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/*
* Copyright (c) 2024, 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 8333542
* @summary Missed breakpoint due to JVM not blocking other threads while
* delivering a ClassPrepareEvent.
*
* @run build TestScaffold VMConnection TargetListener TargetAdapter
* @run compile -g BreakpointOnClassPrepare.java
* @run driver BreakpointOnClassPrepare SUSPEND_NONE
* @run driver BreakpointOnClassPrepare SUSPEND_EVENT_THREAD
* @run driver BreakpointOnClassPrepare SUSPEND_ALL
*/
import com.sun.jdi.*;
import com.sun.jdi.event.*;
import com.sun.jdi.request.*;
import java.util.*;
// The debuggee spawns 50 threads that call LoadedClass.foo(). The debugger enables
// ClassPrepareEvent for LoadedClass, and sets a breakpoint on LoadedClass.foo() when
// the ClassPrepareEvent arrives. The debugger expects 50 breakpoints to be hit.
// This verifies that the thread that causes the generation of the ClassPrepareEvent
// has properly blocked all other threads from executing LoadedClass.foo() until the
// ClassPrepareEvent has been delivered.
class LoadedClass {
static void foo(int k) {
System.out.println("HIT = " + k); // set breakpoint here
}
}
class BreakpointOnClassPrepareTarg {
public static void main(String[] args) throws InterruptedException {
System.out.println("Start");
Thread threads[] = new Thread[BreakpointOnClassPrepare.NUM_BREAKPOINTS];
for (int i = 0; i < BreakpointOnClassPrepare.NUM_BREAKPOINTS; i++) {
int k = i;
Thread t = DebuggeeWrapper.newThread(() -> {
System.out.println("k = " + k);
LoadedClass.foo(k);
});
threads[i] = t;
t.setDaemon(true);
t.setName("MyThread-" + k);
t.start();
}
for (int i = 0; i < BreakpointOnClassPrepare.NUM_BREAKPOINTS; i++) {
try {
Thread t = threads[i];
t.join();
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
System.out.println("Finish");
}
}
/********** test program **********/
public class BreakpointOnClassPrepare extends TestScaffold {
ClassType targetClass;
ThreadReference mainThread;
BreakpointOnClassPrepare(String args[]) {
super(args);
}
public static void main(String[] args) throws Exception {
new BreakpointOnClassPrepare(args).startTests();
}
/********** event handlers **********/
static final int NUM_BREAKPOINTS = 50;
int bkptCount;
BreakpointRequest bkptRequest;
public void breakpointReached(BreakpointEvent event) {
bkptCount++;
String threadInfo;
try {
threadInfo = event.thread().toString();
} catch (ObjectCollectedException e) {
// It's possible the Thread already terminated and was collected
// if the SUSPEND_NONE policy was used.
threadInfo = "(thread collected)";
}
System.out.println("Got BreakpointEvent: " + bkptCount + " for thread " + threadInfo);
}
public void vmDisconnected(VMDisconnectEvent event) {
println("Got VMDisconnectEvent");
}
/********** test core **********/
protected void runTests() throws Exception {
/* Determine which suspend policy to use. */
int policy;
if (args.length != 1) {
throw new RuntimeException("Invalid number of args: " + args.length);
}
String policyString = args[0];
if (policyString.equals("SUSPEND_NONE")) {
policy = EventRequest.SUSPEND_NONE;
} else if (policyString.equals("SUSPEND_ALL")) {
policy = EventRequest.SUSPEND_ALL;
} else if (policyString.equals("SUSPEND_EVENT_THREAD")) {
policy = EventRequest.SUSPEND_EVENT_THREAD;
} else {
throw new RuntimeException("Invalid suspend policy: " + policyString);
}
/* Stop when the target is loaded. */
BreakpointEvent bpe = startToMain("BreakpointOnClassPrepareTarg");
/* Stop when "LoadedClass" is loaded. */
EventRequestManager erm = vm().eventRequestManager();
ClassPrepareEvent cpe = resumeToPrepareOf("LoadedClass");
println("Got ClassPrepareEvent: " + cpe);
/* Set a breakpoint for each time LoadedClass.foo() is called. */
ClassType loadedClass = (ClassType)cpe.referenceType() ;
Location loc1 = findMethodLocation(loadedClass, "foo", "(I)V", 1);
bkptRequest = erm.createBreakpointRequest(loc1);
bkptRequest.setSuspendPolicy(policy);
bkptRequest.enable();
listenUntilVMDisconnect();
if (!testFailed && bkptCount == NUM_BREAKPOINTS) {
println("BreakpointOnClassPrepare: passed");
} else {
throw new Exception("BreakpointOnClassPrepare: failed. bkptCount == " + bkptCount);
}
}
}
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