Repository navigation
Expand file tree
/
Copy pathceval.c
More file actions
2751 lines (2513 loc) · 82.8 KB
/
Copy pathceval.c
File metadata and controls
2751 lines (2513 loc) · 82.8 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
/* Execute compiled code */
#define _PY_INTERPRETER
#include "Python.h"
#include "pycore_abstract.h" // _PyIndex_Check()
#include "pycore_call.h" // _PyObject_CallNoArgs()
#include "pycore_ceval.h" // _PyEval_SignalAsyncExc()
#include "pycore_code.h"
#include "pycore_emscripten_signal.h" // _Py_CHECK_EMSCRIPTEN_SIGNALS
#include "pycore_function.h"
#include "pycore_instruments.h"
#include "pycore_intrinsics.h"
#include "pycore_long.h" // _PyLong_GetZero()
#include "pycore_moduleobject.h" // PyModuleObject
#include "pycore_object.h" // _PyObject_GC_TRACK()
#include "pycore_opcode_metadata.h" // EXTRA_CASES
#include "pycore_opcode_utils.h" // MAKE_FUNCTION_*
#include "pycore_pyerrors.h" // _PyErr_GetRaisedException()
#include "pycore_pystate.h" // _PyInterpreterState_GET()
#include "pycore_range.h" // _PyRangeIterObject
#include "pycore_setobject.h" // _PySet_Update()
#include "pycore_sliceobject.h" // _PyBuildSlice_ConsumeRefs
#include "pycore_sysmodule.h" // _PySys_Audit()
#include "pycore_tuple.h" // _PyTuple_ITEMS()
#include "pycore_typeobject.h" // _PySuper_Lookup()
#include "pycore_uops.h" // _PyUOpExecutorObject
#include "pycore_pyerrors.h"
#include "pycore_dict.h"
#include "dictobject.h"
#include "pycore_frame.h"
#include "frameobject.h" // _PyInterpreterFrame_GetLine
#include "opcode.h"
#include "pydtrace.h"
#include "setobject.h"
#include <stdbool.h> // bool
#ifdef Py_DEBUG
/* For debugging the interpreter: */
# define LLTRACE 1 /* Low-level trace feature */
#endif
#if !defined(Py_BUILD_CORE)
# error "ceval.c must be build with Py_BUILD_CORE define for best performance"
#endif
#if !defined(Py_DEBUG) && !defined(Py_TRACE_REFS)
// GH-89279: The MSVC compiler does not inline these static inline functions
// in PGO build in _PyEval_EvalFrameDefault(), because this function is over
// the limit of PGO, and that limit cannot be configured.
// Define them as macros to make sure that they are always inlined by the
// preprocessor.
#undef Py_DECREF
#define Py_DECREF(arg) \
do { \
PyObject *op = _PyObject_CAST(arg); \
if (_Py_IsImmortal(op)) { \
break; \
} \
_Py_DECREF_STAT_INC(); \
if (--op->ob_refcnt == 0) { \
destructor dealloc = Py_TYPE(op)->tp_dealloc; \
(*dealloc)(op); \
} \
} while (0)
#undef Py_XDECREF
#define Py_XDECREF(arg) \
do { \
PyObject *xop = _PyObject_CAST(arg); \
if (xop != NULL) { \
Py_DECREF(xop); \
} \
} while (0)
#undef Py_IS_TYPE
#define Py_IS_TYPE(ob, type) \
(_PyObject_CAST(ob)->ob_type == (type))
#undef _Py_DECREF_SPECIALIZED
#define _Py_DECREF_SPECIALIZED(arg, dealloc) \
do { \
PyObject *op = _PyObject_CAST(arg); \
if (_Py_IsImmortal(op)) { \
break; \
} \
_Py_DECREF_STAT_INC(); \
if (--op->ob_refcnt == 0) { \
destructor d = (destructor)(dealloc); \
d(op); \
} \
} while (0)
#endif
#ifdef LLTRACE
static void
dump_stack(_PyInterpreterFrame *frame, PyObject **stack_pointer)
{
PyObject **stack_base = _PyFrame_Stackbase(frame);
PyObject *exc = PyErr_GetRaisedException();
printf(" stack=[");
for (PyObject **ptr = stack_base; ptr < stack_pointer; ptr++) {
if (ptr != stack_base) {
printf(", ");
}
if (*ptr == NULL) {
printf("<nil>");
continue;
}
if (
*ptr == Py_None
|| PyBool_Check(*ptr)
|| PyLong_CheckExact(*ptr)
|| PyFloat_CheckExact(*ptr)
|| PyUnicode_CheckExact(*ptr)
) {
if (PyObject_Print(*ptr, stdout, 0) == 0) {
continue;
}
PyErr_Clear();
}
// Don't call __repr__(), it might recurse into the interpreter.
printf("<%s at %p>", Py_TYPE(*ptr)->tp_name, (void *)(*ptr));
}
printf("]\n");
fflush(stdout);
PyErr_SetRaisedException(exc);
}
static void
lltrace_instruction(_PyInterpreterFrame *frame,
PyObject **stack_pointer,
_Py_CODEUNIT *next_instr)
{
if (frame->owner == FRAME_OWNED_BY_CSTACK) {
return;
}
dump_stack(frame, stack_pointer);
int oparg = next_instr->op.arg;
int opcode = next_instr->op.code;
const char *opname = _PyOpcode_OpName[opcode];
assert(opname != NULL);
int offset = (int)(next_instr - _PyCode_CODE(_PyFrame_GetCode(frame)));
if (OPCODE_HAS_ARG((int)_PyOpcode_Deopt[opcode])) {
printf("%d: %s %d\n", offset * 2, opname, oparg);
}
else {
printf("%d: %s\n", offset * 2, opname);
}
fflush(stdout);
}
static void
lltrace_resume_frame(_PyInterpreterFrame *frame)
{
PyObject *fobj = frame->f_funcobj;
if (!PyCode_Check(frame->f_executable) ||
fobj == NULL ||
!PyFunction_Check(fobj)
) {
printf("\nResuming frame.\n");
return;
}
PyFunctionObject *f = (PyFunctionObject *)fobj;
PyObject *exc = PyErr_GetRaisedException();
PyObject *name = f->func_qualname;
if (name == NULL) {
name = f->func_name;
}
printf("\nResuming frame");
if (name) {
printf(" for ");
if (PyObject_Print(name, stdout, 0) < 0) {
PyErr_Clear();
}
}
if (f->func_module) {
printf(" in module ");
if (PyObject_Print(f->func_module, stdout, 0) < 0) {
PyErr_Clear();
}
}
printf("\n");
fflush(stdout);
PyErr_SetRaisedException(exc);
}
static int
maybe_lltrace_resume_frame(_PyInterpreterFrame *frame, _PyInterpreterFrame *skip_frame, PyObject *globals)
{
if (globals == NULL) {
return 0;
}
if (frame == skip_frame) {
return 0;
}
int r = PyDict_Contains(globals, &_Py_ID(__lltrace__));
if (r < 0) {
return -1;
}
int lltrace = r;
if (!lltrace) {
// When tracing executed uops, also trace bytecode
char *uop_debug = Py_GETENV("PYTHONUOPSDEBUG");
if (uop_debug != NULL && *uop_debug >= '0') {
lltrace = (*uop_debug - '0') >= 5; // TODO: Parse an int and all that
}
}
if (lltrace) {
lltrace_resume_frame(frame);
}
return lltrace;
}
#endif
static void monitor_raise(PyThreadState *tstate,
_PyInterpreterFrame *frame,
_Py_CODEUNIT *instr);
static void monitor_reraise(PyThreadState *tstate,
_PyInterpreterFrame *frame,
_Py_CODEUNIT *instr);
static int monitor_stop_iteration(PyThreadState *tstate,
_PyInterpreterFrame *frame,
_Py_CODEUNIT *instr);
static void monitor_unwind(PyThreadState *tstate,
_PyInterpreterFrame *frame,
_Py_CODEUNIT *instr);
static int monitor_handled(PyThreadState *tstate,
_PyInterpreterFrame *frame,
_Py_CODEUNIT *instr, PyObject *exc);
static void monitor_throw(PyThreadState *tstate,
_PyInterpreterFrame *frame,
_Py_CODEUNIT *instr);
static PyObject * import_name(PyThreadState *, _PyInterpreterFrame *,
PyObject *, PyObject *, PyObject *);
static PyObject * import_from(PyThreadState *, PyObject *, PyObject *);
static int check_args_iterable(PyThreadState *, PyObject *func, PyObject *vararg);
static int get_exception_handler(PyCodeObject *, int, int*, int*, int*);
