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https://github.com/RGBCube/serenity
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LibJS: Convert ScopeNode declaration functions to ThrowCompletionOr
This removes a number of vm.exception() checks which are now caught
directly by TRY. Make use of these checks in
{Global, Eval}DeclarationInstantiation and while we're here add spec
comments.
This commit is contained in:
davidot
Linus Groh
parent
cc7a117f0f
commit
4136cbdb09
6 changed files with 462 additions and 305 deletions
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@ -256,10 +256,21 @@ Completion FunctionDeclaration::execute(Interpreter& interpreter, GlobalObject&
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if (m_is_hoisted) {
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// Perform special annexB steps see step 3 of: https://tc39.es/ecma262/#sec-web-compat-functiondeclarationinstantiation
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// i. Let genv be the running execution context's VariableEnvironment.
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auto* variable_environment = interpreter.vm().running_execution_context().variable_environment;
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// ii. Let benv be the running execution context's LexicalEnvironment.
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auto* lexical_environment = interpreter.vm().running_execution_context().lexical_environment;
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// iii. Let fobj be ! benv.GetBindingValue(F, false).
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auto function_object = MUST(lexical_environment->get_binding_value(global_object, name(), false));
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MUST(variable_environment->set_mutable_binding(global_object, name(), function_object, false));
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// iv. Perform ? genv.SetMutableBinding(F, fobj, false).
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TRY(variable_environment->set_mutable_binding(global_object, name(), function_object, false));
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// v. Return NormalCompletion(empty).
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return normal_completion({});
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}
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// 1. Return NormalCompletion(empty).
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@ -2113,10 +2124,12 @@ void ClassDeclaration::dump(int indent) const
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m_class_expression->dump(indent + 1);
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}
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void ClassDeclaration::for_each_bound_name(IteratorOrVoidFunction<FlyString const&> callback) const
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ThrowCompletionOr<void> ClassDeclaration::for_each_bound_name(ThrowCompletionOrVoidCallback<FlyString const&>&& callback) const
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{
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if (!m_class_expression->name().is_empty())
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callback(m_class_expression->name());
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if (m_class_expression->name().is_empty())
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return {};
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return callback(m_class_expression->name());
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}
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void ClassExpression::dump(int indent) const
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@ -2241,6 +2254,23 @@ bool BindingPattern::contains_expression() const
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return false;
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}
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ThrowCompletionOr<void> BindingPattern::for_each_bound_name(ThrowCompletionOrVoidCallback<FlyString const&>&& callback) const
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{
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for (auto const& entry : entries) {
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auto const& alias = entry.alias;
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if (alias.has<NonnullRefPtr<Identifier>>()) {
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TRY(callback(alias.get<NonnullRefPtr<Identifier>>()->string()));
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} else if (alias.has<NonnullRefPtr<BindingPattern>>()) {
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TRY(alias.get<NonnullRefPtr<BindingPattern>>()->for_each_bound_name(forward<decltype(callback)>(callback)));
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} else {
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auto const& name = entry.name;
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if (name.has<NonnullRefPtr<Identifier>>())
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TRY(callback(name.get<NonnullRefPtr<Identifier>>()->string()));
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}
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}
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return {};
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}
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void BindingPattern::dump(int indent) const
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{
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print_indent(indent);
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@ -2324,10 +2354,11 @@ void FunctionDeclaration::dump(int indent) const
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FunctionNode::dump(indent, class_name());
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}
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void FunctionDeclaration::for_each_bound_name(IteratorOrVoidFunction<FlyString const&> callback) const
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ThrowCompletionOr<void> FunctionDeclaration::for_each_bound_name(ThrowCompletionOrVoidCallback<const FlyString&>&& callback) const
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{
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if (!name().is_empty())
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callback(name());
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if (name().is_empty())
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return {};
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return callback(name());
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}
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void FunctionExpression::dump(int indent) const
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@ -2861,19 +2892,21 @@ Completion VariableDeclarator::execute(Interpreter& interpreter, GlobalObject&)
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VERIFY_NOT_REACHED();
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}
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void VariableDeclaration::for_each_bound_name(IteratorOrVoidFunction<FlyString const&> callback) const
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ThrowCompletionOr<void> VariableDeclaration::for_each_bound_name(ThrowCompletionOrVoidCallback<FlyString const&>&& callback) const
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{
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for (auto& entry : declarations()) {
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entry.target().template visit(
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[&](const NonnullRefPtr<Identifier>& id) {
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callback(id->string());
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for (auto const& entry : declarations()) {
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TRY(entry.target().visit(
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[&](NonnullRefPtr<Identifier> const& id) {
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return callback(id->string());
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},
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[&](const NonnullRefPtr<BindingPattern>& binding) {
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binding->for_each_bound_name([&](const auto& name) {
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callback(name);
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[&](NonnullRefPtr<BindingPattern> const& binding) {
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return binding->for_each_bound_name([&](auto const& name) {
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return callback(name);
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});
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});
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}));
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}
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return {};
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}
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void VariableDeclaration::dump(int indent) const
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@ -4097,76 +4130,62 @@ Completion DebuggerStatement::execute(Interpreter& interpreter, GlobalObject&) c
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// 3. Return result.
