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 #include "base/bit_utils.h" 23 24 namespace art { 25 namespace gc { 26 namespace space { 27 28 inline mirror::Object* BumpPointerSpace::Alloc(Thread*, size_t num_bytes, size_t* bytes_allocated, 29 size_t* usable_size, 30 size_t* bytes_tl_bulk_allocated) { 31 num_bytes = RoundUp(num_bytes, kAlignment); 32 mirror::Object* ret = AllocNonvirtual(num_bytes); 33 if (LIKELY(ret != nullptr)) { 34 *bytes_allocated = num_bytes; 35 if (usable_size != nullptr) { 36 *usable_size = num_bytes; 37 } 38 *bytes_tl_bulk_allocated = num_bytes; 39 } 40 return ret; 41 } 42 43 inline mirror::Object* BumpPointerSpace::AllocThreadUnsafe(Thread* self, size_t num_bytes, 44 size_t* bytes_allocated, 45 size_t* usable_size, 46 size_t* bytes_tl_bulk_allocated) { 47 Locks::mutator_lock_->AssertExclusiveHeld(self); 48 num_bytes = RoundUp(num_bytes, kAlignment); 49 uint8_t* end = end_.LoadRelaxed(); 50 if (end + num_bytes > growth_end_) { 51 return nullptr; 52 } 53 mirror::Object* obj = reinterpret_cast<mirror::Object*>(end); 54 end_.StoreRelaxed(end + num_bytes); 55 *bytes_allocated = num_bytes; 56 // Use the CAS free versions as an optimization. 57 objects_allocated_.StoreRelaxed(objects_allocated_.LoadRelaxed() + 1); 58 bytes_allocated_.StoreRelaxed(bytes_allocated_.LoadRelaxed() + num_bytes); 59 if (UNLIKELY(usable_size != nullptr)) { 60 *usable_size = num_bytes; 61 } 62 *bytes_tl_bulk_allocated = num_bytes; 63 return obj; 64 } 65 66 inline mirror::Object* BumpPointerSpace::AllocNonvirtualWithoutAccounting(size_t num_bytes) { 67 DCHECK_ALIGNED(num_bytes, kAlignment); 68 uint8_t* old_end; 69 uint8_t* new_end; 70 do { 71 old_end = end_.LoadRelaxed(); 72 new_end = old_end + num_bytes; 73 // If there is no more room in the region, we are out of memory. 74 if (UNLIKELY(new_end > growth_end_)) { 75 return nullptr; 76 } 77 } while (!end_.CompareExchangeWeakSequentiallyConsistent(old_end, new_end)); 78 return reinterpret_cast<mirror::Object*>(old_end); 79 } 80 81 inline mirror::Object* BumpPointerSpace::AllocNonvirtual(size_t num_bytes) { 82 mirror::Object* ret = AllocNonvirtualWithoutAccounting(num_bytes); 83 if (ret != nullptr) { 84 objects_allocated_.FetchAndAddSequentiallyConsistent(1); 85 bytes_allocated_.FetchAndAddSequentiallyConsistent(num_bytes); 86 } 87 return ret; 88 } 89 90 } // namespace space 91 } // namespace gc 92 } // namespace art 93 94 #endif // ART_RUNTIME_GC_SPACE_BUMP_POINTER_SPACE_INL_H_ 95