static _PyInterpreterFrame *
_PyEvalFramePushAndInit(PyThreadState *tstate, PyFunctionObject *func,
PyObject *locals, PyObject* const* args,
size_t argcount, PyObject *kwnames);
static _PyInterpreterFrame *
_PyEvalFramePushAndInit_Ex(PyThreadState *tstate, PyFunctionObject *func,
PyObject *locals, Py_ssize_t nargs, PyObject *callargs, PyObject *kwargs);
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
int
Py_GetRecursionLimit(void)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
return interp->ceval.recursion_limit;
}
void
Py_SetRecursionLimit(int new_limit)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
interp->ceval.recursion_limit = new_limit;
for (PyThreadState *p = interp->threads.head; p != NULL; p = p->next) {
int depth = p->py_recursion_limit - p->py_recursion_remaining;
p->py_recursion_limit = new_limit;
p->py_recursion_remaining = new_limit - depth;
}
}
/* The function _Py_EnterRecursiveCallTstate() only calls _Py_CheckRecursiveCall()
if the recursion_depth reaches recursion_limit. */
int
_Py_CheckRecursiveCall(PyThreadState *tstate, const char *where)
{
#ifdef USE_STACKCHECK
if (PyOS_CheckStack()) {
++tstate->c_recursion_remaining;
_PyErr_SetString(tstate, PyExc_MemoryError, "Stack overflow");
return -1;
}
#endif
if (tstate->recursion_headroom) {
if (tstate->c_recursion_remaining < -50) {
/* Overflowing while handling an overflow. Give up. */
Py_FatalError("Cannot recover from stack overflow.");
}
}
else {
if (tstate->c_recursion_remaining <= 0) {
tstate->recursion_headroom++;
_PyErr_Format(tstate, PyExc_RecursionError,
"maximum recursion depth exceeded%s",
where);
tstate->recursion_headroom--;
++tstate->c_recursion_remaining;
return -1;
}
}
return 0;
}
const binaryfunc _PyEval_BinaryOps[] = {
[NB_ADD] = PyNumber_Add,
[NB_AND] = PyNumber_And,
[NB_FLOOR_DIVIDE] = PyNumber_FloorDivide,
[NB_LSHIFT] = PyNumber_Lshift,
[NB_MATRIX_MULTIPLY] = PyNumber_MatrixMultiply,
[NB_MULTIPLY] = PyNumber_Multiply,
[NB_REMAINDER] = PyNumber_Remainder,
[NB_OR] = PyNumber_Or,
[NB_POWER] = _PyNumber_PowerNoMod,
[NB_RSHIFT] = PyNumber_Rshift,
[NB_SUBTRACT] = PyNumber_Subtract,
[NB_TRUE_DIVIDE] = PyNumber_TrueDivide,
[NB_XOR] = PyNumber_Xor,
[NB_INPLACE_ADD] = PyNumber_InPlaceAdd,
[NB_INPLACE_AND] = PyNumber_InPlaceAnd,
[NB_INPLACE_FLOOR_DIVIDE] = PyNumber_InPlaceFloorDivide,
[NB_INPLACE_LSHIFT] = PyNumber_InPlaceLshift,
[NB_INPLACE_MATRIX_MULTIPLY] = PyNumber_InPlaceMatrixMultiply,
[NB_INPLACE_MULTIPLY] = PyNumber_InPlaceMultiply,
[NB_INPLACE_REMAINDER] = PyNumber_InPlaceRemainder,
[NB_INPLACE_OR] = PyNumber_InPlaceOr,
[NB_INPLACE_POWER] = _PyNumber_InPlacePowerNoMod,
[NB_INPLACE_RSHIFT] = PyNumber_InPlaceRshift,
[NB_INPLACE_SUBTRACT] = PyNumber_InPlaceSubtract,
[NB_INPLACE_TRUE_DIVIDE] = PyNumber_InPlaceTrueDivide,
[NB_INPLACE_XOR] = PyNumber_InPlaceXor,
};
// PEP 634: Structural Pattern Matching
// Return a tuple of values corresponding to keys, with error checks for
// duplicate/missing keys.
