108 lines
3.9 KiB
Java
108 lines
3.9 KiB
Java
/*
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* Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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import sun.hotspot.WhiteBox;
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// package access top-level class to avoid problem with RedefineClassHelper
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// and nested types.
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class RedefineBasic_B {
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public static void okToCallBeforeRedefine() {
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System.out.println("okToCallBeforeRedefine");
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}
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public static void okToCallAfterRedefine() {
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throw new RuntimeException("okToCallAfterRedefine is called before redefinition, test failed");
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}
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}
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public class RedefineBasic {
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public static String newB =
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" class RedefineBasic_B { " +
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" public static void okToCallBeforeRedefine() { " +
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" throw new RuntimeException(\"newB: okToCallBeforeRedefine is " +
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" called after redefinition, test failed\"); }" +
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" public static void okToCallAfterRedefine() { " +
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" System.out.println(\"newB: okToCallAfterRedefine\"); } " +
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" } ";
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static class SubclassOfB extends RedefineBasic_B {
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public static void testAfterRedefine() {
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RedefineBasic_B.okToCallAfterRedefine();
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}
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}
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class Subclass2OfB extends RedefineBasic_B {
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public void testAfterRedefine() {
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super.okToCallAfterRedefine();
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}
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}
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// verify that a given class is shared, report error if necessary
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public static void
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verifyClassIsShared(WhiteBox wb, Class c) throws Exception {
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if (!wb.isSharedClass(c)) {
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throw new RuntimeException(
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"This class should be shared but isn't: " + c.getName());
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} else {
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System.out.println("The class is shared as expected: " +
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c.getName());
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}
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}
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public static void main(String[] args) throws Exception {
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WhiteBox wb = WhiteBox.getWhiteBox();
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verifyClassIsShared(wb, RedefineBasic.class);
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verifyClassIsShared(wb, RedefineBasic_B.class);
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verifyClassIsShared(wb, SubclassOfB.class);
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verifyClassIsShared(wb, Subclass2OfB.class);
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// (1) Test case: verify that original B works as expected
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// and that redefined B is shared and works as expected,
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// with new behavior
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RedefineBasic_B.okToCallBeforeRedefine();
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RedefineClassHelper.redefineClass(RedefineBasic_B.class, newB);
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verifyClassIsShared(wb, RedefineBasic_B.class);
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RedefineBasic_B.okToCallAfterRedefine();
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// Static subclass of the super:
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// 1. Make sure it is still shared
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// 2. and it calls the correct super (the redefined one)
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verifyClassIsShared(wb, SubclassOfB.class);
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SubclassOfB.testAfterRedefine();
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// Same as above, but for non-static class
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verifyClassIsShared(wb, Subclass2OfB.class);
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RedefineBasic thisTest = new RedefineBasic();
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thisTest.testSubclass2OfB();
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}
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public void testSubclass2OfB() {
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Subclass2OfB sub = new Subclass2OfB();
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sub.testAfterRedefine();
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}
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}
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