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Truffle is a multi-language framework for executing dynamic languages that achieves high performance when combined with Graal.

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/*
 * Copyright (c) 2012, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
 * derivative works of, display, perform, and distribute the Software and make,
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
 *
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 */
package com.oracle.truffle.object;

import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.object.Layout;
import com.oracle.truffle.api.object.Shape;

public class BasicLayout extends DefaultLayout {
    BasicLayout(LayoutStrategy strategy, int allowedImplicitCasts) {
        super(DynamicObjectBasic.class, strategy, allowedImplicitCasts, DynamicObjectBasic.OBJECT_FIELD_LOCATIONS, DynamicObjectBasic.PRIMITIVE_FIELD_LOCATIONS);
    }

    public static LayoutImpl createLayoutImpl(Layout.Builder builder) {
        Class dynamicObjectClass = getType(builder);
        if (dynamicObjectClass != null) {
            return DefaultLayout.createCoreLayout(builder);
        }
        return new BasicLayout(DefaultStrategy.SINGLETON, implicitCastFlags(getAllowedImplicitCasts(builder)));
    }

    @Override
    public DynamicObject newInstance(Shape shape) {
        return new DynamicObjectBasic(shape);
    }

    @Override
    protected DynamicObject construct(Shape shape) {
        return new DynamicObjectBasic(shape);
    }

    @Override
    protected boolean isLegacyLayout() {
        return true;
    }

    @Override
    protected int getLongFieldSize() {
        return 1;
    }
}