PyObject *
_PyEval_MatchKeys(PyThreadState *tstate, PyObject *map, PyObject *keys)
{
assert(PyTuple_CheckExact(keys));
Py_ssize_t nkeys = PyTuple_GET_SIZE(keys);
if (!nkeys) {
// No keys means no items.
return PyTuple_New(0);
}
PyObject *seen = NULL;
PyObject *dummy = NULL;
PyObject *values = NULL;
PyObject *get = NULL;
// We use the two argument form of map.get(key, default) for two reasons:
// - Atomically check for a key and get its value without error handling.
// - Don't cause key creation or resizing in dict subclasses like
// collections.defaultdict that define __missing__ (or similar).
int meth_found = _PyObject_GetMethod(map, &_Py_ID(get), &get);
if (get == NULL) {
goto fail;
}
seen = PySet_New(NULL);
if (seen == NULL) {
goto fail;
}
// dummy = object()
dummy = _PyObject_CallNoArgs((PyObject *)&PyBaseObject_Type);
if (dummy == NULL) {
goto fail;
}
values = PyTuple_New(nkeys);
if (values == NULL) {
goto fail;
}
for (Py_ssize_t i = 0; i < nkeys; i++) {
PyObject *key = PyTuple_GET_ITEM(keys, i);
if (PySet_Contains(seen, key) || PySet_Add(seen, key)) {
if (!_PyErr_Occurred(tstate)) {
// Seen it before!
_PyErr_Format(tstate, PyExc_ValueError,
"mapping pattern checks duplicate key (%R)", key);
}
goto fail;
}
PyObject *args[] = { map, key, dummy };
PyObject *value = NULL;
if (meth_found) {
value = PyObject_Vectorcall(get, args, 3, NULL);
}
else {
value = PyObject_Vectorcall(get, &args[1], 2, NULL);
}
if (value == NULL) {
goto fail;
}
if (value == dummy) {
// key not in map!
Py_DECREF(value);
Py_DECREF(values);
// Return None:
values = Py_NewRef(Py_None);
goto done;
}
PyTuple_SET_ITEM(values, i, value);
}
// Success:
done:
Py_DECREF(get);
Py_DECREF(seen);
Py_DECREF(dummy);
return values;
fail:
Py_XDECREF(get);
Py_XDECREF(seen);
Py_XDECREF(dummy);
Py_XDECREF(values);
return NULL;
}
// Extract a named attribute from the subject, with additional bookkeeping to
// raise TypeErrors for repeated lookups. On failure, return NULL (with no
// error set). Use _PyErr_Occurred(tstate) to disambiguate.
static PyObject *
match_class_attr(PyThreadState *tstate, PyObject *subject, PyObject *type,
PyObject *name, PyObject *seen)
{
assert(PyUnicode_CheckExact(name));
assert(PySet_CheckExact(seen));
if (PySet_Contains(seen, name) || PySet_Add(seen, name)) {
if (!_PyErr_Occurred(tstate)) {
// Seen it before!
_PyErr_Format(tstate, PyExc_TypeError,
"%s() got multiple sub-patterns for attribute %R",
((PyTypeObject*)type)->tp_name, name);
}
return NULL;
}
PyObject *attr;
(void)PyObject_GetOptionalAttr(subject, name, &attr);
return attr;
}
// On success (match), return a tuple of extracted attributes. On failure (no
// match), return NULL. Use _PyErr_Occurred(tstate) to disambiguate.
PyObject*
_PyEval_MatchClass(PyThreadState *tstate, PyObject *subject, PyObject *type,
Py_ssize_t nargs, PyObject *kwargs)
{
if (!PyType_Check(type)) {
const char *e = "called match pattern must be a class";
_PyErr_Format(tstate, PyExc_TypeError, e);
return NULL;
}
assert(PyTuple_CheckExact(kwargs));
// First, an isinstance check:
if (PyObject_IsInstance(subject, type) <= 0) {
return NULL;
}
// So far so good:
PyObject *seen = PySet_New(NULL);
if (seen == NULL) {
return NULL;
}
PyObject *attrs = PyList_New(0);
if (attrs == NULL) {
Py_DECREF(seen);
return NULL;
}
// NOTE: From this point on, goto fail on failure:
PyObject *match_args = NULL;
// First, the positional subpatterns:
if (nargs) {
int match_self = 0;
if (PyObject_GetOptionalAttr(type, &_Py_ID(__match_args__), &match_args) < 0) {
goto fail;
}
if (match_args) {
if (!PyTuple_CheckExact(match_args)) {
const char *e = "%s.__match_args__ must be a tuple (got %s)";
_PyErr_Format(tstate, PyExc_TypeError, e,
((PyTypeObject *)type)->tp_name,
Py_TYPE(match_args)->tp_name);
goto fail;
}
}
else {
// _Py_TPFLAGS_MATCH_SELF is only acknowledged if the type does not
// define __match_args__. This is natural behavior for subclasses:
// it's as if __match_args__ is some "magic" value that is lost as
// soon as they redefine it.
