Manual Pages  — DWARF_GET_ABBREV_ENTRY

dwarf_get_abbrev_entry – retrieve attribute information from an abbreviation descriptor

LIBRARY SYNOPSIS DESCRIPTION RETURN VALUES EXAMPLES ERRORS SEE ALSO

DWARF Access Library (libdwarf, -ldwarf)

#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);

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.

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));

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.