| // Copyright 2018 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef V8_OBJECTS_JS_OBJECTS_H_ |
| #define V8_OBJECTS_JS_OBJECTS_H_ |
| |
| #include "src/base/optional.h" |
| #include "src/common/globals.h" |
| #include "src/handles/handles.h" |
| #include "src/objects/embedder-data-slot.h" |
| // TODO(jkummerow): Consider forward-declaring instead. |
| #include "src/objects/internal-index.h" |
| #include "src/objects/objects.h" |
| #include "src/objects/property-array.h" |
| |
| // Has to be the last include (doesn't have include guards): |
| #include "src/objects/object-macros.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // Enum for functions that offer a second mode that does not cause allocations. |
| // Used in conjunction with LookupIterator and unboxed double fields. |
| enum class AllocationPolicy { kAllocationAllowed, kAllocationDisallowed }; |
| |
| enum InstanceType : uint16_t; |
| class JSGlobalObject; |
| class JSGlobalProxy; |
| class LookupIterator; |
| class PropertyDescriptor; |
| class PropertyKey; |
| class NativeContext; |
| class IsCompiledScope; |
| class SwissNameDictionary; |
| class ElementsAccessor; |
| |
| #include "torque-generated/src/objects/js-objects-tq.inc" |
| |
| // JSReceiver includes types on which properties can be defined, i.e., |
| // JSObject and JSProxy. |
| class JSReceiver : public TorqueGeneratedJSReceiver<JSReceiver, HeapObject> { |
| public: |
| NEVER_READ_ONLY_SPACE |
| // Returns true if there is no slow (ie, dictionary) backing store. |
| DECL_GETTER(HasFastProperties, bool) |
| |
| // Returns the properties array backing store if it |
| // exists. Otherwise, returns an empty_property_array when there's a |
| // Smi (hash code) or an empty_fixed_array for a fast properties |
| // map. |
| DECL_GETTER(property_array, Tagged<PropertyArray>) |
| |
| // Gets slow properties for non-global objects (if |
| // v8_enable_swiss_name_dictionary is not set). |
| DECL_GETTER(property_dictionary, Tagged<NameDictionary>) |
| |
| // Gets slow properties for non-global objects (if |
| // v8_enable_swiss_name_dictionary is set). |
| DECL_GETTER(property_dictionary_swiss, Tagged<SwissNameDictionary>) |
| |
| // Sets the properties backing store and makes sure any existing hash is moved |
| // to the new properties store. To clear out the properties store, pass in the |
| // empty_fixed_array(), the hash will be maintained in this case as well. |
| void SetProperties(Tagged<HeapObject> properties); |
| |
| // There are five possible values for the properties offset. |
| // 1) EmptyFixedArray/EmptyPropertyDictionary - This is the standard |
| // placeholder. |
| // |
| // 2) Smi - This is the hash code of the object. |
| // |
| // 3) PropertyArray - This is similar to a FixedArray but stores |
| // the hash code of the object in its length field. This is a fast |
| // backing store. |
| // |
| // 4) NameDictionary - This is the dictionary-mode backing store. |
| // |
| // 4) GlobalDictionary - This is the backing store for the |
| // GlobalObject. |
| // |
| // This is used only in the deoptimizer and heap. Please use the |
| // above typed getters and setters to access the properties. |
| DECL_ACCESSORS(raw_properties_or_hash, Tagged<Object>) |
| DECL_RELAXED_ACCESSORS(raw_properties_or_hash, Tagged<Object>) |
| |
| inline void initialize_properties(Isolate* isolate); |
| |
| // Deletes an existing named property in a normalized object. |
| static void DeleteNormalizedProperty(Handle<JSReceiver> object, |
| InternalIndex entry); |
| |
| // ES6 section 7.1.1 ToPrimitive |
| V8_WARN_UNUSED_RESULT static MaybeHandle<Object> ToPrimitive( |
| Isolate* isolate, Handle<JSReceiver> receiver, |
| ToPrimitiveHint hint = ToPrimitiveHint::kDefault); |
| |
| // ES6 section 7.1.1.1 OrdinaryToPrimitive |
| V8_WARN_UNUSED_RESULT static MaybeHandle<Object> OrdinaryToPrimitive( |
| Isolate* isolate, Handle<JSReceiver> receiver, |
| OrdinaryToPrimitiveHint hint); |
| |
| // Unwraps the chain of potential function wrappers or JSProxy objects and |
| // return the leaf function's creation context. |
| // Throws TypeError in case there's a revoked JSProxy on the way. |
| // https://tc39.es/ecma262/#sec-getfunctionrealm |
| static MaybeHandle<NativeContext> GetFunctionRealm( |
| Handle<JSReceiver> receiver); |
| |
| V8_EXPORT_PRIVATE static MaybeHandle<NativeContext> GetContextForMicrotask( |
| Handle<JSReceiver> receiver); |
| |
| // Get the first non-hidden prototype. |
| static inline MaybeHandle<HeapObject> GetPrototype( |
| Isolate* isolate, Handle<JSReceiver> receiver); |
| |
| V8_WARN_UNUSED_RESULT static Maybe<bool> HasInPrototypeChain( |
| Isolate* isolate, Handle<JSReceiver> object, Handle<Object> proto); |
| |
| // Reads all enumerable own properties of source and adds them to |
| // target, using either Set or CreateDataProperty depending on the |
| // use_set argument. This only copies values not present in the |
| // maybe_excluded_properties list. |
| V8_WARN_UNUSED_RESULT static Maybe<bool> SetOrCopyDataProperties( |
| Isolate* isolate, Handle<JSReceiver> target, Handle<Object> source, |
| PropertiesEnumerationMode mode, |
| const base::ScopedVector<Handle<Object>>* excluded_properties = nullptr, |
| bool use_set = true); |
| |
| // Implementation of [[HasProperty]], ECMA-262 5th edition, section 8.12.6. |
| V8_EXPORT_PRIVATE V8_WARN_UNUSED_RESULT static Maybe<bool> HasProperty( |
| LookupIterator* it); |
| V8_WARN_UNUSED_RESULT static inline Maybe<bool> HasProperty( |
| Isolate* isolate, Handle<JSReceiver> object, Handle<Name> name); |
| V8_WARN_UNUSED_RESULT static inline Maybe<bool> HasElement( |
| Isolate* isolate, Handle<JSReceiver> object, uint32_t index); |
| |
| V8_EXPORT_PRIVATE V8_WARN_UNUSED_RESULT static Maybe<bool> HasOwnProperty( |
| Isolate* isolate, Handle<JSReceiver> object, Handle<Name> name); |
| V8_WARN_UNUSED_RESULT static inline Maybe<bool> HasOwnProperty( |
| Isolate* isolate, Handle<JSReceiver> object, uint32_t index); |
| |
| V8_WARN_UNUSED_RESULT static inline MaybeHandle<Object> GetProperty( |
| Isolate* isolate, Handle<JSReceiver> receiver, const char* key); |
| V8_WARN_UNUSED_RESULT static inline MaybeHandle<Object> GetProperty( |
| Isolate* isolate, Handle<JSReceiver> receiver, Handle<Name> name); |
| V8_WARN_UNUSED_RESULT static inline MaybeHandle<Object> GetElement( |
| Isolate* isolate, Handle<JSReceiver> receiver, uint32_t index); |
| |
| // Implementation of ES6 [[Delete]] |
| V8_EXPORT_PRIVATE V8_WARN_UNUSED_RESULT static Maybe<bool> |
| DeletePropertyOrElement(Handle<JSReceiver> object, Handle<Name> name, |
| LanguageMode language_mode = LanguageMode::kSloppy); |
| V8_EXPORT_PRIVATE V8_WARN_UNUSED_RESULT static Maybe<bool> DeleteProperty( |
| Handle<JSReceiver> object, Handle<Name> name, |
| LanguageMode language_mode = LanguageMode::kSloppy); |
| V8_WARN_UNUSED_RESULT static Maybe<bool> DeleteProperty( |
| LookupIterator* it, LanguageMode language_mode); |
| V8_WARN_UNUSED_RESULT static Maybe<bool> DeleteElement( |
| Handle<JSReceiver> object, uint32_t index, |
| LanguageMode language_mode = LanguageMode::kSloppy); |
| |
| V8_WARN_UNUSED_RESULT static Tagged<Object> DefineProperty( |
| Isolate* isolate, Handle<Object> object, Handle<Object> name, |
| Handle<Object> attributes); |
| V8_WARN_UNUSED_RESULT static MaybeHandle<Object> DefineProperties( |
| Isolate* isolate, Handle<Object> object, Handle<Object> properties); |
