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