/* Memory allocation on the stack.

   Copyright (C) 1995, 1999, 2001-2004, 2006-2019 Free Software Foundation,

   Inc.

   This program 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, 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

   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.  */

#ifndef _GL_ALLOCA_H

#define _GL_ALLOCA_H

/* 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.

 */

#ifndef alloca

# ifdef __GNUC__

   /* 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 (defined _WIN32 && ! defined __CYGWIN__) && @HAVE_ALLOCA_H@

#   include_next <alloca.h>

#  endif

#  define alloca __builtin_alloca

# elif defined _AIX

#  define alloca __alloca

# elif defined _MSC_VER

#  include <malloc.h>

#  define alloca _alloca

# elif defined __DECC && defined __VMS

#  define alloca __ALLOCA

# elif defined __TANDEM && defined _TNS_E_TARGET

#  ifdef  __cplusplus

extern "C"

#  endif

void *_alloca (unsigned short);

#  pragma intrinsic (_alloca)

#  define alloca _alloca

# elif defined __MVS__

#  include <stdlib.h>

# else

#  include <stddef.h>

#  ifdef  __cplusplus

extern "C"

#  endif

void *alloca (size_t);

# endif

#endif

#endif /* _GL_ALLOCA_H */