--- /dev/null	2019-02-07 20:54:51.336000000 +0300
+++ new/test/lib/jdk/test/lib/hprof/model/JavaLazyReadObject.java	2019-02-08 18:34:07.018993903 +0300
@@ -0,0 +1,168 @@
+/*
+ * Copyright (c) 1997, 2017, 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 java.io.IOException;
+import jdk.test.lib.hprof.parser.ReadBuffer;
+
+/*
+ * Base class for lazily read Java heap objects.
+ */
+public abstract class JavaLazyReadObject extends JavaHeapObject {
+
+    // file offset from which this object data starts
+    private final long offset;
+
+    protected JavaLazyReadObject(long offset) {
+        this.offset = offset;
+    }
+
+    @Override
+    public final long getSize() {
+        return getValueLength() + getClazz().getMinimumObjectSize();
+    }
+
+    protected final long getOffset() {
+        return offset;
+    }
+
+    protected ReadBuffer buf() {
+        return getClazz().getReadBuffer();
+    }
+
+    protected int idSize() {
+        return getClazz().getIdentifierSize();
+    }
+
+    // return the length of the data for this object
+    protected final long getValueLength() {
+        try {
+            return readValueLength();
+        } catch (IOException exp) {
+            System.err.println("lazy read failed at offset " + offset);
+            exp.printStackTrace();
+            return 0;
+        }
+    }
+
+    // get this object's content as byte array
+    protected final JavaThing[] getValue() {
+        try {
+            return readValue();
+        } catch (IOException exp) {
+            System.err.println("lazy read failed at offset " + offset);
+            exp.printStackTrace();
+            return Snapshot.EMPTY_JAVATHING_ARRAY;
+        }
+    }
+
+    // get ID of this object
+    public final long getId() {
+        try {
+        if (idSize() == 4) {
+                return ((long)buf().getInt(offset)) & Snapshot.SMALL_ID_MASK;
+            } else {
+                return buf().getLong(offset);
+            }
+        } catch (IOException exp) {
+            System.err.println("lazy read failed at offset " + offset);
+            exp.printStackTrace();
+            return -1;
+        }
+    }
+
+    protected abstract long readValueLength() throws IOException;
+    protected abstract JavaThing[] readValue() throws IOException;
+
+    // make Integer or Long for given object ID
+    protected static Number makeId(long id) {
+        if ((id & ~Snapshot.SMALL_ID_MASK) == 0) {
+            return (int)id;
+        } else {
+            return id;
+        }
+    }
+
+    // get ID as long value from Number
+    protected static long getIdValue(Number num) {
+        long id = num.longValue();
+        if (num instanceof Integer) {
+            id &= Snapshot.SMALL_ID_MASK;
+        }
+        return id;
+    }
+
+    // read object ID from given index from given byte array
+    protected final long objectIdAt(long offset) throws IOException {
+        if (idSize() == 4) {
+            return ((long)intAt(offset)) & Snapshot.SMALL_ID_MASK;
+        } else {
+            return longAt(offset);
+        }
+    }
+
+    // utility methods to read primitive types from byte array
+    protected byte byteAt(long offset) throws IOException {
+        return buf().getByte(offset);
+    }
+
+    protected boolean booleanAt(long offset) throws IOException {
+        return byteAt(offset) == 0 ? false : true;
+    }
+
+    protected char charAt(long offset) throws IOException {
+        return buf().getChar(offset);
+    }
+
+    protected short shortAt(long offset) throws IOException {
+        return buf().getShort(offset);
+    }
+
+    protected int intAt(long offset) throws IOException {
+        return buf().getInt(offset);
+    }
+
+    protected long longAt(long offset) throws IOException {
+        return buf().getLong(offset);
+    }
+
+    protected float floatAt(long offset) throws IOException {
+        int val = intAt(offset);
+        return Float.intBitsToFloat(val);
+    }
+
+    protected double doubleAt(long offset) throws IOException {
+        long val = longAt(offset);
+        return Double.longBitsToDouble(val);
+    }
+}