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* Copyright (C) 2011 The Android Open Source Project
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <jni.h>
#include <stdio.h>
#include <iosfwd>
#include <set>
#include <string>
#include <utility>
#include <memory>
#include <vector>
#include "arch/instruction_set.h"
#include "base/macros.h"
#include "base/mutex.h"
#include "deoptimization_kind.h"
#include "dex/dex_file_types.h"
#include "experimental_flags.h"
#include "gc_root.h"
#include "instrumentation.h"
#include "jdwp_provider.h"
#include "obj_ptr.h"
#include "offsets.h"
#include "process_state.h"
#include "quick/quick_method_frame_info.h"
#include "runtime_stats.h"
namespace art {
namespace gc {
class AbstractSystemWeakHolder;
class Heap;
} // namespace gc
namespace hiddenapi {
enum class EnforcementPolicy;
} // namespace hiddenapi
namespace jit {
class Jit;
class JitOptions;
} // namespace jit
namespace mirror {
class Array;
class ClassLoader;
class DexCache;
template<class T> class ObjectArray;
template<class T> class PrimitiveArray;
typedef PrimitiveArray<int8_t> ByteArray;
class String;
class Throwable;
} // namespace mirror
namespace ti {
class Agent;
class AgentSpec;
} // namespace ti
namespace verifier {
class MethodVerifier;
enum class VerifyMode : int8_t;
} // namespace verifier
class ArenaPool;
class ArtMethod;
enum class CalleeSaveType: uint32_t;
class ClassLinker;
class CompilerCallbacks;
class DexFile;
class InternTable;
class IsMarkedVisitor;
class JavaVMExt;
class LinearAlloc;
class MemMap;
class MonitorList;
class MonitorPool;
class NullPointerHandler;
class OatFileManager;
class Plugin;
struct RuntimeArgumentMap;
class RuntimeCallbacks;
class SignalCatcher;
class StackOverflowHandler;
class SuspensionHandler;
class ThreadList;
class Trace;
struct TraceConfig;
class Transaction;
typedef std::vector<std::pair<std::string, const void*>> RuntimeOptions;
class Runtime {
// Parse raw runtime options.
static bool ParseOptions(const RuntimeOptions& raw_options,
bool ignore_unrecognized,
RuntimeArgumentMap* runtime_options);
// Creates and initializes a new runtime.
static bool Create(RuntimeArgumentMap&& runtime_options)
SHARED_TRYLOCK_FUNCTION(true, Locks::mutator_lock_);
// Creates and initializes a new runtime.
static bool Create(const RuntimeOptions& raw_options, bool ignore_unrecognized)
SHARED_TRYLOCK_FUNCTION(true, Locks::mutator_lock_);
// IsAotCompiler for compilers that don't have a running runtime. Only dex2oat currently.
bool IsAotCompiler() const {
return !UseJitCompilation() && IsCompiler();
// IsCompiler is any runtime which has a running compiler, either dex2oat or JIT.
bool IsCompiler() const {
return compiler_callbacks_ != nullptr;
// If a compiler, are we compiling a boot image?
bool IsCompilingBootImage() const;
bool CanRelocate() const;
bool ShouldRelocate() const {
return must_relocate_ && CanRelocate();
bool MustRelocateIfPossible() const {
return must_relocate_;
bool IsDex2OatEnabled() const {
return dex2oat_enabled_ && IsImageDex2OatEnabled();
bool IsImageDex2OatEnabled() const {
return image_dex2oat_enabled_;
CompilerCallbacks* GetCompilerCallbacks() {
return compiler_callbacks_;
void SetCompilerCallbacks(CompilerCallbacks* callbacks) {
CHECK(callbacks != nullptr);
compiler_callbacks_ = callbacks;
bool IsZygote() const {
return is_zygote_;
bool IsExplicitGcDisabled() const {
return is_explicit_gc_disabled_;
std::string GetCompilerExecutable() const;
std::string GetPatchoatExecutable() const;
const std::vector<std::string>& GetCompilerOptions() const {
return compiler_options_;
void AddCompilerOption(const std::string& option) {
const std::vector<std::string>& GetImageCompilerOptions() const {
return image_compiler_options_;
const std::string& GetImageLocation() const {
return image_location_;
// Starts a runtime, which may cause threads to be started and code to run.
