forked from schacon/perl
-
Notifications
You must be signed in to change notification settings - Fork 0
/
op.c
5108 lines (4629 loc) · 116 KB
/
op.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
/* op.c
*
* Copyright (c) 1991-1997, Larry Wall
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* "You see: Mr. Drogo, he married poor Miss Primula Brandybuck. She was
* our Mr. Bilbo's first cousin on the mother's side (her mother being the
* youngest of the Old Took's daughters); and Mr. Drogo was his second
* cousin. So Mr. Frodo is his first *and* second cousin, once removed
* either way, as the saying is, if you follow me." --the Gaffer
*/
#include "EXTERN.h"
#include "perl.h"
#ifdef PERL_OBJECT
#define CHECKCALL this->*check
#else
#define CHECKCALL *check
#endif
/*
* In the following definition, the ", Nullop" is just to make the compiler
* think the expression is of the right type: croak actually does a Siglongjmp.
*/
#define CHECKOP(type,o) \
((PL_op_mask && PL_op_mask[type]) \
? ( op_free((OP*)o), \
croak("%s trapped by operation mask", op_desc[type]), \
Nullop ) \
: (CHECKCALL[type])((OP*)o))
static bool scalar_mod_type _((OP *o, I32 type));
#ifndef PERL_OBJECT
static I32 list_assignment _((OP *o));
static void bad_type _((I32 n, char *t, char *name, OP *kid));
static OP *modkids _((OP *o, I32 type));
static OP *no_fh_allowed _((OP *o));
static OP *scalarboolean _((OP *o));
static OP *too_few_arguments _((OP *o, char* name));
static OP *too_many_arguments _((OP *o, char* name));
static void null _((OP* o));
static PADOFFSET pad_findlex _((char* name, PADOFFSET newoff, U32 seq,
CV* startcv, I32 cx_ix));
static OP *newDEFSVOP _((void));
static OP *new_logop _((I32 type, I32 flags, OP **firstp, OP **otherp));
#endif
STATIC char*
gv_ename(GV *gv)
{
SV* tmpsv = sv_newmortal();
gv_efullname3(tmpsv, gv, Nullch);
return SvPV(tmpsv,PL_na);
}
STATIC OP *
no_fh_allowed(OP *o)
{
yyerror(form("Missing comma after first argument to %s function",
op_desc[o->op_type]));
return o;
}
STATIC OP *
too_few_arguments(OP *o, char *name)
{
yyerror(form("Not enough arguments for %s", name));
return o;
}
STATIC OP *
too_many_arguments(OP *o, char *name)
{
yyerror(form("Too many arguments for %s", name));
return o;
}
STATIC void
bad_type(I32 n, char *t, char *name, OP *kid)
{
yyerror(form("Type of arg %d to %s must be %s (not %s)",
(int)n, name, t, op_desc[kid->op_type]));
}
void
assertref(OP *o)
{
int type = o->op_type;
if (type != OP_AELEM && type != OP_HELEM) {
yyerror(form("Can't use subscript on %s", op_desc[type]));
if (type == OP_ENTERSUB || type == OP_RV2HV || type == OP_PADHV) {
dTHR;
SV *msg = sv_2mortal(
newSVpvf("(Did you mean $ or @ instead of %c?)\n",
type == OP_ENTERSUB ? '&' : '%'));
if (PL_in_eval & 2)
warn("%_", msg);
else if (PL_in_eval)
sv_catsv(GvSV(PL_errgv), msg);
else
PerlIO_write(PerlIO_stderr(), SvPVX(msg), SvCUR(msg));
}
}
}
/* "register" allocation */
PADOFFSET
pad_allocmy(char *name)
{
dTHR;
PADOFFSET off;
SV *sv;
if (!(isALPHA(name[1]) || name[1] == '_' && (int)strlen(name) > 2)) {
if (!isPRINT(name[1])) {
