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 
 218   Handle h_loader (THREAD, JNIHandles::resolve(class_loader));
 219   // Check that loader is a subclass of java.lang.ClassLoader.
 220   if (h_loader.not_null() && !java_lang_ClassLoader::is_subclass(h_loader->klass())) {
 221     return JVMTI_ERROR_ILLEGAL_ARGUMENT;
 222   }
 223   jobject module = Modules::get_named_module(h_loader, package_name, THREAD);
 224   if (HAS_PENDING_EXCEPTION) {
 225     CLEAR_PENDING_EXCEPTION;
 226     return JVMTI_ERROR_INTERNAL; // unexpected exception
 227   }
 228   *module_ptr = module;
 229   return JVMTI_ERROR_NONE;
 230 } /* end GetNamedModule */
 231 
 232 
 233 // module - pre-checked for NULL
 234 // to_module - pre-checked for NULL
 235 jvmtiError
 236 JvmtiEnv::AddModuleReads(jobject module, jobject to_module) {
 237   JavaThread* THREAD = JavaThread::current();
 238 
 239   // check module
 240   Handle h_module(THREAD, JNIHandles::resolve(module));
 241   if (!java_lang_Module::is_instance(h_module())) {
 242     return JVMTI_ERROR_INVALID_MODULE;
 243   }
 244   // check to_module
 245   Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
 246   if (!java_lang_Module::is_instance(h_to_module())) {
 247     return JVMTI_ERROR_INVALID_MODULE;
 248   }
 249   return JvmtiExport::add_module_reads(h_module, h_to_module, THREAD);
 250 } /* end AddModuleReads */
 251 
 252 
 253 // module - pre-checked for NULL
 254 // pkg_name - pre-checked for NULL
 255 // to_module - pre-checked for NULL
 256 jvmtiError
 257 JvmtiEnv::AddModuleExports(jobject module, const char* pkg_name, jobject to_module) {
 258   JavaThread* THREAD = JavaThread::current();
 259   Handle h_pkg = java_lang_String::create_from_str(pkg_name, THREAD);
 260 
 261   // check module
 262   Handle h_module(THREAD, JNIHandles::resolve(module));
 263   if (!java_lang_Module::is_instance(h_module())) {
 264     return JVMTI_ERROR_INVALID_MODULE;
 265   }
 266   // check to_module
 267   Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
 268   if (!java_lang_Module::is_instance(h_to_module())) {
 269     return JVMTI_ERROR_INVALID_MODULE;
 270   }
 271   return JvmtiExport::add_module_exports(h_module, h_pkg, h_to_module, THREAD);
 272 } /* end AddModuleExports */
 273 
 274 
 275 // module - pre-checked for NULL
 276 // pkg_name - pre-checked for NULL
 277 // to_module - pre-checked for NULL
 278 jvmtiError
 279 JvmtiEnv::AddModuleOpens(jobject module, const char* pkg_name, jobject to_module) {
 280   JavaThread* THREAD = JavaThread::current();
 281   Handle h_pkg = java_lang_String::create_from_str(pkg_name, THREAD);
 282 
 283   // check module
 284   Handle h_module(THREAD, JNIHandles::resolve(module));
 285   if (!java_lang_Module::is_instance(h_module())) {
 286     return JVMTI_ERROR_INVALID_MODULE;
 287   }
 288   // check to_module
 289   Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
 290   if (!java_lang_Module::is_instance(h_to_module())) {
 291     return JVMTI_ERROR_INVALID_MODULE;
 292   }
 293   return JvmtiExport::add_module_opens(h_module, h_pkg, h_to_module, THREAD);
 294 } /* end AddModuleOpens */
 295 
 296 
 297 // module - pre-checked for NULL
 298 // service - pre-checked for NULL
 299 jvmtiError
 300 JvmtiEnv::AddModuleUses(jobject module, jclass service) {
 301   JavaThread* THREAD = JavaThread::current();
 302 
 303   // check module
 304   Handle h_module(THREAD, JNIHandles::resolve(module));
 305   if (!java_lang_Module::is_instance(h_module())) {
 306     return JVMTI_ERROR_INVALID_MODULE;
 307   }
 308   // check service
 309   Handle h_service(THREAD, JNIHandles::resolve_external_guard(service));
 310   if (!java_lang_Class::is_instance(h_service()) ||
 311       java_lang_Class::is_primitive(h_service())) {
 312     return JVMTI_ERROR_INVALID_CLASS;
 313   }
 314   return JvmtiExport::add_module_uses(h_module, h_service, THREAD);
 315 } /* end AddModuleUses */
 316 
 317 
 318 // module - pre-checked for NULL
 319 // service - pre-checked for NULL
 320 // impl_class - pre-checked for NULL
 321 jvmtiError
 322 JvmtiEnv::AddModuleProvides(jobject module, jclass service, jclass impl_class) {
 323   JavaThread* THREAD = JavaThread::current();
 324 
 325   // check module
 326   Handle h_module(THREAD, JNIHandles::resolve(module));
 327   if (!java_lang_Module::is_instance(h_module())) {
 328     return JVMTI_ERROR_INVALID_MODULE;
 329   }
 330   // check service
 331   Handle h_service(THREAD, JNIHandles::resolve_external_guard(service));
 332   if (!java_lang_Class::is_instance(h_service()) ||
 333       java_lang_Class::is_primitive(h_service())) {
 334     return JVMTI_ERROR_INVALID_CLASS;
 335   }
 336   // check impl_class
 337   Handle h_impl_class(THREAD, JNIHandles::resolve_external_guard(impl_class));
 338   if (!java_lang_Class::is_instance(h_impl_class()) ||
 339       java_lang_Class::is_primitive(h_impl_class())) {
 340     return JVMTI_ERROR_INVALID_CLASS;
 341   }
 342   return JvmtiExport::add_module_provides(h_module, h_service, h_impl_class, THREAD);
 343 } /* end AddModuleProvides */
 344 
 345 // module - pre-checked for NULL
 346 // is_modifiable_class_ptr - pre-checked for NULL
 347 jvmtiError
 348 JvmtiEnv::IsModifiableModule(jobject module, jboolean* is_modifiable_module_ptr) {
 349   JavaThread* THREAD = JavaThread::current();
 350 
 351   // check module
 352   Handle h_module(THREAD, JNIHandles::resolve(module));
 353   if (!java_lang_Module::is_instance(h_module())) {
 354     return JVMTI_ERROR_INVALID_MODULE;
 355   }
 356 
 357   *is_modifiable_module_ptr = JNI_TRUE;
 358   return JVMTI_ERROR_NONE;
 359 } /* end IsModifiableModule */
 360 
 361 
 362   //
 363   // Class functions
 364   //
 365 
 366 // class_count_ptr - pre-checked for NULL
 367 // classes_ptr - pre-checked for NULL
 368 jvmtiError
 369 JvmtiEnv::GetLoadedClasses(jint* class_count_ptr, jclass** classes_ptr) {
 370   return JvmtiGetLoadedClasses::getLoadedClasses(this, class_count_ptr, classes_ptr);
 371 } /* end GetLoadedClasses */
 372 
 373 
 374 // initiating_loader - NULL is a valid value, must be checked
 375 // class_count_ptr - pre-checked for NULL
 376 // classes_ptr - pre-checked for NULL
 377 jvmtiError
 378 JvmtiEnv::GetClassLoaderClasses(jobject initiating_loader, jint* class_count_ptr, jclass** classes_ptr) {
 379   return JvmtiGetLoadedClasses::getClassLoaderClasses(this, initiating_loader,
 380                                                   class_count_ptr, classes_ptr);
 381 } /* end GetClassLoaderClasses */
 382 
 383 // k_mirror - may be primitive, this must be checked
 384 // is_modifiable_class_ptr - pre-checked for NULL
 385 jvmtiError
 386 JvmtiEnv::IsModifiableClass(oop k_mirror, jboolean* is_modifiable_class_ptr) {
 387   *is_modifiable_class_ptr = VM_RedefineClasses::is_modifiable_class(k_mirror)?
 388                                                        JNI_TRUE : JNI_FALSE;
 389   return JVMTI_ERROR_NONE;
 390 } /* end IsModifiableClass */
 391 
 392 // class_count - pre-checked to be greater than or equal to 0
 393 // classes - pre-checked for NULL
 394 jvmtiError
 395 JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) {
 396 //TODO: add locking
 397 
 398   int index;
 399   JavaThread* current_thread = JavaThread::current();
 400   ResourceMark rm(current_thread);
 401 
 402   jvmtiClassDefinition* class_definitions =
 403                             NEW_RESOURCE_ARRAY(jvmtiClassDefinition, class_count);
 404   NULL_CHECK(class_definitions, JVMTI_ERROR_OUT_OF_MEMORY);
 405 
 406   for (index = 0; index < class_count; index++) {
 407     HandleMark hm(current_thread);
 408 
 409     jclass jcls = classes[index];
 410     oop k_mirror = JNIHandles::resolve_external_guard(jcls);
 411     if (k_mirror == NULL) {
 412       return JVMTI_ERROR_INVALID_CLASS;
 413     }
 414     if (!k_mirror->is_a(SystemDictionary::Class_klass())) {
 415       return JVMTI_ERROR_INVALID_CLASS;
 416     }
 417 
 418     if (!VM_RedefineClasses::is_modifiable_class(k_mirror)) {
 419       return JVMTI_ERROR_UNMODIFIABLE_CLASS;
 420     }
 421 
 422     Klass* klass = java_lang_Class::as_Klass(k_mirror);
 423 
 424     jint status = klass->jvmti_class_status();
 425     if (status & (JVMTI_CLASS_STATUS_ERROR)) {
 426       return JVMTI_ERROR_INVALID_CLASS;
 427     }
 428 
 429     InstanceKlass* ik = InstanceKlass::cast(klass);
 430     if (ik->get_cached_class_file_bytes() == NULL) {
 431       // Not cached, we need to reconstitute the class file from the
 432       // VM representation. We don't attach the reconstituted class
 433       // bytes to the InstanceKlass here because they have not been
 434       // validated and we're not at a safepoint.
 435       JvmtiClassFileReconstituter reconstituter(ik);
 436       if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
 437         return reconstituter.get_error();
 438       }
 439 
 440       class_definitions[index].class_byte_count = (jint)reconstituter.class_file_size();
 441       class_definitions[index].class_bytes      = (unsigned char*)
 442                                                        reconstituter.class_file_bytes();
 443     } else {
 444       // it is cached, get it from the cache
 445       class_definitions[index].class_byte_count = ik->get_cached_class_file_len();
 446       class_definitions[index].class_bytes      = ik->get_cached_class_file_bytes();
 447     }
 448     class_definitions[index].klass              = jcls;
 449   }
 450   EventRetransformClasses event;
 451   VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
 452   VMThread::execute(&op);
 453   jvmtiError error = op.check_error();
 454   if (error == JVMTI_ERROR_NONE) {
 455     event.set_classCount(class_count);
 456     event.set_redefinitionId(op.id());
 457     event.commit();
 458   }
 459   return error;
 460 } /* end RetransformClasses */
 461 
 462 
 463 // class_count - pre-checked to be greater than or equal to 0
 464 // class_definitions - pre-checked for NULL
 465 jvmtiError
 466 JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_definitions) {
 467 //TODO: add locking
 468   EventRedefineClasses event;
 469   VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
 470   VMThread::execute(&op);
 471   jvmtiError error = op.check_error();
 472   if (error == JVMTI_ERROR_NONE) {
 473     event.set_classCount(class_count);
 474     event.set_redefinitionId(op.id());
 475     event.commit();
 476   }
 477   return error;
 478 } /* end RedefineClasses */
 479 
 480 
 481   //
 482   // Object functions
 483   //
 484 
 485 // size_ptr - pre-checked for NULL
 486 jvmtiError
 487 JvmtiEnv::GetObjectSize(jobject object, jlong* size_ptr) {
 488   oop mirror = JNIHandles::resolve_external_guard(object);
 489   NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
 490   *size_ptr = (jlong)Universe::heap()->obj_size(mirror) * wordSize;
 491   return JVMTI_ERROR_NONE;
 492 } /* end GetObjectSize */
 493 
 494   //
 495   // Method functions
 496   //
 497 
 498 // prefix - NULL is a valid value, must be checked
 499 jvmtiError
 500 JvmtiEnv::SetNativeMethodPrefix(const char* prefix) {
 501   return prefix == NULL?
 502               SetNativeMethodPrefixes(0, NULL) :
 503               SetNativeMethodPrefixes(1, (char**)&prefix);
 504 } /* end SetNativeMethodPrefix */
 505 
 506 
 507 // prefix_count - pre-checked to be greater than or equal to 0
 508 // prefixes - pre-checked for NULL
 509 jvmtiError
 510 JvmtiEnv::SetNativeMethodPrefixes(jint prefix_count, char** prefixes) {
 511   // Have to grab JVMTI thread state lock to be sure that some thread
 512   // isn't accessing the prefixes at the same time we are setting them.
 513   // No locks during VM bring-up.
 514   if (Threads::number_of_threads() == 0) {
 515     return set_native_method_prefixes(prefix_count, prefixes);
 516   } else {
 517     MutexLocker mu(JvmtiThreadState_lock);
 518     return set_native_method_prefixes(prefix_count, prefixes);
 519   }
 520 } /* end SetNativeMethodPrefixes */
 521 
 522   //
 523   // Event Management functions
 524   //
 525 
 526 // callbacks - NULL is a valid value, must be checked
 527 // size_of_callbacks - pre-checked to be greater than or equal to 0
 528 jvmtiError
 529 JvmtiEnv::SetEventCallbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks) {
 530   JvmtiEventController::set_event_callbacks(this, callbacks, size_of_callbacks);
 531   return JVMTI_ERROR_NONE;
 532 } /* end SetEventCallbacks */
 533 
 534 
 535 // event_thread - NULL is a valid value, must be checked
 536 jvmtiError
 537 JvmtiEnv::SetEventNotificationMode(jvmtiEventMode mode, jvmtiEvent event_type, jthread event_thread,   ...) {
 538   if (event_thread == NULL) {
 539     // Can be called at Agent_OnLoad() time with event_thread == NULL
 540     // when Thread::current() does not work yet so we cannot create a
 541     // ThreadsListHandle that is common to both thread-specific and
 542     // global code paths.
 543 
 544     // event_type must be valid
 545     if (!JvmtiEventController::is_valid_event_type(event_type)) {
 546       return JVMTI_ERROR_INVALID_EVENT_TYPE;
 547     }
 548 
 549     bool enabled = (mode == JVMTI_ENABLE);
 550 
 551     // assure that needed capabilities are present
 552     if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) {
 553       return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
 554     }
 555 
 556     if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) {
 557       record_class_file_load_hook_enabled();
 558     }
 559 
 560     JvmtiEventController::set_user_enabled(this, (JavaThread*) NULL, event_type, enabled);
 561   } else {
 562     // We have a specified event_thread.
 563     JavaThread* java_thread = NULL;
 564     ThreadsListHandle tlh;
 565     jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), event_thread, &java_thread, NULL);
 566     if (err != JVMTI_ERROR_NONE) {
 567       return err;
 568     }
 569 
 570     // event_type must be valid
 571     if (!JvmtiEventController::is_valid_event_type(event_type)) {
 572       return JVMTI_ERROR_INVALID_EVENT_TYPE;
 573     }
 574 
 575     // global events cannot be controlled at thread level.
