Branch data Line data Source code
1 : : /* Get attributes of the DIE.
2 : : Copyright (C) 2004, 2005, 2008, 2009 Red Hat, Inc.
3 : : This file is part of elfutils.
4 : : Written by Ulrich Drepper <drepper@redhat.com>, 2004.
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 "libdwP.h"
35 : :
36 : :
37 : : ptrdiff_t
38 : 721679 : dwarf_getattrs (Dwarf_Die *die, int (*callback) (Dwarf_Attribute *, void *),
39 : : void *arg, ptrdiff_t offset)
40 : : {
41 [ + - ]: 721679 : if (die == NULL)
42 : : return -1l;
43 : :
44 [ + - ]: 721679 : if (unlikely (offset == 1))
45 : : return 1;
46 : :
47 : 721679 : const unsigned char *die_addr = die->addr;
48 : :
49 : : /* Get the abbreviation code. */
50 : : unsigned int u128;
51 [ + + ]: 721679 : get_uleb128 (u128, die_addr);
52 : :
53 [ - + ]: 721679 : if (die->abbrev == NULL)
54 : : /* Find the abbreviation. */
55 : 0 : die->abbrev = __libdw_findabbrev (die->cu, u128);
56 : :
57 [ - + ]: 721679 : if (unlikely (die->abbrev == DWARF_END_ABBREV))
58 : : {
59 : : invalid_dwarf:
60 : 0 : __libdw_seterrno (DWARF_E_INVALID_DWARF);
61 : : return -1l;
62 : : }
63 : :
64 : : /* This is where the attributes start. */
65 : 721679 : const unsigned char *attrp = die->abbrev->attrp;
66 : 721679 : const unsigned char *const offset_attrp = die->abbrev->attrp + offset;
67 : :
68 : : /* Go over the list of attributes. */
69 : 721679 : Dwarf *dbg = die->cu->dbg;
70 : : while (1)
71 : : {
72 : : /* Are we still in bounds? */
73 [ + - ]: 3269564 : if (unlikely (attrp
74 : : >= ((unsigned char *) dbg->sectiondata[IDX_debug_abbrev]->d_buf
75 : : + dbg->sectiondata[IDX_debug_abbrev]->d_size)))
76 : : goto invalid_dwarf;
77 : :
78 : : /* Get attribute name and form. */
79 : : Dwarf_Attribute attr;
80 : 3269564 : const unsigned char *remembered_attrp = attrp;
81 : :
82 : : // XXX Fix bound checks
83 [ + + ]: 3269564 : get_uleb128 (attr.code, attrp);
84 [ + + ]: 3269564 : get_uleb128 (attr.form, attrp);
85 : :
86 : : /* We can stop if we found the attribute with value zero. */
87 [ + + ]: 3269564 : if (attr.code == 0 && attr.form == 0)
88 : : /* Do not return 0 here - there would be no way to
89 : : distinguish this value from the attribute at offset 0.
90 : : Instead we return +1 which would never be a valid
91 : : offset of an attribute. */
92 : : return 1l;
93 : :
94 : : /* If we are not to OFFSET_ATTRP yet, we just have to skip
95 : : the values of the intervening attributes. */
96 [ + - ]: 2547885 : if (remembered_attrp >= offset_attrp)
97 : : {
98 : : /* Fill in the rest. */
99 : 2547885 : attr.valp = (unsigned char *) die_addr;
100 : 2547885 : attr.cu = die->cu;
101 : :
102 : : /* Now call the callback function. */
103 [ - + ]: 2547885 : if (callback (&attr, arg) != DWARF_CB_OK)
104 : : /* Return the offset of the start of the attribute, so that
105 : : dwarf_getattrs() can be restarted from this point if the
106 : : caller so desires. */
107 : 0 : return remembered_attrp - die->abbrev->attrp;
108 : : }
109 : :
110 : : /* Skip over the rest of this attribute (if there is any). */
111 [ + - ]: 2547885 : if (attr.form != 0)
112 : : {
113 : 2547885 : size_t len = __libdw_form_val_len (dbg, die->cu, attr.form,
114 : : die_addr);
115 : :
116 [ + - ]: 2547885 : if (unlikely (len == (size_t) -1l))
117 : : /* Something wrong with the file. */
118 : : return -1l;
119 : :
120 : : // XXX We need better boundary checks.
121 : 2547885 : die_addr += len;
122 : : }
123 : 3269564 : }
124 : : /* NOTREACHED */
125 : : }
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