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a0d0e21e 1/* op.c
79072805 2 *
9607fc9c 3 * Copyright (c) 1991-1997, 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 179 for (cv = startcv; cv; cv = CvOUTSIDE(cv)) {
4fdae800 180 AV *curlist = CvPADLIST(cv);
181 SV **svp = av_fetch(curlist, 0, FALSE);
748a9306 182 AV *curname;
4fdae800 183
748a9306 184 if (!svp || *svp == &sv_undef)
4633a7c4 185 continue;
748a9306
LW		 186 curname = (AV*)*svp;
187 svp = AvARRAY(curname);
188 for (off = AvFILL(curname); off > 0; off--) {
189 if ((sv = svp[off]) &&
190 sv != &sv_undef &&
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) {
9607fc9c 201 if (newoff) {
202 if (SvFAKE(sv))
203 continue;
4fdae800 204 return 0; /* don't clone from inactive stack frame */
9607fc9c 205 }
5f05dabc 206 depth = 1;
207 }
208 oldpad = (AV*)*av_fetch(curlist, depth, FALSE);
209 oldsv = *av_fetch(oldpad, off, TRUE);
748a9306 210 if (!newoff) { /* Not a mere clone operation. */
9607fc9c 211 SV *namesv = NEWSV(1103,0);
748a9306 212 newoff = pad_alloc(OP_PADSV, SVs_PADMY);
9607fc9c 213 sv_upgrade(namesv, SVt_PVNV);
214 sv_setpv(namesv, name);
215 av_store(comppad_name, newoff, namesv);
216 SvNVX(namesv) = (double)curcop->cop_seq;
217 SvIVX(namesv) = 999999999; /* A ref, intro immediately */
218 SvFAKE_on(namesv); /* A ref, not a real var */
774d564b 219 if (CvANON(compcv) || SvTYPE(compcv) == SVt_PVFM) {
28757baa 220 /* "It's closures all the way down." */
221 CvCLONE_on(compcv);
222 if (cv != startcv) {
223 CV *bcv;
224 for (bcv = startcv;
225 bcv && bcv != cv && !CvCLONE(bcv);
226 bcv = CvOUTSIDE(bcv)) {
227 if (CvANON(bcv))
228 CvCLONE_on(bcv);
229 else {
774d564b 230 if (dowarn && !CvUNIQUE(cv))
44a8e56a 231 warn(
232 "Variable \"%s\" may be unavailable",
28757baa 233 name);
234 break;
235 }
236 }
237 }
238 }
44a8e56a 239 else if (!CvUNIQUE(compcv)) {
9607fc9c 240 if (dowarn && !SvFAKE(sv) && !CvUNIQUE(cv))
44a8e56a 241 warn("Variable \"%s\" will not stay shared", name);
5f05dabc 242 }
748a9306
LW		 243 }
244 av_store(comppad, newoff, SvREFCNT_inc(oldsv));
748a9306
LW		 245 return newoff;
246 }
93a17b20
LW		 247 }
248 }
249
250 /* Nothing in current lexical context--try eval's context, if any.
251 * This is necessary to let the perldb get at lexically scoped variables.
252 * XXX This will also probably interact badly with eval tree caching.
253 */
254
a0d0e21e 255 saweval = 0;
748a9306 256 for (i = cx_ix; i >= 0; i--) {
93a17b20
LW		 257 cx = &cxstack[i];
258 switch (cx->cx_type) {
259 default:
748a9306
LW		 260 if (i == 0 && saweval) {
261 seq = cxstack[saweval].blk_oldcop->cop_seq;
262 return pad_findlex(name, newoff, seq, main_cv, 0);
263 }
93a17b20
LW		 264 break;
265 case CXt_EVAL:
44a8e56a 266 switch (cx->blk_eval.old_op_type) {
267 case OP_ENTEREVAL:
268 saweval = i;
269 break;
270 case OP_REQUIRE:
271 /* require must have its own scope */
272 return 0;
273 }
93a17b20
LW		 274 break;
275 case CXt_SUB:
276 if (!saweval)
277 return 0;
278 cv = cx->blk_sub.cv;
748a9306
LW		 279 if (debstash && CvSTASH(cv) == debstash) { /* ignore DB'* scope */
280 saweval = i; /* so we know where we were called from */
93a17b20 281 continue;
93a17b20 282 }
748a9306
LW		 283 seq = cxstack[saweval].blk_oldcop->cop_seq;
284 return pad_findlex(name, newoff, seq, cv, i-1);
93a17b20
LW		 285 }
286 }
287
748a9306
LW		 288 return 0;
289}
a0d0e21e 290
748a9306
LW		 291PADOFFSET
292pad_findmy(name)
293char *name;
294{
295 I32 off;
296 SV *sv;
297 SV **svp = AvARRAY(comppad_name);
bbce6d69 298 U32 seq = cop_seqmax;
748a9306
LW		 299
300 /* The one we're looking for is probably just before comppad_name_fill. */
4633a7c4 301 for (off = AvFILL(comppad_name); off > 0; off--) {
a0d0e21e
LW		 302 if ((sv = svp[off]) &&
303 sv != &sv_undef &&
304 seq <= SvIVX(sv) &&
13826f2c 305 seq > I_32(SvNVX(sv)) &&
a0d0e21e
LW		 306 strEQ(SvPVX(sv), name))
307 {
748a9306 308 return (PADOFFSET)off;
a0d0e21e
LW		 309 }
310 }
748a9306
LW		 311
312 /* See if it's in a nested scope */
313 off = pad_findlex(name, 0, seq, CvOUTSIDE(compcv), cxstack_ix);
314 if (off)
315 return off;
316
93a17b20
LW		 317 return 0;
318}
319
320void
321pad_leavemy(fill)
322I32 fill;
323{
324 I32 off;
8990e307 325 SV **svp = AvARRAY(comppad_name);
93a17b20 326 SV *sv;
8990e307
LW		 327 if (min_intro_pending && fill < min_intro_pending) {
328 for (off = max_intro_pending; off >= min_intro_pending; off--) {
a0d0e21e 329 if ((sv = svp[off]) && sv != &sv_undef)
8990e307
LW		 330 warn("%s never introduced", SvPVX(sv));
331 }
332 }
333 /* "Deintroduce" my variables that are leaving with this scope. */
334 for (off = AvFILL(comppad_name); off > fill; off--) {
748a9306 335 if ((sv = svp[off]) && sv != &sv_undef && SvIVX(sv) == 999999999)
463ee0b2 336 SvIVX(sv) = cop_seqmax;
93a17b20
LW		 337 }
338}
339
340PADOFFSET
79072805
LW		 341pad_alloc(optype,tmptype)
342I32 optype;
ed6116ce 343U32 tmptype;
79072805
LW		 344{
345 SV *sv;
346 I32 retval;
347
348 if (AvARRAY(comppad) != curpad)
463ee0b2 349 croak("panic: pad_alloc");
a0d0e21e
LW		 350 if (pad_reset_pending)
351 pad_reset();
ed6116ce 352 if (tmptype & SVs_PADMY) {
79072805
LW		 353 do {
354 sv = *av_fetch(comppad, AvFILL(comppad) + 1, TRUE);
ed6116ce 355 } while (SvPADBUSY(sv)); /* need a fresh one */
79072805
LW		 356 retval = AvFILL(comppad);
357 }
358 else {
bbce6d69 359 SV **names = AvARRAY(comppad_name);
360 SSize_t names_fill = AvFILL(comppad_name);
361 for (;;) {
362 /*
363 * "foreach" index vars temporarily become aliases to non-"my"
364 * values. Thus we must skip, not just pad values that are
365 * marked as current pad values, but also those with names.
366 */
367 if (++padix <= names_fill &&
368 (sv = names[padix]) && sv != &sv_undef)
369 continue;
370 sv = *av_fetch(comppad, padix, TRUE);
371 if (!(SvFLAGS(sv) & (SVs_PADTMP|SVs_PADMY)))
372 break;
373 }
79072805
LW		 374 retval = padix;
375 }
8990e307 376 SvFLAGS(sv) |= tmptype;
79072805 377 curpad = AvARRAY(comppad);
760ac839 378 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad alloc %ld for %s\n", (long) retval, op_name[optype]));
79072805
LW		 379 return (PADOFFSET)retval;
380}
381
382SV *
a0d0e21e 383#ifndef CAN_PROTOTYPE
79072805
LW		 384pad_sv(po)
385PADOFFSET po;
8990e307
LW		 386#else
387pad_sv(PADOFFSET po)
a0d0e21e 388#endif /* CAN_PROTOTYPE */
79072805
LW		 389{
390 if (!po)
463ee0b2 391 croak("panic: pad_sv po");
760ac839 392 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad sv %d\n", po));
79072805
LW		 393 return curpad[po]; /* eventually we'll turn this into a macro */
394}
395
396void
a0d0e21e 397#ifndef CAN_PROTOTYPE
79072805
LW		 398pad_free(po)
399PADOFFSET po;
8990e307
LW		 400#else
401pad_free(PADOFFSET po)
a0d0e21e 402#endif /* CAN_PROTOTYPE */
79072805 403{
a0d0e21e
LW		 404 if (!curpad)
405 return;
79072805 406 if (AvARRAY(comppad) != curpad)
463ee0b2 407 croak("panic: pad_free curpad");
79072805 408 if (!po)
463ee0b2 409 croak("panic: pad_free po");
760ac839 410 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad free %d\n", po));
ff0cee69 411 if (curpad[po] && !SvIMMORTAL(curpad[po]))
ed6116ce 412 SvPADTMP_off(curpad[po]);
a0d0e21e 413 if ((I32)po < padix)
79072805
LW		 414 padix = po - 1;
415}
416
417void
a0d0e21e 418#ifndef CAN_PROTOTYPE
79072805
LW		 419pad_swipe(po)
420PADOFFSET po;
8990e307
LW		 421#else
422pad_swipe(PADOFFSET po)
a0d0e21e 423#endif /* CAN_PROTOTYPE */
79072805
LW		 424{
425 if (AvARRAY(comppad) != curpad)
463ee0b2 426 croak("panic: pad_swipe curpad");
79072805 427 if (!po)
463ee0b2 428 croak("panic: pad_swipe po");
760ac839 429 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad swipe %d\n", po));
ed6116ce 430 SvPADTMP_off(curpad[po]);
a0d0e21e
LW		 431 curpad[po] = NEWSV(1107,0);
432 SvPADTMP_on(curpad[po]);
433 if ((I32)po < padix)
79072805
LW		 434 padix = po - 1;
435}
436
437void
438pad_reset()
439{
440 register I32 po;
441
442 if (AvARRAY(comppad) != curpad)
463ee0b2 443 croak("panic: pad_reset curpad");
760ac839 444 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad reset\n"));
748a9306
LW		 445 if (!tainting) { /* Can't mix tainted and non-tainted temporaries. */
446 for (po = AvMAX(comppad); po > padix_floor; po--) {
ff0cee69 447 if (curpad[po] && !SvIMMORTAL(curpad[po]))
748a9306
LW		 448 SvPADTMP_off(curpad[po]);
449 }
450 padix = padix_floor;
79072805 451 }
a0d0e21e 452 pad_reset_pending = FALSE;
79072805
LW		 453}
454
455/* Destructor */
456
457void
458op_free(op)
459OP *op;
460{
85e6fe83 461 register OP *kid, *nextkid;
79072805 462
b1cb66bf 463 if (!op || op->op_seq == (U16)-1)
79072805
LW		 464 return;
465
466 if (op->op_flags & OPf_KIDS) {
85e6fe83
LW		 467 for (kid = cUNOP->op_first; kid; kid = nextkid) {
468 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 469 op_free(kid);
85e6fe83 470 }
79072805
LW		 471 }
472
79072805 473 switch (op->op_type) {
8990e307
LW		 474 case OP_NULL:
475 op->op_targ = 0; /* Was holding old type, if any. */
476 break;
a0d0e21e
LW		 477 case OP_ENTEREVAL:
478 op->op_targ = 0; /* Was holding hints. */
479 break;
a6006777 480 default:
481 if (!(op->op_flags & OPf_REF) || (check[op->op_type] != ck_ftst))
482 break;
483 /* FALL THROUGH */
463ee0b2 484 case OP_GVSV:
79072805 485 case OP_GV:
a6006777 486 case OP_AELEMFAST:
a0d0e21e 487 SvREFCNT_dec(cGVOP->op_gv);
8990e307
LW		 488 break;
489 case OP_NEXTSTATE:
490 case OP_DBSTATE:
5f05dabc 491 Safefree(cCOP->cop_label);
8990e307 492 SvREFCNT_dec(cCOP->cop_filegv);
79072805
LW		 493 break;
494 case OP_CONST:
8990e307 495 SvREFCNT_dec(cSVOP->op_sv);
79072805 496 break;
748a9306
LW		 497 case OP_GOTO:
498 case OP_NEXT:
499 case OP_LAST:
500 case OP_REDO:
501 if (op->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
502 break;
503 /* FALL THROUGH */
a0d0e21e
LW		 504 case OP_TRANS:
505 Safefree(cPVOP->op_pv);
506 break;
507 case OP_SUBST:
508 op_free(cPMOP->op_pmreplroot);
509 /* FALL THROUGH */
748a9306 510 case OP_PUSHRE:
a0d0e21e 511 case OP_MATCH:
e50aee73 512 pregfree(cPMOP->op_pmregexp);
748a9306 513 SvREFCNT_dec(cPMOP->op_pmshort);
a0d0e21e 514 break;
79072805
LW		 515 }
516
8990e307
LW		 517 if (op->op_targ > 0)
518 pad_free(op->op_targ);
519
79072805
LW		 520 Safefree(op);
521}
522
8990e307
LW		 523static void
524null(op)
525OP* op;
526{
