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 ECMASCRIPT_JS_THREAD_HCLASS_ENTRIES_H 17 #define ECMASCRIPT_JS_THREAD_HCLASS_ENTRIES_H 18 19 #include <string_view> 20 #include "ecmascript/common.h" 21 #include "ecmascript/ts_types/builtin_type_id.h" 22 23 namespace panda::ecmascript { 24 class GlobalEnv; 25 class JSHClass; 26 27 // Records initial HClass of builtin objects. 28 // Let X be the builtin object (e.g. X = Array, object, etc.), 29 // HClass address mismatch happens if properties in X or X.prototype are modified (with HClass change), 30 // thus the record entries are useful to detect builtin object modification. 31 struct BuiltinHClassEntries { 32 #define TS_BUILTIN_TYPE_ITEM(TYPE) BuiltinTypeId::TYPE, 33 static constexpr std::array BUILTIN_TYPES = { 34 TS_BUILTIN_TYPE_LIST(TS_BUILTIN_TYPE_ITEM) 35 }; 36 static constexpr size_t N_ENTRIES = static_cast<size_t>(BuiltinTypeId::NUM_OF_BUILTIN_TYPES); 37 #undef TS_BUILTIN_TYPE_ITEM 38 39 struct Entry { 40 // Let X be the builtin object (e.g. X = Array, Object, etc.) 41 // builtinHClass = HClass of X 42 JSHClass *builtinHClass = nullptr; 43 // prototypeHClass = HClass of X.prototype 44 JSHClass *prototypeHClass = nullptr; 45 }; 46 Entry entries[N_ENTRIES]; 47 GetEntryIndexBuiltinHClassEntries48 static size_t GetEntryIndex(BuiltinTypeId type) 49 { 50 size_t res = static_cast<size_t>(type) - INDEX_OFFSET; 51 ASSERT(res < N_ENTRIES); 52 return res; 53 } 54 EntryIsValidBuiltinHClassEntries55 size_t EntryIsValid(BuiltinTypeId type) const 56 { 57 size_t index = GetEntryIndex(type); 58 return entries[index].builtinHClass != nullptr && entries[index].prototypeHClass != nullptr; 59 } 60 GetBuiltinHClassOffsetBuiltinHClassEntries61 static size_t GetBuiltinHClassOffset(BuiltinTypeId type) 62 { 63 size_t index = GetEntryIndex(type); 64 return sizeof(Entry) * index + MEMBER_OFFSET(Entry, builtinHClass); 65 } 66 GetPrototypeHClassOffsetBuiltinHClassEntries67 static size_t GetPrototypeHClassOffset(BuiltinTypeId type) 68 { 69 size_t index = GetEntryIndex(type); 70 return sizeof(Entry) * index + MEMBER_OFFSET(Entry, prototypeHClass); 71 } 72 73 static constexpr size_t SizeArch32 = sizeof(entries); 74 static constexpr size_t SizeArch64 = sizeof(entries); 75 76 private: 77 static constexpr size_t INDEX_OFFSET = static_cast<size_t>(BuiltinTypeId::BUILTIN_OFFSET) + 1; 78 }; 79 STATIC_ASSERT_EQ_ARCH(sizeof(BuiltinHClassEntries), 80 BuiltinHClassEntries::SizeArch32, 81 BuiltinHClassEntries::SizeArch64); 82 } // namespace panda::ecmascript 83 84 #endif // ECMASCRIPT_JS_THREAD_HCLASS_ENTRIES_H 85