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

   1 # Copyright (C) 2008-2022 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 import gdb
  21
  22
  23 def _iterator(pointer, len):
  24     start = pointer
  25     end = pointer + len
  26     while pointer != end:
  27         yield ("[%d]" % int(pointer - start), pointer.dereference())
  28         pointer += 1
  29
  30
  31 # Same as _iterator but can be told to raise an exception.
  32 def _iterator_except(pointer, len):
  33     start = pointer
  34     end = pointer + len
  35     while pointer != end:
  36         if exception_flag:
  37             raise gdb.MemoryError("hi bob")
  38         yield ("[%d]" % int(pointer - start), pointer.dereference())
  39         pointer += 1
  40
  41
  42 # Test returning a Value from a printer.
  43 class string_print(object):
  44     def __init__(self, val):
  45         self.val = val
  46
  47     def to_string(self):
  48         return self.val["whybother"]["contents"]
  49
  50
  51 # Test a class-based printer.
  52 class ContainerPrinter(object):
  53     def __init__(self, val):
  54         self.val = val
  55
  56     def to_string(self):
  57         return "container %s with %d elements" % (self.val["name"], self.val["len"])
  58
  59     def children(self):
  60         return _iterator(self.val["elements"], self.val["len"])
  61
  62     def display_hint(self):
  63         if self.val["is_map_p"] and self.val["is_array_p"]:
  64             raise Exception("invalid object state found in display_hint")
  65
  66         if self.val["is_map_p"]:
  67             return "map"
  68         elif self.val["is_array_p"]:
  69             return "array"
  70         else:
  71             return None
  72
  73
  74 # Treats a container as array.
  75 class ArrayPrinter(object):
  76     def __init__(self, val):
  77         self.val = val
  78
  79     def to_string(self):
  80         return "array %s with %d elements" % (self.val["name"], self.val["len"])
  81
  82     def children(self):
  83         return _iterator(self.val["elements"], self.val["len"])
  84
  85     def display_hint(self):
  86         return "array"
  87
  88
  89 # Flag to make NoStringContainerPrinter throw an exception.
  90 exception_flag = False
  91
  92 # Test a printer where to_string is None
  93 class NoStringContainerPrinter(object):
  94     def __init__(self, val):
  95         self.val = val
  96
  97     def to_string(self):
  98         return None
  99
 100     def children(self):
 101         return _iterator_except(self.val["elements"], self.val["len"])
 102
 103
 104 # See ToStringReturnsValueWrapper.
 105 class ToStringReturnsValueInner:
 106     def __init__(self, val):
 107         self.val = val
 108
 109     def to_string(self):
 110         return "Inner to_string {}".format(int(self.val["val"]))
 111
 112
 113 # Test a printer that returns a gdb.Value in its to_string.  That gdb.Value
 114 # also has its own pretty-printer.
 115 class ToStringReturnsValueWrapper:
 116     def __init__(self, val):
 117         self.val = val
 118
 119     def to_string(self):
 120         return self.val["inner"]
 121
 122
 123 class pp_s(object):
 124     def __init__(self, val):
 125         self.val = val
 126
 127     def to_string(self):
 128         a = self.val["a"]
 129         b = self.val["b"]
 130         if a.address != b:
 131             raise Exception("&a(%s) != b(%s)" % (str(a.address), str(b)))
 132         return " a=<" + str(self.val["a"]) + "> b=<" + str(self.val["b"]) + ">"
 133
 134
 135 class pp_ss(object):
 136     def __init__(self, val):
 137         self.val = val
 138
 139     def to_string(self):
 140         return "a=<" + str(self.val["a"]) + "> b=<" + str(self.val["b"]) + ">"
 141
 142
 143 class pp_sss(object):
 144     def __init__(self, val):
 145         self.val = val
 146
 147     def to_string(self):
 148         return "a=<" + str(self.val["a"]) + "> b=<" + str(self.val["b"]) + ">"
 149
 150
 151 class pp_multiple_virtual(object):
 152     def __init__(self, val):
 153         self.val = val
 154
 155     def to_string(self):
 156         return "pp value variable is: " + str(self.val["value"])
 157
 158
 159 class pp_vbase1(object):
 160     def __init__(self, val):
 161         self.val = val
 162
 163     def to_string(self):
 164         return "pp class name: " + self.val.type.tag
 165
 166
 167 class pp_nullstr(object):
 168     def __init__(self, val):
 169         self.val = val
 170
 171     def to_string(self):
 172         return self.val["s"].string(gdb.target_charset())
 173
 174
