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/*
* Copyright (C) 2011 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CopiedSpace_h
#define CopiedSpace_h
#include "CopiedAllocator.h"
#include "HeapOperation.h"
#include "TinyBloomFilter.h"
#include <wtf/Assertions.h>
#include <wtf/CheckedBoolean.h>
#include <wtf/DoublyLinkedList.h>
#include <wtf/HashSet.h>
#include <wtf/Lock.h>
namespace JSC {
class Heap;
class CopiedBlock;
class CopiedSpace {
friend class CopyVisitor;
friend class Heap;
friend class SlotVisitor;
friend class JIT;
public:
CopiedSpace(Heap*);
~CopiedSpace();
void init();
CheckedBoolean tryAllocate(size_t, void**);
CheckedBoolean tryReallocate(void**, size_t, size_t);
CopiedAllocator& allocator() { return m_allocator; }
void didStartFullCollection();
template <HeapOperation collectionType>
void startedCopying();
void doneCopying();
bool isInCopyPhase() const { return m_inCopyingPhase; }
void pin(CopiedBlock*);
bool isPinned(void*);
bool contains(CopiedBlock*);
bool contains(void*, CopiedBlock*&);
void pinIfNecessary(void* pointer);
size_t size();
size_t capacity();
bool isPagedOut(double deadline);
bool shouldDoCopyPhase() const { return m_shouldDoCopyPhase; }
static CopiedBlock* blockFor(void*);
Heap* heap() const { return m_heap; }
size_t takeBytesRemovedFromOldSpaceDueToReallocation()
{
size_t result = 0;
std::swap(m_bytesRemovedFromOldSpaceDueToReallocation, result);
return result;
}
private:
static bool isOversize(size_t);
JS_EXPORT_PRIVATE CheckedBoolean tryAllocateSlowCase(size_t, void**);
CheckedBoolean tryAllocateOversize(size_t, void**);
CheckedBoolean tryReallocateOversize(void**, size_t, size_t);
void allocateBlock();
CopiedBlock* allocateBlockForCopyingPhase();
void doneFillingBlock(CopiedBlock*, CopiedBlock**);
void recycleEvacuatedBlock(CopiedBlock*, HeapOperation collectionType);
void recycleBorrowedBlock(CopiedBlock*);
Heap* m_heap;
CopiedAllocator m_allocator;
HashSet<CopiedBlock*> m_blockSet;
Lock m_toSpaceLock;
struct CopiedGeneration {
CopiedGeneration()
: toSpace(0)
, fromSpace(0)
{
}
DoublyLinkedList<CopiedBlock>* toSpace;
DoublyLinkedList<CopiedBlock>* fromSpace;
DoublyLinkedList<CopiedBlock> blocks1;
DoublyLinkedList<CopiedBlock> blocks2;
DoublyLinkedList<CopiedBlock> oversizeBlocks;
TinyBloomFilter blockFilter;
};
CopiedGeneration m_oldGen;
CopiedGeneration m_newGen;
bool m_inCopyingPhase;
bool m_shouldDoCopyPhase;
Lock m_loanedBlocksLock;
size_t m_numberOfLoanedBlocks;
size_t m_bytesRemovedFromOldSpaceDueToReallocation;
static const size_t s_maxAllocationSize = CopiedBlock::blockSize / 2;
static const size_t s_blockMask = ~(CopiedBlock::blockSize - 1);
};
} // namespace JSC
#endif
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