forked from python/cpython
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathspecialize.c
2583 lines (2473 loc) · 90.4 KB
/
specialize.c
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
#include "Python.h"
#include "opcode.h"
#include "pycore_code.h"
#include "pycore_descrobject.h" // _PyMethodWrapper_Type
#include "pycore_dict.h" // DICT_KEYS_UNICODE
#include "pycore_function.h" // _PyFunction_GetVersionForCurrentState()
#include "pycore_long.h" // _PyLong_IsNonNegativeCompact()
#include "pycore_moduleobject.h"
#include "pycore_object.h"
#include "pycore_opcode_metadata.h" // _PyOpcode_Caches
#include "pycore_uop_metadata.h" // _PyOpcode_uop_name
#include "pycore_uop_ids.h" // MAX_UOP_ID
#include "pycore_opcode_utils.h" // RESUME_AT_FUNC_START
#include "pycore_pylifecycle.h" // _PyOS_URandomNonblock()
#include "pycore_runtime.h" // _Py_ID()
#include <stdlib.h> // rand()
extern const char *_PyUOpName(int index);
/* For guidance on adding or extending families of instructions see
* ./adaptive.md
*/
#ifdef Py_STATS
GCStats _py_gc_stats[NUM_GENERATIONS] = { 0 };
static PyStats _Py_stats_struct = { .gc_stats = _py_gc_stats };
PyStats *_Py_stats = NULL;
#define ADD_STAT_TO_DICT(res, field) \
do { \
PyObject *val = PyLong_FromUnsignedLongLong(stats->field); \
if (val == NULL) { \
Py_DECREF(res); \
return NULL; \
} \
if (PyDict_SetItemString(res, #field, val) == -1) { \
Py_DECREF(res); \
Py_DECREF(val); \
return NULL; \
} \
Py_DECREF(val); \
} while(0);
static PyObject*
stats_to_dict(SpecializationStats *stats)
{
PyObject *res = PyDict_New();
if (res == NULL) {
return NULL;
}
ADD_STAT_TO_DICT(res, success);
ADD_STAT_TO_DICT(res, failure);
ADD_STAT_TO_DICT(res, hit);
ADD_STAT_TO_DICT(res, deferred);
ADD_STAT_TO_DICT(res, miss);
ADD_STAT_TO_DICT(res, deopt);
PyObject *failure_kinds = PyTuple_New(SPECIALIZATION_FAILURE_KINDS);
if (failure_kinds == NULL) {
Py_DECREF(res);
return NULL;
}
for (int i = 0; i < SPECIALIZATION_FAILURE_KINDS; i++) {
PyObject *stat = PyLong_FromUnsignedLongLong(stats->failure_kinds[i]);
if (stat == NULL) {
Py_DECREF(res);
Py_DECREF(failure_kinds);
return NULL;
}
PyTuple_SET_ITEM(failure_kinds, i, stat);
}
if (PyDict_SetItemString(res, "failure_kinds", failure_kinds)) {
Py_DECREF(res);
Py_DECREF(failure_kinds);
return NULL;
}
Py_DECREF(failure_kinds);
return res;
}
#undef ADD_STAT_TO_DICT
static int
add_stat_dict(
PyObject *res,
int opcode,
const char *name) {
SpecializationStats *stats = &_Py_stats_struct.opcode_stats[opcode].specialization;
PyObject *d = stats_to_dict(stats);
if (d == NULL) {
return -1;
}
int err = PyDict_SetItemString(res, name, d);
Py_DECREF(d);
return err;
}
PyObject*
_Py_GetSpecializationStats(void) {
PyObject *stats = PyDict_New();
if (stats == NULL) {
return NULL;
}
int err = 0;
err += add_stat_dict(stats, CONTAINS_OP, "contains_op");
err += add_stat_dict(stats, LOAD_SUPER_ATTR, "load_super_attr");
err += add_stat_dict(stats, LOAD_ATTR, "load_attr");
err += add_stat_dict(stats, LOAD_GLOBAL, "load_global");
err += add_stat_dict(stats, BINARY_SUBSCR, "binary_subscr");
err += add_stat_dict(stats, STORE_SUBSCR, "store_subscr");
err += add_stat_dict(stats, STORE_ATTR, "store_attr");
err += add_stat_dict(stats, CALL, "call");
err += add_stat_dict(stats, BINARY_OP, "binary_op");
err += add_stat_dict(stats, COMPARE_OP, "compare_op");
err += add_stat_dict(stats, UNPACK_SEQUENCE, "unpack_sequence");
err += add_stat_dict(stats, FOR_ITER, "for_iter");
err += add_stat_dict(stats, TO_BOOL, "to_bool");
err += add_stat_dict(stats, SEND, "send");
if (err < 0) {
Py_DECREF(stats);
return NULL;
}
return stats;
}
#define PRINT_STAT(i, field) \
if (stats[i].field) { \
fprintf(out, " opcode[%s]." #field " : %" PRIu64 "\n", _PyOpcode_OpName[i], stats[i].field); \
}
static void
print_spec_stats(FILE *out, OpcodeStats *stats)
{
/* Mark some opcodes as specializable for stats,
* even though we don't specialize them yet. */
fprintf(out, "opcode[BINARY_SLICE].specializable : 1\n");
fprintf(out, "opcode[STORE_SLICE].specializable : 1\n");
for (int i = 0; i < 256; i++) {
if (_PyOpcode_Caches[i] && i != JUMP_BACKWARD) {
fprintf(out, "opcode[%s].specializable : 1\n", _PyOpcode_OpName[i]);
}
PRINT_STAT(i, specialization.success);
PRINT_STAT(i, specialization.failure);
PRINT_STAT(i, specialization.hit);
PRINT_STAT(i, specialization.deferred);
PRINT_STAT(i, specialization.miss);
PRINT_STAT(i, specialization.deopt);
PRINT_STAT(i, execution_count);
for (int j = 0; j < SPECIALIZATION_FAILURE_KINDS; j++) {
uint64_t val = stats[i].specialization.failure_kinds[j];
if (val) {
fprintf(out, " opcode[%s].specialization.failure_kinds[%d] : %"
PRIu64 "\n", _PyOpcode_OpName[i], j, val);
}
}
for (int j = 0; j < 256; j++) {
if (stats[i].pair_count[j]) {
fprintf(out, "opcode[%s].pair_count[%s] : %" PRIu64 "\n",
_PyOpcode_OpName[i], _PyOpcode_OpName[j], stats[i].pair_count[j]);
}
}
}
}
#undef PRINT_STAT
static void
print_call_stats(FILE *out, CallStats *stats)
{
fprintf(out, "Calls to PyEval_EvalDefault: %" PRIu64 "\n", stats->pyeval_calls);
fprintf(out, "Calls to Python functions inlined: %" PRIu64 "\n", stats->inlined_py_calls);
fprintf(out, "Frames pushed: %" PRIu64 "\n", stats->frames_pushed);
fprintf(out, "Frame objects created: %" PRIu64 "\n", stats->frame_objects_created);
for (int i = 0; i < EVAL_CALL_KINDS; i++) {
fprintf(out, "Calls via PyEval_EvalFrame[%d] : %" PRIu64 "\n", i, stats->eval_calls[i]);
}
}
static void
print_object_stats(FILE *out, ObjectStats *stats)
{
fprintf(out, "Object allocations from freelist: %" PRIu64 "\n", stats->from_freelist);
fprintf(out, "Object frees to freelist: %" PRIu64 "\n", stats->to_freelist);
fprintf(out, "Object allocations: %" PRIu64 "\n", stats->allocations);
fprintf(out, "Object allocations to 512 bytes: %" PRIu64 "\n", stats->allocations512);
fprintf(out, "Object allocations to 4 kbytes: %" PRIu64 "\n", stats->allocations4k);
fprintf(out, "Object allocations over 4 kbytes: %" PRIu64 "\n", stats->allocations_big);
fprintf(out, "Object frees: %" PRIu64 "\n", stats->frees);
fprintf(out, "Object inline values: %" PRIu64 "\n", stats->inline_values);
fprintf(out, "Object interpreter increfs: %" PRIu64 "\n", stats->interpreter_increfs);
fprintf(out, "Object interpreter decrefs: %" PRIu64 "\n", stats->interpreter_decrefs);
fprintf(out, "Object increfs: %" PRIu64 "\n", stats->increfs);
fprintf(out, "Object decrefs: %" PRIu64 "\n", stats->decrefs);
fprintf(out, "Object materialize dict (on request): %" PRIu64 "\n", stats->dict_materialized_on_request);
fprintf(out, "Object materialize dict (new key): %" PRIu64 "\n", stats->dict_materialized_new_key);
fprintf(out, "Object materialize dict (too big): %" PRIu64 "\n", stats->dict_materialized_too_big);
fprintf(out, "Object materialize dict (str subclass): %" PRIu64 "\n", stats->dict_materialized_str_subclass);
fprintf(out, "Object method cache hits: %" PRIu64 "\n", stats->type_cache_hits);
fprintf(out, "Object method cache misses: %" PRIu64 "\n", stats->type_cache_misses);
fprintf(out, "Object method cache collisions: %" PRIu64 "\n", stats->type_cache_collisions);
fprintf(out, "Object method cache dunder hits: %" PRIu64 "\n", stats->type_cache_dunder_hits);
fprintf(out, "Object method cache dunder misses: %" PRIu64 "\n", stats->type_cache_dunder_misses);
}
static void
print_gc_stats(FILE *out, GCStats *stats)
{
for (int i = 0; i < NUM_GENERATIONS; i++) {
fprintf(out, "GC[%d] collections: %" PRIu64 "\n", i, stats[i].collections);
fprintf(out, "GC[%d] object visits: %" PRIu64 "\n", i, stats[i].object_visits);
fprintf(out, "GC[%d] objects collected: %" PRIu64 "\n", i, stats[i].objects_collected);
}
}
#ifdef _Py_TIER2
static void
print_histogram(FILE *out, const char *name, uint64_t hist[_Py_UOP_HIST_SIZE])
{
for (int i = 0; i < _Py_UOP_HIST_SIZE; i++) {
fprintf(out, "%s[%" PRIu64"]: %" PRIu64 "\n", name, (uint64_t)1 << i, hist[i]);
}
}
static void
print_optimization_stats(FILE *out, OptimizationStats *stats)
{
fprintf(out, "Optimization attempts: %" PRIu64 "\n", stats->attempts);
fprintf(out, "Optimization traces created: %" PRIu64 "\n", stats->traces_created);
fprintf(out, "Optimization traces executed: %" PRIu64 "\n", stats->traces_executed);
fprintf(out, "Optimization uops executed: %" PRIu64 "\n", stats->uops_executed);
fprintf(out, "Optimization trace stack overflow: %" PRIu64 "\n", stats->trace_stack_overflow);
fprintf(out, "Optimization trace stack underflow: %" PRIu64 "\n", stats->trace_stack_underflow);
fprintf(out, "Optimization trace too long: %" PRIu64 "\n", stats->trace_too_long);
fprintf(out, "Optimization trace too short: %" PRIu64 "\n", stats->trace_too_short);
fprintf(out, "Optimization inner loop: %" PRIu64 "\n", stats->inner_loop);
fprintf(out, "Optimization recursive call: %" PRIu64 "\n", stats->recursive_call);
fprintf(out, "Optimization low confidence: %" PRIu64 "\n", stats->low_confidence);
fprintf(out, "Executors invalidated: %" PRIu64 "\n", stats->executors_invalidated);
print_histogram(out, "Trace length", stats->trace_length_hist);
print_histogram(out, "Trace run length", stats->trace_run_length_hist);
print_histogram(out, "Optimized trace length", stats->optimized_trace_length_hist);
fprintf(out, "Optimization optimizer attempts: %" PRIu64 "\n", stats->optimizer_attempts);
fprintf(out, "Optimization optimizer successes: %" PRIu64 "\n", stats->optimizer_successes);
fprintf(out, "Optimization optimizer failure no memory: %" PRIu64 "\n",
stats->optimizer_failure_reason_no_memory);
fprintf(out, "Optimizer remove globals builtins changed: %" PRIu64 "\n", stats->remove_globals_builtins_changed);
fprintf(out, "Optimizer remove globals incorrect keys: %" PRIu64 "\n", stats->remove_globals_incorrect_keys);
for (int i = 0; i <= MAX_UOP_ID; i++) {
if (stats->opcode[i].execution_count) {
fprintf(out, "uops[%s].execution_count : %" PRIu64 "\n", _PyUOpName(i), stats->opcode[i].execution_count);
}
if (stats->opcode[i].miss) {
fprintf(out, "uops[%s].specialization.miss : %" PRIu64 "\n", _PyUOpName(i), stats->opcode[i].miss);
}
}
for (int i = 0; i < 256; i++) {
if (stats->unsupported_opcode[i]) {
fprintf(
out,
"unsupported_opcode[%s].count : %" PRIu64 "\n",
_PyOpcode_OpName[i],
stats->unsupported_opcode[i]
);
}
}
for (int i = 1; i <= MAX_UOP_ID; i++){
for (int j = 1; j <= MAX_UOP_ID; j++) {
if (stats->opcode[i].pair_count[j]) {
fprintf(out, "uop[%s].pair_count[%s] : %" PRIu64 "\n",
_PyOpcode_uop_name[i], _PyOpcode_uop_name[j], stats->opcode[i].pair_count[j]);
}
}
}
for (int i = 0; i < MAX_UOP_ID; i++) {
if (stats->error_in_opcode[i]) {
fprintf(
out,
"error_in_opcode[%s].count : %" PRIu64 "\n",
_PyUOpName(i),
stats->error_in_opcode[i]
);
}
}
}
#endif
static void
print_rare_event_stats(FILE *out, RareEventStats *stats)
{
fprintf(out, "Rare event (set_class): %" PRIu64 "\n", stats->set_class);
fprintf(out, "Rare event (set_bases): %" PRIu64 "\n", stats->set_bases);
fprintf(out, "Rare event (set_eval_frame_func): %" PRIu64 "\n", stats->set_eval_frame_func);
fprintf(out, "Rare event (builtin_dict): %" PRIu64 "\n", stats->builtin_dict);
fprintf(out, "Rare event (func_modification): %" PRIu64 "\n", stats->func_modification);
fprintf(out, "Rare event (watched_dict_modification): %" PRIu64 "\n", stats->watched_dict_modification);
fprintf(out, "Rare event (watched_globals_modification): %" PRIu64 "\n", stats->watched_globals_modification);
}
static void
print_stats(FILE *out, PyStats *stats)
{
print_spec_stats(out, stats->opcode_stats);
print_call_stats(out, &stats->call_stats);
print_object_stats(out, &stats->object_stats);
print_gc_stats(out, stats->gc_stats);
#ifdef _Py_TIER2
print_optimization_stats(out, &stats->optimization_stats);
#endif
print_rare_event_stats(out, &stats->rare_event_stats);
}
void
_Py_StatsOn(void)
{
_Py_stats = &_Py_stats_struct;
}
void
_Py_StatsOff(void)
{
_Py_stats = NULL;
}
void
_Py_StatsClear(void)
{
memset(&_py_gc_stats, 0, sizeof(_py_gc_stats));
memset(&_Py_stats_struct, 0, sizeof(_Py_stats_struct));
_Py_stats_struct.gc_stats = _py_gc_stats;
}
static int
mem_is_zero(unsigned char *ptr, size_t size)
{
for (size_t i=0; i < size; i++) {
if (*ptr != 0) {
return 0;
}
ptr++;
}
return 1;
}
int
_Py_PrintSpecializationStats(int to_file)
{
PyStats *stats = &_Py_stats_struct;
#define MEM_IS_ZERO(DATA) mem_is_zero((unsigned char*)DATA, sizeof(*(DATA)))
int is_zero = (
MEM_IS_ZERO(stats->gc_stats) // is a pointer
&& MEM_IS_ZERO(&stats->opcode_stats)
&& MEM_IS_ZERO(&stats->call_stats)
&& MEM_IS_ZERO(&stats->object_stats)
);
#undef MEM_IS_ZERO
if (is_zero) {
// gh-108753: -X pystats command line was used, but then _stats_off()
// and _stats_clear() have been called: in this case, avoid printing
// useless "all zeros" statistics.
return 0;
}
FILE *out = stderr;
if (to_file) {
/* Write to a file instead of stderr. */
# ifdef MS_WINDOWS
const char *dirname = "c:\\temp\\py_stats\\";
# else
const char *dirname = "/tmp/py_stats/";
# endif
/* Use random 160 bit number as file name,
* to avoid both accidental collisions and
* symlink attacks. */
unsigned char rand[20];
char hex_name[41];
_PyOS_URandomNonblock(rand, 20);
for (int i = 0; i < 20; i++) {
hex_name[2*i] = Py_hexdigits[rand[i]&15];
hex_name[2*i+1] = Py_hexdigits[(rand[i]>>4)&15];
}
hex_name[40] = '\0';
char buf[64];
assert(strlen(dirname) + 40 + strlen(".txt") < 64);
sprintf(buf, "%s%s.txt", dirname, hex_name);
FILE *fout = fopen(buf, "w");
if (fout) {
out = fout;
}
}
else {
fprintf(out, "Specialization stats:\n");
}
print_stats(out, stats);
if (out != stderr) {
fclose(out);
}
return 1;
}
#define SPECIALIZATION_FAIL(opcode, kind) \
do { \
if (_Py_stats) { \
_Py_stats->opcode_stats[opcode].specialization.failure_kinds[kind]++; \
} \
} while (0)
#endif // Py_STATS
#ifndef SPECIALIZATION_FAIL
# define SPECIALIZATION_FAIL(opcode, kind) ((void)0)
#endif
// Initialize warmup counters and insert superinstructions. This cannot fail.
void
_PyCode_Quicken(PyCodeObject *code)
{
#if ENABLE_SPECIALIZATION
int opcode = 0;
_Py_CODEUNIT *instructions = _PyCode_CODE(code);
for (int i = 0; i < Py_SIZE(code); i++) {
opcode = _Py_GetBaseOpcode(code, i);
assert(opcode < MIN_INSTRUMENTED_OPCODE);
int caches = _PyOpcode_Caches[opcode];
if (caches) {
// The initial value depends on the opcode
switch (opcode) {
case JUMP_BACKWARD:
instructions[i + 1].counter = initial_jump_backoff_counter();
break;
case POP_JUMP_IF_FALSE:
case POP_JUMP_IF_TRUE:
case POP_JUMP_IF_NONE:
case POP_JUMP_IF_NOT_NONE:
instructions[i + 1].cache = 0x5555; // Alternating 0, 1 bits
break;
default:
instructions[i + 1].counter = adaptive_counter_warmup();
break;
}
i += caches;
}
}
#endif /* ENABLE_SPECIALIZATION */
}
#define SIMPLE_FUNCTION 0
/* Common */
#define SPEC_FAIL_OTHER 0
#define SPEC_FAIL_NO_DICT 1
#define SPEC_FAIL_OVERRIDDEN 2
#define SPEC_FAIL_OUT_OF_VERSIONS 3
#define SPEC_FAIL_OUT_OF_RANGE 4
#define SPEC_FAIL_EXPECTED_ERROR 5
#define SPEC_FAIL_WRONG_NUMBER_ARGUMENTS 6
#define SPEC_FAIL_CODE_COMPLEX_PARAMETERS 7
#define SPEC_FAIL_CODE_NOT_OPTIMIZED 8
#define SPEC_FAIL_LOAD_GLOBAL_NON_DICT 17
#define SPEC_FAIL_LOAD_GLOBAL_NON_STRING_OR_SPLIT 18
/* Super */
#define SPEC_FAIL_SUPER_BAD_CLASS 9
#define SPEC_FAIL_SUPER_SHADOWED 10
/* Attributes */
#define SPEC_FAIL_ATTR_OVERRIDING_DESCRIPTOR 9
#define SPEC_FAIL_ATTR_NON_OVERRIDING_DESCRIPTOR 10
#define SPEC_FAIL_ATTR_NOT_DESCRIPTOR 11
#define SPEC_FAIL_ATTR_METHOD 12
#define SPEC_FAIL_ATTR_MUTABLE_CLASS 13
#define SPEC_FAIL_ATTR_PROPERTY 14
#define SPEC_FAIL_ATTR_NON_OBJECT_SLOT 15
#define SPEC_FAIL_ATTR_READ_ONLY 16
#define SPEC_FAIL_ATTR_AUDITED_SLOT 17
#define SPEC_FAIL_ATTR_NOT_MANAGED_DICT 18
#define SPEC_FAIL_ATTR_NON_STRING_OR_SPLIT 19
#define SPEC_FAIL_ATTR_MODULE_ATTR_NOT_FOUND 20
#define SPEC_FAIL_ATTR_SHADOWED 21
#define SPEC_FAIL_ATTR_BUILTIN_CLASS_METHOD 22
#define SPEC_FAIL_ATTR_CLASS_METHOD_OBJ 23
#define SPEC_FAIL_ATTR_OBJECT_SLOT 24
#define SPEC_FAIL_ATTR_INSTANCE_ATTRIBUTE 26
#define SPEC_FAIL_ATTR_METACLASS_ATTRIBUTE 27
#define SPEC_FAIL_ATTR_PROPERTY_NOT_PY_FUNCTION 28
#define SPEC_FAIL_ATTR_NOT_IN_KEYS 29
#define SPEC_FAIL_ATTR_NOT_IN_DICT 30
#define SPEC_FAIL_ATTR_CLASS_ATTR_SIMPLE 31
#define SPEC_FAIL_ATTR_CLASS_ATTR_DESCRIPTOR 32
#define SPEC_FAIL_ATTR_BUILTIN_CLASS_METHOD_OBJ 33
/* Binary subscr and store subscr */
#define SPEC_FAIL_SUBSCR_ARRAY_INT 9
#define SPEC_FAIL_SUBSCR_ARRAY_SLICE 10
#define SPEC_FAIL_SUBSCR_LIST_SLICE 11
#define SPEC_FAIL_SUBSCR_TUPLE_SLICE 12
#define SPEC_FAIL_SUBSCR_STRING_SLICE 14
#define SPEC_FAIL_SUBSCR_BUFFER_INT 15
