Borrow G_DEFINE_CONSTRUCTOR from GLib

This commit is contained in:
Gergely Polonkai 2016-02-02 17:47:49 +01:00
parent 1e7c54dd45
commit a3623c55f4

144
src/matrix-event-types.c Normal file
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/*
* This file is part of matrix-glib-sdk
*
* matrix-glib-sdk is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, either
* version 3 of the License, or (at your option) any later version.
*
* matrix-glib-sdk 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with matrix-glib-sdk. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include "matrix-glib.h"
#include "matrix-marshalers.h"
/*
Borrowed from GLib
If G_HAS_CONSTRUCTORS is true then the compiler support *both*
constructors and destructors, in a sane way, including e.g. on
library unload. If not you're on your own.
Some compilers need #pragma to handle this, which does not work with macros,
so the way you need to use this is (for constructors):
#ifdef G_DEFINE_CONSTRUCTOR_NEEDS_PRAGMA
#pragma G_DEFINE_CONSTRUCTOR_PRAGMA_ARGS(my_constructor)
#endif
G_DEFINE_CONSTRUCTOR(my_constructor)
static void my_constructor(void) {
...
}
*/
#ifndef __GTK_DOC_IGNORE__
#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
#define G_HAS_CONSTRUCTORS 1
#define G_DEFINE_CONSTRUCTOR(_func) static void __attribute__((constructor)) _func (void);
#define G_DEFINE_DESTRUCTOR(_func) static void __attribute__((destructor)) _func (void);
#elif defined (_MSC_VER) && (_MSC_VER >= 1500)
/* Visual studio 2008 and later has _Pragma */
#define G_HAS_CONSTRUCTORS 1
/* We do some weird things to avoid the constructors being optimized
* away on VS2015 if WholeProgramOptimization is enabled. First we
* make a reference to the array from the wrapper to make sure its
* references. Then we use a pragma to make sure the wrapper function
* symbol is always included at the link stage. Also, the symbols
* need to be extern (but not dllexport), even though they are not
* really used from another object file.
*/
/* We need to account for differences between the mangling of symbols
* for Win32 (x86) and x64 programs, as symbols on Win32 are prefixed
* with an underscore but symbols on x64 are not.
*/
#ifdef _WIN64
#define G_MSVC_SYMBOL_PREFIX ""
#else
#define G_MSVC_SYMBOL_PREFIX "_"
#endif
#define G_DEFINE_CONSTRUCTOR(_func) G_MSVC_CTOR (_func, G_MSVC_SYMBOL_PREFIX)
#define G_DEFINE_DESTRUCTOR(_func) G_MSVC_DTOR (_func, G_MSVC_SYMBOL_PREFIX)
#define G_MSVC_CTOR(_func,_sym_prefix) \
static void _func(void); \
extern int (* _array ## _func)(void); \
int _func ## _wrapper(void) { _func(); g_slist_find (NULL, _array ## _func); return 0; } \
__pragma(comment(linker,"/include:" _sym_prefix # _func "_wrapper")) \
__pragma(section(".CRT$XCU",read)) \
__declspec(allocate(".CRT$XCU")) int (* _array ## _func)(void) = _func ## _wrapper;
#define G_MSVC_DTOR(_func,_sym_prefix) \
static void _func(void); \
extern int (* _array ## _func)(void); \
int _func ## _constructor(void) { atexit (_func); g_slist_find (NULL, _array ## _func); return 0; } \
__pragma(comment(linker,"/include:" _sym_prefix # _func "_constructor")) \
__pragma(section(".CRT$XCU",read)) \
__declspec(allocate(".CRT$XCU")) int (* _array ## _func)(void) = _func ## _constructor;
#elif defined (_MSC_VER)
#define G_HAS_CONSTRUCTORS 1
/* Pre Visual studio 2008 must use #pragma section */
#define G_DEFINE_CONSTRUCTOR_NEEDS_PRAGMA 1
#define G_DEFINE_DESTRUCTOR_NEEDS_PRAGMA 1
#define G_DEFINE_CONSTRUCTOR_PRAGMA_ARGS(_func) \
section(".CRT$XCU",read)
#define G_DEFINE_CONSTRUCTOR(_func) \
static void _func(void); \
static int _func ## _wrapper(void) { _func(); return 0; } \
__declspec(allocate(".CRT$XCU")) static int (*p)(void) = _func ## _wrapper;
#define G_DEFINE_DESTRUCTOR_PRAGMA_ARGS(_func) \
section(".CRT$XCU",read)
#define G_DEFINE_DESTRUCTOR(_func) \
static void _func(void); \
static int _func ## _constructor(void) { atexit (_func); return 0; } \
__declspec(allocate(".CRT$XCU")) static int (* _array ## _func)(void) = _func ## _constructor;
#elif defined(__SUNPRO_C)
/* This is not tested, but i believe it should work, based on:
* http://opensource.apple.com/source/OpenSSL098/OpenSSL098-35/src/fips/fips_premain.c
*/
#define G_HAS_CONSTRUCTORS 1
#define G_DEFINE_CONSTRUCTOR_NEEDS_PRAGMA 1
#define G_DEFINE_DESTRUCTOR_NEEDS_PRAGMA 1
#define G_DEFINE_CONSTRUCTOR_PRAGMA_ARGS(_func) \
init(_func)
#define G_DEFINE_CONSTRUCTOR(_func) \
static void _func(void);
#define G_DEFINE_DESTRUCTOR_PRAGMA_ARGS(_func) \
fini(_func)
#define G_DEFINE_DESTRUCTOR(_func) \
static void _func(void);
#else
/* constructors not supported for this compiler */
#errer "Constructors are not supported by your compiler, but are needed for this library"
#endif
#endif /* __GTK_DOC_IGNORE__ */