 576     if (JvmtiEventController::is_global_event(event_type)) {
 577       return JVMTI_ERROR_ILLEGAL_ARGUMENT;
 578     }
 579 
 580     bool enabled = (mode == JVMTI_ENABLE);
 581 
 582     // assure that needed capabilities are present
 583     if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) {
 584       return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
 585     }
 586 
 587     if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) {
 588       record_class_file_load_hook_enabled();
 589     }
 590     JvmtiEventController::set_user_enabled(this, java_thread, event_type, enabled);
 591   }
 592 
 593   return JVMTI_ERROR_NONE;
 594 } /* end SetEventNotificationMode */
 595 
 596   //
 597   // Capability functions
 598   //
 599 
 600 // capabilities_ptr - pre-checked for NULL
 601 jvmtiError
 602 JvmtiEnv::GetPotentialCapabilities(jvmtiCapabilities* capabilities_ptr) {
 603   JvmtiManageCapabilities::get_potential_capabilities(get_capabilities(),
 604                                                       get_prohibited_capabilities(),
 605                                                       capabilities_ptr);
 606   return JVMTI_ERROR_NONE;
 607 } /* end GetPotentialCapabilities */
 608 
 609 
 610 // capabilities_ptr - pre-checked for NULL
 611 jvmtiError
 612 JvmtiEnv::AddCapabilities(const jvmtiCapabilities* capabilities_ptr) {
 613   return JvmtiManageCapabilities::add_capabilities(get_capabilities(),
 614                                                    get_prohibited_capabilities(),
 615                                                    capabilities_ptr,
 616                                                    get_capabilities());
 617 } /* end AddCapabilities */
 618 
 619 
 620 // capabilities_ptr - pre-checked for NULL
 621 jvmtiError
 622 JvmtiEnv::RelinquishCapabilities(const jvmtiCapabilities* capabilities_ptr) {
 623   JvmtiManageCapabilities::relinquish_capabilities(get_capabilities(), capabilities_ptr, get_capabilities());
 624   return JVMTI_ERROR_NONE;
 625 } /* end RelinquishCapabilities */
 626 
 627 
 628 // capabilities_ptr - pre-checked for NULL
 629 jvmtiError
 630 JvmtiEnv::GetCapabilities(jvmtiCapabilities* capabilities_ptr) {
 631   JvmtiManageCapabilities::copy_capabilities(get_capabilities(), capabilities_ptr);
 632   return JVMTI_ERROR_NONE;
 633 } /* end GetCapabilities */
 634 
 635   //
 636   // Class Loader Search functions
 637   //
 638 
 639 // segment - pre-checked for NULL
 640 jvmtiError
 641 JvmtiEnv::AddToBootstrapClassLoaderSearch(const char* segment) {
 642   jvmtiPhase phase = get_phase();
 643   if (phase == JVMTI_PHASE_ONLOAD) {
 644     Arguments::append_sysclasspath(segment);
 645     return JVMTI_ERROR_NONE;
 646   } else if (use_version_1_0_semantics()) {
 647     // This JvmtiEnv requested version 1.0 semantics and this function
 648     // is only allowed in the ONLOAD phase in version 1.0 so we need to
 649     // return an error here.
 650     return JVMTI_ERROR_WRONG_PHASE;
 651   } else if (phase == JVMTI_PHASE_LIVE) {
 652     // The phase is checked by the wrapper that called this function,
 653     // but this thread could be racing with the thread that is
 654     // terminating the VM so we check one more time.
 655 
 656     // create the zip entry
 657     ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment, true);
 658     if (zip_entry == NULL) {
 659       return JVMTI_ERROR_ILLEGAL_ARGUMENT;
 660     }
 661 
 662     // lock the loader
 663     Thread* thread = Thread::current();
 664     HandleMark hm;
 665     Handle loader_lock = Handle(thread, SystemDictionary::system_loader_lock());
 666 
 667     ObjectLocker ol(loader_lock, thread);
 668 
 669     // add the jar file to the bootclasspath
 670     log_info(class, load)("opened: %s", zip_entry->name());
 671 #if INCLUDE_CDS
 672     ClassLoaderExt::append_boot_classpath(zip_entry);
 673 #else
 674     ClassLoader::add_to_boot_append_entries(zip_entry);
 675 #endif
 676     return JVMTI_ERROR_NONE;
 677   } else {
 678     return JVMTI_ERROR_WRONG_PHASE;
 679   }
 680 
 681 } /* end AddToBootstrapClassLoaderSearch */
 682 
 683 
 684 // segment - pre-checked for NULL
 685 jvmtiError
 686 JvmtiEnv::AddToSystemClassLoaderSearch(const char* segment) {
 687   jvmtiPhase phase = get_phase();
 688 
 689   if (phase == JVMTI_PHASE_ONLOAD) {
 690     for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
 691       if (strcmp("java.class.path", p->key()) == 0) {
 692         p->append_value(segment);
 693         break;
 694       }
 695     }
 696     return JVMTI_ERROR_NONE;
 697   } else if (phase == JVMTI_PHASE_LIVE) {
 698     // The phase is checked by the wrapper that called this function,
 699     // but this thread could be racing with the thread that is
 700     // terminating the VM so we check one more time.
 701     HandleMark hm;
 702 
 703     // create the zip entry (which will open the zip file and hence
 704     // check that the segment is indeed a zip file).
 705     ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment, false);
 706     if (zip_entry == NULL) {
 707       return JVMTI_ERROR_ILLEGAL_ARGUMENT;
 708     }
 709     delete zip_entry;   // no longer needed
 710 
 711     // lock the loader
 712     Thread* THREAD = Thread::current();
 713     Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
 714 
 715     ObjectLocker ol(loader, THREAD);
 716 
 717     // need the path as java.lang.String
 718     Handle path = java_lang_String::create_from_platform_dependent_str(segment, THREAD);
 719     if (HAS_PENDING_EXCEPTION) {
 720       CLEAR_PENDING_EXCEPTION;
 721       return JVMTI_ERROR_INTERNAL;
 722     }
 723 
 724     // Invoke the appendToClassPathForInstrumentation method - if the method
 725     // is not found it means the loader doesn't support adding to the class path
 726     // in the live phase.
 727     {
 728       JavaValue res(T_VOID);
 729       JavaCalls::call_special(&res,
 730                               loader,
 731                               loader->klass(),
 732                               vmSymbols::appendToClassPathForInstrumentation_name(),
 733                               vmSymbols::appendToClassPathForInstrumentation_signature(),
 734                               path,
 735                               THREAD);
 736       if (HAS_PENDING_EXCEPTION) {
 737         Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
 738         CLEAR_PENDING_EXCEPTION;
 739 
 740         if (ex_name == vmSymbols::java_lang_NoSuchMethodError()) {
 741           return JVMTI_ERROR_CLASS_LOADER_UNSUPPORTED;
 742         } else {
 743           return JVMTI_ERROR_INTERNAL;
 744         }
 745       }
 746     }
 747 
 748     return JVMTI_ERROR_NONE;
 749   } else {
 750     return JVMTI_ERROR_WRONG_PHASE;
 751   }
 752 } /* end AddToSystemClassLoaderSearch */
 753 
 754   //
 755   // General functions
 756   //
 757 
 758 // phase_ptr - pre-checked for NULL
 759 jvmtiError
 760 JvmtiEnv::GetPhase(jvmtiPhase* phase_ptr) {
 761   *phase_ptr = phase();
 762   return JVMTI_ERROR_NONE;
 763 } /* end GetPhase */
 764 
 765 
 766 jvmtiError
 767 JvmtiEnv::DisposeEnvironment() {
 768   dispose();
 769   return JVMTI_ERROR_NONE;
 770 } /* end DisposeEnvironment */
 771 
 772 
 773 // data - NULL is a valid value, must be checked
 774 jvmtiError
 775 JvmtiEnv::SetEnvironmentLocalStorage(const void* data) {
 776   set_env_local_storage(data);
 777   return JVMTI_ERROR_NONE;
 778 } /* end SetEnvironmentLocalStorage */
 779 
 780 
 781 // data_ptr - pre-checked for NULL
 782 jvmtiError
 783 JvmtiEnv::GetEnvironmentLocalStorage(void** data_ptr) {
 784   *data_ptr = (void*)get_env_local_storage();
 785   return JVMTI_ERROR_NONE;
 786 } /* end GetEnvironmentLocalStorage */
 787 
 788 // version_ptr - pre-checked for NULL
 789 jvmtiError
 790 JvmtiEnv::GetVersionNumber(jint* version_ptr) {
 791   *version_ptr = JVMTI_VERSION;
 792   return JVMTI_ERROR_NONE;
 793 } /* end GetVersionNumber */
 794 
 795 
 796 // name_ptr - pre-checked for NULL
 797 jvmtiError
 798 JvmtiEnv::GetErrorName(jvmtiError error, char** name_ptr) {
 799   if (error < JVMTI_ERROR_NONE || error > JVMTI_ERROR_MAX) {
 800     return JVMTI_ERROR_ILLEGAL_ARGUMENT;
 801   }
 802   const char *name = JvmtiUtil::error_name(error);
 803   if (name == NULL) {
 804     return JVMTI_ERROR_ILLEGAL_ARGUMENT;
 805   }
 806   size_t len = strlen(name) + 1;
 807   jvmtiError err = allocate(len, (unsigned char**)name_ptr);
 808   if (err == JVMTI_ERROR_NONE) {
 809     memcpy(*name_ptr, name, len);
 810   }
 811   return err;
 812 } /* end GetErrorName */
 813 
 814 
 815 jvmtiError
 816 JvmtiEnv::SetVerboseFlag(jvmtiVerboseFlag flag, jboolean value) {
 817   LogLevelType level = value == 0 ? LogLevel::Off : LogLevel::Info;
 818   switch (flag) {
 819   case JVMTI_VERBOSE_OTHER:
 820     // ignore
 821     break;
 822   case JVMTI_VERBOSE_CLASS:
 823     LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, unload));
 824     LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, load));
 825     break;
 826   case JVMTI_VERBOSE_GC:
 827     LogConfiguration::configure_stdout(level, true, LOG_TAGS(gc));
 828     break;
 829   case JVMTI_VERBOSE_JNI:
 830     level = value == 0 ? LogLevel::Off : LogLevel::Debug;
 831     LogConfiguration::configure_stdout(level, true, LOG_TAGS(jni, resolve));
 832     break;
 833   default:
 834     return JVMTI_ERROR_ILLEGAL_ARGUMENT;
 835   };
 836   return JVMTI_ERROR_NONE;
 837 } /* end SetVerboseFlag */
 838 
 839 
 840 // format_ptr - pre-checked for NULL
 841 jvmtiError
 842 JvmtiEnv::GetJLocationFormat(jvmtiJlocationFormat* format_ptr) {
 843   *format_ptr = JVMTI_JLOCATION_JVMBCI;
 844   return JVMTI_ERROR_NONE;
 845 } /* end GetJLocationFormat */
 846 
 847   //
 848   // Thread functions
 849   //
 850 
 851 // Threads_lock NOT held
 852 // thread - NOT pre-checked
 853 // thread_state_ptr - pre-checked for NULL
 854 jvmtiError
 855 JvmtiEnv::GetThreadState(jthread thread, jint* thread_state_ptr) {
 856   JavaThread* current_thread = JavaThread::current();
 857   JavaThread* java_thread = NULL;
 858   oop thread_oop = NULL;
 859   ThreadsListHandle tlh(current_thread);
 860 
 861   if (thread == NULL) {
 862     java_thread = current_thread;
 863     thread_oop = java_thread->threadObj();
 864 
 865     if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) {
 866       return JVMTI_ERROR_INVALID_THREAD;
 867     }
 868   } else {
 869     jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
 870     if (err != JVMTI_ERROR_NONE) {
 871       // We got an error code so we don't have a JavaThread *, but
 872       // only return an error from here if we didn't get a valid
 873       // thread_oop.
 874       if (thread_oop == NULL) {
 875         return err;
 876       }
 877       // We have a valid thread_oop so we can return some thread state.
 878     }
 879   }
 880 
 881   // get most state bits
 882   jint state = (jint)java_lang_Thread::get_thread_status(thread_oop);
 883 
 884   if (java_thread != NULL) {
 885     // We have a JavaThread* so add more state bits.
 886     JavaThreadState jts = java_thread->thread_state();
 887 
 888     if (java_thread->is_being_ext_suspended()) {
 889       state |= JVMTI_THREAD_STATE_SUSPENDED;
 890     }
 891     if (jts == _thread_in_native) {
 892       state |= JVMTI_THREAD_STATE_IN_NATIVE;
 893     }
 894     if (java_thread->is_interrupted(false)) {
 895       state |= JVMTI_THREAD_STATE_INTERRUPTED;
 896     }
 897   }
 898 
 899   *thread_state_ptr = state;
 900   return JVMTI_ERROR_NONE;
 901 } /* end GetThreadState */
 902 
 903 
 904 // thread_ptr - pre-checked for NULL
 905 jvmtiError
 906 JvmtiEnv::GetCurrentThread(jthread* thread_ptr) {
 907   JavaThread* current_thread  = JavaThread::current();
 908   *thread_ptr = (jthread)JNIHandles::make_local(current_thread, current_thread->threadObj());
 909   return JVMTI_ERROR_NONE;
 910 } /* end GetCurrentThread */
 911 
 912 
 913 // threads_count_ptr - pre-checked for NULL
 914 // threads_ptr - pre-checked for NULL
 915 jvmtiError
 916 JvmtiEnv::GetAllThreads(jint* threads_count_ptr, jthread** threads_ptr) {
 917   int nthreads        = 0;
 918   Handle *thread_objs = NULL;
 919   ResourceMark rm;
 920   HandleMark hm;
 921 
 922   // enumerate threads (including agent threads)
 923   ThreadsListEnumerator tle(Thread::current(), true);
 924   nthreads = tle.num_threads();
 925   *threads_count_ptr = nthreads;
 926 
 927   if (nthreads == 0) {
 928     *threads_ptr = NULL;
 929     return JVMTI_ERROR_NONE;
 930   }
 931 
 932   thread_objs = NEW_RESOURCE_ARRAY(Handle, nthreads);
 933   NULL_CHECK(thread_objs, JVMTI_ERROR_OUT_OF_MEMORY);
 934 
 935   for (int i = 0; i < nthreads; i++) {
 936     thread_objs[i] = Handle(tle.get_threadObj(i));
 937   }
 938 
 939   jthread *jthreads  = new_jthreadArray(nthreads, thread_objs);
 940   NULL_CHECK(jthreads, JVMTI_ERROR_OUT_OF_MEMORY);
 941 
 942   *threads_ptr = jthreads;
 943   return JVMTI_ERROR_NONE;
 944 } /* end GetAllThreads */
 945 
 946 
 947 // Threads_lock NOT held, java_thread not protected by lock
 948 // java_thread - pre-checked
 949 jvmtiError
 950 JvmtiEnv::SuspendThread(JavaThread* java_thread) {
 951   // don't allow hidden thread suspend request.
 952   if (java_thread->is_hidden_from_external_view()) {
 953     return (JVMTI_ERROR_NONE);
 954   }
 955 
 956   {
 957     MutexLocker ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag);
 958     if (java_thread->is_external_suspend()) {
 959       // don't allow nested external suspend requests.
 960       return (JVMTI_ERROR_THREAD_SUSPENDED);
 961     }
 962     if (java_thread->is_exiting()) { // thread is in the process of exiting
 963       return (JVMTI_ERROR_THREAD_NOT_ALIVE);
 964     }
 965     java_thread->set_external_suspend();
 966   }
 967 
 968   if (!JvmtiSuspendControl::suspend(java_thread)) {
 969     // the thread was in the process of exiting
 970     return (JVMTI_ERROR_THREAD_NOT_ALIVE);
 971   }
 972   return JVMTI_ERROR_NONE;
 973 } /* end SuspendThread */
 974 
 975 
 976 // request_count - pre-checked to be greater than or equal to 0
 977 // request_list - pre-checked for NULL
 978 // results - pre-checked for NULL
 979 jvmtiError
 980 JvmtiEnv::SuspendThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
 981   int needSafepoint = 0;  // > 0 if we need a safepoint
 982   ThreadsListHandle tlh;
 983   for (int i = 0; i < request_count; i++) {
 984     JavaThread *java_thread = NULL;
 985     jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), request_list[i], &java_thread, NULL);
 986     if (err != JVMTI_ERROR_NONE) {
 987       results[i] = err;
 988       continue;
 989     }
 990     // don't allow hidden thread suspend request.
 991     if (java_thread->is_hidden_from_external_view()) {
 992       results[i] = JVMTI_ERROR_NONE;  // indicate successful suspend
 993       continue;
 994     }
 995 
 996     {
 997       MutexLocker ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag);
 998       if (java_thread->is_external_suspend()) {
 999         // don't allow nested external suspend requests.
