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// Copyright (c) 2020 Stefano Milizia
// 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_FUZZER_PASS_INTERCHANGE_ZERO_LIKE_CONSTANTS_H_
#define SOURCE_FUZZ_FUZZER_PASS_INTERCHANGE_ZERO_LIKE_CONSTANTS_H_
#include "source/fuzz/fuzzer_pass.h"
namespace spvtools {
namespace fuzz {
// A pass that:
// - Finds all the zero-like constant definitions in the module and adds the
// definitions of the corresponding synonym, recording the fact that they
// are synonymous. If the synonym is already in the module, it does not
// add a new one.
// - For each use of a zero-like constant, decides whether to change it to the
// id of the toggled constant.
class FuzzerPassInterchangeZeroLikeConstants : public FuzzerPass {
public:
FuzzerPassInterchangeZeroLikeConstants(
opt::IRContext* ir_context, TransformationContext* transformation_context,
FuzzerContext* fuzzer_context,
protobufs::TransformationSequence* transformations);
void Apply() override;
private:
// Given the declaration of a zero-like constant, it finds or creates the
// corresponding toggled constant (a scalar constant of value 0 becomes a
// null constant of the same type and vice versa).
// Returns the id of the toggled instruction if the constant is zero-like,
// 0 otherwise.
uint32_t FindOrCreateToggledConstant(opt::Instruction* declaration);
};
} // namespace fuzz
} // namespace spvtools
#endif // SOURCE_FUZZ_FUZZER_PASS_INTERCHANGE_ZERO_LIKE_CONSTANTS_H_
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