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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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// CheckStyle: start generated
package com.oracle.truffle.api.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.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 java.util.concurrent.locks.Lock;

@GeneratedBy(HashIterator.class)
final class HashIteratorGen {

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

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

    private HashIteratorGen() {
    }

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

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

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

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

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

            @Child private InteropLibrary receiverEntriesIteratorInteropLibrary_;
            @CompilationFinal private volatile int state_0_;
            @Child private InteropLibrary getIteratorNextElementNode__getIteratorNextElement_arrays_;

            protected Cached(Object receiver) {
                HashIterator castReceiver = ((HashIterator) receiver) ;
                this.receiverEntriesIteratorInteropLibrary_ = super.insert(INTEROP_LIBRARY_.create((castReceiver.entriesIterator)));
            }

            @Override
            public boolean accepts(Object receiver) {
                assert !(receiver instanceof HashIterator) || DYNAMIC_DISPATCH_LIBRARY_.getUncached().dispatch(receiver) == null : "Invalid library export. Exported receiver with dynamic dispatch found but not expected.";
                if (!(receiver instanceof HashIterator)) {
                    return false;
                } else if (!this.receiverEntriesIteratorInteropLibrary_.accepts((((HashIterator) receiver).entriesIterator))) {
                    return false;
                } else {
                    return true;
                }
            }

            @Override
            public boolean isIterator(Object receiver) {
                assert receiver instanceof HashIterator : "Invalid library usage. Library does not accept given receiver.";
                assert assertAdopted();
                return (((HashIterator) receiver)).isIterator();
            }

            @Override
            public boolean hasIteratorNextElement(Object arg0Value_) throws UnsupportedMessageException {
                assert arg0Value_ instanceof HashIterator : "Invalid library usage. Library does not accept given receiver.";
                assert assertAdopted();
                HashIterator arg0Value = ((HashIterator) arg0Value_);
                {
                    InteropLibrary hasIteratorNextElementNode__hasIteratorNextElement_iterators__ = this.receiverEntriesIteratorInteropLibrary_;
                    return arg0Value.hasIteratorNextElement(hasIteratorNextElementNode__hasIteratorNextElement_iterators__);
                }
            }

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

            @Override
            public Object getIteratorNextElement(Object arg0Value_) throws UnsupportedMessageException, StopIterationException {
                assert arg0Value_ instanceof HashIterator : "Invalid library usage. Library does not accept given receiver.";
                assert assertAdopted();
                HashIterator arg0Value = ((HashIterator) arg0Value_);
                int state_0 = this.state_0_;
                if (state_0 != 0 /* is-state_0 getIteratorNextElement(HashIterator, InteropLibrary, InteropLibrary) */) {
                    {
                        InteropLibrary getIteratorNextElementNode__getIteratorNextElement_iterators__ = this.receiverEntriesIteratorInteropLibrary_;
                        return arg0Value.getIteratorNextElement(getIteratorNextElementNode__getIteratorNextElement_iterators__, this.getIteratorNextElementNode__getIteratorNextElement_arrays_);
                    }
                }
                CompilerDirectives.transferToInterpreterAndInvalidate();
                return getIteratorNextElementNode_AndSpecialize(arg0Value);
            }

            private Object getIteratorNextElementNode_AndSpecialize(HashIterator arg0Value) throws UnsupportedMessageException, StopIterationException {
                Lock lock = getLock();
                boolean hasLock = true;
                lock.lock();
                try {
                    int state_0 = this.state_0_;
                    {
                        InteropLibrary getIteratorNextElementNode__getIteratorNextElement_iterators__ = null;
                        getIteratorNextElementNode__getIteratorNextElement_iterators__ = this.receiverEntriesIteratorInteropLibrary_;
                        this.getIteratorNextElementNode__getIteratorNextElement_arrays_ = super.insert((INTEROP_LIBRARY_.createDispatched(1)));
                        this.state_0_ = state_0 = state_0 | 0b1 /* add-state_0 getIteratorNextElement(HashIterator, InteropLibrary, InteropLibrary) */;
                        lock.unlock();
                        hasLock = false;
                        return arg0Value.getIteratorNextElement(getIteratorNextElementNode__getIteratorNextElement_iterators__, this.getIteratorNextElementNode__getIteratorNextElement_arrays_);
                    }
                } finally {
                    if (hasLock) {
                        lock.unlock();
                    }
                }
            }

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

            protected Uncached() {
            }

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

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

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

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

            @TruffleBoundary
            @Override
            public boolean hasIteratorNextElement(Object arg0Value_) {
                // declared: true
                assert this.accepts(arg0Value_) : "Invalid library usage. Library does not accept given receiver.";
                HashIterator arg0Value = ((HashIterator) arg0Value_);
                return arg0Value.hasIteratorNextElement(INTEROP_LIBRARY_.getUncached((arg0Value.entriesIterator)));
            }

            @TruffleBoundary
            @Override
            public Object getIteratorNextElement(Object arg0Value_) throws UnsupportedMessageException, StopIterationException {
                // declared: true
                assert this.accepts(arg0Value_) : "Invalid library usage. Library does not accept given receiver.";
                HashIterator arg0Value = ((HashIterator) arg0Value_);
                return arg0Value.getIteratorNextElement(INTEROP_LIBRARY_.getUncached((arg0Value.entriesIterator)), (INTEROP_LIBRARY_.getUncached()));
            }

        }
    }
}