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Fuzzer: Fix branching instructions in non-function scopes #7817

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Fuzzer: Fix branching instructions in non-function scopes #7817

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3dd09fc
fix
kripken Aug 12, 2025
a5f2d8c
fix
kripken Aug 12, 2025
12c7af8
fix
kripken Aug 12, 2025
1865544
fix
kripken Aug 12, 2025
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12 changes: 7 additions & 5 deletions src/tools/fuzzing/fuzzing.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2471,7 +2471,9 @@ Expression* TranslateToFuzzReader::makeTry(Type type) {

Expression* TranslateToFuzzReader::makeTryTable(Type type) {
auto* body = make(type);

if (!funcContext) {
return makeTrivial(type);
}
if (funcContext->breakableStack.empty()) {
// Nothing to break to, emit a trivial TryTable.
// TODO: Perhaps generate a block wrapping us?
Expand Down Expand Up @@ -2535,7 +2537,7 @@ Expression* TranslateToFuzzReader::makeTryTable(Type type) {
}

Expression* TranslateToFuzzReader::makeBreak(Type type) {
if (funcContext->breakableStack.empty()) {
if (!funcContext || funcContext->breakableStack.empty()) {
return makeTrivial(type);
}
Expression* condition = nullptr;
Expand Down Expand Up @@ -4340,8 +4342,8 @@ Expression* TranslateToFuzzReader::makeSelect(Type type) {

Expression* TranslateToFuzzReader::makeSwitch(Type type) {
assert(type == Type::unreachable);
if (funcContext->breakableStack.empty()) {
return make(type);
if (!funcContext || funcContext->breakableStack.empty()) {
return makeTrivial(type);
}
// we need to find proper targets to break to; try a bunch
int tries = fuzzParams->TRIES;
Expand Down Expand Up @@ -4855,7 +4857,7 @@ Expression* TranslateToFuzzReader::makeRefCast(Type type) {
}

Expression* TranslateToFuzzReader::makeBrOn(Type type) {
if (funcContext->breakableStack.empty()) {
if (!funcContext || funcContext->breakableStack.empty()) {
return makeTrivial(type);
}
// We need to find a proper target to break to; try a few times. Finding the
Expand Down
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