Repository navigation
Expand file tree
/
Copy pathtest_gdb.py
More file actions
1000 lines (863 loc) · 40.9 KB
/
Copy pathtest_gdb.py
File metadata and controls
1000 lines (863 loc) · 40.9 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
# Verify that gdb can pretty-print the various PyObject* types
#
# The code for testing gdb was adapted from similar work in Unladen Swallow's
# Lib/test/test_jit_gdb.py
import os
import platform
import re
import subprocess
import sys
import sysconfig
import textwrap
import unittest
from test import support
from test.support import run_unittest, findfile, python_is_optimized
def get_gdb_version():
try:
cmd = ["gdb", "-nx", "--version"]
proc = subprocess.Popen(cmd,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
universal_newlines=True)
with proc:
version, stderr = proc.communicate()
if proc.returncode:
raise Exception(f"Command {' '.join(cmd)!r} failed "
f"with exit code {proc.returncode}: "
f"stdout={version!r} stderr={stderr!r}")
except OSError:
# This is what "no gdb" looks like. There may, however, be other
# errors that manifest this way too.
raise unittest.SkipTest("Couldn't find gdb on the path")
# Regex to parse:
# 'GNU gdb (GDB; SUSE Linux Enterprise 12) 7.7\n' -> 7.7
# 'GNU gdb (GDB) Fedora 7.9.1-17.fc22\n' -> 7.9
# 'GNU gdb 6.1.1 [FreeBSD]\n' -> 6.1
# 'GNU gdb (GDB) Fedora (7.5.1-37.fc18)\n' -> 7.5
# 'HP gdb 6.7 for HP Itanium (32 or 64 bit) and target HP-UX 11iv2 and 11iv3.\n' -> 6.7
match = re.search(r"^(?:GNU|HP) gdb.*?\b(\d+)\.(\d+)", version)
if match is None:
raise Exception("unable to parse GDB version: %r" % version)
return (version, int(match.group(1)), int(match.group(2)))
gdb_version, gdb_major_version, gdb_minor_version = get_gdb_version()
if gdb_major_version < 7:
raise unittest.SkipTest("gdb versions before 7.0 didn't support python "
"embedding. Saw %s.%s:\n%s"
% (gdb_major_version, gdb_minor_version,
gdb_version))
if not sysconfig.is_python_build():
raise unittest.SkipTest("test_gdb only works on source builds at the moment.")
if 'Clang' in platform.python_compiler() and sys.platform == 'darwin':
raise unittest.SkipTest("test_gdb doesn't work correctly when python is"
" built with LLVM clang")
if ((sysconfig.get_config_var('PGO_PROF_USE_FLAG') or 'xxx') in
(sysconfig.get_config_var('PY_CORE_CFLAGS') or '')):
raise unittest.SkipTest("test_gdb is not reliable on PGO builds")
# Location of custom hooks file in a repository checkout.
checkout_hook_path = os.path.join(os.path.dirname(sys.executable),
'python-gdb.py')
PYTHONHASHSEED = '123'
def cet_protection():
cflags = sysconfig.get_config_var('CFLAGS')
if not cflags:
return False
flags = cflags.split()
# True if "-mcet -fcf-protection" options are found, but false
# if "-fcf-protection=none" or "-fcf-protection=return" is found.
return (('-mcet' in flags)
and any((flag.startswith('-fcf-protection')
and not flag.endswith(("=none", "=return")))
for flag in flags))
# Control-flow enforcement technology
CET_PROTECTION = cet_protection()
def run_gdb(*args, **env_vars):
"""Runs gdb in --batch mode with the additional arguments given by *args.
Returns its (stdout, stderr) decoded from utf-8 using the replace handler.
"""
if env_vars:
env = os.environ.copy()
env.update(env_vars)
else:
env = None
# -nx: Do not execute commands from any .gdbinit initialization files
# (issue #22188)
base_cmd = ('gdb', '--batch', '-nx')
if (gdb_major_version, gdb_minor_version) >= (7, 4):
base_cmd += ('-iex', 'add-auto-load-safe-path ' + checkout_hook_path)
proc = subprocess.Popen(base_cmd + args,
# Redirect stdin to prevent GDB from messing with
# the terminal settings
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
env=env)
with proc:
out, err = proc.communicate()
return out.decode('utf-8', 'replace'), err.decode('utf-8', 'replace')
# Verify that "gdb" was built with the embedded python support enabled:
gdbpy_version, _ = run_gdb("--eval-command=python import sys; print(sys.version_info)")
if not gdbpy_version:
raise unittest.SkipTest("gdb not built with embedded python support")
