/*
 * 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 <stdio.h>
#include <string.h>
#include <jvmti.h>
#include "agent_common.h"

#include "nsk_tools.h"
#include "JVMTITools.h"
#include "jvmti_tools.h"
#include "jni_tools.h"

#ifdef __cplusplus
extern "C" {
#endif

#define STATUS_FAILED 2
#define PASSED 0

/* tested methods */
#define METH_NUM 2
static const char *METHODS[][2] = {
    {"nativeMethod", "(Z)V"},
    {"anotherNativeMethod", "()V"},
};

/* event counters for the tested methods and expected numbers
   of the events */
static volatile int bindEv[][2] = {
    {0, 1},
    {0, 1}
};

static const char *CLASS_SIG =
    "Lnsk/jvmti/NativeMethodBind/nativemethbind001$TestedClass;";

static volatile jint result = PASSED;
static jvmtiEnv *jvmti = NULL;
static jvmtiEventCallbacks callbacks;
static jrawMonitorID countLock;

static void lock(jvmtiEnv *jvmti_env, JNIEnv *jni_env) {
    if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB2(RawMonitorEnter,
            jvmti_env, countLock)))
        NSK_CPP_STUB2(FatalError, jni_env,
            "failed to enter a raw monitor\n");
}

static void unlock(jvmtiEnv *jvmti_env, JNIEnv *jni_env) {
    if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB2(RawMonitorExit,
            jvmti_env, countLock)))
        NSK_CPP_STUB2(FatalError, jni_env,
            "failed to exit a raw monitor\n");
}

/** callback functions **/
void JNICALL
NativeMethodBind(jvmtiEnv *jvmti_env, JNIEnv* jni_env, jthread thread,
        jmethodID method, void *addr, void **new_addr) {
    jvmtiPhase phase;
    char *methNam, *methSig;
    int i;

    lock(jvmti_env, jni_env);

    NSK_DISPLAY0(">>>> NativeMethodBind event received\n");

    if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB2(GetPhase, jvmti_env, &phase))) {
        result = STATUS_FAILED;
        unlock(jvmti_env, jni_env);
        return;
    }

    if (phase != JVMTI_PHASE_START && phase != JVMTI_PHASE_LIVE) {
        unlock(jvmti_env, jni_env);
        return;
    }

    if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB5(GetMethodName,
            jvmti_env, method, &methNam, &methSig, NULL))) {
        result = STATUS_FAILED;
        NSK_COMPLAIN0("TEST FAILED: unable to get method name during NativeMethodBind callback\n\n");
        unlock(jvmti_env, jni_env);
        return;
    }

    NSK_DISPLAY2("method: \"%s %s\"\n", methNam, methSig);

    for (i=0; i<METH_NUM; i++) {
        if ((strcmp(methNam,METHODS[i][0]) == 0) &&
                (strcmp(methSig,METHODS[i][1]) == 0)) {
            bindEv[i][0]++;

            NSK_DISPLAY1("CHECK PASSED: NativeMethodBind event received for the method:\n\
\t\"%s\" as expected\n",
                methNam);
            break;
        }
    }

    if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB2(Deallocate,
            jvmti_env, (unsigned char*) methNam))) {
        result = STATUS_FAILED;
        NSK_COMPLAIN0("TEST FAILED: unable to deallocate memory pointed to method name\n\n");
    }
    if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB2(Deallocate,
            jvmti_env, (unsigned char*) methSig))) {
        result = STATUS_FAILED;
        NSK_COMPLAIN0("TEST FAILED: unable to deallocate memory pointed to method signature\n\n");
    }

    NSK_DISPLAY0("<<<<\n\n");

    unlock(jvmti_env, jni_env);
}
/************************/

/* dummy method used only to provoke NativeMethodBind event */
static void JNICALL
anotherNativeMethod(JNIEnv *env, jobject obj) {
    NSK_DISPLAY0("inside the anotherNativeMethod()\n");
}

/* dummy method used only to provoke NativeMethodBind event */
JNIEXPORT void JNICALL
Java_nsk_jvmti_NativeMethodBind_nativemethbind001_nativeMethod(
        JNIEnv *env, jobject obj, jboolean registerNative) {
    jclass testedCls = NULL;
    JNINativeMethod meth;