match_args = PyTuple_New(0);
match_self = PyType_HasFeature((PyTypeObject*)type,
_Py_TPFLAGS_MATCH_SELF);
}
assert(PyTuple_CheckExact(match_args));
Py_ssize_t allowed = match_self ? 1 : PyTuple_GET_SIZE(match_args);
if (allowed < nargs) {
const char *plural = (allowed == 1) ? "" : "s";
_PyErr_Format(tstate, PyExc_TypeError,
"%s() accepts %d positional sub-pattern%s (%d given)",
((PyTypeObject*)type)->tp_name,
allowed, plural, nargs);
goto fail;
}
if (match_self) {
// Easy. Copy the subject itself, and move on to kwargs.
if (PyList_Append(attrs, subject) < 0) {
goto fail;
}
}
else {
for (Py_ssize_t i = 0; i < nargs; i++) {
PyObject *name = PyTuple_GET_ITEM(match_args, i);
if (!PyUnicode_CheckExact(name)) {
_PyErr_Format(tstate, PyExc_TypeError,
"__match_args__ elements must be strings "
10BC8
"(got %s)", Py_TYPE(name)->tp_name);
goto fail;
}
PyObject *attr = match_class_attr(tstate, subject, type, name,
seen);
if (attr == NULL) {
goto fail;
}
if (PyList_Append(attrs, attr) < 0) {
Py_DECREF(attr);
goto fail;
}
Py_DECREF(attr);
}
}
Py_CLEAR(match_args);
}
// Finally, the keyword subpatterns:
for (Py_ssize_t i = 0; i < PyTuple_GET_SIZE(kwargs); i++) {
PyObject *name = PyTuple_GET_ITEM(kwargs, i);
PyObject *attr = match_class_attr(tstate, subject, type, name, seen);
if (attr == NULL) {
goto fail;
}
if (PyList_Append(attrs, attr) < 0) {
Py_DECREF(attr);
goto fail;
}
Py_DECREF(attr);
}
Py_SETREF(attrs, PyList_AsTuple(attrs));
Py_DECREF(seen);
return attrs;
fail:
// We really don't care whether an error was raised or not... that's our
// caller's problem. All we know is that the match failed.
Py_XDECREF(match_args);
Py_DECREF(seen);
Py_DECREF(attrs);
return NULL;
}
static int do_raise(PyThreadState *tstate, PyObject *exc, PyObject *cause);
PyObject *
PyEval_EvalCode(PyObject *co, PyObject *globals, PyObject *locals)
{
PyThreadState *tstate = _PyThreadState_GET();
if (locals == NULL) {
locals = globals;
}
PyObject *builtins = _PyEval_BuiltinsFromGlobals(tstate, globals); // borrowed ref
if (builtins == NULL) {
return NULL;
}
PyFrameConstructor desc = {
.fc_globals = globals,
.fc_builtins = builtins,
.fc_name = ((PyCodeObject *)co)->co_name,
.fc_qualname = ((PyCodeObject *)co)->co_name,
.fc_code = co,
.fc_defaults = NULL,
.fc_kwdefaults = NULL,
.fc_closure = NULL
};
PyFunctionObject *func = _PyFunction_FromConstructor(&desc);
if (func == NULL) {
return NULL;
}
EVAL_CALL_STAT_INC(EVAL_CALL_LEGACY);
PyObject *res = _PyEval_Vector(tstate, func, locals, NULL, 0, NULL);
Py_DECREF(func);
return res;
}
/* Interpreter main loop */
PyObject *
PyEval_EvalFrame(PyFrameObject *f)
{
/* Function kept for backward compatibility */
PyThreadState *tstate = _PyThreadState_GET();
return _PyEval_EvalFrame(tstate, f->f_frame, 0);
}
PyObject *
PyEval_EvalFrameEx(PyFrameObject *f, int throwflag)
{
PyThreadState *tstate = _PyThreadState_GET();
return _PyEval_EvalFrame(tstate, f->f_frame, throwflag);
}
#define TIER_ONE 1
#include "ceval_macros.h"
int _Py_CheckRecursiveCallPy(
PyThreadState *tstate)
