1 /* 2 * Copyright (c) 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 TestRefprocSanity 27 * @summary Test that null references/referents work fine 28 * @requires vm.gc.Shenandoah & !vm.graal.enabled 29 * 30 * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions 31 * -XX:+UseShenandoahGC 32 * -XX:+ShenandoahVerify 33 * TestRefprocSanity 34 * 35 * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions 36 * -XX:+UseShenandoahGC 37 * TestRefprocSanity 38 * 39 * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions 40 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive 41 * TestRefprocSanity 42 */ 43 44 /* 45 * @test TestRefprocSanity 46 * @summary Test that null references/referents work fine 47 * @requires vm.gc.Shenandoah & !vm.graal.enabled 48 * 49 * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions 50 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu 51 * -XX:+ShenandoahVerify 52 * TestRefprocSanity 53 * 54 * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions 55 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu 56 * TestRefprocSanity 57 * 58 * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions 59 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu -XX:ShenandoahGCHeuristics=aggressive 60 * TestRefprocSanity 61 */ 62 63 import java.lang.ref.*; 64 65 public class TestRefprocSanity { 66 67 static final long TARGET_MB = Long.getLong("target", 10_000); // 10 Gb allocation 68 static final int WINDOW = 10_000; 69 70 static final Reference<MyObject>[] refs = new Reference[WINDOW]; 71 72 public static void main(String[] args) throws Exception { 73 long count = TARGET_MB * 1024 * 1024 / 32; 74 int rIdx = 0; 75 76 ReferenceQueue rq = new ReferenceQueue(); 77 78 for (int c = 0; c < WINDOW; c++) { 79 refs[c] = select(c, new MyObject(c), rq); 80 } 81 82 for (int c = 0; c < count; c++) { 83 verifyRefAt(rIdx); 84 refs[rIdx] = select(c, new MyObject(rIdx), rq); 85 86 rIdx++; 87 if (rIdx >= WINDOW) { 88 rIdx = 0; 89 } 90 while (rq.poll() != null); // drain 91 } 92 } 93 94 static Reference<MyObject> select(int v, MyObject ext, ReferenceQueue rq) { 95 switch (v % 10) { 96 case 0: return new SoftReference<MyObject>(null); 97 case 1: return new SoftReference<MyObject>(null, rq); 98 case 2: return new SoftReference<MyObject>(ext); 99 case 3: return new SoftReference<MyObject>(ext, rq); 100 case 4: return new WeakReference<MyObject>(null); 101 case 5: return new WeakReference<MyObject>(null, rq); 102 case 6: return new WeakReference<MyObject>(ext); 103 case 7: return new WeakReference<MyObject>(ext, rq); 104 case 8: return new PhantomReference<MyObject>(null, rq); 105 case 9: return new PhantomReference<MyObject>(ext, rq); 106 default: throw new IllegalStateException(); 107 } 108 } 109 110 static void verifyRefAt(int idx) { 111 Reference<MyObject> ref = refs[idx]; 112 MyObject mo = ref.get(); 113 if (mo != null && mo.x != idx) { 114 throw new IllegalStateException("Referent tag is incorrect: " + mo.x + ", should be " + idx); 115 } 116 } 117 118 static class MyObject { 119 final int x; 120 121 public MyObject(int x) { 122 this.x = x; 123 } 124 } 125 126 }