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, 1995, 1996, 1998 Free Software Foundation, Inc. 6 Contributed by Ron Guilmette (rfg@segfault.us.com) 7 8This file is part of GNU CC. 9 10GNU CC is free software; you can redistribute it and/or modify 11it under the terms of the GNU General Public License as published by 12the Free Software Foundation; either version 2, or (at your option) 13any later version. 14 15GNU CC is distributed in the hope that it will be useful, 16but WITHOUT ANY WARRANTY; without even the implied warranty of 17MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18GNU General Public License for more details. 19 20You should have received a copy of the GNU General Public License 21along with GNU CC; see the file COPYING. If not, write to 22the Free Software Foundation, 59 Temple Place - Suite 330, 23Boston, MA 02111-1307, USA. */ 24 25/* This file contains definitions and declarations of things 26 relating to the normal start-up-time invocation of C++ 27 file-scope static object constructors. These declarations 28 and definitions are used by *both* libgcc2.c and by crtstuff.c. 29 30 Note that this file should only be compiled with GCC. 31*/ 32 33#ifdef NEED_ATEXIT 34#ifndef HAVE_ATEXIT 35#define HAVE_ATEXIT 1 /* Take it from libgcc2.c */ 36#endif 37#endif 38 39#ifdef HAVE_ATEXIT 40#if defined (WINNT) || defined (NEED_ATEXIT) 41extern int atexit (void (*) (void)); 42#endif 43#define ON_EXIT(FUNC,ARG) atexit ((FUNC)) 44#else 45#ifdef sun 46extern int on_exit (void *, void *); /* The man page says it returns int. */ 47#define ON_EXIT(FUNC,ARG) on_exit ((FUNC), (ARG)) 48#endif 49#endif 50 51/* Declare a pointer to void function type. */ 52 53typedef void (*func_ptr) (void); 54 55/* Declare the set of symbols use as begin and end markers for the lists 56 of global object constructors and global object destructors. */ 57 58extern func_ptr __CTOR_LIST__[]; 59extern func_ptr __DTOR_LIST__[]; 60 61/* Declare the routine which need to get invoked at program exit time. */ 62 63extern void __do_global_dtors (void); 64 65/* Define a macro with the code which needs to be executed at program 66 start-up time. This macro is used in two places in crtstuff.c (for 67 systems which support a .init section) and in one place in libgcc2.c 68 (for those system which do *not* support a .init section). For all 69 three places where this code might appear, it must be identical, so 70 we define it once here as a macro to avoid various instances getting 71 out-of-sync with one another. */ 72 73/* Some systems place the number of pointers 74 in the first word of the table. 75 On other systems, that word is -1. 76 In all cases, the table is null-terminated. 77 If the length is not recorded, count up to the null. */ 78 79/* Some systems use a different strategy for finding the ctors. 80 For example, svr3. */ 81#ifndef DO_GLOBAL_CTORS_BODY 82#define DO_GLOBAL_CTORS_BODY \ 83do { \ 84 unsigned long nptrs = (unsigned long) __CTOR_LIST__[0]; \ 85 unsigned i; \ 86 if (nptrs == (unsigned long)-1) \ 87 for (nptrs = 0; __CTOR_LIST__[nptrs + 1] != 0; nptrs++); \ 88 for (i = nptrs; i >= 1; i--) \ 89 __CTOR_LIST__[i] (); \ 90} while (0) 91#endif 92 93