Print out line number and extension name when compilation of an extension fails.

src/isolate.cc

Index: src/isolate.cc
===================================================================
--- src/isolate.cc	(revision 9770)
+++ src/isolate.cc	(working copy)
@@ -1072,6 +1072,16 @@
       message_obj = MessageHandler::MakeMessageObject("uncaught_exception",
           location, HandleVector<Object>(&exception_handle, 1), stack_trace,
           stack_trace_object);
+    } else if (location != NULL && !location->script().is_null()) {
+      // We are bootstrapping and caught and error where the location is set

[Mads Ager (chromium), 2011/10/25 13:41:00]

and error -> an error 

+      // and we have a script for the location.
+      // In this case we could have an extension (or an internal error
+      // somewhere) and we print out the line number at which the error occured
+      // to the console for easier debugging.
+      int line_number = GetScriptLineNumberSafe(location->script(),
+                                                location->start_pos());
+      OS::PrintError("Extension or internal compilation error at line %d.\n",
+                     line_number);
     }
   }