mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-12-04 08:20:06 +00:00
0a2b38d082
A new transformation and associated fuzzer pass in spirv-fuzz that selects single-entry single-exit control flow graph regions and for each selected region outlines the region into a new function and replaces the original region with a call to this function.
100 lines
4.0 KiB
C++
100 lines
4.0 KiB
C++
// Copyright (c) 2019 Google LLC
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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_outline_functions.h"
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#include <vector>
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#include "source/fuzz/fuzzer_util.h"
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#include "source/fuzz/transformation_outline_function.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassOutlineFunctions::FuzzerPassOutlineFunctions(
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opt::IRContext* ir_context, FactManager* fact_manager,
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FuzzerContext* fuzzer_context,
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protobufs::TransformationSequence* transformations)
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: FuzzerPass(ir_context, fact_manager, fuzzer_context, transformations) {}
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FuzzerPassOutlineFunctions::~FuzzerPassOutlineFunctions() = default;
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void FuzzerPassOutlineFunctions::Apply() {
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std::vector<opt::Function*> original_functions;
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for (auto& function : *GetIRContext()->module()) {
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original_functions.push_back(&function);
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}
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for (auto& function : original_functions) {
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if (!GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfOutliningFunction())) {
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continue;
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}
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std::vector<opt::BasicBlock*> blocks;
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for (auto& block : *function) {
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blocks.push_back(&block);
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}
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auto entry_block = blocks[GetFuzzerContext()->RandomIndex(blocks)];
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auto dominator_analysis = GetIRContext()->GetDominatorAnalysis(function);
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auto postdominator_analysis =
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GetIRContext()->GetPostDominatorAnalysis(function);
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std::vector<opt::BasicBlock*> candidate_exit_blocks;
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for (auto postdominates_entry_block = entry_block;
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postdominates_entry_block != nullptr;
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postdominates_entry_block = postdominator_analysis->ImmediateDominator(
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postdominates_entry_block)) {
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if (dominator_analysis->Dominates(entry_block,
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postdominates_entry_block)) {
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candidate_exit_blocks.push_back(postdominates_entry_block);
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}
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}
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if (candidate_exit_blocks.empty()) {
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continue;
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}
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auto exit_block = candidate_exit_blocks[GetFuzzerContext()->RandomIndex(
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candidate_exit_blocks)];
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auto region_blocks = TransformationOutlineFunction::GetRegionBlocks(
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GetIRContext(), entry_block, exit_block);
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std::map<uint32_t, uint32_t> input_id_to_fresh_id;
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for (auto id : TransformationOutlineFunction::GetRegionInputIds(
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GetIRContext(), region_blocks, exit_block)) {
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input_id_to_fresh_id[id] = GetFuzzerContext()->GetFreshId();
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}
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std::map<uint32_t, uint32_t> output_id_to_fresh_id;
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for (auto id : TransformationOutlineFunction::GetRegionOutputIds(
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GetIRContext(), region_blocks, exit_block)) {
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output_id_to_fresh_id[id] = GetFuzzerContext()->GetFreshId();
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}
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TransformationOutlineFunction transformation(
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entry_block->id(), exit_block->id(),
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/*new_function_struct_return_type_id*/
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GetFuzzerContext()->GetFreshId(),
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/*new_function_type_id*/ GetFuzzerContext()->GetFreshId(),
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/*new_function_id*/ GetFuzzerContext()->GetFreshId(),
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/*new_function_region_entry_block*/
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GetFuzzerContext()->GetFreshId(),
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/*new_caller_result_id*/ GetFuzzerContext()->GetFreshId(),
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/*new_callee_result_id*/ GetFuzzerContext()->GetFreshId(),
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/*input_id_to_fresh_id*/ std::move(input_id_to_fresh_id),
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/*output_id_to_fresh_id*/ std::move(output_id_to_fresh_id));
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if (transformation.IsApplicable(GetIRContext(), *GetFactManager())) {
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transformation.Apply(GetIRContext(), GetFactManager());
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*GetTransformations()->add_transformation() = transformation.ToMessage();
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}
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}
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}
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} // namespace fuzz
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} // namespace spvtools
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