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_SNAPSHOT_MEM_CONSTANTS_H
17#define ECMASCRIPT_SNAPSHOT_MEM_CONSTANTS_H
18
19#include "ecmascript/mem/mem_common.h"
20
21namespace panda::ecmascript {
22class Constants final {
23public:
24    Constants() = default;
25    ~Constants() = default;
26    NO_COPY_SEMANTIC(Constants);
27    NO_MOVE_SEMANTIC(Constants);
28
29    static constexpr int MAX_C_POINTER_BITS_COUNT = 10;
30    static constexpr int MAX_REGION_INDEX_BITS_COUNT = 10;
31    static constexpr int MAX_OBJECT_OFFSET_BITS_COUNT = 18;
32    static constexpr int MAX_C_POINTER_INDEX = (1U << MAX_C_POINTER_BITS_COUNT) - 1;
33    static constexpr int MAX_REGION_INDEX = (1U << MAX_REGION_INDEX_BITS_COUNT) - 1;
34    static constexpr int MAX_OBJECT_OFFSET = (1U << MAX_OBJECT_OFFSET_BITS_COUNT) - 1;
35
36    // object or space align up
37    static constexpr size_t PAGE_SIZE_ALIGN_UP = 4_KB;
38    static constexpr size_t FREE_OBJECT_MIN_SIZE = 16;
39    static constexpr size_t MAX_UINT_16 = 0xFFFF;
40    static constexpr size_t MAX_UINT_32 = 0xFFFFFFFF;
41    static constexpr size_t MAX_OBJECT_INDEX = 0x0FFFFFFF;
42    static constexpr size_t REGION_INDEX_MASK = 0x3FF; // 10 bits
43    static constexpr int UINT_32_BITS_COUNT = 32;
44    static constexpr int UINT_64_BITS_COUNT = 64;
45
46    // serialize use constants
47    static constexpr uint8_t MASK_METHOD_SPACE_BEGIN = 0xFF;
48};
49}  // namespace panda::ecmascript
50
51#endif  // ECMASCRIPT_SNAPSHOT_MEM_CONSTANTS_H
52