/*

 * Copyright (c) 2003, 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 <stdio.h>

#include <string.h>

#include "jvmti.h"

#include "jni_tools.h"

#include "agent_common.h"

#include "JVMTITools.h"

extern "C" {

#define STATUS_PASSED 0

#define STATUS_FAILED 2

static jvmtiEnv *jvmti = NULL;

static jvmtiEventCallbacks callbacks;

static jint result = STATUS_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);

}

static void

test_locals(jvmtiEnv *jvmti, jthread thr, jlocation location) {

    jvmtiError err;

    jint intVal;

    jlong longVal;

    jfloat floatVal;

    jdouble doubleVal;

    jobject obj;

    jint i;

    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]);

        char sig = table[i].signature[0];

        int slot = table[i].slot;

        if (sig == 'Z' || sig == 'B' || sig == 'C' || sig == 'S') {

            sig = 'I'; // covered by GetLocalInt

        }

        err = jvmti->GetLocalInt(thr, 0, slot, &intVal);

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

        if (err != JVMTI_ERROR_NONE && sig == 'I') {

            printf("FAIL: GetLocalInt failed to get value of int\n");

            result = STATUS_FAILED;

        } else if (err != JVMTI_ERROR_TYPE_MISMATCH && sig != 'I') {

            printf("FAIL: GetLocalInt did not return JVMTI_ERROR_TYPE_MISMATCH for non-int\n");

            result = STATUS_FAILED;

        }

        err = jvmti->GetLocalLong(thr, 0, slot, &longVal);

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

        if (err != JVMTI_ERROR_NONE && sig == 'J') {

            printf("FAIL: GetLocalLong failed to get value of long\n");

            result = STATUS_FAILED;

        } else if (err != JVMTI_ERROR_INVALID_SLOT &&

                   err != JVMTI_ERROR_TYPE_MISMATCH &&

                   sig != 'J') {

            printf("FAIL: GetLocalLong did not return JVMTI_ERROR_INVALID_SLOT"

                   " nor JVMTI_ERROR_TYPE_MISMATCH for non-long\n");

            result = STATUS_FAILED;

        }

        err = jvmti->GetLocalFloat(thr, 0, slot, &floatVal);

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

        if (err != JVMTI_ERROR_NONE && sig == 'F') {

            printf("FAIL: GetLocalFloat failed to get value of float\n");

            result = STATUS_FAILED;

        } else if (err != JVMTI_ERROR_TYPE_MISMATCH && sig != 'F') {

            printf("FAIL: GetLocalFloat did not return JVMTI_ERROR_TYPE_MISMATCH for non-float\n");

            result = STATUS_FAILED;

        }

        err = jvmti->GetLocalDouble(thr, 0, slot, &doubleVal);

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

        if (err != JVMTI_ERROR_NONE && sig == 'D') {

            printf("FAIL: GetLocalDouble failed to get value of double\n");

            result = STATUS_FAILED;

        } else if (err != JVMTI_ERROR_INVALID_SLOT &&

                   err != JVMTI_ERROR_TYPE_MISMATCH &&

                   sig != 'D') {

            printf("FAIL: GetLocalDouble did not return JVMTI_ERROR_INVALID_SLOT"

                   " nor JVMTI_ERROR_TYPE_MISMATCH for non-double\n");

            result = STATUS_FAILED;

        }

        err = jvmti->GetLocalObject(thr, 0, slot, &obj);

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

        if (err != JVMTI_ERROR_NONE && sig == 'L') {

            printf("FAIL: GetLocalObject failed to get value of object\n");

            result = STATUS_FAILED;

        } else if (err != JVMTI_ERROR_TYPE_MISMATCH && sig != 'L') {

            printf("FAIL: GetLocalObject did not return JVMTI_ERROR_TYPE_MISMATCH for non-object\n");

            result = STATUS_FAILED;

        }

    }

}

static void JNICALL

MethodExit(jvmtiEnv *jvmti_env,

           JNIEnv *env,

           jthread thr,

           jmethodID method,

           jboolean was_poped_by_exception,

           jvalue return_value) {

    jvmtiError err;

    jlocation location;

    jmethodID frame_method = NULL;

    if (mid != method) {

        return;

    }

    err = jvmti->GetFrameLocation(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\n",  ++methodExitCnt);

    test_locals(jvmti, thr, location);

    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;

    static jvmtiCapabilities caps;

    if (options != NULL && strcmp(options, "printdump") == 0) {

        printdump = JNI_TRUE;

    }

    res = jvm->GetEnv((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(&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_access_local_variables) {

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

        return JNI_ERR;

    }

    if (!caps.can_generate_method_exit_events) {

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

        return JNI_ERR;

    }

    callbacks.MethodExit = &MethodExit;

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

    if (err != JVMTI_ERROR_NONE) {

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

               TranslateError(err), err);

        return JNI_ERR;

    }

    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;

    }

    mid = env->GetStaticMethodID(cls, "staticMeth", "(I)I");

    if (mid == NULL) {

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

        result = STATUS_FAILED;

        return;

    }

    err = jvmti->GetLocalVariableTable(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_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) {

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

        result = STATUS_FAILED;

        return;

    }

    printf("\n checkLoc: START\n");

    mid = env->GetStaticMethodID(cls, "staticMeth", "(I)I");

    if (mid == NULL) {

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

        result = STATUS_FAILED;

        return;

    }

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

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

            if (err != JVMTI_ERROR_NONE) {

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

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

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

                result = STATUS_FAILED;

            }

        } else {

            if (err != JVMTI_ERROR_INVALID_SLOT) {

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

                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 overlapped:\n");

           print_LocalVariableEntry(&table[i]);

           print_LocalVariableEntry(&table[j]);

           overlap++;

           result = STATUS_FAILED;

        }

    }

    if (!overlap) {

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

    }

    printf("\n checkLoc: END\n\n");

    fflush(stdout);

}

JNIEXPORT jint JNICALL

Java_nsk_jvmti_unit_GetLocalVariable_getlocal003_getRes(JNIEnv *env, jclass cls) {

    return result;

}

}