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 7173584
  27  * @summary arraycopy as macro node
  28  * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement TestArrayCopyMacro
  29  *
  30  */
  31 
  32 public class TestArrayCopyMacro {
  33     static class A {
  34     }
  35 
  36     // In its own method so profiling reports both branches taken
  37     static Object m2(Object o1, Object o2, int i) {
  38         if (i == 4) {
  39             return o1;
  40         }
  41         return o2;
  42     }
  43 
  44     static Object m1(A[] src, Object dest) {
  45         int i = 1;
  46 
  47         // won't be optimized out until after parsing
  48         for (; i < 3; i *= 4) {
  49         }
  50         dest = m2(new A[10], dest, i);
  51 
  52         // dest is new array here but C2 picks the "disjoint" stub
  53         // only if stub to call is decided after parsing
  54         System.arraycopy(src, 0, dest, 0, 10);
  55         return dest;
  56     }
  57 
  58     public static void main(String[] args) {
  59         A[] array_src = new A[10];
  60 
  61         for (int i = 0; i < array_src.length; i++) {
  62             array_src[i] = new A();
  63         }
  64 
  65         for (int i = 0; i < 20000; i++) {
  66             m2(null, null, 0);
  67         }
  68 
  69         for (int i = 0; i < 20000; i++) {
  70             Object[] array_dest = (Object[])m1(array_src, null);
  71 
  72             for (int j = 0; j < array_src.length; j++) {
  73                 if (array_dest[j] != array_src[j]) {
  74                     throw new RuntimeException("copy failed at index " + j + " src = " + array_src[j] + " dest = " + array_dest[j]);
  75                 }
  76             }
  77         }
  78     }
  79 }