| // Copyright 2019 the V8 project 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 "src/objects/source-text-module.h" |
| |
| #include "src/api/api-inl.h" |
| #include "src/ast/modules.h" |
| #include "src/builtins/accessors.h" |
| #include "src/objects/js-generator-inl.h" |
| #include "src/objects/module-inl.h" |
| #include "src/objects/objects-inl.h" |
| #include "src/objects/shared-function-info.h" |
| #include "src/utils/ostreams.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| struct StringHandleHash { |
| V8_INLINE size_t operator()(Handle<String> string) const { |
| return string->Hash(); |
| } |
| }; |
| |
| struct StringHandleEqual { |
| V8_INLINE bool operator()(Handle<String> lhs, Handle<String> rhs) const { |
| return lhs->Equals(*rhs); |
| } |
| }; |
| |
| class UnorderedStringSet |
| : public std::unordered_set<Handle<String>, StringHandleHash, |
| StringHandleEqual, |
| ZoneAllocator<Handle<String>>> { |
| public: |
| explicit UnorderedStringSet(Zone* zone) |
| : std::unordered_set<Handle<String>, StringHandleHash, StringHandleEqual, |
| ZoneAllocator<Handle<String>>>( |
| 2 /* bucket count */, StringHandleHash(), StringHandleEqual(), |
| ZoneAllocator<Handle<String>>(zone)) {} |
| }; |
| |
| class UnorderedStringMap |
| : public std::unordered_map< |
| Handle<String>, Handle<Object>, StringHandleHash, StringHandleEqual, |
| ZoneAllocator<std::pair<const Handle<String>, Handle<Object>>>> { |
| public: |
| explicit UnorderedStringMap(Zone* zone) |
| : std::unordered_map< |
| Handle<String>, Handle<Object>, StringHandleHash, StringHandleEqual, |
| ZoneAllocator<std::pair<const Handle<String>, Handle<Object>>>>( |
| 2 /* bucket count */, StringHandleHash(), StringHandleEqual(), |
| ZoneAllocator<std::pair<const Handle<String>, Handle<Object>>>( |
| zone)) {} |
| }; |
| |
| class Module::ResolveSet |
| : public std::unordered_map< |
| Handle<Module>, UnorderedStringSet*, ModuleHandleHash, |
| ModuleHandleEqual, |
| ZoneAllocator<std::pair<const Handle<Module>, UnorderedStringSet*>>> { |
| public: |
| explicit ResolveSet(Zone* zone) |
| : std::unordered_map<Handle<Module>, UnorderedStringSet*, |
| ModuleHandleHash, ModuleHandleEqual, |
| ZoneAllocator<std::pair<const Handle<Module>, |
| UnorderedStringSet*>>>( |
| 2 /* bucket count */, ModuleHandleHash(), ModuleHandleEqual(), |
| ZoneAllocator<std::pair<const Handle<Module>, UnorderedStringSet*>>( |
| zone)), |
| zone_(zone) {} |
| |
| Zone* zone() const { return zone_; } |
| |
| private: |
| Zone* zone_; |
| }; |
| |
| SharedFunctionInfo SourceTextModule::GetSharedFunctionInfo() const { |
| DisallowHeapAllocation no_alloc; |
| DCHECK_NE(status(), Module::kEvaluating); |
| DCHECK_NE(status(), Module::kEvaluated); |
| switch (status()) { |
| case kUninstantiated: |
| case kPreInstantiating: |
| DCHECK(code().IsSharedFunctionInfo()); |
| return SharedFunctionInfo::cast(code()); |
| case kInstantiating: |
| DCHECK(code().IsJSFunction()); |
| return JSFunction::cast(code()).shared(); |
| case kInstantiated: |
| DCHECK(code().IsJSGeneratorObject()); |
| return JSGeneratorObject::cast(code()).function().shared(); |
| case kEvaluating: |
| case kEvaluated: |
| case kErrored: |
| UNREACHABLE(); |
| } |
| |
| UNREACHABLE(); |
| } |
| |
| int SourceTextModule::ExportIndex(int cell_index) { |
| DCHECK_EQ(SourceTextModuleDescriptor::GetCellIndexKind(cell_index), |
| SourceTextModuleDescriptor::kExport); |
| return cell_index - 1; |
| } |
| |
| int SourceTextModule::ImportIndex(int cell_index) { |
| DCHECK_EQ(SourceTextModuleDescriptor::GetCellIndexKind(cell_index), |
| SourceTextModuleDescriptor::kImport); |
