# 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 POP_JUMP_IF_TRUE 41
6 LOAD_GLOBAL 0 (AssertionError)
9 BUILD_LIST 0
12 LOAD_FAST 0 (x)
15 GET_ITER
>> 16 FOR_ITER 12 (to 31)
19 STORE_FAST 1 (s)
22 LOAD_FAST 1 (s)
25 LIST_APPEND 2
28 JUMP_ABSOLUTE 16
%-4d >> 31 LOAD_CONST 2 (1)
34 BINARY_ADD
35 CALL_FUNCTION 1
38 RAISE_VARARGS 1
%-4d >> 41 LOAD_CONST 0 (None)
44 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.assertIn(dis.opmap["LOAD_CONST"], dis.hasconst)
self.assertIn(dis.opmap["STORE_NAME"], dis.hasname)
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()