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Describe interation of untie and DESTROY
[perl5.git] / op.c
CommitLineData
a0d0e21e 1/* op.c
79072805 2 *
a0d0e21e 3 * Copyright (c) 1991-1994, Larry Wall
79072805
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 *
a0d0e21e
LW		 8 */
9
10/*
11 * "You see: Mr. Drogo, he married poor Miss Primula Brandybuck. She was
12 * our Mr. Bilbo's first cousin on the mother's side (her mother being the
13 * youngest of the Old Took's daughters); and Mr. Drogo was his second
14 * cousin. So Mr. Frodo is his first *and* second cousin, once removed
15 * either way, as the saying is, if you follow me." --the Gaffer
79072805
LW		 16 */
17
18#include "EXTERN.h"
19#include "perl.h"
20
c07a80fd 21#define USE_OP_MASK /* Turned on by default in 5.002beta1h */
22
e50aee73
AD		 23#ifdef USE_OP_MASK
24/*
25 * In the following definition, the ", (OP *) op" is just to make the compiler
a5f75d66 26 * think the expression is of the right type: croak actually does a Siglongjmp.
e50aee73 27 */
c07a80fd 28#define CHECKOP(type,op) \
28757baa 29 ((op_mask && op_mask[type]) \
30 ? ( op_free((OP*)op), \
31 croak("%s trapped by operation mask", op_desc[type]), \
32 Nullop ) \
c07a80fd 33 : (*check[type])((OP*)op))
e50aee73
AD		 34#else
35#define CHECKOP(type,op) (*check[type])(op)
36#endif /* USE_OP_MASK */
37
a0d0e21e 38static I32 list_assignment _((OP *op));
4633a7c4 39static OP *bad_type _((I32 n, char *t, char *name, OP *kid));
a0d0e21e
LW		 40static OP *modkids _((OP *op, I32 type));
41static OP *no_fh_allowed _((OP *op));
42static OP *scalarboolean _((OP *op));
4633a7c4
LW		 43static OP *too_few_arguments _((OP *op, char* name));
44static OP *too_many_arguments _((OP *op, char* name));
a0d0e21e 45static void null _((OP* op));
bbce6d69 46static PADOFFSET pad_findlex _((char* name, PADOFFSET newoff, U32 seq,
748a9306 47 CV* startcv, I32 cx_ix));
79072805 48
4633a7c4
LW		 49static char*
50CvNAME(cv)
51CV* cv;
52{
53 SV* tmpsv = sv_newmortal();
69969c6f 54 gv_efullname3(tmpsv, CvGV(cv), Nullch);
4633a7c4
LW		 55 return SvPV(tmpsv,na);
56}
57
8990e307 58static OP *
79072805
LW		 59no_fh_allowed(op)
60OP *op;
61{
62 sprintf(tokenbuf,"Missing comma after first argument to %s function",
c07a80fd 63 op_desc[op->op_type]);
79072805
LW		 64 yyerror(tokenbuf);
65 return op;
66}
67
8990e307 68static OP *
4633a7c4
LW		 69too_few_arguments(op, name)
70OP* op;
71char* name;
79072805 72{
4633a7c4 73 sprintf(tokenbuf,"Not enough arguments for %s", name);
79072805
LW		 74 yyerror(tokenbuf);
75 return op;
76}
77
8990e307 78static OP *
4633a7c4 79too_many_arguments(op, name)
79072805 80OP *op;
4633a7c4 81char* name;
79072805 82{
4633a7c4 83 sprintf(tokenbuf,"Too many arguments for %s", name);
79072805
LW		 84 yyerror(tokenbuf);
85 return op;
86}
87
8990e307 88static OP *
4633a7c4 89bad_type(n, t, name, kid)
8990e307
LW		 90I32 n;
91char *t;
4633a7c4 92char *name;
8990e307
LW		 93OP *kid;
94{
95 sprintf(tokenbuf, "Type of arg %d to %s must be %s (not %s)",
c07a80fd 96 (int) n, name, t, op_desc[kid->op_type]);
8990e307
LW		 97 yyerror(tokenbuf);
98 return op;
99}
100
a0d0e21e
LW		 101void
102assertref(op)
103OP *op;
104{
105 int type = op->op_type;
106 if (type != OP_AELEM && type != OP_HELEM) {
c07a80fd 107 sprintf(tokenbuf, "Can't use subscript on %s", op_desc[type]);
a0d0e21e 108 yyerror(tokenbuf);
8ebc5c01 109 if (type == OP_ENTERSUB || type == OP_RV2HV || type == OP_PADHV)
748a9306 110 warn("(Did you mean $ or @ instead of %c?)\n",
8ebc5c01 111 type == OP_ENTERSUB ? '&' : '%');
a0d0e21e
LW		 112 }
113}
114
79072805
LW		 115/* "register" allocation */
116
117PADOFFSET
93a17b20
LW		 118pad_allocmy(name)
119char *name;
120{
a0d0e21e
LW		 121 PADOFFSET off;
122 SV *sv;
123
124 if (!(isALPHA(name[1]) || name[1] == '_' && (int)strlen(name) > 2)) {
bbce6d69 125 if (!isPRINT(name[1]))
126 sprintf(name+1, "^%c", toCTRL(name[1])); /* XXX tokenbuf, really */
a0d0e21e
LW		 127 croak("Can't use global %s in \"my\"",name);
128 }
b1cb66bf 129 if (AvFILL(comppad_name) >= 0) {
130 SV **svp = AvARRAY(comppad_name);
131 for (off = AvFILL(comppad_name); off > comppad_name_floor; off--) {
132 if ((sv = svp[off])
133 && sv != &sv_undef
134 && SvIVX(sv) == 999999999 /* var is in open scope */
135 && strEQ(name, SvPVX(sv)))
136 {
137 warn("\"my\" variable %s masks earlier declaration in same scope", name);
138 break;
139 }
140 }
141 }
a0d0e21e
LW		 142 off = pad_alloc(OP_PADSV, SVs_PADMY);
143 sv = NEWSV(1102,0);
93a17b20
LW		 144 sv_upgrade(sv, SVt_PVNV);
145 sv_setpv(sv, name);
8990e307 146 av_store(comppad_name, off, sv);
748a9306 147 SvNVX(sv) = (double)999999999;
8990e307
LW		 148 SvIVX(sv) = 0; /* Not yet introduced--see newSTATEOP */
149 if (!min_intro_pending)
150 min_intro_pending = off;
151 max_intro_pending = off;
93a17b20 152 if (*name == '@')
463ee0b2 153 av_store(comppad, off, (SV*)newAV());
93a17b20 154 else if (*name == '%')
463ee0b2 155 av_store(comppad, off, (SV*)newHV());
ed6116ce 156 SvPADMY_on(curpad[off]);
93a17b20
LW		 157 return off;
158}
159
748a9306 160static PADOFFSET
e9a444f0 161#ifndef CAN_PROTOTYPE
748a9306 162pad_findlex(name, newoff, seq, startcv, cx_ix)
93a17b20 163char *name;
748a9306 164PADOFFSET newoff;
bbce6d69 165U32 seq;
748a9306
LW		 166CV* startcv;
167I32 cx_ix;
e9a444f0 168#else
bbce6d69 169pad_findlex(char *name, PADOFFSET newoff, U32 seq, CV* startcv, I32 cx_ix)
e9a444f0 170#endif
93a17b20 171{
748a9306 172 CV *cv;
93a17b20
LW		 173 I32 off;
174 SV *sv;
93a17b20
LW		 175 register I32 i;
176 register CONTEXT *cx;
a0d0e21e 177 int saweval;
93a17b20 178
748a9306
LW		 179 for (cv = startcv; cv; cv = CvOUTSIDE(cv)) {
180 AV* curlist = CvPADLIST(cv);
181 SV** svp = av_fetch(curlist, 0, FALSE);
182 AV *curname;
183 if (!svp || *svp == &sv_undef)
4633a7c4 184 continue;
748a9306
LW		 185 curname = (AV*)*svp;
186 svp = AvARRAY(curname);
187 for (off = AvFILL(curname); off > 0; off--) {
188 if ((sv = svp[off]) &&
189 sv != &sv_undef &&
3841441e 190 !SvFAKE(sv) &&
748a9306 191 seq <= SvIVX(sv) &&
13826f2c 192 seq > I_32(SvNVX(sv)) &&
748a9306
LW		 193 strEQ(SvPVX(sv), name))
194 {
5f05dabc 195 I32 depth;
196 AV *oldpad;
197 SV *oldsv;
198
199 depth = CvDEPTH(cv);
200 if (!depth) {
07055b4c 201 if (newoff && !CvUNIQUE(cv))
ab50184a 202 return 0; /* don't clone inactive sub's stack frame */
5f05dabc 203 depth = 1;
204 }
205 oldpad = (AV*)*av_fetch(curlist, depth, FALSE);
206 oldsv = *av_fetch(oldpad, off, TRUE);
748a9306
LW		 207 if (!newoff) { /* Not a mere clone operation. */
208 SV *sv = NEWSV(1103,0);
209 newoff = pad_alloc(OP_PADSV, SVs_PADMY);
210 sv_upgrade(sv, SVt_PVNV);
211 sv_setpv(sv, name);
212 av_store(comppad_name, newoff, sv);
213 SvNVX(sv) = (double)curcop->cop_seq;
214 SvIVX(sv) = 999999999; /* A ref, intro immediately */
3841441e 215 SvFAKE_on(sv); /* A ref, not a real var */
774d564b 216 if (CvANON(compcv) || SvTYPE(compcv) == SVt_PVFM) {
28757baa 217 /* "It's closures all the way down." */
218 CvCLONE_on(compcv);
219 if (cv != startcv) {
220 CV *bcv;
221 for (bcv = startcv;
222 bcv && bcv != cv && !CvCLONE(bcv);
223 bcv = CvOUTSIDE(bcv)) {
224 if (CvANON(bcv))
225 CvCLONE_on(bcv);
226 else {
774d564b 227 if (dowarn && !CvUNIQUE(cv))
44a8e56a 228 warn(
229 "Variable \"%s\" may be unavailable",
28757baa 230 name);
231 break;
232 }
233 }
234 }
235 }
44a8e56a 236 else if (!CvUNIQUE(compcv)) {
28757baa 237 if (dowarn && !CvUNIQUE(cv))
44a8e56a 238 warn("Variable \"%s\" will not stay shared", name);
5f05dabc 239 }
748a9306
LW		 240 }
241 av_store(comppad, newoff, SvREFCNT_inc(oldsv));
748a9306
LW		 242 return newoff;
243 }
93a17b20
LW		 244 }
245 }
246
247 /* Nothing in current lexical context--try eval's context, if any.
248 * This is necessary to let the perldb get at lexically scoped variables.
249 * XXX This will also probably interact badly with eval tree caching.
250 */
251
a0d0e21e 252 saweval = 0;
748a9306 253 for (i = cx_ix; i >= 0; i--) {
93a17b20
LW		 254 cx = &cxstack[i];
255 switch (cx->cx_type) {
256 default:
748a9306
LW		 257 if (i == 0 && saweval) {
258 seq = cxstack[saweval].blk_oldcop->cop_seq;
259 return pad_findlex(name, newoff, seq, main_cv, 0);
260 }
93a17b20
LW		 261 break;
262 case CXt_EVAL:
44a8e56a 263 switch (cx->blk_eval.old_op_type) {
264 case OP_ENTEREVAL:
265 saweval = i;
266 break;
267 case OP_REQUIRE:
268 /* require must have its own scope */
269 return 0;
270 }
93a17b20
LW		 271 break;
272 case CXt_SUB:
273 if (!saweval)
274 return 0;
275 cv = cx->blk_sub.cv;
748a9306
LW		 276 if (debstash && CvSTASH(cv) == debstash) { /* ignore DB'* scope */
277 saweval = i; /* so we know where we were called from */
93a17b20 278 continue;
93a17b20 279 }
748a9306
LW		 280 seq = cxstack[saweval].blk_oldcop->cop_seq;
281 return pad_findlex(name, newoff, seq, cv, i-1);
93a17b20
LW		 282 }
283 }
284
748a9306
LW		 285 return 0;
286}
a0d0e21e 287
748a9306
LW		 288PADOFFSET
289pad_findmy(name)
290char *name;
291{
292 I32 off;
293 SV *sv;
294 SV **svp = AvARRAY(comppad_name);
bbce6d69 295 U32 seq = cop_seqmax;
748a9306
LW		 296
297 /* The one we're looking for is probably just before comppad_name_fill. */
4633a7c4 298 for (off = AvFILL(comppad_name); off > 0; off--) {
a0d0e21e
LW		 299 if ((sv = svp[off]) &&
300 sv != &sv_undef &&
301 seq <= SvIVX(sv) &&
13826f2c 302 seq > I_32(SvNVX(sv)) &&
a0d0e21e
LW		 303 strEQ(SvPVX(sv), name))
304 {
748a9306 305 return (PADOFFSET)off;
a0d0e21e
LW		 306 }
307 }
748a9306
LW		 308
309 /* See if it's in a nested scope */
310 off = pad_findlex(name, 0, seq, CvOUTSIDE(compcv), cxstack_ix);
311 if (off)
312 return off;
313
93a17b20
LW		 314 return 0;
315}
316
317void
318pad_leavemy(fill)
319I32 fill;
320{
321 I32 off;
8990e307 322 SV **svp = AvARRAY(comppad_name);
93a17b20 323 SV *sv;
8990e307
LW		 324 if (min_intro_pending && fill < min_intro_pending) {
325 for (off = max_intro_pending; off >= min_intro_pending; off--) {
a0d0e21e 326 if ((sv = svp[off]) && sv != &sv_undef)
8990e307
LW		 327 warn("%s never introduced", SvPVX(sv));
328 }
329 }
330 /* "Deintroduce" my variables that are leaving with this scope. */
331 for (off = AvFILL(comppad_name); off > fill; off--) {
748a9306 332 if ((sv = svp[off]) && sv != &sv_undef && SvIVX(sv) == 999999999)
463ee0b2 333 SvIVX(sv) = cop_seqmax;
93a17b20
LW		 334 }
335}
336
337PADOFFSET
79072805
LW		 338pad_alloc(optype,tmptype)
339I32 optype;
ed6116ce 340U32 tmptype;
79072805
LW		 341{
342 SV *sv;
343 I32 retval;
344
345 if (AvARRAY(comppad) != curpad)
463ee0b2 346 croak("panic: pad_alloc");
a0d0e21e
LW		 347 if (pad_reset_pending)
348 pad_reset();
ed6116ce 349 if (tmptype & SVs_PADMY) {
79072805
LW		 350 do {
351 sv = *av_fetch(comppad, AvFILL(comppad) + 1, TRUE);
ed6116ce 352 } while (SvPADBUSY(sv)); /* need a fresh one */
79072805
LW		 353 retval = AvFILL(comppad);
354 }
355 else {
bbce6d69 356 SV **names = AvARRAY(comppad_name);
357 SSize_t names_fill = AvFILL(comppad_name);
358 for (;;) {
359 /*
360 * "foreach" index vars temporarily become aliases to non-"my"
361 * values. Thus we must skip, not just pad values that are
362 * marked as current pad values, but also those with names.
