gdb/testsuite/gdb.python/py-prettyprint.py

   1 # Copyright (C) 2008, 2009, 2010 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 python pretty
  17 # printers.
  18
  19 import re
  20
  21 # Test returning a Value from a printer.
  22 class string_print:
  23     def __init__(self, val):
  24         self.val = val
  25
  26     def to_string(self):
  27         return self.val['whybother']['contents']
  28
  29 # Test a class-based printer.
  30 class ContainerPrinter:
  31     class _iterator:
  32         def __init__ (self, pointer, len):
  33             self.start = pointer
  34             self.pointer = pointer
  35             self.end = pointer + len
  36
  37         def __iter__(self):
  38             return self
  39
  40         def next(self):
  41             if self.pointer == self.end:
  42                 raise StopIteration
  43             result = self.pointer
  44             self.pointer = self.pointer + 1
  45             return ('[%d]' % int (result - self.start), result.dereference())
  46
  47     def __init__(self, val):
  48         self.val = val
  49
  50     def to_string(self):
  51         return 'container %s with %d elements' % (self.val['name'], self.val['len'])
  52
  53     def children(self):
  54         return self._iterator(self.val['elements'], self.val['len'])
  55
  56 # Test a printer where to_string is None
  57 class NoStringContainerPrinter:
  58     class _iterator:
  59         def __init__ (self, pointer, len):
  60             self.start = pointer
  61             self.pointer = pointer
  62             self.end = pointer + len
  63
  64         def __iter__(self):
  65             return self
  66
  67         def next(self):
  68             if self.pointer == self.end:
  69                 raise StopIteration
  70             result = self.pointer
  71             self.pointer = self.pointer + 1
  72             return ('[%d]' % int (result - self.start), result.dereference())
  73
  74     def __init__(self, val):
  75         self.val = val
  76
  77     def to_string(self):
  78         return None
  79
  80     def children(self):
  81         return self._iterator(self.val['elements'], self.val['len'])
  82
  83 class pp_s:
  84     def __init__(self, val):
  85         self.val = val
  86
  87     def to_string(self):
  88         a = self.val["a"]
  89         b = self.val["b"]
  90         if a.address != b:
  91             raise Exception("&a(%s) != b(%s)" % (str(a.address), str(b)))
  92         return " a=<" + str(self.val["a"]) + "> b=<" + str(self.val["b"]) + ">"
  93
  94 class pp_ss:
  95     def __init__(self, val):
  96         self.val = val
  97
  98     def to_string(self):
  99         return "a=<" + str(self.val["a"]) + "> b=<" + str(self.val["b"]) + ">"
 100
 101 class pp_sss:
 102     def __init__(self, val):
 103         self.val = val
 104
 105     def to_string(self):
 106         return "a=<" + str(self.val['a']) + "> b=<" + str(self.val["b"]) + ">"
 107
 108 class pp_multiple_virtual:
 109     def __init__ (self, val):
 110         self.val = val
 111
 112     def to_string (self):
 113         return "pp value variable is: " + str (self.val['value'])
 114
 115 class pp_vbase1:
 116     def __init__ (self, val):
 117         self.val = val
 118
 119     def to_string (self):
 120         return "pp class name: " + self.val.type.tag
 121
 122 class pp_nullstr:
 123     def __init__(self, val):
 124         self.val = val
 125
 126     def to_string(self):
 127         return self.val['s'].string(gdb.target_charset())
 128
 129 class pp_ns:
 130     "Print a std::basic_string of some kind"
 131
 132     def __init__(self, val):
 133         self.val = val
 134
 135     def to_string(self):
 136         len = self.val['length']
 137         return self.val['null_str'].string (gdb.target_charset(), length = len)
 138
 139     def display_hint (self):
 140         return 'string'
 141
 142 class pp_ls:
 143     "Print a std::basic_string of some kind"
 144
 145     def __init__(self, val):
 146         self.val = val
 147
 148     def to_string(self):
 149         return self.val['lazy_str'].lazy_string()
 150
 151     def display_hint (self):
 152         return 'string'
 153
 154 class pp_outer:
 155     "Print struct outer"
 156
 157     def __init__ (self, val):
 158         self.val = val
 159
 160     def to_string (self):
 161         return "x = %s" % self.val['x']
 162
 163     def children (self):
 164         yield 's', self.val['s']
 165         yield 'x', self.val['x']
 166
 167 def lookup_function (val):
 168     "Look-up and return a pretty-printer that can print val."
