/*

 * Copyright (c) 2016, 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.

 *

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 */

/*

 * @test

 * @bug 8150778

 * @summary Test exception depths, and code to get stack traces

 * @modules java.base/jdk.internal.misc

 * @library /testlibrary

 * @run main/othervm -XX:MaxJavaStackTraceDepth=1024 TestThrowable

 */

import java.lang.reflect.Field;

import jdk.test.lib.Asserts;

public class TestThrowable {

  // Inner class that throws a lot of exceptions

  static class Thrower {

    static int MaxJavaStackTraceDepth = 1024; // as above

    int[] depths = {10, 34, 100, 1024, 2042};

    int count = 0;

    int getDepth(Throwable t) throws Exception {

      Field f = Throwable.class.getDeclaredField("depth");

      f.setAccessible(true); // it's private

      return f.getInt(t);

    }

    void callThrow(int depth) {

      if (++count < depth) {

        callThrow(depth);

      } else {

        throw new RuntimeException("depth tested " + depth);

      }

    }

    void testThrow() throws Exception {

      for (int d : depths) {

        try {

          count = getDepth(new Throwable());

          callThrow(d);

        } catch(Exception e) {

          e.getStackTrace();

          System.out.println(e.getMessage());

          int throwableDepth = getDepth(e);

          Asserts.assertTrue(throwableDepth == d ||

                     (d > MaxJavaStackTraceDepth && throwableDepth == MaxJavaStackTraceDepth),

                     "depth should return the correct value: depth tested=" +

                     d + " throwableDepth=" + throwableDepth);

        }

      }

    }

  }

  public static void main(String... unused) throws Exception {

    Thrower t = new Thrower();

    t.testThrow();

  }

}