1 /*
   2  * Copyright (c) 2007, 2018, 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 #include <jni.h>
  24 #include <jvmti.h>
  25 #include "agent_common.h"
  26 #include <string.h>
  27 #include "jvmti_tools.h"
  28 
  29 extern "C" {
  30 
  31 #define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS302/hs302t002/MyClass"
  32 #define CLASS_NAME "Lnsk/jvmti/scenarios/hotswap/HS302/hs302t002/MyClass;"
  33 
  34 void JNICALL callbackClassPrepare(jvmtiEnv *jvmti_env,
  35                                JNIEnv* jni_env,
  36                                jthread thread,
  37                                jclass klass) {
  38   char * className;
  39   char * generic;
  40   int redefineNumber;
  41   redefineNumber=0;
  42   jvmti_env->GetClassSignature(klass, &className, &generic);
  43   if (strcmp(className,CLASS_NAME) == 0) {
  44       char fileName[512];
  45       nsk_jvmti_disableNotification(jvmti_env, JVMTI_EVENT_CLASS_PREPARE, NULL);
  46       nsk_jvmti_getFileName(redefineNumber, FILE_NAME, fileName, sizeof(fileName)/sizeof(char));
  47       if (nsk_jvmti_redefineClass(jvmti_env, klass, fileName) == NSK_TRUE) {
  48           nsk_printf("Redefine successful ..\n");
  49       } else {
  50           nsk_printf("Redefine failed ..     \n");
  51       }
  52   }
  53 }
  54 
  55 #ifdef STATIC_BUILD
  56 JNIEXPORT jint JNICALL Agent_OnLoad_hs302t002(JavaVM *jvm, char *options, void *reserved) {
  57     return Agent_Initialize(jvm, options, reserved);
  58 }
  59 JNIEXPORT jint JNICALL Agent_OnAttach_hs302t002(JavaVM *jvm, char *options, void *reserved) {
  60     return Agent_Initialize(jvm, options, reserved);
  61 }
  62 JNIEXPORT jint JNI_OnLoad_hs302t002(JavaVM *jvm, char *options, void *reserved) {
  63     return JNI_VERSION_1_8;
  64 }
  65 #endif
  66 jint  Agent_Initialize(JavaVM *vm, char *options, void *reserved) {
  67     jint rc ;
  68     jvmtiEnv * jvmti;
  69 
  70     nsk_printf("Agent:: VM.. Started..\n");
  71     rc=vm->GetEnv((void **)&jvmti, JVMTI_VERSION_1_1);
  72     if (rc != JNI_OK) {
  73         nsk_printf("Agent:: Could not load JVMTI interface \n");
  74         return JNI_ERR;
  75     } else {
  76         jvmtiCapabilities caps;
  77         jvmtiEventCallbacks eventCallbacks;
  78 
  79         if (nsk_jvmti_parseOptions(options) == NSK_FALSE) {
  80             nsk_printf("# error agent Failed to parse options \n");
  81             return JNI_ERR;
  82         }
  83 
  84         memset(&caps, 0, sizeof(caps));
  85         caps.can_redefine_classes = 1;
  86         caps.can_generate_all_class_hook_events=1;
  87         jvmti->AddCapabilities(&caps);
  88         memset(&eventCallbacks, 0, sizeof(eventCallbacks));
  89         eventCallbacks.ClassPrepare = &callbackClassPrepare;
  90         rc=jvmti->SetEventCallbacks(&eventCallbacks,
  91                 sizeof(eventCallbacks));
  92 
  93         if (rc != JVMTI_ERROR_NONE) {
  94             nsk_printf(" Agent:: Error occured while setting event call back \n");
  95             return JNI_ERR;
  96         }
  97         if (nsk_jvmti_enableNotification(jvmti, JVMTI_EVENT_CLASS_PREPARE,
  98                     NULL) == NSK_TRUE) {
  99             nsk_printf(" Enabled. noftification..");
 100         } else {
 101             nsk_printf(" Failed to Enable ..");
 102         }
 103     }
 104     return JNI_OK;
 105 }
 106 
 107 }