1 /*
   2  * Copyright (c) 2003, 2020, 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/javaClasses.inline.hpp"
  28 #include "classfile/stringTable.hpp"
  29 #include "classfile/modules.hpp"
  30 #include "classfile/systemDictionary.hpp"
  31 #include "classfile/vmSymbols.hpp"
  32 #include "interpreter/bytecodeStream.hpp"
  33 #include "interpreter/interpreter.hpp"
  34 #include "jfr/jfrEvents.hpp"
  35 #include "jvmtifiles/jvmtiEnv.hpp"
  36 #include "logging/log.hpp"
  37 #include "logging/logConfiguration.hpp"
  38 #include "memory/resourceArea.hpp"
  39 #include "memory/universe.hpp"
  40 #include "oops/instanceKlass.hpp"
  41 #include "oops/objArrayOop.inline.hpp"
  42 #include "oops/oop.inline.hpp"
  43 #include "prims/jniCheck.hpp"
  44 #include "prims/jvm_misc.hpp"
  45 #include "prims/jvmtiAgentThread.hpp"
  46 #include "prims/jvmtiClassFileReconstituter.hpp"
  47 #include "prims/jvmtiCodeBlobEvents.hpp"
  48 #include "prims/jvmtiExtensions.hpp"
  49 #include "prims/jvmtiGetLoadedClasses.hpp"
  50 #include "prims/jvmtiImpl.hpp"
  51 #include "prims/jvmtiManageCapabilities.hpp"
  52 #include "prims/jvmtiRawMonitor.hpp"
  53 #include "prims/jvmtiRedefineClasses.hpp"
  54 #include "prims/jvmtiTagMap.hpp"
  55 #include "prims/jvmtiThreadState.inline.hpp"
  56 #include "prims/jvmtiUtil.hpp"
  57 #include "runtime/arguments.hpp"
  58 #include "runtime/deoptimization.hpp"
  59 #include "runtime/fieldDescriptor.inline.hpp"
  60 #include "runtime/handles.inline.hpp"
  61 #include "runtime/interfaceSupport.inline.hpp"
  62 #include "runtime/javaCalls.hpp"
  63 #include "runtime/jfieldIDWorkaround.hpp"
  64 #include "runtime/jniHandles.inline.hpp"
  65 #include "runtime/objectMonitor.inline.hpp"
  66 #include "runtime/osThread.hpp"
  67 #include "runtime/reflectionUtils.hpp"
  68 #include "runtime/signature.hpp"
  69 #include "runtime/thread.inline.hpp"
  70 #include "runtime/threadHeapSampler.hpp"
  71 #include "runtime/threadSMR.hpp"
  72 #include "runtime/timerTrace.hpp"
  73 #include "runtime/vframe.inline.hpp"
  74 #include "runtime/vmThread.hpp"
  75 #include "services/threadService.hpp"
  76 #include "utilities/exceptions.hpp"
  77 #include "utilities/preserveException.hpp"
  78 #include "utilities/utf8.hpp"
  79 
  80 
  81 #define FIXLATER 0 // REMOVE this when completed.
  82 
  83  // FIXLATER: hook into JvmtiTrace
  84 #define TraceJVMTICalls false
  85 
  86 JvmtiEnv::JvmtiEnv(jint version) : JvmtiEnvBase(version) {
  87 }
  88 
  89 JvmtiEnv::~JvmtiEnv() {
  90 }
  91 
  92 JvmtiEnv*
  93 JvmtiEnv::create_a_jvmti(jint version) {
  94   return new JvmtiEnv(version);
  95 }
  96 
  97 // VM operation class to copy jni function table at safepoint.
  98 // More than one java threads or jvmti agents may be reading/
  99 // modifying jni function tables. To reduce the risk of bad
 100 // interaction b/w these threads it is copied at safepoint.
 101 class VM_JNIFunctionTableCopier : public VM_Operation {
 102  private:
 103   const struct JNINativeInterface_ *_function_table;
 104  public:
 105   VM_JNIFunctionTableCopier(const struct JNINativeInterface_ *func_tbl) {
 106     _function_table = func_tbl;
 107   };
 108 
 109   VMOp_Type type() const { return VMOp_JNIFunctionTableCopier; }
 110   void doit() {
 111     copy_jni_function_table(_function_table);
 112   };
 113 };
 114 
 115 //
 116 // Do not change the "prefix" marker below, everything above it is copied
 117 // unchanged into the filled stub, everything below is controlled by the
 118 // stub filler (only method bodies are carried forward, and then only for
 119 // functionality still in the spec).
 120 //
 121 // end file prefix
 122 
 123   //
 124   // Memory Management functions
 125   //
 126 
 127 // mem_ptr - pre-checked for NULL
 128 jvmtiError
 129 JvmtiEnv::Allocate(jlong size, unsigned char** mem_ptr) {
 130   return allocate(size, mem_ptr);
 131 } /* end Allocate */
 132 
 133 
 134 // mem - NULL is a valid value, must be checked
 135 jvmtiError
 136 JvmtiEnv::Deallocate(unsigned char* mem) {
 137   return deallocate(mem);
 138 } /* end Deallocate */
 139 
 140 // Threads_lock NOT held, java_thread not protected by lock
 141 // java_thread - pre-checked
 142 // data - NULL is a valid value, must be checked
 143 jvmtiError
 144 JvmtiEnv::SetThreadLocalStorage(JavaThread* java_thread, const void* data) {
 145   JvmtiThreadState* state = java_thread->jvmti_thread_state();
 146   if (state == NULL) {
 147     if (data == NULL) {
 148       // leaving state unset same as data set to NULL
 149       return JVMTI_ERROR_NONE;
 150     }
 151     // otherwise, create the state
 152     state = JvmtiThreadState::state_for(java_thread);
 153     if (state == NULL) {
 154       return JVMTI_ERROR_THREAD_NOT_ALIVE;
 155     }
 156   }
 157   state->env_thread_state(this)->set_agent_thread_local_storage_data((void*)data);
 158   return JVMTI_ERROR_NONE;
 159 } /* end SetThreadLocalStorage */
 160 
 161 
 162 // Threads_lock NOT held
 163 // thread - NOT pre-checked
 164 // data_ptr - pre-checked for NULL
 165 jvmtiError
 166 JvmtiEnv::GetThreadLocalStorage(jthread thread, void** data_ptr) {
 167   JavaThread* current_thread = JavaThread::current();
 168   if (thread == NULL) {
 169     JvmtiThreadState* state = current_thread->jvmti_thread_state();
 170     *data_ptr = (state == NULL) ? NULL :
 171       state->env_thread_state(this)->get_agent_thread_local_storage_data();
 172   } else {
 173     // jvmti_GetThreadLocalStorage is "in native" and doesn't transition
 174     // the thread to _thread_in_vm. However, when the TLS for a thread
 175     // other than the current thread is required we need to transition
 176     // from native so as to resolve the jthread.
 177 
 178     ThreadInVMfromNative __tiv(current_thread);
 179     VM_ENTRY_BASE(jvmtiError, JvmtiEnv::GetThreadLocalStorage , current_thread)
 180     debug_only(VMNativeEntryWrapper __vew;)
 181 
 182     JavaThread* java_thread = NULL;
 183     ThreadsListHandle tlh(current_thread);
 184     jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, NULL);
 185     if (err != JVMTI_ERROR_NONE) {
 186       return err;
 187     }
 188 
 189     JvmtiThreadState* state = java_thread->jvmti_thread_state();
 190     *data_ptr = (state == NULL) ? NULL :
 191       state->env_thread_state(this)->get_agent_thread_local_storage_data();
 192   }
 193   return JVMTI_ERROR_NONE;
 194 } /* end GetThreadLocalStorage */
 195 
 196   //
 197   // Module functions
 198   //
 199 
 200 // module_count_ptr - pre-checked for NULL
 201 // modules_ptr - pre-checked for NULL
 202 jvmtiError
 203 JvmtiEnv::GetAllModules(jint* module_count_ptr, jobject** modules_ptr) {
 204     JvmtiModuleClosure jmc;
 205 
 206     return jmc.get_all_modules(this, module_count_ptr, modules_ptr);
 207 } /* end GetAllModules */
 208 
 209 
 210 // class_loader - NULL is a valid value, must be pre-checked
 211 // package_name - pre-checked for NULL
 212 // module_ptr - pre-checked for NULL
 213 jvmtiError
 214 JvmtiEnv::GetNamedModule(jobject class_loader, const char* package_name, jobject* module_ptr) {
 215   JavaThread* THREAD = JavaThread::current(); // pass to macros
 216   ResourceMark rm(THREAD);
 217   Handle h_loader (THREAD, JNIHandles::resolve(class_loader));
 218   // Check that loader is a subclass of java.lang.ClassLoader.
 219   if (h_loader.not_null() && !java_lang_ClassLoader::is_subclass(h_loader->klass())) {
 220     return JVMTI_ERROR_ILLEGAL_ARGUMENT;
 221   }
 222   jobject module = Modules::get_named_module(h_loader, package_name, THREAD);
 223   if (HAS_PENDING_EXCEPTION) {
 224     CLEAR_PENDING_EXCEPTION;
 225     return JVMTI_ERROR_INTERNAL; // unexpected exception
 226   }
 227   *module_ptr = module;
 228   return JVMTI_ERROR_NONE;
 229 } /* end GetNamedModule */
 230 
 231 
 232 // module - pre-checked for NULL
 233 // to_module - pre-checked for NULL
 234 jvmtiError
 235 JvmtiEnv::AddModuleReads(jobject module, jobject to_module) {
 236   JavaThread* THREAD = JavaThread::current();
 237 
 238   // check module
 239   Handle h_module(THREAD, JNIHandles::resolve(module));
 240   if (!java_lang_Module::is_instance(h_module())) {
 241     return JVMTI_ERROR_INVALID_MODULE;
 242   }
 243   // check to_module
 244   Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
 245   if (!java_lang_Module::is_instance(h_to_module())) {
 246     return JVMTI_ERROR_INVALID_MODULE;
 247   }
 248   return JvmtiExport::add_module_reads(h_module, h_to_module, THREAD);
 249 } /* end AddModuleReads */
 250 
 251 
 252 // module - pre-checked for NULL
 253 // pkg_name - pre-checked for NULL
 254 // to_module - pre-checked for NULL
 255 jvmtiError
 256 JvmtiEnv::AddModuleExports(jobject module, const char* pkg_name, jobject to_module) {
 257   JavaThread* THREAD = JavaThread::current();
 258   Handle h_pkg = java_lang_String::create_from_str(pkg_name, THREAD);
 259 
 260   // check module
 261   Handle h_module(THREAD, JNIHandles::resolve(module));
 262   if (!java_lang_Module::is_instance(h_module())) {
 263     return JVMTI_ERROR_INVALID_MODULE;
 264   }
 265   // check to_module
 266   Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
 267   if (!java_lang_Module::is_instance(h_to_module())) {
 268     return JVMTI_ERROR_INVALID_MODULE;
 269   }
 270   return JvmtiExport::add_module_exports(h_module, h_pkg, h_to_module, THREAD);
 271 } /* end AddModuleExports */
 272 
 273 
 274 // module - pre-checked for NULL
 275 // pkg_name - pre-checked for NULL
 276 // to_module - pre-checked for NULL
 277 jvmtiError
 278 JvmtiEnv::AddModuleOpens(jobject module, const char* pkg_name, jobject to_module) {
 279   JavaThread* THREAD = JavaThread::current();
 280   Handle h_pkg = java_lang_String::create_from_str(pkg_name, THREAD);
 281 
 282   // check module
 283   Handle h_module(THREAD, JNIHandles::resolve(module));
 284   if (!java_lang_Module::is_instance(h_module())) {
 285     return JVMTI_ERROR_INVALID_MODULE;
 286   }
 287   // check to_module
 288   Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
 289   if (!java_lang_Module::is_instance(h_to_module())) {
 290     return JVMTI_ERROR_INVALID_MODULE;
 291   }
 292   return JvmtiExport::add_module_opens(h_module, h_pkg, h_to_module, THREAD);
 293 } /* end AddModuleOpens */
 294 
 295 
 296 // module - pre-checked for NULL
 297 // service - pre-checked for NULL
 298 jvmtiError
 299 JvmtiEnv::AddModuleUses(jobject module, jclass service) {
 300   JavaThread* THREAD = JavaThread::current();
 301 
 302   // check module
 303   Handle h_module(THREAD, JNIHandles::resolve(module));
 304   if (!java_lang_Module::is_instance(h_module())) {
 305     return JVMTI_ERROR_INVALID_MODULE;
 306   }
 307   // check service
 308   Handle h_service(THREAD, JNIHandles::resolve_external_guard(service));
 309   if (!java_lang_Class::is_instance(h_service()) ||
 310       java_lang_Class::is_primitive(h_service())) {
 311     return JVMTI_ERROR_INVALID_CLASS;
 312   }
 313   return JvmtiExport::add_module_uses(h_module, h_service, THREAD);
 314 } /* end AddModuleUses */
 315 
 316 
 317 // module - pre-checked for NULL
 318 // service - pre-checked for NULL
 319 // impl_class - pre-checked for NULL
 320 jvmtiError
 321 JvmtiEnv::AddModuleProvides(jobject module, jclass service, jclass impl_class) {
 322   JavaThread* THREAD = JavaThread::current();
 323 
 324   // check module
 325   Handle h_module(THREAD, JNIHandles::resolve(module));
 326   if (!java_lang_Module::is_instance(h_module())) {
 327     return JVMTI_ERROR_INVALID_MODULE;
 328   }
 329   // check service
 330   Handle h_service(THREAD, JNIHandles::resolve_external_guard(service));
 331   if (!java_lang_Class::is_instance(h_service()) ||
 332       java_lang_Class::is_primitive(h_service())) {
 333     return JVMTI_ERROR_INVALID_CLASS;
 334   }
 335   // check impl_class
 336   Handle h_impl_class(THREAD, JNIHandles::resolve_external_guard(impl_class));
 337   if (!java_lang_Class::is_instance(h_impl_class()) ||
 338       java_lang_Class::is_primitive(h_impl_class())) {
 339     return JVMTI_ERROR_INVALID_CLASS;
 340   }
 341   return JvmtiExport::add_module_provides(h_module, h_service, h_impl_class, THREAD);
 342 } /* end AddModuleProvides */
 343 
 344 // module - pre-checked for NULL
 345 // is_modifiable_class_ptr - pre-checked for NULL
 346 jvmtiError
 347 JvmtiEnv::IsModifiableModule(jobject module, jboolean* is_modifiable_module_ptr) {
 348   JavaThread* THREAD = JavaThread::current();
 349 
 350   // check module
 351   Handle h_module(THREAD, JNIHandles::resolve(module));
 352   if (!java_lang_Module::is_instance(h_module())) {
 353     return JVMTI_ERROR_INVALID_MODULE;
 354   }
 355 
 356   *is_modifiable_module_ptr = JNI_TRUE;
 357   return JVMTI_ERROR_NONE;
 358 } /* end IsModifiableModule */
 359 
 360 
 361   //
 362   // Class functions
 363   //
 364 
 365 // class_count_ptr - pre-checked for NULL
 366 // classes_ptr - pre-checked for NULL
 367 jvmtiError
 368 JvmtiEnv::GetLoadedClasses(jint* class_count_ptr, jclass** classes_ptr) {
 369   return JvmtiGetLoadedClasses::getLoadedClasses(this, class_count_ptr, classes_ptr);
 370 } /* end GetLoadedClasses */
 371 
 372 
 373 // initiating_loader - NULL is a valid value, must be checked
 374 // class_count_ptr - pre-checked for NULL
 375 // classes_ptr - pre-checked for NULL
 376 jvmtiError
 377 JvmtiEnv::GetClassLoaderClasses(jobject initiating_loader, jint* class_count_ptr, jclass** classes_ptr) {
 378   return JvmtiGetLoadedClasses::getClassLoaderClasses(this, initiating_loader,
 379                                                   class_count_ptr, classes_ptr);
 380 } /* end GetClassLoaderClasses */
 381 
 382 // k_mirror - may be primitive, this must be checked
 383 // is_modifiable_class_ptr - pre-checked for NULL
 384 jvmtiError
 385 JvmtiEnv::IsModifiableClass(oop k_mirror, jboolean* is_modifiable_class_ptr) {
 386   *is_modifiable_class_ptr = VM_RedefineClasses::is_modifiable_class(k_mirror)?
