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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.polyglot;

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.UnsupportedSpecializationException;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.NodeCost;
import com.oracle.truffle.polyglot.DefaultScope.NullValue;
import com.oracle.truffle.polyglot.NullValueForeign.IsNullSubNode;
import java.util.concurrent.locks.Lock;

@GeneratedBy(NullValueForeign.class)
final class NullValueForeignFactory {

    @GeneratedBy(IsNullSubNode.class)
    static final class IsNullSubNodeGen extends IsNullSubNode {

        @CompilationFinal private int state_;

        private IsNullSubNodeGen() {
        }

        @Override
        public Object executeWithTarget(VirtualFrame frameValue, Object arg0Value) {
            int state = state_;
            if (state != 0 /* is-active accessWithTarget(NullValue) */ && arg0Value instanceof NullValue) {
                NullValue arg0Value_ = (NullValue) arg0Value;
                return accessWithTarget(arg0Value_);
            }
            CompilerDirectives.transferToInterpreterAndInvalidate();
            return executeAndSpecialize(arg0Value);
        }

        private Object executeAndSpecialize(Object arg0Value) {
            Lock lock = getLock();
            boolean hasLock = true;
            lock.lock();
            int state = state_;
            try {
                if (arg0Value instanceof NullValue) {
                    NullValue arg0Value_ = (NullValue) arg0Value;
                    this.state_ = state = state | 0b1 /* add-active accessWithTarget(NullValue) */;
                    lock.unlock();
                    hasLock = false;
                    return accessWithTarget(arg0Value_);
                }
                CompilerDirectives.transferToInterpreterAndInvalidate();
                throw new UnsupportedSpecializationException(this, new Node[] {null}, arg0Value);
            } finally {
                if (hasLock) {
                    lock.unlock();
                }
            }
        }

        @Override
        public NodeCost getCost() {
            int state = state_;
            if (state == 0b0) {
                return NodeCost.UNINITIALIZED;
            } else {
                return NodeCost.MONOMORPHIC;
            }
        }

        public static IsNullSubNode create() {
            return new IsNullSubNodeGen();
        }

    }
}