001/*
002 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.compiler.test;
024
025import jdk.internal.jvmci.meta.*;
026
027import org.junit.*;
028
029import com.oracle.graal.nodes.*;
030import com.oracle.graal.nodes.StructuredGraph.AllowAssumptions;
031import com.oracle.graal.nodes.java.*;
032import com.oracle.graal.nodes.spi.*;
033import com.oracle.graal.phases.common.*;
034import com.oracle.graal.phases.common.inlining.*;
035import com.oracle.graal.phases.tiers.*;
036
037public class LockEliminationTest extends GraalCompilerTest {
038
039    static class A {
040
041        int value;
042
043        public synchronized int getValue() {
044            return value;
045        }
046    }
047
048    static int field1;
049    static int field2;
050
051    public static void testSynchronizedSnippet(A x, A y) {
052        synchronized (x) {
053            field1 = x.value;
054        }
055        synchronized (x) {
056            field2 = y.value;
057        }
058    }
059
060    @Test
061    public void testLock() {
062        test("testSynchronizedSnippet", new A(), new A());
063
064        StructuredGraph graph = getGraph("testSynchronizedSnippet");
065        new CanonicalizerPhase().apply(graph, new PhaseContext(getProviders()));
066        new LockEliminationPhase().apply(graph);
067        assertDeepEquals(1, graph.getNodes().filter(RawMonitorEnterNode.class).count());
068        assertDeepEquals(1, graph.getNodes().filter(MonitorExitNode.class).count());
069    }
070
071    public static void testSynchronizedMethodSnippet(A x) {
072        int value1 = x.getValue();
073        int value2 = x.getValue();
074        field1 = value1;
075        field2 = value2;
076    }
077
078    @Test
079    public void testSynchronizedMethod() {
080        test("testSynchronizedMethodSnippet", new A());
081
082        StructuredGraph graph = getGraph("testSynchronizedMethodSnippet");
083        new CanonicalizerPhase().apply(graph, new PhaseContext(getProviders()));
084        new LockEliminationPhase().apply(graph);
085        assertDeepEquals(1, graph.getNodes().filter(RawMonitorEnterNode.class).count());
086        assertDeepEquals(1, graph.getNodes().filter(MonitorExitNode.class).count());
087    }
088
089    private StructuredGraph getGraph(String snippet) {
090        ResolvedJavaMethod method = getResolvedJavaMethod(snippet);
091        StructuredGraph graph = parseEager(method, AllowAssumptions.YES);
092        HighTierContext context = getDefaultHighTierContext();
093        new CanonicalizerPhase().apply(graph, context);
094        new InliningPhase(new CanonicalizerPhase()).apply(graph, context);
095        new CanonicalizerPhase().apply(graph, context);
096        new DeadCodeEliminationPhase().apply(graph);
097        new LoweringPhase(new CanonicalizerPhase(), LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);
098        new ValueAnchorCleanupPhase().apply(graph);
099        new LockEliminationPhase().apply(graph);
100        return graph;
101    }
102
103}