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Fuzzer: Don't legalize if there is an imported module to fuzz with #8027

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Merged
kripken merged 3 commits into from
Nov 10, 2025
Merged

Fuzzer: Don't legalize if there is an imported module to fuzz with #8027

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edbae93
fix
kripken Nov 7, 2025
7c5b425
:wq
kripken Nov 7, 2025
06d84ba
Pick passes *after* setting flags, so we can see the flags
kripken Nov 7, 2025
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7 changes: 5 additions & 2 deletions src/tools/fuzzing/fuzzing.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -323,8 +323,11 @@ void TranslateToFuzzReader::pickPasses(OptimizationOptions& options) {

// Prune things that error in JS if we call them (like SIMD), some of the
// time. This alters the wasm/JS boundary quite a lot, so testing both forms
// is useful.
if (oneIn(2)) {
// is useful. Note that we do not do this if there is an imported module,
// because in that case legalization could alter the contract between the two
// (that is, if the first module has an i64 param, we must call it like that,
// and not as two i32s which we'd get after legalization).
if (!importedModule && oneIn(2)) {
options.passes.push_back("legalize-and-prune-js-interface");
}

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