1000         results[i] = JVMTI_ERROR_THREAD_SUSPENDED;
1001         continue;
1002       }
1003       if (java_thread->is_exiting()) { // thread is in the process of exiting
1004         results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
1005         continue;
1006       }
1007       java_thread->set_external_suspend();
1008     }
1009     if (java_thread->thread_state() == _thread_in_native) {
1010       // We need to try and suspend native threads here. Threads in
1011       // other states will self-suspend on their next transition.
1012       if (!JvmtiSuspendControl::suspend(java_thread)) {
1013         // The thread was in the process of exiting. Force another
1014         // safepoint to make sure that this thread transitions.
1015         needSafepoint++;
1016         results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
1017         continue;
1018       }
1019     } else {
1020       needSafepoint++;
1021     }
1022     results[i] = JVMTI_ERROR_NONE;  // indicate successful suspend
1023   }
1024   if (needSafepoint > 0) {
1025     VM_ThreadsSuspendJVMTI tsj;
1026     VMThread::execute(&tsj);
1027   }
1028   // per-thread suspend results returned via results parameter
1029   return JVMTI_ERROR_NONE;
1030 } /* end SuspendThreadList */
1031 
1032 
1033 // Threads_lock NOT held, java_thread not protected by lock
1034 // java_thread - pre-checked
1035 jvmtiError
1036 JvmtiEnv::ResumeThread(JavaThread* java_thread) {
1037   // don't allow hidden thread resume request.
1038   if (java_thread->is_hidden_from_external_view()) {
1039     return JVMTI_ERROR_NONE;
1040   }
1041 
1042   if (!java_thread->is_being_ext_suspended()) {
1043     return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1044   }
1045 
1046   if (!JvmtiSuspendControl::resume(java_thread)) {
1047     return JVMTI_ERROR_INTERNAL;
1048   }
1049   return JVMTI_ERROR_NONE;
1050 } /* end ResumeThread */
1051 
1052 
1053 // request_count - pre-checked to be greater than or equal to 0
1054 // request_list - pre-checked for NULL
1055 // results - pre-checked for NULL
1056 jvmtiError
1057 JvmtiEnv::ResumeThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
1058   ThreadsListHandle tlh;
1059   for (int i = 0; i < request_count; i++) {
1060     JavaThread* java_thread = NULL;
1061     jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), request_list[i], &java_thread, NULL);
1062     if (err != JVMTI_ERROR_NONE) {
1063       results[i] = err;
1064       continue;
1065     }
1066     // don't allow hidden thread resume request.
1067     if (java_thread->is_hidden_from_external_view()) {
1068       results[i] = JVMTI_ERROR_NONE;  // indicate successful resume
1069       continue;
1070     }
1071     if (!java_thread->is_being_ext_suspended()) {
1072       results[i] = JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1073       continue;
1074     }
1075 
1076     if (!JvmtiSuspendControl::resume(java_thread)) {
1077       results[i] = JVMTI_ERROR_INTERNAL;
1078       continue;
1079     }
1080 
1081     results[i] = JVMTI_ERROR_NONE;  // indicate successful resume
1082   }
1083   // per-thread resume results returned via results parameter
1084   return JVMTI_ERROR_NONE;
1085 } /* end ResumeThreadList */
1086 
1087 
1088 // Threads_lock NOT held, java_thread not protected by lock
1089 // java_thread - pre-checked
1090 jvmtiError
1091 JvmtiEnv::StopThread(JavaThread* java_thread, jobject exception) {
1092   oop e = JNIHandles::resolve_external_guard(exception);
1093   NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER);
1094 
1095   JavaThread::send_async_exception(java_thread->threadObj(), e);
1096 
1097   return JVMTI_ERROR_NONE;
1098 
1099 } /* end StopThread */
1100 
1101 
1102 // Threads_lock NOT held
1103 // thread - NOT pre-checked
1104 jvmtiError
1105 JvmtiEnv::InterruptThread(jthread thread) {
1106   JavaThread* current_thread  = JavaThread::current();
1107   JavaThread* java_thread = NULL;
1108   ThreadsListHandle tlh(current_thread);
1109   jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, NULL);
1110   if (err != JVMTI_ERROR_NONE) {
1111     return err;
1112   }
1113   // Really this should be a Java call to Thread.interrupt to ensure the same
1114   // semantics, however historically this has not been done for some reason.
1115   // So we continue with that (which means we don't interact with any Java-level
1116   // Interruptible object) but we must set the Java-level interrupted state.
1117   java_lang_Thread::set_interrupted(JNIHandles::resolve(thread), true);
1118   java_thread->interrupt();
1119 
1120   return JVMTI_ERROR_NONE;
1121 } /* end InterruptThread */
1122 
1123 
1124 // Threads_lock NOT held
1125 // thread - NOT pre-checked
1126 // info_ptr - pre-checked for NULL
1127 jvmtiError
1128 JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) {
1129   ResourceMark rm;
1130   HandleMark hm;
1131 
1132   JavaThread* current_thread = JavaThread::current();
1133   ThreadsListHandle tlh(current_thread);
1134 
1135   // if thread is NULL the current thread is used
1136   oop thread_oop = NULL;
1137   if (thread == NULL) {
1138     thread_oop = current_thread->threadObj();
1139     if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) {
1140       return JVMTI_ERROR_INVALID_THREAD;
1141     }
1142   } else {
1143     JavaThread* java_thread = NULL;
1144     jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1145     if (err != JVMTI_ERROR_NONE) {
1146       // We got an error code so we don't have a JavaThread *, but
1147       // only return an error from here if we didn't get a valid
1148       // thread_oop.
1149       if (thread_oop == NULL) {
1150         return err;
1151       }
1152       // We have a valid thread_oop so we can return some thread info.
1153     }
1154   }
1155 
1156   Handle thread_obj(current_thread, thread_oop);
1157   Handle name;
1158   ThreadPriority priority;
1159   Handle     thread_group;
1160   Handle context_class_loader;
1161   bool          is_daemon;
1162 
1163   name = Handle(current_thread, java_lang_Thread::name(thread_obj()));
1164   priority = java_lang_Thread::priority(thread_obj());
1165   thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj()));
1166   is_daemon = java_lang_Thread::is_daemon(thread_obj());
1167 
1168   oop loader = java_lang_Thread::context_class_loader(thread_obj());
1169   context_class_loader = Handle(current_thread, loader);
1170 
1171   { const char *n;
1172 
1173     if (name() != NULL) {
1174       n = java_lang_String::as_utf8_string(name());
1175     } else {
1176       int utf8_length = 0;
1177       n = UNICODE::as_utf8((jchar*) NULL, utf8_length);
1178     }
1179 
1180     info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1);
1181     if (info_ptr->name == NULL)
1182       return JVMTI_ERROR_OUT_OF_MEMORY;
1183 
1184     strcpy(info_ptr->name, n);
1185   }
1186   info_ptr->is_daemon = is_daemon;
1187   info_ptr->priority  = priority;
1188 
1189   info_ptr->context_class_loader = (context_class_loader.is_null()) ? NULL :
1190                                      jni_reference(context_class_loader);
1191   info_ptr->thread_group = jni_reference(thread_group);
1192 
1193   return JVMTI_ERROR_NONE;
1194 } /* end GetThreadInfo */
1195 
1196 
1197 // Threads_lock NOT held, java_thread not protected by lock
1198 // java_thread - pre-checked
1199 // owned_monitor_count_ptr - pre-checked for NULL
1200 // owned_monitors_ptr - pre-checked for NULL
1201 jvmtiError
1202 JvmtiEnv::GetOwnedMonitorInfo(JavaThread* java_thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
1203   jvmtiError err = JVMTI_ERROR_NONE;
1204   JavaThread* calling_thread = JavaThread::current();
1205 
1206   // growable array of jvmti monitors info on the C-heap
1207   GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1208       new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, true);
1209 
1210   // It is only safe to perform the direct operation on the current
1211   // thread. All other usage needs to use a vm-safepoint-op for safety.
1212   if (java_thread == calling_thread) {
1213     err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1214   } else {
1215     // JVMTI get monitors info at safepoint. Do not require target thread to
1216     // be suspended.
1217     VM_GetOwnedMonitorInfo op(this, calling_thread, java_thread, owned_monitors_list);
1218     VMThread::execute(&op);
1219     err = op.result();
1220   }
1221   jint owned_monitor_count = owned_monitors_list->length();
1222   if (err == JVMTI_ERROR_NONE) {
1223     if ((err = allocate(owned_monitor_count * sizeof(jobject *),
1224                       (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) {
1225       // copy into the returned array
1226       for (int i = 0; i < owned_monitor_count; i++) {
1227         (*owned_monitors_ptr)[i] =
1228           ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1229       }
1230       *owned_monitor_count_ptr = owned_monitor_count;
1231     }
1232   }
1233   // clean up.
1234   for (int i = 0; i < owned_monitor_count; i++) {
1235     deallocate((unsigned char*)owned_monitors_list->at(i));
1236   }
1237   delete owned_monitors_list;
1238 
1239   return err;
1240 } /* end GetOwnedMonitorInfo */
1241 
1242 
1243 // Threads_lock NOT held, java_thread not protected by lock
1244 // java_thread - pre-checked
1245 // monitor_info_count_ptr - pre-checked for NULL
1246 // monitor_info_ptr - pre-checked for NULL
1247 jvmtiError
1248 JvmtiEnv::GetOwnedMonitorStackDepthInfo(JavaThread* java_thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
1249   jvmtiError err = JVMTI_ERROR_NONE;
1250   JavaThread* calling_thread  = JavaThread::current();
1251 
1252   // growable array of jvmti monitors info on the C-heap
1253   GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1254          new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, true);
1255 
1256   // It is only safe to perform the direct operation on the current
1257   // thread. All other usage needs to use a vm-safepoint-op for safety.
1258   if (java_thread == calling_thread) {
1259     err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1260   } else {
1261     // JVMTI get owned monitors info at safepoint. Do not require target thread to
1262     // be suspended.
1263     VM_GetOwnedMonitorInfo op(this, calling_thread, java_thread, owned_monitors_list);
1264     VMThread::execute(&op);
1265     err = op.result();
1266   }
1267 
1268   jint owned_monitor_count = owned_monitors_list->length();
1269   if (err == JVMTI_ERROR_NONE) {
1270     if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo),
1271                       (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) {
1272       // copy to output array.
1273       for (int i = 0; i < owned_monitor_count; i++) {
1274         (*monitor_info_ptr)[i].monitor =
1275           ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1276         (*monitor_info_ptr)[i].stack_depth =
1277           ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth;
1278       }
1279     }
1280     *monitor_info_count_ptr = owned_monitor_count;
1281   }
1282 
1283   // clean up.
1284   for (int i = 0; i < owned_monitor_count; i++) {
1285     deallocate((unsigned char*)owned_monitors_list->at(i));
1286   }
1287   delete owned_monitors_list;
1288 
1289   return err;
1290 } /* end GetOwnedMonitorStackDepthInfo */
1291 
1292 
1293 // Threads_lock NOT held, java_thread not protected by lock
1294 // java_thread - pre-checked
1295 // monitor_ptr - pre-checked for NULL
1296 jvmtiError
1297 JvmtiEnv::GetCurrentContendedMonitor(JavaThread* java_thread, jobject* monitor_ptr) {
1298   jvmtiError err = JVMTI_ERROR_NONE;
1299   JavaThread* calling_thread  = JavaThread::current();
1300 
1301   // It is only safe to perform the direct operation on the current
1302   // thread. All other usage needs to use a vm-safepoint-op for safety.
1303   if (java_thread == calling_thread) {
1304     err = get_current_contended_monitor(calling_thread, java_thread, monitor_ptr);
1305   } else {
1306     // get contended monitor information with handshake.
1307     GetOneCurrentContendedMonitor op(this, calling_thread, monitor_ptr);
1308     Handshake::execute(&op, java_thread);
1309     err = op.result();
1310   }
1311   return err;
1312 } /* end GetCurrentContendedMonitor */
1313 
1314 
1315 // Threads_lock NOT held
1316 // thread - NOT pre-checked
1317 // proc - pre-checked for NULL
1318 // arg - NULL is a valid value, must be checked
1319 jvmtiError
1320 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) {
1321   JavaThread* current_thread = JavaThread::current();
1322 
1323   JavaThread* java_thread = NULL;
1324   oop thread_oop = NULL;
1325   ThreadsListHandle tlh(current_thread);
1326   jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1327   if (err != JVMTI_ERROR_NONE) {
1328     // We got an error code so we don't have a JavaThread *, but
1329     // only return an error from here if we didn't get a valid
1330     // thread_oop.
1331     if (thread_oop == NULL) {
1332       return err;
1333     }
1334     // We have a valid thread_oop.
1335   }
1336 
1337   if (java_thread != NULL) {
1338     // 'thread' refers to an existing JavaThread.
1339     return JVMTI_ERROR_INVALID_THREAD;
1340   }
1341 
1342   if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) {
1343     return JVMTI_ERROR_INVALID_PRIORITY;
1344   }
1345 
1346   Handle thread_hndl(current_thread, thread_oop);
1347   {
1348     MutexLocker mu(current_thread, Threads_lock); // grab Threads_lock
1349 
1350     JvmtiAgentThread *new_thread = new JvmtiAgentThread(this, proc, arg);
1351 
1352     // At this point it may be possible that no osthread was created for the
1353     // JavaThread due to lack of memory.
1354     if (new_thread == NULL || new_thread->osthread() == NULL) {
1355       if (new_thread != NULL) {
1356         new_thread->smr_delete();
1357       }
1358       return JVMTI_ERROR_OUT_OF_MEMORY;
1359     }
1360 
1361     java_lang_Thread::set_thread(thread_hndl(), new_thread);
1362     java_lang_Thread::set_priority(thread_hndl(), (ThreadPriority)priority);
1363     java_lang_Thread::set_daemon(thread_hndl());
1364 
1365     new_thread->set_threadObj(thread_hndl());
1366     Threads::add(new_thread);
1367     Thread::start(new_thread);
1368   } // unlock Threads_lock
1369 
1370   return JVMTI_ERROR_NONE;
1371 } /* end RunAgentThread */
1372 
1373   //
1374   // Thread Group functions
1375   //
1376 
1377 // group_count_ptr - pre-checked for NULL
1378 // groups_ptr - pre-checked for NULL
1379 jvmtiError
1380 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) {
1381   JavaThread* current_thread = JavaThread::current();
1382 
1383   // Only one top level thread group now.
1384   *group_count_ptr = 1;
1385 
1386   // Allocate memory to store global-refs to the thread groups.
1387   // Assume this area is freed by caller.
1388   *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
1389 
1390   NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY);
1391 
1392   // Convert oop to Handle, then convert Handle to global-ref.
1393   {
1394     HandleMark hm(current_thread);
1395     Handle system_thread_group(current_thread, Universe::system_thread_group());
1396     *groups_ptr[0] = jni_reference(system_thread_group);
1397   }
1398 
1399   return JVMTI_ERROR_NONE;
1400 } /* end GetTopThreadGroups */
1401 
1402 
1403 // info_ptr - pre-checked for NULL
1404 jvmtiError
1405 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) {
1406   ResourceMark rm;
1407   HandleMark hm;
1408 
1409   JavaThread* current_thread = JavaThread::current();
1410 
1411   Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group));
1412   NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP);
1413 
1414   const char* name;
1415   Handle parent_group;
1416   bool is_daemon;
1417   ThreadPriority max_priority;
1418 
1419   name         = java_lang_ThreadGroup::name(group_obj());
1420   parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj()));
1421   is_daemon    = java_lang_ThreadGroup::is_daemon(group_obj());
1422   max_priority = java_lang_ThreadGroup::maxPriority(group_obj());
1423 
1424   info_ptr->is_daemon    = is_daemon;
1425   info_ptr->max_priority = max_priority;
1426   info_ptr->parent       = jni_reference(parent_group);
1427 
1428   if (name != NULL) {
1429     info_ptr->name = (char*)jvmtiMalloc(strlen(name)+1);
1430     NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY);
1431     strcpy(info_ptr->name, name);
1432   } else {
1433     info_ptr->name = NULL;
1434   }
1435 
1436   return JVMTI_ERROR_NONE;
1437 } /* end GetThreadGroupInfo */
1438 
1439 
1440 // thread_count_ptr - pre-checked for NULL
1441 // threads_ptr - pre-checked for NULL
1442 // group_count_ptr - pre-checked for NULL
1443 // groups_ptr - pre-checked for NULL
1444 jvmtiError
1445 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) {
1446   JavaThread* current_thread = JavaThread::current();
1447   oop group_obj = (oop) JNIHandles::resolve_external_guard(group);
1448   NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP);
1449 
1450   Handle *thread_objs = NULL;
1451   Handle *group_objs  = NULL;
1452   int nthreads = 0;
1453   int ngroups = 0;
1454   int hidden_threads = 0;
1455 
1456   ResourceMark rm(current_thread);
1457   HandleMark hm(current_thread);
1458 
1459   Handle group_hdl(current_thread, group_obj);
1460 
1461   { // Cannot allow thread or group counts to change.
