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 
  24 
  25 package org.graalvm.compiler.core.test;
  26 
  27 import org.graalvm.compiler.api.directives.GraalDirectives;
  28 import org.graalvm.compiler.debug.DebugContext;
  29 import org.graalvm.compiler.debug.DebugDumpScope;
  30 import org.graalvm.compiler.nodes.DeoptimizeNode;
  31 import org.graalvm.compiler.nodes.StructuredGraph;
  32 import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
  33 import org.graalvm.compiler.nodes.memory.ReadNode;
  34 import org.graalvm.compiler.nodes.spi.LoweringTool;
  35 import org.graalvm.compiler.phases.OptimisticOptimizations;
  36 import org.graalvm.compiler.phases.common.CanonicalizerPhase;
  37 import org.graalvm.compiler.phases.common.FloatingReadPhase;
  38 import org.graalvm.compiler.phases.common.GuardLoweringPhase;
  39 import org.graalvm.compiler.phases.common.LoweringPhase;
  40 import org.graalvm.compiler.phases.tiers.MidTierContext;
  41 import org.graalvm.compiler.phases.tiers.PhaseContext;
  42 import org.junit.Assert;
  43 import org.junit.Ignore;
  44 import org.junit.Test;
  45 
  46 /**
  47  * Tests that the hub access and the null check are folded.
  48  */
  49 public class ImplicitNullCheckTest extends GraphScheduleTest {
  50 
  51     public static final class Receiver {
  52 
  53         public int a;
  54     }
  55 
  56     public static int test1Snippet(Object o) {
  57         if (GraalDirectives.guardingNonNull(o) instanceof Receiver) {
  58             return 42;
  59         }
  60         return 0;
  61     }
  62 
  63     @Ignore("temporarily disable until LoadHub lowering is clarified")
  64     @Test
  65     public void test1() {
  66         test("test1Snippet");
  67     }
  68 
  69     @SuppressWarnings("try")
  70     private void test(final String snippet) {
  71         DebugContext debug = getDebugContext();
  72         try (DebugContext.Scope s = debug.scope("FloatingReadTest", new DebugDumpScope(snippet))) {
  73             StructuredGraph graph = parseEager(snippet, AllowAssumptions.YES, debug);
  74             PhaseContext context = new PhaseContext(getProviders());
  75             new LoweringPhase(new CanonicalizerPhase(), LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);
  76             new FloatingReadPhase().apply(graph);
  77             MidTierContext midTierContext = new MidTierContext(getProviders(), getTargetProvider(), OptimisticOptimizations.ALL, graph.getProfilingInfo());
  78             new GuardLoweringPhase().apply(graph, midTierContext);
  79 
  80             Assert.assertEquals(0, graph.getNodes(DeoptimizeNode.TYPE).count());
  81             Assert.assertTrue(graph.getNodes().filter(ReadNode.class).first().canNullCheck());
  82 
  83         } catch (Throwable e) {
  84             throw debug.handle(e);
  85         }
  86     }
  87 }