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LibJS: Make Value() default-construct the undefined value

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The special empty value (that we use for array holes, Optional<Value>
when empty and a few other other placeholder/sentinel tasks) still
exists, but you now create one via JS::js_special_empty_value() and
check for it with Value::is_special_empty_value().

The main idea here is to make it very unlikely to accidentally create an
unexpected special empty value.
This commit is contained in:
Andreas Kling 2025-04-04 23:16:34 +02:00 • committed by Andreas Kling
commit 3cf50539ec
Notes: github-actions[bot] 2025-04-05 09:21:31 +00:00
43 changed files with 165 additions and 122 deletions
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2
Libraries/LibJS/Runtime/GeneratorObject.cpp
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@ -85,7 +85,7 @@ ThrowCompletionOr<Value> GeneratorObject::execute(VM& vm, Completion const& comp
auto generated_value = [](Value value) -> Value {
if (value.is_cell())
return static_cast<GeneratorResult const&>(value.as_cell()).result();
return value.is_empty() ? js_undefined() : value;
return value.is_special_empty_value() ? js_undefined() : value;
};
auto generated_continuation = [&](Value value) -> Optional<size_t> {