1 /* 2 * Copyright (c) 2016, 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 * Run standalone with: --add-exports java.base/jdk.internal.misc=ALL-UNNAMED --add-opens java.base/jdk.internal.misc=ALL-UNNAMED 26 */ 27 28 /* 29 * @test TestReferenceCAS 30 * @summary Shenandoah reference CAS test 31 * @key gc 32 * @requires vm.gc.Shenandoah & !vm.graal.enabled 33 * @modules java.base/jdk.internal.misc:+open 34 * 35 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC TestReferenceCAS 36 * @run main/othervm -Diters=100 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -Xint TestReferenceCAS 37 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-TieredCompilation TestReferenceCAS 38 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:TieredStopAtLevel=1 TestReferenceCAS 39 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:TieredStopAtLevel=4 TestReferenceCAS 40 * 41 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops TestReferenceCAS 42 * @run main/othervm -Diters=100 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -Xint TestReferenceCAS 43 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -XX:-TieredCompilation TestReferenceCAS 44 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -XX:TieredStopAtLevel=1 TestReferenceCAS 45 * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -XX:TieredStopAtLevel=4 TestReferenceCAS 46 */ 47 48 import java.lang.reflect.Field; 49 50 public class TestReferenceCAS { 51 52 static final int ITERS = Integer.getInteger("iters", 1); 53 static final int WEAK_ATTEMPTS = Integer.getInteger("weakAttempts", 10); 54 55 static final jdk.internal.misc.Unsafe UNSAFE; 56 static final long V_OFFSET; 57 58 static { 59 try { 60 Field f = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe"); 61 f.setAccessible(true); 62 UNSAFE = (jdk.internal.misc.Unsafe) f.get(null); 63 } catch (Exception e) { 64 throw new RuntimeException("Unable to get Unsafe instance.", e); 65 } 66 67 try { 68 Field vField = TestReferenceCAS.class.getDeclaredField("v"); 69 V_OFFSET = UNSAFE.objectFieldOffset(vField); 70 } catch (Exception e) { 71 throw new RuntimeException(e); 72 } 73 } 74 75 Object v; 76 77 private static void assertEquals(boolean a, boolean b, String msg) { 78 if (a != b) { 79 throw new RuntimeException("a (" + a + ") != b (" + b + "): " + msg); 80 } 81 } 82 83 private static void assertEquals(Object a, Object b, String msg) { 84 if (!a.equals(b)) { 85 throw new RuntimeException("a (" + a.toString() + ") != b (" + b.toString() + "): " + msg); 86 } 87 } 88 89 public static void main(String[] args) { 90 TestReferenceCAS t = new TestReferenceCAS(); 91 for (int c = 0; c < ITERS; c++) { 92 testAccess(t, V_OFFSET); 93 } 94 } 95 96 static void testAccess(Object base, long offset) { 97 String foo = new String("foo"); 98 String bar = new String("bar"); 99 String baz = new String("baz"); 100 UNSAFE.putReference(base, offset, "foo"); 101 { 102 String newval = bar; 103 boolean r = UNSAFE.compareAndSetReference(base, offset, "foo", newval); 104 assertEquals(r, true, "success compareAndSet Object"); 105 assertEquals(newval, "bar", "must not destroy newval"); 106 Object x = UNSAFE.getReference(base, offset); 107 assertEquals(x, "bar", "success compareAndSet Object value"); 108 } 109 110 { 111 String newval = baz; 112 boolean r = UNSAFE.compareAndSetReference(base, offset, "foo", newval); 113 assertEquals(r, false, "failing compareAndSet Object"); 114 assertEquals(newval, "baz", "must not destroy newval"); 115 Object x = UNSAFE.getReference(base, offset); 116 assertEquals(x, "bar", "failing compareAndSet Object value"); 117 } 118 119 UNSAFE.putReference(base, offset, "bar"); 120 { 121 String newval = foo; 122 Object r = UNSAFE.compareAndExchangeReference(base, offset, "bar", newval); 123 assertEquals(r, "bar", "success compareAndExchange Object"); 124 assertEquals(newval, "foo", "must not destroy newval"); 125 Object x = UNSAFE.getReference(base, offset); 126 assertEquals(x, "foo", "success compareAndExchange Object value"); 127 } 128 129 { 130 String newval = baz; 131 Object r = UNSAFE.compareAndExchangeReference(base, offset, "bar", newval); 132 assertEquals(r, "foo", "failing compareAndExchange Object"); 133 assertEquals(newval, "baz", "must not destroy newval"); 134 Object x = UNSAFE.getReference(base, offset); 135 assertEquals(x, "foo", "failing compareAndExchange Object value"); 136 } 137 138 UNSAFE.putReference(base, offset, "bar"); 139 { 140 String newval = foo; 141 boolean success = false; 142 for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) { 143 success = UNSAFE.weakCompareAndSetReference(base, offset, "bar", newval); 144 assertEquals(newval, "foo", "must not destroy newval"); 145 } 146 assertEquals(success, true, "weakCompareAndSet Object"); 147 Object x = UNSAFE.getReference(base, offset); 148 assertEquals(x, "foo", "weakCompareAndSet Object"); 149 } 150 } 151 152 }