Extend grokdump's dd command with a second optional parameter defining number of words to dump.

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 2789 matching lines @@
       if code < 128:
         string += chr(code)
       else:
         break
       address += 1
     if string == "":
       print "Not an ASCII string at %s" % self.reader.FormatIntPtr(address)
     else:
       print "%s\n" % string
 
-  def do_dd(self, address):
+  def do_dd(self, args):
     """
-     Interpret memory at the given address (if available) as a sequence
-     of words. Automatic alignment is not performed.
+     Interpret memory in the given region [address, address + num * word_size)
+     (if available) as a sequence of words. Automatic alignment is not performed.
+     If the num is not specified, a default value of 16 words is used.
+     Synopsis: dd 0x<address> 0x<num>
     """
-    start = int(address, 16)
+    args = args.split(' ')
+    start = int(args[0], 16)
+    num = int(args[1], 16) if len(args) > 1 else 0x10
     if (start & self.heap.ObjectAlignmentMask()) != 0:
       print "Warning: Dumping un-aligned memory, is this what you had in mind?"
     for slot in xrange(start,
-                       start + self.reader.PointerSize() * 10,
+                       start + self.reader.PointerSize() * num,
                        self.reader.PointerSize()):
       if not self.reader.IsValidAddress(slot):
         print "Address is not contained within the minidump!"
         return
       maybe_address = self.reader.ReadUIntPtr(slot)
       heap_object = self.padawan.SenseObject(maybe_address)
       print "%s: %s %s" % (self.reader.FormatIntPtr(slot),
                            self.reader.FormatIntPtr(maybe_address),
                            heap_object or '')
 
@@ skipping 320 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])