1 /* 2 * Copyright (c) 2021 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_FREE_OBJECT_H 17 #define ECMASCRIPT_FREE_OBJECT_H 18 19 #include "ecmascript/js_hclass.h" 20 #include "ecmascript/mem/barriers.h" 21 #include "ecmascript/mem/tagged_object-inl.h" 22 23 namespace panda::ecmascript { 24 class FreeObject : public TaggedObject { 25 public: Cast(uintptr_t object)26 static FreeObject *Cast(uintptr_t object) 27 { 28 return reinterpret_cast<FreeObject *>(object); 29 } 30 static FreeObject *FillFreeObject(EcmaVM *vm, uintptr_t address, size_t size); 31 IsEmpty()32 inline bool IsEmpty() const 33 { 34 return Available() == 0; 35 } 36 GetBegin()37 inline uintptr_t GetBegin() const 38 { 39 return reinterpret_cast<uintptr_t>(this); 40 } 41 GetEnd()42 inline uintptr_t GetEnd() const 43 { 44 return reinterpret_cast<uintptr_t>(this) + Available(); 45 } 46 SetAvailable(uint32_t size)47 inline void SetAvailable(uint32_t size) 48 { 49 if (size >= SIZE) { 50 SetSize(JSTaggedValue(size)); 51 } 52 } 53 Available()54 inline uint32_t Available() const 55 { 56 auto hclass = GetClass(); 57 if (hclass->IsFreeObjectWithShortField()) { 58 return hclass->GetObjectSize(); 59 } 60 ASSERT(GetSize().IsInt()); 61 return GetSize().GetInt(); 62 } 63 IsFreeObject()64 inline bool IsFreeObject() const 65 { 66 return GetClass()->IsFreeObject(); 67 } 68 69 static constexpr size_t NEXT_OFFSET = TaggedObjectSize(); 70 ACCESSORS_FIXED_SIZE_FIELD(Next, FreeObject *, JSTaggedType, NEXT_OFFSET, SIZE_OFFSET) 71 // TaggedArray visitor may be error while concurrent marking 72 ACCESSORS(Size, SIZE_OFFSET, SIZE) 73 }; 74 75 static_assert((FreeObject::SIZE % static_cast<uint8_t>(MemAlignment::MEM_ALIGN_OBJECT)) == 0); 76 } // namespace panda::ecmascript 77 78 #endif // ECMASCRIPT_MEM_FREE_OBJECT_H 79