LCOV - code coverage report
Current view: top level - src/compiler - access-info.h (source / functions) Hit Total Coverage
Test: app.info Lines: 9 9 100.0 %
Date: 2019-02-19 Functions: 9 10 90.0 %

          Line data    Source code
       1             : // Copyright 2015 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #ifndef V8_COMPILER_ACCESS_INFO_H_
       6             : #define V8_COMPILER_ACCESS_INFO_H_
       7             : 
       8             : #include <iosfwd>
       9             : 
      10             : #include "src/compiler/types.h"
      11             : #include "src/field-index.h"
      12             : #include "src/machine-type.h"
      13             : #include "src/objects.h"
      14             : #include "src/objects/map.h"
      15             : #include "src/zone/zone-containers.h"
      16             : 
      17             : namespace v8 {
      18             : namespace internal {
      19             : 
      20             : // Forward declarations.
      21             : class Factory;
      22             : 
      23             : namespace compiler {
      24             : 
      25             : // Forward declarations.
      26             : class CompilationDependencies;
      27             : class Type;
      28             : class TypeCache;
      29             : 
      30             : // Whether we are loading a property or storing to a property.
      31             : // For a store during literal creation, do not walk up the prototype chain.
      32             : enum class AccessMode { kLoad, kStore, kStoreInLiteral };
      33             : 
      34             : std::ostream& operator<<(std::ostream&, AccessMode);
      35             : 
      36             : // This class encapsulates all information required to access a certain element.
      37      299036 : class ElementAccessInfo final {
      38             :  public:
      39             :   ElementAccessInfo();
      40             :   ElementAccessInfo(MapHandles const& receiver_maps,
      41             :                     ElementsKind elements_kind);
      42             : 
      43             :   ElementsKind elements_kind() const { return elements_kind_; }
      44             :   MapHandles const& receiver_maps() const { return receiver_maps_; }
      45             :   MapHandles const& transition_sources() const { return transition_sources_; }
      46             : 
      47         545 :   void AddTransitionSource(Handle<Map> map) {
      48        1090 :     CHECK_EQ(receiver_maps_.size(), 1);
      49         545 :     transition_sources_.push_back(map);
      50         545 :   }
      51             : 
      52             :  private:
      53             :   ElementsKind elements_kind_;
      54             :   MapHandles receiver_maps_;
      55             :   MapHandles transition_sources_;
      56             : };
      57             : 
      58             : // This class encapsulates all information required to access a certain
      59             : // object property, either on the object itself or on the prototype chain.
      60      696538 : class PropertyAccessInfo final {
      61             :  public:
      62             :   enum Kind {
      63             :     kInvalid,
      64             :     kNotFound,
      65             :     kDataConstant,
      66             :     kDataField,
      67             :     kDataConstantField,
      68             :     kAccessorConstant,
      69             :     kModuleExport,
      70             :     kStringLength
      71             :   };
      72             : 
      73             :   static PropertyAccessInfo NotFound(MapHandles const& receiver_maps,
      74             :                                      MaybeHandle<JSObject> holder);
      75             :   static PropertyAccessInfo DataConstant(MapHandles const& receiver_maps,
      76             :                                          Handle<Object> constant,
      77             :                                          MaybeHandle<JSObject> holder);
      78             :   static PropertyAccessInfo DataField(
      79             :       PropertyConstness constness, MapHandles const& receiver_maps,
      80             :       FieldIndex field_index, MachineRepresentation field_representation,
      81             :       Type field_type, MaybeHandle<Map> field_map = MaybeHandle<Map>(),
      82             :       MaybeHandle<JSObject> holder = MaybeHandle<JSObject>(),
      83             :       MaybeHandle<Map> transition_map = MaybeHandle<Map>());
      84             :   static PropertyAccessInfo AccessorConstant(MapHandles const& receiver_maps,
      85             :                                              Handle<Object> constant,
      86             :                                              MaybeHandle<JSObject> holder);
      87             :   static PropertyAccessInfo ModuleExport(MapHandles const& receiver_maps,
      88             :                                          Handle<Cell> cell);
      89             :   static PropertyAccessInfo StringLength(MapHandles const& receiver_maps);
      90             : 
      91             :   PropertyAccessInfo();
      92             : 
      93             :   bool Merge(PropertyAccessInfo const* that, AccessMode access_mode,
      94             :              Zone* zone) V8_WARN_UNUSED_RESULT;
      95             : 
      96      106899 :   bool IsNotFound() const { return kind() == kNotFound; }
      97       29257 :   bool IsDataConstant() const { return kind() == kDataConstant; }
      98             :   bool IsDataField() const { return kind() == kDataField; }
      99             :   // TODO(ishell): rename to IsDataConstant() once constant field tracking
     100             :   // is done.
