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[3.14] gh-135228: When @dataclass(slots=True) replaces a dataclass, make the original class collectible (take 2) (GH-137047) (#137666)

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Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Co-authored-by: Alyssa Coghlan <ncoghlan@gmail.com>
Co-authored-by: Petr Viktorin <encukou@gmail.com>
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Miss Islington (bot) 2025-08-12 16:17:26 +02:00 • committed by GitHub
parent daed07a1f9
commit 4dda1768be
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5 changed files with 117 additions and 7 deletions
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42
Python/sysmodule.c
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@ -2640,6 +2640,47 @@ sys__baserepl_impl(PyObject *module)
Py_RETURN_NONE;
}
/*[clinic input]
sys._clear_type_descriptors
type: object(subclass_of='&PyType_Type')
/
Private function for clearing certain descriptors from a type's dictionary.
See gh-135228 for context.
[clinic start generated code]*/
static PyObject *
sys__clear_type_descriptors_impl(PyObject *module, PyObject *type)
/*[clinic end generated code: output=5ad17851b762b6d9 input=dc536c97fde07251]*/
{
PyTypeObject *typeobj = (PyTypeObject *)type;
if (_PyType_HasFeature(typeobj, Py_TPFLAGS_IMMUTABLETYPE)) {
PyErr_SetString(PyExc_TypeError, "argument is immutable");
return NULL;
}
PyObject *dict = _PyType_GetDict(typeobj);
PyObject *dunder_dict = NULL;
if (PyDict_Pop(dict, &_Py_ID(__dict__), &dunder_dict) < 0) {
return NULL;
}
PyObject *dunder_weakref = NULL;
if (PyDict_Pop(dict, &_Py_ID(__weakref__), &dunder_weakref) < 0) {
PyType_Modified(typeobj);
Py_XDECREF(dunder_dict);
return NULL;
}
PyType_Modified(typeobj);
// We try to hold onto a reference to these until after we call
// PyType_Modified(), in case their deallocation triggers somer user code
// that tries to do something to the type.
Py_XDECREF(dunder_dict);
Py_XDECREF(dunder_weakref);
Py_RETURN_NONE;
}
/*[clinic input]
sys._is_gil_enabled -> bool
@ -2836,6 +2877,7 @@ static PyMethodDef sys_methods[] = {
SYS__STATS_DUMP_METHODDEF
#endif
SYS__GET_CPU_COUNT_CONFIG_METHODDEF
SYS__CLEAR_TYPE_DESCRIPTORS_METHODDEF
SYS__IS_GIL_ENABLED_METHODDEF
SYS__DUMP_TRACELETS_METHODDEF
{NULL, NULL} // sentinel