| /* |
| * 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: |
| * - during initialization agent registers native methods used be target application and enables ObjectFree events |
| * - target application using native method and agent's jvmti environment tags object and provokes collection |
| * of this object |
| * - agent receives ObjectFree event for tagged object |
| * - target application using native method calls nsk_aod_agentFinished and agent finishes work |
| * (agent can't call nsk_aod_agentFinished from ObjectFree handler, nsk_aod_agentFinished calls |
| * JNI functions and it is prohibited in ObjectFree handler) |
| * |
| */ |
| |
| #define TAG_VALUE (jlong)777 |
| #define ATTACH021_TARGET_APP_CLASS_NAME "nsk/jvmti/AttachOnDemand/attach021/attach021Target" |
| |
| static jvmtiEnv* jvmti; |
| |
| static Options* options = NULL; |
| static const char* agentName; |
| |
| // agent should set success status from objectFreeHandler |
| volatile int success = 0; |
| |
| JNIEXPORT jboolean JNICALL |
| Java_nsk_jvmti_AttachOnDemand_attach021_attach021Target_setTagFor(JNIEnv * jni, |
| jclass klass, jobject obj) { |
| if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB3(SetTag, jvmti, obj, TAG_VALUE))) { |
| return JNI_FALSE; |
| } |
| |
| NSK_DISPLAY2("%s: object is tagged (tag: %ld)\n", agentName, TAG_VALUE); |
| |
| return JNI_TRUE; |
| } |
| |
| JNIEXPORT void JNICALL |
| Java_nsk_jvmti_AttachOnDemand_attach021_attach021Target_shutdownAgent(JNIEnv * jni, |
| jclass klass) { |
| nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_OBJECT_FREE, success, jvmti, jni); |
| } |
| |
| void JNICALL objectFreeHandler(jvmtiEnv *jvmti, jlong tag) { |
| NSK_DISPLAY2("%s: object free event for object %ld\n", agentName, tag); |
| |
| if (tag != TAG_VALUE) { |
| success = 0; |
| NSK_COMPLAIN2("%s: unexpected tag value, expected is %ld\n", agentName, TAG_VALUE); |
| } else { |
| success = 1; |
| } |
| |
| /* |
| * Can't use JNI functions from ObjectFree event handler, in this test target application calls |
| * function nsk_aod_agentFinished |
| */ |
| } |
| |
| int registerNativeMethods(JNIEnv* jni) { |
| jclass appClass; |
| JNINativeMethod nativeMethods[] = { |
| {"setTagFor", "(Ljava/lang/Object;)Z", (void*) Java_nsk_jvmti_AttachOnDemand_attach021_attach021Target_setTagFor}, |
| {"shutdownAgent", "()V", (void*) Java_nsk_jvmti_AttachOnDemand_attach021_attach021Target_shutdownAgent}}; |
| jint nativeMethodsNumber = 2; |
| |
| if (!NSK_JNI_VERIFY(jni, (appClass = |
| NSK_CPP_STUB2(FindClass, jni, ATTACH021_TARGET_APP_CLASS_NAME)) != NULL)) { |
| return NSK_FALSE; |
| } |
| |
| if (!NSK_JNI_VERIFY(jni, |
| (NSK_CPP_STUB4(RegisterNatives, jni, appClass, nativeMethods, nativeMethodsNumber) == 0))) { |
| return NSK_FALSE; |
| } |
| |
| return NSK_TRUE; |
| } |
| |
| #ifdef STATIC_BUILD |
| JNIEXPORT jint JNI_OnLoad_attach021Agent00(JavaVM *jvm, char *options, void *reserved) { |
| return JNI_VERSION_1_8; |
| } |
| #endif |
| |
| JNIEXPORT jint JNICALL |
| #ifdef STATIC_BUILD |
| Agent_OnAttach_attach021Agent00(JavaVM *vm, char *optionsString, void *reserved) |
| #else |
| Agent_OnAttach(JavaVM *vm, char *optionsString, void *reserved) |
| #endif |
| { |
| jvmtiEventCallbacks eventCallbacks; |
| jvmtiCapabilities caps; |
| 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 JNI_ERR; |
| |
| if (!NSK_VERIFY((jvmti = nsk_jvmti_createJVMTIEnv(vm, reserved)) != NULL)) |
| return JNI_ERR; |
| |
| if (!NSK_VERIFY(registerNativeMethods(jni))) { |
| return JNI_ERR; |
| } |
| |
| memset(&caps, 0, sizeof(caps)); |
| caps.can_tag_objects = 1; |
| caps.can_generate_object_free_events = 1; |
| if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB2(AddCapabilities, jvmti, &caps)) ) { |
| return JNI_ERR; |
| } |
| |
| memset(&eventCallbacks,0, sizeof(eventCallbacks)); |
| eventCallbacks.ObjectFree = objectFreeHandler; |
| if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB3(SetEventCallbacks, jvmti, &eventCallbacks, sizeof(eventCallbacks))) ) { |
| return JNI_ERR; |
| } |
| |
| if (!(nsk_jvmti_aod_enableEvent(jvmti, JVMTI_EVENT_OBJECT_FREE))) { |
| 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 |