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Changelog

This document describes changes between tagged Binaryen versions.

To browse or download snapshots of old tagged versions, visit https://github.com/WebAssembly/binaryen/releases.

Not all changes are documented here. In particular, new features, user-oriented fixes, options, command-line parameters, usage changes, deprecations, significant internal modifications and optimizations etc. generally deserve a mention. To examine the full set of changes between versions, visit the link to full changeset diff at the end of each section.

Current Trunk

v99

  • RefFunc C and JS API constructors (BinaryenRefFunc and ref.func respectively) now take an extra type parameter, similar to RefNull. This is necessary for typed function references support.
  • JS API functions for atomic notify/wait instructions are renamed.
    • module.atomic.notify -> module.memory.atomic.notify
    • module.i32.atomic.wait -> module.memory.atomic.wait32
    • module.i64.atomic.wait -> module.memory.atomic.wait64
  • Remove old/broken SpollPointers pass. This pass: Spills values that might be pointers to the C stack. This allows Boehm-style GC to see them properly. This can be revived if needed from git history (#3261).
  • Make NUM_PARAMS in FuncCastEmulation a runtime configuration option named max-func-params. This defaults to the original value of 16.
  • BinaryenGetFunction, BinaryenGetGlobal and BinaryenGetEvent now return NULL instead of aborting when the respective element does not yet exist.

v98

  • Add --fast-math mode. (#3155)
  • Initial implementation of "Memory64" proposal (#3130)
  • Lots of changes in support of GC proposal

v97

  • Remove asm2wasm, which supported Emscripten's fastcomp backend, after fastcomp was removed.
  • The new feature flag --enable-anyref enables just the anyref type incl. basic subtyping of externref, funcref and exnref (if enabled).
  • Enabling the exception handling or anyref features without also enabling reference types is a validation error now.
  • The Host expression and its respective APIs have been refactored into separate MemorySize and MemoryGrow expressions to align with other memory instructions.

v96

  • Fuzzing: Compare wasm2js to the interpreter (#3026)
  • Fix CountLeadingZeroes on MSVC, which lead to bad optimizations (#3028)
  • Asyncify verbose option (#3022)
  • wasm2js: Add an "Export" scope for name resolution, avoids annoying warnings (#2998)
  • Extend the C- and JS-APIs (#2586)

v95

  • Add Asyncify "add list" that adds to the list of functions to be instrumented. Rename old lists to be clearer and more consistent with that, so now there is "remove list" to remove, "add list" to add, and "only list" which if set means that only those functions should be instrumented and nothing else.
  • Renamed various ambiguous C-API functions for consistency:
    • BinaryenBlockGetChild to BinaryenBlockGetChildAt
    • BinaryenSwitchGetName to BinaryenSwitchGetNameAt
    • BinaryenCallGetOperand to BinaryenCallGetOperandAt
    • BinaryenCallIndirectGetOperand to BinaryenCallIndirectGetOperandAt
    • BinaryenHostGetOperand to BinaryenHostGetOperandAt
    • BinaryenThrowGetOperand to BinaryenThrowGetOperandAt
    • BinaryenTupleMakeGetOperand to BinaryenTupleMakeGetOperandAt

v94

  • The C-API's BinaryenSetAPITracing and the JS-API's setAPITracing have been removed because this feature was not very useful anymore and had a significant maintainance cost.
  • wasm-emscripten-finalize will no longer generate stackSave, stackAlloc, stackRestore function. It not expects them to be included in the input file.

v93

  • First release with binaries built with github actions.

v92

  • The multivalue feature has been added. It allows functions and control flow structures to return tuples and for locals and globals to have tuple types. Tuples are created with the new tuple.make pseudoinstruction and their elements are retrieved with the new tuple.extract pseudoinstruction.
  • The internal type interner has been rewritten to avoid taking locks in far more situations. Depending on the workload, this may result in large speedups and increased parallelism.
  • Represent the dylink section in Binaryen IR, so we can read, write, and update it.

v91

  • BinaryenExpressionGetSideEffects (C API) and getSideEffects (JS API) now takes an additional features parameter.
  • Reference type support is added. Supported instructions are ref.null, ref.is_null, ref.func, and typed select. Table instructions are not supported yet. For typed select, C/JS API can take an additional 'type' parameter.

