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/*
* Copyright (C) 2008, 2009 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.
*/
#include "config.h"
#include "Collector.h"
#ifndef CollectorHeapIterator_h
#define CollectorHeapIterator_h
namespace JSC {
template <HeapType heapType> class CollectorHeapIterator {
public:
CollectorHeapIterator(CollectorBlock** block, CollectorBlock** endBlock);
bool operator!=(const CollectorHeapIterator<heapType>& other) { return m_block != other.m_block || m_cell != other.m_cell; }
CollectorHeapIterator<heapType>& operator++();
JSCell* operator*() const;
private:
typedef typename HeapConstants<heapType>::Block Block;
typedef typename HeapConstants<heapType>::Cell Cell;
Block** m_block;
Block** m_endBlock;
Cell* m_cell;
Cell* m_endCell;
};
template <HeapType heapType>
CollectorHeapIterator<heapType>::CollectorHeapIterator(CollectorBlock** block, CollectorBlock** endBlock)
: m_block(reinterpret_cast<Block**>(block))
, m_endBlock(reinterpret_cast<Block**>(endBlock))
, m_cell(m_block == m_endBlock ? 0 : (*m_block)->cells)
, m_endCell(m_block == m_endBlock ? 0 : (*m_block)->cells + HeapConstants<heapType>::cellsPerBlock)
{
if (m_cell && m_cell->u.freeCell.zeroIfFree == 0)
++*this;
}
template <HeapType heapType>
CollectorHeapIterator<heapType>& CollectorHeapIterator<heapType>::operator++()
{
do {
for (++m_cell; m_cell != m_endCell; ++m_cell)
if (m_cell->u.freeCell.zeroIfFree != 0) {
return *this;
}
if (++m_block != m_endBlock) {
m_cell = (*m_block)->cells;
m_endCell = (*m_block)->cells + HeapConstants<heapType>::cellsPerBlock;
}
} while(m_block != m_endBlock);
m_cell = 0;
return *this;
}
template <HeapType heapType>
JSCell* CollectorHeapIterator<heapType>::operator*() const
{
return reinterpret_cast<JSCell*>(m_cell);
}
} // namespace JSC
#endif // CollectorHeapIterator_h
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