| return -cell_index - 1; |
| } |
| |
| void SourceTextModule::CreateIndirectExport( |
| Isolate* isolate, Handle<SourceTextModule> module, Handle<String> name, |
| Handle<SourceTextModuleInfoEntry> entry) { |
| Handle<ObjectHashTable> exports(module->exports(), isolate); |
| DCHECK(exports->Lookup(name).IsTheHole(isolate)); |
| exports = ObjectHashTable::Put(exports, name, entry); |
| module->set_exports(*exports); |
| } |
| |
| void SourceTextModule::CreateExport(Isolate* isolate, |
| Handle<SourceTextModule> module, |
| int cell_index, Handle<FixedArray> names) { |
| DCHECK_LT(0, names->length()); |
| Handle<Cell> cell = |
| isolate->factory()->NewCell(isolate->factory()->undefined_value()); |
| module->regular_exports().set(ExportIndex(cell_index), *cell); |
| |
| Handle<ObjectHashTable> exports(module->exports(), isolate); |
| for (int i = 0, n = names->length(); i < n; ++i) { |
| Handle<String> name(String::cast(names->get(i)), isolate); |
| DCHECK(exports->Lookup(name).IsTheHole(isolate)); |
| exports = ObjectHashTable::Put(exports, name, cell); |
| } |
| module->set_exports(*exports); |
| } |
| |
| Cell SourceTextModule::GetCell(int cell_index) { |
| DisallowHeapAllocation no_gc; |
| Object cell; |
| switch (SourceTextModuleDescriptor::GetCellIndexKind(cell_index)) { |
| case SourceTextModuleDescriptor::kImport: |
| cell = regular_imports().get(ImportIndex(cell_index)); |
| break; |
| case SourceTextModuleDescriptor::kExport: |
| cell = regular_exports().get(ExportIndex(cell_index)); |
| break; |
| case SourceTextModuleDescriptor::kInvalid: |
| UNREACHABLE(); |
| break; |
| } |
| return Cell::cast(cell); |
| } |
| |
| Handle<Object> SourceTextModule::LoadVariable(Isolate* isolate, |
| Handle<SourceTextModule> module, |
| int cell_index) { |
| return handle(module->GetCell(cell_index).value(), isolate); |
| } |
| |
| void SourceTextModule::StoreVariable(Handle<SourceTextModule> module, |
| int cell_index, Handle<Object> value) { |
| DisallowHeapAllocation no_gc; |
| DCHECK_EQ(SourceTextModuleDescriptor::GetCellIndexKind(cell_index), |
| SourceTextModuleDescriptor::kExport); |
| module->GetCell(cell_index).set_value(*value); |
| } |
| |
| MaybeHandle<Cell> SourceTextModule::ResolveExport( |
| Isolate* isolate, Handle<SourceTextModule> module, |
| Handle<String> module_specifier, Handle<String> export_name, |
| MessageLocation loc, bool must_resolve, Module::ResolveSet* resolve_set) { |
| Handle<Object> object(module->exports().Lookup(export_name), isolate); |
| if (object->IsCell()) { |
| // Already resolved (e.g. because it's a local export). |
| return Handle<Cell>::cast(object); |
| } |
| |
| // Check for cycle before recursing. |
| { |
| // Attempt insertion with a null string set. |
| auto result = resolve_set->insert({module, nullptr}); |
| UnorderedStringSet*& name_set = result.first->second; |
| if (result.second) { |
| // |module| wasn't in the map previously, so allocate a new name set. |
| Zone* zone = resolve_set->zone(); |
| name_set = |
| new (zone->New(sizeof(UnorderedStringSet))) UnorderedStringSet(zone); |
| } else if (name_set->count(export_name)) { |
| // Cycle detected. |
| if (must_resolve) { |
| return isolate->Throw<Cell>( |
| isolate->factory()->NewSyntaxError( |
| MessageTemplate::kCyclicModuleDependency, export_name, |
| module_specifier), |
| &loc); |
| } |
| return MaybeHandle<Cell>(); |
| } |
| name_set->insert(export_name); |
| } |
| |
| if (object->IsSourceTextModuleInfoEntry()) { |
| // Not yet resolved indirect export. |
| Handle<SourceTextModuleInfoEntry> entry = |
| Handle<SourceTextModuleInfoEntry>::cast(object); |
