|
421
|
1 /* Memory allocation on the stack.
|
|
|
2
|
|
|
3 Copyright (C) 1995, 1999, 2001-2004, 2006-2010 Free Software Foundation,
|
|
|
4 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
|
|
|
50 extern "C"
|
|
|
51 # endif
|
|
|
52 void *alloca (size_t);
|
|
|
53 # endif
|
|
|
54 #endif
|
|
|
55
|
|
|
56 #endif /* _GL_ALLOCA_H */
|
