/**
* Finalizer for instances of FinalizationWitness.
*
* Unless method Forget() has been called, the finalizer displays an error
* message.
*/
void Finalize(JSFreeOp *fop, JSObject *objSelf)
{
nsRefPtr<FinalizationEvent> event = ExtractFinalizationEvent(objSelf);
if (event == nullptr) {
// Forget() has been called
return;
}
// Notify observers. Since we are executed during garbage-collection,
// we need to dispatch the notification to the main thread.
(void)NS_DispatchToMainThread(event);
// We may fail at dispatching to the main thread if we arrive too late
// during shutdown. In that case, there is not much we can do.
}
/**
* JS method |forget()|
*
* === JS documentation
*
* Neutralize the witness. Once this method is called, the witness will
* never report any error.
*/
bool ForgetImpl(JSContext* cx, const JS::CallArgs& args)
{
if (args.length() != 0) {
JS_ReportErrorASCII(cx, "forget() takes no arguments");
return false;
}
JS::Rooted<JS::Value> valSelf(cx, args.thisv());
JS::Rooted<JSObject*> objSelf(cx, &valSelf.toObject());
RefPtr<FinalizationEvent> event = ExtractFinalizationEvent(objSelf);
if (event == nullptr) {
JS_ReportErrorASCII(cx, "forget() called twice");
return false;
}
args.rval().setUndefined();
return true;
}