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.graalvm.compiler.debug.DebugContext;
  26 import org.graalvm.compiler.nodes.StructuredGraph;
  27 import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
  28 import org.graalvm.compiler.phases.common.CanonicalizerPhase;
  29 import org.graalvm.compiler.phases.tiers.PhaseContext;
  30 import org.junit.Test;
  31 
  32 public class StraighteningTest extends GraalCompilerTest {
  33 
  34     private static final String REFERENCE_SNIPPET = "ref";
  35 
  36     public static boolean ref(int a, int b) {
  37         return a == b;
  38     }
  39 
  40     public static boolean test1Snippet(int a, int b) {
  41         int c = a;
  42         if (c == b) {
  43             c = 0x55;
  44         }
  45         if (c != 0x55) {
  46             return false;
  47         }
  48         return true;
  49     }
  50 
  51     public static boolean test3Snippet(int a, int b) {
  52         int val = (int) System.currentTimeMillis();
  53         int c = val + 1;
  54         if (a == b) {
  55             c = val;
  56         }
  57         if (c != val) {
  58             return false;
  59         }
  60         return true;
  61     }
  62 
  63     public static boolean test2Snippet(int a, int b) {
  64         int c;
  65         if (a == b) {
  66             c = 1;
  67         } else {
  68             c = 0;
  69         }
  70         return c == 1;
  71     }
  72 
  73     @Test(expected = AssertionError.class)
  74     public void test1() {
  75         test("test1Snippet");
  76     }
  77 
  78     public void test2() {
  79         test("test2Snippet");
  80     }
  81 
  82     @Test(expected = AssertionError.class)
  83     public void test3() {
  84         test("test3Snippet");
  85     }
  86 
  87     private void test(final String snippet) {
  88         // No debug scope to reduce console noise for @Test(expected = ...) tests
  89         StructuredGraph graph = parseEager(snippet, AllowAssumptions.YES);
  90         DebugContext debug = graph.getDebug();
  91         debug.dump(DebugContext.BASIC_LEVEL, graph, "Graph");
  92         new CanonicalizerPhase().apply(graph, new PhaseContext(getProviders()));
  93         StructuredGraph referenceGraph = parseEager(REFERENCE_SNIPPET, AllowAssumptions.YES);
  94         assertEquals(referenceGraph, graph);
  95     }
  96 }