| |
| // "virtual" dispatcher to the correct [[DefineOwnProperty]] implementation. |
| V8_WARN_UNUSED_RESULT static Maybe<bool> DefineOwnProperty( |
| Isolate* isolate, Handle<JSReceiver> object, Handle<Object> key, |
| PropertyDescriptor* desc, Maybe<ShouldThrow> should_throw); |
| |
| // Check if private name property can be store on the object. It will return |
| // false with an error when it cannot but didn't throw, or a Nothing if |
| // it throws. |
| V8_WARN_UNUSED_RESULT static Maybe<bool> CheckPrivateNameStore( |
| LookupIterator* it, bool is_define); |
| |
| // ES6 7.3.4 (when passed kDontThrow) |
| V8_WARN_UNUSED_RESULT static Maybe<bool> CreateDataProperty( |
| Isolate* isolate, Handle<JSReceiver> object, Handle<Name> key, |
| Handle<Object> value, Maybe<ShouldThrow> should_throw); |
| V8_WARN_UNUSED_RESULT static Maybe<bool> CreateDataProperty( |
| Isolate* isolate, Handle<Object> object, PropertyKey key, |
| Handle<Object> value, Maybe<ShouldThrow> should_throw); |
| V8_WARN_UNUSED_RESULT static Maybe<bool> CreateDataProperty( |
| Isolate* isolate, Handle<JSReceiver> object, PropertyKey key, |
| Handle<Object> value, Maybe<ShouldThrow> should_throw); |
| |
| // Add private fields to the receiver, ignoring extensibility and the |
| // traps. The caller should check that the private field does not already |
| // exist on the receiver before calling this method. |
| V8_WARN_UNUSED_RESULT static Maybe<bool> AddPrivateField( |
| LookupIterator* it, Handle<Object> value, |
| Maybe<ShouldThrow> should_throw); |
| |
| // ES6 9.1.6.1 |
| V8_WARN_UNUSED_RESULT static Maybe<bool> OrdinaryDefineOwnProperty( |
| Isolate* isolate, Handle<JSObject> object, Handle<Object> key, |
| PropertyDescriptor* desc, Maybe<ShouldThrow> should_throw); |
| V8_WARN_UNUSED_RESULT static Maybe<bool> OrdinaryDefineOwnProperty( |
| Isolate* isolate, Handle<JSObject> object, const PropertyKey& key, |
| PropertyDescriptor* desc, Maybe<ShouldThrow> should_throw); |
| V8_WARN_UNUSED_RESULT static Maybe<bool> OrdinaryDefineOwnProperty( |
| LookupIterator* it, PropertyDescriptor* desc, |
| Maybe<ShouldThrow> should_throw); |
| // ES6 9.1.6.2 |
| V8_WARN_UNUSED_RESULT static Maybe<bool> IsCompatiblePropertyDescriptor( |
| Isolate* isolate, bool extensible, PropertyDescriptor* desc, |
| PropertyDescriptor* current, Handle<Name> property_name, |
| Maybe<ShouldThrow> should_throw); |
| // ES6 9.1.6.3 |
| // |it| can be NULL in cases where the ES spec passes |undefined| as the |
| // receiver. Exactly one of |it| and |property_name| must be provided. |
| V8_WARN_UNUSED_RESULT static Maybe<bool> ValidateAndApplyPropertyDescriptor( |
| Isolate* isolate, LookupIterator* it, bool extensible, |
| PropertyDescriptor* desc, PropertyDescriptor* current, |
| Maybe<ShouldThrow> should_throw, Handle<Name> property_name); |
| |
| V8_EXPORT_PRIVATE V8_WARN_UNUSED_RESULT static Maybe<bool> |
| GetOwnPropertyDescriptor(Isolate* isolate, Handle<JSReceiver> object, |
| Handle<Object> key, PropertyDescriptor* desc); |
| V8_WARN_UNUSED_RESULT static Maybe<bool> GetOwnPropertyDescriptor( |
| LookupIterator* it, PropertyDescriptor* desc); |
| |
| using IntegrityLevel = PropertyAttributes; |
| |
| // ES6 7.3.14 (when passed kDontThrow) |
| // 'level' must be SEALED or FROZEN. |
| V8_WARN_UNUSED_RESULT static Maybe<bool> SetIntegrityLevel( |
| Isolate* isolate, Handle<JSReceiver> object, IntegrityLevel lvl, |
| ShouldThrow should_throw); |
| |
| // ES6 7.3.15 |
| // 'level' must be SEALED or FROZEN. |
| V8_WARN_UNUSED_RESULT static Maybe<bool> TestIntegrityLevel( |
| Isolate* isolate, Handle<JSReceiver> object, IntegrityLevel lvl); |
| |
| // ES6 [[PreventExtensions]] (when passed kDontThrow) |
| V8_WARN_UNUSED_RESULT static Maybe<bool> PreventExtensions( |
| Isolate* isolate, Handle<JSReceiver> object, ShouldThrow should_throw); |
| |
| V8_WARN_UNUSED_RESULT static Maybe<bool> IsExtensible( |
| Isolate* isolate, Handle<JSReceiver> object); |
| |
| // Returns the class name. |
| V8_EXPORT_PRIVATE Tagged<String> class_name(); |
| |
| // Returns the constructor (the function that was used to instantiate the |
| // object). |
| static MaybeHandle<JSFunction> GetConstructor(Isolate* isolate, |
| Handle<JSReceiver> receiver); |
| |
| // Returns the constructor name (the (possibly inferred) name of the function |
| // that was used to instantiate the object), if any. If a FunctionTemplate is |
| // used to instantiate the object, the class_name of the FunctionTemplate is |
| // returned instead. |
| static Handle<String> GetConstructorName(Isolate* isolate, |
| Handle<JSReceiver> receiver); |
| |
| V8_EXPORT_PRIVATE inline base::Optional<Tagged<NativeContext>> |
| GetCreationContext(); |
| V8_EXPORT_PRIVATE inline MaybeHandle<NativeContext> GetCreationContext( |
| Isolate* isolate); |
| |
| V8_WARN_UNUSED_RESULT static inline Maybe<PropertyAttributes> |
| GetPropertyAttributes(Handle<JSReceiver> object, Handle<Name> name); |
| V8_WARN_UNUSED_RESULT static inline Maybe<PropertyAttributes> |
| GetOwnPropertyAttributes(Handle<JSReceiver> object, Handle<Name> name); |
| V8_WARN_UNUSED_RESULT static inline Maybe<PropertyAttributes> |
| GetOwnPropertyAttributes(Handle<JSReceiver> object, uint32_t index); |
| |
| V8_WARN_UNUSED_RESULT static inline Maybe<PropertyAttributes> |
| GetElementAttributes(Handle<JSReceiver> object, uint32_t index); |
| V8_WARN_UNUSED_RESULT static inline Maybe<PropertyAttributes> |
| GetOwnElementAttributes(Handle<JSReceiver> object, uint32_t index); |
| |
| V8_WARN_UNUSED_RESULT static Maybe<PropertyAttributes> GetPropertyAttributes( |
| LookupIterator* it); |
| |
| // Set the object's prototype (only JSReceiver and null are allowed values). |
| V8_EXPORT_PRIVATE V8_WARN_UNUSED_RESULT static Maybe<bool> SetPrototype( |
| Isolate* isolate, Handle<JSReceiver> object, Handle<Object> value, |
| bool from_javascript, ShouldThrow should_throw); |
| |
| inline static Handle<Object> GetDataProperty(Isolate* isolate, |
| Handle<JSReceiver> object, |
| Handle<Name> name); |
| V8_EXPORT_PRIVATE static Handle<Object> GetDataProperty( |
| LookupIterator* it, AllocationPolicy allocation_policy = |
| AllocationPolicy::kAllocationAllowed); |
| |
| // Retrieves a permanent object identity hash code. The undefined value might |
| // be returned in case no hash was created yet. |
| V8_EXPORT_PRIVATE Tagged<Object> GetIdentityHash(); |
| |
| // Retrieves a permanent object identity hash code. May create and store a |
| // hash code if needed and none exists. |
| static Tagged<Smi> CreateIdentityHash(Isolate* isolate, |
| Tagged<JSReceiver> key); |
| V8_EXPORT_PRIVATE Tagged<Smi> GetOrCreateIdentityHash(Isolate* isolate); |
| |
| // Stores the hash code. The hash passed in must be masked with |
| // JSReceiver::kHashMask. |
| V8_EXPORT_PRIVATE void SetIdentityHash(int masked_hash); |
| |
| // ES6 [[OwnPropertyKeys]] (modulo return type) |
| V8_WARN_UNUSED_RESULT static inline MaybeHandle<FixedArray> OwnPropertyKeys( |
| Isolate* isolate, Handle<JSReceiver> object); |
| |
| V8_WARN_UNUSED_RESULT static MaybeHandle<FixedArray> GetOwnValues( |
| Isolate* isolate, Handle<JSReceiver> object, PropertyFilter filter, |
| bool try_fast_path = true); |
| |
| V8_WARN_UNUSED_RESULT static MaybeHandle<FixedArray> GetOwnEntries( |
| Isolate* isolate, Handle<JSReceiver> object, PropertyFilter filter, |
| bool try_fast_path = true); |
| |
