test/compiler/7041100/Test7041100.java

/*
 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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/**
 * @test
 * @bug 7041100
 * @summary The load in String.equals intrinsic executed before null check
 *
 * @run main/othervm -Xbatch Test7041100 abc def
 */

public class Test7041100 {

    static String n = null;
    public static void main(String[] args) throws Exception {
        for (int i = 0; i < 10000; i++) {
            stringEQ(args[0], args[1]);
            stringEQ(args[0], args[0]);
            stringEQ(args[0], n);
            stringEQ(n, args[0]);
        }
    }

    public static boolean stringEQ(String a, String b) {
        if (a == b)
            return true;
        if (a == null || b == null)
            return false;
        else
            return a.equals(b);
    }
}