645 lines
25 KiB
Java
645 lines
25 KiB
Java
/*
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* Copyright (c) 1998, 2017, Oracle and/or its affiliates. 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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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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package com.sun.tools.jdi;
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import com.sun.jdi.*;
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import com.sun.jdi.request.BreakpointRequest;
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import java.util.*;
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import java.lang.ref.WeakReference;
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public class ThreadReferenceImpl extends ObjectReferenceImpl
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implements ThreadReference, VMListener {
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static final int SUSPEND_STATUS_SUSPENDED = 0x1;
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static final int SUSPEND_STATUS_BREAK = 0x2;
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private int suspendedZombieCount = 0;
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/*
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* Some objects can only be created while a thread is suspended and are valid
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* only while the thread remains suspended. Examples are StackFrameImpl
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* and MonitorInfoImpl. When the thread resumes, these objects have to be
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* marked as invalid so that their methods can throw
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* InvalidStackFrameException if they are called. To do this, such objects
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* register themselves as listeners of the associated thread. When the
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* thread is resumed, its listeners are notified and mark themselves
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* invalid.
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* Also, note that ThreadReferenceImpl itself caches some info that
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* is valid only as long as the thread is suspended. When the thread
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* is resumed, that cache must be purged.
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* Lastly, note that ThreadReferenceImpl and its super, ObjectReferenceImpl
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* cache some info that is only valid as long as the entire VM is suspended.
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* If _any_ thread is resumed, this cache must be purged. To handle this,
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* both ThreadReferenceImpl and ObjectReferenceImpl register themselves as
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* VMListeners so that they get notified when all threads are suspended and
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* when any thread is resumed.
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*/
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// This is cached for the life of the thread
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private ThreadGroupReference threadGroup;
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// This is cached only while this one thread is suspended. Each time
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// the thread is resumed, we abandon the current cache object and
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// create a new initialized one.
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private static class LocalCache {
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JDWP.ThreadReference.Status status = null;
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List<StackFrame> frames = null;
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int framesStart = -1;
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int framesLength = 0;
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int frameCount = -1;
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List<ObjectReference> ownedMonitors = null;
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List<MonitorInfo> ownedMonitorsInfo = null;
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ObjectReference contendedMonitor = null;
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boolean triedCurrentContended = false;
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}
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/*
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* The localCache instance var is set by resetLocalCache to an initialized
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* object as shown above. This occurs when the ThreadReference
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* object is created, and when the mirrored thread is resumed.
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* The fields are then filled in by the relevant methods as they
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* are called. A problem can occur if resetLocalCache is called
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* (ie, a resume() is executed) at certain points in the execution
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* of some of these methods - see 6751643. To avoid this, each
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* method that wants to use this cache must make a local copy of
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* this variable and use that. This means that each invocation of
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* these methods will use a copy of the cache object that was in
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* effect at the point that the copy was made; if a racy resume
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* occurs, it won't affect the method's local copy. This means that
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* the values returned by these calls may not match the state of
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* the debuggee at the time the caller gets the values. EG,
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* frameCount() is called and comes up with 5 frames. But before
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* it returns this, a resume of the debuggee thread is executed in a
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* different debugger thread. The thread is resumed and running at
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* the time that the value 5 is returned. Or even worse, the thread
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* could be suspended again and have a different number of frames, eg, 24,
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* but this call will still return 5.
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*/
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private LocalCache localCache;
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private void resetLocalCache() {
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localCache = new LocalCache();
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}
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// This is cached only while all threads in the VM are suspended
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// Yes, someone could change the name of a thread while it is suspended.
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private static class Cache extends ObjectReferenceImpl.Cache {
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String name = null;
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}
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protected ObjectReferenceImpl.Cache newCache() {
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return new Cache();
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}
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// Listeners - synchronized on vm.state()
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private List<WeakReference<ThreadListener>> listeners = new ArrayList<WeakReference<ThreadListener>>();
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ThreadReferenceImpl(VirtualMachine aVm, long aRef) {
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super(aVm,aRef);
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resetLocalCache();
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vm.state().addListener(this);
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}
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protected String description() {
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return "ThreadReference " + uniqueID();
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}
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/*
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* VMListener implementation
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*/
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public boolean vmNotSuspended(VMAction action) {
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if (action.resumingThread() == null) {
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// all threads are being resumed
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synchronized (vm.state()) {
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processThreadAction(new ThreadAction(this,
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ThreadAction.THREAD_RESUMABLE));
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}
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}
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/*
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* Othewise, only one thread is being resumed:
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* if it is us,
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* we have already done our processThreadAction to notify our
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* listeners when we processed the resume.
