1 /*
   2  * Copyright (c) 2020, 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 8244663
  27  * @summary Shenandoah: C2 assertion fails in Matcher::collect_null_checks
  28  * @key gc
  29  *
  30  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:-TieredCompilation -XX:-BackgroundCompilation -XX:-UseOnStackReplacement
  31  *                   -XX:CompileCommand=dontinline,TestShenandoahCmpPAfterCall::not_inlined TestShenandoahCmpPAfterCall
  32  *
  33  */
  34 
  35 public class TestShenandoahCmpPAfterCall {
  36     private static Object field1 = new Object();
  37     private static Object field2 = new Object();
  38     private static Object o3;
  39     private static volatile int barrier;
  40 
  41     public static void main(String[] args) {
  42         for (int i = 0; i < 20_000; i++) {
  43             test();
  44         }
  45     }
  46 
  47     private static void test() {
  48         Object o1 = null;
  49         Object o2 = field2;
  50         try {
  51             not_inlined();
  52             o1 = field1;
  53             if (o1 == o2) {
  54 
  55             }
  56         } catch (Exception1 ex1) {
  57             o1 = field1;
  58             if (o1 == o2) {
  59 
  60             }
  61         }
  62         barrier = 42;
  63         if (o1 == o2) {
  64 
  65         }
  66     }
  67 
  68     static int count = 0;
  69     private static void not_inlined() throws Exception1 {
  70         count++;
  71         if ((count % 100) == 0) {
  72             throw new Exception1();
  73         }
  74     }
  75 
  76     private static class Exception1 extends Exception {
  77     }
  78 }