SPIRV-Tools/source/fuzz/comparator_deep_blocks_first.h

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// Copyright (c) 2020 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.
#ifndef SOURCE_FUZZ_COMPARATOR_BLOCKS_DEEP_FIRST_H_
#define SOURCE_FUZZ_COMPARATOR_BLOCKS_DEEP_FIRST_H_
#include "source/fuzz/fuzzer_util.h"
#include "source/opt/ir_context.h"
namespace spvtools {
namespace fuzz {
// Comparator for blocks, comparing them based on how deep they are nested
// inside selection or loop constructs. Deeper blocks are considered less than
// ones that are not as deep. The blocks are required to be in the same
// function.
class ComparatorDeepBlocksFirst {
public:
explicit ComparatorDeepBlocksFirst(opt::IRContext* ir_context)
: ir_context_(ir_context) {}
bool operator()(uint32_t bb1, uint32_t bb2) const {
return this->operator()(fuzzerutil::MaybeFindBlock(ir_context_, bb1),
fuzzerutil::MaybeFindBlock(ir_context_, bb2));
}
bool operator()(const opt::BasicBlock* bb1, opt::BasicBlock* bb2) const {
assert(bb1 && bb2 && "The blocks must exist.");
assert(bb1->GetParent() == bb2->GetParent() &&
"The blocks must be in the same functions.");
return ir_context_->GetStructuredCFGAnalysis()->NestingDepth(bb1->id()) >
ir_context_->GetStructuredCFGAnalysis()->NestingDepth(bb2->id());
}
private:
opt::IRContext* ir_context_;
};
} // namespace fuzz
} // namespace spvtools
#endif // SOURCE_FUZZ_COMPARATOR_BLOCKS_DEEP_FIRST_H_