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return result;
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}
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void ScopeNode::for_each_lexically_scoped_declaration(IteratorOrVoidFunction<Declaration const&>&& callback) const
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ThrowCompletionOr<void> ScopeNode::for_each_lexically_scoped_declaration(ThrowCompletionOrVoidCallback<Declaration const&>&& callback) const
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{
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for (auto& declaration : m_lexical_declarations) {
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if (callback(declaration) == IterationDecision::Break)
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break;
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}
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for (auto& declaration : m_lexical_declarations)
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TRY(callback(declaration));
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return {};
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}
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void ScopeNode::for_each_lexically_declared_name(IteratorOrVoidFunction<FlyString const&>&& callback) const
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ThrowCompletionOr<void> ScopeNode::for_each_lexically_declared_name(ThrowCompletionOrVoidCallback<FlyString const&>&& callback) const
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{
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auto running = true;
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for (auto& declaration : m_lexical_declarations) {
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declaration.for_each_bound_name([&](auto const& name) {
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if (callback(name) == IterationDecision::Break) {
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running = false;
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return IterationDecision::Break;
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}
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return IterationDecision::Continue;
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});
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if (!running)
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break;
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for (auto const& declaration : m_lexical_declarations) {
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TRY(declaration.for_each_bound_name([&](auto const& name) {
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return callback(name);
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}));
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}
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return {};
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}
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void ScopeNode::for_each_var_declared_name(IteratorOrVoidFunction<FlyString const&>&& callback) const
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ThrowCompletionOr<void> ScopeNode::for_each_var_declared_name(ThrowCompletionOrVoidCallback<FlyString const&>&& callback) const
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{
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auto running = true;
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for (auto& declaration : m_var_declarations) {
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declaration.for_each_bound_name([&](auto const& name) {
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if (callback(name) == IterationDecision::Break) {
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running = false;
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return IterationDecision::Break;
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}
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return IterationDecision::Continue;
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});
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if (!running)
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break;
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TRY(declaration.for_each_bound_name([&](auto const& name) {
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return callback(name);
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}));
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}
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return {};
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}
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void ScopeNode::for_each_var_function_declaration_in_reverse_order(IteratorOrVoidFunction<FunctionDeclaration const&>&& callback) const
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ThrowCompletionOr<void> ScopeNode::for_each_var_function_declaration_in_reverse_order(ThrowCompletionOrVoidCallback<FunctionDeclaration const&>&& callback) const
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{
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for (ssize_t i = m_var_declarations.size() - 1; i >= 0; i--) {
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auto& declaration = m_var_declarations[i];
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if (is<FunctionDeclaration>(declaration)) {
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if (callback(static_cast<FunctionDeclaration const&>(declaration)) == IterationDecision::Break)
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break;
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}
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if (is<FunctionDeclaration>(declaration))
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TRY(callback(static_cast<FunctionDeclaration const&>(declaration)));
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}
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return {};
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}
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void ScopeNode::for_each_var_scoped_variable_declaration(IteratorOrVoidFunction<VariableDeclaration const&>&& callback) const
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ThrowCompletionOr<void> ScopeNode::for_each_var_scoped_variable_declaration(ThrowCompletionOrVoidCallback<VariableDeclaration const&>&& callback) const
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{
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for (auto& declaration : m_var_declarations) {
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if (!is<FunctionDeclaration>(declaration)) {
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VERIFY(is<VariableDeclaration>(declaration));
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if (callback(static_cast<VariableDeclaration const&>(declaration)) == IterationDecision::Break)
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break;
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TRY(callback(static_cast<VariableDeclaration const&>(declaration)));
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}
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}
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return {};
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}
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void ScopeNode::for_each_function_hoistable_with_annexB_extension(IteratorOrVoidFunction<FunctionDeclaration&>&& callback) const
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ThrowCompletionOr<void> ScopeNode::for_each_function_hoistable_with_annexB_extension(ThrowCompletionOrVoidCallback<FunctionDeclaration&>&& callback) const
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{
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for (auto& function : m_functions_hoistable_with_annexB_extension) {
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// We need const_cast here since it might have to set a property on function declaration.
