/*

 * 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 "jni_tools.h"

#include "agent_common.h"

#include "JVMTITools.h"

extern "C" {

#define STATUS_FAILED 2

#define PASSED 0

#define NO_RESULTS 3

static jvmtiEnv *jvmti = NULL;

static jvmtiCapabilities caps;

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_redefclass003(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_redefclass003(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_redefclass003(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

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

    jint res;

    jvmtiError err;

        printf("%s: Failed to call GetEnv: error=%d\n", __FILE__, res);

        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");

    }

    return JNI_OK;

}

JNIEXPORT jint JNICALL

Java_nsk_jvmti_RedefineClasses_redefclass003_makeRedefinition(JNIEnv *env, jclass cls, jint vrb,

        jclass redefCls, jbyteArray classBytes) {

    jvmtiError err;

    jvmtiClassDefinition classDef;

    int no_results = 0;

    if (jvmti == NULL) {

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

        return STATUS_FAILED;

    }

    if (!caps.can_redefine_classes) {

        return PASSED;

    }

/* filling the structure jvmtiClassDefinition */

    classDef.klass = redefCls;

    classDef.class_byte_count = env->GetArrayLength(classBytes);

    classDef.class_bytes = (unsigned char *) env->GetByteArrayElements(classBytes, NULL);

    if (vrb == 1)

        printf(">>>>>>>> Invoke RedefineClasses():\n\tnew class byte count=%d\n",

            classDef.class_byte_count);

        if (err == JVMTI_ERROR_UNSUPPORTED_REDEFINITION_SCHEMA_CHANGED) {

            printf("Warning: unrestrictedly redefinition of classes is not implemented,\n"

                   "\tso the test has no results.\n");

            no_results = 1;

        }

        else {

            printf("%s: Failed to call RedefineClasses():\n\tthe function returned error %d: %s\n",

                __FILE__, err, TranslateError(err));

            printf("\tFor more info about this error see the JVMTI spec.\n");

        }

        if (no_results == 1) return NO_RESULTS;

        else return JNI_ERR;

    }

    if (vrb == 1)

        printf("<<<<<<<< RedefineClasses() is successfully done\n");

    return PASSED;

}

JNIEXPORT jint JNICALL

Java_nsk_jvmti_RedefineClasses_redefclass003_checkNewFields(JNIEnv *env,

        jclass obj, jint vrb, jclass redefCls) {

    jfieldID fid;

    jint intFld;

    jlong longFld;

        printf("%s: Failed to get the field ID for the static field \"intComplNewFld\"\n",

            __FILE__);

        return STATUS_FAILED;

    }

    intFld = env->GetStaticIntField(redefCls, fid);

        printf("%s: Failed to get the field ID for the static field \"longComplNewFld\"\n",

            __FILE__);

        return STATUS_FAILED;

    }

    longFld = env->GetStaticLongField(redefCls, fid);

    if (intFld != 33 || longFld != 44) {

        printf("Completely new static variable has not assigned its default value:\n");

        printf("\tintComplNewFld = %d, expected 33\n", intFld);

        printf("\tlongComplNewFld = %" LL "d, expected 44\n", longFld);

        return STATUS_FAILED;

    } else {

        if (vrb == 1) {

            printf(

                "Completely new static variables:\n"

                "\tintComplNewFld = %d\n"

                "\tlongComplNewFld = %" LL "d\n",

                intFld, longFld);

        }

        return PASSED;

    }

}

}