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398
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1 /* Memory allocation on the stack.
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2
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3 Copyright (C) 1995, 1999, 2001-2004, 2006-2010 Free Software Foundation,
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4 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 3, 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 _GL_ALLOCA_H
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24 #define _GL_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 # elif defined __DECC && defined __VMS
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46 # define alloca __ALLOCA
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47 # else
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48 # include <stddef.h>
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49 # ifdef __cplusplus
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50 extern "C"
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51 # endif
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52 void *alloca (size_t);
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53 # endif
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54 #endif
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55
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56 #endif /* _GL_ALLOCA_H */
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