76 строки
2.6 KiB
C++
76 строки
2.6 KiB
C++
// Copyright (c) 2021 Mostafa Ashraf
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "source/fuzz/fuzzer_pass_permute_function_variables.h"
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#include <algorithm>
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#include <numeric>
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#include <vector>
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#include "source/fuzz/fuzzer_context.h"
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#include "source/fuzz/fuzzer_util.h"
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#include "source/fuzz/instruction_descriptor.h"
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#include "source/fuzz/transformation_swap_function_variables.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassPermuteFunctionVariables::FuzzerPassPermuteFunctionVariables(
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opt::IRContext* ir_context, TransformationContext* transformation_context,
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FuzzerContext* fuzzer_context,
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protobufs::TransformationSequence* transformations,
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bool ignore_inapplicable_transformations)
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: FuzzerPass(ir_context, transformation_context, fuzzer_context,
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transformations, ignore_inapplicable_transformations) {
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} // Here we call parent constructor.
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void FuzzerPassPermuteFunctionVariables::Apply() {
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// Permuting OpVariable instructions in each function.
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for (auto& function : *GetIRContext()->module()) {
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if (!GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfPermutingFunctionVariables())) {
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continue;
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}
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auto first_block = function.entry().get();
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std::vector<opt::Instruction*> variables;
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for (auto& instruction : *first_block) {
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if (instruction.opcode() == spv::Op::OpVariable) {
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variables.push_back(&instruction);
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}
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}
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if (variables.size() <= 1) {
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continue;
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}
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do {
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uint32_t instruction_1_index = GetFuzzerContext()->RandomIndex(variables);
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uint32_t instruction_2_index = GetFuzzerContext()->RandomIndex(variables);
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if (instruction_1_index != instruction_2_index) {
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ApplyTransformation(TransformationSwapFunctionVariables(
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variables[instruction_1_index]->result_id(),
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variables[instruction_2_index]->result_id()));
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}
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} while (GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()
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->GetChanceOfSwappingAnotherPairOfFunctionVariables()) &&
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variables.size() > 2);
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}
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}
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} // namespace fuzz
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} // namespace spvtools
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