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LibJS: Add fast path for magical "length" property in LengthOfArrayLike

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For Array objects, we can avoid a generic Get here since we know it has
magical "length" behavior anyway.
This commit is contained in:
Andreas Kling 2023-12-08 12:34:42 +01:00
commit 73ceb475b9
Notes: sideshowbarker 2024-07-17 14:36:19 +09:00
2 changed files with 5 additions and 0 deletions
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4
Userland/Libraries/LibJS/Runtime/AbstractOperations.cpp
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@ -87,6 +87,10 @@ ThrowCompletionOr<NonnullGCPtr<Object>> construct_impl(VM&, FunctionObject& func
// 7.3.19 LengthOfArrayLike ( obj ), https://tc39.es/ecma262/#sec-lengthofarraylike
ThrowCompletionOr<size_t> length_of_array_like(VM& vm, Object const& object)
{
// OPTIMIZATION: For Array objects with a magical "length" property, it should always reflect the size of indexed property storage.
if (object.has_magical_length_property())
return object.indexed_properties().array_like_size();
// 1. Return ℝ(? ToLength(? Get(obj, "length"))).
return TRY(object.get(vm.names.length)).to_length(vm);
}