The Tor Browser / file comparison
comparison: js/src/yarr/PageBlock.h
js/src/yarr/PageBlock.h
- changeset 0
- 6474c204b198
equal
deleted
inserted
replaced
| -1:000000000000 | 0:7a7411fce1f2 |
|---|---|
| 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 ***** */ | |
| 29 | |
| 30 #ifndef yarr_PageBlock_h | |
| 31 #define yarr_PageBlock_h | |
| 32 | |
| 33 #include <stddef.h> | |
| 34 #include <stdint.h> | |
| 35 | |
| 36 namespace WTF { | |
| 37 | |
| 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)); } | |
| 42 | |
| 43 class PageBlock { | |
| 44 public: | |
| 45 PageBlock(); | |
| 46 PageBlock(const PageBlock&); | |
| 47 PageBlock(void*, size_t); | |
| 48 | |
| 49 void* base() const { return m_base; } | |
| 50 size_t size() const { return m_size; } | |
| 51 | |
| 52 operator bool() const { return !!m_base; } | |
| 53 | |
| 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 } | |
| 59 | |
| 60 private: | |
| 61 void* m_base; | |
| 62 size_t m_size; | |
| 63 }; | |
| 64 | |
| 65 inline PageBlock::PageBlock() | |
| 66 : m_base(0) | |
| 67 , m_size(0) | |
| 68 { | |
| 69 } | |
| 70 | |
| 71 inline PageBlock::PageBlock(const PageBlock& other) | |
| 72 : m_base(other.m_base) | |
| 73 , m_size(other.m_size) | |
| 74 { | |
| 75 } | |
| 76 | |
| 77 inline PageBlock::PageBlock(void* base, size_t size) | |
| 78 : m_base(base) | |
| 79 , m_size(size) | |
| 80 { | |
| 81 } | |
| 82 | |
| 83 } // namespace WTF | |
| 84 | |
| 85 using WTF::pageSize; | |
| 86 using WTF::isPageAligned; | |
| 87 using WTF::isPageAligned; | |
| 88 using WTF::isPowerOfTwo; | |
| 89 | |
| 90 #endif /* yarr_PageBlock_h */ |
