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 * You should have received a copy of the GNU General Public License version

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 *

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 */

/**

 *  @test

 *  @bug 4272800 4274208 4392010

 *  @summary Test debugger operations in finalize() methods

 *  @author Gordon Hirsch  (modified for HotSpot by tbell & rfield)

 *

 *  @run build TestScaffold VMConnection TargetListener TargetAdapter

 *  @run compile -g FinalizerTest.java

 *

 *  @run driver FinalizerTest

 */

import com.sun.jdi.*;

import com.sun.jdi.event.*;

import com.sun.jdi.request.*;

import java.util.List;

import java.util.ArrayList;

import java.util.Iterator;

/*

 * Debuggee which exercises a finalize() method. There's no guarantee

 * that this will work, but we need some way of attempting to test

 * the debugging of finalizers.

 * @author Gordon Hirsch  (modified for HotSpot by tbell & rfield)

 */

class FinalizerTarg {

    static String lockit = "lock";

    static boolean finalizerRun = false;

    static class BigObject {

        String name;

        byte[] foo = new byte[300000];

        public BigObject (String _name) {

            super();

            this.name = _name;

        }

        protected void finalize() throws Throwable {

            /*

             * JLS 2nd Ed. section 12.6 "Finalization of Class Instances" "[...]

             * invoke the finalize method for its superclass, [...] usually good

             * practice [...]"

             */

            super.finalize();

            //Thread.dumpStack();

            finalizerRun = true;

        }

    }

    static void waitForAFinalizer() {

        String s = Integer.toString(1);

        BigObject b = new BigObject (s);

        b = null; // Drop the object, creating garbage...

        System.gc();

        System.runFinalization();

        // Now, we have to make sure the finalizer

        // gets run.  We will keep allocating more

        // and more memory with the idea that eventually,

        // the memory occupied by the BigObject will get reclaimed

        // and the finalizer will be run.

        List holdAlot = new ArrayList();

        for (int chunk=10000000; chunk > 10000; chunk = chunk / 2) {

            if (finalizerRun) {

                return;

            }

            try {

                while(true) {

                    holdAlot.add(new byte[chunk]);

                    System.err.println("Allocated " + chunk);

                }

            }

            catch ( Throwable thrown ) {  // OutOfMemoryError

                System.gc();

            }

            System.runFinalization();

        }

        return;  // not reached

    }

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

        /*

         * Spin in waitForAFinalizer() while waiting for

         * another thread to run the finalizer on one of the

         * BigObjects ...

         */

        waitForAFinalizer();

    }

}

///// End of debuggee

public class FinalizerTest extends TestScaffold {

    public static void main(String args[])

        throws Exception {

        new FinalizerTest (args).startTests();

    }

    public FinalizerTest (String args[]) {

        super(args);

    }

    protected void runTests() throws Exception {

        try {

            BreakpointEvent event0 = startToMain("FinalizerTarg");

            BreakpointEvent event1 = resumeTo("FinalizerTarg$BigObject",

                                              "finalize", "()V");

            println("Breakpoint at " +

                    event1.location().method().name() + ":" +

                    event1.location().lineNumber() + " (" +

                    event1.location().codeIndex() + ")");

            /*

             * Record information about the current location

             */

            List frames = event1.thread().frames();

            List methodStack = new ArrayList(frames.size());

            Iterator iter = frames.iterator();

            while (iter.hasNext()) {

                StackFrame frame = (StackFrame) iter.next();

                methodStack.add(frame.location().declaringType().name() +

                                "." + frame.location().method().name());

            }

            println("Try a stepOverLine()...");

            StepEvent stepEvent = stepOverLine(event1.thread());

            println("Step Complete at " +

                               stepEvent.location().method().name() + ":" +

                               stepEvent.location().lineNumber() + " (" +

                               stepEvent.location().codeIndex() + ")");

            /*

             * Compare current location with recorded location

             */

            if (stepEvent.thread().frameCount() != methodStack.size()) {

                throw new Exception("Stack depths do not match: original=" +

                                    methodStack.size() +

                                    ", current=" +

                                    stepEvent.thread().frameCount());

            }

            iter = stepEvent.thread().frames().iterator();

            Iterator iter2 = methodStack.iterator();

            while (iter.hasNext()) {

                StackFrame frame = (StackFrame) iter.next();

                String name = (String) iter2.next();

                String currentName = frame.location().declaringType().name() +

                "." + frame.location().method().name();

                if (!name.equals(currentName)) {

                    throw new Exception("Stacks do not match at: original=" +

                                         name + ", current=" + currentName);

                }

            }

        } catch(Exception ex) {

            ex.printStackTrace();

            testFailed = true;

        } finally {

            // Allow application to complete and shut down

            listenUntilVMDisconnect();

        }

        if (!testFailed) {

            println("FinalizerTest: passed");

        } else {

            throw new Exception("FinalizerTest: failed");

        }

    }

}