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fix C<$1 .. $2> coredump under debugger
[perl5.git] / pp_ctl.c
CommitLineData
a0d0e21e
LW
1/* pp_ctl.c
2 *
9607fc9c 3 * Copyright (c) 1991-1997, Larry Wall
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LW
4 *
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
7 *
8 */
9
10/*
11 * Now far ahead the Road has gone,
12 * And I must follow, if I can,
13 * Pursuing it with eager feet,
14 * Until it joins some larger way
15 * Where many paths and errands meet.
16 * And whither then? I cannot say.
17 */
18
19#include "EXTERN.h"
20#include "perl.h"
21
22#ifndef WORD_ALIGN
23#define WORD_ALIGN sizeof(U16)
24#endif
25
54310121 26#define DOCATCH(o) ((CATCH_GET == TRUE) ? docatch(o) : (o))
1e422769 27
76e3520e
GS
28#ifdef PERL_OBJECT
29#define CALLOP this->*op
30#else
31#define CALLOP *op
1e422769 32static OP *docatch _((OP *o));
5dc0d613 33static OP *dofindlabel _((OP *o, char *label, OP **opstack, OP **oplimit));
a0d0e21e
LW
34static void doparseform _((SV *sv));
35static I32 dopoptoeval _((I32 startingblock));
36static I32 dopoptolabel _((char *label));
37static I32 dopoptoloop _((I32 startingblock));
38static I32 dopoptosub _((I32 startingblock));
2c375eb9 39static I32 dopoptosub_at _((PERL_CONTEXT *cxstk, I32 startingblock));
a0d0e21e 40static void save_lines _((AV *array, SV *sv));
745d3a65
HM
41static I32 sortcv _((SV *a, SV *b));
42static void qsortsv _((SV **array, size_t num_elts, I32 (*fun)(SV *a, SV *b)));
c277df42 43static OP *doeval _((int gimme, OP** startop));
76e3520e 44#endif
a0d0e21e 45
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LW
46PP(pp_wantarray)
47{
4e35701f 48 djSP;
a0d0e21e
LW
49 I32 cxix;
50 EXTEND(SP, 1);
51
52 cxix = dopoptosub(cxstack_ix);
53 if (cxix < 0)
54 RETPUSHUNDEF;
55
54310121
PP
56 switch (cxstack[cxix].blk_gimme) {
57 case G_ARRAY:
a0d0e21e 58 RETPUSHYES;
54310121 59 case G_SCALAR:
a0d0e21e 60 RETPUSHNO;
54310121
PP
61 default:
62 RETPUSHUNDEF;
63 }
a0d0e21e
LW
64}
65
66PP(pp_regcmaybe)
67{
68 return NORMAL;
69}
70
2cd61cdb
IZ
71PP(pp_regcreset)
72{
73 /* XXXX Should store the old value to allow for tie/overload - and
74 restore in regcomp, where marked with XXXX. */
75 reginterp_cnt = 0;
76 return NORMAL;
77}
78
b3eb6a9b
GS
79PP(pp_regcomp)
80{
4e35701f 81 djSP;
a0d0e21e
LW
82 register PMOP *pm = (PMOP*)cLOGOP->op_other;
83 register char *t;
84 SV *tmpstr;
85 STRLEN len;
c277df42 86 MAGIC *mg = Null(MAGIC*);
a0d0e21e
LW
87
88 tmpstr = POPs;
b3eb6a9b 89 if (SvROK(tmpstr)) {
227a8b4b 90 SV *sv = SvRV(tmpstr);
c277df42
IZ
91 if(SvMAGICAL(sv))
92 mg = mg_find(sv, 'r');
93 }
b3eb6a9b 94 if (mg) {
c277df42
IZ
95 regexp *re = (regexp *)mg->mg_obj;
96 ReREFCNT_dec(pm->op_pmregexp);
97 pm->op_pmregexp = ReREFCNT_inc(re);
98 }
99 else {
100 t = SvPV(tmpstr, len);
101
20408e3c 102 /* Check against the last compiled regexp. */
85aff577 103 if (!pm->op_pmregexp || !pm->op_pmregexp->precomp ||
20408e3c
GS
104 pm->op_pmregexp->prelen != len ||
105 memNE(pm->op_pmregexp->precomp, t, len))
85aff577 106 {
c277df42
IZ
107 if (pm->op_pmregexp) {
108 ReREFCNT_dec(pm->op_pmregexp);
109 pm->op_pmregexp = Null(REGEXP*); /* crucial if regcomp aborts */
110 }
2cd61cdb
IZ
111 if (op->op_flags & OPf_SPECIAL)
112 reginterp_cnt = I32_MAX; /* Mark as safe. */
a0d0e21e 113
c277df42 114 pm->op_pmflags = pm->op_pmpermflags; /* reset case sensitivity */
15e52e56 115 pm->op_pmregexp = CALLREGCOMP(t, t + len, pm);
2cd61cdb
IZ
116 reginterp_cnt = 0; /* XXXX Be extra paranoid - needed
117 inside tie/overload accessors. */
c277df42 118 }
4633a7c4 119 }
a0d0e21e 120
72311751
GS
121#ifndef INCOMPLETE_TAINTS
122 if (tainting) {
123 if (tainted)
124 pm->op_pmdynflags |= PMdf_TAINTED;
125 else
126 pm->op_pmdynflags &= ~PMdf_TAINTED;
127 }
128#endif
129
a0d0e21e
LW
130 if (!pm->op_pmregexp->prelen && curpm)
131 pm = curpm;
132 else if (strEQ("\\s+", pm->op_pmregexp->precomp))
133 pm->op_pmflags |= PMf_WHITE;
134
135 if (pm->op_pmflags & PMf_KEEP) {
c90c0ff4 136 pm->op_private &= ~OPpRUNTIME; /* no point compiling again */
a0d0e21e 137 cLOGOP->op_first->op_next = op->op_next;
a0d0e21e
LW
138 }
139 RETURN;
140}
141
142PP(pp_substcont)
143{
4e35701f 144 djSP;
a0d0e21e 145 register PMOP *pm = (PMOP*) cLOGOP->op_other;
c09156bb 146 register PERL_CONTEXT *cx = &cxstack[cxstack_ix];
a0d0e21e
LW
147 register SV *dstr = cx->sb_dstr;
148 register char *s = cx->sb_s;
149 register char *m = cx->sb_m;
150 char *orig = cx->sb_orig;
d9f97599 151 register REGEXP *rx = cx->sb_rx;
a0d0e21e 152
d9f97599 153 rxres_restore(&cx->sb_rxres, rx);
c90c0ff4 154
a0d0e21e
LW
155 if (cx->sb_iters++) {
156 if (cx->sb_iters > cx->sb_maxiters)
157 DIE("Substitution loop");
158
48c036b1
GS
159 if (!(cx->sb_rxtainted & 2) && SvTAINTED(TOPs))
160 cx->sb_rxtainted |= 2;
a0d0e21e 161 sv_catsv(dstr, POPs);
a0d0e21e
LW
162
163 /* Are we done */
15e52e56 164 if (cx->sb_once || !CALLREGEXEC(rx, s, cx->sb_strend, orig,
c277df42
IZ
165 s == m, Nullsv, NULL,
166 cx->sb_safebase ? 0 : REXEC_COPY_STR))
a0d0e21e
LW
167 {
168 SV *targ = cx->sb_targ;
169 sv_catpvn(dstr, s, cx->sb_strend - s);
748a9306 170
48c036b1 171 cx->sb_rxtainted |= RX_MATCH_TAINTED(rx);
9212bbba 172
4633a7c4 173 (void)SvOOK_off(targ);
cb0b1708 174 Safefree(SvPVX(targ));
748a9306
LW
175 SvPVX(targ) = SvPVX(dstr);
176 SvCUR_set(targ, SvCUR(dstr));
177 SvLEN_set(targ, SvLEN(dstr));
178 SvPVX(dstr) = 0;
179 sv_free(dstr);
48c036b1
GS
180
181 TAINT_IF(cx->sb_rxtainted & 1);
182 PUSHs(sv_2mortal(newSViv((I32)cx->sb_iters - 1)));
183
a0d0e21e 184 (void)SvPOK_only(targ);
48c036b1 185 TAINT_IF(cx->sb_rxtainted);
a0d0e21e 186 SvSETMAGIC(targ);
9212bbba 187 SvTAINT(targ);
5cd24f17 188
4633a7c4 189 LEAVE_SCOPE(cx->sb_oldsave);
a0d0e21e
LW
190 POPSUBST(cx);
191 RETURNOP(pm->op_next);
192 }
193 }
d9f97599 194 if (rx->subbase && rx->subbase != orig) {
a0d0e21e
LW
195 m = s;
196 s = orig;
d9f97599 197 cx->sb_orig = orig = rx->subbase;
a0d0e21e
LW
198 s = orig + (m - s);
199 cx->sb_strend = s + (cx->sb_strend - m);
200 }
d9f97599 201 cx->sb_m = m = rx->startp[0];
a0d0e21e 202 sv_catpvn(dstr, s, m-s);
d9f97599
GS
203 cx->sb_s = rx->endp[0];
204 cx->sb_rxtainted |= RX_MATCH_TAINTED(rx);
205 rxres_save(&cx->sb_rxres, rx);
a0d0e21e
LW
206 RETURNOP(pm->op_pmreplstart);
207}
208
c90c0ff4 209void
d9f97599 210rxres_save(void **rsp, REGEXP *rx)
c90c0ff4
PP
211{
212 UV *p = (UV*)*rsp;
213 U32 i;
214
d9f97599
GS
215 if (!p || p[1] < rx->nparens) {
216 i = 6 + rx->nparens * 2;
c90c0ff4
PP
217 if (!p)
218 New(501, p, i, UV);
219 else
220 Renew(p, i, UV);
221 *rsp = (void*)p;
222 }
223
d9f97599
GS
224 *p++ = (UV)rx->subbase;
225 rx->subbase = Nullch;
c90c0ff4 226
d9f97599 227 *p++ = rx->nparens;
c90c0ff4 228
d9f97599
GS
229 *p++ = (UV)rx->subbeg;
230 *p++ = (UV)rx->subend;
231 for (i = 0; i <= rx->nparens; ++i) {
232 *p++ = (UV)rx->startp[i];
233 *p++ = (UV)rx->endp[i];
c90c0ff4
PP
234 }
235}
236
237void
d9f97599 238rxres_restore(void **rsp, REGEXP *rx)
c90c0ff4
PP
239{
240 UV *p = (UV*)*rsp;
241 U32 i;
242
d9f97599
GS
243 Safefree(rx->subbase);
244 rx->subbase = (char*)(*p);
c90c0ff4
PP
245 *p++ = 0;
246
d9f97599 247 rx->nparens = *p++;
c90c0ff4 248
d9f97599
GS
249 rx->subbeg = (char*)(*p++);
250 rx->subend = (char*)(*p++);
251 for (i = 0; i <= rx->nparens; ++i) {
252 rx->startp[i] = (char*)(*p++);
253 rx->endp[i] = (char*)(*p++);
c90c0ff4
PP
254 }
255}
256
257void
8ac85365 258rxres_free(void **rsp)
c90c0ff4
PP
259{
260 UV *p = (UV*)*rsp;
261
262 if (p) {
263 Safefree((char*)(*p));
264 Safefree(p);
265 *rsp = Null(void*);
266 }
267}
268
a0d0e21e
LW
269PP(pp_formline)
270{
4e35701f 271 djSP; dMARK; dORIGMARK;
76e3520e 272 register SV *tmpForm = *++MARK;
a0d0e21e
LW
273 register U16 *fpc;
274 register char *t;
275 register char *f;
276 register char *s;
277 register char *send;
278 register I32 arg;
279 register SV *sv;
280 char *item;
281 I32 itemsize;
282 I32 fieldsize;
283 I32 lines = 0;
284 bool chopspace = (strchr(chopset, ' ') != Nullch);
285 char *chophere;
286 char *linemark;
a0d0e21e
LW
287 double value;
288 bool gotsome;
289 STRLEN len;
290
76e3520e
GS
291 if (!SvMAGICAL(tmpForm) || !SvCOMPILED(tmpForm)) {
292 SvREADONLY_off(tmpForm);
293 doparseform(tmpForm);
a0d0e21e
LW
294 }
295
296 SvPV_force(formtarget, len);
76e3520e 297 t = SvGROW(formtarget, len + SvCUR(tmpForm) + 1); /* XXX SvCUR bad */
a0d0e21e 298 t += len;
76e3520e 299 f = SvPV(tmpForm, len);
a0d0e21e 300 /* need to jump to the next word */
76e3520e 301 s = f + len + WORD_ALIGN - SvCUR(tmpForm) % WORD_ALIGN;
a0d0e21e
LW
302
303 fpc = (U16*)s;
304
305 for (;;) {
306 DEBUG_f( {
307 char *name = "???";
308 arg = -1;
309 switch (*fpc) {
310 case FF_LITERAL: arg = fpc[1]; name = "LITERAL"; break;
311 case FF_BLANK: arg = fpc[1]; name = "BLANK"; break;
312 case FF_SKIP: arg = fpc[1]; name = "SKIP"; break;
313 case FF_FETCH: arg = fpc[1]; name = "FETCH"; break;
314 case FF_DECIMAL: arg = fpc[1]; name = "DECIMAL"; break;
315
316 case FF_CHECKNL: name = "CHECKNL"; break;
317 case FF_CHECKCHOP: name = "CHECKCHOP"; break;
318 case FF_SPACE: name = "SPACE"; break;
319 case FF_HALFSPACE: name = "HALFSPACE"; break;
320 case FF_ITEM: name = "ITEM"; break;
321 case FF_CHOP: name = "CHOP"; break;
322 case FF_LINEGLOB: name = "LINEGLOB"; break;
323 case FF_NEWLINE: name = "NEWLINE"; break;
324 case FF_MORE: name = "MORE"; break;
325 case FF_LINEMARK: name = "LINEMARK"; break;
326 case FF_END: name = "END"; break;
327 }
328 if (arg >= 0)
760ac839 329 PerlIO_printf(PerlIO_stderr(), "%-16s%ld\n", name, (long) arg);
a0d0e21e 330 else
760ac839 331 PerlIO_printf(PerlIO_stderr(), "%-16s\n", name);
a0d0e21e
LW
332 } )
333 switch (*fpc++) {
334 case FF_LINEMARK:
335 linemark = t;
a0d0e21e
LW
336 lines++;
337 gotsome = FALSE;
338 break;
339
340 case FF_LITERAL:
341 arg = *fpc++;
342 while (arg--)
343 *t++ = *f++;
344 break;
345
346 case FF_SKIP:
347 f += *fpc++;
348 break;
349
350 case FF_FETCH:
351 arg = *fpc++;
352 f += arg;
353 fieldsize = arg;
354
355 if (MARK < SP)
356 sv = *++MARK;
357 else {
358 sv = &sv_no;
359 if (dowarn)
360 warn("Not enough format arguments");
361 }
362 break;
363
364 case FF_CHECKNL:
365 item = s = SvPV(sv, len);
366 itemsize = len;
367 if (itemsize > fieldsize)
368 itemsize = fieldsize;
369 send = chophere = s + itemsize;
370 while (s < send) {
371 if (*s & ~31)
372 gotsome = TRUE;
373 else if (*s == '\n')
374 break;
375 s++;
376 }
377 itemsize = s - item;
378 break;
379
380 case FF_CHECKCHOP:
381 item = s = SvPV(sv, len);
382 itemsize = len;
383 if (itemsize <= fieldsize) {
384 send = chophere = s + itemsize;
385 while (s < send) {
386 if (*s == '\r') {
387 itemsize = s - item;
388 break;
389 }
390 if (*s++ & ~31)
391 gotsome = TRUE;
392 }
393 }
394 else {
395 itemsize = fieldsize;
396 send = chophere = s + itemsize;
397 while (s < send || (s == send && isSPACE(*s))) {
398 if (isSPACE(*s)) {
399 if (chopspace)
400 chophere = s;
401 if (*s == '\r')
402 break;
403 }
404 else {
405 if (*s & ~31)
406 gotsome = TRUE;
407 if (strchr(chopset, *s))
408 chophere = s + 1;
409 }
410 s++;
411 }
412 itemsize = chophere - item;
413 }
414 break;
415
416 case FF_SPACE:
417 arg = fieldsize - itemsize;
418 if (arg) {
419 fieldsize -= arg;
420 while (arg-- > 0)
421 *t++ = ' ';
422 }
423 break;
424
425 case FF_HALFSPACE:
426 arg = fieldsize - itemsize;
427 if (arg) {
428 arg /= 2;
429 fieldsize -= arg;
430 while (arg-- > 0)
431 *t++ = ' ';
432 }
433 break;
434
435 case FF_ITEM:
436 arg = itemsize;
437 s = item;
438 while (arg--) {
439#if 'z' - 'a' != 25
440 int ch = *t++ = *s++;
441 if (!iscntrl(ch))
442 t[-1] = ' ';
443#else
444 if ( !((*t++ = *s++) & ~31) )
445 t[-1] = ' ';
446#endif
447
448 }
449 break;
450
451 case FF_CHOP:
452 s = chophere;
453 if (chopspace) {
454 while (*s && isSPACE(*s))
455 s++;
456 }
457 sv_chop(sv,s);
458 break;
459
460 case FF_LINEGLOB:
461 item = s = SvPV(sv, len);
462 itemsize = len;
463 if (itemsize) {
464 gotsome = TRUE;
465 send = s + itemsize;
466 while (s < send) {
467 if (*s++ == '\n') {
468 if (s == send)
469 itemsize--;
470 else
471 lines++;
472 }
473 }
474 SvCUR_set(formtarget, t - SvPVX(formtarget));
475 sv_catpvn(formtarget, item, itemsize);
76e3520e 476 SvGROW(formtarget, SvCUR(formtarget) + SvCUR(tmpForm) + 1);
a0d0e21e
LW
