1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_COMPILER_UTILS_DEDUPE_SET_H_ 18 #define ART_COMPILER_UTILS_DEDUPE_SET_H_ 19 20 #include <memory> 21 #include <stdint.h> 22 #include <string> 23 24 #include "base/macros.h" 25 26 namespace art { 27 28 class Thread; 29 30 // A set of Keys that support a HashFunc returning HashType. Used to find duplicates of Key in the 31 // Add method. The data-structure is thread-safe through the use of internal locks, it also 32 // supports the lock being sharded. 33 template <typename InKey, 34 typename StoreKey, 35 typename Alloc, 36 typename HashType, 37 typename HashFunc, 38 HashType kShard = 1> 39 class DedupeSet { 40 public: 41 // Add a new key to the dedupe set if not present. Return the equivalent deduplicated stored key. 42 const StoreKey* Add(Thread* self, const InKey& key); 43 44 DedupeSet(const char* set_name, const Alloc& alloc); 45 46 ~DedupeSet(); 47 48 std::string DumpStats(Thread* self) const; 49 50 private: 51 struct Stats; 52 class Shard; 53 54 std::unique_ptr<Shard> shards_[kShard]; 55 uint64_t hash_time_; 56 57 DISALLOW_COPY_AND_ASSIGN(DedupeSet); 58 }; 59 60 } // namespace art 61 62 #endif // ART_COMPILER_UTILS_DEDUPE_SET_H_ 63
