1: /* Memory allocation on the stack.
    2: 
    3:    Copyright (C) 1995, 1999, 2001, 2002, 2003, 2004, 2006 Free Software
    4:    Foundation, Inc.
    5: 
    6:    This program is free software; you can redistribute it and/or modify it
    7:    under the terms of the GNU General Public License as published
    8:    by the Free Software Foundation; either version 2, or (at your option)
    9:    any later version.
   10: 
   11:    This program is distributed in the hope that it will be useful,
   12:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   13:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   14:    General Public License for more details.
   15: 
   16:    You should have received a copy of the GNU General Public
   17:    License along with this program; if not, write to the Free Software
   18:    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
   19:    USA.  */
   20: 
   21: /* Avoid using the symbol _ALLOCA_H here, as Bison assumes _ALLOCA_H
   22:    means there is a real alloca function.  */
   23: #ifndef _GNULIB_ALLOCA_H
   24: # define _GNULIB_ALLOCA_H
   25: 
   26: /* alloca (N) returns a pointer to N bytes of memory
   27:    allocated on the stack, which will last until the function returns.
   28:    Use of alloca should be avoided:
   29:      - inside arguments of function calls - undefined behaviour,
   30:      - in inline functions - the allocation may actually last until the
   31:        calling function returns,
   32:      - for huge N (say, N >= 65536) - you never know how large (or small)
   33:        the stack is, and when the stack cannot fulfill the memory allocation
   34:        request, the program just crashes.
   35:  */
   36: 
   37: #ifndef alloca
   38: # ifdef __GNUC__
   39: #  define alloca __builtin_alloca
   40: # elif defined _AIX
   41: #  define alloca __alloca
   42: # elif defined _MSC_VER
   43: #  include <malloc.h>
   44: #  define alloca _alloca
   45: # else
   46: #  include <stddef.h>
   47: #  ifdef  __cplusplus
   48: extern "C"
   49: #  endif
   50: void *alloca (size_t);
   51: # endif
   52: #endif
   53: 
   54: #endif /* _GNULIB_ALLOCA_H */