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Truffle SL is an example language implemented using the Truffle API.
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/*
 * Copyright (c) 2013, 2015, 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
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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),
 *
 * without restriction, including without limitation the rights to copy, create
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
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 * This license is subject to the following condition:
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 * The above copyright notice and either this complete permission notice or at a
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package com.oracle.truffle.sl.nodes.access;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.object.FinalLocationException;
import com.oracle.truffle.api.object.IncompatibleLocationException;
import com.oracle.truffle.api.object.Location;
import com.oracle.truffle.api.object.Property;
import com.oracle.truffle.api.object.Shape;

public abstract class SLWritePropertyCacheNode extends Node {
    protected static final int CACHE_LIMIT = 3;

    protected final String propertyName;

    public SLWritePropertyCacheNode(String propertyName) {
        this.propertyName = propertyName;
    }

    public abstract void executeObject(DynamicObject receiver, Object value);

    @Specialization(guards = {"location != null", "shape.check(receiver)", "canSet(location, receiver, value)"}, assumptions = "shape.getValidAssumption()", limit = "CACHE_LIMIT")
    public void writeExistingPropertyCached(DynamicObject receiver, Object value, //
                    @Cached("lookupLocation(receiver, value)") Location location, //
                    @Cached("receiver.getShape()") Shape shape) {
        try {
            location.set(receiver, value, shape);
        } catch (IncompatibleLocationException | FinalLocationException e) {
            throw new IllegalStateException(e);
        }
    }

    @Specialization(guards = {"existingLocation == null", "oldShape.check(receiver)", "canSet(newLocation, receiver, value)"}, assumptions = {"oldShape.getValidAssumption()",
                    "newShape.getValidAssumption()"}, limit = "CACHE_LIMIT")
    public void writeNewPropertyCached(DynamicObject receiver, Object value, //
                    @Cached("lookupLocation(receiver, value)") @SuppressWarnings("unused") Location existingLocation, //
                    @Cached("receiver.getShape()") Shape oldShape, //
                    @Cached("defineProperty(oldShape, value)") Shape newShape, //
                    @Cached("getLocation(newShape)") Location newLocation) {
        try {
            newLocation.set(receiver, value, oldShape, newShape);
        } catch (IncompatibleLocationException e) {
            throw new IllegalStateException(e);
        }
    }

    @Specialization(guards = "updateShape(receiver)")
    public void updateShapeAndWrite(DynamicObject receiver, Object value) {
        executeObject(receiver, value);
    }

    @TruffleBoundary
    @Specialization(contains = {"writeExistingPropertyCached", "writeNewPropertyCached", "updateShapeAndWrite"})
    public void writeUncached(DynamicObject receiver, Object value) {
        receiver.define(propertyName, value);
    }

    protected final Location lookupLocation(DynamicObject object, Object value) {
        final Property property = object.getShape().getProperty(propertyName);

        if (property != null && property.getLocation().canSet(object, value)) {
            return property.getLocation();
        } else {
            return null;
        }
    }

    protected final Shape defineProperty(Shape oldShape, Object value) {
        return oldShape.defineProperty(propertyName, value, 0);
    }

    protected final Location getLocation(Shape newShape) {
        return newShape.getProperty(propertyName).getLocation();
    }

    protected static boolean canSet(Location location, DynamicObject receiver, Object value) {
        return location.canSet(receiver, value);
    }

    protected static boolean updateShape(DynamicObject object) {
        CompilerDirectives.transferToInterpreter();
        return object.updateShape();
    }

}