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LibJS: Do more comprehensive check if next() fast path is possible

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Before this change each built-in iterator object has a boolean
`m_next_method_was_redefined`. If user code later changed the iterator’s
prototype (e.g. `Object.setPrototypeOf()`), we still believed the
built-in fast-path was safe and skipped the user supplied override,
producing wrong results.

With this change
`BuiltinIterator::as_builtin_iterator_if_next_is_not_redefined()` looks
up the current `next` property and verifies that it is still the
built-in native function.
This commit is contained in:
Aliaksandr Kalenik 2025-06-01 18:44:18 +02:00 • committed by Alexander Kalenik
parent 0fcb574041
commit 285bc005cb
Notes: github-actions[bot] 2025-06-01 22:16:38 +00:00
25 changed files with 168 additions and 98 deletions
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7
Libraries/LibJS/Runtime/StringIterator.h
View file

@ -23,12 +23,7 @@ public:
virtual ~StringIterator() override = default;
BuiltinIterator* as_builtin_iterator_if_next_is_not_redefined() override
{
if (m_next_method_was_redefined)
return nullptr;
return this;
}
BuiltinIterator* as_builtin_iterator_if_next_is_not_redefined(IteratorRecord const&) override;
ThrowCompletionOr<void> next(VM&, bool& done, Value& value) override;
private: