solenv/gdb/boost/optional.py

   1 # -*- tab-width: 4; indent-tabs-mode: nil; py-indent-offset: 4 -*-
   2 # GDB pretty printers for Boost.Optional.
   3 #
   4 # Copyright (C) 2012 Red Hat, Inc., David Tardon <dtardon@redhat.com>
   5 #
   6 # This file is part of boost-gdb-printers.
   7 #
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 3 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 import gdb
  22
  23 import boost.util.printing as printing
  24
  25 class OptionalPrinter:
  26
  27     def __init__(self, typename, value):
  28         self.typename = typename
  29         self.value = value
  30
  31     def to_string(self):
  32         if self.value['m_initialized']:
  33             data = self.value['m_storage']['dummy_']['data']
  34             ptr_type = self.value.type.template_argument(0).pointer()
  35             return "%s %s" % (self.typename, data.cast(ptr_type).dereference())
  36         else:
  37             return "empty " + self.typename
  38
  39 printer = None
  40
  41 def build_pretty_printers():
  42     global printer
  43
  44     if printer is not None:
  45         return
  46
  47     printer = printing.Printer("boost.optional")
  48
  49     printer.add('boost::optional', OptionalPrinter)
  50
  51 def register_pretty_printers(obj):
  52     printing.register_pretty_printer(printer, obj)
  53
  54 build_pretty_printers()
  55
  56 # vim:set filetype=python shiftwidth=4 softtabstop=4 expandtab: