/*
 * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
 * 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 org.graalvm.compiler.truffle.test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;

import org.graalvm.compiler.api.test.Graal;
import org.graalvm.compiler.runtime.RuntimeProvider;
import org.junit.Test;

import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.TruffleRuntime;
import com.oracle.truffle.api.impl.DefaultTruffleRuntime;
import com.oracle.truffle.api.impl.TVMCI;
import com.oracle.truffle.api.object.LayoutFactory;

@AddExports("jdk.internal.vm.ci/jdk.vm.ci.services")
public class TruffleRuntimeTest {

    @Test
    public void testGraalCapabilities() {
        assertNotNull(Graal.getRuntime().getCapability(RuntimeProvider.class));
    }

    @Test
    public void testRuntimeAvailable() {
        assertNotNull(Truffle.getRuntime());
    }

    @Test
    public void testRuntimeIsGraalRuntime() {
        TruffleRuntime runtime = Truffle.getRuntime();
        assertTrue(runtime.getClass() != DefaultTruffleRuntime.class);
    }

    @Test
    public void testGetTVMCI() {
        TruffleRuntime runtime = Truffle.getRuntime();
        TVMCI tvmci = runtime.getCapability(TVMCI.class);
        assertNotNull("Truffle Virtual Machine Compiler Interface not found", tvmci);
        assertEquals("GraalTVMCI", tvmci.getClass().getSimpleName());

        abstract class TVMCISubclass extends TVMCI {
        }
        TVMCISubclass subclass = runtime.getCapability(TVMCISubclass.class);
        assertNull("Expected null return value for TVMCI subclass", subclass);
    }

    @Test
    public void testGetCapabilityObjectClass() {
        Object object = Truffle.getRuntime().getCapability(Object.class);
        assertNull("Expected null return value for Object.class", object);
    }

    @Test
    public void testGetLayoutFactory() {
        TruffleRuntime runtime = Truffle.getRuntime();
        LayoutFactory layoutFactory = runtime.getCapability(LayoutFactory.class);
        assertNotNull("LayoutFactory not found", layoutFactory);

        boolean java8OrEarlier = System.getProperty("java.specification.version").compareTo("1.9") < 0;
        ClassLoader layoutFactoryCL = layoutFactory.getClass().getClassLoader();
        if (java8OrEarlier) {
            // Bootstrap class loader or JVMCI class loader
            assertTrue(layoutFactoryCL == null || layoutFactoryCL == runtime.getClass().getClassLoader());
        } else {
            // Rely on modules to only load trusted service providers
        }
    }
}