mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-11-23 04:00:05 +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
|
|
//
|
|
// 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
|