/*

 * 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 BP_NUM 5 /* overall number of breakpoints */

#define STATUS_FAILED 2

#define PASSED 0

typedef struct {

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

    char *m_name;  /* method name */

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

    int loc;       /* breakpoint location in a method's body */

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

} breakpoint;

/* list of breakpoints */

static breakpoint breakpoints[] = {

    {1, (char*) "checkIt", (char*) "(Ljava/io/PrintStream;Z)I", 0, NULL},

    {1, (char*) "finMethod", (char*) "(JIJ)V", 5, NULL},

    {1, (char*) "finMethod", (char*) "(JIJ)V", 4, NULL},

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

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

};

static jclass redefCls; /* JNI's Java class object */

static jvmtiEnv *jvmti = NULL;

static jvmtiCapabilities caps;

static jvmtiEventCallbacks callbacks;

void JNICALL Breakpoint(jvmtiEnv *jvmti_env, JNIEnv *env,

        jthread thread, jmethodID method, jlocation location) {

}

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_redefclass008(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_redefclass008(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_redefclass008(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_generate_breakpoint_events) {

        callbacks.Breakpoint = &Breakpoint;

        err = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks));

        if (err != JVMTI_ERROR_NONE) {

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

                   TranslateError(err), err);

            return JNI_ERR;

        }

    } else {

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

    }

    return JNI_OK;

}

JNIEXPORT jint JNICALL

Java_nsk_jvmti_RedefineClasses_redefclass008_setBreakpoints(JNIEnv *env,

        jclass cls, jint vrb, jobject redefObj) {

    jvmtiError err;

    int i;

    if (!caps.can_redefine_classes || !caps.can_generate_breakpoint_events) {

        return PASSED;

    }

    redefCls = env->GetObjectClass(redefObj);

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

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

   signature m_sign */

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

            breakpoints[i].mid = env->GetMethodID(

                redefCls, breakpoints[i].m_name, breakpoints[i].m_sign);

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

                printf(

                    "%s: Failed to get the method ID for the instance method \"%s\" with signature \"%s\"\n",

                    __FILE__, breakpoints[i].m_name, breakpoints[i].m_sign);

                return STATUS_FAILED;

            }

        } else {                   /* a static method */

            breakpoints[i].mid = env->GetStaticMethodID(

                redefCls, breakpoints[i].m_name, breakpoints[i].m_sign);

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

                printf(

                    "%s: Failed to get the method ID for the static method \"%s\" with signature \"%s\"\n",

                    __FILE__, breakpoints[i].m_name, breakpoints[i].m_sign);

                return STATUS_FAILED;

            }

        }

        if (vrb == 1) {

            printf(

                ">>>>>>>> #%d Invoke SetBreakpoint():\n"

                "\tbreakpoint in the %s method: name=\"%s\"; "

                "signature=\"%s\"; location=%d\n",

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

                breakpoints[i].m_name, breakpoints[i].m_sign, breakpoints[i].loc);

        }

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

                    __FILE__, err, TranslateError(err));

            return STATUS_FAILED;

        }

        if (err != JVMTI_ERROR_NONE) {

            printf("Failed to enable BREAKPOINT event: %s (%d)\n",

                   TranslateError(err), err);

            return STATUS_FAILED;

        }

        if (vrb == 1)

            printf("<<<<<<<< #%d SetBreakpoint() is successfully done\n\n", i);

    }

    return PASSED;

}

JNIEXPORT jint JNICALL

Java_nsk_jvmti_RedefineClasses_redefclass008_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 || !caps.can_generate_breakpoint_events) {

        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 == 1)

        printf(">>>>>>>> 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 STATUS_FAILED;

    }

    if (vrb == 1)

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

    return PASSED;

}

JNIEXPORT jint JNICALL

Java_nsk_jvmti_RedefineClasses_redefclass008_getResult(JNIEnv *env,

        jclass cls, jint vrb, jobject redefObj) {

    jvmtiError err;

    int i;

    int totRes = PASSED;

    if (!caps.can_redefine_classes || !caps.can_generate_breakpoint_events) {

        return PASSED;

    }

    redefCls = env->GetObjectClass(redefObj);

/* all breakpoints should be cleared after the redefinition */

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

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

   signature m_sign */

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

            breakpoints[i].mid = env->GetMethodID(

                redefCls, breakpoints[i].m_name, breakpoints[i].m_sign);

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

                printf(

                    "%s: getResult: Failed to get the method ID for the instance method"

                    "\"%s\" with signature \"%s\"\n",

                    __FILE__, breakpoints[i].m_name, breakpoints[i].m_sign);

                return STATUS_FAILED;

            }

        } else {                   /* a static method */

            breakpoints[i].mid = env->GetStaticMethodID(

                redefCls, breakpoints[i].m_name, breakpoints[i].m_sign);

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

                printf(

                    "%s: getResult: Failed to get the method ID for the static method"

                    "\"%s\" with signature \"%s\"\n",

                    __FILE__, breakpoints[i].m_name, breakpoints[i].m_sign);

                return STATUS_FAILED;

            }

        }

            printf(

                "TEST FAILED: Breakpoint #%d in the %s method:\n"

                "\tname=\"%s\"; signature=\"%s\"; location=%d was not cleared:\n"

                "\tClearBreakpoint() returned the error %d: %s\n\n",

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

                breakpoints[i].m_name, breakpoints[i].m_sign,

                breakpoints[i].loc, err, TranslateError(err));

            totRes = STATUS_FAILED;

        } else {

            if (vrb == 1) {

                printf(

                    "Check #%d PASSED: Breakpoint in the %s method:\n"

                    "\tname=\"%s\"; signature=\"%s\"; location=%d was cleared:\n"

                    "\tClearBreakpoint() returned the error %d: %s\n\n",

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

                    breakpoints[i].m_name, breakpoints[i].m_sign,

                    breakpoints[i].loc, err, TranslateError(err));

            }

                printf(

                    "TEST FAILED: the function SetBreakpoint() returned the error %d: %s\n"

                    "\ti.e. the breakpoint #%d has not been really cleared.\n\n",

                    err, TranslateError(err), i);

                totRes = STATUS_FAILED;

            }

        }

    }

    return totRes;

}

}