name[3] = '\0';
name[2] = toCTRL(name[1]);
name[1] = '^';
}
croak("Can't use global %s in \"my\"",name);
}
if (PL_dowarn && AvFILLp(PL_comppad_name) >= 0) {
SV **svp = AvARRAY(PL_comppad_name);
for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_floor; off--) {
if ((sv = svp[off])
&& sv != &PL_sv_undef
&& SvIVX(sv) == 999999999 /* var is in open scope */
&& strEQ(name, SvPVX(sv)))
{
warn("\"my\" variable %s masks earlier declaration in same scope", name);
break;
}
}
}
off = pad_alloc(OP_PADSV, SVs_PADMY);
sv = NEWSV(1102,0);
sv_upgrade(sv, SVt_PVNV);
sv_setpv(sv, name);
if (PL_in_my_stash) {
if (*name != '$')
croak("Can't declare class for non-scalar %s in \"my\"",name);
SvOBJECT_on(sv);
(void)SvUPGRADE(sv, SVt_PVMG);
SvSTASH(sv) = (HV*)SvREFCNT_inc(PL_in_my_stash);
PL_sv_objcount++;
}
av_store(PL_comppad_name, off, sv);
SvNVX(sv) = (double)999999999;
SvIVX(sv) = 0; /* Not yet introduced--see newSTATEOP */
if (!PL_min_intro_pending)
PL_min_intro_pending = off;
PL_max_intro_pending = off;
if (*name == '@')
av_store(PL_comppad, off, (SV*)newAV());
else if (*name == '%')
av_store(PL_comppad, off, (SV*)newHV());
SvPADMY_on(PL_curpad[off]);
return off;
}
STATIC PADOFFSET
pad_findlex(char *name, PADOFFSET newoff, U32 seq, CV* startcv, I32 cx_ix)
{
dTHR;
CV *cv;
I32 off;
SV *sv;
register I32 i;
register PERL_CONTEXT *cx;
int saweval;
for (cv = startcv; cv; cv = CvOUTSIDE(cv)) {
AV *curlist = CvPADLIST(cv);
SV **svp = av_fetch(curlist, 0, FALSE);
AV *curname;
if (!svp || *svp == &PL_sv_undef)
continue;
curname = (AV*)*svp;
svp = AvARRAY(curname);
for (off = AvFILLp(curname); off > 0; off--) {
if ((sv = svp[off]) &&
sv != &PL_sv_undef &&
seq <= SvIVX(sv) &&
seq > I_32(SvNVX(sv)) &&
strEQ(SvPVX(sv), name))
{
I32 depth;
AV *oldpad;
SV *oldsv;
depth = CvDEPTH(cv);
if (!depth) {
if (newoff) {
if (SvFAKE(sv))
continue;
return 0; /* don't clone from inactive stack frame */
}
depth = 1;
}
oldpad = (AV*)*av_fetch(curlist, depth, FALSE);
oldsv = *av_fetch(oldpad, off, TRUE);
if (!newoff) { /* Not a mere clone operation. */
SV *namesv = NEWSV(1103,0);
newoff = pad_alloc(OP_PADSV, SVs_PADMY);
sv_upgrade(namesv, SVt_PVNV);
sv_setpv(namesv, name);
av_store(PL_comppad_name, newoff, namesv);
SvNVX(namesv) = (double)PL_curcop->cop_seq;
SvIVX(namesv) = 999999999; /* A ref, intro immediately */
SvFAKE_on(namesv); /* A ref, not a real var */
if (CvANON(PL_compcv) || SvTYPE(PL_compcv) == SVt_PVFM) {
/* "It's closures all the way down." */
CvCLONE_on(PL_compcv);
if (cv == startcv) {
if (CvANON(PL_compcv))
oldsv = Nullsv; /* no need to keep ref */
}
else {
CV *bcv;
for (bcv = startcv;
bcv && bcv != cv && !CvCLONE(bcv);
bcv = CvOUTSIDE(bcv)) {
if (CvANON(bcv))
CvCLONE_on(bcv);
else {
if (PL_dowarn && !CvUNIQUE(cv))
warn(
"Variable \"%s\" may be unavailable",
name);
break;
}
}
}
}
else if (!CvUNIQUE(PL_compcv)) {
if (PL_dowarn && !SvFAKE(sv) && !CvUNIQUE(cv))
warn("Variable \"%s\" will not stay shared", name);
}
}
av_store(PL_comppad, newoff, SvREFCNT_inc(oldsv));
return newoff;
}
}
}
/* Nothing in current lexical context--try eval's context, if any.
* This is necessary to let the perldb get at lexically scoped variables.
* XXX This will also probably interact badly with eval tree caching.
*/
saweval = 0;
for (i = cx_ix; i >= 0; i--) {
cx = &cxstack[i];
switch (cx->cx_type) {
default:
if (i == 0 && saweval) {
seq = cxstack[saweval].blk_oldcop->cop_seq;
return pad_findlex(name, newoff, seq, PL_main_cv, 0);
}
break;
case CXt_EVAL:
switch (cx->blk_eval.old_op_type) {
case OP_ENTEREVAL:
saweval = i;
break;
case OP_REQUIRE:
/* require must have its own scope */
return 0;
}
break;
case CXt_SUB:
if (!saweval)
return 0;
cv = cx->blk_sub.cv;
if (PL_debstash && CvSTASH(cv) == PL_debstash) { /* ignore DB'* scope */
saweval = i; /* so we know where we were called from */
continue;
}
seq = cxstack[saweval].blk_oldcop->cop_seq;
return pad_findlex(name, newoff, seq, cv, i-1);
}
}
return 0;
}
PADOFFSET
pad_findmy(char *name)
{
dTHR;
I32 off;
I32 pendoff = 0;
SV *sv;
SV **svp = AvARRAY(PL_comppad_name);
U32 seq = PL_cop_seqmax;
#ifdef USE_THREADS
/*
* Special case to get lexical (and hence per-thread) @_.
* XXX I need to find out how to tell at parse-time whether use
* of @_ should refer to a lexical (from a sub) or defgv (global
* scope and maybe weird sub-ish things like formats). See
* startsub in perly.y. It's possible that @_ could be lexical
* (at least from subs) even in non-threaded perl.
*/
if (strEQ(name, "@_"))
return 0; /* success. (NOT_IN_PAD indicates failure) */
#endif /* USE_THREADS */
/* The one we're looking for is probably just before comppad_name_fill. */
for (off = AvFILLp(PL_comppad_name); off > 0; off--) {
if ((sv = svp[off]) &&
sv != &PL_sv_undef &&
(!SvIVX(sv) ||
(seq <= SvIVX(sv) &&
seq > I_32(SvNVX(sv)))) &&
strEQ(SvPVX(sv), name))
{
if (SvIVX(sv))
return (PADOFFSET)off;
pendoff = off; /* this pending def. will override import */
}
}
/* See if it's in a nested scope */
off = pad_findlex(name, 0, seq, CvOUTSIDE(PL_compcv), cxstack_ix);
if (off) {
/* If there is a pending local definition, this new alias must die */
if (pendoff)
SvIVX(AvARRAY(PL_comppad_name)[off]) = seq;
return off; /* pad_findlex returns 0 for failure...*/
}
return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */
}
void
pad_leavemy(I32 fill)
{
I32 off;
SV **svp = AvARRAY(PL_comppad_name);
SV *sv;
if (PL_min_intro_pending && fill < PL_min_intro_pending) {
for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) {
if ((sv = svp[off]) && sv != &PL_sv_undef)
warn("%s never introduced", SvPVX(sv));
}
}
/* "Deintroduce" my variables that are leaving with this scope. */
for (off = AvFILLp(PL_comppad_name); off > fill; off--) {
if ((sv = svp[off]) && sv != &PL_sv_undef && SvIVX(sv) == 999999999)
SvIVX(sv) = PL_cop_seqmax;
}
}
PADOFFSET
pad_alloc(I32 optype, U32 tmptype)
{
dTHR;
SV *sv;
I32 retval;
if (AvARRAY(PL_comppad) != PL_curpad)
croak("panic: pad_alloc");
if (PL_pad_reset_pending)
pad_reset();
if (tmptype & SVs_PADMY) {
do {
sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE);
} while (SvPADBUSY(sv)); /* need a fresh one */
retval = AvFILLp(PL_comppad);
}
else {
SV **names = AvARRAY(PL_comppad_name);
SSize_t names_fill = AvFILLp(PL_comppad_name);
for (;;) {
/*
* "foreach" index vars temporarily become aliases to non-"my"
* values. Thus we must skip, not just pad values that are
* marked as current pad values, but also those with names.
*/
if (++PL_padix <= names_fill &&
(sv = names[PL_padix]) && sv != &PL_sv_undef)
continue;
sv = *av_fetch(PL_comppad, PL_padix, TRUE);
if (!(SvFLAGS(sv) & (SVs_PADTMP|SVs_PADMY)))
break;
}
retval = PL_padix;
}
SvFLAGS(sv) |= tmptype;
PL_curpad = AvARRAY(PL_comppad);
#ifdef USE_THREADS
DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx alloc %ld for %s\n",
(unsigned long) thr, (unsigned long) PL_curpad,
(long) retval, op_name[optype]));
#else
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx alloc %ld for %s\n",
(unsigned long) PL_curpad,
(long) retval, op_name[optype]));
#endif /* USE_THREADS */
return (PADOFFSET)retval;
}
SV *
pad_sv(PADOFFSET po)
{
dTHR;
#ifdef USE_THREADS
DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx sv %d\n",
(unsigned long) thr, (unsigned long) PL_curpad, po));
#else
if (!po)
croak("panic: pad_sv po");
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx sv %d\n",
(unsigned long) PL_curpad, po));
#endif /* USE_THREADS */
return PL_curpad[po]; /* eventually we'll turn this into a macro */
}
void
pad_free(PADOFFSET po)
{
dTHR;
if (!PL_curpad)
return;
if (AvARRAY(PL_comppad) != PL_curpad)
croak("panic: pad_free curpad");
if (!po)
croak("panic: pad_free po");
#ifdef USE_THREADS
DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx free %d\n",
(unsigned long) thr, (unsigned long) PL_curpad, po));
#else
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx free %d\n",
(unsigned long) PL_curpad, po));
#endif /* USE_THREADS */
if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef)
SvPADTMP_off(PL_curpad[po]);
if ((I32)po < PL_padix)
PL_padix = po - 1;
}
void
pad_swipe(PADOFFSET po)
{
dTHR;
if (AvARRAY(PL_comppad) != PL_curpad)
croak("panic: pad_swipe curpad");
if (!po)
croak("panic: pad_swipe po");
#ifdef USE_THREADS
DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx swipe %d\n",
(unsigned long) thr, (unsigned long) PL_curpad, po));
#else
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx swipe %d\n",
(unsigned long) PL_curpad, po));
#endif /* USE_THREADS */
SvPADTMP_off(PL_curpad[po]);
PL_curpad[po] = NEWSV(1107,0);
SvPADTMP_on(PL_curpad[po]);
if ((I32)po < PL_padix)
PL_padix = po - 1;
}
/* XXX pad_reset() is currently disabled because it results in serious bugs.
* It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed
* on the stack by OPs that use them, there are several ways to get an alias
* to a shared TARG. Such an alias will change randomly and unpredictably.
* We avoid doing this until we can think of a Better Way.
* GSAR 97-10-29 */
void
pad_reset(void)
{
#ifdef USE_BROKEN_PAD_RESET
dTHR;
register I32 po;
if (AvARRAY(PL_comppad) != PL_curpad)
croak("panic: pad_reset curpad");
#ifdef USE_THREADS
DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx reset\n",
(unsigned long) thr, (unsigned long) PL_curpad));
#else
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx reset\n",
(unsigned long) PL_curpad));
#endif /* USE_THREADS */
if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */
for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) {
if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po]))
SvPADTMP_off(PL_curpad[po]);
}
PL_padix = PL_padix_floor;
}
#endif
PL_pad_reset_pending = FALSE;
}
#ifdef USE_THREADS
/* find_threadsv is not reentrant */
PADOFFSET
find_threadsv(char *name)
{
dTHR;
char *p;
PADOFFSET key;
SV **svp;
/* We currently only handle names of a single character */
p = strchr(PL_threadsv_names, *name);
if (!p)
return NOT_IN_PAD;
key = p - PL_threadsv_names;
svp = av_fetch(thr->threadsv, key, FALSE);
if (!svp) {
SV *sv = NEWSV(0, 0);
av_store(thr->threadsv, key, sv);
thr->threadsvp = AvARRAY(thr->threadsv);
/*
* Some magic variables used to be automagically initialised
* in gv_fetchpv. Those which are now per-thread magicals get
* initialised here instead.
*/
switch (*name) {
case '_':
break;
case ';':
sv_setpv(sv, "\034");
sv_magic(sv, 0, 0, name, 1);
break;
case '&':
case '`':
case '\'':
PL_sawampersand = TRUE;
SvREADONLY_on(sv);
/* FALL THROUGH */
/* XXX %! tied to Errno.pm needs to be added here.
* See gv_fetchpv(). */
/* case '!': */
default:
sv_magic(sv, 0, 0, name, 1);
}
DEBUG_L(PerlIO_printf(PerlIO_stderr(),
"find_threadsv: new SV %p for $%s%c\n",
sv, (*name < 32) ? "^" : "",
(*name < 32) ? toCTRL(*name) : *name));
}
return key;
}
#endif /* USE_THREADS */
/* Destructor */
void
op_free(OP *o)
{
register OP *kid, *nextkid;
if (!o || o->op_seq == (U16)-1)
return;
if (o->op_flags & OPf_KIDS) {
for (kid = cUNOPo->op_first; kid; kid = nextkid) {
nextkid = kid->op_sibling; /* Get before next freeing kid */
op_free(kid);
}
}
switch (o->op_type) {
case OP_NULL:
o->op_targ = 0; /* Was holding old type, if any. */
break;
case OP_ENTEREVAL:
o->op_targ = 0; /* Was holding hints. */
break;
#ifdef USE_THREADS
case OP_THREADSV:
o->op_targ = 0; /* Was holding index into thr->threadsv AV. */
break;
#endif /* USE_THREADS */
default:
if (!(o->op_flags & OPf_REF)
|| (check[o->op_type] != FUNC_NAME_TO_PTR(ck_ftst)))
break;
/* FALL THROUGH */
case OP_GVSV:
case OP_GV:
case OP_AELEMFAST:
SvREFCNT_dec(cGVOPo->op_gv);
break;
case OP_NEXTSTATE:
case OP_DBSTATE:
Safefree(cCOPo->cop_label);
SvREFCNT_dec(cCOPo->cop_filegv);
break;
case OP_CONST:
SvREFCNT_dec(cSVOPo->op_sv);
break;
case OP_GOTO:
case OP_NEXT:
case OP_LAST:
case OP_REDO:
if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
break;
/* FALL THROUGH */
case OP_TRANS:
Safefree(cPVOPo->op_pv);
break;
case OP_SUBST:
op_free(cPMOPo->op_pmreplroot);
/* FALL THROUGH */
case OP_PUSHRE:
case OP_MATCH:
case OP_QR:
ReREFCNT_dec(cPMOPo->op_pmregexp);
break;
}
if (o->op_targ > 0)
pad_free(o->op_targ);
Safefree(o);
}
STATIC void
null(OP *o)
{
if (o->op_type != OP_NULL && o->op_type != OP_THREADSV && o->op_targ > 0)
pad_free(o->op_targ);
o->op_targ = o->op_type;
o->op_type = OP_NULL;
o->op_ppaddr = ppaddr[OP_NULL];
}
/* Contextualizers */
#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
OP *
linklist(OP *o)
{
register OP *kid;
if (o->op_next)
return o->op_next;
/* establish postfix order */
if (cUNOPo->op_first) {
o->op_next = LINKLIST(cUNOPo->op_first);
for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
if (kid->op_sibling)
kid->op_next = LINKLIST(kid->op_sibling);
else
kid->op_next = o;
}
}
else
o->op_next = o;
return o->op_next;
}
OP *
scalarkids(OP *o)
{
OP *kid;
if (o && o->op_flags & OPf_KIDS) {
for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
scalar(kid);
}
return o;
}
STATIC OP *
scalarboolean(OP *o)
{
if (PL_dowarn &&
o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
dTHR;
line_t oldline = PL_curcop->cop_line;
if (PL_copline != NOLINE)
PL_curcop->cop_line = PL_copline;
warn("Found = in conditional, should be ==");
PL_curcop->cop_line = oldline;
}
return scalar(o);
}
OP *
scalar(OP *o)
{
OP *kid;
/* assumes no premature commitment */
if (!o || (o->op_flags & OPf_WANT) || PL_error_count
|| o->op_type == OP_RETURN)
return o;
o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
switch (o->op_type) {
case OP_REPEAT:
if (o->op_private & OPpREPEAT_DOLIST)
null(((LISTOP*)cBINOPo->op_first)->op_first);
scalar(cBINOPo->op_first);
break;
case OP_OR:
case OP_AND:
case OP_COND_EXPR:
for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
scalar(kid);
break;
case OP_SPLIT:
if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
if (!kPMOP->op_pmreplroot)
deprecate("implicit split to @_");
}
/* FALL THROUGH */
case OP_MATCH:
case OP_QR:
case OP_SUBST:
case OP_NULL:
default:
if (o->op_flags & OPf_KIDS) {
for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
scalar(kid);
}
break;
case OP_LEAVE:
case OP_LEAVETRY:
kid = cLISTOPo->op_first;
scalar(kid);
while (kid = kid->op_sibling) {
if (kid->op_sibling)
scalarvoid(kid);
else
scalar(kid);
}
WITH_THR(PL_curcop = &PL_compiling);
break;
case OP_SCOPE:
case OP_LINESEQ:
case OP_LIST:
for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
if (kid->op_sibling)
scalarvoid(kid);
else
scalar(kid);
}
WITH_THR(PL_curcop = &PL_compiling);
break;
}
return o;
}
OP *
scalarvoid(OP *o)
{
OP *kid;
char* useless = 0;
SV* sv;
/* assumes no premature commitment */
if (!o || (o->op_flags & OPf_WANT) == OPf_WANT_LIST || PL_error_count
|| o->op_type == OP_RETURN)
return o;
o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
switch (o->op_type) {
default:
if (!(opargs[o->op_type] & OA_FOLDCONST))
break;
/* FALL THROUGH */
case OP_REPEAT:
if (o->op_flags & OPf_STACKED)
break;
goto func_ops;
case OP_SUBSTR:
if (o->op_private == 4)
break;
/* FALL THROUGH */
case OP_GVSV:
case OP_WANTARRAY:
case OP_GV:
case OP_PADSV:
case OP_PADAV:
case OP_PADHV:
case OP_PADANY:
case OP_AV2ARYLEN:
case OP_REF:
case OP_REFGEN:
case OP_SREFGEN:
case OP_DEFINED:
case OP_HEX:
case OP_OCT:
case OP_LENGTH:
case OP_VEC:
case OP_INDEX:
case OP_RINDEX:
case OP_SPRINTF:
case OP_AELEM:
case OP_AELEMFAST:
case OP_ASLICE:
case OP_HELEM:
case OP_HSLICE:
case OP_UNPACK:
case OP_PACK:
case OP_JOIN:
case OP_LSLICE:
case OP_ANONLIST:
case OP_ANONHASH:
case OP_SORT:
case OP_REVERSE:
case OP_RANGE:
case OP_FLIP:
case OP_FLOP:
case OP_CALLER:
case OP_FILENO:
case OP_EOF:
case OP_TELL:
case OP_GETSOCKNAME:
case OP_GETPEERNAME:
case OP_READLINK:
case OP_TELLDIR:
case OP_GETPPID:
case OP_GETPGRP:
case OP_GETPRIORITY:
case OP_TIME:
case OP_TMS:
case OP_LOCALTIME:
case OP_GMTIME:
case OP_GHBYNAME:
case OP_GHBYADDR:
case OP_GHOSTENT:
case OP_GNBYNAME:
case OP_GNBYADDR:
case OP_GNETENT:
case OP_GPBYNAME:
case OP_GPBYNUMBER:
case OP_GPROTOENT:
case OP_GSBYNAME:
case OP_GSBYPORT:
case OP_GSERVENT:
case OP_GPWNAM:
case OP_GPWUID:
case OP_GGRNAM:
case OP_GGRGID:
case OP_GETLOGIN:
func_ops:
if (!(o->op_private & OPpLVAL_INTRO))
useless = op_desc[o->op_type];
break;
case OP_RV2GV:
case OP_RV2SV:
case OP_RV2AV:
case OP_RV2HV:
if (!(o->op_private & OPpLVAL_INTRO) &&
(!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
useless = "a variable";
break;
case OP_NEXTSTATE:
case OP_DBSTATE:
WITH_THR(PL_curcop = ((COP*)o)); /* for warning below */
break;
case OP_CONST:
sv = cSVOPo->op_sv;
if (PL_dowarn) {
useless = "a constant";
if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
useless = 0;
else if (SvPOK(sv)) {
if (strnEQ(SvPVX(sv), "di", 2) ||
strnEQ(SvPVX(sv), "ds", 2) ||
strnEQ(SvPVX(sv), "ig", 2))
useless = 0;
}
}
null(o); /* don't execute a constant */
SvREFCNT_dec(sv); /* don't even remember it */
break;
case OP_POSTINC:
o->op_type = OP_PREINC; /* pre-increment is faster */
o->op_ppaddr = ppaddr[OP_PREINC];
break;
case OP_POSTDEC:
o->op_type = OP_PREDEC; /* pre-decrement is faster */
o->op_ppaddr = ppaddr[OP_PREDEC];
break;
case OP_OR:
case OP_AND:
case OP_COND_EXPR:
for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
scalarvoid(kid);
break;
case OP_NULL:
if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
WITH_THR(PL_curcop = ((COP*)o)); /* for warning below */
if (o->op_flags & OPf_STACKED)
break;
/* FALL THROUGH */
case OP_ENTERTRY:
case OP_ENTER:
case OP_SCALAR:
if (!(o->op_flags & OPf_KIDS))
break;
/* FALL THROUGH */
case OP_SCOPE:
case OP_LEAVE:
case OP_LEAVETRY:
case OP_LEAVELOOP:
case OP_LINESEQ:
case OP_LIST:
for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
scalarvoid(kid);
break;
case OP_ENTEREVAL:
scalarkids(o);
break;
case OP_REQUIRE:
/* all requires must return a boolean value */
o->op_flags &= ~OPf_WANT;
return scalar(o);
case OP_SPLIT:
if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
if (!kPMOP->op_pmreplroot)
deprecate("implicit split to @_");
}
break;
}
if (useless && PL_dowarn)
warn("Useless use of %s in void context", useless);
return o;
}
OP *
listkids(OP *o)
{
OP *kid;
if (o && o->op_flags & OPf_KIDS) {
for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
list(kid);
}
return o;
}
OP *
list(OP *o)
{
OP *kid;
/* assumes no premature commitment */
if (!o || (o->op_flags & OPf_WANT) || PL_error_count
|| o->op_type == OP_RETURN)
return o;
o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
switch (o->op_type) {
case OP_FLOP:
case OP_REPEAT:
list(cBINOPo->op_first);
break;
case OP_OR:
case OP_AND:
case OP_COND_EXPR:
for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
list(kid);
break;
default:
case OP_MATCH:
case OP_QR:
case OP_SUBST:
case OP_NULL:
if (!(o->op_flags & OPf_KIDS))
break;
if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
list(cBINOPo->op_first);
return gen_constant_list(o);
}
case OP_LIST:
listkids(o);
break;
case OP_LEAVE: