/*

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 * 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

 * 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 8033735

 * @summary check backtrace field introspection

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

 * @run main ThrowableIntrospectionSegfault

 */

import java.lang.reflect.*;

public class ThrowableIntrospectionSegfault {

    public static void main(java.lang.String[] unused) {

        // Construct a throwable object.

        Throwable throwable = new Throwable();

        throwable.fillInStackTrace();

        // Retrieve a reflection handle to the private backtrace field.

        Class class1 = throwable.getClass();

        Field field;

        try {

            field = class1.getDeclaredField("backtrace");

        }

        catch (NoSuchFieldException e) {

            System.err.println("Can't retrieve field handle Throwable.backtrace: " + e.toString());

            return;

        }

        field.setAccessible(true);

        // Retrieve the value of the backtrace field.

        Object backtrace;

        try {

            backtrace = field.get(throwable);

        }

        catch (IllegalAccessException e) {

            System.err.println( "Can't retrieve field value for Throwable.backtrace: " + e.toString());

            return;

        }

        try {

            // Retrieve the class of throwable.backtrace[0][0].

            Class class2 = ((Object[]) ((Object[]) backtrace)[2])[0].getClass();

            // Segfault occurs while executing this line, to retrieve the name of

            // this class.

            String class2Name = class2.getName();

            System.err.println("class2Name=" + class2Name);

            return;  // pass!   Passes if it doesn't crash.

        } catch (ClassCastException e) {

            // Passes if it doesn't crash. Also if the backtrace changes this test might get

            // ClassCastException and that's ok too.

            System.out.println("Catch exception " + e);

            return;  // pass!   Passes if it doesn't crash.

        }

    }

}