/*

 * Copyright (c) 2007, 2019, 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>

#include "ExceptionCheckingJniEnv.hpp"

extern "C" {

/*

 * 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(jvmti->SetTag(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

     */

}

void registerNativeMethods(JNIEnv* jni_env) {

    jclass appClass;

    JNINativeMethod nativeMethods[] = {

            { (char*) "setTagFor", (char*) "(Ljava/lang/Object;)Z", (void*) Java_nsk_jvmti_AttachOnDemand_attach021_attach021Target_setTagFor },

            { (char*) "shutdownAgent", (char*) "()V", (void*) Java_nsk_jvmti_AttachOnDemand_attach021_attach021Target_shutdownAgent } };

    jint nativeMethodsNumber = 2;

}

#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;

    options = (Options*) nsk_aod_createOptions(optionsString);

    if (!NSK_VERIFY(options != NULL))

        return JNI_ERR;

    agentName = nsk_aod_getOptionValue(options, NSK_AOD_AGENT_NAME_OPTION);

    jni = (JNIEnv*) nsk_aod_createJNIEnv(vm);

    if (jni == NULL)

        return JNI_ERR;

    jvmti = nsk_jvmti_createJVMTIEnv(vm, reserved);

    if (!NSK_VERIFY(jvmti != NULL))

        return JNI_ERR;

    registerNativeMethods(jni);

    memset(&caps, 0, sizeof(caps));

    caps.can_tag_objects = 1;

    caps.can_generate_object_free_events = 1;

    if (!NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&caps))) {

        return JNI_ERR;

    }

    memset(&eventCallbacks,0, sizeof(eventCallbacks));

    eventCallbacks.ObjectFree = objectFreeHandler;

    if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&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;

}

}