src/builtins/builtins-intl.cc

// 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_INTL_SUPPORT
#error Internationalization is expected to be enabled.
#endif  // V8_INTL_SUPPORT

#include <cmath>
#include <list>
#include <memory>

#include "src/builtins/builtins-utils-inl.h"
#include "src/builtins/builtins.h"
#include "src/date/date.h"
#include "src/logging/counters.h"
#include "src/objects/elements.h"
#include "src/objects/intl-objects.h"
#include "src/objects/js-array-inl.h"
#include "src/objects/js-break-iterator-inl.h"
#include "src/objects/js-collator-inl.h"
#include "src/objects/js-date-time-format-inl.h"
#include "src/objects/js-display-names-inl.h"
#include "src/objects/js-list-format-inl.h"
#include "src/objects/js-locale-inl.h"
#include "src/objects/js-number-format-inl.h"
#include "src/objects/js-plural-rules-inl.h"
#include "src/objects/js-relative-time-format-inl.h"
#include "src/objects/js-segment-iterator-inl.h"
#include "src/objects/js-segmenter-inl.h"
#include "src/objects/js-segments-inl.h"
#include "src/objects/objects-inl.h"
#include "src/objects/property-descriptor.h"
#include "src/objects/smi.h"
#include "unicode/brkiter.h"

namespace v8 {
namespace internal {

BUILTIN(StringPrototypeToUpperCaseIntl) {
  HandleScope scope(isolate);
  TO_THIS_STRING(string, "String.prototype.toUpperCase");
  string = String::Flatten(isolate, string);
  RETURN_RESULT_OR_FAILURE(isolate, Intl::ConvertToUpper(isolate, string));
}

BUILTIN(StringPrototypeNormalizeIntl) {
  HandleScope handle_scope(isolate);
  isolate->CountUsage(v8::Isolate::UseCounterFeature::kStringNormalize);
  TO_THIS_STRING(string, "String.prototype.normalize");

  Handle<Object> form_input = args.atOrUndefined(isolate, 1);

  RETURN_RESULT_OR_FAILURE(isolate,
                           Intl::Normalize(isolate, string, form_input));
}

BUILTIN(V8BreakIteratorSupportedLocalesOf) {
  HandleScope scope(isolate);
  Handle<Object> locales = args.atOrUndefined(isolate, 1);
  Handle<Object> options = args.atOrUndefined(isolate, 2);

  RETURN_RESULT_OR_FAILURE(
      isolate, Intl::SupportedLocalesOf(
                   isolate, "Intl.v8BreakIterator.supportedLocalesOf",
                   JSV8BreakIterator::GetAvailableLocales(), locales, options));
}

BUILTIN(NumberFormatSupportedLocalesOf) {
  HandleScope scope(isolate);
  Handle<Object> locales = args.atOrUndefined(isolate, 1);
  Handle<Object> options = args.atOrUndefined(isolate, 2);

  RETURN_RESULT_OR_FAILURE(
      isolate, Intl::SupportedLocalesOf(
                   isolate, "Intl.NumberFormat.supportedLocalesOf",
                   JSNumberFormat::GetAvailableLocales(), locales, options));
}

BUILTIN(NumberFormatPrototypeFormatToParts) {
  const char* const method = "Intl.NumberFormat.prototype.formatToParts";
  HandleScope handle_scope(isolate);
  CHECK_RECEIVER(JSNumberFormat, number_format, method);

  Handle<Object> x;
  if (args.length() >= 2) {
    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, x,
                                       Object::ToNumeric(isolate, args.at(1)));
  } else {
    x = isolate->factory()->nan_value();
  }

  RETURN_RESULT_OR_FAILURE(
      isolate, JSNumberFormat::FormatToParts(isolate, number_format, x));
}

BUILTIN(DateTimeFormatPrototypeResolvedOptions) {
  const char* const method = "Intl.DateTimeFormat.prototype.resolvedOptions";
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSReceiver, format_holder, method);

  // 3. Let dtf be ? UnwrapDateTimeFormat(dtf).
  Handle<JSDateTimeFormat> date_time_format;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
      isolate, date_time_format,
      JSDateTimeFormat::UnwrapDateTimeFormat(isolate, format_holder));

  RETURN_RESULT_OR_FAILURE(
      isolate, JSDateTimeFormat::ResolvedOptions(isolate, date_time_format));
}

BUILTIN(DateTimeFormatSupportedLocalesOf) {
  HandleScope scope(isolate);
  Handle<Object> locales = args.atOrUndefined(isolate, 1);
  Handle<Object> options = args.atOrUndefined(isolate, 2);

  RETURN_RESULT_OR_FAILURE(
      isolate, Intl::SupportedLocalesOf(
                   isolate, "Intl.DateTimeFormat.supportedLocalesOf",
                   JSDateTimeFormat::GetAvailableLocales(), locales, options));
}

BUILTIN(DateTimeFormatPrototypeFormatToParts) {
  const char* const method = "Intl.DateTimeFormat.prototype.formatToParts";
  HandleScope handle_scope(isolate);
  CHECK_RECEIVER(JSObject, date_format_holder, method);
  Factory* factory = isolate->factory();

  if (!date_format_holder->IsJSDateTimeFormat()) {
    THROW_NEW_ERROR_RETURN_FAILURE(
        isolate, NewTypeError(MessageTemplate::kIncompatibleMethodReceiver,
                              factory->NewStringFromAsciiChecked(method),
                              date_format_holder));
  }
  Handle<JSDateTimeFormat> dtf =
      Handle<JSDateTimeFormat>::cast(date_format_holder);

  Handle<Object> x = args.atOrUndefined(isolate, 1);
  if (x->IsUndefined(isolate)) {
    x = factory->NewNumber(JSDate::CurrentTimeValue(isolate));
  } else {
    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, x,
                                       Object::ToNumber(isolate, args.at(1)));
  }

  double date_value = DateCache::TimeClip(x->Number());
  if (std::isnan(date_value)) {
    THROW_NEW_ERROR_RETURN_FAILURE(
        isolate, NewRangeError(MessageTemplate::kInvalidTimeValue));
  }

