--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/utilities/IntervalNode.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2000, 2003, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+package sun.jvm.hotspot.utilities;
+
+/** Derived from the example in Section 15.3 of CLR. */
+
+import java.util.Comparator;
+
+public class IntervalNode extends RBNode {
+  private Interval   interval;
+  private Comparator endpointComparator;
+  private Object     minEndpoint;
+  private Object     maxEndpoint;
+
+  public IntervalNode(Interval interval, Comparator endpointComparator, Object data) {
+    super(data);
+    this.interval = interval;
+    this.endpointComparator = endpointComparator;
+  }
+
+  public void copyFrom(RBNode arg) {
+    IntervalNode argNode = (IntervalNode) arg;
+    this.interval = argNode.interval;
+  }
+
+  public Interval getInterval() {
+    return interval;
+  }
+
+  public Object getMinEndpoint() {
+    return minEndpoint;
+  }
+
+  public Object getMaxEndpoint() {
+    return maxEndpoint;
+  }
+
+  public boolean update() {
+    Object newMaxEndpoint = computeMaxEndpoint();
+    Object newMinEndpoint = computeMinEndpoint();
+
+    if ((maxEndpoint != newMaxEndpoint) || (minEndpoint != newMinEndpoint)) {
+      maxEndpoint = newMaxEndpoint;
+      minEndpoint = newMinEndpoint;
+      return true;
+    }
+
+    return false;
+  }
+
+  // Computes maximum endpoint without setting it in this node
+  public Object computeMinEndpoint() {
+    IntervalNode left = (IntervalNode) getLeft();
+    if (left != null) {
+      return left.getMinEndpoint();
+    }
+    return interval.getLowEndpoint();
+  }
+
+  // Computes maximum endpoint without setting it in this node
+  public Object computeMaxEndpoint() {
+    Object curMax = interval.getHighEndpoint();
+    if (getLeft() != null) {
+      IntervalNode left = (IntervalNode) getLeft();
+      if (endpointComparator.compare(left.getMaxEndpoint(), curMax) > 0) {
+        curMax = left.getMaxEndpoint();
+      }
+    }
+
+    if (getRight() != null) {
+      IntervalNode right = (IntervalNode) getRight();
+      if (endpointComparator.compare(right.getMaxEndpoint(), curMax) > 0) {
+        curMax = right.getMaxEndpoint();
+      }
+    }
+    return curMax;
+  }
+
+  public String toString() {
+    String res = interval.toString();
+    Object d = getData();
+    if (d != null) {
+      res += " " + d;
+    }
+    return res;
+  }
+}