class BasicBlock:
   # Uninterrupted sequence of instructions.
   def __init__(self, name):
      self.name = name
      self.instructions = []
   def __repr__(self):
      return 'BB {0}'.format(self.name)
   def addIns(self, i):
      self.instructions.append(i)
   def getInstructions(self):
      return self.instructions
   Instructions = property(getInstructions)
   def getLastIns(self):
      return self.instructions[-1]
   LastIns = property(getLastIns)
   @property
   def Empty(self):
      return len(self.instructions) == 0
   @property
   def FirstIns(self):
      return self.instructions[0]