{
if (tstate->recursion_headroom) {
if (tstate->py_recursion_remaining < -50) {
/* Overflowing while handling an overflow. Give up. */
Py_FatalError("Cannot recover from Python stack overflow.");
}
}
else {
if (tstate->py_recursion_remaining <= 0) {
tstate->recursion_headroom++;
_PyErr_Format(tstate, PyExc_RecursionError,
"maximum recursion depth exceeded");
tstate->recursion_headroom--;
return -1;
}
}
return 0;
}
static const _Py_CODEUNIT _Py_INTERPRETER_TRAMPOLINE_INSTRUCTIONS[] = {
/* Put a NOP at the start, so that the IP points into
* the code, rather than before it */
{ .op.code = NOP, .op.arg = 0 },
{ .op.code = INTERPRETER_EXIT, .op.arg = 0 },
{ .op.code = RESUME, .op.arg = 0 }
};
extern const struct _PyCode_DEF(8) _Py_InitCleanup;
/* Disable unused label warnings. They are handy for debugging, even
if computed gotos aren't used. */
/* TBD - what about other compilers? */
#if defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wunused-label"
#elif defined(_MSC_VER) /* MS_WINDOWS */
# pragma warning(push)
# pragma warning(disable:4102)
#endif
/* _PyEval_EvalFrameDefault() is a *big* function,
* so consume 3 units of C stack */
#define PY_EVAL_C_STACK_UNITS 2
PyObject* _Py_HOT_FUNCTION
_PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int throwflag)
{
_Py_EnsureTstateNotNULL(tstate);
CALL_STAT_INC(pyeval_calls);
#if USE_COMPUTED_GOTOS
/* Import the static jump table */
#include "opcode_targets.h"
#endif
#ifdef Py_STATS
int lastopcode = 0;
#endif
// opcode is an 8-bit value to improve the code generated by MSVC
// for the big switch below (in combination with the EXTRA_CASES macro).
uint8_t opcode; /* Current opcode */
int oparg; /* Current opcode argument, if any */
#ifdef LLTRACE
int lltrace = 0;
#endif
_PyInterpreterFrame entry_frame;
#ifdef Py_DEBUG
/* Set these to invalid but identifiable values for debugging. */
entry_frame.f_funcobj = (PyObject*)0xaaa0;
entry_frame.f_locals = (PyObject*)0xaaa1;
entry_frame.frame_obj = (PyFrameObject*)0xaaa2;
entry_frame.f_globals = (PyObject*)0xaaa3;
entry_frame.f_builtins = (PyObject*)0xaaa4;
#endif
entry_frame.f_executable = Py_None;
entry_frame.prev_instr = (_Py_CODEUNIT *)_Py_INTERPRETER_TRAMPOLINE_INSTRUCTIONS;
entry_frame.stacktop = 0;
entry_frame.owner = FRAME_OWNED_BY_CSTACK;
entry_frame.return_offset = 0;
/* Push frame */
entry_frame.previous = tstate->current_frame;
frame->previous = &entry_frame;
tstate->current_frame = frame;
tstate->c_recursion_remaining -= (PY_EVAL_C_STACK_UNITS - 1);
if (_Py_EnterRecursiveCallTstate(tstate, "")) {
tstate->c_recursion_remaining--;
tstate->py_recursion_remaining--;
goto exit_unwind;
}
/* support for generator.throw() */
if (throwflag) {
if (_Py_EnterRecursivePy(tstate)) {
goto exit_unwind;
}
/* Because this avoids the RESUME,
* we need to update instrumentation */
_Py_Instrument(_PyFrame_GetCode(frame), tstate->interp);
monitor_throw(tstate, frame, frame->prev_instr);
/* TO DO -- Monitor throw entry. */
goto resume_with_error;
}
/* Local "register" variables.
