/* Memory allocation on the stack.

   Copyright (C) 1995, 1999, 2001-2007, 2015 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 */