Use a per-isolate cache for the date object JS bits

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5600 matching lines @@
 
 void v8::Date::DateTimeConfigurationChangeNotification(Isolate* isolate) {
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   ON_BAILOUT(i_isolate, "v8::Date::DateTimeConfigurationChangeNotification()",
              return);
   LOG_API(i_isolate, "Date::DateTimeConfigurationChangeNotification");
   ENTER_V8(i_isolate);
 
   i_isolate->date_cache()->ResetDateCache();
 
-  i::HandleScope scope(i_isolate);
-  // Get the function ResetDateCache (defined in date.js).
-  i::Handle<i::String> func_name_str =
-      i_isolate->factory()->InternalizeOneByteString(
-          STATIC_ASCII_VECTOR("ResetDateCache"));
-  i::MaybeObject* result =
-      i_isolate->js_builtins_object()->GetProperty(*func_name_str);
-  i::Object* object_func;
-  if (!result->ToObject(&object_func)) {
+  if (!i_isolate->eternal_handles()->Exists(
+          i::EternalHandles::DATE_CACHE_VERSION)) {
     return;
   }
-
-  if (object_func->IsJSFunction()) {
-    i::Handle<i::JSFunction> func =
-        i::Handle<i::JSFunction>(i::JSFunction::cast(object_func));
-
-    // Call ResetDateCache(0 but expect no exceptions:
-    bool caught_exception = false;
-    i::Execution::TryCall(func,
-                          i_isolate->js_builtins_object(),
-                          0,
-                          NULL,
-                          &caught_exception);
-  }
+  i::Handle<i::FixedArray> date_cache_version =
+      i::Handle<i::FixedArray>::cast(i_isolate->eternal_handles()->GetSingleton(
+          i::EternalHandles::DATE_CACHE_VERSION));
+  ASSERT_EQ(1, date_cache_version->length());
+  ASSERT(date_cache_version->get(0)->IsNumber());
+  date_cache_version->set(0, i::Smi::FromInt(
+                                 date_cache_version->get(0)->Number() + 1));
 }
 
 
 static i::Handle<i::String> RegExpFlagsToString(RegExp::Flags flags) {
   i::Isolate* isolate = i::Isolate::Current();
   uint8_t flags_buf[3];
   int num_flags = 0;
   if ((flags & RegExp::kGlobal) != 0) flags_buf[num_flags++] = 'g';
   if ((flags & RegExp::kMultiline) != 0) flags_buf[num_flags++] = 'm';
   if ((flags & RegExp::kIgnoreCase) != 0) flags_buf[num_flags++] = 'i';
@@ skipping 1687 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal