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annotate test/compiler/7041100/Test7041100.java @ 3337:e6d7eed3330c

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7041100: The load in String.equals intrinsic executed before null check Summary: Remove control from loads in String.equals intrinsic and cast argument to not-null. Reviewed-by: never
author kvn
date Tue, 03 May 2011 09:10:39 -0700
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e6d7eed3330c 7041100: The load in String.equals intrinsic executed before null check
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1 /*
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2 * Copyright (c) 2011, 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 /**
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26 * @test
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27 * @bug 7041100
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28 * @summary The load in String.equals intrinsic executed before null check
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29 *
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30 * @run main/othervm -Xbatch Test7041100 abc def
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31 */
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32
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33 public class Test7041100 {
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34
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35 static String n = null;
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36 public static void main(String[] args) throws Exception {
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37 for (int i = 0; i < 10000; i++) {
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38 stringEQ(args[0], args[1]);
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39 stringEQ(args[0], args[0]);
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40 stringEQ(args[0], n);
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41 stringEQ(n, args[0]);
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42 }
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43 }
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44
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45 public static boolean stringEQ(String a, String b) {
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46 if (a == b)
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47 return true;
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48 if (a == null || b == null)
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49 return false;
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50 else
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51 return a.equals(b);
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52 }
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53 }