runtime.h revision 2ffb703bf431d74326c88266b4ddaf225eb3c6ad
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 <memory> 28#include <vector> 29 30#include "arch/instruction_set.h" 31#include "base/macros.h" 32#include "base/mutex.h" 33#include "deoptimization_kind.h" 34#include "dex_file_types.h" 35#include "experimental_flags.h" 36#include "gc_root.h" 37#include "instrumentation.h" 38#include "obj_ptr.h" 39#include "offsets.h" 40#include "process_state.h" 41#include "quick/quick_method_frame_info.h" 42#include "runtime_stats.h" 43 44namespace art { 45 46namespace gc { 47class AbstractSystemWeakHolder; 48class Heap; 49} // namespace gc 50 51namespace jit { 52class Jit; 53class JitOptions; 54} // namespace jit 55 56namespace mirror { 57class Array; 58class ClassLoader; 59class DexCache; 60template<class T> class ObjectArray; 61template<class T> class PrimitiveArray; 62typedef PrimitiveArray<int8_t> ByteArray; 63class String; 64class Throwable; 65} // namespace mirror 66namespace ti { 67class Agent; 68} // namespace ti 69namespace verifier { 70class MethodVerifier; 71enum class VerifyMode : int8_t; 72} // namespace verifier 73class ArenaPool; 74class ArtMethod; 75enum class CalleeSaveType: uint32_t; 76class ClassLinker; 77class CompilerCallbacks; 78class DexFile; 79class InternTable; 80class IsMarkedVisitor; 81class JavaVMExt; 82class LinearAlloc; 83class MemMap; 84class MonitorList; 85class MonitorPool; 86class NullPointerHandler; 87class OatFileManager; 88class Plugin; 89struct RuntimeArgumentMap; 90class RuntimeCallbacks; 91class SignalCatcher; 92class StackOverflowHandler; 93class SuspensionHandler; 94class ThreadList; 95class Trace; 96struct TraceConfig; 97class Transaction; 98 99typedef std::vector<std::pair<std::string, const void*>> RuntimeOptions; 100 101class Runtime { 102 public: 103 // Parse raw runtime options. 104 static bool ParseOptions(const RuntimeOptions& raw_options, 105 bool ignore_unrecognized, 106 RuntimeArgumentMap* runtime_options); 107 108 // Creates and initializes a new runtime. 109 static bool Create(RuntimeArgumentMap&& runtime_options) 110 SHARED_TRYLOCK_FUNCTION(true, Locks::mutator_lock_); 111 112 // Creates and initializes a new runtime. 113 static bool Create(const RuntimeOptions& raw_options, bool ignore_unrecognized) 114 SHARED_TRYLOCK_FUNCTION(true, Locks::mutator_lock_); 115 116 // IsAotCompiler for compilers that don't have a running runtime. Only dex2oat currently. 117 bool IsAotCompiler() const { 118 return !UseJitCompilation() && IsCompiler(); 119 } 120 121 // IsCompiler is any runtime which has a running compiler, either dex2oat or JIT. 122 bool IsCompiler() const { 123 return compiler_callbacks_ != nullptr; 124 } 125 126 // If a compiler, are we compiling a boot image? 127 bool IsCompilingBootImage() const; 128 129 bool CanRelocate() const; 130 131 bool ShouldRelocate() const { 132 return must_relocate_ && CanRelocate(); 133 } 134 135 bool MustRelocateIfPossible() const { 136 return must_relocate_; 137 } 138 139 bool IsDex2OatEnabled() const { 140 return dex2oat_enabled_ && IsImageDex2OatEnabled(); 141 } 142 143 bool IsImageDex2OatEnabled() const { 144 return image_dex2oat_enabled_; 145 } 146 147 CompilerCallbacks* GetCompilerCallbacks() { 148 return compiler_callbacks_; 149 } 150 151 void SetCompilerCallbacks(CompilerCallbacks* callbacks) { 152 CHECK(callbacks != nullptr); 153 compiler_callbacks_ = callbacks; 154 } 155 156 bool IsZygote() const { 157 return is_zygote_; 158 } 159 160 bool IsExplicitGcDisabled() const { 161 return is_explicit_gc_disabled_; 162 } 163 164 std::string GetCompilerExecutable() const; 165 std::string GetPatchoatExecutable() const; 166 167 const std::vector<std::string>& GetCompilerOptions() const { 168 return compiler_options_; 169 } 170 171 void AddCompilerOption(const std::string& option) { 172 compiler_options_.push_back(option); 173 } 174 175 const std::vector<std::string>& GetImageCompilerOptions() const { 176 return