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LibJS: Allow advancing built-in iterators without result object creation

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Expose a method on built-in iterators that allows retrieving the next
iteration result without allocating a JS::Object. This change is a
preparation for optimizing for..of and for..in loops.
This commit is contained in:
Aliaksandr Kalenik 2025-04-30 16:29:41 +03:00 • committed by Andreas Kling
commit ab52d86a69
Notes: github-actions[bot] 2025-04-30 18:52:44 +00:00
15 changed files with 234 additions and 169 deletions
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6
Libraries/LibJS/Runtime/Iterator.h
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@ -67,6 +67,12 @@ enum class PrimitiveHandling {
RejectPrimitives,
};
class BuiltinIterator {
public:
virtual ~BuiltinIterator() = default;
virtual ThrowCompletionOr<void> next(VM&, bool& done, Value& value) = 0;
};
// 7.4.12 IfAbruptCloseIterator ( value, iteratorRecord ), https://tc39.es/ecma262/#sec-ifabruptcloseiterator
#define TRY_OR_CLOSE_ITERATOR(vm, iterator_record, expression) \
({ \