| /* |
| * Copyright (C) 2013-2019 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. AND ITS CONTRIBUTORS ``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 ITS 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. |
| */ |
| |
| #pragma once |
| |
| #include <wtf/DoublyLinkedList.h> |
| |
| namespace JSC { |
| |
| class HandleSet; |
| class HandleNode; |
| |
| class HandleBlock : public DoublyLinkedListNode<HandleBlock> { |
| friend class WTF::DoublyLinkedListNode<HandleBlock>; |
| public: |
| static HandleBlock* create(HandleSet*); |
| static void destroy(HandleBlock*); |
| static HandleBlock* blockFor(HandleNode*); |
| |
| static constexpr size_t blockSize = 4 * KB; |
| |
| HandleSet* handleSet(); |
| |
| HandleNode* nodes(); |
| HandleNode* nodeAtIndex(unsigned); |
| unsigned nodeCapacity(); |
| |
| private: |
| HandleBlock(HandleSet*); |
| |
| char* payload(); |
| char* payloadEnd(); |
| |
| static constexpr size_t s_blockMask = ~(blockSize - 1); |
| |
| HandleBlock* m_prev; |
| HandleBlock* m_next; |
| HandleSet* m_handleSet; |
| }; |
| |
| inline HandleBlock* HandleBlock::blockFor(HandleNode* node) |
| { |
| return reinterpret_cast<HandleBlock*>(reinterpret_cast<size_t>(node) & s_blockMask); |
| } |
| |
| inline HandleSet* HandleBlock::handleSet() |
| { |
| return m_handleSet; |
| } |
| |
| } // namespace JSC |