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