| 1 | /* Memory allocation on the stack.
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| 2 |
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| 3 | Copyright (C) 1995, 1999, 2001, 2002, 2003, 2004, 2006 Free Software
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| 4 | Foundation, Inc.
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| 5 |
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| 6 | This program is free software; you can redistribute it and/or modify it
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| 7 | under the terms of the GNU General Public License as published
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| 8 | by the Free Software Foundation; either version 2, or (at your option)
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| 9 | any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 14 | General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public
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| 17 | License along with this program; if not, write to the Free Software
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| 18 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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| 19 | USA. */
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| 20 |
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| 21 | /* Avoid using the symbol _ALLOCA_H here, as Bison assumes _ALLOCA_H
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| 22 | means there is a real alloca function. */
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| 23 | #ifndef _GNULIB_ALLOCA_H
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| 24 | # define _GNULIB_ALLOCA_H
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| 25 |
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| 26 | /* alloca (N) returns a pointer to N bytes of memory
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| 27 | allocated on the stack, which will last until the function returns.
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| 28 | Use of alloca should be avoided:
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| 29 | - inside arguments of function calls - undefined behaviour,
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| 30 | - in inline functions - the allocation may actually last until the
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| 31 | calling function returns,
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| 32 | - for huge N (say, N >= 65536) - you never know how large (or small)
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| 33 | the stack is, and when the stack cannot fulfill the memory allocation
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| 34 | request, the program just crashes.
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| 35 | */
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| 36 |
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| 37 | #ifndef alloca
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| 38 | # ifdef __GNUC__
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| 39 | # define alloca __builtin_alloca
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| 40 | # elif defined _AIX
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| 41 | # define alloca __alloca
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| 42 | # elif defined _MSC_VER
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| 43 | # include <malloc.h>
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| 44 | # define alloca _alloca
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| 45 | # else
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| 46 | # include <stddef.h>
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| 47 | # ifdef __cplusplus
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| 48 | extern "C"
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| 49 | # endif
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| 50 | void *alloca (size_t);
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| 51 | # endif
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| 52 | #endif
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| 53 |
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| 54 | #endif /* _GNULIB_ALLOCA_H */
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