/*
* Copyright (c) 2007, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.max.vm.layout;
import com.sun.max.unsafe.*;
import com.sun.max.vm.actor.holder.*;
import com.sun.max.vm.actor.member.*;
import com.sun.max.vm.layout.Layout.HeaderField;
/**
* A hub is like a tuple and a word array at the same time.
* Fields and word array elements overlap.
* All fields are concentrated in a bounded area of the word array,
* which starts at array offset zero.
* There is a fixed array index from which on there are no more fields.
*/
public interface HybridLayout extends TupleLayout, ArrayLayout {
int firstAvailableWordArrayIndex(Size tupleSize);
/**
* The resulting size must be aligned with a word array size.
*/
Size layoutFields(ClassActor superClassActor, FieldActor[] fieldActors);
/**
* Gets the header fields of this hybrid object layout.
*
* @return an array of header field descriptors sorted by ascending order of the field addresses in memory
*/
HeaderField[] headerFields();
}