LibJS+LibWeb: Prevent double invocation of `[[GetOwnProperty]]`

The `[[GetOwnProperty]]` internal method invocation in
`OrdinarySetWithOwnDescriptor` was being invocated again with the same
parameters in the `[[DefineOwnProperty]]` internal method that is also
later called in `OrdinarySetWithOwnDescriptor`.

The `PlatformObject.[[DefineOwnProperty]]` has similair logic.

This change adds an optional parameter to the `[[DefineOwnProperty]]`
internal method so the results of the previous `[[GetOwnProperty]]`
internal method invocation can be re-used.

Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp

@@ -3011,7 +3011,7 @@ public:
     JS::Realm& realm() const { return m_realm; }
 private:
     virtual JS::ThrowCompletionOr<Optional<JS::PropertyDescriptor>> internal_get_own_property(JS::PropertyKey const&) const override;
-    virtual JS::ThrowCompletionOr<bool> internal_define_own_property(JS::PropertyKey const&, JS::PropertyDescriptor const&) override;
+    virtual JS::ThrowCompletionOr<bool> internal_define_own_property(JS::PropertyKey const&, JS::PropertyDescriptor const&, Optional<JS::PropertyDescriptor>* precomputed_get_own_property = nullptr) override;
     virtual JS::ThrowCompletionOr<bool> internal_delete(JS::PropertyKey const&) override;
     virtual JS::ThrowCompletionOr<bool> internal_set_prototype_of(JS::Object* prototype) override;
     virtual JS::ThrowCompletionOr<bool> internal_prevent_extensions() override;
@@ -3129,7 +3129,7 @@ JS::ThrowCompletionOr<Optional<JS::PropertyDescriptor>> @named_properties_class@
 }
 
 // https://webidl.spec.whatwg.org/#named-properties-object-defineownproperty
-JS::ThrowCompletionOr<bool> @named_properties_class@::internal_define_own_property(JS::PropertyKey const&, JS::PropertyDescriptor const&)
+JS::ThrowCompletionOr<bool> @named_properties_class@::internal_define_own_property(JS::PropertyKey const&, JS::PropertyDescriptor const&, Optional<JS::PropertyDescriptor>*)
 {
     // 1. Return false.
     return false;

Userland/Libraries/LibJS/Runtime/ArgumentsObject.cpp

@@ -127,7 +127,7 @@ ThrowCompletionOr<Optional<PropertyDescriptor>> ArgumentsObject::internal_get_ow
 }
 
 // 10.4.4.2 [[DefineOwnProperty]] ( P, Desc ), https://tc39.es/ecma262/#sec-arguments-exotic-objects-defineownproperty-p-desc
-ThrowCompletionOr<bool> ArgumentsObject::internal_define_own_property(PropertyKey const& property_key, PropertyDescriptor const& descriptor)
+ThrowCompletionOr<bool> ArgumentsObject::internal_define_own_property(PropertyKey const& property_key, PropertyDescriptor const& descriptor, Optional<PropertyDescriptor>* precomputed_get_own_property)
 {
     // 1. Let map be args.[[ParameterMap]].
     auto& map = parameter_map();
@@ -150,7 +150,7 @@ ThrowCompletionOr<bool> ArgumentsObject::internal_define_own_property(PropertyKe
     }
 
     // 5. Let allowed be ! OrdinaryDefineOwnProperty(args, P, newArgDesc).
-    bool allowed = MUST(Object::internal_define_own_property(property_key, new_arg_desc));
+    bool allowed = MUST(Object::internal_define_own_property(property_key, new_arg_desc, precomputed_get_own_property));
 
     // 6. If allowed is false, return false.
     if (!allowed)

