- Notifications
You must be signed in to change notification settings - Fork 31.7k
/
Copy pathdis.py
1075 lines (938 loc) · 40 KB
/
dis.py
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
"""Disassembler of Python byte code into mnemonics."""
importsys
importtypes
importcollections
importio
fromopcodeimport*
fromopcodeimport (
__all__as_opcodes_all,
_cache_format,
_inline_cache_entries,
_nb_ops,
_intrinsic_1_descs,
_intrinsic_2_descs,
_specializations,
_specialized_opmap,
)
from_opcodeimportget_executor
__all__= ["code_info", "dis", "disassemble", "distb", "disco",
"findlinestarts", "findlabels", "show_code",
"get_instructions", "Instruction", "Bytecode"] +_opcodes_all
del_opcodes_all
_have_code= (types.MethodType, types.FunctionType, types.CodeType,
classmethod, staticmethod, type)
CONVERT_VALUE=opmap['CONVERT_VALUE']
SET_FUNCTION_ATTRIBUTE=opmap['SET_FUNCTION_ATTRIBUTE']
FUNCTION_ATTR_FLAGS= ('defaults', 'kwdefaults', 'annotations', 'closure')
ENTER_EXECUTOR=opmap['ENTER_EXECUTOR']
LOAD_CONST=opmap['LOAD_CONST']
RETURN_CONST=opmap['RETURN_CONST']
LOAD_GLOBAL=opmap['LOAD_GLOBAL']
BINARY_OP=opmap['BINARY_OP']
JUMP_BACKWARD=opmap['JUMP_BACKWARD']
FOR_ITER=opmap['FOR_ITER']
SEND=opmap['SEND']
LOAD_ATTR=opmap['LOAD_ATTR']
LOAD_SUPER_ATTR=opmap['LOAD_SUPER_ATTR']
CALL_INTRINSIC_1=opmap['CALL_INTRINSIC_1']
CALL_INTRINSIC_2=opmap['CALL_INTRINSIC_2']
LOAD_FAST_LOAD_FAST=opmap['LOAD_FAST_LOAD_FAST']
STORE_FAST_LOAD_FAST=opmap['STORE_FAST_LOAD_FAST']
STORE_FAST_STORE_FAST=opmap['STORE_FAST_STORE_FAST']
CACHE=opmap["CACHE"]
_all_opname=list(opname)
_all_opmap=dict(opmap)
forname, opin_specialized_opmap.items():
# fill opname and opmap
assertop<len(_all_opname)
_all_opname[op] =name
_all_opmap[name] =op
deoptmap= {
specialized: baseforbase, familyin_specializations.items() forspecializedinfamily
}
def_try_compile(source, name):
"""Attempts to compile the given source, first as an expression and
then as a statement if the first approach fails.
Utility function to accept strings in functions that otherwise
expect code objects
"""
try:
returncompile(source, name, 'eval')
exceptSyntaxError:
pass
returncompile(source, name, 'exec')
defdis(x=None, *, file=None, depth=None, show_caches=False, adaptive=False,
show_offsets=False):
"""Disassemble classes, methods, functions, and other compiled objects.
With no argument, disassemble the last traceback.
Compiled objects currently include generator objects, async generator
objects, and coroutine objects, all of which store their code object
in a special attribute.
"""
ifxisNone:
distb(file=file, show_caches=show_caches, adaptive=adaptive,
show_offsets=show_offsets)
return
# Extract functions from methods.
ifhasattr(x, '__func__'):
x=x.__func__
# Extract compiled code objects from...
ifhasattr(x, '__code__'): # ...a function, or
x=x.__code__
elifhasattr(x, 'gi_code'): #...a generator object, or
x=x.gi_code
elifhasattr(x, 'ag_code'): #...an asynchronous generator object, or
x=x.ag_code
elifhasattr(x, 'cr_code'): #...a coroutine.
