127 lines
3.8 KiB
C++
127 lines
3.8 KiB
C++
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <jni.h>
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#include <jvmti.h>
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#include <aod.h>
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#include <jvmti_aod.h>
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extern "C" {
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#define LOADED_CLASS_NAME "Lnsk/jvmti/AttachOnDemand/attach014/ClassToLoad;"
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/*
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* Expected agent work scenario:
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* - during initialization agent enables ClassLoad events
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* - target application loads class 'ClassToLoad'
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* - agent receives ClassLoad event for this class, calls DisposeEnvironment and finishes work
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*/
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static Options* options = NULL;
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static const char* agentName;
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void JNICALL
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classLoadHandler(jvmtiEnv *jvmti,
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JNIEnv* jni,
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jthread thread,
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jclass klass) {
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char className[MAX_STRING_LENGTH];
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if (!nsk_jvmti_aod_getClassName(jvmti, klass, className)) {
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nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_CLASS_LOAD, 0, jvmti, jni);
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return;
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}
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NSK_DISPLAY2("%s: ClassLoad event was received for class '%s'\n", agentName, className);
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if (!strcmp(className, LOADED_CLASS_NAME)) {
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int success = 1;
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if (!nsk_jvmti_aod_disableEvent(jvmti, JVMTI_EVENT_CLASS_LOAD))
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success = 0;
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if (!NSK_JVMTI_VERIFY(jvmti->DisposeEnvironment())) {
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success = 0;
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NSK_COMPLAIN1("%s: failed to dispose environment\n", agentName);
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} else {
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NSK_DISPLAY1("%s: jvmti env was disposed\n", agentName);
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}
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nsk_aod_agentFinished(jni, agentName, success);
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}
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}
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#ifdef STATIC_BUILD
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JNIEXPORT jint JNI_OnLoad_attach014Agent00(JavaVM *jvm, char *options, void *reserved) {
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return JNI_VERSION_1_8;
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}
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#endif
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JNIEXPORT jint JNICALL
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#ifdef STATIC_BUILD
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Agent_OnAttach_attach014Agent00(JavaVM *vm, char *optionsString, void *reserved)
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#else
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Agent_OnAttach(JavaVM *vm, char *optionsString, void *reserved)
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#endif
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{
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jvmtiEventCallbacks eventCallbacks;
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jvmtiEnv* jvmti = NULL;
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JNIEnv* jni = NULL;
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options = (Options*) nsk_aod_createOptions(optionsString);
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if (!NSK_VERIFY(options != NULL))
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return JNI_ERR;
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agentName = nsk_aod_getOptionValue(options, NSK_AOD_AGENT_NAME_OPTION);
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jni = (JNIEnv*) nsk_aod_createJNIEnv(vm);
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if (jni == NULL)
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return NSK_FALSE;
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jvmti = nsk_jvmti_createJVMTIEnv(vm, reserved);
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if (!NSK_VERIFY(jvmti != NULL))
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return JNI_ERR;
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memset(&eventCallbacks,0, sizeof(eventCallbacks));
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eventCallbacks.ClassLoad = classLoadHandler;
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if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks)))) {
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return JNI_ERR;
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}
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if (!(nsk_jvmti_aod_enableEvent(jvmti, JVMTI_EVENT_CLASS_LOAD))) {
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return JNI_ERR;
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}
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NSK_DISPLAY1("%s: initialization was done\n", agentName);
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if (!NSK_VERIFY(nsk_aod_agentLoaded(jni, agentName)))
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return JNI_ERR;
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return JNI_OK;
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}
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}
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