bool Start() UNLOCK_FUNCTION(Locks::mutator_lock_);
bool IsShuttingDown(Thread* self);
bool IsShuttingDownLocked() const REQUIRES(Locks::runtime_shutdown_lock_) {
return shutting_down_;
size_t NumberOfThreadsBeingBorn() const REQUIRES(Locks::runtime_shutdown_lock_) {
return threads_being_born_;
void StartThreadBirth() REQUIRES(Locks::runtime_shutdown_lock_) {
void EndThreadBirth() REQUIRES(Locks::runtime_shutdown_lock_);
bool IsStarted() const {
return started_;
bool IsFinishedStarting() const {
return finished_starting_;
static Runtime* Current() {
return instance_;
// Aborts semi-cleanly. Used in the implementation of LOG(FATAL), which most
// callers should prefer.
NO_RETURN static void Abort(const char* msg) REQUIRES(!Locks::abort_lock_);
// Returns the "main" ThreadGroup, used when attaching user threads.
jobject GetMainThreadGroup() const;
// Returns the "system" ThreadGroup, used when attaching our internal threads.
jobject GetSystemThreadGroup() const;
// Returns the system ClassLoader which represents the CLASSPATH.
jobject GetSystemClassLoader() const;
// Attaches the calling native thread to the runtime.
bool AttachCurrentThread(const char* thread_name, bool as_daemon, jobject thread_group,
bool create_peer);
void CallExitHook(jint status);
// Detaches the current native thread from the runtime.
void DetachCurrentThread() REQUIRES(!Locks::mutator_lock_);
void DumpDeoptimizations(std::ostream& os);
void DumpForSigQuit(std::ostream& os);
void DumpLockHolders(std::ostream& os);
const std::string& GetBootClassPathString() const {
return boot_class_path_string_;
const std::string& GetClassPathString() const {
return class_path_string_;
ClassLinker* GetClassLinker() const {
return class_linker_;
size_t GetDefaultStackSize() const {
return default_stack_size_;
gc::Heap* GetHeap() const {
return heap_;
InternTable* GetInternTable() const {
DCHECK(intern_table_ != nullptr);
return intern_table_;
JavaVMExt* GetJavaVM() const {
return java_vm_.get();
size_t GetMaxSpinsBeforeThinLockInflation() const {
return max_spins_before_thin_lock_inflation_;
MonitorList* GetMonitorList() const {
return monitor_list_;
MonitorPool* GetMonitorPool() const {
return monitor_pool_;
// Is the given object the special object used to mark a cleared JNI weak global?
bool IsClearedJniWeakGlobal(ObjPtr<mirror::Object> obj) REQUIRES_SHARED(Locks::mutator_lock_);
// Get the special object used to mark a cleared JNI weak global.
mirror::Object* GetClearedJniWeakGlobal() REQUIRES_SHARED(Locks::mutator_lock_);
mirror::Throwable* GetPreAllocatedOutOfMemoryErrorWhenThrowingException()
mirror::Throwable* GetPreAllocatedOutOfMemoryErrorWhenThrowingOOME()
mirror::Throwable* GetPreAllocatedOutOfMemoryErrorWhenHandlingStackOverflow()
mirror::Throwable* GetPreAllocatedNoClassDefFoundError()
const std::vector<std::string>& GetProperties() const {
return properties_;
ThreadList* GetThreadList() const {
return thread_list_;
static const char* GetVersion() {
return "2.1.0";
bool IsMethodHandlesEnabled() const {
return true;
void DisallowNewSystemWeaks() REQUIRES_SHARED(Locks::mutator_lock_);
void AllowNewSystemWeaks() REQUIRES_SHARED(Locks::mutator_lock_);
// broadcast_for_checkpoint is true when we broadcast for making blocking threads to respond to
// checkpoint requests. It's false when we broadcast to unblock blocking threads after system weak
// access is reenabled.
