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diff --git a/antlr4-cpp-runtime-4.9.2-source/runtime/src/tree/Trees.h b/antlr4-cpp-runtime-4.9.2-source/runtime/src/tree/Trees.h
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+++ b/antlr4-cpp-runtime-4.9.2-source/runtime/src/tree/Trees.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 "tree/TerminalNode.h"
+#include "ParserRuleContext.h"
+#include "Recognizer.h"
+
+namespace antlr4 {
+namespace tree {
+
+  /// A set of utility routines useful for all kinds of ANTLR trees.
+  class ANTLR4CPP_PUBLIC Trees {
+  public:
+    /// Print out a whole tree in LISP form. getNodeText is used on the
+    /// node payloads to get the text for the nodes.  Detect
+    /// parse trees and extract data appropriately.
+    static std::string toStringTree(ParseTree *t, bool pretty = false);
+
+    /// Print out a whole tree in LISP form. getNodeText is used on the
+    ///  node payloads to get the text for the nodes.  Detect
+    ///  parse trees and extract data appropriately.
+    static std::string toStringTree(ParseTree *t, Parser *recog, bool pretty = false);
+
+    /// Print out a whole tree in LISP form. getNodeText is used on the
+    /// node payloads to get the text for the nodes.  Detect
+    /// parse trees and extract data appropriately.
+    static std::string toStringTree(ParseTree *t, const std::vector<std::string> &ruleNames, bool pretty = false);
+    static std::string getNodeText(ParseTree *t, Parser *recog);
+    static std::string getNodeText(ParseTree *t, const std::vector<std::string> &ruleNames);
+
+    /// Return a list of all ancestors of this node.  The first node of
+    ///  list is the root and the last is the parent of this node.
+    static std::vector<ParseTree *> getAncestors(ParseTree *t);
+
+    /** Return true if t is u's parent or a node on path to root from u.
+     *  Use == not equals().
+     *
+     *  @since 4.5.1
+     */
+    static bool isAncestorOf(ParseTree *t, ParseTree *u);
+    static std::vector<ParseTree *> findAllTokenNodes(ParseTree *t, size_t ttype);
+    static std::vector<ParseTree *> findAllRuleNodes(ParseTree *t, size_t ruleIndex);
+    static std::vector<ParseTree *> findAllNodes(ParseTree *t, size_t index, bool findTokens);
+
+    /** Get all descendents; includes t itself.
+     *
+     * @since 4.5.1
+     */
+    static std::vector<ParseTree *> getDescendants(ParseTree *t);
+
+    /** @deprecated */
+    static std::vector<ParseTree *> descendants(ParseTree *t);
+
+    /** Find smallest subtree of t enclosing range startTokenIndex..stopTokenIndex
+     *  inclusively using postorder traversal.  Recursive depth-first-search.
+     *
+     *  @since 4.5.1
+     */
+    static ParserRuleContext* getRootOfSubtreeEnclosingRegion(ParseTree *t,
+                                                              size_t startTokenIndex, // inclusive
+                                                              size_t stopTokenIndex); // inclusive
+
+    /** Return first node satisfying the pred
+     *
+     *  @since 4.5.1
+     */
+    static ParseTree* findNodeSuchThat(ParseTree *t, Ref<misc::Predicate> const& pred);
+
+  private:
+    Trees();
+  };
+
+} // namespace tree
+} // namespace antlr4