Userland/Libraries/LibJS/Runtime/ArgumentsObject.h

@@ -23,7 +23,7 @@ public:
     Environment& environment() { return m_environment; }
 
     virtual ThrowCompletionOr<Optional<PropertyDescriptor>> internal_get_own_property(PropertyKey const&) const override;
-    virtual ThrowCompletionOr<bool> internal_define_own_property(PropertyKey const&, PropertyDescriptor const&) override;
+    virtual ThrowCompletionOr<bool> internal_define_own_property(PropertyKey const&, PropertyDescriptor const&, Optional<PropertyDescriptor>* precomputed_get_own_property = nullptr) override;
     virtual ThrowCompletionOr<Value> internal_get(PropertyKey const&, Value receiver, CacheablePropertyMetadata*, PropertyLookupPhase) const override;
     virtual ThrowCompletionOr<bool> internal_set(PropertyKey const&, Value value, Value receiver, CacheablePropertyMetadata*) override;
     virtual ThrowCompletionOr<bool> internal_delete(PropertyKey const&) override;

Userland/Libraries/LibJS/Runtime/Array.cpp

@@ -277,7 +277,7 @@ ThrowCompletionOr<Optional<PropertyDescriptor>> Array::internal_get_own_property
 }
 
 // 10.4.2.1 [[DefineOwnProperty]] ( P, Desc ), https://tc39.es/ecma262/#sec-array-exotic-objects-defineownproperty-p-desc
-ThrowCompletionOr<bool> Array::internal_define_own_property(PropertyKey const& property_key, PropertyDescriptor const& property_descriptor)
+ThrowCompletionOr<bool> Array::internal_define_own_property(PropertyKey const& property_key, PropertyDescriptor const& property_descriptor, Optional<PropertyDescriptor>* precomputed_get_own_property)
 {
     auto& vm = this->vm();
 
@@ -303,7 +303,7 @@ ThrowCompletionOr<bool> Array::internal_define_own_property(PropertyKey const& p
             return false;
 
         // h. Let succeeded be ! OrdinaryDefineOwnProperty(A, P, Desc).
-        auto succeeded = MUST(Object::internal_define_own_property(property_key, property_descriptor));
+        auto succeeded = MUST(Object::internal_define_own_property(property_key, property_descriptor, precomputed_get_own_property));
 
         // i. If succeeded is false, return false.
         if (!succeeded)
@@ -319,7 +319,7 @@ ThrowCompletionOr<bool> Array::internal_define_own_property(PropertyKey const& p
     }
 
     // 3. Return ? OrdinaryDefineOwnProperty(A, P, Desc).
-    return Object::internal_define_own_property(property_key, property_descriptor);
+    return Object::internal_define_own_property(property_key, property_descriptor, precomputed_get_own_property);
 }
 
 // NON-STANDARD: Used to reject deletes to ephemeral (non-configurable) length property

Userland/Libraries/LibJS/Runtime/Array.h

@@ -48,7 +48,7 @@ public:
     virtual ~Array() override = default;
 
     virtual ThrowCompletionOr<Optional<PropertyDescriptor>> internal_get_own_property(PropertyKey const&) const override final;
-    virtual ThrowCompletionOr<bool> internal_define_own_property(PropertyKey const&, PropertyDescriptor const&) override final;
+    virtual ThrowCompletionOr<bool> internal_define_own_property(PropertyKey const&, PropertyDescriptor const&, Optional<PropertyDescriptor>* precomputed_get_own_property = nullptr) override final;
     virtual ThrowCompletionOr<bool> internal_delete(PropertyKey const&) override;
     virtual ThrowCompletionOr<MarkedVector<Value>> internal_own_property_keys() const override final;
 

Userland/Libraries/LibJS/Runtime/ModuleNamespaceObject.cpp

@@ -82,11 +82,11 @@ ThrowCompletionOr<Optional<PropertyDescriptor>> ModuleNamespaceObject::internal_
 }
 
