1/* Memory allocation on the stack.
2
3   Copyright (C) 1995, 1999, 2001, 2002, 2003, 2004, 2006, 2007, 2008,
4   2009 Free Software 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 3, 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 _GL_ALLOCA_H
24#define _GL_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# elif defined __DECC && defined __VMS
46#  define alloca __ALLOCA
47# else
48#  include <stddef.h>
49#  ifdef  __cplusplus
50extern "C"
51#  endif
52void *alloca (size_t);
53# endif
54#endif
55
56#endif /* _GL_ALLOCA_H */
57