| /* |
| * Copyright (c) 2016, 2018, Red Hat, Inc. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /** |
| * @test TestNullCheck |
| * @summary implicit null check on brooks pointer must not cause crash |
| * @key gc |
| * @requires vm.gc.Shenandoah & !vm.graal.enabled & (vm.bits == "64") |
| * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:-TieredCompilation |
| * -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC |
| * -Xmx4G -XX:HeapBaseMinAddress=0x800000000 TestNullCheck |
| */ |
| |
| // HeapBaseMinAddress above forces compressed oops with a base |
| |
| public class TestNullCheck { |
| |
| int f; |
| |
| static int test1(TestNullCheck o) { |
| return o.f; |
| } |
| |
| static TestNullCheck static_obj = new TestNullCheck(); |
| |
| static int test2() { |
| return static_obj.f; |
| } |
| |
| static public void main(String[] args) { |
| TestNullCheck o = new TestNullCheck(); |
| for (int i = 0; i < 20000; i++) { |
| test1(o); |
| test2(); |
| } |
| try { |
| test1(null); |
| } catch (NullPointerException npe) {} |
| static_obj = null; |
| try { |
| test2(); |
| } catch (NullPointerException npe) {} |
| } |
| } |
