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Import gmp 3.1

/* Stack allocation routines.  This is intended for machines without support
   for the `alloca' function.

Copyright (C) 1996, 2000 Free Software Foundation, Inc.

This file is part of the GNU MP Library.

The GNU MP Library 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.

The GNU MP Library 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 the GNU MP Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */

struct tmp_stack
{
  void *end;
  void *alloc_point;
  struct tmp_stack *prev;
};

struct tmp_marker
{
  struct tmp_stack *which_chunk;
  void *alloc_point;
};

typedef struct tmp_marker tmp_marker;

#if defined (__cplusplus)
extern "C" {
#endif

#if __STDC__
void *__gmp_tmp_alloc (unsigned long);
void __gmp_tmp_mark (tmp_marker *);
void __gmp_tmp_free (tmp_marker *);
#else
void *__gmp_tmp_alloc ();
void __gmp_tmp_mark ();
void __gmp_tmp_free ();
#endif

#if defined (__cplusplus)
}
#endif

#ifndef __TMP_ALIGN
#define __TMP_ALIGN 8
#endif

#define TMP_DECL(marker) tmp_marker marker
#define TMP_ALLOC(size) \
  __gmp_tmp_alloc (((unsigned long) (size) + __TMP_ALIGN - 1) & -__TMP_ALIGN)
#define TMP_MARK(marker) __gmp_tmp_mark (&marker)
#define TMP_FREE(marker) __gmp_tmp_free (&marker)