1 /*

     2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

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

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

    21  * questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @bug 8155635

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

    28  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -Xbatch -XX:-TieredCompilation compiler.unsafe.MixedUnsafeStoreObject

    29  * @run main/othervm -Xbatch compiler.unsafe.MixedUnsafeStoreObject

    30  */

    31 

    32 package compiler.unsafe;

    33 

    34 import jdk.internal.misc.Unsafe;

    35 

    36 public class MixedUnsafeStoreObject {

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

    38 

    39     static final long F_OFFSET;

    40 

    41     static {

    42         try {

    43             F_OFFSET = UNSAFE.objectFieldOffset(T.class.getDeclaredField("f"));

    44         } catch (Exception e) {

    45             throw new Error(e);

    46         }

    47     }

    48 

    49     static class T {

    50         Object f;

    51     }

    52 

    53     public static void testFieldInstanceObject(Object t) {

    54         for (int c = 0; c < 20000; c++) { // trigger OSR compilation

    55             // java/lang/Object+12 *

    56             // _base = InstPtr, _ptr = BotPTR, _field = NULL, mismatched = true

    57             UNSAFE.putObject(t, F_OFFSET, "foo");

    58         }

    59     }

    60 

    61     public static void testFieldInstanceT(T t) {

    62         for (int c = 0; c < 20000; c++) { // trigger OSR compilation

    63             // ...$T+12 *

    64             // _base = InstPtr, _ptr = BotPTR, _field = T.f, mismatched = false

    65             UNSAFE.putObject(t, F_OFFSET, "foo");

    66         }

    67     }

    68     public static void main(String[] args) {

    69         testFieldInstanceObject(new T());

    70         testFieldInstanceT(new T());

    71     }

    72 }

    73