void BroadcastForNewSystemWeaks(bool broadcast_for_checkpoint = false);
// Visit all the roots. If only_dirty is true then non-dirty roots won't be visited. If
// clean_dirty is true then dirty roots will be marked as non-dirty after visiting.
void VisitRoots(RootVisitor* visitor, VisitRootFlags flags = kVisitRootFlagAllRoots)
REQUIRES(!Locks::classlinker_classes_lock_, !Locks::trace_lock_)
// Visit image roots, only used for hprof since the GC uses the image space mod union table
// instead.
void VisitImageRoots(RootVisitor* visitor) REQUIRES_SHARED(Locks::mutator_lock_);
// Visit all of the roots we can safely visit concurrently.
void VisitConcurrentRoots(RootVisitor* visitor,
VisitRootFlags flags = kVisitRootFlagAllRoots)
REQUIRES(!Locks::classlinker_classes_lock_, !Locks::trace_lock_)
// Visit all of the non thread roots, we can do this with mutators unpaused.
void VisitNonThreadRoots(RootVisitor* visitor)
void VisitTransactionRoots(RootVisitor* visitor)
// Sweep system weaks, the system weak is deleted if the visitor return null. Otherwise, the
// system weak is updated to be the visitor's returned value.
void SweepSystemWeaks(IsMarkedVisitor* visitor)
// Returns a special method that calls into a trampoline for runtime method resolution
ArtMethod* GetResolutionMethod();
bool HasResolutionMethod() const {
return resolution_method_ != nullptr;
void SetResolutionMethod(ArtMethod* method) REQUIRES_SHARED(Locks::mutator_lock_);
void ClearResolutionMethod() {
resolution_method_ = nullptr;
ArtMethod* CreateResolutionMethod() REQUIRES_SHARED(Locks::mutator_lock_);
// Returns a special method that calls into a trampoline for runtime imt conflicts.
ArtMethod* GetImtConflictMethod();
ArtMethod* GetImtUnimplementedMethod();
bool HasImtConflictMethod() const {
return imt_conflict_method_ != nullptr;
void ClearImtConflictMethod() {
imt_conflict_method_ = nullptr;
void FixupConflictTables();
void SetImtConflictMethod(ArtMethod* method) REQUIRES_SHARED(Locks::mutator_lock_);
void SetImtUnimplementedMethod(ArtMethod* method) REQUIRES_SHARED(Locks::mutator_lock_);
ArtMethod* CreateImtConflictMethod(LinearAlloc* linear_alloc)
void ClearImtUnimplementedMethod() {
imt_unimplemented_method_ = nullptr;
bool HasCalleeSaveMethod(CalleeSaveType type) const {
return callee_save_methods_[static_cast<size_t>(type)] != 0u;
ArtMethod* GetCalleeSaveMethod(CalleeSaveType type)
ArtMethod* GetCalleeSaveMethodUnchecked(CalleeSaveType type)
QuickMethodFrameInfo GetRuntimeMethodFrameInfo(ArtMethod* method)
static size_t GetCalleeSaveMethodOffset(CalleeSaveType type) {
return OFFSETOF_MEMBER(Runtime, callee_save_methods_[static_cast<size_t>(type)]);
InstructionSet GetInstructionSet() const {
return instruction_set_;
void SetInstructionSet(InstructionSet instruction_set);
void ClearInstructionSet();
void SetCalleeSaveMethod(ArtMethod* method, CalleeSaveType type);
void ClearCalleeSaveMethods();
ArtMethod* CreateCalleeSaveMethod() REQUIRES_SHARED(Locks::mutator_lock_);
int32_t GetStat(int kind);
RuntimeStats* GetStats() {
return &stats_;
bool HasStatsEnabled() const {
return stats_enabled_;
void ResetStats(int kinds);
void SetStatsEnabled(bool new_state)
REQUIRES(!Locks::instrument_entrypoints_lock_, !Locks::mutator_lock_);
enum class NativeBridgeAction { // private
jit::Jit* GetJit() const {
return jit_.get();
// Returns true if JIT compilations are enabled. GetJit() will be not null in this case.
