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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_FUZZER_PASS_REPLACE_OPSELECTS_WITH_CONDITIONAL_BRANCHES_H_
#define SOURCE_FUZZ_FUZZER_PASS_REPLACE_OPSELECTS_WITH_CONDITIONAL_BRANCHES_H_
#include "source/fuzz/fuzzer_pass.h"
namespace spvtools {
namespace fuzz {
// A fuzzer pass to replace OpSelect instructions (where the condition is a
// scalar boolean) with conditional branches and OpPhi instructions.
class FuzzerPassReplaceOpSelectsWithConditionalBranches : public FuzzerPass {
public:
FuzzerPassReplaceOpSelectsWithConditionalBranches(
opt::IRContext* ir_context, TransformationContext* transformation_context,
FuzzerContext* fuzzer_context,
protobufs::TransformationSequence* transformations,
bool ignore_inapplicable_transformations);
void Apply() override;
private:
// Returns true if any of the following holds:
// - the instruction is not the first in its block
// - the block containing it is a merge block
// - the block does not have a unique predecessor
// - the predecessor of the block is the header of a construct
// - the predecessor does not branch unconditionally to the block
// If this function returns true, the block must be split before the
// instruction for TransformationReplaceOpSelectWithConditionalBranch to be
// applicable.
// Assumes that the instruction is OpSelect.
bool InstructionNeedsSplitBefore(opt::Instruction* instruction);
};
} // namespace fuzz
} // namespace spvtools
#endif // SOURCE_FUZZ_FUZZER_PASS_REPLACE_OPSELECTS_WITH_CONDITIONAL_BRANCHES_H_
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