1 /*

     2  * Copyright (c) 2017, 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.*;

    26 import java.util.*;

    27 import sun.hotspot.WhiteBox;

    28 

    29 // All strings in archived classes are shared

    30 public class GCStressApp {

    31     static WhiteBox wb = WhiteBox.getWhiteBox();

    32     static int[] arr;

    33 

    34     static String get_shared_string() {

    35         String shared_str = "GCStressApp_shared_string";

    36         return shared_str;

    37     }

    38 

    39     static String get_shared_string1() {

    40         String shared_str1 = "GCStressApp_shared_string1";

    41         return shared_str1;

    42     }

    43 

    44     static void allocAlot() {

    45         try {

    46             Random random = new Random();

    47             for (int i = 0; i < 1024 * 1024; i++) {

    48                 int len = random.nextInt(10000);

    49                 arr = new int[len];

    50             }

    51         } catch (java.lang.OutOfMemoryError e) { }

    52     }

    53 

    54     static void runGC() {

    55         wb.fullGC();

    56     }

    57 

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

    59         if (!wb.isSharedClass(GCStressApp.class)) {

    60            System.out.println("GCStressApp is not shared. Possibly there was a mapping failure.");

    61            return;

    62         }

    63 

    64         if (wb.areSharedStringsIgnored()) {

    65           System.out.println("Shared strings are ignored.");

    66           return;

    67         }

    68 

    69         Object refs = wb.getResolvedReferences(GCStressApp.class);

    70         if (wb.isShared(refs)) {

    71             String shared_str = get_shared_string();

    72             String shared_str1 = get_shared_string1();

    73 

    74             if (!wb.isShared(shared_str)) {

    75                 throw new RuntimeException("FAILED. GCStressApp_shared_string is not shared");

    76             }

    77 

    78             if (!wb.isShared(shared_str1)) {

    79                 throw new RuntimeException("FAILED. GCStressApp_shared_string1 is not shared");

    80             }

    81 

    82             allocAlot();

    83             runGC();

    84             runGC();

    85             runGC();

    86 

    87             System.out.println("Passed");

    88         } else {

    89             System.out.println(

    90                 "No cached resolved references. Open archive heap data is not used.");

    91         }

    92     }

    93 }