Branch data 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 : 3637858 : __libdw_formref (Dwarf_Attribute *attr, Dwarf_Off *return_offset)
40 : : {
41 : 3637858 : const unsigned char *datap = attr->valp;
42 : 3637858 : const unsigned char *endp = attr->cu->endp;
43 : :
44 [ - + ]: 3637858 : if (attr->valp == NULL)
45 : : {
46 : 0 : __libdw_seterrno (DWARF_E_INVALID_REFERENCE);
47 : 0 : return -1;
48 : : }
49 : :
50 [ + - + - : 3637858 : switch (attr->form)
+ - - ]
51 : : {
52 : 14 : case DW_FORM_ref1:
53 [ - + ]: 14 : if (datap + 1 > endp)
54 : : {
55 : 0 : invalid:
56 : 0 : __libdw_seterrno (DWARF_E_INVALID_DWARF);
57 : 0 : return -1;
58 : : }
59 : 14 : *return_offset = *attr->valp;
60 : 14 : break;
61 : :
62 : 0 : case DW_FORM_ref2:
63 [ # # ]: 0 : if (datap + 2 > endp)
64 : : goto invalid;
65 [ # # ]: 0 : *return_offset = read_2ubyte_unaligned (attr->cu->dbg, attr->valp);
66 : 0 : break;
67 : :
68 : 3637823 : case DW_FORM_ref4:
69 [ - + ]: 3637823 : if (datap + 4 > endp)
70 : : goto invalid;
71 [ + + ]: 3637823 : *return_offset = read_4ubyte_unaligned (attr->cu->dbg, attr->valp);
72 : 3637823 : break;
73 : :
74 : 0 : 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 : 21 : case DW_FORM_ref_udata:
81 [ - + ]: 21 : if (datap + 1 > endp)
82 : : goto invalid;
83 : 21 : get_uleb128 (*return_offset, datap, endp);
84 : 21 : break;
85 : :
86 : 0 : 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 : 0 : 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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