1 /* Memory allocation on the stack.
3 Copyright (C) 1995, 1999, 2001-2004, 2006-2012 Free Software Foundation,
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)
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.
16 You should have received a copy of the GNU General Public
17 License along with this program; if not, see
18 <http://www.gnu.org/licenses/>.
21 /* Avoid using the symbol _ALLOCA_H here, as Bison assumes _ALLOCA_H
22 means there is a real alloca function. */
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.
39 # define alloca __builtin_alloca
41 # define alloca __alloca
42 # elif defined _MSC_VER
44 # define alloca _alloca
45 # elif defined __DECC && defined __VMS
46 # define alloca __ALLOCA
47 # elif defined __TANDEM && defined _TNS_E_TARGET
51 void *_alloca (unsigned short);
52 # pragma intrinsic (_alloca)
53 # define alloca _alloca
59 void *alloca (size_t);
63 #endif /* _GL_ALLOCA_H */
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