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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.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.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.UnexpectedResultException;
import com.oracle.truffle.sl.nodes.SLExpressionNode;
import java.util.List;

@GeneratedBy(SLExitBuiltin.class)
@SuppressWarnings("javadoc")
public final class SLExitBuiltinFactory implements NodeFactory {

    private static final SLExitBuiltinFactory INSTANCE = new SLExitBuiltinFactory();

    private SLExitBuiltinFactory() {
    }

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

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

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

    @Override
    public SLExitBuiltin 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 SLExitBuiltin create(SLExpressionNode[] arguments) {
        return new SLExitBuiltinNodeGen(arguments);
    }

    /**
     * Debug Info:      *   Specialization {@link SLExitBuiltin#doDefault}
     *     Activation probability: 1.00000
     *     With/without class size: 16/0 bytes
     * 
     */
    @GeneratedBy(SLExitBuiltin.class)
    @SuppressWarnings("javadoc")
    public static final class SLExitBuiltinNodeGen extends SLExitBuiltin {

        @Child private SLExpressionNode arguments0_;
        /**
         * State Info:          *   0: SpecializationActive {@link SLExitBuiltin#doDefault}
         * 
         */
        @CompilationFinal private int state_0_;

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

        @Override
        protected Object execute(VirtualFrame frameValue) {
            int state_0 = this.state_0_;
            long arguments0Value_;
            try {
                arguments0Value_ = this.arguments0_.executeLong(frameValue);
            } catch (UnexpectedResultException ex) {
                CompilerDirectives.transferToInterpreterAndInvalidate();
                return executeAndSpecialize(ex.getResult());
            }
            if (state_0 != 0 /* is SpecializationActive[SLExitBuiltin.doDefault(long)] */) {
                return doDefault(arguments0Value_);
            }
            CompilerDirectives.transferToInterpreterAndInvalidate();
            return executeAndSpecialize(arguments0Value_);
        }

        private Object executeAndSpecialize(Object arguments0Value) {
            int state_0 = this.state_0_;
            if (arguments0Value instanceof Long) {
                long arguments0Value_ = (long) arguments0Value;
                state_0 = state_0 | 0b1 /* add SpecializationActive[SLExitBuiltin.doDefault(long)] */;
                this.state_0_ = state_0;
                return doDefault(arguments0Value_);
            }
            throw new UnsupportedSpecializationException(this, new Node[] {this.arguments0_}, arguments0Value);
        }

    }
}