import stx.gdb.commands
import stx.gdb.objects
import gdb.types

def printer_lookup(val):
    try:
        v = val
        t = val.type.strip_typedefs();
        if (t.code == gdb.TYPE_CODE_PTR):                
            t = t.target()
        else: 
            return None
        if (t.code == gdb.TYPE_CODE_STRUCT):
            name = str(t)
            if (name == 'struct __instance'):
                return stx.gdb.objects.create(val)
    except:
        return None


def printer_register(objfile):
    objfile.pretty_printers.append(printer_lookup)