1 /*
2  * Copyright (c) 2022 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef ECMASCRIPT_MEM_HEAP_REGION_ALLOCATOR_H
17 #define ECMASCRIPT_MEM_HEAP_REGION_ALLOCATOR_H
18 
19 #include <atomic>
20 
21 #include "ecmascript/mem/mem.h"
22 
23 namespace panda::ecmascript {
24 class BaseHeap;
25 class Region;
26 class Space;
27 
28 class HeapRegionAllocator {
29 public:
30     HeapRegionAllocator() = default;
31     virtual ~HeapRegionAllocator() = default;
32 
33     Region *AllocateAlignedRegion(Space *space, size_t capacity, JSThread* thread, BaseHeap *heap,
34                                   bool isFresh = false);
35     void FreeRegion(Region *region, size_t cachedSize);
36 
IncreaseAnnoMemoryUsage(size_t bytes)37     void IncreaseAnnoMemoryUsage(size_t bytes)
38     {
39         size_t current = annoMemoryUsage_.fetch_add(bytes, std::memory_order_relaxed) + bytes;
40         size_t max = maxAnnoMemoryUsage_.load(std::memory_order_relaxed);
41         while (current > max && !maxAnnoMemoryUsage_.compare_exchange_weak(max, current, std::memory_order_relaxed)) {
42         }
43     }
44 
DecreaseAnnoMemoryUsage(size_t bytes)45     void DecreaseAnnoMemoryUsage(size_t bytes)
46     {
47         annoMemoryUsage_.fetch_sub(bytes, std::memory_order_relaxed);
48     }
49 
GetAnnoMemoryUsage() const50     size_t GetAnnoMemoryUsage() const
51     {
52         return annoMemoryUsage_.load(std::memory_order_relaxed);
53     }
54 
GetMaxAnnoMemoryUsage() const55     size_t GetMaxAnnoMemoryUsage() const
56     {
57         return maxAnnoMemoryUsage_.load(std::memory_order_relaxed);
58     }
59 
60 private:
61     NO_COPY_SEMANTIC(HeapRegionAllocator);
62     NO_MOVE_SEMANTIC(HeapRegionAllocator);
63 
64     std::atomic<size_t> annoMemoryUsage_ {0};
65     std::atomic<size_t> maxAnnoMemoryUsage_ {0};
66 };
67 }  // namespace panda::ecmascript
68 
69 #endif  // ECMASCRIPT_MEM_HEAP_REGION_ALLOCATOR_H
70