Add parser support for generators.

src/parser.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 461 matching lines @@
     kHasInitializers,
     kHasNoInitializers
   };
 
   class BlockState;
 
   class FunctionState BASE_EMBEDDED {
    public:
     FunctionState(Parser* parser,
                   Scope* scope,
+                  bool is_generator,
                   Isolate* isolate);
     ~FunctionState();
 
     int NextMaterializedLiteralIndex() {
       return next_materialized_literal_index_++;
     }
     int materialized_literal_count() {
       return next_materialized_literal_index_ - JSFunction::kLiteralsPrefixSize;
     }
 
@@ skipping 10 matching lines @@
     bool only_simple_this_property_assignments() {
       return only_simple_this_property_assignments_;
     }
     Handle<FixedArray> this_property_assignments() {
       return this_property_assignments_;
     }
 
     void AddProperty() { expected_property_count_++; }
     int expected_property_count() { return expected_property_count_; }
 
+    bool is_generator() const { return is_generator_; }
+
     AstNodeFactory<AstConstructionVisitor>* factory() { return &factory_; }
 
    private:
     // Used to assign an index to each literal that needs materialization in
     // the function.  Includes regexp literals, and boilerplate for object and
     // array literals.
     int next_materialized_literal_index_;
 
     // Used to assign a per-function index to try and catch handlers.
     int next_handler_index_;
 
     // Properties count estimation.
     int expected_property_count_;
 
+    // Indicates that this function is a generator.
+    bool is_generator_;
+
     // Keeps track of assignments to properties of this. Used for
     // optimizing constructors.
     bool only_simple_this_property_assignments_;
     Handle<FixedArray> this_property_assignments_;
 
     Parser* parser_;
     FunctionState* outer_function_state_;
     Scope* outer_scope_;
     int saved_ast_node_id_;
     AstNodeFactory<AstConstructionVisitor> factory_;
@@ skipping 93 matching lines @@
   Statement* ParseThrowStatement(bool* ok);
   Expression* MakeCatchContext(Handle<String> id, VariableProxy* value);
   TryStatement* ParseTryStatement(bool* ok);
   DebuggerStatement* ParseDebuggerStatement(bool* ok);
 
   // Support for hamony block scoped bindings.
   Block* ParseScopedBlock(ZoneStringList* labels, bool* ok);
 
   Expression* ParseExpression(bool accept_IN, bool* ok);
   Expression* ParseAssignmentExpression(bool accept_IN, bool* ok);
+  Expression* ParseYieldExpression(bool* ok);
   Expression* ParseConditionalExpression(bool accept_IN, bool* ok);
   Expression* ParseBinaryExpression(int prec, bool accept_IN, bool* ok);
   Expression* ParseUnaryExpression(bool* ok);
   Expression* ParsePostfixExpression(bool* ok);
   Expression* ParseLeftHandSideExpression(bool* ok);
   Expression* ParseNewExpression(bool* ok);
   Expression* ParseMemberExpression(bool* ok);
   Expression* ParseNewPrefix(PositionStack* stack, bool* ok);
   Expression* ParseMemberWithNewPrefixesExpression(PositionStack* stack,
                                                    bool* ok);
@@ skipping 23 matching lines @@
   // If the expression is a literal, return the literal value;
   // if the expression is a materialized literal and is simple return a
   // compile time value as encoded by CompileTimeValue::GetValue().
   // Otherwise, return undefined literal as the placeholder
   // in the object literal boilerplate.
   Handle<Object> GetBoilerplateValue(Expression* expression);
 
   ZoneList<Expression*>* ParseArguments(bool* ok);
   FunctionLiteral* ParseFunctionLiteral(Handle<String> var_name,
                                         bool name_is_reserved,
+                                        bool is_generator,
                                         int function_token_position,
                                         FunctionLiteral::Type type,
                                         bool* ok);
 
 
   // Magical syntax support.
   Expression* ParseV8Intrinsic(bool* ok);
 
   INLINE(Token::Value peek()) {
     if (stack_overflow_) return Token::ILLEGAL;
     return scanner().peek();
   }
 
   INLINE(Token::Value Next()) {
     // BUG 1215673: Find a thread safe way to set a stack limit in
     // pre-parse mode. Otherwise, we cannot safely pre-parse from other
     // threads.
     if (stack_overflow_) {
       return Token::ILLEGAL;
     }
     if (StackLimitCheck(isolate()).HasOverflowed()) {
       // Any further calls to Next or peek will return the illegal token.
       // The current call must return the next token, which might already
       // have been peek'ed.
       stack_overflow_ = true;
     }
     return scanner().Next();
   }
 
+  bool is_generator() const { return current_function_state_->is_generator(); }
+
   bool peek_any_identifier();
 
   INLINE(void Consume(Token::Value token));
   void Expect(Token::Value token, bool* ok);
   bool Check(Token::Value token);
   void ExpectSemicolon(bool* ok);
   void ExpectContextualKeyword(const char* keyword, bool* ok);
 
   Handle<String> LiteralString(PretenureFlag tenured) {
     if (scanner().is_literal_ascii()) {
@@ skipping 156 matching lines @@
  private:
   static const int kTypeSlot = 0;
   static const int kElementsSlot = 1;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(CompileTimeValue);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_