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LibJS: Add the Object.prototype.__proto__ native accessor property
This is part of the Annex B extension of the specification.
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@ -12,6 +12,7 @@
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namespace JS {
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#define ENUMERATE_STANDARD_PROPERTY_NAMES(P) \
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P(__proto__) \
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P(BYTES_PER_ELEMENT) \
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P(BigInt) \
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P(Boolean) \
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@ -35,6 +35,9 @@ void ObjectPrototype::initialize(GlobalObject& global_object)
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define_native_function(vm.names.valueOf, value_of, 0, attr);
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define_native_function(vm.names.propertyIsEnumerable, property_is_enumerable, 1, attr);
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define_native_function(vm.names.isPrototypeOf, is_prototype_of, 1, attr);
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// Annex B
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define_native_accessor(vm.names.__proto__, proto_getter, proto_setter, Attribute::Configurable);
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}
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ObjectPrototype::~ObjectPrototype()
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@ -144,4 +147,40 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::is_prototype_of)
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}
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}
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// B.2.2.1.1 get Object.prototype.__proto__, https://tc39.es/ecma262/#sec-get-object.prototype.__proto__
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JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::proto_getter)
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{
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auto object = vm.this_value(global_object).to_object(global_object);
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if (vm.exception())
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return {};
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auto proto = object->prototype();
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if (vm.exception())
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return {};
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return proto;
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}
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// B.2.2.1.2 set Object.prototype.__proto__, https://tc39.es/ecma262/#sec-set-object.prototype.__proto__
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JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::proto_setter)
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{
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auto object = require_object_coercible(global_object, vm.this_value(global_object));
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if (vm.exception())
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return {};
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auto proto = vm.argument(0);
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if (!proto.is_object() && !proto.is_null())
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return js_undefined();
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if (!object.is_object())
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return js_undefined();
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auto status = object.as_object().set_prototype(proto.is_object() ? &proto.as_object() : nullptr);
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if (vm.exception())
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return {};
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if (!status) {
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vm.throw_exception<TypeError>(global_object, ErrorType::ObjectSetPrototypeOfReturnedFalse);
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return {};
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}
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return js_undefined();
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}
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}
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@ -27,6 +27,8 @@ private:
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JS_DECLARE_NATIVE_FUNCTION(value_of);
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JS_DECLARE_NATIVE_FUNCTION(property_is_enumerable);
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JS_DECLARE_NATIVE_FUNCTION(is_prototype_of);
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JS_DECLARE_NATIVE_FUNCTION(proto_getter);
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JS_DECLARE_NATIVE_FUNCTION(proto_setter);
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};
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}
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