/src/elfutils/libdw/dwarf_formsdata.c
Line | Count | Source (jump to first uncovered line) |
1 | | /* Return signed constant represented by attribute. |
2 | | Copyright (C) 2003, 2005, 2014, 2017 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 | | |
38 | | int |
39 | | dwarf_formsdata (Dwarf_Attribute *attr, Dwarf_Sword *return_sval) |
40 | 0 | { |
41 | 0 | if (attr == NULL) |
42 | 0 | return -1; |
43 | | |
44 | 0 | const unsigned char *datap = attr->valp; |
45 | 0 | const unsigned char *endp = attr->cu->endp; |
46 | |
|
47 | 0 | switch (attr->form) |
48 | 0 | { |
49 | 0 | case DW_FORM_data1: |
50 | 0 | if (datap + 1 > endp) |
51 | 0 | { |
52 | 0 | invalid: |
53 | 0 | __libdw_seterrno (DWARF_E_INVALID_DWARF); |
54 | 0 | return -1; |
55 | 0 | } |
56 | 0 | *return_sval = (signed char) *attr->valp; |
57 | 0 | break; |
58 | | |
59 | 0 | case DW_FORM_data2: |
60 | 0 | if (datap + 2 > endp) |
61 | 0 | goto invalid; |
62 | 0 | *return_sval = read_2sbyte_unaligned (attr->cu->dbg, attr->valp); |
63 | 0 | break; |
64 | | |
65 | 0 | case DW_FORM_data4: |
66 | 0 | if (datap + 4 > endp) |
67 | 0 | goto invalid; |
68 | 0 | *return_sval = read_4sbyte_unaligned (attr->cu->dbg, attr->valp); |
69 | 0 | break; |
70 | | |
71 | 0 | case DW_FORM_data8: |
72 | 0 | if (datap + 8 > endp) |
73 | 0 | goto invalid; |
74 | 0 | *return_sval = read_8sbyte_unaligned (attr->cu->dbg, attr->valp); |
75 | 0 | break; |
76 | | |
77 | 0 | case DW_FORM_sdata: |
78 | 0 | if (datap + 1 > endp) |
79 | 0 | goto invalid; |
80 | 0 | get_sleb128 (*return_sval, datap, endp); |
81 | 0 | break; |
82 | | |
83 | 0 | case DW_FORM_udata: |
84 | 0 | if (datap + 1 > endp) |
85 | 0 | goto invalid; |
86 | 0 | get_uleb128 (*return_sval, datap, endp); |
87 | 0 | break; |
88 | | |
89 | 0 | case DW_FORM_implicit_const: |
90 | | // The data comes from the abbrev, which has been bounds checked. |
91 | 0 | get_sleb128_unchecked (*return_sval, datap); |
92 | 0 | break; |
93 | | |
94 | 0 | default: |
95 | 0 | __libdw_seterrno (DWARF_E_NO_CONSTANT); |
96 | 0 | return -1; |
97 | 0 | } |
98 | | |
99 | 0 | return 0; |
100 | 0 | } |
101 | | INTDEF(dwarf_formsdata) |