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 * @requires vm.flavor == "server" 29 * @requires vm.gc.Shenandoah & !vm.graal.enabled 30 * 31 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:-TieredCompilation -XX:-BackgroundCompilation -XX:-UseOnStackReplacement 32 * -XX:CompileCommand=dontinline,TestShenandoahCmpPAfterCall::not_inlined TestShenandoahCmpPAfterCall 33 * 34 */ 35 36 public class TestShenandoahCmpPAfterCall { 37 private static Object field1 = new Object(); 38 private static Object field2 = new Object(); 39 private static Object o3; 40 private static volatile int barrier; 41 42 public static void main(String[] args) { 43 for (int i = 0; i < 20_000; i++) { 44 test(); 45 } 46 } 47 48 private static void test() { 49 Object o1 = null; 50 Object o2 = field2; 51 try { 52 not_inlined(); 53 o1 = field1; 54 if (o1 == o2) { 55 56 } 57 } catch (Exception1 ex1) { 58 o1 = field1; 59 if (o1 == o2) { 60 61 } 62 } 63 barrier = 42; 64 if (o1 == o2) { 65 66 } 67 } 68 69 static int count = 0; 70 private static void not_inlined() throws Exception1 { 71 count++; 72 if ((count % 100) == 0) { 73 throw new Exception1(); 74 } 75 } 76 77 private static class Exception1 extends Exception { 78 } 79 }