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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_TRANSFORMATION_ADD_DEAD_BLOCK_H_
#define SOURCE_FUZZ_TRANSFORMATION_ADD_DEAD_BLOCK_H_
#include "source/fuzz/protobufs/spirvfuzz_protobufs.h"
#include "source/fuzz/transformation.h"
#include "source/fuzz/transformation_context.h"
#include "source/opt/ir_context.h"
namespace spvtools {
namespace fuzz {
class TransformationAddDeadBlock : public Transformation {
public:
explicit TransformationAddDeadBlock(
protobufs::TransformationAddDeadBlock message);
TransformationAddDeadBlock(uint32_t fresh_id, uint32_t existing_block,
bool condition_value);
// - |message_.fresh_id| must be a fresh id
// - A constant with the same value as |message_.condition_value| must be
// available
// - |message_.existing_block| must be a block that is not a loop header,
// and that ends with OpBranch to a block that is not a merge block nor
// continue target - this is because the successor will become the merge
// block of a selection construct headed at |message_.existing_block|
// - |message_.existing_block| must not be a back-edge block, since in this
// case the newly-added block would lead to another back-edge to the
// associated loop header
bool IsApplicable(
opt::IRContext* ir_context,
const TransformationContext& transformation_context) const override;
// Changes the OpBranch from |message_.existing_block| to its successor 's'
// to an OpBranchConditional to either 's' or a new block,
// |message_.fresh_id|, which itself unconditionally branches to 's'. The
// conditional branch uses |message.condition_value| as its condition, and is
// arranged so that control will pass to 's' at runtime.
void Apply(opt::IRContext* ir_context,
TransformationContext* transformation_context) const override;
std::unordered_set<uint32_t> GetFreshIds() const override;
protobufs::Transformation ToMessage() const override;
private:
protobufs::TransformationAddDeadBlock message_;
};
} // namespace fuzz
} // namespace spvtools
#endif // SOURCE_FUZZ_TRANSFORMATION_ADD_DEAD_BLOCK_H_
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