runtime.h revision 31d8f5295c24730a57cb36cbc41197f0b7e8397c
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 "base/allocator.h" 30#include "compiler_callbacks.h" 31#include "gc_root.h" 32#include "instrumentation.h" 33#include "instruction_set.h" 34#include "jobject_comparator.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_ && IsImageDex2OatEnabled(); 111 } 112 113 bool IsImageDex2OatEnabled() const { 114 return image_dex2oat_enabled_; 115 } 116 117 CompilerCallbacks* GetCompilerCallbacks() { 118 return compiler_callbacks_; 119 } 120 121 bool IsZygote() const { 122 return is_zygote_; 123 } 124 125 bool IsExplicitGcDisabled() const { 126 return is_explicit_gc_disabled_; 127 } 128 129 std::string GetCompilerExecutable() const; 130 std::string GetPatchoatExecutable() const; 131 132 const std::vector<std::string>& GetCompilerOptions() const { 133 return compiler_options_; 134 } 135 136 const std::vector<std::string>& GetImageCompilerOptions() const { 137 return image_compiler_options_; 138 } 139 140 const std::string& GetImageLocation() const { 141 return image_location_; 142 } 143 144 const ProfilerOptions& GetProfilerOptions() const { 145 return profiler_options_; 146 } 147 148 // Starts a runtime, which may cause threads to be started and code to run. 149 bool Start() UNLOCK_FUNCTION(Locks::mutator_lock_); 150 151 bool IsShuttingDown(Thread* self); 152 bool IsShuttingDownLocked() const EXCLUSIVE_LOCKS_REQUIRED(Locks::runtime_shutdown_lock_) { 153 return shutting_down_; 154 } 155 156 size_t NumberOfThreadsBeingBorn() const EXCLUSIVE_LOCKS_REQUIRED(Locks::runtime_shutdown_lock_) { 157 return threads_being_born_; 158 } 159 160 void StartThreadBirth() EXCLUSIVE_LOCKS_REQUIRED(Locks::runtime_shutdown_lock_) { 161 threads_being_born_++; 162 } 163 164 void EndThreadBirth() EXCLUSIVE_LOCKS_REQUIRED(Locks::runtime_shutdown_lock_); 165 166 bool IsStarted() const { 167 return started_; 168 } 169 170 bool IsFinishedStarting() const { 171 return finished_starting_; 172 } 173 174 static Runtime* Current() { 175 return instance_; 176 } 177 178 // Aborts semi-cleanly. Used in the implementation of LOG(FATAL), which most 179 // callers should prefer. 180 // This isn't marked ((noreturn)) because then gcc will merge multiple calls 181 // in a single function together. This reduces code size slightly, but means 182 // that the native stack trace we get may point at the wrong call site. 183 static void Abort() LOCKS_EXCLUDED(Locks::abort_lock_); 184 185 // Returns the "main" ThreadGroup, used when attaching user threads. 186 jobject GetMainThreadGroup() const; 187 188 // Returns the "system" ThreadGroup, used when attaching our internal threads. 189 jobject GetSystemThreadGroup() const; 190 191 // Returns the system ClassLoader which represents the CLASSPATH. 192 jobject GetSystemClassLoader() const; 193 194 // Attaches the calling native thread to the runtime. 195 bool AttachCurrentThread(const char* thread_name, bool as_daemon, jobject thread_group, 196 bool create_peer); 197 198 void CallExitHook(jint status); 199 200 // Detaches the current native thread from the runtime. 201 void DetachCurrentThread() LOCKS_EXCLUDED(Locks::mutator_lock_); 202 203 void DumpForSigQuit(std::ostream& os); 204 void DumpLockHolders(std::ostream& os); 205 206 ~Runtime(); 207 208 const std::string& GetBootClassPathString() const { 209 return boot_class_path_string_; 210 } 211 212 const std::string& GetClassPathString() const { 213 return class_path_string_; 214 } 215 216 ClassLinker* GetClassLinker() const { 217 return class_linker_; 218 } 219 220 size_t GetDefaultStackSize() const { 221 return default_stack_size_; 222 } 223 224 gc::Heap* GetHeap() const { 225 return heap_; 226 } 227 228 InternTable* GetInternTable() const { 229 DCHECK(intern_table_ != NULL); 230 return intern_table_; 231 } 232 233 JavaVMExt* GetJavaVM() const { 234 return java_vm_; 235 } 236 237 size_t GetMaxSpinsBeforeThinkLockInflation() const { 238 return max_spins_before_thin_lock_inflation_; 239 } 240 241 MonitorList* GetMonitorList() const { 242 return monitor_list_; 243 } 244 245 MonitorPool* GetMonitorPool() const { 246 return monitor_pool_; 247 } 248 249 // Is the given object the special object used to mark a cleared JNI weak global? 