  RETURN_RESULT_OR_FAILURE(
      isolate, JSDateTimeFormat::FormatToParts(isolate, dtf, date_value));
}

// Common code for DateTimeFormatPrototypeFormtRange(|ToParts)
template <class T>
V8_WARN_UNUSED_RESULT Object DateTimeFormatRange(
    BuiltinArguments args, Isolate* isolate, const char* const method,
    MaybeHandle<T> (*format)(Isolate*, Handle<JSDateTimeFormat>, double,
                             double)) {
  // 1. Let dtf be this value.
  // 2. If Type(dtf) is not Object, throw a TypeError exception.
  CHECK_RECEIVER(JSObject, date_format_holder, method);

  Factory* factory = isolate->factory();

  // 3. If dtf does not have an [[InitializedDateTimeFormat]] internal slot,
  //    throw a TypeError exception.
  if (!date_format_holder->IsJSDateTimeFormat()) {
    THROW_NEW_ERROR_RETURN_FAILURE(
        isolate, NewTypeError(MessageTemplate::kIncompatibleMethodReceiver,
                              factory->NewStringFromAsciiChecked(method),
                              date_format_holder));
  }
  Handle<JSDateTimeFormat> dtf =
      Handle<JSDateTimeFormat>::cast(date_format_holder);

  // 4. If startDate is undefined or endDate is undefined, throw a TypeError
  // exception.
  Handle<Object> start_date = args.atOrUndefined(isolate, 1);
  Handle<Object> end_date = args.atOrUndefined(isolate, 2);
  if (start_date->IsUndefined(isolate) || end_date->IsUndefined(isolate)) {
    THROW_NEW_ERROR_RETURN_FAILURE(
        isolate, NewTypeError(MessageTemplate::kInvalidTimeValue));
  }
  // 5. Let x be ? ToNumber(startDate).
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, start_date,
                                     Object::ToNumber(isolate, start_date));
  double x = start_date->Number();

  // 6. Let y be ? ToNumber(endDate).
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, end_date,
                                     Object::ToNumber(isolate, end_date));
  double y = end_date->Number();
  // 7. If x is greater than y, throw a RangeError exception.
  if (x > y) {
    THROW_NEW_ERROR_RETURN_FAILURE(
        isolate, NewRangeError(MessageTemplate::kInvalidTimeValue));
  }

  // 8. Return ? FormatDateTimeRange(dtf, x, y)
  // OR
  // 8. Return ? FormatDateTimeRangeToParts(dtf, x, y).
  RETURN_RESULT_OR_FAILURE(isolate, format(isolate, dtf, x, y));
}

BUILTIN(DateTimeFormatPrototypeFormatRange) {
  const char* const method = "Intl.DateTimeFormat.prototype.formatRange";
  HandleScope handle_scope(isolate);
  return DateTimeFormatRange<String>(args, isolate, method,
                                     JSDateTimeFormat::FormatRange);
}

BUILTIN(DateTimeFormatPrototypeFormatRangeToParts) {
  const char* const method = "Intl.DateTimeFormat.prototype.formatRangeToParts";
  HandleScope handle_scope(isolate);
  return DateTimeFormatRange<JSArray>(args, isolate, method,
                                      JSDateTimeFormat::FormatRangeToParts);
}

namespace {
Handle<JSFunction> CreateBoundFunction(Isolate* isolate,
                                       Handle<JSObject> object,
                                       Builtins::Name builtin_id, int len) {
  Handle<NativeContext> native_context(isolate->context().native_context(),
                                       isolate);
  Handle<Context> context = isolate->factory()->NewBuiltinContext(
      native_context,
      static_cast<int>(Intl::BoundFunctionContextSlot::kLength));

  context->set(static_cast<int>(Intl::BoundFunctionContextSlot::kBoundFunction),
               *object);

  Handle<SharedFunctionInfo> info =
      isolate->factory()->NewSharedFunctionInfoForBuiltin(
          isolate->factory()->empty_string(), builtin_id, kNormalFunction);
  info->set_internal_formal_parameter_count(len);
  info->set_length(len);

  Handle<Map> map = isolate->strict_function_without_prototype_map();

  Handle<JSFunction> new_bound_function =
      isolate->factory()->NewFunctionFromSharedFunctionInfo(map, info, context);
  return new_bound_function;
}

/**
 * Common code shared between DateTimeFormatConstructor and
 * NumberFormatConstrutor
 */
template <class T>
Object LegacyFormatConstructor(BuiltinArguments args, Isolate* isolate,
                               v8::Isolate::UseCounterFeature feature,
                               Handle<Object> constructor, const char* method) {
  isolate->CountUsage(feature);
  Handle<JSReceiver> new_target;
  // 1. If NewTarget is undefined, let newTarget be the active
  // function object, else let newTarget be NewTarget.
  if (args.new_target()->IsUndefined(isolate)) {
    new_target = args.target();
  } else {
    new_target = Handle<JSReceiver>::cast(args.new_target());
  }

  // [[Construct]]
  Handle<JSFunction> target = args.target();
  Handle<Object> locales = args.atOrUndefined(isolate, 1);
  Handle<Object> options = args.atOrUndefined(isolate, 2);

  // 2. Let format be ? OrdinaryCreateFromConstructor(newTarget,
  // "%<T>Prototype%", ...).
  Handle<Map> map;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
      isolate, map, JSFunction::GetDerivedMap(isolate, target, new_target));

  // 3. Perform ? Initialize<T>(Format, locales, options).
  Handle<T> format;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
      isolate, format, T::New(isolate, map, locales, options, method));
  // 4. Let this be the this value.
  if (args.new_target()->IsUndefined(isolate)) {
    Handle<Object> receiver = args.receiver();

    // 5. If NewTarget is undefined and ? InstanceofOperator(this, %<T>%)
    // is true, then Look up the intrinsic value that has been stored on
    // the context.
    Handle<Object> is_instance_of_obj;
    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
        isolate, is_instance_of_obj,
        Object::InstanceOf(isolate, receiver, constructor));

    if (is_instance_of_obj->BooleanValue(isolate)) {
      if (!receiver->IsJSReceiver()) {
        THROW_NEW_ERROR_RETURN_FAILURE(
            isolate,
            NewTypeError(MessageTemplate::kIncompatibleMethodReceiver,
                         isolate->factory()->NewStringFromAsciiChecked(method),
                         receiver));
      }
      Handle<JSReceiver> rec = Handle<JSReceiver>::cast(receiver);
      // a. Perform ? DefinePropertyOrThrow(this,
      // %Intl%.[[FallbackSymbol]], PropertyDescriptor{ [[Value]]: format,
      // [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: false }).
      PropertyDescriptor desc;
      desc.set_value(format);
      desc.set_writable(false);
      desc.set_enumerable(false);
      desc.set_configurable(false);
      Maybe<bool> success = JSReceiver::DefineOwnProperty(
          isolate, rec, isolate->factory()->intl_fallback_symbol(), &desc,
          Just(kThrowOnError));
      MAYBE_RETURN(success, ReadOnlyRoots(isolate).exception());
      CHECK(success.FromJust());
      // b. b. Return this.
      return *receiver;
    }
  }
  // 6. Return format.
  return *format;
}

/**
 * Common code shared by ListFormat, RelativeTimeFormat, PluralRules, and
 * Segmenter
 */
template <class T>
Object DisallowCallConstructor(BuiltinArguments args, Isolate* isolate,
                               v8::Isolate::UseCounterFeature feature,
                               const char* method) {
  isolate->CountUsage(feature);

  // 1. If NewTarget is undefined, throw a TypeError exception.
  if (args.new_target()->IsUndefined(isolate)) {  // [[Call]]
    THROW_NEW_ERROR_RETURN_FAILURE(
        isolate,
        NewTypeError(MessageTemplate::kConstructorNotFunction,
                     isolate->factory()->NewStringFromAsciiChecked(method)));
  }
  // [[Construct]]
  Handle<JSFunction> target = args.target();
  Handle<JSReceiver> new_target = Handle<JSReceiver>::cast(args.new_target());

  Handle<Map> map;
  // 2. Let result be OrdinaryCreateFromConstructor(NewTarget,
  //    "%<T>Prototype%").
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
      isolate, map, JSFunction::GetDerivedMap(isolate, target, new_target));

  Handle<Object> locales = args.atOrUndefined(isolate, 1);
  Handle<Object> options = args.atOrUndefined(isolate, 2);

  // 3. Return New<T>(t, locales, options).
  RETURN_RESULT_OR_FAILURE(isolate, T::New(isolate, map, locales, options));
}

/**
 * Common code shared by Collator and V8BreakIterator
 */
template <class T>
Object CallOrConstructConstructor(BuiltinArguments args, Isolate* isolate,
                                  const char* method) {
  Handle<JSReceiver> new_target;

  if (args.new_target()->IsUndefined(isolate)) {
    new_target = args.target();
  } else {
    new_target = Handle<JSReceiver>::cast(args.new_target());
  }

  // [[Construct]]
  Handle<JSFunction> target = args.target();

  Handle<Object> locales = args.atOrUndefined(isolate, 1);
  Handle<Object> options = args.atOrUndefined(isolate, 2);

  Handle<Map> map;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
      isolate, map, JSFunction::GetDerivedMap(isolate, target, new_target));

  RETURN_RESULT_OR_FAILURE(isolate,
                           T::New(isolate, map, locales, options, method));
}
}  // namespace

// Intl.DisplayNames

BUILTIN(DisplayNamesConstructor) {
  HandleScope scope(isolate);

  return DisallowCallConstructor<JSDisplayNames>(
      args, isolate, v8::Isolate::UseCounterFeature::kDisplayNames,
      "Intl.DisplayNames");
}

BUILTIN(DisplayNamesPrototypeResolvedOptions) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSDisplayNames, holder,
                 "Intl.DisplayNames.prototype.resolvedOptions");
  return *JSDisplayNames::ResolvedOptions(isolate, holder);
}

BUILTIN(DisplayNamesSupportedLocalesOf) {
  HandleScope scope(isolate);
  Handle<Object> locales = args.atOrUndefined(isolate, 1);
  Handle<Object> options = args.atOrUndefined(isolate, 2);

  RETURN_RESULT_OR_FAILURE(
      isolate, Intl::SupportedLocalesOf(
                   isolate, "Intl.DisplayNames.supportedLocalesOf",
                   JSDisplayNames::GetAvailableLocales(), locales, options));
}

BUILTIN(DisplayNamesPrototypeOf) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSDisplayNames, holder, "Intl.DisplayNames.prototype.of");
  Handle<Object> code_obj = args.atOrUndefined(isolate, 1);

  RETURN_RESULT_OR_FAILURE(isolate,
                           JSDisplayNames::Of(isolate, holder, code_obj));
}

// Intl.NumberFormat

BUILTIN(NumberFormatConstructor) {
  HandleScope scope(isolate);

  return LegacyFormatConstructor<JSNumberFormat>(
      args, isolate, v8::Isolate::UseCounterFeature::kNumberFormat,
      isolate->intl_number_format_function(), "Intl.NumberFormat");
}

BUILTIN(NumberFormatPrototypeResolvedOptions) {
  HandleScope scope(isolate);
  const char* const method = "Intl.NumberFormat.prototype.resolvedOptions";

  // 1. Let nf be the this value.
  // 2. If Type(nf) is not Object, throw a TypeError exception.
  CHECK_RECEIVER(JSReceiver, number_format_holder, method);

  // 3. Let nf be ? UnwrapNumberFormat(nf)
  Handle<JSNumberFormat> number_format;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
      isolate, number_format,
      JSNumberFormat::UnwrapNumberFormat(isolate, number_format_holder));

  return *JSNumberFormat::ResolvedOptions(isolate, number_format);
}

BUILTIN(NumberFormatPrototypeFormatNumber) {
  const char* const method = "get Intl.NumberFormat.prototype.format";
  HandleScope scope(isolate);

