SPIRV-Tools/source/fuzz/fuzzer_pass_outline_functions.cpp

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// 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, FactManager* fact_manager,
FuzzerContext* fuzzer_context,
protobufs::TransformationSequence* transformations)
: FuzzerPass(ir_context, fact_manager, 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(), *GetFactManager())) {
transformation.Apply(GetIRContext(), GetFactManager());
*GetTransformations()->add_transformation() = transformation.ToMessage();
}
}
}
} // namespace fuzz
} // namespace spvtools