プリミティブ値

Primitiveクラス

プリミティブ値のスーパークラス。ECMA-262 4.3.2 参照。

Booleanクラス

プリミティブなブーリアン値（ECMA-262、4.3.14）。真か偽のどちらかの値。

名前	説明
Value()
Cast()	inline, static
New()	inline, static

PrimitiveArrayクラス

プリミティブ値を保持する配列。これは、エンベッダがコンパイル時にホスト定義のオプションを ScriptOptions に渡すために使用します。

これはモジュールのロード時に HostImportModuleDynamicallyCallback の一部としてエンベッダーに返されます。

名前	説明
New()	static
Length()
Set()
Get()
Cast()	inline, static

Nameクラス

シンボルと文字列のスーパークラス。

名前	説明
GetIdentityHash()	このオブジェクトの ID ハッシュを返します。現在の実装では、ID ハッシュを格納するためにオブジェクトのインラインプロパティを使用しています。また、一意であることは保証されない。
Cast()

NewStringTypeスコープ付き列挙型

文字列作成のさまざまなモードを表すフラグ。

パフォーマンスへの影響を除けば、2つの作成モードに違いはない。

名前	説明
kNormal	新しい文字列を作成し、常に新しいストレージ・メモリを確保する。
kInternalized	同一の文字列がすでに存在する場合、文字列は旧世代のヒープ空間に作成され、重複排除されるべきであることを示すヒントとして機能する。

Stringクラス

JavaScriptの文字列値 (ECMA-262, 4.3.17).

名前	説明
Length()	この文字列に含まれる文字数（UTF-16 コードユニット）を返します。
Utf8Length()	UTF-8でエンコードされた文字列のバイト数を返します。
IsOneByte()	この文字列が1バイトのデータ、すなわちISO-8859-1のコードポイントしか含まないことが分かっているかどうかを返します。文字列を読み取らない。偽陰性の可能性がある。
ContainsOnlyOneByte()	この文字列が1バイトのデータ、すなわちISO-8859-1のコードポイントのみを含むかどうかを返します。場合によっては文字列全体を読み込みます。
Write()	16ビット文字コード
WriteOneByte()	1バイト文字
WriteUtf8	UTF-8エンコード文字
Empty	(inline/static) 長さ0の文字列。
IsExternal()	文字列が外部であれば真を返す。
IsExternalTwoByte()	文字列が外部かつ2バイトの場合に真を返す。
IsExternalOneByte()	文字列が外部かつ半角の場合に真を返す。

class V8_EXPORT String : public Name {
 public:
  static constexpr int kMaxLength =
      internal::kApiSystemPointerSize == 4 ? (1 << 28) - 16 : (1 << 29) - 24;

  enum Encoding {
    UNKNOWN_ENCODING = 0x1,
    TWO_BYTE_ENCODING = 0x0,
    ONE_BYTE_ENCODING = 0x8
  };


  /**
   * Write the contents of the string to an external buffer.
   * If no arguments are given, expects the buffer to be large
   * enough to hold the entire string and NULL terminator. Copies
   * the contents of the string and the NULL terminator into the
   * buffer.
   *
   * WriteUtf8 will not write partial UTF-8 sequences, preferring to stop
   * before the end of the buffer.
   *
   * Copies up to length characters into the output buffer.
   * Only null-terminates if there is enough space in the buffer.
   *
   * \param buffer The buffer into which the string will be copied.
   * \param start The starting position within the string at which
   * copying begins.
   * \param length The number of characters to copy from the string.  For
   *    WriteUtf8 the number of bytes in the buffer.
   * \param nchars_ref The number of characters written, can be NULL.
   * \param options Various options that might affect performance of this or
   *    subsequent operations.
   * \return The number of characters copied to the buffer excluding the null
   *    terminator.  For WriteUtf8: The number of bytes copied to the buffer
   *    including the null terminator (if written).
   */
  enum WriteOptions {
    NO_OPTIONS = 0,
    HINT_MANY_WRITES_EXPECTED = 1,
    NO_NULL_TERMINATION = 2,
    PRESERVE_ONE_BYTE_NULL = 4,
    // Used by WriteUtf8 to replace orphan surrogate code units with the
    // unicode replacement character. Needs to be set to guarantee valid UTF-8
    // output.
    REPLACE_INVALID_UTF8 = 8
  };





  class V8_EXPORT ExternalStringResourceBase {
   public:
    virtual ~ExternalStringResourceBase() = default;

