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// Copyright (c) 2020 Vasyl Teliman
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "source/fuzz/fuzzer_pass_mutate_pointers.h"
#include "source/fuzz/fuzzer_context.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/transformation_mutate_pointer.h"
namespace spvtools {
namespace fuzz {
FuzzerPassMutatePointers::FuzzerPassMutatePointers(
opt::IRContext* ir_context, TransformationContext* transformation_context,
FuzzerContext* fuzzer_context,
protobufs::TransformationSequence* transformations,
bool ignore_inapplicable_transformations)
: FuzzerPass(ir_context, transformation_context, fuzzer_context,
transformations, ignore_inapplicable_transformations) {}
void FuzzerPassMutatePointers::Apply() {
ForEachInstructionWithInstructionDescriptor(
[this](opt::Function* function, opt::BasicBlock* block,
opt::BasicBlock::iterator inst_it,
const protobufs::InstructionDescriptor& instruction_descriptor) {
if (!GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfMutatingPointer())) {
return;
}
if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(SpvOpLoad, inst_it)) {
return;
}
auto available_pointers = FindAvailableInstructions(
function, block, inst_it,
[](opt::IRContext* ir_context, opt::Instruction* inst) {
return TransformationMutatePointer::IsValidPointerInstruction(
ir_context, *inst);
});
if (available_pointers.empty()) {
return;
}
const auto* pointer_inst =
available_pointers[GetFuzzerContext()->RandomIndex(
available_pointers)];
// Make sure there is an irrelevant constant in the module.
FindOrCreateZeroConstant(fuzzerutil::GetPointeeTypeIdFromPointerType(
GetIRContext(), pointer_inst->type_id()),
true);
ApplyTransformation(TransformationMutatePointer(
pointer_inst->result_id(), GetFuzzerContext()->GetFreshId(),
instruction_descriptor));
});
}
} // namespace fuzz
} // namespace spvtools
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