private void buildFixedComponents() {
		fixedComps = new DataTypeComponent[3];
		fixedComps[0] = new ReadOnlyDataTypeComponent(new DWordDataType(), this, 4, 0,
			SIGNATURE_OFFSET, "signature", null);
		fixedComps[1] = new ReadOnlyDataTypeComponent(new DWordDataType(), this, 4, 1,
			ATTRIBUTES_OFFSET, "attributes", "bit flags");
		fixedComps[2] = new ReadOnlyDataTypeComponent(new DWordDataType(), this, 4, 2,
			RTTI_1_COUNT_OFFSET, "numBaseClasses", "number of base classes (i.e. rtti1Count)");
	}
Creates a dynamic Class Hierarchy Descriptor data type.
@param dtm the data type manager for this data type.
Ghidra/Features/Base/src/main/java/ghidra/app/util/datatype/microsoft/RTTI3DataType.java