 387                                                        JNI_TRUE : JNI_FALSE;
 388   return JVMTI_ERROR_NONE;
 389 } /* end IsModifiableClass */
 390 
 391 // class_count - pre-checked to be greater than or equal to 0
 392 // classes - pre-checked for NULL
 393 jvmtiError
 394 JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) {
 395 //TODO: add locking
 396 
 397   int index;
 398   JavaThread* current_thread = JavaThread::current();
 399   ResourceMark rm(current_thread);
 400 
 401   jvmtiClassDefinition* class_definitions =
 402                             NEW_RESOURCE_ARRAY(jvmtiClassDefinition, class_count);
 403   NULL_CHECK(class_definitions, JVMTI_ERROR_OUT_OF_MEMORY);
 404 
 405   for (index = 0; index < class_count; index++) {
 406     HandleMark hm(current_thread);
 407 
 408     jclass jcls = classes[index];
 409     oop k_mirror = JNIHandles::resolve_external_guard(jcls);
 410     if (k_mirror == NULL) {
 411       return JVMTI_ERROR_INVALID_CLASS;
 412     }
 413     if (!k_mirror->is_a(SystemDictionary::Class_klass())) {
 414       return JVMTI_ERROR_INVALID_CLASS;
 415     }
 416 
 417     if (!VM_RedefineClasses::is_modifiable_class(k_mirror)) {
 418       return JVMTI_ERROR_UNMODIFIABLE_CLASS;
 419     }
 420 
 421     Klass* klass = java_lang_Class::as_Klass(k_mirror);
 422 
 423     jint status = klass->jvmti_class_status();
 424     if (status & (JVMTI_CLASS_STATUS_ERROR)) {
 425       return JVMTI_ERROR_INVALID_CLASS;
 426     }
 427 
 428     InstanceKlass* ik = InstanceKlass::cast(klass);
 429     if (ik->get_cached_class_file_bytes() == NULL) {
 430       // Not cached, we need to reconstitute the class file from the
 431       // VM representation. We don't attach the reconstituted class
 432       // bytes to the InstanceKlass here because they have not been
 433       // validated and we're not at a safepoint.
 434       JvmtiClassFileReconstituter reconstituter(ik);
 435       if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
 436         return reconstituter.get_error();
 437       }
 438 
 439       class_definitions[index].class_byte_count = (jint)reconstituter.class_file_size();
 440       class_definitions[index].class_bytes      = (unsigned char*)
 441                                                        reconstituter.class_file_bytes();
 442     } else {
 443       // it is cached, get it from the cache
 444       class_definitions[index].class_byte_count = ik->get_cached_class_file_len();
 445       class_definitions[index].class_bytes      = ik->get_cached_class_file_bytes();
 446     }
 447     class_definitions[index].klass              = jcls;
 448   }
 449   EventRetransformClasses event;
 450   VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
 451   VMThread::execute(&op);
 452   jvmtiError error = op.check_error();
 453   if (error == JVMTI_ERROR_NONE) {
 454     event.set_classCount(class_count);
 455     event.set_redefinitionId(op.id());
 456     event.commit();
 457   }
 458   return error;
 459 } /* end RetransformClasses */
 460 
 461 
 462 // class_count - pre-checked to be greater than or equal to 0
 463 // class_definitions - pre-checked for NULL
 464 jvmtiError
 465 JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_definitions) {
 466 //TODO: add locking
 467   EventRedefineClasses event;
 468   VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
 469   VMThread::execute(&op);
 470   jvmtiError error = op.check_error();
 471   if (error == JVMTI_ERROR_NONE) {
 472     event.set_classCount(class_count);
 473     event.set_redefinitionId(op.id());
 474     event.commit();
 475   }
 476   return error;
 477 } /* end RedefineClasses */
 478 
 479 
 480   //
 481   // Object functions
 482   //
 483 
 484 // size_ptr - pre-checked for NULL
 485 jvmtiError
 486 JvmtiEnv::GetObjectSize(jobject object, jlong* size_ptr) {
 487   oop mirror = JNIHandles::resolve_external_guard(object);
 488   NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
 489   *size_ptr = (jlong)Universe::heap()->obj_size(mirror) * wordSize;
 490   return JVMTI_ERROR_NONE;
 491 } /* end GetObjectSize */
 492 
 493   //
 494   // Method functions
 495   //
 496 
 497 // prefix - NULL is a valid value, must be checked
 498 jvmtiError
 499 JvmtiEnv::SetNativeMethodPrefix(const char* prefix) {
 500   return prefix == NULL?
 501               SetNativeMethodPrefixes(0, NULL) :
 502               SetNativeMethodPrefixes(1, (char**)&prefix);
 503 } /* end SetNativeMethodPrefix */
 504 
 505 
 506 // prefix_count - pre-checked to be greater than or equal to 0
 507 // prefixes - pre-checked for NULL
 508 jvmtiError
 509 JvmtiEnv::SetNativeMethodPrefixes(jint prefix_count, char** prefixes) {
 510   // Have to grab JVMTI thread state lock to be sure that some thread
 511   // isn't accessing the prefixes at the same time we are setting them.
 512   // No locks during VM bring-up.
 513   if (Threads::number_of_threads() == 0) {
 514     return set_native_method_prefixes(prefix_count, prefixes);
 515   } else {
 516     MutexLocker mu(JvmtiThreadState_lock);
 517     return set_native_method_prefixes(prefix_count, prefixes);
 518   }
 519 } /* end SetNativeMethodPrefixes */
 520 
 521   //
 522   // Event Management functions
 523   //
 524 
 525 // callbacks - NULL is a valid value, must be checked
 526 // size_of_callbacks - pre-checked to be greater than or equal to 0
 527 jvmtiError
 528 JvmtiEnv::SetEventCallbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks) {
 529   JvmtiEventController::set_event_callbacks(this, callbacks, size_of_callbacks);
 530   return JVMTI_ERROR_NONE;
 531 } /* end SetEventCallbacks */
 532 
 533 
 534 // event_thread - NULL is a valid value, must be checked
 535 jvmtiError
 536 JvmtiEnv::SetEventNotificationMode(jvmtiEventMode mode, jvmtiEvent event_type, jthread event_thread,   ...) {
 537   if (event_thread == NULL) {
 538     // Can be called at Agent_OnLoad() time with event_thread == NULL
 539     // when Thread::current() does not work yet so we cannot create a
 540     // ThreadsListHandle that is common to both thread-specific and
 541     // global code paths.
 542 
 543     // event_type must be valid
 544     if (!JvmtiEventController::is_valid_event_type(event_type)) {
 545       return JVMTI_ERROR_INVALID_EVENT_TYPE;
 546     }
 547 
 548     bool enabled = (mode == JVMTI_ENABLE);
 549 
 550     // assure that needed capabilities are present
 551     if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) {
 552       return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
 553     }
 554 
 555     if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) {
 556       record_class_file_load_hook_enabled();
 557     }
 558 
 559     JvmtiEventController::set_user_enabled(this, (JavaThread*) NULL, event_type, enabled);
 560   } else {
 561     // We have a specified event_thread.
 562     JavaThread* java_thread = NULL;
 563     ThreadsListHandle tlh;
 564     jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), event_thread, &java_thread, NULL);
 565     if (err != JVMTI_ERROR_NONE) {
 566       return err;
 567     }
 568 
 569     // event_type must be valid
 570     if (!JvmtiEventController::is_valid_event_type(event_type)) {
 571       return JVMTI_ERROR_INVALID_EVENT_TYPE;
 572     }
 573 
 574     // global events cannot be controlled at thread level.
 575     if (JvmtiEventController::is_global_event(event_type)) {
 576       return JVMTI_ERROR_ILLEGAL_ARGUMENT;
 577     }
 578 
 579     bool enabled = (mode == JVMTI_ENABLE);
 580 
 581     // assure that needed capabilities are present
 582     if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) {
 583       return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
 584     }
 585 
 586     if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) {
 587       record_class_file_load_hook_enabled();
 588     }
 589     JvmtiEventController::set_user_enabled(this, java_thread, event_type, enabled);
 590   }
 591 
 592   return JVMTI_ERROR_NONE;
 593 } /* end SetEventNotificationMode */
 594 
 595   //
 596   // Capability functions
 597   //
 598 
 599 // capabilities_ptr - pre-checked for NULL
 600 jvmtiError
 601 JvmtiEnv::GetPotentialCapabilities(jvmtiCapabilities* capabilities_ptr) {
 602   JvmtiManageCapabilities::get_potential_capabilities(get_capabilities(),
 603                                                       get_prohibited_capabilities(),
 604                                                       capabilities_ptr);
 605   return JVMTI_ERROR_NONE;
 606 } /* end GetPotentialCapabilities */
 607 
 608 
 609 // capabilities_ptr - pre-checked for NULL
 610 jvmtiError
 611 JvmtiEnv::AddCapabilities(const jvmtiCapabilities* capabilities_ptr) {
 612   return JvmtiManageCapabilities::add_capabilities(get_capabilities(),
 613                                                    get_prohibited_capabilities(),
 614                                                    capabilities_ptr,
 615                                                    get_capabilities());
 616 } /* end AddCapabilities */
 617 
 618 
 619 // capabilities_ptr - pre-checked for NULL
 620 jvmtiError
 621 JvmtiEnv::RelinquishCapabilities(const jvmtiCapabilities* capabilities_ptr) {
 622   JvmtiManageCapabilities::relinquish_capabilities(get_capabilities(), capabilities_ptr, get_capabilities());
 623   return JVMTI_ERROR_NONE;
 624 } /* end RelinquishCapabilities */
 625 
 626 
 627 // capabilities_ptr - pre-checked for NULL
 628 jvmtiError
 629 JvmtiEnv::GetCapabilities(jvmtiCapabilities* capabilities_ptr) {
 630   JvmtiManageCapabilities::copy_capabilities(get_capabilities(), capabilities_ptr);
 631   return JVMTI_ERROR_NONE;
 632 } /* end GetCapabilities */
 633 
 634   //
 635   // Class Loader Search functions
 636   //
 637 
 638 // segment - pre-checked for NULL
 639 jvmtiError
 640 JvmtiEnv::AddToBootstrapClassLoaderSearch(const char* segment) {
 641   jvmtiPhase phase = get_phase();
 642   if (phase == JVMTI_PHASE_ONLOAD) {
 643     Arguments::append_sysclasspath(segment);
 644     return JVMTI_ERROR_NONE;
 645   } else if (use_version_1_0_semantics()) {
 646     // This JvmtiEnv requested version 1.0 semantics and this function
 647     // is only allowed in the ONLOAD phase in version 1.0 so we need to
 648     // return an error here.
 649     return JVMTI_ERROR_WRONG_PHASE;
 650   } else if (phase == JVMTI_PHASE_LIVE) {
 651     // The phase is checked by the wrapper that called this function,
 652     // but this thread could be racing with the thread that is
 653     // terminating the VM so we check one more time.
 654 
 655     // create the zip entry
 656     ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment, true);
 657     if (zip_entry == NULL) {
 658       return JVMTI_ERROR_ILLEGAL_ARGUMENT;
 659     }
 660 
 661     // lock the loader
 662     Thread* thread = Thread::current();
 663     HandleMark hm;
 664     Handle loader_lock = Handle(thread, SystemDictionary::system_loader_lock());
 665 
 666     ObjectLocker ol(loader_lock, thread);
 667 
 668     // add the jar file to the bootclasspath
 669     log_info(class, load)("opened: %s", zip_entry->name());
 670 #if INCLUDE_CDS
 671     ClassLoaderExt::append_boot_classpath(zip_entry);
 672 #else
 673     ClassLoader::add_to_boot_append_entries(zip_entry);
 674 #endif
 675     return JVMTI_ERROR_NONE;
 676   } else {
 677     return JVMTI_ERROR_WRONG_PHASE;
 678   }
 679 
 680 } /* end AddToBootstrapClassLoaderSearch */
 681 
 682 
 683 // segment - pre-checked for NULL
 684 jvmtiError
 685 JvmtiEnv::AddToSystemClassLoaderSearch(const char* segment) {
 686   jvmtiPhase phase = get_phase();
 687 
 688   if (phase == JVMTI_PHASE_ONLOAD) {
 689     for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
 690       if (strcmp("java.class.path", p->key()) == 0) {
 691         p->append_value(segment);
 692         break;
 693       }
 694     }
 695     return JVMTI_ERROR_NONE;
 696   } else if (phase == JVMTI_PHASE_LIVE) {
 697     // The phase is checked by the wrapper that called this function,
 698     // but this thread could be racing with the thread that is
 699     // terminating the VM so we check one more time.
 700     HandleMark hm;
 701 
 702     // create the zip entry (which will open the zip file and hence
 703     // check that the segment is indeed a zip file).
 704     ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment, false);
 705     if (zip_entry == NULL) {
 706       return JVMTI_ERROR_ILLEGAL_ARGUMENT;
 707     }
 708     delete zip_entry;   // no longer needed
 709 
 710     // lock the loader
 711     Thread* THREAD = Thread::current();
 712     Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
 713 
 714     ObjectLocker ol(loader, THREAD);
 715 
 716     // need the path as java.lang.String
 717     Handle path = java_lang_String::create_from_platform_dependent_str(segment, THREAD);
 718     if (HAS_PENDING_EXCEPTION) {
 719       CLEAR_PENDING_EXCEPTION;
 720       return JVMTI_ERROR_INTERNAL;
 721     }
 722 
 723     // Invoke the appendToClassPathForInstrumentation method - if the method
 724     // is not found it means the loader doesn't support adding to the class path
 725     // in the live phase.
 726     {
 727       JavaValue res(T_VOID);
 728       JavaCalls::call_special(&res,
 729                               loader,
 730                               loader->klass(),
 731                               vmSymbols::appendToClassPathForInstrumentation_name(),
 732                               vmSymbols::appendToClassPathForInstrumentation_signature(),
 733                               path,
 734                               THREAD);
 735       if (HAS_PENDING_EXCEPTION) {
 736         Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
 737         CLEAR_PENDING_EXCEPTION;
 738 
 739         if (ex_name == vmSymbols::java_lang_NoSuchMethodError()) {
 740           return JVMTI_ERROR_CLASS_LOADER_UNSUPPORTED;
 741         } else {
 742           return JVMTI_ERROR_INTERNAL;
 743         }
 744       }
 745     }
 746 
 747     return JVMTI_ERROR_NONE;
 748   } else {
 749     return JVMTI_ERROR_WRONG_PHASE;
 750   }
 751 } /* end AddToSystemClassLoaderSearch */
 752 
 753   //
 754   // General functions
 755   //
 756 
 757 // phase_ptr - pre-checked for NULL
 758 jvmtiError
 759 JvmtiEnv::GetPhase(jvmtiPhase* phase_ptr) {
 760   *phase_ptr = phase();
 761   return JVMTI_ERROR_NONE;
 762 } /* end GetPhase */
 763 
 764 
 765 jvmtiError
 766 JvmtiEnv::DisposeEnvironment() {
 767   dispose();
 768   return JVMTI_ERROR_NONE;
 769 } /* end DisposeEnvironment */
 770 
 771 
 772 // data - NULL is a valid value, must be checked
 773 jvmtiError
 774 JvmtiEnv::SetEnvironmentLocalStorage(const void* data) {
 775   set_env_local_storage(data);
 776   return JVMTI_ERROR_NONE;
 777 } /* end SetEnvironmentLocalStorage */
 778 
 779 
 780 // data_ptr - pre-checked for NULL
 781 jvmtiError
 782 JvmtiEnv::GetEnvironmentLocalStorage(void** data_ptr) {
 783   *data_ptr = (void*)get_env_local_storage();
 784   return JVMTI_ERROR_NONE;
 785 } /* end GetEnvironmentLocalStorage */
 786 
 787 // version_ptr - pre-checked for NULL
 788 jvmtiError
 789 JvmtiEnv::GetVersionNumber(jint* version_ptr) {
 790   *version_ptr = JVMTI_VERSION;
 791   return JVMTI_ERROR_NONE;
 792 } /* end GetVersionNumber */
 793 
 794 
 795 // name_ptr - pre-checked for NULL
 796 jvmtiError
 797 JvmtiEnv::GetErrorName(jvmtiError error, char** name_ptr) {
 798   if (error < JVMTI_ERROR_NONE || error > JVMTI_ERROR_MAX) {
 799     return JVMTI_ERROR_ILLEGAL_ARGUMENT;
 800   }
 801   const char *name = JvmtiUtil::error_name(error);
 802   if (name == NULL) {
 803     return JVMTI_ERROR_ILLEGAL_ARGUMENT;
 804   }
 805   size_t len = strlen(name) + 1;
 806   jvmtiError err = allocate(len, (unsigned char**)name_ptr);
 807   if (err == JVMTI_ERROR_NONE) {
 808     memcpy(*name_ptr, name, len);
 809   }
 810   return err;
 811 } /* end GetErrorName */
 812 
 813 
 814 jvmtiError
 815 JvmtiEnv::SetVerboseFlag(jvmtiVerboseFlag flag, jboolean value) {
 816   LogLevelType level = value == 0 ? LogLevel::Off : LogLevel::Info;
 817   switch (flag) {
 818   case JVMTI_VERBOSE_OTHER:
 819     // ignore
 820     break;
 821   case JVMTI_VERBOSE_CLASS:
 822     LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, unload));
 823     LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, load));
 824     break;
 825   case JVMTI_VERBOSE_GC:
 826     LogConfiguration::configure_stdout(level, true, LOG_TAGS(gc));
 827     break;
 828   case JVMTI_VERBOSE_JNI:
 829     level = value == 0 ? LogLevel::Off : LogLevel::Debug;
 830     LogConfiguration::configure_stdout(level, true, LOG_TAGS(jni, resolve));
 831     break;
 832   default:
 833     return JVMTI_ERROR_ILLEGAL_ARGUMENT;
 834   };
 835   return JVMTI_ERROR_NONE;
 836 } /* end SetVerboseFlag */
 837 
 838 
 839 // format_ptr - pre-checked for NULL
 840 jvmtiError
 841 JvmtiEnv::GetJLocationFormat(jvmtiJlocationFormat* format_ptr) {
 842   *format_ptr = JVMTI_JLOCATION_JVMBCI;
 843   return JVMTI_ERROR_NONE;
 844 } /* end GetJLocationFormat */
 845 
 846   //
 847   // Thread functions
 848   //
 849 
 850 // Threads_lock NOT held
 851 // thread - NOT pre-checked
 852 // thread_state_ptr - pre-checked for NULL
 853 jvmtiError
 854 JvmtiEnv::GetThreadState(jthread thread, jint* thread_state_ptr) {
 855   JavaThread* current_thread = JavaThread::current();
 856   JavaThread* java_thread = NULL;
 857   oop thread_oop = NULL;
 858   ThreadsListHandle tlh(current_thread);
 859 
 860   if (thread == NULL) {
 861     java_thread = current_thread;
 862     thread_oop = java_thread->threadObj();
 863 
 864     if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) {
 865       return JVMTI_ERROR_INVALID_THREAD;
 866     }
 867   } else {
 868     jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
 869     if (err != JVMTI_ERROR_NONE) {
 870       // We got an error code so we don't have a JavaThread *, but
 871       // only return an error from here if we didn't get a valid
 872       // thread_oop.
