1 /*
2  * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 only, as
7  * published by the Free Software Foundation.
8  *
9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  *
23  */
24 
25 import java.io.File;
26 import java.lang.invoke.MethodHandles;
27 import sun.hotspot.WhiteBox;
28 
29 public class RewriteBytecodes {
main(String args[])30   public static void main(String args[]) throws Throwable {
31     String from = "___xxx___";
32     String to   = "___yyy___";
33     File clsFile = new File(args[0]);
34     Class superClass = Util.defineModifiedClass(MethodHandles.lookup(), clsFile, from, to);
35 
36     Child child = new Child();
37 
38     if (child.getClass().getSuperclass() != superClass) {
39       throw new RuntimeException("Mismatched super class");
40     }
41     // Even if the Super class is not loaded from the CDS archive, make sure the Child class
42     // can still be loaded successfully, and properly inherits from the rewritten version
43     // of Super.
44     if (!child.toString().equals(to)) {
45       throw new RuntimeException("Wrong output, expected: " + to + ", but got: " + child.toString());
46     }
47 
48     WhiteBox wb = WhiteBox.getWhiteBox();
49     if (wb.isSharedClass(superClass)) {
50       throw new RuntimeException("wb.isSharedClass(superClass) should be false");
51     }
52     if (wb.isSharedClass(child.getClass())) {
53       throw new RuntimeException("wb.isSharedClass(child.getClass()) should be false");
54     }
55   }
56 }
57