| // 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 |