1 /* 2 * Copyright (c) 2001, 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 24 /** 25 * @test 26 * @bug 6496524 27 * @summary Setting breakpoint in jdb crashes Hotspot JVM 28 * 29 * @author jjh 30 * 31 * @key intermittent 32 * @modules jdk.jdi 33 * @run build TestScaffold VMConnection TargetListener TargetAdapter 34 * @run compile -g BreakpointTest.java 35 * @run driver BreakpointTest 36 */ 37 import com.sun.jdi.*; 38 import com.sun.jdi.event.*; 39 import com.sun.jdi.request.*; 40 41 import java.util.*; 42 43 // The debuggee just runs in a loop. The debugger 44 // sets a bkpt on the Math.random call. When the 45 // bkpt is hit, the debugger disables it, resumes 46 // the debuggee, waits a bit, and enables the bkpt again. 47 48 class BreakpointTarg { 49 public final static int BKPT_LINE = 56; 50 // LINE NUMBER SENSITIVE 51 52 public static long count; 53 static void doit() { 54 Object[] roots = new Object[200000]; 55 while (true) { 56 int index = (int) (Math.random() * roots.length); // BKPT_LINE 57 // This println makes the test pass 58 //System.out.println("Debuggee: index = " + index); 59 roots[index] = new Object(); // bkpt here passes 60 // and null instead of new Object() 61 // passes 62 count++; 63 } 64 } 65 66 public static void main(String[] args) { 67 doit(); 68 } 69 } 70 71 /********** test program **********/ 72 73 public class BreakpointTest extends TestScaffold { 74 ClassType targetClass; 75 ThreadReference mainThread; 76 77 BreakpointTest (String args[]) { 78 super(args); 79 } 80 81 public static void main(String[] args) throws Exception { 82 new BreakpointTest(args).startTests(); 83 } 84 85 /********** event handlers **********/ 86 87 static int maxBkpts = 50; 88 int bkptCount; 89 BreakpointRequest bkptRequest; 90 Field debuggeeCountField; 91 92 // When we get a bkpt we want to disable the request, 93 // resume the debuggee, and then re-enable the request 94 public void breakpointReached(BreakpointEvent event) { 95 System.out.println("Got BreakpointEvent: " + bkptCount + 96 ", debuggeeCount = " + 97 ((LongValue)targetClass. 98 getValue(debuggeeCountField)).value() 99 ); 100 bkptRequest.disable(); 101 } 102 103 public void eventSetComplete(EventSet set) { 104 set.resume(); 105 106 // The main thread watchs the bkptCount to 107 // see if bkpts stop coming in. The 108 // test _should_ fail well before maxBkpts bkpts. 109 if (bkptCount++ < maxBkpts) { 110 try { 111 Thread.sleep(100); 112 } catch (InterruptedException ee) { 113 } 114 bkptRequest.enable(); 115 } 116 } 117 118 public void vmDisconnected(VMDisconnectEvent event) { 119 println("Got VMDisconnectEvent"); 120 } 121 122 /********** test core **********/ 123 124 protected void runTests() throws Exception { 125 /* 126 * Get to the top of main() 127 * to determine targetClass and mainThread 128 */ 129 BreakpointEvent bpe = startToMain("BreakpointTarg"); 130 targetClass = (ClassType)bpe.location().declaringType(); 131 mainThread = bpe.thread(); 132 EventRequestManager erm = vm().eventRequestManager(); 133 134 Location loc1 = findLocation( 135 targetClass, 136 BreakpointTarg.BKPT_LINE); 137 138 bkptRequest = erm.createBreakpointRequest(loc1); 139 bkptRequest.enable(); 140 debuggeeCountField = targetClass.fieldByName("count"); 141 try { 142 143 addListener (this); 144 } catch (Exception ex){ 145 ex.printStackTrace(); 146 failure("failure: Could not add listener"); 147 throw new Exception("BreakpointTest: failed"); 148 } 149 150 int prevBkptCount; 151 vm().resume(); 152 while (!vmDisconnected && bkptCount < maxBkpts) { 153 try { 154 Thread.sleep(5000); 155 } catch (InterruptedException ee) { 156 } 157 } 158 159 println("done with loop, final count = " + 160 ((LongValue)targetClass. 161 getValue(debuggeeCountField)).value()); 162 bkptRequest.disable(); 163 removeListener(this); 164 165 166 /* 167 * deal with results of test 168 * if anything has called failure("foo") testFailed will be true 169 */ 170 if (!testFailed) { 171 println("BreakpointTest: passed"); 172 } else { 173 throw new Exception("BreakpointTest: failed"); 174 } 175 } 176 }