| /* |
| * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 8020968 |
| * @summary Basic test for hidden frames |
| * @run main HiddenFrames |
| */ |
| |
| import java.lang.StackWalker.Option; |
| import java.lang.StackWalker.StackFrame; |
| import java.lang.reflect.Method; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.stream.Stream; |
| |
| public class HiddenFrames { |
| public static void main(String... args) throws Exception { |
| new HiddenFrames().test(); |
| new HiddenFrames(Option.SHOW_REFLECT_FRAMES).test(); |
| new HiddenFrames(Option.SHOW_HIDDEN_FRAMES).test(); |
| } |
| |
| private final Option option; |
| private final StackWalker walker; |
| private final List<StackFrame> lambdas = new ArrayList<>(); |
| private final List<StackFrame> reflects = new ArrayList<>(); |
| |
| HiddenFrames() { |
| this.option = null; |
| this.walker = StackWalker.getInstance(); |
| } |
| HiddenFrames(Option option) { |
| this.option = option; |
| this.walker = StackWalker.getInstance(option); |
| } |
| |
| void test() throws Exception { |
| walk(); |
| walkFromReflection(); |
| } |
| |
| void walk() { |
| Stream.of(0).forEach(i -> walker.walk(s -> |
| { |
| s.forEach(this::checkFrame); |
| return null; |
| })); |
| |
| // only check hidden frames but not reflection frames |
| // walk is not invoked via reflection |
| if (option == null && !lambdas.isEmpty()) { |
| throw new RuntimeException("Hidden frames are shown"); |
| } |
| |
| if (option == Option.SHOW_HIDDEN_FRAMES && lambdas.isEmpty()) { |
| throw new RuntimeException("No hidden Lambda frame"); |
| } |
| } |
| |
| void walkFromReflection() throws Exception { |
| Method m = HiddenFrames.class.getDeclaredMethod("walk"); |
| m.invoke(this); |
| |
| if (option == null && !lambdas.isEmpty()) { |
| throw new RuntimeException("Hidden frames are shown"); |
| } |
| |
| if (option == Option.SHOW_HIDDEN_FRAMES && lambdas.isEmpty()) { |
| throw new RuntimeException("No hidden Lambda frame"); |
| } |
| |
| if (option != null && reflects.isEmpty()) { |
| throw new RuntimeException("No reflection frame"); |
| } |
| } |
| |
| void checkFrame(StackFrame frame) { |
| String cn = frame.getClassName(); |
| if (cn.startsWith("java.lang.reflect.") || cn.startsWith("sun.reflect.")) { |
| reflects.add(frame); |
| } |
| if (cn.contains("$$Lambda$")) { |
| lambdas.add(frame); |
| } |
| } |
| } |