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* if it is not us,
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* we don't want to notify our listeners
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* because we are not being resumed.
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*/
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return super.vmNotSuspended(action);
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}
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/**
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* Note that we only cache the name string while the entire VM is suspended
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* because the name can change via Thread.setName arbitrarily while this
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* thread is running.
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*/
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public String name() {
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String name = null;
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try {
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Cache local = (Cache)getCache();
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if (local != null) {
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name = local.name;
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}
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if (name == null) {
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name = JDWP.ThreadReference.Name.process(vm, this)
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.threadName;
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if (local != null) {
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local.name = name;
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}
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}
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} catch (JDWPException exc) {
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throw exc.toJDIException();
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}
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return name;
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}
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/*
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* Sends a command to the back end which is defined to do an
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* implicit vm-wide resume.
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*/
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PacketStream sendResumingCommand(CommandSender sender) {
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synchronized (vm.state()) {
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processThreadAction(new ThreadAction(this,
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ThreadAction.THREAD_RESUMABLE));
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return sender.send();
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}
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}
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public void suspend() {
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try {
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JDWP.ThreadReference.Suspend.process(vm, this);
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} catch (JDWPException exc) {
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throw exc.toJDIException();
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}
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// Don't consider the thread suspended yet. On reply, notifySuspend()
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// will be called.
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}
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public void resume() {
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/*
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* If it's a zombie, we can just update internal state without
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* going to back end.
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*/
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if (suspendedZombieCount > 0) {
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suspendedZombieCount--;
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return;
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}
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PacketStream stream;
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synchronized (vm.state()) {
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processThreadAction(new ThreadAction(this,
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ThreadAction.THREAD_RESUMABLE));
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stream = JDWP.ThreadReference.Resume.enqueueCommand(vm, this);
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}
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try {
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JDWP.ThreadReference.Resume.waitForReply(vm, stream);
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} catch (JDWPException exc) {
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throw exc.toJDIException();
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}
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}
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public int suspendCount() {
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/*
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* If it's a zombie, we maintain the count in the front end.
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*/
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if (suspendedZombieCount > 0) {
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return suspendedZombieCount;
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}
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try {
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return JDWP.ThreadReference.SuspendCount.process(vm, this).suspendCount;
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} catch (JDWPException exc) {
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throw exc.toJDIException();
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}
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}
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public void stop(ObjectReference throwable) throws InvalidTypeException {
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validateMirrorOrNull(throwable);
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// Verify that the given object is a Throwable instance
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List<ReferenceType> list = vm.classesByName("java.lang.Throwable");
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ClassTypeImpl throwableClass = (ClassTypeImpl)list.get(0);
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if ((throwable == null) ||
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!throwableClass.isAssignableFrom(throwable)) {
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throw new InvalidTypeException("Not an instance of Throwable");
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}
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try {
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JDWP.ThreadReference.Stop.process(vm, this,
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(ObjectReferenceImpl)throwable);
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} catch (JDWPException exc) {
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throw exc.toJDIException();
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}
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}
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public void interrupt() {
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try {
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JDWP.ThreadReference.Interrupt.process(vm, this);
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} catch (JDWPException exc) {
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throw exc.toJDIException();
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}
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}
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private JDWP.ThreadReference.Status jdwpStatus() {
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LocalCache snapshot = localCache;
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JDWP.ThreadReference.Status myStatus = snapshot.status;
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try {
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if (myStatus == null) {
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myStatus = JDWP.ThreadReference.Status.process(vm, this);
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if ((myStatus.suspendStatus & SUSPEND_STATUS_SUSPENDED) != 0) {
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// thread is suspended, we can cache the status.
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snapshot.status = myStatus;
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}
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}
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} catch (JDWPException exc) {
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throw exc.toJDIException();
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}
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return myStatus;
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}
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public int status() {
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return jdwpStatus().threadStatus;
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}
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public boolean isSuspended() {
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return ((suspendedZombieCount > 0) ||
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((jdwpStatus().suspendStatus & SUSPEND_STATUS_SUSPENDED) != 0));
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}
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public boolean isAtBreakpoint() {
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/*
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* TO DO: This fails to take filters into account.
