jvmtiEnv.cpp revision 10420:c558850fac57
1/* 2 * Copyright (c) 2003, 2016, 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/classLoaderExt.hpp" 27#include "classfile/systemDictionary.hpp" 28#include "classfile/vmSymbols.hpp" 29#include "interpreter/bytecodeStream.hpp" 30#include "interpreter/interpreter.hpp" 31#include "jvmtifiles/jvmtiEnv.hpp" 32#include "logging/log.hpp" 33#include "logging/logConfiguration.hpp" 34#include "memory/resourceArea.hpp" 35#include "memory/universe.inline.hpp" 36#include "oops/instanceKlass.hpp" 37#include "oops/objArrayOop.inline.hpp" 38#include "oops/oop.inline.hpp" 39#include "prims/jniCheck.hpp" 40#include "prims/jvm_misc.hpp" 41#include "prims/jvmtiAgentThread.hpp" 42#include "prims/jvmtiClassFileReconstituter.hpp" 43#include "prims/jvmtiCodeBlobEvents.hpp" 44#include "prims/jvmtiExtensions.hpp" 45#include "prims/jvmtiGetLoadedClasses.hpp" 46#include "prims/jvmtiImpl.hpp" 47#include "prims/jvmtiManageCapabilities.hpp" 48#include "prims/jvmtiRawMonitor.hpp" 49#include "prims/jvmtiRedefineClasses.hpp" 50#include "prims/jvmtiTagMap.hpp" 51#include "prims/jvmtiThreadState.inline.hpp" 52#include "prims/jvmtiUtil.hpp" 53#include "runtime/arguments.hpp" 54#include "runtime/deoptimization.hpp" 55#include "runtime/interfaceSupport.hpp" 56#include "runtime/javaCalls.hpp" 57#include "runtime/jfieldIDWorkaround.hpp" 58#include "runtime/osThread.hpp" 59#include "runtime/reflectionUtils.hpp" 60#include "runtime/signature.hpp" 61#include "runtime/thread.inline.hpp" 62#include "runtime/vframe.hpp" 63#include "runtime/vmThread.hpp" 64#include "services/threadService.hpp" 65#include "utilities/exceptions.hpp" 66#include "utilities/preserveException.hpp" 67 68 69#define FIXLATER 0 // REMOVE this when completed. 70 71 // FIXLATER: hook into JvmtiTrace 72#define TraceJVMTICalls false 73 74JvmtiEnv::JvmtiEnv(jint version) : JvmtiEnvBase(version) { 75} 76 77JvmtiEnv::~JvmtiEnv() { 78} 79 80JvmtiEnv* 81JvmtiEnv::create_a_jvmti(jint version) { 82 return new JvmtiEnv(version); 83} 84 85// VM operation class to copy jni function table at safepoint. 86// More than one java threads or jvmti agents may be reading/ 87// modifying jni function tables. To reduce the risk of bad 88// interaction b/w these threads it is copied at safepoint. 89class VM_JNIFunctionTableCopier : public VM_Operation { 90 private: 91 const struct JNINativeInterface_ *_function_table; 92 public: 93 VM_JNIFunctionTableCopier(const struct JNINativeInterface_ *func_tbl) { 94 _function_table = func_tbl; 95 }; 96 97 VMOp_Type type() const { return VMOp_JNIFunctionTableCopier; } 98 void doit() { 99 copy_jni_function_table(_function_table); 100 }; 101}; 102 103// 104// Do not change the "prefix" marker below, everything above it is copied 105// unchanged into the filled stub, everything below is controlled by the 106// stub filler (only method bodies are carried forward, and then only for 107// functionality still in the spec). 108// 109// end file prefix 110 111 // 112 // Memory Management functions 113 // 114 115// mem_ptr - pre-checked for NULL 116jvmtiError 117JvmtiEnv::Allocate(jlong size, unsigned char** mem_ptr) { 118 return allocate(size, mem_ptr); 119} /* end Allocate */ 120 121 122// mem - NULL is a valid value, must be checked 123jvmtiError 124JvmtiEnv::Deallocate(unsigned char* mem) { 125 return deallocate(mem); 126} /* end Deallocate */ 127 128// Threads_lock NOT held, java_thread not protected by lock 129// java_thread - pre-checked 130// data - NULL is a valid value, must be checked 131jvmtiError 132JvmtiEnv::SetThreadLocalStorage(JavaThread* java_thread, const void* data) { 133 JvmtiThreadState* state = java_thread->jvmti_thread_state(); 134 if (state == NULL) { 135 if (data == NULL) { 136 // leaving state unset same as data set to NULL 137 return JVMTI_ERROR_NONE; 138 } 139 // otherwise, create the state 140 state = JvmtiThreadState::state_for(java_thread); 141 if (state == NULL) { 142 return JVMTI_ERROR_THREAD_NOT_ALIVE; 143 } 144 } 145 state->env_thread_state(this)->set_agent_thread_local_storage_data((void*)data); 146 return JVMTI_ERROR_NONE; 147} /* end SetThreadLocalStorage */ 148 149 150// Threads_lock NOT held 151// thread - NOT pre-checked 152// data_ptr - pre-checked for NULL 153jvmtiError 154JvmtiEnv::GetThreadLocalStorage(jthread thread, void** data_ptr) { 155 JavaThread* current_thread = JavaThread::current(); 156 if (thread == NULL) { 157 JvmtiThreadState* state = current_thread->jvmti_thread_state(); 158 *data_ptr = (state == NULL) ? NULL : 159 state->env_thread_state(this)->get_agent_thread_local_storage_data(); 160 } else { 161 162 // jvmti_GetThreadLocalStorage is "in native" and doesn't transition 163 // the thread to _thread_in_vm. However, when the TLS for a thread 164 // other than the current thread is required we need to transition 165 // from native so as to resolve the jthread. 166 167 ThreadInVMfromNative __tiv(current_thread); 168 VM_ENTRY_BASE(jvmtiError, JvmtiEnv::GetThreadLocalStorage , current_thread) 169 debug_only(VMNativeEntryWrapper __vew;) 170 171 oop thread_oop = JNIHandles::resolve_external_guard(thread); 172 if (thread_oop == NULL) { 173 return JVMTI_ERROR_INVALID_THREAD; 174 } 175 if (!thread_oop->is_a(SystemDictionary::Thread_klass())) { 176 return JVMTI_ERROR_INVALID_THREAD; 177 } 178 JavaThread* java_thread = java_lang_Thread::thread(thread_oop); 179 if (java_thread == NULL) { 180 return JVMTI_ERROR_THREAD_NOT_ALIVE; 181 } 182 JvmtiThreadState* state = java_thread->jvmti_thread_state(); 183 *data_ptr = (state == NULL) ? NULL : 184 state->env_thread_state(this)->get_agent_thread_local_storage_data(); 185 } 186 return JVMTI_ERROR_NONE; 187} /* end GetThreadLocalStorage */ 188 189 // 190 // Module functions 191 // 192 193// module_count_ptr - pre-checked for NULL 194// modules_ptr - pre-checked for NULL 195jvmtiError 196JvmtiEnv::GetAllModules(jint* module_count_ptr, jobject** modules_ptr) { 197 JvmtiModuleClosure jmc; 198 199 return jmc.get_all_modules(this, module_count_ptr, modules_ptr); 200} /* end GetAllModules */ 201 202 203 // 204 // Class functions 205 // 206 207// class_count_ptr - pre-checked for NULL 208// classes_ptr - pre-checked for NULL 209jvmtiError 210JvmtiEnv::GetLoadedClasses(jint* class_count_ptr, jclass** classes_ptr) { 211 return JvmtiGetLoadedClasses::getLoadedClasses(this, class_count_ptr, classes_ptr); 212} /* end GetLoadedClasses */ 213 214 215// initiating_loader - NULL is a valid value, must be checked 216// class_count_ptr - pre-checked for NULL 217// classes_ptr - pre-checked for NULL 218jvmtiError 219JvmtiEnv::GetClassLoaderClasses(jobject initiating_loader, jint* class_count_ptr, jclass** classes_ptr) { 220 return JvmtiGetLoadedClasses::getClassLoaderClasses(this, initiating_loader, 221 class_count_ptr, classes_ptr); 222} /* end GetClassLoaderClasses */ 223 224// k_mirror - may be primitive, this must be checked 225// is_modifiable_class_ptr - pre-checked for NULL 226jvmtiError 227JvmtiEnv::IsModifiableClass(oop k_mirror, jboolean* is_modifiable_class_ptr) { 228 *is_modifiable_class_ptr = VM_RedefineClasses::is_modifiable_class(k_mirror)? 229 JNI_TRUE : JNI_FALSE; 230 return JVMTI_ERROR_NONE; 231} /* end IsModifiableClass */ 232 233// class_count - pre-checked to be greater than or equal to 0 234// classes - pre-checked for NULL 235jvmtiError 236JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) { 237//TODO: add locking 238 239 int index; 240 JavaThread* current_thread = JavaThread::current(); 241 ResourceMark rm(current_thread); 242 243 jvmtiClassDefinition* class_definitions = 244 NEW_RESOURCE_ARRAY(jvmtiClassDefinition, class_count); 245 NULL_CHECK(class_definitions, JVMTI_ERROR_OUT_OF_MEMORY); 246 247 for (index = 0; index < class_count; index++) { 248 HandleMark hm(current_thread); 249 250 jclass jcls = classes[index]; 251 oop k_mirror = JNIHandles::resolve_external_guard(jcls); 252 if (k_mirror == NULL) { 253 return JVMTI_ERROR_INVALID_CLASS; 254 } 255 if (!k_mirror->is_a(SystemDictionary::Class_klass())) { 256 return JVMTI_ERROR_INVALID_CLASS; 257 } 258 259 if (java_lang_Class::is_primitive(k_mirror)) { 260 return JVMTI_ERROR_UNMODIFIABLE_CLASS; 261 } 262 263 Klass* k_oop = java_lang_Class::as_Klass(k_mirror); 264 KlassHandle klass(current_thread, k_oop); 265 266 jint status = klass->jvmti_class_status(); 267 if (status & (JVMTI_CLASS_STATUS_ERROR)) { 268 return JVMTI_ERROR_INVALID_CLASS; 269 } 270 if (status & (JVMTI_CLASS_STATUS_ARRAY)) { 271 return JVMTI_ERROR_UNMODIFIABLE_CLASS; 272 } 273 274 instanceKlassHandle ikh(current_thread, k_oop); 275 if (ikh->get_cached_class_file_bytes() == NULL) { 276 // Not cached, we need to reconstitute the class file from the 277 // VM representation. We don't attach the reconstituted class 278 // bytes to the InstanceKlass here because they have not been 279 // validated and we're not at a safepoint. 280 JvmtiClassFileReconstituter reconstituter(ikh); 281 if (reconstituter.get_error() != JVMTI_ERROR_NONE) { 282 return reconstituter.get_error(); 283 } 284 285 class_definitions[index].class_byte_count = (jint)reconstituter.class_file_size(); 286 class_definitions[index].class_bytes = (unsigned char*) 287 reconstituter.class_file_bytes(); 288 } else { 289 // it is cached, get it from the cache 290 class_definitions[index].class_byte_count = ikh->get_cached_class_file_len(); 291 class_definitions[index].class_bytes = ikh->get_cached_class_file_bytes(); 292 } 293 class_definitions[index].klass = jcls; 294 } 295 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform); 296 VMThread::execute(&op); 297 return (op.check_error()); 298} /* end RetransformClasses */ 299 300 301// class_count - pre-checked to be greater than or equal to 0 302// class_definitions - pre-checked for NULL 303jvmtiError 304JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_definitions) { 305//TODO: add locking 306 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine); 307 VMThread::execute(&op); 308 return (op.check_error()); 309} /* end RedefineClasses */ 310 311 312 // 313 // Object functions 314 // 315 316// size_ptr - pre-checked for NULL 317jvmtiError 318JvmtiEnv::GetObjectSize(jobject object, jlong* size_ptr) { 319 oop mirror = JNIHandles::resolve_external_guard(object); 320 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT); 321 322 if (mirror->klass() == SystemDictionary::Class_klass() && 323 !java_lang_Class::is_primitive(mirror)) { 324 Klass* k = java_lang_Class::as_Klass(mirror); 325 assert(k != NULL, "class for non-primitive mirror must exist"); 326 *size_ptr = (jlong)k->size() * wordSize; 327 } else { 328 *size_ptr = (jlong)mirror->size() * wordSize; 329 } 330 return JVMTI_ERROR_NONE; 331} /* end GetObjectSize */ 332 333 // 334 // Method functions 335 // 336 337// prefix - NULL is a valid value, must be checked 338jvmtiError 339JvmtiEnv::SetNativeMethodPrefix(const char* prefix) { 340 return prefix == NULL? 341 SetNativeMethodPrefixes(0, NULL) : 342 SetNativeMethodPrefixes(1, (char**)&prefix); 343} /* end SetNativeMethodPrefix */ 344 345 346// prefix_count - pre-checked to be greater than or equal to 0 347// prefixes - pre-checked for NULL 348jvmtiError 349JvmtiEnv::SetNativeMethodPrefixes(jint prefix_count, char** prefixes) { 350 // Have to grab JVMTI thread state lock to be sure that some thread 351 // isn't accessing the prefixes at the same time we are setting them. 352 // No locks during VM bring-up. 353 if (Threads::number_of_threads() == 0) { 354 return set_native_method_prefixes(prefix_count, prefixes); 355 } else { 356 MutexLocker mu(JvmtiThreadState_lock); 357 return set_native_method_prefixes(prefix_count, prefixes); 358 } 359} /* end SetNativeMethodPrefixes */ 360 361 // 362 // Event Management functions 363 // 364 365// callbacks - NULL is a valid value, must be checked 366// size_of_callbacks - pre-checked to be greater than or equal to 0 367jvmtiError 368JvmtiEnv::SetEventCallbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks) { 369 JvmtiEventController::set_event_callbacks(this, callbacks, size_of_callbacks); 370 return JVMTI_ERROR_NONE; 371} /* end SetEventCallbacks */ 372 373 374// event_thread - NULL is a valid value, must be checked 375jvmtiError 376JvmtiEnv::SetEventNotificationMode(jvmtiEventMode mode, jvmtiEvent event_type, jthread event_thread, ...) { 377 JavaThread* java_thread = NULL; 378 if (event_thread != NULL) { 379 oop thread_oop = JNIHandles::resolve_external_guard(event_thread); 380 if (thread_oop == NULL) { 381 return JVMTI_ERROR_INVALID_THREAD; 382 } 383 if (!thread_oop->is_a(SystemDictionary::Thread_klass())) { 384 return JVMTI_ERROR_INVALID_THREAD; 385 } 386 java_thread = java_lang_Thread::thread(thread_oop); 387 if (java_thread == NULL) { 388 return JVMTI_ERROR_THREAD_NOT_ALIVE; 389 } 390 } 391 392 // event_type must be valid 393 if (!JvmtiEventController::is_valid_event_type(event_type)) { 394 return JVMTI_ERROR_INVALID_EVENT_TYPE; 395 } 396 397 // global events cannot be controlled at thread level. 