One some platforms nm spits out some strange internal symbols called $t, $d...

tools/linux-tick-processor.py

 #!/usr/bin/env python
 #
 # Copyright 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
@@ skipping 29 matching lines @@
     command = 'nm -C -n "%s"; nm -C -n -D "%s"' % (filename, filename)
     process = subprocess.Popen(command, shell=True,
                                stdout=subprocess.PIPE,
                                stderr=subprocess.STDOUT)
     pipe = process.stdout
     try:
       for line in pipe:
         row = re.match('^([0-9a-fA-F]{8}) . (.*)$', line)
         if row:
           addr = int(row.group(1), 16)
+          name = row.group(2);
           if addr < start and addr < end - start:
             addr += start
-          self.cpp_entries.Insert(addr, tickprocessor.CodeEntry(addr, row.group(2)))
+          if not re.match('^\$[a-z]$', name):
+            self.cpp_entries.Insert(addr, tickprocessor.CodeEntry(addr, name))
     finally:
       pipe.close()
 
 
 class LinuxCmdLineProcessor(tickprocessor.CmdLineProcessor):
 
   def GetRequiredArgsNames(self):
     return 'log_file'
 
   def ProcessRequiredArgs(self, args):
     if len(args) != 1:
       self.PrintUsageAndExit()
     else:
       self.log_file = args[0]
 
 
 def Main():
   cmdline_processor = LinuxCmdLineProcessor()
   cmdline_processor.ProcessArguments()
   tick_processor = LinuxTickProcessor()
   cmdline_processor.RunLogfileProcessing(tick_processor)
   tick_processor.PrintResults()
 
 
 if __name__ == '__main__':
   Main()