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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 *

 * 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 8087315

 * @summary Get old method's stack trace elements after GC

 * @library /testlibrary

 * @modules java.compiler

 *          java.instrument

 *          jdk.jartool/sun.tools.jar

 * @build RedefineClassHelper

 * @run main RedefineClassHelper

 * @run main/othervm -javaagent:redefineagent.jar RedefineRunningMethodsWithBacktrace

 */

import static jdk.test.lib.Asserts.*;

public class RedefineRunningMethodsWithBacktrace {

    public static String newB =

                "class RedefineRunningMethodsWithBacktrace$B {" +

                "   static int count1 = 0;" +

                "   static int count2 = 0;" +

                "   public static volatile boolean stop = false;" +

                "  static void localSleep() { " +

                "    try{ " +

                "      Thread.currentThread().sleep(10);" +

                "    } catch(InterruptedException ie) { " +

                "    } " +

                " } " +

                "   public static void infinite() { " +

                "       System.out.println(\"infinite called\");" +

                "   }" +

                "   public static void throwable() { " +

                "       throw new RuntimeException(\"throwable called\");" +

                "   }" +

                "}";

    public static String evenNewerB =

                "class RedefineRunningMethodsWithBacktrace$B {" +

                "   static int count1 = 0;" +

                "   static int count2 = 0;" +

                "   public static volatile boolean stop = false;" +

                "  static void localSleep() { " +

                "    try{ " +

                "      Thread.currentThread().sleep(1);" +

                "    } catch(InterruptedException ie) { " +

                "    } " +

                " } " +

                "   public static void infinite() { }" +

                "   public static void throwable() { " +

                "       throw new RuntimeException(\"throwable called\");" +

                "   }" +

                "}";

    static class B {

        static int count1 = 0;

        static int count2 = 0;

        public static volatile boolean stop = false;

        static void localSleep() {

            try {

                Thread.currentThread().sleep(10);//sleep for 10 ms

            } catch(InterruptedException ie) {

            }

        }

        public static void infinite() {

            while (!stop) { count1++; localSleep(); }

        }

        public static void throwable() {

            // add some stuff to the original constant pool

            String s1 = new String ("string1");

            String s2 = new String ("string2");

            String s3 = new String ("string3");

            String s4 = new String ("string4");

            String s5 = new String ("string5");

            String s6 = new String ("string6");

            String s7 = new String ("string7");

            String s8 = new String ("string8");

            String s9 = new String ("string9");

            String s10 = new String ("string10");

            String s11 = new String ("string11");

            String s12 = new String ("string12");

            String s13 = new String ("string13");

            String s14 = new String ("string14");

            String s15 = new String ("string15");

            String s16 = new String ("string16");

            String s17 = new String ("string17");

            String s18 = new String ("string18");

            String s19 = new String ("string19");

            throw new RuntimeException("throwable called");

        }

    }

    private static void touchRedefinedMethodInBacktrace(Throwable throwable) {

        System.out.println("touchRedefinedMethodInBacktrace: ");

        throwable.printStackTrace();  // this actually crashes with the bug in

                                      // java_lang_StackTraceElement::create()

        // Make sure that we can convert the backtrace, which is referring to

        // the redefined method, to a  StrackTraceElement[] without crashing.

        StackTraceElement[] stackTrace = throwable.getStackTrace();

        for (int i = 0; i < stackTrace.length; i++) {

            StackTraceElement frame = stackTrace[i];

            assertNotNull(frame.getClassName(),

              "\nTest failed: trace[" + i + "].getClassName() returned null");

            assertNotNull(frame.getMethodName(),

              "\nTest failed: trace[" + i + "].getMethodName() returned null");

        }

    }

    private static Throwable getThrowableInB() {

        Throwable t = null;

        try {

            B.throwable();

        } catch (Exception e) {

            t = e;

            // Don't print here because Throwable will cache the constructed stacktrace

            // e.printStackTrace();

        }

        return t;

    }

    public static void main(String[] args) throws Exception {

        new Thread() {

            public void run() {

                B.infinite();

            }

        }.start();

        Throwable t1 = getThrowableInB();

        RedefineClassHelper.redefineClass(B.class, newB);

        System.gc();

        Throwable t2 = getThrowableInB();

        B.infinite();

        for (int i = 0; i < 20 ; i++) {

            String s = new String("some garbage");

            System.gc();

        }

        RedefineClassHelper.redefineClass(B.class, evenNewerB);

        System.gc();

        Throwable t3 = getThrowableInB();

        for (int i = 0; i < 20 ; i++) {

            B.infinite();

            String s = new String("some garbage");

            System.gc();

        }

        touchRedefinedMethodInBacktrace(t1);

        touchRedefinedMethodInBacktrace(t2);

        touchRedefinedMethodInBacktrace(t3);

        // purge should clean everything up.

        B.stop = true;

        for (int i = 0; i < 20 ; i++) {

            B.infinite();

            String s = new String("some garbage");

            System.gc();

        }

    }

}