56 lines
2.1 KiB
Java
56 lines
2.1 KiB
Java
/*
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* Copyright (c) 2022, Oracle and/or its affiliates. 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 8287432
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* @summary Test removal of precedence edge of MemBarAcquire together with other now dead input nodes which visits a
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* top node. This resulted in a crash before as it disconnected top from the graph which is unexpected.
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*
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* @run main/othervm -Xbatch compiler.c2.TestRemoveMemBarPrecEdge
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*/
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package compiler.c2;
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public class TestRemoveMemBarPrecEdge {
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static boolean flag = false;
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public static void main(String[] args) {
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for (int i = 0; i < 10000; i++) {
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test();
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flag = !flag;
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}
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}
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public static void test() {
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// currentThread() is intrinsified and C2 emits a special AddP node with a base that is top.
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Thread t = Thread.currentThread();
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// getName() returns the volatile _name field. The method is inlined and we just emit a LoadN + DecodeN which
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// is a precedence edge input into both MemBarAcquire nodes below for the volatile field _name.
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if (flag) {
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t.getName();
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} else {
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t.getName();
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}
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}
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}
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