| // Copyright (c) 2019 Google LLC |
| // |
| // 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_outline_functions.h" |
| |
| #include <vector> |
| |
| #include "source/fuzz/fuzzer_util.h" |
| #include "source/fuzz/transformation_outline_function.h" |
| |
| namespace spvtools { |
| namespace fuzz { |
| |
| FuzzerPassOutlineFunctions::FuzzerPassOutlineFunctions( |
| opt::IRContext* ir_context, TransformationContext* transformation_context, |
| FuzzerContext* fuzzer_context, |
| protobufs::TransformationSequence* transformations) |
| : FuzzerPass(ir_context, transformation_context, fuzzer_context, |
| transformations) {} |
| |
| FuzzerPassOutlineFunctions::~FuzzerPassOutlineFunctions() = default; |
| |
| void FuzzerPassOutlineFunctions::Apply() { |
| std::vector<opt::Function*> original_functions; |
| for (auto& function : *GetIRContext()->module()) { |
| original_functions.push_back(&function); |
| } |
| for (auto& function : original_functions) { |
| if (!GetFuzzerContext()->ChoosePercentage( |
| GetFuzzerContext()->GetChanceOfOutliningFunction())) { |
| continue; |
| } |
| std::vector<opt::BasicBlock*> blocks; |
| for (auto& block : *function) { |
| blocks.push_back(&block); |
| } |
| auto entry_block = blocks[GetFuzzerContext()->RandomIndex(blocks)]; |
| auto dominator_analysis = GetIRContext()->GetDominatorAnalysis(function); |
| auto postdominator_analysis = |
| GetIRContext()->GetPostDominatorAnalysis(function); |
| std::vector<opt::BasicBlock*> candidate_exit_blocks; |
| for (auto postdominates_entry_block = entry_block; |
| postdominates_entry_block != nullptr; |
| postdominates_entry_block = postdominator_analysis->ImmediateDominator( |
| postdominates_entry_block)) { |
| if (dominator_analysis->Dominates(entry_block, |
| postdominates_entry_block)) { |
| candidate_exit_blocks.push_back(postdominates_entry_block); |
| } |
| } |
| if (candidate_exit_blocks.empty()) { |
| continue; |
| } |
| auto exit_block = candidate_exit_blocks[GetFuzzerContext()->RandomIndex( |
| candidate_exit_blocks)]; |
| |
| auto region_blocks = TransformationOutlineFunction::GetRegionBlocks( |
| GetIRContext(), entry_block, exit_block); |
| std::map<uint32_t, uint32_t> input_id_to_fresh_id; |
| for (auto id : TransformationOutlineFunction::GetRegionInputIds( |
| GetIRContext(), region_blocks, exit_block)) { |
| input_id_to_fresh_id[id] = GetFuzzerContext()->GetFreshId(); |
| } |
| std::map<uint32_t, uint32_t> output_id_to_fresh_id; |
| for (auto id : TransformationOutlineFunction::GetRegionOutputIds( |
| GetIRContext(), region_blocks, exit_block)) { |
| output_id_to_fresh_id[id] = GetFuzzerContext()->GetFreshId(); |
| } |
| TransformationOutlineFunction transformation( |
| entry_block->id(), exit_block->id(), |
| /*new_function_struct_return_type_id*/ |
| GetFuzzerContext()->GetFreshId(), |
| /*new_function_type_id*/ GetFuzzerContext()->GetFreshId(), |
| /*new_function_id*/ GetFuzzerContext()->GetFreshId(), |
| /*new_function_region_entry_block*/ |
| GetFuzzerContext()->GetFreshId(), |
| /*new_caller_result_id*/ GetFuzzerContext()->GetFreshId(), |
| /*new_callee_result_id*/ GetFuzzerContext()->GetFreshId(), |
| /*input_id_to_fresh_id*/ std::move(input_id_to_fresh_id), |
| /*output_id_to_fresh_id*/ std::move(output_id_to_fresh_id)); |
| if (transformation.IsApplicable(GetIRContext(), |
| *GetTransformationContext())) { |
| transformation.Apply(GetIRContext(), GetTransformationContext()); |
| *GetTransformations()->add_transformation() = transformation.ToMessage(); |
| } |
| } |
| } |
| |
| } // namespace fuzz |
| } // namespace spvtools |