Add back KINDA_DUMP_STACK_TRACE

.github/workflows/elixir.yml

@@ -67,16 +67,31 @@ jobs:
         run: |
           zig fmt --check src
           zig fmt --check kinda_example/native/zig-src
-      - name: Run tests (example with gdb)
-        working-directory: ./kinda_example
+      - name: Install gdb
         run: |
           sudo apt update
           sudo apt install -y gdb
+      - name: Run tests (example with gdb and stack trace)
+        working-directory: ./kinda_example
+        run: |
+          bash ../scripts/gdb.sh test
+        env:
+          KINDA_DUMP_STACK_TRACE: "1"
+      - name: Run tests (example with gdb)
+        working-directory: ./kinda_example
+        run: |
           bash ../scripts/gdb.sh test
       - name: Run tests (example)
         working-directory: ./kinda_example
         run: |
           mix test --force
+      - name: Run tests (example with stack trace)
+        continue-on-error: true
+        working-directory: ./kinda_example
+        run: |
+          mix test --force
+        env:
+          KINDA_DUMP_STACK_TRACE: "1"
       - name: Precompile
         working-directory: ./kinda_example
         env:

src/result.zig

@@ -2,11 +2,20 @@ const beam = @import("beam");
 const e = @import("erl_nif").c;
 const std = @import("std");
 
+pub fn is_stack_trace_enabled() bool {
+    var value: [256]u8 = undefined;
+    var value_size: usize = value.len;
+    return e.enif_getenv("KINDA_DUMP_STACK_TRACE", &value[0], &value_size) == 0;
+}
+
 pub fn nif_with_flags(comptime name: [*c]const u8, comptime arity: usize, comptime f: anytype, comptime flags: u32) type {
     const ns = "Elixir.";
     return struct {
         fn exported(env: beam.env, n: c_int, args: [*c]const beam.term) callconv(.c) beam.term {
             return f(env, n, args) catch |err| {
+                if (is_stack_trace_enabled()) {
+                    std.debug.dumpStackTrace(@errorReturnTrace().?.*);
+                }
                 return beam.raise_exception(env, ns ++ "Kinda.CallError", err);
             };
         }