1 /* 2 * Copyright (c) 2003, 2010, 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 25 #include "precompiled.hpp" 26 #include "classfile/systemDictionary.hpp" 27 #include "classfile/vmSymbols.hpp" 28 #include "interpreter/bytecodeStream.hpp" 29 #include "interpreter/interpreter.hpp" 30 #include "jvmtifiles/jvmtiEnv.hpp" 31 #include "memory/resourceArea.hpp" 32 #include "memory/universe.inline.hpp" 33 #include "oops/cpCacheOop.hpp" 34 #include "oops/instanceKlass.hpp" 35 #include "prims/jniCheck.hpp" 36 #include "prims/jvm_misc.hpp" 37 #include "prims/jvmtiAgentThread.hpp" 38 #include "prims/jvmtiClassFileReconstituter.hpp" 39 #include "prims/jvmtiCodeBlobEvents.hpp" 40 #include "prims/jvmtiExtensions.hpp" 41 #include "prims/jvmtiGetLoadedClasses.hpp" 42 #include "prims/jvmtiImpl.hpp" 43 #include "prims/jvmtiManageCapabilities.hpp" 44 #include "prims/jvmtiRedefineClasses.hpp" 45 #include "prims/jvmtiTagMap.hpp" 46 #include "prims/jvmtiThreadState.inline.hpp" 47 #include "prims/jvmtiUtil.hpp" 48 #include "runtime/arguments.hpp" 49 #include "runtime/deoptimization.hpp" 50 #include "runtime/interfaceSupport.hpp" 51 #include "runtime/javaCalls.hpp" 52 #include "runtime/jfieldIDWorkaround.hpp" 53 #include "runtime/objectMonitor.inline.hpp" 54 #include "runtime/osThread.hpp" 55 #include "runtime/reflectionUtils.hpp" 56 #include "runtime/signature.hpp" 57 #include "runtime/vframe.hpp" 58 #include "runtime/vmThread.hpp" 59 #include "services/threadService.hpp" 60 #include "utilities/exceptions.hpp" 61 #include "utilities/preserveException.hpp" 62 #ifdef TARGET_OS_FAMILY_linux 63 # include "thread_linux.inline.hpp" 64 #endif 65 #ifdef TARGET_OS_FAMILY_solaris 66 # include "thread_solaris.inline.hpp" 67 #endif 68 #ifdef TARGET_OS_FAMILY_windows 69 # include "thread_windows.inline.hpp" 70 #endif 71 72 73 74 #define FIXLATER 0 // REMOVE this when completed. 75 76 // FIXLATER: hook into JvmtiTrace 77 #define TraceJVMTICalls false 78 79 JvmtiEnv::JvmtiEnv(jint version) : JvmtiEnvBase(version) { 80 } 81 82 JvmtiEnv::~JvmtiEnv() { 83 } 84 85 JvmtiEnv* 86 JvmtiEnv::create_a_jvmti(jint version) { 87 return new JvmtiEnv(version); 88 } 89 90 // VM operation class to copy jni function table at safepoint. 91 // More than one java threads or jvmti agents may be reading/ 92 // modifying jni function tables. To reduce the risk of bad 93 // interaction b/w these threads it is copied at safepoint. 94 class VM_JNIFunctionTableCopier : public VM_Operation { 95 private: 96 const struct JNINativeInterface_ *_function_table; 97 public: 98 VM_JNIFunctionTableCopier(const struct JNINativeInterface_ *func_tbl) { 99 _function_table = func_tbl; 100 }; 101 102 VMOp_Type type() const { return VMOp_JNIFunctionTableCopier; } 103 void doit() { 104 copy_jni_function_table(_function_table); 105 }; 106 }; 107 108 // 109 // Do not change the "prefix" marker below, everything above it is copied 110 // unchanged into the filled stub, everything below is controlled by the 111 // stub filler (only method bodies are carried forward, and then only for 112 // functionality still in the spec). 113 // 114 // end file prefix 115 116 // 117 // Memory Management functions 118 // 119 120 // mem_ptr - pre-checked for NULL 121 jvmtiError 122 JvmtiEnv::Allocate(jlong size, unsigned char** mem_ptr) { 123 return allocate(size, mem_ptr); 124 } /* end Allocate */ 125 126 127 // mem - NULL is a valid value, must be checked 128 jvmtiError 129 JvmtiEnv::Deallocate(unsigned char* mem) { 130 return deallocate(mem); 131 } /* end Deallocate */ 132 133 // Threads_lock NOT held, java_thread not protected by lock 134 // java_thread - pre-checked 135 // data - NULL is a valid value, must be checked 136 jvmtiError 137 JvmtiEnv::SetThreadLocalStorage(JavaThread* java_thread, const void* data) { 138 JvmtiThreadState* state = java_thread->jvmti_thread_state(); 139 if (state == NULL) { 140 if (data == NULL) { 141 // leaving state unset same as data set to NULL 142 return JVMTI_ERROR_NONE; 143 } 144 // otherwise, create the state 145 state = JvmtiThreadState::state_for(java_thread); 146 if (state == NULL) { 147 return JVMTI_ERROR_THREAD_NOT_ALIVE; 148 } 149 } 150 state->env_thread_state(this)->set_agent_thread_local_storage_data((void*)data); 151 return JVMTI_ERROR_NONE; 152 } /* end SetThreadLocalStorage */ 153 154 155 // Threads_lock NOT held 156 // thread - NOT pre-checked 157 // data_ptr - pre-checked for NULL 158 jvmtiError 159 JvmtiEnv::GetThreadLocalStorage(jthread thread, void** data_ptr) { 160 JavaThread* current_thread = JavaThread::current(); 161 if (thread == NULL) { 162 JvmtiThreadState* state = current_thread->jvmti_thread_state(); 163 *data_ptr = (state == NULL) ? NULL : 164 state->env_thread_state(this)->get_agent_thread_local_storage_data(); 165 } else { 166 167 // jvmti_GetThreadLocalStorage is "in native" and doesn't transition 168 // the thread to _thread_in_vm. However, when the TLS for a thread 169 // other than the current thread is required we need to transition 170 // from native so as to resolve the jthread. 171 172 ThreadInVMfromNative __tiv(current_thread); 173 __ENTRY(jvmtiError, JvmtiEnv::GetThreadLocalStorage , current_thread) 174 debug_only(VMNativeEntryWrapper __vew;) 175 176 oop thread_oop = JNIHandles::resolve_external_guard(thread); 177 if (thread_oop == NULL) { 178 return JVMTI_ERROR_INVALID_THREAD; 179 } 180 if (!thread_oop->is_a(SystemDictionary::Thread_klass())) { 181 return JVMTI_ERROR_INVALID_THREAD; 182 } 183 JavaThread* java_thread = java_lang_Thread::thread(thread_oop); 184 if (java_thread == NULL) { 185 return JVMTI_ERROR_THREAD_NOT_ALIVE; 186 } 187 JvmtiThreadState* state = java_thread->jvmti_thread_state(); 188 *data_ptr = (state == NULL) ? NULL : 189 state->env_thread_state(this)->get_agent_thread_local_storage_data(); 190 } 191 return JVMTI_ERROR_NONE; 192 } /* end GetThreadLocalStorage */ 193 194 // 195 // Class functions 196 // 197 198 // class_count_ptr - pre-checked for NULL 199 // classes_ptr - pre-checked for NULL 200 jvmtiError 201 JvmtiEnv::GetLoadedClasses(jint* class_count_ptr, jclass** classes_ptr) { 202 return JvmtiGetLoadedClasses::getLoadedClasses(this, class_count_ptr, classes_ptr); 203 } /* end GetLoadedClasses */ 204 205 206 // initiating_loader - NULL is a valid value, must be checked 207 // class_count_ptr - pre-checked for NULL 208 // classes_ptr - pre-checked for NULL 209 jvmtiError 210 JvmtiEnv::GetClassLoaderClasses(jobject initiating_loader, jint* class_count_ptr, jclass** classes_ptr) { 211 return JvmtiGetLoadedClasses::getClassLoaderClasses(this, initiating_loader, 212 class_count_ptr, classes_ptr); 213 } /* end GetClassLoaderClasses */ 214 215 // k_mirror - may be primitive, this must be checked 216 // is_modifiable_class_ptr - pre-checked for NULL 217 jvmtiError 218 JvmtiEnv::IsModifiableClass(oop k_mirror, jboolean* is_modifiable_class_ptr) { 219 *is_modifiable_class_ptr = VM_RedefineClasses::is_modifiable_class(k_mirror)? 220 JNI_TRUE : JNI_FALSE; 221 return JVMTI_ERROR_NONE; 222 } /* end IsModifiableClass */ 223 224 // class_count - pre-checked to be greater than or equal to 0 225 // classes - pre-checked for NULL 226 jvmtiError 227 JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) { 228 //TODO: add locking 229 230 int index; 231 JavaThread* current_thread = JavaThread::current(); 232 ResourceMark rm(current_thread); 233 234 jvmtiClassDefinition* class_definitions = 235 NEW_RESOURCE_ARRAY(jvmtiClassDefinition, class_count); 236 NULL_CHECK(class_definitions, JVMTI_ERROR_OUT_OF_MEMORY); 237 238 for (index = 0; index < class_count; index++) { 239 HandleMark hm(current_thread); 240 241 jclass jcls = classes[index]; 242 oop k_mirror = JNIHandles::resolve_external_guard(jcls); 243 if (k_mirror == NULL) { 244 return JVMTI_ERROR_INVALID_CLASS; 245 } 246 if (!k_mirror->is_a(SystemDictionary::Class_klass())) { 247 return JVMTI_ERROR_INVALID_CLASS; 248 } 249 250 if (java_lang_Class::is_primitive(k_mirror)) { 251 return JVMTI_ERROR_UNMODIFIABLE_CLASS; 252 } 253 254 klassOop k_oop = java_lang_Class::as_klassOop(k_mirror); 255 KlassHandle klass(current_thread, k_oop); 256 257 jint status = klass->jvmti_class_status(); 258 if (status & (JVMTI_CLASS_STATUS_ERROR)) { 259 return JVMTI_ERROR_INVALID_CLASS; 260 } 261 if (status & (JVMTI_CLASS_STATUS_ARRAY)) { 262 return JVMTI_ERROR_UNMODIFIABLE_CLASS; 263 } 264 265 instanceKlassHandle ikh(current_thread, k_oop); 266 if (ikh->get_cached_class_file_bytes() == NULL) { 267 // not cached, we need to reconstitute the class file from VM representation 268 constantPoolHandle constants(current_thread, ikh->constants()); 269 ObjectLocker ol(constants, current_thread); // lock constant pool while we query it 270 271 JvmtiClassFileReconstituter reconstituter(ikh); 272 if (reconstituter.get_error() != JVMTI_ERROR_NONE) { 273 return reconstituter.get_error(); 274 } 275 276 class_definitions[index].class_byte_count = (jint)reconstituter.class_file_size(); 277 class_definitions[index].class_bytes = (unsigned char*) 278 reconstituter.class_file_bytes(); 279 } else { 280 // it is cached, get it from the cache 281 class_definitions[index].class_byte_count = ikh->get_cached_class_file_len(); 282 class_definitions[index].class_bytes = ikh->get_cached_class_file_bytes(); 283 } 284 class_definitions[index].klass = jcls; 285 } 286 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform); 287 VMThread::execute(&op); 288 return (op.check_error()); 289 } /* end RetransformClasses */ 290 291 292 // class_count - pre-checked to be greater than or equal to 0 293 // class_definitions - pre-checked for NULL 294 jvmtiError 295 JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_definitions) { 296 //TODO: add locking 297 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine); 298 VMThread::execute(&op); 299 return (op.check_error()); 300 } /* end RedefineClasses */ 301 302 303 // 304 // Object functions 305 // 306 307 // size_ptr - pre-checked for NULL 308 jvmtiError 309 JvmtiEnv::GetObjectSize(jobject object, jlong* size_ptr) { 310 oop mirror = JNIHandles::resolve_external_guard(object); 311 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT); 312 313 if (mirror->klass() == SystemDictionary::Class_klass()) { 314 if (!java_lang_Class::is_primitive(mirror)) { 315 mirror = java_lang_Class::as_klassOop(mirror); 316 assert(mirror != NULL, "class for non-primitive mirror must exist"); 317 } 318 } 319 320 *size_ptr = mirror->size() * wordSize; 321 return JVMTI_ERROR_NONE; 322 } /* end GetObjectSize */ 323 324 // 325 // Method functions 326 // 327 328 // prefix - NULL is a valid value, must be checked 329 jvmtiError 330 JvmtiEnv::SetNativeMethodPrefix(const char* prefix) { 331 return prefix == NULL? 332 SetNativeMethodPrefixes(0, NULL) : 333 SetNativeMethodPrefixes(1, (char**)&prefix); 334 } /* end SetNativeMethodPrefix */ 335 336 337 // prefix_count - pre-checked to be greater than or equal to 0 338 // prefixes - pre-checked for NULL 339 jvmtiError 340 JvmtiEnv::SetNativeMethodPrefixes(jint prefix_count, char** prefixes) { 341 // Have to grab JVMTI thread state lock to be sure that some thread 342 // isn't accessing the prefixes at the same time we are setting them. 343 // No locks during VM bring-up. 344 if (Threads::number_of_threads() == 0) { 345 return set_native_method_prefixes(prefix_count, prefixes); 346 } else { 347 MutexLocker mu(JvmtiThreadState_lock); 348 return set_native_method_prefixes(prefix_count, prefixes); 349 } 350 } /* end SetNativeMethodPrefixes */ 351 352 // 353 // Event Management functions 354 // 355 356 // callbacks - NULL is a valid value, must be checked 357 // size_of_callbacks - pre-checked to be greater than or equal to 0 358 jvmtiError 359 JvmtiEnv::SetEventCallbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks) { 360 JvmtiEventController::set_event_callbacks(this, callbacks, size_of_callbacks); 361 return JVMTI_ERROR_NONE; 362 } /* end SetEventCallbacks */ 363 364 365 // event_thread - NULL is a valid value, must be checked 366 jvmtiError 367 JvmtiEnv::SetEventNotificationMode(jvmtiEventMode mode, jvmtiEvent event_type, jthread event_thread, ...) { 368 JavaThread* java_thread = NULL; 369 if (event_thread != NULL) { 370 oop thread_oop = JNIHandles::resolve_external_guard(event_thread); 371 if (thread_oop == NULL) { 372 return JVMTI_ERROR_INVALID_THREAD; 373 } 374 if (!thread_oop->is_a(SystemDictionary::Thread_klass())) { 375 return JVMTI_ERROR_INVALID_THREAD; 376 } 377 java_thread = java_lang_Thread::thread(thread_oop); 378 if (java_thread == NULL) { 379 return JVMTI_ERROR_THREAD_NOT_ALIVE; 380 } 381 } 382 383 // event_type must be valid 384 if (!JvmtiEventController::is_valid_event_type(event_type)) { 385 return JVMTI_ERROR_INVALID_EVENT_TYPE; 386 } 387 388 // global events cannot be controlled at thread level. 