1 /* 2 If G_HAS_CONSTRUCTORS is true then the compiler support *both* constructors and 3 destructors, in a usable way, including e.g. on library unload. If not you're on 4 your own. 5 6 Some compilers need #pragma to handle this, which does not work with macros, 7 so the way you need to use this is (for constructors): 8 9 #ifdef G_DEFINE_CONSTRUCTOR_NEEDS_PRAGMA 10 #pragma G_DEFINE_CONSTRUCTOR_PRAGMA_ARGS(my_constructor) 11 #endif 12 G_DEFINE_CONSTRUCTOR(my_constructor) 13 static void my_constructor(void) { 14 ... 15 } 16 17 */ 18 19 #ifndef __GTK_DOC_IGNORE__ 20 21 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7) 22 23 #define G_HAS_CONSTRUCTORS 1 24 25 #define G_DEFINE_CONSTRUCTOR(_func) static void __attribute__((constructor)) _func (void); 26 #define G_DEFINE_DESTRUCTOR(_func) static void __attribute__((destructor)) _func (void); 27 28 #elif defined (_MSC_VER) && (_MSC_VER >= 1500) 29 /* Visual studio 2008 and later has _Pragma */ 30 31 #include <stdlib.h> 32 33 #define G_HAS_CONSTRUCTORS 1 34 35 /* We do some weird things to avoid the constructors being optimized 36 * away on VS2015 if WholeProgramOptimization is enabled. First we 37 * make a reference to the array from the wrapper to make sure its 38 * references. Then we use a pragma to make sure the wrapper function 39 * symbol is always included at the link stage. Also, the symbols 40 * need to be extern (but not dllexport), even though they are not 41 * really used from another object file. 42 */ 43 44 /* We need to account for differences between the mangling of symbols 45 * for x86 and x64/ARM/ARM64 programs, as symbols on x86 are prefixed 46 * with an underscore but symbols on x64/ARM/ARM64 are not. 47 */ 48 #ifdef _M_IX86 49 #define G_MSVC_SYMBOL_PREFIX "_" 50 #else 51 #define G_MSVC_SYMBOL_PREFIX "" 52 #endif 53 54 #define G_DEFINE_CONSTRUCTOR(_func) G_MSVC_CTOR (_func, G_MSVC_SYMBOL_PREFIX) 55 #define G_DEFINE_DESTRUCTOR(_func) G_MSVC_DTOR (_func, G_MSVC_SYMBOL_PREFIX) 56 57 #define G_MSVC_CTOR(_func,_sym_prefix) \ 58 static void _func(void); \ 59 extern int (* _array ## _func)(void); \ 60 int _func ## _wrapper(void) { _func(); g_slist_find (NULL, _array ## _func); return 0; } \ 61 __pragma(comment(linker,"/include:" _sym_prefix # _func "_wrapper")) \ 62 __pragma(section(".CRT$XCU",read)) \ 63 __declspec(allocate(".CRT$XCU")) int (* _array ## _func)(void) = _func ## _wrapper; 64 65 #define G_MSVC_DTOR(_func,_sym_prefix) \ 66 static void _func(void); \ 67 extern int (* _array ## _func)(void); \ 68 int _func ## _constructor(void) { atexit (_func); g_slist_find (NULL, _array ## _func); return 0; } \ 69 __pragma(comment(linker,"/include:" _sym_prefix # _func "_constructor")) \ 70 __pragma(section(".CRT$XCU",read)) \ 71 __declspec(allocate(".CRT$XCU")) int (* _array ## _func)(void) = _func ## _constructor; 72 73 #elif defined (_MSC_VER) 74 75 #define G_HAS_CONSTRUCTORS 1 76 77 /* Pre Visual studio 2008 must use #pragma section */ 78 #define G_DEFINE_CONSTRUCTOR_NEEDS_PRAGMA 1 79 #define G_DEFINE_DESTRUCTOR_NEEDS_PRAGMA 1 80 81 #define G_DEFINE_CONSTRUCTOR_PRAGMA_ARGS(_func) \ 82 section(".CRT$XCU",read) 83 #define G_DEFINE_CONSTRUCTOR(_func) \ 84 static void _func(void); \ 85 static int _func ## _wrapper(void) { _func(); return 0; } \ 86 __declspec(allocate(".CRT$XCU")) static int (*p)(void) = _func ## _wrapper; 87 88 #define G_DEFINE_DESTRUCTOR_PRAGMA_ARGS(_func) \ 89 section(".CRT$XCU",read) 90 #define G_DEFINE_DESTRUCTOR(_func) \ 91 static void _func(void); \ 92 static int _func ## _constructor(void) { atexit (_func); return 0; } \ 93 __declspec(allocate(".CRT$XCU")) static int (* _array ## _func)(void) = _func ## _constructor; 94 95 #elif defined(__SUNPRO_C) 96 97 /* This is not tested, but i believe it should work, based on: 98 * http://opensource.apple.com/source/OpenSSL098/OpenSSL098-35/src/fips/fips_premain.c 99 */ 100 101 #define G_HAS_CONSTRUCTORS 1 102 103 #define G_DEFINE_CONSTRUCTOR_NEEDS_PRAGMA 1 104 #define G_DEFINE_DESTRUCTOR_NEEDS_PRAGMA 1 105 106 #define G_DEFINE_CONSTRUCTOR_PRAGMA_ARGS(_func) \ 107 init(_func) 108 #define G_DEFINE_CONSTRUCTOR(_func) \ 109 static void _func(void); 110 111 #define G_DEFINE_DESTRUCTOR_PRAGMA_ARGS(_func) \ 112 fini(_func) 113 #define G_DEFINE_DESTRUCTOR(_func) \ 114 static void _func(void); 115 116 #else 117 118 /* constructors not supported for this compiler */ 119 120 #endif 121 122 #endif /* __GTK_DOC_IGNORE__ */ 123