--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/gc/shenandoah/compiler/TestReferenceCAS.java Mon Dec 10 15:47:44 2018 +0100
@@ -0,0 +1,152 @@
+/*
+ * 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
+ * @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
+ *
+ * @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.putReference(base, offset, "foo");
+ {
+ String newval = bar;
+ boolean r = UNSAFE.compareAndSetReference(base, offset, "foo", newval);
+ assertEquals(r, true, "success compareAndSet Object");
+ assertEquals(newval, "bar", "must not destroy newval");
+ Object x = UNSAFE.getReference(base, offset);
+ assertEquals(x, "bar", "success compareAndSet Object value");
+ }
+
+ {
+ String newval = baz;
+ boolean r = UNSAFE.compareAndSetReference(base, offset, "foo", newval);
+ assertEquals(r, false, "failing compareAndSet Object");
+ assertEquals(newval, "baz", "must not destroy newval");
+ Object x = UNSAFE.getReference(base, offset);
+ assertEquals(x, "bar", "failing compareAndSet Object value");
+ }
+
+ UNSAFE.putReference(base, offset, "bar");
+ {
+ String newval = foo;
+ Object r = UNSAFE.compareAndExchangeReference(base, offset, "bar", newval);
+ assertEquals(r, "bar", "success compareAndExchange Object");
+ assertEquals(newval, "foo", "must not destroy newval");
+ Object x = UNSAFE.getReference(base, offset);
+ assertEquals(x, "foo", "success compareAndExchange Object value");
+ }
+
+ {
+ String newval = baz;
+ Object r = UNSAFE.compareAndExchangeReference(base, offset, "bar", newval);
+ assertEquals(r, "foo", "failing compareAndExchange Object");
+ assertEquals(newval, "baz", "must not destroy newval");
+ Object x = UNSAFE.getReference(base, offset);
+ assertEquals(x, "foo", "failing compareAndExchange Object value");
+ }
+
+ UNSAFE.putReference(base, offset, "bar");
+ {
+ String newval = foo;
+ boolean success = false;
+ for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
+ success = UNSAFE.weakCompareAndSetReference(base, offset, "bar", newval);
+ assertEquals(newval, "foo", "must not destroy newval");
+ }
+ assertEquals(success, true, "weakCompareAndSet Object");
+ Object x = UNSAFE.getReference(base, offset);
+ assertEquals(x, "foo", "weakCompareAndSet Object");
+ }
+ }
+
+}