Allow all Names to be fast property names

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/329393005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21834 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ic.cc

@@ -1326,8 +1326,7 @@ MaybeHandle<Object> StoreIC::Store(Handle<Object> object,
       TRACE_IC("StoreIC", name);
     } else if (can_store) {
       UpdateCaches(&lookup, receiver, name, value);
-    } else if (!name->IsCacheable(isolate()) ||
-               lookup.IsNormal() ||
+    } else if (lookup.IsNormal() ||
                (lookup.IsField() && lookup.CanHoldValue(value))) {
       Handle<Code> stub = generic_stub();
       set_target(*stub);

src/objects.cc

@@ -1802,11 +1802,7 @@ MaybeHandle<Map> Map::CopyWithField(Handle<Map> map,
     return MaybeHandle<Map>();
   }
 
-  // Normalize the object if the name is an actual name (not the
-  // hidden strings) and is not a real identifier.
-  // Normalize the object if it will have too many fast properties.
   Isolate* isolate = map->GetIsolate();
-  if (!name->IsCacheable(isolate)) return MaybeHandle<Map>();
 
   // Compute the new index for new field.
   int index = map->NextFreePropertyIndex();
@@ -8403,30 +8399,6 @@ bool DescriptorArray::IsEqualTo(DescriptorArray* other) {
 #endif
 
 
-static bool IsIdentifier(UnicodeCache* cache, Name* name) {
-  // Checks whether the buffer contains an identifier (no escape).
-  if (!name->IsString()) return false;
-  String* string = String::cast(name);
-  if (string->length() == 0) return true;
-  ConsStringIteratorOp op;
-  StringCharacterStream stream(string, &op);
-  if (!cache->IsIdentifierStart(stream.GetNext())) {
-    return false;
-  }
-  while (stream.HasMore()) {
-    if (!cache->IsIdentifierPart(stream.GetNext())) {
-      return false;
-    }
-  }
-  return true;
-}
-
-
-bool Name::IsCacheable(Isolate* isolate) {
-  return IsSymbol() || IsIdentifier(isolate->unicode_cache(), this);
-}
-
-
 bool String::LooksValid() {
   if (!GetIsolate()->heap()->Contains(this)) return false;
   return true;

src/objects.h

@@ -8928,8 +8928,6 @@ class Name: public HeapObject {
   // Casting.
   static inline Name* cast(Object* obj);
 
-  bool IsCacheable(Isolate* isolate);
-
   DECLARE_PRINTER(Name)
 
   // Layout description.

test/mjsunit/fast-non-keyed.js

@@ -108,6 +108,6 @@ var obj3 = {};
 AddProps3(obj3);
 assertTrue(%HasFastProperties(obj3));
 
-var bad_name = {};
-bad_name[".foo"] = 0;
-assertFalse(%HasFastProperties(bad_name));
+var funny_name = {};
+funny_name[".foo"] = 0;
+assertTrue(%HasFastProperties(funny_name));