1 /* 2 * Copyright (C) 2014 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_BASE_ARENA_OBJECT_H_ 18 #define ART_RUNTIME_BASE_ARENA_OBJECT_H_ 19 20 #include "base/arena_allocator.h" 21 #include "base/logging.h" 22 #include "scoped_arena_allocator.h" 23 24 namespace art { 25 26 // Parent for arena allocated objects giving appropriate new and delete operators. 27 template<enum ArenaAllocKind kAllocKind> 28 class ArenaObject { 29 public: 30 // Allocate a new ArenaObject of 'size' bytes in the Arena. 31 void* operator new(size_t size, ArenaAllocator* allocator) { 32 return allocator->Alloc(size, kAllocKind); 33 } 34 35 static void* operator new(size_t size, ScopedArenaAllocator* arena) { 36 return arena->Alloc(size, kAllocKind); 37 } 38 39 void operator delete(void*, size_t) { 40 LOG(FATAL) << "UNREACHABLE"; 41 UNREACHABLE(); 42 } 43 44 // NOTE: Providing placement new (and matching delete) for constructing container elements. 45 ALWAYS_INLINE void* operator new(size_t, void* ptr) noexcept { return ptr; } 46 ALWAYS_INLINE void operator delete(void*, void*) noexcept { } 47 }; 48 49 50 // Parent for arena allocated objects that get deleted, gives appropriate new and delete operators. 51 template<enum ArenaAllocKind kAllocKind> 52 class DeletableArenaObject { 53 public: 54 // Allocate a new ArenaObject of 'size' bytes in the Arena. 55 void* operator new(size_t size, ArenaAllocator* allocator) { 56 return allocator->Alloc(size, kAllocKind); 57 } 58 59 static void* operator new(size_t size, ScopedArenaAllocator* arena) { 60 return arena->Alloc(size, kAllocKind); 61 } 62 63 void operator delete(void*, size_t) { 64 // Nop. 65 } 66 }; 67 68 } // namespace art 69 70 #endif // ART_RUNTIME_BASE_ARENA_OBJECT_H_ 71
