bpo-44531: Add _PyType_AllocNoTrack() function #26947
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Add an internal _PyType_AllocNoTrack() function to allocate an object without tracking it in the GC. Modify dict_new() to use _PyType_AllocNoTrack(): dict subclasses are now only tracked once all PyDictObject members are initialized. Calling _PyObject_GC_UNTRACK() is no longer needed for the dict type. Similar change in tuple_subtype_new() for tuple subclasses. Replace tuple_gc_track() with _PyObject_GC_TRACK().
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cc @methane @pablogsal: Would you mind to review this change? dict_new() and tuple_subtype_new() detect if a subclass overrides tp_alloc. IMO it's possible and so it's safer to detect it: check |
methane
approved these changes
Jun 29, 2021
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Add an internal _PyType_AllocNoTrack() function to allocate an object
without tracking it in the GC.
Modify dict_new() to use _PyType_AllocNoTrack(): dict subclasses are
now only tracked once all PyDictObject members are initialized.
Calling _PyObject_GC_UNTRACK() is no longer needed for the dict type.
Similar change in tuple_subtype_new() for tuple subclasses.
Replace tuple_gc_track() with _PyObject_GC_TRACK().
https://bugs.python.org/issue44531