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if (callback(const_cast<FunctionDeclaration&>(function)) == IterationDecision::Break)
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break;
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TRY(callback(const_cast<FunctionDeclaration&>(function)));
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}
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return {};
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}
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void ScopeNode::add_lexical_declaration(NonnullRefPtr<Declaration> declaration)
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@ -4362,6 +4381,7 @@ void ScopeNode::block_declaration_instantiation(GlobalObject& global_object, Env
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// See also B.3.2.6 Changes to BlockDeclarationInstantiation, https://tc39.es/ecma262/#sec-web-compat-blockdeclarationinstantiation
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VERIFY(environment);
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auto* private_environment = global_object.vm().running_execution_context().private_environment;
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// Note: All the calls here are ! and thus we do not need to TRY this callback.
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for_each_lexically_scoped_declaration([&](Declaration const& declaration) {
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auto is_constant_declaration = declaration.is_constant_declaration();
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declaration.for_each_bound_name([&](auto const& name) {
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@ -4385,150 +4405,196 @@ void ScopeNode::block_declaration_instantiation(GlobalObject& global_object, Env
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// 16.1.7 GlobalDeclarationInstantiation ( script, env ), https://tc39.es/ecma262/#sec-globaldeclarationinstantiation
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ThrowCompletionOr<void> Program::global_declaration_instantiation(Interpreter& interpreter, GlobalObject& global_object, GlobalEnvironment& global_environment) const
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{
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for_each_lexically_declared_name([&](FlyString const& name) {
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if (global_environment.has_var_declaration(name) || global_environment.has_lexical_declaration(name)) {
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interpreter.vm().throw_exception<SyntaxError>(global_object, ErrorType::TopLevelVariableAlreadyDeclared, name);
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return IterationDecision::Break;
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}
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// 1. Let lexNames be the LexicallyDeclaredNames of script.
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// 2. Let varNames be the VarDeclaredNames of script.
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// 3. For each element name of lexNames, do
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TRY(for_each_lexically_declared_name([&](FlyString const& name) -> ThrowCompletionOr<void> {
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// a. If env.HasVarDeclaration(name) is true, throw a SyntaxError exception.
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if (global_environment.has_var_declaration(name))
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return interpreter.vm().throw_completion<SyntaxError>(global_object, ErrorType::TopLevelVariableAlreadyDeclared, name);
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auto restricted_global_or_error = global_environment.has_restricted_global_property(name);
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if (restricted_global_or_error.is_error())
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return IterationDecision::Break;
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auto restricted_global = restricted_global_or_error.release_value();
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// b. If env.HasLexicalDeclaration(name) is true, throw a SyntaxError exception.
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if (global_environment.has_lexical_declaration(name))
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return interpreter.vm().throw_completion<SyntaxError>(global_object, ErrorType::TopLevelVariableAlreadyDeclared, name);
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if (restricted_global)
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interpreter.vm().throw_exception<SyntaxError>(global_object, ErrorType::RestrictedGlobalProperty, name);
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// c. Let hasRestrictedGlobal be ? env.HasRestrictedGlobalProperty(name).
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auto has_restricted_global = TRY(global_environment.has_restricted_global_property(name));
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return IterationDecision::Continue;
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});
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// d. If hasRestrictedGlobal is true, throw a SyntaxError exception.
