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Annotation of GNUtools/cc/gbl-ctors.h, revision 1.1.1.1

1.1       root        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: 
                      6:    Written by Ron Guilmette ([email protected])
                      7: 
                      8: Copyright (C) 1991 Free Software Foundation, Inc.
                      9: 
                     10: This file is part of GNU CC.
                     11: 
                     12: GNU CC is free software; you can redistribute it and/or modify
                     13: it under the terms of the GNU General Public License as published by
                     14: the Free Software Foundation; either version 2, or (at your option)
                     15: any later version.
                     16: 
                     17: GNU CC is distributed in the hope that it will be useful,
                     18: but WITHOUT ANY WARRANTY; without even the implied warranty of
                     19: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     20: GNU General Public License for more details.
                     21: 
                     22: You should have received a copy of the GNU General Public License
                     23: along with GNU CC; see the file COPYING.  If not, write to
                     24: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, 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 HAVE_ATEXIT
                     35: extern void atexit (void (*) (void));
                     36: #define ON_EXIT(FUNC,ARG) atexit ((FUNC))
                     37: #else
                     38: #ifdef sun
                     39: extern void on_exit (void*, void*);
                     40: #define ON_EXIT(FUNC,ARG) on_exit ((FUNC), (ARG))
                     41: #endif
                     42: #endif
                     43: 
                     44: /*  Declare a pointer to void function type.  */
                     45: 
                     46: typedef void (*func_ptr) (void);
                     47: 
                     48: /* Declare the set of symbols use as begin and end markers for the lists
                     49:    of global object constructors and global object destructors.  */
                     50: 
                     51: extern func_ptr __CTOR_LIST__[];
                     52: extern func_ptr __DTOR_LIST__[];
                     53: 
                     54: /* Declare the routine which need to get invoked at program exit time.  */
                     55: 
                     56: extern void __do_global_dtors ();
                     57: 
                     58: /* Define a macro with the code which needs to be executed at program
                     59:    start-up time.  This macro is used in two places in crtstuff.c (for
                     60:    systems which support a .init section) and in one place in libgcc2.c
                     61:    (for those system which do *not* support a .init section).  For all
                     62:    three places where this code might appear, it must be identical, so
                     63:    we define it once here as a macro to avoid various instances getting
                     64:    out-of-sync with one another.  */
                     65: 
                     66: /* The first word may or may not contain the number of pointers in the table.
                     67:    In all cases, the table is null-terminated.
                     68:    We ignore the first word and scan 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                                           \
                     74: do {                                                                   \
                     75:   func_ptr *p;                                                         \
                     76:   for (p = __CTOR_LIST__ + 1; *p; )                                    \
                     77:     (*p++) ();                                                         \
                     78: } while (0)
                     79: #endif
                     80: 

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