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_BYTE_ARRAY_H 17 #define ECMASCRIPT_BYTE_ARRAY_H 18 19 #include "ecmascript/js_hclass.h" 20 #include "ecmascript/js_tagged_value.h" 21 #include "ecmascript/js_dataview.h" 22 23 namespace panda::ecmascript { 24 class ObjectFactory; 25 class JSThread; 26 27 class ByteArray : public TaggedObject { 28 public: 29 CAST_CHECK(ByteArray, IsByteArray); 30 ComputeSize(size_t elemSize,uint32_t length)31 static inline size_t ComputeSize(size_t elemSize, uint32_t length) 32 { 33 ASSERT(elemSize != 0); 34 size_t size = DATA_OFFSET + elemSize * length; 35 return size; 36 } 37 38 inline void *GetData(uint32_t index = 0) const 39 { 40 return reinterpret_cast<void *>(ToUintPtr(this) + DATA_OFFSET + index * GetByteLength()); 41 } 42 43 void Set(JSThread* thread, uint32_t idx, DataViewType type, JSTaggedType val, uint32_t offset = 0); 44 JSTaggedValue Get(JSThread *thread, uint32_t idx, DataViewType type, uint32_t offset = 0); 45 46 static constexpr size_t ARRAY_LENGTH_OFFSET = TaggedObjectSize(); 47 ACCESSORS_PRIMITIVE_FIELD(ArrayLength, uint32_t, ARRAY_LENGTH_OFFSET, BYTE_LENGTH_OFFSET) 48 ACCESSORS_PRIMITIVE_FIELD(ByteLength, uint32_t, BYTE_LENGTH_OFFSET, LAST_OFFSET) 49 DEFINE_ALIGN_SIZE(LAST_OFFSET); 50 static constexpr size_t DATA_OFFSET = SIZE; // DATA_OFFSET equal to Empty ByteArray size 51 52 DECL_DUMP() 53 54 private: 55 friend class ObjectFactory; 56 }; 57 58 static_assert(ByteArray::ARRAY_LENGTH_OFFSET == sizeof(TaggedObject)); 59 static_assert((ByteArray::DATA_OFFSET % static_cast<uint8_t>(MemAlignment::MEM_ALIGN_OBJECT)) == 0); 60 } // namespace panda::ecmascript 61 #endif // ECMASCRIPT_BYTE_ARRAY_H 62