389 if (java_thread != NULL && JvmtiEventController::is_global_event(event_type)) { 390 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 391 } 392 393 bool enabled = (mode == JVMTI_ENABLE); 394 395 // assure that needed capabilities are present 396 if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) { 397 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY; 398 } 399 400 if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) { 401 record_class_file_load_hook_enabled(); 402 } 403 JvmtiEventController::set_user_enabled(this, java_thread, event_type, enabled); 404 405 return JVMTI_ERROR_NONE; 406 } /* end SetEventNotificationMode */ 407 408 // 409 // Capability functions 410 // 411 412 // capabilities_ptr - pre-checked for NULL 413 jvmtiError 414 JvmtiEnv::GetPotentialCapabilities(jvmtiCapabilities* capabilities_ptr) { 415 JvmtiManageCapabilities::get_potential_capabilities(get_capabilities(), 416 get_prohibited_capabilities(), 417 capabilities_ptr); 418 return JVMTI_ERROR_NONE; 419 } /* end GetPotentialCapabilities */ 420 421 422 // capabilities_ptr - pre-checked for NULL 423 jvmtiError 424 JvmtiEnv::AddCapabilities(const jvmtiCapabilities* capabilities_ptr) { 425 return JvmtiManageCapabilities::add_capabilities(get_capabilities(), 426 get_prohibited_capabilities(), 427 capabilities_ptr, 428 get_capabilities()); 429 } /* end AddCapabilities */ 430 431 432 // capabilities_ptr - pre-checked for NULL 433 jvmtiError 434 JvmtiEnv::RelinquishCapabilities(const jvmtiCapabilities* capabilities_ptr) { 435 JvmtiManageCapabilities::relinquish_capabilities(get_capabilities(), capabilities_ptr, get_capabilities()); 436 return JVMTI_ERROR_NONE; 437 } /* end RelinquishCapabilities */ 438 439 440 // capabilities_ptr - pre-checked for NULL 441 jvmtiError 442 JvmtiEnv::GetCapabilities(jvmtiCapabilities* capabilities_ptr) { 443 JvmtiManageCapabilities::copy_capabilities(get_capabilities(), capabilities_ptr); 444 return JVMTI_ERROR_NONE; 445 } /* end GetCapabilities */ 446 447 // 448 // Class Loader Search functions 449 // 450 451 // segment - pre-checked for NULL 452 jvmtiError 453 JvmtiEnv::AddToBootstrapClassLoaderSearch(const char* segment) { 454 jvmtiPhase phase = get_phase(); 455 if (phase == JVMTI_PHASE_ONLOAD) { 456 Arguments::append_sysclasspath(segment); 457 return JVMTI_ERROR_NONE; 458 } else if (use_version_1_0_semantics()) { 459 // This JvmtiEnv requested version 1.0 semantics and this function 460 // is only allowed in the ONLOAD phase in version 1.0 so we need to 461 // return an error here. 462 return JVMTI_ERROR_WRONG_PHASE; 463 } else if (phase == JVMTI_PHASE_LIVE) { 464 // The phase is checked by the wrapper that called this function, 465 // but this thread could be racing with the thread that is 466 // terminating the VM so we check one more time. 467 468 // create the zip entry 469 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment); 470 if (zip_entry == NULL) { 471 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 472 } 473 474 // lock the loader 475 Thread* thread = Thread::current(); 476 HandleMark hm; 477 Handle loader_lock = Handle(thread, SystemDictionary::system_loader_lock()); 478 479 ObjectLocker ol(loader_lock, thread); 480 481 // add the jar file to the bootclasspath 482 if (TraceClassLoading) { 483 tty->print_cr("[Opened %s]", zip_entry->name()); 484 } 485 ClassLoader::add_to_list(zip_entry); 486 return JVMTI_ERROR_NONE; 487 } else { 488 return JVMTI_ERROR_WRONG_PHASE; 489 } 490 491 } /* end AddToBootstrapClassLoaderSearch */ 492 493 494 // segment - pre-checked for NULL 495 jvmtiError 496 JvmtiEnv::AddToSystemClassLoaderSearch(const char* segment) { 497 jvmtiPhase phase = get_phase(); 498 499 if (phase == JVMTI_PHASE_ONLOAD) { 500 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 501 if (strcmp("java.class.path", p->key()) == 0) { 502 p->append_value(segment); 503 break; 504 } 505 } 506 return JVMTI_ERROR_NONE; 507 } else if (phase == JVMTI_PHASE_LIVE) { 508 // The phase is checked by the wrapper that called this function, 509 // but this thread could be racing with the thread that is 510 // terminating the VM so we check one more time. 511 HandleMark hm; 512 513 // create the zip entry (which will open the zip file and hence 514 // check that the segment is indeed a zip file). 515 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment); 516 if (zip_entry == NULL) { 517 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 518 } 519 delete zip_entry; // no longer needed 520 521 // lock the loader 522 Thread* THREAD = Thread::current(); 523 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader()); 524 525 ObjectLocker ol(loader, THREAD); 526 527 // need the path as java.lang.String 528 Handle path = java_lang_String::create_from_str(segment, THREAD); 529 if (HAS_PENDING_EXCEPTION) { 530 CLEAR_PENDING_EXCEPTION; 531 return JVMTI_ERROR_INTERNAL; 532 } 533 534 instanceKlassHandle loader_ik(THREAD, loader->klass()); 535 536 // Invoke the appendToClassPathForInstrumentation method - if the method 537 // is not found it means the loader doesn't support adding to the class path 538 // in the live phase. 539 { 540 JavaValue res(T_VOID); 541 JavaCalls::call_special(&res, 542 loader, 543 loader_ik, 544 vmSymbolHandles::appendToClassPathForInstrumentation_name(), 545 vmSymbolHandles::appendToClassPathForInstrumentation_signature(), 546 path, 547 THREAD); 548 if (HAS_PENDING_EXCEPTION) { 549 symbolOop ex_name = PENDING_EXCEPTION->klass()->klass_part()->name(); 550 CLEAR_PENDING_EXCEPTION; 551 552 if (ex_name == vmSymbols::java_lang_NoSuchMethodError()) { 553 return JVMTI_ERROR_CLASS_LOADER_UNSUPPORTED; 554 } else { 555 return JVMTI_ERROR_INTERNAL; 556 } 557 } 558 } 559 560 return JVMTI_ERROR_NONE; 561 } else { 562 return JVMTI_ERROR_WRONG_PHASE; 563 } 564 } /* end AddToSystemClassLoaderSearch */ 565 566 // 567 // General functions 568 // 569 570 // phase_ptr - pre-checked for NULL 571 jvmtiError 572 JvmtiEnv::GetPhase(jvmtiPhase* phase_ptr) { 573 *phase_ptr = get_phase(); 574 return JVMTI_ERROR_NONE; 575 } /* end GetPhase */ 576 577 578 jvmtiError 579 JvmtiEnv::DisposeEnvironment() { 580 dispose(); 581 return JVMTI_ERROR_NONE; 582 } /* end DisposeEnvironment */ 583 584 585 // data - NULL is a valid value, must be checked 586 jvmtiError 587 JvmtiEnv::SetEnvironmentLocalStorage(const void* data) { 588 set_env_local_storage(data); 589 return JVMTI_ERROR_NONE; 590 } /* end SetEnvironmentLocalStorage */ 591 592 593 // data_ptr - pre-checked for NULL 594 jvmtiError 595 JvmtiEnv::GetEnvironmentLocalStorage(void** data_ptr) { 596 *data_ptr = (void*)get_env_local_storage(); 597 return JVMTI_ERROR_NONE; 598 } /* end GetEnvironmentLocalStorage */ 599 600 // version_ptr - pre-checked for NULL 601 jvmtiError 602 JvmtiEnv::GetVersionNumber(jint* version_ptr) { 603 *version_ptr = JVMTI_VERSION; 604 return JVMTI_ERROR_NONE; 605 } /* end GetVersionNumber */ 606 607 608 // name_ptr - pre-checked for NULL 609 jvmtiError 610 JvmtiEnv::GetErrorName(jvmtiError error, char** name_ptr) { 611 if (error < JVMTI_ERROR_NONE || error > JVMTI_ERROR_MAX) { 612 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 613 } 614 const char *name = JvmtiUtil::error_name(error); 615 if (name == NULL) { 616 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 617 } 618 size_t len = strlen(name) + 1; 619 jvmtiError err = allocate(len, (unsigned char**)name_ptr); 620 if (err == JVMTI_ERROR_NONE) { 621 memcpy(*name_ptr, name, len); 622 } 623 return err; 624 } /* end GetErrorName */ 625 626 627 jvmtiError 628 JvmtiEnv::SetVerboseFlag(jvmtiVerboseFlag flag, jboolean value) { 629 switch (flag) { 630 case JVMTI_VERBOSE_OTHER: 631 // ignore 632 break; 633 case JVMTI_VERBOSE_CLASS: 634 TraceClassLoading = value != 0; 635 TraceClassUnloading = value != 0; 636 break; 637 case JVMTI_VERBOSE_GC: 638 PrintGC = value != 0; 639 break; 640 case JVMTI_VERBOSE_JNI: 641 PrintJNIResolving = value != 0; 642 break; 643 default: 644 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 645 }; 646 return JVMTI_ERROR_NONE; 647 } /* end SetVerboseFlag */ 648 649 650 // format_ptr - pre-checked for NULL 651 jvmtiError 652 JvmtiEnv::GetJLocationFormat(jvmtiJlocationFormat* format_ptr) { 653 *format_ptr = JVMTI_JLOCATION_JVMBCI; 654 return JVMTI_ERROR_NONE; 655 } /* end GetJLocationFormat */ 656 657 #ifndef JVMTI_KERNEL 658 659 // 660 // Thread functions 661 // 662 663 // Threads_lock NOT held 664 // thread - NOT pre-checked 665 // thread_state_ptr - pre-checked for NULL 666 jvmtiError 667 JvmtiEnv::GetThreadState(jthread thread, jint* thread_state_ptr) { 668 jint state; 669 oop thread_oop; 670 JavaThread* thr; 671 672 if (thread == NULL) { 673 thread_oop = JavaThread::current()->threadObj(); 674 } else { 675 thread_oop = JNIHandles::resolve_external_guard(thread); 676 } 677 678 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) { 679 return JVMTI_ERROR_INVALID_THREAD; 680 } 681 682 // get most state bits 683 state = (jint)java_lang_Thread::get_thread_status(thread_oop); 684 685 // add more state bits 686 thr = java_lang_Thread::thread(thread_oop); 687 if (thr != NULL) { 688 JavaThreadState jts = thr->thread_state(); 689 690 if (thr->is_being_ext_suspended()) { 691 state |= JVMTI_THREAD_STATE_SUSPENDED; 692 } 693 if (jts == _thread_in_native) { 694 state |= JVMTI_THREAD_STATE_IN_NATIVE; 695 } 696 OSThread* osThread = thr->osthread(); 697 if (osThread != NULL && osThread->interrupted()) { 698 state |= JVMTI_THREAD_STATE_INTERRUPTED; 699 } 700 } 701 702 *thread_state_ptr = state; 703 return JVMTI_ERROR_NONE; 704 } /* end GetThreadState */ 705 706 707 // thread_ptr - pre-checked for NULL 708 jvmtiError 709 JvmtiEnv::GetCurrentThread(jthread* thread_ptr) { 710 JavaThread* current_thread = JavaThread::current(); 711 *thread_ptr = (jthread)JNIHandles::make_local(current_thread, current_thread->threadObj()); 712 return JVMTI_ERROR_NONE; 713 } /* end GetCurrentThread */ 714 715 716 // threads_count_ptr - pre-checked for NULL 717 // threads_ptr - pre-checked for NULL 718 jvmtiError 719 JvmtiEnv::GetAllThreads(jint* threads_count_ptr, jthread** threads_ptr) { 720 int nthreads = 0; 721 Handle *thread_objs = NULL; 722 ResourceMark rm; 723 HandleMark hm; 724 725 // enumerate threads (including agent threads) 726 ThreadsListEnumerator tle(Thread::current(), true); 727 nthreads = tle.num_threads(); 728 *threads_count_ptr = nthreads; 729 730 if (nthreads == 0) { 731 *threads_ptr = NULL; 732 return JVMTI_ERROR_NONE; 733 } 734 735 thread_objs = NEW_RESOURCE_ARRAY(Handle, nthreads); 736 NULL_CHECK(thread_objs, JVMTI_ERROR_OUT_OF_MEMORY); 737 738 for (int i=0; i < nthreads; i++) { 739 thread_objs[i] = Handle(tle.get_threadObj(i)); 740 } 741 742 // have to make global handles outside of Threads_lock 743 jthread *jthreads = new_jthreadArray(nthreads, thread_objs); 744 NULL_CHECK(jthreads, JVMTI_ERROR_OUT_OF_MEMORY); 745 746 *threads_ptr = jthreads; 747 return JVMTI_ERROR_NONE; 748 } /* end GetAllThreads */ 749 750 751 // Threads_lock NOT held, java_thread not protected by lock 752 // java_thread - pre-checked 753 jvmtiError 754 JvmtiEnv::SuspendThread(JavaThread* java_thread) { 755 // don't allow hidden thread suspend request. 756 if (java_thread->is_hidden_from_external_view()) { 757 return (JVMTI_ERROR_NONE); 758 } 759 760 { 761 MutexLockerEx ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag); 762 if (java_thread->is_external_suspend()) { 763 // don't allow nested external suspend requests. 764 return (JVMTI_ERROR_THREAD_SUSPENDED); 765 } 766 if (java_thread->is_exiting()) { // thread is in the process of exiting 767 return (JVMTI_ERROR_THREAD_NOT_ALIVE); 768 } 769 java_thread->set_external_suspend(); 770 } 771 772 if (!JvmtiSuspendControl::suspend(java_thread)) { 773 // the thread was in the process of exiting 774 return (JVMTI_ERROR_THREAD_NOT_ALIVE); 775 } 776 return JVMTI_ERROR_NONE; 777 } /* end SuspendThread */ 778 779 780 // request_count - pre-checked to be greater than or equal to 0 781 // request_list - pre-checked for NULL 782 // results - pre-checked for NULL 783 jvmtiError 784 JvmtiEnv::SuspendThreadList(jint request_count, const jthread* request_list, jvmtiError* results) { 785 int needSafepoint = 0; // > 0 if we need a safepoint 786 for (int i = 0; i < request_count; i++) { 787 JavaThread *java_thread = get_JavaThread(request_list[i]); 788 if (java_thread == NULL) { 789 results[i] = JVMTI_ERROR_INVALID_THREAD; 790 continue; 791 } 792 // the thread has not yet run or has exited (not on threads list) 793 if (java_thread->threadObj() == NULL) { 794 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE; 795 continue; 796 } 797 if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) { 798 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE; 799 continue; 800 } 801 // don't allow hidden thread suspend request. 802 if (java_thread->is_hidden_from_external_view()) { 803 results[i] = JVMTI_ERROR_NONE; // indicate successful suspend 804 continue; 805 } 806 807 { 808 MutexLockerEx ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag); 809 if (java_thread->is_external_suspend()) { 810 // don't allow nested external suspend requests. 811 results[i] = JVMTI_ERROR_THREAD_SUSPENDED; 812 continue; 813 } 814 if (java_thread->is_exiting()) { // thread is in the process of exiting 815 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE; 816 continue; 817 } 818 java_thread->set_external_suspend(); 819 } 820 if (java_thread->thread_state() == _thread_in_native) { 821 // We need to try and suspend native threads here. Threads in 822 // other states will self-suspend on their next transition. 823 if (!JvmtiSuspendControl::suspend(java_thread)) { 824 // The thread was in the process of exiting. Force another 825 // safepoint to make sure that this thread transitions. 826 needSafepoint++; 827 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE; 828 continue; 829 } 830 } else { 831 needSafepoint++; 832 } 833 results[i] = JVMTI_ERROR_NONE; // indicate successful suspend 834 } 835 if (needSafepoint > 0) { 836 VM_ForceSafepoint vfs; 837 VMThread::execute(&vfs); 838 } 839 // per-thread suspend results returned via results parameter 840 return JVMTI_ERROR_NONE; 841 } /* end SuspendThreadList */ 842 843 844 // Threads_lock NOT held, java_thread not protected by lock 845 // java_thread - pre-checked 846 jvmtiError 847 JvmtiEnv::ResumeThread(JavaThread* java_thread) { 848 // don't allow hidden thread resume request. 849 if (java_thread->is_hidden_from_external_view()) { 850 return JVMTI_ERROR_NONE; 851 } 852 853 if (!java_thread->is_being_ext_suspended()) { 854 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; 855 } 856 857 if (!JvmtiSuspendControl::resume(java_thread)) { 858 return JVMTI_ERROR_INTERNAL; 859 } 860 return JVMTI_ERROR_NONE; 861 } /* end ResumeThread */ 862 863 864 // request_count - pre-checked to be greater than or equal to 0 865 // request_list - pre-checked for NULL 866 // results - pre-checked for NULL 867 jvmtiError 868 JvmtiEnv::ResumeThreadList(jint request_count, const jthread* request_list, jvmtiError* results) { 869 for (int i = 0; i < request_count; i++) { 870 JavaThread *java_thread = get_JavaThread(request_list[i]); 871 if (java_thread == NULL) { 872 results[i] = JVMTI_ERROR_INVALID_THREAD; 873 continue; 874 } 875 // don't allow hidden thread resume request. 876 if (java_thread->is_hidden_from_external_view()) { 877 results[i] = JVMTI_ERROR_NONE; // indicate successful resume 878 continue; 879 } 880 if (!java_thread->is_being_ext_suspended()) { 881 results[i] = JVMTI_ERROR_THREAD_NOT_SUSPENDED; 882 continue; 883 } 884 885 if (!JvmtiSuspendControl::resume(java_thread)) { 886 results[i] = JVMTI_ERROR_INTERNAL; 887 continue; 888 } 889 890 results[i] = JVMTI_ERROR_NONE; // indicate successful suspend 891 } 892 // per-thread resume results returned via results parameter 893 return JVMTI_ERROR_NONE; 894 } /* end ResumeThreadList */ 895 896 897 // Threads_lock NOT held, java_thread not protected by lock 898 // java_thread - pre-checked 899 jvmtiError 900 JvmtiEnv::StopThread(JavaThread* java_thread, jobject exception) { 901 oop e = JNIHandles::resolve_external_guard(exception); 902 NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER); 903 904 JavaThread::send_async_exception(java_thread->threadObj(), e); 905 906 return JVMTI_ERROR_NONE; 907 908 } /* end StopThread */ 909 910 911 // Threads_lock NOT held 912 // thread - NOT pre-checked 913 jvmtiError 914 JvmtiEnv::InterruptThread(jthread thread) { 915 oop thread_oop = JNIHandles::resolve_external_guard(thread); 916 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) 917 return JVMTI_ERROR_INVALID_THREAD; 918 919 JavaThread* current_thread = JavaThread::current(); 920 921 // Todo: this is a duplicate of JVM_Interrupt; share code in future 922 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 923 MutexLockerEx ml(current_thread->threadObj() == thread_oop ? NULL : Threads_lock); 924 // We need to re-resolve the java_thread, since a GC might have happened during the 925 // acquire of the lock 926 927 JavaThread* java_thread = java_lang_Thread::thread(JNIHandles::resolve_external_guard(thread)); 928 NULL_CHECK(java_thread, JVMTI_ERROR_THREAD_NOT_ALIVE); 929 930 Thread::interrupt(java_thread); 931 932 return JVMTI_ERROR_NONE; 933 } /* end InterruptThread */ 934 935 936 // Threads_lock NOT held 937 // thread - NOT pre-checked 938 // info_ptr - pre-checked for NULL 939 jvmtiError 940 JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) { 941 ResourceMark rm; 942 HandleMark hm; 943 944 JavaThread* current_thread = JavaThread::current(); 945 946 // if thread is NULL the current thread is used 947 oop thread_oop; 948 if (thread == NULL) { 949 thread_oop = current_thread->threadObj(); 950 } else { 951 thread_oop = JNIHandles::resolve_external_guard(thread); 952 } 953 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) 954 return JVMTI_ERROR_INVALID_THREAD; 955 956 Handle thread_obj(current_thread, thread_oop); 957 typeArrayHandle name; 958 ThreadPriority priority; 959 Handle thread_group; 960 Handle context_class_loader; 961 bool is_daemon; 962 963 { MutexLocker mu(Threads_lock); 964 965 name = typeArrayHandle(current_thread, java_lang_Thread::name(thread_obj())); 966 priority = java_lang_Thread::priority(thread_obj()); 967 thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj())); 968 is_daemon = java_lang_Thread::is_daemon(thread_obj()); 969 970 oop loader = java_lang_Thread::context_class_loader(thread_obj()); 971 context_class_loader = Handle(current_thread, loader); 972 } 973 { const char *n; 974 975 if (name() != NULL) { 976 n = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); 977 } else { 978 n = UNICODE::as_utf8(NULL, 0); 979 } 980 981 info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1); 982 if (info_ptr->name == NULL) 983 return JVMTI_ERROR_OUT_OF_MEMORY; 984 985 strcpy(info_ptr->name, n); 986 } 987 info_ptr->is_daemon = is_daemon; 988 info_ptr->priority = priority; 989 990 info_ptr->context_class_loader = (context_class_loader.is_null()) ? NULL : 991 jni_reference(context_class_loader); 992 info_ptr->thread_group = jni_reference(thread_group); 993 994 return JVMTI_ERROR_NONE; 995 } /* end GetThreadInfo */ 996 997 998 // Threads_lock NOT held, java_thread not protected by lock 999 // java_thread - pre-checked 1000 // owned_monitor_count_ptr - pre-checked for NULL 1001 // owned_monitors_ptr - pre-checked for NULL 1002 jvmtiError 1003 JvmtiEnv::GetOwnedMonitorInfo(JavaThread* java_thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) { 1004 jvmtiError err = JVMTI_ERROR_NONE; 1005 JavaThread* calling_thread = JavaThread::current(); 1006 1007 // growable array of jvmti monitors info on the C-heap 1008 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list = 1009 new (ResourceObj::C_HEAP) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, true); 1010 1011 uint32_t debug_bits = 0; 1012 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) { 1013 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list); 1014 } else { 1015 // JVMTI get monitors info at safepoint. Do not require target thread to 1016 // be suspended. 1017 VM_GetOwnedMonitorInfo op(this, calling_thread, java_thread, owned_monitors_list); 1018 VMThread::execute(&op); 1019 err = op.result(); 1020 } 1021 jint owned_monitor_count = owned_monitors_list->length(); 1022 if (err == JVMTI_ERROR_NONE) { 1023 if ((err = allocate(owned_monitor_count * sizeof(jobject *), 1024 (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) { 1025 // copy into the returned array 1026 for (int i = 0; i < owned_monitor_count; i++) { 1027 (*owned_monitors_ptr)[i] = 1028 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor; 1029 } 1030 *owned_monitor_count_ptr = owned_monitor_count; 1031 } 1032 } 1033 // clean up. 1034 for (int i = 0; i < owned_monitor_count; i++) { 1035 deallocate((unsigned char*)owned_monitors_list->at(i)); 1036 } 1037 delete owned_monitors_list; 1038 1039 return err; 1040 } /* end GetOwnedMonitorInfo */ 1041 1042 1043 // Threads_lock NOT held, java_thread not protected by lock 1044 // java_thread - pre-checked 1045 // monitor_info_count_ptr - pre-checked for NULL 1046 // monitor_info_ptr - pre-checked for NULL 1047 jvmtiError 1048 JvmtiEnv::GetOwnedMonitorStackDepthInfo(JavaThread* java_thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) { 1049 jvmtiError err = JVMTI_ERROR_NONE; 1050 JavaThread* calling_thread = JavaThread::current(); 1051 1052 // growable array of jvmti monitors info on the C-heap 1053 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list = 1054 new (ResourceObj::C_HEAP) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, true); 1055 1056 uint32_t debug_bits = 0; 1057 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) { 1058 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list); 1059 } else { 1060 // JVMTI get owned monitors info at safepoint. Do not require target thread to 1061 // be suspended. 1062 VM_GetOwnedMonitorInfo op(this, calling_thread, java_thread, owned_monitors_list); 1063 VMThread::execute(&op); 1064 err = op.result(); 1065 } 1066 1067 jint owned_monitor_count = owned_monitors_list->length(); 1068 if (err == JVMTI_ERROR_NONE) { 1069 if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo), 1070 (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) { 1071 // copy to output array. 1072 for (int i = 0; i < owned_monitor_count; i++) { 1073 (*monitor_info_ptr)[i].monitor = 1074 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor; 1075 (*monitor_info_ptr)[i].stack_depth = 1076 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth; 1077 } 1078 } 1079 *monitor_info_count_ptr = owned_monitor_count; 1080 } 1081 1082 // clean up. 1083 for (int i = 0; i < owned_monitor_count; i++) { 1084 deallocate((unsigned char*)owned_monitors_list->at(i)); 1085 } 1086 delete owned_monitors_list; 1087 1088 return err; 1089 } /* end GetOwnedMonitorStackDepthInfo */ 1090 1091 1092 // Threads_lock NOT held, java_thread not protected by lock 1093 // java_thread - pre-checked 1094 // monitor_ptr - pre-checked for NULL 1095 jvmtiError 1096 JvmtiEnv::GetCurrentContendedMonitor(JavaThread* java_thread, jobject* monitor_ptr) { 1097 jvmtiError err = JVMTI_ERROR_NONE; 1098 uint32_t debug_bits = 0; 1099 JavaThread* calling_thread = JavaThread::current(); 1100 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) { 1101 err = get_current_contended_monitor(calling_thread, java_thread, monitor_ptr); 1102 } else { 1103 // get contended monitor information at safepoint. 1104 VM_GetCurrentContendedMonitor op(this, calling_thread, java_thread, monitor_ptr); 1105 VMThread::execute(&op); 1106 err = op.result(); 1107 } 1108 return err; 1109 } /* end GetCurrentContendedMonitor */ 1110 1111 1112 // Threads_lock NOT held 1113 // thread - NOT pre-checked 1114 // proc - pre-checked for NULL 1115 // arg - NULL is a valid value, must be checked 1116 jvmtiError 1117 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) { 1118 oop thread_oop = JNIHandles::resolve_external_guard(thread); 1119 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) { 1120 return JVMTI_ERROR_INVALID_THREAD; 1121 } 1122 if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) { 1123 return JVMTI_ERROR_INVALID_PRIORITY; 1124 } 1125 1126 //Thread-self 1127 JavaThread* current_thread = JavaThread::current(); 1128 1129 Handle thread_hndl(current_thread, thread_oop); 1130 { 1131 MutexLocker mu(Threads_lock); // grab Threads_lock 1132 1133 JvmtiAgentThread *new_thread = new JvmtiAgentThread(this, proc, arg); 1134 1135 // At this point it may be possible that no osthread was created for the 1136 // JavaThread due to lack of memory. 1137 if (new_thread == NULL || new_thread->osthread() == NULL) { 1138 if (new_thread) delete new_thread; 1139 return JVMTI_ERROR_OUT_OF_MEMORY; 1140 } 1141 1142 java_lang_Thread::set_thread(thread_hndl(), new_thread); 1143 java_lang_Thread::set_priority(thread_hndl(), (ThreadPriority)priority); 1144 java_lang_Thread::set_daemon(thread_hndl()); 1145 1146 new_thread->set_threadObj(thread_hndl()); 1147 Threads::add(new_thread); 1148 Thread::start(new_thread); 1149 } // unlock Threads_lock 1150 1151 return JVMTI_ERROR_NONE; 1152 } /* end RunAgentThread */ 1153 1154 // 1155 // Thread Group functions 1156 // 1157 1158 // group_count_ptr - pre-checked for NULL 1159 // groups_ptr - pre-checked for NULL 1160 jvmtiError 1161 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) { 1162 JavaThread* current_thread = JavaThread::current(); 1163 1164 // Only one top level thread group now. 1165 *group_count_ptr = 1; 1166 1167 // Allocate memory to store global-refs to the thread groups. 1168 // Assume this area is freed by caller. 1169 *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr)); 1170 1171 NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY); 1172 1173 // Convert oop to Handle, then convert Handle to global-ref. 1174 { 1175 HandleMark hm(current_thread); 1176 Handle system_thread_group(current_thread, Universe::system_thread_group()); 1177 *groups_ptr[0] = jni_reference(system_thread_group); 1178 } 1179 1180 return JVMTI_ERROR_NONE; 1181 } /* end GetTopThreadGroups */ 1182 1183 1184 // info_ptr - pre-checked for NULL 1185 jvmtiError 1186 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) { 1187 ResourceMark rm; 1188 HandleMark hm; 1189 1190 JavaThread* current_thread = JavaThread::current(); 1191 1192 Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group)); 1193 NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP); 1194 1195 typeArrayHandle name; 1196 Handle parent_group; 1197 bool is_daemon; 1198 ThreadPriority max_priority; 1199 1200 { MutexLocker mu(Threads_lock); 1201 1202 name = typeArrayHandle(current_thread, 1203 java_lang_ThreadGroup::name(group_obj())); 1204 parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj())); 1205 is_daemon = java_lang_ThreadGroup::is_daemon(group_obj()); 1206 max_priority = java_lang_ThreadGroup::maxPriority(group_obj()); 1207 } 1208 1209 info_ptr->is_daemon = is_daemon; 1210 info_ptr->max_priority = max_priority; 1211 info_ptr->parent = jni_reference(parent_group); 1212 1213 if (name() != NULL) { 1214 const char* n = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); 1215 info_ptr->name = (char *)jvmtiMalloc(strlen(n)+1); 1216 NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY); 1217 strcpy(info_ptr->name, n); 1218 } else { 1219 info_ptr->name = NULL; 1220 } 1221 1222 return JVMTI_ERROR_NONE; 1223 } /* end GetThreadGroupInfo */ 1224 1225 1226 // thread_count_ptr - pre-checked for NULL 1227 // threads_ptr - pre-checked for NULL 1228 // group_count_ptr - pre-checked for NULL 1229 // groups_ptr - pre-checked for NULL 1230 jvmtiError 1231 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) { 1232 JavaThread* current_thread = JavaThread::current(); 1233 oop group_obj = (oop) JNIHandles::resolve_external_guard(group); 1234 NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP); 1235 1236 Handle *thread_objs = NULL; 1237 Handle *group_objs = NULL; 1238 int nthreads = 0; 1239 int ngroups = 0; 1240 int hidden_threads = 0; 1241 1242 ResourceMark rm; 1243 HandleMark hm; 1244 1245 Handle group_hdl(current_thread, group_obj); 1246 1247 { MutexLocker mu(Threads_lock); 1248 1249 nthreads = java_lang_ThreadGroup::nthreads(group_hdl()); 1250 ngroups = java_lang_ThreadGroup::ngroups(group_hdl()); 1251 1252 if (nthreads > 0) { 1253 objArrayOop threads = java_lang_ThreadGroup::threads(group_hdl()); 1254 assert(nthreads <= threads->length(), "too many threads"); 1255 thread_objs = NEW_RESOURCE_ARRAY(Handle,nthreads); 1256 for (int i=0, j=0; i<nthreads; i++) { 1257 oop thread_obj = threads->obj_at(i); 1258 assert(thread_obj != NULL, "thread_obj is NULL"); 1259 JavaThread *javathread = java_lang_Thread::thread(thread_obj); 1260 // Filter out hidden java threads. 1261 if (javathread != NULL && javathread->is_hidden_from_external_view()) { 1262 hidden_threads++; 1263 continue; 1264 } 1265 thread_objs[j++] = Handle(current_thread, thread_obj); 1266 } 1267 nthreads -= hidden_threads; 1268 } 1269 if (ngroups > 0) { 1270 objArrayOop groups = java_lang_ThreadGroup::groups(group_hdl()); 1271 assert(ngroups <= groups->length(), "too many threads"); 1272 group_objs = NEW_RESOURCE_ARRAY(Handle,ngroups); 1273 for (int i=0; i<ngroups; i++) { 1274 oop group_obj = groups->obj_at(i); 1275 assert(group_obj != NULL, "group_obj != NULL"); 1276 group_objs[i] = Handle(current_thread, group_obj); 1277 } 1278 } 1279 } 1280 1281 // have to make global handles outside of Threads_lock 1282 *group_count_ptr = ngroups; 1283 *thread_count_ptr = nthreads; 1284 *threads_ptr = new_jthreadArray(nthreads, thread_objs); 1285 *groups_ptr = new_jthreadGroupArray(ngroups, group_objs); 1286 if ((nthreads > 0) && (*threads_ptr == NULL)) { 1287 return JVMTI_ERROR_OUT_OF_MEMORY; 1288 } 1289 if ((ngroups > 0) && (*groups_ptr == NULL)) { 1290 return JVMTI_ERROR_OUT_OF_MEMORY; 1291 } 1292 1293 return JVMTI_ERROR_NONE; 1294 } /* end GetThreadGroupChildren */ 1295 1296 1297 // 1298 // Stack Frame functions 1299 // 1300 1301 // Threads_lock NOT held, java_thread not protected by lock 1302 // java_thread - pre-checked 1303 // max_frame_count - pre-checked to be greater than or equal to 0 1304 // frame_buffer - pre-checked for NULL 1305 // count_ptr - pre-checked for NULL 1306 jvmtiError 1307 JvmtiEnv::GetStackTrace(JavaThread* java_thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) { 1308 jvmtiError err = JVMTI_ERROR_NONE; 1309 uint32_t debug_bits = 0; 1310 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) { 1311 err = get_stack_trace(java_thread, start_depth, max_frame_count, frame_buffer, count_ptr); 1312 } else { 1313 // JVMTI get stack trace at safepoint. Do not require target thread to 1314 // be suspended. 1315 VM_GetStackTrace op(this, java_thread, start_depth, max_frame_count, frame_buffer, count_ptr); 1316 VMThread::execute(&op); 1317 err = op.result(); 1318 } 1319 1320 return err; 1321 } /* end GetStackTrace */ 1322 1323 1324 // max_frame_count - pre-checked to be greater than or equal to 0 1325 // stack_info_ptr - pre-checked for NULL 1326 // thread_count_ptr - pre-checked for NULL 1327 jvmtiError 1328 JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) { 1329 jvmtiError err = JVMTI_ERROR_NONE; 1330 JavaThread* calling_thread = JavaThread::current(); 1331 1332 // JVMTI get stack traces at safepoint. 1333 VM_GetAllStackTraces op(this, calling_thread, max_frame_count); 1334 VMThread::execute(&op); 1335 *thread_count_ptr = op.final_thread_count(); 1336 *stack_info_ptr = op.stack_info(); 1337 err = op.result(); 1338 return err; 1339 } /* end GetAllStackTraces */ 1340 1341 1342 // thread_count - pre-checked to be greater than or equal to 0 1343 // thread_list - pre-checked for NULL 1344 // max_frame_count - pre-checked to be greater than or equal to 0 1345 // stack_info_ptr - pre-checked for NULL 1346 jvmtiError 1347 JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) { 1348 jvmtiError err = JVMTI_ERROR_NONE; 1349 // JVMTI get stack traces at safepoint. 1350 VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count); 1351 VMThread::execute(&op); 1352 err = op.result(); 1353 if (err == JVMTI_ERROR_NONE) { 1354 *stack_info_ptr = op.stack_info(); 1355 } 1356 return err; 1357 } /* end GetThreadListStackTraces */ 1358 1359 1360 // Threads_lock NOT held, java_thread not protected by lock 1361 // java_thread - pre-checked 1362 // count_ptr - pre-checked for NULL 1363 jvmtiError 1364 JvmtiEnv::GetFrameCount(JavaThread* java_thread, jint* count_ptr) { 1365 jvmtiError err = JVMTI_ERROR_NONE; 1366 1367 // retrieve or create JvmtiThreadState. 1368 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread); 1369 if (state == NULL) { 1370 return JVMTI_ERROR_THREAD_NOT_ALIVE; 1371 } 1372 uint32_t debug_bits = 0; 1373 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) { 1374 err = get_frame_count(state, count_ptr); 1375 } else { 1376 // get java stack frame count at safepoint. 1377 VM_GetFrameCount op(this, state, count_ptr); 1378 VMThread::execute(&op); 1379 err = op.result(); 1380 } 1381 return err; 1382 } /* end GetFrameCount */ 1383 1384 1385 // Threads_lock NOT held, java_thread not protected by lock 1386 // java_thread - pre-checked 1387 jvmtiError 1388 JvmtiEnv::PopFrame(JavaThread* java_thread) { 1389 JavaThread* current_thread = JavaThread::current(); 1390 HandleMark hm(current_thread); 1391 uint32_t debug_bits = 0; 1392 1393 // retrieve or create the state 1394 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread); 1395 if (state == NULL) { 1396 return JVMTI_ERROR_THREAD_NOT_ALIVE; 1397 } 1398 1399 // Check if java_thread is fully suspended 1400 if (!is_thread_fully_suspended(java_thread, true /* wait for suspend completion */, &debug_bits)) { 1401 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; 1402 } 1403 // Check to see if a PopFrame was already in progress 1404 if (java_thread->popframe_condition() != JavaThread::popframe_inactive) { 1405 // Probably possible for JVMTI clients to trigger this, but the 1406 // JPDA backend shouldn't allow this to happen 1407 return JVMTI_ERROR_INTERNAL; 1408 } 1409 1410 { 1411 // Was workaround bug 1412 // 4812902: popFrame hangs if the method is waiting at a synchronize 1413 // Catch this condition and return an error to avoid hanging. 1414 // Now JVMTI spec allows an implementation to bail out with an opaque frame error. 1415 OSThread* osThread = java_thread->osthread(); 1416 if (osThread->get_state() == MONITOR_WAIT) { 1417 return JVMTI_ERROR_OPAQUE_FRAME; 1418 } 1419 } 1420 1421 { 1422 ResourceMark rm(current_thread); 1423 // Check if there are more than one Java frame in this thread, that the top two frames 1424 // are Java (not native) frames, and that there is no intervening VM frame 1425 int frame_count = 0; 1426 bool is_interpreted[2]; 1427 intptr_t *frame_sp[2]; 1428 // The 2-nd arg of constructor is needed to stop iterating at java entry frame. 1429 for (vframeStream vfs(java_thread, true); !vfs.at_end(); vfs.next()) { 1430 methodHandle mh(current_thread, vfs.method()); 1431 if (mh->is_native()) return(JVMTI_ERROR_OPAQUE_FRAME); 1432 is_interpreted[frame_count] = vfs.is_interpreted_frame(); 1433 frame_sp[frame_count] = vfs.frame_id(); 1434 if (++frame_count > 1) break; 1435 } 1436 if (frame_count < 2) { 1437 // We haven't found two adjacent non-native Java frames on the top. 1438 // There can be two situations here: 1439 // 1. There are no more java frames 1440 // 2. Two top java frames are separated by non-java native frames 1441 if(vframeFor(java_thread, 1) == NULL) { 1442 return JVMTI_ERROR_NO_MORE_FRAMES; 1443 } else { 1444 // Intervening non-java native or VM frames separate java frames. 1445 // Current implementation does not support this. See bug #5031735. 1446 // In theory it is possible to pop frames in such cases. 1447 return JVMTI_ERROR_OPAQUE_FRAME; 1448 } 1449 } 1450 1451 // If any of the top 2 frames is a compiled one, need to deoptimize it 1452 for (int i = 0; i < 2; i++) { 1453 if (!is_interpreted[i]) { 1454 VM_DeoptimizeFrame op(java_thread, frame_sp[i]); 1455 VMThread::execute(&op); 1456 } 1457 } 1458 1459 // Update the thread state to reflect that the top frame is popped 1460 // so that cur_stack_depth is maintained properly and all frameIDs 1461 // are invalidated. 1462 // The current frame will be popped later when the suspended thread 1463 // is resumed and right before returning from VM to Java. 1464 // (see call_VM_base() in assembler_<cpu>.cpp). 1465 1466 // It's fine to update the thread state here because no JVMTI events 1467 // shall be posted for this PopFrame. 1468 1469 state->update_for_pop_top_frame(); 1470 java_thread->set_popframe_condition(JavaThread::popframe_pending_bit); 1471 // Set pending step flag for this popframe and it is cleared when next 1472 // step event is posted. 1473 state->set_pending_step_for_popframe(); 1474 } 1475 1476 return JVMTI_ERROR_NONE; 1477 } /* end PopFrame */ 1478 1479 1480 // Threads_lock NOT held, java_thread not protected by lock 1481 // java_thread - pre-checked 1482 // java_thread - unchecked 1483 // depth - pre-checked as non-negative 1484 // method_ptr - pre-checked for NULL 1485 // location_ptr - pre-checked for NULL 1486 jvmtiError 1487 JvmtiEnv::GetFrameLocation(JavaThread* java_thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) { 1488 jvmtiError err = JVMTI_ERROR_NONE; 1489 uint32_t debug_bits = 0; 1490 1491 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) { 1492 err = get_frame_location(java_thread, depth, method_ptr, location_ptr); 1493 } else { 1494 // JVMTI get java stack frame location at safepoint. 1495 VM_GetFrameLocation op(this, java_thread, depth, method_ptr, location_ptr); 1496 VMThread::execute(&op); 1497 err = op.result(); 1498 } 1499 return err; 1500 } /* end GetFrameLocation */ 1501 1502 1503 // Threads_lock NOT held, java_thread not protected by lock 1504 // java_thread - pre-checked 1505 // java_thread - unchecked 1506 // depth - pre-checked as non-negative 1507 jvmtiError 1508 JvmtiEnv::NotifyFramePop(JavaThread* java_thread, jint depth) { 1509 ResourceMark rm; 1510 uint32_t debug_bits = 0; 1511 1512 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread); 1513 if (state == NULL) { 1514 return JVMTI_ERROR_THREAD_NOT_ALIVE; 1515 } 1516 1517 if (!JvmtiEnv::is_thread_fully_suspended(java_thread, true, &debug_bits)) { 1518 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; 1519 } 1520 1521 if (TraceJVMTICalls) { 1522 JvmtiSuspendControl::print(); 1523 } 1524 1525 vframe *vf = vframeFor(java_thread, depth); 1526 if (vf == NULL) { 1527 return JVMTI_ERROR_NO_MORE_FRAMES; 1528 } 1529 1530 if (!vf->is_java_frame() || ((javaVFrame*) vf)->method()->is_native()) { 1531 return JVMTI_ERROR_OPAQUE_FRAME; 1532 } 1533 1534 assert(vf->frame_pointer() != NULL, "frame pointer mustn't be NULL"); 1535 1536 int frame_number = state->count_frames() - depth; 1537 state->env_thread_state(this)->set_frame_pop(frame_number); 1538 1539 return JVMTI_ERROR_NONE; 1540 } /* end NotifyFramePop */ 1541 1542 1543 // 1544 // Force Early Return functions 1545 // 1546 1547 // Threads_lock NOT held, java_thread not protected by lock 1548 // java_thread - pre-checked 1549 jvmtiError 1550 JvmtiEnv::ForceEarlyReturnObject(JavaThread* java_thread, jobject value) { 1551 jvalue val; 1552 val.l = value; 1553 return force_early_return(java_thread, val, atos); 1554 } /* end ForceEarlyReturnObject */ 1555 1556 1557 // Threads_lock NOT held, java_thread not protected by lock 1558 // java_thread - pre-checked 1559 jvmtiError 1560 JvmtiEnv::ForceEarlyReturnInt(JavaThread* java_thread, jint value) { 1561 jvalue val; 1562 val.i = value; 1563 return force_early_return(java_thread, val, itos); 1564 } /* end ForceEarlyReturnInt */ 1565 1566 1567 // Threads_lock NOT held, java_thread not protected by lock 1568 // java_thread - pre-checked 1569 jvmtiError 1570 JvmtiEnv::ForceEarlyReturnLong(JavaThread* java_thread, jlong value) { 1571 jvalue val; 1572 val.j = value; 1573 return force_early_return(java_thread, val, ltos); 1574 } /* end ForceEarlyReturnLong */ 1575 1576 1577 // Threads_lock NOT held, java_thread not protected by lock 1578 // java_thread - pre-checked 1579 jvmtiError 1580 JvmtiEnv::ForceEarlyReturnFloat(JavaThread* java_thread, jfloat value) { 1581 jvalue val; 1582 val.f = value; 1583 return force_early_return(java_thread, val, ftos); 1584 } /* end ForceEarlyReturnFloat */ 1585 1586 1587 // Threads_lock NOT held, java_thread not protected by lock 1588 // java_thread - pre-checked 1589 jvmtiError 1590 JvmtiEnv::ForceEarlyReturnDouble(JavaThread* java_thread, jdouble value) { 1591 jvalue val; 1592 val.d = value; 1593 return force_early_return(java_thread, val, dtos); 1594 } /* end ForceEarlyReturnDouble */ 1595 1596 1597 // Threads_lock NOT held, java_thread not protected by lock 1598 // java_thread - pre-checked 1599 jvmtiError 1600 JvmtiEnv::ForceEarlyReturnVoid(JavaThread* java_thread) { 1601 jvalue val; 1602 val.j = 0L; 1603 return force_early_return(java_thread, val, vtos); 1604 } /* end ForceEarlyReturnVoid */ 1605 1606 1607 // 1608 // Heap functions 1609 // 1610 1611 // klass - NULL is a valid value, must be checked 1612 // initial_object - NULL is a valid value, must be checked 1613 // callbacks - pre-checked for NULL 1614 // user_data - NULL is a valid value, must be checked 1615 jvmtiError 1616 JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) { 1617 // check klass if provided 1618 klassOop k_oop = NULL; 1619 if (klass != NULL) { 1620 oop k_mirror = JNIHandles::resolve_external_guard(klass); 1621 if (k_mirror == NULL) { 1622 return JVMTI_ERROR_INVALID_CLASS; 1623 } 1624 if (java_lang_Class::is_primitive(k_mirror)) { 1625 return JVMTI_ERROR_NONE; 1626 } 1627 k_oop = java_lang_Class::as_klassOop(k_mirror); 1628 if (k_oop == NULL) { 1629 return JVMTI_ERROR_INVALID_CLASS; 1630 } 1631 } 1632 1633 Thread *thread = Thread::current(); 1634 HandleMark hm(thread); 1635 KlassHandle kh (thread, k_oop); 1636 1637 TraceTime t("FollowReferences", TraceJVMTIObjectTagging); 1638 JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, kh, initial_object, callbacks, user_data); 1639 return JVMTI_ERROR_NONE; 1640 } /* end FollowReferences */ 1641 1642 1643 // klass - NULL is a valid value, must be checked 1644 // callbacks - pre-checked for NULL 1645 // user_data - NULL is a valid value, must be checked 1646 jvmtiError 1647 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) { 1648 // check klass if provided 1649 klassOop k_oop = NULL; 1650 if (klass != NULL) { 1651 oop k_mirror = JNIHandles::resolve_external_guard(klass); 1652 if (k_mirror == NULL) { 1653 return JVMTI_ERROR_INVALID_CLASS; 1654 } 1655 if (java_lang_Class::is_primitive(k_mirror)) { 1656 return JVMTI_ERROR_NONE; 1657 } 1658 k_oop = java_lang_Class::as_klassOop(k_mirror); 1659 if (k_oop == NULL) { 1660 return JVMTI_ERROR_INVALID_CLASS; 1661 } 1662 } 1663 1664 Thread *thread = Thread::current(); 1665 HandleMark hm(thread); 1666 KlassHandle kh (thread, k_oop); 1667 1668 TraceTime t("IterateThroughHeap", TraceJVMTIObjectTagging); 1669 JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, kh, callbacks, user_data); 1670 return JVMTI_ERROR_NONE; 1671 } /* end IterateThroughHeap */ 1672 1673 1674 // tag_ptr - pre-checked for NULL 1675 jvmtiError 1676 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) { 1677 oop o = JNIHandles::resolve_external_guard(object); 1678 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT); 1679 *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object); 1680 return JVMTI_ERROR_NONE; 1681 } /* end GetTag */ 1682 1683 1684 jvmtiError 1685 JvmtiEnv::SetTag(jobject object, jlong tag) { 1686 oop o = JNIHandles::resolve_external_guard(object); 1687 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT); 1688 JvmtiTagMap::tag_map_for(this)->set_tag(object, tag); 1689 return JVMTI_ERROR_NONE; 1690 } /* end SetTag */ 1691 1692 1693 // tag_count - pre-checked to be greater than or equal to 0 1694 // tags - pre-checked for NULL 1695 // count_ptr - pre-checked for NULL 1696 // object_result_ptr - NULL is a valid value, must be checked 1697 // tag_result_ptr - NULL is a valid value, must be checked 1698 jvmtiError 1699 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { 1700 TraceTime t("GetObjectsWithTags", TraceJVMTIObjectTagging); 1701 return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr); 1702 } /* end GetObjectsWithTags */ 1703 1704 1705 jvmtiError 1706 JvmtiEnv::ForceGarbageCollection() { 1707 Universe::heap()->collect(GCCause::_jvmti_force_gc); 1708 return JVMTI_ERROR_NONE; 1709 } /* end ForceGarbageCollection */ 1710 1711 1712 // 1713 // Heap (1.0) functions 1714 // 1715 1716 // object_reference_callback - pre-checked for NULL 1717 // user_data - NULL is a valid value, must be checked 1718 jvmtiError 1719 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) { 1720 oop o = JNIHandles::resolve_external_guard(object); 1721 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT); 1722 JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data); 1723 return JVMTI_ERROR_NONE; 1724 } /* end IterateOverObjectsReachableFromObject */ 1725 1726 1727 // heap_root_callback - NULL is a valid value, must be checked 1728 // stack_ref_callback - NULL is a valid value, must be checked 1729 // object_ref_callback - NULL is a valid value, must be checked 1730 // user_data - NULL is a valid value, must be checked 1731 jvmtiError 1732 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) { 1733 TraceTime t("IterateOverReachableObjects", TraceJVMTIObjectTagging); 1734 JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data); 1735 return JVMTI_ERROR_NONE; 1736 } /* end IterateOverReachableObjects */ 1737 1738 1739 // heap_object_callback - pre-checked for NULL 1740 // user_data - NULL is a valid value, must be checked 1741 jvmtiError 1742 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) { 1743 TraceTime t("IterateOverHeap", TraceJVMTIObjectTagging); 1744 Thread *thread = Thread::current(); 1745 HandleMark hm(thread); 1746 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, KlassHandle(), heap_object_callback, user_data); 