1 /*
  2  * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
  3  * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
  4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  5  *
  6  * This code is free software; you can redistribute it and/or modify it
  7  * under the terms of the GNU General Public License version 2 only, as
  8  * published by the Free Software Foundation.
  9  *
 10  * This code is distributed in the hope that it will be useful, but WITHOUT
 11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 13  * version 2 for more details (a copy is included in the LICENSE file that
 14  * accompanied this code).
 15  *
 16  * You should have received a copy of the GNU General Public License version
 17  * 2 along with this work; if not, write to the Free Software Foundation,
 18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 19  *
 20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 21  * or visit www.oracle.com if you need additional information or have any
 22  * questions.
 23  *
 24  */
 25 
 26 /*
 27  * @test id=passive
 28  * @summary Check that Shenandoah cleans up interned strings
 29  * @requires vm.gc.Shenandoah
 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 id=default
 54  * @summary Check that Shenandoah cleans up interned strings
 55  * @requires vm.gc.Shenandoah
 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 id=generational
 81  * @summary Check that Shenandoah cleans up interned strings
 82  * @requires vm.gc.Shenandoah
 83  *
 84  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
 85  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive -XX:ShenandoahGCMode=generational
 86  *      -XX:+ShenandoahVerify
 87  *      TestStringInternCleanup
 88  *
 89  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
 90  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive -XX:ShenandoahGCMode=generational
 91  *      TestStringInternCleanup
 92  */
 93 
 94 
 95 public class TestStringInternCleanup {
 96 
 97     static final int COUNT = 1_000_000;
 98     static final int WINDOW = 1_000;
 99 
100     static final String[] reachable = new String[WINDOW];
101 
102     public static void main(String[] args) throws Exception {
103         int rIdx = 0;
104         for (int c = 0; c < COUNT; c++) {
105             reachable[rIdx] = ("LargeInternedString" + c).intern();
106             rIdx++;
107             if (rIdx >= WINDOW) {
108                 rIdx = 0;
109             }
110         }
111     }
112 
113 }