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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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package com.oracle.truffle.api.interop.java;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.TruffleLanguage;
import com.oracle.truffle.api.interop.ForeignAccess;
import com.oracle.truffle.api.dsl.UnsupportedSpecializationException;
import com.oracle.truffle.api.interop.UnsupportedTypeException;
abstract class IsExecutableNodeSub extends com.oracle.truffle.api.interop.java.JavaFunctionMessageResolution.IsExecutableNode {
    public abstract Object executeWithTarget(VirtualFrame frame, Object o0);
    @Specialization
    protected Object accessWithTarget(com.oracle.truffle.api.interop.java.JavaFunctionObject receiver) {
        return access(receiver);
    }
    private final static class IS_EXECUTABLERootNode extends RootNode {
        protected IS_EXECUTABLERootNode(Class> language) {
            super(language, null, null);
        }

        @Child private IsExecutableNodeSub node = com.oracle.truffle.api.interop.java.IsExecutableNodeSubNodeGen.create();
        @Override
        public Object execute(VirtualFrame frame) {
            Object receiver = ForeignAccess.getReceiver(frame);
            try {
                return node.executeWithTarget(frame, receiver);
            } catch (UnsupportedSpecializationException e) {
                throw UnsupportedTypeException.raise(e.getSuppliedValues());
            }
        }

    }
    public static RootNode createRoot(Class> language) {
        return new IS_EXECUTABLERootNode(language);
    }
}