--- /dev/null	2019-02-07 20:54:51.336000000 +0300
+++ new/test/lib/jdk/test/lib/hprof/model/Root.java	2019-02-08 18:34:09.002924988 +0300
@@ -0,0 +1,174 @@
+/*
+ * Copyright (c) 1997, 2016, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+
+
+/*
+ * The Original Code is HAT. The Initial Developer of the
+ * Original Code is Bill Foote, with contributions from others
+ * at JavaSoft/Sun.
+ */
+
+package jdk.test.lib.hprof.model;
+
+import jdk.test.lib.hprof.util.Misc;
+
+/**
+ *
+ * @author      Bill Foote
+ */
+
+
+/**
+ * Represents a member of the rootset, that is, one of the objects that
+ * the GC starts from when marking reachable objects.
+ */
+
+public class Root {
+
+    private long id;            // ID of the JavaThing we refer to
+    private long refererId;     // Thread or Class responsible for this, or 0
+    private int index = -1;             // Index in Snapshot.roots
+    private int type;
+    private String description;
+    private JavaHeapObject referer = null;
+    private StackTrace stackTrace = null;
+
+    // Values for type.  Higher values are more interesting -- see getType().
+    // See also getTypeName()
+    public final static int INVALID_TYPE = 0;
+    public final static int UNKNOWN = 1;
+    public final static int SYSTEM_CLASS = 2;
+
+    public final static int NATIVE_LOCAL = 3;
+    public final static int NATIVE_STATIC = 4;
+    public final static int THREAD_BLOCK = 5;
+    public final static int BUSY_MONITOR = 6;
+    public final static int JAVA_LOCAL = 7;
+    public final static int NATIVE_STACK = 8;
+    public final static int JAVA_STATIC = 9;
+
+
+    public Root(long id, long refererId, int type, String description) {
+        this(id, refererId, type, description, null);
+    }
+
+
+    public Root(long id, long refererId, int type, String description,
+                StackTrace stackTrace) {
+        this.id = id;
+        this.refererId = refererId;
+        this.type = type;
+        this.description = description;
+        this.stackTrace = stackTrace;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public String getIdString() {
+        return Misc.toHex(id);
+    }
+
+    public String getDescription() {
+        if ("".equals(description)) {
+            return getTypeName() + " Reference";
+        } else {
+            return description;
+        }
+    }
+
+    /**
+     * Return type.  We guarantee that more interesting roots will have
+     * a type that is numerically higher.
+     */
+    public int getType() {
+        return type;
+    }
+
+    public String getTypeName() {
+        switch(type) {
+            case INVALID_TYPE:          return "Invalid (?!?)";
+            case UNKNOWN:               return "Unknown";
+            case SYSTEM_CLASS:          return "System Class";
+            case NATIVE_LOCAL:          return "JNI Local";
+            case NATIVE_STATIC:         return "JNI Global";
+            case THREAD_BLOCK:          return "Thread Block";
+            case BUSY_MONITOR:          return "Busy Monitor";
+            case JAVA_LOCAL:            return "Java Local";
+            case NATIVE_STACK:          return "Native Stack (possibly Java local)";
+            case JAVA_STATIC:           return "Java Static";
+            default:                    return "??";
+        }
+    }
+
+    /**
+     * Given two Root instances, return the one that is most interesting.
+     */
+    public Root mostInteresting(Root other) {
+        if (other.type > this.type) {
+            return other;
+        } else {
+            return this;
+        }
+    }
+
+    /**
+     * Get the object that's responsible for this root, if there is one.
+     * This will be null, a Thread object, or a Class object.
+     */
+    public JavaHeapObject getReferer() {
+        return referer;
+    }
+
+    /**
+     * @return the stack trace responsible for this root, or null if there
+     * is none.
+     */
+    public StackTrace getStackTrace() {
+        return stackTrace;
+    }
+
+    /**
+     * @return The index of this root in Snapshot.roots
+     */
+    public int getIndex() {
+        return index;
+    }
+
+    void resolve(Snapshot ss) {
+        if (refererId != 0) {
+            referer = ss.findThing(refererId);
+        }
+        if (stackTrace != null) {
+            stackTrace.resolve(ss);
+        }
+    }
+
+    void setIndex(int i) {
+        index = i;
+    }
+
+}