    /**
     * If a string is cacheable, the value returned by
     * ExternalStringResource::data() may be cached, otherwise it is not
     * expected to be stable beyond the current top-level task.
     */
    virtual bool IsCacheable() const { return true; }

    // Disallow copying and assigning.
    ExternalStringResourceBase(const ExternalStringResourceBase&) = delete;
    void operator=(const ExternalStringResourceBase&) = delete;

   protected:
    ExternalStringResourceBase() = default;

    /**
     * Internally V8 will call this Dispose method when the external string
     * resource is no longer needed. The default implementation will use the
     * delete operator. This method can be overridden in subclasses to
     * control how allocated external string resources are disposed.
     */
    virtual void Dispose() { delete this; }

    /**
     * For a non-cacheable string, the value returned by
     * |ExternalStringResource::data()| has to be stable between |Lock()| and
     * |Unlock()|, that is the string must behave as is |IsCacheable()| returned
     * true.
     *
     * These two functions must be thread-safe, and can be called from anywhere.
     * They also must handle lock depth, in the sense that each can be called
     * several times, from different threads, and unlocking should only happen
     * when the balance of Lock() and Unlock() calls is 0.
     */
    virtual void Lock() const {}

    /**
     * Unlocks the string.
     */
    virtual void Unlock() const {}

   private:
    friend class internal::ExternalString;
    friend class v8::String;
    friend class internal::StringForwardingTable;
    friend class internal::ScopedExternalStringLock;
  };

  /**
   * An ExternalStringResource is a wrapper around a two-byte string
   * buffer that resides outside V8's heap. Implement an
   * ExternalStringResource to manage the life cycle of the underlying
   * buffer.  Note that the string data must be immutable.
   */
  class V8_EXPORT ExternalStringResource : public ExternalStringResourceBase {
   public:
    /**
     * Override the destructor to manage the life cycle of the underlying
     * buffer.
     */
    ~ExternalStringResource() override = default;

    /**
     * The string data from the underlying buffer. If the resource is cacheable
     * then data() must return the same value for all invocations.
     */
    virtual const uint16_t* data() const = 0;

    /**
     * The length of the string. That is, the number of two-byte characters.
     */
    virtual size_t length() const = 0;

    /**
     * Returns the cached data from the underlying buffer. This method can be
     * called only for cacheable resources (i.e. IsCacheable() == true) and only
     * after UpdateDataCache() was called.
     */
    const uint16_t* cached_data() const {
      CheckCachedDataInvariants();
      return cached_data_;
    }

    /**
     * Update {cached_data_} with the data from the underlying buffer. This can
     * be called only for cacheable resources.
     */
    void UpdateDataCache();

   protected:
    ExternalStringResource() = default;

   private:
    void CheckCachedDataInvariants() const;

    const uint16_t* cached_data_ = nullptr;
  };

  /**
   * An ExternalOneByteStringResource is a wrapper around an one-byte
   * string buffer that resides outside V8's heap. Implement an
   * ExternalOneByteStringResource to manage the life cycle of the
   * underlying buffer.  Note that the string data must be immutable
   * and that the data must be Latin-1 and not UTF-8, which would require
   * special treatment internally in the engine and do not allow efficient
   * indexing.  Use String::New or convert to 16 bit data for non-Latin1.
   */

  class V8_EXPORT ExternalOneByteStringResource
      : public ExternalStringResourceBase {
   public:
    /**
     * Override the destructor to manage the life cycle of the underlying
     * buffer.
     */
    ~ExternalOneByteStringResource() override = default;

    /**
     * The string data from the underlying buffer. If the resource is cacheable
     * then data() must return the same value for all invocations.
     */
    virtual const char* data() const = 0;

    /** The number of Latin-1 characters in the string.*/
    virtual size_t length() const = 0;

    /**
     * Returns the cached data from the underlying buffer. If the resource is
     * uncacheable or if UpdateDataCache() was not called before, it has
     * undefined behaviour.
     */
    const char* cached_data() const {
      CheckCachedDataInvariants();
      return cached_data_;
    }

    /**
     * Update {cached_data_} with the data from the underlying buffer. This can
     * be called only for cacheable resources.
     */
    void UpdateDataCache();

   protected:
    ExternalOneByteStringResource() = default;

   private:
    void CheckCachedDataInvariants() const;

    const char* cached_data_ = nullptr;
  };