| Handle<String> import_name(String::cast(entry->import_name()), isolate); |
| Handle<Script> script(module->script(), isolate); |
| MessageLocation new_loc(script, entry->beg_pos(), entry->end_pos()); |
| |
| Handle<Cell> cell; |
| if (!ResolveImport(isolate, module, import_name, entry->module_request(), |
| new_loc, true, resolve_set) |
| .ToHandle(&cell)) { |
| DCHECK(isolate->has_pending_exception()); |
| return MaybeHandle<Cell>(); |
| } |
| |
| // The export table may have changed but the entry in question should be |
| // unchanged. |
| Handle<ObjectHashTable> exports(module->exports(), isolate); |
| DCHECK(exports->Lookup(export_name).IsSourceTextModuleInfoEntry()); |
| |
| exports = ObjectHashTable::Put(exports, export_name, cell); |
| module->set_exports(*exports); |
| return cell; |
| } |
| |
| DCHECK(object->IsTheHole(isolate)); |
| return SourceTextModule::ResolveExportUsingStarExports( |
| isolate, module, module_specifier, export_name, loc, must_resolve, |
| resolve_set); |
| } |
| |
| MaybeHandle<Cell> SourceTextModule::ResolveImport( |
| Isolate* isolate, Handle<SourceTextModule> module, Handle<String> name, |
| int module_request, MessageLocation loc, bool must_resolve, |
| Module::ResolveSet* resolve_set) { |
| Handle<Module> requested_module( |
| Module::cast(module->requested_modules().get(module_request)), isolate); |
| Handle<String> specifier( |
| String::cast(module->info().module_requests().get(module_request)), |
| isolate); |
| MaybeHandle<Cell> result = |
| Module::ResolveExport(isolate, requested_module, specifier, name, loc, |
| must_resolve, resolve_set); |
| DCHECK_IMPLIES(isolate->has_pending_exception(), result.is_null()); |
| return result; |
| } |
| |
| MaybeHandle<Cell> SourceTextModule::ResolveExportUsingStarExports( |
| Isolate* isolate, Handle<SourceTextModule> module, |
| Handle<String> module_specifier, Handle<String> export_name, |
| MessageLocation loc, bool must_resolve, Module::ResolveSet* resolve_set) { |
| if (!export_name->Equals(ReadOnlyRoots(isolate).default_string())) { |
| // Go through all star exports looking for the given name. If multiple star |
| // exports provide the name, make sure they all map it to the same cell. |
| Handle<Cell> unique_cell; |
| Handle<FixedArray> special_exports(module->info().special_exports(), |
| isolate); |
| for (int i = 0, n = special_exports->length(); i < n; ++i) { |
| i::Handle<i::SourceTextModuleInfoEntry> entry( |
| i::SourceTextModuleInfoEntry::cast(special_exports->get(i)), isolate); |
| if (!entry->export_name().IsUndefined(isolate)) { |
| continue; // Indirect export. |
| } |
| |
| Handle<Script> script(module->script(), isolate); |
| MessageLocation new_loc(script, entry->beg_pos(), entry->end_pos()); |
| |
| Handle<Cell> cell; |
| if (ResolveImport(isolate, module, export_name, entry->module_request(), |
| new_loc, false, resolve_set) |
| .ToHandle(&cell)) { |
| if (unique_cell.is_null()) unique_cell = cell; |
| if (*unique_cell != *cell) { |
| return isolate->Throw<Cell>(isolate->factory()->NewSyntaxError( |
| MessageTemplate::kAmbiguousExport, |
| module_specifier, export_name), |
| &loc); |
| } |
| } else if (isolate->has_pending_exception()) { |
| return MaybeHandle<Cell>(); |
| } |
| } |
| |
| if (!unique_cell.is_null()) { |
| // Found a unique star export for this name. |
| Handle<ObjectHashTable> exports(module->exports(), isolate); |
| DCHECK(exports->Lookup(export_name).IsTheHole(isolate)); |
| exports = ObjectHashTable::Put(exports, export_name, unique_cell); |
| module->set_exports(*exports); |
| return unique_cell; |
| } |
| } |
| |
| // Unresolvable. |
| if (must_resolve) { |
| return isolate->Throw<Cell>( |
| isolate->factory()->NewSyntaxError(MessageTemplate::kUnresolvableExport, |
| module_specifier, export_name), |
| &loc); |
| } |
| return MaybeHandle<Cell>(); |
| } |
| |
| bool SourceTextModule::PrepareInstantiate( |
| Isolate* isolate, Handle<SourceTextModule> module, |
| v8::Local<v8::Context> context, v8::Module::ResolveCallback callback) { |
| // Obtain requested modules. |
| Handle<SourceTextModuleInfo> module_info(module->info(), isolate); |
| Handle<FixedArray> module_requests(module_info->module_requests(), isolate); |
| Handle<FixedArray> requested_modules(module->requested_modules(), isolate); |
| for (int i = 0, length = module_requests->length(); i < length; ++i) { |
| Handle<String> specifier(String::cast(module_requests->get(i)), isolate); |
| v8::Local<v8::Module> api_requested_module; |
| if (!callback(context, v8::Utils::ToLocal(specifier), |
| v8::Utils::ToLocal(Handle<Module>::cast(module))) |
| .ToLocal(&api_requested_module)) { |
| isolate->PromoteScheduledException(); |
| return false; |
| } |
| Handle<Module> requested_module = Utils::OpenHandle(*api_requested_module); |
| requested_modules->set(i, *requested_module); |
| } |
| |
| // Recurse. |
| for (int i = 0, length = requested_modules->length(); i < length; ++i) { |
| Handle<Module> requested_module(Module::cast(requested_modules->get(i)), |
| isolate); |
| if (!Module::PrepareInstantiate(isolate, requested_module, context, |
| callback)) { |
| return false; |
| } |
| } |
| |
| // Set up local exports. |
| // TODO(neis): Create regular_exports array here instead of in factory method? |
| for (int i = 0, n = module_info->RegularExportCount(); i < n; ++i) { |
| int cell_index = module_info->RegularExportCellIndex(i); |
| Handle<FixedArray> export_names(module_info->RegularExportExportNames(i), |
| isolate); |
| CreateExport(isolate, module, cell_index, export_names); |
| } |
| |
| // Partially set up indirect exports. |
| // For each indirect export, we create the appropriate slot in the export |
| // table and store its SourceTextModuleInfoEntry there. When we later find |
| // the correct Cell in the module that actually provides the value, we replace |
| // the SourceTextModuleInfoEntry by that Cell (see ResolveExport). |
| Handle<FixedArray> special_exports(module_info->special_exports(), isolate); |
| for (int i = 0, n = special_exports->length(); i < n; ++i) { |
| Handle<SourceTextModuleInfoEntry> entry( |
| SourceTextModuleInfoEntry::cast(special_exports->get(i)), isolate); |
| Handle<Object> export_name(entry->export_name(), isolate); |
| if (export_name->IsUndefined(isolate)) continue; // Star export. |
| CreateIndirectExport(isolate, module, Handle<String>::cast(export_name), |
| entry); |
| } |
| |
| DCHECK_EQ(module->status(), kPreInstantiating); |
| return true; |
| } |
| |
| bool SourceTextModule::RunInitializationCode(Isolate* isolate, |
| Handle<SourceTextModule> module) { |
| DCHECK_EQ(module->status(), kInstantiating); |
| Handle<JSFunction> function(JSFunction::cast(module->code()), isolate); |
| DCHECK_EQ(MODULE_SCOPE, function->shared().scope_info().scope_type()); |
| Handle<Object> receiver = isolate->factory()->undefined_value(); |
| Handle<Object> argv[] = {module}; |
| MaybeHandle<Object> maybe_generator = |
| Execution::Call(isolate, function, receiver, arraysize(argv), argv); |
| Handle<Object> generator; |
| if (!maybe_generator.ToHandle(&generator)) { |
| DCHECK(isolate->has_pending_exception()); |
| return false; |
| } |
| DCHECK_EQ(*function, Handle<JSGeneratorObject>::cast(generator)->function()); |
| module->set_code(*generator); |
| return true; |
| } |
