runtime.h revision ccdd4a5be1db2588767ed230b7064e5fe802ce8d
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef ART_RUNTIME_RUNTIME_H_ 18#define ART_RUNTIME_RUNTIME_H_ 19 20#include <jni.h> 21#include <stdio.h> 22 23#include <iosfwd> 24#include <set> 25#include <string> 26#include <utility> 27#include <vector> 28 29#include "compiler_callbacks.h" 30#include "gc_root.h" 31#include "instrumentation.h" 32#include "instruction_set.h" 33#include "jobject_comparator.h" 34#include "nativebridge/native_bridge.h" 35#include "object_callbacks.h" 36#include "offsets.h" 37#include "profiler_options.h" 38#include "quick/quick_method_frame_info.h" 39#include "runtime_stats.h" 40#include "safe_map.h" 41 42namespace art { 43 44namespace gc { 45 class Heap; 46} // namespace gc 47namespace mirror { 48 class ArtMethod; 49 class ClassLoader; 50 class Array; 51 template<class T> class ObjectArray; 52 template<class T> class PrimitiveArray; 53 typedef PrimitiveArray<int8_t> ByteArray; 54 class String; 55 class Throwable; 56} // namespace mirror 57namespace verifier { 58class MethodVerifier; 59} 60class ClassLinker; 61class DexFile; 62class InternTable; 63class JavaVMExt; 64class MonitorList; 65class MonitorPool; 66class NullPointerHandler; 67class SignalCatcher; 68class StackOverflowHandler; 69class SuspensionHandler; 70class ThreadList; 71class Trace; 72class Transaction; 73 74typedef std::vector<std::pair<std::string, const void*>> RuntimeOptions; 75 76// Not all combinations of flags are valid. You may not visit all roots as well as the new roots 77// (no logical reason to do this). You also may not start logging new roots and stop logging new 78// roots (also no logical reason to do this). 79enum VisitRootFlags : uint8_t { 80 kVisitRootFlagAllRoots = 0x1, 81 kVisitRootFlagNewRoots = 0x2, 82 kVisitRootFlagStartLoggingNewRoots = 0x4, 83 kVisitRootFlagStopLoggingNewRoots = 0x8, 84 kVisitRootFlagClearRootLog = 0x10, 85}; 86 87class Runtime { 88 public: 89 // Creates and initializes a new runtime. 90 static bool Create(const RuntimeOptions& options, bool ignore_unrecognized) 91 SHARED_TRYLOCK_FUNCTION(true, Locks::mutator_lock_); 92 93 bool IsCompiler() const { 94 return compiler_callbacks_ != nullptr; 95 } 96 97 bool CanRelocate() const { 98 return !IsCompiler() || compiler_callbacks_->IsRelocationPossible(); 99 } 100 101 bool ShouldRelocate() const { 102 return must_relocate_ && CanRelocate(); 103 } 104 105 bool MustRelocateIfPossible() const { 106 return must_relocate_; 107 } 108 109 bool IsDex2OatEnabled() const { 110 return dex2oat_enabled_; 111 } 112 113 CompilerCallbacks* GetCompilerCallbacks() { 114 return compiler_callbacks_; 115 } 116 117 bool IsZygote() const { 118 return is_zygote_; 119 } 120 121 bool IsExplicitGcDisabled() const { 122 return is_explicit_gc_disabled_; 123 } 124 125 std::string GetCompilerExecutable() const; 126 std::string GetPatchoatExecutable() const; 127 128 const std::vector<std::string>& GetCompilerOptions() const { 129 return compiler_options_; 130 } 131 132 const std::vector<std::string>& GetImageCompilerOptions() const { 133 return image_compiler_options_; 134 } 135 136 const ProfilerOptions& GetProfilerOptions() const { 137 return profiler_options_; 138 } 139 140 // Starts a runtime, which may cause threads to be started and code to run. 141 bool Start() UNLOCK_FUNCTION(Locks::mutator_lock_); 142 143 bool IsShuttingDown(Thread* self); 144 bool IsShuttingDownLocked() const EXCLUSIVE_LOCKS_REQUIRED(Locks::runtime_shutdown_lock_) { 145 return shutting_down_; 146 } 147 148 size_t NumberOfThreadsBeingBorn() const EXCLUSIVE_LOCKS_REQUIRED(Locks::runtime_shutdown_lock_) { 