/*

 * 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 <jni.h>

#include <jvmti.h>

#include "agent_common.h"

#include <string.h>

#include "jvmti_tools.h"

#ifdef __cplusplus

extern "C" {

#endif

#define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS301/hs301t003/MyClass"

#define CLASS_NAME "Lnsk/jvmti/scenarios/hotswap/HS301/hs301t003/MyClass;"

void JNICALL callbackClassPrepare(jvmtiEnv *jvmti_env,

                               JNIEnv* jni_env,

                               jthread thread,

                               jclass klass) {

  char * className;

  char * generic;

  if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB4(GetClassSignature,

                  jvmti_env, klass, &className, &generic) ) ) {

    nsk_printf(" Agent:: Error while getting ClassFileName Signature ");

  } else {

      if (strcmp(className, CLASS_NAME ) == 0) {

          int redefineNumber =0;

          char fileName[512];

          nsk_jvmti_getFileName(redefineNumber, FILE_NAME,

                  fileName, sizeof(fileName)/sizeof(char));

          nsk_jvmti_disableNotification(jvmti_env,

                  JVMTI_EVENT_CLASS_LOAD, NULL );

          if (nsk_jvmti_redefineClass(jvmti_env, klass, fileName) == NSK_TRUE) {

              nsk_printf("\n Redefine successful.\n");

          } else {

              nsk_printf("\n Redefine failed.\n");

          }

      }

  }

}

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_hs301t003(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_hs301t003(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_hs301t003(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

jint  Agent_Initialize(JavaVM *vm, char *options, void *reserved) {

    jvmtiEnv * jvmti;

    nsk_printf("Agent:: Agent_OnLoad.\n");

    if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB3(GetEnv, vm,

                    (void **)&jvmti, JVMTI_VERSION_1_1) ) ) {

        nsk_printf("Agent:: Could not load JVMTI interface.\n");

        return JNI_ERR;

    } else {

        jvmtiCapabilities caps;

        jvmtiEventCallbacks eventCallbacks;

        if (nsk_jvmti_parseOptions(options) == NSK_FALSE ) {

            nsk_printf("# error agent Failed to parse options.\n");

            return JNI_ERR;

        }

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

        caps.can_redefine_classes = 1;

        caps.can_generate_all_class_hook_events=1;

        if (! NSK_JVMTI_VERIFY ( NSK_CPP_STUB2(AddCapabilities, jvmti, &caps) ))  {

            nsk_printf(" Agent:: Error occured while adding capabilities.\n");

            return JNI_ERR;

        }

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

        eventCallbacks.ClassPrepare = &callbackClassPrepare;

        if (!NSK_JVMTI_VERIFY(

                NSK_CPP_STUB3(SetEventCallbacks, jvmti,

                                    &eventCallbacks, sizeof(eventCallbacks)))) {

            nsk_printf(" Agent:: Error occured while setting event call back.\n");

            return JNI_ERR;

        }

        if ( nsk_jvmti_enableNotification(jvmti, JVMTI_EVENT_CLASS_PREPARE, NULL) == NSK_TRUE ) {

            nsk_printf(" Agent:: Enabled notification.\n");

        } else {

            nsk_printf(" Agent:: Failed to enable notification.\n");

        }

    }

    return JNI_OK;

}

#ifdef __cplusplus

}

#endif