@Override
	public ProgramLocation getProgramLocation(int row, int col, ListingField bf) {
		ProxyObj<?> proxy = bf.getProxy();
		if (proxy instanceof VariableProxy) {
			VariableProxy variableProxy = (VariableProxy) proxy;
			Variable sv = variableProxy.getObject();
			return new VariableNameFieldLocation(sv.getProgram(),
				variableProxy.getLocationAddress(), sv, col);
		}

		return null;
	}
@see ghidra.app.util.viewer.field.FieldFactory#getProgramLocation(int, int, ghidra.app.util.viewer.field.ListingField)
Ghidra/Features/Base/src/main/java/ghidra/app/util/viewer/field/VariableNameFieldFactory.java