#define SPEC_FAIL_SUBSCR_BUFFER_SLICE 16
#define SPEC_FAIL_SUBSCR_SEQUENCE_INT 17
/* Store subscr */
#define SPEC_FAIL_SUBSCR_BYTEARRAY_INT 18
#define SPEC_FAIL_SUBSCR_BYTEARRAY_SLICE 19
#define SPEC_FAIL_SUBSCR_PY_SIMPLE 20
#define SPEC_FAIL_SUBSCR_PY_OTHER 21
#define SPEC_FAIL_SUBSCR_DICT_SUBCLASS_NO_OVERRIDE 22
#define SPEC_FAIL_SUBSCR_NOT_HEAP_TYPE 23
/* Binary op */
#define SPEC_FAIL_BINARY_OP_ADD_DIFFERENT_TYPES 9
#define SPEC_FAIL_BINARY_OP_ADD_OTHER 10
#define SPEC_FAIL_BINARY_OP_AND_DIFFERENT_TYPES 11
#define SPEC_FAIL_BINARY_OP_AND_INT 12
#define SPEC_FAIL_BINARY_OP_AND_OTHER 13
#define SPEC_FAIL_BINARY_OP_FLOOR_DIVIDE 14
#define SPEC_FAIL_BINARY_OP_LSHIFT 15
#define SPEC_FAIL_BINARY_OP_MATRIX_MULTIPLY 16
#define SPEC_FAIL_BINARY_OP_MULTIPLY_DIFFERENT_TYPES 17
#define SPEC_FAIL_BINARY_OP_MULTIPLY_OTHER 18
#define SPEC_FAIL_BINARY_OP_OR 19
#define SPEC_FAIL_BINARY_OP_POWER 20
#define SPEC_FAIL_BINARY_OP_REMAINDER 21
#define SPEC_FAIL_BINARY_OP_RSHIFT 22
#define SPEC_FAIL_BINARY_OP_SUBTRACT_DIFFERENT_TYPES 23
#define SPEC_FAIL_BINARY_OP_SUBTRACT_OTHER 24
#define SPEC_FAIL_BINARY_OP_TRUE_DIVIDE_DIFFERENT_TYPES 25
#define SPEC_FAIL_BINARY_OP_TRUE_DIVIDE_FLOAT 26
#define SPEC_FAIL_BINARY_OP_TRUE_DIVIDE_OTHER 27
#define SPEC_FAIL_BINARY_OP_XOR 28
/* Calls */
#define SPEC_FAIL_CALL_INSTANCE_METHOD 11
#define SPEC_FAIL_CALL_CMETHOD 12
#define SPEC_FAIL_CALL_CFUNC_VARARGS 13
#define SPEC_FAIL_CALL_CFUNC_VARARGS_KEYWORDS 14
#define SPEC_FAIL_CALL_CFUNC_NOARGS 15
#define SPEC_FAIL_CALL_CFUNC_METHOD_FASTCALL_KEYWORDS 16
#define SPEC_FAIL_CALL_METH_DESCR_VARARGS 17
#define SPEC_FAIL_CALL_METH_DESCR_VARARGS_KEYWORDS 18
#define SPEC_FAIL_CALL_METH_DESCR_METHOD_FASTCALL_KEYWORDS 19
#define SPEC_FAIL_CALL_BAD_CALL_FLAGS 20
#define SPEC_FAIL_CALL_INIT_NOT_PYTHON 21
#define SPEC_FAIL_CALL_PEP_523 22
#define SPEC_FAIL_CALL_BOUND_METHOD 23
#define SPEC_FAIL_CALL_STR 24
#define SPEC_FAIL_CALL_CLASS_NO_VECTORCALL 25
#define SPEC_FAIL_CALL_CLASS_MUTABLE 26
#define SPEC_FAIL_CALL_METHOD_WRAPPER 28
#define SPEC_FAIL_CALL_OPERATOR_WRAPPER 29
#define SPEC_FAIL_CALL_INIT_NOT_SIMPLE 30
#define SPEC_FAIL_CALL_METACLASS 31
#define SPEC_FAIL_CALL_INIT_NOT_INLINE_VALUES 32
/* COMPARE_OP */
#define SPEC_FAIL_COMPARE_OP_DIFFERENT_TYPES 12
#define SPEC_FAIL_COMPARE_OP_STRING 13
#define SPEC_FAIL_COMPARE_OP_BIG_INT 14
#define SPEC_FAIL_COMPARE_OP_BYTES 15
#define SPEC_FAIL_COMPARE_OP_TUPLE 16
#define SPEC_FAIL_COMPARE_OP_LIST 17
#define SPEC_FAIL_COMPARE_OP_SET 18
#define SPEC_FAIL_COMPARE_OP_BOOL 19
#define SPEC_FAIL_COMPARE_OP_BASEOBJECT 20
#define SPEC_FAIL_COMPARE_OP_FLOAT_LONG 21
#define SPEC_FAIL_COMPARE_OP_LONG_FLOAT 22
/* FOR_ITER and SEND */
#define SPEC_FAIL_ITER_GENERATOR 10
#define SPEC_FAIL_ITER_COROUTINE 11
#define SPEC_FAIL_ITER_ASYNC_GENERATOR 12
#define SPEC_FAIL_ITER_LIST 13
#define SPEC_FAIL_ITER_TUPLE 14
#define SPEC_FAIL_ITER_SET 15
#define SPEC_FAIL_ITER_STRING 16
#define SPEC_FAIL_ITER_BYTES 17
#define SPEC_FAIL_ITER_RANGE 18
#define SPEC_FAIL_ITER_ITERTOOLS 19
#define SPEC_FAIL_ITER_DICT_KEYS 20
#define SPEC_FAIL_ITER_DICT_ITEMS 21
#define SPEC_FAIL_ITER_DICT_VALUES 22
#define SPEC_FAIL_ITER_ENUMERATE 23
#define SPEC_FAIL_ITER_MAP 24
#define SPEC_FAIL_ITER_ZIP 25
#define SPEC_FAIL_ITER_SEQ_ITER 26
#define SPEC_FAIL_ITER_REVERSED_LIST 27
#define SPEC_FAIL_ITER_CALLABLE 28
#define SPEC_FAIL_ITER_ASCII_STRING 29
#define SPEC_FAIL_ITER_ASYNC_GENERATOR_SEND 30
// UNPACK_SEQUENCE
#define SPEC_FAIL_UNPACK_SEQUENCE_ITERATOR 9
#define SPEC_FAIL_UNPACK_SEQUENCE_SEQUENCE 10
// TO_BOOL
#define SPEC_FAIL_TO_BOOL_BYTEARRAY 9
#define SPEC_FAIL_TO_BOOL_BYTES 10
#define SPEC_FAIL_TO_BOOL_DICT 11
#define SPEC_FAIL_TO_BOOL_FLOAT 12
#define SPEC_FAIL_TO_BOOL_MAPPING 13
#define SPEC_FAIL_TO_BOOL_MEMORY_VIEW 14
#define SPEC_FAIL_TO_BOOL_NUMBER 15
