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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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2
Libraries/LibJS/Runtime/ObjectConstructor.h
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@ -42,6 +42,8 @@ private:
virtual bool has_constructor() const override { return true; }
virtual const char* class_name() const override { return "ObjectConstructor"; }
static Value define_property(Interpreter&);
static Value get_own_property_descriptor(Interpreter&);
static Value get_own_property_names(Interpreter&);
static Value get_prototype_of(Interpreter&);
static Value set_prototype_of(Interpreter&);