@Override
	public AddressSetView intersectUnknown(AddressSetView guestView) {
		TraceMemoryOperations ops = getMemoryOps(false);
		if (ops == null) {
			return guestView;
		}

		AddressSetView hostView = toOverlay(platform.mapGuestToHost(guestView));
		AddressSetView hostKnown = ops.getAddressesWithState(snap, hostView,
			s -> s != null && s != TraceMemoryState.UNKNOWN);
		AddressSetView hostResult = TraceRegisterUtils.getPhysicalSet(hostView.subtract(hostKnown));
		return platform.mapHostToGuest(hostResult);
	}
@see #toOverlay(Address)
@param set
@return
Ghidra/Debug/Framework-TraceModeling/src/main/java/ghidra/pcode/exec/trace/data/AbstractPcodeTraceDataAccess.java