250 bool IsClearedJniWeakGlobal(mirror::Object* obj) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 251 252 // Get the special object used to mark a cleared JNI weak global. 253 mirror::Object* GetClearedJniWeakGlobal() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 254 255 mirror::Throwable* GetPreAllocatedOutOfMemoryError() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 256 257 mirror::Throwable* GetPreAllocatedNoClassDefFoundError() 258 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 259 260 const std::vector<std::string>& GetProperties() const { 261 return properties_; 262 } 263 264 ThreadList* GetThreadList() const { 265 return thread_list_; 266 } 267 268 static const char* GetVersion() { 269 return "2.1.0"; 270 } 271 272 void DisallowNewSystemWeaks() EXCLUSIVE_LOCKS_REQUIRED(Locks::mutator_lock_); 273 void AllowNewSystemWeaks() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 274 275 // Visit all the roots. If only_dirty is true then non-dirty roots won't be visited. If 276 // clean_dirty is true then dirty roots will be marked as non-dirty after visiting. 277 void VisitRoots(RootCallback* visitor, void* arg, VisitRootFlags flags = kVisitRootFlagAllRoots) 278 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 279 280 // Visit all of the roots we can do safely do concurrently. 281 void VisitConcurrentRoots(RootCallback* visitor, void* arg, 282 VisitRootFlags flags = kVisitRootFlagAllRoots) 283 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 284 285 // Visit all of the non thread roots, we can do this with mutators unpaused. 286 void VisitNonThreadRoots(RootCallback* visitor, void* arg) 287 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 288 289 // Visit all other roots which must be done with mutators suspended. 290 void VisitNonConcurrentRoots(RootCallback* visitor, void* arg) 291 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 292 293 // Sweep system weaks, the system weak is deleted if the visitor return nullptr. Otherwise, the 294 // system weak is updated to be the visitor's returned value. 295 void SweepSystemWeaks(IsMarkedCallback* visitor, void* arg) 296 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 297 298 // Constant roots are the roots which never change after the runtime is initialized, they only 299 // need to be visited once per GC cycle. 300 void VisitConstantRoots(RootCallback* callback, void* arg) 301 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 302 303 // Returns a special method that calls into a trampoline for runtime method resolution 304 mirror::ArtMethod* GetResolutionMethod() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 305 306 bool HasResolutionMethod() const { 307 return !resolution_method_.IsNull(); 308 } 309 310 void SetResolutionMethod(mirror::ArtMethod* method) { 311 resolution_method_ = GcRoot<mirror::ArtMethod>(method); 312 } 313 314 mirror::ArtMethod* CreateResolutionMethod() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 315 316 // Returns a special method that calls into a trampoline for runtime imt conflicts. 317 mirror::ArtMethod* GetImtConflictMethod() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 318 319 bool HasImtConflictMethod() const { 320 return !imt_conflict_method_.IsNull(); 321 } 322 323 void SetImtConflictMethod(mirror::ArtMethod* method) { 324 imt_conflict_method_ = GcRoot<mirror::ArtMethod>(method); 325 } 326 327 mirror::ArtMethod* CreateImtConflictMethod() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 328 329 // Returns an imt with every entry set to conflict, used as default imt for all classes. 