Prevent grokdump from crying about invalid input.

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 2018 matching lines @@
   def do_sh(self, none):
     """
      Search for the V8 Heap object in all available memory regions. You
      might get lucky and find this rare treasure full of invaluable
      information.
     """
     raise NotImplementedError
 
   def do_u(self, args):
     """
-     u 0x<address> 0x<size>
-     Unassemble memory in the region [address, address + size)
+     Unassemble memory in the region [address, address + size). If the
+     size is not specified, a default value of 32 bytes is used.
+     Synopsis: u 0x<address> 0x<size>
     """
     args = args.split(' ')
     start = int(args[0], 16)
-    size = int(args[1], 16)
+    size = int(args[1], 16) if len(args) > 1 else 0x20
+    if not self.reader.IsValidAddress(start):
+      print "Address is not contained within the minidump!"
+      return
     lines = self.reader.GetDisasmLines(start, size)
     for line in lines:
       print FormatDisasmLine(start, self.heap, line)
     print
 
+  def do_EOF(self, none):
+    raise KeyboardInterrupt
+
 EIP_PROXIMITY = 64
 
 CONTEXT_FOR_ARCH = {
     MD_CPU_ARCHITECTURE_AMD64:
       ['rax', 'rbx', 'rcx', 'rdx', 'rdi', 'rsi', 'rbp', 'rsp', 'rip',
        'r8', 'r9', 'r10', 'r11', 'r12', 'r13', 'r14', 'r15'],
     MD_CPU_ARCHITECTURE_ARM:
       ['r0', 'r1', 'r2', 'r3', 'r4', 'r5', 'r6', 'r7', 'r8', 'r9',
        'r10', 'r11', 'r12', 'sp', 'lr', 'pc'],
     MD_CPU_ARCHITECTURE_X86:
@@ skipping 64 matching lines @@
       print FormatDisasmLine(disasm_start, heap, line)
     print
 
   if heap is None:
     heap = V8Heap(reader, None)
 
   if options.full:
     FullDump(reader, heap)
 
   if options.shell:
-    InspectionShell(reader, heap).cmdloop("type help to get help")
+    try:
+      InspectionShell(reader, heap).cmdloop("type help to get help")
+    except KeyboardInterrupt:
+      print "Kthxbye."
   else:
     if reader.exception is not None:
       print "Annotated stack (from exception.esp to bottom):"
       for slot in xrange(stack_top, stack_bottom, reader.PointerSize()):
         maybe_address = reader.ReadUIntPtr(slot)
         heap_object = heap.FindObject(maybe_address)
         maybe_symbol = reader.FindSymbol(maybe_address)
         print "%s: %s %s" % (reader.FormatIntPtr(slot),
                              reader.FormatIntPtr(maybe_address),
                              maybe_symbol or "")
@@ skipping 18 matching lines @@
   options, args = parser.parse_args()
   if os.path.exists(options.objdump):
     disasm.OBJDUMP_BIN = options.objdump
     OBJDUMP_BIN = options.objdump
   else:
     print "Cannot find %s, falling back to default objdump" % options.objdump
   if len(args) != 1:
     parser.print_help()
     sys.exit(1)
   AnalyzeMinidump(options, args[0])