blob: e68d40c36cceb163fb5d18b625e678d733c5a525 [file] [log] [blame]
// Copyright (c) 2013, 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 <utility>
#include "vm/isolate.h"
#include "include/dart_api.h"
#include "include/dart_native_api.h"
#include "platform/assert.h"
#include "platform/atomic.h"
#include "platform/text_buffer.h"
#include "vm/class_finalizer.h"
#include "vm/code_observers.h"
#include "vm/compiler/jit/compiler.h"
#include "vm/dart_api_message.h"
#include "vm/dart_api_state.h"
#include "vm/dart_entry.h"
#include "vm/debugger.h"
#include "vm/deopt_instructions.h"
#include "vm/flags.h"
#include "vm/heap/heap.h"
#include "vm/heap/pointer_block.h"
#include "vm/heap/safepoint.h"
#include "vm/heap/verifier.h"
#include "vm/image_snapshot.h"
#include "vm/interpreter.h"
#include "vm/isolate_reload.h"
#include "vm/kernel_isolate.h"
#include "vm/lockers.h"
#include "vm/log.h"
#include "vm/message_handler.h"
#include "vm/object.h"
#include "vm/object_id_ring.h"
#include "vm/object_store.h"
#include "vm/os_thread.h"
#include "vm/port.h"
#include "vm/profiler.h"
#include "vm/reusable_handles.h"
#include "vm/reverse_pc_lookup_cache.h"
#include "vm/service.h"
#include "vm/service_event.h"
#include "vm/service_isolate.h"
#include "vm/simulator.h"
#include "vm/stack_frame.h"
#include "vm/stub_code.h"
#include "vm/symbols.h"
#include "vm/tags.h"
#include "vm/thread_interrupter.h"
#include "vm/thread_registry.h"
#include "vm/timeline.h"
#include "vm/timeline_analysis.h"
#include "vm/visitor.h"
namespace dart {
DECLARE_FLAG(bool, print_metrics);
DECLARE_FLAG(bool, timing);
DECLARE_FLAG(bool, trace_service);
DECLARE_FLAG(bool, warn_on_pause_with_no_debugger);
// Reload flags.
DECLARE_FLAG(int, reload_every);
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
DECLARE_FLAG(bool, check_reloaded);
DECLARE_FLAG(bool, reload_every_back_off);
DECLARE_FLAG(bool, trace_reload);
#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
static void DeterministicModeHandler(bool value) {
if (value) {
FLAG_background_compilation = false; // Timing dependent.
FLAG_concurrent_mark = false; // Timing dependent.
FLAG_concurrent_sweep = false; // Timing dependent.
FLAG_random_seed = 0x44617274; // "Dart"
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
FLAG_load_deferred_eagerly = true;
#else
COMPILE_ASSERT(FLAG_load_deferred_eagerly);
#endif
}
}
DEFINE_FLAG_HANDLER(DeterministicModeHandler,
deterministic,
"Enable deterministic mode.");
// Quick access to the locally defined thread() and isolate() methods.
#define T (thread())
#define I (isolate())
#if defined(DEBUG)
// Helper class to ensure that a live origin_id is never reused
// and assigned to an isolate.
class VerifyOriginId : public IsolateVisitor {
public:
explicit VerifyOriginId(Dart_Port id) : id_(id) {}
void VisitIsolate(Isolate* isolate) { ASSERT(isolate->origin_id() != id_); }
private:
Dart_Port id_;
DISALLOW_COPY_AND_ASSIGN(VerifyOriginId);
};
#endif
static std::unique_ptr<Message> SerializeMessage(Dart_Port dest_port,
const Instance& obj) {
if (ApiObjectConverter::CanConvert(obj.raw())) {
return Message::New(dest_port, obj.raw(), Message::kNormalPriority);
} else {
MessageWriter writer(false);
return writer.WriteMessage(obj, dest_port, Message::kNormalPriority);
}
}
static RawInstance* DeserializeMessage(Thread* thread, Message* message) {
if (message == NULL) {
return Instance::null();
}
Zone* zone = thread->zone();
if (message->IsRaw()) {
return Instance::RawCast(message->raw_obj());
} else {
MessageSnapshotReader reader(message, thread);
const Object& obj = Object::Handle(zone, reader.ReadObject());
ASSERT(!obj.IsError());
return Instance::RawCast(obj.raw());
}
}
bool IsolateVisitor::IsVMInternalIsolate(Isolate* isolate) const {
return Isolate::IsVMInternalIsolate(isolate);
}
NoOOBMessageScope::NoOOBMessageScope(Thread* thread)
: ThreadStackResource(thread) {
thread->DeferOOBMessageInterrupts();
}
NoOOBMessageScope::~NoOOBMessageScope() {
thread()->RestoreOOBMessageInterrupts();
}
NoReloadScope::NoReloadScope(Isolate* isolate, Thread* thread)
: ThreadStackResource(thread), isolate_(isolate) {
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
ASSERT(isolate_ != NULL);
AtomicOperations::FetchAndIncrement(&(isolate_->no_reload_scope_depth_));
ASSERT(AtomicOperations::LoadRelaxed(&(isolate_->no_reload_scope_depth_)) >=
0);
#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
}
NoReloadScope::~NoReloadScope() {
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
AtomicOperations::FetchAndDecrement(&(isolate_->no_reload_scope_depth_));
ASSERT(AtomicOperations::LoadRelaxed(&(isolate_->no_reload_scope_depth_)) >=
0);
#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
}
void Isolate::RegisterClass(const Class& cls) {
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
if (IsReloading()) {
reload_context()->RegisterClass(cls);
return;
}
#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
class_table()->Register(cls);
}
#if defined(DEBUG)
void Isolate::ValidateClassTable() {
class_table()->Validate();
}
#endif // DEBUG
void Isolate::RehashConstants() {
StackZone stack_zone(Thread::Current());
Zone* zone = stack_zone.GetZone();
Class& cls = Class::Handle(zone);
intptr_t top = class_table()->NumCids();
for (intptr_t cid = kInstanceCid; cid < top; cid++) {
if (!class_table()->IsValidIndex(cid) ||
!class_table()->HasValidClassAt(cid)) {
continue;
}
if ((cid == kTypeArgumentsCid) || RawObject::IsStringClassId(cid)) {
// TypeArguments and Symbols have special tables for canonical objects
// that aren't based on address.
continue;
}
cls = class_table()->At(cid);
cls.RehashConstants(zone);
}
}
#if defined(DEBUG)
void Isolate::ValidateConstants() {
if (FLAG_precompiled_mode) {
// TODO(27003)
return;
}
if (HasAttemptedReload()) {
return;
}
// Verify that all canonical instances are correctly setup in the
// corresponding canonical tables.
BackgroundCompiler::Stop(this);
heap()->CollectAllGarbage();
Thread* thread = Thread::Current();
HeapIterationScope iteration(thread);
VerifyCanonicalVisitor check_canonical(thread);
iteration.IterateObjects(&check_canonical);
}
#endif // DEBUG
void Isolate::SendInternalLibMessage(LibMsgId msg_id, uint64_t capability) {
const Array& msg = Array::Handle(Array::New(3));
Object& element = Object::Handle();
element = Smi::New(Message::kIsolateLibOOBMsg);
msg.SetAt(0, element);
element = Smi::New(msg_id);
msg.SetAt(1, element);
element = Capability::New(capability);
msg.SetAt(2, element);
MessageWriter writer(false);
PortMap::PostMessage(
writer.WriteMessage(msg, main_port(), Message::kOOBPriority));
}
class IsolateMessageHandler : public MessageHandler {
public:
explicit IsolateMessageHandler(Isolate* isolate);
~IsolateMessageHandler();
const char* name() const;
void MessageNotify(Message::Priority priority);
MessageStatus HandleMessage(std::unique_ptr<Message> message);
#ifndef PRODUCT
void NotifyPauseOnStart();
void NotifyPauseOnExit();
#endif // !PRODUCT
#if defined(DEBUG)
// Check that it is safe to access this handler.
void CheckAccess();
#endif
bool IsCurrentIsolate() const;
virtual Isolate* isolate() const { return isolate_; }
private:
// A result of false indicates that the isolate should terminate the
// processing of further events.
RawError* HandleLibMessage(const Array& message);
MessageStatus ProcessUnhandledException(const Error& result);
Isolate* isolate_;
};
IsolateMessageHandler::IsolateMessageHandler(Isolate* isolate)
: isolate_(isolate) {}
IsolateMessageHandler::~IsolateMessageHandler() {}
const char* IsolateMessageHandler::name() const {
return isolate_->name();
}
// Isolate library OOB messages are fixed sized arrays which have the
// following format:
// [ OOB dispatch, Isolate library dispatch, <message specific data> ]
RawError* IsolateMessageHandler::HandleLibMessage(const Array& message) {
if (message.Length() < 2) return Error::null();
Zone* zone = T->zone();
const Object& type = Object::Handle(zone, message.At(1));
if (!type.IsSmi()) return Error::null();
const intptr_t msg_type = Smi::Cast(type).Value();
switch (msg_type) {
case Isolate::kPauseMsg: {
// [ OOB, kPauseMsg, pause capability, resume capability ]
if (message.Length() != 4) return Error::null();
Object& obj = Object::Handle(zone, message.At(2));
if (!I->VerifyPauseCapability(obj)) return Error::null();
obj = message.At(3);
if (!obj.IsCapability()) return Error::null();
if (I->AddResumeCapability(Capability::Cast(obj))) {
increment_paused();
}
break;
}
case Isolate::kResumeMsg: {
// [ OOB, kResumeMsg, pause capability, resume capability ]
if (message.Length() != 4) return Error::null();
Object& obj = Object::Handle(zone, message.At(2));
if (!I->VerifyPauseCapability(obj)) return Error::null();
obj = message.At(3);
if (!obj.IsCapability()) return Error::null();
if (I->RemoveResumeCapability(Capability::Cast(obj))) {
decrement_paused();
}
break;
}
case Isolate::kPingMsg: {
// [ OOB, kPingMsg, responsePort, priority, response ]
if (message.Length() != 5) return Error::null();
const Object& obj2 = Object::Handle(zone, message.At(2));
if (!obj2.IsSendPort()) return Error::null();
const SendPort& send_port = SendPort::Cast(obj2);
const Object& obj3 = Object::Handle(zone, message.At(3));
if (!obj3.IsSmi()) return Error::null();
const intptr_t priority = Smi::Cast(obj3).Value();
const Object& obj4 = Object::Handle(zone, message.At(4));
if (!obj4.IsInstance() && !obj4.IsNull()) return Error::null();
const Instance& response =
obj4.IsNull() ? Instance::null_instance() : Instance::Cast(obj4);
if (priority == Isolate::kImmediateAction) {
PortMap::PostMessage(SerializeMessage(send_port.Id(), response));
} else {
ASSERT((priority == Isolate::kBeforeNextEventAction) ||
(priority == Isolate::kAsEventAction));
// Update the message so that it will be handled immediately when it
// is picked up from the message queue the next time.
