| // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| #include "vm/isolate.h" |
| |
| #include "include/dart_api.h" |
| #include "platform/assert.h" |
| #include "lib/mirrors.h" |
| #include "vm/compiler_stats.h" |
| #include "vm/dart_api_state.h" |
| #include "vm/dart_entry.h" |
| #include "vm/debugger.h" |
| #include "vm/debuginfo.h" |
| #include "vm/heap.h" |
| #include "vm/message_handler.h" |
| #include "vm/object_store.h" |
| #include "vm/parser.h" |
| #include "vm/port.h" |
| #include "vm/random.h" |
| #include "vm/stack_frame.h" |
| #include "vm/stub_code.h" |
| #include "vm/symbols.h" |
| #include "vm/thread.h" |
| #include "vm/timer.h" |
| #include "vm/visitor.h" |
| |
| namespace dart { |
| |
| DEFINE_FLAG(bool, report_usage_count, false, |
| "Track function usage and report."); |
| DEFINE_FLAG(bool, trace_isolates, false, |
| "Trace isolate creation and shut down."); |
| DECLARE_FLAG(bool, generate_gdb_symbols); |
| |
| |
| class IsolateMessageHandler : public MessageHandler { |
| public: |
| explicit IsolateMessageHandler(Isolate* isolate); |
| ~IsolateMessageHandler(); |
| |
| const char* name() const; |
| void MessageNotify(Message::Priority priority); |
| bool HandleMessage(Message* message); |
| |
| #if defined(DEBUG) |
| // Check that it is safe to access this handler. |
| void CheckAccess(); |
| #endif |
| bool IsCurrentIsolate() const; |
| virtual Isolate* GetIsolate() const { return isolate_; } |
| |
| private: |
| Isolate* isolate_; |
| }; |
| |
| |
| IsolateMessageHandler::IsolateMessageHandler(Isolate* isolate) |
| : isolate_(isolate) { |
| } |
| |
| |
| IsolateMessageHandler::~IsolateMessageHandler() { |
| } |
| |
| const char* IsolateMessageHandler::name() const { |
| return isolate_->name(); |
| } |
| |
| |
| void IsolateMessageHandler::MessageNotify(Message::Priority priority) { |
| if (priority >= Message::kOOBPriority) { |
| // Handle out of band messages even if the isolate is busy. |
| isolate_->ScheduleInterrupts(Isolate::kMessageInterrupt); |
| } |
| Dart_MessageNotifyCallback callback = isolate_->message_notify_callback(); |
| if (callback) { |
| // Allow the embedder to handle message notification. |
| (*callback)(Api::CastIsolate(isolate_)); |
| } |
| } |
| |
| |
| bool IsolateMessageHandler::HandleMessage(Message* message) { |
| StartIsolateScope start_scope(isolate_); |
| StackZone zone(isolate_); |
| HandleScope handle_scope(isolate_); |
| |
| // Parse the message. |
| SnapshotReader reader(message->data(), message->len(), |
| Snapshot::kMessage, Isolate::Current()); |
| const Object& msg_obj = Object::Handle(reader.ReadObject()); |
| if (!msg_obj.IsNull() && !msg_obj.IsInstance()) { |
| // TODO(turnidge): We need to decide what an isolate does with |
| // malformed messages. If they (eventually) come from a remote |
| // machine, then it might make sense to drop the message entirely. |
| // In the case that the message originated locally, which is |
| // always true for now, then this should never occur. |
| UNREACHABLE(); |
| } |
| |
| Instance& msg = Instance::Handle(); |
| msg ^= msg_obj.raw(); // Can't use Instance::Cast because may be null. |
| |
| if (message->IsOOB()) { |
| // For now the only OOB messages are Mirrors messages. |
| HandleMirrorsMessage(isolate_, message->reply_port(), msg); |
| delete message; |
| } else { |
| const Object& result = Object::Handle( |
| DartLibraryCalls::HandleMessage( |
| message->dest_port(), message->reply_port(), msg)); |
| delete message; |
| if (result.IsError()) { |
| isolate_->object_store()->set_sticky_error(Error::Cast(result)); |
| return false; |
| } |
| ASSERT(result.IsNull()); |
| } |
| return true; |
| } |
| |
| |
| #if defined(DEBUG) |
| void IsolateMessageHandler::CheckAccess() { |
| ASSERT(IsCurrentIsolate()); |
| } |
| #endif |
| |
| |
| bool IsolateMessageHandler::IsCurrentIsolate() const { |
| return (isolate_ == Isolate::Current()); |
