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Truffle SL is an example language implemented using the Truffle API.
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// CheckStyle: start generated
package com.oracle.truffle.sl.builtins;

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.dsl.NeverDefault;
import com.oracle.truffle.api.dsl.NodeFactory;
import com.oracle.truffle.api.dsl.UnsupportedSpecializationException;
import com.oracle.truffle.api.dsl.DSLSupport.SpecializationDataNode;
import com.oracle.truffle.api.dsl.InlineSupport.ReferenceField;
import com.oracle.truffle.api.dsl.InlineSupport.UnsafeAccessedField;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.library.LibraryFactory;
import com.oracle.truffle.api.nodes.DenyReplace;
import com.oracle.truffle.api.nodes.EncapsulatingNodeReference;
import com.oracle.truffle.api.nodes.ExplodeLoop;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.sl.nodes.SLExpressionNode;
import java.lang.invoke.MethodHandles;
import java.util.List;
import java.util.Objects;

@GeneratedBy(SLIsInstanceBuiltin.class)
@SuppressWarnings({"javadoc", "unused"})
public final class SLIsInstanceBuiltinFactory implements NodeFactory {

    private static final SLIsInstanceBuiltinFactory INSTANCE = new SLIsInstanceBuiltinFactory();
    private static final LibraryFactory INTEROP_LIBRARY_ = LibraryFactory.resolve(InteropLibrary.class);

    private SLIsInstanceBuiltinFactory() {
    }

    @Override
    public Class getNodeClass() {
        return SLIsInstanceBuiltin.class;
    }

    @Override
    public List> getExecutionSignature() {
        return List.of(SLExpressionNode.class, SLExpressionNode.class);
    }

    @Override
    public List>> getNodeSignatures() {
        return List.of(List.of(SLExpressionNode[].class));
    }

    @Override
    public SLIsInstanceBuiltin createNode(Object... arguments) {
        if (arguments.length == 1 && (arguments[0] == null || arguments[0] instanceof SLExpressionNode[])) {
            return create((SLExpressionNode[]) arguments[0]);
        } else {
            throw new IllegalArgumentException("Invalid create signature.");
        }
    }

    public static NodeFactory getInstance() {
        return INSTANCE;
    }

    @NeverDefault
    public static SLIsInstanceBuiltin create(SLExpressionNode[] arguments) {
        return new SLIsInstanceBuiltinNodeGen(arguments);
    }

    /**
     * Debug Info:      *   Specialization {@link SLIsInstanceBuiltin#doDefault}
     *     Activation probability: 0.65000
     *     With/without class size: 19/4 bytes
     *   Specialization {@link SLIsInstanceBuiltin#doDefault}
     *     Activation probability: 0.35000
     *     With/without class size: 8/0 bytes
     * 
     */
    @GeneratedBy(SLIsInstanceBuiltin.class)
    @SuppressWarnings("javadoc")
    public static final class SLIsInstanceBuiltinNodeGen extends SLIsInstanceBuiltin {

        static final ReferenceField DEFAULT0_CACHE_UPDATER = ReferenceField.create(MethodHandles.lookup(), "default0_cache", Default0Data.class);

        @Child private SLExpressionNode arguments0_;
        @Child private SLExpressionNode arguments1_;
        /**
         * State Info:          *   0: SpecializationActive {@link SLIsInstanceBuiltin#doDefault}
         *   1: SpecializationActive {@link SLIsInstanceBuiltin#doDefault}
         * 
         */
        @CompilationFinal private int state_0_;
        @UnsafeAccessedField @Child private Default0Data default0_cache;

        private SLIsInstanceBuiltinNodeGen(SLExpressionNode[] arguments) {
            this.arguments0_ = arguments != null && 0 < arguments.length ? arguments[0] : null;
            this.arguments1_ = arguments != null && 1 < arguments.length ? arguments[1] : null;
        }

        @ExplodeLoop
        @Override
        protected Object execute(VirtualFrame frameValue) {
            int state_0 = this.state_0_;
            Object arguments0Value_ = this.arguments0_.executeGeneric(frameValue);
            Object arguments1Value_ = this.arguments1_.executeGeneric(frameValue);
            if (state_0 != 0 /* is SpecializationActive[SLIsInstanceBuiltin.doDefault(Object, Object, InteropLibrary)] || SpecializationActive[SLIsInstanceBuiltin.doDefault(Object, Object, InteropLibrary)] */) {
                if ((state_0 & 0b1) != 0 /* is SpecializationActive[SLIsInstanceBuiltin.doDefault(Object, Object, InteropLibrary)] */) {
                    Default0Data s0_ = this.default0_cache;
                    while (s0_ != null) {
                        if ((s0_.metaLib_.accepts(arguments0Value_)) && (s0_.metaLib_.isMetaObject(arguments0Value_))) {
                            return doDefault(arguments0Value_, arguments1Value_, s0_.metaLib_);
                        }
                        s0_ = s0_.next_;
                    }
                }
                if ((state_0 & 0b10) != 0 /* is SpecializationActive[SLIsInstanceBuiltin.doDefault(Object, Object, InteropLibrary)] */) {
                    EncapsulatingNodeReference encapsulating_ = EncapsulatingNodeReference.getCurrent();
                    Node prev_ = encapsulating_.set(this);
                    try {
                        {
                            InteropLibrary metaLib__ = (INTEROP_LIBRARY_.getUncached());
                            if ((metaLib__.isMetaObject(arguments0Value_))) {
                                return this.default1Boundary(state_0, arguments0Value_, arguments1Value_);
                            }
                        }
                    } finally {
                        encapsulating_.set(prev_);
                    }
                }
            }
            CompilerDirectives.transferToInterpreterAndInvalidate();
            return executeAndSpecialize(arguments0Value_, arguments1Value_);
        }

        @SuppressWarnings("static-method")
        @TruffleBoundary
        private Object default1Boundary(int state_0, Object arguments0Value_, Object arguments1Value_) {
            {
                InteropLibrary metaLib__ = (INTEROP_LIBRARY_.getUncached());
                return doDefault(arguments0Value_, arguments1Value_, metaLib__);
            }
        }

        @SuppressWarnings("unused")
        private Object executeAndSpecialize(Object arguments0Value, Object arguments1Value) {
            int state_0 = this.state_0_;
            if (((state_0 & 0b10)) == 0 /* is-not SpecializationActive[SLIsInstanceBuiltin.doDefault(Object, Object, InteropLibrary)] */) {
                while (true) {
                    int count0_ = 0;
                    Default0Data s0_ = DEFAULT0_CACHE_UPDATER.getVolatile(this);
                    Default0Data s0_original = s0_;
                    while (s0_ != null) {
                        if ((s0_.metaLib_.accepts(arguments0Value)) && (s0_.metaLib_.isMetaObject(arguments0Value))) {
                            break;
                        }
                        count0_++;
                        s0_ = s0_.next_;
                    }
                    if (s0_ == null) {
                        {
                            InteropLibrary metaLib__ = this.insert((INTEROP_LIBRARY_.create(arguments0Value)));
                            // assert (s0_.metaLib_.accepts(arguments0Value));
                            if ((metaLib__.isMetaObject(arguments0Value)) && count0_ < (3)) {
                                s0_ = this.insert(new Default0Data(s0_original));
                                Objects.requireNonNull(s0_.insert(metaLib__), "A specialization cache returned a default value. The cache initializer must never return a default value for this cache. Use @Cached(neverDefault=false) to allow default values for this cached value or make sure the cache initializer never returns the default value.");
                                s0_.metaLib_ = metaLib__;
                                if (!DEFAULT0_CACHE_UPDATER.compareAndSet(this, s0_original, s0_)) {
                                    continue;
                                }
                                state_0 = state_0 | 0b1 /* add SpecializationActive[SLIsInstanceBuiltin.doDefault(Object, Object, InteropLibrary)] */;
                                this.state_0_ = state_0;
                            }
                        }
                    }
                    if (s0_ != null) {
                        return doDefault(arguments0Value, arguments1Value, s0_.metaLib_);
                    }
                    break;
                }
            }
            {
                InteropLibrary metaLib__ = null;
                {
                    EncapsulatingNodeReference encapsulating_ = EncapsulatingNodeReference.getCurrent();
                    Node prev_ = encapsulating_.set(this);
                    try {
                        {
                            metaLib__ = (INTEROP_LIBRARY_.getUncached());
                            if ((metaLib__.isMetaObject(arguments0Value))) {
                                this.default0_cache = null;
                                state_0 = state_0 & 0xfffffffe /* remove SpecializationActive[SLIsInstanceBuiltin.doDefault(Object, Object, InteropLibrary)] */;
                                state_0 = state_0 | 0b10 /* add SpecializationActive[SLIsInstanceBuiltin.doDefault(Object, Object, InteropLibrary)] */;
                                this.state_0_ = state_0;
                                return doDefault(arguments0Value, arguments1Value, metaLib__);
                            }
                        }
                    } finally {
                        encapsulating_.set(prev_);
                    }
                }
            }
            throw new UnsupportedSpecializationException(this, new Node[] {this.arguments0_, this.arguments1_}, arguments0Value, arguments1Value);
        }

        @GeneratedBy(SLIsInstanceBuiltin.class)
        @DenyReplace
        private static final class Default0Data extends Node implements SpecializationDataNode {

            @Child Default0Data next_;
            /**
             * Source Info:              *   Specialization: {@link SLIsInstanceBuiltin#doDefault}
             *   Parameter: {@link InteropLibrary} metaLib
             */
            @Child InteropLibrary metaLib_;

            Default0Data(Default0Data next_) {
                this.next_ = next_;
            }

        }
    }
}