::ProbeEntry; + let in_main = m.probe_entry(&probe); + let in_order = o.probe_entry(&probe); + let (main_new, order_new) = ( + matches!(in_main, ProbeEntry::Vacant(_)), + matches!(in_order, ProbeEntry::Vacant(_)), + ); + if (main_new || order_new) && !probe.miss_is_exact() { return None; } let old = match in_main { - Some(i) => { - let (_, slot) = m.get_index_mut(i)?; - Some(std::mem::replace(slot, value.clone())) - } - None => { - m.insert(DictKey(key.clone()), value.clone()); + ProbeEntry::Occupied(e) => Some(std::mem::replace(e.into_mut(), value.clone())), + ProbeEntry::Vacant(e) => { + e.insert(DictKey(key.clone()), value.clone()); None } }; - if !in_order { - o.insert(DictKey(key.clone()), Object::None); + if let ProbeEntry::Vacant(e) = in_order { + e.insert(DictKey(key.clone()), Object::None); } drop((m, o)); let changed = old.as_ref().is_none_or(|o| !o.is_same(value)); - if in_main.is_none() { + if main_new { crate::object::dict_watch_bump(main); } if changed { crate::object::dict_mutation_event(main); } - if !in_order { + if order_new { crate::object::dict_watch_bump(&order); } drop(old); diff --git a/crates/weavepy-vm/src/stdlib/elementtree_native.rs b/crates/weavepy-vm/src/stdlib/elementtree_native.rs index 83e70e27..67c0f659 100644 --- a/crates/weavepy-vm/src/stdlib/elementtree_native.rs +++ b/crates/weavepy-vm/src/stdlib/elementtree_native.rs @@ -1630,7 +1630,7 @@ const EP_ITERFIND: usize = 3; /// The closure `f` holds for free variable `name`, when it is a `str`. fn closure_str( f: &crate::object::PyFunction, - freevars: &[String], + freevars: &[weavepy_compiler::Name], name: &str, ) -> Option { let i = freevars.iter().position(|v| v == name)?; @@ -1741,14 +1741,12 @@ struct PathKey<'a> { exotic: std::cell::Cell, } -impl std::hash::Hash for PathKey<'_> { - fn hash(&self, state: &mut H) { - self.hash.hash(state); +impl crate::dictmap::Probe for PathKey<'_> { + fn probe_hash(&self) -> i64 { + self.hash } -} -impl indexmap::Equivalent for PathKey<'_> { - fn equivalent(&self, key: &DictKey) -> bool { + fn probe_eq(&self, key: &DictKey) -> bool { match &key.0 { Object::Tuple(t) => { let mut items = t.iter(); diff --git a/crates/weavepy-vm/src/stdlib/faulthandler_mod.rs b/crates/weavepy-vm/src/stdlib/faulthandler_mod.rs index 45191fb9..b66808b1 100644 --- a/crates/weavepy-vm/src/stdlib/faulthandler_mod.rs +++ b/crates/weavepy-vm/src/stdlib/faulthandler_mod.rs @@ -67,7 +67,7 @@ static WATCHDOG_GEN: AtomicU64 = AtomicU64::new(0); struct RegisteredThread { ident: u64, frame_stack: crate::object::FrameStack, - exc_info_stack: Rc>>, + exc_info_stack: Rc>>, } /// Registration order == thread creation order; CPython's @@ -79,7 +79,7 @@ static THREADS: Mutex> = Mutex::new(Vec::new()); pub fn note_thread_start( ident: u64, frame_stack: crate::object::FrameStack, - exc_info_stack: Rc>>, + exc_info_stack: Rc>>, ) { let mut g = THREADS.lock().unwrap(); if g.iter().any(|t| t.ident == ident) { @@ -97,11 +97,7 @@ pub fn note_thread_start( /// `sys._current_exceptions()`. Safe to materialize under the GIL: /// peer threads are parked, exactly as during a faulthandler dump. #[allow(clippy::type_complexity)] -pub fn thread_snapshots() -> Vec<( - u64, - crate::object::FrameStack, - Rc>>, -)> { +pub fn thread_snapshots() -> Vec<(u64, crate::object::FrameStack, Rc>>)> { THREADS .lock() .unwrap() diff --git a/crates/weavepy-vm/src/stdlib/functools_mod.rs b/crates/weavepy-vm/src/stdlib/functools_mod.rs index 219f5684..3361449f 100644 --- a/crates/weavepy-vm/src/stdlib/functools_mod.rs +++ b/crates/weavepy-vm/src/stdlib/functools_mod.rs @@ -496,10 +496,32 @@ impl LruField { } } - /// Whether `key` names this field. + /// The interned name every wrapper's dictionary is built with. + #[inline] + fn key(self) -> &'static crate::shared_value::SharedStr { + static KEYS: std::sync::OnceLock<[crate::shared_value::SharedStr; 7]> = + std::sync::OnceLock::new(); + &KEYS.get_or_init(|| { + LruField::ALL.map( + |field| match crate::stdlib::sys::intern_name(field.name()) { + Object::Str(s) => s, + _ => unreachable!("interned names are strs"), + }, + ) + })[self as usize] + } + + /// The field's key, for a new entry. + fn key_object(self) -> DictKey { + DictKey(Object::Str(self.key().clone())) + } + + /// Whether `key` names this field: the interned name itself (one + /// compare), or an equal string. #[inline] fn is(self, key: &DictKey) -> bool { - matches!(&key.0, Object::Str(s) if name_eq(s, self.name())) + matches!(&key.0, Object::Str(s) + if crate::shared_value::SharedStr::ptr_eq(s, self.key()) || name_eq(s, self.name())) } } @@ -541,7 +563,7 @@ fn lru_set(inst: &crate::types::PyInstance, field: LruField, v: Object) { match lru_slot_mut(&mut dict, field) { Some(slot) => *slot = v, None => { - dict.insert(DictKey(Object::from_static(field.name())), v); + dict.insert(field.key_object(), v); } } } @@ -578,7 +600,7 @@ fn lru_cache_wrapper_new(args: &[Object]) -> Result { { let mut dict = inst.dict_cell().borrow_mut(); for (field, value) in LruField::ALL.into_iter().zip(values) { - dict.insert(DictKey(Object::from_static(field.name())), value); + dict.insert(field.key_object(), value); } } // CPython's `lru_cache_new` GC-tracks the wrapper: its `__wrapped__` @@ -623,12 +645,17 @@ fn lru_make_key(call_args: &[Object], kwargs: &[(String, Object)], typed: bool) fn lru_counter_bump(inst: &crate::types::PyInstance, field: LruField) { // Keep the read and increment under one lock. Separate get/set borrows // lose updates when multiple threads hit a shared cache under gil=0. - let mut dict = inst.dict_cell().borrow_mut(); - match lru_slot_mut(&mut dict, field) { + lru_bump(&mut inst.dict_cell().borrow_mut(), field); +} + +/// Count one more of the counter `field` in the wrapper's `dict`. +#[inline] +fn lru_bump(dict: &mut DictData, field: LruField) { + match lru_slot_mut(dict, field) { Some(Object::Int(n)) => *n += 1, Some(count) => *count = Object::Int(1), None => { - dict.insert(DictKey(Object::from_static(field.name())), Object::Int(1)); + dict.insert(field.key_object(), Object::Int(1)); } } } @@ -741,11 +768,11 @@ fn lru_state_links(state: &Object) -> Option<&Rc>>> { } } -fn lru_mode(dict: &DictData) -> Result<(bool, bool), RuntimeError> { +fn lru_mode(state: Option<&Object>) -> Result<(bool, bool), RuntimeError> { // Read the tag without cloning active recency storage. The caller // releases its borrow before hashing the key or calling the wrapped // function. - match lru_slot(dict, LruField::State) { + match state { Some(Object::Bool(true)) => Ok((true, false)), Some(Object::Int(1)) => Ok((true, true)), Some(state @ Object::Tuple(_)) => { @@ -768,10 +795,7 @@ fn scalar_lru_links( ) -> Result>>>, RuntimeError> { let mut dict = inst.dict_cell().borrow_mut(); if lru_slot(&dict, LruField::State).is_none() { - dict.insert( - DictKey(Object::from_static(LruField::State.name())), - Object::Bool(false), - ); + dict.insert(LruField::State.key_object(), Object::Bool(false)); } let Some(state) = lru_slot_mut(&mut dict, LruField::State) else { unreachable!("just inserted") @@ -863,14 +887,31 @@ fn scalar_lru_operation( note_scalar_lru_event(2); return Ok(ScalarLru::Slow); } - // Deferral also protects against private-cache tampering: a foreign - // key must not invoke Python inside the paired borrow. - let (found, deferred) = - crate::object::key_cmp_deferred(|| data.get_index_of(&DictKey(key.clone()))); - let found = found?; - if deferred { - return Err(invalid_lru_order()); - } + // A `str` or `int` key settles by native equality in one probe; + // its hash is kept for the insert below. + let probe = crate::object::LeafProbe::new(key); + let exact = match &probe { + Some(p) => match data.get_index_of(p) { + Some(i) => Some(Some(i)), + None if p.miss_is_exact() => Some(None), + None => None, + }, + None => None, + }; + let (found, exact_miss) = match exact { + Some(found) => (found, found.is_none()), + None => { + // Deferral also protects against private-cache tampering: a + // foreign key must not invoke Python inside the paired borrow. + let (found, deferred) = + crate::object::key_cmp_deferred(|| data.get_index_of(&DictKey(key.clone()))); + let found = found?; + if deferred { + return Err(invalid_lru_order()); + } + (found, false) + } + }; if let Some(index) = found { let (stored, value) = data.get_index(index).ok_or_else(invalid_lru_order)?; if !native_lru_key(&stored.0) { @@ -903,7 +944,15 @@ fn scalar_lru_operation( } else { None }; - data.insert(DictKey(key.clone()), value.clone()); + match &probe { + // Proven absent above (an eviction keeps it so): no second probe. + Some(p) if exact_miss => { + data.insert_unique_hashed(p.hash, DictKey(key.clone()), value.clone()); + } + _ => { + data.insert(DictKey(key.clone()), value.clone()); + } + } order.push(limit).ok_or_else(invalid_lru_order)?; } // Publish a consistent cache before releasing an evicted result. @@ -911,20 +960,115 @@ fn scalar_lru_operation( Ok(ScalarLru::Complete(None)) } +/// What [`lru_fast_lookup`] settled. +enum FastLookup { + /// The cached value, its hit counted and its recency refreshed. + Hit(Object), + /// An exact miss, counted: the wrapped function to call (`None` if the + /// wrapper lost it). + Miss(Option), +} + +/// The lookup of a native `key` in a bounded cache whose recency links are +/// live, under one hold of the cache and its links: the hit or the counted +/// miss, or `None` (nothing touched) for the general path to settle. +#[inline] +fn lru_fast_lookup( + inst: &crate::types::PyInstance, + cache: &RefCell, + links: &RefCell>, + probe: &crate::object::LeafProbe<'_>, +) -> Option { + // The cache lock also serializes the links and the counters under + // gil=0 (taken in the order `lru_cache_clear` takes them). Nothing + // here runs Python. + let data = cache.borrow_mut(); + let mut bytes = links.borrow_mut(); + if bytes.is_empty() { + return None; + } + let mut order = lru_order::Order::new(&mut bytes, data.len())?; + match data.get_index_of(probe) { + Some(index) => { + let (stored, value) = data.get_index(index)?; + if !native_lru_key(&stored.0) { + return None; + } + order.touch(index)?; + let value = value.clone(); + lru_bump(&mut inst.dict_cell().borrow_mut(), LruField::Hits); + Some(FastLookup::Hit(value)) + } + None if probe.miss_is_exact() => { + let mut dict = inst.dict_cell().borrow_mut(); + lru_bump(&mut dict, LruField::Misses); + Some(FastLookup::Miss( + lru_slot(&dict, LruField::Wrapped).cloned(), + )) + } + None => None, + } +} + +/// Store `result` under the native `key` after [`lru_fast_lookup`]'s miss, +/// evicting the least recent entry of a full cache in place: `Some` with +/// the evicted entry (to release once the cache is consistent and +/// unborrowed) when stored or already present, `None` (nothing touched) +/// for the general path. +fn lru_fast_store( + cache: &RefCell, + links: &Rc>>, + key: &Object, + result: &Object, + limit: usize, +) -> Result>, RuntimeError> { + let Some(probe) = crate::object::LeafProbe::new(key) else { + return Ok(None); + }; + let mut data = cache.borrow_mut(); + let mut bytes = links.borrow_mut(); + let len = data.len(); + if bytes.is_empty() || len > limit { + return Ok(None); + } + let Some(mut order) = lru_order::Order::new(&mut bytes, len) else { + return Ok(None); + }; + match data.get_index_of(&probe) { + // A recursive call populated the key: its entry and recency win. + Some(_) => return Ok(Some(None)), + None if !probe.miss_is_exact() => return Ok(None), + None => {} + } + if len == limit { + // The least recent entry's place takes the new one, which becomes + // the most recent. + let Some(head) = order.head() else { + return Ok(None); + }; + if order.touch(head).is_none() { + return Err(invalid_lru_order()); + } + let evicted = + data.replace_index_unique(head, probe.hash, DictKey(key.clone()), result.clone()); + return Ok(Some(evicted)); + } + crate::object::bytearray_check_resizable(links)?; + if order.push(limit).is_none() { + return Err(invalid_lru_order()); + } + data.insert_unique_hashed(probe.hash, DictKey(key.clone()), result.clone()); + Ok(Some(None)) +} + fn lru_call(args: &[Object], kwargs: &[(String, Object)]) -> Result { let _depth_guard = lru_enter_native()?; - let inst = lru_self(args)?; - let Some(ptr) = crate::vm_singletons::current_interpreter_ptr() else { - return Err(type_error("lru_cache requires a running interpreter")); - }; - // SAFETY: published by the enclosing VM frame on this thread. - let interp = unsafe { &mut *ptr }; - let func = || { - lru_get(&inst, LruField::Wrapped) - .ok_or_else(|| type_error("lru_cache wrapper lost its function")) + let Some(Object::Instance(inst)) = args.first() else { + return Err(type_error("expected _lru_cache_wrapper instance")); }; - // One borrow reads the size, the mode, and the cache. - let (maxsize, mode, cache) = { + let call_args = &args[1..]; + // One borrow reads the size, the mode, the cache, and live links. + let (maxsize, mode, cache, links) = { let dict = inst.dict_cell().borrow(); let cache = match lru_slot(&dict, LruField::Cache) { Some(Object::Dict(cache)) => Some(cache.clone()), @@ -933,19 +1077,59 @@ fn lru_call(args: &[Object], kwargs: &[(String, Object)]) -> Result Ok(unsafe { &mut *ptr }), + None => Err(type_error("lru_cache requires a running interpreter")), + }; + let func = || { + lru_get(inst, LruField::Wrapped) + .ok_or_else(|| type_error("lru_cache wrapper lost its function")) }; - let call_args = &args[1..]; - let globals = interp.builtins_dict(); // maxsize == 0: no caching, statistics only. if matches!(maxsize, Object::Int(0)) { - lru_counter_bump(&inst, LruField::Misses); + let interp = interp()?; + lru_counter_bump(inst, LruField::Misses); + let globals = interp.builtins_dict(); return interp.call(&func()?, call_args, kwargs, &globals); } let (typed, scalar_enabled) = mode?; let key = lru_make_key(call_args, kwargs, typed); + // The warm shape: an `int`, `str`, or tuple of them in a bounded cache + // whose recency links are live. + if let (Object::Int(limit @ 1..), Some(cache), Some(links), true) = + (&maxsize, &cache, &links, scalar_enabled) + { + let probe = native_lru_key(&key) + .then(|| crate::object::LeafProbe::new(&key)) + .flatten(); + let found = probe.and_then(|p| lru_fast_lookup(inst, cache, links, &p)); + match found { + Some(FastLookup::Hit(v)) => return Ok(v), + Some(FastLookup::Miss(func)) => { + let func = func.ok_or_else(|| type_error("lru_cache wrapper lost its function"))?; + let interp = interp()?; + let globals = interp.builtins_dict(); + let result = interp.call(&func, call_args, kwargs, &globals)?; + let limit = usize::try_from(*limit).unwrap_or(usize::MAX); + if let Some(evicted) = lru_fast_store(cache, links, &key, &result, limit)? { + // Released with the cache consistent and unborrowed. + drop(evicted); + return Ok(result); + } + return lru_store(inst, cache, &key, result, &maxsize, true); + } + None => {} + } + } + let interp = interp()?; + let globals = interp.builtins_dict(); // Compute a tuple key's hash before touching the cache. Successful // hashes are retained by the tuple, so lookup, recency updates, and // insertion invoke each argument's hash only once per call. Errors @@ -960,7 +1144,7 @@ fn lru_call(args: &[Object], kwargs: &[(String, Object)]) -> Result 0); let scalar_hit = if bounded && scalar_enabled { - scalar_lru_operation(&inst, &cache, &key, None)? + scalar_lru_operation(inst, &cache, &key, None)? } else { ScalarLru::Slow }; @@ -987,30 +1171,43 @@ fn lru_call(args: &[Object], kwargs: &[(String, Object)]) -> Result>, + key: &Object, + result: Object, + maxsize: &Object, + scalar: bool, +) -> Result { if scalar { - let Object::Int(limit) = maxsize else { + let Object::Int(limit) = *maxsize else { unreachable!() }; let limit = usize::try_from(limit).unwrap_or(usize::MAX); if matches!( - scalar_lru_operation(&inst, &cache, &key, Some((&result, limit)))?, + scalar_lru_operation(inst, cache, key, Some((&result, limit)))?, ScalarLru::Complete(_) ) { return Ok(result); } } crate::object::key_cmp_scope(|| { - with_stolen_cache(&cache, |c| { + with_stolen_cache(cache, |c| { // A reentrant call may have populated the key while `func` ran; // keep the existing entry (CPython does the same). if !c.contains_key(&DictKey(key.clone())) { c.insert(DictKey(key.clone()), result.clone()); - if let Object::Int(m) = maxsize { + if let Object::Int(m) = *maxsize { while c.len() > m.max(0) as usize { c.shift_remove_index(0); } diff --git a/crates/weavepy-vm/src/stdlib/functools_mod/lru_order.rs b/crates/weavepy-vm/src/stdlib/functools_mod/lru_order.rs index 1db4651c..59fbc038 100644 --- a/crates/weavepy-vm/src/stdlib/functools_mod/lru_order.rs +++ b/crates/weavepy-vm/src/stdlib/functools_mod/lru_order.rs @@ -20,14 +20,18 @@ pub(super) fn empty() -> Vec { pub(super) struct Order<'a> { bytes: &'a mut Vec, len: usize, + /// The words the buffer holds: the header's two and two per node. + words: usize, } impl<'a> Order<'a> { + #[inline] pub(super) fn new(bytes: &'a mut Vec, len: usize) -> Option { - if bytes.len() != len.checked_add(1)?.checked_mul(2 * WORD)? { + let words = len.checked_add(1)?.checked_mul(2)?; + if bytes.len() != words.checked_mul(WORD)? { return None; } - let order = Self { bytes, len }; + let order = Self { bytes, len, words }; let head = order.word(HEAD)?; let tail = order.word(TAIL)?; if (len == 0 && (head != NONE || tail != NONE)) @@ -38,24 +42,41 @@ impl<'a> Order<'a> { Some(order) } + #[inline(always)] fn word(&self, index: usize) -> Option { - let start = index.checked_mul(WORD)?; - Some(usize::from_ne_bytes( + if index >= self.words { + return None; + } + // SAFETY: the buffer holds `words` whole words (checked by `new`, + // kept by `push` and `swap_remove`); the read is unaligned. + #[allow(clippy::cast_ptr_alignment)] + Some(unsafe { self.bytes - .get(start..start.checked_add(WORD)?)? - .try_into() - .ok()?, - )) + .as_ptr() + .cast::() + .add(index) + .read_unaligned() + }) } + #[inline(always)] fn set_word(&mut self, index: usize, value: usize) -> Option<()> { - let start = index.checked_mul(WORD)?; - self.bytes - .get_mut(start..start.checked_add(WORD)?)? - .copy_from_slice(&value.to_ne_bytes()); + if index >= self.words { + return None; + } + // SAFETY: as in `word`; the write is unaligned. + #[allow(clippy::cast_ptr_alignment)] + unsafe { + self.bytes + .as_mut_ptr() + .cast::() + .add(index) + .write_unaligned(value); + } Some(()) } + #[inline(always)] fn node(&self, index: usize) -> Option<(usize, usize)> { if index >= self.len { return None; @@ -63,6 +84,7 @@ impl<'a> Order<'a> { Some((self.word(2 + 2 * index)?, self.word(3 + 2 * index)?)) } + #[inline] fn detach(&mut self, index: usize) -> Option<()> { let (prev, next) = self.node(index)?; if prev == index || next == index { @@ -93,6 +115,7 @@ impl<'a> Order<'a> { (head != NONE).then_some(head) } + #[inline] pub(super) fn touch(&mut self, index: usize) -> Option<()> { if index >= self.len { return None; @@ -127,6 +150,7 @@ impl<'a> Order<'a> { self.bytes.extend_from_slice(&tail.to_ne_bytes()); self.bytes.extend_from_slice(&NONE.to_ne_bytes()); self.len += 1; + self.words += 2; if tail == NONE { self.set_word(HEAD, index)?; } else { @@ -162,7 +186,8 @@ impl<'a> Order<'a> { } } self.len -= 1; - self.bytes.truncate((self.len + 1) * 2 * WORD); + self.words -= 2; + self.bytes.truncate(self.words * WORD); Some(()) } diff --git a/crates/weavepy-vm/src/stdlib/gc_real.rs b/crates/weavepy-vm/src/stdlib/gc_real.rs index 67e47ec0..968de450 100644 --- a/crates/weavepy-vm/src/stdlib/gc_real.rs +++ b/crates/weavepy-vm/src/stdlib/gc_real.rs @@ -402,7 +402,7 @@ fn referrer_edges(obj: &Object, visit: &mut dyn FnMut(&Object)) { // stack rather than in the generator's state box. Object::Generator(g) | Object::Coroutine(g) | Object::AsyncGenerator(g) if matches!( - g.state.try_borrow().as_deref(), + g.state().try_borrow().as_deref(), Ok(crate::object::GeneratorState::Running) ) => { @@ -457,7 +457,7 @@ fn find_paths_dbg(args: &[Object]) -> Result { out.push(Object::from_str(p.join(" -> "))); continue; } - if gc_trace::is_tracked(cid) || !seen.insert(cid) { + if gc_trace::is_tracked(&child) || !seen.insert(cid) { continue; } let mut p = path.clone(); @@ -504,28 +504,30 @@ fn object_is_tracked(target: &Object) -> bool { // answers as CPython's (always tracked) and is tracked from here on. Object::Instance(inst) => { inst.ensure_gc_tracked(); - gc_trace::with_state(|s| s.is_tracked_instance(id_of(target))) + gc_trace::with_state(|s| s.is_tracked_instance(target)) } - // A function, generator or coroutine may still be young. + // A function, generator or coroutine may still be young. A + // coroutine whose tracking is deferred (see + // `PyGenerator::track_deferred`) answers as CPython's and is + // tracked from here on. Object::Function(_) | Object::Generator(_) | Object::Coroutine(_) => { - gc_trace::with_state(|s| s.is_tracked_instance(id_of(target))) + if let Object::Generator(g) | Object::Coroutine(g) = target { + if g.track_deferred.replace(false) { + gc_trace::track_generator(target); + } + } + gc_trace::with_state(|s| s.is_tracked_instance(target)) } // A list/dict/set born holding only scalars has its tracking // deferred; CPython tracks it from birth, so answer as CPython // does and hand it to the collector from here on. - Object::List(_) | Object::Dict(_) | Object::Set(_) => { - let id = id_of(target); - gc_trace::with_state(|s| { - if !s.is_tracked_instance(id) { - s.track_now(target); - } - s.is_tracked_instance(id) - }) - } - other => { - let id = id_of(other); - gc_trace::with_state(|s| s.is_tracked(id)) - } + Object::List(_) | Object::Dict(_) | Object::Set(_) => gc_trace::with_state(|s| { + if !s.is_tracked_instance(target) { + s.track_now(target); + } + s.is_tracked_instance(target) + }), + other => gc_trace::with_state(|s| s.is_tracked_obj(other)), } } @@ -596,8 +598,7 @@ fn track_obj(args: &[Object]) -> Result { fn untrack_obj(args: &[Object]) -> Result { if let Some(o) = args.first() { - let id = id_of(o); - gc_trace::with_state(|s| s.untrack_id(id)); + gc_trace::untrack(o); } Ok(Object::None) } diff --git a/crates/weavepy-vm/src/stdlib/greenlet_native.rs b/crates/weavepy-vm/src/stdlib/greenlet_native.rs index 5551ae75..1cea68e7 100644 --- a/crates/weavepy-vm/src/stdlib/greenlet_native.rs +++ b/crates/weavepy-vm/src/stdlib/greenlet_native.rs @@ -143,7 +143,7 @@ struct GreenletBody { /// whenever the greenlet is delivered to. frames: crate::object::FrameStack, /// This greenlet's own handled-exception stack. - exc_info: Rc>>, + exc_info: Rc>>, /// `recursion::DEPTH` snapshot while parked. saved_depth: Cell, /// `gr_context` while not running (`None` = fresh implicit context; @@ -280,12 +280,16 @@ fn chain_contains(id: u64) -> bool { /// bounds, which are meaningless while running on a greenlet's own /// mmap'd stack, so those probes must fall back to their counted /// budgets here. +#[inline] pub fn on_greenlet_stack() -> bool { // Nothing has ever created a greenlet: skip the thread-local reads // (this is polled on every lean Python call). - if !GREENLETS_EVER.load(Ordering::Relaxed) { - return false; - } + GREENLETS_EVER.load(Ordering::Relaxed) && on_greenlet_stack_slow() +} + +#[cold] +#[inline(never)] +fn on_greenlet_stack_slow() -> bool { let main = MAIN_ID.with(|m| m.get()); main != 0 && CURRENT.with(|c| c.get()) != main } diff --git a/crates/weavepy-vm/src/stdlib/marshal_mod.rs b/crates/weavepy-vm/src/stdlib/marshal_mod.rs index c0215949..b9018d4c 100644 --- a/crates/weavepy-vm/src/stdlib/marshal_mod.rs +++ b/crates/weavepy-vm/src/stdlib/marshal_mod.rs @@ -1184,11 +1184,16 @@ impl Scan { // Names never pass through the compiler's constant cache, so an // equal string *constant* keeps its own object: the canonical // constant is not decided here, only the identifier set. - for name in co.names.iter().chain(cp.localsplusnames.iter()) { - self.identifiers.insert(name.clone()); + for name in co + .names + .iter() + .map(|n| n.as_str()) + .chain(cp.localsplusnames.iter().map(String::as_str)) + { + self.identifiers.insert(name.to_owned()); } - self.identifiers.insert(co.name.clone()); - self.qualnames_done.insert(co.qualname.clone()); + self.identifiers.insert(co.name.to_string()); + self.qualnames_done.insert(co.qualname.to_string()); } /// Strings nested in tuple/frozenset constants: plain literals, @@ -1258,8 +1263,8 @@ fn bigint_to_15bit(b: &BigInt) -> (i32, Vec) { } /// Build a `marshal` tuple of interned-string objects. -fn strs_to_tuple(items: &[String]) -> Object { - Object::new_tuple(items.iter().map(|s| Object::from_str(s.clone())).collect()) +fn strs_to_tuple>(items: &[S]) -> Object { + Object::new_tuple(items.iter().map(|s| Object::from_str(s.as_ref())).collect()) } // ---------- reader ---------- @@ -1733,18 +1738,33 @@ impl<'a> MarshalReader<'a> { // (test_capi.test_eval_code_ex test_custom_locals). let is_class_body = flags & CO_OPTIMIZED == 0 && co_name != ""; let mut co = CodeObject { - name: co_name, - qualname: co_qualname, + name: co_name.into(), + qualname: co_qualname.into(), filename: string_of(&filename, "co_filename")?.into(), caches: CacheTable::with_len(decoded.instructions.len()), vm_ext: weavepy_compiler::VmExt::default(), jit_hint: weavepy_compiler::JitHint::default(), instructions: decoded.instructions, constants, - names: tuple_of_strings(&names, "co_names")?, - varnames: decoded.varnames, - freevars: decoded.freevars, - cellvars: decoded.cellvars, + names: tuple_of_strings(&names, "co_names")? + .iter() + .map(weavepy_compiler::Name::from) + .collect(), + varnames: decoded + .varnames + .iter() + .map(weavepy_compiler::Name::from) + .collect(), + freevars: decoded + .freevars + .iter() + .map(weavepy_compiler::Name::from) + .collect(), + cellvars: decoded + .cellvars + .iter() + .map(weavepy_compiler::Name::from) + .collect(), exception_table: decoded.exception_table, linetable: decoded.linetable.into(), // PEP-657 columns recovered from long-form location entries diff --git a/crates/weavepy-vm/src/stdlib/math.rs b/crates/weavepy-vm/src/stdlib/math.rs index 851c26ec..43cc7d85 100644 --- a/crates/weavepy-vm/src/stdlib/math.rs +++ b/crates/weavepy-vm/src/stdlib/math.rs @@ -978,15 +978,90 @@ fn libm_fmod(x: f64, y: f64) -> f64 { } fn math_gcd(args: &[Object]) -> Result { - use num_integer::Integer; + // Machine-word arguments, the common call: a binary GCD of their + // magnitudes (`gcd(i64::MIN, 0)` is 2**63, past `i64`). + let small = |o: &Object| match o { + Object::Int(i) => Some(i.unsigned_abs()), + Object::Bool(b) => Some(u64::from(*b)), + _ => None, + }; + if let Some(words) = args.iter().map(small).collect::>>() { + let g = words + .into_iter() + .fold(0u64, |a, b| gcd_u128(u128::from(a), u128::from(b)) as u64); + return Ok(i64::try_from(g).map_or_else( + |_| Object::int_from_bigint(num_bigint::BigInt::from(g)), + Object::Int, + )); + } let mut acc = num_bigint::BigInt::from(0); for a in args { let v = index_bigint(a)?; - acc = acc.gcd(&v); // num_integer::gcd is always non-negative + acc = gcd_bigint(&acc, &v); } Ok(Object::int_from_bigint(acc)) } +/// Binary GCD of two machine words. +fn gcd_u128(mut a: u128, mut b: u128) -> u128 { + if a == 0 { + return b; + } + if b == 0 { + return a; + } + let shift = (a | b).trailing_zeros(); + a >>= a.trailing_zeros(); + loop { + b >>= b.trailing_zeros(); + if a > b { + std::mem::swap(&mut a, &mut b); + } + b -= a; + if b == 0 { + return a << shift; + } + } +} + +/// The non-negative GCD of two integers (`num_integer`'s answer), with +/// the shapes `fractions` and `statistics` produce settled cheaply: a +/// power-of-two factor (every float's ratio has a power-of-two +/// denominator), magnitudes that fit 128 bits, and one small operand +/// (a single remainder reduces the other to a word). +pub(crate) fn gcd_bigint(a: &num_bigint::BigInt, b: &num_bigint::BigInt) -> num_bigint::BigInt { + use num_bigint::{BigInt, BigUint}; + use num_integer::Integer; + use num_traits::{ToPrimitive, Zero}; + let (a, b) = (a.magnitude(), b.magnitude()); + if a.is_zero() { + return BigInt::from(b.clone()); + } + if b.is_zero() { + return BigInt::from(a.clone()); + } + let (za, zb) = ( + a.trailing_zeros().unwrap_or(0), + b.trailing_zeros().unwrap_or(0), + ); + let shift = za.min(zb); + let (a, b) = (a >> za, b >> zb); + let odd = if a == BigUint::from(1u8) || b == BigUint::from(1u8) { + BigUint::from(1u8) + } else if let (Some(x), Some(y)) = (a.to_u128(), b.to_u128()) { + BigUint::from(gcd_u128(x, y)) + } else if let Some(y) = b.to_u64() { + let r = (&a % y).to_u64().expect("a remainder below a word"); + BigUint::from(gcd_u128(u128::from(r), u128::from(y))) + } else if let Some(x) = a.to_u64() { + let r = (&b % x).to_u64().expect("a remainder below a word"); + BigUint::from(gcd_u128(u128::from(r), u128::from(x))) + } else { + a.gcd(&b) + }; + BigInt::from(odd << shift) +} + fn math_lcm(args: &[Object]) -> Result { use num_integer::Integer; use num_traits::{Signed, Zero}; diff --git a/crates/weavepy-vm/src/stdlib/multiprocessing_mod.rs b/crates/weavepy-vm/src/stdlib/multiprocessing_mod.rs index c240c91a..3c5744b4 100644 --- a/crates/weavepy-vm/src/stdlib/multiprocessing_mod.rs +++ b/crates/weavepy-vm/src/stdlib/multiprocessing_mod.rs @@ -599,6 +599,7 @@ fn make_semlock_instance(inner: Arc) -> Object { finalize_ran: crate::sync::Cell::new(false), deferred: crate::sync::Cell::new(false), c_body: crate::types::CBody::default(), + gc_slot: crate::gc_trace::GcSlot::new(), }); Object::Instance(inst) } @@ -1232,6 +1233,7 @@ fn nt_make_semlock_instance(inner: &Arc) -> Object { finalize_ran: crate::sync::Cell::new(false), deferred: crate::sync::Cell::new(false), c_body: crate::types::CBody::default(), + gc_slot: crate::gc_trace::GcSlot::new(), }); Object::Instance(inst) } diff --git a/crates/weavepy-vm/src/stdlib/os.rs b/crates/weavepy-vm/src/stdlib/os.rs index 76c3870d..6263f082 100644 --- a/crates/weavepy-vm/src/stdlib/os.rs +++ b/crates/weavepy-vm/src/stdlib/os.rs @@ -201,6 +201,24 @@ pub fn build(cache: &ModuleCache) -> Rc { crate::leaf_builtins::register(f); } d.insert(DictKey(Object::from_static("getpid")), getpid); + // CPython's C accelerators for `posixpath.splitroot` and + // `posixpath.normpath`, which `posixpath` imports when present + // (`pathlib` splits every path it parses through `splitroot`). + #[cfg(not(windows))] + for (name, body, fast) in [ + ( + "_path_splitroot_ex", + os_path_splitroot_ex as fn(&[Object]) -> Result, + path_splitroot_fast as crate::leaf_builtins::Fast, + ), + ("_path_normpath", os_path_normpath, path_normpath_fast), + ] { + let f = builtin(name, body); + if let Object::Builtin(b) = &f { + crate::leaf_builtins::register_fast(b, fast); + } + d.insert(DictKey(Object::from_static(name)), f); + } // 3.14 `posix._is_inputhook_installed()` (gh-121886): `_pyrepl`'s // console polls it for `PyOS_InputHook`; WeavePy has no C input // hook, so it is always `False`. @@ -7688,8 +7706,11 @@ pub(crate) fn struct_seq_instance( let inst = crate::types::PyInstance::new(ty); { let mut d = inst.dict_cell().borrow_mut(); - for (field, value) in fields.iter().zip(values.iter()) { - d.insert(DictKey(Object::from_static(field)), value.clone()); + // (Room for the hidden extras `time.struct_time` adds.) + d.reserve(fields.len() + 2); + let keys = static_name_keys(fields); + for (key, value) in keys.iter().zip(values.iter()) { + d.insert(key.clone(), value.clone()); } } // Struct sequences subclass `tuple`, so give the instance a native tuple @@ -7701,6 +7722,222 @@ pub(crate) fn struct_seq_instance( Object::Instance(Rc::new(inst)) } +/// [`static_name_key`] for each of a struct sequence's `fields`, looked up +/// once per instance. +pub(crate) fn static_name_keys(fields: &'static [&'static str]) -> std::rc::Rc<[DictKey]> { + thread_local! { + static KEYS: RefCell, crate::fasthash::FxBuildHasher>> = + RefCell::new(std::collections::HashMap::default()); + } + let id = (fields.as_ptr() as usize, fields.len()); + if let Some(keys) = KEYS.with(|k| k.borrow().get(&id).cloned()) { + return keys; + } + let keys: std::rc::Rc<[DictKey]> = fields.iter().map(|f| static_name_key(f)).collect(); + KEYS.with(|k| k.borrow_mut().insert(id, keys.clone())); + keys +} + +/// The dictionary key for a static field name, built once per thread with +/// its hash cached: a struct sequence's fields (an `os.stat` result, a +/// `time.struct_time`) are stored and read without allocating or hashing +/// their names each time. +pub(crate) fn static_name_key(name: &'static str) -> DictKey { + thread_local! { + static KEYS: RefCell> = + RefCell::new(std::collections::HashMap::default()); + } + KEYS.with(|keys| { + let mut keys = keys.borrow_mut(); + let key = keys + .entry((name.as_ptr() as usize, name.len())) + .or_insert_with(|| { + let s = crate::shared_value::SharedStr::from(name); + crate::shared_value::SharedStr::hash_cached(&s); + Object::Str(s) + }); + DictKey(key.clone()) + }) +} + +/// The length of a POSIX path's root (`posixpath.splitroot`'s middle part): +/// none for a relative path, one separator for an absolute one, and two +/// for exactly two leading separators (implementation defined by POSIX). +#[cfg(not(windows))] +fn posix_root_len(p: &[T], sep: &T) -> usize { + if p.first() != Some(sep) { + 0 + } else if p.get(1) != Some(sep) || p.get(2) == Some(sep) { + 1 + } else { + 2 + } +} + +/// `posixpath.normpath`'s pure-Python algorithm over the units of `path` +/// (bytes, UTF-8 bytes or code points): `A//B`, `A/./B` and `A/foo/../B` +/// all become `A/B`. +#[cfg(not(windows))] +fn posix_normpath_units(path: &[T], sep: T, dot: T) -> Vec { + if path.is_empty() { + return vec![dot]; + } + let root = posix_root_len(path, &sep); + let (initial, rest) = path.split_at(root); + let dotdot = [dot, dot]; + let mut comps: Vec<&[T]> = Vec::new(); + for comp in rest.split(|c| *c == sep) { + if comp.is_empty() || comp == [dot] { + continue; + } + if comp != dotdot + || (initial.is_empty() && comps.is_empty()) + || comps.last().is_some_and(|l| *l == dotdot) + { + comps.push(comp); + } else { + comps.pop(); + } + } + let mut out = initial.to_vec(); + for (i, comp) in comps.iter().enumerate() { + if i > 0 { + out.push(sep); + } + out.extend_from_slice(comp); + } + if out.is_empty() { + out.push(dot); + } + out +} + +/// A path argument of `func` as `str` or `bytes` (an `os.PathLike`'s +/// `__fspath__()`), with CPython's `path_t` converter's message for +/// anything else. +#[cfg(not(windows))] +fn path_arg(func: &str, p: &Object) -> Result { + if matches!(p, Object::Instance(_)) { + return os_fspath(std::slice::from_ref(p)); + } + if matches!(p, Object::Str(_) | Object::WStr(_) | Object::Bytes(_)) { + return Ok(p.clone()); + } + Err(type_error(format!( + "{func}: path should be string, bytes or os.PathLike, not {}", + p.type_name() + ))) +} + +/// The leaf half of `_path_splitroot_ex` for a `str` or `bytes` path. +#[cfg(not(windows))] +fn path_splitroot_fast(args: &[Object]) -> Option> { + let r = match args { + [p @ Object::Str(s)] => { + let n = posix_root_len(s.as_bytes(), &b'/'); + let (root, tail) = s.split_at(n); + Object::new_tuple_array([ + Object::from_static(""), + Object::from_str(root.to_owned()), + if n == 0 { + p.clone() + } else { + Object::from_str(tail.to_owned()) + }, + ]) + } + [p @ Object::Bytes(b)] => { + let n = posix_root_len(b, &b'/'); + let (root, tail) = b.split_at(n); + Object::new_tuple_array([ + Object::new_bytes(Vec::new()), + Object::new_bytes(root.to_vec()), + if n == 0 { + p.clone() + } else { + Object::new_bytes(tail.to_vec()) + }, + ]) + } + _ => return None, + }; + Some(Ok(r)) +} + +/// `posix._path_splitroot_ex(p)`: split a pathname into drive (always +/// empty on POSIX), root and tail, as `posixpath`'s fallback does. +#[cfg(not(windows))] +fn os_path_splitroot_ex(args: &[Object]) -> Result { + let [p] = args else { + return Err(type_error(format!( + "_path_splitroot_ex() takes exactly one argument ({} given)", + args.len() + ))); + }; + if let Some(r) = path_splitroot_fast(args) { + return r; + } + let p = path_arg("_path_splitroot_ex", p)?; + if let Object::WStr(cps) = &p { + let n = posix_root_len(cps, &u32::from(b'/')); + return Ok(Object::new_tuple_array([ + Object::from_static(""), + Object::str_from_codepoints(cps[..n].to_vec()), + if n == 0 { + p.clone() + } else { + Object::str_from_codepoints(cps[n..].to_vec()) + }, + ])); + } + path_splitroot_fast(std::slice::from_ref(&p)) + .unwrap_or_else(|| Err(type_error("expected str, bytes or os.PathLike object"))) +} + +/// The leaf half of `_path_normpath` for a `str` or `bytes` path. +#[cfg(not(windows))] +fn path_normpath_fast(args: &[Object]) -> Option> { + let r = match args { + [Object::Str(s)] => { + // `/` and `.` are ASCII: splitting the UTF-8 bytes at them + // keeps every other character whole. + let out = posix_normpath_units(s.as_bytes(), b'/', b'.'); + match String::from_utf8(out) { + Ok(out) => Object::from_str(out), + Err(_) => return None, + } + } + [Object::Bytes(b)] => Object::new_bytes(posix_normpath_units(b, b'/', b'.')), + _ => return None, + }; + Some(Ok(r)) +} + +/// `posix._path_normpath(path)`: `posixpath.normpath`, as its pure-Python +/// fallback computes it. +#[cfg(not(windows))] +fn os_path_normpath(args: &[Object]) -> Result { + let [p] = args else { + return Err(type_error(format!( + "_path_normpath() takes exactly one argument ({} given)", + args.len() + ))); + }; + if let Some(r) = path_normpath_fast(args) { + return r; + } + let p = path_arg("_path_normpath", p)?; + if let Object::WStr(cps) = &p { + return Ok(Object::str_from_codepoints(posix_normpath_units( + cps, + u32::from(b'/'), + u32::from(b'.'), + ))); + } + path_normpath_fast(std::slice::from_ref(&p)) + .unwrap_or_else(|| Err(type_error("expected str, bytes or os.PathLike object"))) +} + /// Construct an `os.terminal_size` instance with the given dimensions. fn make_terminal_size(columns: i64, lines: i64) -> Object { struct_seq_instance( diff --git a/crates/weavepy-vm/src/stdlib/pickle_accel.rs b/crates/weavepy-vm/src/stdlib/pickle_accel.rs index 85724186..9d236854 100644 --- a/crates/weavepy-vm/src/stdlib/pickle_accel.rs +++ b/crates/weavepy-vm/src/stdlib/pickle_accel.rs @@ -14,10 +14,7 @@ mod classes; mod encode; -use std::hash::BuildHasher; - use crate::shared_value::{SharedSlice, SharedStr}; -use indexmap::map::raw_entry_v1::{RawEntryApiV1, RawEntryMut}; use num_bigint::BigInt; use weavepy_compiler::CodeObject; @@ -1149,15 +1146,15 @@ impl<'c> Decoder<'c> { }; // `insert` for a string key, which equals only another string: // the cached hash and a direct comparison, in line. - let hash = crate::fasthash::FxBuildHasher.hash_one(SharedStr::hash_cached(&name)); - match map.raw_entry_mut_v1().from_hash(hash, |key| { + let hash = SharedStr::hash_cached(&name); + match map.find_by_hash(hash, |key| { matches!(&key.0, Object::Str(other) if SharedStr::ptr_eq(other, &name) || *other == name) }) { - RawEntryMut::Occupied(mut entry) => { - entry.insert(value); + Some(i) => { + *map.get_index_mut(i).expect("found above").1 = value; } - RawEntryMut::Vacant(entry) => { - entry.insert_hashed_nocheck(hash, DictKey(Object::Str(name)), value); + None => { + map.insert_unique_hashed(hash, DictKey(Object::Str(name)), value); } } } @@ -1273,7 +1270,7 @@ impl<'c> Decoder<'c> { let table: &mut DictMap = &mut state; // An interned key is equal to the key it replaces and has the // same hash, so the table stays valid. - for (key, _) in indexmap::map::MutableKeys::iter_mut2(&mut *table) { + for (key, _) in table.iter_mut2() { let Object::Str(name) = &key.0 else { return None; }; @@ -1682,6 +1679,7 @@ mod tests { #[test] fn decoded_strings_keep_utf8_and_memo_aliases() { + let _gil = crate::gil::hold_gil(); let empty = decode(b"\x80\x05\x8c\x00.").unwrap(); assert!(matches!(empty, Object::Str(value) if value.is_empty())); let result = decode(b"\x80\x05]\x94(\x8c\x05\xc3\xa9\xe2\x82\xac\x94h\x01e.").unwrap(); @@ -1696,6 +1694,7 @@ mod tests { #[test] fn decode_scalars_frames_and_memo_aliases() { + let _gil = crate::gil::hold_gil(); assert!(matches!(decode(b"\x80\x04N."), Some(Object::None))); let value = decode(b"\x80\x05\x95\x04\0\0\0\0\0\0\0K\x07\x85.").unwrap(); let Object::Tuple(tuple) = value else { @@ -1714,6 +1713,7 @@ mod tests { #[test] fn preflight_rejects_cycles_deep_graphs_and_unsupported_keys() { + let _gil = crate::gil::hold_gil(); for data in [ &b"\x80\x05]\x94h\x00a."[..], &b"\x80\x05]\x94(h\x00\x85e."[..], diff --git a/crates/weavepy-vm/src/stdlib/pickle_accel/classes.rs b/crates/weavepy-vm/src/stdlib/pickle_accel/classes.rs index f2b7ab3c..4dbed92b 100644 --- a/crates/weavepy-vm/src/stdlib/pickle_accel/classes.rs +++ b/crates/weavepy-vm/src/stdlib/pickle_accel/classes.rs @@ -5,8 +5,6 @@ //! could require a Python callback reports `None` so that the caller returns //! to the full pickler or unpickler. -use std::hash::BuildHasher; - use crate::builtin_types::builtin_types; use crate::object::{py_str_hash, DictData, Object, StrKey}; use crate::sync::{Rc, RefCell}; @@ -65,12 +63,10 @@ pub(super) fn ambient_state_is_plain() -> bool { /// The outer `None` reports a stored key that isn't an exact `str` in the /// probe sequence. Comparing with it could call a Python `__eq__`. pub(super) fn pure_get(dict: &DictData, name: &str) -> Option> { - use indexmap::map::raw_entry_v1::RawEntryApiV1; - let hash = crate::fasthash::FxBuildHasher.hash_one(py_str_hash(name)); + let hash = py_str_hash(name); let mut exotic = false; let found = dict - .raw_entry_v1() - .from_hash(hash, |key| match &key.0 { + .find_by_hash(hash, |key| match &key.0 { Object::Str(stored) => stored.as_ref() == name, Object::WStr(_) => false, _ => { @@ -78,6 +74,7 @@ pub(super) fn pure_get(dict: &DictData, name: &str) -> Option> { false } }) + .and_then(|i| dict.get_index(i)) .map(|(_, value)| value.clone()); if exotic { None diff --git a/crates/weavepy-vm/src/stdlib/pickle_accel/encode.rs b/crates/weavepy-vm/src/stdlib/pickle_accel/encode.rs index 9159f658..950a7464 100644 --- a/crates/weavepy-vm/src/stdlib/pickle_accel/encode.rs +++ b/crates/weavepy-vm/src/stdlib/pickle_accel/encode.rs @@ -908,6 +908,7 @@ mod tests { #[test] fn list_batches_preserve_shared_children() { + let _gil = crate::gil::hold_gil(); let child = Object::new_list(vec![Object::Int(7)]); let value = Object::new_list(vec![child; 2001]); let bytes = encode_with_headroom(&value, 5, 1000).unwrap(); @@ -922,6 +923,7 @@ mod tests { #[test] fn list_encoding_tolerates_concurrent_resizing() { + let _gil = crate::gil::hold_gil(); // Two raw threads share a cell with no GIL between them: the // contract `GilCell` documents is that such threads announce // themselves before touching objects. (The bias alone is diff --git a/crates/weavepy-vm/src/stdlib/python/posix_mod.py b/crates/weavepy-vm/src/stdlib/python/posix_mod.py index 65856df2..25d60693 100644 --- a/crates/weavepy-vm/src/stdlib/python/posix_mod.py +++ b/crates/weavepy-vm/src/stdlib/python/posix_mod.py @@ -34,6 +34,11 @@ # 3.14: `_pyrepl`'s console polls `posix._is_inputhook_installed()` / # `nt._is_inputhook_installed()` for `PyOS_InputHook`. _is_inputhook_installed = _os._is_inputhook_installed +# CPython's C accelerators for `posixpath.splitroot` and `posixpath.normpath` +# (`posixpath` imports them from here when present). +if hasattr(_os, "_path_normpath"): + _path_normpath = _os._path_normpath + _path_splitroot_ex = _os._path_splitroot_ex if hasattr(_os, "_fcopyfile"): _fcopyfile = _os._fcopyfile diff --git a/crates/weavepy-vm/src/stdlib/python/struct.py b/crates/weavepy-vm/src/stdlib/python/struct.py index 2454cb1e..6897c12a 100644 --- a/crates/weavepy-vm/src/stdlib/python/struct.py +++ b/crates/weavepy-vm/src/stdlib/python/struct.py @@ -339,6 +339,13 @@ def __sizeof__(self): return object.__sizeof__(self) +# CPython's `Struct` is a C type: serve the exact class's `pack` and +# `unpack` natively (the methods above stay the fallback for every other +# shape, errors included). +if hasattr(_impl, "_install_struct"): + _impl._install_struct(Struct) + + def _new_struct(fmt): return Struct(fmt) diff --git a/crates/weavepy-vm/src/stdlib/sre_mod.rs b/crates/weavepy-vm/src/stdlib/sre_mod.rs index b7d2d7c9..48bcdab5 100644 --- a/crates/weavepy-vm/src/stdlib/sre_mod.rs +++ b/crates/weavepy-vm/src/stdlib/sre_mod.rs @@ -146,6 +146,14 @@ pub(crate) struct CompiledCode { /// table of the character set starting there ([`NO_TABLE`] for none). table_of: Vec, tables: Vec<[u64; 4]>, + /// Per code position, the index in `quick_ranges` of the tests of the + /// assertion body starting there when it is one character test or an + /// alternation of such tests ([`NO_TABLE`] for none; see + /// [`quick_asserts`]). + quick_of: Vec, + /// Each quick assertion body's slice of `quick_tests`. + quick_ranges: Vec<(u32, u32)>, + quick_tests: Vec, /// Whether the pattern was a `str` (`Some(true)`) or a bytes-like /// object (`Some(false)`); `None` for a pattern compiled from a parsed /// tree (`re.Scanner`), which, like CPython's, accepts either subject. @@ -200,11 +208,15 @@ fn publish(idx: usize, cc: &'static CompiledCode) { /// Register compiled code; the handle indexes the registry. pub(crate) fn register_code(code: Vec, groups: usize, is_str: Option) -> i64 { let (table_of, tables) = set_tables(&code); + let (quick_of, quick_ranges, quick_tests) = quick_asserts(&code); let cc: &'static CompiledCode = Box::leak(Box::new(CompiledCode { code, groups, table_of, tables, + quick_of, + quick_ranges, + quick_tests, is_str, })); let mut reg = registry().lock(); @@ -214,6 +226,90 @@ pub(crate) fn register_code(code: Vec, groups: usize, is_str: Option) idx as i64 } +/// One test of a quick assertion body (see [`quick_asserts`]). +#[derive(Clone, Copy)] +enum QuickTest { + /// The character at the position meets this requirement. + Char(TailFirst), + /// The position is this `AT` position. + At(u32), +} + +/// The assertion bodies in `code` that test one character (a literal or +/// a set, possibly case-folded) or a position (`AT`), or an alternation +/// of such tests, as lists the matcher evaluates in place instead of +/// entering itself (such a body sets no marks): textwrap's word splitter +/// asserts this way at every character (`(?=\s|\Z)`, +/// `(?<=[\w!"'&.,?])`). As for [`set_tables`], every word equal to an +/// assertion opcode is tried; the matcher only consults real bodies. +fn quick_asserts(code: &[u32]) -> (Vec, Vec<(u32, u32)>, Vec) { + // One test at `op`, and the op after it. + let one = |op: usize| -> Option<(QuickTest, usize)> { + match *code.get(op)? { + OP_AT => Some((QuickTest::At(*code.get(op + 1)?), op + 2)), + OP_LITERAL | OP_LITERAL_IGNORE | OP_LITERAL_UNI_IGNORE => { + code.get(op + 1)?; + Some((QuickTest::Char(Matcher::::item_first(code, op)), op + 2)) + } + OP_IN | OP_IN_IGNORE | OP_IN_UNI_IGNORE => { + let skip = *code.get(op + 1)? as usize; + if skip < 2 || code.get(op + 1 + skip - 1) != Some(&OP_FAILURE) { + return None; + } + Some(( + QuickTest::Char(Matcher::::item_first(code, op)), + op + 1 + skip, + )) + } + _ => None, + } + }; + let body_tests = |body: usize| -> Option> { + if *code.get(body)? != OP_BRANCH { + let (t, next) = one(body)?; + return (*code.get(next)? == OP_SUCCESS).then(|| vec![t]); + } + // ` ( )* <0>`, the tail the + // body's end. + let mut tests = Vec::new(); + let mut alt = body + 1; + let mut tail = None; + while *code.get(alt)? != 0 { + let (t, next) = one(alt + 1)?; + if *code.get(next)? != OP_JUMP { + return None; + } + let to = next + 1 + *code.get(next + 1)? as usize; + if tail.is_some_and(|t| t != to) { + return None; + } + tail = Some(to); + tests.push(t); + alt += *code.get(alt)? as usize; + } + (*code.get(tail?)? == OP_SUCCESS).then_some(tests) + }; + let mut quick_of = vec![NO_TABLE; code.len()]; + let mut ranges = Vec::new(); + let mut tests = Vec::new(); + for (i, &op) in code.iter().enumerate() { + // + if !matches!(op, OP_ASSERT | OP_ASSERT_NOT) { + continue; + } + let body = i + 3; + if body >= code.len() || quick_of[body] != NO_TABLE { + continue; + } + if let Some(list) = body_tests(body) { + quick_of[body] = ranges.len() as u32; + ranges.push((tests.len() as u32, (tests.len() + list.len()) as u32)); + tests.extend(list); + } + } + (quick_of, ranges, tests) +} + const NO_TABLE: u32 = u32::MAX; /// Membership tables over the first 256 code points for the character @@ -659,6 +755,7 @@ struct Matcher<'a, C: SreChar> { /// The compiled code's set tables (see [`set_tables`]). table_of: &'a [u32], tables: &'a [[u64; 4]], + cc: &'a CompiledCode, beginning: usize, start: usize, end: usize, @@ -786,6 +883,7 @@ impl<'a, C: SreChar> Matcher<'a, C> { code: &cc.code, table_of: &cc.table_of, tables: &cc.tables, + cc, beginning: 0, start: 0, end: s.len(), @@ -1031,6 +1129,9 @@ impl<'a, C: SreChar> Matcher<'a, C> { r } + // (In line in the matcher's `AT` arm, which a second caller, the + // quick assertions, would otherwise talk the compiler out of.) + #[inline(always)] fn at(&self, ptr: usize, atcode: u32) -> bool { let s = self.s; match atcode { @@ -1232,6 +1333,26 @@ impl<'a, C: SreChar> Matcher<'a, C> { self.can_start(self.tail_first(body), pos) } + /// The verdict at `pos` of the assertion body at `body` when it is a + /// quick one (see [`quick_asserts`]); `None` for any other body. + #[inline] + fn quick_assert(&self, body: usize, pos: usize) -> Option { + let cc = self.cc; + let at = *cc.quick_of.get(body)?; + if at == NO_TABLE { + return None; + } + let (from, to) = cc.quick_ranges[at as usize]; + Some( + cc.quick_tests[from as usize..to as usize] + .iter() + .any(|t| match *t { + QuickTest::Char(first) => self.simple_can_start(first, pos), + QuickTest::At(code) => self.at(pos, code), + }), + ) + } + /// The requirement of the single-character op at `op`. #[inline(always)] fn item_first(code: &[u32], op: usize) -> TailFirst { @@ -1966,8 +2087,14 @@ impl<'a, C: SreChar> Matcher<'a, C> { if ptr - self.beginning < back { return Ok(false); } - self.ptr = ptr - back; - if !self.do_match(pat + 2, false)? { + let matched = match self.quick_assert(pat + 2, ptr - back) { + Some(matched) => matched, + None => { + self.ptr = ptr - back; + self.do_match(pat + 2, false)? + } + }; + if !matched { return Ok(false); } pat += skip; @@ -1976,10 +2103,16 @@ impl<'a, C: SreChar> Matcher<'a, C> { let skip = code[pat] as usize; let back = code[pat + 1] as usize; if ptr - self.beginning >= back { - self.ptr = ptr - back; - let save = self.snapshot(); - let matched = self.do_match(pat + 2, false)?; - self.restore(&save); + let matched = match self.quick_assert(pat + 2, ptr - back) { + Some(matched) => matched, + None => { + self.ptr = ptr - back; + let save = self.snapshot(); + let matched = self.do_match(pat + 2, false)?; + self.restore(&save); + matched + } + }; if matched { return Ok(false); } diff --git a/crates/weavepy-vm/src/stdlib/struct_mod.rs b/crates/weavepy-vm/src/stdlib/struct_mod.rs index 2a29f96b..ddc93741 100644 --- a/crates/weavepy-vm/src/stdlib/struct_mod.rs +++ b/crates/weavepy-vm/src/stdlib/struct_mod.rs @@ -915,6 +915,16 @@ pub fn build(_cache: &ModuleCache) -> Rc { register(&mut d, "pack_into", b_pack_into); register(&mut d, "unpack_from", b_unpack_from); register(&mut d, "iter_unpack", b_iter_unpack); + let install = Rc::new(BuiltinFn { + name: "_install_struct", + binds_instance: false, + call: Box::new(install_struct), + call_kw: None, + }); + d.insert( + DictKey(Object::from_static("_install_struct")), + Object::Builtin(install), + ); } Rc::new(PyModule { name: "_struct".to_owned(), @@ -970,6 +980,155 @@ fn compiled(fmt: &str) -> Result, RuntimeError> { /// `_clearcache()`: flush the compiled formats. fn b_clearcache(_args: &[Object]) -> Result { FORMATS.with(|c| c.borrow_mut().clear()); + BY_STRING.with(|c| c.borrow_mut().clear()); + Ok(Object::None) +} + +/// The address of the exact `struct.Struct` class [`install_struct`] +/// last served (its native methods keep it alive). +static STRUCT_CLASS: std::sync::atomic::AtomicUsize = std::sync::atomic::AtomicUsize::new(0); + +thread_local! { + /// Compiled formats by the identity of a `Struct`'s format string + /// (each held here, so an address names one string), most recent + /// first: a `Struct` hands its methods the same string every call. + static BY_STRING: std::cell::RefCell)>> = + const { std::cell::RefCell::new(Vec::new()) }; +} + +/// How many format strings [`BY_STRING`] remembers. +const BY_STRING_MAX: usize = 8; + +/// The compiled format of a `Struct`'s format string `fmt`. +fn compiled_for(fmt: &crate::shared_value::SharedStr) -> Option> { + let addr = crate::shared_value::SharedStr::addr(fmt); + let hit = BY_STRING.with(|c| { + c.try_borrow().ok().and_then(|c| { + c.iter() + .find(|(s, _)| crate::shared_value::SharedStr::addr(s) == addr) + .map(|(_, cf)| cf.clone()) + }) + }); + if hit.is_some() { + return hit; + } + let cf = compiled(fmt).ok()?; + BY_STRING.with(|c| { + if let Ok(mut c) = c.try_borrow_mut() { + c.truncate(BY_STRING_MAX - 1); + c.insert(0, (fmt.clone(), cf.clone())); + } + }); + Some(cf) +} + +/// The compiled format of `recv` when it is an exact, initialized +/// `struct.Struct` whose `_fmt` is a plain `str` in its own dictionary +/// (anything else is the Python method's to serve). +fn struct_format(recv: &Object) -> Option> { + let Object::Instance(inst) = recv else { + return None; + }; + let class = std::ptr::from_ref(inst.cls_raw()) as usize; + if class != STRUCT_CLASS.load(std::sync::atomic::Ordering::Relaxed) { + return None; + } + match inst.attr_get_str("_fmt")? { + Object::Str(fmt) => compiled_for(&fmt), + _ => None, + } +} + +/// `Struct.pack(self, *values)` over plain values (what `_pack_plain` +/// packs), or `None` for the Python method, which also owns every error. +fn struct_pack_fast(args: &[Object]) -> Option> { + let (recv, values) = args.split_first()?; + let plain = values.iter().all(|v| { + matches!( + v, + Object::Int(_) + | Object::Long(_) + | Object::Bool(_) + | Object::Float(_) + | Object::Complex(_) + | Object::Str(_) + | Object::Bytes(_) + | Object::ByteArray(_) + ) + }); + if !plain { + return None; + } + let cf = struct_format(recv)?; + let bytes = cf.pack(values).ok()?; + Some(Ok(Object::new_bytes(bytes))) +} + +/// `Struct.unpack(self, buffer)` of a `bytes` buffer, or `None` for the +/// Python method, which also owns every error. +fn struct_unpack_fast(args: &[Object]) -> Option> { + let [recv, Object::Bytes(buf)] = args else { + return None; + }; + let cf = struct_format(recv)?; + let vals = cf.unpack(buf).ok()?; + Some(Ok(Object::new_tuple(vals))) +} + +/// `_install_struct(Struct)`: serve the exact class's `pack` and +/// `unpack` natively (CPython's `Struct` is a C type), each falling back +/// to the Python method it replaces for every other shape. +fn install_struct(args: &[Object]) -> Result { + let [Object::Type(cls)] = args else { + return Err(type_error("_install_struct() expects the Struct class")); + }; + let own = |name: &str| cls.dict.borrow().get(&crate::object::StrKey(name)).cloned(); + let (Some(pack), Some(unpack)) = (own("pack"), own("unpack")) else { + return Err(type_error("_install_struct(): Struct lacks pack/unpack")); + }; + type Fast = fn(&[Object]) -> Option>; + for (name, fast, orig) in [ + ("pack", struct_pack_fast as Fast, pack), + ("unpack", struct_unpack_fast as Fast, unpack), + ] { + // (The natives keep the class alive: its address stays its own.) + let class = cls.clone(); + let fallback = move |a: &[Object], kw: &[(String, Object)]| { + let _ = &class; + let f = orig.clone(); + let ptr = crate::vm_singletons::current_interpreter_ptr() + .ok_or_else(|| type_error("struct: no active interpreter"))?; + // SAFETY: published by the enclosing VM frame on this thread. + unsafe { &mut *ptr }.call_object(f, a, kw) + }; + let fallback = Rc::new(fallback); + let fallback_kw = fallback.clone(); + let b = Rc::new(BuiltinFn { + name, + binds_instance: true, + call: Box::new(move |a: &[Object]| match fast(a) { + Some(r) => r, + None => fallback(a, &[]), + }), + call_kw: Some(Box::new(move |a: &[Object], kw: &[(String, Object)]| { + if kw.is_empty() { + if let Some(r) = fast(a) { + return r; + } + } + fallback_kw(a, kw) + })), + }); + crate::leaf_builtins::register_fast(&b, fast); + cls.dict + .borrow_mut() + .insert(DictKey(Object::from_static(name)), Object::Builtin(b)); + } + cls.bump_attr_version(); + STRUCT_CLASS.store( + Rc::as_ptr(cls) as usize, + std::sync::atomic::Ordering::Relaxed, + ); Ok(Object::None) } diff --git a/crates/weavepy-vm/src/stdlib/sys.rs b/crates/weavepy-vm/src/stdlib/sys.rs index b3b56f99..0bda778a 100644 --- a/crates/weavepy-vm/src/stdlib/sys.rs +++ b/crates/weavepy-vm/src/stdlib/sys.rs @@ -34,7 +34,7 @@ pub const PY_VERSION: (i64, i64, i64) = ( pub fn build_with_state( cache: &ModuleCache, frame_stack: crate::object::FrameStack, - exc_info_stack: Rc>>, + exc_info_stack: Rc>>, excepthook: Rc>, unraisable_hook: Rc>, ) -> Rc { @@ -54,8 +54,8 @@ pub fn build_with_state( name: "_getframe", binds_instance: false, call: Box::new(move |args| { - if let Some(h) = crate::vm_singletons::current_thread_handles() { - sys_getframe(args, &h.frame_stack) + if let Some(fs) = crate::vm_singletons::current_frame_stack() { + sys_getframe(args, &fs) } else { sys_getframe(args, &fs_fallback) } @@ -70,8 +70,8 @@ pub fn build_with_state( name: "_getframemodulename", binds_instance: false, call: Box::new(move |args| { - if let Some(h) = crate::vm_singletons::current_thread_handles() { - sys_getframemodulename(args, &h.frame_stack) + if let Some(fs) = crate::vm_singletons::current_frame_stack() { + sys_getframemodulename(args, &fs) } else { sys_getframemodulename(args, &fs_fallback_modname) } @@ -96,20 +96,24 @@ pub fn build_with_state( })), ); let es_fallback_exc = exc_info_stack.clone(); + let exception = Rc::new(BuiltinFn { + name: "exception", + binds_instance: false, + call: Box::new(move |_| { + if let Some(h) = crate::vm_singletons::current_thread_handles() { + sys_exception(&h.exc_info_stack) + } else { + sys_exception(&es_fallback_exc) + } + }), + call_kw: None, + }); + // Reads the handled-exception stack: no Python runs, and no frame + // is looked at (`ExitStack.__exit__` calls it every time). + crate::leaf_builtins::register(&exception); d.insert( DictKey(Object::from_static("exception")), - Object::Builtin(Rc::new(BuiltinFn { - name: "exception", - binds_instance: false, - call: Box::new(move |_| { - if let Some(h) = crate::vm_singletons::current_thread_handles() { - sys_exception(&h.exc_info_stack) - } else { - sys_exception(&es_fallback_exc) - } - }), - call_kw: None, - })), + Object::Builtin(exception), ); d.insert( DictKey(Object::from_static("__excepthook__")), @@ -396,11 +400,7 @@ pub fn build_with_state( { // 3.12+: the value is the handled exception // *instance* (None outside any `except`). - let value = exc - .borrow() - .last() - .map(|top| top.instance.clone()) - .unwrap_or(Object::None); + let value = exc.borrow().last().cloned().unwrap_or(Object::None); d.insert(DictKey(Object::Int(ident as i64)), value); } Ok(Object::Dict(Rc::new(RefCell::new(d)))) @@ -1564,18 +1564,25 @@ fn sys_getframe( args: &[Object], frame_stack: &crate::object::FrameStack, ) -> Result { - crate::builtins::sync_frame_spine(); if args.len() > 1 { return Err(type_error(format!( "_getframe expected at most 1 argument, got {}", args.len() ))); } - let depth = match args.first() { + let mut depth = match args.first() { Some(Object::Int(d)) => *d as usize, None => 0, _ => return Err(type_error("depth must be an int")), }; + // Only the activations up to the one asked for need their shells: the + // newer ones stay lean. + match crate::builtins::reentrant_interp() { + Ok(interp) if Rc::ptr_eq(&interp.frame_stack, frame_stack) => { + depth = interp.flush_pending_through(depth); + } + _ => crate::builtins::sync_frame_spine(), + } // The topmost frame is the currently-executing one, which is // the *callee* of `sys._getframe`. CPython considers the // calling frame as depth 0; we mirror by indexing from the back. @@ -1586,10 +1593,12 @@ fn sys_getframe( let idx = len - 1 - depth; // RFC 0058: the spine holds cheap shells; the Python-visible // frame object is materialised on demand right here. - match crate::object::materialize_stack_at(frame_stack, idx) { + match crate::object::materialize_stack_at_lazy(frame_stack, idx) { Some(py) => { // PEP 578: `sys._getframe` audits with the frame object. - audit_event("sys._getframe", &[Object::Frame(py.clone())])?; + if crate::trace::any_audit_active() { + audit_event("sys._getframe", &[Object::Frame(py.clone())])?; + } Ok(Object::Frame(py)) } None => Err(value_error("call stack is not deep enough")), @@ -1604,7 +1613,6 @@ fn sys_getframemodulename( args: &[Object], frame_stack: &crate::object::FrameStack, ) -> Result { - crate::builtins::sync_frame_spine(); let depth = match args.first() { Some(o) => match o { Object::Int(d) => *d, @@ -1616,17 +1624,29 @@ fn sys_getframemodulename( if depth < 0 { return Ok(Object::None); } + // The globals are read where the activation is, lean or not. + if let Ok(interp) = crate::builtins::reentrant_interp() { + if Rc::ptr_eq(&interp.frame_stack, frame_stack) { + let Some(globals) = interp.frame_globals_at(depth as usize) else { + return Ok(Object::None); + }; + let name = globals + .borrow() + .get(&crate::object::StrKey("__name__")) + .cloned(); + return Ok(name.unwrap_or(Object::None)); + } + } + crate::builtins::sync_frame_spine(); let len = frame_stack.borrow().len(); let depth = depth as usize; if depth >= len { return Ok(Object::None); } let idx = len - 1 - depth; - let Some(py) = crate::object::materialize_stack_at(frame_stack, idx) else { - return Ok(Object::None); - }; - let name = py - .globals + // The shell's globals are the frame's: no frame object needed. + let globals = frame_stack.borrow()[idx].globals.clone(); + let name = globals .borrow() .get(&crate::object::StrKey("__name__")) .cloned(); @@ -1636,13 +1656,11 @@ fn sys_getframemodulename( /// `sys.exception()` (PEP 3134 / 3.11+): the exception instance currently /// being handled, or `None` if not in an `except`. Equivalent to /// `sys.exc_info()[1]`. The verbatim CPython `contextlib` relies on this. -fn sys_exception( - exc_info_stack: &Rc>>, -) -> Result { +fn sys_exception(exc_info_stack: &Rc>>) -> Result { let stack = exc_info_stack.borrow(); Ok(stack .last() - .map(|top| top.instance.clone()) + .cloned() .or_else(capi_handled_exception_instance) .unwrap_or(Object::None)) } @@ -1657,13 +1675,11 @@ fn capi_handled_exception_instance() -> Option { crate::foreign::capi_handled_exception() } -fn sys_exc_info( - exc_info_stack: &Rc>>, -) -> Result { +fn sys_exc_info(exc_info_stack: &Rc>>) -> Result { let stack = exc_info_stack.borrow(); let inst = stack .last() - .map(|top| top.instance.clone()) + .cloned() .or_else(capi_handled_exception_instance); if let Some(inst) = inst { let type_obj = match &inst { @@ -2826,9 +2842,18 @@ thread_local! { static CORO_ORIGIN_DEPTH: std::cell::Cell = const { std::cell::Cell::new(0) }; } +/// Whether any thread ever set a nonzero coroutine origin tracking depth: +/// until one does, every thread's depth is `0` without a thread-local read +/// (the coroutine constructors ask on every call). +static CORO_ORIGIN_EVER: std::sync::atomic::AtomicBool = std::sync::atomic::AtomicBool::new(false); + /// Current `sys.get_coroutine_origin_tracking_depth()` value; read by /// the interpreter when constructing coroutine objects. +#[inline] pub fn coroutine_origin_tracking_depth() -> i64 { + if !CORO_ORIGIN_EVER.load(std::sync::atomic::Ordering::Relaxed) { + return 0; + } CORO_ORIGIN_DEPTH.with(std::cell::Cell::get) } @@ -2845,6 +2870,9 @@ fn sys_set_coroutine_origin_tracking_depth(args: &[Object]) -> Result= 0")); } + if depth != 0 { + CORO_ORIGIN_EVER.store(true, std::sync::atomic::Ordering::Relaxed); + } CORO_ORIGIN_DEPTH.with(|c| c.set(depth)); Ok(Object::None) } diff --git a/crates/weavepy-vm/src/stdlib/testinternalcapi_mod.rs b/crates/weavepy-vm/src/stdlib/testinternalcapi_mod.rs index 89cd0e90..a58ebd45 100644 --- a/crates/weavepy-vm/src/stdlib/testinternalcapi_mod.rs +++ b/crates/weavepy-vm/src/stdlib/testinternalcapi_mod.rs @@ -313,13 +313,7 @@ fn remove_mem_hooks(_args: &[Object]) -> Result { // reap chokepoints. // ------------------------------------------------------------------ -static REFTRACE_PRINT: std::sync::atomic::AtomicBool = std::sync::atomic::AtomicBool::new(false); - -/// [`reftrace_print_active`]'s byte (nonzero while active), for compiled -/// code that tests it in line. -pub(crate) fn reftrace_print_flag() -> *const u8 { - REFTRACE_PRINT.as_ptr().cast_const().cast() -} +static REFTRACE_PRINT: &std::sync::atomic::AtomicBool = &crate::sync::RELEASE_GATES.reftrace_print; /// Consulted by the VM's allocation/reap chokepoints. #[inline] diff --git a/crates/weavepy-vm/src/stdlib/thread_real.rs b/crates/weavepy-vm/src/stdlib/thread_real.rs index 0b94f6b2..461145b8 100644 --- a/crates/weavepy-vm/src/stdlib/thread_real.rs +++ b/crates/weavepy-vm/src/stdlib/thread_real.rs @@ -363,27 +363,48 @@ const TIMEOUT_MAX_SECS: f64 = 9_223_372_036.0; /// forwards to that instance's own closure, so both the VM's instance-dict /// path and a C extension's type-level lookup reach the identical /// implementation. -/// The instance-dict entry `name` of `inst`, probed with `name`'s hash as -/// `hash` caches it (computed on first use; `0` is "not yet"). +/// Where a trampoline last found its instance-dict entry: the name's hash +/// (computed on first use; `0` is "not yet") and the entry's position. +/// Every lock's dict is built in the same order, so the position settles a +/// lookup with one key comparison. +#[derive(Default)] +struct ClosureSite { + hash: std::sync::atomic::AtomicI64, + at: std::sync::atomic::AtomicUsize, +} + +/// The instance-dict entry `name` of `inst`, at the position `site` last +/// found it in, else probed with `name`'s hash. fn instance_closure( inst: &crate::types::PyInstance, name: &'static str, - hash: &std::sync::atomic::AtomicI64, + site: &ClosureSite, ) -> Option { use std::sync::atomic::Ordering::Relaxed; - let mut h = hash.load(Relaxed); + let at = site.at.load(Relaxed); + // SAFETY: a read under the GIL that ends before anything else runs. + if let Some(d) = inst.dict.published().and_then(|d| unsafe { d.peek() }) { + if let Some((DictKey(Object::Str(k)), v)) = d.get_index(at) { + // (A short name compared in line, without `memcmp`.) + let (k, n) = (k.as_bytes(), name.as_bytes()); + if k.len() == n.len() && k.iter().zip(n).all(|(a, b)| a == b) { + return Some(v.clone()); + } + } + } + let d = inst.dict_cell().borrow(); + let mut h = site.hash.load(Relaxed); if h == 0 { h = crate::object::py_str_hash(name); - hash.store(h, Relaxed); + site.hash.store(h, Relaxed); } - inst.dict_cell() - .borrow() - .get(&crate::object::StrKeyHashed { s: name, hash: h }) - .cloned() + let (i, _, v) = d.get_full(&crate::object::StrKeyHashed { s: name, hash: h })?; + site.at.store(i, Relaxed); + Some(v.clone()) } fn instance_dunder_trampoline(name: &'static str) -> Object { - let hash = std::sync::atomic::AtomicI64::new(0); + let site = ClosureSite::default(); Object::Builtin(Rc::new(BuiltinFn { name, binds_instance: true, @@ -391,7 +412,7 @@ fn instance_dunder_trampoline(name: &'static str) -> Object { let Some(Object::Instance(inst)) = args.first() else { return Err(type_error(format!("{name}() requires an instance"))); }; - let closure = instance_closure(inst, name, &hash); + let closure = instance_closure(inst, name, &site); match closure { Some(Object::Builtin(b)) => (b.call)(&args[1..]), _ => Err(type_error(format!("instance has no {name}"))), @@ -409,7 +430,7 @@ fn instance_dunder_trampoline(name: &'static str) -> Object { /// reachable via the type, not just the instance dict (RFC 0072 WS2). fn instance_method_trampoline(name: &'static str) -> Object { // (Shared by both halves below.) - let hash = std::sync::Arc::new(std::sync::atomic::AtomicI64::new(0)); + let site = std::sync::Arc::new(ClosureSite::default()); let forward = move |args: &[Object], kwargs: &[(String, Object)]| -> Result { let Some(Object::Instance(inst)) = args.first() else { @@ -417,7 +438,7 @@ fn instance_method_trampoline(name: &'static str) -> Object { "descriptor '{name}' requires a lock instance" ))); }; - let closure = instance_closure(inst, name, &hash); + let closure = instance_closure(inst, name, &site); match closure { Some(Object::Builtin(b)) => match &b.call_kw { Some(kw) => kw(&args[1..], kwargs), @@ -731,6 +752,7 @@ fn make_lock_object(lock: Arc) -> Object { finalize_ran: crate::sync::Cell::new(false), deferred: crate::sync::Cell::new(false), c_body: crate::types::CBody::default(), + gc_slot: crate::gc_trace::GcSlot::new(), }); Object::Instance(inst) } @@ -916,6 +938,7 @@ fn make_rlock_object(rlock: Arc) -> Object { finalize_ran: crate::sync::Cell::new(false), deferred: crate::sync::Cell::new(false), c_body: crate::types::CBody::default(), + gc_slot: crate::gc_trace::GcSlot::new(), }); Object::Instance(inst) } @@ -1384,6 +1407,16 @@ fn spawn_python_worker( std::thread::yield_now(); }; entry.mark_started(); + // Acquire the process-wide GIL before touching any + // Python state -- building the worker's interpreter included + // (a fresh one, or a fork of the seed, populates and clones + // objects a peer's collection may be reading). Push onto the + // shared [`crate::gil::push_gil_guard`] stack so any builtin + // we call (e.g. `lock.acquire()`) can drop the GIL via + // `allow_threads_then` for the duration of the blocking + // section, then re-acquire on return. + let gil = crate::gil::global_gil(); + crate::gil::push_gil_guard(gil.acquire()); let mut worker_interp = match parent_fork { Some(fork) => { // Forked on the spawning thread; still install the @@ -1398,14 +1431,6 @@ fn spawn_python_worker( None => crate::Interpreter::new(), }, }; - // Acquire the process-wide GIL before touching any - // Python state. Push onto the shared - // [`crate::gil::push_gil_guard`] stack so any builtin - // we call (e.g. `lock.acquire()`) can drop the GIL via - // `allow_threads_then` for the duration of the blocking - // section, then re-acquire on return. - let gil = crate::gil::global_gil(); - crate::gil::push_gil_guard(gil.acquire()); let call_result = std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| { worker_interp.call_object(worker_func.clone(), &positional, &kwargs_pairs) })); @@ -1834,6 +1859,7 @@ fn make_thread_handle_object(state: Arc, ident: Object) -> Ob finalize_ran: crate::sync::Cell::new(false), deferred: crate::sync::Cell::new(false), c_body: crate::types::CBody::default(), + gc_slot: crate::gc_trace::GcSlot::new(), }); Object::Instance(inst) } @@ -1959,6 +1985,7 @@ mod tests { #[test] fn allocate_lock_returns_lock_object() { + let _gil = crate::gil::hold_gil(); let l = allocate_lock(&[]).unwrap(); match l { Object::Instance(inst) => { diff --git a/crates/weavepy-vm/src/stdlib/time.rs b/crates/weavepy-vm/src/stdlib/time.rs index 8bd8a3f0..9d508193 100644 --- a/crates/weavepy-vm/src/stdlib/time.rs +++ b/crates/weavepy-vm/src/stdlib/time.rs @@ -290,15 +290,27 @@ const STRUCT_TIME_FIELDS: [&str; 9] = [ /// bare tuple (the old shape) broke them with `'tuple' object has no attribute /// 'tm_year'`. fn struct_time_type() -> Rc { - // Full CPython layout: 9 sequence slots plus the two hidden named - // members, so `n_fields` is 11 and an 10/11-element constructor sequence - // fills `tm_zone`/`tm_gmtoff` positionally (test_structseq). - let slots: Vec> = STRUCT_TIME_FIELDS - .iter() - .map(|f| Some(*f)) - .chain([Some("tm_zone"), Some("tm_gmtoff")]) - .collect(); - crate::stdlib::os::struct_seq_type_layout("struct_time", "time", slots, 9) + // (The registry memoises the type per thread too; this skips building + // the layout and the name lookup for every `localtime`.) + thread_local! { + static TYPE: std::cell::OnceCell> = + const { std::cell::OnceCell::new() }; + } + TYPE.with(|t| { + t.get_or_init(|| { + // Full CPython layout: 9 sequence slots plus the two hidden + // named members, so `n_fields` is 11 and an 10/11-element + // constructor sequence fills `tm_zone`/`tm_gmtoff` + // positionally (test_structseq). + let slots: Vec> = STRUCT_TIME_FIELDS + .iter() + .map(|f| Some(*f)) + .chain([Some("tm_zone"), Some("tm_gmtoff")]) + .collect(); + crate::stdlib::os::struct_seq_type_layout("struct_time", "time", slots, 9) + }) + .clone() + }) } fn make_struct_time(values: Vec) -> Object { @@ -688,13 +700,10 @@ fn gettmarg(arg: Option<&Object>, func: &str) -> Result Some(Object::Tuple(t)) => t.to_vec(), Some(Object::Instance(inst)) => { let d = inst.dict_cell().borrow(); + let keys = crate::stdlib::os::static_name_keys(&STRUCT_TIME_FIELDS); let mut v = Vec::with_capacity(9); - for f in STRUCT_TIME_FIELDS { - v.push( - d.get(&DictKey(Object::from_static(f))) - .cloned() - .ok_or_else(illegal)?, - ); + for key in keys.iter() { + v.push(d.get(key).cloned().ok_or_else(illegal)?); } v } @@ -730,11 +739,11 @@ fn gettmarg(arg: Option<&Object>, func: &str) -> Result let (zone, gmtoff) = match arg { Some(Object::Instance(inst)) => { let d = inst.dict_cell().borrow(); - let zone = match d.get(&DictKey(Object::from_static("tm_zone"))) { + let zone = match d.get(&crate::stdlib::os::static_name_key("tm_zone")) { Some(z @ (Object::Str(_) | Object::WStr(_))) => Some(z.to_str()), _ => None, }; - let gmtoff = match d.get(&DictKey(Object::from_static("tm_gmtoff"))) { + let gmtoff = match d.get(&crate::stdlib::os::static_name_key("tm_gmtoff")) { Some(Object::Int(v)) => Some(*v), _ => None, }; @@ -888,6 +897,10 @@ fn time_strftime(args: &[Object]) -> Result { // code points into the PUA window — non-ASCII chars are copied through // verbatim (never handed to libc), then mapped back at the end. let cps = match args.first() { + // An ASCII format (the usual one) is its own bridge encoding. + Some(Object::Str(s)) if s.is_ascii() => { + return strftime_bridged(s.to_string(), args); + } Some(o @ (Object::Str(_) | Object::WStr(_))) => o.str_codepoints().unwrap_or_default(), Some(other) => { return Err(type_error(format!( @@ -897,7 +910,11 @@ fn time_strftime(args: &[Object]) -> Result { } None => return Err(type_error("strftime expects format string")), }; - let fmt = crate::builtins::bridge_encode_cps(&cps); + strftime_bridged(crate::builtins::bridge_encode_cps(&cps), args) +} + +/// `time.strftime` of the bridge-encoded format `fmt` (see `time_strftime`). +fn strftime_bridged(fmt: String, args: &[Object]) -> Result { let mut tm = match args.get(1) { None => localtime_now_tm()?, Some(o) => { @@ -933,6 +950,12 @@ fn time_strftime(args: &[Object]) -> Result { ctm.tm_zone = zone_c .as_ref() .map_or(std::ptr::null_mut(), |c| c.as_ptr().cast_mut()); + if fmt.bytes().all(|b| (1..=0x7f).contains(&b)) { + // One ASCII run: the whole format goes through libc. + let out = strftime_chunk(&fmt, &ctm); + drop(zone_c); + return Ok(crate::builtins::bridge_to_object(&out)); + } let chars: Vec = fmt.chars().collect(); let mut out = String::new(); let mut i = 0; @@ -1114,11 +1137,11 @@ fn with_tz_extras(obj: Object, gmtoff: i64, zone: &str) -> Object { if let Object::Instance(inst) = &obj { let mut d = inst.dict_cell().borrow_mut(); d.insert( - DictKey(Object::from_static("tm_gmtoff")), + crate::stdlib::os::static_name_key("tm_gmtoff"), Object::Int(gmtoff), ); d.insert( - DictKey(Object::from_static("tm_zone")), + crate::stdlib::os::static_name_key("tm_zone"), Object::from_str(zone.to_owned()), ); } diff --git a/crates/weavepy-vm/src/stdlib/warnings_mod.rs b/crates/weavepy-vm/src/stdlib/warnings_mod.rs index cde43e70..d2d28975 100644 --- a/crates/weavepy-vm/src/stdlib/warnings_mod.rs +++ b/crates/weavepy-vm/src/stdlib/warnings_mod.rs @@ -295,6 +295,20 @@ fn builtin_kw( /// named attribute — `get_warnings_attr` in `_warnings.c`. Attribute /// misses and import failures both come back as `None`; the caller falls /// back to the internal state. +/// Key strings the warning pipeline probes dicts with on every call, made +/// once so each probe reuses the string's memoized hash. +const K_VERSION: usize = 0; +const K_REGISTRY: usize = 1; +const K_NAME: usize = 2; +const K_WARNINGS: usize = 3; + +fn wkey(k: usize) -> &'static Object { + static KEYS: std::sync::OnceLock<[Object; 4]> = std::sync::OnceLock::new(); + &KEYS.get_or_init(|| { + ["version", "__warningregistry__", "__name__", "warnings"].map(Object::from_static) + })[k] +} + fn get_warnings_attr(attr: &str, try_import: bool) -> Option { let ip = interp().ok()?; let module = if try_import { @@ -303,7 +317,7 @@ fn get_warnings_attr(attr: &str, try_import: bool) -> Option { ip.module_cache() .modules .borrow() - .get(&StrKey("warnings")) + .get(&DictKey(wkey(K_WARNINGS).clone())) .cloned()? }; match &module { @@ -505,7 +519,7 @@ fn already_warned( should_set: bool, ) -> Result { let version = with_state(|st| st.filters_version); - let version_key = DictKey(Object::from_static("version")); + let version_key = DictKey(wkey(K_VERSION).clone()); let stale = match registry.borrow().get(&version_key) { Some(Object::Int(v)) => *v != version, _ => true, @@ -648,6 +662,13 @@ fn normalize_module(filename: &Object) -> Object { } } +/// `category(message)`: a fresh warning instance. +fn new_warning(category: &Object, message: &Object) -> Result { + let ip = interp()?; + let globals = ip.builtins_dict(); + ip.call_object_with_globals(category, &[message.clone()], &[], &globals) +} + fn is_warning_instance(obj: &Object) -> Option> { if let Object::Instance(inst) = obj { let warning = crate::builtin_types::builtin_types().warning.clone(); @@ -710,11 +731,14 @@ fn warn_explicit_locked( // Normalise: a Warning *instance* supplies both text (str(message)) // and category (its class); otherwise the message is the text and a - // fresh instance is built by calling the category. - let (text, message, category_cls) = match is_warning_instance(&message) { + // fresh instance is built by calling the category. A built-in + // category's instance is built only once something uses it (an + // ignored or already-issued warning never does): its construction + // runs no code anyone could observe. + let (text, instance, category_cls) = match is_warning_instance(&message) { Some(cls) => { let text = Object::from_str(interp()?.str_object(&message)?); - (text, message, cls) + (text, Some(message), cls) } None => { let Object::Type(cls) = &category else { @@ -724,13 +748,18 @@ fn warn_explicit_locked( ))); }; let cls = cls.clone(); - let ip = interp()?; - let globals = ip.builtins_dict(); - let instance = - ip.call_object_with_globals(&category, &[message.clone()], &[], &globals)?; - (message, instance, cls) + if cls.flags.is_builtin { + (message, None, cls) + } else { + let instance = new_warning(&category, &message)?; + (message, Some(instance), cls) + } } }; + let message = || match &instance { + Some(m) => Ok(m.clone()), + None => new_warning(&category, &text), + }; let key = Object::new_tuple_array([ text.clone(), @@ -747,7 +776,7 @@ fn warn_explicit_locked( let action = action_str(&action_obj).unwrap_or_default(); if action == "error" { - return Err(RuntimeError::PyException(PyException::new(message))); + return Err(RuntimeError::PyException(PyException::new(message()?))); } if action == "ignore" { return Ok(Object::None); @@ -799,7 +828,7 @@ fn warn_explicit_locked( call_show_warning( &category_cls, &text, - &message, + &message()?, filename, lineno, sourceline, @@ -947,63 +976,88 @@ fn is_internal_filename(filename: &str) -> bool { fn setup_context( stacklevel: i64, skip_file_prefixes: &[String], -) -> Result<(String, i64, Object, Object), RuntimeError> { - crate::builtins::sync_frame_spine(); +) -> Result<(Object, i64, Object, Object), RuntimeError> { // Per-thread frame stack, with the interpreter's own as a fallback // (shutdown finalizers run `__del__` without re-activating handles — // same fallback `sys._getframe` keeps). - let frames: Option = - match crate::vm_singletons::current_thread_handles() { - Some(h) => Some(h.frame_stack.clone()), - None => interp().ok().map(|ip| ip.frame_stack.clone()), - }; - // The walk only needs filename / lineno / globals, all present on - // the cheap shells — no `PyFrame` materialisation (RFC 0058). - let frame: Option> = frames.and_then(|fs| { - let stack = fs.borrow(); - if stack.is_empty() { - return None; + let frames: Option = crate::vm_singletons::current_frame_stack() + .or_else(|| interp().ok().map(|ip| ip.frame_stack.clone())); + // The walk only needs filename / lineno / globals: the running + // interpreter's whole stack (lean activations included) answers + // without pushing shells or materialising frames (RFC 0058); another + // stack's spine is made whole first. + let ip = interp().ok(); + let whole = match (&ip, &frames) { + (Some(ip), Some(fs)) if Rc::ptr_eq(&ip.frame_stack, fs) => true, + _ => { + crate::builtins::sync_frame_spine(); + false + } + }; + type Ctx = (Rc, u32, Rc>); + let at = |d: usize| -> Option { + if whole { + return ip.as_ref()?.frame_context_at(d); } - let is_internal = - |f: &Rc| is_internal_filename(&f.code.filename); - let to_skip = |f: &Rc| { - is_internal(f) + let fs = frames.as_ref()?; + let stack = fs.borrow(); + let shell = stack.get(stack.len().checked_sub(1 + d)?)?; + Some(( + (*shell.code).clone(), + shell.current_lineno(), + (*shell.globals).clone(), + )) + }; + let total = match (whole, &ip, &frames) { + (true, Some(ip), _) => ip.stack_depth(), + (_, _, Some(fs)) => fs.borrow().len(), + _ => 0, + }; + let is_internal = + |d: usize| at(d).is_some_and(|(code, _, _)| is_internal_filename(&code.filename)); + let to_skip = |d: usize| { + at(d).is_some_and(|(code, _, _)| { + is_internal_filename(&code.filename) || skip_file_prefixes .iter() - .any(|p| f.code.filename.starts_with(p.as_str())) - }; - let mut idx: isize = stack.len() as isize - 1; + .any(|p| code.filename.starts_with(p.as_str())) + }) + }; + let frame = if total == 0 { + None + } else { + let mut d = 0usize; let mut level = stacklevel; - if level <= 0 || is_internal(&stack[idx as usize]) { - while level > 1 && idx >= 0 { - idx -= 1; + if level <= 0 || is_internal(0) { + while level > 1 && d < total { + d += 1; level -= 1; } } else { - while level > 1 && idx >= 0 { + while level > 1 && d < total { // next_external_frame: hop to the next non-internal, // non-skipped frame. loop { - idx -= 1; - if idx < 0 || !to_skip(&stack[idx as usize]) { + d += 1; + if d >= total || !to_skip(d) { break; } } level -= 1; } } - if idx < 0 { + if d >= total { None } else { - Some(stack[idx as usize].clone()) + at(d) } - }); + }; let (globals, filename, lineno) = match frame { - Some(f) => { - let filename = f.code.filename.to_string(); - let lineno = i64::from(f.current_lineno()); - (f.globals.clone(), filename, lineno) + Some((code, line, globals)) => { + let filename = crate::builtins::code_synthetic_attr(&code, "co_filename") + .unwrap_or_else(|| Object::from_str(&*code.filename)); + (globals, filename, i64::from(line)) } None => { // Late-shutdown / no-frame warning: attributed to `:0`, @@ -1016,11 +1070,11 @@ fn setup_context( _ => Rc::new(RefCell::new(DictData::default())), } }; - (sysdict, "".to_owned(), 0) + (sysdict, Object::from_static(""), 0) } }; - let registry_key = DictKey(Object::from_static("__warningregistry__")); + let registry_key = DictKey(wkey(K_REGISTRY).clone()); let registry = match globals.borrow().get(®istry_key) { Some(r) => Some(r.clone()), None => None, @@ -1033,7 +1087,7 @@ fn setup_context( fresh } }; - let module = match globals.borrow().get(&StrKey("__name__")) { + let module = match globals.borrow().get(&DictKey(wkey(K_NAME).clone())) { Some(Object::None) | None => Object::from_static(""), Some(m) => m.clone(), }; @@ -1079,7 +1133,7 @@ fn warn_with_context( warn_explicit_core( Object::Type(category_cls), message, - &Object::from_str(filename), + &filename, lineno, Some(module), registry, diff --git a/crates/weavepy-vm/src/stdlib/weakref_real.rs b/crates/weavepy-vm/src/stdlib/weakref_real.rs index f7f5ef48..6295abcd 100644 --- a/crates/weavepy-vm/src/stdlib/weakref_real.rs +++ b/crates/weavepy-vm/src/stdlib/weakref_real.rs @@ -382,7 +382,7 @@ fn fq_type_name(target: &Object) -> String { fn referent_display_name(target: &Object) -> Option { match target { Object::Type(t) => Some(t.name.clone()), - Object::Function(f) => Some(f.name.clone()), + Object::Function(f) => Some(f.name.to_string()), Object::Module(m) => Some(m.name.clone()), Object::Instance(i) => match i.cls().lookup("__name__")? { Object::Str(s) => Some(s.to_string()), @@ -1189,6 +1189,7 @@ fn make_ref_object_with_class( finalize_ran: crate::sync::Cell::new(false), deferred: crate::sync::Cell::new(false), c_body: crate::types::CBody::default(), + gc_slot: crate::gc_trace::GcSlot::new(), }); // Back-pointer so `obj.__weakref__` / `getweakrefs(obj)` can return // this same wrapper object. @@ -1425,6 +1426,7 @@ mod tests { #[cfg(target_pointer_width = "64")] #[test] fn native_wrapper_storage_stays_authoritative_after_dict_materialization() { + let _gil = crate::gil::hold_gil(); let target = Object::Type( TypeObject::new_user("FixedWeakrefTarget", vec![], DictData::default()).unwrap(), ); @@ -1509,6 +1511,7 @@ mod tests { #[test] fn ref_returns_alive_target_then_none_after_clear() { + let _gil = crate::gil::hold_gil(); // Use a supported target: the unchecked string fixture can be // cleared by another test's weakref-only collection. let target = Object::Type( diff --git a/crates/weavepy-vm/src/stdlib/weave_frame_mod.rs b/crates/weavepy-vm/src/stdlib/weave_frame_mod.rs index f3129168..65eb4638 100644 --- a/crates/weavepy-vm/src/stdlib/weave_frame_mod.rs +++ b/crates/weavepy-vm/src/stdlib/weave_frame_mod.rs @@ -209,6 +209,7 @@ fn frame_new(args: &[Object]) -> Result { extra_locals: RefCell::new(None), cleared: Cell::new(false), lazy_back: RefCell::new(None), + live: std::sync::atomic::AtomicPtr::new(std::ptr::null_mut()), }); Ok(Object::Frame(frame)) } diff --git a/crates/weavepy-vm/src/sync.rs b/crates/weavepy-vm/src/sync.rs index 663a68b5..6d5b6376 100644 --- a/crates/weavepy-vm/src/sync.rs +++ b/crates/weavepy-vm/src/sync.rs @@ -416,15 +416,50 @@ pub(crate) fn cells_unguarded_flag() -> *const bool { CELLS_UNGUARDED.as_ptr() } +/// The flags a plain in-line release must find all clear (see +/// [`crate::plain_release_gate`]), side by side so that compiled code +/// tests them with one 32-bit load. +#[repr(C, align(4))] +pub(crate) struct ReleaseGates { + pub(crate) rc_shared: std::sync::atomic::AtomicBool, + pub(crate) dicts_watched: std::sync::atomic::AtomicBool, + pub(crate) funcs_watched: std::sync::atomic::AtomicBool, + pub(crate) reftrace_print: std::sync::atomic::AtomicBool, +} + +pub(crate) static RELEASE_GATES: ReleaseGates = ReleaseGates { + rc_shared: std::sync::atomic::AtomicBool::new(false), + dicts_watched: std::sync::atomic::AtomicBool::new(false), + funcs_watched: std::sync::atomic::AtomicBool::new(false), + reftrace_print: std::sync::atomic::AtomicBool::new(false), +}; + +/// The four [`RELEASE_GATES`] flags read with one 32-bit load, as compiled +/// code reads them (see [`crate::plain_release_gate`]): zero when a shared +/// value's release is a plain decrement. +#[inline(always)] +pub(crate) fn release_gates() -> u32 { + // SAFETY: `ReleaseGates` is four `AtomicBool`s, 4-aligned (`repr(C)`): + // its bytes are a valid `AtomicU32`, read (relaxed) as one word. + unsafe { + (*std::ptr::from_ref(&RELEASE_GATES).cast::()) + .load(Ordering::Relaxed) + } +} + +/// The [`release_gates`] bits of the release observers alone (every flag +/// but the reference-count bias's `rc_shared`). +pub(crate) const RELEASE_OBSERVER_GATES: u32 = u32::from_ne_bytes([0, 0xff, 0xff, 0xff]); + /// Whether reference counts must be updated atomically: set whenever the /// cell bias is revoked, and also before spawning a thread that may touch /// objects before it registers (see [`crate::rc`]). Never cleared. -static RC_SHARED: std::sync::atomic::AtomicBool = std::sync::atomic::AtomicBool::new(false); +static RC_SHARED: &std::sync::atomic::AtomicBool = &RELEASE_GATES.rc_shared; /// The flag [`bias_held`] reads (native code that takes references in /// line reads it too). pub(crate) fn rc_shared_flag() -> &'static std::sync::atomic::AtomicBool { - &RC_SHARED + RC_SHARED } /// True while one thread owns every reference count (see [`crate::rc`]). @@ -1986,6 +2021,11 @@ impl GilLock { self.0.try_lock() } + /// Whether the calling thread holds the lock. + pub fn is_owned_by_current_thread(&self) -> bool { + self.0.is_owned_by_current_thread() + } + pub fn try_lock_for( &self, timeout: std::time::Duration, diff --git a/crates/weavepy-vm/src/tier2.rs b/crates/weavepy-vm/src/tier2.rs index eac16025..308ce617 100644 --- a/crates/weavepy-vm/src/tier2.rs +++ b/crates/weavepy-vm/src/tier2.rs @@ -623,7 +623,7 @@ const CACHE_SWEEP_MIN: usize = 1024; /// cache that has grown to `sweep_at` entries first drops those of code /// objects that have died (see [`JitState::sweep_at`]). fn cache_entry<'a>( - cache: &'a mut CodeMap, + cache: &'a mut CodeMap>, sweep_at: &mut usize, code: &Rc, ) -> &'a mut CacheEntry { @@ -633,7 +633,7 @@ fn cache_entry<'a>( } cache .entry(Rc::as_ptr(code).cast::()) - .or_insert_with(|| CacheEntry::new(code)) + .or_insert_with(|| Box::new(CacheEntry::new(code))) } /// Give up on OSR for a code object after this many failed validations. @@ -800,7 +800,10 @@ struct JitState { threshold: u32, range_budget: bool, engine: Option, - cache: CodeMap, + /// Each code object's entry, boxed: every code object that runs gets + /// one, and an entry in line made each of the table's buckets (spare + /// ones included) as large as an entry. + cache: CodeMap>, /// The cache size at which [`cache_entry`] next sweeps out the /// entries of dead code objects (twice the live count the last sweep /// left, so sweeping stays amortized constant time per entry). @@ -823,12 +826,9 @@ struct JitState { static JIT_PROCESS_GATE: std::sync::atomic::AtomicU8 = std::sync::atomic::AtomicU8::new(0); /// Warm the code generator on a background thread (see -/// [`prewarm_codegen`]), once per process, when the first code object is -/// halfway to its compile threshold. Not at start-up: paging the code -/// generator in costs a program that never compiles anything about 2 MB -/// of resident memory (a third of an empty script's over CPython's), and -/// on the development host it slowed start-up more than it saved a short -/// hot loop's first compile. +/// [`prewarm_codegen`]), once per process: when start-up begins with the +/// JIT on (see [`prewarm_at_startup`]), or failing that when the first +/// code object is halfway to its compile threshold. fn spawn_codegen_prewarm() { static SPAWNED: std::sync::atomic::AtomicBool = std::sync::atomic::AtomicBool::new(false); if SPAWNED.swap(true, std::sync::atomic::Ordering::Relaxed) { @@ -844,6 +844,21 @@ fn spawn_codegen_prewarm() { } } +/// Start the code generator's warm-up as start-up begins, when the JIT may +/// run. A hot loop gets from its first iterations to its compile in far +/// less time than the warm-up takes (about 0.7 ms), so a warm-up started +/// on the way there leaves the first compile paying most of the cold start +/// on the thread that needs the code: short hot programs ran 6-11% slower +/// for it. On a background thread during start-up it costs the main thread +/// nothing; the price is the code generator's pages (about 2 MB resident) +/// in a process that never compiles, which start-up also paid when it +/// warmed the code generator itself. +pub(crate) fn prewarm_at_startup() { + if !jit_off_for_process() { + spawn_codegen_prewarm(); + } +} + /// The warm-up thread [`spawn_codegen_prewarm`] started, until joined. static PREWARM_THREAD: std::sync::Mutex>> = std::sync::Mutex::new(None); @@ -1067,32 +1082,14 @@ fn import_compilation_budget() -> bool { } /// Mark interpreter start-up finished (see [`STARTUP_DONE`]). +/// +/// The engine is still built at the first compile, not here: building it +/// and running a compile through it pages in about 1.4 MB of the code +/// generator, which a process that never compiles (a short script, most +/// imports) would carry for nothing, to save the first compile about a +/// millisecond. pub(crate) fn note_startup_finished() { STARTUP_DONE.store(true, std::sync::atomic::Ordering::Relaxed); - warm_engine(); -} - -/// Build this thread's engine and run one throwaway compile through it -/// (see [`JitEngine::warm_up`]) as start-up ends, when the JIT is on: the -/// first hot loop's compile then doesn't pay the code generator's cold -/// start inside the work it speeds up. -fn warm_engine() { - if jit_off_for_process() { - return; - } - JIT.with(|cell| { - let Ok(mut st) = cell.try_borrow_mut() else { - return; - }; - if !st.enabled || st.engine.is_some() { - return; - } - st.engine = JitEngine::new(); - match st.engine.as_mut() { - Some(engine) => engine.warm_up(), - None => st.enabled = false, - } - }); } /// Whether a code object whose counter reached `counter` against @@ -1113,6 +1110,39 @@ fn compile_allowed(counter: u32, threshold: u32) -> bool { /// attempt costs milliseconds. const IMPORT_THRESHOLD_FACTOR: u32 = 64; +/// The work at which the current phase admits compiling code whose +/// threshold is `threshold` (see [`compile_allowed`]). +fn admit_at(threshold: u32) -> u32 { + if compile_allowed(0, threshold) { + threshold + } else { + threshold.saturating_mul(IMPORT_THRESHOLD_FACTOR) + } +} + +/// Bodies longer than this many instructions need proportionally more +/// work before start-up or an import analyzes them (see +/// [`import_size_budget`]). +const IMPORT_LARGE_BODY: usize = 512; + +/// The counter a code object needs before tier 2 analyzes it, beyond +/// [`compile_allowed`]'s, when this phase admits compiles only at +/// `admit_at` (more than the threshold: start-up or an import). The +/// analysis of a body costs about its length (`import statistics`, whose +/// imports compile regular expressions, spent 12 ms and a sixth of its +/// instructions analyzing `re._parser._parse`'s 1,700 to reject them), +/// and import-time code mostly runs once per process, so a large body +/// needs work in proportion to its length; it can still compile at the +/// ordinary threshold once the imports are done. +fn import_size_budget(code: &CodeObject, admit_at: u32) -> u32 { + let len = code.instructions.len(); + if compile_allowed(0, 1) || len <= IMPORT_LARGE_BODY { + return 0; + } + let scale = u32::try_from(len / IMPORT_LARGE_BODY + 1).unwrap_or(u32::MAX); + admit_at.saturating_mul(scale) +} + /// [`compile_allowed`] for the frame compiler (see `frame_jit`), which /// keeps tier 2's start-up and import budgets. pub(crate) fn frame_compile_allowed(counter: u32, threshold: u32) -> bool { @@ -1326,11 +1356,21 @@ impl JitState { if entry_pc == 0 { entry.calls = entry.calls.wrapping_add(1); } - if entry.counter == self.threshold / 2 && self.engine.is_none() { + // Halfway to the work this phase admits a compile at + // (start-up and imports need far more first). (The + // phase is read only at the two counts it can be.) + let half = self.threshold / 2; + if (entry.counter == half + || entry.counter + == self.threshold.saturating_mul(IMPORT_THRESHOLD_FACTOR) / 2) + && entry.counter == admit_at(self.threshold) / 2 + && self.engine.is_none() + { spawn_codegen_prewarm(); } if entry.counter < self.threshold || !compile_allowed(entry.counter, self.threshold) + || entry.counter < import_size_budget(code, admit_at(self.threshold)) { return None; } @@ -1359,15 +1399,9 @@ impl JitState { long_calls = entry.backedges / calls >= LOOP_CALL_ITERATIONS; } // Threshold reached: compile (engine + cache borrowed disjointly). - if self.engine.is_none() { - self.engine = JitEngine::new(); - if self.engine.is_none() { - // Host ISA unavailable — disable so we stop retrying. - self.enabled = false; - return None; - } - } - let engine = self.engine.as_mut()?; + // The engine is built once an analysis admits some code (see + // `JitEngine::compile_frame_lazily`). + let engine = &mut self.engine; let VmProbes { resolve_obj, ret_lane_of, @@ -1690,7 +1724,8 @@ impl JitState { let mut slot_member = |site: &AttrSiteMeta| attr_guard_of(site).is_some_and(|g| g.slot_layout != 0); ensure_obj_layout(); - let r = engine.compile_frame_direct( + let r = JitEngine::compile_frame_lazily( + engine, code, &mut classify, &mut jit_probes, @@ -1716,6 +1751,14 @@ impl JitState { first } }; + if matches!( + res, + Err(weavepy_jit::JitVerdict::UnsupportedOpcode(why)) if why == weavepy_jit::NO_HOST_ENGINE + ) { + // Host ISA unavailable — disable so we stop retrying. + self.enabled = false; + return None; + } let (tier, out) = match res { Ok(cf) => { self.stats.frames_compiled += 1; @@ -2303,7 +2346,7 @@ fn ctor_field_plan(icode: &CodeObject) -> Option> { if recv.op != OpCode::LoadFast || recv.arg != 0 || store.op != OpCode::StoreAttr { return None; } - let name = icode.names.get(store.arg as usize)?.clone(); + let name = icode.names.get(store.arg as usize)?.to_string(); match fields.iter_mut().find(|(n, _)| *n == name) { Some(slot) => slot.1 = src, None => fields.push((name, src)), @@ -2486,7 +2529,10 @@ fn native_method_callable(cf: &CompiledFrame, code: &CodeObject) -> bool { } thread_local! { - static JIT: RefCell = RefCell::new(JitState::new()); + /// This thread's compiled code and its tables, which hold functions, + /// classes and constants: released under the GIL at thread exit. + static JIT: crate::gil::ReleaseUnderGil> = + crate::gil::ReleaseUnderGil::new(RefCell::new(JitState::new())); /// Memoized callee return typing (RFC 0059 WS3 / RFC 0069 WS1): /// `(scalar lane, provably-returns-None)`, keyed by code object @@ -3165,12 +3211,13 @@ fn attr_chain_step(obj: &Object, name: &str) -> Option { /// residue for locals bound from a live list's elements: the probe /// predicts from a representative, and the burned fingerprints /// re-validate per access). -fn walk_attr_path(frame: &super::Frame, slot: u32, path: &[String]) -> Option { +fn walk_attr_path>(frame: &super::Frame, slot: u32, path: &[S]) -> Option { let mut cur = { let locals = frame.locals.borrow(); locals.get(slot as usize)?.clone() }; for name in path { + let name = name.as_ref(); if name == weavepy_jit::ELEM_SENTINEL { cur = exemplar_element(&cur)?; continue; @@ -4029,7 +4076,7 @@ fn inline_fields_of(recv: &Object, code: &CodeObject, ver: u64) -> Vec continue, }; out.push(InlineField { - name: name.clone(), + name: name.to_string(), lane, at, }); @@ -4667,6 +4714,10 @@ struct CallCtx { /// activation shell the inspection found (a framed activation's are /// its frame's own). inspected_locals: std::cell::RefCell>>>>, + /// A frameless activation's frame object, made for its activation + /// shell while a call ran (`sys._getframe()`): the interpreter + /// continuation adopts it (see [`call_with_activation_shell`]). + inspected_frame: std::cell::RefCell>>, } /// A framed native activation running on this thread, registered so @@ -5862,7 +5913,7 @@ unsafe fn call_py_with_gaps( if kwargs.is_empty() && args.len() == j { args.push(v); } else if let Some(name) = code.varnames.get(j) { - kwargs.push((name.clone(), v)); + kwargs.push((name.to_string(), v)); } } let res = call_with_activation_shell(interp, ctx, jf, |i| { @@ -6287,6 +6338,18 @@ unsafe fn try_native_call( } child.pins.clear(); ctx.child = Some(child); + // An argument the callee held last died with its pins: the + // caller leaves native code after the call, so the queued + // finalizer runs before its next instruction, as the + // interpreter's own call runs it. + if finalizer_queued() { + ctx.parked = Some(match expect { + SlotTag::Int | SlotTag::Float | SlotTag::Bool => unpack(bits, expect_tag), + SlotTag::ObjPin if bits != u64::MAX => unpack_pins(bits, expect_tag, &ctx.pins), + _ => Object::None, + }); + return Some(CallStatus::Boxed as i64); + } jf.ret_bits = bits; jf.ret_tag = expect_tag; return Some(CallStatus::Ok as i64); @@ -6463,6 +6526,7 @@ fn fresh_child(ctx: &CallCtx, nc: &NativeCallee, callee_key: *const CodeObject) pin_memo: [u32::MAX; PIN_MEMO], introspected: Cell::new(false), inspected_locals: std::cell::RefCell::new(None), + inspected_frame: std::cell::RefCell::new(None), cell_list_pins: Vec::new(), }) } @@ -6589,6 +6653,19 @@ unsafe fn finish_native_call( } ctx.child = Some(child); ctx.dirty |= child_dirty; + // A finalizer the callee's releases queued runs before the caller's + // next instruction: the caller leaves native code after the call. + if finalizer_queued() { + match done { + Done::Raised(e) => { + ctx.raised = Some(e); + return CallStatus::Raised as i64; + } + Done::Scalar(bits, tag) => ctx.parked = Some(unpack(bits, tag)), + Done::Obj(v) => ctx.parked = Some(v), + } + return CallStatus::Boxed as i64; + } match done { Done::Raised(e) => { @@ -6840,9 +6917,23 @@ fn finish_deopted( // An inspected activation's shell holds its locals, plus whatever the // inspection wrote (see `sync_native_locals`). let inspected = nctx.inspected_locals.borrow_mut().take(); + // A frame object made for the activation's shell stands for this + // frame: the frame runs on in it, on the storage its `f_locals` reads. + let adopted = nctx.inspected_frame.borrow_mut().take(); + let mut shared_locals = None; if let Some(shell) = inspected.filter(|_| nctx.introspected.get()) { - locals_v.extend(shell.borrow().iter().take(n_real).cloned()); - locals_v.resize(n_real, Object::Unbound); + if adopted.as_ref().is_some_and(|py| { + py.locals_mirror + .borrow() + .as_ref() + .is_some_and(|m| Rc::ptr_eq(m, &shell)) + }) { + shell.borrow_mut().resize(n_real, Object::Unbound); + shared_locals = Some(shell); + } else { + locals_v.extend(shell.borrow().iter().take(n_real).cloned()); + locals_v.resize(n_real, Object::Unbound); + } } else { for slot in 0..n_real { match entry.cf.local_types.get(slot).copied().flatten() { @@ -6855,9 +6946,10 @@ fn finish_deopted( } } } + let py_frame = shared_locals.as_ref().and(adopted); let mut frame = super::Frame { code: code.clone(), - locals: Rc::new(GilRefCell::new(locals_v)), + locals: shared_locals.unwrap_or_else(|| Rc::new(GilRefCell::new(locals_v))), cells: crate::object::empty_cells(), stack: Vec::new(), globals: func.globals.clone(), @@ -6866,7 +6958,7 @@ fn finish_deopted( exc: None, agen_yielded_value: true, pc: 0, - py_frame: None, + py_frame, gen_owner: None, suppress_call_event: true, gen_first_resume: false, @@ -6930,6 +7022,17 @@ fn call_with_activation_shell( f: impl FnOnce(&mut super::Interpreter) -> T, ) -> T { let Some(code) = &ctx.frameless_code else { + // A framed activation's shell is the spine's top while its native + // code runs: the call site becomes its `f_lineno`, as the + // interpreter's own call would record it. + if let Ok(stack) = interp.frame_stack.try_borrow() { + if let Some(top) = stack.last() { + if std::ptr::eq(Rc::as_ptr(&*top.code), ctx.code_ptr) { + top.lasti + .store(jf.deopt_pc, std::sync::atomic::Ordering::Relaxed); + } + } + } return f(interp); }; let shell_locals = Rc::new(GilRefCell::new(Vec::new())); @@ -6949,9 +7052,26 @@ fn call_with_activation_shell( materialized: GilRefCell::new(None), tb_refs: std::sync::atomic::AtomicU32::new(0), }); - interp.frame_stack.borrow_mut().push(shell); + interp.frame_stack.borrow_mut().push(shell.clone()); // Inspection of the shell's frame finds this activation's locals. - let out = with_native_frame(&shell_locals, jf, || f(interp)); + let out = with_native_frame(&shell_locals, jf, || { + let out = f(interp); + // The call made the activation's frame object (`sys._getframe()` + // in a callee, or the native code's own call of it): one object + // stands for the activation from now on, so the rest of it runs + // in the interpreter (the inspection mark ends the native run + // after this call), whose frame adopts the object and these + // locals (see `finish_deopted`). + // (An inspection of its `f_locals` synced them already, and may + // have written them since.) + if let Some(py) = shell.materialized.borrow().as_ref() { + if !ctx.introspected.get() { + sync_native_locals(&shell_locals); + } + *ctx.inspected_frame.borrow_mut() = Some(py.clone()); + } + out + }); // The general pop: a traceback entry or a callee frame's `f_back` may // hold the shell lazily, and gets its frame object on the way out. interp.pop_frame_shell(); @@ -10352,6 +10472,7 @@ mod scalar_update_guard_tests { #[test] fn mutable_descriptor_classes_never_certify_an_update() { + let _gil = crate::gil::hold_gil(); let object = crate::builtin_types::builtin_types().object_.clone(); let descriptor_type = TypeObject::new_user("MutableValue", vec![object.clone()], DictData::default()) @@ -10422,6 +10543,7 @@ mod attr_pin_tests { #[test] fn stale_hints_check_the_current_activation_and_object_identity() { + let _gil = crate::gil::hold_gil(); let class = TypeObject::new_user("PinValue", vec![], DictData::default()).unwrap(); let a = Object::Instance(Rc::new(crate::types::PyInstance::new(class.clone()))); let b = Object::Instance(Rc::new(crate::types::PyInstance::new(class))); @@ -10873,11 +10995,7 @@ unsafe fn cached_chain_peek<'a>( .or_else(|| slots.get(name.as_ref())) } _ => { - let index = extension - .attr_poly - .get()? - .get(pc as usize)? - .index(version)?; + let index = extension.attr_poly_slot(pc as usize)?.index(version)?; // SAFETY: the same callback-free, rooted interval. let (key, value) = unsafe { inst.attr_peek_index(index as usize) }?; key_is(key, name).then_some(value) @@ -11207,9 +11325,6 @@ unsafe extern "C" fn wpjit_attr_set(frame: *mut JitFrame, pin: i64, site: i64) - // execution. Watched instance dicts deopt so the generic path // fires the exact watcher events. AttrStorage::NewKey => { - use indexmap::map::raw_entry_v1::{RawEntryApiV1, RawEntryMut}; - use std::hash::BuildHasher; - if crate::capi_watchers::dicts_active() { return 1; } @@ -11238,25 +11353,22 @@ unsafe extern "C" fn wpjit_attr_set(frame: *mut JitFrame, pin: i64, site: i64) - &mut **dict }; let probe = crate::object::LeafNameProbe::new(&g.name, g.name_hash); - let hash = crate::fasthash::FxBuildHasher.hash_one(g.name_hash); - let entry = dict - .raw_entry_mut_v1() - .from_key_hashed_nocheck(hash, &probe); + let entry = dict.probe_entry(&probe); // A hash-colliding user key could run Python during equality. // Resume before the store so the interpreter owns that callback. if probe.saw_exotic() { return 1; } let old = match entry { - RawEntryMut::Occupied(mut entry) => { + crate::dictmap::ProbeEntry::Occupied(mut entry) => { let dst = entry.get_mut(); // The displaced-value discipline of the indexed arm. Some(std::mem::replace(dst, v)) } - RawEntryMut::Vacant(entry) => { + crate::dictmap::ProbeEntry::Vacant(entry) => { // The guard already owns the interned key. Reuse the - // probe's hash and vacant entry instead of probing again. - entry.insert_hashed_nocheck(hash, DictKey(Object::Str(g.name.clone())), v); + // probe's hash and vacant slot instead of probing again. + entry.insert(DictKey(Object::Str(g.name.clone())), v); None } }; @@ -13767,6 +13879,7 @@ pub(crate) fn try_call_native_direct( pin_memo: [u32::MAX; PIN_MEMO], introspected: Cell::new(false), inspected_locals: std::cell::RefCell::new(None), + inspected_frame: std::cell::RefCell::new(None), cell_list_pins: Vec::new(), }; let mut jf = JitFrame { @@ -14724,6 +14837,7 @@ fn enter_compiled( pin_memo: [u32::MAX; PIN_MEMO], introspected: Cell::new(false), inspected_locals: std::cell::RefCell::new(None), + inspected_frame: std::cell::RefCell::new(None), cell_list_pins: Vec::new(), }; let mut jf = JitFrame { @@ -15645,6 +15759,7 @@ fn resume_parked(interp: &mut super::Interpreter, frame: &mut super::Frame) -> J pin_memo: [u32::MAX; PIN_MEMO], introspected: Cell::new(false), inspected_locals: std::cell::RefCell::new(None), + inspected_frame: std::cell::RefCell::new(None), cell_list_pins: Vec::new(), }; let mut jf = JitFrame { @@ -15939,6 +16054,7 @@ mod native_pair_tests { #[test] fn shares_cursors_with_interpreted_steps_and_stays_exhausted() { + let _gil = crate::gil::hold_gil(); let (outer, inner) = enumeration(&[10, 20, 30], -2); assert!(matches!( inner.borrow_mut().next_value(), @@ -15967,6 +16083,7 @@ mod native_pair_tests { #[test] fn counter_overflow_leaves_the_value_for_generic_promotion() { + let _gil = crate::gil::hold_gil(); let (outer, inner) = enumeration(&[11, 22, 33], i64::MAX - 1); assert_eq!( next_enumerated_byte(&outer), @@ -15996,6 +16113,7 @@ mod native_pair_tests { #[test] fn unsupported_sources_do_not_advance_either_cursor() { + let _gil = crate::gil::hold_gil(); let inner = Rc::new(RefCell::new(PyIterator::Bytes { data: crate::shared_value::SharedSlice::from([42_u8].as_slice()), index: 0, @@ -16026,6 +16144,7 @@ mod native_pair_tests { #[test] fn a_live_borrow_does_not_consume_a_byte() { + let _gil = crate::gil::hold_gil(); let (outer, inner) = enumeration(&[42], 0); let borrowed = inner.borrow(); assert_eq!(next_enumerated_byte(&outer), NativeBytePair::Unsupported); @@ -16048,6 +16167,7 @@ mod native_pair_tests { #[test] fn tuple_pairs_preserve_identity_shared_cursors_and_exhaustion() { + let _gil = crate::gil::hold_gil(); let value = Object::from_str("retained value"); let (outer, inner) = tuple_enumeration(vec![Object::Int(5), value.clone(), Object::None], -2); @@ -16084,6 +16204,7 @@ mod native_pair_tests { #[test] fn tuple_pin_pressure_preserves_values_and_allows_none() { + let _gil = crate::gil::hold_gil(); let (outer, inner) = tuple_enumeration(vec![Object::Int(42), Object::None], 0); assert!(matches!( next_enumerated_tuple(&outer, false), @@ -16109,6 +16230,7 @@ mod native_pair_tests { #[test] fn tuple_mutable_values_and_counter_overflow_keep_generic_continuations() { + let _gil = crate::gil::hold_gil(); let mutable = Object::List(Rc::new(RefCell::new(vec![Object::Int(1)]))); let (outer, inner) = tuple_enumeration(vec![mutable.clone(), Object::Int(7)], 7); assert!(matches!( @@ -16165,6 +16287,7 @@ mod native_pair_tests { #[test] fn tuple_borrows_and_wrappers_do_not_consume_values() { + let _gil = crate::gil::hold_gil(); let (outer, inner) = tuple_enumeration(vec![Object::Int(42)], 0); let borrowed = inner.borrow(); assert!(matches!