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https://github.com/KhronosGroup/SPIRV-Tools
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9c4481419e
spirv-fuzz features transformations that should be applicable by construction. Assertions are used to detect when such transformations turn out to be inapplicable. Failures of such assertions indicate bugs in the fuzzer. However, when using the fuzzer at scale (e.g. in ClusterFuzz) reports of these assertion failures create noise, and cause the fuzzer to exit early. This change adds an option whereby inapplicable transformations can be ignored. This reduces noise and allows fuzzing to continue even when a transformation that should be applicable but is not has been erroneously created.
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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