--- /dev/null 2018-11-30 10:10:44.238550338 +0100 +++ new/test/hotspot/jtreg/gc/shenandoah/compiler/TestReferenceCAS.java 2018-11-30 10:21:54.234980429 +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"); + } + } + +}