246 lines
9.3 KiB
Java
246 lines
9.3 KiB
Java
/*
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* Copyright (c) 2021 SAP SE. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 8274687
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* @summary Test the special handling in the JDWP agent of threads that call
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* j.l.Thread.resume().
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*
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* This is the sequence of actions by the debugger and the threads
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* "main" and "resumee" in the target vm.
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*
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* "resumee": Reaches breakpoint in methodWithBreakpoint() and is
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* suspended then.
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*
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* "main": Calls j.l.Thread.resume() for "resumee". There is an internal
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* breakpoint in Thread.resume() so the JDWP agent receives a
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* breakpoint event. It finds that "resumee" is suspended because
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* of JDWP actions. The resume() call would interfere with the
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* debugger therefore "main" is blocked.
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*
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* Debugger: Tests if the suspended "resumee" can be suspended a second
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* time and resumes it again.
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*
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* Debugger: Resumes "resumee" by calling ThreadReference.resume().
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* The JDWP agent notifies "main" about it.
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*
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* "resumee": Continues execution.
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*
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* "main": Receives the notification, finds that "resumee" is not
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* suspended anymore and continues execution.
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*
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* Debugger: Verifies that "main" is no longer blocked.
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*
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* @author Richard Reingruber richard DOT reingruber AT sap DOT com
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*
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* @library /test/lib
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*
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* @run build TestScaffold VMConnection TargetListener TargetAdapter
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* @run compile -g ResumeAfterThreadResumeCallTest.java
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* @run driver ResumeAfterThreadResumeCallTest
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*/
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import com.sun.jdi.*;
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import com.sun.jdi.event.*;
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import jdk.test.lib.Asserts;
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import java.util.*;
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// Target program for the debugger
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class ResumeAfterThreadResumeCallTarg extends Thread {
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public boolean reachedBreakpoint;
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public boolean mainThreadReturnedFromResumeCall;
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public boolean testFinished;
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public ResumeAfterThreadResumeCallTarg(String name) {
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super(name);
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}
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public static void log(String m) {
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String threadName = Thread.currentThread().getName();
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System.out.println("###(Target,"+ threadName +") " + m);
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}
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public static void main(String[] args) {
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log("Entered main()");
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// Start "resumee" thread.
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ResumeAfterThreadResumeCallTarg resumee = new ResumeAfterThreadResumeCallTarg("resumee");
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resumee.start();
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// Wait for "resumee" to reach the breakpoint in methodWithBreakpoint().
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while (!resumee.reachedBreakpoint) {
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try {
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Thread.sleep(100);
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} catch (InterruptedException e) { /* ignored */ }
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}
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// "resumee" is suspended now because of the breakpoint
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// Calling Thread.resume() will block this thread.
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log("Calling Thread.resume()");
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resumee.resume();
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resumee.mainThreadReturnedFromResumeCall = true;
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log("Thread.resume() returned");
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// Wait for debugger
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while (!resumee.testFinished) {
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try {
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Thread.sleep(100);
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} catch (InterruptedException e) { /* ignored */ }
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}
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}
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public void run() {
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log("up and running.");
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methodWithBreakpoint();
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}
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public void methodWithBreakpoint() {
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log("Entered methodWithBreakpoint()");
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}
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}
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// Debugger program
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public class ResumeAfterThreadResumeCallTest extends TestScaffold {
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public static final String TARGET_CLS_NAME = ResumeAfterThreadResumeCallTarg.class.getName();
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public static final long UNBLOCK_TIMEOUT = 10000;
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ResumeAfterThreadResumeCallTest (String args[]) {
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super(args);
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}
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public static void main(String[] args) throws Exception {
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new ResumeAfterThreadResumeCallTest(args).startTests();
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}
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/**
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* Set a breakpoint in the given method and resume all threads. The
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* breakpoint is configured to suspend just the thread that reaches it
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* instead of all threads.
