author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
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/* |
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* Copyright (C) 2008, 2009 Apple Inc. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "config.h" |
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#include "Collector.h" |
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#ifndef CollectorHeapIterator_h |
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#define CollectorHeapIterator_h |
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namespace JSC { |
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class CollectorHeapIterator { |
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public: |
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bool operator!=(const CollectorHeapIterator& other); |
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JSCell* operator*() const; |
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protected: |
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CollectorHeapIterator(CollectorHeap&, size_t startBlock, size_t startCell); |
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void advance(size_t max); |
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CollectorHeap& m_heap; |
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size_t m_block; |
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size_t m_cell; |
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}; |
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class LiveObjectIterator : public CollectorHeapIterator { |
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public: |
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LiveObjectIterator(CollectorHeap&, size_t startBlock, size_t startCell = 0); |
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LiveObjectIterator& operator++(); |
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}; |
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class DeadObjectIterator : public CollectorHeapIterator { |
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public: |
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DeadObjectIterator(CollectorHeap&, size_t startBlock, size_t startCell = 0); |
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DeadObjectIterator& operator++(); |
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}; |
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class ObjectIterator : public CollectorHeapIterator { |
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public: |
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ObjectIterator(CollectorHeap&, size_t startBlock, size_t startCell = 0); |
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ObjectIterator& operator++(); |
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}; |
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inline CollectorHeapIterator::CollectorHeapIterator(CollectorHeap& heap, size_t startBlock, size_t startCell) |
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: m_heap(heap) |
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, m_block(startBlock) |
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, m_cell(startCell) |
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} |
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inline bool CollectorHeapIterator::operator!=(const CollectorHeapIterator& other) |
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{ |
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return m_block != other.m_block || m_cell != other.m_cell; |
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} |
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inline JSCell* CollectorHeapIterator::operator*() const |
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{ |
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return reinterpret_cast<JSCell*>(m_heap.blocks[m_block]->cells + m_cell); |
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} |
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// Iterators advance up to the next-to-last -- and not the last -- cell in a |
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// block, since the last cell is a dummy sentinel. |
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inline void CollectorHeapIterator::advance(size_t max) |
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++m_cell; |
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if (m_cell == max) { |
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m_cell = 0; |
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++m_block; |
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} |
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} |
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inline LiveObjectIterator::LiveObjectIterator(CollectorHeap& heap, size_t startBlock, size_t startCell) |
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: CollectorHeapIterator(heap, startBlock, startCell - 1) |
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{ |
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++(*this); |
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} |
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inline LiveObjectIterator& LiveObjectIterator::operator++() |
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{ |
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advance(HeapConstants::cellsPerBlock - 1); |
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if (m_block < m_heap.nextBlock || (m_block == m_heap.nextBlock && m_cell < m_heap.nextCell)) |
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return *this; |
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while (m_block < m_heap.usedBlocks && !m_heap.blocks[m_block]->marked.get(m_cell)) |
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advance(HeapConstants::cellsPerBlock - 1); |
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return *this; |
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} |
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inline DeadObjectIterator::DeadObjectIterator(CollectorHeap& heap, size_t startBlock, size_t startCell) |
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: CollectorHeapIterator(heap, startBlock, startCell - 1) |
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{ |
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++(*this); |
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} |
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inline DeadObjectIterator& DeadObjectIterator::operator++() |
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do { |
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advance(HeapConstants::cellsPerBlock - 1); |
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ASSERT(m_block > m_heap.nextBlock || (m_block == m_heap.nextBlock && m_cell >= m_heap.nextCell)); |
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} while (m_block < m_heap.usedBlocks && m_heap.blocks[m_block]->marked.get(m_cell)); |
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return *this; |
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} |
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inline ObjectIterator::ObjectIterator(CollectorHeap& heap, size_t startBlock, size_t startCell) |
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: CollectorHeapIterator(heap, startBlock, startCell - 1) |
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{ |
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++(*this); |
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} |
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inline ObjectIterator& ObjectIterator::operator++() |
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{ |
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advance(HeapConstants::cellsPerBlock - 1); |
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return *this; |
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} |
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} // namespace JSC |
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#endif // CollectorHeapIterator_h |