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LibJS/Bytecode: Implement Annex B Initializers in ForIn Statement Heads

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Daniel Bertalan 2023-06-28 09:07:33 +02:00 • committed by Andreas Kling
parent 4e0b52d009
commit fda619c7c2
1 changed files with 13 additions and 6 deletions
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19
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
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@ -2393,12 +2393,19 @@ static Bytecode::CodeGenerationErrorOr<ForInOfHeadEvaluationResult> for_in_of_he
result.is_destructuring = variable_declaration.declarations().first()->target().has<NonnullRefPtr<BindingPattern const>>();
result.lhs_kind = variable_declaration.is_lexical_declaration() ? LHSKind::LexicalBinding : LHSKind::VarBinding;
// 1. Let oldEnv be the running execution context's LexicalEnvironment.
// NOTE: 'uninitializedBoundNames' refers to the lexical bindings (i.e. Const/Let) present in the second and last form.
// 2. If uninitializedBoundNames is not an empty List, then
if (variable_declaration.declaration_kind() != DeclarationKind::Var) {
if (variable_declaration.declaration_kind() == DeclarationKind::Var) {
// B.3.5 Initializers in ForIn Statement Heads, https://tc39.es/ecma262/#sec-initializers-in-forin-statement-heads
auto& variable = variable_declaration.declarations().first();
if (variable->init()) {
VERIFY(variable->target().has<NonnullRefPtr<Identifier const>>());
auto& binding_id = variable->target().get<NonnullRefPtr<Identifier const>>()->string();
TRY(generator.emit_named_evaluation_if_anonymous_function(*variable->init(), binding_id));
generator.emit<Bytecode::Op::SetVariable>(generator.intern_identifier(binding_id));
}
} else {
// 1. Let oldEnv be the running execution context's LexicalEnvironment.
// NOTE: 'uninitializedBoundNames' refers to the lexical bindings (i.e. Const/Let) present in the second and last form.
// 2. If uninitializedBoundNames is not an empty List, then
entered_lexical_scope = true;
// a. Assert: uninitializedBoundNames has no duplicate entries.
// b. Let newEnv be NewDeclarativeEnvironment(oldEnv).