330 mirror::ObjectArray<mirror::ArtMethod>* GetDefaultImt() 331 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 332 333 bool HasDefaultImt() const { 334 return !default_imt_.IsNull(); 335 } 336 337 void SetDefaultImt(mirror::ObjectArray<mirror::ArtMethod>* imt) { 338 default_imt_ = GcRoot<mirror::ObjectArray<mirror::ArtMethod>>(imt); 339 } 340 341 mirror::ObjectArray<mirror::ArtMethod>* CreateDefaultImt(ClassLinker* cl) 342 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 343 344 // Returns a special method that describes all callee saves being spilled to the stack. 345 enum CalleeSaveType { 346 kSaveAll, 347 kRefsOnly, 348 kRefsAndArgs, 349 kLastCalleeSaveType // Value used for iteration 350 }; 351 352 bool HasCalleeSaveMethod(CalleeSaveType type) const { 353 return !callee_save_methods_[type].IsNull(); 354 } 355 356 mirror::ArtMethod* GetCalleeSaveMethod(CalleeSaveType type) 357 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 358 359 mirror::ArtMethod* GetCalleeSaveMethodUnchecked(CalleeSaveType type) 360 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 361 362 QuickMethodFrameInfo GetCalleeSaveMethodFrameInfo(CalleeSaveType type) const { 363 return callee_save_method_frame_infos_[type]; 364 } 365 366 QuickMethodFrameInfo GetRuntimeMethodFrameInfo(mirror::ArtMethod* method) 367 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 368 369 static size_t GetCalleeSaveMethodOffset(CalleeSaveType type) { 370 return OFFSETOF_MEMBER(Runtime, callee_save_methods_[type]); 371 } 372 373 InstructionSet GetInstructionSet() const { 374 return instruction_set_; 375 } 376 377 void SetInstructionSet(InstructionSet instruction_set); 378 379 void SetCalleeSaveMethod(mirror::ArtMethod* method, CalleeSaveType type); 380 381 mirror::ArtMethod* CreateCalleeSaveMethod(CalleeSaveType type) 382 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 383 384 int32_t GetStat(int kind); 385 386 RuntimeStats* GetStats() { 387 return &stats_; 388 } 389 390 bool HasStatsEnabled() const { 391 return stats_enabled_; 392 } 393 394 void ResetStats(int kinds); 395 396 void SetStatsEnabled(bool new_state) LOCKS_EXCLUDED(Locks::instrument_entrypoints_lock_, 397 Locks::mutator_lock_); 398 399 enum class NativeBridgeAction { // private 400 kUnload, 401 kInitialize 402 }; 403 void PreZygoteFork(); 404 bool InitZygote(); 405 void DidForkFromZygote(JNIEnv* env, NativeBridgeAction action, const char* isa); 406 407 const instrumentation::Instrumentation* GetInstrumentation() const { 408 return &instrumentation_; 409 } 410 411 instrumentation::Instrumentation* GetInstrumentation() { 412 return &instrumentation_; 413 } 414 415 bool UseCompileTimeClassPath() const { 416 return use_compile_time_class_path_; 417 } 418 419 void AddMethodVerifier(verifier::MethodVerifier* verifier) LOCKS_EXCLUDED(method_verifier_lock_); 420 void RemoveMethodVerifier(verifier::MethodVerifier* verifier) 421 LOCKS_EXCLUDED(method_verifier_lock_); 422 423 const std::vector<const DexFile*>& GetCompileTimeClassPath(jobject class_loader); 424 void SetCompileTimeClassPath(jobject class_loader, std::vector<const DexFile*>& class_path); 425 426 void StartProfiler(const char* profile_output_filename); 427 void UpdateProfilerState(int state); 428 429 // Transaction support. 430 bool IsActiveTransaction() const { 431 return preinitialization_transaction_ != nullptr; 432 } 433 void EnterTransactionMode(Transaction* transaction); 434 void ExitTransactionMode(); 435 void RecordWriteFieldBoolean(mirror::Object* obj, MemberOffset field_offset, uint8_t value, 436 bool is_volatile) const; 437 void RecordWriteFieldByte(mirror::Object* obj, MemberOffset field_offset, int8_t value, 438 bool is_volatile) const; 439 void RecordWriteFieldChar(mirror::Object* obj, MemberOffset field_offset, uint16_t value, 440 bool is_volatile) const; 441 void RecordWriteFieldShort(mirror::Object* obj, MemberOffset field_offset, int16_t value, 442 bool is_volatile) const; 443 void RecordWriteField32(mirror::Object* obj, MemberOffset field_offset, uint32_t value, 444 bool is_volatile) const; 445 void RecordWriteField64(mirror::Object* obj, MemberOffset field_offset, uint64_t value, 446 bool is_volatile) const; 447 void