// Creates the per-device variables that represent the formatting state of each
// device.
llvm::SmallVector<TF::VarHandleOp, 4> CreateStateVars(
    const llvm::SmallDenseMap<llvm::StringRef, llvm::SmallVector<StringRef, 4>>&
        devices,
    Location loc, RankedTensorType key_type, OpBuilder* builder) {
  llvm::SmallVector<TF::VarHandleOp, 4> state_vars;

  // TODO(b/148913020): Remove this constraint once model parallelism is
  // supported.

                               result);
}

Node* MakeWrite(const Scope& scope, Output value_to_write, const string& id) {
  Output var_handle = ops::VarHandleOp(scope.WithOpName("Var_" + id), DT_FLOAT,
                                       TensorShape({}));
  ops::AssignVariableOp assign_op(scope.WithOpName("Assignee_" + id),

  static const char* kOpsToSkip[] = {
      "IdentityOp",
      "NoOp",              // b/174596063
      "OptionalHasValue",  // b/173136483
      "OptionalGetValue",  // b/173136483
      "VarHandleOp",       // b/176819198
  };
  for (const char* skip : kOpsToSkip) {
    if (absl::StartsWith(orig_op->op_name(), skip)) return absl::OkStatus();
  }

  tf_core_op_expansion_node_counter->GetCell()->IncrementBy(1);

}

// CHECK-LABEL: func @no_set_stateless
func.func @no_set_stateless(%arg: tensor<i32>, %cond: tensor<i1>) -> (tensor<i32>, tensor<i32>) {
  %handle = "tf.VarHandleOp"() { container = "", shared_name = "var" } : () -> tensor<!tf_type.resource<tensor<i32>>>
  "tf.AssignVariableOp"(%handle, %arg) : (tensor<!tf_type.resource<tensor<i32>>>, tensor<i32>) -> ()
  // CHECK: tf.While

  auto& island_block = island_op.getBody().front();
  if (++island_block.begin() != --island_block.end()) return nullptr;

  Operation* resource_op = &island_block.front();
  if (llvm::isa<TF::VarHandleOp, TF::HashTableOp, TF::HashTableV2Op,
                TF::MutableHashTableV2Op>(resource_op)) {
    return resource_op;
  }
  return nullptr;
}

  {
    AbstractTensorHandle* var_ptr = nullptr;
    PartialTensorShape scalar_shape;
    TF_EXPECT_OK(
        PartialTensorShape::MakePartialShape<int32_t>({}, 0, &scalar_shape));
    TF_EXPECT_OK(tensorflow::ops::VarHandleOp(ctx_.get(), &var_ptr, DT_FLOAT,
                                              scalar_shape));
    var.reset(var_ptr);
  }
  // Assign a value.
  auto x = CreateScalarTensor<float, TF_FLOAT>(2.0f);
  TF_EXPECT_OK(

                                          symbol_table);
      ResourceConstructingOps result(global_tensor);
      return result;
    }
  } else if (auto vh = dyn_cast<TF::VarHandleOp>(value.getDefiningOp())) {
    return ResourceConstructingOps(vh);
  } else if (auto it = dyn_cast<TF::IteratorOp>(value.getDefiningOp())) {
    return ResourceConstructingOps(it);
  }
  return ResourceConstructingOps();

// SavedModelBundle complements the imported ModuleOp by providing access to
// `tensorflow::Session` which may be useful when reading values from resources
// (e.g. `TF::VarHandleOp`s).
using ImportedMlirModuleOp =
    std::pair<OwningOpRef<ModuleOp>,
              std::unique_ptr<::tensorflow::SavedModelBundle>>;

// Loads a SavedModel at `saved_model_path` and converts it to `mlir::ModuleOp`.
//

// Test lowering of IfrtLoadVariableOp

// CHECK-LABEL: func @ifrt_load_variable_test
func.func @ifrt_load_variable_test() -> () {
  // CHECK: [[HANDLE:%.*]] = tf_mlrt.executeop()
  // CHECK-SAME:  VarHandleOp
  %0 = "tf.VarHandleOp"() {__op_key = 1: i32, device = "/device:CPU:0", container = "", shared_name = "variable"} : () -> tensor<!tf_type.resource<tensor<1x3xf32>>>
  // CHECK-NEXT: "tf_mlrt.ifrt_load_variable"([[HANDLE]])

// Returns true if 'op' is TF op that accepts resource type, but is
// supported by TFLite.
bool IsSupportedTFLiteResourceOp(Operation* op) {
  return llvm::isa<TF::ReadVariableOp, TF::AssignVariableOp, TF::VarHandleOp,
                   TF::LookupTableFindV2Op, TF::LookupTableImportV2Op,
                   TF::LookupTableSizeV2Op>(op);
}

// Returns true if 'op' is TF/TFLite control flow op that can accept resource