/*

 * 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"

extern "C" {

#define METH_NUM 4 /* overall number of methods */

#define STATUS_FAILED 2

#define PASSED 0

/* line number matrix of original methods */

static int orig_ln[METH_NUM][8] = {

    {34, 0, 0, 0, 0, 0, 0, 0}, /* <init> */

    {40,41,43, 0, 0, 0, 0, 0}, /* checkIt */

    {55, 0, 0, 0, 0, 0, 0, 0}, /* finMethod */

    {48,50,51,50,52, 0, 0, 0}  /* statMethod */

};

/* line number matrix of redefined methods */

static int redf_ln[METH_NUM][8] = {

    {38,39,40,41,42,43,44,46}, /* <init> */

    {51,53,55, 0, 0, 0, 0, 0}, /* checkIt */

    {64,66,67,68,69,70,72, 0}, /* finMethod */

    {60, 0, 0, 0, 0, 0, 0, 0}  /* statMethod */

};

typedef struct {   /* line numbers of a method */

    int inst;      /* type of a method: 0- static; 1- instance */

    char *m_name;  /* a method name */

    char *m_sign;  /* JVM signature of a method */

    int lcount;    /* line numbers quantity */

    jmethodID mid; /* JNI's method ID */

} methInfo;

/* list of original methods */

static methInfo origMethInfo[] = {

    {1, (char*) "<init>", (char*) "()V", 1, NULL},

    {1, (char*) "checkIt", (char*) "(Ljava/io/PrintStream;Z)I", 3, NULL},

    {1, (char*) "finMethod", (char*) "(CJIJ)V", 1, NULL},

    {0, (char*) "statMethod", (char*) "(III)D", 5, NULL}

};

/* list of redefined methods */

static methInfo redefMethInfo[] = {

    {1, (char*) "<init>", (char*) "()V", 8, NULL},

    {1, (char*) "checkIt", (char*) "(Ljava/io/PrintStream;Z)I", 3, NULL},

    {1, (char*) "finMethod", (char*) "(CJIJ)V", 7, NULL},

    {0, (char*) "statMethod", (char*) "(III)D", 1, NULL}

};

static jvmtiEnv *jvmti = NULL;

static jvmtiCapabilities caps;

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_redefclass010(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_redefclass010(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_redefclass010(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

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

    jint res;

    jvmtiError err;

        printf("%s: Failed to call GetEnv: error=%d\n", __FILE__, res);

        return JNI_ERR;

    }

    err = jvmti->GetPotentialCapabilities(&caps);

    if (err != JVMTI_ERROR_NONE) {

        printf("(GetPotentialCapabilities) unexpected error: %s (%d)\n",

               TranslateError(err), err);

        return JNI_ERR;

    }

    err = jvmti->AddCapabilities(&caps);

    if (err != JVMTI_ERROR_NONE) {

        printf("(AddCapabilities) unexpected error: %s (%d)\n",

               TranslateError(err), err);

        return JNI_ERR;

    }

    err = jvmti->GetCapabilities(&caps);

    if (err != JVMTI_ERROR_NONE) {

        printf("(GetCapabilities) unexpected error: %s (%d)\n",

               TranslateError(err), err);

        return JNI_ERR;

    }

    if (!caps.can_redefine_classes) {

        printf("Warning: RedefineClasses is not implemented\n");

    }

    if (!caps.can_get_line_numbers) {

        printf("Warning: no access to line number info\n");

    }

    return JNI_OK;

}

int checkAttr(JNIEnv *env, jclass redefCls, methInfo methodsInfo[], jint vrb) {

    jvmtiError err;

    int i, j, chkval = 0;

    int totRes = PASSED;

    jint count = -1;

    jvmtiLineNumberEntry *ln_table;

    if (!caps.can_get_line_numbers) {

        return PASSED;

    }

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

        /* get the JNI method ID for a method with name m_name and

           signature m_sign */

        if (methodsInfo[i].inst) { /* an instance method */

            methodsInfo[i].mid = env->GetMethodID(redefCls,

                    methodsInfo[i].m_name, methodsInfo[i].m_sign);

        } else {                   /* a static method */

            methodsInfo[i].mid = env->GetStaticMethodID(redefCls,

                    methodsInfo[i].m_name, methodsInfo[i].m_sign);

        }

        if (methodsInfo[i].mid == NULL) {

            printf("%s: Failed to get the method ID for the%s%s method \"%s\", signature \"%s\"\n",