| |
| bool SourceTextModule::MaybeTransitionComponent( |
| Isolate* isolate, Handle<SourceTextModule> module, |
| ZoneForwardList<Handle<SourceTextModule>>* stack, Status new_status) { |
| DCHECK(new_status == kInstantiated || new_status == kEvaluated); |
| SLOW_DCHECK( |
| // {module} is on the {stack}. |
| std::count_if(stack->begin(), stack->end(), |
| [&](Handle<Module> m) { return *m == *module; }) == 1); |
| DCHECK_LE(module->dfs_ancestor_index(), module->dfs_index()); |
| if (module->dfs_ancestor_index() == module->dfs_index()) { |
| // This is the root of its strongly connected component. |
| Handle<SourceTextModule> ancestor; |
| do { |
| ancestor = stack->front(); |
| stack->pop_front(); |
| DCHECK_EQ(ancestor->status(), |
| new_status == kInstantiated ? kInstantiating : kEvaluating); |
| if (new_status == kInstantiated) { |
| if (!SourceTextModule::RunInitializationCode(isolate, ancestor)) |
| return false; |
| } |
| ancestor->SetStatus(new_status); |
| } while (*ancestor != *module); |
| } |
| return true; |
| } |
| |
| bool SourceTextModule::FinishInstantiate( |
| Isolate* isolate, Handle<SourceTextModule> module, |
| ZoneForwardList<Handle<SourceTextModule>>* stack, unsigned* dfs_index, |
| Zone* zone) { |
| // Instantiate SharedFunctionInfo and mark module as instantiating for |
| // the recursion. |
| Handle<SharedFunctionInfo> shared(SharedFunctionInfo::cast(module->code()), |
| isolate); |
| Handle<JSFunction> function = |
| isolate->factory()->NewFunctionFromSharedFunctionInfo( |
| shared, isolate->native_context()); |
| module->set_code(*function); |
| module->SetStatus(kInstantiating); |
| module->set_dfs_index(*dfs_index); |
| module->set_dfs_ancestor_index(*dfs_index); |
| stack->push_front(module); |
| (*dfs_index)++; |
| |
| // Recurse. |
| Handle<FixedArray> requested_modules(module->requested_modules(), isolate); |
| for (int i = 0, length = requested_modules->length(); i < length; ++i) { |
| Handle<Module> requested_module(Module::cast(requested_modules->get(i)), |
| isolate); |
| if (!Module::FinishInstantiate(isolate, requested_module, stack, dfs_index, |
| zone)) { |
| return false; |
| } |
| |
| DCHECK_NE(requested_module->status(), kEvaluating); |
| DCHECK_GE(requested_module->status(), kInstantiating); |
| SLOW_DCHECK( |
| // {requested_module} is instantiating iff it's on the {stack}. |
| (requested_module->status() == kInstantiating) == |
| std::count_if(stack->begin(), stack->end(), [&](Handle<Module> m) { |
| return *m == *requested_module; |
| })); |
| |
| if (requested_module->status() == kInstantiating) { |
| // SyntheticModules go straight to kInstantiated so this must be a |
| // SourceTextModule |
| module->set_dfs_ancestor_index( |
| std::min(module->dfs_ancestor_index(), |
| Handle<SourceTextModule>::cast(requested_module) |
| ->dfs_ancestor_index())); |
| } |
| } |
| |
| Handle<Script> script(module->script(), isolate); |
| Handle<SourceTextModuleInfo> module_info(module->info(), isolate); |
| |
| // Resolve imports. |
| Handle<FixedArray> regular_imports(module_info->regular_imports(), isolate); |
| for (int i = 0, n = regular_imports->length(); i < n; ++i) { |
| Handle<SourceTextModuleInfoEntry> entry( |
| SourceTextModuleInfoEntry::cast(regular_imports->get(i)), isolate); |
| Handle<String> name(String::cast(entry->import_name()), isolate); |
| MessageLocation loc(script, entry->beg_pos(), entry->end_pos()); |
| ResolveSet resolve_set(zone); |
| Handle<Cell> cell; |
| if (!ResolveImport(isolate, module, name, entry->module_request(), loc, |
| true, &resolve_set) |
| .ToHandle(&cell)) { |
| return false; |
| } |
