AccessorTest.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package com.oracle.truffle.api.test.impl;

import static com.oracle.truffle.api.test.vm.ImplicitExplicitExportTest.L1;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.concurrent.Executors;

import org.junit.After;
import org.junit.BeforeClass;
import org.junit.Test;

import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.impl.Accessor;
import com.oracle.truffle.api.impl.TruffleLocator;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.source.Source;
import com.oracle.truffle.api.test.ReflectionUtils;
import com.oracle.truffle.api.test.vm.ImplicitExplicitExportTest.ExportImportLanguage1;
import com.oracle.truffle.api.vm.PolyglotEngine;

public class AccessorTest {
    private static Method find;
    private static Field instrumenthandler;
    private PolyglotEngine engine;

    /**
     * Reflection access to package-private members.
     *
     * @see Accessor#findLanguageByClass(Object, Class)
     * @see Accessor#INSTRUMENTHANDLER
     */
    @BeforeClass
    public static void initAccessors() throws Exception {
        find = Accessor.class.getDeclaredMethod("findLanguageByClass", Object.class, Class.class);
        ReflectionUtils.setAccessible(find, true);
        instrumenthandler = Accessor.class.getDeclaredField("INSTRUMENTHANDLER");
        ReflectionUtils.setAccessible(instrumenthandler, true);
    }

    @After
    public void dispose() {
        if (engine != null) {
            engine.dispose();
        }
    }

    @Test
    public void canGetAccessToOwnLanguageInstance() throws Exception {
        engine = PolyglotEngine.newBuilder().executor(Executors.newSingleThreadExecutor()).build();
        PolyglotEngine.Language language = engine.getLanguages().get(L1);
        assertNotNull("L1 language is defined", language);

        Source s = Source.newBuilder("return nothing").name("nothing").mimeType("content/unknown").build();
        Object ret = language.eval(s).get();
        assertNull("nothing is returned", ret);

        ExportImportLanguage1 afterInitialization = (ExportImportLanguage1) find.invoke(null, engine, ExportImportLanguage1.class);
        assertNotNull("Language found", afterInitialization);
    }

    /**
     * Test that {@link CallTarget}s can be called even when the instrumentation framework is not
     * initialized (e.g., when not using the {@link PolyglotEngine}).
     */
    @Test
    public void testAccessorInstrumentationHandlerNotInitialized() throws IllegalAccessException {
        Object savedAccessor = instrumenthandler.get(null);
        instrumenthandler.set(null, null);
        try {
            CallTarget testCallTarget = Truffle.getRuntime().createCallTarget(RootNode.createConstantNode(42));
            assertEquals(42, testCallTarget.call(new Object[0]));
        } finally {
            instrumenthandler.set(null, savedAccessor);
        }
    }

    @Test
    public void loadClassExistsInTruffleLocator() throws Exception {
        Method method = TruffleLocator.class.getDeclaredMethod("loadClass", String.class);
        assertEquals(Class.class, method.getReturnType());
    }
}