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*/
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try {
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StackFrame frame = frame(0);
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Location location = frame.location();
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List<BreakpointRequest> requests = vm.eventRequestManager().breakpointRequests();
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Iterator<BreakpointRequest> iter = requests.iterator();
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while (iter.hasNext()) {
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BreakpointRequest request = iter.next();
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if (location.equals(request.location())) {
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return true;
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}
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}
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return false;
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} catch (IndexOutOfBoundsException iobe) {
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return false; // no frames on stack => not at breakpoint
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} catch (IncompatibleThreadStateException itse) {
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// Per the javadoc, not suspended => return false
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return false;
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}
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}
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public ThreadGroupReference threadGroup() {
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/*
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* Thread group can't change, so it's cached once and for all.
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*/
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if (threadGroup == null) {
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try {
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threadGroup = JDWP.ThreadReference.ThreadGroup.
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process(vm, this).group;
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} catch (JDWPException exc) {
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throw exc.toJDIException();
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}
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}
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return threadGroup;
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}
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public int frameCount() throws IncompatibleThreadStateException {
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LocalCache snapshot = localCache;
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try {
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if (snapshot.frameCount == -1) {
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snapshot.frameCount = JDWP.ThreadReference.FrameCount
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.process(vm, this).frameCount;
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}
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} catch (JDWPException exc) {
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switch (exc.errorCode()) {
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case JDWP.Error.THREAD_NOT_SUSPENDED:
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case JDWP.Error.INVALID_THREAD: /* zombie */
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throw new IncompatibleThreadStateException();
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default:
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throw exc.toJDIException();
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}
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}
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return snapshot.frameCount;
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}
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public List<StackFrame> frames() throws IncompatibleThreadStateException {
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return privateFrames(0, -1);
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}
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public StackFrame frame(int index) throws IncompatibleThreadStateException {
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List<StackFrame> list = privateFrames(index, 1);
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return list.get(0);
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}
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/**
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* Is the requested subrange within what has been retrieved?
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* local is known to be non-null. Should only be called from
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* a sync method.
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*/
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private boolean isSubrange(LocalCache snapshot,
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int start, int length) {
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if (start < snapshot.framesStart) {
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return false;
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}
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if (length == -1) {
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return (snapshot.framesLength == -1);
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}
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if (snapshot.framesLength == -1) {
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if ((start + length) > (snapshot.framesStart +
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snapshot.frames.size())) {
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throw new IndexOutOfBoundsException();
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}
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return true;
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}
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return ((start + length) <= (snapshot.framesStart + snapshot.framesLength));
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}
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public List<StackFrame> frames(int start, int length)
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throws IncompatibleThreadStateException {
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if (length < 0) {
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throw new IndexOutOfBoundsException(
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"length must be greater than or equal to zero");
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}
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return privateFrames(start, length);
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}
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/**
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* Private version of frames() allows "-1" to specify all
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* remaining frames.
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*/
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synchronized private List<StackFrame> privateFrames(int start, int length)
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throws IncompatibleThreadStateException {
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// Lock must be held while creating stack frames so if that two threads
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// do this at the same time, one won't clobber the subset created by the other.
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LocalCache snapshot = localCache;
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try {
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if (snapshot.frames == null || !isSubrange(snapshot, start, length)) {
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JDWP.ThreadReference.Frames.Frame[] jdwpFrames
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= JDWP.ThreadReference.Frames.
