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LibJS: Implement basic support for the "delete" operator
It turns out "delete" is actually a unary op :) This patch implements deletion of object properties, it doesn't yet work for casually deleting properties from the global object. When deleting a property from an object, we switch that object to having a unique shape, no longer sharing shapes with others. Once an object has a unique shape, it no longer needs to care about shape transitions.
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9 changed files with 190 additions and 8 deletions
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@ -78,6 +78,9 @@ public:
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Shape* create_configure_transition(const FlyString& name, u8 attributes);
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Shape* create_prototype_transition(Object* new_prototype);
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bool is_unique() const { return m_unique; }
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Shape* create_unique_clone() const;
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Object* prototype() { return m_prototype; }
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const Object* prototype() const { return m_prototype; }
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@ -87,6 +90,10 @@ public:
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void set_prototype_without_transition(Object* new_prototype) { m_prototype = new_prototype; }
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void remove_property_from_unique_shape(const FlyString&, size_t offset);
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void add_property_to_unique_shape(const FlyString&, u8 attributes);
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void reconfigure_property_in_unique_shape(const FlyString& property_name, u8 attributes);
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private:
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virtual const char* class_name() const override { return "Shape"; }
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virtual void visit_children(Visitor&) override;
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@ -99,6 +106,7 @@ private:
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Shape* m_previous { nullptr };
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FlyString m_property_name;
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u8 m_attributes { 0 };
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bool m_unique { false };
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Object* m_prototype { nullptr };
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TransitionType m_transition_type { TransitionType::Invalid };
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};
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