( diff --git a/crates/weavepy-vm/src/trace.rs b/crates/weavepy-vm/src/trace.rs index 17d15409..d901f7ba 100644 --- a/crates/weavepy-vm/src/trace.rs +++ b/crates/weavepy-vm/src/trace.rs @@ -482,11 +482,15 @@ static EVAL_FRAME_RECORD: Mutex> = Mutex::new(None); pub fn set_eval_frame_record(list: Object) { *EVAL_FRAME_RECORD.lock().unwrap() = Some(list); EVAL_FRAME_RECORD_ACTIVE.store(true, Ordering::Release); + // A running burst's direct calls test the gate once per burst (see + // `CoreSwitch::calls_ok`): the new generation ends it. + crate::hot_gates::bump_loop_gen(); } pub fn set_eval_frame_default() { EVAL_FRAME_RECORD_ACTIVE.store(false, Ordering::Release); *EVAL_FRAME_RECORD.lock().unwrap() = None; + crate::hot_gates::bump_loop_gen(); } #[inline] diff --git a/crates/weavepy-vm/src/type_surface.rs b/crates/weavepy-vm/src/type_surface.rs index 6da30d77..56231afb 100644 --- a/crates/weavepy-vm/src/type_surface.rs +++ b/crates/weavepy-vm/src/type_surface.rs @@ -1179,6 +1179,30 @@ fn as_native(o: &Object) -> Object { o.clone() } +/// `body` on `args` with `recv` in place of the first: the other +/// arguments as bitwise views (never dropped: `args` keeps them alive, and +/// a body clones what it keeps), without allocating for the usual few. +fn with_receiver(args: &[Object], recv: Object, body: impl FnOnce(&[Object]) -> R) -> R { + const N: usize = 8; + if args.len() > N { + let mut v = args.to_vec(); + v[0] = recv; + return body(&v); + } + let mut buf = [const { std::mem::MaybeUninit::::uninit() }; N]; + buf[0].write(recv); + for (slot, a) in buf[1..].iter_mut().zip(&args[1..]) { + // SAFETY: a view of a live argument, never dropped. + slot.write(unsafe { std::ptr::read(a) }); + } + // SAFETY: the first `args.len()` entries were written. + let view = unsafe { std::slice::from_raw_parts(buf.as_ptr().cast::(), args.len()) }; + let r = body(view); + // SAFETY: the receiver is the one owned entry. + unsafe { buf[0].assume_init_drop() }; + r +} + /// Wrap a `lookup_method`-table builtin so an `Instance` receiver /// (built-in subclass) is unwrapped to its native payload before the /// underlying implementation runs. @@ -1199,6 +1223,17 @@ fn unwrap_shim(inner: Rc, owner: &Rc) -> Object { owner: &crate::sync::Weak, first: &Object, ) -> Result<(), RuntimeError> { + // An instance (a subclass's) of the owner, its class borrowed: the + // commonest receiver here. (A live weak handle keeps its + // allocation, so the owner's address names it.) + if let Object::Instance(inst) = first { + let cls = inst.class.borrow(); + if std::ptr::eq(Rc::as_ptr(&cls), owner.as_ptr()) + || owner.upgrade().is_some_and(|o| cls.is_subclass_of(&o)) + { + return Ok(()); + } + } if let Some(owner) = owner.upgrade() { let cls = crate::builtins::class_of(first); if !cls.is_subclass_of(&owner) { @@ -1235,9 +1270,7 @@ fn unwrap_shim(inner: Rc, owner: &Rc) -> Object { if !keep_instance { let unwrapped = as_native(first); if !unwrapped.is_same(first) { - let mut v = args.to_vec(); - v[0] = unwrapped; - return (inner_pos.call)(&v); + return with_receiver(args, unwrapped, |v| (inner_pos.call)(v)); } } } @@ -1258,9 +1291,7 @@ fn unwrap_shim(inner: Rc, owner: &Rc) -> Object { } let unwrapped = as_native(first); if !unwrapped.is_same(first) { - let mut v = args.to_vec(); - v[0] = unwrapped; - return kw(&v, kwargs); + return with_receiver(args, unwrapped, |v| kw(v, kwargs)); } } kw(args, kwargs) @@ -1608,7 +1639,7 @@ fn set_like(model: &Object, items: Vec) -> Object { /// bpo-46615 regression tests, can re-enter and `clear()` the operands) /// *without* holding a borrow on any live `Object::Set` cell. We snapshot /// the elements out under a short-lived borrow (`set_items`) and rebuild a -/// detached `IndexSet`, so a re-entrant mutation touches a cell we are no +/// detached set table, so a re-entrant mutation touches a cell we are no /// longer borrowing instead of panicking with `BorrowMutError`. fn snapshot_set(o: &Object) -> crate::object::SetData { let mut out = crate::object::SetData::default(); diff --git a/crates/weavepy-vm/src/types.rs b/crates/weavepy-vm/src/types.rs index f3cc4009..390614d3 100644 --- a/crates/weavepy-vm/src/types.rs +++ b/crates/weavepy-vm/src/types.rs @@ -51,10 +51,11 @@ pub enum Dunder { Call, Set, Delete, + Class, } impl Dunder { - pub const COUNT: usize = 11; + pub const COUNT: usize = 12; pub const fn name(self) -> &'static str { match self { @@ -69,6 +70,7 @@ impl Dunder { Self::Call => "__call__", Self::Set => "__set__", Self::Delete => "__delete__", + Self::Class => "__class__", } } } @@ -144,6 +146,38 @@ impl DunderInfo { } } +/// The questions [`TypeObject::memo_verdict`] memoizes per class. +#[derive(Clone, Copy, Debug, PartialEq, Eq)] +#[repr(u8)] +pub(crate) enum Verdict { + /// An instance attribute `name` that no class-level source supplies + /// (see `attr_certainly_missing`). + AttrMissing = 1, + /// The class reduces as `copyreg._reduce_newobj` would for a plain + /// instance (see `Interpreter::reduce_newobj_plain`); `name` unused. + PlainNewobj = 2, + /// A builtin class's own dict has no class method `name` (see + /// `Interpreter::leaf_load_type_attr`). + NoNativeClassMethod = 3, + /// No builtin base on the class's MRO supplies a slot wrapper or a + /// type-dict entry `name` (see `builtin_slot_wrapper`). + NoSlotWrapper = 4, + /// An instance store of `name` is a plain instance-dict store: default + /// attribute access and setting, and no class attribute in the way + /// but a function or a plain value (see `Interpreter::leaf_store_attr`). + PlainStore = 5, + /// A builtin class answered `name` with `AttributeError` (recorded + /// after the lookup, for `hasattr`; asyncio's `isfuture` asks + /// `hasattr(type(coro), '_asyncio_future_blocking')` for every + /// coroutine it is handed). See [`TypeObject::verdict_record`]. + TypeAttrMissing = 6, + /// A value of the builtin class (one whose attributes all come from + /// the class, see `builtin_value_class`) answered `name` with + /// `AttributeError`: enum asks `hasattr(value, '__get__')` of every + /// member value. Recorded like [`Self::TypeAttrMissing`]. + ValueAttrMissing = 7, +} + pub struct AttrVersion(std::sync::atomic::AtomicU64); impl AttrVersion { @@ -266,7 +300,6 @@ mod attr_version_tests { /// whose hash and length happen to collide. pub(crate) mod type_cache { use std::cell::RefCell; - use std::hash::Hasher; use std::rc::Rc; /// Entries per thread (CPython's `MCACHE_SIZE_EXP` is 12 too). The @@ -305,11 +338,61 @@ pub(crate) mod type_cache { Absent, } + /// A slot hash for `name` from its length and at most its first and + /// last eight bytes: constant time for any name (entries still + /// compare the whole name), and attribute names differ there. #[inline] pub(crate) fn name_hash(name: &str) -> u64 { - let mut h = crate::fasthash::FxHasher::default(); - h.write(name.as_bytes()); - h.finish() + let b = name.as_bytes(); + let n = b.len(); + let (head, tail) = if n >= 8 { + ( + u64::from_le_bytes(b[..8].try_into().expect("8 bytes")), + u64::from_le_bytes(b[n - 8..].try_into().expect("8 bytes")), + ) + } else { + (short_word(b), 0) + }; + let x = (head ^ tail.rotate_left(29) ^ (n as u64)).wrapping_mul(0x9E37_79B9_7F4A_7C15); + x ^ (x >> 29) + } + + /// The bytes of a name shorter than eight bytes as one word, from two + /// overlapping loads that together cover it (so two names of the same + /// length are equal exactly when their words are). + #[inline(always)] + fn short_word(b: &[u8]) -> u64 { + let n = b.len(); + if n >= 4 { + let lo = u32::from_le_bytes(b[..4].try_into().expect("4 bytes")); + let hi = u32::from_le_bytes(b[n - 4..].try_into().expect("4 bytes")); + u64::from(lo) | u64::from(hi) << 32 + } else if n >= 2 { + let lo = u16::from_le_bytes(b[..2].try_into().expect("2 bytes")); + let hi = u16::from_le_bytes(b[n - 2..].try_into().expect("2 bytes")); + u64::from(lo) | u64::from(hi) << 16 + } else { + b.first().map_or(0, |&c| u64::from(c)) + } + } + + /// `a == b` for attribute names, in line for the short ones (most + /// dunders and identifiers fit in sixteen bytes). + #[inline] + pub(crate) fn name_eq(a: &str, b: &str) -> bool { + let (a, b) = (a.as_bytes(), b.as_bytes()); + let n = a.len(); + if n != b.len() { + return false; + } + if n > 16 { + return a == b; + } + let w = |s: &[u8], at: usize| u64::from_le_bytes(s[at..at + 8].try_into().expect("8")); + if n >= 8 { + return w(a, 0) == w(b, 0) && w(a, n - 8) == w(b, n - 8); + } + short_word(a) == short_word(b) } #[inline] @@ -327,7 +410,7 @@ pub(crate) mod type_cache { let c = c.try_borrow().ok()?; let table = c.as_ref()?; let e = &table[slot(ty, ver, name_hash)]; - if e.ver == ver && e.name.as_deref() == Some(name) { + if e.ver == ver && e.name.as_deref().is_some_and(|n| name_eq(n, name)) { Some(if e.mro_idx == ABSENT { Hit::Absent } else { @@ -432,12 +515,24 @@ pub(crate) mod type_cache { /// address and the class's attribute version. A small direct-mapped /// cache per class: polymorphic sites (one receiver class per iteration) /// find every class's answer here with no site cache at all. Storage is -/// allocated on the first fill; unused classes occupy only one pointer. +/// allocated on the first fill, [`LEAF_ATTRS_SMALL`] entries at first and +/// [`LEAF_ATTRS_LARGE`] once two names compete for a full slot pair (most +/// classes answer only a few names); unused classes occupy only one +/// pointer. /// /// Read and written only from the dispatch loop with the GIL held (the /// burst is off in free-threaded mode), like the dispatch loop's other -/// side caches. -pub struct LeafAttrCache(std::cell::UnsafeCell>>); +/// side caches. A reference [`LeafAttrCache::get`] returns must not be +/// held across a [`LeafAttrCache::set`], which may move the entries. +pub struct LeafAttrCache(std::cell::Cell); + +/// The entries a class's first [`LeafAttrCache`] fill allocates. +const LEAF_ATTRS_SMALL: usize = 8; +/// The entries a [`LeafAttrCache`] grows to. +const LEAF_ATTRS_LARGE: usize = 32; +/// The tag bit of a [`LeafAttrCache`]'s table address that marks a +/// table of [`LEAF_ATTRS_SMALL`] entries (entries are word-aligned). +const LEAF_ATTRS_SMALL_TAG: usize = 1; // SAFETY: see the type docs — GIL-serialized access from one thread at a // time, never across a Python call. @@ -502,7 +597,85 @@ pub enum LeafAttrKind { impl LeafAttrCache { pub fn new() -> Self { - Self(std::cell::UnsafeCell::new(None)) + Self(std::cell::Cell::new(0)) + } + + /// The table, if one was allocated. + #[cfg(test)] + fn table(&self) -> Option<&[LeafAttrEntry]> { + let t = self.0.get(); + if t == 0 { + return None; + } + let len = if t & LEAF_ATTRS_SMALL_TAG != 0 { + LEAF_ATTRS_SMALL + } else { + LEAF_ATTRS_LARGE + }; + // SAFETY: a nonzero address (tag removed) is a live table of `len` + // entries; GIL-serialized, and no `&mut` escapes `set`. + Some(unsafe { + std::slice::from_raw_parts((t & !LEAF_ATTRS_SMALL_TAG) as *const LeafAttrEntry, len) + }) + } + + /// The table for writing, allocated (small) on first use. + #[allow(clippy::mut_from_ref)] + fn table_mut(&self) -> &mut [LeafAttrEntry] { + if self.0.get() == 0 { + let t: Box<[LeafAttrEntry; LEAF_ATTRS_SMALL]> = + Box::new(std::array::from_fn(|_| LeafAttrEntry::EMPTY)); + self.0.set(Box::into_raw(t) as usize | LEAF_ATTRS_SMALL_TAG); + } + let t = self.0.get(); + let len = if t & LEAF_ATTRS_SMALL_TAG != 0 { + LEAF_ATTRS_SMALL + } else { + LEAF_ATTRS_LARGE + }; + // SAFETY: as `table`; the exclusive reference lives only for the + // caller's update. + unsafe { + std::slice::from_raw_parts_mut((t & !LEAF_ATTRS_SMALL_TAG) as *mut LeafAttrEntry, len) + } + } + + /// Release the table, leaving none. + fn free(&self) { + let t = self.0.replace(0); + if t == 0 { + return; + } + let p = t & !LEAF_ATTRS_SMALL_TAG; + // SAFETY: the table was allocated as this boxed array (see + // `table_mut` and `grow`) and is no longer reachable. + unsafe { + if t & LEAF_ATTRS_SMALL_TAG != 0 { + drop(Box::from_raw(p as *mut [LeafAttrEntry; LEAF_ATTRS_SMALL])); + } else { + drop(Box::from_raw(p as *mut [LeafAttrEntry; LEAF_ATTRS_LARGE])); + } + } + } + + /// Move a small table's entries into a large one. + #[cold] + fn grow(&self) { + let mut large: Box<[LeafAttrEntry; LEAF_ATTRS_LARGE]> = + Box::new(std::array::from_fn(|_| LeafAttrEntry::EMPTY)); + for e in self.table_mut() { + let e = std::mem::replace(e, LeafAttrEntry::EMPTY); + if e.name == 0 { + continue; + } + let (i, j) = (Self::index(e.name), Self::alt(e.name)); + let k = if large[i].name == 0 { i } else { j }; + if large[k].name == 0 { + large[k] = e; + } + } + self.free(); + self.0.set(Box::into_raw(large) as usize); } #[inline] @@ -521,37 +694,63 @@ impl LeafAttrCache { /// The cached kind for `name` under `ver`, if present. #[inline] pub fn get(&self, name: usize, ver: u64) -> Option<&LeafAttrKind> { - // SAFETY: GIL-serialized; no `&mut` escapes `set`. - let t = unsafe { &*self.0.get() }.as_deref()?; - let e = &t[Self::index(name)]; + let t = self.0.get(); + if t == 0 { + return None; + } + // (Both table lengths are powers of two.) + let mask = if t & LEAF_ATTRS_SMALL_TAG != 0 { + LEAF_ATTRS_SMALL - 1 + } else { + LEAF_ATTRS_LARGE - 1 + }; + let base = (t & !LEAF_ATTRS_SMALL_TAG) as *const LeafAttrEntry; + // SAFETY: a nonzero address (tag removed) is a live table of + // `mask + 1` entries, indexed below within the mask; GIL-serialized, + // and no `&mut` escapes `set`. + let e = unsafe { &*base.add(Self::index(name) & mask) }; if e.name == name && e.ver == ver { return Some(&e.kind); } - let e = &t[Self::alt(name)]; + // SAFETY: as above. + let e = unsafe { &*base.add(Self::alt(name) & mask) }; (e.name == name && e.ver == ver).then_some(&e.kind) } #[inline] pub fn set(&self, name: usize, ver: u64, kind: LeafAttrKind) { - // SAFETY: GIL-serialized; the exclusive reference lives only for - // the assignment. - let t = unsafe { &mut *self.0.get() }.get_or_insert_with(|| { - Box::new(std::array::from_fn(|_| LeafAttrEntry { - name: 0, - ver: 0, - kind: LeafAttrKind::Other, - })) - }); - let (i, j) = (Self::index(name), Self::alt(name)); // The first slot unless it holds another name that is still // current; then the second, unless that one is too (evict the - // first). + // first, or grow a small table instead). let busy = |e: &LeafAttrEntry| e.name != 0 && e.name != name && e.ver == ver; + let mut t = self.table_mut(); + let mut mask = t.len() - 1; + let (i, j) = (Self::index(name), Self::alt(name)); + if t.len() == LEAF_ATTRS_SMALL && busy(&t[i & mask]) && busy(&t[j & mask]) { + self.grow(); + t = self.table_mut(); + mask = t.len() - 1; + } + let (i, j) = (i & mask, j & mask); let k = if !busy(&t[i]) || busy(&t[j]) { i } else { j }; t[k] = LeafAttrEntry { name, ver, kind }; } } +impl LeafAttrEntry { + const EMPTY: LeafAttrEntry = LeafAttrEntry { + name: 0, + ver: 0, + kind: LeafAttrKind::Other, + }; +} + +impl Drop for LeafAttrCache { + fn drop(&mut self) { + self.free(); + } +} + impl Default for LeafAttrCache { fn default() -> Self { Self::new() @@ -572,22 +771,61 @@ impl std::fmt::Debug for LeafAttrCache { #[cfg(test)] mod leaf_attr_cache_tests { - use super::{LeafAttrCache, LeafAttrKind}; + use super::{LeafAttrCache, LeafAttrKind, LEAF_ATTRS_LARGE, LEAF_ATTRS_SMALL}; use crate::object::Object; use crate::shared_value::SharedStr; + #[test] + fn small_table_grows_when_names_compete_and_keeps_values() { + let cache = LeafAttrCache::new(); + let text = SharedStr::from("moved value"); + let first = 16; + cache.set(first, 1, LeafAttrKind::Value(Object::Str(text.clone()))); + assert_eq!(cache.table().map(<[_]>::len), Some(LEAF_ATTRS_SMALL)); + // Two names sharing `first`'s slot pair in the small table, but + // neither of its slot in the large one. + let small = |n: usize| { + ( + LeafAttrCache::index(n) % LEAF_ATTRS_SMALL, + LeafAttrCache::alt(n) % LEAF_ATTRS_SMALL, + ) + }; + let home = LeafAttrCache::index(first); + let rivals: Vec = (17..1_000_000) + .filter(|&n| { + small(n) == small(first) + && LeafAttrCache::index(n) != home + && LeafAttrCache::alt(n) != home + }) + .take(2) + .collect(); + cache.set(rivals[0], 1, LeafAttrKind::InstanceOnly); + assert_eq!(cache.table().map(<[_]>::len), Some(LEAF_ATTRS_SMALL)); + cache.set(rivals[1], 1, LeafAttrKind::InstanceOnly); + assert_eq!(cache.table().map(<[_]>::len), Some(LEAF_ATTRS_LARGE)); + assert!(matches!( + cache.get(first, 1), + Some(LeafAttrKind::Value(Object::Str(value))) if SharedStr::ptr_eq(value, &text) + )); + assert!(matches!( + cache.get(rivals[1], 1), + Some(LeafAttrKind::InstanceOnly) + )); + assert_eq!(SharedStr::strong_count(&text), 2); + drop(cache); + assert_eq!(SharedStr::strong_count(&text), 1); + } + #[test] fn cold_cache_and_its_clone_do_not_allocate_entries() { let cache = LeafAttrCache::new(); assert_eq!(std::mem::size_of_val(&cache), std::mem::size_of::()); assert!(cache.get(16, 1).is_none()); - // SAFETY: this test owns the cache exclusively. - assert!(unsafe { &*cache.0.get() }.is_none()); + assert!(cache.table().is_none()); cache.set(16, 1, LeafAttrKind::InstanceOnly); let other = cache.clone(); assert!(other.get(16, 1).is_none()); - // SAFETY: this test owns the clone exclusively. - assert!(unsafe { &*other.0.get() }.is_none()); + assert!(other.table().is_none()); } #[test] @@ -700,6 +938,10 @@ pub struct TypeObject { /// The leaf burst's per-class attribute-kind cache (see /// [`LeafAttrCache`]). pub leaf_attrs: LeafAttrCache, + /// [`Self::display_names`]'s memo: the version, dict stamp and C + /// `tp_name` it was computed under, the qualified name, and whether + /// the module is `__main__`. + display_name_memo: RefCell>, /// The most attributes an instance's `__dict__` was seen to hold /// (capped): new instances' dicts are presized to it, so `__init__`'s /// stores do not regrow them. @@ -731,6 +973,10 @@ pub struct TypeObject { /// slots out over (see [`TypeObject::fresh_slots`]), decided at the /// first instance: `None` for a class that doesn't qualify. pub slot_layout: std::sync::OnceLock>>, + /// [`Self::slot_layout`]'s word (see [`SharedSlice::word`]) once it is + /// decided and present, `0` otherwise: compiled code compares an + /// instance's laid-out slots' names against it in line. + pub slot_layout_word: std::sync::atomic::AtomicUsize, /// Cached "do instances of this type carry a `__del__` finalizer /// anywhere in their MRO?" answer, so [`crate::object::PyInstance`]'s /// `Drop` safety net can skip an MRO walk on the hot per-instance drop @@ -798,6 +1044,11 @@ pub struct TypeObject { /// Every exception construction asked the MRO for nine names. Last /// field: the hot ones above keep their offsets. pub exc_families: Cell, + /// The class's slot in the cycle collector's registry, or + /// [`crate::gc_trace::NO_SLOT`] while it isn't registered (as + /// [`PyInstance::gc_slot`]: every instance's traversal visits its + /// class, so finding the class's entry must not cost a hash probe). + pub gc_slot: crate::gc_trace::GcSlot, } /// A dying TypeObject clears the weak references watching it. @@ -858,6 +1109,19 @@ pub struct InstancePlan { /// its field count. A call with exactly that many positional arguments builds /// the tuple directly while the function still runs that code. pub tuple_new: Option<(usize, usize)>, + /// `C()` with no arguments is the allocation alone: the default + /// `__new__` and `object.__init__`, no native payload, not abstract, + /// and not a module or generic-alias subclass (whose allocators + /// differ). + pub bare_alloc: bool, + /// Whether construction is the stores of a store-only `__init__` (see + /// `Interpreter::core_store_init`): `0` not yet proven, `1` proven + /// for this class version, `2` never. + pub store_init: std::sync::atomic::AtomicU8, + /// A store-only `__init__`'s laid-out member positions, in store + /// order, once its stores proved them for this class version (see + /// `Interpreter::core_store_init`). + pub slot_members: std::sync::OnceLock>, } /// How a fresh instance's `native` payload is provisioned (see @@ -1135,6 +1399,7 @@ impl TypeObject { } let ty = Rc::new(TypeObject { name: name.to_owned(), + gc_slot: crate::gc_trace::GcSlot::new(), qualname: RefCell::new(qualname), bases: RefCell::new(bases.clone()), mro: RefCell::new(Vec::new()), @@ -1142,6 +1407,7 @@ impl TypeObject { flags, metaclass: RefCell::new(None), leaf_attrs: LeafAttrCache::new(), + display_name_memo: RefCell::new(None), inst_dict_hint: std::sync::atomic::AtomicU32::new(0), shared_keys: crate::sync::LazyArc::new(), native_kind: Cell::new(0), @@ -1150,6 +1416,7 @@ impl TypeObject { native_ext: std::sync::OnceLock::new(), abc_state: std::sync::OnceLock::new(), slot_layout: std::sync::OnceLock::new(), + slot_layout_word: std::sync::atomic::AtomicUsize::new(0), slot_names: RefCell::new(Vec::new()), declares_slots: Cell::new(false), forbids_dict: false, @@ -1239,12 +1506,45 @@ impl TypeObject { /// in place, with no per-instance names and no growth. #[inline] pub fn fresh_slots(&self) -> SlotStorage { - match self.slot_layout.get_or_init(|| self.member_slot_layout()) { + match self.slot_layout_init() { Some(layout) => SlotStorage::unset_over(layout.clone()), None => SlotStorage::default(), } } + /// Make `slots` this class's [`Self::fresh_slots`], leaving storage + /// that is already the empty default alone, and reusing a retired + /// instance's unset laid-out values (see [`SlotStorage::retire`]). + #[inline] + pub(crate) fn reset_slots(&self, slots: &mut SlotStorage) { + match self.slot_layout_init() { + Some(layout) => { + if !slots.reuse_unset_over(layout) { + *slots = SlotStorage::unset_over(layout.clone()); + } + } + None if slots.is_empty_default() => {} + None => *slots = SlotStorage::default(), + } + } + + /// [`Self::slot_layout`], decided now if it isn't yet. + #[inline] + fn slot_layout_init(&self) -> Option<&SharedSlice> { + self.slot_layout + .get_or_init(|| { + let layout = self.member_slot_layout(); + if let Some(layout) = &layout { + self.slot_layout_word.store( + SharedSlice::word(layout), + std::sync::atomic::Ordering::Relaxed, + ); + } + layout + }) + .as_ref() + } + /// Whether the class is one whose native method bodies read its slots /// by the position its `__init__` sets them in (`collections.deque`, /// `contextvars.Context`, asyncio's handles and futures): those keep @@ -1587,9 +1887,17 @@ impl TypeObject { /// LOAD_ATTR/STORE_ATTR sites guard on the version and deopt. pub fn bump_attr_version(&self) { use std::sync::atomic::Ordering::Relaxed; - let mut visited: Vec<*const TypeObject> = vec![std::ptr::from_ref::(self)]; self.attr_version.bump(); self.mro_kind.store(0, Relaxed); + // (A leaf class, the common case, has nothing to walk.) + if self + .subclasses + .try_borrow() + .is_ok_and(|subs| subs.iter().all(|w| w.strong_count() == 0)) + { + return; + } + let mut visited: Vec<*const TypeObject> = vec![std::ptr::from_ref::(self)]; let mut queue: Vec> = self.subclasses(); while let Some(t) = queue.pop() { let ptr = Rc::as_ptr(&t); @@ -1855,6 +2163,16 @@ impl TypeObject { info } + /// Whether `inst.__class__` on an instance of this type is + /// `object`'s descriptor answering the real class: neither + /// `__class__` nor `__getattribute__` is overridden anywhere in the + /// MRO. An `isinstance` miss then needs no `__class__` read. + #[inline] + pub fn class_attr_is_plain(&self) -> bool { + self.dunder(Dunder::Class).object_owner() + && self.dunder(Dunder::GetAttribute).object_owner() + } + pub fn lookup_with_owner(&self, name: &str) -> Option<(Object, Rc)> { // Fast pass — see `lookup` for the gate rationale. if !crate::object::exotic_str_keys_possible() { @@ -1876,6 +2194,76 @@ impl TypeObject { None } + /// A per-class yes/no verdict about `name`, memoized in the type + /// cache until the class or a base changes: `compute` runs only on + /// a miss, and must be a pure function of the class's attributes + /// (it runs no Python code). Each [`Verdict`] family's entries live + /// under the class's version with the family in its top byte, which + /// no real version has (the dunder memo already keeps versions below + /// 2**56), so they never answer an attribute lookup or another + /// family's question. + #[inline] + pub(crate) fn memo_verdict( + &self, + family: Verdict, + name: &str, + compute: impl FnOnce() -> bool, + ) -> bool { + let ty = std::ptr::from_ref::(self) as usize; + let ver = self.attr_version.get() | (family as u64) << 56; + // (The slot ignores the version's top byte: a family moves its + // entries off the ones the attribute lookups use.) + let h = type_cache::name_hash(name) ^ (family as u64).wrapping_mul(0x9E37_79B9_7F4A_7C15); + match type_cache::probe(ty, ver, name, h) { + Some(type_cache::Hit::Absent) => true, + Some(type_cache::Hit::At { .. }) => false, + None => { + let verdict = compute(); + let hit = if verdict { + type_cache::Hit::Absent + } else { + type_cache::Hit::At { + mro_idx: 0, + dict_idx: 0, + } + }; + type_cache::fill(ty, ver, name, h, hit); + verdict + } + } + } + + /// The verdict [`Self::verdict_record`] recorded for `name` under the + /// class's current version, if any. + #[inline] + pub(crate) fn verdict_cached(&self, family: Verdict, name: &str) -> Option { + let ty = std::ptr::from_ref::(self) as usize; + let ver = self.attr_version.get() | (family as u64) << 56; + let h = type_cache::name_hash(name) ^ (family as u64).wrapping_mul(0x9E37_79B9_7F4A_7C15); + match type_cache::probe(ty, ver, name, h)? { + type_cache::Hit::Absent => Some(true), + type_cache::Hit::At { .. } => Some(false), + } + } + + /// Record a verdict observed (rather than computed, as + /// [`Self::memo_verdict`] does) for `name` under the class's current + /// version; the cache may forget it. + pub(crate) fn verdict_record(&self, family: Verdict, name: &str, verdict: bool) { + let ty = std::ptr::from_ref::(self) as usize; + let ver = self.attr_version.get() | (family as u64) << 56; + let h = type_cache::name_hash(name) ^ (family as u64).wrapping_mul(0x9E37_79B9_7F4A_7C15); + let hit = if verdict { + type_cache::Hit::Absent + } else { + type_cache::Hit::At { + mro_idx: 0, + dict_idx: 0, + } + }; + type_cache::fill(ty, ver, name, h, hit); + } + /// The plain-`str`-keys MRO walk behind [`Self::lookup`] and /// [`Self::lookup_with_owner`], fronted by the per-thread /// [`type_cache`]. Returns the value and the MRO index of its owner. @@ -1887,6 +2275,20 @@ impl TypeObject { match type_cache::probe(ty, ver, name, h) { Some(type_cache::Hit::Absent) => return None, Some(type_cache::Hit::At { mro_idx, dict_idx }) => { + // (Guard-free views when they are free: nothing below runs + // code before the value is cloned.) + // SAFETY: both views end before anything else runs. + if let Some(owner) = + unsafe { self.mro.peek() }.and_then(|m| m.get(mro_idx as usize)) + { + if let Some(d) = unsafe { owner.dict.peek() } { + if let Some((k, v)) = d.get_index(dict_idx as usize) { + if matches!(&k.0, Object::Str(s) if type_cache::name_eq(s, name)) { + return Some((v.clone(), mro_idx as usize)); + } + } + } + } let mro = self.mro.borrow(); if let Some(owner) = mro.get(mro_idx as usize) { let d = owner.dict.borrow(); @@ -1901,7 +2303,8 @@ impl TypeObject { } None => {} } - let key = crate::object::StrKey(name); + // (Hashed at most once for the whole walk.) + let key = crate::object::StrKeyLazy::new(name); let mro = self.mro.borrow(); for (i, owner) in mro.iter().enumerate() { let d = owner.dict.borrow(); @@ -1951,13 +2354,60 @@ impl TypeObject { } } + /// CPython's `_PyType_GetFullyQualifiedName(type, '.')` (the `%T` + /// format): [`Self::qualified_display_name`], but without a + /// `__main__` prefix either. + pub fn fully_qualified_name(&self) -> String { + let (full, main) = self.display_names(); + match full.strip_prefix("__main__.") { + Some(rest) if main => rest.to_owned(), + _ => full, + } + } + + /// `module.qualname` as CPython's `type_repr` prints it (no module for + /// `builtins`). pub fn qualified_display_name(&self) -> String { + self.display_names().0 + } + + /// [`Self::qualified_display_name`], and whether the module is + /// `__main__`, memoized while the class's version, its dict's key + /// layout and its C `tp_name` stand (a `__qualname__` assignment + /// clears the memo). + fn display_names(&self) -> (String, bool) { + let ver = self.attr_version.get(); + let stamp = self.dict.try_borrow().map_or(0, |d| d.mutation_stamp()); + let tp_name = self.c_tp_name.get().map_or(0, |n| n.as_ptr() as usize); + if let Ok(memo) = self.display_name_memo.try_borrow() { + if let Some((v, s, t, name, main)) = &*memo { + if *v == ver && *s == stamp && *t == tp_name && stamp != 0 { + return (name.clone(), *main); + } + } + } + let names = self.compute_display_names(); + if let Ok(mut memo) = self.display_name_memo.try_borrow_mut() { + *memo = Some((ver, stamp, tp_name, names.0.clone(), names.1)); + } + names + } + + /// Forget [`Self::display_names`]'s memo (the class's qualified name + /// changed under an unchanged version). + pub(crate) fn forget_display_names(&self) { + if let Ok(mut memo) = self.display_name_memo.try_borrow_mut() { + *memo = None; + } + } + + fn compute_display_names(&self) -> (String, bool) { let dict = self.dict.borrow(); // Only honour *string* entries — some built-in types carry a // `__qualname__`/`__module__` *property descriptor* (for their // instances) in the dict, which must not leak into the class // repr (`type(gen)` printing `'>`). - let as_str = |name: &'static str| match dict.get(&DictKey(Object::from_static(name))) { + let as_str = |name: &'static str| match dict.get(&crate::object::StrKey(name)) { Some(Object::Str(s)) => Some(s.as_ref().to_owned()), _ => None, }; @@ -1974,10 +2424,18 @@ impl TypeObject { let qual = as_str("__qualname__") .or_else(|| self.qualname.borrow().clone()) .unwrap_or_else(|| self.name.clone()); - match module.as_deref() { + let main = module.as_deref() == Some("__main__"); + let full = match module.as_deref() { None | Some("builtins") | Some("") => qual, - Some(m) => format!("{m}.{qual}"), - } + Some(m) => { + let mut s = String::with_capacity(m.len() + 1 + qual.len()); + s.push_str(m); + s.push('.'); + s.push_str(&qual); + s + } + }; + (full, main) } /// The name CPython's `tp_name`-based error text prints: the full @@ -2178,38 +2636,88 @@ fn slot_name_eq(stored: &str, name: &str) -> bool { if a.len() != b.len() { return false; } - if a.len() > 16 { + let n = a.len(); + // (Two overlapping words cover every length from one word to two.) + let word = |s: &[u8], at: usize| u64::from_ne_bytes(s[at..at + 8].try_into().unwrap()); + let half = |s: &[u8], at: usize| u32::from_ne_bytes(s[at..at + 4].try_into().unwrap()); + match n { // Past a couple of words the library routine's vector loop wins. - return a == b; - } - let mut i = 0; - while i < a.len() { - if a[i] != b[i] { - return false; + 17.. => a == b, + 8..=16 => word(a, 0) == word(b, 0) && word(a, n - 8) == word(b, n - 8), + 4..=7 => half(a, 0) == half(b, 0) && half(a, n - 4) == half(b, n - 4), + _ => { + let mut i = 0; + while i < n { + if a[i] != b[i] { + return false; + } + i += 1; + } + true } - i += 1; } - true +} + +/// The slot names every raise populates (`args`, `__traceback__`, the +/// chaining links) and the commonest family fields, in [`common_slot_keys`] +/// order. `__traceback__` through `__suppress_context__` are [`ExcTail`]'s. +const COMMON_SLOT_NAMES: [&str; 10] = [ + "args", + "__traceback__", + "__context__", + "__cause__", + "__suppress_context__", + "message", + "value", + "msg", + "name", + "obj", +]; + +/// [`COMMON_SLOT_NAMES`], interned once. +fn common_slot_keys() -> &'static [Object; 10] { + static KEYS: std::sync::OnceLock<[Object; 10]> = std::sync::OnceLock::new(); + KEYS.get_or_init(|| COMMON_SLOT_NAMES.map(crate::stdlib::sys::intern_name)) +} + +/// A `BaseException` pseudo-slot, laid out at the end of every exception +/// instance's slots (see [`SlotStorage::exception`]). +#[derive(Clone, Copy)] +pub(crate) enum ExcTail { + Traceback = 0, + Context = 1, + Cause = 2, + SuppressContext = 3, +} + +impl ExcTail { + /// The slot's name. + pub(crate) fn name(self) -> &'static str { + COMMON_SLOT_NAMES[1 + self as usize] + } } /// The key for a newly populated slot `name`. The slots every raise /// populates (`args`, `__traceback__`, the chaining links) share one /// interned key each instead of allocating a string per exception. pub(crate) fn slot_key(name: &str) -> DictKey { - const COMMON: [&str; 8] = [ - "args", - "__traceback__", - "__context__", - "__cause__", - "__suppress_context__", - "message", - "value", - "msg", - ]; - static KEYS: std::sync::OnceLock<[Object; 8]> = std::sync::OnceLock::new(); - if let Some(i) = COMMON.iter().position(|c| *c == name) { - let keys = KEYS.get_or_init(|| COMMON.map(crate::stdlib::sys::intern_name)); - return DictKey(keys[i].clone()); + // (By length first: one comparison settles each common name.) + let common = match name.len() { + 3 if name == "msg" => Some(7), + 3 if name == "obj" => Some(9), + 4 if name == "args" => Some(0), + 4 if name == "name" => Some(8), + 5 if name == "value" => Some(6), + 7 if name == "message" => Some(5), + 9 if name == "__cause__" => Some(3), + 11 if name == "__context__" => Some(2), + 13 if name == "__traceback__" => Some(1), + 20 if name == "__suppress_context__" => Some(4), + _ => None, + }; + if let Some(i) = common { + debug_assert_eq!(COMMON_SLOT_NAMES[i], name); + return DictKey(common_slot_keys()[i].clone()); } // Interned, as instance-dict keys are: a guard holding the interned // name settles a slot's key by identity, and no instance allocates @@ -2217,7 +2725,79 @@ pub(crate) fn slot_key(name: &str) -> DictKey { DictKey(crate::stdlib::sys::intern_name(name)) } +/// How many [`ExcTail`] pseudo-slots end an exception layout. +#[cfg(target_pointer_width = "64")] +const EXC_TAIL_LEN: usize = 4; + +/// The shared slot layout of an exception instance whose families' own +/// fields are `extra`: `args`, `extra`, then the [`ExcTail`] pseudo-slots, +/// which raising and chaining populate. `None` for a shape without one +/// (its slots are stored per key). +#[cfg(target_pointer_width = "64")] +fn exception_layout(extra: &[&'static str]) -> Option> { + type Layout = std::sync::OnceLock>; + static PLAIN: Layout = Layout::new(); + static VALUE: Layout = Layout::new(); + static MSG: Layout = Layout::new(); + static NAME_OBJ: Layout = Layout::new(); + static NAME: Layout = Layout::new(); + let cell = match extra { + [] => &PLAIN, + ["value"] => &VALUE, + ["msg"] => &MSG, + ["name", "obj"] => &NAME_OBJ, + ["name"] => &NAME, + _ => return None, + }; + Some( + cell.get_or_init(|| { + std::iter::once("args") + .chain(extra.iter().copied()) + .chain(COMMON_SLOT_NAMES[1..=EXC_TAIL_LEN].iter().copied()) + .map(slot_key) + .collect::>() + .into() + }) + .clone(), + ) +} + impl SlotStorage { + /// The slots of a new exception instance: `args`, then its families' + /// own fields `extra` (`StopIteration.value`, `AttributeError`'s + /// `name` and `obj`), with the `BaseException` pseudo-slots laid out + /// unset after them, so a raise stores its traceback and chaining + /// links in place. + pub(crate) fn exception( + args: Object, + extra: [(&'static str, Object); N], + ) -> Self { + let names: [&'static str; N] = std::array::from_fn(|i| extra[i].0); + #[cfg(target_pointer_width = "64")] + if let Some(layout) = exception_layout(&names) { + // Written in place: `args`, the fields, then the unset tail. + let mut values = Box::<[Object]>::new_uninit_slice(layout.len()); + values[0].write(args); + for (slot, (_, v)) in values[1..].iter_mut().zip(extra) { + slot.write(v); + } + for slot in &mut values[1 + N..] { + slot.write(Object::Unbound); + } + // SAFETY: every element was written above (the layout holds + // `args`, the `N` fields and the tail). + let values = unsafe { values.assume_init() }; + return Self { + data: SlotData::Fixed { layout, values }, + }; + } + let _ = names; + let mut entries = Vec::with_capacity(N + 2); + entries.push((slot_key("args"), args)); + entries.extend(extra.into_iter().map(|(k, v)| (slot_key(k), v))); + Self::from_entries(entries) + } + /// Storage holding exactly `entries` (distinct `str` keys, in slot /// order), built in one step. pub fn from_entries(entries: Vec<(DictKey, Object)>) -> Self { @@ -2256,7 +2836,7 @@ impl SlotStorage { /// Access native fields only when the shared layout is the same /// allocation. Equal user-defined slot names aren't sufficient. - #[inline] + #[inline(always)] pub(crate) fn values_for_layout(&self, expected: &SharedSlice) -> Option<&[Object]> { match &self.data { SlotData::Fixed { layout, values } if SharedSlice::ptr_eq(layout, expected) => { @@ -2290,6 +2870,55 @@ impl SlotStorage { } } + /// Whether this is the empty [`Default`] storage, which a reset to the + /// default would only rebuild (through the enum's drop glue). + #[inline(always)] + pub(crate) fn is_empty_default(&self) -> bool { + matches!( + self.data, + SlotData::Single { + key: None, + value: Object::None + } + ) + } + + /// Empty the storage of a retiring instance whose values are all + /// atomic (releasing them runs no code): laid-out values are unset in + /// place, keeping their allocation for the next tenant (see + /// [`Self::reuse_unset_over`]); any other form becomes the default. + pub(crate) fn retire(&mut self) { + if let SlotData::Fixed { values, .. } = &mut self.data { + for v in values.iter_mut() { + *v = Object::Unbound; + } + } else if !self.is_empty_default() { + *self = Self::default(); + } + } + + /// Lay a retired storage (see [`Self::retire`]) out over `layout`, all + /// unset, reusing its values' allocation: `false` when it has none of + /// that size (the caller builds fresh storage). + #[inline] + pub(crate) fn reuse_unset_over(&mut self, layout: &SharedSlice) -> bool { + let SlotData::Fixed { + layout: own, + values, + } = &mut self.data + else { + return false; + }; + if values.len() != layout.len() { + return false; + } + if !SharedSlice::ptr_eq(own, layout) { + *own = layout.clone(); + } + debug_assert!(values.iter().all(|v| matches!(v, Object::Unbound))); + true + } + /// Storage holding a natively packed value (see [`SlotData::Packed`]). pub(crate) fn from_packed(packed: crate::stdlib::datetime_native::PackedSlots) -> Self { Self { @@ -2378,6 +3007,23 @@ impl SlotStorage { Self::default() } + /// Never skipped here (see the 64-bit variant). + #[inline(always)] + pub(crate) fn is_empty_default(&self) -> bool { + false + } + + /// Empty a retiring instance's storage (see the 64-bit variant). + pub(crate) fn retire(&mut self) { + *self = Self::default(); + } + + /// Never laid out here (see the 64-bit variant). + #[inline] + pub(crate) fn reuse_unset_over(&mut self, _layout: &SharedSlice) -> bool { + false + } + /// [`Self::index_of`] (never laid out here; see the 64-bit variant). pub fn store_position(&self, name: &str) -> Option { self.index_of(name) @@ -2464,6 +3110,16 @@ impl SlotStorage { } } + /// [`Self::get_index`] with the common layout of a few `__slots__` + /// members read in line (a cached member load's hot path). + #[inline(always)] + pub fn get_index_hot(&self, index: usize) -> Option<(&DictKey, &Object)> { + if let SlotData::Small(entries) = &self.data { + return entries.get(index).map(|(key, value)| (key, value)); + } + self.get_index(index) + } + /// Read an ordered entry. Callers caching an index must also validate /// its key; the class identity alone does not determine slot order. #[inline] @@ -2765,6 +3421,86 @@ impl SlotStorage { } } + /// The place of the exception pseudo-slot `which` (holding `Unbound` + /// while unset) in storage laid out over an exception layout (see + /// [`Self::exception`]): one identity compare of the laid-out key. + /// `None` for any other storage. + #[inline] + pub(crate) fn exc_tail_mut(&mut self, which: ExcTail) -> Option<&mut Object> { + let SlotData::Fixed { layout, values } = &mut self.data else { + return None; + }; + let i = layout.len().checked_sub(EXC_TAIL_LEN)? + which as usize; + match (&layout[i].0, &common_slot_keys()[1 + which as usize]) { + (Object::Str(laid), Object::Str(key)) + if crate::shared_value::SharedStr::ptr_eq(laid, key) => + { + values.get_mut(i) + } + _ => None, + } + } + + /// [`Self::place_mut`] of the exception pseudo-slot `which`, by + /// [`Self::exc_tail_mut`] when the storage has an exception layout. + #[inline] + pub(crate) fn exc_tail_place(&mut self, which: ExcTail) -> Option<&mut Object> { + if self.exc_tail_mut(which).is_some() { + return self.exc_tail_mut(which); + } + self.place_mut(which.name()) + } + + /// Where slot `name` lives: its laid-out place (holding `Unbound` + /// while unset), else its populated slot. `None` when a store must + /// add the slot. + pub fn place_mut(&mut self, name: &str) -> Option<&mut Object> { + self.unpack(); + let laid_out = match &self.data { + SlotData::Fixed { layout, .. } => Some(layout.iter().position( + |key| matches!(&key.0, Object::Str(stored) if slot_name_eq(stored.as_ref(), name)), + )?), + _ => None, + }; + match laid_out { + Some(i) => match &mut self.data { + SlotData::Fixed { values, .. } => values.get_mut(i), + _ => None, + }, + None => self.get_mut(name), + } + } + + /// The laid-out places (holding `Unbound` while unset) of the two + /// distinct slots `a` and `b`, when the storage's fixed layout holds + /// both (an `AttributeError`'s `name` and `obj`). `None` otherwise. + pub(crate) fn laid_out_pair_mut( + &mut self, + a: &str, + b: &str, + ) -> Option<(&mut Object, &mut Object)> { + let SlotData::Fixed { layout, values } = &mut self.data else { + return None; + }; + let pos = |name: &str| { + layout.iter().position( + |key| matches!(&key.0, Object::Str(stored) if slot_name_eq(stored.as_ref(), name)), + ) + }; + let (i, j) = (pos(a)?, pos(b)?); + if i == j || values.len() != layout.len() { + return None; + } + let (lo, hi) = (i.min(j), i.max(j)); + let (head, tail) = values.split_at_mut(hi); + let (first, second) = (&mut head[lo], &mut tail[0]); + Some(if i < j { + (first, second) + } else { + (second, first) + }) + } + pub fn insert(&mut self, name: &str, value: Object) -> Option { self.insert_with_key(name, value, || slot_key(name)) } @@ -2901,6 +3637,44 @@ impl SlotStorage { // (An unset laid-out slot.) .filter(|(_, value)| !matches!(value, Object::Unbound)) } + + /// Call `f` on each populated slot, as [`Self::iter`] yields them, by + /// a direct walk of the representation (the collector's traversal). + #[inline] + pub(crate) fn for_each_entry(&self, mut f: impl FnMut(&DictKey, &Object)) { + let mut each = |k: &DictKey, v: &Object| { + if !matches!(v, Object::Unbound) { + f(k, v); + } + }; + match &self.data { + SlotData::Single { key, value } => { + if let Some(key) = key { + each(key, value); + } + } + SlotData::Small(entries) => { + for (k, v) in entries { + each(k, v); + } + } + SlotData::Many(table) => { + for (k, v) in table.iter() { + each(k, v); + } + } + SlotData::Fixed { layout, values } => { + for (k, v) in layout.iter().zip(values.iter()) { + each(k, v); + } + } + SlotData::Packed(p) => { + for (k, v) in p.layout().iter().zip(p.values().iter()) { + each(k, v); + } + } + } + } } /// Slot storage for targets where an inline object pair would enlarge @@ -2922,6 +3696,11 @@ impl SlotStorage { self.0.get_index(index) } + #[inline] + pub fn get_index_hot(&self, index: usize) -> Option<(&DictKey, &Object)> { + self.0.get_index(index) + } + #[inline] pub fn get_index_mut(&mut self, index: usize) -> Option<(&DictKey, &mut Object)> { self.0.get_index_mut(index) @@ -2935,6 +3714,33 @@ impl SlotStorage { self.0.get(&crate::object::StrKey(name)) } + /// The populated slot `name` (nothing is laid out here; see the + /// 64-bit variant). + pub fn place_mut(&mut self, name: &str) -> Option<&mut Object> { + self.get_mut(name) + } + + /// Never laid out here (see the 64-bit variant). + pub(crate) fn laid_out_pair_mut( + &mut self, + _a: &str, + _b: &str, + ) -> Option<(&mut Object, &mut Object)> { + None + } + + /// Never laid out here (see the 64-bit variant). + #[inline] + pub(crate) fn exc_tail_mut(&mut self, _which: ExcTail) -> Option<&mut Object> { + None + } + + /// The populated pseudo-slot `which` (see the 64-bit variant). + #[inline] + pub(crate) fn exc_tail_place(&mut self, which: ExcTail) -> Option<&mut Object> { + self.get_mut(which.name()) + } + pub fn insert(&mut self, name: &str, value: Object) -> Option { self.insert_with_key(name, value, || slot_key(name)) } @@ -2967,6 +3773,14 @@ impl SlotStorage { pub fn iter(&self) -> impl Iterator { self.0.iter() } + + /// Call `f` on each populated slot. + #[inline] + pub(crate) fn for_each_entry(&self, mut f: impl FnMut(&DictKey, &Object)) { + for (k, v) in self.0.iter() { + f(k, v); + } + } } /// An instance of a user-defined class. @@ -3039,6 +3853,12 @@ pub struct PyInstance { /// mutation reached through the dict alone (`vars(obj)['x'] = y`) /// still starts tracking; the two are set and cleared together. pub deferred: Cell, + /// The instance's slot in the cycle collector's registry, or + /// [`crate::gc_trace::NO_SLOT`] while it isn't registered. The + /// registry keeps no id index for instances: this field is how a + /// collection finds an instance's entry, and how the instance's + /// `Drop` removes it. + pub gc_slot: crate::gc_trace::GcSlot, /// The stable C "inline body" this instance owns once it has crossed /// into a C extension that reads its fields at fixed `tp_basicsize` /// offsets (RFC 0045, wave 3). `0` for the overwhelmingly common case @@ -3070,6 +3890,7 @@ impl PyInstance { finalize_ran: Cell::new(false), deferred: Cell::new(false), c_body: CBody::default(), + gc_slot: crate::gc_trace::GcSlot::new(), } } @@ -3087,6 +3908,7 @@ impl PyInstance { finalize_ran: Cell::new(false), deferred: Cell::new(false), c_body: CBody::default(), + gc_slot: crate::gc_trace::GcSlot::new(), } } @@ -3107,7 +3929,7 @@ impl PyInstance { // class changes. A pooled instance keeps whatever dict it // was retired with, already cleared and carrying the record. if let Some(m) = Rc::get_mut(&mut inst) { - *m.slots.get_mut() = class.fresh_slots(); + class.reset_slots(m.slots.get_mut()); *m.class.get_mut() = class; m.deferred.set(true); if hint > 0 { @@ -3172,20 +3994,35 @@ impl PyInstance { /// pool for `new_deferred` (CPython's per-type freelist), or drop it. /// The caller established that `obj` is its only reference, the /// instance is still deferred and owns no C body. - pub fn try_recycle(mut inst: Rc) { + pub fn try_recycle(inst: Rc) { + if let Err(inst) = Self::recycle(inst) { + // (A plain drop: the caller found no finalizer owed.) + crate::rc::drop_arc(Rc::into_arc(inst)); + } + } + + /// [`Self::try_recycle`], handing back an instance it doesn't pool + /// (whose state may be partly reset: it is dying) for the caller to + /// free without its last-release hook, which may be what called this. + pub(crate) fn recycle(mut inst: Rc) -> Result<(), Rc> { // SAFETY: the caller holds the only reference. if unsafe { &*inst.class.as_ptr() }.native_kind.get() != 0 { - if let Err(inst) = crate::stdlib::datetime_native::recycle(inst) { - drop(Rc::into_arc(inst)); - } - return; + return crate::stdlib::datetime_native::recycle(inst); + } + // A full pool (the program discards more instances than it makes + // through the pool) takes nothing: skip the reset. + let room = INSTANCE_POOL + .try_with(|p| p.try_borrow().is_ok_and(|p| p.len() < INSTANCE_POOL_CAP)) + .unwrap_or(false); + if !room { + return Err(inst); } let Some(m) = Rc::get_mut(&mut inst) else { - return; + return Err(inst); }; let owner = std::ptr::from_ref(&*m) as usize; if m.native.get().is_some() || m.finalize_ran.get() || m.c_body.get() != 0 { - return; + return Err(inst); } // Split values are atomic (the instance is deferred): clearing // them runs no code. The allocation stays for the next tenant. @@ -3198,32 +4035,40 @@ impl PyInstance { // hand out the same `Arc`, and a holder must keep seeing the // dead instance's attributes, not the next tenant's. if m.dict.strong_count() != 1 { - return; + return Err(inst); } // Reset in place: values are atomic, so clearing runs no code // that could observe the instance. let Ok(mut d) = dict.try_borrow_mut() else { - return; + return Err(inst); }; if d.capacity() > 32 { - return; + drop(d); + return Err(inst); } d.map_mut_atomic_store().clear(); d.reset_deferred_owner(owner); } - *m.slots.get_mut() = SlotStorage::default(); + m.slots.get_mut().retire(); m.inline_values.set(true); m.deferred.set(true); m.hash_cache = crate::sync::CachedHash::new(None); // A pooled instance must not keep its class alive (a transient // class is collected as soon as its last instance dies). *m.class.get_mut() = crate::builtin_types::builtin_types().object_.clone(); - INSTANCE_POOL.with(|p| { - let mut p = p.borrow_mut(); - if p.len() < INSTANCE_POOL_CAP { - p.push(inst); + let mut inst = Some(inst); + // (A thread whose locals are being torn down pools nothing.) + let _ = INSTANCE_POOL.try_with(|p| { + if let Ok(mut p) = p.try_borrow_mut() { + if p.len() < INSTANCE_POOL_CAP { + p.extend(inst.take()); + } } }); + match inst { + None => Ok(()), + Some(inst) => Err(inst), + } } /// Whether tracking is still deferred (the `__dict__` carries the @@ -3345,6 +4190,42 @@ impl PyInstance { (!matches!(v, Object::Unbound)).then_some(v) } + /// [`Self::laid_out_slot`], set or not: what a store to the member + /// would replace. + /// + /// # Safety + /// + /// As [`crate::sync::GilCell::peek`]. + #[inline(always)] + pub(crate) unsafe fn laid_out_slot_any(&self, i: usize) -> Option<&Object> { + let layout = self.cls_raw().slot_layout.get()?.as_ref()?; + // SAFETY: forwarded contract. + unsafe { self.slots.peek() }? + .values_for_layout(layout)? + .get(i) + } + + /// [`Self::laid_out_slot`] for a store of a value of atomicity + /// `atomic`, set or not (a store fills an unset member): the write + /// barrier runs first (a non-atomic value starts tracking a deferred + /// instance), then the member's place. + /// + /// # Safety + /// + /// As [`crate::sync::GilCell::peek_mut`]. + #[inline(always)] + #[allow(clippy::mut_from_ref)] + pub(crate) unsafe fn laid_out_slot_mut(&self, i: usize, atomic: bool) -> Option<&mut Object> { + let layout = self.cls_raw().slot_layout.get()?.as_ref()?; + if !atomic && self.deferred.get() { + self.ensure_gc_tracked(); + } + // SAFETY: forwarded contract. + unsafe { self.slots.peek_mut() }? + .values_for_layout_mut(layout)? + .get_mut(i) + } + /// Where [`Self::laid_out_slot`] finds member slot `name` on this /// instance: its position in the class's slot layout, when the /// instance's slots are laid out over it (set or not), and the @@ -3379,6 +4260,19 @@ impl PyInstance { self.slots.borrow_mut().insert(name, value); } + /// [`Self::slot_set`] of an exception pseudo-slot: in its laid-out + /// place when the instance has one (see `SlotStorage::exc_tail_mut`). + /// Returns the displaced value (`Unbound` if unset), dropped by the + /// caller once the slots are released. + pub(crate) fn exc_tail_set(&self, which: ExcTail, value: Object) -> Object { + self.note_slot_store(&value); + let mut slots = self.slots.borrow_mut(); + if let Some(place) = slots.exc_tail_mut(which) { + return std::mem::replace(place, value); + } + slots.insert(which.name(), value).unwrap_or(Object::Unbound) + } + /// Delete slot `name` from the side table; `false` when unset. pub fn slot_del(&self, name: &str) -> bool { self.slots.borrow_mut().remove(name).is_some() @@ -3437,7 +4331,10 @@ impl Drop for PyInstance { crate::weakref_registry::on_death(id); // A collector registry entry's weak handle would keep this // allocation until its generation is next collected. - crate::gc_trace::forget_dead(id); + let slot = self.gc_slot.get(); + if slot != crate::gc_trace::NO_SLOT { + crate::gc_trace::forget_instance(slot, id as usize); + } } } diff --git a/crates/weavepy-vm/src/vm_singletons.rs b/crates/weavepy-vm/src/vm_singletons.rs index 47e66099..a23bb32c 100644 --- a/crates/weavepy-vm/src/vm_singletons.rs +++ b/crates/weavepy-vm/src/vm_singletons.rs @@ -150,14 +150,20 @@ pub(crate) fn finalize_on_last_release(arc: std::sync::Arc< } else if t == TypeId::of::() { // SAFETY: as above, for `PyGenerator`. let g = unsafe { Arc::from_raw(Arc::into_raw(arc).cast::()) }; + let owes_for = |state: &GeneratorState| match state { + GeneratorState::Suspended(_) => true, + GeneratorState::Created(_) => g.kind == CoroutineKind::Coroutine, + GeneratorState::Finished | GeneratorState::Running | GeneratorState::Delegating(_) => { + false + } + }; + // SAFETY: a read that runs no code (`peek_mut` rejects a live + // borrow or shared cells, which take the borrow). let owes = !g.finalize_ran.get() - && g.state.try_borrow().is_ok_and(|state| match &*state { - GeneratorState::Suspended(_) => true, - GeneratorState::Created(_) => g.kind == CoroutineKind::Coroutine, - GeneratorState::Finished - | GeneratorState::Running - | GeneratorState::Delegating(_) => false, - }); + && match unsafe { g.state().peek_mut() } { + Some(state) => owes_for(state), + None => g.state().try_borrow().is_ok_and(|state| owes_for(&state)), + }; // A plain generator suspended outside any handler of its own // (CPython's `gen_close` shortcut) just finishes, here: nothing // could observe the `GeneratorExit` its finalizer would throw. @@ -598,7 +604,7 @@ pub fn thread_ident_is_live(id: u64) -> bool { #[derive(Clone, Debug)] pub struct ThreadHandles { pub frame_stack: crate::object::FrameStack, - pub exc_info_stack: Rc>>, + pub exc_info_stack: Rc>>, pub excepthook: Rc>, pub unraisable_hook: Rc>, } @@ -668,6 +674,12 @@ pub fn current_thread_handles() -> Option { CURRENT_THREAD_HANDLES.with(|cell| cell.borrow().last().cloned()) } +/// The current thread's frame stack alone (see [`current_thread_handles`], +/// whose other handles `sys._getframe` and its kin never read). +pub fn current_frame_stack() -> Option { + CURRENT_THREAD_HANDLES.with(|cell| cell.borrow().last().map(|h| h.frame_stack.clone())) +} + /// RFC 0066 WS4 — swap the *entire* handles stack, returning the old /// one. Greenlet switches use this: handle guards live on whichever /// native stack pushed them, so once greenlets multiplex several diff --git a/crates/weavepy-vm/src/weak_object.rs b/crates/weavepy-vm/src/weak_object.rs index 65cefc96..56755ffa 100644 --- a/crates/weavepy-vm/src/weak_object.rs +++ b/crates/weavepy-vm/src/weak_object.rs @@ -54,6 +54,42 @@ macro_rules! weak_object { pub fn is_dead(&self) -> bool { self.strong_count() == 0 } + + /// Run `f` on the object, while it is alive, through a handle + /// that takes no reference (`None` once it died). + /// + /// # Safety + /// + /// Nothing `f` does may release the object's last reference. + #[inline] + pub unsafe fn with_borrowed(&self, f: impl FnOnce(&Object) -> R) -> Option { + if self.is_dead() { + return None; + } + // SAFETY: the payload is alive (its strong count isn't + // zero), stays so per the caller, and the view is never + // dropped, so it releases nothing. + let obj = std::mem::ManuallyDrop::new(unsafe { + match self { + Self::Tuple(w) => { + Object::Tuple(std::mem::ManuallyDrop::into_inner(w.borrowed_arc())) + } + $(Self::$variant(w) => Object::$variant(Rc::from_raw(w.as_ptr())),)* + } + }); + Some(f(&obj)) + } + + /// The payload's address, as [`Object::payload_addr`] reports + /// it for a strong owner (valid after the object died: the + /// handle keeps the allocation). + #[inline] + pub fn addr(&self) -> usize { + match self { + Self::Tuple(w) => w.addr(), + $(Self::$variant(w) => w.as_ptr().cast::<()>() as usize,)* + } + } } }; (@payload Long) => { Weak }; diff --git a/crates/weavepy/src/lib.rs b/crates/weavepy/src/lib.rs index d2835c35..9e627ca3 100644 --- a/crates/weavepy/src/lib.rs +++ b/crates/weavepy/src/lib.rs @@ -78,12 +78,13 @@ impl Error { Error::Runtime(vm::RuntimeError::PyException(exc)) => { let mut s = String::new(); let _ = writeln!(s, "Traceback (most recent call last):"); - // Tracebacks are accumulated from inner-most frame - // outward; print outer-most first to match CPython. - if exc.traceback.is_empty() { + // The `__traceback__` chain, outermost frame first, as + // CPython prints it. + let entries = exc.traceback_entries(); + if entries.is_empty() { let _ = writeln!(s, " File \"{filename}\", line ?, in "); } else { - for entry in exc.traceback.iter().rev() { + for entry in &entries { let _ = writeln!