[Intl] Refactor logic of CurrencyDigits to Intl:: for C++.

Bug: v8:7979
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: Idbda0c93f55fe8a9b560ee006a3ed7dcceb1a540
Reviewed-on: https://chromium-review.googlesource.com/1149442
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54708}

src/objects/intl-objects.cc

@@ -1719,5 +1719,20 @@ MaybeHandle<String> Intl::CanonicalizeLanguageTag(Isolate* isolate,
       .ToHandleChecked();
 }
 
+// ecma-402/#sec-currencydigits
+Handle<Smi> Intl::CurrencyDigits(Isolate* isolate, Handle<String> currency) {
+  v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
+  v8::String::Value currency_string(v8_isolate, v8::Utils::ToLocal(currency));
+  CHECK_NOT_NULL(*currency_string);
+
+  DisallowHeapAllocation no_gc;
+  UErrorCode status = U_ZERO_ERROR;
+  uint32_t fraction_digits = ucurr_getDefaultFractionDigits(
+      reinterpret_cast<const UChar*>(*currency_string), &status);
+  // For missing currency codes, default to the most common, 2
+  if (U_FAILURE(status)) fraction_digits = 2;
+  return Handle<Smi>(Smi::FromInt(fraction_digits), isolate);
+}
+
 }  // namespace internal
 }  // namespace v8

src/objects/intl-objects.h

@@ -302,6 +302,10 @@ class Intl {
   // Canonicalize the localeID.
   static MaybeHandle<String> CanonicalizeLanguageTag(Isolate* isolate,
                                                      Handle<Object> localeID);
+
+  // ecma-402/#sec-currencydigits
+  // The currency is expected to an all upper case string value.
+  static Handle<Smi> CurrencyDigits(Isolate* isolate, Handle<String> currency);
 };
 
 }  // namespace internal

src/runtime/runtime-intl.cc

@@ -258,20 +258,10 @@ RUNTIME_FUNCTION(Runtime_InternalNumberFormat) {
 }
 
 RUNTIME_FUNCTION(Runtime_CurrencyDigits) {
+  HandleScope scope(isolate);
   DCHECK_EQ(1, args.length());
-  v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
-
   CONVERT_ARG_HANDLE_CHECKED(String, currency, 0);
-
-  v8::String::Value currency_string(v8_isolate, v8::Utils::ToLocal(currency));
-
-  DisallowHeapAllocation no_gc;
-  UErrorCode status = U_ZERO_ERROR;
-  uint32_t fraction_digits = ucurr_getDefaultFractionDigits(
-      reinterpret_cast<const UChar*>(*currency_string), &status);
-  // For missing currency codes, default to the most common, 2
-  if (!U_SUCCESS(status)) fraction_digits = 2;
-  return Smi::FromInt(fraction_digits);
+  return *Intl::CurrencyDigits(isolate, currency);
 }
 
 RUNTIME_FUNCTION(Runtime_CreateCollator) {