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[Wasm] Add missing return buffer argument in wasm import thunks #128104

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Merged
kg merged 4 commits into from
May 14, 2026
+13 −0
Merged

[Wasm] Add missing return buffer argument in wasm import thunks #128104

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24e0e75
Add missing return buffer argument in wasm import thunks
kg May 12, 2026
8f7f8bb
Handle this ptr not being present
kg May 12, 2026
f8dedf8
Checkpoint
kg May 12, 2026
1d75523
Remove fixme comment
kg May 13, 2026
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13 changes: 13 additions & 0 deletions ...tools/aot/ILCompiler.ReadyToRun/Compiler/DependencyAnalysis/ReadyToRun/WasmImportThunk.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -128,6 +128,7 @@ protected override void EmitCode(NodeFactory factory, ref Wasm.WasmEmitter instr

int[] offsets = new int[methodSignature.Length];
bool[] isIndirectStructArg = new bool[methodSignature.Length];
bool hasRetBuffArg = _wasmSignature.SignatureString[0] == 'S';

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int argIndex = 0;
int argOffset;
Expand Down Expand Up @@ -195,6 +196,11 @@ protected override void EmitCode(NodeFactory factory, ref Wasm.WasmEmitter instr
wasmLocalIndex++;
}

if (hasRetBuffArg)
{
wasmLocalIndex++;
}

for (int i = 0; i < methodSignature.Length; i++)
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{
TypeDesc paramType = methodSignature[i];
Expand Down Expand Up @@ -302,6 +308,13 @@ protected override void EmitCode(NodeFactory factory, ref Wasm.WasmEmitter instr
wasmLocalIndex++;
}

// Pass return buffer argument if needed
if (hasRetBuffArg)
{
expressions.Add(Local.Get(wasmLocalIndex));
wasmLocalIndex++;
}

for (int i = 0; i < methodSignature.Length; i++)
{
TypeDesc paramType = methodSignature[i];
Expand Down
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