1 /*
   2  * Copyright (c) 2005, 2015, 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  * @test
  26  * @bug 8046246
  27  * @summary Tests and benchmarks the JVMTI RedefineClasses when a
  28  *          single class (and its parent) contains many methods.
  29  *
  30  * @run build ManyMethodsBenchmarkApp ManyMethodsBenchmarkAgent
  31  * @run shell MakeJAR3.sh ManyMethodsBenchmarkAgent 'Can-Retransform-Classes: true'
  32  * @run main/othervm -javaagent:ManyMethodsBenchmarkAgent.jar ManyMethodsBenchmarkApp
  33  */
  34 import java.lang.instrument.*;
  35 
  36 public class ManyMethodsBenchmarkAgent
  37 {
  38     public  static boolean fail = false;
  39     public  static boolean completed = false;
  40     private static  Instrumentation instrumentation;
  41 
  42     public static void
  43     premain(    String agentArgs,
  44                 Instrumentation instrumentation) {
  45         System.out.println("ManyMethodsBenchmarkAgent started");
  46         ManyMethodsBenchmarkAgent.instrumentation = instrumentation;
  47         System.out.println("ManyMethodsBenchmarkAgent finished");
  48     }
  49 
  50     static void instr() {
  51         System.out.println("ManyMethodsBenchmarkAgent.instr started");
  52 
  53         Class[] allClasses = instrumentation.getAllLoadedClasses();
  54 
  55         for (int i = 0; i < allClasses.length; i++) {
  56             Class klass = allClasses[i];
  57             String name = klass.getName();
  58             if (!name.equals("Base")) {
  59                 continue;
  60             }
  61             System.err.println("Instrumenting the class: " + klass);
  62 
  63             try {
  64                 instrumentation.retransformClasses(klass);
  65             } catch (Throwable e) {
  66                 System.err.println("Error: bad return from retransform: " + klass);
  67                 System.err.println("  ERROR: " + e);
  68                 fail = true;
  69             }
  70         }
  71         completed = true;
  72         System.out.println("ManyMethodsBenchmarkAgent.instr finished");
  73     }
  74 
  75 }