1 /*

     2  * Copyright (c) 2017, 2018, 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  * @test

    26  * @bug 8178870 8010319

    27  * @summary Redefine class with CFLH twice to test deleting the cached_class_file

    28  * @library /test/lib

    29  * @modules java.base/jdk.internal.misc

    30  * @modules java.compiler

    31  *          java.instrument

    32  *          jdk.jartool/sun.tools.jar

    33  * @run main RedefineClassHelper

    34  * @run main/othervm/native -Xlog:redefine+class+load+exceptions -agentlib:RedefineDoubleDelete -javaagent:redefineagent.jar RedefineDoubleDelete

    35  */

    36 

    37 // package access top-level class to avoid problem with RedefineClassHelper

    38 // and nested types.

    39 

    40 // The ClassFileLoadHook for this class turns foo into faa and prints out faa.

    41 class RedefineDoubleDelete_B {

    42     int faa() { System.out.println("foo"); return 1; }

    43 }

    44 

    45 public class RedefineDoubleDelete {

    46 

    47     // Class gets a redefinition error because it adds a data member

    48     public static String newB =

    49                 "class RedefineDoubleDelete_B {" +

    50                 "   int count1 = 0;" +

    51                 "}";

    52 

    53     public static String newerB =

    54                 "class RedefineDoubleDelete_B { " +

    55                 "   int faa() { System.out.println(\"baa\"); return 2; }" +

    56                 "}";

    57 

    58     public static void main(String args[]) throws Exception {

    59 

    60         RedefineDoubleDelete_B b = new RedefineDoubleDelete_B();

    61         int val = b.faa();

    62         if (val != 1) {

    63             throw new RuntimeException("return value wrong " + val);

    64         }

    65 

    66         // Redefine B twice to get cached_class_file in both B scratch classes

    67         try {

    68             RedefineClassHelper.redefineClass(RedefineDoubleDelete_B.class, newB);

    69         } catch (java.lang.UnsupportedOperationException e) {

    70             // this is expected

    71         }

    72         try {

    73             RedefineClassHelper.redefineClass(RedefineDoubleDelete_B.class, newB);

    74         } catch (java.lang.UnsupportedOperationException e) {

    75             // this is expected

    76         }

    77 

    78         // Do a full GC.

    79         System.gc();

    80 

    81         // Redefine with a compatible class

    82         RedefineClassHelper.redefineClass(RedefineDoubleDelete_B.class, newerB);

    83         val = b.faa();

    84         if (val != 2) {

    85             throw new RuntimeException("return value wrong " + val);

    86         }

    87 

    88         // Do another full GC to clean things up.

    89         System.gc();

    90     }

    91 }