jdk8-mips64-public/hotspot: test/compiler/intrinsics/unsafe/UnsafeGetAddressTest.java@9ab9f254cfe2

6653795: C2 intrinsic for Unsafe.getAddress performs pointer sign extension on 32-bit systems
Summary: Native pointers less than 64 bits wide should be extended as an unsigned number.
Reviewed-by: kvn, kevinw

     1 /*

     2  * Copyright (c) 2014, 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  */

    24 /*

    25  * @test

    26  * @bug 6653795

    27  * @summary C2 intrinsic for Unsafe.getAddress performs pointer sign extension on 32-bit systems

    28  * @run main UnsafeGetAddressTest

    29  *

    30  */

    32 import sun.misc.Unsafe;

    33 import java.lang.reflect.*;

    35 public class UnsafeGetAddressTest {

    36     private static Unsafe unsafe;

    38     public static void main(String[] args) throws Exception {

    39         Class c = UnsafeGetAddressTest.class.getClassLoader().loadClass("sun.misc.Unsafe");

    40         Field f = c.getDeclaredField("theUnsafe");

    41         f.setAccessible(true);

    42         unsafe = (Unsafe)f.get(c);

    44         long address = unsafe.allocateMemory(unsafe.addressSize());

    45         unsafe.putAddress(address, 0x0000000080000000L);

    46         // from sun.misc.Unsafe.getAddress' documentation:

    47         // "If the native pointer is less than 64 bits wide, it is

    48         // extended as an unsigned number to a Java long."

    49         result = unsafe.getAddress(address);

    50         System.out.printf("1: was 0x%x, expected 0x%x\n", result,

    51                 0x0000000080000000L);

    52         for (int i = 0; i < 1000000; i++) {

    53             result = unsafe.getAddress(address);

    54         }

    56         // The code has got compiled, check the result now

    57         System.out.printf("2: was 0x%x, expected 0x%x\n", result,

    58                 0x0000000080000000L);

    59         if (result != 0x0000000080000000L) {

    60             System.out.println("Test Failed");

    61             System.exit(97);

    62         } else {

    63             System.out.println("Test Passed");

    64         }

    65     }

    66     static volatile long result;

    67 }

Mercurial > jdk8-mips64-public > hotspot / file revision

test/compiler/intrinsics/unsafe/UnsafeGetAddressTest.java@9ab9f254cfe2

test/compiler/intrinsics/unsafe/UnsafeGetAddressTest.java