LibJS: Add a number-indexed property storage to all Objects

Objects can have both named and indexed properties. Previously we kept
all property names as strings. This patch separates named and indexed
properties and splits them between Object::m_storage and m_elements.

This allows us to do much faster array-style access using numeric
indices. It also makes the Array class much less special, since all
Objects now have number-indexed storage. :^)

1 files changed, 7 insertions, 0 deletions

diff --git a/Libraries/LibJS/Runtime/Object.h b/Libraries/LibJS/Runtime/Object.h
index f47b35ac72..529fdb92cc 100644
--- a/Libraries/LibJS/Runtime/Object.h
+++ b/Libraries/LibJS/Runtime/Object.h
@@ -43,7 +43,10 @@ public:
     Shape& shape() { return *m_shape; }
     const Shape& shape() const { return *m_shape; }
 
+    Optional<Value> get_by_index(i32 property_index) const;
     Optional<Value> get(const FlyString& property_name) const;
+
+    void put_by_index(i32 property_index, Value);
     void put(const FlyString& property_name, Value);
 
     virtual Optional<Value> get_own_property(const Object& this_object, const FlyString& property_name) const;
@@ -81,11 +84,15 @@ public:
 
     Value get_direct(size_t index) const { return m_storage[index]; }
 
+    const Vector<Value>& elements() const { return m_elements; }
+    Vector<Value>& elements() { return m_elements; }
+
 private:
     void set_shape(Shape&);
 
     Shape* m_shape { nullptr };
     Vector<Value> m_storage;
+    Vector<Value> m_elements;
 };
 
 }