HCoop / bpt / emacs.git / blame
| Commit | Line | Data |
|---|---|---|
| fa23e171 PE |
1 | /* Memory allocation on the stack. |
| 2 | ||
| ba318903 | 3 | Copyright (C) 1995, 1999, 2001-2004, 2006-2014 Free Software Foundation, |
| fa23e171 PE |
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 | |
| caf8a9b2 PE |
17 | License along with this program; if not, see |
| 18 | <http://www.gnu.org/licenses/>. | |
| 19 | */ | |
| fa23e171 PE |
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 | |
| 013aabf1 PE |
47 | # elif defined __TANDEM && defined _TNS_E_TARGET |
| 48 | # ifdef __cplusplus | |
| 49 | extern "C" | |
| 50 | # endif | |
| 51 | void *_alloca (unsigned short); | |
| 52 | # pragma intrinsic (_alloca) | |
| 53 | # define alloca _alloca | |
| fa23e171 PE |
54 | # else |
| 55 | # include <stddef.h> | |
| 56 | # ifdef __cplusplus | |
| 57 | extern "C" | |
| 58 | # endif | |
| 59 | void *alloca (size_t); | |
| 60 | # endif | |
| 61 | #endif | |
| 62 | ||
| 63 | #endif /* _GL_ALLOCA_H */ |