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      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       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, 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.
     58   size_t RevokeThreadLocalBuffers(art::Thread*) OVERRIDE {
     59     return 0U;
     60   }
     61   size_t RevokeAllThreadLocalBuffers() OVERRIDE {
     62     return 0U;
     63   }
     64 
     65   uint64_t GetBytesAllocated() {
     66     return Size();
     67   }
     68 
     69   uint64_t GetObjectsAllocated() {
     70     return objects_allocated_.LoadSequentiallyConsistent();
     71   }
     72 
     73   void Clear() OVERRIDE;
     74 
     75   bool CanMoveObjects() const OVERRIDE {
     76     return false;
     77   }
     78 
     79   void LogFragmentationAllocFailure(std::ostream& os, size_t failed_alloc_bytes) OVERRIDE
     80       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
     81 
     82  protected:
     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