1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
/*
* 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
|