image_compiler_options_; 177 } 178 179 const std::string& GetImageLocation() const { 180 return image_location_; 181 } 182 183 // Starts a runtime, which may cause threads to be started and code to run. 184 bool Start() UNLOCK_FUNCTION(Locks::mutator_lock_); 185 186 bool IsShuttingDown(Thread* self); 187 bool IsShuttingDownLocked() const REQUIRES(Locks::runtime_shutdown_lock_) { 188 return shutting_down_; 189 } 190 191 size_t NumberOfThreadsBeingBorn() const REQUIRES(Locks::runtime_shutdown_lock_) { 192 return threads_being_born_; 193 } 194 195 void StartThreadBirth() REQUIRES(Locks::runtime_shutdown_lock_) { 196 threads_being_born_++; 197 } 198 199 void EndThreadBirth() REQUIRES(Locks::runtime_shutdown_lock_); 200 201 bool IsStarted() const { 202 return started_; 203 } 204 205 bool IsFinishedStarting() const { 206 return finished_starting_; 207 } 208 209 static Runtime* Current() { 210 return instance_; 211 } 212 213 // Aborts semi-cleanly. Used in the implementation of LOG(FATAL), which most 214 // callers should prefer. 215 NO_RETURN static void Abort(const char* msg) REQUIRES(!Locks::abort_lock_); 216 217 // Returns the "main" ThreadGroup, used when attaching user threads. 218 jobject GetMainThreadGroup() const; 219 220 // Returns the "system" ThreadGroup, used when attaching our internal threads. 221 jobject GetSystemThreadGroup() const; 222 223 // Returns the system ClassLoader which represents the CLASSPATH. 224 jobject GetSystemClassLoader() const; 225 226 // Attaches the calling native thread to the runtime. 227 bool AttachCurrentThread(const char* thread_name, bool as_daemon, jobject thread_group, 228 bool create_peer); 229 230 void CallExitHook(jint status); 231 232 // Detaches the current native thread from the runtime. 233 void DetachCurrentThread() REQUIRES(!Locks::mutator_lock_); 234 235 void DumpDeoptimizations(std::ostream& os); 236 void DumpForSigQuit(std::ostream& os); 237 void DumpLockHolders(std::ostream& os); 238 239 ~Runtime(); 240 241 const std::string& GetBootClassPathString() const { 242 return boot_class_path_string_; 243 } 244 245 const std::string& GetClassPathString() const { 246 return class_path_string_; 247 } 248 249 ClassLinker* GetClassLinker() const { 250 return class_linker_; 251 } 252 253 size_t GetDefaultStackSize() const { 254 return default_stack_size_; 255 } 256 257 gc::Heap* GetHeap() const { 258 return heap_; 259 } 260 261 InternTable* GetInternTable() const { 262 DCHECK(intern_table_ != nullptr); 263 return intern_table_; 264 } 265 266 JavaVMExt* GetJavaVM() const { 267 return java_vm_.get(); 268 } 269 270 size_t GetMaxSpinsBeforeThinLockInflation() const { 271 return max_spins_before_thin_lock_inflation_; 272 } 273 274 MonitorList* GetMonitorList() const { 275 return monitor_list_; 276 } 277 278 MonitorPool* GetMonitorPool() const { 279 return monitor_pool_; 280 } 281 282 // Is the given object the special object used to mark a cleared JNI weak global? 283 bool IsClearedJniWeakGlobal(ObjPtr<mirror::Object> obj) REQUIRES_SHARED(Locks::mutator_lock_); 284 285 // Get the special object used to mark a cleared JNI weak global. 286 mirror::Object* GetClearedJniWeakGlobal() REQUIRES_SHARED(Locks::mutator_lock_); 287 288 mirror::Throwable* GetPreAllocatedOutOfMemoryError() REQUIRES_SHARED(Locks::mutator_lock_); 289 290 mirror::Throwable* GetPreAllocatedNoClassDefFoundError() 291 REQUIRES_SHARED(Locks::mutator_lock_); 292 293 const std::vector<std::string>& GetProperties() const { 294 return properties_; 295 } 296 297 ThreadList* GetThreadList() const { 298 return thread_list_; 299 } 300 301 static const char* GetVersion() { 302 return "2.1.0"; 303 } 304 305 bool IsMethodHandlesEnabled() const { 306 return true; 307 } 308 309 void DisallowNewSystemWeaks() REQUIRES_SHARED(Locks::mutator_lock_); 310 void AllowNewSystemWeaks() REQUIRES_SHARED(Locks::mutator_lock_); 311 // broadcast_for_checkpoint is true when we broadcast for making blocking threads to respond to 312 // checkpoint requests. It's false when we broadcast to unblock blocking threads after system weak 313 // access is reenabled. 