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LibJS: Use local variables for function declarations when possible

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Previously, the usage of local variables was limited for all function
declarations. This change relaxes the restriction and only prohibits
locals for hoistable annexB declarations.
This commit is contained in:
Aliaksandr Kalenik 2023-07-08 19:31:41 +02:00 • committed by Andreas Kling
parent 167495b87b
commit 8b6450842e
4 changed files with 36 additions and 26 deletions
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8
Userland/Libraries/LibJS/AST.cpp
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@ -4769,8 +4769,12 @@ void ScopeNode::block_declaration_instantiation(VM& vm, Environment* environment
if (is<FunctionDeclaration>(declaration)) {
auto& function_declaration = static_cast<FunctionDeclaration const&>(declaration);
auto function = ECMAScriptFunctionObject::create(realm, function_declaration.name(), function_declaration.source_text(), function_declaration.body(), function_declaration.parameters(), function_declaration.function_length(), function_declaration.local_variables_names(), environment, private_environment, function_declaration.kind(), function_declaration.is_strict_mode(), function_declaration.might_need_arguments_object(), function_declaration.contains_direct_call_to_eval());
VERIFY(is<DeclarativeEnvironment>(*environment));
static_cast<DeclarativeEnvironment&>(*environment).initialize_or_set_mutable_binding({}, vm, function_declaration.name(), function);
if (vm.bytecode_interpreter_if_exists() && function_declaration.name_identifier()->is_local()) {
vm.running_execution_context().local_variables[function_declaration.name_identifier()->local_variable_index()] = function;
} else {
VERIFY(is<DeclarativeEnvironment>(*environment));
static_cast<DeclarativeEnvironment&>(*environment).initialize_or_set_mutable_binding({}, vm, function_declaration.name(), function);
}
}
}));
}