1 /*
   2  * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 /*
  25  * @test TestStringInternCleanup
  26  * @summary Check that Shenandoah cleans up interned strings
  27  * @key gc
  28  *
  29  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  30  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  31  *      -XX:+ShenandoahDegeneratedGC -XX:+ShenandoahVerify
  32  *      TestStringInternCleanup
  33  *
  34  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  35  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  36  *      -XX:-ShenandoahDegeneratedGC -XX:+ShenandoahVerify
  37  *      TestStringInternCleanup
  38  *
  39  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  40  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  41  *      -XX:+ShenandoahDegeneratedGC
  42  *      TestStringInternCleanup
  43  *
  44  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  45  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  46  *      -XX:-ShenandoahDegeneratedGC
  47  *      TestStringInternCleanup
  48  */
  49 
  50 /*
  51  * @test TestStringInternCleanup
  52  * @summary Check that Shenandoah cleans up interned strings
  53  * @key gc
  54  *
  55  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  56  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
  57  *      TestStringInternCleanup
  58  *
  59  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  60  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
  61  *      -XX:+ShenandoahVerify
  62  *      TestStringInternCleanup
  63  *
  64  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  65  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
  66  *      TestStringInternCleanup
  67  *
  68  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  69  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact
  70  *      TestStringInternCleanup
  71  *
  72  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:-ClassUnloadingWithConcurrentMark
  73  *      -XX:+UseShenandoahGC
  74  *      TestStringInternCleanup
  75  */
  76 
  77 /*
  78  * @test TestStringInternCleanup
  79  * @summary Check that Shenandoah cleans up interned strings
  80  * @key gc
  81  *
  82  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  83  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
  84  *      -XX:+ShenandoahVerify
  85  *      TestStringInternCleanup
  86  *
  87  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  88  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu -XX:ShenandoahGCHeuristics=aggressive
  89  *      -XX:+ShenandoahVerify
  90  *      TestStringInternCleanup
  91  *
  92  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  93  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
  94  *      TestStringInternCleanup
  95  */
  96 
  97 public class TestStringInternCleanup {
  98 
  99     static final int COUNT = 1_000_000;
 100     static final int WINDOW = 1_000;
 101 
 102     static final String[] reachable = new String[WINDOW];
 103 
 104     public static void main(String[] args) throws Exception {
 105         int rIdx = 0;
 106         for (int c = 0; c < COUNT; c++) {
 107             reachable[rIdx] = ("LargeInternedString" + c).intern();
 108             rIdx++;
 109             if (rIdx >= WINDOW) {
 110                 rIdx = 0;
 111             }
 112         }
 113     }
 114 
 115 }