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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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3
Libraries/LibJS/Runtime/ExecutionContext.cpp
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@ -82,7 +82,8 @@ void ExecutionContext::visit_edges(Cell::Visitor& visitor)
visitor.visit(lexical_environment);
visitor.visit(private_environment);
visitor.visit(context_owner);
visitor.visit(this_value);
if (this_value.has_value())
visitor.visit(*this_value);
visitor.visit(executable);
visitor.visit(function_name);
visitor.visit(arguments);