Add parser support for generators.

src/scopes.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 290 matching lines @@
   }
   bool outer_scope_calls_non_strict_eval() const {
     return outer_scope_calls_non_strict_eval_;
   }
 
   // Is this scope inside a with statement.
   bool inside_with() const { return scope_inside_with_; }
   // Does this scope contain a with statement.
   bool contains_with() const { return scope_contains_with_; }
 
+  // If this scope is in a function that is a generator.
+  bool inside_generator() const { return scope_inside_generator_; }
+  void set_inside_generator(bool inside) { scope_inside_generator_ = inside; }
+
   // ---------------------------------------------------------------------------
   // Accessors.
 
   // The type of this scope.
   ScopeType type() const { return type_; }
 
   // The language mode of this scope.
   LanguageMode language_mode() const { return language_mode_; }
 
   // The variable corresponding the 'this' value.
@@ skipping 153 matching lines @@
 
   // Illegal redeclaration.
   Expression* illegal_redecl_;
 
   // Scope-specific information computed during parsing.
   //
   // This scope is inside a 'with' of some outer scope.
   bool scope_inside_with_;
   // This scope contains a 'with' statement.
   bool scope_contains_with_;
+  // This scope is in a function that is a generator.
+  bool scope_inside_generator_;
   // This scope or a nested catch scope or with scope contain an 'eval' call. At
   // the 'eval' call site this scope is the declaration scope.
   bool scope_calls_eval_;
   // The language mode of this scope.
   LanguageMode language_mode_;
   // Source positions.
   int start_position_;
   int end_position_;
 
   // Computed via PropagateScopeInfo.
@@ skipping 134 matching lines @@
   void SetDefaults(ScopeType type,
                    Scope* outer_scope,
                    Handle<ScopeInfo> scope_info);
 
   Zone* zone_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCOPES_H_