RecordWriteFieldReference(mirror::Object* obj, MemberOffset field_offset, 448 mirror::Object* value, bool is_volatile) const; 449 void RecordWriteArray(mirror::Array* array, size_t index, uint64_t value) const 450 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 451 void RecordStrongStringInsertion(mirror::String* s) const 452 EXCLUSIVE_LOCKS_REQUIRED(Locks::intern_table_lock_); 453 void RecordWeakStringInsertion(mirror::String* s) const 454 EXCLUSIVE_LOCKS_REQUIRED(Locks::intern_table_lock_); 455 void RecordStrongStringRemoval(mirror::String* s) const 456 EXCLUSIVE_LOCKS_REQUIRED(Locks::intern_table_lock_); 457 void RecordWeakStringRemoval(mirror::String* s) const 458 EXCLUSIVE_LOCKS_REQUIRED(Locks::intern_table_lock_); 459 460 void SetFaultMessage(const std::string& message); 461 // Only read by the signal handler, NO_THREAD_SAFETY_ANALYSIS to prevent lock order violations 462 // with the unexpected_signal_lock_. 463 const std::string& GetFaultMessage() NO_THREAD_SAFETY_ANALYSIS { 464 return fault_message_; 465 } 466 467 void AddCurrentRuntimeFeaturesAsDex2OatArguments(std::vector<std::string>* arg_vector) const; 468 469 bool ExplicitStackOverflowChecks() const { 470 return !implicit_so_checks_; 471 } 472 473 bool IsVerificationEnabled() const { 474 return verify_; 475 } 476 477 bool RunningOnValgrind() const { 478 return running_on_valgrind_; 479 } 480 481 void SetTargetSdkVersion(int32_t version) { 482 target_sdk_version_ = version; 483 } 484 485 int32_t GetTargetSdkVersion() const { 486 return target_sdk_version_; 487 } 488 489 static const char* GetDefaultInstructionSetFeatures() { 490 return kDefaultInstructionSetFeatures; 491 } 492 493 private: 494 static void InitPlatformSignalHandlers(); 495 496 Runtime(); 497 498 void BlockSignals(); 499 500 bool Init(const RuntimeOptions& options, bool ignore_unrecognized) 501 SHARED_TRYLOCK_FUNCTION(true, Locks::mutator_lock_); 502 void InitNativeMethods() LOCKS_EXCLUDED(Locks::mutator_lock_); 503 void InitThreadGroups(Thread* self); 504 void RegisterRuntimeNativeMethods(JNIEnv* env); 505 506 void StartDaemonThreads(); 507 void StartSignalCatcher(); 508 509 // A pointer to the active runtime or NULL. 510 static Runtime* instance_; 511 512 static const char* kDefaultInstructionSetFeatures; 513 514 // NOTE: these must match the gc::ProcessState values as they come directly from the framework. 515 static constexpr int kProfileForground = 0; 516 static constexpr int kProfileBackgrouud = 1; 517 518 GcRoot<mirror::ArtMethod> callee_save_methods_[kLastCalleeSaveType]; 519 GcRoot<mirror::Throwable> pre_allocated_OutOfMemoryError_; 520 GcRoot<mirror::Throwable> pre_allocated_NoClassDefFoundError_; 521 GcRoot<mirror::ArtMethod> resolution_method_; 522 GcRoot<mirror::ArtMethod> imt_conflict_method_; 523 GcRoot<mirror::ObjectArray<mirror::ArtMethod>> default_imt_; 524 525 // Special sentinel object used to invalid conditions in JNI (cleared weak references) and 526 // JDWP (invalid references). 527 GcRoot<mirror::Object> sentinel_; 528 529 InstructionSet instruction_set_; 530 QuickMethodFrameInfo callee_save_method_frame_infos_[kLastCalleeSaveType]; 531 532 CompilerCallbacks* compiler_callbacks_; 533 bool is_zygote_; 534 bool must_relocate_; 535 bool is_concurrent_gc_enabled_; 536 bool is_explicit_gc_disabled_; 537 bool dex2oat_enabled_; 538 bool image_dex2oat_enabled_; 539 540 std::string compiler_executable_; 541 std::string patchoat_executable_; 542 std::vector<std::string> compiler_options_; 543 std::vector<std::string> image_compiler_options_; 544 std::string image_location_; 545 546 std::string boot_class_path_string_; 547 std::string class_path_string_; 548 std::vector<std::string> properties_; 549 550 // The default stack size for managed threads created by the runtime. 551 size_t default_stack_size_; 552 553 gc::Heap* heap_; 554 555 // The number of spins that are done before thread suspension is used to forcibly inflate. 