1 /*
   2  * Copyright (c) 2017, 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 import java.io.File;
  26 import java.net.URL;
  27 import java.net.URLClassLoader;
  28 import sun.hotspot.WhiteBox;
  29 
  30 public class CheckCachedResolvedReferencesApp {
  31     public static void main(String args[]) throws Exception {
  32         String path = args[0];
  33         URL url = new File(path).toURI().toURL();
  34         URL[] urls = new URL[] {url};
  35 
  36         URLClassLoader loader = new URLClassLoader(urls);
  37         Class hello = loader.loadClass("Hello");
  38         System.out.println("Loaded " + hello + " from " + url + " using loader " + loader);
  39 
  40         WhiteBox wb = WhiteBox.getWhiteBox();
  41 
  42         if (!wb.areOpenArchiveHeapObjectsMapped()) {
  43             System.out.println("Archived open_archive_heap objects are not mapped.");
  44             System.out.println("This may happen during normal operation. Test Skipped.");
  45             return;
  46         }
  47 
  48         // CheckCachedResolvedReferencesApp is shared class and loaded by the
  49         // AppClassLoader. It should have cached resolved_references.
  50         if (wb.isSharedClass(CheckCachedResolvedReferencesApp.class)) {
  51             Object refs1 = wb.getResolvedReferences(CheckCachedResolvedReferencesApp.class);
  52             if (refs1 != null && wb.isShared(refs1)) {
  53                 System.out.println(
  54                     "resolved references from CheckCachedResolvedReferencesApp is cached");
  55             } else {
  56                 throw new RuntimeException(
  57                     "FAILED. CheckCachedResolvedReferencesApp has no cached resolved references");
  58             }
  59         }
  60 
  61         // Hello is shared class and loaded by the 'loader' defined in current app.
  62         // It should not have cached resolved_references.
  63         if (wb.isSharedClass(hello)) {
  64             Object refs2 = wb.getResolvedReferences(hello);
  65             if (refs2 != null) {
  66                 if (!wb.isShared(refs2)) {
  67                     System.out.println("resolved references from hello is not cached");
  68                 } else {
  69                     throw new RuntimeException(
  70                         "FAILED. Hello has unexpected cached resolved references");
  71                 }
  72             } else {
  73                 throw new RuntimeException("FAILED. Hello has no resolved references");
  74             }
  75         }
  76     }
  77 }