literal-objects.h 4.87 KB
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// Copyright 2017 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_LITERAL_OBJECTS_H_
#define V8_OBJECTS_LITERAL_OBJECTS_H_

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#include "src/base/bit-field.h"
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#include "src/objects/fixed-array.h"
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#include "src/objects/struct.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 ClassLiteral;

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// ObjectBoilerplateDescription is a list of properties consisting of name value
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// pairs. In addition to the properties, it provides the projected number
// of properties in the backing store. This number includes properties with
// computed names that are not
// in the list.
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// TODO(ishell): Don't derive from FixedArray as it already has its own map.
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class ObjectBoilerplateDescription : public FixedArray {
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 public:
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  inline Object name(int index) const;
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  inline Object name(const Isolate* isolate, int index) const;
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  inline Object value(int index) const;
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  inline Object value(const Isolate* isolate, int index) const;
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  inline void set_key_value(int index, Object key, Object value);
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  // The number of boilerplate properties.
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  inline int size() const;
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  // Number of boilerplate properties and properties with computed names.
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  inline int backing_store_size() const;
  inline void set_backing_store_size(int backing_store_size);
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  // Used to encode ObjectLiteral::Flags for nested object literals
  // Stored as the first element of the fixed array
  DECL_INT_ACCESSORS(flags)
  static const int kLiteralTypeOffset = 0;
  static const int kDescriptionStartIndex = 1;

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  DECL_CAST(ObjectBoilerplateDescription)
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  DECL_VERIFIER(ObjectBoilerplateDescription)
  DECL_PRINTER(ObjectBoilerplateDescription)
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 private:
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  inline bool has_number_of_properties() const;
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  OBJECT_CONSTRUCTORS(ObjectBoilerplateDescription, FixedArray);
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};

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class ArrayBoilerplateDescription
    : public TorqueGeneratedArrayBoilerplateDescription<
          ArrayBoilerplateDescription, Struct> {
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 public:
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  inline ElementsKind elements_kind() const;
  inline void set_elements_kind(ElementsKind kind);
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  inline bool is_empty() const;
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  // Dispatched behavior.
  DECL_PRINTER(ArrayBoilerplateDescription)
  void BriefPrintDetails(std::ostream& os);
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 private:
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  TQ_OBJECT_CONSTRUCTORS(ArrayBoilerplateDescription)
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};
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class ClassBoilerplate : public FixedArray {
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 public:
  enum ValueKind { kData, kGetter, kSetter };

  struct ComputedEntryFlags {
#define COMPUTED_ENTRY_BIT_FIELDS(V, _) \
  V(ValueKindBits, ValueKind, 2, _)     \
  V(KeyIndexBits, unsigned, 29, _)
    DEFINE_BIT_FIELDS(COMPUTED_ENTRY_BIT_FIELDS)
#undef COMPUTED_ENTRY_BIT_FIELDS
  };

  enum DefineClassArgumentsIndices {
    kConstructorArgumentIndex = 1,
    kPrototypeArgumentIndex = 2,
    // The index of a first dynamic argument passed to Runtime::kDefineClass
    // function. The dynamic arguments are consist of method closures and
    // computed property names.
    kFirstDynamicArgumentIndex = 3,
  };

  static const int kMinimumClassPropertiesCount = 6;
  static const int kMinimumPrototypePropertiesCount = 1;

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  DECL_CAST(ClassBoilerplate)
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  DECL_BOOLEAN_ACCESSORS(install_class_name_accessor)
  DECL_INT_ACCESSORS(arguments_count)
  DECL_ACCESSORS(static_properties_template, Object)
  DECL_ACCESSORS(static_elements_template, Object)
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  DECL_ACCESSORS(static_computed_properties, FixedArray)
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  DECL_ACCESSORS(instance_properties_template, Object)
  DECL_ACCESSORS(instance_elements_template, Object)
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  DECL_ACCESSORS(instance_computed_properties, FixedArray)
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  template <typename LocalIsolate>
  static void AddToPropertiesTemplate(LocalIsolate* isolate,
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                                      Handle<NameDictionary> dictionary,
                                      Handle<Name> name, int key_index,
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                                      ValueKind value_kind, Smi value);
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  template <typename LocalIsolate>
  static void AddToElementsTemplate(LocalIsolate* isolate,
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                                    Handle<NumberDictionary> dictionary,
                                    uint32_t key, int key_index,
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                                    ValueKind value_kind, Smi value);
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  template <typename LocalIsolate>
  static Handle<ClassBoilerplate> BuildClassBoilerplate(LocalIsolate* isolate,
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                                                        ClassLiteral* expr);

  enum {
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    kArgumentsCountIndex,
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    kClassPropertiesTemplateIndex,
    kClassElementsTemplateIndex,
    kClassComputedPropertiesIndex,
    kPrototypePropertiesTemplateIndex,
    kPrototypeElementsTemplateIndex,
    kPrototypeComputedPropertiesIndex,
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    kBoilerplateLength  // last element
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  };

 private:
  DECL_INT_ACCESSORS(flags)
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  OBJECT_CONSTRUCTORS(ClassBoilerplate, FixedArray);
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};

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}  // namespace internal
}  // namespace v8

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

#endif  // V8_OBJECTS_LITERAL_OBJECTS_H_