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) 1991-2015 Free Software Foundation, Inc. 6 Contributed by Ron Guilmette (rfg@segfault.us.com) 7 8This file is part of GCC. 9 10GCC is free software; you can redistribute it and/or modify it under 11the terms of the GNU General Public License as published by the Free 12Software Foundation; either version 3, or (at your option) any later 13version. 14 15GCC is distributed in the hope that it will be useful, but WITHOUT ANY 16WARRANTY; without even the implied warranty of MERCHANTABILITY or 17FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 18for more details. 19 20Under Section 7 of GPL version 3, you are granted additional 21permissions described in the GCC Runtime Library Exception, version 223.1, as published by the Free Software Foundation. 23 24You should have received a copy of the GNU General Public License and 25a copy of the GCC Runtime Library Exception along with this program; 26see 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 42typedef 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 47extern func_ptr __CTOR_LIST__[]; 48extern func_ptr __DTOR_LIST__[]; 49 50/* Declare the routine which needs to get invoked at program start time. */ 51 52extern void __do_global_ctors (void); 53 54/* Declare the routine which needs to get invoked at program exit time. */ 55 56extern 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 \ 76do { \ 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