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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.
#ifndef SOURCE_FUZZ_FUZZER_PASS_OUTLINE_FUNCTIONS_H_
#define SOURCE_FUZZ_FUZZER_PASS_OUTLINE_FUNCTIONS_H_
#include "source/fuzz/fuzzer_pass.h"
namespace spvtools {
namespace fuzz {
// A fuzzer pass for outlining single-entry single-exit regions of a control
// flow graph into their own functions.
class FuzzerPassOutlineFunctions : public FuzzerPass {
public:
FuzzerPassOutlineFunctions(
opt::IRContext* ir_context, TransformationContext* transformation_context,
FuzzerContext* fuzzer_context,
protobufs::TransformationSequence* transformations);
void Apply() override;
// Returns a block suitable to be an entry block for a region that can be
// outlined, i.e. a block that is not a loop header and that does not start
// with OpPhi or OpVariable. In particular, it returns:
// - |entry_block| if it is suitable
// - otherwise, a block found by:
// - looking for or creating a new preheader, if |entry_block| is a loop
// header
// - splitting the candidate entry block, if it starts with OpPhi or
// OpVariable.
// Returns nullptr if a suitable block cannot be found following the
// instructions above.
opt::BasicBlock* MaybeGetEntryBlockSuitableForOutlining(
opt::BasicBlock* entry_block);
// Returns:
// - |exit_block| if it is not a merge block
// - the second block obtained by splitting |exit_block|, if |exit_block| is a
// merge block.
// Assumes that |exit_block| is not a continue target.
// The block returned by this function should be suitable to be the exit block
// of a region that can be outlined.
// Returns nullptr if |exit_block| is a merge block and it cannot be split.
opt::BasicBlock* MaybeGetExitBlockSuitableForOutlining(
opt::BasicBlock* exit_block);
};
} // namespace fuzz
} // namespace spvtools
#endif // SOURCE_FUZZ_FUZZER_PASS_OUTLINE_FUNCTIONS_H_
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