GraphDef def;
  {
    mutex_lock l(graph->mu);
    graph->graph.ToGraphDef(&def);
  }
  status->status = MessageToBuffer(def, output_graph_def);
}

void TF_GraphGetOpDef(TF_Graph* graph, const char* op_name,
                      TF_Buffer* output_op_def, TF_Status* status) {
  const OpDef* op_def;
  {
    mutex_lock l(graph->mu);

    mlir::SymbolTable::setSymbolName(func, new_sym_name);
  }

  // Copy all functions used by this signature to the final MLIR module.
  for (auto func : sub_module.getOps<mlir::func::FuncOp>()) {
    absl::MutexLock l(&symbol_table_mu_);
    // The insert here is a NO-OP if the function already exists.
    symbol_table_.insert(func.clone());
  }

  return absl::OkStatus();
}