Add a single-element global positive and negative cache to...

src/objects.cc

 // Copyright 2006-2009 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 4882 matching lines @@
   ASSERT(value->IsJSObject());
 
   if (has_initial_map()) {
     initial_map()->set_prototype(value);
   } else {
     // Put the value in the initial map field until an initial map is
     // needed.  At that point, a new initial map is created and the
     // prototype is put into the initial map where it belongs.
     set_prototype_or_initial_map(value);
   }
+  Heap::ClearInstanceofCache();
   return value;
 }
 
 
 
 Object* JSFunction::SetPrototype(Object* value) {
   ASSERT(should_have_prototype());
   Object* construct_prototype = value;
 
   // If the value is not a JSObject, store the value in the map's
@@ skipping 681 matching lines @@
       current_proto = current_proto->GetPrototype();
     }
   }
 
   // Set the new prototype of the object.
   Object* new_map = real_receiver->map()->CopyDropTransitions();
   if (new_map->IsFailure()) return new_map;
   Map::cast(new_map)->set_prototype(value);
   real_receiver->set_map(Map::cast(new_map));
 
+  Heap::ClearInstanceofCache();
+
   return value;
 }
 
 
 bool JSObject::HasElementPostInterceptor(JSObject* receiver, uint32_t index) {
   switch (GetElementsKind()) {
     case FAST_ELEMENTS: {
       uint32_t length = IsJSArray() ?
           static_cast<uint32_t>
               (Smi::cast(JSArray::cast(this)->length())->value()) :
@@ skipping 2931 matching lines @@
   if (break_point_objects()->IsUndefined()) return 0;
   // Single beak point.
   if (!break_point_objects()->IsFixedArray()) return 1;
   // Multiple break points.
   return FixedArray::cast(break_point_objects())->length();
 }
 #endif
 
 
 } }  // namespace v8::internal