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LibJS: Get rid of unnecessary work from canonical_numeric_index_string

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The spec version of canonical_numeric_index_string is absurdly complex,
and ends up converting from a string to a number, and then back again
which is both slow and also requires a few allocations and a string
compare.

Instead lets use the logic we already have as that is much more
efficient.

This improves performance of all non-numeric property names.
This commit is contained in:
Anonymous 2022-02-12 12:51:06 -08:00 • committed by Andreas Kling
parent 44a2ebea00
commit 3a184f7841
8 changed files with 57 additions and 98 deletions
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3
Userland/Libraries/LibJS/Runtime/AbstractOperations.h
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@ -39,8 +39,9 @@ bool validate_and_apply_property_descriptor(Object*, PropertyKey const&, bool ex
ThrowCompletionOr<Object*> get_prototype_from_constructor(GlobalObject&, FunctionObject const& constructor, Object* (GlobalObject::*intrinsic_default_prototype)());
Object* create_unmapped_arguments_object(GlobalObject&, Span<Value> arguments);
Object* create_mapped_arguments_object(GlobalObject&, FunctionObject&, Vector<FunctionNode::Parameter> const&, Span<Value> arguments, Environment&);
Value canonical_numeric_index_string(GlobalObject&, PropertyKey const&);
Optional<u32> canonical_numeric_index_string(PropertyKey const&);
ThrowCompletionOr<String> get_substitution(GlobalObject&, Utf16View const& matched, Utf16View const& str, size_t position, Span<Value> captures, Value named_captures, Value replacement);
double string_to_number(const PrimitiveString&);
enum class CallerMode {
Strict,