1 /*
   2  * Copyright (c) 2015, 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.junit.Assert;
  26 import org.junit.Test;
  27 
  28 import org.graalvm.compiler.api.directives.GraalDirectives;
  29 import org.graalvm.compiler.nodes.GuardNode;
  30 import org.graalvm.compiler.nodes.StructuredGraph;
  31 import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
  32 import org.graalvm.compiler.nodes.spi.LoweringTool;
  33 import org.graalvm.compiler.phases.common.CanonicalizerPhase;
  34 import org.graalvm.compiler.phases.common.DominatorConditionalEliminationPhase;
  35 import org.graalvm.compiler.phases.common.LoweringPhase;
  36 import org.graalvm.compiler.phases.tiers.PhaseContext;
  37 
  38 /**
  39  * This test checks the combined action of
  40  * {@link org.graalvm.compiler.phases.common.DominatorConditionalEliminationPhase} and
  41  * {@link org.graalvm.compiler.phases.common.LoweringPhase}. The lowering phase needs to introduce
  42  * the null checks at the correct places for the dominator conditional elimination phase to pick
  43  * them up.
  44  */
  45 public class ConditionalEliminationTest10 extends ConditionalEliminationTestBase {
  46 
  47     private static class TestClass {
  48         int x;
  49     }
  50 
  51     @SuppressWarnings("all")
  52     public static int testSnippet(int a, TestClass t) {
  53         int result = 0;
  54         if (a == 0) {
  55             GraalDirectives.controlFlowAnchor();
  56             result = t.x;
  57         }
  58         GraalDirectives.controlFlowAnchor();
  59         return result + t.x;
  60     }
  61 
  62     @Test
  63     public void test1() {
  64         StructuredGraph graph = parseEager("testSnippet", AllowAssumptions.YES);
  65         PhaseContext context = new PhaseContext(getProviders());
  66         new LoweringPhase(new CanonicalizerPhase(), LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);
  67         Assert.assertEquals(2, graph.getNodes().filter(GuardNode.class).count());
  68         new DominatorConditionalEliminationPhase(true).apply(graph, context);
  69         Assert.assertEquals(1, graph.getNodes().filter(GuardNode.class).count());
  70     }
  71 }