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1 /* | |
2 * Copyright (C) 2010 Apple 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 * 1. Redistributions of source code must retain the above copyright | |
8 * notice, this list of conditions and the following disclaimer. | |
9 * 2. Redistributions in binary form must reproduce the above copyright | |
10 * notice, this list of conditions and the following disclaimer in the | |
11 * documentation and/or other materials provided with the distribution. | |
12 * | |
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' | |
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS | |
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF | |
23 * THE POSSIBILITY OF SUCH DAMAGE. | |
24 */ | |
25 | |
26 #ifndef PageBlock_h | |
27 #define PageBlock_h | |
28 | |
29 namespace WTF { | |
30 | |
31 WTF_EXPORT_PRIVATE size_t pageSize(); | |
32 WTF_EXPORT_PRIVATE size_t pageMask(); | |
33 inline bool isPageAligned(void* address) { return !(reinterpret_cast<intptr_t>(a
ddress) & (pageSize() - 1)); } | |
34 inline bool isPageAligned(size_t size) { return !(size & (pageSize() - 1)); } | |
35 inline bool isPowerOfTwo(size_t size) { return !(size & (size - 1)); } | |
36 | |
37 class PageBlock { | |
38 public: | |
39 PageBlock(); | |
40 PageBlock(const PageBlock&); | |
41 PageBlock(void*, size_t, bool hasGuardPages); | |
42 | |
43 void* base() const { return m_base; } | |
44 size_t size() const { return m_size; } | |
45 | |
46 operator bool() const { return !!m_realBase; } | |
47 | |
48 bool contains(void* containedBase, size_t containedSize) | |
49 { | |
50 return containedBase >= m_base | |
51 && (static_cast<char*>(containedBase) + containedSize) <= (static_ca
st<char*>(m_base) + m_size); | |
52 } | |
53 | |
54 private: | |
55 void* m_realBase; | |
56 void* m_base; | |
57 size_t m_size; | |
58 }; | |
59 | |
60 inline PageBlock::PageBlock() | |
61 : m_realBase(0) | |
62 , m_base(0) | |
63 , m_size(0) | |
64 { | |
65 } | |
66 | |
67 inline PageBlock::PageBlock(const PageBlock& other) | |
68 : m_realBase(other.m_realBase) | |
69 , m_base(other.m_base) | |
70 , m_size(other.m_size) | |
71 { | |
72 } | |
73 | |
74 inline PageBlock::PageBlock(void* base, size_t size, bool hasGuardPages) | |
75 : m_realBase(base) | |
76 , m_base(static_cast<char*>(base) + ((base && hasGuardPages) ? pageSize() :
0)) | |
77 , m_size(size) | |
78 { | |
79 } | |
80 | |
81 } // namespace WTF | |
82 | |
83 using WTF::pageSize; | |
84 using WTF::isPageAligned; | |
85 using WTF::isPageAligned; | |
86 using WTF::isPowerOfTwo; | |
87 | |
88 #endif // PageBlock_h | |
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