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 ClassPrepare event 36 * - agent waits events for 2 classes loaded by target application and 37 * finishes work 38 */ 39 40 #define CLASS_NAME1 "Lnsk/jvmti/AttachOnDemand/attach015/ClassToLoad1;" 41 #define CLASS_NAME2 "Lnsk/jvmti/AttachOnDemand/attach015/ClassToLoad2;" 42 43 static Options* options = NULL; 44 static const char* agentName; 45 46 static int receivedEventsCount = 0; 47 48 void JNICALL classPrepareHandler(jvmtiEnv *jvmti, 49 JNIEnv* jni, 50 jthread thread, 51 jclass klass) { 52 char className[MAX_STRING_LENGTH]; 53 54 if (!nsk_jvmti_aod_getClassName(jvmti, klass, className)) { 55 nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_CLASS_PREPARE, 0, jvmti, jni); 56 return; 57 } 58 59 NSK_DISPLAY2("%s: class prepare event for class '%s'\n", agentName, className); 60 61 if (!strcmp(className, CLASS_NAME1) || !strcmp(className, CLASS_NAME2)) { 62 receivedEventsCount++; 63 64 if (receivedEventsCount == 2) { 65 nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_CLASS_PREPARE, 1, jvmti, jni); 66 } 67 } 68 } 69 70 #ifdef STATIC_BUILD 71 JNIEXPORT jint JNI_OnLoad_attach015Agent00(JavaVM *jvm, char *options, void *reserved) { 72 return JNI_VERSION_1_8; 73 } 74 #endif 75 76 JNIEXPORT jint JNICALL 77 #ifdef STATIC_BUILD 78 Agent_OnAttach_attach015Agent00(JavaVM *vm, char *optionsString, void *reserved) 79 #else 80 Agent_OnAttach(JavaVM *vm, char *optionsString, void *reserved) 81 #endif 82 { 83 jvmtiEventCallbacks eventCallbacks; 84 jvmtiEnv* jvmti = NULL; 85 JNIEnv* jni = NULL; 86 87 if (!NSK_VERIFY((options = (Options*) nsk_aod_createOptions(optionsString)) != NULL)) 88 return JNI_ERR; 89 90 agentName = nsk_aod_getOptionValue(options, NSK_AOD_AGENT_NAME_OPTION); 91 92 if ((jni = (JNIEnv*) nsk_aod_createJNIEnv(vm)) == NULL) 93 return NSK_FALSE; 94 95 if (!NSK_VERIFY((jvmti = nsk_jvmti_createJVMTIEnv(vm, reserved)) != NULL)) 96 return JNI_ERR; 97 98 memset(&eventCallbacks,0, sizeof(eventCallbacks)); 99 eventCallbacks.ClassPrepare = classPrepareHandler; 100 if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks))) ) { 101 return JNI_ERR; 102 } 103 104 if (!(nsk_jvmti_aod_enableEvent(jvmti, JVMTI_EVENT_CLASS_PREPARE))) { 105 return JNI_ERR; 106 } 107 108 NSK_DISPLAY1("%s: initialization was done\n", agentName); 109 110 if (!NSK_VERIFY(nsk_aod_agentLoaded(jni, agentName))) 111 return JNI_ERR; 112 113 return JNI_OK; 114 } 115 }