1 .\" Copyright (c) 2011 Kai Wang
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25 .\" $Id: dwarf_get_abbrev.3 2071 2011-10-27 03:20:00Z jkoshy $
29 .Dt DWARF_GET_ABBREV 3
32 .Nd retrieve abbreviation information
40 .Fa "Dwarf_Unsigned offset"
41 .Fa "Dwarf_Abbrev *ret_abbrev"
42 .Fa "Dwarf_Unsigned *length"
43 .Fa "Dwarf_Unsigned *attr_count"
44 .Fa "Dwarf_Error *err"
49 retrieves information about an abbreviation from the DWARF abbreviations
52 Abbreviation information is returned using an opaque descriptor
57 descriptor may then be passed to the other abbreviation related APIs
58 in the DWARF(3) API to retrieve specific information about the
63 should reference a DWARF debug context allocated using
68 should be an offset, relative to the
70 section, to the start of an abbreviation entry.
74 should point to a location that will hold a pointer to the
81 should point to a location that will hold the number of bytes used
82 by the abbrevation in the DWARF
88 should point to a location that will hold the number of
89 attributes in the abbrevation.
93 is not NULL, it will be used to store error information in case of an
96 The memory area used for the
98 descriptor returned in argument
102 Application code should use function
104 with the allocation type
106 to free the memory area when the
108 descriptor is no longer needed.
109 .Ss Application Programming Notes
110 The last abbreviation entry in a standard DWARF abbreviation section
111 will have a special length value of 1.
120 if there is no abbreviation information at offset
122 In case of an error, it returns
124 and sets the argument
130 .Bl -tag -width ".Bq Er DW_DLE_NO_ENTRY"
131 .It Bq Er DW_DLE_ARGUMENT
139 .It Bq Er DW_DLE_NO_ENTRY
140 There is no abbreviation information at offset
144 To loop through all the abbreviation information associated with
145 a DWARF debug context, use:
146 .Bd -literal -offset indent
150 Dwarf_Unsigned length, attr_count;
155 while ((ret = dwarf_next_cu_header(dbg, NULL, NULL, &aboff,
156 NULL, NULL, &de)) == DW_DLV_OK) {
157 while ((ret = dwarf_get_abbrev(re->dbg, aboff, &ab, &length,
158 &attr_count, &de)) == DW_DLV_OK) {
159 if (length == 1) /* Last entry. */
162 if (dwarf_get_abbrev_tag(ab, &tag, &de) != DW_DLV_OK) {
163 warnx("dwarf_get_abbrev_tag failed: %s",
167 if (ret != DW_DLV_OK)
168 warnx("dwarf_get_abbrev: %s", dwarf_errmsg(de));
170 if (ret == DW_DLV_ERROR)
171 warnx("dwarf_next_cu_header: %s", dwarf_errmsg(de));
175 .Xr dwarf_dealloc 3 ,
176 .Xr dwarf_get_abbrev_tag 3 ,
177 .Xr dwarf_get_abbrev_code 3 ,
178 .Xr dwarf_get_abbrev_children_flag 3 ,
179 .Xr dwarf_get_abbrev_entry 3