| /* |
| * Copyright (c) 2001, 2002, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /** |
| * @test |
| * @bug 4467564 |
| * @summary Test the popping of frames in an asynchronous context |
| * (that is, when suspended by the debugger at random points) |
| * |
| * @author Robert Field |
| * |
| * @run build TestScaffold VMConnection TargetListener TargetAdapter |
| * @run compile -g PopAsynchronousTest.java |
| * @run main PopAsynchronousTest |
| */ |
| import com.sun.jdi.*; |
| import com.sun.jdi.event.*; |
| import com.sun.jdi.request.*; |
| |
| import java.util.*; |
| |
| /********** target program **********/ |
| |
| class PopAsynchronousTarg { |
| static final int N = 30; |
| int fibonacci(int n) { |
| if (n <= 2) { |
| return 1; |
| } else { |
| return fibonacci(n-1) + fibonacci(n-2); |
| } |
| } |
| void report(int n, int result) { |
| System.out.println("fibonacci(" + n + ") = " + result); |
| } |
| public static void main(String[] args){ |
| int n = N; |
| System.out.println("Howdy!"); |
| PopAsynchronousTarg pat = new PopAsynchronousTarg(); |
| pat.report(n, pat.fibonacci(n)); |
| System.out.println("Goodbye from PopAsynchronousTarg!"); |
| } |
| } |
| |
| /********** test program **********/ |
| |
| public class PopAsynchronousTest extends TestScaffold { |
| ReferenceType targetClass; |
| ThreadReference mainThread; |
| int result = -1; |
| boolean harassTarget = true; |
| Object harassLock = new Object(); |
| |
| PopAsynchronousTest (String args[]) { |
| super(args); |
| } |
| |
| public static void main(String[] args) throws Exception { |
| new PopAsynchronousTest(args).startTests(); |
| } |
| |
| |
| |
| /********** event handlers **********/ |
| |
| |
| public void breakpointReached(BreakpointEvent event) { |
| harassTarget = false; |
| synchronized(harassLock) { |
| try { |
| StackFrame frame = event.thread().frame(0); |
| LocalVariable lv = frame.visibleVariableByName("result"); |
| IntegerValue resultV = (IntegerValue)frame.getValue(lv); |
| result = resultV.value(); |
| } catch (Exception exc) { |
| exc.printStackTrace(System.err); |
| failure("TEST FAILURE: exception " + exc); |
| } |
| } |
| } |
| |
| /********** test assist **********/ |
| |
| |
| class HarassThread extends Thread { |
| public void run() { |
| int harassCount = 0; |
| try { |
| int prev = 0; |
| int delayTime = 1; |
| |
| synchronized(harassLock) { |
| while (harassTarget && (harassCount < 10)) { |
| boolean backoff = true; |
| mainThread.suspend(); |
| StackFrame top = mainThread.frame(0); |
| Method meth = top.location().method(); |
| String methName = meth.name(); |
| if (methName.equals("fibonacci")) { |
| LocalVariable lv = top.visibleVariableByName("n"); |
| IntegerValue nV = (IntegerValue)top.getValue(lv); |
| int n = nV.value(); |
| if (n != prev) { |
| backoff = false; |
| StackFrame popThis = top; |
| Iterator it = mainThread.frames().iterator(); |
| |
| /* pop lowest fibonacci frame */ |
| while (it.hasNext()) { |
| StackFrame frame = (StackFrame)it.next(); |
| if (!frame.location().method().name().equals("fibonacci")) { |
| break; |
| } |
| popThis = frame; |
| } |
| println("popping fibonacci(" + n + ")"); |
| mainThread.popFrames(popThis); |
| ++harassCount; |
| prev = n; |
| } else { |
| println("ignoring another fibonacci(" + n + ")"); |
| } |
| } else { |
| println("ignoring " + methName); |
| } |
| if (backoff) { |
| delayTime *= 2; |
| } else { |
| delayTime /= 2; |
| if (delayTime < harassCount) { |
| delayTime = harassCount; |
| } |
| } |
| mainThread.resume(); |
| println("Delaying for " + delayTime + "ms"); |
| Thread.sleep(delayTime); |
| } |
| } |
| } catch (Exception exc) { |
| exc.printStackTrace(System.err); |
| failure("TEST FAILURE: exception " + exc); |
| } |
| println("Harassment complete, count = " + harassCount); |
| } |
| } |
| |
| /********** test core **********/ |
| |
| protected void runTests() throws Exception { |
| /* |
| * Get to the top of main() |
| * to determine targetClass and mainThread |
| */ |
| BreakpointEvent bpe = startToMain("PopAsynchronousTarg"); |
| targetClass = bpe.location().declaringType(); |
| mainThread = bpe.thread(); |
| EventRequestManager erm = vm().eventRequestManager(); |
| |
| /* |
| * Set event requests |
| */ |
| List meths = targetClass.methodsByName("report"); |
| Location loc = ((Method)(meths.get(0))).location(); |
| BreakpointRequest request = erm.createBreakpointRequest(loc); |
| request.enable(); |
| |
| /* |
| * start popping wildly away |
| */ |
| (new HarassThread()).start(); |
| |
| /* |
| * resume the target listening for events |
| */ |
| listenUntilVMDisconnect(); |
| |
| /* |
| * check result |
| */ |
| int correct = (new PopAsynchronousTarg()). |
| fibonacci(PopAsynchronousTarg.N); |
| if (result == correct) { |
| println("Got expected result: " + result); |
| } else { |
| failure("FAIL: expected result: " + correct + |
| ", got: " + result); |
| } |
| |
| /* |
| * deal with results of test |
| * if anything has called failure("foo") testFailed will be true |
| */ |
| if (!testFailed) { |
| println("PopAsynchronousTest: passed"); |
| } else { |
| throw new Exception("PopAsynchronousTest: failed"); |
| } |
| } |
| } |