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LibJS: Do more comprehensive check if next()
fast path is possible
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.
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285bc005cb
Notes:
github-actions[bot]
2025-06-01 22:16:38 +00:00
Author: https://github.com/kalenikaliaksandr
Commit: 285bc005cb
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4953
25 changed files with 168 additions and 98 deletions
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@ -6,8 +6,8 @@
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#include <AK/Utf8View.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/NativeFunction.h>
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#include <LibJS/Runtime/StringIterator.h>
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#include <LibJS/Runtime/StringIteratorPrototype.h>
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namespace JS {
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@ -23,8 +23,19 @@ StringIterator::StringIterator(String string, Object& prototype)
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, m_string(move(string))
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, m_iterator(Utf8View(m_string).begin())
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{
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auto& string_iterator_prototype = as<StringIteratorPrototype>(prototype);
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m_next_method_was_redefined = string_iterator_prototype.next_method_was_redefined();
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}
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BuiltinIterator* StringIterator::as_builtin_iterator_if_next_is_not_redefined(IteratorRecord const& iterator_record)
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{
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if (iterator_record.next_method.is_object()) {
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auto const& next_function = iterator_record.next_method.as_object();
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if (next_function.is_native_function()) {
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auto const& native_function = static_cast<NativeFunction const&>(next_function);
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if (native_function.is_string_prototype_next_builtin())
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return this;
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}
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}
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return nullptr;
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}
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ThrowCompletionOr<void> StringIterator::next(VM& vm, bool& done, Value& value)
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