1 /* Definitions relating to the special __do_global_init function used 2 for getting g++ file-scope static objects constructed. This file 3 will get included either by libgcc2.c (for systems that don't support 4 a .init section) or by crtstuff.c (for those that do). 5 Copyright (C) 1991-2018 Free Software Foundation, Inc. 6 Contributed by Ron Guilmette (rfg@segfault.us.com) 7 8 This file is part of GCC. 9 10 GCC is free software; you can redistribute it and/or modify it under 11 the terms of the GNU General Public License as published by the Free 12 Software Foundation; either version 3, or (at your option) any later 13 version. 14 15 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 16 WARRANTY; without even the implied warranty of MERCHANTABILITY or 17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 18 for more details. 19 20 Under Section 7 of GPL version 3, you are granted additional 21 permissions described in the GCC Runtime Library Exception, version 22 3.1, as published by the Free Software Foundation. 23 24 You should have received a copy of the GNU General Public License and 25 a copy of the GCC Runtime Library Exception along with this program; 26 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 27 <http://www.gnu.org/licenses/>. */ 28 29 /* This file contains definitions and declarations of things 30 relating to the normal start-up-time invocation of C++ 31 file-scope static object constructors. These declarations 32 and definitions are used by *both* libgcc2.c and by crtstuff.c. 33 34 Note that this file should only be compiled with GCC. 35 */ 36 37 #ifndef GCC_GBL_CTORS_H 38 #define GCC_GBL_CTORS_H 39 40 /* Declare a pointer to void function type. */ 41 42 typedef void (*func_ptr) (void); 43 44 /* Declare the set of symbols use as begin and end markers for the lists 45 of global object constructors and global object destructors. */ 46 47 extern func_ptr __CTOR_LIST__[]; 48 extern func_ptr __DTOR_LIST__[]; 49 50 /* Declare the routine which needs to get invoked at program start time. */ 51 52 extern void __do_global_ctors (void); 53 54 /* Declare the routine which needs to get invoked at program exit time. */ 55 56 extern void __do_global_dtors (void); 57 58 /* Define a macro with the code which needs to be executed at program 59 start-up time. This macro is used in two places in crtstuff.c (for 60 systems which support a .init section) and in one place in libgcc2.c 61 (for those system which do *not* support a .init section). For all 62 three places where this code might appear, it must be identical, so 63 we define it once here as a macro to avoid various instances getting 64 out-of-sync with one another. */ 65 66 /* Some systems place the number of pointers 67 in the first word of the table. 68 On other systems, that word is -1. 69 In all cases, the table is null-terminated. 70 If the length is not recorded, count up to the null. */ 71 72 /* Some systems use a different strategy for finding the ctors. 73 For example, svr3. */ 74 #ifndef DO_GLOBAL_CTORS_BODY 75 #define DO_GLOBAL_CTORS_BODY \ 76 do { \ 77 __SIZE_TYPE__ nptrs = (__SIZE_TYPE__) __CTOR_LIST__[0]; \ 78 unsigned i; \ 79 if (nptrs == (__SIZE_TYPE__)-1) \ 80 for (nptrs = 0; __CTOR_LIST__[nptrs + 1] != 0; nptrs++); \ 81 for (i = nptrs; i >= 1; i--) \ 82 __CTOR_LIST__[i] (); \ 83 } while (0) 84 #endif 85 86 #endif /* GCC_GBL_CTORS_H */ 87