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Annotation of gcc/gbl-ctors.h, revision 1.1.1.5

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).
1.1.1.5 ! root        5:    Copyright (C) 1991, 1995 Free Software Foundation, Inc.
        !             6:    Contributed by Ron Guilmette ([email protected])
1.1       root        7: 
                      8: This file is part of GNU CC.
                      9: 
                     10: GNU CC is free software; you can redistribute it and/or modify
                     11: it under the terms of the GNU General Public License as published by
                     12: the Free Software Foundation; either version 2, or (at your option)
                     13: any later version.
                     14: 
                     15: GNU CC is distributed in the hope that it will be useful,
                     16: but WITHOUT ANY WARRANTY; without even the implied warranty of
                     17: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     18: GNU General Public License for more details.
                     19: 
                     20: You should have received a copy of the GNU General Public License
                     21: along with GNU CC; see the file COPYING.  If not, write to
1.1.1.5 ! root       22: the Free Software Foundation, 59 Temple Place - Suite 330,
        !            23: Boston, MA 02111-1307, USA.  */
1.1       root       24: 
                     25: /*     This file contains definitions and declarations of things
                     26:        relating to the normal start-up-time invocation of C++
                     27:        file-scope static object constructors.  These declarations
                     28:        and definitions are used by *both* libgcc2.c and by crtstuff.c.
                     29: 
                     30:        Note that this file should only be compiled with GCC.
                     31: */
                     32: 
                     33: #ifdef HAVE_ATEXIT
1.1.1.5 ! root       34: #ifdef WINNT
        !            35: extern int atexit (void (*) (void));
        !            36: #else
1.1       root       37: extern void atexit (void (*) (void));
1.1.1.5 ! root       38: #endif
1.1       root       39: #define ON_EXIT(FUNC,ARG) atexit ((FUNC))
1.1.1.3   root       40: #else
                     41: #ifdef sun
                     42: extern void on_exit (void*, void*);
                     43: #define ON_EXIT(FUNC,ARG) on_exit ((FUNC), (ARG))
1.1       root       44: #endif
                     45: #endif
                     46: 
                     47: /*  Declare a pointer to void function type.  */
                     48: 
                     49: typedef void (*func_ptr) (void);
                     50: 
                     51: /* Declare the set of symbols use as begin and end markers for the lists
1.1.1.2   root       52:    of global object constructors and global object destructors.  */
1.1       root       53: 
                     54: extern func_ptr __CTOR_LIST__[];
                     55: extern func_ptr __DTOR_LIST__[];
                     56: 
                     57: /* Declare the routine which need to get invoked at program exit time.  */
                     58: 
                     59: extern void __do_global_dtors ();
                     60: 
                     61: /* Define a macro with the code which needs to be executed at program
                     62:    start-up time.  This macro is used in two places in crtstuff.c (for
                     63:    systems which support a .init section) and in one place in libgcc2.c
                     64:    (for those system which do *not* support a .init section).  For all
                     65:    three places where this code might appear, it must be identical, so
                     66:    we define it once here as a macro to avoid various instances getting
                     67:    out-of-sync with one another.  */
                     68: 
1.1.1.4   root       69: /* Some systems place the number of pointers
                     70:    in the first word of the table.
                     71:    On other systems, that word is -1.
1.1       root       72:    In all cases, the table is null-terminated.
1.1.1.4   root       73:    If the length is not recorded, count up to the null.  */
1.1       root       74: 
                     75: /* Some systems use a different strategy for finding the ctors.
                     76:    For example, svr3.  */
                     77: #ifndef DO_GLOBAL_CTORS_BODY
                     78: #define DO_GLOBAL_CTORS_BODY                                           \
                     79: do {                                                                   \
1.1.1.4   root       80:   unsigned long nptrs = (unsigned long) __CTOR_LIST__[0];              \
                     81:   unsigned i;                                                          \
                     82:   if (nptrs == -1)                                                     \
                     83:     for (nptrs = 0; __CTOR_LIST__[nptrs + 1] != 0; nptrs++);           \
                     84:   for (i = nptrs; i >= 1; i--)                                         \
                     85:     __CTOR_LIST__[i] ();                                               \
                     86: } while (0) 
1.1       root       87: #endif
                     88: 

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