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module_wrap.cc
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#include "module_wrap.h"
#include "env.h"
#include "memory_tracker-inl.h"
#include "node_contextify.h"
#include "node_errors.h"
#include "node_external_reference.h"
#include "node_internals.h"
#include "node_process-inl.h"
#include "node_watchdog.h"
#include "util-inl.h"
#include <sys/stat.h> // S_IFDIR
#include <algorithm>
namespace node {
namespace loader {
using errors::TryCatchScope;
using node::contextify::ContextifyContext;
using v8::Array;
using v8::ArrayBufferView;
using v8::Context;
using v8::Data;
using v8::EscapableHandleScope;
using v8::Exception;
using v8::FixedArray;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::Global;
using v8::HandleScope;
using v8::Int32;
using v8::Integer;
using v8::Isolate;
using v8::Just;
using v8::JustVoid;
using v8::Local;
using v8::LocalVector;
using v8::Maybe;
using v8::MaybeLocal;
using v8::MemorySpan;
using v8::Message;
using v8::MicrotaskQueue;
using v8::Module;
using v8::ModuleImportPhase;
using v8::ModuleRequest;
using v8::Name;
using v8::Nothing;
using v8::Null;
using v8::Object;
using v8::ObjectTemplate;
using v8::PrimitiveArray;
using v8::Promise;
using v8::PromiseRejectEvent;
using v8::ScriptCompiler;
using v8::ScriptOrigin;
using v8::String;
using v8::Symbol;
using v8::UnboundModuleScript;
using v8::Undefined;
using v8::Value;
ModuleWrap::ModuleWrap(Realm* realm,
Local<Object> object,
Local<Module> module,
Local<String> url,
Local<Object> context_object,
Local<Value> synthetic_evaluation_step)
: BaseObject(realm, object),
module_(realm->isolate(), module),
module_hash_(module->GetIdentityHash()) {
realm->env()->hash_to_module_map.emplace(module_hash_, this);
object->SetInternalField(kModuleSlot, module);
object->SetInternalField(kURLSlot, url);
object->SetInternalField(kModuleSourceObjectSlot,
v8::Undefined(realm->isolate()));
object->SetInternalField(kSyntheticEvaluationStepsSlot,
synthetic_evaluation_step);
object->SetInternalField(kContextObjectSlot, context_object);
if (!synthetic_evaluation_step->IsUndefined()) {
synthetic_ = true;
}
MakeWeak();
module_.SetWeak();
}
ModuleWrap::~ModuleWrap() {
auto range = env()->hash_to_module_map.equal_range(module_hash_);
for (auto it = range.first; it != range.second; ++it) {
if (it->second == this) {
env()->hash_to_module_map.erase(it);
break;
}
}
}
Local<Context> ModuleWrap::context() const {
Local<Value> obj = object()->GetInternalField(kContextObjectSlot).As<Value>();
// If this fails, there is likely a bug e.g. ModuleWrap::context() is accessed
// before the ModuleWrap constructor completes.
CHECK(obj->IsObject());
return obj.As<Object>()->GetCreationContextChecked();
}
ModuleWrap* ModuleWrap::GetFromModule(Environment* env,
Local<Module> module) {
auto range = env->hash_to_module_map.equal_range(module->GetIdentityHash());
for (auto it = range.first; it != range.second; ++it) {
if (it->second->module_ == module) {
return it->second;
}
}
return nullptr;
}
Maybe<bool> ModuleWrap::CheckUnsettledTopLevelAwait() {
Isolate* isolate = env()->isolate();
Local<Context> context = env()->context();
// This must be invoked when the environment is shutting down, and the module
// is kept alive by the module wrap via an internal field.
