gdb/testsuite/gdb.python/py-bad-printers.py

   1 # Copyright (C) 2008-2019 Free Software Foundation, Inc.
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 3 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15
  16 # This file is part of the GDB testsuite.  It tests GDB's handling of
  17 # bad python pretty printers.
  18
  19 # Test a printer with a bad children iterator.
  20
  21 import re
  22 import gdb.printing
  23
  24
  25 class BadChildrenContainerPrinter1(object):
  26     """Children iterator doesn't return a tuple of two elements."""
  27
  28     def __init__(self, val):
  29         self.val = val
  30
  31     def to_string(self):
  32         return 'container %s with %d elements' % (self.val['name'], self.val['len'])
  33
  34     @staticmethod
  35     def _bad_iterator(pointer, len):
  36         start = pointer
  37         end = pointer + len
  38         while pointer != end:
  39             yield 'intentional violation of children iterator protocol'
  40             pointer += 1
  41
  42     def children(self):
  43         return self._bad_iterator(self.val['elements'], self.val['len'])
  44
  45
  46 class BadChildrenContainerPrinter2(object):
  47     """Children iterator returns a tuple of two elements with bad values."""
  48
  49     def __init__(self, val):
  50         self.val = val
  51
  52     def to_string(self):
  53         return 'container %s with %d elements' % (self.val['name'], self.val['len'])
  54
  55     @staticmethod
  56     def _bad_iterator(pointer, len):
  57         start = pointer
  58         end = pointer + len
  59         while pointer != end:
  60             # The first argument is supposed to be a string.
  61             yield (42, 'intentional violation of children iterator protocol')
  62             pointer += 1
  63
  64     def children(self):
  65         return self._bad_iterator(self.val['elements'], self.val['len'])
  66
  67
  68 def build_pretty_printer():
  69     pp = gdb.printing.RegexpCollectionPrettyPrinter("bad-printers")
  70
  71     pp.add_printer('container1', '^container$',
  72                    BadChildrenContainerPrinter1)
  73     pp.add_printer('container2', '^container$',
  74                    BadChildrenContainerPrinter2)
  75
  76     return pp
  77
  78
  79 my_pretty_printer = build_pretty_printer()
  80 gdb.printing.register_pretty_printer(gdb, my_pretty_printer)