477 t = SvPVX(formtarget) + SvCUR(formtarget);
478 }
479 break;
480
481 case FF_DECIMAL:
482 /* If the field is marked with ^ and the value is undefined,
483 blank it out. */
484 arg = *fpc++;
485 if ((arg & 512) && !SvOK(sv)) {
486 arg = fieldsize;
487 while (arg--)
488 *t++ = ' ';
489 break;
490 }
491 gotsome = TRUE;
492 value = SvNV(sv);
bbce6d69 493 /* Formats aren't yet marked for locales, so assume "yes". */
36477c24 494 SET_NUMERIC_LOCAL();
a0d0e21e
LW
495 if (arg & 256) {
496 sprintf(t, "%#*.*f", (int) fieldsize, (int) arg & 255, value);
497 } else {
498 sprintf(t, "%*.0f", (int) fieldsize, value);
499 }
500 t += fieldsize;
501 break;
502
503 case FF_NEWLINE:
504 f++;
505 while (t-- > linemark && *t == ' ') ;
506 t++;
507 *t++ = '\n';
508 break;
509
510 case FF_BLANK:
511 arg = *fpc++;
512 if (gotsome) {
513 if (arg) { /* repeat until fields exhausted? */
514 *t = '\0';
515 SvCUR_set(formtarget, t - SvPVX(formtarget));
516 lines += FmLINES(formtarget);
517 if (lines == 200) {
518 arg = t - linemark;
519 if (strnEQ(linemark, linemark - arg, arg))
520 DIE("Runaway format");
521 }
522 FmLINES(formtarget) = lines;
523 SP = ORIGMARK;
524 RETURNOP(cLISTOP->op_first);
525 }
526 }
527 else {
528 t = linemark;
529 lines--;
530 }
531 break;
532
533 case FF_MORE:
534 if (itemsize) {
535 arg = fieldsize - itemsize;
536 if (arg) {
537 fieldsize -= arg;
538 while (arg-- > 0)
539 *t++ = ' ';
540 }
541 s = t - 3;
542 if (strnEQ(s," ",3)) {
543 while (s > SvPVX(formtarget) && isSPACE(s[-1]))
544 s--;
545 }
546 *s++ = '.';
547 *s++ = '.';
548 *s++ = '.';
549 }
550 break;
551
552 case FF_END:
553 *t = '\0';
554 SvCUR_set(formtarget, t - SvPVX(formtarget));
555 FmLINES(formtarget) += lines;
556 SP = ORIGMARK;
557 RETPUSHYES;
558 }
559 }
560}
561
562PP(pp_grepstart)
563{
4e35701f 564 djSP;
a0d0e21e
LW
565 SV *src;
566
924508f0 567 if (stack_base + *markstack_ptr == SP) {
a0d0e21e 568 (void)POPMARK;
54310121 569 if (GIMME_V == G_SCALAR)
a0d0e21e
LW
570 XPUSHs(&sv_no);
571 RETURNOP(op->op_next->op_next);
572 }
573 stack_sp = stack_base + *markstack_ptr + 1;
11343788
MB
574 pp_pushmark(ARGS); /* push dst */
575 pp_pushmark(ARGS); /* push src */
a0d0e21e
LW
576 ENTER; /* enter outer scope */
577
578 SAVETMPS;
fb54173c
MB
579#ifdef USE_THREADS
580 /* SAVE_DEFSV does *not* suffice here */
940cb80d 581 save_sptr(&THREADSV(0));
fb54173c
MB
582#else
583 SAVESPTR(GvSV(defgv));
584#endif /* USE_THREADS */
a0d0e21e
LW
585 ENTER; /* enter inner scope */
586 SAVESPTR(curpm);
587
588 src = stack_base[*markstack_ptr];
589 SvTEMP_off(src);
54b9620d 590 DEFSV = src;
a0d0e21e
LW
591
592 PUTBACK;
593 if (op->op_type == OP_MAPSTART)
11343788 594 pp_pushmark(ARGS); /* push top */
a0d0e21e
LW
595 return ((LOGOP*)op->op_next)->op_other;
596}
597
598PP(pp_mapstart)
599{
600 DIE("panic: mapstart"); /* uses grepstart */
601}
602
603PP(pp_mapwhile)
604{
4e35701f 605 djSP;
924508f0 606 I32 diff = (SP - stack_base) - *markstack_ptr;
a0d0e21e
LW
607 I32 count;
608 I32 shift;
609 SV** src;
610 SV** dst;
611
612 ++markstack_ptr[-1];
613 if (diff) {
614 if (diff > markstack_ptr[-1] - markstack_ptr[-2]) {
615 shift = diff - (markstack_ptr[-1] - markstack_ptr[-2]);
924508f0 616 count = (SP - stack_base) - markstack_ptr[-1] + 2;
a0d0e21e 617
924508f0
GS
618 EXTEND(SP,shift);
619 src = SP;
620 dst = (SP += shift);
a0d0e21e
LW
621 markstack_ptr[-1] += shift;
622 *markstack_ptr += shift;
623 while (--count)
624 *dst-- = *src--;
625 }
626 dst = stack_base + (markstack_ptr[-2] += diff) - 1;
627 ++diff;
628 while (--diff)
629 *dst-- = SvTEMP(TOPs) ? POPs : sv_mortalcopy(POPs);
630 }
631 LEAVE; /* exit inner scope */
632
633 /* All done yet? */
634 if (markstack_ptr[-1] > *markstack_ptr) {
635 I32 items;
54310121 636 I32 gimme = GIMME_V;
a0d0e21e
LW
637
638 (void)POPMARK; /* pop top */
639 LEAVE; /* exit outer scope */
640 (void)POPMARK; /* pop src */
641 items = --*markstack_ptr - markstack_ptr[-1];
642 (void)POPMARK; /* pop dst */
643 SP = stack_base + POPMARK; /* pop original mark */
54310121 644 if (gimme == G_SCALAR) {
a0d0e21e
LW
645 dTARGET;
646 XPUSHi(items);
a0d0e21e 647 }
54310121
PP
648 else if (gimme == G_ARRAY)
649 SP += items;
a0d0e21e
LW
650 RETURN;
651 }
652 else {
653 SV *src;
654
655 ENTER; /* enter inner scope */
656 SAVESPTR(curpm);
657
658 src = stack_base[markstack_ptr[-1]];
659 SvTEMP_off(src);
54b9620d 660 DEFSV = src;
a0d0e21e
LW
661
662 RETURNOP(cLOGOP->op_other);
663 }
664}
665
a0d0e21e
LW
666PP(pp_sort)
667{
4e35701f 668 djSP; dMARK; dORIGMARK;
a0d0e21e
LW
669 register SV **up;
670 SV **myorigmark = ORIGMARK;
671 register I32 max;
672 HV *stash;
673 GV *gv;
674 CV *cv;
675 I32 gimme = GIMME;
676 OP* nextop = op->op_next;
677
678 if (gimme != G_ARRAY) {
679 SP = MARK;
680 RETPUSHUNDEF;
681 }
682
d0abe6c5
GS
683 ENTER;
684 SAVEPPTR(sortcop);
a0d0e21e 685 if (op->op_flags & OPf_STACKED) {
a0d0e21e
LW
686 if (op->op_flags & OPf_SPECIAL) {
687 OP *kid = cLISTOP->op_first->op_sibling; /* pass pushmark */
688 kid = kUNOP->op_first; /* pass rv2gv */
689 kid = kUNOP->op_first; /* pass leave */
690 sortcop = kid->op_next;
691 stash = curcop->cop_stash;
692 }
693 else {
694 cv = sv_2cv(*++MARK, &stash, &gv, 0);
695 if (!(cv && CvROOT(cv))) {
696 if (gv) {
697 SV *tmpstr = sv_newmortal();
e5cf08de 698 gv_efullname3(tmpstr, gv, Nullch);
a0d0e21e
LW
699 if (cv && CvXSUB(cv))
700 DIE("Xsub \"%s\" called in sort", SvPVX(tmpstr));
701 DIE("Undefined sort subroutine \"%s\" called",
702 SvPVX(tmpstr));
703 }
704 if (cv) {
705 if (CvXSUB(cv))
706 DIE("Xsub called in sort");
707 DIE("Undefined subroutine in sort");
708 }
709 DIE("Not a CODE reference in sort");
710 }
711 sortcop = CvSTART(cv);
712 SAVESPTR(CvROOT(cv)->op_ppaddr);
713 CvROOT(cv)->op_ppaddr = ppaddr[OP_NULL];
b3933176 714
a0d0e21e
LW
715 SAVESPTR(curpad);
716 curpad = AvARRAY((AV*)AvARRAY(CvPADLIST(cv))[1]);
717 }
718 }
719 else {
720 sortcop = Nullop;
721 stash = curcop->cop_stash;
722 }
723
724 up = myorigmark + 1;
725 while (MARK < SP) { /* This may or may not shift down one here. */
726 /*SUPPRESS 560*/
727 if (*up = *++MARK) { /* Weed out nulls. */
9f8d30d5
CS
728 SvTEMP_off(*up);
729 if (!sortcop && !SvPOK(*up))
a0d0e21e 730 (void)sv_2pv(*up, &na);
a0d0e21e
LW
731 up++;
732 }
733 }
734 max = --up - myorigmark;
735 if (sortcop) {
736 if (max > 1) {
c09156bb 737 PERL_CONTEXT *cx;
a0d0e21e 738 SV** newsp;
54310121 739 bool oldcatch = CATCH_GET;
a0d0e21e
LW
740
741 SAVETMPS;
462e5cf6 742 SAVEOP();
a0d0e21e 743
54310121 744 CATCH_SET(TRUE);
e788e7d3 745 PUSHSTACKi(PERLSI_SORT);
a0d0e21e
LW
746 if (sortstash != stash) {
747 firstgv = gv_fetchpv("a", TRUE, SVt_PV);
748 secondgv = gv_fetchpv("b", TRUE, SVt_PV);
749 sortstash = stash;
750 }
751
752 SAVESPTR(GvSV(firstgv));
753 SAVESPTR(GvSV(secondgv));
b3933176 754
0a753a76 755 PUSHBLOCK(cx, CXt_NULL, stack_base);
b3933176
CS
756 if (!(op->op_flags & OPf_SPECIAL)) {
757 bool hasargs = FALSE;
758 cx->cx_type = CXt_SUB;
759 cx->blk_gimme = G_SCALAR;
760 PUSHSUB(cx);
761 if (!CvDEPTH(cv))
3e3baf6d 762 (void)SvREFCNT_inc(cv); /* in preparation for POPSUB */
b3933176 763 }
a0d0e21e 764 sortcxix = cxstack_ix;
ac4c12e7 765 qsortsv((myorigmark+1), max, FUNC_NAME_TO_PTR(sortcv));
a0d0e21e
LW
766
767 POPBLOCK(cx,curpm);
d3acc0f7 768 POPSTACK;
54310121 769 CATCH_SET(oldcatch);
a0d0e21e 770 }
a0d0e21e
LW
771 }
772 else {
773 if (max > 1) {
774 MEXTEND(SP, 20); /* Can't afford stack realloc on signal. */
745d3a65 775 qsortsv(ORIGMARK+1, max,
ac4c12e7
GS
776 (op->op_private & OPpLOCALE)
777 ? FUNC_NAME_TO_PTR(sv_cmp_locale)
778 : FUNC_NAME_TO_PTR(sv_cmp));
a0d0e21e
LW
779 }
780 }
d0abe6c5 781 LEAVE;
a0d0e21e
LW
782 stack_sp = ORIGMARK + max;
783 return nextop;
784}
785
786/* Range stuff. */
787
788PP(pp_range)
789{
790 if (GIMME == G_ARRAY)
791 return cCONDOP->op_true;
792 return SvTRUEx(PAD_SV(op->op_targ)) ? cCONDOP->op_false : cCONDOP->op_true;
793}
794
795PP(pp_flip)
796{
4e35701f 797 djSP;
a0d0e21e
LW
798
799 if (GIMME == G_ARRAY) {
800 RETURNOP(((CONDOP*)cUNOP->op_first)->op_false);
801 }
802 else {
803 dTOPss;
804 SV *targ = PAD_SV(op->op_targ);
805
806 if ((op->op_private & OPpFLIP_LINENUM)
5f6c9cf6 807 ? (last_in_gv && SvIV(sv) == (IV)IoLINES(GvIOp(last_in_gv)))
a0d0e21e
LW
808 : SvTRUE(sv) ) {
809 sv_setiv(PAD_SV(cUNOP->op_first->op_targ), 1);
810 if (op->op_flags & OPf_SPECIAL) {
811 sv_setiv(targ, 1);
3e3baf6d 812 SETs(targ);
a0d0e21e
LW
813 RETURN;
814 }
815 else {
816 sv_setiv(targ, 0);
924508f0 817 SP--;
a0d0e21e
LW
818 RETURNOP(((CONDOP*)cUNOP->op_first)->op_false);
819 }
820 }
821 sv_setpv(TARG, "");
822 SETs(targ);
823 RETURN;
824 }
825}
826
827PP(pp_flop)
828{
4e35701f 829 djSP;
a0d0e21e
LW
830
831 if (GIMME == G_ARRAY) {
832 dPOPPOPssrl;
833 register I32 i;
834 register SV *sv;
835 I32 max;
836
4633a7c4 837 if (SvNIOKp(left) || !SvPOKp(left) ||
bbce6d69
PP
838 (looks_like_number(left) && *SvPVX(left) != '0') )
839 {
89ea2908
GA
840 if (SvNV(left) < IV_MIN || SvNV(right) >= IV_MAX)
841 croak("Range iterator outside integer range");
a0d0e21e
LW
842 i = SvIV(left);
843 max = SvIV(right);
bbce6d69
PP
844 if (max >= i) {
845 EXTEND_MORTAL(max - i + 1);
a0d0e21e 846 EXTEND(SP, max - i + 1);
bbce6d69 847 }
a0d0e21e 848 while (i <= max) {
bbce6d69 849 sv = sv_2mortal(newSViv(i++));
a0d0e21e
LW
850 PUSHs(sv);
851 }
852 }
853 else {
854 SV *final = sv_mortalcopy(right);
855 STRLEN len;
856 char *tmps = SvPV(final, len);
857
858 sv = sv_mortalcopy(left);
781449de 859 SvPV_force(sv,na);
89ea2908 860 while (!SvNIOKp(sv) && SvCUR(sv) <= len) {
a0d0e21e 861 XPUSHs(sv);
89ea2908
GA
862 if (strEQ(SvPVX(sv),tmps))
863 break;
a0d0e21e
LW
864 sv = sv_2mortal(newSVsv(sv));
865 sv_inc(sv);
866 }
a0d0e21e
LW
867 }
868 }
869 else {
870 dTOPss;
871 SV *targ = PAD_SV(cUNOP->op_first->op_targ);
872 sv_inc(targ);
873 if ((op->op_private & OPpFLIP_LINENUM)
5f6c9cf6 874 ? (last_in_gv && SvIV(sv) == (IV)IoLINES(GvIOp(last_in_gv)))
a0d0e21e
LW
875 : SvTRUE(sv) ) {
876 sv_setiv(PAD_SV(((UNOP*)cUNOP->op_first)->op_first->op_targ), 0);
877 sv_catpv(targ, "E0");
878 }
879 SETs(targ);
880 }
881
882 RETURN;
883}
884
885/* Control. */
886
76e3520e 887STATIC I32
8ac85365 888dopoptolabel(char *label)
a0d0e21e 889{
11343788 890 dTHR;
a0d0e21e 891 register I32 i;
c09156bb 892 register PERL_CONTEXT *cx;
a0d0e21e
LW
893
894 for (i = cxstack_ix; i >= 0; i--) {
895 cx = &cxstack[i];
896 switch (cx->cx_type) {
897 case CXt_SUBST:
898 if (dowarn)
899 warn("Exiting substitution via %s", op_name[op->op_type]);
900 break;
901 case CXt_SUB:
902 if (dowarn)
903 warn("Exiting subroutine via %s", op_name[op->op_type]);
904 break;
905 case CXt_EVAL:
906 if (dowarn)
907 warn("Exiting eval via %s", op_name[op->op_type]);
908 break;
0a753a76
PP
909 case CXt_NULL:
910 if (dowarn)
911 warn("Exiting pseudo-block via %s", op_name[op->op_type]);
912 return -1;
a0d0e21e
LW
913 case CXt_LOOP:
914 if (!cx->blk_loop.label ||
915 strNE(label, cx->blk_loop.label) ) {
68dc0745
PP
916 DEBUG_l(deb("(Skipping label #%ld %s)\n",
917 (long)i, cx->blk_loop.label));
a0d0e21e
LW
918 continue;
919 }
68dc0745 920 DEBUG_l( deb("(Found label #%ld %s)\n", (long)i, label));
a0d0e21e
LW
921 return i;
922 }
923 }
924 return i;
925}
926
e50aee73 927I32
8ac85365 928dowantarray(void)
e50aee73 929{
54310121
PP
930 I32 gimme = block_gimme();
931 return (gimme == G_VOID) ? G_SCALAR : gimme;
932}
933
934I32
8ac85365 935block_gimme(void)
54310121 936{
11343788 937 dTHR;
e50aee73
AD
938 I32 cxix;
939
940 cxix = dopoptosub(cxstack_ix);
941 if (cxix < 0)
46fc3d4c 942 return G_VOID;
e50aee73 943
54310121 944 switch (cxstack[cxix].blk_gimme) {
d2719217
GS
945 case G_VOID:
946 return G_VOID;
54310121 947 case G_SCALAR:
e50aee73 948 return G_SCALAR;
54310121
PP
949 case G_ARRAY:
950 return G_ARRAY;
951 default:
952 croak("panic: bad gimme: %d\n", cxstack[cxix].blk_gimme);
d2719217
GS
953 /* NOTREACHED */
954 return 0;
54310121 955 }
e50aee73
AD
956}
957
76e3520e 958STATIC I32
8ac85365 959dopoptosub(I32 startingblock)
a0d0e21e 960{
11343788 961 dTHR;
2c375eb9
GS
962 return dopoptosub_at(cxstack, startingblock);
963}
964
965STATIC I32
966dopoptosub_at(PERL_CONTEXT *cxstk, I32 startingblock)
967{
968 dTHR;
a0d0e21e 969 I32 i;
c09156bb 970 register PERL_CONTEXT *cx;
a0d0e21e 971 for (i = startingblock; i >= 0; i--) {
