Line data Source code
1 : /* Return reference offset represented by attribute.
2 : Copyright (C) 2003-2010, 2014 Red Hat, Inc.
3 : This file is part of elfutils.
4 : Written by Ulrich Drepper <drepper@redhat.com>, 2003.
5 :
6 : This file is free software; you can redistribute it and/or modify
7 : it under the terms of either
8 :
9 : * the GNU Lesser General Public License as published by the Free
10 : Software Foundation; either version 3 of the License, or (at
11 : your option) any later version
12 :
13 : or
14 :
15 : * the GNU General Public License as published by the Free
16 : Software Foundation; either version 2 of the License, or (at
17 : your option) any later version
18 :
19 : or both in parallel, as here.
20 :
21 : elfutils is distributed in the hope that it will be useful, but
22 : WITHOUT ANY WARRANTY; without even the implied warranty of
23 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 : General Public License for more details.
25 :
26 : You should have received copies of the GNU General Public License and
27 : the GNU Lesser General Public License along with this program. If
28 : not, see <http://www.gnu.org/licenses/>. */
29 :
30 : #ifdef HAVE_CONFIG_H
31 : # include <config.h>
32 : #endif
33 :
34 : #include <dwarf.h>
35 : #include "libdwP.h"
36 :
37 : int
38 : internal_function
39 7305498 : __libdw_formref (Dwarf_Attribute *attr, Dwarf_Off *return_offset)
40 : {
41 7305498 : const unsigned char *datap = attr->valp;
42 7305498 : const unsigned char *endp = attr->cu->endp;
43 :
44 7305498 : if (attr->valp == NULL)
45 : {
46 0 : __libdw_seterrno (DWARF_E_INVALID_REFERENCE);
47 0 : return -1;
48 : }
49 :
50 7305498 : switch (attr->form)
51 : {
52 : case DW_FORM_ref1:
53 397 : if (datap + 1 > endp)
54 : {
55 : invalid:
56 0 : __libdw_seterrno (DWARF_E_INVALID_DWARF);
57 0 : return -1;
58 : }
59 397 : *return_offset = *attr->valp;
60 397 : break;
61 :
62 : case DW_FORM_ref2:
63 5197 : if (datap + 2 > endp)
64 : goto invalid;
65 5197 : *return_offset = read_2ubyte_unaligned (attr->cu->dbg, attr->valp);
66 5197 : break;
67 :
68 : case DW_FORM_ref4:
69 7287241 : if (datap + 4 > endp)
70 : goto invalid;
71 7341810 : *return_offset = read_4ubyte_unaligned (attr->cu->dbg, attr->valp);
72 7287241 : break;
73 :
74 : case DW_FORM_ref8:
75 0 : if (datap + 8 > endp)
76 : goto invalid;
77 0 : *return_offset = read_8ubyte_unaligned (attr->cu->dbg, attr->valp);
78 0 : break;
79 :
80 : case DW_FORM_ref_udata:
81 12663 : if (datap + 1 > endp)
82 : goto invalid;
83 12663 : get_uleb128 (*return_offset, datap, endp);
84 12663 : break;
85 :
86 : case DW_FORM_ref_addr:
87 : case DW_FORM_ref_sig8:
88 : case DW_FORM_GNU_ref_alt:
89 : case DW_FORM_ref_sup4:
90 : case DW_FORM_ref_sup8:
91 : /* These aren't handled by dwarf_formref, only by dwarf_formref_die. */
92 0 : __libdw_seterrno (DWARF_E_INVALID_REFERENCE);
93 0 : return -1;
94 :
95 : default:
96 0 : __libdw_seterrno (DWARF_E_NO_REFERENCE);
97 0 : return -1;
98 : }
99 :
100 : return 0;
101 : }
102 :
103 : /* This is the old public entry point.
104 : It is now deprecated in favor of dwarf_formref_die. */
105 : int
106 0 : dwarf_formref (Dwarf_Attribute *attr, Dwarf_Off *return_offset)
107 : {
108 0 : if (attr == NULL)
109 : return -1;
110 :
111 0 : return __libdw_formref (attr, return_offset);
112 : }
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