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 }