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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) 2014, 2021, 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
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
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 * (a) the Software, and
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 * (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),
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package com.oracle.truffle.object;

import java.util.Objects;

import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.object.Location;
import com.oracle.truffle.object.ShapeImpl.BaseAllocator;

final class DefaultStrategy extends LayoutStrategy {
    static final LayoutStrategy SINGLETON = new DefaultStrategy();

    private DefaultStrategy() {
    }

    @Override
    public boolean updateShape(DynamicObject object) {
        assert object.getShape().isValid();
        return false;
    }

    @Override
    public ShapeImpl ensureValid(ShapeImpl newShape) {
        assert newShape.isValid();
        return newShape;
    }

    private static boolean assertLocationInRange(ShapeImpl shape, Location location) {
        DefaultLayout layout = (DefaultLayout) shape.getLayout();
        assert (shape.getPrimitiveFieldSize() + ((LocationImpl) location).primitiveFieldCount() <= layout.getPrimitiveFieldCount());
        assert (shape.getObjectFieldSize() + ((LocationImpl) location).objectFieldCount() <= layout.getObjectFieldCount());
        return true;
    }

    @Override
    public ShapeImpl ensureSpace(ShapeImpl shape, Location location) {
        Objects.requireNonNull(location);
        assert assertLocationInRange(shape, location);
        return shape;
    }

    @Override
    public BaseAllocator createAllocator(ShapeImpl shape) {
        return new CoreAllocator(shape);
    }

    @Override
    public BaseAllocator createAllocator(LayoutImpl layout) {
        return new CoreAllocator(layout);
    }

    @Override
    protected Location createLocationForValue(ShapeImpl shape, Object value, long putFlags) {
        return ((CoreAllocator) shape.allocator()).locationForValue(value, true, value != null, putFlags);
    }

    @Override
    protected int getLocationOrdinal(Location location) {
        return CoreLocations.getLocationOrdinal(((CoreLocation) location));
    }
}