jdk8-mips64-public/hotspot: test/compiler/7041100/Test7041100.java@e6d7eed3330c

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

     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  */

    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  */

    33 public class Test7041100 {

    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     }

    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 }

Mercurial > jdk8-mips64-public > hotspot / file revision

test/compiler/7041100/Test7041100.java@e6d7eed3330c

test/compiler/7041100/Test7041100.java