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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.metadata;
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;

/**
 * This message resolution is generated by {@link com.oracle.truffle.api.metadata.DefaultScopeVariables.VariablesMapObject.VariablesMapMessageResolution.VarsMapKeysNode}
 * It is used by the foreign access factory {@link com.oracle.truffle.api.metadata.VariablesMapMessageResolutionForeign}
 */
abstract class VarsMapKeysNodeSub extends com.oracle.truffle.api.metadata.DefaultScopeVariables.VariablesMapObject.VariablesMapMessageResolution.VarsMapKeysNode {
    public abstract Object executeWithTarget(VirtualFrame frame, Object o0);
    @Specialization
    protected Object accessWithTarget(com.oracle.truffle.api.metadata.DefaultScopeVariables.VariablesMapObject varMap) {
        return access(varMap);
    }
    private static final class KeysRootNode extends RootNode {
        protected KeysRootNode() {
            super(null);
        }

        @Child private VarsMapKeysNodeSub node = com.oracle.truffle.api.metadata.VarsMapKeysNodeSubNodeGen.create();
        @Override
        public Object execute(VirtualFrame frame) {
            Object receiver = ForeignAccess.getReceiver(frame);
            try {
                return node.executeWithTarget(frame, receiver);
            } catch (UnsupportedSpecializationException e) {
                if (e.getNode() instanceof VarsMapKeysNodeSub) {
                  throw UnsupportedTypeException.raise(e, e.getSuppliedValues());
                } else {
                  throw e;
                }
            }
        }

    }
    @Deprecated
    @SuppressWarnings("unused")
    public static RootNode createRoot(Class> language) {
        return createRoot();
    }
    public static RootNode createRoot() {
        return new KeysRootNode();
    }
}