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https://github.com/KhronosGroup/SPIRV-Tools
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89 lines
3.8 KiB
C++
89 lines
3.8 KiB
C++
// Copyright (c) 2020 Vasyl Teliman
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SOURCE_FUZZ_TRANSFORMATION_WRAP_REGION_IN_SELECTION_H_
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#define SOURCE_FUZZ_TRANSFORMATION_WRAP_REGION_IN_SELECTION_H_
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#include "source/fuzz/protobufs/spirvfuzz_protobufs.h"
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#include "source/fuzz/transformation.h"
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#include "source/fuzz/transformation_context.h"
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#include "source/opt/ir_context.h"
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namespace spvtools {
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namespace fuzz {
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class TransformationWrapRegionInSelection : public Transformation {
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public:
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explicit TransformationWrapRegionInSelection(
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const protobufs::TransformationWrapRegionInSelection& message);
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TransformationWrapRegionInSelection(uint32_t region_entry_block_id,
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uint32_t region_exit_block_id,
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bool branch_condition);
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// - It should be possible to apply this transformation to a
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// single-exit-single-entry region of blocks dominated by
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// |region_entry_block_id| and postdominated by |region_exit_block_id|
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// (see IsApplicableToBlockRange method for further details).
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//
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// TODO(https://github.com/KhronosGroup/SPIRV-Tools/issues/3828):
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// Consider applying this transformation to non-single-entry-single-exit
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// regions of blocks.
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// - There must exist an irrelevant boolean constant with value
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// |branch_condition|.
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bool IsApplicable(
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opt::IRContext* ir_context,
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const TransformationContext& transformation_context) const override;
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// - Transforms |region_entry_block_id| into a selection header with both
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// branches pointing to the block's successor.
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// - |branch_condition| is used as a condition in the header's
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// OpBranchConditional instruction.
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// - Transforms |region_exit_block_id| into a merge block of the selection's
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// header.
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void Apply(opt::IRContext* ir_context,
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TransformationContext* transformation_context) const override;
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protobufs::Transformation ToMessage() const override;
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// Returns true if it's possible to apply this transformation to the
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// single-exit-single-entry region of blocks starting with
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// |header_block_candidate_id| and ending with |merge_block_candidate_id|.
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// Concretely:
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// - Both |header_block_candidate_id| and |merge_block_candidate_id| must be
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// result ids of some blocks in the module.
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// - Both blocks must belong to the same function.
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// - |header_block_candidate_id| must strictly dominate
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// |merge_block_candidate_id| and |merge_block_candidate_id| must strictly
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// postdominate |header_block_candidate_id|.
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// - |header_block_candidate_id| can't be a header block of any construct.
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// - |header_block_candidate_id|'s terminator must be an OpBranch.
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// - |merge_block_candidate_id| can't be a merge block of any other construct.
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// - Both |header_block_candidate_id| and |merge_block_candidate_id| must be
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// inside the same construct if any.
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static bool IsApplicableToBlockRange(opt::IRContext* ir_context,
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uint32_t header_block_candidate_id,
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uint32_t merge_block_candidate_id);
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std::unordered_set<uint32_t> GetFreshIds() const override;
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private:
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protobufs::TransformationWrapRegionInSelection message_;
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};
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} // namespace fuzz
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} // namespace spvtools
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#endif // SOURCE_FUZZ_TRANSFORMATION_WRAP_REGION_IN_SELECTION_H_
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