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1.1
date	92.06.08.19.47.59;	author mwild;	state Exp;
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1.1
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@/* Definitions relating to the special __do_global_init function used
   for getting g++ file-scope static objects constructed.  This file
   wil get included either by gnulib2.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* gnulib2.c and by crtstuff.c.

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

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

extern func_ptr __CTOR_LIST__[];
extern func_ptr __CTOR_END__[];
extern func_ptr __DTOR_LIST__[];
extern func_ptr __DTOR_END__[];

/* 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 gnulib2.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.  */

/* There are two formats for the table __CTOR_LIST__:
   GNU ld: first word is number of pointers, followed by that many pointers.
   ELF/COFF: first word is -1, followed by pointers up to __CTOR_END__.  */

#define DO_GLOBAL_CTORS_BODY						\
do {									\
  int nptrs = *(int *)__CTOR_LIST__;					\
  ON_EXIT (__do_global_dtors, 0);					\
  if (nptrs != -1)							\
    {									\
      int i;								\
      for (i = 1; i <= nptrs; i++)					\
	__CTOR_LIST__[i] ();						\
    }									\
  else									\
    {									\
      func_ptr *p;							\
      for (p = __CTOR_LIST__ + 1; p < __CTOR_END__; )			\
        (*p++) ();							\
    }									\
} while (0)

@