1747 return JVMTI_ERROR_NONE; 1748 } /* end IterateOverHeap */ 1749 1750 1751 // k_mirror - may be primitive, this must be checked 1752 // heap_object_callback - pre-checked for NULL 1753 // user_data - NULL is a valid value, must be checked 1754 jvmtiError 1755 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) { 1756 if (java_lang_Class::is_primitive(k_mirror)) { 1757 // DO PRIMITIVE CLASS PROCESSING 1758 return JVMTI_ERROR_NONE; 1759 } 1760 klassOop k_oop = java_lang_Class::as_klassOop(k_mirror); 1761 if (k_oop == NULL) { 1762 return JVMTI_ERROR_INVALID_CLASS; 1763 } 1764 Thread *thread = Thread::current(); 1765 HandleMark hm(thread); 1766 KlassHandle klass (thread, k_oop); 1767 TraceTime t("IterateOverInstancesOfClass", TraceJVMTIObjectTagging); 1768 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data); 1769 return JVMTI_ERROR_NONE; 1770 } /* end IterateOverInstancesOfClass */ 1771 1772 1773 // 1774 // Local Variable functions 1775 // 1776 1777 // Threads_lock NOT held, java_thread not protected by lock 1778 // java_thread - pre-checked 1779 // java_thread - unchecked 1780 // depth - pre-checked as non-negative 1781 // value_ptr - pre-checked for NULL 1782 jvmtiError 1783 JvmtiEnv::GetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject* value_ptr) { 1784 JavaThread* current_thread = JavaThread::current(); 1785 // rm object is created to clean up the javaVFrame created in 1786 // doit_prologue(), but after doit() is finished with it. 1787 ResourceMark rm(current_thread); 1788 1789 VM_GetOrSetLocal op(java_thread, current_thread, depth, slot); 1790 VMThread::execute(&op); 1791 jvmtiError err = op.result(); 1792 if (err != JVMTI_ERROR_NONE) { 1793 return err; 1794 } else { 1795 *value_ptr = op.value().l; 1796 return JVMTI_ERROR_NONE; 1797 } 1798 } /* end GetLocalObject */ 1799 1800 1801 // Threads_lock NOT held, java_thread not protected by lock 1802 // java_thread - pre-checked 1803 // java_thread - unchecked 1804 // depth - pre-checked as non-negative 1805 // value_ptr - pre-checked for NULL 1806 jvmtiError 1807 JvmtiEnv::GetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint* value_ptr) { 1808 // rm object is created to clean up the javaVFrame created in 1809 // doit_prologue(), but after doit() is finished with it. 1810 ResourceMark rm; 1811 1812 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT); 1813 VMThread::execute(&op); 1814 *value_ptr = op.value().i; 1815 return op.result(); 1816 } /* end GetLocalInt */ 1817 1818 1819 // Threads_lock NOT held, java_thread not protected by lock 1820 // java_thread - pre-checked 1821 // java_thread - unchecked 1822 // depth - pre-checked as non-negative 1823 // value_ptr - pre-checked for NULL 1824 jvmtiError 1825 JvmtiEnv::GetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong* value_ptr) { 1826 // rm object is created to clean up the javaVFrame created in 1827 // doit_prologue(), but after doit() is finished with it. 1828 ResourceMark rm; 1829 1830 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG); 1831 VMThread::execute(&op); 1832 *value_ptr = op.value().j; 1833 return op.result(); 1834 } /* end GetLocalLong */ 1835 1836 1837 // Threads_lock NOT held, java_thread not protected by lock 1838 // java_thread - pre-checked 1839 // java_thread - unchecked 1840 // depth - pre-checked as non-negative 1841 // value_ptr - pre-checked for NULL 1842 jvmtiError 1843 JvmtiEnv::GetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat* value_ptr) { 1844 // rm object is created to clean up the javaVFrame created in 1845 // doit_prologue(), but after doit() is finished with it. 1846 ResourceMark rm; 1847 1848 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT); 1849 VMThread::execute(&op); 1850 *value_ptr = op.value().f; 1851 return op.result(); 1852 } /* end GetLocalFloat */ 1853 1854 1855 // Threads_lock NOT held, java_thread not protected by lock 1856 // java_thread - pre-checked 1857 // java_thread - unchecked 1858 // depth - pre-checked as non-negative 1859 // value_ptr - pre-checked for NULL 1860 jvmtiError 1861 JvmtiEnv::GetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble* value_ptr) { 1862 // rm object is created to clean up the javaVFrame created in 1863 // doit_prologue(), but after doit() is finished with it. 1864 ResourceMark rm; 1865 1866 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE); 1867 VMThread::execute(&op); 1868 *value_ptr = op.value().d; 1869 return op.result(); 1870 } /* end GetLocalDouble */ 1871 1872 1873 // Threads_lock NOT held, java_thread not protected by lock 1874 // java_thread - pre-checked 1875 // java_thread - unchecked 1876 // depth - pre-checked as non-negative 1877 jvmtiError 1878 JvmtiEnv::SetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject value) { 1879 // rm object is created to clean up the javaVFrame created in 1880 // doit_prologue(), but after doit() is finished with it. 1881 ResourceMark rm; 1882 jvalue val; 1883 val.l = value; 1884 VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val); 1885 VMThread::execute(&op); 1886 return op.result(); 1887 } /* end SetLocalObject */ 1888 1889 1890 // Threads_lock NOT held, java_thread not protected by lock 1891 // java_thread - pre-checked 1892 // java_thread - unchecked 1893 // depth - pre-checked as non-negative 1894 jvmtiError 1895 JvmtiEnv::SetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint value) { 1896 // rm object is created to clean up the javaVFrame created in 1897 // doit_prologue(), but after doit() is finished with it. 1898 ResourceMark rm; 1899 jvalue val; 1900 val.i = value; 1901 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val); 1902 VMThread::execute(&op); 1903 return op.result(); 1904 } /* end SetLocalInt */ 1905 1906 1907 // Threads_lock NOT held, java_thread not protected by lock 1908 // java_thread - pre-checked 1909 // java_thread - unchecked 1910 // depth - pre-checked as non-negative 1911 jvmtiError 1912 JvmtiEnv::SetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong value) { 1913 // rm object is created to clean up the javaVFrame created in 1914 // doit_prologue(), but after doit() is finished with it. 1915 ResourceMark rm; 1916 jvalue val; 1917 val.j = value; 1918 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val); 1919 VMThread::execute(&op); 1920 return op.result(); 1921 } /* end SetLocalLong */ 1922 1923 1924 // Threads_lock NOT held, java_thread not protected by lock 1925 // java_thread - pre-checked 1926 // java_thread - unchecked 1927 // depth - pre-checked as non-negative 1928 jvmtiError 1929 JvmtiEnv::SetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat value) { 1930 // rm object is created to clean up the javaVFrame created in 1931 // doit_prologue(), but after doit() is finished with it. 1932 ResourceMark rm; 1933 jvalue val; 1934 val.f = value; 1935 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val); 1936 VMThread::execute(&op); 1937 return op.result(); 1938 } /* end SetLocalFloat */ 1939 1940 1941 // Threads_lock NOT held, java_thread not protected by lock 1942 // java_thread - pre-checked 1943 // java_thread - unchecked 1944 // depth - pre-checked as non-negative 1945 jvmtiError 1946 JvmtiEnv::SetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble value) { 1947 // rm object is created to clean up the javaVFrame created in 1948 // doit_prologue(), but after doit() is finished with it. 1949 ResourceMark rm; 1950 jvalue val; 1951 val.d = value; 1952 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val); 1953 VMThread::execute(&op); 1954 return op.result(); 1955 } /* end SetLocalDouble */ 1956 1957 1958 // 1959 // Breakpoint functions 1960 // 1961 1962 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method 1963 jvmtiError 1964 JvmtiEnv::SetBreakpoint(methodOop method_oop, jlocation location) { 1965 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 1966 if (location < 0) { // simple invalid location check first 1967 return JVMTI_ERROR_INVALID_LOCATION; 1968 } 1969 // verify that the breakpoint is not past the end of the method 1970 if (location >= (jlocation) method_oop->code_size()) { 1971 return JVMTI_ERROR_INVALID_LOCATION; 1972 } 1973 1974 ResourceMark rm; 1975 JvmtiBreakpoint bp(method_oop, location); 1976 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints(); 1977 if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE) 1978 return JVMTI_ERROR_DUPLICATE; 1979 1980 if (TraceJVMTICalls) { 1981 jvmti_breakpoints.print(); 1982 } 1983 1984 return JVMTI_ERROR_NONE; 1985 } /* end SetBreakpoint */ 1986 1987 1988 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method 1989 jvmtiError 1990 JvmtiEnv::ClearBreakpoint(methodOop method_oop, jlocation location) { 1991 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 1992 1993 if (location < 0) { // simple invalid location check first 1994 return JVMTI_ERROR_INVALID_LOCATION; 1995 } 1996 1997 // verify that the breakpoint is not past the end of the method 1998 if (location >= (jlocation) method_oop->code_size()) { 1999 return JVMTI_ERROR_INVALID_LOCATION; 2000 } 2001 2002 JvmtiBreakpoint bp(method_oop, location); 2003 2004 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints(); 2005 if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND) 2006 return JVMTI_ERROR_NOT_FOUND; 2007 2008 if (TraceJVMTICalls) { 2009 jvmti_breakpoints.print(); 2010 } 2011 2012 return JVMTI_ERROR_NONE; 2013 } /* end ClearBreakpoint */ 2014 2015 2016 // 2017 // Watched Field functions 2018 // 2019 2020 jvmtiError 2021 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) { 2022 // make sure we haven't set this watch before 2023 if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE; 2024 fdesc_ptr->set_is_field_access_watched(true); 2025 update_klass_field_access_flag(fdesc_ptr); 2026 2027 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true); 2028 2029 return JVMTI_ERROR_NONE; 2030 } /* end SetFieldAccessWatch */ 2031 2032 2033 jvmtiError 2034 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) { 2035 // make sure we have a watch to clear 2036 if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND; 2037 fdesc_ptr->set_is_field_access_watched(false); 2038 update_klass_field_access_flag(fdesc_ptr); 2039 2040 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false); 2041 2042 return JVMTI_ERROR_NONE; 2043 } /* end ClearFieldAccessWatch */ 2044 2045 2046 jvmtiError 2047 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) { 2048 // make sure we haven't set this watch before 2049 if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE; 2050 fdesc_ptr->set_is_field_modification_watched(true); 2051 update_klass_field_access_flag(fdesc_ptr); 2052 2053 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true); 2054 2055 return JVMTI_ERROR_NONE; 2056 } /* end SetFieldModificationWatch */ 2057 2058 2059 jvmtiError 2060 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) { 2061 // make sure we have a watch to clear 2062 if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND; 2063 fdesc_ptr->set_is_field_modification_watched(false); 2064 update_klass_field_access_flag(fdesc_ptr); 2065 2066 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false); 2067 2068 return JVMTI_ERROR_NONE; 2069 } /* end ClearFieldModificationWatch */ 2070 2071 // 2072 // Class functions 2073 // 2074 2075 2076 // k_mirror - may be primitive, this must be checked 2077 // signature_ptr - NULL is a valid value, must be checked 2078 // generic_ptr - NULL is a valid value, must be checked 2079 jvmtiError 2080 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) { 2081 ResourceMark rm; 2082 bool isPrimitive = java_lang_Class::is_primitive(k_mirror); 2083 klassOop k = NULL; 2084 if (!isPrimitive) { 2085 k = java_lang_Class::as_klassOop(k_mirror); 2086 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS); 2087 } 2088 if (signature_ptr != NULL) { 2089 char* result = NULL; 2090 if (isPrimitive) { 2091 char tchar = type2char(java_lang_Class::primitive_type(k_mirror)); 2092 result = (char*) jvmtiMalloc(2); 2093 result[0] = tchar; 2094 result[1] = '\0'; 2095 } else { 2096 const char* class_sig = Klass::cast(k)->signature_name(); 2097 result = (char *) jvmtiMalloc(strlen(class_sig)+1); 2098 strcpy(result, class_sig); 2099 } 2100 *signature_ptr = result; 2101 } 2102 if (generic_ptr != NULL) { 2103 *generic_ptr = NULL; 2104 if (!isPrimitive && Klass::cast(k)->oop_is_instance()) { 2105 symbolOop soo = instanceKlass::cast(k)->generic_signature(); 2106 if (soo != NULL) { 2107 const char *gen_sig = soo->as_C_string(); 2108 if (gen_sig != NULL) { 2109 char* gen_result; 2110 jvmtiError err = allocate(strlen(gen_sig) + 1, 2111 (unsigned char **)&gen_result); 2112 if (err != JVMTI_ERROR_NONE) { 2113 return err; 2114 } 2115 strcpy(gen_result, gen_sig); 2116 *generic_ptr = gen_result; 2117 } 2118 } 2119 } 2120 } 2121 return JVMTI_ERROR_NONE; 2122 } /* end GetClassSignature */ 2123 2124 2125 // k_mirror - may be primitive, this must be checked 2126 // status_ptr - pre-checked for NULL 2127 jvmtiError 2128 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) { 2129 jint result = 0; 2130 if (java_lang_Class::is_primitive(k_mirror)) { 2131 result |= JVMTI_CLASS_STATUS_PRIMITIVE; 2132 } else { 2133 klassOop k = java_lang_Class::as_klassOop(k_mirror); 2134 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS); 2135 result = Klass::cast(k)->jvmti_class_status(); 2136 } 2137 *status_ptr = result; 2138 2139 return JVMTI_ERROR_NONE; 2140 } /* end GetClassStatus */ 2141 2142 2143 // k_mirror - may be primitive, this must be checked 2144 // source_name_ptr - pre-checked for NULL 2145 jvmtiError 2146 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) { 2147 if (java_lang_Class::is_primitive(k_mirror)) { 2148 return JVMTI_ERROR_ABSENT_INFORMATION; 2149 } 2150 klassOop k_klass = java_lang_Class::as_klassOop(k_mirror); 2151 NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS); 2152 2153 if (!Klass::cast(k_klass)->oop_is_instance()) { 2154 return JVMTI_ERROR_ABSENT_INFORMATION; 2155 } 2156 2157 symbolOop sfnOop = instanceKlass::cast(k_klass)->source_file_name(); 2158 NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION); 2159 { 2160 JavaThread* current_thread = JavaThread::current(); 2161 ResourceMark rm(current_thread); 2162 const char* sfncp = (const char*) sfnOop->as_C_string(); 2163 *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1); 2164 strcpy(*source_name_ptr, sfncp); 2165 } 2166 2167 return JVMTI_ERROR_NONE; 2168 } /* end GetSourceFileName */ 2169 2170 2171 // k_mirror - may be primitive, this must be checked 2172 // modifiers_ptr - pre-checked for NULL 2173 jvmtiError 2174 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) { 2175 JavaThread* current_thread = JavaThread::current(); 2176 jint result = 0; 2177 if (!java_lang_Class::is_primitive(k_mirror)) { 2178 klassOop k = java_lang_Class::as_klassOop(k_mirror); 2179 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS); 2180 assert((Klass::cast(k)->oop_is_instance() || Klass::cast(k)->oop_is_array()), "should be an instance or an array klass"); 2181 result = Klass::cast(k)->compute_modifier_flags(current_thread); 2182 JavaThread* THREAD = current_thread; // pass to macros 2183 if (HAS_PENDING_EXCEPTION) { 2184 CLEAR_PENDING_EXCEPTION; 2185 return JVMTI_ERROR_INTERNAL; 2186 }; 2187 2188 // Reset the deleted ACC_SUPER bit ( deleted in compute_modifier_flags()). 2189 if(Klass::cast(k)->is_super()) { 2190 result |= JVM_ACC_SUPER; 2191 } 2192 } else { 2193 result = (JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC); 2194 } 2195 *modifiers_ptr = result; 2196 2197 return JVMTI_ERROR_NONE; 2198 } /* end GetClassModifiers */ 2199 2200 2201 // k_mirror - may be primitive, this must be checked 2202 // method_count_ptr - pre-checked for NULL 2203 // methods_ptr - pre-checked for NULL 2204 jvmtiError 2205 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) { 2206 JavaThread* current_thread = JavaThread::current(); 2207 HandleMark hm(current_thread); 2208 2209 if (java_lang_Class::is_primitive(k_mirror)) { 2210 *method_count_ptr = 0; 2211 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID)); 2212 return JVMTI_ERROR_NONE; 2213 } 2214 klassOop k = java_lang_Class::as_klassOop(k_mirror); 2215 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS); 2216 2217 // Return CLASS_NOT_PREPARED error as per JVMTI spec. 2218 if (!(Klass::cast(k)->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) { 2219 return JVMTI_ERROR_CLASS_NOT_PREPARED; 2220 } 2221 2222 if (!Klass::cast(k)->oop_is_instance()) { 2223 *method_count_ptr = 0; 2224 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID)); 2225 return JVMTI_ERROR_NONE; 2226 } 2227 instanceKlassHandle instanceK_h(current_thread, k); 2228 // Allocate the result and fill it in 2229 int result_length = instanceK_h->methods()->length(); 2230 jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID)); 2231 int index; 2232 if (JvmtiExport::can_maintain_original_method_order()) { 2233 // Use the original method ordering indices stored in the class, so we can emit 2234 // jmethodIDs in the order they appeared in the class file 2235 for (index = 0; index < result_length; index++) { 2236 methodOop m = methodOop(instanceK_h->methods()->obj_at(index)); 2237 int original_index = instanceK_h->method_ordering()->int_at(index); 2238 assert(original_index >= 0 && original_index < result_length, "invalid original method index"); 2239 jmethodID id = m->jmethod_id(); 2240 result_list[original_index] = id; 2241 } 2242 } else { 2243 // otherwise just copy in any order 2244 for (index = 0; index < result_length; index++) { 2245 methodOop m = methodOop(instanceK_h->methods()->obj_at(index)); 2246 jmethodID id = m->jmethod_id(); 2247 result_list[index] = id; 2248 } 2249 } 2250 // Fill in return value. 2251 *method_count_ptr = result_length; 2252 *methods_ptr = result_list; 2253 2254 return JVMTI_ERROR_NONE; 2255 } /* end GetClassMethods */ 2256 2257 2258 // k_mirror - may be primitive, this must be checked 2259 // field_count_ptr - pre-checked for NULL 2260 // fields_ptr - pre-checked for NULL 2261 jvmtiError 2262 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) { 2263 if (java_lang_Class::is_primitive(k_mirror)) { 2264 *field_count_ptr = 0; 2265 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID)); 2266 return JVMTI_ERROR_NONE; 2267 } 2268 JavaThread* current_thread = JavaThread::current(); 2269 HandleMark hm(current_thread); 2270 klassOop k = java_lang_Class::as_klassOop(k_mirror); 2271 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS); 2272 2273 // Return CLASS_NOT_PREPARED error as per JVMTI spec. 2274 if (!(Klass::cast(k)->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) { 2275 return JVMTI_ERROR_CLASS_NOT_PREPARED; 2276 } 2277 2278 if (!Klass::cast(k)->oop_is_instance()) { 2279 *field_count_ptr = 0; 2280 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID)); 2281 return JVMTI_ERROR_NONE; 2282 } 2283 2284 2285 instanceKlassHandle instanceK_h(current_thread, k); 2286 2287 int result_count = 0; 2288 // First, count the fields. 2289 FilteredFieldStream flds(instanceK_h, true, true); 2290 result_count = flds.field_count(); 2291 2292 // Allocate the result and fill it in 2293 jfieldID* result_list = (jfieldID*) jvmtiMalloc(result_count * sizeof(jfieldID)); 2294 // The JVMTI spec requires fields in the order they occur in the class file, 2295 // this is the reverse order of what FieldStream hands out. 2296 int id_index = (result_count - 1); 2297 2298 for (FilteredFieldStream src_st(instanceK_h, true, true); !src_st.eos(); src_st.next()) { 2299 result_list[id_index--] = jfieldIDWorkaround::to_jfieldID( 2300 instanceK_h, src_st.offset(), 2301 src_st.access_flags().is_static()); 2302 } 2303 assert(id_index == -1, "just checking"); 2304 // Fill in the results 2305 *field_count_ptr = result_count; 2306 *fields_ptr = result_list; 2307 2308 return JVMTI_ERROR_NONE; 2309 } /* end GetClassFields */ 2310 2311 2312 // k_mirror - may be primitive, this must be checked 2313 // interface_count_ptr - pre-checked for NULL 2314 // interfaces_ptr - pre-checked for NULL 2315 jvmtiError 2316 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) { 2317 { 2318 if (java_lang_Class::is_primitive(k_mirror)) { 2319 *interface_count_ptr = 0; 2320 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass)); 2321 return JVMTI_ERROR_NONE; 2322 } 2323 JavaThread* current_thread = JavaThread::current(); 2324 HandleMark hm(current_thread); 2325 klassOop k = java_lang_Class::as_klassOop(k_mirror); 2326 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS); 2327 2328 // Return CLASS_NOT_PREPARED error as per JVMTI spec. 2329 if (!(Klass::cast(k)->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) 2330 return JVMTI_ERROR_CLASS_NOT_PREPARED; 2331 2332 if (!Klass::cast(k)->oop_is_instance()) { 2333 *interface_count_ptr = 0; 2334 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass)); 2335 return JVMTI_ERROR_NONE; 2336 } 2337 2338 objArrayHandle interface_list(current_thread, instanceKlass::cast(k)->local_interfaces()); 2339 const int result_length = (interface_list.is_null() ? 0 : interface_list->length()); 2340 jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass)); 2341 for (int i_index = 0; i_index < result_length; i_index += 1) { 2342 oop oop_at = interface_list->obj_at(i_index); 2343 assert(oop_at->is_klass(), "interfaces must be klassOops"); 2344 klassOop klassOop_at = klassOop(oop_at); // ???: is there a better way? 2345 assert(Klass::cast(klassOop_at)->is_interface(), "interfaces must be interfaces"); 2346 oop mirror_at = Klass::cast(klassOop_at)->java_mirror(); 2347 Handle handle_at = Handle(current_thread, mirror_at); 2348 result_list[i_index] = (jclass) jni_reference(handle_at); 2349 } 2350 *interface_count_ptr = result_length; 2351 *interfaces_ptr = result_list; 2352 } 2353 2354 return JVMTI_ERROR_NONE; 2355 } /* end GetImplementedInterfaces */ 2356 2357 2358 // k_mirror - may be primitive, this must be checked 2359 // minor_version_ptr - pre-checked for NULL 2360 // major_version_ptr - pre-checked for NULL 2361 jvmtiError 2362 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) { 2363 if (java_lang_Class::is_primitive(k_mirror)) { 2364 return JVMTI_ERROR_ABSENT_INFORMATION; 2365 } 2366 klassOop k_oop = java_lang_Class::as_klassOop(k_mirror); 2367 Thread *thread = Thread::current(); 2368 HandleMark hm(thread); 2369 KlassHandle klass(thread, k_oop); 2370 2371 jint status = klass->jvmti_class_status(); 2372 if (status & (JVMTI_CLASS_STATUS_ERROR)) { 2373 return JVMTI_ERROR_INVALID_CLASS; 2374 } 2375 if (status & (JVMTI_CLASS_STATUS_ARRAY)) { 2376 return JVMTI_ERROR_ABSENT_INFORMATION; 2377 } 2378 2379 instanceKlassHandle ik(thread, k_oop); 2380 *minor_version_ptr = ik->minor_version(); 2381 *major_version_ptr = ik->major_version(); 2382 2383 return JVMTI_ERROR_NONE; 2384 } /* end GetClassVersionNumbers */ 2385 2386 2387 // k_mirror - may be primitive, this must be checked 2388 // constant_pool_count_ptr - pre-checked for NULL 2389 // constant_pool_byte_count_ptr - pre-checked for NULL 2390 // constant_pool_bytes_ptr - pre-checked for NULL 2391 jvmtiError 2392 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) { 2393 if (java_lang_Class::is_primitive(k_mirror)) { 2394 return JVMTI_ERROR_ABSENT_INFORMATION; 2395 } 2396 2397 klassOop k_oop = java_lang_Class::as_klassOop(k_mirror); 2398 Thread *thread = Thread::current(); 2399 HandleMark hm(thread); 2400 ResourceMark rm(thread); 2401 KlassHandle klass(thread, k_oop); 2402 2403 jint status = klass->jvmti_class_status(); 2404 if (status & (JVMTI_CLASS_STATUS_ERROR)) { 2405 return JVMTI_ERROR_INVALID_CLASS; 2406 } 2407 if (status & (JVMTI_CLASS_STATUS_ARRAY)) { 2408 return JVMTI_ERROR_ABSENT_INFORMATION; 2409 } 2410 2411 instanceKlassHandle ikh(thread, k_oop); 2412 constantPoolHandle constants(thread, ikh->constants()); 2413 ObjectLocker ol(constants, thread); // lock constant pool while we query it 2414 2415 JvmtiConstantPoolReconstituter reconstituter(ikh); 2416 if (reconstituter.get_error() != JVMTI_ERROR_NONE) { 2417 return reconstituter.get_error(); 2418 } 2419 2420 unsigned char *cpool_bytes; 2421 int cpool_size = reconstituter.cpool_size(); 2422 if (reconstituter.get_error() != JVMTI_ERROR_NONE) { 2423 return reconstituter.get_error(); 2424 } 2425 jvmtiError res = allocate(cpool_size, &cpool_bytes); 2426 if (res != JVMTI_ERROR_NONE) { 2427 return res; 2428 } 2429 reconstituter.copy_cpool_bytes(cpool_bytes); 2430 if (reconstituter.get_error() != JVMTI_ERROR_NONE) { 2431 return reconstituter.get_error(); 2432 } 2433 2434 *constant_pool_count_ptr = constants->length(); 2435 *constant_pool_byte_count_ptr = cpool_size; 2436 *constant_pool_bytes_ptr = cpool_bytes; 2437 2438 return JVMTI_ERROR_NONE; 2439 } /* end GetConstantPool */ 2440 2441 2442 // k_mirror - may be primitive, this must be checked 2443 // is_interface_ptr - pre-checked for NULL 2444 jvmtiError 2445 JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) { 2446 { 2447 bool result = false; 2448 if (!java_lang_Class::is_primitive(k_mirror)) { 2449 klassOop k = java_lang_Class::as_klassOop(k_mirror); 2450 if (k != NULL && Klass::cast(k)->is_interface()) { 2451 result = true; 2452 } 2453 } 2454 *is_interface_ptr = result; 2455 } 2456 2457 return JVMTI_ERROR_NONE; 2458 } /* end IsInterface */ 2459 2460 2461 // k_mirror - may be primitive, this must be checked 2462 // is_array_class_ptr - pre-checked for NULL 2463 jvmtiError 2464 JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) { 2465 { 2466 bool result = false; 2467 if (!java_lang_Class::is_primitive(k_mirror)) { 2468 klassOop k = java_lang_Class::as_klassOop(k_mirror); 2469 if (k != NULL && Klass::cast(k)->oop_is_array()) { 2470 result = true; 2471 } 2472 } 2473 *is_array_class_ptr = result; 2474 } 2475 2476 return JVMTI_ERROR_NONE; 2477 } /* end IsArrayClass */ 2478 2479 2480 // k_mirror - may be primitive, this must be checked 2481 // classloader_ptr - pre-checked for NULL 2482 jvmtiError 2483 JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) { 2484 { 2485 if (java_lang_Class::is_primitive(k_mirror)) { 2486 *classloader_ptr = (jclass) jni_reference(Handle()); 2487 return JVMTI_ERROR_NONE; 2488 } 2489 JavaThread* current_thread = JavaThread::current(); 2490 HandleMark hm(current_thread); 2491 klassOop k = java_lang_Class::as_klassOop(k_mirror); 2492 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS); 2493 2494 oop result_oop = Klass::cast(k)->class_loader(); 2495 if (result_oop == NULL) { 2496 *classloader_ptr = (jclass) jni_reference(Handle()); 2497 return JVMTI_ERROR_NONE; 2498 } 2499 Handle result_handle = Handle(current_thread, result_oop); 2500 jclass result_jnihandle = (jclass) jni_reference(result_handle); 2501 *classloader_ptr = result_jnihandle; 2502 } 2503 return JVMTI_ERROR_NONE; 2504 } /* end GetClassLoader */ 2505 2506 2507 // k_mirror - may be primitive, this must be checked 2508 // source_debug_extension_ptr - pre-checked for NULL 2509 jvmtiError 2510 JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) { 2511 { 2512 if (java_lang_Class::is_primitive(k_mirror)) { 2513 return JVMTI_ERROR_ABSENT_INFORMATION; 2514 } 2515 klassOop k = java_lang_Class::as_klassOop(k_mirror); 2516 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS); 2517 if (!Klass::cast(k)->oop_is_instance()) { 2518 return JVMTI_ERROR_ABSENT_INFORMATION; 2519 } 2520 symbolOop sdeOop = instanceKlass::cast(k)->source_debug_extension(); 2521 NULL_CHECK(sdeOop, JVMTI_ERROR_ABSENT_INFORMATION); 2522 2523 { 2524 JavaThread* current_thread = JavaThread::current(); 2525 ResourceMark rm(current_thread); 2526 const char* sdecp = (const char*) sdeOop->as_C_string(); 2527 *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sdecp)+1); 2528 strcpy(*source_debug_extension_ptr, sdecp); 2529 } 2530 } 2531 2532 return JVMTI_ERROR_NONE; 2533 } /* end GetSourceDebugExtension */ 2534 2535 // 2536 // Object functions 2537 // 2538 2539 // hash_code_ptr - pre-checked for NULL 2540 jvmtiError 2541 JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) { 2542 oop mirror = JNIHandles::resolve_external_guard(object); 2543 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT); 2544 NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER); 2545 2546 { 2547 jint result = (jint) mirror->identity_hash(); 2548 *hash_code_ptr = result; 2549 } 2550 return JVMTI_ERROR_NONE; 2551 } /* end GetObjectHashCode */ 2552 2553 2554 // info_ptr - pre-checked for NULL 2555 jvmtiError 2556 JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) { 2557 JavaThread* calling_thread = JavaThread::current(); 2558 jvmtiError err = get_object_monitor_usage(calling_thread, object, info_ptr); 2559 if (err == JVMTI_ERROR_THREAD_NOT_SUSPENDED) { 2560 // Some of the critical threads were not suspended. go to a safepoint and try again 2561 VM_GetObjectMonitorUsage op(this, calling_thread, object, info_ptr); 2562 VMThread::execute(&op); 2563 err = op.result(); 2564 } 2565 return err; 2566 } /* end GetObjectMonitorUsage */ 2567 2568 2569 // 2570 // Field functions 2571 // 2572 2573 // name_ptr - NULL is a valid value, must be checked 2574 // signature_ptr - NULL is a valid value, must be checked 2575 // generic_ptr - NULL is a valid value, must be checked 2576 jvmtiError 2577 JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) { 2578 JavaThread* current_thread = JavaThread::current(); 2579 ResourceMark rm(current_thread); 2580 if (name_ptr == NULL) { 2581 // just don't