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spirvfuzz: Fix type-related bug, change undef to zero, and add assert #3188

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Feb 14, 2020
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spirvfuzz: Fix type-related bug, change undef to zero, and add assert #3188

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9 changes: 7 additions & 2 deletions source/fuzz/fuzzer_pass_donate_modules.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,8 @@ void FuzzerPassDonateModules::Apply() {
std::unique_ptr<opt::IRContext> donor_ir_context = donor_suppliers_.at(
GetFuzzerContext()->RandomIndex(donor_suppliers_))();
assert(donor_ir_context != nullptr && "Supplying of donor failed");
assert(fuzzerutil::IsValid(donor_ir_context.get()) &&
"The donor module must be valid");
// Donate the supplied module.
//
// Randomly decide whether to make the module livesafe (see
Expand Down Expand Up @@ -668,9 +670,12 @@ void FuzzerPassDonateModules::HandleFunctions(
// The return type is void, so we don't need a return value.
kill_unreachable_return_value_id = 0;
} else {
// We do need a return value; we use OpUndef.
// We do need a return value; we use zero.
assert(function_return_type_inst->opcode() != SpvOpTypePointer &&
"Function return type must not be a pointer.");
kill_unreachable_return_value_id =
FindOrCreateGlobalUndef(function_return_type_inst->type_id());
FindOrCreateZeroConstant(original_id_to_donated_id->at(
function_return_type_inst->result_id()));
}
// Add the function in a livesafe manner.
ApplyTransformation(TransformationAddFunction(
Expand Down