| } |
| |
| |
| #if defined(DEBUG) |
| // static |
| void BaseIsolate::AssertCurrent(BaseIsolate* isolate) { |
| ASSERT(isolate == Isolate::Current()); |
| } |
| #endif |
| |
| |
| Isolate::Isolate() |
| : store_buffer_block_(), |
| store_buffer_(), |
| message_notify_callback_(NULL), |
| name_(NULL), |
| main_port_(0), |
| heap_(NULL), |
| object_store_(NULL), |
| top_context_(Context::null()), |
| random_seed_(Random::kDefaultRandomSeed), |
| top_exit_frame_info_(0), |
| init_callback_data_(NULL), |
| library_tag_handler_(NULL), |
| api_state_(NULL), |
| stub_code_(NULL), |
| debugger_(NULL), |
| long_jump_base_(NULL), |
| timer_list_(), |
| deopt_id_(0), |
| ic_data_array_(Array::null()), |
| mutex_(new Mutex()), |
| stack_limit_(0), |
| saved_stack_limit_(0), |
| message_handler_(NULL), |
| spawn_data_(NULL), |
| gc_prologue_callbacks_(), |
| gc_epilogue_callbacks_(), |
| deopt_cpu_registers_copy_(NULL), |
| deopt_xmm_registers_copy_(NULL), |
| deopt_frame_copy_(NULL), |
| deopt_frame_copy_size_(0), |
| deferred_doubles_(NULL), |
| deferred_mints_(NULL) { |
| } |
| |
| |
| Isolate::~Isolate() { |
| delete [] name_; |
| delete heap_; |
| delete object_store_; |
| delete api_state_; |
| delete stub_code_; |
| delete debugger_; |
| delete mutex_; |
| mutex_ = NULL; // Fail fast if interrupts are scheduled on a dead isolate. |
| delete message_handler_; |
| message_handler_ = NULL; // Fail fast if we send messages to a dead isolate. |
| } |
| |
| void Isolate::SetCurrent(Isolate* current) { |
| Thread::SetThreadLocal(isolate_key, reinterpret_cast<uword>(current)); |
| } |
| |
| |
| // The single thread local key which stores all the thread local data |
| // for a thread. Since an Isolate is the central repository for |
| // storing all isolate specific information a single thread local key |
| // is sufficient. |
| ThreadLocalKey Isolate::isolate_key = Thread::kUnsetThreadLocalKey; |
| |
| |
| void Isolate::InitOnce() { |
| ASSERT(isolate_key == Thread::kUnsetThreadLocalKey); |
| isolate_key = Thread::CreateThreadLocal(); |
| ASSERT(isolate_key != Thread::kUnsetThreadLocalKey); |
| create_callback_ = NULL; |
| } |
| |
| |
| Isolate* Isolate::Init(const char* name_prefix) { |
| Isolate* result = new Isolate(); |
| ASSERT(result != NULL); |
| |
| // TODO(5411455): For now just set the recently created isolate as |
| // the current isolate. |
| SetCurrent(result); |
| |
| // Setup the isolate message handler. |
| MessageHandler* handler = new IsolateMessageHandler(result); |
| ASSERT(handler != NULL); |
| result->set_message_handler(handler); |
| |
| // Setup the Dart API state. |
| ApiState* state = new ApiState(); |
| ASSERT(state != NULL); |
| result->set_api_state(state); |
| |
| // Initialize stack top and limit in case we are running the isolate in the |
| // main thread. |
| // TODO(5411455): Need to figure out how to set the stack limit for the |
| // main thread. |
| result->SetStackLimitFromCurrentTOS(reinterpret_cast<uword>(&result)); |
| result->set_main_port(PortMap::CreatePort(result->message_handler())); |
| result->BuildName(name_prefix); |
| |
| result->debugger_ = new Debugger(); |
| result->debugger_->Initialize(result); |
| if (FLAG_trace_isolates) { |
| if (name_prefix == NULL || strcmp(name_prefix, "vm-isolate") != 0) { |
| OS::Print("[+] Starting isolate:\n" |
| "\tisolate: %s\n", result->name()); |
| } |
| } |
| return result; |
| } |
| |
| |
| void Isolate::BuildName(const char* name_prefix) { |
| ASSERT(name_ == NULL); |
| if (name_prefix == NULL) { |
| name_prefix = "isolate"; |
| } |
| const char* kFormat = "%s-%lld"; |
| intptr_t len = OS::SNPrint(NULL, 0, kFormat, name_prefix, main_port()) + 1; |
| name_ = new char[len]; |
| OS::SNPrint(name_, len, kFormat, name_prefix, main_port()); |
| } |
| |
| |
| // TODO(5411455): Use flag to override default value and Validate the |
| // stack size by querying OS. |
