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/hs301t003/MyClass" 31 #define CLASS_NAME "Lnsk/jvmti/scenarios/hotswap/HS301/hs301t003/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 if ( ! NSK_JVMTI_VERIFY (jvmti_env->GetClassSignature(klass, &className, &generic) ) ) { 40 nsk_printf(" Agent:: Error while getting ClassFileName Signature "); 41 } else { 42 if (strcmp(className, CLASS_NAME ) == 0) { 43 int redefineNumber =0; 44 char fileName[512]; 45 nsk_jvmti_getFileName(redefineNumber, FILE_NAME, 46 fileName, sizeof(fileName)/sizeof(char)); 47 nsk_jvmti_disableNotification(jvmti_env, 48 JVMTI_EVENT_CLASS_LOAD, NULL ); 49 if (nsk_jvmti_redefineClass(jvmti_env, klass, fileName) == NSK_TRUE) { 50 nsk_printf("\n Redefine successful.\n"); 51 } else { 52 nsk_printf("\n Redefine failed.\n"); 53 } 54 } 55 } 56 } 57 58 #ifdef STATIC_BUILD 59 JNIEXPORT jint JNICALL Agent_OnLoad_hs301t003(JavaVM *jvm, char *options, void *reserved) { 60 return Agent_Initialize(jvm, options, reserved); 61 } 62 JNIEXPORT jint JNICALL Agent_OnAttach_hs301t003(JavaVM *jvm, char *options, void *reserved) { 63 return Agent_Initialize(jvm, options, reserved); 64 } 65 JNIEXPORT jint JNI_OnLoad_hs301t003(JavaVM *jvm, char *options, void *reserved) { 66 return JNI_VERSION_1_8; 67 } 68 #endif 69 jint Agent_Initialize(JavaVM *vm, char *options, void *reserved) { 70 jvmtiEnv * jvmti; 71 nsk_printf("Agent:: Agent_OnLoad.\n"); 72 if ( ! NSK_VERIFY ( JNI_OK == vm->GetEnv((void **)&jvmti, JVMTI_VERSION_1_1) ) ) { 73 nsk_printf("Agent:: Could not load JVMTI interface.\n"); 74 return JNI_ERR; 75 } else { 76 jvmtiCapabilities caps; 77 jvmtiEventCallbacks eventCallbacks; 78 if (nsk_jvmti_parseOptions(options) == NSK_FALSE ) { 79 nsk_printf("# error agent Failed to parse options.\n"); 80 return JNI_ERR; 81 } 82 memset(&caps, 0, sizeof(caps)); 83 caps.can_redefine_classes = 1; 84 caps.can_generate_all_class_hook_events=1; 85 if (! NSK_JVMTI_VERIFY (jvmti->AddCapabilities(&caps) )) { 86 nsk_printf(" Agent:: Error occured while adding capabilities.\n"); 87 return JNI_ERR; 88 } 89 memset(&eventCallbacks, 0, sizeof(eventCallbacks)); 90 eventCallbacks.ClassPrepare = &callbackClassPrepare; 91 if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks)))) { 92 nsk_printf(" Agent:: Error occured while setting event call back.\n"); 93 return JNI_ERR; 94 } 95 if ( nsk_jvmti_enableNotification(jvmti, JVMTI_EVENT_CLASS_PREPARE, NULL) == NSK_TRUE ) { 96 nsk_printf(" Agent:: Enabled notification.\n"); 97 } else { 98 nsk_printf(" Agent:: Failed to enable notification.\n"); 99 } 100 } 101 return JNI_OK; 102 } 103 }