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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "flutter/runtime/dart_isolate.h"
#include <cstdlib>
#include <tuple>
#include <utility>
#include "flutter/fml/logging.h"
#include "flutter/fml/posix_wrappers.h"
#include "flutter/fml/trace_event.h"
#include "flutter/lib/io/dart_io.h"
#include "flutter/lib/ui/dart_runtime_hooks.h"
#include "flutter/lib/ui/dart_ui.h"
#include "flutter/runtime/dart_isolate_group_data.h"
#include "flutter/runtime/dart_plugin_registrant.h"
#include "flutter/runtime/dart_service_isolate.h"
#include "flutter/runtime/dart_vm.h"
#include "flutter/runtime/dart_vm_lifecycle.h"
#include "flutter/runtime/isolate_configuration.h"
#include "fml/message_loop_task_queues.h"
#include "fml/task_source.h"
#include "fml/time/time_point.h"
#include "third_party/dart/runtime/include/dart_api.h"
#include "third_party/dart/runtime/include/dart_tools_api.h"
#include "third_party/tonic/converter/dart_converter.h"
#include "third_party/tonic/dart_class_library.h"
#include "third_party/tonic/dart_class_provider.h"
#include "third_party/tonic/dart_message_handler.h"
#include "third_party/tonic/dart_state.h"
#include "third_party/tonic/file_loader/file_loader.h"
#include "third_party/tonic/logging/dart_invoke.h"
#include "third_party/tonic/scopes/dart_api_scope.h"
#include "third_party/tonic/scopes/dart_isolate_scope.h"
namespace flutter {
namespace {
constexpr std::string_view kFileUriPrefix = "file://";
class DartErrorString {
public:
DartErrorString() {}
~DartErrorString() {
if (str_) {
::free(str_);
}
}
char** error() { return &str_; }
const char* str() const { return str_; }
explicit operator bool() const { return str_ != nullptr; }
private:
FML_DISALLOW_COPY_AND_ASSIGN(DartErrorString);
char* str_ = nullptr;
};
} // anonymous namespace
DartIsolate::Flags::Flags() : Flags(nullptr) {}
DartIsolate::Flags::Flags(const Dart_IsolateFlags* flags) {
if (flags) {
flags_ = *flags;
} else {
::Dart_IsolateFlagsInitialize(&flags_);
}
}
DartIsolate::Flags::~Flags() = default;
void DartIsolate::Flags::SetNullSafetyEnabled(bool enabled) {
flags_.null_safety = enabled;
}
void DartIsolate::Flags::SetIsDontNeedSafe(bool value) {
flags_.snapshot_is_dontneed_safe = value;
}
Dart_IsolateFlags DartIsolate::Flags::Get() const {
return flags_;
}
std::weak_ptr<DartIsolate> DartIsolate::CreateRunningRootIsolate(
const Settings& settings,
const fml::RefPtr<const DartSnapshot>& isolate_snapshot,
std::unique_ptr<PlatformConfiguration> platform_configuration,
Flags isolate_flags,
const fml::closure& root_isolate_create_callback,
const fml::closure& isolate_create_callback,
const fml::closure& isolate_shutdown_callback,
std::optional<std::string> dart_entrypoint,
std::optional<std::string> dart_entrypoint_library,
const std::vector<std::string>& dart_entrypoint_args,
std::unique_ptr<IsolateConfiguration> isolate_configuration,
const UIDartState::Context& context,
const DartIsolate* spawning_isolate) {
if (!isolate_snapshot) {
FML_LOG(ERROR) << "Invalid isolate snapshot.";
return {};
}
if (!isolate_configuration) {
FML_LOG(ERROR) << "Invalid isolate configuration.";
return {};
}
isolate_flags.SetNullSafetyEnabled(
isolate_configuration->IsNullSafetyEnabled(*isolate_snapshot));
isolate_flags.SetIsDontNeedSafe(isolate_snapshot->IsDontNeedSafe());
auto isolate = CreateRootIsolate(settings, //
isolate_snapshot, //
std::move(platform_configuration), //
isolate_flags, //
isolate_create_callback, //
isolate_shutdown_callback, //
context, //
spawning_isolate //
)
.lock();
if (!isolate) {
FML_LOG(ERROR) << "Could not create root isolate.";
return {};
}
fml::ScopedCleanupClosure shutdown_on_error([isolate]() {
if (!isolate->Shutdown()) {
FML_DLOG(ERROR) << "Could not shutdown transient isolate.";
}
});
if (isolate->GetPhase() != DartIsolate::Phase::LibrariesSetup) {
FML_LOG(ERROR) << "Root isolate was created in an incorrect phase: "
<< static_cast<int>(isolate->GetPhase());
return {};
}
if (!isolate_configuration->PrepareIsolate(*isolate.get())) {
FML_LOG(ERROR) << "Could not prepare isolate.";
return {};
}
if (isolate->GetPhase() != DartIsolate::Phase::Ready) {
FML_LOG(ERROR) << "Root isolate not in the ready phase for Dart entrypoint "
"invocation.";
return {};
}
if (settings.root_isolate_create_callback) {
// Isolate callbacks always occur in isolate scope and before user code has
// had a chance to run.
tonic::DartState::Scope scope(isolate.get());
settings.root_isolate_create_callback(*isolate.get());
}
if (root_isolate_create_callback) {
root_isolate_create_callback();
}
if (!isolate->RunFromLibrary(std::move(dart_entrypoint_library), //
std::move(dart_entrypoint), //
dart_entrypoint_args)) {
FML_LOG(ERROR) << "Could not run the run main Dart entrypoint.";
return {};
}
if (settings.root_isolate_shutdown_callback) {
isolate->AddIsolateShutdownCallback(
settings.root_isolate_shutdown_callback);
}
shutdown_on_error.Release();
return isolate;
}
void DartIsolate::SpawnIsolateShutdownCallback(
std::shared_ptr<DartIsolateGroupData>* isolate_group_data,
std::shared_ptr<DartIsolate>* isolate_data) {
DartIsolate::DartIsolateShutdownCallback(isolate_group_data, isolate_data);
}
std::weak_ptr<DartIsolate> DartIsolate::CreateRootIsolate(
const Settings& settings,
fml::RefPtr<const DartSnapshot> isolate_snapshot,
std::unique_ptr<PlatformConfiguration> platform_configuration,
const Flags& flags,
const fml::closure& isolate_create_callback,
const fml::closure& isolate_shutdown_callback,
const UIDartState::Context& context,
const DartIsolate* spawning_isolate) {
TRACE_EVENT0("flutter", "DartIsolate::CreateRootIsolate");
// The child isolate preparer is null but will be set when the isolate is
// being prepared to run.
auto isolate_group_data =
std::make_unique<std::shared_ptr<DartIsolateGroupData>>(
std::shared_ptr<DartIsolateGroupData>(new DartIsolateGroupData(
settings, // settings
std::move(isolate_snapshot), // isolate snapshot
context.advisory_script_uri, // advisory URI
context.advisory_script_entrypoint, // advisory entrypoint
nullptr, // child isolate preparer
isolate_create_callback, // isolate create callback
isolate_shutdown_callback // isolate shutdown callback
)));
auto isolate_data = std::make_unique<std::shared_ptr<DartIsolate>>(
std::shared_ptr<DartIsolate>(new DartIsolate(settings, // settings
true, // is_root_isolate
context // context
)));
DartErrorString error;
Dart_Isolate vm_isolate = nullptr;
auto isolate_flags = flags.Get();
IsolateMaker isolate_maker;
if (spawning_isolate) {
isolate_maker = [spawning_isolate](
std::shared_ptr<DartIsolateGroupData>*
isolate_group_data,
std::shared_ptr<DartIsolate>* isolate_data,
Dart_IsolateFlags* flags, char** error) {
return Dart_CreateIsolateInGroup(
/*group_member=*/spawning_isolate->isolate(),
/*name=*/(*isolate_group_data)->GetAdvisoryScriptEntrypoint().c_str(),
/*shutdown_callback=*/
reinterpret_cast<Dart_IsolateShutdownCallback>(
DartIsolate::SpawnIsolateShutdownCallback),
/*cleanup_callback=*/
reinterpret_cast<Dart_IsolateCleanupCallback>(
DartIsolateCleanupCallback),
/*child_isolate_data=*/isolate_data,
/*error=*/error);
};
} else {
isolate_maker = [](std::shared_ptr<DartIsolateGroupData>*
isolate_group_data,
std::shared_ptr<DartIsolate>* isolate_data,
Dart_IsolateFlags* flags, char** error) {
return Dart_CreateIsolateGroup(
(*isolate_group_data)->GetAdvisoryScriptURI().c_str(),
(*isolate_group_data)->GetAdvisoryScriptEntrypoint().c_str(),
(*isolate_group_data)->GetIsolateSnapshot()->GetDataMapping(),
(*isolate_group_data)->GetIsolateSnapshot()->GetInstructionsMapping(),
flags, isolate_group_data, isolate_data, error);
};
}
vm_isolate = CreateDartIsolateGroup(std::move(isolate_group_data),
std::move(isolate_data), &isolate_flags,
error.error(), isolate_maker);
if (error) {
FML_LOG(ERROR) << "CreateRootIsolate failed: " << error.str();
}
if (vm_isolate == nullptr) {
return {};
}
std::shared_ptr<DartIsolate>* root_isolate_data =
static_cast<std::shared_ptr<DartIsolate>*>(Dart_IsolateData(vm_isolate));
(*root_isolate_data)
->SetPlatformConfiguration(std::move(platform_configuration));
return (*root_isolate_data)->GetWeakIsolatePtr();
}
DartIsolate::DartIsolate(const Settings& settings,
