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 org.junit.Test;
  26 
  27 import org.graalvm.compiler.nodes.GuardNode;
  28 import org.graalvm.compiler.nodes.StructuredGraph;
  29 import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
  30 import org.graalvm.compiler.nodes.spi.LoweringTool;
  31 import org.graalvm.compiler.phases.common.CanonicalizerPhase;
  32 import org.graalvm.compiler.phases.common.DominatorConditionalEliminationPhase;
  33 import org.graalvm.compiler.phases.common.FloatingReadPhase;
  34 import org.graalvm.compiler.phases.common.LoweringPhase;
  35 import org.graalvm.compiler.phases.tiers.PhaseContext;
  36 
  37 /**
  38  * Collection of tests for
  39  * {@link org.graalvm.compiler.phases.common.DominatorConditionalEliminationPhase} including those
  40  * that triggered bugs in this phase.
  41  */
  42 public class ConditionalEliminationTest2 extends ConditionalEliminationTestBase {
  43 
  44     public static Object field;
  45 
  46     static class Entry {
  47 
  48         final String name;
  49 
  50         Entry(String name) {
  51             this.name = name;
  52         }
  53     }
  54 
  55     static class EntryWithNext extends Entry {
  56 
  57         EntryWithNext(String name, Entry next) {
  58             super(name);
  59             this.next = next;
  60         }
  61 
  62         final Entry next;
  63     }
  64 
  65     public static Entry search(Entry start, String name, Entry alternative) {
  66         Entry current = start;
  67         do {
  68             while (current instanceof EntryWithNext) {
  69                 if (name != null && current.name == name) {
  70                     current = null;
  71                 } else {
  72                     Entry next = ((EntryWithNext) current).next;
  73                     current = next;
  74                 }
  75             }
  76 
  77             if (current != null) {
  78                 if (current.name.equals(name)) {
  79                     return current;
  80                 }
  81             }
  82             if (current == alternative) {
  83                 return null;
  84             }
  85             current = alternative;
  86 
  87         } while (true);
  88     }
  89 
  90     public static int testRedundantComparesSnippet(int[] array) {
  91         if (array == null) {
  92             return 0;
  93         }
  94         return array[0] + array[1] + array[2] + array[3];
  95     }
  96 
  97     @Test
  98     public void testRedundantCompares() {
  99         StructuredGraph graph = parseEager("testRedundantComparesSnippet", AllowAssumptions.YES);
 100         CanonicalizerPhase canonicalizer = new CanonicalizerPhase();
 101         PhaseContext context = new PhaseContext(getProviders());
 102 
 103         new LoweringPhase(canonicalizer, LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);
 104         canonicalizer.apply(graph, context);
 105         new FloatingReadPhase().apply(graph);
 106         new DominatorConditionalEliminationPhase(true).apply(graph, context);
 107         canonicalizer.apply(graph, context);
 108 
 109         assertDeepEquals(1, graph.getNodes().filter(GuardNode.class).count());
 110     }
 111 
 112     public static String testInstanceOfCheckCastSnippet(Object e) {
 113         if (e instanceof Entry) {
 114             return ((Entry) e).name;
 115         }
 116         return null;
 117     }
 118 
 119     @Test
 120     public void testInstanceOfCheckCastLowered() {
 121         StructuredGraph graph = parseEager("testInstanceOfCheckCastSnippet", AllowAssumptions.YES);
 122 
 123         CanonicalizerPhase canonicalizer = new CanonicalizerPhase();
 124         PhaseContext context = new PhaseContext(getProviders());
 125 
 126         new LoweringPhase(canonicalizer, LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);
 127         canonicalizer.apply(graph, context);
 128         new DominatorConditionalEliminationPhase(true).apply(graph, context);
 129         canonicalizer.apply(graph, context);
 130 
 131         assertDeepEquals(0, graph.getNodes().filter(GuardNode.class).count());
 132     }
 133 
 134 }