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if (has_restricted_global)
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return interpreter.vm().throw_completion<SyntaxError>(global_object, ErrorType::RestrictedGlobalProperty, name);
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if (auto* exception = interpreter.exception())
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return throw_completion(exception->value());
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return {};
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}));
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for_each_var_declared_name([&](auto const& name) {
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if (global_environment.has_lexical_declaration(name)) {
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interpreter.vm().throw_exception<SyntaxError>(global_object, ErrorType::TopLevelVariableAlreadyDeclared, name);
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return IterationDecision::Break;
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}
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// 4. For each element name of varNames, do
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TRY(for_each_var_declared_name([&](auto const& name) -> ThrowCompletionOr<void> {
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// a. If env.HasLexicalDeclaration(name) is true, throw a SyntaxError exception.
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if (global_environment.has_lexical_declaration(name))
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return interpreter.vm().throw_completion<SyntaxError>(global_object, ErrorType::TopLevelVariableAlreadyDeclared, name);
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return IterationDecision::Continue;
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});
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return {};
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}));
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if (auto* exception = interpreter.exception())
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return throw_completion(exception->value());
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HashTable<FlyString> declared_function_names;
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// 5. Let varDeclarations be the VarScopedDeclarations of script.
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// 6. Let functionsToInitialize be a new empty List.
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Vector<FunctionDeclaration const&> functions_to_initialize;
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for_each_var_function_declaration_in_reverse_order([&](FunctionDeclaration const& function) {
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// 7. Let declaredFunctionNames be a new empty List.
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HashTable<FlyString> declared_function_names;
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// 8. For each element d of varDeclarations, in reverse List order, do
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TRY(for_each_var_function_declaration_in_reverse_order([&](FunctionDeclaration const& function) -> ThrowCompletionOr<void> {
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// a. If d is neither a VariableDeclaration nor a ForBinding nor a BindingIdentifier, then
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// i. Assert: d is either a FunctionDeclaration, a GeneratorDeclaration, an AsyncFunctionDeclaration, or an AsyncGeneratorDeclaration.
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// Note: This is checked in for_each_var_function_declaration_in_reverse_order.
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// ii. NOTE: If there are multiple function declarations for the same name, the last declaration is used.
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// iii. Let fn be the sole element of the BoundNames of d.
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// iv. If fn is not an element of declaredFunctionNames, then
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if (declared_function_names.set(function.name()) != AK::HashSetResult::InsertedNewEntry)
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return IterationDecision::Continue;
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return {};
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auto function_definable_or_error = global_environment.can_declare_global_function(function.name());
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if (function_definable_or_error.is_error())
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return IterationDecision::Break;
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auto function_definable = function_definable_or_error.release_value();
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// 1. Let fnDefinable be ? env.CanDeclareGlobalFunction(fn).
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auto function_definable = TRY(global_environment.can_declare_global_function(function.name()));
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if (!function_definable) {
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interpreter.vm().throw_exception<TypeError>(global_object, ErrorType::CannotDeclareGlobalFunction, function.name());
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return IterationDecision::Break;
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}
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// 2. If fnDefinable is false, throw a TypeError exception.
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if (!function_definable)
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return interpreter.vm().throw_completion<TypeError>(global_object, ErrorType::CannotDeclareGlobalFunction, function.name());
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// 3. Append fn to declaredFunctionNames.
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// Note: Already done in step iv. above.
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// 4. Insert d as the first element of functionsToInitialize.
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functions_to_initialize.append(function);
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return IterationDecision::Continue;
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});
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if (auto* exception = interpreter.exception())
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return throw_completion(exception->value());
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return {};
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}));
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// 9. Let declaredVarNames be a new empty List.
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HashTable<FlyString> declared_var_names;
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for_each_var_scoped_variable_declaration([&](Declaration const& declaration) {
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declaration.for_each_bound_name([&](auto const& name) {
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// 10. For each element d of varDeclarations, do
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TRY(for_each_var_scoped_variable_declaration([&](Declaration const& declaration) {
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// a. If d is a VariableDeclaration, a ForBinding, or a BindingIdentifier, then
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// Note: This is done in for_each_var_scoped_variable_declaration.
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// i. For each String vn of the BoundNames of d, do
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return declaration.for_each_bound_name([&](auto const& name) -> ThrowCompletionOr<void> {
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// 1. If vn is not an element of declaredFunctionNames, then
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if (declared_function_names.contains(name))
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return IterationDecision::Continue;
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return {};
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auto var_definable_or_error = global_environment.can_declare_global_var(name);
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if (var_definable_or_error.is_error())
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return IterationDecision::Break;
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auto var_definable = var_definable_or_error.release_value();
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// a. Let vnDefinable be ? env.CanDeclareGlobalVar(vn).