bool is_root_isolate,
const UIDartState::Context& context)
: UIDartState(settings.task_observer_add,
settings.task_observer_remove,
settings.log_tag,
settings.unhandled_exception_callback,
settings.log_message_callback,
DartVMRef::GetIsolateNameServer(),
is_root_isolate,
settings.enable_skparagraph,
context),
may_insecurely_connect_to_all_domains_(
settings.may_insecurely_connect_to_all_domains),
domain_network_policy_(settings.domain_network_policy) {
phase_ = Phase::Uninitialized;
}
DartIsolate::~DartIsolate() {
if (IsRootIsolate() && GetMessageHandlingTaskRunner()) {
FML_DCHECK(GetMessageHandlingTaskRunner()->RunsTasksOnCurrentThread());
}
}
DartIsolate::Phase DartIsolate::GetPhase() const {
return phase_;
}
std::string DartIsolate::GetServiceId() {
const char* service_id_buf = Dart_IsolateServiceId(isolate());
std::string service_id(service_id_buf);
free(const_cast<char*>(service_id_buf));
return service_id;
}
bool DartIsolate::Initialize(Dart_Isolate dart_isolate) {
TRACE_EVENT0("flutter", "DartIsolate::Initialize");
if (phase_ != Phase::Uninitialized) {
return false;
}
FML_DCHECK(dart_isolate != nullptr);
FML_DCHECK(dart_isolate == Dart_CurrentIsolate());
// After this point, isolate scopes can be safely used.
SetIsolate(dart_isolate);
// For the root isolate set the "AppStartUp" as soon as the root isolate
// has been initialized. This is to ensure that all the timeline events
// that have the set user-tag will be listed user AppStartUp.
if (IsRootIsolate()) {
tonic::DartApiScope api_scope;
Dart_SetCurrentUserTag(Dart_NewUserTag("AppStartUp"));
}
SetMessageHandlingTaskRunner(GetTaskRunners().GetUITaskRunner());
if (tonic::CheckAndHandleError(
Dart_SetLibraryTagHandler(tonic::DartState::HandleLibraryTag))) {
return false;
}
if (tonic::CheckAndHandleError(
Dart_SetDeferredLoadHandler(OnDartLoadLibrary))) {
return false;
}
if (!UpdateThreadPoolNames()) {
return false;
}
phase_ = Phase::Initialized;
return true;
}
fml::RefPtr<fml::TaskRunner> DartIsolate::GetMessageHandlingTaskRunner() const {
return message_handling_task_runner_;
}
bool DartIsolate::LoadLoadingUnit(
intptr_t loading_unit_id,
std::unique_ptr<const fml::Mapping> snapshot_data,
std::unique_ptr<const fml::Mapping> snapshot_instructions) {
tonic::DartState::Scope scope(this);
fml::RefPtr<DartSnapshot> dart_snapshot =
DartSnapshot::IsolateSnapshotFromMappings(
std::move(snapshot_data), std::move(snapshot_instructions));
Dart_Handle result = Dart_DeferredLoadComplete(
loading_unit_id, dart_snapshot->GetDataMapping(),
dart_snapshot->GetInstructionsMapping());
if (tonic::CheckAndHandleError(result)) {
LoadLoadingUnitError(loading_unit_id, Dart_GetError(result),
/*transient*/ true);
return false;
}
loading_unit_snapshots_.insert(dart_snapshot);
return true;
}
void DartIsolate::LoadLoadingUnitError(intptr_t loading_unit_id,
const std::string& error_message,
bool transient) {
tonic::DartState::Scope scope(this);
Dart_Handle result = Dart_DeferredLoadCompleteError(
loading_unit_id, error_message.c_str(), transient);
tonic::CheckAndHandleError(result);
}
void DartIsolate::SetMessageHandlingTaskRunner(
const fml::RefPtr<fml::TaskRunner>& runner) {
if (!IsRootIsolate() || !runner) {
return;
}
message_handling_task_runner_ = runner;
message_handler().Initialize([runner](std::function<void()> task) {
#ifdef OS_FUCHSIA
runner->PostTask([task = std::move(task)]() {
TRACE_EVENT0("flutter", "DartIsolate::HandleMessage");
task();
});
#else
auto task_queues = fml::MessageLoopTaskQueues::GetInstance();
task_queues->RegisterTask(
runner->GetTaskQueueId(),
[task = std::move(task)]() {
TRACE_EVENT0("flutter", "DartIsolate::HandleMessage");
task();
},
fml::TimePoint::Now(), fml::TaskSourceGrade::kDartMicroTasks);
#endif
});
}
// Updating thread names here does not change the underlying OS thread names.
