--- a/mlir/lib/Parser/Token.h	Mon May 25 11:55:54 2020 +0900
+++ b/mlir/lib/Parser/Token.h	Tue Jun 08 06:07:14 2021 +0900
@@ -91,6 +91,15 @@
   /// removing the quote characters and unescaping the contents of the string.
   std::string getStringValue() const;
 
+  /// Given a token containing a hex string literal, return its value or None if
+  /// the token does not contain a valid hex string. A hex string literal is a
+  /// string starting with `0x` and only containing hex digits.
+  Optional<std::string> getHexStringValue() const;
+
+  /// Given a token containing a symbol reference, return the unescaped string
+  /// value.
+  std::string getSymbolReference() const;
+
   // Location processing.
   llvm::SMLoc getLoc() const;
   llvm::SMLoc getEndLoc() const;