mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-12-28 18:51:05 +00:00
96354f5047
This change adds a transformation and associated fuzzer pass for merging adjacent blocks in a module, re-using block merging code from the optimizer.
66 lines
2.5 KiB
C++
66 lines
2.5 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_merge_blocks.h"
|
|
|
|
#include <vector>
|
|
|
|
#include "source/fuzz/transformation_merge_blocks.h"
|
|
|
|
namespace spvtools {
|
|
namespace fuzz {
|
|
|
|
FuzzerPassMergeBlocks::FuzzerPassMergeBlocks(
|
|
opt::IRContext* ir_context, FactManager* fact_manager,
|
|
FuzzerContext* fuzzer_context,
|
|
protobufs::TransformationSequence* transformations)
|
|
: FuzzerPass(ir_context, fact_manager, fuzzer_context, transformations) {}
|
|
|
|
FuzzerPassMergeBlocks::~FuzzerPassMergeBlocks() = default;
|
|
|
|
void FuzzerPassMergeBlocks::Apply() {
|
|
// First we populate a sequence of transformations that we might consider
|
|
// applying.
|
|
std::vector<TransformationMergeBlocks> potential_transformations;
|
|
// We do this by considering every block of every function.
|
|
for (auto& function : *GetIRContext()->module()) {
|
|
for (auto& block : function) {
|
|
// We probabilistically decide to ignore some blocks.
|
|
if (!GetFuzzerContext()->ChoosePercentage(
|
|
GetFuzzerContext()->GetChanceOfMergingBlocks())) {
|
|
continue;
|
|
}
|
|
// For other blocks, we add a transformation to merge the block into its
|
|
// predecessor if that transformation would be applicable.
|
|
TransformationMergeBlocks transformation(block.id());
|
|
if (transformation.IsApplicable(GetIRContext(), *GetFactManager())) {
|
|
potential_transformations.push_back(transformation);
|
|
}
|
|
}
|
|
}
|
|
|
|
while (!potential_transformations.empty()) {
|
|
uint32_t index = GetFuzzerContext()->RandomIndex(potential_transformations);
|
|
auto transformation = potential_transformations.at(index);
|
|
potential_transformations.erase(potential_transformations.begin() + index);
|
|
if (transformation.IsApplicable(GetIRContext(), *GetFactManager())) {
|
|
transformation.Apply(GetIRContext(), GetFactManager());
|
|
*GetTransformations()->add_transformation() = transformation.ToMessage();
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace fuzz
|
|
} // namespace spvtools
|