1 /* 2 * Copyright (C) 2016 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 LIBMEMUNREACHABLE_LEAK_H_ 18 #define LIBMEMUNREACHABLE_LEAK_H_ 19 20 #include <functional> 21 #include <vector> 22 23 #include "memunreachable/memunreachable.h" 24 25 // Custom std::hash specialization so that Leak::Backtrace can be used 26 // as a key in std::unordered_map. 27 namespace std { 28 29 template <> 30 struct hash<android::Leak::Backtrace> { 31 std::size_t operator()(const android::Leak::Backtrace& key) const { 32 std::size_t seed = 0; 33 34 hash_combine(seed, key.num_frames); 35 for (size_t i = 0; i < key.num_frames; i++) { 36 hash_combine(seed, key.frames[i]); 37 } 38 39 return seed; 40 } 41 42 private: 43 template <typename T> 44 inline void hash_combine(std::size_t& seed, const T& v) const { 45 std::hash<T> hasher; 46 seed ^= hasher(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2); 47 } 48 }; 49 50 } // namespace std 51 52 namespace android { 53 54 static bool operator==(const Leak::Backtrace& lhs, const Leak::Backtrace& rhs) { 55 return (lhs.num_frames == rhs.num_frames) && 56 memcmp(lhs.frames, rhs.frames, lhs.num_frames * sizeof(lhs.frames[0])) == 0; 57 } 58 } 59 60 #endif 61