 175 class pp_ns(object):
 176     "Print a std::basic_string of some kind"
 177
 178     def __init__(self, val):
 179         self.val = val
 180
 181     def to_string(self):
 182         len = self.val["length"]
 183         return self.val["null_str"].string(gdb.target_charset(), length=len)
 184
 185     def display_hint(self):
 186         return "string"
 187
 188
 189 pp_ls_encoding = None
 190
 191
 192 class pp_ls(object):
 193     "Print a std::basic_string of some kind"
 194
 195     def __init__(self, val):
 196         self.val = val
 197
 198     def to_string(self):
 199         length = self.val["len"]
 200         if pp_ls_encoding is not None:
 201             if length >= 0:
 202                 return self.val["lazy_str"].lazy_string(
 203                     encoding=pp_ls_encoding, length=length
 204                 )
 205             else:
 206                 return self.val["lazy_str"].lazy_string(encoding=pp_ls_encoding)
 207         else:
 208             if length >= 0:
 209                 return self.val["lazy_str"].lazy_string(length=length)
 210             else:
 211                 return self.val["lazy_str"].lazy_string()
 212
 213     def display_hint(self):
 214         return "string"
 215
 216
 217 class pp_hint_error(object):
 218     "Throw error from display_hint"
 219
 220     def __init__(self, val):
 221         self.val = val
 222
 223     def to_string(self):
 224         return "hint_error_val"
 225
 226     def display_hint(self):
 227         raise Exception("hint failed")
 228
 229
 230 class pp_children_as_list(object):
 231     "Throw error from display_hint"
 232
 233     def __init__(self, val):
 234         self.val = val
 235
 236     def to_string(self):
 237         return "children_as_list_val"
 238
 239     def children(self):
 240         return [("one", 1)]
 241
 242
 243 class pp_outer(object):
 244     "Print struct outer"
 245
 246     def __init__(self, val):
 247         self.val = val
 248
 249     def to_string(self):
 250         return "x = %s" % self.val["x"]
 251
 252     def children(self):
 253         yield "s", self.val["s"]
 254         yield "x", self.val["x"]
 255
 256
 257 class MemoryErrorString(object):
 258     "Raise an error"
 259
 260     def __init__(self, val):
 261         self.val = val
 262
 263     def to_string(self):
 264         raise gdb.MemoryError("Cannot access memory.")
 265
 266     def display_hint(self):
 267         return "string"
 268
 269
 270 class pp_eval_type(object):
 271     def __init__(self, val):
 272         self.val = val
 273
 274     def to_string(self):
 275         gdb.execute("bt", to_string=True)
 276         return (
 277             "eval=<"
 278             + str(gdb.parse_and_eval("eval_func (123456789, 2, 3, 4, 5, 6, 7, 8)"))
 279             + ">"
 280         )
 281
 282
 283 class pp_int_typedef(object):
 284     def __init__(self, val):
 285         self.val = val
 286
 287     def to_string(self):
 288         return "type=%s, val=%s" % (self.val.type, int(self.val))
 289
 290
 291 class pp_int_typedef3(object):
 292     "A printer without a to_string method"
 293
 294     def __init__(self, val):
 295         self.val = val
 296
 297     def children(self):
 298         yield "s", 27
 299
 300
 301 def lookup_function(val):
 302     "Look-up and return a pretty-printer that can print val."
 303
 304     # Get the type.
 305     type = val.type
 306
 307     # If it points to a reference, get the reference.
 308     if type.code == gdb.TYPE_CODE_REF:
 309         type = type.target()
 310
 311     # Get the unqualified type, stripped of typedefs.
 312     type = type.unqualified().strip_typedefs()
 313
 314     # Get the type name.
 315     typename = type.tag
 316
 317     if typename is None:
 318         return None
 319
 320     # Iterate over local dictionary of types to determine
 321     # if a printer is registered for that type.  Return an
 322     # instantiation of the printer if found.
 323     for function in pretty_printers_dict:
 324         if function.match(typename):
 325             return pretty_printers_dict[function](val)
 326
 327     # Cannot find a pretty printer.  Return None.
 328
 329     return None
 330
 331
 332 def disable_lookup_function():
 333     lookup_function.enabled = False
 334
 335
 336 def enable_lookup_function():
 337     lookup_function.enabled = True
 338
 339
 340 # Lookup a printer for VAL in the typedefs dict.
 341 def lookup_typedefs_function(val):
 342     "Look-up and return a pretty-printer that can print val (typedefs)."
 343
 344     # Get the type.
