1 /*
   2  * Copyright (c) 2017, 2018, Red Hat, Inc. 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 /*
  26  * @test TestStringInternCleanup
  27  * @summary Check that Shenandoah cleans up interned strings
  28  * @key gc
  29  * @requires vm.gc.Shenandoah & !vm.graal.enabled
  30  *
  31  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  32  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  33  *      -XX:+ShenandoahDegeneratedGC -XX:+ShenandoahVerify
  34  *      TestStringInternCleanup
  35  *
  36  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  37  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  38  *      -XX:-ShenandoahDegeneratedGC -XX:+ShenandoahVerify
  39  *      TestStringInternCleanup
  40  *
  41  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  42  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  43  *      -XX:+ShenandoahDegeneratedGC
  44  *      TestStringInternCleanup
  45  *
  46  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  47  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  48  *      -XX:-ShenandoahDegeneratedGC
  49  *      TestStringInternCleanup
  50  */
  51 
  52 /*
  53  * @test TestStringInternCleanup
  54  * @summary Check that Shenandoah cleans up interned strings
  55  * @key gc
  56  * @requires vm.gc.Shenandoah & !vm.graal.enabled
  57  *
  58  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  59  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
  60  *      TestStringInternCleanup
  61  *
  62  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  63  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
  64  *      -XX:+ShenandoahVerify
  65  *      TestStringInternCleanup
  66  *
  67  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  68  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
  69  *      TestStringInternCleanup
  70  *
  71  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  72  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact
  73  *      TestStringInternCleanup
  74  *
  75  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:-ClassUnloadingWithConcurrentMark
  76  *      -XX:+UseShenandoahGC
  77  *      TestStringInternCleanup
  78  */
  79 
  80 public class TestStringInternCleanup {
  81 
  82     static final int COUNT = 1_000_000;
  83     static final int WINDOW = 1_000;
  84 
  85     static final String[] reachable = new String[WINDOW];
  86 
  87     public static void main(String[] args) throws Exception {
  88         int rIdx = 0;
  89         for (int c = 0; c < COUNT; c++) {
  90             reachable[rIdx] = ("LargeInternedString" + c).intern();
  91             rIdx++;
  92             if (rIdx >= WINDOW) {
  93                 rIdx = 0;
  94             }
  95         }
  96     }
  97 
  98 }