1 /*-
2 * Copyright (c) 2007 John Birrell (jb@freebsd.org)
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include "_libdwarf.h"
28
29 ELFTC_VCSID("$Id: dwarf_attrval.c 3509 2016-12-29 03:58:41Z emaste $");
30
31 int
dwarf_attrval_flag(Dwarf_Die die,Dwarf_Half attr,Dwarf_Bool * valp,Dwarf_Error * err)32 dwarf_attrval_flag(Dwarf_Die die, Dwarf_Half attr, Dwarf_Bool *valp, Dwarf_Error *err)
33 {
34 Dwarf_Attribute at;
35 Dwarf_Debug dbg;
36
37 dbg = die != NULL ? die->die_dbg : NULL;
38
39 if (die == NULL || valp == NULL) {
40 DWARF_SET_ERROR(dbg, err, DW_DLE_ARGUMENT);
41 return (DW_DLV_ERROR);
42 }
43
44 *valp = 0;
45
46 if ((at = _dwarf_attr_find(die, attr)) == NULL) {
47 DWARF_SET_ERROR(dbg, err, DW_DLE_NO_ENTRY);
48 return (DW_DLV_NO_ENTRY);
49 }
50
51 switch (at->at_form) {
52 case DW_FORM_flag:
53 case DW_FORM_flag_present:
54 *valp = (Dwarf_Bool) (!!at->u[0].u64);
55 break;
56 default:
57 DWARF_SET_ERROR(dbg, err, DW_DLE_ATTR_FORM_BAD);
58 return (DW_DLV_ERROR);
59 }
60
61 return (DW_DLV_OK);
62 }
63
64 int
dwarf_attrval_string(Dwarf_Die die,Dwarf_Half attr,const char ** strp,Dwarf_Error * err)65 dwarf_attrval_string(Dwarf_Die die, Dwarf_Half attr, const char **strp, Dwarf_Error *err)
66 {
67 Dwarf_Attribute at;
68 Dwarf_Debug dbg;
69
70 dbg = die != NULL ? die->die_dbg : NULL;
71
72 if (die == NULL || strp == NULL) {
73 DWARF_SET_ERROR(dbg, err, DW_DLE_ARGUMENT);
74 return (DW_DLV_ERROR);
75 }
76
77 *strp = NULL;
78
79 if ((at = _dwarf_attr_find(die, attr)) == NULL) {
80 DWARF_SET_ERROR(dbg, err, DW_DLE_NO_ENTRY);
81 return (DW_DLV_NO_ENTRY);
82 }
83
84 switch (at->at_form) {
85 case DW_FORM_strp:
86 *strp = at->u[1].s;
87 break;
88 case DW_FORM_string:
89 *strp = at->u[0].s;
90 break;
91 default:
92 DWARF_SET_ERROR(dbg, err, DW_DLE_ATTR_FORM_BAD);
93 return (DW_DLV_ERROR);
94 }
95
96 return (DW_DLV_OK);
97 }
98
99 int
dwarf_attrval_signed(Dwarf_Die die,Dwarf_Half attr,Dwarf_Signed * valp,Dwarf_Error * err)100 dwarf_attrval_signed(Dwarf_Die die, Dwarf_Half attr, Dwarf_Signed *valp, Dwarf_Error *err)
101 {
102 Dwarf_Attribute at;
103 Dwarf_Debug dbg;
104
105 dbg = die != NULL ? die->die_dbg : NULL;
106
107 if (die == NULL || valp == NULL) {
108 DWARF_SET_ERROR(dbg, err, DW_DLE_ARGUMENT);
109 return (DW_DLV_ERROR);
110 }
111
112 *valp = 0;
113
114 if ((at = _dwarf_attr_find(die, attr)) == NULL) {
115 DWARF_SET_ERROR(dbg, err, DW_DLE_NO_ENTRY);
116 return (DW_DLV_NO_ENTRY);
117 }
118
119 switch (at->at_form) {
