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LibJS: Use Identifier to represent name of ClassExpression

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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.
This commit is contained in:
Aliaksandr Kalenik 2023-06-30 16:51:39 +03:00 • committed by Andreas Kling
parent 4a83fb1b12
commit c734f2b5e6
4 changed files with 20 additions and 14 deletions
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4
Userland/Libraries/LibJS/AST.cpp
View file

@ -1852,7 +1852,7 @@ Completion ClassExpression::execute(Interpreter& interpreter) const
// 1. Let className be StringValue of BindingIdentifier.
// 2. Let value be ? ClassDefinitionEvaluation of ClassTail with arguments className and className.
auto* value = TRY(class_definition_evaluation(interpreter.vm(), m_name, m_name.is_null() ? "" : m_name));
auto* value = TRY(class_definition_evaluation(interpreter.vm(), name(), name()));
// 3. Set value.[[SourceText]] to the source text matched by ClassExpression.
value->set_source_text(m_source_text);
@ -2311,7 +2311,7 @@ ThrowCompletionOr<void> ClassDeclaration::for_each_bound_name(ThrowCompletionOrV
void ClassExpression::dump(int indent) const
{
print_indent(indent);
outln("ClassExpression: \"{}\"", m_name);
outln("ClassExpression: \"{}\"", name());
print_indent(indent);
outln("(Constructor)");

9
Userland/Libraries/LibJS/AST.h
View file

@ -1405,7 +1405,7 @@ public:
class ClassExpression final : public Expression {
public:
ClassExpression(SourceRange source_range, DeprecatedString name, DeprecatedString source_text, RefPtr<FunctionExpression const> constructor, RefPtr<Expression const> super_class, Vector<NonnullRefPtr<ClassElement const>> elements)
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)
: Expression(source_range)
, m_name(move(name))
, m_source_text(move(source_text))
@ -1415,7 +1415,8 @@ public:
{
}
StringView name() const { return m_name; }
StringView name() const { return m_name ? m_name->string().view() : ""sv; }
DeprecatedString const& source_text() const { return m_source_text; }
RefPtr<FunctionExpression const> constructor() const { return m_constructor; }
@ -1424,7 +1425,7 @@ public:
virtual Bytecode::CodeGenerationErrorOr<void> generate_bytecode(Bytecode::Generator&) const override;
virtual Bytecode::CodeGenerationErrorOr<void> generate_bytecode_with_lhs_name(Bytecode::Generator&, Optional<Bytecode::IdentifierTableIndex> lhs_name) const;
bool has_name() const { return !m_name.is_empty(); }
bool has_name() const { return m_name; }
ThrowCompletionOr<ECMAScriptFunctionObject*> class_definition_evaluation(VM&, DeprecatedFlyString const& binding_name = {}, DeprecatedFlyString const& class_name = {}) const;
ThrowCompletionOr<ECMAScriptFunctionObject*> create_class_constructor(VM&, Environment* class_environment, Environment* environment, Value super_class, DeprecatedFlyString const& binding_name = {}, DeprecatedFlyString const& class_name = {}) const;
@ -1432,7 +1433,7 @@ public:
private:
virtual bool is_class_expression() const override { return true; }
DeprecatedString m_name;
RefPtr<Identifier const> m_name;
DeprecatedString m_source_text;
RefPtr<FunctionExpression const> m_constructor;
RefPtr<Expression const> m_super_class;

2
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
View file

@ -2323,7 +2323,7 @@ Bytecode::CodeGenerationErrorOr<void> ClassExpression::generate_bytecode_with_lh
if (has_name() || !lhs_name.has_value()) {
// NOTE: Step 3.a is not a part of NewClass instruction because it is assumed to be done before super class expression evaluation
auto interned_index = generator.intern_identifier(m_name);
auto interned_index = generator.intern_identifier(name());
generator.emit<Bytecode::Op::CreateVariable>(interned_index, Bytecode::Op::EnvironmentMode::Lexical, true);
}

19
Userland/Libraries/LibJS/Parser.cpp
View file

@ -1071,12 +1071,17 @@ NonnullRefPtr<ClassExpression const> Parser::parse_class_expression(bool expect_
RefPtr<FunctionExpression const> constructor;
HashTable<DeprecatedFlyString> found_private_names;
DeprecatedFlyString class_name = expect_class_name || match_identifier() || match(TokenType::Yield) || match(TokenType::Await)
? consume_identifier_reference().DeprecatedFlyString_value()
: "";
RefPtr<Identifier const> class_name { nullptr };
if (expect_class_name || match_identifier() || match(TokenType::Yield) || match(TokenType::Await)) {
class_name = create_ast_node<Identifier const>(
{ m_source_code, rule_start.position(), position() },
consume_identifier_reference().DeprecatedFlyString_value()
);
}
check_identifier_name_for_assignment_validity(class_name, true);
if (m_state.in_class_static_init_block && class_name == "await"sv)
if (class_name)
check_identifier_name_for_assignment_validity(class_name->string(), true);
if (m_state.in_class_static_init_block && class_name && class_name->string() == "await"sv)
syntax_error("Identifier must not be a reserved word in modules ('await')");
if (match(TokenType::Extends)) {
@ -1365,12 +1370,12 @@ NonnullRefPtr<ClassExpression const> Parser::parse_class_expression(bool expect_
constructor_body->append(create_ast_node<ReturnStatement>({ m_source_code, rule_start.position(), position() }, move(super_call)));
constructor = create_ast_node<FunctionExpression>(
{ m_source_code, rule_start.position(), position() }, class_name, "",
{ m_source_code, rule_start.position(), position() }, class_name ? class_name->string() : "", "",
move(constructor_body), Vector { FunctionParameter { move(argument_name), nullptr, true } }, 0, FunctionKind::Normal,
/* is_strict_mode */ true, /* might_need_arguments_object */ false, /* contains_direct_call_to_eval */ false);
} else {
constructor = create_ast_node<FunctionExpression>(
{ m_source_code, rule_start.position(), position() }, class_name, "",
{ m_source_code, rule_start.position(), position() }, class_name ? class_name->string() : "", "",
move(constructor_body), Vector<FunctionParameter> {}, 0, FunctionKind::Normal,
/* is_strict_mode */ true, /* might_need_arguments_object */ false, /* contains_direct_call_to_eval */ false);
}