 873       if (thread_oop == NULL) {
 874         return err;
 875       }
 876       // We have a valid thread_oop so we can return some thread state.
 877     }
 878   }
 879 
 880   // get most state bits
 881   jint state = (jint)java_lang_Thread::get_thread_status(thread_oop);
 882 
 883   if (java_thread != NULL) {
 884     // We have a JavaThread* so add more state bits.
 885     JavaThreadState jts = java_thread->thread_state();
 886 
 887     if (java_thread->is_being_ext_suspended()) {
 888       state |= JVMTI_THREAD_STATE_SUSPENDED;
 889     }
 890     if (jts == _thread_in_native) {
 891       state |= JVMTI_THREAD_STATE_IN_NATIVE;
 892     }
 893     if (java_thread->is_interrupted(false)) {
 894       state |= JVMTI_THREAD_STATE_INTERRUPTED;
 895     }
 896   }
 897 
 898   *thread_state_ptr = state;
 899   return JVMTI_ERROR_NONE;
 900 } /* end GetThreadState */
 901 
 902 
 903 // thread_ptr - pre-checked for NULL
 904 jvmtiError
 905 JvmtiEnv::GetCurrentThread(jthread* thread_ptr) {
 906   JavaThread* current_thread  = JavaThread::current();
 907   *thread_ptr = (jthread)JNIHandles::make_local(current_thread, current_thread->threadObj());
 908   return JVMTI_ERROR_NONE;
 909 } /* end GetCurrentThread */
 910 
 911 
 912 // threads_count_ptr - pre-checked for NULL
 913 // threads_ptr - pre-checked for NULL
 914 jvmtiError
 915 JvmtiEnv::GetAllThreads(jint* threads_count_ptr, jthread** threads_ptr) {
 916   int nthreads        = 0;
 917   Handle *thread_objs = NULL;
 918   ResourceMark rm;
 919   HandleMark hm;
 920 
 921   // enumerate threads (including agent threads)
 922   ThreadsListEnumerator tle(Thread::current(), true);
 923   nthreads = tle.num_threads();
 924   *threads_count_ptr = nthreads;
 925 
 926   if (nthreads == 0) {
 927     *threads_ptr = NULL;
 928     return JVMTI_ERROR_NONE;
 929   }
 930 
 931   thread_objs = NEW_RESOURCE_ARRAY(Handle, nthreads);
 932   NULL_CHECK(thread_objs, JVMTI_ERROR_OUT_OF_MEMORY);
 933 
 934   for (int i = 0; i < nthreads; i++) {
 935     thread_objs[i] = Handle(tle.get_threadObj(i));
 936   }
 937 
 938   jthread *jthreads  = new_jthreadArray(nthreads, thread_objs);
 939   NULL_CHECK(jthreads, JVMTI_ERROR_OUT_OF_MEMORY);
 940 
 941   *threads_ptr = jthreads;
 942   return JVMTI_ERROR_NONE;
 943 } /* end GetAllThreads */
 944 
 945 
 946 // Threads_lock NOT held, java_thread not protected by lock
 947 // java_thread - pre-checked
 948 jvmtiError
 949 JvmtiEnv::SuspendThread(JavaThread* java_thread) {
 950   // don't allow hidden thread suspend request.
 951   if (java_thread->is_hidden_from_external_view()) {
 952     return (JVMTI_ERROR_NONE);
 953   }
 954 
 955   {
 956     MutexLocker ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag);
 957     if (java_thread->is_external_suspend()) {
 958       // don't allow nested external suspend requests.
 959       return (JVMTI_ERROR_THREAD_SUSPENDED);
 960     }
 961     if (java_thread->is_exiting()) { // thread is in the process of exiting
 962       return (JVMTI_ERROR_THREAD_NOT_ALIVE);
 963     }
 964     java_thread->set_external_suspend();
 965   }
 966 
 967   if (!JvmtiSuspendControl::suspend(java_thread)) {
 968     // the thread was in the process of exiting
 969     return (JVMTI_ERROR_THREAD_NOT_ALIVE);
 970   }
 971   return JVMTI_ERROR_NONE;
 972 } /* end SuspendThread */
 973 
 974 
 975 // request_count - pre-checked to be greater than or equal to 0
 976 // request_list - pre-checked for NULL
 977 // results - pre-checked for NULL
 978 jvmtiError
 979 JvmtiEnv::SuspendThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
 980   int needSafepoint = 0;  // > 0 if we need a safepoint
 981   ThreadsListHandle tlh;
 982   for (int i = 0; i < request_count; i++) {
 983     JavaThread *java_thread = NULL;
 984     jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), request_list[i], &java_thread, NULL);
 985     if (err != JVMTI_ERROR_NONE) {
 986       results[i] = err;
 987       continue;
 988     }
 989     // don't allow hidden thread suspend request.
 990     if (java_thread->is_hidden_from_external_view()) {
 991       results[i] = JVMTI_ERROR_NONE;  // indicate successful suspend
 992       continue;
 993     }
 994 
 995     {
 996       MutexLocker ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag);
 997       if (java_thread->is_external_suspend()) {
 998         // don't allow nested external suspend requests.
 999         results[i] = JVMTI_ERROR_THREAD_SUSPENDED;
1000         continue;
1001       }
1002       if (java_thread->is_exiting()) { // thread is in the process of exiting
1003         results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
1004         continue;
1005       }
1006       java_thread->set_external_suspend();
1007     }
1008     if (java_thread->thread_state() == _thread_in_native) {
1009       // We need to try and suspend native threads here. Threads in
1010       // other states will self-suspend on their next transition.
1011       if (!JvmtiSuspendControl::suspend(java_thread)) {
1012         // The thread was in the process of exiting. Force another
1013         // safepoint to make sure that this thread transitions.
1014         needSafepoint++;
1015         results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
1016         continue;
1017       }
1018     } else {
1019       needSafepoint++;
1020     }
1021     results[i] = JVMTI_ERROR_NONE;  // indicate successful suspend
1022   }
1023   if (needSafepoint > 0) {
1024     VM_ThreadsSuspendJVMTI tsj;
1025     VMThread::execute(&tsj);
1026   }
1027   // per-thread suspend results returned via results parameter
1028   return JVMTI_ERROR_NONE;
1029 } /* end SuspendThreadList */
1030 
1031 
1032 // Threads_lock NOT held, java_thread not protected by lock
1033 // java_thread - pre-checked
1034 jvmtiError
1035 JvmtiEnv::ResumeThread(JavaThread* java_thread) {
1036   // don't allow hidden thread resume request.
1037   if (java_thread->is_hidden_from_external_view()) {
1038     return JVMTI_ERROR_NONE;
1039   }
1040 
1041   if (!java_thread->is_being_ext_suspended()) {
1042     return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1043   }
1044 
1045   if (!JvmtiSuspendControl::resume(java_thread)) {
1046     return JVMTI_ERROR_INTERNAL;
1047   }
1048   return JVMTI_ERROR_NONE;
1049 } /* end ResumeThread */
1050 
1051 
1052 // request_count - pre-checked to be greater than or equal to 0
1053 // request_list - pre-checked for NULL
1054 // results - pre-checked for NULL
1055 jvmtiError
1056 JvmtiEnv::ResumeThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
1057   ThreadsListHandle tlh;
1058   for (int i = 0; i < request_count; i++) {
1059     JavaThread* java_thread = NULL;
1060     jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), request_list[i], &java_thread, NULL);
1061     if (err != JVMTI_ERROR_NONE) {
1062       results[i] = err;
1063       continue;
1064     }
1065     // don't allow hidden thread resume request.
1066     if (java_thread->is_hidden_from_external_view()) {
1067       results[i] = JVMTI_ERROR_NONE;  // indicate successful resume
1068       continue;
1069     }
1070     if (!java_thread->is_being_ext_suspended()) {
1071       results[i] = JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1072       continue;
1073     }
1074 
1075     if (!JvmtiSuspendControl::resume(java_thread)) {
1076       results[i] = JVMTI_ERROR_INTERNAL;
1077       continue;
1078     }
1079 
1080     results[i] = JVMTI_ERROR_NONE;  // indicate successful resume
1081   }
1082   // per-thread resume results returned via results parameter
1083   return JVMTI_ERROR_NONE;
1084 } /* end ResumeThreadList */
1085 
1086 
1087 // Threads_lock NOT held, java_thread not protected by lock
1088 // java_thread - pre-checked
1089 jvmtiError
1090 JvmtiEnv::StopThread(JavaThread* java_thread, jobject exception) {
1091   oop e = JNIHandles::resolve_external_guard(exception);
1092   NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER);
1093 
1094   JavaThread::send_async_exception(java_thread->threadObj(), e);
1095 
1096   return JVMTI_ERROR_NONE;
1097 
1098 } /* end StopThread */
1099 
1100 
1101 // Threads_lock NOT held
1102 // thread - NOT pre-checked
1103 jvmtiError
1104 JvmtiEnv::InterruptThread(jthread thread) {
1105   JavaThread* current_thread  = JavaThread::current();
1106   JavaThread* java_thread = NULL;
1107   ThreadsListHandle tlh(current_thread);
1108   jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, NULL);
1109   if (err != JVMTI_ERROR_NONE) {
1110     return err;
1111   }
1112   // Really this should be a Java call to Thread.interrupt to ensure the same
1113   // semantics, however historically this has not been done for some reason.
1114   // So we continue with that (which means we don't interact with any Java-level
1115   // Interruptible object) but we must set the Java-level interrupted state.
1116   java_lang_Thread::set_interrupted(JNIHandles::resolve(thread), true);
1117   java_thread->interrupt();
1118 
1119   return JVMTI_ERROR_NONE;
1120 } /* end InterruptThread */
1121 
1122 
1123 // Threads_lock NOT held
1124 // thread - NOT pre-checked
1125 // info_ptr - pre-checked for NULL
1126 jvmtiError
1127 JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) {
1128   ResourceMark rm;
1129   HandleMark hm;
1130 
1131   JavaThread* current_thread = JavaThread::current();
1132   ThreadsListHandle tlh(current_thread);
1133 
1134   // if thread is NULL the current thread is used
1135   oop thread_oop = NULL;
1136   if (thread == NULL) {
1137     thread_oop = current_thread->threadObj();
1138     if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) {
1139       return JVMTI_ERROR_INVALID_THREAD;
1140     }
1141   } else {
1142     JavaThread* java_thread = NULL;
1143     jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1144     if (err != JVMTI_ERROR_NONE) {
1145       // We got an error code so we don't have a JavaThread *, but
1146       // only return an error from here if we didn't get a valid
1147       // thread_oop.
1148       if (thread_oop == NULL) {
1149         return err;
1150       }
1151       // We have a valid thread_oop so we can return some thread info.
1152     }
1153   }
1154 
1155   Handle thread_obj(current_thread, thread_oop);
1156   Handle name;
1157   ThreadPriority priority;
1158   Handle     thread_group;
1159   Handle context_class_loader;
1160   bool          is_daemon;
1161 
1162   name = Handle(current_thread, java_lang_Thread::name(thread_obj()));
1163   priority = java_lang_Thread::priority(thread_obj());
1164   thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj()));
1165   is_daemon = java_lang_Thread::is_daemon(thread_obj());
1166 
1167   oop loader = java_lang_Thread::context_class_loader(thread_obj());
1168   context_class_loader = Handle(current_thread, loader);
1169 
1170   { const char *n;
1171 
1172     if (name() != NULL) {
1173       n = java_lang_String::as_utf8_string(name());
1174     } else {
1175       int utf8_length = 0;
1176       n = UNICODE::as_utf8((jchar*) NULL, utf8_length);
1177     }
1178 
1179     info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1);
1180     if (info_ptr->name == NULL)
1181       return JVMTI_ERROR_OUT_OF_MEMORY;
1182 
1183     strcpy(info_ptr->name, n);
1184   }
1185   info_ptr->is_daemon = is_daemon;
1186   info_ptr->priority  = priority;
1187 
1188   info_ptr->context_class_loader = (context_class_loader.is_null()) ? NULL :
1189                                      jni_reference(context_class_loader);
1190   info_ptr->thread_group = jni_reference(thread_group);
1191 
1192   return JVMTI_ERROR_NONE;
1193 } /* end GetThreadInfo */
1194 
1195 
1196 // Threads_lock NOT held, java_thread not protected by lock
1197 // java_thread - pre-checked
1198 // owned_monitor_count_ptr - pre-checked for NULL
1199 // owned_monitors_ptr - pre-checked for NULL
1200 jvmtiError
1201 JvmtiEnv::GetOwnedMonitorInfo(JavaThread* java_thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
1202   jvmtiError err = JVMTI_ERROR_NONE;
1203   JavaThread* calling_thread = JavaThread::current();
1204 
1205   // growable array of jvmti monitors info on the C-heap
1206   GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1207       new (ResourceObj::C_HEAP, mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1208 
1209   // It is only safe to perform the direct operation on the current
1210   // thread. All other usage needs to use a direct handshake for safety.
1211   if (java_thread == calling_thread) {
1212     err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1213   } else {
1214     // get owned monitors info with handshake
1215     GetOwnedMonitorInfoClosure op(calling_thread, this, owned_monitors_list);
1216     bool executed = Handshake::execute_direct(&op, java_thread);
1217     err = executed ? op.result() : JVMTI_ERROR_THREAD_NOT_ALIVE;
1218   }
1219   jint owned_monitor_count = owned_monitors_list->length();
1220   if (err == JVMTI_ERROR_NONE) {
1221     if ((err = allocate(owned_monitor_count * sizeof(jobject *),
1222                       (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) {
1223       // copy into the returned array
1224       for (int i = 0; i < owned_monitor_count; i++) {
1225         (*owned_monitors_ptr)[i] =
1226           ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1227       }
1228       *owned_monitor_count_ptr = owned_monitor_count;
1229     }
1230   }
1231   // clean up.
1232   for (int i = 0; i < owned_monitor_count; i++) {
1233     deallocate((unsigned char*)owned_monitors_list->at(i));
1234   }
1235   delete owned_monitors_list;
1236 
1237   return err;
1238 } /* end GetOwnedMonitorInfo */
1239 
1240 
1241 // Threads_lock NOT held, java_thread not protected by lock
1242 // java_thread - pre-checked
1243 // monitor_info_count_ptr - pre-checked for NULL
1244 // monitor_info_ptr - pre-checked for NULL
1245 jvmtiError
1246 JvmtiEnv::GetOwnedMonitorStackDepthInfo(JavaThread* java_thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
1247   jvmtiError err = JVMTI_ERROR_NONE;
1248   JavaThread* calling_thread = JavaThread::current();
1249 
1250   // growable array of jvmti monitors info on the C-heap
1251   GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1252          new (ResourceObj::C_HEAP, mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1253 
1254   // It is only safe to perform the direct operation on the current
1255   // thread. All other usage needs to use a direct handshake for safety.
1256   if (java_thread == calling_thread) {
1257     err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1258   } else {
1259     // get owned monitors info with handshake
1260     GetOwnedMonitorInfoClosure op(calling_thread, this, owned_monitors_list);
1261     bool executed = Handshake::execute_direct(&op, java_thread);
1262     err = executed ? op.result() : JVMTI_ERROR_THREAD_NOT_ALIVE;
1263   }
1264 
1265   jint owned_monitor_count = owned_monitors_list->length();
1266   if (err == JVMTI_ERROR_NONE) {
1267     if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo),
1268                       (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) {
1269       // copy to output array.
1270       for (int i = 0; i < owned_monitor_count; i++) {
1271         (*monitor_info_ptr)[i].monitor =
1272           ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1273         (*monitor_info_ptr)[i].stack_depth =
1274           ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth;
1275       }
1276     }
1277     *monitor_info_count_ptr = owned_monitor_count;
1278   }
1279 
1280   // clean up.