398 if (java_thread != NULL && JvmtiEventController::is_global_event(event_type)) { 399 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 400 } 401 402 bool enabled = (mode == JVMTI_ENABLE); 403 404 // assure that needed capabilities are present 405 if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) { 406 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY; 407 } 408 409 if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) { 410 record_class_file_load_hook_enabled(); 411 } 412 JvmtiEventController::set_user_enabled(this, java_thread, event_type, enabled); 413 414 return JVMTI_ERROR_NONE; 415} /* end SetEventNotificationMode */ 416 417 // 418 // Capability functions 419 // 420 421// capabilities_ptr - pre-checked for NULL 422jvmtiError 423JvmtiEnv::GetPotentialCapabilities(jvmtiCapabilities* capabilities_ptr) { 424 JvmtiManageCapabilities::get_potential_capabilities(get_capabilities(), 425 get_prohibited_capabilities(), 426 capabilities_ptr); 427 return JVMTI_ERROR_NONE; 428} /* end GetPotentialCapabilities */ 429 430 431// capabilities_ptr - pre-checked for NULL 432jvmtiError 433JvmtiEnv::AddCapabilities(const jvmtiCapabilities* capabilities_ptr) { 434 return JvmtiManageCapabilities::add_capabilities(get_capabilities(), 435 get_prohibited_capabilities(), 436 capabilities_ptr, 437 get_capabilities()); 438} /* end AddCapabilities */ 439 440 441// capabilities_ptr - pre-checked for NULL 442jvmtiError 443JvmtiEnv::RelinquishCapabilities(const jvmtiCapabilities* capabilities_ptr) { 444 JvmtiManageCapabilities::relinquish_capabilities(get_capabilities(), capabilities_ptr, get_capabilities()); 445 return JVMTI_ERROR_NONE; 446} /* end RelinquishCapabilities */ 447 448 449// capabilities_ptr - pre-checked for NULL 450jvmtiError 451JvmtiEnv::GetCapabilities(jvmtiCapabilities* capabilities_ptr) { 452 JvmtiManageCapabilities::copy_capabilities(get_capabilities(), capabilities_ptr); 453 return JVMTI_ERROR_NONE; 454} /* end GetCapabilities */ 455 456 // 457 // Class Loader Search functions 458 // 459 460// segment - pre-checked for NULL 461jvmtiError 462JvmtiEnv::AddToBootstrapClassLoaderSearch(const char* segment) { 463 jvmtiPhase phase = get_phase(); 464 if (phase == JVMTI_PHASE_ONLOAD) { 465 Arguments::append_sysclasspath(segment); 466 return JVMTI_ERROR_NONE; 467 } else if (use_version_1_0_semantics()) { 468 // This JvmtiEnv requested version 1.0 semantics and this function 469 // is only allowed in the ONLOAD phase in version 1.0 so we need to 470 // return an error here. 471 return JVMTI_ERROR_WRONG_PHASE; 472 } else if (phase == JVMTI_PHASE_LIVE) { 473 // The phase is checked by the wrapper that called this function, 474 // but this thread could be racing with the thread that is 475 // terminating the VM so we check one more time. 476 477 // create the zip entry 478 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment); 479 if (zip_entry == NULL) { 480 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 481 } 482 483 // lock the loader 484 Thread* thread = Thread::current(); 485 HandleMark hm; 486 Handle loader_lock = Handle(thread, SystemDictionary::system_loader_lock()); 487 488 ObjectLocker ol(loader_lock, thread); 489 490 // add the jar file to the bootclasspath 491 log_info(classload)("opened: %s", zip_entry->name()); 492 ClassLoaderExt::append_boot_classpath(zip_entry); 493 return JVMTI_ERROR_NONE; 494 } else { 495 return JVMTI_ERROR_WRONG_PHASE; 496 } 497 498} /* end AddToBootstrapClassLoaderSearch */ 499 500 501// segment - pre-checked for NULL 502jvmtiError 503JvmtiEnv::AddToSystemClassLoaderSearch(const char* segment) { 504 jvmtiPhase phase = get_phase(); 505 506 if (phase == JVMTI_PHASE_ONLOAD) { 507 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 508 if (strcmp("java.class.path", p->key()) == 0) { 509 p->append_value(segment); 510 break; 511 } 512 } 513 return JVMTI_ERROR_NONE; 514 } else if (phase == JVMTI_PHASE_LIVE) { 515 // The phase is checked by the wrapper that called this function, 516 // but this thread could be racing with the thread that is 517 // terminating the VM so we check one more time. 518 HandleMark hm; 519 520 // create the zip entry (which will open the zip file and hence 521 // check that the segment is indeed a zip file). 522 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment); 523 if (zip_entry == NULL) { 524 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 525 } 526 delete zip_entry; // no longer needed 527 528 // lock the loader 529 Thread* THREAD = Thread::current(); 530 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader()); 531 532 ObjectLocker ol(loader, THREAD); 533 534 // need the path as java.lang.String 535 Handle path = java_lang_String::create_from_platform_dependent_str(segment, THREAD); 536 if (HAS_PENDING_EXCEPTION) { 537 CLEAR_PENDING_EXCEPTION; 538 return JVMTI_ERROR_INTERNAL; 539 } 540 541 instanceKlassHandle loader_ik(THREAD, loader->klass()); 542 543 // Invoke the appendToClassPathForInstrumentation method - if the method 544 // is not found it means the loader doesn't support adding to the class path 545 // in the live phase. 546 { 547 JavaValue res(T_VOID); 548 JavaCalls::call_special(&res, 549 loader, 550 loader_ik, 551 vmSymbols::appendToClassPathForInstrumentation_name(), 552 vmSymbols::appendToClassPathForInstrumentation_signature(), 553 path, 554 THREAD); 555 if (HAS_PENDING_EXCEPTION) { 556 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); 557 CLEAR_PENDING_EXCEPTION; 558 559 if (ex_name == vmSymbols::java_lang_NoSuchMethodError()) { 560 return JVMTI_ERROR_CLASS_LOADER_UNSUPPORTED; 561 } else { 562 return JVMTI_ERROR_INTERNAL; 563 } 564 } 565 } 566 567 return JVMTI_ERROR_NONE; 568 } else { 569 return JVMTI_ERROR_WRONG_PHASE; 570 } 571} /* end AddToSystemClassLoaderSearch */ 572 573 // 574 // General functions 575 // 576 577// phase_ptr - pre-checked for NULL 578jvmtiError 579JvmtiEnv::GetPhase(jvmtiPhase* phase_ptr) { 580 *phase_ptr = phase(); 581 return JVMTI_ERROR_NONE; 582} /* end GetPhase */ 583 584 585jvmtiError 586JvmtiEnv::DisposeEnvironment() { 587 dispose(); 588 return JVMTI_ERROR_NONE; 589} /* end DisposeEnvironment */ 590 591 592// data - NULL is a valid value, must be checked 593jvmtiError 594JvmtiEnv::SetEnvironmentLocalStorage(const void* data) { 595 set_env_local_storage(data); 596 return JVMTI_ERROR_NONE; 597} /* end SetEnvironmentLocalStorage */ 598 599 600// data_ptr - pre-checked for NULL 601jvmtiError 602JvmtiEnv::GetEnvironmentLocalStorage(void** data_ptr) { 603 *data_ptr = (void*)get_env_local_storage(); 604 return JVMTI_ERROR_NONE; 605} /* end GetEnvironmentLocalStorage */ 606 607// version_ptr - pre-checked for NULL 608jvmtiError 609JvmtiEnv::GetVersionNumber(jint* version_ptr) { 610 *version_ptr = JVMTI_VERSION; 611 return JVMTI_ERROR_NONE; 612} /* end GetVersionNumber */ 613 614 615// name_ptr - pre-checked for NULL 616jvmtiError 617JvmtiEnv::GetErrorName(jvmtiError error, char** name_ptr) { 618 if (error < JVMTI_ERROR_NONE || error > JVMTI_ERROR_MAX) { 619 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 620 } 621 const char *name = JvmtiUtil::error_name(error); 622 if (name == NULL) { 623 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 624 } 625 size_t len = strlen(name) + 1; 626 jvmtiError err = allocate(len, (unsigned char**)name_ptr); 627 if (err == JVMTI_ERROR_NONE) { 628 memcpy(*name_ptr, name, len); 629 } 630 return err; 631} /* end GetErrorName */ 632 633 634jvmtiError 635JvmtiEnv::SetVerboseFlag(jvmtiVerboseFlag flag, jboolean value) { 636 switch (flag) { 637 case JVMTI_VERBOSE_OTHER: 638 // ignore 639 break; 640 case JVMTI_VERBOSE_CLASS: 641 if (value == 0) { 642 LogConfiguration::parse_log_arguments("stdout", "classunload=off", NULL, NULL, NULL); 643 LogConfiguration::parse_log_arguments("stdout", "classload=off", NULL, NULL, NULL); 644 } else { 645 LogConfiguration::parse_log_arguments("stdout", "classload=info", NULL, NULL, NULL); 646 LogConfiguration::parse_log_arguments("stdout", "classunload=info", NULL, NULL, NULL); 647 } 648 break; 649 case JVMTI_VERBOSE_GC: 650 if (value == 0) { 651 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(gc)); 652 } else { 653 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 654 } 655 break; 656 case JVMTI_VERBOSE_JNI: 657 PrintJNIResolving = value != 0; 658 break; 659 default: 660 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 661 }; 662 return JVMTI_ERROR_NONE; 663} /* end SetVerboseFlag */ 664 665 666// format_ptr - pre-checked for NULL 667jvmtiError 668JvmtiEnv::GetJLocationFormat(jvmtiJlocationFormat* format_ptr) { 669 *format_ptr = JVMTI_JLOCATION_JVMBCI; 670 return JVMTI_ERROR_NONE; 671} /* end GetJLocationFormat */ 672 673 // 674 // Thread functions 675 // 676 677// Threads_lock NOT held 678// thread - NOT pre-checked 679// thread_state_ptr - pre-checked for NULL 680jvmtiError 681JvmtiEnv::GetThreadState(jthread thread, jint* thread_state_ptr) { 682 jint state; 683 oop thread_oop; 684 JavaThread* thr; 685 686 if (thread == NULL) { 687 thread_oop = JavaThread::current()->threadObj(); 688 } else { 689 thread_oop = JNIHandles::resolve_external_guard(thread); 690 } 691 692 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) { 693 return JVMTI_ERROR_INVALID_THREAD; 694 } 695 696 // get most state bits 697 state = (jint)java_lang_Thread::get_thread_status(thread_oop); 698 699 // add more state bits 700 thr = java_lang_Thread::thread(thread_oop); 701 if (thr != NULL) { 702 JavaThreadState jts = thr->thread_state(); 703 704 if (thr->is_being_ext_suspended()) { 705 state |= JVMTI_THREAD_STATE_SUSPENDED; 706 } 707 if (jts == _thread_in_native) { 708 state |= JVMTI_THREAD_STATE_IN_NATIVE; 709 } 710 OSThread* osThread = thr->osthread(); 711 if (osThread != NULL && osThread->interrupted()) { 712 state |= JVMTI_THREAD_STATE_INTERRUPTED; 713 } 714 } 715 716 *thread_state_ptr = state; 717 return JVMTI_ERROR_NONE; 718} /* end GetThreadState */ 719 720 721// thread_ptr - pre-checked for NULL 722jvmtiError 723JvmtiEnv::GetCurrentThread(jthread* thread_ptr) { 724 JavaThread* current_thread = JavaThread::current(); 725 *thread_ptr = (jthread)JNIHandles::make_local(current_thread, current_thread->threadObj()); 726 return JVMTI_ERROR_NONE; 727} /* end GetCurrentThread */ 728 729 730// threads_count_ptr - pre-checked for NULL 731// threads_ptr - pre-checked for NULL 732jvmtiError 733JvmtiEnv::GetAllThreads(jint* threads_count_ptr, jthread** threads_ptr) { 734 int nthreads = 0; 735 Handle *thread_objs = NULL; 736 ResourceMark rm; 737 HandleMark hm; 738 739 // enumerate threads (including agent threads) 740 ThreadsListEnumerator tle(Thread::current(), true); 741 nthreads = tle.num_threads(); 742 *threads_count_ptr = nthreads; 743 744 if (nthreads == 0) { 745 *threads_ptr = NULL; 746 return JVMTI_ERROR_NONE; 747 } 748 749 thread_objs = NEW_RESOURCE_ARRAY(Handle, nthreads); 750 NULL_CHECK(thread_objs, JVMTI_ERROR_OUT_OF_MEMORY); 751 752 for (int i=0; i < nthreads; i++) { 753 thread_objs[i] = Handle(tle.get_threadObj(i)); 754 } 755 756 // have to make global handles outside of Threads_lock 757 jthread *jthreads = new_jthreadArray(nthreads, thread_objs); 758 NULL_CHECK(jthreads, JVMTI_ERROR_OUT_OF_MEMORY); 759 760 *threads_ptr = jthreads; 761 return JVMTI_ERROR_NONE; 762} /* end GetAllThreads */ 763 764 765// Threads_lock NOT held, java_thread not protected by lock 766// java_thread - pre-checked 767jvmtiError 768JvmtiEnv::SuspendThread(JavaThread* java_thread) { 769 // don't allow hidden thread suspend request. 770 if (java_thread->is_hidden_from_external_view()) { 771 return (JVMTI_ERROR_NONE); 772 } 773 774 { 775 MutexLockerEx ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag); 776 if (java_thread->is_external_suspend()) { 777 // don't allow nested external suspend requests. 778 return (JVMTI_ERROR_THREAD_SUSPENDED); 779 } 780 if (java_thread->is_exiting()) { // thread is in the process of exiting 781 return (JVMTI_ERROR_THREAD_NOT_ALIVE); 782 } 783 java_thread->set_external_suspend(); 784 } 785 786 if (!JvmtiSuspendControl::suspend(java_thread)) { 787 // the thread was in the process of exiting 788 return (JVMTI_ERROR_THREAD_NOT_ALIVE); 789 } 790 return JVMTI_ERROR_NONE; 791} /* end SuspendThread */ 792 793 794// request_count - pre-checked to be greater than or equal to 0 795// request_list - pre-checked for NULL 796// results - pre-checked for NULL 797jvmtiError 798JvmtiEnv::SuspendThreadList(jint request_count, const jthread* request_list, jvmtiError* results) { 799 int needSafepoint = 0; // > 0 if we need a safepoint 800 for (int i = 0; i < request_count; i++) { 801 JavaThread *java_thread = get_JavaThread(request_list[i]); 802 if (java_thread == NULL) { 803 results[i] = JVMTI_ERROR_INVALID_THREAD; 804 continue; 805 } 806 // the thread has not yet run or has exited (not on threads list) 807 if (java_thread->threadObj() == NULL) { 808 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE; 809 continue; 810 } 811 if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) { 812 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE; 813 continue; 814 } 815 // don't allow hidden thread suspend request. 816 if (java_thread->is_hidden_from_external_view()) { 817 results[i] = JVMTI_ERROR_NONE; // indicate successful suspend 818 continue; 819 } 820 821 { 822 MutexLockerEx ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag); 823 if (java_thread->is_external_suspend()) { 824 // don't allow nested external suspend requests. 825 results[i] = JVMTI_ERROR_THREAD_SUSPENDED; 826 continue; 827 } 828 if (java_thread->is_exiting()) { // thread is in the process of exiting 829 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE; 830 continue; 831 } 832 java_thread->set_external_suspend(); 833 } 834 if (java_thread->thread_state() == _thread_in_native) { 835 // We need to try and suspend native threads here. Threads in 836 // other states will self-suspend on their next transition. 837 if (!JvmtiSuspendControl::suspend(java_thread)) { 838 // The thread was in the process of exiting. Force another 839 // safepoint to make sure that this thread transitions. 840 needSafepoint++; 841 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE; 842 continue; 843 } 844 } else { 845 needSafepoint++; 846 } 847 results[i] = JVMTI_ERROR_NONE; // indicate successful suspend 848 } 849 if (needSafepoint > 0) { 850 VM_ForceSafepoint vfs; 851 VMThread::execute(&vfs); 852 } 853 // per-thread suspend results returned via results parameter 854 return JVMTI_ERROR_NONE; 855} /* end SuspendThreadList */ 856 857 858// Threads_lock NOT held, java_thread not protected by lock 859// java_thread - pre-checked 860jvmtiError 861JvmtiEnv::ResumeThread(JavaThread* java_thread) { 862 // don't allow hidden thread resume request. 863 if (java_thread->is_hidden_from_external_view()) { 864 return JVMTI_ERROR_NONE; 865 } 866 867 if (!java_thread->is_being_ext_suspended()) { 868 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; 869 } 870 871 if (!JvmtiSuspendControl::resume(java_thread)) { 872 return JVMTI_ERROR_INTERNAL; 873 } 874 return JVMTI_ERROR_NONE; 875} /* end ResumeThread */ 876 877 878// request_count - pre-checked to be greater than or equal to 0 879// request_list - pre-checked for NULL 880// results - pre-checked for NULL 881jvmtiError 882JvmtiEnv::ResumeThreadList(jint request_count, const jthread* request_list, jvmtiError* results) { 883 for (int i = 0; i < request_count; i++) { 884 JavaThread *java_thread = get_JavaThread(request_list[i]); 885 if (java_thread == NULL) { 886 results[i] = JVMTI_ERROR_INVALID_THREAD; 887 continue; 888 } 889 // don't allow hidden thread resume request. 