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7c1dab0d | 1 | /* Implementation of the EXTENDS_TYPE_OF intrinsic. |
cbe34bb5 | 2 | Copyright (C) 2004-2017 Free Software Foundation, Inc. |
7c1dab0d JW |
3 | Contributed by Janus Weil <janus@gcc.gnu.org>. |
4 | ||
74544378 | 5 | This file is part of the GNU Fortran runtime library (libgfortran). |
7c1dab0d JW |
6 | |
7 | Libgfortran is free software; you can redistribute it and/or | |
8 | modify it under the terms of the GNU General Public | |
9 | License as published by the Free Software Foundation; either | |
10 | version 3 of the License, or (at your option) any later version. | |
11 | ||
12 | Libgfortran is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | Under Section 7 of GPL version 3, you are granted additional | |
18 | permissions described in the GCC Runtime Library Exception, version | |
19 | 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | You should have received a copy of the GNU General Public License and | |
22 | a copy of the GCC Runtime Library Exception along with this program; | |
23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | <http://www.gnu.org/licenses/>. */ | |
25 | ||
26 | ||
27 | #include "libgfortran.h" | |
7c1dab0d JW |
28 | |
29 | ||
30 | typedef struct vtype | |
31 | { | |
32 | GFC_INTEGER_4 hash; | |
c1e9bbcc | 33 | GFC_INTEGER_4 size; |
7c1dab0d JW |
34 | struct vtype *extends; |
35 | } | |
36 | vtype; | |
37 | ||
38 | ||
39 | extern GFC_LOGICAL_4 is_extension_of (struct vtype *, struct vtype *); | |
40 | export_proto(is_extension_of); | |
41 | ||
42 | ||
43 | /* This is a helper function for the F2003 intrinsic EXTENDS_TYPE_OF. | |
44 | While EXTENDS_TYPE_OF accepts CLASS or TYPE arguments, this one here gets | |
45 | passed the corresponding vtabs. Each call to EXTENDS_TYPE_OF is translated | |
46 | to a call to is_extension_of. */ | |
47 | ||
48 | GFC_LOGICAL_4 | |
49 | is_extension_of (struct vtype *v1, struct vtype *v2) | |
50 | { | |
8b704316 PT |
51 | /* Assume that only unlimited polymorphic entities will pass NULL v1 or v2 |
52 | if they are unallocated or disassociated. */ | |
53 | ||
54 | if (!v2) | |
55 | return 1; | |
56 | if (!v1) | |
57 | return 0; | |
58 | ||
7c1dab0d JW |
59 | while (v1) |
60 | { | |
61 | if (v1->hash == v2->hash) return 1; | |
62 | v1 = v1->extends; | |
63 | } | |
64 | return 0; | |
65 | } |