/*

 * 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

#define WAIT_TIME 1000

static jvmtiEnv *jvmti = NULL;

static jvmtiEventCallbacks callbacks;

static jint result = PASSED;

static jboolean printdump = JNI_FALSE;

static const char *name = "main";

static int mainStarted = 0;

static int eventsCount = 0;

static int eventsExpected = 1;

void JNICALL VMInit(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thr) {

    jvmtiError err;

    jrawMonitorID wait_lock;

    if (printdump == JNI_TRUE) {

        printf(">>> VM init event #%d\n", eventsCount);

    }

    err = jvmti_env->SetEventNotificationMode(JVMTI_ENABLE,

            JVMTI_EVENT_THREAD_START, NULL);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

    err = jvmti_env->CreateRawMonitor("_wait_lock", &wait_lock);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

    err = jvmti_env->RawMonitorEnter(wait_lock);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

    err = jvmti_env->RawMonitorWait(wait_lock, (jlong)WAIT_TIME);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

    err = jvmti_env->RawMonitorExit(wait_lock);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

    err = jvmti_env->DestroyRawMonitor(wait_lock);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

    eventsCount++;

}

void JNICALL ThreadStart(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread) {

    jvmtiError err;

    jvmtiThreadInfo inf;

    err = jvmti_env->GetThreadInfo(thread, &inf);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        result = STATUS_FAILED;

        return;

    }

    if (printdump == JNI_TRUE) {

        printf(">>> thread start: %s\n", inf.name);

    }

    if (inf.name != NULL && strcmp(name, inf.name) == 0) {

        mainStarted++;

        if (eventsCount == 0) {

            printf("ThreadStart event for the main thread occurs\n");

            printf("before the VMInit event does return.\n");

            result = STATUS_FAILED;

        }

    }

}

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_vminit001(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_vminit001(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_vminit001(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;

    }

    callbacks.VMInit = &VMInit;

    callbacks.ThreadStart = &ThreadStart;

    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_VM_INIT, NULL);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        return JNI_ERR;

    }

    return JNI_OK;

}

JNIEXPORT jint JNICALL

Java_nsk_jvmti_VMInit_vminit001_check(JNIEnv *env, jclass cls) {

    if (jvmti == NULL) {

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

        return STATUS_FAILED;

    }

    if (eventsCount != eventsExpected) {

        printf("Wrong number of VM init events: %d, expected: %d\n",

            eventsCount, eventsExpected);

        result = STATUS_FAILED;

    }

    if (!mainStarted) {

        printf("Missing ThreadStart event for the main thread\n");

        result = STATUS_FAILED;

    }

    return result;

}

}