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66e9b712 RM |
1 | /* Memory allocation on the stack. |
2 | ||
3 | Copyright (C) 1995, 1999, 2001-2004, 2006-2008 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 _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 */ |