1 /* $NetBSD: dwarf_attrval.c,v 1.3 2015/01/14 09:29:27 martin Exp $ */
2
3 /*-
4 * Copyright (c) 2007 John Birrell (jb@freebsd.org)
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include "_libdwarf.h"
30
31 __RCSID("$NetBSD: dwarf_attrval.c,v 1.3 2015/01/14 09:29:27 martin Exp $");
32 ELFTC_VCSID("Id: dwarf_attrval.c 2072 2011-10-27 03:26:49Z jkoshy ");
33
34 int
dwarf_attrval_flag(Dwarf_Die die,Dwarf_Half attr,Dwarf_Bool * valp,Dwarf_Error * err)35 dwarf_attrval_flag(Dwarf_Die die, Dwarf_Half attr, Dwarf_Bool *valp, Dwarf_Error *err)
36 {
37 Dwarf_Attribute at;
38 Dwarf_Debug dbg;
39
40 dbg = die != NULL ? die->die_dbg : NULL;
41
42 if (die == NULL || valp == NULL) {
43 DWARF_SET_ERROR(dbg, err, DW_DLE_ARGUMENT);
44 return (DW_DLV_ERROR);
45 }
46
47 *valp = 0;
48
49 if ((at = _dwarf_attr_find(die, attr)) == NULL) {
50 DWARF_SET_ERROR(dbg, err, DW_DLE_NO_ENTRY);
51 return (DW_DLV_NO_ENTRY);
52 }
53
54 switch (at->at_form) {
55 case DW_FORM_flag:
56 case DW_FORM_flag_present:
57 *valp = (Dwarf_Bool) (!!at->u[0].u64);
58 break;
59 default:
60 DWARF_SET_ERROR(dbg, err, DW_DLE_ATTR_FORM_BAD);
61 return (DW_DLV_ERROR);
62 }
63
64 return (DW_DLV_OK);
65 }
66
67 int
dwarf_attrval_string(Dwarf_Die die,Dwarf_Half attr,const char ** strp,Dwarf_Error * err)68 dwarf_attrval_string(Dwarf_Die die, Dwarf_Half attr, const char **strp, Dwarf_Error *err)
69 {
70 Dwarf_Attribute at;
71 Dwarf_Debug dbg;
72
73 dbg = die != NULL ? die->die_dbg : NULL;
74
75 if (die == NULL || strp == NULL) {
76 DWARF_SET_ERROR(dbg, err, DW_DLE_ARGUMENT);
77 return (DW_DLV_ERROR);
78 }
79
80 *strp = NULL;
81
82 if ((at = _dwarf_attr_find(die, attr)) == NULL) {
83 DWARF_SET_ERROR(dbg, err, DW_DLE_NO_ENTRY);
84 return (DW_DLV_NO_ENTRY);
85 }
86
87 switch (at->at_form) {
88 case DW_FORM_strp:
89 *strp = at->u[1].s;
90 break;
91 case DW_FORM_string:
92 *strp = at->u[0].s;
93 break;
94 default:
95 DWARF_SET_ERROR(dbg, err, DW_DLE_ATTR_FORM_BAD);
96 return (DW_DLV_ERROR);
97 }
98
99 return (DW_DLV_OK);
100 }
101
102 int
dwarf_attrval_signed(Dwarf_Die die,Dwarf_Half attr,Dwarf_Signed * valp,Dwarf_Error * err)103 dwarf_attrval_signed(Dwarf_Die die, Dwarf_Half attr, Dwarf_Signed *valp, Dwarf_Error *err)
104 {
105 Dwarf_Attribute at;
106 Dwarf_Debug dbg;
107
108 dbg = die != NULL ? die->die_dbg : NULL;
109
110 if (die == NULL || valp == NULL) {
111 DWARF_SET_ERROR(dbg, err, DW_DLE_ARGUMENT);
112 return (DW_DLV_ERROR);
113 }
114
115 *valp = 0;
116
117 if ((at = _dwarf_attr_find(die, attr)) == NULL) {
118 DWARF_SET_ERROR(dbg, err, DW_DLE_NO_ENTRY);
119 return (DW_DLV_NO_ENTRY);
120 }
121
122 switch (at->at_form) {
123 case DW_FORM_data1:
124 *valp = (int8_t) at->u[0].s64;
125 break;
126 case DW_FORM_data2:
127 *valp = (int16_t) at->u[0].s64;
128 break;
129 case DW_FORM_data4:
130 *valp = (int32_t) at->u[0].s64;
131 break;
132 case DW_FORM_data8:
133 case DW_FORM_sdata:
134 *valp = at->u[0].s64;
135 break;
136 default:
137 DWARF_SET_ERROR(dbg, err, DW_DLE_ATTR_FORM_BAD);
138 return (DW_DLV_ERROR);
139 }
140
141 return (DW_DLV_OK);
142 }
143
144 int
dwarf_attrval_unsigned(Dwarf_Die die,Dwarf_Half attr,Dwarf_Unsigned * valp,Dwarf_Error * err)145 dwarf_attrval_unsigned(Dwarf_Die die, Dwarf_Half attr, Dwarf_Unsigned *valp, Dwarf_Error *err)
146 {
147 Dwarf_Attribute at;
148 Dwarf_Die die1;
149 Dwarf_Unsigned val;
150 Dwarf_Debug dbg;
151
152 dbg = die != NULL ? die->die_dbg : NULL;
153
154 if (die == NULL || valp == NULL) {
155 DWARF_SET_ERROR(dbg, err, DW_DLE_ARGUMENT);
156 return (DW_DLV_ERROR);
157 }
158
159 *valp = 0;
160
161 if ((at = _dwarf_attr_find(die, attr)) == NULL && attr != DW_AT_type) {
162 DWARF_SET_ERROR(dbg, err, DW_DLE_NO_ENTRY);
163 return (DW_DLV_NO_ENTRY);
164 }
165
166 die1 = NULL;
167 if (at == NULL &&
168 (at = _dwarf_attr_find(die, DW_AT_abstract_origin)) != NULL) {
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 if ((die1 = _dwarf_die_find(die, val)) == NULL ||
177 (at = _dwarf_attr_find(die1, attr)) == NULL) {
178 if (die1 != NULL)
179 dwarf_dealloc(dbg, die1, DW_DLA_DIE);
180 DWARF_SET_ERROR(dbg, err, DW_DLE_NO_ENTRY);
181 return (DW_DLV_NO_ENTRY);
182 }
183 break;
184 default:
185 DWARF_SET_ERROR(dbg, err, DW_DLE_ATTR_FORM_BAD);
186 return (DW_DLV_ERROR);
187 }
188 }
189
190 switch (at->at_form) {
191 case DW_FORM_addr:
192 case DW_FORM_data1:
193 case DW_FORM_data2:
194 case DW_FORM_data4:
195 case DW_FORM_data8:
196 case DW_FORM_udata:
197 case DW_FORM_ref1:
198 case DW_FORM_ref2:
199 case DW_FORM_ref4:
200 case DW_FORM_ref8:
201 case DW_FORM_ref_udata:
202 *valp = at->u[0].u64;
203 break;
204 default:
205 if (die1 != NULL)
206 dwarf_dealloc(dbg, die1, DW_DLA_DIE);
207 DWARF_SET_ERROR(dbg, err, DW_DLE_ATTR_FORM_BAD);
208 return (DW_DLV_ERROR);
209 }
210
211 if (die1 != NULL)
212 dwarf_dealloc(dbg, die1, DW_DLA_DIE);
213
214 return (DW_DLV_OK);
215 }
216