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 import java.io.File;

    26 import java.net.URL;

    27 import java.net.URLClassLoader;

    28 import sun.hotspot.WhiteBox;

    29 

    30 //

    31 // Test class mirror objects are cached when open archive heap objects are mapped:

    32 //  - Well-known shared library classes:

    33 //      java.lang.Object

    34 //      java.lang.String

    35 //  - Shared application class loaded by the system class loader

    36 //  - Shared application class loaded user defined class loader

    37 //

    38 public class CheckCachedMirrorApp {

    39     static WhiteBox wb;

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

    41         String path = args[0];

    42         URL url = new File(path).toURI().toURL();

    43         URL[] urls = new URL[] {url};

    44 

    45         URLClassLoader loader = new URLClassLoader(urls);

    46         Class hello = loader.loadClass("Hello");

    47         System.out.println("Loaded " + hello + " from " + url + " using loader " + loader);

    48 

    49         wb = WhiteBox.getWhiteBox();

    50 

    51         if (!wb.areOpenArchiveHeapObjectsMapped()) {

    52             System.out.println("Archived open_archive_heap objects are not mapped.");

    53             System.out.println("This may happen during normal operation. Test Skipped.");

    54             return;

    55         }

    56 

    57         // Well-known shared library classes

    58         Class object_class = Object.class;

    59         checkMirror(object_class, true);

    60         Class string_class = String.class;

    61         checkMirror(string_class, true);

    62 

    63         // Shared app class

    64         Class app_class = CheckCachedMirrorApp.class;

    65         checkMirror(app_class, true);

    66 

    67         // Hello is shared class and loaded by the 'loader' defined in current app.

    68         // It should not have cached resolved_references.

    69         Class class_with_user_defined_loader = hello;

    70         checkMirror(class_with_user_defined_loader, false);

    71     }

    72 

    73     static void checkMirror(Class c, boolean mirrorShouldBeArchived) {

    74         System.out.print("Check cached mirror for " + c);

    75         if (wb.isSharedClass(c)) {

    76             // Check if the Class object is cached

    77             if (mirrorShouldBeArchived && wb.isShared(c)) {

    78                 System.out.println(c + " mirror is cached. Expected.");

    79             } else if (!mirrorShouldBeArchived && !wb.isShared(c)) {

    80                 System.out.println(c + " mirror is not cached. Expected.");

    81             } else if (mirrorShouldBeArchived && !wb.isShared(c)) {

    82                 throw new RuntimeException(

    83                     "FAILED. " + c + " mirror is not cached.");

    84             } else {

    85                 throw new RuntimeException(

    86                     "FAILED. " + c + " mirror should not be cached.");

    87             }

    88         } else {

    89           System.out.println("Class " + c + "is not shared, skipping the check for mirror");

    90         }

    91     }

    92 }