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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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/*
 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 * SOFTWARE.
 */
package com.oracle.truffle.polyglot;

import static com.oracle.truffle.api.interop.ForeignAccess.sendExecute;
import static com.oracle.truffle.api.interop.ForeignAccess.sendIsExecutable;
import static com.oracle.truffle.api.interop.ForeignAccess.sendIsInstantiable;
import static com.oracle.truffle.api.interop.ForeignAccess.sendNew;

import java.lang.reflect.Type;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.interop.ArityException;
import com.oracle.truffle.api.interop.Message;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.interop.UnsupportedTypeException;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.profiles.ConditionProfile;
import com.oracle.truffle.polyglot.PolyglotLanguageContext.ToGuestValuesNode;

final class PolyglotExecuteNode extends Node {

    private static final Object[] EMPTY = new Object[0];

    @Child private Node isExecutable = Message.IS_EXECUTABLE.createNode();
    @Child private Node isInstantiable = Message.IS_INSTANTIABLE.createNode();
    @Child private Node execute = Message.EXECUTE.createNode();
    @Child private Node instantiate = Message.NEW.createNode();
    private final ToGuestValuesNode toGuests = ToGuestValuesNode.create();
    private final ConditionProfile condition = ConditionProfile.createBinaryProfile();
    @Child private ToHostNode toHost = ToHostNode.create();

    public Object execute(PolyglotLanguageContext languageContext, TruffleObject function, Object functionArgsObject,
                    Class resultClass, Type resultType) {
        Object[] argsArray;
        if (functionArgsObject instanceof Object[]) {
            argsArray = (Object[]) functionArgsObject;
        } else {
            if (functionArgsObject == null) {
                argsArray = EMPTY;
            } else {
                argsArray = new Object[]{functionArgsObject};
            }
        }
        Object[] functionArgs = toGuests.apply(languageContext, argsArray);
        Object result;
        boolean executable = condition.profile(sendIsExecutable(isExecutable, function));
        try {
            if (executable) {
                result = sendExecute(execute, function, functionArgs);
            } else if (sendIsInstantiable(isInstantiable, function)) {
                result = sendNew(instantiate, function, functionArgs);
            } else {
                CompilerDirectives.transferToInterpreter();
                throw HostInteropErrors.executeUnsupported(languageContext, function);
            }
        } catch (UnsupportedTypeException e) {
            CompilerDirectives.transferToInterpreter();
            if (executable) {
                throw HostInteropErrors.invalidExecuteArgumentType(languageContext, function, functionArgs);
            } else {
                throw HostInteropErrors.invalidInstantiateArgumentType(languageContext, function, functionArgs);
            }
        } catch (ArityException e) {
            CompilerDirectives.transferToInterpreter();
            if (executable) {
                throw HostInteropErrors.invalidExecuteArity(languageContext, function, functionArgs, e.getExpectedArity(), e.getActualArity());
            } else {
                throw HostInteropErrors.invalidInstantiateArity(languageContext, function, functionArgs, e.getExpectedArity(), e.getActualArity());
            }
        } catch (UnsupportedMessageException e) {
            CompilerDirectives.transferToInterpreter();
            throw HostInteropErrors.executeUnsupported(languageContext, function);
        }
        return toHost.execute(result, resultClass, resultType, languageContext);
    }

}