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*/
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public BreakpointEvent resumeTo(String clsName, String methodName, String signature) {
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boolean suspendThreadOnly = true;
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return resumeTo(clsName, methodName, signature, suspendThreadOnly);
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}
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protected void runTests() throws Exception {
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BreakpointEvent bpe = startToMain(TARGET_CLS_NAME);
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mainThread = bpe.thread();
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log("Resuming to methodWithBreakpoint()");
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bpe = resumeTo(TARGET_CLS_NAME, "methodWithBreakpoint", "()V");
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log("Thread \"resumee\" has reached the breakpoint and is suspended now.");
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ThreadReference resumee = bpe.thread();
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ObjectReference resumeeThreadObj = resumee.frame(1).thisObject();
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printStack(resumee);
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mainThread.suspend();
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printStack(mainThread);
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mainThread.resume();
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log("resumee.isSuspended() -> " + resumee.isSuspended());
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log("mainThread.isSuspended() -> " + mainThread.isSuspended());
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log("Notify target main thread to continue by setting reachedBreakpoint = true.");
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setField(resumeeThreadObj, "reachedBreakpoint", vm().mirrorOf(true));
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log("Sleeping 500ms so that the main thread is blocked calling Thread.resume() on \"resumee\" Thread.");
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Thread.sleep(500);
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log("After sleep.");
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mainThread.suspend();
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printStack(mainThread);
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mainThread.resume();
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boolean mainThreadReturnedFromResumeCall = false;
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boolean resumedResumee = false;
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for (long sleepTime = 50; sleepTime < UNBLOCK_TIMEOUT && !mainThreadReturnedFromResumeCall; sleepTime <<= 1) {
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log("mainThread.isSuspended() -> " + mainThread.isSuspended());
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Value v = getField(resumeeThreadObj, "mainThreadReturnedFromResumeCall");
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mainThreadReturnedFromResumeCall = ((PrimitiveValue) v).booleanValue();
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if (!resumedResumee) {
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// main thread should still be blocked.
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Asserts.assertFalse(mainThreadReturnedFromResumeCall, "main Thread was not blocked");
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// Test suspending the already suspended resumee thread.
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Asserts.assertTrue(resumee.isSuspended(), "\"resumee\" is not suspended.");
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log("Check if suspended \"resumee\" can be suspended a 2nd time.");
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resumee.suspend();
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log("resumee.isSuspended() -> " + resumee.isSuspended());
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log("Resuming \"resumee\"");
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resumee.resume();
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Asserts.assertTrue(resumee.isSuspended(), "\"resumee\" is not suspended.");
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// Really resume the resumee thread.
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log("Resuming \"resumee\" a 2nd time will unblock the main thread.");
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resumee.resume();
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Asserts.assertFalse(resumee.isSuspended(), "\"resumee\" is still suspended.");
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resumedResumee = true;
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}
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log("Sleeping " + sleepTime + "ms");
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Thread.sleep(sleepTime);
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}
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Asserts.assertTrue(mainThreadReturnedFromResumeCall, "main Thread was not unblocked");
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setField(resumeeThreadObj, "testFinished", vm().mirrorOf(true));
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// Resume the target listening for events
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listenUntilVMDisconnect();
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}
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public void printStack(ThreadReference thread) throws Exception {
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log("Stack of thread '" + thread.name() + "':");
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List<StackFrame> stack_frames = thread.frames();
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int i = 0;
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for (StackFrame ff : stack_frames) {
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Location loc = ff.location();
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String locString = "bci:" + loc.codeIndex();
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try {
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locString = loc.sourceName() + ":" + loc.lineNumber() + "," + locString;
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} catch (AbsentInformationException e) {/* empty */};
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log(" frame[" + i++ +"]: " + ff.location().method() + " (" + locString + ")");
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}
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}
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public void setField(ObjectReference obj, String fName, Value val) throws Exception {
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log("set field " + fName + " = " + val);
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ReferenceType rt = obj.referenceType();
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Field fld = rt.fieldByName(fName);
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obj.setValue(fld, val);
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log("ok");
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}
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public Value getField(ObjectReference obj, String fName) throws Exception {
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log("get field " + fName);
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ReferenceType rt = obj.referenceType();
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Field fld = rt.fieldByName(fName);
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Value val = obj.getValue(fld);
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log("result : " + val);
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return val;
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}
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public void log(String m) {
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System.out.println("###(Debugger) " + m);
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}
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}
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