J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2001-2002 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /** |
| 25 | * @test |
| 26 | * @bug 4467564 |
| 27 | * @summary Test the popping of frames in an asynchronous context |
| 28 | * (that is, when suspended by the debugger at random points) |
| 29 | * |
| 30 | * @author Robert Field |
| 31 | * |
| 32 | * @run build TestScaffold VMConnection TargetListener TargetAdapter |
| 33 | * @run compile -g PopAsynchronousTest.java |
| 34 | * @run main PopAsynchronousTest |
| 35 | */ |
| 36 | import com.sun.jdi.*; |
| 37 | import com.sun.jdi.event.*; |
| 38 | import com.sun.jdi.request.*; |
| 39 | |
| 40 | import java.util.*; |
| 41 | |
| 42 | /********** target program **********/ |
| 43 | |
| 44 | class PopAsynchronousTarg { |
| 45 | static final int N = 30; |
| 46 | int fibonacci(int n) { |
| 47 | if (n <= 2) { |
| 48 | return 1; |
| 49 | } else { |
| 50 | return fibonacci(n-1) + fibonacci(n-2); |
| 51 | } |
| 52 | } |
| 53 | void report(int n, int result) { |
| 54 | System.out.println("fibonacci(" + n + ") = " + result); |
| 55 | } |
| 56 | public static void main(String[] args){ |
| 57 | int n = N; |
| 58 | System.out.println("Howdy!"); |
| 59 | PopAsynchronousTarg pat = new PopAsynchronousTarg(); |
| 60 | pat.report(n, pat.fibonacci(n)); |
| 61 | System.out.println("Goodbye from PopAsynchronousTarg!"); |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | /********** test program **********/ |
| 66 | |
| 67 | public class PopAsynchronousTest extends TestScaffold { |
| 68 | ReferenceType targetClass; |
| 69 | ThreadReference mainThread; |
| 70 | int result = -1; |
| 71 | boolean harassTarget = true; |
| 72 | Object harassLock = new Object(); |
| 73 | |
| 74 | PopAsynchronousTest (String args[]) { |
| 75 | super(args); |
| 76 | } |
| 77 | |
| 78 | public static void main(String[] args) throws Exception { |
| 79 | new PopAsynchronousTest(args).startTests(); |
| 80 | } |
| 81 | |
| 82 | |
| 83 | |
| 84 | /********** event handlers **********/ |
| 85 | |
| 86 | |
| 87 | public void breakpointReached(BreakpointEvent event) { |
| 88 | harassTarget = false; |
| 89 | synchronized(harassLock) { |
| 90 | try { |
| 91 | StackFrame frame = event.thread().frame(0); |
| 92 | LocalVariable lv = frame.visibleVariableByName("result"); |
| 93 | IntegerValue resultV = (IntegerValue)frame.getValue(lv); |
| 94 | result = resultV.value(); |
| 95 | } catch (Exception exc) { |
| 96 | exc.printStackTrace(System.err); |
| 97 | failure("TEST FAILURE: exception " + exc); |
| 98 | } |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | /********** test assist **********/ |
| 103 | |
| 104 | |
| 105 | class HarassThread extends Thread { |
| 106 | public void run() { |
| 107 | int harassCount = 0; |
| 108 | try { |
| 109 | int prev = 0; |
| 110 | int delayTime = 1; |
| 111 | |
| 112 | synchronized(harassLock) { |
| 113 | while (harassTarget && (harassCount < 10)) { |
| 114 | boolean backoff = true; |
| 115 | mainThread.suspend(); |
| 116 | StackFrame top = mainThread.frame(0); |
| 117 | Method meth = top.location().method(); |
| 118 | String methName = meth.name(); |
| 119 | if (methName.equals("fibonacci")) { |
| 120 | LocalVariable lv = top.visibleVariableByName("n"); |
| 121 | IntegerValue nV = (IntegerValue)top.getValue(lv); |
| 122 | int n = nV.value(); |
| 123 | if (n != prev) { |
| 124 | backoff = false; |
| 125 | StackFrame popThis = top; |
| 126 | Iterator it = mainThread.frames().iterator(); |
| 127 | |
| 128 | /* pop lowest fibonacci frame */ |
| 129 | while (it.hasNext()) { |
| 130 | StackFrame frame = (StackFrame)it.next(); |
| 131 | if (!frame.location().method().name().equals("fibonacci")) { |
| 132 | break; |
| 133 | } |
| 134 | popThis = frame; |
| 135 | } |
| 136 | println("popping fibonacci(" + n + ")"); |
| 137 | mainThread.popFrames(popThis); |
| 138 | ++harassCount; |
| 139 | prev = n; |
| 140 | } else { |
| 141 | println("ignoring another fibonacci(" + n + ")"); |
| 142 | } |
| 143 | } else { |
| 144 | println("ignoring " + methName); |
| 145 | } |
| 146 | if (backoff) { |
| 147 | delayTime *= 2; |
| 148 | } else { |
| 149 | delayTime /= 2; |
| 150 | if (delayTime < harassCount) { |
| 151 | delayTime = harassCount; |
| 152 | } |
| 153 | } |
| 154 | mainThread.resume(); |
| 155 | println("Delaying for " + delayTime + "ms"); |
| 156 | Thread.sleep(delayTime); |
| 157 | } |
| 158 | } |
| 159 | } catch (Exception exc) { |
| 160 | exc.printStackTrace(System.err); |
| 161 | failure("TEST FAILURE: exception " + exc); |
| 162 | } |
| 163 | println("Harassment complete, count = " + harassCount); |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | /********** test core **********/ |
| 168 | |
| 169 | protected void runTests() throws Exception { |
| 170 | /* |
| 171 | * Get to the top of main() |
| 172 | * to determine targetClass and mainThread |
| 173 | */ |
| 174 | BreakpointEvent bpe = startToMain("PopAsynchronousTarg"); |
| 175 | targetClass = bpe.location().declaringType(); |
| 176 | mainThread = bpe.thread(); |
| 177 | EventRequestManager erm = vm().eventRequestManager(); |
| 178 | |
| 179 | /* |
| 180 | * Set event requests |
| 181 | */ |
| 182 | List meths = targetClass.methodsByName("report"); |
| 183 | Location loc = ((Method)(meths.get(0))).location(); |
| 184 | BreakpointRequest request = erm.createBreakpointRequest(loc); |
| 185 | request.enable(); |
| 186 | |
| 187 | /* |
| 188 | * start popping wildly away |
| 189 | */ |
| 190 | (new HarassThread()).start(); |
| 191 | |
| 192 | /* |
| 193 | * resume the target listening for events |
| 194 | */ |
| 195 | listenUntilVMDisconnect(); |
| 196 | |
| 197 | /* |
| 198 | * check result |
| 199 | */ |
| 200 | int correct = (new PopAsynchronousTarg()). |
| 201 | fibonacci(PopAsynchronousTarg.N); |
| 202 | if (result == correct) { |
| 203 | println("Got expected result: " + result); |
| 204 | } else { |
| 205 | failure("FAIL: expected result: " + correct + |
| 206 | ", got: " + result); |
| 207 | } |
| 208 | |
| 209 | /* |
| 210 | * deal with results of test |
| 211 | * if anything has called failure("foo") testFailed will be true |
| 212 | */ |
| 213 | if (!testFailed) { |
| 214 | println("PopAsynchronousTest: passed"); |
| 215 | } else { |
| 216 | throw new Exception("PopAsynchronousTest: failed"); |
| 217 | } |
| 218 | } |
| 219 | } |