// Instead, this is just additional metadata for the Observatory to show the
// thread name of the isolate.
bool DartIsolate::UpdateThreadPoolNames() const {
// TODO(chinmaygarde): This implementation does not account for multiple
// shells sharing the same (or subset of) threads.
const auto& task_runners = GetTaskRunners();
if (auto task_runner = task_runners.GetRasterTaskRunner()) {
task_runner->PostTask(
[label = task_runners.GetLabel() + std::string{".raster"}]() {
Dart_SetThreadName(label.c_str());
});
}
if (auto task_runner = task_runners.GetUITaskRunner()) {
task_runner->PostTask(
[label = task_runners.GetLabel() + std::string{".ui"}]() {
Dart_SetThreadName(label.c_str());
});
}
if (auto task_runner = task_runners.GetIOTaskRunner()) {
task_runner->PostTask(
[label = task_runners.GetLabel() + std::string{".io"}]() {
Dart_SetThreadName(label.c_str());
});
}
if (auto task_runner = task_runners.GetPlatformTaskRunner()) {
task_runner->PostTask(
[label = task_runners.GetLabel() + std::string{".platform"}]() {
Dart_SetThreadName(label.c_str());
});
}
return true;
}
bool DartIsolate::LoadLibraries() {
TRACE_EVENT0("flutter", "DartIsolate::LoadLibraries");
if (phase_ != Phase::Initialized) {
return false;
}
tonic::DartState::Scope scope(this);
DartIO::InitForIsolate(may_insecurely_connect_to_all_domains_,
domain_network_policy_);
DartUI::InitForIsolate(GetIsolateGroupData().GetSettings());
const bool is_service_isolate = Dart_IsServiceIsolate(isolate());
DartRuntimeHooks::Install(IsRootIsolate() && !is_service_isolate,
GetAdvisoryScriptURI());
if (!is_service_isolate) {
class_library().add_provider(
"ui", std::make_unique<tonic::DartClassProvider>(this, "dart:ui"));
}
phase_ = Phase::LibrariesSetup;
return true;
}
bool DartIsolate::PrepareForRunningFromPrecompiledCode() {
TRACE_EVENT0("flutter", "DartIsolate::PrepareForRunningFromPrecompiledCode");
if (phase_ != Phase::LibrariesSetup) {
return false;
}
tonic::DartState::Scope scope(this);
if (Dart_IsNull(Dart_RootLibrary())) {
return false;
}
if (!MarkIsolateRunnable()) {
return false;
}
if (GetIsolateGroupData().GetChildIsolatePreparer() == nullptr) {
GetIsolateGroupData().SetChildIsolatePreparer([](DartIsolate* isolate) {
return isolate->PrepareForRunningFromPrecompiledCode();
});
}
const fml::closure& isolate_create_callback =
GetIsolateGroupData().GetIsolateCreateCallback();
if (isolate_create_callback) {
isolate_create_callback();
}
phase_ = Phase::Ready;
return true;
}
bool DartIsolate::LoadKernel(const std::shared_ptr<const fml::Mapping>& mapping,
bool last_piece) {
if (!Dart_IsKernel(mapping->GetMapping(), mapping->GetSize())) {
return false;
}
// Mapping must be retained until isolate shutdown.
kernel_buffers_.push_back(mapping);
Dart_Handle library =
Dart_LoadLibraryFromKernel(mapping->GetMapping(), mapping->GetSize());
if (tonic::CheckAndHandleError(library)) {
return false;
}
if (!last_piece) {
// More to come.
return true;
}
Dart_SetRootLibrary(library);
if (tonic::CheckAndHandleError(Dart_FinalizeLoading(false))) {
return false;
}
return true;
}
[[nodiscard]] bool DartIsolate::PrepareForRunningFromKernel(
const std::shared_ptr<const fml::Mapping>& mapping,
bool child_isolate,
bool last_piece) {
TRACE_EVENT0("flutter", "DartIsolate::PrepareForRunningFromKernel");
if (phase_ != Phase::LibrariesSetup) {
return false;
}
if (DartVM::IsRunningPrecompiledCode()) {
return false;
}
if (!mapping || mapping->GetSize() == 0) {
return false;
}
tonic::DartState::Scope scope(this);
if (!child_isolate) {
// Use root library provided by kernel in favor of one provided by snapshot.
Dart_SetRootLibrary(Dart_Null());
if (!LoadKernel(mapping, last_piece)) {
return false;
}
}
if (!last_piece) {
// More to come.
return true;
}
if (Dart_IsNull(Dart_RootLibrary())) {
return false;
}
if (!MarkIsolateRunnable()) {
return false;
}
// Child isolate shares root isolate embedder_isolate (lines 691 and 693
// below). Re-initializing child_isolate_preparer_ lambda while it is being
// executed leads to crashes.
