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 <stdio.h> 24 #include <stdlib.h> 25 #include <string.h> 26 #include <jni.h> 27 #include <jvmti.h> 28 #include <aod.h> 29 #include <jvmti_aod.h> 30 31 extern "C" { 32 33 /* 34 * Expected agent work scenario: 35 * - during initialization agent enables events VMObjectAlloc 36 * - agent receives VMObjectAlloc event for instance of InterruptedException, 37 * redefines class InterruptedException and finishes work 38 */ 39 40 #define REDEFINED_CLASS_NAME "Ljava/lang/InterruptedException;" 41 #define REDEFINED_CLASS_FILE_NAME "java/lang/InterruptedException" 42 43 static Options* options = NULL; 44 static const char* agentName; 45 46 static jvmtiEvent testEvents[] = {JVMTI_EVENT_VM_OBJECT_ALLOC}; 47 48 static const int testEventsNumber = 1; 49 50 void JNICALL vmObjectAllocHandler(jvmtiEnv * jvmti, 51 JNIEnv * jni, 52 jthread thread, 53 jobject object, 54 jclass object_class, 55 jlong size) { 56 char className[MAX_STRING_LENGTH]; 57 58 if (!nsk_jvmti_aod_getClassName(jvmti, object_class, className)) { 59 nsk_jvmti_aod_disableEventsAndFinish(agentName, testEvents, testEventsNumber, 0, jvmti, jni); 60 return; 61 } 62 63 NSK_DISPLAY2("%s: ObjectAlloc event received (object class: %s)\n", agentName, className); 64 65 if (!strcmp(className, REDEFINED_CLASS_NAME)) { 66 int success = 1; 67 68 if (!NSK_VERIFY(nsk_jvmti_aod_redefineClass(options, jvmti, object_class, REDEFINED_CLASS_FILE_NAME))) { 69 NSK_COMPLAIN1("%s: failed to redefine class\n", agentName); 70 success = 0; 71 } 72 73 nsk_jvmti_aod_disableEventsAndFinish(agentName, testEvents, testEventsNumber, success, jvmti, jni); 74 } 75 } 76 77 #ifdef STATIC_BUILD 78 JNIEXPORT jint JNI_OnLoad_attach002aAgent00(JavaVM *jvm, char *options, void *reserved) { 79 return JNI_VERSION_1_8; 80 } 81 #endif 82 83 JNIEXPORT jint JNICALL 84 #ifdef STATIC_BUILD 85 Agent_OnAttach_attach002aAgent00(JavaVM *vm, char *optionsString, void *reserved) 86 #else 87 Agent_OnAttach(JavaVM *vm, char *optionsString, void *reserved) 88 #endif 89 { 90 jvmtiEventCallbacks eventCallbacks; 91 jvmtiCapabilities caps; 92 jvmtiEnv* jvmti = NULL; 93 JNIEnv* jni = NULL; 94 95 if (!NSK_VERIFY((options = (Options*) nsk_aod_createOptions(optionsString)) != NULL)) 96 return JNI_ERR; 97 98 agentName = nsk_aod_getOptionValue(options, NSK_AOD_AGENT_NAME_OPTION); 99 100 if ((jni = (JNIEnv*) nsk_aod_createJNIEnv(vm)) == NULL) 101 return NSK_FALSE; 102 103 if (!NSK_VERIFY((jvmti = nsk_jvmti_createJVMTIEnv(vm, reserved)) != NULL)) 104 return JNI_ERR; 105 106 memset(&caps, 0, sizeof(caps)); 107 caps.can_redefine_classes = 1; 108 caps.can_generate_vm_object_alloc_events = 1; 109 if (!NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&caps)) ) { 110 return JNI_ERR; 111 } 112 113 memset(&eventCallbacks,0, sizeof(eventCallbacks)); 114 eventCallbacks.VMObjectAlloc = vmObjectAllocHandler; 115 if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks))) ) { 116 return JNI_ERR; 117 } 118 119 if (!(nsk_jvmti_aod_enableEvents(jvmti, testEvents, testEventsNumber))) { 120 return JNI_ERR; 121 } 122 123 NSK_DISPLAY1("%s: initialization was done\n", agentName); 124 125 if (!NSK_VERIFY(nsk_aod_agentLoaded(jni, agentName))) 126 return JNI_ERR; 127 128 return JNI_OK; 129 } 130 131 }