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/*
* Copyright (c) 1999, 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 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");
}
}
}
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