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_WEAK_VECTOR_H 17 #define ECMASCRIPT_WEAK_VECTOR_H 18 19 #include "ecmascript/js_handle.h" 20 #include "ecmascript/js_thread.h" 21 #include "ecmascript/tagged_array-inl.h" 22 23 namespace panda::ecmascript { 24 class WeakVector : public TaggedArray { 25 public: Cast(TaggedObject * object)26 static WeakVector *Cast(TaggedObject *object) 27 { 28 return static_cast<WeakVector *>(object); 29 } 30 31 static constexpr uint32_t DEFAULT_CAPACITY = 4; 32 static JSHandle<WeakVector> Create(const JSThread *thread, uint32_t capacity = DEFAULT_CAPACITY); 33 static JSHandle<WeakVector> Grow(const JSThread *thread, const JSHandle<WeakVector> &old, uint32_t newCapacity); 34 uint32_t PushBack(const JSThread *thread, JSTaggedValue value); 35 // just set index value to Hole 36 bool Delete(const JSThread *thread, uint32_t index); 37 GetEnd()38 inline uint32_t GetEnd() const 39 { 40 return TaggedArray::Get(END_INDEX).GetArrayLength(); 41 } 42 Full()43 inline bool Full() const 44 { 45 return GetEnd() == GetCapacity(); 46 } 47 Empty()48 inline bool Empty() const 49 { 50 return GetEnd() == 0; 51 } 52 GetCapacity()53 inline uint32_t GetCapacity() const 54 { 55 return TaggedArray::GetLength() - ELEMENTS_START_INDEX; 56 } 57 Get(uint32_t index)58 inline JSTaggedValue Get(uint32_t index) const 59 { 60 ASSERT(index < GetCapacity()); 61 return TaggedArray::Get(VectorToArrayIndex(index)); 62 } 63 Set(const JSThread * thread,uint32_t index,JSTaggedValue value)64 inline void Set(const JSThread *thread, uint32_t index, JSTaggedValue value) 65 { 66 ASSERT(index < GetCapacity()); 67 TaggedArray::Set(thread, VectorToArrayIndex(index), value); 68 } 69 70 private: 71 static const uint32_t MIN_CAPACITY = 2; 72 static const uint32_t END_INDEX = 0; 73 static const uint32_t ELEMENTS_START_INDEX = 1; 74 static const uint32_t MAX_VECTOR_INDEX = TaggedArray::MAX_ARRAY_INDEX - ELEMENTS_START_INDEX; 75 VectorToArrayIndex(uint32_t index)76 inline static constexpr uint32_t VectorToArrayIndex(uint32_t index) 77 { 78 return index + ELEMENTS_START_INDEX; 79 } 80 SetEnd(const JSThread * thread,uint32_t end)81 inline void SetEnd(const JSThread *thread, uint32_t end) 82 { 83 ASSERT(end <= GetCapacity()); 84 TaggedArray::Set(thread, END_INDEX, JSTaggedValue(end)); 85 } 86 }; 87 } // namespace panda::ecmascript 88 #endif // ECMASCRIPT_WEAK_VECTOR_H 89