1/*
2 * Copyright (C) 2010 Google 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 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef PODArena_h
27#define PODArena_h
28
29#include <stdint.h>
30#include <wtf/Assertions.h>
31#include <wtf/FastMalloc.h>
32#include <wtf/Noncopyable.h>
33#include <wtf/OwnPtr.h>
34#include <wtf/PassOwnPtr.h>
35#include <wtf/RefCounted.h>
36#include <wtf/Vector.h>
37
38namespace WebCore {
39
40// An arena which allocates only Plain Old Data (POD), or classes and
41// structs bottoming out in Plain Old Data. NOTE: the constructors of
42// the objects allocated in this arena are called, but _not_ their
43// destructors.
44
45class PODArena : public RefCounted<PODArena> {
46protected:
47    virtual ~PODArena() { }
48    friend class WTF::RefCounted<PODArena>;
49
50    // Returns the alignment requirement for classes and structs on the
51    // current platform.
52    template <class T> static size_t minAlignment()
53    {
54        return std::alignment_of<T>::value;
55    }
56
57    // Rounds up the given allocation size to the specified alignment.
58    size_t roundUp(size_t size, size_t alignment)
59    {
60        ASSERT(!(alignment % 2));
61        return (size + alignment - 1) & ~(alignment - 1);
62    }
63};
64
65} // namespace WebCore
66
67#endif // PODArena_h
68