363 */
364 if (++padix <= names_fill &&
365 (sv = names[padix]) && sv != &sv_undef)
366 continue;
367 sv = *av_fetch(comppad, padix, TRUE);
368 if (!(SvFLAGS(sv) & (SVs_PADTMP|SVs_PADMY)))
369 break;
370 }
79072805
LW		 371 retval = padix;
372 }
8990e307 373 SvFLAGS(sv) |= tmptype;
79072805 374 curpad = AvARRAY(comppad);
760ac839 375 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad alloc %ld for %s\n", (long) retval, op_name[optype]));
79072805
LW		 376 return (PADOFFSET)retval;
377}
378
379SV *
a0d0e21e 380#ifndef CAN_PROTOTYPE
79072805
LW		 381pad_sv(po)
382PADOFFSET po;
8990e307
LW		 383#else
384pad_sv(PADOFFSET po)
a0d0e21e 385#endif /* CAN_PROTOTYPE */
79072805
LW		 386{
387 if (!po)
463ee0b2 388 croak("panic: pad_sv po");
760ac839 389 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad sv %d\n", po));
79072805
LW		 390 return curpad[po]; /* eventually we'll turn this into a macro */
391}
392
393void
a0d0e21e 394#ifndef CAN_PROTOTYPE
79072805
LW		 395pad_free(po)
396PADOFFSET po;
8990e307
LW		 397#else
398pad_free(PADOFFSET po)
a0d0e21e 399#endif /* CAN_PROTOTYPE */
79072805 400{
a0d0e21e
LW		 401 if (!curpad)
402 return;
79072805 403 if (AvARRAY(comppad) != curpad)
463ee0b2 404 croak("panic: pad_free curpad");
79072805 405 if (!po)
463ee0b2 406 croak("panic: pad_free po");
760ac839 407 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad free %d\n", po));
a0d0e21e 408 if (curpad[po] && curpad[po] != &sv_undef)
ed6116ce 409 SvPADTMP_off(curpad[po]);
a0d0e21e 410 if ((I32)po < padix)
79072805
LW		 411 padix = po - 1;
412}
413
414void
a0d0e21e 415#ifndef CAN_PROTOTYPE
79072805
LW		 416pad_swipe(po)
417PADOFFSET po;
8990e307
LW		 418#else
419pad_swipe(PADOFFSET po)
a0d0e21e 420#endif /* CAN_PROTOTYPE */
79072805
LW		 421{
422 if (AvARRAY(comppad) != curpad)
463ee0b2 423 croak("panic: pad_swipe curpad");
79072805 424 if (!po)
463ee0b2 425 croak("panic: pad_swipe po");
760ac839 426 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad swipe %d\n", po));
ed6116ce 427 SvPADTMP_off(curpad[po]);
a0d0e21e
LW		 428 curpad[po] = NEWSV(1107,0);
429 SvPADTMP_on(curpad[po]);
430 if ((I32)po < padix)
79072805
LW		 431 padix = po - 1;
432}
433
434void
435pad_reset()
436{
437 register I32 po;
438
439 if (AvARRAY(comppad) != curpad)
463ee0b2 440 croak("panic: pad_reset curpad");
760ac839 441 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad reset\n"));
748a9306
LW		 442 if (!tainting) { /* Can't mix tainted and non-tainted temporaries. */
443 for (po = AvMAX(comppad); po > padix_floor; po--) {
444 if (curpad[po] && curpad[po] != &sv_undef)
445 SvPADTMP_off(curpad[po]);
446 }
447 padix = padix_floor;
79072805 448 }
a0d0e21e 449 pad_reset_pending = FALSE;
79072805
LW		 450}
451
452/* Destructor */
453
454void
455op_free(op)
456OP *op;
457{
85e6fe83 458 register OP *kid, *nextkid;
79072805 459
b1cb66bf 460 if (!op || op->op_seq == (U16)-1)
79072805
LW		 461 return;
462
463 if (op->op_flags & OPf_KIDS) {
85e6fe83
LW		 464 for (kid = cUNOP->op_first; kid; kid = nextkid) {
465 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 466 op_free(kid);
85e6fe83 467 }
79072805
LW		 468 }
469
79072805 470 switch (op->op_type) {
8990e307
LW		 471 case OP_NULL:
472 op->op_targ = 0; /* Was holding old type, if any. */
473 break;
a0d0e21e
LW		 474 case OP_ENTEREVAL:
475 op->op_targ = 0; /* Was holding hints. */
476 break;
a6006777 477 default:
478 if (!(op->op_flags & OPf_REF) || (check[op->op_type] != ck_ftst))
479 break;
480 /* FALL THROUGH */
463ee0b2 481 case OP_GVSV:
79072805 482 case OP_GV:
a6006777 483 case OP_AELEMFAST:
a0d0e21e 484 SvREFCNT_dec(cGVOP->op_gv);
8990e307
LW		 485 break;
486 case OP_NEXTSTATE:
487 case OP_DBSTATE:
5f05dabc 488 Safefree(cCOP->cop_label);
8990e307 489 SvREFCNT_dec(cCOP->cop_filegv);
79072805
LW		 490 break;
491 case OP_CONST:
8990e307 492 SvREFCNT_dec(cSVOP->op_sv);
79072805 493 break;
748a9306
LW		 494 case OP_GOTO:
495 case OP_NEXT:
496 case OP_LAST:
497 case OP_REDO:
498 if (op->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
499 break;
500 /* FALL THROUGH */
a0d0e21e
LW		 501 case OP_TRANS:
502 Safefree(cPVOP->op_pv);
503 break;
504 case OP_SUBST:
505 op_free(cPMOP->op_pmreplroot);
506 /* FALL THROUGH */
748a9306 507 case OP_PUSHRE:
a0d0e21e 508 case OP_MATCH:
e50aee73 509 pregfree(cPMOP->op_pmregexp);
748a9306 510 SvREFCNT_dec(cPMOP->op_pmshort);
a0d0e21e 511 break;
79072805
LW		 512 }
513
8990e307
LW		 514 if (op->op_targ > 0)
515 pad_free(op->op_targ);
516
79072805
LW		 517 Safefree(op);
518}
519
8990e307
LW		 520static void
521null(op)
522OP* op;
523{
524 if (op->op_type != OP_NULL && op->op_targ > 0)
525 pad_free(op->op_targ);
526 op->op_targ = op->op_type;
527 op->op_type = OP_NULL;
528 op->op_ppaddr = ppaddr[OP_NULL];
529}
530
79072805
LW		 531/* Contextualizers */
532
463ee0b2 533#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 534
535OP *
536linklist(op)
537OP *op;
538{
539 register OP *kid;
540
541 if (op->op_next)
542 return op->op_next;
543
544 /* establish postfix order */
545 if (cUNOP->op_first) {
546 op->op_next = LINKLIST(cUNOP->op_first);
547 for (kid = cUNOP->op_first; kid; kid = kid->op_sibling) {
548 if (kid->op_sibling)
549 kid->op_next = LINKLIST(kid->op_sibling);
550 else
551 kid->op_next = op;
552 }
553 }
554 else
555 op->op_next = op;
556
557 return op->op_next;
558}
559
560OP *
561scalarkids(op)
562OP *op;
563{
564 OP *kid;
565 if (op && op->op_flags & OPf_KIDS) {
566 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
567 scalar(kid);
568 }
569 return op;
570}
571
a0d0e21e 572static OP *
8990e307
LW		 573scalarboolean(op)
574OP *op;
575{
576 if (dowarn &&
a0d0e21e
LW		 577 op->op_type == OP_SASSIGN && cBINOP->op_first->op_type == OP_CONST) {
578 line_t oldline = curcop->cop_line;
579
580 if (copline != NOLINE)
581 curcop->cop_line = copline;
582 warn("Found = in conditional, should be ==");
583 curcop->cop_line = oldline;
584 }
8990e307
LW		 585 return scalar(op);
586}
587
588OP *
79072805
LW		 589scalar(op)
590OP *op;
591{
592 OP *kid;
593
a0d0e21e 594 /* assumes no premature commitment */
36477c24 595 if (!op || (op->op_flags & OPf_KNOW) || op->op_type == OP_RETURN
596 || error_count)
79072805
LW		 597 return op;
598
599 op->op_flags &= ~OPf_LIST;
600 op->op_flags |= OPf_KNOW;
601
602 switch (op->op_type) {
603 case OP_REPEAT:
4633a7c4
LW		 604 if (op->op_private & OPpREPEAT_DOLIST)
605 null(((LISTOP*)cBINOP->op_first)->op_first);
79072805 606 scalar(cBINOP->op_first);
8990e307 607 break;
79072805
LW		 608 case OP_OR:
609 case OP_AND:
610 case OP_COND_EXPR:
8990e307
LW		 611 for (kid = cUNOP->op_first->op_sibling; kid; kid = kid->op_sibling)
612 scalar(kid);
79072805 613 break;
a0d0e21e
LW		 614 case OP_SPLIT:
615 if ((kid = ((LISTOP*)op)->op_first) && kid->op_type == OP_PUSHRE) {
616 if (!kPMOP->op_pmreplroot)
617 deprecate("implicit split to @_");
618 }
619 /* FALL THROUGH */
79072805
LW		 620 case OP_MATCH:
621 case OP_SUBST:
622 case OP_NULL:
8990e307
LW		 623 default:
624 if (op->op_flags & OPf_KIDS) {
625 for (kid = cUNOP->op_first; kid; kid = kid->op_sibling)
626 scalar(kid);
627 }
79072805
LW		 628 break;
629 case OP_LEAVE:
630 case OP_LEAVETRY:
748a9306
LW		 631 scalar(cLISTOP->op_first);
632 /* FALL THROUGH */
633 case OP_SCOPE:
79072805 634 case OP_LINESEQ:
8990e307 635 case OP_LIST:
79072805
LW		 636 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling) {
637 if (kid->op_sibling)
638 scalarvoid(kid);
639 else
640 scalar(kid);
641 }
93a17b20 642 curcop = &compiling;
79072805
LW		 643 break;
644 }
79072805
LW		 645 return op;
646}
647
648OP *
649scalarvoid(op)
650OP *op;
651{
652 OP *kid;
8990e307
LW		 653 char* useless = 0;
654 SV* sv;
79072805 655
a0d0e21e 656 if (!op || error_count)
79072805
LW		 657 return op;
658 if (op->op_flags & OPf_LIST)
659 return op;
660
661 op->op_flags |= OPf_KNOW;
662
663 switch (op->op_type) {
664 default:
8990e307
LW		 665 if (!(opargs[op->op_type] & OA_FOLDCONST))
666 break;
36477c24 667 /* FALL THROUGH */
668 case OP_REPEAT:
8990e307
LW		 669 if (op->op_flags & OPf_STACKED)
670 break;
671 /* FALL THROUGH */
672 case OP_GVSV:
673 case OP_WANTARRAY:
674 case OP_GV:
675 case OP_PADSV:
676 case OP_PADAV:
677 case OP_PADHV:
678 case OP_PADANY:
679 case OP_AV2ARYLEN:
8990e307 680 case OP_REF:
a0d0e21e
LW		 681 case OP_REFGEN:
682 case OP_SREFGEN:
8990e307
LW		 683 case OP_DEFINED:
684 case OP_HEX:
685 case OP_OCT:
686 case OP_LENGTH:
687 case OP_SUBSTR:
688 case OP_VEC:
689 case OP_INDEX:
690 case OP_RINDEX:
691 case OP_SPRINTF:
692 case OP_AELEM:
693 case OP_AELEMFAST:
694 case OP_ASLICE:
695 case OP_VALUES:
696 case OP_KEYS:
697 case OP_HELEM:
698 case OP_HSLICE:
699 case OP_UNPACK:
700 case OP_PACK:
8990e307
LW		 701 case OP_JOIN:
702 case OP_LSLICE:
703 case OP_ANONLIST:
704 case OP_ANONHASH:
705 case OP_SORT:
706 case OP_REVERSE:
707 case OP_RANGE:
708 case OP_FLIP:
709 case OP_FLOP:
710 case OP_CALLER:
711 case OP_FILENO:
712 case OP_EOF:
713 case OP_TELL:
714 case OP_GETSOCKNAME:
715 case OP_GETPEERNAME:
716 case OP_READLINK:
717 case OP_TELLDIR:
718 case OP_GETPPID:
719 case OP_GETPGRP:
720 case OP_GETPRIORITY:
721 case OP_TIME:
722 case OP_TMS:
723 case OP_LOCALTIME:
724 case OP_GMTIME:
725 case OP_GHBYNAME:
726 case OP_GHBYADDR:
727 case OP_GHOSTENT:
728 case OP_GNBYNAME:
729 case OP_GNBYADDR:
730 case OP_GNETENT:
731 case OP_GPBYNAME:
732 case OP_GPBYNUMBER:
733 case OP_GPROTOENT:
734 case OP_GSBYNAME:
735 case OP_GSBYPORT:
736 case OP_GSERVENT:
737 case OP_GPWNAM:
738 case OP_GPWUID:
739 case OP_GGRNAM:
740 case OP_GGRGID:
741 case OP_GETLOGIN:
a0d0e21e 742 if (!(op->op_private & OPpLVAL_INTRO))
c07a80fd 743 useless = op_desc[op->op_type];
8990e307
LW		 744 break;
745
746 case OP_RV2GV:
747 case OP_RV2SV:
748 case OP_RV2AV:
749 case OP_RV2HV:
a0d0e21e 750 if (!(op->op_private & OPpLVAL_INTRO) &&
85e6fe83 751 (!op->op_sibling || op->op_sibling->op_type != OP_READLINE))
8990e307
LW		 752 useless = "a variable";
753 break;
79072805 754
93a17b20 755 case OP_NEXTSTATE:
8990e307 756 case OP_DBSTATE:
748a9306 757 curcop = ((COP*)op); /* for warning below */
93a17b20
LW		 758 break;
759
79072805 760 case OP_CONST:
8990e307
LW		 761 sv = cSVOP->op_sv;
762 if (dowarn) {
763 useless = "a constant";
764 if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
765 useless = 0;
766 else if (SvPOK(sv)) {
767 if (strnEQ(SvPVX(sv), "di", 2) ||
a0d0e21e 768 strnEQ(SvPVX(sv), "ds", 2) ||
8990e307
LW		 769 strnEQ(SvPVX(sv), "ig", 2))
770 useless = 0;
771 }
772 }
773 null(op); /* don't execute a constant */
774 SvREFCNT_dec(sv); /* don't even remember it */
79072805
LW		 775 break;
776
777 case OP_POSTINC:
8990e307 778 op->op_type = OP_PREINC; /* pre-increment is faster */
79072805
LW		 779 op->op_ppaddr = ppaddr[OP_PREINC];
780 break;
781
782 case OP_POSTDEC:
8990e307 783 op->op_type = OP_PREDEC; /* pre-decrement is faster */
79072805
LW		 784 op->op_ppaddr = ppaddr[OP_PREDEC];
785 break;
786
79072805
LW		 787 case OP_OR:
788 case OP_AND:
789 case OP_COND_EXPR:
790 for (kid = cUNOP->op_first->op_sibling; kid; kid = kid->op_sibling)
791 scalarvoid(kid);
792 break;
a0d0e21e 793 case OP_NULL:
748a9306
LW		 794 if (op->op_targ == OP_NEXTSTATE || op->op_targ == OP_DBSTATE)
795 curcop = ((COP*)op); /* for warning below */
a0d0e21e
LW		 796 if (op->op_flags & OPf_STACKED)
797 break;
79072805
LW		 798 case OP_ENTERTRY:
799 case OP_ENTER:
800 case OP_SCALAR:
79072805
LW		 801 if (!(op->op_flags & OPf_KIDS))
802 break;
463ee0b2 803 case OP_SCOPE:
79072805
LW		 804 case OP_LEAVE:
805 case OP_LEAVETRY:
a0d0e21e
LW		 806 case OP_LEAVELOOP:
807 op->op_private |= OPpLEAVE_VOID;
79072805 808 case OP_LINESEQ:
79072805 809 case OP_LIST:
79072805
LW		 810 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
811 scalarvoid(kid);
812 break;
a0d0e21e
LW		 813 case OP_SPLIT:
814 if ((kid = ((LISTOP*)op)->op_first) && kid->op_type == OP_PUSHRE) {
815 if (!kPMOP->op_pmreplroot)
816 deprecate("implicit split to @_");
817 }
818 break;
748a9306
LW		 819 case OP_DELETE:
820 op->op_private |= OPpLEAVE_VOID;
821 break;
79072805 822 }
8990e307
LW		 823 if (useless && dowarn)
824 warn("Useless use of %s in void context", useless);
79072805
LW		 825 return op;
826}
827
828OP *
829listkids(op)
830OP *op;
831{
832 OP *kid;
833 if (op && op->op_flags & OPf_KIDS) {
834 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
835 list(kid);
836 }
837 return op;
838}
839
840OP *
841list(op)
842OP *op;
843{
844 OP *kid;
845
a0d0e21e 846 /* assumes no premature commitment */
36477c24 847 if (!op || (op->op_flags & OPf_KNOW) || op->op_type == OP_RETURN
848 || error_count)
79072805
LW		 849 return op;
850
851 op->op_flags |= (OPf_KNOW | OPf_LIST);
852
853 switch (op->op_type) {
854 case OP_FLOP:
855 case OP_REPEAT:
856 list(cBINOP->op_first);
857 break;
858 case OP_OR:
859 case OP_AND:
860 case OP_COND_EXPR:
861 for (kid = cUNOP->op_first->op_sibling; kid; kid = kid->op_sibling)
862 list(kid);
863 break;
864 default:
865 case OP_MATCH:
866 case OP_SUBST:
867 case OP_NULL:
868 if (!(op->op_flags & OPf_KIDS))
869 break;
870 if (!op->op_next && cUNOP->op_first->op_type == OP_FLOP) {
871 list(cBINOP->op_first);
872 return gen_constant_list(op);
873 }
874 case OP_LIST:
875 listkids(op);
876 break;
877 case OP_LEAVE:
878 case OP_LEAVETRY:
748a9306
LW		 879 list(cLISTOP->op_first);
880 /* FALL THROUGH */
881 case OP_SCOPE:
79072805
LW		 882 case OP_LINESEQ:
883 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling) {
884 if (kid->op_sibling)
885 scalarvoid(kid);
886 else
887 list(kid);
888 }
93a17b20 889 curcop = &compiling;
79072805
LW		 890 break;
891 }
892 return op;
893}
894
895OP *
896scalarseq(op)
897OP *op;
898{
899 OP *kid;
900
463ee0b2
LW		 901 if (op) {
902 if (op->op_type == OP_LINESEQ ||
903 op->op_type == OP_SCOPE ||
79072805 904 op->op_type == OP_LEAVE ||
463ee0b2
LW		 905 op->op_type == OP_LEAVETRY)
906 {
907 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling) {
ed6116ce 908 if (kid->op_sibling) {
463ee0b2 909 scalarvoid(kid);
ed6116ce 910 }
463ee0b2
LW		 911 }
912 curcop = &compiling;
79072805 913 }
463ee0b2 914 op->op_flags &= ~OPf_PARENS;
85e6fe83 915 if (hints & HINT_BLOCK_SCOPE)
463ee0b2 916 op->op_flags |= OPf_PARENS;
79072805 917 }
8990e307
LW		 918 else
919 op = newOP(OP_STUB, 0);
79072805
LW		 920 return op;
921}
922
a0d0e21e 923static OP *
463ee0b2 924modkids(op, type)
79072805
LW		 925OP *op;
926I32 type;
927{
928 OP *kid;
929 if (op && op->op_flags & OPf_KIDS) {
930 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
463ee0b2 931 mod(kid, type);
79072805
LW		 932 }
933 return op;
934}
935
463ee0b2 936static I32 modcount;
79072805
LW		 937
938OP *
463ee0b2 939mod(op, type)
79072805
LW		 940OP *op;
941I32 type;
942{
943 OP *kid;
944 SV *sv;
945
a0d0e21e 946 if (!op || error_count)
79072805
LW		 947 return op;
948
949 switch (op->op_type) {
a0d0e21e 950 case OP_CONST:
748a9306 951 if (!(op->op_private & (OPpCONST_ARYBASE)))
a0d0e21e
LW		 952 goto nomod;
953 if (eval_start && eval_start->op_type == OP_CONST) {
954 compiling.cop_arybase = (I32)SvIV(((SVOP*)eval_start)->op_sv);
955 eval_start = 0;
956 }
957 else if (!type) {
958 SAVEI32(compiling.cop_arybase);
748a9306 959 compiling.cop_arybase = 0;
a0d0e21e
LW		 960 }
961 else if (type == OP_REFGEN)
962 goto nomod;
963 else
964 croak("That use of $[ is unsupported");
965 break;
5f05dabc 966 case OP_STUB:
967 if (op->op_flags & OPf_PARENS)
968 break;
969 goto nomod;
a0d0e21e
LW		 970 case OP_ENTERSUB:
971 if ((type == OP_UNDEF || type == OP_REFGEN) &&
972 !(op->op_flags & OPf_STACKED)) {
973 op->op_type = OP_RV2CV; /* entersub => rv2cv */
93a17b20 974 op->op_ppaddr = ppaddr[OP_RV2CV];
85e6fe83
LW		 975 assert(cUNOP->op_first->op_type == OP_NULL);
976 null(((LISTOP*)cUNOP->op_first)->op_first); /* disable pushmark */
79072805
LW		 977 break;
978 }
979 /* FALL THROUGH */
980 default:
a0d0e21e
LW		 981 nomod:
982 /* grep, foreach, subcalls, refgen */
983 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
984 break;
8990e307 985 sprintf(tokenbuf, "Can't modify %s in %s",
c07a80fd 986 op_desc[op->op_type],
987 type ? op_desc[type] : "local");
79072805
LW		 988 yyerror(tokenbuf);
989 return op;
990
a0d0e21e
LW		 991 case OP_PREINC:
992 case OP_PREDEC:
993 case OP_POW:
994 case OP_MULTIPLY:
995 case OP_DIVIDE:
996 case OP_MODULO:
997 case OP_REPEAT:
998 case OP_ADD:
999 case OP_SUBTRACT:
1000 case OP_CONCAT:
1001 case OP_LEFT_SHIFT:
1002 case OP_RIGHT_SHIFT:
1003 case OP_BIT_AND:
1004 case OP_BIT_XOR:
1005 case OP_BIT_OR:
1006 case OP_I_MULTIPLY:
1007 case OP_I_DIVIDE:
1008 case OP_I_MODULO:
1009 case OP_I_ADD:
1010 case OP_I_SUBTRACT:
1011 if (!(op->op_flags & OPf_STACKED))
1012 goto nomod;
1013 modcount++;
1014 break;
1015
79072805
LW		 1016 case OP_COND_EXPR:
1017 for (kid = cUNOP->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1018 mod(kid, type);
79072805
LW		 1019 break;
1020
1021 case OP_RV2AV:
1022 case OP_RV2HV:
748a9306
LW		 1023 if (type == OP_REFGEN && op->op_flags & OPf_PARENS) {
1024 modcount = 10000;
1025 return op; /* Treat \(@foo) like ordinary list. */
1026 }
1027 /* FALL THROUGH */
79072805 1028 case OP_RV2GV:
93a17b20 1029 ref(cUNOP->op_first, op->op_type);
79072805
LW		 1030 /* FALL THROUGH */
1031 case OP_AASSIGN:
1032 case OP_ASLICE:
1033 case OP_HSLICE:
93a17b20
LW		 1034 case OP_NEXTSTATE:
1035 case OP_DBSTATE:
a0d0e21e
LW		 1036 case OP_REFGEN:
1037 case OP_CHOMP:
463ee0b2 1038 modcount = 10000;
79072805 1039 break;
463ee0b2 1040 case OP_RV2SV:
4633a7c4
LW		 1041 if (!type && cUNOP->op_first->op_type != OP_GV)
1042 croak("Can't localize a reference");
8990e307 1043 ref(cUNOP->op_first, op->op_type);
463ee0b2 1044 /* FALL THROUGH */
79072805
LW		 1045 case OP_UNDEF:
1046 case OP_GV:
463ee0b2
LW		 1047 case OP_AV2ARYLEN:
1048 case OP_SASSIGN:
8990e307
LW		 1049 case OP_AELEMFAST:
1050 modcount++;
1051 break;
1052
748a9306
LW		 1053 case OP_PADAV:
1054 case OP_PADHV:
1055 modcount = 10000;
58e0a6ae
GS		 1056 if (type == OP_REFGEN && op->op_flags & OPf_PARENS)
1057 return op; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1058 /* FALL THROUGH */
1059 case OP_PADSV:
1060 modcount++;
1061 if (!type)
1062 croak("Can't localize lexical variable %s",
1063 SvPV(*av_fetch(comppad_name, op->op_targ, 4), na));
463ee0b2
LW		 1064 break;
1065
748a9306
LW		 1066 case OP_PUSHMARK:
1067 break;
a0d0e21e 1068
69969c6f
SB		 1069 case OP_KEYS:
1070 if (type != OP_SASSIGN)
1071 goto nomod;
5f05dabc 1072 /* FALL THROUGH */
a0d0e21e 1073 case OP_POS:
463ee0b2 1074 case OP_VEC:
a0d0e21e 1075 case OP_SUBSTR:
8990e307 1076 pad_free(op->op_targ);
ed6116ce 1077 op->op_targ = pad_alloc(op->op_type, SVs_PADMY);
5f05dabc 1078 assert(SvTYPE(PAD_SV(op->op_targ)) == SVt_NULL);
8990e307 1079 if (op->op_flags & OPf_KIDS)
4633a7c4 1080 mod(cBINOP->op_first->op_sibling, type);
463ee0b2 1081 break;
a0d0e21e 1082
463ee0b2
LW		 1083 case OP_AELEM:
1084 case OP_HELEM:
8990e307 1085 ref(cBINOP->op_first, op->op_type);
a0d0e21e 1086 modcount++;
463ee0b2
LW		 1087 break;
1088
1089 case OP_SCOPE:
1090 case OP_LEAVE:
1091 case OP_ENTER:
a0d0e21e
LW		 1092 if (op->op_flags & OPf_KIDS)
1093 mod(cLISTOP->op_last, type);
1094 break;
1095
1096 case OP_NULL:
463ee0b2
LW		 1097 if (!(op->op_flags & OPf_KIDS))
1098 break;
a0d0e21e
LW		 1099 if (op->op_targ != OP_LIST) {
1100 mod(cBINOP->op_first, type);
1101 break;
1102 }
1103 /* FALL THROUGH */
463ee0b2
LW		 1104 case OP_LIST:
1105 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
1106 mod(kid, type);
1107 break;
1108 }
a0d0e21e
LW		 1109 op->op_flags |= OPf_MOD;
1110
1111 if (type == OP_AASSIGN || type == OP_SASSIGN)
1112 op->op_flags |= OPf_SPECIAL|OPf_REF;
1113 else if (!type) {
1114 op->op_private |= OPpLVAL_INTRO;
463ee0b2 1115 op->op_flags &= ~OPf_SPECIAL;
463ee0b2 1116 }
a0d0e21e
LW		 1117 else if (type != OP_GREPSTART && type != OP_ENTERSUB)
1118 op->op_flags |= OPf_REF;
463ee0b2
LW		 1119 return op;
1120}
1121
1122OP *
1123refkids(op, type)
1124OP *op;
1125I32 type;
1126{
1127 OP *kid;
1128 if (op && op->op_flags & OPf_KIDS) {
1129 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
1130 ref(kid, type);
1131 }
1132 return op;
1133}
1134
1135OP *
1136ref(op, type)
1137OP *op;
1138I32 type;
1139{
1140 OP *kid;
463ee0b2 1141
a0d0e21e 1142 if (!op || error_count)
463ee0b2
LW		 1143 return op;
1144
1145 switch (op->op_type) {
a0d0e21e
LW		 1146 case OP_ENTERSUB:
1147 if ((type == OP_DEFINED) &&
1148 !(op->op_flags & OPf_STACKED)) {
1149 op->op_type = OP_RV2CV; /* entersub => rv2cv */
8990e307 1150 op->op_ppaddr = ppaddr[OP_RV2CV];
85e6fe83
LW		 1151 assert(cUNOP->op_first->op_type == OP_NULL);
1152 null(((LISTOP*)cUNOP->op_first)->op_first); /* disable pushmark */
4633a7c4 1153 op->op_flags |= OPf_SPECIAL;
8990e307
LW		 1154 }
1155 break;
1156
463ee0b2
LW		 1157 case OP_COND_EXPR:
1158 for (kid = cUNOP->op_first->op_sibling; kid; kid = kid->op_sibling)
1159 ref(kid, type);
1160 break;
8990e307 1161 case OP_RV2SV:
8990e307 1162 ref(cUNOP->op_first, op->op_type);
4633a7c4
LW		 1163 /* FALL THROUGH */
1164 case OP_PADSV:
5f05dabc 1165 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
1166 op->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1167 : type == OP_RV2HV ? OPpDEREF_HV
1168 : OPpDEREF_SV);
a0d0e21e
LW		 1169 op->op_flags |= OPf_MOD;
1170 }
8990e307
LW		 1171 break;
1172
463ee0b2
LW		 1173 case OP_RV2AV:
1174 case OP_RV2HV:
a0d0e21e 1175 op->op_flags |= OPf_REF;
8990e307 1176 /* FALL THROUGH */
463ee0b2
LW		 1177 case OP_RV2GV:
1178 ref(cUNOP->op_first, op->op_type);
463ee0b2 1179 break;
8990e307 1180
463ee0b2
LW		 1181 case OP_PADAV:
1182 case OP_PADHV:
a0d0e21e 1183 op->op_flags |= OPf_REF;
79072805 1184 break;
8990e307
LW		 1185
1186 case OP_SCALAR:
79072805
LW		 1187 case OP_NULL:
1188 if (!(op->op_flags & OPf_KIDS))
463ee0b2 1189 break;
8990e307 1190 ref(cBINOP->op_first, type);
79072805
LW		 1191 break;
1192 case OP_AELEM:
1193 case OP_HELEM:
8990e307 1194 ref(cBINOP->op_first, op->op_type);
5f05dabc 1195 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
1196 op->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1197 : type == OP_RV2HV ? OPpDEREF_HV
1198 : OPpDEREF_SV);
a0d0e21e 1199 op->op_flags |= OPf_MOD;
8990e307 1200 }
79072805
LW		 1201 break;
1202
463ee0b2 1203 case OP_SCOPE:
79072805
LW		 1204 case OP_LEAVE:
1205 case OP_ENTER:
8990e307 1206 case OP_LIST:
79072805
LW		 1207 if (!(op->op_flags & OPf_KIDS))
1208 break;
8990e307 1209 ref(cLISTOP->op_last, type);
79072805 1210 break;
a0d0e21e
LW		 1211 default:
1212 break;
79072805 1213 }
8990e307
LW		 1214 return scalar(op);
1215
79072805
LW		 1216}
1217
1218OP *
93a17b20
LW		 1219my(op)
1220OP *op;
1221{
1222 OP *kid;
93a17b20
LW		 1223 I32 type;
1224
a0d0e21e 1225 if (!op || error_count)
93a17b20
LW		 1226 return op;
1227
1228 type = op->op_type;
1229 if (type == OP_LIST) {
1230 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
1231 my(kid);
1232 }
1233 else if (type != OP_PADSV &&
1234 type != OP_PADAV &&
1235 type != OP_PADHV &&
1236 type != OP_PUSHMARK)
1237 {
c07a80fd 1238 sprintf(tokenbuf, "Can't declare %s in my", op_desc[op->op_type]);
93a17b20
LW		 1239 yyerror(tokenbuf);
1240 return op;
1241 }
a0d0e21e
LW		 1242 op->op_flags |= OPf_MOD;
1243 op->op_private |= OPpLVAL_INTRO;
93a17b20
LW		 1244 return op;
1245}
1246
1247OP *
79072805
LW		 1248sawparens(o)
1249OP *o;
1250{
1251 if (o)
1252 o->op_flags |= OPf_PARENS;
1253 return o;
1254}
1255
1256OP *
1257bind_match(type, left, right)
1258I32 type;
1259OP *left;
1260OP *right;
1261{
1262 OP *op;
1263
1264 if (right->op_type == OP_MATCH ||
1265 right->op_type == OP_SUBST ||
1266 right->op_type == OP_TRANS) {
1267 right->op_flags |= OPf_STACKED;
1268 if (right->op_type != OP_MATCH)
463ee0b2 1269 left = mod(left, right->op_type);
79072805 1270 if (right->op_type == OP_TRANS)
a0d0e21e 1271 op = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805
LW		 1272 else
1273 op = prepend_elem(right->op_type, scalar(left), right);
1274 if (type == OP_NOT)
1275 return newUNOP(OP_NOT, 0, scalar(op));
1276 return op;
1277 }
1278 else
1279 return bind_match(type, left,
1280 pmruntime(newPMOP(OP_MATCH, 0), right, Nullop));
1281}
1282
1283OP *
1284invert(op)
1285OP *op;
1286{
1287 if (!op)
1288 return op;
1289 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
1290 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(op));
1291}
1292
1293OP *
1294scope(o)
1295OP *o;
1296{
1297 if (o) {
4633a7c4 1298 if (o->op_flags & OPf_PARENS || perldb || tainting) {
463ee0b2
LW		 1299 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1300 o->op_type = OP_LEAVE;
1301 o->op_ppaddr = ppaddr[OP_LEAVE];
1302 }
1303 else {
1304 if (o->op_type == OP_LINESEQ) {
1305 OP *kid;
1306 o->op_type = OP_SCOPE;
1307 o->op_ppaddr = ppaddr[OP_SCOPE];
1308 kid = ((LISTOP*)o)->op_first;
748a9306
LW		 1309 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE){
1310 SvREFCNT_dec(((COP*)kid)->cop_filegv);
8990e307 1311 null(kid);
748a9306 1312 }
463ee0b2
LW		 1313 }
1314 else
748a9306 1315 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
463ee0b2 1316 }
79072805
LW		 1317 }
1318 return o;
1319}
1320
a0d0e21e 1321int
55497cff 1322block_start(full)
1323int full;
79072805 1324{
a0d0e21e 1325 int retval = savestack_ix;
55497cff 1326 SAVEI32(comppad_name_floor);
1327 if (full) {
1328 if ((comppad_name_fill = AvFILL(comppad_name)) > 0)
1329 comppad_name_floor = comppad_name_fill;
1330 else
1331 comppad_name_floor = 0;
1332 }
1333 SAVEI32(min_intro_pending);
1334 SAVEI32(max_intro_pending);
a0d0e21e 1335 min_intro_pending = 0;
55497cff 1336 SAVEI32(comppad_name_fill);
1337 SAVEI32(padix_floor);
a0d0e21e
LW		 1338 padix_floor = padix;
1339 pad_reset_pending = FALSE;
55497cff 1340 SAVEI32(hints);
a0d0e21e
LW		 1341 hints &= ~HINT_BLOCK_SCOPE;
1342 return retval;
1343}
1344
1345OP*
36477c24 1346block_end(floor, seq)
1347I32 floor;
a0d0e21e
LW		 1348OP* seq;
1349{
1350 int needblockscope = hints & HINT_BLOCK_SCOPE;
1351 OP* retval = scalarseq(seq);
a0d0e21e
LW		 1352 LEAVE_SCOPE(floor);
1353 pad_reset_pending = FALSE;
1354 if (needblockscope)
1355 hints |= HINT_BLOCK_SCOPE; /* propagate out */
1356 pad_leavemy(comppad_name_fill);
bbce6d69 1357 cop_seqmax++;
a0d0e21e
LW		 1358 return retval;
1359}
1360
1361void
1362newPROG(op)
1363OP *op;
1364{
1365 if (in_eval) {
b1cb66bf 1366 eval_root = newUNOP(OP_LEAVEEVAL, ((in_eval & 4) ? OPf_SPECIAL : 0), op);
a0d0e21e
LW		 1367 eval_start = linklist(eval_root);
1368 eval_root->op_next = 0;
1369 peep(eval_start);
1370 }
1371 else {
1372 if (!op) {
1373 main_start = 0;
1374 return;
1375 }
1376 main_root = scope(sawparens(scalarvoid(op)));
1377 curcop = &compiling;
1378 main_start = LINKLIST(main_root);
1379 main_root->op_next = 0;
1380 peep(main_start);
748a9306
LW		 1381 main_cv = compcv;
1382 compcv = 0;
3841441e
CS		 1383 /* Register with debugger: */
1384
1385 if (perldb) {
1386 CV *cv = perl_get_cv("DB::postponed", FALSE);
1387
1388 if (cv) {
1389 dSP;
1390 PUSHMARK(sp);
1391 XPUSHs((SV*)compiling.cop_filegv);
1392 PUTBACK;
1393 perl_call_sv((SV*)cv, G_DISCARD);
1394 }
1395 }
79072805 1396 }
79072805
LW		 1397}
1398
1399OP *
93a17b20 1400localize(o, lex)
79072805 1401OP *o;
93a17b20 1402I32 lex;
79072805
LW		 1403{
1404 if (o->op_flags & OPf_PARENS)
1405 list(o);
8990e307 1406 else {
79072805 1407 scalar(o);
8990e307
LW		 1408 if (dowarn && bufptr > oldbufptr && bufptr[-1] == ',') {
1409 char *s;
1410 for (s = bufptr; *s && (isALNUM(*s) || strchr("@$%, ",*s)); s++) ;
a0d0e21e 1411 if (*s == ';' || *s == '=')
8990e307
LW		 1412 warn("Parens missing around \"%s\" list", lex ? "my" : "local");
1413 }
1414 }
93a17b20
LW		 1415 in_my = FALSE;
1416 if (lex)
1417 return my(o);
1418 else
463ee0b2 1419 return mod(o, OP_NULL); /* a bit kludgey */
79072805
LW		 1420}
1421
1422OP *
1423jmaybe(o)
1424OP *o;
1425{
1426 if (o->op_type == OP_LIST) {
1427 o = convert(OP_JOIN, 0,
1428 prepend_elem(OP_LIST,
85e6fe83 1429 newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
79072805
LW		 1430 o));
1431 }
1432 return o;
1433}
1434
1435OP *
1436fold_constants(o)
1437register OP *o;
1438{
1439 register OP *curop;
1440 I32 type = o->op_type;
748a9306 1441 SV *sv;
79072805
LW		 1442
1443 if (opargs[type] & OA_RETSCALAR)
1444 scalar(o);
1445 if (opargs[type] & OA_TARGET)
ed6116ce 1446 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 1447
85e6fe83 1448 if ((opargs[type] & OA_OTHERINT) && (hints & HINT_INTEGER))
a0d0e21e 1449 o->op_ppaddr = ppaddr[type = ++(o->op_type)];
85e6fe83 1450
79072805
LW		 1451 if (!(opargs[type] & OA_FOLDCONST))
1452 goto nope;
1453
a0d0e21e
LW		 1454 if (error_count)
1455 goto nope; /* Don't try to run w/ errors */
1456
79072805 1457 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
93a17b20
LW		 1458 if (curop->op_type != OP_CONST &&
1459 curop->op_type != OP_LIST &&
1460 curop->op_type != OP_SCALAR &&
a0d0e21e 1461 curop->op_type != OP_NULL &&
93a17b20 1462 curop->op_type != OP_PUSHMARK) {
79072805
LW		 1463 goto nope;
1464 }
1465 }
1466
1467 curop = LINKLIST(o);
1468 o->op_next = 0;
1469 op = curop;
8da795c6 1470 runops();
748a9306
LW		 1471 sv = *(stack_sp--);
1472 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
79072805 1473 pad_swipe(o->op_targ);
748a9306
LW		 1474 else if (SvTEMP(sv)) { /* grab mortal temp? */
1475 (void)SvREFCNT_inc(sv);
1476 SvTEMP_off(sv);
85e6fe83 1477 }
79072805
LW		 1478 op_free(o);
1479 if (type == OP_RV2GV)
b1cb66bf 1480 return newGVOP(OP_GV, 0, (GV*)sv);
748a9306
LW		 1481 else {
1482 if ((SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK)) == SVf_NOK) {
1483 IV iv = SvIV(sv);
1484 if ((double)iv == SvNV(sv)) { /* can we smush double to int */
1485 SvREFCNT_dec(sv);
1486 sv = newSViv(iv);
1487 }
b1cb66bf 1488 else
1489 SvIOK_off(sv); /* undo SvIV() damage */
748a9306
LW		 1490 }
1491 return newSVOP(OP_CONST, 0, sv);
1492 }
79072805
LW		 1493
1494 nope:
1495 if (!(opargs[type] & OA_OTHERINT))
1496 return o;
79072805 1497
85e6fe83 1498 if (!(hints & HINT_INTEGER)) {
a0d0e21e 1499 if (type == OP_DIVIDE || !(o->op_flags & OPf_KIDS))
85e6fe83
LW		 1500 return o;
1501
1502 for (curop = ((UNOP*)o)->op_first; curop; curop = curop->op_sibling) {
1503 if (curop->op_type == OP_CONST) {
b1cb66bf 1504 if (SvIOK(((SVOP*)curop)->op_sv))
85e6fe83
LW		 1505 continue;
1506 return o;
1507 }
1508 if (opargs[curop->op_type] & OA_RETINTEGER)
79072805
LW		 1509 continue;
1510 return o;
1511 }
a0d0e21e 1512 o->op_ppaddr = ppaddr[++(o->op_type)];
79072805
LW		 1513 }
1514
79072805
LW		 1515 return o;
1516}
1517
1518OP *
1519gen_constant_list(o)
1520register OP *o;
1521{
1522 register OP *curop;
79072805 1523 I32 oldtmps_floor = tmps_floor;
79072805 1524
a0d0e21e
LW		 1525 list(o);
1526 if (error_count)
1527 return o; /* Don't attempt to run with errors */
1528
1529 op = curop = LINKLIST(o);
1530 o->op_next = 0;
1531 pp_pushmark();
8da795c6 1532 runops();
a0d0e21e
LW		 1533 op = curop;
1534 pp_anonlist();
79072805 1535 tmps_floor = oldtmps_floor;
79072805
LW		 1536
1537 o->op_type = OP_RV2AV;
1538 o->op_ppaddr = ppaddr[OP_RV2AV];
79072805 1539 curop = ((UNOP*)o)->op_first;
a0d0e21e 1540 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*stack_sp--));
79072805 1541 op_free(curop);
79072805
LW		 1542 linklist(o);
1543 return list(o);
1544}
1545
1546OP *
1547convert(type, flags, op)
1548I32 type;
1549I32 flags;
1550OP* op;
1551{
1552 OP *kid;
a0d0e21e 1553 OP *last = 0;
79072805 1554
79072805
LW		 1555 if (!op || op->op_type != OP_LIST)
1556 op = newLISTOP(OP_LIST, 0, op, Nullop);
748a9306
LW		 1557 else
1558 op->op_flags &= ~(OPf_KNOW|OPf_LIST);
79072805 1559
8990e307
LW		 1560 if (!(opargs[type] & OA_MARK))
1561 null(cLISTOP->op_first);
1562
79072805
LW		 1563 op->op_type = type;
1564 op->op_ppaddr = ppaddr[type];
1565 op->op_flags |= flags;
1566
e50aee73 1567 op = CHECKOP(type, op);
79072805
LW		 1568 if (op->op_type != type)
1569 return op;
1570
1571 if (cLISTOP->op_children < 7) {
1572 /* XXX do we really need to do this if we're done appending?? */
1573 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
1574 last = kid;
1575 cLISTOP->op_last = last; /* in case check substituted last arg */
1576 }
1577
1578 return fold_constants(op);
1579}
1580
1581/* List constructors */
1582
1583OP *
1584append_elem(type, first, last)