x=x.cr_code
# Perform the disassembly.
ifhasattr(x, '__dict__'): # Class or module
items=sorted(x.__dict__.items())
forname, x1initems:
ifisinstance(x1, _have_code):
print("Disassembly of %s:"%name, file=file)
try:
dis(x1, file=file, depth=depth, show_caches=show_caches, adaptive=adaptive, show_offsets=show_offsets)
exceptTypeErrorasmsg:
print("Sorry:", msg, file=file)
print(file=file)
elifhasattr(x, 'co_code'): # Code object
_disassemble_recursive(x, file=file, depth=depth, show_caches=show_caches, adaptive=adaptive, show_offsets=show_offsets)
elifisinstance(x, (bytes, bytearray)): # Raw bytecode
labels_map=_make_labels_map(x)
label_width=4+len(str(len(labels_map)))
formatter=Formatter(file=file,
offset_width=len(str(max(len(x) -2, 9999))) ifshow_offsetselse0,
label_width=label_width,
show_caches=show_caches)
arg_resolver=ArgResolver(labels_map=labels_map)
_disassemble_bytes(x, arg_resolver=arg_resolver, formatter=formatter)
elifisinstance(x, str): # Source code
_disassemble_str(x, file=file, depth=depth, show_caches=show_caches, adaptive=adaptive, show_offsets=show_offsets)
else:
raiseTypeError("don't know how to disassemble %s objects"%
type(x).__name__)
defdistb(tb=None, *, file=None, show_caches=False, adaptive=False, show_offsets=False):
"""Disassemble a traceback (default: last traceback)."""
iftbisNone:
try:
ifhasattr(sys, 'last_exc'):
tb=sys.last_exc.__traceback__
else:
tb=sys.last_traceback
exceptAttributeError:
raiseRuntimeError("no last traceback to disassemble") fromNone
whiletb.tb_next: tb=tb.tb_next
disassemble(tb.tb_frame.f_code, tb.tb_lasti, file=file, show_caches=show_caches, adaptive=adaptive, show_offsets=show_offsets)
# The inspect module interrogates this dictionary to build its
# list of CO_* constants. It is also used by pretty_flags to
# turn the co_flags field into a human readable list.
COMPILER_FLAG_NAMES= {
1: "OPTIMIZED",
2: "NEWLOCALS",
4: "VARARGS",
8: "VARKEYWORDS",
16: "NESTED",
32: "GENERATOR",
64: "NOFREE",
128: "COROUTINE",
256: "ITERABLE_COROUTINE",
512: "ASYNC_GENERATOR",
}
defpretty_flags(flags):
"""Return pretty representation of code flags."""
names= []
foriinrange(32):
flag=1<<i
ifflags&flag:
names.append(COMPILER_FLAG_NAMES.get(flag, hex(flag)))
flags^=flag
ifnotflags:
break
else:
names.append(hex(flags))
return", ".join(names)
class_Unknown:
def__repr__(self):
return"<unknown>"
# Sentinel to represent values that cannot be calculated
UNKNOWN=_Unknown()
def_get_code_object(x):
"""Helper to handle methods, compiled or raw code objects, and strings."""
# Extract functions from methods.
ifhasattr(x, '__func__'):
x=x.__func__
# Extract compiled code objects from...
ifhasattr(x, '__code__'): # ...a function, or
x=x.__code__
elifhasattr(x, 'gi_code'): #...a generator object, or
x=x.gi_code
elifhasattr(x, 'ag_code'): #...an asynchronous generator object, or
x=x.ag_code
elifhasattr(x, 'cr_code'): #...a coroutine.
x=x.cr_code
# Handle source code.
ifisinstance(x, str):
x=_try_compile(x, "<disassembly>")
# By now, if we don't have a code object, we can't disassemble x.
ifhasattr(x, 'co_code'):
returnx
raiseTypeError("don't know how to disassemble %s objects"%
type(x).__name__)
def_deoptop(op):
name=_all_opname[op]
return_all_opmap[deoptmap[name]] ifnameindeoptmapelseop
def_get_code_array(co, adaptive):
ifadaptive:
code=co._co_code_adaptive
res= []
found=False
foriinrange(0, len(code), 2):
op, arg=code[i], code[i+1]
ifop==ENTER_EXECUTOR:
try:
ex=get_executor(co, i)
except (ValueError, RuntimeError):
ex=None
ifex:
op, arg=ex.get_opcode(), ex.get_oparg()
found=True
res.append(op.to_bytes())
res.append(arg.to_bytes())
returncodeifnotfoundelseb''.join(res)
else:
returnco.co_code
defcode_info(x):
"""Formatted details of methods, functions, or code."""
return_format_code_info(_get_code_object(x))
def_format_code_info(co):
lines= []
lines.append("Name: %s"%co.co_name)
lines.append("Filename: %s"%co.co_filename)
lines.append("Argument count: %s"%co.co_argcount)
lines.append("Positional-only arguments: %s"%co.co_posonlyargcount)
lines.append("Kw-only arguments: %s"%co.co_kwonlyargcount)
lines.append("Number of locals: %s"%co.co_nlocals)
lines.append("Stack size: %s"%co.co_stacksize)
lines.append("Flags: %s"%pretty_flags(co.co_flags))
ifco.co_consts:
lines.append("Constants:")
fori_cinenumerate(co.co_consts):
lines.append("%4d: %r"%i_c)
ifco.co_names:
lines.append("Names:")
fori_ninenumerate(co.co_names):
lines.append("%4d: %s"%i_n)
ifco.co_varnames:
lines.append("Variable names:")
fori_ninenumerate(co.co_varnames):
lines.append("%4d: %s"%i_n)
ifco.co_freevars:
lines.append("Free variables:")
fori_ninenumerate(co.co_freevars):
lines.append("%4d: %s"%i_n)
ifco.co_cellvars:
lines.append("Cell variables:")
fori_ninenumerate(co.co_cellvars):
lines.append("%4d: %s"%i_n)
return"\n".join(lines)
defshow_code(co, *, file=None):
"""Print details of methods, functions, or code to *file*.
If *file* is not provided, the output is printed on stdout.
"""
print(code_info(co), file=file)
Positions=collections.namedtuple(
'Positions',
[
'lineno',
'end_lineno',
'col_offset',
'end_col_offset',
],
defaults=[None] *4
)
_Instruction=collections.namedtuple(
"_Instruction",
[
'opname',
'opcode',
'arg',
'argval',
'argrepr',
'offset',
'start_offset',
'starts_line',
'line_number',
'label',
'positions',
'cache_info',
],
defaults=[None, None, None]
)
_Instruction.opname.__doc__="Human readable name for operation"
_Instruction.opcode.__doc__="Numeric code for operation"
_Instruction.arg.__doc__="Numeric argument to operation (if any), otherwise None"
_Instruction.argval.__doc__="Resolved arg value (if known), otherwise same as arg"
_Instruction.argrepr.__doc__="Human readable description of operation argument"
_Instruction.offset.__doc__="Start index of operation within bytecode sequence"
_Instruction.start_offset.__doc__= (
"Start index of operation within bytecode sequence, including extended args if present; "
"otherwise equal to Instruction.offset"
)
_Instruction.starts_line.__doc__="True if this opcode starts a source line, otherwise False"
_Instruction.line_number.__doc__="source line number associated with this opcode (if any), otherwise None"
_Instruction.label.__doc__="A label (int > 0) if this instruction is a jump target, otherwise None"
_Instruction.positions.__doc__="dis.Positions object holding the span of source code covered by this instruction"
_Instruction.cache_info.__doc__="list of (name, size, data), one for each cache entry of the instruction"
_ExceptionTableEntryBase=collections.namedtuple("_ExceptionTableEntryBase",
"start end target depth lasti")
class_ExceptionTableEntry(_ExceptionTableEntryBase):
pass
_OPNAME_WIDTH=20
_OPARG_WIDTH=5
def_get_cache_size(opname):
return_inline_cache_entries.get(opname, 0)
def_get_jump_target(op, arg, offset):
"""Gets the bytecode offset of the jump target if this is a jump instruction.
Otherwise return None.
"""
deop=_deoptop(op)
caches=_get_cache_size(_all_opname[deop])
ifdeopinhasjrel:
if_is_backward_jump(deop):
arg=-arg
target=offset+2+arg*2
target+=2*caches
elifdeopinhasjabs:
target=arg*2
else:
target=None
returntarget
classInstruction(_Instruction):
"""Details for a bytecode operation.
