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// Copyright (c) 2020 Vasyl Teliman
//
// 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_WRAP_REGION_IN_SELECTION_H_
#define SOURCE_FUZZ_TRANSFORMATION_WRAP_REGION_IN_SELECTION_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 TransformationWrapRegionInSelection : public Transformation {
public:
explicit TransformationWrapRegionInSelection(
protobufs::TransformationWrapRegionInSelection message);
TransformationWrapRegionInSelection(uint32_t region_entry_block_id,
uint32_t region_exit_block_id,
bool branch_condition);
// - It should be possible to apply this transformation to a
// single-exit-single-entry region of blocks dominated by
// |region_entry_block_id| and postdominated by |region_exit_block_id|
// (see IsApplicableToBlockRange method for further details).
//
// TODO(https://github.com/KhronosGroup/SPIRV-Tools/issues/3828):
// Consider applying this transformation to non-single-entry-single-exit
// regions of blocks.
// - There must exist an irrelevant boolean constant with value
// |branch_condition|.
bool IsApplicable(
opt::IRContext* ir_context,
const TransformationContext& transformation_context) const override;
// - Transforms |region_entry_block_id| into a selection header with both
// branches pointing to the block's successor.
// - |branch_condition| is used as a condition in the header's
// OpBranchConditional instruction.
// - Transforms |region_exit_block_id| into a merge block of the selection's
// header.
void Apply(opt::IRContext* ir_context,
TransformationContext* transformation_context) const override;
protobufs::Transformation ToMessage() const override;
// Returns true if it's possible to apply this transformation to the
// single-exit-single-entry region of blocks starting with
// |header_block_candidate_id| and ending with |merge_block_candidate_id|.
// Concretely:
// - Both |header_block_candidate_id| and |merge_block_candidate_id| must be
// result ids of some blocks in the module.
// - Both blocks must belong to the same function.
// - |header_block_candidate_id| must strictly dominate
// |merge_block_candidate_id| and |merge_block_candidate_id| must strictly
// postdominate |header_block_candidate_id|.
// - |header_block_candidate_id| can't be a header block of any construct.
// - |header_block_candidate_id|'s terminator must be an OpBranch.
// - |merge_block_candidate_id| can't be a merge block of any other construct.
// - Both |header_block_candidate_id| and |merge_block_candidate_id| must be
// inside the same construct if any.
static bool IsApplicableToBlockRange(opt::IRContext* ir_context,
uint32_t header_block_candidate_id,
uint32_t merge_block_candidate_id);
std::unordered_set<uint32_t> GetFreshIds() const override;
private:
protobufs::TransformationWrapRegionInSelection message_;
};
} // namespace fuzz
} // namespace spvtools
#endif // SOURCE_FUZZ_TRANSFORMATION_WRAP_REGION_IN_SELECTION_H_
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