@Override
	public DataType getDataType() {
		if (dataType == null) {
			dataType = getDataType(getProgram());
		}
		return dataType;
	}
This gets the ClassHierarchyDescriptor (RTTI 3) structure for the indicated program.
@param program the program which will contain this data type. 
@return the ClassHierarchyDescriptor (RTTI 3) structure.
Ghidra/Features/MicrosoftCodeAnalyzer/src/main/java/ghidra/app/cmd/data/rtti/Rtti3Model.java