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LibJS: Make Value() default-construct the undefined value
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.
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Notes:
github-actions[bot]
2025-04-05 09:21:31 +00:00
Author: https://github.com/awesomekling
Commit: 3cf50539ec
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4232
43 changed files with 165 additions and 122 deletions
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@ -298,7 +298,7 @@ public:
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emit<Bytecode::Op::PrepareYield>(Operand(Register::saved_return_value()), value);
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else
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emit<Bytecode::Op::Mov>(Operand(Register::saved_return_value()), value);
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emit<Bytecode::Op::Mov>(Operand(Register::exception()), add_constant(Value {}));
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emit<Bytecode::Op::Mov>(Operand(Register::exception()), add_constant(js_special_empty_value()));
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emit<Bytecode::Op::Jump>(Label { *m_current_basic_block->finalizer() });
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return;
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}
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