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comparison test/compiler/intrinsics/unsafe/UnsafeGetAddressTest.java @ 17776:9ab9f254cfe2

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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
author poonam
date Mon, 24 Mar 2014 08:43:10 -0700
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17772:7d175751ef7f 17776:9ab9f254cfe2
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 */
23
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 */
31
32 import sun.misc.Unsafe;
33 import java.lang.reflect.*;
34
35 public class UnsafeGetAddressTest {
36 private static Unsafe unsafe;
37
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);
43
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 }
55
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 }
68