rosalloc_space.h revision ef7d42fca18c16fbaf103822ad16f23246e2905d 
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(mirror::Object* obj);
51  virtual size_t Free(Thread* self, mirror::Object* ptr)
52      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
53  virtual size_t FreeList(Thread* self, size_t num_ptrs, mirror::Object** ptrs)
54      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
55
56  mirror::Object* AllocNonvirtual(Thread* self, size_t num_bytes, size_t* bytes_allocated);
57
58  size_t AllocationSizeNonvirtual(mirror::Object* obj)
59      NO_THREAD_SAFETY_ANALYSIS {
60    // TODO: NO_THREAD_SAFETY_ANALYSIS because SizeOf() requires that mutator_lock is held.
61    void* obj_ptr = const_cast<void*>(reinterpret_cast<const void*>(obj));
62    // obj is a valid object. Use its class in the header to get the size.
63    size_t size = obj->SizeOf();
64    size_t size_by_size = rosalloc_->UsableSize(size);
65    if (kIsDebugBuild) {
66      size_t size_by_ptr = rosalloc_->UsableSize(obj_ptr);
67      if (size_by_size != size_by_ptr) {
68        LOG(INFO) << "Found a bad sized obj of size " << size
69                  << " at " << std::hex << reinterpret_cast<intptr_t>(obj_ptr) << std::dec
70                  << " size_by_size=" << size_by_size << " size_by_ptr=" << size_by_ptr;
71      }
72      DCHECK_EQ(size_by_size, size_by_ptr);
73    }
74    return size_by_size;
75  }
76
77  art::gc::allocator::RosAlloc* GetRosAlloc() {
78    return rosalloc_;
79  }
80
81  size_t Trim();
82  void Walk(WalkCallback callback, void* arg) LOCKS_EXCLUDED(lock_);
83  size_t GetFootprint();
84  size_t GetFootprintLimit();
85  void SetFootprintLimit(size_t limit);
86
87  virtual void Clear();
88  MallocSpace* CreateInstance(const std::string& name, MemMap* mem_map, void* allocator,
89                              byte* begin, byte* end, byte* limit, size_t growth_limit);
90
91  uint64_t GetBytesAllocated();
92  uint64_t GetObjectsAllocated();
93
94  void RevokeThreadLocalBuffers(Thread* thread);
95  void RevokeAllThreadLocalBuffers();
96
97  // Returns the class of a recently freed object.
98  mirror::Class* FindRecentFreedObject(const mirror::Object* obj);
99
100  virtual bool IsRosAllocSpace() const {
101    return true;
102  }
103  virtual RosAllocSpace* AsRosAllocSpace() {
104    return this;
105  }
106
107 protected:
108  RosAllocSpace(const std::string& name, MemMap* mem_map, allocator::RosAlloc* rosalloc,
109                byte* begin, byte* end, byte* limit, size_t growth_limit);
110
111 private:
112  mirror::Object* AllocWithoutGrowthLocked(Thread* self, size_t num_bytes, size_t* bytes_allocated);
113
114  void* CreateAllocator(void* base, size_t morecore_start, size_t initial_size, bool low_memory_mode) {
115    return CreateRosAlloc(base, morecore_start, initial_size, low_memory_mode);
116  }
117  static allocator::RosAlloc* CreateRosAlloc(void* base, size_t morecore_start, size_t initial_size,
118                                             bool low_memory_mode);
119
120  void InspectAllRosAlloc(void (*callback)(void *start, void *end, size_t num_bytes, void* callback_arg),
121                          void* arg)
122      LOCKS_EXCLUDED(Locks::runtime_shutdown_lock_, Locks::thread_list_lock_);
123
124  // Underlying rosalloc.
125  art::gc::allocator::RosAlloc* const rosalloc_;
126
127  // A rosalloc pointer used for allocation. Equals to what rosalloc_
128  // points to or nullptr after InvalidateAllocator() is called.
129  art::gc::allocator::RosAlloc* rosalloc_for_alloc_;
130
131  friend class collector::MarkSweep;
132
133  DISALLOW_COPY_AND_ASSIGN(RosAllocSpace);
134};
135
136}  // namespace space
137}  // namespace gc
138}  // namespace art
139
140#endif  // ART_RUNTIME_GC_SPACE_ROSALLOC_SPACE_H_
141