The Tor Browser: js/src/yarr/PageBlock.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-

     2  * vim: set ts=8 sts=4 et sw=4 tw=99:

     3  *

     4  * ***** BEGIN LICENSE BLOCK *****

     5  * Copyright (C) 2010 Apple Inc. All rights reserved.

     6  *

     7  * Redistribution and use in source and binary forms, with or without

     8  * modification, are permitted provided that the following conditions

     9  * are met:

    10  * 1. Redistributions of source code must retain the above copyright

    11  *    notice, this list of conditions and the following disclaimer.

    12  * 2. Redistributions in binary form must reproduce the above copyright

    13  *    notice, this list of conditions and the following disclaimer in the

    14  *    documentation and/or other materials provided with the distribution.

    15  *

    16  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''

    17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

    18  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    19  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS

    20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

    21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

    22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

    23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

    24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF

    26  * THE POSSIBILITY OF SUCH DAMAGE.

    27  *

    28  * ***** END LICENSE BLOCK ***** */

    30 #ifndef yarr_PageBlock_h

    31 #define yarr_PageBlock_h

    33 #include <stddef.h>

    34 #include <stdint.h>

    36 namespace WTF {

    38 size_t pageSize();

    39 inline bool isPageAligned(void* address) { return !(reinterpret_cast<intptr_t>(address) & (pageSize() - 1)); }

    40 inline bool isPageAligned(size_t size) { return !(size & (pageSize() - 1)); }

    41 inline bool isPowerOfTwo(size_t size) { return !(size & (size - 1)); }

    43 class PageBlock {

    44 public:

    45     PageBlock();

    46     PageBlock(const PageBlock&);

    47     PageBlock(void*, size_t);

    49     void* base() const { return m_base; }

    50     size_t size() const { return m_size; }

    52     operator bool() const { return !!m_base; }

    54     bool contains(void* containedBase, size_t containedSize)

    55     {

    56         return containedBase >= m_base

    57             && (static_cast<char*>(containedBase) + containedSize) <= (static_cast<char*>(m_base) + m_size);

    58     }

    60 private:

    61     void* m_base;

    62     size_t m_size;

    63 };

    65 inline PageBlock::PageBlock()

    66     : m_base(0)

    67     , m_size(0)

    68 {

    69 }

    71 inline PageBlock::PageBlock(const PageBlock& other)

    72     : m_base(other.m_base)

    73     , m_size(other.m_size)

    74 {

    75 }

    77 inline PageBlock::PageBlock(void* base, size_t size)

    78     : m_base(base)

    79     , m_size(size)

    80 {

    81 }

    83 } // namespace WTF

    85 using WTF::pageSize;

    86 using WTF::isPageAligned;

    87 using WTF::isPageAligned;

    88 using WTF::isPowerOfTwo;

    90 #endif /* yarr_PageBlock_h */

The Tor Browser / file revision