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process(vm, this, start, length).frames;
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int count = jdwpFrames.length;
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snapshot.frames = new ArrayList<StackFrame>(count);
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for (int i = 0; i<count; i++) {
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if (jdwpFrames[i].location == null) {
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throw new InternalException("Invalid frame location");
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}
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StackFrame frame = new StackFrameImpl(vm, this,
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jdwpFrames[i].frameID,
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jdwpFrames[i].location);
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// Add to the frame list
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snapshot.frames.add(frame);
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}
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snapshot.framesStart = start;
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snapshot.framesLength = length;
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return Collections.unmodifiableList(snapshot.frames);
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} else {
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int fromIndex = start - snapshot.framesStart;
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int toIndex;
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if (length == -1) {
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toIndex = snapshot.frames.size() - fromIndex;
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} else {
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toIndex = fromIndex + length;
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}
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return Collections.unmodifiableList(snapshot.frames.subList(fromIndex, toIndex));
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}
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} catch (JDWPException exc) {
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switch (exc.errorCode()) {
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case JDWP.Error.THREAD_NOT_SUSPENDED:
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case JDWP.Error.INVALID_THREAD: /* zombie */
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throw new IncompatibleThreadStateException();
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default:
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throw exc.toJDIException();
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}
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}
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}
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public List<ObjectReference> ownedMonitors() throws IncompatibleThreadStateException {
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LocalCache snapshot = localCache;
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try {
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if (snapshot.ownedMonitors == null) {
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snapshot.ownedMonitors = Arrays.asList(
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(ObjectReference[])JDWP.ThreadReference.OwnedMonitors.
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process(vm, this).owned);
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if ((vm.traceFlags & VirtualMachine.TRACE_OBJREFS) != 0) {
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vm.printTrace(description() +
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" temporarily caching owned monitors"+
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" (count = " + snapshot.ownedMonitors.size() + ")");
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}
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}
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} catch (JDWPException exc) {
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switch (exc.errorCode()) {
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case JDWP.Error.THREAD_NOT_SUSPENDED:
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case JDWP.Error.INVALID_THREAD: /* zombie */
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throw new IncompatibleThreadStateException();
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default:
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throw exc.toJDIException();
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}
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}
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return snapshot.ownedMonitors;
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}
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public ObjectReference currentContendedMonitor()
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throws IncompatibleThreadStateException {
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LocalCache snapshot = localCache;
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try {
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if (snapshot.contendedMonitor == null &&
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!snapshot.triedCurrentContended) {
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snapshot.contendedMonitor = JDWP.ThreadReference.CurrentContendedMonitor.
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process(vm, this).monitor;
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snapshot.triedCurrentContended = true;
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if ((snapshot.contendedMonitor != null) &&
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((vm.traceFlags & VirtualMachine.TRACE_OBJREFS) != 0)) {
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vm.printTrace(description() +
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" temporarily caching contended monitor"+
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" (id = " + snapshot.contendedMonitor.uniqueID() + ")");
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}
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}
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} catch (JDWPException exc) {
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switch (exc.errorCode()) {
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case JDWP.Error.THREAD_NOT_SUSPENDED:
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case JDWP.Error.INVALID_THREAD: /* zombie */
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throw new IncompatibleThreadStateException();
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default:
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throw exc.toJDIException();
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}
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}
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return snapshot.contendedMonitor;
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}
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public List<MonitorInfo> ownedMonitorsAndFrames() throws IncompatibleThreadStateException {
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LocalCache snapshot = localCache;
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try {
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if (snapshot.ownedMonitorsInfo == null) {
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JDWP.ThreadReference.OwnedMonitorsStackDepthInfo.monitor[] minfo;
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minfo = JDWP.ThreadReference.OwnedMonitorsStackDepthInfo.process(vm, this).owned;
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snapshot.ownedMonitorsInfo = new ArrayList<MonitorInfo>(minfo.length);
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for (int i=0; i < minfo.length; i++) {
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JDWP.ThreadReference.OwnedMonitorsStackDepthInfo.monitor mi =
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minfo[i];
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MonitorInfo mon = new MonitorInfoImpl(vm, minfo[i].monitor, this, minfo[i].stack_depth);
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snapshot.ownedMonitorsInfo.add(mon);
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}
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if ((vm.traceFlags & VirtualMachine.TRACE_OBJREFS) != 0) {
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vm.printTrace(description() +
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" temporarily caching owned monitors"+
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" (count = " + snapshot.ownedMonitorsInfo.size() + ")");
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}
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}
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} catch (JDWPException exc) {
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switch (exc.errorCode()) {
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case JDWP.Error.THREAD_NOT_SUSPENDED:
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case JDWP.Error.INVALID_THREAD: /* zombie */
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throw new IncompatibleThreadStateException();
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default:
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throw exc.toJDIException();
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}
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}
|
|
return snapshot.ownedMonitorsInfo;
|
|
}
|
|
|
|
public void popFrames(StackFrame frame) throws IncompatibleThreadStateException {
|
|
// Note that interface-wise this functionality belongs
|
|
// here in ThreadReference, but implementation-wise it
|
|
// belongs in StackFrame, so we just forward it.
