31     self->wr_callback = callback;  in init_weakref()
56     PyObject *callback = self->wr_callback;  in clear_weakref()
76         self->wr_callback = NULL;  in clear_weakref()
99     callback = self->wr_callback;  in _PyWeakref_ClearRef()
100     self->wr_callback = NULL;  in _PyWeakref_ClearRef()
102     self->wr_callback = callback;  in _PyWeakref_ClearRef()
117     Py_VISIT(self->wr_callback);  in gc_traverse()
241     if (head != NULL && head->wr_callback == NULL) {  in get_basic_refs()
250             && head->wr_callback == NULL  in get_basic_refs()
361     {"__callback__", T_OBJECT, offsetof(PyWeakReference, wr_callback), READONLY},
583     if (self->wr_callback != NULL)  in proxy_dealloc()
980     if (*list != NULL && (*list)->wr_callback == NULL) {  in PyObject_ClearWeakRefs()
982         if (*list != NULL && (*list)->wr_callback == NULL)  in PyObject_ClearWeakRefs()
992             PyObject *callback = current->wr_callback;  in PyObject_ClearWeakRefs()
994             current->wr_callback = NULL;  in PyObject_ClearWeakRefs()
1019                     PyTuple_SET_ITEM(tuple, i * 2 + 1, current->wr_callback);  in PyObject_ClearWeakRefs()
1022                     Py_DECREF(current->wr_callback);  in PyObject_ClearWeakRefs()
1024                 current->wr_callback = NULL;  in PyObject_ClearWeakRefs()