return llvm::StringRef();
}

// Returns resource handle value and id for resource op based on attributes. If
// a resource handle is anonymous, a new id is always returned.
ResourceHandleValueAndId GetResourceHandleValueAndIdBase(
    llvm::StringRef container, llvm::StringRef shared_name,
    llvm::StringRef device, Value resource,
    llvm::SmallDenseMap<ResourceHandle, int64_t> &resource_handle_id_map,
    int64_t &next_id) {

  for (const auto &iter : llvm::enumerate(getResults())) {
    auto index = iter.index();
    if (mlir::isa<TF::ResourceType>(
            getElementTypeOrSelf(iter.value().getType()))) {
      resource_vec.push_back(GetResourceHandleValueAndIdBase(
          mlir::cast<mlir::StringAttr>(getContainer()[index]).getValue(),
          mlir::cast<mlir::StringAttr>(getSharedName()[index]).getValue(),

llvm::StringRef GetDeviceOrEmpty(Operation* op);

// Returns resource handle value and id for resource op based on attributes. If
// a resource handle is anonymous, a new id is always returned.
ResourceHandleValueAndId GetResourceHandleValueAndIdBase(
    llvm::StringRef container, llvm::StringRef shared_name,
    llvm::StringRef device, Value resource,
    llvm::SmallDenseMap<ResourceHandle, int64_t>& resource_handle_id_map,
    int64_t& next_id);

SummaryWriterOp::GetResourceHandleValueAndIdList(
    llvm::SmallDenseMap<ResourceHandle, int64_t> &resource_handle_id_map,
    int64_t &next_id) {
  llvm::StringRef device = GetDeviceOrEmpty(getOperation());
  return {GetResourceHandleValueAndIdBase(getContainer(), getSharedName(),
                                          device, getWriter(),
                                          resource_handle_id_map, next_id)};
}