| uword Isolate::GetSpecifiedStackSize() { |
| ASSERT(Isolate::kStackSizeBuffer < Thread::GetMaxStackSize()); |
| uword stack_size = Thread::GetMaxStackSize() - Isolate::kStackSizeBuffer; |
| return stack_size; |
| } |
| |
| |
| void Isolate::SetStackLimitFromCurrentTOS(uword stack_top_value) { |
| SetStackLimit(stack_top_value - GetSpecifiedStackSize()); |
| } |
| |
| |
| void Isolate::SetStackLimit(uword limit) { |
| MutexLocker ml(mutex_); |
| if (stack_limit_ == saved_stack_limit_) { |
| // No interrupt pending, set stack_limit_ too. |
| stack_limit_ = limit; |
| } |
| saved_stack_limit_ = limit; |
| } |
| |
| |
| void Isolate::ScheduleInterrupts(uword interrupt_bits) { |
| // TODO(turnidge): Can't use MutexLocker here because MutexLocker is |
| // a StackResource, which requires a current isolate. Should |
| // MutexLocker really be a StackResource? |
| mutex_->Lock(); |
| ASSERT((interrupt_bits & ~kInterruptsMask) == 0); // Must fit in mask. |
| if (stack_limit_ == saved_stack_limit_) { |
| stack_limit_ = (~static_cast<uword>(0)) & ~kInterruptsMask; |
| } |
| stack_limit_ |= interrupt_bits; |
| mutex_->Unlock(); |
| } |
| |
| |
| uword Isolate::GetAndClearInterrupts() { |
| MutexLocker ml(mutex_); |
| if (stack_limit_ == saved_stack_limit_) { |
| return 0; // No interrupt was requested. |
| } |
| uword interrupt_bits = stack_limit_ & kInterruptsMask; |
| stack_limit_ = saved_stack_limit_; |
| return interrupt_bits; |
| } |
| |
| |
| ICData* Isolate::GetICDataForDeoptId(intptr_t deopt_id) const { |
| if (ic_data_array() == Array::null()) { |
| return &ICData::ZoneHandle(); |
| } |
| const Array& array_handle = Array::Handle(ic_data_array()); |
| if (deopt_id >= array_handle.Length()) { |
| // For computations being added in the optimizing compiler. |
| return &ICData::ZoneHandle(); |
| } |
| ICData& ic_data_handle = ICData::ZoneHandle(); |
| ic_data_handle ^= array_handle.At(deopt_id); |
| return &ic_data_handle; |
| } |
| |
| |
| static int MostUsedFunctionFirst(const Function* const* a, |
| const Function* const* b) { |
| if ((*a)->usage_counter() > (*b)->usage_counter()) { |
| return -1; |
| } else if ((*a)->usage_counter() < (*b)->usage_counter()) { |
| return 1; |
| } else { |
| return 0; |
| } |
| } |
| |
| |
| static void AddFunctionsFromClass(const Class& cls, |
| GrowableArray<const Function*>* functions) { |
| const Array& class_functions = Array::Handle(cls.functions()); |
| // Class 'dynamic' is allocated/initialized in a special way, leaving |
| // the functions field NULL instead of empty. |
| const int func_len = class_functions.IsNull() ? 0 : class_functions.Length(); |
| for (int j = 0; j < func_len; j++) { |
| Function& function = Function::Handle(); |
| function ^= class_functions.At(j); |
| if (function.usage_counter() > 0) { |
| functions->Add(&function); |
| } |
| } |
| } |
| |
| |
| void Isolate::PrintInvokedFunctions() { |
| ASSERT(this == Isolate::Current()); |
| StackZone zone(this); |
| HandleScope handle_scope(this); |
| const GrowableObjectArray& libraries = |
| GrowableObjectArray::Handle(object_store()->libraries()); |
| Library& library = Library::Handle(); |
| GrowableArray<const Function*> invoked_functions; |
| for (int i = 0; i < libraries.Length(); i++) { |
| library ^= libraries.At(i); |
| Class& cls = Class::Handle(); |
| ClassDictionaryIterator iter(library); |
| while (iter.HasNext()) { |
| cls = iter.GetNextClass(); |
| AddFunctionsFromClass(cls, &invoked_functions); |
| } |
| Array& anon_classes = Array::Handle(library.raw_ptr()->anonymous_classes_); |
| for (int i = 0; i < library.raw_ptr()->num_anonymous_; i++) { |
| cls ^= anon_classes.At(i); |
| AddFunctionsFromClass(cls, &invoked_functions); |
| } |
| } |
| invoked_functions.Sort(MostUsedFunctionFirst); |
| for (int i = 0; i < invoked_functions.length(); i++) { |
| OS::Print("%10"Pd" x %s\n", |
| invoked_functions[i]->usage_counter(), |