1281   for (int i = 0; i < owned_monitor_count; i++) {
1282     deallocate((unsigned char*)owned_monitors_list->at(i));
1283   }
1284   delete owned_monitors_list;
1285 
1286   return err;
1287 } /* end GetOwnedMonitorStackDepthInfo */
1288 
1289 
1290 // Threads_lock NOT held, java_thread not protected by lock
1291 // java_thread - pre-checked
1292 // monitor_ptr - pre-checked for NULL
1293 jvmtiError
1294 JvmtiEnv::GetCurrentContendedMonitor(JavaThread* java_thread, jobject* monitor_ptr) {
1295   jvmtiError err = JVMTI_ERROR_NONE;
1296   JavaThread* calling_thread = JavaThread::current();
1297 
1298   // It is only safe to perform the direct operation on the current
1299   // thread. All other usage needs to use a direct handshake for safety.
1300   if (java_thread == calling_thread) {
1301     err = get_current_contended_monitor(calling_thread, java_thread, monitor_ptr);
1302   } else {
1303     // get contended monitor information with handshake
1304     GetCurrentContendedMonitorClosure op(calling_thread, this, monitor_ptr);
1305     bool executed = Handshake::execute_direct(&op, java_thread);
1306     err = executed ? op.result() : JVMTI_ERROR_THREAD_NOT_ALIVE;
1307   }
1308   return err;
1309 } /* end GetCurrentContendedMonitor */
1310 
1311 
1312 // Threads_lock NOT held
1313 // thread - NOT pre-checked
1314 // proc - pre-checked for NULL
1315 // arg - NULL is a valid value, must be checked
1316 jvmtiError
1317 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) {
1318   JavaThread* current_thread = JavaThread::current();
1319 
1320   JavaThread* java_thread = NULL;
1321   oop thread_oop = NULL;
1322   ThreadsListHandle tlh(current_thread);
1323   jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1324   if (err != JVMTI_ERROR_NONE) {
1325     // We got an error code so we don't have a JavaThread *, but
1326     // only return an error from here if we didn't get a valid
1327     // thread_oop.
1328     if (thread_oop == NULL) {
1329       return err;
1330     }
1331     // We have a valid thread_oop.
1332   }
1333 
1334   if (java_thread != NULL) {
1335     // 'thread' refers to an existing JavaThread.
1336     return JVMTI_ERROR_INVALID_THREAD;
1337   }
1338 
1339   if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) {
1340     return JVMTI_ERROR_INVALID_PRIORITY;
1341   }
1342 
1343   Handle thread_hndl(current_thread, thread_oop);
1344   {
1345     MutexLocker mu(current_thread, Threads_lock); // grab Threads_lock
1346 
1347     JvmtiAgentThread *new_thread = new JvmtiAgentThread(this, proc, arg);
1348 
1349     // At this point it may be possible that no osthread was created for the
1350     // JavaThread due to lack of memory.
1351     if (new_thread == NULL || new_thread->osthread() == NULL) {
1352       if (new_thread != NULL) {
1353         new_thread->smr_delete();
1354       }
1355       return JVMTI_ERROR_OUT_OF_MEMORY;
1356     }
1357 
1358     java_lang_Thread::set_thread(thread_hndl(), new_thread);
1359     java_lang_Thread::set_priority(thread_hndl(), (ThreadPriority)priority);
1360     java_lang_Thread::set_daemon(thread_hndl());
1361 
1362     new_thread->set_threadObj(thread_hndl());
1363     Threads::add(new_thread);
1364     Thread::start(new_thread);
1365   } // unlock Threads_lock
1366 
1367   return JVMTI_ERROR_NONE;
1368 } /* end RunAgentThread */
1369 
1370   //
1371   // Thread Group functions
1372   //
1373 
1374 // group_count_ptr - pre-checked for NULL
1375 // groups_ptr - pre-checked for NULL
1376 jvmtiError
1377 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) {
1378   JavaThread* current_thread = JavaThread::current();
1379 
1380   // Only one top level thread group now.
1381   *group_count_ptr = 1;
1382 
1383   // Allocate memory to store global-refs to the thread groups.
1384   // Assume this area is freed by caller.
1385   *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
1386 
1387   NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY);
1388 
1389   // Convert oop to Handle, then convert Handle to global-ref.
1390   {
1391     HandleMark hm(current_thread);
1392     Handle system_thread_group(current_thread, Universe::system_thread_group());
1393     *groups_ptr[0] = jni_reference(system_thread_group);
1394   }
1395 
1396   return JVMTI_ERROR_NONE;
1397 } /* end GetTopThreadGroups */
1398 
1399 
1400 // info_ptr - pre-checked for NULL
1401 jvmtiError
1402 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) {
1403   ResourceMark rm;
1404   HandleMark hm;
1405 
1406   JavaThread* current_thread = JavaThread::current();
1407 
1408   Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group));
1409   NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP);
1410 
1411   const char* name;
1412   Handle parent_group;
1413   bool is_daemon;
1414   ThreadPriority max_priority;
1415 
1416   name         = java_lang_ThreadGroup::name(group_obj());
1417   parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj()));
1418   is_daemon    = java_lang_ThreadGroup::is_daemon(group_obj());
1419   max_priority = java_lang_ThreadGroup::maxPriority(group_obj());
1420 
1421   info_ptr->is_daemon    = is_daemon;
1422   info_ptr->max_priority = max_priority;
1423   info_ptr->parent       = jni_reference(parent_group);
1424 
1425   if (name != NULL) {
1426     info_ptr->name = (char*)jvmtiMalloc(strlen(name)+1);
1427     NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY);
1428     strcpy(info_ptr->name, name);
1429   } else {
1430     info_ptr->name = NULL;
1431   }
1432 
1433   return JVMTI_ERROR_NONE;
1434 } /* end GetThreadGroupInfo */
1435 
1436 
1437 // thread_count_ptr - pre-checked for NULL
1438 // threads_ptr - pre-checked for NULL
1439 // group_count_ptr - pre-checked for NULL
1440 // groups_ptr - pre-checked for NULL
1441 jvmtiError
1442 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) {
1443   JavaThread* current_thread = JavaThread::current();
1444   oop group_obj = (oop) JNIHandles::resolve_external_guard(group);
1445   NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP);
1446 
1447   Handle *thread_objs = NULL;
1448   Handle *group_objs  = NULL;
1449   int nthreads = 0;
1450   int ngroups = 0;
1451   int hidden_threads = 0;
1452 
1453   ResourceMark rm(current_thread);
1454   HandleMark hm(current_thread);
1455 
1456   Handle group_hdl(current_thread, group_obj);
1457 
1458   { // Cannot allow thread or group counts to change.
1459     ObjectLocker ol(group_hdl, current_thread);
1460 
1461     nthreads = java_lang_ThreadGroup::nthreads(group_hdl());
1462     ngroups  = java_lang_ThreadGroup::ngroups(group_hdl());
1463 
1464     if (nthreads > 0) {
1465       ThreadsListHandle tlh(current_thread);
1466       objArrayOop threads = java_lang_ThreadGroup::threads(group_hdl());
1467       assert(nthreads <= threads->length(), "too many threads");
1468       thread_objs = NEW_RESOURCE_ARRAY(Handle,nthreads);
1469       for (int i = 0, j = 0; i < nthreads; i++) {
1470         oop thread_obj = threads->obj_at(i);
1471         assert(thread_obj != NULL, "thread_obj is NULL");
1472         JavaThread *java_thread = NULL;
1473         jvmtiError err = JvmtiExport::cv_oop_to_JavaThread(tlh.list(), thread_obj, &java_thread);
1474         if (err == JVMTI_ERROR_NONE) {
1475           // Have a valid JavaThread*.
1476           if (java_thread->is_hidden_from_external_view()) {
1477             // Filter out hidden java threads.
1478             hidden_threads++;
1479             continue;
1480           }
1481         } else {
1482           // We couldn't convert thread_obj into a JavaThread*.
1483           if (err == JVMTI_ERROR_INVALID_THREAD) {
1484             // The thread_obj does not refer to a java.lang.Thread object
1485             // so skip it.
1486             hidden_threads++;
1487             continue;
1488           }
1489           // We have a valid thread_obj, but no JavaThread*; the caller
1490           // can still have limited use for the thread_obj.
1491         }
1492         thread_objs[j++] = Handle(current_thread, thread_obj);
1493       }
1494       nthreads -= hidden_threads;
1495     } // ThreadsListHandle is destroyed here.
1496 
1497     if (ngroups > 0) {
1498       objArrayOop groups = java_lang_ThreadGroup::groups(group_hdl());
1499       assert(ngroups <= groups->length(), "too many groups");
1500       group_objs = NEW_RESOURCE_ARRAY(Handle,ngroups);
1501       for (int i = 0; i < ngroups; i++) {
1502         oop group_obj = groups->obj_at(i);
1503         assert(group_obj != NULL, "group_obj != NULL");
1504         group_objs[i] = Handle(current_thread, group_obj);
1505       }
1506     }
1507   } // ThreadGroup unlocked here
1508 
1509   *group_count_ptr  = ngroups;
1510   *thread_count_ptr = nthreads;
1511   *threads_ptr     = new_jthreadArray(nthreads, thread_objs);
1512   *groups_ptr      = new_jthreadGroupArray(ngroups, group_objs);
1513   if ((nthreads > 0) && (*threads_ptr == NULL)) {
1514     return JVMTI_ERROR_OUT_OF_MEMORY;
1515   }
1516   if ((ngroups > 0) && (*groups_ptr == NULL)) {
1517     return JVMTI_ERROR_OUT_OF_MEMORY;
1518   }
1519 
1520   return JVMTI_ERROR_NONE;
1521 } /* end GetThreadGroupChildren */
1522 
1523 
1524   //
1525   // Stack Frame functions
1526   //
1527 
1528 // Threads_lock NOT held, java_thread not protected by lock
1529 // java_thread - pre-checked
1530 // max_frame_count - pre-checked to be greater than or equal to 0
1531 // frame_buffer - pre-checked for NULL
1532 // count_ptr - pre-checked for NULL
1533 jvmtiError
1534 JvmtiEnv::GetStackTrace(JavaThread* java_thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
1535   jvmtiError err = JVMTI_ERROR_NONE;
1536 
1537   // It is only safe to perform the direct operation on the current
1538   // thread. All other usage needs to use a vm-safepoint-op for safety.
1539   if (java_thread == JavaThread::current()) {
1540     err = get_stack_trace(java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
1541   } else {
1542     // JVMTI get stack trace at safepoint. Do not require target thread to
1543     // be suspended.
1544     VM_GetStackTrace op(this, java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
1545     VMThread::execute(&op);
1546     err = op.result();
1547   }
1548 
1549   return err;
1550 } /* end GetStackTrace */
1551 
1552 
1553 // max_frame_count - pre-checked to be greater than or equal to 0
1554 // stack_info_ptr - pre-checked for NULL
1555 // thread_count_ptr - pre-checked for NULL
1556 jvmtiError
1557 JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) {
1558   jvmtiError err = JVMTI_ERROR_NONE;
1559   JavaThread* calling_thread = JavaThread::current();
1560 
1561   // JVMTI get stack traces at safepoint.
1562   VM_GetAllStackTraces op(this, calling_thread, max_frame_count);
1563   VMThread::execute(&op);
1564   *thread_count_ptr = op.final_thread_count();
1565   *stack_info_ptr = op.stack_info();
1566   err = op.result();
1567   return err;
1568 } /* end GetAllStackTraces */
1569 
1570 
1571 // thread_count - pre-checked to be greater than or equal to 0
1572 // thread_list - pre-checked for NULL
1573 // max_frame_count - pre-checked to be greater than or equal to 0
1574 // stack_info_ptr - pre-checked for NULL
1575 jvmtiError
1576 JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) {
1577   jvmtiError err = JVMTI_ERROR_NONE;
1578   // JVMTI get stack traces at safepoint.
1579   VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count);
1580   VMThread::execute(&op);
1581   err = op.result();
1582   if (err == JVMTI_ERROR_NONE) {
1583     *stack_info_ptr = op.stack_info();
1584   }
1585   return err;
1586 } /* end GetThreadListStackTraces */
1587 
1588 
1589 // Threads_lock NOT held, java_thread not protected by lock
1590 // java_thread - pre-checked
1591 // count_ptr - pre-checked for NULL
1592 jvmtiError
1593 JvmtiEnv::GetFrameCount(JavaThread* java_thread, jint* count_ptr) {
1594   jvmtiError err = JVMTI_ERROR_NONE;
1595 
1596   // retrieve or create JvmtiThreadState.
1597   JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1598   if (state == NULL) {
1599     return JVMTI_ERROR_THREAD_NOT_ALIVE;
1600   }
1601 
1602   // It is only safe to perform the direct operation on the current
1603   // thread. All other usage needs to use a vm-safepoint-op for safety.
1604   if (java_thread == JavaThread::current()) {
1605     err = get_frame_count(state, count_ptr);
1606   } else {
1607     // get java stack frame count at safepoint.
1608     VM_GetFrameCount op(this, state, count_ptr);
1609     VMThread::execute(&op);
1610     err = op.result();
1611   }
1612   return err;
1613 } /* end GetFrameCount */
1614 
1615 
1616 // Threads_lock NOT held, java_thread not protected by lock
1617 // java_thread - pre-checked
1618 jvmtiError
1619 JvmtiEnv::PopFrame(JavaThread* java_thread) {
1620   JavaThread* current_thread  = JavaThread::current();
1621   HandleMark hm(current_thread);
1622   uint32_t debug_bits = 0;
1623 
1624   // retrieve or create the state
1625   JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1626   if (state == NULL) {
1627     return JVMTI_ERROR_THREAD_NOT_ALIVE;
1628   }
1629 
1630   // Check if java_thread is fully suspended
1631   if (!java_thread->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) {
1632     return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1633   }
1634   // Check to see if a PopFrame was already in progress
1635   if (java_thread->popframe_condition() != JavaThread::popframe_inactive) {
1636     // Probably possible for JVMTI clients to trigger this, but the
1637     // JPDA backend shouldn't allow this to happen
1638     return JVMTI_ERROR_INTERNAL;
1639   }
1640 
1641   {
1642     // Was workaround bug
1643     //    4812902: popFrame hangs if the method is waiting at a synchronize
1644     // Catch this condition and return an error to avoid hanging.
1645     // Now JVMTI spec allows an implementation to bail out with an opaque frame error.
1646     OSThread* osThread = java_thread->osthread();
1647     if (osThread->get_state() == MONITOR_WAIT) {
1648       return JVMTI_ERROR_OPAQUE_FRAME;
1649     }
1650   }
1651 
1652   {
1653     ResourceMark rm(current_thread);
1654     // Check if there are more than one Java frame in this thread, that the top two frames
1655     // are Java (not native) frames, and that there is no intervening VM frame
1656     int frame_count = 0;
1657     bool is_interpreted[2];
1658     intptr_t *frame_sp[2];
1659     // The 2-nd arg of constructor is needed to stop iterating at java entry frame.
1660     for (vframeStream vfs(java_thread, true); !vfs.at_end(); vfs.next()) {
1661       methodHandle mh(current_thread, vfs.method());
1662       if (mh->is_native()) return(JVMTI_ERROR_OPAQUE_FRAME);
1663       is_interpreted[frame_count] = vfs.is_interpreted_frame();
1664       frame_sp[frame_count] = vfs.frame_id();
1665       if (++frame_count > 1) break;
1666     }
1667     if (frame_count < 2)  {
1668       // We haven't found two adjacent non-native Java frames on the top.
1669       // There can be two situations here:
1670       //  1. There are no more java frames
1671       //  2. Two top java frames are separated by non-java native frames
1672       if(vframeFor(java_thread, 1) == NULL) {
1673         return JVMTI_ERROR_NO_MORE_FRAMES;
1674       } else {
1675         // Intervening non-java native or VM frames separate java frames.
1676         // Current implementation does not support this. See bug #5031735.
1677         // In theory it is possible to pop frames in such cases.
1678         return JVMTI_ERROR_OPAQUE_FRAME;
1679       }
1680     }
1681 
1682     // If any of the top 2 frames is a compiled one, need to deoptimize it
1683     for (int i = 0; i < 2; i++) {
1684       if (!is_interpreted[i]) {
1685         Deoptimization::deoptimize_frame(java_thread, frame_sp[i]);
1686       }
1687     }
1688 
1689     // Update the thread state to reflect that the top frame is popped
1690     // so that cur_stack_depth is maintained properly and all frameIDs
1691     // are invalidated.
1692     // The current frame will be popped later when the suspended thread
1693     // is resumed and right before returning from VM to Java.
1694     // (see call_VM_base() in assembler_<cpu>.cpp).
1695 
1696     // It's fine to update the thread state here because no JVMTI events
1697     // shall be posted for this PopFrame.
1698 
1699     // It is only safe to perform the direct operation on the current
1700     // thread. All other usage needs to use a vm-safepoint-op for safety.
1701     if (java_thread == JavaThread::current()) {
1702       state->update_for_pop_top_frame();
1703     } else {
1704       VM_UpdateForPopTopFrame op(state);
1705       VMThread::execute(&op);
1706       jvmtiError err = op.result();
1707       if (err != JVMTI_ERROR_NONE) {
1708         return err;
1709       }
1710     }
1711 
1712     java_thread->set_popframe_condition(JavaThread::popframe_pending_bit);
1713     // Set pending step flag for this popframe and it is cleared when next
1714     // step event is posted.