                __FILE__, (vrb==2)?" original ":" ", methodsInfo[i].inst?"instance":"static",

                methodsInfo[i].m_name, methodsInfo[i].m_sign);

            return STATUS_FAILED;

        }

        /* get the LineNumberTable attribute */

            printf("%s: Failed to call GetLineNumberTable(): error=%d: %s\n",

                __FILE__, err, TranslateError(err));

            printf("\tfor the%s%s method \"%s\", signature \"%s\"\n\n",

                (vrb==2)?" original ":" ", methodsInfo[i].inst?"instance":"static",

                methodsInfo[i].m_name, methodsInfo[i].m_sign);

            return STATUS_FAILED;

        } else {

            if (count != methodsInfo[i].lcount) {

                printf(

                    "TEST %s %s method \"%s\", signature \"%s\": found %d lines in the LineNumberTable, expected %d\n",

                    (vrb==2)?"BUG: original ":"FAILED:",

                    methodsInfo[i].inst?"instance":"static",

                    methodsInfo[i].m_name, methodsInfo[i].m_sign,

                    count, methodsInfo[i].lcount);

                totRes = STATUS_FAILED;

                continue;

            }

            else if (vrb == 1)

                printf(

                    "\nChecking line numbers in the LineNumberTable of the %s method \"%s\", signature \"%s\" ...\n"

                    "\toverall number of lines: %d as expected\n",

                    methodsInfo[i].inst?"instance":"static",

                    methodsInfo[i].m_name, methodsInfo[i].m_sign, count);

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

                if (vrb == 2)

                    chkval = orig_ln[i][j];

                else

                    chkval = redf_ln[i][j];

                if (ln_table[j].line_number != chkval) {

                    printf(

                        "TEST %s %s method \"%s\", signature \"%s\": "

                        "entry #%d has value %d in the LineNumberTable, expected %d\n",

                        (vrb==2)?"BUG: original":"FAILED:",

                        methodsInfo[i].inst?"instance":"static",

                        methodsInfo[i].m_name, methodsInfo[i].m_sign,

                        j, ln_table[j].line_number, chkval);

                    totRes = STATUS_FAILED;

                    break;

                }

                else if (vrb == 1)

                    printf("\tentry #%d has value %d as expected\n",

                        j, ln_table[j].line_number);

            }

        }

    }

    return totRes;

}

JNIEXPORT jint JNICALL

Java_nsk_jvmti_RedefineClasses_redefclass010_checkOrigAttr(JNIEnv *env,

        jclass cls, jobject redefObj) {

    jclass redefCls = env->GetObjectClass(redefObj);

    return checkAttr(env, redefCls, origMethInfo, 2);

}

JNIEXPORT jint JNICALL

Java_nsk_jvmti_RedefineClasses_redefclass010_makeRedefinition(JNIEnv *env,

        jclass cls, jint vrb, jclass redefCls, jbyteArray classBytes) {

    jvmtiError err;

    jvmtiClassDefinition classDef;

    if (jvmti == NULL) {

        printf("JVMTI client was not properly loaded!\n");

        return STATUS_FAILED;

    }

    if (!caps.can_redefine_classes) {

        return PASSED;

    }

    /* fill the structure jvmtiClassDefinition */

    classDef.klass = redefCls;

    classDef.class_byte_count = env->GetArrayLength(classBytes);

    classDef.class_bytes = (unsigned char *) env->GetByteArrayElements(classBytes, NULL);

    if (vrb)

        printf("\n>>>>>>>> Invoke RedefineClasses():\n\tnew class byte count=%d\n",

            classDef.class_byte_count);

        printf("%s: Failed to call RedefineClasses(): error=%d: %s\n",

            __FILE__, err, TranslateError(err));

        printf("\tFor more info about this error see the JVMTI spec.\n");

        return JNI_ERR;

    }

    if (vrb)

        printf("<<<<<<<< RedefineClasses() is successfully done\n\n");

    return PASSED;

}

JNIEXPORT jint JNICALL

Java_nsk_jvmti_RedefineClasses_redefclass010_getResult(JNIEnv *env,

    jclass cls, jint vrb, jobject redefObj) {

    jclass redefCls = env->GetObjectClass(redefObj);

    return checkAttr(env, redefCls, redefMethInfo, vrb);

}

}