gbl-ctors.h revision 90075 
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, 1999, 2000
6   Free Software Foundation, Inc.
7   Contributed by Ron Guilmette (rfg@segfault.us.com)
8
9This file is part of GCC.
10
11GCC is free software; you can redistribute it and/or modify it under
12the terms of the GNU General Public License as published by the Free
13Software Foundation; either version 2, or (at your option) any later
14version.
15
16GCC is distributed in the hope that it will be useful, but WITHOUT ANY
17WARRANTY; without even the implied warranty of MERCHANTABILITY or
18FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
19for more details.
20
21You should have received a copy of the GNU General Public License
22along with GCC; see the file COPYING.  If not, write to the Free
23Software Foundation, 59 Temple Place - Suite 330, Boston, MA
2402111-1307, USA.  */
25
26/*	This file contains definitions and declarations of things
27	relating to the normal start-up-time invocation of C++
28	file-scope static object constructors.  These declarations
29	and definitions are used by *both* libgcc2.c and by crtstuff.c.
30
31	Note that this file should only be compiled with GCC.
32*/
33
34#ifdef NEED_ATEXIT
35extern int atexit (void (*) (void));
36#endif
37
38/*  Declare a pointer to void function type.  */
39
40typedef void (*func_ptr) (void);
41
42/* Declare the set of symbols use as begin and end markers for the lists
43   of global object constructors and global object destructors.  */
44
45extern func_ptr __CTOR_LIST__[];
46extern func_ptr __DTOR_LIST__[];
47
48/* Declare the routine which needs to get invoked at program start time.  */
49
50extern void __do_global_ctors (void);
51
52/* Declare the routine which needs to get invoked at program exit time.  */
53
54extern void __do_global_dtors (void);
55
56/* Define a macro with the code which needs to be executed at program
57   start-up time.  This macro is used in two places in crtstuff.c (for
58   systems which support a .init section) and in one place in libgcc2.c
59   (for those system which do *not* support a .init section).  For all
60   three places where this code might appear, it must be identical, so
61   we define it once here as a macro to avoid various instances getting
62   out-of-sync with one another.  */
63
64/* Some systems place the number of pointers
65   in the first word of the table.
66   On other systems, that word is -1.
67   In all cases, the table is null-terminated.
68   If the length is not recorded, count up to the null.  */
69
70/* Some systems use a different strategy for finding the ctors.
71   For example, svr3.  */
72#ifndef DO_GLOBAL_CTORS_BODY
73#define DO_GLOBAL_CTORS_BODY						\
74do {									\
75  unsigned long nptrs = (unsigned long) __CTOR_LIST__[0];		\
76  unsigned i;								\
77  if (nptrs == (unsigned long)-1)				        \
78    for (nptrs = 0; __CTOR_LIST__[nptrs + 1] != 0; nptrs++);		\
79  for (i = nptrs; i >= 1; i--)						\
80    __CTOR_LIST__[i] ();						\
81} while (0)
82#endif
83
84