1715     state->set_pending_step_for_popframe();
1716   }
1717 
1718   return JVMTI_ERROR_NONE;
1719 } /* end PopFrame */
1720 
1721 
1722 // Threads_lock NOT held, java_thread not protected by lock
1723 // java_thread - pre-checked
1724 // java_thread - unchecked
1725 // depth - pre-checked as non-negative
1726 // method_ptr - pre-checked for NULL
1727 // location_ptr - pre-checked for NULL
1728 jvmtiError
1729 JvmtiEnv::GetFrameLocation(JavaThread* java_thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) {
1730   jvmtiError err = JVMTI_ERROR_NONE;
1731 
1732   // It is only safe to perform the direct operation on the current
1733   // thread. All other usage needs to use a vm-safepoint-op for safety.
1734   if (java_thread == JavaThread::current()) {
1735     err = get_frame_location(java_thread, depth, method_ptr, location_ptr);
1736   } else {
1737     // JVMTI get java stack frame location at safepoint.
1738     VM_GetFrameLocation op(this, java_thread, depth, method_ptr, location_ptr);
1739     VMThread::execute(&op);
1740     err = op.result();
1741   }
1742   return err;
1743 } /* end GetFrameLocation */
1744 
1745 
1746 // Threads_lock NOT held, java_thread not protected by lock
1747 // java_thread - pre-checked
1748 // java_thread - unchecked
1749 // depth - pre-checked as non-negative
1750 jvmtiError
1751 JvmtiEnv::NotifyFramePop(JavaThread* java_thread, jint depth) {
1752   jvmtiError err = JVMTI_ERROR_NONE;
1753   ResourceMark rm;
1754   uint32_t debug_bits = 0;
1755 
1756   JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread);
1757   if (state == NULL) {
1758     return JVMTI_ERROR_THREAD_NOT_ALIVE;
1759   }
1760 
1761   if (!java_thread->is_thread_fully_suspended(true, &debug_bits)) {
1762     return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1763   }
1764 
1765   if (TraceJVMTICalls) {
1766     JvmtiSuspendControl::print();
1767   }
1768 
1769   vframe *vf = vframeFor(java_thread, depth);
1770   if (vf == NULL) {
1771     return JVMTI_ERROR_NO_MORE_FRAMES;
1772   }
1773 
1774   if (!vf->is_java_frame() || ((javaVFrame*) vf)->method()->is_native()) {
1775     return JVMTI_ERROR_OPAQUE_FRAME;
1776   }
1777 
1778   assert(vf->frame_pointer() != NULL, "frame pointer mustn't be NULL");
1779 
1780   // It is only safe to perform the direct operation on the current
1781   // thread. All other usage needs to use a vm-safepoint-op for safety.
1782   if (java_thread == JavaThread::current()) {
1783     int frame_number = state->count_frames() - depth;
1784     state->env_thread_state(this)->set_frame_pop(frame_number);
1785   } else {
1786     VM_SetFramePop op(this, state, depth);
1787     VMThread::execute(&op);
1788     err = op.result();
1789   }
1790   return err;
1791 } /* end NotifyFramePop */
1792 
1793 
1794   //
1795   // Force Early Return functions
1796   //
1797 
1798 // Threads_lock NOT held, java_thread not protected by lock
1799 // java_thread - pre-checked
1800 jvmtiError
1801 JvmtiEnv::ForceEarlyReturnObject(JavaThread* java_thread, jobject value) {
1802   jvalue val;
1803   val.l = value;
1804   return force_early_return(java_thread, val, atos);
1805 } /* end ForceEarlyReturnObject */
1806 
1807 
1808 // Threads_lock NOT held, java_thread not protected by lock
1809 // java_thread - pre-checked
1810 jvmtiError
1811 JvmtiEnv::ForceEarlyReturnInt(JavaThread* java_thread, jint value) {
1812   jvalue val;
1813   val.i = value;
1814   return force_early_return(java_thread, val, itos);
1815 } /* end ForceEarlyReturnInt */
1816 
1817 
1818 // Threads_lock NOT held, java_thread not protected by lock
1819 // java_thread - pre-checked
1820 jvmtiError
1821 JvmtiEnv::ForceEarlyReturnLong(JavaThread* java_thread, jlong value) {
1822   jvalue val;
1823   val.j = value;
1824   return force_early_return(java_thread, val, ltos);
1825 } /* end ForceEarlyReturnLong */
1826 
1827 
1828 // Threads_lock NOT held, java_thread not protected by lock
1829 // java_thread - pre-checked
1830 jvmtiError
1831 JvmtiEnv::ForceEarlyReturnFloat(JavaThread* java_thread, jfloat value) {
1832   jvalue val;
1833   val.f = value;
1834   return force_early_return(java_thread, val, ftos);
1835 } /* end ForceEarlyReturnFloat */
1836 
1837 
1838 // Threads_lock NOT held, java_thread not protected by lock
1839 // java_thread - pre-checked
1840 jvmtiError
1841 JvmtiEnv::ForceEarlyReturnDouble(JavaThread* java_thread, jdouble value) {
1842   jvalue val;
1843   val.d = value;
1844   return force_early_return(java_thread, val, dtos);
1845 } /* end ForceEarlyReturnDouble */
1846 
1847 
1848 // Threads_lock NOT held, java_thread not protected by lock
1849 // java_thread - pre-checked
1850 jvmtiError
1851 JvmtiEnv::ForceEarlyReturnVoid(JavaThread* java_thread) {
1852   jvalue val;
1853   val.j = 0L;
1854   return force_early_return(java_thread, val, vtos);
1855 } /* end ForceEarlyReturnVoid */
1856 
1857 
1858   //
1859   // Heap functions
1860   //
1861 
1862 // klass - NULL is a valid value, must be checked
1863 // initial_object - NULL is a valid value, must be checked
1864 // callbacks - pre-checked for NULL
1865 // user_data - NULL is a valid value, must be checked
1866 jvmtiError
1867 JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1868   // check klass if provided
1869   Klass* k = NULL;
1870   if (klass != NULL) {
1871     oop k_mirror = JNIHandles::resolve_external_guard(klass);
1872     if (k_mirror == NULL) {
1873       return JVMTI_ERROR_INVALID_CLASS;
1874     }
1875     if (java_lang_Class::is_primitive(k_mirror)) {
1876       return JVMTI_ERROR_NONE;
1877     }
1878     k = java_lang_Class::as_Klass(k_mirror);
1879     if (klass == NULL) {
1880       return JVMTI_ERROR_INVALID_CLASS;
1881     }
1882   }
1883 
1884   if (initial_object != NULL) {
1885     oop init_obj = JNIHandles::resolve_external_guard(initial_object);
1886     if (init_obj == NULL) {
1887       return JVMTI_ERROR_INVALID_OBJECT;
1888     }
1889   }
1890 
1891   Thread *thread = Thread::current();
1892   HandleMark hm(thread);
1893 
1894   TraceTime t("FollowReferences", TRACETIME_LOG(Debug, jvmti, objecttagging));
1895   JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, k, initial_object, callbacks, user_data);
1896   return JVMTI_ERROR_NONE;
1897 } /* end FollowReferences */
1898 
1899 
1900 // klass - NULL is a valid value, must be checked
1901 // callbacks - pre-checked for NULL
1902 // user_data - NULL is a valid value, must be checked
1903 jvmtiError
1904 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1905   // check klass if provided
1906   Klass* k = NULL;
1907   if (klass != NULL) {
1908     oop k_mirror = JNIHandles::resolve_external_guard(klass);
1909     if (k_mirror == NULL) {
1910       return JVMTI_ERROR_INVALID_CLASS;
1911     }
1912     if (java_lang_Class::is_primitive(k_mirror)) {
1913       return JVMTI_ERROR_NONE;
1914     }
1915     k = java_lang_Class::as_Klass(k_mirror);
1916     if (k == NULL) {
1917       return JVMTI_ERROR_INVALID_CLASS;
1918     }
1919   }
1920 
1921   TraceTime t("IterateThroughHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
1922   JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, k, callbacks, user_data);
1923   return JVMTI_ERROR_NONE;
1924 } /* end IterateThroughHeap */
1925 
1926 
1927 // tag_ptr - pre-checked for NULL
1928 jvmtiError
1929 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) {
1930   oop o = JNIHandles::resolve_external_guard(object);
1931   NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1932   *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object);
1933   return JVMTI_ERROR_NONE;
1934 } /* end GetTag */
1935 
1936 
1937 jvmtiError
1938 JvmtiEnv::SetTag(jobject object, jlong tag) {
1939   oop o = JNIHandles::resolve_external_guard(object);
1940   NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1941   JvmtiTagMap::tag_map_for(this)->set_tag(object, tag);
1942   return JVMTI_ERROR_NONE;
1943 } /* end SetTag */
1944 
1945 
1946 // tag_count - pre-checked to be greater than or equal to 0
1947 // tags - pre-checked for NULL
1948 // count_ptr - pre-checked for NULL
1949 // object_result_ptr - NULL is a valid value, must be checked
1950 // tag_result_ptr - NULL is a valid value, must be checked
1951 jvmtiError
1952 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
1953   TraceTime t("GetObjectsWithTags", TRACETIME_LOG(Debug, jvmti, objecttagging));
1954   return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
1955 } /* end GetObjectsWithTags */
1956 
1957 
1958 jvmtiError
1959 JvmtiEnv::ForceGarbageCollection() {
1960   Universe::heap()->collect(GCCause::_jvmti_force_gc);
1961   return JVMTI_ERROR_NONE;
1962 } /* end ForceGarbageCollection */
1963 
1964 
1965   //
1966   // Heap (1.0) functions
1967   //
1968 
1969 // object_reference_callback - pre-checked for NULL
1970 // user_data - NULL is a valid value, must be checked
1971 jvmtiError
1972 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) {
1973   oop o = JNIHandles::resolve_external_guard(object);
1974   NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1975   JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data);
1976   return JVMTI_ERROR_NONE;
1977 } /* end IterateOverObjectsReachableFromObject */
1978 
1979 
1980 // heap_root_callback - NULL is a valid value, must be checked
1981 // stack_ref_callback - NULL is a valid value, must be checked
1982 // object_ref_callback - NULL is a valid value, must be checked
1983 // user_data - NULL is a valid value, must be checked
1984 jvmtiError
1985 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) {
1986   TraceTime t("IterateOverReachableObjects", TRACETIME_LOG(Debug, jvmti, objecttagging));
1987   JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data);
1988   return JVMTI_ERROR_NONE;
1989 } /* end IterateOverReachableObjects */
1990 
1991 
1992 // heap_object_callback - pre-checked for NULL
1993 // user_data - NULL is a valid value, must be checked
1994 jvmtiError
1995 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
1996   TraceTime t("IterateOverHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
1997   Thread *thread = Thread::current();
1998   HandleMark hm(thread);
1999   JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, NULL, heap_object_callback, user_data);
2000   return JVMTI_ERROR_NONE;
2001 } /* end IterateOverHeap */
2002 
2003 
2004 // k_mirror - may be primitive, this must be checked
2005 // heap_object_callback - pre-checked for NULL
2006 // user_data - NULL is a valid value, must be checked
2007 jvmtiError
2008 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2009   if (java_lang_Class::is_primitive(k_mirror)) {
2010     // DO PRIMITIVE CLASS PROCESSING
2011     return JVMTI_ERROR_NONE;
2012   }
2013   Klass* klass = java_lang_Class::as_Klass(k_mirror);
2014   if (klass == NULL) {
2015     return JVMTI_ERROR_INVALID_CLASS;
2016   }
2017   TraceTime t("IterateOverInstancesOfClass", TRACETIME_LOG(Debug, jvmti, objecttagging));
2018   JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data);
2019   return JVMTI_ERROR_NONE;
2020 } /* end IterateOverInstancesOfClass */
2021 
2022 
2023   //
2024   // Local Variable functions
2025   //
2026 
2027 // Threads_lock NOT held, java_thread not protected by lock
2028 // java_thread - pre-checked
2029 // java_thread - unchecked
2030 // depth - pre-checked as non-negative
2031 // value_ptr - pre-checked for NULL
2032 jvmtiError
2033 JvmtiEnv::GetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject* value_ptr) {
2034   JavaThread* current_thread = JavaThread::current();
2035   // rm object is created to clean up the javaVFrame created in
2036   // doit_prologue(), but after doit() is finished with it.
2037   ResourceMark rm(current_thread);
2038 
2039   VM_GetOrSetLocal op(java_thread, current_thread, depth, slot);
2040   VMThread::execute(&op);
2041   jvmtiError err = op.result();
2042   if (err != JVMTI_ERROR_NONE) {
2043     return err;
2044   } else {
2045     *value_ptr = op.value().l;
2046     return JVMTI_ERROR_NONE;
2047   }
2048 } /* end GetLocalObject */
2049 
2050 // Threads_lock NOT held, java_thread not protected by lock
2051 // java_thread - pre-checked
2052 // java_thread - unchecked
2053 // depth - pre-checked as non-negative
2054 // value - pre-checked for NULL
2055 jvmtiError
2056 JvmtiEnv::GetLocalInstance(JavaThread* java_thread, jint depth, jobject* value_ptr){
2057   JavaThread* current_thread = JavaThread::current();
2058   // rm object is created to clean up the javaVFrame created in
2059   // doit_prologue(), but after doit() is finished with it.
2060   ResourceMark rm(current_thread);
2061 
2062   VM_GetReceiver op(java_thread, current_thread, depth);
2063   VMThread::execute(&op);
2064   jvmtiError err = op.result();
2065   if (err != JVMTI_ERROR_NONE) {
2066     return err;
2067   } else {
2068     *value_ptr = op.value().l;
2069     return JVMTI_ERROR_NONE;
2070   }
2071 } /* end GetLocalInstance */
2072 
2073 
2074 // Threads_lock NOT held, java_thread not protected by lock
2075 // java_thread - pre-checked
2076 // java_thread - unchecked
2077 // depth - pre-checked as non-negative
2078 // value_ptr - pre-checked for NULL
2079 jvmtiError
2080 JvmtiEnv::GetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint* value_ptr) {
2081   // rm object is created to clean up the javaVFrame created in
2082   // doit_prologue(), but after doit() is finished with it.
2083   ResourceMark rm;
2084 
2085   VM_GetOrSetLocal op(java_thread, depth, slot, T_INT);
2086   VMThread::execute(&op);
2087   *value_ptr = op.value().i;
2088   return op.result();
2089 } /* end GetLocalInt */
2090 
2091 
2092 // Threads_lock NOT held, java_thread not protected by lock
2093 // java_thread - pre-checked
2094 // java_thread - unchecked
2095 // depth - pre-checked as non-negative
2096 // value_ptr - pre-checked for NULL
2097 jvmtiError
2098 JvmtiEnv::GetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong* value_ptr) {
2099   // rm object is created to clean up the javaVFrame created in
2100   // doit_prologue(), but after doit() is finished with it.
2101   ResourceMark rm;
2102 
2103   VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG);
2104   VMThread::execute(&op);
2105   *value_ptr = op.value().j;
2106   return op.result();
2107 } /* end GetLocalLong */
2108 
2109 
2110 // Threads_lock NOT held, java_thread not protected by lock
2111 // java_thread - pre-checked
2112 // java_thread - unchecked
2113 // depth - pre-checked as non-negative
2114 // value_ptr - pre-checked for NULL
2115 jvmtiError
2116 JvmtiEnv::GetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat* value_ptr) {
2117   // rm object is created to clean up the javaVFrame created in
2118   // doit_prologue(), but after doit() is finished with it.
2119   ResourceMark rm;
2120 
2121   VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT);
2122   VMThread::execute(&op);
2123   *value_ptr = op.value().f;
2124   return op.result();
2125 } /* end GetLocalFloat */
2126 
2127 
2128 // Threads_lock NOT held, java_thread not protected by lock
2129 // java_thread - pre-checked
2130 // java_thread - unchecked
2131 // depth - pre-checked as non-negative
2132 // value_ptr - pre-checked for NULL
2133 jvmtiError
2134 JvmtiEnv::GetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble* value_ptr) {
2135   // rm object is created to clean up the javaVFrame created in
2136   // doit_prologue(), but after doit() is finished with it.
2137   ResourceMark rm;
2138 
2139   VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE);
2140   VMThread::execute(&op);
2141   *value_ptr = op.value().d;
2142   return op.result();
2143 } /* end GetLocalDouble */
2144 
2145 
2146 // Threads_lock NOT held, java_thread not protected by lock
2147 // java_thread - pre-checked
2148 // java_thread - unchecked
2149 // depth - pre-checked as non-negative
2150 jvmtiError
2151 JvmtiEnv::SetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject value) {
2152   // rm object is created to clean up the javaVFrame created in
2153   // doit_prologue(), but after doit() is finished with it.
