@Override
	public String getLabel() {
		validate(lock);
		SymbolTable st = codeMgr.getSymbolTable();
		Symbol symbol = st.getPrimarySymbol(address);
		if (symbol != null) {
			return symbol.getName();
		}
		return null;
	}
@see ghidra.program.model.listing.CodeUnit#addOperandReference(int,
     ghidra.program.model.address.Address,
     ghidra.program.model.symbol.RefType, SourceType)
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/code/CodeUnitDB.java