 // 10.4.6.6 [[DefineOwnProperty]] ( P, Desc ), https://tc39.es/ecma262/#sec-module-namespace-exotic-objects-defineownproperty-p-desc
-ThrowCompletionOr<bool> ModuleNamespaceObject::internal_define_own_property(PropertyKey const& property_key, PropertyDescriptor const& descriptor)
+ThrowCompletionOr<bool> ModuleNamespaceObject::internal_define_own_property(PropertyKey const& property_key, PropertyDescriptor const& descriptor, Optional<PropertyDescriptor>* precomputed_get_own_property)
 {
     // 1. If Type(P) is Symbol, return ! OrdinaryDefineOwnProperty(O, P, Desc).
     if (property_key.is_symbol())
-        return MUST(Object::internal_define_own_property(property_key, descriptor));
+        return MUST(Object::internal_define_own_property(property_key, descriptor, precomputed_get_own_property));
 
     // 2. Let current be ? O.[[GetOwnProperty]](P).
     auto current = TRY(internal_get_own_property(property_key));

Userland/Libraries/LibJS/Runtime/ModuleNamespaceObject.h

@@ -24,7 +24,7 @@ public:
     virtual ThrowCompletionOr<bool> internal_is_extensible() const override;
     virtual ThrowCompletionOr<bool> internal_prevent_extensions() override;
     virtual ThrowCompletionOr<Optional<PropertyDescriptor>> internal_get_own_property(PropertyKey const&) const override;
-    virtual ThrowCompletionOr<bool> internal_define_own_property(PropertyKey const&, PropertyDescriptor const&) override;
+    virtual ThrowCompletionOr<bool> internal_define_own_property(PropertyKey const&, PropertyDescriptor const&, Optional<PropertyDescriptor>* precomputed_get_own_property = nullptr) override;
     virtual ThrowCompletionOr<bool> internal_has_property(PropertyKey const&) const override;
     virtual ThrowCompletionOr<Value> internal_get(PropertyKey const&, Value receiver, CacheablePropertyMetadata* = nullptr, PropertyLookupPhase = PropertyLookupPhase::OwnProperty) const override;
     virtual ThrowCompletionOr<bool> internal_set(PropertyKey const&, Value value, Value receiver, CacheablePropertyMetadata*) override;

Userland/Libraries/LibJS/Runtime/Object.cpp

@@ -848,12 +848,12 @@ ThrowCompletionOr<Optional<PropertyDescriptor>> Object::internal_get_own_propert
 }
 
 // 10.1.6 [[DefineOwnProperty]] ( P, Desc ), https://tc39.es/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots-defineownproperty-p-desc
-ThrowCompletionOr<bool> Object::internal_define_own_property(PropertyKey const& property_key, PropertyDescriptor const& property_descriptor)
+ThrowCompletionOr<bool> Object::internal_define_own_property(PropertyKey const& property_key, PropertyDescriptor const& property_descriptor, Optional<PropertyDescriptor>* precomputed_get_own_property)
 {
     VERIFY(property_key.is_valid());
 
     // 1. Let current be ? O.[[GetOwnProperty]](P).
-    auto current = TRY(internal_get_own_property(property_key));
+    auto current = precomputed_get_own_property ? *precomputed_get_own_property : TRY(internal_get_own_property(property_key));
 
     // 2. Let extensible be ? IsExtensible(O).
     auto extensible = TRY(is_extensible());
@@ -1009,8 +1009,10 @@ ThrowCompletionOr<bool> Object::ordinary_set_with_own_descriptor(PropertyKey con
         if (!receiver.is_object())
             return false;
 
+        auto& receiver_object = receiver.as_object();
+
         // c. Let existingDescriptor be ? Receiver.[[GetOwnProperty]](P).
-        auto existing_descriptor = TRY(receiver.as_object().internal_get_own_property(property_key));
+        auto existing_descriptor = TRY(receiver_object.internal_get_own_property(property_key));
 
         // d. If existingDescriptor is not undefined, then
         if (existing_descriptor.has_value()) {
@@ -1034,15 +1036,15 @@ ThrowCompletionOr<bool> Object::ordinary_set_with_own_descriptor(PropertyKey con
             }
 