Defined fields:
opname - human readable name for operation
opcode - numeric code for operation
arg - numeric argument to operation (if any), otherwise None
argval - resolved arg value (if known), otherwise same as arg
argrepr - human readable description of operation argument
offset - start index of operation within bytecode sequence
start_offset - start index of operation within bytecode sequence including extended args if present;
otherwise equal to Instruction.offset
starts_line - True if this opcode starts a source line, otherwise False
line_number - source line number associated with this opcode (if any), otherwise None
label - A label if this instruction is a jump target, otherwise None
positions - Optional dis.Positions object holding the span of source code
covered by this instruction
cache_info - information about the format and content of the instruction's cache
entries (if any)
"""
@property
defoparg(self):
"""Alias for Instruction.arg."""
returnself.arg
@property
defbaseopcode(self):
"""Numeric code for the base operation if operation is specialized.
Otherwise equal to Instruction.opcode.
"""
return_deoptop(self.opcode)
@property
defbaseopname(self):
"""Human readable name for the base operation if operation is specialized.
Otherwise equal to Instruction.opname.
"""
returnopname[self.baseopcode]
@property
defcache_offset(self):
"""Start index of the cache entries following the operation."""
returnself.offset+2
@property
defend_offset(self):
"""End index of the cache entries following the operation."""
returnself.cache_offset+_get_cache_size(_all_opname[self.opcode])*2
@property
defjump_target(self):
"""Bytecode index of the jump target if this is a jump operation.
Otherwise return None.
"""
return_get_jump_target(self.opcode, self.arg, self.offset)
@property
defis_jump_target(self):
"""True if other code jumps to here, otherwise False"""
returnself.labelisnotNone
def__str__(self):
output=io.StringIO()
formatter=Formatter(file=output)
formatter.print_instruction(self, False)
returnoutput.getvalue()
classFormatter:
def__init__(self, file=None, lineno_width=0, offset_width=0, label_width=0,
line_offset=0, show_caches=False):
"""Create a Formatter
*file* where to write the output
*lineno_width* sets the width of the line number field (0 omits it)
*offset_width* sets the width of the instruction offset field
*label_width* sets the width of the label field
*show_caches* is a boolean indicating whether to display cache lines
"""
self.file=file
self.lineno_width=lineno_width
self.offset_width=offset_width
self.label_width=label_width
self.show_caches=show_caches
defprint_instruction(self, instr, mark_as_current=False):
self.print_instruction_line(instr, mark_as_current)
ifself.show_cachesandinstr.cache_info:
offset=instr.offset
forname, size, dataininstr.cache_info:
foriinrange(size):
offset+=2
# Only show the fancy argrepr for a CACHE instruction when it's
# the first entry for a particular cache value:
ifi==0:
argrepr=f"{name}: {int.from_bytes(data, sys.byteorder)}"
else:
argrepr=""
self.print_instruction_line(
Instruction("CACHE", CACHE, 0, None, argrepr, offset, offset,
False, None, None, instr.positions),
False)
defprint_instruction_line(self, instr, mark_as_current):
"""Format instruction details for inclusion in disassembly output."""
lineno_width=self.lineno_width
offset_width=self.offset_width
label_width=self.label_width
new_source_line= (lineno_width>0and
instr.starts_lineand
instr.offset>0)
ifnew_source_line:
print(file=self.file)
fields= []
# Column: Source code line number
iflineno_width:
ifinstr.starts_line:
lineno_fmt="%%%dd"ifinstr.line_numberisnotNoneelse"%%%ds"
lineno_fmt=lineno_fmt%lineno_width
lineno=_NO_LINENOifinstr.line_numberisNoneelseinstr.line_number
fields.append(lineno_fmt%lineno)
else:
fields.append(' '*lineno_width)
# Column: Label
ifinstr.labelisnotNone:
lbl=f"L{instr.label}:"
fields.append(f"{lbl:>{label_width}}")
else:
fields.append(' '*label_width)
# Column: Instruction offset from start of code sequence
ifoffset_width>0:
fields.append(f"{repr(instr.offset):>{offset_width}} ")
# Column: Current instruction indicator
ifmark_as_current:
fields.append('-->')
else:
fields.append(' ')
# Column: Opcode name
fields.append(instr.opname.ljust(_OPNAME_WIDTH))
# Column: Opcode argument
ifinstr.argisnotNone:
arg=repr(instr.arg)
# If opname is longer than _OPNAME_WIDTH, we allow it to overflow into
# the space reserved for oparg. This results in fewer misaligned opargs
# in the disassembly output.
opname_excess=max(0, len(instr.opname) -_OPNAME_WIDTH)
fields.append(repr(instr.arg).rjust(_OPARG_WIDTH-opname_excess))
# Column: Opcode argument details
ifinstr.argrepr:
fields.append('('+instr.argrepr+')')
print(' '.join(fields).rstrip(), file=self.file)
defprint_exception_table(self, exception_entries):
file=self.file
ifexception_entries:
print("ExceptionTable:", file=file)
forentryinexception_entries:
lasti=" lasti"ifentry.lastielse""
start=entry.start_label
end=entry.end_label
target=entry.target_label
print(f" L{start} to L{end} -> L{target} [{entry.depth}]{lasti}", file=file)
classArgResolver:
def__init__(self, co_consts=None, names=None, varname_from_oparg=None, labels_map=None):
self.co_consts=co_consts
self.names=names
self.varname_from_oparg=varname_from_oparg
self.labels_map=labels_mapor {}
defoffset_from_jump_arg(self, op, arg, offset):
deop=_deoptop(op)
ifdeopinhasjabs:
returnarg*2
elifdeopinhasjrel:
signed_arg=-argif_is_backward_jump(deop) elsearg
argval=offset+2+signed_arg*2
caches=_get_cache_size(_all_opname[deop])
argval+=2*caches
returnargval
returnNone
defget_label_for_offset(self, offset):
returnself.labels_map.get(offset, None)
defget_argval_argrepr(self, op, arg, offset):
get_name=Noneifself.namesisNoneelseself.names.__getitem__
argval=None
argrepr=''
deop=_deoptop(op)
ifargisnotNone:
# Set argval to the dereferenced value of the argument when
# available, and argrepr to the string representation of argval.
# _disassemble_bytes needs the string repr of the
# raw name index for LOAD_GLOBAL, LOAD_CONST, etc.
argval=arg
ifdeopinhasconst:
argval, argrepr=_get_const_info(deop, arg, self.co_consts)
elifdeopinhasname:
ifdeop==LOAD_GLOBAL:
argval, argrepr=_get_name_info(arg//2, get_name)
if (arg&1) andargrepr:
argrepr=f"{argrepr} + NULL"
elifdeop==LOAD_ATTR:
argval, argrepr=_get_name_info(arg//2, get_name)
if (arg&1) andargrepr:
argrepr=f"{argrepr} + NULL|self"
elifdeop==LOAD_SUPER_ATTR:
argval, argrepr=_get_name_info(arg//4, get_name)
if (arg&1) andargrepr:
argrepr=f"{argrepr} + NULL|self"
else:
argval, argrepr=_get_name_info(arg, get_name)
elifdeopinhasjumpordeopinhasexc:
argval=self.offset_from_jump_arg(op, arg, offset)
lbl=self.get_label_for_offset(argval)
assertlblisnotNone
argrepr=f"to L{lbl}"
elifdeopin (LOAD_FAST_LOAD_FAST, STORE_FAST_LOAD_FAST, STORE_FAST_STORE_FAST):
arg1=arg>>4
arg2=arg&15
val1, argrepr1=_get_name_info(arg1, self.varname_from_oparg)
val2, argrepr2=_get_name_info(arg2, self.varname_from_oparg)
argrepr=argrepr1+", "+argrepr2
argval=val1, val2
elifdeopinhaslocalordeopinhasfree:
argval, argrepr=_get_name_info(arg, self.varname_from_oparg)
elifdeopinhascompare:
argval=cmp_op[arg>>5]
argrepr=argval
ifarg&16:
argrepr=f"bool({argrepr})"
elifdeop==CONVERT_VALUE:
argval= (None, str, repr, ascii)[arg]
argrepr= ('', 'str', 'repr', 'ascii')[arg]
elifdeop==SET_FUNCTION_ATTRIBUTE:
argrepr=', '.join(sfori, sinenumerate(FUNCTION_ATTR_FLAGS)
ifarg& (1<<i))
elifdeop==BINARY_OP:
_, argrepr=_nb_ops[arg]
elifdeop==CALL_INTRINSIC_1:
argrepr=_intrinsic_1_descs[arg]
elifdeop==CALL_INTRINSIC_2:
argrepr=_intrinsic_2_descs[arg]
returnargval, argrepr
defget_instructions(x, *, first_line=None, show_caches=None, adaptive=False):
"""Iterator for the opcodes in methods, functions or code
Generates a series of Instruction named tuples giving the details of
each operations in the supplied code.
