code: private ClassDescriptor getClassDescriptor(int index) throws InvalidClassFileFormatException {
          @SlashedClassName
          String className = getClassName(index);
          return className != null ? DescriptorFactory.instance().getClassDescriptor(className) : null;
      }
docs: Get the ClassDescriptor of a class referenced in the constant pool.
  
  @param index
  index of the referenced class in the constant pool
  @return the ClassDescriptor of the referenced class
  @throws InvalidClassFileFormatException