/*

 * 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>

extern "C" {

/*

 * Expected agent work scenario:

 *  - during initialization agent enables events VMObjectAlloc

 *  - agent receives VMObjectAlloc event for instance of InterruptedException,

 *    redefines class InterruptedException and finishes work

 */

#define REDEFINED_CLASS_NAME "Ljava/lang/InterruptedException;"

#define REDEFINED_CLASS_FILE_NAME "java/lang/InterruptedException"

static Options* options = NULL;

static const char* agentName;

static jvmtiEvent testEvents[] = {JVMTI_EVENT_VM_OBJECT_ALLOC};

static const int testEventsNumber = 1;

void JNICALL vmObjectAllocHandler(jvmtiEnv * jvmti,

        JNIEnv * jni,

        jthread thread,

        jobject object,

        jclass object_class,

        jlong size) {

    char className[MAX_STRING_LENGTH];

    if (!nsk_jvmti_aod_getClassName(jvmti, object_class, className)) {

        nsk_jvmti_aod_disableEventsAndFinish(agentName, testEvents, testEventsNumber, 0, jvmti, jni);

        return;

    }

    NSK_DISPLAY2("%s: ObjectAlloc event received (object class: %s)\n", agentName, className);

    if (!strcmp(className, REDEFINED_CLASS_NAME)) {

        int success = 1;

        if (!NSK_VERIFY(nsk_jvmti_aod_redefineClass(options, jvmti, object_class, REDEFINED_CLASS_FILE_NAME))) {

            NSK_COMPLAIN1("%s: failed to redefine class\n", agentName);

            success = 0;

        }

        nsk_jvmti_aod_disableEventsAndFinish(agentName, testEvents, testEventsNumber, success, jvmti, jni);

    }

}

#ifdef STATIC_BUILD

JNIEXPORT jint JNI_OnLoad_attach002aAgent00(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

JNIEXPORT jint JNICALL

#ifdef STATIC_BUILD

Agent_OnAttach_attach002aAgent00(JavaVM *vm, char *optionsString, void *reserved)

#else

Agent_OnAttach(JavaVM *vm, char *optionsString, void *reserved)

#endif

{

    jvmtiEventCallbacks eventCallbacks;

    jvmtiCapabilities caps;

    jvmtiEnv* jvmti = NULL;

    JNIEnv* jni = NULL;

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

    caps.can_redefine_classes = 1;

    caps.can_generate_vm_object_alloc_events = 1;

        return JNI_ERR;

    }

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

    eventCallbacks.VMObjectAlloc = vmObjectAllocHandler;

        return JNI_ERR;

    }

    if (!(nsk_jvmti_aod_enableEvents(jvmti, testEvents, testEventsNumber))) {

        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;

}

}