1/* 2 * Copyright (c) 2017, Red Hat, Inc. 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 8174164 27 * @summary SafePointNode::_replaced_nodes breaks with irreducible loops 28 * @run main/othervm -XX:-BackgroundCompilation TestReplacedNodesOSR 29 * 30 */ 31 32public class TestReplacedNodesOSR { 33 34 static Object dummy; 35 36 static interface I { 37 } 38 39 static class A implements I { 40 } 41 42 static final class MyException extends Exception { 43 } 44 45 static final A obj = new A(); 46 static I static_field() { return obj; } 47 48 // When OSR compiled, this method has an irreducible loop 49 static void test(int v, MyException e) { 50 int i = 0; 51 for (;;) { 52 if (i == 1000) { 53 break; 54 } 55 try { 56 if ((i%2) == 0) { 57 int j = 0; 58 for (;;) { 59 j++; 60 if (i+j != v) { 61 if (j == 1000) { 62 break; 63 } 64 } else { 65 A a = (A)static_field(); 66 // replaced node recorded here 67 throw e; 68 } 69 } 70 } 71 } catch(MyException ex) { 72 } 73 i++; 74 // replaced node applied on return of the method 75 // replaced node used here 76 dummy = static_field(); 77 } 78 } 79 80 81 static public void main(String[] args) { 82 for (int i = 0; i < 1000; i++) { 83 test(1100, new MyException()); 84 } 85 } 86} 87