Function subclasscheck_check_registry

crates/vm/src/stdlib/_abc.rs:287–318

Check if subclass is in registry (recursive)

(
        impl_data: &AbcData,
        subclass: &PyObject,
        vm: &VirtualMachine,
    )

    /// Check if subclass is in registry (recursive)
    fn subclasscheck_check_registry(
        impl_data: &AbcData,
        subclass: &PyObject,
        vm: &VirtualMachine,
    ) -> PyResult<Option<bool>> {
        // Fast path: check if subclass is in weakref directly
        if in_weak_set(&impl_data.registry, subclass, vm)? {
            return Ok(Some(true));
        }

        let registry_opt = impl_data.registry.read();
        let registry = match &*registry_opt {
            Some(s) => s.clone(),
            None => return Ok(None),
        };
        drop(registry_opt);

        // Make a local copy to protect against concurrent modifications
        let registry_copy = PyFrozenSet::from_iter(vm, registry.elements().into_iter())?;

        for weak_ref_obj in registry_copy.elements() {
            if let Ok(weak_ref) = weak_ref_obj.downcast::<PyWeak>()
                && let Some(rkey) = weak_ref.upgrade()
                && subclass.to_owned().is_subclass(&rkey, vm)?
            {
                add_to_weak_set(&impl_data.cache, subclass, vm)?;
                return Ok(Some(true));
            }
        }

        Ok(None)
    }

    /// Internal ABC helper for subclass checks. Should be never used outside abc module.
    #[pyfunction]