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Annotation of gcc/gbl-ctors.h, revision 1.1.1.4

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: 
1.1.1.4 ! root        6:    Written by Ron Guilmette ([email protected])
1.1       root        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))
1.1.1.3   root       37: #else
                     38: #ifdef sun
                     39: extern void on_exit (void*, void*);
                     40: #define ON_EXIT(FUNC,ARG) on_exit ((FUNC), (ARG))
1.1       root       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
1.1.1.2   root       49:    of global object constructors and global object destructors.  */
1.1       root       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: 
1.1.1.4 ! root       66: /* Some systems place the number of pointers
        !            67:    in the first word of the table.
        !            68:    On other systems, that word is -1.
1.1       root       69:    In all cases, the table is null-terminated.
1.1.1.4 ! root       70:    If the length is not recorded, count up to the null.  */
1.1       root       71: 
                     72: /* Some systems use a different strategy for finding the ctors.
                     73:    For example, svr3.  */
                     74: #ifndef DO_GLOBAL_CTORS_BODY
                     75: #define DO_GLOBAL_CTORS_BODY                                           \
                     76: do {                                                                   \
1.1.1.4 ! root       77:   unsigned long nptrs = (unsigned long) __CTOR_LIST__[0];              \
        !            78:   unsigned i;                                                          \
        !            79:   if (nptrs == -1)                                                     \
        !            80:     for (nptrs = 0; __CTOR_LIST__[nptrs + 1] != 0; nptrs++);           \
        !            81:   for (i = nptrs; i >= 1; i--)                                         \
        !            82:     __CTOR_LIST__[i] ();                                               \
        !            83: } while (0) 
1.1       root       84: #endif
                     85: 

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