| // Copyright (c) 2020 Google LLC |
| // |
| // 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_REPEATED_PASS_MANAGER_LOOPED_WITH_RECOMMENDATIONS_H_ |
| #define SOURCE_FUZZ_REPEATED_PASS_MANAGER_LOOPED_WITH_RECOMMENDATIONS_H_ |
| |
| #include <vector> |
| |
| #include "source/fuzz/pass_management/repeated_pass_manager.h" |
| #include "source/fuzz/pass_management/repeated_pass_recommender.h" |
| |
| namespace spvtools { |
| namespace fuzz { |
| |
| // On construction, this pass manager creates a sequence of fuzzer passes which |
| // is not changed thereafter. Passes from this sequence are served up in round |
| // robin fashion each time ChoosePass is invoked - i.e., the sequence is a "pass |
| // loop". |
| // |
| // The pass loop is constructed by repeatedly: |
| // - Randomly adding an enabled pass |
| // - Adding all recommended follow-on passes for this pass |
| // and probabilistically terminating this process. |
| class RepeatedPassManagerLoopedWithRecommendations |
| : public RepeatedPassManager { |
| public: |
| RepeatedPassManagerLoopedWithRecommendations( |
| FuzzerContext* fuzzer_context, RepeatedPassInstances* pass_instances, |
| RepeatedPassRecommender* pass_recommender); |
| |
| ~RepeatedPassManagerLoopedWithRecommendations() override; |
| |
| FuzzerPass* ChoosePass(const protobufs::TransformationSequence& |
| applied_transformations) override; |
| |
| private: |
| // The loop of fuzzer passes to be applied, populated on construction. |
| std::vector<FuzzerPass*> pass_loop_; |
| |
| // A set of indices into |pass_loop_| recording which passes are in the loop |
| // because they are recommended based on previous passes in the loop. This |
| // allows these recommended passes to be skipped if the passes they are |
| // meant to amplify had no effect. |
| std::unordered_set<uint32_t> recommended_pass_indices_; |
| |
| // Used to detect when chosen passes have had no effect, so that their |
| // associated recommendations are skipped. |
| uint32_t num_transformations_applied_before_last_pass_choice_; |
| |
| // An index into |pass_loop_| specifying which pass should be served up next |
| // time ChoosePass is invoked. |
| uint32_t next_pass_index_; |
| }; |
| |
| } // namespace fuzz |
| } // namespace spvtools |
| |
| #endif // SOURCE_FUZZ_REPEATED_PASS_MANAGER_LOOPED_WITH_RECOMMENDATIONS_H_ |