2154   ResourceMark rm;
2155   jvalue val;
2156   val.l = value;
2157   VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val);
2158   VMThread::execute(&op);
2159   return op.result();
2160 } /* end SetLocalObject */
2161 
2162 
2163 // Threads_lock NOT held, java_thread not protected by lock
2164 // java_thread - pre-checked
2165 // java_thread - unchecked
2166 // depth - pre-checked as non-negative
2167 jvmtiError
2168 JvmtiEnv::SetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint value) {
2169   // rm object is created to clean up the javaVFrame created in
2170   // doit_prologue(), but after doit() is finished with it.
2171   ResourceMark rm;
2172   jvalue val;
2173   val.i = value;
2174   VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val);
2175   VMThread::execute(&op);
2176   return op.result();
2177 } /* end SetLocalInt */
2178 
2179 
2180 // Threads_lock NOT held, java_thread not protected by lock
2181 // java_thread - pre-checked
2182 // java_thread - unchecked
2183 // depth - pre-checked as non-negative
2184 jvmtiError
2185 JvmtiEnv::SetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong value) {
2186   // rm object is created to clean up the javaVFrame created in
2187   // doit_prologue(), but after doit() is finished with it.
2188   ResourceMark rm;
2189   jvalue val;
2190   val.j = value;
2191   VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val);
2192   VMThread::execute(&op);
2193   return op.result();
2194 } /* end SetLocalLong */
2195 
2196 
2197 // Threads_lock NOT held, java_thread not protected by lock
2198 // java_thread - pre-checked
2199 // java_thread - unchecked
2200 // depth - pre-checked as non-negative
2201 jvmtiError
2202 JvmtiEnv::SetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat value) {
2203   // rm object is created to clean up the javaVFrame created in
2204   // doit_prologue(), but after doit() is finished with it.
2205   ResourceMark rm;
2206   jvalue val;
2207   val.f = value;
2208   VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val);
2209   VMThread::execute(&op);
2210   return op.result();
2211 } /* end SetLocalFloat */
2212 
2213 
2214 // Threads_lock NOT held, java_thread not protected by lock
2215 // java_thread - pre-checked
2216 // java_thread - unchecked
2217 // depth - pre-checked as non-negative
2218 jvmtiError
2219 JvmtiEnv::SetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble value) {
2220   // rm object is created to clean up the javaVFrame created in
2221   // doit_prologue(), but after doit() is finished with it.
2222   ResourceMark rm;
2223   jvalue val;
2224   val.d = value;
2225   VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val);
2226   VMThread::execute(&op);
2227   return op.result();
2228 } /* end SetLocalDouble */
2229 
2230 
2231   //
2232   // Breakpoint functions
2233   //
2234 
2235 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2236 jvmtiError
2237 JvmtiEnv::SetBreakpoint(Method* method_oop, jlocation location) {
2238   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2239   if (location < 0) {   // simple invalid location check first
2240     return JVMTI_ERROR_INVALID_LOCATION;
2241   }
2242   // verify that the breakpoint is not past the end of the method
2243   if (location >= (jlocation) method_oop->code_size()) {
2244     return JVMTI_ERROR_INVALID_LOCATION;
2245   }
2246 
2247   ResourceMark rm;
2248   JvmtiBreakpoint bp(method_oop, location);
2249   JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2250   if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE)
2251     return JVMTI_ERROR_DUPLICATE;
2252 
2253   if (TraceJVMTICalls) {
2254     jvmti_breakpoints.print();
2255   }
2256 
2257   return JVMTI_ERROR_NONE;
2258 } /* end SetBreakpoint */
2259 
2260 
2261 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2262 jvmtiError
2263 JvmtiEnv::ClearBreakpoint(Method* method_oop, jlocation location) {
2264   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2265 
2266   if (location < 0) {   // simple invalid location check first
2267     return JVMTI_ERROR_INVALID_LOCATION;
2268   }
2269 
2270   // verify that the breakpoint is not past the end of the method
2271   if (location >= (jlocation) method_oop->code_size()) {
2272     return JVMTI_ERROR_INVALID_LOCATION;
2273   }
2274 
2275   JvmtiBreakpoint bp(method_oop, location);
2276 
2277   JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2278   if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND)
2279     return JVMTI_ERROR_NOT_FOUND;
2280 
2281   if (TraceJVMTICalls) {
2282     jvmti_breakpoints.print();
2283   }
2284 
2285   return JVMTI_ERROR_NONE;
2286 } /* end ClearBreakpoint */
2287 
2288 
2289   //
2290   // Watched Field functions
2291   //
2292 
2293 jvmtiError
2294 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2295   // make sure we haven't set this watch before
2296   if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
2297   fdesc_ptr->set_is_field_access_watched(true);
2298 
2299   JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true);
2300 
2301   return JVMTI_ERROR_NONE;
2302 } /* end SetFieldAccessWatch */
2303 
2304 
2305 jvmtiError
2306 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2307   // make sure we have a watch to clear
2308   if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
2309   fdesc_ptr->set_is_field_access_watched(false);
2310 
2311   JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false);
2312 
2313   return JVMTI_ERROR_NONE;
2314 } /* end ClearFieldAccessWatch */
2315 
2316 
2317 jvmtiError
2318 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2319   // make sure we haven't set this watch before
2320   if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
2321   fdesc_ptr->set_is_field_modification_watched(true);
2322 
2323   JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true);
2324 
2325   return JVMTI_ERROR_NONE;
2326 } /* end SetFieldModificationWatch */
2327 
2328 
2329 jvmtiError
2330 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2331    // make sure we have a watch to clear
2332   if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
2333   fdesc_ptr->set_is_field_modification_watched(false);
2334 
2335   JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false);
2336 
2337   return JVMTI_ERROR_NONE;
2338 } /* end ClearFieldModificationWatch */
2339 
2340   //
2341   // Class functions
2342   //
2343 
2344 
2345 // k_mirror - may be primitive, this must be checked
2346 // signature_ptr - NULL is a valid value, must be checked
2347 // generic_ptr - NULL is a valid value, must be checked
2348 jvmtiError
2349 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
2350   ResourceMark rm;
2351   bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
2352   Klass* k = NULL;
2353   if (!isPrimitive) {
2354     k = java_lang_Class::as_Klass(k_mirror);
2355     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2356   }
2357   if (signature_ptr != NULL) {
2358     char* result = NULL;
2359     if (isPrimitive) {
2360       char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
2361       result = (char*) jvmtiMalloc(2);
2362       result[0] = tchar;
2363       result[1] = '\0';
2364     } else {
2365       const char* class_sig = k->signature_name();
2366       result = (char *) jvmtiMalloc(strlen(class_sig)+1);
2367       strcpy(result, class_sig);
2368     }
2369     *signature_ptr = result;
2370   }
2371   if (generic_ptr != NULL) {
2372     *generic_ptr = NULL;
2373     if (!isPrimitive && k->is_instance_klass()) {
2374       Symbol* soo = InstanceKlass::cast(k)->generic_signature();
2375       if (soo != NULL) {
2376         const char *gen_sig = soo->as_C_string();
2377         if (gen_sig != NULL) {
2378           char* gen_result;
2379           jvmtiError err = allocate(strlen(gen_sig) + 1,
2380                                     (unsigned char **)&gen_result);
2381           if (err != JVMTI_ERROR_NONE) {
2382             return err;
2383           }
2384           strcpy(gen_result, gen_sig);
2385           *generic_ptr = gen_result;
2386         }
2387       }
2388     }
2389   }
2390   return JVMTI_ERROR_NONE;
2391 } /* end GetClassSignature */
2392 
2393 
2394 // k_mirror - may be primitive, this must be checked
2395 // status_ptr - pre-checked for NULL
2396 jvmtiError
2397 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
2398   jint result = 0;
2399   if (java_lang_Class::is_primitive(k_mirror)) {
2400     result |= JVMTI_CLASS_STATUS_PRIMITIVE;
2401   } else {
2402     Klass* k = java_lang_Class::as_Klass(k_mirror);
2403     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2404     result = k->jvmti_class_status();
2405   }
2406   *status_ptr = result;
2407 
2408   return JVMTI_ERROR_NONE;
2409 } /* end GetClassStatus */
2410 
2411 
2412 // k_mirror - may be primitive, this must be checked
2413 // source_name_ptr - pre-checked for NULL
2414 jvmtiError
2415 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) {
2416   if (java_lang_Class::is_primitive(k_mirror)) {
2417      return JVMTI_ERROR_ABSENT_INFORMATION;
2418   }
2419   Klass* k_klass = java_lang_Class::as_Klass(k_mirror);
2420   NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
2421 
2422   if (!k_klass->is_instance_klass()) {
2423     return JVMTI_ERROR_ABSENT_INFORMATION;
2424   }
2425 
2426   Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name();
2427   NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION);
2428   {
2429     JavaThread* current_thread  = JavaThread::current();
2430     ResourceMark rm(current_thread);
2431     const char* sfncp = (const char*) sfnOop->as_C_string();
2432     *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1);
2433     strcpy(*source_name_ptr, sfncp);
2434   }
2435 
2436   return JVMTI_ERROR_NONE;
2437 } /* end GetSourceFileName */
2438 
2439 
2440 // k_mirror - may be primitive, this must be checked
2441 // modifiers_ptr - pre-checked for NULL
2442 jvmtiError
2443 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
2444   JavaThread* current_thread  = JavaThread::current();
2445   jint result = 0;
2446   if (!java_lang_Class::is_primitive(k_mirror)) {
2447     Klass* k = java_lang_Class::as_Klass(k_mirror);
2448     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2449     result = k->compute_modifier_flags(current_thread);
2450     JavaThread* THREAD = current_thread; // pass to macros
2451     if (HAS_PENDING_EXCEPTION) {
2452       CLEAR_PENDING_EXCEPTION;
2453       return JVMTI_ERROR_INTERNAL;
2454     };
2455 
2456     // Reset the deleted  ACC_SUPER bit ( deleted in compute_modifier_flags()).
2457     if(k->is_super()) {
2458       result |= JVM_ACC_SUPER;
2459     }
2460   } else {
2461     result = (JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
2462   }
2463   *modifiers_ptr = result;
2464 
2465   return JVMTI_ERROR_NONE;
2466 } /* end GetClassModifiers */
2467 
2468 
2469 // k_mirror - may be primitive, this must be checked
2470 // method_count_ptr - pre-checked for NULL
2471 // methods_ptr - pre-checked for NULL
2472 jvmtiError
2473 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
2474   JavaThread* current_thread  = JavaThread::current();
2475   HandleMark hm(current_thread);
2476 
2477   if (java_lang_Class::is_primitive(k_mirror)) {
2478     *method_count_ptr = 0;
2479     *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2480     return JVMTI_ERROR_NONE;
2481   }
2482   Klass* k = java_lang_Class::as_Klass(k_mirror);
2483   NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2484 
2485   // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2486   if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2487     return JVMTI_ERROR_CLASS_NOT_PREPARED;
2488   }
2489 
2490   if (!k->is_instance_klass()) {
2491     *method_count_ptr = 0;
2492     *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2493     return JVMTI_ERROR_NONE;
2494   }
2495   InstanceKlass* ik = InstanceKlass::cast(k);
2496   // Allocate the result and fill it in
2497   int result_length = ik->methods()->length();
2498   jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID));
2499   int index;
2500   bool jmethodids_found = true;
2501 
2502   if (JvmtiExport::can_maintain_original_method_order()) {
2503     // Use the original method ordering indices stored in the class, so we can emit
2504     // jmethodIDs in the order they appeared in the class file
2505     for (index = 0; index < result_length; index++) {
2506       Method* m = ik->methods()->at(index);
2507       int original_index = ik->method_ordering()->at(index);
2508       assert(original_index >= 0 && original_index < result_length, "invalid original method index");
2509       jmethodID id;
2510       if (jmethodids_found) {
2511         id = m->find_jmethod_id_or_null();
2512         if (id == NULL) {
2513           // If we find an uninitialized value, make sure there is
2514           // enough space for all the uninitialized values we might
2515           // find.
2516           ik->ensure_space_for_methodids(index);
2517           jmethodids_found = false;
2518           id = m->jmethod_id();
2519         }
2520       } else {
2521         id = m->jmethod_id();
2522       }
2523       result_list[original_index] = id;
2524     }
2525   } else {
2526     // otherwise just copy in any order
2527     for (index = 0; index < result_length; index++) {
2528       Method* m = ik->methods()->at(index);
2529       jmethodID id;
2530       if (jmethodids_found) {
2531         id = m->find_jmethod_id_or_null();
2532         if (id == NULL) {
2533           // If we find an uninitialized value, make sure there is
2534           // enough space for all the uninitialized values we might
2535           // find.
2536           ik->ensure_space_for_methodids(index);
2537           jmethodids_found = false;
2538           id = m->jmethod_id();
2539         }
2540       } else {
2541         id = m->jmethod_id();
2542       }
2543       result_list[index] = id;
2544     }
2545   }
2546   // Fill in return value.
2547   *method_count_ptr = result_length;
2548   *methods_ptr = result_list;
2549 
2550   return JVMTI_ERROR_NONE;
2551 } /* end GetClassMethods */
2552 
2553 
2554 // k_mirror - may be primitive, this must be checked
2555 // field_count_ptr - pre-checked for NULL
2556 // fields_ptr - pre-checked for NULL
2557 jvmtiError
2558 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) {
2559   if (java_lang_Class::is_primitive(k_mirror)) {
2560     *field_count_ptr = 0;
2561     *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2562     return JVMTI_ERROR_NONE;
2563   }
2564   JavaThread* current_thread = JavaThread::current();
2565   HandleMark hm(current_thread);
2566   Klass* k = java_lang_Class::as_Klass(k_mirror);
2567   NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2568 
2569   // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2570   if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2571     return JVMTI_ERROR_CLASS_NOT_PREPARED;
2572   }
2573 
2574   if (!k->is_instance_klass()) {
2575     *field_count_ptr = 0;
2576     *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2577     return JVMTI_ERROR_NONE;
2578   }
2579 
2580 
2581   InstanceKlass* ik = InstanceKlass::cast(k);
2582 
2583   int result_count = 0;
2584   // First, count the fields.
2585   FilteredFieldStream flds(ik, true, true);
2586   result_count = flds.field_count();
2587 
2588   // Allocate the result and fill it in
2589   jfieldID* result_list = (jfieldID*) jvmtiMalloc(result_count * sizeof(jfieldID));
2590   // The JVMTI spec requires fields in the order they occur in the class file,
2591   // this is the reverse order of what FieldStream hands out.
