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458 lines
12 KiB
Python
458 lines
12 KiB
Python
# Minimal tests for dis module
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from test.support import run_unittest, captured_stdout
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import difflib
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import unittest
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import sys
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import dis
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import io
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class _C:
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def __init__(self, x):
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self.x = x == 1
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dis_c_instance_method = """\
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%-4d 0 LOAD_FAST 1 (x)
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3 LOAD_CONST 1 (1)
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6 COMPARE_OP 2 (==)
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9 LOAD_FAST 0 (self)
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12 STORE_ATTR 0 (x)
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15 LOAD_CONST 0 (None)
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18 RETURN_VALUE
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""" % (_C.__init__.__code__.co_firstlineno + 1,)
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dis_c_instance_method_bytes = """\
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0 LOAD_FAST 1 (1)
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3 LOAD_CONST 1 (1)
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6 COMPARE_OP 2 (==)
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9 LOAD_FAST 0 (0)
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12 STORE_ATTR 0 (0)
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15 LOAD_CONST 0 (0)
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18 RETURN_VALUE
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"""
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def _f(a):
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print(a)
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return 1
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dis_f = """\
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%-4d 0 LOAD_GLOBAL 0 (print)
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3 LOAD_FAST 0 (a)
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6 CALL_FUNCTION 1
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9 POP_TOP
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%-4d 10 LOAD_CONST 1 (1)
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13 RETURN_VALUE
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""" % (_f.__code__.co_firstlineno + 1,
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_f.__code__.co_firstlineno + 2)
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dis_f_co_code = """\
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0 LOAD_GLOBAL 0 (0)
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3 LOAD_FAST 0 (0)
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6 CALL_FUNCTION 1
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9 POP_TOP
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10 LOAD_CONST 1 (1)
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13 RETURN_VALUE
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"""
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def bug708901():
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for res in range(1,
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10):
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pass
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dis_bug708901 = """\
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%-4d 0 SETUP_LOOP 23 (to 26)
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3 LOAD_GLOBAL 0 (range)
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6 LOAD_CONST 1 (1)
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%-4d 9 LOAD_CONST 2 (10)
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12 CALL_FUNCTION 2
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15 GET_ITER
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>> 16 FOR_ITER 6 (to 25)
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19 STORE_FAST 0 (res)
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%-4d 22 JUMP_ABSOLUTE 16
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>> 25 POP_BLOCK
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>> 26 LOAD_CONST 0 (None)
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29 RETURN_VALUE
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""" % (bug708901.__code__.co_firstlineno + 1,
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bug708901.__code__.co_firstlineno + 2,
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bug708901.__code__.co_firstlineno + 3)
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def bug1333982(x=[]):
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assert 0, ([s for s in x] +
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1)
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pass
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dis_bug1333982 = """\
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%-4d 0 LOAD_CONST 1 (0)
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3 JUMP_IF_TRUE 33 (to 39)
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6 POP_TOP
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7 LOAD_GLOBAL 0 (AssertionError)
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10 BUILD_LIST 0
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13 LOAD_FAST 0 (x)
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16 GET_ITER
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>> 17 FOR_ITER 12 (to 32)
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20 STORE_FAST 1 (s)
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23 LOAD_FAST 1 (s)
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26 LIST_APPEND 2
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29 JUMP_ABSOLUTE 17
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%-4d >> 32 LOAD_CONST 2 (1)
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35 BINARY_ADD
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36 RAISE_VARARGS 2
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>> 39 POP_TOP
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%-4d 40 LOAD_CONST 0 (None)
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43 RETURN_VALUE
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""" % (bug1333982.__code__.co_firstlineno + 1,
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bug1333982.__code__.co_firstlineno + 2,
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bug1333982.__code__.co_firstlineno + 3)
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_BIG_LINENO_FORMAT = """\
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%3d 0 LOAD_GLOBAL 0 (spam)
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3 POP_TOP
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4 LOAD_CONST 0 (None)
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7 RETURN_VALUE
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"""
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dis_module_expected_results = """\
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Disassembly of f:
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4 0 LOAD_CONST 0 (None)
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3 RETURN_VALUE
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Disassembly of g:
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5 0 LOAD_CONST 0 (None)
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3 RETURN_VALUE
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"""
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expr_str = "x + 1"
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dis_expr_str = """\
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1 0 LOAD_NAME 0 (x)
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3 LOAD_CONST 0 (1)
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6 BINARY_ADD
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7 RETURN_VALUE
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"""
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simple_stmt_str = "x = x + 1"
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dis_simple_stmt_str = """\
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1 0 LOAD_NAME 0 (x)
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3 LOAD_CONST 0 (1)
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6 BINARY_ADD
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7 STORE_NAME 0 (x)
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10 LOAD_CONST 1 (None)
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13 RETURN_VALUE
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"""
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compound_stmt_str = """\
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x = 0
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while 1:
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x += 1"""
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# Trailing newline has been deliberately omitted
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dis_compound_stmt_str = """\
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1 0 LOAD_CONST 0 (0)
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3 STORE_NAME 0 (x)
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2 6 SETUP_LOOP 13 (to 22)
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3 >> 9 LOAD_NAME 0 (x)
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12 LOAD_CONST 1 (1)
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15 INPLACE_ADD
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16 STORE_NAME 0 (x)
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19 JUMP_ABSOLUTE 9
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>> 22 LOAD_CONST 2 (None)
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25 RETURN_VALUE
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"""
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class DisTests(unittest.TestCase):
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def get_disassembly(self, func, lasti=-1, wrapper=True):
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s = io.StringIO()
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save_stdout = sys.stdout
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sys.stdout = s
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try:
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if wrapper:
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dis.dis(func)
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else:
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dis.disassemble(func, lasti)
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finally:
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sys.stdout = save_stdout
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# Trim trailing blanks (if any).
