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LibJS: Use a premade shape for NativeFunction with length and name
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~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.
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Notes:
github-actions[bot]
2025-04-09 05:23:00 +00:00
Author: https://github.com/awesomekling
Commit: 4e9bc0a437
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4289
Reviewed-by: https://github.com/Hendiadyoin1
5 changed files with 38 additions and 8 deletions
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@ -24,14 +24,10 @@ FunctionObject::FunctionObject(Object& prototype, MayInterfereWithIndexedPropert
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}
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// 10.2.9 SetFunctionName ( F, name [ , prefix ] ), https://tc39.es/ecma262/#sec-setfunctionname
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void FunctionObject::set_function_name(Variant<PropertyKey, PrivateName> const& name_arg, Optional<StringView> const& prefix)
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GC::Ref<PrimitiveString> FunctionObject::make_function_name(Variant<PropertyKey, PrivateName> const& name_arg, Optional<StringView> const& prefix)
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{
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auto& vm = this->vm();
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// 1. Assert: F is an extensible object that does not have a "name" own property.
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VERIFY(m_is_extensible);
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VERIFY(!storage_has(vm.names.name));
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String name;
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// 2. If Type(name) is Symbol, then
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@ -74,8 +70,22 @@ void FunctionObject::set_function_name(Variant<PropertyKey, PrivateName> const&
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}
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}
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return PrimitiveString::create(vm, move(name));
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}
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// 10.2.9 SetFunctionName ( F, name [ , prefix ] ), https://tc39.es/ecma262/#sec-setfunctionname
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void FunctionObject::set_function_name(Variant<PropertyKey, PrivateName> const& name_arg, Optional<StringView> const& prefix)
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{
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auto& vm = this->vm();
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// 1. Assert: F is an extensible object that does not have a "name" own property.
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VERIFY(m_is_extensible);
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VERIFY(!storage_has(vm.names.name));
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auto name = make_function_name(name_arg, prefix);
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// 6. Perform ! DefinePropertyOrThrow(F, "name", PropertyDescriptor { [[Value]]: name, [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: true }).
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MUST(define_property_or_throw(vm.names.name, PropertyDescriptor { .value = PrimitiveString::create(vm, move(name)), .writable = false, .enumerable = false, .configurable = true }));
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MUST(define_property_or_throw(vm.names.name, PropertyDescriptor { .value = name, .writable = false, .enumerable = false, .configurable = true }));
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// 7. Return unused.
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}
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