120 case DW_FORM_data1:
121 *valp = (int8_t) at->u[0].s64;
122 break;
123 case DW_FORM_data2:
124 *valp = (int16_t) at->u[0].s64;
125 break;
126 case DW_FORM_data4:
127 *valp = (int32_t) at->u[0].s64;
128 break;
129 case DW_FORM_data8:
130 case DW_FORM_sdata:
131 *valp = at->u[0].s64;
132 break;
133 default:
134 DWARF_SET_ERROR(dbg, err, DW_DLE_ATTR_FORM_BAD);
135 return (DW_DLV_ERROR);
136 }
137
138 return (DW_DLV_OK);
139 }
140
141 int
dwarf_attrval_unsigned(Dwarf_Die die,Dwarf_Half attr,Dwarf_Unsigned * valp,Dwarf_Error * err)142 dwarf_attrval_unsigned(Dwarf_Die die, Dwarf_Half attr, Dwarf_Unsigned *valp, Dwarf_Error *err)
143 {
144 Dwarf_Attribute at;
145 Dwarf_Die die1;
146 Dwarf_Unsigned val;
147 Dwarf_Debug dbg;
148 int first;
149
150 dbg = die != NULL ? die->die_dbg : NULL;
151
152 if (die == NULL || valp == NULL) {
153 DWARF_SET_ERROR(dbg, err, DW_DLE_ARGUMENT);
154 return (DW_DLV_ERROR);
155 }
156
157 *valp = 0;
158
159 die1 = NULL;
160 for (;;) {
161 if ((at = _dwarf_attr_find(die, attr)) != NULL ||
162 attr != DW_AT_type)
163 break;
164 if ((at = _dwarf_attr_find(die, DW_AT_abstract_origin)) ==
165 NULL &&
166 (at = _dwarf_attr_find(die, DW_AT_specification)) == NULL)
167 break;
168
169 switch (at->at_form) {
170 case DW_FORM_ref1:
171 case DW_FORM_ref2:
172 case DW_FORM_ref4:
173 case DW_FORM_ref8:
174 case DW_FORM_ref_udata:
175 val = at->u[0].u64;
176 first = (die1 == NULL);
177 die1 = _dwarf_die_find(die, val);
178 if (!first)
179 dwarf_dealloc(dbg, die, DW_DLA_DIE);
180 if (die1 == NULL) {
181 DWARF_SET_ERROR(dbg, err, DW_DLE_NO_ENTRY);
182 return (DW_DLV_NO_ENTRY);
183 }
184 die = die1;
185 break;
186 default:
187 DWARF_SET_ERROR(dbg, err, DW_DLE_ATTR_FORM_BAD);
188 return (DW_DLV_ERROR);
189 }
190 }
191
192 if (at == NULL) {
193 DWARF_SET_ERROR(dbg, err, DW_DLE_NO_ENTRY);
194 return (DW_DLV_NO_ENTRY);
195 }
196
197 switch (at->at_form) {
198 case DW_FORM_addr:
199 case DW_FORM_data1:
200 case DW_FORM_data2:
201 case DW_FORM_data4:
202 case DW_FORM_data8:
203 case DW_FORM_udata:
204 case DW_FORM_ref1:
205 case DW_FORM_ref2:
206 case DW_FORM_ref4:
207 case DW_FORM_ref8:
208 case DW_FORM_ref_udata:
209 *valp = at->u[0].u64;
210 break;
211 default:
212 if (die1 != NULL)
213 dwarf_dealloc(dbg, die1, DW_DLA_DIE);
214 DWARF_SET_ERROR(dbg, err, DW_DLE_ATTR_FORM_BAD);
215 return (DW_DLV_ERROR);
216 }
217
218 if (die1 != NULL)
219 dwarf_dealloc(dbg, die1, DW_DLA_DIE);
220
221 return (DW_DLV_OK);
222 }
223