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Chris Tate
f87a04fa06
A 'message' listener with a typed parameter received each message as a checked-dynamic value: the port decoded the message into dyn objects, the listener's thunk matched the value against each union arm, read every field again to build the record, and the dyn objects were then released. For bench/channel-messages that was about a third of the delivery time. - A closure registered with on, once, addListener, prependListener or prependOnceListener for 'message' gets a typed message entry when its parameter is a number, boolean, string, a record of those without union fields, or a boxed union of those arms with null or undefined. The entry builds the parameter from the message's nodes and calls the closure. - The entry handles a message only when it has the parameter's exact layout: the union arm the checked conversion picks, and a record's declared keys in declaration order with no others. Any other message runs through the thunk on the decoded value, as before, so undeclared keys, other orders and mismatches behave as they did. - Ports, workers and parentPort deliver a message through the entries when no value in it is reached twice and it holds no ports or native handles. Listeners without an entry share one decoded value, made when the first of them runs. - The message readers are runtime entry points, so the runtime ABI is now 27. Corpus 7130 and 7131 check typed listeners on MessageChannel ports, a worker and parentPort against Node: exact layouts, extra keys, shared values, nested records, untyped listeners beside typed ones, once listeners and a transferred port.