314 void BroadcastForNewSystemWeaks(bool broadcast_for_checkpoint = false); 315 316 // Visit all the roots. If only_dirty is true then non-dirty roots won't be visited. If 317 // clean_dirty is true then dirty roots will be marked as non-dirty after visiting. 318 void VisitRoots(RootVisitor* visitor, VisitRootFlags flags = kVisitRootFlagAllRoots) 319 REQUIRES(!Locks::classlinker_classes_lock_, !Locks::trace_lock_) 320 REQUIRES_SHARED(Locks::mutator_lock_); 321 322 // Visit image roots, only used for hprof since the GC uses the image space mod union table 323 // instead. 324 void VisitImageRoots(RootVisitor* visitor) REQUIRES_SHARED(Locks::mutator_lock_); 325 326 // Visit all of the roots we can do safely do concurrently. 327 void VisitConcurrentRoots(RootVisitor* visitor, 328 VisitRootFlags flags = kVisitRootFlagAllRoots) 329 REQUIRES(!Locks::classlinker_classes_lock_, !Locks::trace_lock_) 330 REQUIRES_SHARED(Locks::mutator_lock_); 331 332 // Visit all of the non thread roots, we can do this with mutators unpaused. 333 void VisitNonThreadRoots(RootVisitor* visitor) 334 REQUIRES_SHARED(Locks::mutator_lock_); 335 336 void VisitTransactionRoots(RootVisitor* visitor) 337 REQUIRES_SHARED(Locks::mutator_lock_); 338 339 // Sweep system weaks, the system weak is deleted if the visitor return null. Otherwise, the 340 // system weak is updated to be the visitor's returned value. 341 void SweepSystemWeaks(IsMarkedVisitor* visitor) 342 REQUIRES_SHARED(Locks::mutator_lock_); 343 344 // Returns a special method that calls into a trampoline for runtime method resolution 345 ArtMethod* GetResolutionMethod(); 346 347 bool HasResolutionMethod() const { 348 return resolution_method_ != nullptr; 349 } 350 351 void SetResolutionMethod(ArtMethod* method) REQUIRES_SHARED(Locks::mutator_lock_); 352 void ClearResolutionMethod() { 353 resolution_method_ = nullptr; 354 } 355 356 ArtMethod* CreateResolutionMethod() REQUIRES_SHARED(Locks::mutator_lock_); 357 358 // Returns a special method that calls into a trampoline for runtime imt conflicts. 359 ArtMethod* GetImtConflictMethod(); 360 ArtMethod* GetImtUnimplementedMethod(); 361 362 bool HasImtConflictMethod() const { 363 return imt_conflict_method_ != nullptr; 364 } 365 366 void ClearImtConflictMethod() { 367 imt_conflict_method_ = nullptr; 368 } 369 370 void FixupConflictTables(); 371 void SetImtConflictMethod(ArtMethod* method) REQUIRES_SHARED(Locks::mutator_lock_); 372 void SetImtUnimplementedMethod(ArtMethod* method) REQUIRES_SHARED(Locks::mutator_lock_); 373 374 ArtMethod* CreateImtConflictMethod(LinearAlloc* linear_alloc) 375 REQUIRES_SHARED(Locks::mutator_lock_); 376 377 void ClearImtUnimplementedMethod() { 378 imt_unimplemented_method_ = nullptr; 379 } 380 381 bool HasCalleeSaveMethod(CalleeSaveType type) const { 382 return callee_save_methods_[static_cast<size_t>(type)] != 0u; 383 } 384 385 ArtMethod* GetCalleeSaveMethod(CalleeSaveType type) 386 REQUIRES_SHARED(Locks::mutator_lock_); 387 388 ArtMethod* GetCalleeSaveMethodUnchecked(CalleeSaveType type) 389 REQUIRES_SHARED(Locks::mutator_lock_); 390 391 QuickMethodFrameInfo GetCalleeSaveMethodFrameInfo(CalleeSaveType type) const { 392 return callee_save_method_frame_infos_[static_cast<size_t>(type)]; 393 } 394 395 QuickMethodFrameInfo GetRuntimeMethodFrameInfo(ArtMethod* method) 396 REQUIRES_SHARED(Locks::mutator_lock_); 397 398 static size_t GetCalleeSaveMethodOffset(CalleeSaveType type) { 399 return OFFSETOF_MEMBER(Runtime, callee_save_methods_[static_cast<size_t>(type)]); 400 } 401 402 InstructionSet GetInstructionSet() const { 403 return instruction_set_; 404 } 405 406 void SetInstructionSet(InstructionSet instruction_set); 407 void ClearInstructionSet(); 408 409 void SetCalleeSaveMethod(ArtMethod* method, CalleeSaveType type); 410 void ClearCalleeSaveMethods(); 411 412 ArtMethod* CreateCalleeSaveMethod() REQUIRES_SHARED(Locks::mutator_lock_); 413 414 int32_t GetStat(int kind); 415 416 RuntimeStats* GetStats() { 417 return &stats_; 418 } 419 420 bool HasStatsEnabled() const { 421 return stats_enabled_; 422 } 423 424 void ResetStats(int kinds); 425 426 void SetStatsEnabled(bool new_state) 427 REQUIRES(!Locks::instrument_entrypoints_lock_, !Locks::mutator_lock_); 428 429 enum class NativeBridgeAction { // private 430 kUnload, 431 kInitialize 432 }; 433 434 jit::Jit* GetJit() const { 435 return jit_.get(); 436 } 437 438 // Returns true if JIT compilations are enabled. GetJit() will be not null in this case. 439 bool UseJitCompilation() const; 440 441 void PreZygoteFork(); 442 void InitNonZygoteOrPostFork( 443 JNIEnv* env, bool is_system_server, NativeBridgeAction action, const char* isa); 444 445 const instrumentation::Instrumentation* GetInstrumentation() const { 446 return &instrumentation_; 447 } 448 449 instrumentation::Instrumentation* GetInstrumentation() { 450 return &instrumentation_; 451 } 452 453 void RegisterAppInfo(const std::vector<std::string>& code_paths, 454 const std::string& profile_output_filename); 455 456 // Transaction support. 457 bool IsActiveTransaction() const; 458 void EnterTransactionMode(); 459 void EnterTransactionMode(bool strict, mirror::Class* root); 460 void ExitTransactionMode(); 461 void RollbackAllTransactions() REQUIRES_SHARED(Locks::mutator_lock_); 462 // Transaction rollback and exit transaction are always done together, it's convenience to 463 // do them in one function. 464 void RollbackAndExitTransactionMode() REQUIRES_SHARED(Locks::mutator_lock_); 465 bool IsTransactionAborted() const; 466 const std::unique_ptr<Transaction>& GetTransaction() const; 467 bool IsActiveStrictTransactionMode() const; 468 469 void AbortTransactionAndThrowAbortError(Thread* self, const std::string& abort_message) 470 REQUIRES_SHARED(Locks::mutator_lock_); 471 void ThrowTransactionAbortError(Thread* self) 472 REQUIRES_SHARED(Locks::mutator_lock_); 473 474 void RecordWriteFieldBoolean(mirror::Object* obj, MemberOffset field_offset, uint8_t value, 475 bool is_volatile) const; 476 void RecordWriteFieldByte(mirror::Object* obj, MemberOffset field_offset, int8_t value, 477 bool is_volatile) const; 478 void RecordWriteFieldChar(mirror::Object* obj, MemberOffset field_offset, uint16_t value, 479 bool is_volatile) const; 480 void RecordWriteFieldShort(mirror::Object* obj, MemberOffset field_offset, int16_t value, 481 bool is_volatile) const; 482 void RecordWriteField32(mirror::Object* obj, MemberOffset field_offset, uint32_t value, 483 bool is_volatile) const; 484 void RecordWriteField64(mirror::Object* obj, MemberOffset field_offset, uint64_t value, 485 bool is_volatile) const; 486 void RecordWriteFieldReference(mirror::Object* obj, 487 MemberOffset field_offset, 488 ObjPtr<mirror::Object> value, 489 bool is_volatile) const 490 REQUIRES_SHARED(Locks::mutator_lock_); 491 void RecordWriteArray(mirror::Array* array, size_t index, uint64_t value) const 492 REQUIRES_SHARED(Locks::mutator_lock_); 493 void RecordStrongStringInsertion(ObjPtr<mirror::String> s) const 494 REQUIRES(Locks::intern_table_lock_); 495 void RecordWeakStringInsertion(ObjPtr<mirror::String> s) const 496 REQUIRES(Locks::intern_table_lock_); 497 void RecordStrongStringRemoval(ObjPtr<mirror::String> s) const 498 REQUIRES(Locks::intern_table_lock_); 499 void RecordWeakStringRemoval(ObjPtr<mirror::String> s) const 500 REQUIRES(Locks::intern_table_lock_); 501 void RecordResolveString(ObjPtr<mirror::DexCache> dex_cache, dex::StringIndex string_idx) const 502 REQUIRES_SHARED(Locks::mutator_lock_); 503 504 void SetFaultMessage(const std::string& message) REQUIRES(!fault_message_lock_); 505 // Only read by the signal handler, NO_THREAD_SAFETY_ANALYSIS to prevent lock order violations 506 // with the unexpected_signal_lock_. 