#define SPEC_FAIL_TO_BOOL_SEQUENCE 16
#define SPEC_FAIL_TO_BOOL_SET 17
#define SPEC_FAIL_TO_BOOL_TUPLE 18
// CONTAINS_OP
#define SPEC_FAIL_CONTAINS_OP_STR 9
#define SPEC_FAIL_CONTAINS_OP_TUPLE 10
#define SPEC_FAIL_CONTAINS_OP_LIST 11
#define SPEC_FAIL_CONTAINS_OP_USER_CLASS 12
static int function_kind(PyCodeObject *code);
static bool function_check_args(PyObject *o, int expected_argcount, int opcode);
static uint32_t function_get_version(PyObject *o, int opcode);
static uint32_t type_get_version(PyTypeObject *t, int opcode);
static int
specialize_module_load_attr(
PyObject *owner, _Py_CODEUNIT *instr, PyObject *name
) {
_PyAttrCache *cache = (_PyAttrCache *)(instr + 1);
PyModuleObject *m = (PyModuleObject *)owner;
assert((owner->ob_type->tp_flags & Py_TPFLAGS_MANAGED_DICT) == 0);
PyDictObject *dict = (PyDictObject *)m->md_dict;
if (dict == NULL) {
SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_NO_DICT);
return -1;
}
if (dict->ma_keys->dk_kind != DICT_KEYS_UNICODE) {
SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_NON_STRING_OR_SPLIT);
return -1;
}
Py_ssize_t index = _PyDict_LookupIndex(dict, &_Py_ID(__getattr__));
assert(index != DKIX_ERROR);
if (index != DKIX_EMPTY) {
SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_MODULE_ATTR_NOT_FOUND);
return -1;
}
index = _PyDict_LookupIndex(dict, name);
assert (index != DKIX_ERROR);
if (index != (uint16_t)index) {
SPECIALIZATION_FAIL(LOAD_ATTR,
index == DKIX_EMPTY ?
SPEC_FAIL_ATTR_MODULE_ATTR_NOT_FOUND :
SPEC_FAIL_OUT_OF_RANGE);
return -1;
}
uint32_t keys_version = _PyDictKeys_GetVersionForCurrentState(
_PyInterpreterState_GET(), dict->ma_keys);
if (keys_version == 0) {
SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_OUT_OF_VERSIONS);
return -1;
}
write_u32(cache->version, keys_version);
cache->index = (uint16_t)index;
instr->op.code = LOAD_ATTR_MODULE;
return 0;
}
/* Attribute specialization */
void
_Py_Specialize_LoadSuperAttr(PyObject *global_super, PyObject *cls, _Py_CODEUNIT *instr, int load_method) {
assert(ENABLE_SPECIALIZATION);
assert(_PyOpcode_Caches[LOAD_SUPER_ATTR] == INLINE_CACHE_ENTRIES_LOAD_SUPER_ATTR);
_PySuperAttrCache *cache = (_PySuperAttrCache *)(instr + 1);
if (global_super != (PyObject *)&PySuper_Type) {
SPECIALIZATION_FAIL(LOAD_SUPER_ATTR, SPEC_FAIL_SUPER_SHADOWED);
goto fail;
}
if (!PyType_Check(cls)) {
SPECIALIZATION_FAIL(LOAD_SUPER_ATTR, SPEC_FAIL_SUPER_BAD_CLASS);
goto fail;
}
instr->op.code = load_method ? LOAD_SUPER_ATTR_METHOD : LOAD_SUPER_ATTR_ATTR;
goto success;
fail:
STAT_INC(LOAD_SUPER_ATTR, failure);
assert(!PyErr_Occurred());
instr->op.code = LOAD_SUPER_ATTR;
cache->counter = adaptive_counter_backoff(cache->counter);
return;
success:
STAT_INC(LOAD_SUPER_ATTR, success);
assert(!PyErr_Occurred());
cache->counter = adaptive_counter_cooldown();
}
typedef enum {
OVERRIDING, /* Is an overriding descriptor, and will remain so. */
METHOD, /* Attribute has Py_TPFLAGS_METHOD_DESCRIPTOR set */
PROPERTY, /* Is a property */
OBJECT_SLOT, /* Is an object slot descriptor */
OTHER_SLOT, /* Is a slot descriptor of another type */
NON_OVERRIDING, /* Is another non-overriding descriptor, and is an instance of an immutable class*/
BUILTIN_CLASSMETHOD, /* Builtin methods with METH_CLASS */
PYTHON_CLASSMETHOD, /* Python classmethod(func) object */
NON_DESCRIPTOR, /* Is not a descriptor, and is an instance of an immutable class */
MUTABLE, /* Instance of a mutable class; might, or might not, be a descriptor */
ABSENT, /* Attribute is not present on the class */
DUNDER_CLASS, /* __class__ attribute */
GETSET_OVERRIDDEN, /* __getattribute__ or __setattr__ has been overridden */
GETATTRIBUTE_IS_PYTHON_FUNCTION /* Descriptor requires calling a Python __getattribute__ */
} DescriptorClassification;
