[Bug python/17136] New: 'info type-printers' causes an exception when there are per-objfile printers

["jwakely.gcc at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17136

            Bug ID: 17136
           Summary: 'info type-printers' causes an exception when there
                    are per-objfile printers
           Product: gdb
           Version: 7.7
            Status: NEW
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: jwakely.gcc at gmail dot com

Given this type printer defined somewhere like .gdbinit

class Printer(object):
  def __init__ (self):
    self.name = 'Printer'
    self.enabled = True

  class _recognizer(object):
    def recognize(self, type_obj):
      if type_obj.tag == "Foo":
        return "Bar"
      return None

  def instantiate(self):
    return self._recognizer()

if you debug any program then register the type printer with the current
objfile, running 'info type-printers' results in a python exception:

(gdb) start
Temporary breakpoint 1 at 0x4005b4: file bug.cc, line 4.
Starting program: /tmp/a.out 

Temporary breakpoint 1, main () at bug.cc:4
4         return 0;
(gdb) python gdb.types.register_type_printer(gdb.current_objfile(), Printer())
(gdb) info type-printers
Python Exception <type 'exceptions.AttributeError'> 'gdb.Objfile' object has no
attribute 'name': 
Error occurred in Python command: 'gdb.Objfile' object has no attribute 'name'

The exception doesn't happen if the type printer is registered globally, by
passing None instead of gdb.current_objfile().

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