# Verify that "gdb" can load our custom hooks, as OS security settings may
# disallow this without a customized .gdbinit.
_, gdbpy_errors = run_gdb('--args', sys.executable)
if "auto-loading has been declined" in gdbpy_errors:
msg = "gdb security settings prevent use of custom hooks: "
raise unittest.SkipTest(msg + gdbpy_errors.rstrip())
def gdb_has_frame_select():
# Does this build of gdb have gdb.Frame.select ?
stdout, _ = run_gdb("--eval-command=python print(dir(gdb.Frame))")
m = re.match(r'.*\[(.*)\].*', stdout)
if not m:
raise unittest.SkipTest("Unable to parse output from gdb.Frame.select test")
gdb_frame_dir = m.group(1).split(', ')
return "'select'" in gdb_frame_dir
HAS_PYUP_PYDOWN = gdb_has_frame_select()
BREAKPOINT_FN='builtin_id'
@unittest.skipIf(support.PGO, "not useful for PGO")
class DebuggerTests(unittest.TestCase):
"""Test that the debugger can debug Python."""
def get_stack_trace(self, source=None, script=None,
breakpoint=BREAKPOINT_FN,
cmds_after_breakpoint=None,
import_site=False):
'''
Run 'python -c SOURCE' under gdb with a breakpoint.
Support injecting commands after the breakpoint is reached
Returns the stdout from gdb
cmds_after_breakpoint: if provided, a list of strings: gdb commands
'''
# We use "set breakpoint pending yes" to avoid blocking with a:
# Function "foo" not defined.
# Make breakpoint pending on future shared library load? (y or [n])
# error, which typically happens python is dynamically linked (the
# breakpoints of interest are to be found in the shared library)
# When this happens, we still get:
# Function "textiowrapper_write" not defined.
# emitted to stderr each time, alas.
# Initially I had "--eval-command=continue" here, but removed it to
# avoid repeated print breakpoints when traversing hierarchical data
# structures
# Generate a list of commands in gdb's language:
commands = ['set breakpoint pending yes',
'break %s' % breakpoint,
# The tests assume that the first frame of printed
# backtrace will not contain program counter,
# that is however not guaranteed by gdb
# therefore we need to use 'set print address off' to
# make sure the counter is not there. For example:
# #0 in PyObject_Print ...
# is assumed, but sometimes this can be e.g.
# #0 0x00003fffb7dd1798 in PyObject_Print ...
'set print address off',
'run']
# GDB as of 7.4 onwards can distinguish between the
# value of a variable at entry vs current value:
# http://sourceware.org/gdb/onlinedocs/gdb/Variables.html
# which leads to the selftests failing with errors like this:
# AssertionError: 'v@entry=()' != '()'
# Disable this:
if (gdb_major_version, gdb_minor_version) >= (7, 4):
commands += ['set print entry-values no']
if cmds_after_breakpoint:
if CET_PROTECTION:
# bpo-32962: When Python is compiled with -mcet
# -fcf-protection, function arguments are unusable before
# running the first instruction of the function entry point.
# The 'next' command makes the required first step.
commands += ['next']
commands += cmds_after_breakpoint
else:
commands += ['backtrace']
# print commands
# Use "commands" to generate the arguments with which to invoke "gdb":
args = ['--eval-command=%s' % cmd for cmd in commands]
args += ["--args",
sys.executable]
args.extend(subprocess._args_from_interpreter_flags())
if not import_site:
# -S suppresses the default 'import site'
args += ["-S"]
if source:
args += ["-c", source]
elif script:
args += [script]
# Use "args" to invoke gdb, capturing stdout, stderr:
out, err = run_gdb(*args, PYTHONHASHSEED=PYTHONHASHSEED)
for line in err.splitlines():
print(line, file=sys.stderr)
# bpo-34007: Sometimes some versions of the shared libraries that
# are part of the traceback are compiled in optimised mode and the
# Program Counter (PC) is not present, not allowing gdb to walk the
# frames back. When this happens, the Python bindings of gdb raise
# an exception, making the test impossible to succeed.
if "PC not saved" in err:
raise unittest.SkipTest("gdb cannot walk the frame object"
" because the Program Counter is"
" not present")