             // iv. Return ? Receiver.[[DefineOwnProperty]](P, valueDesc).
-            return TRY(receiver.as_object().internal_define_own_property(property_key, value_descriptor));
+            return TRY(receiver_object.internal_define_own_property(property_key, value_descriptor, &existing_descriptor));
         }
         // e. Else,
         else {
             // i. Assert: Receiver does not currently have a property P.
-            VERIFY(!receiver.as_object().storage_has(property_key));
+            VERIFY(!receiver_object.storage_has(property_key));
 
             // ii. Return ? CreateDataProperty(Receiver, P, V).
-            return TRY(receiver.as_object().create_data_property(property_key, value));
+            return TRY(receiver_object.create_data_property(property_key, value));
         }
     }
 

Userland/Libraries/LibJS/Runtime/Object.h

@@ -138,7 +138,7 @@ public:
     virtual ThrowCompletionOr<bool> internal_is_extensible() const;
     virtual ThrowCompletionOr<bool> internal_prevent_extensions();
     virtual ThrowCompletionOr<Optional<PropertyDescriptor>> internal_get_own_property(PropertyKey const&) const;
-    virtual ThrowCompletionOr<bool> internal_define_own_property(PropertyKey const&, PropertyDescriptor const&);
+    virtual ThrowCompletionOr<bool> internal_define_own_property(PropertyKey const&, PropertyDescriptor const&, Optional<PropertyDescriptor>* precomputed_get_own_property = nullptr);
     virtual ThrowCompletionOr<bool> internal_has_property(PropertyKey const&) const;
     enum class PropertyLookupPhase {
         OwnProperty,

Userland/Libraries/LibJS/Runtime/ProxyObject.cpp

@@ -336,7 +336,7 @@ ThrowCompletionOr<Optional<PropertyDescriptor>> ProxyObject::internal_get_own_pr
 }
 
 // 10.5.6 [[DefineOwnProperty]] ( P, Desc ), https://tc39.es/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-defineownproperty-p-desc
-ThrowCompletionOr<bool> ProxyObject::internal_define_own_property(PropertyKey const& property_key, PropertyDescriptor const& property_descriptor)
+ThrowCompletionOr<bool> ProxyObject::internal_define_own_property(PropertyKey const& property_key, PropertyDescriptor const& property_descriptor, Optional<PropertyDescriptor>*)
 {
     LIMIT_PROXY_RECURSION_DEPTH();
 

Userland/Libraries/LibJS/Runtime/ProxyObject.h

@@ -37,7 +37,7 @@ public:
     virtual ThrowCompletionOr<bool> internal_is_extensible() const override;
     virtual ThrowCompletionOr<bool> internal_prevent_extensions() override;
     virtual ThrowCompletionOr<Optional<PropertyDescriptor>> internal_get_own_property(PropertyKey const&) const override;
-    virtual ThrowCompletionOr<bool> internal_define_own_property(PropertyKey const&, PropertyDescriptor const&) override;
+    virtual ThrowCompletionOr<bool> internal_define_own_property(PropertyKey const&, PropertyDescriptor const&, Optional<PropertyDescriptor>* precomputed_get_own_property = nullptr) override;
     virtual ThrowCompletionOr<bool> internal_has_property(PropertyKey const&) const override;
     virtual ThrowCompletionOr<Value> internal_get(PropertyKey const&, Value receiver, CacheablePropertyMetadata*, PropertyLookupPhase) const override;
     virtual ThrowCompletionOr<bool> internal_set(PropertyKey const&, Value value, Value receiver, CacheablePropertyMetadata*) override;

Userland/Libraries/LibJS/Runtime/StringObject.cpp

@@ -113,7 +113,7 @@ ThrowCompletionOr<Optional<PropertyDescriptor>> StringObject::internal_get_own_p
 }
 
