cpython/Lib/test/test_dis.py

460 lines
12 KiB
Python

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