| DWARF_GET_ABBREV(3) | Library Functions Manual | DWARF_GET_ABBREV(3) |
dwarf_get_abbrev —
#include <libdwarf.h>
int
dwarf_get_abbrev(Dwarf_Debug
dbg, Dwarf_Unsigned offset,
Dwarf_Abbrev *ret_abbrev,
Dwarf_Unsigned *length, Dwarf_Unsigned
*attr_count, Dwarf_Error *err);
dwarf_get_abbrev() retrieves information about
an abbreviation from the DWARF abbreviations section,
“.debug_abbrev”. Abbreviation information is returned using an
opaque descriptor of type Dwarf_Abbrev. The returned
Dwarf_Abbrev descriptor may then be passed to the other
abbreviation related APIs in the DWARF(3) API to retrieve specific information
about the abbreviation.
Argument dbg should reference a DWARF debug context allocated using dwarf_init(3).
Argument offset should be an offset, relative to the “.debug_abbrev” section, to the start of an abbreviation entry.
Argument ret_abbrev should point to a location that will hold a pointer to the returned Dwarf_Abbrev descriptor.
Argument length should point to a location that will hold the number of bytes used by the abbrevation in the DWARF “.debug_abbrev” section.
Argument attr_count should point to a location that will hold the number of attributes in the abbrevation.
If argument err is not
NULL, it will be used to store error information in
case of an error.
dwarf_dealloc() with the
allocation type DW_DLA_ABBREV to free the memory area
when the Dwarf_Abbrev descriptor is no longer needed.
dwarf_get_abbrev() returns
DW_DLV_OK when it succeeds. It returns
DW_DLV_NO_ENTRY if there is no abbreviation
information at offset offset. In case of an error, it
returns DW_DLV_ERROR and sets the argument
err.
Dwarf_Debug dbg;
Dwarf_Abbrev ab;
Dwarf_Off aboff;
Dwarf_Unsigned length, attr_count;
Dwarf_Half tag;
Dwarf_Error de;
int ret;
while ((ret = dwarf_next_cu_header(dbg, NULL, NULL, &aboff,
NULL, NULL, &de)) == DW_DLV_OK) {
while ((ret = dwarf_get_abbrev(re->dbg, aboff, &ab, &length,
&attr_count, &de)) == DW_DLV_OK) {
if (length == 1) /* Last entry. */
break;
aboff += length;
if (dwarf_get_abbrev_tag(ab, &tag, &de) != DW_DLV_OK) {
warnx("dwarf_get_abbrev_tag failed: %s",
dwarf_errmsg(de));
continue;
}
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));
dwarf_get_abbrev() can fail with:
DW_DLE_ARGUMENT]NULL.DW_DLE_NO_ENTRY]| March 27, 2011 | NetBSD 10.0 |