Generators return boxed values

src/full-codegen.h

 // 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
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   void VisitDeclarations(ZoneList<Declaration*>* declarations);
   void DeclareModules(Handle<FixedArray> descriptions);
   void DeclareGlobals(Handle<FixedArray> pairs);
   int DeclareGlobalsFlags();
 
   // Generate code to allocate all (including nested) modules and contexts.
   // Because of recursive linking and the presence of module alias declarations,
   // this has to be a separate pass _before_ populating or executing any module.
   void AllocateModules(ZoneList<Declaration*>* declarations);
 
+  // Generator code to return a fresh iterator result object.  The "value"
+  // property is set to a value popped from the stack, and "done" is set
+  // according to the argument.
+  void EmitReturnIteratorResult(bool done);
+
   // Try to perform a comparison as a fast inlined literal compare if
   // the operands allow it.  Returns true if the compare operations
   // has been matched and all code generated; false otherwise.
   bool TryLiteralCompare(CompareOperation* compare);
 
   // Platform-specific code for comparing the type of a value with
   // a given literal string.
   void EmitLiteralCompareTypeof(Expression* expr,
                                 Expression* sub_expr,
                                 Handle<String> check);
@@ skipping 440 matching lines @@
   }
 
  private:
   Zone* zone_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FULL_CODEGEN_H_