507 const std::string& GetFaultMessage() NO_THREAD_SAFETY_ANALYSIS { 508 return fault_message_; 509 } 510 511 void AddCurrentRuntimeFeaturesAsDex2OatArguments(std::vector<std::string>* arg_vector) const; 512 513 bool ExplicitStackOverflowChecks() const { 514 return !implicit_so_checks_; 515 } 516 517 void DisableVerifier(); 518 bool IsVerificationEnabled() const; 519 bool IsVerificationSoftFail() const; 520 521 bool IsDexFileFallbackEnabled() const { 522 return allow_dex_file_fallback_; 523 } 524 525 const std::vector<std::string>& GetCpuAbilist() const { 526 return cpu_abilist_; 527 } 528 529 bool IsRunningOnMemoryTool() const { 530 return is_running_on_memory_tool_; 531 } 532 533 void SetTargetSdkVersion(int32_t version) { 534 target_sdk_version_ = version; 535 } 536 537 int32_t GetTargetSdkVersion() const { 538 return target_sdk_version_; 539 } 540 541 uint32_t GetZygoteMaxFailedBoots() const { 542 return zygote_max_failed_boots_; 543 } 544 545 bool AreExperimentalFlagsEnabled(ExperimentalFlags flags) { 546 return (experimental_flags_ & flags) != ExperimentalFlags::kNone; 547 } 548 549 // Create the JIT and instrumentation and code cache. 550 void CreateJit(); 551 552 ArenaPool* GetArenaPool() { 553 return arena_pool_.get(); 554 } 555 ArenaPool* GetJitArenaPool() { 556 return jit_arena_pool_.get(); 557 } 558 const ArenaPool* GetArenaPool() const { 559 return arena_pool_.get(); 560 } 561 562 void ReclaimArenaPoolMemory(); 563 564 LinearAlloc* GetLinearAlloc() { 565 return linear_alloc_.get(); 566 } 567 568 jit::JitOptions* GetJITOptions() { 569 return jit_options_.get(); 570 } 571 572 bool IsJavaDebuggable() const { 573 return is_java_debuggable_; 574 } 575 576 void SetJavaDebuggable(bool value); 577 578 // Deoptimize the boot image, called for Java debuggable apps. 579 void DeoptimizeBootImage(); 580 581 bool IsNativeDebuggable() const { 582 return is_native_debuggable_; 583 } 584 585 void SetNativeDebuggable(bool value) { 586 is_native_debuggable_ = value; 587 } 588 589 // Returns the build fingerprint, if set. Otherwise an empty string is returned. 590 std::string GetFingerprint() { 591 return fingerprint_; 592 } 593 594 // Called from class linker. 595 void SetSentinel(mirror::Object* sentinel) REQUIRES_SHARED(Locks::mutator_lock_); 596 597 // Create a normal LinearAlloc or low 4gb version if we are 64 bit AOT compiler. 598 LinearAlloc* CreateLinearAlloc(); 599 600 OatFileManager& GetOatFileManager() const { 601 DCHECK(oat_file_manager_ != nullptr); 602 return *oat_file_manager_; 603 } 604 605 double GetHashTableMinLoadFactor() const; 606 double GetHashTableMaxLoadFactor() const; 607 608 void SetSafeMode(bool mode) { 609 safe_mode_ = mode; 610 } 611 612 bool GetDumpNativeStackOnSigQuit() const { 613 return dump_native_stack_on_sig_quit_; 614 } 615 616 bool GetPrunedDalvikCache() const { 617 return pruned_dalvik_cache_; 618 } 619 620 void SetPrunedDalvikCache(bool pruned) { 621 pruned_dalvik_cache_ = pruned; 622 } 623 624 void UpdateProcessState(ProcessState process_state); 625 626 // Returns true if we currently care about long mutator pause. 627 bool InJankPerceptibleProcessState() const { 628 return process_state_ == kProcessStateJankPerceptible; 629 } 630 631 void RegisterSensitiveThread() const; 632 633 void SetZygoteNoThreadSection(bool val) { 634 zygote_no_threads_ = val; 635 } 636 637 bool IsZygoteNoThreadSection() const { 638 return zygote_no_threads_; 639 } 640 641 // Returns if the code can be deoptimized asynchronously. Code may be compiled with some 642 // optimization that makes it impossible to deoptimize. 643 bool IsAsyncDeoptimizeable(uintptr_t code) const REQUIRES_SHARED(Locks::mutator_lock_); 644 645 // Returns a saved copy of the environment (getenv/setenv values). 