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LibJS: Add the Object.prototype.__proto__ native accessor property

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This is part of the Annex B extension of the specification.
This commit is contained in:
Idan Horowitz 2021-06-17 14:12:38 +03:00 • committed by Linus Groh
parent d1c109be96
commit 37340aa599
3 changed files with 42 additions and 0 deletions
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1
Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h
View file

@ -12,6 +12,7 @@
namespace JS {
#define ENUMERATE_STANDARD_PROPERTY_NAMES(P) \
P(__proto__) \
P(BYTES_PER_ELEMENT) \
P(BigInt) \
P(Boolean) \

39
Userland/Libraries/LibJS/Runtime/ObjectPrototype.cpp
View file

@ -35,6 +35,9 @@ void ObjectPrototype::initialize(GlobalObject& global_object)
define_native_function(vm.names.valueOf, value_of, 0, attr);
define_native_function(vm.names.propertyIsEnumerable, property_is_enumerable, 1, attr);
define_native_function(vm.names.isPrototypeOf, is_prototype_of, 1, attr);
// Annex B
define_native_accessor(vm.names.__proto__, proto_getter, proto_setter, Attribute::Configurable);
}
ObjectPrototype::~ObjectPrototype()
@ -144,4 +147,40 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::is_prototype_of)
}
}
// B.2.2.1.1 get Object.prototype.__proto__, https://tc39.es/ecma262/#sec-get-object.prototype.__proto__
JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::proto_getter)
{
auto object = vm.this_value(global_object).to_object(global_object);
if (vm.exception())
return {};
auto proto = object->prototype();
if (vm.exception())
return {};
return proto;
}
// B.2.2.1.2 set Object.prototype.__proto__, https://tc39.es/ecma262/#sec-set-object.prototype.__proto__
JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::proto_setter)
{
auto object = require_object_coercible(global_object, vm.this_value(global_object));
if (vm.exception())
return {};
auto proto = vm.argument(0);
if (!proto.is_object() && !proto.is_null())
return js_undefined();
if (!object.is_object())
return js_undefined();
auto status = object.as_object().set_prototype(proto.is_object() ? &proto.as_object() : nullptr);
if (vm.exception())
return {};
if (!status) {
vm.throw_exception<TypeError>(global_object, ErrorType::ObjectSetPrototypeOfReturnedFalse);
return {};
}
return js_undefined();
}
}

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

@ -27,6 +27,8 @@ private:
JS_DECLARE_NATIVE_FUNCTION(value_of);
JS_DECLARE_NATIVE_FUNCTION(property_is_enumerable);
JS_DECLARE_NATIVE_FUNCTION(is_prototype_of);
JS_DECLARE_NATIVE_FUNCTION(proto_getter);
JS_DECLARE_NATIVE_FUNCTION(proto_setter);
};
}