| /* |
| * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <jni.h> |
| #include <jvmti.h> |
| #include <aod.h> |
| #include <jvmti_aod.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /* |
| * Expected agent work scenario: |
| * - receive ClassLoad event for class FirstLoadedClass, from handler for this event |
| * disable ClassLoad events for all threads except thread loading FirstLoadedClass |
| * (after these ClassLoad events should come only from this thread) |
| * - receive ClassLoad event for class LastLoadedClass and finish work |
| */ |
| |
| static Options* options = NULL; |
| static const char* agentName; |
| |
| #define FIRST_LOADED_CLASS "Lnsk/jvmti/AttachOnDemand/attach009/FirstLoadedClass;" |
| #define LAST_LOADED_CLASS "Lnsk/jvmti/AttachOnDemand/attach009/LastLoadedClass;" |
| |
| static int disabledForOthers = 0; |
| |
| static volatile int success = 1; |
| |
| void JNICALL |
| classLoadHandler(jvmtiEnv *jvmti, |
| JNIEnv* jni, |
| jthread thread, |
| jclass klass) { |
| static char mainThreadName[MAX_STRING_LENGTH]; |
| char loadedClassName[MAX_STRING_LENGTH]; |
| char threadName[MAX_STRING_LENGTH]; |
| |
| if (!nsk_jvmti_aod_getThreadName(jvmti, thread, threadName)) { |
| nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_CLASS_LOAD, 0, jvmti, jni); |
| return; |
| } |
| |
| if (!nsk_jvmti_aod_getClassName(jvmti, klass, loadedClassName)) { |
| nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_CLASS_LOAD, 0, jvmti, jni); |
| return; |
| } |
| |
| NSK_DISPLAY2("Class '%s' was loaded by thread '%s'\n", loadedClassName, threadName); |
| |
| /* |
| * When class FIRST_LOADED_CLASS was loaded try to disable events for all threads |
| * except main target application thread |
| */ |
| if (strcmp(loadedClassName, FIRST_LOADED_CLASS) == 0) { |
| strcpy(mainThreadName, threadName); |
| |
| if (!nsk_jvmti_aod_disableEvent(jvmti, JVMTI_EVENT_CLASS_LOAD)) { |
| NSK_COMPLAIN0("Failed to disable events\n"); |
| nsk_aod_agentFinished(jni, agentName, 0); |
| return; |
| } |
| |
| if (!NSK_JVMTI_VERIFY( NSK_CPP_STUB4( |
| SetEventNotificationMode, jvmti, JVMTI_ENABLE, JVMTI_EVENT_CLASS_LOAD, thread) ) ) { |
| NSK_COMPLAIN1("Failed to enable events for thread '%s'\n", mainThreadName); |
| nsk_aod_agentFinished(jni, agentName, 0); |
| return; |
| } |
| |
| NSK_DISPLAY1("ClassLoad events are enabled only for thread '%s'", mainThreadName); |
| |
| disabledForOthers = 1; |
| |
| return; |
| } |
| |
| if (disabledForOthers) { |
| if (strcmp(threadName, mainThreadName) != 0) { |
| success = 0; |
| NSK_COMPLAIN1("ClassLoad event was erroneously generated for thread '%s'\n", threadName); |
| } |
| } |
| |
| /* |
| * Stop agent when LAST_LOADED_CLASS was loaded |
| */ |
| if (strcmp(loadedClassName, LAST_LOADED_CLASS) == 0) { |
| nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_CLASS_LOAD, success, jvmti, jni); |
| } |
| } |
| |
| |
| #ifdef STATIC_BUILD |
| JNIEXPORT jint JNI_OnLoad_attach009Agent00(JavaVM *jvm, char *options, void *reserved) { |
| return JNI_VERSION_1_8; |
| } |
| #endif |
| |
| JNIEXPORT jint JNICALL |
| #ifdef STATIC_BUILD |
| Agent_OnAttach_attach009Agent00(JavaVM *vm, char *optionsString, void *reserved) |
| #else |
| Agent_OnAttach(JavaVM *vm, char *optionsString, void *reserved) |
| #endif |
| { |
| jvmtiEnv* jvmti; |
| jvmtiEventCallbacks eventCallbacks; |
| JNIEnv* jni; |
| |
| if (!NSK_VERIFY((options = (Options*) nsk_aod_createOptions(optionsString)) != NULL)) |
| return JNI_ERR; |
| |
| agentName = nsk_aod_getOptionValue(options, NSK_AOD_AGENT_NAME_OPTION); |
| |
| if ((jni = (JNIEnv*) nsk_aod_createJNIEnv(vm)) == NULL) |
| return NSK_FALSE; |
| |
| if (!NSK_VERIFY((jvmti = nsk_jvmti_createJVMTIEnv(vm, reserved)) != NULL)) |
| return JNI_ERR; |
| |
| memset(&eventCallbacks,0, sizeof(eventCallbacks)); |
| eventCallbacks.ClassLoad = classLoadHandler; |
| if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB3(SetEventCallbacks, jvmti, &eventCallbacks, sizeof(eventCallbacks))) ) { |
| return JNI_ERR; |
| } |
| |
| if (!(nsk_jvmti_aod_enableEvent(jvmti, JVMTI_EVENT_CLASS_LOAD))) { |
| return JNI_ERR; |
| } |
| |
| NSK_DISPLAY1("%s: initialization was done\n", agentName); |
| |
| if (!NSK_VERIFY(nsk_aod_agentLoaded(jni, agentName))) |
| return JNI_ERR; |
| |
| return JNI_OK; |
| } |
| |
| #ifdef __cplusplus |
| } |
| #endif |