# bpo-40019: Skip the test if gdb failed to read debug information
# because the Python binary is optimized.
for pattern in (
'(frame information optimized out)',
'Unable to read information on python frame',
):
if pattern in out:
raise unittest.SkipTest(f"{pattern!r} found in gdb output")
return out
def get_gdb_repr(self, source,
cmds_after_breakpoint=None,
import_site=False):
# Given an input python source representation of data,
# run "python -c'id(DATA)'" under gdb with a breakpoint on
# builtin_id and scrape out gdb's representation of the "op"
# parameter, and verify that the gdb displays the same string
#
# Verify that the gdb displays the expected string
#
# For a nested structure, the first time we hit the breakpoint will
# give us the top-level structure
# NOTE: avoid decoding too much of the traceback as some
# undecodable characters may lurk there in optimized mode
# (issue #19743).
cmds_after_breakpoint = cmds_after_breakpoint or ["backtrace 1"]
gdb_output = self.get_stack_trace(source, breakpoint=BREAKPOINT_FN,
cmds_after_breakpoint=cmds_after_breakpoint,
import_site=import_site)
# gdb can insert additional '\n' and space characters in various places
# in its output, depending on the width of the terminal it's connected
# to (using its "wrap_here" function)
m = re.search(
# Match '#0 builtin_id(self=..., v=...)'
r'#0\s+builtin_id\s+\(self\=.*,\s+v=\s*(.*?)?\)'
# Match ' at Python/bltinmodule.c'.
# bpo-38239: builtin_id() is defined in Python/bltinmodule.c,
# but accept any "Directory\file.c" to support Link Time
# Optimization (LTO).
r'\s+at\s+\S*[A-Za-z]+/[A-Za-z0-9_-]+\.c',
gdb_output, re.DOTALL)
if not m:
self.fail('Unexpected gdb output: %r\n%s' % (gdb_output, gdb_output))
return m.group(1), gdb_output
def assertEndsWith(self, actual, exp_end):
'''Ensure that the given "actual" string ends with "exp_end"'''
self.assertTrue(actual.endswith(exp_end),
msg='%r did not end with %r' % (actual, exp_end))
def assertMultilineMatches(self, actual, pattern):
m = re.match(pattern, actual, re.DOTALL)
if not m:
self.fail(msg='%r did not match %r' % (actual, pattern))
def get_sample_script(self):
return findfile('gdb_sample.py')
class PrettyPrintTests(DebuggerTests):
def test_getting_backtrace(self):
gdb_output = self.get_stack_trace('id(42)')
self.assertTrue(BREAKPOINT_FN in gdb_output)
def assertGdbRepr(self, val, exp_repr=None):
# Ensure that gdb's rendering of the value in a debugged process
# matches repr(value) in this process:
gdb_repr, gdb_output = self.get_gdb_repr('id(' + ascii(val) + ')')
if not exp_repr:
exp_repr = repr(val)
self.assertEqual(gdb_repr, exp_repr,
('%r did not equal expected %r; full output was:\n%s'
% (gdb_repr, exp_repr, gdb_output)))
def test_int(self):
'Verify the pretty-printing of various int values'
self.assertGdbRepr(42)
self.assertGdbRepr(0)
self.assertGdbRepr(-7)
self.assertGdbRepr(1000000000000)
self.assertGdbRepr(-1000000000000000)
def test_singletons(self):
'Verify the pretty-printing of True, False and None'
self.assertGdbRepr(True)
self.assertGdbRepr(False)
self.assertGdbRepr(None)
def test_dicts(self):
'Verify the pretty-printing of dictionaries'
self.assertGdbRepr({})
self.assertGdbRepr({'foo': 'bar'}, "{'foo': 'bar'}")
# Python preserves insertion order since 3.6
self.assertGdbRepr({'foo': 'bar', 'douglas': 42}, "{'foo': 'bar', 'douglas': 42}")
def test_lists(self):
'Verify the pretty-printing of lists'
self.assertGdbRepr([])
self.assertGdbRepr(list(range(5)))
def test_bytes(self):
'Verify the pretty-printing of bytes'
self.assertGdbRepr(b'')
self.assertGdbRepr(b'And now for something hopefully the same')
self.assertGdbRepr(b'string with embedded NUL here \0 and then some more text')
self.assertGdbRepr(b'this is a tab:\t'
b' this is a slash-N:\n'
b' this is a slash-R:\r'
)
self.assertGdbRepr(b'this is byte 255:\xff and byte 128:\x80')
self.assertGdbRepr(bytes([b for b in range(255)]))
def test_strings(self):
'Verify the pretty-printing of unicode strings'
