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 "base/bit_utils.h" 21 #include "bump_pointer_space.h" 22 23 namespace art { 24 namespace gc { 25 namespace space { 26 27 inline mirror::Object* BumpPointerSpace::Alloc(Thread*, size_t num_bytes, size_t* bytes_allocated, 28 size_t* usable_size, 29 size_t* bytes_tl_bulk_allocated) { 30 num_bytes = RoundUp(num_bytes, kAlignment); 31 mirror::Object* ret = AllocNonvirtual(num_bytes); 32 if (LIKELY(ret != nullptr)) { 33 *bytes_allocated = num_bytes; 34 if (usable_size != nullptr) { 35 *usable_size = num_bytes; 36 } 37 *bytes_tl_bulk_allocated = num_bytes; 38 } 39 return ret; 40 } 41 42 inline mirror::Object* BumpPointerSpace::AllocThreadUnsafe(Thread* self, size_t num_bytes, 43 size_t* bytes_allocated, 44 size_t* usable_size, 45 size_t* bytes_tl_bulk_allocated) { 46 Locks::mutator_lock_->AssertExclusiveHeld(self); 47 num_bytes = RoundUp(num_bytes, kAlignment); 48 uint8_t* end = end_.LoadRelaxed(); 49 if (end + num_bytes > growth_end_) { 50 return nullptr; 51 } 52 mirror::Object* obj = reinterpret_cast<mirror::Object*>(end); 53 end_.StoreRelaxed(end + num_bytes); 54 *bytes_allocated = num_bytes; 55 // Use the CAS free versions as an optimization. 56 objects_allocated_.StoreRelaxed(objects_allocated_.LoadRelaxed() + 1); 57 bytes_allocated_.StoreRelaxed(bytes_allocated_.LoadRelaxed() + num_bytes); 58 if (UNLIKELY(usable_size != nullptr)) { 59 *usable_size = num_bytes; 60 } 61 *bytes_tl_bulk_allocated = num_bytes; 62 return obj; 63 } 64 65 inline mirror::Object* BumpPointerSpace::AllocNonvirtualWithoutAccounting(size_t num_bytes) { 66 DCHECK(IsAligned<kAlignment>(num_bytes)); 67 uint8_t* old_end; 68 uint8_t* new_end; 69 do { 70 old_end = end_.LoadRelaxed(); 71 new_end = old_end + num_bytes; 72 // If there is no more room in the region, we are out of memory. 73 if (UNLIKELY(new_end > growth_end_)) { 74 return nullptr; 75 } 76 } while (!end_.CompareExchangeWeakSequentiallyConsistent(old_end, new_end)); 77 return reinterpret_cast<mirror::Object*>(old_end); 78 } 79 80 inline mirror::Object* BumpPointerSpace::AllocNonvirtual(size_t num_bytes) { 81 mirror::Object* ret = AllocNonvirtualWithoutAccounting(num_bytes); 82 if (ret != nullptr) { 83 objects_allocated_.FetchAndAddSequentiallyConsistent(1); 84 bytes_allocated_.FetchAndAddSequentiallyConsistent(num_bytes); 85 } 86 return ret; 87 } 88 89 inline size_t BumpPointerSpace::AllocationSizeNonvirtual(mirror::Object* obj, size_t* usable_size) 90 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 91 size_t num_bytes = obj->SizeOf(); 92 if (usable_size != nullptr) { 93 *usable_size = RoundUp(num_bytes, kAlignment); 94 } 95 return num_bytes; 96 } 97 98 } // namespace space 99 } // namespace gc 100 } // namespace art 101 102 #endif // ART_RUNTIME_GC_SPACE_BUMP_POINTER_SPACE_INL_H_ 103