646 // Used by Fork to protect against overwriting LD_LIBRARY_PATH, etc. 647 char** GetEnvSnapshot() const { 648 return env_snapshot_.GetSnapshot(); 649 } 650 651 void AddSystemWeakHolder(gc::AbstractSystemWeakHolder* holder); 652 void RemoveSystemWeakHolder(gc::AbstractSystemWeakHolder* holder); 653 654 void AttachAgent(const std::string& agent_arg); 655 656 const std::list<ti::Agent>& GetAgents() const { 657 return agents_; 658 } 659 660 RuntimeCallbacks* GetRuntimeCallbacks(); 661 662 bool HasLoadedPlugins() const { 663 return !plugins_.empty(); 664 } 665 666 void InitThreadGroups(Thread* self); 667 668 void SetDumpGCPerformanceOnShutdown(bool value) { 669 dump_gc_performance_on_shutdown_ = value; 670 } 671 672 void IncrementDeoptimizationCount(DeoptimizationKind kind) { 673 DCHECK_LE(kind, DeoptimizationKind::kLast); 674 deoptimization_counts_[static_cast<size_t>(kind)]++; 675 } 676 677 uint32_t GetNumberOfDeoptimizations() const { 678 uint32_t result = 0; 679 for (size_t i = 0; i <= static_cast<size_t>(DeoptimizationKind::kLast); ++i) { 680 result += deoptimization_counts_[i]; 681 } 682 return result; 683 } 684 685 // Whether or not we use MADV_RANDOM on files that are thought to have random access patterns. 686 // This is beneficial for low RAM devices since it reduces page cache thrashing. 687 bool MAdviseRandomAccess() const { 688 return madvise_random_access_; 689 } 690 691 private: 692 static void InitPlatformSignalHandlers(); 693 694 Runtime(); 695 696 void BlockSignals(); 697 698 bool Init(RuntimeArgumentMap&& runtime_options) 699 SHARED_TRYLOCK_FUNCTION(true, Locks::mutator_lock_); 700 void InitNativeMethods() REQUIRES(!Locks::mutator_lock_); 701 void RegisterRuntimeNativeMethods(JNIEnv* env); 702 703 void StartDaemonThreads(); 704 void StartSignalCatcher(); 705 706 void MaybeSaveJitProfilingInfo(); 707 708 // Visit all of the thread roots. 709 void VisitThreadRoots(RootVisitor* visitor, VisitRootFlags flags) 710 REQUIRES_SHARED(Locks::mutator_lock_); 711 712 // Visit all other roots which must be done with mutators suspended. 713 void VisitNonConcurrentRoots(RootVisitor* visitor, VisitRootFlags flags) 714 REQUIRES_SHARED(Locks::mutator_lock_); 715 716 // Constant roots are the roots which never change after the runtime is initialized, they only 717 // need to be visited once per GC cycle. 718 void VisitConstantRoots(RootVisitor* visitor) 719 REQUIRES_SHARED(Locks::mutator_lock_); 720 721 // A pointer to the active runtime or null. 722 static Runtime* instance_; 723 724 // NOTE: these must match the gc::ProcessState values as they come directly from the framework. 725 static constexpr int kProfileForground = 0; 726 static constexpr int kProfileBackground = 1; 727 728 static constexpr uint32_t kCalleeSaveSize = 6u; 729 730 // 64 bit so that we can share the same asm offsets for both 32 and 64 bits. 731 uint64_t callee_save_methods_[kCalleeSaveSize]; 732 GcRoot<mirror::Throwable> pre_allocated_OutOfMemoryError_; 733 GcRoot<mirror::Throwable> pre_allocated_NoClassDefFoundError_; 734 ArtMethod* resolution_method_; 735 ArtMethod* imt_conflict_method_; 736 // Unresolved method has the same behavior as the conflict method, it is used by the class linker 737 // for differentiating between unfilled imt slots vs conflict slots in superclasses. 738 ArtMethod* imt_unimplemented_method_; 739 740 // Special sentinel object used to invalid conditions in JNI (cleared weak references) and 741 // JDWP (invalid references). 742 GcRoot<mirror::Object> sentinel_; 743 744 InstructionSet instruction_set_; 745 QuickMethodFrameInfo callee_save_method_frame_infos_[kCalleeSaveSize]; 746 747 CompilerCallbacks* compiler_callbacks_; 748 bool is_zygote_; 749 bool must_relocate_; 750 bool is_concurrent_gc_enabled_; 751 bool is_explicit_gc_disabled_; 752 bool dex2oat_enabled_; 753 bool image_dex2oat_enabled_; 754 755 std::string compiler_executable_; 756 std::string patchoat_executable_; 757 std::vector<std::string> compiler_options_; 758 std::vector<std::string> image_compiler_options_; 759 std::string image_location_; 760 761 std::string boot_class_path_string_; 762 std::string class_path_string_; 763 std::vector<std::string> properties_; 764 765 std::list<ti::Agent> agents_; 766 std::vector<Plugin> plugins_; 767 768 // The default stack size for managed threads created by the runtime. 