hotspot/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/ReferenceGetLoopTest.java
author kvn
Thu, 16 Feb 2017 15:46:09 -0800
changeset 43972 1ade39b8381b
child 46459 7d4e637d3f21
permissions -rw-r--r--
8174879: Rename jdk.vm.ci to jdk.internal.vm.ci Summary: Rename jdk.vm.ci and jdk.vm.compiler modules to jdk.internal.vm.ci and jdk.internal.vm.compiler. Reviewed-by: mchung, ihse, dnsimon
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/*
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 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package org.graalvm.compiler.core.test;
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import java.lang.ref.Reference;
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import java.lang.ref.ReferenceQueue;
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import java.lang.ref.WeakReference;
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import org.junit.Test;
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import org.graalvm.compiler.core.common.LocationIdentity;
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import org.graalvm.compiler.graph.Node;
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import org.graalvm.compiler.loop.LoopEx;
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import org.graalvm.compiler.loop.LoopsData;
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import org.graalvm.compiler.nodes.FieldLocationIdentity;
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import org.graalvm.compiler.nodes.StructuredGraph;
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import org.graalvm.compiler.nodes.memory.Access;
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import jdk.vm.ci.meta.ResolvedJavaField;
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public class ReferenceGetLoopTest extends GraalCompilerTest {
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    @Override
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    protected boolean checkMidTierGraph(StructuredGraph graph) {
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        final LoopsData loops = new LoopsData(graph);
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        boolean found = false;
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        for (LoopEx loop : loops.loops()) {
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            for (Node node : loop.inside().nodes()) {
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                if (node instanceof Access) {
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                    Access access = (Access) node;
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                    LocationIdentity location = access.getLocationIdentity();
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                    if (location instanceof FieldLocationIdentity) {
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                        ResolvedJavaField field = ((FieldLocationIdentity) location).getField();
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                        if (field.getName().equals("referent") && field.getDeclaringClass().equals(getMetaAccess().lookupJavaType(Reference.class))) {
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                            found = true;
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                        }
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                    }
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                }
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            }
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        }
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        if (!found) {
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            assertTrue(false, "Reference.referent not found in loop: " + getCanonicalGraphString(graph, true, false));
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        }
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        return true;
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    }
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    public volatile Object referent;
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    public final FinalWeakReference<Object> ref;
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    public final ReferenceQueue<Object> refQueue;
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    /*
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     * Ensure that the Reference.get invoke is statically bindable.
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     */
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    public static final class FinalWeakReference<T> extends WeakReference<T> {
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        public FinalWeakReference(T referent, ReferenceQueue<? super T> q) {
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            super(referent, q);
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        }
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    }
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    public ReferenceGetLoopTest() {
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        referent = new Object();
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        refQueue = new ReferenceQueue<>();
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        ref = new FinalWeakReference<>(referent, refQueue);
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    }
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    @Test
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    public void test() {
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        getCode(getMetaAccess().lookupJavaMethod(getMethod("testSnippet")));
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    }
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    public void testSnippet() {
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        while (ref.get() != null) {
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            // burn!
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        }
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    }
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}