78 lines
2.7 KiB
Java
78 lines
2.7 KiB
Java
/*
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* Copyright (c) 2017, 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 8172751
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* @summary OSR compilation at unreachable bci causes C1 crash
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*
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* @run main/othervm -XX:-BackgroundCompilation compiler.c1.Test8172751
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*/
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package compiler.c1;
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MutableCallSite;
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public class Test8172751 {
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private static final MethodHandle CONSTANT_TRUE = MethodHandles.constant(boolean.class, true);
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private static final MethodHandle CONSTANT_FALSE = MethodHandles.constant(boolean.class, false);
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private static final MutableCallSite CALL_SITE = new MutableCallSite(CONSTANT_FALSE);
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private static final int LIMIT = 1_000_000;
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private static volatile int counter;
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private static boolean doSomething() {
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return counter++ < LIMIT;
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}
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private static void executeLoop() {
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/*
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* Start off with executing the first loop, then change the call site
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* target so as to switch over to the second loop but continue running
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* in the first loop. Eventually, an OSR compilation of the first loop
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* is triggered. Yet C1 will not find the OSR entry, since it will
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* have optimized out the first loop already during parsing.
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*/
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if (CALL_SITE.getTarget() == CONSTANT_FALSE) {
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int count = 0;
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while (doSomething()) {
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if (count++ == 1) {
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flipSwitch();
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}
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}
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} else {
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while (doSomething()) {
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}
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}
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}
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private static void flipSwitch() {
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CALL_SITE.setTarget(CONSTANT_TRUE);
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}
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public static void main(String[] args) {
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executeLoop();
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}
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}
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