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return [line.rstrip() for line in s.getvalue().splitlines()]
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def get_disassemble_as_string(self, func, lasti=-1):
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return '\n'.join(self.get_disassembly(func, lasti, False))
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def do_disassembly_test(self, func, expected):
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lines = self.get_disassembly(func)
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expected = expected.splitlines()
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if expected != lines:
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self.fail(
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"events did not match expectation:\n" +
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"\n".join(difflib.ndiff(expected,
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lines)))
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def test_opmap(self):
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self.assertEqual(dis.opmap["NOP"], 9)
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self.assertIn(dis.opmap["LOAD_CONST"], dis.hasconst)
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self.assertIn(dis.opmap["STORE_NAME"], dis.hasname)
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def test_opname(self):
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self.assertEqual(dis.opname[dis.opmap["LOAD_FAST"]], "LOAD_FAST")
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def test_boundaries(self):
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self.assertEqual(dis.opmap["EXTENDED_ARG"], dis.EXTENDED_ARG)
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self.assertEqual(dis.opmap["STORE_NAME"], dis.HAVE_ARGUMENT)
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def test_dis(self):
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self.do_disassembly_test(_f, dis_f)
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def test_bug_708901(self):
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self.do_disassembly_test(bug708901, dis_bug708901)
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def test_bug_1333982(self):
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# XXX: re-enable this test!
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# This one is checking bytecodes generated for an `assert` statement,
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# so fails if the tests are run with -O. Skip this test then.
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pass # Test has been disabled due to change in the way
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# list comps are handled. The byte code now includes
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# a memory address and a file location, so they change from
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# run to run.
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# if __debug__:
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# self.do_disassembly_test(bug1333982, dis_bug1333982)
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def test_big_linenos(self):
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def func(count):
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namespace = {}
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func = "def foo():\n " + "".join(["\n "] * count + ["spam\n"])
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exec(func, namespace)
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return namespace['foo']
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# Test all small ranges
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for i in range(1, 300):
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expected = _BIG_LINENO_FORMAT % (i + 2)
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self.do_disassembly_test(func(i), expected)
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# Test some larger ranges too
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for i in range(300, 5000, 10):
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expected = _BIG_LINENO_FORMAT % (i + 2)
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self.do_disassembly_test(func(i), expected)
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def test_big_linenos(self):
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from test import dis_module
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self.do_disassembly_test(dis_module, dis_module_expected_results)
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def test_disassemble_str(self):
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self.do_disassembly_test(expr_str, dis_expr_str)
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self.do_disassembly_test(simple_stmt_str, dis_simple_stmt_str)
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self.do_disassembly_test(compound_stmt_str, dis_compound_stmt_str)
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def test_disassemble_bytes(self):
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self.do_disassembly_test(_f.__code__.co_code, dis_f_co_code)
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def test_disassemble_method(self):
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self.do_disassembly_test(_C(1).__init__, dis_c_instance_method)
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def test_disassemble_method_bytes(self):
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method_bytecode = _C(1).__init__.__code__.co_code
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self.do_disassembly_test(method_bytecode, dis_c_instance_method_bytes)
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def test_dis_none(self):
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try:
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del sys.last_traceback
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except AttributeError:
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pass
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self.assertRaises(RuntimeError, dis.dis, None)
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def test_dis_object(self):
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self.assertRaises(TypeError, dis.dis, object())
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def test_dis_traceback(self):
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try:
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del sys.last_traceback
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except AttributeError:
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pass
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try:
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1/0
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except Exception as e:
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tb = e.__traceback__
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sys.last_traceback = tb
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tb_dis = self.get_disassemble_as_string(tb.tb_frame.f_code, tb.tb_lasti)
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self.do_disassembly_test(None, tb_dis)
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def test_dis_object(self):
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self.assertRaises(TypeError, dis.dis, object())
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code_info_code_info = """\
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Name: code_info
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Filename: (.*)
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Argument count: 1
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Kw-only arguments: 0
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Number of locals: 1
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Stack size: 4
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Flags: OPTIMIZED, NEWLOCALS, NOFREE
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Constants:
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0: %r
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1: '__func__'
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2: '__code__'
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3: '<code_info>'
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4: 'co_code'
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5: "don't know how to disassemble %%s objects"
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%sNames:
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0: hasattr
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1: __func__
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2: __code__
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3: isinstance
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4: str
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5: _try_compile
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6: _format_code_info