149 return threads_being_born_; 150 } 151 152 void StartThreadBirth() EXCLUSIVE_LOCKS_REQUIRED(Locks::runtime_shutdown_lock_) { 153 threads_being_born_++; 154 } 155 156 void EndThreadBirth() EXCLUSIVE_LOCKS_REQUIRED(Locks::runtime_shutdown_lock_); 157 158 bool IsStarted() const { 159 return started_; 160 } 161 162 bool IsFinishedStarting() const { 163 return finished_starting_; 164 } 165 166 static Runtime* Current() { 167 return instance_; 168 } 169 170 // Aborts semi-cleanly. Used in the implementation of LOG(FATAL), which most 171 // callers should prefer. 172 // This isn't marked ((noreturn)) because then gcc will merge multiple calls 173 // in a single function together. This reduces code size slightly, but means 174 // that the native stack trace we get may point at the wrong call site. 175 static void Abort() LOCKS_EXCLUDED(Locks::abort_lock_); 176 177 // Returns the "main" ThreadGroup, used when attaching user threads. 178 jobject GetMainThreadGroup() const; 179 180 // Returns the "system" ThreadGroup, used when attaching our internal threads. 181 jobject GetSystemThreadGroup() const; 182 183 // Returns the system ClassLoader which represents the CLASSPATH. 184 jobject GetSystemClassLoader() const; 185 186 // Attaches the calling native thread to the runtime. 187 bool AttachCurrentThread(const char* thread_name, bool as_daemon, jobject thread_group, 188 bool create_peer); 189 190 void CallExitHook(jint status); 191 192 // Detaches the current native thread from the runtime. 193 void DetachCurrentThread() LOCKS_EXCLUDED(Locks::mutator_lock_); 194 195 void DumpForSigQuit(std::ostream& os) 196 EXCLUSIVE_LOCKS_REQUIRED(Locks::mutator_lock_); 197 void DumpLockHolders(std::ostream& os); 198 199 ~Runtime(); 200 201 const std::string& GetBootClassPathString() const { 202 return boot_class_path_string_; 203 } 204 205 const std::string& GetClassPathString() const { 206 return class_path_string_; 207 } 208 209 ClassLinker* GetClassLinker() const { 210 return class_linker_; 211 } 212 213 size_t GetDefaultStackSize() const { 214 return default_stack_size_; 215 } 216 217 gc::Heap* GetHeap() const { 218 return heap_; 219 } 220 221 InternTable* GetInternTable() const { 222 DCHECK(intern_table_ != NULL); 223 return intern_table_; 224 } 225 226 JavaVMExt* GetJavaVM() const { 227 return java_vm_; 228 } 229 230 size_t GetMaxSpinsBeforeThinkLockInflation() const { 231 return max_spins_before_thin_lock_inflation_; 232 } 233 234 MonitorList* GetMonitorList() const { 235 return monitor_list_; 236 } 237 238 MonitorPool* GetMonitorPool() const { 239 return monitor_pool_; 240 } 241 242 mirror::Throwable* GetPreAllocatedOutOfMemoryError() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 243 244 const std::vector<std::string>& GetProperties() const { 245 return properties_; 246 } 247 248 ThreadList* GetThreadList() const { 249 return thread_list_; 250 } 251 252 static const char* GetVersion() { 253 return "2.1.0"; 254 } 255 256 void DisallowNewSystemWeaks() EXCLUSIVE_LOCKS_REQUIRED(Locks::mutator_lock_); 257 void AllowNewSystemWeaks() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 258 259 // Visit all the roots. If only_dirty is true then non-dirty roots won't be visited. If 260 // clean_dirty is true then dirty roots will be marked as non-dirty after visiting. 261 void VisitRoots(RootCallback* visitor, void* arg, VisitRootFlags flags = kVisitRootFlagAllRoots) 262 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 263 264 // Visit all of the roots we can do safely do concurrently. 