def _GetOpList():
  """Returns list of all defined opcodes.

  Does not eliminate duplicates by C{OP_ID}.

  """
  return [v for v in globals().values()
          if (isinstance(v, type) and issubclass(v, OpCode) and
              hasattr(v, "OP_ID") and v is not OpCode and
              v.OP_ID != 'OP_INSTANCE_MULTI_ALLOC_BASE')]


OP_MAPPING = dict((v.OP_ID, v) for v in _GetOpList())