92 lines
2.9 KiB
Java
92 lines
2.9 KiB
Java
/*
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* Copyright (c) 2020, Red Hat, Inc. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 8237007 8260637
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* @summary Shenandoah: assert(_base == Tuple) failure during C2 compilation
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* @requires vm.flavor == "server"
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* @requires vm.gc.Shenandoah
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*
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* @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:-BackgroundCompilation -XX:+UseShenandoahGC LRBRightAfterMemBar
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*
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*/
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public class LRBRightAfterMemBar {
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private static A field1;
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private static Object field2;
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static volatile int barrier;
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public static void main(String[] args) {
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for (int i = 0; i < 20_000; i++) {
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test1(true, true, new Object());
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test1(false, false, new Object());
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test2(new Object(), 0, 10);
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}
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}
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private static Object test1(boolean flag, boolean flag2, Object o2) {
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for (int i = 0; i < 10; i++) {
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barrier = 0x42; // Membar
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if (o2 == null) { // hoisted out of loop
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}
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// The following line is converted to a CMove with an out
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// of loop control once the null check above is
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// hoisted. The CMove is pinned right after the membar and
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// assigned the membar as control.
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Object o = flag ? field1 : field2;
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if (flag2) {
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return o;
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}
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}
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return null;
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}
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private static int test2(Object o2, int start, int stop) {
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A a1 = null;
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A a2 = null;
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int v = 0;
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for (int i = start; i < stop; i++) {
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a2 = new A();
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a1 = new A();
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a1.a = a2;
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barrier = 0x42; // Membar
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if (o2 == null) { // hoisted out of loop
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}
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A a3 = a1.a;
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v = a3.f; // null check optimized out by EA but CastPP left in
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}
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a1.f = 0x42;
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a2.f = 0x42;
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return v;
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}
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static class A {
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A a;
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int f;
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}
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}
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