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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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10
Libraries/LibJS/Runtime/SetIterator.h
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@ -6,13 +6,14 @@
#pragma once
#include <AK/HashTable.h>
#include <LibJS/Runtime/Iterator.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/Set.h>
namespace JS {
class SetIterator final : public Object {
class SetIterator final : public Object
, public BuiltinIterator {
JS_OBJECT(SetIterator, Object);
GC_DECLARE_ALLOCATOR(SetIterator);
@ -21,9 +22,8 @@ public:
virtual ~SetIterator() override = default;
Set& set() const { return m_set; }
bool done() const { return m_done; }
Object::PropertyKind iteration_kind() const { return m_iteration_kind; }
BuiltinIterator* as_builtin_iterator() override { return this; }
ThrowCompletionOr<void> next(VM&, bool& done, Value& value) override;
private:
friend class SetIteratorPrototype;