bool UseJitCompilation() const;
void PreZygoteFork();
void InitNonZygoteOrPostFork(
JNIEnv* env,
bool is_system_server,
NativeBridgeAction action,
const char* isa,
bool profile_system_server = false);
const instrumentation::Instrumentation* GetInstrumentation() const {
return &instrumentation_;
instrumentation::Instrumentation* GetInstrumentation() {
return &instrumentation_;
void RegisterAppInfo(const std::vector<std::string>& code_paths,
const std::string& profile_output_filename);
// Transaction support.
bool IsActiveTransaction() const;
void EnterTransactionMode();
void EnterTransactionMode(bool strict, mirror::Class* root);
void ExitTransactionMode();
void RollbackAllTransactions() REQUIRES_SHARED(Locks::mutator_lock_);
// Transaction rollback and exit transaction are always done together, it's convenience to
// do them in one function.
void RollbackAndExitTransactionMode() REQUIRES_SHARED(Locks::mutator_lock_);
bool IsTransactionAborted() const;
const std::unique_ptr<Transaction>& GetTransaction() const;
bool IsActiveStrictTransactionMode() const;
void AbortTransactionAndThrowAbortError(Thread* self, const std::string& abort_message)
void ThrowTransactionAbortError(Thread* self)
void RecordWriteFieldBoolean(mirror::Object* obj, MemberOffset field_offset, uint8_t value,
bool is_volatile) const;
void RecordWriteFieldByte(mirror::Object* obj, MemberOffset field_offset, int8_t value,
bool is_volatile) const;
void RecordWriteFieldChar(mirror::Object* obj, MemberOffset field_offset, uint16_t value,
bool is_volatile) const;
void RecordWriteFieldShort(mirror::Object* obj, MemberOffset field_offset, int16_t value,
bool is_volatile) const;
void RecordWriteField32(mirror::Object* obj, MemberOffset field_offset, uint32_t value,
bool is_volatile) const;
void RecordWriteField64(mirror::Object* obj, MemberOffset field_offset, uint64_t value,
bool is_volatile) const;
void RecordWriteFieldReference(mirror::Object* obj,
MemberOffset field_offset,
ObjPtr<mirror::Object> value,
bool is_volatile) const
void RecordWriteArray(mirror::Array* array, size_t index, uint64_t value) const
void RecordStrongStringInsertion(ObjPtr<mirror::String> s) const
void RecordWeakStringInsertion(ObjPtr<mirror::String> s) const
void RecordStrongStringRemoval(ObjPtr<mirror::String> s) const
void RecordWeakStringRemoval(ObjPtr<mirror::String> s) const
void RecordResolveString(ObjPtr<mirror::DexCache> dex_cache, dex::StringIndex string_idx) const
void SetFaultMessage(const std::string& message) REQUIRES(!fault_message_lock_);
// Only read by the signal handler, NO_THREAD_SAFETY_ANALYSIS to prevent lock order violations
// with the unexpected_signal_lock_.
const std::string& GetFaultMessage() NO_THREAD_SAFETY_ANALYSIS {
return fault_message_;
void AddCurrentRuntimeFeaturesAsDex2OatArguments(std::vector<std::string>* arg_vector) const;
bool ExplicitStackOverflowChecks() const {
return !implicit_so_checks_;
void DisableVerifier();
bool IsVerificationEnabled() const;
bool IsVerificationSoftFail() const;
void SetHiddenApiEnforcementPolicy(hiddenapi::EnforcementPolicy policy) {
hidden_api_policy_ = policy;
hiddenapi::EnforcementPolicy GetHiddenApiEnforcementPolicy() const {
return hidden_api_policy_;
void SetPendingHiddenApiWarning(bool value) {
pending_hidden_api_warning_ = value;
void SetHiddenApiExemptions(const std::vector<std::string>& exemptions) {
hidden_api_exemptions_ = exemptions;
const std::vector<std::string>& GetHiddenApiExemptions() {
return hidden_api_exemptions_;
bool HasPendingHiddenApiWarning() const {
