| // Copyright 2015 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_COMPILER_ACCESS_INFO_H_ |
| #define V8_COMPILER_ACCESS_INFO_H_ |
| |
| #include <iosfwd> |
| |
| #include "src/codegen/machine-type.h" |
| #include "src/compiler/types.h" |
| #include "src/objects/feedback-vector.h" |
| #include "src/objects/field-index.h" |
| #include "src/objects/map.h" |
| #include "src/objects/objects.h" |
| #include "src/zone/zone-containers.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // Forward declarations. |
| class Factory; |
| |
| namespace compiler { |
| |
| // Forward declarations. |
| class CompilationDependencies; |
| class CompilationDependency; |
| class ElementAccessFeedback; |
| class JSHeapBroker; |
| class MinimorphicLoadPropertyAccessFeedback; |
| class TypeCache; |
| struct ConstFieldInfo; |
| |
| std::ostream& operator<<(std::ostream&, AccessMode); |
| |
| // This class encapsulates all information required to access a certain element. |
| class ElementAccessInfo final { |
| public: |
| ElementAccessInfo(ZoneVector<Handle<Map>>&& lookup_start_object_maps, |
| ElementsKind elements_kind, Zone* zone); |
| |
| ElementsKind elements_kind() const { return elements_kind_; } |
| ZoneVector<Handle<Map>> const& lookup_start_object_maps() const { |
| return lookup_start_object_maps_; |
| } |
| ZoneVector<Handle<Map>> const& transition_sources() const { |
| return transition_sources_; |
| } |
| |
| void AddTransitionSource(Handle<Map> map) { |
| CHECK_EQ(lookup_start_object_maps_.size(), 1); |
| transition_sources_.push_back(map); |
| } |
| |
| private: |
| ElementsKind elements_kind_; |
| ZoneVector<Handle<Map>> lookup_start_object_maps_; |
| ZoneVector<Handle<Map>> transition_sources_; |
| }; |
| |
| // This class encapsulates all information required to access a certain |
| // object property, either on the object itself or on the prototype chain. |
| class PropertyAccessInfo final { |
| public: |
| enum Kind { |
| kInvalid, |
| kNotFound, |
| kDataField, |
| kDataConstant, |
| kAccessorConstant, |
| kModuleExport, |
| kStringLength |
| }; |
| |
| static PropertyAccessInfo NotFound(Zone* zone, Handle<Map> receiver_map, |
| MaybeHandle<JSObject> holder); |
| static PropertyAccessInfo DataField( |
| Zone* zone, Handle<Map> receiver_map, |
| ZoneVector<CompilationDependency const*>&& unrecorded_dependencies, |
| FieldIndex field_index, Representation field_representation, |
| Type field_type, Handle<Map> field_owner_map, |
| MaybeHandle<Map> field_map = MaybeHandle<Map>(), |
| MaybeHandle<JSObject> holder = MaybeHandle<JSObject>(), |
| MaybeHandle<Map> transition_map = MaybeHandle<Map>()); |
| static PropertyAccessInfo DataConstant( |
| Zone* zone, Handle<Map> receiver_map, |
| ZoneVector<CompilationDependency const*>&& unrecorded_dependencies, |
| FieldIndex field_index, Representation field_representation, |
| Type field_type, Handle<Map> field_owner_map, MaybeHandle<Map> field_map, |
| MaybeHandle<JSObject> holder, |
| MaybeHandle<Map> transition_map = MaybeHandle<Map>()); |
| static PropertyAccessInfo AccessorConstant(Zone* zone, |
| Handle<Map> receiver_map, |
| Handle<Object> constant, |
| MaybeHandle<JSObject> holder); |
| static PropertyAccessInfo ModuleExport(Zone* zone, Handle<Map> receiver_map, |
| Handle<Cell> cell); |
| static PropertyAccessInfo StringLength(Zone* zone, Handle<Map> receiver_map); |
| static PropertyAccessInfo Invalid(Zone* zone); |
| |
| bool Merge(PropertyAccessInfo const* that, AccessMode access_mode, |
| Zone* zone) V8_WARN_UNUSED_RESULT; |
| |
| void RecordDependencies(CompilationDependencies* dependencies); |
| |
| bool IsInvalid() const { return kind() == kInvalid; } |
| bool IsNotFound() const { return kind() == kNotFound; } |
| bool IsDataField() const { return kind() == kDataField; } |
| bool IsDataConstant() const { return kind() == kDataConstant; } |
| bool IsAccessorConstant() const { return kind() == kAccessorConstant; } |
| bool IsModuleExport() const { return kind() == kModuleExport; } |
| bool IsStringLength() const { return kind() == kStringLength; } |
| |
| bool HasTransitionMap() const { return !transition_map().is_null(); } |
| ConstFieldInfo GetConstFieldInfo() const; |
| |
| Kind kind() const { return kind_; } |
| MaybeHandle<JSObject> holder() const { |
| // TODO(neis): There was a CHECK here that tries to protect against |
| // using the access info without recording its dependencies first. |
| // Find a more suitable place for it. |
| return holder_; |
| } |
| MaybeHandle<Map> transition_map() const { return transition_map_; } |
| Handle<Object> constant() const { return constant_; } |
| FieldIndex field_index() const { return field_index_; } |
| Type field_type() const { return field_type_; } |
| Representation field_representation() const { return field_representation_; } |
| MaybeHandle<Map> field_map() const { return field_map_; } |
| ZoneVector<Handle<Map>> const& lookup_start_object_maps() const { |
| return lookup_start_object_maps_; |
| } |
| |
| private: |
| explicit PropertyAccessInfo(Zone* zone); |
| PropertyAccessInfo(Zone* zone, Kind kind, MaybeHandle<JSObject> holder, |
| ZoneVector<Handle<Map>>&& lookup_start_object_maps); |
| PropertyAccessInfo(Zone* zone, Kind kind, MaybeHandle<JSObject> holder, |
| Handle<Object> constant, |
| ZoneVector<Handle<Map>>&& lookup_start_object_maps); |
| PropertyAccessInfo(Kind kind, MaybeHandle<JSObject> holder, |
| MaybeHandle<Map> transition_map, FieldIndex field_index, |
| Representation field_representation, Type field_type, |
| Handle<Map> field_owner_map, MaybeHandle<Map> field_map, |
| ZoneVector<Handle<Map>>&& lookup_start_object_maps, |
| ZoneVector<CompilationDependency const*>&& dependencies); |
| |
| Kind kind_; |
| ZoneVector<Handle<Map>> lookup_start_object_maps_; |
| ZoneVector<CompilationDependency const*> unrecorded_dependencies_; |
| Handle<Object> constant_; |
| MaybeHandle<Map> transition_map_; |
| MaybeHandle<JSObject> holder_; |
| FieldIndex field_index_; |
| Representation field_representation_; |
| Type field_type_; |
| MaybeHandle<Map> field_owner_map_; |
| MaybeHandle<Map> field_map_; |
| }; |
| |
| // This class encapsulates information required to generate load properties |
| // by only using the information from handlers. This information is used with |
| // dynamic map checks. |
| class MinimorphicLoadPropertyAccessInfo final { |
| public: |
| enum Kind { kInvalid, kDataField }; |
| static MinimorphicLoadPropertyAccessInfo DataField( |
| int offset, bool is_inobject, Representation field_representation, |
| Type field_type); |
| static MinimorphicLoadPropertyAccessInfo Invalid(); |
| |
| bool IsInvalid() const { return kind_ == kInvalid; } |
| bool IsDataField() const { return kind_ == kDataField; } |
| int offset() const { return offset_; } |
| int is_inobject() const { return is_inobject_; } |
| Type field_type() const { return field_type_; } |
| Representation field_representation() const { return field_representation_; } |
| |
| private: |
