llvm-project

64a4895f - [orc-rt] Add SimpleRemoteCA, a SimpleRemote protocol base (#219093)

[orc-rt] Add SimpleRemoteCA, a SimpleRemote protocol base (#219093) SimpleRemoteCA implements the transport-independent parts of the SimpleRemote protocol: opcode and header validation, setup-message encoding, hang-up encoding and decoding, pending-call tracking, and completion of controller calls onto the Session::ControllerAccess contract. Subclasses own wire framing and byte transport entirely -- they de-frame incoming messages and hand the header fields to handleMessage, and build outgoing ones from the Opcode set and the encode helpers. Header validation rejects fields the protocol requires to be unset: a Result may not carry a handler tag, a hang-up may not carry a sequence number or tag. It does not interpret fields the protocol requires to be present -- in particular a Call's handler tag is passed through as given, since the executor's job is to jump where the controller tells it to. A hang-up carries a serialized Error giving the reason the session is ending, matching the format SimpleRemoteEPC and SimpleRemoteEPCServer use, so that an orderly disconnect is distinguishable from a peer that vanished. A hang-up whose reason is a failure ends the session with that reason rather than reporting a plain end-of-session. SimpleRemoteCATest drives the protocol operations directly through a capture-only test double and observes the results via a Session.