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diff --git a/deps/v8/third_party/antlr4/runtime/Cpp/runtime/src/atn/LexerAction.h b/deps/v8/third_party/antlr4/runtime/Cpp/runtime/src/atn/LexerAction.h
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+++ b/deps/v8/third_party/antlr4/runtime/Cpp/runtime/src/atn/LexerAction.h
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+/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
+ * Use of this file is governed by the BSD 3-clause license that
+ * can be found in the LICENSE.txt file in the project root.
+ */
+
+#pragma once
+
+#include "antlr4-common.h"
+#include "atn/LexerActionType.h"
+
+namespace antlr4 {
+namespace atn {
+
+/// <summary>
+/// Represents a single action which can be executed following the successful
+/// match of a lexer rule. Lexer actions are used for both embedded action
+/// syntax and ANTLR 4's new lexer command syntax.
+///
+/// @author Sam Harwell
+/// @since 4.2
+/// </summary>
+class ANTLR4CPP_PUBLIC LexerAction {
+ public:
+  virtual ~LexerAction();
+
+  /// <summary>
+  /// Gets the serialization type of the lexer action.
+  /// </summary>
+  /// <returns> The serialization type of the lexer action. </returns>
+  virtual LexerActionType getActionType() const = 0;
+
+  /// <summary>
+  /// Gets whether the lexer action is position-dependent. Position-dependent
+  /// actions may have different semantics depending on the <seealso
+  /// cref="CharStream"/> index at the time the action is executed.
+  ///
+  /// <para>Many lexer commands, including {@code type}, {@code skip}, and
+  /// {@code more}, do not check the input index during their execution.
+  /// Actions like this are position-independent, and may be stored more
+  /// efficiently as part of the <seealso
+  /// cref="LexerATNConfig#lexerActionExecutor"/>.</para>
+  /// </summary>
+  /// <returns> {@code true} if the lexer action semantics can be affected by
+  /// the position of the input <seealso cref="CharStream"/> at the time it is
+  /// executed; otherwise, {@code false}. </returns>
+  virtual bool isPositionDependent() const = 0;
+
+  /// <summary>
+  /// Execute the lexer action in the context of the specified <seealso
+  /// cref="Lexer"/>.
+  ///
+  /// <para>For position-dependent actions, the input stream must already be
+  /// positioned correctly prior to calling this method.</para>
+  /// </summary>
+  /// <param name="lexer"> The lexer instance. </param>
+  virtual void execute(Lexer* lexer) = 0;
+
+  virtual size_t hashCode() const = 0;
+  virtual bool operator==(const LexerAction& obj) const = 0;
+  virtual bool operator!=(const LexerAction& obj) const {
+    return !(*this == obj);
+  }
+
+  virtual std::string toString() const = 0;
+};
+
+}  // namespace atn
+}  // namespace antlr4