/*
 * 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 "JVMTITools.h"

#ifdef __cplusplus
extern "C" {
#endif

#ifndef JNI_ENV_ARG

#ifdef __cplusplus
#define JNI_ENV_ARG(x, y) y
#define JNI_ENV_PTR(x) x
#else
#define JNI_ENV_ARG(x,y) x, y
#define JNI_ENV_PTR(x) (*x)
#endif

#endif

#define PASSED 0
#define STATUS_FAILED 2

static jvmtiEnv *jvmti = NULL;
static jvmtiEventCallbacks callbacks;
static jint result = PASSED;
static jboolean printdump = JNI_FALSE;
static int count = 0;

void checkMeth(jvmtiEnv *jvmti_env, JNIEnv *env, jclass cl,
        char *name, char *sig, int stat) {
    jvmtiError err;
    jmethodID mid;
    char *ret_name, *ret_sig, *generic;

    if (stat) {
        mid = JNI_ENV_PTR(env)->GetStaticMethodID(JNI_ENV_ARG(env, cl),
            name, sig);
    } else {
        mid = JNI_ENV_PTR(env)->GetMethodID(JNI_ENV_ARG(env, cl), name, sig);
    }
    if (mid == NULL) {
        printf("Cannot find MethodID for \"%s%s\"\n", name, sig);
        result = STATUS_FAILED;
        return;
    }

    err = (*jvmti_env)->GetMethodName(jvmti_env, mid,
        &ret_name, &ret_sig, &generic);
    if (err != JVMTI_ERROR_NONE) {
        printf("\"%s%s\"\n", name, sig);
        printf("(GetMethodName) unexpected error: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
        return;
    }

    if (printdump == JNI_TRUE) {
        printf(">>> %s%s, got: %s%s\n" , name, sig , ret_name, ret_sig);
    }

    if (strcmp(ret_name, name) != 0) {
        printf("Name = %s, sig = %s: wrong name: %s\n", name, sig, ret_name);
        result = STATUS_FAILED;
    }
    if (strcmp(ret_sig, sig) != 0) {
        printf("Name = %s, sig = %s: wrong sig: %s\n", name, sig, ret_sig);
        result = STATUS_FAILED;
    }

    (*jvmti_env)->Deallocate(jvmti_env, (unsigned char*) ret_name);
    (*jvmti_env)->Deallocate(jvmti_env, (unsigned char*) ret_sig);
}

void JNICALL
ClassLoad(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thr, jclass cls) {
    jvmtiError err;
    char *sig, *generic;

    err = (*jvmti_env)->GetClassSignature(jvmti_env, cls, &sig, &generic);
    if (err != JVMTI_ERROR_NONE) {
        printf("(GetClassSignature) unexpected error: %s (%d)\n",
               TranslateError(err), err);
        return;
    }
    if (strcmp(sig, "Lmethname001;") == 0) {
        checkMeth(jvmti_env, (JNIEnv *)env, cls,
            "meth_stat", "(ILjava/lang/String;)[F", 1);
    }
}

#ifdef STATIC_BUILD
JNIEXPORT jint JNICALL Agent_OnLoad_methname001(JavaVM *jvm, char *options, void *reserved) {
    return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNICALL Agent_OnAttach_methname001(JavaVM *jvm, char *options, void *reserved) {
    return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNI_OnLoad_methname001(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 = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (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;
    }

    callbacks.ClassLoad = &ClassLoad;
    err = (*jvmti)->SetEventCallbacks(jvmti, &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, JVMTI_ENABLE,
        JVMTI_EVENT_CLASS_LOAD, NULL);
    if (err != JVMTI_ERROR_NONE) {
        printf("Failed to enable event JVMTI_EVENT_CLASS_LOAD: %s (%d)\n",
               TranslateError(err), err);
        return JNI_ERR;
    }

    return JNI_OK;
}

JNIEXPORT jint JNICALL
Java_nsk_jvmti_GetMethodName_methname001_check(JNIEnv *env, jclass cls) {
    jclass clsId;

    checkMeth(jvmti, env, cls, "<init>", "()V", 0);
    checkMeth(jvmti, env, cls, "meth_1", "(C)C", 0);
    checkMeth(jvmti, env, cls, "meth_1", "(CC)C", 0);
    clsId = JNI_ENV_PTR(env)->FindClass(JNI_ENV_ARG(env,
        "nsk/jvmti/GetMethodName/methname001a"));
    checkMeth(jvmti, env, clsId, "meth_new",
        "()Lnsk/jvmti/GetMethodName/methname001;", 0);
    clsId = JNI_ENV_PTR(env)->FindClass(JNI_ENV_ARG(env,
        "nsk/jvmti/GetMethodName/methname001$Inn"));
    checkMeth(jvmti, env, clsId, "meth_inn", "(Ljava/lang/String;)V", 0);

    return result;
}

#ifdef __cplusplus
}
#endif