--- /dev/null 2015-11-19 07:55:48.341560974 +0100 +++ new/test/compiler/intrinsics/string/TestStringConstruction.java 2015-11-19 18:00:08.584045300 +0100 @@ -0,0 +1,52 @@ +/* + * Copyright (c) 2015, 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 8142303 + * @summary Tests handling of invalid array indices in C2 intrinsic if explicit range check in Java code is not inlined. + * @run main/othervm -XX:CompileCommand=inline,java.lang.String::* -XX:CompileCommand=inline,java.lang.StringUTF16::* -XX:CompileCommand=exclude,java.lang.String::checkBoundsOffCount TestStringConstruction + */ +public class TestStringConstruction { + + public static void main(String[] args) { + char[] chars = new char[42]; + for (int i = 0; i < 10_000; ++i) { + test(chars); + } + } + + private static String test(char[] chars) { + try { + // The constructor calls String::checkBoundsOffCount(-1, 42) to perform + // range checks on offset and count. If this method is not inlined, C2 + // does not know about the explicit range checks and does not cut off the + // dead code. As a result, -1 is fed as offset into the StringUTF16.compress + // intrinsic which is replaced by TOP and causes a failure in the matcher. + return new String(chars, -1 , 42); + } catch (Exception e) { + return ""; + } + } +} +