( s, " File \"{}\", line {}, in {}", diff --git a/tests/ecosystem/manifest.toml b/tests/ecosystem/manifest.toml index e5a526f8..3c9c2d7e 100644 --- a/tests/ecosystem/manifest.toml +++ b/tests/ecosystem/manifest.toml @@ -39,6 +39,9 @@ # deselect — array of `pytest --deselect` arguments; every # entry carries an inline comment naming the # measured failure class +# deselect_linux, deselect_macos, deselect_windows: +# the same, applied only when the harness runs on +# that OS (an escape one OS's runner needs) # timeout_seconds — optional budget for the selftest stage alone # (default 600 s) # @@ -349,6 +352,22 @@ requirements = "pytest==8.4.2" # FileNotFoundError only when it detects CI (`on_ci()`) — it skips # locally, fails on GitHub Actions, and never exercises WeavePy. command = "Tests --deselect Tests/test_tiff_crashes.py" +# TestAvifLeaks::test_leak_load deselected on macOS only. It bounds the +# growth of the process's *peak* RSS (`ru_maxrss`) over one AVIF decode +# at cpu_count * 3 MB (9 MB on the 3-core runner), so it fails whenever +# the process is at its high-water mark when the test starts. By then +# the suite has grown the process to about 3 GB on a 7 GB runner, and +# under that memory pressure WeavePy's RSS sat at its peak (the margin +# measured 0-54 MB across runs), so the decode's own buffers set a new +# peak (21.7 MB in the failing run). It isn't a leak: the same binary +# passed it in 5 of 5 standalone runs of the suite on the same runner +# image, the other leak tests' 100 iterations grew by 0 KB in the +# failing run, and it passes on Linux. (main passed only because its +# collector's scratch, hundreds of MB per full collection, set peaks +# far above the working set.) +deselect_macos = [ + "Tests/test_file_avif.py::TestAvifLeaks::test_leak_load", # macOS runner peak-RSS headroom +] timeout_seconds = 7200 [packages.lxml] diff --git a/tests/regrtest/test_adapter_for_iter.py b/tests/regrtest/test_adapter_for_iter.py new file mode 100644 index 00000000..e2677706 --- /dev/null +++ b/tests/regrtest/test_adapter_for_iter.py @@ -0,0 +1,196 @@ +"""`for` loops over builtin adapters (`map`, `filter`, `enumerate`, `zip`, +`itertools.groupby`, ...) stepped natively: results, exhaustion, errors +and tracebacks from the callback, `StopIteration` raised by a callback, +mutation of the source, and finalizer timing. Each loop runs enough times +to warm the interpreter's fast paths and the compiled loop.""" +import gc +import itertools +import sys +import traceback + +ROUNDS = 300 + + +def leaf(x): + return x + 1 + + +def nonleaf(x): + return abs(x) + len(str(x)) + + +class C: + def m(self, x): + return x * 2 + + +def check(name, make, want): + for _ in range(ROUNDS): + got = [] + for x in make(): + got.append(x) + assert got == want, (name, got[:10], want[:10]) + + +xs = list(range(40)) +ws = ["a", "bb", "", "ccc"] * 5 +check("map leaf", lambda: map(leaf, xs), [x + 1 for x in xs]) +check("map nonleaf", lambda: map(nonleaf, xs), [abs(x) + len(str(x)) for x in xs]) +check("map int", lambda: map(int, ws[:0] + ["1", "22", "-3"]), [1, 22, -3]) +check("map str", lambda: map(str, xs), [str(x) for x in xs]) +check("map len", lambda: map(len, ws), [len(w) for w in ws]) +check("map type", lambda: map(type, [1, "a", 2.0, None]), [int, str, float, type(None)]) +check("map bound", lambda: map(C().m, xs), [x * 2 for x in xs]) +check("map bound builtin", lambda: map({1: "x"}.get, [1, 2]), ["x", None]) +check("map two", lambda: map(lambda a, b: a * b, xs, xs[1:]), [a * b for a, b in zip(xs, xs[1:])]) +check("map same source", lambda: (lambda it: map(lambda a, b: (a, b), it, it))(iter(xs)), + [(xs[i], xs[i + 1]) for i in range(0, 40, 2)]) +check("filter None", lambda: filter(None, [0, 1, "", "a", None, 2.0]), [1, "a", 2.0]) +check("filter leaf", lambda: filter(lambda v: v % 3, xs), [x for x in xs if x % 3]) +check("filter nonleaf", lambda: filter(nonleaf, [0, -1, 2]), [0, -1, 2]) +check("filter len", lambda: filter(len, ws), [w for w in ws if w]) +check("enumerate map", lambda: enumerate(map(leaf, xs), 5), list(enumerate([x + 1 for x in xs], 5))) +check("enumerate gen", lambda: enumerate(x for x in xs), list(enumerate(xs))) +check("zip", lambda: zip(xs, ws), list(zip(xs, ws))) +check("reversed", lambda: reversed(xs), xs[::-1]) +check("chain", lambda: itertools.chain(xs, ws), xs + ws) +check("islice", lambda: itertools.islice(xs, 3, 30, 4), xs[3:30:4]) +keys = [1, 1, 2, 2, 2, 1, 3, 3] +check("groupby", lambda: ((k, list(g)) for k, g in itertools.groupby(keys)), + [(1, [1, 1]), (2, [2, 2, 2]), (1, [1]), (3, [3, 3])]) +check("groupby type", lambda: ((k, len(list(g))) for k, g in itertools.groupby([1, 2, "a", 3.0, 4.0], type)), + [(int, 2), (str, 1), (float, 2)]) +check("groupby leaf key", lambda: ((k, list(g)) for k, g in itertools.groupby(xs[:9], lambda v: v // 3)), + [(0, [0, 1, 2]), (1, [3, 4, 5]), (2, [6, 7, 8])]) +# A grouper outlived by its groupby's advance is empty. +for _ in range(ROUNDS): + groups = list(itertools.groupby(keys)) + assert [list(g) for _, g in groups] == [[], [], [], []], [list(g) for _, g in groups] + +# A grouper's own `for`, stopping when the key changes. +for _ in range(ROUNDS): + out = [] + for k, g in itertools.groupby("aaabbc"): + n = 0 + for _c in g: + n += 1 + out.append((k, n)) + assert out == [("a", 3), ("b", 2), ("c", 1)], out + + +# A raise in the callback propagates with its traceback. +def boom(x): + if x == 7: + raise ValueError("boom %d" % x) + return x + + +for _ in range(ROUNDS): + seen = [] + try: + for v in map(boom, xs): + seen.append(v) + except ValueError as e: + assert str(e) == "boom 7" + names = [f.name for f in traceback.extract_tb(e.__traceback__)] + assert names[-1] == "boom", names + else: + raise AssertionError("no raise") + assert seen == list(range(7)) + +# A pure leaf that raises (division by zero) raises from the loop. +for _ in range(ROUNDS): + try: + for v in map(lambda d: 10 // d, [5, 2, 0, 1]): + pass + except ZeroDivisionError: + pass + else: + raise AssertionError("no ZeroDivisionError") + + +# StopIteration from a callback ends the loop (CPython's FOR_ITER clears it). +def stopper(x): + if x == 5: + raise StopIteration + return x + + +for _ in range(ROUNDS): + got = [] + for v in map(stopper, xs): + got.append(v) + assert got == [0, 1, 2, 3, 4], got + got = [] + for v in filter(stopper, xs): + got.append(v) + assert got == [1, 2, 3, 4], got + # ... and the map stays exhausted only as far as its source is. + m = map(stopper, iter([5, 6])) + assert list(m) == [] + assert list(m) == [6] + +# An exhausted adapter stays exhausted; length hints. +for _ in range(ROUNDS): + m = map(leaf, xs) + for _v in m: + pass + assert list(m) == [] + it = iter(xs) + m = map(leaf, it) + next(m) + assert it.__length_hint__() == 39 + assert next(m) == 2 + +# Mutating the source list during the loop. +for _ in range(ROUNDS): + src = [1, 2, 3] + got = [] + for v in map(leaf, src): + got.append(v) + if len(src) < 6: + src.append(v * 10) + assert got == [2, 3, 4, 21, 31, 41], got + src = [1, 2, 3, 4] + got = [] + for v in filter(None, src): + got.append(v) + if src: + del src[-1] + assert got == [1, 2], got + +# Finalizers of items the callback drops run promptly. +log = [] + + +class Fin: + def __init__(self, i): + self.i = i + + def __del__(self): + log.append(self.i) + + +def take(f): + return f.i + + +for _ in range(50): + log.clear() + for i in map(take, [Fin(j) for j in range(5)]): + pass + gc.collect() + assert sorted(log) == list(range(5)), log + +# A set changing size during iteration still raises. +for _ in range(ROUNDS): + s = set(range(10)) + try: + for v in map(leaf, s): + s.add(v + 100) + except RuntimeError as e: + assert "changed size" in str(e) + else: + raise AssertionError("set size change not detected") + +print("adapter for-iter ok") diff --git a/tests/regrtest/test_asyncio_future_await_core.py b/tests/regrtest/test_asyncio_future_await_core.py new file mode 100644 index 00000000..925b3865 --- /dev/null +++ b/tests/regrtest/test_asyncio_future_await_core.py @@ -0,0 +1,104 @@ +"""`await fut` of a native asyncio future in the core loop: `GET_AWAITABLE` +makes the `FutureIter` in place, and `SEND` steps it without a +`StopIteration` for a future that finished with a result (see +`asyncio_mod::future_iter_send` in the VM). Exceptions, cancellation and +anything else the iterator owes still go through the general path. Each +case runs warm and checks the results asyncio documents. +""" + +import asyncio +import unittest + +WARM = 500 + + +class MyFuture(asyncio.Future): + pass + + +class OwnAwait(asyncio.Future): + def __await__(self): + return (yield "custom") + + +class FutureAwaitCoreTests(unittest.TestCase): + def run_main(self, coro): + return asyncio.run(coro) + + def test_results_warm(self): + async def main(): + loop = asyncio.get_running_loop() + total = 0 + for i in range(WARM): + fut = loop.create_future() + loop.call_soon(fut.set_result, i) + total += await fut + done = loop.create_future() + done.set_result(7) + return total, await done, await done + + self.assertEqual(self.run_main(main()), (sum(range(WARM)), 7, 7)) + + def test_subclass_warm(self): + async def main(): + loop = asyncio.get_running_loop() + out = [] + for i in range(WARM): + fut = MyFuture(loop=loop) + loop.call_soon(fut.set_result, (i, "x")) + out.append(await fut) + return out[-1], len(out) + + self.assertEqual(self.run_main(main()), ((WARM - 1, "x"), WARM)) + + def test_exception_and_cancel(self): + async def main(): + loop = asyncio.get_running_loop() + seen = [] + for i in range(WARM // 10): + fut = loop.create_future() + loop.call_soon(fut.set_exception, KeyError(i)) + try: + await fut + except KeyError as e: + seen.append(e.args[0]) + fut = loop.create_future() + loop.call_soon(fut.cancel) + try: + await fut + except asyncio.CancelledError: + seen.append("cancelled") + return seen + + seen = self.run_main(main()) + self.assertEqual(seen[:4], [0, "cancelled", 1, "cancelled"]) + self.assertEqual(len(seen), 2 * (WARM // 10)) + + def test_own_await(self): + def drive(coro): + return coro.send(None) + + async def custom(): + return await OwnAwait(loop=asyncio.new_event_loop()) + + self.assertEqual(drive(custom()), "custom") + + def test_gather_and_tasks(self): + async def leaf(i): + await asyncio.sleep(0) + return i + + async def main(): + total = 0 + for _ in range(WARM // 10): + res = await asyncio.gather(*[leaf(i) for i in range(5)]) + total += sum(res) + t = asyncio.ensure_future(leaf(10)) + total += await t + return total + + self.assertEqual(self.run_main(main()), (10 + 10) * (WARM // 10)) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_asyncio_loop_attr_memo.py b/tests/regrtest/test_asyncio_loop_attr_memo.py new file mode 100644 index 00000000..02d7a53a --- /dev/null +++ b/tests/regrtest/test_asyncio_loop_attr_memo.py @@ -0,0 +1,126 @@ +"""asyncio's native loop fast paths read the loop's own attributes. + +`call_soon`, `create_task` and `create_future` check a stock loop's +`_debug`, `_closed`, `_ready` and `_task_factory` natively, remembering +where an instance last held each name. Loops whose attributes sit at +other positions, debug mode switched on mid-run, and an instance-level +`get_debug` must all still be seen. A coroutine's bare `yield` +(`asyncio.sleep(0)`) reschedules its task for the next iteration. +""" + +import asyncio +import types + + +class OddLoop(asyncio.SelectorEventLoop): + """A loop whose instances set extra attributes first, so the names + the fast paths read sit at other positions than a stock loop's.""" + + def __init__(self): + self.a1 = 1 + self.a2 = 2 + self.a3 = 3 + super().__init__() + + +async def ticker(n, log, tag): + for i in range(n): + log.append((tag, i)) + await asyncio.sleep(0) + return tag + + +async def main(log): + a = asyncio.ensure_future(ticker(3, log, "a")) + b = asyncio.ensure_future(ticker(3, log, "b")) + assert await asyncio.gather(a, b) == ["a", "b"] + + +def run_on(loop): + log = [] + try: + loop.run_until_complete(main(log)) + finally: + loop.close() + # Bare yields interleave the two tasks one step at a time. + assert log == [("a", 0), ("b", 0), ("a", 1), ("b", 1), ("a", 2), ("b", 2)], log + + +# Stock loops and the odd layout, alternately, so each sees the other's +# remembered positions. +for _ in range(3): + run_on(asyncio.new_event_loop()) + run_on(OddLoop()) + + +# Debug mode switched on while running: handles made afterwards carry a +# source traceback (the Python `call_soon` path). +async def flip(): + loop = asyncio.get_running_loop() + h1 = loop.call_soon(lambda: None) + assert h1._source_traceback is None + loop.set_debug(True) + h2 = loop.call_soon(lambda: None) + assert h2._source_traceback, h2._source_traceback + loop.set_debug(False) + h3 = loop.call_soon(lambda: None) + assert h3._source_traceback is None + await asyncio.sleep(0) + + +for make in (asyncio.new_event_loop, OddLoop): + loop = make() + try: + loop.run_until_complete(flip()) + finally: + loop.close() + + +# An instance-level `get_debug` overrides the stock one. +loop = OddLoop() +loop.get_debug = types.MethodType(lambda self: True, loop) +try: + async def check(): + h = asyncio.get_running_loop().call_soon(lambda: None) + assert h._source_traceback, "instance get_debug was ignored" + + loop.run_until_complete(check()) +finally: + del loop.get_debug + loop.close() + + +# A task factory set on one loop doesn't leak into another. +made = [] + + +def factory(loop, coro, **kw): + made.append(coro) + return asyncio.Task(coro, loop=loop, **kw) + + +l1, l2 = asyncio.new_event_loop(), OddLoop() +l1.set_task_factory(factory) +try: + async def noop(): + return 7 + + assert l1.run_until_complete(l1.create_task(noop())) == 7 + assert l2.run_until_complete(l2.create_task(noop())) == 7 + assert len(made) == 1, made +finally: + l1.close() + l2.close() + + +# A closed loop refuses callbacks. +loop = OddLoop() +loop.close() +try: + loop.call_soon(print) +except RuntimeError as e: + assert "closed" in str(e), e +else: + raise AssertionError("call_soon on a closed loop") + +print("ok") diff --git a/tests/regrtest/test_attr_probes_and_lock_methods.py b/tests/regrtest/test_attr_probes_and_lock_methods.py new file mode 100644 index 00000000..fc254c85 --- /dev/null +++ b/tests/regrtest/test_attr_probes_and_lock_methods.py @@ -0,0 +1,187 @@ +"""`hasattr`/`getattr` probes, builtin method calls and lock methods. + +`hasattr` answers a method on a built-in kind or a class without +binding it, and must still propagate anything but `AttributeError`. +Builtin method calls release their receiver promptly, and a lock's +context-manager methods find their per-instance implementation by a +remembered position, which must survive other entries changing. +""" + +import io +import threading +import unittest + + +class Finalized: + count = 0 + + def __del__(self): + Finalized.count += 1 + + +class Props: + def method(self): + return 1 + + @property + def missing(self): + raise AttributeError("missing") + + @property + def broken(self): + raise ValueError("broken") + + +class Dynamic: + def __getattr__(self, name): + if name == "boom": + raise KeyError(name) + if name.startswith("dyn_"): + return name + raise AttributeError(name) + + +class Failing(Exception): + def __init__(self, *args): + super().__init__(*args) + + +class AttrProbeTest(unittest.TestCase): + def test_stream_methods(self): + for s in (io.StringIO(), io.BytesIO()): + for _ in range(500): + self.assertTrue(hasattr(s, "write")) + self.assertTrue(hasattr(s, "getvalue")) + self.assertFalse(hasattr(s, "no_such_method")) + s.close() + self.assertTrue(hasattr(s, "write")) + self.assertTrue(getattr(s, "closed")) + + def test_builtin_kinds(self): + for _ in range(500): + self.assertTrue(hasattr("x", "upper")) + self.assertTrue(hasattr([], "append")) + self.assertTrue(hasattr({}, "get")) + self.assertFalse(hasattr("x", "append")) + self.assertTrue(hasattr(1, "real")) + self.assertTrue(hasattr(1.5, "is_integer")) + self.assertFalse(hasattr((), "_private")) + self.assertEqual(getattr("abc", "upper")(), "ABC") + self.assertIsNone(getattr("abc", "nope", None)) + + def test_instances(self): + p = Props() + for _ in range(500): + self.assertTrue(hasattr(p, "method")) + self.assertFalse(hasattr(p, "missing")) + self.assertFalse(hasattr(p, "nothing")) + self.assertEqual(getattr(p, "method")(), 1) + self.assertEqual(getattr(p, "nothing", 7), 7) + with self.assertRaises(ValueError): + hasattr(p, "broken") + p.method = 5 + self.assertTrue(hasattr(p, "method")) + self.assertEqual(getattr(p, "method"), 5) + del p.method + self.assertEqual(getattr(p, "method")(), 1) + + def test_getattr_hook(self): + d = Dynamic() + for _ in range(300): + self.assertTrue(hasattr(d, "dyn_x")) + self.assertFalse(hasattr(d, "other")) + with self.assertRaises(KeyError): + hasattr(d, "boom") + with self.assertRaises(TypeError): + hasattr(d, 1) + + def test_modules_and_functions(self): + import os + + def f(): + pass + + f.tag = "t" + for _ in range(300): + self.assertTrue(hasattr(os, "getpid")) + self.assertFalse(hasattr(os, "no_such_name_here")) + self.assertTrue(hasattr(f, "tag")) + self.assertEqual(getattr(f, "tag", None), "t") + self.assertIsNone(getattr(f, "untagged", None)) + + +class BuiltinLaneTest(unittest.TestCase): + def test_receiver_released_promptly(self): + Finalized.count = 0 + for i in range(300): + Finalized().__reduce_ex__(4) + self.assertEqual(Finalized.count, i + 1) + + def test_exception_init_through_super(self): + for i in range(300): + e = Failing(i, "x") + self.assertEqual(e.args, (i, "x")) + + def test_bound_builtin_methods(self): + items = [] + append = items.append + for i in range(300): + append(i) + self.assertEqual("-".join(["a", str(i)]), "a-%d" % i) + self.assertEqual(len(items), 300) + + +class LockMethodTest(unittest.TestCase): + def check_lock(self, lock): + for _ in range(500): + with lock: + self.assertTrue(lock.locked() if hasattr(lock, "locked") else True) + self.assertFalse(lock.locked()) + try: + with lock: + raise RuntimeError("inside") + except RuntimeError: + pass + self.assertFalse(lock.locked()) + self.assertTrue(lock.acquire(False)) + lock.release() + + def test_lock(self): + self.check_lock(threading.Lock()) + + def test_rlock(self): + r = threading.RLock() + self.check_lock(r) + with r: + with r: + self.assertTrue(r._is_owned()) + self.assertFalse(r._is_owned()) + + def test_many_locks(self): + locks = [threading.Lock() for _ in range(50)] + [threading.RLock() for _ in range(50)] + for _ in range(20): + for lock in locks: + with lock: + pass + self.assertFalse(lock.locked()) + + def test_condition_and_threads(self): + cond = threading.Condition() + box = [] + + def worker(): + with cond: + box.append(1) + cond.notify() + + with cond: + t = threading.Thread(target=worker) + t.start() + while not box: + cond.wait(5) + t.join() + self.assertEqual(box, [1]) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_attribute_miss_site.py b/tests/regrtest/test_attribute_miss_site.py new file mode 100644 index 00000000..e762a512 --- /dev/null +++ b/tests/regrtest/test_attribute_miss_site.py @@ -0,0 +1,100 @@ +"""A `LOAD_ATTR` site that keeps failing raises its `AttributeError` early. + +A site whose generic load failed cools down; while it does, a plain +instance with no such attribute anywhere gets the `AttributeError` the +default lookup ends with, without the resolution passes. Anything that +makes the attribute exist, or changes how it is looked up, must be seen +at once. +""" + +import unittest + + +class Plain: + pass + + +def read(o): + return o.missing + + +def probe(o, n): + hits = 0 + for _ in range(n): + try: + read(o) + except AttributeError as e: + assert e.name == "missing" and e.obj is o + else: + hits += 1 + return hits + + +class AttributeMissSiteTest(unittest.TestCase): + def test_error_fields(self): + o = Plain() + for _ in range(300): + with self.assertRaises(AttributeError) as cm: + read(o) + self.assertEqual(cm.exception.name, "missing") + self.assertIs(cm.exception.obj, o) + self.assertEqual(str(cm.exception), "'Plain' object has no attribute 'missing'") + + def test_instance_attribute_appears(self): + o = Plain() + self.assertEqual(probe(o, 300), 0) + o.missing = 5 + self.assertEqual(probe(o, 10), 10) + del o.missing + self.assertEqual(probe(o, 10), 0) + + def test_class_attribute_appears(self): + class C: + pass + + o = C() + self.assertEqual(probe(o, 300), 0) + C.missing = 7 + self.assertEqual(probe(o, 10), 10) + del C.missing + self.assertEqual(probe(o, 10), 0) + + def test_getattr_hook_appears(self): + class C: + pass + + o = C() + self.assertEqual(probe(o, 300), 0) + C.__getattr__ = lambda self, name: 1 + self.assertEqual(probe(o, 10), 10) + del C.__getattr__ + self.assertEqual(probe(o, 10), 0) + + def test_property_raising(self): + calls = [] + + class C: + @property + def missing(self): + calls.append(1) + raise AttributeError("from property") + + o = C() + self.assertEqual(probe(Plain(), 300), 0) + for _ in range(10): + with self.assertRaises(AttributeError) as cm: + read(o) + self.assertEqual(str(cm.exception), "from property") + self.assertEqual(len(calls), 10) + + def test_receivers_change(self): + class Has: + missing = "here" + + self.assertEqual(probe(Plain(), 300), 0) + self.assertEqual(probe(Has(), 10), 10) + self.assertEqual(probe(Plain(), 10), 0) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_attribute_slow_arms.py b/tests/regrtest/test_attribute_slow_arms.py new file mode 100644 index 00000000..a9c4bb76 --- /dev/null +++ b/tests/regrtest/test_attribute_slow_arms.py @@ -0,0 +1,687 @@ +"""The slower arms of attribute resolution keep their exact semantics. + +Module attributes, `inst.__dict__`, a `__getattr__` hook reached without +the default lookup's `AttributeError`, both forms of `super().name`, and a +native `__init__` reached through `super()` are each served by a cached or +direct path once warm. Changes to the module, the class, or the receiver's +shape must be seen at once. +""" + +import types +import unittest + + +N = 300 + + +class Plain: + def __init__(self): + self.a = 1 + + +class Hooked: + def __init__(self): + self.a = 1 + + def __getattr__(self, name): + if name.startswith("x"): + return name.upper() + raise AttributeError(f"hooked {name}") + + +def read_module_attr(m, n): + out = [] + for _ in range(n): + out.append(m.value) + return out + + +def read_dict(o, n): + out = None + for _ in range(n): + out = o.__dict__ + return out + + +def read_hooked(o, n): + out = [] + for _ in range(n): + out.append(o.xy) + return out + + +class ModuleAttrTest(unittest.TestCase): + def test_rebinding_and_deletion(self): + m = types.ModuleType("m") + m.value = 1 + m.other = 2 + self.assertEqual(read_module_attr(m, N), [1] * N) + m.value = 3 + self.assertEqual(read_module_attr(m, 5), [3] * 5) + # Keys move: the site must not read a stale position. + del m.other + m.extra = 4 + self.assertEqual(read_module_attr(m, 5), [3] * 5) + del m.value + with self.assertRaises(AttributeError): + read_module_attr(m, 1) + m.value = 7 + self.assertEqual(read_module_attr(m, 5), [7] * 5) + + def test_another_module_at_the_same_site(self): + a = types.ModuleType("a") + b = types.ModuleType("b") + a.value, b.pad, b.value = "a", 0, "b" + self.assertEqual(read_module_attr(a, N), ["a"] * N) + self.assertEqual(read_module_attr(b, 3), ["b"] * 3) + self.assertEqual(read_module_attr(a, 3), ["a"] * 3) + + def test_module_getattr(self): + m = types.ModuleType("m") + m.__getattr__ = lambda name: "dyn:" + name + self.assertEqual(read_module_attr(m, N), ["dyn:value"] * N) + m.value = 1 + self.assertEqual(read_module_attr(m, 3), [1] * 3) + + +class InstanceDictTest(unittest.TestCase): + def test_identity_and_updates(self): + o = Plain() + d = read_dict(o, N) + self.assertIs(d, o.__dict__) + self.assertEqual(d, {"a": 1}) + o.b = 2 + self.assertEqual(read_dict(o, 3), {"a": 1, "b": 2}) + + def test_class_level_override_is_seen(self): + o = Plain() + read_dict(o, N) + Plain.__dict__ # (the class's own mapping proxy is untouched) + try: + Plain.__dict__ = property(lambda self: "custom") + except (AttributeError, TypeError): + pass + + class Sub(Plain): + @property + def __dict__(self): + return "custom" + + self.assertEqual(read_dict(Sub(), 3), "custom") + self.assertEqual(read_dict(o, 3), {"a": 1}) + + def test_slots_class_has_no_dict(self): + class S: + __slots__ = ("a",) + + read_dict(Plain(), N) + with self.assertRaises(AttributeError): + read_dict(S(), 1) + + def test_getattribute_override(self): + class G(Plain): + def __getattribute__(self, name): + if name == "__dict__": + return "intercepted" + return object.__getattribute__(self, name) + + read_dict(Plain(), N) + self.assertEqual(read_dict(G(), 3), "intercepted") + + +class GetattrHookTest(unittest.TestCase): + def test_hook_values_and_errors(self): + o = Hooked() + self.assertEqual(read_hooked(o, N), ["XY"] * N) + with self.assertRaises(AttributeError) as cm: + o.missing + self.assertEqual(str(cm.exception), "hooked missing") + self.assertEqual(cm.exception.name, "missing") + self.assertIs(cm.exception.obj, o) + self.assertFalse(hasattr(o, "missing")) + self.assertEqual(getattr(o, "missing", 9), 9) + + def test_real_attributes_win(self): + o = Hooked() + read_hooked(o, N) + o.xy = "own" + self.assertEqual(read_hooked(o, 3), ["own"] * 3) + del o.xy + Hooked.xy = "class" + try: + self.assertEqual(read_hooked(o, 3), ["class"] * 3) + finally: + del Hooked.xy + self.assertEqual(read_hooked(o, 3), ["XY"] * 3) + + def test_data_descriptor_raising(self): + class D: + @property + def xy(self): + raise AttributeError("from property") + + def __getattr__(self, name): + return "hook:" + name + + self.assertEqual(read_hooked(D(), N), ["hook:xy"] * N) + + def test_hook_added_and_removed(self): + class C: + pass + + o = C() + with self.assertRaises(AttributeError): + read_hooked(o, 1) + C.__getattr__ = lambda self, name: 1 + self.assertEqual(read_hooked(o, N), [1] * N) + del C.__getattr__ + with self.assertRaises(AttributeError) as cm: + read_hooked(o, 1) + self.assertEqual(str(cm.exception), "'C' object has no attribute 'xy'") + + +class Slotted: + __slots__ = ("_s", "_t") + + def __init__(self): + self._t = 1 + + def get(self): + try: + return self._s + except AttributeError as e: + return e + + +class SlotMissTest(unittest.TestCase): + def test_unset_slot_errors(self): + o = Slotted() + for _ in range(N): + e = o.get() + self.assertIsInstance(e, AttributeError) + self.assertEqual(e.name, "_s") + self.assertIs(e.obj, o) + # `%T`: the module, unless it is `builtins` or `__main__`. + mod = Slotted.__module__ + prefix = "" if mod in ("builtins", "__main__") else mod + "." + self.assertEqual(str(e), f"'{prefix}Slotted' object has no attribute '_s'") + + def test_site_serves_set_and_unset(self): + objs = [Slotted() for _ in range(4)] + for i, o in enumerate(objs): + if i % 2: + o._s = i + for _ in range(N): + got = [o.get() for o in objs] + self.assertIsInstance(got[0], AttributeError) + self.assertEqual(got[1], 1) + self.assertIsInstance(got[2], AttributeError) + self.assertEqual(got[3], 3) + objs[0]._s = "now" + del objs[1]._s + self.assertEqual(objs[0].get(), "now") + self.assertIsInstance(objs[1].get(), AttributeError) + + def test_renamed_class(self): + class R: + __slots__ = ("_s",) + + o = R() + for _ in range(N): + with self.assertRaises(AttributeError): + o._s + R.__qualname__ = "Renamed" + with self.assertRaises(AttributeError) as cm: + o._s + self.assertIn("Renamed' object has no attribute '_s'", str(cm.exception)) + R.__module__ = "elsewhere" + with self.assertRaises(AttributeError) as cm: + o._s + self.assertEqual(str(cm.exception), "'elsewhere.Renamed' object has no attribute '_s'") + + def test_getattr_added_later(self): + class H: + __slots__ = ("_s",) + + o = H() + for _ in range(N): + with self.assertRaises(AttributeError): + o._s + H.__getattr__ = lambda self, name: "hook" + self.assertEqual(o._s, "hook") + + +class ClassStoreTest(unittest.TestCase): + def test_store_is_seen(self): + class K: + n = 0 + + class Sub(K): + pass + + k, s = K(), Sub() + for i in range(N): + K.n = i + self.assertEqual(k.n, i) + self.assertEqual(s.n, i) + self.assertEqual(Sub.n, i) + K.fresh = "new" + self.assertEqual(k.fresh, "new") + + def test_metaclass_hooks_run(self): + seen = [] + + class Meta(type): + def __setattr__(cls, name, value): + seen.append(name) + super().__setattr__(name, value) + + class M(metaclass=Meta): + n = 0 + + def store(c, v): + c.n = v + + class P: + n = 0 + + for i in range(N): + store(P, i) + store(M, 5) + self.assertEqual(seen, ["n"]) + self.assertEqual(M.n, 5) + + def test_immutable_type(self): + def store(c): + c.attr = 1 + + class P: + pass + + for _ in range(N): + store(P) + with self.assertRaises(TypeError): + store(int) + + def test_replaced_value_finalized(self): + log = [] + + class Fin: + def __del__(self): + log.append("del") + + class P: + v = None + + def store(v): + P.v = v + + for _ in range(N): + store(1) + store(Fin()) + store(2) + self.assertEqual(log, ["del"]) + + +class PropertySiteTest(unittest.TestCase): + def test_polymorphic_site(self): + class A: + @property + def v(self): + return "prop" + + class B: + def __init__(self): + self.v = "field" + + def read(o): + return o.v + + for _ in range(N): + self.assertEqual(read(A()), "prop") + self.assertEqual(read(B()), "field") + self.assertEqual(read(A()), "prop") + + def test_getter_raises(self): + class A: + def __init__(self): + self.fail = False + + @property + def v(self): + if self.fail: + raise ValueError("boom") + return 1 + + a = A() + + def read(o): + return o.v + + for _ in range(N): + self.assertEqual(read(a), 1) + a.fail = True + with self.assertRaises(ValueError): + read(a) + + def test_property_replaced(self): + class A: + @property + def v(self): + return 1 + + def read(o): + return o.v + + a = A() + for _ in range(N): + self.assertEqual(read(a), 1) + A.v = property(lambda self: 2) + self.assertEqual(read(a), 2) + A.v = 3 + self.assertEqual(read(a), 3) + + +class ReflectedCompareTest(unittest.TestCase): + def test_subclass_reflected_first(self): + log = [] + + class A: + def __lt__(self, other): + log.append("A.lt") + return "A" + + def __eq__(self, other): + log.append("A.eq") + return False + + class B(A): + def __gt__(self, other): + log.append("B.gt") + return "B" + + def __eq__(self, other): + log.append("B.eq") + return NotImplemented + + a, b = A(), B() + for _ in range(N): + log.clear() + self.assertEqual(a < b, "B") + self.assertEqual(log, ["B.gt"]) + log.clear() + self.assertFalse(a == b) + self.assertEqual(log, ["B.eq", "A.eq"]) + B.__gt__ = lambda self, other: NotImplemented + log.clear() + self.assertEqual(a < b, "A") + self.assertEqual(log, ["A.lt"]) + + def test_unorderable(self): + class A: + pass + + class B(A): + def __gt__(self, other): + return NotImplemented + + for _ in range(N): + with self.assertRaises(TypeError): + A() < B() + + +class FunctionAttrTest(unittest.TestCase): + def test_counter_on_wrapper(self): + def counted(fn): + def wrapper(*args): + wrapper.calls += 1 + return fn(*args) + + wrapper.calls = 0 + return wrapper + + @counted + def double(x): + return 2 * x + + for i in range(N): + self.assertEqual(double(i), 2 * i) + self.assertEqual(double.calls, N) + double.__dict__ = {"calls": 100} + double(1) + self.assertEqual(double.calls, 101) + del double.calls + with self.assertRaises(AttributeError): + double(1) + + def test_function_dunders(self): + def f(): + pass + + def read(fn): + return fn.__name__, fn.__qualname__ + + for _ in range(N): + self.assertEqual(read(f)[0], "f") + f.__name__ = "g" + self.assertEqual(read(f)[0], "g") + + +class DunderClassTest(unittest.TestCase): + def test_class_reads(self): + import abc + import weakref + + class A(abc.ABC): + pass + + class B(A): + pass + + class C: + pass + + class D(A): + pass + + class Lying: + @property + def __class__(self): + return int + + b = B() + for _ in range(N): + self.assertIsInstance(b, A) + self.assertNotIsInstance(C(), A) + self.assertIs(b.__class__, B) + b.__class__ = D + self.assertIs(b.__class__, D) + self.assertNotIsInstance(b, B) + self.assertIs(Lying().__class__, int) + self.assertIsInstance(Lying(), int) + c = C() + self.assertIs(weakref.proxy(c).__class__, C) + + +class BuiltinTypeHasattrTest(unittest.TestCase): + def test_repeated_misses(self): + for _ in range(N): + self.assertFalse(hasattr(int, "_asyncio_future_blocking")) + self.assertTrue(hasattr(int, "from_bytes")) + self.assertEqual(getattr(int, "nope", 7), 7) + + def test_struct_sequence_attribute_set(self): + import os + + cls = type(os.stat(".")) + for _ in range(N): + self.assertFalse(hasattr(cls, "weavepy_probe")) + try: + cls.weavepy_probe = 1 + except TypeError: + return + self.assertTrue(hasattr(cls, "weavepy_probe")) + try: + del cls.weavepy_probe + except TypeError: + return + self.assertFalse(hasattr(cls, "weavepy_probe")) + + +class ChainMapTest(unittest.TestCase): + def test_maps_changes(self): + from collections import ChainMap + + c = ChainMap({"a": 1}, {"b": 2}) + for _ in range(N): + self.assertEqual(c["a"] + c["b"], 3) + c.maps = [{"a": 10}] + self.assertEqual(c["a"], 10) + with self.assertRaises(KeyError): + c["b"] + c.maps.append({"b": 20}) + self.assertEqual(c["b"], 20) + + def test_subclass_with_class_level_maps(self): + from collections import ChainMap + + class Odd(ChainMap): + pass + + o = Odd({"a": 1}) + for _ in range(N): + self.assertEqual(o["a"], 1) + o.__dict__["maps"] = [{"a": 5}] + self.assertEqual(o["a"], 5) + Odd.maps = property(lambda self: [{"a": 7}], lambda self, v: None) + try: + self.assertEqual(o["a"], 7) + finally: + del Odd.maps + self.assertEqual(o["a"], 5) + + +class StoredCallableTest(unittest.TestCase): + def test_stored_callable_method_form(self): + class Node: + def fn(self, x): + return "method" + + def __init__(self, fn): + self.fn = fn + + def run(self, x): + return self.fn(x) + + a = Node(lambda x: x + 1) + b = Node(lambda x: x * 2) + for i in range(N): + self.assertEqual(a.run(i), i + 1) + self.assertEqual(b.run(i), 2 * i) + a.fn = lambda x: -x + self.assertEqual(a.run(3), -3) + del a.fn + self.assertEqual(a.run(3), "method") + b.__dict__ # publishes the dict + self.assertEqual(b.run(3), 6) + Node.fn = property(lambda self: (lambda x: "prop")) + self.assertEqual(b.run(3), "prop") + + +class Base: + def __new__(cls, *args): + return super().__new__(cls) + + def __init__(self, x): + self.x = x + + def m(self): + return "base" + + +class Explicit(Base): + def __new__(cls, *args): + return super(Explicit, cls).__new__(cls) + + def __init__(self, x): + super(Explicit, self).__init__(x * 2) + + def m(self): + return "explicit+" + super(Explicit, self).m() + + +class SuperFormsTest(unittest.TestCase): + def test_explicit_form(self): + for i in range(N): + e = Explicit(i) + self.assertEqual(e.x, i * 2) + self.assertEqual(e.m(), "explicit+base") + + def test_explicit_form_errors(self): + def bad(cls, obj): + return super(cls, obj).m + + for _ in range(N): + bad(Explicit, Explicit(1)) + with self.assertRaises(TypeError): + bad(Explicit, Base(1)) + with self.assertRaises(TypeError): + bad(1, Explicit(1)) + + def test_mro_change_is_seen(self): + class A: + def f(self): + return "A" + + class B(A): + def f(self): + return super(B, self).f() + + b = B() + for _ in range(N): + self.assertEqual(b.f(), "A") + A.f = lambda self: "A2" + self.assertEqual(b.f(), "A2") + + +class ObjectInitTest(unittest.TestCase): + def test_object_init_through_super(self): + class O: + def __init__(self, x): + super().__init__() + self.x = x + + for i in range(N): + self.assertEqual(O(i).x, i) + + def test_object_init_excess_arguments(self): + class O: + def __init__(self, *args): + super().__init__(*args) + + for _ in range(N): + O() + with self.assertRaises(TypeError) as cm: + O(1) + self.assertIn("object.__init__() takes exactly one argument", str(cm.exception)) + + def test_dict_payload_at_a_settled_site(self): + class B: + def __init__(self, *args): + super().__init__(*args) + + class D(dict, B): + def __init__(self, *args): + dict.__init__(self, *args) + # `object.__init__` follows `B` in the MRO: the site sees + # a dict payload after settling on plain instances. + B.__init__(self) + + for _ in range(N): + B() + d = D([("k", 1)]) + self.assertEqual(d, {"k": 1}) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_await_call_entry.py b/tests/regrtest/test_await_call_entry.py new file mode 100644 index 00000000..4d1fadd1 --- /dev/null +++ b/tests/regrtest/test_await_call_entry.py @@ -0,0 +1,231 @@ +"""`await f(...)` of a coroutine function starts the coroutine at once. + +The call that makes the coroutine also starts it, as the `SEND` after +`GET_AWAITABLE` would. Everything an await shows must stay as before: +results, exceptions and their tracebacks, PEP 479's conversion, the +coroutine's frame and state while it runs, suspension through the await, +recursion limits, and trace events. +""" + +import sys +import types +import unittest + + +def drive(coro): + try: + while True: + coro.send(None) + except StopIteration as e: + return e.value + + +@types.coroutine +def suspend(value=None): + return (yield value) + + +async def fib(n): + if n <= 1: + return n + return await fib(n - 1) + await fib(n - 2) + + +async def fail(exc): + raise exc + + +async def await_fail(exc): + return await fail(exc) + + +class Box: + def __init__(self, v): + self.v = v + + async def get(self): + return self.v + + async def total(self): + return await self.get() + await self.get() + + +class AwaitCallEntryTest(unittest.TestCase): + def test_results(self): + self.assertEqual(drive(fib(15)), 610) + self.assertEqual(drive(Box(21).total()), 42) + + def test_exception_and_traceback(self): + try: + drive(await_fail(KeyError("k"))) + except KeyError as e: + tb = e.__traceback__ + names = [] + while tb is not None: + names.append(tb.tb_frame.f_code.co_name) + tb = tb.tb_next + self.assertEqual(names[-3:], ["drive", "await_fail", "fail"]) + + def test_stop_iteration_becomes_runtime_error(self): + with self.assertRaises(RuntimeError) as cm: + drive(await_fail(StopIteration(1))) + self.assertIn("coroutine raised StopIteration", str(cm.exception)) + self.assertIsInstance(cm.exception.__cause__, StopIteration) + + def test_caught_in_caller(self): + async def caller(): + try: + await fail(ValueError("v")) + except ValueError as e: + return e.args + self.assertEqual(drive(caller()), ("v",)) + + def test_frame_and_state_while_running(self): + seen = {} + + async def inner(): + frame = sys._getframe() + coro = frame.f_generator + seen["running"] = coro.cr_running + seen["frame"] = coro.cr_frame is frame + seen["name"] = coro.__qualname__ + seen["back"] = frame.f_back.f_code.co_name + seen["line"] = frame.f_back.f_lineno + return 7 + + async def outer(): + return await inner() + + self.assertEqual(drive(outer()), 7) + self.assertTrue(seen["running"]) + self.assertTrue(seen["frame"]) + self.assertTrue(seen["name"].endswith("inner")) + self.assertEqual(seen["back"], "outer") + self.assertEqual(seen["line"], outer.__code__.co_firstlineno + 1) + + def test_suspension_through_the_await(self): + async def inner(): + got = await suspend("first") + got2 = await suspend("second") + return got + got2 + + async def outer(): + return await inner() * 2 + + coro = outer() + self.assertEqual(coro.send(None), "first") + self.assertEqual(coro.cr_await.cr_code.co_name, "inner") + self.assertFalse(coro.cr_await.cr_running) + self.assertEqual(coro.send(3), "second") + with self.assertRaises(StopIteration) as cm: + coro.send(4) + self.assertEqual(cm.exception.value, 14) + + def test_throw_and_close_while_suspended(self): + log = [] + + async def inner(): + try: + await suspend() + except KeyError: + log.append("caught") + return "recovered" + finally: + log.append("finally") + + async def outer(): + return await inner() + + coro = outer() + coro.send(None) + with self.assertRaises(StopIteration) as cm: + coro.throw(KeyError()) + self.assertEqual(cm.exception.value, "recovered") + self.assertEqual(log, ["caught", "finally"]) + coro = outer() + coro.send(None) + coro.close() + self.assertEqual(log, ["caught", "finally", "finally"]) + + def test_gc_tracking(self): + import gc + import weakref + + class Node: + pass + + seen = {} + + async def inner(node): + coro = sys._getframe().f_generator + seen["tracked"] = gc.is_tracked(coro) + # A cycle through the coroutine, live while it is suspended. + node.coro = coro + await suspend() + + async def outer(node): + await inner(node) + + node = Node() + coro = outer(node) + coro.send(None) + self.assertTrue(seen["tracked"]) + self.assertTrue(gc.is_tracked(node.coro)) + ref = weakref.ref(node) + del node, coro + gc.collect() + self.assertIsNone(ref()) + + def test_recursion_limit(self): + async def deep(n): + return await deep(n + 1) + + with self.assertRaises(RecursionError): + drive(deep(0)) + + def test_renamed_function(self): + async def named(): + return sys._getframe().f_generator.__name__ + + named.__name__ = "renamed" + + async def outer(): + return await named() + + self.assertEqual(drive(outer()), "renamed") + + def test_trace_events(self): + events = [] + + async def inner(): + return 1 + + async def outer(): + return await inner() + + def tracer(frame, event, arg): + if frame.f_code in (inner.__code__, outer.__code__): + events.append((frame.f_code.co_name, event)) + return tracer + + sys.settrace(tracer) + try: + drive(outer()) + finally: + sys.settrace(None) + self.assertEqual( + events, + [ + ("outer", "call"), + ("outer", "line"), + ("inner", "call"), + ("inner", "line"), + ("inner", "return"), + ("outer", "exception"), + ("outer", "return"), + ], + ) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_await_native_bodies.py b/tests/regrtest/test_await_native_bodies.py new file mode 100644 index 00000000..e2050945 --- /dev/null +++ b/tests/regrtest/test_await_native_bodies.py @@ -0,0 +1,194 @@ +"""Coroutine and `yield from` bodies once they're compiled: the native code +runs `GET_AWAITABLE`, `GET_YIELD_FROM_ITER`, `SEND` and `END_SEND` (see +`frame_jit` in the VM). + +Each case warms a body until it compiles, then checks a behavior at the +boundary between the native code and the core loop: results, raises, +suspensions, `throw`/`close`, introspection of the delegate, and errors +for bad awaitables. +""" + +import types +import unittest + +WARM = 30000 + + +def drive(coro): + try: + while True: + coro.send(None) + except StopIteration as e: + return e.value + + +async def fib(n): + if n <= 1: + return n + return await fib(n - 1) + await fib(n - 2) + + +class Suspend: + def __await__(self): + value = yield "suspended" + return value + + +async def waiter(n): + total = 0 + for i in range(n): + total += await Suspend() or i + return total + + +async def leaf(x): + if x < 0: + raise ValueError(x) + return x * 2 + + +async def caller(x): + return await leaf(x) + 1 + + +class Tree: + __slots__ = ("left", "value", "right") + + def __init__(self, left, value, right): + self.left = left + self.value = value + self.right = right + + def __iter__(self): + if self.left: + yield from self.left + yield self.value + if self.right: + yield from self.right + + +def build(lo, hi): + if lo >= hi: + return None + mid = (lo + hi) // 2 + return Tree(build(lo, mid), mid, build(mid + 1, hi)) + + +def delegator(it): + result = yield from it + return result + + +def returner(n): + yield n + return n * 10 + + +class AwaitNativeTests(unittest.TestCase): + def test_fib(self): + for _ in range(3): + drive(fib(15)) + self.assertEqual(drive(fib(20)), 6765) + + def test_suspend_and_send(self): + for _ in range(WARM // 100): + drive(waiter(100)) + coro = waiter(3) + self.assertEqual(coro.send(None), "suspended") + self.assertIsNotNone(coro.cr_await) + self.assertEqual(coro.send(10), "suspended") + self.assertEqual(coro.send(None), "suspended") + with self.assertRaises(StopIteration) as cm: + coro.send(None) + self.assertEqual(cm.exception.value, 10 + 1 + 2) + self.assertIsNone(coro.cr_await) + + def test_raise_through_await(self): + for i in range(WARM): + drive(caller(i)) + try: + drive(caller(-5)) + except ValueError as e: + exc = e + else: + self.fail("no ValueError") + self.assertEqual(exc.args, (-5,)) + names = [] + tb = exc.__traceback__ + while tb is not None: + names.append(tb.tb_frame.f_code.co_name) + tb = tb.tb_next + self.assertEqual(names[-2:], ["caller", "leaf"]) + + def test_throw_and_close(self): + for _ in range(WARM // 100): + drive(waiter(100)) + coro = waiter(5) + coro.send(None) + with self.assertRaises(KeyError): + coro.throw(KeyError("x")) + coro = waiter(5) + coro.send(None) + coro.close() + self.assertIsNone(coro.cr_frame) + + def test_bad_awaitables(self): + async def bad(): + return await 5 + + async def twice(): + c = leaf(1) + gen = c.__await__() + next(gen, None) + return await c + + for i in range(WARM): + drive(caller(i)) + with self.assertRaises(TypeError): + drive(bad()) + with self.assertRaises(RuntimeError): + drive(twice()) + + def test_types_coroutine(self): + @types.coroutine + def legacy(): + value = yield "legacy" + return value + + async def uses(n): + return await legacy() + n + + for i in range(WARM // 10): + c = uses(i) + c.send(None) + try: + c.send(1) + except StopIteration as e: + self.assertEqual(e.value, i + 1) + + def test_yield_from_tree(self): + tree = build(0, 200) + for _ in range(200): + self.assertEqual(sum(tree), sum(range(200))) + self.assertEqual(list(tree), list(range(200))) + it = iter(tree) + self.assertEqual(next(it), 0) + self.assertIsNotNone(it.gi_yieldfrom) + self.assertEqual(next(it), 1) + it.close() + self.assertIsNone(it.gi_frame) + + def test_yield_from_return_value(self): + for i in range(WARM): + list(delegator(returner(i))) + gen = delegator(returner(4)) + self.assertEqual(next(gen), 4) + with self.assertRaises(StopIteration) as cm: + next(gen) + self.assertEqual(cm.exception.value, 40) + gen = delegator(iter([1, 2])) + self.assertEqual(list(gen), [1, 2]) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_call_kw_core_specialization.py b/tests/regrtest/test_call_kw_core_specialization.py new file mode 100644 index 00000000..0e457529 --- /dev/null +++ b/tests/regrtest/test_call_kw_core_specialization.py @@ -0,0 +1,186 @@ +"""Keyword call sites specialized from the core loop keep exact binding +semantics: a site that changes callee, defaults replaced after the site +specialized, binder errors, keyword-only and `**kwargs` callees, and +argument lifetimes.""" + +import gc + + +def run(fn, n=300): + for _ in range(n): + fn() + + +# One site, a callee that changes shape between executions. +def f_ab(a, b=2, c=3): + return ("ab", a, b, c) + + +def f_ba(a, c=30, b=20): + return ("ba", a, b, c) + + +def f_kwargs(a, **kw): + return ("kw", a, sorted(kw.items())) + + +def f_kwonly(a, *, b, c=7): + return ("ko", a, b, c) + + +def f_args(a, *rest, b=0, c=0): + return ("args", a, rest, b, c) + + +def call_site(f): + return f(1, b=2, c=3) + + +expected = { + f_ab: ("ab", 1, 2, 3), + f_ba: ("ba", 1, 2, 3), + f_kwargs: ("kw", 1, [("b", 2), ("c", 3)]), + f_kwonly: ("ko", 1, 2, 3), + f_args: ("args", 1, (), 2, 3), +} +order = [f_ab] * 50 + [f_ba] * 50 + [f_kwargs] * 50 + [f_kwonly] * 50 + [f_args] * 50 +for _ in range(4): + for f in order: + assert call_site(f) == expected[f], (f, call_site(f)) + order.reverse() + + +# Defaults replaced after the site has run many times. +def g(a, b=2, c=3): + return (a, b, c) + + +def call_g(): + return g(1, b=5) + + +for _ in range(300): + assert call_g() == (1, 5, 3) +g.__defaults__ = (20, 30) +for _ in range(50): + assert call_g() == (1, 5, 30) +g.__defaults__ = None +for _ in range(50): + try: + call_g() + except TypeError as e: + assert "missing 1 required positional argument: 'c'" in str(e), str(e) + else: + raise AssertionError("expected TypeError") +g.__defaults__ = (2, 3) +g.__kwdefaults__ = None +for _ in range(50): + assert call_g() == (1, 5, 3) + + +# Binder errors keep CPython's messages at a warm site. +def h(a, b=2): + return (a, b) + + +def bad_dup(): + return h(1, a=2) + + +def bad_name(): + return h(1, z=2) + + +for _ in range(200): + assert h(1, b=3) == (1, 3) +for fn, msg in [ + (bad_dup, "h() got multiple values for argument 'a'"), + (bad_name, "h() got an unexpected keyword argument 'z'"), +]: + for _ in range(100): + try: + fn() + except TypeError as e: + assert str(e) == msg, str(e) + else: + raise AssertionError("expected TypeError") + + +# Positional-only parameters can't bind by keyword; `**kwargs` collects +# the name instead. +def po(a, /, **kw): + return (a, kw) + + +def call_po(): + return po(1, a=2) + + +for _ in range(300): + assert call_po() == (1, {"a": 2}) + + +# A keyword naming the sixteenth parameter slot (as +# `dataclasses.make_dataclass(..., decorator=...)` does). +def sixteen(p0, p1, *, k2=2, k3=3, k4=4, k5=5, k6=6, k7=7, k8=8, k9=9, + k10=10, k11=11, k12=12, k13=13, k14=14, last=None): + return (p0, p1, k14, last) + + +def call_sixteen(): + return sixteen(0, 1, k14="a", last="b") + + +for _ in range(300): + assert call_sixteen() == (0, 1, "a", "b") + + +# Methods called with keywords through the elided self slot. +class K: + def m(self, a, b=0, c=0): + return (self.tag, a, b, c) + + def __init__(self, tag): + self.tag = tag + + +ks = [K(i) for i in range(3)] + + +def call_m(k): + return k.m(1, c=3) + + +for _ in range(200): + for k in ks: + assert call_m(k) == (k.tag, 1, 0, 3) + + +# A keyword argument's last reference dies with the call. +class Tracked: + alive = 0 + + def __init__(self): + Tracked.alive += 1 + + def __del__(self): + Tracked.alive -= 1 + + +def take(a, b=None): + return a + + +def call_take(): + take(1, b=Tracked()) + return Tracked.alive + + +gc.disable() +try: + for _ in range(300): + assert call_take() == 0 +finally: + gc.enable() + +print("ok") diff --git a/tests/regrtest/test_call_release_timing.py b/tests/regrtest/test_call_release_timing.py new file mode 100644 index 00000000..76f3ba86 --- /dev/null +++ b/tests/regrtest/test_call_release_timing.py @@ -0,0 +1,157 @@ +"""A call's released arguments and locals finalize before the caller goes on. + +CPython runs a `__del__` inside the decrement that drops the last +reference: an argument only the call held dies when the call's operands +are released, and a callee's local dies with its frame, both before the +caller's next instruction. The call paths that finish a call in place (a +frameless leaf callee, a store-only constructor, a compiled callee's +direct return) must run the finalizer just as promptly, in the +interpreter's core loop, in the frame JIT, and in tier 2. +""" + +import os +import subprocess +import sys +import unittest + +N = 3000 +MODE = "--mode" + + +class Tracked: + log = [] + + def __init__(self, name): + self.name = name + + def __del__(self): + Tracked.log.append(self.name) + + +class Bare: + def __del__(self): + Tracked.log.append(None) + + +class Keeps: + __slots__ = ("kept",) + + def __init__(self, kept, dropped): + self.kept = kept + + +class KeepsDict: + def __init__(self, kept, dropped): + self.kept = kept + + +def first(kept, dropped): + return kept + + +def make(i): + t = Tracked(i) + return i + 1 + + +def leaf_loop(n, log): + s = 0 + for i in range(n): + s += first(i, Bare()) + log.append(len(Tracked.log)) + return s + + +def slot_ctor_loop(n, log): + for i in range(n): + k = Keeps(i, Bare()) + log.append(len(Tracked.log)) + return k + + +def dict_ctor_loop(n, log): + for i in range(n): + k = KeepsDict(i, Bare()) + log.append(len(Tracked.log)) + return k + + +def local_loop(n, log): + s = 0 + for i in range(n): + s += make(i) + log.append(len(Tracked.log)) + return s + + +def builtin_loop(n, log): + s = 0 + for i in range(n): + s += len([Bare()]) + log.append(len(Tracked.log)) + return s + + +# Tier 2 keeps a loop's temporaries pinned past their last use (the +# interpreter and the frame JIT release them at once). +PINS = sys.implementation.name == "weavepy" and MODE not in sys.argv + + +class CallReleaseTimingTest(unittest.TestCase): + def setUp(self): + Tracked.log.clear() + + def check(self, run, expect_result=None): + log = [] + r = run(N, log) + if expect_result is not None: + self.assertEqual(r, expect_result) + self.assertEqual(log, list(range(1, N + 1))) + return r + + @unittest.skipIf(PINS, "tier 2 pins the temporary argument") + def test_leaf_call_argument(self): + self.check(leaf_loop, sum(range(N))) + + @unittest.skipIf(PINS, "tier 2 pins the temporary argument") + def test_slot_constructor_argument(self): + self.assertEqual(self.check(slot_ctor_loop).kept, N - 1) + + @unittest.skipIf(PINS, "tier 2 pins the temporary argument") + def test_dict_constructor_argument(self): + self.assertEqual(self.check(dict_ctor_loop).kept, N - 1) + + @unittest.skipIf(PINS, "tier 2 pins the temporary argument") + def test_leaf_builtin_argument(self): + self.check(builtin_loop, N) + + def test_callee_local(self): + self.check(local_loop, sum(range(1, N + 1))) + + def test_other_tiers(self): + if MODE in sys.argv: + self.skipTest("already in a mode") + modes = { + # The frame JIT compiling small bodies at once (tier 2 off). + "frame-jit": dict( + WEAVEPY_JIT="0", + WEAVEPY_FRAME_JIT_TUNE="8,1,3,0", + WEAVEPY_FRAME_JIT_HOT="50", + ), + # The interpreter's core loop alone. + "core-loop": dict(WEAVEPY_JIT="0", WEAVEPY_FRAME_JIT="0"), + } + for name, extra in modes.items(): + env = dict(os.environ) + env.update(extra) + r = subprocess.run( + [sys.executable, __file__, MODE], + env=env, + capture_output=True, + text=True, + ) + self.assertEqual(r.returncode, 0, name + ": " + r.stderr) + + +if __name__ == "__main__": + unittest.main(argv=[a for a in sys.argv if a != MODE]) diff --git a/tests/regrtest/test_class_call_keywords.py b/tests/regrtest/test_class_call_keywords.py new file mode 100644 index 00000000..7067e6ec --- /dev/null +++ b/tests/regrtest/test_class_call_keywords.py @@ -0,0 +1,196 @@ +"""Constructing classes with keyword arguments keeps the generic binder's +semantics: defaults, keyword-only and variadic `__init__`s, binder error +messages, `__init__` returning non-None, a changed `__init__` or +`__defaults__`, metaclass `__call__`, abstract classes, custom `__new__`, +and argument lifetimes.""" + +import abc +import gc + + +class Point: + def __init__(self, x, y=0, z=0): + self.x = x + self.y = y + self.z = z + + +def make_point(): + return Point(1, z=3) + + +for _ in range(300): + p = make_point() + assert (p.x, p.y, p.z) == (1, 0, 3) + + +class KwOnly: + def __init__(self, a, *, b, c=5): + self.v = (a, b, c) + + +class Var: + def __init__(self, *args, **kw): + self.v = (args, sorted(kw.items())) + + +class VarSelf: + def __init__(self, a, *rest, **kw): + self.v = (a, rest, sorted(kw.items())) + + +for _ in range(300): + assert KwOnly(1, b=2).v == (1, 2, 5) + assert KwOnly(a=1, b=2, c=3).v == (1, 2, 3) + assert Var(1, b=2).v[1] == [("b", 2)] + assert len(Var(1, b=2).v[0]) == 1 + assert VarSelf(1, 2, k=3).v == (1, (2,), [("k", 3)]) + + +def expect_type_error(fn, msg): + for _ in range(100): + try: + fn() + except TypeError as e: + assert str(e) == msg, (str(e), msg) + else: + raise AssertionError("expected TypeError: " + msg) + + +expect_type_error(lambda: Point(1, w=2), "Point.__init__() got an unexpected keyword argument 'w'") +expect_type_error(lambda: Point(1, x=2), "Point.__init__() got multiple values for argument 'x'") +expect_type_error(lambda: Point(self=1, x=2), "Point.__init__() got multiple values for argument 'self'") +expect_type_error(lambda: Point(y=2), "Point.__init__() missing 1 required positional argument: 'x'") +expect_type_error(lambda: KwOnly(1, c=2), "KwOnly.__init__() missing 1 required keyword-only argument: 'b'") + + +class ReturnsValue: + def __init__(self, a=0): + self.a = a + return a + + +expect_type_error(lambda: ReturnsValue(a=1), "__init__() should return None, not 'int'") +for _ in range(50): + assert ReturnsValue(a=None).a is None + + +# `__init__` and its defaults changed after the site warmed up. +class Changing: + def __init__(self, a, b=1): + self.v = ("first", a, b) + + +def make_changing(): + return Changing(1, b=2) + + +for _ in range(300): + assert make_changing().v == ("first", 1, 2) + + +def second(self, a, b=10, c=20): + self.v = ("second", a, b, c) + + +Changing.__init__ = second +for _ in range(100): + assert make_changing().v == ("second", 1, 2, 20) +second.__defaults__ = (100, 200) +for _ in range(100): + assert make_changing().v == ("second", 1, 2, 200) +second.__defaults__ = None +expect_type_error(make_changing, "second() missing 1 required positional argument: 'c'") + + +# A metaclass `__call__` intercepts construction. +class Meta(type): + def __call__(cls, *args, **kw): + obj = super().