CHECK(env()->exiting());
CHECK(!module_.IsEmpty());
Local<Module> module = module_.Get(isolate);
// It's a synthetic module, likely a facade wrapping CJS.
if (!module->IsSourceTextModule()) {
return Just(true);
}
if (!module->IsGraphAsync()) { // There is no TLA, no need to check.
return Just(true);
}
auto stalled_messages =
std::get<1>(module->GetStalledTopLevelAwaitMessages(isolate));
if (stalled_messages.empty()) {
return Just(true);
}
if (env()->options()->warnings) {
for (auto& message : stalled_messages) {
std::string reason = "Warning: Detected unsettled top-level await at ";
std::string info =
FormatErrorMessage(isolate, context, "", message, true);
reason += info;
FPrintF(stderr, "%s\n", reason);
}
}
return Just(false);
}
Local<PrimitiveArray> ModuleWrap::GetHostDefinedOptions(
Isolate* isolate, Local<Symbol> id_symbol) {
Local<PrimitiveArray> host_defined_options =
PrimitiveArray::New(isolate, HostDefinedOptions::kLength);
host_defined_options->Set(isolate, HostDefinedOptions::kID, id_symbol);
return host_defined_options;
}
// new ModuleWrap(url, context, source, lineOffset, columnOffset[, cachedData]);
// new ModuleWrap(url, context, source, lineOffset, columnOffset,
// idSymbol);
// new ModuleWrap(url, context, exportNames, evaluationCallback[, cjsModule])
void ModuleWrap::New(const FunctionCallbackInfo<Value>& args) {
CHECK(args.IsConstructCall());
CHECK_GE(args.Length(), 3);
Realm* realm = Realm::GetCurrent(args);
Isolate* isolate = realm->isolate();
Local<Object> that = args.This();
CHECK(args[0]->IsString());
Local<String> url = args[0].As<String>();
Local<Context> context;
ContextifyContext* contextify_context = nullptr;
if (args[1]->IsUndefined()) {
context = that->GetCreationContextChecked();
} else {
CHECK(args[1]->IsObject());
contextify_context = ContextifyContext::ContextFromContextifiedSandbox(
realm->env(), args[1].As<Object>());
CHECK_NOT_NULL(contextify_context);
context = contextify_context->context();
}
int line_offset = 0;
int column_offset = 0;
bool synthetic = args[2]->IsArray();
bool can_use_builtin_cache = false;
Local<PrimitiveArray> host_defined_options =
PrimitiveArray::New(isolate, HostDefinedOptions::kLength);
Local<Symbol> id_symbol;
if (synthetic) {
// new ModuleWrap(url, context, exportNames, evaluationCallback[,
// cjsModule])
CHECK(args[3]->IsFunction());
} else {
// new ModuleWrap(url, context, source, lineOffset, columnOffset[,
// cachedData]);
// new ModuleWrap(url, context, source, lineOffset, columnOffset,
// idSymbol);
CHECK(args[2]->IsString());
CHECK(args[3]->IsNumber());
line_offset = args[3].As<Int32>()->Value();
CHECK(args[4]->IsNumber());
column_offset = args[4].As<Int32>()->Value();
if (args[5]->IsSymbol()) {
id_symbol = args[5].As<Symbol>();
can_use_builtin_cache =
(id_symbol ==
realm->isolate_data()->source_text_module_default_hdo());
} else {
id_symbol = Symbol::New(isolate, url);
}
host_defined_options = GetHostDefinedOptions(isolate, id_symbol);
if (that->SetPrivate(context,
realm->isolate_data()->host_defined_option_symbol(),
id_symbol)
.IsNothing()) {
return;
}
}
ShouldNotAbortOnUncaughtScope no_abort_scope(realm->env());
TryCatchScope try_catch(realm->env());
Local<Module> module;
{
Context::Scope context_scope(context);
if (synthetic) {
CHECK(args[2]->IsArray());
Local<Array> export_names_arr = args[2].As<Array>();
uint32_t len = export_names_arr->Length();
LocalVector<String> export_names(realm->isolate(), len);
for (uint32_t i = 0; i < len; i++) {
Local<Value> export_name_val;
if (!export_names_arr->Get(context, i).ToLocal(&export_name_val)) {
return;
}
CHECK(export_name_val->IsString());
export_names[i] = export_name_val.As<String>();
}
const MemorySpan<const Local<String>> span(export_names.begin(),
export_names.size());
module = Module::CreateSyntheticModule(
isolate, url, span, SyntheticModuleEvaluationStepsCallback);
} else {
// When we are compiling for the default loader, this will be
// std::nullopt, and CompileSourceTextModule() should use
// on-disk cache.
std::optional<ScriptCompiler::CachedData*> user_cached_data;
if (id_symbol !=
realm->isolate_data()->source_text_module_default_hdo()) {
user_cached_data = nullptr;
}
if (args[5]->IsArrayBufferView()) {
CHECK(!can_use_builtin_cache); // We don't use this option internally.