 345     type = val.type
 346
 347     if type is None or type.name is None or type.code != gdb.TYPE_CODE_TYPEDEF:
 348         return None
 349
 350     # Iterate over local dictionary of typedef types to determine if a
 351     # printer is registered for that type.  Return an instantiation of
 352     # the printer if found.
 353     for function in typedefs_pretty_printers_dict:
 354         if function.match(type.name):
 355             return typedefs_pretty_printers_dict[function](val)
 356
 357     # Cannot find a pretty printer.
 358     return None
 359
 360
 361 def register_pretty_printers():
 362     pretty_printers_dict[re.compile("^struct s$")] = pp_s
 363     pretty_printers_dict[re.compile("^s$")] = pp_s
 364     pretty_printers_dict[re.compile("^S$")] = pp_s
 365
 366     pretty_printers_dict[re.compile("^struct ss$")] = pp_ss
 367     pretty_printers_dict[re.compile("^ss$")] = pp_ss
 368     pretty_printers_dict[re.compile("^const S &$")] = pp_s
 369     pretty_printers_dict[re.compile("^SSS$")] = pp_sss
 370
 371     pretty_printers_dict[re.compile("^VirtualTest$")] = pp_multiple_virtual
 372     pretty_printers_dict[re.compile("^Vbase1$")] = pp_vbase1
 373
 374     pretty_printers_dict[re.compile("^struct nullstr$")] = pp_nullstr
 375     pretty_printers_dict[re.compile("^nullstr$")] = pp_nullstr
 376
 377     # Note that we purposely omit the typedef names here.
 378     # Printer lookup is based on canonical name.
 379     # However, we do need both tagged and untagged variants, to handle
 380     # both the C and C++ cases.
 381     pretty_printers_dict[re.compile("^struct string_repr$")] = string_print
 382     pretty_printers_dict[re.compile("^struct container$")] = ContainerPrinter
 383     pretty_printers_dict[re.compile("^struct justchildren$")] = NoStringContainerPrinter
 384     pretty_printers_dict[re.compile("^string_repr$")] = string_print
 385     pretty_printers_dict[re.compile("^container$")] = ContainerPrinter
 386     pretty_printers_dict[re.compile("^justchildren$")] = NoStringContainerPrinter
 387
 388     pretty_printers_dict[
 389         re.compile("^struct to_string_returns_value_inner$")
 390     ] = ToStringReturnsValueInner
 391     pretty_printers_dict[
 392         re.compile("^to_string_returns_value_inner$")
 393     ] = ToStringReturnsValueInner
 394     pretty_printers_dict[
 395         re.compile("^struct to_string_returns_value_wrapper$")
 396     ] = ToStringReturnsValueWrapper
 397     pretty_printers_dict[
 398         re.compile("^to_string_returns_value_wrapper$")
 399     ] = ToStringReturnsValueWrapper
 400
 401     pretty_printers_dict[re.compile("^struct ns$")] = pp_ns
 402     pretty_printers_dict[re.compile("^ns$")] = pp_ns
 403
 404     pretty_printers_dict[re.compile("^struct lazystring$")] = pp_ls
 405     pretty_printers_dict[re.compile("^lazystring$")] = pp_ls
 406
 407     pretty_printers_dict[re.compile("^struct outerstruct$")] = pp_outer
 408     pretty_printers_dict[re.compile("^outerstruct$")] = pp_outer
 409
 410     pretty_printers_dict[re.compile("^struct hint_error$")] = pp_hint_error
 411     pretty_printers_dict[re.compile("^hint_error$")] = pp_hint_error
 412
 413     pretty_printers_dict[re.compile("^struct children_as_list$")] = pp_children_as_list
 414     pretty_printers_dict[re.compile("^children_as_list$")] = pp_children_as_list
 415
 416     pretty_printers_dict[re.compile("^memory_error$")] = MemoryErrorString
 417
 418     pretty_printers_dict[re.compile("^eval_type_s$")] = pp_eval_type
 419
 420     typedefs_pretty_printers_dict[re.compile("^int_type$")] = pp_int_typedef
 421     typedefs_pretty_printers_dict[re.compile("^int_type2$")] = pp_int_typedef
 422     typedefs_pretty_printers_dict[re.compile("^int_type3$")] = pp_int_typedef3
 423
 424
 425 # Dict for struct types with typedefs fully stripped.
 426 pretty_printers_dict = {}
 427 # Dict for typedef types.
 428 typedefs_pretty_printers_dict = {}
 429
 430 register_pretty_printers()
 431 gdb.pretty_printers.append(lookup_function)
 432 gdb.pretty_printers.append(lookup_typedefs_function)