/*

 * 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 <string.h>

#include "jvmti.h"

#include "agent_common.h"

#include "jni_tools.h"

#include "jvmti_tools.h"

#include "JVMTITools.h"

extern "C" {

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

/* scaffold objects */

static JNIEnv* jni = NULL;

static jvmtiEnv *jvmti = NULL;

static jlong timeout = 0;

static jrawMonitorID syncLock = NULL;

/* constant names */

#define JVMTI_EVENT_COUNT   (int)(JVMTI_MAX_EVENT_TYPE_VAL - JVMTI_MIN_EVENT_TYPE_VAL + 1)

#define EXPECTED_CLASS_NAME "nsk.jvmti.scenarios.events.EM06.em06t001a"

#define CLASS_LOADER_COUNT_PARAM "classLoaderCount"

static int classLoaderCount = 0;

static int classloadEventCount = 0;

static int classprepareEventCount = 0;

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

/* callbacks */

void

handler(jvmtiEvent event, jvmtiEnv* jvmti, JNIEnv* jni_env,

                    jthread thread, jclass klass) {

    jmethodID methodID;

    jclass classObject;

    jstring jclassName;

    const char *className;

    if (!NSK_JNI_VERIFY(jni_env, (classObject = jni_env->GetObjectClass(klass)) != NULL)) {

        nsk_jvmti_setFailStatus();

        return;

    }

    if (!NSK_JNI_VERIFY(jni_env, (methodID =

            jni_env->GetMethodID(classObject, "getName", "()Ljava/lang/String;")) != NULL)) {

        nsk_jvmti_setFailStatus();

        return;

    }

    jclassName = (jstring) jni_env->CallObjectMethod(klass, methodID);

    className = jni_env->GetStringUTFChars(jclassName, 0);

        if (!NSK_JVMTI_VERIFY(jvmti->RawMonitorEnter(syncLock)))

            nsk_jvmti_setFailStatus();

        switch (event) {

            case JVMTI_EVENT_CLASS_LOAD:

                classloadEventCount++; break;

            case JVMTI_EVENT_CLASS_PREPARE:

                classprepareEventCount++; break;

            default:

                NSK_COMPLAIN1("Unexpected event %s", TranslateEvent(event));

                nsk_jvmti_setFailStatus();

        }

        if (!NSK_JVMTI_VERIFY(jvmti->RawMonitorExit(syncLock)))

            nsk_jvmti_setFailStatus();

    }

    jni_env->ReleaseStringUTFChars(jclassName, className);

}

JNIEXPORT void JNICALL

cbClassLoad(jvmtiEnv* jvmti, JNIEnv* jni_env, jthread thread, jclass klass) {

    handler(JVMTI_EVENT_CLASS_LOAD, jvmti, jni_env, thread, klass);

}

JNIEXPORT void JNICALL

cbClassPrepare(jvmtiEnv* jvmti, JNIEnv* jni_env, jthread thread, jclass klass) {

    handler(JVMTI_EVENT_CLASS_PREPARE, jvmti, jni_env, thread, klass);

}

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

static int

enableEvent(jvmtiEventMode enable, jvmtiEvent event) {

    if (!NSK_JVMTI_VERIFY(jvmti->SetEventNotificationMode(enable, event, NULL))) {

        nsk_jvmti_setFailStatus();

        return NSK_FALSE;

    }

    return NSK_TRUE;

}

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

/**

 * Testcase: check tested events.

 *   - check if expected events received for each method

 *

 * Returns NSK_TRUE if test may continue; or NSK_FALSE for test break.

 */

int checkEvents() {

    int result = NSK_TRUE;

    if (classloadEventCount == classLoaderCount) {

        NSK_DISPLAY1("Expected number of JVMTI_EVENT_CLASS_LOAD events %d\n",

                            classloadEventCount);

    } else {

        NSK_COMPLAIN2("Unexpected number of JVMTI_EVENT_CLASS_LOAD events %d\n\texpected value %d\n",

                            classloadEventCount,

                            classLoaderCount);

        result = NSK_FALSE;

    }

    if (classprepareEventCount == classLoaderCount) {

        NSK_DISPLAY1("Expected number of JVMTI_EVENT_CLASS_PREPARE events %d\n",

                            classloadEventCount);

    } else {

        NSK_COMPLAIN2("Unexpected number of JVMTI_EVENT_CLASS_PREPARE events %d\n\texpected value %d\n",

                            classprepareEventCount,

                            classLoaderCount);

        result = NSK_FALSE;

    }

    return result;

}

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

static int

setCallBacks() {

    jvmtiEventCallbacks eventCallbacks;

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

    eventCallbacks.ClassLoad    = cbClassLoad;

    eventCallbacks.ClassPrepare = cbClassPrepare;

    if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks))))

        return NSK_FALSE;

    return NSK_TRUE;

}

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

/** Agent algorithm. */

static void JNICALL

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

    if (!NSK_JVMTI_VERIFY(jvmti->CreateRawMonitor("_syncLock", &syncLock))) {

        nsk_jvmti_setFailStatus();

        return;

    }

    jni = agentJNI;

    NSK_DISPLAY0("Wait for debuggee to become ready\n");

    if (!nsk_jvmti_waitForSync(timeout))

        return;

    if (!setCallBacks()) {

        return;

    }

    if (!enableEvent(JVMTI_ENABLE, JVMTI_EVENT_CLASS_LOAD)

            || !enableEvent(JVMTI_ENABLE, JVMTI_EVENT_CLASS_PREPARE)) {

        NSK_COMPLAIN0("Events could not be enabled");

        nsk_jvmti_setFailStatus();

        return;

    }

    NSK_DISPLAY0("Let debuggee to load class\n");

    if (!nsk_jvmti_resumeSync())

        return;

    if (!nsk_jvmti_waitForSync(timeout))

        return;

    if (!checkEvents()) {

        nsk_jvmti_setFailStatus();

    }

    if (!enableEvent(JVMTI_DISABLE, JVMTI_EVENT_CLASS_LOAD)

            || !enableEvent(JVMTI_DISABLE, JVMTI_EVENT_CLASS_PREPARE)) {

        NSK_COMPLAIN0("Events could not be disabled");

        nsk_jvmti_setFailStatus();

    }

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

    if (!nsk_jvmti_resumeSync())

        return;

    if (!NSK_JVMTI_VERIFY(jvmti->DestroyRawMonitor(syncLock)))

        nsk_jvmti_setFailStatus();

}

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

/** Agent library initialization. */

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_em06t001(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_em06t001(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_em06t001(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

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

    if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))

        return JNI_ERR;

    timeout = nsk_jvmti_getWaitTime() * 60 * 1000;

    classLoaderCount = nsk_jvmti_findOptionIntValue(CLASS_LOADER_COUNT_PARAM, 100);

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

        return JNI_ERR;

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

        return JNI_ERR;

    return JNI_OK;

}

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

}