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LibJS: Convert create_immutable_binding() to ThrowCompletionOr

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Also add spec step comments to it while we're here.
This commit is contained in:
Linus Groh 2021-10-09 19:00:06 +01:00
parent 4baf3a91e8
commit 2691c65639
10 changed files with 29 additions and 22 deletions
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2
Userland/Libraries/LibJS/Runtime/AbstractOperations.cpp
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@ -678,7 +678,7 @@ ThrowCompletionOr<void> eval_declaration_instantiation(VM& vm, GlobalObject& glo
program.for_each_lexically_scoped_declaration([&](Declaration const& declaration) {
declaration.for_each_bound_name([&](auto const& name) {
if (declaration.is_constant_declaration())
lexical_environment->create_immutable_binding(global_object, name, true);
(void)lexical_environment->create_immutable_binding(global_object, name, true);
else
(void)lexical_environment->create_mutable_binding(global_object, name, false);
if (vm.exception())

8
Userland/Libraries/LibJS/Runtime/DeclarativeEnvironment.cpp
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@ -66,8 +66,9 @@ ThrowCompletionOr<void> DeclarativeEnvironment::create_mutable_binding(GlobalObj
}
// 9.1.1.1.3 CreateImmutableBinding ( N, S ), https://tc39.es/ecma262/#sec-declarative-environment-records-createimmutablebinding-n-s
void DeclarativeEnvironment::create_immutable_binding(GlobalObject&, FlyString const& name, bool strict)
ThrowCompletionOr<void> DeclarativeEnvironment::create_immutable_binding(GlobalObject&, FlyString const& name, bool strict)
{
// 2. Create an immutable binding in envRec for N and record that it is uninitialized. If S is true, record that the newly created binding is a strict binding.
m_bindings.append(Binding {
.value = {},
.strict = strict,
@ -76,7 +77,12 @@ void DeclarativeEnvironment::create_immutable_binding(GlobalObject&, FlyString c
.initialized = false,
});
auto result = m_names.set(name, m_bindings.size() - 1);
// 1. Assert: envRec does not already have a binding for N.
VERIFY(result == AK::HashSetResult::InsertedNewEntry);
// 3. Return NormalCompletion(empty).
return {};
}
// 9.1.1.1.4 InitializeBinding ( N, V ), https://tc39.es/ecma262/#sec-declarative-environment-records-initializebinding-n-v

2
Userland/Libraries/LibJS/Runtime/DeclarativeEnvironment.h
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@ -24,7 +24,7 @@ public:
virtual ThrowCompletionOr<bool> has_binding(FlyString const& name, Optional<size_t>* = nullptr) const override;
virtual ThrowCompletionOr<void> create_mutable_binding(GlobalObject&, FlyString const& name, bool can_be_deleted) override;
virtual void create_immutable_binding(GlobalObject&, FlyString const& name, bool strict) override;
virtual ThrowCompletionOr<void> create_immutable_binding(GlobalObject&, FlyString const& name, bool strict) override;
virtual void initialize_binding(GlobalObject&, FlyString const& name, Value) override;
virtual void set_mutable_binding(GlobalObject&, FlyString const& name, Value, bool strict) override;
virtual Value get_binding_value(GlobalObject&, FlyString const& name, bool strict) override;

4
Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp
View file

@ -374,7 +374,7 @@ ThrowCompletionOr<void> ECMAScriptFunctionObject::function_declaration_instantia
arguments_object = create_mapped_arguments_object(global_object(), *this, formal_parameters(), vm.running_execution_context().arguments, *environment);
if (is_strict_mode())
environment->create_immutable_binding(global_object(), vm.names.arguments.as_string(), false);
MUST(environment->create_immutable_binding(global_object(), vm.names.arguments.as_string(), false));
else
MUST(environment->create_mutable_binding(global_object(), vm.names.arguments.as_string(), false));
@ -524,7 +524,7 @@ ThrowCompletionOr<void> ECMAScriptFunctionObject::function_declaration_instantia
scope_body->for_each_lexically_scoped_declaration([&](Declaration const& declaration) {
declaration.for_each_bound_name([&](auto const& name) {
if (declaration.is_constant_declaration())
lex_environment->create_immutable_binding(global_object(), name, true);
MUST(lex_environment->create_immutable_binding(global_object(), name, true));
else
MUST(lex_environment->create_mutable_binding(global_object(), name, false));
return IterationDecision::Continue;

