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 
24 namespace art {
25 namespace gc {
26 
27 namespace space {
28 
29 // An zygote space is a space which you cannot allocate into or free from.
30 class 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       REQUIRES_SHARED(Locks::mutator_lock_);
37 
38   void Dump(std::ostream& os) const;
39 
GetType()40   SpaceType GetType() const OVERRIDE {
41     return kSpaceTypeZygoteSpace;
42   }
43 
AsZygoteSpace()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, size_t* bytes_tl_bulk_allocated) 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.
RevokeThreadLocalBuffers(art::Thread *)58   size_t RevokeThreadLocalBuffers(art::Thread*) OVERRIDE {
59     return 0U;
60   }
RevokeAllThreadLocalBuffers()61   size_t RevokeAllThreadLocalBuffers() OVERRIDE {
62     return 0U;
63   }
64 
GetBytesAllocated()65   uint64_t GetBytesAllocated() {
66     return Size();
67   }
68 
GetObjectsAllocated()69   uint64_t GetObjectsAllocated() {
70     return objects_allocated_.LoadSequentiallyConsistent();
71   }
72 
73   void Clear() OVERRIDE;
74 
CanMoveObjects()75   bool CanMoveObjects() const OVERRIDE {
76     return false;
77   }
78 
79   void LogFragmentationAllocFailure(std::ostream& os, size_t failed_alloc_bytes) OVERRIDE
80       REQUIRES_SHARED(Locks::mutator_lock_);
81 
82  protected:
GetSweepCallback()83   virtual accounting::ContinuousSpaceBitmap::SweepCallback* GetSweepCallback() {
84     return &SweepCallback;
85   }
86 
87  private:
88   ZygoteSpace(const std::string& name, MemMap* mem_map, size_t objects_allocated);
89   static void SweepCallback(size_t num_ptrs, mirror::Object** ptrs, void* arg);
90 
91   AtomicInteger objects_allocated_;
92 
93   friend class Space;
94   DISALLOW_COPY_AND_ASSIGN(ZygoteSpace);
95 };
96 
97 }  // namespace space
98 }  // namespace gc
99 }  // namespace art
100 
101 #endif  // ART_RUNTIME_GC_SPACE_ZYGOTE_SPACE_H_
102