265 void VisitConcurrentRoots(RootCallback* visitor, void* arg, 266 VisitRootFlags flags = kVisitRootFlagAllRoots) 267 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 268 269 // Visit all of the non thread roots, we can do this with mutators unpaused. 270 void VisitNonThreadRoots(RootCallback* visitor, void* arg) 271 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 272 273 // Visit all other roots which must be done with mutators suspended. 274 void VisitNonConcurrentRoots(RootCallback* visitor, void* arg) 275 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 276 277 // Sweep system weaks, the system weak is deleted if the visitor return nullptr. Otherwise, the 278 // system weak is updated to be the visitor's returned value. 279 void SweepSystemWeaks(IsMarkedCallback* visitor, void* arg) 280 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 281 282 // Constant roots are the roots which never change after the runtime is initialized, they only 283 // need to be visited once per GC cycle. 284 void VisitConstantRoots(RootCallback* callback, void* arg) 285 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 286 287 // Returns a special method that calls into a trampoline for runtime method resolution 288 mirror::ArtMethod* GetResolutionMethod() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 289 290 bool HasResolutionMethod() const { 291 return !resolution_method_.IsNull(); 292 } 293 294 void SetResolutionMethod(mirror::ArtMethod* method) { 295 resolution_method_ = GcRoot<mirror::ArtMethod>(method); 296 } 297 298 mirror::ArtMethod* CreateResolutionMethod() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 299 300 // Returns a special method that calls into a trampoline for runtime imt conflicts. 301 mirror::ArtMethod* GetImtConflictMethod() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 302 303 bool HasImtConflictMethod() const { 304 return !imt_conflict_method_.IsNull(); 305 } 306 307 void SetImtConflictMethod(mirror::ArtMethod* method) { 308 imt_conflict_method_ = GcRoot<mirror::ArtMethod>(method); 309 } 310 311 mirror::ArtMethod* CreateImtConflictMethod() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 312 313 // Returns an imt with every entry set to conflict, used as default imt for all classes. 314 mirror::ObjectArray<mirror::ArtMethod>* GetDefaultImt() 315 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 316 317 bool HasDefaultImt() const { 318 return !default_imt_.IsNull(); 319 } 320 321 void SetDefaultImt(mirror::ObjectArray<mirror::ArtMethod>* imt) { 322 default_imt_ = GcRoot<mirror::ObjectArray<mirror::ArtMethod>>(imt); 323 } 324 325 mirror::ObjectArray<mirror::ArtMethod>* CreateDefaultImt(ClassLinker* cl) 326 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 327 328 // Returns a special method that describes all callee saves being spilled to the stack. 329 enum CalleeSaveType { 330 kSaveAll, 331 kRefsOnly, 332 kRefsAndArgs, 333 kLastCalleeSaveType // Value used for iteration 334 }; 335 336 bool HasCalleeSaveMethod(CalleeSaveType type) const { 337 return !callee_save_methods_[type].IsNull(); 338 } 339 340 mirror::ArtMethod* GetCalleeSaveMethod(CalleeSaveType type) 341 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 342 343 mirror::ArtMethod* GetCalleeSaveMethodUnchecked(CalleeSaveType type) 344 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 345 346 QuickMethodFrameInfo GetCalleeSaveMethodFrameInfo(CalleeSaveType type) const { 347 return callee_save_method_frame_infos_[type]; 348 } 349 350 QuickMethodFrameInfo GetRuntimeMethodFrameInfo(mirror::ArtMethod* method) 351 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 352 353 static size_t GetCalleeSaveMethodOffset(CalleeSaveType type) { 354 