Local<ArrayBufferView> cached_data_buf = args[5].As<ArrayBufferView>();
uint8_t* data =
static_cast<uint8_t*>(cached_data_buf->Buffer()->Data());
user_cached_data =
new ScriptCompiler::CachedData(data + cached_data_buf->ByteOffset(),
cached_data_buf->ByteLength());
}
Local<String> source_text = args[2].As<String>();
bool cache_rejected = false;
if (!CompileSourceTextModule(realm,
source_text,
url,
line_offset,
column_offset,
host_defined_options,
user_cached_data,
&cache_rejected)
.ToLocal(&module)) {
if (try_catch.HasCaught() && !try_catch.HasTerminated()) {
CHECK(!try_catch.Message().IsEmpty());
CHECK(!try_catch.Exception().IsEmpty());
AppendExceptionLine(realm->env(),
try_catch.Exception(),
try_catch.Message(),
ErrorHandlingMode::MODULE_ERROR);
try_catch.ReThrow();
}
return;
}
if (user_cached_data.has_value() && user_cached_data.value() != nullptr &&
cache_rejected) {
THROW_ERR_VM_MODULE_CACHED_DATA_REJECTED(
realm, "cachedData buffer was rejected");
try_catch.ReThrow();
return;
}
if (that->Set(context,
realm->env()->source_map_url_string(),
module->GetUnboundModuleScript()->GetSourceMappingURL())
.IsNothing()) {
return;
}
}
}
if (!that->Set(context, realm->isolate_data()->url_string(), url)
.FromMaybe(false)) {
return;
}
if (synthetic && args[4]->IsObject() &&
that->Set(context, realm->isolate_data()->imported_cjs_symbol(), args[4])
.IsNothing()) {
return;
}
// Initialize an empty slot for source map cache before the object is frozen.
if (that->SetPrivate(context,
realm->isolate_data()->source_map_data_private_symbol(),
Undefined(isolate))
.IsNothing()) {
return;
}
// Use the extras object as an object whose GetCreationContext() will be the
// original `context`, since the `Context` itself strictly speaking cannot
// be stored in an internal field.
Local<Object> context_object = context->GetExtrasBindingObject();
Local<Value> synthetic_evaluation_step =
synthetic ? args[3] : Undefined(realm->isolate()).As<Value>();
ModuleWrap* obj = new ModuleWrap(
realm, that, module, url, context_object, synthetic_evaluation_step);
obj->contextify_context_ = contextify_context;
args.GetReturnValue().Set(that);
}
MaybeLocal<Module> ModuleWrap::CompileSourceTextModule(
Realm* realm,
Local<String> source_text,
Local<String> url,
int line_offset,
int column_offset,
Local<PrimitiveArray> host_defined_options,
std::optional<ScriptCompiler::CachedData*> user_cached_data,
bool* cache_rejected) {
Isolate* isolate = realm->isolate();
EscapableHandleScope scope(isolate);
ScriptOrigin origin(url,
line_offset,
column_offset,
true, // is cross origin
-1, // script id
Local<Value>(), // source map URL
false, // is opaque (?)
false, // is WASM
true, // is ES Module
host_defined_options);
ScriptCompiler::CachedData* cached_data = nullptr;
CompileCacheEntry* cache_entry = nullptr;
// When compiling for the default loader, user_cached_data is std::nullptr.
