1 /* 2 * Copyright 2010 Luca Barbieri 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining 5 * a copy of this software and associated documentation files (the 6 * "Software"), to deal in the Software without restriction, including 7 * without limitation the rights to use, copy, modify, merge, publish, 8 * distribute, sublicense, and/or sell copies of the Software, and to 9 * permit persons to whom the Software is furnished to do so, subject to 10 * the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the 13 * next paragraph) shall be included in all copies or substantial 14 * portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 19 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE 20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 23 * 24 **************************************************************************/ 25 26 #ifndef U_INIT_H 27 #define U_INIT_H 28 29 /* Use UTIL_INIT(f) to have f called at program initialization. 30 Note that it is only guaranteed to be called if any symbol in the 31 .c file it is in sis referenced by the program. 32 33 UTIL_INIT functions are called in arbitrary order. 34 */ 35 36 #ifdef __cplusplus 37 /* use a C++ global constructor */ 38 #define UTIL_INIT(f) struct f##__gctor_t {f##__gctor_t() {x();}} f##__gctor; 39 #elif defined(_MSC_VER) 40 /* add a pointer to the section where MSVC stores global constructor pointers */ 41 /* see http://blogs.msdn.com/vcblog/archive/2006/10/20/crt-initialization.aspx and 42 http://stackoverflow.com/questions/1113409/attribute-constructor-equivalent-in-vc */ 43 #pragma section(".CRT$XCU",read) 44 #define UTIL_INIT(f) static void __cdecl f##__init(void) {f();}; __declspec(allocate(".CRT$XCU")) void (__cdecl* f##__xcu)(void) = f##__init; 45 #elif defined(__GNUC__) 46 #define UTIL_INIT(f) static void f##__init(void) __attribute__((constructor)); static void f##__init(void) {f();} 47 #else 48 #error Unsupported compiler: please find out how to implement global initializers in C on it 49 #endif 50 51 #endif 52 53
