/*

 * Copyright (c) 2007, 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 <stdlib.h>

#include <string.h>

#include <jni.h>

#include <jvmti.h>

#include <aod.h>

#include <jvmti_aod.h>

extern "C" {

/*

 * Expected agent work scenario:

 *  - during initialization agent enables ThreadStart events

 *  - target application starts thread

 *  - agent receives ThreadStart event and tries to find thread provoked this event

 *    in all VM thread groups and finishes work

 */

#define STARTED_TEST_THREAD_NAME "attach041-TestThread"

static Options* options = NULL;

static const char* agentName;

int tryFindThread(jvmtiEnv *jvmti, jthreadGroup group, const char* threadNameToFind) {

    jint threadsCount = 0;

    jthread *threads = NULL;

    jint groupsCount = 0;

    jthreadGroup* groups = NULL;

    jvmtiThreadGroupInfo groupInfo;

    int i;

    char threadGroupName[MAX_STRING_LENGTH];

    if(!NSK_JVMTI_VERIFY(NSK_CPP_STUB3(GetThreadGroupInfo, jvmti, group, &groupInfo))) {

        return 0;

    }

    strcpy(threadGroupName, groupInfo.name);

    nsk_jvmti_aod_deallocate(jvmti, (unsigned char*)groupInfo.name);

    NSK_DISPLAY3("%s: trying to find thread '%s' in group '%s'\n", agentName, threadNameToFind, threadGroupName);

    if(!NSK_JVMTI_VERIFY(NSK_CPP_STUB6(GetThreadGroupChildren, jvmti, group, &threadsCount, &threads, &groupsCount, &groups))) {

        return 0;

    }

    for (i = 0; i < threadsCount; i++) {

        char threadName[MAX_STRING_LENGTH];

        if (!nsk_jvmti_aod_getThreadName(jvmti, threads[i], threadName)) {

            NSK_COMPLAIN1("%s: failed to get thread name\n", agentName);

            nsk_jvmti_aod_deallocate(jvmti, (unsigned char*)threads);

            return 0;

        }

        if (!strcmp(threadName, threadNameToFind)) {

            nsk_jvmti_aod_deallocate(jvmti, (unsigned char*)threads);

            nsk_jvmti_aod_deallocate(jvmti, (unsigned char*)groups);

            NSK_DISPLAY3("%s: thread '%s' was found in group '%s'\n", agentName, threadNameToFind, threadGroupName);

            return 1;

        }

    }

    // threads array isn't needed more

    nsk_jvmti_aod_deallocate(jvmti, (unsigned char*)threads);

    NSK_DISPLAY3("%s: thread '%s' wasn't found in group '%s'\n", agentName, threadNameToFind, threadGroupName);

    if (groupsCount != 0) {

        for (i = 0; i < groupsCount; i++) {

            if (tryFindThread(jvmti, groups[i], threadNameToFind)) {

                nsk_jvmti_aod_deallocate(jvmti, (unsigned char*)groups);

                return 1;

            }

        }

    }

    nsk_jvmti_aod_deallocate(jvmti, (unsigned char*)groups);

    return 0;

}

void JNICALL threadStartHandler(jvmtiEnv *jvmti,

        JNIEnv* jni,

        jthread thread) {

    char startedThreadName[MAX_STRING_LENGTH];

    if (!nsk_jvmti_aod_getThreadName(jvmti, thread, startedThreadName)) {

        nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_THREAD_START, 0, jvmti, jni);

        return;

    }

    NSK_DISPLAY2("%s: ThreadStart event was received for thread '%s'\n", agentName, startedThreadName);

    if (!strcmp(startedThreadName, STARTED_TEST_THREAD_NAME)) {

        int success = 1;

        int threadWasFound = 0;

        jint groupsCount = 0;

        jthreadGroup *topGroups;

        int i;

        if(!NSK_JVMTI_VERIFY(NSK_CPP_STUB3(GetTopThreadGroups, jvmti, &groupsCount, &topGroups))) {

            NSK_COMPLAIN1("%s: failed to get top thread groups\n", agentName);

            nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_THREAD_START, 0, jvmti, jni);

            return;

        }

        for (i = 0; i < groupsCount; i++) {

            if (tryFindThread(jvmti, topGroups[i], startedThreadName)) {

                threadWasFound = 1;

                break;

            }

        }

        nsk_jvmti_aod_deallocate(jvmti, (unsigned char*)topGroups);

        if (!threadWasFound) {

            success = 0;

            NSK_COMPLAIN2("%s: failed to find thread '%s'\n", agentName, startedThreadName);

        }

        nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_THREAD_START, success, jvmti, jni);

    }

}

#ifdef STATIC_BUILD

JNIEXPORT jint JNI_OnLoad_attach041Agent00(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

JNIEXPORT jint JNICALL

#ifdef STATIC_BUILD

Agent_OnAttach_attach041Agent00(JavaVM *vm, char *optionsString, void *reserved)

#else

Agent_OnAttach(JavaVM *vm, char *optionsString, void *reserved)

#endif

{

    jvmtiEventCallbacks eventCallbacks;

    jvmtiEnv* jvmti;

    JNIEnv* jni;

    if (!NSK_VERIFY((options = (Options*) nsk_aod_createOptions(optionsString)) != NULL))

        return JNI_ERR;

    agentName = nsk_aod_getOptionValue(options, NSK_AOD_AGENT_NAME_OPTION);

    if ((jni = (JNIEnv*) nsk_aod_createJNIEnv(vm)) == NULL)

        return JNI_ERR;

    if (!NSK_VERIFY((jvmti = nsk_jvmti_createJVMTIEnv(vm, reserved)) != NULL))

        return JNI_ERR;

    memset(&eventCallbacks,0, sizeof(eventCallbacks));

    eventCallbacks.ThreadStart = threadStartHandler;

    if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB3(SetEventCallbacks, jvmti, &eventCallbacks, sizeof(eventCallbacks))) ) {

        return JNI_ERR;

    }

    if (!(nsk_jvmti_aod_enableEvent(jvmti, JVMTI_EVENT_THREAD_START))) {

        return JNI_ERR;

    }

    NSK_DISPLAY1("%s: initialization was done\n", agentName);

    if (!NSK_VERIFY(nsk_aod_agentLoaded(jni, agentName)))

        return JNI_ERR;

    return JNI_OK;

}

}