/*

 * 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 "jni_tools.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 jvmtiCapabilities caps;

static jvmtiEventCallbacks callbacks;

static jint result = PASSED;

static jboolean printdump = JNI_FALSE;

static jmethodID mid = NULL;

static jvmtiLocalVariableEntry *table = NULL;

static jint entryCount = 0;

static jint methodExitCnt = -1;

void print_LocalVariableEntry(jvmtiLocalVariableEntry *lvt_elem) {

  printf("\n Var name: %s, slot: %d", lvt_elem->name, lvt_elem->slot);

  printf(", start_bci: %"LL"d", lvt_elem->start_location);

  printf(", end_bci: %"LL"d",   lvt_elem->start_location + lvt_elem->length);

  printf(", signature: %s\n", lvt_elem->signature);

}

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

        jthread thr, jmethodID method,

        jboolean was_poped_by_exception, jvalue return_value) {

    jvmtiError err;

    jint i;

    jmethodID frame_method;

    jlocation location;

    jint intVal;

    jfloat floatVal;

    jdouble doubleVal;

    jobject obj;

    if (mid == method) {

        err = (*jvmti_env)->GetFrameLocation(jvmti_env, thr, 0,

                                             &frame_method, &location);

        if (err != JVMTI_ERROR_NONE) {

            printf("\t failure: %s (%d)\n", TranslateError(err), err);

            result = STATUS_FAILED;

            return;

        }

        if (frame_method != method) {

            printf("\t failure: GetFrameLocation returned wrong jmethodID\n");

            result = STATUS_FAILED;

            return;

        }

        printf("\n MethodExit: BEGIN %d, Current frame bci: %"LL"d\n\n",

                ++methodExitCnt, location);

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

            if (table[i].start_location > location ||

                table[i].start_location + table[i].length < location) {

                continue;  /* The local variable is not visible */

            }

            print_LocalVariableEntry(&table[i]);

            err = (*jvmti)->GetLocalInt(jvmti, thr, 0, table[i].slot, &intVal);

            printf(" GetLocalInt:     %s (%d)\n", TranslateError(err), err);

            if (err != JVMTI_ERROR_NONE && table[i].signature[0] == 'I') {

                result = STATUS_FAILED;

            }

            err = (*jvmti)->GetLocalFloat(jvmti, thr, 0, table[i].slot, &floatVal);

            printf(" GetLocalFloat:   %s (%d)\n", TranslateError(err), err);

            if (err != JVMTI_ERROR_NONE && table[i].signature[0] == 'F') {

                result = STATUS_FAILED;

            }

            err = (*jvmti)->GetLocalDouble(jvmti, thr, 0, table[i].slot, &doubleVal);

            printf(" GetLocalDouble:  %s (%d)\n", TranslateError(err), err);

            if (err != JVMTI_ERROR_NONE && table[i].signature[0] == 'D') {

                result = STATUS_FAILED;

            }

            err = (*jvmti)->GetLocalObject(jvmti, thr, 0, table[i].slot, &obj);

            printf(" GetLocalObject:  %s (%d)\n", TranslateError(err), err);

            if (err != JVMTI_ERROR_NONE && table[i].signature[0] == 'L') {

                result = STATUS_FAILED;

            }

        }

        printf("\n MethodExit: END %d\n\n", methodExitCnt);

        fflush(stdout);

    }

}

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_getlocal003(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_getlocal003(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_getlocal003(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;

    }

    err = (*jvmti)->GetPotentialCapabilities(jvmti, &caps);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        return JNI_ERR;

    }

    err = (*jvmti)->AddCapabilities(jvmti, &caps);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        return JNI_ERR;

    }

    err = (*jvmti)->GetCapabilities(jvmti, &caps);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        return JNI_ERR;

    }

    if (!caps.can_access_local_variables) {

        printf("Warning: Access to local variables is not implemented\n");

    } else if (caps.can_generate_method_exit_events) {

        callbacks.MethodExit = &MethodExit;

        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;

