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
21 * questions.
22 */
23
24/*
25 * @test
26 * @bug 8150778
27 * @summary Test exception depths, and code to get stack traces
28 * @modules java.base/jdk.internal.misc:open
29 * @modules java.base/java.lang:open
30 * @library /test/lib
31 * @run main/othervm -XX:MaxJavaStackTraceDepth=1024 TestThrowable
32 */
33
34import java.lang.reflect.Field;
35import jdk.test.lib.Asserts;
36
37public class TestThrowable {
38
39  // Inner class that throws a lot of exceptions
40  static class Thrower {
41    static int MaxJavaStackTraceDepth = 1024; // as above
42    int[] depths = {10, 34, 100, 1023, 1024, 1025};
43    int count = 0;
44
45    int getDepth(Throwable t) throws Exception {
46      Field f = Throwable.class.getDeclaredField("depth");
47      f.setAccessible(true); // it's private
48      return f.getInt(t);
49    }
50
51    void callThrow(int depth) {
52      if (++count < depth) {
53        callThrow(depth);
54      } else {
55        throw new RuntimeException("depth tested " + depth);
56      }
57    }
58    void testThrow() throws Exception {
59      for (int d : depths) {
60        try {
61          count = getDepth(new Throwable());
62          callThrow(d);
63        } catch(Exception e) {
64          e.getStackTrace();
65          System.out.println(e.getMessage());
66          int throwableDepth = getDepth(e);
67          Asserts.assertTrue(throwableDepth == d ||
68                     (d > MaxJavaStackTraceDepth && throwableDepth == MaxJavaStackTraceDepth),
69                     "depth should return the correct value: depth tested=" +
70                     d + " throwableDepth=" + throwableDepth);
71        }
72      }
73    }
74  }
75
76  public static void main(String... unused) throws Exception {
77    Thrower t = new Thrower();
78    t.testThrow();
79  }
80}
81