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 * @key gc 29 * @requires vm.gc.Shenandoah & !vm.graal.enabled 30 * 31 * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions 32 * -XX:+UseShenandoahGC 33 * -XX:+ShenandoahVerify 34 * TestRefprocSanity 35 * 36 * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions 37 * -XX:+UseShenandoahGC 38 * TestRefprocSanity 39 * 40 * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions 41 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive 42 * TestRefprocSanity 43 */ 44 45 /* 46 * @test TestRefprocSanity 47 * @summary Test that null references/referents work fine 48 * @key gc 49 * @requires vm.gc.Shenandoah & !vm.graal.enabled 50 * 51 * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions 52 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu 53 * -XX:+ShenandoahVerify 54 * TestRefprocSanity 55 * 56 * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions 57 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu 58 * TestRefprocSanity 59 * 60 * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions 61 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu -XX:ShenandoahGCHeuristics=aggressive 62 * TestRefprocSanity 63 */ 64 65 import java.lang.ref.*; 66 67 public class TestRefprocSanity { 68 69 static final long TARGET_MB = Long.getLong("target", 10_000); // 10 Gb allocation 70 static final int WINDOW = 10_000; 71 72 static final Reference<MyObject>[] refs = new Reference[WINDOW]; 73 74 public static void main(String[] args) throws Exception { 75 long count = TARGET_MB * 1024 * 1024 / 32; 76 int rIdx = 0; 77 78 ReferenceQueue rq = new ReferenceQueue(); 79 80 for (int c = 0; c < WINDOW; c++) { 81 refs[c] = select(c, new MyObject(c), rq); 82 } 83 84 for (int c = 0; c < count; c++) { 85 verifyRefAt(rIdx); 86 refs[rIdx] = select(c, new MyObject(rIdx), rq); 87 88 rIdx++; 89 if (rIdx >= WINDOW) { 90 rIdx = 0; 91 } 92 while (rq.poll() != null); // drain 93 } 94 } 95 96 static Reference<MyObject> select(int v, MyObject ext, ReferenceQueue rq) { 97 switch (v % 10) { 98 case 0: return new SoftReference<MyObject>(null); 99 case 1: return new SoftReference<MyObject>(null, rq); 100 case 2: return new SoftReference<MyObject>(ext); 101 case 3: return new SoftReference<MyObject>(ext, rq); 102 case 4: return new WeakReference<MyObject>(null); 103 case 5: return new WeakReference<MyObject>(null, rq); 104 case 6: return new WeakReference<MyObject>(ext); 105 case 7: return new WeakReference<MyObject>(ext, rq); 106 case 8: return new PhantomReference<MyObject>(null, rq); 107 case 9: return new PhantomReference<MyObject>(ext, rq); 108 default: throw new IllegalStateException(); 109 } 110 } 111 112 static void verifyRefAt(int idx) { 113 Reference<MyObject> ref = refs[idx]; 114 MyObject mo = ref.get(); 115 if (mo != null && mo.x != idx) { 116 throw new IllegalStateException("Referent tag is incorrect: " + mo.x + ", should be " + idx); 117 } 118 } 119 120 static class MyObject { 121 final int x; 122 123 public MyObject(int x) { 124 this.x = x; 125 } 126 } 127 128 }