| /* |
| * Copyright (c) 2016, 2018, Red Hat, Inc. All rights reserved. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| /* |
| * Run standalone with: --add-exports java.base/jdk.internal.misc=ALL-UNNAMED --add-opens java.base/jdk.internal.misc=ALL-UNNAMED |
| */ |
| |
| /* |
| * @test TestReferenceCAS |
| * @summary Shenandoah reference CAS test |
| * @key gc |
| * @requires vm.gc.Shenandoah & !vm.graal.enabled |
| * @modules java.base/jdk.internal.misc:+open |
| * |
| * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC TestReferenceCAS |
| * @run main/othervm -Diters=100 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -Xint TestReferenceCAS |
| * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-TieredCompilation TestReferenceCAS |
| * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:TieredStopAtLevel=1 TestReferenceCAS |
| * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:TieredStopAtLevel=4 TestReferenceCAS |
| */ |
| |
| /* |
| * @test TestReferenceCAS |
| * @summary Shenandoah reference CAS test |
| * @key gc |
| * @requires vm.gc.Shenandoah & !vm.graal.enabled & (vm.bits == "64") |
| * @modules java.base/jdk.internal.misc:+open |
| * |
| * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops TestReferenceCAS |
| * @run main/othervm -Diters=100 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -Xint TestReferenceCAS |
| * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -XX:-TieredCompilation TestReferenceCAS |
| * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -XX:TieredStopAtLevel=1 TestReferenceCAS |
| * @run main/othervm -Diters=20000 -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseShenandoahGC -XX:-UseCompressedOops -XX:TieredStopAtLevel=4 TestReferenceCAS |
| */ |
| |
| import java.lang.reflect.Field; |
| |
| public class TestReferenceCAS { |
| |
| static final int ITERS = Integer.getInteger("iters", 1); |
| static final int WEAK_ATTEMPTS = Integer.getInteger("weakAttempts", 10); |
| |
| static final jdk.internal.misc.Unsafe UNSAFE; |
| static final long V_OFFSET; |
| |
| static { |
| try { |
| Field f = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe"); |
| f.setAccessible(true); |
| UNSAFE = (jdk.internal.misc.Unsafe) f.get(null); |
| } catch (Exception e) { |
| throw new RuntimeException("Unable to get Unsafe instance.", e); |
| } |
| |
| try { |
| Field vField = TestReferenceCAS.class.getDeclaredField("v"); |
| V_OFFSET = UNSAFE.objectFieldOffset(vField); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| Object v; |
| |
| private static void assertEquals(boolean a, boolean b, String msg) { |
| if (a != b) { |
| throw new RuntimeException("a (" + a + ") != b (" + b + "): " + msg); |
| } |
| } |
| |
| private static void assertEquals(Object a, Object b, String msg) { |
| if (!a.equals(b)) { |
| throw new RuntimeException("a (" + a.toString() + ") != b (" + b.toString() + "): " + msg); |
| } |
| } |
| |
| public static void main(String[] args) { |
| TestReferenceCAS t = new TestReferenceCAS(); |
| for (int c = 0; c < ITERS; c++) { |
| testAccess(t, V_OFFSET); |
| } |
| } |
| |
| static void testAccess(Object base, long offset) { |
| String foo = new String("foo"); |
| String bar = new String("bar"); |
| String baz = new String("baz"); |
| UNSAFE.putObject(base, offset, "foo"); |
| { |
| String newval = bar; |
| boolean r = UNSAFE.compareAndSetObject(base, offset, "foo", newval); |
| assertEquals(r, true, "success compareAndSet Object"); |
| assertEquals(newval, "bar", "must not destroy newval"); |
| Object x = UNSAFE.getObject(base, offset); |
| assertEquals(x, "bar", "success compareAndSet Object value"); |
| } |
| |
| { |
| String newval = baz; |
| boolean r = UNSAFE.compareAndSetObject(base, offset, "foo", newval); |
| assertEquals(r, false, "failing compareAndSet Object"); |
| assertEquals(newval, "baz", "must not destroy newval"); |
| Object x = UNSAFE.getObject(base, offset); |
| assertEquals(x, "bar", "failing compareAndSet Object value"); |
| } |
| |
| UNSAFE.putObject(base, offset, "bar"); |
| { |
| String newval = foo; |
| Object r = UNSAFE.compareAndExchangeObject(base, offset, "bar", newval); |
| assertEquals(r, "bar", "success compareAndExchange Object"); |
| assertEquals(newval, "foo", "must not destroy newval"); |
| Object x = UNSAFE.getObject(base, offset); |
| assertEquals(x, "foo", "success compareAndExchange Object value"); |
| } |
| |
| { |
| String newval = baz; |
| Object r = UNSAFE.compareAndExchangeObject(base, offset, "bar", newval); |
| assertEquals(r, "foo", "failing compareAndExchange Object"); |
| assertEquals(newval, "baz", "must not destroy newval"); |
| Object x = UNSAFE.getObject(base, offset); |
| assertEquals(x, "foo", "failing compareAndExchange Object value"); |
| } |
| |
| UNSAFE.putObject(base, offset, "bar"); |
| { |
| String newval = foo; |
| boolean success = false; |
| for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) { |
| success = UNSAFE.weakCompareAndSetObject(base, offset, "bar", newval); |
| assertEquals(newval, "foo", "must not destroy newval"); |
| } |
| assertEquals(success, true, "weakCompareAndSet Object"); |
| Object x = UNSAFE.getObject(base, offset); |
| assertEquals(x, "foo", "weakCompareAndSet Object"); |
| } |
| } |
| |
| } |