# Minimal tests for dis module

from test.test_support import run_unittest

import unittest

import sys

import dis

import StringIO

def _f(a):

    print a

    return 1

dis_f = """\

 %-4d         0 LOAD_FAST                0 (a)

              3 PRINT_ITEM

              4 PRINT_NEWLINE

 %-4d         5 LOAD_CONST               1 (1)

              8 RETURN_VALUE

"""%(_f.func_code.co_firstlineno + 1,

     _f.func_code.co_firstlineno + 2)

def bug708901():

    for res in range(1,

                     10):

        pass

dis_bug708901 = """\

 %-4d         0 SETUP_LOOP              23 (to 26)

              3 LOAD_GLOBAL              0 (range)

              6 LOAD_CONST               1 (1)

 %-4d         9 LOAD_CONST               2 (10)

             12 CALL_FUNCTION            2

             15 GET_ITER

        >>   16 FOR_ITER                 6 (to 25)

             19 STORE_FAST               0 (res)

 %-4d        22 JUMP_ABSOLUTE           16

        >>   25 POP_BLOCK

        >>   26 LOAD_CONST               0 (None)

             29 RETURN_VALUE

"""%(bug708901.func_code.co_firstlineno + 1,

     bug708901.func_code.co_firstlineno + 2,

     bug708901.func_code.co_firstlineno + 3)

def bug1333982(x=[]):

    assert 0, ([s for s in x] +

              1)

    pass

dis_bug1333982 = """\

 %-4d         0 LOAD_CONST               1 (0)

              3 JUMP_IF_TRUE            41 (to 47)

              6 POP_TOP

              7 LOAD_GLOBAL              0 (AssertionError)

             10 BUILD_LIST               0

             13 DUP_TOP

             14 STORE_FAST               1 (_[1])

             17 LOAD_FAST                0 (x)

             20 GET_ITER

        >>   21 FOR_ITER                13 (to 37)

             24 STORE_FAST               2 (s)

             27 LOAD_FAST                1 (_[1])

             30 LOAD_FAST                2 (s)

             33 LIST_APPEND

             34 JUMP_ABSOLUTE           21

        >>   37 DELETE_FAST              1 (_[1])

 %-4d        40 LOAD_CONST               2 (1)

             43 BINARY_ADD

             44 RAISE_VARARGS            2

        >>   47 POP_TOP

 %-4d        48 LOAD_CONST               0 (None)

             51 RETURN_VALUE

"""%(bug1333982.func_code.co_firstlineno + 1,

     bug1333982.func_code.co_firstlineno + 2,

     bug1333982.func_code.co_firstlineno + 3)

_BIG_LINENO_FORMAT = """\

%3d           0 LOAD_GLOBAL              0 (spam)

              3 POP_TOP

              4 LOAD_CONST               0 (None)

              7 RETURN_VALUE

"""

class DisTests(unittest.TestCase):

    def do_disassembly_test(self, func, expected):

        s = StringIO.StringIO()

        save_stdout = sys.stdout

        sys.stdout = s

        dis.dis(func)

        sys.stdout = save_stdout

        got = s.getvalue()

        # Trim trailing blanks (if any).

        lines = got.split('\n')

        lines = [line.rstrip() for line in lines]

        expected = expected.split("\n")

        import difflib

        if expected != lines:

            self.fail(

                "events did not match expectation:\n" +

                "\n".join(difflib.ndiff(expected,

                                        lines)))

    def test_opmap(self):

        self.assertEqual(dis.opmap["STOP_CODE"], 0)

        self.assertEqual(dis.opmap["LOAD_CONST"] in dis.hasconst, True)

        self.assertEqual(dis.opmap["STORE_NAME"] in dis.hasname, True)

    def test_opname(self):

        self.assertEqual(dis.opname[dis.opmap["LOAD_FAST"]], "LOAD_FAST")

    def test_boundaries(self):

        self.assertEqual(dis.opmap["EXTENDED_ARG"], dis.EXTENDED_ARG)

        self.assertEqual(dis.opmap["STORE_NAME"], dis.HAVE_ARGUMENT)

    def test_dis(self):

        self.do_disassembly_test(_f, dis_f)

    def test_bug_708901(self):

        self.do_disassembly_test(bug708901, dis_bug708901)

    def test_bug_1333982(self):

        # This one is checking bytecodes generated for an `assert` statement,

        # so fails if the tests are run with -O.  Skip this test then.

        if __debug__:

            self.do_disassembly_test(bug1333982, dis_bug1333982)

    def test_big_linenos(self):

        def func(count):

            namespace = {}

            func = "def foo():\n " + "".join(["\n "] * count + ["spam\n"])

            exec func in namespace

            return namespace['foo']

        # Test all small ranges

        for i in xrange(1, 300):

            expected = _BIG_LINENO_FORMAT % (i + 2)

            self.do_disassembly_test(func(i), expected)

        # Test some larger ranges too

        for i in xrange(300, 5000, 10):

            expected = _BIG_LINENO_FORMAT % (i + 2)

            self.do_disassembly_test(func(i), expected)

def test_main():

    run_unittest(DisTests)

if __name__ == "__main__":

    test_main()