  /**
   * If the string is an external string, return the ExternalStringResourceBase
   * regardless of the encoding, otherwise return NULL.  The encoding of the
   * string is returned in encoding_out.
   */
  V8_INLINE ExternalStringResourceBase* GetExternalStringResourceBase(
      Encoding* encoding_out) const;

  /**
   * Get the ExternalStringResource for an external string.  Returns
   * NULL if IsExternal() doesn't return true.
   */
  V8_INLINE ExternalStringResource* GetExternalStringResource() const;

  /**
   * Get the ExternalOneByteStringResource for an external one-byte string.
   * Returns NULL if IsExternalOneByte() doesn't return true.
   */
  const ExternalOneByteStringResource* GetExternalOneByteStringResource() const;

  V8_INLINE static String* Cast(v8::Data* data) {
#ifdef V8_ENABLE_CHECKS
    CheckCast(data);
#endif
    return static_cast<String*>(data);
  }

  /**
   * Allocates a new string from a UTF-8 literal. This is equivalent to calling
   * String::NewFromUtf(isolate, "...").ToLocalChecked(), but without the check
   * overhead.
   *
   * When called on a string literal containing '\0', the inferred length is the
   * length of the input array minus 1 (for the final '\0') and not the value
   * returned by strlen.
   **/
  template <int N>
  static V8_WARN_UNUSED_RESULT Local<String> NewFromUtf8Literal(
      Isolate* isolate, const char (&literal)[N],
      NewStringType type = NewStringType::kNormal) {
    static_assert(N <= kMaxLength, "String is too long");
    return NewFromUtf8Literal(isolate, literal, type, N - 1);
  }

  /** Allocates a new string from UTF-8 data. Only returns an empty value when
   * length > kMaxLength. **/
  static V8_WARN_UNUSED_RESULT MaybeLocal<String> NewFromUtf8(
      Isolate* isolate, const char* data,
      NewStringType type = NewStringType::kNormal, int length = -1);

  /** Allocates a new string from Latin-1 data.  Only returns an empty value
   * when length > kMaxLength. **/
  static V8_WARN_UNUSED_RESULT MaybeLocal<String> NewFromOneByte(
      Isolate* isolate, const uint8_t* data,
      NewStringType type = NewStringType::kNormal, int length = -1);

  /** Allocates a new string from UTF-16 data. Only returns an empty value when
   * length > kMaxLength. **/
  static V8_WARN_UNUSED_RESULT MaybeLocal<String> NewFromTwoByte(
      Isolate* isolate, const uint16_t* data,
      NewStringType type = NewStringType::kNormal, int length = -1);

  /**
   * Creates a new string by concatenating the left and the right strings
   * passed in as parameters.
   */
  static Local<String> Concat(Isolate* isolate, Local<String> left,
                              Local<String> right);

  /**
   * Creates a new external string using the data defined in the given
   * resource. When the external string is no longer live on V8's heap the
   * resource will be disposed by calling its Dispose method. The caller of
   * this function should not otherwise delete or modify the resource. Neither
   * should the underlying buffer be deallocated or modified except through the
   * destructor of the external string resource.
   */
  static V8_WARN_UNUSED_RESULT MaybeLocal<String> NewExternalTwoByte(
      Isolate* isolate, ExternalStringResource* resource);

  /**
   * Associate an external string resource with this string by transforming it
   * in place so that existing references to this string in the JavaScript heap
   * will use the external string resource. The external string resource's
   * character contents need to be equivalent to this string.
   * Returns true if the string has been changed to be an external string.
   * The string is not modified if the operation fails. See NewExternal for
   * information on the lifetime of the resource.
   */
  bool MakeExternal(ExternalStringResource* resource);

  /**
   * Creates a new external string using the one-byte data defined in the given
   * resource. When the external string is no longer live on V8's heap the
   * resource will be disposed by calling its Dispose method. The caller of
   * this function should not otherwise delete or modify the resource. Neither
   * should the underlying buffer be deallocated or modified except through the
   * destructor of the external string resource.
   */
  static V8_WARN_UNUSED_RESULT MaybeLocal<String> NewExternalOneByte(
      Isolate* isolate, ExternalOneByteStringResource* resource);