769 size_t default_stack_size_; 770 771 gc::Heap* heap_; 772 773 std::unique_ptr<ArenaPool> jit_arena_pool_; 774 std::unique_ptr<ArenaPool> arena_pool_; 775 // Special low 4gb pool for compiler linear alloc. We need ArtFields to be in low 4gb if we are 776 // compiling using a 32 bit image on a 64 bit compiler in case we resolve things in the image 777 // since the field arrays are int arrays in this case. 778 std::unique_ptr<ArenaPool> low_4gb_arena_pool_; 779 780 // Shared linear alloc for now. 781 std::unique_ptr<LinearAlloc> linear_alloc_; 782 783 // The number of spins that are done before thread suspension is used to forcibly inflate. 784 size_t max_spins_before_thin_lock_inflation_; 785 MonitorList* monitor_list_; 786 MonitorPool* monitor_pool_; 787 788 ThreadList* thread_list_; 789 790 InternTable* intern_table_; 791 792 ClassLinker* class_linker_; 793 794 SignalCatcher* signal_catcher_; 795 796 // If true, the runtime will connect to tombstoned via a socket to 797 // request an open file descriptor to write its traces to. 798 bool use_tombstoned_traces_; 799 800 // Location to which traces must be written on SIGQUIT. Only used if 801 // tombstoned_traces_ == false. 802 std::string stack_trace_file_; 803 804 std::unique_ptr<JavaVMExt> java_vm_; 805 806 std::unique_ptr<jit::Jit> jit_; 807 std::unique_ptr<jit::JitOptions> jit_options_; 808 809 // Fault message, printed when we get a SIGSEGV. 810 Mutex fault_message_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER; 811 std::string fault_message_ GUARDED_BY(fault_message_lock_); 812 813 // A non-zero value indicates that a thread has been created but not yet initialized. Guarded by 814 // the shutdown lock so that threads aren't born while we're shutting down. 815 size_t threads_being_born_ GUARDED_BY(Locks::runtime_shutdown_lock_); 816 817 // Waited upon until no threads are being born. 818 std::unique_ptr<ConditionVariable> shutdown_cond_ GUARDED_BY(Locks::runtime_shutdown_lock_); 819 820 // Set when runtime shutdown is past the point that new threads may attach. 821 bool shutting_down_ GUARDED_BY(Locks::runtime_shutdown_lock_); 822 823 // The runtime is starting to shutdown but is blocked waiting on shutdown_cond_. 824 bool shutting_down_started_ GUARDED_BY(Locks::runtime_shutdown_lock_); 825 826 bool started_; 827 828 // New flag added which tells us if the runtime has finished starting. If 829 // this flag is set then the Daemon threads are created and the class loader 830 // is created. This flag is needed for knowing if its safe to request CMS. 831 bool finished_starting_; 832 833 // Hooks supported by JNI_CreateJavaVM 834 jint (*vfprintf_)(FILE* stream, const char* format, va_list ap); 835 void (*exit_)(jint status); 836 void (*abort_)(); 837 838 bool stats_enabled_; 839 RuntimeStats stats_; 840 841 const bool is_running_on_memory_tool_; 842 843 std::unique_ptr<TraceConfig> trace_config_; 844 845 instrumentation::Instrumentation instrumentation_; 846 847 jobject main_thread_group_; 848 jobject system_thread_group_; 849 850 // As returned by ClassLoader.getSystemClassLoader(). 851 jobject system_class_loader_; 852 853 // If true, then we dump the GC cumulative timings on shutdown. 854 bool dump_gc_performance_on_shutdown_; 855 856 // Transactions used for pre-initializing classes at compilation time. 857 // Support nested transactions, maintain a list containing all transactions. Transactions are 858 // handled under a stack discipline. Because GC needs to go over all transactions, we choose list 859 // as substantial data structure instead of stack. 860 std::list<std::unique_ptr<Transaction>> preinitialization_transactions_; 861 862 // If kNone, verification is disabled. kEnable by default. 863 verifier::VerifyMode verify_; 864 865 // If true, the runtime may use dex files directly with the interpreter if an oat file is not 866 // available/usable. 867 bool allow_dex_file_fallback_; 868 869 // List of supported cpu abis. 870 std::vector<std::string> cpu_abilist_; 871 872 // Specifies target SDK version to allow workarounds for certain API levels. 873 int32_t target_sdk_version_; 874 875 // Implicit checks flags. 876 bool implicit_null_checks_; // NullPointer checks are implicit. 877 bool implicit_so_checks_; // StackOverflow checks are implicit. 878 bool implicit_suspend_checks_; // Thread suspension checks are implicit. 879 880 // Whether or not the sig chain (and implicitly the fault handler) should be 881 // disabled. Tools like dex2oat or patchoat don't need them. This enables 882 // building a statically link version of dex2oat. 883 bool no_sig_chain_; 884 885 // Force the use of native bridge even if the app ISA matches the runtime ISA. 886 bool force_native_bridge_; 887 888 // Whether or not a native bridge has been loaded. 889 // 890 // The native bridge allows running native code compiled for a foreign ISA. The way it works is, 891 // if standard dlopen fails to load native library associated with native activity, it calls to 892 // the native bridge to load it and then gets the trampoline for the entry to native activity. 893 // 894 // The option 'native_bridge_library_filename' specifies the name of the native bridge. 895 // When non-empty the native bridge will be loaded from the given file. An empty value means 896 // that there's no native bridge. 897 bool is_native_bridge_loaded_; 898 899 // Whether we are running under native debugger. 900 bool is_native_debuggable_; 901 902 // Whether Java code needs to be debuggable. 903 bool is_java_debuggable_; 904 905 // The maximum number of failed boots we allow before pruning the dalvik cache 906 // and trying again. This option is only inspected when we're running as a 907 // zygote. 908 uint32_t zygote_max_failed_boots_; 909 910 // Enable experimental opcodes that aren't fully specified yet. The intent is to 911 // eventually publish them as public-usable opcodes, but they aren't ready yet. 912 // 913 // Experimental opcodes should not be used by other production code. 914 ExperimentalFlags experimental_flags_; 915 916 // Contains the build fingerprint, if given as a parameter. 917 std::string fingerprint_; 918 919 // Oat file manager, keeps track of what oat files are open. 920 OatFileManager* oat_file_manager_; 921 922 // Whether or not we are on a low RAM device. 923 bool is_low_memory_mode_; 924 925 // Whether or not we use MADV_RANDOM on files that are thought to have random access patterns. 926 // This is beneficial for low RAM devices since it reduces page cache thrashing. 927 bool madvise_random_access_; 928 929 // Whether the application should run in safe mode, that is, interpreter only. 930 bool safe_mode_; 931 932 // Whether threads should dump their native stack on SIGQUIT. 933 bool dump_native_stack_on_sig_quit_; 934 935 // Whether the dalvik cache was pruned when initializing the runtime. 936 bool pruned_dalvik_cache_; 937 938 // Whether or not we currently care about pause times. 939 ProcessState process_state_; 940 941 // Whether zygote code is in a section that should not start threads. 942 bool zygote_no_threads_; 943 944 // Saved environment. 945 class EnvSnapshot { 946 public: 947 EnvSnapshot() = default; 948 void TakeSnapshot(); 949 char** GetSnapshot() const; 950 951 private: 952 std::unique_ptr<char*[]> c_env_vector_; 953 std::vector<std::unique_ptr<std::string>> name_value_pairs_; 954 955 DISALLOW_COPY_AND_ASSIGN(EnvSnapshot); 956 } env_snapshot_; 957 958 // Generic system-weak holders. 959 std::vector<gc::AbstractSystemWeakHolder*> system_weak_holders_; 960 961 std::unique_ptr<RuntimeCallbacks> callbacks_; 962 963 std::atomic<uint32_t> deoptimization_counts_[ 964 static_cast<uint32_t>(DeoptimizationKind::kLast) + 1]; 965 966 std::unique_ptr<MemMap> protected_fault_page_; 967 968 DISALLOW_COPY_AND_ASSIGN(Runtime); 969}; 970 971} // namespace art 972 973#endif // ART_RUNTIME_RUNTIME_H_ 974