1 /* 2 * Copyright (c) 2021-2024 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 #ifndef ECMASCRIPT_TAGGED_OBJECT_HEADER_H 17 #define ECMASCRIPT_TAGGED_OBJECT_HEADER_H 18 19 #include "ecmascript/mem/mark_word.h" 20 21 namespace panda::ecmascript { 22 class JSHClass; 23 template<typename T> 24 class JSHandle; 25 class JSThread; 26 27 class TaggedObject { 28 public: Cast(TaggedObject * header)29 static TaggedObject *Cast(TaggedObject *header) 30 { 31 return static_cast<TaggedObject *>(header); 32 } TaggedObject()33 TaggedObject(): class_(0) {} 34 35 void SynchronizedSetClass(const JSThread *thread, JSHClass *hclass); 36 JSHClass *SynchronizedGetClass() const; 37 void SetClassWithoutBarrier(JSHClass *hclass); 38 GetClass()39 JSHClass *GetClass() const 40 { 41 return reinterpret_cast<JSHClass *>(class_); 42 } 43 44 // Size of object header TaggedObjectSize()45 static constexpr size_t TaggedObjectSize() 46 { 47 return sizeof(TaggedObject); 48 } 49 50 static constexpr int HCLASS_OFFSET = 0; 51 static constexpr int SIZE = sizeof(MarkWordType); 52 53 private: 54 void SetClass(const JSThread *thread, JSHClass *hclass); 55 void SetClass(const JSThread *thread, JSHandle<JSHClass> hclass); 56 57 MarkWordType class_; 58 59 friend class BaseHeap; 60 friend class Heap; 61 friend class SharedHeap; 62 friend class ObjectFactory; 63 friend class EcmaString; 64 }; 65 static_assert(TaggedObject::TaggedObjectSize() == sizeof(MarkWordType)); 66 } // namespace panda::ecmascript 67 68 #endif // ECMASCRIPT_TAGGED_OBJECT_HEADER_H 69