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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.cpp
View file

@ -29,12 +29,12 @@
namespace JS {
Shape* Shape::create_put_transition(const FlyString& property_name, u8 property_attributes)
Shape* Shape::create_put_transition(const FlyString& property_name, u8 attributes)
{
auto* new_shape = m_forward_transitions.get(property_name).value_or(nullptr);
if (new_shape && new_shape->m_property_attributes == property_attributes)
if (new_shape && new_shape->m_attributes == attributes)
return new_shape;
new_shape = heap().allocate<Shape>(this, property_name, property_attributes);
new_shape = heap().allocate<Shape>(this, property_name, attributes);
m_forward_transitions.set(property_name, new_shape);
return new_shape;
}
@ -48,10 +48,10 @@ Shape::Shape()
{
}
Shape::Shape(Shape* previous_shape, const FlyString& property_name, u8 property_attributes)
Shape::Shape(Shape* previous_shape, const FlyString& property_name, u8 attributes)
: m_previous(previous_shape)
, m_property_name(property_name)
, m_property_attributes(property_attributes)
, m_attributes(attributes)
, m_prototype(previous_shape->m_prototype)
{
}
@ -114,7 +114,7 @@ void Shape::ensure_property_table() const
// Ignore prototype transitions as they don't affect the key map.
continue;
}
m_property_table->set(shape->m_property_name, { next_offset++, shape->m_property_attributes });
m_property_table->set(shape->m_property_name, { next_offset++, shape->m_attributes });
}
}