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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_RUNTIME_GC_SPACE_ZYGOTE_SPACE_H_
#define ART_RUNTIME_GC_SPACE_ZYGOTE_SPACE_H_
#include "base/mem_map.h"
#include "gc/accounting/space_bitmap.h"
#include "malloc_space.h"
namespace art {
namespace gc {
namespace space {
// A zygote space is a space which you cannot allocate into or free from.
class ZygoteSpace final : public ContinuousMemMapAllocSpace {
public:
// Returns the remaining storage in the out_map field.
static ZygoteSpace* Create(const std::string& name,
MemMap&& mem_map,
accounting::ContinuousSpaceBitmap&& live_bitmap,
accounting::ContinuousSpaceBitmap&& mark_bitmap)
REQUIRES_SHARED(Locks::mutator_lock_);
// In PreZygoteFork() we set mark-bit of all live objects to avoid page
// getting dirtied due to it.
void SetMarkBitInLiveObjects();
void Dump(std::ostream& os) const override;
SpaceType GetType() const override {
return kSpaceTypeZygoteSpace;
}
ZygoteSpace* AsZygoteSpace() override {
return this;
}
mirror::Object* Alloc(Thread* self, size_t num_bytes, size_t* bytes_allocated,
size_t* usable_size, size_t* bytes_tl_bulk_allocated) override;
size_t AllocationSize(mirror::Object* obj, size_t* usable_size) override;
size_t Free(Thread* self, mirror::Object* ptr) override;
size_t FreeList(Thread* self, size_t num_ptrs, mirror::Object** ptrs) override;
// ZygoteSpaces don't have thread local state.
size_t RevokeThreadLocalBuffers(art::Thread*) override {
return 0U;
}
size_t RevokeAllThreadLocalBuffers() override {
return 0U;
}
uint64_t GetBytesAllocated() override {
return Size();
}
uint64_t GetObjectsAllocated() override {
return objects_allocated_.load();
}
void Clear() override;
bool CanMoveObjects() const override {
return false;
}
bool LogFragmentationAllocFailure(std::ostream& os, size_t failed_alloc_bytes) override
REQUIRES_SHARED(Locks::mutator_lock_);
protected:
accounting::ContinuousSpaceBitmap::SweepCallback* GetSweepCallback() override {
return &SweepCallback;
}
private:
ZygoteSpace(const std::string& name, MemMap&& mem_map, size_t objects_allocated);
static void SweepCallback(size_t num_ptrs, mirror::Object** ptrs, void* arg);
AtomicInteger objects_allocated_;
friend class Space;
DISALLOW_COPY_AND_ASSIGN(ZygoteSpace);
};
} // namespace space
} // namespace gc
} // namespace art
#endif // ART_RUNTIME_GC_SPACE_ZYGOTE_SPACE_H_