If *first_line* is not None, it indicates the line number that should
be reported for the first source line in the disassembled code.
Otherwise, the source line information (if any) is taken directly from
the disassembled code object.
"""
co=_get_code_object(x)
linestarts=dict(findlinestarts(co))
iffirst_lineisnotNone:
line_offset=first_line-co.co_firstlineno
else:
line_offset=0
original_code=co.co_code
arg_resolver=ArgResolver(co_consts=co.co_consts,
names=co.co_names,
varname_from_oparg=co._varname_from_oparg,
labels_map=_make_labels_map(original_code))
return_get_instructions_bytes(_get_code_array(co, adaptive),
linestarts=linestarts,
line_offset=line_offset,
co_positions=co.co_positions(),
original_code=original_code,
arg_resolver=arg_resolver)
def_get_const_value(op, arg, co_consts):
"""Helper to get the value of the const in a hasconst op.
Returns the dereferenced constant if this is possible.
Otherwise (if it is a LOAD_CONST and co_consts is not
provided) returns the dis.UNKNOWN sentinel.
"""
assertopinhasconst
argval=UNKNOWN
ifco_constsisnotNone:
argval=co_consts[arg]
returnargval
def_get_const_info(op, arg, co_consts):
"""Helper to get optional details about const references
Returns the dereferenced constant and its repr if the value
can be calculated.
Otherwise returns the sentinel value dis.UNKNOWN for the value
and an empty string for its repr.
"""
argval=_get_const_value(op, arg, co_consts)
argrepr=repr(argval) ifargvalisnotUNKNOWNelse''
returnargval, argrepr
def_get_name_info(name_index, get_name, **extrainfo):
"""Helper to get optional details about named references
Returns the dereferenced name as both value and repr if the name
list is defined.
Otherwise returns the sentinel value dis.UNKNOWN for the value
and an empty string for its repr.
"""
ifget_nameisnotNone:
argval=get_name(name_index, **extrainfo)
returnargval, argval
else:
returnUNKNOWN, ''
def_parse_varint(iterator):
b=next(iterator)
val=b&63
whileb&64:
val<<=6
b=next(iterator)
val|=b&63
returnval
def_parse_exception_table(code):
iterator=iter(code.co_exceptiontable)
entries= []
try:
whileTrue:
start=_parse_varint(iterator)*2
length=_parse_varint(iterator)*2
end=start+length
target=_parse_varint(iterator)*2
dl=_parse_varint(iterator)
depth=dl>>1
lasti=bool(dl&1)
entries.append(_ExceptionTableEntry(start, end, target, depth, lasti))
exceptStopIteration:
returnentries
def_is_backward_jump(op):
returnopname[op] in ('JUMP_BACKWARD',
'JUMP_BACKWARD_NO_INTERRUPT')
def_get_instructions_bytes(code, linestarts=None, line_offset=0, co_positions=None,
original_code=None, arg_resolver=None):
"""Iterate over the instructions in a bytecode string.
Generates a sequence of Instruction namedtuples giving the details of each
opcode.
"""
# Use the basic, unadaptive code for finding labels and actually walking the
# bytecode, since replacements like ENTER_EXECUTOR and INSTRUMENTED_* can
# mess that logic up pretty badly:
original_code=original_codeorcode
co_positions=co_positionsoriter(())
starts_line=False
local_line_number=None
line_number=None
foroffset, start_offset, op, argin_unpack_opargs(original_code):
iflinestartsisnotNone:
starts_line=offsetinlinestarts
ifstarts_line:
local_line_number=linestarts[offset]
iflocal_line_numberisnotNone:
line_number=local_line_number+line_offset
else:
line_number=None
positions=Positions(*next(co_positions, ()))
deop=_deoptop(op)
op=code[offset]
ifarg_resolver:
argval, argrepr=arg_resolver.get_argval_argrepr(op, arg, offset)
else:
argval, argrepr=arg, repr(arg)
caches=_get_cache_size(_all_opname[deop])
# Advance the co_positions iterator:
for_inrange(caches):
next(co_positions, ())
ifcaches:
cache_info= []
forname, sizein_cache_format[opname[deop]].items():
data=code[offset+2: offset+2+2*size]
cache_info.append((name, size, data))
else:
cache_info=None
label=arg_resolver.get_label_for_offset(offset) ifarg_resolverelseNone
yieldInstruction(_all_opname[op], op, arg, argval, argrepr,
offset, start_offset, starts_line, line_number,
label, positions, cache_info)
defdisassemble(co, lasti=-1, *, file=None, show_caches=False, adaptive=False,
show_offsets=False):
"""Disassemble a code object."""