# We cannot simply call locale.getpreferredencoding() here,
# as GDB might have been linked against a different version
# of Python with a different encoding and coercion policy
# with respect to PEP 538 and PEP 540.
out, err = run_gdb(
'--eval-command',
'python import locale; print(locale.getpreferredencoding())')
encoding = out.rstrip()
if err or not encoding:
raise RuntimeError(
f'unable to determine the preferred encoding '
f'of embedded Python in GDB: {err}')
def check_repr(text):
try:
text.encode(encoding)
printable = True
except UnicodeEncodeError:
self.assertGdbRepr(text, ascii(text))
else:
self.assertGdbRepr(text)
self.assertGdbRepr('')
self.assertGdbRepr('And now for something hopefully the same')
self.assertGdbRepr('string with embedded NUL here \0 and then some more text')
# Test printing a single character:
# U+2620 SKULL AND CROSSBONES
check_repr('\u2620')
# Test printing a Japanese unicode string
# (I believe this reads "mojibake", using 3 characters from the CJK
# Unified Ideographs area, followed by U+3051 HIRAGANA LETTER KE)
check_repr('\u6587\u5b57\u5316\u3051')
# Test a character outside the BMP:
# U+1D121 MUSICAL SYMBOL C CLEF
# This is:
# UTF-8: 0xF0 0x9D 0x84 0xA1
# UTF-16: 0xD834 0xDD21
check_repr(chr(0x1D121))
def test_tuples(self):
'Verify the pretty-printing of tuples'
self.assertGdbRepr(tuple(), '()')
self.assertGdbRepr((1,), '(1,)')
self.assertGdbRepr(('foo', 'bar', 'baz'))
def test_sets(self):
'Verify the pretty-printing of sets'
if (gdb_major_version, gdb_minor_version) < (7, 3):
self.skipTest("pretty-printing of sets needs gdb 7.3 or later")
self.assertGdbRepr(set(), "set()")
self.assertGdbRepr(set(['a']), "{'a'}")
# PYTHONHASHSEED is need to get the exact frozenset item order
if not sys.flags.ignore_environment:
self.assertGdbRepr(set(['a', 'b']), "{'a', 'b'}")
self.assertGdbRepr(set([4, 5, 6]), "{4, 5, 6}")
# Ensure that we handle sets containing the "dummy" key value,
# which happens on deletion:
gdb_repr, gdb_output = self.get_gdb_repr('''s = set(['a','b'])
s.remove('a')
id(s)''')
self.assertEqual(gdb_repr, "{'b'}")
def test_frozensets(self):
'Verify the pretty-printing of frozensets'
if (gdb_major_version, gdb_minor_version) < (7, 3):
self.skipTest("pretty-printing of frozensets needs gdb 7.3 or later")
self.assertGdbRepr(frozenset(), "frozenset()")
self.assertGdbRepr(frozenset(['a']), "frozenset({'a'})")
# PYTHONHASHSEED is need to get the exact frozenset item order
if not sys.flags.ignore_environment:
self.assertGdbRepr(frozenset(['a', 'b']), "frozenset({'a', 'b'})")
self.assertGdbRepr(frozenset([4, 5, 6]), "frozenset({4, 5, 6})")
def test_exceptions(self):
# Test a RuntimeError
gdb_repr, gdb_output = self.get_gdb_repr('''
try:
raise RuntimeError("I am an error")
except RuntimeError as e:
id(e)
''')
self.assertEqual(gdb_repr,
"RuntimeError('I am an error',)")
# Test division by zero:
gdb_repr, gdb_output = self.get_gdb_repr('''
try:
a = 1 / 0
except ZeroDivisionError as e:
id(e)
''')
self.assertEqual(gdb_repr,
"ZeroDivisionError('division by zero',)")
def test_modern_class(self):
'Verify the pretty-printing of new-style class instances'
gdb_repr, gdb_output = self.get_gdb_repr('''
class Foo:
pass
foo = Foo()
foo.an_int = 42
id(foo)''')
m = re.match(r'<Foo\(an_int=42\) at remote 0x-?[0-9a-f]+>', gdb_repr)
self.assertTrue(m,
msg='Unexpected new-style class rendering %r' % gdb_repr)
def test_subclassing_list(self):
'Verify the pretty-printing of an instance of a list subclass'
gdb_repr, gdb_output = self.get_gdb_repr('''
class Foo(list):
pass
foo = Foo()
foo += [1, 2, 3]
foo.an_int = 42
id(foo)''')
m = re.match(r'<Foo\(an_int=42\) at remote 0x-?[0-9a-f]+>', gdb_repr)
self.assertTrue(m,
msg='Unexpected new-style class rendering %r' % gdb_repr)
def test_subclassing_tuple(self):
'Verify the pretty-printing of an instance of a tuple subclass'
# This should exercise the negative tp_dictoffset code in the
# new-style class support
gdb_repr, gdb_output = self.get_gdb_repr('''
class Foo(tuple):
pass
foo = Foo((1, 2, 3))
foo.an_int = 42
id(foo)''')
m = re.match(r'<Foo\(an_int=42\) at remote 0x-?[0-9a-f]+>', gdb_repr)
self.assertTrue(m,
msg='Unexpected new-style class rendering %r' % gdb_repr)
def assertSane(self, source, corruption, exprepr=None):
'''Run Python under gdb, corrupting variables in the inferior process
immediately before taking a backtrace.
Verify that the variable's representation is the expected failsafe
representation'''
if corruption:
cmds_after_breakpoint=[corruption, 'backtrace']
else:
cmds_after_breakpoint=['backtrace']
gdb_repr, gdb_output = \
self.get_gdb_repr(source,
cmds_after_breakpoint=cmds_after_breakpoint)
if exprepr:
if gdb_repr == exprepr:
# gdb managed to print the value in spite of the corruption;
# this is good (see http://bugs.python.org/issue8330)
return
# Match anything for the type name; 0xDEADBEEF could point to
# something arbitrary (see http://bugs.python.org/issue8330)
pattern = '<.* at remote 0x-?[0-9a-f]+>'
m = re.match(pattern, gdb_repr)
if not m:
self.fail('Unexpected gdb representation: %r\n%s' % \
(gdb_repr, gdb_output))
def test_NULL_ptr(self):
'Ensure that a NULL PyObject* is handled gracefully'
gdb_repr, gdb_output = (
self.get_gdb_repr('id(42)',
cmds_after_breakpoint=['set variable v=0',
'backtrace'])
)
self.assertEqual(gdb_repr, '0x0')
def test_NULL_ob_type(self):
'Ensure that a PyObject* with NULL ob_type is handled gracefully'
self.assertSane('id(42)',
'set v->ob_type=0')
def test_corrupt_ob_type(self):
'Ensure that a PyObject* with a corrupt ob_type is handled gracefully'
self.assertSane('id(42)',
'set v->ob_type=0xDEADBEEF',
exprepr='42')
def test_corrupt_tp_flags(self):
'Ensure that a PyObject* with a type with corrupt tp_flags is handled'
self.assertSane('id(42)',
'set v->ob_type->tp_flags=0x0',
exprepr='42')
def test_corrupt_tp_name(self):
'Ensure that a PyObject* with a type with corrupt tp_name is handled'
self.assertSane('id(42)',
'set v->ob_type->tp_name=0xDEADBEEF',
exprepr='42')
def test_builtins_help(self):
'Ensure that the new-style class _Helper in site.py can be handled'
if sys.flags.no_site:
self.skipTest("need site module, but -S option was used")
# (this was the issue causing tracebacks in
# http://bugs.python.org/issue8032#msg100537 )
gdb_repr, gdb_output = self.get_gdb_repr('id(__builtins__.help)', import_site=True)
m = re.match(r'<_Helper at remote 0x-?[0-9a-f]+>', gdb_repr)
self.assertTrue(m,
msg='Unexpected rendering %r' % gdb_repr)
def test_selfreferential_list(self):
'''Ensure that a reference loop involving a list doesn't lead proxyval
into an infinite loop:'''
gdb_repr, gdb_output = \
self.get_gdb_repr("a = [3, 4, 5] ; a.append(a) ; id(a)")
self.assertEqual(gdb_repr, '[3, 4, 5, [...]]')
gdb_repr, gdb_output = \
self.get_gdb_repr("a = [3, 4, 5] ; b = [a] ; a.append(b) ; id(a)")
self.assertEqual(gdb_repr, '[3, 4, 5, [[...]]]')