return OFFSETOF_MEMBER(Runtime, callee_save_methods_[type]); 355 } 356 357 InstructionSet GetInstructionSet() const { 358 return instruction_set_; 359 } 360 361 void SetInstructionSet(InstructionSet instruction_set); 362 363 void SetCalleeSaveMethod(mirror::ArtMethod* method, CalleeSaveType type); 364 365 mirror::ArtMethod* CreateCalleeSaveMethod(CalleeSaveType type) 366 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 367 368 int32_t GetStat(int kind); 369 370 RuntimeStats* GetStats() { 371 return &stats_; 372 } 373 374 bool HasStatsEnabled() const { 375 return stats_enabled_; 376 } 377 378 void ResetStats(int kinds); 379 380 void SetStatsEnabled(bool new_state); 381 382 void PreZygoteFork(); 383 bool InitZygote(); 384 void DidForkFromZygote(); 385 386 const instrumentation::Instrumentation* GetInstrumentation() const { 387 return &instrumentation_; 388 } 389 390 instrumentation::Instrumentation* GetInstrumentation() { 391 return &instrumentation_; 392 } 393 394 bool UseCompileTimeClassPath() const { 395 return use_compile_time_class_path_; 396 } 397 398 void AddMethodVerifier(verifier::MethodVerifier* verifier) LOCKS_EXCLUDED(method_verifier_lock_); 399 void RemoveMethodVerifier(verifier::MethodVerifier* verifier) 400 LOCKS_EXCLUDED(method_verifier_lock_); 401 402 const std::vector<const DexFile*>& GetCompileTimeClassPath(jobject class_loader); 403 void SetCompileTimeClassPath(jobject class_loader, std::vector<const DexFile*>& class_path); 404 405 void StartProfiler(const char* profile_output_filename); 406 void UpdateProfilerState(int state); 407 408 // Transaction support. 409 bool IsActiveTransaction() const { 410 return preinitialization_transaction_ != nullptr; 411 } 412 void EnterTransactionMode(Transaction* transaction); 413 void ExitTransactionMode(); 414 void RecordWriteField32(mirror::Object* obj, MemberOffset field_offset, uint32_t value, 415 bool is_volatile) const; 416 void RecordWriteField64(mirror::Object* obj, MemberOffset field_offset, uint64_t value, 417 bool is_volatile) const; 418 void RecordWriteFieldReference(mirror::Object* obj, MemberOffset field_offset, 419 mirror::Object* value, bool is_volatile) const; 420 void RecordWriteArray(mirror::Array* array, size_t index, uint64_t value) const 421 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 422 void RecordStrongStringInsertion(mirror::String* s, uint32_t hash_code) const 423 EXCLUSIVE_LOCKS_REQUIRED(Locks::intern_table_lock_); 424 void RecordWeakStringInsertion(mirror::String* s, uint32_t hash_code) const 425 EXCLUSIVE_LOCKS_REQUIRED(Locks::intern_table_lock_); 426 void RecordStrongStringRemoval(mirror::String* s, uint32_t hash_code) const 427 EXCLUSIVE_LOCKS_REQUIRED(Locks::intern_table_lock_); 428 void RecordWeakStringRemoval(mirror::String* s, uint32_t hash_code) const 429 EXCLUSIVE_LOCKS_REQUIRED(Locks::intern_table_lock_); 430 431 void SetFaultMessage(const std::string& message); 432 // Only read by the signal handler, NO_THREAD_SAFETY_ANALYSIS to prevent lock order violations 433 // with the unexpected_signal_lock_. 434 const std::string& GetFaultMessage() NO_THREAD_SAFETY_ANALYSIS { 435 return fault_message_; 436 } 437 438 void AddCurrentRuntimeFeaturesAsDex2OatArguments(std::vector<std::string>* arg_vector) const; 439 440 bool ExplicitNullChecks() const { 441 return null_pointer_handler_ == nullptr; 442 } 443 444 bool ExplicitSuspendChecks() const { 445 return suspend_handler_ == nullptr; 446 } 447 448 bool ExplicitStackOverflowChecks() const { 449 return stack_overflow_handler_ == nullptr; 450 } 451 452 bool IsVerificationEnabled() const { 453 return verify_; 454 } 455 456 bool