message.SetAt(
0, Smi::Handle(zone, Smi::New(Message::kDelayedIsolateLibOOBMsg)));
message.SetAt(3,
Smi::Handle(zone, Smi::New(Isolate::kImmediateAction)));
this->PostMessage(
SerializeMessage(Message::kIllegalPort, message),
priority == Isolate::kBeforeNextEventAction /* at_head */);
}
break;
}
case Isolate::kKillMsg:
case Isolate::kInternalKillMsg: {
// [ OOB, kKillMsg, terminate capability, priority ]
if (message.Length() != 4) return Error::null();
Object& obj = Object::Handle(zone, message.At(3));
if (!obj.IsSmi()) return Error::null();
const intptr_t priority = Smi::Cast(obj).Value();
if (priority == Isolate::kImmediateAction) {
obj = message.At(2);
if (I->VerifyTerminateCapability(obj)) {
// We will kill the current isolate by returning an UnwindError.
if (msg_type == Isolate::kKillMsg) {
const String& msg = String::Handle(
String::New("isolate terminated by Isolate.kill"));
const UnwindError& error =
UnwindError::Handle(UnwindError::New(msg));
error.set_is_user_initiated(true);
return error.raw();
} else if (msg_type == Isolate::kInternalKillMsg) {
const String& msg =
String::Handle(String::New("isolate terminated by vm"));
return UnwindError::New(msg);
} else {
UNREACHABLE();
}
} else {
return Error::null();
}
} else {
ASSERT((priority == Isolate::kBeforeNextEventAction) ||
(priority == Isolate::kAsEventAction));
// Update the message so that it will be handled immediately when it
// is picked up from the message queue the next time.
message.SetAt(
0, Smi::Handle(zone, Smi::New(Message::kDelayedIsolateLibOOBMsg)));
message.SetAt(3,
Smi::Handle(zone, Smi::New(Isolate::kImmediateAction)));
this->PostMessage(
SerializeMessage(Message::kIllegalPort, message),
priority == Isolate::kBeforeNextEventAction /* at_head */);
}
break;
}
case Isolate::kInterruptMsg: {
// [ OOB, kInterruptMsg, pause capability ]
if (message.Length() != 3) return Error::null();
Object& obj = Object::Handle(zone, message.At(2));
if (!I->VerifyPauseCapability(obj)) return Error::null();
#if !defined(PRODUCT)
// If we are already paused, don't pause again.
if (I->debugger()->PauseEvent() == NULL) {
return I->debugger()->PauseInterrupted();
}
#endif
break;
}
case Isolate::kLowMemoryMsg: {
I->heap()->NotifyLowMemory();
break;
}
case Isolate::kDrainServiceExtensionsMsg: {
#ifndef PRODUCT
Object& obj = Object::Handle(zone, message.At(2));
if (!obj.IsSmi()) return Error::null();
const intptr_t priority = Smi::Cast(obj).Value();
if (priority == Isolate::kImmediateAction) {
return I->InvokePendingServiceExtensionCalls();
} else {
ASSERT((priority == Isolate::kBeforeNextEventAction) ||
(priority == Isolate::kAsEventAction));
// Update the message so that it will be handled immediately when it
// is picked up from the message queue the next time.
message.SetAt(
0, Smi::Handle(zone, Smi::New(Message::kDelayedIsolateLibOOBMsg)));
message.SetAt(2,
Smi::Handle(zone, Smi::New(Isolate::kImmediateAction)));
this->PostMessage(
SerializeMessage(Message::kIllegalPort, message),
priority == Isolate::kBeforeNextEventAction /* at_head */);
}
#else
UNREACHABLE();
#endif // !PRODUCT
break;
}
case Isolate::kAddExitMsg:
case Isolate::kDelExitMsg:
case Isolate::kAddErrorMsg:
case Isolate::kDelErrorMsg: {
// [ OOB, msg, listener port ]
if (message.Length() < 3) return Error::null();
const Object& obj = Object::Handle(zone, message.At(2));
if (!obj.IsSendPort()) return Error::null();
const SendPort& listener = SendPort::Cast(obj);
switch (msg_type) {
case Isolate::kAddExitMsg: {
if (message.Length() != 4) return Error::null();
// [ OOB, msg, listener port, response object ]
const Object& response = Object::Handle(zone, message.At(3));
if (!response.IsInstance() && !response.IsNull()) {
return Error::null();
}
I->AddExitListener(listener, response.IsNull()
? Instance::null_instance()
: Instance::Cast(response));
break;
}
case Isolate::kDelExitMsg:
if (message.Length() != 3) return Error::null();
I->RemoveExitListener(listener);
break;
case Isolate::kAddErrorMsg:
if (message.Length() != 3) return Error::null();
I->AddErrorListener(listener);
break;
case Isolate::kDelErrorMsg:
if (message.Length() != 3) return Error::null();
I->RemoveErrorListener(listener);
break;
default:
UNREACHABLE();
}
break;
}
case Isolate::kErrorFatalMsg: {
// [ OOB, kErrorFatalMsg, terminate capability, val ]
if (message.Length() != 4) return Error::null();
// Check that the terminate capability has been passed correctly.
Object& obj = Object::Handle(zone, message.At(2));
if (!I->VerifyTerminateCapability(obj)) return Error::null();
// Get the value to be set.
obj = message.At(3);
if (!obj.IsBool()) return Error::null();
I->SetErrorsFatal(Bool::Cast(obj).value());
break;
}
#if defined(DEBUG)
// Malformed OOB messages are silently ignored in release builds.
default:
FATAL1("Unknown OOB message type: %" Pd "\n", msg_type);
break;
#endif // defined(DEBUG)
}
return Error::null();
}
void IsolateMessageHandler::MessageNotify(Message::Priority priority) {
if (priority >= Message::kOOBPriority) {
// Handle out of band messages even if the mutator thread is busy.
I->ScheduleInterrupts(Thread::kMessageInterrupt);
}
Dart_MessageNotifyCallback callback = I->message_notify_callback();
if (callback) {
// Allow the embedder to handle message notification.
(*callback)(Api::CastIsolate(I));
}
}
bool Isolate::HasPendingMessages() {
return message_handler_->HasMessages() || message_handler_->HasOOBMessages();
}
MessageHandler::MessageStatus IsolateMessageHandler::HandleMessage(
std::unique_ptr<Message> message) {
ASSERT(IsCurrentIsolate());
Thread* thread = Thread::Current();
StackZone stack_zone(thread);
Zone* zone = stack_zone.GetZone();
HandleScope handle_scope(thread);
#if defined(SUPPORT_TIMELINE)
TimelineDurationScope tds(
thread, Timeline::GetIsolateStream(),
message->IsOOB() ? "HandleOOBMessage" : "HandleMessage");
tds.SetNumArguments(1);
tds.CopyArgument(0, "isolateName", I->name());
#endif
// If the message is in band we lookup the handler to dispatch to. If the
// receive port was closed, we drop the message without deserializing it.
// Illegal port is a special case for artificially enqueued isolate library
// messages which are handled in C++ code below.
Object& msg_handler = Object::Handle(zone);
if (!message->IsOOB() && (message->dest_port() != Message::kIllegalPort)) {
msg_handler = DartLibraryCalls::LookupHandler(message->dest_port());
if (msg_handler.IsError()) {
return ProcessUnhandledException(Error::Cast(msg_handler));
}
if (msg_handler.IsNull()) {
// If the port has been closed then the message will be dropped at this
// point. Make sure to post to the delivery failure port in that case.
if (message->RedirectToDeliveryFailurePort()) {
PortMap::PostMessage(std::move(message));
}
return kOK;
}
}
// Parse the message.
Object& msg_obj = Object::Handle(zone);
if (message->IsRaw()) {
msg_obj = message->raw_obj();
// We should only be sending RawObjects that can be converted to CObjects.
ASSERT(ApiObjectConverter::CanConvert(msg_obj.raw()));
} else {
MessageSnapshotReader reader(message.get(), thread);
msg_obj = reader.ReadObject();
}
if (msg_obj.IsError()) {
// An error occurred while reading the message.
return ProcessUnhandledException(Error::Cast(msg_obj));
}
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(zone);
msg ^= msg_obj.raw(); // Can't use Instance::Cast because may be null.
MessageStatus status = kOK;
if (message->IsOOB()) {
// OOB messages are expected to be fixed length arrays where the first
// element is a Smi describing the OOB destination. Messages that do not
// confirm to this layout are silently ignored.
if (msg.IsArray()) {
const Array& oob_msg = Array::Cast(msg);
if (oob_msg.Length() > 0) {
const Object& oob_tag = Object::Handle(zone, oob_msg.At(0));
if (oob_tag.IsSmi()) {
switch (Smi::Cast(oob_tag).Value()) {
case Message::kServiceOOBMsg: {
if (FLAG_support_service) {
const Error& error =
Error::Handle(Service::HandleIsolateMessage(I, oob_msg));
if (!error.IsNull()) {
status = ProcessUnhandledException(error);
}
} else {
UNREACHABLE();
}
break;
}
case Message::kIsolateLibOOBMsg: {
const Error& error = Error::Handle(HandleLibMessage(oob_msg));
if (!error.IsNull()) {
status = ProcessUnhandledException(error);
}
break;
}
#if defined(DEBUG)
// Malformed OOB messages are silently ignored in release builds.
default: {
UNREACHABLE();
break;
}
#endif // defined(DEBUG)
}
}
}
}
} else if (message->dest_port() == Message::kIllegalPort) {
// Check whether this is a delayed OOB message which needed handling as
// part of the regular message dispatch. All other messages are dropped on
// the floor.
if (msg.IsArray()) {
const Array& msg_arr = Array::Cast(msg);
if (msg_arr.Length() > 0) {
const Object& oob_tag = Object::Handle(zone, msg_arr.At(0));
if (oob_tag.IsSmi() &&
(Smi::Cast(oob_tag).Value() == Message::kDelayedIsolateLibOOBMsg)) {
const Error& error = Error::Handle(HandleLibMessage(msg_arr));
if (!error.IsNull()) {
status = ProcessUnhandledException(error);
}
}
}
}
} else {
#ifndef PRODUCT
if (!Isolate::IsVMInternalIsolate(I)) {
// Mark all the user isolates as white-listed for the simplified timeline
// page of Observatory. The internal isolates will be filtered out from
// the Timeline due to absence of this argument. We still send them in
// order to maintain the original behavior of the full timeline and allow
// the developer to download complete dump files.
tds.SetNumArguments(2);
tds.CopyArgument(1, "mode", "basic");
}
#endif
const Object& result =
Object::Handle(zone, DartLibraryCalls::HandleMessage(msg_handler, msg));
if (result.IsError()) {
status = ProcessUnhandledException(Error::Cast(result));
} else {
ASSERT(result.IsNull());
}
}
return status;
}
#ifndef PRODUCT
void IsolateMessageHandler::NotifyPauseOnStart() {
if (!FLAG_support_service || Isolate::IsVMInternalIsolate(I)) {
return;
}
if (Service::debug_stream.enabled() || FLAG_warn_on_pause_with_no_debugger) {
StartIsolateScope start_isolate(I);
StackZone zone(T);
HandleScope handle_scope(T);
ServiceEvent pause_event(I, ServiceEvent::kPauseStart);
Service::HandleEvent(&pause_event);
} else if (FLAG_trace_service) {
OS::PrintErr("vm-service: Dropping event of type PauseStart (%s)\n",
I->name());
}
}
void IsolateMessageHandler::NotifyPauseOnExit() {
if (!FLAG_support_service || Isolate::IsVMInternalIsolate(I)) {
return;
}
if (Service::debug_stream.enabled() || FLAG_warn_on_pause_with_no_debugger) {
StartIsolateScope start_isolate(I);
StackZone zone(T);
HandleScope handle_scope(T);
ServiceEvent pause_event(I, ServiceEvent::kPauseExit);
Service::HandleEvent(&pause_event);
} else if (FLAG_trace_service) {
OS::PrintErr("vm-service: Dropping event of type PauseExit (%s)\n",
I->name());
}
}
#endif // !PRODUCT
#if defined(DEBUG)
void IsolateMessageHandler::CheckAccess() {
ASSERT(IsCurrentIsolate());
}
#endif
bool IsolateMessageHandler::IsCurrentIsolate() const {
return (I == Isolate::Current());
}
static MessageHandler::MessageStatus StoreError(Thread* thread,
const Error& error) {
thread->set_sticky_error(error);
if (error.IsUnwindError()) {
const UnwindError& unwind = UnwindError::Cast(error);
if (!unwind.is_user_initiated()) {
return MessageHandler::kShutdown;
}
}
return MessageHandler::kError;
}
MessageHandler::MessageStatus IsolateMessageHandler::ProcessUnhandledException(
const Error& result) {
if (FLAG_trace_isolates) {
OS::PrintErr(
"[!] Unhandled exception in %s:\n"
" exception: %s\n",
T->isolate()->name(), result.ToErrorCString());
}
NoReloadScope no_reload_scope(T->isolate(), T);
// Generate the error and stacktrace strings for the error message.
