eliott/ladybird
1
0
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird synced 2026-05-03 04:52:06 +02:00
Code Issues Packages Projects Releases Wiki Activity

LibJS: Lazily instantiate "prototype" field on ECMAScriptFunctionObject

Browse Source 
This field is rarely accessed but we were creating it for every single
script function instantiated.

It's a little awkward but the same optimization can be found in other
engines, so it's nothing crazy.

This avoids creating roughly 80,000 objects on my x.com home feed.
This commit is contained in:
Andreas Kling
2025-12-16 19:20:59 -06:00
committed by Andreas Kling
parent 941336505c
commit cbe75f8251
Notes: github-actions[bot] 2025-12-17 18:51:45 +00:00 
Author: https://github.com/awesomekling
Commit: https://github.com/LadybirdBrowser/ladybird/commit/cbe75f8251f
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/7167
4 changed files with 21 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
Libraries/LibJS/Runtime/ECMAScriptFunctionObject.h
View File

@@ -117,6 +117,8 @@ private:
PrivateEnvironment* private_environment,
Object& prototype);
virtual ThrowCompletionOr<Optional<PropertyDescriptor>> internal_get_own_property(PropertyKey const&) const override;
virtual bool is_strict_mode() const override { return shared_data().m_strict; }
ThrowCompletionOr<Value> ordinary_call_evaluate_body(VM&, ExecutionContext&);
@@ -145,6 +147,8 @@ private:
};
ClassData& ensure_class_data() const;
mutable OwnPtr<ClassData> m_class_data;
mutable bool m_may_need_lazy_prototype_instantiation { false };
};
template<>