1 /*
   2  * Copyright (c) 2021, Red Hat, Inc. 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 8261812
  27  * @summary C2 compilation fails with assert(!had_error) failed: bad dominance
  28  *
  29  * @run main/othervm -XX:-BackgroundCompilation TestValAtSafepointOverflowsInt
  30  *
  31  */
  32 
  33 public class TestValAtSafepointOverflowsInt {
  34     private static volatile int volatileField;
  35 
  36     public static void main(String[] args) {
  37         for (int i = 0; i < 20_000; i++) {
  38             testByte(true, false);
  39             testByte(false, false);
  40             testShort(true, false);
  41             testShort(false, false);
  42             testChar(true, false);
  43             testChar(false, false);
  44         }
  45         testByte(true, true);
  46         testShort(true, true);
  47         testChar(true, true);
  48     }
  49 
  50     private static Object testByte(boolean flag, boolean flag2) {
  51         int i;
  52         // loop to delay constant folding
  53         for (i = 0; i < 9; i++) {
  54         }
  55         C obj = new C();
  56         if (flag) {
  57             obj.byteField = (byte)(1 << i);
  58         } else {
  59             obj.byteField = (byte)(1 << (i+1));
  60         }
  61         // Phi for byte here for uncommon trap in never taken path below
  62         // Phi inputs don't fit in a byte. Phi transfomed to top.
  63         if (flag2) {
  64             return obj;
  65         }
  66         return null;
  67     }
  68 
  69     private static Object testShort(boolean flag, boolean flag2) {
  70         int i;
  71         for (i = 0; i < 17; i++) {
  72         }
  73         C obj = new C();
  74         if (flag) {
  75             obj.shortField = (short)(1 << i);
  76         } else {
  77             obj.shortField = (short)(1 << (i+1));
  78         }
  79         if (flag2) {
  80             return obj;
  81         }
  82         return null;
  83     }
  84 
  85     private static Object testChar(boolean flag, boolean flag2) {
  86         int i;
  87         for (i = 0; i < 17; i++) {
  88         }
  89         C obj = new C();
  90         if (flag) {
  91             obj.charField = (char)(1 << i);
  92         } else {
  93             obj.charField = (char)(1 << (i+1));
  94         }
  95         if (flag2) {
  96             return obj;
  97         }
  98         return null;
  99     }
 100 
 101 
 102     static class C {
 103         byte byteField;
 104         short shortField;
 105         char charField;
 106     }
 107 
 108 }