1 /*
   2  * Copyright (c) 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 Default CDS archive 
  26  * @summary Sharing should be enabled by default on supported platform/binaries.
  27  *          No -Xshare:dump is needed. No -Xshare:auto or -Xshare:on in needed.
  28  *          Verify a set of well-known shared classes.
  29  * @requires vm.cds
  30  * @library /test/lib
  31  * @modules java.base/jdk.internal.misc
  32  *          java.management
  33  * @build sun.hotspot.WhiteBox
  34  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
  35  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  36  *      -XX:+WhiteBoxAPI CheckSharingWithDefaultArchive -showversion
  37  */
  38 import jdk.test.lib.Platform;
  39 import jtreg.SkippedException;
  40 import sun.hotspot.WhiteBox;
  41 
  42 public class CheckSharingWithDefaultArchive {
  43     public static void main(String[] args) throws Exception {
  44         if (!Platform.isDefaultCDSArchiveSupported()) {
  45             throw new SkippedException("Supported platform");
  46         }
  47 
  48         WhiteBox wb = WhiteBox.getWhiteBox();
  49         String classes[] = {"java.lang.Object",
  50                             "java.lang.String",
  51                             "java.lang.Class"};
  52         // If maping fails, sharing is disabled
  53         if (wb.isSharingEnabled()) {
  54             for (int i = 0; i < classes.length; i++) {
  55                 Class c = Class.forName(classes[i]);
  56                 if (wb.isSharedClass(c)) {
  57                     System.out.println(classes[i] + " is shared.");
  58                 } else {
  59                     throw new RuntimeException(classes[i] + " is not shared");
  60                 }
  61             }
  62         } else {
  63            throw new SkippedException("Sharing is not enabled.");
  64         }
  65     }
  66 }