author | erikj |
Tue, 12 Sep 2017 19:03:39 +0200 | |
changeset 47216 | 71c04702a3d5 |
parent 35217 | hotspot/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/runtime/ObjectMonitor.java@ce4b5303a813 |
child 54609 | 04857e2cd509 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2014, 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. |
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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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package sun.jvm.hotspot.runtime; |
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import java.util.*; |
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import sun.jvm.hotspot.debugger.*; |
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import sun.jvm.hotspot.oops.*; |
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import sun.jvm.hotspot.types.*; |
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public class ObjectMonitor extends VMObject { |
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static { |
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VM.registerVMInitializedObserver(new Observer() { |
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public void update(Observable o, Object data) { |
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initialize(VM.getVM().getTypeDataBase()); |
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} |
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}); |
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} |
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private static synchronized void initialize(TypeDataBase db) throws WrongTypeException { |
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heap = VM.getVM().getObjectHeap(); |
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Type type = db.lookupType("ObjectMonitor"); |
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sun.jvm.hotspot.types.Field f = type.getField("_header"); |
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headerFieldOffset = f.getOffset(); |
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f = type.getField("_object"); |
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objectFieldOffset = f.getOffset(); |
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f = type.getField("_owner"); |
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ownerFieldOffset = f.getOffset(); |
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f = type.getField("FreeNext"); |
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FreeNextFieldOffset = f.getOffset(); |
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countField = type.getJIntField("_count"); |
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waitersField = type.getJIntField("_waiters"); |
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recursionsField = type.getCIntegerField("_recursions"); |
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} |
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public ObjectMonitor(Address addr) { |
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super(addr); |
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} |
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public Mark header() { |
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return new Mark(addr.addOffsetTo(headerFieldOffset)); |
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} |
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// FIXME |
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// void set_header(markOop hdr); |
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// FIXME: must implement and delegate to platform-dependent implementation |
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// public boolean isBusy(); |
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public boolean isEntered(sun.jvm.hotspot.runtime.Thread current) { |
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Address o = owner(); |
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if (current.threadObjectAddress().equals(o) || |
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current.isLockOwned(o)) { |
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return true; |
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} |
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return false; |
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} |
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public Address owner() { return addr.getAddressAt(ownerFieldOffset); } |
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// FIXME |
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// void set_owner(void* owner); |
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public int waiters() { return waitersField.getValue(addr); } |
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public Address freeNext() { return addr.getAddressAt(FreeNextFieldOffset); } |
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// FIXME |
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// void set_queue(void* owner); |
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public int count() { return countField.getValue(addr); } |
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// FIXME |
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// void set_count(int count); |
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public long recursions() { return recursionsField.getValue(addr); } |
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public OopHandle object() { |
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return addr.getOopHandleAt(objectFieldOffset); |
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} |
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// contentions is always equal to count |
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public int contentions() { |
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return count(); |
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} |
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// FIXME |
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// void* object_addr(); |
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// void set_object(void* obj); |
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// The following four either aren't expressed as typed fields in |
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// vmStructs.cpp because they aren't strongly typed in the VM, or |
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// would confuse the SA's type system. |
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private static ObjectHeap heap; |
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private static long headerFieldOffset; |
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private static long objectFieldOffset; |
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private static long ownerFieldOffset; |
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private static long FreeNextFieldOffset; |
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private static JIntField countField; |
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private static JIntField waitersField; |
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private static CIntegerField recursionsField; |
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// FIXME: expose platform-dependent stuff |
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} |