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 8074676
  27  * @summary after guards in Arrays.copyOf() intrinsic, control may become top
  28  *
  29  * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement
  30  *                   compiler.arraycopy.TestArrayCopyOfStopped
  31  */
  32 
  33 package compiler.arraycopy;
  34 
  35 import java.util.Arrays;
  36 
  37 public class TestArrayCopyOfStopped {
  38     static class A {
  39     }
  40 
  41     static class B {
  42     }
  43 
  44     static final B[] array_of_bs = new B[10];
  45     static final A[] array_of_as = new A[10];
  46 
  47     static Object[] m1_helper(Object[] array, boolean flag) {
  48         if (flag) {
  49             return Arrays.copyOf(array, 10, A[].class);
  50         }
  51         return null;
  52     }
  53 
  54     static Object[] m1(boolean flag) {
  55         return m1_helper(array_of_bs, flag);
  56     }
  57 
  58     public static void main(String[] args) {
  59         for (int i = 0; i < 20000; i++) {
  60             m1_helper(array_of_as, (i%2) == 0);
  61         }
  62 
  63         for (int i = 0; i < 20000; i++) {
  64             m1(false);
  65         }
  66     }
  67 }