// When compiling for vm.Module, it's either nullptr or a pointer to the
// cached data.
if (user_cached_data.has_value()) {
cached_data = user_cached_data.value();
} else if (realm->env()->use_compile_cache()) {
cache_entry = realm->env()->compile_cache_handler()->GetOrInsert(
source_text, url, CachedCodeType::kESM);
}
if (cache_entry != nullptr && cache_entry->cache != nullptr) {
// source will take ownership of cached_data.
cached_data = cache_entry->CopyCache();
}
ScriptCompiler::Source source(source_text, origin, cached_data);
ScriptCompiler::CompileOptions options;
if (cached_data == nullptr) {
options = ScriptCompiler::kNoCompileOptions;
} else {
options = ScriptCompiler::kConsumeCodeCache;
}
Local<Module> module;
if (!ScriptCompiler::CompileModule(isolate, &source, options)
.ToLocal(&module)) {
return scope.EscapeMaybe(MaybeLocal<Module>());
}
if (options == ScriptCompiler::kConsumeCodeCache) {
*cache_rejected = source.GetCachedData()->rejected;
}
if (cache_entry != nullptr) {
realm->env()->compile_cache_handler()->MaybeSave(
cache_entry, module, *cache_rejected);
}
return scope.Escape(module);
}
ModulePhase to_phase_constant(ModuleImportPhase phase) {
switch (phase) {
case ModuleImportPhase::kEvaluation:
return kEvaluationPhase;
case ModuleImportPhase::kSource:
return kSourcePhase;
}
UNREACHABLE();
}
static Local<Object> createImportAttributesContainer(
Realm* realm,
Isolate* isolate,
Local<FixedArray> raw_attributes,
const int elements_per_attribute) {
CHECK_EQ(raw_attributes->Length() % elements_per_attribute, 0);
size_t num_attributes = raw_attributes->Length() / elements_per_attribute;
LocalVector<Name> names(isolate, num_attributes);
LocalVector<Value> values(isolate, num_attributes);
for (int i = 0; i < raw_attributes->Length(); i += elements_per_attribute) {
int idx = i / elements_per_attribute;
names[idx] = raw_attributes->Get(realm->context(), i).As<Name>();
values[idx] = raw_attributes->Get(realm->context(), i + 1).As<Value>();
}
return Object::New(
isolate, Null(isolate), names.data(), values.data(), num_attributes);
}
static Local<Array> createModuleRequestsContainer(
Realm* realm, Isolate* isolate, Local<FixedArray> raw_requests) {
LocalVector<Value> requests(isolate, raw_requests->Length());
for (int i = 0; i < raw_requests->Length(); i++) {
Local<ModuleRequest> module_request =
raw_requests->Get(realm->context(), i).As<ModuleRequest>();
Local<String> specifier = module_request->GetSpecifier();
// Contains the import attributes for this request in the form:
// [key1, value1, source_offset1, key2, value2, source_offset2, ...].
Local<FixedArray> raw_attributes = module_request->GetImportAttributes();
Local<Object> attributes =
createImportAttributesContainer(realm, isolate, raw_attributes, 3);
ModuleImportPhase phase = module_request->GetPhase();
Local<Name> names[] = {
realm->isolate_data()->specifier_string(),
realm->isolate_data()->attributes_string(),
realm->isolate_data()->phase_string(),
};
Local<Value> values[] = {
specifier,
attributes,
Integer::New(isolate, to_phase_constant(phase)),
};
DCHECK_EQ(arraysize(names), arraysize(values));
Local<Object> request =
Object::New(isolate, Null(isolate), names, values, arraysize(names));
requests[i] = request;
}
return Array::New(isolate, requests.data(), requests.size());
}
void ModuleWrap::GetModuleRequests(const FunctionCallbackInfo<Value>& args) {
Realm* realm = Realm::GetCurrent(args);
Isolate* isolate = args.GetIsolate();
Local<Object> that = args.This();
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, that);
Local<Module> module = obj->module_.Get(isolate);
args.GetReturnValue().Set(createModuleRequestsContainer(
realm, isolate, module->GetModuleRequests()));
}
// moduleWrap.link(specifiers, moduleWraps)
void ModuleWrap::Link(const FunctionCallbackInfo<Value>& args) {
Realm* realm = Realm::GetCurrent(args);
Isolate* isolate = args.GetIsolate();
Local<Context> context = realm->context();
ModuleWrap* dependent;
ASSIGN_OR_RETURN_UNWRAP(&dependent, args.This());
CHECK_EQ(args.Length(), 2);
Local<Array> specifiers = args[0].As<Array>();
Local<Array> modules = args[1].As<Array>();
CHECK_EQ(specifiers->Length(), modules->Length());
std::vector<Global<Value>> specifiers_buffer;
if (FromV8Array(context, specifiers, &specifiers_buffer).IsNothing()) {
return;
}
std::vector<Global<Value>> modules_buffer;
if (FromV8Array(context, modules, &modules_buffer).IsNothing()) {
return;
}
for (uint32_t i = 0; i < specifiers->Length(); i++) {
Local<String> specifier_str =
specifiers_buffer[i].Get(isolate).As<String>();
Local<Object> module_object = modules_buffer[i].Get(isolate).As<Object>();
CHECK(
realm->isolate_data()->module_wrap_constructor_template()->HasInstance(
module_object));
Utf8Value specifier(isolate, specifier_str);
dependent->resolve_cache_[specifier.ToString()].Reset(isolate,
module_object);
}
}
void ModuleWrap::Instantiate(const FunctionCallbackInfo<Value>& args) {
Realm* realm = Realm::GetCurrent(args);
Isolate* isolate = args.GetIsolate();
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, args.This());
Local<Context> context = obj->context();
Local<Module> module = obj->module_.Get(isolate);
TryCatchScope try_catch(realm->env());
USE(module->InstantiateModule(
context, ResolveModuleCallback, ResolveSourceCallback));
// clear resolve cache on instantiate
obj->resolve_cache_.clear();
if (try_catch.HasCaught() && !try_catch.HasTerminated()) {
CHECK(!try_catch.Message().IsEmpty());
CHECK(!try_catch.Exception().IsEmpty());
AppendExceptionLine(realm->env(),
try_catch.Exception(),
try_catch.Message(),
ErrorHandlingMode::MODULE_ERROR);
try_catch.ReThrow();
return;
}
}
void ModuleWrap::Evaluate(const FunctionCallbackInfo<Value>& args) {
Realm* realm = Realm::GetCurrent(args);
Isolate* isolate = realm->isolate();
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, args.This());
Local<Context> context = obj->context();
Local<Module> module = obj->module_.Get(isolate);
ContextifyContext* contextify_context = obj->contextify_context_;
MicrotaskQueue* microtask_queue = nullptr;
if (contextify_context != nullptr)
microtask_queue = contextify_context->microtask_queue();
// module.evaluate(timeout, breakOnSigint)
CHECK_EQ(args.Length(), 2);
CHECK(args[0]->IsNumber());
int64_t timeout;
if (!args[0]->IntegerValue(realm->context()).To(&timeout)) {
return;
}
CHECK(args[1]->IsBoolean());
bool break_on_sigint = args[1]->IsTrue();
ShouldNotAbortOnUncaughtScope no_abort_scope(realm->env());
TryCatchScope try_catch(realm->env());
bool timed_out = false;
bool received_signal = false;
MaybeLocal<Value> result;
auto run = [&]() {
MaybeLocal<Value> result = module->Evaluate(context);
if (!result.IsEmpty() && microtask_queue)
microtask_queue->PerformCheckpoint(isolate);
return result;
};
if (break_on_sigint && timeout != -1) {
Watchdog wd(isolate, timeout, &timed_out);
SigintWatchdog swd(isolate, &received_signal);
result = run();
} else if (break_on_sigint) {
SigintWatchdog swd(isolate, &received_signal);
result = run();
} else if (timeout != -1) {
Watchdog wd(isolate, timeout, &timed_out);
result = run();
} else {
result = run();
}
if (result.IsEmpty()) {
CHECK(try_catch.HasCaught());
}
// Convert the termination exception into a regular exception.
if (timed_out || received_signal) {
if (!realm->env()->is_main_thread() && realm->env()->is_stopping()) return;
isolate->CancelTerminateExecution();
// It is possible that execution was terminated by another timeout in
// which this timeout is nested, so check whether one of the watchdogs
// from this invocation is responsible for termination.
