1 /*
   2  * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
   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 StringInternCleanup
  26  * @summary Check that Shenandoah cleans up interned strings
  27  *
  28  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark -Xmx64m -XX:ShenandoahGCHeuristics=passive      -XX:+ShenandoahDegeneratedGC -XX:+ShenandoahVerify StringInternCleanup
  29  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark -Xmx64m -XX:ShenandoahGCHeuristics=passive      -XX:-ShenandoahDegeneratedGC -XX:+ShenandoahVerify StringInternCleanup
  30  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark -Xmx64m -XX:ShenandoahGCHeuristics=passive      -XX:+ShenandoahDegeneratedGC                       StringInternCleanup
  31  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark -Xmx64m -XX:ShenandoahGCHeuristics=passive      -XX:-ShenandoahDegeneratedGC                       StringInternCleanup
  32  *
  33  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark -Xmx64m -XX:ShenandoahGCHeuristics=aggressive                         StringInternCleanup
  34 
  35  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark -Xmx64m -XX:ShenandoahGCHeuristics=adaptive     -XX:+ShenandoahVerify StringInternCleanup
  36  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark -Xmx64m -XX:ShenandoahGCHeuristics=static       -XX:+ShenandoahVerify StringInternCleanup
  37  *
  38  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark -Xmx64m -XX:ShenandoahGCHeuristics=adaptive                           StringInternCleanup
  39  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark -Xmx64m -XX:ShenandoahGCHeuristics=static                             StringInternCleanup
  40  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark -Xmx64m -XX:ShenandoahGCHeuristics=compact                            StringInternCleanup
  41  *
  42  * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:-ClassUnloadingWithConcurrentMark -Xmx64m                                                               StringInternCleanup
  43  */
  44 
  45 public class StringInternCleanup {
  46 
  47   static final int COUNT = 1_000_000;
  48   static final int WINDOW = 1_000;
  49 
  50   static final String[] reachable = new String[WINDOW];
  51 
  52   public static void main(String[] args) throws Exception {
  53     int rIdx = 0;
  54     for (int c = 0; c < COUNT; c++) {
  55       reachable[rIdx] = ("LargeInternedString" + c).intern();
  56       rIdx++;
  57       if (rIdx >= WINDOW) {
  58         rIdx = 0;
  59       }
  60     }
  61   }
  62 
  63 }