@Override
	public VarnodeData getRegister(String nm) {
		VarnodeSymbol sym = (VarnodeSymbol) findSymbol(nm);
		if (sym == null) {
			throw new SleighError("Unknown register name '" + nm + "'", null);
		}
		if (sym.getType() != symbol_type.varnode_symbol) {
			throw new SleighError("Symbol is not a register '" + nm + "'", sym.location);
		}
		return sym.getFixedVarnode();
	}
Note: The value of {@link #MAX_UNIQUE_SIZE}  must match the corresponding value
defined by sleighbase.cc
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/pcodeCPort/sleighbase/SleighBase.java