def test_selfreferential_dict(self):
'''Ensure that a reference loop involving a dict doesn't lead proxyval
into an infinite loop:'''
gdb_repr, gdb_output = \
self.get_gdb_repr("a = {} ; b = {'bar':a} ; a['foo'] = b ; id(a)")
self.assertEqual(gdb_repr, "{'foo': {'bar': {...}}}")
def test_selfreferential_old_style_instance(self):
gdb_repr, gdb_output = \
self.get_gdb_repr('''
class Foo:
pass
foo = Foo()
foo.an_attr = foo
id(foo)''')
self.assertTrue(re.match(r'<Foo\(an_attr=<\.\.\.>\) at remote 0x-?[0-9a-f]+>',
gdb_repr),
'Unexpected gdb representation: %r\n%s' % \
(gdb_repr, gdb_output))
def test_selfreferential_new_style_instance(self):
gdb_repr, gdb_output = \
self.get_gdb_repr('''
class Foo(object):
pass
foo = Foo()
foo.an_attr = foo
id(foo)''')
self.assertTrue(re.match(r'<Foo\(an_attr=<\.\.\.>\) at remote 0x-?[0-9a-f]+>',
gdb_repr),
'Unexpected gdb representation: %r\n%s' % \
(gdb_repr, gdb_output))
gdb_repr, gdb_output = \
self.get_gdb_repr('''
class Foo(object):
pass
a = Foo()
b = Foo()
a.an_attr = b
b.an_attr = a
id(a)''')
self.assertTrue(re.match(r'<Foo\(an_attr=<Foo\(an_attr=<\.\.\.>\) at remote 0x-?[0-9a-f]+>\) at remote 0x-?[0-9a-f]+>',
gdb_repr),
'Unexpected gdb representation: %r\n%s' % \
(gdb_repr, gdb_output))
def test_truncation(self):
'Verify that very long output is truncated'
gdb_repr, gdb_output = self.get_gdb_repr('id(list(range(1000)))')
self.assertEqual(gdb_repr,
"[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, "
"14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, "
"27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, "
"40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, "
"53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, "
"66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, "
"79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, "
"92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, "
"104, 105, 106, 107, 108, 109, 110, 111, 112, 113, "
"114, 115, 116, 117, 118, 119, 120, 121, 122, 123, "
"124, 125, 126, 127, 128, 129, 130, 131, 132, 133, "
"134, 135, 136, 137, 138, 139, 140, 141, 142, 143, "
"144, 145, 146, 147, 148, 149, 150, 151, 152, 153, "
"154, 155, 156, 157, 158, 159, 160, 161, 162, 163, "
"164, 165, 166, 167, 168, 169, 170, 171, 172, 173, "
"174, 175, 176, 177, 178, 179, 180, 181, 182, 183, "
"184, 185, 186, 187, 188, 189, 190, 191, 192, 193, "
"194, 195, 196, 197, 198, 199, 200, 201, 202, 203, "
"204, 205, 206, 207, 208, 209, 210, 211, 212, 213, "
"214, 215, 216, 217, 218, 219, 220, 221, 222, 223, "
"224, 225, 226...(truncated)")
self.assertEqual(len(gdb_repr),
1024 + len('...(truncated)'))
def test_builtin_method(self):
gdb_repr, gdb_output = self.get_gdb_repr('import sys; id(sys.stdout.readlines)')
self.assertTrue(re.match(r'<built-in method readlines of _io.TextIOWrapper object at remote 0x-?[0-9a-f]+>',
gdb_repr),
'Unexpected gdb representation: %r\n%s' % \
(gdb_repr, gdb_output))
def test_frames(self):
gdb_output = self.get_stack_trace('''
def foo(a, b, c):
pass
foo(3, 4, 5)
id(foo.__code__)''',
breakpoint='builtin_id',
cmds_after_breakpoint=['print (PyFrameObject*)(((PyCodeObject*)v)->co_zombieframe)']
)
self.assertTrue(re.match(r'.*\s+\$1 =\s+Frame 0x-?[0-9a-f]+, for file <string>, line 3, in foo \(\)\s+.*',
gdb_output,
re.DOTALL),
'Unexpected gdb representation: %r\n%s' % (gdb_output, gdb_output))
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
class PyListTests(DebuggerTests):
def assertListing(self, expected, actual):
self.assertEndsWith(actual, expected)
def test_basic_command(self):
'Verify that the "py-list" command works'
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-list'])
self.assertListing(' 5 \n'
' 6 def bar(a, b, c):\n'
' 7 baz(a, b, c)\n'
' 8 \n'
' 9 def baz(*args):\n'
' >10 id(42)\n'
' 11 \n'
' 12 foo(1, 2, 3)\n',
bt)
def test_one_abs_arg(self):
'Verify the "py-list" command with one absolute argument'
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-list 9'])
self.assertListing(' 9 def baz(*args):\n'
' >10 id(42)\n'
' 11 \n'
' 12 foo(1, 2, 3)\n',
bt)
def test_two_abs_args(self):
'Verify the "py-list" command with two absolute arguments'
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-list 1,3'])
self.assertListing(' 1 # Sample script for use by test_gdb.py\n'
' 2 \n'
' 3 def foo(a, b, c):\n',
bt)
class StackNavigationTests(DebuggerTests):
@unittest.skipUnless(HAS_PYUP_PYDOWN, "test requires py-up/py-down commands")
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_pyup_command(self):
'Verify that the "py-up" command works'
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-up', 'py-up'])
self.assertMultilineMatches(bt,
r'''^.*
#[0-9]+ Frame 0x-?[0-9a-f]+, for file .*gdb_sample.py, line 7, in bar \(a=1, b=2, c=3\)
baz\(a, b, c\)
$''')
@unittest.skipUnless(HAS_PYUP_PYDOWN, "test requires py-up/py-down commands")
def test_down_at_bottom(self):
'Verify handling of "py-down" at the bottom of the stack'
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-down'])
self.assertEndsWith(bt,
'Unable to find a newer python frame\n')
@unittest.skipUnless(HAS_PYUP_PYDOWN, "test requires py-up/py-down commands")
def test_up_at_top(self):
'Verify handling of "py-up" at the top of the stack'
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-up'] * 5)
self.assertEndsWith(bt,
'Unable to find an older python frame\n')
@unittest.skipUnless(HAS_PYUP_PYDOWN, "test requires py-up/py-down commands")
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_up_then_down(self):
'Verify "py-up" followed by "py-down"'
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-up', 'py-up', 'py-down'])
self.assertMultilineMatches(bt,
r'''^.*
#[0-9]+ Frame 0x-?[0-9a-f]+, for file .*gdb_sample.py, line 7, in bar \(a=1, b=2, c=3\)
baz\(a, b, c\)
#[0-9]+ Frame 0x-?[0-9a-f]+, for file .*gdb_sample.py, line 10, in baz \(args=\(1, 2, 3\)\)
id\(42\)
$''')
class PyBtTests(DebuggerTests):
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_bt(self):
'Verify that the "py-bt" command works'
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-bt'])
self.assertMultilineMatches(bt,
r'''^.*
Traceback \(most recent call first\):
<built-in method id of module object .*>
File ".*gdb_sample.py", line 10, in baz
id\(42\)
File ".*gdb_sample.py", line 7, in bar
baz\(a, b, c\)
File ".*gdb_sample.py", line 4, in foo
bar\(a, b, c\)
File ".*gdb_sample.py", line 12, in <module>
foo\(1, 2, 3\)
''')
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_bt_full(self):
'Verify that the "py-bt-full" command works'
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-bt-full'])
self.assertMultilineMatches(bt,
r'''^.*
#[0-9]+ Frame 0x-?[0-9a-f]+, for file .*gdb_sample.py, line 7, in bar \(a=1, b=2, c=3\)
baz\(a, b, c\)
#[0-9]+ Frame 0x-?[0-9a-f]+, for file .*gdb_sample.py, line 4, in foo \(a=1, b=2, c=3\)
bar\(a, b, c\)
#[0-9]+ Frame 0x-?[0-9a-f]+, for file .*gdb_sample.py, line 12, in <module> \(\)
foo\(1, 2, 3\)
''')
def test_threads(self):
'Verify that "py-bt" indicates threads that are waiting for the GIL'
cmd = '''
from threading import Thread
class TestThread(Thread):
# These threads would run forever, but we'll interrupt things with the
# debugger
def run(self):
i = 0
while 1:
i += 1
t = {}
for i in range(4):
t[i] = TestThread()
t[i].start()
# Trigger a breakpoint on the main thread
id(42)
'''
# Verify with "py-bt":
gdb_output = self.get_stack_trace(cmd,
cmds_after_breakpoint=['thread apply all py-bt'])
self.assertIn('Waiting for the GIL', gdb_output)
# Verify with "py-bt-full":
gdb_output = self.get_stack_trace(cmd,
cmds_after_breakpoint=['thread apply all py-bt-full'])
self.assertIn('Waiting for the GIL', gdb_output)
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
# Some older versions of gdb will fail with
# "Cannot find new threads: generic error"
# unless we add LD_PRELOAD=PATH-TO-libpthread.so.1 as a workaround
def test_gc(self):
'Verify that "py-bt" indicates if a thread is garbage-collecting'
cmd = ('from gc import collect\n'
'id(42)\n'
'def foo():\n'
' collect()\n'
'def bar():\n'
' foo()\n'
'bar()\n')
# Verify with "py-bt":
gdb_output = self.get_stack_trace(cmd,
cmds_after_breakpoint=['break update_refs', 'continue', 'py-bt'],
)
self.assertIn('Garbage-collecting', gdb_output)
# Verify with "py-bt-full":
gdb_output = self.get_stack_trace(cmd,
cmds_after_breakpoint=['break update_refs', 'continue', 'py-bt-full'],
)
self.assertIn('Garbage-collecting', gdb_output)
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
# Some older versions of gdb will fail with
# "Cannot find new threads: generic error"
# unless we add LD_PRELOAD=PATH-TO-libpthread.so.1 as a workaround
def test_pycfunction(self):
'Verify that "py-bt" displays invocations of PyCFunction instances'
# Various optimizations multiply the code paths by which these are
# called, so test a variety of calling conventions.
for py_name, py_args, c_name, expected_frame_number in (
('gmtime', '', 'time_gmtime', 1), # METH_VARARGS
('len', '[]', 'builtin_len', 1), # METH_O
('locals', '', 'builtin_locals', 1), # METH_NOARGS
('iter', '[]', 'builtin_iter', 1), # METH_FASTCALL
('sorted', '[]', 'builtin_sorted', 1), # METH_FASTCALL|METH_KEYWORDS
):
with self.subTest(c_name):
cmd = ('from time import gmtime\n' # (not always needed)
'def foo():\n'
f' {py_name}({py_args})\n'
'def bar():\n'
' foo()\n'
'bar()\n')
# Verify with "py-bt":
gdb_output = self.get_stack_trace(
cmd,
breakpoint=c_name,
cmds_after_breakpoint=['bt', 'py-bt'],
)
self.assertIn(f'<built-in method {py_name}', gdb_output)
# Verify with "py-bt-full":
gdb_output = self.get_stack_trace(
cmd,
breakpoint=c_name,
cmds_after_breakpoint=['py-bt-full'],
)
self.assertIn(
f'#{expected_frame_number} <built-in method {py_name}',
gdb_output,
)
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_wrapper_call(self):
cmd = textwrap.dedent('''
class MyList(list):
def __init__(self):
super().__init__() # wrapper_call()
id("first break point")
l = MyList()
''')
cmds_after_breakpoint = ['break wrapper_call', 'continue']
if CET_PROTECTION:
# bpo-32962: same case as in get_stack_trace():
# we need an additional 'next' command in order to read
# arguments of the innermost function of the call stack.
cmds_after_breakpoint.append('next')
cmds_after_breakpoint.append('py-bt')
# Verify with "py-bt":
gdb_output = self.get_stack_trace(cmd,
cmds_after_breakpoint=cmds_after_breakpoint)
self.assertRegex(gdb_output,
r"<method-wrapper u?'__init__' of MyList object at ")
class PyPrintTests(DebuggerTests):
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_basic_command(self):
'Verify that the "py-print" command works'
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-up', 'py-print args'])
self.assertMultilineMatches(bt,
r".*\nlocal 'args' = \(1, 2, 3\)\n.*")
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
@unittest.skipUnless(HAS_PYUP_PYDOWN, "test requires py-up/py-down commands")
def test_print_after_up(self):
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-up', 'py-up', 'py-print c', 'py-print b', 'py-print a'])
self.assertMultilineMatches(bt,
r".*\nlocal 'c' = 3\nlocal 'b' = 2\nlocal 'a' = 1\n.*")
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_printing_global(self):
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-up', 'py-print __name__'])
self.assertMultilineMatches(bt,
r".*\nglobal '__name__' = '__main__'\n.*")
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_printing_builtin(self):
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-up', 'py-print len'])
self.assertMultilineMatches(bt,
r".*\nbuiltin 'len' = <built-in method len of module object at remote 0x-?[0-9a-f]+>\n.*")
class PyLocalsTests(DebuggerTests):
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_basic_command(self):
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-up', 'py-locals'])
self.assertMultilineMatches(bt,
r".*\nargs = \(1, 2, 3\)\n.*")
@unittest.skipUnless(HAS_PYUP_PYDOWN, "test requires py-up/py-down commands")
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_locals_after_up(self):
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-up', 'py-up', 'py-locals'])
self.assertMultilineMatches(bt,
r".*\na = 1\nb = 2\nc = 3\n.*")
def test_main():
if support.verbose:
print("GDB version %s.%s:" % (gdb_major_version, gdb_minor_version))
for line in gdb_version.splitlines():
print(" " * 4 + line)
run_unittest(PrettyPrintTests,
PyListTests,
StackNavigationTests,
PyBtTests,
PyPrintTests,
PyLocalsTests
)
if __name__ == "__main__":
test_main()