1 /* Iterate through the CU units for a given Dwarf.
2 Copyright (C) 2016, 2017 Red Hat, Inc.
3 This file is part of elfutils.
4
5 This file is free software; you can redistribute it and/or modify
6 it under the terms of either
7
8 * the GNU Lesser General Public License as published by the Free
9 Software Foundation; either version 3 of the License, or (at
10 your option) any later version
11
12 or
13
14 * the GNU General Public License as published by the Free
15 Software Foundation; either version 2 of the License, or (at
16 your option) any later version
17
18 or both in parallel, as here.
19
20 elfutils is distributed in the hope that it will be useful, but
21 WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 General Public License for more details.
24
25 You should have received copies of the GNU General Public License and
26 the GNU Lesser General Public License along with this program. If
27 not, see <http://www.gnu.org/licenses/>. */
28
29
30 #ifdef HAVE_CONFIG_H
31 # include <config.h>
32 #endif
33
34 #include <string.h>
35
36 #include "libdwP.h"
37
38 int
dwarf_get_units(Dwarf * dwarf,Dwarf_CU * cu,Dwarf_CU ** next_cu,Dwarf_Half * version,uint8_t * unit_type,Dwarf_Die * cudie,Dwarf_Die * subdie)39 dwarf_get_units (Dwarf *dwarf, Dwarf_CU *cu, Dwarf_CU **next_cu,
40 Dwarf_Half *version, uint8_t *unit_type,
41 Dwarf_Die *cudie, Dwarf_Die *subdie)
42 {
43 /* Handle existing error. */
44 if (dwarf == NULL)
45 return -1;
46
47 Dwarf_Off off;
48 bool v4type;
49 if (cu == NULL)
50 {
51 off = 0;
52 v4type = false;
53 }
54 else
55 {
56 off = cu->end;
57 v4type = cu->sec_idx != IDX_debug_info;
58
59 /* Make sure we got a real (not fake) CU. */
60 if (cu->sec_idx != IDX_debug_info && cu->sec_idx != IDX_debug_types)
61 {
62 __libdw_seterrno (DWARF_E_INVALID_OFFSET);
63 return -1;
64 }
65
66 /* Do we have to switch to the other section, or are we at the end? */
67 if (! v4type)
68 {
69 if (off >= cu->dbg->sectiondata[IDX_debug_info]->d_size)
70 {
71 if (cu->dbg->sectiondata[IDX_debug_types] == NULL)
72 return 1;
73
74 off = 0;
75 v4type = true;
76 }
77 }
78 else
79 if (off >= cu->dbg->sectiondata[IDX_debug_types]->d_size)
80 return 1;
81 }
82
83 *next_cu = __libdw_findcu (dwarf, off, v4type);
84 if (*next_cu == NULL)
85 return -1;
86
87 Dwarf_CU *next = (*next_cu);
88
89 if (version != NULL)
90 *version = next->version;
91
92 if (unit_type != NULL)
93 *unit_type = next->unit_type;
94
95 if (cudie != NULL)
96 {
97 if (next->version >= 2 && next->version <= 5
98 && next->unit_type >= DW_UT_compile
99 && next->unit_type <= DW_UT_split_type)
100 *cudie = CUDIE (next);
101 else
102 memset (cudie, '\0', sizeof (Dwarf_Die));
103 }
104
105 if (subdie != NULL)
106 {
107 if (next->version >= 2 && next->version <= 5)
108 {
109 /* For types, return the actual type DIE. For skeletons,
110 find the associated split compile unit and return its
111 DIE. */
112 if (next->unit_type == DW_UT_type
113 || next->unit_type == DW_UT_split_type)
114 *subdie = SUBDIE(next);
115 else if (next->unit_type == DW_UT_skeleton)
116 {
117 Dwarf_CU *split_cu = __libdw_find_split_unit (next);
118 if (split_cu != NULL)
119 *subdie = CUDIE(split_cu);
120 else
121 memset (subdie, '\0', sizeof (Dwarf_Die));
122 }
123 else
124 memset (subdie, '\0', sizeof (Dwarf_Die));
125 }
126 else
127 memset (subdie, '\0', sizeof (Dwarf_Die));
128 }
129
130 return 0;
131 }
132