/*

 * Copyright (c) 2015, 2016, 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 8136421

 * @requires vm.jvmci

 * @library /test/lib /

 * @modules java.base/jdk.internal.misc:open

 * @run main/othervm -XX:+UnlockExperimentalVMOptions

 *      -Dcompiler.jvmci.compilerToVM.JVM_RegisterJVMCINatives.positive=true

 *      -XX:+EnableJVMCI

 *      compiler.jvmci.compilerToVM.JVM_RegisterJVMCINatives

 * @run main/othervm -XX:+UnlockExperimentalVMOptions

 *      -Dcompiler.jvmci.compilerToVM.JVM_RegisterJVMCINatives.positive=false

 *      -XX:-EnableJVMCI

 *      compiler.jvmci.compilerToVM.JVM_RegisterJVMCINatives

 */

package compiler.jvmci.compilerToVM;

import jdk.test.lib.Asserts;

import jdk.vm.ci.runtime.JVMCI;

import java.lang.reflect.Method;

public class JVM_RegisterJVMCINatives {

    private static final boolean IS_POSITIVE = Boolean.getBoolean(

            "compiler.jvmci.compilerToVM.JVM_RegisterJVMCINatives.positive");

    private final Method registerNatives;

    public static void main(String[] args) {

        new JVM_RegisterJVMCINatives().runTest();

    }

    private void runTest() {

        Object result;

        try {

            result = invoke();

        } catch (InternalError e) {

            if (IS_POSITIVE) {

                throw new AssertionError("unexpected exception", e);

            }

            return;

        }

        if (!IS_POSITIVE) {

            throw new AssertionError("didn't get expected exception");

        }

        Asserts.assertNull(result,

                "registerNatives()V returned non-null");

        Asserts.assertEQ(result, invoke(),

                "registerNatives returns different results");

    }

    private Object invoke() {

        Object result;

        try {

            result = registerNatives.invoke(JVMCI.class);

        } catch (ReflectiveOperationException e) {

            throw new Error("can't invoke registerNatives", e);

        }

        return result;

    }

    private JVM_RegisterJVMCINatives() {

        Method method;

        try {

            method = Class.forName("jdk.vm.ci.hotspot.CompilerToVM",

                    /* initialize = */ false,

                    this.getClass().getClassLoader())

                    .getDeclaredMethod("registerNatives");

            method.setAccessible(true);

        } catch (ReflectiveOperationException e) {

            throw new Error("can't find CompilerToVM::registerNatives", e);

        }

        registerNatives = method;

    }

}