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Truffle SL is an example language implemented using the Truffle API.
There is a newer version: 24.1.1
// CheckStyle: start generated
package com.oracle.truffle.sl.nodes.interop;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.dsl.GeneratedBy;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.library.DynamicDispatchLibrary;
import com.oracle.truffle.api.library.LibraryExport;
import com.oracle.truffle.api.library.LibraryFactory;
import com.oracle.truffle.api.nodes.DenyReplace;
import com.oracle.truffle.api.nodes.NodeCost;
import com.oracle.truffle.api.source.SourceSection;
import com.oracle.truffle.api.strings.TruffleString;
import com.oracle.truffle.api.strings.TruffleString.ToJavaStringNode;
import com.oracle.truffle.sl.nodes.interop.NodeObjectDescriptor.NameSymbol;
import java.util.concurrent.locks.Lock;

@GeneratedBy(NameSymbol.class)
final class NameSymbolGen {

    private static final LibraryFactory DYNAMIC_DISPATCH_LIBRARY_ = LibraryFactory.resolve(DynamicDispatchLibrary.class);

    static  {
        LibraryExport.register(NameSymbol.class, new InteropLibraryExports());
    }

    private NameSymbolGen() {
    }

    @GeneratedBy(NameSymbol.class)
    private static final class InteropLibraryExports extends LibraryExport {

        private InteropLibraryExports() {
            super(InteropLibrary.class, NameSymbol.class, false, false, 0);
        }

        @Override
        protected InteropLibrary createUncached(Object receiver) {
            assert receiver instanceof NameSymbol;
            InteropLibrary uncached = new Uncached();
            return uncached;
        }

        @Override
        protected InteropLibrary createCached(Object receiver) {
            assert receiver instanceof NameSymbol;
            return new Cached();
        }

        @GeneratedBy(NameSymbol.class)
        private static final class Cached extends InteropLibrary {

            @CompilationFinal private volatile int state_0_;
            @Child private ToJavaStringNode toJavaStringNode_;

            protected Cached() {
            }

            @Override
            public boolean accepts(Object receiver) {
                assert !(receiver instanceof NameSymbol) || DYNAMIC_DISPATCH_LIBRARY_.getUncached().dispatch(receiver) == null : "Invalid library export. Exported receiver with dynamic dispatch found but not expected.";
                return receiver instanceof NameSymbol;
            }

            @Override
            public boolean isString(Object receiver) {
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                assert assertAdopted();
                return (((NameSymbol) receiver)).isString();
            }

            @Override
            public String asString(Object arg0Value_) throws UnsupportedMessageException {
                assert this.accepts(arg0Value_) : "Invalid library usage. Library does not accept given receiver.";
                assert assertAdopted();
                NameSymbol arg0Value = ((NameSymbol) arg0Value_);
                int state_0 = this.state_0_;
                if (state_0 != 0 /* is-state_0 asString(NameSymbol, ToJavaStringNode) */) {
                    return arg0Value.asString(this.toJavaStringNode_);
                }
                CompilerDirectives.transferToInterpreterAndInvalidate();
                return executeAndSpecialize(arg0Value);
            }

            private String executeAndSpecialize(NameSymbol arg0Value) {
                Lock lock = getLock();
                boolean hasLock = true;
                lock.lock();
                try {
                    int state_0 = this.state_0_;
                    this.toJavaStringNode_ = super.insert((ToJavaStringNode.create()));
                    this.state_0_ = state_0 = state_0 | 0b1 /* add-state_0 asString(NameSymbol, ToJavaStringNode) */;
                    lock.unlock();
                    hasLock = false;
                    return arg0Value.asString(this.toJavaStringNode_);
                } finally {
                    if (hasLock) {
                        lock.unlock();
                    }
                }
            }

            @Override
            public NodeCost getCost() {
                int state_0 = this.state_0_;
                if (state_0 == 0) {
                    return NodeCost.UNINITIALIZED;
                } else {
                    return NodeCost.MONOMORPHIC;
                }
            }

            @Override
            public TruffleString asTruffleString(Object receiver) throws UnsupportedMessageException {
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                assert assertAdopted();
                return (((NameSymbol) receiver)).asTruffleString();
            }

            @Override
            public boolean hasSourceLocation(Object receiver) {
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                assert assertAdopted();
                return (((NameSymbol) receiver)).hasSourceLocation();
            }

            @Override
            public SourceSection getSourceLocation(Object receiver) throws UnsupportedMessageException {
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                assert assertAdopted();
                return (((NameSymbol) receiver)).getSourceLocation();
            }

        }
        @GeneratedBy(NameSymbol.class)
        @DenyReplace
        private static final class Uncached extends InteropLibrary {

            protected Uncached() {
            }

            @Override
            @TruffleBoundary
            public boolean accepts(Object receiver) {
                assert !(receiver instanceof NameSymbol) || DYNAMIC_DISPATCH_LIBRARY_.getUncached().dispatch(receiver) == null : "Invalid library export. Exported receiver with dynamic dispatch found but not expected.";
                return receiver instanceof NameSymbol;
            }

            @Override
            public boolean isAdoptable() {
                return false;
            }

            @Override
            public NodeCost getCost() {
                return NodeCost.MEGAMORPHIC;
            }

            @TruffleBoundary
            @Override
            public boolean isString(Object receiver) {
                // declared: true
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return ((NameSymbol) receiver) .isString();
            }

            @TruffleBoundary
            @Override
            public String asString(Object arg0Value_) {
                // declared: true
                assert this.accepts(arg0Value_) : "Invalid library usage. Library does not accept given receiver.";
                NameSymbol arg0Value = ((NameSymbol) arg0Value_);
                return arg0Value.asString((ToJavaStringNode.getUncached()));
            }

            @TruffleBoundary
            @Override
            public TruffleString asTruffleString(Object receiver) throws UnsupportedMessageException {
                // declared: true
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return ((NameSymbol) receiver) .asTruffleString();
            }

            @TruffleBoundary
            @Override
            public boolean hasSourceLocation(Object receiver) {
                // declared: true
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return ((NameSymbol) receiver) .hasSourceLocation();
            }

            @TruffleBoundary
            @Override
            public SourceSection getSourceLocation(Object receiver) throws UnsupportedMessageException {
                // declared: true
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return ((NameSymbol) receiver) .getSourceLocation();
            }

        }
    }
}