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bpo-23689: re module, fix memory leak when a match is terminated by a signal or memory allocation failure#32223

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ghost wants to merge8 commits intopython:mainfromunknown repository

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@ghostghost commentedApr 1, 2022•
edited by ghost
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@serhiy-storchaka , please review the commits one by one.

MSVC 2022 non-PGO release build, runtest_re.py. It's a bit slower.

(best of 10)Before: 0.278 secAfter:  0.283 sec

But when switching REPEAT very frequently, it has some speed up:

importpyperfsetup= ("import re;""s = 100_000_000 * 'a';""p = r'.*?(?:bb)+';""p = re.compile(p)")stmt="p.match(s)"runner=pyperf.Runner()runner.timeit("match",stmt=stmt,setup=setup)# Before: Mean +- std dev: 1.88 sec +- 0.03 sec# After:  Mean +- std dev: 1.63 sec +- 0.03 sec

https://bugs.python.org/issue23689

@serhiy-storchaka
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My internet connection is very bad last days, so it will take a time for review, sorry.

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It doesn't matter.

@ghostghost closed thisApr 3, 2022
@ghost ghost deleted the repeat_array branchApril 4, 2022 06:11
@abacabadabacabaabacabadabacabamannequin mentioned this pull requestJun 15, 2022
This pull request wasclosed.
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