//
  // Emits an error and returns failure if an error is encountered during
  // conversion. Note that success return value doesn't mean successful
  // legalization.
  mlir::LogicalResult LegalizeOp();

  // Converts the given operand to expression of kind kConstant or kXlaOp.
  // Emits a remark and returns expression of kind kInvalid on failure.
  tensorflow::XlaExpression GetExprForOperand(mlir::Value operand,

                                        PatternRewriter& rewriter,
                                        const std::string& device_type) {
  Tf2XlaRewriter tf2xla_rewriter(op, rewriter, device_type);
  return tf2xla_rewriter.LegalizeOp();
}

Tf2XlaRewriter::Tf2XlaRewriter(Operation* op, PatternRewriter& rewriter,
                               const std::string& device_type)
    : op_(op),
      device_type_(device_type),