gbl-ctors.h revision 18334 
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 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 HAVE_ATEXIT
34#ifdef WINNT
35extern int atexit (void (*) (void));
36#else
37extern void atexit (void (*) (void));
38#endif
39#define ON_EXIT(FUNC,ARG) atexit ((FUNC))
40#else
41#ifdef sun
42extern void on_exit (void*, void*);
43#define ON_EXIT(FUNC,ARG) on_exit ((FUNC), (ARG))
44#endif
45#endif
46
47/*  Declare a pointer to void function type.  */
48
49typedef void (*func_ptr) (void);
50
51/* Declare the set of symbols use as begin and end markers for the lists
52   of global object constructors and global object destructors.  */
53
54extern func_ptr __CTOR_LIST__[];
55extern func_ptr __DTOR_LIST__[];
56
57/* Declare the routine which need to get invoked at program exit time.  */
58
59extern void __do_global_dtors ();
60
61/* Define a macro with the code which needs to be executed at program
62   start-up time.  This macro is used in two places in crtstuff.c (for
63   systems which support a .init section) and in one place in libgcc2.c
64   (for those system which do *not* support a .init section).  For all
65   three places where this code might appear, it must be identical, so
66   we define it once here as a macro to avoid various instances getting
67   out-of-sync with one another.  */
68
69/* Some systems place the number of pointers
70   in the first word of the table.
71   On other systems, that word is -1.
72   In all cases, the table is null-terminated.
73   If the length is not recorded, count up to the null.  */
74
75/* Some systems use a different strategy for finding the ctors.
76   For example, svr3.  */
77#ifndef DO_GLOBAL_CTORS_BODY
78#define DO_GLOBAL_CTORS_BODY						\
79do {									\
80  unsigned long nptrs = (unsigned long) __CTOR_LIST__[0];		\
81  unsigned i;								\
82  if (nptrs == -1)							\
83    for (nptrs = 0; __CTOR_LIST__[nptrs + 1] != 0; nptrs++);		\
84  for (i = nptrs; i >= 1; i--)						\
85    __CTOR_LIST__[i] ();						\
86} while (0)
87#endif
88
89