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/*
* Copyright (c) 2001, 2015, 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 driver 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");
}
}
}
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