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 
  24 #include <jni.h>
  25 #include <jvmti.h>
  26 #include "agent_common.h"
  27 #include <string.h>
  28 #include "jvmti_tools.h"
  29 #include "jni_tools.h"
  30 extern "C" {
  31 
  32 #define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS301/hs301t001/MyClass"
  33 #define DIR_NAME "newclass"
  34 #define PATH_FORMAT "%s%02d/%s"
  35 #define SEARCH_NAME "nsk/jvmti/scenarios/hotswap/HS301/hs301t001/MyClass"
  36 #define CLASS_NAME "Lnsk/jvmti/scenarios/hotswap/HS301/hs301t001/MyClass;"
  37 static jvmtiEnv * jvmti;
  38 
  39 #ifdef STATIC_BUILD
  40 JNIEXPORT jint JNICALL Agent_OnLoad_hs301t001(JavaVM *jvm, char *options, void *reserved) {
  41     return Agent_Initialize(jvm, options, reserved);
  42 }
  43 JNIEXPORT jint JNICALL Agent_OnAttach_hs301t001(JavaVM *jvm, char *options, void *reserved) {
  44     return Agent_Initialize(jvm, options, reserved);
  45 }
  46 JNIEXPORT jint JNI_OnLoad_hs301t001(JavaVM *jvm, char *options, void *reserved) {
  47     return JNI_VERSION_1_8;
  48 }
  49 #endif
  50 jint  Agent_Initialize(JavaVM *vm, char *options, void *reserved) {
  51     nsk_printf("Agent:: Agent_OnLoad .\n");
  52     if ( ! NSK_VERIFY ( JNI_OK == vm->GetEnv((void **)&jvmti, JVMTI_VERSION_1_1) ) ) {
  53         nsk_printf("Agent:: Could not load JVMTI interface.\n");
  54         return JNI_ERR;
  55     } else {
  56         jvmtiCapabilities caps;
  57         jvmtiEventCallbacks eventCallbacks;
  58         if (nsk_jvmti_parseOptions(options) == NSK_FALSE ) {
  59             nsk_printf("# error agent Failed to parse options.\n");
  60             return JNI_ERR;
  61         }
  62         memset(&caps, 0, sizeof(caps));
  63         caps.can_redefine_classes = 1;
  64         if (! NSK_JVMTI_VERIFY (jvmti->AddCapabilities(&caps) )) {
  65             nsk_printf(" Agent:: Error occured while adding capabilities.\n");
  66             return JNI_ERR;
  67         }
  68         memset(&eventCallbacks, 0, sizeof(eventCallbacks));
  69         if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks)))) {
  70             nsk_printf(" Agent:: Error occured while setting event call back.\n");
  71             return JNI_ERR;
  72         }
  73     }
  74     return JNI_OK;
  75 }
  76 
  77 JNIEXPORT jboolean JNICALL
  78 Java_nsk_jvmti_scenarios_hotswap_HS301_hs301t001_hs301t001_redefine(JNIEnv * jni, jobject jboj) {
  79     jclass cls;
  80     jboolean ret;
  81     char fileName[512];
  82     int redefineNumber;
  83 
  84 
  85     redefineNumber=0;
  86     cls = jni->FindClass(SEARCH_NAME);
  87     if (! NSK_JNI_VERIFY(jni, cls != NULL) ) {
  88         nsk_printf("Agent:: (*JNI)->FindClass(jni, %s) returns `null`.\n",SEARCH_NAME);
  89         return NSK_FALSE;
  90     }
  91     ret = JNI_FALSE;
  92     nsk_jvmti_getFileName(redefineNumber, FILE_NAME, fileName, sizeof(fileName)/sizeof(char));
  93     if ( nsk_jvmti_redefineClass(jvmti, cls, fileName) == NSK_TRUE ) {
  94         nsk_printf("Agent:: Redefine successful.\n");
  95         ret = JNI_TRUE;
  96     } else {
  97         nsk_printf("#error Agent :: Redefine failed.\n");
  98     }
  99     return ret;
 100 }
 101 
 102 }