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bpo-44531: Add _PyType_AllocNoTrack() function (GH-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().
This commit is contained in:
Victor Stinner 2021-07-01 02:30:46 +02:00 • committed by GitHub
parent 1b28187a0e
commit 818628c2da
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4 changed files with 51 additions and 28 deletions
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Include/internal/pycore_object.h
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@ -178,6 +178,8 @@ extern int _Py_CheckSlotResult(
// See also the Py_TPFLAGS_READY flag.
#define _PyType_IsReady(type) ((type)->tp_dict != NULL)
extern PyObject* _PyType_AllocNoTrack(PyTypeObject *type, Py_ssize_t nitems);
#ifdef __cplusplus
}
#endif