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 * 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

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 */

//    THIS TEST IS LINE NUMBER SENSITIVE

/**

 * @test

 * @bug 6496524

 * @key intermittent

 * @summary Setting breakpoint in jdb crashes Hotspot JVM

 * @author jjh

 *

 * @run build TestScaffold VMConnection TargetListener TargetAdapter

 * @run compile -g BreakpointTest.java

 * @run driver BreakpointTest

 */

import com.sun.jdi.*;

import com.sun.jdi.event.*;

import com.sun.jdi.request.*;

import java.util.*;

// The debuggee just runs in a loop. The debugger

// sets a bkpt on the Math.random call.  When the

// bkpt is hit, the debugger disables it, resumes

// the debuggee, waits a bit, and enables the bkpt again.

class BreakpointTarg {

    public final static int BKPT_LINE = 56;

    public static long count;

    static void doit() {

        Object[] roots = new Object[200000];

        while (true) {

            int index = (int) (Math.random() * roots.length); // BKPT_LINE

            // This println makes the test pass

            //System.out.println("Debuggee: index = " + index);

            roots[index] = new Object();   // bkpt here passes

                                           // and null instead of new Object()

                                           // passes

            count++;

        }

    }

    public static void main(String[] args) {

        doit();

    }

}

    /********** test program **********/

public class BreakpointTest extends TestScaffold {

    ClassType targetClass;

    ThreadReference mainThread;

    BreakpointTest (String args[]) {

        super(args);

    }

    public static void main(String[] args)      throws Exception {

        new BreakpointTest(args).startTests();

    }

    /********** event handlers **********/

    static int maxBkpts = 50;

    int bkptCount;

    BreakpointRequest bkptRequest;

    Field debuggeeCountField;

    // When we get a bkpt we want to disable the request,

    // resume the debuggee, and then re-enable the request

    public void breakpointReached(BreakpointEvent event) {

        System.out.println("Got BreakpointEvent: " + bkptCount +

                           ", debuggeeCount = " +

                           ((LongValue)targetClass.

                            getValue(debuggeeCountField)).value()

                           );

        bkptRequest.disable();

    }

    public void eventSetComplete(EventSet set) {

        set.resume();

        // The main thread watchs the bkptCount to

        // see if bkpts stop coming in.  The

        // test _should_ fail well before maxBkpts bkpts.

        if (bkptCount++ < maxBkpts) {

            try {

                Thread.sleep(100);

            } catch (InterruptedException ee) {

            }

            bkptRequest.enable();

        }

    }

    public void vmDisconnected(VMDisconnectEvent event) {

        println("Got VMDisconnectEvent");

    }

    /********** test core **********/

    protected void runTests() throws Exception {

        /*

         * Get to the top of main()

         * to determine targetClass and mainThread

         */

        BreakpointEvent bpe = startToMain("BreakpointTarg");

        targetClass = (ClassType)bpe.location().declaringType();

        mainThread = bpe.thread();

        EventRequestManager erm = vm().eventRequestManager();

        Location loc1 = findLocation(

                            targetClass,

                            BreakpointTarg.BKPT_LINE);

        bkptRequest = erm.createBreakpointRequest(loc1);

        bkptRequest.enable();

        debuggeeCountField = targetClass.fieldByName("count");

        try {

            addListener (this);

        } catch (Exception ex){

            ex.printStackTrace();

            failure("failure: Could not add listener");

            throw new Exception("BreakpointTest: failed");

        }

        int prevBkptCount;

        vm().resume();

        while (!vmDisconnected && bkptCount < maxBkpts) {

            try {

                Thread.sleep(5000);

            } catch (InterruptedException ee) {

            }

        }

        println("done with loop, final count = " +

                    ((LongValue)targetClass.

                     getValue(debuggeeCountField)).value());

        bkptRequest.disable();

        removeListener(this);

        /*

         * deal with results of test

         * if anything has called failure("foo") testFailed will be true

         */

        if (!testFailed) {

            println("BreakpointTest: passed");

        } else {

            throw new Exception("BreakpointTest: failed");

        }

    }

}