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