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annotate 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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17776
9ab9f254cfe2 6653795: C2 intrinsic for Unsafe.getAddress performs pointer sign extension on 32-bit systems
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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
9ab9f254cfe2 6653795: C2 intrinsic for Unsafe.getAddress performs pointer sign extension on 32-bit systems
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
9ab9f254cfe2 6653795: C2 intrinsic for Unsafe.getAddress performs pointer sign extension on 32-bit systems
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
9ab9f254cfe2 6653795: C2 intrinsic for Unsafe.getAddress performs pointer sign extension on 32-bit systems
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /*
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25 * @test
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26 * @bug 6653795
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27 * @summary C2 intrinsic for Unsafe.getAddress performs pointer sign extension on 32-bit systems
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28 * @run main UnsafeGetAddressTest
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29 *
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30 */
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31
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32 import sun.misc.Unsafe;
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33 import java.lang.reflect.*;
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34
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35 public class UnsafeGetAddressTest {
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36 private static Unsafe unsafe;
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37
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38 public static void main(String[] args) throws Exception {
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39 Class c = UnsafeGetAddressTest.class.getClassLoader().loadClass("sun.misc.Unsafe");
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40 Field f = c.getDeclaredField("theUnsafe");
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41 f.setAccessible(true);
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42 unsafe = (Unsafe)f.get(c);
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43
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44 long address = unsafe.allocateMemory(unsafe.addressSize());
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45 unsafe.putAddress(address, 0x0000000080000000L);
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46 // from sun.misc.Unsafe.getAddress' documentation:
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47 // "If the native pointer is less than 64 bits wide, it is
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48 // extended as an unsigned number to a Java long."
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49 result = unsafe.getAddress(address);
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50 System.out.printf("1: was 0x%x, expected 0x%x\n", result,
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51 0x0000000080000000L);
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52 for (int i = 0; i < 1000000; i++) {
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53 result = unsafe.getAddress(address);
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54 }
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55
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56 // The code has got compiled, check the result now
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57 System.out.printf("2: was 0x%x, expected 0x%x\n", result,
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58 0x0000000080000000L);
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59 if (result != 0x0000000080000000L) {
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60 System.out.println("Test Failed");
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61 System.exit(97);
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62 } else {
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63 System.out.println("Test Passed");
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64 }
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65 }
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66 static volatile long result;
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67 }
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68