static DescriptorClassification
analyze_descriptor(PyTypeObject *type, PyObject *name, PyObject **descr, int store)
{
bool has_getattr = false;
if (store) {
if (type->tp_setattro != PyObject_GenericSetAttr) {
*descr = NULL;
return GETSET_OVERRIDDEN;
}
}
else {
getattrofunc getattro_slot = type->tp_getattro;
if (getattro_slot == PyObject_GenericGetAttr) {
/* Normal attribute lookup; */
has_getattr = false;
}
else if (getattro_slot == _Py_slot_tp_getattr_hook ||
getattro_slot == _Py_slot_tp_getattro) {
/* One or both of __getattribute__ or __getattr__ may have been
overridden See typeobject.c for why these functions are special. */
PyObject *getattribute = _PyType_Lookup(type,
&_Py_ID(__getattribute__));
PyInterpreterState *interp = _PyInterpreterState_GET();
bool has_custom_getattribute = getattribute != NULL &&
getattribute != interp->callable_cache.object__getattribute__;
has_getattr = _PyType_Lookup(type, &_Py_ID(__getattr__)) != NULL;
if (has_custom_getattribute) {
if (getattro_slot == _Py_slot_tp_getattro &&
!has_getattr &&
Py_IS_TYPE(getattribute, &PyFunction_Type)) {
*descr = getattribute;
return GETATTRIBUTE_IS_PYTHON_FUNCTION;
}
/* Potentially both __getattr__ and __getattribute__ are set.
Too complicated */
*descr = NULL;
return GETSET_OVERRIDDEN;
}
/* Potentially has __getattr__ but no custom __getattribute__.
Fall through to usual descriptor analysis.
Usual attribute lookup should only be allowed at runtime
if we can guarantee that there is no way an exception can be
raised. This means some specializations, e.g. specializing
for property() isn't safe.
*/
}
else {
*descr = NULL;
return GETSET_OVERRIDDEN;
}
}
PyObject *descriptor = _PyType_Lookup(type, name);
*descr = descriptor;
if (descriptor == NULL) {
return ABSENT;
}
PyTypeObject *desc_cls = Py_TYPE(descriptor);
if (!(desc_cls->tp_flags & Py_TPFLAGS_IMMUTABLETYPE)) {
return MUTABLE;
}
if (desc_cls->tp_descr_set) {
if (desc_cls == &PyMemberDescr_Type) {
PyMemberDescrObject *member = (PyMemberDescrObject *)descriptor;
struct PyMemberDef *dmem = member->d_member;
if (dmem->type == Py_T_OBJECT_EX || dmem->type == _Py_T_OBJECT) {
return OBJECT_SLOT;
}
return OTHER_SLOT;
}
if (desc_cls == &PyProperty_Type) {
/* We can't detect at runtime whether an attribute exists
with property. So that means we may have to call
__getattr__. */
return has_getattr ? GETSET_OVERRIDDEN : PROPERTY;
}
if (PyUnicode_CompareWithASCIIString(name, "__class__") == 0) {
if (descriptor == _PyType_Lookup(&PyBaseObject_Type, name)) {
return DUNDER_CLASS;
}
}
if (store) {
return OVERRIDING;
}
}
if (desc_cls->tp_descr_get) {
if (desc_cls->tp_flags & Py_TPFLAGS_METHOD_DESCRIPTOR) {
return METHOD;
}
if (Py_IS_TYPE(descriptor, &PyClassMethodDescr_Type)) {
return BUILTIN_CLASSMETHOD;
}
if (Py_IS_TYPE(descriptor, &PyClassMethod_Type)) {
return PYTHON_CLASSMETHOD;
}
return NON_OVERRIDING;
}
return NON_DESCRIPTOR;
}
static int
specialize_dict_access(
PyObject *owner, _Py_CODEUNIT *instr, PyTypeObject *type,
DescriptorClassification kind, PyObject *name,
int base_op, int values_op, int hint_op)
{
assert(kind == NON_OVERRIDING || kind == NON_DESCRIPTOR || kind == ABSENT ||
kind == BUILTIN_CLASSMETHOD || kind == PYTHON_CLASSMETHOD);
// No descriptor, or non overriding.
if ((type->tp_flags & Py_TPFLAGS_MANAGED_DICT) == 0) {
SPECIALIZATION_FAIL(base_op, SPEC_FAIL_ATTR_NOT_MANAGED_DICT);
return 0;
}
_PyAttrCache *cache = (_PyAttrCache *)(instr + 1);
if (type->tp_flags & Py_TPFLAGS_INLINE_VALUES && _PyObject_InlineValues(owner)->valid) {
PyDictKeysObject *keys = ((PyHeapTypeObject *)type)->ht_cached_keys;
assert(PyUnicode_CheckExact(name));
Py_ssize_t index = _PyDictKeys_StringLookup(keys, name);
assert (index != DKIX_ERROR);
if (index != (uint16_t)index) {
SPECIALIZATION_FAIL(base_op,
index == DKIX_EMPTY ?
SPEC_FAIL_ATTR_NOT_IN_KEYS :
SPEC_FAIL_OUT_OF_RANGE);
return 0;
}
write_u32(cache->version, type->tp_version_tag);
cache->index = (uint16_t)index;
instr->op.code = values_op;
}
else {
PyDictObject *dict = _PyObject_GetManagedDict(owner);
if (dict == NULL || !PyDict_CheckExact(dict)) {
SPECIALIZATION_FAIL(base_op, SPEC_FAIL_NO_DICT);
return 0;
}
// We found an instance with a __dict__.
if (dict->ma_values) {
SPECIALIZATION_FAIL(base_op, SPEC_FAIL_ATTR_NON_STRING_OR_SPLIT);
return 0;
}
Py_ssize_t index =
_PyDict_LookupIndex(dict, name);
if (index != (uint16_t)index) {
SPECIALIZATION_FAIL(base_op,
index == DKIX_EMPTY ?
SPEC_FAIL_ATTR_NOT_IN_DICT :
SPEC_FAIL_OUT_OF_RANGE);
return 0;
}
cache->index = (uint16_t)index;
write_u32(cache->version, type->tp_version_tag);
instr->op.code = hint_op;
}
return 1;
}
static int specialize_attr_loadclassattr(PyObject* owner, _Py_CODEUNIT* instr, PyObject* name,
PyObject* descr, DescriptorClassification kind, bool is_method);
static int specialize_class_load_attr(PyObject* owner, _Py_CODEUNIT* instr, PyObject* name);
void
_Py_Specialize_LoadAttr(PyObject *owner, _Py_CODEUNIT *instr, PyObject *name)
{
assert(ENABLE_SPECIALIZATION);
assert(_PyOpcode_Caches[LOAD_ATTR] == INLINE_CACHE_ENTRIES_LOAD_ATTR);
_PyAttrCache *cache = (_PyAttrCache *)(instr + 1);
PyTypeObject *type = Py_TYPE(owner);
if (!_PyType_IsReady(type)) {
// We *might* not really need this check, but we inherited it from
// PyObject_GenericGetAttr and friends... and this way we still do the
// right thing if someone forgets to call PyType_Ready(type):
SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_OTHER);
goto fail;
}
if (PyModule_CheckExact(owner)) {
if (specialize_module_load_attr(owner, instr, name))
{
goto fail;
}
goto success;
}
if (PyType_Check(owner)) {
if (specialize_class_load_attr(owner, instr, name)) {
goto fail;
}
goto success;
}
PyObject *descr = NULL;
DescriptorClassification kind = analyze_descriptor(type, name, &descr, 0);
assert(descr != NULL || kind == ABSENT || kind == GETSET_OVERRIDDEN);
if (type_get_version(type, LOAD_ATTR) == 0) {
goto fail;
}
switch(kind) {
case OVERRIDING:
SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_OVERRIDING_DESCRIPTOR);
goto fail;
case METHOD:
{
int oparg = instr->op.arg;
if (oparg & 1) {
if (specialize_attr_loadclassattr(owner, instr, name, descr, kind, true)) {
goto success;
}
}
else {
SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_METHOD);
}
goto fail;
}
case PROPERTY:
{
_PyLoadMethodCache *lm_cache = (_PyLoadMethodCache *)(instr + 1);
assert(Py_TYPE(descr) == &PyProperty_Type);
PyObject *fget = ((_PyPropertyObject *)descr)->prop_get;
if (fget == NULL) {
SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_EXPECTED_ERROR);
goto fail;
}
if (!Py_IS_TYPE(fget, &PyFunction_Type)) {
SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_PROPERTY_NOT_PY_FUNCTION);
goto fail;
}
if (!function_check_args(fget, 1, LOAD_ATTR)) {
goto fail;
}
if (instr->op.arg & 1) {
SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_METHOD);
goto fail;
}
uint32_t version = function_get_version(fget, LOAD_ATTR);
if (version == 0) {
goto fail;
}
if (_PyInterpreterState_GET()->eval_frame) {
SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_OTHER);
goto fail;
}
write_u32(lm_cache->keys_version, version);
assert(type->tp_version_tag != 0);
write_u32(lm_cache->type_version, type->tp_version_tag);
/* borrowed */
write_obj(lm_cache->descr, fget);
instr->op.code = LOAD_ATTR_PROPERTY;
goto success;
}
case OBJECT_SLOT:
{
PyMemberDescrObject *member = (PyMemberDescrObject *)descr;
struct PyMemberDef *dmem = member->d_member;
Py_ssize_t offset = dmem->offset;
if (!PyObject_TypeCheck(owner, member->d_common.d_type)) {
SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_EXPECTED_ERROR);
goto fail;
}
if (dmem->flags & Py_AUDIT_READ) {
SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_AUDITED_SLOT);
goto fail;
}
if (offset != (uint16_t)offset) {
SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_OUT_OF_RANGE);
goto fail;
}
assert(dmem->type == Py_T_OBJECT_EX || dmem->type == _Py_T_OBJECT);
assert(offset > 0);
cache->index = (uint16_t)offset;
write_u32(cache->version, type->tp_version_tag);
instr->op.code = LOAD_ATTR_SLOT;
goto success;
}
case DUNDER_CLASS:
{
Py_ssize_t offset = offsetof(PyObject, ob_type);
assert(offset == (uint16_t)offset);