LibJS: Remove Object::value_of()

Being really close to Object.prototype.valueOf() name wise makes this
unnecessarily confusing - while it sometimes serves as the
implementation of a valueOf() function, it's an abstraction which the
spec doesn't have.
Use the appropriate getters to retrieve specific internal slots instead,
most commonly [[FooData]] from the primitive wrapper objects.
For the Object class specifically, use the Value(Object*) ctor instead.

Userland/Libraries/LibJS/AST.cpp

@@ -364,7 +364,7 @@ Value SuperCall::execute(Interpreter& interpreter, GlobalObject& global_object)
         return {};
 
     // 5. If IsConstructor(func) is false, throw a TypeError exception.
-    if (!func || !func->value_of().is_constructor()) {
+    if (!func || !Value(func).is_constructor()) {
         vm.throw_exception<TypeError>(global_object, ErrorType::NotAConstructor, "Super constructor");
         return {};
     }

Userland/Libraries/LibJS/Runtime/BigIntObject.h

@@ -23,11 +23,6 @@ public:
     BigInt const& bigint() const { return m_bigint; }
     BigInt& bigint() { return m_bigint; }
 
-    virtual Value value_of() const override
-    {
-        return Value(&m_bigint);
-    }
-
 private:
     virtual void visit_edges(Visitor&) override;
 

Userland/Libraries/LibJS/Runtime/BooleanObject.h

@@ -18,10 +18,7 @@ public:
     BooleanObject(bool, Object& prototype);
     virtual ~BooleanObject() override;
 
-    virtual Value value_of() const override
-    {
-        return Value(m_value);
-    }
+    bool boolean() const { return m_value; }
 
 private:
     bool m_value { false };

Userland/Libraries/LibJS/Runtime/BooleanPrototype.cpp

@@ -39,7 +39,7 @@ JS_DEFINE_NATIVE_FUNCTION(BooleanPrototype::to_string)
     if (!this_value.is_object() || !is<BooleanObject>(this_value.as_object()))
         return vm.throw_completion<TypeError>(global_object, ErrorType::NotAnObjectOfType, "Boolean");
 
-    bool bool_value = static_cast<const BooleanObject&>(this_value.as_object()).value_of().as_bool();
+    bool bool_value = static_cast<const BooleanObject&>(this_value.as_object()).boolean();
     return js_string(vm, bool_value ? "true" : "false");
 }
 
@@ -52,6 +52,6 @@ JS_DEFINE_NATIVE_FUNCTION(BooleanPrototype::value_of)
     if (!this_value.is_object() || !is<BooleanObject>(this_value.as_object()))
         return vm.throw_completion<TypeError>(global_object, ErrorType::NotAnObjectOfType, "Boolean");
 
-    return static_cast<const BooleanObject&>(this_value.as_object()).value_of();
+    return Value(static_cast<const BooleanObject&>(this_value.as_object()).boolean());
 }
 }

Userland/Libraries/LibJS/Runtime/Date.h

@@ -73,9 +73,13 @@ public:
     String locale_string() const { return m_datetime.to_string(); }
     String locale_time_string() const { return m_datetime.to_string("%H:%M:%S"); }
 
-    virtual Value value_of() const override
+    // https://tc39.es/ecma262/#sec-properties-of-date-instances
+    // [[DateValue]]
+    double date_value() const
     {
-        return Value(static_cast<double>(m_datetime.timestamp() * 1000 + m_milliseconds));
+        return m_is_invalid
+            ? NAN
+            : static_cast<double>(m_datetime.timestamp() * 1000 + m_milliseconds);
     }
 
 private:

Userland/Libraries/LibJS/Runtime/DatePrototype.cpp

@@ -689,7 +689,7 @@ JS_DEFINE_NATIVE_FUNCTION(DatePrototype::to_locale_date_string)
 
     // 1. Let x be ? thisTimeValue(this value).
     auto* this_object = TRY(typed_this_object(global_object));
-    auto time = this_object->is_invalid() ? js_nan() : this_object->value_of();
+    auto time = Value(this_object->date_value());
 
     // 2. If x is NaN, return "Invalid Date".
     if (time.is_nan())
@@ -714,7 +714,7 @@ JS_DEFINE_NATIVE_FUNCTION(DatePrototype::to_locale_string)
 
     // 1. Let x be ? thisTimeValue(this value).
     auto* this_object = TRY(typed_this_object(global_object));
-    auto time = this_object->is_invalid() ? js_nan() : this_object->value_of();
+    auto time = Value(this_object->date_value());
 
     // 2. If x is NaN, return "Invalid Date".
     if (time.is_nan())
@@ -739,7 +739,7 @@ JS_DEFINE_NATIVE_FUNCTION(DatePrototype::to_locale_time_string)
 
