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