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73 lines
3.2 KiB
C++
73 lines
3.2 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_FUZZER_PASS_ADD_OPPHI_SYNONYMS_H_
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#define SOURCE_FUZZ_FUZZER_PASS_ADD_OPPHI_SYNONYMS_H_
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#include "source/fuzz/fuzzer_pass.h"
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namespace spvtools {
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namespace fuzz {
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// A fuzzer pass to add OpPhi instructions which can take the values of ids that
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// have been marked as synonymous. This instruction will itself be marked as
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// synonymous with the others.
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class FuzzerPassAddOpPhiSynonyms : public FuzzerPass {
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public:
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FuzzerPassAddOpPhiSynonyms(opt::IRContext* ir_context,
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TransformationContext* transformation_context,
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FuzzerContext* fuzzer_context,
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protobufs::TransformationSequence* transformations,
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bool ignore_inapplicable_transformations);
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void Apply() override;
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// Computes the equivalence classes for the non-pointer and non-irrelevant ids
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// in the module, where two ids are considered equivalent iff they have been
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// declared synonymous and they have the same type.
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std::vector<std::set<uint32_t>> GetIdEquivalenceClasses();
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// Returns true iff |equivalence_class| contains at least
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// |distinct_ids_required| ids so that all of these ids are available at the
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// end of at least one predecessor of the block with label |block_id|.
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// Assumes that the block has at least one predecessor.
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bool EquivalenceClassIsSuitableForBlock(
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const std::set<uint32_t>& equivalence_class, uint32_t block_id,
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uint32_t distinct_ids_required);
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// Returns a vector with the ids that are available to use at the end of the
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// block with id |pred_id|, selected among the given |ids|. Assumes that
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// |pred_id| is the label of a block and all ids in |ids| exist in the module.
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std::vector<uint32_t> GetSuitableIds(const std::set<uint32_t>& ids,
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uint32_t pred_id);
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private:
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// Randomly chooses one of the equivalence classes in |candidates|, so that it
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// satisfies all of the following conditions:
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// - For each of the predecessors of the |block_id| block, there is at least
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// one id in the chosen equivalence class that is available at the end of
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// it.
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// - There are at least |distinct_ids_required| ids available at the end of
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// some predecessor.
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// Returns nullptr if no equivalence class in |candidates| satisfies the
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// requirements.
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std::set<uint32_t>* MaybeFindSuitableEquivalenceClassRandomly(
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const std::vector<std::set<uint32_t>*>& candidates, uint32_t block_id,
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uint32_t distinct_ids_required);
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};
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} // namespace fuzz
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} // namespace spvtools
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#endif // SOURCE_FUZZ_FUZZER_PASS_ADD_OPPHI_SYNONYMS_H_
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