  // 1. Let nf be the this value.
  // 2. If Type(nf) is not Object, throw a TypeError exception.
  CHECK_RECEIVER(JSReceiver, receiver, method);

  // 3. Let nf be ? UnwrapNumberFormat(nf).
  Handle<JSNumberFormat> number_format;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
      isolate, number_format,
      JSNumberFormat::UnwrapNumberFormat(isolate, receiver));

  Handle<Object> bound_format(number_format->bound_format(), isolate);

  // 4. If nf.[[BoundFormat]] is undefined, then
  if (!bound_format->IsUndefined(isolate)) {
    DCHECK(bound_format->IsJSFunction());
    // 5. Return nf.[[BoundFormat]].
    return *bound_format;
  }

  Handle<JSFunction> new_bound_format_function = CreateBoundFunction(
      isolate, number_format, Builtins::kNumberFormatInternalFormatNumber, 1);

  // 4. c. Set nf.[[BoundFormat]] to F.
  number_format->set_bound_format(*new_bound_format_function);

  // 5. Return nf.[[BoundFormat]].
  return *new_bound_format_function;
}

BUILTIN(NumberFormatInternalFormatNumber) {
  HandleScope scope(isolate);

  Handle<Context> context = Handle<Context>(isolate->context(), isolate);

  // 1. Let nf be F.[[NumberFormat]].
  // 2. Assert: Type(nf) is Object and nf has an
  //    [[InitializedNumberFormat]] internal slot.
  Handle<JSNumberFormat> number_format = Handle<JSNumberFormat>(
      JSNumberFormat::cast(context->get(
          static_cast<int>(Intl::BoundFunctionContextSlot::kBoundFunction))),
      isolate);

  // 3. If value is not provided, let value be undefined.
  Handle<Object> value = args.atOrUndefined(isolate, 1);

  // 4. Let x be ? ToNumeric(value).
  Handle<Object> numeric_obj;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, numeric_obj,
                                     Object::ToNumeric(isolate, value));

  icu::number::LocalizedNumberFormatter* icu_localized_number_formatter =
      number_format->icu_number_formatter().raw();
  CHECK_NOT_NULL(icu_localized_number_formatter);

  // Return FormatNumber(nf, x).
  RETURN_RESULT_OR_FAILURE(
      isolate, JSNumberFormat::FormatNumeric(
                   isolate, *icu_localized_number_formatter, numeric_obj));
}

BUILTIN(DateTimeFormatConstructor) {
  HandleScope scope(isolate);

  return LegacyFormatConstructor<JSDateTimeFormat>(
      args, isolate, v8::Isolate::UseCounterFeature::kDateTimeFormat,
      isolate->intl_date_time_format_function(), "Intl.DateTimeFormat");
}

BUILTIN(DateTimeFormatPrototypeFormat) {
  const char* const method = "get Intl.DateTimeFormat.prototype.format";
  HandleScope scope(isolate);

  // 1. Let dtf be this value.
  // 2. If Type(dtf) is not Object, throw a TypeError exception.
  CHECK_RECEIVER(JSReceiver, receiver, method);

  // 3. Let dtf be ? UnwrapDateTimeFormat(dtf).
  Handle<JSDateTimeFormat> format;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
      isolate, format,
      JSDateTimeFormat::UnwrapDateTimeFormat(isolate, receiver));

  Handle<Object> bound_format = Handle<Object>(format->bound_format(), isolate);

  // 4. If dtf.[[BoundFormat]] is undefined, then
  if (!bound_format->IsUndefined(isolate)) {
    DCHECK(bound_format->IsJSFunction());
    // 5. Return dtf.[[BoundFormat]].
    return *bound_format;
  }

  Handle<JSFunction> new_bound_format_function = CreateBoundFunction(
      isolate, format, Builtins::kDateTimeFormatInternalFormat, 1);

  // 4.c. Set dtf.[[BoundFormat]] to F.
  format->set_bound_format(*new_bound_format_function);

  // 5. Return dtf.[[BoundFormat]].
  return *new_bound_format_function;
}

BUILTIN(DateTimeFormatInternalFormat) {
  HandleScope scope(isolate);
  Handle<Context> context = Handle<Context>(isolate->context(), isolate);

  // 1. Let dtf be F.[[DateTimeFormat]].
  // 2. Assert: Type(dtf) is Object and dtf has an [[InitializedDateTimeFormat]]
  // internal slot.
  Handle<JSDateTimeFormat> date_format_holder = Handle<JSDateTimeFormat>(
      JSDateTimeFormat::cast(context->get(
          static_cast<int>(Intl::BoundFunctionContextSlot::kBoundFunction))),
      isolate);

  Handle<Object> date = args.atOrUndefined(isolate, 1);

  RETURN_RESULT_OR_FAILURE(isolate, JSDateTimeFormat::DateTimeFormat(
                                        isolate, date_format_holder, date));
}

BUILTIN(IntlGetCanonicalLocales) {
  HandleScope scope(isolate);
  Handle<Object> locales = args.atOrUndefined(isolate, 1);

  RETURN_RESULT_OR_FAILURE(isolate,
                           Intl::GetCanonicalLocales(isolate, locales));
}

BUILTIN(ListFormatConstructor) {
  HandleScope scope(isolate);

  return DisallowCallConstructor<JSListFormat>(
      args, isolate, v8::Isolate::UseCounterFeature::kListFormat,
      "Intl.ListFormat");
}

BUILTIN(ListFormatPrototypeResolvedOptions) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSListFormat, format_holder,
                 "Intl.ListFormat.prototype.resolvedOptions");
  return *JSListFormat::ResolvedOptions(isolate, format_holder);
}

BUILTIN(ListFormatSupportedLocalesOf) {
  HandleScope scope(isolate);
  Handle<Object> locales = args.atOrUndefined(isolate, 1);
  Handle<Object> options = args.atOrUndefined(isolate, 2);

  RETURN_RESULT_OR_FAILURE(
      isolate, Intl::SupportedLocalesOf(
                   isolate, "Intl.ListFormat.supportedLocalesOf",
                   JSListFormat::GetAvailableLocales(), locales, options));
}