1585I32 type;
1586OP* first;
1587OP* last;
1588{
1589 if (!first)
1590 return last;
8990e307
LW		 1591
1592 if (!last)
79072805 1593 return first;
8990e307 1594
a0d0e21e
LW		 1595 if (first->op_type != type || type==OP_LIST && first->op_flags & OPf_PARENS)
1596 return newLISTOP(type, 0, first, last);
79072805 1597
a0d0e21e
LW		 1598 if (first->op_flags & OPf_KIDS)
1599 ((LISTOP*)first)->op_last->op_sibling = last;
1600 else {
1601 first->op_flags |= OPf_KIDS;
1602 ((LISTOP*)first)->op_first = last;
1603 }
1604 ((LISTOP*)first)->op_last = last;
1605 ((LISTOP*)first)->op_children++;
1606 return first;
79072805
LW		 1607}
1608
1609OP *
1610append_list(type, first, last)
1611I32 type;
1612LISTOP* first;
1613LISTOP* last;
1614{
1615 if (!first)
1616 return (OP*)last;
8990e307
LW		 1617
1618 if (!last)
79072805 1619 return (OP*)first;
8990e307
LW		 1620
1621 if (first->op_type != type)
79072805 1622 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307
LW		 1623
1624 if (last->op_type != type)
79072805
LW		 1625 return append_elem(type, (OP*)first, (OP*)last);
1626
1627 first->op_last->op_sibling = last->op_first;
1628 first->op_last = last->op_last;
1629 first->op_children += last->op_children;
1630 if (first->op_children)
1631 last->op_flags |= OPf_KIDS;
1632
1633 Safefree(last);
1634 return (OP*)first;
1635}
1636
1637OP *
1638prepend_elem(type, first, last)
1639I32 type;
1640OP* first;
1641OP* last;
1642{
1643 if (!first)
1644 return last;
8990e307
LW		 1645
1646 if (!last)
79072805 1647 return first;
8990e307
LW		 1648
1649 if (last->op_type == type) {
1650 if (type == OP_LIST) { /* already a PUSHMARK there */
1651 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
1652 ((LISTOP*)last)->op_first->op_sibling = first;
1653 }
1654 else {
1655 if (!(last->op_flags & OPf_KIDS)) {
1656 ((LISTOP*)last)->op_last = first;
1657 last->op_flags |= OPf_KIDS;
1658 }
1659 first->op_sibling = ((LISTOP*)last)->op_first;
1660 ((LISTOP*)last)->op_first = first;
79072805 1661 }
79072805
LW		 1662 ((LISTOP*)last)->op_children++;
1663 return last;
1664 }
1665
1666 return newLISTOP(type, 0, first, last);
1667}
1668
1669/* Constructors */
1670
1671OP *
1672newNULLLIST()
1673{
8990e307
LW		 1674 return newOP(OP_STUB, 0);
1675}
1676
1677OP *
1678force_list(op)
1679OP* op;
1680{
1681 if (!op || op->op_type != OP_LIST)
1682 op = newLISTOP(OP_LIST, 0, op, Nullop);
1683 null(op);
1684 return op;
79072805
LW		 1685}
1686
1687OP *
1688newLISTOP(type, flags, first, last)
1689I32 type;
1690I32 flags;
1691OP* first;
1692OP* last;
1693{
1694 LISTOP *listop;
1695
1696 Newz(1101, listop, 1, LISTOP);
1697
1698 listop->op_type = type;
1699 listop->op_ppaddr = ppaddr[type];
1700 listop->op_children = (first != 0) + (last != 0);
1701 listop->op_flags = flags;
79072805
LW		 1702
1703 if (!last && first)
1704 last = first;
1705 else if (!first && last)
1706 first = last;
8990e307
LW		 1707 else if (first)
1708 first->op_sibling = last;
79072805
LW		 1709 listop->op_first = first;
1710 listop->op_last = last;
8990e307
LW		 1711 if (type == OP_LIST) {
1712 OP* pushop;
1713 pushop = newOP(OP_PUSHMARK, 0);
1714 pushop->op_sibling = first;
1715 listop->op_first = pushop;
1716 listop->op_flags |= OPf_KIDS;
1717 if (!last)
1718 listop->op_last = pushop;
1719 }
1720 else if (listop->op_children)
1721 listop->op_flags |= OPf_KIDS;
79072805
LW		 1722
1723 return (OP*)listop;
1724}
1725
1726OP *
1727newOP(type, flags)
1728I32 type;
1729I32 flags;
1730{
1731 OP *op;
1732 Newz(1101, op, 1, OP);
1733 op->op_type = type;
1734 op->op_ppaddr = ppaddr[type];
1735 op->op_flags = flags;
1736
1737 op->op_next = op;
c07a80fd 1738 op->op_private = 0 + (flags >> 8);
79072805
LW		 1739 if (opargs[type] & OA_RETSCALAR)
1740 scalar(op);
1741 if (opargs[type] & OA_TARGET)
ed6116ce 1742 op->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 1743 return CHECKOP(type, op);
79072805
LW		 1744}
1745
1746OP *
1747newUNOP(type, flags, first)
1748I32 type;
1749I32 flags;
1750OP* first;
1751{
1752 UNOP *unop;
1753
93a17b20
LW		 1754 if (!first)
1755 first = newOP(OP_STUB, 0);
8990e307
LW		 1756 if (opargs[type] & OA_MARK)
1757 first = force_list(first);
93a17b20 1758
79072805
LW		 1759 Newz(1101, unop, 1, UNOP);
1760 unop->op_type = type;
1761 unop->op_ppaddr = ppaddr[type];
1762 unop->op_first = first;
1763 unop->op_flags = flags | OPf_KIDS;
c07a80fd 1764 unop->op_private = 1 | (flags >> 8);
79072805 1765
e50aee73 1766 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 1767 if (unop->op_next)
1768 return (OP*)unop;
1769
a0d0e21e 1770 return fold_constants((OP *) unop);
79072805
LW		 1771}
1772
1773OP *
1774newBINOP(type, flags, first, last)
1775I32 type;
1776I32 flags;
1777OP* first;
1778OP* last;
1779{
1780 BINOP *binop;
1781 Newz(1101, binop, 1, BINOP);
1782
1783 if (!first)
1784 first = newOP(OP_NULL, 0);
1785
1786 binop->op_type = type;
1787 binop->op_ppaddr = ppaddr[type];
1788 binop->op_first = first;
1789 binop->op_flags = flags | OPf_KIDS;
1790 if (!last) {
1791 last = first;
c07a80fd 1792 binop->op_private = 1 | (flags >> 8);
79072805
LW		 1793 }
1794 else {
c07a80fd 1795 binop->op_private = 2 | (flags >> 8);
79072805
LW		 1796 first->op_sibling = last;
1797 }
1798
e50aee73 1799 binop = (BINOP*)CHECKOP(type, binop);
79072805
LW		 1800 if (binop->op_next)
1801 return (OP*)binop;
1802
1803 binop->op_last = last = binop->op_first->op_sibling;
1804
a0d0e21e 1805 return fold_constants((OP *)binop);
79072805
LW		 1806}
1807
1808OP *
1809pmtrans(op, expr, repl)
1810OP *op;
1811OP *expr;
1812OP *repl;
1813{
79072805
LW		 1814 SV *tstr = ((SVOP*)expr)->op_sv;
1815 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 1816 STRLEN tlen;
1817 STRLEN rlen;
ec49126f 1818 register U8 *t = (U8*)SvPV(tstr, tlen);
1819 register U8 *r = (U8*)SvPV(rstr, rlen);
79072805
LW		 1820 register I32 i;
1821 register I32 j;
79072805
LW		 1822 I32 delete;
1823 I32 complement;
1824 register short *tbl;
1825
1826 tbl = (short*)cPVOP->op_pv;
1827 complement = op->op_private & OPpTRANS_COMPLEMENT;
1828 delete = op->op_private & OPpTRANS_DELETE;
748a9306 1829 /* squash = op->op_private & OPpTRANS_SQUASH; */
79072805
LW		 1830
1831 if (complement) {
1832 Zero(tbl, 256, short);
1833 for (i = 0; i < tlen; i++)
ec49126f 1834 tbl[t[i]] = -1;
79072805
LW		 1835 for (i = 0, j = 0; i < 256; i++) {
1836 if (!tbl[i]) {
1837 if (j >= rlen) {
1838 if (delete)
1839 tbl[i] = -2;
1840 else if (rlen)
ec49126f 1841 tbl[i] = r[j-1];
79072805
LW		 1842 else
1843 tbl[i] = i;
1844 }
1845 else
ec49126f 1846 tbl[i] = r[j++];
79072805
LW		 1847 }
1848 }
1849 }
1850 else {
1851 if (!rlen && !delete) {
1852 r = t; rlen = tlen;
1853 }
1854 for (i = 0; i < 256; i++)
1855 tbl[i] = -1;
1856 for (i = 0, j = 0; i < tlen; i++,j++) {
1857 if (j >= rlen) {
1858 if (delete) {
ec49126f 1859 if (tbl[t[i]] == -1)
1860 tbl[t[i]] = -2;
79072805
LW		 1861 continue;
1862 }
1863 --j;
1864 }
ec49126f 1865 if (tbl[t[i]] == -1)
1866 tbl[t[i]] = r[j];
79072805
LW		 1867 }
1868 }
1869 op_free(expr);
1870 op_free(repl);
1871
1872 return op;
1873}
1874
1875OP *
1876newPMOP(type, flags)
1877I32 type;
1878I32 flags;
1879{
1880 PMOP *pmop;
1881
1882 Newz(1101, pmop, 1, PMOP);
1883 pmop->op_type = type;
1884 pmop->op_ppaddr = ppaddr[type];
1885 pmop->op_flags = flags;
c07a80fd 1886 pmop->op_private = 0 | (flags >> 8);
79072805 1887
36477c24 1888 if (hints & HINT_LOCALE)
1889 pmop->op_pmpermflags = (pmop->op_pmflags |= PMf_LOCALE);
1890
79072805 1891 /* link into pm list */
a0d0e21e 1892 if (type != OP_TRANS && curstash) {
79072805
LW		 1893 pmop->op_pmnext = HvPMROOT(curstash);
1894 HvPMROOT(curstash) = pmop;
1895 }
1896
1897 return (OP*)pmop;
1898}
1899
1900OP *
1901pmruntime(op, expr, repl)
1902OP *op;
1903OP *expr;
1904OP *repl;
1905{
1906 PMOP *pm;
1907 LOGOP *rcop;
1908
1909 if (op->op_type == OP_TRANS)
1910 return pmtrans(op, expr, repl);
1911
1912 pm = (PMOP*)op;
1913
1914 if (expr->op_type == OP_CONST) {
463ee0b2 1915 STRLEN plen;
79072805 1916 SV *pat = ((SVOP*)expr)->op_sv;
463ee0b2 1917 char *p = SvPV(pat, plen);
79072805 1918 if ((op->op_flags & OPf_SPECIAL) && strEQ(p, " ")) {
93a17b20 1919 sv_setpvn(pat, "\\s+", 3);
463ee0b2 1920 p = SvPV(pat, plen);
79072805
LW		 1921 pm->op_pmflags |= PMf_SKIPWHITE;
1922 }
e50aee73 1923 pm->op_pmregexp = pregcomp(p, p + plen, pm);
85e6fe83
LW		 1924 if (strEQ("\\s+", pm->op_pmregexp->precomp))
1925 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 1926 hoistmust(pm);
1927 op_free(expr);
1928 }
1929 else {
463ee0b2
LW		 1930 if (pm->op_pmflags & PMf_KEEP)
1931 expr = newUNOP(OP_REGCMAYBE,0,expr);
1932
79072805
LW		 1933 Newz(1101, rcop, 1, LOGOP);
1934 rcop->op_type = OP_REGCOMP;
1935 rcop->op_ppaddr = ppaddr[OP_REGCOMP];
1936 rcop->op_first = scalar(expr);
1937 rcop->op_flags |= OPf_KIDS;
1938 rcop->op_private = 1;
1939 rcop->op_other = op;
1940
1941 /* establish postfix order */
463ee0b2
LW		 1942 if (pm->op_pmflags & PMf_KEEP) {
1943 LINKLIST(expr);
1944 rcop->op_next = expr;
1945 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
1946 }
1947 else {
1948 rcop->op_next = LINKLIST(expr);
1949 expr->op_next = (OP*)rcop;
1950 }
79072805 1951
463ee0b2 1952 prepend_elem(op->op_type, scalar((OP*)rcop), op);
79072805
LW		 1953 }
1954
1955 if (repl) {
748a9306
LW		 1956 OP *curop;
1957 if (pm->op_pmflags & PMf_EVAL)
1958 curop = 0;
1959 else if (repl->op_type == OP_CONST)
1960 curop = repl;
79072805 1961 else {
79072805
LW		 1962 OP *lastop = 0;
1963 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
1964 if (opargs[curop->op_type] & OA_DANGEROUS) {
1965 if (curop->op_type == OP_GV) {
1966 GV *gv = ((GVOP*)curop)->op_gv;
93a17b20 1967 if (strchr("&`'123456789+", *GvENAME(gv)))
79072805
LW		 1968 break;
1969 }
1970 else if (curop->op_type == OP_RV2CV)
1971 break;
1972 else if (curop->op_type == OP_RV2SV ||
1973 curop->op_type == OP_RV2AV ||
1974 curop->op_type == OP_RV2HV ||
1975 curop->op_type == OP_RV2GV) {
1976 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
1977 break;
1978 }
748a9306
LW		 1979 else if (curop->op_type == OP_PADSV ||
1980 curop->op_type == OP_PADAV ||
1981 curop->op_type == OP_PADHV ||
1982 curop->op_type == OP_PADANY) {
1983 /* is okay */
1984 }
79072805
LW		 1985 else
1986 break;
1987 }
1988 lastop = curop;
1989 }
748a9306
LW		 1990 }
1991 if (curop == repl) {
1992 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 1993 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
748a9306
LW		 1994 prepend_elem(op->op_type, scalar(repl), op);
1995 }
1996 else {
1997 Newz(1101, rcop, 1, LOGOP);
1998 rcop->op_type = OP_SUBSTCONT;
1999 rcop->op_ppaddr = ppaddr[OP_SUBSTCONT];
2000 rcop->op_first = scalar(repl);
2001 rcop->op_flags |= OPf_KIDS;
2002 rcop->op_private = 1;
2003 rcop->op_other = op;
2004
2005 /* establish postfix order */
2006 rcop->op_next = LINKLIST(repl);
2007 repl->op_next = (OP*)rcop;
2008
2009 pm->op_pmreplroot = scalar((OP*)rcop);
2010 pm->op_pmreplstart = LINKLIST(rcop);
2011 rcop->op_next = 0;
79072805
LW		 2012 }
2013 }
2014
2015 return (OP*)pm;
2016}
2017
2018OP *
2019newSVOP(type, flags, sv)
2020I32 type;
2021I32 flags;
2022SV *sv;
2023{
2024 SVOP *svop;
2025 Newz(1101, svop, 1, SVOP);
2026 svop->op_type = type;
2027 svop->op_ppaddr = ppaddr[type];
2028 svop->op_sv = sv;
2029 svop->op_next = (OP*)svop;
2030 svop->op_flags = flags;
2031 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2032 scalar((OP*)svop);
79072805 2033 if (opargs[type] & OA_TARGET)
ed6116ce 2034 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2035 return CHECKOP(type, svop);
79072805
LW		 2036}
2037
2038OP *
2039newGVOP(type, flags, gv)
2040I32 type;
2041I32 flags;
2042GV *gv;
2043{
2044 GVOP *gvop;
2045 Newz(1101, gvop, 1, GVOP);
2046 gvop->op_type = type;
2047 gvop->op_ppaddr = ppaddr[type];
8990e307 2048 gvop->op_gv = (GV*)SvREFCNT_inc(gv);
79072805
LW		 2049 gvop->op_next = (OP*)gvop;
2050 gvop->op_flags = flags;
2051 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2052 scalar((OP*)gvop);
79072805 2053 if (opargs[type] & OA_TARGET)
ed6116ce 2054 gvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2055 return CHECKOP(type, gvop);
79072805
LW		 2056}
2057
2058OP *
2059newPVOP(type, flags, pv)
2060I32 type;
2061I32 flags;
2062char *pv;
2063{
2064 PVOP *pvop;
2065 Newz(1101, pvop, 1, PVOP);
2066 pvop->op_type = type;
2067 pvop->op_ppaddr = ppaddr[type];
2068 pvop->op_pv = pv;
2069 pvop->op_next = (OP*)pvop;
2070 pvop->op_flags = flags;
2071 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2072 scalar((OP*)pvop);
79072805 2073 if (opargs[type] & OA_TARGET)
ed6116ce 2074 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2075 return CHECKOP(type, pvop);
79072805
LW		 2076}
2077
79072805
LW		 2078void
2079package(op)
2080OP *op;
2081{
93a17b20 2082 SV *sv;
79072805
LW		 2083
2084 save_hptr(&curstash);
2085 save_item(curstname);
93a17b20 2086 if (op) {
463ee0b2
LW		 2087 STRLEN len;
2088 char *name;
93a17b20 2089 sv = cSVOP->op_sv;
463ee0b2 2090 name = SvPV(sv, len);
b1cb66bf 2091 curstash = gv_stashpvn(name,len,TRUE);
463ee0b2 2092 sv_setpvn(curstname, name, len);
93a17b20
LW		 2093 op_free(op);
2094 }
2095 else {
2096 sv_setpv(curstname,"<none>");
2097 curstash = Nullhv;
2098 }
79072805 2099 copline = NOLINE;
8990e307 2100 expect = XSTATE;
79072805
LW		 2101}
2102
85e6fe83 2103void
b1cb66bf 2104utilize(aver, floor, version, id, arg)
85e6fe83 2105int aver;
c07a80fd 2106I32 floor;
b1cb66bf 2107OP *version;
85e6fe83
LW		 2108OP *id;
2109OP *arg;
2110{
a0d0e21e
LW		 2111 OP *pack;
2112 OP *meth;
2113 OP *rqop;
2114 OP *imop;
b1cb66bf 2115 OP *veop;
85e6fe83 2116
a0d0e21e
LW		 2117 if (id->op_type != OP_CONST)
2118 croak("Module name must be constant");
85e6fe83 2119
b1cb66bf 2120 veop = Nullop;
2121
2122 if(version != Nullop) {
2123 SV *vesv = ((SVOP*)version)->op_sv;
2124
2125 if (arg == Nullop && !SvNIOK(vesv)) {
2126 arg = version;
2127 }
2128 else {
2129 OP *pack;
2130 OP *meth;
2131
2132 if (version->op_type != OP_CONST || !SvNIOK(vesv))
2133 croak("Version number must be constant number");
2134
2135 /* Make copy of id so we don't free it twice */
2136 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
2137
2138 /* Fake up a method call to VERSION */
2139 meth = newSVOP(OP_CONST, 0, newSVpv("VERSION", 7));
2140 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
2141 append_elem(OP_LIST,
2142 prepend_elem(OP_LIST, pack, list(version)),
2143 newUNOP(OP_METHOD, 0, meth)));
2144 }
2145 }
2146
a0d0e21e 2147 /* Fake up an import/unimport */
4633a7c4
LW		 2148 if (arg && arg->op_type == OP_STUB)
2149 imop = arg; /* no import on explicit () */
b1cb66bf 2150 else if(SvNIOK(((SVOP*)id)->op_sv)) {
2151 imop = Nullop; /* use 5.0; */
2152 }
4633a7c4
LW		 2153 else {
2154 /* Make copy of id so we don't free it twice */
2155 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
4633a7c4
LW		 2156 meth = newSVOP(OP_CONST, 0,
2157 aver
2158 ? newSVpv("import", 6)
2159 : newSVpv("unimport", 8)
2160 );
2161 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
a0d0e21e
LW		 2162 append_elem(OP_LIST,
2163 prepend_elem(OP_LIST, pack, list(arg)),
2164 newUNOP(OP_METHOD, 0, meth)));
4633a7c4
LW		 2165 }
2166
2167 /* Fake up a require */
2168 rqop = newUNOP(OP_REQUIRE, 0, id);
a0d0e21e
LW		 2169
2170 /* Fake up the BEGIN {}, which does its thing immediately. */
c07a80fd 2171 newSUB(floor,
a0d0e21e 2172 newSVOP(OP_CONST, 0, newSVpv("BEGIN", 5)),
4633a7c4 2173 Nullop,
a0d0e21e 2174 append_elem(OP_LINESEQ,
b1cb66bf 2175 append_elem(OP_LINESEQ,
2176 newSTATEOP(0, Nullch, rqop),
2177 newSTATEOP(0, Nullch, veop)),
a0d0e21e 2178 newSTATEOP(0, Nullch, imop) ));
85e6fe83 2179
85e6fe83
LW		 2180 copline = NOLINE;
2181 expect = XSTATE;
2182}
2183
79072805
LW		 2184OP *
2185newSLICEOP(flags, subscript, listval)
2186I32 flags;
2187OP *subscript;
2188OP *listval;
2189{
2190 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 2191 list(force_list(subscript)),
2192 list(force_list(listval)) );
79072805
LW		 2193}
2194
2195static I32
2196list_assignment(op)
2197register OP *op;
2198{
2199 if (!op)
2200 return TRUE;
2201
2202 if (op->op_type == OP_NULL && op->op_flags & OPf_KIDS)
