Subversion Repositories openrisc

/* Implementation of the EXTENDS_TYPE_OF intrinsic.

   Copyright (C) 2004, 2007, 2009, 2011 Free Software Foundation, Inc.

   Contributed by Janus Weil <janus@gcc.gnu.org>.

This file is part of the GNU Fortran runtime library (libgfortran).

Libgfortran 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.

Libgfortran 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.

Under Section 7 of GPL version 3, you are granted additional

permissions described in the GCC Runtime Library Exception, version

3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and

a copy of the GCC Runtime Library Exception along with this program;

see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

<http://www.gnu.org/licenses/>.  */

#include "libgfortran.h"

#include <stdlib.h>

typedef struct vtype

{

  GFC_INTEGER_4 hash;

  GFC_INTEGER_4 size;

  struct vtype *extends;

}

vtype;

extern GFC_LOGICAL_4 is_extension_of (struct vtype *, struct vtype *);

export_proto(is_extension_of);

/* This is a helper function for the F2003 intrinsic EXTENDS_TYPE_OF.

   While EXTENDS_TYPE_OF accepts CLASS or TYPE arguments, this one here gets

   passed the corresponding vtabs. Each call to EXTENDS_TYPE_OF is translated

   to a call to is_extension_of.  */

GFC_LOGICAL_4

is_extension_of (struct vtype *v1, struct vtype *v2)

{

  while (v1)

    {

      if (v1->hash == v2->hash) return 1;

      v1 = v1->extends;

    }

  return 0;

}