return pending_hidden_api_warning_;
void SetDedupeHiddenApiWarnings(bool value) {
dedupe_hidden_api_warnings_ = value;
bool ShouldDedupeHiddenApiWarnings() {
return dedupe_hidden_api_warnings_;
void AlwaysSetHiddenApiWarningFlag() {
always_set_hidden_api_warning_flag_ = true;
bool ShouldAlwaysSetHiddenApiWarningFlag() const {
return always_set_hidden_api_warning_flag_;
void SetHiddenApiEventLogSampleRate(uint32_t rate) {
hidden_api_access_event_log_rate_ = rate;
uint32_t GetHiddenApiEventLogSampleRate() const {
return hidden_api_access_event_log_rate_;
bool IsDexFileFallbackEnabled() const {
return allow_dex_file_fallback_;
const std::vector<std::string>& GetCpuAbilist() const {
return cpu_abilist_;
bool IsRunningOnMemoryTool() const {
return is_running_on_memory_tool_;
void SetTargetSdkVersion(int32_t version) {
target_sdk_version_ = version;
int32_t GetTargetSdkVersion() const {
return target_sdk_version_;
uint32_t GetZygoteMaxFailedBoots() const {
return zygote_max_failed_boots_;
bool AreExperimentalFlagsEnabled(ExperimentalFlags flags) {
return (experimental_flags_ & flags) != ExperimentalFlags::kNone;
// Create the JIT and instrumentation and code cache.
void CreateJit();
ArenaPool* GetArenaPool() {
return arena_pool_.get();
ArenaPool* GetJitArenaPool() {
return jit_arena_pool_.get();
const ArenaPool* GetArenaPool() const {
return arena_pool_.get();
void ReclaimArenaPoolMemory();
LinearAlloc* GetLinearAlloc() {
return linear_alloc_.get();
jit::JitOptions* GetJITOptions() {
return jit_options_.get();
bool IsJavaDebuggable() const {
return is_java_debuggable_;
void SetJavaDebuggable(bool value);
// Deoptimize the boot image, called for Java debuggable apps.
void DeoptimizeBootImage();
bool IsNativeDebuggable() const {
return is_native_debuggable_;
void SetNativeDebuggable(bool value) {
is_native_debuggable_ = value;
bool AreAsyncExceptionsThrown() const {
return async_exceptions_thrown_;
void SetAsyncExceptionsThrown() {
async_exceptions_thrown_ = true;
// Returns the build fingerprint, if set. Otherwise an empty string is returned.
std::string GetFingerprint() {
return fingerprint_;
// Called from class linker.
void SetSentinel(mirror::Object* sentinel) REQUIRES_SHARED(Locks::mutator_lock_);
// Create a normal LinearAlloc or low 4gb version if we are 64 bit AOT compiler.
LinearAlloc* CreateLinearAlloc();
OatFileManager& GetOatFileManager() const {
DCHECK(oat_file_manager_ != nullptr);
return *oat_file_manager_;
double GetHashTableMinLoadFactor() const;
double GetHashTableMaxLoadFactor() const;
void SetSafeMode(bool mode) {
safe_mode_ = mode;
bool GetDumpNativeStackOnSigQuit() const {
return dump_native_stack_on_sig_quit_;
bool GetPrunedDalvikCache() const {
return pruned_dalvik_cache_;
void SetPrunedDalvikCache(bool pruned) {
pruned_dalvik_cache_ = pruned;
void UpdateProcessState(ProcessState process_state);
// Returns true if we currently care about long mutator pause.
bool InJankPerceptibleProcessState() const {
return process_state_ == kProcessStateJankPerceptible;
void RegisterSensitiveThread() const;
void SetZygoteNoThreadSection(bool val) {
zygote_no_threads_ = val;
bool IsZygoteNoThreadSection() const {
return zygote_no_threads_;
// Returns if the code can be deoptimized asynchronously. Code may be compiled with some
// optimization that makes it impossible to deoptimize.
bool IsAsyncDeoptimizeable(uintptr_t code) const REQUIRES_SHARED(Locks::mutator_lock_);
// Returns a saved copy of the environment (getenv/setenv values).