2c375eb9 972 cx = &cxstk[i];
a0d0e21e
LW
973 switch (cx->cx_type) {
974 default:
975 continue;
976 case CXt_EVAL:
977 case CXt_SUB:
68dc0745 978 DEBUG_l( deb("(Found sub #%ld)\n", (long)i));
a0d0e21e
LW
979 return i;
980 }
981 }
982 return i;
983}
984
76e3520e 985STATIC I32
8ac85365 986dopoptoeval(I32 startingblock)
a0d0e21e 987{
11343788 988 dTHR;
a0d0e21e 989 I32 i;
c09156bb 990 register PERL_CONTEXT *cx;
a0d0e21e
LW
991 for (i = startingblock; i >= 0; i--) {
992 cx = &cxstack[i];
993 switch (cx->cx_type) {
994 default:
995 continue;
996 case CXt_EVAL:
68dc0745 997 DEBUG_l( deb("(Found eval #%ld)\n", (long)i));
a0d0e21e
LW
998 return i;
999 }
1000 }
1001 return i;
1002}
1003
76e3520e 1004STATIC I32
8ac85365 1005dopoptoloop(I32 startingblock)
a0d0e21e 1006{
11343788 1007 dTHR;
a0d0e21e 1008 I32 i;
c09156bb 1009 register PERL_CONTEXT *cx;
a0d0e21e
LW
1010 for (i = startingblock; i >= 0; i--) {
1011 cx = &cxstack[i];
1012 switch (cx->cx_type) {
1013 case CXt_SUBST:
1014 if (dowarn)
5f05dabc 1015 warn("Exiting substitution via %s", op_name[op->op_type]);
a0d0e21e
LW
1016 break;
1017 case CXt_SUB:
1018 if (dowarn)
1019 warn("Exiting subroutine via %s", op_name[op->op_type]);
1020 break;
1021 case CXt_EVAL:
1022 if (dowarn)
1023 warn("Exiting eval via %s", op_name[op->op_type]);
1024 break;
0a753a76
PP
1025 case CXt_NULL:
1026 if (dowarn)
1027 warn("Exiting pseudo-block via %s", op_name[op->op_type]);
1028 return -1;
a0d0e21e 1029 case CXt_LOOP:
68dc0745 1030 DEBUG_l( deb("(Found loop #%ld)\n", (long)i));
a0d0e21e
LW
1031 return i;
1032 }
1033 }
1034 return i;
1035}
1036
1037void
8ac85365 1038dounwind(I32 cxix)
a0d0e21e 1039{
11343788 1040 dTHR;
c09156bb 1041 register PERL_CONTEXT *cx;
a0d0e21e
LW
1042 SV **newsp;
1043 I32 optype;
1044
1045 while (cxstack_ix > cxix) {
c90c0ff4
PP
1046 cx = &cxstack[cxstack_ix];
1047 DEBUG_l(PerlIO_printf(Perl_debug_log, "Unwinding block %ld, type %s\n",
301d9039 1048 (long) cxstack_ix, block_type[cx->cx_type]));
a0d0e21e
LW
1049 /* Note: we don't need to restore the base context info till the end. */
1050 switch (cx->cx_type) {
c90c0ff4
PP
1051 case CXt_SUBST:
1052 POPSUBST(cx);
1053 continue; /* not break */
a0d0e21e
LW
1054 case CXt_SUB:
1055 POPSUB(cx);
1056 break;
1057 case CXt_EVAL:
1058 POPEVAL(cx);
1059 break;
1060 case CXt_LOOP:
1061 POPLOOP(cx);
1062 break;
0a753a76 1063 case CXt_NULL:
a0d0e21e
LW
1064 break;
1065 }
c90c0ff4 1066 cxstack_ix--;
a0d0e21e
LW
1067 }
1068}
1069
a0d0e21e 1070OP *
8ac85365 1071die_where(char *message)
a0d0e21e 1072{
e336de0d 1073 dSP;
a0d0e21e
LW
1074 if (in_eval) {
1075 I32 cxix;
c09156bb 1076 register PERL_CONTEXT *cx;
a0d0e21e
LW
1077 I32 gimme;
1078 SV **newsp;
1079
4e6ea2c3
GS
1080 if (message) {
1081 if (in_eval & 4) {
1082 SV **svp;
1083 STRLEN klen = strlen(message);
1084
1085 svp = hv_fetch(ERRHV, message, klen, TRUE);
1086 if (svp) {
1087 if (!SvIOK(*svp)) {
1088 static char prefix[] = "\t(in cleanup) ";
1089 SV *err = ERRSV;
1090 sv_upgrade(*svp, SVt_IV);
1091 (void)SvIOK_only(*svp);
1092 if (!SvPOK(err))
1093 sv_setpv(err,"");
1094 SvGROW(err, SvCUR(err)+sizeof(prefix)+klen);
1095 sv_catpvn(err, prefix, sizeof(prefix)-1);
1096 sv_catpvn(err, message, klen);
1097 }
1098 sv_inc(*svp);
4633a7c4 1099 }
4633a7c4 1100 }
4e6ea2c3
GS
1101 else
1102 sv_setpv(ERRSV, message);
4633a7c4
LW
1103 }
1104 else
4e6ea2c3
GS
1105 message = SvPVx(ERRSV, na);
1106
bac4b2ad
GS
1107 while ((cxix = dopoptoeval(cxstack_ix)) < 0 && curstackinfo->si_prev) {
1108 dounwind(-1);
d3acc0f7 1109 POPSTACK;
bac4b2ad 1110 }
e336de0d 1111
a0d0e21e
LW
1112 if (cxix >= 0) {
1113 I32 optype;
1114
1115 if (cxix < cxstack_ix)
1116 dounwind(cxix);
1117
1118 POPBLOCK(cx,curpm);
1119 if (cx->cx_type != CXt_EVAL) {
760ac839 1120 PerlIO_printf(PerlIO_stderr(), "panic: die %s", message);
a0d0e21e
LW
1121 my_exit(1);
1122 }
1123 POPEVAL(cx);
1124
1125 if (gimme == G_SCALAR)
1126 *++newsp = &sv_undef;
1127 stack_sp = newsp;
1128
1129 LEAVE;
748a9306 1130
7a2e2cd6 1131 if (optype == OP_REQUIRE) {
38a03e6e 1132 char* msg = SvPVx(ERRSV, na);
7a2e2cd6
PP
1133 DIE("%s", *msg ? msg : "Compilation failed in require");
1134 }
a0d0e21e
LW
1135 return pop_return();
1136 }
1137 }
760ac839
LW
1138 PerlIO_printf(PerlIO_stderr(), "%s",message);
1139 PerlIO_flush(PerlIO_stderr());
f86702cc
PP
1140 my_failure_exit();
1141 /* NOTREACHED */
a0d0e21e
LW
1142 return 0;
1143}
1144
1145PP(pp_xor)
1146{
4e35701f 1147 djSP; dPOPTOPssrl;
a0d0e21e
LW
1148 if (SvTRUE(left) != SvTRUE(right))
1149 RETSETYES;
1150 else
1151 RETSETNO;
1152}
1153
1154PP(pp_andassign)
1155{
4e35701f 1156 djSP;
a0d0e21e
LW
1157 if (!SvTRUE(TOPs))
1158 RETURN;
1159 else
1160 RETURNOP(cLOGOP->op_other);
1161}
1162
1163PP(pp_orassign)
1164{
4e35701f 1165 djSP;
a0d0e21e
LW
1166 if (SvTRUE(TOPs))
1167 RETURN;
1168 else
1169 RETURNOP(cLOGOP->op_other);
1170}
1171
a0d0e21e
LW
1172PP(pp_caller)
1173{
4e35701f 1174 djSP;
a0d0e21e 1175 register I32 cxix = dopoptosub(cxstack_ix);
c09156bb 1176 register PERL_CONTEXT *cx;
2c375eb9
GS
1177 register PERL_CONTEXT *ccstack = cxstack;
1178 PERL_SI *top_si = curstackinfo;
a0d0e21e 1179 I32 dbcxix;
54310121 1180 I32 gimme;
49d8d3a1 1181 HV *hv;
a0d0e21e
LW
1182 SV *sv;
1183 I32 count = 0;
1184
1185 if (MAXARG)
1186 count = POPi;
1187 EXTEND(SP, 6);
1188 for (;;) {
2c375eb9
GS
1189 /* we may be in a higher stacklevel, so dig down deeper */
1190 while (cxix < 0 && top_si->si_type != PERLSI_MAIN) {
1191 top_si = top_si->si_prev;
1192 ccstack = top_si->si_cxstack;
1193 cxix = dopoptosub_at(ccstack, top_si->si_cxix);
1194 }
a0d0e21e
LW
1195 if (cxix < 0) {
1196 if (GIMME != G_ARRAY)
1197 RETPUSHUNDEF;
1198 RETURN;
1199 }
1200 if (DBsub && cxix >= 0 &&
2c375eb9 1201 ccstack[cxix].blk_sub.cv == GvCV(DBsub))
a0d0e21e
LW
1202 count++;
1203 if (!count--)
1204 break;
2c375eb9 1205 cxix = dopoptosub_at(ccstack, cxix - 1);
a0d0e21e 1206 }
2c375eb9
GS
1207
1208 cx = &ccstack[cxix];
1209 if (ccstack[cxix].cx_type == CXt_SUB) {
1210 dbcxix = dopoptosub_at(ccstack, cxix - 1);
1211 /* We expect that ccstack[dbcxix] is CXt_SUB, anyway, the
06a5b730 1212 field below is defined for any cx. */
2c375eb9
GS
1213 if (DBsub && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(DBsub))
1214 cx = &ccstack[dbcxix];
06a5b730
PP
1215 }
1216
a0d0e21e 1217 if (GIMME != G_ARRAY) {
49d8d3a1
MB
1218 hv = cx->blk_oldcop->cop_stash;
1219 if (!hv)
1220 PUSHs(&sv_undef);
1221 else {
1222 dTARGET;
1223 sv_setpv(TARG, HvNAME(hv));
1224 PUSHs(TARG);
1225 }
a0d0e21e
LW
1226 RETURN;
1227 }
a0d0e21e 1228
49d8d3a1
MB
1229 hv = cx->blk_oldcop->cop_stash;
1230 if (!hv)
1231 PUSHs(&sv_undef);
1232 else
1233 PUSHs(sv_2mortal(newSVpv(HvNAME(hv), 0)));
a0d0e21e
LW
1234 PUSHs(sv_2mortal(newSVpv(SvPVX(GvSV(cx->blk_oldcop->cop_filegv)), 0)));
1235 PUSHs(sv_2mortal(newSViv((I32)cx->blk_oldcop->cop_line)));
1236 if (!MAXARG)
1237 RETURN;
2c375eb9 1238 if (cx->cx_type == CXt_SUB) { /* So is ccstack[dbcxix]. */
a0d0e21e 1239 sv = NEWSV(49, 0);
2c375eb9 1240 gv_efullname3(sv, CvGV(ccstack[cxix].blk_sub.cv), Nullch);
a0d0e21e
LW
1241 PUSHs(sv_2mortal(sv));
1242 PUSHs(sv_2mortal(newSViv((I32)cx->blk_sub.hasargs)));
1243 }
1244 else {
1245 PUSHs(sv_2mortal(newSVpv("(eval)",0)));
1246 PUSHs(sv_2mortal(newSViv(0)));
1247 }
54310121
PP
1248 gimme = (I32)cx->blk_gimme;
1249 if (gimme == G_VOID)
1250 PUSHs(&sv_undef);
1251 else
1252 PUSHs(sv_2mortal(newSViv(gimme & G_ARRAY)));
4633a7c4 1253 if (cx->cx_type == CXt_EVAL) {
06a5b730 1254 if (cx->blk_eval.old_op_type == OP_ENTEREVAL) {
4633a7c4 1255 PUSHs(cx->blk_eval.cur_text);
06a5b730
PP
1256 PUSHs(&sv_no);
1257 }
1258 else if (cx->blk_eval.old_name) { /* Try blocks have old_name == 0. */
1259 /* Require, put the name. */
1260 PUSHs(sv_2mortal(newSVpv(cx->blk_eval.old_name, 0)));
1261 PUSHs(&sv_yes);
1262 }
4633a7c4
LW
1263 }
1264 else if (cx->cx_type == CXt_SUB &&
1265 cx->blk_sub.hasargs &&
1266 curcop->cop_stash == debstash)
1267 {
a0d0e21e
LW
1268 AV *ary = cx->blk_sub.argarray;
1269 int off = AvARRAY(ary) - AvALLOC(ary);
1270
1271 if (!dbargs) {
1272 GV* tmpgv;
1273 dbargs = GvAV(gv_AVadd(tmpgv = gv_fetchpv("DB::args", TRUE,
1274 SVt_PVAV)));
a5f75d66 1275 GvMULTI_on(tmpgv);
a0d0e21e
LW
1276 AvREAL_off(dbargs); /* XXX Should be REIFY */
1277 }
1278
93965878
NIS
1279 if (AvMAX(dbargs) < AvFILLp(ary) + off)
1280 av_extend(dbargs, AvFILLp(ary) + off);
1281 Copy(AvALLOC(ary), AvARRAY(dbargs), AvFILLp(ary) + 1 + off, SV*);
1282 AvFILLp(dbargs) = AvFILLp(ary) + off;
a0d0e21e
LW
1283 }
1284 RETURN;
1285}
1286
6b6eec5b 1287STATIC I32
745d3a65 1288sortcv(SV *a, SV *b)
a0d0e21e 1289{
11343788 1290 dTHR;
748a9306 1291 I32 oldsaveix = savestack_ix;
a0d0e21e
LW
1292 I32 oldscopeix = scopestack_ix;
1293 I32 result;
745d3a65
HM
1294 GvSV(firstgv) = a;
1295 GvSV(secondgv) = b;
a0d0e21e
LW
1296 stack_sp = stack_base;
1297 op = sortcop;
76e3520e 1298 CALLRUNOPS();
a0d0e21e
LW
1299 if (stack_sp != stack_base + 1)
1300 croak("Sort subroutine didn't return single value");
748a9306 1301 if (!SvNIOKp(*stack_sp))
a0d0e21e
LW
1302 croak("Sort subroutine didn't return a numeric value");
1303 result = SvIV(*stack_sp);
1304 while (scopestack_ix > oldscopeix) {
1305 LEAVE;
1306 }
748a9306 1307 leave_scope(oldsaveix);
a0d0e21e
LW
1308 return result;
1309}
1310
a0d0e21e
LW
1311PP(pp_reset)
1312{
4e35701f 1313 djSP;
a0d0e21e
LW
1314 char *tmps;
1315
1316 if (MAXARG < 1)
1317 tmps = "";
1318 else
1319 tmps = POPp;
1320 sv_reset(tmps, curcop->cop_stash);
1321 PUSHs(&sv_yes);
1322 RETURN;
1323}
1324
1325PP(pp_lineseq)
1326{
1327 return NORMAL;
1328}
1329
1330PP(pp_dbstate)
1331{
1332 curcop = (COP*)op;
1333 TAINT_NOT; /* Each statement is presumed innocent */
1334 stack_sp = stack_base + cxstack[cxstack_ix].blk_oldsp;
1335 FREETMPS;
1336
1337 if (op->op_private || SvIV(DBsingle) || SvIV(DBsignal) || SvIV(DBtrace))
1338 {
924508f0 1339 djSP;
a0d0e21e 1340 register CV *cv;
c09156bb 1341 register PERL_CONTEXT *cx;
748a9306 1342 I32 gimme = G_ARRAY;
a0d0e21e
LW
1343 I32 hasargs;
1344 GV *gv;
1345
a0d0e21e
LW
1346 gv = DBgv;
1347 cv = GvCV(gv);
a0d0e21e
LW
1348 if (!cv)
1349 DIE("No DB::DB routine defined");
1350
06a5b730 1351 if (CvDEPTH(cv) >= 1 && !(debug & (1<<30))) /* don't do recursive DB::DB call */
a0d0e21e 1352 return NORMAL;
748a9306 1353
4633a7c4
LW
1354 ENTER;
1355 SAVETMPS;
1356
748a9306 1357 SAVEI32(debug);
55497cff 1358 SAVESTACK_POS();
748a9306
LW
1359 debug = 0;
1360 hasargs = 0;
924508f0 1361 SPAGAIN;
748a9306 1362
a0d0e21e 1363 push_return(op->op_next);
924508f0 1364 PUSHBLOCK(cx, CXt_SUB, SP);
a0d0e21e
LW
1365 PUSHSUB(cx);
1366 CvDEPTH(cv)++;
1367 (void)SvREFCNT_inc(cv);
1368 SAVESPTR(curpad);
1369 curpad = AvARRAY((AV*)*av_fetch(CvPADLIST(cv),1,FALSE));
1370 RETURNOP(CvSTART(cv));
1371 }
1372 else
1373 return NORMAL;
1374}
1375
1376PP(pp_scope)
1377{
1378 return NORMAL;
1379}
1380
1381PP(pp_enteriter)
1382{
4e35701f 1383 djSP; dMARK;
c09156bb 1384 register PERL_CONTEXT *cx;
54310121 1385 I32 gimme = GIMME_V;
a0d0e21e
LW
1386 SV **svp;
1387
4633a7c4
LW
1388 ENTER;
1389 SAVETMPS;
1390
54b9620d
MB
1391#ifdef USE_THREADS
1392 if (op->op_flags & OPf_SPECIAL)
1393 svp = save_threadsv(op->op_targ); /* per-thread variable */
a0d0e21e 1394 else
54b9620d
MB
1395#endif /* USE_THREADS */
1396 if (op->op_targ) {
1397 svp = &curpad[op->op_targ]; /* "my" variable */
1398 SAVESPTR(*svp);
1399 }
1400 else {
301d9039
GS
1401 GV *gv = (GV*)POPs;
1402 (void)save_scalar(gv);
1403 svp = &GvSV(gv); /* symbol table variable */
54b9620d 1404 }
4633a7c4 1405
a0d0e21e
LW
1406 ENTER;
1407
1408 PUSHBLOCK(cx, CXt_LOOP, SP);
1409 PUSHLOOP(cx, svp, MARK);
89ea2908 1410 if (op->op_flags & OPf_STACKED) {
44a8e56a 1411 cx->blk_loop.iterary = (AV*)SvREFCNT_inc(POPs);
89ea2908
GA
1412 if (SvTYPE(cx->blk_loop.iterary) != SVt_PVAV) {
1413 dPOPss;
1414 if (SvNIOKp(sv) || !SvPOKp(sv) ||
1415 (looks_like_number(sv) && *SvPVX(sv) != '0')) {
1416 if (SvNV(sv) < IV_MIN ||
1417 SvNV((SV*)cx->blk_loop.iterary) >= IV_MAX)
1418 croak("Range iterator outside integer range");
1419 cx->blk_loop.iterix = SvIV(sv);
1420 cx->blk_loop.itermax = SvIV((SV*)cx->blk_loop.iterary);
1421 }
1422 else
1423 cx->blk_loop.iterlval = newSVsv(sv);
1424 }
1425 }
4633a7c4 1426 else {
1ce6579f 1427 cx->blk_loop.iterary = curstack;
924508f0 1428 AvFILLp(curstack) = SP - stack_base;
4633a7c4
LW
1429 cx->blk_loop.iterix = MARK - stack_base;
1430 }
a0d0e21e
LW
1431
1432 RETURN;
1433}
1434
1435PP(pp_enterloop)
1436{
4e35701f 1437 djSP;
c09156bb 1438 register PERL_CONTEXT *cx;
54310121 1439 I32 gimme = GIMME_V;
a0d0e21e
LW
1440
1441 ENTER;
1442 SAVETMPS;
1443 ENTER;
1444
1445 PUSHBLOCK(cx, CXt_LOOP, SP);
1446 PUSHLOOP(cx, 0, SP);
1447
1448 RETURN;
1449}
1450
1451PP(pp_leaveloop)
1452{
4e35701f 1453 djSP;
c09156bb 1454 register PERL_CONTEXT *cx;
f86702cc 1455 struct block_loop cxloop;
a0d0e21e
LW
1456 I32 gimme;
1457 SV **newsp;
1458 PMOP *newpm;
1459 SV **mark;
1460
1461 POPBLOCK(cx,newpm);
4fdae800 1462 mark = newsp;
f86702cc
PP
1463 POPLOOP1(cx); /* Delay POPLOOP2 until stack values are safe */
1464
a1f49e72 1465 TAINT_NOT;
54310121
PP
1466 if (gimme == G_VOID)
1467 ; /* do nothing */
1468 else if (gimme == G_SCALAR) {
1469 if (mark < SP)
1470 *++newsp = sv_mortalcopy(*SP);
1471 else
1472 *++newsp = &sv_undef;
a0d0e21e
LW
1473 }
1474 else {
a1f49e72 1475 while (mark < SP) {
a0d0e21e 1476 *++newsp = sv_mortalcopy(*++mark);
a1f49e72
CS
1477 TAINT_NOT; /* Each item is independent */
1478 }
a0d0e21e 1479 }
f86702cc
PP
1480 SP = newsp;
1481 PUTBACK;
1482
1483 POPLOOP2(); /* Stack values are safe: release loop vars ... */
1484 curpm = newpm; /* ... and pop $1 et al */
1485
a0d0e21e
LW
1486 LEAVE;
1487 LEAVE;
1488
f86702cc 1489 return NORMAL;
a0d0e21e
LW
1490}
1491
1492PP(pp_return)
1493{
4e35701f 1494 djSP; dMARK;
a0d0e21e 1495 I32 cxix;
c09156bb 1496 register PERL_CONTEXT *cx;
f86702cc
PP
1497 struct block_sub cxsub;
1498 bool popsub2 = FALSE;
a0d0e21e
LW
1499 I32 gimme;
1500 SV **newsp;
1501 PMOP *newpm;
1502 I32 optype = 0;
1503
e788e7d3 1504 if (curstackinfo->si_type == PERLSI_SORT) {
b3933176 1505 if (cxstack_ix == sortcxix || dopoptosub(cxstack_ix) <= sortcxix) {
16d20bd9
AD
1506 if (cxstack_ix > sortcxix)
1507 dounwind(sortcxix);
1ce6579f 1508 AvARRAY(curstack)[1] = *SP;
a0d0e21e
LW
1509 stack_sp = stack_base + 1;
1510 return 0;
1511 }
1512 }
1513
1514 cxix = dopoptosub(cxstack_ix);
1515 if (cxix < 0)
1516 DIE("Can't return outside a subroutine");
1517 if (cxix < cxstack_ix)
1518 dounwind(cxix);
1519
1520 POPBLOCK(cx,newpm);
1521 switch (cx->cx_type) {
1522 case CXt_SUB:
f86702cc
PP
1523 POPSUB1(cx); /* Delay POPSUB2 until stack values are safe */
1524 popsub2 = TRUE;
a0d0e21e
LW
1525 break;
1526 case CXt_EVAL:
1527 POPEVAL(cx);
748a9306
LW
1528 if (optype == OP_REQUIRE &&
1529 (MARK == SP || (gimme == G_SCALAR && !SvTRUE(*SP))) )
1530 {
54310121 1531 /* Unassume the success we assumed earlier. */
748a9306
LW
1532 char *name = cx->blk_eval.old_name;
1533 (void)hv_delete(GvHVn(incgv), name, strlen(name), G_DISCARD);
1534 DIE("%s did not return a true value", name);
1535 }
a0d0e21e
LW
1536 break;
1537 default:
1538 DIE("panic: return");
a0d0e21e
LW
1539 }
1540
a1f49e72 1541 TAINT_NOT;
a0d0e21e 1542 if (gimme == G_SCALAR) {
a29cdaf0
IZ
1543 if (MARK < SP) {
1544 if (popsub2) {
1545 if (cxsub.cv && CvDEPTH(cxsub.cv) > 1) {
1546 if (SvTEMP(TOPs)) {
1547 *++newsp = SvREFCNT_inc(*SP);
1548 FREETMPS;
1549 sv_2mortal(*newsp);
1550 } else {
1551 FREETMPS;
1552 *++newsp = sv_mortalcopy(*SP);
1553 }
1554 } else
1555 *++newsp = (SvTEMP(*SP)) ? *SP : sv_mortalcopy(*SP);
1556 } else
1557 *++newsp = sv_mortalcopy(*SP);
1558 } else
a0d0e21e 1559 *++newsp = &sv_undef;
a0d0e21e 1560 }
54310121 1561 else if (gimme == G_ARRAY) {
a1f49e72 1562 while (++MARK <= SP) {
f86702cc
PP
1563 *++newsp = (popsub2 && SvTEMP(*MARK))
1564 ? *MARK : sv_mortalcopy(*MARK);
a1f49e72
CS
1565 TAINT_NOT; /* Each item is independent */
1566 }
a0d0e21e 1567 }
a0d0e21e
LW
1568 stack_sp = newsp;
1569
f86702cc
PP
1570 /* Stack values are safe: */
1571 if (popsub2) {
1572 POPSUB2(); /* release CV and @_ ... */
1573 }
1574 curpm = newpm; /* ... and pop $1 et al */
1575
a0d0e21e
LW
1576 LEAVE;
1577 return pop_return();
1578}
1579
1580PP(pp_last)
1581{
4e35701f 1582 djSP;
a0d0e21e 1583 I32 cxix;
c09156bb 1584 register PERL_CONTEXT *cx;
f86702cc
PP
1585 struct block_loop cxloop;
1586 struct block_sub cxsub;
1587 I32 pop2 = 0;
a0d0e21e
LW
1588 I32 gimme;
1589 I32 optype;
1590 OP *nextop;
1591 SV **newsp;
1592 PMOP *newpm;
1593 SV **mark = stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e
LW
1594
1595 if (op->op_flags & OPf_SPECIAL) {
1596 cxix = dopoptoloop(cxstack_ix);
1597 if (cxix < 0)
1598 DIE("Can't \"last\" outside a block");
1599 }
1600 else {
1601 cxix = dopoptolabel(cPVOP->op_pv);
1602 if (cxix < 0)
1603 DIE("Label not found for \"last %s\"", cPVOP->op_pv);
1604 }
1605 if (cxix < cxstack_ix)
1606 dounwind(cxix);
1607
1608 POPBLOCK(cx,newpm);
1609 switch (cx->cx_type) {
1610 case CXt_LOOP:
f86702cc
PP
1611 POPLOOP1(cx); /* Delay POPLOOP2 until stack values are safe */
1612 pop2 = CXt_LOOP;
4fdae800 1613 nextop = cxloop.last_op->op_next;
a0d0e21e 1614 break;
f86702cc
PP
1615 case CXt_SUB:
1616 POPSUB1(cx); /* Delay POPSUB2 until stack values are safe */
1617 pop2 = CXt_SUB;
a0d0e21e
LW
1618 nextop = pop_return();
1619 break;
f86702cc
PP
1620 case CXt_EVAL:
1621 POPEVAL(cx);
a0d0e21e
LW
1622 nextop = pop_return();
1623 break;
1624 default:
1625 DIE("panic: last");
a0d0e21e
LW
1626 }
1627
a1f49e72 1628 TAINT_NOT;
a0d0e21e 1629 if (gimme == G_SCALAR) {
f86702cc
PP
1630 if (MARK < SP)
1631 *++newsp = ((pop2 == CXt_SUB) && SvTEMP(*SP))
1632 ? *SP : sv_mortalcopy(*SP);
a0d0e21e
LW
1633 else
1634 *++newsp = &sv_undef;
1635 }
54310121 1636 else if (gimme == G_ARRAY) {
a1f49e72 1637 while (++MARK <= SP) {
f86702cc
PP
1638 *++newsp = ((pop2 == CXt_SUB) && SvTEMP(*MARK))
1639 ? *MARK : sv_mortalcopy(*MARK);
a1f49e72
CS
1640 TAINT_NOT; /* Each item is independent */
1641 }
f86702cc
PP
1642 }
1643 SP = newsp;
1644 PUTBACK;
1645
1646 /* Stack values are safe: */
1647 switch (pop2) {
1648 case CXt_LOOP:
1649 POPLOOP2(); /* release loop vars ... */
4fdae800 1650 LEAVE;
f86702cc
PP
1651 break;
1652 case CXt_SUB:
1653 POPSUB2(); /* release CV and @_ ... */
1654 break;
a0d0e21e 1655 }
f86702cc 1656 curpm = newpm; /* ... and pop $1 et al */
a0d0e21e
LW
1657
1658 LEAVE;
f86702cc 1659 return nextop;
a0d0e21e
LW
1660}
1661
1662PP(pp_next)
1663{
1664 I32 cxix;
c09156bb 1665 register PERL_CONTEXT *cx;
a0d0e21e
LW
1666 I32 oldsave;
1667
1668 if (op->op_flags & OPf_SPECIAL) {
1669 cxix = dopoptoloop(cxstack_ix);
1670 if (cxix < 0)
1671 DIE("Can't \"next\" outside a block");
1672 }
1673 else {
1674 cxix = dopoptolabel(cPVOP->op_pv);
1675 if (cxix < 0)
1676 DIE("Label not found for \"next %s\"", cPVOP->op_pv);
1677 }
1678 if (cxix < cxstack_ix)
1679 dounwind(cxix);
1680
1681 TOPBLOCK(cx);
1682 oldsave = scopestack[scopestack_ix - 1];
1683 LEAVE_SCOPE(oldsave);
1684 return cx->blk_loop.next_op;
1685}
1686
1687PP(pp_redo)
1688{
1689 I32 cxix;
c09156bb 1690 register PERL_CONTEXT *cx;
a0d0e21e
LW
1691 I32 oldsave;
1692
1693 if (op->op_flags & OPf_SPECIAL) {
1694 cxix = dopoptoloop(cxstack_ix);
1695 if (cxix < 0)
1696 DIE("Can't \"redo\" outside a block");
1697 }
1698 else {
1699 cxix = dopoptolabel(cPVOP->op_pv);
1700 if (cxix < 0)
1701 DIE("Label not found for \"redo %s\"", cPVOP->op_pv);
1702 }
1703 if (cxix < cxstack_ix)
1704 dounwind(cxix);
1705
1706 TOPBLOCK(cx);
1707 oldsave = scopestack[scopestack_ix - 1];
1708 LEAVE_SCOPE(oldsave);
1709 return cx->blk_loop.redo_op;
1710}
1711
0824fdcb 1712STATIC OP *
8ac85365 1713dofindlabel(OP *o, char *label, OP **opstack, OP **oplimit)
a0d0e21e
LW
1714{
1715 OP *kid;
1716 OP **ops = opstack;
fc36a67e 1717 static char too_deep[] = "Target of goto is too deeply nested";
a0d0e21e 1718
fc36a67e
PP
1719 if (ops >= oplimit)
1720 croak(too_deep);
11343788
MB
1721 if (o->op_type == OP_LEAVE ||
1722 o->op_type == OP_SCOPE ||
1723 o->op_type == OP_LEAVELOOP ||
1724 o->op_type == OP_LEAVETRY)
fc36a67e 1725 {
5dc0d613 1726 *ops++ = cUNOPo->op_first;
fc36a67e
PP
1727 if (ops >= oplimit)
1728 croak(too_deep);
1729 }
a0d0e21e 1730 *ops = 0;
11343788 1731 if (o->op_flags & OPf_KIDS) {
5c0ca799 1732 dTHR;
a0d0e21e 1733 /* First try all the kids at this level, since that's likeliest. */
11343788 1734 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
a0d0e21e
LW
1735 if ((kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) &&
1736 kCOP->cop_label && strEQ(kCOP->cop_label, label))
1737 return kid;
1738 }
11343788 1739 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
a0d0e21e
LW
1740 if (kid == lastgotoprobe)
1741 continue;
fc36a67e
PP
1742 if ((kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) &&
1743 (ops == opstack ||
1744 (ops[-1]->op_type != OP_NEXTSTATE &&
1745 ops[-1]->op_type != OP_DBSTATE)))
1746 *ops++ = kid;
5dc0d613 1747 if (o = dofindlabel(kid, label, ops, oplimit))
11343788 1748 return o;
a0d0e21e
LW
1749 }
1750 }
1751 *ops = 0;
1752 return 0;
1753}
1754
1755PP(pp_dump)
1756{
1757 return pp_goto(ARGS);
1758 /*NOTREACHED*/
1759}
1760
1761PP(pp_goto)
1762{
4e35701f 1763 djSP;
a0d0e21e
LW
1764 OP *retop = 0;
1765 I32 ix;
c09156bb 1766 register PERL_CONTEXT *cx;
fc36a67e
PP
1767#define GOTO_DEPTH 64
1768 OP *enterops[GOTO_DEPTH];
a0d0e21e
LW
1769 char *label;
1770 int do_dump = (op->op_type == OP_DUMP);
1771
1772 label = 0;
1773 if (op->op_flags & OPf_STACKED) {
1774 SV *sv = POPs;
1775
1776 /* This egregious kludge implements goto &subroutine */
1777 if (SvROK(sv) && SvTYPE(SvRV(sv)) == SVt_PVCV) {
1778 I32 cxix;
c09156bb 1779 register PERL_CONTEXT *cx;
a0d0e21e
LW
1780 CV* cv = (CV*)SvRV(sv);
1781 SV** mark;
1782 I32 items = 0;
1783 I32 oldsave;
1784
4aa0a1f7
AD
1785 if (!CvROOT(cv) && !CvXSUB(cv)) {
1786 if (CvGV(cv)) {
1787 SV *tmpstr = sv_newmortal();
e5cf08de 1788 gv_efullname3(tmpstr, CvGV(cv), Nullch);
4aa0a1f7
AD
1789 DIE("Goto undefined subroutine &%s",SvPVX(tmpstr));
1790 }
1791 DIE("Goto undefined subroutine");
1792 }
1793
a0d0e21e
LW
1794 /* First do some returnish stuff. */
1795 cxix = dopoptosub(cxstack_ix);
1796 if (cxix < 0)
1797 DIE("Can't goto subroutine outside a subroutine");
1798 if (cxix < cxstack_ix)
1799 dounwind(cxix);
1800 TOPBLOCK(cx);
b150fb22
RH
1801 if (cx->cx_type == CXt_EVAL && cx->blk_eval.old_op_type == OP_ENTEREVAL)
1802 DIE("Can't goto subroutine from an eval-string");
a0d0e21e 1803 mark = stack_sp;
b150fb22
RH
1804 if (cx->cx_type == CXt_SUB &&
1805 cx->blk_sub.hasargs) { /* put @_ back onto stack */
a0d0e21e
LW
1806 AV* av = cx->blk_sub.argarray;
1807
93965878 1808 items = AvFILLp(av) + 1;
1ce6579f
PP
1809 stack_sp++;
1810 EXTEND(stack_sp, items); /* @_ could have been extended. */
1811 Copy(AvARRAY(av), stack_sp, items, SV*);
a0d0e21e 1812 stack_sp += items;
6d4ff0d2 1813#ifndef USE_THREADS
2c05e328 1814 SvREFCNT_dec(GvAV(defgv));
a0d0e21e 1815 GvAV(defgv) = cx->blk_sub.savearray;
6d4ff0d2 1816#endif /* USE_THREADS */
a0d0e21e 1817 AvREAL_off(av);
4633a7c4 1818 av_clear(av);
a0d0e21e 1819 }
1fa4e549
AD
1820 else if (CvXSUB(cv)) { /* put GvAV(defgv) back onto stack */
1821 AV* av;
1822 int i;
1823#ifdef USE_THREADS
1824 av = (AV*)curpad[0];
1825#else
1826 av = GvAV(defgv);
1827#endif
1828 items = AvFILLp(av) + 1;
1829 stack_sp++;
1830 EXTEND(stack_sp, items); /* @_ could have been extended. */
1831 Copy(AvARRAY(av), stack_sp, items, SV*);
1832 stack_sp += items;
1833 }
b150fb22
RH
1834 if (cx->cx_type == CXt_SUB &&
1835 !(CvDEPTH(cx->blk_sub.cv) = cx->blk_sub.olddepth))
a0d0e21e
LW
1836 SvREFCNT_dec(cx->blk_sub.cv);
1837 oldsave = scopestack[scopestack_ix - 1];
1838 LEAVE_SCOPE(oldsave);
1839
1840 /* Now do some callish stuff. */
1841 SAVETMPS;
1842 if (CvXSUB(cv)) {
1843 if (CvOLDSTYLE(cv)) {
ecfc5424 1844 I32 (*fp3)_((int,int,int));
924508f0
GS
1845 while (SP > mark) {
1846 SP[1] = SP[0];
1847 SP--;
a0d0e21e 1848 }
ecfc5424
AD
1849 fp3 = (I32(*)_((int,int,int)))CvXSUB(cv);
1850 items = (*fp3)(CvXSUBANY(cv).any_i32,
1851 mark - stack_base + 1,
1852 items);
924508f0 1853 SP = stack_base + items;
a0d0e21e
LW
1854 }
1855 else {
1fa4e549
AD
1856 SV **newsp;
1857 I32 gimme;
1858
1ce6579f 1859 stack_sp--; /* There is no cv arg. */
1fa4e549
AD
1860 /* Push a mark for the start of arglist */
1861 PUSHMARK(mark);
1d583055 1862 (void)(*CvXSUB(cv))(cv _PERL_OBJECT_THIS);
1fa4e549
AD
1863 /* Pop the current context like a decent sub should */
1864 POPBLOCK(cx, curpm);
1865 /* Do _not_ use PUTBACK, keep the XSUB's return stack! */