return the name 2582 } else { 2583 const char* fieldName = fdesc_ptr->name()->as_C_string(); 2584 *name_ptr = (char*) jvmtiMalloc(strlen(fieldName) + 1); 2585 if (*name_ptr == NULL) 2586 return JVMTI_ERROR_OUT_OF_MEMORY; 2587 strcpy(*name_ptr, fieldName); 2588 } 2589 if (signature_ptr== NULL) { 2590 // just don't return the signature 2591 } else { 2592 const char* fieldSignature = fdesc_ptr->signature()->as_C_string(); 2593 *signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1); 2594 if (*signature_ptr == NULL) 2595 return JVMTI_ERROR_OUT_OF_MEMORY; 2596 strcpy(*signature_ptr, fieldSignature); 2597 } 2598 if (generic_ptr != NULL) { 2599 *generic_ptr = NULL; 2600 symbolOop soop = fdesc_ptr->generic_signature(); 2601 if (soop != NULL) { 2602 const char* gen_sig = soop->as_C_string(); 2603 if (gen_sig != NULL) { 2604 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr); 2605 if (err != JVMTI_ERROR_NONE) { 2606 return err; 2607 } 2608 strcpy(*generic_ptr, gen_sig); 2609 } 2610 } 2611 } 2612 return JVMTI_ERROR_NONE; 2613 } /* end GetFieldName */ 2614 2615 2616 // declaring_class_ptr - pre-checked for NULL 2617 jvmtiError 2618 JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) { 2619 2620 *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder()); 2621 return JVMTI_ERROR_NONE; 2622 } /* end GetFieldDeclaringClass */ 2623 2624 2625 // modifiers_ptr - pre-checked for NULL 2626 jvmtiError 2627 JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) { 2628 2629 AccessFlags resultFlags = fdesc_ptr->access_flags(); 2630 jint result = resultFlags.as_int(); 2631 *modifiers_ptr = result; 2632 2633 return JVMTI_ERROR_NONE; 2634 } /* end GetFieldModifiers */ 2635 2636 2637 // is_synthetic_ptr - pre-checked for NULL 2638 jvmtiError 2639 JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) { 2640 *is_synthetic_ptr = fdesc_ptr->is_synthetic(); 2641 return JVMTI_ERROR_NONE; 2642 } /* end IsFieldSynthetic */ 2643 2644 2645 // 2646 // Method functions 2647 // 2648 2649 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2650 // name_ptr - NULL is a valid value, must be checked 2651 // signature_ptr - NULL is a valid value, must be checked 2652 // generic_ptr - NULL is a valid value, must be checked 2653 jvmtiError 2654 JvmtiEnv::GetMethodName(methodOop method_oop, char** name_ptr, char** signature_ptr, char** generic_ptr) { 2655 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2656 JavaThread* current_thread = JavaThread::current(); 2657 2658 ResourceMark rm(current_thread); // get the utf8 name and signature 2659 if (name_ptr == NULL) { 2660 // just don't return the name 2661 } else { 2662 const char* utf8_name = (const char *) method_oop->name()->as_utf8(); 2663 *name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1); 2664 strcpy(*name_ptr, utf8_name); 2665 } 2666 if (signature_ptr == NULL) { 2667 // just don't return the signature 2668 } else { 2669 const char* utf8_signature = (const char *) method_oop->signature()->as_utf8(); 2670 *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1); 2671 strcpy(*signature_ptr, utf8_signature); 2672 } 2673 2674 if (generic_ptr != NULL) { 2675 *generic_ptr = NULL; 2676 symbolOop soop = method_oop->generic_signature(); 2677 if (soop != NULL) { 2678 const char* gen_sig = soop->as_C_string(); 2679 if (gen_sig != NULL) { 2680 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr); 2681 if (err != JVMTI_ERROR_NONE) { 2682 return err; 2683 } 2684 strcpy(*generic_ptr, gen_sig); 2685 } 2686 } 2687 } 2688 return JVMTI_ERROR_NONE; 2689 } /* end GetMethodName */ 2690 2691 2692 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2693 // declaring_class_ptr - pre-checked for NULL 2694 jvmtiError 2695 JvmtiEnv::GetMethodDeclaringClass(methodOop method_oop, jclass* declaring_class_ptr) { 2696 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2697 (*declaring_class_ptr) = get_jni_class_non_null(method_oop->method_holder()); 2698 return JVMTI_ERROR_NONE; 2699 } /* end GetMethodDeclaringClass */ 2700 2701 2702 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2703 // modifiers_ptr - pre-checked for NULL 2704 jvmtiError 2705 JvmtiEnv::GetMethodModifiers(methodOop method_oop, jint* modifiers_ptr) { 2706 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2707 (*modifiers_ptr) = method_oop->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2708 return JVMTI_ERROR_NONE; 2709 } /* end GetMethodModifiers */ 2710 2711 2712 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2713 // max_ptr - pre-checked for NULL 2714 jvmtiError 2715 JvmtiEnv::GetMaxLocals(methodOop method_oop, jint* max_ptr) { 2716 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2717 // get max stack 2718 (*max_ptr) = method_oop->max_locals(); 2719 return JVMTI_ERROR_NONE; 2720 } /* end GetMaxLocals */ 2721 2722 2723 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2724 // size_ptr - pre-checked for NULL 2725 jvmtiError 2726 JvmtiEnv::GetArgumentsSize(methodOop method_oop, jint* size_ptr) { 2727 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2728 // get size of arguments 2729 2730 (*size_ptr) = method_oop->size_of_parameters(); 2731 return JVMTI_ERROR_NONE; 2732 } /* end GetArgumentsSize */ 2733 2734 2735 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2736 // entry_count_ptr - pre-checked for NULL 2737 // table_ptr - pre-checked for NULL 2738 jvmtiError 2739 JvmtiEnv::GetLineNumberTable(methodOop method_oop, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) { 2740 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2741 if (!method_oop->has_linenumber_table()) { 2742 return (JVMTI_ERROR_ABSENT_INFORMATION); 2743 } 2744 2745 // The line number table is compressed so we don't know how big it is until decompressed. 2746 // Decompression is really fast so we just do it twice. 2747 2748 // Compute size of table 2749 jint num_entries = 0; 2750 CompressedLineNumberReadStream stream(method_oop->compressed_linenumber_table()); 2751 while (stream.read_pair()) { 2752 num_entries++; 2753 } 2754 jvmtiLineNumberEntry *jvmti_table = 2755 (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry))); 2756 2757 // Fill jvmti table 2758 if (num_entries > 0) { 2759 int index = 0; 2760 CompressedLineNumberReadStream stream(method_oop->compressed_linenumber_table()); 2761 while (stream.read_pair()) { 2762 jvmti_table[index].start_location = (jlocation) stream.bci(); 2763 jvmti_table[index].line_number = (jint) stream.line(); 2764 index++; 2765 } 2766 assert(index == num_entries, "sanity check"); 2767 } 2768 2769 // Set up results 2770 (*entry_count_ptr) = num_entries; 2771 (*table_ptr) = jvmti_table; 2772 2773 return JVMTI_ERROR_NONE; 2774 } /* end GetLineNumberTable */ 2775 2776 2777 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2778 // start_location_ptr - pre-checked for NULL 2779 // end_location_ptr - pre-checked for NULL 2780 jvmtiError 2781 JvmtiEnv::GetMethodLocation(methodOop method_oop, jlocation* start_location_ptr, jlocation* end_location_ptr) { 2782 2783 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2784 // get start and end location 2785 (*end_location_ptr) = (jlocation) (method_oop->code_size() - 1); 2786 if (method_oop->code_size() == 0) { 2787 // there is no code so there is no start location 2788 (*start_location_ptr) = (jlocation)(-1); 2789 } else { 2790 (*start_location_ptr) = (jlocation)(0); 2791 } 2792 2793 return JVMTI_ERROR_NONE; 2794 } /* end GetMethodLocation */ 2795 2796 2797 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2798 // entry_count_ptr - pre-checked for NULL 2799 // table_ptr - pre-checked for NULL 2800 jvmtiError 2801 JvmtiEnv::GetLocalVariableTable(methodOop method_oop, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) { 2802 2803 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2804 JavaThread* current_thread = JavaThread::current(); 2805 2806 // does the klass have any local variable information? 2807 instanceKlass* ik = instanceKlass::cast(method_oop->method_holder()); 2808 if (!ik->access_flags().has_localvariable_table()) { 2809 return (JVMTI_ERROR_ABSENT_INFORMATION); 2810 } 2811 2812 constantPoolOop constants = method_oop->constants(); 2813 NULL_CHECK(constants, JVMTI_ERROR_ABSENT_INFORMATION); 2814 2815 // in the vm localvariable table representation, 6 consecutive elements in the table 2816 // represent a 6-tuple of shorts 2817 // [start_pc, length, name_index, descriptor_index, signature_index, index] 2818 jint num_entries = method_oop->localvariable_table_length(); 2819 jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *) 2820 jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry))); 2821 2822 if (num_entries > 0) { 2823 LocalVariableTableElement* table = method_oop->localvariable_table_start(); 2824 for (int i = 0; i < num_entries; i++) { 2825 // get the 5 tuple information from the vm table 2826 jlocation start_location = (jlocation) table[i].start_bci; 2827 jint length = (jint) table[i].length; 2828 int name_index = (int) table[i].name_cp_index; 2829 int signature_index = (int) table[i].descriptor_cp_index; 2830 int generic_signature_index = (int) table[i].signature_cp_index; 2831 jint slot = (jint) table[i].slot; 2832 2833 // get utf8 name and signature 2834 char *name_buf = NULL; 2835 char *sig_buf = NULL; 2836 char *gen_sig_buf = NULL; 2837 { 2838 ResourceMark rm(current_thread); 2839 2840 const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8(); 2841 name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1); 2842 strcpy(name_buf, utf8_name); 2843 2844 const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8(); 2845 sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1); 2846 strcpy(sig_buf, utf8_signature); 2847 2848 if (generic_signature_index > 0) { 2849 const char *utf8_gen_sign = (const char *) 2850 constants->symbol_at(generic_signature_index)->as_utf8(); 2851 gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1); 2852 strcpy(gen_sig_buf, utf8_gen_sign); 2853 } 2854 } 2855 2856 // fill in the jvmti local variable table 2857 jvmti_table[i].start_location = start_location; 2858 jvmti_table[i].length = length; 2859 jvmti_table[i].name = name_buf; 2860 jvmti_table[i].signature = sig_buf; 2861 jvmti_table[i].generic_signature = gen_sig_buf; 2862 jvmti_table[i].slot = slot; 2863 } 2864 } 2865 2866 // set results 2867 (*entry_count_ptr) = num_entries; 2868 (*table_ptr) = jvmti_table; 2869 2870 return JVMTI_ERROR_NONE; 2871 } /* end GetLocalVariableTable */ 2872 2873 2874 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2875 // bytecode_count_ptr - pre-checked for NULL 2876 // bytecodes_ptr - pre-checked for NULL 2877 jvmtiError 2878 JvmtiEnv::GetBytecodes(methodOop method_oop, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) { 2879 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2880 2881 HandleMark hm; 2882 methodHandle method(method_oop); 2883 jint size = (jint)method->code_size(); 2884 jvmtiError err = allocate(size, bytecodes_ptr); 2885 if (err != JVMTI_ERROR_NONE) { 2886 return err; 2887 } 2888 2889 (*bytecode_count_ptr) = size; 2890 // get byte codes 2891 JvmtiClassFileReconstituter::copy_bytecodes(method, *bytecodes_ptr); 2892 2893 return JVMTI_ERROR_NONE; 2894 } /* end GetBytecodes */ 2895 2896 2897 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2898 // is_native_ptr - pre-checked for NULL 2899 jvmtiError 2900 JvmtiEnv::IsMethodNative(methodOop method_oop, jboolean* is_native_ptr) { 2901 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2902 (*is_native_ptr) = method_oop->is_native(); 2903 return JVMTI_ERROR_NONE; 2904 } /* end IsMethodNative */ 2905 2906 2907 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2908 // is_synthetic_ptr - pre-checked for NULL 2909 jvmtiError 2910 JvmtiEnv::IsMethodSynthetic(methodOop method_oop, jboolean* is_synthetic_ptr) { 2911 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2912 (*is_synthetic_ptr) = method_oop->is_synthetic(); 2913 return JVMTI_ERROR_NONE; 2914 } /* end IsMethodSynthetic */ 2915 2916 2917 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2918 // is_obsolete_ptr - pre-checked for NULL 2919 jvmtiError 2920 JvmtiEnv::IsMethodObsolete(methodOop method_oop, jboolean* is_obsolete_ptr) { 2921 if (use_version_1_0_semantics() && 2922 get_capabilities()->can_redefine_classes == 0) { 2923 // This JvmtiEnv requested version 1.0 semantics and this function 2924 // requires the can_redefine_classes capability in version 1.0 so 2925 // we need to return an error here. 2926 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY; 2927 } 2928 2929 if (method_oop == NULL || method_oop->is_obsolete()) { 2930 *is_obsolete_ptr = true; 2931 } else { 2932 *is_obsolete_ptr = false; 2933 } 2934 return JVMTI_ERROR_NONE; 2935 } /* end IsMethodObsolete */ 2936 2937 // 2938 // Raw Monitor functions 2939 // 2940 2941 // name - pre-checked for NULL 2942 // monitor_ptr - pre-checked for NULL 2943 jvmtiError 2944 JvmtiEnv::CreateRawMonitor(const char* name, jrawMonitorID* monitor_ptr) { 2945 JvmtiRawMonitor* rmonitor = new JvmtiRawMonitor(name); 2946 NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY); 2947 2948 *monitor_ptr = (jrawMonitorID)rmonitor; 2949 2950 return JVMTI_ERROR_NONE; 2951 } /* end CreateRawMonitor */ 2952 2953 2954 // rmonitor - pre-checked for validity 2955 jvmtiError 2956 JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) { 2957 if (Threads::number_of_threads() == 0) { 2958 // Remove this monitor from pending raw monitors list 2959 // if it has entered in onload or start phase. 2960 JvmtiPendingMonitors::destroy(rmonitor); 2961 } else { 2962 Thread* thread = Thread::current(); 2963 if (rmonitor->is_entered(thread)) { 2964 // The caller owns this monitor which we are about to destroy. 2965 // We exit the underlying synchronization object so that the 2966 // "delete monitor" call below can work without an assertion 2967 // failure on systems that don't like destroying synchronization 2968 // objects that are locked. 2969 int r; 2970 intptr_t recursion = rmonitor->recursions(); 2971 for (intptr_t i=0; i <= recursion; i++) { 2972 r = rmonitor->raw_exit(thread); 2973 assert(r == ObjectMonitor::OM_OK, "raw_exit should have worked"); 2974 if (r != ObjectMonitor::OM_OK) { // robustness 2975 return JVMTI_ERROR_INTERNAL; 2976 } 2977 } 2978 } 2979 if (rmonitor->owner() != NULL) { 2980 // The caller is trying to destroy a monitor that is locked by 2981 // someone else. While this is not forbidden by the JVMTI 2982 // spec, it will cause an assertion failure on systems that don't 2983 // like destroying synchronization objects that are locked. 2984 // We indicate a problem with the error return (and leak the 2985 // monitor's memory). 