// Used by Fork to protect against overwriting LD_LIBRARY_PATH, etc.
char** GetEnvSnapshot() const {
return env_snapshot_.GetSnapshot();
void AddSystemWeakHolder(gc::AbstractSystemWeakHolder* holder);
void RemoveSystemWeakHolder(gc::AbstractSystemWeakHolder* holder);
void AttachAgent(JNIEnv* env, const std::string& agent_arg, jobject class_loader);
const std::list<std::unique_ptr<ti::Agent>>& GetAgents() const {
return agents_;
RuntimeCallbacks* GetRuntimeCallbacks();
bool HasLoadedPlugins() const {
return !plugins_.empty();
void InitThreadGroups(Thread* self);
void SetDumpGCPerformanceOnShutdown(bool value) {
dump_gc_performance_on_shutdown_ = value;
void IncrementDeoptimizationCount(DeoptimizationKind kind) {
DCHECK_LE(kind, DeoptimizationKind::kLast);
uint32_t GetNumberOfDeoptimizations() const {
uint32_t result = 0;
for (size_t i = 0; i <= static_cast<size_t>(DeoptimizationKind::kLast); ++i) {
result += deoptimization_counts_[i];
return result;
// Whether or not we use MADV_RANDOM on files that are thought to have random access patterns.
// This is beneficial for low RAM devices since it reduces page cache thrashing.
bool MAdviseRandomAccess() const {
return madvise_random_access_;
const std::string& GetJdwpOptions() {
return jdwp_options_;
JdwpProvider GetJdwpProvider() const {
return jdwp_provider_;
static constexpr int32_t kUnsetSdkVersion = 0u;
static void InitPlatformSignalHandlers();
void BlockSignals();
bool Init(RuntimeArgumentMap&& runtime_options)
SHARED_TRYLOCK_FUNCTION(true, Locks::mutator_lock_);
void InitNativeMethods() REQUIRES(!Locks::mutator_lock_);
void RegisterRuntimeNativeMethods(JNIEnv* env);
void StartDaemonThreads();
void StartSignalCatcher();
void MaybeSaveJitProfilingInfo();
// Visit all of the thread roots.
void VisitThreadRoots(RootVisitor* visitor, VisitRootFlags flags)
// Visit all other roots which must be done with mutators suspended.
void VisitNonConcurrentRoots(RootVisitor* visitor, VisitRootFlags flags)
// Constant roots are the roots which never change after the runtime is initialized, they only
// need to be visited once per GC cycle.
void VisitConstantRoots(RootVisitor* visitor)
// A pointer to the active runtime or null.
static Runtime* instance_;
// NOTE: these must match the gc::ProcessState values as they come directly from the framework.
static constexpr int kProfileForground = 0;
static constexpr int kProfileBackground = 1;
static constexpr uint32_t kCalleeSaveSize = 6u;
// 64 bit so that we can share the same asm offsets for both 32 and 64 bits.
uint64_t callee_save_methods_[kCalleeSaveSize];
// Pre-allocated exceptions (see Runtime::Init).
GcRoot<mirror::Throwable> pre_allocated_OutOfMemoryError_when_throwing_exception_;
GcRoot<mirror::Throwable> pre_allocated_OutOfMemoryError_when_throwing_oome_;
GcRoot<mirror::Throwable> pre_allocated_OutOfMemoryError_when_handling_stack_overflow_;
GcRoot<mirror::Throwable> pre_allocated_NoClassDefFoundError_;
ArtMethod* resolution_method_;
ArtMethod* imt_conflict_method_;
// Unresolved method has the same behavior as the conflict method, it is used by the class linker
// for differentiating between unfilled imt slots vs conflict slots in superclasses.
ArtMethod* imt_unimplemented_method_;
// Special sentinel object used to invalid conditions in JNI (cleared weak references) and
// JDWP (invalid references).
