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LibJS: Key shape transitions on both property name and attributes

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This allows us to cache forward transitions that reconfigure existing
properties as well, leading to better shape reuse.
This commit is contained in:
Andreas Kling
2020-04-10 16:33:44 +02:00
parent 8cbb8491cb
commit 0fea525373
2 changed files with 30 additions and 11 deletions
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20
Libraries/LibJS/Runtime/Shape.cpp
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@@ -31,21 +31,21 @@ namespace JS {
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_attributes == attributes)
return new_shape;
new_shape = heap().allocate<Shape>(this, property_name, attributes, TransitionType::Put);
m_forward_transitions.set(property_name, new_shape);
TransitionKey key { property_name, attributes };
if (auto* existing_shape = m_forward_transitions.get(key).value_or(nullptr))
return existing_shape;
auto* new_shape = heap().allocate<Shape>(this, property_name, attributes, TransitionType::Put);
m_forward_transitions.set(key, new_shape);
return new_shape;
}
Shape* Shape::create_configure_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_attributes == attributes)
return new_shape;
new_shape = heap().allocate<Shape>(this, property_name, attributes, TransitionType::Configure);
m_forward_transitions.set(property_name, new_shape);
TransitionKey key { property_name, attributes };
if (auto* existing_shape = m_forward_transitions.get(key).value_or(nullptr))
return existing_shape;
auto* new_shape = heap().allocate<Shape>(this, property_name, attributes, TransitionType::Configure);
m_forward_transitions.set(key, new_shape);
return new_shape;
}