'Perform a sanity check on parameters passed in to CFG.__init__().
An AngrCFGError is raised if any parameter fails the sanity check.
:return: None'

def _sanitize_parameters(self):

    if isinstance(self._additional_edges, (list, set, tuple)):
        new_dict = defaultdict(list)
        for (s, d) in self._additional_edges:
            new_dict[s].append(d)
        self._additional_edges = new_dict
    elif isinstance(self._additional_edges, dict):
        pass
    else:
        raise AngrCFGError('Additional    edges    can    only    be    a    list,    set,    tuple,    or    a    dict.')
    if (self._advanced_backward_slicing and self._enable_symbolic_back_traversal):
        raise AngrCFGError('Advanced    backward    slicing    and    symbolic    back    traversal    cannot    both    be    enabled.')
    if (self._advanced_backward_slicing and (not self._keep_state)):
        raise AngrCFGError('Keep    state    must    be    enabled    if    advanced    backward    slicing    is    enabled.')
    self._avoid_runs = ([] if (self._avoid_runs is None) else self._avoid_runs)
    if (not isinstance(self._avoid_runs, (list, set))):
        raise AngrCFGError('"avoid_runs"    must    either    be    None,    or    a    list    or    a    set.')
    self._sanitize_starts()