1462     ObjectLocker ol(group_hdl, current_thread);
1463 
1464     nthreads = java_lang_ThreadGroup::nthreads(group_hdl());
1465     ngroups  = java_lang_ThreadGroup::ngroups(group_hdl());
1466 
1467     if (nthreads > 0) {
1468       ThreadsListHandle tlh(current_thread);
1469       objArrayOop threads = java_lang_ThreadGroup::threads(group_hdl());
1470       assert(nthreads <= threads->length(), "too many threads");
1471       thread_objs = NEW_RESOURCE_ARRAY(Handle,nthreads);
1472       for (int i = 0, j = 0; i < nthreads; i++) {
1473         oop thread_obj = threads->obj_at(i);
1474         assert(thread_obj != NULL, "thread_obj is NULL");
1475         JavaThread *java_thread = NULL;
1476         jvmtiError err = JvmtiExport::cv_oop_to_JavaThread(tlh.list(), thread_obj, &java_thread);
1477         if (err == JVMTI_ERROR_NONE) {
1478           // Have a valid JavaThread*.
1479           if (java_thread->is_hidden_from_external_view()) {
1480             // Filter out hidden java threads.
1481             hidden_threads++;
1482             continue;
1483           }
1484         } else {
1485           // We couldn't convert thread_obj into a JavaThread*.
1486           if (err == JVMTI_ERROR_INVALID_THREAD) {
1487             // The thread_obj does not refer to a java.lang.Thread object
1488             // so skip it.
1489             hidden_threads++;
1490             continue;
1491           }
1492           // We have a valid thread_obj, but no JavaThread*; the caller
1493           // can still have limited use for the thread_obj.
1494         }
1495         thread_objs[j++] = Handle(current_thread, thread_obj);
1496       }
1497       nthreads -= hidden_threads;
1498     } // ThreadsListHandle is destroyed here.
1499 
1500     if (ngroups > 0) {
1501       objArrayOop groups = java_lang_ThreadGroup::groups(group_hdl());
1502       assert(ngroups <= groups->length(), "too many groups");
1503       group_objs = NEW_RESOURCE_ARRAY(Handle,ngroups);
1504       for (int i = 0; i < ngroups; i++) {
1505         oop group_obj = groups->obj_at(i);
1506         assert(group_obj != NULL, "group_obj != NULL");
1507         group_objs[i] = Handle(current_thread, group_obj);
1508       }
1509     }
1510   } // ThreadGroup unlocked here
1511 
1512   *group_count_ptr  = ngroups;
1513   *thread_count_ptr = nthreads;
1514   *threads_ptr     = new_jthreadArray(nthreads, thread_objs);
1515   *groups_ptr      = new_jthreadGroupArray(ngroups, group_objs);
1516   if ((nthreads > 0) && (*threads_ptr == NULL)) {
1517     return JVMTI_ERROR_OUT_OF_MEMORY;
1518   }
1519   if ((ngroups > 0) && (*groups_ptr == NULL)) {
1520     return JVMTI_ERROR_OUT_OF_MEMORY;
1521   }
1522 
1523   return JVMTI_ERROR_NONE;
1524 } /* end GetThreadGroupChildren */
1525 
1526 
1527   //
1528   // Stack Frame functions
1529   //
1530 
1531 // Threads_lock NOT held, java_thread not protected by lock
1532 // java_thread - pre-checked
1533 // max_frame_count - pre-checked to be greater than or equal to 0
1534 // frame_buffer - pre-checked for NULL
1535 // count_ptr - pre-checked for NULL
1536 jvmtiError
1537 JvmtiEnv::GetStackTrace(JavaThread* java_thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
1538   jvmtiError err = JVMTI_ERROR_NONE;
1539 
1540   // It is only safe to perform the direct operation on the current
1541   // thread. All other usage needs to use a vm-safepoint-op for safety.
1542   if (java_thread == JavaThread::current()) {
1543     err = get_stack_trace(java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
1544   } else {
1545     // JVMTI get stack trace at safepoint. Do not require target thread to
1546     // be suspended.
1547     VM_GetStackTrace op(this, java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
1548     VMThread::execute(&op);
1549     err = op.result();
1550   }
1551 
1552   return err;
1553 } /* end GetStackTrace */
1554 
1555 
1556 // max_frame_count - pre-checked to be greater than or equal to 0
1557 // stack_info_ptr - pre-checked for NULL
1558 // thread_count_ptr - pre-checked for NULL
1559 jvmtiError
1560 JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) {
1561   jvmtiError err = JVMTI_ERROR_NONE;
1562   JavaThread* calling_thread = JavaThread::current();
1563 
1564   // JVMTI get stack traces at safepoint.
1565   VM_GetAllStackTraces op(this, calling_thread, max_frame_count);
1566   VMThread::execute(&op);
1567   *thread_count_ptr = op.final_thread_count();
1568   *stack_info_ptr = op.stack_info();
1569   err = op.result();
1570   return err;
1571 } /* end GetAllStackTraces */
1572 
1573 
1574 // thread_count - pre-checked to be greater than or equal to 0
1575 // thread_list - pre-checked for NULL
1576 // max_frame_count - pre-checked to be greater than or equal to 0
1577 // stack_info_ptr - pre-checked for NULL
1578 jvmtiError
1579 JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) {
1580   jvmtiError err = JVMTI_ERROR_NONE;
1581   // JVMTI get stack traces at safepoint.
1582   VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count);
1583   VMThread::execute(&op);
1584   err = op.result();
1585   if (err == JVMTI_ERROR_NONE) {
1586     *stack_info_ptr = op.stack_info();
1587   }
1588   return err;
1589 } /* end GetThreadListStackTraces */
1590 
1591 
1592 // Threads_lock NOT held, java_thread not protected by lock
1593 // java_thread - pre-checked
1594 // count_ptr - pre-checked for NULL
1595 jvmtiError
1596 JvmtiEnv::GetFrameCount(JavaThread* java_thread, jint* count_ptr) {
1597   jvmtiError err = JVMTI_ERROR_NONE;
1598 
1599   // retrieve or create JvmtiThreadState.
1600   JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1601   if (state == NULL) {
1602     return JVMTI_ERROR_THREAD_NOT_ALIVE;
1603   }
1604 
1605   // It is only safe to perform the direct operation on the current
1606   // thread. All other usage needs to use a vm-safepoint-op for safety.
1607   if (java_thread == JavaThread::current()) {
1608     err = get_frame_count(state, count_ptr);
1609   } else {
1610     // get java stack frame count at safepoint.
1611     VM_GetFrameCount op(this, state, count_ptr);
1612     VMThread::execute(&op);
1613     err = op.result();
1614   }
1615   return err;
1616 } /* end GetFrameCount */
1617 
1618 
1619 // Threads_lock NOT held, java_thread not protected by lock
1620 // java_thread - pre-checked
1621 jvmtiError
1622 JvmtiEnv::PopFrame(JavaThread* java_thread) {
1623   JavaThread* current_thread  = JavaThread::current();
1624   HandleMark hm(current_thread);
1625   uint32_t debug_bits = 0;
1626 
1627   // retrieve or create the state
1628   JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1629   if (state == NULL) {
1630     return JVMTI_ERROR_THREAD_NOT_ALIVE;
1631   }
1632 
1633   // Check if java_thread is fully suspended
1634   if (!java_thread->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) {
1635     return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1636   }
1637   // Check to see if a PopFrame was already in progress
1638   if (java_thread->popframe_condition() != JavaThread::popframe_inactive) {
1639     // Probably possible for JVMTI clients to trigger this, but the
1640     // JPDA backend shouldn't allow this to happen
1641     return JVMTI_ERROR_INTERNAL;
1642   }
1643 
1644   {
1645     // Was workaround bug
1646     //    4812902: popFrame hangs if the method is waiting at a synchronize
1647     // Catch this condition and return an error to avoid hanging.
1648     // Now JVMTI spec allows an implementation to bail out with an opaque frame error.
1649     OSThread* osThread = java_thread->osthread();
1650     if (osThread->get_state() == MONITOR_WAIT) {
1651       return JVMTI_ERROR_OPAQUE_FRAME;
1652     }
1653   }
1654 
1655   {
1656     ResourceMark rm(current_thread);
1657     // Check if there are more than one Java frame in this thread, that the top two frames
1658     // are Java (not native) frames, and that there is no intervening VM frame
1659     int frame_count = 0;
1660     bool is_interpreted[2];
1661     intptr_t *frame_sp[2];
1662     // The 2-nd arg of constructor is needed to stop iterating at java entry frame.
1663     for (vframeStream vfs(java_thread, true); !vfs.at_end(); vfs.next()) {
1664       methodHandle mh(current_thread, vfs.method());
1665       if (mh->is_native()) return(JVMTI_ERROR_OPAQUE_FRAME);
1666       is_interpreted[frame_count] = vfs.is_interpreted_frame();
1667       frame_sp[frame_count] = vfs.frame_id();
1668       if (++frame_count > 1) break;
1669     }
1670     if (frame_count < 2)  {
1671       // We haven't found two adjacent non-native Java frames on the top.
1672       // There can be two situations here:
1673       //  1. There are no more java frames
1674       //  2. Two top java frames are separated by non-java native frames
1675       if(vframeFor(java_thread, 1) == NULL) {
1676         return JVMTI_ERROR_NO_MORE_FRAMES;
1677       } else {
1678         // Intervening non-java native or VM frames separate java frames.
1679         // Current implementation does not support this. See bug #5031735.
1680         // In theory it is possible to pop frames in such cases.
1681         return JVMTI_ERROR_OPAQUE_FRAME;
1682       }
1683     }
1684 
1685     // If any of the top 2 frames is a compiled one, need to deoptimize it
1686     for (int i = 0; i < 2; i++) {
1687       if (!is_interpreted[i]) {
1688         Deoptimization::deoptimize_frame(java_thread, frame_sp[i]);
1689       }
1690     }
1691 
1692     // Update the thread state to reflect that the top frame is popped
1693     // so that cur_stack_depth is maintained properly and all frameIDs
1694     // are invalidated.
1695     // The current frame will be popped later when the suspended thread
1696     // is resumed and right before returning from VM to Java.
1697     // (see call_VM_base() in assembler_<cpu>.cpp).
1698 
1699     // It's fine to update the thread state here because no JVMTI events
1700     // shall be posted for this PopFrame.
1701 
1702     // It is only safe to perform the direct operation on the current
1703     // thread. All other usage needs to use a vm-safepoint-op for safety.
1704     if (java_thread == JavaThread::current()) {
1705       state->update_for_pop_top_frame();
1706     } else {
1707       VM_UpdateForPopTopFrame op(state);
1708       VMThread::execute(&op);
1709       jvmtiError err = op.result();
1710       if (err != JVMTI_ERROR_NONE) {
1711         return err;
1712       }
1713     }
1714 
1715     java_thread->set_popframe_condition(JavaThread::popframe_pending_bit);
1716     // Set pending step flag for this popframe and it is cleared when next
1717     // step event is posted.
1718     state->set_pending_step_for_popframe();
1719   }
1720 
1721   return JVMTI_ERROR_NONE;
1722 } /* end PopFrame */
1723 
1724 
1725 // Threads_lock NOT held, java_thread not protected by lock
1726 // java_thread - pre-checked
1727 // java_thread - unchecked
1728 // depth - pre-checked as non-negative
1729 // method_ptr - pre-checked for NULL
1730 // location_ptr - pre-checked for NULL
1731 jvmtiError
1732 JvmtiEnv::GetFrameLocation(JavaThread* java_thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) {
1733   jvmtiError err = JVMTI_ERROR_NONE;
1734 
1735   // It is only safe to perform the direct operation on the current
1736   // thread. All other usage needs to use a vm-safepoint-op for safety.
1737   if (java_thread == JavaThread::current()) {
1738     err = get_frame_location(java_thread, depth, method_ptr, location_ptr);
1739   } else {
1740     // JVMTI get java stack frame location at safepoint.
1741     VM_GetFrameLocation op(this, java_thread, depth, method_ptr, location_ptr);
1742     VMThread::execute(&op);
1743     err = op.result();
1744   }
1745   return err;
1746 } /* end GetFrameLocation */
1747 
1748 
1749 // Threads_lock NOT held, java_thread not protected by lock
1750 // java_thread - pre-checked
1751 // java_thread - unchecked
1752 // depth - pre-checked as non-negative
1753 jvmtiError
1754 JvmtiEnv::NotifyFramePop(JavaThread* java_thread, jint depth) {
1755   jvmtiError err = JVMTI_ERROR_NONE;
1756   ResourceMark rm;
1757   uint32_t debug_bits = 0;
1758 
1759   JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread);
1760   if (state == NULL) {
1761     return JVMTI_ERROR_THREAD_NOT_ALIVE;
1762   }
1763 
1764   if (!java_thread->is_thread_fully_suspended(true, &debug_bits)) {
1765     return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1766   }
1767 
1768   if (TraceJVMTICalls) {
1769     JvmtiSuspendControl::print();
1770   }
1771 
1772   vframe *vf = vframeFor(java_thread, depth);
1773   if (vf == NULL) {
1774     return JVMTI_ERROR_NO_MORE_FRAMES;
1775   }
1776 
1777   if (!vf->is_java_frame() || ((javaVFrame*) vf)->method()->is_native()) {
1778     return JVMTI_ERROR_OPAQUE_FRAME;
1779   }
1780 
1781   assert(vf->frame_pointer() != NULL, "frame pointer mustn't be NULL");
1782 
1783   // It is only safe to perform the direct operation on the current
1784   // thread. All other usage needs to use a vm-safepoint-op for safety.
1785   if (java_thread == JavaThread::current()) {
1786     int frame_number = state->count_frames() - depth;
1787     state->env_thread_state(this)->set_frame_pop(frame_number);
1788   } else {
1789     VM_SetFramePop op(this, state, depth);
1790     VMThread::execute(&op);
1791     err = op.result();
1792   }
1793   return err;
1794 } /* end NotifyFramePop */
1795 
1796 
1797   //
1798   // Force Early Return functions
1799   //
1800 
1801 // Threads_lock NOT held, java_thread not protected by lock
1802 // java_thread - pre-checked
1803 jvmtiError
1804 JvmtiEnv::ForceEarlyReturnObject(JavaThread* java_thread, jobject value) {
1805   jvalue val;
1806   val.l = value;
1807   return force_early_return(java_thread, val, atos);
1808 } /* end ForceEarlyReturnObject */
1809 
1810 
1811 // Threads_lock NOT held, java_thread not protected by lock
1812 // java_thread - pre-checked
1813 jvmtiError
1814 JvmtiEnv::ForceEarlyReturnInt(JavaThread* java_thread, jint value) {
1815   jvalue val;
1816   val.i = value;
1817   return force_early_return(java_thread, val, itos);
1818 } /* end ForceEarlyReturnInt */
1819 
1820 
1821 // Threads_lock NOT held, java_thread not protected by lock
1822 // java_thread - pre-checked
1823 jvmtiError
1824 JvmtiEnv::ForceEarlyReturnLong(JavaThread* java_thread, jlong value) {
1825   jvalue val;
1826   val.j = value;
1827   return force_early_return(java_thread, val, ltos);
1828 } /* end ForceEarlyReturnLong */
1829 
1830 
1831 // Threads_lock NOT held, java_thread not protected by lock
1832 // java_thread - pre-checked
1833 jvmtiError
1834 JvmtiEnv::ForceEarlyReturnFloat(JavaThread* java_thread, jfloat value) {
1835   jvalue val;
1836   val.f = value;
1837   return force_early_return(java_thread, val, ftos);
1838 } /* end ForceEarlyReturnFloat */
1839 
1840 
1841 // Threads_lock NOT held, java_thread not protected by lock
1842 // java_thread - pre-checked
1843 jvmtiError
1844 JvmtiEnv::ForceEarlyReturnDouble(JavaThread* java_thread, jdouble value) {
1845   jvalue val;
1846   val.d = value;
1847   return force_early_return(java_thread, val, dtos);
1848 } /* end ForceEarlyReturnDouble */
1849 
1850 
1851 // Threads_lock NOT held, java_thread not protected by lock
1852 // java_thread - pre-checked
1853 jvmtiError
1854 JvmtiEnv::ForceEarlyReturnVoid(JavaThread* java_thread) {
1855   jvalue val;
1856   val.j = 0L;
1857   return force_early_return(java_thread, val, vtos);
1858 } /* end ForceEarlyReturnVoid */
1859 
1860 
1861   //
1862   // Heap functions
1863   //
1864 
1865 // klass - NULL is a valid value, must be checked
1866 // initial_object - NULL is a valid value, must be checked
1867 // callbacks - pre-checked for NULL
1868 // user_data - NULL is a valid value, must be checked
1869 jvmtiError
1870 JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1871   // check klass if provided
1872   Klass* k = NULL;
1873   if (klass != NULL) {
1874     oop k_mirror = JNIHandles::resolve_external_guard(klass);
1875     if (k_mirror == NULL) {
1876       return JVMTI_ERROR_INVALID_CLASS;
1877     }
1878     if (java_lang_Class::is_primitive(k_mirror)) {
1879       return JVMTI_ERROR_NONE;
1880     }
1881     k = java_lang_Class::as_Klass(k_mirror);
1882     if (klass == NULL) {
1883       return JVMTI_ERROR_INVALID_CLASS;
1884     }
1885   }
1886 
1887   if (initial_object != NULL) {
1888     oop init_obj = JNIHandles::resolve_external_guard(initial_object);
1889     if (init_obj == NULL) {
1890       return JVMTI_ERROR_INVALID_OBJECT;
1891     }
1892   }
1893 
1894   Thread *thread = Thread::current();
1895   HandleMark hm(thread);
1896 
1897   TraceTime t("FollowReferences", TRACETIME_LOG(Debug, jvmti, objecttagging));
1898   JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, k, initial_object, callbacks, user_data);
1899   return JVMTI_ERROR_NONE;
1900 } /* end FollowReferences */
1901 
1902 
1903 // klass - NULL is a valid value, must be checked
1904 // callbacks - pre-checked for NULL
1905 // user_data - NULL is a valid value, must be checked
1906 jvmtiError
1907 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1908   // check klass if provided
1909   Klass* k = NULL;
1910   if (klass != NULL) {
1911     oop k_mirror = JNIHandles::resolve_external_guard(klass);
1912     if (k_mirror == NULL) {
1913       return JVMTI_ERROR_INVALID_CLASS;
1914     }
1915     if (java_lang_Class::is_primitive(k_mirror)) {
1916       return JVMTI_ERROR_NONE;
1917     }
1918     k = java_lang_Class::as_Klass(k_mirror);
1919     if (k == NULL) {
1920       return JVMTI_ERROR_INVALID_CLASS;
1921     }
1922   }
1923 
1924   TraceTime t("IterateThroughHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
1925   JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, k, callbacks, user_data);
1926   return JVMTI_ERROR_NONE;
1927 } /* end IterateThroughHeap */
1928 
1929 
1930 // tag_ptr - pre-checked for NULL
1931 jvmtiError
1932 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) {
1933   oop o = JNIHandles::resolve_external_guard(object);
1934   NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1935   *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object);
1936   return JVMTI_ERROR_NONE;
1937 } /* end GetTag */
1938 
1939 
1940 jvmtiError
1941 JvmtiEnv::SetTag(jobject object, jlong tag) {
1942   oop o = JNIHandles::resolve_external_guard(object);
1943   NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1944   JvmtiTagMap::tag_map_for(this)->set_tag(object, tag);
1945   return JVMTI_ERROR_NONE;
1946 } /* end SetTag */
1947 
1948 
1949 // tag_count - pre-checked to be greater than or equal to 0
1950 // tags - pre-checked for NULL
1951 // count_ptr - pre-checked for NULL
1952 // object_result_ptr - NULL is a valid value, must be checked
1953 // tag_result_ptr - NULL is a valid value, must be checked
1954 jvmtiError
1955 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
1956   TraceTime t("GetObjectsWithTags", TRACETIME_LOG(Debug, jvmti, objecttagging));
1957   return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
1958 } /* end GetObjectsWithTags */
1959 
1960 
1961 jvmtiError
1962 JvmtiEnv::ForceGarbageCollection() {
1963   Universe::heap()->collect(GCCause::_jvmti_force_gc);
1964   return JVMTI_ERROR_NONE;
1965 } /* end ForceGarbageCollection */
1966 
1967 
1968   //
1969   // Heap (1.0) functions
1970   //
1971 
1972 // object_reference_callback - pre-checked for NULL
1973 // user_data - NULL is a valid value, must be checked
1974 jvmtiError
1975 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) {
1976   oop o = JNIHandles::resolve_external_guard(object);
1977   NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1978   JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data);
1979   return JVMTI_ERROR_NONE;
1980 } /* end IterateOverObjectsReachableFromObject */
1981 
1982 
1983 // heap_root_callback - NULL is a valid value, must be checked
1984 // stack_ref_callback - NULL is a valid value, must be checked
1985 // object_ref_callback - NULL is a valid value, must be checked
1986 // user_data - NULL is a valid value, must be checked
1987 jvmtiError
1988 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) {
1989   TraceTime t("IterateOverReachableObjects", TRACETIME_LOG(Debug, jvmti, objecttagging));
1990   JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data);
1991   return JVMTI_ERROR_NONE;
1992 } /* end IterateOverReachableObjects */
1993 
1994 
1995 // heap_object_callback - pre-checked for NULL
1996 // user_data - NULL is a valid value, must be checked
1997 jvmtiError
1998 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
1999   TraceTime t("IterateOverHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
2000   Thread *thread = Thread::current();
2001   HandleMark hm(thread);
2002   JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, NULL, heap_object_callback, user_data);
2003   return JVMTI_ERROR_NONE;
2004 } /* end IterateOverHeap */
2005 
2006 
2007 // k_mirror - may be primitive, this must be checked
2008 // heap_object_callback - pre-checked for NULL
2009 // user_data - NULL is a valid value, must be checked
2010 jvmtiError
2011 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2012   if (java_lang_Class::is_primitive(k_mirror)) {
2013     // DO PRIMITIVE CLASS PROCESSING
2014     return JVMTI_ERROR_NONE;
2015   }
2016   Klass* klass = java_lang_Class::as_Klass(k_mirror);
2017   if (klass == NULL) {
2018     return JVMTI_ERROR_INVALID_CLASS;
2019   }
2020   TraceTime t("IterateOverInstancesOfClass", TRACETIME_LOG(Debug, jvmti, objecttagging));
2021   JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data);
2022   return JVMTI_ERROR_NONE;
2023 } /* end IterateOverInstancesOfClass */
2024 
2025 
2026   //
2027   // Local Variable functions
2028   //
2029 
2030 // Threads_lock NOT held, java_thread not protected by lock
2031 // java_thread - pre-checked
2032 // java_thread - unchecked
2033 // depth - pre-checked as non-negative
2034 // value_ptr - pre-checked for NULL
2035 jvmtiError
2036 JvmtiEnv::GetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject* value_ptr) {
2037   JavaThread* current_thread = JavaThread::current();
2038   // rm object is created to clean up the javaVFrame created in
2039   // doit_prologue(), but after doit() is finished with it.
2040   ResourceMark rm(current_thread);
2041 
2042   VM_GetOrSetLocal op(java_thread, current_thread, depth, slot);
2043   VMThread::execute(&op);
2044   jvmtiError err = op.result();
2045   if (err != JVMTI_ERROR_NONE) {
2046     return err;
2047   } else {
2048     *value_ptr = op.value().l;
2049     return JVMTI_ERROR_NONE;
2050   }
2051 } /* end GetLocalObject */
2052 
2053 // Threads_lock NOT held, java_thread not protected by lock
2054 // java_thread - pre-checked
2055 // java_thread - unchecked
2056 // depth - pre-checked as non-negative
2057 // value - pre-checked for NULL
2058 jvmtiError
2059 JvmtiEnv::GetLocalInstance(JavaThread* java_thread, jint depth, jobject* value_ptr){
2060   JavaThread* current_thread = JavaThread::current();
2061   // rm object is created to clean up the javaVFrame created in
2062   // doit_prologue(), but after doit() is finished with it.
2063   ResourceMark rm(current_thread);
2064 
2065   VM_GetReceiver op(java_thread, current_thread, depth);
2066   VMThread::execute(&op);
2067   jvmtiError err = op.result();
2068   if (err != JVMTI_ERROR_NONE) {
2069     return err;
2070   } else {
2071     *value_ptr = op.value().l;
2072     return JVMTI_ERROR_NONE;
2073   }
2074 } /* end GetLocalInstance */
2075 
2076 
2077 // Threads_lock NOT held, java_thread not protected by lock
2078 // java_thread - pre-checked
2079 // java_thread - unchecked
2080 // depth - pre-checked as non-negative
2081 // value_ptr - pre-checked for NULL
2082 jvmtiError
2083 JvmtiEnv::GetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint* value_ptr) {
2084   // rm object is created to clean up the javaVFrame created in
2085   // doit_prologue(), but after doit() is finished with it.
2086   ResourceMark rm;
2087 
2088   VM_GetOrSetLocal op(java_thread, depth, slot, T_INT);
2089   VMThread::execute(&op);
2090   *value_ptr = op.value().i;
2091   return op.result();
2092 } /* end GetLocalInt */
2093 
2094 
2095 // Threads_lock NOT held, java_thread not protected by lock
2096 // java_thread - pre-checked
2097 // java_thread - unchecked
2098 // depth - pre-checked as non-negative
2099 // value_ptr - pre-checked for NULL
2100 jvmtiError
2101 JvmtiEnv::GetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong* value_ptr) {
2102   // rm object is created to clean up the javaVFrame created in
2103   // doit_prologue(), but after doit() is finished with it.
2104   ResourceMark rm;
2105 
2106   VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG);
2107   VMThread::execute(&op);
2108   *value_ptr = op.value().j;
2109   return op.result();
2110 } /* end GetLocalLong */
2111 
2112 
2113 // Threads_lock NOT held, java_thread not protected by lock
2114 // java_thread - pre-checked
2115 // java_thread - unchecked
2116 // depth - pre-checked as non-negative
2117 // value_ptr - pre-checked for NULL
2118 jvmtiError
2119 JvmtiEnv::GetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat* value_ptr) {
2120   // rm object is created to clean up the javaVFrame created in
2121   // doit_prologue(), but after doit() is finished with it.
2122   ResourceMark rm;
2123 
2124   VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT);
2125   VMThread::execute(&op);
2126   *value_ptr = op.value().f;
2127   return op.result();
2128 } /* end GetLocalFloat */
2129 
2130 
2131 // Threads_lock NOT held, java_thread not protected by lock
2132 // java_thread - pre-checked
2133 // java_thread - unchecked
2134 // depth - pre-checked as non-negative
2135 // value_ptr - pre-checked for NULL
2136 jvmtiError
2137 JvmtiEnv::GetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble* value_ptr) {
2138   // rm object is created to clean up the javaVFrame created in
2139   // doit_prologue(), but after doit() is finished with it.
2140   ResourceMark rm;
2141 
2142   VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE);
2143   VMThread::execute(&op);
2144   *value_ptr = op.value().d;
2145   return op.result();
2146 } /* end GetLocalDouble */
2147 
2148 
2149 // Threads_lock NOT held, java_thread not protected by lock
2150 // java_thread - pre-checked
2151 // java_thread - unchecked
2152 // depth - pre-checked as non-negative
2153 jvmtiError
2154 JvmtiEnv::SetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject value) {
2155   // rm object is created to clean up the javaVFrame created in
2156   // doit_prologue(), but after doit() is finished with it.
2157   ResourceMark rm;
2158   jvalue val;
2159   val.l = value;
2160   VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val);
2161   VMThread::execute(&op);
2162   return op.result();
2163 } /* end SetLocalObject */
2164 
2165 
2166 // Threads_lock NOT held, java_thread not protected by lock
2167 // java_thread - pre-checked
2168 // java_thread - unchecked
2169 // depth - pre-checked as non-negative
2170 jvmtiError
2171 JvmtiEnv::SetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint value) {
2172   // rm object is created to clean up the javaVFrame created in
2173   // doit_prologue(), but after doit() is finished with it.
2174   ResourceMark rm;
2175   jvalue val;
2176   val.i = value;
2177   VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val);
2178   VMThread::execute(&op);
2179   return op.result();
2180 } /* end SetLocalInt */
2181 
2182 
2183 // Threads_lock NOT held, java_thread not protected by lock
2184 // java_thread - pre-checked
2185 // java_thread - unchecked
2186 // depth - pre-checked as non-negative
2187 jvmtiError
2188 JvmtiEnv::SetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong value) {
2189   // rm object is created to clean up the javaVFrame created in
2190   // doit_prologue(), but after doit() is finished with it.
2191   ResourceMark rm;
2192   jvalue val;
2193   val.j = value;
2194   VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val);
2195   VMThread::execute(&op);
2196   return op.result();
2197 } /* end SetLocalLong */
2198 
2199 
2200 // Threads_lock NOT held, java_thread not protected by lock
2201 // java_thread - pre-checked
2202 // java_thread - unchecked
2203 // depth - pre-checked as non-negative
2204 jvmtiError
2205 JvmtiEnv::SetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat value) {
2206   // rm object is created to clean up the javaVFrame created in
2207   // doit_prologue(), but after doit() is finished with it.
2208   ResourceMark rm;
2209   jvalue val;
2210   val.f = value;
2211   VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val);
2212   VMThread::execute(&op);
2213   return op.result();
2214 } /* end SetLocalFloat */
2215 
2216 
2217 // Threads_lock NOT held, java_thread not protected by lock
2218 // java_thread - pre-checked
2219 // java_thread - unchecked
2220 // depth - pre-checked as non-negative
2221 jvmtiError
2222 JvmtiEnv::SetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble value) {
2223   // rm object is created to clean up the javaVFrame created in
2224   // doit_prologue(), but after doit() is finished with it.
