static bool classof(const AbstractOperation* ptr) {
    return ptr->getKind() == kMlir;
  }

 private:
  // Return true is there are still unfilled ODS slots for adding more inputs.
  bool IsNextODSArgAvailable();

  MLIRContext* context_;
  MlirFunctionContext* function_context_;
  SmallVector<Value, 8> operands_;
  llvm::StringMap<Attribute> attrs_;
  std::unique_ptr<OperationState> state_;