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 // Let x be the builtin instance object (e.g. x = new Array(), new Object(), etc.) 44 // instanceHClass = HClass of x 45 JSHClass *instanceHClass = nullptr; 46 // prototypeHClass = HClass of X.prototype 47 JSHClass *prototypeHClass = nullptr; 48 // prototypeOfPrototypeHClass = HClass of X.prototype.prototype 49 JSHClass *prototypeOfPrototypeHClass = nullptr; 50 //extraHClass . In typedArray means instanceHClassOnHeap 51 JSHClass *extraHClass = nullptr; 52 }; 53 Entry entries[N_ENTRIES]; 54 GetEntryIndexBuiltinHClassEntries55 static size_t GetEntryIndex(BuiltinTypeId type) 56 { 57 size_t res = static_cast<size_t>(type) - INDEX_OFFSET; 58 ASSERT(res < N_ENTRIES); 59 return res; 60 } 61 EntryIsValidBuiltinHClassEntries62 size_t EntryIsValid(BuiltinTypeId type) const 63 { 64 size_t index = GetEntryIndex(type); 65 return entries[index].builtinHClass != nullptr && entries[index].prototypeHClass != nullptr; 66 } 67 GetBuiltinHClassOffsetBuiltinHClassEntries68 static size_t GetBuiltinHClassOffset(BuiltinTypeId type) 69 { 70 size_t index = GetEntryIndex(type); 71 return sizeof(Entry) * index + MEMBER_OFFSET(Entry, builtinHClass); 72 } 73 GetInstanceHClassOffsetBuiltinHClassEntries74 static size_t GetInstanceHClassOffset(BuiltinTypeId type) 75 { 76 size_t index = GetEntryIndex(type); 77 return sizeof(Entry) * index + MEMBER_OFFSET(Entry, instanceHClass); 78 } 79 GetExtraHClassOffsetBuiltinHClassEntries80 static size_t GetExtraHClassOffset(BuiltinTypeId type) 81 { 82 size_t index = GetEntryIndex(type); 83 return sizeof(Entry) * index + MEMBER_OFFSET(Entry, extraHClass); 84 } 85 GetPrototypeHClassOffsetBuiltinHClassEntries86 static size_t GetPrototypeHClassOffset(BuiltinTypeId type) 87 { 88 size_t index = GetEntryIndex(type); 89 return sizeof(Entry) * index + MEMBER_OFFSET(Entry, prototypeHClass); 90 } 91 GetPrototypeOfPrototypeHClassOffsetBuiltinHClassEntries92 static size_t GetPrototypeOfPrototypeHClassOffset(BuiltinTypeId type) 93 { 94 size_t index = GetEntryIndex(type); 95 return sizeof(Entry) * index + MEMBER_OFFSET(Entry, prototypeOfPrototypeHClass); 96 } 97 98 static constexpr size_t SizeArch32 = sizeof(entries); 99 static constexpr size_t SizeArch64 = sizeof(entries); 100 101 private: 102 static constexpr size_t INDEX_OFFSET = static_cast<size_t>(BuiltinTypeId::BUILTIN_OFFSET) + 1; 103 }; 104 STATIC_ASSERT_EQ_ARCH(sizeof(BuiltinHClassEntries), 105 BuiltinHClassEntries::SizeArch32, 106 BuiltinHClassEntries::SizeArch64); 107 } // namespace panda::ecmascript 108 109 #endif // ECMASCRIPT_JS_THREAD_HCLASS_ENTRIES_H 110