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d8cf9a50f7
Issue: https://gitee.com/open_harmony/dashboard?issue_id=IACDZP Change-Id: I729c3a2741cb2571d6f7184b2726e5f06eca802a Signed-off-by: Andrey Efremov <efremov.andrey@huawei-partners.com>
70 lines
2.3 KiB
C++
70 lines
2.3 KiB
C++
/*
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* Copyright (c) 2022-2024 Huawei Device Co., Ltd.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ECMASCRIPT_JS_WEAK_REF_H
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#define ECMASCRIPT_JS_WEAK_REF_H
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#include "ecmascript/ecma_context.h"
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#include "ecmascript/js_object.h"
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#include "ecmascript/js_tagged_value-inl.h"
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namespace panda::ecmascript {
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class JSWeakRef : public JSObject {
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public:
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static JSWeakRef *Cast(TaggedObject *object)
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{
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ASSERT(JSTaggedValue(object).IsJSWeakRef());
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return static_cast<JSWeakRef *>(object);
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}
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// 26.1.4.1 WeakRefDeref ( weakRef )
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static JSTaggedValue WeakRefDeref(JSThread *thread, const JSHandle<JSWeakRef> &weakRef)
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{
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// 1. Let target be weakRef.[[WeakRefTarget]].
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// 2. If target is not empty, then
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// a. Perform ! AddToKeptObjects(target).
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// b. Return target.
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// 3. Return undefined.
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JSHandle<JSTaggedValue> target(thread, weakRef->GetFromWeak());
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if (!target->IsUndefined()) {
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thread->GetCurrentEcmaContext()->AddToKeptObjects(target);
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}
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return target.GetTaggedValue();
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}
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void SetToWeak(JSThread *thread, JSTaggedValue value)
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{
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ALLOW_LOCAL_TO_SHARE_WEAK_REF_HANDLE;
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JSTaggedValue weakObj = JSTaggedValue(value.CreateAndGetWeakRef());
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ASSERT(weakObj.IsWeak());
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SetWeakObject(thread, weakObj);
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}
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JSTaggedValue GetFromWeak() const
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{
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JSTaggedValue weakObj = GetWeakObject();
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if (!weakObj.IsUndefined()) {
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return JSTaggedValue(weakObj.GetWeakReferent());
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}
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return weakObj;
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}
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static constexpr size_t WEAK_OBJECT_OFFSET = JSObject::SIZE;
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ACCESSORS(WeakObject, WEAK_OBJECT_OFFSET, SIZE)
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DECL_VISIT_OBJECT_FOR_JS_OBJECT(JSObject, WEAK_OBJECT_OFFSET, SIZE)
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DECL_DUMP()
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};
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} // namespace
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#endif // ECMASCRIPT_JS_WEAK_REF_H
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