__call__(*args, **kw) + obj.via_meta = True + return obj + + +class WithMeta(metaclass=Meta): + def __init__(self, a, b=0): + self.v = (a, b) + + +for _ in range(200): + w = WithMeta(1, b=2) + assert w.v == (1, 2) and w.via_meta + + +# Abstract classes refuse instantiation whatever the arguments. +class Base(abc.ABC): + @abc.abstractmethod + def f(self): + pass + + def __init__(self, a=0): + self.a = a + + +expect_type_error( + lambda: Base(a=1), + "Can't instantiate abstract class Base without an implementation for abstract method 'f'", +) + + +# A custom `__new__` sees the keywords too. +class WithNew: + def __new__(cls, *args, **kw): + obj = super().__new__(cls) + obj.seen = sorted(kw) + return obj + + def __init__(self, a, b=0): + self.v = (a, b) + + +for _ in range(200): + w = WithNew(1, b=2) + assert w.v == (1, 2) and w.seen == ["b"] + + +# Subclass `__init__` chaining with keywords. +class Child(Point): + def __init__(self, x, **kw): + super().__init__(x, **kw) + self.child = True + + +for _ in range(200): + c = Child(1, y=2) + assert (c.x, c.y, c.z, c.child) == (1, 2, 0, True) + + +# A keyword argument's last reference dies with the construction. +class Tracked: + alive = 0 + + def __init__(self): + Tracked.alive += 1 + + def __del__(self): + Tracked.alive -= 1 + + +class Holder: + def __init__(self, a, b=None): + self.a = a + + +def make_holder(): + Holder(1, b=Tracked()) + return Tracked.alive + + +gc.disable() +try: + for _ in range(300): + assert make_holder() == 0 +finally: + gc.enable() + +print("ok") diff --git a/tests/regrtest/test_class_dict_proxy_methods.py b/tests/regrtest/test_class_dict_proxy_methods.py new file mode 100644 index 00000000..b8dacda9 --- /dev/null +++ b/tests/regrtest/test_class_dict_proxy_methods.py @@ -0,0 +1,57 @@ +"""Methods of a class's `__dict__` view (a mappingproxy) at warm call +sites: they read the class's current namespace, refuse writes, and stay +distinct from a proxy over another mapping.""" + +import types + + +class A: + x = 1 + + def f(self): + return 2 + + +for i in range(300): + d = A.__dict__ + assert d.get("x") == 1 + assert d.get("missing") is None + assert d.get("missing", i) == i + assert "f" in d.keys() + assert d["x"] == 1 + assert ("x", 1) in d.items() + assert 1 in d.values() + assert d.copy()["x"] == 1 and type(d.copy()) is dict + assert "x" in d and "nope" not in d + assert len(d) == len(dict(d)) + assert set(iter(d)) == set(d.keys()) + +# The view follows the class. +A.y = 5 +for _ in range(100): + assert A.__dict__.get("y") == 5 +del A.y +for _ in range(100): + assert A.__dict__.get("y", "gone") == "gone" + +# Writes are refused. +try: + A.__dict__["z"] = 1 +except TypeError: + pass +else: + raise AssertionError("expected TypeError") + + +# A proxy over a dict subclass calls the subclass's own methods. +class Loud(dict): + def get(self, k, default=None): + return ("loud", k) + + +proxy = types.MappingProxyType(Loud(a=1)) +for _ in range(300): + assert proxy.get("a") == ("loud", "a") + assert A.__dict__.get("x") == 1 + +print("ok") diff --git a/tests/regrtest/test_class_verdict_memo.py b/tests/regrtest/test_class_verdict_memo.py new file mode 100644 index 00000000..fc6c51c3 --- /dev/null +++ b/tests/regrtest/test_class_verdict_memo.py @@ -0,0 +1,73 @@ +"""Per-class verdicts memoized in the type cache follow class changes. + +`getattr(obj, "__deepcopy__", None)` decides a missing dunder from the +class once per class version, and `object.__reduce_ex__` decides the +plain `copyreg.__newobj__` reduction the same way. Adding the attribute +to the class or a base, a `__getattr__`, a `__getstate__`, or +`__getnewargs__` after warm-up must change the answer, and an instance +attribute must still win per instance. +""" + +import copy +import copyreg +import unittest + + +class VerdictMemoTest(unittest.TestCase): + def test_missing_dunder_follows_class_changes(self): + class Base: + pass + + class Leaf(Base): + pass + + obj = Leaf() + for _ in range(500): + self.assertIsNone(getattr(obj, "__deepcopy__", None)) + self.assertFalse(hasattr(obj, "__deepcopy__")) + Base.__deepcopy__ = lambda self, memo: "base" + for _ in range(500): + self.assertEqual(obj.__deepcopy__({}), "base") + self.assertIsNotNone(getattr(obj, "__deepcopy__", None)) + del Base.__deepcopy__ + for _ in range(500): + self.assertIsNone(getattr(obj, "__deepcopy__", None)) + obj.__dict__["__deepcopy__"] = "own" + self.assertEqual(getattr(obj, "__deepcopy__", None), "own") + self.assertIsNone(getattr(Leaf(), "__deepcopy__", None)) + Base.__getattr__ = lambda self, name: "dynamic" + self.assertEqual(getattr(Leaf(), "__deepcopy__", None), "dynamic") + + def test_plain_reduction_follows_class_changes(self): + class Base: + pass + + class Point(Base): + def __init__(self, x): + self.x = x + + p = Point(3) + for _ in range(500): + rv = p.__reduce_ex__(4) + self.assertIs(rv[0], copyreg.__newobj__) + self.assertEqual(rv[1], (Point,)) + self.assertEqual(rv[2], {"x": 3}) + self.assertEqual(copy.deepcopy(p).x, 3) + Base.__getstate__ = lambda self: {"x": 42} + for _ in range(500): + self.assertEqual(p.__reduce_ex__(4)[2], {"x": 42}) + self.assertEqual(copy.deepcopy(p).x, 42) + del Base.__getstate__ + Base.__getnewargs__ = lambda self: (7,) + rv = p.__reduce_ex__(4) + self.assertEqual(rv[1], (Point, 7)) + del Base.__getnewargs__ + self.assertEqual(p.__reduce_ex__(4)[1], (Point,)) + + def test_builtin_function_reduction(self): + self.assertEqual(len.__reduce_ex__(4), "len") + self.assertEqual(copy.deepcopy(len), len) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_closure_creation_hot.py b/tests/regrtest/test_closure_creation_hot.py new file mode 100644 index 00000000..a8488570 --- /dev/null +++ b/tests/regrtest/test_closure_creation_hot.py @@ -0,0 +1,105 @@ +"""Functions and closures made per call in warm code. + +A `def` or `lambda` run in a loop is built with its defaults and closure +at once; its cells, defaults, names, module and late binding must match a +function built one attribute at a time. +""" + +import gc +import weakref + +N = 3000 + + +def make_adder(k): + def add(x, scale=2): + return x * scale + k + return add + + +def make_counter(): + count = 0 + + def bump(step=1): + nonlocal count + count += step + return count + return bump + + +def late_binding(n): + fns = [] + for i in range(n): + fns.append(lambda: i) + return [f() for f in fns] + + +total = 0 +for i in range(N): + add = make_adder(i) + total += add(1) + assert add.__defaults__ == (2,) + assert add.__closure__[0].cell_contents == i + assert add.__name__ == 'add' + assert add.__qualname__ == 'make_adder..add' + assert add.__module__ == __name__ + assert add.__kwdefaults__ is None +assert total == sum(2 + i for i in range(N)), total + +counter = make_counter() +for i in range(N): + assert counter() == i + 1 +assert counter(10) == N + 10 +assert counter.__closure__[0].cell_contents == N + 10 + +assert late_binding(5) == [4] * 5 + + +def with_kwdefaults(i): + def f(a, b=i, *, c=i + 1): + return a, b, c + return f + + +for i in range(N): + f = with_kwdefaults(i) + assert f(0) == (0, i, i + 1) + assert f.__kwdefaults__ == {'c': i + 1} + + +# A closure's function dies with its last reference, and a cycle through +# its cell is collected. +class Sentinel: + pass + + +def capture(obj): + def inner(): + return obj + return inner + + +refs = [] +for i in range(100): + s = Sentinel() + refs.append(weakref.ref(s)) + fn = capture(s) + assert fn() is s + del s, fn +assert all(r() is None for r in refs) + + +def cyclic(): + def me(): + return me + return me + + +for i in range(N): + f = cyclic() + assert f() is f +w = weakref.ref(f) +del f +gc.collect() +assert w() is None +print('closure creation: ok') diff --git a/tests/regrtest/test_contains_int_subclass_and_identity.py b/tests/regrtest/test_contains_int_subclass_and_identity.py new file mode 100644 index 00000000..38706396 --- /dev/null +++ b/tests/regrtest/test_contains_int_subclass_and_identity.py @@ -0,0 +1,99 @@ +"""`x in (a, b)` with `int`-subclass members (IntEnum, IntFlag) compares +by value under `int.__eq__`, functions and classes by identity, and any +user `__eq__` (on either side, or on a metaclass) still runs.""" + +import enum + + +class Color(enum.IntEnum): + RED = 1 + GREEN = 2 + + +class Perm(enum.IntFlag): + R = 4 + W = 2 + + +for _ in range(300): + assert Color.RED in (Color.GREEN, Color.RED) + assert Color.RED in (2, 1) + assert 2 in (Color.RED, Color.GREEN) + assert True in (Color.RED,) + assert Color.RED not in (Color.GREEN, 3) + assert Perm.R in (Perm.W, 4) + assert (Perm.R | Perm.W) in (6,) + assert 1.0 in (Color.RED,) + assert Color.GREEN in [0, 2.0] + + +class Loud(int): + calls = 0 + + def __eq__(self, other): + Loud.calls += 1 + return True + + __hash__ = int.__hash__ + + +for _ in range(100): + assert 5 in (Loud(1),) + assert Loud(1) in (7,) +assert Loud.calls == 200 + + +def f(): + pass + + +def g(): + pass + + +class K: + pass + + +for _ in range(300): + assert f in (None, g, f) + assert f not in (None, g, "f", 1, K) + assert K in (int, K) + assert K not in (int, f, None) + assert f in (len, None, f) + assert f not in (len, print) + assert len in (f, len) + assert K not in (len,) + + +class Wild: + calls = 0 + + def __eq__(self, other): + Wild.calls += 1 + return other is f + + +w = Wild() +for _ in range(100): + assert f in (w,) + assert K not in (w,) +assert Wild.calls == 200 + + +class Meta(type): + def __eq__(cls, other): + return other == "anything" + + __hash__ = type.__hash__ + + +class M(metaclass=Meta): + pass + + +for _ in range(100): + assert "anything" in (M,) + assert M in ("anything",) + +print("ok") diff --git a/tests/regrtest/test_core_global_cache.py b/tests/regrtest/test_core_global_cache.py new file mode 100644 index 00000000..07a5c9fd --- /dev/null +++ b/tests/regrtest/test_core_global_cache.py @@ -0,0 +1,118 @@ +"""A `LOAD_GLOBAL` site's cached value follows every namespace change. + +The core loop keeps the value a `LOAD_GLOBAL` site last read, in place, +while the module and builtins dicts are exactly as they were. Rebinding, +deleting, shadowing or unshadowing a name, changing a builtin, and running +the same code against another globals dict must each be seen at once. +""" + +import builtins +import unittest + +G = 1 + + +def read_g(n): + total = 0 + for _ in range(n): + total += G + return total + + +def read_len(xs, n): + total = 0 + for _ in range(n): + total += len(xs) + return total + + +def read_abs(n): + total = 0 + for i in range(n): + total += abs(-i) + return total + + +def read_missing(): + return MISSING_NAME # noqa: F821 + + +class GlobalCacheTest(unittest.TestCase): + def test_rebind(self): + global G + try: + for v in (1, 2, "x", None, 3.5, 7): + G = v + if isinstance(v, str): + self.assertEqual(read_g(0), 0) + continue + if v is None: + with self.assertRaises(TypeError): + read_g(3) + continue + self.assertEqual(read_g(200), v * 200) + finally: + G = 1 + + def test_delete_and_restore(self): + global G + self.assertEqual(read_g(100), 100) + del G + try: + with self.assertRaises(NameError): + read_g(1) + finally: + G = 4 + self.assertEqual(read_g(100), 400) + G = 1 + + def test_builtin_shadowing(self): + xs = [1, 2, 3] + self.assertEqual(read_len(xs, 300), 900) + globals()["len"] = lambda s: 10 + try: + self.assertEqual(read_len(xs, 300), 3000) + finally: + del globals()["len"] + self.assertEqual(read_len(xs, 300), 900) + + def test_builtin_replaced(self): + self.assertEqual(read_abs(300), sum(range(300))) + saved = builtins.abs + builtins.abs = lambda v: 1 + try: + self.assertEqual(read_abs(300), 300) + finally: + builtins.abs = saved + self.assertEqual(read_abs(300), sum(range(300))) + + def test_other_globals(self): + src = "def f(n):\n t = 0\n for _ in range(n):\n t += K\n return t\n" + code = compile(src, "", "exec") + fs = [] + for k in range(4): + ns = {"K": k + 1} + exec(code, ns) + fs.append((ns, ns["f"])) + for _ in range(3): + for k, (ns, f) in enumerate(fs): + self.assertEqual(f(150), (k + 1) * 150) + fs[2][0]["K"] = 100 + self.assertEqual(fs[2][1](10), 1000) + self.assertEqual(fs[1][1](10), 20) + + def test_missing_then_defined(self): + for _ in range(50): + with self.assertRaises(NameError): + read_missing() + globals()["MISSING_NAME"] = 5 + try: + self.assertEqual(read_missing(), 5) + finally: + del globals()["MISSING_NAME"] + with self.assertRaises(NameError): + read_missing() + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_core_loop_handoffs.py b/tests/regrtest/test_core_loop_handoffs.py new file mode 100644 index 00000000..d611b5c6 --- /dev/null +++ b/tests/regrtest/test_core_loop_handoffs.py @@ -0,0 +1,240 @@ +"""The core loop's in-place handoffs and its scalar arms keep exact semantics. + +An instruction the core loop runs out of line (a cache-hit helper, a lane, +or the full leaf arms) goes on in the same loop when the activation is +unchanged. Releases, finalizers, raises, tracebacks and line events must +come out exactly as if every instruction ran on its own, and the unary +arms must agree with the full handler on every operand shape. +""" + +import sys +import unittest +import warnings + + +class Slotted: + __slots__ = ("a",) + + def __init__(self, a): + self.a = a + + +class WithProp: + def __init__(self, v): + self._v = v + + @property + def v(self): + return self._v + + +class Plain: + k = 3 + + +LOG = [] + + +class Noisy: + def __init__(self, tag): + self.tag = tag + + def __del__(self): + LOG.append(("del", self.tag)) + + +def unary_table(values): + out = [] + for v in values: + out.append(not v) + try: + out.append(-v) + except TypeError: + out.append("neg-type") + try: + out.append(~v) + except TypeError: + out.append("inv-type") + return out + + +def handoff_mix(n): + # Attribute and global reads that take the helper, `not` and + # comprehension-free builtins in a loop with plain local arithmetic. + p = WithProp(2) + s = Slotted(5) + total = 0 + for i in range(n): + total += p.v + s.a + Plain.k + len("abc") + abs(-i) + flag = not (i & 1) + if flag: + total -= -i + t = (i, i + 1, i + 2, i + 3) + total += t[3] - t[0] + return total + + +def release_order(n): + for i in range(n): + x = Noisy(i) + LOG.append(("bound", i)) + x = None + LOG.append(("after", i)) + return LOG + + +def raise_in_helper(objs): + seen = 0 + for o in objs: + seen += o.v # line A + return seen + + +class CoreUnaryTest(unittest.TestCase): + def test_unary_shapes(self): + values = [0, 1, -1, 7, 2**62, -(2**63), 2**63 - 1, None, True, False, + 0.0, -1.5, "", "x", (), (1,), [], [0]] + expect = [] + for v in values: + expect.append(not v) + try: + expect.append(-v) + except TypeError: + expect.append("neg-type") + try: + expect.append(~v) + except TypeError: + expect.append("inv-type") + with warnings.catch_warnings(): + warnings.simplefilter("ignore", DeprecationWarning) + for _ in range(50): + got = unary_table(values) + self.assertEqual(got, expect) + # The overflowing negation is a long, not a wrapped int. + self.assertEqual(-(-(2**63)), 2**63) + self.assertEqual(type(not 5), bool) + + def test_invert_bool_warns(self): + with warnings.catch_warnings(record=True) as w: + warnings.simplefilter("always", DeprecationWarning) + for _ in range(3): + unary_table([True]) + self.assertTrue(any(issubclass(x.category, DeprecationWarning) for x in w)) + + +def branch_counts(pairs): + counts = [0] * 6 + for a, b in pairs: + if a < b: + counts[0] += 1 + if a <= b: + counts[1] += 1 + if a == b: + counts[2] += 1 + if not a != b: + counts[3] += 1 + if a > b: + counts[4] += 1 + while a >= b: + counts[5] += 1 + break + return counts + + +def raise_after_compare(xs): + for x in xs: + if x > 2: + raise ValueError(x) # line B + return None + + +class CompareBranchTest(unittest.TestCase): + def test_counts(self): + nan = float("nan") + pairs = [(1, 2), (2, 1), (3, 3), (1.5, 2), (2, 1.5), (2.0, 2), (-1, -1.0), + (2**53, float(2**53)), (2**53 + 1, float(2**53)), (nan, 1.0), + (1.0, nan), (nan, nan), (True, 1), (False, 0.5), (-(2**63), 2**63 - 1)] + expect = [0] * 6 + for a, b in pairs: + expect[0] += a < b + expect[1] += a <= b + expect[2] += a == b + expect[3] += not a != b + expect[4] += a > b + expect[5] += a >= b + for _ in range(100): + self.assertEqual(branch_counts(pairs), expect) + + def test_traceback_line(self): + for _ in range(100): + self.assertIsNone(raise_after_compare([0, 1, 2])) + try: + raise_after_compare([0, 1, 2, 3]) + except ValueError as e: + tb = e.__traceback__ + else: + self.fail("no ValueError") + while tb.tb_next is not None: + tb = tb.tb_next + self.assertEqual(tb.tb_lineno, raise_after_compare.__code__.co_firstlineno + 3) + + +class HandoffTest(unittest.TestCase): + def test_mixed_loop(self): + def reference(n): + total = 0 + for i in range(n): + total += 2 + 5 + 3 + 3 + i + if not (i & 1): + total += i + total += 3 + return total + + for n in (0, 1, 7, 500, 3000): + self.assertEqual(handoff_mix(n), reference(n)) + + def test_release_order(self): + # (Few enough iterations that the loop stays off tier 2.) + LOG.clear() + release_order(30) + expect = [] + for i in range(30): + expect += [("bound", i), ("del", i), ("after", i)] + self.assertEqual(LOG, expect) + + def test_raise_from_helper(self): + objs = [WithProp(1)] * 300 + [Plain()] + try: + raise_in_helper(objs) + except AttributeError as e: + tb = e.__traceback__ + else: + self.fail("no AttributeError") + while tb.tb_next is not None: + tb = tb.tb_next + self.assertEqual(tb.tb_frame.f_code.co_name, "raise_in_helper") + line = raise_in_helper.__code__.co_firstlineno + 3 + self.assertEqual(tb.tb_lineno, line) + + def test_line_events(self): + lines = [] + + def tracer(frame, event, arg): + if frame.f_code is handoff_mix.__code__ and event == "line": + lines.append(frame.f_lineno - handoff_mix.__code__.co_firstlineno) + return tracer + + handoff_mix(50) + sys.settrace(tracer) + try: + r = handoff_mix(3) + finally: + sys.settrace(None) + self.assertEqual(r, handoff_mix(3)) + # Every body line of each iteration, in order. + self.assertEqual(lines.count(10), 2) + self.assertEqual(lines[:4], [3, 4, 5, 6]) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_dict_table.py b/tests/regrtest/test_dict_table.py new file mode 100644 index 00000000..ea8dc89b --- /dev/null +++ b/tests/regrtest/test_dict_table.py @@ -0,0 +1,187 @@ +"""The ordered hash table behind `dict`: order, growth, removal, and keys. + +Covers the shapes the table handles differently: small tables (no slot +index), the switch to an indexed table and its growth, removal from the +front, middle and end (the later entries renumber), keys whose hashes +collide (a key's `__eq__` runs only against keys of equal hash, as in +CPython), a `__eq__` that mutates the dict mid-probe, and the positional +users of the table (iteration, `popitem`, `OrderedDict.move_to_end`, the +`del`-then-reinsert iteration trip-wire, `copy`, and pickling order). +""" + +import pickle +import unittest +from collections import OrderedDict + + +class Collide: + """A key with a fixed hash that counts its `__eq__` calls.""" + + calls = 0 + + def __init__(self, name, h=42): + self.name = name + self.h = h + + def __hash__(self): + return self.h + + def __eq__(self, other): + Collide.calls += 1 + return isinstance(other, Collide) and self.name == other.name + + def __repr__(self): + return f"Collide({self.name!r})" + + +class TableTest(unittest.TestCase): + def test_growth_keeps_order_and_lookups(self): + d = {} + for i in range(2000): + d[i * 1024] = i + if i in (7, 8, 9, 100, 1000): + self.assertEqual(list(d), [k * 1024 for k in range(i + 1)]) + for i in range(2000): + self.assertEqual(d[i * 1024], i) + self.assertNotIn(5, d) + self.assertEqual(len(d), 2000) + + def test_removal_renumbers(self): + for n in (5, 9, 40, 500): + d = {f"k{i}": i for i in range(n)} + keys = list(d) + # Front, middle and end. + for k in (keys[0], keys[n // 2], keys[-1]): + del d[k] + keys.remove(k) + self.assertEqual(list(d), keys) + for kk in keys: + self.assertEqual(d[kk], int(kk[1:])) + # Every other one. + for k in keys[::2]: + self.assertEqual(d.pop(k), int(k[1:])) + keys = keys[1::2] + self.assertEqual(list(d), keys) + d["new"] = -1 + self.assertEqual(list(d)[-1], "new") + self.assertEqual(d.popitem(), ("new", -1)) + + def test_reinsert_goes_last(self): + d = dict.fromkeys(range(20)) + del d[3] + d[3] = "x" + self.assertEqual(list(d)[-1], 3) + self.assertEqual(list(d)[:3], [0, 1, 2]) + + def test_collisions_compare_only_equal_hashes(self): + a, b, c = Collide("a"), Collide("b"), Collide("c", h=7) + d = {a: 1, c: 3} + Collide.calls = 0 + d[b] = 2 + # `b` meets `a` (same hash) once; `c` (other hash) never. + self.assertEqual(Collide.calls, 1) + Collide.calls = 0 + self.assertEqual(d[Collide("c", h=7)], 3) + self.assertEqual(Collide.calls, 1) + self.assertEqual(list(d), [a, c, b]) + many = {Collide(str(i)): i for i in range(50)} + for i in range(50): + self.assertEqual(many[Collide(str(i))], i) + del many[Collide("10")] + self.assertNotIn(Collide("10"), many) + self.assertEqual(len(many), 49) + + def test_eq_mutating_dict(self): + class Evil: + def __init__(self, d): + self.d = d + + def __hash__(self): + return 1 + + def __eq__(self, other): + self.d.clear() + return False + + d = {} + d[Evil(d)] = 1 + # The probe meets the stored key (equal hash), whose `__eq__` + # empties the dict; CPython restarts and finds nothing. + self.assertNotIn(Evil(d), d) + self.assertEqual(len(d), 0) + + def test_unhashable_and_mixed_numeric_keys(self): + d = {1: "int", 2.5: "float", "s": "str", (1, 2): "tuple"} + self.assertEqual(d[1.0], "int") + self.assertEqual(d[True], "int") + self.assertEqual(d[(1, 2)], "tuple") + with self.assertRaises(TypeError): + d[[1]] = 1 + nan = float("nan") + d[nan] = "nan" + self.assertEqual(d[nan], "nan") + + def test_iteration_tripwires(self): + d = {i: i for i in range(12)} + with self.assertRaises(RuntimeError): + for k in d: + d[k + 100] = 0 + d = {i: i for i in range(12)} + with self.assertRaises(RuntimeError): + for k in d: + del d[k] + d[k + 100] = 0 + + def test_copy_update_clear(self): + src = {f"k{i}": i for i in range(30)} + c = src.copy() + c["k3"] = "changed" + self.assertEqual(src["k3"], 3) + self.assertEqual(list(c), list(src)) + c.clear() + self.assertEqual(c, {}) + c.update(src) + self.assertEqual(c, src) + c["extra"] = 1 + self.assertEqual(list(c)[-1], "extra") + + def test_ordered_dict_moves(self): + od = OrderedDict((i, str(i)) for i in range(30)) + od.move_to_end(5) + od.move_to_end(20, last=False) + keys = list(od) + self.assertEqual(keys[-1], 5) + self.assertEqual(keys[0], 20) + self.assertEqual(od.popitem(last=False), (20, "20")) + self.assertEqual(od.popitem(), (5, "5")) + for k in range(30): + if k not in (5, 20): + self.assertEqual(od[k], str(k)) + lru = OrderedDict() + for i in range(500): + k = (i * 7) % 37 + lru[k] = i + lru.move_to_end(k) + if len(lru) > 20: + lru.popitem(last=False) + self.assertEqual(len(lru), 20) + self.assertEqual(list(lru)[-1], (499 * 7) % 37) + + def test_pickle_order(self): + d = {f"k{i}": i for i in range(40)} + for k in list(d)[::3]: + del d[k] + r = pickle.loads(pickle.dumps(d)) + self.assertEqual(list(r.items()), list(d.items())) + + def test_setdefault_and_get(self): + d = {} + for i in range(100): + self.assertEqual(d.setdefault(i % 10, i), i % 10) + self.assertEqual(len(d), 10) + self.assertEqual(d.get(99), None) + self.assertEqual(d.get(99, "x"), "x") + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_direct_call_shapes.py b/tests/regrtest/test_direct_call_shapes.py new file mode 100644 index 00000000..6f67a0a6 --- /dev/null +++ b/tests/regrtest/test_direct_call_shapes.py @@ -0,0 +1,218 @@ +"""Compiled callers call more shapes directly, with the same semantics. + +A compiled function's call of another compiled function runs the callee +from the caller's call helper and finishes its return there. That now +covers callees with cell variables (their own fresh cells), closures (the +function's cells), and calls with keyword arguments; a callee's +`RETURN_VALUE` hands its return straight back; and an eval-breaker +countdown that runs out with no thread waiting for the GIL starts over in +place. Each loop below runs long enough for its functions to compile. +""" + +import sys +import threading +import traceback + +N = 60000 + + +def make_adder(k): + def add(x): + return x + k + + return add + + +def make_counter(): + n = 0 + + def bump(by): + nonlocal n + n += by + return n + + return bump + + +def cell_param(a, b): + def get(): + return a + b + + a += 1 + return get() + + +def closures(): + total = 0 + bump = make_counter() + for i in range(N): + add = make_adder(i) + total += add(1) + add(2) + total += cell_param(i, 1) + bump(2) + expect = sum(2 * i + 3 for i in range(N)) + sum(i + 2 for i in range(N)) + assert total == expect, (total, expect) + assert bump(0) == 2 * N + + +def kw_callee(a, b=1, *, c=2): + return a * 100 + b * 10 + c + + +def kw_positional(a, scale=1): + return a * scale + + +def kw_calls(): + t = 0 + for i in range(N): + t += kw_positional(i, scale=2) + t += kw_callee(1, b=2, c=3) + assert t == sum(2 * i for i in range(N)) + 123 * N, t + + +class Point: + def __init__(self, x, y): + self.x = x + self.y = y + + +def spread_target(a, b, c=0): + if c == -1: + raise KeyError(a) + return a + b + c + + +def spread_calls(): + t = 0 + for i in range(N): + args = (i, 1) + t += spread_target(*args) + t += spread_target(*args, **{"c": 2}) + t += max(*[i, 3, 1]) + p = Point(*args) + t += p.x + p.y + expect = sum((i + 1) + (i + 3) + max(i, 3) + (i + 1) for i in range(N)) + assert t == expect, (t, expect) + try: + spread_target(*(5, 1), c=-1) + except KeyError as e: + assert e.args == (5,) + else: + raise AssertionError("no raise") + + +class Dying: + log = [] + + def __init__(self, name): + self.name = name + + def __del__(self): + Dying.log.append(self.name) + + +def holds_cell(d): + def peek(): + return d.name + + return peek() + + +def del_timing(): + for i in range(N): + Dying.log.clear() + name = holds_cell(Dying(i)) + # The argument dies with the callee's cells, before the caller goes on. + assert Dying.log == [i], (i, Dying.log) + assert name == i + + +def frames_through_closures(): + def inner(depth): + f = sys._getframe() + return (f.f_code.co_name, f.f_back.f_code.co_name, depth) + + def outer(depth): + return inner(depth) + + for i in range(N): + assert outer(i) == ("inner", "outer", i) + + +def raising_closure(): + k = 3 + + def boom(x): + if x == N - 1: + raise ValueError(x + k) + return x + + def call(x): + return boom(x) + + for i in range(N - 1): + assert call(i) == i + try: + call(N - 1) + except ValueError as e: + names = [f.name for f in traceback.extract_tb(e.__traceback__)] + assert names[-2:] == ["call", "boom"], names + assert e.args == (N - 1 + k,) + else: + raise AssertionError("no raise") + + +def recursion_limit(): + def down(n): + def step(): + return n + + if n == 0: + return step() + return down(n - 1) + 1 + + for _ in range(200): + assert down(20) == 20 + old = sys.getrecursionlimit() + sys.setrecursionlimit(200) + try: + down(500) + except RecursionError: + pass + else: + raise AssertionError("no RecursionError") + finally: + sys.setrecursionlimit(old) + + +def busy_thread_hand_off(): + # A compiled loop of direct calls that never blocks must still let a + # thread waiting for the GIL in. + flag = [] + + def worker(): + flag.append(1) + + def spin(i): + return i + 1 + + t = threading.Thread(target=worker) + t.start() + i = 0 + while not flag: + i = spin(i) + if i > 50_000_000: + raise AssertionError("the waiting thread never ran") + t.join() + + +closures() +kw_calls() +spread_calls() +del_timing() +frames_through_closures() +raising_closure() +recursion_limit() +busy_thread_hand_off() +print("direct call shapes: ok") diff --git a/tests/regrtest/test_direct_keyword_calls.py b/tests/regrtest/test_direct_keyword_calls.py new file mode 100644 index 00000000..aa5f9eea --- /dev/null +++ b/tests/regrtest/test_direct_keyword_calls.py @@ -0,0 +1,219 @@ +"""Keyword calls between compiled functions that run the callee directly. + +A hot `CALL_KW` of a plain Python function whose body is compiled binds +the keywords through the site's cached permutation and runs the callee +straight from the caller's native code. Every way such a call can differ +(defaults and keyword-only defaults, a rebound `__defaults__` or +`__kwdefaults__`, a method receiver, a raise, a frame the callee looks +at, a tracer, deep recursion, a finalizer) must behave as the ordinary +call does. +""" + +import sys +import unittest + +N = 3000 +FORCED = "--forced-frame-jit" + + +def kw(a, b=2, *, c=3, d=4): + t = [a, b, c, d] + return t[0] * 1000 + t[1] * 100 + t[2] * 10 + t[3] + + +def kw_loop(n): + s = 0 + for i in range(n): + s += kw(i, c=5) + s += kw(i, b=6) + s += kw(a=i, d=7, b=1) + return s + + +def expected_kw(n): + s = 0 + for i in range(n): + s += i * 1000 + 200 + 50 + 4 + s += i * 1000 + 600 + 30 + 4 + s += i * 1000 + 100 + 30 + 7 + return s + + +class Box: + def __init__(self): + self.n = 0 + + def bump(self, k, *, twice=False): + t = [k] + self.n += t[0] * (2 if twice else 1) + return self.n + + +def method_loop(n): + b = Box() + for i in range(n): + b.bump(i, twice=(i % 2 == 0)) + return b.n + + +def maybe_raise(a, *, at): + t = [a] + if a == at: + raise ValueError(a) + return t[0] + + +def raise_loop(n): + s = 0 + for i in range(n): + s += maybe_raise(i, at=n - 7) + return s + + +def caller_name(a, *, last): + t = [a] + if a == last: + return sys._getframe(1).f_code.co_name + return t[0] + + +def frame_loop(n): + r = None + for i in range(n): + r = caller_name(i, last=n - 3) + if isinstance(r, str): + return r + return r + + +def depth(n, *, step=1): + t = [n] + if t[0] <= 0: + return 0 + return depth(n - step, step=step) + 1 + + +class Tracked: + log = [] + + def __init__(self, name): + self.name = name + + def __del__(self): + Tracked.log.append(self.name) + + +def takes(a, *, dropped): + t = [a] + return t[0] + + +def finalizer_loop(n, log): + s = 0 + for i in range(n): + s += takes(i, dropped=Tracked(i)) + log.append(len(Tracked.log)) + return s + + +def defaults_loop(n): + s = 0 + for i in range(n): + s += kw(i, c=0) + return s + + +class DirectKeywordCallTest(unittest.TestCase): + def test_forced_frame_jit(self): + # The same cases with small bodies compiled by the frame JIT at + # once (tier 2 off), so every call above runs directly. + if FORCED in sys.argv: + self.skipTest("already forced") + import os + import subprocess + + env = dict(os.environ) + env.update( + WEAVEPY_JIT="0", + WEAVEPY_FRAME_JIT_TUNE="8,1,3,0", + WEAVEPY_FRAME_JIT_HOT="50", + ) + r = subprocess.run( + [sys.executable, __file__, FORCED], + env=env, + capture_output=True, + text=True, + ) + self.assertEqual(r.returncode, 0, r.stderr) + + def test_permutations_and_defaults(self): + self.assertEqual(kw_loop(N), expected_kw(N)) + + def test_method_with_keyword_only(self): + expect = sum(i * (2 if i % 2 == 0 else 1) for i in range(N)) + self.assertEqual(method_loop(N), expect) + + def test_rebound_defaults(self): + saved, saved_kw = kw.__defaults__, kw.__kwdefaults__ + try: + self.assertEqual(defaults_loop(N), sum(i * 1000 + 204 for i in range(N))) + kw.__defaults__ = (9,) + self.assertEqual(defaults_loop(N), sum(i * 1000 + 904 for i in range(N))) + kw.__kwdefaults__ = {"c": 3, "d": 8} + self.assertEqual(defaults_loop(N), sum(i * 1000 + 908 for i in range(N))) + finally: + kw.__defaults__, kw.__kwdefaults__ = saved, saved_kw + self.assertEqual(defaults_loop(N), sum(i * 1000 + 204 for i in range(N))) + + def test_raise_propagates_with_traceback(self): + try: + raise_loop(N) + except ValueError as e: + exc = e + else: + self.fail("no raise") + self.assertEqual(exc.args, (N - 7,)) + names = [] + tb = exc.__traceback__ + while tb is not None: + names.append(tb.tb_frame.f_code.co_name) + tb = tb.tb_next + self.assertEqual(names[-2:], ["raise_loop", "maybe_raise"]) + + def test_callee_sees_caller_frame(self): + self.assertEqual(frame_loop(N), "frame_loop") + + def test_recursion(self): + for _ in range(20): + self.assertEqual(depth(200, step=1), 200) + with self.assertRaises(RecursionError): + depth(sys.getrecursionlimit() + 100, step=1) + self.assertEqual(depth(200, step=2), 100) + + def test_finalizer_runs_before_caller_continues(self): + if FORCED not in sys.argv and sys.implementation.name == "weavepy": + self.skipTest("tier 2 pins the temporary argument") + Tracked.log.clear() + log = [] + self.assertEqual(finalizer_loop(N, log), sum(range(N))) + self.assertEqual(log, list(range(1, N + 1))) + + def test_tracer_sees_calls(self): + kw_loop(N) + calls = [] + + def tracer(frame, event, arg): + if event == "call" and frame.f_code is kw.__code__: + calls.append(frame.f_locals["c"]) + return None + + sys.settrace(tracer) + try: + kw_loop(5) + finally: + sys.settrace(None) + self.assertEqual(calls, [5, 3, 3] * 5) + + +if __name__ == "__main__": + unittest.main(argv=[a for a in sys.argv if a != FORCED]) diff --git a/tests/regrtest/test_discarded_instance_pool.py b/tests/regrtest/test_discarded_instance_pool.py new file mode 100644 index 00000000..d77b68e7 --- /dev/null +++ b/tests/regrtest/test_discarded_instance_pool.py @@ -0,0 +1,85 @@ +"""Instances discarded by a statement (`C(...)` whose value is unused). + +A plain instance that dies as a compiled loop pops it goes back to the +instance pool. One owing a finalizer, one with a weak reference or one +another owner still holds must not be pooled, and a pooled instance +reused for another class must carry nothing of its last tenant. +""" + +import gc +import unittest +import weakref + + +class Plain: + def __init__(self, a): + self.a = a + self.b = "b" + + +class Slotted: + __slots__ = ("x", "y") + + def __init__(self, x): + self.x = x + + +class Final: + log = [] + + def __init__(self, tag): + self.tag = tag + + def __del__(self): + Final.log.append(self.tag) + + +class Weak: + __slots__ = ("v", "__weakref__") + + def __init__(self, v): + self.v = v + + +class PoolTest(unittest.TestCase): + def test_discarded_in_a_loop(self): + for i in range(3000): + Plain(i) + Slotted(i) + p = Plain(1) + self.assertEqual(vars(p), {"a": 1, "b": "b"}) + s = Slotted.__new__(Slotted) + self.assertFalse(hasattr(s, "x")) + self.assertFalse(hasattr(s, "y")) + e = Plain.__new__(Plain) + self.assertEqual(vars(e), {}) + + def test_finalizer_runs_at_the_statement(self): + Final.log.clear() + for i in range(500): + Final(i) + self.assertEqual(Final.log[-1], i) + self.assertEqual(len(Final.log), 500) + + def test_weakref_callback(self): + fired = [] + refs = [] + for i in range(300): + w = Weak(i) + refs.append(weakref.ref(w, lambda r, i=i: fired.append(i))) + del w + self.assertEqual(fired, list(range(300))) + self.assertTrue(all(r() is None for r in refs)) + + def test_shared_owner_survives(self): + keep = [] + for i in range(1000): + keep.append(Plain(i)) + Plain(-i) + self.assertEqual([k.a for k in keep], list(range(1000))) + gc.collect() + self.assertEqual(keep[500].b, "b") + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_exception_fast_paths.py b/tests/regrtest/test_exception_fast_paths.py new file mode 100644 index 00000000..d1b14f7b --- /dev/null +++ b/tests/regrtest/test_exception_fast_paths.py @@ -0,0 +1,355 @@ +"""The raise/catch fast paths, the one-step AttributeError and +StopIteration constructions, and compiled `with` statements keep CPython's +observable behavior: handled-exception nesting, chaining, exception fields, +special-method lookup and its invalidation.""" + +import sys +import threading +import contextlib + + +# --- Handled-exception nesting (sys.exc_info, bare raise, context) ------- + +def nested_handlers(): + out = [] + for i in range(300): + try: + raise KeyError(i) + except KeyError as outer: + assert sys.exc_info()[1] is outer + try: + raise ValueError(i) + except ValueError as inner: + assert sys.exc_info()[1] is inner + assert inner.__context__ is outer + assert sys.exc_info()[1] is outer + try: + raise + except KeyError as again: + assert again is outer + assert sys.exc_info() == (None, None, None) + out.append(i) + return len(out) + + +assert nested_handlers() == 300 + + +def reraiser(): + try: + {}["k"] + except KeyError: + raise + + +for _ in range(200): + try: + reraiser() + except KeyError as e: + assert e.args == ("k",) + tb = e.__traceback__ + names = [] + while tb is not None: + names.append(tb.tb_frame.f_code.co_name) + tb = tb.tb_next + assert names == ["", "reraiser"], names + + +# The handled exception dies at the end of its handler. +class Fin(Exception): + dead = 0 + + def __del__(self): + Fin.dead += 1 + + +for i in range(100): + try: + raise Fin() + except Fin: + pass + assert Fin.dead == i + 1, (i, Fin.dead) + + +# except* still splits and rebinds the handled exception. +try: + raise ExceptionGroup("g", [ValueError(1), KeyError(2)]) +except* ValueError as eg: + assert isinstance(sys.exc_info()[1], ExceptionGroup) + assert [type(x) for x in eg.exceptions] == [ValueError] +except* KeyError as eg: + assert [type(x) for x in eg.exceptions] == [KeyError] + + +# --- AttributeError ------------------------------------------------------ + +class Plain: + cls_attr = 1 + + +class WithGetattr: + def __getattr__(self, name): + return name.upper() + + +class Slotted: + __slots__ = ("x",) + + +p = Plain() +for _ in range(300): + try: + p.missing + except AttributeError as e: + assert e.name == "missing" and e.obj is p + assert e.args == ("'Plain' object has no attribute 'missing'",), e.args + assert str(e) == "'Plain' object has no attribute 'missing'" + else: + raise AssertionError("no AttributeError") + assert getattr(p, "missing", 7) == 7 + assert not hasattr(p, "missing") + assert WithGetattr().abc == "ABC" + s = Slotted() + try: + s.x + except AttributeError as e: + assert e.name == "x" + try: + s.y + except AttributeError as e: + assert e.name == "y" and e.obj is s +p.missing = 5 +assert p.missing == 5 +del p.missing +try: + p.missing +except AttributeError as e: + assert e.obj is p + + +# --- StopIteration from a generator's return ----------------------------- + +def gen_ret(v): + yield 1 + return v + + +for v in (None, 0, "x", (1, 2)): + g = gen_ret(v) + next(g) + try: + next(g) + except StopIteration as e: + assert e.value == v + assert e.args == (() if v is None else (v,)), e.args + else: + raise AssertionError("no StopIteration") + + +# --- `with` statements --------------------------------------------------- + +class CM: + def __init__(self): + self.log = [] + + def __enter__(self): + self.log.append("enter") + return self + + def __exit__(self, t, v, tb): + self.log.append(("exit", t)) + return False + + +class Suppress: + def __enter__(self): + return 1 + + def __exit__(self, t, v, tb): + return t is not None and issubclass(t, KeyError) + + +def run_with(n): + cm = CM() + sup = Suppress() + lock = threading.Lock() + rlock = threading.RLock() + total = 0 + for i in range(n): + with cm as c: + assert c is cm + total += 1 + with sup as one: + total += one + {}[i] + with lock, rlock: + with rlock: + total += 1 + with contextlib.suppress(KeyError): + {}[i] + assert not lock.locked() + return total, len(cm.log) + + +assert run_with(3000) == (9000, 6000) + + +# The special-method site follows class changes. +class Swap: + def __enter__(self): + return "a" + + def __exit__(self, *a): + return False + + +def enter_value(obj): + with obj as v: + return v + + +for i in range(2000): + assert enter_value(Swap()) == "a" +Swap.__enter__ = lambda self: "b" +assert enter_value(Swap()) == "b" +del Swap.__enter__ +try: + enter_value(Swap()) +except TypeError as e: + assert "context manager" in str(e), e +else: + raise AssertionError("missing __enter__ accepted") + + +# An instance attribute never stands in for the special method. +class OnInstance: + def __enter__(self): + return "class" + + def __exit__(self, *a): + return False + + +o = OnInstance() +o.__enter__ = lambda: "instance" +for _ in range(500): + assert enter_value(o) == "class" + + +# An exception in the body reaches __exit__ with its traceback. +class Seen: + def __enter__(self): + return self + + def __exit__(self, t, v, tb): + self.got = (t, v, tb) + return True + + +for _ in range(200): + s = Seen() + with s: + raise ValueError("body") + t, v, tb = s.got + assert t is ValueError and isinstance(v, ValueError) and tb is v.__traceback__ + + +# `raise ... from None` clears an earlier cause and suppresses the context. +class AppError(Exception): + pass + + +def chained(e): + try: + {}["k"] + except KeyError: + raise e from None + + +for _ in range(300): + err = AppError("x") + assert err.__cause__ is None and err.__suppress_context__ is False + try: + chained(err) + except AppError as caught: + assert caught.__cause__ is None + assert caught.__suppress_context__ is True + assert isinstance(caught.__context__, KeyError) + err.__cause__ = ValueError("old") + try: + chained(err) + except AppError as caught: + assert caught.__cause__ is None, caught.__cause__ + + +# The `as` name's cleanup (`e = None; del e`) unbinds it. +def bound_after(): + try: + raise ValueError + except ValueError as e: + pass + try: + e + except UnboundLocalError: + return True + return False + + +for _ in range(300): + assert bound_after() + + +# A traceback chain across frames survives its exception's handler while +# referenced, and goes when the last reference does. +def deep(n): + if n == 0: + raise KeyError("deep") + deep(n - 1) + + +kept = [] +for i in range(200): + try: + deep(3) + except KeyError as e: + if i % 50 == 0: + kept.append(e.__traceback__) +for tb in kept: + depth = 0 + while tb is not None: + depth += 1 + tb = tb.tb_next + assert depth == 5, depth + + +# An instance's `__dict__` after its split layout keeps names and order. +class Many: + def __init__(self): + for i in range(20): + setattr(self, "a%d" % i, i) + + +for _ in range(200): + m = Many() + d = m.__dict__ + assert list(d) == ["a%d" % i for i in range(20)] + assert d["a7"] == 7 and m.a19 == 19 + d["a7"] = 70 + assert m.a7 == 70 + + +@contextlib.contextmanager +def tagged(log, tag): + log.append(tag) + try: + yield len(log) + finally: + log.pop() + + +log = [] +for i in range(500): + with tagged(log, i) as k: + assert k == 1 and log == [i] +assert log == [] +print("ok") diff --git a/tests/regrtest/test_exception_slot_layout.py b/tests/regrtest/test_exception_slot_layout.py new file mode 100644 index 00000000..80b92b39 --- /dev/null +++ b/tests/regrtest/test_exception_slot_layout.py @@ -0,0 +1,316 @@ +"""Exception pseudo-slots laid out from birth, and handled-exception state. + +An exception instance's `args`, `__traceback__` and chaining links (and a +family's own fields, such as `StopIteration.value`) live in a slot layout +shared by every instance of the shape. Storing a field the layout doesn't +name, deleting one, or reading one that was never set must behave as +before. The handled-exception stack holds only the instances, so +`sys.exc_info()`, bare `raise`, generator suspension inside handlers and +`gen.throw()` chaining must still see the right exception. +""" + +import copy +import io +import pickle +import sys +import unittest + + +def raiser(exc): + raise exc + + +def outer(exc): + raiser(exc) + + +class AppError(Exception): + def __init__(self, code, msg): + super().__init__(msg) + self.code = code + + +class SlottedError(Exception): + __slots__ = ("extra",) + + +class SlotLayoutTest(unittest.TestCase): + def test_defaults_before_raise(self): + for e in (ValueError("x"), StopIteration(3), KeyError("k"), AppError(1, "m")): + self.assertIsNone(e.__traceback__) + self.assertIsNone(e.__context__) + self.assertIsNone(e.__cause__) + self.assertFalse(e.__suppress_context__) + self.assertEqual(StopIteration(3).value, 3) + self.assertIsNone(StopIteration().value) + self.assertEqual(StopIteration(1, 2).args, (1, 2)) + + def test_traceback_chain_across_frames(self): + try: + outer(ValueError("deep")) + except ValueError as e: + tb = e.__traceback__ + names = [] + while tb is not None: + names.append(tb.tb_frame.f_code.co_name) + tb = tb.tb_next + self.assertEqual(names, ["test_traceback_chain_across_frames", "outer", "raiser"]) + + def test_reraise_keeps_and_extends_traceback(self): + def middle(): + try: + raiser(KeyError("k")) + except KeyError: + raise + + try: + middle() + except KeyError as e: + tb = e.__traceback__ + names = [] + while tb is not None: + names.append(tb.tb_frame.f_code.co_name) + tb = tb.tb_next + self.assertEqual(names, ["test_reraise_keeps_and_extends_traceback", "middle", "raiser"]) + + def test_traceback_assignment(self): + try: + raiser(ValueError()) + except ValueError as e: + err = e + err.__traceback__ = None + self.assertIsNone(err.__traceback__) + try: + raise err + except ValueError as e: + self.assertIsNotNone(e.__traceback__) + self.assertIsNone(e.__traceback__.tb_next) + with self.assertRaises(TypeError): + err.__traceback__ = 5 + self.assertIs(err.with_traceback(None), err) + self.assertIsNone(err.__traceback__) + + def test_chaining(self): + try: + try: + raise KeyError("inner") + except KeyError: + raise ValueError("outer") + except ValueError as e: + self.assertIsInstance(e.__context__, KeyError) + self.assertIsNone(e.__cause__) + self.assertFalse(e.__suppress_context__) + try: + try: + raise KeyError("inner") + except KeyError as k: + raise AppError(404, "missing") from None + except AppError as e: + self.assertIsNone(e.__cause__) + self.assertTrue(e.__suppress_context__) + self.assertIsInstance(e.__context__, KeyError) + self.assertEqual(e.code, 404) + self.assertEqual(e.args, ("missing",)) + try: + raise ValueError("v") from TypeError("t") + except ValueError as e: + self.assertIsInstance(e.__cause__, TypeError) + self.assertTrue(e.__suppress_context__) + e = ValueError() + e.__context__ = KeyError() + e.__cause__ = TypeError() + e.__suppress_context__ = False + self.assertIsInstance(e.__context__, KeyError) + self.assertIsInstance(e.__cause__, TypeError) + self.assertFalse(e.__suppress_context__) + e.__context__ = None + self.assertIsNone(e.__context__) + + def test_family_fields(self): + try: + object().missing + except AttributeError as e: + self.assertEqual(e.name, "missing") + self.assertIsInstance(e.obj, object) + self.assertIsNotNone(e.__traceback__) + try: + next(iter(())) + except StopIteration as e: + self.assertIsNone(e.value) + self.assertIsNotNone(e.__traceback__) + + def gen(): + yield 1 + return "done" + + g = gen() + next(g) + try: + next(g) + except StopIteration as e: + self.assertEqual(e.value, "done") + self.assertEqual(e.args, ("done",)) + try: + raise OSError(2, "No such file", "f.txt") + except FileNotFoundError as e: + self.assertEqual((e.errno, e.strerror, e.filename), (2, "No such file", "f.txt")) + self.assertIsNotNone(e.__traceback__) + try: + raise SystemExit(3) + except SystemExit as e: + self.assertEqual(e.code, 3) + self.assertIsNotNone(e.__traceback__) + e = ImportError("no module", name="m", path="/p") + self.assertEqual((e.msg, e.name, e.path), ("no module", "m", "/p")) + + def test_python_init(self): + class NoSuper(Exception): + def __init__(self, a, b): + self.total = a + b + + e = NoSuper(1, 2) + self.assertEqual(e.args, (1, 2)) + self.assertEqual(e.total, 3) + e = AppError(404, "missing") + self.assertEqual(e.args, ("missing",)) + try: + try: + {}["k"] + except KeyError: + raise AppError(5, "five") from None + except AppError as err: + self.assertEqual((err.code, err.args), (5, ("five",))) + self.assertTrue(err.__suppress_context__) + self.assertIsInstance(err.__context__, KeyError) + self.assertIsNotNone(err.__traceback__) + + def test_cycle_through_args(self): + import gc + import weakref + + class Holder: + pass + + class Err(Exception): + def __init__(self, holder): + super().__init__(holder) + + h = Holder() + h.err = Err(h) + ref = weakref.ref(h) + del h + gc.collect() + self.assertIsNone(ref()) + self.assertTrue(gc.is_tracked(Err(Holder()))) + + def test_slotted_subclass(self): + try: + e = SlottedError("x") + e.extra = 5 + raise e + except SlottedError as err: + self.assertEqual(err.extra, 5) + self.assertEqual(err.args, ("x",)) + self.assertIsNotNone(err.__traceback__) + e = SlottedError() + with self.assertRaises(AttributeError): + e.extra + + def test_copy_and_pickle(self): + try: + err = KeyError("seven") + err.code = 7 + raise err + except KeyError as e: + err = e + for clone in (copy.copy(err), pickle.loads(pickle.dumps(err))): + self.assertEqual(clone.args, ("seven",)) + self.assertEqual(clone.code, 7) + self.assertIsNone(clone.__traceback__) + si = pickle.loads(pickle.dumps(StopIteration(4))) + self.assertEqual((si.args, si.value), ((4,), 4)) + + +class HandledStateTest(unittest.TestCase): + def test_exc_info_nesting(self): + self.assertEqual(sys.exc_info(), (None, None, None)) + try: + raise KeyError("a") + except KeyError as a: + self.assertIs(sys.exc_info()[1], a) + self.assertIs(sys.exception(), a) + try: + raise ValueError("b") + except ValueError as b: + self.assertIs(sys.exc_info()[1], b) + self.assertIs(b.__context__, a) + self.assertIs(sys.exc_info()[2], b.__traceback__) + self.assertIs(sys.exc_info()[1], a) + self.assertIsNone(sys.exception()) + + def test_bare_raise_from_helper(self): + def reraise(): + raise + + try: + try: + raise KeyError("k") + except KeyError as k: + original = k + reraise() + except KeyError as e: + self.assertIs(e, original) + + def test_generator_suspended_in_handler(self): + def gen(): + try: + raise KeyError("in gen") + except KeyError: + yield sys.exception() + yield sys.exception() + + g = gen() + first = next(g) + self.assertIsInstance(first, KeyError) + self.assertIsNone(sys.exception()) + try: + raise ValueError("outside") + except ValueError as outside: + self.assertIs(next(g), first) + self.assertIs(sys.exception(), outside) + g.close() + + def test_throw_chains_suspended_handler(self): + def gen(): + try: + raise KeyError("handled") + except KeyError: + yield 1 + + g = gen() + next(g) + with self.assertRaises(ValueError) as cm: + g.throw(ValueError("thrown")) + self.assertIsInstance(cm.exception.__context__, KeyError) + + def test_unraisable_traceback_order(self): + def inner(): + raise RuntimeError("from del") + + class Noisy: + def __del__(self): + inner() + + saved = sys.stderr + sys.stderr = buf = io.StringIO() + try: + Noisy() + finally: + sys.stderr = saved + text = buf.getvalue() + self.assertIn("RuntimeError: from del", text) + self.assertLess(text.index("__del__"), text.index("in inner")) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_exitstack_core_paths.py b/tests/regrtest/test_exitstack_core_paths.py new file mode 100644 index 00000000..2f7c22df --- /dev/null +++ b/tests/regrtest/test_exitstack_core_paths.py @@ -0,0 +1,156 @@ +"""The steps `contextlib.ExitStack` takes on every use, run in the core +loop instead of as slow steps: a function's own dunder attribute store +(`_exit_wrapper.__wrapped__ = callback`), `callback(*args, **kwds)` of a +bound builtin method, `types.MethodType(cm_exit, cm)`, and +`sys.exception()`. Each case runs warm and checks the observable +results against what the general paths give. +""" + +import contextlib +import sys +import types +import unittest + +WARM = 2000 + + +class Manager: + def __init__(self, log): + self.log = log + + def __enter__(self): + self.log.append("enter") + return self + + def __exit__(self, *exc): + self.log.append(("exit", exc[0])) + return False + + +class ExitStackCorePathTests(unittest.TestCase): + def test_exitstack_warm(self): + log = [] + for i in range(WARM): + with contextlib.ExitStack() as stack: + m = stack.enter_context(Manager(log)) + stack.callback(log.append, i) + stack.callback(log.clear) + self.assertIs(m.log, log) + # (Callbacks run last in, first out.) + self.assertEqual(log, [i, ("exit", None)]) + log.clear() + + def test_exitstack_exception(self): + log = [] + for _ in range(WARM // 10): + with self.assertRaises(KeyError): + with contextlib.ExitStack() as stack: + stack.enter_context(Manager(log)) + stack.callback(log.append, "cb") + raise KeyError + self.assertEqual(log, ["enter", "cb", ("exit", KeyError)]) + log.clear() + + def test_function_dunder_attributes(self): + def target(): + pass + + for i in range(WARM): + def wrapper(): + pass + + wrapper.__wrapped__ = target + wrapper.__isabstractmethod__ = bool(i & 1) + wrapper.plain = i + self.assertIs(wrapper.__wrapped__, target) + self.assertEqual( + wrapper.__dict__, + {"__wrapped__": target, "__isabstractmethod__": True, "plain": WARM - 1}, + ) + for _ in range(WARM): + wrapper.__doc__ = "doc" + wrapper.__name__ = "renamed" + wrapper.__qualname__ = "Q.renamed" + wrapper.__module__ = "mod" + self.assertEqual( + (wrapper.__doc__, wrapper.__name__, wrapper.__qualname__, wrapper.__module__), + ("doc", "renamed", "Q.renamed", "mod"), + ) + self.assertNotIn("__doc__", wrapper.__dict__) + self.assertNotIn("__name__", wrapper.__dict__) + with self.assertRaises(TypeError): + wrapper.__name__ = 1 + with self.assertRaises(TypeError): + wrapper.__dict__ = 1 + with self.assertRaises(AttributeError): + wrapper.__globals__ = {} + d = {} + wrapper.__dict__ = d + wrapper.__wrapped__ = 5 + self.assertEqual(d, {"__wrapped__": 5}) + + def test_call_ex_bound_builtin(self): + log = [1, 2, 3] + for i in range(WARM): + args = (i,) + kwds = {} + app = log.append + app(*args, **kwds) + clear = log.clear + if i % 100 == 49: + clear(*(), **{}) + self.assertEqual(log, list(range(WARM - 50, WARM))) + d = {} + upd = d.update + for i in range(WARM): + upd(*({"k": i},), **{}) + upd(*(), **{"j": i}) + self.assertEqual(d, {"k": WARM - 1, "j": WARM - 1}) + with self.assertRaises(TypeError): + log.append(*(1, 2), **{}) + with self.assertRaises(TypeError): + log.append(*(1,), **{"x": 1}) + + def test_method_type(self): + class C: + pass + + def f(self, x): + return (self, x) + + obj = C() + for i in range(WARM): + m = types.MethodType(f, obj) + self.assertIs(m.__self__, obj) + self.assertIs(m.__func__, f) + self.assertEqual(m(4), (obj, 4)) + with self.assertRaises(TypeError): + types.MethodType(f) + + def test_sys_exception(self): + self.assertIsNone(sys.exception()) + seen = [] + for i in range(WARM): + try: + raise ValueError(i) + except ValueError: + seen.append(sys.exception()) + self.assertIs(sys.exc_info()[1], seen[-1]) + self.assertIsNone(sys.exception()) + self.assertEqual(seen[-1].args, (WARM - 1,)) + + def gen(): + try: + raise KeyError("g") + except KeyError: + yield sys.exception() + yield sys.exception() + + g = gen() + first = next(g) + self.assertIsNone(sys.exception()) + self.assertIs(next(g), first) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_float_fixed_format.py b/tests/regrtest/test_float_fixed_format.py new file mode 100644 index 00000000..97d54267 --- /dev/null +++ b/tests/regrtest/test_float_fixed_format.py @@ -0,0 +1,52 @@ +"""Fixed-point float formatting (`'%.Nf'`, `format(x, '.Nf')`) is +correctly rounded. + +Short precisions of moderate magnitudes are formatted in integer +arithmetic; the result must equal the exact binary value rounded half to +even, with the sign kept for negative values that round to zero, at the +edges of that range and past it. +""" + +import random +import struct +import unittest +from fractions import Fraction + + +def reference(x, prec): + q = Fraction(x) * 10**prec + n = round(q) # half to even on the exact value + neg = x < 0 or (x == 0 and str(x).startswith("-")) + digits = str(abs(n)).rjust(prec + 1, "0") + body = digits if prec == 0 else digits[:-prec] + "." + digits[-prec:] + return ("-" if neg else "") + body + + +class FixedFormatTest(unittest.TestCase): + def test_against_exact_rounding(self): + r = random.Random(5) + values = [0.0, -0.0, 0.5, 1.5, 2.5, -2.5, 0.125, 1.005, 2.675, 0.45, + 1e-17, 5e-18, 5e-324, 2.0**53 + 2, 2.0**62, 2.0**63 - 1024, + 2.0**63, 2.0**64, 1e20, -0.04] + for _ in range(250): + values.append(r.uniform(-1e5, 1e5)) + values.append(r.randrange(-10**6, 10**6) / r.choice([8, 1024, 10, 1000])) + values.append(struct.unpack(" 1e30: + continue + for prec in (0, 1, 3, 6, 17, 18): + self.assertEqual("%.*f" % (prec, v), reference(v, prec), (v, prec)) + self.assertEqual(format(v, ".%df" % prec), reference(v, prec), (v, prec)) + + def test_flags(self): + self.assertEqual("%8.3f|%-8.2f|%+.1f" % (1.5, -2.25, 0.05), " 1.500|-2.25 |+0.1") + self.assertEqual(format(-0.0001, "z.2f"), "0.00") + self.assertEqual(format(-0.0001, ".2f"), "-0.00") + self.assertEqual(format(2.0, "#.0f"), "2.") + self.assertEqual(format(1234567.891, ",.2f"), "1,234,567.89") + self.assertEqual(format(0.5, "010.3f"), "000000.500") + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_for_iter_pairs.py b/tests/regrtest/test_for_iter_pairs.py new file mode 100644 index 00000000..98993e0e --- /dev/null +++ b/tests/regrtest/test_for_iter_pairs.py @@ -0,0 +1,116 @@ +"""`for a, b in ...` loops in compiled code, whose `FOR_ITER` hands the pair +straight to the stack (dict items, `enumerate`, `zip`, lists and tuples of +pairs) and `for` loops over dicts and their views: values, unpacking errors, +mutation during iteration, and exhaustion. Each loop runs enough times for +the compiled loop to take it.""" +from collections import OrderedDict + +ROUNDS = 400 + + +def items_sum(d): + t = 0 + for k, v in d.items(): + t += v + return t + + +def keys_list(d): + out = [] + for k in d: + out.append(k) + return out + + +def values_sum(d): + t = 0 + for v in d.values(): + t += v + return t + + +def pairs_of(seq): + out = [] + for a, b in seq: + out.append((b, a)) + return out + + +def enum_pairs(seq): + out = [] + for i, x in enumerate(seq): + out.append(i * 10 + x) + return out + + +def zip_pairs(xs, ys): + out = [] + for a, b in zip(xs, ys): + out.append(a - b) + return out + + +d = {"k%d" % i: i for i in range(30)} +od = OrderedDict((str(i), i) for i in range(10)) +for _ in range(ROUNDS): + assert items_sum(d) == sum(range(30)) + assert keys_list(d) == ["k%d" % i for i in range(30)] + assert values_sum(d) == sum(range(30)) + assert items_sum(od) == 45 + assert pairs_of([(1, 2), (3, 4)]) == [(2, 1), (4, 3)] + assert pairs_of(((1, "a"), (2, "b"))) == [("a", 1), ("b", 2)] + assert pairs_of(["ab", "cd"]) == [("b", "a"), ("d", "c")] + assert pairs_of([[1, 2], (3, 4)]) == [(2, 1), (4, 3)] + assert enum_pairs([5, 6, 7]) == [5, 16, 27] + assert zip_pairs([5, 6, 7], [1, 1]) == [4, 5] + assert items_sum({}) == 0 + + # A wrong-sized item raises from the unpacking. + for bad in ([(1, 2), (1, 2, 3)], [(1, 2), 5], ((1, 2), (3,))): + try: + pairs_of(bad) + except (ValueError, TypeError): + pass + else: + raise AssertionError("bad unpack not detected: %r" % (bad,)) + + # Changing a dict's size during iteration raises. + m = dict(d) + try: + for k, v in m.items(): + if v == 5: + m["new"] = 1 + except RuntimeError as e: + assert "changed size during iteration" in str(e), e + else: + raise AssertionError("dict size change not detected") + m = dict(d) + try: + for k in m: + if k == "k3": + del m["k4"] + except RuntimeError: + pass + else: + raise AssertionError("dict deletion not detected") + # Replacing values in place is allowed. + m = dict(d) + for k, v in m.items(): + m[k] = v + 1 + assert items_sum(m) == sum(range(30)) + 30 + + # A list mutated mid-loop: the iteration sees the change. + seq = [(1, 2), (3, 4)] + out = [] + for a, b in seq: + out.append(a) + if len(seq) < 4: + seq.append((a + 10, b)) + assert out == [1, 3, 11, 13], out + + # An exhausted items iterator stays exhausted. + it = iter(d.items()) + for k, v in it: + pass + assert list(it) == [] +print("for-iter pairs ok") diff --git a/tests/regrtest/test_frame_and_path_accelerators.py b/tests/regrtest/test_frame_and_path_accelerators.py new file mode 100644 index 00000000..6bc08dfb --- /dev/null +++ b/tests/regrtest/test_frame_and_path_accelerators.py @@ -0,0 +1,231 @@ +"""`sys._getframe` materializes one frame and links its `f_back` chain +lazily, a returning activation with a frame object settles without the +general loop, and the native `posix._path_normpath`/`_path_splitroot_ex`, +`time.localtime`/`strftime` and module `hasattr` paths keep CPython's +observable behavior.""" + +import os +import posixpath +import sys +import time + + +# --- Lazily linked frames ---------------------------------------------- + +def walk(depth): + f = sys._getframe(depth) + out = [] + while f is not None: + out.append((f.f_code.co_name, f.f_lineno)) + f = f.f_back + return out + + +def level1(): + return walk(1) + + +def level2(): + return level1() + + +def level3(): + return level2() + + +expected = None +for i in range(500): + got = level3() + if expected is None: + expected = got + assert got == expected, (i, got, expected) +assert [n for n, _ in expected[:3]] == ["level1", "level2", "level3"], expected + + +def keep_caller(): + return sys._getframe(1) + + +def holder(): + fr = keep_caller() + first = fr.f_lineno + x = 1 + second = fr.f_lineno + back = fr.f_back + return first, second, back.f_code.co_name, fr.f_code.co_name, x + + +for i in range(500): + first, second, back_name, name, _ = holder() + assert second == first + 2, (first, second) + assert back_name == "" and name == "holder" + + +def own_frame(): + f = sys._getframe() + a = 1 + line_a = f.f_lineno + b = 2 + line_b = f.f_lineno + return line_a, line_b, f.f_back.f_code.co_name + + +for i in range(500): + la, lb, caller = own_frame() + assert lb == la + 2 and caller == "" + + +def escaping(): + def inner(): + return sys._getframe(1) + local_value = 42 + return inner() + + +for i in range(300): + fr = escaping() + assert fr.f_code.co_name == "escaping" + assert fr.f_locals["local_value"] == 42 + assert fr.f_back is not None and fr.f_back.f_code.co_name == "" + + +def callee_of_departed(): + return sys._getframe(0) + + +def departed_caller(): + return callee_of_departed() + + +for i in range(300): + fr = departed_caller() + # The caller left the stack while the callee's frame lived: its frame + # object was built on the way out. + assert fr.f_back.f_code.co_name == "departed_caller" + assert fr.f_back.f_back.f_code.co_name == "" + + +def gen_frames(): + yield sys._getframe(0).f_back.f_code.co_name + yield sys._getframe(1).f_code.co_name + + +def consume(): + return list(gen_frames()) + + +for i in range(200): + assert consume() == ["consume", "consume"] + +assert sys._getframemodulename(0) == "__main__" + + +# --- posixpath accelerators --------------------------------------------- + +def py_splitroot(p): + p = os.fspath(p) + sep, empty = (b"/", b"") if isinstance(p, bytes) else ("/", "") + if p[:1] != sep: + return empty, empty, p + elif p[1:2] != sep or p[2:3] == sep: + return empty, sep, p[1:] + else: + return empty, p[:2], p[2:] + + +def py_normpath(path): + path = os.fspath(path) + if isinstance(path, bytes): + sep, dot, dotdot = b"/", b".", b".." + else: + sep, dot, dotdot = "/", ".", ".." + if not path: + return dot + _, initial_slashes, path = py_splitroot(path) + new_comps = [] + for comp in path.split(sep): + if not comp or comp == dot: + continue + if (comp != dotdot or (not initial_slashes and not new_comps) + or (new_comps and new_comps[-1] == dotdot)): + new_comps.append(comp) + elif new_comps: + new_comps.pop() + path = initial_slashes + sep.join(new_comps) + return path or dot + + +cases = ["", ".", "..", "/", "//", "///", "////a", "//a/b", "a/b/../..", + "../a", "/../a", "a//b/./c/..", "/a/./b/../c/5", "./", "a/b/", + "..//..", "/..", "x/../../y", "é/./ü/..", "a\x00b/../c", + "/a/\udcff/../b", "//\udcff", "a/../../b/./c//"] +for c in cases: + assert posixpath.normpath(c) == py_normpath(c), c + assert posixpath.splitroot(c) == py_splitroot(c), c + if "\udcff" not in c: + b = c.encode() + assert posixpath.normpath(b) == py_normpath(b), c + assert posixpath.splitroot(b) == py_splitroot(b), c + + +class P: + def __fspath__(self): + return "/a/./b/../c" + + +assert posixpath.normpath(P()) == "/a/c" +assert posixpath.splitroot(P()) == ("", "/", "a/./b/../c") +for bad in (1, None, [1]): + for fn in (posixpath.normpath, posixpath.splitroot): + try: + fn(bad) + except TypeError: + pass + else: + raise AssertionError((fn, bad)) + + +# --- time.struct_time and strftime ------------------------------------ + +t = time.localtime(1700000000.5) +assert len(t) == 9 and tuple(t)[:3] == (t.tm_year, t.tm_mon, t.tm_mday) +assert isinstance(t.tm_zone, str) and isinstance(t.tm_gmtoff, int) +assert time.strftime("%Y", t) == str(t.tm_year) +assert time.strftime("", t) == "" +assert time.strftime("café %Y", t) == "café " + str(t.tm_year) +assert time.strftime("%Y-%m-%d", t) == "%04d-%02d-%02d" % (t.tm_year, t.tm_mon, t.tm_mday) +assert time.mktime(t) == 1700000000.0 + + +# --- hasattr / getattr on modules ------------------------------------- + +assert hasattr(os, "getpid") and not hasattr(os, "no_such_name") +assert getattr(os, "sep") == "/" and getattr(os, "no_such_name", 5) == 5 +assert hasattr(os, "__dict__") and getattr(os, "__name__") == "os" + + +# --- Plain %-formatting ------------------------------------------------- + +assert "%s %s" % ("a", 1) == "a 1" +assert "%s-%d-%i" % ("x", 2, 3) == "x-2-3" +assert "a%%b%s" % ("c",) == "a%bc" +assert "%s|%d|%s" % (True, True, None) == "True|1|None" +assert "%(a)s %(b)d" % {"a": "x", "b": 2} == "x 2" +assert "%(a(b))s" % {"a(b)": 1} == "1" +assert "%s" % {"a": 1} == "{'a': 1}" +assert "%(x)i%%" % {"x": False} == "0%" +assert "%5s|%-3d|" % ("a", 4) == " a|4 |" +assert "%s" % (2 ** 70,) == str(2 ** 70) +for template, args, exc in (("%s", ("a", "b"), TypeError), ("%s %s", ("a",), TypeError), + ("%d", "x", TypeError), ("%(a)s", {}, KeyError), + ("%", (), ValueError)): + try: + template % args + except exc: + pass + else: + raise AssertionError((template, args)) +record = {"asctime": "t", "levelname": "WARNING", "name": "n", "message": "m", "extra": 1} +for i in range(2000): + assert "%(asctime)s %(levelname)s %(name)s: %(message)s" % record == "t WARNING n: m" + assert "%s/%d" % ("p", i) == "p/" + str(i) diff --git a/tests/regrtest/test_frame_jit_builtin_sites.py b/tests/regrtest/test_frame_jit_builtin_sites.py new file mode 100644 index 00000000..5967b730 --- /dev/null +++ b/tests/regrtest/test_frame_jit_builtin_sites.py @@ -0,0 +1,497 @@ +"""Builtin calls from compiled code at sites settled on one builtin. + +A compiled `CALL` whose site settled on a builtin checks the callee against +that builtin by address and runs its leaf half or its body on the operands +in place. A different callee at the same site (a rebound or shadowed +name, another builtin, a Python function) must take the general path; a +body that raises must leave the right traceback; operands must be released +right after the call (`__del__` timing); a body that runs Python code must +see the caller's frame whole and keep the operands alive even when that +code rebinds the caller's locals; and `sys.setprofile` installed from a +callback must see the calls after it. +""" + +import builtins +import os +import subprocess +import sys +import unittest + +FORCED = "--forced-frame-jit" +N = 3000 + + +def lengths(xs, n): + t = 0 + for i in range(n): + t += len(xs) + return t + + +def rebind_len(n): + global len + t = 0 + try: + for i in range(n): + if i == n // 2: + len = lambda x: 100 # noqa: E731 + t += len("ab") + finally: + del len + return t + + +def mixed_callees(n): + fs = [len, abs, str.upper, lambda x: 7] + t = [] + for i in range(n): + f = fs[(i // 50) % len(fs)] + try: + t.append(f("ab")) + except TypeError: + t.append(None) + return t + + +def setdefaults(d, n): + t = 0 + for i in range(n): + t += d.setdefault("a", 2) + t += d.pop("z", 0) + return t + + +def pops(d, keys): + out = [] + for k in keys: + try: + out.append(d.pop(k)) + except KeyError as e: + out.append(("missing", e.args[0], e.__traceback__.tb_lineno)) + return out + + +POP_LINE = pops.__code__.co_firstlineno + 4 + + +def raising_pop(d, n): + for i in range(n): + d.pop(i) + + +class Noisy: + log = [] + + def __init__(self, tag): + self.tag = tag + + def __del__(self): + Noisy.log.append(("del", self.tag)) + + +def del_timing(n): + d = {"k": None} + for i in range(n): + d.setdefault("k", Noisy(i)) + Noisy.log.append(("after", i)) + + +class FrameKey: + """A key whose `__eq__` looks at its caller's frame.""" + + seen = [] + + def __init__(self, v): + self.v = v + + def __hash__(self): + return 1 + + def __eq__(self, other): + f = sys._getframe(1) + while f is not None and f.f_code.co_name != "frame_lookups": + f = f.f_back + FrameKey.seen.append(f.f_lineno if f is not None else None) + return isinstance(other, FrameKey) and self.v == other.v + + +def frame_lookups(d, n): + t = 0 + for i in range(n): + t += d.setdefault(FrameKey(1), 0) + return t + + +LOOKUP_LINE = frame_lookups.__code__.co_firstlineno + 3 + + +class Rebinder: + """A key whose `__eq__` drops the caller's own reference to the dict.""" + + def __hash__(self): + return 2 + + def __eq__(self, other): + f = sys._getframe(1) + while f is not None and f.f_code.co_name != "rebinding": + f = f.f_back + if f is not None: + f.f_locals["d"] = None + return True + + +def rebinding(n): + out = 0 + for i in range(n): + d = {Rebinder(): i} + out += d.setdefault(Rebinder(), -1) + return out + + +class MyList(list): + def append(self, x): + super().append(x * 2) + + +class PlainList(list): + pass + + +def appends(lst, n): + for i in range(n): + lst.append(i) + lst.count(i) + return lst + + +def kw_calls(n): + t = 0 + for i in range(n): + t += int("11", base=2) + len(sorted([3, 1, 2], reverse=True)) + return t + + +def profiled(n, events): + t = 0 + for i in range(n): + if i == n // 2: + sys.setprofile(lambda frame, event, arg: events.append((event, getattr(arg, "__name__", None)))) + t += len("abc") + t += "a,b".count(",") + sys.setprofile(None) + return t + + +def copies(xs): + out = [] + for x in xs: + out.append(x.copy()) + return out + + +class ItemsDict(dict): + def items(self): + return [("overridden", 1)] + + +def all_items(ds): + out = [] + for d in ds: + for k, v in d.items(): + out.append((k, v)) + out.append(len(d.keys()) + len(d.values())) + return out + + +class Index: + def __init__(self, i): + self.i = i + + def __index__(self): + return self.i + + +def inserts(n): + lst = [] + bad = 0 + for i in range(n): + lst.insert(0, i) + lst.insert(True, -i) + lst.insert(Index(-1), i * 2) + lst.reverse() + try: + lst.insert("0", i) + except TypeError: + bad += 1 + return lst, bad + + +class Fmt: + def __format__(self, spec): + return "fmt" + + +def formats(n): + out = [] + for i in range(n): + tmpl = "{}-{}" + out.append(tmpl.format(i, "x")) + out.append(tmpl.format(Fmt(), 1.5)) + return out + + +def set_pops(n): + taken = 0 + s = set() + for i in range(n): + s.add(i) + taken += s.pop() == i + try: + s.pop() + except KeyError as e: + taken += e.__traceback__.tb_lineno == SET_POP_LINE + return taken + + +SET_POP_LINE = set_pops.__code__.co_firstlineno + 7 + + +def bound_appends(n): + y = [] + append = y.append + for i in range(n): + append(i) + return y + + +def type_calls(xs): + out = [] + for x in xs: + out.append((type(x).__name__, len(list()), str(1), int("5"))) + return out + + +def rebound_type(n): + global type + out = [] + try: + for i in range(n): + if i == n // 2: + type = lambda x: "rebound" # noqa: E731 + out.append(type(i)) + finally: + del type + return out + + +def bad_ints(strs): + out = [] + for s in strs: + try: + out.append(int(s)) + except ValueError as e: + out.append((str(e), e.__traceback__.tb_lineno)) + return out + + +BAD_INT_LINE = bad_ints.__code__.co_firstlineno + 4 + + +def errors(n): + out = [] + for i in range(n): + out.append(ValueError("v", i)) + return out + + +class MyDict(dict): + pass + + +def subclass_methods(n): + import collections + + d = MyDict(a=1) + c = collections.Counter("abca") + dd = collections.defaultdict(list) + out = 0 + for i in range(n): + out += d.get("a", 0) + d.get("z", 5) + d.setdefault("k%d" % (i % 3), i) + out += c.get("a") + dd["x"].append(i) + out += len(dd.get("x")) + return out, sorted(d), len(dd["x"]) + + +def unbound_descriptors(n): + bad = 0 + lst = MyList() + for i in range(n): + list.append(lst, i) + try: + list.append({}, i) + except TypeError as e: + bad += "doesn't apply to a 'dict' object" in str(e) + return len(lst), bad + + +class BuiltinSiteTest(unittest.TestCase): + def test_leaf_and_rebinding(self): + self.assertEqual(lengths([1, 2], N), 2 * N) + self.assertEqual(rebind_len(N), (N // 2) * 2 + (N - N // 2) * 100) + self.assertEqual(rebind_len(N), (N // 2) * 2 + (N - N // 2) * 100) + + def test_patched_builtins(self): + saved = builtins.len + try: + self.assertEqual(lengths("abc", N), 3 * N) + builtins.len = lambda x: 1 + self.assertEqual(lengths("abc", N), N) + finally: + builtins.len = saved + self.assertEqual(lengths("abc", N), 3 * N) + + def test_mixed_callees(self): + out = mixed_callees(N) + for i, v in enumerate(out): + want = [2, None, "AB", 7][(i // 50) % 4] + self.assertEqual(v, want, i) + + def test_native_body(self): + self.assertEqual(setdefaults({"a": 1}, N), N) + d = {} + self.assertEqual(setdefaults(d, N), 2 * N) + self.assertEqual(d, {"a": 2}) + + def test_raise_traceback(self): + d = {1: "a", 3: "c"} + out = pops(d, [1, 2, 3, 4] * 1000) + self.assertEqual(out[:4], ["a", ("missing", 2, POP_LINE), "c", ("missing", 4, POP_LINE)]) + try: + raising_pop({}, N) + except KeyError as e: + tb = e.__traceback__ + else: + self.fail("no KeyError") + while tb.tb_next is not None: + tb = tb.tb_next + self.assertEqual(tb.tb_frame.f_code.co_name, "raising_pop") + self.assertEqual(tb.tb_lineno, raising_pop.__code__.co_firstlineno + 2) + + def test_del_timing(self): + Noisy.log.clear() + del_timing(N) + log = Noisy.log + # Each default dies right after its `setdefault`, before the next + # statement. + for i in range(N): + self.assertEqual(log[2 * i : 2 * i + 2], [("del", i), ("after", i)], i) + + def test_callback_sees_frame(self): + FrameKey.seen.clear() + d = {FrameKey(1): 5} + self.assertEqual(frame_lookups(d, N), 5 * N) + self.assertEqual(set(FrameKey.seen), {LOOKUP_LINE}) + + def test_callback_rebinds_receiver(self): + self.assertEqual(rebinding(N), sum(range(N))) + + def test_subclasses(self): + a = appends(MyList(), 500) + self.assertEqual(a, [2 * i for i in range(500)]) + b = appends(PlainList(), 500) + self.assertEqual(b, list(range(500))) + self.assertIs(type(b), PlainList) + + def test_keywords(self): + self.assertEqual(kw_calls(N), N * 6) + + def test_profile_from_compiled_code(self): + events = [] + self.assertEqual(profiled(N, events), N * 4) + calls = [name for ev, name in events if ev == "c_call"] + self.assertEqual(calls.count("len"), N - N // 2) + self.assertEqual(calls.count("count"), N - N // 2) + + def test_method_load_variants(self): + lists = [[i] for i in range(N)] + self.assertEqual(copies(lists), lists) + mixed = [[1], {"a": 1}, {2}, "s"] * 50 + try: + copies(mixed) + except AttributeError as e: + self.assertIn("'str' object has no attribute 'copy'", str(e)) + else: + self.fail("no AttributeError") + out = copies([[1], {"a": 1}, {2}] * 50) + self.assertEqual(out[:3], [[1], {"a": 1}, {2}]) + self.assertEqual([type(x) for x in out[:3]], [list, dict, set]) + + def test_dict_views(self): + ds = [{"a": 1, "b": 2}] * N + [ItemsDict(z=3)] + out = all_items(ds) + self.assertEqual(out[:3], [("a", 1), ("b", 2), 4]) + self.assertEqual(out[-2:], [("overridden", 1), 2]) + + def test_list_insert_reverse(self): + got, bad = inserts(300) + want = [] + for i in range(300): + want.insert(0, i) + want.insert(1, -i) + want.insert(-1, i * 2) + want.reverse() + self.assertEqual(got, want) + self.assertEqual(bad, 300) + + def test_str_format(self): + out = formats(N) + self.assertEqual(out[:4], ["0-x", "fmt-1.5", "1-x", "fmt-1.5"]) + + def test_set_pop(self): + self.assertEqual(set_pops(N), 2 * N) + + def test_bound_method_kernel(self): + self.assertEqual(bound_appends(N), list(range(N))) + + def test_type_sites(self): + out = type_calls([1, "s", 2.0] * 1000) + self.assertEqual(out[:3], [("int", 0, "1", 5), ("str", 0, "1", 5), ("float", 0, "1", 5)]) + out = rebound_type(N) + self.assertEqual(out[: N // 2], [int] * (N // 2)) + self.assertEqual(out[N // 2 :], ["rebound"] * (N - N // 2)) + out = bad_ints(["1", "x", "3"] * 1000) + self.assertEqual(out[:3], [1, ("invalid literal for int() with base 10: 'x'", BAD_INT_LINE), 3]) + errs = errors(N) + self.assertEqual([type(e) for e in errs[:2]], [ValueError, ValueError]) + self.assertEqual(errs[5].args, ("v", 5)) + + def test_subclass_receivers(self): + out, keys, n = subclass_methods(300) + want = sum(1 + 5 + 2 + (i + 1) for i in range(300)) + self.assertEqual(out, want) + self.assertEqual(keys, ["a", "k0", "k1", "k2"]) + self.assertEqual(n, 300) + self.assertEqual(unbound_descriptors(300), (300, 300)) + + def test_forced_frame_jit(self): + if FORCED in sys.argv: + self.skipTest("already forced") + env = dict(os.environ) + env.update( + WEAVEPY_JIT="0", + WEAVEPY_FRAME_JIT_TUNE="8,1,3,0", + WEAVEPY_FRAME_JIT_HOT="50", + ) + r = subprocess.run( + [sys.executable, __file__, FORCED], + env=env, + capture_output=True, + text=True, + ) + self.assertEqual(r.returncode, 0, r.stderr) + + +if __name__ == "__main__": + unittest.main(argv=[a for a in sys.argv if a != FORCED]) diff --git a/tests/regrtest/test_frame_jit_containers.py b/tests/regrtest/test_frame_jit_containers.py new file mode 100644 index 00000000..76e9c5eb --- /dev/null +++ b/tests/regrtest/test_frame_jit_containers.py @@ -0,0 +1,228 @@ +"""The frame JIT's container shortcuts keep Python's semantics. + +Each function runs long enough to be compiled, then meets the shapes its +in-place helpers and method kernels hand back to the general paths: keys +that compare equal across types, subclass receivers with overrides, +non-ASCII strings, out-of-range indices, wrong unpack lengths, misses that +raise, and displaced values whose finalizers must run at once. +""" + +import os +import subprocess +import sys +import unittest + +N = 3000 + + +class Key: + """Equal to (and hashed like) the string it wraps.""" + + def __init__(self, s): + self.s = s + + def __hash__(self): + return hash(self.s) + + def __eq__(self, other): + return other == self.s or (isinstance(other, Key) and other.s == self.s) + + +class Loud: + log = [] + + def __init__(self, name): + self.name = name + + def __del__(self): + Loud.log.append(self.name) + + +class MyList(list): + def append(self, x): + super().append(("wrapped", x)) + + +def method_calls(n, xs, d, s, text): + out = [] + for i in range(n): + xs.append(i) + xs.pop() + out.append(d.get("a")) + out.append(d.get("zz", -1)) + s.add(i & 7) + s.discard(i & 7) + out.append(text.startswith("ab")) + out.append(text.endswith("yz")) + out.append(text.isdigit()) + out.append(text.find("c")) + out.append(text.strip()) + out.append(text.upper()) + return out + + +def subscripts(n, d, xs, t, text, key): + total = 0 + for i in range(n): + total += d[key] + xs[1] + xs[-1] + t[0] + total += len(text[2]) + return total + + +def contains(n, item, seq): + hits = 0 + for i in range(n): + if item in seq: + hits += 1 + return hits + + +def unpacks(n, seq): + total = 0 + for i in range(n): + a, b, c = seq + total += a + b + c + return total + + +def stores(n, d, xs, key, value): + for i in range(n): + d[key] = value + xs[0] = value + return d, xs + + +def iterate(n, text): + out = [] + for i in range(n): + for ch in text: + out.append(ch) + return out + + +def hashes(n, value): + h = 0 + for i in range(n): + h = hash(value) + return h + + +class FrameJitContainerTests(unittest.TestCase): + def test_method_kernels(self): + out = method_calls(N, [1, 2], {"a": 1}, set(), "abcxyz") + self.assertEqual(out[:8], [1, -1, True, True, False, 2, "abcxyz", "ABCXYZ"]) + # Shapes the kernels decline still run correctly. + out = method_calls(5, MyList(), {1.0: "f", "a": 2}, {True}, " ¹²³ ") + self.assertEqual(out[:8], [2, -1, False, False, False, -1, "¹²³", " ¹²³ "]) + self.assertTrue("٣٤".isdigit()) + self.assertTrue("\x1c\x1f ".isspace()) + self.assertEqual("héllo".find("l"), 2) + + def test_list_kernels(self): + xs = [1, 2] + for _ in range(N): + xs.extend(()) + xs.extend(xs) + self.assertEqual(xs, [1, 2, 1, 2]) + m = MyList() + for i in range(3): + m.append(i) + self.assertEqual(m, [("wrapped", 0), ("wrapped", 1), ("wrapped", 2)]) + empty = [] + with self.assertRaises(IndexError): + for _ in range(N): + empty.pop() + + def test_set_kernels(self): + s = {True} + for _ in range(N): + s.add(1) + self.assertEqual(s, {True}) + self.assertIs(next(iter(s)), True) + s.discard(1) + self.assertEqual(s, set()) + with self.assertRaises(KeyError): + for i in range(N): + s.add(i) + s.remove(i) + s.remove(-5) + t = {Key("a")} + for _ in range(N): + t.add("b") + t.discard("b") + t.discard("a") + self.assertEqual(t, set()) + + def test_dict_get_kernel(self): + d = {Key("k"): 5, 2.0: "two"} + for _ in range(N): + v = d.get("k") + self.assertEqual(v, 5) + self.assertEqual(d.get(2), "two") + + def test_subscripts(self): + self.assertEqual(subscripts(4 * N, {"k": 1}, [1, 2, 3], (4,), "abcd", "k"), 4 * N * 11) + with self.assertRaises(KeyError): + subscripts(1, {}, [1, 2, 3], (4,), "abcd", "k") + with self.assertRaises(IndexError): + subscripts(1, {"k": 1}, [1], (4,), "abcd", "k") + self.assertEqual(subscripts(2, {Key("k"): 1}, [1, 2, 3], (4,), "héllo", "k"), 22) + self.assertEqual(subscripts(2, {(1, "a"): 1}, [1, 2, 3], (4,), "abcd", (1, "a")), 22) + + def test_contains(self): + self.assertEqual(contains(N, "c", "abcd"), N) + self.assertEqual(contains(N, 3, {1.5, 3.0}), N) + self.assertEqual(contains(N, "a", {Key("a")}), N) + self.assertEqual(contains(10, Key("x"), ["y", "x"]), 10) + with self.assertRaises(TypeError): + contains(1, 3, "abc") + + def test_unpacks(self): + self.assertEqual(unpacks(N, (1, 2, 3)), N * 6) + self.assertEqual(unpacks(N, [1, 2, 3]), N * 6) + self.assertEqual(unpacks(3, range(1, 4)), 18) + with self.assertRaises(ValueError): + unpacks(1, (1, 2)) + with self.assertRaises(ValueError): + unpacks(1, [1, 2, 3, 4]) + + def test_stores(self): + d, xs = stores(4 * N, {}, [0], "k", 7) + self.assertEqual((d, xs), ({"k": 7}, [7])) + d, xs = stores(1, {Key("k"): 0}, [0], "k", 1) + self.assertEqual(list(d.values()), [1]) + with self.assertRaises(IndexError): + stores(1, {}, [], "k", 1) + # A displaced value's finalizer runs before the next statement. + Loud.log.clear() + d = {"k": Loud("old")} + xs = [Loud("old-item")] + stores(1, d, xs, "k", 0) + self.assertEqual(Loud.log, ["old", "old-item"]) + + def test_iteration(self): + self.assertEqual(iterate(N, "ab")[:4], ["a", "b", "a", "b"]) + self.assertEqual(iterate(1, "héé"), ["h", "é", "é"]) + + def test_hash(self): + self.assertEqual(hashes(N, -1), -2) + self.assertEqual(hashes(N, (1, "a")), hash((1, "a"))) + self.assertEqual({(1, "a"): 1}[(1, "a")], 1) + nan = float("nan") + self.assertEqual(hashes(3, nan), hash(nan)) + self.assertEqual(hashes(3, (1, 2.5)), hash((1, 2.5))) + + + @unittest.skipIf(os.environ.get("WEAVEPY_TIER2") == "0", "already without tier 2") + def test_without_tier2(self): + # Tier 2 takes some of these loops first: run them all again with + # it off, so the frame JIT compiles every one. + env = dict(os.environ, WEAVEPY_TIER2="0") + r = subprocess.run( + [sys.executable, __file__], env=env, capture_output=True, text=True, timeout=120 + ) + self.assertEqual(r.returncode, 0, r.stderr[-2000:]) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_frame_live_lineno.py b/tests/regrtest/test_frame_live_lineno.py new file mode 100644 index 00000000..0bad8cd1 --- /dev/null +++ b/tests/regrtest/test_frame_live_lineno.py @@ -0,0 +1,213 @@ +"""A frame object of a live activation reports the line its activation +is at, however the activation runs (interpreted, inline, or compiled once +hot), and a frame object outliving its activation keeps the line it left +at. Each check runs cold and again once its loops and callees are hot.""" + +import sys + +N = 30000 + +with open(__file__) as _f: + _SRC = _f.read().splitlines() + + +def L(tag): + """The line carrying the marker comment `tag`.""" + marker = "# " + tag + (line,) = [i + 1 for i, s in enumerate(_SRC) if s.endswith(marker)] + return line + + +def self_reads(n): + fr = sys._getframe() + bad = 0 + for i in range(n): + a = fr.f_lineno # sr-a + x = i + 1 + b = fr.f_lineno # sr-b + if (a, b) != (L("sr-a"), L("sr-b")): + bad += 1 + return bad + + +def self_getattr(n): + fr = sys._getframe() + seen = set() + for i in range(n): + seen.add(getattr(fr, "f_lineno")) # sg-a + seen.add(getattr(fr, "f_lineno")) # sg-b + return sorted(seen) + + +def keep(): + return sys._getframe(1) + + +def held_by_callee_then_read(a): + fr = keep() + x = a + 1 + first = fr.f_lineno # hc-a + y = x * 2 + return fr, first, fr.f_lineno # hc-b + + +F = None + + +def stores_own_frame(a): + global F + F = sys._getframe() + x = a + 1 + return x # so-ret + + +def returns_own_frame(a): + fr = sys._getframe() + x = a + 1 + y = x * 2 + return fr # ro-ret + + +def walk(): + f = sys._getframe(1) + out = [] + while f is not None and f.f_code.co_name != "": + out.append((f.f_code.co_name, f.f_lineno)) + f = f.f_back + return out + + +def d1(): + return walk() # d1-call + + +def d2(): + r = d1() # d2-call + return r + + +class Getattr: + def __getattr__(self, name): + return sys._getframe(1).f_lineno + + +class Prop: + @property + def line(self): + return sys._getframe(1).f_lineno + + +def escapes(n): + g, p = Getattr(), Prop() + seen = set() + for i in range(n): + seen.add(g.anything) # es-a + z = 0 + seen.add(p.line) # es-b + sorted([2, 1], key=lambda v: seen.add(sys._getframe(1).f_lineno) or v) # es-c + return sorted(seen) + + +def raiser(a): + if a >= 0: + raise ValueError(a) # ra-raise + + +def catches(n): + lines = set() + for i in range(n): + try: + raiser(i) # ca-call + except ValueError as e: + tb = e.__traceback__ + lines.add((tb.tb_lineno, tb.tb_frame.f_lineno)) # ca-add + lines.add((tb.tb_next.tb_lineno, tb.tb_next.tb_frame.f_lineno)) + return sorted(lines) + + +def gen(): + yield 1 # ge-a + x = 2 + yield x # ge-b + + +def gen_lines(n): + seen = set() + for i in range(n): + g = gen() + next(g) + seen.add(g.gi_frame.f_lineno) + next(g) + seen.add(g.gi_frame.f_lineno) + return sorted(seen) + + +import types + +M = types.ModuleType("modx") +exec( + "import sys\n" + "def who(d):\n" + " return sys._getframemodulename(d)\n" + "def via(d):\n" + " return who(d)\n" + "def frame_at(d):\n" + " return sys._getframe(d)\n" + "def chain(d):\n" + " return frame_at(d)\n", + M.__dict__, +) +HERE = __name__ + + +def stack_names(n): + seen = set() + for i in range(n): + seen.add((M.who(0), M.who(1), M.via(1), M.via(2), M.via(10**6))) + f = M.chain(1) + names = [] + while f is not None and f.f_code.co_name != "": + names.append(f.f_code.co_name) + f = f.f_back + seen.add(tuple(names)) + try: + M.chain(10**6) + except ValueError: + seen.add("deep") + return seen + + +def run(n): + want = {("modx", HERE, "modx", HERE, None), ("chain", "stack_names", "run"), "deep"} + got = stack_names(n) + assert got == want, got + assert self_reads(n) == 0 + got = self_getattr(n) + assert got == [L("sg-a"), L("sg-b")], got + seen = set() + for i in range(n): + fr, first, second = held_by_callee_then_read(i) + seen.add((first, second, fr.f_lineno, fr.f_back.f_code.co_name)) + stores_own_frame(i) + seen.add(("F", F.f_lineno)) + seen.add(("R", returns_own_frame(i).f_lineno)) + want = { + (L("hc-a"), L("hc-b"), L("hc-b"), "run"), + ("F", L("so-ret")), + ("R", L("ro-ret")), + } + assert seen == want, seen + for i in range(n // 10): + w = d2() # run-d2 + assert w == [("d1", L("d1-call")), ("d2", L("d2-call")), ("run", L("run-d2"))], w + got = escapes(n) + assert got == [L("es-a"), L("es-b"), L("es-c")], got + got = catches(n // 10) + assert got == [(L("ra-raise"), L("ra-raise")), (L("ca-call"), L("ca-add"))], got + got = gen_lines(n // 10) + assert got == [L("ge-a"), L("ge-b")], got + + +run(10) +run(N) +run(N) diff --git a/tests/regrtest/test_frozen_cache_dont_write_bytecode.py b/tests/regrtest/test_frozen_cache_dont_write_bytecode.py new file mode 100644 index 00000000..cd0eb020 --- /dev/null +++ b/tests/regrtest/test_frozen_cache_dont_write_bytecode.py @@ -0,0 +1,52 @@ +"""The embedded standard library's code cache fills under -B. + +`-B`/`PYTHONDONTWRITEBYTECODE` governs `.pyc` files beside source files; +CPython ships its standard library already compiled. WeavePy's frozen +cache is the counterpart of that installed bytecode, so a process under +`-B` still writes it (otherwise every such process compiled each stdlib +module it imported), while a user module's `.pyc` stays unwritten. +""" + +import os +import subprocess +import sys +import tempfile + + +def cached_names(cache): + names = set() + for root, _dirs, files in os.walk(cache): + names.update(files) + return names + + +def run(cache, cwd, code, dont_write): + env = dict(os.environ) + env['WEAVEPY_FROZEN_CACHE'] = cache + env.pop('PYTHONDONTWRITEBYTECODE', None) + if dont_write: + env['PYTHONDONTWRITEBYTECODE'] = '1' + result = subprocess.run([sys.executable, '-c', code], cwd=cwd, env=env, + capture_output=True, text=True, timeout=120) + assert result.returncode == 0, (result.stdout, result.stderr) + return result.stdout + + +if sys.implementation.name == 'weavepy': + with tempfile.TemporaryDirectory() as directory: + directory = os.path.realpath(directory) + with open(os.path.join(directory, 'frozen_cache_user_mod.py'), 'w') as f: + f.write('VALUE = 7\n') + cache = os.path.join(directory, 'cache') + code = ('import sys, json, frozen_cache_user_mod\n' + 'assert sys.dont_write_bytecode\n' + 'print(json.dumps({"v": frozen_cache_user_mod.VALUE}))\n') + assert run(cache, directory, code, True) == '{"v": 7}\n' + names = cached_names(cache) + assert 'json' in names or 'json.decoder' in names, sorted(names)[:20] + # The user module's bytecode stays unwritten under -B. + assert not os.path.exists(os.path.join(directory, '__pycache__')) + # A second process reads what the first wrote. + assert run(cache, directory, code, True) == '{"v": 7}\n' + +print('frozen cache under -B: ok') diff --git a/tests/regrtest/test_function_attrs_forwarding.py b/tests/regrtest/test_function_attrs_forwarding.py new file mode 100644 index 00000000..70849091 --- /dev/null +++ b/tests/regrtest/test_function_attrs_forwarding.py @@ -0,0 +1,135 @@ +"""Function attributes and `f(*args, **kwargs)` forwarding in hot code. + +Decorators count calls on the wrapper (`wrapper.calls += 1`) and forward +every argument to the wrapped function. Compiled code reads and writes a +function's `__dict__` directly and binds the forwarded mapping without +building the merged copy; these checks keep both exact once the loops are +warm. +""" + +import functools + +N = 3000 + + +def counted(fn): + @functools.wraps(fn) + def wrapper(*args, **kwargs): + wrapper.calls += 1 + return fn(*args, **kwargs) + + wrapper.calls = 0 + return wrapper + + +@counted +def area(w, h=1, *, scale=1.0): + return w * h * scale + + +total = 0.0 +for i in range(N): + total += area(i, h=2, scale=0.5) + total += area(3) +assert area.calls == 2 * N, area.calls +assert total == sum(i * 2 * 0.5 + 3 for i in range(N)), total +assert area.__wrapped__.__name__ == 'area' and area.__name__ == 'area' +assert 'calls' in area.__dict__ and '__wrapped__' in area.__dict__ + + +# A replaced `__dict__` is the one compiled reads and writes see. +def bump(f, n): + for _ in range(n): + f.hits += 1 + return f.hits + + +def target(): + pass + + +target.hits = 0 +assert bump(target, N) == N +fresh = {'hits': 100} +target.__dict__ = fresh +assert bump(target, 5) == 105 and fresh['hits'] == 105 +assert target.__dict__ is fresh + + +# A deleted attribute raises AttributeError from the compiled read. +del target.hits +try: + bump(target, 1) +except AttributeError as e: + assert 'hits' in str(e), e +else: + raise AssertionError('missing function attribute read succeeded') + + +# Dunder names keep the function type's descriptors. +def named(): + pass + + +def rename(f, n): + for k in range(n): + f.__qualname__ = 'q%d' % k + f.__doc__ = 'd%d' % k + return f.__qualname__, f.__doc__, f.__dict__ + + +assert rename(named, N) == ('q%d' % (N - 1), 'd%d' % (N - 1), {}) + + +# Forwarded keywords bind by name, and a callee's own `**kw` is a copy. +def collect(a, b=2, **kw): + kw['seen'] = True + return a, b, kw + + +def forward(*args, **kwargs): + return collect(*args, **kwargs) + + +for i in range(N): + kwargs = {'b': i, 'extra': i + 1} + a, b, kw = forward(i, **kwargs) + assert (a, b, kw) == (i, i, {'extra': i + 1, 'seen': True}) + assert kwargs == {'b': i, 'extra': i + 1} + + +# Errors from the forwarded binding are the callee's. +def strict(x, *, flag=False): + return x, flag + + +def forward_strict(*args, **kwargs): + return strict(*args, **kwargs) + + +for i in range(N): + assert forward_strict(i, flag=True) == (i, True) +for bad, message in ( + (lambda: forward_strict(1, x=2), "got multiple values for argument 'x'"), + (lambda: forward_strict(1, nope=2), "got an unexpected keyword argument 'nope'"), + (lambda: forward_strict(), "missing 1 required positional argument: 'x'"), + (lambda: forward_strict(1, 2), 'takes 1 positional argument but 2 were given'), +): + try: + bad() + except TypeError as e: + assert message in str(e), (message, str(e)) + else: + raise AssertionError(message) + + +# A forwarded call into a builtin and into a class. +def call_through(f, *args, **kwargs): + return f(*args, **kwargs) + + +for i in range(N): + assert call_through(max, i, 3, key=lambda v: -v) == min(i, 3) + assert call_through(dict, a=i) == {'a': i} + +print('function attributes and forwarding: ok') diff --git a/tests/regrtest/test_gc_instance_registry.py b/tests/regrtest/test_gc_instance_registry.py new file mode 100644 index 00000000..9cc0e044 --- /dev/null +++ b/tests/regrtest/test_gc_instance_registry.py @@ -0,0 +1,147 @@ +"""Instances that record their own collector slot: registration, death, and reuse.""" +import gc +import weakref + +previous_enabled = gc.isenabled() +gc.disable() +gc.collect() + + +class Plain: + pass + + +class Node: + def __init__(self, tag): + self.tag = tag + self.other = None + + +finalized = [] + + +class Finalized: + def __init__(self, tag): + self.tag = tag + self.me = self + + def __del__(self): + finalized.append(self.tag) + + +# A plain instance answers as tracked, and keeps answering through churn +# that frees and reuses the slots around it. +keep = Plain() +assert gc.is_tracked(keep) +for _ in range(3): + churn = [Node(i) for i in range(500)] + for node in churn: + node.other = churn + del churn + assert gc.is_tracked(keep) +assert gc.collect() >= 500 +assert any(o is keep for o in gc.get_objects()) + + +# Instances that die by reference count leave the registry at once: a +# collection afterwards finds nothing. +def make_and_drop(n): + for i in range(n): + a = Node(i) + a.other = [a.tag] + del a + + +make_and_drop(1000) +assert gc.collect() == 0 + + +# Self-cycles are reclaimed, counted, and their weakref callbacks run. +callbacks = [] +refs = [] +for i in range(200): + n = Node(i) + n.other = n + refs.append(weakref.ref(n, lambda r: callbacks.append(1))) +del n +collected = gc.collect() +assert collected >= 200, collected +assert all(r() is None for r in refs) +assert len(callbacks) == 200, len(callbacks) + + +# Finalizers run once; a cycle whose __del__ ran is reclaimed by a later +# collection, and the count only covers objects actually reclaimed. +for i in range(50): + Finalized(i) +gc.collect() +assert sorted(finalized) == list(range(50)), finalized +assert gc.collect() == 0 +assert sorted(finalized) == list(range(50)) + + +# Resurrection: a finalizer that stores its object keeps it alive and +# registered, and never runs again. +saved = [] + + +class Phoenix: + def __init__(self): + self.me = self + + def __del__(self): + saved.append(self) + + +Phoenix() +gc.collect() +assert len(saved) == 1 +phoenix = saved.pop() +assert gc.is_tracked(phoenix) +del phoenix +gc.collect() +assert saved == [] + + +# An older instance that dies while a younger cycle is being cleared. +class Holder: + pass + + +old = Holder() +gc.collect() +gc.collect() +young = Node("young") +young.other = young +young.tag = old +del old +del young +assert gc.collect() >= 1 + + +# Frozen instances survive collections and rejoin generation 0 on unfreeze, +# including ones that died while frozen. +frozen_cycle = Node("frozen") +frozen_cycle.other = frozen_cycle +transient = Node("transient") +wr = weakref.ref(frozen_cycle) +gc.freeze() +del transient +del frozen_cycle +gc.collect() +assert wr() is not None +gc.unfreeze() +gc.collect() +assert wr() is None + + +# gc.get_referrers sees an instance holding a list. +target = [] +holder = Node("holder") +holder.other = target +assert any(r is holder or (isinstance(r, dict) and r.get("other") is target) + for r in gc.get_referrers(target)) + +if previous_enabled: + gc.enable() +print("instance registry: ok") diff --git a/tests/regrtest/test_generator_closure_fast_steps.py b/tests/regrtest/test_generator_closure_fast_steps.py new file mode 100644 index 00000000..7f260210 --- /dev/null +++ b/tests/regrtest/test_generator_closure_fast_steps.py @@ -0,0 +1,156 @@ +"""Generator expressions over closures and subscripts once their bodies +are compiled: fast steps run them natively (see `gen_fast` in the VM). + +Each case warms a generator expression until its body compiles, then +checks a behavior at the boundary between the native steps and the +general loop: raises, unbound closure cells, exhausted iterators, and +finalizers of objects an exhausted iterator releases. +""" + +import unittest + +WARM = 3000 + + +class Tracked: + deleted = 0 + + def __del__(self): + Tracked.deleted += 1 + + +def warm(fn, *args): + for _ in range(WARM): + fn(*args) + + +def tuple_of(pool, indices): + return tuple(pool[i] for i in indices) + + +def set_of(vec, cols): + return set(vec[i] + i for i in cols) + + +def sum_of(vec, cols): + return sum(vec[i] * 2 for i in cols) + + +def attr_count(items, k): + return sum(1 for w in items if w.kind is k) + + +class Item: + __slots__ = ("kind",) + + def __init__(self, kind): + self.kind = kind + + +class ClosureFastStepTests(unittest.TestCase): + def test_results(self): + pool = (10, 11, 12, 13) + warm(tuple_of, pool, [3, 2, 1, 0]) + self.assertEqual(tuple_of(pool, [3, 2, 1, 0]), (13, 12, 11, 10)) + self.assertEqual(tuple_of(pool, []), ()) + vec = (3, 1, 0, 2) + warm(set_of, vec, range(4)) + self.assertEqual(set_of(vec, range(4)), {3, 2, 2, 5}) + warm(sum_of, vec, range(4)) + self.assertEqual(sum_of(vec, range(4)), 12) + items = [Item(i % 3) for i in range(10)] + warm(attr_count, items, 1) + self.assertEqual([attr_count(items, k) for k in (0, 1, 2)], [4, 3, 3]) + + def test_raise_after_warm_up(self): + pool = (1, 2, 3) + warm(tuple_of, pool, [0, 1, 2]) + with self.assertRaises(IndexError): + tuple_of(pool, [0, 1, 7]) + gen = (pool[i] for i in [0, 9]) + self.assertEqual(next(gen), 1) + with self.assertRaises(IndexError): + next(gen) + # The generator finished with the raise. + self.assertEqual(list(gen), []) + with self.assertRaises(TypeError): + tuple_of(pool, [0, "x"]) + + def test_unbound_cell(self): + def make(): + v = (1, 2, 3) + gen = (v[i] for i in range(3)) + first = next(gen) + del v + return first, gen + + for _ in range(WARM): + v = (1, 2) + list(v[i] for i in range(2)) + first, gen = make() + self.assertEqual(first, 1) + with self.assertRaises(NameError): + next(gen) + + def test_shared_tuple_iterator(self): + def drain(it): + return list(x + 1 for x in it) + + for _ in range(WARM): + drain(iter((1, 2, 3))) + it = iter((1, 2, 3)) + self.assertEqual(drain(it), [2, 3, 4]) + self.assertEqual(next(it, "end"), "end") + self.assertEqual(list(it), []) + + def test_shared_list_iterator_detaches(self): + def drain(it): + return list(x * 2 for x in it) + + for _ in range(WARM): + drain(iter([1, 2])) + lst = [1, 2, 3] + it = iter(lst) + self.assertEqual(drain(it), [2, 4, 6]) + lst.append(4) + self.assertEqual(next(it, "end"), "end") + # A generator expression's own `.0` over a list that grows later. + lst = [5, 6] + gen = (x for x in lst) + self.assertEqual(list(gen), [5, 6]) + lst.append(7) + self.assertEqual(list(gen), []) + + def test_exhausted_tuple_releases_items(self): + def count(a, b): + return sum(1 for x in (a, b)) + + for _ in range(WARM): + count(1, 2) + Tracked.deleted = 0 + n = count(Tracked(), Tracked()) + # The iterator's tuple held the last references. + self.assertEqual(n, 2) + self.assertEqual(Tracked.deleted, 2) + + def first_only(a, b): + for x in (y for y in (a, b)): + return x + + Tracked.deleted = 0 + for _ in range(WARM): + first_only(1, 2) + first_only(Tracked(), Tracked()) + self.assertEqual(Tracked.deleted, 2) + + def test_nested_closure_generators(self): + def outer(xs, k): + inner = (x * k for x in xs) + return [y + k for y in (v for v in inner)] + + warm(outer, (1, 2, 3), 2) + self.assertEqual(outer((1, 2, 3), 2), [4, 6, 8]) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_generator_direct_resume.py b/tests/regrtest/test_generator_direct_resume.py new file mode 100644 index 00000000..8c7c9b56 --- /dev/null +++ b/tests/regrtest/test_generator_direct_resume.py @@ -0,0 +1,195 @@ +"""Compiled generator bodies resumed straight from compiled consumers: a +`FOR_ITER` or `SEND` in native code runs the generator's native code +itself, and its yield or return comes back to the consumer's native code +(see `run_switched_directly` in the VM's frame JIT). + +Each case warms a consumer and a generator that fast steps don't take +(a call or a handler in the body) until both compile, then checks values, +exhaustion, raises, return values through `yield from` and `await`, +frames seen from inside the generator, finalizers, and recursion limits. +""" + +import sys +import unittest + +WARM = 3000 + + +def double(x): + return x * 2 + + +def calls(n): + for i in range(n): + yield double(i) + + +def guarded(xs): + for x in xs: + try: + yield 10 // x + except ZeroDivisionError: + yield None + + +def consume(gen): + total = 0 + for x in gen: + total += x + return total + + +def inner(n): + for i in range(n): + yield double(i) + return n + + +def outer(n): + got = yield from inner(n) + yield got + + +async def leaf(x): + return double(x) + + +async def node(x): + return await leaf(x) + await leaf(x + 1) + + +def drive(coro): + try: + coro.send(None) + except StopIteration as e: + return e.value + + +class DirectResumeTests(unittest.TestCase): + def test_values_and_exhaustion(self): + for _ in range(WARM): + consume(calls(5)) + self.assertEqual(consume(calls(10)), sum(2 * i for i in range(10))) + self.assertEqual(consume(calls(0)), 0) + self.assertEqual(list(calls(3)), [0, 2, 4]) + + def test_raise_inside(self): + for _ in range(WARM): + list(guarded([1, 2, 0, 5])) + self.assertEqual(list(guarded([1, 0, 2])), [10, None, 5]) + + def bad(n): + for i in range(n): + yield double(i) + raise KeyError("end") + + for _ in range(WARM): + try: + consume(bad(3)) + except KeyError: + pass + with self.assertRaises(KeyError): + consume(bad(3)) + with self.assertRaises(RuntimeError): + # PEP 479: a StopIteration escaping the body. + def stopper(): + yield double(1) + raise StopIteration + + consume(stopper()) + + def test_yield_from_return_value(self): + for _ in range(WARM): + list(outer(3)) + self.assertEqual(list(outer(3)), [0, 2, 4, 3]) + + def test_await_chain(self): + for i in range(WARM): + drive(node(i)) + self.assertEqual(drive(node(5)), 22) + + def test_frames_from_inside(self): + def where(): + for _ in range(2): + f = sys._getframe() + yield (f.f_code.co_name, f.f_back.f_code.co_name if f.f_back else None) + + def run(): + out = [] + for item in where(): + out.append(item) + return out + + for _ in range(WARM): + run() + self.assertEqual(run(), [("where", "run"), ("where", "run")]) + + def test_finalizer_on_exhaustion(self): + log = [] + + class Tracked: + def __del__(self): + log.append("del") + + def holder(): + t = Tracked() + yield double(1) + del t + log.append("after") + yield double(2) + + for _ in range(WARM): + consume(holder()) + log.clear() + for x in holder(): + log.append(x) + self.assertEqual(log, [2, "del", "after", 4]) + + def test_recursion_limit(self): + def nest(n): + if n: + yield from nest(n - 1) + yield double(n) + + for _ in range(200): + consume(nest(20)) + limit = sys.getrecursionlimit() + try: + sys.setrecursionlimit(200) + with self.assertRaises(RecursionError): + consume(nest(400)) + finally: + sys.setrecursionlimit(limit) + self.assertEqual(consume(nest(50)), sum(2 * i for i in range(51))) + + def test_close_and_throw_midway(self): + def counting(): + try: + for i in range(10): + yield double(i) + finally: + log.append("closed") + + log = [] + for _ in range(WARM): + g = counting() + for x in g: + if x > 4: + break + g.close() + log.clear() + g = counting() + for x in g: + if x > 4: + break + g.close() + self.assertEqual(log, ["closed"]) + g = counting() + next(g) + with self.assertRaises(ValueError): + g.throw(ValueError) + self.assertEqual(log, ["closed", "closed"]) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_generator_instance_iter_chains.py b/tests/regrtest/test_generator_instance_iter_chains.py new file mode 100644 index 00000000..28bc897a --- /dev/null +++ b/tests/regrtest/test_generator_instance_iter_chains.py @@ -0,0 +1,166 @@ +"""Generators made by `iter(obj)` / `await obj` from a generator +`__iter__` / `__await__`, and recursive `yield from` chains. + +`iter(obj)` builds the generator of a generator-function `__iter__` +without the call machinery; the receiver goes straight into the frame, +defaults fill any later parameters, and a body with cells of its own +takes the general frame. Resuming a suspended chain of `yield from`s +resumes its innermost generator directly; levels that share code and a +resume point are walked from what the previous level showed. Values, +`send`, `throw`, `close`, `gi_yieldfrom` and `gi_running` must come out +as CPython's. +""" + +import sys + + +class Tree: + __slots__ = ("left", "value", "right") + + def __init__(self, left, value, right): + self.left = left + self.value = value + self.right = right + + def __iter__(self): + if self.left: + yield from self.left + yield self.value + if self.right: + yield from self.right + + +def build(lo, hi): + if lo >= hi: + return None + mid = (lo + hi) // 2 + return Tree(build(lo, mid), mid, build(mid + 1, hi)) + + +tree = build(0, 200) +for _ in range(30): + assert list(tree) == list(range(200)) + assert sum(tree) == sum(range(200)) + assert max(x for x in tree if x % 7 == 3) == 199 - (199 - 3) % 7 + + +# Defaults after `self`, and a body with a cell of its own. +class WithDefault: + def __iter__(self, step=2, start=1): + yield from range(start, 7, step) + + +class WithCell: + def __init__(self, n): + self.n = n + + def __iter__(self): + n = self.n + + def bump(x): + return x + n + + for i in range(3): + yield bump(i) + + +for _ in range(50): + assert list(WithDefault()) == [1, 3, 5] + assert list(WithCell(10)) == [10, 11, 12] + + +# `__await__` as a generator function. +class Ready: + def __init__(self, v): + self.v = v + + def __await__(self): + yield None + return self.v + + +async def use(n): + total = 0 + for i in range(n): + total += await Ready(i) + return total + + +def drive(c): + try: + while True: + c.send(None) + except StopIteration as e: + return e.value + + +for _ in range(20): + assert drive(use(50)) == sum(range(50)) + + +# A deep chain: send and throw reach the innermost level; the levels in +# between report the delegation as CPython does. +def leaf(log): + while True: + try: + got = yield "leaf" + log.append(got) + except KeyError as e: + log.append(("caught", e.args[0])) + yield "after-throw" + + +def level(n, log): + if n == 0: + r = yield from leaf(log) + else: + r = yield from level(n - 1, log) + return r + + +for depth in (1, 2, 5, 12): + log = [] + g = level(depth, log) + assert next(g) == "leaf" + for i in range(20): + assert g.send(i) == "leaf" + assert log == list(range(20)), log + # Walk the chain: every level but the innermost delegates. + inner, levels = g, 0 + while inner.gi_yieldfrom is not None: + assert not inner.gi_running + inner = inner.gi_yieldfrom + levels += 1 + assert levels == depth + 1, (levels, depth) + assert inner.gi_code.co_name == "leaf" + assert g.throw(KeyError("k")) == "after-throw" + assert log[-1] == ("caught", "k") + assert next(g) == "leaf" + g.close() + assert g.gi_frame is None + + +# A level touched from inside the innermost one is running. +def outer_check(): + me = yield + yield from inner_check(me) + + +def inner_check(top): + assert top.gi_running + try: + next(top) + except ValueError as e: + assert "already executing" in str(e) + else: + raise AssertionError("re-entered a running generator") + yield "ok" + + +for _ in range(10): + g = outer_check() + next(g) + assert g.send(g) == "ok" + g.close() + +print("ok") diff --git a/tests/regrtest/test_generator_name_snapshot.py b/tests/regrtest/test_generator_name_snapshot.py new file mode 100644 index 00000000..6747dffc --- /dev/null +++ b/tests/regrtest/test_generator_name_snapshot.py @@ -0,0 +1,99 @@ +"""A generator snapshots its function's `__name__` and `__qualname__` at +creation. A function whose getset slots were read (as `functools.wraps` +reads them) remembers the slots' state in which it last found its code's +own names there, so later generators skip the comparison (see +`PyFunction::code_names_kept` in the VM). Each case makes generators warm, +then renames or swaps the code, and checks what new generators report. +""" + +import functools +import unittest + +WARM = 2000 + + +def plain(): + yield 1 + + +def other(): + yield 2 + + +class GeneratorNameSnapshotTests(unittest.TestCase): + def make(self): + def gen(x): + yield x + + # Reading the slots the way `wraps` does materializes them. + @functools.wraps(gen) + def wrapper(*a): + return gen(*a) + + return gen, wrapper + + def test_wrapped_names_warm(self): + gen, wrapper = self.make() + for i in range(WARM): + g = wrapper(i) + self.assertEqual(g.__name__, "gen") + self.assertTrue(g.__qualname__.endswith("make..gen")) + self.assertIs(g.__name__, gen.__name__) + self.assertIs(g.__qualname__, gen.__qualname__) + + def test_rename_after_warm(self): + gen, wrapper = self.make() + for i in range(WARM): + wrapper(i) + gen.__name__ = "renamed" + g = wrapper(0) + self.assertEqual(g.__name__, "renamed") + self.assertIs(g.__name__, gen.__name__) + gen.__qualname__ = "Q.renamed" + g = wrapper(0) + self.assertEqual(g.__qualname__, "Q.renamed") + for i in range(WARM): + g = wrapper(i) + self.assertEqual((g.__name__, g.__qualname__), ("renamed", "Q.renamed")) + + def test_rename_back_to_equal_text(self): + gen, wrapper = self.make() + for i in range(WARM): + wrapper(i) + text = "".join(["g", "en"]) + gen.__name__ = text + g = wrapper(0) + self.assertEqual(g.__name__, "gen") + self.assertIs(g.__name__, gen.__name__) + + def test_code_swap(self): + def f(): + yield 1 + + functools.update_wrapper(lambda: None, f) + for _ in range(WARM): + g = f() + self.assertEqual(g.__name__, "f") + f.__code__ = other.__code__ + g = f() + self.assertEqual(next(g), 2) + self.assertEqual(g.__name__, f.__name__) + self.assertEqual(g.__qualname__, f.__qualname__) + + def test_unread_slots(self): + for _ in range(WARM): + g = plain() + self.assertEqual(g.__name__, "plain") + self.assertEqual(g.__qualname__, "plain") + + def test_generator_name_reassigned(self): + gen, wrapper = self.make() + for i in range(WARM): + g = wrapper(i) + g.__name__ = "mine" + self.assertEqual(g.__name__, "mine") + self.assertEqual(wrapper(1).