 // 10.4.3.2 [[DefineOwnProperty]] ( P, Desc ), https://tc39.es/ecma262/#sec-string-exotic-objects-defineownproperty-p-desc
-ThrowCompletionOr<bool> StringObject::internal_define_own_property(PropertyKey const& property_key, PropertyDescriptor const& property_descriptor)
+ThrowCompletionOr<bool> StringObject::internal_define_own_property(PropertyKey const& property_key, PropertyDescriptor const& property_descriptor, Optional<PropertyDescriptor>* precomputed_get_own_property)
 {
     VERIFY(property_key.is_valid());
 
@@ -130,7 +130,7 @@ ThrowCompletionOr<bool> StringObject::internal_define_own_property(PropertyKey c
     }
 
     // 3. Return ! OrdinaryDefineOwnProperty(S, P, Desc).
-    return Object::internal_define_own_property(property_key, property_descriptor);
+    return Object::internal_define_own_property(property_key, property_descriptor, precomputed_get_own_property);
 }
 
 // 10.4.3.3 [[OwnPropertyKeys]] ( ), https://tc39.es/ecma262/#sec-string-exotic-objects-ownpropertykeys

Userland/Libraries/LibJS/Runtime/StringObject.h

@@ -28,7 +28,7 @@ protected:
 
 private:
     virtual ThrowCompletionOr<Optional<PropertyDescriptor>> internal_get_own_property(PropertyKey const&) const override;
-    virtual ThrowCompletionOr<bool> internal_define_own_property(PropertyKey const&, PropertyDescriptor const&) override;
+    virtual ThrowCompletionOr<bool> internal_define_own_property(PropertyKey const&, PropertyDescriptor const&, Optional<PropertyDescriptor>* precomputed_get_own_property = nullptr) override;
     virtual ThrowCompletionOr<MarkedVector<Value>> internal_own_property_keys() const override;
 
     virtual bool is_string_object() const final { return true; }

Userland/Libraries/LibJS/Runtime/TypedArray.h

@@ -268,7 +268,7 @@ public:
     }
 
     // 10.4.5.3 [[DefineOwnProperty]] ( P, Desc ), https://tc39.es/ecma262/#sec-integer-indexed-exotic-objects-defineownproperty-p-desc
-    virtual ThrowCompletionOr<bool> internal_define_own_property(PropertyKey const& property_key, PropertyDescriptor const& property_descriptor) override
+    virtual ThrowCompletionOr<bool> internal_define_own_property(PropertyKey const& property_key, PropertyDescriptor const& property_descriptor, Optional<PropertyDescriptor>* precomputed_get_own_property = nullptr) override
     {
         VERIFY(property_key.is_valid());
 
@@ -313,7 +313,7 @@ public:
         }
 
         // 2. Return ! OrdinaryDefineOwnProperty(O, P, Desc).
-        return Object::internal_define_own_property(property_key, property_descriptor);
+        return Object::internal_define_own_property(property_key, property_descriptor, precomputed_get_own_property);
     }
 
     // 10.4.5.4 [[Get]] ( P, Receiver ), 10.4.5.4 [[Get]] ( P, Receiver )

Userland/Libraries/LibWeb/Bindings/PlatformObject.cpp

@@ -253,10 +253,12 @@ JS::ThrowCompletionOr<bool> PlatformObject::internal_set(JS::PropertyKey const&
 }
 
 // https://webidl.spec.whatwg.org/#legacy-platform-object-defineownproperty
-JS::ThrowCompletionOr<bool> PlatformObject::internal_define_own_property(JS::PropertyKey const& property_name, JS::PropertyDescriptor const& property_descriptor)
+JS::ThrowCompletionOr<bool> PlatformObject::internal_define_own_property(JS::PropertyKey const& property_name, JS::PropertyDescriptor const& property_descriptor, Optional<JS::PropertyDescriptor>* precomputed_get_own_property)
 {
+    Optional<JS::PropertyDescriptor> get_own_property_result = {};
+
     if (!m_legacy_platform_object_flags.has_value() || m_legacy_platform_object_flags->has_global_interface_extended_attribute)
-        return Base::internal_define_own_property(property_name, property_descriptor);
+        return Base::internal_define_own_property(property_name, property_descriptor, precomputed_get_own_property);
 
     auto& vm = this->vm();
 
