1 /*
   2  * Copyright (c) 2016, 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 8081800 8010319
  27  * @summary Redefine private and default interface methods
  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 -javaagent:redefineagent.jar -Xlog:redefine+class*=trace RedefineInterfaceMethods
  35  */
  36 
  37 // package access top-level class to avoid problem with RedefineClassHelper
  38 // and nested types.
  39 
  40 interface RedefineInterfaceMethods_B {
  41     int ORIGINAL_RETURN = 1;
  42     int NEW_RETURN = 2;
  43     private int privateMethod() {
  44         return ORIGINAL_RETURN;
  45     }
  46     public default int defaultMethod() {
  47         return privateMethod();
  48     }
  49 }
  50 
  51 public class RedefineInterfaceMethods {
  52 
  53     static final int RET = -2;
  54 
  55     public static String redefinedPrivateMethod =
  56         "interface RedefineInterfaceMethods_B {" +
  57         "    int ORIGINAL_RETURN = 1;" +
  58         "    int NEW_RETURN = 2;" +
  59         "    private int privateMethod() {" +
  60         "        return NEW_RETURN;" +
  61         "    }" +
  62         "    public default int defaultMethod() {" +
  63         "       return privateMethod();" +
  64         "    }" +
  65         "}";
  66 
  67     public static String redefinedDefaultMethod =
  68         "interface RedefineInterfaceMethods_B {" +
  69         "    int ORIGINAL_RETURN = 1;" +
  70         "    int NEW_RETURN = 2;" +
  71         "    private int privateMethod() {" +
  72         "        return ORIGINAL_RETURN;" +
  73         "    }" +
  74         "    public default int defaultMethod() {" +
  75         "       return RedefineInterfaceMethods.RET;" +
  76         "    }" +
  77         "}";
  78 
  79     static class Impl implements RedefineInterfaceMethods_B {
  80     }
  81 
  82 
  83     public static void main(String[] args) throws Exception {
  84 
  85         Impl impl = new Impl();
  86 
  87         int res = impl.defaultMethod();
  88         if (res != RedefineInterfaceMethods_B.ORIGINAL_RETURN)
  89             throw new Error("defaultMethod returned " + res +
  90                             " expected " + RedefineInterfaceMethods_B.ORIGINAL_RETURN);
  91 
  92         RedefineClassHelper.redefineClass(RedefineInterfaceMethods_B.class, redefinedPrivateMethod);
  93 
  94         res = impl.defaultMethod();
  95         if (res != RedefineInterfaceMethods_B.NEW_RETURN)
  96             throw new Error("defaultMethod returned " + res +
  97                             " expected " + RedefineInterfaceMethods_B.NEW_RETURN);
  98 
  99         System.gc();
 100 
 101         RedefineClassHelper.redefineClass(RedefineInterfaceMethods_B.class, redefinedDefaultMethod);
 102 
 103         res = impl.defaultMethod();
 104         if (res != RET)
 105             throw new Error("defaultMethod returned " + res +
 106                             " expected " + RET);
 107     }
 108 }