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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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