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/*
* Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifndef MarkedSpace_h
#define MarkedSpace_h
#include "MachineStackMarker.h"
#include "MarkedBlock.h"
#include "PageAllocationAligned.h"
#include <wtf/Bitmap.h>
#include <wtf/FixedArray.h>
#include <wtf/HashCountedSet.h>
#include <wtf/Noncopyable.h>
#include <wtf/Vector.h>
namespace JSC {
class Heap;
class JSCell;
class JSGlobalData;
class LiveObjectIterator;
class MarkStack;
class WeakGCHandle;
struct CollectorHeap {
CollectorHeap()
: nextBlock(0)
, nextCell(0)
{
}
MarkedBlock* collectorBlock(size_t index) const
{
return blocks[index];
}
size_t nextBlock;
size_t nextCell;
Vector<MarkedBlock*> blocks;
};
class MarkedSpace {
WTF_MAKE_NONCOPYABLE(MarkedSpace);
public:
static Heap* heap(JSCell*);
static bool isMarked(const JSCell*);
static bool testAndSetMarked(const JSCell*);
static void setMarked(const JSCell*);
MarkedSpace(JSGlobalData*);
void destroy();
JSGlobalData* globalData() { return m_globalData; }
size_t highWaterMark() { return m_highWaterMark; }
void setHighWaterMark(size_t highWaterMark) { m_highWaterMark = highWaterMark; }
void* allocate(size_t);
void clearMarks();
void markRoots();
void reset();
void sweep();
void shrink();
size_t size() const;
size_t capacity() const;
size_t objectCount() const;
bool contains(const void*);
template<typename Functor> void forEach(Functor&);
private:
NEVER_INLINE MarkedBlock* allocateBlock();
NEVER_INLINE void freeBlock(size_t);
void clearMarks(MarkedBlock*);
CollectorHeap m_heap;
size_t m_waterMark;
size_t m_highWaterMark;
JSGlobalData* m_globalData;
};
inline Heap* MarkedSpace::heap(JSCell* cell)
{
return MarkedBlock::blockFor(cell)->heap();
}
inline bool MarkedSpace::isMarked(const JSCell* cell)
{
return MarkedBlock::blockFor(cell)->isMarked(cell);
}
inline bool MarkedSpace::testAndSetMarked(const JSCell* cell)
{
return MarkedBlock::blockFor(cell)->testAndSetMarked(cell);
}
inline void MarkedSpace::setMarked(const JSCell* cell)
{
MarkedBlock::blockFor(cell)->setMarked(cell);
}
inline bool MarkedSpace::contains(const void* x)
{
if (!MarkedBlock::isCellAligned(x))
return false;
MarkedBlock* block = MarkedBlock::blockFor(x);
if (!block)
return false;
size_t size = m_heap.blocks.size();
for (size_t i = 0; i < size; i++) {
if (block != m_heap.collectorBlock(i))
continue;
// x is a pointer into the heap. Now, verify that the cell it
// points to is live. (If the cell is dead, we must not mark it,
// since that would revive it in a zombie state.)
return block->isMarked(x);
}
return false;
}
template <typename Functor> inline void MarkedSpace::forEach(Functor& functor)
{
for (size_t i = 0; i < m_heap.blocks.size(); ++i)
m_heap.collectorBlock(i)->forEach(functor);
}
} // namespace JSC
#endif // MarkedSpace_h
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