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) 1991-2023 Free Software Foundation, Inc.
       6     Contributed by Ron Guilmette (rfg@segfault.us.com)
       7  
       8  This file is part of GCC.
       9  
      10  GCC is free software; you can redistribute it and/or modify it under
      11  the terms of the GNU General Public License as published by the Free
      12  Software Foundation; either version 3, or (at your option) any later
      13  version.
      14  
      15  GCC is distributed in the hope that it will be useful, but WITHOUT ANY
      16  WARRANTY; without even the implied warranty of MERCHANTABILITY or
      17  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      18  for more details.
      19  
      20  Under Section 7 of GPL version 3, you are granted additional
      21  permissions described in the GCC Runtime Library Exception, version
      22  3.1, as published by the Free Software Foundation.
      23  
      24  You should have received a copy of the GNU General Public License and
      25  a copy of the GCC Runtime Library Exception along with this program;
      26  see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      27  <http://www.gnu.org/licenses/>.  */
      28  
      29  /*	This file contains definitions and declarations of things
      30  	relating to the normal start-up-time invocation of C++
      31  	file-scope static object constructors.  These declarations
      32  	and definitions are used by *both* libgcc2.c and by crtstuff.c.
      33  
      34  	Note that this file should only be compiled with GCC.
      35  */
      36  
      37  #ifndef GCC_GBL_CTORS_H
      38  #define GCC_GBL_CTORS_H
      39  
      40  /*  Declare a pointer to void function type.  */
      41  
      42  typedef void (*func_ptr) (void);
      43  
      44  /* Declare the set of symbols use as begin and end markers for the lists
      45     of global object constructors and global object destructors.  */
      46  
      47  extern func_ptr __CTOR_LIST__[];
      48  extern func_ptr __DTOR_LIST__[];
      49  
      50  /* Declare the routine which needs to get invoked at program start time.  */
      51  
      52  extern void __do_global_ctors (void);
      53  
      54  /* Declare the routine which needs to get invoked at program exit time.  */
      55  
      56  extern void __do_global_dtors (void);
      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  /* Some systems place the number of pointers
      67     in the first word of the table.
      68     On other systems, that word is -1.
      69     In all cases, the table is null-terminated.
      70     If the length is not recorded, count up to the null.  */
      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 {									\
      77    __SIZE_TYPE__ nptrs = (__SIZE_TYPE__) __CTOR_LIST__[0];		\
      78    unsigned i;								\
      79    if (nptrs == (__SIZE_TYPE__)-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)
      84  #endif
      85  
      86  #endif /* GCC_GBL_CTORS_H */