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
18 #include "ecmascript/ecma_vm.h"
19 #include "ecmascript/js_weak_ref.h"
20 #include "ecmascript/object_factory.h"
21
22 namespace panda::ecmascript::builtins {
WeakRefConstructor(EcmaRuntimeCallInfo * argv)23 JSTaggedValue BuiltinsWeakRef::WeakRefConstructor(EcmaRuntimeCallInfo *argv)
24 {
25 ASSERT(argv);
26 JSThread *thread = argv->GetThread();
27 BUILTINS_API_TRACE(thread, WeakRef, Constructor);
28 [[maybe_unused]] EcmaHandleScope handleScope(thread);
29 JSHandle<JSTaggedValue> newTarget = GetNewTarget(argv);
30 ObjectFactory *factory = thread->GetEcmaVM()->GetFactory();
31 // 1. If NewTarget is undefined, throw a TypeError exception.
32 if (newTarget->IsUndefined()) {
33 THROW_TYPE_ERROR_AND_RETURN(thread, "new target can't be undefined", JSTaggedValue::Exception());
34 }
35 // 2. If CanBeHeldWeakly(target) is false, throw a TypeError exception.
36 JSHandle<JSTaggedValue> target = GetCallArg(argv, 0);
37 if (!JSTaggedValue::CanBeHeldWeakly(thread, target)) {
38 THROW_TYPE_ERROR_AND_RETURN(thread, "target invalid", JSTaggedValue::Exception());
39 }
40 // 3. Let weakRef be ? OrdinaryCreateFromConstructor(NewTarget, "%WeakRef.prototype%", « [[WeakRefTarget]] »).
41 JSHandle<JSTaggedValue> constructor = GetConstructor(argv);
42 JSHandle<JSObject> obj = factory->NewJSObjectByConstructor(JSHandle<JSFunction>(constructor), newTarget);
43 RETURN_EXCEPTION_IF_ABRUPT_COMPLETION(thread);
44 // 4. Perform ! AddToKeptObjects(target).
45 thread->GetEcmaVM()->GetHeap()->AddToKeptObjects(target);
46 // 5. Set weakRef.[[WeakRefTarget]] to target.
47 // 6. Return weakRef.
48 JSHandle<JSWeakRef> weakRef = JSHandle<JSWeakRef>::Cast(obj);
49 weakRef->SetToWeak(thread, target.GetTaggedValue());
50 return weakRef.GetTaggedValue();
51 }
52
Deref(EcmaRuntimeCallInfo * argv)53 JSTaggedValue BuiltinsWeakRef::Deref(EcmaRuntimeCallInfo *argv)
54 {
55 ASSERT(argv);
56 JSThread *thread = argv->GetThread();
57 BUILTINS_API_TRACE(thread, WeakRef, Deref);
58 [[maybe_unused]] EcmaHandleScope handleScope(thread);
59 // 1. Let weakRef be the this value.
60 JSHandle<JSTaggedValue> thisValue = GetThis(argv);
61 // 2. Perform ? RequireInternalSlot(weakRef, [[WeakRefTarget]]).
62 if (!thisValue->IsJSWeakRef()) {
63 THROW_TYPE_ERROR_AND_RETURN(thread, "thisValue is not object or does not have an internalSlot internal slot",
64 JSTaggedValue::Exception());
65 }
66 // 3. Return ! WeakRefDeref(weakRef).
67 JSHandle<JSWeakRef> weakRef = JSHandle<JSWeakRef>::Cast(thisValue);
68 return JSWeakRef::WeakRefDeref(thread, weakRef);
69 }
70 } // namespace panda::ecmascript::builtins
71