// Intl.Locale implementation
BUILTIN(LocaleConstructor) {
  HandleScope scope(isolate);

  isolate->CountUsage(v8::Isolate::UseCounterFeature::kLocale);

  if (args.new_target()->IsUndefined(isolate)) {  // [[Call]]
    THROW_NEW_ERROR_RETURN_FAILURE(
        isolate, NewTypeError(MessageTemplate::kConstructorNotFunction,
                              isolate->factory()->NewStringFromAsciiChecked(
                                  "Intl.Locale")));
  }
  // [[Construct]]
  Handle<JSFunction> target = args.target();
  Handle<JSReceiver> new_target = Handle<JSReceiver>::cast(args.new_target());

  Handle<Object> tag = args.atOrUndefined(isolate, 1);
  Handle<Object> options = args.atOrUndefined(isolate, 2);

  Handle<Map> map;
  // 6. Let locale be ? OrdinaryCreateFromConstructor(NewTarget,
  // %LocalePrototype%, internalSlotsList).
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
      isolate, map, JSFunction::GetDerivedMap(isolate, target, new_target));

  // 7. If Type(tag) is not String or Object, throw a TypeError exception.
  if (!tag->IsString() && !tag->IsJSReceiver()) {
    THROW_NEW_ERROR_RETURN_FAILURE(
        isolate, NewTypeError(MessageTemplate::kLocaleNotEmpty));
  }

  Handle<String> locale_string;
  // 8. If Type(tag) is Object and tag has an [[InitializedLocale]] internal
  // slot, then
  if (tag->IsJSLocale()) {
    // a. Let tag be tag.[[Locale]].
    locale_string = JSLocale::ToString(isolate, Handle<JSLocale>::cast(tag));
  } else {  // 9. Else,
    // a. Let tag be ? ToString(tag).
    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, locale_string,
                                       Object::ToString(isolate, tag));
  }

  Handle<JSReceiver> options_object;
  // 10. If options is undefined, then
  if (options->IsUndefined(isolate)) {
    // a. Let options be ! ObjectCreate(null).
    options_object = isolate->factory()->NewJSObjectWithNullProto();
  } else {  // 11. Else
    // a. Let options be ? ToObject(options).
    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, options_object,
                                       Object::ToObject(isolate, options));
  }

  RETURN_RESULT_OR_FAILURE(
      isolate, JSLocale::New(isolate, map, locale_string, options_object));
}

BUILTIN(LocalePrototypeMaximize) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSLocale, locale, "Intl.Locale.prototype.maximize");
  RETURN_RESULT_OR_FAILURE(isolate, JSLocale::Maximize(isolate, locale));
}

BUILTIN(LocalePrototypeMinimize) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSLocale, locale, "Intl.Locale.prototype.minimize");
  RETURN_RESULT_OR_FAILURE(isolate, JSLocale::Minimize(isolate, locale));
}

BUILTIN(RelativeTimeFormatSupportedLocalesOf) {
  HandleScope scope(isolate);
  Handle<Object> locales = args.atOrUndefined(isolate, 1);
  Handle<Object> options = args.atOrUndefined(isolate, 2);

  RETURN_RESULT_OR_FAILURE(
      isolate,
      Intl::SupportedLocalesOf(
          isolate, "Intl.RelativeTimeFormat.supportedLocalesOf",
          JSRelativeTimeFormat::GetAvailableLocales(), locales, options));
}

BUILTIN(RelativeTimeFormatPrototypeFormat) {
  HandleScope scope(isolate);
  // 1. Let relativeTimeFormat be the this value.
  // 2. If Type(relativeTimeFormat) is not Object or relativeTimeFormat does not
  //    have an [[InitializedRelativeTimeFormat]] internal slot whose value is
  //    true, throw a TypeError exception.
  CHECK_RECEIVER(JSRelativeTimeFormat, format_holder,
                 "Intl.RelativeTimeFormat.prototype.format");
  Handle<Object> value_obj = args.atOrUndefined(isolate, 1);
  Handle<Object> unit_obj = args.atOrUndefined(isolate, 2);

  RETURN_RESULT_OR_FAILURE(
      isolate, JSRelativeTimeFormat::Format(isolate, value_obj, unit_obj,
                                            format_holder));
}

BUILTIN(RelativeTimeFormatPrototypeFormatToParts) {
  HandleScope scope(isolate);
  // 1. Let relativeTimeFormat be the this value.
  // 2. If Type(relativeTimeFormat) is not Object or relativeTimeFormat does not
  //    have an [[InitializedRelativeTimeFormat]] internal slot whose value is
  //    true, throw a TypeError exception.
  CHECK_RECEIVER(JSRelativeTimeFormat, format_holder,
                 "Intl.RelativeTimeFormat.prototype.formatToParts");
  Handle<Object> value_obj = args.atOrUndefined(isolate, 1);
  Handle<Object> unit_obj = args.atOrUndefined(isolate, 2);
  RETURN_RESULT_OR_FAILURE(
      isolate, JSRelativeTimeFormat::FormatToParts(isolate, value_obj, unit_obj,
                                                   format_holder));
}

// Locale getters.
BUILTIN(LocalePrototypeLanguage) {
  HandleScope scope(isolate);
  // CHECK_RECEIVER will case locale_holder to JSLocale.
  CHECK_RECEIVER(JSLocale, locale, "Intl.Locale.prototype.language");

  return *JSLocale::Language(isolate, locale);
}

BUILTIN(LocalePrototypeScript) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSLocale, locale, "Intl.Locale.prototype.script");

  return *JSLocale::Script(isolate, locale);
}

BUILTIN(LocalePrototypeRegion) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSLocale, locale, "Intl.Locale.prototype.region");

  return *JSLocale::Region(isolate, locale);
}

BUILTIN(LocalePrototypeBaseName) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSLocale, locale, "Intl.Locale.prototype.baseName");

  return *JSLocale::BaseName(isolate, locale);
}

BUILTIN(LocalePrototypeCalendar) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSLocale, locale, "Intl.Locale.prototype.calendar");

  return *JSLocale::Calendar(isolate, locale);
}

BUILTIN(LocalePrototypeCaseFirst) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSLocale, locale, "Intl.Locale.prototype.caseFirst");

  return *JSLocale::CaseFirst(isolate, locale);
}

BUILTIN(LocalePrototypeCollation) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSLocale, locale, "Intl.Locale.prototype.collation");

  return *JSLocale::Collation(isolate, locale);
}

BUILTIN(LocalePrototypeHourCycle) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSLocale, locale, "Intl.Locale.prototype.hourCycle");

  return *JSLocale::HourCycle(isolate, locale);
}

BUILTIN(LocalePrototypeNumeric) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSLocale, locale, "Intl.Locale.prototype.numeric");

  return *JSLocale::Numeric(isolate, locale);
}

BUILTIN(LocalePrototypeNumberingSystem) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSLocale, locale, "Intl.Locale.prototype.numberingSystem");

  return *JSLocale::NumberingSystem(isolate, locale);
}

BUILTIN(LocalePrototypeToString) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSLocale, locale, "Intl.Locale.prototype.toString");

  return *JSLocale::ToString(isolate, locale);
}

BUILTIN(RelativeTimeFormatConstructor) {
  HandleScope scope(isolate);

  return DisallowCallConstructor<JSRelativeTimeFormat>(
      args, isolate, v8::Isolate::UseCounterFeature::kRelativeTimeFormat,
      "Intl.RelativeTimeFormat");
}

BUILTIN(RelativeTimeFormatPrototypeResolvedOptions) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSRelativeTimeFormat, format_holder,
                 "Intl.RelativeTimeFormat.prototype.resolvedOptions");
  return *JSRelativeTimeFormat::ResolvedOptions(isolate, format_holder);
}

BUILTIN(StringPrototypeToLocaleLowerCase) {
  HandleScope scope(isolate);

  isolate->CountUsage(v8::Isolate::UseCounterFeature::kStringToLocaleLowerCase);

  TO_THIS_STRING(string, "String.prototype.toLocaleLowerCase");

  RETURN_RESULT_OR_FAILURE(
      isolate, Intl::StringLocaleConvertCase(isolate, string, false,
                                             args.atOrUndefined(isolate, 1)));
}

BUILTIN(StringPrototypeToLocaleUpperCase) {
  HandleScope scope(isolate);

  isolate->CountUsage(v8::Isolate::UseCounterFeature::kStringToLocaleUpperCase);

  TO_THIS_STRING(string, "String.prototype.toLocaleUpperCase");

  RETURN_RESULT_OR_FAILURE(
      isolate, Intl::StringLocaleConvertCase(isolate, string, true,
                                             args.atOrUndefined(isolate, 1)));
}

BUILTIN(PluralRulesConstructor) {
  HandleScope scope(isolate);

  return DisallowCallConstructor<JSPluralRules>(
      args, isolate, v8::Isolate::UseCounterFeature::kPluralRules,
      "Intl.PluralRules");
}

BUILTIN(PluralRulesPrototypeResolvedOptions) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSPluralRules, plural_rules_holder,
                 "Intl.PluralRules.prototype.resolvedOptions");
  return *JSPluralRules::ResolvedOptions(isolate, plural_rules_holder);
}

BUILTIN(PluralRulesPrototypeSelect) {
  HandleScope scope(isolate);

  // 1. Let pr be the this value.
  // 2. If Type(pr) is not Object, throw a TypeError exception.
  // 3. If pr does not have an [[InitializedPluralRules]] internal slot, throw a
  // TypeError exception.
  CHECK_RECEIVER(JSPluralRules, plural_rules,
                 "Intl.PluralRules.prototype.select");

  // 4. Let n be ? ToNumber(value).
  Handle<Object> number = args.atOrUndefined(isolate, 1);
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, number,
                                     Object::ToNumber(isolate, number));
  double number_double = number->Number();

  // 5. Return ? ResolvePlural(pr, n).
  RETURN_RESULT_OR_FAILURE(isolate, JSPluralRules::ResolvePlural(
                                        isolate, plural_rules, number_double));
}

BUILTIN(PluralRulesSupportedLocalesOf) {
  HandleScope scope(isolate);
  Handle<Object> locales = args.atOrUndefined(isolate, 1);
  Handle<Object> options = args.atOrUndefined(isolate, 2);

  RETURN_RESULT_OR_FAILURE(
      isolate, Intl::SupportedLocalesOf(
                   isolate, "Intl.PluralRules.supportedLocalesOf",
                   JSPluralRules::GetAvailableLocales(), locales, options));
}

BUILTIN(CollatorConstructor) {
  HandleScope scope(isolate);

  isolate->CountUsage(v8::Isolate::UseCounterFeature::kCollator);

  return CallOrConstructConstructor<JSCollator>(args, isolate, "Intl.Collator");
}

BUILTIN(CollatorPrototypeResolvedOptions) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSCollator, collator_holder,
                 "Intl.Collator.prototype.resolvedOptions");
  return *JSCollator::ResolvedOptions(isolate, collator_holder);
}

BUILTIN(CollatorSupportedLocalesOf) {
  HandleScope scope(isolate);
  Handle<Object> locales = args.atOrUndefined(isolate, 1);
  Handle<Object> options = args.atOrUndefined(isolate, 2);

  RETURN_RESULT_OR_FAILURE(
      isolate, Intl::SupportedLocalesOf(
                   isolate, "Intl.Collator.supportedLocalesOf",
                   JSCollator::GetAvailableLocales(), locales, options));
}

BUILTIN(CollatorPrototypeCompare) {
  const char* const method = "get Intl.Collator.prototype.compare";
  HandleScope scope(isolate);

  // 1. Let collator be this value.
  // 2. If Type(collator) is not Object, throw a TypeError exception.
  // 3. If collator does not have an [[InitializedCollator]] internal slot,
  // throw a TypeError exception.
  CHECK_RECEIVER(JSCollator, collator, method);

