86 lines
2.7 KiB
Java
86 lines
2.7 KiB
Java
/*
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* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8027445
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* @summary String.equals() may be called with a length whose upper bits are not cleared
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*
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* @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation
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* compiler.intrinsics.string.TestStringEqualsBadLength
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*/
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package compiler.intrinsics.string;
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import java.util.Arrays;
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public class TestStringEqualsBadLength {
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int v1;
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int v2;
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boolean m(String s1) {
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int l = v2 - v1; // 0 - (-1) = 1. On 64 bit: 0xffffffff00000001
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char[] arr = new char[l];
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arr[0] = 'a';
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String s2 = new String(arr);
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// The string length is not reloaded but the value computed is
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// reused so pointer computation must not use
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// 0xffffffff00000001
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return s2.equals(s1);
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}
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// Same thing with String.compareTo()
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int m2(String s1) {
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int l = v2 - v1;
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char[] arr = new char[l+1];
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arr[0] = 'a';
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arr[1] = 'b';
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String s2 = new String(arr);
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return s2.compareTo(s1);
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}
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// Same thing with equals() for arrays
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boolean m3(char[] arr1) {
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int l = v2 - v1; // 0 - (-1) = 1. On 64 bit: 0xffffffff00000001
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char[] arr2 = new char[l];
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arr2[0] = 'a';
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return Arrays.equals(arr2, arr1);
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}
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static public void main(String[] args) {
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TestStringEqualsBadLength tse = new TestStringEqualsBadLength();
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tse.v1 = -1;
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tse.v2 = 0;
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char[] arr = new char[1];
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arr[0] = 'a';
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for (int i = 0; i < 20000; i++) {
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tse.m("a");
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tse.m2("ab");
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tse.m3(arr);
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}
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System.out.println("TEST PASSED");
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}
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}
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