* These are cached values from the frame and code object. */
_Py_CODEUNIT *next_instr;
PyObject **stack_pointer;
/* Sets the above local variables from the frame */
#define SET_LOCALS_FROM_FRAME() \
/* Jump back to the last instruction executed... */ \
next_instr = frame->prev_instr + 1; \
stack_pointer = _PyFrame_GetStackPointer(frame);
start_frame:
if (_Py_EnterRecursivePy(tstate)) {
goto exit_unwind;
}
resume_frame:
SET_LOCALS_FROM_FRAME();
#ifdef LLTRACE
lltrace = maybe_lltrace_resume_frame(frame, &entry_frame, GLOBALS());
if (lltrace < 0) {
goto exit_unwind;
}
#endif
#ifdef Py_DEBUG
/* _PyEval_EvalFrameDefault() must not be called with an exception set,
because it can clear it (directly or indirectly) and so the
caller loses its exception */
assert(!_PyErr_Occurred(tstate));
#endif
DISPATCH();
{
/* Start instructions */
#if !USE_COMPUTED_GOTOS
dispatch_opcode:
switch (opcode)
#endif
{
#include "generated_cases.c.h"
/* INSTRUMENTED_LINE has to be here, rather than in bytecodes.c,
* because it needs to capture frame->prev_instr before it is updated,
* as happens in the standard instruction prologue.
*/
#if USE_COMPUTED_GOTOS
TARGET_INSTRUMENTED_LINE:
#else
case INSTRUMENTED_LINE:
#endif
{
_Py_CODEUNIT *prev = frame->prev_instr;
_Py_CODEUNIT *here = frame->prev_instr = next_instr;
_PyFrame_SetStackPointer(frame, stack_pointer);
int original_opcode = _Py_call_instrumentation_line(
tstate, frame, here, prev);
stack_pointer = _PyFrame_GetStackPointer(frame);
if (original_opcode < 0) {
next_instr = here+1;
goto error;
}
next_instr = frame->prev_instr;
if (next_instr != here) {
DISPATCH();
}
if (_PyOpcode_Caches[original_opcode]) {
_PyBinaryOpCache *cache = (_PyBinaryOpCache *)(next_instr+1);
/* Prevent the underlying instruction from specializing
* and overwriting the instrumentation. */
INCREMENT_ADAPTIVE_COUNTER(cache->counter);
}
opcode = original_opcode;
DISPATCH_GOTO();
}
#if USE_COMPUTED_GOTOS
_unknown_opcode:
#else
EXTRA_CASES // From pycore_opcode.h, a 'case' for each unused opcode
#endif
/* Tell C compilers not to hold the opcode variable in the loop.
next_instr points the current instruction without TARGET(). */
opcode = next_instr->op.code;
_PyErr_Format(tstate, PyExc_SystemError,
"%U:%d: unknown opcode %d",
_PyFrame_GetCode(frame)->co_filename,
PyUnstable_InterpreterFrame_GetLine(frame),
opcode);
goto error;
} /* End instructions */
/* This should never be reached. Every opcode should end with DISPATCH()
or goto error. */
Py_UNREACHABLE();
unbound_local_error:
{
_PyEval_FormatExcCheckArg(tstate, PyExc_UnboundLocalError,
UNBOUNDLOCAL_ERROR_MSG,
PyTuple_GetItem(_PyFrame_GetCode(frame)->co_localsplusnames, oparg)
);
goto error;
}
pop_4_error:
STACK_SHRINK(1);
pop_3_error:
STACK_SHRINK(1);
pop_2_error:
STACK_SHRINK(1);
pop_1_error:
STACK_SHRINK(1);
error:
/* Double-check exception status. */
#ifdef NDEBUG
if (!_PyErr_Occurred(tstate)) {
_PyErr_SetString(tstate, PyExc_SystemError,
"error return without exception set");
}
#else
assert(_PyErr_Occurred(tstate));
#endif
/* Log traceback info. */
assert(frame != &entry_frame);
if (!_PyFrame_IsIncomplete(frame)) {
PyFrameObject *f = _PyFrame_GetFrameObject(frame);
if (f != NULL) {
PyTraceBack_Here(f);
}
}
monitor_raise(tstate, frame, next_instr-1);
exception_unwind:
{
/* We can't use frame->f_lasti here, as RERAISE may have set it */
int offset = INSTR_OFFSET()-1;
int level, handler, lasti;
if (get_exception_handler(_PyFrame_GetCode(frame), offset, &level, &handler, &lasti) == 0) {
// No handlers, so exit.
