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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_merge_blocks.h"
#include <vector>
#include "source/fuzz/transformation_merge_blocks.h"
namespace spvtools {
namespace fuzz {
FuzzerPassMergeBlocks::FuzzerPassMergeBlocks(
opt::IRContext* ir_context, TransformationContext* transformation_context,
FuzzerContext* fuzzer_context,
protobufs::TransformationSequence* transformations,
bool ignore_inapplicable_transformations)
: FuzzerPass(ir_context, transformation_context, fuzzer_context,
transformations, ignore_inapplicable_transformations) {}
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(),
*GetTransformationContext())) {
potential_transformations.push_back(transformation);
}
}
}
while (!potential_transformations.empty()) {
auto transformation =
GetFuzzerContext()->RemoveAtRandomIndex(&potential_transformations);
MaybeApplyTransformation(transformation);
}
}
} // namespace fuzz
} // namespace spvtools
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