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