js/src/yarr/PageBlock.h@6474c204b198 (annotated)
js/src/yarr/PageBlock.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| michael@0 | 2 | * vim: set ts=8 sts=4 et sw=4 tw=99: |
| michael@0 | 3 | * |
| michael@0 | 4 | * ***** BEGIN LICENSE BLOCK ***** |
| michael@0 | 5 | * Copyright (C) 2010 Apple Inc. All rights reserved. |
| michael@0 | 6 | * |
| michael@0 | 7 | * Redistribution and use in source and binary forms, with or without |
| michael@0 | 8 | * modification, are permitted provided that the following conditions |
| michael@0 | 9 | * are met: |
| michael@0 | 10 | * 1. Redistributions of source code must retain the above copyright |
| michael@0 | 11 | * notice, this list of conditions and the following disclaimer. |
| michael@0 | 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| michael@0 | 13 | * notice, this list of conditions and the following disclaimer in the |
| michael@0 | 14 | * documentation and/or other materials provided with the distribution. |
| michael@0 | 15 | * |
| michael@0 | 16 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| michael@0 | 17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| michael@0 | 18 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| michael@0 | 19 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| michael@0 | 20 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| michael@0 | 21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| michael@0 | 22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| michael@0 | 23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| michael@0 | 24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| michael@0 | 25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| michael@0 | 26 | * THE POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 27 | * |
| michael@0 | 28 | * ***** END LICENSE BLOCK ***** */ |
| michael@0 | 29 | |
| michael@0 | 30 | #ifndef yarr_PageBlock_h |
| michael@0 | 31 | #define yarr_PageBlock_h |
| michael@0 | 32 | |
| michael@0 | 33 | #include <stddef.h> |
| michael@0 | 34 | #include <stdint.h> |
| michael@0 | 35 | |
| michael@0 | 36 | namespace WTF { |
| michael@0 | 37 | |
| michael@0 | 38 | size_t pageSize(); |
| michael@0 | 39 | inline bool isPageAligned(void* address) { return !(reinterpret_cast<intptr_t>(address) & (pageSize() - 1)); } |
| michael@0 | 40 | inline bool isPageAligned(size_t size) { return !(size & (pageSize() - 1)); } |
| michael@0 | 41 | inline bool isPowerOfTwo(size_t size) { return !(size & (size - 1)); } |
| michael@0 | 42 | |
| michael@0 | 43 | class PageBlock { |
| michael@0 | 44 | public: |
| michael@0 | 45 | PageBlock(); |
| michael@0 | 46 | PageBlock(const PageBlock&); |
| michael@0 | 47 | PageBlock(void*, size_t); |
| michael@0 | 48 | |
| michael@0 | 49 | void* base() const { return m_base; } |
| michael@0 | 50 | size_t size() const { return m_size; } |
| michael@0 | 51 | |
| michael@0 | 52 | operator bool() const { return !!m_base; } |
| michael@0 | 53 | |
| michael@0 | 54 | bool contains(void* containedBase, size_t containedSize) |
| michael@0 | 55 | { |
| michael@0 | 56 | return containedBase >= m_base |
| michael@0 | 57 | && (static_cast<char*>(containedBase) + containedSize) <= (static_cast<char*>(m_base) + m_size); |
| michael@0 | 58 | } |
| michael@0 | 59 | |
| michael@0 | 60 | private: |
| michael@0 | 61 | void* m_base; |
| michael@0 | 62 | size_t m_size; |
| michael@0 | 63 | }; |
| michael@0 | 64 | |
| michael@0 | 65 | inline PageBlock::PageBlock() |
| michael@0 | 66 | : m_base(0) |
| michael@0 | 67 | , m_size(0) |
| michael@0 | 68 | { |
| michael@0 | 69 | } |
| michael@0 | 70 | |
| michael@0 | 71 | inline PageBlock::PageBlock(const PageBlock& other) |
| michael@0 | 72 | : m_base(other.m_base) |
| michael@0 | 73 | , m_size(other.m_size) |
| michael@0 | 74 | { |
| michael@0 | 75 | } |
| michael@0 | 76 | |
| michael@0 | 77 | inline PageBlock::PageBlock(void* base, size_t size) |
| michael@0 | 78 | : m_base(base) |
| michael@0 | 79 | , m_size(size) |
| michael@0 | 80 | { |
| michael@0 | 81 | } |
| michael@0 | 82 | |
| michael@0 | 83 | } // namespace WTF |
| michael@0 | 84 | |
| michael@0 | 85 | using WTF::pageSize; |
| michael@0 | 86 | using WTF::isPageAligned; |
| michael@0 | 87 | using WTF::isPageAligned; |
| michael@0 | 88 | using WTF::isPowerOfTwo; |
| michael@0 | 89 | |
| michael@0 | 90 | #endif /* yarr_PageBlock_h */ |
