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LibJS: Use Identifier to represent name of ClassExpression
By using Identifier class to represent the name of a class expression, it becomes possible to consistently store information within the identifier object, indicating whether the name refers to a local variable or not.
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4 changed files with 20 additions and 14 deletions
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@ -1852,7 +1852,7 @@ Completion ClassExpression::execute(Interpreter& interpreter) const
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// 1. Let className be StringValue of BindingIdentifier.
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// 2. Let value be ? ClassDefinitionEvaluation of ClassTail with arguments className and className.
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auto* value = TRY(class_definition_evaluation(interpreter.vm(), m_name, m_name.is_null() ? "" : m_name));
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auto* value = TRY(class_definition_evaluation(interpreter.vm(), name(), name()));
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// 3. Set value.[[SourceText]] to the source text matched by ClassExpression.
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value->set_source_text(m_source_text);
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@ -2311,7 +2311,7 @@ ThrowCompletionOr<void> ClassDeclaration::for_each_bound_name(ThrowCompletionOrV
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void ClassExpression::dump(int indent) const
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{
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print_indent(indent);
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outln("ClassExpression: \"{}\"", m_name);
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outln("ClassExpression: \"{}\"", name());
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print_indent(indent);
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outln("(Constructor)");
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@ -1405,7 +1405,7 @@ public:
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class ClassExpression final : public Expression {
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public:
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ClassExpression(SourceRange source_range, DeprecatedString name, DeprecatedString source_text, RefPtr<FunctionExpression const> constructor, RefPtr<Expression const> super_class, Vector<NonnullRefPtr<ClassElement const>> elements)
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ClassExpression(SourceRange source_range, RefPtr<Identifier const> name, DeprecatedString source_text, RefPtr<FunctionExpression const> constructor, RefPtr<Expression const> super_class, Vector<NonnullRefPtr<ClassElement const>> elements)
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: Expression(source_range)
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, m_name(move(name))
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, m_source_text(move(source_text))
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@ -1415,7 +1415,8 @@ public:
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{
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}
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StringView name() const { return m_name; }
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StringView name() const { return m_name ? m_name->string().view() : ""sv; }
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DeprecatedString const& source_text() const { return m_source_text; }
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RefPtr<FunctionExpression const> constructor() const { return m_constructor; }
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@ -1424,7 +1425,7 @@ public:
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virtual Bytecode::CodeGenerationErrorOr<void> generate_bytecode(Bytecode::Generator&) const override;
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virtual Bytecode::CodeGenerationErrorOr<void> generate_bytecode_with_lhs_name(Bytecode::Generator&, Optional<Bytecode::IdentifierTableIndex> lhs_name) const;
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bool has_name() const { return !m_name.is_empty(); }
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bool has_name() const { return m_name; }
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ThrowCompletionOr<ECMAScriptFunctionObject*> class_definition_evaluation(VM&, DeprecatedFlyString const& binding_name = {}, DeprecatedFlyString const& class_name = {}) const;
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ThrowCompletionOr<ECMAScriptFunctionObject*> create_class_constructor(VM&, Environment* class_environment, Environment* environment, Value super_class, DeprecatedFlyString const& binding_name = {}, DeprecatedFlyString const& class_name = {}) const;
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@ -1432,7 +1433,7 @@ public:
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private:
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virtual bool is_class_expression() const override { return true; }
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DeprecatedString m_name;
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RefPtr<Identifier const> m_name;
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DeprecatedString m_source_text;
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RefPtr<FunctionExpression const> m_constructor;
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RefPtr<Expression const> m_super_class;
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@ -2323,7 +2323,7 @@ Bytecode::CodeGenerationErrorOr<void> ClassExpression::generate_bytecode_with_lh
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if (has_name() || !lhs_name.has_value()) {
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// NOTE: Step 3.a is not a part of NewClass instruction because it is assumed to be done before super class expression evaluation
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auto interned_index = generator.intern_identifier(m_name);
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auto interned_index = generator.intern_identifier(name());
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generator.emit<Bytecode::Op::CreateVariable>(interned_index, Bytecode::Op::EnvironmentMode::Lexical, true);
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}
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@ -1071,12 +1071,17 @@ NonnullRefPtr<ClassExpression const> Parser::parse_class_expression(bool expect_
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RefPtr<FunctionExpression const> constructor;
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HashTable<DeprecatedFlyString> found_private_names;
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DeprecatedFlyString class_name = expect_class_name || match_identifier() || match(TokenType::Yield) || match(TokenType::Await)
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? consume_identifier_reference().DeprecatedFlyString_value()
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: "";
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RefPtr<Identifier const> class_name { nullptr };
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if (expect_class_name || match_identifier() || match(TokenType::Yield) || match(TokenType::Await)) {
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class_name = create_ast_node<Identifier const>(
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{ m_source_code, rule_start.position(), position() },
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consume_identifier_reference().DeprecatedFlyString_value()
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);
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}
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check_identifier_name_for_assignment_validity(class_name, true);
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if (m_state.in_class_static_init_block && class_name == "await"sv)
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if (class_name)
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check_identifier_name_for_assignment_validity(class_name->string(), true);
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if (m_state.in_class_static_init_block && class_name && class_name->string() == "await"sv)
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syntax_error("Identifier must not be a reserved word in modules ('await')");
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if (match(TokenType::Extends)) {
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@ -1365,12 +1370,12 @@ NonnullRefPtr<ClassExpression const> Parser::parse_class_expression(bool expect_
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constructor_body->append(create_ast_node<ReturnStatement>({ m_source_code, rule_start.position(), position() }, move(super_call)));
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constructor = create_ast_node<FunctionExpression>(
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{ m_source_code, rule_start.position(), position() }, class_name, "",
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{ m_source_code, rule_start.position(), position() }, class_name ? class_name->string() : "", "",
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move(constructor_body), Vector { FunctionParameter { move(argument_name), nullptr, true } }, 0, FunctionKind::Normal,
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/* is_strict_mode */ true, /* might_need_arguments_object */ false, /* contains_direct_call_to_eval */ false);
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} else {
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constructor = create_ast_node<FunctionExpression>(
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{ m_source_code, rule_start.position(), position() }, class_name, "",
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{ m_source_code, rule_start.position(), position() }, class_name ? class_name->string() : "", "",
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move(constructor_body), Vector<FunctionParameter> {}, 0, FunctionKind::Normal,
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/* is_strict_mode */ true, /* might_need_arguments_object */ false, /* contains_direct_call_to_eval */ false);
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}
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