Filter out maps from different global context when collecting type feedback.

src/stub-cache.cc

 // Copyright 2011 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 859 matching lines @@
   }
   for (int j = 0; j < kSecondaryTableSize; j++) {
     secondary_[j].key = heap()->empty_string();
     secondary_[j].value = empty;
   }
 }
 
 
 void StubCache::CollectMatchingMaps(SmallMapList* types,
                                     String* name,
-                                    Code::Flags flags) {
+                                    Code::Flags flags,
+                                    Handle<Context> global_context) {
   for (int i = 0; i < kPrimaryTableSize; i++) {
     if (primary_[i].key == name) {
       Map* map = primary_[i].value->FindFirstMap();
       // Map can be NULL, if the stub is constant function call
       // with a primitive receiver.
       if (map == NULL) continue;
 
       int offset = PrimaryOffset(name, flags, map);
-      if (entry(primary_, offset) == &primary_[i]) {
+      if (entry(primary_, offset) == &primary_[i] &&
+          !TypeFeedbackOracle::CanRetainOtherContext(map, *global_context)) {
         types->Add(Handle<Map>(map));
       }
     }
   }
 
   for (int i = 0; i < kSecondaryTableSize; i++) {
     if (secondary_[i].key == name) {
       Map* map = secondary_[i].value->FindFirstMap();
       // Map can be NULL, if the stub is constant function call
       // with a primitive receiver.
       if (map == NULL) continue;
 
       // Lookup in primary table and skip duplicates.
       int primary_offset = PrimaryOffset(name, flags, map);
       Entry* primary_entry = entry(primary_, primary_offset);
       if (primary_entry->key == name) {
         Map* primary_map = primary_entry->value->FindFirstMap();
         if (map == primary_map) continue;
       }
 
       // Lookup in secondary table and add matches.
       int offset = SecondaryOffset(name, flags, primary_offset);
-      if (entry(secondary_, offset) == &secondary_[i]) {
+      if (entry(secondary_, offset) == &secondary_[i] &&
+          !TypeFeedbackOracle::CanRetainOtherContext(map, *global_context)) {
         types->Add(Handle<Map>(map));
       }
     }
   }
 }
 
 
 // ------------------------------------------------------------------------
 // StubCompiler implementation.
 
@@ skipping 583 matching lines @@
           Handle<FunctionTemplateInfo>(
               FunctionTemplateInfo::cast(signature->receiver()));
     }
   }
 
   is_simple_api_call_ = true;
 }
 
 
 } }  // namespace v8::internal