527 if (op->op_type != OP_NULL && op->op_targ > 0)
528 pad_free(op->op_targ);
529 op->op_targ = op->op_type;
530 op->op_type = OP_NULL;
531 op->op_ppaddr = ppaddr[OP_NULL];
532}
533
79072805
LW		 534/* Contextualizers */
535
463ee0b2 536#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 537
538OP *
539linklist(op)
540OP *op;
541{
542 register OP *kid;
543
544 if (op->op_next)
545 return op->op_next;
546
547 /* establish postfix order */
548 if (cUNOP->op_first) {
549 op->op_next = LINKLIST(cUNOP->op_first);
550 for (kid = cUNOP->op_first; kid; kid = kid->op_sibling) {
551 if (kid->op_sibling)
552 kid->op_next = LINKLIST(kid->op_sibling);
553 else
554 kid->op_next = op;
555 }
556 }
557 else
558 op->op_next = op;
559
560 return op->op_next;
561}
562
563OP *
564scalarkids(op)
565OP *op;
566{
567 OP *kid;
568 if (op && op->op_flags & OPf_KIDS) {
569 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
570 scalar(kid);
571 }
572 return op;
573}
574
a0d0e21e 575static OP *
8990e307
LW		 576scalarboolean(op)
577OP *op;
578{
579 if (dowarn &&
a0d0e21e
LW		 580 op->op_type == OP_SASSIGN && cBINOP->op_first->op_type == OP_CONST) {
581 line_t oldline = curcop->cop_line;
582
583 if (copline != NOLINE)
584 curcop->cop_line = copline;
585 warn("Found = in conditional, should be ==");
586 curcop->cop_line = oldline;
587 }
8990e307
LW		 588 return scalar(op);
589}
590
591OP *
79072805
LW		 592scalar(op)
593OP *op;
594{
595 OP *kid;
596
a0d0e21e 597 /* assumes no premature commitment */
36477c24 598 if (!op || (op->op_flags & OPf_KNOW) || op->op_type == OP_RETURN
599 || error_count)
79072805
LW		 600 return op;
601
602 op->op_flags &= ~OPf_LIST;
603 op->op_flags |= OPf_KNOW;
604
605 switch (op->op_type) {
606 case OP_REPEAT:
4633a7c4
LW		 607 if (op->op_private & OPpREPEAT_DOLIST)
608 null(((LISTOP*)cBINOP->op_first)->op_first);
79072805 609 scalar(cBINOP->op_first);
8990e307 610 break;
79072805
LW		 611 case OP_OR:
612 case OP_AND:
613 case OP_COND_EXPR:
8990e307
LW		 614 for (kid = cUNOP->op_first->op_sibling; kid; kid = kid->op_sibling)
615 scalar(kid);
79072805 616 break;
a0d0e21e
LW		 617 case OP_SPLIT:
618 if ((kid = ((LISTOP*)op)->op_first) && kid->op_type == OP_PUSHRE) {
619 if (!kPMOP->op_pmreplroot)
620 deprecate("implicit split to @_");
621 }
622 /* FALL THROUGH */
79072805
LW		 623 case OP_MATCH:
624 case OP_SUBST:
625 case OP_NULL:
8990e307
LW		 626 default:
627 if (op->op_flags & OPf_KIDS) {
628 for (kid = cUNOP->op_first; kid; kid = kid->op_sibling)
629 scalar(kid);
630 }
79072805
LW		 631 break;
632 case OP_LEAVE:
633 case OP_LEAVETRY:
748a9306
LW		 634 scalar(cLISTOP->op_first);
635 /* FALL THROUGH */
636 case OP_SCOPE:
79072805 637 case OP_LINESEQ:
8990e307 638 case OP_LIST:
79072805
LW		 639 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling) {
640 if (kid->op_sibling)
641 scalarvoid(kid);
642 else
643 scalar(kid);
644 }
93a17b20 645 curcop = &compiling;
79072805
LW		 646 break;
647 }
79072805
LW		 648 return op;
649}
650
651OP *
652scalarvoid(op)
653OP *op;
654{
655 OP *kid;
8990e307
LW		 656 char* useless = 0;
657 SV* sv;
79072805 658
a0d0e21e 659 if (!op || error_count)
79072805
LW		 660 return op;
661 if (op->op_flags & OPf_LIST)
662 return op;
663
664 op->op_flags |= OPf_KNOW;
665
666 switch (op->op_type) {
667 default:
8990e307
LW		 668 if (!(opargs[op->op_type] & OA_FOLDCONST))
669 break;
36477c24 670 /* FALL THROUGH */
671 case OP_REPEAT:
8990e307
LW		 672 if (op->op_flags & OPf_STACKED)
673 break;
674 /* FALL THROUGH */
675 case OP_GVSV:
676 case OP_WANTARRAY:
677 case OP_GV:
678 case OP_PADSV:
679 case OP_PADAV:
680 case OP_PADHV:
681 case OP_PADANY:
682 case OP_AV2ARYLEN:
8990e307 683 case OP_REF:
a0d0e21e
LW		 684 case OP_REFGEN:
685 case OP_SREFGEN:
8990e307
LW		 686 case OP_DEFINED:
687 case OP_HEX:
688 case OP_OCT:
689 case OP_LENGTH:
690 case OP_SUBSTR:
691 case OP_VEC:
692 case OP_INDEX:
693 case OP_RINDEX:
694 case OP_SPRINTF:
695 case OP_AELEM:
696 case OP_AELEMFAST:
697 case OP_ASLICE:
8990e307
LW		 698 case OP_HELEM:
699 case OP_HSLICE:
700 case OP_UNPACK:
701 case OP_PACK:
8990e307
LW		 702 case OP_JOIN:
703 case OP_LSLICE:
704 case OP_ANONLIST:
705 case OP_ANONHASH:
706 case OP_SORT:
707 case OP_REVERSE:
708 case OP_RANGE:
709 case OP_FLIP:
710 case OP_FLOP:
711 case OP_CALLER:
712 case OP_FILENO:
713 case OP_EOF:
714 case OP_TELL:
715 case OP_GETSOCKNAME:
716 case OP_GETPEERNAME:
717 case OP_READLINK:
718 case OP_TELLDIR:
719 case OP_GETPPID:
720 case OP_GETPGRP:
721 case OP_GETPRIORITY:
722 case OP_TIME:
723 case OP_TMS:
724 case OP_LOCALTIME:
725 case OP_GMTIME:
726 case OP_GHBYNAME:
727 case OP_GHBYADDR:
