1 /*
2  * Copyright (c) 2016, 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
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22  */
23 
24 /*
25  * @test
26  * @bug 8157892 8157977
27  * @summary Verify file name, line number and bci of native methods
28  * @run main NativeMethod
29  */
30 
31 import java.lang.StackWalker.Option;
32 import java.lang.StackWalker.StackFrame;
33 import java.lang.reflect.Method;
34 import java.util.List;
35 import java.util.stream.Collectors;
36 
37 public class NativeMethod {
main(String... args)38     public static void main(String... args) throws Exception {
39         new NativeMethod().test();
40     }
41 
42     private final StackWalker walker;
NativeMethod()43     NativeMethod() {
44         this.walker = StackWalker.getInstance(Option.SHOW_REFLECT_FRAMES);
45     }
46 
test()47     void test() throws Exception {
48         // invoke via reflection that includes native methods
49         Method m = NativeMethod.class.getDeclaredMethod("walk");
50         m.invoke(this);
51     }
52 
walk()53     void walk() {
54         List<StackFrame> nativeFrames = walker.walk(s ->
55             s.filter(StackFrame::isNativeMethod)
56              .collect(Collectors.toList())
57         );
58 
59         assertTrue(nativeFrames.size() > 0, "native frame not found");
60         for (StackFrame f : nativeFrames) {
61             assertTrue(f.getFileName() != null, "source file expected to be found");
62             assertTrue(f.getLineNumber() < 0, "line number expected to be unavailable");
63             assertTrue(f.getByteCodeIndex() < 0, "bci expected to be unavailable");
64         }
65 
66     }
67 
68     private static void assertTrue(boolean value, String msg) {
69         if (value != true)
70             throw new AssertionError(msg);
71     }
72 }
73