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Implementation of the Truffle NFI using CLinker from project panama.
There is a newer version: 24.1.1
// CheckStyle: start generated
package com.oracle.truffle.nfi.backend.panama;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.TruffleLanguage;
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.UnadoptableNode;

@GeneratedBy(NativeString.class)
final class NativeStringGen {

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

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

    private NativeStringGen() {
    }

    @GeneratedBy(NativeString.class)
    static class InteropLibraryExports extends LibraryExport {

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

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

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

        @GeneratedBy(NativeString.class)
        static class Cached extends InteropLibrary {

            private final Class receiverClass_;

            protected Cached(Object receiver) {
                NativeString castReceiver = ((NativeString) receiver) ;
                this.receiverClass_ = castReceiver.getClass();
            }

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

            @Override
            public boolean isNull(Object receiver) {
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return (CompilerDirectives.castExact(receiver, receiverClass_)).isNull();
            }

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

            @Override
            public String asString(Object receiver) throws UnsupportedMessageException {
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return (CompilerDirectives.castExact(receiver, receiverClass_)).asString();
            }

            @Override
            public boolean isPointer(Object receiver) {
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return (CompilerDirectives.castExact(receiver, receiverClass_)).isPointer();
            }

            @Override
            public long asPointer(Object receiver) throws UnsupportedMessageException {
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return (CompilerDirectives.castExact(receiver, receiverClass_)).asPointer();
            }

            @Override
            public boolean hasLanguage(Object receiver) {
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return (CompilerDirectives.castExact(receiver, receiverClass_)).hasLanguage();
            }

            @Override
            public Class> getLanguage(Object receiver) throws UnsupportedMessageException {
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return (CompilerDirectives.castExact(receiver, receiverClass_)).getLanguage();
            }

            @TruffleBoundary
            @Override
            public Object toDisplayString(Object receiver, boolean allowSideEffects) {
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return (CompilerDirectives.castExact(receiver, receiverClass_)).toDisplayString(allowSideEffects);
            }

        }
        @GeneratedBy(NativeString.class)
        static class Uncached extends InteropLibrary implements UnadoptableNode {

            private final Class receiverClass_;

            protected Uncached(Object receiver) {
                this.receiverClass_ = ((NativeString) receiver).getClass();
            }

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

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

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

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

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

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

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

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

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

        }
    }
}