728 case OP_GHOSTENT:
729 case OP_GNBYNAME:
730 case OP_GNBYADDR:
731 case OP_GNETENT:
732 case OP_GPBYNAME:
733 case OP_GPBYNUMBER:
734 case OP_GPROTOENT:
735 case OP_GSBYNAME:
736 case OP_GSBYPORT:
737 case OP_GSERVENT:
738 case OP_GPWNAM:
739 case OP_GPWUID:
740 case OP_GGRNAM:
741 case OP_GGRGID:
742 case OP_GETLOGIN:
a0d0e21e 743 if (!(op->op_private & OPpLVAL_INTRO))
c07a80fd 744 useless = op_desc[op->op_type];
8990e307
LW		 745 break;
746
747 case OP_RV2GV:
748 case OP_RV2SV:
749 case OP_RV2AV:
750 case OP_RV2HV:
a0d0e21e 751 if (!(op->op_private & OPpLVAL_INTRO) &&
85e6fe83 752 (!op->op_sibling || op->op_sibling->op_type != OP_READLINE))
8990e307
LW		 753 useless = "a variable";
754 break;
79072805 755
93a17b20 756 case OP_NEXTSTATE:
8990e307 757 case OP_DBSTATE:
748a9306 758 curcop = ((COP*)op); /* for warning below */
93a17b20
LW		 759 break;
760
79072805 761 case OP_CONST:
8990e307
LW		 762 sv = cSVOP->op_sv;
763 if (dowarn) {
764 useless = "a constant";
765 if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
766 useless = 0;
767 else if (SvPOK(sv)) {
768 if (strnEQ(SvPVX(sv), "di", 2) ||
a0d0e21e 769 strnEQ(SvPVX(sv), "ds", 2) ||
8990e307
LW		 770 strnEQ(SvPVX(sv), "ig", 2))
771 useless = 0;
772 }
773 }
774 null(op); /* don't execute a constant */
775 SvREFCNT_dec(sv); /* don't even remember it */
79072805
LW		 776 break;
777
778 case OP_POSTINC:
8990e307 779 op->op_type = OP_PREINC; /* pre-increment is faster */
79072805
LW		 780 op->op_ppaddr = ppaddr[OP_PREINC];
781 break;
782
783 case OP_POSTDEC:
8990e307 784 op->op_type = OP_PREDEC; /* pre-decrement is faster */
79072805
LW		 785 op->op_ppaddr = ppaddr[OP_PREDEC];
786 break;
787
79072805
LW		 788 case OP_OR:
789 case OP_AND:
790 case OP_COND_EXPR:
791 for (kid = cUNOP->op_first->op_sibling; kid; kid = kid->op_sibling)
792 scalarvoid(kid);
793 break;
a0d0e21e 794 case OP_NULL:
748a9306
LW		 795 if (op->op_targ == OP_NEXTSTATE || op->op_targ == OP_DBSTATE)
796 curcop = ((COP*)op); /* for warning below */
a0d0e21e
LW		 797 if (op->op_flags & OPf_STACKED)
798 break;
79072805
LW		 799 case OP_ENTERTRY:
800 case OP_ENTER:
801 case OP_SCALAR:
79072805
LW		 802 if (!(op->op_flags & OPf_KIDS))
803 break;
463ee0b2 804 case OP_SCOPE:
79072805
LW		 805 case OP_LEAVE:
806 case OP_LEAVETRY:
a0d0e21e
LW		 807 case OP_LEAVELOOP:
808 op->op_private |= OPpLEAVE_VOID;
79072805 809 case OP_LINESEQ:
79072805 810 case OP_LIST:
79072805
LW		 811 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
812 scalarvoid(kid);
813 break;
a0d0e21e
LW		 814 case OP_SPLIT:
815 if ((kid = ((LISTOP*)op)->op_first) && kid->op_type == OP_PUSHRE) {
816 if (!kPMOP->op_pmreplroot)
817 deprecate("implicit split to @_");
818 }
819 break;
aa689395 820 case OP_KEYS:
821 case OP_VALUES:
748a9306
LW		 822 case OP_DELETE:
823 op->op_private |= OPpLEAVE_VOID;
824 break;
79072805 825 }
8990e307
LW		 826 if (useless && dowarn)
827 warn("Useless use of %s in void context", useless);
79072805
LW		 828 return op;
829}
830
831OP *
832listkids(op)
833OP *op;
834{
835 OP *kid;
836 if (op && op->op_flags & OPf_KIDS) {
837 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
838 list(kid);
839 }
840 return op;
841}
842
843OP *
844list(op)
845OP *op;
846{
847 OP *kid;
848
a0d0e21e 849 /* assumes no premature commitment */
36477c24 850 if (!op || (op->op_flags & OPf_KNOW) || op->op_type == OP_RETURN
851 || error_count)
79072805
LW		 852 return op;
853
854 op->op_flags |= (OPf_KNOW | OPf_LIST);
855
856 switch (op->op_type) {
857 case OP_FLOP:
858 case OP_REPEAT:
859 list(cBINOP->op_first);
860 break;
861 case OP_OR:
862 case OP_AND:
863 case OP_COND_EXPR:
864 for (kid = cUNOP->op_first->op_sibling; kid; kid = kid->op_sibling)
865 list(kid);
866 break;
867 default:
868 case OP_MATCH:
869 case OP_SUBST:
870 case OP_NULL:
871 if (!(op->op_flags & OPf_KIDS))
872 break;
873 if (!op->op_next && cUNOP->op_first->op_type == OP_FLOP) {
874 list(cBINOP->op_first);
875 return gen_constant_list(op);
876 }
877 case OP_LIST:
878 listkids(op);
879 break;
880 case OP_LEAVE:
881 case OP_LEAVETRY:
748a9306
LW		 882 list(cLISTOP->op_first);
883 /* FALL THROUGH */
884 case OP_SCOPE:
79072805
LW		 885 case OP_LINESEQ:
886 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling) {
887 if (kid->op_sibling)
888 scalarvoid(kid);
889 else
890 list(kid);
891 }
93a17b20 892 curcop = &compiling;
79072805
LW		 893 break;
894 }
895 return op;
896}
897
898OP *
899scalarseq(op)
900OP *op;
901{
902 OP *kid;
903
463ee0b2
LW		 904 if (op) {
905 if (op->op_type == OP_LINESEQ ||
906 op->op_type == OP_SCOPE ||
79072805 907 op->op_type == OP_LEAVE ||
463ee0b2
LW		 908 op->op_type == OP_LEAVETRY)
909 {
910 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling) {
ed6116ce 911 if (kid->op_sibling) {
463ee0b2 912 scalarvoid(kid);
ed6116ce 913 }
463ee0b2
LW		 914 }
915 curcop = &compiling;
79072805 916 }
463ee0b2 917 op->op_flags &= ~OPf_PARENS;
85e6fe83 918 if (hints & HINT_BLOCK_SCOPE)
463ee0b2 919 op->op_flags |= OPf_PARENS;
79072805 920 }
8990e307
LW		 921 else
922 op = newOP(OP_STUB, 0);
79072805
LW		 923 return op;
924}
925
a0d0e21e 926static OP *
463ee0b2 927modkids(op, type)
79072805
LW		 928OP *op;
929I32 type;
930{
931 OP *kid;
932 if (op && op->op_flags & OPf_KIDS) {
933 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
463ee0b2 934 mod(kid, type);
79072805
LW		 935 }
936 return op;
937}
938
463ee0b2 939static I32 modcount;
79072805
LW		 940
941OP *
463ee0b2 942mod(op, type)
79072805
LW		 943OP *op;
944I32 type;
945{
946 OP *kid;
947 SV *sv;
948
a0d0e21e 949 if (!op || error_count)
79072805
LW		 950 return op;
951
952 switch (op->op_type) {
a0d0e21e 953 case OP_CONST:
748a9306 954 if (!(op->op_private & (OPpCONST_ARYBASE)))
a0d0e21e
LW		 955 goto nomod;
956 if (eval_start && eval_start->op_type == OP_CONST) {
957 compiling.cop_arybase = (I32)SvIV(((SVOP*)eval_start)->op_sv);
958 eval_start = 0;
959 }
960 else if (!type) {
961 SAVEI32(compiling.cop_arybase);
748a9306 962 compiling.cop_arybase = 0;
a0d0e21e
LW		 963 }
964 else if (type == OP_REFGEN)
965 goto nomod;
966 else
967 croak("That use of $[ is unsupported");
968 break;
5f05dabc 969 case OP_STUB:
970 if (op->op_flags & OPf_PARENS)
971 break;
972 goto nomod;
a0d0e21e
LW		 973 case OP_ENTERSUB:
974 if ((type == OP_UNDEF || type == OP_REFGEN) &&
975 !(op->op_flags & OPf_STACKED)) {
976 op->op_type = OP_RV2CV; /* entersub => rv2cv */
93a17b20 977 op->op_ppaddr = ppaddr[OP_RV2CV];
85e6fe83
LW		 978 assert(cUNOP->op_first->op_type == OP_NULL);
979 null(((LISTOP*)cUNOP->op_first)->op_first); /* disable pushmark */
79072805
LW		 980 break;
981 }
982 /* FALL THROUGH */
983 default:
a0d0e21e
LW		 984 nomod:
985 /* grep, foreach, subcalls, refgen */
986 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
987 break;
8990e307 988 sprintf(tokenbuf, "Can't modify %s in %s",
c07a80fd 989 op_desc[op->op_type],
990 type ? op_desc[type] : "local");
79072805
LW		 991 yyerror(tokenbuf);
992 return op;
993
a0d0e21e
LW		 994 case OP_PREINC:
995 case OP_PREDEC:
996 case OP_POW:
997 case OP_MULTIPLY:
998 case OP_DIVIDE:
999 case OP_MODULO:
1000 case OP_REPEAT:
1001 case OP_ADD:
1002 case OP_SUBTRACT:
1003 case OP_CONCAT:
1004 case OP_LEFT_SHIFT:
1005 case OP_RIGHT_SHIFT:
1006 case OP_BIT_AND:
1007 case OP_BIT_XOR:
1008 case OP_BIT_OR:
1009 case OP_I_MULTIPLY:
1010 case OP_I_DIVIDE:
1011 case OP_I_MODULO:
1012 case OP_I_ADD:
1013 case OP_I_SUBTRACT:
1014 if (!(op->op_flags & OPf_STACKED))
1015 goto nomod;
1016 modcount++;
1017 break;
1018
79072805
LW		 1019 case OP_COND_EXPR:
1020 for (kid = cUNOP->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1021 mod(kid, type);
79072805
LW		 1022 break;
1023
1024 case OP_RV2AV:
1025 case OP_RV2HV:
748a9306
LW		 1026 if (type == OP_REFGEN && op->op_flags & OPf_PARENS) {
1027 modcount = 10000;
1028 return op; /* Treat \(@foo) like ordinary list. */
1029 }
1030 /* FALL THROUGH */
79072805 1031 case OP_RV2GV:
93a17b20 1032 ref(cUNOP->op_first, op->op_type);
79072805
LW		 1033 /* FALL THROUGH */
1034 case OP_AASSIGN:
1035 case OP_ASLICE:
1036 case OP_HSLICE:
93a17b20
LW		 1037 case OP_NEXTSTATE:
1038 case OP_DBSTATE:
a0d0e21e
LW		 1039 case OP_REFGEN:
1040 case OP_CHOMP:
463ee0b2 1041 modcount = 10000;
79072805 1042 break;
463ee0b2 1043 case OP_RV2SV:
4633a7c4
LW		 1044 if (!type && cUNOP->op_first->op_type != OP_GV)
1045 croak("Can't localize a reference");
8990e307 1046 ref(cUNOP->op_first, op->op_type);
463ee0b2 1047 /* FALL THROUGH */
79072805
LW		 1048 case OP_UNDEF:
1049 case OP_GV:
463ee0b2
LW		 1050 case OP_AV2ARYLEN:
1051 case OP_SASSIGN:
8990e307
LW		 1052 case OP_AELEMFAST:
1053 modcount++;
1054 break;
1055
748a9306
LW		 1056 case OP_PADAV:
1057 case OP_PADHV:
1058 modcount = 10000;
58e0a6ae
GS		 1059 if (type == OP_REFGEN && op->op_flags & OPf_PARENS)
1060 return op; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1061 /* FALL THROUGH */
1062 case OP_PADSV:
1063 modcount++;
1064 if (!type)
1065 croak("Can't localize lexical variable %s",
1066 SvPV(*av_fetch(comppad_name, op->op_targ, 4), na));
463ee0b2
LW		 1067 break;
1068
748a9306
LW		 1069 case OP_PUSHMARK:
1070 break;
a0d0e21e 1071
69969c6f
SB		 1072 case OP_KEYS:
1073 if (type != OP_SASSIGN)
1074 goto nomod;
5f05dabc 1075 /* FALL THROUGH */
a0d0e21e 1076 case OP_POS:
463ee0b2 1077 case OP_VEC:
a0d0e21e 1078 case OP_SUBSTR:
8990e307 1079 pad_free(op->op_targ);
ed6116ce 1080 op->op_targ = pad_alloc(op->op_type, SVs_PADMY);
5f05dabc 1081 assert(SvTYPE(PAD_SV(op->op_targ)) == SVt_NULL);
8990e307 1082 if (op->op_flags & OPf_KIDS)
4633a7c4 1083 mod(cBINOP->op_first->op_sibling, type);
463ee0b2 1084 break;
a0d0e21e 1085
463ee0b2
LW		 1086 case OP_AELEM:
1087 case OP_HELEM:
8990e307 1088 ref(cBINOP->op_first, op->op_type);
a0d0e21e 1089 modcount++;
463ee0b2
LW		 1090 break;
1091
1092 case OP_SCOPE:
1093 case OP_LEAVE:
1094 case OP_ENTER:
a0d0e21e
LW		 1095 if (op->op_flags & OPf_KIDS)
1096 mod(cLISTOP->op_last, type);
1097 break;
1098
1099 case OP_NULL:
463ee0b2
LW		 1100 if (!(op->op_flags & OPf_KIDS))
1101 break;
a0d0e21e
LW		 1102 if (op->op_targ != OP_LIST) {
1103 mod(cBINOP->op_first, type);
1104 break;
1105 }
1106 /* FALL THROUGH */
463ee0b2
LW		 1107 case OP_LIST:
1108 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
1109 mod(kid, type);
1110 break;
1111 }
a0d0e21e
LW		 1112 op->op_flags |= OPf_MOD;
1113
1114 if (type == OP_AASSIGN || type == OP_SASSIGN)
1115 op->op_flags |= OPf_SPECIAL|OPf_REF;
1116 else if (!type) {
1117 op->op_private |= OPpLVAL_INTRO;
463ee0b2 1118 op->op_flags &= ~OPf_SPECIAL;
463ee0b2 1119 }
a0d0e21e
LW		 1120 else if (type != OP_GREPSTART && type != OP_ENTERSUB)
1121 op->op_flags |= OPf_REF;
463ee0b2
LW		 1122 return op;
1123}
1124
1125OP *
1126refkids(op, type)
1127OP *op;
1128I32 type;
1129{
1130 OP *kid;
1131 if (op && op->op_flags & OPf_KIDS) {
1132 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
1133 ref(kid, type);
1134 }
1135 return op;
1136}
1137
1138OP *
1139ref(op, type)
1140OP *op;
1141I32 type;
1142{
1143 OP *kid;
463ee0b2 1144
a0d0e21e 1145 if (!op || error_count)
463ee0b2
LW		 1146 return op;
1147
1148 switch (op->op_type) {
a0d0e21e
LW		 1149 case OP_ENTERSUB:
1150 if ((type == OP_DEFINED) &&
1151 !(op->op_flags & OPf_STACKED)) {
1152 op->op_type = OP_RV2CV; /* entersub => rv2cv */
8990e307 1153 op->op_ppaddr = ppaddr[OP_RV2CV];
85e6fe83
LW		 1154 assert(cUNOP->op_first->op_type == OP_NULL);
1155 null(((LISTOP*)cUNOP->op_first)->op_first); /* disable pushmark */
4633a7c4 1156 op->op_flags |= OPf_SPECIAL;
8990e307
LW		 1157 }
1158 break;
1159
463ee0b2
LW		 1160 case OP_COND_EXPR:
1161 for (kid = cUNOP->op_first->op_sibling; kid; kid = kid->op_sibling)
1162 ref(kid, type);
1163 break;
8990e307 1164 case OP_RV2SV:
8990e307 1165 ref(cUNOP->op_first, op->op_type);
4633a7c4
LW		 1166 /* FALL THROUGH */
1167 case OP_PADSV:
5f05dabc 1168 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
1169 op->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1170 : type == OP_RV2HV ? OPpDEREF_HV
1171 : OPpDEREF_SV);
a0d0e21e
LW		 1172 op->op_flags |= OPf_MOD;
1173 }
8990e307
LW		 1174 break;
1175
463ee0b2
LW		 1176 case OP_RV2AV:
1177 case OP_RV2HV:
a0d0e21e 1178 op->op_flags |= OPf_REF;
8990e307 1179 /* FALL THROUGH */
463ee0b2
LW		 1180 case OP_RV2GV:
1181 ref(cUNOP->op_first, op->op_type);
463ee0b2 1182 break;
8990e307 1183
463ee0b2
LW		 1184 case OP_PADAV:
1185 case OP_PADHV:
a0d0e21e 1186 op->op_flags |= OPf_REF;
79072805 1187 break;
8990e307
LW		 1188
1189 case OP_SCALAR:
79072805
LW		 1190 case OP_NULL:
1191 if (!(op->op_flags & OPf_KIDS))
463ee0b2 1192 break;
8990e307 1193 ref(cBINOP->op_first, type);
79072805
LW		 1194 break;
1195 case OP_AELEM:
1196 case OP_HELEM:
8990e307 1197 ref(cBINOP->op_first, op->op_type);
5f05dabc 1198 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
1199 op->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1200 : type == OP_RV2HV ? OPpDEREF_HV
1201 : OPpDEREF_SV);
a0d0e21e 1202 op->op_flags |= OPf_MOD;
8990e307 1203 }
79072805
LW		 1204 break;
1205
463ee0b2 1206 case OP_SCOPE:
79072805
LW		 1207 case OP_LEAVE:
1208 case OP_ENTER:
8990e307 1209 case OP_LIST:
79072805
LW		 1210 if (!(op->op_flags & OPf_KIDS))
1211 break;
8990e307 1212 ref(cLISTOP->op_last, type);
79072805 1213 break;
a0d0e21e
LW		 1214 default:
1215 break;
79072805 1216 }
8990e307
LW		 1217 return scalar(op);
1218
79072805
LW		 1219}
1220
1221OP *
93a17b20
LW		 1222my(op)
1223OP *op;
1224{
1225 OP *kid;
93a17b20
LW		 1226 I32 type;
1227
a0d0e21e 1228 if (!op || error_count)
93a17b20
LW		 1229 return op;
1230
1231 type = op->op_type;
1232 if (type == OP_LIST) {
1233 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
1234 my(kid);
1235 }
1236 else if (type != OP_PADSV &&
1237 type != OP_PADAV &&
1238 type != OP_PADHV &&
1239 type != OP_PUSHMARK)
1240 {
