Object.observe: generate change records for named properties.

src/ic.cc

 // 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 1359 matching lines @@
 
   // Check if the given name is an array index.
   uint32_t index;
   if (name->AsArrayIndex(&index)) {
     Handle<Object> result =
         JSObject::SetElement(receiver, index, value, NONE, strict_mode);
     RETURN_IF_EMPTY_HANDLE(isolate(), result);
     return *value;
   }
 
+  // Observed objects are always modified through the runtime.
+  if (FLAG_harmony_observation && receiver->map()->is_observed()) {
+    return receiver->SetProperty(*name, *value, NONE, strict_mode);
+  }
+
   // Use specialized code for setting the length of arrays with fast
   // properties.  Slow properties might indicate redefinition of the
   // length property.
   if (receiver->IsJSArray() &&
       name->Equals(isolate()->heap()->length_symbol()) &&
       Handle<JSArray>::cast(receiver)->AllowsSetElementsLength() &&
       receiver->HasFastProperties()) {
 #ifdef DEBUG
     if (FLAG_trace_ic) PrintF("[StoreIC : +#length /array]\n");
 #endif
@@ skipping 505 matching lines @@
     // Check if the given name is an array index.
     uint32_t index;
     if (name->AsArrayIndex(&index)) {
       Handle<Object> result =
           JSObject::SetElement(receiver, index, value, NONE, strict_mode);
       RETURN_IF_EMPTY_HANDLE(isolate(), result);
       return *value;
     }
 
     // Update inline cache and stub cache.
-    if (FLAG_use_ic && !receiver->IsJSGlobalProxy()) {
+    if (FLAG_use_ic && !receiver->IsJSGlobalProxy() &&
+        !(FLAG_harmony_observation && receiver->map()->is_observed())) {
       LookupResult lookup(isolate());
       if (LookupForWrite(receiver, name, &lookup)) {
         UpdateCaches(&lookup, state, strict_mode, receiver, name, value);
       }
     }
 
     // Set the property.
     return receiver->SetProperty(*name, *value, NONE, strict_mode);
   }
 
@@ skipping 778 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal