1 /* 2 * Copyright (c) 2023 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 MAPLEBE_INCLUDE_BE_RT_H 17 #define MAPLEBE_INCLUDE_BE_RT_H 18 19 #include <cstdint> 20 #include <string> 21 22 namespace maplebe { 23 /* 24 * This class contains constants about the ABI of the runtime, such as symbols 25 * for GC-related metadata in generated binary files. 26 */ 27 class RTSupport { 28 public: GetRTSupportInstance()29 static RTSupport &GetRTSupportInstance() 30 { 31 static RTSupport RtSupport; 32 return RtSupport; 33 } GetObjectAlignment()34 uint64_t GetObjectAlignment() const 35 { 36 return kObjectAlignment; 37 } GetArrayContentOffset()38 int64_t GetArrayContentOffset() const 39 { 40 return kArrayContentOffset; 41 } GetArrayLengthOffset()42 int64_t GetArrayLengthOffset() const 43 { 44 return kArrayLengthOffset; 45 } GetFieldSize()46 uint64_t GetFieldSize() const 47 { 48 return kRefFieldSize; 49 } GetFieldAlign()50 uint64_t GetFieldAlign() const 51 { 52 return kRefFieldAlign; 53 } 54 55 protected: 56 static constexpr uint64_t kObjectAlignment = 8; 57 58 #ifdef USE_32BIT_REF 59 static constexpr uint32_t kRefFieldSize = 4; 60 static constexpr uint32_t kRefFieldAlign = 4; 61 #else 62 static constexpr uint32_t kRefFieldSize = 8; 63 static constexpr uint32_t kRefFieldAlign = 8; 64 #endif /* USE_32BIT_REF */ 65 /* The array length offset is fixed since CONTENT_OFFSET is fixed to simplify code */ 66 static constexpr int64_t kArrayLengthOffset = 12; /* shadow + monitor + [padding] */ 67 /* The array content offset is aligned to 8B to alow hosting of size-8B elements */ 68 static constexpr int64_t kArrayContentOffset = 16; /* fixed */ 69 70 private: RTSupport()71 RTSupport() {} 72 }; 73 } /* namespace maplebe */ 74 75 #endif /* MAPLEBE_INCLUDE_BE_RT_H */