     101       97612 :   bool IsDataConstantField() const { return kind() == kDataConstantField; }
     102             :   bool IsAccessorConstant() const { return kind() == kAccessorConstant; }
     103             :   bool IsModuleExport() const { return kind() == kModuleExport; }
     104             :   bool IsStringLength() const { return kind() == kStringLength; }
     105             : 
     106             :   bool HasTransitionMap() const { return !transition_map().is_null(); }
     107             : 
     108             :   Kind kind() const { return kind_; }
     109             :   MaybeHandle<JSObject> holder() const { return holder_; }
     110             :   MaybeHandle<Map> transition_map() const { return transition_map_; }
     111             :   Handle<Object> constant() const { return constant_; }
     112             :   FieldIndex field_index() const { return field_index_; }
     113             :   Type field_type() const { return field_type_; }
     114             :   MachineRepresentation field_representation() const {
     115             :     return field_representation_;
     116             :   }
     117             :   MaybeHandle<Map> field_map() const { return field_map_; }
     118             :   MapHandles const& receiver_maps() const { return receiver_maps_; }
     119             :   Handle<Cell> export_cell() const;
     120             : 
     121             :  private:
     122             :   PropertyAccessInfo(Kind kind, MaybeHandle<JSObject> holder,
     123             :                      MapHandles const& receiver_maps);
     124             :   PropertyAccessInfo(Kind kind, MaybeHandle<JSObject> holder,
     125             :                      Handle<Object> constant, MapHandles const& receiver_maps);
     126             :   PropertyAccessInfo(Kind kind, MaybeHandle<JSObject> holder,
     127             :                      MaybeHandle<Map> transition_map, FieldIndex field_index,
     128             :                      MachineRepresentation field_representation,
     129             :                      Type field_type, MaybeHandle<Map> field_map,
     130             :                      MapHandles const& receiver_maps);
     131             : 
     132             :   Kind kind_;
     133             :   MapHandles receiver_maps_;
     134             :   Handle<Object> constant_;
     135             :   MaybeHandle<Map> transition_map_;
     136             :   MaybeHandle<JSObject> holder_;
     137             :   FieldIndex field_index_;
     138             :   MachineRepresentation field_representation_;
     139             :   Type field_type_;
     140             :   MaybeHandle<Map> field_map_;
     141             : };
     142             : 
     143             : 
     144             : // Factory class for {ElementAccessInfo}s and {PropertyAccessInfo}s.
     145             : class AccessInfoFactory final {
     146             :  public:
     147             :   AccessInfoFactory(JSHeapBroker* broker, CompilationDependencies* dependencies,
     148             :                     Handle<Context> native_context, Zone* zone);
     149             : 
     150             :   bool ComputeElementAccessInfo(Handle<Map> map, AccessMode access_mode,
     151             :                                 ElementAccessInfo* access_info) const;
     152             :   bool ComputeElementAccessInfos(
     153             :       MapHandles const& maps, AccessMode access_mode,
     154             :       ZoneVector<ElementAccessInfo>* access_infos) const;
     155             : 
     156             :   bool ComputePropertyAccessInfo(Handle<Map> map, Handle<Name> name,
     157             :                                  AccessMode access_mode,
     158             :                                  PropertyAccessInfo* access_info) const;
     159             :   bool ComputePropertyAccessInfo(MapHandles const& maps, Handle<Name> name,
     160             :                                  AccessMode access_mode,
     161             :                                  PropertyAccessInfo* access_info) const;
     162             :   bool ComputePropertyAccessInfos(
     163             :       MapHandles const& maps, Handle<Name> name, AccessMode access_mode,
     164             :       ZoneVector<PropertyAccessInfo>* access_infos) const;
     165             : 
     166             :  private:
     167             :   bool ConsolidateElementLoad(MapHandles const& maps,
     168             :                               ElementAccessInfo* access_info) const;
     169             :   bool LookupSpecialFieldAccessor(Handle<Map> map, Handle<Name> name,
     170             :                                   PropertyAccessInfo* access_info) const;
     171             :   bool LookupTransition(Handle<Map> map, Handle<Name> name,
     172             :                         MaybeHandle<JSObject> holder,
     173             :                         PropertyAccessInfo* access_info) const;
     174             :   bool ComputeDataFieldAccessInfo(Handle<Map> receiver_map, Handle<Map> map,
     175             :                                   MaybeHandle<JSObject> holder, int number,
     176             :                                   AccessMode access_mode,
     177             :                                   PropertyAccessInfo* access_info) const;
     178             :   bool ComputeAccessorDescriptorAccessInfo(
     179             :       Handle<Map> receiver_map, Handle<Name> name, Handle<Map> map,
     180             :       MaybeHandle<JSObject> holder, int number, AccessMode access_mode,
     181             :       PropertyAccessInfo* access_info) const;
     182             : 
     183             :   CompilationDependencies* dependencies() const { return dependencies_; }
     184             :   JSHeapBroker* broker() const { return broker_; }
     185             :   Factory* factory() const;
     186             :   Isolate* isolate() const { return isolate_; }
     187             :   Handle<Context> native_context() const { return native_context_; }
     188             :   Zone* zone() const { return zone_; }
     189             : 
     190             :   JSHeapBroker* const broker_;
     191             :   CompilationDependencies* const dependencies_;
     192             :   Handle<Context> const native_context_;
     193             :   Isolate* const isolate_;
     194             :   TypeCache const* const type_cache_;
     195             :   Zone* const zone_;
     196             : 
     197             :   DISALLOW_COPY_AND_ASSIGN(AccessInfoFactory);
     198             : };
     199             : 
     200             : }  // namespace compiler
     201             : }  // namespace internal
     202             : }  // namespace v8
     203             : 
     204             : #endif  // V8_COMPILER_ACCESS_INFO_H_

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