556 size_t max_spins_before_thin_lock_inflation_; 557 MonitorList* monitor_list_; 558 MonitorPool* monitor_pool_; 559 560 ThreadList* thread_list_; 561 562 InternTable* intern_table_; 563 564 ClassLinker* class_linker_; 565 566 SignalCatcher* signal_catcher_; 567 std::string stack_trace_file_; 568 569 JavaVMExt* java_vm_; 570 571 // Fault message, printed when we get a SIGSEGV. 572 Mutex fault_message_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER; 573 std::string fault_message_ GUARDED_BY(fault_message_lock_); 574 575 // Method verifier set, used so that we can update their GC roots. 576 Mutex method_verifier_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER; 577 std::set<verifier::MethodVerifier*> method_verifiers_; 578 579 // A non-zero value indicates that a thread has been created but not yet initialized. Guarded by 580 // the shutdown lock so that threads aren't born while we're shutting down. 581 size_t threads_being_born_ GUARDED_BY(Locks::runtime_shutdown_lock_); 582 583 // Waited upon until no threads are being born. 584 std::unique_ptr<ConditionVariable> shutdown_cond_ GUARDED_BY(Locks::runtime_shutdown_lock_); 585 586 // Set when runtime shutdown is past the point that new threads may attach. 587 bool shutting_down_ GUARDED_BY(Locks::runtime_shutdown_lock_); 588 589 // The runtime is starting to shutdown but is blocked waiting on shutdown_cond_. 590 bool shutting_down_started_ GUARDED_BY(Locks::runtime_shutdown_lock_); 591 592 bool started_; 593 594 // New flag added which tells us if the runtime has finished starting. If 595 // this flag is set then the Daemon threads are created and the class loader 596 // is created. This flag is needed for knowing if its safe to request CMS. 597 bool finished_starting_; 598 599 // Hooks supported by JNI_CreateJavaVM 600 jint (*vfprintf_)(FILE* stream, const char* format, va_list ap); 601 void (*exit_)(jint status); 602 void (*abort_)(); 603 604 bool stats_enabled_; 605 RuntimeStats stats_; 606 607 const bool running_on_valgrind_; 608 609 std::string profile_output_filename_; 610 ProfilerOptions profiler_options_; 611 bool profiler_started_; 612 613 bool method_trace_; 614 std::string method_trace_file_; 615 size_t method_trace_file_size_; 616 instrumentation::Instrumentation instrumentation_; 617 618 typedef AllocationTrackingSafeMap<jobject, std::vector<const DexFile*>, 619 kAllocatorTagCompileTimeClassPath, JobjectComparator> 620 CompileTimeClassPaths; 621 CompileTimeClassPaths compile_time_class_paths_; 622 bool use_compile_time_class_path_; 623 624 jobject main_thread_group_; 625 jobject system_thread_group_; 626 627 // As returned by ClassLoader.getSystemClassLoader(). 628 jobject system_class_loader_; 629 630 // If true, then we dump the GC cumulative timings on shutdown. 631 bool dump_gc_performance_on_shutdown_; 632 633 // Transaction used for pre-initializing classes at compilation time. 634 Transaction* preinitialization_transaction_; 635 636 // If false, verification is disabled. True by default. 637 bool verify_; 638 639 // Specifies target SDK version to allow workarounds for certain API levels. 640 int32_t target_sdk_version_; 641 642 // Implicit checks flags. 643 bool implicit_null_checks_; // NullPointer checks are implicit. 644 bool implicit_so_checks_; // StackOverflow checks are implicit. 645 bool implicit_suspend_checks_; // Thread suspension checks are implicit. 646 647 // The filename to the native bridge library. If this is not empty the native bridge will be 648 // initialized and loaded from the given file (initialized and available). An empty value means 649 // that there's no native bridge (initialized but not available). 650 // 651 // The native bridge allows running native code compiled for a foreign ISA. The way it works is, 652 // if standard dlopen fails to load native library associated with native activity, it calls to 653 // the native bridge to load it and then gets the trampoline for the entry to native activity. 654 std::string native_bridge_library_filename_; 655 656 DISALLOW_COPY_AND_ASSIGN(Runtime); 657}; 658 659} // namespace art 660 661#endif // ART_RUNTIME_RUNTIME_H_ 662