mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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66 lines
2.5 KiB
C++
66 lines
2.5 KiB
C++
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// 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_merge_blocks.h"
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#include <vector>
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#include "source/fuzz/transformation_merge_blocks.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassMergeBlocks::FuzzerPassMergeBlocks(
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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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FuzzerPassMergeBlocks::~FuzzerPassMergeBlocks() = default;
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void FuzzerPassMergeBlocks::Apply() {
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// First we populate a sequence of transformations that we might consider
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// applying.
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std::vector<TransformationMergeBlocks> potential_transformations;
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// We do this by considering every block of every function.
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for (auto& function : *GetIRContext()->module()) {
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for (auto& block : function) {
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// We probabilistically decide to ignore some blocks.
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if (!GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfMergingBlocks())) {
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continue;
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}
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// For other blocks, we add a transformation to merge the block into its
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// predecessor if that transformation would be applicable.
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TransformationMergeBlocks transformation(block.id());
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if (transformation.IsApplicable(GetIRContext(), *GetFactManager())) {
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potential_transformations.push_back(transformation);
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}
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}
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}
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while (!potential_transformations.empty()) {
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uint32_t index = GetFuzzerContext()->RandomIndex(potential_transformations);
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auto transformation = potential_transformations.at(index);
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potential_transformations.erase(potential_transformations.begin() + index);
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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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