890 if (java_thread->is_hidden_from_external_view()) { 891 results[i] = JVMTI_ERROR_NONE; // indicate successful resume 892 continue; 893 } 894 if (!java_thread->is_being_ext_suspended()) { 895 results[i] = JVMTI_ERROR_THREAD_NOT_SUSPENDED; 896 continue; 897 } 898 899 if (!JvmtiSuspendControl::resume(java_thread)) { 900 results[i] = JVMTI_ERROR_INTERNAL; 901 continue; 902 } 903 904 results[i] = JVMTI_ERROR_NONE; // indicate successful suspend 905 } 906 // per-thread resume results returned via results parameter 907 return JVMTI_ERROR_NONE; 908} /* end ResumeThreadList */ 909 910 911// Threads_lock NOT held, java_thread not protected by lock 912// java_thread - pre-checked 913jvmtiError 914JvmtiEnv::StopThread(JavaThread* java_thread, jobject exception) { 915 oop e = JNIHandles::resolve_external_guard(exception); 916 NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER); 917 918 JavaThread::send_async_exception(java_thread->threadObj(), e); 919 920 return JVMTI_ERROR_NONE; 921 922} /* end StopThread */ 923 924 925// Threads_lock NOT held 926// thread - NOT pre-checked 927jvmtiError 928JvmtiEnv::InterruptThread(jthread thread) { 929 oop thread_oop = JNIHandles::resolve_external_guard(thread); 930 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) 931 return JVMTI_ERROR_INVALID_THREAD; 932 933 JavaThread* current_thread = JavaThread::current(); 934 935 // Todo: this is a duplicate of JVM_Interrupt; share code in future 936 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate 937 MutexLockerEx ml(current_thread->threadObj() == thread_oop ? NULL : Threads_lock); 938 // We need to re-resolve the java_thread, since a GC might have happened during the 939 // acquire of the lock 940 941 JavaThread* java_thread = java_lang_Thread::thread(JNIHandles::resolve_external_guard(thread)); 942 NULL_CHECK(java_thread, JVMTI_ERROR_THREAD_NOT_ALIVE); 943 944 Thread::interrupt(java_thread); 945 946 return JVMTI_ERROR_NONE; 947} /* end InterruptThread */ 948 949 950// Threads_lock NOT held 951// thread - NOT pre-checked 952// info_ptr - pre-checked for NULL 953jvmtiError 954JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) { 955 ResourceMark rm; 956 HandleMark hm; 957 958 JavaThread* current_thread = JavaThread::current(); 959 960 // if thread is NULL the current thread is used 961 oop thread_oop; 962 if (thread == NULL) { 963 thread_oop = current_thread->threadObj(); 964 } else { 965 thread_oop = JNIHandles::resolve_external_guard(thread); 966 } 967 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) 968 return JVMTI_ERROR_INVALID_THREAD; 969 970 Handle thread_obj(current_thread, thread_oop); 971 Handle name; 972 ThreadPriority priority; 973 Handle thread_group; 974 Handle context_class_loader; 975 bool is_daemon; 976 977 { MutexLocker mu(Threads_lock); 978 979 name = Handle(current_thread, java_lang_Thread::name(thread_obj())); 980 priority = java_lang_Thread::priority(thread_obj()); 981 thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj())); 982 is_daemon = java_lang_Thread::is_daemon(thread_obj()); 983 984 oop loader = java_lang_Thread::context_class_loader(thread_obj()); 985 context_class_loader = Handle(current_thread, loader); 986 } 987 { const char *n; 988 989 if (name() != NULL) { 990 n = java_lang_String::as_utf8_string(name()); 991 } else { 992 n = UNICODE::as_utf8((jchar*) NULL, 0); 993 } 994 995 info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1); 996 if (info_ptr->name == NULL) 997 return JVMTI_ERROR_OUT_OF_MEMORY; 998 999 strcpy(info_ptr->name, n); 1000 } 1001 info_ptr->is_daemon = is_daemon; 1002 info_ptr->priority = priority; 1003 1004 info_ptr->context_class_loader = (context_class_loader.is_null()) ? NULL : 1005 jni_reference(context_class_loader); 1006 info_ptr->thread_group = jni_reference(thread_group); 1007 1008 return JVMTI_ERROR_NONE; 1009} /* end GetThreadInfo */ 1010 1011 1012// Threads_lock NOT held, java_thread not protected by lock 1013// java_thread - pre-checked 1014// owned_monitor_count_ptr - pre-checked for NULL 1015// owned_monitors_ptr - pre-checked for NULL 1016jvmtiError 1017JvmtiEnv::GetOwnedMonitorInfo(JavaThread* java_thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) { 1018 jvmtiError err = JVMTI_ERROR_NONE; 1019 JavaThread* calling_thread = JavaThread::current(); 1020 1021 // growable array of jvmti monitors info on the C-heap 1022 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list = 1023 new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, true); 1024 1025 // It is only safe to perform the direct operation on the current 1026 // thread. All other usage needs to use a vm-safepoint-op for safety. 1027 if (java_thread == calling_thread) { 1028 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list); 1029 } else { 1030 // JVMTI get monitors info at safepoint. Do not require target thread to 1031 // be suspended. 1032 VM_GetOwnedMonitorInfo op(this, calling_thread, java_thread, owned_monitors_list); 1033 VMThread::execute(&op); 1034 err = op.result(); 1035 } 1036 jint owned_monitor_count = owned_monitors_list->length(); 1037 if (err == JVMTI_ERROR_NONE) { 1038 if ((err = allocate(owned_monitor_count * sizeof(jobject *), 1039 (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) { 1040 // copy into the returned array 1041 for (int i = 0; i < owned_monitor_count; i++) { 1042 (*owned_monitors_ptr)[i] = 1043 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor; 1044 } 1045 *owned_monitor_count_ptr = owned_monitor_count; 1046 } 1047 } 1048 // clean up. 1049 for (int i = 0; i < owned_monitor_count; i++) { 1050 deallocate((unsigned char*)owned_monitors_list->at(i)); 1051 } 1052 delete owned_monitors_list; 1053 1054 return err; 1055} /* end GetOwnedMonitorInfo */ 1056 1057 1058// Threads_lock NOT held, java_thread not protected by lock 1059// java_thread - pre-checked 1060// monitor_info_count_ptr - pre-checked for NULL 1061// monitor_info_ptr - pre-checked for NULL 1062jvmtiError 1063JvmtiEnv::GetOwnedMonitorStackDepthInfo(JavaThread* java_thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) { 1064 jvmtiError err = JVMTI_ERROR_NONE; 1065 JavaThread* calling_thread = JavaThread::current(); 1066 1067 // growable array of jvmti monitors info on the C-heap 1068 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list = 1069 new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, true); 1070 1071 // It is only safe to perform the direct operation on the current 1072 // thread. All other usage needs to use a vm-safepoint-op for safety. 1073 if (java_thread == calling_thread) { 1074 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list); 1075 } else { 1076 // JVMTI get owned monitors info at safepoint. Do not require target thread to 1077 // be suspended. 1078 VM_GetOwnedMonitorInfo op(this, calling_thread, java_thread, owned_monitors_list); 1079 VMThread::execute(&op); 1080 err = op.result(); 1081 } 1082 1083 jint owned_monitor_count = owned_monitors_list->length(); 1084 if (err == JVMTI_ERROR_NONE) { 1085 if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo), 1086 (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) { 1087 // copy to output array. 1088 for (int i = 0; i < owned_monitor_count; i++) { 1089 (*monitor_info_ptr)[i].monitor = 1090 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor; 1091 (*monitor_info_ptr)[i].stack_depth = 1092 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth; 1093 } 1094 } 1095 *monitor_info_count_ptr = owned_monitor_count; 1096 } 1097 1098 // clean up. 1099 for (int i = 0; i < owned_monitor_count; i++) { 1100 deallocate((unsigned char*)owned_monitors_list->at(i)); 1101 } 1102 delete owned_monitors_list; 1103 1104 return err; 1105} /* end GetOwnedMonitorStackDepthInfo */ 1106 1107 1108// Threads_lock NOT held, java_thread not protected by lock 1109// java_thread - pre-checked 1110// monitor_ptr - pre-checked for NULL 1111jvmtiError 1112JvmtiEnv::GetCurrentContendedMonitor(JavaThread* java_thread, jobject* monitor_ptr) { 1113 jvmtiError err = JVMTI_ERROR_NONE; 1114 JavaThread* calling_thread = JavaThread::current(); 1115 1116 // It is only safe to perform the direct operation on the current 1117 // thread. All other usage needs to use a vm-safepoint-op for safety. 1118 if (java_thread == calling_thread) { 1119 err = get_current_contended_monitor(calling_thread, java_thread, monitor_ptr); 1120 } else { 1121 // get contended monitor information at safepoint. 1122 VM_GetCurrentContendedMonitor op(this, calling_thread, java_thread, monitor_ptr); 1123 VMThread::execute(&op); 1124 err = op.result(); 1125 } 1126 return err; 1127} /* end GetCurrentContendedMonitor */ 1128 1129 1130// Threads_lock NOT held 1131// thread - NOT pre-checked 1132// proc - pre-checked for NULL 1133// arg - NULL is a valid value, must be checked 1134jvmtiError 1135JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) { 1136 oop thread_oop = JNIHandles::resolve_external_guard(thread); 1137 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) { 1138 return JVMTI_ERROR_INVALID_THREAD; 1139 } 1140 if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) { 1141 return JVMTI_ERROR_INVALID_PRIORITY; 1142 } 1143 1144 //Thread-self 1145 JavaThread* current_thread = JavaThread::current(); 1146 1147 Handle thread_hndl(current_thread, thread_oop); 1148 { 1149 MutexLocker mu(Threads_lock); // grab Threads_lock 1150 1151 JvmtiAgentThread *new_thread = new JvmtiAgentThread(this, proc, arg); 1152 1153 // At this point it may be possible that no osthread was created for the 1154 // JavaThread due to lack of memory. 1155 if (new_thread == NULL || new_thread->osthread() == NULL) { 1156 if (new_thread) delete new_thread; 1157 return JVMTI_ERROR_OUT_OF_MEMORY; 1158 } 1159 1160 java_lang_Thread::set_thread(thread_hndl(), new_thread); 1161 java_lang_Thread::set_priority(thread_hndl(), (ThreadPriority)priority); 1162 java_lang_Thread::set_daemon(thread_hndl()); 1163 1164 new_thread->set_threadObj(thread_hndl()); 1165 Threads::add(new_thread); 1166 Thread::start(new_thread); 1167 } // unlock Threads_lock 1168 1169 return JVMTI_ERROR_NONE; 1170} /* end RunAgentThread */ 1171 1172 // 1173 // Thread Group functions 1174 // 1175 1176// group_count_ptr - pre-checked for NULL 1177// groups_ptr - pre-checked for NULL 1178jvmtiError 1179JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) { 1180 JavaThread* current_thread = JavaThread::current(); 1181 1182 // Only one top level thread group now. 1183 *group_count_ptr = 1; 1184 1185 // Allocate memory to store global-refs to the thread groups. 1186 // Assume this area is freed by caller. 1187 *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr)); 1188 1189 NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY); 1190 1191 // Convert oop to Handle, then convert Handle to global-ref. 1192 { 1193 HandleMark hm(current_thread); 1194 Handle system_thread_group(current_thread, Universe::system_thread_group()); 1195 *groups_ptr[0] = jni_reference(system_thread_group); 1196 } 1197 1198 return JVMTI_ERROR_NONE; 1199} /* end GetTopThreadGroups */ 1200 1201 1202// info_ptr - pre-checked for NULL 1203jvmtiError 1204JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) { 1205 ResourceMark rm; 1206 HandleMark hm; 1207 1208 JavaThread* current_thread = JavaThread::current(); 1209 1210 Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group)); 1211 NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP); 1212 1213 const char* name; 1214 Handle parent_group; 1215 bool is_daemon; 1216 ThreadPriority max_priority; 1217 1218 { MutexLocker mu(Threads_lock); 1219 1220 name = java_lang_ThreadGroup::name(group_obj()); 1221 parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj())); 1222 is_daemon = java_lang_ThreadGroup::is_daemon(group_obj()); 1223 max_priority = java_lang_ThreadGroup::maxPriority(group_obj()); 1224 } 1225 1226 info_ptr->is_daemon = is_daemon; 1227 info_ptr->max_priority = max_priority; 1228 info_ptr->parent = jni_reference(parent_group); 1229 1230 if (name != NULL) { 1231 info_ptr->name = (char*)jvmtiMalloc(strlen(name)+1); 1232 NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY); 1233 strcpy(info_ptr->name, name); 1234 } else { 1235 info_ptr->name = NULL; 1236 } 1237 1238 return JVMTI_ERROR_NONE; 1239} /* end GetThreadGroupInfo */ 1240 1241 1242// thread_count_ptr - pre-checked for NULL 1243// threads_ptr - pre-checked for NULL 1244// group_count_ptr - pre-checked for NULL 1245// groups_ptr - pre-checked for NULL 1246jvmtiError 1247JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) { 1248 JavaThread* current_thread = JavaThread::current(); 1249 oop group_obj = (oop) JNIHandles::resolve_external_guard(group); 1250 NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP); 1251 1252 Handle *thread_objs = NULL; 1253 Handle *group_objs = NULL; 1254 int nthreads = 0; 1255 int ngroups = 0; 1256 int hidden_threads = 0; 1257 1258 ResourceMark rm; 1259 HandleMark hm; 1260 1261 Handle group_hdl(current_thread, group_obj); 1262 1263 { MutexLocker mu(Threads_lock); 1264 1265 nthreads = java_lang_ThreadGroup::nthreads(group_hdl()); 1266 ngroups = java_lang_ThreadGroup::ngroups(group_hdl()); 1267 1268 if (nthreads > 0) { 1269 objArrayOop threads = java_lang_ThreadGroup::threads(group_hdl()); 1270 assert(nthreads <= threads->length(), "too many threads"); 1271 thread_objs = NEW_RESOURCE_ARRAY(Handle,nthreads); 1272 for (int i=0, j=0; i<nthreads; i++) { 1273 oop thread_obj = threads->obj_at(i); 1274 assert(thread_obj != NULL, "thread_obj is NULL"); 1275 JavaThread *javathread = java_lang_Thread::thread(thread_obj); 1276 // Filter out hidden java threads. 1277 if (javathread != NULL && javathread->is_hidden_from_external_view()) { 1278 hidden_threads++; 1279 continue; 1280 } 1281 thread_objs[j++] = Handle(current_thread, thread_obj); 1282 } 1283 nthreads -= hidden_threads; 1284 } 1285 if (ngroups > 0) { 1286 objArrayOop groups = java_lang_ThreadGroup::groups(group_hdl()); 1287 assert(ngroups <= groups->length(), "too many threads"); 1288 group_objs = NEW_RESOURCE_ARRAY(Handle,ngroups); 1289 for (int i=0; i<ngroups; i++) { 1290 oop group_obj = groups->obj_at(i); 1291 assert(group_obj != NULL, "group_obj != NULL"); 1292 group_objs[i] = Handle(current_thread, group_obj); 1293 } 1294 } 1295 } 1296 1297 // have to make global handles outside of Threads_lock 1298 *group_count_ptr = ngroups; 1299 *thread_count_ptr = nthreads; 1300 *threads_ptr = new_jthreadArray(nthreads, thread_objs); 1301 *groups_ptr = new_jthreadGroupArray(ngroups, group_objs); 1302 if ((nthreads > 0) && (*threads_ptr == NULL)) { 1303 return JVMTI_ERROR_OUT_OF_MEMORY; 1304 } 1305 if ((ngroups > 0) && (*groups_ptr == NULL)) { 1306 return JVMTI_ERROR_OUT_OF_MEMORY; 1307 } 1308 1309 return JVMTI_ERROR_NONE; 1310} /* end GetThreadGroupChildren */ 1311 1312 1313 // 1314 // Stack Frame functions 1315 // 1316 1317// Threads_lock NOT held, java_thread not protected by lock 1318// java_thread - pre-checked 1319// max_frame_count - pre-checked to be greater than or equal to 0 1320// frame_buffer - pre-checked for NULL 1321// count_ptr - pre-checked for NULL 1322jvmtiError 1323JvmtiEnv::GetStackTrace(JavaThread* java_thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) { 1324 jvmtiError err = JVMTI_ERROR_NONE; 1325 1326 // It is only safe to perform the direct operation on the current 1327 // thread. All other usage needs to use a vm-safepoint-op for safety. 1328 if (java_thread == JavaThread::current()) { 1329 err = get_stack_trace(java_thread, start_depth, max_frame_count, frame_buffer, count_ptr); 1330 } else { 1331 // JVMTI get stack trace at safepoint. Do not require target thread to 1332 // be suspended. 1333 VM_GetStackTrace op(this, java_thread, start_depth, max_frame_count, frame_buffer, count_ptr); 1334 VMThread::execute(&op); 1335 err = op.result(); 1336 } 1337 1338 return err; 1339} /* end GetStackTrace */ 1340 1341 1342// max_frame_count - pre-checked to be greater than or equal to 0 1343// stack_info_ptr - pre-checked for NULL 1344// thread_count_ptr - pre-checked for NULL 1345jvmtiError 1346JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) { 1347 jvmtiError err = JVMTI_ERROR_NONE; 1348 JavaThread* calling_thread = JavaThread::current(); 1349 1350 // JVMTI get stack traces at safepoint. 1351 VM_GetAllStackTraces op(this, calling_thread, max_frame_count); 1352 VMThread::execute(&op); 1353 *thread_count_ptr = op.final_thread_count(); 1354 *stack_info_ptr = op.stack_info(); 1355 err = op.result(); 1356 return err; 1357} /* end GetAllStackTraces */ 1358 1359 1360// thread_count - pre-checked to be greater than or equal to 0 1361// thread_list - pre-checked for NULL 1362// max_frame_count - pre-checked to be greater than or equal to 0 1363// stack_info_ptr - pre-checked for NULL 1364jvmtiError 1365JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) { 1366 jvmtiError err = JVMTI_ERROR_NONE; 1367 // JVMTI get stack traces at safepoint. 1368 VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count); 1369 VMThread::execute(&op); 1370 err = op.result(); 1371 if (err == JVMTI_ERROR_NONE) { 1372 *stack_info_ptr = op.stack_info(); 1373 } 1374 return err; 1375} /* end GetThreadListStackTraces */ 1376 1377 1378// Threads_lock NOT held, java_thread not protected by lock 1379// java_thread - pre-checked 1380// count_ptr - pre-checked for NULL 1381jvmtiError 1382JvmtiEnv::GetFrameCount(JavaThread* java_thread, jint* count_ptr) { 1383 jvmtiError err = JVMTI_ERROR_NONE; 1384 1385 // retrieve or create JvmtiThreadState. 1386 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread); 1387 if (state == NULL) { 1388 return JVMTI_ERROR_THREAD_NOT_ALIVE; 1389 } 1390 1391 // It is only safe to perform the direct operation on the current 1392 // thread. All other usage needs to use a vm-safepoint-op for safety. 1393 if (java_thread == JavaThread::current()) { 1394 err = get_frame_count(state, count_ptr); 1395 } else { 1396 // get java stack frame count at safepoint. 1397 VM_GetFrameCount op(this, state, count_ptr); 1398 VMThread::execute(&op); 1399 err = op.result(); 1400 } 1401 return err; 1402} /* end GetFrameCount */ 1403 1404 1405// Threads_lock NOT held, java_thread not protected by lock 1406// java_thread - pre-checked 1407jvmtiError 1408JvmtiEnv::PopFrame(JavaThread* java_thread) { 1409 JavaThread* current_thread = JavaThread::current(); 1410 HandleMark hm(current_thread); 1411 uint32_t debug_bits = 0; 1412 1413 // retrieve or create the state 1414 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread); 1415 if (state == NULL) { 1416 return JVMTI_ERROR_THREAD_NOT_ALIVE; 1417 } 1418 1419 // Check if java_thread is fully suspended 1420 if (!is_thread_fully_suspended(java_thread, true /* wait for suspend completion */, &debug_bits)) { 1421 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; 1422 } 1423 // Check to see if a PopFrame was already in progress 1424 if (java_thread->popframe_condition() != JavaThread::popframe_inactive) { 1425 // Probably possible for JVMTI clients to trigger this, but the 1426 // JPDA backend shouldn't allow this to happen 1427 return JVMTI_ERROR_INTERNAL; 1428 } 1429 1430 { 1431 // Was workaround bug 1432 // 4812902: popFrame hangs if the method is waiting at a synchronize 1433 // Catch this condition and return an error to avoid hanging. 1434 // Now JVMTI spec allows an implementation to bail out with an opaque frame error. 1435 OSThread* osThread = java_thread->osthread(); 1436 if (osThread->get_state() == MONITOR_WAIT) { 1437 return JVMTI_ERROR_OPAQUE_FRAME; 1438 } 1439 } 1440 1441 { 1442 ResourceMark rm(current_thread); 1443 // Check if there are more than one Java frame in this thread, that the top two frames 1444 // are Java (not native) frames, and that there is no intervening VM frame 1445 int frame_count = 0; 1446 bool is_interpreted[2]; 1447 intptr_t *frame_sp[2]; 1448 // The 2-nd arg of constructor is needed to stop iterating at java entry frame. 1449 for (vframeStream vfs(java_thread, true); !vfs.at_end(); vfs.next()) { 1450 methodHandle mh(current_thread, vfs.method()); 1451 if (mh->is_native()) return(JVMTI_ERROR_OPAQUE_FRAME); 1452 is_interpreted[frame_count] = vfs.is_interpreted_frame(); 1453 frame_sp[frame_count] = vfs.frame_id(); 1454 if (++frame_count > 1) break; 1455 } 1456 if (frame_count < 2) { 1457 // We haven't found two adjacent non-native Java frames on the top. 1458 // There can be two situations here: 1459 // 1. There are no more java frames 1460 // 2. Two top java frames are separated by non-java native frames 1461 if(vframeFor(java_thread, 1) == NULL) { 1462 return JVMTI_ERROR_NO_MORE_FRAMES; 1463 } else { 1464 // Intervening non-java native or VM frames separate java frames. 1465 // Current implementation does not support this. See bug #5031735. 1466 // In theory it is possible to pop frames in such cases. 1467 return JVMTI_ERROR_OPAQUE_FRAME; 1468 } 1469 } 1470 1471 // If any of the top 2 frames is a compiled one, need to deoptimize it 1472 for (int i = 0; i < 2; i++) { 1473 if (!is_interpreted[i]) { 1474 Deoptimization::deoptimize_frame(java_thread, frame_sp[i]); 1475 } 1476 } 1477 1478 // Update the thread state to reflect that the top frame is popped 1479 // so that cur_stack_depth is maintained properly and all frameIDs 1480 // are invalidated. 1481 // The current frame will be popped later when the suspended thread 1482 // is resumed and right before returning from VM to Java. 1483 // (see call_VM_base() in assembler_<cpu>.cpp). 1484 1485 // It's fine to update the thread state here because no JVMTI events 1486 // shall be posted for this PopFrame. 1487 1488 // It is only safe to perform the direct operation on the current 1489 // thread. All other usage needs to use a vm-safepoint-op for safety. 1490 if (java_thread == JavaThread::current()) { 1491 state->update_for_pop_top_frame(); 1492 } else { 1493 VM_UpdateForPopTopFrame op(state); 1494 VMThread::execute(&op); 1495 jvmtiError err = op.result(); 1496 if (err != JVMTI_ERROR_NONE) { 1497 return err; 1498 } 1499 } 1500 1501 java_thread->set_popframe_condition(JavaThread::popframe_pending_bit); 1502 // Set pending step flag for this popframe and it is cleared when next 1503 // step event is posted. 1504 state->set_pending_step_for_popframe(); 1505 } 1506 1507 return JVMTI_ERROR_NONE; 1508} /* end PopFrame */ 1509 1510 1511// Threads_lock NOT held, java_thread not protected by lock 1512// java_thread - pre-checked 1513// java_thread - unchecked 1514// depth - pre-checked as non-negative 1515// method_ptr - pre-checked for NULL 1516// location_ptr - pre-checked for NULL 1517jvmtiError 1518JvmtiEnv::GetFrameLocation(JavaThread* java_thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) { 1519 jvmtiError err = JVMTI_ERROR_NONE; 1520 1521 // It is only safe to perform the direct operation on the current 1522 // thread. All other usage needs to use a vm-safepoint-op for safety. 1523 if (java_thread == JavaThread::current()) { 1524 err = get_frame_location(java_thread, depth, method_ptr, location_ptr); 1525 } else { 1526 // JVMTI get java stack frame location at safepoint. 1527 VM_GetFrameLocation op(this, java_thread, depth, method_ptr, location_ptr); 1528 VMThread::execute(&op); 1529 err = op.result(); 1530 } 1531 return err; 1532} /* end GetFrameLocation */ 1533 1534 1535// Threads_lock NOT held, java_thread not protected by lock 1536// java_thread - pre-checked 1537// java_thread - unchecked 1538// depth - pre-checked as non-negative 1539jvmtiError 1540JvmtiEnv::NotifyFramePop(JavaThread* java_thread, jint depth) { 1541 jvmtiError err = JVMTI_ERROR_NONE; 1542 ResourceMark rm; 1543 uint32_t debug_bits = 0; 1544 1545 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread); 1546 if (state == NULL) { 1547 return JVMTI_ERROR_THREAD_NOT_ALIVE; 1548 } 1549 1550 if (!JvmtiEnv::is_thread_fully_suspended(java_thread, true, &debug_bits)) { 1551 return JVMTI_ERROR_THREAD_NOT_SUSPENDED; 1552 } 1553 1554 if (TraceJVMTICalls) { 1555 JvmtiSuspendControl::print(); 1556 } 1557 1558 vframe *vf = vframeFor(java_thread, depth); 1559 if (vf == NULL) { 1560 return JVMTI_ERROR_NO_MORE_FRAMES; 1561 } 1562 1563 if (!vf->is_java_frame() || ((javaVFrame*) vf)->method()->is_native()) { 1564 return JVMTI_ERROR_OPAQUE_FRAME; 1565 } 1566 1567 assert(vf->frame_pointer() != NULL, "frame pointer mustn't be NULL"); 1568 1569 // It is only safe to perform the direct operation on the current 1570 // thread. All other usage needs to use a vm-safepoint-op for safety. 1571 if (java_thread == JavaThread::current()) { 1572 int frame_number = state->count_frames() - depth; 1573 state->env_thread_state(this)->set_frame_pop(frame_number); 1574 } else { 1575 VM_SetFramePop op(this, state, depth); 1576 VMThread::execute(&op); 1577 err = op.result(); 1578 } 1579 return err; 1580} /* end NotifyFramePop */ 1581 1582 1583 // 1584 // Force Early Return functions 1585 // 1586 1587// Threads_lock NOT held, java_thread not protected by lock 1588// java_thread - pre-checked 1589jvmtiError 1590JvmtiEnv::ForceEarlyReturnObject(JavaThread* java_thread, jobject value) { 1591 jvalue val; 1592 val.l = value; 1593 return force_early_return(java_thread, val, atos); 1594} /* end ForceEarlyReturnObject */ 1595 1596 1597// Threads_lock NOT held, java_thread not protected by lock 1598// java_thread - pre-checked 1599jvmtiError 1600JvmtiEnv::ForceEarlyReturnInt(JavaThread* java_thread, jint value) { 1601 jvalue val; 1602 val.i = value; 1603 return force_early_return(java_thread, val, itos); 1604} /* end ForceEarlyReturnInt */ 1605 1606 1607// Threads_lock NOT held, java_thread not protected by lock 1608// java_thread - pre-checked 1609jvmtiError 1610JvmtiEnv::ForceEarlyReturnLong(JavaThread* java_thread, jlong value) { 1611 jvalue val; 1612 val.j = value; 1613 return force_early_return(java_thread, val, ltos); 1614} /* end ForceEarlyReturnLong */ 1615 1616 1617// Threads_lock NOT held, java_thread not protected by lock 1618// java_thread - pre-checked 1619jvmtiError 1620JvmtiEnv::ForceEarlyReturnFloat(JavaThread* java_thread, jfloat value) { 1621 jvalue val; 1622 val.f = value; 1623 return force_early_return(java_thread, val, ftos); 1624} /* end ForceEarlyReturnFloat */ 1625 1626 1627// Threads_lock NOT held, java_thread not protected by lock 1628// java_thread - pre-checked 1629jvmtiError 1630JvmtiEnv::ForceEarlyReturnDouble(JavaThread* java_thread, jdouble value) { 1631 jvalue val; 1632 val.d = value; 1633 return force_early_return(java_thread, val, dtos); 1634} /* end ForceEarlyReturnDouble */ 1635 1636 1637// Threads_lock NOT held, java_thread not protected by lock 1638// java_thread - pre-checked 1639jvmtiError 1640JvmtiEnv::ForceEarlyReturnVoid(JavaThread* java_thread) { 1641 jvalue val; 1642 val.j = 0L; 1643 return force_early_return(java_thread, val, vtos); 1644} /* end ForceEarlyReturnVoid */ 1645 1646 1647 // 1648 // Heap functions 1649 // 1650 1651// klass - NULL is a valid value, must be checked 1652// initial_object - NULL is a valid value, must be checked 1653// callbacks - pre-checked for NULL 1654// user_data - NULL is a valid value, must be checked 1655jvmtiError 1656JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) { 1657 // check klass if provided 1658 Klass* k_oop = NULL; 1659 if (klass != NULL) { 1660 oop k_mirror = JNIHandles::resolve_external_guard(klass); 1661 if (k_mirror == NULL) { 1662 return JVMTI_ERROR_INVALID_CLASS; 1663 } 1664 if (java_lang_Class::is_primitive(k_mirror)) { 1665 return JVMTI_ERROR_NONE; 1666 } 1667 k_oop = java_lang_Class::as_Klass(k_mirror); 1668 if (k_oop == NULL) { 1669 return JVMTI_ERROR_INVALID_CLASS; 1670 } 1671 } 1672 1673 Thread *thread = Thread::current(); 1674 HandleMark hm(thread); 1675 KlassHandle kh (thread, k_oop); 1676 1677 TraceTime t("FollowReferences", TraceJVMTIObjectTagging); 1678 JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, kh, initial_object, callbacks, user_data); 1679 return JVMTI_ERROR_NONE; 1680} /* end FollowReferences */ 1681 1682 1683// klass - NULL is a valid value, must be checked 1684// callbacks - pre-checked for NULL 1685// user_data - NULL is a valid value, must be checked 1686jvmtiError 1687JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) { 1688 // check klass if provided 1689 Klass* k_oop = NULL; 1690 if (klass != NULL) { 1691 oop k_mirror = JNIHandles::resolve_external_guard(klass); 1692 if (k_mirror == NULL) { 1693 return JVMTI_ERROR_INVALID_CLASS; 1694 } 1695 if (java_lang_Class::is_primitive(k_mirror)) { 1696 return JVMTI_ERROR_NONE; 1697 } 1698 k_oop = java_lang_Class::as_Klass(k_mirror); 1699 if (k_oop == NULL) { 1700 return JVMTI_ERROR_INVALID_CLASS; 1701 } 1702 } 1703 1704 Thread *thread = Thread::current(); 1705 HandleMark hm(thread); 1706 KlassHandle kh (thread, k_oop); 1707 1708 TraceTime t("IterateThroughHeap", TraceJVMTIObjectTagging); 1709 JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, kh, callbacks, user_data); 1710 return JVMTI_ERROR_NONE; 1711} /* end IterateThroughHeap */ 1712 1713 1714// tag_ptr - pre-checked for NULL 1715jvmtiError 1716JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) { 1717 oop o = JNIHandles::resolve_external_guard(object); 1718 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT); 1719 *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object); 1720 return JVMTI_ERROR_NONE; 1721} /* end GetTag */ 1722 1723 1724jvmtiError 1725JvmtiEnv::SetTag(jobject object, jlong tag) { 1726 oop o = JNIHandles::resolve_external_guard(object); 1727 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT); 1728 JvmtiTagMap::tag_map_for(this)->set_tag(object, tag); 1729 return JVMTI_ERROR_NONE; 1730} /* end SetTag */ 1731 1732 1733// tag_count - pre-checked to be greater than or equal to 0 1734// tags - pre-checked for NULL 1735// count_ptr - pre-checked for NULL 1736// object_result_ptr - NULL is a valid value, must be checked 1737// tag_result_ptr - NULL is a valid value, must be checked 1738jvmtiError 1739JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) { 1740 TraceTime t("GetObjectsWithTags", TraceJVMTIObjectTagging); 1741 return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr); 1742} /* end GetObjectsWithTags */ 1743 1744 1745jvmtiError 1746JvmtiEnv::ForceGarbageCollection() { 1747 Universe::heap()->collect(GCCause::_jvmti_force_gc); 1748 return JVMTI_ERROR_NONE; 1749} /* end ForceGarbageCollection */ 1750 1751 1752 // 1753 // Heap (1.0) functions 1754 // 1755 1756// object_reference_callback - pre-checked for NULL 1757// user_data - NULL is a valid value, must be checked 1758jvmtiError 1759JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) { 1760 oop o = JNIHandles::resolve_external_guard(object); 1761 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT); 1762 JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data); 1763 return JVMTI_ERROR_NONE; 1764} /* end IterateOverObjectsReachableFromObject */ 1765 1766 1767// heap_root_callback - NULL is a valid value, must be checked 1768// stack_ref_callback - NULL is a valid value, must be checked 1769// object_ref_callback - NULL is a valid value, must be checked 1770// user_data - NULL is a valid value, must be checked 1771jvmtiError 1772JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) { 1773 TraceTime t("IterateOverReachableObjects", TraceJVMTIObjectTagging); 1774 JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data); 1775 return JVMTI_ERROR_NONE; 1776} /* end IterateOverReachableObjects */ 1777 1778 1779// heap_object_callback - pre-checked for NULL 1780// user_data - NULL is a valid value, must be checked 1781jvmtiError 1782JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) { 1783 TraceTime t("IterateOverHeap", TraceJVMTIObjectTagging); 1784 Thread *thread = Thread::current(); 1785 HandleMark hm(thread); 1786 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, KlassHandle(), heap_object_callback, user_data); 1787 return JVMTI_ERROR_NONE; 1788} /* end IterateOverHeap */ 1789 1790 1791// k_mirror - may be primitive, this must be checked 1792// heap_object_callback - pre-checked for NULL 1793// user_data - NULL is a valid value, must be checked 1794jvmtiError 1795JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) { 1796 if (java_lang_Class::is_primitive(k_mirror)) { 1797 // DO PRIMITIVE CLASS PROCESSING 1798 return JVMTI_ERROR_NONE; 1799 } 1800 Klass* k_oop = java_lang_Class::as_Klass(k_mirror); 1801 if (k_oop == NULL) { 1802 return JVMTI_ERROR_INVALID_CLASS; 1803 } 1804 Thread *thread = Thread::current(); 1805 HandleMark hm(thread); 1806 KlassHandle klass (thread, k_oop); 1807 TraceTime t("IterateOverInstancesOfClass", TraceJVMTIObjectTagging); 1808 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data); 1809 return JVMTI_ERROR_NONE; 1810} /* end IterateOverInstancesOfClass */ 1811 1812 1813 // 1814 // Local Variable functions 1815 // 1816 1817// Threads_lock NOT held, java_thread not protected by lock 1818// java_thread - pre-checked 1819// java_thread - unchecked 1820// depth - pre-checked as non-negative 1821// value_ptr - pre-checked for NULL 1822jvmtiError 1823JvmtiEnv::GetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject* value_ptr) { 1824 JavaThread* current_thread = JavaThread::current(); 1825 // rm object is created to clean up the javaVFrame created in 1826 // doit_prologue(), but after doit() is finished with it. 1827 ResourceMark rm(current_thread); 1828 1829 VM_GetOrSetLocal op(java_thread, current_thread, depth, slot); 1830 VMThread::execute(&op); 1831 jvmtiError err = op.result(); 1832 if (err != JVMTI_ERROR_NONE) { 1833 return err; 1834 } else { 1835 *value_ptr = op.value().l; 1836 return JVMTI_ERROR_NONE; 1837 } 1838} /* end GetLocalObject */ 1839 1840// Threads_lock NOT held, java_thread not protected by lock 1841// java_thread - pre-checked 1842// java_thread - unchecked 1843// depth - pre-checked as non-negative 1844// value - pre-checked for NULL 1845jvmtiError 1846JvmtiEnv::GetLocalInstance(JavaThread* java_thread, jint depth, jobject* value_ptr){ 1847 JavaThread* current_thread = JavaThread::current(); 1848 // rm object is created to clean up the javaVFrame created in 1849 // doit_prologue(), but after doit() is finished with it. 1850 ResourceMark rm(current_thread); 1851 1852 VM_GetReceiver op(java_thread, current_thread, depth); 1853 VMThread::execute(&op); 1854 jvmtiError err = op.result(); 1855 if (err != JVMTI_ERROR_NONE) { 1856 return err; 1857 } else { 1858 *value_ptr = op.value().l; 1859 return JVMTI_ERROR_NONE; 1860 } 1861} /* end GetLocalInstance */ 1862 1863 1864// Threads_lock NOT held, java_thread not protected by lock 1865// java_thread - pre-checked 1866// java_thread - unchecked 1867// depth - pre-checked as non-negative 1868// value_ptr - pre-checked for NULL 1869jvmtiError 1870JvmtiEnv::GetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint* value_ptr) { 1871 // rm object is created to clean up the javaVFrame created in 1872 // doit_prologue(), but after doit() is finished with it. 1873 ResourceMark rm; 1874 1875 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT); 1876 VMThread::execute(&op); 1877 *value_ptr = op.value().i; 1878 return op.result(); 1879} /* end GetLocalInt */ 1880 1881 1882// Threads_lock NOT held, java_thread not protected by lock 1883// java_thread - pre-checked 1884// java_thread - unchecked 1885// depth - pre-checked as non-negative 1886// value_ptr - pre-checked for NULL 1887jvmtiError 1888JvmtiEnv::GetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong* value_ptr) { 1889 // rm object is created to clean up the javaVFrame created in 1890 // doit_prologue(), but after doit() is finished with it. 1891 ResourceMark rm; 1892 1893 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG); 1894 VMThread::execute(&op); 1895 *value_ptr = op.value().j; 1896 return op.result(); 1897} /* end GetLocalLong */ 1898 1899 1900// Threads_lock NOT held, java_thread not protected by lock 1901// java_thread - pre-checked 1902// java_thread - unchecked 1903// depth - pre-checked as non-negative 1904// value_ptr - pre-checked for NULL 1905jvmtiError 1906JvmtiEnv::GetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat* value_ptr) { 1907 // rm object is created to clean up the javaVFrame created in 1908 // doit_prologue(), but after doit() is finished with it. 1909 ResourceMark rm; 1910 1911 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT); 1912 VMThread::execute(&op); 1913 *value_ptr = op.value().f; 1914 return op.result(); 1915} /* end GetLocalFloat */ 1916 1917 1918// Threads_lock NOT held, java_thread not protected by lock 1919// java_thread - pre-checked 1920// java_thread - unchecked 1921// depth - pre-checked as non-negative 1922// value_ptr - pre-checked for NULL 1923jvmtiError 1924JvmtiEnv::GetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble* value_ptr) { 1925 // rm object is created to clean up the javaVFrame created in 1926 // doit_prologue(), but after doit() is finished with it. 1927 ResourceMark rm; 1928 1929 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE); 1930 VMThread::execute(&op); 1931 *value_ptr = op.value().d; 1932 return op.result(); 1933} /* end GetLocalDouble */ 1934 1935 1936// Threads_lock NOT held, java_thread not protected by lock 1937// java_thread - pre-checked 1938// java_thread - unchecked 1939// depth - pre-checked as non-negative 1940jvmtiError 1941JvmtiEnv::SetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject value) { 1942 // rm object is created to clean up the javaVFrame created in 1943 // doit_prologue(), but after doit() is finished with it. 1944 ResourceMark rm; 1945 jvalue val; 1946 val.l = value; 1947 VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val); 1948 VMThread::execute(&op); 1949 return op.result(); 1950} /* end SetLocalObject */ 1951 1952 1953// Threads_lock NOT held, java_thread not protected by lock 1954// java_thread - pre-checked 1955// java_thread - unchecked 1956// depth - pre-checked as non-negative 1957jvmtiError 1958JvmtiEnv::SetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint value) { 1959 // rm object is created to clean up the javaVFrame created in 1960 // doit_prologue(), but after doit() is finished with it. 1961 ResourceMark rm; 1962 jvalue val; 1963 val.i = value; 1964 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val); 1965 VMThread::execute(&op); 1966 return op.result(); 1967} /* end SetLocalInt */ 1968 1969 1970// Threads_lock NOT held, java_thread not protected by lock 1971// java_thread - pre-checked 1972// java_thread - unchecked 1973// depth - pre-checked as non-negative 1974jvmtiError 1975JvmtiEnv::SetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong value) { 1976 // rm object is created to clean up the javaVFrame created in 1977 // doit_prologue(), but after doit() is finished with it. 1978 ResourceMark rm; 1979 jvalue val; 1980 val.j = value; 1981 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val); 1982 VMThread::execute(&op); 1983 return op.result(); 1984} /* end SetLocalLong */ 1985 1986 1987// Threads_lock NOT held, java_thread not protected by lock 1988// java_thread - pre-checked 1989// java_thread - unchecked 1990// depth - pre-checked as non-negative 1991jvmtiError 1992JvmtiEnv::SetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat value) { 1993 // rm object is created to clean up the javaVFrame created in 1994 // doit_prologue(), but after doit() is finished with it. 1995 ResourceMark rm; 1996 jvalue val; 1997 val.f = value; 1998 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val); 1999 VMThread::execute(&op); 2000 return op.result(); 2001} /* end SetLocalFloat */ 2002 2003 2004// Threads_lock NOT held, java_thread not protected by lock 2005// java_thread - pre-checked 2006// java_thread - unchecked 2007// depth - pre-checked as non-negative 2008jvmtiError 2009JvmtiEnv::SetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble value) { 2010 // rm object is created to clean up the javaVFrame created in 2011 // doit_prologue(), but after doit() is finished with it. 2012 ResourceMark rm; 2013 jvalue val; 2014 val.d = value; 2015 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val); 2016 VMThread::execute(&op); 2017 return op.result(); 2018} /* end SetLocalDouble */ 2019 2020 2021 // 2022 // Breakpoint functions 2023 // 2024 2025// method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2026jvmtiError 2027JvmtiEnv::SetBreakpoint(Method* method_oop, jlocation location) { 2028 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2029 if (location < 0) { // simple invalid location check first 2030 return JVMTI_ERROR_INVALID_LOCATION; 2031 } 2032 // verify that the breakpoint is not past the end of the method 2033 if (location >= (jlocation) method_oop->code_size()) { 2034 return JVMTI_ERROR_INVALID_LOCATION; 2035 } 2036 2037 ResourceMark rm; 2038 JvmtiBreakpoint bp(method_oop, location); 2039 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints(); 2040 if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE) 2041 return JVMTI_ERROR_DUPLICATE; 2042 2043 if (TraceJVMTICalls) { 2044 jvmti_breakpoints.print(); 2045 } 2046 2047 return JVMTI_ERROR_NONE; 2048} /* end SetBreakpoint */ 2049 2050 2051// method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2052jvmtiError 2053JvmtiEnv::ClearBreakpoint(Method* method_oop, jlocation location) { 2054 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2055 2056 if (location < 0) { // simple invalid location check first 2057 return JVMTI_ERROR_INVALID_LOCATION; 2058 } 2059 2060 // verify that the breakpoint is not past the end of the method 2061 if (location >= (jlocation) method_oop->code_size()) { 2062 return JVMTI_ERROR_INVALID_LOCATION; 2063 } 2064 2065 JvmtiBreakpoint bp(method_oop, location); 2066 2067 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints(); 2068 if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND) 2069 return JVMTI_ERROR_NOT_FOUND; 2070 2071 if (TraceJVMTICalls) { 2072 jvmti_breakpoints.print(); 2073 } 2074 2075 return JVMTI_ERROR_NONE; 2076} /* end ClearBreakpoint */ 2077 2078 2079 // 2080 // Watched Field functions 2081 // 2082 2083jvmtiError 2084JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) { 2085 // make sure we haven't set this watch before 2086 if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE; 2087 fdesc_ptr->set_is_field_access_watched(true); 2088 2089 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true); 2090 2091 return JVMTI_ERROR_NONE; 2092} /* end SetFieldAccessWatch */ 2093 2094 2095jvmtiError 2096JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) { 2097 // make sure we have a watch to clear 2098 if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND; 2099 fdesc_ptr->set_is_field_access_watched(false); 2100 2101 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false); 2102 2103 return JVMTI_ERROR_NONE; 2104} /* end ClearFieldAccessWatch */ 2105 2106 2107jvmtiError 2108JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) { 2109 // make sure we haven't set this watch before 2110 if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE; 2111 fdesc_ptr->set_is_field_modification_watched(true); 2112 2113 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true); 2114 2115 return JVMTI_ERROR_NONE; 2116} /* end SetFieldModificationWatch */ 2117 2118 2119jvmtiError 2120JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) { 2121 // make sure we have a watch to clear 2122 if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND; 2123 fdesc_ptr->set_is_field_modification_watched(false); 2124 2125 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false); 2126 2127 return JVMTI_ERROR_NONE; 2128} /* end ClearFieldModificationWatch */ 2129 2130 // 2131 // Class functions 2132 // 2133 2134 2135// k_mirror - may be primitive, this must be checked 2136// signature_ptr - NULL is a valid value, must be checked 2137// generic_ptr - NULL is a valid value, must be checked 2138jvmtiError 2139JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) { 2140 ResourceMark rm; 2141 bool isPrimitive = java_lang_Class::is_primitive(k_mirror); 2142 Klass* k = NULL; 2143 if (!isPrimitive) { 2144 k = java_lang_Class::as_Klass(k_mirror); 2145 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS); 2146 } 2147 if (signature_ptr != NULL) { 2148 char* result = NULL; 2149 if (isPrimitive) { 2150 char tchar = type2char(java_lang_Class::primitive_type(k_mirror)); 2151 result = (char*) jvmtiMalloc(2); 2152 result[0] = tchar; 2153 result[1] = '\0'; 2154 } else { 2155 const char* class_sig = k->signature_name(); 2156 result = (char *) jvmtiMalloc(strlen(class_sig)+1); 2157 strcpy(result, class_sig); 2158 } 2159 *signature_ptr = result; 2160 } 2161 if (generic_ptr != NULL) { 2162 *generic_ptr = NULL; 2163 if (!isPrimitive && k->is_instance_klass()) { 2164 Symbol* soo = InstanceKlass::cast(k)->generic_signature(); 2165 if (soo != NULL) { 2166 const char *gen_sig = soo->as_C_string(); 2167 if (gen_sig != NULL) { 2168 char* gen_result; 2169 jvmtiError err = allocate(strlen(gen_sig) + 1, 2170 (unsigned char **)&gen_result); 2171 if (err != JVMTI_ERROR_NONE) { 2172 return err; 2173 } 2174 strcpy(gen_result, gen_sig); 2175 *generic_ptr = gen_result; 2176 } 2177 } 2178 } 2179 } 2180 return JVMTI_ERROR_NONE; 2181} /* end GetClassSignature */ 2182 2183 2184// k_mirror - may be primitive, this must be checked 2185// status_ptr - pre-checked for NULL 2186jvmtiError 2187JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) { 2188 jint result = 0; 2189 if (java_lang_Class::is_primitive(k_mirror)) { 2190 result |= JVMTI_CLASS_STATUS_PRIMITIVE; 2191 } else { 2192 Klass* k = java_lang_Class::as_Klass(k_mirror); 2193 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS); 2194 result = k->jvmti_class_status(); 2195 } 2196 *status_ptr = result; 2197 2198 return JVMTI_ERROR_NONE; 2199} /* end GetClassStatus */ 2200 2201 2202// k_mirror - may be primitive, this must be checked 2203// source_name_ptr - pre-checked for NULL 2204jvmtiError 2205JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) { 2206 if (java_lang_Class::is_primitive(k_mirror)) { 2207 return JVMTI_ERROR_ABSENT_INFORMATION; 2208 } 2209 Klass* k_klass = java_lang_Class::as_Klass(k_mirror); 2210 NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS); 2211 2212 if (!k_klass->is_instance_klass()) { 2213 return JVMTI_ERROR_ABSENT_INFORMATION; 2214 } 2215 2216 Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name(); 2217 NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION); 2218 { 2219 JavaThread* current_thread = JavaThread::current(); 2220 ResourceMark rm(current_thread); 2221 const char* sfncp = (const char*) sfnOop->as_C_string(); 2222 *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1); 2223 strcpy(*source_name_ptr, sfncp); 2224 } 2225 2226 return JVMTI_ERROR_NONE; 2227} /* end GetSourceFileName */ 2228 2229 2230// k_mirror - may be primitive, this must be checked 2231// modifiers_ptr - pre-checked for NULL 2232jvmtiError 2233JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) { 2234 JavaThread* current_thread = JavaThread::current(); 2235 jint result = 0; 2236 if (!java_lang_Class::is_primitive(k_mirror)) { 2237 Klass* k = java_lang_Class::as_Klass(k_mirror); 2238 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS); 2239 result = k->compute_modifier_flags(current_thread); 2240 JavaThread* THREAD = current_thread; // pass to macros 2241 if (HAS_PENDING_EXCEPTION) { 2242 CLEAR_PENDING_EXCEPTION; 2243 return JVMTI_ERROR_INTERNAL; 2244 }; 2245 2246 // Reset the deleted ACC_SUPER bit ( deleted in compute_modifier_flags()). 2247 if(k->is_super()) { 2248 result |= JVM_ACC_SUPER; 2249 } 2250 } else { 2251 result = (JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC); 2252 } 2253 *modifiers_ptr = result; 2254 2255 return JVMTI_ERROR_NONE; 2256} /* end GetClassModifiers */ 2257 2258 2259// k_mirror - may be primitive, this must be checked 2260// method_count_ptr - pre-checked for NULL 2261// methods_ptr - pre-checked for NULL 2262jvmtiError 2263JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) { 2264 JavaThread* current_thread = JavaThread::current(); 2265 HandleMark hm(current_thread); 2266 2267 if (java_lang_Class::is_primitive(k_mirror)) { 2268 *method_count_ptr = 0; 2269 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID)); 2270 return JVMTI_ERROR_NONE; 2271 } 2272 Klass* k = java_lang_Class::as_Klass(k_mirror); 2273 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS); 2274 2275 // Return CLASS_NOT_PREPARED error as per JVMTI spec. 2276 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) { 2277 return JVMTI_ERROR_CLASS_NOT_PREPARED; 2278 } 2279 2280 if (!k->is_instance_klass()) { 2281 *method_count_ptr = 0; 2282 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID)); 2283 return JVMTI_ERROR_NONE; 2284 } 2285 instanceKlassHandle instanceK_h(current_thread, k); 2286 // Allocate the result and fill it in 2287 int result_length = instanceK_h->methods()->length(); 2288 jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID)); 2289 int index; 2290 bool jmethodids_found = true; 2291 2292 if (JvmtiExport::can_maintain_original_method_order()) { 2293 // Use the original method ordering indices stored in the class, so we can emit 2294 // jmethodIDs in the order they appeared in the class file 2295 for (index = 0; index < result_length; index++) { 2296 Method* m = instanceK_h->methods()->at(index); 2297 int original_index = instanceK_h->method_ordering()->at(index); 2298 assert(original_index >= 0 && original_index < result_length, "invalid original method index"); 2299 jmethodID id; 2300 if (jmethodids_found) { 2301 id = m->find_jmethod_id_or_null(); 2302 if (id == NULL) { 2303 // If we find an uninitialized value, make sure there is 2304 // enough space for all the uninitialized values we might 2305 // find. 2306 instanceK_h->ensure_space_for_methodids(index); 2307 jmethodids_found = false; 2308 id = m->jmethod_id(); 2309 } 2310 } else { 2311 id = m->jmethod_id(); 2312 } 2313 result_list[original_index] = id; 2314 } 2315 } else { 2316 // otherwise just copy in any order 2317 for (index = 0; index < result_length; index++) { 2318 Method* m = instanceK_h->methods()->at(index); 2319 jmethodID id; 2320 if (jmethodids_found) { 2321 id = m->find_jmethod_id_or_null(); 2322 if (id == NULL) { 2323 // If we find an uninitialized value, make sure there is 2324 // enough space for all the uninitialized values we might 2325 // find. 2326 instanceK_h->ensure_space_for_methodids(index); 2327 jmethodids_found = false; 2328 id = m->jmethod_id(); 2329 } 2330 } else { 2331 id = m->jmethod_id(); 2332 } 2333 result_list[index] = id; 2334 } 2335 } 2336 // Fill in return value. 2337 *method_count_ptr = result_length; 2338 *methods_ptr = result_list; 2339 2340 return JVMTI_ERROR_NONE; 2341} /* end GetClassMethods */ 2342 2343 2344// k_mirror - may be primitive, this must be checked 2345// field_count_ptr - pre-checked for NULL 2346// fields_ptr - pre-checked for NULL 2347jvmtiError 2348JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) { 2349 if (java_lang_Class::is_primitive(k_mirror)) { 2350 *field_count_ptr = 0; 2351 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID)); 2352 return JVMTI_ERROR_NONE; 2353 } 2354 JavaThread* current_thread = JavaThread::current(); 2355 HandleMark hm(current_thread); 2356 Klass* k = java_lang_Class::as_Klass(k_mirror); 2357 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS); 2358 2359 // Return CLASS_NOT_PREPARED error as per JVMTI spec. 2360 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) { 2361 return JVMTI_ERROR_CLASS_NOT_PREPARED; 2362 } 2363 2364 if (!k->is_instance_klass()) { 2365 *field_count_ptr = 0; 2366 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID)); 2367 return JVMTI_ERROR_NONE; 2368 } 2369 2370 2371 instanceKlassHandle instanceK_h(current_thread, k); 2372 2373 int result_count = 0; 2374 // First, count the fields. 2375 FilteredFieldStream flds(instanceK_h, true, true); 2376 result_count = flds.field_count(); 2377 2378 // Allocate the result and fill it in 2379 jfieldID* result_list = (jfieldID*) jvmtiMalloc(result_count * sizeof(jfieldID)); 2380 // The JVMTI spec requires fields in the order they occur in the class file, 2381 // this is the reverse order of what FieldStream hands out. 2382 int id_index = (result_count - 1); 2383 2384 for (FilteredFieldStream src_st(instanceK_h, true, true); !src_st.eos(); src_st.next()) { 2385 result_list[id_index--] = jfieldIDWorkaround::to_jfieldID( 2386 instanceK_h, src_st.offset(), 2387 src_st.access_flags().is_static()); 2388 } 2389 assert(id_index == -1, "just checking"); 2390 // Fill in the results 2391 *field_count_ptr = result_count; 2392 *fields_ptr = result_list; 2393 2394 return JVMTI_ERROR_NONE; 2395} /* end GetClassFields */ 2396 2397 2398// k_mirror - may be primitive, this must be checked 2399// interface_count_ptr - pre-checked for NULL 2400// interfaces_ptr - pre-checked for NULL 2401jvmtiError 2402JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) { 2403 { 2404 if (java_lang_Class::is_primitive(k_mirror)) { 2405 *interface_count_ptr = 0; 2406 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass)); 2407 return JVMTI_ERROR_NONE; 2408 } 2409 JavaThread* current_thread = JavaThread::current(); 2410 HandleMark hm(current_thread); 2411 Klass* k = java_lang_Class::as_Klass(k_mirror); 2412 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS); 2413 2414 // Return CLASS_NOT_PREPARED error as per JVMTI spec. 2415 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) 2416 return JVMTI_ERROR_CLASS_NOT_PREPARED; 2417 2418 if (!k->is_instance_klass()) { 2419 *interface_count_ptr = 0; 2420 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass)); 2421 return JVMTI_ERROR_NONE; 2422 } 2423 2424 Array<Klass*>* interface_list = InstanceKlass::cast(k)->local_interfaces(); 2425 const int result_length = (interface_list == NULL ? 0 : interface_list->length()); 2426 jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass)); 2427 for (int i_index = 0; i_index < result_length; i_index += 1) { 2428 Klass* klass_at = interface_list->at(i_index); 2429 assert(klass_at->is_klass(), "interfaces must be Klass*s"); 2430 assert(klass_at->is_interface(), "interfaces must be interfaces"); 2431 oop mirror_at = klass_at->java_mirror(); 2432 Handle handle_at = Handle(current_thread, mirror_at); 2433 result_list[i_index] = (jclass) jni_reference(handle_at); 2434 } 2435 *interface_count_ptr = result_length; 2436 *interfaces_ptr = result_list; 2437 } 2438 2439 return JVMTI_ERROR_NONE; 2440} /* end GetImplementedInterfaces */ 2441 2442 2443// k_mirror - may be primitive, this must be checked 2444// minor_version_ptr - pre-checked for NULL 2445// major_version_ptr - pre-checked for NULL 2446jvmtiError 2447JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) { 2448 if (java_lang_Class::is_primitive(k_mirror)) { 2449 return JVMTI_ERROR_ABSENT_INFORMATION; 2450 } 2451 Klass* k_oop = java_lang_Class::as_Klass(k_mirror); 2452 Thread *thread = Thread::current(); 2453 HandleMark hm(thread); 2454 KlassHandle klass(thread, k_oop); 2455 2456 jint status = klass->jvmti_class_status(); 2457 if (status & (JVMTI_CLASS_STATUS_ERROR)) { 2458 return JVMTI_ERROR_INVALID_CLASS; 2459 } 2460 if (status & (JVMTI_CLASS_STATUS_ARRAY)) { 2461 return JVMTI_ERROR_ABSENT_INFORMATION; 2462 } 2463 2464 instanceKlassHandle ik(thread, k_oop); 2465 *minor_version_ptr = ik->minor_version(); 2466 *major_version_ptr = ik->major_version(); 2467 2468 return JVMTI_ERROR_NONE; 2469} /* end GetClassVersionNumbers */ 2470 2471 2472// k_mirror - may be primitive, this must be checked 2473// constant_pool_count_ptr - pre-checked for NULL 2474// constant_pool_byte_count_ptr - pre-checked for NULL 2475// constant_pool_bytes_ptr - pre-checked for NULL 2476jvmtiError 2477JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) { 2478 if (java_lang_Class::is_primitive(k_mirror)) { 2479 return JVMTI_ERROR_ABSENT_INFORMATION; 2480 } 2481 2482 Klass* k_oop = java_lang_Class::as_Klass(k_mirror); 2483 Thread *thread = Thread::current(); 2484 HandleMark hm(thread); 2485 ResourceMark rm(thread); 2486 KlassHandle klass(thread, k_oop); 2487 2488 jint status = klass->jvmti_class_status(); 2489 if (status & (JVMTI_CLASS_STATUS_ERROR)) { 2490 return JVMTI_ERROR_INVALID_CLASS; 2491 } 2492 if (status & (JVMTI_CLASS_STATUS_ARRAY)) { 2493 return JVMTI_ERROR_ABSENT_INFORMATION; 2494 } 2495 2496 instanceKlassHandle ikh(thread, k_oop); 2497 JvmtiConstantPoolReconstituter reconstituter(ikh); 2498 if (reconstituter.get_error() != JVMTI_ERROR_NONE) { 2499 return reconstituter.get_error(); 2500 } 2501 2502 unsigned char *cpool_bytes; 2503 int cpool_size = reconstituter.cpool_size(); 2504 if (reconstituter.get_error() != JVMTI_ERROR_NONE) { 2505 return reconstituter.get_error(); 2506 } 2507 jvmtiError res = allocate(cpool_size, &cpool_bytes); 2508 if (res != JVMTI_ERROR_NONE) { 2509 return res; 2510 } 2511 reconstituter.copy_cpool_bytes(cpool_bytes); 2512 if (reconstituter.get_error() != JVMTI_ERROR_NONE) { 2513 return reconstituter.get_error(); 2514 } 2515 2516 constantPoolHandle constants(thread, ikh->constants()); 2517 *constant_pool_count_ptr = constants->length(); 2518 *constant_pool_byte_count_ptr = cpool_size; 2519 *constant_pool_bytes_ptr = cpool_bytes; 2520 2521 return JVMTI_ERROR_NONE; 2522} /* end GetConstantPool */ 2523 2524 2525// k_mirror - may be primitive, this must be checked 2526// is_interface_ptr - pre-checked for NULL 2527jvmtiError 2528JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) { 2529 { 2530 bool result = false; 2531 if (!java_lang_Class::is_primitive(k_mirror)) { 2532 Klass* k = java_lang_Class::as_Klass(k_mirror); 2533 if (k != NULL && k->is_interface()) { 2534 result = true; 2535 } 2536 } 2537 *is_interface_ptr = result; 2538 } 2539 2540 return JVMTI_ERROR_NONE; 2541} /* end IsInterface */ 2542 2543 2544// k_mirror - may be primitive, this must be checked 2545// is_array_class_ptr - pre-checked for NULL 2546jvmtiError 2547JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) { 2548 { 2549 bool result = false; 2550 if (!java_lang_Class::is_primitive(k_mirror)) { 2551 Klass* k = java_lang_Class::as_Klass(k_mirror); 2552 if (k != NULL && k->is_array_klass()) { 2553 result = true; 2554 } 2555 } 2556 *is_array_class_ptr = result; 2557 } 2558 2559 return JVMTI_ERROR_NONE; 2560} /* end IsArrayClass */ 2561 2562 2563// k_mirror - may be primitive, this must be checked 2564// classloader_ptr - pre-checked for NULL 2565jvmtiError 2566JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) { 2567 { 2568 if (java_lang_Class::is_primitive(k_mirror)) { 2569 *classloader_ptr = (jclass) jni_reference(Handle()); 2570 return JVMTI_ERROR_NONE; 2571 } 2572 JavaThread* current_thread = JavaThread::current(); 2573 HandleMark hm(current_thread); 2574 Klass* k = java_lang_Class::as_Klass(k_mirror); 2575 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS); 2576 2577 oop result_oop = k->class_loader(); 2578 if (result_oop == NULL) { 2579 *classloader_ptr = (jclass) jni_reference(Handle()); 2580 return JVMTI_ERROR_NONE; 2581 } 2582 Handle result_handle = Handle(current_thread, result_oop); 2583 jclass result_jnihandle = (jclass) jni_reference(result_handle); 2584 *classloader_ptr = result_jnihandle; 2585 } 2586 return JVMTI_ERROR_NONE; 2587} /* end GetClassLoader */ 2588 2589 2590// k_mirror - may be primitive, this must be checked 2591// source_debug_extension_ptr - pre-checked for NULL 2592jvmtiError 2593JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) { 2594 { 2595 if (java_lang_Class::is_primitive(k_mirror)) { 2596 return JVMTI_ERROR_ABSENT_INFORMATION; 2597 } 2598 Klass* k = java_lang_Class::as_Klass(k_mirror); 2599 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS); 2600 if (!k->is_instance_klass()) { 2601 return JVMTI_ERROR_ABSENT_INFORMATION; 2602 } 2603 const char* sde = InstanceKlass::cast(k)->source_debug_extension(); 2604 NULL_CHECK(sde, JVMTI_ERROR_ABSENT_INFORMATION); 2605 2606 { 2607 *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sde)+1); 2608 strcpy(*source_debug_extension_ptr, sde); 2609 } 2610 } 2611 2612 return JVMTI_ERROR_NONE; 2613} /* end GetSourceDebugExtension */ 2614 2615 // 2616 // Object functions 2617 // 2618 2619// hash_code_ptr - pre-checked for NULL 2620jvmtiError 2621JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) { 2622 oop mirror = JNIHandles::resolve_external_guard(object); 2623 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT); 2624 NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER); 2625 2626 { 2627 jint result = (jint) mirror->identity_hash(); 2628 *hash_code_ptr = result; 2629 } 2630 return JVMTI_ERROR_NONE; 2631} /* end GetObjectHashCode */ 2632 2633 2634// info_ptr - pre-checked for NULL 2635jvmtiError 2636JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) { 2637 JavaThread* calling_thread = JavaThread::current(); 2638 jvmtiError err = get_object_monitor_usage(calling_thread, object, info_ptr); 2639 if (err == JVMTI_ERROR_THREAD_NOT_SUSPENDED) { 2640 // Some of the critical threads were not suspended. go to a safepoint and try again 2641 VM_GetObjectMonitorUsage op(this, calling_thread, object, info_ptr); 2642 VMThread::execute(&op); 