rosalloc_space.h revision e48780b8278240dec2d3164512f7d3317a5495c1 
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);
42
43  virtual mirror::Object* AllocWithGrowth(Thread* self, size_t num_bytes,
44                                          size_t* bytes_allocated) LOCKS_EXCLUDED(lock_);
45  virtual mirror::Object* Alloc(Thread* self, size_t num_bytes, size_t* bytes_allocated);
46  virtual size_t AllocationSize(const mirror::Object* obj);
47  virtual size_t Free(Thread* self, mirror::Object* ptr);
48  virtual size_t FreeList(Thread* self, size_t num_ptrs, mirror::Object** ptrs);
49
50  mirror::Object* AllocNonvirtual(Thread* self, size_t num_bytes, size_t* bytes_allocated);
51
52  size_t AllocationSizeNonvirtual(const mirror::Object* obj)
53      NO_THREAD_SAFETY_ANALYSIS {
54    // TODO: NO_THREAD_SAFETY_ANALYSIS because SizeOf() requires that mutator_lock is held.
55    void* obj_ptr = const_cast<void*>(reinterpret_cast<const void*>(obj));
56    // obj is a valid object. Use its class in the header to get the size.
57    size_t size = obj->SizeOf();
58    size_t size_by_size = rosalloc_->UsableSize(size);
59    if (kIsDebugBuild) {
60      size_t size_by_ptr = rosalloc_->UsableSize(obj_ptr);
61      if (size_by_size != size_by_ptr) {
62        LOG(INFO) << "Found a bad sized obj of size " << size
63                  << " at " << std::hex << reinterpret_cast<intptr_t>(obj_ptr) << std::dec
64                  << " size_by_size=" << size_by_size << " size_by_ptr=" << size_by_ptr;
65      }
66      DCHECK_EQ(size_by_size, size_by_ptr);
67    }
68    return size_by_size;
69  }
70
71  art::gc::allocator::RosAlloc* GetRosAlloc() {
72    return rosalloc_;
73  }
74
75  size_t Trim();
76  void Walk(WalkCallback callback, void* arg) LOCKS_EXCLUDED(lock_);
77  size_t GetFootprint();
78  size_t GetFootprintLimit();
79  void SetFootprintLimit(size_t limit);
80
81  MallocSpace* CreateInstance(const std::string& name, MemMap* mem_map, void* allocator,
82                              byte* begin, byte* end, byte* limit, size_t growth_limit);
83
84  uint64_t GetBytesAllocated();
85  uint64_t GetObjectsAllocated();
86
87  void RevokeThreadLocalBuffers(Thread* thread);
88  void RevokeAllThreadLocalBuffers();
89
90  // Returns the class of a recently freed object.
91  mirror::Class* FindRecentFreedObject(const mirror::Object* obj);
92
93  virtual void InvalidateAllocator() {
94    rosalloc_for_alloc_ = NULL;
95  }
96
97  virtual bool IsRosAllocSpace() const {
98    return true;
99  }
100  virtual RosAllocSpace* AsRosAllocSpace() {
101    return this;
102  }
103
104 protected:
105  RosAllocSpace(const std::string& name, MemMap* mem_map, allocator::RosAlloc* rosalloc,
106                byte* begin, byte* end, byte* limit, size_t growth_limit);
107
108 private:
109  mirror::Object* AllocWithoutGrowthLocked(Thread* self, size_t num_bytes, size_t* bytes_allocated);
110
111  void* CreateAllocator(void* base, size_t morecore_start, size_t initial_size) {
112    return CreateRosAlloc(base, morecore_start, initial_size);
113  }
114  static allocator::RosAlloc* CreateRosAlloc(void* base, size_t morecore_start, size_t initial_size);
115
116
117  void InspectAllRosAlloc(void (*callback)(void *start, void *end, size_t num_bytes, void* callback_arg),
118                          void* arg)
119      LOCKS_EXCLUDED(Locks::runtime_shutdown_lock_, Locks::thread_list_lock_);
120
121  // Underlying rosalloc.
122  art::gc::allocator::RosAlloc* const rosalloc_;
123
124  // A rosalloc pointer used for allocation. Equals to what rosalloc_
125  // points to or nullptr after InvalidateAllocator() is called.
126  art::gc::allocator::RosAlloc* rosalloc_for_alloc_;
127
128  friend class collector::MarkSweep;
129
130  DISALLOW_COPY_AND_ASSIGN(RosAllocSpace);
131};
132
133}  // namespace space
134}  // namespace gc
135}  // namespace art
136
137#endif  // ART_RUNTIME_GC_SPACE_ROSALLOC_SPACE_H_
138