  /**
   * Associate an external string resource with this string by transforming it
   * in place so that existing references to this string in the JavaScript heap
   * will use the external string resource. The external string resource's
   * character contents need to be equivalent to this string.
   * Returns true if the string has been changed to be an external string.
   * The string is not modified if the operation fails. See NewExternal for
   * information on the lifetime of the resource.
   */
  bool MakeExternal(ExternalOneByteStringResource* resource);

  /**
   * Returns true if this string can be made external, given the encoding for
   * the external string resource.
   */
  bool CanMakeExternal(Encoding encoding) const;

  /**
   * Returns true if the strings values are equal. Same as JS ==/===.
   */
  bool StringEquals(Local<String> str) const;

  /**
   * Converts an object to a UTF-8-encoded character array.  Useful if
   * you want to print the object.  If conversion to a string fails
   * (e.g. due to an exception in the toString() method of the object)
   * then the length() method returns 0 and the * operator returns
   * NULL.
   */
  class V8_EXPORT Utf8Value {
   public:
    Utf8Value(Isolate* isolate, Local<v8::Value> obj);
    ~Utf8Value();
    char* operator*() { return str_; }
    const char* operator*() const { return str_; }
    int length() const { return length_; }

    // Disallow copying and assigning.
    Utf8Value(const Utf8Value&) = delete;
    void operator=(const Utf8Value&) = delete;

   private:
    char* str_;
    int length_;
  };

  /**
   * Converts an object to a two-byte (UTF-16-encoded) string.
   * If conversion to a string fails (eg. due to an exception in the toString()
   * method of the object) then the length() method returns 0 and the * operator
   * returns NULL.
   */
  class V8_EXPORT Value {
   public:
    Value(Isolate* isolate, Local<v8::Value> obj);
    ~Value();
    uint16_t* operator*() { return str_; }
    const uint16_t* operator*() const { return str_; }
    int length() const { return length_; }

    // Disallow copying and assigning.
    Value(const Value&) = delete;
    void operator=(const Value&) = delete;

   private:
    uint16_t* str_;
    int length_;
  };

 private:
  void VerifyExternalStringResourceBase(ExternalStringResourceBase* v,
                                        Encoding encoding) const;
  void VerifyExternalStringResource(ExternalStringResource* val) const;
  ExternalStringResource* GetExternalStringResourceSlow() const;
  ExternalStringResourceBase* GetExternalStringResourceBaseSlow(
      String::Encoding* encoding_out) const;

  static Local<v8::String> NewFromUtf8Literal(Isolate* isolate,
                                              const char* literal,
                                              NewStringType type, int length);

  static void CheckCast(v8::Data* that);
};

// Zero-length string specialization (templated string size includes
// terminator).
template <>
inline V8_WARN_UNUSED_RESULT Local<String> String::NewFromUtf8Literal(
    Isolate* isolate, const char (&literal)[1], NewStringType type) {
  return String::Empty(isolate);
}

/**
 * Interface for iterating through all external resources in the heap.
 */
class V8_EXPORT ExternalResourceVisitor {
 public:
  virtual ~ExternalResourceVisitor() = default;
  virtual void VisitExternalString(Local<String> string) {}
};

/**
 * A JavaScript symbol (ECMA-262 edition 6)
 */
class V8_EXPORT Symbol : public Name {
 public:
  /**
   * Returns the description string of the symbol, or undefined if none.
   */
  Local<Value> Description(Isolate* isolate) const;

  /**
   * Create a symbol. If description is not empty, it will be used as the
   * description.
   */
  static Local<Symbol> New(Isolate* isolate,
                           Local<String> description = Local<String>());

  /**
   * Access global symbol registry.
   * Note that symbols created this way are never collected, so
   * they should only be used for statically fixed properties.
   * Also, there is only one global name space for the descriptions used as
   * keys.
   * To minimize the potential for clashes, use qualified names as keys.
   */
  static Local<Symbol> For(Isolate* isolate, Local<String> description);

  /**
   * Retrieve a global symbol. Similar to |For|, but using a separate
   * registry that is not accessible by (and cannot clash with) JavaScript code.
   */
  static Local<Symbol> ForApi(Isolate* isolate, Local<String> description);

  // Well-known symbols
  static Local<Symbol> GetAsyncIterator(Isolate* isolate);
  static Local<Symbol> GetHasInstance(Isolate* isolate);
  static Local<Symbol> GetIsConcatSpreadable(Isolate* isolate);
  static Local<Symbol> GetIterator(Isolate* isolate);
  static Local<Symbol> GetMatch(Isolate* isolate);
  static Local<Symbol> GetReplace(Isolate* isolate);
  static Local<Symbol> GetSearch(Isolate* isolate);
  static Local<Symbol> GetSplit(Isolate* isolate);
  static Local<Symbol> GetToPrimitive(Isolate* isolate);
  static Local<Symbol> GetToStringTag(Isolate* isolate);
  static Local<Symbol> GetUnscopables(Isolate* isolate);

  V8_INLINE static Symbol* Cast(Data* data) {
#ifdef V8_ENABLE_CHECKS
    CheckCast(data);
#endif
    return static_cast<Symbol*>(data);
  }

 private:
  Symbol();
  static void CheckCast(Data* that);
};

/**
 * A JavaScript number value (ECMA-262, 4.3.20)
 */
class V8_EXPORT Number : public Primitive {
 public:
  double Value() const;
  static Local<Number> New(Isolate* isolate, double value);
  V8_INLINE static Number* Cast(v8::Data* data) {
#ifdef V8_ENABLE_CHECKS
    CheckCast(data);
#endif
    return static_cast<Number*>(data);
  }

 private:
  Number();
  static void CheckCast(v8::Data* that);
};

/**
 * A JavaScript value representing a signed integer.
 */
class V8_EXPORT Integer : public Number {
 public:
  static Local<Integer> New(Isolate* isolate, int32_t value);
  static Local<Integer> NewFromUnsigned(Isolate* isolate, uint32_t value);
  int64_t Value() const;
  V8_INLINE static Integer* Cast(v8::Data* data) {
#ifdef V8_ENABLE_CHECKS
    CheckCast(data);
#endif
    return static_cast<Integer*>(data);
  }

 private:
  Integer();
  static void CheckCast(v8::Data* that);
};

/**
 * A JavaScript value representing a 32-bit signed integer.
 */
class V8_EXPORT Int32 : public Integer {
 public:
  int32_t Value() const;
  V8_INLINE static Int32* Cast(v8::Data* data) {
#ifdef V8_ENABLE_CHECKS
    CheckCast(data);
#endif
    return static_cast<Int32*>(data);
  }

 private:
  Int32();
  static void CheckCast(v8::Data* that);
};

/**
 * A JavaScript value representing a 32-bit unsigned integer.
 */
class V8_EXPORT Uint32 : public Integer {
 public:
  uint32_t Value() const;
  V8_INLINE static Uint32* Cast(v8::Data* data) {
#ifdef V8_ENABLE_CHECKS
    CheckCast(data);
#endif
    return static_cast<Uint32*>(data);
  }

 private:
  Uint32();
  static void CheckCast(v8::Data* that);
};

/**
 * A JavaScript BigInt value (https://tc39.github.io/proposal-bigint)
 */
class V8_EXPORT BigInt : public Primitive {
 public:
  static Local<BigInt> New(Isolate* isolate, int64_t value);
  static Local<BigInt> NewFromUnsigned(Isolate* isolate, uint64_t value);
  /**
   * Creates a new BigInt object using a specified sign bit and a
   * specified list of digits/words.
   * The resulting number is calculated as:
   *
   * (-1)^sign_bit * (words[0] * (2^64)^0 + words[1] * (2^64)^1 + ...)
   */
  static MaybeLocal<BigInt> NewFromWords(Local<Context> context, int sign_bit,
                                         int word_count, const uint64_t* words);

  /**
   * Returns the value of this BigInt as an unsigned 64-bit integer.
   * If `lossless` is provided, it will reflect whether the return value was
   * truncated or wrapped around. In particular, it is set to `false` if this
   * BigInt is negative.
   */
  uint64_t Uint64Value(bool* lossless = nullptr) const;

  /**
   * Returns the value of this BigInt as a signed 64-bit integer.
   * If `lossless` is provided, it will reflect whether this BigInt was
   * truncated or not.
   */
  int64_t Int64Value(bool* lossless = nullptr) const;

  /**
   * Returns the number of 64-bit words needed to store the result of
   * ToWordsArray().
   */
  int WordCount() const;