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7: TypeError
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8: type
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9: __name__
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Variable names:
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0: x""" % (('Formatted details of methods, functions, or code.', ' 6: None\n')
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if sys.flags.optimize < 2 else (None, ''))
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@staticmethod
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def tricky(x, y, z=True, *args, c, d, e=[], **kwds):
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def f(c=c):
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print(x, y, z, c, d, e, f)
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yield x, y, z, c, d, e, f
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code_info_tricky = """\
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Name: tricky
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Filename: (.*)
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Argument count: 3
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Kw-only arguments: 3
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Number of locals: 8
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Stack size: 7
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Flags: OPTIMIZED, NEWLOCALS, VARARGS, VARKEYWORDS, GENERATOR
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Constants:
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0: None
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1: <code object f at (.*), file "(.*)", line (.*)>
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Variable names:
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0: x
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1: y
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2: z
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3: c
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4: d
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5: e
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6: args
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7: kwds
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Cell variables:
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0: e
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1: d
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2: f
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3: y
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4: x
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5: z"""
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co_tricky_nested_f = tricky.__func__.__code__.co_consts[1]
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code_info_tricky_nested_f = """\
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Name: f
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Filename: (.*)
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Argument count: 1
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Kw-only arguments: 0
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Number of locals: 1
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Stack size: 8
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Flags: OPTIMIZED, NEWLOCALS, NESTED
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Constants:
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0: None
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Names:
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0: print
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Variable names:
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0: c
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Free variables:
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0: e
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1: d
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2: f
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3: y
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4: x
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5: z"""
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code_info_expr_str = """\
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Name: <module>
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Filename: <code_info>
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Argument count: 0
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Kw-only arguments: 0
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Number of locals: 0
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Stack size: 2
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Flags: NOFREE
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Constants:
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0: 1
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Names:
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0: x"""
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code_info_simple_stmt_str = """\
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Name: <module>
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Filename: <code_info>
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Argument count: 0
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Kw-only arguments: 0
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Number of locals: 0
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Stack size: 2
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Flags: NOFREE
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Constants:
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0: 1
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1: None
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Names:
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0: x"""
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code_info_compound_stmt_str = """\
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Name: <module>
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Filename: <code_info>
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Argument count: 0
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Kw-only arguments: 0
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Number of locals: 0
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Stack size: 2
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Flags: NOFREE
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Constants:
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0: 0
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1: 1
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2: None
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Names:
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0: x"""
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class CodeInfoTests(unittest.TestCase):
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test_pairs = [
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(dis.code_info, code_info_code_info),
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(tricky, code_info_tricky),
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(co_tricky_nested_f, code_info_tricky_nested_f),
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(expr_str, code_info_expr_str),
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(simple_stmt_str, code_info_simple_stmt_str),
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(compound_stmt_str, code_info_compound_stmt_str),
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]
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def test_code_info(self):
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self.maxDiff = 1000
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for x, expected in self.test_pairs:
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self.assertRegex(dis.code_info(x), expected)
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def test_show_code(self):
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self.maxDiff = 1000
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for x, expected in self.test_pairs:
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with captured_stdout() as output:
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dis.show_code(x)
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self.assertRegex(output.getvalue(), expected+"\n")
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def test_code_info_object(self):
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self.assertRaises(TypeError, dis.code_info, object())
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def test_pretty_flags_no_flags(self):
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self.assertEqual(dis.pretty_flags(0), '0x0')
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def test_main():
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run_unittest(DisTests, CodeInfoTests)
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if __name__ == "__main__":
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test_main()
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