if (timed_out) {
THROW_ERR_SCRIPT_EXECUTION_TIMEOUT(realm->env(), timeout);
} else if (received_signal) {
THROW_ERR_SCRIPT_EXECUTION_INTERRUPTED(realm->env());
}
}
if (try_catch.HasCaught()) {
if (!try_catch.HasTerminated())
try_catch.ReThrow();
return;
}
Local<Value> res;
if (result.ToLocal(&res)) {
args.GetReturnValue().Set(res);
}
}
void ModuleWrap::InstantiateSync(const FunctionCallbackInfo<Value>& args) {
Realm* realm = Realm::GetCurrent(args);
Isolate* isolate = args.GetIsolate();
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, args.This());
Local<Context> context = obj->context();
Local<Module> module = obj->module_.Get(isolate);
Environment* env = realm->env();
{
TryCatchScope try_catch(env);
USE(module->InstantiateModule(
context, ResolveModuleCallback, ResolveSourceCallback));
// clear resolve cache on instantiate
obj->resolve_cache_.clear();
if (try_catch.HasCaught() && !try_catch.HasTerminated()) {
CHECK(!try_catch.Message().IsEmpty());
CHECK(!try_catch.Exception().IsEmpty());
AppendExceptionLine(env,
try_catch.Exception(),
try_catch.Message(),
ErrorHandlingMode::MODULE_ERROR);
try_catch.ReThrow();
return;
}
}
// TODO(joyeecheung): record Module::HasTopLevelAwait() in every ModuleWrap
// and infer the asynchronicity from a module's children during linking.
args.GetReturnValue().Set(module->IsGraphAsync());
}
Maybe<void> ThrowIfPromiseRejected(Realm* realm, Local<Promise> promise) {
Isolate* isolate = realm->isolate();
Local<Context> context = realm->context();
if (promise->State() != Promise::PromiseState::kRejected) {
return JustVoid();
}
// The rejected promise is created by V8, so we don't get a chance to mark
// it as resolved before the rejection happens from evaluation. But we can
// tell the promise rejection callback to treat it as a promise rejected
// before handler was added which would remove it from the unhandled
// rejection handling, since we are converting it into an error and throw
// from here directly.
Local<Value> type =
Integer::New(isolate,
static_cast<int32_t>(
PromiseRejectEvent::kPromiseHandlerAddedAfterReject));
Local<Value> args[] = {type, promise, Undefined(isolate)};
if (realm->promise_reject_callback()
->Call(context, Undefined(isolate), arraysize(args), args)
.IsEmpty()) {
return Nothing<void>();
}
Local<Value> exception = promise->Result();
Local<Message> message = Exception::CreateMessage(isolate, exception);
AppendExceptionLine(
realm->env(), exception, message, ErrorHandlingMode::MODULE_ERROR);
isolate->ThrowException(exception);
return Nothing<void>();
}
void ThrowIfPromiseRejected(const FunctionCallbackInfo<Value>& args) {
if (!args[0]->IsPromise()) {
return;
}
ThrowIfPromiseRejected(Realm::GetCurrent(args), args[0].As<Promise>());
}
void ModuleWrap::EvaluateSync(const FunctionCallbackInfo<Value>& args) {
Realm* realm = Realm::GetCurrent(args);
Isolate* isolate = args.GetIsolate();
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, args.This());
Local<Context> context = obj->context();
Local<Module> module = obj->module_.Get(isolate);
Environment* env = realm->env();
Local<Value> result;
{
TryCatchScope try_catch(env);
if (!module->Evaluate(context).ToLocal(&result)) {
if (try_catch.HasCaught()) {
if (!try_catch.HasTerminated()) {
try_catch.ReThrow();
}
return;
}
}
}
CHECK(result->IsPromise());
Local<Promise> promise = result.As<Promise>();
if (ThrowIfPromiseRejected(realm, promise).IsNothing()) {
return;
}
if (module->IsGraphAsync()) {
CHECK(env->options()->print_required_tla);
auto stalled_messages =
std::get<1>(module->GetStalledTopLevelAwaitMessages(isolate));
if (stalled_messages.size() != 0) {
for (auto& message : stalled_messages) {
std::string reason = "Error: unexpected top-level await at ";
std::string info =
FormatErrorMessage(isolate, context, "", message, true);
reason += info;
FPrintF(stderr, "%s\n", reason);
}
}
THROW_ERR_REQUIRE_ASYNC_MODULE(env, args[0], args[1]);
return;
}
CHECK_EQ(promise->State(), Promise::PromiseState::kFulfilled);
args.GetReturnValue().Set(module->GetModuleNamespace());
}
void ModuleWrap::GetNamespaceSync(const FunctionCallbackInfo<Value>& args) {
Realm* realm = Realm::GetCurrent(args);
Isolate* isolate = args.GetIsolate();
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, args.This());
Local<Module> module = obj->module_.Get(isolate);
switch (module->GetStatus()) {
case Module::Status::kUninstantiated:
case Module::Status::kInstantiating:
return realm->env()->ThrowError(
"Cannot get namespace, module has not been instantiated");
case Module::Status::kInstantiated:
case Module::Status::kEvaluated:
case Module::Status::kErrored:
break;
case Module::Status::kEvaluating:
UNREACHABLE();
}
if (module->IsGraphAsync()) {
return THROW_ERR_REQUIRE_ASYNC_MODULE(realm->env(), args[0], args[1]);
}
Local<Value> result = module->GetModuleNamespace();
args.GetReturnValue().Set(result);
}
void ModuleWrap::GetNamespace(const FunctionCallbackInfo<Value>& args) {
Realm* realm = Realm::GetCurrent(args);
Isolate* isolate = args.GetIsolate();
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, args.This());
Local<Module> module = obj->module_.Get(isolate);
switch (module->GetStatus()) {
case Module::Status::kUninstantiated:
case Module::Status::kInstantiating:
return realm->env()->ThrowError(
"cannot get namespace, module has not been instantiated");
case Module::Status::kInstantiated:
case Module::Status::kEvaluating:
case Module::Status::kEvaluated:
case Module::Status::kErrored:
break;
default:
UNREACHABLE();
}
Local<Value> result = module->GetModuleNamespace();
args.GetReturnValue().Set(result);
}
void ModuleWrap::SetModuleSourceObject(
const FunctionCallbackInfo<Value>& args) {
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, args.This());
CHECK_EQ(args.Length(), 1);
CHECK(args[0]->IsObject());
CHECK(obj->object()
->GetInternalField(kModuleSourceObjectSlot)
.As<Value>()
->IsUndefined());
obj->object()->SetInternalField(kModuleSourceObjectSlot, args[0]);
}
void ModuleWrap::GetModuleSourceObject(
const FunctionCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, args.This());
CHECK_EQ(args.Length(), 0);
Local<Value> module_source_object =
obj->object()->GetInternalField(kModuleSourceObjectSlot).As<Value>();
if (module_source_object->IsUndefined()) {
Local<String> url = obj->object()->GetInternalField(kURLSlot).As<String>();
THROW_ERR_SOURCE_PHASE_NOT_DEFINED(isolate, url);
return;
}
args.GetReturnValue().Set(module_source_object);
}
void ModuleWrap::GetStatus(const FunctionCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, args.This());
Local<Module> module = obj->module_.Get(isolate);
args.GetReturnValue().Set(module->GetStatus());
}
void ModuleWrap::GetError(const FunctionCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, args.This());
Local<Module> module = obj->module_.Get(isolate);
args.GetReturnValue().Set(module->GetException());
}
MaybeLocal<Module> ModuleWrap::ResolveModuleCallback(
Local<Context> context,
Local<String> specifier,
Local<FixedArray> import_attributes,
Local<Module> referrer) {
Isolate* isolate = context->GetIsolate();
Environment* env = Environment::GetCurrent(context);
if (env == nullptr) {
THROW_ERR_EXECUTION_ENVIRONMENT_NOT_AVAILABLE(isolate);
return MaybeLocal<Module>();
}
Utf8Value specifier_utf8(isolate, specifier);
std::string specifier_std(*specifier_utf8, specifier_utf8.length());