2203 op = cUNOP->op_first;
2204
2205 if (op->op_type == OP_COND_EXPR) {
2206 I32 t = list_assignment(cCONDOP->op_first->op_sibling);
2207 I32 f = list_assignment(cCONDOP->op_first->op_sibling->op_sibling);
2208
2209 if (t && f)
2210 return TRUE;
2211 if (t || f)
2212 yyerror("Assignment to both a list and a scalar");
2213 return FALSE;
2214 }
2215
2216 if (op->op_type == OP_LIST || op->op_flags & OPf_PARENS ||
2217 op->op_type == OP_RV2AV || op->op_type == OP_RV2HV ||
2218 op->op_type == OP_ASLICE || op->op_type == OP_HSLICE)
2219 return TRUE;
2220
93a17b20
LW		 2221 if (op->op_type == OP_PADAV || op->op_type == OP_PADHV)
2222 return TRUE;
2223
79072805
LW		 2224 if (op->op_type == OP_RV2SV)
2225 return FALSE;
2226
2227 return FALSE;
2228}
2229
2230OP *
a0d0e21e 2231newASSIGNOP(flags, left, optype, right)
79072805
LW		 2232I32 flags;
2233OP *left;
a0d0e21e 2234I32 optype;
79072805
LW		 2235OP *right;
2236{
2237 OP *op;
2238
a0d0e21e
LW		 2239 if (optype) {
2240 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN) {
2241 return newLOGOP(optype, 0,
2242 mod(scalar(left), optype),
2243 newUNOP(OP_SASSIGN, 0, scalar(right)));
2244 }
2245 else {
2246 return newBINOP(optype, OPf_STACKED,
2247 mod(scalar(left), optype), scalar(right));
2248 }
2249 }
2250
79072805 2251 if (list_assignment(left)) {
463ee0b2 2252 modcount = 0;
748a9306 2253 eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 2254 left = mod(left, OP_AASSIGN);
748a9306
LW		 2255 if (eval_start)
2256 eval_start = 0;
2257 else {
a0d0e21e
LW		 2258 op_free(left);
2259 op_free(right);
2260 return Nullop;
2261 }
79072805 2262 op = newBINOP(OP_AASSIGN, flags,
8990e307
LW		 2263 list(force_list(right)),
2264 list(force_list(left)) );
c07a80fd 2265 op->op_private = 0 | (flags >> 8);
a0d0e21e 2266 if (!(left->op_private & OPpLVAL_INTRO)) {
748a9306 2267 static int generation = 100;
79072805
LW		 2268 OP *curop;
2269 OP *lastop = op;
2270 generation++;
2271 for (curop = LINKLIST(op); curop != op; curop = LINKLIST(curop)) {
2272 if (opargs[curop->op_type] & OA_DANGEROUS) {
2273 if (curop->op_type == OP_GV) {
2274 GV *gv = ((GVOP*)curop)->op_gv;
2275 if (gv == defgv || SvCUR(gv) == generation)
2276 break;
2277 SvCUR(gv) = generation;
2278 }
748a9306
LW		 2279 else if (curop->op_type == OP_PADSV ||
2280 curop->op_type == OP_PADAV ||
2281 curop->op_type == OP_PADHV ||
2282 curop->op_type == OP_PADANY) {
2283 SV **svp = AvARRAY(comppad_name);
8e07c86e 2284 SV *sv = svp[curop->op_targ];
748a9306
LW		 2285 if (SvCUR(sv) == generation)
2286 break;
2287 SvCUR(sv) = generation; /* (SvCUR not used any more) */
2288 }
79072805
LW		 2289 else if (curop->op_type == OP_RV2CV)
2290 break;
2291 else if (curop->op_type == OP_RV2SV ||
2292 curop->op_type == OP_RV2AV ||
2293 curop->op_type == OP_RV2HV ||
2294 curop->op_type == OP_RV2GV) {
2295 if (lastop->op_type != OP_GV) /* funny deref? */
2296 break;
2297 }
2298 else
2299 break;
2300 }
2301 lastop = curop;
2302 }
2303 if (curop != op)
2304 op->op_private = OPpASSIGN_COMMON;
2305 }
c07a80fd 2306 if (right && right->op_type == OP_SPLIT) {
2307 OP* tmpop;
2308 if ((tmpop = ((LISTOP*)right)->op_first) &&
2309 tmpop->op_type == OP_PUSHRE)
2310 {
2311 PMOP *pm = (PMOP*)tmpop;
2312 if (left->op_type == OP_RV2AV &&
2313 !(left->op_private & OPpLVAL_INTRO) &&
2314 !(op->op_private & OPpASSIGN_COMMON) )
2315 {
2316 tmpop = ((UNOP*)left)->op_first;
2317 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
2318 pm->op_pmreplroot = (OP*)((GVOP*)tmpop)->op_gv;
2319 pm->op_pmflags |= PMf_ONCE;
2320 tmpop = ((UNOP*)op)->op_first; /* to list (nulled) */
2321 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
2322 tmpop->op_sibling = Nullop; /* don't free split */
2323 right->op_next = tmpop->op_next; /* fix starting loc */
2324 op_free(op); /* blow off assign */
a5f75d66
AD		 2325 right->op_flags &= ~(OPf_KNOW|OPf_LIST);
2326 /* "I don't know and I don't care." */
c07a80fd 2327 return right;
2328 }
2329 }
2330 else {
2331 if (modcount < 10000 &&
2332 ((LISTOP*)right)->op_last->op_type == OP_CONST)
2333 {
2334 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
2335 if (SvIVX(sv) == 0)
2336 sv_setiv(sv, modcount+1);
2337 }
2338 }
2339 }
2340 }
79072805
LW		 2341 return op;
2342 }
2343 if (!right)
2344 right = newOP(OP_UNDEF, 0);
2345 if (right->op_type == OP_READLINE) {
2346 right->op_flags |= OPf_STACKED;
463ee0b2 2347 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 2348 }
a0d0e21e 2349 else {
748a9306 2350 eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
79072805 2351 op = newBINOP(OP_SASSIGN, flags,
463ee0b2 2352 scalar(right), mod(scalar(left), OP_SASSIGN) );
748a9306
LW		 2353 if (eval_start)
2354 eval_start = 0;
2355 else {
a0d0e21e
LW		 2356 op_free(op);
2357 return Nullop;
2358 }
2359 }
79072805
LW		 2360 return op;
2361}
2362
2363OP *
2364newSTATEOP(flags, label, op)
2365I32 flags;
2366char *label;
2367OP *op;
2368{
bbce6d69 2369 U32 seq = intro_my();
79072805
LW		 2370 register COP *cop;
2371
2372 Newz(1101, cop, 1, COP);
8990e307
LW		 2373 if (perldb && curcop->cop_line && curstash != debstash) {
2374 cop->op_type = OP_DBSTATE;
2375 cop->op_ppaddr = ppaddr[ OP_DBSTATE ];
2376 }
2377 else {
2378 cop->op_type = OP_NEXTSTATE;
2379 cop->op_ppaddr = ppaddr[ OP_NEXTSTATE ];
2380 }
79072805 2381 cop->op_flags = flags;
c07a80fd 2382 cop->op_private = 0 | (flags >> 8);
79072805
LW		 2383 cop->op_next = (OP*)cop;
2384
463ee0b2
LW		 2385 if (label) {
2386 cop->cop_label = label;
85e6fe83 2387 hints |= HINT_BLOCK_SCOPE;
463ee0b2 2388 }
bbce6d69 2389 cop->cop_seq = seq;
a0d0e21e 2390 cop->cop_arybase = curcop->cop_arybase;
79072805
LW		 2391
2392 if (copline == NOLINE)
2393 cop->cop_line = curcop->cop_line;
2394 else {
2395 cop->cop_line = copline;
2396 copline = NOLINE;
2397 }
44a8e56a 2398 cop->cop_filegv = (GV*)SvREFCNT_inc(curcop->cop_filegv);
79072805
LW		 2399 cop->cop_stash = curstash;
2400
8990e307 2401 if (perldb && curstash != debstash) {
93a17b20
LW		 2402 SV **svp = av_fetch(GvAV(curcop->cop_filegv),(I32)cop->cop_line, FALSE);
2403 if (svp && *svp != &sv_undef && !SvIOK(*svp)) {
a0d0e21e 2404 (void)SvIOK_on(*svp);
a5f75d66 2405 SvIVX(*svp) = 1;
93a17b20
LW		 2406 SvSTASH(*svp) = (HV*)cop;
2407 }
2408 }
2409
79072805
LW		 2410 return prepend_elem(OP_LINESEQ, (OP*)cop, op);
2411}
2412
bbce6d69 2413/* "Introduce" my variables to visible status. */
2414U32
2415intro_my()
2416{
2417 SV **svp;
2418 SV *sv;
2419 I32 i;
2420
2421 if (! min_intro_pending)
2422 return cop_seqmax;
2423
2424 svp = AvARRAY(comppad_name);
2425 for (i = min_intro_pending; i <= max_intro_pending; i++) {
2426 if ((sv = svp[i]) && sv != &sv_undef && !SvIVX(sv)) {
2427 SvIVX(sv) = 999999999; /* Don't know scope end yet. */
2428 SvNVX(sv) = (double)cop_seqmax;
2429 }
2430 }
2431 min_intro_pending = 0;
2432 comppad_name_fill = max_intro_pending; /* Needn't search higher */
2433 return cop_seqmax++;
2434}
2435
79072805
LW		 2436OP *
2437newLOGOP(type, flags, first, other)
2438I32 type;
2439I32 flags;
2440OP* first;
2441OP* other;
2442{
2443 LOGOP *logop;
2444 OP *op;
2445
a0d0e21e
LW		 2446 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
2447 return newBINOP(type, flags, scalar(first), scalar(other));
2448
8990e307 2449 scalarboolean(first);
79072805
LW		 2450 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
2451 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
2452 if (type == OP_AND || type == OP_OR) {
2453 if (type == OP_AND)
2454 type = OP_OR;
2455 else
2456 type = OP_AND;
2457 op = first;
2458 first = cUNOP->op_first;
2459 if (op->op_next)
2460 first->op_next = op->op_next;
2461 cUNOP->op_first = Nullop;
2462 op_free(op);
2463 }
2464 }
2465 if (first->op_type == OP_CONST) {
93a17b20 2466 if (dowarn && (first->op_private & OPpCONST_BARE))
c07a80fd 2467 warn("Probable precedence problem on %s", op_desc[type]);
79072805
LW		 2468 if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
2469 op_free(first);
2470 return other;
2471 }
2472 else {
2473 op_free(other);
2474 return first;
2475 }
2476 }
2477 else if (first->op_type == OP_WANTARRAY) {
2478 if (type == OP_AND)
2479 list(other);
2480 else
2481 scalar(other);
2482 }
a6006777 2483 else if (dowarn && (first->op_flags & OPf_KIDS)) {
2484 OP *k1 = ((UNOP*)first)->op_first;
2485 OP *k2 = k1->op_sibling;
2486 OPCODE warnop = 0;
2487 switch (first->op_type)
2488 {
2489 case OP_NULL:
2490 if (k2 && k2->op_type == OP_READLINE
2491 && (k2->op_flags & OPf_STACKED)
2492 && (k1->op_type == OP_RV2SV || k1->op_type == OP_PADSV))
2493 warnop = k2->op_type;
2494 break;
2495
2496 case OP_SASSIGN:
2497 if (k1->op_type == OP_READDIR || k1->op_type == OP_GLOB)
2498 warnop = k1->op_type;
2499 break;
2500 }
8ebc5c01 2501 if (warnop) {
2502 line_t oldline = curcop->cop_line;
2503 curcop->cop_line = copline;
2504 warn("Value of %s construct can be \"0\"; test with defined()",
2505 op_desc[warnop]);
2506 curcop->cop_line = oldline;
2507 }
a6006777 2508 }
79072805
LW		 2509
2510 if (!other)
2511 return first;
2512
a0d0e21e
LW		 2513 if (type == OP_ANDASSIGN || type == OP_ORASSIGN)
2514 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
2515
79072805
LW		 2516 Newz(1101, logop, 1, LOGOP);
2517
2518 logop->op_type = type;
2519 logop->op_ppaddr = ppaddr[type];
2520 logop->op_first = first;
2521 logop->op_flags = flags | OPf_KIDS;
2522 logop->op_other = LINKLIST(other);
c07a80fd 2523 logop->op_private = 1 | (flags >> 8);
79072805
LW		 2524
2525 /* establish postfix order */
2526 logop->op_next = LINKLIST(first);
2527 first->op_next = (OP*)logop;
2528 first->op_sibling = other;
2529
2530 op = newUNOP(OP_NULL, 0, (OP*)logop);
2531 other->op_next = op;
2532
2533 return op;
2534}
2535
2536OP *
b1cb66bf 2537newCONDOP(flags, first, trueop, falseop)
79072805
LW		 2538I32 flags;
2539OP* first;
b1cb66bf 2540OP* trueop;
2541OP* falseop;
79072805
LW		 2542{
2543 CONDOP *condop;
2544 OP *op;
2545
b1cb66bf 2546 if (!falseop)
2547 return newLOGOP(OP_AND, 0, first, trueop);
2548 if (!trueop)
2549 return newLOGOP(OP_OR, 0, first, falseop);
79072805 2550
8990e307 2551 scalarboolean(first);
79072805
LW		 2552 if (first->op_type == OP_CONST) {
2553 if (SvTRUE(((SVOP*)first)->op_sv)) {
2554 op_free(first);
b1cb66bf 2555 op_free(falseop);
2556 return trueop;
79072805
LW		 2557 }
2558 else {
2559 op_free(first);
b1cb66bf 2560 op_free(trueop);
2561 return falseop;
79072805
LW		 2562 }
2563 }
2564 else if (first->op_type == OP_WANTARRAY) {
b1cb66bf 2565 list(trueop);
2566 scalar(falseop);
79072805
LW		 2567 }
2568 Newz(1101, condop, 1, CONDOP);
2569
2570 condop->op_type = OP_COND_EXPR;
2571 condop->op_ppaddr = ppaddr[OP_COND_EXPR];
2572 condop->op_first = first;
2573 condop->op_flags = flags | OPf_KIDS;
b1cb66bf 2574 condop->op_true = LINKLIST(trueop);
2575 condop->op_false = LINKLIST(falseop);
c07a80fd 2576 condop->op_private = 1 | (flags >> 8);
79072805
LW		 2577
2578 /* establish postfix order */
2579 condop->op_next = LINKLIST(first);
2580 first->op_next = (OP*)condop;
2581
b1cb66bf 2582 first->op_sibling = trueop;
2583 trueop->op_sibling = falseop;
79072805
LW		 2584 op = newUNOP(OP_NULL, 0, (OP*)condop);
2585
b1cb66bf 2586 trueop->op_next = op;
2587 falseop->op_next = op;
79072805
LW		 2588
2589 return op;
2590}
2591
2592OP *
2593newRANGE(flags, left, right)
2594I32 flags;
2595OP *left;
2596OP *right;
2597{
2598 CONDOP *condop;
2599 OP *flip;
2600 OP *flop;
2601 OP *op;
2602
2603 Newz(1101, condop, 1, CONDOP);
2604
2605 condop->op_type = OP_RANGE;
2606 condop->op_ppaddr = ppaddr[OP_RANGE];
2607 condop->op_first = left;
2608 condop->op_flags = OPf_KIDS;
2609 condop->op_true = LINKLIST(left);
2610 condop->op_false = LINKLIST(right);
c07a80fd 2611 condop->op_private = 1 | (flags >> 8);
79072805
LW		 2612
2613 left->op_sibling = right;
2614
2615 condop->op_next = (OP*)condop;
2616 flip = newUNOP(OP_FLIP, flags, (OP*)condop);
2617 flop = newUNOP(OP_FLOP, 0, flip);
2618 op = newUNOP(OP_NULL, 0, flop);
2619 linklist(flop);
2620
2621 left->op_next = flip;
2622 right->op_next = flop;
2623
ed6116ce 2624 condop->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805 2625 sv_upgrade(PAD_SV(condop->op_targ), SVt_PVNV);
ed6116ce 2626 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 2627 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
2628
2629 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
2630 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
2631
2632 flip->op_next = op;
2633 if (!flip->op_private || !flop->op_private)
2634 linklist(op); /* blow off optimizer unless constant */
2635
2636 return op;
2637}
2638
2639OP *
2640newLOOPOP(flags, debuggable, expr, block)
2641I32 flags;
2642I32 debuggable;
2643OP *expr;
2644OP *block;
2645{
463ee0b2 2646 OP* listop;
93a17b20 2647 OP* op;
463ee0b2 2648 int once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 2649 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
93a17b20 2650
463ee0b2
LW		 2651 if (expr) {
2652 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
2653 return block; /* do {} while 0 does once */
774d564b 2654 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB) {
2655 expr = newUNOP(OP_DEFINED, 0,
2656 newASSIGNOP(0, newSVREF(newGVOP(OP_GV, 0, defgv)), 0, expr) );
2657 }
463ee0b2 2658 }
93a17b20 2659
8990e307 2660 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
93a17b20 2661 op = newLOGOP(OP_AND, 0, expr, listop);
463ee0b2 2662
79072805
LW		 2663 ((LISTOP*)listop)->op_last->op_next = LINKLIST(op);
2664
463ee0b2 2665 if (once && op != listop)
79072805
LW		 2666 op->op_next = ((LOGOP*)cUNOP->op_first)->op_other;
2667
748a9306
LW		 2668 if (op == listop)
2669 op = newUNOP(OP_NULL, 0, op); /* or do {} while 1 loses outer block */
2670
79072805 2671 op->op_flags |= flags;
a0d0e21e 2672 op = scope(op);
748a9306 2673 op->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
a0d0e21e 2674 return op;
79072805
LW		 2675}
2676
2677OP *
2678newWHILEOP(flags, debuggable, loop, expr, block, cont)
2679I32 flags;
2680I32 debuggable;
2681LOOP *loop;
2682OP *expr;
2683OP *block;
2684OP *cont;
2685{
2686 OP *redo;
2687 OP *next = 0;
2688 OP *listop;
2689 OP *op;
2690 OP *condop;
2691
748a9306
LW		 2692 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB)) {
2693 expr = newUNOP(OP_DEFINED, 0,
2694 newASSIGNOP(0, newSVREF(newGVOP(OP_GV, 0, defgv)), 0, expr) );
2695 }
79072805
LW		 2696
2697 if (!block)
2698 block = newOP(OP_NULL, 0);
2699
2700 if (cont)
2701 next = LINKLIST(cont);
2702 if (expr)
2703 cont = append_elem(OP_LINESEQ, cont, newOP(OP_UNSTACK, 0));
2704
463ee0b2 2705 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 2706 redo = LINKLIST(listop);
2707
2708 if (expr) {
2709 op = newLOGOP(OP_AND, 0, expr, scalar(listop));
85e6fe83
LW		 2710 if (op == expr && op->op_type == OP_CONST && !SvTRUE(cSVOP->op_sv)) {
2711 op_free(expr); /* oops, it's a while (0) */
463ee0b2
LW		 2712 op_free((OP*)loop);
2713 return Nullop; /* (listop already freed by newLOGOP) */
2714 }
79072805
LW		 2715 ((LISTOP*)listop)->op_last->op_next = condop =
2716 (op == listop ? redo : LINKLIST(op));
2717 if (!next)
2718 next = condop;
2719 }
2720 else
2721 op = listop;
2722
2723 if (!loop) {
2724 Newz(1101,loop,1,LOOP);
2725 loop->op_type = OP_ENTERLOOP;
2726 loop->op_ppaddr = ppaddr[OP_ENTERLOOP];
2727 loop->op_private = 0;
2728 loop->op_next = (OP*)loop;
2729 }
2730
463ee0b2 2731 op = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, op);
79072805
LW		 2732
2733 loop->op_redoop = redo;
2734 loop->op_lastop = op;
2735
2736 if (next)
2737 loop->op_nextop = next;
2738 else
2739 loop->op_nextop = op;
2740
2741 op->op_flags |= flags;
c07a80fd 2742 op->op_private |= (flags >> 8);
79072805
LW		 2743 return op;
2744}
2745
2746OP *
a0d0e21e 2747#ifndef CAN_PROTOTYPE
79072805
LW		 2748newFOROP(flags,label,forline,sv,expr,block,cont)
2749I32 flags;
2750char *label;
2751line_t forline;
2752OP* sv;
2753OP* expr;
2754OP*block;
2755OP*cont;
8990e307
LW		 2756#else
2757newFOROP(I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *block,OP *cont)
a0d0e21e 2758#endif /* CAN_PROTOTYPE */
79072805
LW		 2759{
2760 LOOP *loop;
85e6fe83 2761 int padoff = 0;
4633a7c4 2762 I32 iterflags = 0;
