Calling a generator function returns a generator object

src/ast.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
@@ skipping 1944 matching lines @@
   bool is_monomorphic_ : 1;
   KeyedAccessStoreMode store_mode_ : 4;
   SmallMapList receiver_types_;
 };
 
 
 class Yield: public Expression {
  public:
   DECLARE_NODE_TYPE(Yield)
 
+  Expression* iterator() const { return iterator_; }
   Expression* expression() const { return expression_; }
   bool is_delegating_yield() const { return is_delegating_yield_; }
   virtual int position() const { return pos_; }
 
  protected:
   Yield(Isolate* isolate,
+        Expression* iterator,
         Expression* expression,
         bool is_delegating_yield,
         int pos)
       : Expression(isolate),
+        iterator_(iterator),
         expression_(expression),
         is_delegating_yield_(is_delegating_yield),
         pos_(pos) { }
 
  private:
+  Expression* iterator_;
   Expression* expression_;
   bool is_delegating_yield_;
   int pos_;
 };
 
 
 class Throw: public Expression {
  public:
   DECLARE_NODE_TYPE(Throw)
 
@@ skipping 961 matching lines @@
   Assignment* NewAssignment(Token::Value op,
                             Expression* target,
                             Expression* value,
                             int pos) {
     Assignment* assign =
         new(zone_) Assignment(isolate_, op, target, value, pos);
     assign->Init(isolate_, this);
     VISIT_AND_RETURN(Assignment, assign)
   }
 
-  Yield* NewYield(Expression* expression, bool is_delegating_yield, int pos) {
-    Yield* yield =
-        new(zone_) Yield(isolate_, expression, is_delegating_yield, pos);
+  Yield* NewYield(Expression *iterator, Expression* expression,
+                  bool is_delegating_yield, int pos) {
+    Yield* yield = new(zone_) Yield(isolate_, iterator, expression,
+                                    is_delegating_yield, pos);
     VISIT_AND_RETURN(Yield, yield)
   }
 
   Throw* NewThrow(Expression* exception, int pos) {
     Throw* t = new(zone_) Throw(isolate_, exception, pos);
     VISIT_AND_RETURN(Throw, t)
   }
 
   FunctionLiteral* NewFunctionLiteral(
       Handle<String> name,
@@ skipping 40 matching lines @@
  private:
   Isolate* isolate_;
   Zone* zone_;
   Visitor visitor_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_