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

src/objects.h

 // 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.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 155 matching lines @@
   STORE_NO_TRANSITION_IGNORE_OUT_OF_BOUNDS,
   STORE_NO_TRANSITION_HANDLE_COW
 };
 
 
 // Valid hints for the abstract operation ToPrimitive,
 // implemented according to ES6, section 7.1.1.
 enum class ToPrimitiveHint { kDefault, kNumber, kString };
 
 
+// Valid hints for the abstract operation OrdinaryToPrimitive,
+// implemented according to ES6, section 7.1.1.
+enum class OrdinaryToPrimitiveHint { kNumber, kString };
+
+
 enum TypeofMode { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF };
 
 
 enum MutableMode {
   MUTABLE,
   IMMUTABLE
 };
 
 
 enum ExternalArrayType {
@@ skipping 1486 matching lines @@
 // JSObject and JSProxy.
 class JSReceiver: public HeapObject {
  public:
   DECLARE_CAST(JSReceiver)
 
   // ES6 section 7.1.1 ToPrimitive
   MUST_USE_RESULT static MaybeHandle<Object> ToPrimitive(
       Handle<JSReceiver> receiver,
       ToPrimitiveHint hint = ToPrimitiveHint::kDefault);
   MUST_USE_RESULT static MaybeHandle<Object> OrdinaryToPrimitive(
-      Handle<JSReceiver> receiver, Handle<String> hint);
+      Handle<JSReceiver> receiver, OrdinaryToPrimitiveHint hint);
 
   // Implementation of [[HasProperty]], ECMA-262 5th edition, section 8.12.6.
   MUST_USE_RESULT static inline Maybe<bool> HasProperty(
       Handle<JSReceiver> object, Handle<Name> name);
   MUST_USE_RESULT static inline Maybe<bool> HasOwnProperty(Handle<JSReceiver>,
                                                            Handle<Name> name);
   MUST_USE_RESULT static inline Maybe<bool> HasElement(
       Handle<JSReceiver> object, uint32_t index);
   MUST_USE_RESULT static inline Maybe<bool> HasOwnElement(
       Handle<JSReceiver> object, uint32_t index);
@@ skipping 5565 matching lines @@
   DECL_ACCESSORS(cache_stamp, Object)
 
   DECLARE_CAST(JSDate)
 
   // 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);
 
   // Dispatched behavior.
   DECLARE_PRINTER(JSDate)
   DECLARE_VERIFIER(JSDate)
 
   // The order is important. It must be kept in sync with date macros
   // in macros.py.
   enum FieldIndex {
     kDateValue,
     kYear,
@@ skipping 830 matching lines @@
   inline bool AsArrayIndex(uint32_t* index);
 
   // If the name is private, it can only name own properties.
   inline bool IsPrivate();
 
   // If the name is a non-flat string, this method returns a flat version of the
   // string. Otherwise it'll just return the input.
   static inline Handle<Name> Flatten(Handle<Name> name,
                                      PretenureFlag pretenure = NOT_TENURED);
 
+  // Return a string version of this name that is converted according to the
+  // rules described in ES6 section 9.2.11.
+  MUST_USE_RESULT static MaybeHandle<String> ToFunctionName(Handle<Name> name);
+
   DECLARE_CAST(Name)
 
   DECLARE_PRINTER(Name)
 #if TRACE_MAPS
   void NameShortPrint();
   int NameShortPrint(Vector<char> str);
 #endif
 
   // Layout description.
   static const int kHashFieldSlot = HeapObject::kHeaderSize;
@@ skipping 2242 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_