| /* Memory allocation on the stack. |
| Copyright (C) 1995, 1999, 2001-2007 Free Software Foundation, Inc. |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program 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 General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| /* When this file is included, it may be preceded only by preprocessor |
| declarations. Thanks to AIX. Therefore we include it right after |
| "config.h", not later. */ |
| |
| /* Avoid using the symbol _ALLOCA_H here, as Bison assumes _ALLOCA_H |
| means there is a real alloca function. */ |
| #ifndef _GL_ALLOCA_H |
| #define _GL_ALLOCA_H |
| |
| /* alloca(N) returns a pointer (void* or char*) to N bytes of memory |
| allocated on the stack, and 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. |
| */ |
| |
| #ifndef alloca |
| # ifdef __GNUC__ |
| # define alloca __builtin_alloca |
| # else |
| # ifdef _MSC_VER |
| # include <malloc.h> |
| # define alloca _alloca |
| # else |
| # if HAVE_ALLOCA_H |
| # include <alloca.h> |
| # else |
| # ifdef _AIX |
| #pragma alloca |
| # else |
| # ifdef __hpux /* This section must match that of bison generated files. */ |
| # ifdef __cplusplus |
| extern "C" void *alloca (unsigned int); |
| # else /* not __cplusplus */ |
| extern void *alloca (); |
| # endif /* not __cplusplus */ |
| # else /* not __hpux */ |
| # ifndef alloca |
| extern char *alloca (); |
| # endif |
| # endif /* __hpux */ |
| # endif |
| # endif |
| # endif |
| # endif |
| #endif |
| |
| #endif /* _GL_ALLOCA_H */ |