1/*
2 * Copyright (C) 2013 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef HandleBlock_h
27#define HandleBlock_h
28
29#include <wtf/DoublyLinkedList.h>
30
31namespace JSC {
32
33class HandleSet;
34class HandleNode;
35
36class HandleBlock : public DoublyLinkedListNode<HandleBlock> {
37 friend class WTF::DoublyLinkedListNode<HandleBlock>;
38public:
39 static HandleBlock* create(HandleSet*);
40 static void destroy(HandleBlock*);
41 static HandleBlock* blockFor(HandleNode*);
42
43 static const size_t blockSize = 4 * KB;
44
45 HandleSet* handleSet();
46
47 HandleNode* nodes();
48 HandleNode* nodeAtIndex(unsigned);
49 unsigned nodeCapacity();
50
51private:
52 HandleBlock(HandleSet*);
53
54 char* payload();
55 char* payloadEnd();
56
57 static const size_t s_blockMask = ~(blockSize - 1);
58
59 HandleBlock* m_prev;
60 HandleBlock* m_next;
61 HandleSet* m_handleSet;
62};
63
64inline HandleBlock* HandleBlock::blockFor(HandleNode* node)
65{
66 return reinterpret_cast<HandleBlock*>(reinterpret_cast<size_t>(node) & s_blockMask);
67}
68
69inline HandleSet* HandleBlock::handleSet()
70{
71 return m_handleSet;
72}
73
74} // namespace JSC
75
76#endif // HandleBlock_h
77