Method update_heap_wrapper_weak_pointers

gi/object.cpp:2450–2466

* ObjectInstance::update_heap_wrapper_weak_pointers: * * Private callback, called after the JS engine finishes garbage collection, and * notifies when weak pointers need to be either moved or swept. */

 * notifies when weak pointers need to be either moved or swept.
 */
void ObjectInstance::update_heap_wrapper_weak_pointers(JSTracer* trc,
                                                       JS::Compartment*,
                                                       void*) {
    gjs_debug_lifecycle(GJS_DEBUG_GOBJECT, "Weak pointer update callback, "
                        "%zu wrapped GObject(s) to examine",
                        ObjectInstance::num_wrapped_gobjects());

    // Take a lock on the queue till we're done with it, so that we don't
    // risk that another thread will queue something else while sweeping
    auto locked_queue = ToggleQueue::get_default();

    ObjectInstance::remove_wrapped_gobjects_if(
        [&trc](ObjectInstance* instance) -> bool {
            return instance->weak_pointer_was_finalized(trc);
        },
        std::mem_fn(&ObjectInstance::disassociate_js_gobject));
}

bool ObjectInstance::weak_pointer_was_finalized(JSTracer* trc) {
    if (has_wrapper() && !wrapper_is_rooted()) {