2225   ResourceMark rm;
2226   jvalue val;
2227   val.d = value;
2228   VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val);
2229   VMThread::execute(&op);
2230   return op.result();
2231 } /* end SetLocalDouble */
2232 
2233 
2234   //
2235   // Breakpoint functions
2236   //
2237 
2238 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2239 jvmtiError
2240 JvmtiEnv::SetBreakpoint(Method* method_oop, jlocation location) {
2241   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2242   if (location < 0) {   // simple invalid location check first
2243     return JVMTI_ERROR_INVALID_LOCATION;
2244   }
2245   // verify that the breakpoint is not past the end of the method
2246   if (location >= (jlocation) method_oop->code_size()) {
2247     return JVMTI_ERROR_INVALID_LOCATION;
2248   }
2249 
2250   ResourceMark rm;
2251   JvmtiBreakpoint bp(method_oop, location);
2252   JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2253   if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE)
2254     return JVMTI_ERROR_DUPLICATE;
2255 
2256   if (TraceJVMTICalls) {
2257     jvmti_breakpoints.print();
2258   }
2259 
2260   return JVMTI_ERROR_NONE;
2261 } /* end SetBreakpoint */
2262 
2263 
2264 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2265 jvmtiError
2266 JvmtiEnv::ClearBreakpoint(Method* method_oop, jlocation location) {
2267   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2268 
2269   if (location < 0) {   // simple invalid location check first
2270     return JVMTI_ERROR_INVALID_LOCATION;
2271   }
2272 
2273   // verify that the breakpoint is not past the end of the method
2274   if (location >= (jlocation) method_oop->code_size()) {
2275     return JVMTI_ERROR_INVALID_LOCATION;
2276   }
2277 
2278   JvmtiBreakpoint bp(method_oop, location);
2279 
2280   JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2281   if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND)
2282     return JVMTI_ERROR_NOT_FOUND;
2283 
2284   if (TraceJVMTICalls) {
2285     jvmti_breakpoints.print();
2286   }
2287 
2288   return JVMTI_ERROR_NONE;
2289 } /* end ClearBreakpoint */
2290 
2291 
2292   //
2293   // Watched Field functions
2294   //
2295 
2296 jvmtiError
2297 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2298   // make sure we haven't set this watch before
2299   if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
2300   fdesc_ptr->set_is_field_access_watched(true);
2301 
2302   JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true);
2303 
2304   return JVMTI_ERROR_NONE;
2305 } /* end SetFieldAccessWatch */
2306 
2307 
2308 jvmtiError
2309 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2310   // make sure we have a watch to clear
2311   if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
2312   fdesc_ptr->set_is_field_access_watched(false);
2313 
2314   JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false);
2315 
2316   return JVMTI_ERROR_NONE;
2317 } /* end ClearFieldAccessWatch */
2318 
2319 
2320 jvmtiError
2321 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2322   // make sure we haven't set this watch before
2323   if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
2324   fdesc_ptr->set_is_field_modification_watched(true);
2325 
2326   JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true);
2327 
2328   return JVMTI_ERROR_NONE;
2329 } /* end SetFieldModificationWatch */
2330 
2331 
2332 jvmtiError
2333 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2334    // make sure we have a watch to clear
2335   if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
2336   fdesc_ptr->set_is_field_modification_watched(false);
2337 
2338   JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false);
2339 
2340   return JVMTI_ERROR_NONE;
2341 } /* end ClearFieldModificationWatch */
2342 
2343   //
2344   // Class functions
2345   //
2346 
2347 
2348 // k_mirror - may be primitive, this must be checked
2349 // signature_ptr - NULL is a valid value, must be checked
2350 // generic_ptr - NULL is a valid value, must be checked
2351 jvmtiError
2352 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
2353   ResourceMark rm;
2354   bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
2355   Klass* k = NULL;
2356   if (!isPrimitive) {
2357     k = java_lang_Class::as_Klass(k_mirror);
2358     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2359   }
2360   if (signature_ptr != NULL) {
2361     char* result = NULL;
2362     if (isPrimitive) {
2363       char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
2364       result = (char*) jvmtiMalloc(2);
2365       result[0] = tchar;
2366       result[1] = '\0';
2367     } else {
2368       const char* class_sig = k->signature_name();
2369       result = (char *) jvmtiMalloc(strlen(class_sig)+1);
2370       strcpy(result, class_sig);
2371     }
2372     *signature_ptr = result;
2373   }
2374   if (generic_ptr != NULL) {
2375     *generic_ptr = NULL;
2376     if (!isPrimitive && k->is_instance_klass()) {
2377       Symbol* soo = InstanceKlass::cast(k)->generic_signature();
2378       if (soo != NULL) {
2379         const char *gen_sig = soo->as_C_string();
2380         if (gen_sig != NULL) {
2381           char* gen_result;
2382           jvmtiError err = allocate(strlen(gen_sig) + 1,
2383                                     (unsigned char **)&gen_result);
2384           if (err != JVMTI_ERROR_NONE) {
2385             return err;
2386           }
2387           strcpy(gen_result, gen_sig);
2388           *generic_ptr = gen_result;
2389         }
2390       }
2391     }
2392   }
2393   return JVMTI_ERROR_NONE;
2394 } /* end GetClassSignature */
2395 
2396 
2397 // k_mirror - may be primitive, this must be checked
2398 // status_ptr - pre-checked for NULL
2399 jvmtiError
2400 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
2401   jint result = 0;
2402   if (java_lang_Class::is_primitive(k_mirror)) {
2403     result |= JVMTI_CLASS_STATUS_PRIMITIVE;
2404   } else {
2405     Klass* k = java_lang_Class::as_Klass(k_mirror);
2406     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2407     result = k->jvmti_class_status();
2408   }
2409   *status_ptr = result;
2410 
2411   return JVMTI_ERROR_NONE;
2412 } /* end GetClassStatus */
2413 
2414 
2415 // k_mirror - may be primitive, this must be checked
2416 // source_name_ptr - pre-checked for NULL
2417 jvmtiError
2418 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) {
2419   if (java_lang_Class::is_primitive(k_mirror)) {
2420      return JVMTI_ERROR_ABSENT_INFORMATION;
2421   }
2422   Klass* k_klass = java_lang_Class::as_Klass(k_mirror);
2423   NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
2424 
2425   if (!k_klass->is_instance_klass()) {
2426     return JVMTI_ERROR_ABSENT_INFORMATION;
2427   }
2428 
2429   Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name();
2430   NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION);
2431   {
2432     JavaThread* current_thread  = JavaThread::current();
2433     ResourceMark rm(current_thread);
2434     const char* sfncp = (const char*) sfnOop->as_C_string();
2435     *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1);
2436     strcpy(*source_name_ptr, sfncp);
2437   }
2438 
2439   return JVMTI_ERROR_NONE;
2440 } /* end GetSourceFileName */
2441 
2442 
2443 // k_mirror - may be primitive, this must be checked
2444 // modifiers_ptr - pre-checked for NULL
2445 jvmtiError
2446 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
2447   JavaThread* current_thread  = JavaThread::current();
2448   jint result = 0;
2449   if (!java_lang_Class::is_primitive(k_mirror)) {
2450     Klass* k = java_lang_Class::as_Klass(k_mirror);
2451     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2452     result = k->compute_modifier_flags(current_thread);
2453     JavaThread* THREAD = current_thread; // pass to macros
2454     if (HAS_PENDING_EXCEPTION) {
2455       CLEAR_PENDING_EXCEPTION;
2456       return JVMTI_ERROR_INTERNAL;
2457     };
2458 
2459     // Reset the deleted  ACC_SUPER bit ( deleted in compute_modifier_flags()).
2460     if(k->is_super()) {
2461       result |= JVM_ACC_SUPER;
2462     }
2463   } else {
2464     result = (JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
2465   }
2466   *modifiers_ptr = result;
2467 
2468   return JVMTI_ERROR_NONE;
2469 } /* end GetClassModifiers */
2470 
2471 
2472 // k_mirror - may be primitive, this must be checked
2473 // method_count_ptr - pre-checked for NULL
2474 // methods_ptr - pre-checked for NULL
2475 jvmtiError
2476 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
2477   JavaThread* current_thread  = JavaThread::current();
2478   HandleMark hm(current_thread);
2479 
2480   if (java_lang_Class::is_primitive(k_mirror)) {
2481     *method_count_ptr = 0;
2482     *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2483     return JVMTI_ERROR_NONE;
2484   }
2485   Klass* k = java_lang_Class::as_Klass(k_mirror);
2486   NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2487 
2488   // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2489   if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2490     return JVMTI_ERROR_CLASS_NOT_PREPARED;
2491   }
2492 
2493   if (!k->is_instance_klass()) {
2494     *method_count_ptr = 0;
2495     *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2496     return JVMTI_ERROR_NONE;
2497   }
2498   InstanceKlass* ik = InstanceKlass::cast(k);
2499   // Allocate the result and fill it in
2500   int result_length = ik->methods()->length();
2501   jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID));
2502   int index;
2503   bool jmethodids_found = true;
2504 
2505   if (JvmtiExport::can_maintain_original_method_order()) {
2506     // Use the original method ordering indices stored in the class, so we can emit
2507     // jmethodIDs in the order they appeared in the class file
2508     for (index = 0; index < result_length; index++) {
2509       Method* m = ik->methods()->at(index);
2510       int original_index = ik->method_ordering()->at(index);
2511       assert(original_index >= 0 && original_index < result_length, "invalid original method index");
2512       jmethodID id;
2513       if (jmethodids_found) {
2514         id = m->find_jmethod_id_or_null();
2515         if (id == NULL) {
2516           // If we find an uninitialized value, make sure there is
2517           // enough space for all the uninitialized values we might
2518           // find.
2519           ik->ensure_space_for_methodids(index);
2520           jmethodids_found = false;
2521           id = m->jmethod_id();
2522         }
2523       } else {
2524         id = m->jmethod_id();
2525       }
2526       result_list[original_index] = id;
2527     }
2528   } else {
2529     // otherwise just copy in any order
2530     for (index = 0; index < result_length; index++) {
2531       Method* m = ik->methods()->at(index);
2532       jmethodID id;
2533       if (jmethodids_found) {
2534         id = m->find_jmethod_id_or_null();
2535         if (id == NULL) {
2536           // If we find an uninitialized value, make sure there is
2537           // enough space for all the uninitialized values we might
2538           // find.
2539           ik->ensure_space_for_methodids(index);
2540           jmethodids_found = false;
2541           id = m->jmethod_id();
2542         }
2543       } else {
2544         id = m->jmethod_id();
2545       }
2546       result_list[index] = id;
2547     }
2548   }
2549   // Fill in return value.
2550   *method_count_ptr = result_length;
2551   *methods_ptr = result_list;
2552 
2553   return JVMTI_ERROR_NONE;
2554 } /* end GetClassMethods */
2555 
2556 
2557 // k_mirror - may be primitive, this must be checked
2558 // field_count_ptr - pre-checked for NULL
2559 // fields_ptr - pre-checked for NULL
2560 jvmtiError
2561 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) {
2562   if (java_lang_Class::is_primitive(k_mirror)) {
2563     *field_count_ptr = 0;
2564     *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2565     return JVMTI_ERROR_NONE;
2566   }
2567   JavaThread* current_thread = JavaThread::current();
2568   HandleMark hm(current_thread);
2569   Klass* k = java_lang_Class::as_Klass(k_mirror);
2570   NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2571 
2572   // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2573   if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2574     return JVMTI_ERROR_CLASS_NOT_PREPARED;
2575   }
2576 
2577   if (!k->is_instance_klass()) {
2578     *field_count_ptr = 0;
2579     *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2580     return JVMTI_ERROR_NONE;
2581   }
2582 
2583 
2584   InstanceKlass* ik = InstanceKlass::cast(k);
2585 
2586   int result_count = 0;
2587   // First, count the fields.
2588   FilteredFieldStream flds(ik, true, true);
2589   result_count = flds.field_count();
2590 
2591   // Allocate the result and fill it in
2592   jfieldID* result_list = (jfieldID*) jvmtiMalloc(result_count * sizeof(jfieldID));
2593   // The JVMTI spec requires fields in the order they occur in the class file,
2594   // this is the reverse order of what FieldStream hands out.
2595   int id_index = (result_count - 1);
2596 
2597   for (FilteredFieldStream src_st(ik, true, true); !src_st.eos(); src_st.next()) {
2598     result_list[id_index--] = jfieldIDWorkaround::to_jfieldID(
2599                                             ik, src_st.offset(),
2600                                             src_st.access_flags().is_static());
2601   }
2602   assert(id_index == -1, "just checking");
2603   // Fill in the results
2604   *field_count_ptr = result_count;
2605   *fields_ptr = result_list;
2606 
2607   return JVMTI_ERROR_NONE;
2608 } /* end GetClassFields */
2609 
2610 
2611 // k_mirror - may be primitive, this must be checked
2612 // interface_count_ptr - pre-checked for NULL
2613 // interfaces_ptr - pre-checked for NULL
2614 jvmtiError
2615 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
2616   {
2617     if (java_lang_Class::is_primitive(k_mirror)) {
2618       *interface_count_ptr = 0;
2619       *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2620       return JVMTI_ERROR_NONE;
2621     }
2622     JavaThread* current_thread = JavaThread::current();
2623     HandleMark hm(current_thread);
2624     Klass* k = java_lang_Class::as_Klass(k_mirror);
2625     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2626 
2627     // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2628     if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) ))
2629       return JVMTI_ERROR_CLASS_NOT_PREPARED;
2630 
2631     if (!k->is_instance_klass()) {
2632       *interface_count_ptr = 0;
2633       *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2634       return JVMTI_ERROR_NONE;
2635     }
2636 
2637     Array<InstanceKlass*>* interface_list = InstanceKlass::cast(k)->local_interfaces();
2638     const int result_length = (interface_list == NULL ? 0 : interface_list->length());
2639     jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass));
2640     for (int i_index = 0; i_index < result_length; i_index += 1) {
2641       InstanceKlass* klass_at = interface_list->at(i_index);
2642       assert(klass_at->is_klass(), "interfaces must be Klass*s");
2643       assert(klass_at->is_interface(), "interfaces must be interfaces");
2644       oop mirror_at = klass_at->java_mirror();
2645       Handle handle_at = Handle(current_thread, mirror_at);
2646       result_list[i_index] = (jclass) jni_reference(handle_at);
2647     }
2648     *interface_count_ptr = result_length;
2649     *interfaces_ptr = result_list;
2650   }
2651 
2652   return JVMTI_ERROR_NONE;
2653 } /* end GetImplementedInterfaces */
2654 
2655 
2656 // k_mirror - may be primitive, this must be checked
2657 // minor_version_ptr - pre-checked for NULL
2658 // major_version_ptr - pre-checked for NULL
2659 jvmtiError
2660 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) {
2661   if (java_lang_Class::is_primitive(k_mirror)) {
2662     return JVMTI_ERROR_ABSENT_INFORMATION;
2663   }
2664   Klass* klass = java_lang_Class::as_Klass(k_mirror);
2665 
2666   jint status = klass->jvmti_class_status();
2667   if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2668     return JVMTI_ERROR_INVALID_CLASS;
2669   }
2670   if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2671     return JVMTI_ERROR_ABSENT_INFORMATION;
2672   }
2673 
2674   InstanceKlass* ik = InstanceKlass::cast(klass);
2675   *minor_version_ptr = ik->minor_version();
2676   *major_version_ptr = ik->major_version();
2677 
2678   return JVMTI_ERROR_NONE;
2679 } /* end GetClassVersionNumbers */
2680 
2681 
2682 // k_mirror - may be primitive, this must be checked
2683 // constant_pool_count_ptr - pre-checked for NULL
2684 // constant_pool_byte_count_ptr - pre-checked for NULL
2685 // constant_pool_bytes_ptr - pre-checked for NULL
2686 jvmtiError
2687 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) {
2688   if (java_lang_Class::is_primitive(k_mirror)) {
2689     return JVMTI_ERROR_ABSENT_INFORMATION;
2690   }
2691 
2692   Klass* klass = java_lang_Class::as_Klass(k_mirror);
2693   Thread *thread = Thread::current();
2694   ResourceMark rm(thread);
2695 
2696   jint status = klass->jvmti_class_status();
2697   if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2698     return JVMTI_ERROR_INVALID_CLASS;
2699   }
2700   if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2701     return JVMTI_ERROR_ABSENT_INFORMATION;
2702   }
2703 
2704   InstanceKlass* ik = InstanceKlass::cast(klass);
2705   JvmtiConstantPoolReconstituter reconstituter(ik);
2706   if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2707     return reconstituter.get_error();
2708   }
2709 
2710   unsigned char *cpool_bytes;
2711   int cpool_size = reconstituter.cpool_size();
2712   if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2713     return reconstituter.get_error();
2714   }
2715   jvmtiError res = allocate(cpool_size, &cpool_bytes);
2716   if (res != JVMTI_ERROR_NONE) {
2717     return res;
2718   }
2719   reconstituter.copy_cpool_bytes(cpool_bytes);
2720   if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2721     return reconstituter.get_error();
2722   }
2723 
2724   constantPoolHandle  constants(thread, ik->constants());
