1/* 2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24/** 25 * @test 26 * @bug 8172751 27 * @summary OSR compilation at unreachable bci causes C1 crash 28 * 29 * @run main/othervm -XX:-BackgroundCompilation compiler.c1.Test8172751 30 */ 31 32package compiler.c1; 33 34import java.lang.invoke.MethodHandle; 35import java.lang.invoke.MethodHandles; 36import java.lang.invoke.MutableCallSite; 37 38public class Test8172751 { 39 private static final MethodHandle CONSTANT_TRUE = MethodHandles.constant(boolean.class, true); 40 private static final MethodHandle CONSTANT_FALSE = MethodHandles.constant(boolean.class, false); 41 private static final MutableCallSite CALL_SITE = new MutableCallSite(CONSTANT_FALSE); 42 private static final int LIMIT = 1_000_000; 43 private static volatile int counter; 44 45 private static boolean doSomething() { 46 return counter++ < LIMIT; 47 } 48 49 private static void executeLoop() { 50 /* 51 * Start off with executing the first loop, then change the call site 52 * target so as to switch over to the second loop but continue running 53 * in the first loop. Eventually, an OSR compilation of the first loop 54 * is triggered. Yet C1 will not find the OSR entry, since it will 55 * have optimized out the first loop already during parsing. 56 */ 57 if (CALL_SITE.getTarget() == CONSTANT_FALSE) { 58 int count = 0; 59 while (doSomething()) { 60 if (count++ == 1) { 61 flipSwitch(); 62 } 63 } 64 } else { 65 while (doSomething()) { 66 } 67 } 68 } 69 70 private static void flipSwitch() { 71 CALL_SITE.setTarget(CONSTANT_TRUE); 72 } 73 74 public static void main(String[] args) { 75 executeLoop(); 76 } 77} 78