| static const int kHashMask = PropertyArray::HashField::kMask; |
| |
| bool HasProxyInPrototype(Isolate* isolate); |
| |
| // TC39 "Dynamic Code Brand Checks" |
| bool IsCodeLike(Isolate* isolate) const; |
| |
| private: |
| // Hide generated accessors; custom accessors are called |
| // "raw_properties_or_hash". |
| DECL_ACCESSORS(properties_or_hash, Tagged<Object>) |
| |
| TQ_OBJECT_CONSTRUCTORS(JSReceiver) |
| }; |
| |
| // The JSObject describes real heap allocated JavaScript objects with |
| // properties. |
| // Note that the map of JSObject changes during execution to enable inline |
| // caching. |
| class JSObject : public TorqueGeneratedJSObject<JSObject, JSReceiver> { |
| public: |
| static bool IsUnmodifiedApiObject(FullObjectSlot o); |
| |
| V8_EXPORT_PRIVATE static V8_WARN_UNUSED_RESULT MaybeHandle<JSObject> New( |
| Handle<JSFunction> constructor, Handle<JSReceiver> new_target, |
| Handle<AllocationSite> site, |
| NewJSObjectType = NewJSObjectType::kNoAPIWrapper); |
| |
| static MaybeHandle<JSObject> NewWithMap( |
| Isolate* isolate, Handle<Map> initial_map, Handle<AllocationSite> site, |
| NewJSObjectType = NewJSObjectType::kNoAPIWrapper); |
| |
| // 9.1.12 ObjectCreate ( proto [ , internalSlotsList ] ) |
| // Notice: This is NOT 19.1.2.2 Object.create ( O, Properties ) |
| static V8_WARN_UNUSED_RESULT MaybeHandle<JSObject> ObjectCreate( |
| Isolate* isolate, Handle<Object> prototype); |
| |
| DECL_ACCESSORS(elements, Tagged<FixedArrayBase>) |
| DECL_RELAXED_GETTER(elements, Tagged<FixedArrayBase>) |
| |
| // Acquire/release semantics on this field are explicitly forbidden to avoid |
| // confusion, since the default setter uses relaxed semantics. If |
| // acquire/release semantics ever become necessary, the default setter should |
| // be reverted to non-atomic behavior, and setters with explicit tags |
| // introduced and used when required. |
| Tagged<FixedArrayBase> elements(PtrComprCageBase cage_base, |
| AcquireLoadTag tag) const = delete; |
| void set_elements(Tagged<FixedArrayBase> value, ReleaseStoreTag tag, |
| WriteBarrierMode mode = UPDATE_WRITE_BARRIER) = delete; |
| |
| inline void initialize_elements(); |
| static inline void SetMapAndElements(Handle<JSObject> object, Handle<Map> map, |
| Handle<FixedArrayBase> elements); |
| DECL_GETTER(GetElementsKind, ElementsKind) |
| DECL_GETTER(GetElementsAccessor, ElementsAccessor*) |
| |
| // Returns true if an object has elements of PACKED_SMI_ELEMENTS or |
| // HOLEY_SMI_ELEMENTS ElementsKind. |
| DECL_GETTER(HasSmiElements, bool) |
| // Returns true if an object has elements of PACKED_ELEMENTS or |
| // HOLEY_ELEMENTS ElementsKind. |
| DECL_GETTER(HasObjectElements, bool) |
| // Returns true if an object has elements of PACKED_SMI_ELEMENTS, |
| // HOLEY_SMI_ELEMENTS, PACKED_ELEMENTS, or HOLEY_ELEMENTS. |
| DECL_GETTER(HasSmiOrObjectElements, bool) |
| // Returns true if an object has any of the "fast" elements kinds. |
| DECL_GETTER(HasFastElements, bool) |
| // Returns true if an object has any of the PACKED elements kinds. |
| DECL_GETTER(HasFastPackedElements, bool) |
| // Returns true if an object has elements of PACKED_DOUBLE_ELEMENTS or |
| // HOLEY_DOUBLE_ELEMENTS ElementsKind. |
| DECL_GETTER(HasDoubleElements, bool) |
| // Returns true if an object has elements of HOLEY_SMI_ELEMENTS, |
| // HOLEY_DOUBLE_ELEMENTS, or HOLEY_ELEMENTS ElementsKind. |
| DECL_GETTER(HasHoleyElements, bool) |
| DECL_GETTER(HasSloppyArgumentsElements, bool) |
| DECL_GETTER(HasStringWrapperElements, bool) |
| DECL_GETTER(HasDictionaryElements, bool) |
| |
| // Returns true if an object has elements of PACKED_ELEMENTS |
| DECL_GETTER(HasPackedElements, bool) |
| DECL_GETTER(HasAnyNonextensibleElements, bool) |
| DECL_GETTER(HasSealedElements, bool) |
| DECL_GETTER(HasSharedArrayElements, bool) |
| DECL_GETTER(HasNonextensibleElements, bool) |
| |
| DECL_GETTER(HasTypedArrayOrRabGsabTypedArrayElements, bool) |
| |
| DECL_GETTER(HasFixedUint8ClampedElements, bool) |
| DECL_GETTER(HasFixedArrayElements, bool) |
| DECL_GETTER(HasFixedInt8Elements, bool) |
| DECL_GETTER(HasFixedUint8Elements, bool) |
| DECL_GETTER(HasFixedInt16Elements, bool) |
| DECL_GETTER(HasFixedUint16Elements, bool) |
| DECL_GETTER(HasFixedInt32Elements, bool) |
| DECL_GETTER(HasFixedUint32Elements, bool) |
| DECL_GETTER(HasFixedFloat16Elements, bool) |
| DECL_GETTER(HasFixedFloat32Elements, bool) |
| DECL_GETTER(HasFixedFloat64Elements, bool) |
| DECL_GETTER(HasFixedBigInt64Elements, bool) |
| DECL_GETTER(HasFixedBigUint64Elements, bool) |
| |
| DECL_GETTER(HasFastArgumentsElements, bool) |
| DECL_GETTER(HasSlowArgumentsElements, bool) |
| DECL_GETTER(HasFastStringWrapperElements, bool) |
| DECL_GETTER(HasSlowStringWrapperElements, bool) |
| bool HasEnumerableElements(); |
| |
| // Gets slow elements. |
| DECL_GETTER(element_dictionary, Tagged<NumberDictionary>) |
| |
| // Requires: HasFastElements(). |
| static void EnsureWritableFastElements(Handle<JSObject> object); |
| |
| V8_WARN_UNUSED_RESULT static Maybe<bool> SetPropertyWithInterceptor( |
| LookupIterator* it, Maybe<ShouldThrow> should_throw, |
| Handle<Object> value); |
| |
| // The API currently still wants DefineOwnPropertyIgnoreAttributes to convert |
| // AccessorInfo objects to data fields. We allow FORCE_FIELD as an exception |
| // to the default behavior that calls the setter. |
| enum AccessorInfoHandling { FORCE_FIELD, DONT_FORCE_FIELD }; |
| |
| V8_WARN_UNUSED_RESULT static MaybeHandle<Object> |
| DefineOwnPropertyIgnoreAttributes( |
| LookupIterator* it, Handle<Object> value, PropertyAttributes attributes, |
| AccessorInfoHandling handling = DONT_FORCE_FIELD, |
| EnforceDefineSemantics semantics = EnforceDefineSemantics::kSet); |
| |
| V8_WARN_UNUSED_RESULT static Maybe<bool> DefineOwnPropertyIgnoreAttributes( |
| LookupIterator* it, Handle<Object> value, PropertyAttributes attributes, |
| Maybe<ShouldThrow> should_throw, |
| AccessorInfoHandling handling = DONT_FORCE_FIELD, |
| EnforceDefineSemantics semantics = EnforceDefineSemantics::kSet, |
| StoreOrigin store_origin = StoreOrigin::kNamed); |
| |
| V8_WARN_UNUSED_RESULT static MaybeHandle<Object> V8_EXPORT_PRIVATE |
| SetOwnPropertyIgnoreAttributes(Handle<JSObject> object, Handle<Name> name, |
| Handle<Object> value, |
| PropertyAttributes attributes); |
| |
| V8_WARN_UNUSED_RESULT static MaybeHandle<Object> |
| SetOwnElementIgnoreAttributes(Handle<JSObject> object, size_t index, |
| Handle<Object> value, |
| PropertyAttributes attributes); |
| |
| // Equivalent to one of the above depending on whether |name| can be converted |
| // to an array index. |
| V8_EXPORT_PRIVATE V8_WARN_UNUSED_RESULT static MaybeHandle<Object> |
| DefinePropertyOrElementIgnoreAttributes(Handle<JSObject> object, |
| Handle<Name> name, |
| Handle<Object> value, |
| PropertyAttributes attributes = NONE); |
| |
| // Adds or reconfigures a property to attributes NONE. It will fail when it |
| // cannot. |
| V8_WARN_UNUSED_RESULT static Maybe<bool> CreateDataProperty( |
| Isolate* isolate, Handle<JSObject> object, PropertyKey key, |
| Handle<Object> value, Maybe<ShouldThrow> should_throw = Just(kDontThrow)); |
| |
| V8_EXPORT_PRIVATE static void AddProperty(Isolate* isolate, |
| Handle<JSObject> object, |
| Handle<Name> name, |
| Handle<Object> value, |
| PropertyAttributes attributes); |
| |
| // {name} must be a UTF-8 encoded, null-terminated string. |
