/*

 * Copyright (c) 2019, Red Hat, Inc. 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 8216302

 * @summary Check that stack trace contains proper strings even with class caching

 * @modules java.base/java.lang:open

 * @compile StackTraceClassCache.java

 * @run main StackTraceClassCache

 */

import java.lang.reflect.*;

public class StackTraceClassCache  {

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

        Outer.Inner o = new Outer().new Inner();

        Class cl = o.getClass();

        // Check out of the box class name

        try {

            o.work();

        } catch (Exception e) {

            checkException(e, 42);

        }

        // Clear and populate class caches via getName

        clearNameCache(cl);

        cl.getName();

        try {

            o.work();

        } catch (Exception e) {

            checkException(e, 51);

        }

        // Clear and populate class caches via stack trace

        clearNameCache(cl);

        try {

            o.work();

        } catch (Exception e) {

            checkException(e, 59);

        }

    }

    static void checkException(Exception e, int line) throws Exception {

        StackTraceElement[] fs = e.getStackTrace();

        if (fs.length < 2) {

            throw new IllegalStateException("Exception should have at least two frames", e);

        }

        assertCorrect("StackTraceClassCache$Outer$Inner.work(StackTraceClassCache.java:95)", fs[0].toString(), e);

        assertCorrect("StackTraceClassCache.main(StackTraceClassCache.java:" + line + ")",   fs[1].toString(), e);

    }

    static void assertCorrect(String expected, String actual, Exception e) throws Exception {

        if (!expected.equals(actual)) {

            throw new IllegalStateException("Expected: " + expected + "; Actual: " + actual, e);

        }

    }

    static void clearNameCache(Class cl) {

        try {

            Field f = Class.class.getDeclaredField("name");

            f.setAccessible(true);

            f.set(cl, null);

        } catch (Exception e) {

            throw new IllegalStateException(e);

        }

    }

    static class Outer {

       class Inner {

           void work() throws Exception {

               throw new Exception("Sample exception");

           }

       }

    }

}