mirrors/ladybird
0
0
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2025-09-15 05:52:19 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 10

LibJS: Allow host to create ShadowRealm global object

Browse source 
This implements the proposed update to the ShadowRealm proposal for
integrating the ShadowRealm specification into the web platform.
This commit is contained in:
Shannon Booth 2024-10-23 18:15:19 +13:00 • committed by Andrew Kaster
commit d1fc76bffd
Notes: github-actions[bot] 2024-10-23 17:30:56 +00:00
2 changed files with 33 additions and 27 deletions
Download patch file Download diff file Expand all files Collapse all files

59
Userland/Libraries/LibJS/Runtime/ShadowRealmConstructor.cpp
View file

@ -39,7 +39,30 @@ ThrowCompletionOr<Value> ShadowRealmConstructor::call()
return vm.throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, vm.names.ShadowRealm);
}
// https://github.com/tc39/proposal-shadowrealm/pull/392
static ThrowCompletionOr<NonnullGCPtr<Object>> initialize_shadow_realm(ShadowRealm& object)
{
auto& vm = object.vm();
// 1. Let context be the running Javascript execution context.
auto& context = vm.running_execution_context();
// 2. Let realm be the Realm of context.
auto& realm = *context.realm;
// 3. Return ? HostInitializeShadowRealm(realm, context, O).
if (vm.host_initialize_shadow_realm)
return TRY(vm.host_initialize_shadow_realm(realm, context.copy(), object));
// AD-HOC: Fallback for when there is no host defined implementation.
vm.pop_execution_context();
object.set_execution_context(vm.running_execution_context().copy());
object.set_shadow_realm(*vm.running_execution_context().realm);
return Object::create(realm, realm.intrinsics().object_prototype());
}
// 3.2.1 ShadowRealm ( ), https://tc39.es/proposal-shadowrealm/#sec-shadowrealm
// https://github.com/tc39/proposal-shadowrealm/pull/392
ThrowCompletionOr<NonnullGCPtr<Object>> ShadowRealmConstructor::construct(FunctionObject& new_target)
{
auto& vm = this->vm();
@ -47,37 +70,19 @@ ThrowCompletionOr<NonnullGCPtr<Object>> ShadowRealmConstructor::construct(Functi
// 2. Let O be ? OrdinaryCreateFromConstructor(NewTarget, "%ShadowRealm.prototype%", « [[ShadowRealm]], [[ExecutionContext]] »).
auto object = TRY(ordinary_create_from_constructor<ShadowRealm>(vm, new_target, &Intrinsics::shadow_realm_prototype));
// 3. Let realmRec be CreateRealm().
auto realm = MUST_OR_THROW_OOM(Realm::create(vm));
// 3. Perform ? InitializeHostDefinedRealm(). The customizations for creating the global object are to return ? InitializeShadowRealm().
// 4. Let context be the running Javascript execution context.
auto context = TRY(Realm::initialize_host_defined_realm(vm, [&object](JS::Realm&) -> JS::Object* { return MUST(initialize_shadow_realm(object)); }, nullptr));
// 4. Set O.[[ShadowRealm]] to realmRec.
object->set_shadow_realm(realm);
// 5. Let context be a new execution context.
auto context = ExecutionContext::create();
// 6. Set the Function of context to null.
context->function = nullptr;
// 7. Set the Realm of context to realmRec.
context->realm = realm;
// 8. Set the ScriptOrModule of context to null.
// Note: This is already the default value.
// 9. Set O.[[ExecutionContext]] to context.
// 5. Set O.[[ExecutionContext]] to context.
// 6. Let realmRec be the Realm of context.
auto& realm_record = *context->realm;
object->set_execution_context(move(context));
// 10. Perform ? SetRealmGlobalObject(realmRec, undefined, undefined).
realm->set_global_object(nullptr, nullptr);
// 7. Set O.[[ShadowRealm]] to realmRec.
object->set_shadow_realm(realm_record);
// 11. Perform ? SetDefaultGlobalBindings(O.[[ShadowRealm]]).
auto& global_object = set_default_global_bindings(object->shadow_realm());
// FIXME: 12. Perform ? HostInitializeShadowRealm(O.[[ShadowRealm]]).
global_object.initialize(object->shadow_realm());
// 13. Return O.
// 8. Return O.
return object;
}

1
Userland/Libraries/LibJS/Runtime/VM.h
View file

@ -275,6 +275,7 @@ public:
Function<ThrowCompletionOr<void>(Object&)> host_ensure_can_add_private_element;
Function<ThrowCompletionOr<HandledByHost>(ArrayBuffer&, size_t)> host_resize_array_buffer;
Function<void(StringView)> host_unrecognized_date_string;
Function<ThrowCompletionOr<NonnullGCPtr<ShadowRealm>>(Realm&, NonnullOwnPtr<ExecutionContext>, ShadowRealm&)> host_initialize_shadow_realm;
Vector<StackTraceElement> stack_trace() const;