v90

  • local.tee's C/Binaryen.js API now takes an additional type parameter for its local type, like local.get. This is required to handle subtypes.
  • Added load_splat SIMD instructions
  • Binaryen.js instruction API changes:
    • notify -> atomic.notify
    • i32.wait / i64.wait -> i32.atomic.wait / i64.atomic.wait
  • Binaryen.js: flags argument in setMemory function is removed.
  • atomic.fence instruction support is added.
  • wasm-emscripten-finalize: Don't rely on name section being present in the input. Use the exported names for things instead.
  • Added mutable parameter to BinaryenAddGlobalImport.
  • Replace BinaryenSIMDBitselect* with BinaryenSIMDTernary* in the C API and add qfma/qfms instructions.
  • Added offset parameter to BinaryenSetFunctionTable.
  • Add the ability to create multivalue Types in the C and JS APIs.
  • Remove named function types. They are replaced by params and results types local to each function.
  • Binaryen.js can now be compiled to Wasm using the binaryen_wasm target. Unlike the JS variant, the Wasm variant requires asynchronously awaiting the Wasm blob's instantiation and initialization before being usable, using the binaryen.ready promise, e.g. binaryen.ready.then(() => ...).
  • Binaryen.js now uses binaryen (was Binaryen) as its global name to align with the npm package.
  • Binaryen.js: The result of getMemorySegmentInfoByIndex now has the same structure as the respective inputs on creation (byteOffset -> offset).

v88

  • wasm-emscripten-finalize: For -pie binaries that import a mutable stack pointer we internalize this an import it as immutable.
  • The tail-call feature including the return_call and return_call_indirect instructions is ready to use.

v87

  • Rename Bysyncify => Asyncify

v86

  • The --initial-stack-pointer argument to wasm-emscripten-finalize no longer has any effect. It will be removed completely in future release.

v85

  • Wast file parsing rules now don't allow a few invalid formats for typeuses that were previously allowed. Typeuse entries should follow this format, meaning they should have (type) -> (param) -> (result) order if more than one of them exist. 
    typeuse ::= (type index|name)+ |
            (type index|name)+ (param ..)* (result ..)* |
            (param ..)* (result ..)*
    Also, all (local) nodes in function definition should be after all typeuse elements.
  • Removed APIs related to deprecated instruction names in Binaryen.js:
    • get_local / getLocal
    • set_local / setLocal
    • tee_local / teeLocal
    • get_global / getGlobal
    • set_global / setGlobal
    • current_memory / currentMemory
    • grow_memory / growMemory They are now available as their new instruction names: local.get, local.set, local.tee, global.get, global.set, memory.size, and memory.grow.
  • Add feature handling to the C/JS API with no feature enabled by default.

v84

  • Generate dynCall thunks for any signatures used in "invoke" calls.

v81

  • Fix AsmConstWalker handling of string address in arg0 with -fPIC code

v80

  • Change default feature set in the absence of a target features section from all features to MVP.

v79

  • Improve support for side modules

v78

  • Add namedGlobals to metadata output of wasm-emscripten-finalize
  • Add support for llvm PIC code.
  • Add --side-module option to wasm-emscripten-finalize.
  • Add segmentPassive argument to BinaryenSetMemory for marking segments passive.
  • Make -o - print to stdout instead of a file named "-".

v73

  • Remove wasm-merge tool.

v73

v55

  • RelooperCreate in the C API now has a Module parameter, and RelooperRenderAndDispose does not.
    • The JS API now has the Relooper constructor receive the Module.
  • Relooper: Condition properties on Branches must not have side effects.

older

  • BinaryenSetFunctionTable in the C API no longer accepts an array of functions, instead it accepts an array of function names, const char** funcNames. Previously, you could not include imported functions because they are of type BinaryenImportRef instead of BinaryenFunctionRef. #1650

  • BinaryenSetFunctionTable in the C API now expects the initial and maximum table size as additional parameters, like BinaryenSetMemory does for pages, so tables can be grown dynamically. #1687

  • Add shared parameters to BinaryenAddMemoryImport and BinaryenSetMemory, to support a shared memory. #1686