if (GetIsolateGroupData().GetChildIsolatePreparer() == nullptr) {
GetIsolateGroupData().SetChildIsolatePreparer(
[buffers = kernel_buffers_](DartIsolate* isolate) {
for (uint64_t i = 0; i < buffers.size(); i++) {
bool last_piece = i + 1 == buffers.size();
const std::shared_ptr<const fml::Mapping>& buffer = buffers.at(i);
if (!isolate->PrepareForRunningFromKernel(buffer,
/*child_isolate=*/true,
last_piece)) {
return false;
}
}
return true;
});
}
const fml::closure& isolate_create_callback =
GetIsolateGroupData().GetIsolateCreateCallback();
if (isolate_create_callback) {
isolate_create_callback();
}
phase_ = Phase::Ready;
return true;
}
[[nodiscard]] bool DartIsolate::PrepareForRunningFromKernels(
std::vector<std::shared_ptr<const fml::Mapping>> kernels) {
const auto count = kernels.size();
if (count == 0) {
return false;
}
for (size_t i = 0; i < count; ++i) {
bool last = (i == (count - 1));
if (!PrepareForRunningFromKernel(kernels[i], /*child_isolate=*/false,
last)) {
return false;
}
}
return true;
}
[[nodiscard]] bool DartIsolate::PrepareForRunningFromKernels(
std::vector<std::unique_ptr<const fml::Mapping>> kernels) {
std::vector<std::shared_ptr<const fml::Mapping>> shared_kernels;
for (auto& kernel : kernels) {
shared_kernels.emplace_back(std::move(kernel));
}
return PrepareForRunningFromKernels(shared_kernels);
}
bool DartIsolate::MarkIsolateRunnable() {
TRACE_EVENT0("flutter", "DartIsolate::MarkIsolateRunnable");
if (phase_ != Phase::LibrariesSetup) {
return false;
}
// This function may only be called from an active isolate scope.
if (Dart_CurrentIsolate() != isolate()) {
return false;
}
// There must be no current isolate to mark an isolate as being runnable.
Dart_ExitIsolate();
char* error = Dart_IsolateMakeRunnable(isolate());
if (error) {
FML_DLOG(ERROR) << error;
::free(error);
// Failed. Restore the isolate.
Dart_EnterIsolate(isolate());
return false;
}
// Success. Restore the isolate.
Dart_EnterIsolate(isolate());
return true;
}
[[nodiscard]] static bool InvokeMainEntrypoint(
Dart_Handle user_entrypoint_function,
Dart_Handle args) {
if (tonic::CheckAndHandleError(user_entrypoint_function)) {
FML_LOG(ERROR) << "Could not resolve main entrypoint function.";
return false;
}
Dart_Handle start_main_isolate_function =
tonic::DartInvokeField(Dart_LookupLibrary(tonic::ToDart("dart:isolate")),
"_getStartMainIsolateFunction", {});
if (tonic::CheckAndHandleError(start_main_isolate_function)) {
FML_LOG(ERROR) << "Could not resolve main entrypoint trampoline.";
return false;
}
if (tonic::CheckAndHandleError(tonic::DartInvokeField(
Dart_LookupLibrary(tonic::ToDart("dart:ui")), "_runMain",
{start_main_isolate_function, user_entrypoint_function, args}))) {
FML_LOG(ERROR) << "Could not invoke the main entrypoint.";
return false;
}
return true;
}
bool DartIsolate::RunFromLibrary(std::optional<std::string> library_name,
std::optional<std::string> entrypoint,
const std::vector<std::string>& args) {
TRACE_EVENT0("flutter", "DartIsolate::RunFromLibrary");
if (phase_ != Phase::Ready) {
return false;
}
tonic::DartState::Scope scope(this);
auto library_handle =
library_name.has_value() && !library_name.value().empty()
? ::Dart_LookupLibrary(tonic::ToDart(library_name.value().c_str()))
: ::Dart_RootLibrary();
auto entrypoint_handle = entrypoint.has_value() && !entrypoint.value().empty()
? tonic::ToDart(entrypoint.value().c_str())
: tonic::ToDart("main");
if (!FindAndInvokeDartPluginRegistrant()) {
// TODO(gaaclarke): Remove once the framework PR lands that uses `--source`
// to compile the Dart Plugin Registrant
// (https://github.com/flutter/flutter/pull/100572).
InvokeDartPluginRegistrantIfAvailable(library_handle);
}
auto user_entrypoint_function =
::Dart_GetField(library_handle, entrypoint_handle);
auto entrypoint_args = tonic::ToDart(args);
if (!InvokeMainEntrypoint(user_entrypoint_function, entrypoint_args)) {
return false;
}
phase_ = Phase::Running;
return true;
}
bool DartIsolate::Shutdown() {
TRACE_EVENT0("flutter", "DartIsolate::Shutdown");
// This call may be re-entrant since Dart_ShutdownIsolate can invoke the
// cleanup callback which deletes the embedder side object of the dart isolate
// (a.k.a. this).
if (phase_ == Phase::Shutdown) {
return false;
}
phase_ = Phase::Shutdown;
Dart_Isolate vm_isolate = isolate();
// The isolate can be nullptr if this instance is the stub isolate data used
// during root isolate creation.
if (vm_isolate != nullptr) {
// We need to enter the isolate because Dart_ShutdownIsolate does not take
// the isolate to shutdown as a parameter.
