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8690e634 JK |
1 | /* Memory allocation on the stack. |
2 | ||
5df4cba6 | 3 | Copyright (C) 1995, 1999, 2001-2004, 2006-2020 Free Software Foundation, |
8690e634 JK |
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, see | |
c0c3707f | 18 | <https://www.gnu.org/licenses/>. |
8690e634 JK |
19 | */ |
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__ | |
c0c3707f CB |
39 | /* Some version of mingw have an <alloca.h> that causes trouble when |
40 | included after 'alloca' gets defined as a macro. As a workaround, include | |
41 | this <alloca.h> first and define 'alloca' as a macro afterwards. */ | |
42 | # if (defined _WIN32 && ! defined __CYGWIN__) && @HAVE_ALLOCA_H@ | |
43 | # include_next <alloca.h> | |
44 | # endif | |
8690e634 JK |
45 | # define alloca __builtin_alloca |
46 | # elif defined _AIX | |
47 | # define alloca __alloca | |
48 | # elif defined _MSC_VER | |
49 | # include <malloc.h> | |
50 | # define alloca _alloca | |
51 | # elif defined __DECC && defined __VMS | |
52 | # define alloca __ALLOCA | |
a512b375 JB |
53 | # elif defined __TANDEM && defined _TNS_E_TARGET |
54 | # ifdef __cplusplus | |
55 | extern "C" | |
56 | # endif | |
57 | void *_alloca (unsigned short); | |
58 | # pragma intrinsic (_alloca) | |
59 | # define alloca _alloca | |
49e4877c PA |
60 | # elif defined __MVS__ |
61 | # include <stdlib.h> | |
8690e634 JK |
62 | # else |
63 | # include <stddef.h> | |
64 | # ifdef __cplusplus | |
65 | extern "C" | |
66 | # endif | |
67 | void *alloca (size_t); | |
68 | # endif | |
69 | #endif | |
70 | ||
71 | #endif /* _GL_ALLOCA_H */ |