NAME
dwarf_get_abbrev_entry —
retrieve attribute information from an
abbreviation descriptor
LIBRARY
library “libdwarf”
SYNOPSIS
#include
<libdwarf.h>
int
dwarf_get_abbrev_entry(Dwarf_Abbrev
abbrev, Dwarf_Signed ndx,
Dwarf_Half *code, Dwarf_Signed
*form, Dwarf_Off *offset,
Dwarf_Error *err);
DESCRIPTION
Functiondwarf_get_abbrev_entry()
retrieves attribute information from a DWARF abbreviation descriptor.
Argument abbrev should be a valid abbreviation descriptor, as returned by function dwarf_get_abbrev(3).
Argument ndx specifies the 0-based index of the attribute. The total count of the attributes contained in the abbreviation entry can be retrieved using the function dwarf_get_abbrev(3).
Argument code should point to a location which will hold a returned attribute code.
Argument form should point to a location which will hold the returned form of the attribute.
Argument offset should point to a location which will hold a returned offset, relative to the “.debug_abbrev” section, for the specified attribute.
If argument err is not NULL, it will be used to return an error descriptor in case of an error.
RETURN VALUES
Function dwarf_get_abbrev_entry() returns
DW_DLV_OK when it succeeds. It returns
DW_DLV_NO_ENTRY if the attribute index specified by
argument ndx is out of range. In case of an error, it
returns DW_DLV_ERROR and sets the argument
err.
EXAMPLES
To loop through all the attribute entries contained in the abbreviation section, use:
Dwarf_Debug dbg;
Dwarf_Abbrev ab;
Dwarf_Off aboff, atoff;
Dwarf_Signed form;
Dwarf_Half attr;
Dwarf_Unsigned length, attr_count;
Dwarf_Error de;
int i, ret;
/* ...allocate 'dbg' using dwarf_init(3) ... */
while ((ret = dwarf_next_cu_header(dbg, NULL, NULL, &aboff,
NULL, NULL, &de)) == DW_DLV_OK) {
while ((ret = dwarf_get_abbrev(dbg, aboff, &ab, &length,
&attr_count, &de)) == DW_DLV_OK) {
if (length == 1) /* Last entry. */
break;
aboff += length;
for (i = 0; (Dwarf_Unsigned) i < attr_count; i++) {
if (dwarf_get_abbrev_entry(ab, i,
&attr, &form, &atoff, &de) != DW_DLV_OK) {
warnx("dwarf_get_abbrev_entry failed:"
" %s", dwarf_errmsg(de));
continue;
}
/* .. use the retrieved information ... */
}
}
if (ret != DW_DLV_OK)
warnx("dwarf_get_abbrev: %s", dwarf_errmsg(de));
}
if (ret == DW_DLV_ERROR)
warnx("dwarf_next_cu_header: %s", dwarf_errmsg(de));
ERRORS
Function dwarf_get_abbrev_entry() can fail
with:
- [
DW_DLE_ARGUMENT] - One of the arguments abbrev, code, form or offset was NULL.
- [
DW_DLE_NO_ENTRY] - The attribute index specified by argument ndx was out of range.