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annotate test/compiler/intrinsics/stringequals/TestStringEqualsBadLength.java @ 13042:208ebea980f8

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8027445: SIGSEGV at TestFloatingDecimal.testAppendToDouble()I Summary: String.equals() intrinsic shouldn't use integer length input in pointer arithmetic without an i2l. Reviewed-by: kvn, twisti
author roland
date Mon, 04 Nov 2013 21:59:54 +0100
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13042
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1 /*
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2 * Copyright (c) 2013, 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
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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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
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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 8027445
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27 * @summary String.equals() may be called with a length whose upper bits are not cleared
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28 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation TestStringEqualsBadLength
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29 *
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30 */
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31
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32 import java.util.Arrays;
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33
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34 public class TestStringEqualsBadLength {
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35
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36 int v1;
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37 int v2;
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38
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39 boolean m(String s1) {
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40 int l = v2 - v1; // 0 - (-1) = 1. On 64 bit: 0xffffffff00000001
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41 char[] arr = new char[l];
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42 arr[0] = 'a';
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43 String s2 = new String(arr);
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44 // The string length is not reloaded but the value computed is
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45 // reused so pointer computation must not use
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46 // 0xffffffff00000001
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47 return s2.equals(s1);
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48 }
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49
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50 // Same thing with String.compareTo()
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51 int m2(String s1) {
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52 int l = v2 - v1;
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53 char[] arr = new char[l+1];
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54 arr[0] = 'a';
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55 arr[1] = 'b';
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56 String s2 = new String(arr);
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57 return s2.compareTo(s1);
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58 }
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59
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60 // Same thing with equals() for arrays
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61 boolean m3(char[] arr1) {
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62 int l = v2 - v1; // 0 - (-1) = 1. On 64 bit: 0xffffffff00000001
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63 char[] arr2 = new char[l];
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64 arr2[0] = 'a';
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65 return Arrays.equals(arr2, arr1);
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66 }
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67
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68 static public void main(String[] args) {
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69 TestStringEqualsBadLength tse = new TestStringEqualsBadLength();
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70 tse.v1 = -1;
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71 tse.v2 = 0;
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72 char[] arr = new char[1];
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73 arr[0] = 'a';
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74 for (int i = 0; i < 20000; i++) {
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75 tse.m("a");
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76 tse.m2("ab");
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77 tse.m3(arr);
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78 }
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79
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80 System.out.println("TEST PASSED");
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81 }
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82 }