2592   int id_index = (result_count - 1);
2593 
2594   for (FilteredFieldStream src_st(ik, true, true); !src_st.eos(); src_st.next()) {
2595     result_list[id_index--] = jfieldIDWorkaround::to_jfieldID(
2596                                             ik, src_st.offset(),
2597                                             src_st.access_flags().is_static());
2598   }
2599   assert(id_index == -1, "just checking");
2600   // Fill in the results
2601   *field_count_ptr = result_count;
2602   *fields_ptr = result_list;
2603 
2604   return JVMTI_ERROR_NONE;
2605 } /* end GetClassFields */
2606 
2607 
2608 // k_mirror - may be primitive, this must be checked
2609 // interface_count_ptr - pre-checked for NULL
2610 // interfaces_ptr - pre-checked for NULL
2611 jvmtiError
2612 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
2613   {
2614     if (java_lang_Class::is_primitive(k_mirror)) {
2615       *interface_count_ptr = 0;
2616       *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2617       return JVMTI_ERROR_NONE;
2618     }
2619     JavaThread* current_thread = JavaThread::current();
2620     HandleMark hm(current_thread);
2621     Klass* k = java_lang_Class::as_Klass(k_mirror);
2622     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2623 
2624     // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2625     if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) ))
2626       return JVMTI_ERROR_CLASS_NOT_PREPARED;
2627 
2628     if (!k->is_instance_klass()) {
2629       *interface_count_ptr = 0;
2630       *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2631       return JVMTI_ERROR_NONE;
2632     }
2633 
2634     Array<InstanceKlass*>* interface_list = InstanceKlass::cast(k)->local_interfaces();
2635     const int result_length = (interface_list == NULL ? 0 : interface_list->length());
2636     jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass));
2637     for (int i_index = 0; i_index < result_length; i_index += 1) {
2638       InstanceKlass* klass_at = interface_list->at(i_index);
2639       assert(klass_at->is_klass(), "interfaces must be Klass*s");
2640       assert(klass_at->is_interface(), "interfaces must be interfaces");
2641       oop mirror_at = klass_at->java_mirror();
2642       Handle handle_at = Handle(current_thread, mirror_at);
2643       result_list[i_index] = (jclass) jni_reference(handle_at);
2644     }
2645     *interface_count_ptr = result_length;
2646     *interfaces_ptr = result_list;
2647   }
2648 
2649   return JVMTI_ERROR_NONE;
2650 } /* end GetImplementedInterfaces */
2651 
2652 
2653 // k_mirror - may be primitive, this must be checked
2654 // minor_version_ptr - pre-checked for NULL
2655 // major_version_ptr - pre-checked for NULL
2656 jvmtiError
2657 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) {
2658   if (java_lang_Class::is_primitive(k_mirror)) {
2659     return JVMTI_ERROR_ABSENT_INFORMATION;
2660   }
2661   Klass* klass = java_lang_Class::as_Klass(k_mirror);
2662 
2663   jint status = klass->jvmti_class_status();
2664   if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2665     return JVMTI_ERROR_INVALID_CLASS;
2666   }
2667   if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2668     return JVMTI_ERROR_ABSENT_INFORMATION;
2669   }
2670 
2671   InstanceKlass* ik = InstanceKlass::cast(klass);
2672   *minor_version_ptr = ik->minor_version();
2673   *major_version_ptr = ik->major_version();
2674 
2675   return JVMTI_ERROR_NONE;
2676 } /* end GetClassVersionNumbers */
2677 
2678 
2679 // k_mirror - may be primitive, this must be checked
2680 // constant_pool_count_ptr - pre-checked for NULL
2681 // constant_pool_byte_count_ptr - pre-checked for NULL
2682 // constant_pool_bytes_ptr - pre-checked for NULL
2683 jvmtiError
2684 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) {
2685   if (java_lang_Class::is_primitive(k_mirror)) {
2686     return JVMTI_ERROR_ABSENT_INFORMATION;
2687   }
2688 
2689   Klass* klass = java_lang_Class::as_Klass(k_mirror);
2690   Thread *thread = Thread::current();
2691   ResourceMark rm(thread);
2692 
2693   jint status = klass->jvmti_class_status();
2694   if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2695     return JVMTI_ERROR_INVALID_CLASS;
2696   }
2697   if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2698     return JVMTI_ERROR_ABSENT_INFORMATION;
2699   }
2700 
2701   InstanceKlass* ik = InstanceKlass::cast(klass);
2702   JvmtiConstantPoolReconstituter reconstituter(ik);
2703   if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2704     return reconstituter.get_error();
2705   }
2706 
2707   unsigned char *cpool_bytes;
2708   int cpool_size = reconstituter.cpool_size();
2709   if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2710     return reconstituter.get_error();
2711   }
2712   jvmtiError res = allocate(cpool_size, &cpool_bytes);
2713   if (res != JVMTI_ERROR_NONE) {
2714     return res;
2715   }
2716   reconstituter.copy_cpool_bytes(cpool_bytes);
2717   if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2718     return reconstituter.get_error();
2719   }
2720 
2721   constantPoolHandle  constants(thread, ik->constants());
2722   *constant_pool_count_ptr      = constants->length();
2723   *constant_pool_byte_count_ptr = cpool_size;
2724   *constant_pool_bytes_ptr      = cpool_bytes;
2725 
2726   return JVMTI_ERROR_NONE;
2727 } /* end GetConstantPool */
2728 
2729 
2730 // k_mirror - may be primitive, this must be checked
2731 // is_interface_ptr - pre-checked for NULL
2732 jvmtiError
2733 JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) {
2734   {
2735     bool result = false;
2736     if (!java_lang_Class::is_primitive(k_mirror)) {
2737       Klass* k = java_lang_Class::as_Klass(k_mirror);
2738       if (k != NULL && k->is_interface()) {
2739         result = true;
2740       }
2741     }
2742     *is_interface_ptr = result;
2743   }
2744 
2745   return JVMTI_ERROR_NONE;
2746 } /* end IsInterface */
2747 
2748 
2749 // k_mirror - may be primitive, this must be checked
2750 // is_array_class_ptr - pre-checked for NULL
2751 jvmtiError
2752 JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) {
2753   {
2754     bool result = false;
2755     if (!java_lang_Class::is_primitive(k_mirror)) {
2756       Klass* k = java_lang_Class::as_Klass(k_mirror);
2757       if (k != NULL && k->is_array_klass()) {
2758         result = true;
2759       }
2760     }
2761     *is_array_class_ptr = result;
2762   }
2763 
2764   return JVMTI_ERROR_NONE;
2765 } /* end IsArrayClass */
2766 
2767 
2768 // k_mirror - may be primitive, this must be checked
2769 // classloader_ptr - pre-checked for NULL
2770 jvmtiError
2771 JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) {
2772   {
2773     if (java_lang_Class::is_primitive(k_mirror)) {
2774       *classloader_ptr = (jclass) jni_reference(Handle());
2775       return JVMTI_ERROR_NONE;
2776     }
2777     JavaThread* current_thread = JavaThread::current();
2778     HandleMark hm(current_thread);
2779     Klass* k = java_lang_Class::as_Klass(k_mirror);
2780     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2781 
2782     oop result_oop = k->class_loader();
2783     if (result_oop == NULL) {
2784       *classloader_ptr = (jclass) jni_reference(Handle());
2785       return JVMTI_ERROR_NONE;
2786     }
2787     Handle result_handle = Handle(current_thread, result_oop);
2788     jclass result_jnihandle = (jclass) jni_reference(result_handle);
2789     *classloader_ptr = result_jnihandle;
2790   }
2791   return JVMTI_ERROR_NONE;
2792 } /* end GetClassLoader */
2793 
2794 
2795 // k_mirror - may be primitive, this must be checked
2796 // source_debug_extension_ptr - pre-checked for NULL
2797 jvmtiError
2798 JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) {
2799   {
2800     if (java_lang_Class::is_primitive(k_mirror)) {
2801       return JVMTI_ERROR_ABSENT_INFORMATION;
2802     }
2803     Klass* k = java_lang_Class::as_Klass(k_mirror);
2804     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2805     if (!k->is_instance_klass()) {
2806       return JVMTI_ERROR_ABSENT_INFORMATION;
2807     }
2808     const char* sde = InstanceKlass::cast(k)->source_debug_extension();
2809     NULL_CHECK(sde, JVMTI_ERROR_ABSENT_INFORMATION);
2810 
2811     {
2812       *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sde)+1);
2813       strcpy(*source_debug_extension_ptr, sde);
2814     }
2815   }
2816 
2817   return JVMTI_ERROR_NONE;
2818 } /* end GetSourceDebugExtension */
2819 
2820   //
2821   // Object functions
2822   //
2823 
2824 // hash_code_ptr - pre-checked for NULL
2825 jvmtiError
2826 JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) {
2827   oop mirror = JNIHandles::resolve_external_guard(object);
2828   NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
2829   NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER);
2830 
2831   {
2832     jint result = (jint) mirror->identity_hash();
2833     *hash_code_ptr = result;
2834   }
2835   return JVMTI_ERROR_NONE;
2836 } /* end GetObjectHashCode */
2837 
2838 
2839 // info_ptr - pre-checked for NULL
2840 jvmtiError
2841 JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) {
2842   // This needs to be performed at a safepoint to gather stable data
2843   // because monitor owner / waiters might not be suspended.
2844   VM_GetObjectMonitorUsage op(this, JavaThread::current(), object, info_ptr);
2845   VMThread::execute(&op);
2846   return op.result();
2847 } /* end GetObjectMonitorUsage */
2848 
2849 
2850   //
2851   // Field functions
2852   //
2853 
2854 // name_ptr - NULL is a valid value, must be checked
2855 // signature_ptr - NULL is a valid value, must be checked
2856 // generic_ptr - NULL is a valid value, must be checked
2857 jvmtiError
2858 JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) {
2859   JavaThread* current_thread  = JavaThread::current();
2860   ResourceMark rm(current_thread);
2861   if (name_ptr == NULL) {
2862     // just don't return the name
2863   } else {
2864     const char* fieldName = fdesc_ptr->name()->as_C_string();
2865     *name_ptr =  (char*) jvmtiMalloc(strlen(fieldName) + 1);
2866     if (*name_ptr == NULL)
2867       return JVMTI_ERROR_OUT_OF_MEMORY;
2868     strcpy(*name_ptr, fieldName);
2869   }
2870   if (signature_ptr== NULL) {
2871     // just don't return the signature
2872   } else {
2873     const char* fieldSignature = fdesc_ptr->signature()->as_C_string();
2874     *signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1);
2875     if (*signature_ptr == NULL)
2876       return JVMTI_ERROR_OUT_OF_MEMORY;
2877     strcpy(*signature_ptr, fieldSignature);
2878   }
2879   if (generic_ptr != NULL) {
2880     *generic_ptr = NULL;
2881     Symbol* soop = fdesc_ptr->generic_signature();
2882     if (soop != NULL) {
2883       const char* gen_sig = soop->as_C_string();
2884       if (gen_sig != NULL) {
2885         jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
2886         if (err != JVMTI_ERROR_NONE) {
2887           return err;
2888         }
2889         strcpy(*generic_ptr, gen_sig);
2890       }
2891     }
2892   }
2893   return JVMTI_ERROR_NONE;
2894 } /* end GetFieldName */
2895 
2896 
2897 // declaring_class_ptr - pre-checked for NULL
2898 jvmtiError
2899 JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) {
2900 
2901   *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder());
2902   return JVMTI_ERROR_NONE;
2903 } /* end GetFieldDeclaringClass */
2904 
2905 
2906 // modifiers_ptr - pre-checked for NULL
2907 jvmtiError
2908 JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) {
2909 
2910   AccessFlags resultFlags = fdesc_ptr->access_flags();
2911   jint result = resultFlags.as_int();
2912   *modifiers_ptr = result;
2913 
2914   return JVMTI_ERROR_NONE;
2915 } /* end GetFieldModifiers */
2916 
2917 
2918 // is_synthetic_ptr - pre-checked for NULL
2919 jvmtiError
2920 JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) {
2921   *is_synthetic_ptr = fdesc_ptr->is_synthetic();
2922   return JVMTI_ERROR_NONE;
2923 } /* end IsFieldSynthetic */
2924 
2925 
2926   //
2927   // Method functions
2928   //
2929 
2930 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2931 // name_ptr - NULL is a valid value, must be checked
2932 // signature_ptr - NULL is a valid value, must be checked
2933 // generic_ptr - NULL is a valid value, must be checked
2934 jvmtiError
2935 JvmtiEnv::GetMethodName(Method* method_oop, char** name_ptr, char** signature_ptr, char** generic_ptr) {
2936   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2937   JavaThread* current_thread  = JavaThread::current();
2938 
2939   ResourceMark rm(current_thread); // get the utf8 name and signature
2940   if (name_ptr == NULL) {
2941     // just don't return the name
2942   } else {
2943     const char* utf8_name = (const char *) method_oop->name()->as_utf8();
2944     *name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1);
2945     strcpy(*name_ptr, utf8_name);
2946   }
2947   if (signature_ptr == NULL) {
2948     // just don't return the signature
2949   } else {
2950     const char* utf8_signature = (const char *) method_oop->signature()->as_utf8();
2951     *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1);
2952     strcpy(*signature_ptr, utf8_signature);
2953   }
2954 
2955   if (generic_ptr != NULL) {
2956     *generic_ptr = NULL;
2957     Symbol* soop = method_oop->generic_signature();
2958     if (soop != NULL) {
2959       const char* gen_sig = soop->as_C_string();
2960       if (gen_sig != NULL) {
2961         jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
2962         if (err != JVMTI_ERROR_NONE) {
2963           return err;
2964         }
2965         strcpy(*generic_ptr, gen_sig);
2966       }
2967     }
2968   }
2969   return JVMTI_ERROR_NONE;
2970 } /* end GetMethodName */
2971 
2972 
2973 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2974 // declaring_class_ptr - pre-checked for NULL
2975 jvmtiError
2976 JvmtiEnv::GetMethodDeclaringClass(Method* method_oop, jclass* declaring_class_ptr) {
2977   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2978   (*declaring_class_ptr) = get_jni_class_non_null(method_oop->method_holder());
2979   return JVMTI_ERROR_NONE;
2980 } /* end GetMethodDeclaringClass */
2981 
2982 
2983 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2984 // modifiers_ptr - pre-checked for NULL
2985 jvmtiError
2986 JvmtiEnv::GetMethodModifiers(Method* method_oop, jint* modifiers_ptr) {
2987   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2988   (*modifiers_ptr) = method_oop->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2989   return JVMTI_ERROR_NONE;
2990 } /* end GetMethodModifiers */
2991 
2992 
2993 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2994 // max_ptr - pre-checked for NULL
2995 jvmtiError
2996 JvmtiEnv::GetMaxLocals(Method* method_oop, jint* max_ptr) {
2997   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2998   // get max stack
2999   (*max_ptr) = method_oop->max_locals();
3000   return JVMTI_ERROR_NONE;
3001 } /* end GetMaxLocals */
3002 
3003 
3004 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3005 // size_ptr - pre-checked for NULL
3006 jvmtiError
3007 JvmtiEnv::GetArgumentsSize(Method* method_oop, jint* size_ptr) {
3008   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3009   // get size of arguments
3010 
3011   (*size_ptr) = method_oop->size_of_parameters();
3012   return JVMTI_ERROR_NONE;
3013 } /* end GetArgumentsSize */
3014 
3015 
3016 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3017 // entry_count_ptr - pre-checked for NULL
3018 // table_ptr - pre-checked for NULL
3019 jvmtiError
3020 JvmtiEnv::GetLineNumberTable(Method* method_oop, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) {
3021   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3022   if (!method_oop->has_linenumber_table()) {
3023     return (JVMTI_ERROR_ABSENT_INFORMATION);
3024   }
3025 
3026   // The line number table is compressed so we don't know how big it is until decompressed.
3027   // Decompression is really fast so we just do it twice.
3028 
3029   // Compute size of table
3030   jint num_entries = 0;
3031   CompressedLineNumberReadStream stream(method_oop->compressed_linenumber_table());
3032   while (stream.read_pair()) {
3033     num_entries++;
3034   }
3035   jvmtiLineNumberEntry *jvmti_table =
3036             (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry)));
3037 
3038   // Fill jvmti table
3039   if (num_entries > 0) {
3040     int index = 0;
3041     CompressedLineNumberReadStream stream(method_oop->compressed_linenumber_table());
3042     while (stream.read_pair()) {
3043       jvmti_table[index].start_location = (jlocation) stream.bci();
3044       jvmti_table[index].line_number = (jint) stream.line();
3045       index++;
3046     }
3047     assert(index == num_entries, "sanity check");
3048   }
3049 
3050   // Set up results
3051   (*entry_count_ptr) = num_entries;
3052   (*table_ptr) = jvmti_table;
3053 
3054   return JVMTI_ERROR_NONE;
3055 } /* end GetLineNumberTable */
3056 
3057 
3058 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3059 // start_location_ptr - pre-checked for NULL
3060 // end_location_ptr - pre-checked for NULL
3061 jvmtiError
3062 JvmtiEnv::GetMethodLocation(Method* method_oop, jlocation* start_location_ptr, jlocation* end_location_ptr) {
3063 
3064   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3065   // get start and end location
3066   (*end_location_ptr) = (jlocation) (method_oop->code_size() - 1);
3067   if (method_oop->code_size() == 0) {
3068     // there is no code so there is no start location
3069     (*start_location_ptr) = (jlocation)(-1);
3070   } else {
3071     (*start_location_ptr) = (jlocation)(0);
3072   }
3073 
3074   return JVMTI_ERROR_NONE;
3075 } /* end GetMethodLocation */
3076 
3077 
3078 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3079 // entry_count_ptr - pre-checked for NULL
3080 // table_ptr - pre-checked for NULL
3081 jvmtiError
3082 JvmtiEnv::GetLocalVariableTable(Method* method_oop, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) {
3083 
3084   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3085   JavaThread* current_thread  = JavaThread::current();
3086 
3087   // does the klass have any local variable information?
3088   InstanceKlass* ik = method_oop->method_holder();
3089   if (!ik->access_flags().has_localvariable_table()) {
3090     return (JVMTI_ERROR_ABSENT_INFORMATION);
3091   }
3092 
3093   ConstantPool* constants = method_oop->constants();
3094   NULL_CHECK(constants, JVMTI_ERROR_ABSENT_INFORMATION);
3095 
3096   // in the vm localvariable table representation, 6 consecutive elements in the table
3097   // represent a 6-tuple of shorts
3098   // [start_pc, length, name_index, descriptor_index, signature_index, index]
3099   jint num_entries = method_oop->localvariable_table_length();
3100   jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *)
3101                 jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry)));
3102 
3103   if (num_entries > 0) {
3104     LocalVariableTableElement* table = method_oop->localvariable_table_start();
3105     for (int i = 0; i < num_entries; i++) {
3106       // get the 5 tuple information from the vm table
3107       jlocation start_location = (jlocation) table[i].start_bci;
3108       jint length = (jint) table[i].length;
3109       int name_index = (int) table[i].name_cp_index;
3110       int signature_index = (int) table[i].descriptor_cp_index;
3111       int generic_signature_index = (int) table[i].signature_cp_index;
3112       jint slot = (jint) table[i].slot;
3113 
3114       // get utf8 name and signature
3115       char *name_buf = NULL;
3116       char *sig_buf = NULL;
3117       char *gen_sig_buf = NULL;
3118       {
3119         ResourceMark rm(current_thread);
3120 
3121         const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8();
3122         name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3123         strcpy(name_buf, utf8_name);
3124 
3125         const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8();
3126         sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1);
3127         strcpy(sig_buf, utf8_signature);
3128 
3129         if (generic_signature_index > 0) {
3130           const char *utf8_gen_sign = (const char *)
3131                                        constants->symbol_at(generic_signature_index)->as_utf8();
3132           gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1);
3133           strcpy(gen_sig_buf, utf8_gen_sign);
3134         }
3135       }
3136 
3137       // fill in the jvmti local variable table
3138       jvmti_table[i].start_location = start_location;
3139       jvmti_table[i].length = length;
3140       jvmti_table[i].name = name_buf;
3141       jvmti_table[i].signature = sig_buf;
3142       jvmti_table[i].generic_signature = gen_sig_buf;
3143       jvmti_table[i].slot = slot;
3144     }
3145   }
3146 
3147   // set results
3148   (*entry_count_ptr) = num_entries;
3149   (*table_ptr) = jvmti_table;
3150 
3151   return JVMTI_ERROR_NONE;
3152 } /* end GetLocalVariableTable */
3153 
3154 
3155 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3156 // bytecode_count_ptr - pre-checked for NULL
3157 // bytecodes_ptr - pre-checked for NULL
3158 jvmtiError
3159 JvmtiEnv::GetBytecodes(Method* method_oop, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) {
3160   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3161 
3162   HandleMark hm;
3163   methodHandle method(Thread::current(), method_oop);
3164   jint size = (jint)method->code_size();
3165   jvmtiError err = allocate(size, bytecodes_ptr);
3166   if (err != JVMTI_ERROR_NONE) {
3167     return err;
3168   }
3169 
3170   (*bytecode_count_ptr) = size;
3171   // get byte codes
3172   JvmtiClassFileReconstituter::copy_bytecodes(method, *bytecodes_ptr);
3173 
3174   return JVMTI_ERROR_NONE;
3175 } /* end GetBytecodes */
3176 
3177 
3178 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3179 // is_native_ptr - pre-checked for NULL
3180 jvmtiError
3181 JvmtiEnv::IsMethodNative(Method* method_oop, jboolean* is_native_ptr) {
3182   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3183   (*is_native_ptr) = method_oop->is_native();
3184   return JVMTI_ERROR_NONE;
3185 } /* end IsMethodNative */
3186 
3187 
3188 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3189 // is_synthetic_ptr - pre-checked for NULL
3190 jvmtiError
3191 JvmtiEnv::IsMethodSynthetic(Method* method_oop, jboolean* is_synthetic_ptr) {
3192   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3193   (*is_synthetic_ptr) = method_oop->is_synthetic();
3194   return JVMTI_ERROR_NONE;
3195 } /* end IsMethodSynthetic */
3196 
3197 
3198 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3199 // is_obsolete_ptr - pre-checked for NULL
3200 jvmtiError
3201 JvmtiEnv::IsMethodObsolete(Method* method_oop, jboolean* is_obsolete_ptr) {
3202   if (use_version_1_0_semantics() &&
3203       get_capabilities()->can_redefine_classes == 0) {
3204     // This JvmtiEnv requested version 1.0 semantics and this function
3205     // requires the can_redefine_classes capability in version 1.0 so
3206     // we need to return an error here.
3207     return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3208   }
3209 
3210   if (method_oop == NULL || method_oop->is_obsolete()) {
3211     *is_obsolete_ptr = true;
3212   } else {
3213     *is_obsolete_ptr = false;
3214   }
3215   return JVMTI_ERROR_NONE;
3216 } /* end IsMethodObsolete */
3217 
3218   //
3219   // Raw Monitor functions
3220   //
3221 
3222 // name - pre-checked for NULL
3223 // monitor_ptr - pre-checked for NULL
3224 jvmtiError
3225 JvmtiEnv::CreateRawMonitor(const char* name, jrawMonitorID* monitor_ptr) {
3226   JvmtiRawMonitor* rmonitor = new JvmtiRawMonitor(name);
3227   NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY);
3228 
3229   *monitor_ptr = (jrawMonitorID)rmonitor;
3230 
3231   return JVMTI_ERROR_NONE;
3232 } /* end CreateRawMonitor */
3233 
3234 
3235 // rmonitor - pre-checked for validity
3236 jvmtiError
3237 JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) {
3238   if (Threads::number_of_threads() == 0) {
3239     // Remove this monitor from pending raw monitors list
3240     // if it has entered in onload or start phase.
3241     JvmtiPendingMonitors::destroy(rmonitor);
3242   } else {
3243     Thread* thread  = Thread::current();
3244     if (rmonitor->owner() == thread) {
3245       // The caller owns this monitor which we are about to destroy.
3246       // We exit the underlying synchronization object so that the
3247       // "delete monitor" call below can work without an assertion
3248       // failure on systems that don't like destroying synchronization
3249       // objects that are locked.
3250       int r;
3251       int recursion = rmonitor->recursions();
3252       for (int i = 0; i <= recursion; i++) {
3253         r = rmonitor->raw_exit(thread);
3254         assert(r == JvmtiRawMonitor::M_OK, "raw_exit should have worked");
3255         if (r != JvmtiRawMonitor::M_OK) {  // robustness
3256           return JVMTI_ERROR_INTERNAL;
3257         }
3258       }
3259     }
3260     if (rmonitor->owner() != NULL) {
3261       // The caller is trying to destroy a monitor that is locked by
3262       // someone else. While this is not forbidden by the JVMTI
3263       // spec, it will cause an assertion failure on systems that don't
3264       // like destroying synchronization objects that are locked.
3265       // We indicate a problem with the error return (and leak the
3266       // monitor's memory).
3267       return JVMTI_ERROR_NOT_MONITOR_OWNER;
3268     }
3269   }
3270 
3271   delete rmonitor;
3272 
3273   return JVMTI_ERROR_NONE;
3274 } /* end DestroyRawMonitor */
3275 
3276 
3277 // rmonitor - pre-checked for validity
3278 jvmtiError
3279 JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) {
3280   if (Threads::number_of_threads() == 0) {
3281     // No JavaThreads exist so JvmtiRawMonitor enter cannot be
3282     // used, add this raw monitor to the pending list.
3283     // The pending monitors will be actually entered when
3284     // the VM is setup.
3285     // See transition_pending_raw_monitors in create_vm()
3286     // in thread.cpp.
3287     JvmtiPendingMonitors::enter(rmonitor);
3288   } else {
3289     Thread* thread = Thread::current();
3290     if (thread->is_Java_thread()) {
3291       JavaThread* current_thread = (JavaThread*)thread;
3292 
3293       /* Transition to thread_blocked without entering vm state          */
3294       /* This is really evil. Normally you can't undo _thread_blocked    */
3295       /* transitions like this because it would cause us to miss a       */
3296       /* safepoint but since the thread was already in _thread_in_native */
3297       /* the thread is not leaving a safepoint safe state and it will    */
3298       /* block when it tries to return from native. We can't safepoint   */
3299       /* block in here because we could deadlock the vmthread. Blech.    */
3300 
3301       JavaThreadState state = current_thread->thread_state();
3302       assert(state == _thread_in_native, "Must be _thread_in_native");
3303       // frame should already be walkable since we are in native
3304       assert(!current_thread->has_last_Java_frame() ||
3305              current_thread->frame_anchor()->walkable(), "Must be walkable");
3306       current_thread->set_thread_state(_thread_blocked);
3307 
3308       rmonitor->raw_enter(current_thread);
3309       // restore state, still at a safepoint safe state
3310       current_thread->set_thread_state(state);
3311     } else {
3312       rmonitor->raw_enter(thread);
3313     }
3314   }
3315   return JVMTI_ERROR_NONE;
3316 } /* end RawMonitorEnter */
3317 
3318 
3319 // rmonitor - pre-checked for validity
3320 jvmtiError
3321 JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) {
3322   jvmtiError err = JVMTI_ERROR_NONE;
3323 
3324   if (Threads::number_of_threads() == 0) {
3325     // No JavaThreads exist so just remove this monitor from the pending list.
3326     // Bool value from exit is false if rmonitor is not in the list.
3327     if (!JvmtiPendingMonitors::exit(rmonitor)) {
3328       err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3329     }
3330   } else {
3331     Thread* thread = Thread::current();
3332     int r = rmonitor->raw_exit(thread);
3333     if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3334       err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3335     }
3336   }
3337   return err;
3338 } /* end RawMonitorExit */
3339 
3340 
3341 // rmonitor - pre-checked for validity
3342 jvmtiError
3343 JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) {
3344   Thread* thread = Thread::current();
3345   int r = rmonitor->raw_wait(millis, thread);
3346 
3347   switch (r) {
3348   case JvmtiRawMonitor::M_INTERRUPTED:
3349     return JVMTI_ERROR_INTERRUPT;
3350   case JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE:
3351     return JVMTI_ERROR_NOT_MONITOR_OWNER;
3352   default:
3353     return JVMTI_ERROR_NONE;
3354   }
3355 } /* end RawMonitorWait */
3356 
3357 
3358 // rmonitor - pre-checked for validity
3359 jvmtiError
3360 JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) {
3361   Thread* thread = Thread::current();
3362   int r = rmonitor->raw_notify(thread);
3363 
3364   if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3365     return JVMTI_ERROR_NOT_MONITOR_OWNER;
3366   }
3367   return JVMTI_ERROR_NONE;
3368 } /* end RawMonitorNotify */
3369 
3370 
3371 // rmonitor - pre-checked for validity
3372 jvmtiError
3373 JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) {
3374   Thread* thread = Thread::current();
3375   int r = rmonitor->raw_notifyAll(thread);
3376 
3377   if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3378     return JVMTI_ERROR_NOT_MONITOR_OWNER;
3379   }
3380   return JVMTI_ERROR_NONE;
3381 } /* end RawMonitorNotifyAll */
3382 
3383 
3384   //
3385   // JNI Function Interception functions
3386   //
3387 
3388 
3389 // function_table - pre-checked for NULL
3390 jvmtiError
3391 JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) {
3392   // Copy jni function table at safepoint.
3393   VM_JNIFunctionTableCopier copier(function_table);
3394   VMThread::execute(&copier);
3395 
3396   return JVMTI_ERROR_NONE;
3397 } /* end SetJNIFunctionTable */
3398 
3399 
3400 // function_table - pre-checked for NULL
3401 jvmtiError
3402 JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) {
3403   *function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface));
3404   if (*function_table == NULL)
3405     return JVMTI_ERROR_OUT_OF_MEMORY;
3406   memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface));
3407   return JVMTI_ERROR_NONE;
3408 } /* end GetJNIFunctionTable */
3409 
3410 
3411   //
3412   // Event Management functions
3413   //
3414 
3415 jvmtiError
3416 JvmtiEnv::GenerateEvents(jvmtiEvent event_type) {
3417   // can only generate two event types
3418   if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD &&
3419       event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) {
3420     return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3421   }
3422 
3423   // for compiled_method_load events we must check that the environment
3424   // has the can_generate_compiled_method_load_events capability.
3425   if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) {
3426     if (get_capabilities()->can_generate_compiled_method_load_events == 0) {
3427       return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3428     }
3429     return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this);
3430   } else {
3431     return JvmtiCodeBlobEvents::generate_dynamic_code_events(this);
3432   }
3433 
3434 } /* end GenerateEvents */
3435 
3436 
3437   //
3438   // Extension Mechanism functions
3439   //
3440 
3441 // extension_count_ptr - pre-checked for NULL
3442 // extensions - pre-checked for NULL
3443 jvmtiError
3444 JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) {
3445   return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions);
3446 } /* end GetExtensionFunctions */
3447 
3448 
3449 // extension_count_ptr - pre-checked for NULL
3450 // extensions - pre-checked for NULL
3451 jvmtiError
3452 JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) {
3453   return JvmtiExtensions::get_events(this, extension_count_ptr, extensions);
3454 } /* end GetExtensionEvents */
3455 
3456 
3457 // callback - NULL is a valid value, must be checked
3458 jvmtiError
3459 JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) {
3460   return JvmtiExtensions::set_event_callback(this, extension_event_index, callback);
3461 } /* end SetExtensionEventCallback */
3462 
3463   //
3464   // Timers functions
3465   //
3466 
3467 // info_ptr - pre-checked for NULL
3468 jvmtiError
3469 JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3470   os::current_thread_cpu_time_info(info_ptr);
3471   return JVMTI_ERROR_NONE;
3472 } /* end GetCurrentThreadCpuTimerInfo */
3473 
3474 
3475 // nanos_ptr - pre-checked for NULL
3476 jvmtiError
3477 JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) {
3478   *nanos_ptr = os::current_thread_cpu_time();
3479   return JVMTI_ERROR_NONE;
3480 } /* end GetCurrentThreadCpuTime */
3481 
3482 
3483 // info_ptr - pre-checked for NULL
3484 jvmtiError
3485 JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3486   os::thread_cpu_time_info(info_ptr);
3487   return JVMTI_ERROR_NONE;
3488 } /* end GetThreadCpuTimerInfo */
3489 
3490 
3491 // Threads_lock NOT held, java_thread not protected by lock
3492 // java_thread - pre-checked
3493 // nanos_ptr - pre-checked for NULL
3494 jvmtiError
3495 JvmtiEnv::GetThreadCpuTime(JavaThread* java_thread, jlong* nanos_ptr) {
3496   *nanos_ptr = os::thread_cpu_time(java_thread);
3497   return JVMTI_ERROR_NONE;
3498 } /* end GetThreadCpuTime */
3499 
3500 
3501 // info_ptr - pre-checked for NULL
3502 jvmtiError
3503 JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) {
3504   os::javaTimeNanos_info(info_ptr);
3505   return JVMTI_ERROR_NONE;
3506 } /* end GetTimerInfo */
3507 
3508 
3509 // nanos_ptr - pre-checked for NULL
3510 jvmtiError
3511 JvmtiEnv::GetTime(jlong* nanos_ptr) {
3512   *nanos_ptr = os::javaTimeNanos();
3513   return JVMTI_ERROR_NONE;
3514 } /* end GetTime */
3515 
3516 
3517 // processor_count_ptr - pre-checked for NULL
3518 jvmtiError
3519 JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) {
3520   *processor_count_ptr = os::active_processor_count();
3521   return JVMTI_ERROR_NONE;
3522 } /* end GetAvailableProcessors */
3523 
3524 jvmtiError
3525 JvmtiEnv::SetHeapSamplingInterval(jint sampling_interval) {
3526   if (sampling_interval < 0) {
3527     return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3528   }
3529   ThreadHeapSampler::set_sampling_interval(sampling_interval);
3530   return JVMTI_ERROR_NONE;
3531 } /* end SetHeapSamplingInterval */
3532 
3533   //
3534   // System Properties functions
3535   //
3536 
3537 // count_ptr - pre-checked for NULL
3538 // property_ptr - pre-checked for NULL
3539 jvmtiError
3540 JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) {
3541   jvmtiError err = JVMTI_ERROR_NONE;
3542 
3543   // Get the number of readable properties.
3544   *count_ptr = Arguments::PropertyList_readable_count(Arguments::system_properties());
3545 
3546   // Allocate memory to hold the exact number of readable properties.
3547   err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr);
3548   if (err != JVMTI_ERROR_NONE) {
3549     return err;
3550   }
3551   int readable_count = 0;
3552   // Loop through the system properties until all the readable properties are found.
3553   for (SystemProperty* p = Arguments::system_properties(); p != NULL && readable_count < *count_ptr; p = p->next()) {
3554     if (p->is_readable()) {
3555       const char *key = p->key();
3556       char **tmp_value = *property_ptr+readable_count;
3557       readable_count++;
3558       err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value);
3559       if (err == JVMTI_ERROR_NONE) {
3560         strcpy(*tmp_value, key);
3561       } else {
3562         // clean up previously allocated memory.
3563         for (int j = 0; j < readable_count; j++) {
3564           Deallocate((unsigned char*)*property_ptr+j);
3565         }
3566         Deallocate((unsigned char*)property_ptr);
3567         break;
3568       }
3569     }
3570   }
3571   assert(err != JVMTI_ERROR_NONE || readable_count == *count_ptr, "Bad readable property count");
3572   return err;
3573 } /* end GetSystemProperties */
3574 
3575 
3576 // property - pre-checked for NULL
3577 // value_ptr - pre-checked for NULL
3578 jvmtiError
3579 JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) {
3580   jvmtiError err = JVMTI_ERROR_NONE;
3581   const char *value;
3582 
3583   // Return JVMTI_ERROR_NOT_AVAILABLE if property is not readable or doesn't exist.
3584   value = Arguments::PropertyList_get_readable_value(Arguments::system_properties(), property);
3585   if (value == NULL) {
3586     err =  JVMTI_ERROR_NOT_AVAILABLE;
3587   } else {
3588     err = allocate((strlen(value)+1) * sizeof(char), (unsigned char **)value_ptr);
3589     if (err == JVMTI_ERROR_NONE) {
3590       strcpy(*value_ptr, value);
3591     }
3592   }
3593   return err;
3594 } /* end GetSystemProperty */
3595 
3596 
3597 // property - pre-checked for NULL
3598 // value - NULL is a valid value, must be checked
3599 jvmtiError
3600 JvmtiEnv::SetSystemProperty(const char* property, const char* value_ptr) {
3601   jvmtiError err =JVMTI_ERROR_NOT_AVAILABLE;
3602 
3603   for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
3604     if (strcmp(property, p->key()) == 0) {
3605       if (p->set_writeable_value(value_ptr)) {
3606         err =  JVMTI_ERROR_NONE;
3607       }
3608     }
3609   }
3610   return err;
3611 } /* end SetSystemProperty */