1 /* 2 * Copyright (C) 2013 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_GC_SPACE_BUMP_POINTER_SPACE_INL_H_ 18 #define ART_RUNTIME_GC_SPACE_BUMP_POINTER_SPACE_INL_H_ 19 20 #include "bump_pointer_space.h" 21 22 namespace art { 23 namespace gc { 24 namespace space { 25 26 inline mirror::Object* BumpPointerSpace::Alloc(Thread*, size_t num_bytes, size_t* bytes_allocated, 27 size_t* usable_size) { 28 num_bytes = RoundUp(num_bytes, kAlignment); 29 mirror::Object* ret = AllocNonvirtual(num_bytes); 30 if (LIKELY(ret != nullptr)) { 31 *bytes_allocated = num_bytes; 32 if (usable_size != nullptr) { 33 *usable_size = num_bytes; 34 } 35 } 36 return ret; 37 } 38 39 inline mirror::Object* BumpPointerSpace::AllocThreadUnsafe(Thread* self, size_t num_bytes, 40 size_t* bytes_allocated, 41 size_t* usable_size) { 42 Locks::mutator_lock_->AssertExclusiveHeld(self); 43 num_bytes = RoundUp(num_bytes, kAlignment); 44 byte* end = end_.LoadRelaxed(); 45 if (end + num_bytes > growth_end_) { 46 return nullptr; 47 } 48 mirror::Object* obj = reinterpret_cast<mirror::Object*>(end); 49 end_.StoreRelaxed(end + num_bytes); 50 *bytes_allocated = num_bytes; 51 // Use the CAS free versions as an optimization. 52 objects_allocated_.StoreRelaxed(objects_allocated_.LoadRelaxed() + 1); 53 bytes_allocated_.StoreRelaxed(bytes_allocated_.LoadRelaxed() + num_bytes); 54 if (UNLIKELY(usable_size != nullptr)) { 55 *usable_size = num_bytes; 56 } 57 return obj; 58 } 59 60 inline mirror::Object* BumpPointerSpace::AllocNonvirtualWithoutAccounting(size_t num_bytes) { 61 DCHECK(IsAligned<kAlignment>(num_bytes)); 62 byte* old_end; 63 byte* new_end; 64 do { 65 old_end = end_.LoadRelaxed(); 66 new_end = old_end + num_bytes; 67 // If there is no more room in the region, we are out of memory. 68 if (UNLIKELY(new_end > growth_end_)) { 69 return nullptr; 70 } 71 } while (!end_.CompareExchangeWeakSequentiallyConsistent(old_end, new_end)); 72 return reinterpret_cast<mirror::Object*>(old_end); 73 } 74 75 inline mirror::Object* BumpPointerSpace::AllocNonvirtual(size_t num_bytes) { 76 mirror::Object* ret = AllocNonvirtualWithoutAccounting(num_bytes); 77 if (ret != nullptr) { 78 objects_allocated_.FetchAndAddSequentiallyConsistent(1); 79 bytes_allocated_.FetchAndAddSequentiallyConsistent(num_bytes); 80 } 81 return ret; 82 } 83 84 inline size_t BumpPointerSpace::AllocationSizeNonvirtual(mirror::Object* obj, size_t* usable_size) 85 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 86 size_t num_bytes = obj->SizeOf(); 87 if (usable_size != nullptr) { 88 *usable_size = RoundUp(num_bytes, kAlignment); 89 } 90 return num_bytes; 91 } 92 93 } // namespace space 94 } // namespace gc 95 } // namespace art 96 97 #endif // ART_RUNTIME_GC_SPACE_BUMP_POINTER_SPACE_INL_H_ 98