__name__, "gen") + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_generator_next_fast_steps.py b/tests/regrtest/test_generator_next_fast_steps.py new file mode 100644 index 00000000..f64354da --- /dev/null +++ b/tests/regrtest/test_generator_next_fast_steps.py @@ -0,0 +1,154 @@ +"""`next()` and native consumers stepping simple generators in place. + +A simple generator body may run to its next yield without an activation +of its own, whether the consumer is a `FOR_ITER`, a `next()` call from +compiled or interpreted code, or a native consumer (`enumerate`, `zip`, +`map`, `iter` with a sentinel). Values, exhaustion (`StopIteration` and +its value, a default), the generator's state and the release of what it +yields must not depend on which consumer stepped it. +""" + +import inspect +import unittest + +ROUNDS = 300 + + +def counting(n): + for i in range(n): + yield i + return n * 10 + + +class Noted: + log = [] + + def __init__(self, i): + self.i = i + + def __del__(self): + Noted.log.append(self.i) + + +def noted(n): + for i in range(n): + yield Noted(i) + + +class NextFastStepsTest(unittest.TestCase): + def test_next_until_exhausted(self): + def drain(g): + out = [] + while True: + try: + out.append(next(g)) + except StopIteration as e: + return out, e.value + + for _ in range(ROUNDS): + out, value = drain(counting(5)) + self.assertEqual(out, [0, 1, 2, 3, 4]) + self.assertEqual(value, 50) + + def test_next_with_default(self): + marker = object() + + def drain(g): + out = [] + while (x := next(g, marker)) is not marker: + out.append(x) + return out + + for _ in range(ROUNDS): + g = counting(4) + self.assertEqual(drain(g), [0, 1, 2, 3]) + self.assertIs(next(g, marker), marker) + self.assertEqual(inspect.getgeneratorstate(g), inspect.GEN_CLOSED) + + def test_next_state_between_items(self): + def step(g, n): + for _ in range(n): + next(g) + + for _ in range(ROUNDS): + g = counting(10) + self.assertEqual(inspect.getgeneratorstate(g), inspect.GEN_CREATED) + step(g, 3) + self.assertEqual(inspect.getgeneratorstate(g), inspect.GEN_SUSPENDED) + self.assertEqual(g.gi_frame.f_locals["i"], 2) + self.assertEqual(next(g), 3) + self.assertEqual(list(g), [4, 5, 6, 7, 8, 9]) + + def test_release_of_yielded_values(self): + def take(g, n): + for _ in range(n): + x = next(g) + del x + + for _ in range(ROUNDS // 10): + Noted.log = [] + g = noted(5) + take(g, 3) + self.assertEqual(Noted.log, [0, 1, 2]) + del g + self.assertEqual(Noted.log, [0, 1, 2]) + + def test_release_of_the_default(self): + def last(g, default): + x = next(g, default) + return x + + for _ in range(ROUNDS // 10): + Noted.log = [] + g = counting(0) + self.assertIsInstance(last(g, Noted(-1)), Noted) + self.assertEqual(Noted.log, [-1]) + + def test_native_consumers(self): + for _ in range(ROUNDS): + self.assertEqual(list(enumerate(counting(3))), [(0, 0), (1, 1), (2, 2)]) + self.assertEqual(list(zip(counting(3), counting(4))), [(0, 0), (1, 1), (2, 2)]) + self.assertEqual(list(map(next, [counting(2)] * 2)), [0, 1]) + g = counting(3) + self.assertEqual(list(map(next, [g, g, g])), [0, 1, 2]) + self.assertEqual(list(iter(counting(9).__next__, 4)), [0, 1, 2, 3]) + + def test_native_consumer_exhaustion_value(self): + for _ in range(ROUNDS): + g = counting(2) + self.assertEqual(list(enumerate(g)), [(0, 0), (1, 1)]) + with self.assertRaises(StopIteration) as cm: + g.__next__() + self.assertIsNone(cm.exception.value) + g = counting(1) + self.assertEqual(g.__next__(), 0) + with self.assertRaises(StopIteration) as cm: + g.__next__() + self.assertEqual(cm.exception.value, 10) + + def test_running_inside(self): + seen = [] + + def peeking(): + for i in range(3): + seen.append(me.gi_running) + yield i + + for _ in range(ROUNDS // 10): + seen.clear() + me = peeking() + self.assertEqual([next(me), next(me), next(me)], [0, 1, 2]) + self.assertEqual(seen, [True, True, True]) + + def test_reentrant_next_raises(self): + def selfish(): + yield next(me) + + for _ in range(ROUNDS // 10): + me = selfish() + with self.assertRaisesRegex(ValueError, "already executing"): + next(me) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_generator_send_method.py b/tests/regrtest/test_generator_send_method.py new file mode 100644 index 00000000..7f8c3d4c --- /dev/null +++ b/tests/regrtest/test_generator_send_method.py @@ -0,0 +1,142 @@ +"""`gen.send(v)` and `coro.send(v)` as method calls: the method load +pushes the unbound `send` with the generator as its self, and the `CALL` +resumes the generator inline (see `core_gen_method` in the VM). + +Each case runs warm (in loops long enough to compile) and checks the +general path's behaviors too: arity errors, sends into fresh, running +and finished generators, frames made visible, and the bound and unbound +forms of the method. +""" + +import unittest + +WARM = 3000 + + +def averager(): + total = 0.0 + count = 0 + avg = None + while True: + value = yield avg + total += value + count += 1 + avg = total / count + + +def echo(): + value = None + while True: + value = yield value + + +class SendMethodTests(unittest.TestCase): + def test_warm_sends(self): + avg = averager() + next(avg) + last = None + for i in range(WARM): + last = avg.send(i) + self.assertEqual(last, (WARM - 1) / 2) + + def test_arity(self): + g = echo() + next(g) + for _ in range(WARM): + g.send(1) + with self.assertRaises(TypeError): + g.send() + with self.assertRaises(TypeError): + g.send(1, 2) + self.assertEqual(g.send(3), 3) + + def test_fresh_running_finished(self): + for _ in range(WARM): + g = echo() + g.send(None) + g = echo() + with self.assertRaises(TypeError): + g.send(1) + self.assertIsNone(g.send(None)) + + def selfsend(): + yield me.send(None) + + me = selfsend() + with self.assertRaises(ValueError): + next(me) + + def short(): + yield 1 + + g = short() + g.send(None) + with self.assertRaises(StopIteration): + g.send(None) + with self.assertRaises(StopIteration): + g.send(None) + + def test_visible_frame(self): + g = echo() + next(g) + for i in range(WARM): + self.assertEqual(g.send(i), i) + self.assertEqual(g.gi_frame.f_locals["value"], WARM - 1) + for i in range(10): + self.assertEqual(g.send(i), i) + self.assertFalse(g.gi_running) + + def test_bound_and_unbound_forms(self): + g = echo() + next(g) + send = g.send + for i in range(WARM): + self.assertEqual(send(i), i) + self.assertEqual(type(g).send(g, 7), 7) + self.assertEqual(getattr(g, "send")(8), 8) + with self.assertRaises(TypeError): + type(g).send(1, 2) + + def test_coroutine_send(self): + class Suspend: + def __await__(self): + return (yield "s") + + async def coro(): + total = 0 + while True: + total += await Suspend() + if total > 10 ** 9: + return total + + c = coro() + self.assertEqual(c.send(None), "s") + for i in range(WARM): + self.assertEqual(c.send(i), "s") + with self.assertRaises(StopIteration) as cm: + c.send(10 ** 10) + self.assertEqual(cm.exception.value, sum(range(WARM)) + 10 ** 10) + c2 = coro() + with self.assertRaises(TypeError): + c2.send(1) + c2.close() + + def test_exception_from_send(self): + def raiser(): + while True: + v = yield + if v < 0: + raise KeyError(v) + + g = raiser() + next(g) + for i in range(WARM): + g.send(i) + with self.assertRaises(KeyError): + g.send(-1) + with self.assertRaises(StopIteration): + g.send(1) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_genexpr_exhaustion.py b/tests/regrtest/test_genexpr_exhaustion.py new file mode 100644 index 00000000..20d44111 --- /dev/null +++ b/tests/regrtest/test_genexpr_exhaustion.py @@ -0,0 +1,56 @@ +"""Generator expressions run to exhaustion by compiled code, whose `.0` +iterator the loop shares with the generator's local: ranges, strings, +bytes, lists (of plain scalars, and of objects whose finalizers must run +when the generator lets go of them), sets, and tuples. Each runs enough +times for the compiled body to take it.""" +import gc + +ROUNDS = 500 + +log = [] + + +class Fin: + def __init__(self, i): + self.i = i + + def __del__(self): + log.append(self.i) + + +def build(xs): + return tuple(x for x in xs) + + +for r in range(ROUNDS): + n = r % 7 + assert build(range(n)) == tuple(range(n)) + assert build("abc"[: n % 4]) == tuple("abc"[: n % 4]) + assert build(b"xyz"[: n % 4]) == tuple(b"xyz"[: n % 4]) + assert build([1, 2.5, None, "s", True][:n]) == (1, 2.5, None, "s", True)[:n] + assert sorted(build({1, 2, 3, n})) == sorted({1, 2, 3, n}) + assert build((n, n + 1)) == (n, n + 1) + assert set(c for c in "hello") == {"h", "e", "l", "o"} + assert sum(i for i in range(n)) == n * (n - 1) // 2 + assert all(c.isalpha() for c in "abc") + assert not any(i < 0 for i in range(n)) + + # The objects of a temporary list a generator expression walked die + # as the finished generator lets go of the list's iterator. + log.clear() + g = (f.i for f in [Fin(1), Fin(2)]) + assert list(g) == [1, 2] + assert sorted(log) == [1, 2], log + del g + + # A set shrinking mid-walk still raises. + s = {1, 2, 3} + try: + for v in (x for x in s): + s.discard(3) + s.discard(2) + except RuntimeError: + pass + else: + raise AssertionError("set size change not detected") +print("genexpr exhaustion ok") diff --git a/tests/regrtest/test_globals_missing_prune.py b/tests/regrtest/test_globals_missing_prune.py new file mode 100644 index 00000000..4f76cc68 --- /dev/null +++ b/tests/regrtest/test_globals_missing_prune.py @@ -0,0 +1,68 @@ +"""A dict subclass's `__missing__` serves global-name misses for code run +under it as globals, for as long as that code can run. + +Builtin lookups skip the check once no such globals are left (the +owners are pruned when nothing can reach them), so a function made +under them must keep them alive, and a later one must register again. +""" + +import gc + + +class Fallback(dict): + def __missing__(self, key): + if key == "magic": + return 42 + if key == "len": + # Shadows the builtin: a miss asks the mapping first. + return lambda x: 100 + raise KeyError(key) + + +def make(ns): + exec("def f():\n return magic + len('ab')\n", ns) + return ns["f"] + + +f = make(Fallback()) +assert f() == 142 + +# Unrelated builtin-heavy code in between, and collections, which prune +# the owners nothing reaches. +for _ in range(3): + gc.collect() + total = 0 + for i in range(2000): + total += abs(-i) + len("xy") + assert total == sum(range(2000)) + 4000 + +# `f` still holds its globals: the misses still go to `__missing__`, in +# whatever tier runs it once it's hot. +for _ in range(5000): + assert f() == 142 + +# Drop it; a fresh subclass-globals run registers again. +del f +gc.collect() +g = make(Fallback()) +for _ in range(5000): + assert g() == 142 + +# eval with a subclass mapping as globals. +assert eval("magic * 2", Fallback()) == 84 + +# A dataclass whose annotations name an undefined type (annotationlib's +# fake globals) leaves builtin lookups working afterwards. +from dataclasses import dataclass + + +@dataclass +class P: + x: "Undefined" # noqa: F821 + y: int = 0 + + +assert P(1).x == 1 +gc.collect() +assert len([1, 2, 3]) == 3 and abs(-5) == 5 +print("ok") diff --git a/tests/regrtest/test_hasattr_builtin_value_misses.py b/tests/regrtest/test_hasattr_builtin_value_misses.py new file mode 100644 index 00000000..9affa6af --- /dev/null +++ b/tests/regrtest/test_hasattr_builtin_value_misses.py @@ -0,0 +1,62 @@ +"""`hasattr` and `getattr` with a default on values of built-in types +answer repeated misses the same as the first, without confusing a value +with its type, a subclass instance, or a hit.""" + +values = [None, True, 1, 1.5, "s", b"b", (1,), [1], {1: 2}, {1}, frozenset({1})] +for _ in range(200): + for v in values: + assert not hasattr(v, "__get__") + assert not hasattr(v, "no_such_attribute") + assert getattr(v, "__set__", "dflt") == "dflt" + assert hasattr(v, "__class__") + assert hasattr(v, "__eq__") + assert getattr(v, "__class__", None) is type(v) + +for _ in range(200): + assert hasattr(1, "real") and getattr(1, "imag", None) == 0 + assert hasattr([], "append") and getattr({}, "get", None) is not None + assert hasattr("x", "join") and not hasattr("x", "append") + assert hasattr((), "count") and not hasattr((), "append") + +# A miss on a value is not a miss on its type, nor on a subclass's +# instances. +assert not hasattr(1, "mro") +assert hasattr(int, "mro") + + +class MyInt(int): + pass + + +class Lazy(list): + def __getattr__(self, name): + return "lazy:" + name + + +m = MyInt(3) +m.no_such_attribute = "set" +lz = Lazy() +for _ in range(200): + assert not hasattr(3, "no_such_attribute") + assert getattr(m, "no_such_attribute") == "set" + assert hasattr(m, "no_such_attribute") + assert hasattr(lz, "no_such_attribute") + assert getattr(lz, "__get__", None) == "lazy:__get__" + assert getattr([], "__get__", None) is None + +# Errors other than AttributeError still propagate, and a missing +# attribute without a default still raises with CPython's message. +try: + getattr(1, "nope") +except AttributeError as e: + assert str(e) == "'int' object has no attribute 'nope'", str(e) +else: + raise AssertionError("expected AttributeError") +try: + hasattr(1, 2) +except TypeError as e: + assert "attribute name must be string" in str(e), str(e) +else: + raise AssertionError("expected TypeError") + +print("ok") diff --git a/tests/regrtest/test_instance_dict_materialize.py b/tests/regrtest/test_instance_dict_materialize.py new file mode 100644 index 00000000..725d9f8c --- /dev/null +++ b/tests/regrtest/test_instance_dict_materialize.py @@ -0,0 +1,66 @@ +"""An instance's split attributes becoming its real `__dict__`. + +The dictionary is built in one pass from the split values: its order, +lookups (small and large tables), later stores, deletes and identity +must be exactly a dictionary's. +""" + +import unittest + + +def make(n, tag=0): + class C: + pass + + objs = [] + for k in range(3): + o = C() + for i in range(n): + setattr(o, "a%d" % i, (tag, k, i)) + objs.append(o) + return objs + + +class MaterializeTest(unittest.TestCase): + def check(self, n): + for o in make(n, n): + d = o.__dict__ + self.assertIs(o.__dict__, d) + names = ["a%d" % i for i in range(n)] + self.assertEqual(list(d), names) + for i, name in enumerate(names): + self.assertEqual(d[name][2], i) + self.assertIn(name, d) + self.assertNotIn("missing", d) + o.extra = 1 + self.assertEqual(d["extra"], 1) + if n: + del o.a0 + self.assertNotIn("a0", d) + d["a0"] = "back" + self.assertEqual(o.a0, "back") + self.assertEqual(list(d)[-1], "a0") + self.assertEqual(len(d), n + 1) + self.assertEqual("%(extra)s" % d, "1") + + def test_sizes(self): + for n in (0, 1, 7, 8, 9, 15, 16, 17, 29, 30, 31, 40): + self.check(n) + + def test_vars_and_hash_collisions(self): + class K: + pass + + k = K() + # Names whose hashes share low bits still land and resolve. + names = ["x%d" % i for i in range(64)] + for n in names: + setattr(k, n, n) + v = vars(k) + self.assertEqual(sorted(v), sorted(names)) + for n in names: + self.assertEqual(v[n], n) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_introspection_lanes.py b/tests/regrtest/test_introspection_lanes.py new file mode 100644 index 00000000..06dd3cb2 --- /dev/null +++ b/tests/regrtest/test_introspection_lanes.py @@ -0,0 +1,74 @@ +"""Operations `inspect` leans on, at warm sites: membership in and +subscripts of a class's `__dict__` view, `sys.getrecursionlimit()`, and constructing `weakref.ref` +and `types.MappingProxyType` objects.""" + +import sys +import types +import weakref + + +class A: + x = 1 + + +for i in range(300): + assert "x" in A.__dict__ + assert "missing" not in A.__dict__ + assert ("x" not in A.__dict__) is False + assert "__dict__" in A.__dict__ + assert "__mro__" in type.__dict__ +for i in range(300): + assert A.__dict__["x"] == 1 + assert type.__dict__["__mro__"].__get__(A) == (A, object) + try: + A.__dict__["missing"] + except KeyError as e: + assert e.args == ("missing",) + else: + raise AssertionError("expected KeyError") +A.y = 2 +assert "y" in A.__dict__ and A.__dict__["y"] == 2 +del A.y +assert "y" not in A.__dict__ + +old = sys.getrecursionlimit() +try: + for limit in (old, old + 50, old + 100): + sys.setrecursionlimit(limit) + for _ in range(100): + assert sys.getrecursionlimit() == limit +finally: + sys.setrecursionlimit(old) + + +class Target: + pass + + +for _ in range(300): + t = Target() + r = weakref.ref(t) + assert r() is t + del t + assert r() is None + +for i in range(300): + d = {"k": i} + proxy = types.MappingProxyType(d) + assert proxy["k"] == i and len(proxy) == 1 + d["k2"] = 0 + assert "k2" in proxy +try: + types.MappingProxyType(1) +except TypeError as e: + assert "mappingproxy() argument must be a mapping" in str(e), str(e) +else: + raise AssertionError("expected TypeError") +try: + weakref.ref(1) +except TypeError as e: + assert "cannot create weak reference to 'int' object" in str(e), str(e) +else: + raise AssertionError("expected TypeError") + +print("ok") diff --git a/tests/regrtest/test_isinstance_class_attr_miss.py b/tests/regrtest/test_isinstance_class_attr_miss.py new file mode 100644 index 00000000..fe9082f6 --- /dev/null +++ b/tests/regrtest/test_isinstance_class_attr_miss.py @@ -0,0 +1,129 @@ +"""`isinstance` misses on instances skip the `__class__` read only when +nothing can answer it differently. + +An instance whose class overrides neither `__class__` nor +`__getattribute__` is an instance of exactly its MRO. A `__class__` +property, a `__getattribute__` that reports another class, and +a `__getattribute__` installed on a base after warm-up must still be consulted. +""" + +import unittest + + +class Plain: + pass + + +class Liar: + @property + def __class__(self): + return str + + +class Sneaky: + def __getattribute__(self, name): + if name == "__class__": + return int + return object.__getattribute__(self, name) + + +class IsinstanceClassAttrTest(unittest.TestCase): + def test_plain_miss(self): + p = Plain() + for _ in range(2000): + self.assertFalse(isinstance(p, str)) + self.assertFalse(isinstance(p, (int, str))) + self.assertTrue(isinstance(p, Plain)) + + def test_property_and_getattribute(self): + for _ in range(2000): + self.assertTrue(isinstance(Liar(), str)) + self.assertTrue(isinstance(Sneaky(), int)) + self.assertFalse(isinstance(Sneaky(), str)) + + def test_installed_after_warmup(self): + class Base: + pass + + class Child(Base): + pass + + c = Child() + for _ in range(2000): + self.assertFalse(isinstance(c, bytes)) + + def getattribute(self, name): + if name == "__class__": + return float + return object.__getattribute__(self, name) + + Base.__getattribute__ = getattribute + for _ in range(2000): + self.assertTrue(isinstance(c, float)) + del Base.__getattribute__ + for _ in range(2000): + self.assertFalse(isinstance(c, float)) + + def test_structural_pathlike(self): + import os + + class Fake: + def __fspath__(self): + return b"/" + + f = Fake() + for _ in range(2000): + self.assertTrue(isinstance(f, os.PathLike)) + self.assertFalse(isinstance(Plain(), os.PathLike)) + + def test_class_assignment(self): + class A: + pass + + class B: + pass + + a = A() + for _ in range(500): + self.assertFalse(isinstance(a, B)) + a.__class__ = B + self.assertTrue(isinstance(a, B)) + self.assertFalse(isinstance(a, A)) + + +class FloatRatioAndCodecTest(unittest.TestCase): + def test_as_integer_ratio(self): + from fractions import Fraction + import math + values = [0.0, -0.0, 1.0, -1.0, 0.5, 12.3, -99.9, 1e-300, 5e-324, + 2.0 ** 62, 2.0 ** 63, 2.0 ** 64, 1e300, 3.141592653589793, + 2.0 ** -62, 2.0 ** -63, 1.5 * 2.0 ** -62, 1.0 / 3, 1e16 + 2] + for v in values: + n, d = v.as_integer_ratio() + self.assertIs(type(n), int) + self.assertIs(type(d), int) + self.assertGreater(d, 0) + self.assertEqual(math.gcd(n, d), 1 if n else d) + self.assertEqual(Fraction(n, d), Fraction(v)) + self.assertEqual((-0.0).as_integer_ratio(), (0, 1)) + self.assertEqual((0.25).as_integer_ratio(), (1, 4)) + + def test_encode_decode_with_errors(self): + for _ in range(500): + self.assertEqual("abc".encode("utf-8", "strict"), b"abc") + self.assertEqual("\xe9".encode("latin-1", "strict"), b"\xe9") + self.assertEqual("\xe9".encode("ascii", "replace"), b"?") + self.assertEqual("\xe9".encode("ascii", "ignore"), b"") + self.assertEqual(b"abc".decode("utf-8", "strict"), "abc") + self.assertEqual(b"\xff".decode("utf-8", "replace"), "�") + self.assertEqual(b"\xff".decode("ascii", "surrogateescape"), "\udcff") + with self.assertRaises(UnicodeEncodeError): + "\xe9".encode("ascii", "strict") + with self.assertRaises(UnicodeDecodeError): + b"\xff".decode("utf-8", "strict") + with self.assertRaises(LookupError): + "\xe9".encode("ascii", "no-such-handler") + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_kw_binding_names.py b/tests/regrtest/test_kw_binding_names.py new file mode 100644 index 00000000..1cb92d96 --- /dev/null +++ b/tests/regrtest/test_kw_binding_names.py @@ -0,0 +1,108 @@ +"""Keyword calls bound from the call site's names: callees with closures +(cells), bound methods, `**kwargs` and `*args`, `f(*a, **d)`, keywords out +of parameter order, defaults, and every binding error, each run enough +times to take the interpreter's warmed call paths.""" + +ROUNDS = 200 + + +def make(): + secret = 7 + + def cl(a, b=2, c=3, *, d=4, e=5): + def inner(): + return secret + a + return (a, b, c, d, e, inner()) + + def cl_star(a, *rest, k=1, **kw): + def inner(): + return secret + return (a, rest, k, sorted(kw.items()), inner()) + + def cl_posonly(a, b, /, c=0, **kw): + def inner(): + return secret + return (a, b, c, sorted(kw.items()), inner()) + + return cl, cl_star, cl_posonly + + +cl, cl_star, cl_posonly = make() + + +class K: + def __init__(self): + self.tag = "k" + + def m(self, x, y=10, *, z=20): + def inner(): + return self.tag + return (x, y, z, inner()) + + +def expect_error(fn, msg): + try: + fn() + except TypeError as e: + assert msg in str(e), (msg, str(e)) + else: + raise AssertionError("no TypeError: " + msg) + + +k = K() +for _ in range(ROUNDS): + assert cl(1, b=2) == (1, 2, 3, 4, 5, 8) + assert cl(1, c=30, b=20) == (1, 20, 30, 4, 5, 8) + assert cl(a=1) == (1, 2, 3, 4, 5, 8) + assert cl(1, e=50, d=40) == (1, 2, 3, 40, 50, 8) + assert cl(1, 2, 3, d=0) == (1, 2, 3, 0, 5, 8) + assert cl(*(1, 2), **{"e": 9}) == (1, 2, 3, 4, 9, 8) + assert cl_star(1, 2, 3, k=4, x=5, y=6) == (1, (2, 3), 4, [("x", 5), ("y", 6)], 7) + assert cl_star(1, x=5) == (1, (), 1, [("x", 5)], 7) + assert cl_star(a=1, k=2) == (1, (), 2, [], 7) + assert cl_star(*[1, 2], **{"q": 3}) == (1, (2,), 1, [("q", 3)], 7) + # A positional-only name given as a keyword lands in `**kw`. + assert cl_posonly(1, 2, a=3, c=4) == (1, 2, 4, [("a", 3)], 7) + assert k.m(1, z=3) == (1, 10, 3, "k") + assert k.m(x=1, y=2) == (1, 2, 20, "k") + m = k.m + assert m(1, y=5) == (1, 5, 20, "k") + # The `**kwargs` dictionary keeps the call's keys and order. + r = cl_star(0, b=1, a2=2, c=3) + assert r[3] == [("a2", 2), ("b", 1), ("c", 3)] + + expect_error(lambda: cl(1, a=2), "got multiple values for argument 'a'") + expect_error(lambda: cl(1, f=2), "got an unexpected keyword argument 'f'") + expect_error(lambda: cl(b=2), "missing 1 required positional argument: 'a'") + expect_error(lambda: cl(1, 2, 3, 4, d=1), "takes from 1 to 3 positional arguments but 4 positional arguments (and 1 keyword-only argument) were given") + expect_error(lambda: cl_posonly(1, c=2), "missing 1 required positional argument: 'b'") + expect_error(lambda: k.m(1, x=2), "got multiple values for argument 'x'") + expect_error(lambda: k.m(y=2), "missing 1 required positional argument: 'x'") + expect_error(lambda: cl(**{"a": 1, "zz": 2}), "got an unexpected keyword argument 'zz'") + + +def posonly_only(a, /, b): + def inner(): + return a + return inner() + b + + +for _ in range(ROUNDS): + assert posonly_only(1, b=2) == 3 + expect_error(lambda: posonly_only(a=1, b=2), "positional-only arguments passed as keyword arguments: 'a'") + + +# Replaced defaults are honored. +def with_defaults(a, b=1, *, c=2): + def inner(): + return a + return (inner(), b, c) + + +for i in range(ROUNDS): + if i == ROUNDS // 2: + with_defaults.__defaults__ = (100,) + with_defaults.__kwdefaults__ = {"c": 200} + want = (5, 1, 2) if i < ROUNDS // 2 else (5, 100, 200) + assert with_defaults(a=5) == want, (i, with_defaults(a=5)) +print("kw binding names ok") diff --git a/tests/regrtest/test_kw_binding_slot_limit.py b/tests/regrtest/test_kw_binding_slot_limit.py new file mode 100644 index 00000000..745ac939 --- /dev/null +++ b/tests/regrtest/test_kw_binding_slot_limit.py @@ -0,0 +1,60 @@ +"""Keyword arguments bind to every parameter slot of wide signatures. + +The keyword-call permutation packs each keyword's parameter slot into a +4-bit nibble whose value 15 means "into `**kwargs`"; a callee with 16 +parameter slots once lost a keyword aimed at slot 15 +(`dataclasses.make_dataclass(..., decorator=...)` raised +UnboundLocalError). Exercised at module level, in a loop, and in a hot +function, at signature widths around the limit. +""" + +import dataclasses + + +def make(npos, nkw, varkw=False): + pos = [f"a{i}" for i in range(npos)] + kws = [f"k{i}=None" for i in range(nkw)] + params = pos + (["*"] + kws if kws else []) + if varkw: + params.append("**rest") + names = [f"a{i}" for i in range(npos)] + [f"k{i}" for i in range(nkw)] + items = [f"{n!r}: {n}" for n in names] + (["'rest': rest"] if varkw else []) + ns = {} + exec(f"def f({', '.join(params)}):\n return {{{', '.join(items)}}}\n", ns) + return ns["f"] + + +def call_with(f, npos, name, value): + """`f(0, 1, ..., name=value)` from a literal keyword call site.""" + ns = {"f": f} + pos = "".join(f"{i}, " for i in range(npos)) + exec(f"def run():\n return f({pos}{name}={value!r})\n", ns) + return ns["run"] + + +for npos, nkw in [(0, 15), (0, 16), (0, 17), (1, 15), (2, 13), (2, 14), (2, 15), (3, 14)]: + for varkw in (False, True): + f = make(npos, nkw, varkw) + for j in (0, nkw // 2, nkw - 1): + name = f"k{j}" + run = call_with(f, npos, name, "X") + for _ in range(300): + got = run() + assert got[name] == "X", (npos, nkw, varkw, name, got) + for i in range(nkw): + if i != j: + assert got[f"k{i}"] is None, (npos, nkw, varkw, name, got) + if varkw: + got = call_with(f, npos, "extra", 1)() + assert got["rest"] == {"extra": 1}, got + + +def deco(cls, **kw): + return dataclasses.dataclass(cls, **kw) + + +for _ in range(300): + C = dataclasses.make_dataclass("C", [("x", int)], decorator=deco) + assert repr(C(1)) == "C(x=1)" + +print("kw binding slot limit: ok") diff --git a/tests/regrtest/test_library_fastpaths.py b/tests/regrtest/test_library_fastpaths.py new file mode 100644 index 00000000..40501905 --- /dev/null +++ b/tests/regrtest/test_library_fastpaths.py @@ -0,0 +1,91 @@ +"""Native shortcuts behind library-heavy code keep their exact answers. + +- `getattr(obj, dunder)` for a builtin method a plain instance inherits + (`copy` fetches `__reduce_ex__` this way) binds as the full lookup does, + defers to an instance-dict entry, and leaves weak proxies alone. +- `str.startswith`/`endswith` with a start position on long strings, ASCII + or not, count characters, not bytes. +- One-character strings from indexing are the shared Latin-1 objects. +- `math.gcd` over machine words, 128-bit values, power-of-two factors, + and mixed big and small operands. +""" + +import math +import random +import unittest +import weakref + + +class Plain: + pass + + +class LibraryFastpathTest(unittest.TestCase): + def test_getattr_builtin_dunder(self): + p = Plain() + for _ in range(1000): + m = getattr(p, "__reduce_ex__", None) + self.assertIs(m.__self__, p) + self.assertEqual(m, object.__getattribute__(p, "__reduce_ex__")) + self.assertTrue(hasattr(p, "__reduce_ex__")) + self.assertEqual(getattr(p, "__format__")(""), str(p)) + p.__dict__["__reduce_ex__"] = "mine" + self.assertEqual(getattr(p, "__reduce_ex__", None), "mine") + target = Plain() + proxy = weakref.proxy(target) + self.assertIs(getattr(proxy, "__reduce_ex__").__self__, target) + + def test_startswith_positions(self): + ascii_text = "key = value\n" * 20 + wide_text = "été = ☃\n" * 20 + for text in (ascii_text, wide_text): + n = len(text) + for pos in range(0, n + 1, 7): + for needle in ("key", "ét", "=", "\n", ""): + self.assertEqual( + text.startswith(needle, pos), text[pos:].startswith(needle) + ) + self.assertEqual( + text.endswith(needle, 0, pos), text[:pos].endswith(needle) + ) + self.assertFalse(text.startswith("", n + 1)) + self.assertTrue(text.startswith(("zz", text[5]), 5)) + self.assertTrue(wide_text.startswith("☃", 6)) + + def test_index_chars_are_shared(self): + s = "abcé" * 50 + for i in range(len(s)): + c = s[i] + self.assertEqual(c, chr(ord(c))) + self.assertIs(s[0], "a") + self.assertIs(s[3], "é") + self.assertIs("".join(["x", "y"])[1], "y") + + def test_gcd(self): + r = random.Random(7) + cases = [(0, 0), (0, 5), (-6, 0), (-2**63, 0), (-2**63, -2**63), + (True, 4), (False, False), (2**200, 6 * 2**150), (3**80, 3**40 * 7), + (2**64 + 1, 2**64 - 1), (25, 2**300 * 5)] + for _ in range(500): + a = r.getrandbits(r.choice([5, 60, 64, 100, 128, 200])) << r.randrange(70) + b = r.getrandbits(r.choice([3, 40, 64, 130, 300])) << r.randrange(70) + cases.append((a * r.choice([1, -1]), b)) + for a, b in cases: + g = math.gcd(a, b) + self.assertIs(type(g), int) + self.assertGreaterEqual(g, 0) + if g: + self.assertEqual(a % g, 0) + self.assertEqual(b % g, 0) + self.assertEqual(math.gcd(a // g, b // g), 1) + else: + self.assertEqual((a, b), (0, 0)) + self.assertEqual(math.gcd(12, 18, 27), 3) + self.assertEqual(math.gcd(2**70 * 3, 2**65 * 9, 2**80 * 15), 2**65 * 3) + self.assertEqual(math.gcd(), 0) + with self.assertRaises(TypeError): + math.gcd(1.0, 2) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_metaclass_call_dispatch.py b/tests/regrtest/test_metaclass_call_dispatch.py new file mode 100644 index 00000000..566ffc94 --- /dev/null +++ b/tests/regrtest/test_metaclass_call_dispatch.py @@ -0,0 +1,175 @@ +"""Calling a class whose metaclass defines `__call__` runs that method +with the class as its receiver, in positional and keyword calls, through +inherited, replaced and non-function `__call__`s, and with exceptions +and argument lifetimes intact.""" + +import enum +import gc + + +class Meta(type): + def __call__(cls, *args, **kw): + return ("meta", cls.__name__, args, sorted(kw.items())) + + +class A(metaclass=Meta): + pass + + +class B(A): + pass + + +def call_a(c): + return c(1, 2) + + +def call_a_kw(c): + return c(1, k=2) + + +for _ in range(300): + assert call_a(A) == ("meta", "A", (1, 2), []) + assert call_a(B) == ("meta", "B", (1, 2), []) + assert call_a_kw(A) == ("meta", "A", (1,), [("k", 2)]) + + +# Replacing the metaclass's `__call__` after the sites warmed up. +def new_call(cls, *args, **kw): + return ("new", cls.__name__, len(args), len(kw)) + + +Meta.__call__ = new_call +for _ in range(100): + assert call_a(A) == ("new", "A", 2, 0) + assert call_a_kw(B) == ("new", "B", 1, 1) +del Meta.__call__ +for _ in range(100): + try: + call_a(A) + except TypeError as e: + assert str(e) == "A() takes no arguments", str(e) + else: + raise AssertionError("expected TypeError") + + +# A `__call__` that is not a plain function is honored as such. +class StaticMeta(type): + __call__ = staticmethod(lambda *args: ("static", args)) + + +class S(metaclass=StaticMeta): + pass + + +class ClassMeta(type): + @classmethod + def __call__(mcls, *args): + return ("classmethod", mcls.__name__, args) + + +class Cm(metaclass=ClassMeta): + pass + + +for _ in range(200): + assert S(1) == ("static", (1,)) + assert Cm(1) == ("classmethod", "ClassMeta", (1,)) + + +# A metaclass `__call__` delegating to `type.__call__`. +class Counting(type): + count = 0 + + def __call__(cls, *args, **kw): + Counting.count += 1 + return super().__call__(*args, **kw) + + +class P(metaclass=Counting): + def __init__(self, x, y=0): + self.x, self.y = x, y + + +for i in range(300): + p = P(i, y=1) if i % 2 else P(i) + assert p.x == i and p.y == i % 2 +assert Counting.count == 300 + + +# Exceptions raised inside the metaclass `__call__` propagate with it in +# the traceback. +class Raising(type): + def __call__(cls, *args): + raise ValueError("no " + cls.__name__) + + +class R(metaclass=Raising): + pass + + +for _ in range(100): + try: + R(1) + except ValueError as e: + assert str(e) == "no R" + tb = e.__traceback__ + names = [] + while tb is not None: + names.append(tb.tb_frame.f_code.co_name) + tb = tb.tb_next + assert names[-1] == "__call__", names + else: + raise AssertionError("expected ValueError") + + +# Enum lookups by value go through `EnumType.__call__`. +class Color(enum.Enum): + RED = 1 + GREEN = 2 + + +for _ in range(300): + assert Color(1) is Color.RED + assert Color(value=2) is Color.GREEN +try: + Color(3) +except ValueError as e: + assert str(e) == "3 is not a valid Color", str(e) +else: + raise AssertionError("expected ValueError") + + +# The argument's last reference dies with the call. +class Tracked: + alive = 0 + + def __init__(self): + Tracked.alive += 1 + + def __del__(self): + Tracked.alive -= 1 + + +class Drop(type): + def __call__(cls, arg): + return 1 + + +class D(metaclass=Drop): + pass + + +def make_d(): + D(Tracked()) + return Tracked.alive + + +gc.disable() +try: + for _ in range(300): + assert make_d() == 0 +finally: + gc.enable() + +print("ok") diff --git a/tests/regrtest/test_next_default_inline.py b/tests/regrtest/test_next_default_inline.py new file mode 100644 index 00000000..b564279d --- /dev/null +++ b/tests/regrtest/test_next_default_inline.py @@ -0,0 +1,165 @@ +"""`next(gen, default)` resumes the generator inline, as `next(gen)` does, +with the default waiting atop the caller's stack until the generator +yields (the value replaces it) or finishes (it is the result); see +`InlineResume::NextDefault` in the VM. Each case runs warm (loops long +enough to compile the caller) and compares with the general path. +""" + +import sys +import unittest + +WARM = 3000 + + +def count(n): + for i in range(n): + yield i + + +def returns(n): + yield n + return "ignored" + + +def raises(): + yield 1 + raise KeyError("inner") + + +def leaky(): + yield 1 + raise StopIteration + + +class Tree: + __slots__ = ("left", "value", "right") + + def __init__(self, left, value, right): + self.left = left + self.value = value + self.right = right + + def __iter__(self): + if self.left: + yield from self.left + yield self.value + if self.right: + yield from self.right + + +def build(lo, hi): + if lo >= hi: + return None + mid = (lo + hi) // 2 + return Tree(build(lo, mid), mid, build(mid + 1, hi)) + + +def pairs(it): + it = iter(it) + for a in it: + b = next(it, -1) + yield a, b + + +def relay(it, default): + while True: + v = yield next(it, default) + if v is not None: + return v + + +class Mortal: + deaths = 0 + + def __del__(self): + Mortal.deaths += 1 + + +class NextDefaultTests(unittest.TestCase): + def test_values_then_default_warm(self): + for n in range(WARM // 100): + g = count(n) + got = [next(g, None) for _ in range(n + 2)] + self.assertEqual(got, list(range(n)) + [None, None]) + + def test_loop_warm(self): + total = 0 + g = count(WARM) + while (v := next(g, -1)) != -1: + total += v + self.assertEqual(total, sum(range(WARM))) + self.assertEqual(next(g, "done"), "done") + + def test_return_value_ignored(self): + for _ in range(WARM): + g = returns(3) + self.assertEqual(next(g, 0), 3) + self.assertEqual(next(g, 0), 0) + self.assertEqual(next(g, 0), 0) + + def test_raise_propagates(self): + for _ in range(WARM // 10): + g = raises() + self.assertEqual(next(g, 0), 1) + with self.assertRaises(KeyError): + next(g, 0) + self.assertEqual(next(g, "after"), "after") + + def test_pep479(self): + g = leaky() + next(g, 0) + with self.assertRaises(RuntimeError): + next(g, 0) + + def test_tree_pairs(self): + tree = build(0, 101) + for _ in range(30): + got = list(pairs(tree)) + expected = [(a, a + 1) for a in range(0, 100, 2)] + [(100, -1)] + self.assertEqual(got, expected) + + def test_yield_of_next(self): + for _ in range(WARM // 10): + r = relay(count(3), "end") + self.assertEqual([next(r) for _ in range(5)], [0, 1, 2, "end", "end"]) + with self.assertRaises(StopIteration) as cm: + r.send(7) + self.assertEqual(cm.exception.value, 7) + + def test_default_released(self): + for _ in range(WARM // 10): + g = count(1) + next(g, Mortal()) + Mortal.deaths = 0 + g = count(1) + self.assertEqual(next(g, Mortal()), 0) + self.assertEqual(Mortal.deaths, 1) + self.assertIsInstance(next(g, Mortal()), Mortal) + self.assertEqual(Mortal.deaths, 2) + + def test_running_generator(self): + def selfish(): + yield next(me, "default") + + me = selfish() + with self.assertRaises(ValueError): + next(me, None) + + def test_unstarted_and_closed(self): + g = count(2) + g.close() + self.assertEqual(next(g, "closed"), "closed") + g = count(2) + self.assertEqual(next(g, "x"), 0) + + def test_frame_line_during_resume(self): + def probe(): + yield sys._getframe(1).f_lineno + + for _ in range(WARM // 10): + line = next(probe(), None); expected = sys._getframe().f_lineno + self.assertEqual(line, expected) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_polymorphic_direct_sites.py b/tests/regrtest/test_polymorphic_direct_sites.py new file mode 100644 index 00000000..11c116cf --- /dev/null +++ b/tests/regrtest/test_polymorphic_direct_sites.py @@ -0,0 +1,150 @@ +"""A polymorphic call site's direct-call cache. + +A compiled `CALL` site keeps several callees (compiled bodies and +frameless leaves alike) and replaces them round robin. Whatever the mix, +and however often it changes, each call must run its own callee with +its own arguments and defaults, and a callee whose code is swapped or +whose body compiles later must still run as itself. +""" + +import sys +import unittest + +N = 3000 +FORCED = "--forced-frame-jit" + + +class Num: + def __init__(self, v): + self.v = v + + def eval(self, env): + return self.v + + +class Var: + def __init__(self, name): + self.name = name + + def eval(self, env): + return env[self.name] + + +class Neg: + def __init__(self, inner): + self.inner = inner + + def eval(self, env): + t = [self.inner.eval(env)] + return -t[0] + + +class Add: + def __init__(self, a, b): + self.a = a + self.b = b + + def eval(self, env): + t = [self.a.eval(env), self.b.eval(env)] + return t[0] + t[1] + + +class Scaled: + def __init__(self, inner, k=3): + self.inner = inner + self.k = k + + def eval(self, env, k=None): + t = [self.inner.eval(env)] + return t[0] * (self.k if k is None else k) + + +class Const: + def eval(self, env, bonus=7): + return bonus + + +def tree(): + return Add( + Add(Num(1), Var("x")), + Add(Neg(Var("y")), Add(Scaled(Num(2)), Add(Const(), Scaled(Var("x"), 5)))), + ) + + +def run(nodes, env, n): + s = 0 + for i in range(n): + node = nodes[i % len(nodes)] + s += node.eval(env) + return s + + +def expected(nodes, env, n): + vals = [node.eval(env) for node in nodes] + return sum(vals[i % len(vals)] for i in range(n)) + + +class PolymorphicSiteTest(unittest.TestCase): + def test_forced_frame_jit(self): + if FORCED in sys.argv: + self.skipTest("already forced") + import os + import subprocess + + env = dict(os.environ) + env.update( + WEAVEPY_JIT="0", + WEAVEPY_FRAME_JIT_TUNE="8,1,3,0", + WEAVEPY_FRAME_JIT_HOT="50", + ) + r = subprocess.run( + [sys.executable, __file__, FORCED], + env=env, + capture_output=True, + text=True, + ) + self.assertEqual(r.returncode, 0, r.stderr) + + def test_megamorphic_mix(self): + env = {"x": 4, "y": 9} + t = tree() + nodes = [t, Num(5), Var("y"), Neg(Num(3)), Scaled(Var("x")), Const()] + self.assertEqual(run(nodes, env, N), expected(nodes, env, N)) + + def test_changing_mix(self): + env = {"x": 2, "y": 3} + groups = [ + [Num(1), Var("x")], + [Neg(Num(2)), Const(), Scaled(Num(1), 4)], + [Add(Num(1), Num(2)), Var("y"), Num(9), Neg(Var("x")), Const()], + ] + for _ in range(3): + for nodes in groups: + self.assertEqual(run(nodes, env, N // 3), expected(nodes, env, N // 3)) + + def test_swapped_code(self): + env = {"x": 1, "y": 1} + nodes = [Num(1), Var("x"), Neg(Num(1)), Const()] + self.assertEqual(run(nodes, env, N), expected(nodes, env, N)) + saved = Num.eval.__code__ + try: + Num.eval.__code__ = (lambda self, env: self.v * 100).__code__ + self.assertEqual(run(nodes, env, N), expected(nodes, env, N)) + finally: + Num.eval.__code__ = saved + self.assertEqual(run(nodes, env, N), expected(nodes, env, N)) + + def test_deep_recursion_through_the_site(self): + node = Num(1) + for _ in range(150): + node = Neg(node) + for _ in range(20): + self.assertEqual(node.eval({}), 1) + for _ in range(sys.getrecursionlimit()): + node = Neg(node) + with self.assertRaises(RecursionError): + node.eval({}) + + +if __name__ == "__main__": + unittest.main(argv=[a for a in sys.argv if a != FORCED]) diff --git a/tests/regrtest/test_polymorphic_method_loads.py b/tests/regrtest/test_polymorphic_method_loads.py new file mode 100644 index 00000000..c6a12da0 --- /dev/null +++ b/tests/regrtest/test_polymorphic_method_loads.py @@ -0,0 +1,66 @@ +# A method load site that sees several receiver classes keeps each one's +# method, and must still notice an instance attribute that shadows the +# method, a method replaced on its class, and a class reassigned on an +# instance. + + +class A: + def __init__(self): + self.v = 1 + + def get(self): + return "A" + + +class B: + def __init__(self): + self.v = 2 + + def get(self): + return "B" + + +class C(B): + def get(self): + return "C" + + +class D: + def get(self): + return "D" + + +def run(objs, n=200): + out = [] + for _ in range(n): + out = [o.get() for o in objs] + return out + + +objs = [A(), B(), C(), D()] +assert run(objs) == ["A", "B", "C", "D"] + +# An instance attribute shadows its class's method. +b2 = B() +b2.get = lambda: "shadow" +assert run([A(), b2, C(), D()]) == ["A", "shadow", "C", "D"] + +# A method replaced on its class (and on a base class). +B.get = lambda self: "B2" +assert run(objs) == ["A", "B2", "C", "D"] +del C.get +assert run(objs) == ["A", "B2", "B2", "D"] + +# A class reassigned on an instance. +a = A() +a.__class__ = D +assert run([a, objs[1], objs[2], objs[3]]) == ["D", "B2", "B2", "D"] + +# An attribute added after the site cached the method, on an instance with +# split values of its own. +late = A() +assert run([late, objs[1]]) == ["A", "B2"] +late.get = lambda: "late" +assert run([late, objs[1]]) == ["late", "B2"] + +print("test_polymorphic_method_loads: OK") diff --git a/tests/regrtest/test_pyc_roundtrip.py b/tests/regrtest/test_pyc_roundtrip.py index a83117a0..370ab165 100644 --- a/tests/regrtest/test_pyc_roundtrip.py +++ b/tests/regrtest/test_pyc_roundtrip.py @@ -72,4 +72,20 @@ def code_to_timestamp_pyc(code, mtime=0, source_size=0): assert ns2["VALUE"] == 37 assert ns2["compute"](3) == 10 +# ---------- an inlined comprehension's name, later a closure cell ---------- +# `k` is a plain local of the first comprehension and a cell of the +# second; the optimizer stores the first's result before restoring `k` +# (`POP_ITER; STORE_FAST counts; STORE_FAST k`), so the decoder must end +# the first comprehension's region there, or the second's closure reads +# the plain local. +src = ( + "def summarize(widgets, kinds):\n" + " counts = {k: len(v) for k, v in widgets.items()}\n" + " found = {k: sum(1 for w in widgets if w is k) for k in kinds}\n" + " return counts, found\n" +) +ns3 = {} +exec(marshal.loads(marshal.dumps(compile(src, "", "exec"))), ns3) +assert ns3["summarize"]({1: [0], 2: []}, [1, 3]) == ({1: 1, 2: 0}, {1: 1, 3: 0}) + print("test_pyc_roundtrip: OK") diff --git a/tests/regrtest/test_regex_quick_asserts.py b/tests/regrtest/test_regex_quick_asserts.py new file mode 100644 index 00000000..2a89f506 --- /dev/null +++ b/tests/regrtest/test_regex_quick_asserts.py @@ -0,0 +1,65 @@ +"""Lookarounds over one character test, and `str.translate` tables. + +The matcher answers an assertion whose body tests one character (a +literal or a set, possibly case-folded) or a position, or an alternation +of such tests, without entering itself. Lookaheads and lookbehinds, +negated or not, at the subject's edges, and mixed with bodies it cannot +answer that way must agree with the full matcher. `str.translate` looks +each ASCII character up once per call. +""" + +import re +import textwrap +import unittest + + +class QuickAssertTest(unittest.TestCase): + def check(self, pattern, text, expected): + self.assertEqual(re.findall(pattern, text), expected, pattern) + + def test_single_tests(self): + self.check(r"a(?=b)", "ab ac a", ["a"]) + self.check(r"a(?!b)", "ab ac a", ["a", "a"]) + self.check(r"(?<=-)\w", "a-b c-d -", ["b", "d"]) + self.check(r"(? 1: + assert True in s and 1.0 in s and -0.0 in s and 0.0 in s + assert (size + 0.5) not in s + assert "0" not in s + # Unhashable probes raise; a set probe retries as a frozenset. + try: + [] in s + except TypeError: + pass + else: + raise AssertionError("unhashable list probe did not raise") + assert set() not in s + + m = set(base) + m.add(True) + m.add(1.0) + assert len(m) == max(size, 2) if size else len(m) == 1 + if size > 1: + # The first-inserted key stays. + assert type([x for x in m if x == 1][0]) is int + + # NaN: identity finds the stored object; another NaN is a new key. + nan = float("nan") + m = set(base) + m.add(nan) + assert nan in m + assert float("nan") not in m + m.add(float("nan")) + assert len(m) == size + 2 + m.discard(nan) + assert nan not in m and len(m) == size + 1 + + # A user hash runs once per probe, and once per insert. + m = set(base) + Hashed.calls = 0 + k = Hashed(3) + m.add(k) + assert Hashed.calls == 1, Hashed.calls + assert Hashed(3) in m + assert Hashed.calls == 2, Hashed.calls + assert Hashed(4, 3) not in m + assert Hashed.calls == 3, Hashed.calls + m.discard(Hashed(3)) + assert Hashed.calls == 4 and k not in m + + # A raising hash surfaces from every operation, even on an empty set. + for op in (lambda t: BadHash() in t, lambda t: t.add(BadHash()), + lambda t: t.discard(BadHash())): + try: + op(set(base)) + except ZeroDivisionError: + pass + else: + raise AssertionError("hash error swallowed") + + # A raising __eq__ surfaces only when hashes collide. + m = set(base) + m.add(BadEq()) + try: + BadEq() in m + except ValueError: + pass + else: + raise AssertionError("eq error swallowed") + assert Hashed(77, 10**9 + 8) not in m + + # Changing size during iteration raises; same-size churn does not crash. + m = set(base) | {"x"} + try: + for v in m: + m.add(object()) + except RuntimeError as e: + assert "changed size during iteration" in str(e), e + else: + raise AssertionError("set mutation during iteration not detected") + m = set(base) | {"x"} + seen = 0 + for v in m: + m.discard(v) + m.add(v) + seen += 1 + if seen > 3 * len(m) + 3: + break + + # Removals keep every survivor findable. + m = set(range(size)) + for i in range(0, size, 3): + m.remove(i) + assert m == {i for i in range(size) if i % 3} + assert all(i in m for i in range(size) if i % 3) + while m: + x = m.pop() + assert x not in m + +# Set algebra and comparisons across sizes and types. +a = set(range(0, 60, 2)) +b = frozenset(range(0, 60, 3)) +assert a & b == {x for x in range(60) if x % 6 == 0} +assert a | b == {x for x in range(60) if x % 2 == 0 or x % 3 == 0} +assert a - b == {x for x in range(0, 60, 2) if x % 3} +assert a ^ b == (a | b) - (a & b) +assert frozenset(a) == a and a == frozenset(a) +assert hash(frozenset(a)) == hash(frozenset(sorted(a, reverse=True))) +assert {1, 2} < {1, 2, 3} and not {1, 2} < {1, 2} +assert {1.0, 2} == {True, 2.0} +print("set table ok") diff --git a/tests/regrtest/test_setitem_python_dunder.py b/tests/regrtest/test_setitem_python_dunder.py new file mode 100644 index 00000000..37e21514 --- /dev/null +++ b/tests/regrtest/test_setitem_python_dunder.py @@ -0,0 +1,136 @@ +"""`obj[key] = value` on an instance whose class defines `__setitem__` +in Python: the method runs with the right arguments at every execution +of a warm site, its result is discarded, exceptions carry its frame, a +changed `__setitem__` takes effect, and replaced values die on time.""" + +import gc + + +class Store: + def __init__(self): + self.log = [] + + def __setitem__(self, key, value): + self.log.append((key, value)) + return "ignored" + + +s = Store() +for i in range(300): + s[i] = i * 2 + s["k"] = (s, i) +assert s.log[:2] == [(0, 0), ("k", (s, 0))] +assert len(s.log) == 600 + + +# A dict subclass funnelling stores through its own logic. +class Doubling(dict): + def __setitem__(self, key, value): + dict.__setitem__(self, key, value * 2) + + +d = Doubling() +for i in range(300): + d[i % 7] = i +assert d[299 % 7] == 598 and len(d) == 7 + + +# Exceptions propagate with the method's frame in the traceback. +class Picky: + def __setitem__(self, key, value): + if key < 0: + raise KeyError(key) + + +p = Picky() +for i in range(200): + p[i] = i + try: + p[-i - 1] = i + except KeyError as e: + assert e.args == (-i - 1,) + tb = e.__traceback__ + names = [] + while tb is not None: + names.append(tb.tb_frame.f_code.co_name) + tb = tb.tb_next + assert names[-1] == "__setitem__", names + else: + raise AssertionError("expected KeyError") + + +# Reassigning `__setitem__` after warm-up, including to one that takes +# defaults or isn't a plain function. +class Swappable: + def __setitem__(self, key, value): + self.last = ("first", key, value) + + +sw = Swappable() + + +def store(obj, k, v): + obj[k] = v + + +for i in range(300): + store(sw, i, i) +assert sw.last == ("first", 299, 299) + + +def second(self, key, value, extra="x"): + self.last = ("second", key, value, extra) + + +Swappable.__setitem__ = second +for i in range(50): + store(sw, i, i) +assert sw.last == ("second", 49, 49, "x") + + +seen = [] +Swappable.__setitem__ = staticmethod(lambda k, v: seen.append(("static", k, v))) +store(sw, 1, 2) +assert seen == [("static", 1, 2)] +del Swappable.__setitem__ +try: + store(sw, 1, 2) +except TypeError as e: + assert "does not support item assignment" in str(e), str(e) +else: + raise AssertionError("expected TypeError") + + +# A replaced value dies when the store drops it, and the stored value +# and key are released when the method is done with them. +class Tracked: + alive = 0 + + def __init__(self): + Tracked.alive += 1 + + def __del__(self): + Tracked.alive -= 1 + + +class Drop: + def __setitem__(self, key, value): + pass + + +dr = Drop() + + +def drop_store(): + dr[Tracked()] = Tracked() + return Tracked.alive + + +gc.disable() +try: + for _ in range(300): + assert drop_store() == 0 +finally: + gc.enable() + +print("ok") diff --git a/tests/regrtest/test_site_tables.py b/tests/regrtest/test_site_tables.py new file mode 100644 index 00000000..d7220a99 --- /dev/null +++ b/tests/regrtest/test_site_tables.py @@ -0,0 +1,127 @@ +"""Per-site caches must stay with their own instruction. + +The interpreter keeps its attribute, global, method and call caches in +tables with an entry per *site* instruction rather than per instruction, +so each lookup maps the instruction to its entry. These checks run warm +code whose neighboring sites read different names from the same objects +(a cache answered for the wrong site returns the other name's value), and +code with more sites than the tables index. +""" + + +class A: + __slots__ = () + k = "A.k" + + def __init__(self): + pass + + +class P: + def __init__(self, x, y, z): + self.x = x + self.y = y + self.z = z + + def total(self): + return self.x + self.y + self.z + + def swap(self): + return P(self.y, self.x, self.z) + + +class Q(P): + def total(self): + return -(self.x + self.y + self.z) + + +class R: + def __init__(self, x, y, z): + self.z = z + self.y = y + self.x = x + + def total(self): + return self.x * 100 + self.y * 10 + self.z + + +SCALE = 3 + + +def neighbors(objs): + out = [] + for o in objs: + # Adjacent attribute sites with different names on one receiver, + # separated by non-site instructions. + a = o.x + b = o.y + c = o.z + out.append((a, b, c, o.total(), SCALE, len(out))) + return out + + +class Ctx: + def __init__(self, log, tag): + self.log = log + self.tag = tag + + def __enter__(self): + self.log.append("enter " + self.tag) + return self.tag + + def __exit__(self, *exc): + self.log.append("exit " + self.tag) + return False + + +class Ctx2(Ctx): + def __enter__(self): + self.log.append("enter2 " + self.tag) + return self.tag * 2 + + +def contexts(n): + log = [] + got = [] + for i in range(n): + with Ctx(log, "a") as x: + got.append(x) + with (Ctx2 if i % 2 else Ctx)(log, "b") as y: + got.append(y) + return log, got + + +for round_ in range(40): + objs = [P(1, 2, 3), Q(4, 5, 6), R(7, 8, 9), P(10, 20, 30)] + if round_ == 20: + SCALE = 4 + got = neighbors(objs) + scale = 3 if round_ < 20 else 4 + assert got == [ + (1, 2, 3, 6, scale, 0), + (4, 5, 6, -15, scale, 1), + (7, 8, 9, 789, scale, 2), + (10, 20, 30, 60, scale, 3), + ], (round_, got) + swapped = [o.swap() for o in objs if type(o) is P] + assert [(s.x, s.y, s.z) for s in swapped] == [(2, 1, 3), (20, 10, 30)] + assert A().k == "A.k" + +log, got = None, None +for _ in range(20): + log, got = contexts(6) +assert got == ["a", "b", "a", "bb"] * 3, got +assert log[:4] == ["enter a", "exit a", "enter b", "exit b"], log[:4] +assert log[6:8] == ["enter2 b", "exit b"], log[6:8] + +# More attribute sites than the tables index (65,535): the ones past +# the limit run uncached, and every site still reads its own name. +lines = ["def many(o):", " t = 0"] +for i in range(13200): + lines.append(" t += o.x - o.z + o.y - o.y + o.z") +lines.append(" return t, o.y, o.x") +ns = {} +exec("\n".join(lines), ns) +many = ns["many"] +for o in (P(5, 7, 2), R(5, 7, 2), Q(5, 7, 2)) * 2: + assert many(o) == (13200 * 5, 7, 5), many(o) diff --git a/tests/regrtest/test_slot_field_sites.py b/tests/regrtest/test_slot_field_sites.py new file mode 100644 index 00000000..ddce7133 --- /dev/null +++ b/tests/regrtest/test_slot_field_sites.py @@ -0,0 +1,272 @@ +"""Attribute sites that remember a `__slots__` member's layout position. + +A warm `x.attr` or `x.attr = v` site on a slotted class reads or writes +the member by its position in the class's slot layout, and a store-only +`__init__` fills a fresh instance's members directly. Each shortcut must +step aside whenever the position stops naming the member: another class +at the site, `__class__` assignment between layouts that order the same +names differently, a class attribute replacing the member descriptor, an +unset (or deleted) member, `__getattr__`/`__getattribute__` overrides, +and a recycled instance taken over by another class. Releases must stay +prompt, so `__del__` runs exactly when a slot's old value goes. +""" + +import gc +import unittest + + +class XY: + __slots__ = ("x", "y") + + def __init__(self, x, y): + self.x = x + self.y = y + + +class YX: + __slots__ = ("y", "x") + + def __init__(self, x, y): + self.x = x + self.y = y + + +class XYZ(XY): + __slots__ = ("z",) + + def __init__(self, x, y, z=0): + self.x = x + self.y = y + self.z = z + + +class WithDict: + __slots__ = ("a", "__dict__") + + def __init__(self, a, b): + self.a = a + self.b = b + + +class Fallback: + __slots__ = ("x",) + + def __getattr__(self, name): + return ("fallback", name) + + +class Tracked: + log = [] + + def __init__(self, tag): + self.tag = tag + + def __del__(self): + Tracked.log.append(self.tag) + + +def read_xy(p): + return p.x * 10 + p.y + + +def write_xy(p, x, y): + p.x = x + p.y = y + + +class SlotFieldSiteTest(unittest.TestCase): + def test_reads_and_writes_warm(self): + p = XY(1, 2) + for i in range(3000): + write_xy(p, i, i + 1) + self.assertEqual(read_xy(p), i * 10 + i + 1) + + def test_polymorphic_site(self): + objs = [XY(1, 2), YX(3, 4), XYZ(5, 6, 7)] + for _ in range(2000): + got = [read_xy(o) for o in objs] + self.assertEqual(got, [12, 34, 56]) + for o in objs: + write_xy(o, o.y, o.x) + write_xy(o, o.y, o.x) + + def test_class_assignment_between_orders(self): + for i in range(1500): + p = XY(i, -i) + self.assertEqual(read_xy(p), i * 10 - i) + p.__class__ = YX + self.assertEqual((p.x, p.y), (i, -i)) + self.assertEqual(read_xy(p), i * 10 - i) + write_xy(p, -i, i) + self.assertEqual((p.x, p.y), (-i, i)) + p.__class__ = XY + self.assertEqual(read_xy(p), -i * 10 + i) + + def test_unset_and_deleted_members(self): + p = XY(1, 2) + for i in range(2000): + self.assertEqual(read_xy(p), 12) + del p.y + with self.assertRaises(AttributeError): + read_xy(p) + q = XY.