/*

 * Copyright (c) 2004, 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_START 100

static jvmtiEnv *jvmti = NULL;

static jvmtiCapabilities caps;

static jvmtiEventCallbacks callbacks;

static jrawMonitorID access_lock, wait_lock;

static jint result = PASSED;

static jboolean printdump = JNI_FALSE;

static jthread thr_ptr = NULL;

static jint wait_time = 0;

static jint state[] = {

    JVMTI_THREAD_STATE_RUNNABLE,

    JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER,

    JVMTI_THREAD_STATE_IN_OBJECT_WAIT

};

void printStateFlags(jint flags) {

    if (flags & JVMTI_THREAD_STATE_SUSPENDED)

        printf(" JVMTI_THREAD_STATE_SUSPENDED");

    if (flags & JVMTI_THREAD_STATE_INTERRUPTED)

        printf(" JVMTI_THREAD_STATE_INTERRUPTED");

    if (flags & JVMTI_THREAD_STATE_IN_NATIVE)

        printf(" JVMTI_THREAD_STATE_IN_NATIVE");

    printf(" (0x%0x)\n", flags);

}

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

    jvmtiError err;

    err = jvmti_env->SetEventNotificationMode(JVMTI_ENABLE,

        JVMTI_EVENT_THREAD_START, NULL);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

}

void JNICALL

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

    jvmtiThreadInfo thrInfo;

    jvmtiError err;

    err = jvmti_env->RawMonitorEnter(access_lock);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

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

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

    if (thrInfo.name != NULL && strcmp(thrInfo.name, "thr1") == 0) {

        thr_ptr = env->NewGlobalRef(thread);

        if (printdump == JNI_TRUE) {

            printf(">>> ThreadStart: \"%s\", 0x%p\n", thrInfo.name, thr_ptr);

        }

    }

    err = jvmti_env->RawMonitorExit(access_lock);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

}

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_thrstat002(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_thrstat002(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_thrstat002(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;

    }

    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_suspend) {

        printf("Warning: suspend/resume is not implemented\n");

    }

    err = jvmti->CreateRawMonitor("_access_lock", &access_lock);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        return JNI_ERR;

    }

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

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        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 VM_INIT event: %s (%d)\n",

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

    return JNI_OK;

}

JNIEXPORT void JNICALL

Java_nsk_jvmti_GetThreadState_thrstat002_init(JNIEnv *env, jclass cls,

        jint waitTime) {

    wait_time = waitTime * 60000;

}

void wait_for(jint millis) {

    jvmtiError err;

    err = jvmti->RawMonitorEnter(wait_lock);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

    err = jvmti->RawMonitorWait(wait_lock, (jlong)millis);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

    err = jvmti->RawMonitorExit(wait_lock);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

}

JNIEXPORT void JNICALL

Java_nsk_jvmti_GetThreadState_thrstat002_checkStatus(JNIEnv *env, jclass cls,

        jint statInd, jboolean suspended) {

    jint thrState;

    jint suspState = -1;

    jint right_stat = (suspended ? JVMTI_THREAD_STATE_SUSPENDED : 0);

    jvmtiError right_ans = (suspended ? JVMTI_ERROR_THREAD_SUSPENDED : JVMTI_ERROR_NONE);

    const char *suspStr = (suspended ? ", suspended" : "");

    jvmtiError err;

    jint millis;

    jboolean timeout_is_reached;

    unsigned int waited_millis;

    if (jvmti == NULL) {

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

        result = STATUS_FAILED;

        return;

    }

    if (thr_ptr == NULL) {

        printf("Missing thread \"thr1\" start event\n");

        result = STATUS_FAILED;

        return;

    }

    if (!caps.can_suspend) {

        return;

    }

    timeout_is_reached = JNI_TRUE;

    for (millis = WAIT_START, waited_millis=0; millis < wait_time; millis <<= 1) {

        err = jvmti->GetThreadState(thr_ptr, &thrState);

        if (err != JVMTI_ERROR_NONE) {

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

                statInd, TranslateError(err), err);

            result = STATUS_FAILED;

            timeout_is_reached = JNI_FALSE;

            break;

        }

        suspState = thrState & JVMTI_THREAD_STATE_SUSPENDED;

        if (suspended || (thrState & JVMTI_THREAD_STATE_RUNNABLE) == 0 ||

            (state[statInd] == JVMTI_THREAD_STATE_RUNNABLE)) {

            timeout_is_reached = JNI_FALSE;

            break;

        }

        waited_millis += millis;

        wait_for(millis);

    }

    if (printdump == JNI_TRUE) {

        printf(">>> thread \"thr1\" (0x%p) state: %s (%d)\n",

            thr_ptr, TranslateState(thrState), thrState);

        printf(">>>\tflags:");

        printStateFlags(suspState);

    }

    if (timeout_is_reached == JNI_TRUE) {

        printf("Error: timeout (%d secs) has been reached\n", waited_millis/1000);

    }

    if ((thrState & state[statInd]) == 0) {

        printf("Wrong thread \"thr1\" (0x%p%s) state:\n", thr_ptr, suspStr);

        printf("    expected: %s (%d)\n",

            TranslateState(state[statInd]), state[statInd]);

        printf("      actual: %s (%d)\n",

            TranslateState(thrState), thrState);

        result = STATUS_FAILED;

    }

    if (suspState != right_stat) {

        printf("Wrong thread \"thr1\" (0x%p%s) state flags:\n",

               thr_ptr, suspStr);

        printf("    expected:");

        printStateFlags(right_stat);

        printf("    actual:");

        printStateFlags(suspState);

        result = STATUS_FAILED;

    }

    err = jvmti->SuspendThread(thr_ptr);

    if (err != right_ans) {

        printf("Wrong result of SuspendThread() for \"thr1\" (0x%p%s):\n",

               thr_ptr, suspStr);

        printf("    expected: %s (%d), actual: %s (%d)\n",

            TranslateError(right_ans), right_ans, TranslateError(err), err);

        result = STATUS_FAILED;

    }

    if (!suspended) {

        // wait till thread is not suspended

        timeout_is_reached = JNI_TRUE;

        for (millis = WAIT_START, waited_millis=0; millis < wait_time; millis <<= 1) {

            waited_millis += millis;

            wait_for(millis);

            err = jvmti->GetThreadState(thr_ptr, &thrState);

            if (err != JVMTI_ERROR_NONE) {

                printf("(GetThreadState#%d,after) unexpected error: %s (%d)\n",

                    statInd, TranslateError(err), err);

                timeout_is_reached = JNI_FALSE;

                result = STATUS_FAILED;

                break;

            }

            suspState = thrState & JVMTI_THREAD_STATE_SUSPENDED;

            if (suspState) {

                timeout_is_reached = JNI_FALSE;

                break;

            }

        }

        if (timeout_is_reached == JNI_TRUE) {

            printf("Error: timeout (%d secs) has been reached\n", waited_millis/1000);

        }

        if ((thrState & state[statInd]) == 0) {

            printf("Wrong thread \"thr1\" (0x%p) state after SuspendThread:\n",

                thr_ptr);

            printf("    expected: %s (%d)\n",

                TranslateState(state[statInd]), state[statInd]);

            printf("      actual: %s (%d)\n",

                TranslateState(thrState), thrState);

            result = STATUS_FAILED;

        }

        if (suspState != JVMTI_THREAD_STATE_SUSPENDED) {

            printf("Wrong thread \"thr1\" (0x%p) state flags", thr_ptr);

            printf(" after SuspendThread:\n");

            printf("    expected:");

            printStateFlags(JVMTI_THREAD_STATE_SUSPENDED);

            printf("    actual:");

            printStateFlags(suspState);

            result = STATUS_FAILED;

        }

        err = jvmti->ResumeThread(thr_ptr);

        if (err != JVMTI_ERROR_NONE) {

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

                statInd, TranslateError(err), err);

            result = STATUS_FAILED;

        }

    }

}

JNIEXPORT jint JNICALL

Java_nsk_jvmti_GetThreadState_thrstat002_getRes(JNIEnv *env, jclass cls) {

    return result;

}

}