c07a80fd 1241 sprintf(tokenbuf, "Can't declare %s in my", op_desc[op->op_type]);
93a17b20
LW		 1242 yyerror(tokenbuf);
1243 return op;
1244 }
a0d0e21e
LW		 1245 op->op_flags |= OPf_MOD;
1246 op->op_private |= OPpLVAL_INTRO;
93a17b20
LW		 1247 return op;
1248}
1249
1250OP *
79072805
LW		 1251sawparens(o)
1252OP *o;
1253{
1254 if (o)
1255 o->op_flags |= OPf_PARENS;
1256 return o;
1257}
1258
1259OP *
1260bind_match(type, left, right)
1261I32 type;
1262OP *left;
1263OP *right;
1264{
1265 OP *op;
1266
1267 if (right->op_type == OP_MATCH ||
1268 right->op_type == OP_SUBST ||
1269 right->op_type == OP_TRANS) {
1270 right->op_flags |= OPf_STACKED;
1271 if (right->op_type != OP_MATCH)
463ee0b2 1272 left = mod(left, right->op_type);
79072805 1273 if (right->op_type == OP_TRANS)
a0d0e21e 1274 op = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805
LW		 1275 else
1276 op = prepend_elem(right->op_type, scalar(left), right);
1277 if (type == OP_NOT)
1278 return newUNOP(OP_NOT, 0, scalar(op));
1279 return op;
1280 }
1281 else
1282 return bind_match(type, left,
1283 pmruntime(newPMOP(OP_MATCH, 0), right, Nullop));
1284}
1285
1286OP *
1287invert(op)
1288OP *op;
1289{
1290 if (!op)
1291 return op;
1292 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
1293 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(op));
1294}
1295
1296OP *
1297scope(o)
1298OP *o;
1299{
1300 if (o) {
4633a7c4 1301 if (o->op_flags & OPf_PARENS || perldb || tainting) {
463ee0b2
LW		 1302 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1303 o->op_type = OP_LEAVE;
1304 o->op_ppaddr = ppaddr[OP_LEAVE];
1305 }
1306 else {
1307 if (o->op_type == OP_LINESEQ) {
1308 OP *kid;
1309 o->op_type = OP_SCOPE;
1310 o->op_ppaddr = ppaddr[OP_SCOPE];
1311 kid = ((LISTOP*)o)->op_first;
748a9306
LW		 1312 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE){
1313 SvREFCNT_dec(((COP*)kid)->cop_filegv);
8990e307 1314 null(kid);
748a9306 1315 }
463ee0b2
LW		 1316 }
1317 else
748a9306 1318 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
463ee0b2 1319 }
79072805
LW		 1320 }
1321 return o;
1322}
1323
a0d0e21e 1324int
55497cff 1325block_start(full)
1326int full;
79072805 1327{
a0d0e21e 1328 int retval = savestack_ix;
55497cff 1329 SAVEI32(comppad_name_floor);
1330 if (full) {
1331 if ((comppad_name_fill = AvFILL(comppad_name)) > 0)
1332 comppad_name_floor = comppad_name_fill;
1333 else
1334 comppad_name_floor = 0;
1335 }
1336 SAVEI32(min_intro_pending);
1337 SAVEI32(max_intro_pending);
a0d0e21e 1338 min_intro_pending = 0;
55497cff 1339 SAVEI32(comppad_name_fill);
1340 SAVEI32(padix_floor);
a0d0e21e
LW		 1341 padix_floor = padix;
1342 pad_reset_pending = FALSE;
55497cff 1343 SAVEI32(hints);
a0d0e21e
LW		 1344 hints &= ~HINT_BLOCK_SCOPE;
1345 return retval;
1346}
1347
1348OP*
36477c24 1349block_end(floor, seq)
1350I32 floor;
a0d0e21e
LW		 1351OP* seq;
1352{
1353 int needblockscope = hints & HINT_BLOCK_SCOPE;
1354 OP* retval = scalarseq(seq);
a0d0e21e
LW		 1355 LEAVE_SCOPE(floor);
1356 pad_reset_pending = FALSE;
1357 if (needblockscope)
1358 hints |= HINT_BLOCK_SCOPE; /* propagate out */
1359 pad_leavemy(comppad_name_fill);
bbce6d69 1360 cop_seqmax++;
a0d0e21e
LW		 1361 return retval;
1362}
1363
1364void
1365newPROG(op)
1366OP *op;
1367{
1368 if (in_eval) {
b1cb66bf 1369 eval_root = newUNOP(OP_LEAVEEVAL, ((in_eval & 4) ? OPf_SPECIAL : 0), op);
a0d0e21e
LW		 1370 eval_start = linklist(eval_root);
1371 eval_root->op_next = 0;
1372 peep(eval_start);
1373 }
1374 else {
4fdae800 1375 if (!op)
a0d0e21e 1376 return;
a0d0e21e
LW		 1377 main_root = scope(sawparens(scalarvoid(op)));
1378 curcop = &compiling;
1379 main_start = LINKLIST(main_root);
1380 main_root->op_next = 0;
1381 peep(main_start);
748a9306 1382 compcv = 0;
3841441e 1383
4fdae800 1384 /* Register with debugger */
3841441e
CS		 1385 if (perldb) {
1386 CV *cv = perl_get_cv("DB::postponed", FALSE);
3841441e
CS		 1387 if (cv) {
1388 dSP;
1389 PUSHMARK(sp);
1390 XPUSHs((SV*)compiling.cop_filegv);
1391 PUTBACK;
1392 perl_call_sv((SV*)cv, G_DISCARD);
1393 }
1394 }
79072805 1395 }
79072805
LW		 1396}
1397
1398OP *
93a17b20 1399localize(o, lex)
79072805 1400OP *o;
93a17b20 1401I32 lex;
79072805
LW		 1402{
1403 if (o->op_flags & OPf_PARENS)
1404 list(o);
8990e307 1405 else {
79072805 1406 scalar(o);
8990e307
LW		 1407 if (dowarn && bufptr > oldbufptr && bufptr[-1] == ',') {
1408 char *s;
1409 for (s = bufptr; *s && (isALNUM(*s) || strchr("@$%, ",*s)); s++) ;
a0d0e21e 1410 if (*s == ';' || *s == '=')
8990e307
LW		 1411 warn("Parens missing around \"%s\" list", lex ? "my" : "local");
1412 }
1413 }
93a17b20
LW		 1414 in_my = FALSE;
1415 if (lex)
1416 return my(o);
