Add parser support for generators.

src/prettyprinter.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 335 matching lines @@
 }
 
 
 void PrettyPrinter::VisitAssignment(Assignment* node) {
   Visit(node->target());
   Print(" %s ", Token::String(node->op()));
   Visit(node->value());
 }
 
 
+void PrettyPrinter::VisitYield(Yield* node) {
+  Print("yield ");
+  Visit(node->expression());
+}
+
+
 void PrettyPrinter::VisitThrow(Throw* node) {
   Print("throw ");
   Visit(node->exception());
 }
 
 
 void PrettyPrinter::VisitProperty(Property* node) {
   Expression* key = node->key();
   Literal* literal = key->AsLiteral();
   if (literal != NULL && literal->handle()->IsInternalizedString()) {
@@ skipping 686 matching lines @@
 }
 
 
 void AstPrinter::VisitAssignment(Assignment* node) {
   IndentedScope indent(this, Token::Name(node->op()), node);
   Visit(node->target());
   Visit(node->value());
 }
 
 
+void AstPrinter::VisitYield(Yield* node) {
+  PrintIndentedVisit("YIELD", node->expression());
+}
+
+
 void AstPrinter::VisitThrow(Throw* node) {
   PrintIndentedVisit("THROW", node->exception());
 }
 
 
 void AstPrinter::VisitProperty(Property* node) {
   IndentedScope indent(this, "PROPERTY", node);
   Visit(node->obj());
   Literal* literal = node->key()->AsLiteral();
   if (literal != NULL && literal->handle()->IsInternalizedString()) {
@@ skipping 52 matching lines @@
 }
 
 
 void AstPrinter::VisitThisFunction(ThisFunction* node) {
   IndentedScope indent(this, "THIS-FUNCTION");
 }
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal