def get_derived_from(self, address):
    """Get the target the specified target was derived from.

    If a Target was injected programmatically, e.g. from codegen, this allows us to trace its
    ancestry.  If a Target is not derived, default to returning itself.
    """
    parent_address = self._derived_from_by_derivative_address.get(address, address)
    return self.get_target(parent_address)