 169
 170     # Get the type.
 171     type = val.type
 172
 173     # If it points to a reference, get the reference.
 174     if type.code == gdb.TYPE_CODE_REF:
 175         type = type.target ()
 176
 177     # Get the unqualified type, stripped of typedefs.
 178     type = type.unqualified ().strip_typedefs ()
 179
 180     # Get the type name.
 181     typename = type.tag
 182
 183     if typename == None:
 184         return None
 185
 186     # Iterate over local dictionary of types to determine
 187     # if a printer is registered for that type.  Return an
 188     # instantiation of the printer if found.
 189     for function in pretty_printers_dict:
 190         if function.match (typename):
 191             return pretty_printers_dict[function] (val)
 192
 193     # Cannot find a pretty printer.  Return None.
 194
 195     return None
 196
 197
 198 def register_pretty_printers ():
 199     pretty_printers_dict[re.compile ('^struct s$')]   = pp_s
 200     pretty_printers_dict[re.compile ('^s$')]   = pp_s
 201     pretty_printers_dict[re.compile ('^S$')]   = pp_s
 202
 203     pretty_printers_dict[re.compile ('^struct ss$')]  = pp_ss
 204     pretty_printers_dict[re.compile ('^ss$')]  = pp_ss
 205     pretty_printers_dict[re.compile ('^const S &$')]   = pp_s
 206     pretty_printers_dict[re.compile ('^SSS$')]  = pp_sss
 207
 208     pretty_printers_dict[re.compile ('^VirtualTest$')] =  pp_multiple_virtual
 209     pretty_printers_dict[re.compile ('^Vbase1$')] =  pp_vbase1
 210
 211     pretty_printers_dict[re.compile ('^struct nullstr$')] = pp_nullstr
 212     pretty_printers_dict[re.compile ('^nullstr$')] = pp_nullstr
 213
 214     # Note that we purposely omit the typedef names here.
 215     # Printer lookup is based on canonical name.
 216     # However, we do need both tagged and untagged variants, to handle
 217     # both the C and C++ cases.
 218     pretty_printers_dict[re.compile ('^struct string_repr$')] = string_print
 219     pretty_printers_dict[re.compile ('^struct container$')] = ContainerPrinter
 220     pretty_printers_dict[re.compile ('^struct justchildren$')] = NoStringContainerPrinter
 221     pretty_printers_dict[re.compile ('^string_repr$')] = string_print
 222     pretty_printers_dict[re.compile ('^container$')] = ContainerPrinter
 223     pretty_printers_dict[re.compile ('^justchildren$')] = NoStringContainerPrinter
 224
 225     pretty_printers_dict[re.compile ('^struct ns$')]  = pp_ns
 226     pretty_printers_dict[re.compile ('^ns$')]  = pp_ns
 227
 228     pretty_printers_dict[re.compile ('^struct lazystring$')]  = pp_ls
 229     pretty_printers_dict[re.compile ('^lazystring$')]  = pp_ls
 230
 231     pretty_printers_dict[re.compile ('^struct outerstruct$')]  = pp_outer
 232     pretty_printers_dict[re.compile ('^outerstruct$')]  = pp_outer
 233
 234 pretty_printers_dict = {}
 235
 236 register_pretty_printers ()
 237 gdb.pretty_printers.append (lookup_function)