gh-74929: Fix an extra DECREF for PEP 667 implementation #118583
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gvanrossum
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May 5, 2024
Lib/test/test_frame.py
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| self.assertEqual(o, 'a.b.c') | ||
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| def test_update_with_self(self): | ||
| # Make sure reference is not leaking here |
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The problem was not a leak though -- it was a free-after-use (the opposite of a leak, really :-).
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Right. I was imaging a pool of reference and a hole that's leaking the reference without people knowing it so the pool is drained, but yeah leak is not a good word choice here. I just deleted it, the test itself makes sense without any comments.
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Ooh, that's actually a nice image. :-) I will merge now.
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Thanks for the quick review!
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In the PEP 667 implementation, when I copied the code from
_PyFrame_LocalsToFast, I did not realize thevalueis a new reference so it was decrefed in the original code. This resulted in an extra DECREF in__setitem__. Unfortunately I did not catch it because the test cases used were all immortals.Two test cases were added:
f_localsupdating itself multiple times - this will crash the interpreter without the fix