1 /*
   2  * Copyright (c) 2011, 2015, 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 org.graalvm.compiler.debug.DebugContext;
  26 import org.graalvm.compiler.debug.DebugDumpScope;
  27 import org.graalvm.compiler.graph.Node;
  28 import org.graalvm.compiler.nodes.ReturnNode;
  29 import org.graalvm.compiler.nodes.StructuredGraph;
  30 import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
  31 import org.graalvm.compiler.nodes.extended.MonitorExit;
  32 import org.graalvm.compiler.nodes.memory.FloatingReadNode;
  33 import org.graalvm.compiler.nodes.spi.LoweringTool;
  34 import org.graalvm.compiler.phases.common.CanonicalizerPhase;
  35 import org.graalvm.compiler.phases.common.FloatingReadPhase;
  36 import org.graalvm.compiler.phases.common.LoweringPhase;
  37 import org.graalvm.compiler.phases.tiers.PhaseContext;
  38 import org.junit.Assert;
  39 import org.junit.Test;
  40 
  41 public class FloatingReadTest extends GraphScheduleTest {
  42 
  43     public static class Container {
  44 
  45         public int a;
  46     }
  47 
  48     public static void changeField(Container c) {
  49         c.a = 0xcafebabe;
  50     }
  51 
  52     public static synchronized int test1Snippet() {
  53         Container c = new Container();
  54         return c.a;
  55     }
  56 
  57     @Test
  58     public void test1() {
  59         test("test1Snippet");
  60     }
  61 
  62     @SuppressWarnings("try")
  63     private void test(final String snippet) {
  64         DebugContext debug = getDebugContext();
  65         try (DebugContext.Scope s = debug.scope("FloatingReadTest", new DebugDumpScope(snippet))) {
  66 
  67             StructuredGraph graph = parseEager(snippet, AllowAssumptions.YES);
  68             PhaseContext context = new PhaseContext(getProviders());
  69             new LoweringPhase(new CanonicalizerPhase(), LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);
  70             new FloatingReadPhase().apply(graph);
  71 
  72             ReturnNode returnNode = null;
  73             MonitorExit monitorexit = null;
  74 
  75             for (Node n : graph.getNodes()) {
  76                 if (n instanceof ReturnNode) {
  77                     assert returnNode == null;
  78                     returnNode = (ReturnNode) n;
  79                 } else if (n instanceof MonitorExit) {
  80                     monitorexit = (MonitorExit) n;
  81                 }
  82             }
  83 
  84             debug.dump(DebugContext.BASIC_LEVEL, graph, "After lowering");
  85 
  86             Assert.assertNotNull(returnNode);
  87             Assert.assertNotNull(monitorexit);
  88             Assert.assertTrue(returnNode.result() instanceof FloatingReadNode);
  89 
  90             FloatingReadNode read = (FloatingReadNode) returnNode.result();
  91 
  92             assertOrderedAfterSchedule(graph, read, (Node) monitorexit);
  93         } catch (Throwable e) {
  94             throw debug.handle(e);
  95         }
  96     }
  97 }