Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/runtime/Thread.java @ 18665:96861e3f8cc5
made CFGPrinterObserver reset (upon close) properly
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 11 Dec 2014 22:14:30 +0100 |
parents | bf8517f4e4d0 |
children |
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/* * Copyright (c) 2000, 2011, 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.runtime; import java.util.*; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.types.*; public class Thread extends VMObject { private static long tlabFieldOffset; private static CIntegerField suspendFlagsField; // Thread::SuspendFlags enum constants private static int EXTERNAL_SUSPEND; private static int EXT_SUSPENDED; private static int HAS_ASYNC_EXCEPTION; private static AddressField activeHandlesField; private static AddressField currentPendingMonitorField; private static AddressField currentWaitingMonitorField; static { VM.registerVMInitializedObserver(new Observer() { public void update(Observable o, Object data) { initialize(VM.getVM().getTypeDataBase()); } }); } private static synchronized void initialize(TypeDataBase db) { Type type = db.lookupType("Thread"); suspendFlagsField = type.getCIntegerField("_suspend_flags"); EXTERNAL_SUSPEND = db.lookupIntConstant("Thread::_external_suspend").intValue(); EXT_SUSPENDED = db.lookupIntConstant("Thread::_ext_suspended").intValue(); HAS_ASYNC_EXCEPTION = db.lookupIntConstant("Thread::_has_async_exception").intValue(); tlabFieldOffset = type.getField("_tlab").getOffset(); activeHandlesField = type.getAddressField("_active_handles"); currentPendingMonitorField = type.getAddressField("_current_pending_monitor"); currentWaitingMonitorField = type.getAddressField("_current_waiting_monitor"); } public Thread(Address addr) { super(addr); } public int suspendFlags() { return (int) suspendFlagsField.getValue(addr); } public boolean isExternalSuspend() { return (suspendFlags() & EXTERNAL_SUSPEND) != 0; } public boolean isExtSuspended() { return (suspendFlags() & EXT_SUSPENDED) != 0; } public boolean isBeingExtSuspended() { return isExtSuspended() || isExternalSuspend(); } // historical usage: checked for VM or external suspension public boolean isAnySuspended() { return isExtSuspended(); } public boolean hasAsyncException() { return (suspendFlags() & HAS_ASYNC_EXCEPTION) != 0; } public ThreadLocalAllocBuffer tlab() { return new ThreadLocalAllocBuffer(addr.addOffsetTo(tlabFieldOffset)); } public JNIHandleBlock activeHandles() { Address a = activeHandlesField.getAddress(addr); if (a == null) { return null; } return new JNIHandleBlock(a); } public boolean isVMThread() { return false; } public boolean isJavaThread() { return false; } public boolean isCompilerThread() { return false; } public boolean isHiddenFromExternalView() { return false; } public boolean isJvmtiAgentThread() { return false; } public boolean isWatcherThread() { return false; } public boolean isConcurrentMarkSweepThread() { return false; } public boolean isServiceThread() { return false; } /** Memory operations */ public void oopsDo(AddressVisitor oopVisitor) { // FIXME: Empty for now; will later traverse JNI handles and // pending exception } public ObjectMonitor getCurrentPendingMonitor() { Address monitorAddr = currentPendingMonitorField.getValue(addr); if (monitorAddr == null) { return null; } return new ObjectMonitor(monitorAddr); } public ObjectMonitor getCurrentWaitingMonitor() { Address monitorAddr = currentWaitingMonitorField.getValue(addr); if (monitorAddr == null) { return null; } return new ObjectMonitor(monitorAddr); } public boolean isLockOwned(Address lock) { if (isInStack(lock)) return true; return false; } public boolean isInStack(Address a) { // In the Serviceability Agent we need access to the thread's // stack pointer to be able to answer this question. Since it is // only a debugging system at the moment we need access to the // underlying thread, which is only present for Java threads; see // JavaThread.java. return false; } /** Assistance for ObjectMonitor implementation */ Address threadObjectAddress() { return addr; } }