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LibJS: Replace the custom unwind mechanism with completions :^)
This includes: - Parsing proper LabelledStatements with try_parse_labelled_statement() - Removing LabelableStatement - Implementing the LoopEvaluation semantics via loop_evaluation() in each IterationStatement subclass; and IterationStatement evaluation via {For,ForIn,ForOf,ForAwaitOf,While,DoWhile}Statement::execute() - Updating ReturnStatement, BreakStatement and ContinueStatement to return the appropriate completion types - Basically reimplementing TryStatement and SwitchStatement according to the spec, using completions - Honoring result completion types in AsyncBlockStart and OrdinaryCallEvaluateBody - Removing any uses of the VM unwind mechanism - most importantly, VM::throw_exception() now exclusively sets an exception and no longer triggers any unwinding mechanism. However, we already did a good job updating all of LibWeb and userland applications to not use it, and the few remaining uses elsewhere don't rely on unwinding AFAICT.
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@ -120,7 +120,7 @@ public:
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NonnullRefPtr<ExportStatement> parse_export_statement(Program& program);
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RefPtr<FunctionExpression> try_parse_arrow_function_expression(bool expect_parens, bool is_async = false);
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RefPtr<Statement> try_parse_labelled_statement(AllowLabelledFunction allow_function);
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RefPtr<LabelledStatement> try_parse_labelled_statement(AllowLabelledFunction allow_function);
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RefPtr<MetaProperty> try_parse_new_target_expression();
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RefPtr<MetaProperty> try_parse_import_meta_expression();
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NonnullRefPtr<ImportCall> parse_import_call();
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