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 8134031
  27  * @summary Bad rewiring of memory edges when we split unique types during EA
  28  * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:CompileCommand=dontinline,TestEABadMergeMem::m_notinlined TestEABadMergeMem
  29  *
  30  */
  31 
  32 public class TestEABadMergeMem {
  33 
  34     static class Box {
  35         int i;
  36     }
  37 
  38     static void m_notinlined() {
  39     }
  40 
  41     static float dummy1;
  42     static float dummy2;
  43 
  44     static int test(Box a, Box c, int i, int j, int k, boolean flag1, boolean flag2) {
  45         Box b = new Box(); // non escaping
  46         a.i = i;
  47         b.i = j;
  48         c.i = k;
  49         
  50         m_notinlined();
  51 
  52         boolean flag3 = false;
  53         if (flag1) {
  54             for (int ii = 0; ii < 100; ii++) {
  55                 if (flag2) {
  56                     dummy1 = (float)ii;
  57                 } else {
  58                     dummy2 = (float)ii;
  59                 }
  60             }
  61             flag3 = true;
  62         }
  63         // Memory Phi here with projection of not inlined call as one edge, MergeMem as other
  64 
  65         if (flag3) { // will split through Phi during loopopts
  66             int res = c.i + b.i;
  67             m_notinlined(); // prevents split through phi during igvn
  68             return res;
  69         } else {
  70             return 44 + 43;
  71         }
  72     }
  73 
  74     static public void main(String[] args) {
  75         for (int i = 0; i < 20000; i++) {
  76             // m(2);
  77             Box a = new Box();
  78             Box c = new Box();
  79             int res = test(a, c, 42, 43, 44, (i%2) == 0, (i%3) == 0);
  80             if (res != 44 + 43) {
  81                 throw new RuntimeException("Bad result " + res);
  82             }
  83         }
  84     }
  85 
  86 }