Mercurial > hg > truffle
diff test/compiler/7041100/Test7041100.java @ 3337: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
author | kvn |
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date | Tue, 03 May 2011 09:10:39 -0700 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/test/compiler/7041100/Test7041100.java Tue May 03 09:10:39 2011 -0700 @@ -0,0 +1,53 @@ +/* + * 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. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +/** + * @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); + } +}