a0d0e21e
LW
1866 }
1867 LEAVE;
1868 return pop_return();
1869 }
1870 else {
1871 AV* padlist = CvPADLIST(cv);
1872 SV** svp = AvARRAY(padlist);
b150fb22
RH
1873 if (cx->cx_type == CXt_EVAL) {
1874 in_eval = cx->blk_eval.old_in_eval;
1875 eval_root = cx->blk_eval.old_eval_root;
1876 cx->cx_type = CXt_SUB;
1877 cx->blk_sub.hasargs = 0;
1878 }
a0d0e21e
LW
1879 cx->blk_sub.cv = cv;
1880 cx->blk_sub.olddepth = CvDEPTH(cv);
1881 CvDEPTH(cv)++;
1882 if (CvDEPTH(cv) < 2)
1883 (void)SvREFCNT_inc(cv);
1884 else { /* save temporaries on recursion? */
1885 if (CvDEPTH(cv) == 100 && dowarn)
44a8e56a 1886 sub_crush_depth(cv);
93965878 1887 if (CvDEPTH(cv) > AvFILLp(padlist)) {
a0d0e21e 1888 AV *newpad = newAV();
4aa0a1f7 1889 SV **oldpad = AvARRAY(svp[CvDEPTH(cv)-1]);
93965878 1890 I32 ix = AvFILLp((AV*)svp[1]);
a0d0e21e 1891 svp = AvARRAY(svp[0]);
748a9306 1892 for ( ;ix > 0; ix--) {
a0d0e21e 1893 if (svp[ix] != &sv_undef) {
748a9306 1894 char *name = SvPVX(svp[ix]);
5f05dabc
PP
1895 if ((SvFLAGS(svp[ix]) & SVf_FAKE)
1896 || *name == '&')
1897 {
1898 /* outer lexical or anon code */
748a9306 1899 av_store(newpad, ix,
4aa0a1f7 1900 SvREFCNT_inc(oldpad[ix]) );
748a9306
LW
1901 }
1902 else { /* our own lexical */
1903 if (*name == '@')
1904 av_store(newpad, ix, sv = (SV*)newAV());
1905 else if (*name == '%')
1906 av_store(newpad, ix, sv = (SV*)newHV());
1907 else
1908 av_store(newpad, ix, sv = NEWSV(0,0));
1909 SvPADMY_on(sv);
1910 }
a0d0e21e
LW
1911 }
1912 else {
748a9306 1913 av_store(newpad, ix, sv = NEWSV(0,0));
a0d0e21e
LW
1914 SvPADTMP_on(sv);
1915 }
1916 }
1917 if (cx->blk_sub.hasargs) {
1918 AV* av = newAV();
1919 av_extend(av, 0);
1920 av_store(newpad, 0, (SV*)av);
1921 AvFLAGS(av) = AVf_REIFY;
1922 }
1923 av_store(padlist, CvDEPTH(cv), (SV*)newpad);
93965878 1924 AvFILLp(padlist) = CvDEPTH(cv);
a0d0e21e
LW
1925 svp = AvARRAY(padlist);
1926 }
1927 }
6d4ff0d2
MB
1928#ifdef USE_THREADS
1929 if (!cx->blk_sub.hasargs) {
1930 AV* av = (AV*)curpad[0];
1931
93965878 1932 items = AvFILLp(av) + 1;
6d4ff0d2
MB
1933 if (items) {
1934 /* Mark is at the end of the stack. */
924508f0
GS
1935 EXTEND(SP, items);
1936 Copy(AvARRAY(av), SP + 1, items, SV*);
1937 SP += items;
6d4ff0d2
MB
1938 PUTBACK ;
1939 }
1940 }
1941#endif /* USE_THREADS */
a0d0e21e
LW
1942 SAVESPTR(curpad);
1943 curpad = AvARRAY((AV*)svp[CvDEPTH(cv)]);
6d4ff0d2
MB
1944#ifndef USE_THREADS
1945 if (cx->blk_sub.hasargs)
1946#endif /* USE_THREADS */
1947 {
a0d0e21e
LW
1948 AV* av = (AV*)curpad[0];
1949 SV** ary;
1950
6d4ff0d2 1951#ifndef USE_THREADS
a0d0e21e 1952 cx->blk_sub.savearray = GvAV(defgv);
2c05e328 1953 GvAV(defgv) = (AV*)SvREFCNT_inc(av);
6d4ff0d2
MB
1954#endif /* USE_THREADS */
1955 cx->blk_sub.argarray = av;
a0d0e21e
LW
1956 ++mark;
1957
1958 if (items >= AvMAX(av) + 1) {
1959 ary = AvALLOC(av);
1960 if (AvARRAY(av) != ary) {
1961 AvMAX(av) += AvARRAY(av) - AvALLOC(av);
1962 SvPVX(av) = (char*)ary;
1963 }
1964 if (items >= AvMAX(av) + 1) {
1965 AvMAX(av) = items - 1;
1966 Renew(ary,items+1,SV*);
1967 AvALLOC(av) = ary;
1968 SvPVX(av) = (char*)ary;
1969 }
1970 }
1971 Copy(mark,AvARRAY(av),items,SV*);
93965878 1972 AvFILLp(av) = items - 1;
a0d0e21e
LW
1973
1974 while (items--) {
1975 if (*mark)
1976 SvTEMP_off(*mark);
1977 mark++;
1978 }
1979 }
491527d0 1980 if (PERLDB_SUB) { /* Checking curstash breaks DProf. */
44a8e56a
PP
1981 /*
1982 * We do not care about using sv to call CV;
1983 * it's for informational purposes only.
1984 */
1ce6579f 1985 SV *sv = GvSV(DBsub);
491527d0
GS
1986 CV *gotocv;
1987
1988 if (PERLDB_SUB_NN) {
1989 SvIVX(sv) = (IV)cv; /* Already upgraded, saved */
1990 } else {
1991 save_item(sv);
1992 gv_efullname3(sv, CvGV(cv), Nullch);
1993 }
1994 if ( PERLDB_GOTO
1995 && (gotocv = perl_get_cv("DB::goto", FALSE)) ) {
1996 PUSHMARK( stack_sp );
1997 perl_call_sv((SV*)gotocv, G_SCALAR | G_NODEBUG);
1998 stack_sp--;
1999 }
1ce6579f 2000 }
a0d0e21e
LW
2001 RETURNOP(CvSTART(cv));
2002 }
2003 }
2004 else
2005 label = SvPV(sv,na);
2006 }
2007 else if (op->op_flags & OPf_SPECIAL) {
2008 if (! do_dump)
2009 DIE("goto must have label");
2010 }
2011 else
2012 label = cPVOP->op_pv;
2013
2014 if (label && *label) {
2015 OP *gotoprobe = 0;
2016
2017 /* find label */
2018
2019 lastgotoprobe = 0;
2020 *enterops = 0;
2021 for (ix = cxstack_ix; ix >= 0; ix--) {
2022 cx = &cxstack[ix];
2023 switch (cx->cx_type) {
a0d0e21e
LW
2024 case CXt_EVAL:
2025 gotoprobe = eval_root; /* XXX not good for nested eval */
2026 break;
2027 case CXt_LOOP:
2028 gotoprobe = cx->blk_oldcop->op_sibling;
2029 break;
2030 case CXt_SUBST:
2031 continue;
2032 case CXt_BLOCK:
2033 if (ix)
2034 gotoprobe = cx->blk_oldcop->op_sibling;
2035 else
2036 gotoprobe = main_root;
2037 break;
b3933176
CS
2038 case CXt_SUB:
2039 if (CvDEPTH(cx->blk_sub.cv)) {
2040 gotoprobe = CvROOT(cx->blk_sub.cv);
2041 break;
2042 }
2043 /* FALL THROUGH */
0a753a76
PP
2044 case CXt_NULL:
2045 DIE("Can't \"goto\" outside a block");
a0d0e21e
LW
2046 default:
2047 if (ix)
2048 DIE("panic: goto");
68dc0745 2049 gotoprobe = main_root;
a0d0e21e
LW
2050 break;
2051 }
fc36a67e
PP
2052 retop = dofindlabel(gotoprobe, label,
2053 enterops, enterops + GOTO_DEPTH);
a0d0e21e
LW
2054 if (retop)
2055 break;
2056 lastgotoprobe = gotoprobe;
2057 }
2058 if (!retop)
2059 DIE("Can't find label %s", label);
2060
2061 /* pop unwanted frames */
2062
2063 if (ix < cxstack_ix) {
2064 I32 oldsave;
2065
2066 if (ix < 0)
2067 ix = 0;
2068 dounwind(ix);
2069 TOPBLOCK(cx);
2070 oldsave = scopestack[scopestack_ix];
2071 LEAVE_SCOPE(oldsave);
2072 }
2073
2074 /* push wanted frames */
2075
748a9306 2076 if (*enterops && enterops[1]) {
a0d0e21e 2077 OP *oldop = op;
748a9306 2078 for (ix = 1; enterops[ix]; ix++) {
a0d0e21e 2079 op = enterops[ix];
84902520
TB
2080 /* Eventually we may want to stack the needed arguments
2081 * for each op. For now, we punt on the hard ones. */
2082 if (op->op_type == OP_ENTERITER)
2083 DIE("Can't \"goto\" into the middle of a foreach loop",
2084 label);
0824fdcb 2085 (CALLOP->op_ppaddr)(ARGS);
a0d0e21e
LW
2086 }
2087 op = oldop;
2088 }
2089 }
2090
2091 if (do_dump) {
a5f75d66
AD
2092#ifdef VMS
2093 if (!retop) retop = main_start;
2094#endif
a0d0e21e
LW
2095 restartop = retop;
2096 do_undump = TRUE;
2097
2098 my_unexec();
2099
2100 restartop = 0; /* hmm, must be GNU unexec().. */
2101 do_undump = FALSE;
2102 }
2103
e336de0d 2104 if (top_env->je_prev) {
748a9306 2105 restartop = retop;
6224f72b 2106 JMPENV_JUMP(3);
748a9306
LW
2107 }
2108
a0d0e21e
LW
2109 RETURNOP(retop);
2110}
2111
2112PP(pp_exit)
2113{
4e35701f 2114 djSP;
a0d0e21e
LW
2115 I32 anum;
2116
2117 if (MAXARG < 1)
2118 anum = 0;
ff0cee69 2119 else {
a0d0e21e 2120 anum = SvIVx(POPs);
ff0cee69
PP
2121#ifdef VMSISH_EXIT
2122 if (anum == 1 && VMSISH_EXIT)
2123 anum = 0;
2124#endif
2125 }
a0d0e21e
LW
2126 my_exit(anum);
2127 PUSHs(&sv_undef);
2128 RETURN;
2129}
2130
2131#ifdef NOTYET
2132PP(pp_nswitch)
2133{
4e35701f 2134 djSP;
a0d0e21e
LW
2135 double value = SvNVx(GvSV(cCOP->cop_gv));
2136 register I32 match = I_32(value);
2137
2138 if (value < 0.0) {
2139 if (((double)match) > value)
2140 --match; /* was fractional--truncate other way */
2141 }
2142 match -= cCOP->uop.scop.scop_offset;
2143 if (match < 0)
2144 match = 0;
2145 else if (match > cCOP->uop.scop.scop_max)
2146 match = cCOP->uop.scop.scop_max;
2147 op = cCOP->uop.scop.scop_next[match];
2148 RETURNOP(op);
2149}
2150
2151PP(pp_cswitch)
2152{
4e35701f 2153 djSP;
a0d0e21e
LW
2154 register I32 match;
2155
2156 if (multiline)
2157 op = op->op_next; /* can't assume anything */
2158 else {
2159 match = *(SvPVx(GvSV(cCOP->cop_gv), na)) & 255;
2160 match -= cCOP->uop.scop.scop_offset;
2161 if (match < 0)
2162 match = 0;
2163 else if (match > cCOP->uop.scop.scop_max)
2164 match = cCOP->uop.scop.scop_max;
2165 op = cCOP->uop.scop.scop_next[match];
2166 }
2167 RETURNOP(op);
2168}
2169#endif
2170
2171/* Eval. */
2172
0824fdcb 2173STATIC void
8ac85365 2174save_lines(AV *array, SV *sv)
a0d0e21e
LW
2175{
2176 register char *s = SvPVX(sv);
2177 register char *send = SvPVX(sv) + SvCUR(sv);
2178 register char *t;
2179 register I32 line = 1;
2180
2181 while (s && s < send) {
2182 SV *tmpstr = NEWSV(85,0);
2183
2184 sv_upgrade(tmpstr, SVt_PVMG);
2185 t = strchr(s, '\n');
2186 if (t)
2187 t++;
2188 else
2189 t = send;
2190
2191 sv_setpvn(tmpstr, s, t - s);
2192 av_store(array, line++, tmpstr);
2193 s = t;
2194 }
2195}
2196
0824fdcb 2197STATIC OP *
8ac85365 2198docatch(OP *o)
1e422769 2199{
e858de61 2200 dTHR;
6224f72b 2201 int ret;
1e422769 2202 OP *oldop = op;
54310121 2203 dJMPENV;
1e422769
PP
2204
2205 op = o;
1e422769 2206#ifdef DEBUGGING
54310121 2207 assert(CATCH_GET == TRUE);
7c06b590 2208 DEBUG_l(deb("Setting up local jumplevel %p, was %p\n", &cur_env, top_env));
1e422769 2209#endif
6224f72b
GS
2210 JMPENV_PUSH(ret);
2211 switch (ret) {
1e422769 2212 default: /* topmost level handles it */
54310121 2213 JMPENV_POP;
1e422769 2214 op = oldop;
6224f72b 2215 JMPENV_JUMP(ret);
1e422769 2216 /* NOTREACHED */
6224f72b 2217 case 3:
1e422769
PP
2218 if (!restartop) {
2219 PerlIO_printf(PerlIO_stderr(), "panic: restartop\n");
2220 break;
2221 }
1e422769
PP
2222 op = restartop;
2223 restartop = 0;
2224 /* FALL THROUGH */
6224f72b 2225 case 0:
0824fdcb 2226 CALLRUNOPS();
1e422769
PP
2227 break;
2228 }
54310121 2229 JMPENV_POP;
1e422769
PP
2230 op = oldop;
2231 return Nullop;
2232}
2233
c277df42
IZ
2234OP *
2235sv_compile_2op(SV *sv, OP** startop, char *code, AV** avp)
2236/* sv Text to convert to OP tree. */
2237/* startop op_free() this to undo. */
2238/* code Short string id of the caller. */
2239{
2240 dSP; /* Make POPBLOCK work. */
2241 PERL_CONTEXT *cx;
2242 SV **newsp;
f987c7de 2243 I32 gimme = 0; /* SUSPECT - INITIALZE TO WHAT? NI-S */
c277df42
IZ
2244 I32 optype;
2245 OP dummy;
2246 OP *oop = op, *rop;
2247 char tmpbuf[TYPE_DIGITS(long) + 12 + 10];
2248 char *safestr;
2249
2250 ENTER;
2251 lex_start(sv);
2252 SAVETMPS;
2253 /* switch to eval mode */
2254
2255 SAVESPTR(compiling.cop_filegv);
2256 SAVEI16(compiling.cop_line);
2257 sprintf(tmpbuf, "_<(%.10s_eval %lu)", code, (unsigned long)++evalseq);
2258 compiling.cop_filegv = gv_fetchfile(tmpbuf+2);
2259 compiling.cop_line = 1;
2260 /* XXX For C<eval "...">s within BEGIN {} blocks, this ends up
2261 deleting the eval's FILEGV from the stash before gv_check() runs
2262 (i.e. before run-time proper). To work around the coredump that
2263 ensues, we always turn GvMULTI_on for any globals that were
2264 introduced within evals. See force_ident(). GSAR 96-10-12 */
2265 safestr = savepv(tmpbuf);
2266 SAVEDELETE(defstash, safestr, strlen(safestr));
b3ac6de7 2267 SAVEHINTS();
d1ca3daa
GA
2268#ifdef OP_IN_REGISTER
2269 opsave = op;
2270#else
c277df42 2271 SAVEPPTR(op);
d1ca3daa 2272#endif
c277df42
IZ
2273 hints = 0;
2274
2275 op = &dummy;
2276 op->op_type = 0; /* Avoid uninit warning. */
2277 op->op_flags = 0; /* Avoid uninit warning. */
2278 PUSHBLOCK(cx, CXt_EVAL, SP);
2279 PUSHEVAL(cx, 0, compiling.cop_filegv);
2280 rop = doeval(G_SCALAR, startop);
2281 POPBLOCK(cx,curpm);
2282 POPEVAL(cx);
2283
2284 (*startop)->op_type = OP_NULL;
2285 (*startop)->op_ppaddr = ppaddr[OP_NULL];
2286 lex_end();
2287 *avp = (AV*)SvREFCNT_inc(comppad);
2288 LEAVE;
d1ca3daa
GA
2289#ifdef OP_IN_REGISTER
2290 op = opsave;
2291#endif
c277df42
IZ
2292 return rop;
2293}
2294
0f15f207 2295/* With USE_THREADS, eval_owner must be held on entry to doeval */
0824fdcb 2296STATIC OP *
c277df42 2297doeval(int gimme, OP** startop)
a0d0e21e
LW
2298{
2299 dSP;
2300 OP *saveop = op;
2301 HV *newstash;
ff3ff8d1 2302 CV *caller;
748a9306 2303 AV* comppadlist;
67a38de0 2304 I32 i;
a0d0e21e
LW
2305
2306 in_eval = 1;
2307
1ce6579f
PP
2308 PUSHMARK(SP);
2309
a0d0e21e
LW
2310 /* set up a scratch pad */
2311
55497cff 2312 SAVEI32(padix);
a0d0e21e
LW
2313 SAVESPTR(curpad);
2314 SAVESPTR(comppad);
2315 SAVESPTR(comppad_name);
55497cff
PP
2316 SAVEI32(comppad_name_fill);
2317 SAVEI32(min_intro_pending);
2318 SAVEI32(max_intro_pending);
748a9306 2319
ff3ff8d1 2320 caller = compcv;
67a38de0
NIS
2321 for (i = cxstack_ix - 1; i >= 0; i--) {
2322 PERL_CONTEXT *cx = &cxstack[i];
2323 if (cx->cx_type == CXt_EVAL)
2324 break;
2325 else if (cx->cx_type == CXt_SUB) {
2326 caller = cx->blk_sub.cv;