79072805
LW		 2763
2764 copline = forline;
2765 if (sv) {
85e6fe83 2766 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
748a9306
LW		 2767 sv->op_type = OP_RV2GV;
2768 sv->op_ppaddr = ppaddr[OP_RV2GV];
79072805 2769 }
85e6fe83
LW		 2770 else if (sv->op_type == OP_PADSV) { /* private variable */
2771 padoff = sv->op_targ;
2772 op_free(sv);
2773 sv = Nullop;
2774 }
79072805 2775 else
c07a80fd 2776 croak("Can't use %s for loop variable", op_desc[sv->op_type]);
79072805
LW		 2777 }
2778 else {
2779 sv = newGVOP(OP_GV, 0, defgv);
2780 }
5f05dabc 2781 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
4633a7c4
LW		 2782 expr = scalar(ref(expr, OP_ITER));
2783 iterflags |= OPf_STACKED;
2784 }
2785 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
a0d0e21e
LW		 2786 append_elem(OP_LIST, mod(force_list(expr), OP_GREPSTART),
2787 scalar(sv))));
85e6fe83
LW		 2788 assert(!loop->op_next);
2789 Renew(loop, 1, LOOP);
2790 loop->op_targ = padoff;
2791 return newSTATEOP(0, label, newWHILEOP(flags, 1, loop,
2792 newOP(OP_ITER, 0), block, cont));
79072805
LW		 2793}
2794
8990e307
LW		 2795OP*
2796newLOOPEX(type, label)
2797I32 type;
2798OP* label;
2799{
2800 OP *op;
2801 if (type != OP_GOTO || label->op_type == OP_CONST) {
a0d0e21e
LW		 2802 op = newPVOP(type, 0, savepv(
2803 label->op_type == OP_CONST
2804 ? SvPVx(((SVOP*)label)->op_sv, na)
2805 : "" ));
8990e307
LW		 2806 op_free(label);
2807 }
2808 else {
a0d0e21e
LW		 2809 if (label->op_type == OP_ENTERSUB)
2810 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
8990e307
LW		 2811 op = newUNOP(type, OPf_STACKED, label);
2812 }
85e6fe83 2813 hints |= HINT_BLOCK_SCOPE;
8990e307
LW		 2814 return op;
2815}
2816
79072805 2817void
85e6fe83 2818cv_undef(cv)
79072805
LW		 2819CV *cv;
2820{
a0d0e21e
LW		 2821 if (!CvXSUB(cv) && CvROOT(cv)) {
2822 if (CvDEPTH(cv))
2823 croak("Can't undef active subroutine");
8990e307 2824 ENTER;
a0d0e21e
LW		 2825
2826 SAVESPTR(curpad);
2827 curpad = 0;
2828
a5f75d66 2829 if (!CvCLONED(cv))
748a9306 2830 op_free(CvROOT(cv));
79072805 2831 CvROOT(cv) = Nullop;
8990e307 2832 LEAVE;
79072805 2833 }
44a8e56a 2834 CvFLAGS(cv) = 0;
8e07c86e
AD		 2835 SvREFCNT_dec(CvGV(cv));
2836 CvGV(cv) = Nullgv;
2837 SvREFCNT_dec(CvOUTSIDE(cv));
2838 CvOUTSIDE(cv) = Nullcv;
2839 if (CvPADLIST(cv)) {
8ebc5c01 2840 /* may be during global destruction */
2841 if (SvREFCNT(CvPADLIST(cv))) {
2842 I32 i = AvFILL(CvPADLIST(cv));
2843 while (i >= 0) {
2844 SV** svp = av_fetch(CvPADLIST(cv), i--, FALSE);
2845 if (svp)
2846 SvREFCNT_dec(*svp);
2847 }
2848 SvREFCNT_dec((SV*)CvPADLIST(cv));
8e07c86e 2849 }
8e07c86e
AD		 2850 CvPADLIST(cv) = Nullav;
2851 }
79072805
LW		 2852}
2853
5f05dabc 2854#ifdef DEBUG_CLOSURES
2855static void
2856cv_dump(cv)
2857CV* cv;
2858{
2859 CV *outside = CvOUTSIDE(cv);
2860 AV* padlist = CvPADLIST(cv);
2861 AV* pad_name = (AV*)*av_fetch(padlist, 0, FALSE);
2862 AV* pad = (AV*)*av_fetch(padlist, 1, FALSE);
2863 SV** pname = AvARRAY(pad_name);
2864 SV** ppad = AvARRAY(pad);
2865 I32 ix;
2866
2867 PerlIO_printf(Perl_debug_log, "\tCV=0x%p (%s), OUTSIDE=0x%p (%s)\n",
ab50184a
CS		 2868 cv,
2869 (CvANON(cv) ? "ANON"
2870 : (cv == main_cv) ? "MAIN"
07055b4c 2871 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 2872 : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
ab50184a
CS		 2873 outside,
2874 (!outside ? "null"
2875 : CvANON(outside) ? "ANON"
2876 : (outside == main_cv) ? "MAIN"
07055b4c 2877 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 2878 : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
5f05dabc 2879
2880 for (ix = 1; ix <= AvFILL(pad); ix++) {
2881 if (SvPOK(pname[ix]))
ab50184a
CS		 2882 PerlIO_printf(Perl_debug_log, "\t%4d. 0x%p (\"%s\" %ld-%ld)\n",
2883 ix, ppad[ix], SvPVX(pname[ix]),
2884 (long)I_32(SvNVX(pname[ix])),
2885 (long)SvIVX(pname[ix]));
5f05dabc 2886 }
2887}
2888#endif /* DEBUG_CLOSURES */
2889
2890static CV *
2891cv_clone2(proto, outside)
748a9306 2892CV* proto;
5f05dabc 2893CV* outside;
748a9306
LW		 2894{
2895 AV* av;
2896 I32 ix;
2897 AV* protopadlist = CvPADLIST(proto);
2898 AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE);
2899 AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE);
5f05dabc 2900 SV** pname = AvARRAY(protopad_name);
2901 SV** ppad = AvARRAY(protopad);
748a9306
LW		 2902 AV* comppadlist;
2903 CV* cv;
2904
07055b4c
CS		 2905 assert(!CvUNIQUE(proto));
2906
748a9306
LW		 2907 ENTER;
2908 SAVESPTR(curpad);
2909 SAVESPTR(comppad);
2910 SAVESPTR(compcv);
2911
2912 cv = compcv = (CV*)NEWSV(1104,0);
fa83b5b6 2913 sv_upgrade((SV *)cv, SvTYPE(proto));
a5f75d66 2914 CvCLONED_on(cv);
5f05dabc 2915 if (CvANON(proto))
2916 CvANON_on(cv);
748a9306
LW		 2917
2918 CvFILEGV(cv) = CvFILEGV(proto);
44a8e56a 2919 CvGV(cv) = (GV*)SvREFCNT_inc(CvGV(proto));
748a9306
LW		 2920 CvSTASH(cv) = CvSTASH(proto);
2921 CvROOT(cv) = CvROOT(proto);
2922 CvSTART(cv) = CvSTART(proto);
5f05dabc 2923 if (outside)
2924 CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside);
748a9306
LW		 2925
2926 comppad = newAV();
2927
2928 comppadlist = newAV();
2929 AvREAL_off(comppadlist);
2930 av_store(comppadlist, 0, SvREFCNT_inc((SV*)protopad_name));
b355b4e0 2931 av_store(comppadlist, 1, (SV*)comppad);
748a9306 2932 CvPADLIST(cv) = comppadlist;
5f05dabc 2933 av_fill(comppad, AvFILL(protopad));
748a9306
LW		 2934 curpad = AvARRAY(comppad);
2935
2936 av = newAV(); /* will be @_ */
2937 av_extend(av, 0);
2938 av_store(comppad, 0, (SV*)av);
2939 AvFLAGS(av) = AVf_REIFY;
2940
5f05dabc 2941 for (ix = AvFILL(protopad); ix > 0; ix--) {
2942 SV* sv;
2943 if (pname[ix] != &sv_undef) {
2944 char *name = SvPVX(pname[ix]); /* XXX */
2945 if (SvFLAGS(pname[ix]) & SVf_FAKE) { /* lexical from outside? */
2946 I32 off = pad_findlex(name, ix, SvIVX(pname[ix]),
2947 CvOUTSIDE(cv), cxstack_ix);
2948 if (!off)
2949 curpad[ix] = SvREFCNT_inc(ppad[ix]);
2950 else if (off != ix)
748a9306
LW		 2951 croak("panic: cv_clone: %s", name);
2952 }
2953 else { /* our own lexical */
5f05dabc 2954 if (*name == '&') {
2955 /* anon code -- we'll come back for it */
2956 sv = SvREFCNT_inc(ppad[ix]);
2957 }
2958 else if (*name == '@')
2959 sv = (SV*)newAV();
748a9306 2960 else if (*name == '%')
5f05dabc 2961 sv = (SV*)newHV();
748a9306 2962 else
5f05dabc 2963 sv = NEWSV(0,0);
2964 if (!SvPADBUSY(sv))
2965 SvPADMY_on(sv);
2966 curpad[ix] = sv;
748a9306
LW		 2967 }
2968 }
2969 else {
5f05dabc 2970 sv = NEWSV(0,0);
748a9306 2971 SvPADTMP_on(sv);
5f05dabc 2972 curpad[ix] = sv;
748a9306
LW		 2973 }
2974 }
2975
5f05dabc 2976 /* Now that vars are all in place, clone nested closures. */
2977
2978 for (ix = AvFILL(protopad); ix > 0; ix--) {
2979 if (pname[ix] != &sv_undef
2980 && !(SvFLAGS(pname[ix]) & SVf_FAKE)
2981 && *SvPVX(pname[ix]) == '&'
2982 && CvCLONE(ppad[ix]))
2983 {
2984 CV *kid = cv_clone2((CV*)ppad[ix], cv);
2985 SvREFCNT_dec(ppad[ix]);
2986 CvCLONE_on(kid);
2987 SvPADMY_on(kid);
2988 curpad[ix] = (SV*)kid;
2989 }
2990 }
2991
2992#ifdef DEBUG_CLOSURES
ab50184a
CS		 2993 PerlIO_printf(Perl_debug_log, "Cloned inside:\n");
2994 cv_dump(outside);
2995 PerlIO_printf(Perl_debug_log, " from:\n");
5f05dabc 2996 cv_dump(proto);
ab50184a 2997 PerlIO_printf(Perl_debug_log, " to:\n");
5f05dabc 2998 cv_dump(cv);
2999#endif
3000
748a9306
LW		 3001 LEAVE;
3002 return cv;
3003}
3004
5f05dabc 3005CV *
3006cv_clone(proto)
3007CV* proto;
3008{
3009 return cv_clone2(proto, CvOUTSIDE(proto));
3010}
3011
760ac839
LW		 3012SV *
3013cv_const_sv(cv)
3014CV *cv;
3015{
3016 OP *o;
3017 SV *sv = Nullsv;
3018
3019 if(cv && SvPOK(cv) && !SvCUR(cv)) {
3020 for (o = CvSTART(cv); o; o = o->op_next) {
3021 OPCODE type = o->op_type;
3022
3023 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
3024 continue;
3025 if (type == OP_LEAVESUB || type == OP_RETURN)
3026 break;
3027 if (type != OP_CONST || sv)
3028 return Nullsv;
3029
3030 sv = ((SVOP*)o)->op_sv;
3031 }
3032 }
3033 return sv;
3034}
3035
748a9306 3036CV *
4633a7c4 3037newSUB(floor,op,proto,block)
79072805
LW		 3038I32 floor;
3039OP *op;
4633a7c4 3040OP *proto;
79072805
LW		 3041OP *block;
3042{
44a8e56a 3043 char *name = op ? SvPVx(cSVOP->op_sv, na) : Nullch;
3044 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
79072805 3045 register CV *cv;
44a8e56a 3046 AV *av;
a0d0e21e 3047 I32 ix;
79072805 3048
44a8e56a 3049 if (op)
8ebc5c01 3050 SAVEFREEOP(op);
44a8e56a 3051 if (cv = (name ? GvCV(gv) : Nullcv)) {
a6006777 3052 if (GvCVGEN(gv)) {
3053 /* just a cached method */
3054 SvREFCNT_dec(cv);
3055 cv = 0;
3056 }
a5f75d66 3057 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
28757baa 3058 /* already defined (or promised) */
760ac839 3059
28757baa 3060 SV* const_sv = cv_const_sv(cv);
760ac839
LW		 3061 char *p = proto ? SvPVx(((SVOP*)proto)->op_sv, na) : Nullch;
3062
3063 if((!proto != !SvPOK(cv)) || (p && strNE(SvPV((SV*)cv,na), p))) {
3064 warn("Prototype mismatch: (%s) vs (%s)",
3065 SvPOK(cv) ? SvPV((SV*)cv,na) : "none",
3066 p ? p : "none");
3067 }
44a8e56a 3068 if (const_sv || dowarn) {
79072805 3069 line_t oldline = curcop->cop_line;
79072805 3070 curcop->cop_line = copline;
760ac839
LW		 3071 warn(const_sv ? "Constant subroutine %s redefined"
3072 : "Subroutine %s redefined",name);
79072805
LW		 3073 curcop->cop_line = oldline;
3074 }
8990e307 3075 SvREFCNT_dec(cv);
a0d0e21e 3076 cv = 0;
79072805
LW		 3077 }
3078 }
a0d0e21e 3079 if (cv) { /* must reuse cv if autoloaded */
4633a7c4 3080 cv_undef(cv);
44a8e56a 3081 CvFLAGS(cv) = CvFLAGS(compcv);
748a9306 3082 CvOUTSIDE(cv) = CvOUTSIDE(compcv);
e9a444f0 3083 CvOUTSIDE(compcv) = 0;
748a9306 3084 CvPADLIST(cv) = CvPADLIST(compcv);
4aa0a1f7 3085 CvPADLIST(compcv) = 0;
4633a7c4
LW		 3086 if (SvREFCNT(compcv) > 1) /* XXX Make closures transit through stub. */
3087 CvOUTSIDE(compcv) = (CV*)SvREFCNT_inc((SV*)cv);
748a9306 3088 SvREFCNT_dec(compcv);
a0d0e21e
LW		 3089 }
3090 else {
748a9306 3091 cv = compcv;
44a8e56a 3092 if (name) {
3093 GvCV(gv) = cv;
3094 GvCVGEN(gv) = 0;
3095 sub_generation++;
3096 }
a0d0e21e 3097 }
44a8e56a 3098 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
79072805 3099 CvFILEGV(cv) = curcop->cop_filegv;
8990e307
LW		 3100 CvSTASH(cv) = curstash;
3101
4633a7c4
LW		 3102 if (proto) {
3103 char *p = SvPVx(((SVOP*)proto)->op_sv, na);
4633a7c4 3104 sv_setpv((SV*)cv, p);
c07a80fd 3105 op_free(proto);
4633a7c4
LW		 3106 }
3107
c07a80fd 3108 if (error_count) {
3109 op_free(block);
3110 block = Nullop;
3111 }
a0d0e21e 3112 if (!block) {
a0d0e21e
LW		 3113 copline = NOLINE;
3114 LEAVE_SCOPE(floor);
3115 return cv;
3116 }
3117
3118 av = newAV(); /* Will be @_ */
3119 av_extend(av, 0);
8990e307 3120 av_store(comppad, 0, (SV*)av);
a0d0e21e
LW		 3121 AvFLAGS(av) = AVf_REIFY;
3122
3123 for (ix = AvFILL(comppad); ix > 0; ix--) {
44a8e56a 3124 if (!SvPADMY(curpad[ix]) && !SvIMMORTAL(curpad[ix]))
a0d0e21e
LW		 3125 SvPADTMP_on(curpad[ix]);
3126 }
79072805 3127
8990e307
LW		 3128 if (AvFILL(comppad_name) < AvFILL(comppad))
3129 av_store(comppad_name, AvFILL(comppad), Nullsv);
79072805 3130
a0d0e21e 3131 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
79072805
LW		 3132 CvSTART(cv) = LINKLIST(CvROOT(cv));
3133 CvROOT(cv)->op_next = 0;
3134 peep(CvSTART(cv));
a6006777 3135
44a8e56a 3136 if (name) {
3137 char *s;
3138
3139 if (perldb && curstash != debstash) {
3140 SV *sv;
3141 SV *tmpstr = sv_newmortal();
3142 static GV *db_postponed;
3143 CV *cv;
3144 HV *hv;
3145
3146 sprintf(buf, "%s:%ld",
3147 SvPVX(GvSV(curcop->cop_filegv)), (long)subline);
3148 sv = newSVpv(buf,0);
3149 sv_catpv(sv,"-");
3150 sprintf(buf,"%ld",(long)curcop->cop_line);
3151 sv_catpv(sv,buf);
3152 gv_efullname3(tmpstr, gv, Nullch);
3153 hv_store(GvHV(DBsub), SvPVX(tmpstr), SvCUR(tmpstr), sv, 0);
3154 if (!db_postponed) {
3155 db_postponed = gv_fetchpv("DB::postponed", TRUE, SVt_PVHV);
3156 }
3157 hv = GvHVn(db_postponed);
3158 if (HvFILL(hv) >= 0 && hv_exists(hv, SvPVX(tmpstr), SvCUR(tmpstr))
3159 && (cv = GvCV(db_postponed))) {
3160 dSP;
3161 PUSHMARK(sp);
3162 XPUSHs(tmpstr);
3163 PUTBACK;
3164 perl_call_sv((SV*)cv, G_DISCARD);
3165 }
3166 }
3167
3168 if ((s = strrchr(name,':')))
28757baa 3169 s++;
3170 else
3171 s = name;
3172 if (strEQ(s, "BEGIN") && !error_count) {
3173 ENTER;
3174 SAVESPTR(compiling.cop_filegv);
3175 SAVEI16(compiling.cop_line);
3176 SAVEI32(perldb);
3177 save_svref(&rs);
3178 sv_setsv(rs, nrs);
3179
3180 if (!beginav)
3181 beginav = newAV();
3182 DEBUG_x( dump_sub(gv) );
3183 av_push(beginav, (SV *)cv);
3184 GvCV(gv) = 0;
3185 calllist(beginav);
a6006777 3186
28757baa 3187 curcop = &compiling;
3188 LEAVE;
3189 }
3190 else if (strEQ(s, "END") && !error_count) {
3191 if (!endav)
3192 endav = newAV();
3193 av_unshift(endav, 1);
3194 av_store(endav, 0, (SV *)cv);
3195 GvCV(gv) = 0;
3196 }
93a17b20 3197 }
a6006777 3198
a6006777 3199 copline = NOLINE;
3200 LEAVE_SCOPE(floor);
a0d0e21e 3201 return cv;
79072805
LW		 3202}
3203
a0d0e21e
LW		 3204#ifdef DEPRECATED
3205CV *
463ee0b2 3206newXSUB(name, ix, subaddr, filename)
79072805
LW		 3207char *name;
3208I32 ix;
3209I32 (*subaddr)();
3210char *filename;
3211{
a0d0e21e 3212 CV* cv = newXS(name, (void(*)())subaddr, filename);
a5f75d66 3213 CvOLDSTYLE_on(cv);
a0d0e21e
LW		 3214 CvXSUBANY(cv).any_i32 = ix;
3215 return cv;
3216}
3217#endif
3218
3219CV *
3220newXS(name, subaddr, filename)
3221char *name;
3222void (*subaddr) _((CV*));
3223char *filename;
3224{
44a8e56a 3225 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
79072805 3226 register CV *cv;
44a8e56a 3227
3228 if (cv = (name ? GvCV(gv) : Nullcv)) {
3229 if (GvCVGEN(gv)) {
3230 /* just a cached method */
3231 SvREFCNT_dec(cv);
3232 cv = 0;
3233 }
3234 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
3235 /* already defined (or promised) */
a0d0e21e
LW		 3236 if (dowarn) {
3237 line_t oldline = curcop->cop_line;
a0d0e21e
LW		 3238 curcop->cop_line = copline;
3239 warn("Subroutine %s redefined",name);
3240 curcop->cop_line = oldline;
3241 }
3242 SvREFCNT_dec(cv);
3243 cv = 0;
79072805 3244 }
79072805 3245 }
44a8e56a 3246
3247 if (cv) /* must reuse cv if autoloaded */
3248 cv_undef(cv);
a0d0e21e
LW		 3249 else {
3250 cv = (CV*)NEWSV(1105,0);
3251 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 3252 if (name) {
3253 GvCV(gv) = cv;
3254 GvCVGEN(gv) = 0;
3255 sub_generation++;
3256 }
a0d0e21e 3257 }
44a8e56a 3258 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
79072805 3259 CvFILEGV(cv) = gv_fetchfile(filename);
a0d0e21e 3260 CvXSUB(cv) = subaddr;
44a8e56a 3261
28757baa 3262 if (name) {
3263 char *s = strrchr(name,':');
3264 if (s)
3265 s++;
3266 else
3267 s = name;
3268 if (strEQ(s, "BEGIN")) {
3269 if (!beginav)
3270 beginav = newAV();
44a8e56a 3271 av_push(beginav, (SV *)cv);
3272 GvCV(gv) = 0;
28757baa 3273 }
3274 else if (strEQ(s, "END")) {
3275 if (!endav)
3276 endav = newAV();
3277 av_unshift(endav, 1);
44a8e56a 3278 av_store(endav, 0, (SV *)cv);
3279 GvCV(gv) = 0;
28757baa 3280 }
3281 }
44a8e56a 3282 else
a5f75d66 3283 CvANON_on(cv);
44a8e56a 3284
a0d0e21e 3285 return cv;
79072805
LW		 3286}
3287
3288void
3289newFORM(floor,op,block)
3290I32 floor;
3291OP *op;
3292OP *block;
3293{
3294 register CV *cv;
3295 char *name;
3296 GV *gv;
a0d0e21e 3297 I32 ix;
79072805
LW		 3298
3299 if (op)
463ee0b2 3300 name = SvPVx(cSVOP->op_sv, na);
79072805
LW		 3301 else
3302 name = "STDOUT";
85e6fe83 3303 gv = gv_fetchpv(name,TRUE, SVt_PVFM);
a5f75d66 3304 GvMULTI_on(gv);
79072805
LW		 3305 if (cv = GvFORM(gv)) {
3306 if (dowarn) {
3307 line_t oldline = curcop->cop_line;
3308
3309 curcop->cop_line = copline;
3310 warn("Format %s redefined",name);
3311 curcop->cop_line = oldline;
3312 }
8990e307 3313 SvREFCNT_dec(cv);
79072805 3314 }
748a9306 3315 cv = compcv;
79072805 3316 GvFORM(gv) = cv;
44a8e56a 3317 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
79072805
LW		 3318 CvFILEGV(cv) = curcop->cop_filegv;
3319
a0d0e21e 3320 for (ix = AvFILL(comppad); ix > 0; ix--) {
44a8e56a 3321 if (!SvPADMY(curpad[ix]) && !SvIMMORTAL(curpad[ix]))
a0d0e21e
LW		 3322 SvPADTMP_on(curpad[ix]);
3323 }
3324
79072805
LW		 3325 CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
3326 CvSTART(cv) = LINKLIST(CvROOT(cv));
3327 CvROOT(cv)->op_next = 0;
3328 peep(CvSTART(cv));
79072805
LW		 3329 op_free(op);
3330 copline = NOLINE;
8990e307 3331 LEAVE_SCOPE(floor);
79072805
LW		 3332}
3333
3334OP *
79072805
LW		 3335newANONLIST(op)
3336OP* op;
3337{
93a17b20 3338 return newUNOP(OP_REFGEN, 0,
a0d0e21e 3339 mod(list(convert(OP_ANONLIST, 0, op)), OP_REFGEN));
79072805
LW		 3340}
3341
3342OP *
3343newANONHASH(op)
3344OP* op;
3345{
93a17b20 3346 return newUNOP(OP_REFGEN, 0,
a0d0e21e
LW		 3347 mod(list(convert(OP_ANONHASH, 0, op)), OP_REFGEN));
3348}
3349
3350OP *
4633a7c4 3351newANONSUB(floor, proto, block)
a0d0e21e 3352I32 floor;
4633a7c4 3353OP *proto;
a0d0e21e
LW		 3354OP *block;
3355{
3356 return newUNOP(OP_REFGEN, 0,
4633a7c4 3357 newSVOP(OP_ANONCODE, 0, (SV*)newSUB(floor, 0, proto, block)));
79072805
LW		 3358}
3359
3360OP *
3361oopsAV(o)
3362OP *o;
3363{
ed6116ce
LW		 3364 switch (o->op_type) {
3365 case OP_PADSV:
3366 o->op_type = OP_PADAV;
3367 o->op_ppaddr = ppaddr[OP_PADAV];
3368 return ref(newUNOP(OP_RV2AV, 0, scalar(o)), OP_RV2AV);
3369
3370 case OP_RV2SV:
79072805
LW		 3371 o->op_type = OP_RV2AV;
3372 o->op_ppaddr = ppaddr[OP_RV2AV];
3373 ref(o, OP_RV2AV);
ed6116ce
LW		 3374 break;
3375
3376 default:
79072805 3377 warn("oops: oopsAV");
ed6116ce
LW		 3378 break;
3379 }
79072805
LW		 3380 return o;
3381}
3382
3383OP *
3384oopsHV(o)
3385OP *o;
3386{
ed6116ce
LW		 3387 switch (o->op_type) {
3388 case OP_PADSV:
3389 case OP_PADAV:
3390 o->op_type = OP_PADHV;
3391 o->op_ppaddr = ppaddr[OP_PADHV];
3392 return ref(newUNOP(OP_RV2HV, 0, scalar(o)), OP_RV2HV);
3393
3394 case OP_RV2SV:
3395 case OP_RV2AV:
79072805
LW		 3396 o->op_type = OP_RV2HV;
3397 o->op_ppaddr = ppaddr[OP_RV2HV];
3398 ref(o, OP_RV2HV);
ed6116ce
LW		 3399 break;
3400
3401 default:
79072805 3402 warn("oops: oopsHV");
ed6116ce
LW		 3403 break;
3404 }
79072805
LW		 3405 return o;
3406}
3407
3408OP *
3409newAVREF(o)
3410OP *o;
3411{
ed6116ce
LW		 3412 if (o->op_type == OP_PADANY) {
3413 o->op_type = OP_PADAV;
3414 o->op_ppaddr = ppaddr[OP_PADAV];
93a17b20 3415 return o;
ed6116ce 3416 }
79072805
LW		 3417 return newUNOP(OP_RV2AV, 0, scalar(o));
3418}
3419
3420OP *
a0d0e21e
LW		 3421newGVREF(type,o)
3422I32 type;
79072805
LW		 3423OP *o;
3424{
a0d0e21e
LW		 3425 if (type == OP_MAPSTART)
3426 return newUNOP(OP_NULL, 0, o);
748a9306 3427 return ref(newUNOP(OP_RV2GV, OPf_REF, o), type);
79072805
LW		 3428}
3429
3430OP *
3431newHVREF(o)
3432OP *o;
3433{
ed6116ce
LW		 3434 if (o->op_type == OP_PADANY) {
3435 o->op_type = OP_PADHV;
3436 o->op_ppaddr = ppaddr[OP_PADHV];
93a17b20 3437 return o;
ed6116ce 3438 }
79072805
LW		 3439 return newUNOP(OP_RV2HV, 0, scalar(o));
3440}
3441
3442OP *
3443oopsCV(o)
3444OP *o;
3445{
463ee0b2 3446 croak("NOT IMPL LINE %d",__LINE__);
79072805
LW		 3447 /* STUB */
3448 return o;
3449}
3450
3451OP *
c07a80fd 3452newCVREF(flags, o)
3453I32 flags;
79072805
LW		 3454OP *o;
3455{
c07a80fd 3456 return newUNOP(OP_RV2CV, flags, scalar(o));
79072805
LW		 3457}
3458
3459OP *
3460newSVREF(o)
3461OP *o;
3462{
ed6116ce
LW		 3463 if (o->op_type == OP_PADANY) {
3464 o->op_type = OP_PADSV;
3465 o->op_ppaddr = ppaddr[OP_PADSV];
93a17b20 3466 return o;
ed6116ce 3467 }
79072805
LW		 3468 return newUNOP(OP_RV2SV, 0, scalar(o));
3469}
3470
3471/* Check routines. */
3472
3473OP *
5f05dabc 3474ck_anoncode(op)
3475OP *op;
3476{
178c6305
CS		 3477 PADOFFSET ix;
3478 SV* name;
3479
3480 name = NEWSV(1106,0);
3481 sv_upgrade(name, SVt_PVNV);
3482 sv_setpvn(name, "&", 1);
3483 SvIVX(name) = -1;
3484 SvNVX(name) = 1;
3485 ix = pad_alloc(op->op_type, SVs_PADMY);
3486 av_store(comppad_name, ix, name);
5f05dabc 3487 av_store(comppad, ix, cSVOP->op_sv);
3488 SvPADMY_on(cSVOP->op_sv);
3489 cSVOP->op_sv = Nullsv;
3490 cSVOP->op_targ = ix;
3491 return op;
3492}
3493
3494OP *
55497cff 3495ck_bitop(op)
3496OP *op;
3497{
3498 op->op_private = hints;
3499 return op;
3500}
3501
3502OP *
79072805
LW		 3503ck_concat(op)
3504OP *op;
3505{
3506 if (cUNOP->op_first->op_type == OP_CONCAT)
3507 op->op_flags |= OPf_STACKED;
3508 return op;
3509}
3510
3511OP *
a0d0e21e 3512ck_spair(op)
79072805
LW		 3513OP *op;
3514{
3515 if (op->op_flags & OPf_KIDS) {
3516 OP* newop;
a0d0e21e 3517 OP* kid;
8ebc5c01 3518 OPCODE type = op->op_type;
3519 op = modkids(ck_fun(op), type);
a0d0e21e
LW		 3520 kid = cUNOP->op_first;
3521 newop = kUNOP->op_first->op_sibling;
3522 if (newop &&
3523 (newop->op_sibling ||
3524 !(opargs[newop->op_type] & OA_RETSCALAR) ||
3525 newop->op_type == OP_PADAV || newop->op_type == OP_PADHV ||
3526 newop->op_type == OP_RV2AV || newop->op_type == OP_RV2HV)) {
3527
79072805 3528 return op;
a0d0e21e
LW		 3529 }
3530 op_free(kUNOP->op_first);
3531 kUNOP->op_first = newop;
3532 }
3533 op->op_ppaddr = ppaddr[++op->op_type];
3534 return ck_fun(op);
3535}
3536
3537OP *
3538ck_delete(op)
3539OP *op;
3540{
3541 op = ck_fun(op);
5f05dabc 3542 op->op_private = 0;
a0d0e21e
LW		 3543 if (op->op_flags & OPf_KIDS) {
3544 OP *kid = cUNOP->op_first;
5f05dabc 3545 if (kid->op_type == OP_HSLICE)
3546 op->op_private |= OPpSLICE;
3547 else if (kid->op_type != OP_HELEM)
3548 croak("%s argument is not a HASH element or slice",
3549 op_desc[op->op_type]);
a0d0e21e 3550 null(kid);
79072805 3551 }
79072805
LW		 3552 return op;
3553}
3554
3555OP *
3556ck_eof(op)
3557OP *op;
3558{
3559 I32 type = op->op_type;
3560
8990e307
LW		 3561 if (op->op_flags & OPf_KIDS) {
3562 if (cLISTOP->op_first->op_type == OP_STUB) {
3563 op_free(op);
3564 op = newUNOP(type, OPf_SPECIAL,
85e6fe83 3565 newGVOP(OP_GV, 0, gv_fetchpv("main'ARGV", TRUE, SVt_PVAV)));
8990e307 3566 }
79072805 3567 return ck_fun(op);
79072805
LW		 3568 }
3569 return op;
3570}
3571
3572OP *
3573ck_eval(op)
3574OP *op;
3575{
85e6fe83 3576 hints |= HINT_BLOCK_SCOPE;
79072805
LW		 3577 if (op->op_flags & OPf_KIDS) {
3578 SVOP *kid = (SVOP*)cUNOP->op_first;
3579
93a17b20
LW		 3580 if (!kid) {
3581 op->op_flags &= ~OPf_KIDS;
8990e307 3582 null(op);
79072805
LW		 3583 }
3584 else if (kid->op_type == OP_LINESEQ) {
3585 LOGOP *enter;
3586
3587 kid->op_next = op->op_next;
3588 cUNOP->op_first = 0;
3589 op_free(op);
3590
3591 Newz(1101, enter, 1, LOGOP);
3592 enter->op_type = OP_ENTERTRY;
3593 enter->op_ppaddr = ppaddr[OP_ENTERTRY];
3594 enter->op_private = 0;
3595
3596 /* establish postfix order */
3597 enter->op_next = (OP*)enter;
3598
463ee0b2 3599 op = prepend_elem(OP_LINESEQ, (OP*)enter, (OP*)kid);
79072805
LW		 3600 op->op_type = OP_LEAVETRY;
3601 op->op_ppaddr = ppaddr[OP_LEAVETRY];
3602 enter->op_other = op;
3603 return op;
3604 }
3605 }
3606 else {
3607 op_free(op);
3608 op = newUNOP(OP_ENTEREVAL, 0, newSVREF(newGVOP(OP_GV, 0, defgv)));
3609 }
a0d0e21e 3610 op->op_targ = (PADOFFSET)hints;
79072805
LW		 3611 return op;
3612}
3613
3614OP *
3615ck_exec(op)
3616OP *op;
3617{
3618 OP *kid;
79072805 3619 if (op->op_flags & OPf_STACKED) {
463ee0b2 3620 op = ck_fun(op);
79072805 3621 kid = cUNOP->op_first->op_sibling;
8990e307
LW		 3622 if (kid->op_type == OP_RV2GV)
3623 null(kid);
79072805 3624 }
463ee0b2
LW		 3625 else
3626 op = listkids(op);
79072805
LW		 3627 return op;
3628}
3629
3630OP *
5f05dabc 3631ck_exists(op)
3632OP *op;
3633{
3634 op = ck_fun(op);
3635 if (op->op_flags & OPf_KIDS) {
3636 OP *kid = cUNOP->op_first;
3637 if (kid->op_type != OP_HELEM)
3638 croak("%s argument is not a HASH element", op_desc[op->op_type]);
3639 null(kid);
3640 }
3641 return op;
3642}
3643
3644OP *
79072805
LW		 3645ck_gvconst(o)
3646register OP *o;
3647{
3648 o = fold_constants(o);
3649 if (o->op_type == OP_CONST)
3650 o->op_type = OP_GV;
3651 return o;
3652}
3653
3654OP *
3655ck_rvconst(op)
3656register OP *op;
3657{
3658 SVOP *kid = (SVOP*)cUNOP->op_first;
85e6fe83 3659
c07a80fd 3660 op->op_private |= (hints & HINT_STRICT_REFS);
79072805 3661 if (kid->op_type == OP_CONST) {
44a8e56a 3662 char *name;
3663 int iscv;
3664 GV *gv;
3665
3666 name = SvPV(kid->op_sv, na);
3667 if ((hints & HINT_STRICT_REFS) && (kid->op_private & OPpCONST_BARE)) {
3668 char *badthing = Nullch;
3669 switch (op->op_type) {
3670 case OP_RV2SV:
3671 badthing = "a SCALAR";
3672 break;
3673 case OP_RV2AV:
3674 badthing = "an ARRAY";
3675 break;
3676 case OP_RV2HV:
3677 badthing = "a HASH";
3678 break;
3679 }
3680 if (badthing)
3681 croak(
3682 "Can't use bareword (\"%s\") as %s ref while \"strict refs\" in use",
3683 name, badthing);
3684 }
79072805 3685 kid->op_type = OP_GV;
44a8e56a 3686 iscv = (op->op_type == OP_RV2CV) * 2;
a0d0e21e 3687 for (gv = 0; !gv; iscv++) {
748a9306
LW		 3688 /*
3689 * This is a little tricky. We only want to add the symbol if we
3690 * didn't add it in the lexer. Otherwise we get duplicate strict
3691 * warnings. But if we didn't add it in the lexer, we must at
3692 * least pretend like we wanted to add it even if it existed before,
3693 * or we get possible typo warnings. OPpCONST_ENTERED says
3694 * whether the lexer already added THIS instance of this symbol.
3695 */
44a8e56a 3696 gv = gv_fetchpv(name,
748a9306 3697 iscv | !(kid->op_private & OPpCONST_ENTERED),
a0d0e21e
LW		 3698 iscv
3699 ? SVt_PVCV
3700 : op->op_type == OP_RV2SV
3701 ? SVt_PV
3702 : op->op_type == OP_RV2AV
3703 ? SVt_PVAV
3704 : op->op_type == OP_RV2HV
3705 ? SVt_PVHV
3706 : SVt_PVGV);
3707 }
adbc6bb1 3708 SvREFCNT_dec(kid->op_sv);
a0d0e21e 3709 kid->op_sv = SvREFCNT_inc(gv);
79072805
LW		 3710 }
3711 return op;
3712}
3713
3714OP *
79072805
LW		 3715ck_ftst(op)
3716OP *op;
3717{
3718 I32 type = op->op_type;
3719
a0d0e21e 3720 if (op->op_flags & OPf_REF)
79072805
LW		 3721 return op;
3722
3723 if (op->op_flags & OPf_KIDS) {
3724 SVOP *kid = (SVOP*)cUNOP->op_first;
3725
3726 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
a0d0e21e 3727 OP *newop = newGVOP(type, OPf_REF,
85e6fe83 3728 gv_fetchpv(SvPVx(kid->op_sv, na), TRUE, SVt_PVIO));
79072805
LW		 3729 op_free(op);
3730 return newop;
3731 }
3732 }
3733 else {
3734 op_free(op);
3735 if (type == OP_FTTTY)
a0d0e21e 3736 return newGVOP(type, OPf_REF, gv_fetchpv("main'STDIN", TRUE,
85e6fe83 3737 SVt_PVIO));
79072805
LW		 3738 else
3739 return newUNOP(type, 0, newSVREF(newGVOP(OP_GV, 0, defgv)));
3740 }
3741 return op;
3742}
3743
3744OP *
3745ck_fun(op)
3746OP *op;
3747{
3748 register OP *kid;
3749 OP **tokid;
3750 OP *sibl;
3751 I32 numargs = 0;
a0d0e21e
LW		 3752 int type = op->op_type;
3753 register I32 oa = opargs[type] >> OASHIFT;
79072805
LW		 3754
3755 if (op->op_flags & OPf_STACKED) {
3756 if ((oa & OA_OPTIONAL) && (oa >> 4) && !((oa >> 4) & OA_OPTIONAL))
3757 oa &= ~OA_OPTIONAL;
3758 else
3759 return no_fh_allowed(op);
3760 }
3761
3762 if (op->op_flags & OPf_KIDS) {
3763 tokid = &cLISTOP->op_first;
3764 kid = cLISTOP->op_first;
8990e307
LW		 3765 if (kid->op_type == OP_PUSHMARK ||
3766 kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK)
3767 {
79072805
LW		 3768 tokid = &kid->op_sibling;
3769 kid = kid->op_sibling;
3770 }
a0d0e21e
LW		 3771 if (!kid && opargs[type] & OA_DEFGV)
3772 *tokid = kid = newSVREF(newGVOP(OP_GV, 0, defgv));
79072805
LW		 3773
3774 while (oa && kid) {
3775 numargs++;
3776 sibl = kid->op_sibling;
3777 switch (oa & 7) {
3778 case OA_SCALAR:
3779 scalar(kid);
3780 break;
3781 case OA_LIST:
3782 if (oa < 16) {
3783 kid = 0;
3784 continue;
3785 }
3786 else
3787 list(kid);
3788 break;
3789 case OA_AVREF:
3790 if (kid->op_type == OP_CONST &&
3791 (kid->op_private & OPpCONST_BARE)) {
463ee0b2 3792 char *name = SvPVx(((SVOP*)kid)->op_sv, na);
79072805 3793 OP *newop = newAVREF(newGVOP(OP_GV, 0,
85e6fe83 3794 gv_fetchpv(name, TRUE, SVt_PVAV) ));
463ee0b2
LW		 3795 if (dowarn)
3796 warn("Array @%s missing the @ in argument %d of %s()",
c07a80fd 3797 name, numargs, op_desc[type]);
79072805
LW		 3798 op_free(kid);
3799 kid = newop;
3800 kid->op_sibling = sibl;
3801 *tokid = kid;
3802 }
8990e307 3803 else if (kid->op_type != OP_RV2AV && kid->op_type != OP_PADAV)
c07a80fd 3804 bad_type(numargs, "array", op_desc[op->op_type], kid);
a0d0e21e 3805 mod(kid, type);
79072805
LW		 3806 break;
3807 case OA_HVREF:
3808 if (kid->op_type == OP_CONST &&
3809 (kid->op_private & OPpCONST_BARE)) {
463ee0b2 3810 char *name = SvPVx(((SVOP*)kid)->op_sv, na);
79072805 3811 OP *newop = newHVREF(newGVOP(OP_GV, 0,
85e6fe83 3812 gv_fetchpv(name, TRUE, SVt_PVHV) ));
463ee0b2
LW		 3813 if (dowarn)
3814 warn("Hash %%%s missing the %% in argument %d of %s()",
c07a80fd 3815 name, numargs, op_desc[type]);
79072805
LW		 3816 op_free(kid);
3817 kid = newop;
3818 kid->op_sibling = sibl;
3819 *tokid = kid;
3820 }
8990e307 3821 else if (kid->op_type != OP_RV2HV && kid->op_type != OP_PADHV)
c07a80fd 3822 bad_type(numargs, "hash", op_desc[op->op_type], kid);
a0d0e21e 3823 mod(kid, type);
79072805
LW		 3824 break;
3825 case OA_CVREF:
3826 {
a0d0e21e 3827 OP *newop = newUNOP(OP_NULL, 0, kid);
79072805
LW		 3828 kid->op_sibling = 0;
3829 linklist(kid);
3830 newop->op_next = newop;
3831 kid = newop;
3832 kid->op_sibling = sibl;
3833 *tokid = kid;
3834 }
3835 break;
3836 case OA_FILEREF:
3837 if (kid->op_type != OP_GV) {
3838 if (kid->op_type == OP_CONST &&
3839 (kid->op_private & OPpCONST_BARE)) {
3840 OP *newop = newGVOP(OP_GV, 0,
85e6fe83
LW		 3841 gv_fetchpv(SvPVx(((SVOP*)kid)->op_sv, na), TRUE,
3842 SVt_PVIO) );
79072805
LW		 3843 op_free(kid);
3844 kid = newop;
3845 }
3846 else {
3847 kid->op_sibling = 0;
3848 kid = newUNOP(OP_RV2GV, 0, scalar(kid));
3849 }
3850 kid->op_sibling = sibl;
3851 *tokid = kid;
3852 }
3853 scalar(kid);
3854 break;
3855 case OA_SCALARREF:
a0d0e21e 3856 mod(scalar(kid), type);
79072805
LW		 3857 break;
3858 }
3859 oa >>= 4;
3860 tokid = &kid->op_sibling;
3861 kid = kid->op_sibling;
3862 }
c07a80fd 3863 op->op_private |= numargs;
79072805 3864 if (kid)
c07a80fd 3865 return too_many_arguments(op,op_desc[op->op_type]);
79072805
LW		 3866 listkids(op);
3867 }
a0d0e21e
LW		 3868 else if (opargs[type] & OA_DEFGV) {
3869 op_free(op);
3870 return newUNOP(type, 0, newSVREF(newGVOP(OP_GV, 0, defgv)));
3871 }
3872
79072805
LW		 3873 if (oa) {
3874 while (oa & OA_OPTIONAL)
3875 oa >>= 4;
3876 if (oa && oa != OA_LIST)
c07a80fd 3877 return too_few_arguments(op,op_desc[op->op_type]);
79072805
LW		 3878 }
3879 return op;
3880}
3881
3882OP *
3883ck_glob(op)
3884OP *op;
3885{
b1cb66bf 3886 GV *gv = gv_fetchpv("glob", FALSE, SVt_PVCV);
3887
3888 if (gv && GvIMPORTED_CV(gv)) {
3889 op->op_type = OP_LIST;
3890 op->op_ppaddr = ppaddr[OP_LIST];
3891 op = newUNOP(OP_ENTERSUB, OPf_STACKED,
3892 append_elem(OP_LIST, op,
3893 scalar(newUNOP(OP_RV2CV, 0,
3894 newGVOP(OP_GV, 0, gv)))));
3895 return ck_subr(op);
3896 }
0a753a76 3897 if ((op->op_flags & OPf_KIDS) && !cLISTOP->op_first->op_sibling)
3898 append_elem(OP_GLOB, op, newSVREF(newGVOP(OP_GV, 0, defgv)));
b1cb66bf 3899 gv = newGVgen("main");
a0d0e21e 3900 gv_IOadd(gv);
79072805
LW		 3901 append_elem(OP_GLOB, op, newGVOP(OP_GV, 0, gv));
3902 scalarkids(op);
a0d0e21e 3903 return ck_fun(op);
79072805
LW		 3904}
3905
3906OP *
3907ck_grep(op)
3908OP *op;
3909{
3910 LOGOP *gwop;
3911 OP *kid;
a0d0e21e 3912 OPCODE type = op->op_type == OP_GREPSTART ? OP_GREPWHILE : OP_MAPWHILE;
79072805 3913
a0d0e21e
LW		 3914 op->op_ppaddr = ppaddr[OP_GREPSTART];
3915 Newz(1101, gwop, 1, LOGOP);
3916
93a17b20 3917 if (op->op_flags & OPf_STACKED) {
a0d0e21e 3918 OP* k;
93a17b20 3919 op = ck_sort(op);
8e07c86e 3920 kid = cLISTOP->op_first->op_sibling;
a0d0e21e
LW		 3921 for (k = cLISTOP->op_first->op_sibling->op_next; k; k = k->op_next) {
3922 kid = k;
3923 }
3924 kid->op_next = (OP*)gwop;
93a17b20
LW		 3925 op->op_flags &= ~OPf_STACKED;
3926 }
a0d0e21e
LW		 3927 kid = cLISTOP->op_first->op_sibling;
3928 if (type == OP_MAPWHILE)
3929 list(kid);
3930 else
3931 scalar(kid);
79072805
LW		 3932 op = ck_fun(op);
3933 if (error_count)
3934 return op;
a0d0e21e 3935 kid = cLISTOP->op_first->op_sibling;
79072805 3936 if (kid->op_type != OP_NULL)
463ee0b2 3937 croak("panic: ck_grep");
79072805
LW		 3938 kid = kUNOP->op_first;
3939
a0d0e21e
LW		 3940 gwop->op_type = type;
3941 gwop->op_ppaddr = ppaddr[type];
3942 gwop->op_first = listkids(op);
79072805
LW		 3943 gwop->op_flags |= OPf_KIDS;
3944 gwop->op_private = 1;
3945 gwop->op_other = LINKLIST(kid);
a0d0e21e 3946 gwop->op_targ = pad_alloc(type, SVs_PADTMP);
79072805
LW		 3947 kid->op_next = (OP*)gwop;
