/*

 * Copyright (c) 2003, 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 <string.h>

#include "jvmti.h"

#include "agent_common.h"

#include "JVMTITools.h"

extern "C" {

#define PASSED 0

#define STATUS_FAILED 2

static jvmtiEnv *jvmti = NULL;

static jvmtiCapabilities caps;

static jvmtiEventCallbacks callbacks;

static jint result = PASSED;

static jboolean printdump = JNI_FALSE;

static jbyteArray classBytes;

void JNICALL

Exception(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread,

        jmethodID method, jlocation location, jobject exception,

        jmethodID c_method, jlocation c_location) {

    jvmtiError err;

    jclass klass;

    jvmtiClassDefinition classDef;

    err = jvmti->SetEventNotificationMode(JVMTI_DISABLE,

            JVMTI_EVENT_EXCEPTION, NULL);

    if (err != JVMTI_ERROR_NONE) {

        printf("Failed to disable JVMTI_EVENT_EXCEPTION: %s (%d)\n",

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

    err = jvmti_env->GetMethodDeclaringClass(method, &klass);

    if (err != JVMTI_ERROR_NONE) {

        printf("(GetMethodDeclaringClass) unexpected error: %s (%d)\n",

               TranslateError(err), err);

        result = STATUS_FAILED;

        return;

    }

    classDef.klass = klass;

    if (printdump == JNI_TRUE) {

        printf(">>> about to call RedefineClasses\n");

    }

    err = jvmti->RedefineClasses(1, &classDef);

    if (err != JVMTI_ERROR_NONE) {

        printf("(RedefineClasses) unexpected error: %s (%d)\n",

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

}

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_redefclass018(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_redefclass018(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_redefclass018(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

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

    jvmtiError err;

    jint res;

    if (options != NULL && strcmp(options, "printdump") == 0) {

        printdump = JNI_TRUE;

    }

    if (res != JNI_OK || jvmti == NULL) {

        printf("Wrong result of a valid call to GetEnv!\n");

        return JNI_ERR;

    }

    err = jvmti->GetPotentialCapabilities(&caps);

    if (err != JVMTI_ERROR_NONE) {

        printf("(GetPotentialCapabilities) unexpected error: %s (%d)\n",

               TranslateError(err), err);

        return JNI_ERR;

    }

    err = jvmti->AddCapabilities(&caps);

    if (err != JVMTI_ERROR_NONE) {

        printf("(AddCapabilities) unexpected error: %s (%d)\n",

               TranslateError(err), err);

        return JNI_ERR;

    }

    err = jvmti->GetCapabilities(&caps);

    if (err != JVMTI_ERROR_NONE) {

        printf("(GetCapabilities) unexpected error: %s (%d)\n",

               TranslateError(err), err);

        return JNI_ERR;

    }

    if (!caps.can_redefine_classes) {

        printf("Warning: RedefineClasses is not implemented\n");

    }

    if (caps.can_generate_exception_events) {

        callbacks.Exception = &Exception;

        err = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks));

        if (err != JVMTI_ERROR_NONE) {

            printf("(SetEventCallbacks) unexpected error: %s (%d)\n",

                   TranslateError(err), err);

            return JNI_ERR;

        }

    } else {

        printf("Warning: Breakpoint event is not implemented\n");

    }

    return JNI_OK;

}

JNIEXPORT void JNICALL

Java_nsk_jvmti_RedefineClasses_redefclass018_getReady(JNIEnv *env, jclass cls,

        jclass clazz, jbyteArray bytes) {

    jvmtiError err;

    jthread thread;

    if (jvmti == NULL) {

        printf("JVMTI client was not properly loaded!\n");

        result = STATUS_FAILED;

        return;

    }

    if (!caps.can_redefine_classes ||

        !caps.can_generate_exception_events) return;

    if ((err = (jvmti->GetCurrentThread(&thread))) != JVMTI_ERROR_NONE) {

        printf("Failed to get current thread: %s (%d)\n", TranslateError(err), err);

        result = STATUS_FAILED;

        return;

    }

    err = jvmti->SetEventNotificationMode(JVMTI_ENABLE,

            JVMTI_EVENT_EXCEPTION, thread);

    if (err != JVMTI_ERROR_NONE) {

        printf("Failed to enable JVMTI_EVENT_EXCEPTION_CATCH: %s (%d)\n",

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

}

JNIEXPORT jint JNICALL

Java_nsk_jvmti_RedefineClasses_redefclass018_check(JNIEnv *env, jclass cls) {

    return result;

}

}