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LibJS: Add spec comments to more Reference AOs

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This commit is contained in:
Linus Groh 2022-02-13 14:30:03 +00:00
parent 88e7d44cc4
commit 5e2d059508
Notes: sideshowbarker 2024-07-17 18:55:33 +09:00 
Author: https://github.com/linusg
Commit: https://github.com/SerenityOS/serenity/commit/5e2d059508
1 changed files with 57 additions and 4 deletions
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61
Userland/Libraries/LibJS/Runtime/Reference.cpp
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@ -17,30 +17,55 @@ ThrowCompletionOr<void> Reference::put_value(GlobalObject& global_object, Value
{
auto& vm = global_object.vm();
// 1. ReturnIfAbrupt(V).
// 2. ReturnIfAbrupt(W).
// 3. If V is not a Reference Record, throw a ReferenceError exception.
if (!is_valid_reference())
return vm.throw_completion<ReferenceError>(global_object, ErrorType::InvalidLeftHandAssignment);
// 4. If IsUnresolvableReference(V) is true, then
if (is_unresolvable()) {
// a. If V.[[Strict]] is true, throw a ReferenceError exception.
if (m_strict)
return throw_reference_error(global_object);
// b. Let globalObj be GetGlobalObject().
// c. Return ? Set(globalObj, V.[[ReferencedName]], W, false).
TRY(global_object.set(m_name, value, Object::ShouldThrowExceptions::No));
return {};
}
// 5. If IsPropertyReference(V) is true, then
if (is_property_reference()) {
// a. Let baseObj be ? ToObject(V.[[Base]]).
auto* base_obj = TRY(m_base_value.to_object(global_object));
if (is_private_reference())
// b. If IsPrivateReference(V) is true, then
if (is_private_reference()) {
// i. Return ? PrivateSet(baseObj, V.[[ReferencedName]], W).
return base_obj->private_set(m_private_name, value);
}
// c. Let succeeded be ? baseObj.[[Set]](V.[[ReferencedName]], W, GetThisValue(V)).
auto succeeded = TRY(base_obj->internal_set(m_name, value, get_this_value()));
// d. If succeeded is false and V.[[Strict]] is true, throw a TypeError exception.
if (!succeeded && m_strict)
return vm.throw_completion<TypeError>(global_object, ErrorType::ReferenceNullishSetProperty, m_name, m_base_value.to_string_without_side_effects());
// e. Return.
return {};
}
// 6. Else,
// a. Let base be V.[[Base]].
// b. Assert: base is an Environment Record.
VERIFY(m_base_type == BaseType::Environment);
VERIFY(m_base_environment);
// c. Return ? base.SetMutableBinding(V.[[ReferencedName]], W, V.[[Strict]]) (see 9.1).
if (m_environment_coordinate.has_value())
return static_cast<DeclarativeEnvironment*>(m_base_environment)->set_mutable_binding_direct(global_object, m_environment_coordinate->index, value, m_strict);
else
@ -59,18 +84,32 @@ Completion Reference::throw_reference_error(GlobalObject& global_object) const
// 6.2.4.5 GetValue ( V ), https://tc39.es/ecma262/#sec-getvalue
ThrowCompletionOr<Value> Reference::get_value(GlobalObject& global_object) const
{
// 1. ReturnIfAbrupt(V).
// 2. If V is not a Reference Record, return V.
// 3. If IsUnresolvableReference(V) is true, throw a ReferenceError exception.
if (!is_valid_reference() || is_unresolvable())
return throw_reference_error(global_object);
// 4. If IsPropertyReference(V) is true, then
if (is_property_reference()) {
// a. Let baseObj be ? ToObject(V.[[Base]]).
// NOTE: Deferred as an optimization; we might not actually need to create an object.
// b. If IsPrivateReference(V) is true, then
if (is_private_reference()) {
// FIXME: We need to be able to specify the receiver for this
// if we want to use it in error messages in future
// as things currently stand this does the "wrong thing" but
// the error is unobservable
auto base_obj = TRY(m_base_value.to_object(global_object));
auto* base_obj = TRY(m_base_value.to_object(global_object));
// i. Return ? PrivateGet(baseObj, V.[[ReferencedName]]).
return base_obj->private_get(m_private_name);
}
// OPTIMIZATION: For various primitives we can avoid actually creating a new object for them.
Object* base_obj = nullptr;
if (m_base_value.is_string()) {
auto string_value = m_base_value.as_string().get(global_object, m_name);
@ -84,12 +123,18 @@ ThrowCompletionOr<Value> Reference::get_value(GlobalObject& global_object) const
else
base_obj = TRY(m_base_value.to_object(global_object));
// c. Return ? baseObj.[[Get]](V.[[ReferencedName]], GetThisValue(V)).
return base_obj->internal_get(m_name, m_base_value);
}
VERIFY(m_base_type == BaseType::Environment);
// 5. Else,
// a. Let base be V.[[Base]].
// b. Assert: base is an Environment Record.
VERIFY(m_base_type == BaseType::Environment);
VERIFY(m_base_environment);
// c. Return ? base.GetBindingValue(V.[[ReferencedName]], V.[[Strict]]) (see 9.1).
if (m_environment_coordinate.has_value())
return static_cast<DeclarativeEnvironment*>(m_base_environment)->get_binding_value_direct(global_object, m_environment_coordinate->index, m_strict);
return m_base_environment->get_binding_value(global_object, m_name.as_string(), m_strict);
@ -188,9 +233,17 @@ String Reference::to_string() const
// 6.2.4.9 MakePrivateReference ( baseValue, privateIdentifier ), https://tc39.es/ecma262/#sec-makeprivatereference
Reference make_private_reference(VM& vm, Value base_value, FlyString const& private_identifier)
{
// 1. Let privEnv be the running execution context's PrivateEnvironment.
auto* private_environment = vm.running_execution_context().private_environment;
// 2. Assert: privEnv is not null.
VERIFY(private_environment);
return Reference { base_value, private_environment->resolve_private_identifier(private_identifier) };
// 3. Let privateName be ! ResolvePrivateIdentifier(privEnv, privateIdentifier).
auto private_name = private_environment->resolve_private_identifier(private_identifier);
// 4. Return the Reference Record { [[Base]]: baseValue, [[ReferencedName]]: privateName, [[Strict]]: true, [[ThisValue]]: empty }.
return Reference { base_value, private_name };
}
}