1 /* 2 * Copyright (c) 2013, 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 8027572 27 * @summary class unloading resets profile, method compiled after the profile is first set and before class loading sets unknown bit with not recorded class 28 * @build B 29 * @run main/othervm -XX:TypeProfileLevel=222 -XX:-BackgroundCompilation TestProfileConflictClassUnloading 30 * 31 */ 32 33 import java.net.MalformedURLException; 34 import java.net.URL; 35 import java.net.URLClassLoader; 36 import java.nio.file.Paths; 37 38 public class TestProfileConflictClassUnloading { 39 static class A { 40 } 41 42 43 static void m1(Object o) { 44 } 45 46 static void m2(Object o) { 47 m1(o); 48 } 49 50 static void m3(A a, boolean do_call) { 51 if (!do_call) { 52 return; 53 } 54 m2(a); 55 } 56 57 public static ClassLoader newClassLoader() { 58 try { 59 return new URLClassLoader(new URL[] { 60 Paths.get(System.getProperty("test.classes",".")).toUri().toURL(), 61 }, null); 62 } catch (MalformedURLException e){ 63 throw new RuntimeException("Unexpected URL conversion failure", e); 64 } 65 } 66 67 public static void main(String[] args) throws Exception { 68 ClassLoader loader = newClassLoader(); 69 Object o = loader.loadClass("B").newInstance(); 70 // collect conflicting profiles 71 for (int i = 0; i < 5000; i++) { 72 m2(o); 73 } 74 // prepare for conflict 75 A a = new A(); 76 for (int i = 0; i < 5000; i++) { 77 m3(a, false); 78 } 79 // unload class in profile 80 o = null; 81 loader = null; 82 System.gc(); 83 // record the conflict 84 m3(a, true); 85 // trigger another GC 86 System.gc(); 87 } 88 }