FML_DCHECK(Dart_CurrentIsolate() == nullptr);
Dart_EnterIsolate(vm_isolate);
Dart_ShutdownIsolate();
FML_DCHECK(Dart_CurrentIsolate() == nullptr);
}
return true;
}
Dart_Isolate DartIsolate::DartCreateAndStartServiceIsolate(
const char* package_root,
const char* package_config,
Dart_IsolateFlags* flags,
char** error) {
auto vm_data = DartVMRef::GetVMData();
if (!vm_data) {
*error = fml::strdup(
"Could not access VM data to initialize isolates. This may be because "
"the VM has initialized shutdown on another thread already.");
return nullptr;
}
const auto& settings = vm_data->GetSettings();
if (!settings.enable_observatory) {
return nullptr;
}
flags->load_vmservice_library = true;
#if (FLUTTER_RUNTIME_MODE != FLUTTER_RUNTIME_MODE_DEBUG)
// TODO(68663): The service isolate in debug mode is always launched without
// sound null safety. Fix after the isolate snapshot data is created with the
// right flags.
flags->null_safety = vm_data->GetServiceIsolateSnapshotNullSafety();
#endif
UIDartState::Context context(
TaskRunners("io.flutter." DART_VM_SERVICE_ISOLATE_NAME, nullptr, nullptr,
nullptr, nullptr));
context.advisory_script_uri = DART_VM_SERVICE_ISOLATE_NAME;
context.advisory_script_entrypoint = DART_VM_SERVICE_ISOLATE_NAME;
std::weak_ptr<DartIsolate> weak_service_isolate =
DartIsolate::CreateRootIsolate(vm_data->GetSettings(), //
vm_data->GetServiceIsolateSnapshot(), //
nullptr, //
DartIsolate::Flags{flags}, //
nullptr, //
nullptr, //
context); //
std::shared_ptr<DartIsolate> service_isolate = weak_service_isolate.lock();
if (!service_isolate) {
*error = fml::strdup("Could not create the service isolate.");
FML_DLOG(ERROR) << *error;
return nullptr;
}
tonic::DartState::Scope scope(service_isolate);
if (!DartServiceIsolate::Startup(
settings.observatory_host, // server IP address
settings.observatory_port, // server observatory port
tonic::DartState::HandleLibraryTag, // embedder library tag handler
false, // disable websocket origin check
settings.disable_service_auth_codes, // disable VM service auth codes
settings.enable_service_port_fallback, // enable fallback to port 0
// when bind fails.
error // error (out)
)) {
// Error is populated by call to startup.
FML_DLOG(ERROR) << *error;
return nullptr;
}
if (auto callback = vm_data->GetSettings().service_isolate_create_callback) {
callback();
}
if (auto service_protocol = DartVMRef::GetServiceProtocol()) {
service_protocol->ToggleHooks(true);
} else {
FML_DLOG(ERROR)
<< "Could not acquire the service protocol handlers. This might be "
"because the VM has already begun teardown on another thread.";
}
return service_isolate->isolate();
}
DartIsolateGroupData& DartIsolate::GetIsolateGroupData() {
std::shared_ptr<DartIsolateGroupData>* isolate_group_data =
static_cast<std::shared_ptr<DartIsolateGroupData>*>(
Dart_IsolateGroupData(isolate()));
return **isolate_group_data;
}
const DartIsolateGroupData& DartIsolate::GetIsolateGroupData() const {
DartIsolate* non_const_this = const_cast<DartIsolate*>(this);
return non_const_this->GetIsolateGroupData();
}
// |Dart_IsolateGroupCreateCallback|
Dart_Isolate DartIsolate::DartIsolateGroupCreateCallback(
const char* advisory_script_uri,
const char* advisory_script_entrypoint,
const char* package_root,
const char* package_config,
Dart_IsolateFlags* flags,
std::shared_ptr<DartIsolate>* parent_isolate_data,
char** error) {
TRACE_EVENT0("flutter", "DartIsolate::DartIsolateGroupCreateCallback");
if (parent_isolate_data == nullptr &&
strcmp(advisory_script_uri, DART_VM_SERVICE_ISOLATE_NAME) == 0) {
// The VM attempts to start the VM service for us on |Dart_Initialize|. In
// such a case, the callback data will be null and the script URI will be
// DART_VM_SERVICE_ISOLATE_NAME. In such cases, we just create the service
// isolate like normal but dont hold a reference to it at all. We also start
// this isolate since we will never again reference it from the engine.
