gcc/gbl-ctors.h

   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    Copyright (C) 1991, 1995, 1996, 1998, 1999, 2000, 2003
   6    Free Software Foundation, Inc.
   7    Contributed by Ron Guilmette (rfg@segfault.us.com)
   8
   9 This file is part of GCC.
  10
  11 GCC is free software; you can redistribute it and/or modify it under
  12 the terms of the GNU General Public License as published by the Free
  13 Software Foundation; either version 2, or (at your option) any later
  14 version.
  15
  16 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  17 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19 for more details.
  20
  21 You should have received a copy of the GNU General Public License
  22 along with GCC; see the file COPYING.  If not, write to the Free
  23 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  24 02110-1301, USA.  */
  25
  26 /* As a special exception, if you link this library with other files,
  27    some of which are compiled with GCC, to produce an executable,
  28    this library does not by itself cause the resulting executable
  29    to be covered by the GNU General Public License.
  30    This exception does not however invalidate any other reasons why
  31    the executable file might be covered by the GNU General Public License.  */
  32
  33 /*      This file contains definitions and declarations of things
  34         relating to the normal start-up-time invocation of C++
  35         file-scope static object constructors.  These declarations
  36         and definitions are used by *both* libgcc2.c and by crtstuff.c.
  37
  38         Note that this file should only be compiled with GCC.
  39 */
  40
  41 /*  Declare a pointer to void function type.  */
  42
  43 typedef void (*func_ptr) (void);
  44
  45 /* Declare the set of symbols use as begin and end markers for the lists
  46    of global object constructors and global object destructors.  */
  47
  48 extern func_ptr __CTOR_LIST__[];
  49 extern func_ptr __DTOR_LIST__[];
  50
  51 /* Declare the routine which needs to get invoked at program start time.  */
  52
  53 extern void __do_global_ctors (void);
  54
  55 /* Declare the routine which needs to get invoked at program exit time.  */
  56
  57 extern void __do_global_dtors (void);
  58
  59 /* Define a macro with the code which needs to be executed at program
  60    start-up time.  This macro is used in two places in crtstuff.c (for
  61    systems which support a .init section) and in one place in libgcc2.c
  62    (for those system which do *not* support a .init section).  For all
  63    three places where this code might appear, it must be identical, so
  64    we define it once here as a macro to avoid various instances getting
  65    out-of-sync with one another.  */
  66
  67 /* Some systems place the number of pointers
  68    in the first word of the table.
  69    On other systems, that word is -1.
  70    In all cases, the table is null-terminated.
  71    If the length is not recorded, count up to the null.  */
  72
  73 /* Some systems use a different strategy for finding the ctors.
  74    For example, svr3.  */
  75 #ifndef DO_GLOBAL_CTORS_BODY
  76 #define DO_GLOBAL_CTORS_BODY                                            \
  77 do {                                                                    \
  78   unsigned long nptrs = (unsigned long) __CTOR_LIST__[0];               \
  79   unsigned i;                                                           \
  80   if (nptrs == (unsigned long)-1)                                       \
  81     for (nptrs = 0; __CTOR_LIST__[nptrs + 1] != 0; nptrs++);            \
  82   for (i = nptrs; i >= 1; i--)                                          \
  83     __CTOR_LIST__[i] ();                                                \
  84 } while (0)
  85 #endif
  86