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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_TRANSFORMATION_REPLACE_IRRELEVANT_ID_H_
#define SOURCE_FUZZ_TRANSFORMATION_REPLACE_IRRELEVANT_ID_H_
#include "source/fuzz/transformation.h"
namespace spvtools {
namespace fuzz {
class TransformationReplaceIrrelevantId : public Transformation {
public:
explicit TransformationReplaceIrrelevantId(
protobufs::TransformationReplaceIrrelevantId message);
TransformationReplaceIrrelevantId(
const protobufs::IdUseDescriptor& id_use_descriptor,
uint32_t replacement_id);
// - The id of interest in |message_.id_use_descriptor| is irrelevant
// according to the fact manager.
// - The types of the original id and of the replacement ids are the same.
// - The replacement must not be the result id of an OpFunction instruction.
// - |message_.replacement_id| is available to use at the enclosing
// instruction of |message_.id_use_descriptor|.
// - The original id is in principle replaceable with any other id of the same
// type. See fuzzerutil::IdUseCanBeReplaced for details.
bool IsApplicable(
opt::IRContext* ir_context,
const TransformationContext& transformation_context) const override;
// Replaces the use of an irrelevant id identified by
// |message_.id_use_descriptor| with the id |message_.replacement_id|, which
// has the same type as the id of interest.
void Apply(opt::IRContext* ir_context,
TransformationContext* transformation_context) const override;
std::unordered_set<uint32_t> GetFreshIds() const override;
protobufs::Transformation ToMessage() const override;
// Returns true if and only if |use_instruction| is OpVariable and
// |replacement_for_use| is not a constant instruction - i.e., if it would be
// illegal to replace the variable's initializer with the given instruction.
static bool AttemptsToReplaceVariableInitializerWithNonConstant(
const opt::Instruction& use_instruction,
const opt::Instruction& replacement_for_use);
private:
protobufs::TransformationReplaceIrrelevantId message_;
};
} // namespace fuzz
} // namespace spvtools
#endif // SOURCE_FUZZ_TRANSFORMATION_REPLACE_IRRELEVANT_ID_H_
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