1 /*

     2  * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 /**

    24  * Please see the ./hs301t002.README file for detailed explanation of this testcase.

    25  *

    26  */

    27 #include <jni.h>

    28 #include <jvmti.h>

    29 #include "agent_common.h"

    30 #include <string.h>

    31 #include "jvmti_tools.h"

    32 #include "jni_tools.h"

    33 

    34 #ifdef __cplusplus

    35 extern "C" {

    36 #endif

    37 #define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS301/hs301t002/MyClass"

    38 #define DIR_NAME "newclass"

    39 #define PATH_FORMAT "%s%02d/%s"

    40 #define SEARCH_NAME "nsk/jvmti/scenarios/hotswap/HS301/hs301t002/MyClass"

    41 

    42 static jvmtiEnv * jvmti;

    43 

    44 #ifdef STATIC_BUILD

    45 JNIEXPORT jint JNICALL Agent_OnLoad_hs301t002(JavaVM *jvm, char *options, void *reserved) {

    46     return Agent_Initialize(jvm, options, reserved);

    47 }

    48 JNIEXPORT jint JNICALL Agent_OnAttach_hs301t002(JavaVM *jvm, char *options, void *reserved) {

    49     return Agent_Initialize(jvm, options, reserved);

    50 }

    51 JNIEXPORT jint JNI_OnLoad_hs301t002(JavaVM *jvm, char *options, void *reserved) {

    52     return JNI_VERSION_1_8;

    53 }

    54 #endif

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

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

    57     if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB3(GetEnv, vm,

    58                     (void **)&jvmti, JVMTI_VERSION_1_1) ) ) {

    59         nsk_printf(" Agent ::Agent failed to get jvmti env.\n");

    60         return JNI_ERR;

    61     } else {

    62         jvmtiCapabilities caps;

    63         if (nsk_jvmti_parseOptions(options) == NSK_FALSE ) {

    64             nsk_printf(" Agent:: ## error agent Failed to parse options.\n");

    65             return JNI_ERR;

    66         }

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

    68         caps.can_redefine_classes = 1;

    69         if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB2(AddCapabilities, jvmti, &caps) ) ) {

    70             nsk_printf(" Agent:: Error occured while adding capabilities.\n");

    71             return JNI_ERR;

    72         }

    73     }

    74     return JNI_OK;

    75 }

    76 

    77 /**

    78  * fixed JNI  signature, and droped jclass clsa (paramter from here as it was not used).

    79  *

    80  */

    81 JNIEXPORT jboolean JNICALL

    82 Java_nsk_jvmti_scenarios_hotswap_HS301_hs301t002_hs301t002_redefine(JNIEnv * jni, jobject obj) {

    83     jclass cls;

    84     jboolean ret;

    85     char fileName[512];

    86     int redefineNumber ;

    87 

    88     redefineNumber=0;

    89     ret = JNI_FALSE;

    90     if (!NSK_JNI_VERIFY(jni, (cls = NSK_CPP_STUB2(FindClass, jni, SEARCH_NAME)) != NULL)) {

    91         nsk_printf("Agent:: (*JNI)->FindClass(jni, %s) returns `null`.\n", SEARCH_NAME);

    92         return NSK_FALSE;

    93     }

    94     nsk_jvmti_getFileName(redefineNumber, FILE_NAME, fileName,

    95                         sizeof(fileName)/sizeof(char));

    96     if ( nsk_jvmti_redefineClass(jvmti, cls, fileName) == NSK_TRUE) {

    97         nsk_printf("Agent:: MyClass :: Successfully redefined.\n");

    98         ret = JNI_TRUE;

    99     } else {

   100         nsk_printf("Agent:: MyClass :: Failed to redefine.\n");

   101     }

   102     return ret;

   103 }

   104 

   105 #ifdef __cplusplus

   106 }

   107 #endif