mirror of
https://github.com/flutter/flutter.git
synced 2026-02-20 02:29:02 +08:00
40 lines
1.8 KiB
C
40 lines
1.8 KiB
C
/*
|
|
* 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 SKY_ENGINE_WTF_STATICCONSTRUCTORS_H_
|
|
#define SKY_ENGINE_WTF_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 // SKY_ENGINE_WTF_STATICCONSTRUCTORS_H_
|