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LibJS: Use a premade shape for NativeFunction with length and name
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Browse source 
~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.
This commit is contained in:
Andreas Kling 2025-04-08 22:23:28 +02:00 • committed by Andreas Kling
commit 4e9bc0a437
Notes: github-actions[bot] 2025-04-09 05:23:00 +00:00
5 changed files with 38 additions and 8 deletions
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22
Libraries/LibJS/Runtime/FunctionObject.cpp
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@ -24,14 +24,10 @@ FunctionObject::FunctionObject(Object& prototype, MayInterfereWithIndexedPropert
}
// 10.2.9 SetFunctionName ( F, name [ , prefix ] ), https://tc39.es/ecma262/#sec-setfunctionname
void FunctionObject::set_function_name(Variant<PropertyKey, PrivateName> const& name_arg, Optional<StringView> const& prefix)
GC::Ref<PrimitiveString> FunctionObject::make_function_name(Variant<PropertyKey, PrivateName> const& name_arg, Optional<StringView> const& prefix)
{
auto& vm = this->vm();
// 1. Assert: F is an extensible object that does not have a "name" own property.
VERIFY(m_is_extensible);
VERIFY(!storage_has(vm.names.name));
String name;
// 2. If Type(name) is Symbol, then
@ -74,8 +70,22 @@ void FunctionObject::set_function_name(Variant<PropertyKey, PrivateName> const&
}
}
return PrimitiveString::create(vm, move(name));
}
// 10.2.9 SetFunctionName ( F, name [ , prefix ] ), https://tc39.es/ecma262/#sec-setfunctionname
void FunctionObject::set_function_name(Variant<PropertyKey, PrivateName> const& name_arg, Optional<StringView> const& prefix)
{
auto& vm = this->vm();
// 1. Assert: F is an extensible object that does not have a "name" own property.
VERIFY(m_is_extensible);
VERIFY(!storage_has(vm.names.name));
auto name = make_function_name(name_arg, prefix);
// 6. Perform ! DefinePropertyOrThrow(F, "name", PropertyDescriptor { [[Value]]: name, [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: true }).
MUST(define_property_or_throw(vm.names.name, PropertyDescriptor { .value = PrimitiveString::create(vm, move(name)), .writable = false, .enumerable = false, .configurable = true }));
MUST(define_property_or_throw(vm.names.name, PropertyDescriptor { .value = name, .writable = false, .enumerable = false, .configurable = true }));
// 7. Return unused.
}