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annotate test/compiler/EscapeAnalysis/TestAllocatedEscapesPtrComparison.java @ 17959:42d9a5f06728

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8043354: OptimizePtrCompare too aggressive when allocations are present Summary: In bcEscapeAnalyzer update the _allocated_escapes flag if a var escapes the method. Reviewed-by: kvn
author rasbold
date Wed, 21 May 2014 10:54:59 -0700
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17959
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1 /*
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2 * Copyright 2014 Google, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /*
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25 * @test
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26 * @bug 8043354
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27 * @summary bcEscapeAnalyzer allocated_escapes not conservative enough
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28 * @run main/othervm -XX:CompileOnly=.visitAndPop TestAllocatedEscapesPtrComparison
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29 * @author Chuck Rasbold rasbold@google.com
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30 */
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31
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32 /*
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33 * Test always passes with -XX:-OptmimizePtrCompare
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34 */
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35
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36 import java.util.ArrayList;
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37 import java.util.List;
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38
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39 public class TestAllocatedEscapesPtrComparison {
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40
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41 static TestAllocatedEscapesPtrComparison dummy;
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42
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43 class Marker {
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44 }
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45
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46 List<Marker> markerList = new ArrayList<>();
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47
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48 // Suppress compilation of this method, it must be processed
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49 // by the bytecode escape analyzer.
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50
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51 // Make a new marker and put it on the List
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52 Marker getMarker() {
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53 // result escapes through markerList
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54 final Marker result = new Marker();
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55 markerList.add(result);
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56 return result;
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57 }
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58
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59 void visit(int depth) {
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60 // Make a new marker
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61 getMarker();
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62
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63 // Call visitAndPop every once in a while
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64 // Cap the depth of our recursive visits
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65 if (depth % 10 == 2) {
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66 visitAndPop(depth + 1);
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67 } else if (depth < 15) {
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68 visit(depth + 1);
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69 }
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70 }
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71
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72 void visitAndPop(int depth) {
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73 // Random dummy allocation to force EscapeAnalysis to process this method
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74 dummy = new TestAllocatedEscapesPtrComparison();
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75
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76 // Make a new marker
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77 Marker marker = getMarker();
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78
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79 visit(depth + 1);
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80
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81 // Walk and pop the marker list up to the current marker
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82 boolean found = false;
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83 for (int i = markerList.size() - 1; i >= 0; i--) {
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84 Marker removed = markerList.remove(i);
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85
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86 // In the failure, EA mistakenly converts this comparison to false
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87 if (removed == marker) {
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88 found = true;
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89 break;
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90 }
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91 }
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92
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93 if (!found) {
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94 throw new RuntimeException("test fails");
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95 }
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96 }
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97
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98
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99 public static void main(String args[]) {
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100 TestAllocatedEscapesPtrComparison tc = new TestAllocatedEscapesPtrComparison();
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101
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102 // Warmup and run enough times
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103 for (int i = 0; i < 20000; i++) {
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104 tc.visit(0);
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105 }
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106 }
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107 }