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 
ComputeDataSize(size_t elemSize, uint32_t length)38     static inline size_t ComputeDataSize(size_t elemSize, uint32_t length)
39     {
40         ASSERT(elemSize != 0);
41         return elemSize * length;
42     }
43 
GetPointerLength()44     size_t GetPointerLength()
45     {
46         size_t byteSize = ComputeDataSize(GetArrayLength(), GetByteLength());
47         return AlignUp(byteSize, static_cast<size_t>(MemAlignment::MEM_ALIGN_OBJECT)) / sizeof(JSTaggedType);
48     }
49 
GetData(uint32_t index = 0) const50     inline void *GetData(uint32_t index = 0) const
51     {
52         return reinterpret_cast<void *>(ToUintPtr(this) + DATA_OFFSET + index * GetByteLength());
53     }
54 
55     void Set(JSThread* thread, uint32_t idx, DataViewType type, JSTaggedType val, uint32_t offset = 0);
56     JSTaggedValue Get(JSThread *thread, uint32_t idx, DataViewType type, uint32_t offset = 0);
57 
58     static constexpr size_t ARRAY_LENGTH_OFFSET = TaggedObjectSize();
59     ACCESSORS_PRIMITIVE_FIELD(ArrayLength, uint32_t, ARRAY_LENGTH_OFFSET, BYTE_LENGTH_OFFSET)
60     ACCESSORS_PRIMITIVE_FIELD(ByteLength, uint32_t, BYTE_LENGTH_OFFSET, LAST_OFFSET)
61     DEFINE_ALIGN_SIZE(LAST_OFFSET);
62     static constexpr size_t DATA_OFFSET = SIZE;  // DATA_OFFSET equal to Empty ByteArray size
63 
64     DECL_VISIT_ARRAY(DATA_OFFSET, 0, GetPointerLength());
65     DECL_DUMP()
66 
67 private:
68     friend class ObjectFactory;
69 };
70 
71 static_assert(ByteArray::ARRAY_LENGTH_OFFSET == sizeof(TaggedObject));
72 static_assert((ByteArray::DATA_OFFSET % static_cast<uint8_t>(MemAlignment::MEM_ALIGN_OBJECT)) == 0);
73 }  // namespace panda::ecmascript
74 #endif  // ECMASCRIPT_BYTE_ARRAY_H
75