LibJS: Use a premade shape for NativeFunction with length and name

~2% of the Speedometer 2.1 profile was just repeatedly performing the shape transitions to add these two properties. We can avoid all that work by caching a premade shape.
Author: https://github.com/awesomekling Commit: 4e9bc0a437 Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4289 Reviewed-by: https://github.com/Hendiadyoin1
2025-08-13 11:39:43 +00:00 · 2025-04-08 22:23:28 +02:00 · 2025-04-08 22:23:28 +02:00 · 4e9bc0a437 · 2025-04-09 05:23:00 +00:00
commit 4e9bc0a437
parent dbf6f7944e
5 changed files with 38 additions and 8 deletions
--- a/Libraries/LibJS/Runtime/FunctionObject.h
+++ b/Libraries/LibJS/Runtime/FunctionObject.h
@ -46,6 +46,8 @@ protected:
    explicit FunctionObject(Realm&, Object* prototype, MayInterfereWithIndexedPropertyAccess = MayInterfereWithIndexedPropertyAccess::No);
    explicit FunctionObject(Object& prototype, MayInterfereWithIndexedPropertyAccess = MayInterfereWithIndexedPropertyAccess::No);

+    [[nodiscard]] GC::Ref<PrimitiveString> make_function_name(Variant<PropertyKey, PrivateName> const&, Optional<StringView> const& prefix);
+
 private:
    virtual bool is_function() const override { return true; }
 };