String& exc_str = String::Handle(T->zone());
String& stacktrace_str = String::Handle(T->zone());
if (result.IsUnhandledException()) {
Zone* zone = T->zone();
const UnhandledException& uhe = UnhandledException::Cast(result);
const Instance& exception = Instance::Handle(zone, uhe.exception());
Object& tmp = Object::Handle(zone);
tmp = DartLibraryCalls::ToString(exception);
if (!tmp.IsString()) {
tmp = String::New(exception.ToCString());
}
exc_str ^= tmp.raw();
const Instance& stacktrace = Instance::Handle(zone, uhe.stacktrace());
tmp = DartLibraryCalls::ToString(stacktrace);
if (!tmp.IsString()) {
tmp = String::New(stacktrace.ToCString());
}
stacktrace_str ^= tmp.raw();
} else {
exc_str = String::New(result.ToErrorCString());
}
if (result.IsUnwindError()) {
// When unwinding we don't notify error listeners and we ignore
// whether errors are fatal for the current isolate.
return StoreError(T, result);
} else {
bool has_listener = I->NotifyErrorListeners(exc_str, stacktrace_str);
if (I->ErrorsFatal()) {
if (has_listener) {
T->ClearStickyError();
} else {
T->set_sticky_error(result);
}
#if !defined(PRODUCT)
// Notify the debugger about specific unhandled exceptions which are
// withheld when being thrown. Do this after setting the sticky error
// so the isolate has an error set when paused with the unhandled
// exception.
if (result.IsUnhandledException()) {
const UnhandledException& error = UnhandledException::Cast(result);
RawInstance* exception = error.exception();
if ((exception == I->object_store()->out_of_memory()) ||
(exception == I->object_store()->stack_overflow())) {
// We didn't notify the debugger when the stack was full. Do it now.
I->debugger()->PauseException(Instance::Handle(exception));
}
}
#endif // !defined(PRODUCT)
return kError;
}
}
return kOK;
}
void Isolate::FlagsInitialize(Dart_IsolateFlags* api_flags) {
const bool false_by_default = false;
const bool true_by_default = true;
USE(true_by_default);
USE(false_by_default);
api_flags->version = DART_FLAGS_CURRENT_VERSION;
#define INIT_FROM_FLAG(when, name, bitname, isolate_flag, flag) \
api_flags->isolate_flag = flag;
ISOLATE_FLAG_LIST(INIT_FROM_FLAG)
#undef INIT_FROM_FLAG
api_flags->entry_points = NULL;
api_flags->load_vmservice_library = false;
api_flags->copy_parent_code = false;
}
void Isolate::FlagsCopyTo(Dart_IsolateFlags* api_flags) const {
api_flags->version = DART_FLAGS_CURRENT_VERSION;
#define INIT_FROM_FIELD(when, name, bitname, isolate_flag, flag) \
api_flags->isolate_flag = name();
ISOLATE_FLAG_LIST(INIT_FROM_FIELD)
#undef INIT_FROM_FIELD
api_flags->entry_points = NULL;
api_flags->load_vmservice_library = should_load_vmservice();
api_flags->copy_parent_code = false;
}
void Isolate::FlagsCopyFrom(const Dart_IsolateFlags& api_flags) {
#if defined(DART_PRECOMPILER)
#define FLAG_FOR_PRECOMPILER(action) action
#else
#define FLAG_FOR_PRECOMPILER(action)
#endif
#if !defined(PRODUCT)
#define FLAG_FOR_NONPRODUCT(action) action
#else
#define FLAG_FOR_NONPRODUCT(action)
#endif
#define FLAG_FOR_PRODUCT(action) action
#define SET_FROM_FLAG(when, name, bitname, isolate_flag, flag) \
FLAG_FOR_##when(isolate_flags_ = bitname##Bit::update( \
api_flags.isolate_flag, isolate_flags_));
ISOLATE_FLAG_LIST(SET_FROM_FLAG)
#undef FLAG_FOR_NONPRODUCT
#undef FLAG_FOR_PRECOMPILER
#undef FLAG_FOR_PRODUCT
#undef SET_FROM_FLAG
set_should_load_vmservice(api_flags.load_vmservice_library);
// Copy entry points list.
ASSERT(embedder_entry_points_ == NULL);
if (api_flags.entry_points != NULL) {
intptr_t count = 0;
while (api_flags.entry_points[count].function_name != NULL)
count++;
embedder_entry_points_ = new Dart_QualifiedFunctionName[count + 1];
for (intptr_t i = 0; i < count; i++) {
embedder_entry_points_[i].library_uri =
strdup(api_flags.entry_points[i].library_uri);
embedder_entry_points_[i].class_name =
strdup(api_flags.entry_points[i].class_name);
embedder_entry_points_[i].function_name =
strdup(api_flags.entry_points[i].function_name);
}
memset(&embedder_entry_points_[count], 0,
sizeof(Dart_QualifiedFunctionName));
}
// Leave others at defaults.
}
#if defined(DEBUG)
// static
void BaseIsolate::AssertCurrent(BaseIsolate* isolate) {
ASSERT(isolate == Isolate::Current());
}
void BaseIsolate::AssertCurrentThreadIsMutator() const {
ASSERT(Isolate::Current() == this);
ASSERT(Thread::Current()->IsMutatorThread());
}
#endif // defined(DEBUG)
#if defined(DEBUG)
#define REUSABLE_HANDLE_SCOPE_INIT(object) \
reusable_##object##_handle_scope_active_(false),
#else
#define REUSABLE_HANDLE_SCOPE_INIT(object)
#endif // defined(DEBUG)
#define REUSABLE_HANDLE_INITIALIZERS(object) object##_handle_(nullptr),
// TODO(srdjan): Some Isolate monitors can be shared. Replace their usage with
// that shared monitor.
Isolate::Isolate(const Dart_IsolateFlags& api_flags)
: BaseIsolate(),
current_tag_(UserTag::null()),
default_tag_(UserTag::null()),
ic_miss_code_(Code::null()),
class_table_(),
store_buffer_(new StoreBuffer()),
#if !defined(PRODUCT)
last_resume_timestamp_(OS::GetCurrentTimeMillis()),
vm_tag_counters_(),
pending_service_extension_calls_(GrowableObjectArray::null()),
registered_service_extension_handlers_(GrowableObjectArray::null()),
#define ISOLATE_METRIC_CONSTRUCTORS(type, variable, name, unit) \
metric_##variable##_(),
ISOLATE_METRIC_LIST(ISOLATE_METRIC_CONSTRUCTORS)
#undef ISOLATE_METRIC_CONSTRUCTORS
reload_every_n_stack_overflow_checks_(FLAG_reload_every),
last_reload_timestamp_(OS::GetCurrentTimeMillis()),
#endif // !defined(PRODUCT)
start_time_micros_(OS::GetCurrentMonotonicMicros()),
thread_registry_(new ThreadRegistry()),
safepoint_handler_(new SafepointHandler(this)),
random_(),
mutex_(NOT_IN_PRODUCT("Isolate::mutex_")),
symbols_mutex_(NOT_IN_PRODUCT("Isolate::symbols_mutex_")),
type_canonicalization_mutex_(
NOT_IN_PRODUCT("Isolate::type_canonicalization_mutex_")),
constant_canonicalization_mutex_(
NOT_IN_PRODUCT("Isolate::constant_canonicalization_mutex_")),
megamorphic_lookup_mutex_(
NOT_IN_PRODUCT("Isolate::megamorphic_lookup_mutex_")),
kernel_data_lib_cache_mutex_(
NOT_IN_PRODUCT("Isolate::kernel_data_lib_cache_mutex_")),
kernel_data_class_cache_mutex_(
NOT_IN_PRODUCT("Isolate::kernel_data_class_cache_mutex_")),
kernel_constants_mutex_(
NOT_IN_PRODUCT("Isolate::kernel_constants_mutex_")),
pending_deopts_(new MallocGrowableArray<PendingLazyDeopt>()),
tag_table_(GrowableObjectArray::null()),
deoptimized_code_array_(GrowableObjectArray::null()),
sticky_error_(Error::null()),
reloaded_kernel_blobs_(GrowableObjectArray::null()),
field_list_mutex_(NOT_IN_PRODUCT("Isolate::field_list_mutex_")),
boxed_field_list_(GrowableObjectArray::null()),
spawn_count_monitor_(),
handler_info_cache_(),
catch_entry_moves_cache_() {
FlagsCopyFrom(api_flags);
SetErrorsFatal(true);
set_compilation_allowed(true);
// TODO(asiva): A Thread is not available here, need to figure out
// how the vm_tag (kEmbedderTagId) can be set, these tags need to
// move to the OSThread structure.
set_user_tag(UserTags::kDefaultUserTag);
if (obfuscate()) {
OS::PrintErr(
"Warning: This VM has been configured to obfuscate symbol information "
"which violates the Dart standard.\n"
" See dartbug.com/30524 for more information.\n");
}
if (FLAG_enable_interpreter) {
NOT_IN_PRECOMPILED(background_compiler_ = new BackgroundCompiler(this));
}
NOT_IN_PRECOMPILED(optimizing_background_compiler_ =
new BackgroundCompiler(this));
}
#undef REUSABLE_HANDLE_SCOPE_INIT
#undef REUSABLE_HANDLE_INITIALIZERS
Isolate::~Isolate() {
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
// TODO(32796): Re-enable assertion.
// RELEASE_ASSERT(reload_context_ == NULL);
#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
delete reverse_pc_lookup_cache_;
reverse_pc_lookup_cache_ = nullptr;
if (FLAG_enable_interpreter) {
delete background_compiler_;
background_compiler_ = nullptr;
}
delete optimizing_background_compiler_;
optimizing_background_compiler_ = nullptr;
#if !defined(PRODUCT)
delete debugger_;
debugger_ = nullptr;
if (FLAG_support_service) {
delete object_id_ring_;
}
object_id_ring_ = nullptr;
delete pause_loop_monitor_;
pause_loop_monitor_ = nullptr;
#endif // !defined(PRODUCT)
free(name_);
delete store_buffer_;
delete heap_;
ASSERT(marking_stack_ == nullptr);
delete object_store_;
delete api_state_;
#if defined(USING_SIMULATOR)
delete simulator_;
#endif
delete pending_deopts_;
pending_deopts_ = nullptr;
delete message_handler_;
message_handler_ =
nullptr; // Fail fast if we send messages to a dead isolate.
ASSERT(deopt_context_ ==
nullptr); // No deopt in progress when isolate deleted.
delete spawn_state_;
ASSERT(spawn_count_ == 0);
delete safepoint_handler_;
delete thread_registry_;
if (obfuscation_map_ != nullptr) {
for (intptr_t i = 0; obfuscation_map_[i] != nullptr; i++) {
delete[] obfuscation_map_[i];
}
delete[] obfuscation_map_;
}
if (embedder_entry_points_ != nullptr) {
for (intptr_t i = 0; embedder_entry_points_[i].function_name != nullptr;
i++) {
free(const_cast<char*>(embedder_entry_points_[i].library_uri));
free(const_cast<char*>(embedder_entry_points_[i].class_name));
free(const_cast<char*>(embedder_entry_points_[i].function_name));
}
delete[] embedder_entry_points_;
}
}
void Isolate::InitVM() {
create_callback_ = nullptr;
if (isolates_list_monitor_ == nullptr) {
isolates_list_monitor_ = new Monitor();
}
ASSERT(isolates_list_monitor_ != nullptr);
EnableIsolateCreation();
}
Isolate* Isolate::InitIsolate(const char* name_prefix,
const Dart_IsolateFlags& api_flags,
bool is_vm_isolate) {
Isolate* result = new Isolate(api_flags);
ASSERT(result != nullptr);
#if !defined(PRODUCT)
// Initialize metrics.
#define ISOLATE_METRIC_INIT(type, variable, name, unit) \
result->metric_##variable##_.InitInstance(result, name, NULL, Metric::unit);
ISOLATE_METRIC_LIST(ISOLATE_METRIC_INIT);
#undef ISOLATE_METRIC_INIT
#endif // !defined(PRODUCT)
bool is_service_or_kernel_isolate = false;
if (ServiceIsolate::NameEquals(name_prefix)) {
ASSERT(!ServiceIsolate::Exists());
is_service_or_kernel_isolate = true;
}
#if !defined(DART_PRECOMPILED_RUNTIME)
if (KernelIsolate::NameEquals(name_prefix)) {
ASSERT(!KernelIsolate::Exists());
KernelIsolate::SetKernelIsolate(result);
is_service_or_kernel_isolate = true;
}
#endif // !defined(DART_PRECOMPILED_RUNTIME)
Heap::Init(result,
is_vm_isolate
? 0 // New gen size 0; VM isolate should only allocate in old.
: FLAG_new_gen_semi_max_size * MBInWords,
(is_service_or_kernel_isolate ? kDefaultMaxOldGenHeapSize
: FLAG_old_gen_heap_size) *
MBInWords);
// TODO(5411455): For now just set the recently created isolate as
// the current isolate.
if (!Thread::EnterIsolate(result)) {
// We failed to enter the isolate, it is possible the VM is shutting down,
// return back a NULL so that CreateIsolate reports back an error.
if (KernelIsolate::IsKernelIsolate(result)) {
KernelIsolate::SetKernelIsolate(nullptr);
}
if (ServiceIsolate::IsServiceIsolate(result)) {
ServiceIsolate::SetServiceIsolate(nullptr);
}
delete result;
return nullptr;
}
// Setup the isolate message handler.
MessageHandler* handler = new IsolateMessageHandler(result);
ASSERT(handler != nullptr);
result->set_message_handler(handler);
// Setup the Dart API state.
ApiState* state = new ApiState();
ASSERT(state != nullptr);
result->set_api_state(state);
result->set_main_port(PortMap::CreatePort(result->message_handler()));
#if defined(DEBUG)
// Verify that we are never reusing a live origin id.
VerifyOriginId id_verifier(result->main_port());
Isolate::VisitIsolates(&id_verifier);
#endif
result->set_origin_id(result->main_port());
result->set_pause_capability(result->random()->NextUInt64());
result->set_terminate_capability(result->random()->NextUInt64());
result->BuildName(name_prefix);
#if !defined(PRODUCT)
result->debugger_ = new Debugger(result);
#endif
if (FLAG_trace_isolates) {
if (name_prefix == nullptr || strcmp(name_prefix, "vm-isolate") != 0) {
OS::PrintErr(
"[+] Starting isolate:\n"
"\tisolate: %s\n",
result->name());
}
}
#ifndef PRODUCT
if (FLAG_support_service) {
ObjectIdRing::Init(result);
}
#endif // !PRODUCT
// Add to isolate list. Shutdown and delete the isolate on failure.
if (!AddIsolateToList(result)) {
result->LowLevelShutdown();
Thread::ExitIsolate();
if (KernelIsolate::IsKernelIsolate(result)) {
KernelIsolate::SetKernelIsolate(nullptr);
}
if (ServiceIsolate::IsServiceIsolate(result)) {
ServiceIsolate::SetServiceIsolate(nullptr);
}
delete result;
return nullptr;
}
return result;
}
void Isolate::RetainKernelBlob(const ExternalTypedData& kernel_blob) {
if (reloaded_kernel_blobs_ == Object::null()) {
reloaded_kernel_blobs_ = GrowableObjectArray::New();
}
auto& kernel_blobs = GrowableObjectArray::Handle(reloaded_kernel_blobs_);
kernel_blobs.Add(kernel_blob);
}
Thread* Isolate::mutator_thread() const {
ASSERT(thread_registry() != nullptr);
return thread_registry()->mutator_thread();
}
RawObject* Isolate::CallTagHandler(Dart_LibraryTag tag,
const Object& arg1,
const Object& arg2) {
Thread* thread = Thread::Current();
Api::Scope api_scope(thread);
Dart_Handle api_arg1 = Api::NewHandle(thread, arg1.raw());
Dart_Handle api_arg2 = Api::NewHandle(thread, arg2.raw());
Dart_Handle api_result;
{
TransitionVMToNative transition(thread);
api_result = library_tag_handler_(tag, api_arg1, api_arg2);
}
return Api::UnwrapHandle(api_result);
}
void Isolate::SetupImagePage(const uint8_t* image_buffer, bool is_executable) {
Image image(image_buffer);
heap_->SetupImagePage(image.object_start(), image.object_size(),
is_executable);
}
void Isolate::ScheduleInterrupts(uword interrupt_bits) {
// We take the threads lock here to ensure that the mutator thread does not
// exit the isolate while we are trying to schedule interrupts on it.
MonitorLocker ml(threads_lock());
Thread* mthread = mutator_thread();
if (mthread != nullptr) {
mthread->ScheduleInterrupts(interrupt_bits);
}
}
void Isolate::set_name(const char* name) {
free(name_);
name_ = strdup(name);
}
int64_t Isolate::UptimeMicros() const {
return OS::GetCurrentMonotonicMicros() - start_time_micros_;
}
bool Isolate::IsPaused() const {
#if defined(PRODUCT)
return false;
#else
return (debugger_ != nullptr) && (debugger_->PauseEvent() != nullptr);
#endif // !defined(PRODUCT)
}
RawError* Isolate::PausePostRequest() {
#if !defined(PRODUCT)
if (debugger_ == nullptr) {
return Error::null();
}
ASSERT(!IsPaused());
const Error& error = Error::Handle(debugger_->PausePostRequest());
if (!error.IsNull()) {
if (Thread::Current()->top_exit_frame_info() == 0) {
return error.raw();
} else {
Exceptions::PropagateError(error);
UNREACHABLE();
}
}
#endif
return Error::null();
}
void Isolate::BuildName(const char* name_prefix) {
ASSERT(name_ == nullptr);
if (name_prefix == nullptr) {
name_ = OS::SCreate(nullptr, "isolate-%" Pd64 "", main_port());
} else {
name_ = strdup(name_prefix);
}
}
void Isolate::DoneLoading() {
GrowableObjectArray& libs =
GrowableObjectArray::Handle(current_zone(), object_store()->libraries());
Library& lib = Library::Handle(current_zone());
intptr_t num_libs = libs.Length();
for (intptr_t i = 0; i < num_libs; i++) {
lib ^= libs.At(i);
// If this library was loaded with Dart_LoadLibrary, it was marked
// as 'load in progres'. Set the status to 'loaded'.
if (lib.LoadInProgress()) {
lib.SetLoaded();
}
}
}
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
bool Isolate::CanReload() const {
return !Isolate::IsVMInternalIsolate(this) && is_runnable() &&
!IsReloading() &&
(AtomicOperations::LoadRelaxed(&no_reload_scope_depth_) == 0) &&
IsolateCreationEnabled() &&
OSThread::Current()->HasStackHeadroom(64 * KB);
}
bool Isolate::ReloadSources(JSONStream* js,
bool force_reload,
const char* root_script_url,
const char* packages_url,
bool dont_delete_reload_context) {
ASSERT(!IsReloading());
SetHasAttemptedReload(true);
reload_context_ = new IsolateReloadContext(this, js);
reload_context_->Reload(force_reload, root_script_url, packages_url,
/* kernel_buffer= */ nullptr,
/* kernel_buffer_size= */ 0);
bool success = !reload_context_->reload_aborted();
if (!dont_delete_reload_context) {
DeleteReloadContext();
}
return success;
}
bool Isolate::ReloadKernel(JSONStream* js,
bool force_reload,
const uint8_t* kernel_buffer,
intptr_t kernel_buffer_size,
bool dont_delete_reload_context) {
ASSERT(!IsReloading());
SetHasAttemptedReload(true);
reload_context_ = new IsolateReloadContext(this, js);
reload_context_->Reload(force_reload,
/* root_script_url= */ nullptr,
/* packages_url= */ nullptr, kernel_buffer,
kernel_buffer_size);
bool success = !reload_context_->reload_aborted();
if (!dont_delete_reload_context) {
DeleteReloadContext();
}
return success;
}
void Isolate::DeleteReloadContext() {
// Another thread may be in the middle of GetClassForHeapWalkAt.
Thread* thread = Thread::Current();
SafepointOperationScope safepoint_scope(thread);
delete reload_context_;
reload_context_ = nullptr;
}
#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
void Isolate::DoneFinalizing() {
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
if (IsReloading()) {
reload_context_->FinalizeLoading();
}
#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
}
const char* Isolate::MakeRunnable() {
ASSERT(Isolate::Current() == nullptr);
MutexLocker ml(&mutex_);
// Check if we are in a valid state to make the isolate runnable.
if (is_runnable() == true) {
return "Isolate is already runnable";
}
// Set the isolate as runnable and if we are being spawned schedule
// isolate on thread pool for execution.
