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/*
* Copyright 2000 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.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 JNIHandles {
private static AddressField globalHandlesField;
private static AddressField weakGlobalHandlesField;
private static OopField deletedHandleField;
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("JNIHandles");
globalHandlesField = type.getAddressField("_global_handles");
weakGlobalHandlesField = type.getAddressField("_weak_global_handles");
deletedHandleField = type.getOopField("_deleted_handle");
}
public JNIHandles() {
}
public JNIHandleBlock globalHandles() {
Address handleAddr = globalHandlesField.getValue();
if (handleAddr == null) {
return null;
}
return new JNIHandleBlock(handleAddr);
}
public JNIHandleBlock weakGlobalHandles() {
Address handleAddr = weakGlobalHandlesField.getValue();
if (handleAddr == null) {
return null;
}
return new JNIHandleBlock(handleAddr);
}
public OopHandle deletedHandle() {
return deletedHandleField.getValue();
}
public boolean isDeletedHandle(OopHandle handle) {
return (handle != null && handle.equals(deletedHandle()));
}
}
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