/*

 * 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 java.base/jdk.internal.org.objectweb.asm

 *          java.base/jdk.internal.org.objectweb.asm.tree

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

 *          jdk.internal.vm.ci/jdk.vm.ci.code

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

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

 *                   -Djvmci.Compiler=null

 *                   compiler.jvmci.compilerToVM.ResolveMethodTest

 */

package compiler.jvmci.compilerToVM;

import compiler.jvmci.common.CTVMUtilities;

import compiler.jvmci.common.testcases.AbstractClass;

import compiler.jvmci.common.testcases.AbstractClassExtender;

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.internal.misc.Unsafe;

import jdk.test.lib.Asserts;

import jdk.test.lib.Utils;

import jdk.vm.ci.hotspot.CompilerToVMHelper;

import jdk.vm.ci.hotspot.HotSpotResolvedJavaMethod;

import jdk.vm.ci.hotspot.HotSpotResolvedObjectType;

import java.util.HashSet;

import java.util.Set;

public class ResolveMethodTest {

    private static final Unsafe UNSAFE = Unsafe.getUnsafe();

    public static void main(String args[]) {

        ResolveMethodTest test = new ResolveMethodTest();

        // positive cases

        try {

            for (TestCase tcase: createTestCases()) {

                test.runTest(tcase);

            }

        } catch (NoSuchMethodException e) {

            throw new Error("TEST BUG: can't find requested method", e);

        }

    }

    private static Set<TestCase> createTestCases() {

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

        // a usual class public method

        result.add(new TestCase(SingleSubclass.class, SingleSubclass.class,

                "usualMethod", ResolveMethodTest.class, true));

        // an array method

        result.add(new TestCase(int[].class, Object.class, "toString",

                ResolveMethodTest.class, true));

        // a method from base class, which was overriden in tested one

        result.add(new TestCase(SingleSubclass.class, SingleSubclass.class,

                "overridenMethod", ResolveMethodTest.class, true));

        // a method from base class, which was not overriden in tested one

        result.add(new TestCase(SingleSubclass.class,

                SingleSubclassedClass.class, "inheritedMethod",

                ResolveMethodTest.class, true));

        /* a method from base class, which was overriden in tested one with

           base class as holder */

        result.add(new TestCase(SingleSubclass.class,

                SingleSubclassedClass.class, "overridenMethod",

                ResolveMethodTest.class, true));

        // an interface method

        result.add(new TestCase(SingleImplementer.class,

                SingleImplementerInterface.class, "interfaceMethod",

                ResolveMethodTest.class, true));

        // an interface default method overriden in implementer

        result.add(new TestCase(MultipleImplementer1.class,

                MultipleImplementersInterface.class, "defaultMethod",

                ResolveMethodTest.class, true));

        // an interface default method not overriden in implementer

        result.add(new TestCase(MultipleImplementer2.class,

                MultipleImplementersInterface.class, "defaultMethod",

                ResolveMethodTest.class, true));

        // an abstract method

        result.add(new TestCase(AbstractClassExtender.class, AbstractClass.class,

                "abstractMethod", ResolveMethodTest.class, true));

        // private method with right accessor

        result.add(new TestCase(SingleSubclass.class, SingleSubclass.class,

                "privateMethod", SingleSubclass.class, true));

        // package-private method with right accessor

        result.add(new TestCase(SingleSubclass.class, SingleSubclass.class,

                "defaultAccessMethod", SingleSubclass.class, true));

        // negative cases

        // private method of another class

        result.add(new TestCase(SingleSubclass.class, SingleSubclass.class,

                "privateMethod", ResolveMethodTest.class, false));

        // package-private method from another package

        result.add(new TestCase(SingleSubclass.class, SingleSubclass.class,

                "defaultAccessMethod", ResolveMethodTest.class, false));

        return result;

    }

    private void runTest(TestCase tcase) throws NoSuchMethodException {

        System.out.println(tcase);

        HotSpotResolvedJavaMethod metaspaceMethod = CTVMUtilities

                .getResolvedMethod(tcase.holder,

                        tcase.holder.getDeclaredMethod(tcase.methodName));

        HotSpotResolvedObjectType holderMetaspace = CompilerToVMHelper

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

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

        HotSpotResolvedObjectType callerMetaspace = CompilerToVMHelper

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

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

        HotSpotResolvedObjectType receiverMetaspace = CompilerToVMHelper

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

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

        // Can only resolve methods on a linked class so force initialization

        receiverMetaspace.initialize();

        HotSpotResolvedJavaMethod resolvedMetaspaceMethod

                = CompilerToVMHelper.resolveMethod(receiverMetaspace,

                        metaspaceMethod, callerMetaspace);

        if (tcase.isPositive) {

            Asserts.assertNotNull(resolvedMetaspaceMethod,

                    "Unexpected null resolved method value for "

                            + tcase.methodName);

            Asserts.assertEQ(metaspaceMethod.getName(), tcase.methodName,

                    "Reflection and c2vm method names doesn't match");

        } else {

            Asserts.assertNull(resolvedMetaspaceMethod,

                    "Method unexpectedly resolved");

        }

    }

    private static class TestCase {

        public final Class<?> receiver;

        public final Class<?> holder;

        public final Class<?> caller;

        public final String methodName;

        public final boolean isPositive;

        public TestCase(Class<?> recv, Class<?> holder, String methodName,

                Class<?> caller, boolean isPositive) {

            this.receiver = recv;

            this.holder = holder;

            this.caller = caller;

            this.methodName = methodName;

            this.isPositive = isPositive;

        }

        @Override

        public String toString() {

            return String.format("CASE: receiver=%s, holder=%s, method=%s,"

                + "caller=%s, isPositive=%s%n", receiver.getName(),

                holder.getName(), methodName, caller.getName(), isPositive);

        }

    }

}