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GH-94262: Don't create frame objects for frames that aren't complete. #94371

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Merged
markshannon merged 11 commits into from
Jul 1, 2022
Merged

GH-94262: Don't create frame objects for frames that aren't complete. #94371

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87e97ae
Add test for creating frame object when making a generator.
markshannon Jun 27, 2022
583d164
Don't expose incomplete frames as frame objects.
markshannon Jun 27, 2022
5043a8b
Add news
markshannon Jun 28, 2022
e81c1f3
Cleanup after test.
markshannon Jun 28, 2022
6d07165
Explain _PyFrame_IsIncomplete()
markshannon Jun 28, 2022
ce0d4b5
Try harder to break things
markshannon Jun 28, 2022
f56451b
Avoid creating frame objects for incomplete frames vai f_back.
markshannon Jun 28, 2022
b69e803
Fix test
markshannon Jun 28, 2022
c648d46
Assert frame is valid when creating frame object.
markshannon Jun 28, 2022
cf0b32c
Prevent test polluting environment
markshannon Jun 28, 2022
939769c
Create all frames on stack from finalizer.
markshannon Jun 29, 2022
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Try harder to break things
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@markshannon
markshannon committed Jun 28, 2022
commit ce0d4b5b8d2255ab3e1ae2aaa2ec39e672f84d2a
26 changes: 21 additions & 5 deletions Lib/test/test_generators.py
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Original file line number Diff line number Diff line change
Expand Up @@ -172,25 +172,41 @@ def f():

def test_handle_frame_object_in_creation(self):
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markshannon marked this conversation as resolved.

#Attempt to expose partially constructed frames
#See https://github.com/python/cpython/issues/94262

def cb(*args):
try:
sys._getframe(1)
except ValueError:
pass
inspect.stack()

def gen():
yield 1

thresholds = gc.get_threshold()
gc.callbacks.append(cb)
gc.set_threshold(1, 0, 0)

try:
gen()
finally:
gc.set_threshold(*thresholds)
gc.callbacks.pop()

class Sneaky:
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markshannon marked this conversation as resolved.
def __del__(self):
raise KeyboardInterrupt

sneaky = Sneaky()
sneaky._s = Sneaky()
sneaky._s._s = sneaky
del sneaky

gc.set_threshold(1, 0, 0)
try:
gen()
finally:
gc.set_threshold(*thresholds)



class ExceptionTest(unittest.TestCase):
# Tests for the issue #23353: check that the currently handled exception
# is correctly saved/restored in PyEval_EvalFrameEx().
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