code: public ConstantFieldInfo addConstantField(String className,
                                                String fieldName, 
                                                TypeDesc type) {
          ConstantInfo ci = new ConstantFieldInfo
              (addConstantClass(className), addConstantNameAndType(fieldName, type));
          return (ConstantFieldInfo)addConstant(ci);
      }
docs: Get or create a constant from the constant pool representing a field in
  any class.