Symbols for type cells.

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 14830 matching lines @@
   CONVERT_ARG_HANDLE_CHECKED(Object, type_info, parameters_start + 1);
 #ifdef DEBUG
   if (!no_caller_args) {
     CONVERT_SMI_ARG_CHECKED(arg_count, parameters_start + 2);
     ASSERT(arg_count == caller_args->length());
   }
 #endif
 
   Handle<AllocationSite> site;
   if (!type_info.is_null() &&
-      *type_info != isolate->heap()->undefined_value()) {
+      !type_info.is_identical_to(
+          TypeFeedbackInfo::MegamorphicSentinel(isolate))) {
     site = Handle<AllocationSite>::cast(type_info);
     ASSERT(!site->SitePointsToLiteral());
   }
 
   return ArrayConstructorCommon(isolate,
                                 constructor,
                                 site,
                                 caller_args);
 }
 
@@ skipping 103 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