2986 return JVMTI_ERROR_NOT_MONITOR_OWNER; 2987 } 2988 } 2989 2990 delete rmonitor; 2991 2992 return JVMTI_ERROR_NONE; 2993 } /* end DestroyRawMonitor */ 2994 2995 2996 // rmonitor - pre-checked for validity 2997 jvmtiError 2998 JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) { 2999 if (Threads::number_of_threads() == 0) { 3000 // No JavaThreads exist so ObjectMonitor enter cannot be 3001 // used, add this raw monitor to the pending list. 3002 // The pending monitors will be actually entered when 3003 // the VM is setup. 3004 // See transition_pending_raw_monitors in create_vm() 3005 // in thread.cpp. 3006 JvmtiPendingMonitors::enter(rmonitor); 3007 } else { 3008 int r; 3009 Thread* thread = Thread::current(); 3010 3011 if (thread->is_Java_thread()) { 3012 JavaThread* current_thread = (JavaThread*)thread; 3013 3014 #ifdef PROPER_TRANSITIONS 3015 // Not really unknown but ThreadInVMfromNative does more than we want 3016 ThreadInVMfromUnknown __tiv; 3017 { 3018 ThreadBlockInVM __tbivm(current_thread); 3019 r = rmonitor->raw_enter(current_thread); 3020 } 3021 #else 3022 /* Transition to thread_blocked without entering vm state */ 3023 /* This is really evil. Normally you can't undo _thread_blocked */ 3024 /* transitions like this because it would cause us to miss a */ 3025 /* safepoint but since the thread was already in _thread_in_native */ 3026 /* the thread is not leaving a safepoint safe state and it will */ 3027 /* block when it tries to return from native. We can't safepoint */ 3028 /* block in here because we could deadlock the vmthread. Blech. */ 3029 3030 JavaThreadState state = current_thread->thread_state(); 3031 assert(state == _thread_in_native, "Must be _thread_in_native"); 3032 // frame should already be walkable since we are in native 3033 assert(!current_thread->has_last_Java_frame() || 3034 current_thread->frame_anchor()->walkable(), "Must be walkable"); 3035 current_thread->set_thread_state(_thread_blocked); 3036 3037 r = rmonitor->raw_enter(current_thread); 3038 // restore state, still at a safepoint safe state 3039 current_thread->set_thread_state(state); 3040 3041 #endif /* PROPER_TRANSITIONS */ 3042 assert(r == ObjectMonitor::OM_OK, "raw_enter should have worked"); 3043 } else { 3044 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) { 3045 r = rmonitor->raw_enter(thread); 3046 } else { 3047 ShouldNotReachHere(); 3048 } 3049 } 3050 3051 if (r != ObjectMonitor::OM_OK) { // robustness 3052 return JVMTI_ERROR_INTERNAL; 3053 } 3054 } 3055 return JVMTI_ERROR_NONE; 3056 } /* end RawMonitorEnter */ 3057 3058 3059 // rmonitor - pre-checked for validity 3060 jvmtiError 3061 JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) { 3062 jvmtiError err = JVMTI_ERROR_NONE; 3063 3064 if (Threads::number_of_threads() == 0) { 3065 // No JavaThreads exist so just remove this monitor from the pending list. 3066 // Bool value from exit is false if rmonitor is not in the list. 3067 if (!JvmtiPendingMonitors::exit(rmonitor)) { 3068 err = JVMTI_ERROR_NOT_MONITOR_OWNER; 3069 } 3070 } else { 3071 int r; 3072 Thread* thread = Thread::current(); 3073 3074 if (thread->is_Java_thread()) { 3075 JavaThread* current_thread = (JavaThread*)thread; 3076 #ifdef PROPER_TRANSITIONS 3077 // Not really unknown but ThreadInVMfromNative does more than we want 3078 ThreadInVMfromUnknown __tiv; 3079 #endif /* PROPER_TRANSITIONS */ 3080 r = rmonitor->raw_exit(current_thread); 3081 } else { 3082 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) { 3083 r = rmonitor->raw_exit(thread); 3084 } else { 3085 ShouldNotReachHere(); 3086 } 3087 } 3088 3089 if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) { 3090 err = JVMTI_ERROR_NOT_MONITOR_OWNER; 3091 } else { 3092 assert(r == ObjectMonitor::OM_OK, "raw_exit should have worked"); 3093 if (r != ObjectMonitor::OM_OK) { // robustness 3094 err = JVMTI_ERROR_INTERNAL; 3095 } 3096 } 3097 } 3098 return err; 3099 } /* end RawMonitorExit */ 3100 3101 3102 // rmonitor - pre-checked for validity 3103 jvmtiError 3104 JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) { 3105 int r; 3106 Thread* thread = Thread::current(); 3107 3108 if (thread->is_Java_thread()) { 3109 JavaThread* current_thread = (JavaThread*)thread; 3110 #ifdef PROPER_TRANSITIONS 3111 // Not really unknown but ThreadInVMfromNative does more than we want 3112 ThreadInVMfromUnknown __tiv; 3113 { 3114 ThreadBlockInVM __tbivm(current_thread); 3115 r = rmonitor->raw_wait(millis, true, current_thread); 3116 } 3117 #else 3118 /* Transition to thread_blocked without entering vm state */ 3119 /* This is really evil. Normally you can't undo _thread_blocked */ 3120 /* transitions like this because it would cause us to miss a */ 3121 /* safepoint but since the thread was already in _thread_in_native */ 3122 /* the thread is not leaving a safepoint safe state and it will */ 3123 /* block when it tries to return from native. We can't safepoint */ 3124 /* block in here because we could deadlock the vmthread. Blech. */ 3125 3126 JavaThreadState state = current_thread->thread_state(); 3127 assert(state == _thread_in_native, "Must be _thread_in_native"); 3128 // frame should already be walkable since we are in native 3129 assert(!current_thread->has_last_Java_frame() || 3130 current_thread->frame_anchor()->walkable(), "Must be walkable"); 3131 current_thread->set_thread_state(_thread_blocked); 3132 3133 r = rmonitor->raw_wait(millis, true, current_thread); 3134 // restore state, still at a safepoint safe state 3135 current_thread->set_thread_state(state); 3136 3137 #endif /* PROPER_TRANSITIONS */ 3138 } else { 3139 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) { 3140 r = rmonitor->raw_wait(millis, true, thread); 3141 } else { 3142 ShouldNotReachHere(); 3143 } 3144 } 3145 3146 switch (r) { 3147 case ObjectMonitor::OM_INTERRUPTED: 3148 return JVMTI_ERROR_INTERRUPT; 3149 case ObjectMonitor::OM_ILLEGAL_MONITOR_STATE: 3150 return JVMTI_ERROR_NOT_MONITOR_OWNER; 3151 } 3152 assert(r == ObjectMonitor::OM_OK, "raw_wait should have worked"); 3153 if (r != ObjectMonitor::OM_OK) { // robustness 3154 return JVMTI_ERROR_INTERNAL; 3155 } 3156 3157 return JVMTI_ERROR_NONE; 3158 } /* end RawMonitorWait */ 3159 3160 3161 // rmonitor - pre-checked for validity 3162 jvmtiError 3163 JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) { 3164 int r; 3165 Thread* thread = Thread::current(); 3166 3167 if (thread->is_Java_thread()) { 3168 JavaThread* current_thread = (JavaThread*)thread; 3169 // Not really unknown but ThreadInVMfromNative does more than we want 3170 ThreadInVMfromUnknown __tiv; 3171 r = rmonitor->raw_notify(current_thread); 3172 } else { 3173 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) { 3174 r = rmonitor->raw_notify(thread); 3175 } else { 3176 ShouldNotReachHere(); 3177 } 3178 } 3179 3180 if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) { 3181 return JVMTI_ERROR_NOT_MONITOR_OWNER; 3182 } 3183 assert(r == ObjectMonitor::OM_OK, "raw_notify should have worked"); 3184 if (r != ObjectMonitor::OM_OK) { // robustness 3185 return JVMTI_ERROR_INTERNAL; 3186 } 3187 3188 return JVMTI_ERROR_NONE; 3189 } /* end RawMonitorNotify */ 3190 3191 3192 // rmonitor - pre-checked for validity 3193 jvmtiError 3194 JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) { 3195 int r; 3196 Thread* thread = Thread::current(); 3197 3198 if (thread->is_Java_thread()) { 3199 JavaThread* current_thread = (JavaThread*)thread; 3200 ThreadInVMfromUnknown __tiv; 3201 r = rmonitor->raw_notifyAll(current_thread); 3202 } else { 3203 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) { 3204 r = rmonitor->raw_notifyAll(thread); 3205 } else { 3206 ShouldNotReachHere(); 3207 } 3208 } 3209 3210 if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) { 3211 return JVMTI_ERROR_NOT_MONITOR_OWNER; 3212 } 3213 assert(r == ObjectMonitor::OM_OK, "raw_notifyAll should have worked"); 3214 if (r != ObjectMonitor::OM_OK) { // robustness 3215 return JVMTI_ERROR_INTERNAL; 3216 } 3217 3218 return JVMTI_ERROR_NONE; 3219 } /* end RawMonitorNotifyAll */ 3220 3221 3222 // 3223 // JNI Function Interception functions 3224 // 3225 3226 3227 // function_table - pre-checked for NULL 3228 jvmtiError 3229 JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) { 3230 // Copy jni function table at safepoint. 3231 VM_JNIFunctionTableCopier copier(function_table); 3232 VMThread::execute(&copier); 3233 3234 return JVMTI_ERROR_NONE; 3235 } /* end SetJNIFunctionTable */ 3236 3237 3238 // function_table - pre-checked for NULL 3239 jvmtiError 3240 JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) { 3241 *function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface)); 3242 if (*function_table == NULL) 3243 return JVMTI_ERROR_OUT_OF_MEMORY; 3244 memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface)); 3245 return JVMTI_ERROR_NONE; 3246 } /* end GetJNIFunctionTable */ 3247 3248 3249 // 3250 // Event Management functions 3251 // 3252 3253 jvmtiError 3254 JvmtiEnv::GenerateEvents(jvmtiEvent event_type) { 3255 // can only generate two event types 3256 if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD && 3257 event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) { 3258 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 3259 } 3260 3261 // for compiled_method_load events we must check that the environment 3262 // has the can_generate_compiled_method_load_events capability. 3263 if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) { 3264 if (get_capabilities()->can_generate_compiled_method_load_events == 0) { 3265 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY; 3266 } 3267 return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this); 3268 } else { 3269 return JvmtiCodeBlobEvents::generate_dynamic_code_events(this); 3270 } 3271 3272 } /* end GenerateEvents */ 3273 3274 3275 // 3276 // Extension Mechanism functions 3277 // 3278 3279 // extension_count_ptr - pre-checked for NULL 3280 // extensions - pre-checked for NULL 3281 jvmtiError 3282 JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) { 3283 return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions); 3284 } /* end GetExtensionFunctions */ 3285 3286 3287 // extension_count_ptr - pre-checked for NULL 3288 // extensions - pre-checked for NULL 3289 jvmtiError 3290 JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) { 3291 return JvmtiExtensions::get_events(this, extension_count_ptr, extensions); 3292 } /* end GetExtensionEvents */ 3293 3294 3295 // callback - NULL is a valid value, must be checked 3296 jvmtiError 3297 JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) { 3298 return JvmtiExtensions::set_event_callback(this, extension_event_index, callback); 3299 } /* end SetExtensionEventCallback */ 3300 3301 // 3302 // Timers functions 3303 // 3304 3305 // info_ptr - pre-checked for NULL 3306 jvmtiError 3307 JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) { 3308 os::current_thread_cpu_time_info(info_ptr); 3309 return JVMTI_ERROR_NONE; 3310 } /* end GetCurrentThreadCpuTimerInfo */ 3311 3312 3313 // nanos_ptr - pre-checked for NULL 3314 jvmtiError 3315 JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) { 3316 *nanos_ptr = os::current_thread_cpu_time(); 3317 return JVMTI_ERROR_NONE; 3318 } /* end GetCurrentThreadCpuTime */ 3319 3320 3321 // info_ptr - pre-checked for NULL 3322 jvmtiError 3323 JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) { 3324 os::thread_cpu_time_info(info_ptr); 3325 return JVMTI_ERROR_NONE; 3326 } /* end GetThreadCpuTimerInfo */ 3327 3328 3329 // Threads_lock NOT held, java_thread not protected by lock 3330 // java_thread - pre-checked 3331 // nanos_ptr - pre-checked for NULL 3332 jvmtiError 3333 JvmtiEnv::GetThreadCpuTime(JavaThread* java_thread, jlong* nanos_ptr) { 3334 *nanos_ptr = os::thread_cpu_time(java_thread); 3335 return JVMTI_ERROR_NONE; 3336 } /* end GetThreadCpuTime */ 3337 3338 3339 // info_ptr - pre-checked for NULL 3340 jvmtiError 3341 JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) { 3342 os::javaTimeNanos_info(info_ptr); 3343 return JVMTI_ERROR_NONE; 3344 } /* end GetTimerInfo */ 3345 3346 3347 // nanos_ptr - pre-checked for NULL 3348 jvmtiError 3349 JvmtiEnv::GetTime(jlong* nanos_ptr) { 3350 *nanos_ptr = os::javaTimeNanos(); 3351 return JVMTI_ERROR_NONE; 3352 } /* end GetTime */ 3353 3354 3355 // processor_count_ptr - pre-checked for NULL 3356 jvmtiError 3357 JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) { 3358 *processor_count_ptr = os::active_processor_count(); 3359 return JVMTI_ERROR_NONE; 3360 } /* end GetAvailableProcessors */ 3361 3362 // 3363 // System Properties functions 3364 // 3365 3366 // count_ptr - pre-checked for NULL 3367 // property_ptr - pre-checked for NULL 3368 jvmtiError 3369 JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) { 3370 jvmtiError err = JVMTI_ERROR_NONE; 3371 3372 *count_ptr = Arguments::PropertyList_count(Arguments::system_properties()); 3373 3374 err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr); 3375 if (err != JVMTI_ERROR_NONE) { 3376 return err; 3377 } 3378 int i = 0 ; 3379 for (SystemProperty* p = Arguments::system_properties(); p != NULL && i < *count_ptr; p = p->next(), i++) { 3380 const char *key = p->key(); 3381 char **tmp_value = *property_ptr+i; 3382 err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value); 3383 if (err == JVMTI_ERROR_NONE) { 3384 strcpy(*tmp_value, key); 3385 } else { 3386 // clean up previously allocated memory. 3387 for (int j=0; j<i; j++) { 3388 Deallocate((unsigned char*)*property_ptr+j); 3389 } 3390 Deallocate((unsigned char*)property_ptr); 3391 break; 3392 } 3393 } 3394 return err; 3395 } /* end GetSystemProperties */ 3396 3397 3398 // property - pre-checked for NULL 3399 // value_ptr - pre-checked for NULL 3400 jvmtiError 3401 JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) { 3402 jvmtiError err = JVMTI_ERROR_NONE; 3403 const char *value; 3404 3405 value = Arguments::PropertyList_get_value(Arguments::system_properties(), property); 3406 if (value == NULL) { 3407 err = JVMTI_ERROR_NOT_AVAILABLE; 3408 } else { 3409 err = allocate((strlen(value)+1) * sizeof(char), (unsigned char **)value_ptr); 3410 if (err == JVMTI_ERROR_NONE) { 3411 strcpy(*value_ptr, value); 3412 } 3413 } 3414 return err; 3415 } /* end GetSystemProperty */ 3416 3417 3418 // property - pre-checked for NULL 3419 // value - NULL is a valid value, must be checked 3420 jvmtiError 3421 JvmtiEnv::SetSystemProperty(const char* property, const char* value) { 3422 jvmtiError err =JVMTI_ERROR_NOT_AVAILABLE; 3423 3424 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 3425 if (strcmp(property, p->key()) == 0) { 3426 if (p->set_value((char *)value)) { 3427 err = JVMTI_ERROR_NONE; 3428 } 3429 } 3430 } 3431 return err; 3432 } /* end SetSystemProperty */ 3433 3434 #endif // !JVMTI_KERNEL