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

src/objects-inl.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 160 matching lines @@
 }
 
 
 bool Object::NonFailureIsHeapObject() {
   ASSERT(!this->IsFailure());
   return (reinterpret_cast<intptr_t>(this) & kSmiTagMask) != 0;
 }
 
 
 TYPE_CHECKER(HeapNumber, HEAP_NUMBER_TYPE)
+TYPE_CHECKER(Symbol, SYMBOL_TYPE)
+
+
+bool Object::IsName() {
+  return Object::IsHeapObject()
+    && HeapObject::cast(this)->map()->instance_type() <= LAST_NAME_TYPE;
+}
 
 
 bool Object::IsString() {
   return Object::IsHeapObject()
     && HeapObject::cast(this)->map()->instance_type() < FIRST_NONSTRING_TYPE;
 }
 
 
 bool Object::IsSpecObject() {
   return Object::IsHeapObject()
@@ skipping 2213 matching lines @@
 CAST_ACCESSOR(MapCache)
 CAST_ACCESSOR(String)
 CAST_ACCESSOR(SeqString)
 CAST_ACCESSOR(SeqOneByteString)
 CAST_ACCESSOR(SeqTwoByteString)
 CAST_ACCESSOR(SlicedString)
 CAST_ACCESSOR(ConsString)
 CAST_ACCESSOR(ExternalString)
 CAST_ACCESSOR(ExternalAsciiString)
 CAST_ACCESSOR(ExternalTwoByteString)
+CAST_ACCESSOR(Symbol)
 CAST_ACCESSOR(JSReceiver)
 CAST_ACCESSOR(JSObject)
 CAST_ACCESSOR(Smi)
 CAST_ACCESSOR(HeapObject)
 CAST_ACCESSOR(HeapNumber)
 CAST_ACCESSOR(Oddball)
 CAST_ACCESSOR(JSGlobalPropertyCell)
 CAST_ACCESSOR(SharedFunctionInfo)
 CAST_ACCESSOR(Map)
 CAST_ACCESSOR(JSFunction)
@@ skipping 36 matching lines @@
   return reinterpret_cast<HashTable*>(obj);
 }
 
 
 SMI_ACCESSORS(FixedArrayBase, length, kLengthOffset)
 SMI_ACCESSORS(FreeSpace, size, kSizeOffset)
 
 SMI_ACCESSORS(String, length, kLengthOffset)
 
 
-uint32_t String::hash_field() {
+uint32_t Name::hash_field() {
   return READ_UINT32_FIELD(this, kHashFieldOffset);
 }
 
 
-void String::set_hash_field(uint32_t value) {
+void Name::set_hash_field(uint32_t value) {
   WRITE_UINT32_FIELD(this, kHashFieldOffset, value);
 #if V8_HOST_ARCH_64_BIT
   WRITE_UINT32_FIELD(this, kHashFieldOffset + kIntSize, 0);
 #endif
 }
 
 
 bool String::Equals(String* other) {
   if (other == this) return true;
   if (StringShape(this).IsInternalized() &&
@@ skipping 2738 matching lines @@
   return StringDictionary::cast(properties());
 }
 
 
 SeededNumberDictionary* JSObject::element_dictionary() {
   ASSERT(HasDictionaryElements());
   return SeededNumberDictionary::cast(elements());
 }
 
 
-bool String::IsHashFieldComputed(uint32_t field) {
+bool Name::IsHashFieldComputed(uint32_t field) {
   return (field & kHashNotComputedMask) == 0;
 }
 
 
-bool String::HasHashCode() {
+bool Name::HasHashCode() {
   return IsHashFieldComputed(hash_field());
 }
 
 
-uint32_t String::Hash() {
+uint32_t Name::Hash() {
   // Fast case: has hash code already been computed?
   uint32_t field = hash_field();
   if (IsHashFieldComputed(field)) return field >> kHashShift;
-  // Slow case: compute hash code and set it.
-  return ComputeAndSetHash();
+  // Slow case: compute hash code and set it. Has to be a string.
+  return String::cast(this)->ComputeAndSetHash();
 }
 
 
 StringHasher::StringHasher(int length, uint32_t seed)
   : length_(length),
     raw_running_hash_(seed),
     array_index_(0),
     is_array_index_(0 < length_ && length_ <= String::kMaxArrayIndexSize),
     is_first_char_(true) {
   ASSERT(FLAG_randomize_hashes || raw_running_hash_ == 0);
@@ skipping 632 matching lines @@
 #undef WRITE_UINT32_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_