6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv
Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
/*
* Copyright 2000-2008 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
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*/
package sun.jvm.hotspot.oops;
import sun.jvm.hotspot.debugger.*;
// The class for an oop field simply provides access to the value.
public class NarrowOopField extends OopField {
public NarrowOopField(FieldIdentifier id, long offset, boolean isVMField) {
super(id, offset, isVMField);
}
public NarrowOopField(sun.jvm.hotspot.types.OopField vmField, long startOffset) {
super(new NamedFieldIdentifier(vmField.getName()), vmField.getOffset() + startOffset, true);
}
public NarrowOopField(InstanceKlass holder, int fieldArrayIndex) {
super(holder, fieldArrayIndex);
}
public Oop getValue(Oop obj) {
return obj.getHeap().newOop(getValueAsOopHandle(obj));
}
/** Debugging support */
public OopHandle getValueAsOopHandle(Oop obj) {
return obj.getHandle().getCompOopHandleAt(getOffset());
}
public void setValue(Oop obj) throws MutationException {
// Fix this: setOopAt is missing in Address
}
}