207 lines
5.7 KiB
Python
207 lines
5.7 KiB
Python
import re
|
|
import types
|
|
import unittest
|
|
import weakref
|
|
|
|
from test import support
|
|
|
|
|
|
class ClearTest(unittest.TestCase):
|
|
"""
|
|
Tests for frame.clear().
|
|
"""
|
|
|
|
def inner(self, x=5, **kwargs):
|
|
1/0
|
|
|
|
def outer(self, **kwargs):
|
|
try:
|
|
self.inner(**kwargs)
|
|
except ZeroDivisionError as e:
|
|
exc = e
|
|
return exc
|
|
|
|
def clear_traceback_frames(self, tb):
|
|
"""
|
|
Clear all frames in a traceback.
|
|
"""
|
|
while tb is not None:
|
|
tb.tb_frame.clear()
|
|
tb = tb.tb_next
|
|
|
|
def test_clear_locals(self):
|
|
class C:
|
|
pass
|
|
c = C()
|
|
wr = weakref.ref(c)
|
|
exc = self.outer(c=c)
|
|
del c
|
|
support.gc_collect()
|
|
# A reference to c is held through the frames
|
|
self.assertIsNot(None, wr())
|
|
self.clear_traceback_frames(exc.__traceback__)
|
|
support.gc_collect()
|
|
# The reference was released by .clear()
|
|
self.assertIs(None, wr())
|
|
|
|
def test_clear_generator(self):
|
|
endly = False
|
|
def g():
|
|
nonlocal endly
|
|
try:
|
|
yield
|
|
self.inner()
|
|
finally:
|
|
endly = True
|
|
gen = g()
|
|
next(gen)
|
|
self.assertFalse(endly)
|
|
# Clearing the frame closes the generator
|
|
gen.gi_frame.clear()
|
|
self.assertTrue(endly)
|
|
|
|
def test_clear_executing(self):
|
|
# Attempting to clear an executing frame is forbidden.
|
|
try:
|
|
1/0
|
|
except ZeroDivisionError as e:
|
|
f = e.__traceback__.tb_frame
|
|
with self.assertRaises(RuntimeError):
|
|
f.clear()
|
|
with self.assertRaises(RuntimeError):
|
|
f.f_back.clear()
|
|
|
|
def test_clear_executing_generator(self):
|
|
# Attempting to clear an executing generator frame is forbidden.
|
|
endly = False
|
|
def g():
|
|
nonlocal endly
|
|
try:
|
|
1/0
|
|
except ZeroDivisionError as e:
|
|
f = e.__traceback__.tb_frame
|
|
with self.assertRaises(RuntimeError):
|
|
f.clear()
|
|
with self.assertRaises(RuntimeError):
|
|
f.f_back.clear()
|
|
yield f
|
|
finally:
|
|
endly = True
|
|
gen = g()
|
|
f = next(gen)
|
|
self.assertFalse(endly)
|
|
# Clearing the frame closes the generator
|
|
f.clear()
|
|
self.assertTrue(endly)
|
|
|
|
@support.cpython_only
|
|
def test_clear_refcycles(self):
|
|
# .clear() doesn't leave any refcycle behind
|
|
with support.disable_gc():
|
|
class C:
|
|
pass
|
|
c = C()
|
|
wr = weakref.ref(c)
|
|
exc = self.outer(c=c)
|
|
del c
|
|
self.assertIsNot(None, wr())
|
|
self.clear_traceback_frames(exc.__traceback__)
|
|
self.assertIs(None, wr())
|
|
|
|
|
|
class FrameAttrsTest(unittest.TestCase):
|
|
|
|
def make_frames(self):
|
|
def outer():
|
|
x = 5
|
|
y = 6
|
|
def inner():
|
|
z = x + 2
|
|
1/0
|
|
t = 9
|
|
return inner()
|
|
try:
|
|
outer()
|
|
except ZeroDivisionError as e:
|
|
tb = e.__traceback__
|
|
frames = []
|
|
while tb:
|
|
frames.append(tb.tb_frame)
|
|
tb = tb.tb_next
|
|
return frames
|
|
|
|
def test_locals(self):
|
|
f, outer, inner = self.make_frames()
|
|
outer_locals = outer.f_locals
|
|
self.assertIsInstance(outer_locals.pop('inner'), types.FunctionType)
|
|
self.assertEqual(outer_locals, {'x': 5, 'y': 6})
|
|
inner_locals = inner.f_locals
|
|
self.assertEqual(inner_locals, {'x': 5, 'z': 7})
|
|
|
|
def test_clear_locals(self):
|
|
# Test f_locals after clear() (issue #21897)
|
|
f, outer, inner = self.make_frames()
|
|
outer.clear()
|
|
inner.clear()
|
|
self.assertEqual(outer.f_locals, {})
|
|
self.assertEqual(inner.f_locals, {})
|
|
|
|
def test_locals_clear_locals(self):
|
|
# Test f_locals before and after clear() (to exercise caching)
|
|
f, outer, inner = self.make_frames()
|
|
outer.f_locals
|
|
inner.f_locals
|
|
outer.clear()
|
|
inner.clear()
|
|
self.assertEqual(outer.f_locals, {})
|
|
self.assertEqual(inner.f_locals, {})
|
|
|
|
def test_f_lineno_del_segfault(self):
|
|
f, _, _ = self.make_frames()
|
|
with self.assertRaises(AttributeError):
|
|
del f.f_lineno
|
|
|
|
|
|
class ReprTest(unittest.TestCase):
|
|
"""
|
|
Tests for repr(frame).
|
|
"""
|
|
|
|
def test_repr(self):
|
|
def outer():
|
|
x = 5
|
|
y = 6
|
|
def inner():
|
|
z = x + 2
|
|
1/0
|
|
t = 9
|
|
return inner()
|
|
|
|
offset = outer.__code__.co_firstlineno
|
|
try:
|
|
outer()
|
|
except ZeroDivisionError as e:
|
|
tb = e.__traceback__
|
|
frames = []
|
|
while tb:
|
|
frames.append(tb.tb_frame)
|
|
tb = tb.tb_next
|
|
else:
|
|
self.fail("should have raised")
|
|
|
|
f_this, f_outer, f_inner = frames
|
|
file_repr = re.escape(repr(__file__))
|
|
self.assertRegex(repr(f_this),
|
|
r"^<frame at 0x[0-9a-fA-F]+, file %s, line %d, code test_repr>$"
|
|
% (file_repr, offset + 23))
|
|
self.assertRegex(repr(f_outer),
|
|
r"^<frame at 0x[0-9a-fA-F]+, file %s, line %d, code outer>$"
|
|
% (file_repr, offset + 7))
|
|
self.assertRegex(repr(f_inner),
|
|
r"^<frame at 0x[0-9a-fA-F]+, file %s, line %d, code inner>$"
|
|
% (file_repr, offset + 5))
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|