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comparison 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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3336:2e038ad0c1d0 3337:e6d7eed3330c
1 /*
2 * Copyright (c) 2011, 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 /**
26 * @test
27 * @bug 7041100
28 * @summary The load in String.equals intrinsic executed before null check
29 *
30 * @run main/othervm -Xbatch Test7041100 abc def
31 */
32
33 public class Test7041100 {
34
35 static String n = null;
36 public static void main(String[] args) throws Exception {
37 for (int i = 0; i < 10000; i++) {
38 stringEQ(args[0], args[1]);
39 stringEQ(args[0], args[0]);
40 stringEQ(args[0], n);
41 stringEQ(n, args[0]);
42 }
43 }
44
45 public static boolean stringEQ(String a, String b) {
46 if (a == b)
47 return true;
48 if (a == null || b == null)
49 return false;
50 else
51 return a.equals(b);
52 }
53 }