/*

 * 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;

static jvmtiEventCallbacks callbacks;

static jvmtiCapabilities caps;

static jint result = PASSED;

void JNICALL FieldAccess(jvmtiEnv *jvmti_env, JNIEnv *env,

        jthread thr, jmethodID method,

        jlocation location, jclass field_klass, jobject obj, jfieldID field) {

}

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_setfldw002(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_setfldw002(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_setfldw002(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

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

    jint res;

    jvmtiError err;

    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_generate_field_access_events) {

        callbacks.FieldAccess = &FieldAccess;

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

        if (err != JVMTI_ERROR_NONE) {

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

                   TranslateError(err), err);

            return JNI_ERR;

        }

        err = jvmti->SetEventNotificationMode(JVMTI_ENABLE,

                JVMTI_EVENT_FIELD_ACCESS, NULL);

        if (err != JVMTI_ERROR_NONE) {

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

                   TranslateError(err), err);

            return JNI_ERR;

        }

    } else {

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

    }

    return JNI_OK;

}

JNIEXPORT jint JNICALL

Java_nsk_jvmti_SetFieldAccessWatch_setfldw002_check(JNIEnv *env, jclass cls) {

    jvmtiError err;

    jfieldID fid;

    if (!caps.can_generate_field_access_events) {

        err = jvmti->SetFieldAccessWatch(cls, fid);

        if (err != JVMTI_ERROR_MUST_POSSESS_CAPABILITY) {

            result = STATUS_FAILED;

            printf("Failed to return JVMTI_ERROR_MUST_POSSESS_CAPABILITY:");

            printf(" %s (%d)\n", TranslateError(err), err);

        }

    } else {

        err = jvmti->SetFieldAccessWatch(NULL, fid);

        if (err != JVMTI_ERROR_INVALID_CLASS) {

            result = STATUS_FAILED;

            printf("Failed to return JVMTI_ERROR_INVALID_CLASS: %s (%d)\n",

                   TranslateError(err), err);

        }

        err = jvmti->SetFieldAccessWatch(cls, NULL);

        if (err != JVMTI_ERROR_INVALID_FIELDID) {

            result = STATUS_FAILED;

            printf("Failed to return JVMTI_ERROR_INVALID_FIELDID: %s (%d)\n",

                   TranslateError(err), err);

        }

        err = jvmti->SetFieldAccessWatch(cls, fid);

        if (err != JVMTI_ERROR_NONE) {

            result = STATUS_FAILED;

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

                   TranslateError(err), err);

        } else {

            err = jvmti->SetFieldAccessWatch(cls, fid);

            if (err != JVMTI_ERROR_DUPLICATE) {

                result = STATUS_FAILED;

                printf("Failed to return JVMTI_ERROR_DUPLICATE: %s (%d)\n",

                       TranslateError(err), err);

            }

        }

    }

    return result;

}

}