russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
69 lines
2.4 KiB
Java
69 lines
2.4 KiB
Java
/*
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* Copyright (c) 2025, 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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* @summary Test that C1 respects that static initializers can have memory side effects.
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* @bug 8357782
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* @requires vm.compiler1.enabled
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* @comment Since static initializers only execute in the first execution of the class initializer, we need -Xcomp.
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* @run main/othervm -Xcomp -XX:TieredStopAtLevel=1 -XX:CompileCommand=compileonly,compiler/c1/A$B.test compiler.c1.TestStaticInitializerSideEffect
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*/
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package compiler.c1;
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public class TestStaticInitializerSideEffect {
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public static void main(String[] args) {
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A.B.test();
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}
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}
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class A {
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static class B {
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static String field;
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static void test() {
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// This unused variable triggers local value numbering to remove
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// the field load in the constructor below if it is not killed
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// before.
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String tmp = field;
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// The class initializer of C should kill the LVN effect of tmp due
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// to the memory side effects of the static initializer.
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new C(field);
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}
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}
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static class C {
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// When executing the class initializer, this has a side effect.
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static {
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B.field = "Hello";
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}
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C(String val) {
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// If C1 does not respect that side effect, we crash here.
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if (val == null) {
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throw new RuntimeException("Should not reach here");
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}
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}
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}
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}
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