text: /* Copyright 2019 The TensorFlow Authors. All Rights Reserved.
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  ==============================================================================*/
  
  #ifndef TENSORFLOW_COMPILER_MLIR_TENSORFLOW_UTILS_EXPORT_UTILS_H_
  #define TENSORFLOW_COMPILER_MLIR_TENSORFLOW_UTILS_EXPORT_UTILS_H_
  
  #include <functional>
  #include <memory>
  #include <string>
  
  #include "absl/container/flat_hash_set.h"
  #include "llvm/ADT/ArrayRef.h"
  #include "llvm/ADT/StringRef.h"
  #include "mlir/IR/Attributes.h"  // from @llvm-project
  #include "mlir/IR/Location.h"  // from @llvm-project
  #include "mlir/IR/Operation.h"  // from @llvm-project
  #include "mlir/IR/Types.h"  // from @llvm-project
  #include "tensorflow/core/framework/attr_value.pb.h"
  #include "tensorflow/core/framework/function.h"
  #include "tensorflow/core/framework/node_def.pb.h"
  #include "tensorflow/core/framework/node_def_util.h"
  #include "tensorflow/core/lib/core/status.h"
  #include "tensorflow/stream_executor/lib/statusor.h"
  
  namespace mlir {
  class ShapedType;
  }  // namespace mlir
  
  namespace tensorflow {
  
  using stream_executor::port::StatusOr;
  
  // Add custom op prefix for TensorFlow dialects.
  Status AddTensorFlowOpPrefix(std::string);
  
  // Maps an MLIR op name in the TensorFlow dialect or the TensorFlow control
  // dialect back into a TensorFlow valid op name.
  StatusOr<llvm::StringRef> GetTensorFlowOpName(llvm::StringRef);
  
  // Converts an MLIR operation to TensorFlow NodeDef with given node name. This
  // name should be unique to the graph it is being inserted into.
  StatusOr<std::unique_ptr<NodeDef>> GetOperationNodeDef(
      mlir::Operation* inst, llvm::StringRef name);
  
  // Converts MLIR attributes with values to their tensorflow equivalent.
  // "name" and "device" attributes are ignored by default. Use attrs_to_ignore to
  // specify any other attributes that should be ignored.
  Status ConvertAttributes(
      const llvm::ArrayRef<mlir::NamedAttribute> attrs,
      const absl::flat_hash_set<absl::string_view>& attrs_to_ignore,
      bool remove_ref_type, AttrValueMap* values);
  
  // Sets shape attribute with the given name. If the attribute already exists
  // with a different value, returns an error.
  Status SetShapeAttribute(absl::string_view name, mlir::ShapedType shape,
                           AttrValueMap* values);
  
  // Returns true if the given instruction is an mlir::TF::LegacyCallOp or the
  // result of such an operation transformed by the
  // ExecutorToControlDialectConversion pass.
  //
  // TODO(b/145706023): When the ExecutorToControlDialectConversion pass runs
  // before the exporter, it mutates an mlir::TF::LegacyCallOp instruction to
  // an instruction with a different operation name. As such, this routine checks
  // both forms of a LegacyCall instruction. We only need to check for
  // mlir::TF::LegacyCallOp when the ticket is resolved.
  bool IsLegacyCallInstruction(mlir::Operation* inst);
  }  // namespace tensorflow
  #endif  // TENSORFLOW_COMPILER_MLIR_TENSORFLOW_UTILS_EXPORTER_UTILS_H_
  