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 #define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS301/hs301t004/MyClass"
  31 #define CLASS_NAME "Lnsk/jvmti/scenarios/hotswap/HS301/hs301t004/MyClass;"
  32 
  33 void JNICALL callbackClassPrepare(jvmtiEnv *jvmti_env,
  34                                JNIEnv* jni_env,
  35                                jthread thread,
  36                                jclass klass) {
  37     char * className;
  38     char * generic;
  39     int redefineNumber=0;
  40     if (! NSK_JVMTI_VERIFY( NSK_CPP_STUB4(GetClassSignature,
  41                     jvmti_env, klass, &className, &generic)) ) {
  42         nsk_printf(" Agent :: Error occured in getting class signature.\n");
  43         return;
  44     } else {
  45         if (strcmp(className, CLASS_NAME) == 0) {
  46             int redefineNumber =0;
  47             char fileName[512];
  48             nsk_jvmti_disableNotification(jvmti_env, JVMTI_EVENT_CLASS_PREPARE, NULL );
  49             nsk_jvmti_getFileName(redefineNumber, FILE_NAME, fileName,
  50                     sizeof(fileName)/sizeof(char));
  51             if (nsk_jvmti_redefineClass(jvmti_env, klass, fileName)  == NSK_TRUE ) {
  52                 nsk_printf("Agent:: Redefine successful.\n");
  53             } else {
  54                 nsk_printf("Agent:: Redefine failed.\n");
  55             }
  56         }
  57     }
  58 }
  59 
  60 #ifdef STATIC_BUILD
  61 JNIEXPORT jint JNICALL Agent_OnLoad_hs301t004(JavaVM *jvm, char *options, void *reserved) {
  62     return Agent_Initialize(jvm, options, reserved);
  63 }
  64 JNIEXPORT jint JNICALL Agent_OnAttach_hs301t004(JavaVM *jvm, char *options, void *reserved) {
  65     return Agent_Initialize(jvm, options, reserved);
  66 }
  67 JNIEXPORT jint JNI_OnLoad_hs301t004(JavaVM *jvm, char *options, void *reserved) {
  68     return JNI_VERSION_1_8;
  69 }
  70 #endif
  71 jint  Agent_Initialize(JavaVM *vm, char *options, void *reserved) {
  72     jvmtiEnv * jvmti;
  73     nsk_printf("Agent:: VM Started.\n");
  74     if (! NSK_VERIFY ( JNI_OK == NSK_CPP_STUB3(GetEnv,
  75                     vm, (void **)&jvmti, JVMTI_VERSION_1_1) ) ) {
  76         nsk_printf("Agent:: Could not load JVMTI interface \n");
  77         return JNI_ERR;
  78     } else {
  79         jvmtiCapabilities caps;
  80         jvmtiEventCallbacks eventCallbacks;
  81         if (nsk_jvmti_parseOptions(options) == NSK_FALSE ) {
  82             nsk_printf("# error agent Failed to parse options \n");
  83             return JNI_ERR;
  84         }
  85         memset(&caps, 0, sizeof(caps));
  86         caps.can_redefine_classes = 1;
  87         caps.can_generate_all_class_hook_events=1;
  88         if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB2(AddCapabilities,
  89                         jvmti, &caps) ))  {
  90             nsk_printf(" Agent:: Error occured while adding capabilities.\n");
  91             return JNI_ERR;
  92         }
  93         memset(&eventCallbacks, 0, sizeof(eventCallbacks));
  94         eventCallbacks.ClassPrepare = &callbackClassPrepare;
  95         if ( ! NSK_JVMTI_VERIFY( NSK_CPP_STUB3(SetEventCallbacks,
  96                         jvmti, &eventCallbacks, sizeof(eventCallbacks)) ) ) {
  97             nsk_printf(" Agent:: Error occured while setting event call back \n");
  98             return JNI_ERR;
  99         }
 100         if ( nsk_jvmti_enableNotification(jvmti, JVMTI_EVENT_CLASS_PREPARE, NULL) == NSK_TRUE ) {
 101             nsk_printf(" Enabled notification.\n");
 102         } else {
 103             nsk_printf(" Failed to enable notifications.\n");
 104         }
 105     }
 106     return JNI_OK;
 107 }
 108 
 109 }