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auto var_definable = TRY(global_environment.can_declare_global_var(name));
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if (!var_definable) {
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interpreter.vm().throw_exception<TypeError>(global_object, ErrorType::CannotDeclareGlobalVariable, name);
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return IterationDecision::Break;
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}
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// b. If vnDefinable is false, throw a TypeError exception.
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if (!var_definable)
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return interpreter.vm().throw_completion<TypeError>(global_object, ErrorType::CannotDeclareGlobalVariable, name);
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// c. If vn is not an element of declaredVarNames, then
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// i. Append vn to declaredVarNames.
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declared_var_names.set(name);
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return IterationDecision::Continue;
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return {};
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});
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if (interpreter.exception())
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return IterationDecision::Break;
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return IterationDecision::Continue;
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});
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}));
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if (auto* exception = interpreter.exception())
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return throw_completion(exception->value());
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// 11. NOTE: No abnormal terminations occur after this algorithm step if the global object is an ordinary object. However, if the global object is a Proxy exotic object it may exhibit behaviours that cause abnormal terminations in some of the following steps.
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// 12. NOTE: Annex B.3.2.2 adds additional steps at this point.
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// 12. Let strict be IsStrict of script.
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// 13. If strict is false, then
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if (!m_is_strict_mode) {
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for_each_function_hoistable_with_annexB_extension([&](FunctionDeclaration& function_declaration) {
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// a. Let declaredFunctionOrVarNames be the list-concatenation of declaredFunctionNames and declaredVarNames.
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// b. For each FunctionDeclaration f that is directly contained in the StatementList of a Block, CaseClause, or DefaultClause Contained within script, do
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TRY(for_each_function_hoistable_with_annexB_extension([&](FunctionDeclaration& function_declaration) -> ThrowCompletionOr<void> {
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// i. Let F be StringValue of the BindingIdentifier of f.
|
||||
auto& function_name = function_declaration.name();
|
||||
|
||||
// ii. If replacing the FunctionDeclaration f with a VariableStatement that has F as a BindingIdentifier would not produce any Early Errors for script, then
|
||||
// Note: This step is already performed during parsing and for_each_function_hoistable_with_annexB_extension so this always passes here.
|
||||
|
||||
// 1. If env.HasLexicalDeclaration(F) is false, then
|
||||
if (global_environment.has_lexical_declaration(function_name))
|
||||
return IterationDecision::Continue;
|
||||
return {};
|
||||
|
||||
auto function_definable_or_error = global_environment.can_declare_global_function(function_name);
|
||||
if (function_definable_or_error.is_error())
|
||||
return IterationDecision::Break;
|
||||
auto function_definable = function_definable_or_error.release_value();
|
||||
// a. Let fnDefinable be ? env.CanDeclareGlobalVar(F).
|
||||
auto function_definable = TRY(global_environment.can_declare_global_function(function_name));
|
||||
// b. If fnDefinable is true, then
|
||||
|
||||
if (!function_definable) {
|
||||
interpreter.vm().throw_exception<TypeError>(global_object, ErrorType::CannotDeclareGlobalFunction, function_name);
|
||||
return IterationDecision::Break;
|
||||
}
|
||||
if (!function_definable)
|
||||
return {};
|
||||
|
||||
// i. NOTE: A var binding for F is only instantiated here if it is neither a VarDeclaredName nor the name of another FunctionDeclaration.
|
||||
|
||||
// ii. If declaredFunctionOrVarNames does not contain F, then
|
||||
|
||||
if (!declared_function_names.contains(function_name) && !declared_var_names.contains(function_name)) {
|
||||
auto result = global_environment.create_global_var_binding(function_name, false);
|
||||
if (result.is_error())
|
||||
return IterationDecision::Break;
|
||||
// i. Perform ? env.CreateGlobalVarBinding(F, false).
|
||||
TRY(global_environment.create_global_var_binding(function_name, false));
|
||||
|
||||
// ii. Append F to declaredFunctionOrVarNames.
