GOOPS cosmetics
[bpt/guile.git] / lib / alloca.in.h
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1/* Memory allocation on the stack.
2
5e69ceb7 3 Copyright (C) 1995, 1999, 2001-2004, 2006-2014 Free Software Foundation,
61cd9dc9 4 Inc.
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5
6 This program is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser 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
49114fd4 14 Lesser General Public License for more details.
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15
16 You should have received a copy of the GNU Lesser General Public
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17 License along with this program; if not, see
18 <http://www.gnu.org/licenses/>.
19 */
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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
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47# elif defined __TANDEM && defined _TNS_E_TARGET
48# ifdef __cplusplus
49extern "C"
50# endif
51void *_alloca (unsigned short);
52# pragma intrinsic (_alloca)
53# define alloca _alloca
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54# else
55# include <stddef.h>
56# ifdef __cplusplus
57extern "C"
58# endif
59void *alloca (size_t);
60# endif
61#endif
62
63#endif /* _GL_ALLOCA_H */