blob: af274b9e75387b61c3b588bafa3f7c327a999e78 [file] [log] [blame]
/* Memory allocation on the stack.
Copyright (C) 1995, 1999, 2001-2004, 2006-2007 Free Software
Foundation, Inc.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
General Public License for more details.
You should have received a copy of the GNU General Public
License along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
USA. */
/* Avoid using the symbol _ALLOCA_H here, as Bison assumes _ALLOCA_H
means there is a real alloca function. */
#ifndef _GL_ALLOCA_H
#define _GL_ALLOCA_H
/* alloca (N) returns a pointer to N bytes of memory
allocated on the stack, which will last until the function returns.
Use of alloca should be avoided:
- inside arguments of function calls - undefined behaviour,
- in inline functions - the allocation may actually last until the
calling function returns,
- for huge N (say, N >= 65536) - you never know how large (or small)
the stack is, and when the stack cannot fulfill the memory allocation
request, the program just crashes.
#ifndef alloca
# ifdef __GNUC__
# define alloca __builtin_alloca
# elif defined _AIX
# define alloca __alloca
# elif defined _MSC_VER
# include <malloc.h>
# define alloca _alloca
# else
# include <stddef.h>
# ifdef __cplusplus
extern "C"
# endif
void *alloca (size_t);
# endif
#endif /* _GL_ALLOCA_H */