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 #include "JVMTITools.h"
  29 #include "jni_tools.h"
  30 
  31 extern "C" {
  32 
  33 #define DIR_NAME "newclass"
  34 #define PATH_FORMAT "%s%02d/%s"
  35 #define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS104/hs104t002/MyThread"
  36 #define SEARCH_NAME "nsk/jvmti/scenarios/hotswap/HS104/hs104t002/MyThread"
  37 
  38 static jvmtiEnv * jvmti;
  39 
  40 #ifdef STATIC_BUILD
  41 JNIEXPORT jint JNICALL Agent_OnLoad_hs104t002(JavaVM *jvm, char *options, void *reserved) {
  42     return Agent_Initialize(jvm, options, reserved);
  43 }
  44 JNIEXPORT jint JNICALL Agent_OnAttach_hs104t002(JavaVM *jvm, char *options, void *reserved) {
  45     return Agent_Initialize(jvm, options, reserved);
  46 }
  47 JNIEXPORT jint JNI_OnLoad_hs104t002(JavaVM *jvm, char *options, void *reserved) {
  48     return JNI_VERSION_1_8;
  49 }
  50 #endif
  51 jint  Agent_Initialize(JavaVM *vm, char *options, void *reserved){
  52     if ( ! NSK_VERIFY ( JNI_OK == vm->GetEnv((void **)&jvmti, JVMTI_VERSION_1_1) ) ) {
  53         nsk_printf("#error Agent :: Could not load JVMTI interface.\n");
  54         return JNI_ERR;
  55     } else {
  56         jvmtiCapabilities caps;
  57         if (nsk_jvmti_parseOptions(options) == NSK_FALSE ) {
  58             nsk_printf("# error agent Failed to parse options \n");
  59             return JNI_ERR;
  60         }
  61         memset(&caps, 0, sizeof(caps));
  62         caps.can_redefine_classes = 1;
  63         if (! NSK_JVMTI_VERIFY ( jvmti->AddCapabilities(&caps) )) {
  64             nsk_printf("#error Agent :: occured while adding capabilities.\n");
  65             return JNI_ERR;
  66         }
  67     }
  68     return JNI_OK;
  69 }
  70 
  71 JNIEXPORT void JNICALL
  72 Java_nsk_jvmti_scenarios_hotswap_HS104_hs104t002_hs104t002_redefineClasses(
  73     JNIEnv *jni, jclass classObject) {
  74     jclass cla;
  75     char fileName[512];
  76 
  77     if ( ! NSK_JNI_VERIFY(jni, ( cla = jni->FindClass(SEARCH_NAME) ) != NULL ) ) {
  78         nsk_printf(" Agent :: Failed to get class.\n");
  79         nsk_jvmti_agentFailed();
  80         return;
  81     }
  82     nsk_jvmti_getFileName(0, FILE_NAME, fileName,
  83             sizeof(fileName)/sizeof(char));
  84     if ( nsk_jvmti_redefineClass( jvmti, cla, fileName) == NSK_TRUE ) {
  85         nsk_printf(" Agent :: Redefine successfull.\n");
  86     } else {
  87         nsk_printf("# error Agent :: Redefine failed.\n");
  88         nsk_jvmti_agentFailed();
  89     }
  90 }
  91 
  92 }