Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/jdi/ThreadReferenceImpl.java @ 13339:3603fab248a6
added redundant move elimination as post-pass to LinearScan
author | Erik Eckstein <erik.eckstein@oracle.com> |
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date | Fri, 13 Dec 2013 07:56:25 +0100 |
parents | c18cbe5936b8 |
children |
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/* * Copyright (c) 2002, 2009, 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. * */ package sun.jvm.hotspot.jdi; import sun.jvm.hotspot.debugger.OopHandle; import sun.jvm.hotspot.runtime.VMObject; import sun.jvm.hotspot.runtime.JavaThread; import sun.jvm.hotspot.runtime.OSThread; //import sun.jvm.hotspot.runtime.StackFrameStream; import sun.jvm.hotspot.runtime.JavaVFrame; import sun.jvm.hotspot.runtime.JavaThreadState; import sun.jvm.hotspot.runtime.MonitorInfo; import sun.jvm.hotspot.runtime.ObjectMonitor; import sun.jvm.hotspot.oops.Oop; import sun.jvm.hotspot.oops.ObjectHeap; import sun.jvm.hotspot.oops.Instance; import sun.jvm.hotspot.oops.OopUtilities; import sun.jvm.hotspot.oops.Klass; import sun.jvm.hotspot.utilities.Assert; import com.sun.jdi.*; import java.util.*; public class ThreadReferenceImpl extends ObjectReferenceImpl implements ThreadReference, /* imports */ JVMTIThreadState { private JavaThread myJavaThread; private ArrayList frames; // StackFrames private List ownedMonitors; // List<ObjectReferenceImpl> private List ownedMonitorsInfo; // List<MonitorInfo> private ObjectReferenceImpl currentContendingMonitor; ThreadReferenceImpl(VirtualMachine aVm, sun.jvm.hotspot.runtime.JavaThread aRef) { // We are given a JavaThread and save it in our myJavaThread field. // But, our parent class is an ObjectReferenceImpl so we need an Oop // for it. JavaThread is a wrapper around a Thread Oop so we get // that Oop and give it to our super. // We can get it back again by calling ref(). super(aVm, (Instance)aRef.getThreadObj()); myJavaThread = aRef; } ThreadReferenceImpl(VirtualMachine vm, Instance oRef) { // Instance must be of type java.lang.Thread super(vm, oRef); // JavaThread retrieved from java.lang.Thread instance may be null. // This is the case for threads not-started and for zombies. Wherever // appropriate, check for null instead of resulting in NullPointerException. myJavaThread = OopUtilities.threadOopGetJavaThread(oRef); } // return value may be null. refer to the comment in constructor. JavaThread getJavaThread() { return myJavaThread; } protected String description() { return "ThreadReference " + uniqueID(); } /** * Note that we only cache the name string while suspended because * it can change via Thread.setName arbitrarily */ public String name() { return OopUtilities.threadOopGetName(ref()); } public void suspend() { vm.throwNotReadOnlyException("ThreadReference.suspend()"); } public void resume() { vm.throwNotReadOnlyException("ThreadReference.resume()"); } public int suspendCount() { // all threads are "suspended" when we attach to process or core. // we interpret this as one suspend. return 1; } public void stop(ObjectReference throwable) throws InvalidTypeException { vm.throwNotReadOnlyException("ThreadReference.stop()"); } public void interrupt() { vm.throwNotReadOnlyException("ThreadReference.interrupt()"); } // refer to jvmtiEnv::GetThreadState private int jvmtiGetThreadState() { // get most state bits int state = OopUtilities.threadOopGetThreadStatus(ref()); // add more state bits if (myJavaThread != null) { JavaThreadState jts = myJavaThread.getThreadState(); if (myJavaThread.isBeingExtSuspended()) { state |= JVMTI_THREAD_STATE_SUSPENDED; } if (jts == JavaThreadState.IN_NATIVE) { state |= JVMTI_THREAD_STATE_IN_NATIVE; } OSThread osThread = myJavaThread.getOSThread(); if (osThread != null && osThread.interrupted()) { state |= JVMTI_THREAD_STATE_INTERRUPTED; } } return state; } public int status() { int state = jvmtiGetThreadState(); int status = THREAD_STATUS_UNKNOWN; // refer to map2jdwpThreadStatus in util.c (back-end) if (! ((state & JVMTI_THREAD_STATE_ALIVE) != 0) ) { if ((state & JVMTI_THREAD_STATE_TERMINATED) != 0) { status = THREAD_STATUS_ZOMBIE; } else { status = THREAD_STATUS_NOT_STARTED; } } else { if ((state & JVMTI_THREAD_STATE_SLEEPING) != 0) { status = THREAD_STATUS_SLEEPING; } else if ((state & JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER) != 0) { status = THREAD_STATUS_MONITOR; } else if ((state & JVMTI_THREAD_STATE_WAITING) != 0) { status = THREAD_STATUS_WAIT; } else if ((state & JVMTI_THREAD_STATE_RUNNABLE) != 0) { status = THREAD_STATUS_RUNNING; } } return status; } public boolean isSuspended() { //fixme jjh // If we want to support doing this for a VM which was being // debugged, then we need to fix this. // In the meantime, we will say all threads are suspended, // otherwise, some things won't work, like the jdb 'up' cmd. return true; } public boolean isAtBreakpoint() { //fixme jjh // If we want to support doing this for a VM which was being // debugged, then we need to fix this. return false; } public ThreadGroupReference threadGroup() { return (ThreadGroupReferenceImpl)vm.threadGroupMirror( (Instance)OopUtilities.threadOopGetThreadGroup(ref())); } public int frameCount() throws IncompatibleThreadStateException { //fixme jjh privateFrames(0, -1); return frames.size(); } public List frames() throws IncompatibleThreadStateException { return privateFrames(0, -1); } public StackFrame frame(int index) throws IncompatibleThreadStateException { List list = privateFrames(index, 1); return (StackFrame)list.get(0); } public List frames(int start, int length) throws IncompatibleThreadStateException { if (length < 0) { throw new IndexOutOfBoundsException( "length must be greater than or equal to zero"); } return privateFrames(start, length); } /** * Private version of frames() allows "-1" to specify all * remaining frames. */ private List privateFrames(int start, int length) throws IncompatibleThreadStateException { if (myJavaThread == null) { // for zombies and yet-to-be-started threads we need to throw exception throw new IncompatibleThreadStateException(); } if (frames == null) { frames = new ArrayList(10); JavaVFrame myvf = myJavaThread.getLastJavaVFrameDbg(); while (myvf != null) { StackFrame myFrame = new StackFrameImpl(vm, this, myvf); //fixme jjh null should be a Location frames.add(myFrame); myvf = (JavaVFrame)myvf.javaSender(); } } List retVal; if (frames.size() == 0) { retVal = new ArrayList(0); } else { int toIndex = start + length; if (length == -1) { toIndex = frames.size(); } retVal = frames.subList(start, toIndex); } return Collections.unmodifiableList(retVal); } // refer to JvmtiEnvBase::get_owned_monitors public List ownedMonitors() throws IncompatibleThreadStateException { if (vm.canGetOwnedMonitorInfo() == false) { throw new UnsupportedOperationException(); } if (myJavaThread == null) { throw new IncompatibleThreadStateException(); } if (ownedMonitors != null) { return ownedMonitors; } ownedMonitorsWithStackDepth(); for (Iterator omi = ownedMonitorsInfo.iterator(); omi.hasNext(); ) { //FIXME : Change the MonitorInfoImpl cast to com.sun.jdi.MonitorInfo // when hotspot start building with jdk1.6. ownedMonitors.add(((MonitorInfoImpl)omi.next()).monitor()); } return ownedMonitors; } // new method since 1.6. // Real body will be supplied later. public List ownedMonitorsAndFrames() throws IncompatibleThreadStateException { if (!vm.canGetMonitorFrameInfo()) { throw new UnsupportedOperationException( "target does not support getting Monitor Frame Info"); } if (myJavaThread == null) { throw new IncompatibleThreadStateException(); } if (ownedMonitorsInfo != null) { return ownedMonitorsInfo; } ownedMonitorsWithStackDepth(); return ownedMonitorsInfo; } private void ownedMonitorsWithStackDepth() { ownedMonitorsInfo = new ArrayList(); List lockedObjects = new ArrayList(); // List<OopHandle> List stackDepth = new ArrayList(); // List<int> ObjectMonitor waitingMonitor = myJavaThread.getCurrentWaitingMonitor(); ObjectMonitor pendingMonitor = myJavaThread.getCurrentPendingMonitor(); OopHandle waitingObj = null; if (waitingMonitor != null) { // save object of current wait() call (if any) for later comparison waitingObj = waitingMonitor.object(); } OopHandle pendingObj = null; if (pendingMonitor != null) { // save object of current enter() call (if any) for later comparison pendingObj = pendingMonitor.object(); } JavaVFrame frame = myJavaThread.getLastJavaVFrameDbg(); int depth=0; while (frame != null) { List frameMonitors = frame.getMonitors(); // List<MonitorInfo> for (Iterator miItr = frameMonitors.iterator(); miItr.hasNext(); ) { sun.jvm.hotspot.runtime.MonitorInfo mi = (sun.jvm.hotspot.runtime.MonitorInfo) miItr.next(); if (mi.eliminated() && frame.isCompiledFrame()) { continue; // skip eliminated monitor } OopHandle obj = mi.owner(); if (obj == null) { // this monitor doesn't have an owning object so skip it continue; } if (obj.equals(waitingObj)) { // the thread is waiting on this monitor so it isn't really owned continue; } if (obj.equals(pendingObj)) { // the thread is pending on this monitor so it isn't really owned continue; } boolean found = false; for (Iterator loItr = lockedObjects.iterator(); loItr.hasNext(); ) { // check for recursive locks if (obj.equals(loItr.next())) { found = true; break; } } if (found) { // already have this object so don't include it continue; } // add the owning object to our list lockedObjects.add(obj); stackDepth.add(new Integer(depth)); } frame = (JavaVFrame) frame.javaSender(); depth++; } // now convert List<OopHandle> to List<ObjectReference> ObjectHeap heap = vm.saObjectHeap(); Iterator stk = stackDepth.iterator(); for (Iterator loItr = lockedObjects.iterator(); loItr.hasNext(); ) { Oop obj = heap.newOop((OopHandle)loItr.next()); ownedMonitorsInfo.add(new MonitorInfoImpl(vm, vm.objectMirror(obj), this, ((Integer)stk.next()).intValue())); } } // refer to JvmtiEnvBase::get_current_contended_monitor public ObjectReference currentContendedMonitor() throws IncompatibleThreadStateException { if (vm.canGetCurrentContendedMonitor() == false) { throw new UnsupportedOperationException(); } if (myJavaThread == null) { throw new IncompatibleThreadStateException(); } ObjectMonitor mon = myJavaThread.getCurrentWaitingMonitor(); if (mon == null) { // thread is not doing an Object.wait() call mon = myJavaThread.getCurrentPendingMonitor(); if (mon != null) { OopHandle handle = mon.object(); // If obj == NULL, then ObjectMonitor is raw which doesn't count // as contended for this API return vm.objectMirror(vm.saObjectHeap().newOop(handle)); } else { // no contended ObjectMonitor return null; } } else { // thread is doing an Object.wait() call OopHandle handle = mon.object(); if (Assert.ASSERTS_ENABLED) { Assert.that(handle != null, "Object.wait() should have an object"); } Oop obj = vm.saObjectHeap().newOop(handle); return vm.objectMirror(obj); } } public void popFrames(StackFrame frame) throws IncompatibleThreadStateException { vm.throwNotReadOnlyException("ThreadReference.popFrames()"); } public void forceEarlyReturn(Value returnValue) throws IncompatibleThreadStateException { vm.throwNotReadOnlyException("ThreadReference.forceEarlyReturn()"); } public String toString() { return "instance of " + referenceType().name() + "(name='" + name() + "', " + "id=" + uniqueID() + ")"; } }