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LibJS: Throw if the trap result of OwnPropertyKeys contains duplicates

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Idan Horowitz 2021-07-06 23:53:34 +03:00 • committed by Linus Groh
parent d577678658
commit dd27490ee1
4 changed files with 21 additions and 11 deletions
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8
Userland/Libraries/LibJS/Runtime/AbstractOperations.cpp
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@ -57,7 +57,7 @@ size_t length_of_array_like(GlobalObject& global_object, Object const& object)
}
// 7.3.19 CreateListFromArrayLike ( obj [ , elementTypes ] ), https://tc39.es/ecma262/#sec-createlistfromarraylike
MarkedValueList create_list_from_array_like(GlobalObject& global_object, Value value, Function<Result<void, ErrorType>(Value)> check_value)
MarkedValueList create_list_from_array_like(GlobalObject& global_object, Value value, Function<void(Value)> check_value)
{
auto& vm = global_object.vm();
auto& heap = global_object.heap();
@ -76,12 +76,10 @@ MarkedValueList create_list_from_array_like(GlobalObject& global_object, Value v
if (vm.exception())
return MarkedValueList { heap };
if (check_value) {
auto result = check_value(next);
if (result.is_error()) {
vm.throw_exception<TypeError>(global_object, result.release_error());
check_value(next);
if (vm.exception())
return MarkedValueList { heap };
}
}
list.append(next);
}
return list;

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

@ -21,7 +21,7 @@ Object* get_super_constructor(VM&);
Reference make_super_property_reference(GlobalObject&, Value actual_this, StringOrSymbol const& property_key, bool strict);
Value require_object_coercible(GlobalObject&, Value);
size_t length_of_array_like(GlobalObject&, Object const&);
MarkedValueList create_list_from_array_like(GlobalObject&, Value, Function<Result<void, ErrorType>(Value)> = {});
MarkedValueList create_list_from_array_like(GlobalObject&, Value, Function<void(Value)> = {});
FunctionObject* species_constructor(GlobalObject&, Object const&, FunctionObject& default_constructor);
GlobalObject* get_function_realm(GlobalObject&, FunctionObject const&);
bool is_compatible_property_descriptor(bool extensible, PropertyDescriptor const&, Optional<PropertyDescriptor> const& current);

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

@ -132,6 +132,8 @@
"return value must match the target's extensibility") \
M(ProxyOwnPropertyKeysNotStringOrSymbol, "Proxy handler's ownKeys trap violates invariant: " \
"the type of each result list element is either String or Symbol") \
M(ProxyOwnPropertyKeysDuplicates, "Proxy handler's ownKeys trap violates invariant: " \
"the result list may not contain duplicate elements") \
M(ProxyPreventExtensionsReturn, "Proxy handler's preventExtensions trap violates " \
"invariant: cannot return true if the target object is extensible") \
M(ProxyRevoked, "An operation was performed on a revoked Proxy object") \

20
Userland/Libraries/LibJS/Runtime/ProxyObject.cpp
View file

@ -798,13 +798,23 @@ MarkedValueList ProxyObject::internal_own_property_keys() const
return MarkedValueList { heap() };
// 8. Let trapResult be ? CreateListFromArrayLike(trapResultArray, « String, Symbol »).
auto trap_result = create_list_from_array_like(global_object, trap_result_array, [](auto value) -> Result<void, ErrorType> {
if (!value.is_string() && !value.is_symbol())
return ErrorType::ProxyOwnPropertyKeysNotStringOrSymbol;
return {};
HashTable<StringOrSymbol> unique_keys;
auto trap_result = create_list_from_array_like(global_object, trap_result_array, [&](auto value) {
auto& vm = global_object.vm();
if (!value.is_string() && !value.is_symbol()) {
vm.throw_exception<TypeError>(global_object, ErrorType::ProxyOwnPropertyKeysNotStringOrSymbol);
return;
}
auto property_key = value.to_property_key(global_object);
VERIFY(!vm.exception());
unique_keys.set(property_key, AK::HashSetExistingEntryBehavior::Keep);
});
// FIXME: 9. If trapResult contains any duplicate entries, throw a TypeError exception.
// 9. If trapResult contains any duplicate entries, throw a TypeError exception.
if (unique_keys.size() != trap_result.size()) {
vm.throw_exception<TypeError>(global_object, ErrorType::ProxyOwnPropertyKeysDuplicates);
return MarkedValueList { heap() };
}
// 10. Let extensibleTarget be ? IsExtensible(target).
auto extensible_target = m_target.is_extensible();