__new__(XY) + with self.assertRaises(AttributeError): + read_xy(q) + q.y = 5 + with self.assertRaises(AttributeError): + read_xy(q) + q.x = 4 + self.assertEqual(read_xy(q), 45) + + def test_getattr_fallback_on_unset_member(self): + f = Fallback() + + def get(o): + return o.x + + for _ in range(2000): + self.assertEqual(get(f), ("fallback", "x")) + f.x = 1 + for _ in range(2000): + self.assertEqual(get(f), 1) + del f.x + self.assertEqual(get(f), ("fallback", "x")) + + def test_member_replaced_by_class_attribute(self): + class C: + __slots__ = ("v",) + + def __init__(self, v): + self.v = v + + def get(o): + return o.v + + c = C(3) + for _ in range(3000): + self.assertEqual(get(c), 3) + member = C.__dict__["v"] + C.v = property(lambda self: "prop") + self.assertEqual(get(c), "prop") + C.v = member + self.assertEqual(get(c), 3) + + def test_getattribute_override_in_subclass(self): + class Loud(XY): + __slots__ = () + + def __getattribute__(self, name): + if name == "x": + return 100 + return object.__getattribute__(self, name) + + p = XY(1, 2) + for _ in range(2000): + self.assertEqual(read_xy(p), 12) + self.assertEqual(read_xy(Loud(1, 2)), 1002) + + def test_setattr_override(self): + class Upper(XY): + __slots__ = () + + def __setattr__(self, name, value): + object.__setattr__(self, name, value * 2) + + p = XY(0, 0) + for i in range(2000): + write_xy(p, i, i) + u = Upper(1, 2) + self.assertEqual((u.x, u.y), (2, 4)) + write_xy(u, 3, 4) + self.assertEqual((u.x, u.y), (6, 8)) + object.__setattr__(u, "x", 7) + self.assertEqual(u.x, 7) + + def test_store_only_init_shared_with_subclass(self): + class Base: + __slots__ = ("a", "b") + + def __init__(self, a, b): + self.a = a + self.b = b + + class Pre(Base): + __slots__ = ("c",) + + class Plain(Base): + pass + + for i in range(2000): + b = Base(i, i + 1) + p = Pre(i, i + 2) + q = Plain(i, i + 3) + self.assertEqual((b.a, b.b), (i, i + 1)) + self.assertEqual((p.a, p.b), (i, i + 2)) + self.assertEqual((q.a, q.b), (i, i + 3)) + self.assertFalse(hasattr(p, "c")) + self.assertEqual(q.__dict__, {}) + w = WithDict(1, 2) + for i in range(2000): + w = WithDict(i, i * 2) + self.assertEqual((w.a, w.b, w.__dict__), (1999, 3998, {"b": 3998})) + + def test_repeated_store_in_init(self): + class Twice: + __slots__ = ("v", "w") + + def __init__(self, a, b): + self.v = a + self.v = b + + for i in range(2000): + t = Twice(i, -i) + self.assertEqual(t.v, -i) + self.assertFalse(hasattr(t, "w")) + + def test_recycled_instances_switch_classes(self): + for i in range(3000): + a = XY(i, 1) + b = YX(2, i) + c = XYZ(i, i, i) + self.assertEqual((a.x, a.y, b.x, b.y), (i, 1, 2, i)) + self.assertEqual((c.x, c.y, c.z), (i, i, i)) + del a, b, c + fresh = YX.__new__(YX) + self.assertFalse(hasattr(fresh, "x")) + self.assertFalse(hasattr(fresh, "y")) + + def test_release_timing(self): + Tracked.log.clear() + p = XY(None, None) + for i in range(500): + write_xy(p, Tracked(i), None) + if i: + self.assertEqual(Tracked.log[-1], i - 1) + p.x = None + self.assertEqual(Tracked.log[-1], 499) + Tracked.log.clear() + for i in range(500): + q = XY(Tracked(i), 0) + del q + self.assertEqual(Tracked.log, [i]) + Tracked.log.clear() + + def test_self_reference_is_collected(self): + class Node: + __slots__ = ("me", "tag", "__weakref__") + + def __init__(self, tag): + self.me = self + self.tag = tag + + import weakref + + refs = [] + for i in range(500): + refs.append(weakref.ref(Node(i))) + gc.collect() + self.assertTrue(all(r() is None for r in refs)) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_slot_store_init.py b/tests/regrtest/test_slot_store_init.py new file mode 100644 index 00000000..cf46cf0b --- /dev/null +++ b/tests/regrtest/test_slot_store_init.py @@ -0,0 +1,235 @@ +"""Constructors of `__slots__` classes whose `__init__` only stores. + +A hot `cls(args)` of a class whose instances lay their slots out, with an +`__init__` that is nothing but `self.name = ` +stores, fills the fresh instance's slots straight from the arguments once +every store's site has proved its slot. Recycled instances keep their +slot storage for the next instance of the same class. Every way such a +construction can differ (an unset slot, a parameter stored twice or not +at all, a default, the instance stored into itself, a class changed after +warm-up, a subclass's layout, a deleted slot) must behave as the +ordinary call does. +""" + +import gc +import sys +import unittest + +N = 3000 +FORCED = "--forced-frame-jit" + + +class V: + __slots__ = ("x", "y", "z") + + def __init__(self, x, y, z): + self.x = x + self.y = y + self.z = z + + +class Partial: + __slots__ = ("a", "b", "c") + + def __init__(self, a, b): + self.b = b + self.a = a + + +class Twice: + __slots__ = ("p", "q", "tag", "n") + + def __init__(self, v, w=None): + self.p = v + self.q = v + self.tag = "t" + self.n = 3 + + +class Selfish: + __slots__ = ("me", "v", "__weakref__") + + def __init__(self, v): + self.me = self + self.v = v + + +class Base: + __slots__ = ("u", "w") + + def __init__(self, u, w): + self.u = u + self.w = w + + +class Derived(Base): + __slots__ = ("extra",) + + +class Other: + __slots__ = ("k", "m") + + def __init__(self): + pass + + +class Plain: + def __init__(self, x): + self.x = x + + +class Changing: + __slots__ = ("x", "y") + + def __init__(self, x, y): + self.x = x + self.y = y + + +def build_vs(n): + out = [] + for i in range(n): + out.append(V(i, i + 1, i + 2)) + return out + + +def build_partial(n): + s = 0 + for i in range(n): + p = Partial(i, -i) + s += p.a + p.b + return s, p + + +def build_twice(n): + for i in range(n): + t = Twice([i]) + return t + + +def build_selfish(n): + for i in range(n): + s = Selfish(i) + return s + + +def build_derived(n): + for i in range(n): + d = Derived(i, -i) + return d + + +def churn(n): + s = 0 + for i in range(n): + v = V(i, i, i) + s += v.z + return s + + +def build_changing(n): + for i in range(n): + c = Changing(i, i + 1) + return c + + +class SlotStoreInitTest(unittest.TestCase): + def test_forced_frame_jit(self): + # The same cases with small bodies compiled by the frame JIT at + # once (tier 2 off). + if FORCED in sys.argv: + self.skipTest("already forced") + import os + import subprocess + + env = dict(os.environ) + env.update( + WEAVEPY_JIT="0", + WEAVEPY_FRAME_JIT_TUNE="8,1,3,0", + WEAVEPY_FRAME_JIT_HOT="50", + ) + r = subprocess.run( + [sys.executable, __file__, FORCED], + env=env, + capture_output=True, + text=True, + ) + self.assertEqual(r.returncode, 0, r.stderr) + + def test_values(self): + vs = build_vs(N) + for i, v in enumerate(vs): + self.assertEqual((v.x, v.y, v.z), (i, i + 1, i + 2)) + + def test_unset_slot(self): + s, p = build_partial(N) + self.assertEqual(s, 0) + self.assertEqual((p.a, p.b), (N - 1, 1 - N)) + with self.assertRaises(AttributeError): + p.c + + def test_shared_parameter_constants_and_default(self): + t = build_twice(N) + self.assertIs(t.p, t.q) + self.assertEqual(t.p, [N - 1]) + # The list is held by both slots only (and the call's argument). + self.assertEqual(sys.getrefcount(t.p), 3) + self.assertEqual((t.tag, t.n), ("t", 3)) + + def test_instance_stored_into_itself(self): + import weakref + + s = build_selfish(N) + self.assertIs(s.me, s) + self.assertEqual(s.v, N - 1) + r = weakref.ref(s) + del s + gc.collect() + self.assertIsNone(r()) + + def test_subclass_layout(self): + d = build_derived(N) + self.assertEqual((d.u, d.w), (N - 1, 1 - N)) + with self.assertRaises(AttributeError): + d.extra + + def test_recycled_instances_start_unset(self): + self.assertEqual(churn(N), sum(range(N))) + for _ in range(100): + o = Other() + with self.assertRaises(AttributeError): + o.k + with self.assertRaises(AttributeError): + o.m + p = Plain(5) + self.assertEqual(p.x, 5) + self.assertEqual(vars(p), {"x": 5}) + + def test_deleted_slot(self): + vs = build_vs(10) + del vs[3].y + with self.assertRaises(AttributeError): + vs[3].y + vs[3].y = "back" + self.assertEqual(vs[3].y, "back") + self.assertEqual(build_vs(N)[-1].y, N) + + def test_class_changed_after_warm_up(self): + c = build_changing(N) + self.assertEqual((c.x, c.y), (N - 1, N)) + log = [] + saved = Changing.x + try: + Changing.x = property(lambda self: 42, lambda self, v: log.append(v)) + c = build_changing(5) + self.assertEqual(c.x, 42) + self.assertEqual(log, [0, 1, 2, 3, 4]) + self.assertEqual(c.y, 5) + finally: + Changing.x = saved + c = build_changing(N) + self.assertEqual((c.x, c.y), (N - 1, N)) + + +if __name__ == "__main__": + unittest.main(argv=[a for a in sys.argv if a != FORCED]) diff --git a/tests/regrtest/test_split_attr_delete.py b/tests/regrtest/test_split_attr_delete.py new file mode 100644 index 00000000..682355d9 --- /dev/null +++ b/tests/regrtest/test_split_attr_delete.py @@ -0,0 +1,82 @@ +"""Deleting an instance attribute keeps the split layout (no dictionary +is materialized), and the instance still behaves exactly like a dict-backed +one: lookups, `__dict__` order, re-adding, AttributeError, prompt +finalization, and compiled code's cached field reads.""" + + +class O: + def __init__(self): + self.a = 1 + self.b = 2 + self.c = 3 + self.d = 4 + + def total(self): + return self.a + self.c + self.d + + +class Fin: + log = [] + + def __del__(self): + Fin.log.append(1) + + +def run(): + for _ in range(2000): + o = O() + del o.b + assert not hasattr(o, "b") + assert getattr(o, "b", None) is None + assert o.a == 1 and o.c == 3 and o.d == 4 + assert o.total() == 8 + assert list(vars(o)) == ["a", "c", "d"], vars(o) + o.b = 5 + assert list(vars(o).items()) == [("a", 1), ("c", 3), ("d", 4), ("b", 5)] + assert o.b == 5 + + p = O() + del p.a, p.d + assert p.__dict__ == {"b": 2, "c": 3} + p.c = 7 + assert p.c == 7 and getattr(p, "a", None) is None + try: + del p.a + except AttributeError as e: + assert "'a'" in str(e), e + else: + raise AssertionError("deleted twice") + + # The last attribute simply leaves. + q = O() + del q.d + q.e = 9 + assert list(q.__dict__) == ["a", "b", "c", "e"] + assert not hasattr(q, "d") + + r = O() + del r.a + del r.b + del r.c + del r.d + assert r.__dict__ == {} + r.z = 1 + assert r.__dict__ == {"z": 1} + + # A fresh instance of the class keeps its fast layout. + s = O() + assert s.total() == 8 and list(vars(s)) == ["a", "b", "c", "d"] + + # The deleted value dies at the `del`. + o = O() + o.b = Fin() + del o.b + assert Fin.log == [1], Fin.log + o.c = Fin() + del o.a, o.c + assert Fin.log == [1, 1], Fin.log + assert vars(o) == {"d": 4} + + +run() +print("ok") diff --git a/tests/regrtest/test_split_dict_shared_deletions.py b/tests/regrtest/test_split_dict_shared_deletions.py new file mode 100644 index 00000000..728c8f74 --- /dev/null +++ b/tests/regrtest/test_split_dict_shared_deletions.py @@ -0,0 +1,96 @@ +"""Deleting an attribute from an instance with a split `__dict__` lays the +remaining values out over a table of their names. Instances that delete +the same attributes in the same order share those tables (see +`SharedKeys::without` in the VM), so each case checks that one instance's +later stores and deletions never show through another's `__dict__`, +attribute reads, or iteration order, in loops long enough to compile. +""" + +import unittest + +WARM = 2000 + + +class Box: + def __init__(self, a, b, c, d): + self.a = a + self.b = b + self.c = c + self.d = d + + +class SharedDeletionTests(unittest.TestCase): + def test_same_deletions_warm(self): + for i in range(WARM): + o = Box(i, 2, 3, 4) + del o.b, o.c + self.assertEqual(o.__dict__, {"a": i, "d": 4}) + self.assertEqual(o.a + o.d, i + 4) + self.assertFalse(hasattr(o, "b")) + self.assertFalse(hasattr(o, "c")) + + def test_store_after_shared_deletion(self): + first = Box(1, 2, 3, 4) + del first.b + first.z = 26 + second = Box(5, 6, 7, 8) + del second.b + self.assertEqual(list(second.__dict__), ["a", "c", "d"]) + self.assertFalse(hasattr(second, "z")) + second.w = 23 + self.assertEqual(list(second.__dict__), ["a", "c", "d", "w"]) + self.assertEqual(list(first.__dict__), ["a", "c", "d", "z"]) + self.assertEqual(second.w, 23) + self.assertFalse(hasattr(first, "w")) + third = Box(9, 10, 11, 12) + del third.b + third.z = 0 + self.assertEqual(third.__dict__, {"a": 9, "c": 11, "d": 12, "z": 0}) + self.assertEqual(first.z, 26) + + def test_different_orders(self): + for i in range(WARM): + o = Box(1, 2, 3, 4) + p = Box(5, 6, 7, 8) + del o.a, o.c + del p.c, p.a + self.assertEqual(o.__dict__, {"b": 2, "d": 4}) + self.assertEqual(p.__dict__, {"b": 6, "d": 8}) + del o.d + self.assertEqual(o.__dict__, {"b": 2}) + self.assertEqual(p.__dict__, {"b": 6, "d": 8}) + p.a = i + self.assertEqual(list(p.__dict__), ["b", "d", "a"]) + self.assertFalse(hasattr(o, "a")) + + def test_delete_then_readd(self): + for i in range(WARM): + o = Box(1, 2, 3, 4) + del o.a + o.a = i + self.assertEqual(list(o.__dict__), ["b", "c", "d", "a"]) + self.assertEqual(o.a, i) + del o.c + self.assertEqual(list(o.__dict__), ["b", "d", "a"]) + + def test_many_patterns(self): + names = "abcd" + for i in range(WARM): + o = Box(1, 2, 3, 4) + k = names[i % 3] + delattr(o, k) + expected = {n: v for n, v in zip(names, (1, 2, 3, 4)) if n != k} + self.assertEqual(o.__dict__, expected) + vars(o)["e"] = 5 + self.assertEqual(o.e, 5) + + def test_missing_attribute(self): + o = Box(1, 2, 3, 4) + del o.b + with self.assertRaises(AttributeError): + del o.b + self.assertEqual(o.__dict__, {"a": 1, "c": 3, "d": 4}) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_store_only_init.py b/tests/regrtest/test_store_only_init.py new file mode 100644 index 00000000..8625ce2e --- /dev/null +++ b/tests/regrtest/test_store_only_init.py @@ -0,0 +1,127 @@ +# A class whose `__init__` only stores its parameters (or constants) into +# `self` constructs by those stores alone once its store sites have +# proven them plain `__dict__` stores. Every way the class or the function +# can change under that shortcut must still be honored. + +import gc +import weakref + +N = 300 + + +class V: + def __init__(self, x, y, z=7): + self.x = x + self.y = y + self.z = z + self.k = 5 + self.label = "v" + self.me = self + self.again = x + + +def build(n): + return [V(i, -i) for i in range(n)] + + +for v in build(N)[-3:]: + assert v.me is v + assert v.z == 7 and v.k == 5 and v.label == "v" and v.again == v.x + assert list(vars(v)) == ["x", "y", "z", "k", "label", "me", "again"], vars(v) + +# A default given explicitly, and the argument stored twice. +for i in range(N): + v = V([i], 2, z=None) if i % 2 else V([i], 2, None) + assert v.z is None and v.x is v.again and v.x == [i] + +# Arity errors still raise from the call. +for args in [(), (1,), (1, 2, 3, 4)]: + try: + V(*args) + except TypeError as e: + assert "argument" in str(e), e + else: + raise AssertionError(args) + +# A property installed later on the class intercepts the store. +seen = [] + + +def set_y(self, value): + seen.append(value) + self.__dict__["_y"] = value + + +build(N) +V.y = property(lambda self: self.__dict__["_y"], set_y) +v = V(1, "yy") +assert seen == ["yy"] and v.y == "yy" and "y" not in vars(v) +del V.y +for v in build(N)[-2:]: + assert "y" in vars(v) + +# A `__setattr__` added later sees every store. +calls = [] + + +def tracing_setattr(self, name, value): + calls.append(name) + object.__setattr__(self, name, value) + + +V.__setattr__ = tracing_setattr +V(1, 2) +assert calls == ["x", "y", "z", "k", "label", "me", "again"], calls +del V.__setattr__ +calls.clear() +build(N) +assert calls == [] + + +# A subclass sharing the base's `__init__`, built in alternation. +class W(V): + pass + + +for i in range(N): + a, b = V(i, 0), W(i, 1) + assert type(a) is V and type(b) is W and b.me is b and b.y == 1 + +# Replacing `__init__`'s code or its defaults takes effect at once. +build(N) + + +def other(self, x, y, z=7): + self.x = -x + + +V.__init__.__code__ = other.__code__ +v = V(3, 4) +assert vars(v) == {"x": -3}, vars(v) + + +class D: + def __init__(self, a, b=1): + self.a = a + self.b = b + + +for i in range(N): + assert D(i).b == 1 +D.__init__.__defaults__ = (99,) +assert D(0).b == 99 + +# Instances still die by reference count, and the class with its last. +for _ in range(2): + class T: + def __init__(self, a): + self.a = a + + for i in range(N): + T(i) + r = weakref.ref(T) + del T + gc.collect() + assert r() is None + +print("test_store_only_init: OK") diff --git a/tests/regrtest/test_struct_native_methods.py b/tests/regrtest/test_struct_native_methods.py new file mode 100644 index 00000000..50b78bd6 --- /dev/null +++ b/tests/regrtest/test_struct_native_methods.py @@ -0,0 +1,59 @@ +"""`struct.Struct.pack`/`unpack` served natively keep the class's rules. + +The exact class's methods pack plain values and unpack `bytes` without +running the Python methods, which remain the fallback: subclasses, +`__index__` values, non-`bytes` buffers, an uninitialized or +re-initialized `Struct`, and every error must answer as they do. +""" + +import struct +import unittest + + +class StructNativeTest(unittest.TestCase): + def test_round_trip(self): + s = struct.Struct("h") + self.assertEqual(s.pack(1), b"\x00\x01") + self.assertEqual(s.unpack(b"\x00\x01"), (1,)) + self.assertEqual(s.format, ">h") + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_sum_instance_generator.py b/tests/regrtest/test_sum_instance_generator.py new file mode 100644 index 00000000..a71c1ced --- /dev/null +++ b/tests/regrtest/test_sum_instance_generator.py @@ -0,0 +1,112 @@ +"""`sum(obj)` where `iter(obj)` is a generator (a class whose `__iter__` is +a generator function, such as a tree walked with `yield from`) drains the +generator the way `sum(generator)` does, folding the yields it can in +place (see `do_sum_call` in the VM). Each case checks what plain +iteration gives: the total, `start`, mixed and float items, a raise +partway, PEP 479, and that `__iter__` runs exactly once. +""" + +import unittest + +WARM = 300 + + +class Tree: + __slots__ = ("left", "value", "right") + + def __init__(self, left, value, right): + self.left = left + self.value = value + self.right = right + + def __iter__(self): + if self.left: + yield from self.left + yield self.value + if self.right: + yield from self.right + + +def build(lo, hi): + if lo >= hi: + return None + mid = (lo + hi) // 2 + return Tree(build(lo, mid), mid, build(mid + 1, hi)) + + +class Items: + def __init__(self, items): + self.items = items + self.iters = 0 + + def __iter__(self): + self.iters += 1 + for x in self.items: + yield x + + +class Failing: + def __iter__(self): + yield 1 + yield 2 + raise KeyError("boom") + + +class LeakyStop: + def __iter__(self): + yield 1 + raise StopIteration + + +class Returning: + def __iter__(self): + yield 5 + return 99 + + +class SumInstanceGeneratorTests(unittest.TestCase): + def test_tree_warm(self): + tree = build(0, 256) + for _ in range(WARM): + self.assertEqual(sum(tree), sum(range(256))) + self.assertEqual(sum(tree, 1000), sum(range(256)) + 1000) + self.assertEqual(sum(tree, start=-1), sum(range(256)) - 1) + + def test_iter_called_once(self): + items = Items([1, 2, 3]) + self.assertEqual(sum(items), 6) + self.assertEqual(items.iters, 1) + + def test_mixed_items(self): + self.assertEqual(sum(Items([1, 2.5, True, 10**30])), 1 + 2.5 + 1 + 10**30) + self.assertEqual(sum(Items([0.1] * 10)), sum([0.1] * 10)) + self.assertEqual(sum(Items([[1], [2]]), []), [1, 2]) + with self.assertRaises(TypeError): + sum(Items([1, "a"])) + + def test_raise_partway(self): + with self.assertRaises(KeyError): + sum(Failing()) + + def test_pep479(self): + with self.assertRaises(RuntimeError) as cm: + sum(LeakyStop()) + self.assertIsInstance(cm.exception.__cause__, StopIteration) + + def test_return_value_ignored(self): + self.assertEqual(sum(Returning()), 5) + + def test_non_generator_iter(self): + class ListIter: + def __iter__(self): + return iter([4, 5, 6]) + + self.assertEqual(sum(ListIter()), 15) + + def test_empty(self): + self.assertEqual(sum(Items([])), 0) + self.assertEqual(sum(Items([]), 7), 7) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_super_dunder_and_metaclass.py b/tests/regrtest/test_super_dunder_and_metaclass.py new file mode 100644 index 00000000..47331937 --- /dev/null +++ b/tests/regrtest/test_super_dunder_and_metaclass.py @@ -0,0 +1,229 @@ +"""Zero-argument `super()` resolving dunders past built-in bases, and in +metaclass methods whose receiver is a class: the same attribute CPython +finds, bound the same way, through class changes after warm-up. + +(The module never names `super` at top level, which would make the +compiler use the generic `super()` call instead of `LOAD_SUPER_ATTR`.)""" + + +class D(dict): + def __setitem__(self, k, v): + super().__setitem__(k, v * 2) + + def __getitem__(self, k): + return super().__getitem__(k) + 1 + + def __len__(self): + return super().__len__() + 100 + + def __eq__(self, other): + return super().__eq__(other) + + def __repr__(self): + return "D" + super().__repr__() + + def __contains__(self, k): + return super().__contains__(k) + + +d = D() +for i in range(300): + d["k"] = i + assert d["k"] == 2 * i + 1 + assert len(d) == 101 + assert d == {"k": 2 * i} + assert repr(d) == "D{'k': %d}" % (2 * i) + assert "k" in d and "z" not in d + + +class L(list): + def __getitem__(self, i): + return super().__getitem__(i) * 10 + + def __iter__(self): + return super().__iter__() + + +lst = L([1, 2, 3]) +for _ in range(300): + assert lst[1] == 20 + assert list(iter(lst)) == [1, 2, 3] + + +# Dunders that only `object` provides. +class P: + def __init__(self): + super().__setattr__("x", 1) + + def __setattr__(self, k, v): + super().__setattr__(k, v + 1) + + def __getattribute__(self, k): + return super().__getattribute__(k) + + def __eq__(self, other): + return super().__eq__(other) + + def __hash__(self): + return super().__hash__() + + def __format__(self, spec): + return "P" + super().__format__("")[:0] + + +for _ in range(300): + p = P() + assert p.x == 1 + p.y = 5 + assert p.y == 6 + assert (p == p) is True and (p == 1) is False + assert p.__eq__(1) is NotImplemented + assert hash(p) == object.__hash__(p) + assert format(p, "") == "P" + + +# A user class between the subclass and the built-in base. +class Mid(dict): + def __setitem__(self, k, v): + super().__setitem__(k, ("mid", v)) + + +class Leaf(Mid): + def __setitem__(self, k, v): + super().__setitem__(k, ("leaf", v)) + + +lf = Leaf() +for i in range(300): + lf["a"] = i + assert dict.__getitem__(lf, "a") == ("mid", ("leaf", i)) + + +# Metaclass methods: `super()` with a class receiver. +log = [] + + +class Meta(type): + def __setattr__(cls, k, v): + log.append(("set", k)) + super().__setattr__(k, v) + + def __delattr__(cls, k): + log.append(("del", k)) + super().__delattr__(k) + + def __getattribute__(cls, k): + return super().__getattribute__(k) + + def describe(cls): + return super().__repr__() + + def __call__(cls, *args): + return super().__call__(*args) + + +class C(metaclass=Meta): + def __init__(self, a=0): + self.a = a + + +for i in range(300): + C.attr = i + assert C.attr == i + del C.attr + assert not hasattr(C, "attr") + assert C.describe().startswith("" + super().tag() + + +class T(metaclass=DerivedMeta): + pass + + +for _ in range(300): + assert T.tag() == "derived>base:T" + + +# Class methods and `__new__`: a class receiver that subclasses the +# `super()` class. +class Base: + @classmethod + def make(cls): + return ("base", cls.__name__) + + def __new__(cls, *args): + return super().__new__(cls) + + +class Sub(Base): + @classmethod + def make(cls): + return ("sub",) + super().make() + + def __new__(cls, *args): + return super().__new__(cls, *args) + + +for _ in range(300): + assert Sub.make() == ("sub", "base", "Sub") + assert type(Sub(1)) is Sub + + +# `super().__class__` is the proxy's. +class S: + def cls_of_super(self): + return super().__class__ + + +for _ in range(100): + assert S().cls_of_super().__name__ == "super" + + +# The resolution follows a class change made after warm-up. +class Base2(dict): + pass + + +class Child2(Base2): + def __setitem__(self, k, v): + super().__setitem__(k, v) + + +c2 = Child2() +for i in range(300): + c2["x"] = i +assert dict.__getitem__(c2, "x") == 299 + + +def base2_setitem(self, k, v): + dict.__setitem__(self, k, ("patched", v)) + + +Base2.__setitem__ = base2_setitem +for i in range(50): + c2["x"] = i + assert dict.__getitem__(c2, "x") == ("patched", i) +del Base2.__setitem__ +c2["x"] = 7 +assert dict.__getitem__(c2, "x") == 7 + +print("ok") diff --git a/tests/regrtest/test_super_proxy_attribute_sites.py b/tests/regrtest/test_super_proxy_attribute_sites.py new file mode 100644 index 00000000..d8cbb4e4 --- /dev/null +++ b/tests/regrtest/test_super_proxy_attribute_sites.py @@ -0,0 +1,70 @@ +"""Attribute loads on `super()` proxies resolve along the receiver's MRO +past the proxy's class at every execution, never along the `super` type's +own MRO, including names `object` also defines (`__new__`, `__init__`, +`__eq__`). This module names `super` at top level, so the compiler emits +the generic `super()` call and an ordinary `LOAD_ATTR` (as CPython does).""" + +the_super = super + + +class Base: + def __new__(cls, *args): + return the_super(Base, cls).__new__(cls) + + def __init__(self, *args): + self.args = args + + def __eq__(self, other): + return "Base.__eq__" + + def m(self): + return "Base.m" + + +class Sub(Base): + def __new__(cls, *args): + return super().__new__(cls, *args) + + def __init__(self, *args): + super().__init__(*args) + + def __eq__(self, other): + return super().__eq__(other) + + def m(self): + return super().m() + + +class Sub2(Base): + def __new__(cls, *args): + proxy = super() + return proxy.__new__(cls, *args) + + def __init__(self, *args): + proxy = super() + proxy.__init__(*args) + + +for i in range(300): + s = Sub(i) + assert type(s) is Sub and s.args == (i,) + assert (s == 1) == "Base.__eq__" + assert s.m() == "Base.m" + s2 = Sub2(i, i) + assert type(s2) is Sub2 and s2.args == (i, i) + + +# A `super` subclass as the proxy. +class MySuper(super): + pass + + +class Sub3(Base): + def __init__(self, *args): + MySuper(Sub3, self).__init__(*args) + + +for i in range(300): + assert Sub3(i).args == (i,) + +print("ok") diff --git a/tests/regrtest/test_tier2_caller_lineno.py b/tests/regrtest/test_tier2_caller_lineno.py new file mode 100644 index 00000000..2a5b1747 --- /dev/null +++ b/tests/regrtest/test_tier2_caller_lineno.py @@ -0,0 +1,26 @@ +# A caller's f_lineno, read through f_back while it runs a call, is the +# call's line on every call, including the one on which tier 2 first +# runs the caller natively (it used to report the caller's `def` line). + +import sys + + +def callee(): + f = sys._getframe() + return f.f_lineno, f.f_back.f_lineno + + +def caller(): + r = callee() + return r + + +def run(n=3000): + return [caller() for _ in range(n)] + + +res = run() +want = (10, 14) +bad = [(i, r) for i, r in enumerate(res) if r != want] +assert not bad, bad[:5] +print("test_tier2_caller_lineno: OK") diff --git a/tests/regrtest/test_warnings_stack_lean.py b/tests/regrtest/test_warnings_stack_lean.py new file mode 100644 index 00000000..4e63df9d --- /dev/null +++ b/tests/regrtest/test_warnings_stack_lean.py @@ -0,0 +1,77 @@ +"""warnings.warn attributes a warning to the right frame and line for each +stacklevel while its callers run lean or compiled (hot loops), filters +ignored warnings without side effects, and still builds the warning +object a custom category's constructor sees.""" + +import sys +import warnings + +with open(__file__) as _f: + _SRC = _f.read().splitlines() + + +def L(tag): + marker = "# " + tag + (line,) = [i + 1 for i, s in enumerate(_SRC) if s.endswith(marker)] + return line + + +def inner(level): + warnings.warn("w%d" % level, UserWarning, level) # in-warn + return 0 + + +def mid(level): + return inner(level) # mid-call + + +def outer(level): + return mid(level) # outer-call + + +def collect(n, level): + with warnings.catch_warnings(record=True) as got: + warnings.simplefilter("always") + for i in range(n): + outer(level) # collect-call + return {(w.filename == __file__, w.lineno, str(w.message)) for w in got} + + +made = [] + + +class Custom(UserWarning): + def __init__(self, *args): + made.append(args) + super().__init__(*args) + + +def ignored(n): + with warnings.catch_warnings(): + warnings.simplefilter("ignore") + for i in range(n): + warnings.warn("x", DeprecationWarning) + warnings.warn("y", Custom) + warnings.warn("z", UserWarning, stacklevel=2) + return len(made) + + +def run(n): + for level, tag in ((1, "in-warn"), (2, "mid-call"), (3, "outer-call"), (4, "collect-call")): + got = collect(n, level) + assert got == {(True, L(tag), "w%d" % level)}, (level, got) + made.clear() + assert ignored(n) == n + with warnings.catch_warnings(): + warnings.simplefilter("error") + try: + inner(1) + except UserWarning as e: + assert str(e) == "w1" and type(e) is UserWarning + else: + raise AssertionError("no error") + + +run(5) +run(3000) +run(3000) diff --git a/tests/regrtest/test_wide_store_init.py b/tests/regrtest/test_wide_store_init.py new file mode 100644 index 00000000..76b012ab --- /dev/null +++ b/tests/regrtest/test_wide_store_init.py @@ -0,0 +1,102 @@ +"""Store-only `__init__` bodies with many attributes. + +A constructor that only stores its parameters and constants into `self` +is run by its stores alone, up to as many attributes as a class shares +names for. Wide ones (more than sixteen stores), slotted ones and ones +past the limit must all build exactly the instance the body would. +""" + +import unittest + +NAMES = ["f%d" % i for i in range(34)] + + +def make_class(n, slots=False): + params = ", ".join("a%d" % i for i in range(min(n, 7))) + body = "\n".join( + " self.%s = %s" % (NAMES[i], "a%d" % (i % 7) if i % 3 else repr(i)) + for i in range(n) + ) + src = "class C:\n" + if slots: + src += " __slots__ = %r\n" % (tuple(NAMES[:n]),) + src += " def __init__(self, %s):\n%s\n" % (params, body) + ns = {} + exec(src, ns) + return ns["C"], min(n, 7) + + +def expected(n): + return {NAMES[i]: (i % 7 if i % 3 else i) for i in range(n)} + + +class WideInitTest(unittest.TestCase): + def check(self, n, slots): + cls, nparams = make_class(n, slots) + args = list(range(nparams)) + for _ in range(300): + obj = cls(*args) + if slots: + got = {name: getattr(obj, name) for name in NAMES[:n]} + self.assertFalse(hasattr(obj, "__dict__")) + else: + got = vars(obj) + self.assertEqual(list(got), NAMES[:n]) + self.assertEqual(got, expected(n)) + + def test_widths(self): + for n in (1, 15, 16, 17, 20, 29, 30, 31, 33): + for slots in (False, True): + with self.subTest(n=n, slots=slots): + self.check(n, slots) + + def test_tracked_values_and_cycles(self): + import gc + import weakref + + class Node: + def __init__(self, other, tag, items): + self.other = other + self.tag = tag + self.items = items + + refs = [] + for i in range(500): + a = Node(None, i, [i]) + b = Node(a, i, [a]) + a.other = b + refs.append(weakref.ref(a)) + del a, b + gc.collect() + self.assertTrue(all(r() is None for r in refs)) + n = Node(None, 1, []) + m = Node(n, 2, [n]) + self.assertIs(m.other, n) + self.assertIs(m.items[0], n) + + def test_reused_instance_with_published_dict(self): + cls, nparams = make_class(5) + for i in range(2000): + a = cls(*range(nparams)) + # A published `__dict__`, kept (emptied) by a pooled instance. + self.assertEqual(vars(a), expected(5)) + del a + b = cls(*range(nparams)) + self.assertEqual(vars(b), expected(5)) + self.assertEqual(b.f0, 0) + + def test_class_change_between_calls(self): + cls, nparams = make_class(20) + for _ in range(300): + obj = cls(*range(nparams)) + cls.f3 = property(lambda self: "prop", lambda self, v: None) + obj = cls(*range(nparams)) + self.assertEqual(obj.f3, "prop") + self.assertNotIn("f3", vars(obj)) + del cls.f3 + obj = cls(*range(nparams)) + self.assertEqual(obj.f3, 3) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_with_exit_inline.py b/tests/regrtest/test_with_exit_inline.py new file mode 100644 index 00000000..09154392 --- /dev/null +++ b/tests/regrtest/test_with_exit_inline.py @@ -0,0 +1,252 @@ +"""A `with` block's exit on an exception: when the manager's `__exit__` is a +plain Python function (not a frameless leaf), `WITH_EXCEPT_START` runs it as +an inline activation, as a `CALL` of the same operands would (see +`core_with_exit_inline` in the VM), instead of nesting the call. + +Each case runs warm (loops long enough to compile the callers) and checks +what the nested call did: the arguments, the handled exception, the +caller's frame, suppression and re-raising, raises out of `__exit__` with +their context and traceback, and finalizer timing. +""" + +import sys +import traceback +import unittest + +WARM = 3000 + + +class Recorder: + """An `__exit__` too large to be a frameless leaf.""" + + def __init__(self, suppress): + self.suppress = suppress + self.seen = [] + + def __enter__(self): + return self + + def __exit__(self, exctype, excinst, exctb): + if exctype is None: + return None + self.seen.append((exctype, excinst, exctb is excinst.__traceback__)) + if issubclass(exctype, BaseExceptionGroup): + match, rest = excinst.split(KeyError) + if rest is None: + return True + raise rest + return self.suppress + + +class Varargs: + def __enter__(self): + return self + + def __exit__(self, *args): + self.args = args + try: + pass + finally: + self.done = True + return True + + +class Inspector: + def __enter__(self): + return self + + def __exit__(self, exctype, excinst, exctb): + caller = sys._getframe(1) + self.line = caller.f_lineno + self.name = caller.f_code.co_name + self.info = sys.exc_info()[1] + for _ in (): + raise + return True + + +class Raiser: + def __enter__(self): + return self + + def __exit__(self, exctype, excinst, exctb): + if exctype is not None: + raise ValueError("from exit") from None + return False + + +class Chained: + def __enter__(self): + return self + + def __exit__(self, exctype, excinst, exctb): + if exctype is not None: + raise ValueError("from exit") + return False + + +class Mortal: + log = [] + + def __del__(self): + Mortal.log.append("del") + + +class Holder: + def __enter__(self): + return self + + def __exit__(self, exctype, excinst, exctb): + self.held = excinst + for _ in (): + raise + return True + + +class WithExitInlineTests(unittest.TestCase): + def test_suppress_warm(self): + r = Recorder(True) + d = {} + for i in range(WARM): + with r: + d[i] + self.assertEqual(len(r.seen), WARM) + t, e, same_tb = r.seen[-1] + self.assertIs(t, KeyError) + self.assertIsInstance(e, KeyError) + self.assertEqual(e.args, (WARM - 1,)) + self.assertTrue(same_tb) + + def test_reraise_warm(self): + r = Recorder(False) + caught = 0 + for i in range(WARM): + try: + with r: + raise IndexError(i) + except IndexError as e: + self.assertEqual(e.args, (i,)) + caught += 1 + self.assertEqual(caught, WARM) + + def test_reraise_keeps_traceback(self): + r = Recorder(False) + + def body(): + with r: + raise IndexError("deep") + + for _ in range(WARM): + try: + body() + except IndexError as e: + tb = e.__traceback__ + names = [f.name for f in traceback.extract_tb(tb)] + self.assertEqual(names[-1], "body") + self.assertIn("raise IndexError", traceback.format_tb(tb)[-1]) + + def test_group_split(self): + r = Recorder(False) + for _ in range(WARM): + with r: + raise ExceptionGroup("g", [KeyError(1)]) + with self.assertRaises(ExceptionGroup) as cm: + with r: + raise ExceptionGroup("g", [KeyError(1), ValueError(2)]) + self.assertEqual(len(cm.exception.exceptions), 1) + self.assertIsInstance(cm.exception.exceptions[0], ValueError) + + def test_varargs_exit(self): + v = Varargs() + for i in range(WARM): + with v: + raise KeyError(i) + self.assertEqual(len(v.args), 3) + self.assertIs(v.args[0], KeyError) + self.assertEqual(v.args[1].args, (WARM - 1,)) + self.assertIs(v.args[2], v.args[1].__traceback__) + self.assertTrue(v.done) + + def test_caller_frame_and_exc_info(self): + insp = Inspector() + for i in range(WARM): + with insp: + expected = sys._getframe().f_lineno - 1 + raise KeyError(i) + self.assertEqual(insp.line, expected) + self.assertEqual(insp.name, "test_caller_frame_and_exc_info") + self.assertIsInstance(insp.info, KeyError) + self.assertEqual(insp.info.args, (WARM - 1,)) + self.assertIsNone(sys.exc_info()[1]) + + def test_raise_from_exit_chains_context(self): + c = Chained() + for i in range(WARM): + try: + with c: + raise KeyError(i) + except ValueError as e: + err = e + self.assertEqual(err.args, ("from exit",)) + self.assertIsInstance(err.__context__, KeyError) + self.assertEqual(err.__context__.args, (WARM - 1,)) + names = [f.name for f in traceback.extract_tb(err.__traceback__)] + self.assertEqual(names[-1], "__exit__") + self.assertIn("test_raise_from_exit_chains_context", names) + + def test_raise_from_exit_inside_handler(self): + c = Raiser() + hits = 0 + for i in range(WARM): + try: + with c: + raise KeyError(i) + except ValueError: + hits += 1 + self.assertEqual(hits, WARM) + self.assertIsNone(sys.exc_info()[1]) + + def test_exception_released_promptly(self): + h = Holder() + for _ in range(WARM): + with h: + raise KeyError(Mortal()) + Mortal.log.clear() + h.held = None + self.assertEqual(Mortal.log, ["del"]) + + def test_nested_withs(self): + outer = Recorder(True) + inner = Recorder(False) + for i in range(WARM): + with outer: + with inner: + raise LookupError(i) + self.assertEqual(len(inner.seen), WARM) + self.assertEqual(len(outer.seen), WARM) + self.assertIs(inner.seen[-1][1], outer.seen[-1][1]) + + def test_recursion_limit(self): + r = Recorder(True) + + def deep(n): + with r: + if n: + deep(n - 1) + raise KeyError(n) + + old = sys.getrecursionlimit() + try: + sys.setrecursionlimit(200) + for _ in range(50): + try: + deep(1000) + except RecursionError: + pass + finally: + sys.setrecursionlimit(old) + deep(5) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_yield_from_fast_steps.py b/tests/regrtest/test_yield_from_fast_steps.py new file mode 100644 index 00000000..602de0b0 --- /dev/null +++ b/tests/regrtest/test_yield_from_fast_steps.py @@ -0,0 +1,228 @@ +"""`yield from` and `await` of simple generators stepped in place. + +A `SEND` to a simple generator, or the resume of a collapsed chain whose +innermost generator is a simple one, may run that generator's body to its +next yield without an activation: the value passes every level by, and a +return lands in the innermost level's `SEND`. Values, return values, +`StopIteration`, the levels' state and frames, and every consumer +(`for`, `next()`, `send(None)`, `sum()`, coroutine drivers, asyncio) must +see exactly what resuming each level in turn shows. +""" + +import asyncio +import inspect +import types +import unittest + +N = 40 + + +def counting(n): + for i in range(n): + yield i + return n + + +def relay(depth, n, log=None): + if depth == 0: + got = yield from counting(n) + else: + got = yield from relay(depth - 1, n, log) + if log is not None: + log.append((depth, got)) + return got + 1 + + +def twice(n): + a = yield from counting(n) + b = yield from counting(n) + return a + b + + +class YieldFromFastStepsTest(unittest.TestCase): + def test_values_and_returns(self): + for depth in (0, 1, 3, 12): + log = [] + g = relay(depth, N, log) + self.assertEqual(list(g), list(range(N))) + self.assertEqual(log, [(d, N + d) for d in range(depth + 1)]) + + def test_return_value_reaches_consumer(self): + for depth in (0, 2, 6): + g = relay(depth, 3) + self.assertEqual([next(g), next(g), next(g)], [0, 1, 2]) + with self.assertRaises(StopIteration) as cm: + next(g) + self.assertEqual(cm.exception.value, 3 + depth + 1) + + def test_sequential_delegations(self): + def outer(): + total = yield from twice(5) + yield ("total", total) + + for _ in range(50): + self.assertEqual(list(outer()), list(range(5)) * 2 + [("total", 10)]) + + def test_consumers(self): + for depth in (1, 4): + self.assertEqual(sum(relay(depth, N)), sum(range(N))) + g = relay(depth, N) + self.assertEqual([next(g, None) for _ in range(N + 2)], list(range(N)) + [None, None]) + g = relay(depth, N) + out = [] + try: + while True: + out.append(g.send(None)) + except StopIteration as e: + self.assertEqual(e.value, N + depth + 1) + self.assertEqual(out, list(range(N))) + + def test_send_values_mixed(self): + def echo(): + got = None + for _ in range(N): + got = yield got + return "done" + + def wrap(depth): + if depth == 0: + return (yield from echo()) + return (yield from wrap(depth - 1)) + + g = wrap(4) + self.assertIsNone(next(g)) + seen = [] + for i in range(N - 1): + seen.append(g.send(i if i % 3 else None)) + self.assertEqual(seen, [i if i % 3 else None for i in range(N - 1)]) + with self.assertRaises(StopIteration) as cm: + g.send(None) + self.assertEqual(cm.exception.value, "done") + + def test_levels_between_items(self): + gens = [] + + def level(depth): + if depth == 0: + inner = counting(N) + else: + inner = level(depth - 1) + gens.append(inner) + yield from inner + + top = level(4) + for _ in range(5): + next(top) + self.assertEqual(len(gens), 5) + for g in [top] + gens[:-1]: + self.assertTrue(g.gi_suspended) + self.assertIsNotNone(g.gi_yieldfrom) + self.assertEqual(g.gi_frame.f_code.co_name, "level") + inner = gens[-1] + self.assertEqual(inner.gi_frame.f_locals["i"], 4) + self.assertEqual(next(top), 5) + self.assertEqual(next(inner), 6) + self.assertEqual(list(top), list(range(7, N))) + + def test_close_and_throw_reach_the_simple_generator(self): + log = [] + + def guarded(n): + try: + for i in range(n): + yield i + finally: + log.append("closed") + + def wrap(depth): + if depth == 0: + yield from guarded(N) + else: + yield from wrap(depth - 1) + + g = wrap(3) + self.assertEqual([next(g) for _ in range(4)], [0, 1, 2, 3]) + g.close() + self.assertEqual(log, ["closed"]) + g = wrap(3) + next(g) + with self.assertRaises(KeyError): + g.throw(KeyError) + self.assertEqual(log, ["closed", "closed"]) + + def test_await_simple_awaitables(self): + class Tick: + def __await__(self): + got = yield "tick" + return got + + async def ticking(n): + total = 0 + for i in range(n): + total += await Tick() or 0 + return total + + async def wrap(depth, n): + if depth == 0: + return await ticking(n) + return await wrap(depth - 1, n) + + for depth in (0, 3): + coro = wrap(depth, N) + sent = [] + value = coro.send(None) + try: + k = 0 + while True: + sent.append(value) + k += 1 + value = coro.send(None if k % 2 else k) + except StopIteration as e: + result = e.value + self.assertEqual(sent, ["tick"] * N) + self.assertEqual(result, sum(k for k in range(1, N + 1) if k % 2 == 0)) + + def test_types_coroutine_chain(self): + @types.coroutine + def step(): + yield + + async def inner(n): + for _ in range(n): + await step() + return n + + async def outer(n): + return await inner(n) + 1 + + coro = outer(N) + count = 0 + try: + while True: + self.assertIsNone(coro.send(None)) + count += 1 + if count == N // 2: + self.assertEqual(inspect.getcoroutinestate(coro), inspect.CORO_SUSPENDED) + self.assertIsNotNone(coro.cr_await) + except StopIteration as e: + self.assertEqual(e.value, N + 1) + self.assertEqual(count, N) + + def test_asyncio_sleep_zero(self): + async def worker(k, log): + for i in range(10): + await asyncio.sleep(0) + log.append((k, i)) + + async def main(): + log = [] + await asyncio.gather(*(worker(k, log) for k in range(3))) + return log + + log = asyncio.run(main()) + self.assertEqual(sorted(log), [(k, i) for k in range(3) for i in range(10)]) + self.assertEqual([i for k, i in log if k == 0], list(range(10))) + + +if __name__ == "__main__": + unittest.main() diff --git a/tests/regrtest/test_yield_from_parked_chains.py b/tests/regrtest/test_yield_from_parked_chains.py new file mode 100644 index 00000000..e490e171 --- /dev/null +++ b/tests/regrtest/test_yield_from_parked_chains.py @@ -0,0 +1,466 @@ +"""Observing and changing the levels of a `yield from` chain between items. + +Once a chain has passed a value up, its levels may stay collapsed: the next +resume of the outermost level runs the innermost generator directly again. +Anything that reaches an intermediate level in between (its state, frame, +locals, `send`, `throw`, `close`, its release, a tracer) must find it just +as resuming the chain level by level leaves it: suspended in its +`yield from`, with every later item, exception and finalizer unchanged. +""" + +import asyncio +import gc +import inspect +import sys +import traceback +import types +import unittest + +N = 50 + + +def leaf(n, log=None): + try: + for i in range(n): + yield i + finally: + if log is not None: + log.append("leaf") + + +def level(depth, n, log=None, gens=None): + try: + if depth == 0: + inner = leaf(n, log) + else: + inner = level(depth - 1, n, log, gens) + if gens is not None: + gens.append(inner) + result = yield from inner + return result + finally: + if log is not None: + log.append(depth) + + +def started(depth, n=N, items=3, log=None): + """A chain `depth + 1` levels deep, `items` items in, with its levels + outermost first (the innermost generator last).""" + gens = [] + top = level(depth, n, log, gens) + for i in range(items): + assert next(top) == i + return top, [top] + gens + + +class ParkedChainTest(unittest.TestCase): + def test_levels_suspended(self): + top, gens = started(5) + for g in gens: + self.assertFalse(g.gi_running) + self.assertTrue(g.gi_suspended) + self.assertEqual(inspect.getgeneratorstate(g), inspect.GEN_SUSPENDED) + for outer, inner in zip(gens, gens[1:]): + self.assertIs(outer.gi_yieldfrom, inner) + self.assertIsNone(gens[-1].gi_yieldfrom) + self.assertEqual(list(top), list(range(3, N))) + + def test_frames_between_items(self): + top, gens = started(5) + line = level.__code__.co_firstlineno + 8 + for g in gens[:-1]: + frame = g.gi_frame + self.assertEqual(frame.f_code.co_name, "level") + self.assertEqual(frame.f_lineno, line) + self.assertIsNone(frame.f_back) + frames = [g.gi_frame for g in gens[:-1]] + self.assertEqual(len({f.f_lasti for f in frames}), 1) + self.assertEqual(next(top), 3) + # Still the same frames, on the same line. + self.assertEqual([g.gi_frame for g in gens[:-1]], frames) + self.assertEqual({f.f_lineno for f in frames}, {line}) + self.assertEqual(list(top), list(range(4, N))) + + def test_locals_of_a_level(self): + top, gens = started(4) + mid = gens[2] + self.assertEqual(mid.gi_frame.f_locals["depth"], 2) + self.assertIs(mid.gi_frame.f_locals["inner"], gens[3]) + self.assertEqual(next(top), 3) + self.assertEqual(mid.gi_frame.f_locals["depth"], 2) + self.assertEqual(list(top), list(range(4, N))) + + def test_next_on_a_level(self): + top, gens = started(5) + mid = gens[3] + self.assertEqual(next(mid), 3) + self.assertEqual(next(mid), 4) + self.assertEqual(next(top), 5) + self.assertEqual(next(gens[1]), 6) + self.assertEqual(next(top), 7) + self.assertEqual(list(top), list(range(8, N))) + + def test_next_on_the_innermost(self): + top, gens = started(5) + self.assertEqual(next(gens[-1]), 3) + self.assertEqual(next(top), 4) + self.assertEqual(next(gens[-1]), 5) + self.assertEqual(list(top), list(range(6, N))) + + def test_send_to_a_level(self): + def echo(): + got = None + while True: + got = yield got + + def wrap(g): + return (yield from g) + + inner = echo() + gens = [inner] + for _ in range(5): + gens.insert(0, wrap(gens[0])) + top = gens[0] + next(top) + for i in range(3): + self.assertEqual(top.send(i), i) + self.assertEqual(gens[2].send("mid"), "mid") + self.assertEqual(next(top), None) + self.assertEqual(top.send(7), 7) + self.assertEqual(gens[4].send(8), 8) + self.assertEqual(top.send(9), 9) + + def test_throw_into_a_level(self): + log = [] + top, gens = started(5, log=log) + with self.assertRaises(KeyError): + gens[3].throw(KeyError("x")) + # The leaf and two levels finished, innermost first. + self.assertEqual(log, ["leaf", 0, 1, 2]) + self.assertEqual(inspect.getgeneratorstate(gens[3]), inspect.GEN_CLOSED) + self.assertEqual(inspect.getgeneratorstate(gens[2]), inspect.GEN_SUSPENDED) + # The level above finds its finished delegate exhausted, and the + # rest of the chain finishes in turn. + with self.assertRaises(StopIteration): + next(top) + self.assertEqual(log, ["leaf", 0, 1, 2, 3, 4, 5]) + + def test_throw_caught_by_a_level(self): + def catching(g): + try: + yield from g + except KeyError: + yield "caught" + yield "after" + + inner = leaf(N) + mid = catching(inner) + top = catching(catching(mid)) + self.assertEqual([next(top) for _ in range(3)], [0, 1, 2]) + self.assertEqual(mid.throw(KeyError), "caught") + self.assertEqual(inspect.getgeneratorstate(inner), inspect.GEN_CLOSED) + self.assertEqual(next(top), "after") + self.assertEqual(next(top), "after") + self.assertEqual(next(top), "after") + with self.assertRaises(StopIteration): + next(top) + + def test_close_a_level(self): + log = [] + top, gens = started(5, log=log) + gens[3].close() + self.assertEqual(log, ["leaf", 0, 1, 2]) + # The level above finds its delegate exhausted (its return value + # `None`) and finishes in turn, as do the rest. + with self.assertRaises(StopIteration): + next(top) + self.assertEqual(log, ["leaf", 0, 1, 2, 3, 4, 5]) + + def test_close_the_top(self): + log = [] + top, gens = started(5, log=log) + top.close() + self.assertEqual(log, ["leaf", 0, 1, 2, 3, 4, 5]) + for g in gens: + self.assertEqual(inspect.getgeneratorstate(g), inspect.GEN_CLOSED) + + def test_release_runs_finalizers_at_once(self): + log = [] + top, gens = started(5, log=log) + del gens + self.assertEqual(log, []) + del top + self.assertEqual(log, ["leaf", 0, 1, 2, 3, 4, 5]) + + def test_release_of_a_shared_level(self): + log = [] + top, gens = started(5, log=log) + mid = gens[2] + del gens + del top + # The levels above `mid` finish at their `yield from`, which + # closes `mid`: everything finishes. + self.assertEqual(log, ["leaf", 0, 1, 2, 3, 4, 5]) + self.assertEqual(inspect.getgeneratorstate(mid), inspect.GEN_CLOSED) + + def test_collect_between_items(self): + top, gens = started(5) + gc.collect() + self.assertTrue(all(g.gi_suspended for g in gens)) + self.assertEqual(next(top), 3) + gc.collect() + self.assertEqual(list(top), list(range(4, N))) + + def test_cycle_through_a_level(self): + log = [] + top, gens = started(5, log=log) + holder = [] + holder.append(gens[2]) + # A cycle: the innermost level's local refers back to the chain. + gens[-1].gi_frame.f_locals # (a read only) + cycle = [top, holder] + holder.append(cycle) + del top, gens, holder, cycle + gc.collect() + self.assertEqual(log, ["leaf", 0, 1, 2, 3, 4, 5]) + + def test_raise_after_parking(self): + def failing(n): + for i in range(n): + yield i + raise ValueError("deep") + + def wrap(depth): + if depth == 0: + yield from failing(5) + else: + yield from wrap(depth - 1) + + g = wrap(4) + out = [] + try: + for x in g: + out.append(x) + except ValueError as e: + names = [f.name for f in traceback.extract_tb(e.__traceback__)] + else: + self.fail("no ValueError") + self.assertEqual(out, list(range(5))) + self.assertEqual(names, ["test_raise_after_parking"] + ["wrap"] * 5 + ["failing"]) + + def test_stop_iteration_values(self): + def counting(n): + for i in range(n): + yield i + return n + + def adding(depth, n): + if depth == 0: + got = yield from counting(n) + else: + got = yield from adding(depth - 1, n) + yield ("level", depth, got) + return got + 1 + + out = list(adding(4, 6)) + self.assertEqual(out[:6], list(range(6))) + self.assertEqual( + out[6:], + [("level", 0, 6), ("level", 1, 7), ("level", 2, 8), ("level", 3, 9), ("level", 4, 10)], + ) + + def test_two_consumers_share_a_chain(self): + def wrap(g): + yield from g + + shared = level(4, N) + a = wrap(shared) + b = wrap(shared) + got = [] + for _ in range(10): + got.append(next(a)) + got.append(next(b)) + self.assertEqual(got, list(range(20))) + self.assertEqual(list(a), list(range(20, N))) + self.assertEqual(list(b), []) + + def test_trace_after_parking(self): + top, gens = started(4) + events = [] + + def tracer(frame, event, arg): + if event in ("call", "return"): + events.append((event, frame.f_code.co_name)) + return tracer + + sys.settrace(tracer) + try: + value = next(top) + finally: + sys.settrace(None) + self.assertEqual(value, 3) + self.assertEqual( + events, + [("call", "level")] * 5 + + [("call", "leaf"), ("return", "leaf")] + + [("return", "level")] * 5, + ) + self.assertEqual(list(top), list(range(4, N))) + + def test_temporary_chain_from_next(self): + log = [] + for _ in range(20): + log.clear() + self.assertEqual(next(level(5, N, log)), 0) + # The chain's only owner was the call: released at once. + self.assertEqual(log, ["leaf", 0, 1, 2, 3, 4, 5]) + + def test_next_default_through_chain(self): + marker = object() + top = level(4, 3) + self.assertEqual([next(top, marker) for _ in range(5)], [0, 1, 2, marker, marker]) + + def test_for_loop_with_break(self): + top, gens = started(5, items=0) + seen = [] + for x in top: + seen.append(x) + if x == 4: + break + for g in gens: + self.assertFalse(g.gi_running) + self.assertEqual(inspect.getgeneratorstate(g), inspect.GEN_SUSPENDED) + self.assertEqual(top.gi_frame.f_locals["depth"], 5) + for x in top: + seen.append(x) + if x == 9: + break + self.assertEqual(seen, list(range(10))) + self.assertEqual(next(top), 10) + self.assertEqual(list(top), list(range(11, N))) + + def test_raise_through_for_loop(self): + def failing(n): + for i in range(n): + yield i + raise ValueError("deep") + + def wrap(depth): + if depth == 0: + yield from failing(30) + else: + yield from wrap(depth - 1) + + for _ in range(10): + out = [] + try: + for x in wrap(4): + out.append(x) + except ValueError as e: + names = [f.name for f in traceback.extract_tb(e.__traceback__)] + self.assertEqual(out, list(range(30))) + self.assertEqual(names, ["test_raise_through_for_loop"] + ["wrap"] * 5 + ["failing"]) + + def test_generator_expression_consumer(self): + top, gens = started(6) + self.assertEqual(sum(x for x in top if x % 2), sum(i for i in range(3, N) if i % 2)) + + def test_coroutine_chain_between_sends(self): + @types.coroutine + def tick(i): + return (yield i) + + async def leaf_coro(n): + total = 0 + for i in range(n): + total += await tick(i) + return total + + async def wrap(depth, n, coros): + if depth == 0: + inner = leaf_coro(n) + else: + inner = wrap(depth - 1, n, coros) + coros.append(inner) + return await inner + 1 + + coros = [] + coro = wrap(5, N, coros) + self.assertEqual(coro.send(None), 0) + self.assertEqual(coro.send(1), 1) + mid = coros[-3] + self.assertEqual(inspect.getcoroutinestate(mid), inspect.CORO_SUSPENDED) + self.assertIsNotNone(mid.cr_await) + self.assertEqual(mid.cr_frame.f_code.co_name, "wrap") + value = 2 + try: + while True: + value = coro.send(1) + except StopIteration as stop: + result = stop.value + self.assertEqual(value, N - 1) + self.assertEqual(result, N + 6) + + def test_asyncio_cancel_nested(self): + log = [] + + async def inner(): + try: + while True: + await asyncio.sleep(0) + finally: + log.append("inner") + + async def wrap(depth): + try: + if depth == 0: + await inner() + else: + await wrap(depth - 1) + finally: + log.append(depth) + + async def main(): + task = asyncio.ensure_future(wrap(5)) + for _ in range(20): + await asyncio.sleep(0) + task.cancel() + with self.assertRaises(asyncio.CancelledError): + await task + stack = [] + return stack + + asyncio.run(main()) + self.assertEqual(log, ["inner", 0, 1, 2, 3, 4, 5]) + + def test_asyncio_get_stack(self): + async def inner(ready): + ready.set_result(None) + await asyncio.sleep(3600) + + async def wrap(depth, ready): + if depth == 0: + await inner(ready) + else: + await wrap(depth - 1, ready) + + async def main(): + loop = asyncio.get_running_loop() + ready = loop.create_future() + task = asyncio.ensure_future(wrap(4, ready)) + await ready + for _ in range(5): + await asyncio.sleep(0) + names = [f.f_code.co_name for f in task.get_stack(limit=100)] + task.cancel() + try: + await task + except asyncio.CancelledError: + pass + return names + + self.assertEqual(asyncio.run(main())[:1], ["wrap"]) + + +if __name__ == "__main__": + unittest.main()