|
|
if (!frame.thread().equals(this)) {
|
|
throw new IllegalArgumentException("frame does not belong to this thread");
|
|
}
|
|
if (!vm.canPopFrames()) {
|
|
throw new UnsupportedOperationException(
|
|
"target does not support popping frames");
|
|
}
|
|
((StackFrameImpl)frame).pop();
|
|
}
|
|
|
|
public void forceEarlyReturn(Value returnValue) throws InvalidTypeException,
|
|
ClassNotLoadedException,
|
|
IncompatibleThreadStateException {
|
|
if (!vm.canForceEarlyReturn()) {
|
|
throw new UnsupportedOperationException(
|
|
"target does not support the forcing of a method to return early");
|
|
}
|
|
|
|
validateMirrorOrNull(returnValue);
|
|
|
|
StackFrameImpl sf;
|
|
try {
|
|
sf = (StackFrameImpl)frame(0);
|
|
} catch (IndexOutOfBoundsException exc) {
|
|
throw new InvalidStackFrameException("No more frames on the stack");
|
|
}
|
|
sf.validateStackFrame();
|
|
MethodImpl meth = (MethodImpl)sf.location().method();
|
|
ValueImpl convertedValue = ValueImpl.prepareForAssignment(returnValue,
|
|
meth.getReturnValueContainer());
|
|
|
|
try {
|
|
JDWP.ThreadReference.ForceEarlyReturn.process(vm, this, convertedValue);
|
|
} catch (JDWPException exc) {
|
|
switch (exc.errorCode()) {
|
|
case JDWP.Error.OPAQUE_FRAME:
|
|
throw new NativeMethodException();
|
|
case JDWP.Error.THREAD_NOT_SUSPENDED:
|
|
throw new IncompatibleThreadStateException(
|
|
"Thread not suspended");
|
|
case JDWP.Error.THREAD_NOT_ALIVE:
|
|
throw new IncompatibleThreadStateException(
|
|
"Thread has not started or has finished");
|
|
case JDWP.Error.NO_MORE_FRAMES:
|
|
throw new InvalidStackFrameException(
|
|
"No more frames on the stack");
|
|
default:
|
|
throw exc.toJDIException();
|
|
}
|
|
}
|
|
}
|
|
|
|
public String toString() {
|
|
return "instance of " + referenceType().name() +
|
|
"(name='" + name() + "', " + "id=" + uniqueID() + ")";
|
|
}
|
|
|
|
byte typeValueKey() {
|
|
return JDWP.Tag.THREAD;
|
|
}
|
|
|
|
void addListener(ThreadListener listener) {
|
|
synchronized (vm.state()) {
|
|
listeners.add(new WeakReference<ThreadListener>(listener));
|
|
}
|
|
}
|
|
|
|
void removeListener(ThreadListener listener) {
|
|
synchronized (vm.state()) {
|
|
Iterator<WeakReference<ThreadListener>> iter = listeners.iterator();
|
|
while (iter.hasNext()) {
|
|
WeakReference<ThreadListener> ref = iter.next();
|
|
if (listener.equals(ref.get())) {
|
|
iter.remove();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Propagate the the thread state change information
|
|
* to registered listeners.
|
|
* Must be entered while synchronized on vm.state()
|
|
*/
|
|
private void processThreadAction(ThreadAction action) {
|
|
synchronized (vm.state()) {
|
|
Iterator<WeakReference<ThreadListener>> iter = listeners.iterator();
|
|
while (iter.hasNext()) {
|
|
WeakReference<ThreadListener> ref = iter.next();
|
|
ThreadListener listener = ref.get();
|
|
if (listener != null) {
|
|
switch (action.id()) {
|
|
case ThreadAction.THREAD_RESUMABLE:
|
|
if (!listener.threadResumable(action)) {
|
|
iter.remove();
|
|
}
|
|
break;
|
|
}
|
|
} else {
|
|
// Listener is unreachable; clean up
|
|
iter.remove();
|
|
}
|
|
}
|
|
|
|
// Discard our local cache
|
|
resetLocalCache();
|
|
}
|
|
}
|
|
}
|