2327 break;
2328 }
2329 }
2330
748a9306
LW
2331 SAVESPTR(compcv);
2332 compcv = (CV*)NEWSV(1104,0);
2333 sv_upgrade((SV *)compcv, SVt_PVCV);
07055b4c 2334 CvUNIQUE_on(compcv);
11343788
MB
2335#ifdef USE_THREADS
2336 CvOWNER(compcv) = 0;
12ca11f6 2337 New(666, CvMUTEXP(compcv), 1, perl_mutex);
11343788 2338 MUTEX_INIT(CvMUTEXP(compcv));
11343788 2339#endif /* USE_THREADS */
748a9306 2340
a0d0e21e 2341 comppad = newAV();
6d4ff0d2
MB
2342 av_push(comppad, Nullsv);
2343 curpad = AvARRAY(comppad);
a0d0e21e
LW
2344 comppad_name = newAV();
2345 comppad_name_fill = 0;
6d4ff0d2
MB
2346 min_intro_pending = 0;
2347 padix = 0;
11343788
MB
2348#ifdef USE_THREADS
2349 av_store(comppad_name, 0, newSVpv("@_", 2));
6d4ff0d2
MB
2350 curpad[0] = (SV*)newAV();
2351 SvPADMY_on(curpad[0]); /* XXX Needed? */
11343788 2352#endif /* USE_THREADS */
a0d0e21e 2353
748a9306
LW
2354 comppadlist = newAV();
2355 AvREAL_off(comppadlist);
8e07c86e
AD
2356 av_store(comppadlist, 0, (SV*)comppad_name);
2357 av_store(comppadlist, 1, (SV*)comppad);
748a9306 2358 CvPADLIST(compcv) = comppadlist;
2c05e328 2359
c277df42 2360 if (!saveop || saveop->op_type != OP_REQUIRE)
199100c8 2361 CvOUTSIDE(compcv) = (CV*)SvREFCNT_inc(caller);
07055b4c 2362
8e07c86e 2363 SAVEFREESV(compcv);
748a9306 2364
a0d0e21e
LW
2365 /* make sure we compile in the right package */
2366
2367 newstash = curcop->cop_stash;
2368 if (curstash != newstash) {
2369 SAVESPTR(curstash);
2370 curstash = newstash;
2371 }
2372 SAVESPTR(beginav);
2373 beginav = newAV();
2374 SAVEFREESV(beginav);
2375
2376 /* try to compile it */
2377
2378 eval_root = Nullop;
2379 error_count = 0;
2380 curcop = &compiling;
2381 curcop->cop_arybase = 0;
c07a80fd
PP
2382 SvREFCNT_dec(rs);
2383 rs = newSVpv("\n", 1);
c277df42 2384 if (saveop && saveop->op_flags & OPf_SPECIAL)
1ce6579f
PP
2385 in_eval |= 4;
2386 else
38a03e6e 2387 sv_setpv(ERRSV,"");
a0d0e21e
LW
2388 if (yyparse() || error_count || !eval_root) {
2389 SV **newsp;
2390 I32 gimme;
c09156bb 2391 PERL_CONTEXT *cx;
c277df42 2392 I32 optype = 0; /* Might be reset by POPEVAL. */
a0d0e21e
LW
2393
2394 op = saveop;
2395 if (eval_root) {
2396 op_free(eval_root);
2397 eval_root = Nullop;
2398 }
1ce6579f 2399 SP = stack_base + POPMARK; /* pop original mark */
c277df42
IZ
2400 if (!startop) {
2401 POPBLOCK(cx,curpm);
2402 POPEVAL(cx);
2403 pop_return();
2404 }
a0d0e21e
LW
2405 lex_end();
2406 LEAVE;
7a2e2cd6 2407 if (optype == OP_REQUIRE) {
38a03e6e 2408 char* msg = SvPVx(ERRSV, na);
7a2e2cd6 2409 DIE("%s", *msg ? msg : "Compilation failed in require");
c277df42
IZ
2410 } else if (startop) {
2411 char* msg = SvPVx(ERRSV, na);
2412
2413 POPBLOCK(cx,curpm);
2414 POPEVAL(cx);
2415 croak("%sCompilation failed in regexp", (*msg ? msg : "Unknown error\n"));
7a2e2cd6 2416 }
c07a80fd
PP
2417 SvREFCNT_dec(rs);
2418 rs = SvREFCNT_inc(nrs);
f2134d95
MB
2419#ifdef USE_THREADS
2420 MUTEX_LOCK(&eval_mutex);
2421 eval_owner = 0;
2422 COND_SIGNAL(&eval_cond);
2423 MUTEX_UNLOCK(&eval_mutex);
2424#endif /* USE_THREADS */
a0d0e21e
LW
2425 RETPUSHUNDEF;
2426 }
c07a80fd
PP
2427 SvREFCNT_dec(rs);
2428 rs = SvREFCNT_inc(nrs);
a0d0e21e 2429 compiling.cop_line = 0;
c277df42
IZ
2430 if (startop) {
2431 *startop = eval_root;
2432 SvREFCNT_dec(CvOUTSIDE(compcv));
2433 CvOUTSIDE(compcv) = Nullcv;
2434 } else
2435 SAVEFREEOP(eval_root);
54310121
PP
2436 if (gimme & G_VOID)
2437 scalarvoid(eval_root);
2438 else if (gimme & G_ARRAY)
a0d0e21e
LW
2439 list(eval_root);
2440 else
2441 scalar(eval_root);
2442
2443 DEBUG_x(dump_eval());
2444
55497cff 2445 /* Register with debugger: */
84902520 2446 if (PERLDB_INTER && saveop->op_type == OP_REQUIRE) {
55497cff 2447 CV *cv = perl_get_cv("DB::postponed", FALSE);
55497cff
PP
2448 if (cv) {
2449 dSP;
924508f0 2450 PUSHMARK(SP);
55497cff
PP
2451 XPUSHs((SV*)compiling.cop_filegv);
2452 PUTBACK;
2453 perl_call_sv((SV*)cv, G_DISCARD);
2454 }
2455 }
2456
a0d0e21e
LW
2457 /* compiled okay, so do it */
2458
4fdae800 2459 CvDEPTH(compcv) = 1;
1ce6579f 2460 SP = stack_base + POPMARK; /* pop original mark */
c277df42 2461 op = saveop; /* The caller may need it. */
b35b2403 2462#ifdef USE_THREADS
11343788
MB
2463 MUTEX_LOCK(&eval_mutex);
2464 eval_owner = 0;
2465 COND_SIGNAL(&eval_cond);
2466 MUTEX_UNLOCK(&eval_mutex);
b35b2403 2467#endif /* USE_THREADS */
5dc0d613 2468
a0d0e21e
LW
2469 RETURNOP(eval_start);
2470}
2471
2472PP(pp_require)
2473{
4e35701f 2474 djSP;
c09156bb 2475 register PERL_CONTEXT *cx;
a0d0e21e
LW
2476 SV *sv;
2477 char *name;
6132ea6c 2478 STRLEN len;
46fc3d4c
PP
2479 char *tryname;
2480 SV *namesv = Nullsv;
a0d0e21e
LW
2481 SV** svp;
2482 I32 gimme = G_SCALAR;
760ac839 2483 PerlIO *tryrsfp = 0;
a0d0e21e
LW
2484
2485 sv = POPs;
4633a7c4 2486 if (SvNIOKp(sv) && !SvPOKp(sv)) {
36477c24 2487 SET_NUMERIC_STANDARD();
a5f75d66
AD
2488 if (atof(patchlevel) + 0.00000999 < SvNV(sv))
2489 DIE("Perl %s required--this is only version %s, stopped",
2490 SvPV(sv,na),patchlevel);
a0d0e21e
LW
2491 RETPUSHYES;
2492 }
6132ea6c
GS
2493 name = SvPV(sv, len);
2494 if (!(name && len > 0 && *name))
a0d0e21e 2495 DIE("Null filename used");
4633a7c4 2496 TAINT_PROPER("require");
a0d0e21e 2497 if (op->op_type == OP_REQUIRE &&
6132ea6c 2498 (svp = hv_fetch(GvHVn(incgv), name, len, 0)) &&
a0d0e21e
LW
2499 *svp != &sv_undef)
2500 RETPUSHYES;
2501
2502 /* prepare to compile file */
2503
46fc3d4c
PP
2504 if (*name == '/' ||
2505 (*name == '.' &&
2506 (name[1] == '/' ||
2507 (name[1] == '.' && name[2] == '/')))
4633a7c4 2508#ifdef DOSISH
46fc3d4c 2509 || (name[0] && name[1] == ':')
4633a7c4 2510#endif
ba42ef2f
WJ
2511#ifdef WIN32
2512 || (name[0] == '\\' && name[1] == '\\') /* UNC path */
2513#endif
748a9306 2514#ifdef VMS
46fc3d4c
PP
2515 || (strchr(name,':') || ((*name == '[' || *name == '<') &&
2516 (isALNUM(name[1]) || strchr("$-_]>",name[1]))))
748a9306
LW
2517#endif
2518 )
a0d0e21e 2519 {
46fc3d4c 2520 tryname = name;
a868473f 2521 tryrsfp = PerlIO_open(name,PERL_SCRIPT_MODE);
a0d0e21e
LW
2522 }
2523 else {
2524 AV *ar = GvAVn(incgv);
2525 I32 i;
748a9306 2526#ifdef VMS
46fc3d4c
PP
2527 char *unixname;
2528 if ((unixname = tounixspec(name, Nullch)) != Nullch)
2529#endif
2530 {
2531 namesv = NEWSV(806, 0);
2532 for (i = 0; i <= AvFILL(ar); i++) {
2533 char *dir = SvPVx(*av_fetch(ar, i, TRUE), na);
2534#ifdef VMS
2535 char *unixdir;
2536 if ((unixdir = tounixpath(dir, Nullch)) == Nullch)
2537 continue;
2538 sv_setpv(namesv, unixdir);
2539 sv_catpv(namesv, unixname);
748a9306 2540#else
46fc3d4c 2541 sv_setpvf(namesv, "%s/%s", dir, name);
748a9306 2542#endif
46fc3d4c 2543 tryname = SvPVX(namesv);
a868473f 2544 tryrsfp = PerlIO_open(tryname, PERL_SCRIPT_MODE);
46fc3d4c
PP
2545 if (tryrsfp) {
2546 if (tryname[0] == '.' && tryname[1] == '/')
2547 tryname += 2;
2548 break;
2549 }
a0d0e21e
LW
2550 }
2551 }
2552 }
2553 SAVESPTR(compiling.cop_filegv);
46fc3d4c
PP
2554 compiling.cop_filegv = gv_fetchfile(tryrsfp ? tryname : name);
2555 SvREFCNT_dec(namesv);
a0d0e21e
LW
2556 if (!tryrsfp) {
2557 if (op->op_type == OP_REQUIRE) {
cca87523 2558 SV *msg = sv_2mortal(newSVpvf("Can't locate %s in @INC", name));
2683423c
JA
2559 SV *dirmsgsv = NEWSV(0, 0);
2560 AV *ar = GvAVn(incgv);
2561 I32 i;
46fc3d4c
PP
2562 if (instr(SvPVX(msg), ".h "))
2563 sv_catpv(msg, " (change .h to .ph maybe?)");
2564 if (instr(SvPVX(msg), ".ph "))
2565 sv_catpv(msg, " (did you run h2ph?)");
3e3baf6d 2566 sv_catpv(msg, " (@INC contains:");
2683423c
JA
2567 for (i = 0; i <= AvFILL(ar); i++) {
2568 char *dir = SvPVx(*av_fetch(ar, i, TRUE), na);
3e3baf6d 2569 sv_setpvf(dirmsgsv, " %s", dir);
2683423c
JA
2570 sv_catsv(msg, dirmsgsv);
2571 }
3e3baf6d 2572 sv_catpvn(msg, ")", 1);
2683423c 2573 SvREFCNT_dec(dirmsgsv);
fc36a67e 2574 DIE("%_", msg);
a0d0e21e
LW
2575 }
2576
2577 RETPUSHUNDEF;
2578 }
2579
2580 /* Assume success here to prevent recursive requirement. */
2581 (void)hv_store(GvHVn(incgv), name, strlen(name),
2582 newSVsv(GvSV(compiling.cop_filegv)), 0 );
2583
2584 ENTER;
2585 SAVETMPS;
2586 lex_start(sv_2mortal(newSVpv("",0)));
e50aee73
AD
2587 if (rsfp_filters){
2588 save_aptr(&rsfp_filters);
2589 rsfp_filters = NULL;
2590 }
2591
a0d0e21e
LW
2592 rsfp = tryrsfp;
2593 name = savepv(name);
2594 SAVEFREEPV(name);
b3ac6de7 2595 SAVEHINTS();
a0d0e21e
LW
2596 hints = 0;
2597
2598 /* switch to eval mode */
2599
2600 push_return(op->op_next);
2601 PUSHBLOCK(cx, CXt_EVAL, SP);
2602 PUSHEVAL(cx, name, compiling.cop_filegv);
2603
2604 compiling.cop_line = 0;
2605
2606 PUTBACK;
0f15f207
MB
2607#ifdef USE_THREADS
2608 MUTEX_LOCK(&eval_mutex);
2609 if (eval_owner && eval_owner != thr)
2610 while (eval_owner)
2611 COND_WAIT(&eval_cond, &eval_mutex);
2612 eval_owner = thr;
2613 MUTEX_UNLOCK(&eval_mutex);
2614#endif /* USE_THREADS */
c277df42 2615 return DOCATCH(doeval(G_SCALAR, NULL));
a0d0e21e
LW
2616}
2617
2618PP(pp_dofile)
2619{
2620 return pp_require(ARGS);
2621}
2622
2623PP(pp_entereval)
2624{
4e35701f 2625 djSP;
c09156bb 2626 register PERL_CONTEXT *cx;
a0d0e21e 2627 dPOPss;
54310121 2628 I32 gimme = GIMME_V, was = sub_generation;
fc36a67e
PP
2629 char tmpbuf[TYPE_DIGITS(long) + 12];
2630 char *safestr;
a0d0e21e 2631 STRLEN len;
55497cff 2632 OP *ret;
a0d0e21e
LW
2633
2634 if (!SvPV(sv,len) || !len)
2635 RETPUSHUNDEF;
748a9306 2636 TAINT_PROPER("eval");
a0d0e21e
LW
2637
2638 ENTER;
a0d0e21e 2639 lex_start(sv);
748a9306 2640 SAVETMPS;
a0d0e21e
LW
2641
2642 /* switch to eval mode */
2643
748a9306 2644 SAVESPTR(compiling.cop_filegv);
ff0cee69 2645 sprintf(tmpbuf, "_<(eval %lu)", (unsigned long)++evalseq);
a0d0e21e
LW
2646 compiling.cop_filegv = gv_fetchfile(tmpbuf+2);
2647 compiling.cop_line = 1;
55497cff
PP
2648 /* XXX For C<eval "...">s within BEGIN {} blocks, this ends up
2649 deleting the eval's FILEGV from the stash before gv_check() runs
2650 (i.e. before run-time proper). To work around the coredump that
2651 ensues, we always turn GvMULTI_on for any globals that were
2652 introduced within evals. See force_ident(). GSAR 96-10-12 */
2653 safestr = savepv(tmpbuf);
2654 SAVEDELETE(defstash, safestr, strlen(safestr));
b3ac6de7 2655 SAVEHINTS();
a0d0e21e
LW
2656 hints = op->op_targ;
2657
2658 push_return(op->op_next);
2659 PUSHBLOCK(cx, CXt_EVAL, SP);
2660 PUSHEVAL(cx, 0, compiling.cop_filegv);
2661
2662 /* prepare to compile string */
2663
08ea043f 2664 if (PERLDB_LINE && curstash != debstash)
a0d0e21e
LW
2665 save_lines(GvAV(compiling.cop_filegv), linestr);
2666 PUTBACK;
0f15f207
MB
2667#ifdef USE_THREADS
2668 MUTEX_LOCK(&eval_mutex);
2669 if (eval_owner && eval_owner != thr)
2670 while (eval_owner)
2671 COND_WAIT(&eval_cond, &eval_mutex);
2672 eval_owner = thr;
2673 MUTEX_UNLOCK(&eval_mutex);
2674#endif /* USE_THREADS */
c277df42 2675 ret = doeval(gimme, NULL);
08ea043f 2676 if (PERLDB_INTER && was != sub_generation /* Some subs defined here. */
e506e776 2677 && ret != op->op_next) { /* Successive compilation. */
55497cff
PP
2678 strcpy(safestr, "_<(eval )"); /* Anything fake and short. */
2679 }
1e422769 2680 return DOCATCH(ret);
a0d0e21e
LW
2681}
2682
2683PP(pp_leaveeval)
2684{
4e35701f 2685 djSP;
a0d0e21e
LW
2686 register SV **mark;
2687 SV **newsp;
2688 PMOP *newpm;
2689 I32 gimme;
c09156bb 2690 register PERL_CONTEXT *cx;
a0d0e21e 2691 OP *retop;
760ac839 2692 U8 save_flags = op -> op_flags;
a0d0e21e
LW
2693 I32 optype;
2694
2695 POPBLOCK(cx,newpm);
2696 POPEVAL(cx);
2697 retop = pop_return();
2698
a1f49e72 2699 TAINT_NOT;
54310121
PP
2700 if (gimme == G_VOID)
2701 MARK = newsp;
2702 else if (gimme == G_SCALAR) {
2703 MARK = newsp + 1;
2704 if (MARK <= SP) {
2705 if (SvFLAGS(TOPs) & SVs_TEMP)
2706 *MARK = TOPs;
2707 else
2708 *MARK = sv_mortalcopy(TOPs);
2709 }
a0d0e21e 2710 else {
54310121
PP
2711 MEXTEND(mark,0);
2712 *MARK = &sv_undef;
a0d0e21e 2713 }
a0d0e21e
LW
2714 }
2715 else {
a1f49e72
CS
2716 /* in case LEAVE wipes old return values */
2717 for (mark = newsp + 1; mark <= SP; mark++) {
2718 if (!(SvFLAGS(*mark) & SVs_TEMP)) {
a0d0e21e 2719 *mark = sv_mortalcopy(*mark);
a1f49e72
CS
2720 TAINT_NOT; /* Each item is independent */
2721 }
2722 }
a0d0e21e
LW
2723 }
2724 curpm = newpm; /* Don't pop $1 et al till now */
2725
84902520
TB
2726 /*
2727 * Closures mentioned at top level of eval cannot be referenced
2728 * again, and their presence indirectly causes a memory leak.
