1 /*
   2  * Copyright (c) 2004, 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 #include <string.h>
  25 #include "jvmti.h"
  26 #include "agent_common.h"
  27 #include "jni_tools.h"
  28 #include "jvmti_tools.h"
  29 
  30 extern "C" {
  31 
  32 /* scaffold objects */
  33 static jvmtiEnv *jvmti = NULL;
  34 static jlong timeout = 0;
  35 
  36 #define TESTED_CLASS_NAME   "nsk/jvmti/scenarios/bcinstr/BI01/bi01t001a"
  37 
  38 static jint newClassSize;
  39 static unsigned char* newClassBytes;
  40 static jvmtiClassDefinition oldClassDef;
  41 
  42 /* ============================================================================= */
  43 /*
  44  * Class:     nsk_jvmti_scenarios_bcinstr_BI01_bi01t001
  45  * Method:    setNewByteCode
  46  * Signature: ([B)Z
  47  */
  48 JNIEXPORT jboolean JNICALL
  49 Java_nsk_jvmti_scenarios_bcinstr_BI01_bi01t001_setNewByteCode(JNIEnv *jni_env,
  50                         jobject o, jbyteArray byteCode) {
  51 
  52     jbyte* elements;
  53     jboolean isCopy;
  54 
  55     newClassSize = jni_env->GetArrayLength(byteCode);
  56     if (!NSK_JNI_VERIFY(jni_env, newClassSize > 0)) {
  57         nsk_jvmti_setFailStatus();
  58         return NSK_FALSE;
  59     }
  60     NSK_DISPLAY1("\t... got array size: %d\n", newClassSize);
  61 
  62     elements = jni_env->GetByteArrayElements(byteCode, &isCopy);
  63     if (!NSK_JNI_VERIFY(jni_env, elements != NULL)) {
  64         nsk_jvmti_setFailStatus();
  65         return NSK_FALSE;
  66     }
  67     NSK_DISPLAY1("\t... got elements list: 0x%p\n", (void*)elements);
  68 
  69     if (!NSK_JVMTI_VERIFY(jvmti->Allocate(newClassSize, &newClassBytes))) {
  70         nsk_jvmti_setFailStatus();
  71         return NSK_FALSE;
  72     }
  73     NSK_DISPLAY1("\t... created bytes array: 0x%p\n", (void*)newClassBytes);
  74 
  75     {
  76         int j;
  77         for (j = 0; j < newClassSize; j++)
  78             newClassBytes[j] = (unsigned char)elements[j];
  79     }
  80     NSK_DISPLAY1("\t... copied bytecode: %d bytes\n", (int)newClassSize);
  81 
  82     NSK_DISPLAY1("\t... release elements list: 0x%p\n", (void*)elements);
  83     NSK_TRACE(jni_env->ReleaseByteArrayElements(byteCode, elements, JNI_ABORT));
  84     NSK_DISPLAY0("\t... released\n");
  85     return NSK_TRUE;
  86 }
  87 
  88 /* ============================================================================= */
  89 /*
  90  * Class:     nsk_jvmti_scenarios_bcinstr_BI01_bi01t001
  91  * Method:    setClass
  92  * Signature: (Ljava/lang/Class;)V
  93  */
  94 JNIEXPORT void JNICALL
  95 Java_nsk_jvmti_scenarios_bcinstr_BI01_bi01t001_setClass(JNIEnv *jni_env,
  96                         jobject o, jclass cls) {
  97 
  98     oldClassDef.klass = (jclass) jni_env->NewGlobalRef(cls);
  99     if (!NSK_JNI_VERIFY(jni_env, oldClassDef.klass != NULL)) {
 100         nsk_jvmti_setFailStatus();
 101     }
 102 }
 103 
 104 /* ============================================================================= */
 105 
 106 /** Callback function for ClassFileLoadHook event. */
 107 JNIEXPORT void JNICALL
 108 cbClassFileLoadHook(jvmtiEnv *jvmti_env, JNIEnv* jni_env,
 109             jclass class_being_redefined, jobject loader, const char* name,
 110             jobject protection_domain, jint class_data_len,
 111             const unsigned char* class_data, jint* new_class_data_len,
 112             unsigned char** new_class_data) {
 113 
 114     if (name == NULL || strcmp(name, TESTED_CLASS_NAME)) {
 115         return;
 116     }
 117 
 118     NSK_DISPLAY3("CLASS_FILE_LOAD_HOOK event: %s\n\treceived bytecode: 0x%p:%d\n",
 119                         name, (void *)class_data, class_data_len);
 120     if (nsk_getVerboseMode()) {
 121         nsk_printHexBytes("   ", 16, class_data_len, class_data);
 122     }
 123 
 124     {
 125         /*store original byte code, it will be used to do final redefinition*/
 126         int j;
 127         unsigned char *arr;
 128 
 129         oldClassDef.class_byte_count = class_data_len;
 130         if (!NSK_JVMTI_VERIFY(jvmti_env->Allocate(class_data_len, &arr))) {
 131             nsk_jvmti_setFailStatus();
 132             return;
 133         }
 134         for (j = 0; j < class_data_len; j++) {
 135             arr[j] = class_data[j];
 136         }
 137         oldClassDef.class_bytes = arr;
 138     }
 139 
 140     *new_class_data_len = newClassSize;
 141     *new_class_data = newClassBytes;
 142 
 143     NSK_DISPLAY2("Replace with new bytecode: 0x%p:%d\n",
 144                                 (void*)newClassBytes,
 145                                 (int)newClassSize);
 146     if (nsk_getVerboseMode()) {
 147         nsk_printHexBytes("   ", 16, newClassSize,
 148                                 newClassBytes);
 149     }
 150 }
 151 
 152 /* ============================================================================= */
 153 
 154 /** Agent algorithm. */
 155 static void JNICALL
 156 agentProc(jvmtiEnv* jvmti, JNIEnv* agentJNI, void* arg) {
 157 
 158     /*Wait for debuggee to read new byte codes nsk_jvmti_waitForSync#1*/
 159     NSK_DISPLAY0("Wait for debuggee to read new byte codes nsk_jvmti_waitForSync#1\n");
 160     if (!nsk_jvmti_waitForSync(timeout))
 161         return;
 162 
 163     if (!nsk_jvmti_resumeSync())
 164         return;
 165 
 166     NSK_DISPLAY0("Wait for debuggee to load tested class by classLoader\n");
 167     /*Wait for debuggee to load next class nsk_jvmti_waitForSync#2*/
 168     if (!nsk_jvmti_waitForSync(timeout))
 169         return;
 170 
 171     if (!nsk_jvmti_resumeSync())
 172         return;
 173 
 174     /*Wait for debuggee to check instrumentation code works nsk_jvmti_waitForSync#3*/
 175     NSK_DISPLAY0("Wait for debuggee to check instrumentation code works nsk_jvmti_waitForSync#3\n");
 176     if (!nsk_jvmti_waitForSync(timeout))
 177         return;
 178 
 179     NSK_DISPLAY0("Notification disabled for CLASS_FILE_LOAD_HOOK event\n");
 180     if (!NSK_JVMTI_VERIFY(jvmti->SetEventNotificationMode(JVMTI_DISABLE,
 181                                                           JVMTI_EVENT_CLASS_FILE_LOAD_HOOK,
 182                                                           NULL))) {
 183         nsk_jvmti_setFailStatus();
 184         return;
 185     }
 186 
 187     if (!nsk_jvmti_resumeSync())
 188         return;
 189 
 190     /*Wait for debuggee to set classes to be redefined nsk_jvmti_waitForSync#4*/
 191     NSK_DISPLAY0("Wait for debuggee to set classes to be redefined nsk_jvmti_waitForSync#4\n");
 192     if (!nsk_jvmti_waitForSync(timeout))
 193         return;
 194 
 195     NSK_DISPLAY0("Redfine class with old byte code\n");
 196     NSK_DISPLAY3("class definition:\n\t0x%p, 0x%p:%d\n",
 197                     oldClassDef.klass,
 198                     oldClassDef.class_bytes,
 199                     oldClassDef.class_byte_count);
 200     if (nsk_getVerboseMode()) {
 201         nsk_printHexBytes("   ", 16, oldClassDef.class_byte_count,
 202                                 oldClassDef.class_bytes);
 203     }
 204     if (!NSK_JVMTI_VERIFY(jvmti->RedefineClasses(1, &oldClassDef))) {
 205         nsk_jvmti_setFailStatus();
 206         return;
 207     }
 208 
 209     if (!nsk_jvmti_resumeSync())
 210         return;
 211 
 212     /*Wait for debuggee to check old byte code works nsk_jvmti_waitForSync#5*/
 213     NSK_DISPLAY0("Wait for debuggee to check old byte code works nsk_jvmti_waitForSync#5\n");
 214     if (!nsk_jvmti_waitForSync(timeout))
 215         return;
 216 
 217     agentJNI->DeleteGlobalRef(oldClassDef.klass);
 218 
 219     NSK_DISPLAY0("Let debuggee to finish\n");
 220     if (!nsk_jvmti_resumeSync())
 221         return;
 222 
 223 }
 224 
 225 /* ============================================================================= */
 226 
 227 /** Agent library initialization. */
 228 #ifdef STATIC_BUILD
 229 JNIEXPORT jint JNICALL Agent_OnLoad_bi01t001(JavaVM *jvm, char *options, void *reserved) {
 230     return Agent_Initialize(jvm, options, reserved);
 231 }
 232 JNIEXPORT jint JNICALL Agent_OnAttach_bi01t001(JavaVM *jvm, char *options, void *reserved) {
 233     return Agent_Initialize(jvm, options, reserved);
 234 }
 235 JNIEXPORT jint JNI_OnLoad_bi01t001(JavaVM *jvm, char *options, void *reserved) {
 236     return JNI_VERSION_1_8;
 237 }
 238 #endif
 239 jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
 240 
 241     if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))
 242         return JNI_ERR;
 243 
 244     timeout = nsk_jvmti_getWaitTime() * 60 * 1000;
 245 
 246     jvmti = nsk_jvmti_createJVMTIEnv(jvm, reserved);
 247     if (!NSK_VERIFY(jvmti != NULL))
 248         return JNI_ERR;
 249 
 250     {
 251         jvmtiCapabilities caps;
 252         memset(&caps, 0, sizeof(caps));
 253 
 254         caps.can_redefine_classes = 1;
 255         if (!NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&caps)))
 256             return JNI_ERR;
 257     }
 258 
 259     NSK_DISPLAY0("Set callback for CLASS_FILE_LOAD_HOOK event\n");
 260     {
 261         jvmtiEventCallbacks callbacks;
 262         jint size = (jint)sizeof(callbacks);
 263 
 264         memset(&callbacks, 0, size);
 265         callbacks.ClassFileLoadHook = cbClassFileLoadHook;
 266         if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&callbacks, size))) {
 267             return JNI_ERR;
 268         }
 269     }
 270 
 271     NSK_DISPLAY0("Set notification enabled for CLASS_FILE_LOAD_HOOK event\n");
 272     if (!NSK_JVMTI_VERIFY(jvmti->SetEventNotificationMode(JVMTI_ENABLE,
 273                                                           JVMTI_EVENT_CLASS_FILE_LOAD_HOOK,
 274                                                           NULL))) {
 275         nsk_jvmti_setFailStatus();
 276         return NSK_FALSE;
 277     }
 278 
 279     if (!NSK_VERIFY(nsk_jvmti_setAgentProc(agentProc, NULL)))
 280         return JNI_ERR;
 281 
 282     return JNI_OK;
 283 }
 284 
 285 /* ============================================================================= */
 286 
 287 
 288 }