1 /*
2 * Copyright (c) 2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "ecmascript/builtins/builtins_weak_ref.h"
17 #include "ecmascript/js_weak_ref.h"
18
19 namespace panda::ecmascript::builtins {
WeakRefConstructor(EcmaRuntimeCallInfo *argv)20 JSTaggedValue BuiltinsWeakRef::WeakRefConstructor(EcmaRuntimeCallInfo *argv)
21 {
22 ASSERT(argv);
23 JSThread *thread = argv->GetThread();
24 BUILTINS_API_TRACE(thread, WeakRef, Constructor);
25 [[maybe_unused]] EcmaHandleScope handleScope(thread);
26 JSHandle<JSTaggedValue> newTarget = GetNewTarget(argv);
27 ObjectFactory *factory = thread->GetEcmaVM()->GetFactory();
28 // 1. If NewTarget is undefined, throw a TypeError exception.
29 if (newTarget->IsUndefined()) {
30 THROW_TYPE_ERROR_AND_RETURN(thread, "new target can't be undefined", JSTaggedValue::Exception());
31 }
32 // 2. If CanBeHeldWeakly(target) is false, throw a TypeError exception.
33 JSHandle<JSTaggedValue> target = GetCallArg(argv, 0);
34 if (!JSTaggedValue::CanBeHeldWeakly(thread, target)) {
35 THROW_TYPE_ERROR_AND_RETURN(thread, "target invalid", JSTaggedValue::Exception());
36 }
37 // 3. Let weakRef be ? OrdinaryCreateFromConstructor(NewTarget, "%WeakRef.prototype%", « [[WeakRefTarget]] »).
38 JSHandle<JSTaggedValue> constructor = GetConstructor(argv);
39 JSHandle<JSObject> obj = factory->NewJSObjectByConstructor(JSHandle<JSFunction>(constructor), newTarget);
40 RETURN_EXCEPTION_IF_ABRUPT_COMPLETION(thread);
41 // 4. Perform ! AddToKeptObjects(target).
42 thread->GetCurrentEcmaContext()->AddToKeptObjects(target);
43 // 5. Set weakRef.[[WeakRefTarget]] to target.
44 // 6. Return weakRef.
45 JSHandle<JSWeakRef> weakRef = JSHandle<JSWeakRef>::Cast(obj);
46 weakRef->SetToWeak(thread, target.GetTaggedValue());
47 return weakRef.GetTaggedValue();
48 }
49
Deref(EcmaRuntimeCallInfo *argv)50 JSTaggedValue BuiltinsWeakRef::Deref(EcmaRuntimeCallInfo *argv)
51 {
52 ASSERT(argv);
53 JSThread *thread = argv->GetThread();
54 BUILTINS_API_TRACE(thread, WeakRef, Deref);
55 [[maybe_unused]] EcmaHandleScope handleScope(thread);
56 // 1. Let weakRef be the this value.
57 JSHandle<JSTaggedValue> thisValue = GetThis(argv);
58 // 2. Perform ? RequireInternalSlot(weakRef, [[WeakRefTarget]]).
59 if (!thisValue->IsJSWeakRef()) {
60 THROW_TYPE_ERROR_AND_RETURN(thread, "thisValue is not object or does not have an internalSlot internal slot",
61 JSTaggedValue::Exception());
62 }
63 // 3. Return ! WeakRefDeref(weakRef).
64 JSHandle<JSWeakRef> weakRef = JSHandle<JSWeakRef>::Cast(thisValue);
65 return JSWeakRef::WeakRefDeref(thread, weakRef);
66 }
67 } // namespace panda::ecmascript::builtins
68