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 }