protected T badOp(PcodeOp op) {
		switch (op.getOpcode()) {
			case PcodeOp.UNIMPLEMENTED:
				throw new LowlevelError(
					"Encountered an unimplemented instruction at " +
						op.getSeqnum().getTarget());
			default:
				throw new LowlevelError(
					"Unsupported p-code op at " + op.getSeqnum().getTarget() + ": " + op);
		}
	}
The method invoked when an unrecognized or unsupported operator is encountered

@param op the op
@return the value, but this usually throws an exception
Ghidra/Debug/ProposedUtils/src/main/java/ghidra/pcode/eval/AbstractVarnodeEvaluator.java