     // 1. Let x be ? thisTimeValue(this value).
     auto* this_object = TRY(typed_this_object(global_object));
-    auto time = this_object->is_invalid() ? js_nan() : this_object->value_of();
+    auto time = Value(this_object->date_value());
 
     // 2. If x is NaN, return "Invalid Date".
     if (time.is_nan())
@@ -798,7 +798,7 @@ JS_DEFINE_NATIVE_FUNCTION(DatePrototype::to_temporal_instant)
 {
     // 1. Let t be ? thisTimeValue(this value).
     auto* this_object = TRY(typed_this_object(global_object));
-    auto t = this_object->value_of();
+    auto t = Value(this_object->date_value());
 
     // 2. Let ns be ? NumberToBigInt(t) × 10^6.
     auto* ns = TRY(number_to_bigint(global_object, t));

Userland/Libraries/LibJS/Runtime/JSONObject.cpp

@@ -145,9 +145,9 @@ ThrowCompletionOr<String> JSONObject::serialize_json_property(GlobalObject& glob
         else if (is<StringObject>(value_object))
             value = TRY(value.to_primitive_string(global_object));
         else if (is<BooleanObject>(value_object))
-            value = static_cast<BooleanObject&>(value_object).value_of();
+            value = Value(static_cast<BooleanObject&>(value_object).boolean());
         else if (is<BigIntObject>(value_object))
-            value = static_cast<BigIntObject&>(value_object).value_of();
+            value = Value(&static_cast<BigIntObject&>(value_object).bigint());
     }
 
     if (value.is_null())

Userland/Libraries/LibJS/Runtime/NumberObject.h

@@ -19,8 +19,6 @@ public:
     NumberObject(double, Object& prototype);
     virtual ~NumberObject() override;
 
-    virtual Value value_of() const override { return Value(m_value); }
-
     double number() const { return m_value; }
 
 private:

Userland/Libraries/LibJS/Runtime/NumberPrototype.cpp

@@ -55,7 +55,7 @@ static ThrowCompletionOr<Value> this_number_value(GlobalObject& global_object, V
     if (value.is_number())
         return value;
     if (value.is_object() && is<NumberObject>(value.as_object()))
-        return static_cast<NumberObject&>(value.as_object()).value_of();
+        return Value(static_cast<NumberObject&>(value.as_object()).number());
     auto& vm = global_object.vm();
     return vm.throw_completion<TypeError>(global_object, ErrorType::NotAnObjectOfType, "Number");
 }

Userland/Libraries/LibJS/Runtime/Object.h

@@ -167,7 +167,6 @@ public:
 
     virtual const char* class_name() const override { return "Object"; }
     virtual void visit_edges(Cell::Visitor&) override;
-    virtual Value value_of() const { return Value(const_cast<Object*>(this)); }
 
     Value get_direct(size_t index) const { return m_storage[index]; }
 

Userland/Libraries/LibJS/Runtime/StringObject.h

@@ -23,11 +23,6 @@ public:
     PrimitiveString const& primitive_string() const { return m_string; }
     PrimitiveString& primitive_string() { return m_string; }
 
-    virtual Value value_of() const override
-    {
-        return Value(&m_string);
-    }
-
 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;

Userland/Libraries/LibJS/Runtime/SymbolObject.h

@@ -26,11 +26,6 @@ public:
     String description() const { return m_symbol.description(); }
     bool is_global() const { return m_symbol.is_global(); }
 
-    virtual Value value_of() const override
-    {
-        return Value(&m_symbol);
-    }
-
 private:
     virtual void visit_edges(Visitor&) override;
 

Userland/Libraries/LibWeb/Bindings/WindowObject.cpp

@@ -166,9 +166,8 @@ static JS::ThrowCompletionOr<DOM::Window*> impl_from(JS::VM& vm, JS::GlobalObjec
     // the global object we make an exception here.
     // This allows calls like `setTimeout(f, 10)` to work.
     auto this_value = vm.this_value(global_object);
-    if (this_value.is_nullish()) {
-        this_value = global_object.value_of();
-    }
+    if (this_value.is_nullish())
+        this_value = &global_object;
 
     auto* this_object = MUST(this_value.to_object(global_object));
 

Userland/Utilities/js.cpp

@@ -760,7 +760,7 @@ static void print_primitive_wrapper_object(FlyString const& name, JS::Object con
     // BooleanObject, NumberObject, StringObject
     print_type(name);
     js_out(" ");
-    print_value(object.value_of(), seen_objects);
+    print_value(&object, seen_objects);
 }
 
 static void print_value(JS::Value value, HashTable<JS::Object*>& seen_objects)