1 /* 2 * Copyright (c) 2015, 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 8020968 27 * @summary Basic test for hidden frames 28 * @run main HiddenFrames 29 */ 30 31 import java.lang.StackWalker.Option; 32 import java.lang.StackWalker.StackFrame; 33 import java.lang.reflect.Method; 34 import java.util.ArrayList; 35 import java.util.List; 36 import java.util.stream.Stream; 37 38 public class HiddenFrames { 39 public static void main(String... args) throws Exception { 40 new HiddenFrames().test(); 41 new HiddenFrames(Option.SHOW_REFLECT_FRAMES).test(); 42 new HiddenFrames(Option.SHOW_HIDDEN_FRAMES).test(); 43 } 44 45 private final Option option; 46 private final StackWalker walker; 47 private final List<StackFrame> lambdas = new ArrayList<>(); 48 private final List<StackFrame> reflects = new ArrayList<>(); 49 50 HiddenFrames() { 51 this.option = null; 52 this.walker = StackWalker.getInstance(); 53 } 54 HiddenFrames(Option option) { 55 this.option = option; 56 this.walker = StackWalker.getInstance(option); 57 } 58 59 void test() throws Exception { 60 walk(); 61 walkFromReflection(); 62 } 63 64 void walk() { 65 Stream.of(0).forEach(i -> walker.walk(s -> 66 { 67 s.forEach(this::checkFrame); 68 return null; 69 })); 70 71 // only check hidden frames but not reflection frames 72 // walk is not invoked via reflection 73 if (option == null && !lambdas.isEmpty()) { 74 throw new RuntimeException("Hidden frames are shown"); 75 } 76 77 if (option == Option.SHOW_HIDDEN_FRAMES && lambdas.isEmpty()) { 78 throw new RuntimeException("No hidden Lambda frame"); 79 } 80 } 81 82 void walkFromReflection() throws Exception { 83 Method m = HiddenFrames.class.getDeclaredMethod("walk"); 84 m.invoke(this); 85 86 if (option == null && !lambdas.isEmpty()) { 87 throw new RuntimeException("Hidden frames are shown"); 88 } 89 90 if (option == Option.SHOW_HIDDEN_FRAMES && lambdas.isEmpty()) { 91 throw new RuntimeException("No hidden Lambda frame"); 92 } 93 94 if (option != null && reflects.isEmpty()) { 95 throw new RuntimeException("No reflection frame"); 96 } 97 } 98 99 void checkFrame(StackFrame frame) { 100 String cn = frame.getClassName(); 101 if (cn.startsWith("java.lang.reflect.") || cn.startsWith("sun.reflect.")) { 102 reflects.add(frame); 103 } 104 if (cn.contains("$$Lambda$")) { 105 lambdas.add(frame); 106 } 107 } 108 }