Track representations of fields

src/property.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 47 matching lines @@
 
   Name* GetKey() { return key_; }
   Object* GetValue() { return value_; }
   PropertyDetails GetDetails() { return details_; }
 
 #ifdef OBJECT_PRINT
   void Print(FILE* out);
 #endif
 
   void SetEnumerationIndex(int index) {
+    StorageType storage = details_.storage_type();
     details_ = PropertyDetails(details_.attributes(), details_.type(), index);
+    details_ = details_.set_storage_type(storage);
   }
 
   void SetSortedKeyIndex(int index) { details_ = details_.set_pointer(index); }
 
+  void SetStorageType(StorageType storage) {
+    details_ = details_.set_storage_type(storage);
+  }
+
  private:
   Name* key_;
   Object* value_;
   PropertyDetails details_;
 
  protected:
   Descriptor() : details_(Smi::FromInt(0)) {}
 
   void Init(Name* key, Object* value, PropertyDetails details) {
     key_ = key;
@@ skipping 118 matching lines @@
 
   Isolate* isolate() const { return isolate_; }
 
   void DescriptorResult(JSObject* holder, PropertyDetails details, int number) {
     lookup_type_ = DESCRIPTOR_TYPE;
     holder_ = holder;
     details_ = details;
     number_ = number;
   }
 
+  bool CanStore(Handle<Object> value) {
+    return value->FitsStorage(details_.storage_type());
+  }
+
   void TransitionResult(JSObject* holder, int number) {
     lookup_type_ = TRANSITION_TYPE;
     details_ = PropertyDetails(NONE, TRANSITION);
     holder_ = holder;
     number_ = number;
   }
 
   void DictionaryResult(JSObject* holder, int entry) {
     lookup_type_ = DICTIONARY_TYPE;
     holder_ = holder;
@@ skipping 28 matching lines @@
   JSProxy* proxy() {
     ASSERT(IsFound());
     return JSProxy::cast(holder_);
   }
 
   PropertyType type() {
     ASSERT(IsFound());
     return details_.type();
   }
 
+  StorageType storage_type() {
+    ASSERT(IsFound());
+    return details_.storage_type();
+  }
+
   PropertyAttributes GetAttributes() {
     ASSERT(!IsTransition());
     ASSERT(IsFound());
     ASSERT(details_.type() != NONEXISTENT);
     return details_.attributes();
   }
 
   PropertyDetails GetPropertyDetails() {
     ASSERT(!IsTransition());
     return details_;
@@ skipping 208 matching lines @@
   JSReceiver* holder_;
   int number_;
   bool cacheable_;
   PropertyDetails details_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_PROPERTY_H_