ES6 symbols: Introduce Symbol class, along with abstract Name class

src/objects-printer.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 58 matching lines @@
 void HeapObject::HeapObjectPrint(FILE* out) {
   InstanceType instance_type = map()->instance_type();
 
   HandleScope scope;
   if (instance_type < FIRST_NONSTRING_TYPE) {
     String::cast(this)->StringPrint(out);
     return;
   }
 
   switch (instance_type) {
+    case SYMBOL_TYPE:
+      Symbol::cast(this)->SymbolPrint(out);
+      break;
     case MAP_TYPE:
       Map::cast(this)->MapPrint(out);
       break;
     case HEAP_NUMBER_TYPE:
       HeapNumber::cast(this)->HeapNumberPrint(out);
       break;
     case FIXED_DOUBLE_ARRAY_TYPE:
       FixedDoubleArray::cast(this)->FixedDoubleArrayPrint(out);
       break;
     case FIXED_ARRAY_TYPE:
@@ skipping 381 matching lines @@
   PrintElements(out);
   PrintF(out, " }\n");
 }
 
 
 static const char* TypeToString(InstanceType type) {
   switch (type) {
     case INVALID_TYPE: return "INVALID";
     case MAP_TYPE: return "MAP";
     case HEAP_NUMBER_TYPE: return "HEAP_NUMBER";
+    case SYMBOL_TYPE: return "SYMBOL";
     case STRING_TYPE: return "TWO_BYTE_STRING";
     case ASCII_STRING_TYPE: return "ASCII_STRING";
     case CONS_STRING_TYPE:
     case CONS_ASCII_STRING_TYPE:
       return "CONS_STRING";
     case EXTERNAL_STRING_TYPE:
     case EXTERNAL_ASCII_STRING_TYPE:
     case EXTERNAL_STRING_WITH_ASCII_DATA_TYPE:
       return "EXTERNAL_STRING";
     case SHORT_EXTERNAL_STRING_TYPE:
@@ skipping 631 matching lines @@
     }
   }
   PrintF(out, "\n");
 }
 
 
 #endif  // OBJECT_PRINT
 
 
 } }  // namespace v8::internal