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Side by Side Diff: third_party/WebKit/Source/wtf/StaticConstructors.h

Issue 2386843002: reflow comments in wtf (Closed)
Patch Set: comments (heh!) Created 4 years, 2 months ago
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1 /* 1 /*
2 * Copyright (C) 2006 Apple Computer, Inc. 2 * Copyright (C) 2006 Apple Computer, Inc.
3 * 3 *
4 * This library is free software; you can redistribute it and/or 4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public 5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either 6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version. 7 * version 2 of the License, or (at your option) any later version.
8 * 8 *
9 * This library is distributed in the hope that it will be useful, 9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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23 23
24 // We need to avoid having static constructors. This is accomplished by defining 24 // We need to avoid having static constructors. This is accomplished by defining
25 // a static array of the appropriate size and alignment, and defining a const 25 // a static array of the appropriate size and alignment, and defining a const
26 // reference that points to the buffer. During initialization, the object will 26 // reference that points to the buffer. During initialization, the object will
27 // be constructed with placement new into the buffer. This works with MSVC, GCC, 27 // be constructed with placement new into the buffer. This works with MSVC, GCC,
28 // and Clang without producing dynamic initialization code even at -O0. The only 28 // and Clang without producing dynamic initialization code even at -O0. The only
29 // downside is that all external translation units will have to emit one more 29 // downside is that all external translation units will have to emit one more
30 // load, while a real global could be referenced directly by absolute or 30 // load, while a real global could be referenced directly by absolute or
31 // relative addressing. 31 // relative addressing.
32 32
33 // Use an array of pointers instead of an array of char in case there is some al ignment issue. 33 // Use an array of pointers instead of an array of char in case there is some
34 // alignment issue.
34 #define DEFINE_GLOBAL(type, name, ...) \ 35 #define DEFINE_GLOBAL(type, name, ...) \
35 void* name##Storage[(sizeof(type) + sizeof(void*) - 1) / sizeof(void*)]; \ 36 void* name##Storage[(sizeof(type) + sizeof(void*) - 1) / sizeof(void*)]; \
36 const type& name = *reinterpret_cast<type*>(&name##Storage); 37 const type& name = *reinterpret_cast<type*>(&name##Storage);
37 38
38 #endif // StaticConstructors_h 39 #endif // StaticConstructors_h
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