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LibJS: Disable optimization in IteratorNextUnpack if next() is redefined
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Browse source 
81b6a11 regressed correctness by always bypassing the `next()` method
resolution for built-in iterators, causing incorrect behavior when
`next()` was redefined on built-in prototypes. This change fixes the
issue by storing a flag on built-in prototypes indicating whether
`next()` has ever been redefined.
This commit is contained in:
Aliaksandr Kalenik 2025-05-12 04:27:25 +03:00 • committed by Alexander Kalenik
commit f405d71657
Notes: github-actions[bot] 2025-05-12 11:42:25 +00:00
18 changed files with 151 additions and 8 deletions
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3
Libraries/LibJS/Runtime/MapIterator.cpp
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@ -6,6 +6,7 @@
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/MapIterator.h>
#include <LibJS/Runtime/MapIteratorPrototype.h>
namespace JS {
@ -22,6 +23,8 @@ MapIterator::MapIterator(Map& map, Object::PropertyKind iteration_kind, Object&
, m_iteration_kind(iteration_kind)
, m_iterator(static_cast<Map const&>(map).begin())
{
auto& map_iterator_prototype = as<MapIteratorPrototype>(prototype);
m_next_method_was_redefined = map_iterator_prototype.next_method_was_redefined();
}
void MapIterator::visit_edges(Cell::Visitor& visitor)