| static void AddProperty(Isolate* isolate, Handle<JSObject> object, |
| const char* name, Handle<Object> value, |
| PropertyAttributes attributes); |
| |
| V8_EXPORT_PRIVATE static Maybe<bool> AddDataElement( |
| Handle<JSObject> receiver, uint32_t index, Handle<Object> value, |
| PropertyAttributes attributes); |
| |
| // Extend the receiver with a single fast property appeared first in the |
| // passed map. This also extends the property backing store if necessary. |
| static void AllocateStorageForMap(Handle<JSObject> object, Handle<Map> map); |
| |
| // Migrates the given object to a map whose field representations are the |
| // lowest upper bound of all known representations for that field. |
| static void MigrateInstance(Isolate* isolate, Handle<JSObject> instance); |
| |
| // Migrates the given object only if the target map is already available, |
| // or returns false if such a map is not yet available. |
| static bool TryMigrateInstance(Isolate* isolate, Handle<JSObject> instance); |
| |
| // Sets the property value in a normalized object given (key, value, details). |
| // Handles the special representation of JS global objects. |
| static void SetNormalizedProperty(Handle<JSObject> object, Handle<Name> name, |
| Handle<Object> value, |
| PropertyDetails details); |
| static void SetNormalizedElement(Handle<JSObject> object, uint32_t index, |
| Handle<Object> value, |
| PropertyDetails details); |
| |
| static void OptimizeAsPrototype(Handle<JSObject> object, |
| bool enable_setup_mode = true); |
| static void ReoptimizeIfPrototype(Handle<JSObject> object); |
| static void MakePrototypesFast(Handle<Object> receiver, |
| WhereToStart where_to_start, Isolate* isolate); |
| static void LazyRegisterPrototypeUser(Handle<Map> user, Isolate* isolate); |
| static void UpdatePrototypeUserRegistration(Handle<Map> old_map, |
| Handle<Map> new_map, |
| Isolate* isolate); |
| static bool UnregisterPrototypeUser(Handle<Map> user, Isolate* isolate); |
| static Tagged<Map> InvalidatePrototypeChains(Tagged<Map> map); |
| static void InvalidatePrototypeValidityCell(Tagged<JSGlobalObject> global); |
| |
| // Updates prototype chain tracking information when an object changes its |
| // map from |old_map| to |new_map|. |
| static void NotifyMapChange(Handle<Map> old_map, Handle<Map> new_map, |
| Isolate* isolate); |
| |
| // Utility used by many Array builtins and runtime functions |
| static inline bool PrototypeHasNoElements(Isolate* isolate, |
| Tagged<JSObject> object); |
| |
| // To be passed to PrototypeUsers::Compact. |
| static void PrototypeRegistryCompactionCallback(Tagged<HeapObject> value, |
| int old_index, int new_index); |
| |
| // Retrieve interceptors. |
| DECL_GETTER(GetNamedInterceptor, Tagged<InterceptorInfo>) |
| DECL_GETTER(GetIndexedInterceptor, Tagged<InterceptorInfo>) |
| |
| // Used from JSReceiver. |
| V8_WARN_UNUSED_RESULT static Maybe<PropertyAttributes> |
| GetPropertyAttributesWithInterceptor(LookupIterator* it); |
| V8_WARN_UNUSED_RESULT static Maybe<PropertyAttributes> |
| GetPropertyAttributesWithFailedAccessCheck(LookupIterator* it); |
| |
| // Defines an AccessorPair property on the given object. |
| V8_EXPORT_PRIVATE static MaybeHandle<Object> |
| DefineOwnAccessorIgnoreAttributes(Handle<JSObject> object, Handle<Name> name, |
| Handle<Object> getter, |
| Handle<Object> setter, |
| PropertyAttributes attributes); |
| static MaybeHandle<Object> DefineOwnAccessorIgnoreAttributes( |
| LookupIterator* it, Handle<Object> getter, Handle<Object> setter, |
| PropertyAttributes attributes); |
| |
| // Defines an AccessorInfo property on the given object. |
| V8_WARN_UNUSED_RESULT static MaybeHandle<Object> SetAccessor( |
| Handle<JSObject> object, Handle<Name> name, Handle<AccessorInfo> info, |
| PropertyAttributes attributes); |
| |
| // Check if a data property can be created on the object. It will fail with |
| // an error when it cannot. |
| V8_WARN_UNUSED_RESULT static Maybe<bool> CheckIfCanDefineAsConfigurable( |
| Isolate* isolate, LookupIterator* it, Handle<Object> value, |
| Maybe<ShouldThrow> should_throw); |
| |
| // The result must be checked first for exceptions. If there's no exception, |
| // the output parameter |done| indicates whether the interceptor has a result |
| // or not. |
| V8_WARN_UNUSED_RESULT static MaybeHandle<Object> GetPropertyWithInterceptor( |
| LookupIterator* it, bool* done); |
| |
| static void ValidateElements(Tagged<JSObject> object); |
| |
| // Makes sure that this object can contain HeapObject as elements. |
| static inline void EnsureCanContainHeapObjectElements(Handle<JSObject> obj); |
| |
| // Makes sure that this object can contain the specified elements. |
| // TSlot here is either ObjectSlot or FullObjectSlot. |
| template <typename TSlot> |
| static inline void EnsureCanContainElements(Handle<JSObject> object, |
| TSlot elements, uint32_t count, |
| EnsureElementsMode mode); |
| static inline void EnsureCanContainElements(Handle<JSObject> object, |
| Handle<FixedArrayBase> elements, |
| uint32_t length, |
| EnsureElementsMode mode); |
| static void EnsureCanContainElements(Handle<JSObject> object, |
| JavaScriptArguments* arguments, |
| uint32_t arg_count, |
| EnsureElementsMode mode); |
| |
| // Would we convert a fast elements array to dictionary mode given |
| // an access at key? |
| bool WouldConvertToSlowElements(uint32_t index); |
| |
| static const uint32_t kMinAddedElementsCapacity = 16; |
| |
| // Computes the new capacity when expanding the elements of a JSObject. |
| static uint32_t NewElementsCapacity(uint32_t old_capacity) { |
| // (old_capacity + 50%) + kMinAddedElementsCapacity |
| return old_capacity + (old_capacity >> 1) + kMinAddedElementsCapacity; |
| } |
| |
| // These methods do not perform access checks! |
| template <AllocationSiteUpdateMode update_or_check = |
| AllocationSiteUpdateMode::kUpdate> |
| static bool UpdateAllocationSite(Handle<JSObject> object, |
| ElementsKind to_kind); |
| |
| // Lookup interceptors are used for handling properties controlled by host |
| // objects. |
| DECL_GETTER(HasNamedInterceptor, bool) |
| DECL_GETTER(HasIndexedInterceptor, bool) |
| |
| // Support functions for v8 api (needed for correct interceptor behavior). |
| V8_WARN_UNUSED_RESULT static Maybe<bool> HasRealNamedProperty( |
| Isolate* isolate, Handle<JSObject> object, Handle<Name> name); |
| V8_WARN_UNUSED_RESULT static Maybe<bool> HasRealElementProperty( |
| Isolate* isolate, Handle<JSObject> object, uint32_t index); |
| V8_WARN_UNUSED_RESULT static Maybe<bool> HasRealNamedCallbackProperty( |
| Isolate* isolate, Handle<JSObject> object, Handle<Name> name); |
| |
| // Get the header size for a JSObject. Used to compute the index of |
| // embedder fields as well as the number of embedder fields. |
| // The |function_has_prototype_slot| parameter is needed only for |
| // JSFunction objects. |
| static V8_EXPORT_PRIVATE int GetHeaderSize( |
| InstanceType instance_type, bool function_has_prototype_slot = false); |
| static inline int GetHeaderSize(Tagged<Map> map); |
| |
| static inline bool MayHaveEmbedderFields(Tagged<Map> map); |
| inline bool MayHaveEmbedderFields() const; |
| |
| static inline int GetEmbedderFieldsStartOffset(Tagged<Map> map); |
| inline int GetEmbedderFieldsStartOffset(); |
| |
| static inline int GetEmbedderFieldCount(Tagged<Map> map); |
| inline int GetEmbedderFieldCount() const; |
| inline int GetEmbedderFieldOffset(int index); |
