8208658: Make CDS archived heap regions usable even if compressed oop encoding has changed
Summary: Relocate and patch archive regions if necessary
Reviewed-by: jiangli, tschatzl
/*
* Copyright (c) 2015, 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.
*
* 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.
*
*/
import java.io.File;
import sun.hotspot.WhiteBox;
public class RewriteBytecodes {
public static void main(String args[]) throws Throwable {
String from = "___xxx___";
String to = "___yyy___";
File clsFile = new File(args[0]);
Class superClass = Util.defineModifiedClass(RewriteBytecodes.class.getClassLoader(), clsFile, from, to);
Child child = new Child();
if (child.getClass().getSuperclass() != superClass) {
throw new RuntimeException("Mismatched super class");
}
// Even if the Super class is not loaded from the CDS archive, make sure the Child class
// can still be loaded successfully, and properly inherits from the rewritten version
// of Super.
if (!child.toString().equals(to)) {
throw new RuntimeException("Wrong output, expected: " + to + ", but got: " + child.toString());
}
WhiteBox wb = WhiteBox.getWhiteBox();
if (wb.isSharedClass(superClass)) {
throw new RuntimeException("wb.isSharedClass(superClass) should be false");
}
if (wb.isSharedClass(child.getClass())) {
throw new RuntimeException("wb.isSharedClass(child.getClass()) should be false");
}
}
}