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#include "debug_utils-inl.h"
#include "env-inl.h"
#include "node.h"
#include "node_snapshot_builder.h"
using v8::Context;
using v8::Function;
using v8::Global;
using v8::HandleScope;
using v8::Isolate;
using v8::Just;
using v8::Local;
using v8::Locker;
using v8::Maybe;
using v8::Nothing;
using v8::SealHandleScope;
using v8::SnapshotCreator;
using v8::TryCatch;
namespace node {
Maybe<ExitCode> SpinEventLoopInternal(Environment* env) {
CHECK_NOT_NULL(env);
MultiIsolatePlatform* platform = GetMultiIsolatePlatform(env);
CHECK_NOT_NULL(platform);
Isolate* isolate = env->isolate();
HandleScope handle_scope(isolate);
Context::Scope context_scope(env->context());
SealHandleScope seal(isolate);
if (env->is_stopping()) return Nothing<ExitCode>();
env->set_trace_sync_io(env->options()->trace_sync_io);
{
bool more;
env->performance_state()->Mark(
node::performance::NODE_PERFORMANCE_MILESTONE_LOOP_START);
do {
if (env->is_stopping()) break;
uv_run(env->event_loop(), UV_RUN_DEFAULT);
if (env->is_stopping()) break;
platform->DrainTasks(isolate);
more = uv_loop_alive(env->event_loop());
if (more && !env->is_stopping()) continue;
if (EmitProcessBeforeExit(env).IsNothing())
break;
{
HandleScope handle_scope(isolate);
if (env->RunSnapshotSerializeCallback().IsEmpty()) {
break;
}
}
// Emit `beforeExit` if the loop became alive either after emitting
// event, or after running some callbacks.
more = uv_loop_alive(env->event_loop());
} while (more == true && !env->is_stopping());
env->performance_state()->Mark(
node::performance::NODE_PERFORMANCE_MILESTONE_LOOP_EXIT);
}
if (env->is_stopping()) return Nothing<ExitCode>();
env->set_trace_sync_io(false);
// Clear the serialize callback even though the JS-land queue should
// be empty this point so that the deserialized instance won't
// attempt to call into JS again.
env->set_snapshot_serialize_callback(Local<Function>());
env->PrintInfoForSnapshotIfDebug();
env->ForEachRealm([](Realm* realm) { realm->VerifyNoStrongBaseObjects(); });
Maybe<ExitCode> exit_code = EmitProcessExitInternal(env);
if (exit_code.FromMaybe(ExitCode::kGenericUserError) !=
ExitCode::kNoFailure) {
return exit_code;
}
auto unsettled_tla = env->CheckUnsettledTopLevelAwait();
if (unsettled_tla.IsNothing()) {
return Nothing<ExitCode>();
}
if (!unsettled_tla.FromJust()) {
return Just(ExitCode::kUnsettledTopLevelAwait);
}
return Just(ExitCode::kNoFailure);
}
struct CommonEnvironmentSetup::Impl {
MultiIsolatePlatform* platform = nullptr;
uv_loop_t loop;
std::shared_ptr<ArrayBufferAllocator> allocator;
std::optional<SnapshotCreator> snapshot_creator;
Isolate* isolate = nullptr;
DeleteFnPtr<IsolateData, FreeIsolateData> isolate_data;
DeleteFnPtr<Environment, FreeEnvironment> env;
Global<Context> main_context;
};
CommonEnvironmentSetup::CommonEnvironmentSetup(
MultiIsolatePlatform* platform,
std::vector<std::string>* errors,
const EmbedderSnapshotData* snapshot_data,
uint32_t flags,
std::function<Environment*(const CommonEnvironmentSetup*)> make_env,
const SnapshotConfig* snapshot_config)
: impl_(new Impl()) {
CHECK_NOT_NULL(platform);
CHECK_NOT_NULL(errors);
impl_->platform = platform;
uv_loop_t* loop = &impl_->loop;
// Use `data` to tell the destructor whether the loop was initialized or not.
