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Truffle SL is an example language implemented using the Truffle API.

There is a newer version: 1.0.0-rc7

package com.oracle.truffle.sl.runtime;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.TruffleLanguage;
import com.oracle.truffle.api.interop.ForeignAccess;
import com.oracle.truffle.api.dsl.UnsupportedSpecializationException;
import com.oracle.truffle.api.interop.UnsupportedTypeException;
abstract class CheckNullSub extends com.oracle.truffle.sl.runtime.SLNullMessageResolution.CheckNull {
    public abstract Object executeWithTarget(VirtualFrame frame, Object o);
    @Specialization
    protected Object testWithTarget(com.oracle.truffle.api.interop.TruffleObject receiver) {
        return test(receiver);
    }
    private final static class LanguageCheckRootNode extends RootNode {
        protected LanguageCheckRootNode(Class> language) {
            super(language, null, null);
        }

        @Child private CheckNullSub node = com.oracle.truffle.sl.runtime.CheckNullSubNodeGen.create();
        @Override
        public Object execute(VirtualFrame frame) {
            try {
              Object receiver = ForeignAccess.getReceiver(frame);
              return node.executeWithTarget(frame, receiver);
            } catch (UnsupportedSpecializationException e) {
                throw UnsupportedTypeException.raise(e.getSuppliedValues());
            }
        }

    }
    public static RootNode createRoot(Class> language) {
        return new LanguageCheckRootNode(language);
    }
}