ModuleWrap* dependent = GetFromModule(env, referrer);
if (dependent == nullptr) {
THROW_ERR_VM_MODULE_LINK_FAILURE(
env, "request for '%s' is from invalid module", specifier_std);
return MaybeLocal<Module>();
}
if (dependent->resolve_cache_.count(specifier_std) != 1) {
THROW_ERR_VM_MODULE_LINK_FAILURE(
env, "request for '%s' is not in cache", specifier_std);
return MaybeLocal<Module>();
}
Local<Object> module_object =
dependent->resolve_cache_[specifier_std].Get(isolate);
if (module_object.IsEmpty() || !module_object->IsObject()) {
THROW_ERR_VM_MODULE_LINK_FAILURE(
env, "request for '%s' did not return an object", specifier_std);
return MaybeLocal<Module>();
}
ModuleWrap* module;
ASSIGN_OR_RETURN_UNWRAP(&module, module_object, MaybeLocal<Module>());
return module->module_.Get(isolate);
}
MaybeLocal<Object> ModuleWrap::ResolveSourceCallback(
Local<Context> context,
Local<String> specifier,
Local<FixedArray> import_attributes,
Local<Module> referrer) {
Isolate* isolate = context->GetIsolate();
Environment* env = Environment::GetCurrent(context);
if (env == nullptr) {
THROW_ERR_EXECUTION_ENVIRONMENT_NOT_AVAILABLE(isolate);
return MaybeLocal<Object>();
}
Utf8Value specifier_utf8(isolate, specifier);
std::string specifier_std(*specifier_utf8, specifier_utf8.length());
ModuleWrap* dependent = GetFromModule(env, referrer);
if (dependent == nullptr) {
THROW_ERR_VM_MODULE_LINK_FAILURE(
env, "request for '%s' is from invalid module", specifier_std);
return MaybeLocal<Object>();
}
if (dependent->resolve_cache_.count(specifier_std) != 1) {
THROW_ERR_VM_MODULE_LINK_FAILURE(
env, "request for '%s' is not in cache", specifier_std);
return MaybeLocal<Object>();
}
Local<Object> module_object =
dependent->resolve_cache_[specifier_std].Get(isolate);
if (module_object.IsEmpty() || !module_object->IsObject()) {
THROW_ERR_VM_MODULE_LINK_FAILURE(
env, "request for '%s' did not return an object", specifier_std);
return MaybeLocal<Object>();
}
ModuleWrap* module;
ASSIGN_OR_RETURN_UNWRAP(&module, module_object, MaybeLocal<Object>());
Local<Value> module_source_object =
module->object()->GetInternalField(kModuleSourceObjectSlot).As<Value>();
if (module_source_object->IsUndefined()) {
Local<String> url =
module->object()->GetInternalField(kURLSlot).As<String>();
THROW_ERR_SOURCE_PHASE_NOT_DEFINED(isolate, url);
return MaybeLocal<Object>();
}
CHECK(module_source_object->IsObject());
return module_source_object.As<Object>();
}
static MaybeLocal<Promise> ImportModuleDynamicallyWithPhase(
Local<Context> context,
Local<Data> host_defined_options,
Local<Value> resource_name,
Local<String> specifier,
ModuleImportPhase phase,
Local<FixedArray> import_attributes) {
Isolate* isolate = context->GetIsolate();
Environment* env = Environment::GetCurrent(context);
if (env == nullptr) {
THROW_ERR_EXECUTION_ENVIRONMENT_NOT_AVAILABLE(isolate);
return MaybeLocal<Promise>();
}
Realm* realm = Realm::GetCurrent(context);
if (realm == nullptr) {
// Fallback to the principal realm if it's in a vm context.
realm = env->principal_realm();
}
EscapableHandleScope handle_scope(isolate);
Local<Function> import_callback =
realm->host_import_module_dynamically_callback();
Local<Value> id;
Local<FixedArray> options = host_defined_options.As<FixedArray>();
// Get referrer id symbol from the host-defined options.
// If the host-defined options are empty, get the referrer id symbol
// from the realm global object.
if (options->Length() == HostDefinedOptions::kLength) {
id = options->Get(context, HostDefinedOptions::kID).As<Symbol>();
} else if (!context->Global()
->GetPrivate(context, env->host_defined_option_symbol())
.ToLocal(&id)) {
return MaybeLocal<Promise>();
}