  /**
   * Writes the contents of this BigInt to a specified memory location.
   * `sign_bit` must be provided and will be set to 1 if this BigInt is
   * negative.
   * `*word_count` has to be initialized to the length of the `words` array.
   * Upon return, it will be set to the actual number of words that would
   * be needed to store this BigInt (i.e. the return value of `WordCount()`).
   */
  void ToWordsArray(int* sign_bit, int* word_count, uint64_t* words) const;

  V8_INLINE static BigInt* Cast(v8::Data* data) {
#ifdef V8_ENABLE_CHECKS
    CheckCast(data);
#endif
    return static_cast<BigInt*>(data);
  }

 private:
  BigInt();
  static void CheckCast(v8::Data* that);
};

Local<String> String::Empty(Isolate* isolate) {
  using S = internal::Address;
  using I = internal::Internals;
  I::CheckInitialized(isolate);
  S* slot = I::GetRootSlot(isolate, I::kEmptyStringRootIndex);
  return Local<String>::FromSlot(slot);
}

String::ExternalStringResource* String::GetExternalStringResource() const {
  using A = internal::Address;
  using I = internal::Internals;
  A obj = internal::ValueHelper::ValueAsAddress(this);

  ExternalStringResource* result;
  if (I::IsExternalTwoByteString(I::GetInstanceType(obj))) {
    Isolate* isolate = I::GetIsolateForSandbox(obj);
    A value = I::ReadExternalPointerField<internal::kExternalStringResourceTag>(
        isolate, obj, I::kStringResourceOffset);
    result = reinterpret_cast<String::ExternalStringResource*>(value);
  } else {
    result = GetExternalStringResourceSlow();
  }
#ifdef V8_ENABLE_CHECKS
  VerifyExternalStringResource(result);
#endif
  return result;
}

String::ExternalStringResourceBase* String::GetExternalStringResourceBase(
    String::Encoding* encoding_out) const {
  using A = internal::Address;
  using I = internal::Internals;
  A obj = internal::ValueHelper::ValueAsAddress(this);
  int type = I::GetInstanceType(obj) & I::kStringRepresentationAndEncodingMask;
  *encoding_out = static_cast<Encoding>(type & I::kStringEncodingMask);
  ExternalStringResourceBase* resource;
  if (type == I::kExternalOneByteRepresentationTag ||
      type == I::kExternalTwoByteRepresentationTag) {
    Isolate* isolate = I::GetIsolateForSandbox(obj);
    A value = I::ReadExternalPointerField<internal::kExternalStringResourceTag>(
        isolate, obj, I::kStringResourceOffset);
    resource = reinterpret_cast<ExternalStringResourceBase*>(value);
  } else {
    resource = GetExternalStringResourceBaseSlow(encoding_out);
  }
#ifdef V8_ENABLE_CHECKS
  VerifyExternalStringResourceBase(resource, *encoding_out);
#endif
  return resource;
}

// --- Statics ---

V8_INLINE Local<Primitive> Undefined(Isolate* isolate) {
  using S = internal::Address;
  using I = internal::Internals;
  I::CheckInitialized(isolate);
  S* slot = I::GetRootSlot(isolate, I::kUndefinedValueRootIndex);
  return Local<Primitive>::FromSlot(slot);
}

V8_INLINE Local<Primitive> Null(Isolate* isolate) {
  using S = internal::Address;
  using I = internal::Internals;
  I::CheckInitialized(isolate);
  S* slot = I::GetRootSlot(isolate, I::kNullValueRootIndex);
  return Local<Primitive>::FromSlot(slot);
}

V8_INLINE Local<Boolean> True(Isolate* isolate) {
  using S = internal::Address;
  using I = internal::Internals;
  I::CheckInitialized(isolate);
  S* slot = I::GetRootSlot(isolate, I::kTrueValueRootIndex);
  return Local<Boolean>::FromSlot(slot);
}

V8_INLINE Local<Boolean> False(Isolate* isolate) {
  using S = internal::Address;
  using I = internal::Internals;
  I::CheckInitialized(isolate);
  S* slot = I::GetRootSlot(isolate, I::kFalseValueRootIndex);
  return Local<Boolean>::FromSlot(slot);
}

Local<Boolean> Boolean::New(Isolate* isolate, bool value) {
  return value ? True(isolate) : False(isolate);
}

}  // namespace v8

#endif  // INCLUDE_V8_PRIMITIVE_H_