1/*
2 * Copyright (C) 2011 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. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef HeapBlock_h
27#define HeapBlock_h
28
29#include <wtf/DoublyLinkedList.h>
30#include <wtf/StdLibExtras.h>
31
32namespace JSC {
33
34enum AllocationEffort { AllocationCanFail, AllocationMustSucceed };
35
36class Region;
37
38template<typename T>
39class HeapBlock : public DoublyLinkedListNode<T> {
40    friend class WTF::DoublyLinkedListNode<T>;
41public:
42    static HeapBlock* destroy(HeapBlock* block) WARN_UNUSED_RETURN
43    {
44        static_cast<T*>(block)->~T();
45        return block;
46    }
47
48    HeapBlock(Region* region)
49        : DoublyLinkedListNode<T>()
50        , m_region(region)
51        , m_prev(0)
52        , m_next(0)
53    {
54        ASSERT(m_region);
55    }
56
57    Region* region() const { return m_region; }
58
59private:
60    Region* m_region;
61    T* m_prev;
62    T* m_next;
63};
64
65} // namespace JSC
66
67#endif
68