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https://github.com/KhronosGroup/SPIRV-Tools
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fcb22ecf0f
Adds a virtual method, GetFreshIds(), to Transformation. Every transformation uses this to indicate which ids in its protobuf message are fresh ids. This means that when replaying a sequence of transformations the replayer can obtain a smallest id that is not in use by the module already and that will not be used by any transformation by necessity. Ids greater than or equal to this id can be used as overflow ids. Fixes #3851.
60 lines
2.2 KiB
C++
60 lines
2.2 KiB
C++
// Copyright (c) 2020 Google LLC
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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_ADD_LOOP_PREHEADER_H
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#define SOURCE_FUZZ_TRANSFORMATION_ADD_LOOP_PREHEADER_H
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#include "source/fuzz/transformation.h"
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namespace spvtools {
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namespace fuzz {
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class TransformationAddLoopPreheader : public Transformation {
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public:
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explicit TransformationAddLoopPreheader(
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const protobufs::TransformationAddLoopPreheader& message);
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TransformationAddLoopPreheader(uint32_t loop_header_block, uint32_t fresh_id,
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std::vector<uint32_t> phi_id);
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// - |message_.loop_header_block| must be the id of a loop header block in
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// the given module.
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// - |message_.fresh_id| must be an available id.
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// - |message_.phi_ids| must be a list of available ids.
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// It can be empty if the loop header only has one predecessor outside of
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// the loop. Otherwise, it must contain at least as many ids as OpPhi
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// instructions in the loop header block.
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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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// Adds a preheader block as the unique out-of-loop predecessor of the given
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// loop header block. All of the existing out-of-loop predecessors of the
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// header are changed so that they branch to the preheader instead.
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void Apply(opt::IRContext* ir_context,
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TransformationContext* transformation_context) const override;
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std::unordered_set<uint32_t> GetFreshIds() const override;
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protobufs::Transformation ToMessage() const override;
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private:
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protobufs::TransformationAddLoopPreheader 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_ADD_LOOP_PREHEADER_H
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