[es6] Implement Date.prototype[@@toPrimitive] as C++ builtin.

src/builtins.cc

 // Copyright 2012 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.
 
 #include "src/builtins.h"
 
 #include "src/api.h"
 #include "src/api-natives.h"
 #include "src/arguments.h"
 #include "src/base/once.h"
@@ skipping 760 matching lines @@
     }
   }
 
   DCHECK(j == result_len);
 
   return *result_array;
 }
 
 
 // -----------------------------------------------------------------------------
+//
+
+
+// 20.3.4.45 Date.prototype [ @@toPrimitive ] ( hint )
+BUILTIN(DateToPrimitive) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(2, args.length());
+  if (!args.receiver()->IsJSReceiver()) {
+    THROW_NEW_ERROR_RETURN_FAILURE(
+        isolate, NewTypeError(MessageTemplate::kIncompatibleMethodReceiver,
+                              isolate->factory()->NewStringFromAsciiChecked(
+                                  "Date.prototype [ @@toPrimitive ]"),
+                              args.receiver()));
+  }
+  Handle<JSReceiver> receiver = args.at<JSReceiver>(0);
+  Handle<Object> hint = args.at<Object>(1);
+  Handle<Object> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
+                                     JSDate::ToPrimitive(receiver, hint));
+  return *result;
+}
+
+
+// -----------------------------------------------------------------------------
 // Throwers for restricted function properties and strict arguments object
 // properties
 
 
 BUILTIN(RestrictedFunctionPropertiesThrower) {
   HandleScope scope(isolate);
   THROW_NEW_ERROR_RETURN_FAILURE(
       isolate, NewTypeError(MessageTemplate::kRestrictedFunctionProperties));
 }
 
@@ skipping 587 matching lines @@
 BUILTIN_LIST_C(DEFINE_BUILTIN_ACCESSOR_C)
 BUILTIN_LIST_A(DEFINE_BUILTIN_ACCESSOR_A)
 BUILTIN_LIST_H(DEFINE_BUILTIN_ACCESSOR_H)
 BUILTIN_LIST_DEBUG_A(DEFINE_BUILTIN_ACCESSOR_A)
 #undef DEFINE_BUILTIN_ACCESSOR_C
 #undef DEFINE_BUILTIN_ACCESSOR_A
 
 
 }  // namespace internal
 }  // namespace v8