  // 4. If collator.[[BoundCompare]] is undefined, then
  Handle<Object> bound_compare(collator->bound_compare(), isolate);
  if (!bound_compare->IsUndefined(isolate)) {
    DCHECK(bound_compare->IsJSFunction());
    // 5. Return collator.[[BoundCompare]].
    return *bound_compare;
  }

  Handle<JSFunction> new_bound_compare_function = CreateBoundFunction(
      isolate, collator, Builtins::kCollatorInternalCompare, 2);

  // 4.c. Set collator.[[BoundCompare]] to F.
  collator->set_bound_compare(*new_bound_compare_function);

  // 5. Return collator.[[BoundCompare]].
  return *new_bound_compare_function;
}

BUILTIN(CollatorInternalCompare) {
  HandleScope scope(isolate);
  Handle<Context> context = Handle<Context>(isolate->context(), isolate);

  // 1. Let collator be F.[[Collator]].
  // 2. Assert: Type(collator) is Object and collator has an
  // [[InitializedCollator]] internal slot.
  Handle<JSCollator> collator = Handle<JSCollator>(
      JSCollator::cast(context->get(
          static_cast<int>(Intl::BoundFunctionContextSlot::kBoundFunction))),
      isolate);

  // 3. If x is not provided, let x be undefined.
  Handle<Object> x = args.atOrUndefined(isolate, 1);
  // 4. If y is not provided, let y be undefined.
  Handle<Object> y = args.atOrUndefined(isolate, 2);

  // 5. Let X be ? ToString(x).
  Handle<String> string_x;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, string_x,
                                     Object::ToString(isolate, x));
  // 6. Let Y be ? ToString(y).
  Handle<String> string_y;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, string_y,
                                     Object::ToString(isolate, y));

  // 7. Return CompareStrings(collator, X, Y).
  icu::Collator* icu_collator = collator->icu_collator().raw();
  CHECK_NOT_NULL(icu_collator);
  return *Intl::CompareStrings(isolate, *icu_collator, string_x, string_y);
}

// ecma402 #sec-%segmentiteratorprototype%.next
BUILTIN(SegmentIteratorPrototypeNext) {
  const char* const method = "%SegmentIterator.prototype%.next";
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSSegmentIterator, segment_iterator, method);

  RETURN_RESULT_OR_FAILURE(isolate,
                           JSSegmentIterator::Next(isolate, segment_iterator));
}

// ecma402 #sec-intl.segmenter
BUILTIN(SegmenterConstructor) {
  HandleScope scope(isolate);

  return DisallowCallConstructor<JSSegmenter>(
      args, isolate, v8::Isolate::UseCounterFeature::kSegmenter,
      "Intl.Segmenter");
}

// ecma402 #sec-intl.segmenter.supportedlocalesof
BUILTIN(SegmenterSupportedLocalesOf) {
  HandleScope scope(isolate);
  Handle<Object> locales = args.atOrUndefined(isolate, 1);
  Handle<Object> options = args.atOrUndefined(isolate, 2);

  RETURN_RESULT_OR_FAILURE(
      isolate, Intl::SupportedLocalesOf(
                   isolate, "Intl.Segmenter.supportedLocalesOf",
                   JSSegmenter::GetAvailableLocales(), locales, options));
}

// ecma402 #sec-intl.segmenter.prototype.resolvedoptions
BUILTIN(SegmenterPrototypeResolvedOptions) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSSegmenter, segmenter,
                 "Intl.Segmenter.prototype.resolvedOptions");
  return *JSSegmenter::ResolvedOptions(isolate, segmenter);
}

// ecma402 #sec-intl.segmenter.prototype.segment
BUILTIN(SegmenterPrototypeSegment) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSSegmenter, segmenter, "Intl.Segmenter.prototype.segment");
  Handle<Object> input_text = args.atOrUndefined(isolate, 1);
  // 3. Let string be ? ToString(string).
  Handle<String> string;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, string,
                                     Object::ToString(isolate, input_text));

  // 4. Return ? CreateSegmentsObject(segmenter, string).
  RETURN_RESULT_OR_FAILURE(isolate,
                           JSSegments::Create(isolate, segmenter, string));
}

// ecma402 #sec-%segmentsprototype%.containing
BUILTIN(SegmentsPrototypeContaining) {
  const char* const method = "%Segments.prototype%.containing";
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSSegments, segments, method);
  Handle<Object> index = args.atOrUndefined(isolate, 1);

  // 6. Let n be ? ToInteger(index).
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, index,
                                     Object::ToInteger(isolate, index));
  double const n = index->Number();

  RETURN_RESULT_OR_FAILURE(isolate,
                           JSSegments::Containing(isolate, segments, n));
}

// ecma402 #sec-%segmentsprototype%-@@iterator
BUILTIN(SegmentsPrototypeIterator) {
  const char* const method = "%SegmentIsPrototype%[@@iterator]";
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSSegments, segments, method);
  RETURN_RESULT_OR_FAILURE(
      isolate,
      JSSegmentIterator::Create(isolate, segments->icu_break_iterator().raw(),
                                segments->granularity()));
}

BUILTIN(V8BreakIteratorConstructor) {
  HandleScope scope(isolate);

  return CallOrConstructConstructor<JSV8BreakIterator>(args, isolate,
                                                       "Intl.v8BreakIterator");
}

BUILTIN(V8BreakIteratorPrototypeResolvedOptions) {
  HandleScope scope(isolate);
  CHECK_RECEIVER(JSV8BreakIterator, break_iterator,
                 "Intl.v8BreakIterator.prototype.resolvedOptions");
  return *JSV8BreakIterator::ResolvedOptions(isolate, break_iterator);
}

BUILTIN(V8BreakIteratorPrototypeAdoptText) {
  const char* const method = "get Intl.v8BreakIterator.prototype.adoptText";
  HandleScope scope(isolate);

  CHECK_RECEIVER(JSV8BreakIterator, break_iterator, method);

  Handle<Object> bound_adopt_text(break_iterator->bound_adopt_text(), isolate);
  if (!bound_adopt_text->IsUndefined(isolate)) {
    DCHECK(bound_adopt_text->IsJSFunction());
    return *bound_adopt_text;
  }

