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 2000-2003 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.
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*/
package sun.jvm.hotspot.oops;
import java.io.*;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;
// An Instance is an instance of a Java Class
public class Instance extends Oop {
static {
VM.registerVMInitializedObserver(new Observer() {
public void update(Observable o, Object data) {
initialize(VM.getVM().getTypeDataBase());
}
});
}
private static long typeSize;
private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
Type type = db.lookupType("instanceOopDesc");
typeSize = type.getSize();
}
Instance(OopHandle handle, ObjectHeap heap) {
super(handle, heap);
}
// Returns header size in bytes.
public static long getHeaderSize() {
if (VM.getVM().isCompressedOopsEnabled()) {
return typeSize - VM.getVM().getIntSize();
} else {
return typeSize;
}
}
public boolean isInstance() { return true; }
public void iterateFields(OopVisitor visitor, boolean doVMFields) {
super.iterateFields(visitor, doVMFields);
((InstanceKlass) getKlass()).iterateNonStaticFields(visitor);
}
public void printValueOn(PrintStream tty) {
// Special-case strings.
// FIXME: would like to do this in more type-safe fashion (need
// SystemDictionary analogue)
if (getKlass().getName().asString().equals("java/lang/String")) {
tty.print("\"" + OopUtilities.stringOopToString(this) + "\"");
} else {
super.printValueOn(tty);
}
}
}