This change allows generating call-stubs for objects with normal (non-fast) o...

src/ic-inl.h

 // Copyright 2006-2008 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 62 matching lines @@
   return result;
 }
 
 
 void IC::SetTargetAtAddress(Address address, Code* target) {
   ASSERT(target->is_inline_cache_stub());
   Assembler::set_target_address_at(address, target->instruction_start());
 }
 
 
-Map* IC::GetCodeCacheMapForObject(Object* object) {
-  if (object->IsJSObject()) return JSObject::cast(object)->map();
+InlineCacheHolderFlag IC::GetCodeCacheForObject(Object* object,
+                                                JSObject* holder) {
+  if (object->IsJSObject()) {
+    return GetCodeCacheForObject(JSObject::cast(object), holder);
+  }
   // If the object is a value, we use the prototype map for the cache.
   ASSERT(object->IsString() || object->IsNumber() || object->IsBoolean());
-  return JSObject::cast(object->GetPrototype())->map();
+  return PROTOTYPE_MAP;
+}
+
+
+InlineCacheHolderFlag IC::GetCodeCacheForObject(JSObject* object,
+                                                JSObject* holder) {
+  // Fast-properties and global objects store stubs in their own maps.
+  // Slow properties objects use prototype's map (unless the property is its own
+  // when holder == object). It works because slow properties objects having
+  // the same prototype (or a prototype with the same map) and not having
+  // the property are interchangeable for such a stub.
+  if (holder != object &&
+      !object->HasFastProperties() &&
+      !object->IsJSGlobalProxy() &&
+      !object->IsJSGlobalObject()) {
+    return PROTOTYPE_MAP;
+  }
+  return OWN_MAP;
+}
+
+
+Map* IC::GetCodeCacheMap(Object* object, InlineCacheHolderFlag holder) {
+  Object* map_owner = (holder == OWN_MAP ? object : object->GetPrototype());
+  ASSERT(map_owner->IsJSObject());
+  return JSObject::cast(map_owner)->map();
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_IC_INL_H_