dwarf_attrval.c revision 302408 
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
29ELFTC_VCSID("$Id: dwarf_attrval.c 3159 2015-02-15 21:43:27Z emaste $");
30
31int
32dwarf_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
64int
65dwarf_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
99int
100dwarf_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
141int
142dwarf_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
149	dbg = die != NULL ? die->die_dbg : NULL;
150
151	if (die == NULL || valp == NULL) {
152		DWARF_SET_ERROR(dbg, err, DW_DLE_ARGUMENT);
153		return (DW_DLV_ERROR);
154	}
155
156	*valp = 0;
157
158	if ((at = _dwarf_attr_find(die, attr)) == NULL && attr != DW_AT_type) {
159		DWARF_SET_ERROR(dbg, err, DW_DLE_NO_ENTRY);
160		return (DW_DLV_NO_ENTRY);
161	}
162
163	die1 = NULL;
164	if (at == NULL &&
165	    (at = _dwarf_attr_find(die, DW_AT_abstract_origin)) != NULL) {
166		switch (at->at_form) {
167		case DW_FORM_ref1:
168		case DW_FORM_ref2:
169		case DW_FORM_ref4:
170		case DW_FORM_ref8:
171		case DW_FORM_ref_udata:
172			val = at->u[0].u64;
173			if ((die1 = _dwarf_die_find(die, val)) == NULL ||
174			    (at = _dwarf_attr_find(die1, attr)) == NULL) {
175				if (die1 != NULL)
176					dwarf_dealloc(dbg, die1, DW_DLA_DIE);
177				DWARF_SET_ERROR(dbg, err, DW_DLE_NO_ENTRY);
178				return (DW_DLV_NO_ENTRY);
179			}
180			break;
181		default:
182			DWARF_SET_ERROR(dbg, err, DW_DLE_ATTR_FORM_BAD);
183			return (DW_DLV_ERROR);
184		}
185	}
186
187	switch (at->at_form) {
188	case DW_FORM_addr:
189	case DW_FORM_data1:
190	case DW_FORM_data2:
191	case DW_FORM_data4:
192	case DW_FORM_data8:
193	case DW_FORM_udata:
194	case DW_FORM_ref1:
195	case DW_FORM_ref2:
196	case DW_FORM_ref4:
197	case DW_FORM_ref8:
198	case DW_FORM_ref_udata:
199		*valp = at->u[0].u64;
200		break;
201	default:
202		if (die1 != NULL)
203			dwarf_dealloc(dbg, die1, DW_DLA_DIE);
204		DWARF_SET_ERROR(dbg, err, DW_DLE_ATTR_FORM_BAD);
205		return (DW_DLV_ERROR);
206	}
207
208	if (die1 != NULL)
209		dwarf_dealloc(dbg, die1, DW_DLA_DIE);
210
211	return (DW_DLV_OK);
212}
213