// Copyright 2019 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. bitfield struct MapBitFields1 extends uint8 { has_non_instance_prototype: bool: 1 bit; is_callable: bool: 1 bit; has_named_interceptor: bool: 1 bit; has_indexed_interceptor: bool: 1 bit; is_undetectable: bool: 1 bit; is_access_check_needed: bool: 1 bit; is_constructor: bool: 1 bit; has_prototype_slot: bool: 1 bit; } bitfield struct MapBitFields2 extends uint8 { new_target_is_base: bool: 1 bit; is_immutable_prototype: bool: 1 bit; unused: bool: 1 bit; elements_kind: ElementsKind: 5 bit; } bitfield struct MapBitFields3 extends uint32 { enum_length: int32: 10 bit; number_of_own_descriptors: int32: 10 bit; is_prototype_map: bool: 1 bit; is_dictionary_map: bool: 1 bit; owns_descriptors: bool: 1 bit; is_in_retained_map_list: bool: 1 bit; is_deprecated: bool: 1 bit; is_unstable: bool: 1 bit; is_migration_target: bool: 1 bit; is_extensible: bool: 1 bit; may_have_interesting_symbols: bool: 1 bit; construction_counter: int32: 3 bit; } extern class Map extends HeapObject { macro PrototypeInfo(): PrototypeInfo labels HasNoPrototypeInfo { typeswitch (this.transitions_or_prototype_info) { case (Weak<Map>): { goto HasNoPrototypeInfo; } case (Smi): { goto HasNoPrototypeInfo; } case (info: PrototypeInfo): { return info; } case (Map | TransitionArray): { goto HasNoPrototypeInfo; } } } instance_size_in_words: uint8; in_object_properties_start_or_constructor_function_index: uint8; used_or_unused_instance_size_in_words: uint8; visitor_id: uint8; instance_type: InstanceType; bit_field: MapBitFields1; bit_field2: MapBitFields2; bit_field3: MapBitFields3; @if(TAGGED_SIZE_8_BYTES) optional_padding: uint32; @ifnot(TAGGED_SIZE_8_BYTES) optional_padding: void; prototype: JSReceiver|Null; constructor_or_back_pointer_or_native_context: Object; instance_descriptors: DescriptorArray; @if(V8_DOUBLE_FIELDS_UNBOXING) layout_descriptor: LayoutDescriptor; @ifnot(V8_DOUBLE_FIELDS_UNBOXING) layout_descriptor: void; dependent_code: DependentCode; prototype_validity_cell: Smi|Cell; weak transitions_or_prototype_info: Map|Weak<Map>|TransitionArray| PrototypeInfo|Smi; } @export macro LoadMapPrototypeInfo(m: Map): PrototypeInfo labels HasNoPrototypeInfo { return m.PrototypeInfo() otherwise HasNoPrototypeInfo; } // Returns true if the map corresponds to non-special fast or dictionary // object. @export macro IsSimpleObjectMap(map: Map): bool { if (IsSpecialReceiverInstanceType(map.instance_type)) { return false; } const bitField = map.bit_field; return !bitField.has_named_interceptor & !bitField.is_access_check_needed; } extern macro IsSpecialReceiverInstanceType(InstanceType): bool;