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LibJS/Bytecode: Always return false on attempt to delete local variable

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Since it is not possible for delete operator to return true when it is
applied to local variable, DeleteVariable can safely always return
false for locals.

This also fixes operators/delete-local-variable.js in test-js.
This commit is contained in:
Aliaksandr Kalenik 2023-07-08 20:29:13 +02:00 • committed by Andreas Kling
commit 167495b87b
Notes: sideshowbarker 2024-07-17 03:16:02 +09:00
1 changed files with 4 additions and 1 deletions
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5
Userland/Libraries/LibJS/Bytecode/Generator.cpp
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@ -298,7 +298,10 @@ CodeGenerationErrorOr<void> Generator::emit_delete_reference(JS::ASTNode const&
{
if (is<Identifier>(node)) {
auto& identifier = static_cast<Identifier const&>(node);
emit<Bytecode::Op::DeleteVariable>(intern_identifier(identifier.string()));
if (identifier.is_local())
emit<Bytecode::Op::LoadImmediate>(Value(false));
else
emit<Bytecode::Op::DeleteVariable>(intern_identifier(identifier.string()));
return {};
}