3948
a0d0e21e
LW		 3949 kid = cLISTOP->op_first->op_sibling;
3950 if (!kid || !kid->op_sibling)
c07a80fd 3951 return too_few_arguments(op,op_desc[op->op_type]);
a0d0e21e
LW		 3952 for (kid = kid->op_sibling; kid; kid = kid->op_sibling)
3953 mod(kid, OP_GREPSTART);
3954
79072805
LW		 3955 return (OP*)gwop;
3956}
3957
3958OP *
3959ck_index(op)
3960OP *op;
3961{
3962 if (op->op_flags & OPf_KIDS) {
3963 OP *kid = cLISTOP->op_first->op_sibling; /* get past pushmark */
3964 if (kid && kid->op_type == OP_CONST)
bbce6d69 3965 fbm_compile(((SVOP*)kid)->op_sv);
79072805
LW		 3966 }
3967 return ck_fun(op);
3968}
3969
3970OP *
3971ck_lengthconst(op)
3972OP *op;
3973{
3974 /* XXX length optimization goes here */
a0d0e21e 3975 return ck_fun(op);
79072805
LW		 3976}
3977
3978OP *
3979ck_lfun(op)
3980OP *op;
3981{
8ebc5c01 3982 OPCODE type = op->op_type;
3983 return modkids(ck_fun(op), type);
79072805
LW		 3984}
3985
3986OP *
8990e307
LW		 3987ck_rfun(op)
3988OP *op;
3989{
8ebc5c01 3990 OPCODE type = op->op_type;
3991 return refkids(ck_fun(op), type);
8990e307
LW		 3992}
3993
3994OP *
79072805
LW		 3995ck_listiob(op)
3996OP *op;
3997{
3998 register OP *kid;
3999
4000 kid = cLISTOP->op_first;
4001 if (!kid) {
8990e307 4002 op = force_list(op);
79072805
LW		 4003 kid = cLISTOP->op_first;
4004 }
4005 if (kid->op_type == OP_PUSHMARK)
4006 kid = kid->op_sibling;
4007 if (kid && op->op_flags & OPf_STACKED)
4008 kid = kid->op_sibling;
4009 else if (kid && !kid->op_sibling) { /* print HANDLE; */
4010 if (kid->op_type == OP_CONST && kid->op_private & OPpCONST_BARE) {
4011 op->op_flags |= OPf_STACKED; /* make it a filehandle */
748a9306 4012 kid = newUNOP(OP_RV2GV, OPf_REF, scalar(kid));
79072805
LW		 4013 cLISTOP->op_first->op_sibling = kid;
4014 cLISTOP->op_last = kid;
4015 kid = kid->op_sibling;
4016 }
4017 }
4018
4019 if (!kid)
4020 append_elem(op->op_type, op, newSVREF(newGVOP(OP_GV, 0, defgv)) );
4021
bbce6d69 4022 op = listkids(op);
4023
4024 op->op_private = 0;
36477c24 4025#ifdef USE_LOCALE
bbce6d69 4026 if (hints & HINT_LOCALE)
4027 op->op_private |= OPpLOCALE;
4028#endif
4029
4030 return op;
4031}
4032
4033OP *
4034ck_fun_locale(op)
4035OP *op;
4036{
4037 op = ck_fun(op);
4038
4039 op->op_private = 0;
36477c24 4040#ifdef USE_LOCALE
bbce6d69 4041 if (hints & HINT_LOCALE)
4042 op->op_private |= OPpLOCALE;
4043#endif
4044
4045 return op;
4046}
4047
4048OP *
4049ck_scmp(op)
4050OP *op;
4051{
4052 op->op_private = 0;
36477c24 4053#ifdef USE_LOCALE
bbce6d69 4054 if (hints & HINT_LOCALE)
4055 op->op_private |= OPpLOCALE;
4056#endif
36477c24 4057
bbce6d69 4058 return op;
79072805
LW		 4059}
4060
4061OP *
4062ck_match(op)
4063OP *op;
4064{
4065 cPMOP->op_pmflags |= PMf_RUNTIME;
4633a7c4 4066 cPMOP->op_pmpermflags |= PMf_RUNTIME;
79072805
LW		 4067 return op;
4068}
4069
4070OP *
4071ck_null(op)
4072OP *op;
4073{
4074 return op;
4075}
4076
4077OP *
4078ck_repeat(op)
4079OP *op;
4080{
4081 if (cBINOP->op_first->op_flags & OPf_PARENS) {
c07a80fd 4082 op->op_private |= OPpREPEAT_DOLIST;
8990e307 4083 cBINOP->op_first = force_list(cBINOP->op_first);
79072805
LW		 4084 }
4085 else
4086 scalar(op);
4087 return op;
4088}
4089
4090OP *
8990e307
LW		 4091ck_require(op)
4092OP *op;
4093{
a0d0e21e 4094 if (op->op_flags & OPf_KIDS) { /* Shall we supply missing .pm? */
8990e307
LW		 4095 SVOP *kid = (SVOP*)cUNOP->op_first;
4096
4097 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
8990e307 4098 char *s;
a0d0e21e
LW		 4099 for (s = SvPVX(kid->op_sv); *s; s++) {
4100 if (*s == ':' && s[1] == ':') {
4101 *s = '/';
1aef975c 4102 Move(s+2, s+1, strlen(s+2)+1, char);
a0d0e21e
LW		 4103 --SvCUR(kid->op_sv);
4104 }
8990e307 4105 }
a0d0e21e 4106 sv_catpvn(kid->op_sv, ".pm", 3);
8990e307
LW		 4107 }
4108 }
4109 return ck_fun(op);
4110}
4111
4112OP *
79072805
LW		 4113ck_retarget(op)
4114OP *op;
4115{
463ee0b2 4116 croak("NOT IMPL LINE %d",__LINE__);
79072805
LW		 4117 /* STUB */
4118 return op;
4119}
4120
4121OP *
4122ck_select(op)
4123OP *op;
4124{
c07a80fd 4125 OP* kid;
79072805 4126 if (op->op_flags & OPf_KIDS) {
c07a80fd 4127 kid = cLISTOP->op_first->op_sibling; /* get past pushmark */
2304df62 4128 if (kid && kid->op_sibling) {
79072805
LW		 4129 op->op_type = OP_SSELECT;
4130 op->op_ppaddr = ppaddr[OP_SSELECT];
4131 op = ck_fun(op);
4132 return fold_constants(op);
4133 }
4134 }
c07a80fd 4135 op = ck_fun(op);
4136 kid = cLISTOP->op_first->op_sibling; /* get past pushmark */
4137 if (kid && kid->op_type == OP_RV2GV)
4138 kid->op_private &= ~HINT_STRICT_REFS;
4139 return op;
79072805
LW		 4140}
4141
4142OP *
4143ck_shift(op)
4144OP *op;
4145{
4146 I32 type = op->op_type;
4147
4148 if (!(op->op_flags & OPf_KIDS)) {
4149 op_free(op);
4150 return newUNOP(type, 0,
4151 scalar(newUNOP(OP_RV2AV, 0,
b1cb66bf 4152 scalar(newGVOP(OP_GV, 0, subline
4153 ? defgv
4154 : gv_fetchpv("ARGV", TRUE, SVt_PVAV) )))));
79072805 4155 }
463ee0b2 4156 return scalar(modkids(ck_fun(op), type));
79072805
LW		 4157}
4158
4159OP *
4160ck_sort(op)
4161OP *op;
4162{
bbce6d69 4163 op->op_private = 0;
36477c24 4164#ifdef USE_LOCALE
bbce6d69 4165 if (hints & HINT_LOCALE)
4166 op->op_private |= OPpLOCALE;
4167#endif
4168
79072805
LW		 4169 if (op->op_flags & OPf_STACKED) {
4170 OP *kid = cLISTOP->op_first->op_sibling; /* get past pushmark */
463ee0b2
LW		 4171 OP *k;
4172 kid = kUNOP->op_first; /* get past rv2gv */
79072805 4173
463ee0b2 4174 if (kid->op_type == OP_SCOPE || kid->op_type == OP_LEAVE) {
79072805 4175 linklist(kid);
463ee0b2
LW		 4176 if (kid->op_type == OP_SCOPE) {
4177 k = kid->op_next;
4178 kid->op_next = 0;
79072805 4179 }
463ee0b2 4180 else if (kid->op_type == OP_LEAVE) {
748a9306
LW		 4181 if (op->op_type == OP_SORT) {
4182 null(kid); /* wipe out leave */
4183 kid->op_next = kid;
463ee0b2 4184
748a9306
LW		 4185 for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
4186 if (k->op_next == kid)
4187 k->op_next = 0;
4188 }
463ee0b2 4189 }
748a9306
LW		 4190 else
4191 kid->op_next = 0; /* just disconnect the leave */
a0d0e21e 4192 k = kLISTOP->op_first;
463ee0b2 4193 }
a0d0e21e
LW		 4194 peep(k);
4195
463ee0b2 4196 kid = cLISTOP->op_first->op_sibling; /* get past pushmark */
8990e307 4197 null(kid); /* wipe out rv2gv */
a0d0e21e
LW		 4198 if (op->op_type == OP_SORT)
4199 kid->op_next = kid;
4200 else
4201 kid->op_next = k;
79072805
LW		 4202 op->op_flags |= OPf_SPECIAL;
4203 }
4204 }
bbce6d69 4205
79072805
LW		 4206 return op;
4207}
4208
4209OP *
4210ck_split(op)
4211OP *op;
4212{
4213 register OP *kid;
ed6116ce 4214 PMOP* pm;
79072805
LW		 4215
4216 if (op->op_flags & OPf_STACKED)
4217 return no_fh_allowed(op);
4218
79072805 4219 kid = cLISTOP->op_first;
8990e307 4220 if (kid->op_type != OP_NULL)
463ee0b2 4221 croak("panic: ck_split");
8990e307
LW		 4222 kid = kid->op_sibling;
4223 op_free(cLISTOP->op_first);
4224 cLISTOP->op_first = kid;
85e6fe83 4225 if (!kid) {
8990e307 4226 cLISTOP->op_first = kid = newSVOP(OP_CONST, 0, newSVpv(" ", 1));
85e6fe83
LW		 4227 cLISTOP->op_last = kid; /* There was only one element previously */
4228 }
79072805
LW		 4229
4230 if (kid->op_type != OP_MATCH) {
4231 OP *sibl = kid->op_sibling;
463ee0b2 4232 kid->op_sibling = 0;
79072805
LW		 4233 kid = pmruntime( newPMOP(OP_MATCH, OPf_SPECIAL), kid, Nullop);
4234 if (cLISTOP->op_first == cLISTOP->op_last)
4235 cLISTOP->op_last = kid;
4236 cLISTOP->op_first = kid;
4237 kid->op_sibling = sibl;
4238 }
ed6116ce
LW		 4239 pm = (PMOP*)kid;
4240 if (pm->op_pmshort && !(pm->op_pmflags & PMf_ALL)) {
8990e307 4241 SvREFCNT_dec(pm->op_pmshort); /* can't use substring to optimize */
ed6116ce
LW		 4242 pm->op_pmshort = 0;
4243 }
79072805
LW		 4244
4245 kid->op_type = OP_PUSHRE;
4246 kid->op_ppaddr = ppaddr[OP_PUSHRE];
4247 scalar(kid);
4248
4249 if (!kid->op_sibling)
4250 append_elem(OP_SPLIT, op, newSVREF(newGVOP(OP_GV, 0, defgv)) );
4251
4252 kid = kid->op_sibling;
4253 scalar(kid);
4254
4255 if (!kid->op_sibling)
4256 append_elem(OP_SPLIT, op, newSVOP(OP_CONST, 0, newSViv(0)));
4257
4258 kid = kid->op_sibling;
4259 scalar(kid);
4260
4261 if (kid->op_sibling)
c07a80fd 4262 return too_many_arguments(op,op_desc[op->op_type]);
79072805
LW		 4263
4264 return op;
4265}
4266
4267OP *
4268ck_subr(op)
4269OP *op;
4270{
4633a7c4
LW		 4271 OP *prev = ((cUNOP->op_first->op_sibling)
4272 ? cUNOP : ((UNOP*)cUNOP->op_first))->op_first;
4273 OP *o = prev->op_sibling;
4274 OP *cvop;
4275 char *proto = 0;
4276 CV *cv = 0;
4277 int optional = 0;
4278 I32 arg = 0;
4279
4280 for (cvop = o; cvop->op_sibling; cvop = cvop->op_sibling) ;
4281 if (cvop->op_type == OP_RV2CV) {
4282 SVOP* tmpop;
c07a80fd 4283 op->op_private |= (cvop->op_private & OPpENTERSUB_AMPER);
4633a7c4
LW		 4284 null(cvop); /* disable rv2cv */
4285 tmpop = (SVOP*)((UNOP*)cvop)->op_first;
4286 if (tmpop->op_type == OP_GV) {
8ebc5c01 4287 cv = GvCVu(tmpop->op_sv);
c07a80fd 4288 if (cv && SvPOK(cv) && !(op->op_private & OPpENTERSUB_AMPER))
4633a7c4
LW		 4289 proto = SvPV((SV*)cv,na);
4290 }
4291 }
c07a80fd 4292 op->op_private |= (hints & HINT_STRICT_REFS);
8990e307 4293 if (perldb && curstash != debstash)
c07a80fd 4294 op->op_private |= OPpENTERSUB_DB;
4633a7c4
LW		 4295 while (o != cvop) {
4296 if (proto) {
4297 switch (*proto) {
4298 case '\0':
4299 return too_many_arguments(op, CvNAME(cv));
4300 case ';':
4301 optional = 1;
4302 proto++;
4303 continue;
4304 case '$':
4305 proto++;
4306 arg++;
4307 scalar(o);
4308 break;
4309 case '%':
4310 case '@':
4311 list(o);
4312 arg++;
4313 break;
4314 case '&':
4315 proto++;
4316 arg++;
4317 if (o->op_type != OP_REFGEN && o->op_type != OP_UNDEF)
4318 bad_type(arg, "block", CvNAME(cv), o);
4319 break;
4320 case '*':
4321 proto++;
4322 arg++;
4323 if (o->op_type == OP_RV2GV)
4324 goto wrapref;
4325 {
4326 OP* kid = o;
4327 o = newUNOP(OP_RV2GV, 0, kid);
4328 o->op_sibling = kid->op_sibling;
4329 kid->op_sibling = 0;
4330 prev->op_sibling = o;
4331 }
4332 goto wrapref;
4333 case '\\':
4334 proto++;
4335 arg++;
4336 switch (*proto++) {
4337 case '*':
4338 if (o->op_type != OP_RV2GV)
4339 bad_type(arg, "symbol", CvNAME(cv), o);
4340 goto wrapref;
4341 case '&':
4342 if (o->op_type != OP_RV2CV)
4343 bad_type(arg, "sub", CvNAME(cv), o);
4344 goto wrapref;
4345 case '$':
4346 if (o->op_type != OP_RV2SV && o->op_type != OP_PADSV)
4347 bad_type(arg, "scalar", CvNAME(cv), o);
4348 goto wrapref;
4349 case '@':
4350 if (o->op_type != OP_RV2AV && o->op_type != OP_PADAV)
4351 bad_type(arg, "array", CvNAME(cv), o);
4352 goto wrapref;
4353 case '%':
4354 if (o->op_type != OP_RV2HV && o->op_type != OP_PADHV)
4355 bad_type(arg, "hash", CvNAME(cv), o);
4356 wrapref:
4357 {
4358 OP* kid = o;
4359 o = newUNOP(OP_REFGEN, 0, kid);
4360 o->op_sibling = kid->op_sibling;
4361 kid->op_sibling = 0;
4362 prev->op_sibling = o;
4363 }
4364 break;
4365 default: goto oops;
4366 }
4367 break;
b1cb66bf 4368 case ' ':
4369 proto++;
4370 continue;
4633a7c4
LW		 4371 default:
4372 oops:
4373 croak("Malformed prototype for %s: %s",
4374 CvNAME(cv),SvPV((SV*)cv,na));
4375 }
4376 }
4377 else
4378 list(o);
a0d0e21e 4379 mod(o, OP_ENTERSUB);
4633a7c4
LW		 4380 prev = o;
4381 o = o->op_sibling;
4382 }
4383 if (proto && !optional && *proto == '$')
4384 return too_few_arguments(op, CvNAME(cv));
79072805
LW		 4385 return op;
4386}
4387
4388OP *
8990e307
LW		 4389ck_svconst(op)
4390OP *op;
4391{
4392 SvREADONLY_on(cSVOP->op_sv);
4393 return op;
4394}
4395
4396OP *
79072805
LW		 4397ck_trunc(op)
4398OP *op;
4399{
4400 if (op->op_flags & OPf_KIDS) {
4401 SVOP *kid = (SVOP*)cUNOP->op_first;
4402
a0d0e21e
LW		 4403 if (kid->op_type == OP_NULL)
4404 kid = (SVOP*)kid->op_sibling;
4405 if (kid &&
4406 kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE))
79072805
LW		 4407 op->op_flags |= OPf_SPECIAL;
4408 }
4409 return ck_fun(op);
4410}
4411
463ee0b2
LW		 4412/* A peephole optimizer. We visit the ops in the order they're to execute. */
4413
79072805 4414void
a0d0e21e
LW		 4415peep(o)
4416register OP* o;
79072805
LW		 4417{
4418 register OP* oldop = 0;
a0d0e21e 4419 if (!o || o->op_seq)
79072805 4420 return;
a0d0e21e
LW		 4421 ENTER;
4422 SAVESPTR(op);
4423 SAVESPTR(curcop);
4424 for (; o; o = o->op_next) {
4425 if (o->op_seq)
4426 break;
c07a80fd 4427 if (!op_seqmax)
4428 op_seqmax++;
a0d0e21e
LW		 4429 op = o;
4430 switch (o->op_type) {
4431 case OP_NEXTSTATE:
4432 case OP_DBSTATE:
4433 curcop = ((COP*)o); /* for warnings */
c07a80fd 4434 o->op_seq = op_seqmax++;
a0d0e21e
LW		 4435 break;
4436
4437 case OP_CONCAT:
4438 case OP_CONST:
4439 case OP_JOIN:
4440 case OP_UC:
4441 case OP_UCFIRST:
4442 case OP_LC:
4443 case OP_LCFIRST:
4444 case OP_QUOTEMETA:
4445 if (o->op_next->op_type == OP_STRINGIFY)
4446 null(o->op_next);
c07a80fd 4447 o->op_seq = op_seqmax++;
a0d0e21e 4448 break;
8990e307 4449 case OP_STUB:
a0d0e21e 4450 if ((o->op_flags & (OPf_KNOW|OPf_LIST)) != (OPf_KNOW|OPf_LIST)) {
c07a80fd 4451 o->op_seq = op_seqmax++;
8990e307
LW		 4452 break; /* Scalar stub must produce undef. List stub is noop */
4453 }
748a9306 4454 goto nothin;
79072805 4455 case OP_NULL:
748a9306
LW		 4456 if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
4457 curcop = ((COP*)op);
4458 goto nothin;
79072805 4459 case OP_SCALAR:
93a17b20 4460 case OP_LINESEQ:
463ee0b2 4461 case OP_SCOPE:
748a9306 4462 nothin:
a0d0e21e
LW		 4463 if (oldop && o->op_next) {
4464 oldop->op_next = o->op_next;
79072805
LW		 4465 continue;
4466 }
c07a80fd 4467 o->op_seq = op_seqmax++;
79072805
LW		 4468 break;
4469
4470 case OP_GV:
a0d0e21e 4471 if (o->op_next->op_type == OP_RV2SV) {
5f05dabc 4472 if (!(o->op_next->op_private & OPpDEREF)) {
a0d0e21e
LW		 4473 null(o->op_next);
4474 o->op_private |= o->op_next->op_private & OPpLVAL_INTRO;
4475 o->op_next = o->op_next->op_next;
4476 o->op_type = OP_GVSV;
4477 o->op_ppaddr = ppaddr[OP_GVSV];
8990e307
LW		 4478 }
4479 }
a0d0e21e
LW		 4480 else if (o->op_next->op_type == OP_RV2AV) {
4481 OP* pop = o->op_next->op_next;
4482 IV i;
8990e307 4483 if (pop->op_type == OP_CONST &&
a0d0e21e 4484 (op = pop->op_next) &&
8990e307 4485 pop->op_next->op_type == OP_AELEM &&
5f05dabc 4486 !(pop->op_next->op_private & (OPpDEREF|OPpLVAL_INTRO)) &&
a0d0e21e
LW		 4487 (i = SvIV(((SVOP*)pop)->op_sv) - compiling.cop_arybase)
4488 <= 255 &&
8990e307
LW		 4489 i >= 0)
4490 {
748a9306 4491 SvREFCNT_dec(((SVOP*)pop)->op_sv);
a0d0e21e 4492 null(o->op_next);
8990e307
LW		 4493 null(pop->op_next);
4494 null(pop);
a0d0e21e
LW		 4495 o->op_flags |= pop->op_next->op_flags & OPf_MOD;
4496 o->op_next = pop->op_next->op_next;
4497 o->op_type = OP_AELEMFAST;
4498 o->op_ppaddr = ppaddr[OP_AELEMFAST];
4499 o->op_private = (U8)i;
a6006777 4500 GvAVn(((GVOP*)o)->op_gv);
8990e307 4501 }
79072805 4502 }
c07a80fd 4503 o->op_seq = op_seqmax++;
79072805
LW		 4504 break;
4505
a0d0e21e 4506 case OP_MAPWHILE:
79072805
LW		 4507 case OP_GREPWHILE:
4508 case OP_AND:
4509 case OP_OR:
c07a80fd 4510 o->op_seq = op_seqmax++;
79072805
LW		 4511 peep(cLOGOP->op_other);
4512 break;
4513
4514 case OP_COND_EXPR:
c07a80fd 4515 o->op_seq = op_seqmax++;
79072805
LW		 4516 peep(cCONDOP->op_true);
4517 peep(cCONDOP->op_false);
4518 break;
4519
4520 case OP_ENTERLOOP:
c07a80fd 4521 o->op_seq = op_seqmax++;
79072805
LW		 4522 peep(cLOOP->op_redoop);
4523 peep(cLOOP->op_nextop);
4524 peep(cLOOP->op_lastop);
4525 break;
4526
4527 case OP_MATCH:
4528 case OP_SUBST:
c07a80fd 4529 o->op_seq = op_seqmax++;
a0d0e21e 4530 peep(cPMOP->op_pmreplstart);
79072805
LW		 4531 break;
4532
a0d0e21e 4533 case OP_EXEC:
c07a80fd 4534 o->op_seq = op_seqmax++;
a0d0e21e
LW		 4535 if (dowarn && o->op_next && o->op_next->op_type == OP_NEXTSTATE) {
4536 if (o->op_next->op_sibling &&
4537 o->op_next->op_sibling->op_type != OP_DIE) {
4538 line_t oldline = curcop->cop_line;
4539
4540 curcop->cop_line = ((COP*)o->op_next)->cop_line;
4541 warn("Statement unlikely to be reached");
4542 warn("(Maybe you meant system() when you said exec()?)\n");
4543 curcop->cop_line = oldline;
4544 }
4545 }
4546 break;
79072805 4547 default:
c07a80fd 4548 o->op_seq = op_seqmax++;
79072805
LW		 4549 break;
4550 }
a0d0e21e 4551 oldop = o;
79072805 4552 }
a0d0e21e 4553 LEAVE;
79072805 4554}
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