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Fuzzer: Use types from imported module #7990

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Merged
kripken merged 2 commits into from
Oct 24, 2025
Merged

Fuzzer: Use types from imported module #7990

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kripken Oct 23, 2025
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kripken Oct 23, 2025
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19 changes: 15 additions & 4 deletions src/tools/fuzzing/fuzzing.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -450,6 +450,17 @@ void TranslateToFuzzReader::setupHeapTypes() {
// initial content we began with.
auto possibleHeapTypes = ModuleUtils::collectHeapTypes(wasm);

// Use heap types from an imported module, if present.
if (importedModule) {
auto importedHeapTypes = ModuleUtils::collectHeapTypes(*importedModule);
auto rate = upTo(11);
for (auto type : importedHeapTypes) {
if (upTo(10) < rate) {
possibleHeapTypes.push_back(type);
}
}
}

// Filter away uninhabitable heap types, that is, heap types that we cannot
// construct, like a type with a non-nullable reference to itself.
interestingHeapTypes = HeapTypeGenerator::getInhabitable(possibleHeapTypes);
Expand Down Expand Up @@ -1213,9 +1224,9 @@ void TranslateToFuzzReader::useImportedFunctions() {
}

// Add some of the module's exported functions as imports, at a random rate.
auto rate = upTo(100);
auto rate = upTo(11);
for (auto& exp : importedModule->exports) {
if (exp->kind != ExternalKind::Function || upTo(100) > rate) {
if (exp->kind != ExternalKind::Function || upTo(10) >= rate) {
continue;
}

Expand Down Expand Up @@ -1243,9 +1254,9 @@ void TranslateToFuzzReader::useImportedGlobals() {
}

// Add some of the module's exported globals as imports, at a random rate.
auto rate = upTo(100);
auto rate = upTo(11);
for (auto& exp : importedModule->exports) {
if (exp->kind != ExternalKind::Global || upTo(100) > rate) {
if (exp->kind != ExternalKind::Global || upTo(10) >= rate) {
continue;
}

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