1 /* 2 * Copyright (C) 2015 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_RUNTIME_LINEAR_ALLOC_H_ 18 #define ART_RUNTIME_LINEAR_ALLOC_H_ 19 20 #include "base/arena_allocator.h" 21 #include "base/mutex.h" 22 23 namespace art { 24 25 class ArenaPool; 26 27 // TODO: Support freeing if we add poor man's class unloading. 28 class LinearAlloc { 29 public: 30 explicit LinearAlloc(ArenaPool* pool); 31 32 void* Alloc(Thread* self, size_t size) REQUIRES(!lock_); 33 void* AllocAlign16(Thread* self, size_t size) REQUIRES(!lock_); 34 35 // Realloc never frees the input pointer, it is the caller's job to do this if necessary. 36 void* Realloc(Thread* self, void* ptr, size_t old_size, size_t new_size) REQUIRES(!lock_); 37 38 // Allocate an array of structs of type T. 39 template<class T> AllocArray(Thread * self,size_t elements)40 T* AllocArray(Thread* self, size_t elements) REQUIRES(!lock_) { 41 return reinterpret_cast<T*>(Alloc(self, elements * sizeof(T))); 42 } 43 44 // Return the number of bytes used in the allocator. 45 size_t GetUsedMemory() const REQUIRES(!lock_); 46 47 ArenaPool* GetArenaPool() REQUIRES(!lock_); 48 49 // Return true if the linear alloc contrains an address. 50 bool Contains(void* ptr) const REQUIRES(!lock_); 51 52 // Unsafe version of 'Contains' only to be used when the allocator is going 53 // to be deleted. 54 bool ContainsUnsafe(void* ptr) const NO_THREAD_SAFETY_ANALYSIS; 55 56 private: 57 mutable Mutex lock_ DEFAULT_MUTEX_ACQUIRED_AFTER; 58 ArenaAllocator allocator_ GUARDED_BY(lock_); 59 60 DISALLOW_IMPLICIT_CONSTRUCTORS(LinearAlloc); 61 }; 62 63 } // namespace art 64 65 #endif // ART_RUNTIME_LINEAR_ALLOC_H_ 66