62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/* Implementation of the EXTENDS_TYPE_OF intrinsic.
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Copyright (C) 2004, 2007, 2009 Free Software Foundation, Inc.
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Contributed by Janus Weil <janus@gcc.gnu.org>.
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This file is part of the GNU Fortran 95 runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgfortran.h"
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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typedef struct vtype
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{
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GFC_INTEGER_4 hash;
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GFC_INTEGER_4 size;
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struct vtype *extends;
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}
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vtype;
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extern GFC_LOGICAL_4 is_extension_of (struct vtype *, struct vtype *);
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export_proto(is_extension_of);
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/* This is a helper function for the F2003 intrinsic EXTENDS_TYPE_OF.
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While EXTENDS_TYPE_OF accepts CLASS or TYPE arguments, this one here gets
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passed the corresponding vtabs. Each call to EXTENDS_TYPE_OF is translated
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to a call to is_extension_of. */
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GFC_LOGICAL_4
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is_extension_of (struct vtype *v1, struct vtype *v2)
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{
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while (v1)
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{
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if (v1->hash == v2->hash) return 1;
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v1 = v1->extends;
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}
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return 0;
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}
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