Add support for global variable references in toplevel code. We use...

src/compiler.cc

 // Copyright 2009 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 588 matching lines @@
 void CodeGenSelector::VisitSlot(Slot* expr) {
   Slot::Type type = expr->type();
   if (type != Slot::PARAMETER && type != Slot::LOCAL) {
     BAILOUT("non-parameter/non-local slot reference");
   }
 }
 
 
 void CodeGenSelector::VisitVariableProxy(VariableProxy* expr) {
   Expression* rewrite = expr->var()->rewrite();
-  if (rewrite == NULL) BAILOUT("global variable reference");
-  Visit(rewrite);
+  if (rewrite != NULL) Visit(rewrite);
 }
 
 
 void CodeGenSelector::VisitLiteral(Literal* expr) {
   // All literals are supported.
   expr->set_location(Location::Constant());
 }
 
 
 void CodeGenSelector::VisitRegExpLiteral(RegExpLiteral* expr) {
@@ skipping 89 matching lines @@
 
 void CodeGenSelector::VisitThisFunction(ThisFunction* expr) {
   BAILOUT("ThisFunction");
 }
 
 #undef BAILOUT
 #undef CHECK_BAILOUT
 
 
 } }  // namespace v8::internal