Provide private symbols through internal APIs

src/objects.h

 // 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 105 matching lines @@
 //             - ExternalTwoByteString
 //           - InternalizedString
 //             - SeqInternalizedString
 //               - SeqOneByteInternalizedString
 //               - SeqTwoByteInternalizedString
 //             - ConsInternalizedString
 //             - ExternalInternalizedString
 //               - ExternalAsciiInternalizedString
 //               - ExternalTwoByteInternalizedString
 //         - Symbol
+//           - Private
 //       - HeapNumber
 //       - Cell
 //         - PropertyCell
 //       - Code
 //       - Map
 //       - Oddball
 //       - Foreign
 //       - SharedFunctionInfo
 //       - Struct
 //         - Box
@@ skipping 216 matching lines @@
   V(CONS_INTERNALIZED_STRING_TYPE)                                             \
   V(CONS_ASCII_INTERNALIZED_STRING_TYPE)                                       \
   V(EXTERNAL_INTERNALIZED_STRING_TYPE)                                         \
   V(EXTERNAL_ASCII_INTERNALIZED_STRING_TYPE)                                   \
   V(EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE)                      \
   V(SHORT_EXTERNAL_INTERNALIZED_STRING_TYPE)                                   \
   V(SHORT_EXTERNAL_ASCII_INTERNALIZED_STRING_TYPE)                             \
   V(SHORT_EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE)                \
                                                                                \
   V(SYMBOL_TYPE)                                                               \
+                                                                               \

[Yang, 2013/10/29 12:47:26]

stray edit?

[rossberg, 2013/10/29 15:08:19]

On purpose. :)

   V(MAP_TYPE)                                                                  \
   V(CODE_TYPE)                                                                 \
   V(ODDBALL_TYPE)                                                              \
   V(CELL_TYPE)                                                                 \
   V(PROPERTY_CELL_TYPE)                                                        \
                                                                                \
   V(HEAP_NUMBER_TYPE)                                                          \
   V(FOREIGN_TYPE)                                                              \
   V(BYTE_ARRAY_TYPE)                                                           \
   V(FREE_SPACE_TYPE)                                                           \
@@ skipping 312 matching lines @@
       | kNotInternalizedTag,
   SHORT_EXTERNAL_STRING_TYPE =
       SHORT_EXTERNAL_INTERNALIZED_STRING_TYPE | kNotInternalizedTag,
   SHORT_EXTERNAL_ASCII_STRING_TYPE =
       SHORT_EXTERNAL_ASCII_INTERNALIZED_STRING_TYPE | kNotInternalizedTag,
   SHORT_EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE =
       SHORT_EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE
       | kNotInternalizedTag,
 
   // Non-string names
-  SYMBOL_TYPE = kNotStringTag,  // LAST_NAME_TYPE, FIRST_NONSTRING_TYPE
+  SYMBOL_TYPE = kNotStringTag,  // FIRST_NONSTRING_TYPE, LAST_NAME_TYPE
 
   // Objects allocated in their own spaces (never in new space).
   MAP_TYPE,
   CODE_TYPE,
   ODDBALL_TYPE,
   CELL_TYPE,
   PROPERTY_CELL_TYPE,
 
   // "Data", objects that cannot contain non-map-word pointers to heap
   // objects.
@@ skipping 672 matching lines @@
   INLINE(bool IsSpecObject());
   INLINE(bool IsSpecFunction());
 
   // Oddball testing.
   INLINE(bool IsUndefined());
   INLINE(bool IsNull());
   INLINE(bool IsTheHole());  // Shadows MaybeObject's implementation.
   INLINE(bool IsUninitialized());
   INLINE(bool IsTrue());
   INLINE(bool IsFalse());
+  INLINE(bool IsPrivate());
   inline bool IsArgumentsMarker();
   inline bool NonFailureIsHeapObject();
 
   // Filler objects (fillers and free space objects).
   inline bool IsFiller();
 
   // Extract the number.
   inline double Number();
   inline bool IsNaN();
   bool ToInt32(int32_t* value);
@@ skipping 6926 matching lines @@
       kIsNotArrayIndexMask | kHashNotComputedMask;
 
  protected:
   static inline bool IsHashFieldComputed(uint32_t field);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(Name);
 };
 
 
-// ES6 symbols.
+// ES6 unique symbols.
 class Symbol: public Name {
  public:
-  // [name]: the print name of a symbol, or undefined if none.
+  // [name]: the print name of a symbol, or undefined if none,
+  // or for private symbols, a Box containing one of those.
   DECL_ACCESSORS(name, Object)
 
   // Casting.
   static inline Symbol* cast(Object* obj);
 
   // Dispatched behavior.
   DECLARE_PRINTER(Symbol)
   DECLARE_VERIFIER(Symbol)
 
   // Layout description.
   static const int kNameOffset = Name::kSize;
   static const int kSize = kNameOffset + kPointerSize;
 
   typedef FixedBodyDescriptor<kNameOffset, kNameOffset + kPointerSize, kSize>
           BodyDescriptor;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(Symbol);
 };
 
 
+// Private symbols.
+class Private: public Symbol {
+ public:
+  // The print name of a private symbol, or undefined if none.
+  DECL_ACCESSORS(name, Object)
+
+  // Casting.
+  static inline Private* cast(Object* obj);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(Private);
+};
+
+
 class ConsString;
 
 // The String abstract class captures JavaScript string values:
 //
 // Ecma-262:
 //  4.3.16 String Value
 //    A string value is a member of the type String and is a finite
 //    ordered sequence of zero or more 16-bit unsigned integer values.
 //
 // All string values have a length field.
@@ skipping 2069 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_