1 /* 2 * Copyright (c) 2018, Red Hat, Inc. All rights reserved. 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 TestRefprocSanity 26 * @summary Test that null references/referents work fine 27 * @key gc 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 * @key gc 48 * @requires vm.gc.Shenandoah & !vm.graal.enabled 49 * 50 * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions 51 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal 52 * -XX:+ShenandoahVerify 53 * TestRefprocSanity 54 * 55 * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions 56 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal 57 * TestRefprocSanity 58 * 59 * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions 60 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal -XX:ShenandoahGCHeuristics=aggressive 61 * TestRefprocSanity 62 */ 63 64 import java.lang.ref.*; 65 66 public class TestRefprocSanity { 67 68 static final long TARGET_MB = Long.getLong("target", 10_000); // 10 Gb allocation 69 static final int WINDOW = 10_000; 70 71 static final Reference<MyObject>[] refs = new Reference[WINDOW]; 72 73 public static void main(String[] args) throws Exception { 74 long count = TARGET_MB * 1024 * 1024 / 32; 75 int rIdx = 0; 76 77 ReferenceQueue rq = new ReferenceQueue(); 78 79 for (int c = 0; c < WINDOW; c++) { 80 refs[c] = select(c, new MyObject(c), rq); 81 } 82 83 for (int c = 0; c < count; c++) { 84 verifyRefAt(rIdx); 85 refs[rIdx] = select(c, new MyObject(rIdx), rq); 86 87 rIdx++; 88 if (rIdx >= WINDOW) { 89 rIdx = 0; 90 } 91 while (rq.poll() != null); // drain 92 } 93 } 94 95 static Reference<MyObject> select(int v, MyObject ext, ReferenceQueue rq) { 96 switch (v % 10) { 97 case 0: return new SoftReference<MyObject>(null); 98 case 1: return new SoftReference<MyObject>(null, rq); 99 case 2: return new SoftReference<MyObject>(ext); 100 case 3: return new SoftReference<MyObject>(ext, rq); 101 case 4: return new WeakReference<MyObject>(null); 102 case 5: return new WeakReference<MyObject>(null, rq); 103 case 6: return new WeakReference<MyObject>(ext); 104 case 7: return new WeakReference<MyObject>(ext, rq); 105 case 8: return new PhantomReference<MyObject>(null, rq); 106 case 9: return new PhantomReference<MyObject>(ext, rq); 107 default: throw new IllegalStateException(); 108 } 109 } 110 111 static void verifyRefAt(int idx) { 112 Reference<MyObject> ref = refs[idx]; 113 MyObject mo = ref.get(); 114 if (mo != null && mo.x != idx) { 115 throw new IllegalStateException("Referent tag is incorrect: " + mo.x + ", should be " + idx); 116 } 117 } 118 119 static class MyObject { 120 final int x; 121 122 public MyObject(int x) { 123 this.x = x; 124 } 125 } 126 127 }