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 WTF_ALIGN_OF(T); 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