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c:\python24\lib \ test \ test_dis.py



0001 from test.test_support import verify, verbose, TestFailed, run_unittest
0002 import sys
0003 import dis
0004 import StringIO
0005 
0006 # Minimal tests for dis module
0007 
0008 import unittest
0009 
0010 def _f(a):
0011     print a
0012     return 1
0013 
0014 dis_f = """\
0015  %-4d         0 LOAD_FAST                0 (a)
0016               3 PRINT_ITEM
0017               4 PRINT_NEWLINE
0018 
0019  %-4d         5 LOAD_CONST               1 (1)
0020               8 RETURN_VALUE
0021 """%(_f.func_code.co_firstlineno + 1,
0022      _f.func_code.co_firstlineno + 2)
0023 
0024 
0025 def bug708901():
0026     for res in range(1,
0027                      10):
0028         pass
0029 
0030 dis_bug708901 = """\
0031  %-4d         0 SETUP_LOOP              23 (to 26)
0032               3 LOAD_GLOBAL              0 (range)
0033               6 LOAD_CONST               1 (1)
0034 
0035  %-4d         9 LOAD_CONST               2 (10)
0036              12 CALL_FUNCTION            2
0037              15 GET_ITER
0038         >>   16 FOR_ITER                 6 (to 25)
0039              19 STORE_FAST               0 (res)
0040 
0041  %-4d        22 JUMP_ABSOLUTE           16
0042         >>   25 POP_BLOCK
0043         >>   26 LOAD_CONST               0 (None)
0044              29 RETURN_VALUE
0045 """%(bug708901.func_code.co_firstlineno + 1,
0046      bug708901.func_code.co_firstlineno + 2,
0047      bug708901.func_code.co_firstlineno + 3)
0048 
0049 class DisTests(unittest.TestCase):
0050     def do_disassembly_test(self, func, expected):
0051         s = StringIO.StringIO()
0052         save_stdout = sys.stdout
0053         sys.stdout = s
0054         dis.dis(func)
0055         sys.stdout = save_stdout
0056         got = s.getvalue()
0057         # Trim trailing blanks (if any).
0058         lines = got.split('\n')
0059         lines = [line.rstrip() for line in lines]
0060         expected = expected.split("\n")
0061         import difflib
0062         if expected != lines:
0063             self.fail(
0064                 "events did not match expectation:\n" +
0065                 "\n".join(difflib.ndiff(expected,
0066                                         lines)))
0067 
0068     def test_opmap(self):
0069         self.assertEqual(dis.opmap["STOP_CODE"], 0)
0070         self.assertEqual(dis.opmap["LOAD_CONST"] in dis.hasconst, True)
0071         self.assertEqual(dis.opmap["STORE_NAME"] in dis.hasname, True)
0072 
0073     def test_opname(self):
0074         self.assertEqual(dis.opname[dis.opmap["LOAD_FAST"]], "LOAD_FAST")
0075 
0076     def test_boundaries(self):
0077         self.assertEqual(dis.opmap["EXTENDED_ARG"], dis.EXTENDED_ARG)
0078         self.assertEqual(dis.opmap["STORE_NAME"], dis.HAVE_ARGUMENT)
0079 
0080     def test_dis(self):
0081         self.do_disassembly_test(_f, dis_f)
0082 
0083     def test_bug_708901(self):
0084         self.do_disassembly_test(bug708901, dis_bug708901)
0085 
0086 def test_main():
0087     run_unittest(DisTests)
0088 
0089 
0090 if __name__ == "__main__":
0091     test_main()
0092 

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