return DartCreateAndStartServiceIsolate(package_root, //
package_config, //
flags, //
error //
);
}
if (!parent_isolate_data) {
return nullptr;
}
DartIsolateGroupData& parent_group_data =
(*parent_isolate_data)->GetIsolateGroupData();
if (strncmp(advisory_script_uri, kFileUriPrefix.data(),
kFileUriPrefix.size())) {
std::string error_msg =
std::string("Unsupported isolate URI: ") + advisory_script_uri;
*error = fml::strdup(error_msg.c_str());
return nullptr;
}
auto isolate_group_data =
std::make_unique<std::shared_ptr<DartIsolateGroupData>>(
std::shared_ptr<DartIsolateGroupData>(new DartIsolateGroupData(
parent_group_data.GetSettings(),
parent_group_data.GetIsolateSnapshot(), advisory_script_uri,
advisory_script_entrypoint,
parent_group_data.GetChildIsolatePreparer(),
parent_group_data.GetIsolateCreateCallback(),
parent_group_data.GetIsolateShutdownCallback())));
TaskRunners null_task_runners(advisory_script_uri,
/* platform= */ nullptr,
/* raster= */ nullptr,
/* ui= */ nullptr,
/* io= */ nullptr);
UIDartState::Context context(null_task_runners);
context.advisory_script_uri = advisory_script_uri;
context.advisory_script_entrypoint = advisory_script_entrypoint;
auto isolate_data = std::make_unique<std::shared_ptr<DartIsolate>>(
std::shared_ptr<DartIsolate>(
new DartIsolate((*isolate_group_data)->GetSettings(), // settings
false, // is_root_isolate
context))); // context
Dart_Isolate vm_isolate = CreateDartIsolateGroup(
std::move(isolate_group_data), std::move(isolate_data), flags, error,
[](std::shared_ptr<DartIsolateGroupData>* isolate_group_data,
std::shared_ptr<DartIsolate>* isolate_data, Dart_IsolateFlags* flags,
char** error) {
return Dart_CreateIsolateGroup(
(*isolate_group_data)->GetAdvisoryScriptURI().c_str(),
(*isolate_group_data)->GetAdvisoryScriptEntrypoint().c_str(),
(*isolate_group_data)->GetIsolateSnapshot()->GetDataMapping(),
(*isolate_group_data)
->GetIsolateSnapshot()
->GetInstructionsMapping(),
flags, isolate_group_data, isolate_data, error);
});
if (*error) {
FML_LOG(ERROR) << "CreateDartIsolateGroup failed: " << error;
}
return vm_isolate;
}
// |Dart_IsolateInitializeCallback|
bool DartIsolate::DartIsolateInitializeCallback(void** child_callback_data,
char** error) {
TRACE_EVENT0("flutter", "DartIsolate::DartIsolateInitializeCallback");
Dart_Isolate isolate = Dart_CurrentIsolate();
if (isolate == nullptr) {
*error = fml::strdup("Isolate should be available in initialize callback.");
FML_DLOG(ERROR) << *error;
return false;
}
auto* isolate_group_data =
static_cast<std::shared_ptr<DartIsolateGroupData>*>(
Dart_CurrentIsolateGroupData());
TaskRunners null_task_runners((*isolate_group_data)->GetAdvisoryScriptURI(),
/* platform= */ nullptr,
/* raster= */ nullptr,
/* ui= */ nullptr,
/* io= */ nullptr);
UIDartState::Context context(null_task_runners);
context.advisory_script_uri = (*isolate_group_data)->GetAdvisoryScriptURI();
context.advisory_script_entrypoint =
(*isolate_group_data)->GetAdvisoryScriptEntrypoint();
auto embedder_isolate = std::make_unique<std::shared_ptr<DartIsolate>>(
std::shared_ptr<DartIsolate>(
new DartIsolate((*isolate_group_data)->GetSettings(), // settings
false, // is_root_isolate
context))); // context
// root isolate should have been created via CreateRootIsolate
if (!InitializeIsolate(*embedder_isolate, isolate, error)) {
return false;
}
// The ownership of the embedder object is controlled by the Dart VM. So the
// only reference returned to the caller is weak.
*child_callback_data = embedder_isolate.release();
return true;
}
Dart_Isolate DartIsolate::CreateDartIsolateGroup(
std::unique_ptr<std::shared_ptr<DartIsolateGroupData>> isolate_group_data,
std::unique_ptr<std::shared_ptr<DartIsolate>> isolate_data,
Dart_IsolateFlags* flags,
char** error,
const DartIsolate::IsolateMaker& make_isolate) {
TRACE_EVENT0("flutter", "DartIsolate::CreateDartIsolateGroup");
// Create the Dart VM isolate and give it the embedder object as the baton.
Dart_Isolate isolate =
make_isolate(isolate_group_data.get(), isolate_data.get(), flags, error);
if (isolate == nullptr) {
return nullptr;
}
bool success = false;
{
// Ownership of the isolate data objects has been transferred to the Dart
// VM.
