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  * @requires vm.gc.Shenandoah & !vm.graal.enabled
  29  *
  30  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  31  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  32  *      -XX:+ShenandoahDegeneratedGC -XX:+ShenandoahVerify
  33  *      TestStringInternCleanup
  34  *
  35  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  36  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  37  *      -XX:-ShenandoahDegeneratedGC -XX:+ShenandoahVerify
  38  *      TestStringInternCleanup
  39  *
  40  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  41  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  42  *      -XX:+ShenandoahDegeneratedGC
  43  *      TestStringInternCleanup
  44  *
  45  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  46  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  47  *      -XX:-ShenandoahDegeneratedGC
  48  *      TestStringInternCleanup
  49  */
  50 
  51 /*
  52  * @test TestStringInternCleanup
  53  * @summary Check that Shenandoah cleans up interned strings
  54  * @key gc
  55  * @requires vm.gc.Shenandoah & !vm.graal.enabled
  56  *
  57  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  58  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
  59  *      TestStringInternCleanup
  60  *
  61  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  62  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
  63  *      -XX:+ShenandoahVerify
  64  *      TestStringInternCleanup
  65  *
  66  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  67  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
  68  *      TestStringInternCleanup
  69  *
  70  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  71  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact
  72  *      TestStringInternCleanup
  73  *
  74  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:-ClassUnloadingWithConcurrentMark
  75  *      -XX:+UseShenandoahGC
  76  *      TestStringInternCleanup
  77  */
  78 
  79 /*
  80  * @test TestStringInternCleanup
  81  * @summary Check that Shenandoah cleans up interned strings
  82  * @key gc
  83  * @requires vm.gc.Shenandoah & !vm.graal.enabled
  84  *
  85  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  86  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
  87  *      -XX:+ShenandoahVerify
  88  *      TestStringInternCleanup
  89  *
  90  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  91  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu -XX:ShenandoahGCHeuristics=aggressive
  92  *      -XX:+ShenandoahVerify
  93  *      TestStringInternCleanup
  94  *
  95  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  96  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
  97  *      TestStringInternCleanup
  98  */
  99 
 100 public class TestStringInternCleanup {
 101 
 102     static final int COUNT = 1_000_000;
 103     static final int WINDOW = 1_000;
 104 
 105     static final String[] reachable = new String[WINDOW];
 106 
 107     public static void main(String[] args) throws Exception {
 108         int rIdx = 0;
 109         for (int c = 0; c < COUNT; c++) {
 110             reachable[rIdx] = ("LargeInternedString" + c).intern();
 111             rIdx++;
 112             if (rIdx >= WINDOW) {
 113                 rIdx = 0;
 114             }
 115         }
 116     }
 117 
 118 }