| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef ART_RUNTIME_GC_SPACE_BUMP_POINTER_SPACE_H_ |
| #define ART_RUNTIME_GC_SPACE_BUMP_POINTER_SPACE_H_ |
| |
| #include "space.h" |
| |
| namespace art { |
| namespace gc { |
| |
| namespace collector { |
| class MarkSweep; |
| } // namespace collector |
| |
| namespace space { |
| |
| // A bump pointer space is a space where objects may be allocated and garbage collected. |
| class BumpPointerSpace : public ContinuousMemMapAllocSpace { |
| public: |
| typedef void(*WalkCallback)(void *start, void *end, size_t num_bytes, void* callback_arg); |
| |
| SpaceType GetType() const { |
| return kSpaceTypeBumpPointerSpace; |
| } |
| |
| // Create a bump pointer space with the requested sizes. The requested base address is not |
| // guaranteed to be granted, if it is required, the caller should call Begin on the returned |
| // space to confirm the request was granted. |
| static BumpPointerSpace* Create(const std::string& name, size_t capacity, byte* requested_begin); |
| |
| // Allocate num_bytes, returns nullptr if the space is full. |
| virtual mirror::Object* Alloc(Thread* self, size_t num_bytes, size_t* bytes_allocated); |
| mirror::Object* AllocNonvirtual(size_t num_bytes); |
| |
| // Return the storage space required by obj. |
| virtual size_t AllocationSize(const mirror::Object* obj) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| // Nos unless we support free lists. |
| virtual size_t Free(Thread*, mirror::Object*) { |
| return 0; |
| } |
| virtual size_t FreeList(Thread*, size_t, mirror::Object**) { |
| return 0; |
| } |
| |
| size_t AllocationSizeNonvirtual(const mirror::Object* obj) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| return obj->SizeOf(); |
| } |
| |
| // Removes the fork time growth limit on capacity, allowing the application to allocate up to the |
| // maximum reserved size of the heap. |
| void ClearGrowthLimit() { |
| growth_end_ = Limit(); |
| } |
| |
| // Override capacity so that we only return the possibly limited capacity |
| size_t Capacity() const { |
| return growth_end_ - begin_; |
| } |
| |
| // The total amount of memory reserved for the space. |
| size_t NonGrowthLimitCapacity() const { |
| return GetMemMap()->Size(); |
| } |
| |
| accounting::SpaceBitmap* GetLiveBitmap() const { |
| return nullptr; |
| } |
| |
| accounting::SpaceBitmap* GetMarkBitmap() const { |
| return nullptr; |
| } |
| |
| // Clear the memory and reset the pointer to the start of the space. |
| void Clear(); |
| |
| void Dump(std::ostream& os) const; |
| |
| uint64_t GetBytesAllocated() { |
| return Size(); |
| } |
| |
| uint64_t GetObjectsAllocated() { |
| return num_objects_allocated_; |
| } |
| |
| uint64_t GetTotalBytesAllocated() { |
| return total_bytes_allocated_; |
| } |
| |
| uint64_t GetTotalObjectsAllocated() { |
| return total_objects_allocated_; |
| } |
| |
| bool Contains(const mirror::Object* obj) const { |
| const byte* byte_obj = reinterpret_cast<const byte*>(obj); |
| return byte_obj >= Begin() && byte_obj < End(); |
| } |
| |
| // TODO: Change this? Mainly used for compacting to a particular region of memory. |
| BumpPointerSpace(const std::string& name, byte* begin, byte* limit); |
| |
| // Return the object which comes after obj, while ensuring alignment. |
| static mirror::Object* GetNextObject(mirror::Object* obj) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| |
| virtual BumpPointerSpace* AsBumpPointerSpace() { |
| return this; |
| } |
| |
| // Object alignment within the space. |
| static constexpr size_t kAlignment = 8; |
| |
| protected: |
| BumpPointerSpace(const std::string& name, MemMap* mem_map); |
| |
| size_t InternalAllocationSize(const mirror::Object* obj); |
| mirror::Object* AllocWithoutGrowthLocked(size_t num_bytes, size_t* bytes_allocated) |
| EXCLUSIVE_LOCKS_REQUIRED(lock_); |
| |
| // Approximate number of bytes which have been allocated into the space. |
| AtomicInteger num_objects_allocated_; |
| AtomicInteger total_bytes_allocated_; |
| AtomicInteger total_objects_allocated_; |
| |
| byte* growth_end_; |
| |
| private: |
| friend class collector::MarkSweep; |
| DISALLOW_COPY_AND_ASSIGN(BumpPointerSpace); |
| }; |
| |
| } // namespace space |
| } // namespace gc |
| } // namespace art |
| |
| #endif // ART_RUNTIME_GC_SPACE_BUMP_POINTER_SPACE_H_ |