|
||||
declared_function_names.set(function_name);
|
||||
}
|
||||
|
||||
// iii. When the FunctionDeclaration f is evaluated, perform the following steps in place of the FunctionDeclaration Evaluation algorithm provided in 15.2.6:
|
||||
// i. Let genv be the running execution context's VariableEnvironment.
|
||||
// ii. Let benv be the running execution context's LexicalEnvironment.
|
||||
// iii. Let fobj be ! benv.GetBindingValue(F, false).
|
||||
// iv. Perform ? genv.SetMutableBinding(F, fobj, false).
|
||||
// v. Return NormalCompletion(empty).
|
||||
function_declaration.set_should_do_additional_annexB_steps();
|
||||
|
||||
return IterationDecision::Continue;
|
||||
});
|
||||
|
||||
if (auto* exception = interpreter.exception())
|
||||
return throw_completion(exception->value());
|
||||
return {};
|
||||
}));
|
||||
|
||||
// We should not use declared function names below here anymore since these functions are not in there in the spec.
|
||||
declared_function_names.clear();
|
||||
}
|
||||
|
||||
// 13. Let lexDeclarations be the LexicallyScopedDeclarations of script.
|
||||
// 14. Let privateEnv be null.
|
||||
PrivateEnvironment* private_environment = nullptr;
|
||||
|
||||
for_each_lexically_scoped_declaration([&](Declaration const& declaration) {
|
||||
declaration.for_each_bound_name([&](auto const& name) {
|
||||
if (declaration.is_constant_declaration())
|
||||
(void)global_environment.create_immutable_binding(global_object, name, true);
|
||||
else
|
||||
(void)global_environment.create_mutable_binding(global_object, name, false);
|
||||
if (interpreter.exception())
|
||||
return IterationDecision::Break;
|
||||
return IterationDecision::Continue;
|
||||
});
|
||||
if (interpreter.exception())
|
||||
return IterationDecision::Break;
|
||||
return IterationDecision::Continue;
|
||||
});
|
||||
// 15. For each element d of lexDeclarations, do
|
||||
TRY(for_each_lexically_scoped_declaration([&](Declaration const& declaration) {
|
||||
// a. NOTE: Lexically declared names are only instantiated here but not initialized.
|
||||
// b. For each element dn of the BoundNames of d, do
|
||||
return declaration.for_each_bound_name([&](auto const& name) -> ThrowCompletionOr<void> {
|
||||
// i. If IsConstantDeclaration of d is true, then
|
||||
if (declaration.is_constant_declaration()) {
|
||||
// 1. Perform ? env.CreateImmutableBinding(dn, true).
|
||||
TRY(global_environment.create_immutable_binding(global_object, name, true));
|
||||
}
|
||||
// ii. Else,
|
||||
else {
|
||||
// 1. Perform ? env.CreateMutableBinding(dn, false).
|
||||
TRY(global_environment.create_mutable_binding(global_object, name, false));
|
||||
}
|
||||
|
||||
return {};
|
||||
});
|
||||
}));
|
||||
|
||||
// 16. For each Parse Node f of functionsToInitialize, do
|
||||
for (auto& declaration : functions_to_initialize) {
|
||||
// a. Let fn be the sole element of the BoundNames of f.
|
||||
// b. Let fo be InstantiateFunctionObject of f with arguments env and privateEnv.
|
||||
auto* function = ECMAScriptFunctionObject::create(global_object, declaration.name(), declaration.source_text(), declaration.body(), declaration.parameters(), declaration.function_length(), &global_environment, private_environment, declaration.kind(), declaration.is_strict_mode(), declaration.might_need_arguments_object(), declaration.contains_direct_call_to_eval());
|
||||
|
||||
// c. Perform ? env.CreateGlobalFunctionBinding(fn, fo, false).
|
||||
TRY(global_environment.create_global_function_binding(declaration.name(), function, false));
|
||||
}
|
||||
|
||||
for (auto& var_name : declared_var_names)
|
||||
// 17. For each String vn of declaredVarNames, do
|
||||
for (auto& var_name : declared_var_names) {
|
||||
// a. Perform ? env.CreateGlobalVarBinding(vn, false).
|
||||
TRY(global_environment.create_global_var_binding(var_name, false));
|
||||
}
|
||||
|
||||
// 18. Return NormalCompletion(empty).
|
||||
return {};
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue