| /* |
| * Copyright (C) 2006 Apple Computer, Inc. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #ifndef StaticConstructors_h |
| #define StaticConstructors_h |
| |
| // We need to avoid having static constructors. This is accomplished by defining |
| // a static array of the appropriate size and alignment, and defining a const |
| // reference that points to the buffer. During initialization, the object will |
| // be constructed with placement new into the buffer. This works with MSVC, GCC, |
| // and Clang without producing dynamic initialization code even at -O0. The only |
| // downside is that all external translation units will have to emit one more |
| // load, while a real global could be referenced directly by absolute or |
| // relative addressing. |
| |
| // Use an array of pointers instead of an array of char in case there is some |
| // alignment issue. |
| #define DEFINE_GLOBAL(type, name) \ |
| void* name##Storage[(sizeof(type) + sizeof(void*) - 1) / sizeof(void*)]; \ |
| const type& name = *reinterpret_cast<type*>(&name##Storage) |
| |
| #endif // StaticConstructors_h |