RunningOnValgrind() const { 457 return running_on_valgrind_; 458 } 459 460 void SetTargetSdkVersion(int32_t version) { 461 target_sdk_version_ = version; 462 } 463 464 int32_t GetTargetSdkVersion() const { 465 return target_sdk_version_; 466 } 467 468 static const char* GetDefaultInstructionSetFeatures() { 469 return kDefaultInstructionSetFeatures; 470 } 471 472 private: 473 static void InitPlatformSignalHandlers(); 474 475 Runtime(); 476 477 void BlockSignals(); 478 479 bool Init(const RuntimeOptions& options, bool ignore_unrecognized) 480 SHARED_TRYLOCK_FUNCTION(true, Locks::mutator_lock_); 481 void InitNativeMethods() LOCKS_EXCLUDED(Locks::mutator_lock_); 482 void InitThreadGroups(Thread* self); 483 void RegisterRuntimeNativeMethods(JNIEnv* env); 484 485 void StartDaemonThreads(); 486 void StartSignalCatcher(); 487 488 // A pointer to the active runtime or NULL. 489 static Runtime* instance_; 490 491 static const char* kDefaultInstructionSetFeatures; 492 493 // NOTE: these must match the gc::ProcessState values as they come directly from the framework. 494 static constexpr int kProfileForground = 0; 495 static constexpr int kProfileBackgrouud = 1; 496 497 GcRoot<mirror::ArtMethod> callee_save_methods_[kLastCalleeSaveType]; 498 GcRoot<mirror::Throwable> pre_allocated_OutOfMemoryError_; 499 GcRoot<mirror::ArtMethod> resolution_method_; 500 GcRoot<mirror::ArtMethod> imt_conflict_method_; 501 GcRoot<mirror::ObjectArray<mirror::ArtMethod>> default_imt_; 502 503 InstructionSet instruction_set_; 504 QuickMethodFrameInfo callee_save_method_frame_infos_[kLastCalleeSaveType]; 505 506 CompilerCallbacks* compiler_callbacks_; 507 bool is_zygote_; 508 bool must_relocate_; 509 bool is_concurrent_gc_enabled_; 510 bool is_explicit_gc_disabled_; 511 bool dex2oat_enabled_; 512 513 std::string compiler_executable_; 514 std::string patchoat_executable_; 515 std::vector<std::string> compiler_options_; 516 std::vector<std::string> image_compiler_options_; 517 518 std::string boot_class_path_string_; 519 std::string class_path_string_; 520 std::vector<std::string> properties_; 521 522 // The default stack size for managed threads created by the runtime. 523 size_t default_stack_size_; 524 525 gc::Heap* heap_; 526 527 // The number of spins that are done before thread suspension is used to forcibly inflate. 528 size_t max_spins_before_thin_lock_inflation_; 529 MonitorList* monitor_list_; 530 MonitorPool* monitor_pool_; 531 532 ThreadList* thread_list_; 533 534 InternTable* intern_table_; 535 536 ClassLinker* class_linker_; 537 538 SignalCatcher* signal_catcher_; 539 std::string stack_trace_file_; 540 541 JavaVMExt* java_vm_; 542 543 // Fault message, printed when we get a SIGSEGV. 544 Mutex fault_message_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER; 545 std::string fault_message_ GUARDED_BY(fault_message_lock_); 546 547 // Method verifier set, used so that we can update their GC roots. 548 Mutex method_verifier_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER; 549 std::set<verifier::MethodVerifier*> method_verifiers_; 550 551 // A non-zero value indicates that a thread has been created but not yet initialized. Guarded by 552 // the shutdown lock so that threads aren't born while we're shutting down. 553 size_t threads_being_born_ GUARDED_BY(Locks::runtime_shutdown_lock_); 554 555 // Waited upon until no threads are being born. 556 std::unique_ptr<ConditionVariable> shutdown_cond_ GUARDED_BY(Locks::runtime_shutdown_lock_); 557 558 // Set when runtime shutdown is past the point that new threads may attach. 559 bool shutting_down_ GUARDED_BY(Locks::runtime_shutdown_lock_); 560 561 // The runtime is starting to shutdown but is blocked waiting on shutdown_cond_. 