        }

    } else {

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

    }

    return JNI_OK;

}

JNIEXPORT void JNICALL

Java_nsk_jvmti_unit_GetLocalVariable_getlocal003_getMeth(JNIEnv *env, jclass cls) {

    jvmtiError err;

    if (jvmti == NULL) {

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

        result = STATUS_FAILED;

        return;

    }

    if (!caps.can_access_local_variables ||

        !caps.can_generate_method_exit_events) return;

    mid = JNI_ENV_PTR(env)->GetStaticMethodID(JNI_ENV_ARG(env, cls),

                                              "staticMeth", "(I)I");

    if (mid == NULL) {

        printf("Cannot find Method ID for staticMeth\n");

        result = STATUS_FAILED;

        return;

    }

    err = (*jvmti)->GetLocalVariableTable(jvmti, mid, &entryCount, &table);

    if (err != JVMTI_ERROR_NONE) {

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

                   TranslateError(err), err);

            result = STATUS_FAILED;

            return;

    }

    err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,

        JVMTI_EVENT_METHOD_EXIT, NULL);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

    fflush(stdout);

}

JNIEXPORT void JNICALL

Java_nsk_jvmti_unit_GetLocalVariable_getlocal003_checkLoc(JNIEnv *env,

        jclass cls, jthread thr) {

    jvmtiError err;

    jvmtiLocalVariableEntry *table;

    jint entryCount;

    jmethodID mid;

    jint locVar;

    jint i, j;

    int  overlap = 0;

    if (jvmti == NULL) {

        return;

    }

    mid = JNI_ENV_PTR(env)->GetStaticMethodID(JNI_ENV_ARG(env, cls),

                                              "staticMeth", "(I)I");

    if (mid == NULL) {

        printf("Cannot find Method ID for staticMeth\n");

        result = STATUS_FAILED;

        return;

    }

    err = (*jvmti)->GetLocalVariableTable(jvmti, mid, &entryCount, &table);

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        result = STATUS_FAILED;

        return;

    }

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

        print_LocalVariableEntry(&table[i]);

        err = (*jvmti)->GetLocalInt(jvmti, thr, 1, table[i].slot, &locVar);

        printf(" GetLocalInt: %s (%d)\n", TranslateError(err), err);

        if (strcmp(table[i].name, "intArg") == 0) {

            if (err != JVMTI_ERROR_NONE) {

               printf(" failure: JVMTI_ERROR_NONE is expected\n");

               result = STATUS_FAILED;

            }

        }

        else if (strcmp(table[i].name, "pi") == 0) {

            if (err != JVMTI_ERROR_TYPE_MISMATCH) {

               printf(" failure: JVMTI_ERROR_TYPE_MISMATCH is expected\n");

               result = STATUS_FAILED;

            }

        } else {

            if (err != JVMTI_ERROR_INVALID_SLOT) {

                printf(" failure: JVMTI_ERROR_INVALID_SLOT is expected\n");

                result = STATUS_FAILED;

            }

        }

        if (table[i].slot != 2) {

           continue;

        }

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

           /* We do cross checks between all variables having slot #2.

            * No overlapping between location ranges are allowed.

            */

           if (table[j].slot != 2 || i == j) {

              continue;

           }

           if (table[i].start_location > table[j].start_location + table[j].length ||

               table[j].start_location > table[i].start_location + table[i].length

           ) {

               continue; /* Everything is Ok */

           }

           printf(" failure: locations of vars with slot #2 are overlaped:\n");

           print_LocalVariableEntry(&table[i]);

           print_LocalVariableEntry(&table[j]);

           overlap++;

           result = STATUS_FAILED;

        }

    }

    if (!overlap) {

        printf("\n Succes: locations of vars with slot #2 are NOT overlaped\n\n");

    }

    fflush(stdout);

}

JNIEXPORT jint JNICALL

Java_nsk_jvmti_unit_GetLocalVariable_getlocal003_getRes(JNIEnv *env, jclass cls) {

    return result;

}

#ifdef __cplusplus

}

#endif