assert(_PyErr_Occurred(tstate));
/* Pop remaining stack entries. */
PyObject **stackbase = _PyFrame_Stackbase(frame);
while (stack_pointer > stackbase) {
PyObject *o = POP();
Py_XDECREF(o);
}
assert(STACK_LEVEL() == 0);
_PyFrame_SetStackPointer(frame, stack_pointer);
monitor_unwind(tstate, frame, next_instr-1);
goto exit_unwind;
}
assert(STACK_LEVEL() >= level);
PyObject **new_top = _PyFrame_Stackbase(frame) + level;
while (stack_pointer > new_top) {
PyObject *v = POP();
Py_XDECREF(v);
}
if (lasti) {
int frame_lasti = _PyInterpreterFrame_LASTI(frame);
PyObject *lasti = PyLong_FromLong(frame_lasti);
if (lasti == NULL) {
goto exception_unwind;
}
PUSH(lasti);
}
/* Make the raw exception data
available to the handler,
so a program can emulate the
Python main loop. */
PyObject *exc = _PyErr_GetRaisedException(tstate);
PUSH(exc);
JUMPTO(handler);
if (monitor_handled(tstate, frame, next_instr, exc) < 0) {
goto exception_unwind;
}
/* Resume normal execution */
#ifdef LLTRACE
if (lltrace) {
lltrace_resume_frame(frame);
}
#endif
DISPATCH();
}
}
exit_unwind:
assert(_PyErr_Occurred(tstate));
_Py_LeaveRecursiveCallPy(tstate);
assert(frame != &entry_frame);
// GH-99729: We need to unlink the frame *before* clearing it:
_PyInterpreterFrame *dying = frame;
frame = tstate->current_frame = dying->previous;
_PyEval_FrameClearAndPop(tstate, dying);
frame->return_offset = 0;
if (frame == &entry_frame) {
/* Restore previous frame and exit */
tstate->current_frame = frame->previous;
tstate->c_recursion_remaining += PY_EVAL_C_STACK_UNITS;
return NULL;
}
resume_with_error:
SET_LOCALS_FROM_FRAME();
goto error;
}
#if defined(__GNUC__)
# pragma GCC diagnostic pop
#elif defined(_MSC_VER) /* MS_WINDOWS */
# pragma warning(pop)
#endif
static void
format_missing(PyThreadState *tstate, const char *kind,
PyCodeObject *co, PyObject *names, PyObject *qualname)
{
int err;
Py_ssize_t len = PyList_GET_SIZE(names);
PyObject *name_str, *comma, *tail, *tmp;
assert(PyList_CheckExact(names));
assert(len >= 1);
/* Deal with the joys of natural language. */
switch (len) {
case 1:
name_str = PyList_GET_ITEM(names, 0);
Py_INCREF(name_str);
break;
case 2:
name_str = PyUnicode_FromFormat("%U and %U",
PyList_GET_ITEM(names, len - 2),
PyList_GET_ITEM(names, len - 1));
break;
default:
tail = PyUnicode_FromFormat(", %U, and %U",
PyList_GET_ITEM(names, len - 2),
PyList_GET_ITEM(names, len - 1));
if (tail == NULL)
return;
/* Chop off the last two objects in the list. This shouldn't actually
fail, but we can't be too careful. */
err = PyList_SetSlice(names, len - 2, len, NULL);
if (err == -1) {
Py_DECREF(tail);
return;
}
/* Stitch everything up into a nice comma-separated list. */
comma = PyUnicode_FromString(", ");
if (comma == NULL) {
Py_DECREF(tail);
return;
}
tmp = PyUnicode_Join(comma, names);
Py_DECREF(comma);
if (tmp == NULL) {
Py_DECREF(tail);
return;
}
name_str = PyUnicode_Concat(tmp, tail);
Py_DECREF(tmp);
Py_DECREF(tail);