2729 * (Note that the fact that compcv and friends are still set here
2730 * is, AFAIK, an accident.) --Chip
2731 */
93965878 2732 if (AvFILLp(comppad_name) >= 0) {
84902520
TB
2733 SV **svp = AvARRAY(comppad_name);
2734 I32 ix;
93965878 2735 for (ix = AvFILLp(comppad_name); ix >= 0; ix--) {
84902520
TB
2736 SV *sv = svp[ix];
2737 if (sv && sv != &sv_undef && *SvPVX(sv) == '&') {
2738 SvREFCNT_dec(sv);
2739 svp[ix] = &sv_undef;
2740
2741 sv = curpad[ix];
2742 if (CvCLONE(sv)) {
2743 SvREFCNT_dec(CvOUTSIDE(sv));
2744 CvOUTSIDE(sv) = Nullcv;
2745 }
2746 else {
2747 SvREFCNT_dec(sv);
2748 sv = NEWSV(0,0);
2749 SvPADTMP_on(sv);
2750 curpad[ix] = sv;
2751 }
2752 }
2753 }
2754 }
2755
4fdae800
PP
2756#ifdef DEBUGGING
2757 assert(CvDEPTH(compcv) == 1);
2758#endif
2759 CvDEPTH(compcv) = 0;
f46d017c 2760 lex_end();
4fdae800 2761
1ce6579f 2762 if (optype == OP_REQUIRE &&
924508f0 2763 !(gimme == G_SCALAR ? SvTRUE(*SP) : SP > newsp))
54310121 2764 {
1ce6579f 2765 /* Unassume the success we assumed earlier. */
54310121 2766 char *name = cx->blk_eval.old_name;
1ce6579f
PP
2767 (void)hv_delete(GvHVn(incgv), name, strlen(name), G_DISCARD);
2768 retop = die("%s did not return a true value", name);
f46d017c
GS
2769 /* die_where() did LEAVE, or we won't be here */
2770 }
2771 else {
2772 LEAVE;
2773 if (!(save_flags & OPf_SPECIAL))
2774 sv_setpv(ERRSV,"");
a0d0e21e 2775 }
a0d0e21e
LW
2776
2777 RETURNOP(retop);
2778}
2779
a0d0e21e
LW
2780PP(pp_entertry)
2781{
4e35701f 2782 djSP;
c09156bb 2783 register PERL_CONTEXT *cx;
54310121 2784 I32 gimme = GIMME_V;
a0d0e21e
LW
2785
2786 ENTER;
2787 SAVETMPS;
2788
2789 push_return(cLOGOP->op_other->op_next);
2790 PUSHBLOCK(cx, CXt_EVAL, SP);
2791 PUSHEVAL(cx, 0, 0);
2792 eval_root = op; /* Only needed so that goto works right. */
2793
2794 in_eval = 1;
38a03e6e 2795 sv_setpv(ERRSV,"");
1e422769
PP
2796 PUTBACK;
2797 return DOCATCH(op->op_next);
a0d0e21e
LW
2798}
2799
2800PP(pp_leavetry)
2801{
4e35701f 2802 djSP;
a0d0e21e
LW
2803 register SV **mark;
2804 SV **newsp;
2805 PMOP *newpm;
2806 I32 gimme;
c09156bb 2807 register PERL_CONTEXT *cx;
a0d0e21e
LW
2808 I32 optype;
2809
2810 POPBLOCK(cx,newpm);
2811 POPEVAL(cx);
2812 pop_return();
2813
a1f49e72 2814 TAINT_NOT;
54310121
PP
2815 if (gimme == G_VOID)
2816 SP = newsp;
2817 else if (gimme == G_SCALAR) {
2818 MARK = newsp + 1;
2819 if (MARK <= SP) {
2820 if (SvFLAGS(TOPs) & (SVs_PADTMP|SVs_TEMP))
2821 *MARK = TOPs;
2822 else
2823 *MARK = sv_mortalcopy(TOPs);
2824 }
a0d0e21e 2825 else {
54310121
PP
2826 MEXTEND(mark,0);
2827 *MARK = &sv_undef;
a0d0e21e
LW
2828 }
2829 SP = MARK;
2830 }
2831 else {
a1f49e72
CS
2832 /* in case LEAVE wipes old return values */
2833 for (mark = newsp + 1; mark <= SP; mark++) {
2834 if (!(SvFLAGS(*mark) & (SVs_PADTMP|SVs_TEMP))) {
a0d0e21e 2835 *mark = sv_mortalcopy(*mark);
a1f49e72
CS
2836 TAINT_NOT; /* Each item is independent */
2837 }
2838 }
a0d0e21e
LW
2839 }
2840 curpm = newpm; /* Don't pop $1 et al till now */
2841
2842 LEAVE;
38a03e6e 2843 sv_setpv(ERRSV,"");
a0d0e21e
LW
2844 RETURN;
2845}
2846
0824fdcb 2847STATIC void
8ac85365 2848doparseform(SV *sv)
a0d0e21e
LW
2849{
2850 STRLEN len;
2851 register char *s = SvPV_force(sv, len);
2852 register char *send = s + len;
2853 register char *base;
2854 register I32 skipspaces = 0;
2855 bool noblank;
2856 bool repeat;
2857 bool postspace = FALSE;
2858 U16 *fops;
2859 register U16 *fpc;
2860 U16 *linepc;
2861 register I32 arg;
2862 bool ischop;
2863
55497cff 2864 if (len == 0)
bbce6d69 2865 croak("Null picture in formline");
55497cff
PP
2866
2867 New(804, fops, (send - s)*3+10, U16); /* Almost certainly too long... */
a0d0e21e
LW
2868 fpc = fops;
2869
2870 if (s < send) {
2871 linepc = fpc;
2872 *fpc++ = FF_LINEMARK;
2873 noblank = repeat = FALSE;
2874 base = s;
2875 }
2876
2877 while (s <= send) {
2878 switch (*s++) {
2879 default:
2880 skipspaces = 0;
2881 continue;
2882
2883 case '~':
2884 if (*s == '~') {
2885 repeat = TRUE;
2886 *s = ' ';
2887 }
2888 noblank = TRUE;
2889 s[-1] = ' ';
2890 /* FALL THROUGH */
2891 case ' ': case '\t':
2892 skipspaces++;
2893 continue;
2894
2895 case '\n': case 0:
2896 arg = s - base;
2897 skipspaces++;
2898 arg -= skipspaces;
2899 if (arg) {
5f05dabc 2900 if (postspace)
a0d0e21e 2901 *fpc++ = FF_SPACE;
a0d0e21e
LW
2902 *fpc++ = FF_LITERAL;
2903 *fpc++ = arg;
2904 }
5f05dabc 2905 postspace = FALSE;
a0d0e21e
LW
2906 if (s <= send)
2907 skipspaces--;
2908 if (skipspaces) {
2909 *fpc++ = FF_SKIP;
2910 *fpc++ = skipspaces;
2911 }
2912 skipspaces = 0;
2913 if (s <= send)
2914 *fpc++ = FF_NEWLINE;
2915 if (noblank) {
2916 *fpc++ = FF_BLANK;
2917 if (repeat)
2918 arg = fpc - linepc + 1;
2919 else
2920 arg = 0;
2921 *fpc++ = arg;
2922 }
2923 if (s < send) {
2924 linepc = fpc;
2925 *fpc++ = FF_LINEMARK;
2926 noblank = repeat = FALSE;
2927 base = s;
2928 }
2929 else
2930 s++;
2931 continue;
2932
2933 case '@':
2934 case '^':
2935 ischop = s[-1] == '^';
2936
2937 if (postspace) {
2938 *fpc++ = FF_SPACE;
2939 postspace = FALSE;
2940 }
2941 arg = (s - base) - 1;
2942 if (arg) {
2943 *fpc++ = FF_LITERAL;
2944 *fpc++ = arg;
2945 }
2946
2947 base = s - 1;
2948 *fpc++ = FF_FETCH;
2949 if (*s == '*') {
2950 s++;
2951 *fpc++ = 0;
2952 *fpc++ = FF_LINEGLOB;
2953 }
2954 else if (*s == '#' || (*s == '.' && s[1] == '#')) {
2955 arg = ischop ? 512 : 0;
2956 base = s - 1;
2957 while (*s == '#')
2958 s++;
2959 if (*s == '.') {
2960 char *f;
2961 s++;
2962 f = s;
2963 while (*s == '#')
2964 s++;
2965 arg |= 256 + (s - f);
2966 }
2967 *fpc++ = s - base; /* fieldsize for FETCH */
2968 *fpc++ = FF_DECIMAL;
2969 *fpc++ = arg;
2970 }
2971 else {
2972 I32 prespace = 0;
2973 bool ismore = FALSE;
2974
2975 if (*s == '>') {
2976 while (*++s == '>') ;
2977 prespace = FF_SPACE;
2978 }
2979 else if (*s == '|') {
2980 while (*++s == '|') ;
2981 prespace = FF_HALFSPACE;
2982 postspace = TRUE;
2983 }
2984 else {
2985 if (*s == '<')
2986 while (*++s == '<') ;
2987 postspace = TRUE;
2988 }
2989 if (*s == '.' && s[1] == '.' && s[2] == '.') {
2990 s += 3;
2991 ismore = TRUE;
2992 }
2993 *fpc++ = s - base; /* fieldsize for FETCH */
2994
2995 *fpc++ = ischop ? FF_CHECKCHOP : FF_CHECKNL;
2996
2997 if (prespace)
2998 *fpc++ = prespace;
2999 *fpc++ = FF_ITEM;
3000 if (ismore)
3001 *fpc++ = FF_MORE;
3002 if (ischop)
3003 *fpc++ = FF_CHOP;
3004 }
3005 base = s;
3006 skipspaces = 0;
3007 continue;
3008 }
3009 }
3010 *fpc++ = FF_END;
3011
3012 arg = fpc - fops;
3013 { /* need to jump to the next word */
3014 int z;
3015 z = WORD_ALIGN - SvCUR(sv) % WORD_ALIGN;
3016 SvGROW(sv, SvCUR(sv) + z + arg * sizeof(U16) + 4);
3017 s = SvPVX(sv) + SvCUR(sv) + z;
3018 }
3019 Copy(fops, s, arg, U16);
3020 Safefree(fops);
55497cff 3021 sv_magic(sv, Nullsv, 'f', Nullch, 0);
a0d0e21e
LW
3022 SvCOMPILED_on(sv);
3023}
4e35701f 3024
745d3a65
HM
3025/*
3026 * The rest of this file was derived from source code contributed
3027 * by Tom Horsley.
3028 *
3029 * NOTE: this code was derived from Tom Horsley's qsort replacement
3030 * and should not be confused with the original code.
3031 */
3032
3033/* Copyright (C) Tom Horsley, 1997. All rights reserved.
3034
3035 Permission granted to distribute under the same terms as perl which are
3036 (briefly):
3037
3038 This program is free software; you can redistribute it and/or modify
3039 it under the terms of either:
3040
3041 a) the GNU General Public License as published by the Free
3042 Software Foundation; either version 1, or (at your option) any
3043 later version, or
3044
3045 b) the "Artistic License" which comes with this Kit.
3046
3047 Details on the perl license can be found in the perl source code which
3048 may be located via the www.perl.com web page.
3049
3050 This is the most wonderfulest possible qsort I can come up with (and
3051 still be mostly portable) My (limited) tests indicate it consistently
3052 does about 20% fewer calls to compare than does the qsort in the Visual
3053 C++ library, other vendors may vary.
3054
3055 Some of the ideas in here can be found in "Algorithms" by Sedgewick,
3056 others I invented myself (or more likely re-invented since they seemed
3057 pretty obvious once I watched the algorithm operate for a while).
3058
3059 Most of this code was written while watching the Marlins sweep the Giants
3060 in the 1997 National League Playoffs - no Braves fans allowed to use this
3061 code (just kidding :-).
3062
3063 I realize that if I wanted to be true to the perl tradition, the only
3064 comment in this file would be something like:
3065
3066 ...they shuffled back towards the rear of the line. 'No, not at the
3067 rear!' the slave-driver shouted. 'Three files up. And stay there...
3068
3069 However, I really needed to violate that tradition just so I could keep
3070 track of what happens myself, not to mention some poor fool trying to
3071 understand this years from now :-).
3072*/
3073
3074/* ********************************************************** Configuration */
3075
3076#ifndef QSORT_ORDER_GUESS
3077#define QSORT_ORDER_GUESS 2 /* Select doubling version of the netBSD trick */
3078#endif
3079
3080/* QSORT_MAX_STACK is the largest number of partitions that can be stacked up for
3081 future processing - a good max upper bound is log base 2 of memory size
3082 (32 on 32 bit machines, 64 on 64 bit machines, etc). In reality can
3083 safely be smaller than that since the program is taking up some space and
3084 most operating systems only let you grab some subset of contiguous
3085 memory (not to mention that you are normally sorting data larger than
3086 1 byte element size :-).
3087*/
3088#ifndef QSORT_MAX_STACK
3089#define QSORT_MAX_STACK 32
3090#endif
3091
3092/* QSORT_BREAK_EVEN is the size of the largest partition we should insertion sort.
3093 Anything bigger and we use qsort. If you make this too small, the qsort
3094 will probably break (or become less efficient), because it doesn't expect
3095 the middle element of a partition to be the same as the right or left -
3096 you have been warned).
3097*/
3098#ifndef QSORT_BREAK_EVEN
3099#define QSORT_BREAK_EVEN 6
3100#endif
3101
3102/* ************************************************************* Data Types */
3103
3104/* hold left and right index values of a partition waiting to be sorted (the
3105 partition includes both left and right - right is NOT one past the end or
3106 anything like that).
3107*/
3108struct partition_stack_entry {
3109 int left;
3110 int right;
3111#ifdef QSORT_ORDER_GUESS
3112 int qsort_break_even;
3113#endif
3114};
3115
3116/* ******************************************************* Shorthand Macros */
3117
3118/* Note that these macros will be used from inside the qsort function where
3119 we happen to know that the variable 'elt_size' contains the size of an
3120 array element and the variable 'temp' points to enough space to hold a
3121 temp element and the variable 'array' points to the array being sorted
3122 and 'compare' is the pointer to the compare routine.
3123
3124 Also note that there are very many highly architecture specific ways
3125 these might be sped up, but this is simply the most generally portable
3126 code I could think of.
3127*/
161b471a 3128
745d3a65
HM
3129/* Return < 0 == 0 or > 0 as the value of elt1 is < elt2, == elt2, > elt2
3130*/
565764a8
DL
3131#ifdef PERL_OBJECT
3132#define qsort_cmp(elt1, elt2) \
3133 ((this->*compare)(array[elt1], array[elt2]))
3134#else
745d3a65
HM
3135#define qsort_cmp(elt1, elt2) \
3136 ((*compare)(array[elt1], array[elt2]))
565764a8 3137#endif
745d3a65
HM
3138
3139#ifdef QSORT_ORDER_GUESS
3140#define QSORT_NOTICE_SWAP swapped++;
3141#else
3142#define QSORT_NOTICE_SWAP
3143#endif
3144
3145/* swaps contents of array elements elt1, elt2.
3146*/
3147#define qsort_swap(elt1, elt2) \
3148 STMT_START { \
3149 QSORT_NOTICE_SWAP \
3150 temp = array[elt1]; \
3151 array[elt1] = array[elt2]; \
3152 array[elt2] = temp; \
3153 } STMT_END
3154
3155/* rotate contents of elt1, elt2, elt3 such that elt1 gets elt2, elt2 gets
3156 elt3 and elt3 gets elt1.
3157*/
3158#define qsort_rotate(elt1, elt2, elt3) \
3159 STMT_START { \
3160 QSORT_NOTICE_SWAP \
3161 temp = array[elt1]; \
3162 array[elt1] = array[elt2]; \
3163 array[elt2] = array[elt3]; \
3164 array[elt3] = temp; \
3165 } STMT_END
3166
3167/* ************************************************************ Debug stuff */
3168
3169#ifdef QSORT_DEBUG
3170
3171static void
3172break_here()
3173{
3174 return; /* good place to set a breakpoint */
3175}
3176
3177#define qsort_assert(t) (void)( (t) || (break_here(), 0) )
3178
3179static void
3180doqsort_all_asserts(
3181 void * array,
3182 size_t num_elts,
3183 size_t elt_size,
3184 int (*compare)(const void * elt1, const void * elt2),
3185 int pc_left, int pc_right, int u_left, int u_right)
3186{
3187 int i;
3188
3189 qsort_assert(pc_left <= pc_right);
3190 qsort_assert(u_right < pc_left);
3191 qsort_assert(pc_right < u_left);
3192 for (i = u_right + 1; i < pc_left; ++i) {
3193 qsort_assert(qsort_cmp(i, pc_left) < 0);
3194 }
3195 for (i = pc_left; i < pc_right; ++i) {
3196 qsort_assert(qsort_cmp(i, pc_right) == 0);
3197 }
3198 for (i = pc_right + 1; i < u_left; ++i) {
3199 qsort_assert(qsort_cmp(pc_right, i) < 0);
3200 }
3201}
3202
3203#define qsort_all_asserts(PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT) \
3204 doqsort_all_asserts(array, num_elts, elt_size, compare, \
3205 PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT)
3206
3207#else
3208
3209#define qsort_assert(t) ((void)0)
3210
3211#define qsort_all_asserts(PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT) ((void)0)
3212
3213#endif
3214
3215/* ****************************************************************** qsort */
3216
6cc33c6d 3217STATIC void
565764a8
DL
3218#ifdef PERL_OBJECT
3219qsortsv(SV ** array, size_t num_elts, SVCOMPARE compare)
3220#else
745d3a65
HM
3221qsortsv(
3222 SV ** array,
3223 size_t num_elts,
3224 I32 (*compare)(SV *a, SV *b))
565764a8 3225#endif
745d3a65
HM
3226{
3227 register SV * temp;
3228
3229 struct partition_stack_entry partition_stack[QSORT_MAX_STACK];
3230 int next_stack_entry = 0;
3231
3232 int part_left;
3233 int part_right;
3234#ifdef QSORT_ORDER_GUESS
3235 int qsort_break_even;
3236 int swapped;
3237#endif
161b471a 3238
745d3a65
HM
3239 /* Make sure we actually have work to do.
