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https://github.com/RGBCube/serenity
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b84f8fb55b
Some of these are allocated upon initialization of the intrinsics, and some lazily, but in neither case the getters actually return a nullptr. This saves us a whole bunch of pointer dereferences (as NonnullGCPtr has an `operator T&()`), and also has the interesting side effect of forcing us to explicitly use the FunctionObject& overload of call(), as passing a NonnullGCPtr is ambigous - it could implicitly be turned into a Value _or_ a FunctionObject& (so we have to dereference manually).
62 lines
2.3 KiB
C++
62 lines
2.3 KiB
C++
/*
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* Copyright (c) 2021-2022, Idan Horowitz <idan.horowitz@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/AbstractOperations.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/WeakRef.h>
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#include <LibJS/Runtime/WeakRefConstructor.h>
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namespace JS {
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WeakRefConstructor::WeakRefConstructor(Realm& realm)
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: NativeFunction(realm.vm().names.WeakRef.as_string(), realm.intrinsics().function_prototype())
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{
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}
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ThrowCompletionOr<void> WeakRefConstructor::initialize(Realm& realm)
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{
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auto& vm = this->vm();
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MUST_OR_THROW_OOM(NativeFunction::initialize(realm));
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// 26.1.2.1 WeakRef.prototype, https://tc39.es/ecma262/#sec-weak-ref.prototype
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define_direct_property(vm.names.prototype, realm.intrinsics().weak_ref_prototype(), 0);
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define_direct_property(vm.names.length, Value(1), Attribute::Configurable);
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return {};
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}
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// 26.1.1.1 WeakRef ( target ), https://tc39.es/ecma262/#sec-weak-ref-target
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ThrowCompletionOr<Value> WeakRefConstructor::call()
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{
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auto& vm = this->vm();
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// 1. If NewTarget is undefined, throw a TypeError exception.
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return vm.throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, vm.names.WeakRef);
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}
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// 26.1.1.1 WeakRef ( target ), https://tc39.es/ecma262/#sec-weak-ref-target
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ThrowCompletionOr<NonnullGCPtr<Object>> WeakRefConstructor::construct(FunctionObject& new_target)
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{
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auto& vm = this->vm();
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auto target = vm.argument(0);
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// 2. If CanBeHeldWeakly(target) is false, throw a TypeError exception.
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if (!can_be_held_weakly(target))
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return vm.throw_completion<TypeError>(ErrorType::CannotBeHeldWeakly, TRY_OR_THROW_OOM(vm, target.to_string_without_side_effects()));
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// 3. Let weakRef be ? OrdinaryCreateFromConstructor(NewTarget, "%WeakRef.prototype%", « [[WeakRefTarget]] »).
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// 4. Perform AddToKeptObjects(target).
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// 5. Set weakRef.[[WeakRefTarget]] to target.
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// 6. Return weakRef.
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if (target.is_object())
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return TRY(ordinary_create_from_constructor<WeakRef>(vm, new_target, &Intrinsics::weak_ref_prototype, target.as_object()));
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VERIFY(target.is_symbol());
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return TRY(ordinary_create_from_constructor<WeakRef>(vm, new_target, &Intrinsics::weak_ref_prototype, target.as_symbol()));
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}
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}
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