| invoked_functions[i]->ToFullyQualifiedCString()); |
| } |
| } |
| |
| |
| class FinalizeWeakPersistentHandlesVisitor : public HandleVisitor { |
| public: |
| FinalizeWeakPersistentHandlesVisitor() { |
| } |
| |
| void VisitHandle(uword addr) { |
| FinalizablePersistentHandle* handle = |
| reinterpret_cast<FinalizablePersistentHandle*>(addr); |
| FinalizablePersistentHandle::Finalize(handle); |
| } |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(FinalizeWeakPersistentHandlesVisitor); |
| }; |
| |
| |
| void Isolate::Shutdown() { |
| ASSERT(this == Isolate::Current()); |
| ASSERT(top_resource() == NULL); |
| ASSERT((heap_ == NULL) || heap_->Verify()); |
| |
| // Clean up debugger resources. Shutting down the debugger |
| // requires a handle zone. We must set up a temporary zone because |
| // Isolate::Shutdown is called without a zone. |
| { |
| StackZone zone(this); |
| HandleScope handle_scope(this); |
| debugger_->Shutdown(); |
| } |
| |
| // Close all the ports owned by this isolate. |
| PortMap::ClosePorts(message_handler()); |
| |
| // Fail fast if anybody tries to post any more messsages to this isolate. |
| delete message_handler(); |
| set_message_handler(NULL); |
| |
| // Finalize any weak persistent handles with a non-null referent. |
| FinalizeWeakPersistentHandlesVisitor visitor; |
| api_state()->weak_persistent_handles().VisitHandles(&visitor); |
| |
| // Dump all accumalated timer data for the isolate. |
| timer_list_.ReportTimers(); |
| if (FLAG_report_usage_count) { |
| PrintInvokedFunctions(); |
| } |
| CompilerStats::Print(); |
| if (FLAG_generate_gdb_symbols) { |
| DebugInfo::UnregisterAllSections(); |
| } |
| if (FLAG_trace_isolates) { |
| StackZone zone(this); |
| HandleScope handle_scope(this); |
| OS::Print("Number of symbols added = %"Pd"\n", Symbols::Size(this)); |
| OS::Print("[-] Stopping isolate:\n" |
| "\tisolate: %s\n", name()); |
| } |
| // TODO(5411455): For now just make sure there are no current isolates |
| // as we are shutting down the isolate. |
| SetCurrent(NULL); |
| } |
| |
| |
| Dart_IsolateCreateCallback Isolate::create_callback_ = NULL; |
| Dart_IsolateInterruptCallback Isolate::interrupt_callback_ = NULL; |
| Dart_IsolateShutdownCallback Isolate::shutdown_callback_ = NULL; |
| |
| |
| void Isolate::VisitObjectPointers(ObjectPointerVisitor* visitor, |
| bool visit_prologue_weak_handles, |
| bool validate_frames) { |
| ASSERT(visitor != NULL); |
| |
| // Visit objects in the object store. |
| object_store()->VisitObjectPointers(visitor); |
| |
| // Visit objects in the class table. |
| class_table()->VisitObjectPointers(visitor); |
| |
| // Visit objects in per isolate stubs. |
| StubCode::VisitObjectPointers(visitor); |
| |
| // Visit objects in zones. |
| current_zone()->VisitObjectPointers(visitor); |
| |
| // Iterate over all the stack frames and visit objects on the stack. |
| StackFrameIterator frames_iterator(validate_frames); |
| StackFrame* frame = frames_iterator.NextFrame(); |
| while (frame != NULL) { |
| frame->VisitObjectPointers(visitor); |
| frame = frames_iterator.NextFrame(); |
| } |
| |
| // Visit the dart api state for all local and persistent handles. |
| if (api_state() != NULL) { |
| api_state()->VisitObjectPointers(visitor, visit_prologue_weak_handles); |
| } |
| |
| // Visit the top context which is stored in the isolate. |
| visitor->VisitPointer(reinterpret_cast<RawObject**>(&top_context_)); |
| |
| // Visit the currently active IC data array. |
| visitor->VisitPointer(reinterpret_cast<RawObject**>(&ic_data_array_)); |
| |
| // Visit objects in the debugger. |
| debugger()->VisitObjectPointers(visitor); |
| } |
| |
| |
| void Isolate::VisitWeakPersistentHandles(HandleVisitor* visitor, |
| bool visit_prologue_weak_handles) { |
| if (api_state() != NULL) { |
| api_state()->VisitWeakHandles(visitor, visit_prologue_weak_handles); |
| } |
| } |
| |
| } // namespace dart |