1 /*
   2  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.graalvm.compiler.core.test;
  24 
  25 import jdk.vm.ci.meta.ResolvedJavaMethod;
  26 
  27 import org.junit.Test;
  28 
  29 import org.graalvm.compiler.nodes.StructuredGraph;
  30 import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
  31 import org.graalvm.compiler.nodes.java.MonitorExitNode;
  32 import org.graalvm.compiler.nodes.java.RawMonitorEnterNode;
  33 import org.graalvm.compiler.nodes.spi.LoweringTool;
  34 import org.graalvm.compiler.phases.common.CanonicalizerPhase;
  35 import org.graalvm.compiler.phases.common.DeadCodeEliminationPhase;
  36 import org.graalvm.compiler.phases.common.LockEliminationPhase;
  37 import org.graalvm.compiler.phases.common.LoweringPhase;
  38 import org.graalvm.compiler.phases.common.ValueAnchorCleanupPhase;
  39 import org.graalvm.compiler.phases.common.inlining.InliningPhase;
  40 import org.graalvm.compiler.phases.tiers.HighTierContext;
  41 import org.graalvm.compiler.phases.tiers.PhaseContext;
  42 
  43 public class LockEliminationTest extends GraalCompilerTest {
  44 
  45     static class A {
  46 
  47         int value;
  48 
  49         public synchronized int getValue() {
  50             return value;
  51         }
  52     }
  53 
  54     static int field1;
  55     static int field2;
  56 
  57     public static void testSynchronizedSnippet(A x, A y) {
  58         synchronized (x) {
  59             field1 = x.value;
  60         }
  61         synchronized (x) {
  62             field2 = y.value;
  63         }
  64     }
  65 
  66     @Test
  67     public void testLock() {
  68         test("testSynchronizedSnippet", new A(), new A());
  69 
  70         StructuredGraph graph = getGraph("testSynchronizedSnippet");
  71         new CanonicalizerPhase().apply(graph, new PhaseContext(getProviders()));
  72         new LockEliminationPhase().apply(graph);
  73         assertDeepEquals(1, graph.getNodes().filter(RawMonitorEnterNode.class).count());
  74         assertDeepEquals(1, graph.getNodes().filter(MonitorExitNode.class).count());
  75     }
  76 
  77     public static void testSynchronizedMethodSnippet(A x) {
  78         int value1 = x.getValue();
  79         int value2 = x.getValue();
  80         field1 = value1;
  81         field2 = value2;
  82     }
  83 
  84     @Test
  85     public void testSynchronizedMethod() {
  86         test("testSynchronizedMethodSnippet", new A());
  87 
  88         StructuredGraph graph = getGraph("testSynchronizedMethodSnippet");
  89         new CanonicalizerPhase().apply(graph, new PhaseContext(getProviders()));
  90         new LockEliminationPhase().apply(graph);
  91         assertDeepEquals(1, graph.getNodes().filter(RawMonitorEnterNode.class).count());
  92         assertDeepEquals(1, graph.getNodes().filter(MonitorExitNode.class).count());
  93     }
  94 
  95     private StructuredGraph getGraph(String snippet) {
  96         ResolvedJavaMethod method = getResolvedJavaMethod(snippet);
  97         StructuredGraph graph = parseEager(method, AllowAssumptions.YES);
  98         HighTierContext context = getDefaultHighTierContext();
  99         new CanonicalizerPhase().apply(graph, context);
 100         new InliningPhase(new CanonicalizerPhase()).apply(graph, context);
 101         new CanonicalizerPhase().apply(graph, context);
 102         new DeadCodeEliminationPhase().apply(graph);
 103         new LoweringPhase(new CanonicalizerPhase(), LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);
 104         new ValueAnchorCleanupPhase().apply(graph);
 105         new LockEliminationPhase().apply(graph);
 106         return graph;
 107     }
 108 
 109 }