gbl-ctors.h   [plain text]

/* 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).
   Copyright (C) 1991, 1995, 1996, 1998, 1999, 2000, 2003
   Free Software Foundation, Inc.
   Contributed by Ron Guilmette (

This file is part of GCC.

GCC 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

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING.  If not, write to the Free
Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.  */

/* As a special exception, if you link this library with other files,
   some of which are compiled with GCC, to produce an executable,
   this library does not by itself cause the resulting executable
   to be covered by the GNU General Public License.
   This exception does not however invalidate any other reasons why
   the executable file might be covered by the GNU General Public License.  */

/*	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.

/*  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 needs to get invoked at program start time.  */

extern void __do_global_ctors (void);

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

extern void __do_global_dtors (void);

/* 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.  */

/* Some systems place the number of pointers
   in the first word of the table.
   On other systems, that word is -1.
   In all cases, the table is null-terminated.
   If the length is not recorded, count up to the null.  */

/* Some systems use a different strategy for finding the ctors.
   For example, svr3.  */
#define DO_GLOBAL_CTORS_BODY						\
do {									\
  unsigned long nptrs = (unsigned long) __CTOR_LIST__[0];		\
  unsigned i;								\
  if (nptrs == (unsigned long)-1)				        \
    for (nptrs = 0; __CTOR_LIST__[nptrs + 1] != 0; nptrs++);		\
  for (i = nptrs; i >= 1; i--)						\
    __CTOR_LIST__[i] ();						\
} while (0)