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 8015436 27 * @summary the IK _initial_method_idnum value must be adjusted if overpass methods are added 28 * @library /test/lib / 29 * @modules java.base/jdk.internal.misc 30 * @build compiler.runtime.cr8015436.Test8015436 31 * 32 * @run driver compiler.runtime.cr8015436.Driver8015436 33 */ 34 35/* 36 * The test checks that a MemberName for the defaultMethod() is cached in 37 * the class MemberNameTable without a crash in the VM fastdebug mode. 38 * The original issue was that the InstanceKlass _initial_method_idnum was 39 * not adjusted properly when the overpass methods are added to the class. 40 * The expected/correct behavior: The test does not crash nor throw any exceptions. 41 * All the invocations of the defaultMethod() must be completed successfully. 42 */ 43 44package compiler.runtime.cr8015436; 45 46import java.lang.invoke.MethodHandle; 47import java.lang.invoke.MethodHandles; 48import java.lang.invoke.MethodType; 49 50public class Test8015436 implements InterfaceWithDefaultMethod { 51 public static final String SOME_MTD_INVOKED = "someMethod() invoked"; 52 public static final String DEFAULT_MTD_INVOKED_DIRECTLY = "defaultMethod() invoked directly"; 53 public static final String DEFAULT_MTD_INVOKED_MH = "defaultMethod() invoked via a MethodHandle"; 54 55 @Override 56 public void someMethod() { 57 System.out.println(SOME_MTD_INVOKED); 58 } 59 60 public static void main(String[] args) throws Throwable { 61 Test8015436 testObj = new Test8015436(); 62 testObj.someMethod(); 63 testObj.defaultMethod(DEFAULT_MTD_INVOKED_DIRECTLY); 64 65 MethodHandles.Lookup lookup = MethodHandles.lookup(); 66 MethodType mt = MethodType.methodType(void.class, String.class); 67 MethodHandle mh = lookup.findVirtual(Test8015436.class, "defaultMethod", mt); 68 mh.invokeExact(testObj, DEFAULT_MTD_INVOKED_MH); 69 } 70} 71 72interface InterfaceWithDefaultMethod { 73 public void someMethod(); 74 75 default public void defaultMethod(String str){ 76 System.out.println(str); 77 } 78} 79/* 80 * A successful execution gives the output: 81 * someMethod() invoked 82 * defaultMethod() invoked directly 83 * defaultMethod() invoked via a MethodHandle 84 */ 85