562 bool shutting_down_started_ GUARDED_BY(Locks::runtime_shutdown_lock_); 563 564 bool started_; 565 566 // New flag added which tells us if the runtime has finished starting. If 567 // this flag is set then the Daemon threads are created and the class loader 568 // is created. This flag is needed for knowing if its safe to request CMS. 569 bool finished_starting_; 570 571 // Hooks supported by JNI_CreateJavaVM 572 jint (*vfprintf_)(FILE* stream, const char* format, va_list ap); 573 void (*exit_)(jint status); 574 void (*abort_)(); 575 576 bool stats_enabled_; 577 RuntimeStats stats_; 578 579 const bool running_on_valgrind_; 580 581 std::string profile_output_filename_; 582 ProfilerOptions profiler_options_; 583 bool profiler_started_; 584 585 bool method_trace_; 586 std::string method_trace_file_; 587 size_t method_trace_file_size_; 588 instrumentation::Instrumentation instrumentation_; 589 590 typedef SafeMap<jobject, std::vector<const DexFile*>, JobjectComparator> CompileTimeClassPaths; 591 CompileTimeClassPaths compile_time_class_paths_; 592 bool use_compile_time_class_path_; 593 594 jobject main_thread_group_; 595 jobject system_thread_group_; 596 597 // As returned by ClassLoader.getSystemClassLoader(). 598 jobject system_class_loader_; 599 600 // If true, then we dump the GC cumulative timings on shutdown. 601 bool dump_gc_performance_on_shutdown_; 602 603 // Transaction used for pre-initializing classes at compilation time. 604 Transaction* preinitialization_transaction_; 605 NullPointerHandler* null_pointer_handler_; 606 SuspensionHandler* suspend_handler_; 607 StackOverflowHandler* stack_overflow_handler_; 608 609 // If false, verification is disabled. True by default. 610 bool verify_; 611 612 // Specifies target SDK version to allow workarounds for certain API levels. 613 int32_t target_sdk_version_; 614 615 // Implicit checks flags. 616 bool implicit_null_checks_; // NullPointer checks are implicit. 617 bool implicit_so_checks_; // StackOverflow checks are implicit. 618 bool implicit_suspend_checks_; // Thread suspension checks are implicit. 619 620 // The filename to the native bridge library. If this is not empty the native bridge will be 621 // initialized and loaded from the given file (initialized and available). An empty value means 622 // that there's no native bridge (initialized but not available). 623 // 624 // The native bridge allows running native code compiled for a foreign ISA. The way it works is, 625 // if standard dlopen fails to load native library associated with native activity, it calls to 626 // the native bridge to load it and then gets the trampoline for the entry to native activity. 627 std::string native_bridge_library_filename_; 628 629 // Native bridge library runtime callbacks. They represent the runtime interface to native bridge. 630 // 631 // The interface is expected to expose the following methods: 632 // getMethodShorty(): in the case of native method calling JNI native function CallXXXXMethodY(), 633 // native bridge calls back to VM for the shorty of the method so that it can prepare based on 634 // host calling convention. 635 // getNativeMethodCount() and getNativeMethods(): in case of JNI function UnregisterNatives(), 636 // native bridge can call back to get all native methods of specified class so that all 637 // corresponding trampolines can be destroyed. 638 android::NativeBridgeRuntimeCallbacks native_bridge_art_callbacks_; 639 640 DISALLOW_COPY_AND_ASSIGN(Runtime); 641}; 642 643} // namespace art 644 645#endif // ART_RUNTIME_RUNTIME_H_ 646