linestarts=dict(findlinestarts(co))
exception_entries=_parse_exception_table(co)
labels_map=_make_labels_map(co.co_code, exception_entries=exception_entries)
label_width=4+len(str(len(labels_map)))
formatter=Formatter(file=file,
lineno_width=_get_lineno_width(linestarts),
offset_width=len(str(max(len(co.co_code) -2, 9999))) ifshow_offsetselse0,
label_width=label_width,
show_caches=show_caches)
arg_resolver=ArgResolver(co_consts=co.co_consts,
names=co.co_names,
varname_from_oparg=co._varname_from_oparg,
labels_map=labels_map)
_disassemble_bytes(_get_code_array(co, adaptive), lasti, linestarts,
exception_entries=exception_entries, co_positions=co.co_positions(),
original_code=co.co_code, arg_resolver=arg_resolver, formatter=formatter)
def_disassemble_recursive(co, *, file=None, depth=None, show_caches=False, adaptive=False, show_offsets=False):
disassemble(co, file=file, show_caches=show_caches, adaptive=adaptive, show_offsets=show_offsets)
ifdepthisNoneordepth>0:
ifdepthisnotNone:
depth=depth-1
forxinco.co_consts:
ifhasattr(x, 'co_code'):
print(file=file)
print("Disassembly of %r:"% (x,), file=file)
_disassemble_recursive(
x, file=file, depth=depth, show_caches=show_caches,
adaptive=adaptive, show_offsets=show_offsets
)
def_make_labels_map(original_code, exception_entries=()):
jump_targets=set(findlabels(original_code))
labels=set(jump_targets)
forstart, end, target, _, _inexception_entries:
labels.add(start)
labels.add(end)
labels.add(target)
labels=sorted(labels)
labels_map= {offset: i+1for (i, offset) inenumerate(sorted(labels))}
foreinexception_entries:
e.start_label=labels_map[e.start]
e.end_label=labels_map[e.end]
e.target_label=labels_map[e.target]
returnlabels_map
_NO_LINENO=' --'
def_get_lineno_width(linestarts):
iflinestartsisNone:
return0
maxlineno=max(filter(None, linestarts.values()), default=-1)
ifmaxlineno==-1:
# Omit the line number column entirely if we have no line number info
return0
lineno_width=max(3, len(str(maxlineno)))
iflineno_width<len(_NO_LINENO) andNoneinlinestarts.values():
lineno_width=len(_NO_LINENO)
returnlineno_width
def_disassemble_bytes(code, lasti=-1, linestarts=None,
*, line_offset=0, exception_entries=(),
co_positions=None, original_code=None,
arg_resolver=None, formatter=None):
assertformatterisnotNone
assertarg_resolverisnotNone
instrs=_get_instructions_bytes(code, linestarts=linestarts,
line_offset=line_offset,
co_positions=co_positions,
original_code=original_code,
arg_resolver=arg_resolver)
print_instructions(instrs, exception_entries, formatter, lasti=lasti)
defprint_instructions(instrs, exception_entries, formatter, lasti=-1):
forinstrininstrs:
# Each CACHE takes 2 bytes
is_current_instr=instr.offset<=lasti \
<=instr.offset+2*_get_cache_size(_all_opname[_deoptop(instr.opcode)])
formatter.print_instruction(instr, is_current_instr)
formatter.print_exception_table(exception_entries)
def_disassemble_str(source, **kwargs):
"""Compile the source string, then disassemble the code object."""
_disassemble_recursive(_try_compile(source, '<dis>'), **kwargs)
disco=disassemble# XXX For backwards compatibility
# Rely on C `int` being 32 bits for oparg
_INT_BITS=32
# Value for c int when it overflows
_INT_OVERFLOW=2** (_INT_BITS-1)
def_unpack_opargs(code):
extended_arg=0
extended_args_offset=0# Number of EXTENDED_ARG instructions preceding the current instruction
caches=0
foriinrange(0, len(code), 2):
# Skip inline CACHE entries:
ifcaches:
caches-=1
continue
op=code[i]
deop=_deoptop(op)
caches=_get_cache_size(_all_opname[deop])
ifdeopinhasarg:
arg=code[i+1] |extended_arg
extended_arg= (arg<<8) ifdeop==EXTENDED_ARGelse0
# The oparg is stored as a signed integer
# If the value exceeds its upper limit, it will overflow and wrap
# to a negative integer
ifextended_arg>=_INT_OVERFLOW:
extended_arg-=2*_INT_OVERFLOW
else:
arg=None
extended_arg=0
ifdeop==EXTENDED_ARG:
extended_args_offset+=1
yield (i, i, op, arg)
else:
start_offset=i-extended_args_offset*2
yield (i, start_offset, op, arg)
extended_args_offset=0
deffindlabels(code):
"""Detect all offsets in a byte code which are jump targets.
Return the list of offsets.
"""
labels= []
foroffset, _, op, argin_unpack_opargs(code):
ifargisnotNone:
label=_get_jump_target(op, arg, offset)
iflabelisNone:
continue
iflabelnotinlabels:
labels.append(label)
returnlabels
deffindlinestarts(code):
"""Find the offsets in a byte code which are start of lines in the source.
Generate pairs (offset, lineno)
lineno will be an integer or None the offset does not have a source line.
"""
lastline=False# None is a valid line number
forstart, end, lineincode.co_lines():
iflineisnotlastline:
lastline=line
yieldstart, line
return
def_find_imports(co):
"""Find import statements in the code
Generate triplets (name, level, fromlist) where
name is the imported module and level, fromlist are
the corresponding args to __import__.
"""
IMPORT_NAME=opmap['IMPORT_NAME']
consts=co.co_consts
names=co.co_names
opargs= [(op, arg) for_, _, op, argin_unpack_opargs(co.co_code)
ifop!=EXTENDED_ARG]
fori, (op, oparg) inenumerate(opargs):
ifop==IMPORT_NAMEandi>=2:
from_op=opargs[i-1]
level_op=opargs[i-2]
if (from_op[0] inhasconstandlevel_op[0] inhasconst):
level=_get_const_value(level_op[0], level_op[1], consts)
fromlist=_get_const_value(from_op[0], from_op[1], consts)
yield (names[oparg], level, fromlist)
def_find_store_names(co):
"""Find names of variables which are written in the code
Generate sequence of strings
"""
STORE_OPS= {
opmap['STORE_NAME'],
opmap['STORE_GLOBAL']
}
names=co.co_names
for_, _, op, argin_unpack_opargs(co.co_code):
ifopinSTORE_OPS:
yieldnames[arg]
classBytecode:
"""The bytecode operations of a piece of code
Instantiate this with a function, method, other compiled object, string of
code, or a code object (as returned by compile()).
Iterating over this yields the bytecode operations as Instruction instances.
"""
def__init__(self, x, *, first_line=None, current_offset=None, show_caches=False, adaptive=False, show_offsets=False):
self.codeobj=co=_get_code_object(x)
iffirst_lineisNone:
self.first_line=co.co_firstlineno
self._line_offset=0
else:
self.first_line=first_line
self._line_offset=first_line-co.co_firstlineno
self._linestarts=dict(findlinestarts(co))
self._original_object=x
self.current_offset=current_offset
self.exception_entries=_parse_exception_table(co)
self.show_caches=show_caches
self.adaptive=adaptive
self.show_offsets=show_offsets
def__iter__(self):
co=self.codeobj
original_code=co.co_code
labels_map=_make_labels_map(original_code, self.exception_entries)
arg_resolver=ArgResolver(co_consts=co.co_consts,
names=co.co_names,
varname_from_oparg=co._varname_from_oparg,
labels_map=labels_map)
return_get_instructions_bytes(_get_code_array(co, self.adaptive),
linestarts=self._linestarts,
line_offset=self._line_offset,
co_positions=co.co_positions(),
original_code=original_code,
arg_resolver=arg_resolver)
def__repr__(self):