2725   *constant_pool_count_ptr      = constants->length();
2726   *constant_pool_byte_count_ptr = cpool_size;
2727   *constant_pool_bytes_ptr      = cpool_bytes;
2728 
2729   return JVMTI_ERROR_NONE;
2730 } /* end GetConstantPool */
2731 
2732 
2733 // k_mirror - may be primitive, this must be checked
2734 // is_interface_ptr - pre-checked for NULL
2735 jvmtiError
2736 JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) {
2737   {
2738     bool result = false;
2739     if (!java_lang_Class::is_primitive(k_mirror)) {
2740       Klass* k = java_lang_Class::as_Klass(k_mirror);
2741       if (k != NULL && k->is_interface()) {
2742         result = true;
2743       }
2744     }
2745     *is_interface_ptr = result;
2746   }
2747 
2748   return JVMTI_ERROR_NONE;
2749 } /* end IsInterface */
2750 
2751 
2752 // k_mirror - may be primitive, this must be checked
2753 // is_array_class_ptr - pre-checked for NULL
2754 jvmtiError
2755 JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) {
2756   {
2757     bool result = false;
2758     if (!java_lang_Class::is_primitive(k_mirror)) {
2759       Klass* k = java_lang_Class::as_Klass(k_mirror);
2760       if (k != NULL && k->is_array_klass()) {
2761         result = true;
2762       }
2763     }
2764     *is_array_class_ptr = result;
2765   }
2766 
2767   return JVMTI_ERROR_NONE;
2768 } /* end IsArrayClass */
2769 
2770 
2771 // k_mirror - may be primitive, this must be checked
2772 // classloader_ptr - pre-checked for NULL
2773 jvmtiError
2774 JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) {
2775   {
2776     if (java_lang_Class::is_primitive(k_mirror)) {
2777       *classloader_ptr = (jclass) jni_reference(Handle());
2778       return JVMTI_ERROR_NONE;
2779     }
2780     JavaThread* current_thread = JavaThread::current();
2781     HandleMark hm(current_thread);
2782     Klass* k = java_lang_Class::as_Klass(k_mirror);
2783     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2784 
2785     oop result_oop = k->class_loader();
2786     if (result_oop == NULL) {
2787       *classloader_ptr = (jclass) jni_reference(Handle());
2788       return JVMTI_ERROR_NONE;
2789     }
2790     Handle result_handle = Handle(current_thread, result_oop);
2791     jclass result_jnihandle = (jclass) jni_reference(result_handle);
2792     *classloader_ptr = result_jnihandle;
2793   }
2794   return JVMTI_ERROR_NONE;
2795 } /* end GetClassLoader */
2796 
2797 
2798 // k_mirror - may be primitive, this must be checked
2799 // source_debug_extension_ptr - pre-checked for NULL
2800 jvmtiError
2801 JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) {
2802   {
2803     if (java_lang_Class::is_primitive(k_mirror)) {
2804       return JVMTI_ERROR_ABSENT_INFORMATION;
2805     }
2806     Klass* k = java_lang_Class::as_Klass(k_mirror);
2807     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2808     if (!k->is_instance_klass()) {
2809       return JVMTI_ERROR_ABSENT_INFORMATION;
2810     }
2811     const char* sde = InstanceKlass::cast(k)->source_debug_extension();
2812     NULL_CHECK(sde, JVMTI_ERROR_ABSENT_INFORMATION);
2813 
2814     {
2815       *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sde)+1);
2816       strcpy(*source_debug_extension_ptr, sde);
2817     }
2818   }
2819 
2820   return JVMTI_ERROR_NONE;
2821 } /* end GetSourceDebugExtension */
2822 
2823   //
2824   // Object functions
2825   //
2826 
2827 // hash_code_ptr - pre-checked for NULL
2828 jvmtiError
2829 JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) {
2830   oop mirror = JNIHandles::resolve_external_guard(object);
2831   NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
2832   NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER);
2833 
2834   {
2835     jint result = (jint) mirror->identity_hash();
2836     *hash_code_ptr = result;
2837   }
2838   return JVMTI_ERROR_NONE;
2839 } /* end GetObjectHashCode */
2840 
2841 
2842 // info_ptr - pre-checked for NULL
2843 jvmtiError
2844 JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) {
2845   JavaThread* calling_thread = JavaThread::current();
2846   jvmtiError err = get_object_monitor_usage(calling_thread, object, info_ptr);
2847   if (err == JVMTI_ERROR_THREAD_NOT_SUSPENDED) {
2848     // Some of the critical threads were not suspended. go to a safepoint and try again
2849     VM_GetObjectMonitorUsage op(this, calling_thread, object, info_ptr);
2850     VMThread::execute(&op);
2851     err = op.result();
2852   }
2853   return err;
2854 } /* end GetObjectMonitorUsage */
2855 
2856 
2857   //
2858   // Field functions
2859   //
2860 
2861 // name_ptr - NULL is a valid value, must be checked
2862 // signature_ptr - NULL is a valid value, must be checked
2863 // generic_ptr - NULL is a valid value, must be checked
2864 jvmtiError
2865 JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) {
2866   JavaThread* current_thread  = JavaThread::current();
2867   ResourceMark rm(current_thread);
2868   if (name_ptr == NULL) {
2869     // just don't return the name
2870   } else {
2871     const char* fieldName = fdesc_ptr->name()->as_C_string();
2872     *name_ptr =  (char*) jvmtiMalloc(strlen(fieldName) + 1);
2873     if (*name_ptr == NULL)
2874       return JVMTI_ERROR_OUT_OF_MEMORY;
2875     strcpy(*name_ptr, fieldName);
2876   }
2877   if (signature_ptr== NULL) {
2878     // just don't return the signature
2879   } else {
2880     const char* fieldSignature = fdesc_ptr->signature()->as_C_string();
2881     *signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1);
2882     if (*signature_ptr == NULL)
2883       return JVMTI_ERROR_OUT_OF_MEMORY;
2884     strcpy(*signature_ptr, fieldSignature);
2885   }
2886   if (generic_ptr != NULL) {
2887     *generic_ptr = NULL;
2888     Symbol* soop = fdesc_ptr->generic_signature();
2889     if (soop != NULL) {
2890       const char* gen_sig = soop->as_C_string();
2891       if (gen_sig != NULL) {
2892         jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
2893         if (err != JVMTI_ERROR_NONE) {
2894           return err;
2895         }
2896         strcpy(*generic_ptr, gen_sig);
2897       }
2898     }
2899   }
2900   return JVMTI_ERROR_NONE;
2901 } /* end GetFieldName */
2902 
2903 
2904 // declaring_class_ptr - pre-checked for NULL
2905 jvmtiError
2906 JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) {
2907 
2908   *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder());
2909   return JVMTI_ERROR_NONE;
2910 } /* end GetFieldDeclaringClass */
2911 
2912 
2913 // modifiers_ptr - pre-checked for NULL
2914 jvmtiError
2915 JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) {
2916 
2917   AccessFlags resultFlags = fdesc_ptr->access_flags();
2918   jint result = resultFlags.as_int();
2919   *modifiers_ptr = result;
2920 
2921   return JVMTI_ERROR_NONE;
2922 } /* end GetFieldModifiers */
2923 
2924 
2925 // is_synthetic_ptr - pre-checked for NULL
2926 jvmtiError
2927 JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) {
2928   *is_synthetic_ptr = fdesc_ptr->is_synthetic();
2929   return JVMTI_ERROR_NONE;
2930 } /* end IsFieldSynthetic */
2931 
2932 
2933   //
2934   // Method functions
2935   //
2936 
2937 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2938 // name_ptr - NULL is a valid value, must be checked
2939 // signature_ptr - NULL is a valid value, must be checked
2940 // generic_ptr - NULL is a valid value, must be checked
2941 jvmtiError
2942 JvmtiEnv::GetMethodName(Method* method_oop, char** name_ptr, char** signature_ptr, char** generic_ptr) {
2943   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2944   JavaThread* current_thread  = JavaThread::current();
2945 
2946   ResourceMark rm(current_thread); // get the utf8 name and signature
2947   if (name_ptr == NULL) {
2948     // just don't return the name
2949   } else {
2950     const char* utf8_name = (const char *) method_oop->name()->as_utf8();
2951     *name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1);
2952     strcpy(*name_ptr, utf8_name);
2953   }
2954   if (signature_ptr == NULL) {
2955     // just don't return the signature
2956   } else {
2957     const char* utf8_signature = (const char *) method_oop->signature()->as_utf8();
2958     *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1);
2959     strcpy(*signature_ptr, utf8_signature);
2960   }
2961 
2962   if (generic_ptr != NULL) {
2963     *generic_ptr = NULL;
2964     Symbol* soop = method_oop->generic_signature();
2965     if (soop != NULL) {
2966       const char* gen_sig = soop->as_C_string();
2967       if (gen_sig != NULL) {
2968         jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
2969         if (err != JVMTI_ERROR_NONE) {
2970           return err;
2971         }
2972         strcpy(*generic_ptr, gen_sig);
2973       }
2974     }
2975   }
2976   return JVMTI_ERROR_NONE;
2977 } /* end GetMethodName */
2978 
2979 
2980 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2981 // declaring_class_ptr - pre-checked for NULL
2982 jvmtiError
2983 JvmtiEnv::GetMethodDeclaringClass(Method* method_oop, jclass* declaring_class_ptr) {
2984   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2985   (*declaring_class_ptr) = get_jni_class_non_null(method_oop->method_holder());
2986   return JVMTI_ERROR_NONE;
2987 } /* end GetMethodDeclaringClass */
2988 
2989 
2990 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2991 // modifiers_ptr - pre-checked for NULL
2992 jvmtiError
2993 JvmtiEnv::GetMethodModifiers(Method* method_oop, jint* modifiers_ptr) {
2994   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2995   (*modifiers_ptr) = method_oop->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2996   return JVMTI_ERROR_NONE;
2997 } /* end GetMethodModifiers */
2998 
2999 
3000 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3001 // max_ptr - pre-checked for NULL
3002 jvmtiError
3003 JvmtiEnv::GetMaxLocals(Method* method_oop, jint* max_ptr) {
3004   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3005   // get max stack
3006   (*max_ptr) = method_oop->max_locals();
3007   return JVMTI_ERROR_NONE;
3008 } /* end GetMaxLocals */
3009 
3010 
3011 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3012 // size_ptr - pre-checked for NULL
3013 jvmtiError
3014 JvmtiEnv::GetArgumentsSize(Method* method_oop, jint* size_ptr) {
3015   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3016   // get size of arguments
3017 
3018   (*size_ptr) = method_oop->size_of_parameters();
3019   return JVMTI_ERROR_NONE;
3020 } /* end GetArgumentsSize */
3021 
3022 
3023 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3024 // entry_count_ptr - pre-checked for NULL
3025 // table_ptr - pre-checked for NULL
3026 jvmtiError
3027 JvmtiEnv::GetLineNumberTable(Method* method_oop, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) {
3028   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3029   if (!method_oop->has_linenumber_table()) {
3030     return (JVMTI_ERROR_ABSENT_INFORMATION);
3031   }
3032 
3033   // The line number table is compressed so we don't know how big it is until decompressed.
3034   // Decompression is really fast so we just do it twice.
3035 
3036   // Compute size of table
3037   jint num_entries = 0;
3038   CompressedLineNumberReadStream stream(method_oop->compressed_linenumber_table());
3039   while (stream.read_pair()) {
3040     num_entries++;
3041   }
3042   jvmtiLineNumberEntry *jvmti_table =
3043             (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry)));
3044 
3045   // Fill jvmti table
3046   if (num_entries > 0) {
3047     int index = 0;
3048     CompressedLineNumberReadStream stream(method_oop->compressed_linenumber_table());
3049     while (stream.read_pair()) {
3050       jvmti_table[index].start_location = (jlocation) stream.bci();
3051       jvmti_table[index].line_number = (jint) stream.line();
3052       index++;
3053     }
3054     assert(index == num_entries, "sanity check");
3055   }
3056 
3057   // Set up results
3058   (*entry_count_ptr) = num_entries;
3059   (*table_ptr) = jvmti_table;
3060 
3061   return JVMTI_ERROR_NONE;
3062 } /* end GetLineNumberTable */
3063 
3064 
3065 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3066 // start_location_ptr - pre-checked for NULL
3067 // end_location_ptr - pre-checked for NULL
3068 jvmtiError
3069 JvmtiEnv::GetMethodLocation(Method* method_oop, jlocation* start_location_ptr, jlocation* end_location_ptr) {
3070 
3071   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3072   // get start and end location
3073   (*end_location_ptr) = (jlocation) (method_oop->code_size() - 1);
3074   if (method_oop->code_size() == 0) {
3075     // there is no code so there is no start location
3076     (*start_location_ptr) = (jlocation)(-1);
3077   } else {
3078     (*start_location_ptr) = (jlocation)(0);
3079   }
3080 
3081   return JVMTI_ERROR_NONE;
3082 } /* end GetMethodLocation */
3083 
3084 
3085 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3086 // entry_count_ptr - pre-checked for NULL
3087 // table_ptr - pre-checked for NULL
3088 jvmtiError
3089 JvmtiEnv::GetLocalVariableTable(Method* method_oop, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) {
3090 
3091   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3092   JavaThread* current_thread  = JavaThread::current();
3093 
3094   // does the klass have any local variable information?
3095   InstanceKlass* ik = method_oop->method_holder();
3096   if (!ik->access_flags().has_localvariable_table()) {
3097     return (JVMTI_ERROR_ABSENT_INFORMATION);
3098   }
3099 
3100   ConstantPool* constants = method_oop->constants();
3101   NULL_CHECK(constants, JVMTI_ERROR_ABSENT_INFORMATION);
3102 
3103   // in the vm localvariable table representation, 6 consecutive elements in the table
3104   // represent a 6-tuple of shorts
3105   // [start_pc, length, name_index, descriptor_index, signature_index, index]
3106   jint num_entries = method_oop->localvariable_table_length();
3107   jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *)
3108                 jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry)));
3109 
3110   if (num_entries > 0) {
3111     LocalVariableTableElement* table = method_oop->localvariable_table_start();
3112     for (int i = 0; i < num_entries; i++) {
3113       // get the 5 tuple information from the vm table
3114       jlocation start_location = (jlocation) table[i].start_bci;
3115       jint length = (jint) table[i].length;
3116       int name_index = (int) table[i].name_cp_index;
3117       int signature_index = (int) table[i].descriptor_cp_index;
3118       int generic_signature_index = (int) table[i].signature_cp_index;
3119       jint slot = (jint) table[i].slot;
3120 
3121       // get utf8 name and signature
3122       char *name_buf = NULL;
3123       char *sig_buf = NULL;
3124       char *gen_sig_buf = NULL;
3125       {
3126         ResourceMark rm(current_thread);
3127 
3128         const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8();
3129         name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3130         strcpy(name_buf, utf8_name);
3131 
3132         const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8();
3133         sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1);
3134         strcpy(sig_buf, utf8_signature);
3135 
3136         if (generic_signature_index > 0) {
3137           const char *utf8_gen_sign = (const char *)
3138                                        constants->symbol_at(generic_signature_index)->as_utf8();
3139           gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1);
3140           strcpy(gen_sig_buf, utf8_gen_sign);
3141         }
3142       }
3143 
3144       // fill in the jvmti local variable table
3145       jvmti_table[i].start_location = start_location;
3146       jvmti_table[i].length = length;
3147       jvmti_table[i].name = name_buf;
3148       jvmti_table[i].signature = sig_buf;
3149       jvmti_table[i].generic_signature = gen_sig_buf;
3150       jvmti_table[i].slot = slot;
3151     }
3152   }
3153 
3154   // set results
3155   (*entry_count_ptr) = num_entries;
3156   (*table_ptr) = jvmti_table;
3157 
3158   return JVMTI_ERROR_NONE;
3159 } /* end GetLocalVariableTable */
3160 
3161 
3162 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3163 // bytecode_count_ptr - pre-checked for NULL
3164 // bytecodes_ptr - pre-checked for NULL
3165 jvmtiError
3166 JvmtiEnv::GetBytecodes(Method* method_oop, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) {
3167   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3168 
3169   HandleMark hm;
3170   methodHandle method(Thread::current(), method_oop);
3171   jint size = (jint)method->code_size();
3172   jvmtiError err = allocate(size, bytecodes_ptr);
3173   if (err != JVMTI_ERROR_NONE) {
3174     return err;
3175   }
3176 
3177   (*bytecode_count_ptr) = size;
3178   // get byte codes
3179   JvmtiClassFileReconstituter::copy_bytecodes(method, *bytecodes_ptr);
3180 
3181   return JVMTI_ERROR_NONE;
3182 } /* end GetBytecodes */
3183 
3184 
3185 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3186 // is_native_ptr - pre-checked for NULL
3187 jvmtiError
3188 JvmtiEnv::IsMethodNative(Method* method_oop, jboolean* is_native_ptr) {
3189   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3190   (*is_native_ptr) = method_oop->is_native();
3191   return JVMTI_ERROR_NONE;
3192 } /* end IsMethodNative */
3193 
3194 
3195 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3196 // is_synthetic_ptr - pre-checked for NULL
3197 jvmtiError
3198 JvmtiEnv::IsMethodSynthetic(Method* method_oop, jboolean* is_synthetic_ptr) {
3199   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3200   (*is_synthetic_ptr) = method_oop->is_synthetic();
3201   return JVMTI_ERROR_NONE;
3202 } /* end IsMethodSynthetic */
3203 
3204 
3205 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3206 // is_obsolete_ptr - pre-checked for NULL
3207 jvmtiError
3208 JvmtiEnv::IsMethodObsolete(Method* method_oop, jboolean* is_obsolete_ptr) {
3209   if (use_version_1_0_semantics() &&
3210       get_capabilities()->can_redefine_classes == 0) {
3211     // This JvmtiEnv requested version 1.0 semantics and this function
3212     // requires the can_redefine_classes capability in version 1.0 so
3213     // we need to return an error here.
