/*
 * Copyright (c) 2002, The Tendra Project <http://www.ten15.org/>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice unmodified, this list of conditions, and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 *    		 Crown Copyright (c) 1997
 *    
 *    This TenDRA(r) Computer Program is subject to Copyright
 *    owned by the United Kingdom Secretary of State for Defence
 *    acting through the Defence Evaluation and Research Agency
 *    (DERA).  It is made available to Recipients with a
 *    royalty-free licence for its use, reproduction, transfer
 *    to other parties and amendment for any purpose not excluding
 *    product development provided that any such use et cetera
 *    shall be deemed to be acceptance of the following conditions:-
 *    
 *        (1) Its Recipients shall ensure that this Notice is
 *        reproduced upon any copies or amended versions of it;
 *    
 *        (2) Any amended version of it shall be clearly marked to
 *        show both the nature of and the organisation responsible
 *        for the relevant amendment or amendments;
 *    
 *        (3) Its onward transfer from a recipient to another
 *        party shall be deemed to be that party's acceptance of
 *        these conditions;
 *    
 *        (4) DERA gives no warranty or assurance as to its
 *        quality or suitability for any purpose and DERA accepts
 *        no liability whatsoever in relation to any use to which
 *        it may be put.
 *
 * $TenDRA: tendra/src/installers/alpha/common/spec.c,v 1.2 2003/12/11 20:25:57 stefanf Exp $
 */

/**********************************************************************

                               spec.c

  Defines special_fn which recognises and replaces some special
  function calls.

 **********************************************************************/

#include "config.h"
#include "common_types.h"
#include "tags.h"
#include "externs.h"
#include "expmacs.h"
#include "shapemacs.h"
#include "exp.h"
#include "basicread.h"
#include "flags.h"
#include "table_fns.h"
#include "installglob.h"
#include "spec.h"


speci
special_fn(exp a1, exp a2, shape s)
{
  /* look for special functions */
  speci spr;
#if 0
  dec* dp = brog (son (a1));
  char *id = dp -> dec_u.dec_val.dec_id;
  spr.is_special = 0;
  if (id == (char *) 0)
    return (spr);
  /* at present the detection of special cases is done on the identifiers,
     but it really ought to be on special tokens, as for diagnostics */

  if (!strcmp (id, "setjmp"))
    has_setjmp = 1;

  if (a2 != nilexp && last(a2) && ( (do_alloca && !strcmp (id, "alloca"))
  			 || !strcmp (id, "__builtin_alloca"))) {
    exp r = getexp (s, nilexp, 0, a2, nilexp, 0,
	(long) 0, alloca_tag);
    setfather(r, son(r));
    has_alloca = 1;
    spr.is_special = 1;
    spr.special_exp = r;
    kill_exp (a1, a1);
    return (spr);
  };
  return (spr);
#endif
  spr.is_special=0;
  return spr;
}
