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
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);
+    }
+}