mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-25 11:37:56 +00:00
55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/* Memory allocation on the stack.
|
|
|
|
Copyright (C) 1995, 1999, 2001, 2002, 2003, 2004 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
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
|
|
USA. */
|
|
|
|
/* When this file is included, it may be preceded only by preprocessor
|
|
declarations. Thanks to AIX. Therefore we include it right after
|
|
"config.h", not later. */
|
|
|
|
#ifndef _ALLOCA_H
|
|
# define _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.
|
|
*/
|
|
|
|
#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 /* _ALLOCA_H */
|