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 ART_COMPILER_UTILS_ATOMIC_METHOD_REF_MAP_H_ 18 #define ART_COMPILER_UTILS_ATOMIC_METHOD_REF_MAP_H_ 19 20 #include "base/dchecked_vector.h" 21 #include "method_reference.h" 22 #include "safe_map.h" 23 24 namespace art { 25 26 class DexFile; 27 28 // Used by CompilerCallbacks to track verification information from the Runtime. 29 template <typename T> 30 class AtomicMethodRefMap { 31 public: AtomicMethodRefMap()32 explicit AtomicMethodRefMap() {} ~AtomicMethodRefMap()33 ~AtomicMethodRefMap() {} 34 35 // Atomically swap the element in if the existing value matches expected. 36 enum InsertResult { 37 kInsertResultInvalidDexFile, 38 kInsertResultCASFailure, 39 kInsertResultSuccess, 40 }; 41 InsertResult Insert(MethodReference ref, const T& expected, const T& desired); 42 43 // Retreive an item, returns false if the dex file is not added. 44 bool Get(MethodReference ref, T* out) const; 45 46 // Dex files must be added before method references belonging to them can be used as keys. Not 47 // thread safe. 48 void AddDexFile(const DexFile* dex_file); 49 HaveDexFile(const DexFile * dex_file)50 bool HaveDexFile(const DexFile* dex_file) const { 51 return arrays_.find(dex_file) != arrays_.end(); 52 } 53 54 // Visit all of the dex files and elements. 55 template <typename Visitor> 56 void Visit(const Visitor& visitor); 57 58 void ClearEntries(); 59 60 private: 61 // Verified methods. The method array is fixed to avoid needing a lock to extend it. 62 using ElementArray = dchecked_vector<Atomic<T>>; 63 using DexFileArrays = SafeMap<const DexFile*, ElementArray>; 64 65 const ElementArray* GetArray(const DexFile* dex_file) const; 66 ElementArray* GetArray(const DexFile* dex_file); 67 68 DexFileArrays arrays_; 69 }; 70 71 } // namespace art 72 73 #endif // ART_COMPILER_UTILS_ATOMIC_METHOD_REF_MAP_H_ 74