1 /*
   2  * Copyright (c) 2015, 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 
  24 /*
  25  * @test
  26  * @bug 8142303
  27  * @summary Tests handling of invalid array indices in C2 intrinsic if explicit range check in Java code is not inlined.
  28  *
  29  * @run main/othervm
  30  *      -XX:CompileCommand=inline,java.lang.String::*
  31  *      -XX:CompileCommand=inline,java.lang.StringUTF16::*
  32  *      -XX:CompileCommand=exclude,java.lang.String::checkBoundsOffCount
  33  *      compiler.intrinsics.string.TestStringConstruction
  34  */
  35 
  36 package compiler.intrinsics.string;
  37 
  38 public class TestStringConstruction {
  39 
  40     public static void main(String[] args) {
  41         char[] chars = new char[42];
  42         for (int i = 0; i < 10_000; ++i) {
  43             test(chars);
  44         }
  45     }
  46 
  47     private static String test(char[] chars) {
  48         try {
  49             // The constructor calls String::checkBoundsOffCount(-1, 42) to perform
  50             // range checks on offset and count. If this method is not inlined, C2
  51             // does not know about the explicit range checks and does not cut off the
  52             // dead code. As a result, -1 is fed as offset into the StringUTF16.compress
  53             // intrinsic which is replaced by TOP and causes a failure in the matcher.
  54             return new String(chars, -1 , 42);
  55         } catch (Exception e) {
  56             return "";
  57         }
  58     }
  59 }
  60