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LibJS+LibWeb: Restore type safety of Realm::set_global_object()

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The changes from 8a03b17 to allow any JS::Value aren't a good fit, as
shown by the excessive amount of verify_cast needed :^)
This commit is contained in:
Linus Groh 2022-08-06 01:01:13 +01:00 • committed by Andreas Kling
parent 64b29eb459
commit c8f1651761
10 changed files with 27 additions and 36 deletions
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27
Userland/Libraries/LibJS/Runtime/Realm.cpp
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@ -21,7 +21,7 @@ Realm* Realm::create(VM& vm)
}
// 9.6 InitializeHostDefinedRealm ( ), https://tc39.es/ecma262/#sec-initializehostdefinedrealm
ThrowCompletionOr<NonnullOwnPtr<ExecutionContext>> Realm::initialize_host_defined_realm(VM& vm, Function<Value(Realm&)> create_global_object, Function<Value(Realm&)> create_global_this_value)
ThrowCompletionOr<NonnullOwnPtr<ExecutionContext>> Realm::initialize_host_defined_realm(VM& vm, Function<GlobalObject*(Realm&)> create_global_object, Function<GlobalObject*(Realm&)> create_global_this_value)
{
DeferGC defer_gc(vm.heap());
@ -46,20 +46,16 @@ ThrowCompletionOr<NonnullOwnPtr<ExecutionContext>> Realm::initialize_host_define
// 7. If the host requires use of an exotic object to serve as realm's global object,
// let global be such an object created in a host-defined manner.
// Otherwise, let global be undefined, indicating that an ordinary object should be created as the global object.
Value global;
GlobalObject* global = nullptr;
if (create_global_object)
global = create_global_object(*realm);
else
global = js_undefined();
// 8. If the host requires that the this binding in realm's global scope return an object other than the global object,
// let thisValue be such an object created in a host-defined manner.
// Otherwise, let thisValue be undefined, indicating that realm's global this binding should be the global object.
Value this_value;
GlobalObject* this_value = nullptr;
if (create_global_this_value)
this_value = create_global_this_value(*realm);
else
this_value = js_undefined();
// 9. Perform SetRealmGlobalObject(realm, global, thisValue).
realm->set_global_object(global, this_value);
@ -75,34 +71,33 @@ ThrowCompletionOr<NonnullOwnPtr<ExecutionContext>> Realm::initialize_host_define
}
// 9.3.3 SetRealmGlobalObject ( realmRec, globalObj, thisValue ), https://tc39.es/ecma262/#sec-setrealmglobalobject
void Realm::set_global_object(Value global_object, Value this_value)
void Realm::set_global_object(GlobalObject* global_object, GlobalObject* this_value)
{
// 1. If globalObj is undefined, then
if (global_object.is_undefined()) {
if (global_object == nullptr) {
// NOTE: Step 1 is not supported, the global object must be allocated elsewhere.
VERIFY_NOT_REACHED();
}
// 2. Assert: Type(globalObj) is Object.
VERIFY(global_object.is_object());
VERIFY(is<GlobalObject>(global_object.as_object()));
VERIFY(global_object);
// Non-standard
verify_cast<GlobalObject>(global_object.as_object()).set_associated_realm(*this);
global_object->set_associated_realm(*this);
// 3. If thisValue is undefined, set thisValue to globalObj.
if (this_value.is_undefined())
if (this_value == nullptr)
this_value = global_object;
// Non-standard
VERIFY(this_value.is_object());
VERIFY(this_value);
// 4. Set realmRec.[[GlobalObject]] to globalObj.
m_global_object = &verify_cast<GlobalObject>(global_object.as_object());
m_global_object = global_object;
// 5. Let newGlobalEnv be NewGlobalEnvironment(globalObj, thisValue).
// 6. Set realmRec.[[GlobalEnv]] to newGlobalEnv.
m_global_environment = m_global_object->heap().allocate_without_global_object<GlobalEnvironment>(verify_cast<GlobalObject>(global_object.as_object()), this_value.as_object());
m_global_environment = m_global_object->heap().allocate_without_global_object<GlobalEnvironment>(*global_object, *this_value);
// 7. Return unused.
}