static inline absl::string_view StringRefToView(llvm::StringRef ref) {
  return absl::string_view(ref.data(), ref.size());
}

static inline llvm::StringRef StringViewToRef(absl::string_view view) {
  return llvm::StringRef(view.data(), view.size());
}

namespace tensorflow {

OpOrArgNameMapper::~OpOrArgNameMapper() = default;

llvm::StringRef OpOrArgNameMapper::GetUniqueName(llvm::StringRef prefix,

// SavedModel loader attaches the prefix for you during loading.
StringRef MaybeStripAssetDirectoryPrefix(const StringRef filename) {
  if (filename.find("assets/") == 0) {
    return filename.drop_front(7);
  } else {
    return filename;
  }
}

AssetFileDef CreateAssetFileDef(const StringRef filename,
                                const StringRef tensor_name) {
  AssetFileDef asset_file_def{};

namespace mlir {
namespace quant {
namespace {

constexpr StringRef kSharedNameAttr = "shared_name";

class LiftHashTableOpsAsArgsPass
    : public PassWrapper<LiftHashTableOpsAsArgsPass, OperationPass<ModuleOp>> {
 public:
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(LiftHashTableOpsAsArgsPass)
  explicit LiftHashTableOpsAsArgsPass() = default;

  StringRef getArgument() const final {

#include "tensorflow/compiler/mlir/tensorflow/transforms/passes.h"

namespace mlir {
namespace TF {
namespace {

// Location attribute.
constexpr StringRef kClassAttr = "_class";
constexpr StringRef kSharedNameAttr = "shared_name";
constexpr StringRef kLocationPrefix = "loc:@";

#define GEN_PASS_DEF_CONVERTREADONLYREFERENCEVARIABLESTORESOURCEVARIABLESPASS
#include "tensorflow/compiler/mlir/tensorflow/transforms/tf_passes.h.inc"

    // Op type is a NameLoc with the ":" suffix.
    StringRef op_type_with_suffix =
        mlir::cast<NameLoc>(locations.front()).getName().strref();
    StringRef op_type =
        op_type_with_suffix.substr(0, op_type_with_suffix.size() - 1);
    new_unit.set_op_type(op_type.str());

    if (isa<NameLoc>(locations.back())) {
      StringRef name_loc_id =

// associated compilation cluster and replication metadata op.
inline constexpr llvm::StringRef kTpuReplicateAttr = "_tpu_replicate";
// Device types.
inline constexpr llvm::StringRef kTpuDevice = "TPU";
// _xla_outside_compilation
inline constexpr llvm::StringRef kXlaOutsideCompilationAttr =
    "_xla_outside_compilation";
// device attr
inline constexpr llvm::StringRef kDeviceAttr = "device";

  void CountOp(DenseMap<StringRef, llvm::StringMap<int64_t>> &op_count_map,
               StringRef op_name, StringRef dtype);

 private:
  llvm::StringMap<int64_t> op_with_dialect_count_;
  DenseMap<StringRef, llvm::StringMap<int64_t>> op_dtype_count_;
  llvm::StringMap<int64_t> dialect_count_;
  llvm::StringMap<StringRef> dialect_name_of_;
  llvm::StringMap<StringRef> op_name_of_;

  DenseSet<Region*> discovered_;
  // Identifiers about mutable variables.
  // All variables are identified by (device, container, shared_name).
  DenseSet<std::tuple<llvm::StringRef, llvm::StringRef, llvm::StringRef>>
      mutable_variables_;
};

}  // namespace TF
}  // namespace mlir

}

// Returns ID for identifying a resource.
std::tuple<StringRef, StringRef, StringRef> GetResourceKey(Operation* op) {
  StringRef device;
  if (auto attr = op->getAttrOfType<StringAttr>("device")) {
    device = attr.getValue();
  }

  StringRef container;
  if (auto attr = op->getAttrOfType<StringAttr>("container")) {
    container = attr.getValue();
  }

  StringRef shared_name;

inline constexpr StringRef kFusedFunctionAttr = "tf_quant.composite_function";
// The keyword to detect if this is a `NullAttribute`.
inline constexpr StringRef kNullAttributeValue = "N/A";

// Prefixes attached to lifted functions.
constexpr StringRef kQuantizedFuncPrefix = "quantized_";
constexpr StringRef kCompositeFuncPrefix = "composite_";