--- /dev/null 2017-01-22 10:16:57.869617664 -0800 +++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/ReferenceGetLoopTest.java 2017-02-15 16:57:46.448432148 -0800 @@ -0,0 +1,96 @@ +/* + * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * 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. + */ +package org.graalvm.compiler.core.test; + +import java.lang.ref.Reference; +import java.lang.ref.ReferenceQueue; +import java.lang.ref.WeakReference; + +import org.junit.Test; + +import org.graalvm.compiler.core.common.LocationIdentity; +import org.graalvm.compiler.graph.Node; +import org.graalvm.compiler.loop.LoopEx; +import org.graalvm.compiler.loop.LoopsData; +import org.graalvm.compiler.nodes.FieldLocationIdentity; +import org.graalvm.compiler.nodes.StructuredGraph; +import org.graalvm.compiler.nodes.memory.Access; + +import jdk.vm.ci.meta.ResolvedJavaField; + +public class ReferenceGetLoopTest extends GraalCompilerTest { + + @Override + protected boolean checkMidTierGraph(StructuredGraph graph) { + final LoopsData loops = new LoopsData(graph); + boolean found = false; + for (LoopEx loop : loops.loops()) { + for (Node node : loop.inside().nodes()) { + if (node instanceof Access) { + Access access = (Access) node; + LocationIdentity location = access.getLocationIdentity(); + if (location instanceof FieldLocationIdentity) { + ResolvedJavaField field = ((FieldLocationIdentity) location).getField(); + if (field.getName().equals("referent") && field.getDeclaringClass().equals(getMetaAccess().lookupJavaType(Reference.class))) { + found = true; + } + } + } + } + } + if (!found) { + assertTrue(false, "Reference.referent not found in loop: " + getCanonicalGraphString(graph, true, false)); + } + return true; + } + + public volatile Object referent; + public final FinalWeakReference ref; + public final ReferenceQueue refQueue; + + /* + * Ensure that the Reference.get invoke is statically bindable. + */ + public static final class FinalWeakReference extends WeakReference { + public FinalWeakReference(T referent, ReferenceQueue q) { + super(referent, q); + } + } + + public ReferenceGetLoopTest() { + referent = new Object(); + refQueue = new ReferenceQueue<>(); + ref = new FinalWeakReference<>(referent, refQueue); + } + + @Test + public void test() { + getCode(getMetaAccess().lookupJavaMethod(getMethod("testSnippet"))); + } + + public void testSnippet() { + while (ref.get() != null) { + // burn! + } + } +}