| /* |
| * Copyright (C) 2006 Apple 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. We achieve this |
| // with two separate methods for GCC and MSVC. Both methods prevent the static |
| // initializers from being registered and called on program startup. On GCC, we |
| // declare the global objects with a different type that can be POD default |
| // initialized by the linker/loader. On MSVC we use a special compiler feature |
| // to have the CRT ignore our static initializers. The constructors will never |
| // be called and the objects will be left uninitialized. |
| // |
| // With both of these approaches, we must define and explicitly call an init |
| // routine that uses placement new to create the objects and overwrite the |
| // uninitialized placeholders. |
| // |
| // This is not completely portable, but is what we have for now without |
| // changing how a lot of code accesses these global objects. |
| |
| #ifdef SKIP_STATIC_CONSTRUCTORS_ON_MSVC |
| // - Assume that all includes of this header want ALL of their static |
| // initializers ignored. This is currently the case. This means that if |
| // a .cc includes this header (or it somehow gets included), all static |
| // initializers after the include will not be executed. |
| // - We do this with a pragma, so that all of the static initializer pointers |
| // go into our own section, and the CRT won't call them. Eventually it would |
| // be nice if the section was discarded, because we don't want the pointers. |
| // See: http://msdn.microsoft.com/en-us/library/7977wcck(VS.80).aspx |
| #pragma warning(disable:4075) |
| #pragma init_seg(".unwantedstaticinits") |
| #endif |
| |
| #ifndef SKIP_STATIC_CONSTRUCTORS_ON_GCC |
| // Define an global in the normal way. |
| #define DEFINE_GLOBAL(type, name, ...) \ |
| const type name; |
| |
| #else |
| // Define an correctly-sized array of pointers to avoid static initialization. |
| // 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[(sizeof(type) + sizeof(void *) - 1) / sizeof(void *)]; |
| #endif |
| |
| #endif // StaticConstructors_h |
