Insert explicit deoptimization for named loads that have "uninitialized" type feedback.

src/ast.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 381 matching lines @@
 bool FunctionDeclaration::IsInlineable() const {
   return false;
 }
 
 
 // ----------------------------------------------------------------------------
 // Recording of type feedback
 
 void Property::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
   // Record type feedback from the oracle in the AST.
+  is_uninitialized_ = oracle->LoadIsUninitialized(this);
+  if (is_uninitialized_) return;
+
   is_monomorphic_ = oracle->LoadIsMonomorphicNormal(this);
   receiver_types_.Clear();
   if (key()->IsPropertyName()) {
     if (oracle->LoadIsBuiltin(this, Builtins::kLoadIC_ArrayLength)) {
       is_array_length_ = true;
     } else if (oracle->LoadIsBuiltin(this, Builtins::kLoadIC_StringLength)) {
       is_string_length_ = true;
     } else if (oracle->LoadIsBuiltin(this,
                                      Builtins::kLoadIC_FunctionPrototype)) {
       is_function_prototype_ = true;
@@ skipping 741 matching lines @@
     OS::SNPrintF(buffer, "%d", Smi::cast(*handle_)->value());
     str = arr;
   } else {
     str = DoubleToCString(handle_->Number(), buffer);
   }
   return FACTORY->NewStringFromAscii(CStrVector(str));
 }
 
 
 } }  // namespace v8::internal