def __init__(self):
     Visitor.__init__(self)
 def __init__(self):
     Visitor.__init__(self)
     self.var_map = {}
 def __init__(self, registers):
     Visitor.__init__(self)
     self.interference_graph = {}
     self.move_graph = {}
     self.registers = registers
 def __init__(self, color):
     Visitor.__init__(self)
     self.color = color