GcRoot<mirror::Object> sentinel_;
InstructionSet instruction_set_;
CompilerCallbacks* compiler_callbacks_;
bool is_zygote_;
bool must_relocate_;
bool is_concurrent_gc_enabled_;
bool is_explicit_gc_disabled_;
bool dex2oat_enabled_;
bool image_dex2oat_enabled_;
std::string compiler_executable_;
std::string patchoat_executable_;
std::vector<std::string> compiler_options_;
std::vector<std::string> image_compiler_options_;
std::string image_location_;
std::string boot_class_path_string_;
std::string class_path_string_;
std::vector<std::string> properties_;
std::list<ti::AgentSpec> agent_specs_;
std::list<std::unique_ptr<ti::Agent>> agents_;
std::vector<Plugin> plugins_;
// The default stack size for managed threads created by the runtime.
size_t default_stack_size_;
gc::Heap* heap_;
std::unique_ptr<ArenaPool> jit_arena_pool_;
std::unique_ptr<ArenaPool> arena_pool_;
// Special low 4gb pool for compiler linear alloc. We need ArtFields to be in low 4gb if we are
// compiling using a 32 bit image on a 64 bit compiler in case we resolve things in the image
// since the field arrays are int arrays in this case.
std::unique_ptr<ArenaPool> low_4gb_arena_pool_;
// Shared linear alloc for now.
std::unique_ptr<LinearAlloc> linear_alloc_;
// The number of spins that are done before thread suspension is used to forcibly inflate.
size_t max_spins_before_thin_lock_inflation_;
MonitorList* monitor_list_;
MonitorPool* monitor_pool_;
ThreadList* thread_list_;
InternTable* intern_table_;
ClassLinker* class_linker_;
SignalCatcher* signal_catcher_;
std::unique_ptr<JavaVMExt> java_vm_;
std::unique_ptr<jit::Jit> jit_;
std::unique_ptr<jit::JitOptions> jit_options_;
// Fault message, printed when we get a SIGSEGV.
Mutex fault_message_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
std::string fault_message_ GUARDED_BY(fault_message_lock_);
// A non-zero value indicates that a thread has been created but not yet initialized. Guarded by
// the shutdown lock so that threads aren't born while we're shutting down.
size_t threads_being_born_ GUARDED_BY(Locks::runtime_shutdown_lock_);
// Waited upon until no threads are being born.
std::unique_ptr<ConditionVariable> shutdown_cond_ GUARDED_BY(Locks::runtime_shutdown_lock_);
// Set when runtime shutdown is past the point that new threads may attach.
bool shutting_down_ GUARDED_BY(Locks::runtime_shutdown_lock_);
// The runtime is starting to shutdown but is blocked waiting on shutdown_cond_.
bool shutting_down_started_ GUARDED_BY(Locks::runtime_shutdown_lock_);
bool started_;
// New flag added which tells us if the runtime has finished starting. If
// this flag is set then the Daemon threads are created and the class loader
// is created. This flag is needed for knowing if its safe to request CMS.
bool finished_starting_;
// Hooks supported by JNI_CreateJavaVM
jint (*vfprintf_)(FILE* stream, const char* format, va_list ap);
void (*exit_)(jint status);
void (*abort_)();
bool stats_enabled_;
RuntimeStats stats_;
const bool is_running_on_memory_tool_;
std::unique_ptr<TraceConfig> trace_config_;
instrumentation::Instrumentation instrumentation_;
jobject main_thread_group_;
jobject system_thread_group_;
// As returned by ClassLoader.getSystemClassLoader().
jobject system_class_loader_;
// If true, then we dump the GC cumulative timings on shutdown.
bool dump_gc_performance_on_shutdown_;
// Transactions used for pre-initializing classes at compilation time.
// Support nested transactions, maintain a list containing all transactions. Transactions are
// handled under a stack discipline. Because GC needs to go over all transactions, we choose list
// as substantial data structure instead of stack.
std::list<std::unique_ptr<Transaction>> preinitialization_transactions_;
// If kNone, verification is disabled. kEnable by default.
verifier::VerifyMode verify_;
// If true, the runtime may use dex files directly with the interpreter if an oat file is not
// available/usable.
bool allow_dex_file_fallback_;
// List of supported cpu abis.
std::vector<std::string> cpu_abilist_;
// Specifies target SDK version to allow workarounds for certain API levels.
int32_t target_sdk_version_;
// Implicit checks flags.
bool implicit_null_checks_; // NullPointer checks are implicit.
bool implicit_so_checks_; // StackOverflow checks are implicit.
bool implicit_suspend_checks_; // Thread suspension checks are implicit.