    NSK_DISPLAY0("Inside the nativeMethod()\n");

    if (registerNative == JNI_TRUE) {
        NSK_DISPLAY1("Finding class \"%s\" ...\n", CLASS_SIG);
        if (!NSK_JNI_VERIFY(env, (testedCls =
                NSK_CPP_STUB2(FindClass, env, CLASS_SIG)) != NULL)) {
            result = STATUS_FAILED;
            NSK_COMPLAIN1("TEST FAILURE: unable to find class \"%s\"\n\n",
                CLASS_SIG);
            return;
        }

        meth.name = (char *) METHODS[1][0];
        meth.signature = (char *) METHODS[1][1];
        meth.fnPtr = (void *) &anotherNativeMethod;

        NSK_DISPLAY3("Calling RegisterNatives() with \"%s %s\"\n\
\tfor class \"%s\" ...\n",
            METHODS[1][0], METHODS[1][1], CLASS_SIG);
        if (!NSK_JNI_VERIFY_VOID(env, (NSK_CPP_STUB4(RegisterNatives,
                env, testedCls, &meth, 1)) != 0)) {
            result = STATUS_FAILED;
            NSK_COMPLAIN3("TEST FAILURE: unable to RegisterNatives() \"%s %s\" for class \"%s\"\n\n",
                METHODS[1][0], METHODS[1][1], CLASS_SIG);
        }
    }
}

JNIEXPORT jint JNICALL
Java_nsk_jvmti_NativeMethodBind_nativemethbind001_check(
        JNIEnv *env, jobject obj) {
    int i;

    for (i=0; i<METH_NUM; i++)
        if (bindEv[i][0] == bindEv[i][1]) {
            NSK_DISPLAY2("CHECK PASSED: %d NativeMethodBind event(s) for the method \"%s\" as expected\n",
                bindEv[i][0], METHODS[i][0]);
        }
        else {
            result = STATUS_FAILED;
            NSK_COMPLAIN3("TEST FAILED: wrong number of NativeMethodBind events for the method \"%s\":\n\
got: %d\texpected: %d\n\n",
                METHODS[i][0], bindEv[i][0], bindEv[i][1]);
        }

    return result;
}

#ifdef STATIC_BUILD
JNIEXPORT jint JNICALL Agent_OnLoad_nativemethbind001(JavaVM *jvm, char *options, void *reserved) {
    return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNICALL Agent_OnAttach_nativemethbind001(JavaVM *jvm, char *options, void *reserved) {
    return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNI_OnLoad_nativemethbind001(JavaVM *jvm, char *options, void *reserved) {
    return JNI_VERSION_1_8;
}
#endif
jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
    jvmtiCapabilities caps;

    /* init framework and parse options */
    if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))
        return JNI_ERR;

    /* create JVMTI environment */
    if (!NSK_VERIFY((jvmti =
            nsk_jvmti_createJVMTIEnv(jvm, reserved)) != NULL))
        return JNI_ERR;

    /* create a raw monitor */
    if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB3(CreateRawMonitor,
            jvmti, "_counter_lock", &countLock)))
        return JNI_ERR;

    /* add capability to generate compiled method events */
    memset(&caps, 0, sizeof(jvmtiCapabilities));
    caps.can_generate_native_method_bind_events = 1;
    if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB2(AddCapabilities,
            jvmti, &caps)))
        return JNI_ERR;

    if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB2(GetCapabilities,
            jvmti, &caps)))
        return JNI_ERR;
    if (!caps.can_generate_native_method_bind_events)
        NSK_DISPLAY0("Warning: generation of native method bind events is not implemented\n");

    /* set event callback */
    NSK_DISPLAY0("setting event callbacks ...\n");
    (void) memset(&callbacks, 0, sizeof(callbacks));
    callbacks.NativeMethodBind = &NativeMethodBind;
    if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB3(SetEventCallbacks,
            jvmti, &callbacks, sizeof(callbacks))))
        return JNI_ERR;

    NSK_DISPLAY0("setting event callbacks done\nenabling JVMTI events ...\n");
    if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB4(SetEventNotificationMode,
            jvmti, JVMTI_ENABLE, JVMTI_EVENT_NATIVE_METHOD_BIND, NULL)))
        return JNI_ERR;
    NSK_DISPLAY0("enabling the events done\n\n");

    return JNI_OK;
}

#ifdef __cplusplus
}
#endif