1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/yarr/PageBlock.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,90 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + *
1.7 + * ***** BEGIN LICENSE BLOCK *****
1.8 + * Copyright (C) 2010 Apple Inc. All rights reserved.
1.9 + *
1.10 + * Redistribution and use in source and binary forms, with or without
1.11 + * modification, are permitted provided that the following conditions
1.12 + * are met:
1.13 + * 1. Redistributions of source code must retain the above copyright
1.14 + * notice, this list of conditions and the following disclaimer.
1.15 + * 2. Redistributions in binary form must reproduce the above copyright
1.16 + * notice, this list of conditions and the following disclaimer in the
1.17 + * documentation and/or other materials provided with the distribution.
1.18 + *
1.19 + * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
1.20 + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
1.21 + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
1.22 + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
1.23 + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.24 + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.25 + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.26 + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.27 + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.28 + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
1.29 + * THE POSSIBILITY OF SUCH DAMAGE.
1.30 + *
1.31 + * ***** END LICENSE BLOCK ***** */
1.32 +
1.33 +#ifndef yarr_PageBlock_h
1.34 +#define yarr_PageBlock_h
1.35 +
1.36 +#include <stddef.h>
1.37 +#include <stdint.h>
1.38 +
1.39 +namespace WTF {
1.40 +
1.41 +size_t pageSize();
1.42 +inline bool isPageAligned(void* address) { return !(reinterpret_cast<intptr_t>(address) & (pageSize() - 1)); }
1.43 +inline bool isPageAligned(size_t size) { return !(size & (pageSize() - 1)); }
1.44 +inline bool isPowerOfTwo(size_t size) { return !(size & (size - 1)); }
1.45 +
1.46 +class PageBlock {
1.47 +public:
1.48 + PageBlock();
1.49 + PageBlock(const PageBlock&);
1.50 + PageBlock(void*, size_t);
1.51 +
1.52 + void* base() const { return m_base; }
1.53 + size_t size() const { return m_size; }
1.54 +
1.55 + operator bool() const { return !!m_base; }
1.56 +
1.57 + bool contains(void* containedBase, size_t containedSize)
1.58 + {
1.59 + return containedBase >= m_base
1.60 + && (static_cast<char*>(containedBase) + containedSize) <= (static_cast<char*>(m_base) + m_size);
1.61 + }
1.62 +
1.63 +private:
1.64 + void* m_base;
1.65 + size_t m_size;
1.66 +};
1.67 +
1.68 +inline PageBlock::PageBlock()
1.69 + : m_base(0)
1.70 + , m_size(0)
1.71 +{
1.72 +}
1.73 +
1.74 +inline PageBlock::PageBlock(const PageBlock& other)
1.75 + : m_base(other.m_base)
1.76 + , m_size(other.m_size)
1.77 +{
1.78 +}
1.79 +
1.80 +inline PageBlock::PageBlock(void* base, size_t size)
1.81 + : m_base(base)
1.82 + , m_size(size)
1.83 +{
1.84 +}
1.85 +
1.86 +} // namespace WTF
1.87 +
1.88 +using WTF::pageSize;
1.89 +using WTF::isPageAligned;
1.90 +using WTF::isPageAligned;
1.91 +using WTF::isPowerOfTwo;
1.92 +
1.93 +#endif /* yarr_PageBlock_h */