ASSERT(object_store()->root_library() != Library::null());
set_is_runnable(true);
#ifndef PRODUCT
if (!Isolate::IsVMInternalIsolate(this)) {
debugger()->OnIsolateRunnable();
if (FLAG_pause_isolates_on_unhandled_exceptions) {
debugger()->SetExceptionPauseInfo(kPauseOnUnhandledExceptions);
}
}
#endif // !PRODUCT
IsolateSpawnState* state = spawn_state();
if (state != nullptr) {
ASSERT(this == state->isolate());
Run();
}
#if defined(SUPPORT_TIMELINE)
TimelineStream* stream = Timeline::GetIsolateStream();
ASSERT(stream != nullptr);
TimelineEvent* event = stream->StartEvent();
if (event != nullptr) {
event->Instant("Runnable");
event->Complete();
}
#endif
#ifndef PRODUCT
if (FLAG_support_service && !Isolate::IsVMInternalIsolate(this) &&
Service::isolate_stream.enabled()) {
ServiceEvent runnableEvent(this, ServiceEvent::kIsolateRunnable);
Service::HandleEvent(&runnableEvent);
}
GetRunnableLatencyMetric()->set_value(UptimeMicros());
if (FLAG_print_benchmarking_metrics) {
{
StartIsolateScope scope(this);
heap()->CollectAllGarbage();
}
int64_t heap_size = (heap()->UsedInWords(Heap::kNew) * kWordSize) +
(heap()->UsedInWords(Heap::kOld) * kWordSize);
GetRunnableHeapSizeMetric()->set_value(heap_size);
}
#endif // !PRODUCT
return nullptr;
}
bool Isolate::VerifyPauseCapability(const Object& capability) const {
return !capability.IsNull() && capability.IsCapability() &&
(pause_capability() == Capability::Cast(capability).Id());
}
bool Isolate::VerifyTerminateCapability(const Object& capability) const {
return !capability.IsNull() && capability.IsCapability() &&
(terminate_capability() == Capability::Cast(capability).Id());
}
bool Isolate::AddResumeCapability(const Capability& capability) {
// Ensure a limit for the number of resume capabilities remembered.
static const intptr_t kMaxResumeCapabilities =
compiler::target::kSmiMax / (6 * kWordSize);
const GrowableObjectArray& caps = GrowableObjectArray::Handle(
current_zone(), object_store()->resume_capabilities());
Capability& current = Capability::Handle(current_zone());
intptr_t insertion_index = -1;
for (intptr_t i = 0; i < caps.Length(); i++) {
current ^= caps.At(i);
if (current.IsNull()) {
if (insertion_index < 0) {
insertion_index = i;
}
} else if (current.Id() == capability.Id()) {
return false;
}
}
if (insertion_index < 0) {
if (caps.Length() >= kMaxResumeCapabilities) {
// Cannot grow the array of resume capabilities beyond its max. Additional
// pause requests are ignored. In practice will never happen as we will
// run out of memory beforehand.
return false;
}
caps.Add(capability);
} else {
caps.SetAt(insertion_index, capability);
}
return true;
}
bool Isolate::RemoveResumeCapability(const Capability& capability) {
const GrowableObjectArray& caps = GrowableObjectArray::Handle(
current_zone(), object_store()->resume_capabilities());
Capability& current = Capability::Handle(current_zone());
for (intptr_t i = 0; i < caps.Length(); i++) {
current ^= caps.At(i);
if (!current.IsNull() && (current.Id() == capability.Id())) {
// Remove the matching capability from the list.
current = Capability::null();
caps.SetAt(i, current);
return true;
}
}
return false;
}
// TODO(iposva): Remove duplicated code and start using some hash based
// structure instead of these linear lookups.
void Isolate::AddExitListener(const SendPort& listener,
const Instance& response) {
// Ensure a limit for the number of listeners remembered.
static const intptr_t kMaxListeners =
compiler::target::kSmiMax / (12 * kWordSize);
const GrowableObjectArray& listeners = GrowableObjectArray::Handle(
current_zone(), object_store()->exit_listeners());
SendPort& current = SendPort::Handle(current_zone());
intptr_t insertion_index = -1;
for (intptr_t i = 0; i < listeners.Length(); i += 2) {
current ^= listeners.At(i);
if (current.IsNull()) {
if (insertion_index < 0) {
insertion_index = i;
}
} else if (current.Id() == listener.Id()) {
listeners.SetAt(i + 1, response);
return;
}
}
if (insertion_index < 0) {
if (listeners.Length() >= kMaxListeners) {
// Cannot grow the array of listeners beyond its max. Additional
// listeners are ignored. In practice will never happen as we will
// run out of memory beforehand.
return;
}
listeners.Add(listener);
listeners.Add(response);
} else {
listeners.SetAt(insertion_index, listener);
listeners.SetAt(insertion_index + 1, response);
}
}
void Isolate::RemoveExitListener(const SendPort& listener) {
const GrowableObjectArray& listeners = GrowableObjectArray::Handle(
current_zone(), object_store()->exit_listeners());
SendPort& current = SendPort::Handle(current_zone());
for (intptr_t i = 0; i < listeners.Length(); i += 2) {
current ^= listeners.At(i);
if (!current.IsNull() && (current.Id() == listener.Id())) {
// Remove the matching listener from the list.
current = SendPort::null();
listeners.SetAt(i, current);
listeners.SetAt(i + 1, Object::null_instance());
return;
}
}
}
void Isolate::NotifyExitListeners() {
const GrowableObjectArray& listeners = GrowableObjectArray::Handle(
current_zone(), this->object_store()->exit_listeners());
if (listeners.IsNull()) return;
SendPort& listener = SendPort::Handle(current_zone());
Instance& response = Instance::Handle(current_zone());
for (intptr_t i = 0; i < listeners.Length(); i += 2) {
listener ^= listeners.At(i);
if (!listener.IsNull()) {
Dart_Port port_id = listener.Id();
response ^= listeners.At(i + 1);
PortMap::PostMessage(SerializeMessage(port_id, response));
}
}
}
void Isolate::AddErrorListener(const SendPort& listener) {
// Ensure a limit for the number of listeners remembered.
static const intptr_t kMaxListeners =
compiler::target::kSmiMax / (6 * kWordSize);
const GrowableObjectArray& listeners = GrowableObjectArray::Handle(
current_zone(), object_store()->error_listeners());
SendPort& current = SendPort::Handle(current_zone());
intptr_t insertion_index = -1;
for (intptr_t i = 0; i < listeners.Length(); i++) {
current ^= listeners.At(i);
if (current.IsNull()) {
if (insertion_index < 0) {
insertion_index = i;
}
} else if (current.Id() == listener.Id()) {
return;
}
}
if (insertion_index < 0) {
if (listeners.Length() >= kMaxListeners) {
// Cannot grow the array of listeners beyond its max. Additional
// listeners are ignored. In practice will never happen as we will
// run out of memory beforehand.
return;
}
listeners.Add(listener);
} else {
listeners.SetAt(insertion_index, listener);
}
}
void Isolate::RemoveErrorListener(const SendPort& listener) {
const GrowableObjectArray& listeners = GrowableObjectArray::Handle(
current_zone(), object_store()->error_listeners());
SendPort& current = SendPort::Handle(current_zone());
for (intptr_t i = 0; i < listeners.Length(); i++) {
current ^= listeners.At(i);
if (!current.IsNull() && (current.Id() == listener.Id())) {
// Remove the matching listener from the list.
current = SendPort::null();
listeners.SetAt(i, current);
return;
}
}
}
bool Isolate::NotifyErrorListeners(const String& msg,
const String& stacktrace) {
const GrowableObjectArray& listeners = GrowableObjectArray::Handle(
current_zone(), this->object_store()->error_listeners());
if (listeners.IsNull()) return false;
const Array& arr = Array::Handle(current_zone(), Array::New(2));
arr.SetAt(0, msg);
arr.SetAt(1, stacktrace);
SendPort& listener = SendPort::Handle(current_zone());
for (intptr_t i = 0; i < listeners.Length(); i++) {
listener ^= listeners.At(i);
if (!listener.IsNull()) {
Dart_Port port_id = listener.Id();
PortMap::PostMessage(SerializeMessage(port_id, arr));
}
}
return listeners.Length() > 0;
}
static MessageHandler::MessageStatus RunIsolate(uword parameter) {
Isolate* isolate = reinterpret_cast<Isolate*>(parameter);
IsolateSpawnState* state = nullptr;
{
// TODO(turnidge): Is this locking required here at all anymore?
MutexLocker ml(isolate->mutex());
state = isolate->spawn_state();
}
{
StartIsolateScope start_scope(isolate);
Thread* thread = Thread::Current();
ASSERT(thread->isolate() == isolate);
StackZone zone(thread);
HandleScope handle_scope(thread);
// If particular values were requested for this newly spawned isolate, then
// they are set here before the isolate starts executing user code.
isolate->SetErrorsFatal(state->errors_are_fatal());
if (state->on_exit_port() != ILLEGAL_PORT) {
const SendPort& listener =
SendPort::Handle(SendPort::New(state->on_exit_port()));
isolate->AddExitListener(listener, Instance::null_instance());
}
if (state->on_error_port() != ILLEGAL_PORT) {
const SendPort& listener =
SendPort::Handle(SendPort::New(state->on_error_port()));
isolate->AddErrorListener(listener);
}
// Switch back to spawning isolate.
if (!ClassFinalizer::ProcessPendingClasses()) {
// Error is in sticky error already.
#if defined(DEBUG)
const Error& error = Error::Handle(thread->sticky_error());
ASSERT(!error.IsUnwindError());
#endif
return MessageHandler::kError;
}
Object& result = Object::Handle();
result = state->ResolveFunction();
bool is_spawn_uri = state->is_spawn_uri();
if (result.IsError()) {
return StoreError(thread, Error::Cast(result));
}
ASSERT(result.IsFunction());
Function& func = Function::Handle(thread->zone());
func ^= result.raw();
func = func.ImplicitClosureFunction();
const Array& capabilities = Array::Handle(Array::New(2));
Capability& capability = Capability::Handle();
capability = Capability::New(isolate->pause_capability());
capabilities.SetAt(0, capability);
// Check whether this isolate should be started in paused state.
if (state->paused()) {
bool added = isolate->AddResumeCapability(capability);
ASSERT(added); // There should be no pending resume capabilities.
isolate->message_handler()->increment_paused();
}
capability = Capability::New(isolate->terminate_capability());
capabilities.SetAt(1, capability);
// Instead of directly invoking the entry point we call '_startIsolate' with
// the entry point as argument.
