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diff --git a/deps/v8/third_party/antlr4/runtime/Cpp/runtime/src/atn/ArrayPredictionContext.h b/deps/v8/third_party/antlr4/runtime/Cpp/runtime/src/atn/ArrayPredictionContext.h
new file mode 100644
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+++ b/deps/v8/third_party/antlr4/runtime/Cpp/runtime/src/atn/ArrayPredictionContext.h
@@ -0,0 +1,45 @@
+
+/* 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 "atn/PredictionContext.h"
+
+namespace antlr4 {
+namespace atn {
+
+class SingletonPredictionContext;
+
+class ANTLR4CPP_PUBLIC ArrayPredictionContext : public PredictionContext {
+ public:
+  /// Parent can be empty only if full ctx mode and we make an array
+  /// from EMPTY and non-empty. We merge EMPTY by using null parent and
+  /// returnState == EMPTY_RETURN_STATE.
+  // Also here: we use a strong reference to our parents to avoid having them
+  // freed prematurely.
+  //            See also SinglePredictionContext.
+  const std::vector<Ref<PredictionContext>> parents;
+
+  /// Sorted for merge, no duplicates; if present, EMPTY_RETURN_STATE is always
+  /// last.
+  const std::vector<size_t> returnStates;
+
+  ArrayPredictionContext(Ref<SingletonPredictionContext> const& a);
+  ArrayPredictionContext(std::vector<Ref<PredictionContext>> const& parents_,
+                         std::vector<size_t> const& returnStates);
+  virtual ~ArrayPredictionContext();
+
+  virtual bool isEmpty() const override;
+  virtual size_t size() const override;
+  virtual Ref<PredictionContext> getParent(size_t index) const override;
+  virtual size_t getReturnState(size_t index) const override;
+  bool operator==(const PredictionContext& o) const override;
+
+  virtual std::string toString() const override;
+};
+
+}  // namespace atn
+}  // namespace antlr4