2643 err = op.result(); 2644 } 2645 return err; 2646} /* end GetObjectMonitorUsage */ 2647 2648 2649 // 2650 // Field functions 2651 // 2652 2653// name_ptr - NULL is a valid value, must be checked 2654// signature_ptr - NULL is a valid value, must be checked 2655// generic_ptr - NULL is a valid value, must be checked 2656jvmtiError 2657JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) { 2658 JavaThread* current_thread = JavaThread::current(); 2659 ResourceMark rm(current_thread); 2660 if (name_ptr == NULL) { 2661 // just don't return the name 2662 } else { 2663 const char* fieldName = fdesc_ptr->name()->as_C_string(); 2664 *name_ptr = (char*) jvmtiMalloc(strlen(fieldName) + 1); 2665 if (*name_ptr == NULL) 2666 return JVMTI_ERROR_OUT_OF_MEMORY; 2667 strcpy(*name_ptr, fieldName); 2668 } 2669 if (signature_ptr== NULL) { 2670 // just don't return the signature 2671 } else { 2672 const char* fieldSignature = fdesc_ptr->signature()->as_C_string(); 2673 *signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1); 2674 if (*signature_ptr == NULL) 2675 return JVMTI_ERROR_OUT_OF_MEMORY; 2676 strcpy(*signature_ptr, fieldSignature); 2677 } 2678 if (generic_ptr != NULL) { 2679 *generic_ptr = NULL; 2680 Symbol* soop = fdesc_ptr->generic_signature(); 2681 if (soop != NULL) { 2682 const char* gen_sig = soop->as_C_string(); 2683 if (gen_sig != NULL) { 2684 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr); 2685 if (err != JVMTI_ERROR_NONE) { 2686 return err; 2687 } 2688 strcpy(*generic_ptr, gen_sig); 2689 } 2690 } 2691 } 2692 return JVMTI_ERROR_NONE; 2693} /* end GetFieldName */ 2694 2695 2696// declaring_class_ptr - pre-checked for NULL 2697jvmtiError 2698JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) { 2699 2700 *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder()); 2701 return JVMTI_ERROR_NONE; 2702} /* end GetFieldDeclaringClass */ 2703 2704 2705// modifiers_ptr - pre-checked for NULL 2706jvmtiError 2707JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) { 2708 2709 AccessFlags resultFlags = fdesc_ptr->access_flags(); 2710 jint result = resultFlags.as_int(); 2711 *modifiers_ptr = result; 2712 2713 return JVMTI_ERROR_NONE; 2714} /* end GetFieldModifiers */ 2715 2716 2717// is_synthetic_ptr - pre-checked for NULL 2718jvmtiError 2719JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) { 2720 *is_synthetic_ptr = fdesc_ptr->is_synthetic(); 2721 return JVMTI_ERROR_NONE; 2722} /* end IsFieldSynthetic */ 2723 2724 2725 // 2726 // Method functions 2727 // 2728 2729// method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2730// name_ptr - NULL is a valid value, must be checked 2731// signature_ptr - NULL is a valid value, must be checked 2732// generic_ptr - NULL is a valid value, must be checked 2733jvmtiError 2734JvmtiEnv::GetMethodName(Method* method_oop, char** name_ptr, char** signature_ptr, char** generic_ptr) { 2735 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2736 JavaThread* current_thread = JavaThread::current(); 2737 2738 ResourceMark rm(current_thread); // get the utf8 name and signature 2739 if (name_ptr == NULL) { 2740 // just don't return the name 2741 } else { 2742 const char* utf8_name = (const char *) method_oop->name()->as_utf8(); 2743 *name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1); 2744 strcpy(*name_ptr, utf8_name); 2745 } 2746 if (signature_ptr == NULL) { 2747 // just don't return the signature 2748 } else { 2749 const char* utf8_signature = (const char *) method_oop->signature()->as_utf8(); 2750 *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1); 2751 strcpy(*signature_ptr, utf8_signature); 2752 } 2753 2754 if (generic_ptr != NULL) { 2755 *generic_ptr = NULL; 2756 Symbol* soop = method_oop->generic_signature(); 2757 if (soop != NULL) { 2758 const char* gen_sig = soop->as_C_string(); 2759 if (gen_sig != NULL) { 2760 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr); 2761 if (err != JVMTI_ERROR_NONE) { 2762 return err; 2763 } 2764 strcpy(*generic_ptr, gen_sig); 2765 } 2766 } 2767 } 2768 return JVMTI_ERROR_NONE; 2769} /* end GetMethodName */ 2770 2771 2772// method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2773// declaring_class_ptr - pre-checked for NULL 2774jvmtiError 2775JvmtiEnv::GetMethodDeclaringClass(Method* method_oop, jclass* declaring_class_ptr) { 2776 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2777 (*declaring_class_ptr) = get_jni_class_non_null(method_oop->method_holder()); 2778 return JVMTI_ERROR_NONE; 2779} /* end GetMethodDeclaringClass */ 2780 2781 2782// method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2783// modifiers_ptr - pre-checked for NULL 2784jvmtiError 2785JvmtiEnv::GetMethodModifiers(Method* method_oop, jint* modifiers_ptr) { 2786 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2787 (*modifiers_ptr) = method_oop->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; 2788 return JVMTI_ERROR_NONE; 2789} /* end GetMethodModifiers */ 2790 2791 2792// method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2793// max_ptr - pre-checked for NULL 2794jvmtiError 2795JvmtiEnv::GetMaxLocals(Method* method_oop, jint* max_ptr) { 2796 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2797 // get max stack 2798 (*max_ptr) = method_oop->max_locals(); 2799 return JVMTI_ERROR_NONE; 2800} /* end GetMaxLocals */ 2801 2802 2803// method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2804// size_ptr - pre-checked for NULL 2805jvmtiError 2806JvmtiEnv::GetArgumentsSize(Method* method_oop, jint* size_ptr) { 2807 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2808 // get size of arguments 2809 2810 (*size_ptr) = method_oop->size_of_parameters(); 2811 return JVMTI_ERROR_NONE; 2812} /* end GetArgumentsSize */ 2813 2814 2815// method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2816// entry_count_ptr - pre-checked for NULL 2817// table_ptr - pre-checked for NULL 2818jvmtiError 2819JvmtiEnv::GetLineNumberTable(Method* method_oop, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) { 2820 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2821 if (!method_oop->has_linenumber_table()) { 2822 return (JVMTI_ERROR_ABSENT_INFORMATION); 2823 } 2824 2825 // The line number table is compressed so we don't know how big it is until decompressed. 2826 // Decompression is really fast so we just do it twice. 2827 2828 // Compute size of table 2829 jint num_entries = 0; 2830 CompressedLineNumberReadStream stream(method_oop->compressed_linenumber_table()); 2831 while (stream.read_pair()) { 2832 num_entries++; 2833 } 2834 jvmtiLineNumberEntry *jvmti_table = 2835 (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry))); 2836 2837 // Fill jvmti table 2838 if (num_entries > 0) { 2839 int index = 0; 2840 CompressedLineNumberReadStream stream(method_oop->compressed_linenumber_table()); 2841 while (stream.read_pair()) { 2842 jvmti_table[index].start_location = (jlocation) stream.bci(); 2843 jvmti_table[index].line_number = (jint) stream.line(); 2844 index++; 2845 } 2846 assert(index == num_entries, "sanity check"); 2847 } 2848 2849 // Set up results 2850 (*entry_count_ptr) = num_entries; 2851 (*table_ptr) = jvmti_table; 2852 2853 return JVMTI_ERROR_NONE; 2854} /* end GetLineNumberTable */ 2855 2856 2857// method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2858// start_location_ptr - pre-checked for NULL 2859// end_location_ptr - pre-checked for NULL 2860jvmtiError 2861JvmtiEnv::GetMethodLocation(Method* method_oop, jlocation* start_location_ptr, jlocation* end_location_ptr) { 2862 2863 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2864 // get start and end location 2865 (*end_location_ptr) = (jlocation) (method_oop->code_size() - 1); 2866 if (method_oop->code_size() == 0) { 2867 // there is no code so there is no start location 2868 (*start_location_ptr) = (jlocation)(-1); 2869 } else { 2870 (*start_location_ptr) = (jlocation)(0); 2871 } 2872 2873 return JVMTI_ERROR_NONE; 2874} /* end GetMethodLocation */ 2875 2876 2877// method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2878// entry_count_ptr - pre-checked for NULL 2879// table_ptr - pre-checked for NULL 2880jvmtiError 2881JvmtiEnv::GetLocalVariableTable(Method* method_oop, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) { 2882 2883 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2884 JavaThread* current_thread = JavaThread::current(); 2885 2886 // does the klass have any local variable information? 2887 InstanceKlass* ik = method_oop->method_holder(); 2888 if (!ik->access_flags().has_localvariable_table()) { 2889 return (JVMTI_ERROR_ABSENT_INFORMATION); 2890 } 2891 2892 ConstantPool* constants = method_oop->constants(); 2893 NULL_CHECK(constants, JVMTI_ERROR_ABSENT_INFORMATION); 2894 2895 // in the vm localvariable table representation, 6 consecutive elements in the table 2896 // represent a 6-tuple of shorts 2897 // [start_pc, length, name_index, descriptor_index, signature_index, index] 2898 jint num_entries = method_oop->localvariable_table_length(); 2899 jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *) 2900 jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry))); 2901 2902 if (num_entries > 0) { 2903 LocalVariableTableElement* table = method_oop->localvariable_table_start(); 2904 for (int i = 0; i < num_entries; i++) { 2905 // get the 5 tuple information from the vm table 2906 jlocation start_location = (jlocation) table[i].start_bci; 2907 jint length = (jint) table[i].length; 2908 int name_index = (int) table[i].name_cp_index; 2909 int signature_index = (int) table[i].descriptor_cp_index; 2910 int generic_signature_index = (int) table[i].signature_cp_index; 2911 jint slot = (jint) table[i].slot; 2912 2913 // get utf8 name and signature 2914 char *name_buf = NULL; 2915 char *sig_buf = NULL; 2916 char *gen_sig_buf = NULL; 2917 { 2918 ResourceMark rm(current_thread); 2919 2920 const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8(); 2921 name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1); 2922 strcpy(name_buf, utf8_name); 2923 2924 const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8(); 2925 sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1); 2926 strcpy(sig_buf, utf8_signature); 2927 2928 if (generic_signature_index > 0) { 2929 const char *utf8_gen_sign = (const char *) 2930 constants->symbol_at(generic_signature_index)->as_utf8(); 2931 gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1); 2932 strcpy(gen_sig_buf, utf8_gen_sign); 2933 } 2934 } 2935 2936 // fill in the jvmti local variable table 2937 jvmti_table[i].start_location = start_location; 2938 jvmti_table[i].length = length; 2939 jvmti_table[i].name = name_buf; 2940 jvmti_table[i].signature = sig_buf; 2941 jvmti_table[i].generic_signature = gen_sig_buf; 2942 jvmti_table[i].slot = slot; 2943 } 2944 } 2945 2946 // set results 2947 (*entry_count_ptr) = num_entries; 2948 (*table_ptr) = jvmti_table; 2949 2950 return JVMTI_ERROR_NONE; 2951} /* end GetLocalVariableTable */ 2952 2953 2954// method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2955// bytecode_count_ptr - pre-checked for NULL 2956// bytecodes_ptr - pre-checked for NULL 2957jvmtiError 2958JvmtiEnv::GetBytecodes(Method* method_oop, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) { 2959 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2960 2961 HandleMark hm; 2962 methodHandle method(method_oop); 2963 jint size = (jint)method->code_size(); 2964 jvmtiError err = allocate(size, bytecodes_ptr); 2965 if (err != JVMTI_ERROR_NONE) { 2966 return err; 2967 } 2968 2969 (*bytecode_count_ptr) = size; 2970 // get byte codes 2971 JvmtiClassFileReconstituter::copy_bytecodes(method, *bytecodes_ptr); 2972 2973 return JVMTI_ERROR_NONE; 2974} /* end GetBytecodes */ 2975 2976 2977// method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2978// is_native_ptr - pre-checked for NULL 2979jvmtiError 2980JvmtiEnv::IsMethodNative(Method* method_oop, jboolean* is_native_ptr) { 2981 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2982 (*is_native_ptr) = method_oop->is_native(); 2983 return JVMTI_ERROR_NONE; 2984} /* end IsMethodNative */ 2985 2986 2987// method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2988// is_synthetic_ptr - pre-checked for NULL 2989jvmtiError 2990JvmtiEnv::IsMethodSynthetic(Method* method_oop, jboolean* is_synthetic_ptr) { 2991 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); 2992 (*is_synthetic_ptr) = method_oop->is_synthetic(); 2993 return JVMTI_ERROR_NONE; 2994} /* end IsMethodSynthetic */ 2995 2996 2997// method_oop - pre-checked for validity, but may be NULL meaning obsolete method 2998// is_obsolete_ptr - pre-checked for NULL 2999jvmtiError 3000JvmtiEnv::IsMethodObsolete(Method* method_oop, jboolean* is_obsolete_ptr) { 3001 if (use_version_1_0_semantics() && 3002 get_capabilities()->can_redefine_classes == 0) { 3003 // This JvmtiEnv requested version 1.0 semantics and this function 3004 // requires the can_redefine_classes capability in version 1.0 so 3005 // we need to return an error here. 3006 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY; 3007 } 3008 3009 if (method_oop == NULL || method_oop->is_obsolete()) { 3010 *is_obsolete_ptr = true; 3011 } else { 3012 *is_obsolete_ptr = false; 3013 } 3014 return JVMTI_ERROR_NONE; 3015} /* end IsMethodObsolete */ 3016 3017 // 3018 // Raw Monitor functions 3019 // 3020 3021// name - pre-checked for NULL 3022// monitor_ptr - pre-checked for NULL 3023jvmtiError 3024JvmtiEnv::CreateRawMonitor(const char* name, jrawMonitorID* monitor_ptr) { 3025 JvmtiRawMonitor* rmonitor = new JvmtiRawMonitor(name); 3026 NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY); 3027 3028 *monitor_ptr = (jrawMonitorID)rmonitor; 3029 3030 return JVMTI_ERROR_NONE; 3031} /* end CreateRawMonitor */ 3032 3033 3034// rmonitor - pre-checked for validity 3035jvmtiError 3036JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) { 3037 if (Threads::number_of_threads() == 0) { 3038 // Remove this monitor from pending raw monitors list 3039 // if it has entered in onload or start phase. 3040 JvmtiPendingMonitors::destroy(rmonitor); 3041 } else { 3042 Thread* thread = Thread::current(); 3043 if (rmonitor->is_entered(thread)) { 3044 // The caller owns this monitor which we are about to destroy. 3045 // We exit the underlying synchronization object so that the 3046 // "delete monitor" call below can work without an assertion 3047 // failure on systems that don't like destroying synchronization 3048 // objects that are locked. 3049 int r; 3050 intptr_t recursion = rmonitor->recursions(); 3051 for (intptr_t i=0; i <= recursion; i++) { 3052 r = rmonitor->raw_exit(thread); 3053 assert(r == ObjectMonitor::OM_OK, "raw_exit should have worked"); 3054 if (r != ObjectMonitor::OM_OK) { // robustness 3055 return JVMTI_ERROR_INTERNAL; 3056 } 3057 } 3058 } 3059 if (rmonitor->owner() != NULL) { 3060 // The caller is trying to destroy a monitor that is locked by 3061 // someone else. While this is not forbidden by the JVMTI 3062 // spec, it will cause an assertion failure on systems that don't 3063 // like destroying synchronization objects that are locked. 