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