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 #include "ecmascript/mem/shared_heap/shared_value_helper.h" 21 22 namespace panda::ecmascript { 23 class JSHClass; 24 template<typename T> 25 class JSHandle; 26 class JSThread; 27 28 class TaggedObject { 29 public: Cast(TaggedObject * header)30 static TaggedObject *Cast(TaggedObject *header) 31 { 32 return static_cast<TaggedObject *>(header); 33 } TaggedObject()34 TaggedObject(): class_(0) {} 35 36 void SynchronizedSetClass(const JSThread *thread, JSHClass *hclass); 37 JSHClass *SynchronizedGetClass() const; 38 void SetClassWithoutBarrier(JSHClass *hclass); 39 GetClass()40 JSHClass *GetClass() const 41 { 42 return reinterpret_cast<JSHClass *>(class_); 43 } 44 45 // Size of object header TaggedObjectSize()46 static constexpr size_t TaggedObjectSize() 47 { 48 return sizeof(TaggedObject); 49 } 50 51 static constexpr int HCLASS_OFFSET = 0; 52 static constexpr int SIZE = sizeof(MarkWordType); 53 54 private: 55 void SetClass(const JSThread *thread, JSHClass *hclass); 56 void SetClass(const JSThread *thread, JSHandle<JSHClass> hclass); 57 58 MarkWordType class_; 59 60 friend class BaseHeap; 61 friend class Heap; 62 friend class SharedHeap; 63 friend class ObjectFactory; 64 friend class EcmaString; 65 }; 66 static_assert(TaggedObject::TaggedObjectSize() == sizeof(MarkWordType)); 67 } // namespace panda::ecmascript 68 69 #endif // ECMASCRIPT_TAGGED_OBJECT_HEADER_H 70