property-cell.h 2.89 KB
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// 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_PROPERTY_CELL_H_
#define V8_OBJECTS_PROPERTY_CELL_H_

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#include "src/objects/heap-object.h"
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#include "torque-generated/field-offsets-tq.h"
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// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"

namespace v8 {
namespace internal {

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class PropertyCell : public HeapObject {
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 public:
  // [name]: the name of the global property.
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  DECL_ACCESSORS(name, Name)
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  // [property_details]: details of the global property.
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  DECL_ACCESSORS(property_details_raw, Smi)
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  // [value]: value of the global property.
  DECL_ACCESSORS(value, Object)
  // [dependent_code]: dependent code that depends on the type of the global
  // property.
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  DECL_ACCESSORS(dependent_code, DependentCode)
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  inline PropertyDetails property_details() const;
  inline void set_property_details(PropertyDetails details);

  PropertyCellConstantType GetConstantType();

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  // Computes the new type of a previously uninitialized cell for the given
  // value.
  static PropertyCellType TypeForUninitializedCell(Isolate* isolate,
                                                   Handle<Object> value);
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  // Computes the new type of the cell's contents for the given value, but
  // without actually modifying the details.
  static PropertyCellType UpdatedType(Isolate* isolate,
                                      Handle<PropertyCell> cell,
                                      Handle<Object> value,
                                      PropertyDetails details);
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  // Prepares property cell at given entry for receiving given value.
  // As a result the old cell could be invalidated and/or dependent code could
  // be deoptimized. Returns the prepared property cell.
  static Handle<PropertyCell> PrepareForValue(
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      Isolate* isolate, Handle<GlobalDictionary> dictionary,
      InternalIndex entry, Handle<Object> value, PropertyDetails details);
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  void ClearAndInvalidate(ReadOnlyRoots roots);
  static Handle<PropertyCell> InvalidateAndReplaceEntry(
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      Isolate* isolate, Handle<GlobalDictionary> dictionary,
      InternalIndex entry);
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  static void SetValueWithInvalidation(Isolate* isolate, const char* cell_name,
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                                       Handle<PropertyCell> cell,
                                       Handle<Object> new_value);

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  DECL_CAST(PropertyCell)
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  // Dispatched behavior.
  DECL_PRINTER(PropertyCell)
  DECL_VERIFIER(PropertyCell)

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  DEFINE_FIELD_OFFSET_CONSTANTS(HeapObject::kHeaderSize,
                                TORQUE_GENERATED_PROPERTY_CELL_FIELDS)
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  using BodyDescriptor = FixedBodyDescriptor<kNameOffset, kSize, kSize>;
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  OBJECT_CONSTRUCTORS(PropertyCell, HeapObject);
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};

}  // namespace internal
}  // namespace v8

#include "src/objects/object-macros-undef.h"

#endif  // V8_OBJECTS_PROPERTY_CELL_H_