/*

 * 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 jint result = PASSED;

static jboolean printdump = JNI_FALSE;

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_contmon003(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_contmon003(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_contmon003(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 (options != NULL && strcmp(options, "printdump") == 0) {

        printdump = JNI_TRUE;

    }

    res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);

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

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

        return JNI_ERR;

    }

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

               TranslateError(err), err);

        return JNI_ERR;

    }

    if (!caps.can_get_current_contended_monitor) {

        /*

         * GetCurrentContendedMonitor is not currently available, but

         * is it potentially available?

         */

        err = jvmti->GetPotentialCapabilities(&caps);

        if (err != JVMTI_ERROR_NONE) {

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

                   TranslateError(err), err);

            return JNI_ERR;

        }

        if (caps.can_get_current_contended_monitor) {

            /*

             * Yes, GetCurrentContendedMonitor is potentially available.

             * Let's turn it on!

             */

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

            caps.can_get_current_contended_monitor = 1;

            err = jvmti->AddCapabilities(&caps);

            if (err != JVMTI_ERROR_NONE) {

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

                       TranslateError(err), err);

                return JNI_ERR;

            }

        } else {

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

        }

    }

    return JNI_OK;

}

JNIEXPORT jint JNICALL

Java_nsk_jvmti_GetCurrentContendedMonitor_contmon003_check(JNIEnv *env,

        jclass cls, jthread thr) {

    jvmtiError err;

    jobject monitor;

    if (jvmti == NULL) {

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

        return STATUS_FAILED;

    }

    if (printdump == JNI_TRUE) {

        printf(">>> invalid thread check ...\n");

    }

    err = jvmti->GetCurrentContendedMonitor(cls, &monitor);

    if (err == JVMTI_ERROR_MUST_POSSESS_CAPABILITY &&

            !caps.can_get_current_contended_monitor) {

        /* It is OK */

    } else if (err != JVMTI_ERROR_INVALID_THREAD) {

        printf("Error expected: JVMTI_ERROR_INVALID_THREAD,\n");

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

        result = STATUS_FAILED;

    }

    if (printdump == JNI_TRUE) {

        printf(">>> null pointer check ...\n");

    }

    err = jvmti->GetCurrentContendedMonitor(thr, NULL);

    if (err == JVMTI_ERROR_MUST_POSSESS_CAPABILITY &&

            !caps.can_get_current_contended_monitor) {

        /* It is OK */

    } else if (err != JVMTI_ERROR_NULL_POINTER) {

        printf("Error expected: JVMTI_ERROR_NULL_POINTER,\n");

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

        result = STATUS_FAILED;

    }

    return result;

}

}