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gh-94673: Add Per-Interpreter tp_weaklist for Static Builtin Types (#95302)

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* Store tp_weaklist on the interpreter state for static builtin types.

* Factor out _PyStaticType_GET_WEAKREFS_LISTPTR().

* Add _PyStaticType_ClearWeakRefs().

* Add a comment about how _PyStaticType_ClearWeakRefs() loops.

* Document the change.

* Update Doc/whatsnew/3.12.rst

* Fix a typo.
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Eric Snow 2022-07-28 19:23:47 -06:00 • committed by GitHub
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Doc/c-api/typeobj.rst
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@ -1942,6 +1942,13 @@ and :c:type:`PyType_Type` effectively act as defaults.)
Weak reference list head, for weak references to this type object. Not
inherited. Internal use only.
.. versionchanged:: 3.12
Internals detail: For the static builtin types this is always ``NULL``,
even if weakrefs are added. Instead, the weakrefs for each are stored
on ``PyInterpreterState``. Use the public C-API or the internal
``_PyObject_GET_WEAKREFS_LISTPTR()`` macro to avoid the distinction.
**Inheritance:**
This field is not inherited.