code: public ConstantFieldInfo addConstantField(String className,
                                                String fieldName, 
                                                TypeDesc type) {
          return ConstantFieldInfo.make
              (this, 
               ConstantClassInfo.make(this, className),
               ConstantNameAndTypeInfo.make(this, fieldName, type));
      }
docs: Get or create a constant from the constant pool representing a field in
  any class.