| MinimorphicLoadPropertyAccessInfo(Kind kind, int offset, bool is_inobject, |
| Representation field_representation, |
| Type field_type); |
| |
| Kind kind_; |
| bool is_inobject_; |
| int offset_; |
| Representation field_representation_; |
| Type field_type_; |
| }; |
| |
| // Factory class for {ElementAccessInfo}s and {PropertyAccessInfo}s. |
| class AccessInfoFactory final { |
| public: |
| AccessInfoFactory(JSHeapBroker* broker, CompilationDependencies* dependencies, |
| Zone* zone); |
| |
| base::Optional<ElementAccessInfo> ComputeElementAccessInfo( |
| Handle<Map> map, AccessMode access_mode) const; |
| bool ComputeElementAccessInfos( |
| ElementAccessFeedback const& feedback, |
| ZoneVector<ElementAccessInfo>* access_infos) const; |
| |
| PropertyAccessInfo ComputePropertyAccessInfo(Handle<Map> map, |
| Handle<Name> name, |
| AccessMode access_mode) const; |
| |
| MinimorphicLoadPropertyAccessInfo ComputePropertyAccessInfo( |
| MinimorphicLoadPropertyAccessFeedback const& feedback) const; |
| |
| // Convenience wrapper around {ComputePropertyAccessInfo} for multiple maps. |
| void ComputePropertyAccessInfos( |
| MapHandles const& maps, Handle<Name> name, AccessMode access_mode, |
| ZoneVector<PropertyAccessInfo>* access_infos) const; |
| |
| // Merge as many of the given {infos} as possible and record any dependencies. |
| // Return false iff any of them was invalid, in which case no dependencies are |
| // recorded. |
| // TODO(neis): Make access_mode part of access info? |
| bool FinalizePropertyAccessInfos( |
| ZoneVector<PropertyAccessInfo> infos, AccessMode access_mode, |
| ZoneVector<PropertyAccessInfo>* result) const; |
| |
| // Merge the given {infos} to a single one and record any dependencies. If the |
| // merge is not possible, the result has kind {kInvalid} and no dependencies |
| // are recorded. |
| PropertyAccessInfo FinalizePropertyAccessInfosAsOne( |
| ZoneVector<PropertyAccessInfo> infos, AccessMode access_mode) const; |
| |
| private: |
| base::Optional<ElementAccessInfo> ConsolidateElementLoad( |
| ElementAccessFeedback const& feedback) const; |
| PropertyAccessInfo LookupSpecialFieldAccessor(Handle<Map> map, |
| Handle<Name> name) const; |
| PropertyAccessInfo LookupTransition(Handle<Map> map, Handle<Name> name, |
| MaybeHandle<JSObject> holder) const; |
| PropertyAccessInfo ComputeDataFieldAccessInfo(Handle<Map> receiver_map, |
| Handle<Map> map, |
| MaybeHandle<JSObject> holder, |
| InternalIndex descriptor, |
| AccessMode access_mode) const; |
| PropertyAccessInfo ComputeAccessorDescriptorAccessInfo( |
| Handle<Map> receiver_map, Handle<Name> name, Handle<Map> map, |
| MaybeHandle<JSObject> holder, InternalIndex descriptor, |
| AccessMode access_mode) const; |
| |
| void MergePropertyAccessInfos(ZoneVector<PropertyAccessInfo> infos, |
| AccessMode access_mode, |
| ZoneVector<PropertyAccessInfo>* result) const; |
| |
| CompilationDependencies* dependencies() const { return dependencies_; } |
| JSHeapBroker* broker() const { return broker_; } |
| Isolate* isolate() const; |
| Zone* zone() const { return zone_; } |
| |
| JSHeapBroker* const broker_; |
| CompilationDependencies* const dependencies_; |
| TypeCache const* const type_cache_; |
| Zone* const zone_; |
| |
| // TODO(nicohartmann@): Move to public |
| AccessInfoFactory(const AccessInfoFactory&) = delete; |
| AccessInfoFactory& operator=(const AccessInfoFactory&) = delete; |
| }; |
| |
| } // namespace compiler |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_COMPILER_ACCESS_INFO_H_ |
