/*

 * 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/

 * @library ../common/patches

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

 * @modules jdk.internal.vm.ci/jdk.vm.ci.hotspot

 * @build jdk.internal.vm.ci/jdk.vm.ci.hotspot.CompilerToVMHelper

 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI

 *                   -Djvmci.Compiler=null

 *                   compiler.jvmci.compilerToVM.GetImplementorTest

 */

package compiler.jvmci.compilerToVM;

import compiler.jvmci.common.testcases.AbstractClass;

import compiler.jvmci.common.testcases.AbstractClassExtender;

import compiler.jvmci.common.testcases.DoNotExtendClass;

import compiler.jvmci.common.testcases.DoNotImplementInterface;

import compiler.jvmci.common.testcases.MultipleImplementer1;

import compiler.jvmci.common.testcases.MultipleImplementer2;

import compiler.jvmci.common.testcases.MultipleImplementersInterface;

import compiler.jvmci.common.testcases.SingleImplementer;

import compiler.jvmci.common.testcases.SingleImplementerInterface;

import compiler.jvmci.common.testcases.SingleSubclass;

import compiler.jvmci.common.testcases.SingleSubclassedClass;

import jdk.test.lib.Asserts;

import jdk.test.lib.Utils;

import jdk.vm.ci.hotspot.CompilerToVMHelper;

import jdk.vm.ci.hotspot.HotSpotResolvedObjectType;

import java.util.HashSet;

import java.util.Set;

import java.util.stream.Stream;

public class GetImplementorTest {

    public static void main(String args[]) {

        GetImplementorTest test = new GetImplementorTest();

        for (TestCase tcase : createTestCases()) {

            test.runTest(tcase);

        }

    }

    private static Set<TestCase> createTestCases() {

        Set<TestCase> result = new HashSet<>();

        Stream.of(

                    SingleSubclass.class,

                    AbstractClassExtender.class,

                    MultipleImplementer2.class,

                    MultipleImplementer1.class,

                    MultipleImplementersInterface.class,

                    DoNotImplementInterface.class,

                    DoNotExtendClass.class,

                    AbstractClass.class,

                    SingleSubclassedClass.class)

                .forEach(Utils::ensureClassIsLoaded);

        // an interface with single class implementing it

        result.add(new TestCase(SingleImplementerInterface.class,

                SingleImplementer.class));

        /* an interface with multiple implementers. According to getImplementor

           javadoc, an itself should be returned in case of more than one

           implementor

         */

        result.add(new TestCase(MultipleImplementersInterface.class,

                MultipleImplementersInterface.class));

        // an interface with no implementors

        result.add(new TestCase(DoNotImplementInterface.class, null));

        // an abstract class with extender class

        result.add(new TestCase(AbstractClass.class, null));

        // a simple class, which is not extended

        result.add(new TestCase(DoNotExtendClass.class, null));

        // a usual class, which is extended

        result.add(new TestCase(SingleSubclassedClass.class, null));

        return result;

    }

    private void runTest(TestCase tcase) {

        System.out.println(tcase);

        HotSpotResolvedObjectType resolvedIface = CompilerToVMHelper

                .lookupTypeHelper(Utils.toJVMTypeSignature(tcase.anInterface),

                        getClass(), /* resolve = */ true);

        HotSpotResolvedObjectType resolvedImplementer = CompilerToVMHelper

                .getImplementor(resolvedIface);

        HotSpotResolvedObjectType resolvedExpected = null;

        if (tcase.expectedImplementer != null) {

            resolvedExpected = CompilerToVMHelper.lookupTypeHelper(Utils

                    .toJVMTypeSignature(tcase.expectedImplementer),

                    getClass(), /* resolve = */ true);

        }

        Asserts.assertEQ(resolvedImplementer, resolvedExpected,

                "Unexpected implementer for " + tcase.anInterface.getName());

    }

    private static class TestCase {

        public final Class<?> anInterface;

        public final Class<?> expectedImplementer;

        public TestCase(Class<?> iface, Class<?> expectedImplementer) {

            this.anInterface = iface;

            this.expectedImplementer = expectedImplementer;

        }

        @Override

        public String toString() {

            return String.format("CASE: interface=%s, expected=%s",

                    anInterface.getName(),

                    expectedImplementer == null

                            ? null

                            : expectedImplementer.getName());

        }

    }

}