/*

 * 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

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 */

/*

 * @test

 * @bug 8136421

 * @requires (os.simpleArch == "x64" | os.simpleArch == "sparcv9" | os.simpleArch == "aarch64")

 * @library / /testlibrary /test/lib/

 * @build compiler.jvmci.compilerToVM.ReadUncompressedOopTest

 * @run main ClassFileInstaller

 *     sun.hotspot.WhiteBox

 *     sun.hotspot.WhiteBox$WhiteBoxPermission

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

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

 */

package compiler.jvmci.compilerToVM;

import jdk.vm.ci.hotspot.CompilerToVMHelper;

import jdk.test.lib.Asserts;

import jdk.test.lib.Utils;

import sun.hotspot.WhiteBox;

import sun.misc.Unsafe;

import java.lang.reflect.Field;

public class ReadUncompressedOopTest {

    public static void main(String args[])  {

        new ReadUncompressedOopTest().runTest();

    }

    private void runTest()  {

        long ptr = getPtr();

        System.out.printf("calling readUncompressedOop(0x%x)%n", ptr);

        Asserts.assertEQ(getClass(),

                CompilerToVMHelper.readUncompressedOop(ptr),

                String.format("unexpected class returned for 0x%x", ptr));

    }

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

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

    private static final Class<?> CLASS = ReadUncompressedOopTest.class;

    private static final long PTR = WB.getObjectAddress(CLASS);

    private static long getPtr() {

        Field field;

        try {

            field = CLASS.getDeclaredField("PTR");

        } catch (NoSuchFieldException nsfe) {

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

        }

        Object base = UNSAFE.staticFieldBase(field);

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

    }

}