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/*
* Copyright (c) 2015, 2023, 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("jdk.internal.reflect.")) {
reflects.add(frame);
}
if (cn.contains("$$Lambda")) {
lambdas.add(frame);
}
}
}
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