/*

 * 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 <stdlib.h>

#include <string.h>

#include "jni_tools.h"

#include "agent_common.h"

#include "jvmti_tools.h"

#define PASSED 0

#define STATUS_FAILED 2

#ifdef __cplusplus

extern "C" {

#endif

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

/* scaffold objects */

static jlong timeout = 0;

/* test objects */

static jclass debugeeClass = NULL;

static jbyteArray classBytes = NULL;

static int ClassFileLoadHookEventFlag = NSK_FALSE;

const char* CLASS_NAME = "nsk/jvmti/scenarios/bcinstr/BI03/bi03t001a";

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

/** callback functions **/

static void JNICALL

ClassFileLoadHook(jvmtiEnv *jvmti_env, JNIEnv *jni_env,

        jclass class_being_redefined, jobject loader,

        const char* name, jobject protection_domain,

        jint class_data_len, const unsigned char* class_data,

        jint *new_class_data_len, unsigned char** new_class_data) {

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

        ClassFileLoadHookEventFlag = NSK_TRUE;

        NSK_DISPLAY0("ClassFileLoadHook event\n");

        if (class_being_redefined == NULL) {

            /* sent by class load */

            if (!NSK_JNI_VERIFY(jni_env, (*new_class_data_len =

                    NSK_CPP_STUB2(GetArrayLength, jni_env, classBytes)) > 0)) {

                nsk_jvmti_setFailStatus();

                return;

            }

            if (!NSK_JNI_VERIFY(jni_env, (*new_class_data = (unsigned char*)

                    NSK_CPP_STUB3(GetByteArrayElements, jni_env, classBytes, NULL))

                        != NULL)) {

                nsk_jvmti_setFailStatus();

                return;

            }

        }

    }

}

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

static int prepare(jvmtiEnv* jvmti, JNIEnv* jni) {

    const char* DEBUGEE_CLASS_NAME =

        "nsk/jvmti/scenarios/bcinstr/BI03/bi03t001";

    jfieldID field = NULL;

    NSK_DISPLAY1("Find class: %s\n", DEBUGEE_CLASS_NAME);

    if (!NSK_JNI_VERIFY(jni, (debugeeClass =

            NSK_CPP_STUB2(FindClass, jni, DEBUGEE_CLASS_NAME)) != NULL))

        return NSK_FALSE;

            NSK_CPP_STUB2(NewGlobalRef, jni, debugeeClass)) != NULL))

        return NSK_FALSE;

    if (!NSK_JNI_VERIFY(jni, (field =

            NSK_CPP_STUB4(GetStaticFieldID, jni, debugeeClass,

                "newClassBytes", "[B")) != NULL))

        return NSK_FALSE;

    if (!NSK_JNI_VERIFY(jni, (classBytes = (jbyteArray)

            NSK_CPP_STUB3(GetStaticObjectField, jni, debugeeClass, field))

                != NULL))

        return NSK_FALSE;

            NSK_CPP_STUB2(NewGlobalRef, jni, classBytes)) != NULL))

        return NSK_FALSE;

    if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB4(SetEventNotificationMode,

            jvmti, JVMTI_ENABLE, JVMTI_EVENT_CLASS_FILE_LOAD_HOOK, NULL)))

        return JNI_ERR;

    return NSK_TRUE;

}

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

/** Agent algorithm. */

static void JNICALL

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

    if (!nsk_jvmti_waitForSync(timeout))

        return;

    if (!prepare(jvmti, jni)) {

        nsk_jvmti_setFailStatus();

        return;

    }

    /* resume debugee and wait for sync */

    if (!nsk_jvmti_resumeSync())

        return;

    if (!nsk_jvmti_waitForSync(timeout))

        return;

    if (!NSK_VERIFY(ClassFileLoadHookEventFlag)) {

        NSK_COMPLAIN0("Missing ClassFileLoadHook event\n");

        nsk_jvmti_setFailStatus();

    }

    if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB4(SetEventNotificationMode,

            jvmti, JVMTI_DISABLE, JVMTI_EVENT_CLASS_FILE_LOAD_HOOK, NULL)))

        nsk_jvmti_setFailStatus();

    NSK_TRACE(NSK_CPP_STUB2(DeleteGlobalRef, jni, debugeeClass));

    NSK_TRACE(NSK_CPP_STUB2(DeleteGlobalRef, jni, classBytes));

    if (!nsk_jvmti_resumeSync())

        return;

}

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

/** Agent library initialization. */

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_bi03t001(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_bi03t001(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_bi03t001(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

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

    jvmtiEnv* jvmti = NULL;

    jvmtiEventCallbacks callbacks;

    jvmtiCapabilities caps;

    NSK_DISPLAY0("Agent_OnLoad\n");

    if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))

        return JNI_ERR;

    timeout = nsk_jvmti_getWaitTime() * 60 * 1000;

    if (!NSK_VERIFY((jvmti =

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

        return JNI_ERR;

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

    caps.can_generate_all_class_hook_events = 1;

    if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB2(AddCapabilities, jvmti, &caps)))

        return JNI_ERR;

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

        return JNI_ERR;

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

    callbacks.ClassFileLoadHook = &ClassFileLoadHook;

    if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB3(SetEventCallbacks,

            jvmti, &callbacks, sizeof(callbacks))))

        return JNI_ERR;

    return JNI_OK;

}

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

#ifdef __cplusplus

}

#endif