[runtime] Migrate several Date builtins to C++.

src/objects.h

 // Copyright 2015 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_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 1949 matching lines @@
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSReceiver);
 };
 
 
 // The JSObject describes real heap allocated JavaScript objects with
 // properties.
 // Note that the map of JSObject changes during execution to enable inline
 // caching.
 class JSObject: public JSReceiver {
  public:
+  static MUST_USE_RESULT MaybeHandle<JSObject> New(
+      Handle<JSFunction> constructor, Handle<JSReceiver> new_target,
+      Handle<AllocationSite> site = Handle<AllocationSite>::null());
+
   // [properties]: Backing storage for properties.
   // properties is a FixedArray in the fast case and a Dictionary in the
   // slow case.
   DECL_ACCESSORS(properties, FixedArray)  // Get and set fast properties.
   inline void initialize_properties();
   inline bool HasFastProperties();
   // Gets slow properties for non-global objects.
   inline NameDictionary* property_dictionary();
   // Gets global object properties.
   inline GlobalDictionary* global_dictionary();
@@ skipping 5543 matching lines @@
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSValue);
 };
 
 
 class DateCache;
 
 // Representation for JS date objects.
 class JSDate: public JSObject {
  public:
+  static MUST_USE_RESULT MaybeHandle<JSDate> New(Handle<JSFunction> constructor,
+                                                 Handle<JSReceiver> new_target,
+                                                 double tv);
+
   // If one component is NaN, all of them are, indicating a NaN time value.
   // [value]: the time value.
   DECL_ACCESSORS(value, Object)
   // [year]: caches year. Either undefined, smi, or NaN.
   DECL_ACCESSORS(year, Object)
   // [month]: caches month. Either undefined, smi, or NaN.
   DECL_ACCESSORS(month, Object)
   // [day]: caches day. Either undefined, smi, or NaN.
   DECL_ACCESSORS(day, Object)
   // [weekday]: caches day of week. Either undefined, smi, or NaN.
   DECL_ACCESSORS(weekday, Object)
   // [hour]: caches hours. Either undefined, smi, or NaN.
   DECL_ACCESSORS(hour, Object)
   // [min]: caches minutes. Either undefined, smi, or NaN.
   DECL_ACCESSORS(min, Object)
   // [sec]: caches seconds. Either undefined, smi, or NaN.
   DECL_ACCESSORS(sec, Object)
   // [cache stamp]: sample of the date cache stamp at the
   // moment when chached fields were cached.
   DECL_ACCESSORS(cache_stamp, Object)
 
   DECLARE_CAST(JSDate)
 
+  // Returns the time value (UTC) identifying the current time.
+  static double CurrentTimeValue(Isolate* isolate);
+
   // Returns the date field with the specified index.
   // See FieldIndex for the list of date fields.
   static Object* GetField(Object* date, Smi* index);
 
   void SetValue(Object* value, bool is_value_nan);
 
   // ES6 section 20.3.4.45 Date.prototype [ @@toPrimitive ]
   static MUST_USE_RESULT MaybeHandle<Object> ToPrimitive(
       Handle<JSReceiver> receiver, Handle<Object> hint);
 
@@ skipping 3153 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_