When dumping the stack, try to print contents as ASCII

tools/grokdump.py

 #!/usr/bin/env python
 #
 # 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
@@ skipping 3085 matching lines @@
   if options.shell:
     try:
       InspectionShell(reader, heap).cmdloop("type help to get help")
     except KeyboardInterrupt:
       print "Kthxbye."
   elif not options.command:
     if reader.exception is not None:
       frame_pointer = reader.ExceptionFP()
       print "Annotated stack (from exception.esp to bottom):"
       for slot in xrange(stack_top, stack_bottom, reader.PointerSize()):
+        ascii_content = [c if c >= '\x20' and c <  '\x7f' else '.'
+                         for c in reader.ReadBytes(slot, reader.PointerSize())]
         maybe_address = reader.ReadUIntPtr(slot)
         heap_object = heap.FindObject(maybe_address)
         maybe_symbol = reader.FindSymbol(maybe_address)
         if slot == frame_pointer:
           maybe_symbol = "<---- frame pointer"
           frame_pointer = maybe_address
-        print "%s: %s %s" % (reader.FormatIntPtr(slot),
-                             reader.FormatIntPtr(maybe_address),
-                             maybe_symbol or "")
+        print "%s: %s %s %s" % (reader.FormatIntPtr(slot),
+                                reader.FormatIntPtr(maybe_address),
+                                "".join(ascii_content),
+                                maybe_symbol or "")
         if heap_object:
           heap_object.Print(Printer())
           print
 
   reader.Dispose()
 
 
 if __name__ == "__main__":
   parser = optparse.OptionParser(USAGE)
   parser.add_option("-s", "--shell", dest="shell", action="store_true",
@@ skipping 22 matching lines @@
     try:
       server = InspectionWebServer(PORT_NUMBER, options, args[0])
       print 'Started httpserver on port ' , PORT_NUMBER
       webbrowser.open('http://localhost:%i/summary.html' % PORT_NUMBER)
       server.serve_forever()
     except KeyboardInterrupt:
       print '^C received, shutting down the web server'
       server.socket.close()
   else:
     AnalyzeMinidump(options, args[0])