@@ -287,7 +289,14 @@ JS::ThrowCompletionOr<bool> PlatformObject::internal_define_own_property(JS::Pro
 
         // 2. If O implements an interface with the [LegacyOverrideBuiltIns] extended attribute or O does not have an own property named P, then:
         // NOTE: Own property lookup has to be done manually instead of using Object::has_own_property, as that would use the overridden internal_get_own_property.
-        if (m_legacy_platform_object_flags->has_legacy_override_built_ins_interface_extended_attribute || !TRY(Object::internal_get_own_property(property_name)).has_value()) {
+        if (!m_legacy_platform_object_flags->has_legacy_override_built_ins_interface_extended_attribute) {
+            // AD-HOC: Avoid computing the [[GetOwnProperty]] multiple times.
+            if (!precomputed_get_own_property) {
+                get_own_property_result = TRY(Object::internal_get_own_property(property_name));
+                precomputed_get_own_property = &get_own_property_result;
+            }
+        }
+        if (m_legacy_platform_object_flags->has_legacy_override_built_ins_interface_extended_attribute || precomputed_get_own_property->has_value()) {
             // 1. If creating is false and O does not implement an interface with a named property setter, then return false.
             if (!creating && !m_legacy_platform_object_flags->has_named_property_setter)
                 return false;
@@ -308,7 +317,7 @@ JS::ThrowCompletionOr<bool> PlatformObject::internal_define_own_property(JS::Pro
     }
 
     // 3. Return ! OrdinaryDefineOwnProperty(O, P, Desc).
-    return Object::internal_define_own_property(property_name, property_descriptor);
+    return Object::internal_define_own_property(property_name, property_descriptor, precomputed_get_own_property);
 }
 
 // https://webidl.spec.whatwg.org/#legacy-platform-object-delete

Userland/Libraries/LibWeb/Bindings/PlatformObject.h

@@ -37,7 +37,7 @@ public:
     // ^JS::Object
     virtual JS::ThrowCompletionOr<Optional<JS::PropertyDescriptor>> internal_get_own_property(JS::PropertyKey const&) const override;
     virtual JS::ThrowCompletionOr<bool> internal_set(JS::PropertyKey const&, JS::Value, JS::Value, JS::CacheablePropertyMetadata* = nullptr) override;
-    virtual JS::ThrowCompletionOr<bool> internal_define_own_property(JS::PropertyKey const&, JS::PropertyDescriptor const&) override;
+    virtual JS::ThrowCompletionOr<bool> internal_define_own_property(JS::PropertyKey const&, JS::PropertyDescriptor const&, Optional<JS::PropertyDescriptor>* precomputed_get_own_property = nullptr) override;
     virtual JS::ThrowCompletionOr<bool> internal_delete(JS::PropertyKey const&) override;
     virtual JS::ThrowCompletionOr<bool> internal_prevent_extensions() override;
     virtual JS::ThrowCompletionOr<JS::MarkedVector<JS::Value>> internal_own_property_keys() const override;

Userland/Libraries/LibWeb/HTML/Location.cpp

@@ -528,13 +528,13 @@ JS::ThrowCompletionOr<Optional<JS::PropertyDescriptor>> Location::internal_get_o
 }
 
 // 7.10.5.6 [[DefineOwnProperty]] ( P, Desc ), https://html.spec.whatwg.org/multipage/history.html#location-defineownproperty
-JS::ThrowCompletionOr<bool> Location::internal_define_own_property(JS::PropertyKey const& property_key, JS::PropertyDescriptor const& descriptor)
+JS::ThrowCompletionOr<bool> Location::internal_define_own_property(JS::PropertyKey const& property_key, JS::PropertyDescriptor const& descriptor, Optional<JS::PropertyDescriptor>* precomputed_get_own_property)
 {
     // 1. If IsPlatformObjectSameOrigin(this) is true, then:
     if (HTML::is_platform_object_same_origin(*this)) {
         // 1. If the value of the [[DefaultProperties]] internal slot of this contains P, then return false.
         // 2. Return ? OrdinaryDefineOwnProperty(this, P, Desc).
-        return JS::Object::internal_define_own_property(property_key, descriptor);
+        return JS::Object::internal_define_own_property(property_key, descriptor, precomputed_get_own_property);
     }
 
     // 2. Throw a "SecurityError" DOMException.

Userland/Libraries/LibWeb/HTML/Location.h

@@ -59,7 +59,7 @@ public:
     virtual JS::ThrowCompletionOr<bool> internal_is_extensible() const override;
     virtual JS::ThrowCompletionOr<bool> internal_prevent_extensions() override;
     virtual JS::ThrowCompletionOr<Optional<JS::PropertyDescriptor>> internal_get_own_property(JS::PropertyKey const&) const override;
-    virtual JS::ThrowCompletionOr<bool> internal_define_own_property(JS::PropertyKey const&, JS::PropertyDescriptor const&) override;
+    virtual JS::ThrowCompletionOr<bool> internal_define_own_property(JS::PropertyKey const&, JS::PropertyDescriptor const&, Optional<JS::PropertyDescriptor>* precomputed_get_own_property = nullptr) override;
     virtual JS::ThrowCompletionOr<JS::Value> internal_get(JS::PropertyKey const&, JS::Value receiver, JS::CacheablePropertyMetadata*, PropertyLookupPhase) const override;
     virtual JS::ThrowCompletionOr<bool> internal_set(JS::PropertyKey const&, JS::Value value, JS::Value receiver, JS::CacheablePropertyMetadata*) override;
     virtual JS::ThrowCompletionOr<bool> internal_delete(JS::PropertyKey const&) override;

Userland/Libraries/LibWeb/HTML/WindowProxy.cpp

@@ -133,7 +133,7 @@ JS::ThrowCompletionOr<Optional<JS::PropertyDescriptor>> WindowProxy::internal_ge
 }
 
 // 7.4.6 [[DefineOwnProperty]] ( P, Desc ), https://html.spec.whatwg.org/multipage/window-object.html#windowproxy-defineownproperty
-JS::ThrowCompletionOr<bool> WindowProxy::internal_define_own_property(JS::PropertyKey const& property_key, JS::PropertyDescriptor const& descriptor)
+JS::ThrowCompletionOr<bool> WindowProxy::internal_define_own_property(JS::PropertyKey const& property_key, JS::PropertyDescriptor const& descriptor, Optional<JS::PropertyDescriptor>*)
 {
     // 1. Let W be the value of the [[Window]] internal slot of this.
 

Userland/Libraries/LibWeb/HTML/WindowProxy.h

@@ -26,7 +26,7 @@ public:
     virtual JS::ThrowCompletionOr<bool> internal_is_extensible() const override;
     virtual JS::ThrowCompletionOr<bool> internal_prevent_extensions() override;
     virtual JS::ThrowCompletionOr<Optional<JS::PropertyDescriptor>> internal_get_own_property(JS::PropertyKey const&) const override;
-    virtual JS::ThrowCompletionOr<bool> internal_define_own_property(JS::PropertyKey const&, JS::PropertyDescriptor const&) override;
+    virtual JS::ThrowCompletionOr<bool> internal_define_own_property(JS::PropertyKey const&, JS::PropertyDescriptor const&, Optional<JS::PropertyDescriptor>* precomputed_get_own_property = nullptr) override;
     virtual JS::ThrowCompletionOr<JS::Value> internal_get(JS::PropertyKey const&, JS::Value receiver, JS::CacheablePropertyMetadata*, PropertyLookupPhase) const override;
     virtual JS::ThrowCompletionOr<bool> internal_set(JS::PropertyKey const&, JS::Value value, JS::Value receiver, JS::CacheablePropertyMetadata*) override;
     virtual JS::ThrowCompletionOr<bool> internal_delete(JS::PropertyKey const&) override;