loop->data = nullptr;
int ret = uv_loop_init(loop);
if (ret != 0) {
errors->push_back(
SPrintF("Failed to initialize loop: %s", uv_err_name(ret)));
return;
}
loop->data = this;
Isolate* isolate;
if (flags & Flags::kIsForSnapshotting) {
const std::vector<intptr_t>& external_references =
SnapshotBuilder::CollectExternalReferences();
isolate = impl_->isolate = Isolate::Allocate();
// Must be done before the SnapshotCreator creation so that the
// memory reducer can be initialized.
platform->RegisterIsolate(isolate, loop);
impl_->snapshot_creator.emplace(isolate, external_references.data());
isolate->SetCaptureStackTraceForUncaughtExceptions(
true, 10, v8::StackTrace::StackTraceOptions::kDetailed);
SetIsolateMiscHandlers(isolate, {});
} else {
impl_->allocator = ArrayBufferAllocator::Create();
isolate = impl_->isolate =
NewIsolate(impl_->allocator, &impl_->loop, platform, snapshot_data);
}
{
Locker locker(isolate);
Isolate::Scope isolate_scope(isolate);
HandleScope handle_scope(isolate);
TryCatch bootstrapCatch(isolate);
auto print_Exception = OnScopeLeave([&]() {
if (bootstrapCatch.HasCaught()) {
errors->push_back(FormatCaughtException(
isolate, isolate->GetCurrentContext(), bootstrapCatch));
}
});
impl_->isolate_data.reset(CreateIsolateData(
isolate, loop, platform, impl_->allocator.get(), snapshot_data));
impl_->isolate_data->set_snapshot_config(snapshot_config);
if (snapshot_data) {
impl_->env.reset(make_env(this));
if (impl_->env) {
impl_->main_context.Reset(isolate, impl_->env->context());
}
return;
}
Local<Context> context = NewContext(isolate);
impl_->main_context.Reset(isolate, context);
if (context.IsEmpty()) {
errors->push_back("Failed to initialize V8 Context");
return;
}
Context::Scope context_scope(context);
impl_->env.reset(make_env(this));
}
}
CommonEnvironmentSetup::CommonEnvironmentSetup(
MultiIsolatePlatform* platform,
std::vector<std::string>* errors,
std::function<Environment*(const CommonEnvironmentSetup*)> make_env)
: CommonEnvironmentSetup(platform, errors, nullptr, false, make_env) {}
std::unique_ptr<CommonEnvironmentSetup>
CommonEnvironmentSetup::CreateForSnapshotting(
MultiIsolatePlatform* platform,
std::vector<std::string>* errors,
const std::vector<std::string>& args,
const std::vector<std::string>& exec_args,
const SnapshotConfig& snapshot_config) {
// It's not guaranteed that a context that goes through
// v8_inspector::V8Inspector::contextCreated() is runtime-independent,
// so do not start the inspector on the main context when building
// the default snapshot.
uint64_t env_flags =
EnvironmentFlags::kDefaultFlags | EnvironmentFlags::kNoCreateInspector;
auto ret = std::unique_ptr<CommonEnvironmentSetup>(new CommonEnvironmentSetup(
platform,
errors,
nullptr,
true,
[&](const CommonEnvironmentSetup* setup) -> Environment* {
return CreateEnvironment(
setup->isolate_data(),
setup->context(),
args,
exec_args,
static_cast<EnvironmentFlags::Flags>(env_flags));
},
&snapshot_config));
if (!errors->empty()) ret.reset();
return ret;
}
CommonEnvironmentSetup::~CommonEnvironmentSetup() {
if (impl_->isolate != nullptr) {
Isolate* isolate = impl_->isolate;
{
Locker locker(isolate);
Isolate::Scope isolate_scope(isolate);
impl_->main_context.Reset();
impl_->env.reset();
impl_->isolate_data.reset();
}
bool platform_finished = false;
impl_->platform->AddIsolateFinishedCallback(isolate, [](void* data) {
*static_cast<bool*>(data) = true;
}, &platform_finished);
impl_->platform->UnregisterIsolate(isolate);
if (impl_->snapshot_creator.has_value())
impl_->snapshot_creator.reset();
else
isolate->Dispose();
// Wait until the platform has cleaned up all relevant resources.
while (!platform_finished)
uv_run(&impl_->loop, UV_RUN_ONCE);
}
if (impl_->isolate || impl_->loop.data != nullptr)
CheckedUvLoopClose(&impl_->loop);
delete impl_;
}
EmbedderSnapshotData::Pointer CommonEnvironmentSetup::CreateSnapshot() {
CHECK_NOT_NULL(snapshot_creator());
SnapshotData* snapshot_data = new SnapshotData();
EmbedderSnapshotData::Pointer result{
new EmbedderSnapshotData(snapshot_data, true)};
auto exit_code = SnapshotBuilder::CreateSnapshot(snapshot_data, this);
if (exit_code != ExitCode::kNoFailure) return {};
return result;
}
Maybe<int> SpinEventLoop(Environment* env) {
Maybe<ExitCode> result = SpinEventLoopInternal(env);
if (result.IsNothing()) {
return Nothing<int>();
}
return Just(static_cast<int>(result.FromJust()));
}
uv_loop_t* CommonEnvironmentSetup::event_loop() const {
return &impl_->loop;
}
std::shared_ptr<ArrayBufferAllocator>
CommonEnvironmentSetup::array_buffer_allocator() const {
return impl_->allocator;
}
Isolate* CommonEnvironmentSetup::isolate() const {
return impl_->isolate;
}
IsolateData* CommonEnvironmentSetup::isolate_data() const {
return impl_->isolate_data.get();
}
Environment* CommonEnvironmentSetup::env() const {
return impl_->env.get();
}
v8::Local<v8::Context> CommonEnvironmentSetup::context() const {
return impl_->main_context.Get(impl_->isolate);
}
v8::SnapshotCreator* CommonEnvironmentSetup::snapshot_creator() {
return impl_->snapshot_creator ? &impl_->snapshot_creator.value() : nullptr;
}
void EmbedderSnapshotData::DeleteSnapshotData::operator()(
const EmbedderSnapshotData* data) const {
CHECK_IMPLIES(data->owns_impl_, data->impl_);
if (data->owns_impl_ &&
data->impl_->data_ownership == SnapshotData::DataOwnership::kOwned) {
delete data->impl_;
}
delete data;
}
EmbedderSnapshotData::Pointer EmbedderSnapshotData::BuiltinSnapshotData() {
return EmbedderSnapshotData::Pointer{new EmbedderSnapshotData(
SnapshotBuilder::GetEmbeddedSnapshotData(), false)};
}
EmbedderSnapshotData::Pointer EmbedderSnapshotData::FromBlob(
const std::vector<char>& in) {
return FromBlob(std::string_view(in.data(), in.size()));
}
EmbedderSnapshotData::Pointer EmbedderSnapshotData::FromBlob(
std::string_view in) {
SnapshotData* snapshot_data = new SnapshotData();
CHECK_EQ(snapshot_data->data_ownership, SnapshotData::DataOwnership::kOwned);
EmbedderSnapshotData::Pointer result{
new EmbedderSnapshotData(snapshot_data, true)};
if (!SnapshotData::FromBlob(snapshot_data, in)) {
return {};
}
return result;
}
EmbedderSnapshotData::Pointer EmbedderSnapshotData::FromFile(FILE* in) {
return FromBlob(ReadFileSync(in));
}
std::vector<char> EmbedderSnapshotData::ToBlob() const {
return impl_->ToBlob();
}
void EmbedderSnapshotData::ToFile(FILE* out) const {
impl_->ToFile(out);
}
EmbedderSnapshotData::EmbedderSnapshotData(const SnapshotData* impl,
bool owns_impl)
: impl_(impl), owns_impl_(owns_impl) {}
bool EmbedderSnapshotData::CanUseCustomSnapshotPerIsolate() {
#ifdef NODE_V8_SHARED_RO_HEAP
return false;
#else
return true;
#endif
}
} // namespace node