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_IC_PROTOTYPE_CHANGE_DETAILS_H 17 #define ECMASCRIPT_IC_PROTOTYPE_CHANGE_DETAILS_H 18 19 #include "ecmascript/ecma_macros.h" 20 #include "ecmascript/js_handle.h" 21 #include "ecmascript/js_tagged_value.h" 22 #include "ecmascript/weak_vector.h" 23 24 namespace panda { 25 namespace ecmascript { 26 class ProtoChangeMarker : public TaggedObject { 27 public: Cast(TaggedObject * object)28 static ProtoChangeMarker *Cast(TaggedObject *object) 29 { 30 ASSERT(JSTaggedValue(object).IsProtoChangeMarker()); 31 return static_cast<ProtoChangeMarker *>(object); 32 } 33 34 static constexpr size_t BIT_FIELD_OFFSET = TaggedObjectSize(); 35 ACCESSORS_BIT_FIELD(BitField, BIT_FIELD_OFFSET, LAST_OFFSET) 36 DEFINE_ALIGN_SIZE(LAST_OFFSET); 37 DECL_VISIT_PRIMITIVE_OBJECT() 38 39 // define BitField 40 static constexpr size_t HAS_CHANGED_BITS = 1; 41 static constexpr size_t ACCESSOR_HAS_CHANGED_BITS = 1; 42 static constexpr size_t NOTFOUND_HAS_CHANGED_BITS = 1; 43 FIRST_BIT_FIELD(BitField, HasChanged, bool, HAS_CHANGED_BITS); 44 NEXT_BIT_FIELD(BitField, AccessorHasChanged, bool, ACCESSOR_HAS_CHANGED_BITS, HasChanged); 45 46 // The "NotFoundHasChanged" flag is introduced to address a specific issue. In the "RuntimeUpdateAOTHClass", 47 // the "HasChanged" flag is not modified when a key is absent from the prototype chain. However, when using 48 // the "not found" inline cache (IC), even if the key is not in the prototype chain, it might still impact 49 // the listeners' ICs. 50 // To handle this situation, we've added the `NotFoundHasChanged` flag, which is exclusively used for the 51 // "not found" ICs. 52 NEXT_BIT_FIELD(BitField, NotFoundHasChanged, bool, NOTFOUND_HAS_CHANGED_BITS, HasChanged); 53 54 DECL_DUMP() 55 }; 56 57 class ProtoChangeDetails : public TaggedObject { 58 public: 59 static constexpr int UNREGISTERED = -1; Cast(TaggedObject * object)60 static ProtoChangeDetails *Cast(TaggedObject *object) 61 { 62 ASSERT(JSTaggedValue(object).IsProtoChangeDetails()); 63 return static_cast<ProtoChangeDetails *>(object); 64 } 65 66 static constexpr size_t CHANGE_LISTENER_OFFSET = TaggedObjectSize(); 67 ACCESSORS(ChangeListener, CHANGE_LISTENER_OFFSET, REGISTER_INDEX_OFFSET); 68 ACCESSORS_PRIMITIVE_FIELD(RegisterIndex, uint32_t, REGISTER_INDEX_OFFSET, LAST_OFFSET); 69 DEFINE_ALIGN_SIZE(LAST_OFFSET); 70 71 DECL_VISIT_OBJECT(CHANGE_LISTENER_OFFSET, REGISTER_INDEX_OFFSET) 72 DECL_DUMP() 73 }; 74 75 class ChangeListener : public WeakVector { 76 public: Cast(TaggedObject * object)77 static ChangeListener *Cast(TaggedObject *object) 78 { 79 return static_cast<ChangeListener *>(object); 80 } 81 82 static JSHandle<ChangeListener> Add(const JSThread *thread, const JSHandle<ChangeListener> &array, 83 const JSHandle<JSHClass> &value, uint32_t *index); 84 85 static uint32_t CheckHole(const JSHandle<ChangeListener> &array); 86 87 JSTaggedValue Get(uint32_t index); 88 }; 89 } // namespace ecmascript 90 } // namespace panda 91 92 #endif // ECMASCRIPT_IC_PROTOTYPE_CHANGE_DETAILS_H 93