// Whether or not the sig chain (and implicitly the fault handler) should be
// disabled. Tools like dex2oat or patchoat don't need them. This enables
// building a statically link version of dex2oat.
bool no_sig_chain_;
// Force the use of native bridge even if the app ISA matches the runtime ISA.
bool force_native_bridge_;
// Whether or not a native bridge has been loaded.
// The native bridge allows running native code compiled for a foreign ISA. The way it works is,
// if standard dlopen fails to load native library associated with native activity, it calls to
// the native bridge to load it and then gets the trampoline for the entry to native activity.
// The option 'native_bridge_library_filename' specifies the name of the native bridge.
// When non-empty the native bridge will be loaded from the given file. An empty value means
// that there's no native bridge.
bool is_native_bridge_loaded_;
// Whether we are running under native debugger.
bool is_native_debuggable_;
// whether or not any async exceptions have ever been thrown. This is used to speed up the
// MterpShouldSwitchInterpreters function.
bool async_exceptions_thrown_;
// Whether Java code needs to be debuggable.
bool is_java_debuggable_;
// The maximum number of failed boots we allow before pruning the dalvik cache
// and trying again. This option is only inspected when we're running as a
// zygote.
uint32_t zygote_max_failed_boots_;
// Enable experimental opcodes that aren't fully specified yet. The intent is to
// eventually publish them as public-usable opcodes, but they aren't ready yet.
// Experimental opcodes should not be used by other production code.
ExperimentalFlags experimental_flags_;
// Contains the build fingerprint, if given as a parameter.
std::string fingerprint_;
// Oat file manager, keeps track of what oat files are open.
OatFileManager* oat_file_manager_;
// Whether or not we are on a low RAM device.
bool is_low_memory_mode_;
// Whether or not we use MADV_RANDOM on files that are thought to have random access patterns.
// This is beneficial for low RAM devices since it reduces page cache thrashing.
bool madvise_random_access_;
// Whether the application should run in safe mode, that is, interpreter only.
bool safe_mode_;
// Whether access checks on hidden API should be performed.
hiddenapi::EnforcementPolicy hidden_api_policy_;
// List of signature prefixes of methods that have been removed from the blacklist, and treated
// as if whitelisted.
std::vector<std::string> hidden_api_exemptions_;
// Whether the application has used an API which is not restricted but we
// should issue a warning about it.
bool pending_hidden_api_warning_;
// Do not warn about the same hidden API access violation twice.
// This is only used for testing.
bool dedupe_hidden_api_warnings_;
// Hidden API can print warnings into the log and/or set a flag read by the
// framework to show a UI warning. If this flag is set, always set the flag
// when there is a warning. This is only used for testing.
bool always_set_hidden_api_warning_flag_;
// How often to log hidden API access to the event log. An integer between 0 (never)
// and 0x10000 (always).
uint32_t hidden_api_access_event_log_rate_;
// Whether threads should dump their native stack on SIGQUIT.
bool dump_native_stack_on_sig_quit_;
// Whether the dalvik cache was pruned when initializing the runtime.
bool pruned_dalvik_cache_;
// Whether or not we currently care about pause times.
ProcessState process_state_;
// Whether zygote code is in a section that should not start threads.
bool zygote_no_threads_;
// The string containing requested jdwp options
std::string jdwp_options_;
// The jdwp provider we were configured with.
JdwpProvider jdwp_provider_;
// Saved environment.
class EnvSnapshot {
EnvSnapshot() = default;
void TakeSnapshot();
char** GetSnapshot() const;
std::unique_ptr<char*[]> c_env_vector_;
std::vector<std::unique_ptr<std::string>> name_value_pairs_;
} env_snapshot_;
// Generic system-weak holders.
std::vector<gc::AbstractSystemWeakHolder*> system_weak_holders_;
std::unique_ptr<RuntimeCallbacks> callbacks_;
std::atomic<uint32_t> deoptimization_counts_[
static_cast<uint32_t>(DeoptimizationKind::kLast) + 1];
std::unique_ptr<MemMap> protected_fault_page_;
} // namespace art