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LibJS: Add Object.defineProperty() and start caring about attributes

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We now care (a little bit) about the "configurable" and "writable"
property attributes.

Property attributes are stored together with the property name in
the Shape object. Forward transitions are not attribute-savvy and will
cause poor Shape reuse in the case of multiple same-name properties
with different attributes.

Oh, and this patch also adds Object.getOwnPropertyDescriptor() :^)
This commit is contained in:
Andreas Kling 2020-04-09 22:15:26 +02:00
parent 1570e67881
commit e6d920d87d
7 changed files with 121 additions and 16 deletions
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12
Libraries/LibJS/Runtime/Shape.h
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@ -35,6 +35,14 @@
namespace JS {
struct Attribute {
enum {
Configurable = 1 << 0,
Enumerable = 1 << 1,
Writable = 1 << 2,
};
};
struct PropertyMetadata {
size_t offset { 0 };
u8 attributes { 0 };
@ -45,7 +53,7 @@ public:
virtual ~Shape() override;
Shape();
Shape(Shape* previous_shape, const FlyString& property_name, u8 property_attributes);
Shape(Shape* previous_shape, const FlyString& property_name, u8 attributes);
Shape(Shape* previous_shape, Object* new_prototype);
Shape* create_put_transition(const FlyString& name, u8 attributes);
@ -71,7 +79,7 @@ private:
HashMap<FlyString, Shape*> m_forward_transitions;
Shape* m_previous { nullptr };
FlyString m_property_name;
u8 m_property_attributes { 0 };
u8 m_attributes { 0 };
Object* m_prototype { nullptr };
};