| /* Memory allocation on the stack. | |
| Copyright (C) 1995, 1999, 2001-2004, 2006-2023 Free Software Foundation, | |
| Inc. | |
| This file is free software: you can redistribute it and/or modify | |
| it under the terms of the GNU Lesser General Public License as | |
| published by the Free Software Foundation; either version 2.1 of the | |
| License, or (at your option) any later version. | |
| This file is distributed in the hope that it will be useful, | |
| but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| GNU Lesser General Public License for more details. | |
| You should have received a copy of the GNU Lesser General Public License | |
| along with this program. If not, see <https://www.gnu.org/licenses/>. */ | |
| /* Avoid using the symbol _ALLOCA_H here, as Bison assumes _ALLOCA_H | |
| means there is a real alloca function. */ | |
| /* alloca (N) returns a pointer to N bytes of memory | |
| allocated on the stack, which will last until the function returns. | |
| Use of alloca should be avoided: | |
| - inside arguments of function calls - undefined behaviour, | |
| - in inline functions - the allocation may actually last until the | |
| calling function returns, | |
| - for huge N (say, N >= 65536) - you never know how large (or small) | |
| the stack is, and when the stack cannot fulfill the memory allocation | |
| request, the program just crashes. | |
| */ | |
| /* Some version of mingw have an <alloca.h> that causes trouble when | |
| included after 'alloca' gets defined as a macro. As a workaround, | |
| include this <alloca.h> first and define 'alloca' as a macro afterwards | |
| if needed. */ | |
| # include_next <alloca.h> | |
| extern "C" | |
| void *_alloca (unsigned short); | |
| extern "C" | |
| void *alloca (size_t); | |