rosalloc_space.h revision e6da9af8dfe0a3e3fbc2be700554f6478380e7b9 
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_ROSALLOC_SPACE_H_
18#define ART_RUNTIME_GC_SPACE_ROSALLOC_SPACE_H_
19
20#include "gc/allocator/rosalloc.h"
21#include "malloc_space.h"
22#include "space.h"
23
24namespace art {
25namespace gc {
26
27namespace collector {
28  class MarkSweep;
29}  // namespace collector
30
31namespace space {
32
33// An alloc space is a space where objects may be allocated and garbage collected.
34class RosAllocSpace : public MallocSpace {
35 public:
36  // Create a RosAllocSpace with the requested sizes. The requested
37  // base address is not guaranteed to be granted, if it is required,
38  // the caller should call Begin on the returned space to confirm the
39  // request was granted.
40  static RosAllocSpace* Create(const std::string& name, size_t initial_size, size_t growth_limit,
41                               size_t capacity, byte* requested_begin, bool low_memory_mode);
42  static RosAllocSpace* CreateFromMemMap(MemMap* mem_map, const std::string& name,
43                                         size_t starting_size, size_t initial_size,
44                                         size_t growth_limit, size_t capacity,
45                                         bool low_memory_mode);
46
47  virtual mirror::Object* AllocWithGrowth(Thread* self, size_t num_bytes,
48                                          size_t* bytes_allocated) LOCKS_EXCLUDED(lock_);
49  virtual mirror::Object* Alloc(Thread* self, size_t num_bytes, size_t* bytes_allocated);
50  virtual size_t AllocationSize(const mirror::Object* obj);
51  virtual size_t Free(Thread* self, mirror::Object* ptr);
52  virtual size_t FreeList(Thread* self, size_t num_ptrs, mirror::Object** ptrs);
53
54  mirror::Object* AllocNonvirtual(Thread* self, size_t num_bytes, size_t* bytes_allocated);
55
56  size_t AllocationSizeNonvirtual(const mirror::Object* obj)
57      NO_THREAD_SAFETY_ANALYSIS {
58    // TODO: NO_THREAD_SAFETY_ANALYSIS because SizeOf() requires that mutator_lock is held.
59    void* obj_ptr = const_cast<void*>(reinterpret_cast<const void*>(obj));
60    // obj is a valid object. Use its class in the header to get the size.
61    size_t size = obj->SizeOf();
62    size_t size_by_size = rosalloc_->UsableSize(size);
63    if (kIsDebugBuild) {
64      size_t size_by_ptr = rosalloc_->UsableSize(obj_ptr);
65      if (size_by_size != size_by_ptr) {
66        LOG(INFO) << "Found a bad sized obj of size " << size
67                  << " at " << std::hex << reinterpret_cast<intptr_t>(obj_ptr) << std::dec
68                  << " size_by_size=" << size_by_size << " size_by_ptr=" << size_by_ptr;
69      }
70      DCHECK_EQ(size_by_size, size_by_ptr);
71    }
72    return size_by_size;
73  }
74
75  art::gc::allocator::RosAlloc* GetRosAlloc() {
76    return rosalloc_;
77  }
78
79  size_t Trim();
80  void Walk(WalkCallback callback, void* arg) LOCKS_EXCLUDED(lock_);
81  size_t GetFootprint();
82  size_t GetFootprintLimit();
83  void SetFootprintLimit(size_t limit);
84
85  virtual void Clear();
86  MallocSpace* CreateInstance(const std::string& name, MemMap* mem_map, void* allocator,
87                              byte* begin, byte* end, byte* limit, size_t growth_limit);
88
89  uint64_t GetBytesAllocated();
90  uint64_t GetObjectsAllocated();
91
92  void RevokeThreadLocalBuffers(Thread* thread);
93  void RevokeAllThreadLocalBuffers();
94
95  // Returns the class of a recently freed object.
96  mirror::Class* FindRecentFreedObject(const mirror::Object* obj);
97
98  virtual void InvalidateAllocator() {
99    rosalloc_for_alloc_ = NULL;
100  }
101
102  virtual bool IsRosAllocSpace() const {
103    return true;
104  }
105  virtual RosAllocSpace* AsRosAllocSpace() {
106    return this;
107  }
108
109 protected:
110  RosAllocSpace(const std::string& name, MemMap* mem_map, allocator::RosAlloc* rosalloc,
111                byte* begin, byte* end, byte* limit, size_t growth_limit);
112
113 private:
114  mirror::Object* AllocWithoutGrowthLocked(Thread* self, size_t num_bytes, size_t* bytes_allocated);
115
116  void* CreateAllocator(void* base, size_t morecore_start, size_t initial_size, bool low_memory_mode) {
117    return CreateRosAlloc(base, morecore_start, initial_size, low_memory_mode);
118  }
119  static allocator::RosAlloc* CreateRosAlloc(void* base, size_t morecore_start, size_t initial_size,
120                                             bool low_memory_mode);
121
122  void InspectAllRosAlloc(void (*callback)(void *start, void *end, size_t num_bytes, void* callback_arg),
123                          void* arg)
124      LOCKS_EXCLUDED(Locks::runtime_shutdown_lock_, Locks::thread_list_lock_);
125
126  // Underlying rosalloc.
127  art::gc::allocator::RosAlloc* const rosalloc_;
128
129  // A rosalloc pointer used for allocation. Equals to what rosalloc_
130  // points to or nullptr after InvalidateAllocator() is called.
131  art::gc::allocator::RosAlloc* rosalloc_for_alloc_;
132
133  friend class collector::MarkSweep;
134
135  DISALLOW_COPY_AND_ASSIGN(RosAllocSpace);
136};
137
138}  // namespace space
139}  // namespace gc
140}  // namespace art
141
142#endif  // ART_RUNTIME_GC_SPACE_ROSALLOC_SPACE_H_
143