CollectorHeapIterator.h [plain text]
#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);
}
}
#endif // CollectorHeapIterator_h