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DWARF_GET_ABBREV_ENTRY(3)  Library Functions Manual  DWARF_GET_ABBREV_ENTRY(3)

NAME
     dwarf_get_abbrev_entry -- retrieve attribute information from an
     abbreviation descriptor

LIBRARY
     DWARF Access Library (libdwarf, -ldwarf)

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
     Function dwarf_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.

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.

EXAMPLE
     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));

SEE ALSO
     dwarf(3), dwarf_get_abbrev(3)

NetBSD 7.1.2                     April 2, 2011                    NetBSD 7.1.2