// NOLINTBEGIN(clang-analyzer-cplusplus.NewDeleteLeaks)
std::shared_ptr<DartIsolate> embedder_isolate(*isolate_data);
isolate_group_data.release();
isolate_data.release();
// NOLINTEND(clang-analyzer-cplusplus.NewDeleteLeaks)
success = InitializeIsolate(embedder_isolate, isolate, error);
}
if (!success) {
Dart_ShutdownIsolate();
return nullptr;
}
// Balances the implicit [Dart_EnterIsolate] by [make_isolate] above.
Dart_ExitIsolate();
return isolate;
}
bool DartIsolate::InitializeIsolate(
const std::shared_ptr<DartIsolate>& embedder_isolate,
Dart_Isolate isolate,
char** error) {
TRACE_EVENT0("flutter", "DartIsolate::InitializeIsolate");
if (!embedder_isolate->Initialize(isolate)) {
*error = fml::strdup("Embedder could not initialize the Dart isolate.");
FML_DLOG(ERROR) << *error;
return false;
}
if (!embedder_isolate->LoadLibraries()) {
*error = fml::strdup(
"Embedder could not load libraries in the new Dart isolate.");
FML_DLOG(ERROR) << *error;
return false;
}
// Root isolates will be set up by the engine and the service isolate
// (which is also a root isolate) by the utility routines in the VM.
// However, secondary isolates will be run by the VM if they are
// marked as runnable.
if (!embedder_isolate->IsRootIsolate()) {
auto child_isolate_preparer =
embedder_isolate->GetIsolateGroupData().GetChildIsolatePreparer();
FML_DCHECK(child_isolate_preparer);
if (!child_isolate_preparer(embedder_isolate.get())) {
*error = fml::strdup("Could not prepare the child isolate to run.");
FML_DLOG(ERROR) << *error;
return false;
}
}
return true;
}
// |Dart_IsolateShutdownCallback|
void DartIsolate::DartIsolateShutdownCallback(
std::shared_ptr<DartIsolateGroupData>* isolate_group_data,
std::shared_ptr<DartIsolate>* isolate_data) {
TRACE_EVENT0("flutter", "DartIsolate::DartIsolateShutdownCallback");
// If the isolate initialization failed there will be nothing to do.
// This can happen e.g. during a [DartIsolateInitializeCallback] invocation
// that fails to initialize the VM-created isolate.
if (isolate_data == nullptr) {
return;
}
isolate_data->get()->OnShutdownCallback();
}
// |Dart_IsolateGroupCleanupCallback|
void DartIsolate::DartIsolateGroupCleanupCallback(
std::shared_ptr<DartIsolateGroupData>* isolate_data) {
TRACE_EVENT0("flutter", "DartIsolate::DartIsolateGroupCleanupCallback");
delete isolate_data;
}
// |Dart_IsolateCleanupCallback|
void DartIsolate::DartIsolateCleanupCallback(
std::shared_ptr<DartIsolateGroupData>* isolate_group_data,
std::shared_ptr<DartIsolate>* isolate_data) {
TRACE_EVENT0("flutter", "DartIsolate::DartIsolateCleanupCallback");
delete isolate_data;
}
std::weak_ptr<DartIsolate> DartIsolate::GetWeakIsolatePtr() {
return std::static_pointer_cast<DartIsolate>(shared_from_this());
}
void DartIsolate::AddIsolateShutdownCallback(const fml::closure& closure) {
shutdown_callbacks_.emplace_back(std::make_unique<AutoFireClosure>(closure));
}
void DartIsolate::OnShutdownCallback() {
tonic::DartState* state = tonic::DartState::Current();
if (state != nullptr) {
state->SetIsShuttingDown();
}
{
tonic::DartApiScope api_scope;
Dart_Handle sticky_error = Dart_GetStickyError();
if (!Dart_IsNull(sticky_error) && !Dart_IsFatalError(sticky_error)) {
FML_LOG(ERROR) << Dart_GetError(sticky_error);
}
}
shutdown_callbacks_.clear();
const fml::closure& isolate_shutdown_callback =
GetIsolateGroupData().GetIsolateShutdownCallback();
if (isolate_shutdown_callback) {
isolate_shutdown_callback();
}
}
Dart_Handle DartIsolate::OnDartLoadLibrary(intptr_t loading_unit_id) {
if (Current()->platform_configuration()) {
Current()->platform_configuration()->client()->RequestDartDeferredLibrary(
loading_unit_id);
return Dart_Null();
}
const std::string error_message =
"Platform Configuration was null. Deferred library load request"
"for loading unit id " +
std::to_string(loading_unit_id) + " was not sent.";
FML_LOG(ERROR) << error_message;
return Dart_NewApiError(error_message.c_str());
}
DartIsolate::AutoFireClosure::AutoFireClosure(const fml::closure& closure)
: closure_(closure) {}
DartIsolate::AutoFireClosure::~AutoFireClosure() {
if (closure_) {
closure_();
}
}
} // namespace flutter