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// Copyright (c) 2021 Mostafa Ashraf
//
// 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_permute_function_variables.h"
#include <algorithm>
#include <numeric>
#include <vector>
#include "source/fuzz/fuzzer_context.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/instruction_descriptor.h"
#include "source/fuzz/transformation_swap_function_variables.h"
namespace spvtools {
namespace fuzz {
FuzzerPassPermuteFunctionVariables::FuzzerPassPermuteFunctionVariables(
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) {
} // Here we call parent constructor.
void FuzzerPassPermuteFunctionVariables::Apply() {
// Permuting OpVariable instructions in each function.
for (auto& function : *GetIRContext()->module()) {
if (!GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfPermutingFunctionVariables())) {
continue;
}
auto first_block = function.entry().get();
std::vector<opt::Instruction*> variables;
for (auto& instruction : *first_block) {
if (instruction.opcode() == spv::Op::OpVariable) {
variables.push_back(&instruction);
}
}
if (variables.size() <= 1) {
continue;
}
do {
uint32_t instruction_1_index = GetFuzzerContext()->RandomIndex(variables);
uint32_t instruction_2_index = GetFuzzerContext()->RandomIndex(variables);
if (instruction_1_index != instruction_2_index) {
ApplyTransformation(TransformationSwapFunctionVariables(
variables[instruction_1_index]->result_id(),
variables[instruction_2_index]->result_id()));
}
} while (GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()
->GetChanceOfSwappingAnotherPairOfFunctionVariables()) &&
variables.size() > 2);
}
}
} // namespace fuzz
} // namespace spvtools
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