1/*
2 * Copyright (C) 2014 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_ZYGOTE_SPACE_H_
18#define ART_RUNTIME_GC_SPACE_ZYGOTE_SPACE_H_
19
20#include "gc/accounting/space_bitmap.h"
21#include "malloc_space.h"
22#include "mem_map.h"
23
24namespace art {
25namespace gc {
26
27namespace space {
28
29// An zygote space is a space which you cannot allocate into or free from.
30class ZygoteSpace FINAL : public ContinuousMemMapAllocSpace {
31 public:
32  // Returns the remaining storage in the out_map field.
33  static ZygoteSpace* Create(const std::string& name, MemMap* mem_map,
34                             accounting::ContinuousSpaceBitmap* live_bitmap,
35                             accounting::ContinuousSpaceBitmap* mark_bitmap)
36      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
37
38  void Dump(std::ostream& os) const;
39
40  SpaceType GetType() const OVERRIDE {
41    return kSpaceTypeZygoteSpace;
42  }
43
44  ZygoteSpace* AsZygoteSpace() OVERRIDE {
45    return this;
46  }
47
48  mirror::Object* Alloc(Thread* self, size_t num_bytes, size_t* bytes_allocated,
49                        size_t* usable_size) OVERRIDE;
50
51  size_t AllocationSize(mirror::Object* obj, size_t* usable_size) OVERRIDE;
52
53  size_t Free(Thread* self, mirror::Object* ptr) OVERRIDE;
54
55  size_t FreeList(Thread* self, size_t num_ptrs, mirror::Object** ptrs) OVERRIDE;
56
57  // ZygoteSpaces don't have thread local state.
58  void RevokeThreadLocalBuffers(art::Thread*) OVERRIDE {
59  }
60  void RevokeAllThreadLocalBuffers() OVERRIDE {
61  }
62
63  uint64_t GetBytesAllocated() {
64    return Size();
65  }
66
67  uint64_t GetObjectsAllocated() {
68    return objects_allocated_.LoadSequentiallyConsistent();
69  }
70
71  void Clear() OVERRIDE;
72
73  bool CanMoveObjects() const OVERRIDE {
74    return false;
75  }
76
77  void LogFragmentationAllocFailure(std::ostream& os, size_t failed_alloc_bytes) OVERRIDE
78      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
79
80 protected:
81  virtual accounting::ContinuousSpaceBitmap::SweepCallback* GetSweepCallback() {
82    return &SweepCallback;
83  }
84
85 private:
86  ZygoteSpace(const std::string& name, MemMap* mem_map, size_t objects_allocated);
87  static void SweepCallback(size_t num_ptrs, mirror::Object** ptrs, void* arg);
88
89  AtomicInteger objects_allocated_;
90
91  friend class Space;
92  DISALLOW_COPY_AND_ASSIGN(ZygoteSpace);
93};
94
95}  // namespace space
96}  // namespace gc
97}  // namespace art
98
99#endif  // ART_RUNTIME_GC_SPACE_ZYGOTE_SPACE_H_
100