/*

 * Copyright (c) 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.

 *

 * 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

 * @library / /testlibrary /test/lib

 * @library ../common/patches

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

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

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

 *        jdk.vm.ci/jdk.vm.ci.hotspot.PublicMetaspaceWrapperObject

 * @build compiler.jvmci.compilerToVM.GetResolvedJavaMethodTest

 * @run main ClassFileInstaller

 *      sun.hotspot.WhiteBox

 *      sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run main/othervm -Xbootclasspath/a:.

 *                   -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI

 *                   -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI

 *                   compiler.jvmci.compilerToVM.GetResolvedJavaMethodTest

 */

package compiler.jvmci.compilerToVM;

import jdk.vm.ci.hotspot.CompilerToVMHelper;

import jdk.vm.ci.hotspot.HotSpotResolvedJavaMethod;

import jdk.vm.ci.hotspot.PublicMetaspaceWrapperObject;

import jdk.test.lib.Asserts;

import jdk.test.lib.Utils;

import sun.hotspot.WhiteBox;

import jdk.internal.misc.Unsafe;

import java.lang.reflect.Field;

public class GetResolvedJavaMethodTest {

    private static enum TestCase {

        NULL_BASE {

            @Override

            HotSpotResolvedJavaMethod getResolvedJavaMethod() {

                return CompilerToVMHelper.getResolvedJavaMethod(

                        null, getPtrToMethod());

            }

        },

        JAVA_METHOD_BASE {

            @Override

            HotSpotResolvedJavaMethod getResolvedJavaMethod() {

                HotSpotResolvedJavaMethod methodInstance

                        = CompilerToVMHelper.getResolvedJavaMethodAtSlot(

                                TEST_CLASS, 0);

                try {

                    METASPACE_METHOD_FIELD.set(methodInstance,

                            getPtrToMethod());

                } catch (ReflectiveOperationException e) {

                    throw new Error("TEST BUG : " + e, e);

                }

                return CompilerToVMHelper.getResolvedJavaMethod(

                        methodInstance, 0L);

            }

        },

        JAVA_METHOD_BASE_IN_TWO {

            @Override

            HotSpotResolvedJavaMethod getResolvedJavaMethod() {

                long ptr = getPtrToMethod();

                HotSpotResolvedJavaMethod methodInstance

                        = CompilerToVMHelper.getResolvedJavaMethodAtSlot(

                        TEST_CLASS, 0);

                try {

                    METASPACE_METHOD_FIELD.set(methodInstance, ptr / 2L);

                } catch (ReflectiveOperationException e) {

                    throw new Error("TESTBUG : " + e, e);

                }

                return CompilerToVMHelper.getResolvedJavaMethod(methodInstance,

                        ptr - ptr / 2L);

            }

        },

        JAVA_METHOD_BASE_ZERO {

            @Override

            HotSpotResolvedJavaMethod getResolvedJavaMethod() {

                long ptr = getPtrToMethod();

                HotSpotResolvedJavaMethod methodInstance

                        = CompilerToVMHelper.getResolvedJavaMethodAtSlot(

                        TEST_CLASS, 0);

                try {

                    METASPACE_METHOD_FIELD.set(methodInstance, 0L);

                } catch (ReflectiveOperationException e) {

                    throw new Error("TESTBUG : " + e, e);

                }

                return CompilerToVMHelper.getResolvedJavaMethod(methodInstance,

                        ptr);

            }

        }

        ;

        abstract HotSpotResolvedJavaMethod getResolvedJavaMethod();

    }

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

    private static final WhiteBox WB = WhiteBox.getWhiteBox();

    private static final Field METASPACE_METHOD_FIELD;

    private static final Class<?> TEST_CLASS = GetResolvedJavaMethodTest.class;

    private static final long PTR;

    static  {

        HotSpotResolvedJavaMethod method

                = CompilerToVMHelper.getResolvedJavaMethodAtSlot(TEST_CLASS, 0);

        try {

            // jdk.vm.ci.hotspot.HotSpotResolvedJavaMethodImpl.metaspaceMethod

            METASPACE_METHOD_FIELD = method.getClass()

                    .getDeclaredField("metaspaceMethod");

            METASPACE_METHOD_FIELD.setAccessible(true);

            PTR = (long) METASPACE_METHOD_FIELD.get(method);

        } catch (ReflectiveOperationException e) {

            throw new Error("TESTBUG : " + e, e);

        }

    }

    private static long getPtrToMethod() {

        Field field;

        try {

            field = TEST_CLASS.getDeclaredField("PTR");

        } catch (NoSuchFieldException e) {

            throw new Error("TEST BUG : " + e, e);

        }

        Object base = UNSAFE.staticFieldBase(field);

        return WB.getObjectAddress(base) + UNSAFE.staticFieldOffset(field);

    }

    public void test(TestCase testCase) {

        System.out.println(testCase.name());

        HotSpotResolvedJavaMethod result = testCase.getResolvedJavaMethod();

        Asserts.assertNotNull(result, testCase + " : got null");

        Asserts.assertEQ(TEST_CLASS,

                CompilerToVMHelper.getMirror(result.getDeclaringClass()),

                testCase + " : unexpected declaring class");

    }

    public static void main(String[] args) {

        GetResolvedJavaMethodTest test = new GetResolvedJavaMethodTest();

        for (TestCase testCase : TestCase.values()) {

            test.test(testCase);

        }

        testObjectBase();

        testMetaspaceWrapperBase();

    }

    private static void testMetaspaceWrapperBase() {

        try {

            HotSpotResolvedJavaMethod method

                    = CompilerToVMHelper.getResolvedJavaMethod(

                            new PublicMetaspaceWrapperObject() {

                                @Override

                                public long getMetaspacePointer() {

                                    return getPtrToMethod();

                                }

                            }, 0L);

            throw new AssertionError("Test METASPACE_WRAPPER_BASE."

                    + " Expected IllegalArgumentException has not been caught");

        } catch (IllegalArgumentException e) {

            // expected

        }

    }

    private static void testObjectBase() {

        try {

            HotSpotResolvedJavaMethod method

                    = CompilerToVMHelper.getResolvedJavaMethod(new Object(), 0L);

            throw new AssertionError("Test OBJECT_BASE."

                + " Expected IllegalArgumentException has not been caught");

        } catch (IllegalArgumentException e) {

            // expected

        }

    }

}