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106 lines
3.3 KiB
Java
106 lines
3.3 KiB
Java
/*
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* @(#) $(JCGO)/goclsp/vm/java/lang/ref/VMReference.java --
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* VM specific methods for Java "Reference" class.
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**
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* Project: JCGO (http://www.ivmaisoft.com/jcgo/)
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* Copyright (C) 2001-2008 Ivan Maidanski <ivmai@ivmaisoft.com>
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* All rights reserved.
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*/
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/*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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**
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* This software is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License (GPL) for more details.
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**
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* Linking this library statically or dynamically with other modules is
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* making a combined work based on this library. Thus, the terms and
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* conditions of the GNU General Public License cover the whole
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* combination.
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**
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* As a special exception, the copyright holders of this library give you
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* permission to link this library with independent modules to produce an
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* executable, regardless of the license terms of these independent
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* modules, and to copy and distribute the resulting executable under
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* terms of your choice, provided that you also meet, for each linked
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* independent module, the terms and conditions of the license of that
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* module. An independent module is a module which is not derived from
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* or based on this library. If you modify this library, you may extend
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* this exception to your version of the library, but you are not
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* obligated to do so. If you do not wish to do so, delete this
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* exception statement from your version.
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*/
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package java.lang.ref;
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final class VMReference
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{ /* VM class */ /* used by VM classes only */
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static
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{
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if (!"".equals("")) /* hack */
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enqueueByGC0X(null, null); /* hack */
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}
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private VMReference() {}
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static final void initReferent(Reference ref, Object referent)
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{
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if (referent != null)
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setReferenceVmData(initReferent0(referent), ref);
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}
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static final void initEnqueuedReferent(Reference ref, Object referent)
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{
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if (referent != null)
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setReferenceVmData(initEnqueuedReferent0(ref, referent,
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ref instanceof PhantomReference ? 1 : 0), ref);
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}
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static final Object getReferent(Reference ref)
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{
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Object vmdata;
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return (vmdata = ref.vmdata) != null ? (ref instanceof SoftReference ?
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updateSoftRefAndGet0(vmdata) : getReferent0(vmdata)) : null;
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}
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static final void clearReferent(Reference ref)
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{
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ref.vmdata = null;
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}
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static final int enqueueByGC0X(Object refObj, Object vmdata)
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{ /* called from native code */
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Reference ref = (Reference) refObj;
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ref.vmdata = vmdata;
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ReferenceQueue queue;
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if ((queue = ref.queue) != null)
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queue.enqueue(ref);
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return 0;
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}
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private static void setReferenceVmData(Object vmdata, Reference ref)
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{
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if (vmdata == null)
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throw new OutOfMemoryError();
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ref.vmdata = vmdata;
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if (ref instanceof SoftReference)
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updateSoftRefAndGet0(vmdata);
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}
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private static native Object initReferent0(Object referent); /* JVM-core */
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private static native Object initEnqueuedReferent0(Object refObj,
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Object referent, int noclear); /* JVM-core */
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private static native Object getReferent0(Object vmdata); /* JVM-core */
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private static native Object updateSoftRefAndGet0(
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Object vmdata); /* JVM-core */
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}
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