test_peepholer.py 文件源码

def test_elim_jump_after_return2(self):
        # Eliminate dead code: jumps immediately after returns can't be reached
        def f(cond1, cond2):
            while 1:
                if cond1: return 4
        self.assertNotInBytecode(f, 'JUMP_FORWARD')
        # There should be one jump for the while loop.
        returns = [instr for instr in dis.get_instructions(f)
                          if instr.opname == 'JUMP_ABSOLUTE']
        self.assertEqual(len(returns), 1)
        returns = [instr for instr in dis.get_instructions(f)
                          if instr.opname == 'RETURN_VALUE']
        self.assertEqual(len(returns), 2)