1/*-
2 * Copyright (c) 2009,2011 Kai Wang
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_abbrev.c 2072 2011-10-27 03:26:49Z jkoshy $");
30
31int
32dwarf_get_abbrev(Dwarf_Debug dbg, Dwarf_Unsigned offset,
33    Dwarf_Abbrev *return_abbrev, Dwarf_Unsigned *length,
34    Dwarf_Unsigned *attr_count, Dwarf_Error *error)
35{
36	Dwarf_Abbrev ab;
37	int ret;
38
39	if (dbg == NULL || return_abbrev == NULL || length == NULL ||
40	    attr_count == NULL) {
41		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
42		return (DW_DLV_ERROR);
43	}
44
45	ret = _dwarf_abbrev_parse(dbg, NULL, &offset, &ab, error);
46	if (ret != DW_DLE_NONE) {
47		if (ret == DW_DLE_NO_ENTRY) {
48			DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
49			return (DW_DLV_NO_ENTRY);
50		} else
51			return (DW_DLV_ERROR);
52	}
53
54	*return_abbrev = ab;
55	*length = ab->ab_length;
56	*attr_count = ab->ab_atnum;
57
58	return (DW_DLV_OK);
59}
60
61int
62dwarf_get_abbrev_tag(Dwarf_Abbrev abbrev, Dwarf_Half *return_tag,
63    Dwarf_Error *error)
64{
65
66	if (abbrev == NULL || return_tag == NULL) {
67		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
68		return (DW_DLV_ERROR);
69	}
70
71	*return_tag = (Dwarf_Half) abbrev->ab_tag;
72
73	return (DW_DLV_OK);
74}
75
76int
77dwarf_get_abbrev_code(Dwarf_Abbrev abbrev, Dwarf_Unsigned *return_code,
78    Dwarf_Error *error)
79{
80
81	if (abbrev == NULL || return_code == NULL) {
82		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
83		return (DW_DLV_ERROR);
84	}
85
86	*return_code = abbrev->ab_entry;
87
88	return (DW_DLV_OK);
89}
90
91int
92dwarf_get_abbrev_children_flag(Dwarf_Abbrev abbrev, Dwarf_Signed *return_flag,
93    Dwarf_Error *error)
94{
95
96	if (abbrev == NULL || return_flag == NULL) {
97		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
98		return (DW_DLV_ERROR);
99	}
100
101	*return_flag = (Dwarf_Signed) abbrev->ab_children;
102
103	return (DW_DLV_OK);
104}
105
106int
107dwarf_get_abbrev_entry(Dwarf_Abbrev abbrev, Dwarf_Signed ndx,
108    Dwarf_Half *attr_num, Dwarf_Signed *form, Dwarf_Off *offset,
109    Dwarf_Error *error)
110{
111	Dwarf_AttrDef ad;
112	int i;
113
114	if (abbrev == NULL || attr_num == NULL || form == NULL ||
115	    offset == NULL) {
116		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
117		return (DW_DLV_ERROR);
118	}
119
120	if (ndx < 0 || (uint64_t) ndx >= abbrev->ab_atnum) {
121		DWARF_SET_ERROR(NULL, error, DW_DLE_NO_ENTRY);
122		return (DW_DLV_NO_ENTRY);
123	}
124
125	ad = STAILQ_FIRST(&abbrev->ab_attrdef);
126	for (i = 0; i < ndx && ad != NULL; i++)
127		ad = STAILQ_NEXT(ad, ad_next);
128
129	assert(ad != NULL);
130
131	*attr_num = ad->ad_attrib;
132	*form = ad->ad_form;
133	*offset = ad->ad_offset;
134
135	return (DW_DLV_OK);
136}
137