Remove the redundant load on every context lookup.

src/prettyprinter.cc

 // Copyright 2006-2008 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 279 matching lines @@
   Print(" }");
 }
 
 
 void PrettyPrinter::VisitSlot(Slot* node) {
   switch (node->type()) {
     case Slot::PARAMETER:
       Print("parameter[%d]", node->index());
       break;
     case Slot::LOCAL:
-      Print("frame[%d]", node->index());
+      Print("local[%d]", node->index());
       break;
     case Slot::CONTEXT:
-      Print(".context[%d]", node->index());
+      Print("context[%d]", node->index());
       break;
     case Slot::LOOKUP:
-      Print(".context[");
+      Print("lookup[");
       PrintLiteral(node->var()->name(), false);
       Print("]");
       break;
     default:
       UNREACHABLE();
   }
 }
 
 
 void PrettyPrinter::VisitVariableProxy(VariableProxy* node) {
@@ skipping 675 matching lines @@
 
 void AstPrinter::VisitCatchExtensionObject(CatchExtensionObject* node) {
   IndentedScope indent("CatchExtensionObject");
   PrintIndentedVisit("KEY", node->key());
   PrintIndentedVisit("VALUE", node->value());
 }
 
 
 void AstPrinter::VisitSlot(Slot* node) {
   PrintIndented("SLOT ");
-  switch (node->type()) {
-    case Slot::PARAMETER:
-      Print("parameter[%d]", node->index());
-      break;
-    case Slot::LOCAL:
-      Print("frame[%d]", node->index());
-      break;
-    case Slot::CONTEXT:
-      Print(".context[%d]", node->index());
-      break;
-    case Slot::LOOKUP:
-      Print(".context[");
-      PrintLiteral(node->var()->name(), false);
-      Print("]");
-      break;
-    default:
-      UNREACHABLE();
-  }
+  PrettyPrinter::VisitSlot(node);
   Print("\n");
 }
 
 
 void AstPrinter::VisitVariableProxy(VariableProxy* node) {
   PrintLiteralWithModeIndented("VAR PROXY", node->AsVariable(), node->name(),
                                node->type());
   Variable* var = node->var();
   if (var != NULL && var->rewrite() != NULL) {
     IndentedScope indent;
@@ skipping 517 matching lines @@
     AddAttribute("mode", Variable::Mode2String(decl->mode()));
   }
   Visit(decl->proxy());
   if (decl->fun() != NULL) Visit(decl->fun());
 }
 
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal