/*

 * Copyright (c) 2007, 2019, 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 <jni.h>

#include <jvmti.h>

#include "agent_common.h"

#include <string.h>

#include "jvmti_tools.h"

#include "JVMTITools.h"

/*

    hs202t001:

        1. Set breakpoints in several methods when Object.wait(),

        Object.notify(), Object.notifyAll() are in use in these methods.

        2. Upon reaching a breakpoint, enable SingleStep.

        3. Redefine an java.lang.Object class within SingleStep callback

        when one of its methods is called by the tested method.

        4. Pop a currently executed frame.

*/

extern "C" {

#define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS202/hs203t001/MyObject"

#define CLASS_NAME "Lnsk/jvmti/scenarios/hotswap/HS202/hs203t001/MyObject;"

#define METHOD_NAME "leaveMonitor"

#define METHOD_SIGN "()V"

#define METHOD_NOTIFYALL "notifyAll"

static jvmtiEnv * jvmti;

JNIEXPORT void JNICALL callbackClassPrepare(jvmtiEnv *jvmti,

                                        JNIEnv* jni,

                                        jthread thread,

                                        jclass klass) {

    char * className;

    char * generic;

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

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

        jmethodID method;

        method = jni->GetMethodID(klass, METHOD_NAME, METHOD_SIGN);

        if (method == NULL) {

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

        } else {

            jlocation start;

            jlocation end;

            jvmtiError err ;

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

            if (err != JVMTI_ERROR_NONE) {

                nsk_printf(" ## Error occured %s \n",TranslateError(err));

            }else {

                nsk_printf("\n Start = %d and end = %d ", start , end);

                nsk_printf(" setting break points..");

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

                if (err != JVMTI_ERROR_NONE) {

                    nsk_printf(" ## Error occured %s \n",TranslateError(err));

                } else  {

                    nsk_printf(" NO ERRORS ");

                    if (nsk_jvmti_enableNotification(jvmti,JVMTI_EVENT_BREAKPOINT, NULL)) {

                        nsk_printf(" Enabled.. notification event ..\n");

                    }

                }

            }

        }

    }

}

/*

 *This event call back will be called when a filed

 *threadState is beeing upodated or beeing used in

 *the program java flow.

 *In this current example the code will be called

 */

void JNICALL callbackSingleStep(jvmtiEnv *jvmti_env,

        JNIEnv* jni,

        jthread thread,

        jmethodID method,

        jlocation location) {

    jvmtiError err;

    char * name;

    char * signature;

    char * generic ;

    err = JVMTI_ERROR_NONE;

    jvmti_env->GetMethodName(method, &name, &signature, &generic);

    if (strcmp(name,METHOD_NAME) == 0) { /* same method */

        jclass cls;

        jmethodID mem ;

        jvmti_env->GetMethodDeclaringClass(method, &cls);

        mem=jni->GetMethodID(cls,METHOD_NOTIFYALL,"()V");

        jni->CallVoidMethod(thread,mem);

    }

}

void JNICALL callbackBreakpoint(jvmtiEnv *jvmti_env,

        JNIEnv* jni_env,

        jthread thread,

        jmethodID method,

        jlocation location) {

    jvmtiError err;

    err = JVMTI_ERROR_NONE;

    if (nsk_jvmti_enableNotification(jvmti,JVMTI_EVENT_SINGLE_STEP, NULL)) {

        nsk_printf(" Enabled.. notification event ..");

    }

    err= jvmti->SetEventNotificationMode(JVMTI_DISABLE,

            JVMTI_EVENT_BREAKPOINT, NULL);

    if (err == JVMTI_ERROR_NONE) {

        nsk_printf(" Disabled notification..");

    }

}

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_hs202t001(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_hs202t001(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_hs202t001(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

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

    jvmtiError rc;

    jint code;

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

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

    if (code != JNI_OK) {

        nsk_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("# error agent Failed to parse options \n");

            return JNI_ERR;

        }

        caps.can_redefine_classes = 1;

        caps.can_suspend = 1;

        caps.can_pop_frame = 1;

        caps.can_generate_all_class_hook_events = 1;

        caps.can_generate_compiled_method_load_events = 1;

        caps.can_generate_breakpoint_events=1;

        caps.can_generate_single_step_events=1;

        jvmti->AddCapabilities(&caps);

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

        eventCallbacks.ClassPrepare =callbackClassPrepare;

        eventCallbacks.SingleStep =callbackSingleStep;

        eventCallbacks.Breakpoint =callbackBreakpoint;

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

        if (rc != JVMTI_ERROR_NONE) {

            nsk_printf(" ## Error occured %s \n",TranslateError(rc));

            return JNI_ERR;

        }

        if (nsk_jvmti_enableNotification(jvmti,JVMTI_EVENT_CLASS_PREPARE, NULL)) {

            nsk_printf("Agent :: NOTIFICATIONS ARE ENABLED \n");

        } else {

            nsk_printf(" Error in Eanableing Notifications..");

        }

    }

    return JNI_OK;

}

JNIEXPORT jboolean JNICALL

Java_nsk_jvmti_scenarios_hotswap_HS202_hs202t001_hs202t001_popThreadFrame(JNIEnv * jni,

        jclass clas,

        jthread thread) {

    jvmtiError err ;

    jboolean retvalue;

    jint state;

    nsk_printf("Agent:: POPING THE FRAME....\n");

    retvalue = JNI_FALSE;

    jvmti->GetThreadState(thread, &state);

    if (state & JVMTI_THREAD_STATE_SUSPENDED) {

        err = jvmti->PopFrame(thread);

        if (err == JVMTI_ERROR_NONE) {

            nsk_printf("Agent:: NO Errors poped very well ..\n");

            retvalue=JNI_OK;

            return retvalue;

        } else if (err != JVMTI_ERROR_NONE) {

            nsk_printf(" ## Error occured %s \n",TranslateError(err));

        }

        nsk_printf("Agent:: some other error ..\n");

    } else {

        nsk_printf("Agent:: Thread was not suspened.. check for capabilities, and java method signature ");

    }

    return retvalue;

}

JNIEXPORT jboolean JNICALL

Java_nsk_jvmti_scenarios_hotswap_HS202_hs202t001_hs202t001_resumeThread(JNIEnv * jni,

                                                                           jclass clas,

                                                                           jthread thread) {

    jvmtiError err ;

    jboolean retvalue;

    retvalue = JNI_FALSE;

    err = jvmti->ResumeThread(thread);

    if (err == JVMTI_ERROR_NONE) {

        nsk_printf(" Agent:: Thread Resumed.. \n");

        retvalue=JNI_OK;

    } else {

        nsk_printf(" Agent:: Failed.. to Resume the thread.\n");

    }

    return retvalue;

}

}