3064 // We indicate a problem with the error return (and leak the 3065 // monitor's memory). 3066 return JVMTI_ERROR_NOT_MONITOR_OWNER; 3067 } 3068 } 3069 3070 delete rmonitor; 3071 3072 return JVMTI_ERROR_NONE; 3073} /* end DestroyRawMonitor */ 3074 3075 3076// rmonitor - pre-checked for validity 3077jvmtiError 3078JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) { 3079 if (Threads::number_of_threads() == 0) { 3080 // No JavaThreads exist so ObjectMonitor enter cannot be 3081 // used, add this raw monitor to the pending list. 3082 // The pending monitors will be actually entered when 3083 // the VM is setup. 3084 // See transition_pending_raw_monitors in create_vm() 3085 // in thread.cpp. 3086 JvmtiPendingMonitors::enter(rmonitor); 3087 } else { 3088 int r = 0; 3089 Thread* thread = Thread::current(); 3090 3091 if (thread->is_Java_thread()) { 3092 JavaThread* current_thread = (JavaThread*)thread; 3093 3094#ifdef PROPER_TRANSITIONS 3095 // Not really unknown but ThreadInVMfromNative does more than we want 3096 ThreadInVMfromUnknown __tiv; 3097 { 3098 ThreadBlockInVM __tbivm(current_thread); 3099 r = rmonitor->raw_enter(current_thread); 3100 } 3101#else 3102 /* Transition to thread_blocked without entering vm state */ 3103 /* This is really evil. Normally you can't undo _thread_blocked */ 3104 /* transitions like this because it would cause us to miss a */ 3105 /* safepoint but since the thread was already in _thread_in_native */ 3106 /* the thread is not leaving a safepoint safe state and it will */ 3107 /* block when it tries to return from native. We can't safepoint */ 3108 /* block in here because we could deadlock the vmthread. Blech. */ 3109 3110 JavaThreadState state = current_thread->thread_state(); 3111 assert(state == _thread_in_native, "Must be _thread_in_native"); 3112 // frame should already be walkable since we are in native 3113 assert(!current_thread->has_last_Java_frame() || 3114 current_thread->frame_anchor()->walkable(), "Must be walkable"); 3115 current_thread->set_thread_state(_thread_blocked); 3116 3117 r = rmonitor->raw_enter(current_thread); 3118 // restore state, still at a safepoint safe state 3119 current_thread->set_thread_state(state); 3120 3121#endif /* PROPER_TRANSITIONS */ 3122 assert(r == ObjectMonitor::OM_OK, "raw_enter should have worked"); 3123 } else { 3124 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) { 3125 r = rmonitor->raw_enter(thread); 3126 } else { 3127 ShouldNotReachHere(); 3128 } 3129 } 3130 3131 if (r != ObjectMonitor::OM_OK) { // robustness 3132 return JVMTI_ERROR_INTERNAL; 3133 } 3134 } 3135 return JVMTI_ERROR_NONE; 3136} /* end RawMonitorEnter */ 3137 3138 3139// rmonitor - pre-checked for validity 3140jvmtiError 3141JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) { 3142 jvmtiError err = JVMTI_ERROR_NONE; 3143 3144 if (Threads::number_of_threads() == 0) { 3145 // No JavaThreads exist so just remove this monitor from the pending list. 3146 // Bool value from exit is false if rmonitor is not in the list. 3147 if (!JvmtiPendingMonitors::exit(rmonitor)) { 3148 err = JVMTI_ERROR_NOT_MONITOR_OWNER; 3149 } 3150 } else { 3151 int r = 0; 3152 Thread* thread = Thread::current(); 3153 3154 if (thread->is_Java_thread()) { 3155 JavaThread* current_thread = (JavaThread*)thread; 3156#ifdef PROPER_TRANSITIONS 3157 // Not really unknown but ThreadInVMfromNative does more than we want 3158 ThreadInVMfromUnknown __tiv; 3159#endif /* PROPER_TRANSITIONS */ 3160 r = rmonitor->raw_exit(current_thread); 3161 } else { 3162 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) { 3163 r = rmonitor->raw_exit(thread); 3164 } else { 3165 ShouldNotReachHere(); 3166 } 3167 } 3168 3169 if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) { 3170 err = JVMTI_ERROR_NOT_MONITOR_OWNER; 3171 } else { 3172 assert(r == ObjectMonitor::OM_OK, "raw_exit should have worked"); 3173 if (r != ObjectMonitor::OM_OK) { // robustness 3174 err = JVMTI_ERROR_INTERNAL; 3175 } 3176 } 3177 } 3178 return err; 3179} /* end RawMonitorExit */ 3180 3181 3182// rmonitor - pre-checked for validity 3183jvmtiError 3184JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) { 3185 int r = 0; 3186 Thread* thread = Thread::current(); 3187 3188 if (thread->is_Java_thread()) { 3189 JavaThread* current_thread = (JavaThread*)thread; 3190#ifdef PROPER_TRANSITIONS 3191 // Not really unknown but ThreadInVMfromNative does more than we want 3192 ThreadInVMfromUnknown __tiv; 3193 { 3194 ThreadBlockInVM __tbivm(current_thread); 3195 r = rmonitor->raw_wait(millis, true, current_thread); 3196 } 3197#else 3198 /* Transition to thread_blocked without entering vm state */ 3199 /* This is really evil. Normally you can't undo _thread_blocked */ 3200 /* transitions like this because it would cause us to miss a */ 3201 /* safepoint but since the thread was already in _thread_in_native */ 3202 /* the thread is not leaving a safepoint safe state and it will */ 3203 /* block when it tries to return from native. We can't safepoint */ 3204 /* block in here because we could deadlock the vmthread. Blech. */ 3205 3206 JavaThreadState state = current_thread->thread_state(); 3207 assert(state == _thread_in_native, "Must be _thread_in_native"); 3208 // frame should already be walkable since we are in native 3209 assert(!current_thread->has_last_Java_frame() || 3210 current_thread->frame_anchor()->walkable(), "Must be walkable"); 3211 current_thread->set_thread_state(_thread_blocked); 3212 3213 r = rmonitor->raw_wait(millis, true, current_thread); 3214 // restore state, still at a safepoint safe state 3215 current_thread->set_thread_state(state); 3216 3217#endif /* PROPER_TRANSITIONS */ 3218 } else { 3219 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) { 3220 r = rmonitor->raw_wait(millis, true, thread); 3221 } else { 3222 ShouldNotReachHere(); 3223 } 3224 } 3225 3226 switch (r) { 3227 case ObjectMonitor::OM_INTERRUPTED: 3228 return JVMTI_ERROR_INTERRUPT; 3229 case ObjectMonitor::OM_ILLEGAL_MONITOR_STATE: 3230 return JVMTI_ERROR_NOT_MONITOR_OWNER; 3231 } 3232 assert(r == ObjectMonitor::OM_OK, "raw_wait should have worked"); 3233 if (r != ObjectMonitor::OM_OK) { // robustness 3234 return JVMTI_ERROR_INTERNAL; 3235 } 3236 3237 return JVMTI_ERROR_NONE; 3238} /* end RawMonitorWait */ 3239 3240 3241// rmonitor - pre-checked for validity 3242jvmtiError 3243JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) { 3244 int r = 0; 3245 Thread* thread = Thread::current(); 3246 3247 if (thread->is_Java_thread()) { 3248 JavaThread* current_thread = (JavaThread*)thread; 3249 // Not really unknown but ThreadInVMfromNative does more than we want 3250 ThreadInVMfromUnknown __tiv; 3251 r = rmonitor->raw_notify(current_thread); 3252 } else { 3253 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) { 3254 r = rmonitor->raw_notify(thread); 3255 } else { 3256 ShouldNotReachHere(); 3257 } 3258 } 3259 3260 if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) { 3261 return JVMTI_ERROR_NOT_MONITOR_OWNER; 3262 } 3263 assert(r == ObjectMonitor::OM_OK, "raw_notify should have worked"); 3264 if (r != ObjectMonitor::OM_OK) { // robustness 3265 return JVMTI_ERROR_INTERNAL; 3266 } 3267 3268 return JVMTI_ERROR_NONE; 3269} /* end RawMonitorNotify */ 3270 3271 3272// rmonitor - pre-checked for validity 3273jvmtiError 3274JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) { 3275 int r = 0; 3276 Thread* thread = Thread::current(); 3277 3278 if (thread->is_Java_thread()) { 3279 JavaThread* current_thread = (JavaThread*)thread; 3280 ThreadInVMfromUnknown __tiv; 3281 r = rmonitor->raw_notifyAll(current_thread); 3282 } else { 3283 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) { 3284 r = rmonitor->raw_notifyAll(thread); 3285 } else { 3286 ShouldNotReachHere(); 3287 } 3288 } 3289 3290 if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) { 3291 return JVMTI_ERROR_NOT_MONITOR_OWNER; 3292 } 3293 assert(r == ObjectMonitor::OM_OK, "raw_notifyAll should have worked"); 3294 if (r != ObjectMonitor::OM_OK) { // robustness 3295 return JVMTI_ERROR_INTERNAL; 3296 } 3297 3298 return JVMTI_ERROR_NONE; 3299} /* end RawMonitorNotifyAll */ 3300 3301 3302 // 3303 // JNI Function Interception functions 3304 // 3305 3306 3307// function_table - pre-checked for NULL 3308jvmtiError 3309JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) { 3310 // Copy jni function table at safepoint. 3311 VM_JNIFunctionTableCopier copier(function_table); 3312 VMThread::execute(&copier); 3313 3314 return JVMTI_ERROR_NONE; 3315} /* end SetJNIFunctionTable */ 3316 3317 3318// function_table - pre-checked for NULL 3319jvmtiError 3320JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) { 3321 *function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface)); 3322 if (*function_table == NULL) 3323 return JVMTI_ERROR_OUT_OF_MEMORY; 3324 memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface)); 3325 return JVMTI_ERROR_NONE; 3326} /* end GetJNIFunctionTable */ 3327 3328 3329 // 3330 // Event Management functions 3331 // 3332 3333jvmtiError 3334JvmtiEnv::GenerateEvents(jvmtiEvent event_type) { 3335 // can only generate two event types 3336 if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD && 3337 event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) { 3338 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 3339 } 3340 3341 // for compiled_method_load events we must check that the environment 3342 // has the can_generate_compiled_method_load_events capability. 3343 if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) { 3344 if (get_capabilities()->can_generate_compiled_method_load_events == 0) { 3345 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY; 3346 } 3347 return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this); 3348 } else { 3349 return JvmtiCodeBlobEvents::generate_dynamic_code_events(this); 3350 } 3351 3352} /* end GenerateEvents */ 3353 3354 3355 // 3356 // Extension Mechanism functions 3357 // 3358 3359// extension_count_ptr - pre-checked for NULL 3360// extensions - pre-checked for NULL 3361jvmtiError 3362JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) { 3363 return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions); 3364} /* end GetExtensionFunctions */ 3365 3366 3367// extension_count_ptr - pre-checked for NULL 3368// extensions - pre-checked for NULL 3369jvmtiError 3370JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) { 3371 return JvmtiExtensions::get_events(this, extension_count_ptr, extensions); 3372} /* end GetExtensionEvents */ 3373 3374 3375// callback - NULL is a valid value, must be checked 3376jvmtiError 3377JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) { 3378 return JvmtiExtensions::set_event_callback(this, extension_event_index, callback); 3379} /* end SetExtensionEventCallback */ 3380 3381 // 3382 // Timers functions 3383 // 3384 3385// info_ptr - pre-checked for NULL 3386jvmtiError 3387JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) { 3388 os::current_thread_cpu_time_info(info_ptr); 3389 return JVMTI_ERROR_NONE; 3390} /* end GetCurrentThreadCpuTimerInfo */ 3391 3392 3393// nanos_ptr - pre-checked for NULL 3394jvmtiError 3395JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) { 3396 *nanos_ptr = os::current_thread_cpu_time(); 3397 return JVMTI_ERROR_NONE; 3398} /* end GetCurrentThreadCpuTime */ 3399 3400 3401// info_ptr - pre-checked for NULL 3402jvmtiError 3403JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) { 3404 os::thread_cpu_time_info(info_ptr); 3405 return JVMTI_ERROR_NONE; 3406} /* end GetThreadCpuTimerInfo */ 3407 3408 3409// Threads_lock NOT held, java_thread not protected by lock 3410// java_thread - pre-checked 3411// nanos_ptr - pre-checked for NULL 3412jvmtiError 3413JvmtiEnv::GetThreadCpuTime(JavaThread* java_thread, jlong* nanos_ptr) { 3414 *nanos_ptr = os::thread_cpu_time(java_thread); 3415 return JVMTI_ERROR_NONE; 3416} /* end GetThreadCpuTime */ 3417 3418 3419// info_ptr - pre-checked for NULL 3420jvmtiError 3421JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) { 3422 os::javaTimeNanos_info(info_ptr); 3423 return JVMTI_ERROR_NONE; 3424} /* end GetTimerInfo */ 3425 3426 3427// nanos_ptr - pre-checked for NULL 3428jvmtiError 3429JvmtiEnv::GetTime(jlong* nanos_ptr) { 3430 *nanos_ptr = os::javaTimeNanos(); 3431 return JVMTI_ERROR_NONE; 3432} /* end GetTime */ 3433 3434 3435// processor_count_ptr - pre-checked for NULL 3436jvmtiError 3437JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) { 3438 *processor_count_ptr = os::active_processor_count(); 3439 return JVMTI_ERROR_NONE; 3440} /* end GetAvailableProcessors */ 3441 3442 // 3443 // System Properties functions 3444 // 3445 3446// count_ptr - pre-checked for NULL 3447// property_ptr - pre-checked for NULL 3448jvmtiError 3449JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) { 3450 jvmtiError err = JVMTI_ERROR_NONE; 3451 3452 *count_ptr = Arguments::PropertyList_count(Arguments::system_properties()); 3453 3454 err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr); 3455 if (err != JVMTI_ERROR_NONE) { 3456 return err; 3457 } 3458 int i = 0 ; 3459 for (SystemProperty* p = Arguments::system_properties(); p != NULL && i < *count_ptr; p = p->next(), i++) { 3460 const char *key = p->key(); 3461 char **tmp_value = *property_ptr+i; 3462 err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value); 3463 if (err == JVMTI_ERROR_NONE) { 3464 strcpy(*tmp_value, key); 3465 } else { 3466 // clean up previously allocated memory. 3467 for (int j=0; j<i; j++) { 3468 Deallocate((unsigned char*)*property_ptr+j); 3469 } 3470 Deallocate((unsigned char*)property_ptr); 3471 break; 3472 } 3473 } 3474 return err; 3475} /* end GetSystemProperties */ 3476 3477 3478// property - pre-checked for NULL 3479// value_ptr - pre-checked for NULL 3480jvmtiError 3481JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) { 3482 jvmtiError err = JVMTI_ERROR_NONE; 3483 const char *value; 3484 3485 value = Arguments::PropertyList_get_value(Arguments::system_properties(), property); 3486 if (value == NULL) { 3487 err = JVMTI_ERROR_NOT_AVAILABLE; 3488 } else { 3489 err = allocate((strlen(value)+1) * sizeof(char), (unsigned char **)value_ptr); 3490 if (err == JVMTI_ERROR_NONE) { 3491 strcpy(*value_ptr, value); 3492 } 3493 } 3494 return err; 3495} /* end GetSystemProperty */ 3496 3497 3498// property - pre-checked for NULL 3499// value - NULL is a valid value, must be checked 3500jvmtiError 3501JvmtiEnv::SetSystemProperty(const char* property, const char* value_ptr) { 3502 jvmtiError err =JVMTI_ERROR_NOT_AVAILABLE; 3503 3504 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { 3505 if (strcmp(property, p->key()) == 0) { 3506 if (p->set_writeable_value(value_ptr)) { 3507 err = JVMTI_ERROR_NONE; 3508 } 3509 } 3510 } 3511 return err; 3512} /* end SetSystemProperty */ 3513