// Since this function ("RunIsolate") is used for both Isolate.spawn and
// Isolate.spawnUri we also send a boolean flag as argument so that the
// "_startIsolate" function can act corresponding to how the isolate was
// created.
const Array& args = Array::Handle(Array::New(7));
args.SetAt(0, SendPort::Handle(SendPort::New(state->parent_port())));
args.SetAt(1, Instance::Handle(func.ImplicitStaticClosure()));
args.SetAt(2, Instance::Handle(state->BuildArgs(thread)));
args.SetAt(3, Instance::Handle(state->BuildMessage(thread)));
args.SetAt(4, is_spawn_uri ? Bool::True() : Bool::False());
args.SetAt(5, ReceivePort::Handle(ReceivePort::New(
isolate->main_port(), true /* control port */)));
args.SetAt(6, capabilities);
const Library& lib = Library::Handle(Library::IsolateLibrary());
const String& entry_name = String::Handle(String::New("_startIsolate"));
const Function& entry_point =
Function::Handle(lib.LookupLocalFunction(entry_name));
ASSERT(entry_point.IsFunction() && !entry_point.IsNull());
result = DartEntry::InvokeFunction(entry_point, args);
if (result.IsError()) {
return StoreError(thread, Error::Cast(result));
}
}
return MessageHandler::kOK;
}
static void ShutdownIsolate(uword parameter) {
Isolate* isolate = reinterpret_cast<Isolate*>(parameter);
// We must wait for any outstanding spawn calls to complete before
// running the shutdown callback.
isolate->WaitForOutstandingSpawns();
{
// Print the error if there is one. This may execute dart code to
// print the exception object, so we need to use a StartIsolateScope.
StartIsolateScope start_scope(isolate);
Thread* thread = Thread::Current();
ASSERT(thread->isolate() == isolate);
StackZone zone(thread);
HandleScope handle_scope(thread);
#if defined(DEBUG)
isolate->ValidateConstants();
#endif // defined(DEBUG)
Dart::RunShutdownCallback();
}
// Shut the isolate down.
Dart::ShutdownIsolate(isolate);
}
void Isolate::SetStickyError(RawError* sticky_error) {
ASSERT(
((sticky_error_ == Error::null()) || (sticky_error == Error::null())) &&
(sticky_error != sticky_error_));
sticky_error_ = sticky_error;
}
void Isolate::Run() {
message_handler()->Run(Dart::thread_pool(), RunIsolate, ShutdownIsolate,
reinterpret_cast<uword>(this));
}
void Isolate::NotifyIdle(int64_t deadline) {
heap()->NotifyIdle(deadline);
}
void Isolate::AddClosureFunction(const Function& function) const {
ASSERT(!Compiler::IsBackgroundCompilation());
GrowableObjectArray& closures =
GrowableObjectArray::Handle(object_store()->closure_functions());
ASSERT(!closures.IsNull());
ASSERT(function.IsNonImplicitClosureFunction());
closures.Add(function, Heap::kOld);
}
// If the linear lookup turns out to be too expensive, the list
// of closures could be maintained in a hash map, with the key
// being the token position of the closure. There are almost no
// collisions with this simple hash value. However, iterating over
// all closure functions becomes more difficult, especially when
// the list/map changes while iterating over it.
RawFunction* Isolate::LookupClosureFunction(const Function& parent,
TokenPosition token_pos) const {
const GrowableObjectArray& closures =
GrowableObjectArray::Handle(object_store()->closure_functions());
ASSERT(!closures.IsNull());
Function& closure = Function::Handle();
intptr_t num_closures = closures.Length();
for (intptr_t i = 0; i < num_closures; i++) {
closure ^= closures.At(i);
if ((closure.token_pos() == token_pos) &&
(closure.parent_function() == parent.raw())) {
return closure.raw();
}
}
return Function::null();
}
intptr_t Isolate::FindClosureIndex(const Function& needle) const {
const GrowableObjectArray& closures_array =
GrowableObjectArray::Handle(object_store()->closure_functions());
intptr_t num_closures = closures_array.Length();
for (intptr_t i = 0; i < num_closures; i++) {
if (closures_array.At(i) == needle.raw()) {
return i;
}
}
return -1;
}
RawFunction* Isolate::ClosureFunctionFromIndex(intptr_t idx) const {
const GrowableObjectArray& closures_array =
GrowableObjectArray::Handle(object_store()->closure_functions());
if ((idx < 0) || (idx >= closures_array.Length())) {
return Function::null();
}
return Function::RawCast(closures_array.At(idx));
}
class FinalizeWeakPersistentHandlesVisitor : public HandleVisitor {
public:
FinalizeWeakPersistentHandlesVisitor() : HandleVisitor(Thread::Current()) {}
void VisitHandle(uword addr) {
FinalizablePersistentHandle* handle =
reinterpret_cast<FinalizablePersistentHandle*>(addr);
handle->UpdateUnreachable(thread()->isolate());
}
private:
DISALLOW_COPY_AND_ASSIGN(FinalizeWeakPersistentHandlesVisitor);
};
// static
void Isolate::NotifyLowMemory() {
Isolate::KillAllIsolates(Isolate::kLowMemoryMsg);
}
void Isolate::LowLevelShutdown() {
// Ensure we have a zone and handle scope so that we can call VM functions,
// but we no longer allocate new heap objects.
Thread* thread = Thread::Current();
StackZone stack_zone(thread);
HandleScope handle_scope(thread);
NoSafepointScope no_safepoint_scope;
// Notify exit listeners that this isolate is shutting down.
if (object_store() != nullptr) {
const Error& error = Error::Handle(thread->sticky_error());
if (error.IsNull() || !error.IsUnwindError() ||
UnwindError::Cast(error).is_user_initiated()) {
NotifyExitListeners();
}
}
#if !defined(PRODUCT)
// Clean up debugger resources.
debugger()->Shutdown();
#endif
// Close all the ports owned by this isolate.
PortMap::ClosePorts(message_handler());
// Fail fast if anybody tries to post any more messages to this isolate.
delete message_handler();
set_message_handler(nullptr);
#if defined(SUPPORT_TIMELINE)
// Before analyzing the isolate's timeline blocks- reclaim all cached
// blocks.
Timeline::ReclaimCachedBlocksFromThreads();
#endif
// Dump all timing data for the isolate.
#if defined(SUPPORT_TIMELINE) && !defined(PRODUCT)
if (FLAG_timing) {
TimelinePauseTrace tpt;
tpt.Print();
}
#endif // !PRODUCT
// Finalize any weak persistent handles with a non-null referent.
FinalizeWeakPersistentHandlesVisitor visitor;
api_state()->weak_persistent_handles().VisitHandles(&visitor);
#if !defined(PRODUCT)
if (FLAG_dump_megamorphic_stats) {
MegamorphicCacheTable::PrintSizes(this);
}
if (FLAG_dump_symbol_stats) {
Symbols::DumpStats(this);
}
if (FLAG_trace_isolates) {
heap()->PrintSizes();
OS::PrintErr(
"[-] Stopping isolate:\n"
"\tisolate: %s\n",
name());
}
if (FLAG_print_metrics || FLAG_print_benchmarking_metrics) {
LogBlock lb;
OS::PrintErr("Printing metrics for %s\n", name());
#define ISOLATE_METRIC_PRINT(type, variable, name, unit) \
OS::PrintErr("%s\n", metric_##variable##_.ToString());
ISOLATE_METRIC_LIST(ISOLATE_METRIC_PRINT)
#undef ISOLATE_METRIC_PRINT
OS::PrintErr("\n");
}
#endif // !defined(PRODUCT)
}
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
void Isolate::MaybeIncreaseReloadEveryNStackOverflowChecks() {
if (FLAG_reload_every_back_off) {
if (reload_every_n_stack_overflow_checks_ < 5000) {
reload_every_n_stack_overflow_checks_ += 99;
} else {
reload_every_n_stack_overflow_checks_ *= 2;
}
// Cap the value.
if (reload_every_n_stack_overflow_checks_ > 1000000) {
reload_every_n_stack_overflow_checks_ = 1000000;
}
}
}
#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
void Isolate::Shutdown() {
ASSERT(this == Isolate::Current());
BackgroundCompiler::Stop(this);
if (FLAG_enable_interpreter) {
delete background_compiler_;
background_compiler_ = nullptr;
}
delete optimizing_background_compiler_;
optimizing_background_compiler_ = nullptr;
#if defined(DEBUG)
if (heap_ != nullptr && FLAG_verify_on_transition) {
// The VM isolate keeps all objects marked.
heap_->Verify(this == Dart::vm_isolate() ? kRequireMarked : kForbidMarked);
}
#endif // DEBUG
Thread* thread = Thread::Current();
// Don't allow anymore dart code to execution on this isolate.
thread->ClearStackLimit();
// Remove this isolate from the list *before* we start tearing it down, to
// avoid exposing it in a state of decay.
RemoveIsolateFromList(this);
{
// After removal from isolate list. Before tearing down the heap.
StackZone zone(thread);
HandleScope handle_scope(thread);
ServiceIsolate::SendIsolateShutdownMessage();
KernelIsolate::NotifyAboutIsolateShutdown(this);
}
if (heap_ != nullptr) {
// Wait for any concurrent GC tasks to finish before shutting down.
// TODO(rmacnak): Interrupt tasks for faster shutdown.
PageSpace* old_space = heap_->old_space();
MonitorLocker ml(old_space->tasks_lock());
while (old_space->tasks() > 0) {
ml.Wait();
}
// Needs to happen before ~PageSpace so TLS and the thread registery are
// still valid.
old_space->AbandonMarkingForShutdown();
}
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
if (FLAG_check_reloaded && is_runnable() &&
!Isolate::IsVMInternalIsolate(this)) {
if (!HasAttemptedReload()) {
FATAL(
"Isolate did not reload before exiting and "
"--check-reloaded is enabled.\n");
}
}
#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
// Then, proceed with low-level teardown.
LowLevelShutdown();
#if defined(DEBUG)
// No concurrent sweeper tasks should be running at this point.
if (heap_ != nullptr) {
PageSpace* old_space = heap_->old_space();
MonitorLocker ml(old_space->tasks_lock());
ASSERT(old_space->tasks() == 0);
}
#endif
// TODO(5411455): For now just make sure there are no current isolates
// as we are shutting down the isolate.
Thread::ExitIsolate();
Dart_IsolateCleanupCallback cleanup = Isolate::CleanupCallback();
if (cleanup != nullptr) {
cleanup(init_callback_data());
}
}
Dart_IsolateCreateCallback Isolate::create_callback_ = nullptr;
Dart_IsolateShutdownCallback Isolate::shutdown_callback_ = nullptr;
Dart_IsolateCleanupCallback Isolate::cleanup_callback_ = nullptr;
Monitor* Isolate::isolates_list_monitor_ = nullptr;
Isolate* Isolate::isolates_list_head_ = nullptr;
bool Isolate::creation_enabled_ = false;
void Isolate::VisitObjectPointers(ObjectPointerVisitor* visitor,
ValidationPolicy validate_frames) {
ASSERT(visitor != nullptr);
// 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 the dart api state for all local and persistent handles.
if (api_state() != nullptr) {
api_state()->VisitObjectPointers(visitor);
}
// Visit the objects directly referenced from the isolate structure.
visitor->VisitPointer(reinterpret_cast<RawObject**>(&current_tag_));
visitor->VisitPointer(reinterpret_cast<RawObject**>(&default_tag_));
visitor->VisitPointer(reinterpret_cast<RawObject**>(&ic_miss_code_));
visitor->VisitPointer(reinterpret_cast<RawObject**>(&tag_table_));
visitor->VisitPointer(
reinterpret_cast<RawObject**>(&deoptimized_code_array_));
visitor->VisitPointer(reinterpret_cast<RawObject**>(&sticky_error_));
visitor->VisitPointer(reinterpret_cast<RawObject**>(&reloaded_kernel_blobs_));
#if !defined(PRODUCT)
visitor->VisitPointer(
reinterpret_cast<RawObject**>(&pending_service_extension_calls_));
visitor->VisitPointer(
reinterpret_cast<RawObject**>(&registered_service_extension_handlers_));
#endif // !defined(PRODUCT)
// Visit the boxed_field_list_.
// 'boxed_field_list_' access via mutator and background compilation threads
// is guarded with a monitor. This means that we can visit it only
// when at safepoint or the field_list_mutex_ lock has been taken.
visitor->VisitPointer(reinterpret_cast<RawObject**>(&boxed_field_list_));
if (background_compiler() != nullptr) {
background_compiler()->VisitPointers(visitor);
}
if (optimizing_background_compiler() != nullptr) {
optimizing_background_compiler()->VisitPointers(visitor);
}
#if !defined(PRODUCT)
// Visit objects in the debugger.
debugger()->VisitObjectPointers(visitor);
#if !defined(DART_PRECOMPILED_RUNTIME)
// Visit objects that are being used for isolate reload.
if (reload_context() != nullptr) {
reload_context()->VisitObjectPointers(visitor);
}
#endif // !defined(DART_PRECOMPILED_RUNTIME)
if (ServiceIsolate::IsServiceIsolate(this)) {
ServiceIsolate::VisitObjectPointers(visitor);
}
#endif // !defined(PRODUCT)
#if !defined(DART_PRECOMPILED_RUNTIME)
// Visit objects that are being used for deoptimization.
if (deopt_context() != nullptr) {
deopt_context()->VisitObjectPointers(visitor);
}
#endif // !defined(DART_PRECOMPILED_RUNTIME)
#if defined(TARGET_ARCH_DBC)
if (simulator() != nullptr) {
simulator()->VisitObjectPointers(visitor);
}
#endif // defined(TARGET_ARCH_DBC)
VisitStackPointers(visitor, validate_frames);
}
void Isolate::VisitStackPointers(ObjectPointerVisitor* visitor,
ValidationPolicy validate_frames) {
// Visit objects in all threads (e.g., Dart stack, handles in zones).
thread_registry()->VisitObjectPointers(visitor, validate_frames);
}
void Isolate::VisitWeakPersistentHandles(HandleVisitor* visitor) {
if (api_state() != nullptr) {
api_state()->VisitWeakHandles(visitor);
}
}
void Isolate::ReleaseStoreBuffers() {
thread_registry()->ReleaseStoreBuffers();
}
void Isolate::EnableIncrementalBarrier(MarkingStack* marking_stack,
MarkingStack* deferred_marking_stack) {
ASSERT(marking_stack_ == nullptr);
marking_stack_ = marking_stack;
deferred_marking_stack_ = deferred_marking_stack;
thread_registry()->AcquireMarkingStacks();
ASSERT(Thread::Current()->is_marking());
}
void Isolate::DisableIncrementalBarrier() {
thread_registry()->ReleaseMarkingStacks();
ASSERT(marking_stack_ != nullptr);
marking_stack_ = nullptr;
deferred_marking_stack_ = nullptr;
ASSERT(!Thread::Current()->is_marking());
}
RawClass* Isolate::GetClassForHeapWalkAt(intptr_t cid) {
RawClass* raw_class = nullptr;
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
if (IsReloading()) {
raw_class = reload_context()->GetClassForHeapWalkAt(cid);
} else {
raw_class = class_table()->At(cid);
}
#else
raw_class = class_table()->At(cid);
#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
ASSERT(raw_class != nullptr);
ASSERT(remapping_cids() || raw_class->ptr()->id_ == cid);
return raw_class;
}
intptr_t Isolate::GetClassSizeForHeapWalkAt(intptr_t cid) {
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
if (IsReloading()) {
return reload_context()->GetClassSizeForHeapWalkAt(cid);
} else {
return class_table()->SizeAt(cid);
}
#else
return class_table()->SizeAt(cid);
#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
}
void Isolate::AddPendingDeopt(uword fp, uword pc) {
// GrowableArray::Add is not atomic and may be interrupt by a profiler
// stack walk.
MallocGrowableArray<PendingLazyDeopt>* old_pending_deopts = pending_deopts_;
MallocGrowableArray<PendingLazyDeopt>* new_pending_deopts =
new MallocGrowableArray<PendingLazyDeopt>(old_pending_deopts->length() +
1);
for (intptr_t i = 0; i < old_pending_deopts->length(); i++) {
ASSERT((*old_pending_deopts)[i].fp() != fp);
new_pending_deopts->Add((*old_pending_deopts)[i]);
}
PendingLazyDeopt deopt(fp, pc);
new_pending_deopts->Add(deopt);
pending_deopts_ = new_pending_deopts;
delete old_pending_deopts;
}
uword Isolate::FindPendingDeopt(uword fp) const {
for (intptr_t i = 0; i < pending_deopts_->length(); i++) {
if ((*pending_deopts_)[i].fp() == fp) {
return (*pending_deopts_)[i].pc();
}
}
FATAL("Missing pending deopt entry");
return 0;
}
void Isolate::ClearPendingDeoptsAtOrBelow(uword fp) const {
for (intptr_t i = pending_deopts_->length() - 1; i >= 0; i--) {
if ((*pending_deopts_)[i].fp() <= fp) {
pending_deopts_->RemoveAt(i);
}
}
}
#ifndef PRODUCT
static const char* ExceptionPauseInfoToServiceEnum(Dart_ExceptionPauseInfo pi) {
switch (pi) {
case kPauseOnAllExceptions:
return "All";
case kNoPauseOnExceptions:
return "None";
case kPauseOnUnhandledExceptions:
return "Unhandled";
default:
UNIMPLEMENTED();
return nullptr;
}
}
void Isolate::PrintJSON(JSONStream* stream, bool ref) {
if (!FLAG_support_service) {
return;
}
JSONObject jsobj(stream);
jsobj.AddProperty("type", (ref ? "@Isolate" : "Isolate"));
jsobj.AddServiceId(ISOLATE_SERVICE_ID_FORMAT_STRING,
static_cast<int64_t>(main_port()));
jsobj.AddProperty("name", name());
jsobj.AddPropertyF("number", "%" Pd64 "", static_cast<int64_t>(main_port()));
if (ref) {
return;
}
jsobj.AddPropertyF("_originNumber", "%" Pd64 "",
static_cast<int64_t>(origin_id()));
int64_t uptime_millis = UptimeMicros() / kMicrosecondsPerMillisecond;
int64_t start_time = OS::GetCurrentTimeMillis() - uptime_millis;
jsobj.AddPropertyTimeMillis("startTime", start_time);
{
JSONObject jsheap(&jsobj, "_heaps");
heap()->PrintToJSONObject(Heap::kNew, &jsheap);
heap()->PrintToJSONObject(Heap::kOld, &jsheap);
}
jsobj.AddProperty("runnable", is_runnable());
jsobj.AddProperty("livePorts", message_handler()->live_ports());
jsobj.AddProperty("pauseOnExit", message_handler()->should_pause_on_exit());
#if !defined(DART_PRECOMPILED_RUNTIME)
jsobj.AddProperty("_isReloading", IsReloading());
#endif // !defined(DART_PRECOMPILED_RUNTIME)
if (!is_runnable()) {
// Isolate is not yet runnable.
ASSERT((debugger() == nullptr) || (debugger()->PauseEvent() == nullptr));
ServiceEvent pause_event(this, ServiceEvent::kNone);
jsobj.AddProperty("pauseEvent", &pause_event);
} else if (message_handler()->should_pause_on_start()) {
if (message_handler()->is_paused_on_start()) {
ASSERT((debugger() == nullptr) || (debugger()->PauseEvent() == nullptr));
ServiceEvent pause_event(this, ServiceEvent::kPauseStart);
jsobj.AddProperty("pauseEvent", &pause_event);
} else {
// Isolate is runnable but not paused on start.
// Some service clients get confused if they see:
// NotRunnable -> Runnable -> PausedAtStart
// Treat Runnable+ShouldPauseOnStart as NotRunnable so they see:
// NonRunnable -> PausedAtStart
// The should_pause_on_start flag is set to false after resume.
ASSERT((debugger() == nullptr) || (debugger()->PauseEvent() == nullptr));
ServiceEvent pause_event(this, ServiceEvent::kNone);
jsobj.AddProperty("pauseEvent", &pause_event);
}
} else if (message_handler()->is_paused_on_exit() &&
((debugger() == nullptr) ||
(debugger()->PauseEvent() == nullptr))) {
ServiceEvent pause_event(this, ServiceEvent::kPauseExit);
jsobj.AddProperty("pauseEvent", &pause_event);
} else if ((debugger() != nullptr) && (debugger()->PauseEvent() != nullptr) &&
!ResumeRequest()) {
jsobj.AddProperty("pauseEvent", debugger()->PauseEvent());
} else {
ServiceEvent pause_event(this, ServiceEvent::kResume);
if (debugger() != nullptr) {
// TODO(turnidge): Don't compute a full stack trace.
DebuggerStackTrace* stack = debugger()->StackTrace();
if (stack->Length() > 0) {
pause_event.set_top_frame(stack->FrameAt(0));
}
}
jsobj.AddProperty("pauseEvent", &pause_event);
}
const Library& lib = Library::Handle(object_store()->root_library());
if (!lib.IsNull()) {
jsobj.AddProperty("rootLib", lib);
}
intptr_t zone_handle_count = thread_registry_->CountZoneHandles();
intptr_t scoped_handle_count = thread_registry_->CountScopedHandles();
jsobj.AddProperty("_numZoneHandles", zone_handle_count);
jsobj.AddProperty("_numScopedHandles", scoped_handle_count);
if (FLAG_profiler) {
JSONObject tagCounters(&jsobj, "_tagCounters");
vm_tag_counters()->PrintToJSONObject(&tagCounters);
}
if (Thread::Current()->sticky_error() != Object::null()) {
Error& error = Error::Handle(Thread::Current()->sticky_error());
ASSERT(!error.IsNull());
jsobj.AddProperty("error", error, false);
} else if (sticky_error() != Object::null()) {
Error& error = Error::Handle(sticky_error());
ASSERT(!error.IsNull());
jsobj.AddProperty("error", error, false);
}
{
const GrowableObjectArray& libs =
GrowableObjectArray::Handle(object_store()->libraries());
intptr_t num_libs = libs.Length();
Library& lib = Library::Handle();
JSONArray lib_array(&jsobj, "libraries");
for (intptr_t i = 0; i < num_libs; i++) {
lib ^= libs.At(i);
ASSERT(!lib.IsNull());
lib_array.AddValue(lib);
}
}
{
JSONArray breakpoints(&jsobj, "breakpoints");
if (debugger() != nullptr) {
debugger()->PrintBreakpointsToJSONArray(&breakpoints);
}
}
Dart_ExceptionPauseInfo pause_info = (debugger() != nullptr)
? debugger()->GetExceptionPauseInfo()
: kNoPauseOnExceptions;
jsobj.AddProperty("exceptionPauseMode",
ExceptionPauseInfoToServiceEnum(pause_info));
if (debugger() != nullptr) {
JSONObject settings(&jsobj, "_debuggerSettings");
debugger()->PrintSettingsToJSONObject(&settings);
}
{
GrowableObjectArray& handlers =
GrowableObjectArray::Handle(registered_service_extension_handlers());
if (!handlers.IsNull()) {
JSONArray extensions(&jsobj, "extensionRPCs");
String& handler_name = String::Handle();
for (intptr_t i = 0; i < handlers.Length(); i += kRegisteredEntrySize) {
handler_name ^= handlers.At(i + kRegisteredNameIndex);
extensions.AddValue(handler_name.ToCString());
}
}
}
jsobj.AddProperty("_threads", thread_registry_);
}
void Isolate::PrintMemoryUsageJSON(JSONStream* stream) {
if (!FLAG_support_service) {
return;
}
heap()->PrintMemoryUsageJSON(stream);
}
#endif
void Isolate::set_tag_table(const GrowableObjectArray& value) {
tag_table_ = value.raw();
}
void Isolate::set_current_tag(const UserTag& tag) {
uword user_tag = tag.tag();
ASSERT(user_tag < kUwordMax);
set_user_tag(user_tag);
current_tag_ = tag.raw();
}
void Isolate::set_default_tag(const UserTag& tag) {
default_tag_ = tag.raw();
}
void Isolate::set_ic_miss_code(const Code& code) {
ic_miss_code_ = code.raw();
}
void Isolate::set_deoptimized_code_array(const GrowableObjectArray& value) {
ASSERT(Thread::Current()->IsMutatorThread());
deoptimized_code_array_ = value.raw();
}
void Isolate::TrackDeoptimizedCode(const Code& code) {
ASSERT(!code.IsNull());
const GrowableObjectArray& deoptimized_code =
GrowableObjectArray::Handle(deoptimized_code_array());
if (deoptimized_code.IsNull()) {
// Not tracking deoptimized code.
