Line data    Source code

       1             : // Copyright 2018 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_OBJECTS_PROPERTY_CELL_H_
       6             : #define V8_OBJECTS_PROPERTY_CELL_H_
       7             : 
       8             : #include "src/objects/heap-object.h"
       9             : 
      10             : // Has to be the last include (doesn't have include guards):
      11             : #include "src/objects/object-macros.h"
      12             : 
      13             : namespace v8 {
      14             : namespace internal {
      15             : 
      16             : class PropertyCell : public HeapObject {
      17             :  public:
      18             :   // [name]: the name of the global property.
      19             :   DECL_ACCESSORS(name, Name)
      20             :   // [property_details]: details of the global property.
      21             :   DECL_ACCESSORS(property_details_raw, Object)
      22             :   // [value]: value of the global property.
      23             :   DECL_ACCESSORS(value, Object)
      24             :   // [dependent_code]: dependent code that depends on the type of the global
      25             :   // property.
      26             :   DECL_ACCESSORS(dependent_code, DependentCode)
      27             : 
      28             :   inline PropertyDetails property_details() const;
      29             :   inline void set_property_details(PropertyDetails details);
      30             : 
      31             :   PropertyCellConstantType GetConstantType();
      32             : 
      33             :   // Computes the new type of the cell's contents for the given value, but
      34             :   // without actually modifying the details.
      35             :   static PropertyCellType UpdatedType(Isolate* isolate,
      36             :                                       Handle<PropertyCell> cell,
      37             :                                       Handle<Object> value,
      38             :                                       PropertyDetails details);
      39             :   // Prepares property cell at given entry for receiving given value.
      40             :   // As a result the old cell could be invalidated and/or dependent code could
      41             :   // be deoptimized. Returns the prepared property cell.
      42             :   static Handle<PropertyCell> PrepareForValue(
      43             :       Isolate* isolate, Handle<GlobalDictionary> dictionary, int entry,
      44             :       Handle<Object> value, PropertyDetails details);
      45             : 
      46             :   static Handle<PropertyCell> InvalidateEntry(
      47             :       Isolate* isolate, Handle<GlobalDictionary> dictionary, int entry);
      48             : 
      49             :   static void SetValueWithInvalidation(Isolate* isolate,
      50             :                                        Handle<PropertyCell> cell,
      51             :                                        Handle<Object> new_value);
      52             : 
      53             :   DECL_CAST(PropertyCell)
      54             : 
      55             :   // Dispatched behavior.
      56             :   DECL_PRINTER(PropertyCell)
      57             :   DECL_VERIFIER(PropertyCell)
      58             : 
      59             : // Layout description.
      60             : #define PROPERTY_CELL_FIELDS(V)        \
      61             :   V(kDetailsOffset, kTaggedSize)       \
      62             :   V(kNameOffset, kTaggedSize)          \
      63             :   V(kValueOffset, kTaggedSize)         \
      64             :   V(kDependentCodeOffset, kTaggedSize) \
      65             :   /* Total size. */                    \
      66             :   V(kSize, 0)
      67             : 
      68             :   DEFINE_FIELD_OFFSET_CONSTANTS(HeapObject::kHeaderSize, PROPERTY_CELL_FIELDS)
      69             : #undef PROPERTY_CELL_FIELDS
      70             : 
      71             :   typedef FixedBodyDescriptor<kNameOffset, kSize, kSize> BodyDescriptor;
      72             : 
      73      121990 :   OBJECT_CONSTRUCTORS(PropertyCell, HeapObject);
      74             : };
      75             : 
      76             : }  // namespace internal
      77             : }  // namespace v8
      78             : 
      79             : #include "src/objects/object-macros-undef.h"
      80             : 
      81             : #endif  // V8_OBJECTS_PROPERTY_CELL_H_