| module->regular_imports().set(ImportIndex(entry->cell_index()), *cell); |
| } |
| |
| // Resolve indirect exports. |
| Handle<FixedArray> special_exports(module_info->special_exports(), isolate); |
| for (int i = 0, n = special_exports->length(); i < n; ++i) { |
| Handle<SourceTextModuleInfoEntry> entry( |
| SourceTextModuleInfoEntry::cast(special_exports->get(i)), isolate); |
| Handle<Object> name(entry->export_name(), isolate); |
| if (name->IsUndefined(isolate)) continue; // Star export. |
| MessageLocation loc(script, entry->beg_pos(), entry->end_pos()); |
| ResolveSet resolve_set(zone); |
| if (ResolveExport(isolate, module, Handle<String>(), |
| Handle<String>::cast(name), loc, true, &resolve_set) |
| .is_null()) { |
| return false; |
| } |
| } |
| |
| return MaybeTransitionComponent(isolate, module, stack, kInstantiated); |
| } |
| |
| void SourceTextModule::FetchStarExports(Isolate* isolate, |
| Handle<SourceTextModule> module, |
| Zone* zone, |
| UnorderedModuleSet* visited) { |
| DCHECK_GE(module->status(), Module::kInstantiating); |
| |
| if (module->module_namespace().IsJSModuleNamespace()) return; // Shortcut. |
| |
| bool cycle = !visited->insert(module).second; |
| if (cycle) return; |
| Handle<ObjectHashTable> exports(module->exports(), isolate); |
| UnorderedStringMap more_exports(zone); |
| |
| // TODO(neis): Only allocate more_exports if there are star exports. |
| // Maybe split special_exports into indirect_exports and star_exports. |
| |
| ReadOnlyRoots roots(isolate); |
| Handle<FixedArray> special_exports(module->info().special_exports(), isolate); |
| for (int i = 0, n = special_exports->length(); i < n; ++i) { |
| Handle<SourceTextModuleInfoEntry> entry( |
| SourceTextModuleInfoEntry::cast(special_exports->get(i)), isolate); |
| if (!entry->export_name().IsUndefined(roots)) { |
| continue; // Indirect export. |
| } |
| |
| Handle<Module> requested_module( |
| Module::cast(module->requested_modules().get(entry->module_request())), |
| isolate); |
| |
| // Recurse. |
| if (requested_module->IsSourceTextModule()) |
| FetchStarExports(isolate, |
| Handle<SourceTextModule>::cast(requested_module), zone, |
| visited); |
| |
| // Collect all of [requested_module]'s exports that must be added to |
| // [module]'s exports (i.e. to [exports]). We record these in |
| // [more_exports]. Ambiguities (conflicting exports) are marked by mapping |
| // the name to undefined instead of a Cell. |
| Handle<ObjectHashTable> requested_exports(requested_module->exports(), |
| isolate); |
| for (int i = 0, n = requested_exports->Capacity(); i < n; ++i) { |
| Object key; |
| if (!requested_exports->ToKey(roots, i, &key)) continue; |
| Handle<String> name(String::cast(key), isolate); |
| |
| if (name->Equals(roots.default_string())) continue; |
| if (!exports->Lookup(name).IsTheHole(roots)) continue; |
| |
| Handle<Cell> cell(Cell::cast(requested_exports->ValueAt(i)), isolate); |
| auto insert_result = more_exports.insert(std::make_pair(name, cell)); |
| if (!insert_result.second) { |
| auto it = insert_result.first; |
| if (*it->second == *cell || it->second->IsUndefined(roots)) { |
| // We already recorded this mapping before, or the name is already |
| // known to be ambiguous. In either case, there's nothing to do. |
| } else { |
| DCHECK(it->second->IsCell()); |
| // Different star exports provide different cells for this name, hence |
| // mark the name as ambiguous. |
| it->second = roots.undefined_value_handle(); |
| } |
| } |
| } |
| } |
| |
| // Copy [more_exports] into [exports]. |
| for (const auto& elem : more_exports) { |
| if (elem.second->IsUndefined(isolate)) continue; // Ambiguous export. |
| DCHECK(!elem.first->Equals(ReadOnlyRoots(isolate).default_string())); |
| DCHECK(elem.second->IsCell()); |
| exports = ObjectHashTable::Put(exports, elem.first, elem.second); |
| } |
| module->set_exports(*exports); |
| } |
| |
| Handle<JSModuleNamespace> SourceTextModule::GetModuleNamespace( |
| Isolate* isolate, Handle<SourceTextModule> module, int module_request) { |
| Handle<Module> requested_module( |
| Module::cast(module->requested_modules().get(module_request)), isolate); |
| return Module::GetModuleNamespace(isolate, requested_module); |
| } |
| |
| MaybeHandle<Object> SourceTextModule::Evaluate( |
| Isolate* isolate, Handle<SourceTextModule> module, |
| ZoneForwardList<Handle<SourceTextModule>>* stack, unsigned* dfs_index) { |
| Handle<JSGeneratorObject> generator(JSGeneratorObject::cast(module->code()), |
| isolate); |
| module->set_code( |
| generator->function().shared().scope_info().ModuleDescriptorInfo()); |
| module->SetStatus(kEvaluating); |
| module->set_dfs_index(*dfs_index); |
| module->set_dfs_ancestor_index(*dfs_index); |
| stack->push_front(module); |
| (*dfs_index)++; |
| |
| // Recursion. |
| Handle<FixedArray> requested_modules(module->requested_modules(), isolate); |
| for (int i = 0, length = requested_modules->length(); i < length; ++i) { |
| Handle<Module> requested_module(Module::cast(requested_modules->get(i)), |
| isolate); |
| RETURN_ON_EXCEPTION( |
| isolate, Module::Evaluate(isolate, requested_module, stack, dfs_index), |
| Object); |
| |
| DCHECK_GE(requested_module->status(), kEvaluating); |
| DCHECK_NE(requested_module->status(), kErrored); |
| SLOW_DCHECK( |
| // {requested_module} is evaluating iff it's on the {stack}. |
| (requested_module->status() == kEvaluating) == |
| std::count_if(stack->begin(), stack->end(), [&](Handle<Module> m) { |
| return *m == *requested_module; |
| })); |
| |
| if (requested_module->status() == kEvaluating) { |
| // SyntheticModules go straight to kEvaluated so this must be a |
| // SourceTextModule |
| module->set_dfs_ancestor_index( |
| std::min(module->dfs_ancestor_index(), |
| Handle<SourceTextModule>::cast(requested_module) |
| ->dfs_ancestor_index())); |
| } |
| } |
| |
| // Evaluation of module body. |
| Handle<JSFunction> resume( |
| isolate->native_context()->generator_next_internal(), isolate); |
| Handle<Object> result; |
| ASSIGN_RETURN_ON_EXCEPTION( |
| isolate, result, Execution::Call(isolate, resume, generator, 0, nullptr), |
| Object); |
| DCHECK(JSIteratorResult::cast(*result).done().BooleanValue(isolate)); |
| |
| CHECK(MaybeTransitionComponent(isolate, module, stack, kEvaluated)); |
| return handle(JSIteratorResult::cast(*result).value(), isolate); |
| } |
| |
| void SourceTextModule::Reset(Isolate* isolate, |
| Handle<SourceTextModule> module) { |
| Factory* factory = isolate->factory(); |
| |
| DCHECK(module->import_meta().IsTheHole(isolate)); |
| |
| Handle<FixedArray> regular_exports = |
| factory->NewFixedArray(module->regular_exports().length()); |
| Handle<FixedArray> regular_imports = |
| factory->NewFixedArray(module->regular_imports().length()); |
| Handle<FixedArray> requested_modules = |
| factory->NewFixedArray(module->requested_modules().length()); |
| |
| if (module->status() == kInstantiating) { |
| module->set_code(JSFunction::cast(module->code()).shared()); |
| } |
| module->set_regular_exports(*regular_exports); |
| module->set_regular_imports(*regular_imports); |
| module->set_requested_modules(*requested_modules); |
| module->set_dfs_index(-1); |
| module->set_dfs_ancestor_index(-1); |
| } |
| |
| } // namespace internal |
| } // namespace v8 |