3240 */
3241 if (num_elts <= 1) {
3242 return;
3243 }
3244
3245 /* Setup the initial partition definition and fall into the sorting loop
3246 */
3247 part_left = 0;
3248 part_right = (int)(num_elts - 1);
3249#ifdef QSORT_ORDER_GUESS
3250 qsort_break_even = QSORT_BREAK_EVEN;
3251#else
3252#define qsort_break_even QSORT_BREAK_EVEN
3253#endif
3254 for ( ; ; ) {
3255 if ((part_right - part_left) >= qsort_break_even) {
3256 /* OK, this is gonna get hairy, so lets try to document all the
3257 concepts and abbreviations and variables and what they keep
3258 track of:
3259
3260 pc: pivot chunk - the set of array elements we accumulate in the
3261 middle of the partition, all equal in value to the original
3262 pivot element selected. The pc is defined by:
3263
3264 pc_left - the leftmost array index of the pc
3265 pc_right - the rightmost array index of the pc
3266
3267 we start with pc_left == pc_right and only one element
3268 in the pivot chunk (but it can grow during the scan).
3269
3270 u: uncompared elements - the set of elements in the partition
3271 we have not yet compared to the pivot value. There are two
3272 uncompared sets during the scan - one to the left of the pc
3273 and one to the right.
3274
3275 u_right - the rightmost index of the left side's uncompared set
3276 u_left - the leftmost index of the right side's uncompared set
3277
3278 The leftmost index of the left sides's uncompared set
3279 doesn't need its own variable because it is always defined
3280 by the leftmost edge of the whole partition (part_left). The
3281 same goes for the rightmost edge of the right partition
3282 (part_right).
3283
3284 We know there are no uncompared elements on the left once we
3285 get u_right < part_left and no uncompared elements on the
3286 right once u_left > part_right. When both these conditions
3287 are met, we have completed the scan of the partition.
3288
3289 Any elements which are between the pivot chunk and the
3290 uncompared elements should be less than the pivot value on
3291 the left side and greater than the pivot value on the right
3292 side (in fact, the goal of the whole algorithm is to arrange
3293 for that to be true and make the groups of less-than and
3294 greater-then elements into new partitions to sort again).
3295
3296 As you marvel at the complexity of the code and wonder why it
3297 has to be so confusing. Consider some of the things this level
3298 of confusion brings:
3299
3300 Once I do a compare, I squeeze every ounce of juice out of it. I
3301 never do compare calls I don't have to do, and I certainly never
3302 do redundant calls.
3303
3304 I also never swap any elements unless I can prove there is a
3305 good reason. Many sort algorithms will swap a known value with
3306 an uncompared value just to get things in the right place (or
3307 avoid complexity :-), but that uncompared value, once it gets
3308 compared, may then have to be swapped again. A lot of the
3309 complexity of this code is due to the fact that it never swaps
3310 anything except compared values, and it only swaps them when the
3311 compare shows they are out of position.
3312 */
3313 int pc_left, pc_right;
3314 int u_right, u_left;
3315
3316 int s;
3317
3318 pc_left = ((part_left + part_right) / 2);
3319 pc_right = pc_left;
3320 u_right = pc_left - 1;
3321 u_left = pc_right + 1;
3322
3323 /* Qsort works best when the pivot value is also the median value
3324 in the partition (unfortunately you can't find the median value
3325 without first sorting :-), so to give the algorithm a helping
3326 hand, we pick 3 elements and sort them and use the median value
3327 of that tiny set as the pivot value.
3328
3329 Some versions of qsort like to use the left middle and right as
3330 the 3 elements to sort so they can insure the ends of the
3331 partition will contain values which will stop the scan in the
3332 compare loop, but when you have to call an arbitrarily complex
3333 routine to do a compare, its really better to just keep track of
3334 array index values to know when you hit the edge of the
3335 partition and avoid the extra compare. An even better reason to
3336 avoid using a compare call is the fact that you can drop off the
3337 edge of the array if someone foolishly provides you with an
3338 unstable compare function that doesn't always provide consistent
3339 results.
3340
3341 So, since it is simpler for us to compare the three adjacent
3342 elements in the middle of the partition, those are the ones we
3343 pick here (conveniently pointed at by u_right, pc_left, and
3344 u_left). The values of the left, center, and right elements
3345 are refered to as l c and r in the following comments.
3346 */
3347
3348#ifdef QSORT_ORDER_GUESS
3349 swapped = 0;
3350#endif
3351 s = qsort_cmp(u_right, pc_left);
3352 if (s < 0) {
3353 /* l < c */
3354 s = qsort_cmp(pc_left, u_left);
3355 /* if l < c, c < r - already in order - nothing to do */
3356 if (s == 0) {
3357 /* l < c, c == r - already in order, pc grows */
3358 ++pc_right;
3359 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3360 } else if (s > 0) {
3361 /* l < c, c > r - need to know more */
3362 s = qsort_cmp(u_right, u_left);
3363 if (s < 0) {
3364 /* l < c, c > r, l < r - swap c & r to get ordered */
3365 qsort_swap(pc_left, u_left);
3366 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3367 } else if (s == 0) {
3368 /* l < c, c > r, l == r - swap c&r, grow pc */
3369 qsort_swap(pc_left, u_left);
3370 --pc_left;
3371 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3372 } else {
3373 /* l < c, c > r, l > r - make lcr into rlc to get ordered */
3374 qsort_rotate(pc_left, u_right, u_left);
3375 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3376 }
3377 }
3378 } else if (s == 0) {
3379 /* l == c */
3380 s = qsort_cmp(pc_left, u_left);
3381 if (s < 0) {
3382 /* l == c, c < r - already in order, grow pc */
3383 --pc_left;
3384 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3385 } else if (s == 0) {
3386 /* l == c, c == r - already in order, grow pc both ways */
3387 --pc_left;
3388 ++pc_right;
3389 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3390 } else {
3391 /* l == c, c > r - swap l & r, grow pc */
3392 qsort_swap(u_right, u_left);
3393 ++pc_right;
3394 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3395 }
3396 } else {
3397 /* l > c */
3398 s = qsort_cmp(pc_left, u_left);
3399 if (s < 0) {
3400 /* l > c, c < r - need to know more */
3401 s = qsort_cmp(u_right, u_left);
3402 if (s < 0) {
3403 /* l > c, c < r, l < r - swap l & c to get ordered */
3404 qsort_swap(u_right, pc_left);
3405 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3406 } else if (s == 0) {
3407 /* l > c, c < r, l == r - swap l & c, grow pc */
3408 qsort_swap(u_right, pc_left);
3409 ++pc_right;
3410 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3411 } else {
3412 /* l > c, c < r, l > r - rotate lcr into crl to order */
3413 qsort_rotate(u_right, pc_left, u_left);
3414 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3415 }
3416 } else if (s == 0) {
3417 /* l > c, c == r - swap ends, grow pc */
3418 qsort_swap(u_right, u_left);
3419 --pc_left;
3420 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3421 } else {
3422 /* l > c, c > r - swap ends to get in order */
3423 qsort_swap(u_right, u_left);
3424 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3425 }
3426 }
3427 /* We now know the 3 middle elements have been compared and
3428 arranged in the desired order, so we can shrink the uncompared
3429 sets on both sides
3430 */
3431 --u_right;
3432 ++u_left;
3433 qsort_all_asserts(pc_left, pc_right, u_left, u_right);
3434
3435 /* The above massive nested if was the simple part :-). We now have
3436 the middle 3 elements ordered and we need to scan through the
3437 uncompared sets on either side, swapping elements that are on
3438 the wrong side or simply shuffling equal elements around to get
3439 all equal elements into the pivot chunk.
3440 */
3441
3442 for ( ; ; ) {
3443 int still_work_on_left;
3444 int still_work_on_right;
3445
3446 /* Scan the uncompared values on the left. If I find a value
3447 equal to the pivot value, move it over so it is adjacent to
3448 the pivot chunk and expand the pivot chunk. If I find a value
3449 less than the pivot value, then just leave it - its already
3450 on the correct side of the partition. If I find a greater
3451 value, then stop the scan.
3452 */
3453 while (still_work_on_left = (u_right >= part_left)) {
3454 s = qsort_cmp(u_right, pc_left);
3455 if (s < 0) {
3456 --u_right;
3457 } else if (s == 0) {
3458 --pc_left;
3459 if (pc_left != u_right) {
3460 qsort_swap(u_right, pc_left);
3461 }
3462 --u_right;
3463 } else {
3464 break;
3465 }
3466 qsort_assert(u_right < pc_left);
3467 qsort_assert(pc_left <= pc_right);
3468 qsort_assert(qsort_cmp(u_right + 1, pc_left) <= 0);
3469 qsort_assert(qsort_cmp(pc_left, pc_right) == 0);
3470 }
3471
3472 /* Do a mirror image scan of uncompared values on the right
3473 */
3474 while (still_work_on_right = (u_left <= part_right)) {
3475 s = qsort_cmp(pc_right, u_left);
3476 if (s < 0) {
3477 ++u_left;
3478 } else if (s == 0) {
3479 ++pc_right;
3480 if (pc_right != u_left) {
3481 qsort_swap(pc_right, u_left);
3482 }
3483 ++u_left;
3484 } else {
3485 break;
3486 }
3487 qsort_assert(u_left > pc_right);
3488 qsort_assert(pc_left <= pc_right);
3489 qsort_assert(qsort_cmp(pc_right, u_left - 1) <= 0);
3490 qsort_assert(qsort_cmp(pc_left, pc_right) == 0);
3491 }
3492
3493 if (still_work_on_left) {
3494 /* I know I have a value on the left side which needs to be
3495 on the right side, but I need to know more to decide
3496 exactly the best thing to do with it.
3497 */
3498 if (still_work_on_right) {
3499 /* I know I have values on both side which are out of
3500 position. This is a big win because I kill two birds
3501 with one swap (so to speak). I can advance the
3502 uncompared pointers on both sides after swapping both
3503 of them into the right place.
3504 */
3505 qsort_swap(u_right, u_left);
3506 --u_right;
3507 ++u_left;
3508 qsort_all_asserts(pc_left, pc_right, u_left, u_right);
3509 } else {
3510 /* I have an out of position value on the left, but the
3511 right is fully scanned, so I "slide" the pivot chunk
3512 and any less-than values left one to make room for the
3513 greater value over on the right. If the out of position
3514 value is immediately adjacent to the pivot chunk (there
3515 are no less-than values), I can do that with a swap,
3516 otherwise, I have to rotate one of the less than values
3517 into the former position of the out of position value
3518 and the right end of the pivot chunk into the left end
3519 (got all that?).
3520 */
3521 --pc_left;
3522 if (pc_left == u_right) {
3523 qsort_swap(u_right, pc_right);
3524 qsort_all_asserts(pc_left, pc_right-1, u_left, u_right-1);
3525 } else {
3526 qsort_rotate(u_right, pc_left, pc_right);
3527 qsort_all_asserts(pc_left, pc_right-1, u_left, u_right-1);
3528 }
3529 --pc_right;
3530 --u_right;
3531 }
3532 } else if (still_work_on_right) {
3533 /* Mirror image of complex case above: I have an out of
3534 position value on the right, but the left is fully
3535 scanned, so I need to shuffle things around to make room
3536 for the right value on the left.
3537 */
3538 ++pc_right;
3539 if (pc_right == u_left) {
3540 qsort_swap(u_left, pc_left);
3541 qsort_all_asserts(pc_left+1, pc_right, u_left+1, u_right);
3542 } else {
3543 qsort_rotate(pc_right, pc_left, u_left);
3544 qsort_all_asserts(pc_left+1, pc_right, u_left+1, u_right);
3545 }
3546 ++pc_left;
3547 ++u_left;
3548 } else {
3549 /* No more scanning required on either side of partition,
3550 break out of loop and figure out next set of partitions
3551 */
3552 break;
3553 }
3554 }
3555
3556 /* The elements in the pivot chunk are now in the right place. They
3557 will never move or be compared again. All I have to do is decide
3558 what to do with the stuff to the left and right of the pivot
3559 chunk.
3560
3561 Notes on the QSORT_ORDER_GUESS ifdef code:
3562
3563 1. If I just built these partitions without swapping any (or
3564 very many) elements, there is a chance that the elements are
3565 already ordered properly (being properly ordered will
3566 certainly result in no swapping, but the converse can't be
3567 proved :-).
3568
3569 2. A (properly written) insertion sort will run faster on
3570 already ordered data than qsort will.
3571
3572 3. Perhaps there is some way to make a good guess about
3573 switching to an insertion sort earlier than partition size 6
3574 (for instance - we could save the partition size on the stack
3575 and increase the size each time we find we didn't swap, thus
3576 switching to insertion sort earlier for partitions with a
3577 history of not swapping).
3578
3579 4. Naturally, if I just switch right away, it will make
3580 artificial benchmarks with pure ascending (or descending)
3581 data look really good, but is that a good reason in general?
3582 Hard to say...
3583 */
3584
3585#ifdef QSORT_ORDER_GUESS
3586 if (swapped < 3) {
3587#if QSORT_ORDER_GUESS == 1
3588 qsort_break_even = (part_right - part_left) + 1;
3589#endif
3590#if QSORT_ORDER_GUESS == 2
3591 qsort_break_even *= 2;
3592#endif
3593#if QSORT_ORDER_GUESS == 3
3594 int prev_break = qsort_break_even;
3595 qsort_break_even *= qsort_break_even;
3596 if (qsort_break_even < prev_break) {
3597 qsort_break_even = (part_right - part_left) + 1;
3598 }
3599#endif
3600 } else {
3601 qsort_break_even = QSORT_BREAK_EVEN;
3602 }
3603#endif
3604
3605 if (part_left < pc_left) {
3606 /* There are elements on the left which need more processing.
3607 Check the right as well before deciding what to do.
3608 */
3609 if (pc_right < part_right) {
3610 /* We have two partitions to be sorted. Stack the biggest one
3611 and process the smallest one on the next iteration. This
3612 minimizes the stack height by insuring that any additional
3613 stack entries must come from the smallest partition which
3614 (because it is smallest) will have the fewest
3615 opportunities to generate additional stack entries.
3616 */
3617 if ((part_right - pc_right) > (pc_left - part_left)) {
3618 /* stack the right partition, process the left */
3619 partition_stack[next_stack_entry].left = pc_right + 1;
3620 partition_stack[next_stack_entry].right = part_right;
3621#ifdef QSORT_ORDER_GUESS
3622 partition_stack[next_stack_entry].qsort_break_even = qsort_break_even;
3623#endif
3624 part_right = pc_left - 1;
3625 } else {
3626 /* stack the left partition, process the right */
3627 partition_stack[next_stack_entry].left = part_left;
3628 partition_stack[next_stack_entry].right = pc_left - 1;
3629#ifdef QSORT_ORDER_GUESS
3630 partition_stack[next_stack_entry].qsort_break_even = qsort_break_even;
3631#endif
3632 part_left = pc_right + 1;
3633 }
3634 qsort_assert(next_stack_entry < QSORT_MAX_STACK);
3635 ++next_stack_entry;
3636 } else {
3637 /* The elements on the left are the only remaining elements
3638 that need sorting, arrange for them to be processed as the
3639 next partition.
3640 */
3641 part_right = pc_left - 1;
3642 }
3643 } else if (pc_right < part_right) {
3644 /* There is only one chunk on the right to be sorted, make it
3645 the new partition and loop back around.
3646 */
3647 part_left = pc_right + 1;
3648 } else {
3649 /* This whole partition wound up in the pivot chunk, so
3650 we need to get a new partition off the stack.
3651 */
3652 if (next_stack_entry == 0) {
3653 /* the stack is empty - we are done */
3654 break;
3655 }
3656 --next_stack_entry;
3657 part_left = partition_stack[next_stack_entry].left;
3658 part_right = partition_stack[next_stack_entry].right;
3659#ifdef QSORT_ORDER_GUESS
3660 qsort_break_even = partition_stack[next_stack_entry].qsort_break_even;
3661#endif
3662 }
3663 } else {
3664 /* This partition is too small to fool with qsort complexity, just
3665 do an ordinary insertion sort to minimize overhead.
3666 */
3667 int i;
3668 /* Assume 1st element is in right place already, and start checking
3669 at 2nd element to see where it should be inserted.
3670 */
3671 for (i = part_left + 1; i <= part_right; ++i) {
3672 int j;
3673 /* Scan (backwards - just in case 'i' is already in right place)
3674 through the elements already sorted to see if the ith element
3675 belongs ahead of one of them.
3676 */
3677 for (j = i - 1; j >= part_left; --j) {
3678 if (qsort_cmp(i, j) >= 0) {
3679 /* i belongs right after j
3680 */
3681 break;
3682 }
3683 }
3684 ++j;
3685 if (j != i) {
3686 /* Looks like we really need to move some things
3687 */
b6917549 3688 int k;
745d3a65 3689 temp = array[i];
b6917549
HM
3690 for (k = i - 1; k >= j; --k)
3691 array[k + 1] = array[k];
745d3a65
HM
3692 array[j] = temp;
3693 }
3694 }
3695
3696 /* That partition is now sorted, grab the next one, or get out
3697 of the loop if there aren't any more.
3698 */
3699
3700 if (next_stack_entry == 0) {
3701 /* the stack is empty - we are done */
3702 break;
3703 }
3704 --next_stack_entry;
3705 part_left = partition_stack[next_stack_entry].left;
3706 part_right = partition_stack[next_stack_entry].right;
3707#ifdef QSORT_ORDER_GUESS
3708 qsort_break_even = partition_stack[next_stack_entry].qsort_break_even;
3709#endif
3710 }
3711 }
3712
3713 /* Believe it or not, the array is sorted at this point! */
3714}