mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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68 lines
2.6 KiB
C++
68 lines
2.6 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_add_dead_blocks.h"
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#include "source/fuzz/fuzzer_util.h"
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#include "source/fuzz/transformation_add_dead_block.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassAddDeadBlocks::FuzzerPassAddDeadBlocks(
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opt::IRContext* ir_context, TransformationContext* transformation_context,
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FuzzerContext* fuzzer_context,
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protobufs::TransformationSequence* transformations)
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: FuzzerPass(ir_context, transformation_context, fuzzer_context,
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transformations) {}
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FuzzerPassAddDeadBlocks::~FuzzerPassAddDeadBlocks() = default;
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void FuzzerPassAddDeadBlocks::Apply() {
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// We iterate over all blocks in the module collecting up those at which we
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// might add a branch to a new dead block. We then loop over all such
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// candidates and actually apply transformations. This separation is to
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// avoid modifying the module as we traverse it.
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std::vector<TransformationAddDeadBlock> candidate_transformations;
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for (auto& function : *GetIRContext()->module()) {
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for (auto& block : function) {
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if (!GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfAddingDeadBlock())) {
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continue;
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}
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// Make sure the module contains a boolean constant equal to
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// |condition_value|.
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bool condition_value = GetFuzzerContext()->ChooseEven();
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FindOrCreateBoolConstant(condition_value, false);
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// We speculatively create a transformation, and then apply it (below) if
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// it turns out to be applicable. This avoids duplicating the logic for
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// applicability checking.
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//
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// It means that fresh ids for transformations that turn out not to be
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// applicable end up being unused.
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candidate_transformations.emplace_back(TransformationAddDeadBlock(
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GetFuzzerContext()->GetFreshId(), block.id(), condition_value));
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}
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}
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// Apply all those transformations that are in fact applicable.
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for (auto& transformation : candidate_transformations) {
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MaybeApplyTransformation(transformation);
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}
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}
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} // namespace fuzz
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} // namespace spvtools
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