gnu/usr.bin/cc/common/gbl-ctors.h

/* Definitions relating to the special __do_global_init function used
   for getting g++ file-scope static objects constructed.  This file
   will get included either by libgcc2.c (for systems that don't support
   a .init section) or by crtstuff.c (for those that do).

   Written by Ron Guilmette (rfg@ncd.com)

Copyright (C) 1991 Free Software Foundation, Inc.

This file is part of GNU CC.

GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/*      This file contains definitions and declarations of things
        relating to the normal start-up-time invocation of C++
        file-scope static object constructors.  These declarations
        and definitions are used by *both* libgcc2.c and by crtstuff.c.

        Note that this file should only be compiled with GCC.
*/

#ifdef HAVE_ATEXIT
extern void atexit (void (*) (void));
#define ON_EXIT(FUNC,ARG) atexit ((FUNC))
#else
#ifdef sun
extern void on_exit (void*, void*);
#define ON_EXIT(FUNC,ARG) on_exit ((FUNC), (ARG))
#endif
#endif

/*  Declare a pointer to void function type.  */

typedef void (*func_ptr) (void);

/* Declare the set of symbols use as begin and end markers for the lists
   of global object constructors and global object destructors.  */

extern func_ptr __CTOR_LIST__[];
extern func_ptr __DTOR_LIST__[];

/* Declare the routine which need to get invoked at program exit time.  */

extern void __do_global_dtors ();

/* Define a macro with the code which needs to be executed at program
   start-up time.  This macro is used in two places in crtstuff.c (for
   systems which support a .init section) and in one place in libgcc2.c
   (for those system which do *not* support a .init section).  For all
   three places where this code might appear, it must be identical, so
   we define it once here as a macro to avoid various instances getting
   out-of-sync with one another.  */

/* The first word may or may not contain the number of pointers in the table.
   In all cases, the table is null-terminated.
   We ignore the first word and scan up to the null.  */

/* Some systems use a different strategy for finding the ctors.
   For example, svr3.  */
#ifndef DO_GLOBAL_CTORS_BODY
#define DO_GLOBAL_CTORS_BODY                                            \
do {                                                                    \
  func_ptr *p;                                                          \
  for (p = __CTOR_LIST__ + 1; *p; )                                     \
    (*p++) ();                                                          \
} while (0)
#endif