  Handle<JSFunction> new_bound_adopt_text_function = CreateBoundFunction(
      isolate, break_iterator, Builtins::kV8BreakIteratorInternalAdoptText, 1);
  break_iterator->set_bound_adopt_text(*new_bound_adopt_text_function);
  return *new_bound_adopt_text_function;
}

BUILTIN(V8BreakIteratorInternalAdoptText) {
  HandleScope scope(isolate);
  Handle<Context> context = Handle<Context>(isolate->context(), isolate);

  Handle<JSV8BreakIterator> break_iterator = Handle<JSV8BreakIterator>(
      JSV8BreakIterator::cast(context->get(
          static_cast<int>(Intl::BoundFunctionContextSlot::kBoundFunction))),
      isolate);

  Handle<Object> input_text = args.atOrUndefined(isolate, 1);
  Handle<String> text;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, text,
                                     Object::ToString(isolate, input_text));

  JSV8BreakIterator::AdoptText(isolate, break_iterator, text);
  return ReadOnlyRoots(isolate).undefined_value();
}

BUILTIN(V8BreakIteratorPrototypeFirst) {
  const char* const method = "get Intl.v8BreakIterator.prototype.first";
  HandleScope scope(isolate);

  CHECK_RECEIVER(JSV8BreakIterator, break_iterator, method);

  Handle<Object> bound_first(break_iterator->bound_first(), isolate);
  if (!bound_first->IsUndefined(isolate)) {
    DCHECK(bound_first->IsJSFunction());
    return *bound_first;
  }

  Handle<JSFunction> new_bound_first_function = CreateBoundFunction(
      isolate, break_iterator, Builtins::kV8BreakIteratorInternalFirst, 0);
  break_iterator->set_bound_first(*new_bound_first_function);
  return *new_bound_first_function;
}

BUILTIN(V8BreakIteratorInternalFirst) {
  HandleScope scope(isolate);
  Handle<Context> context = Handle<Context>(isolate->context(), isolate);

  Handle<JSV8BreakIterator> break_iterator = Handle<JSV8BreakIterator>(
      JSV8BreakIterator::cast(context->get(
          static_cast<int>(Intl::BoundFunctionContextSlot::kBoundFunction))),
      isolate);

  return *JSV8BreakIterator::First(isolate, break_iterator);
}

BUILTIN(V8BreakIteratorPrototypeNext) {
  const char* const method = "get Intl.v8BreakIterator.prototype.next";
  HandleScope scope(isolate);

  CHECK_RECEIVER(JSV8BreakIterator, break_iterator, method);

  Handle<Object> bound_next(break_iterator->bound_next(), isolate);
  if (!bound_next->IsUndefined(isolate)) {
    DCHECK(bound_next->IsJSFunction());
    return *bound_next;
  }

  Handle<JSFunction> new_bound_next_function = CreateBoundFunction(
      isolate, break_iterator, Builtins::kV8BreakIteratorInternalNext, 0);
  break_iterator->set_bound_next(*new_bound_next_function);
  return *new_bound_next_function;
}

BUILTIN(V8BreakIteratorInternalNext) {
  HandleScope scope(isolate);
  Handle<Context> context = Handle<Context>(isolate->context(), isolate);

  Handle<JSV8BreakIterator> break_iterator = Handle<JSV8BreakIterator>(
      JSV8BreakIterator::cast(context->get(
          static_cast<int>(Intl::BoundFunctionContextSlot::kBoundFunction))),
      isolate);
  return *JSV8BreakIterator::Next(isolate, break_iterator);
}

BUILTIN(V8BreakIteratorPrototypeCurrent) {
  const char* const method = "get Intl.v8BreakIterator.prototype.current";
  HandleScope scope(isolate);

  CHECK_RECEIVER(JSV8BreakIterator, break_iterator, method);

  Handle<Object> bound_current(break_iterator->bound_current(), isolate);
  if (!bound_current->IsUndefined(isolate)) {
    DCHECK(bound_current->IsJSFunction());
    return *bound_current;
  }

  Handle<JSFunction> new_bound_current_function = CreateBoundFunction(
      isolate, break_iterator, Builtins::kV8BreakIteratorInternalCurrent, 0);
  break_iterator->set_bound_current(*new_bound_current_function);
  return *new_bound_current_function;
}

BUILTIN(V8BreakIteratorInternalCurrent) {
  HandleScope scope(isolate);
  Handle<Context> context = Handle<Context>(isolate->context(), isolate);

  Handle<JSV8BreakIterator> break_iterator = Handle<JSV8BreakIterator>(
      JSV8BreakIterator::cast(context->get(
          static_cast<int>(Intl::BoundFunctionContextSlot::kBoundFunction))),
      isolate);
  return *JSV8BreakIterator::Current(isolate, break_iterator);
}

BUILTIN(V8BreakIteratorPrototypeBreakType) {
  const char* const method = "get Intl.v8BreakIterator.prototype.breakType";
  HandleScope scope(isolate);

  CHECK_RECEIVER(JSV8BreakIterator, break_iterator, method);

  Handle<Object> bound_break_type(break_iterator->bound_break_type(), isolate);
  if (!bound_break_type->IsUndefined(isolate)) {
    DCHECK(bound_break_type->IsJSFunction());
    return *bound_break_type;
  }

  Handle<JSFunction> new_bound_break_type_function = CreateBoundFunction(
      isolate, break_iterator, Builtins::kV8BreakIteratorInternalBreakType, 0);
  break_iterator->set_bound_break_type(*new_bound_break_type_function);
  return *new_bound_break_type_function;
}

BUILTIN(V8BreakIteratorInternalBreakType) {
  HandleScope scope(isolate);
  Handle<Context> context = Handle<Context>(isolate->context(), isolate);

  Handle<JSV8BreakIterator> break_iterator = Handle<JSV8BreakIterator>(
      JSV8BreakIterator::cast(context->get(
          static_cast<int>(Intl::BoundFunctionContextSlot::kBoundFunction))),
      isolate);
  return JSV8BreakIterator::BreakType(isolate, break_iterator);
}

}  // namespace internal
}  // namespace v8