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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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6
Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp
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@ -616,7 +616,11 @@ ThrowCompletionOr<void> ECMAScriptFunctionObject::function_declaration_instantia
auto private_environment = callee_context.private_environment;
for (auto& declaration : functions_to_initialize) {
auto function = ECMAScriptFunctionObject::create(realm, declaration.name(), declaration.source_text(), declaration.body(), declaration.parameters(), declaration.function_length(), declaration.local_variables_names(), lex_environment, private_environment, declaration.kind(), declaration.is_strict_mode(), declaration.might_need_arguments_object(), declaration.contains_direct_call_to_eval());
MUST(var_environment->set_mutable_binding(vm, declaration.name(), function, false));
if ((vm.bytecode_interpreter_if_exists() || kind() == FunctionKind::Generator) && declaration.name_identifier()->is_local()) {
callee_context.local_variables[declaration.name_identifier()->local_variable_index()] = function;
} else {
MUST(var_environment->set_mutable_binding(vm, declaration.name(), function, false));
}
}
if (is<DeclarativeEnvironment>(*lex_environment))