| inline Tagged<Object> GetEmbedderField(int index); |
| inline void SetEmbedderField(int index, Tagged<Object> value); |
| inline void SetEmbedderField(int index, Tagged<Smi> value); |
| |
| // Returns true if this object is an Api object which can, if unmodified, be |
| // dropped during minor GC because the embedder can recreate it again later. |
| static inline bool IsDroppableApiObject(Tagged<Map>); |
| inline bool IsDroppableApiObject() const; |
| |
| // Returns a new map with all transitions dropped from the object's current |
| // map and the ElementsKind set. |
| static Handle<Map> GetElementsTransitionMap(Handle<JSObject> object, |
| ElementsKind to_kind); |
| V8_EXPORT_PRIVATE static void TransitionElementsKind(Handle<JSObject> object, |
| ElementsKind to_kind); |
| |
| // Always use this to migrate an object to a new map. |
| // |expected_additional_properties| is only used for fast-to-slow transitions |
| // and ignored otherwise. |
| V8_EXPORT_PRIVATE static void MigrateToMap( |
| Isolate* isolate, Handle<JSObject> object, Handle<Map> new_map, |
| int expected_additional_properties = 0); |
| |
| // Forces a prototype without any of the checks that the regular SetPrototype |
| // would do. |
| static void ForceSetPrototype(Isolate* isolate, Handle<JSObject> object, |
| Handle<HeapObject> proto); |
| |
| // Convert the object to use the canonical dictionary |
| // representation. If the object is expected to have additional properties |
| // added this number can be indicated to have the backing store allocated to |
| // an initial capacity for holding these properties. |
| V8_EXPORT_PRIVATE static void NormalizeProperties( |
| Isolate* isolate, Handle<JSObject> object, PropertyNormalizationMode mode, |
| int expected_additional_properties, bool use_cache, const char* reason); |
| |
| V8_EXPORT_PRIVATE static void NormalizeProperties( |
| Isolate* isolate, Handle<JSObject> object, PropertyNormalizationMode mode, |
| int expected_additional_properties, const char* reason) { |
| const bool kUseCache = true; |
| NormalizeProperties(isolate, object, mode, expected_additional_properties, |
| kUseCache, reason); |
| } |
| |
| // Convert and update the elements backing store to be a |
| // NumberDictionary dictionary. Returns the backing after conversion. |
| V8_EXPORT_PRIVATE static Handle<NumberDictionary> NormalizeElements( |
| Handle<JSObject> object); |
| |
| void RequireSlowElements(Tagged<NumberDictionary> dictionary); |
| |
| // Transform slow named properties to fast variants. |
| V8_EXPORT_PRIVATE static void MigrateSlowToFast(Handle<JSObject> object, |
| int unused_property_fields, |
| const char* reason); |
| |
| // Access property in dictionary mode object at the given dictionary index. |
| static Handle<Object> DictionaryPropertyAt(Isolate* isolate, |
| Handle<JSObject> object, |
| InternalIndex dict_index); |
| // Same as above, but it will return {} if we would be reading out of the |
| // bounds of the object or if the dictionary is pending allocation. Use this |
| // version for concurrent access. |
| static base::Optional<Tagged<Object>> DictionaryPropertyAt( |
| Handle<JSObject> object, InternalIndex dict_index, Heap* heap); |
| |
| // Access fast-case object properties at index. |
| static Handle<Object> FastPropertyAt(Isolate* isolate, |
| Handle<JSObject> object, |
| Representation representation, |
| FieldIndex index); |
| static Handle<Object> FastPropertyAt(Isolate* isolate, |
| Handle<JSObject> object, |
| Representation representation, |
| FieldIndex index, SeqCstAccessTag tag); |
| inline Tagged<Object> RawFastPropertyAt(FieldIndex index) const; |
| inline Tagged<Object> RawFastPropertyAt(PtrComprCageBase cage_base, |
| FieldIndex index) const; |
| inline Tagged<Object> RawFastPropertyAt(FieldIndex index, |
| SeqCstAccessTag tag) const; |
| inline Tagged<Object> RawFastPropertyAt(PtrComprCageBase cage_base, |
| FieldIndex index, |
| SeqCstAccessTag tag) const; |
| |
| // See comment in the body of the method to understand the conditions |
| // in which this method is meant to be used, and what guarantees it |
| // provides against invalid reads from another thread during object |
| // mutation. |
| inline base::Optional<Tagged<Object>> RawInobjectPropertyAt( |
| PtrComprCageBase cage_base, Tagged<Map> original_map, |
| FieldIndex index) const; |
| |
| inline void FastPropertyAtPut(FieldIndex index, Tagged<Object> value, |
| WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
| inline void FastPropertyAtPut(FieldIndex index, Tagged<Object> value, |
| SeqCstAccessTag tag); |
| inline void RawFastInobjectPropertyAtPut( |
| FieldIndex index, Tagged<Object> value, |
| WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
| inline void RawFastInobjectPropertyAtPut(FieldIndex index, |
| Tagged<Object> value, |
| SeqCstAccessTag tag); |
| inline void WriteToField(InternalIndex descriptor, PropertyDetails details, |
| Tagged<Object> value); |
| |
| inline Tagged<Object> RawFastInobjectPropertyAtSwap(FieldIndex index, |
| Tagged<Object> value, |
| SeqCstAccessTag tag); |
| inline Tagged<Object> RawFastPropertyAtSwap(FieldIndex index, |
| Tagged<Object> value, |
| SeqCstAccessTag tag); |
| Tagged<Object> RawFastPropertyAtCompareAndSwap(FieldIndex index, |
| Tagged<Object> expected, |
| Tagged<Object> value, |
| SeqCstAccessTag tag); |
| inline Tagged<Object> RawFastInobjectPropertyAtCompareAndSwap( |
| FieldIndex index, Tagged<Object> expected, Tagged<Object> value, |
| SeqCstAccessTag tag); |
| |
| // Access to in object properties. |
| inline int GetInObjectPropertyOffset(int index); |
| inline Tagged<Object> InObjectPropertyAt(int index); |
| inline Tagged<Object> InObjectPropertyAtPut( |
| int index, Tagged<Object> value, |
| WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
| |
| // Set the object's prototype (only JSReceiver and null are allowed values). |
| V8_WARN_UNUSED_RESULT static Maybe<bool> SetPrototype( |
| Isolate* isolate, Handle<JSObject> object, Handle<Object> value, |
| bool from_javascript, ShouldThrow should_throw); |
| |
| // Makes the object prototype immutable |
| // Never called from JavaScript |
| static void SetImmutableProto(Handle<JSObject> object); |
| |
| // Initializes the body starting at |start_offset|. It is responsibility of |
| // the caller to initialize object header. Fill the pre-allocated fields with |
| // undefined_value and the rest with filler_map. |
| // Note: this call does not update write barrier, the caller is responsible |
| // to ensure that |filler_map| can be collected without WB here. |
| inline void InitializeBody(Tagged<Map> map, int start_offset, |
| bool is_slack_tracking_in_progress, |
| MapWord filler_map, |
| Tagged<Object> undefined_value); |
| |
| // Check whether this object references another object |
| bool ReferencesObject(Tagged<Object> obj); |
| |
| V8_WARN_UNUSED_RESULT static Maybe<bool> TestIntegrityLevel( |
| Isolate* isolate, Handle<JSObject> object, IntegrityLevel lvl); |
| |
| V8_WARN_UNUSED_RESULT static Maybe<bool> PreventExtensions( |
| Isolate* isolate, Handle<JSObject> object, ShouldThrow should_throw); |
| |
| static bool IsExtensible(Isolate* isolate, Handle<JSObject> object); |
| |
| static MaybeHandle<Object> ReadFromOptionsBag(Handle<Object> options, |
| Handle<String> option_name, |
| Isolate* isolate); |
| |
| // Dispatched behavior. |
| void JSObjectShortPrint(StringStream* accumulator); |
| DECL_PRINTER(JSObject) |
| DECL_VERIFIER(JSObject) |
| #ifdef OBJECT_PRINT |
| bool PrintProperties(std::ostream& os); |
| void PrintElements(std::ostream& os); |
| #endif |
| #if defined(DEBUG) || defined(OBJECT_PRINT) |
| void PrintTransitions(std::ostream& os); |
| #endif |
| |
| static void PrintElementsTransition(FILE* file, Handle<JSObject> object, |
| ElementsKind from_kind, |
| Handle<FixedArrayBase> from_elements, |
| ElementsKind to_kind, |
| Handle<FixedArrayBase> to_elements); |
| |
| void PrintInstanceMigration(FILE* file, Tagged<Map> original_map, |
| Tagged<Map> new_map); |
| |
| #ifdef DEBUG |
| // Structure for collecting spill information about JSObjects. |
| class SpillInformation { |
| public: |
| void Clear(); |
| void Print(); |
| int number_of_objects_; |
| int number_of_objects_with_fast_properties_; |
| int number_of_objects_with_fast_elements_; |
| int number_of_fast_used_fields_; |
| int number_of_fast_unused_fields_; |
| int number_of_slow_used_properties_; |
| int number_of_slow_unused_properties_; |
| int number_of_fast_used_elements_; |
| int number_of_fast_unused_elements_; |
| int number_of_slow_used_elements_; |
| int number_of_slow_unused_elements_; |
| }; |
| |
| void IncrementSpillStatistics(Isolate* isolate, SpillInformation* info); |
| #endif |
| |
| #ifdef VERIFY_HEAP |
| // If a GC was caused while constructing this object, the elements pointer |
| // may point to a one pointer filler map. The object won't be rooted, but |
| // our heap verification code could stumble across it. |
| V8_EXPORT_PRIVATE bool ElementsAreSafeToExamine( |
| PtrComprCageBase cage_base) const; |
| #endif |
| |
| Tagged<Object> SlowReverseLookup(Tagged<Object> value); |
| |
| // Maximal number of elements (numbered 0 .. kMaxElementCount - 1). |
| // Also maximal value of JSArray's length property. |
| static constexpr uint32_t kMaxElementCount = kMaxUInt32; |
| static constexpr uint32_t kMaxElementIndex = kMaxElementCount - 1; |
| |
| // Constants for heuristics controlling conversion of fast elements |
| // to slow elements. |
| |
| // Maximal gap that can be introduced by adding an element beyond |
| // the current elements length. |
| static const uint32_t kMaxGap = 1024; |
| |
| // Maximal length of fast elements array that won't be checked for |
| // being dense enough on expansion. |
| static const int kMaxUncheckedFastElementsLength = 5000; |
| |
| // Same as above but for old arrays. This limit is more strict. We |
| // don't want to be wasteful with long lived objects. |
| static const int kMaxUncheckedOldFastElementsLength = 500; |
| |
| // This constant applies only to the initial map of "global.Object" and |
| // not to arbitrary other JSObject maps. |
| static const int kInitialGlobalObjectUnusedPropertiesCount = 4; |
| |
| static const int kMaxInstanceSize = 255 * kTaggedSize; |
| // kMaxInstanceSize in words must fit in one byte. |
| static_assert((kMaxInstanceSize >> kTaggedSizeLog2) <= kMaxUInt8); |
| |
| static const int kMapCacheSize = 128; |
| |
| // When extending the backing storage for property values, we increase |
| // its size by more than the 1 entry necessary, so sequentially adding fields |
| // to the same object requires fewer allocations and copies. |
| static const int kFieldsAdded = 3; |
| static_assert(kMaxNumberOfDescriptors + kFieldsAdded <= |
| PropertyArray::kMaxLength); |
| |
| static_assert(kHeaderSize == Internals::kJSObjectHeaderSize); |
| static const int kMaxInObjectProperties = |
| (kMaxInstanceSize - kHeaderSize) >> kTaggedSizeLog2; |
| static_assert(kMaxInObjectProperties <= kMaxNumberOfDescriptors); |
| |
| static const int kMaxFirstInobjectPropertyOffset = |
| (1 << kFirstInobjectPropertyOffsetBitCount) - 1; |
| static const int kMaxEmbedderFields = |
| (kMaxFirstInobjectPropertyOffset - kHeaderSize) / kEmbedderDataSlotSize; |
| static_assert(kHeaderSize + |
| kMaxEmbedderFields * kEmbedderDataSlotSizeInTaggedSlots <= |
| kMaxInstanceSize); |
| |
| static constexpr int kMaxJSApiObjectInObjectProperties = |
| (kMaxInstanceSize - kHeaderSize - kCppHeapPointerSlotSize) >> |
| kTaggedSizeLog2; |
| static constexpr int kMaxJSApiObjectEmbedderFields = |
| (kMaxFirstInobjectPropertyOffset - kHeaderSize - |
| kCppHeapPointerSlotSize) / |
| kEmbedderDataSlotSize; |
| |
| class BodyDescriptor; |
| |
| class FastBodyDescriptor; |
| |
| // Gets the number of currently used elements. |
| int GetFastElementsUsage(); |
| |
| template <typename Dictionary> |
| static void ApplyAttributesToDictionary(Isolate* isolate, ReadOnlyRoots roots, |
| Handle<Dictionary> dictionary, |
| const PropertyAttributes attributes); |
| |
| private: |
| friend class JSReceiver; |
| friend class Object; |
| |
| // Used from Object::GetProperty(). |
| V8_WARN_UNUSED_RESULT static MaybeHandle<Object> |
| GetPropertyWithFailedAccessCheck(LookupIterator* it); |
| |
| V8_WARN_UNUSED_RESULT static Maybe<bool> SetPropertyWithFailedAccessCheck( |
| LookupIterator* it, Handle<Object> value, |
| Maybe<ShouldThrow> should_throw); |
| |
| V8_WARN_UNUSED_RESULT static Maybe<bool> DeletePropertyWithInterceptor( |
| LookupIterator* it, ShouldThrow should_throw); |
| |
| bool ReferencesObjectFromElements(Tagged<FixedArray> elements, |
| ElementsKind kind, Tagged<Object> object); |
| |
| // Helper for fast versions of preventExtensions, seal, and freeze. |
| // attrs is one of NONE, SEALED, or FROZEN (depending on the operation). |
| template <PropertyAttributes attrs> |
| V8_WARN_UNUSED_RESULT static Maybe<bool> PreventExtensionsWithTransition( |
| Isolate* isolate, Handle<JSObject> object, ShouldThrow should_throw); |
| |
| inline Tagged<Object> RawFastPropertyAtCompareAndSwapInternal( |
| FieldIndex index, Tagged<Object> expected, Tagged<Object> value, |
| SeqCstAccessTag tag); |
| |
| TQ_OBJECT_CONSTRUCTORS(JSObject) |
| }; |
| |
| // A JSObject created through the public api which wraps an external pointer. |
| // See v8::External. |
| class JSExternalObject |
| : public TorqueGeneratedJSExternalObject<JSExternalObject, JSObject> { |
| public: |
| // [value]: field containing the pointer value. |
| DECL_EXTERNAL_POINTER_ACCESSORS(value, void*) |
| |
| static constexpr int kEndOfTaggedFieldsOffset = JSObject::kHeaderSize; |
| |
| DECL_PRINTER(JSExternalObject) |
| |
| class BodyDescriptor; |
| |
| private: |
| TQ_OBJECT_CONSTRUCTORS(JSExternalObject) |
| }; |
| |
| // An abstract superclass for JSObjects that may contain EmbedderDataSlots. |
| class JSObjectWithEmbedderSlots |
| : public TorqueGeneratedJSObjectWithEmbedderSlots<JSObjectWithEmbedderSlots, |
| JSObject> { |
| public: |
| static_assert(kHeaderSize == JSObject::kHeaderSize); |
| TQ_OBJECT_CONSTRUCTORS(JSObjectWithEmbedderSlots) |
| }; |
| |
| // An abstract superclass for JSObjects that may contain EmbedderDataSlots and |
| // are used as API wrapper objects. |
| class JSAPIObjectWithEmbedderSlots |
| : public TorqueGeneratedJSAPIObjectWithEmbedderSlots< |
| JSAPIObjectWithEmbedderSlots, JSObject> { |
| public: |
| class BodyDescriptor; |
| |
| TQ_OBJECT_CONSTRUCTORS(JSAPIObjectWithEmbedderSlots) |
| }; |
| |
| // An abstract superclass for JSObjects that may have elements while having an |
| // empty fixed array as elements backing store. It doesn't carry any |
| // functionality but allows function classes to be identified in the type |
| // system. |
| class JSCustomElementsObject |
| : public TorqueGeneratedJSCustomElementsObject<JSCustomElementsObject, |
| JSObject> { |
| public: |
| static_assert(kHeaderSize == JSObject::kHeaderSize); |
| TQ_OBJECT_CONSTRUCTORS(JSCustomElementsObject) |
| }; |
| |
| // An abstract superclass for JSObjects that require non-standard element |
| // access. It doesn't carry any functionality but allows function classes to be |
| // identified in the type system. |
| // These may also contain EmbedderDataSlots, but can't currently inherit from |
| // JSAPIObjectWithEmbedderSlots due to instance_type constraints. |
| class JSSpecialObject |
| : public TorqueGeneratedJSSpecialObject<JSSpecialObject, |
| JSCustomElementsObject> { |
| public: |
| TQ_OBJECT_CONSTRUCTORS(JSSpecialObject) |
| }; |
| |
| // Helper union that doesn't actually exist as type. Use by value. |
| class JSApiWrapper { |
| public: |
| V8_INLINE explicit JSApiWrapper(Tagged<JSObject> object); |
| |
| template <ExternalPointerTag tag> |
| V8_INLINE void SetCppHeapWrappable(IsolateForPointerCompression isolate, |
| void*); |
| V8_INLINE void SetCppHeapWrappable(IsolateForPointerCompression isolate, |
| void*, ExternalPointerTag tag); |
| template <ExternalPointerTag tag> |
| V8_INLINE void* GetCppHeapWrappable( |
| IsolateForPointerCompression isolate) const; |
| V8_INLINE void* GetCppHeapWrappable(IsolateForPointerCompression isolate, |
| ExternalPointerTag tag) const; |
| |
| private: |
| static_assert(JSAPIObjectWithEmbedderSlots::kCppHeapWrappableOffset == |
| JSSpecialObject::kCppHeapWrappableOffset); |
| static constexpr int kCppHeapWrappableOffset = |
| JSAPIObjectWithEmbedderSlots::kCppHeapWrappableOffset; |
| |
| Tagged<JSObject> object_; |
| }; |
| |
| // JSAccessorPropertyDescriptor is just a JSObject with a specific initial |
| // map. This initial map adds in-object properties for "get", "set", |
| // "enumerable" and "configurable" properties, as assigned by the |
| // FromPropertyDescriptor function for regular accessor properties. |
| class JSAccessorPropertyDescriptor : public JSObject { |
| public: |
| // Layout description. |
| #define JS_ACCESSOR_PROPERTY_DESCRIPTOR_FIELDS(V) \ |
| V(kGetOffset, kTaggedSize) \ |
| V(kSetOffset, kTaggedSize) \ |
| V(kEnumerableOffset, kTaggedSize) \ |
| V(kConfigurableOffset, kTaggedSize) \ |
| /* Total size. */ \ |
| V(kSize, 0) |
| |
| DEFINE_FIELD_OFFSET_CONSTANTS(JSObject::kHeaderSize, |
| JS_ACCESSOR_PROPERTY_DESCRIPTOR_FIELDS) |
| #undef JS_ACCESSOR_PROPERTY_DESCRIPTOR_FIELDS |
| |
| // Indices of in-object properties. |
| static const int kGetIndex = 0; |
| static const int kSetIndex = 1; |
| static const int kEnumerableIndex = 2; |
| static const int kConfigurableIndex = 3; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSAccessorPropertyDescriptor); |
| }; |
| |
| // JSDataPropertyDescriptor is just a JSObject with a specific initial map. |
| // This initial map adds in-object properties for "value", "writable", |
| // "enumerable" and "configurable" properties, as assigned by the |
| // FromPropertyDescriptor function for regular data properties. |
| class JSDataPropertyDescriptor : public JSObject { |
| public: |
| // Layout description. |
| #define JS_DATA_PROPERTY_DESCRIPTOR_FIELDS(V) \ |
| V(kValueOffset, kTaggedSize) \ |
| V(kWritableOffset, kTaggedSize) \ |
| V(kEnumerableOffset, kTaggedSize) \ |
| V(kConfigurableOffset, kTaggedSize) \ |
| /* Total size. */ \ |
| V(kSize, 0) |
| |
| DEFINE_FIELD_OFFSET_CONSTANTS(JSObject::kHeaderSize, |
| JS_DATA_PROPERTY_DESCRIPTOR_FIELDS) |
| #undef JS_DATA_PROPERTY_DESCRIPTOR_FIELDS |
| |
| // Indices of in-object properties. |
| static const int kValueIndex = 0; |
| static const int kWritableIndex = 1; |
| static const int kEnumerableIndex = 2; |
| static const int kConfigurableIndex = 3; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSDataPropertyDescriptor); |
| }; |
| |
| // JSIteratorResult is just a JSObject with a specific initial map. |
| // This initial map adds in-object properties for "done" and "value", |
| // as specified by ES6 section 25.1.1.3 The IteratorResult Interface. |
| class JSIteratorResult : public JSObject { |
| public: |
| DECL_ACCESSORS(value, Tagged<Object>) |
| |
| DECL_ACCESSORS(done, Tagged<Object>) |
| |
| // Layout description. |
| #define JS_ITERATOR_RESULT_FIELDS(V) \ |
| V(kValueOffset, kTaggedSize) \ |
| V(kDoneOffset, kTaggedSize) \ |
| /* Total size. */ \ |
| V(kSize, 0) |
| |
| DEFINE_FIELD_OFFSET_CONSTANTS(JSObject::kHeaderSize, |
| JS_ITERATOR_RESULT_FIELDS) |
| #undef JS_ITERATOR_RESULT_FIELDS |
| |
| // Indices of in-object properties. |
| static const int kValueIndex = 0; |
| static const int kDoneIndex = 1; |
| |
| DECL_CAST(JSIteratorResult) |
| |
| OBJECT_CONSTRUCTORS(JSIteratorResult, JSObject); |
| }; |
| |
| // JSGlobalProxy's prototype must be a JSGlobalObject or null, |
| // and the prototype is hidden. JSGlobalProxy always delegates |
| // property accesses to its prototype if the prototype is not null. |
| // |
| // A JSGlobalProxy can be reinitialized which will preserve its identity. |
| // |
| // Accessing a JSGlobalProxy requires security check. |
| |
| class JSGlobalProxy |
| : public TorqueGeneratedJSGlobalProxy<JSGlobalProxy, JSSpecialObject> { |
| public: |
| inline bool IsDetachedFrom(Tagged<JSGlobalObject> global) const; |
| V8_EXPORT_PRIVATE bool IsDetached(); |
| |
| static int SizeWithEmbedderFields(int embedder_field_count); |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSGlobalProxy) |
| DECL_VERIFIER(JSGlobalProxy) |
| |
| TQ_OBJECT_CONSTRUCTORS(JSGlobalProxy) |
| }; |
| |
| // JavaScript global object. |
| class JSGlobalObject |
| : public TorqueGeneratedJSGlobalObject<JSGlobalObject, JSSpecialObject> { |
| public: |
| DECL_RELEASE_ACQUIRE_ACCESSORS(global_dictionary, Tagged<GlobalDictionary>) |
| |
| static void InvalidatePropertyCell(Handle<JSGlobalObject> object, |
| Handle<Name> name); |
| |
| inline bool IsDetached(); |
| inline Tagged<NativeContext> native_context(); |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSGlobalObject) |
| DECL_VERIFIER(JSGlobalObject) |
| |
| TQ_OBJECT_CONSTRUCTORS(JSGlobalObject) |
| }; |
| |
| // Representation for JS Wrapper objects, String, Number, Boolean, etc. |
| class JSPrimitiveWrapper |
| : public TorqueGeneratedJSPrimitiveWrapper<JSPrimitiveWrapper, |
| JSCustomElementsObject> { |
| public: |
| // Dispatched behavior. |
| DECL_PRINTER(JSPrimitiveWrapper) |
| |
| TQ_OBJECT_CONSTRUCTORS(JSPrimitiveWrapper) |
| }; |
| |
| class DateCache; |
| |
| // Representation for JS date objects. |
| class JSDate : public TorqueGeneratedJSDate<JSDate, JSObject> { |
| public: |
| static V8_WARN_UNUSED_RESULT MaybeHandle<JSDate> New( |
| Handle<JSFunction> constructor, Handle<JSReceiver> new_target, double tv); |
| |
| // Returns the time value (UTC) identifying the current time in milliseconds. |
| static int64_t CurrentTimeValue(Isolate* isolate); |
| |
| // Returns the date field with the specified index. |
| // See FieldIndex for the list of date fields. |
| // Arguments and result are raw Address values because this is called |
| // via ExternalReference. |
| // {raw_date} is a tagged Object pointer. |
| // {smi_index} is a tagged Smi. |
| // The return value is a tagged Object pointer. |
| static Address GetField(Isolate* isolate, Address raw_date, |
| Address smi_index); |
| |
| static Handle<Object> SetValue(Handle<JSDate> date, double v); |
| |
| void SetValue(Tagged<Object> value, bool is_value_nan); |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSDate) |
| DECL_VERIFIER(JSDate) |
| |
| // The order is important. It must be kept in sync with date macros |
| // in macros.py. |
| enum FieldIndex { |
| kDateValue, |
| kYear, |
| kMonth, |
| kDay, |
| kWeekday, |
| kHour, |
| kMinute, |
| kSecond, |
| kFirstUncachedField, |
| kMillisecond = kFirstUncachedField, |
| kDays, |
| kTimeInDay, |
| kFirstUTCField, |
| kYearUTC = kFirstUTCField, |
| kMonthUTC, |
| kDayUTC, |
| kWeekdayUTC, |
| kHourUTC, |
| kMinuteUTC, |
| kSecondUTC, |
| kMillisecondUTC, |
| kDaysUTC, |
| kTimeInDayUTC, |
| kTimezoneOffset |
| }; |
| |
| private: |
| Tagged<Object> DoGetField(Isolate* isolate, FieldIndex index); |
| Tagged<Object> GetUTCField(FieldIndex index, double value, |
| DateCache* date_cache); |
| |
| // Computes and caches the cacheable fields of the date. |
| inline void SetCachedFields(int64_t local_time_ms, DateCache* date_cache); |
| |
| TQ_OBJECT_CONSTRUCTORS(JSDate) |
| }; |
| |
| // Representation of message objects used for error reporting through |
| // the API. The messages are formatted in JavaScript so this object is |
| // a real JavaScript object. The information used for formatting the |
| // error messages are not directly accessible from JavaScript to |
| // prevent leaking information to user code called during error |
| // formatting. |
| class JSMessageObject |
| : public TorqueGeneratedJSMessageObject<JSMessageObject, JSObject> { |
| public: |
| // [type]: the type of error message. |
| inline MessageTemplate type() const; |
| inline void set_type(MessageTemplate value); |
| |
| // Initializes the source positions in the object if possible. Does nothing if |
| // called more than once. If called when stack space is exhausted, then the |
| // source positions will be not be set and calling it again when there is more |
| // stack space will not have any effect. |
| static inline void EnsureSourcePositionsAvailable( |
| Isolate* isolate, Handle<JSMessageObject> message); |
| |
| // Gets the start and end positions for the message. |
| // EnsureSourcePositionsAvailable must have been called before calling these. |
| inline int GetStartPosition() const; |
| inline int GetEndPosition() const; |
| |
| // Returns the line number for the error message (1-based), or |
| // Message::kNoLineNumberInfo if the line cannot be determined. |
| // EnsureSourcePositionsAvailable must have been called before calling this. |
| V8_EXPORT_PRIVATE int GetLineNumber() const; |
| |
| // Returns the offset of the given position within the containing line. |
| // EnsureSourcePositionsAvailable must have been called before calling this. |
| V8_EXPORT_PRIVATE int GetColumnNumber() const; |
| |
| // Returns the source code |
| V8_EXPORT_PRIVATE Tagged<String> GetSource() const; |
| |
| // Returns the source code line containing the given source |
| // position, or the empty string if the position is invalid. |
| // EnsureSourcePositionsAvailable must have been called before calling this. |
| Handle<String> GetSourceLine() const; |
| |
| DECL_INT_ACCESSORS(error_level) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSMessageObject) |
| |
| // TODO(v8:8989): [torque] Support marker constants. |
| static const int kPointerFieldsEndOffset = kStartPositionOffset; |
| |
| using BodyDescriptor = |
| FixedBodyDescriptor<HeapObject::kMapOffset, kPointerFieldsEndOffset, |
| kHeaderSize>; |
| |
| private: |
| friend class Factory; |
| |
| inline bool DidEnsureSourcePositionsAvailable() const; |
| static void V8_PRESERVE_MOST V8_EXPORT_PRIVATE |
| InitializeSourcePositions(Isolate* isolate, Handle<JSMessageObject> message); |
| |
| // [shared]: optional SharedFunctionInfo that can be used to reconstruct the |
| // source position if not available when the message was generated. |
| DECL_ACCESSORS(shared_info, Tagged<Object>) |
| |
| // [bytecode_offset]: optional offset using along with |shared| to generation |
| // source positions. |
| DECL_ACCESSORS(bytecode_offset, Tagged<Smi>) |
| |
| // [start_position]: the start position in the script for the error message. |
| DECL_INT_ACCESSORS(start_position) |
| |
| // [end_position]: the end position in the script for the error message. |
| DECL_INT_ACCESSORS(end_position) |
| |
| DECL_INT_ACCESSORS(raw_type) |
| |
| // Hide generated accessors; custom accessors are named "raw_type". |
| DECL_INT_ACCESSORS(message_type) |
| |
| TQ_OBJECT_CONSTRUCTORS(JSMessageObject) |
| }; |
| |
| // The [Async-from-Sync Iterator] object |
| // (proposal-async-iteration/#sec-async-from-sync-iterator-objects) |
| // An object which wraps an ordinary Iterator and converts it to behave |
| // according to the Async Iterator protocol. |
| // (See https://tc39.github.io/proposal-async-iteration/#sec-iteration) |
| class JSAsyncFromSyncIterator |
| : public TorqueGeneratedJSAsyncFromSyncIterator<JSAsyncFromSyncIterator, |
| JSObject> { |
| public: |
| DECL_PRINTER(JSAsyncFromSyncIterator) |
| |
| // Async-from-Sync Iterator instances are ordinary objects that inherit |
| // properties from the %AsyncFromSyncIteratorPrototype% intrinsic object. |
| // Async-from-Sync Iterator instances are initially created with the internal |
| // slots listed in Table 4. |
| // (proposal-async-iteration/#table-async-from-sync-iterator-internal-slots) |
| |
| TQ_OBJECT_CONSTRUCTORS(JSAsyncFromSyncIterator) |
| }; |
| |
| class JSStringIterator |
| : public TorqueGeneratedJSStringIterator<JSStringIterator, JSObject> { |
| public: |
| // Dispatched behavior. |
| DECL_PRINTER(JSStringIterator) |
| DECL_VERIFIER(JSStringIterator) |
| |
| TQ_OBJECT_CONSTRUCTORS(JSStringIterator) |
| }; |
| |
| // The valid iterator wrapper is the wrapper object created by |
| // Iterator.from(obj), which attempts to wrap iterator-like objects into an |
| // actual iterator with %Iterator.prototype%. |
| class JSValidIteratorWrapper |
| : public TorqueGeneratedJSValidIteratorWrapper<JSValidIteratorWrapper, |
| JSObject> { |
| public: |
| DECL_PRINTER(JSValidIteratorWrapper) |
| |
| TQ_OBJECT_CONSTRUCTORS(JSValidIteratorWrapper) |
| }; |
| |
| // JSPromiseWithResolversResult is just a JSObject with a specific initial map. |
| // This initial map adds in-object properties for "promise", "resolve", and |
| // "reject", in that order. |
| class JSPromiseWithResolversResult : public JSObject { |
| public: |
| DECL_ACCESSORS(promise, Tagged<Object>) |
| |
| DECL_ACCESSORS(resolve, Tagged<Object>) |
| |
| DECL_ACCESSORS(reject, Tagged<Object>) |
| |
| // Layout description. |
| #define JS_PROMISE_WITHRESOLVERS_RESULT_FIELDS(V) \ |
| V(kPromiseOffset, kTaggedSize) \ |
| V(kResolveOffset, kTaggedSize) \ |
| V(kRejectOffset, kTaggedSize) \ |
| /* Total size. */ \ |
| V(kSize, 0) |
| |
| DEFINE_FIELD_OFFSET_CONSTANTS(JSObject::kHeaderSize, |
| JS_PROMISE_WITHRESOLVERS_RESULT_FIELDS) |
| #undef JS_PROMISE_WITHRESOLVERS_RESULT_FIELDS |
| |
| // Indices of in-object properties. |
| static const int kPromiseIndex = 0; |
| static const int kResolveIndex = 1; |
| static const int kRejectIndex = 2; |
| |
| DECL_CAST(JSPromiseWithResolversResult) |
| |
| OBJECT_CONSTRUCTORS(JSPromiseWithResolversResult, JSObject); |
| }; |
| |
| } // namespace internal |
| } // namespace v8 |
| |
| #include "src/objects/object-macros-undef.h" |
| |
| #endif // V8_OBJECTS_JS_OBJECTS_H_ |