return;
}
// TODO(johnmccutchan): Scan this array and the isolate's profile before
// old space GC and remove the keep_code flag.
deoptimized_code.Add(code);
}
RawError* Isolate::StealStickyError() {
NoSafepointScope no_safepoint;
RawError* return_value = sticky_error_;
sticky_error_ = Error::null();
return return_value;
}
#if !defined(PRODUCT)
void Isolate::set_pending_service_extension_calls(
const GrowableObjectArray& value) {
pending_service_extension_calls_ = value.raw();
}
void Isolate::set_registered_service_extension_handlers(
const GrowableObjectArray& value) {
registered_service_extension_handlers_ = value.raw();
}
#endif // !defined(PRODUCT)
void Isolate::AddDeoptimizingBoxedField(const Field& field) {
ASSERT(Compiler::IsBackgroundCompilation());
ASSERT(!field.IsOriginal());
// The enclosed code allocates objects and can potentially trigger a GC,
// ensure that we account for safepoints when grabbing the lock.
SafepointMutexLocker ml(&field_list_mutex_);
if (boxed_field_list_ == GrowableObjectArray::null()) {
boxed_field_list_ = GrowableObjectArray::New(Heap::kOld);
}
const GrowableObjectArray& array =
GrowableObjectArray::Handle(boxed_field_list_);
array.Add(Field::Handle(field.Original()), Heap::kOld);
}
RawField* Isolate::GetDeoptimizingBoxedField() {
ASSERT(Thread::Current()->IsMutatorThread());
SafepointMutexLocker ml(&field_list_mutex_);
if (boxed_field_list_ == GrowableObjectArray::null()) {
return Field::null();
}
const GrowableObjectArray& array =
GrowableObjectArray::Handle(boxed_field_list_);
if (array.Length() == 0) {
return Field::null();
}
return Field::RawCast(array.RemoveLast());
}
#ifndef PRODUCT
RawError* Isolate::InvokePendingServiceExtensionCalls() {
if (!FLAG_support_service) {
return Error::null();
}
GrowableObjectArray& calls =
GrowableObjectArray::Handle(GetAndClearPendingServiceExtensionCalls());
if (calls.IsNull()) {
return Error::null();
}
// Grab run function.
const Library& developer_lib = Library::Handle(Library::DeveloperLibrary());
ASSERT(!developer_lib.IsNull());
const Function& run_extension = Function::Handle(
developer_lib.LookupLocalFunction(Symbols::_runExtension()));
ASSERT(!run_extension.IsNull());
const Array& arguments =
Array::Handle(Array::New(kPendingEntrySize + 1, Heap::kNew));
Object& result = Object::Handle();
String& method_name = String::Handle();
Instance& closure = Instance::Handle();
Array& parameter_keys = Array::Handle();
Array& parameter_values = Array::Handle();
Instance& reply_port = Instance::Handle();
Instance& id = Instance::Handle();
for (intptr_t i = 0; i < calls.Length(); i += kPendingEntrySize) {
// Grab arguments for call.
closure ^= calls.At(i + kPendingHandlerIndex);
ASSERT(!closure.IsNull());
arguments.SetAt(kPendingHandlerIndex, closure);
method_name ^= calls.At(i + kPendingMethodNameIndex);
ASSERT(!method_name.IsNull());
arguments.SetAt(kPendingMethodNameIndex, method_name);
parameter_keys ^= calls.At(i + kPendingKeysIndex);
ASSERT(!parameter_keys.IsNull());
arguments.SetAt(kPendingKeysIndex, parameter_keys);
parameter_values ^= calls.At(i + kPendingValuesIndex);
ASSERT(!parameter_values.IsNull());
arguments.SetAt(kPendingValuesIndex, parameter_values);
reply_port ^= calls.At(i + kPendingReplyPortIndex);
ASSERT(!reply_port.IsNull());
arguments.SetAt(kPendingReplyPortIndex, reply_port);
id ^= calls.At(i + kPendingIdIndex);
arguments.SetAt(kPendingIdIndex, id);
arguments.SetAt(kPendingEntrySize, Bool::Get(FLAG_trace_service));
if (FLAG_trace_service) {
OS::PrintErr("[+%" Pd64 "ms] Isolate %s invoking _runExtension for %s\n",
Dart::UptimeMillis(), name(), method_name.ToCString());
}
result = DartEntry::InvokeFunction(run_extension, arguments);
if (FLAG_trace_service) {
OS::PrintErr("[+%" Pd64 "ms] Isolate %s _runExtension complete for %s\n",
Dart::UptimeMillis(), name(), method_name.ToCString());
}
// Propagate the error.
if (result.IsError()) {
// Remaining service extension calls are dropped.
if (!result.IsUnwindError()) {
// Send error back over the protocol.
Service::PostError(method_name, parameter_keys, parameter_values,
reply_port, id, Error::Cast(result));
}
return Error::Cast(result).raw();
}
// Drain the microtask queue.
result = DartLibraryCalls::DrainMicrotaskQueue();
// Propagate the error.
if (result.IsError()) {
// Remaining service extension calls are dropped.
return Error::Cast(result).raw();
}
}
return Error::null();
}
RawGrowableObjectArray* Isolate::GetAndClearPendingServiceExtensionCalls() {
RawGrowableObjectArray* r = pending_service_extension_calls_;
pending_service_extension_calls_ = GrowableObjectArray::null();
return r;
}
void Isolate::AppendServiceExtensionCall(const Instance& closure,
const String& method_name,
const Array& parameter_keys,
const Array& parameter_values,
const Instance& reply_port,
const Instance& id) {
if (FLAG_trace_service) {
OS::PrintErr("[+%" Pd64
"ms] Isolate %s ENQUEUING request for extension %s\n",
Dart::UptimeMillis(), name(), method_name.ToCString());
}
GrowableObjectArray& calls =
GrowableObjectArray::Handle(pending_service_extension_calls());
bool schedule_drain = false;
if (calls.IsNull()) {
calls = GrowableObjectArray::New();
ASSERT(!calls.IsNull());
set_pending_service_extension_calls(calls);
schedule_drain = true;
}
ASSERT(kPendingHandlerIndex == 0);
calls.Add(closure);
ASSERT(kPendingMethodNameIndex == 1);
calls.Add(method_name);
ASSERT(kPendingKeysIndex == 2);
calls.Add(parameter_keys);
ASSERT(kPendingValuesIndex == 3);
calls.Add(parameter_values);
ASSERT(kPendingReplyPortIndex == 4);
calls.Add(reply_port);
ASSERT(kPendingIdIndex == 5);
calls.Add(id);
if (schedule_drain) {
const Array& msg = Array::Handle(Array::New(3));
Object& element = Object::Handle();
element = Smi::New(Message::kIsolateLibOOBMsg);
msg.SetAt(0, element);
element = Smi::New(Isolate::kDrainServiceExtensionsMsg);
msg.SetAt(1, element);
element = Smi::New(Isolate::kBeforeNextEventAction);
msg.SetAt(2, element);
MessageWriter writer(false);
std::unique_ptr<Message> message =
writer.WriteMessage(msg, main_port(), Message::kOOBPriority);
bool posted = PortMap::PostMessage(std::move(message));
ASSERT(posted);
}
}
// This function is written in C++ and not Dart because we must do this
// operation atomically in the face of random OOB messages. Do not port
// to Dart code unless you can ensure that the operations will can be
// done atomically.
void Isolate::RegisterServiceExtensionHandler(const String& name,
const Instance& closure) {
if (!FLAG_support_service || Isolate::IsVMInternalIsolate(this)) {
return;
}
GrowableObjectArray& handlers =
GrowableObjectArray::Handle(registered_service_extension_handlers());
if (handlers.IsNull()) {
handlers = GrowableObjectArray::New(Heap::kOld);
set_registered_service_extension_handlers(handlers);
}
#if defined(DEBUG)
{
// Sanity check.
const Instance& existing_handler =
Instance::Handle(LookupServiceExtensionHandler(name));
ASSERT(existing_handler.IsNull());
}
#endif
ASSERT(kRegisteredNameIndex == 0);
handlers.Add(name, Heap::kOld);
ASSERT(kRegisteredHandlerIndex == 1);
handlers.Add(closure, Heap::kOld);
{
// Fire off an event.
ServiceEvent event(this, ServiceEvent::kServiceExtensionAdded);
event.set_extension_rpc(&name);
Service::HandleEvent(&event);
}
}
// This function is written in C++ and not Dart because we must do this
// operation atomically in the face of random OOB messages. Do not port
// to Dart code unless you can ensure that the operations will can be
// done atomically.
RawInstance* Isolate::LookupServiceExtensionHandler(const String& name) {
if (!FLAG_support_service) {
return Instance::null();
}
const GrowableObjectArray& handlers =
GrowableObjectArray::Handle(registered_service_extension_handlers());
if (handlers.IsNull()) {
return Instance::null();
}
String& handler_name = String::Handle();
for (intptr_t i = 0; i < handlers.Length(); i += kRegisteredEntrySize) {
handler_name ^= handlers.At(i + kRegisteredNameIndex);
ASSERT(!handler_name.IsNull());
if (handler_name.Equals(name)) {
return Instance::RawCast(handlers.At(i + kRegisteredHandlerIndex));
}
}
return Instance::null();
}
void Isolate::WakePauseEventHandler(Dart_Isolate isolate) {
Isolate* iso =