2
Userland/Libraries/LibJS/Runtime/Environment.h
View file

@ -35,7 +35,7 @@ public:
virtual ThrowCompletionOr<bool> has_binding([[maybe_unused]] FlyString const& name, [[maybe_unused]] Optional<size_t>* out_index = nullptr) const { return false; }
virtual ThrowCompletionOr<void> create_mutable_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, [[maybe_unused]] bool can_be_deleted) { return {}; }
virtual void create_immutable_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, [[maybe_unused]] bool strict) { }
virtual ThrowCompletionOr<void> create_immutable_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, [[maybe_unused]] bool strict) { return {}; }
virtual void initialize_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, Value) { }
virtual void set_mutable_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, Value, [[maybe_unused]] bool strict) { }
virtual Value get_binding_value(GlobalObject&, [[maybe_unused]] FlyString const& name, [[maybe_unused]] bool strict) { return {}; }

14
Userland/Libraries/LibJS/Runtime/GlobalEnvironment.cpp
View file

@ -64,13 +64,15 @@ ThrowCompletionOr<void> GlobalEnvironment::create_mutable_binding(GlobalObject&
}
// 9.1.1.4.3 CreateImmutableBinding ( N, S ), https://tc39.es/ecma262/#sec-global-environment-records-createimmutablebinding-n-s
void GlobalEnvironment::create_immutable_binding(GlobalObject& global_object, FlyString const& name, bool strict)
ThrowCompletionOr<void> GlobalEnvironment::create_immutable_binding(GlobalObject& global_object, FlyString const& name, bool strict)
{
if (MUST(m_declarative_record->has_binding(name))) {
global_object.vm().throw_exception<TypeError>(global_object, ErrorType::FixmeAddAnErrorString);
return;
}
m_declarative_record->create_immutable_binding(global_object, name, strict);
// 1. Let DclRec be envRec.[[DeclarativeRecord]].
// 2. If DclRec.HasBinding(N) is true, throw a TypeError exception.
if (MUST(m_declarative_record->has_binding(name)))
return vm().throw_completion<TypeError>(global_object, ErrorType::FixmeAddAnErrorString);
// 3. Return DclRec.CreateImmutableBinding(N, S).
return m_declarative_record->create_immutable_binding(global_object, name, strict);
}
// 9.1.1.4.4 InitializeBinding ( N, V ), https://tc39.es/ecma262/#sec-global-environment-records-initializebinding-n-v

2
Userland/Libraries/LibJS/Runtime/GlobalEnvironment.h
View file

@ -21,7 +21,7 @@ public:
virtual ThrowCompletionOr<bool> has_binding(FlyString const& name, Optional<size_t>* = nullptr) const override;
virtual ThrowCompletionOr<void> create_mutable_binding(GlobalObject&, FlyString const& name, bool can_be_deleted) override;
virtual void create_immutable_binding(GlobalObject&, FlyString const& name, bool strict) override;
virtual ThrowCompletionOr<void> create_immutable_binding(GlobalObject&, FlyString const& name, bool strict) override;
virtual void initialize_binding(GlobalObject&, FlyString const& name, Value) override;
virtual void set_mutable_binding(GlobalObject&, FlyString const& name, Value, bool strict) override;
virtual Value get_binding_value(GlobalObject&, FlyString const& name, bool strict) override;

2
Userland/Libraries/LibJS/Runtime/ObjectEnvironment.cpp
View file

@ -69,7 +69,7 @@ ThrowCompletionOr<void> ObjectEnvironment::create_mutable_binding(GlobalObject&,
}
// 9.1.1.2.3 CreateImmutableBinding ( N, S ), https://tc39.es/ecma262/#sec-object-environment-records-createimmutablebinding-n-s
void ObjectEnvironment::create_immutable_binding(GlobalObject&, FlyString const&, bool)
ThrowCompletionOr<void> ObjectEnvironment::create_immutable_binding(GlobalObject&, FlyString const&, bool)
{
// "The CreateImmutableBinding concrete method of an object Environment Record is never used within this specification."
VERIFY_NOT_REACHED();

2
Userland/Libraries/LibJS/Runtime/ObjectEnvironment.h
View file

@ -22,7 +22,7 @@ public:
virtual ThrowCompletionOr<bool> has_binding(FlyString const& name, Optional<size_t>* = nullptr) const override;
virtual ThrowCompletionOr<void> create_mutable_binding(GlobalObject&, FlyString const& name, bool can_be_deleted) override;
virtual void create_immutable_binding(GlobalObject&, FlyString const& name, bool strict) override;
virtual ThrowCompletionOr<void> create_immutable_binding(GlobalObject&, FlyString const& name, bool strict) override;
virtual void initialize_binding(GlobalObject&, FlyString const& name, Value) override;
virtual void set_mutable_binding(GlobalObject&, FlyString const& name, Value, bool strict) override;
virtual Value get_binding_value(GlobalObject&, FlyString const& name, bool strict) override;