/*

 * 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 <string.h>

#include "jvmti.h"

#include "agent_common.h"

#include "jni_tools.h"

#include "jvmti_tools.h"

#ifdef __cplusplus

extern "C" {

#endif

/* ============================================================================= */

/* scaffold objects */

static jlong timeout = 0;

/* constant names */

#define THREAD_NAME     "TestedThread"

/* constants */

#define DEFAULT_THREADS_COUNT   10

static int threadsCount = 0;

/* ============================================================================= */

static int fillThreadsByName(jvmtiEnv* jvmti, JNIEnv* jni,

                                const char name[], int foundCount, jthread foundThreads[]);

/** Agent algorithm. */

static void JNICALL

agentProc(jvmtiEnv* jvmti, JNIEnv* jni, void* arg) {

    NSK_DISPLAY0("Wait for threads to start\n");

    if (!nsk_jvmti_waitForSync(timeout))

        return;

    /* perform testing */

    {

        jthread* threads = NULL;

        jvmtiError* results = NULL;

        int i;

        NSK_DISPLAY1("Allocate threads array: %d threads\n", threadsCount);

        if (!NSK_JVMTI_VERIFY(

                NSK_CPP_STUB3(Allocate, jvmti, (threadsCount * sizeof(jthread)),

                                                (unsigned char**)&threads))) {

            nsk_jvmti_setFailStatus();

            return;

        }

        NSK_DISPLAY1("  ... allocated array: %p\n", (void*)threads);

        NSK_DISPLAY1("Allocate results array: %d threads\n", threadsCount);

        if (!NSK_JVMTI_VERIFY(

                NSK_CPP_STUB3(Allocate, jvmti, (threadsCount * sizeof(jvmtiError)),

                                                (unsigned char**)&results))) {

            nsk_jvmti_setFailStatus();

            return;

        }

        NSK_DISPLAY1("  ... allocated array: %p\n", (void*)threads);

        NSK_DISPLAY1("Find threads: %d threads\n", threadsCount);

        if (!NSK_VERIFY(fillThreadsByName(jvmti, jni, THREAD_NAME, threadsCount, threads)))

            return;

        NSK_DISPLAY0("Suspend threads list\n");

        if (!NSK_JVMTI_VERIFY(

                NSK_CPP_STUB4(SuspendThreadList, jvmti, threadsCount, threads, results))) {

            nsk_jvmti_setFailStatus();

            return;

        }

        NSK_DISPLAY0("Check threads results:\n");

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

            NSK_DISPLAY3("  ... thread #%d: %s (%d)\n",

                                i, TranslateError(results[i]), (int)results[i]);

            if (!NSK_JVMTI_VERIFY(results[i]))

                nsk_jvmti_setFailStatus();

        }

        NSK_DISPLAY0("Resume threads list\n");

        if (!NSK_JVMTI_VERIFY(

                NSK_CPP_STUB4(ResumeThreadList, jvmti, threadsCount, threads, results))) {

            nsk_jvmti_setFailStatus();

            return;

        }

        NSK_DISPLAY0("Check threads results:\n");

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

            NSK_DISPLAY3("  ... thread #%d: %s (%d)\n",

                                i, TranslateError(results[i]), (int)results[i]);

            if (!NSK_JVMTI_VERIFY(results[i]))

                nsk_jvmti_setFailStatus();

        }

        NSK_DISPLAY0("Get state vector for each thread\n");

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

            jint state = 0;

            NSK_DISPLAY2("  thread #%d (%p):\n", i, (void*)threads[i]);

            if (!NSK_JVMTI_VERIFY(

                    NSK_CPP_STUB3(GetThreadState, jvmti, threads[i], &state))) {

                nsk_jvmti_setFailStatus();

            }

            NSK_DISPLAY2("  ... got state vector: %s (%d)\n",

                            TranslateState(state), (int)state);

            if ((state & JVMTI_THREAD_STATE_SUSPENDED) != 0) {

                NSK_COMPLAIN3("ResumeThreadList() does not turn off flag SUSPENDED for thread #%i:\n"

                              "#   state:  %s (%d)\n",

                                i, TranslateState(state), (int)state);

                nsk_jvmti_setFailStatus();

            }

        }

        NSK_DISPLAY0("Let threads to run and finish\n");

        if (!nsk_jvmti_resumeSync())

            return;

        NSK_DISPLAY0("Wait for thread to finish\n");

        if (!nsk_jvmti_waitForSync(timeout))

            return;

        NSK_DISPLAY0("Delete threads references\n");

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

            if (threads[i] != NULL)

                NSK_TRACE(NSK_CPP_STUB2(DeleteGlobalRef, jni, threads[i]));

        }

        NSK_DISPLAY1("Deallocate threads array: %p\n", (void*)threads);

        if (!NSK_JVMTI_VERIFY(

                NSK_CPP_STUB2(Deallocate, jvmti, (unsigned char*)threads))) {

            nsk_jvmti_setFailStatus();

        }

        NSK_DISPLAY1("Deallocate results array: %p\n", (void*)results);

        if (!NSK_JVMTI_VERIFY(

                NSK_CPP_STUB2(Deallocate, jvmti, (unsigned char*)results))) {

            nsk_jvmti_setFailStatus();

        }

    }

    NSK_DISPLAY0("Let debugee to finish\n");

    if (!nsk_jvmti_resumeSync())

        return;

}

/* ============================================================================= */

/** Find threads whose name starts with specified name prefix. */

static int fillThreadsByName(jvmtiEnv* jvmti, JNIEnv* jni,

                            const char name[], int foundCount, jthread foundThreads[]) {

    jint count = 0;

    jthread* threads = NULL;

    size_t len = strlen(name);

    int found = 0;

    int i;

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

        foundThreads[i] = NULL;

    }

    if (!NSK_JVMTI_VERIFY(

            NSK_CPP_STUB3(GetAllThreads, jvmti, &count, &threads))) {

        nsk_jvmti_setFailStatus();

        return NSK_FALSE;

    }

    found = 0;

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

        jvmtiThreadInfo info;

        if (!NSK_JVMTI_VERIFY(

                NSK_CPP_STUB3(GetThreadInfo, jvmti, threads[i], &info))) {

            nsk_jvmti_setFailStatus();

            break;

        }

        if (info.name != NULL && strncmp(name, info.name, len) == 0) {

            NSK_DISPLAY3("  ... found thread #%d: %p (%s)\n",

                                    found, threads[i], info.name);

            if (found < foundCount)

                foundThreads[found] = threads[i];

            found++;

        }

    }

    if (!NSK_JVMTI_VERIFY(

                NSK_CPP_STUB2(Deallocate, jvmti, (unsigned char*)threads))) {

        nsk_jvmti_setFailStatus();

        return NSK_FALSE;

    }

    if (found != foundCount) {

        NSK_COMPLAIN3("Unexpected number of tested threads found:\n"

                      "#   name:     %s\n"

                      "#   found:    %d\n"

                      "#   expected: %d\n",

                      name, found, foundCount);

        nsk_jvmti_setFailStatus();

        return NSK_FALSE;

    }

    NSK_DISPLAY1("Make global references for threads: %d threads\n", foundCount);

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

        if (!NSK_JNI_VERIFY(jni, (foundThreads[i] = (jthread)

                    NSK_CPP_STUB2(NewGlobalRef, jni, foundThreads[i])) != NULL)) {

            nsk_jvmti_setFailStatus();

            return NSK_FALSE;

        }

        NSK_DISPLAY2("  ... thread #%d: %p\n", i, foundThreads[i]);

    }

    return NSK_TRUE;

}

/* ============================================================================= */

/** Agent library initialization. */

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_resumethrdlst001(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_resumethrdlst001(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_resumethrdlst001(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

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

    jvmtiEnv* jvmti = NULL;

    /* init framework and parse options */

    if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))

        return JNI_ERR;

    timeout = nsk_jvmti_getWaitTime() * 60 * 1000;

    /* get options */

    threadsCount = nsk_jvmti_findOptionIntValue("threads", DEFAULT_THREADS_COUNT);

    if (!NSK_VERIFY(threadsCount > 0))

        return JNI_ERR;

    /* create JVMTI environment */

    if (!NSK_VERIFY((jvmti =

            nsk_jvmti_createJVMTIEnv(jvm, reserved)) != NULL))

        return JNI_ERR;

    /* add specific capabilities for suspending thread */

    {

        jvmtiCapabilities suspendCaps;

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

        suspendCaps.can_suspend = 1;

        if (!NSK_JVMTI_VERIFY(

                NSK_CPP_STUB2(AddCapabilities, jvmti, &suspendCaps)))

            return JNI_ERR;

    }

    /* register agent proc and arg */

    if (!NSK_VERIFY(nsk_jvmti_setAgentProc(agentProc, NULL)))

        return JNI_ERR;

    return JNI_OK;

}

/* ============================================================================= */

#ifdef __cplusplus

}

#endif