/*

 * Copyright (c) 2007, 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 <jvmti.h>

#include "agent_common.h"

#include <jni.h>

#include <string.h>

#include "jvmti_tools.h"

#include "JVMTITools.h"

/*

 *1. Enable event ClassPrepare.

 *2. Upon occurrence of ClassPrepare, set a breakpoint in class static

 * initializer.

 *3. Upon reaching the breakpoint, redefine the class and pop

 *a currently executed frame of the static initializer.

*/

extern "C" {

#define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS204/hs204t002/MyThread"

#define SEARCH_NAME "nsk/jvmti/scenarios/hotswap/HS204/hs204t002/MyThread"

#define CLASS_NAME "Lnsk/jvmti/scenarios/hotswap/HS204/hs204t002/MyThread;"

#define METHOD_NAME "<init>"

#define METHOD_SIGNATURE "()V"

static jint redefineNumber;

static jvmtiEnv * jvmti;

JNIEXPORT void JNICALL

callbackClassPrepare(jvmtiEnv *jvmti,

                                  JNIEnv* jni,

                                  jthread thread,

                                  jclass klass) {

    char * className;

    char * generic;

    redefineNumber=0;

    jvmti->GetClassSignature(klass, &className, &generic);

    /* printf("Agent::Class Name %s \n",className); */

    if ((strcmp(className, CLASS_NAME) == 0)) {

        jclass cls;

        cls = jni->FindClass(SEARCH_NAME);

        if (cls == NULL) {

            printf("Agent::CLS is null");

        } else {

            jmethodID method;

            method = jni->GetMethodID(cls, METHOD_NAME,METHOD_SIGNATURE);

            if (method == NULL) {

                printf("Agent::Method is null ");

            } else {

                jlocation start;

                jlocation end;

                jvmtiError err ;

                err=jvmti->GetMethodLocation(method, &start, &end);

                if (err != JVMTI_ERROR_NONE) {

                    printf("Agent::Errors in finding start and end for the method \n");

                } else {

                    printf("Agent Start = %" LL "d and end = %" LL "d \n", start , end);

                    printf("Agent::setting break points..");

                    err= jvmti->SetBreakpoint(method, start+1);

                    if (err == JVMTI_ERROR_DUPLICATE) {

                        printf("Agent::JVMTI_ERROR_DUPLICATE");

                    } else if (err == JVMTI_ERROR_INVALID_METHODID) {

                        printf("Agent::JVMTI_ERROR_INVALID_METHODID ");

                    } else if (err == JVMTI_ERROR_INVALID_LOCATION) {

                        printf("Agent::JVMTI_ERROR_INVALID_LOCATION ");

                    } else if (err == JVMTI_ERROR_NONE) {

                        printf("Agent::NO ERRORS ");

                    } else {

                        printf("Agent::VERY VERY INVALID STATE ");

                    }

                }

            }

        }

    }

    return;

}

void JNICALL callbackBreakpoint(jvmtiEnv *jvmti_env,

        JNIEnv* jni,

        jthread thread,

        jmethodID method,

        jlocation loc) {

    jclass cls;

    char fileName[512];

    nsk_jvmti_getFileName(redefineNumber, FILE_NAME, fileName,

                        sizeof(fileName)/sizeof(char));

    cls = jni->FindClass(SEARCH_NAME);

    printf("Agent::  Break Pont Reached..");

        nsk_printf("\nMyClass :: Successfully redefined..\n");

    } else {

        nsk_printf("\nMyClass :: Failed to redefine ..\n");

    }

}

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_hs204t002(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_hs204t002(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_hs204t002(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

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

    jint rc ;

    printf("Agent:: VM.. Started..\n");

    rc=vm->GetEnv((void **)&jvmti, JVMTI_VERSION_1_1);

    if (rc != JNI_OK) {

        printf("Agent:: Could not load JVMTI interface \n");

        return JNI_ERR;

    } else {

        jvmtiCapabilities caps;

        jvmtiEventCallbacks eventCallbacks;

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

        if (!nsk_jvmti_parseOptions(options)) {

            nsk_printf(" NSK Failed to parse..");

            return JNI_ERR;

        }

        /*

           required to set a prepareClassLoad not required call

           and setBreakPoint is required.

           and redefine is required..

         */

        caps.can_redefine_classes = 1;

        caps.can_generate_breakpoint_events=1;

        caps.can_redefine_classes = 1;

        jvmti->AddCapabilities(&caps);

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

        eventCallbacks.ClassPrepare = callbackClassPrepare;

        eventCallbacks.Breakpoint = callbackBreakpoint;

        rc=jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks));

        if (rc != JVMTI_ERROR_NONE) {

            printf("Agent:: Error occured while setting event call back \n");

            return JNI_ERR;

        }

        nsk_jvmti_enableNotification(jvmti, JVMTI_EVENT_CLASS_PREPARE , NULL);

        nsk_jvmti_enableNotification(jvmti, JVMTI_EVENT_BREAKPOINT, NULL);

    }

    return JNI_OK;

}

}