1 /* 2 * Copyright (c) 2011, 2018, 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 * @test 26 * @key stress gc 27 * 28 * @summary converted from VM Testbase gc/gctests/GcPointerCheckTest. 29 * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent, jrockit] 30 * VM Testbase readme: 31 * DESCRIPTION 32 * Test that no pointers are broken. 33 * 34 * COMMENTS 35 * This test was ported from JRockit test suite. 36 * 37 * @library /vmTestbase 38 * /test/lib 39 * @run driver jdk.test.lib.FileInstaller . . 40 * @run main/othervm -XX:-UseGCOverheadLimit gc.gctests.GcPointerCheckTest.GcPointerCheckTest 41 */ 42 43 package gc.gctests.GcPointerCheckTest; 44 45 import nsk.share.TestFailure; 46 import nsk.share.gc.GC; 47 import nsk.share.gc.ThreadedGCTest; 48 import nsk.share.test.ExecutionController; 49 50 /** 51 * Test that no pointers are broken. 52 */ 53 public class GcPointerCheckTest extends ThreadedGCTest { 54 55 @Override 56 protected Runnable createRunnable(int i) { 57 return new Test(); 58 } 59 60 class Test implements Runnable { 61 62 /** 63 * Helper class for linking objects together. 64 */ 65 private class PointerHelper { 66 67 public PointerHelper next; 68 } 69 private PointerHelper first; 70 ExecutionController stresser; 71 72 @Override 73 public void run() { 74 if (stresser == null) { 75 stresser = getExecutionController(); 76 } 77 while (stresser.continueExecution()) { 78 testGcPointers(); 79 } 80 } 81 82 /** 83 * Create a lot of objects and link them together, then verify 84 * that the pointers are pointing to the correct type of objects. 85 * 86 * @return success if all references points to the correct type 87 * of object. 88 */ 89 public void testGcPointers() { 90 91 int innerIters = 1; 92 int outerIters = 200; 93 94 PointerHelper tmp1; 95 PointerHelper tmp2; 96 97 while (outerIters > 0) { 98 int i = 0; 99 tmp1 = new PointerHelper(); 100 this.first = tmp1; 101 102 while (i != innerIters) { 103 i++; 104 tmp2 = new PointerHelper(); 105 tmp1.next = tmp2; 106 tmp1 = tmp2; 107 tmp2 = new PointerHelper(); 108 } 109 110 outerIters--; 111 112 if (!checkRefs()) { 113 throw new TestFailure("Some references were bad"); 114 } 115 } 116 } 117 118 private boolean checkRefs() { 119 PointerHelper iter = this.first; 120 121 for (int i = 0; iter != null; iter = iter.next) { 122 i++; 123 124 if (iter.getClass() != PointerHelper.class) { 125 //("GC causer bad ref on " + i); 126 return false; 127 } 128 } 129 130 return true; 131 } 132 } 133 134 public static void main(String[] args) { 135 GC.runTest(new GcPointerCheckTest(), args); 136 } 137 }