3214     return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3215   }
3216 
3217   if (method_oop == NULL || method_oop->is_obsolete()) {
3218     *is_obsolete_ptr = true;
3219   } else {
3220     *is_obsolete_ptr = false;
3221   }
3222   return JVMTI_ERROR_NONE;
3223 } /* end IsMethodObsolete */
3224 
3225   //
3226   // Raw Monitor functions
3227   //
3228 
3229 // name - pre-checked for NULL
3230 // monitor_ptr - pre-checked for NULL
3231 jvmtiError
3232 JvmtiEnv::CreateRawMonitor(const char* name, jrawMonitorID* monitor_ptr) {
3233   JvmtiRawMonitor* rmonitor = new JvmtiRawMonitor(name);
3234   NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY);
3235 
3236   *monitor_ptr = (jrawMonitorID)rmonitor;
3237 
3238   return JVMTI_ERROR_NONE;
3239 } /* end CreateRawMonitor */
3240 
3241 
3242 // rmonitor - pre-checked for validity
3243 jvmtiError
3244 JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) {
3245   if (Threads::number_of_threads() == 0) {
3246     // Remove this monitor from pending raw monitors list
3247     // if it has entered in onload or start phase.
3248     JvmtiPendingMonitors::destroy(rmonitor);
3249   } else {
3250     Thread* thread  = Thread::current();
3251     if (rmonitor->owner() == thread) {
3252       // The caller owns this monitor which we are about to destroy.
3253       // We exit the underlying synchronization object so that the
3254       // "delete monitor" call below can work without an assertion
3255       // failure on systems that don't like destroying synchronization
3256       // objects that are locked.
3257       int r;
3258       int recursion = rmonitor->recursions();
3259       for (int i = 0; i <= recursion; i++) {
3260         r = rmonitor->raw_exit(thread);
3261         assert(r == JvmtiRawMonitor::M_OK, "raw_exit should have worked");
3262         if (r != JvmtiRawMonitor::M_OK) {  // robustness
3263           return JVMTI_ERROR_INTERNAL;
3264         }
3265       }
3266     }
3267     if (rmonitor->owner() != NULL) {
3268       // The caller is trying to destroy a monitor that is locked by
3269       // someone else. While this is not forbidden by the JVMTI
3270       // spec, it will cause an assertion failure on systems that don't
3271       // like destroying synchronization objects that are locked.
3272       // We indicate a problem with the error return (and leak the
3273       // monitor's memory).
3274       return JVMTI_ERROR_NOT_MONITOR_OWNER;
3275     }
3276   }
3277 
3278   delete rmonitor;
3279 
3280   return JVMTI_ERROR_NONE;
3281 } /* end DestroyRawMonitor */
3282 
3283 
3284 // rmonitor - pre-checked for validity
3285 jvmtiError
3286 JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) {
3287   if (Threads::number_of_threads() == 0) {
3288     // No JavaThreads exist so JvmtiRawMonitor enter cannot be
3289     // used, add this raw monitor to the pending list.
3290     // The pending monitors will be actually entered when
3291     // the VM is setup.
3292     // See transition_pending_raw_monitors in create_vm()
3293     // in thread.cpp.
3294     JvmtiPendingMonitors::enter(rmonitor);
3295   } else {
3296     Thread* thread = Thread::current();
3297     if (thread->is_Java_thread()) {
3298       JavaThread* current_thread = (JavaThread*)thread;
3299 
3300       /* Transition to thread_blocked without entering vm state          */
3301       /* This is really evil. Normally you can't undo _thread_blocked    */
3302       /* transitions like this because it would cause us to miss a       */
3303       /* safepoint but since the thread was already in _thread_in_native */
3304       /* the thread is not leaving a safepoint safe state and it will    */
3305       /* block when it tries to return from native. We can't safepoint   */
3306       /* block in here because we could deadlock the vmthread. Blech.    */
3307 
3308       JavaThreadState state = current_thread->thread_state();
3309       assert(state == _thread_in_native, "Must be _thread_in_native");
3310       // frame should already be walkable since we are in native
3311       assert(!current_thread->has_last_Java_frame() ||
3312              current_thread->frame_anchor()->walkable(), "Must be walkable");
3313       current_thread->set_thread_state(_thread_blocked);
3314 
3315       rmonitor->raw_enter(current_thread);
3316       // restore state, still at a safepoint safe state
3317       current_thread->set_thread_state(state);
3318     } else {
3319       rmonitor->raw_enter(thread);
3320     }
3321   }
3322   return JVMTI_ERROR_NONE;
3323 } /* end RawMonitorEnter */
3324 
3325 
3326 // rmonitor - pre-checked for validity
3327 jvmtiError
3328 JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) {
3329   jvmtiError err = JVMTI_ERROR_NONE;
3330 
3331   if (Threads::number_of_threads() == 0) {
3332     // No JavaThreads exist so just remove this monitor from the pending list.
3333     // Bool value from exit is false if rmonitor is not in the list.
3334     if (!JvmtiPendingMonitors::exit(rmonitor)) {
3335       err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3336     }
3337   } else {
3338     Thread* thread = Thread::current();
3339     int r = rmonitor->raw_exit(thread);
3340     if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3341       err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3342     }
3343   }
3344   return err;
3345 } /* end RawMonitorExit */
3346 
3347 
3348 // rmonitor - pre-checked for validity
3349 jvmtiError
3350 JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) {
3351   Thread* thread = Thread::current();
3352   int r = rmonitor->raw_wait(millis, thread);
3353 
3354   switch (r) {
3355   case JvmtiRawMonitor::M_INTERRUPTED:
3356     return JVMTI_ERROR_INTERRUPT;
3357   case JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE:
3358     return JVMTI_ERROR_NOT_MONITOR_OWNER;
3359   default:
3360     return JVMTI_ERROR_NONE;
3361   }
3362 } /* end RawMonitorWait */
3363 
3364 
3365 // rmonitor - pre-checked for validity
3366 jvmtiError
3367 JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) {
3368   Thread* thread = Thread::current();
3369   int r = rmonitor->raw_notify(thread);
3370 
3371   if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3372     return JVMTI_ERROR_NOT_MONITOR_OWNER;
3373   }
3374   return JVMTI_ERROR_NONE;
3375 } /* end RawMonitorNotify */
3376 
3377 
3378 // rmonitor - pre-checked for validity
3379 jvmtiError
3380 JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) {
3381   Thread* thread = Thread::current();
3382   int r = rmonitor->raw_notifyAll(thread);
3383 
3384   if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3385     return JVMTI_ERROR_NOT_MONITOR_OWNER;
3386   }
3387   return JVMTI_ERROR_NONE;
3388 } /* end RawMonitorNotifyAll */
3389 
3390 
3391   //
3392   // JNI Function Interception functions
3393   //
3394 
3395 
3396 // function_table - pre-checked for NULL
3397 jvmtiError
3398 JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) {
3399   // Copy jni function table at safepoint.
3400   VM_JNIFunctionTableCopier copier(function_table);
3401   VMThread::execute(&copier);
3402 
3403   return JVMTI_ERROR_NONE;
3404 } /* end SetJNIFunctionTable */
3405 
3406 
3407 // function_table - pre-checked for NULL
3408 jvmtiError
3409 JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) {
3410   *function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface));
3411   if (*function_table == NULL)
3412     return JVMTI_ERROR_OUT_OF_MEMORY;
3413   memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface));
3414   return JVMTI_ERROR_NONE;
3415 } /* end GetJNIFunctionTable */
3416 
3417 
3418   //
3419   // Event Management functions
3420   //
3421 
3422 jvmtiError
3423 JvmtiEnv::GenerateEvents(jvmtiEvent event_type) {
3424   // can only generate two event types
3425   if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD &&
3426       event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) {
3427     return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3428   }
3429 
3430   // for compiled_method_load events we must check that the environment
3431   // has the can_generate_compiled_method_load_events capability.
3432   if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) {
3433     if (get_capabilities()->can_generate_compiled_method_load_events == 0) {
3434       return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3435     }
3436     return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this);
3437   } else {
3438     return JvmtiCodeBlobEvents::generate_dynamic_code_events(this);
3439   }
3440 
3441 } /* end GenerateEvents */
3442 
3443 
3444   //
3445   // Extension Mechanism functions
3446   //
3447 
3448 // extension_count_ptr - pre-checked for NULL
3449 // extensions - pre-checked for NULL
3450 jvmtiError
3451 JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) {
3452   return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions);
3453 } /* end GetExtensionFunctions */
3454 
3455 
3456 // extension_count_ptr - pre-checked for NULL
3457 // extensions - pre-checked for NULL
3458 jvmtiError
3459 JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) {
3460   return JvmtiExtensions::get_events(this, extension_count_ptr, extensions);
3461 } /* end GetExtensionEvents */
3462 
3463 
3464 // callback - NULL is a valid value, must be checked
3465 jvmtiError
3466 JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) {
3467   return JvmtiExtensions::set_event_callback(this, extension_event_index, callback);
3468 } /* end SetExtensionEventCallback */
3469 
3470   //
3471   // Timers functions
3472   //
3473 
3474 // info_ptr - pre-checked for NULL
3475 jvmtiError
3476 JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3477   os::current_thread_cpu_time_info(info_ptr);
3478   return JVMTI_ERROR_NONE;
3479 } /* end GetCurrentThreadCpuTimerInfo */
3480 
3481 
3482 // nanos_ptr - pre-checked for NULL
3483 jvmtiError
3484 JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) {
3485   *nanos_ptr = os::current_thread_cpu_time();
3486   return JVMTI_ERROR_NONE;
3487 } /* end GetCurrentThreadCpuTime */
3488 
3489 
3490 // info_ptr - pre-checked for NULL
3491 jvmtiError
3492 JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3493   os::thread_cpu_time_info(info_ptr);
3494   return JVMTI_ERROR_NONE;
3495 } /* end GetThreadCpuTimerInfo */
3496 
3497 
3498 // Threads_lock NOT held, java_thread not protected by lock
3499 // java_thread - pre-checked
3500 // nanos_ptr - pre-checked for NULL
3501 jvmtiError
3502 JvmtiEnv::GetThreadCpuTime(JavaThread* java_thread, jlong* nanos_ptr) {
3503   *nanos_ptr = os::thread_cpu_time(java_thread);
3504   return JVMTI_ERROR_NONE;
3505 } /* end GetThreadCpuTime */
3506 
3507 
3508 // info_ptr - pre-checked for NULL
3509 jvmtiError
3510 JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) {
3511   os::javaTimeNanos_info(info_ptr);
3512   return JVMTI_ERROR_NONE;
3513 } /* end GetTimerInfo */
3514 
3515 
3516 // nanos_ptr - pre-checked for NULL
3517 jvmtiError
3518 JvmtiEnv::GetTime(jlong* nanos_ptr) {
3519   *nanos_ptr = os::javaTimeNanos();
3520   return JVMTI_ERROR_NONE;
3521 } /* end GetTime */
3522 
3523 
3524 // processor_count_ptr - pre-checked for NULL
3525 jvmtiError
3526 JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) {
3527   *processor_count_ptr = os::active_processor_count();
3528   return JVMTI_ERROR_NONE;
3529 } /* end GetAvailableProcessors */
3530 
3531 jvmtiError
3532 JvmtiEnv::SetHeapSamplingInterval(jint sampling_interval) {
3533   if (sampling_interval < 0) {
3534     return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3535   }
3536   ThreadHeapSampler::set_sampling_interval(sampling_interval);
3537   return JVMTI_ERROR_NONE;
3538 } /* end SetHeapSamplingInterval */
3539 
3540   //
3541   // System Properties functions
3542   //
3543 
3544 // count_ptr - pre-checked for NULL
3545 // property_ptr - pre-checked for NULL
3546 jvmtiError
3547 JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) {
3548   jvmtiError err = JVMTI_ERROR_NONE;
3549 
3550   // Get the number of readable properties.
3551   *count_ptr = Arguments::PropertyList_readable_count(Arguments::system_properties());
3552 
3553   // Allocate memory to hold the exact number of readable properties.
3554   err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr);
3555   if (err != JVMTI_ERROR_NONE) {
3556     return err;
3557   }
3558   int readable_count = 0;
3559   // Loop through the system properties until all the readable properties are found.
3560   for (SystemProperty* p = Arguments::system_properties(); p != NULL && readable_count < *count_ptr; p = p->next()) {
3561     if (p->is_readable()) {
3562       const char *key = p->key();
3563       char **tmp_value = *property_ptr+readable_count;
3564       readable_count++;
3565       err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value);
3566       if (err == JVMTI_ERROR_NONE) {
3567         strcpy(*tmp_value, key);
3568       } else {
3569         // clean up previously allocated memory.
3570         for (int j = 0; j < readable_count; j++) {
3571           Deallocate((unsigned char*)*property_ptr+j);
3572         }
3573         Deallocate((unsigned char*)property_ptr);
3574         break;
3575       }
3576     }
3577   }
3578   assert(err != JVMTI_ERROR_NONE || readable_count == *count_ptr, "Bad readable property count");
3579   return err;
3580 } /* end GetSystemProperties */
3581 
3582 
3583 // property - pre-checked for NULL
3584 // value_ptr - pre-checked for NULL
3585 jvmtiError
3586 JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) {
3587   jvmtiError err = JVMTI_ERROR_NONE;
3588   const char *value;
3589 
3590   // Return JVMTI_ERROR_NOT_AVAILABLE if property is not readable or doesn't exist.
3591   value = Arguments::PropertyList_get_readable_value(Arguments::system_properties(), property);
3592   if (value == NULL) {
3593     err =  JVMTI_ERROR_NOT_AVAILABLE;
3594   } else {
3595     err = allocate((strlen(value)+1) * sizeof(char), (unsigned char **)value_ptr);
3596     if (err == JVMTI_ERROR_NONE) {
3597       strcpy(*value_ptr, value);
3598     }
3599   }
3600   return err;
3601 } /* end GetSystemProperty */
3602 
3603 
3604 // property - pre-checked for NULL
3605 // value - NULL is a valid value, must be checked
3606 jvmtiError
3607 JvmtiEnv::SetSystemProperty(const char* property, const char* value_ptr) {
3608   jvmtiError err =JVMTI_ERROR_NOT_AVAILABLE;
3609 
3610   for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
3611     if (strcmp(property, p->key()) == 0) {
3612       if (p->set_writeable_value(value_ptr)) {
3613         err =  JVMTI_ERROR_NONE;
3614       }
3615     }
3616   }
3617   return err;
3618 } /* end SetSystemProperty */