Keep track of which maps are associated with prototype objects so we can tune the fast-case vs. has…

src/runtime.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 13455 matching lines @@
 ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(ExternalPixelElements)
 ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(ExternalArrayElements)
 ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(ExternalByteElements)
 ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(ExternalUnsignedByteElements)
 ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(ExternalShortElements)
 ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(ExternalUnsignedShortElements)
 ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(ExternalIntElements)
 ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(ExternalUnsignedIntElements)
 ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(ExternalFloatElements)
 ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(ExternalDoubleElements)
+// Properties test sitting with elements tests - not fooling anyone.
+ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION(FastProperties)
 
 #undef ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_HaveSameMap) {
   ASSERT(args.length() == 2);
   CONVERT_ARG_CHECKED(JSObject, obj1, 0);
   CONVERT_ARG_CHECKED(JSObject, obj2, 1);
   return isolate->heap()->ToBoolean(obj1->map() == obj2->map());
 }
@@ skipping 77 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal