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 21 namespace panda::ecmascript { 22 class Constants final { 23 public: 24 explicit 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