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/*
* 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");
}
}
}
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