1417 else
463ee0b2 1418 return mod(o, OP_NULL); /* a bit kludgey */
79072805
LW		 1419}
1420
1421OP *
1422jmaybe(o)
1423OP *o;
1424{
1425 if (o->op_type == OP_LIST) {
1426 o = convert(OP_JOIN, 0,
1427 prepend_elem(OP_LIST,
85e6fe83 1428 newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
79072805
LW		 1429 o));
1430 }
1431 return o;
1432}
1433
1434OP *
1435fold_constants(o)
1436register OP *o;
1437{
1438 register OP *curop;
1439 I32 type = o->op_type;
748a9306 1440 SV *sv;
79072805
LW		 1441
1442 if (opargs[type] & OA_RETSCALAR)
1443 scalar(o);
1444 if (opargs[type] & OA_TARGET)
ed6116ce 1445 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 1446
85e6fe83 1447 if ((opargs[type] & OA_OTHERINT) && (hints & HINT_INTEGER))
a0d0e21e 1448 o->op_ppaddr = ppaddr[type = ++(o->op_type)];
85e6fe83 1449
79072805
LW		 1450 if (!(opargs[type] & OA_FOLDCONST))
1451 goto nope;
1452
a0d0e21e
LW		 1453 if (error_count)
1454 goto nope; /* Don't try to run w/ errors */
1455
79072805 1456 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
93a17b20
LW		 1457 if (curop->op_type != OP_CONST &&
1458 curop->op_type != OP_LIST &&
1459 curop->op_type != OP_SCALAR &&
a0d0e21e 1460 curop->op_type != OP_NULL &&
93a17b20 1461 curop->op_type != OP_PUSHMARK) {
79072805
LW		 1462 goto nope;
1463 }
1464 }
1465
1466 curop = LINKLIST(o);
1467 o->op_next = 0;
1468 op = curop;
8da795c6 1469 runops();
748a9306
LW		 1470 sv = *(stack_sp--);
1471 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
79072805 1472 pad_swipe(o->op_targ);
748a9306
LW		 1473 else if (SvTEMP(sv)) { /* grab mortal temp? */
1474 (void)SvREFCNT_inc(sv);
1475 SvTEMP_off(sv);
85e6fe83 1476 }
79072805
LW		 1477 op_free(o);
1478 if (type == OP_RV2GV)
b1cb66bf 1479 return newGVOP(OP_GV, 0, (GV*)sv);
748a9306
LW		 1480 else {
1481 if ((SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK)) == SVf_NOK) {
1482 IV iv = SvIV(sv);
1483 if ((double)iv == SvNV(sv)) { /* can we smush double to int */
1484 SvREFCNT_dec(sv);
1485 sv = newSViv(iv);
1486 }
b1cb66bf 1487 else
1488 SvIOK_off(sv); /* undo SvIV() damage */
748a9306
LW		 1489 }
1490 return newSVOP(OP_CONST, 0, sv);
1491 }
79072805
LW		 1492
1493 nope:
1494 if (!(opargs[type] & OA_OTHERINT))
1495 return o;
79072805 1496
85e6fe83 1497 if (!(hints & HINT_INTEGER)) {
a0d0e21e 1498 if (type == OP_DIVIDE || !(o->op_flags & OPf_KIDS))
85e6fe83
LW		 1499 return o;
1500
1501 for (curop = ((UNOP*)o)->op_first; curop; curop = curop->op_sibling) {
1502 if (curop->op_type == OP_CONST) {
b1cb66bf 1503 if (SvIOK(((SVOP*)curop)->op_sv))
85e6fe83
LW		 1504 continue;
1505 return o;
1506 }
1507 if (opargs[curop->op_type] & OA_RETINTEGER)
79072805
LW		 1508 continue;
1509 return o;
1510 }
a0d0e21e 1511 o->op_ppaddr = ppaddr[++(o->op_type)];
79072805
LW		 1512 }
1513
79072805
LW		 1514 return o;
1515}
1516
1517OP *
1518gen_constant_list(o)
1519register OP *o;
1520{
1521 register OP *curop;
79072805 1522 I32 oldtmps_floor = tmps_floor;
79072805 1523
a0d0e21e
LW		 1524 list(o);
1525 if (error_count)
1526 return o; /* Don't attempt to run with errors */
1527
1528 op = curop = LINKLIST(o);
1529 o->op_next = 0;
1530 pp_pushmark();
8da795c6 1531 runops();
a0d0e21e
LW		 1532 op = curop;
1533 pp_anonlist();
79072805 1534 tmps_floor = oldtmps_floor;
79072805
LW		 1535
1536 o->op_type = OP_RV2AV;
1537 o->op_ppaddr = ppaddr[OP_RV2AV];
79072805 1538 curop = ((UNOP*)o)->op_first;
a0d0e21e 1539 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*stack_sp--));
79072805 1540 op_free(curop);
79072805
LW		 1541 linklist(o);
1542 return list(o);
1543}
1544
1545OP *
1546convert(type, flags, op)
1547I32 type;
1548I32 flags;
1549OP* op;
1550{
1551 OP *kid;
a0d0e21e 1552 OP *last = 0;
79072805 1553
79072805
LW		 1554 if (!op || op->op_type != OP_LIST)
1555 op = newLISTOP(OP_LIST, 0, op, Nullop);
748a9306
LW		 1556 else
1557 op->op_flags &= ~(OPf_KNOW|OPf_LIST);
79072805 1558
8990e307
LW		 1559 if (!(opargs[type] & OA_MARK))
1560 null(cLISTOP->op_first);
1561
79072805
LW		 1562 op->op_type = type;
1563 op->op_ppaddr = ppaddr[type];
1564 op->op_flags |= flags;
1565
e50aee73 1566 op = CHECKOP(type, op);
79072805
LW		 1567 if (op->op_type != type)
1568 return op;
1569
1570 if (cLISTOP->op_children < 7) {
1571 /* XXX do we really need to do this if we're done appending?? */
1572 for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
1573 last = kid;
1574 cLISTOP->op_last = last; /* in case check substituted last arg */
1575 }
1576
1577 return fold_constants(op);
1578}
1579
1580/* List constructors */
1581
1582OP *
1583append_elem(type, first, last)
1584I32 type;
1585OP* first;
1586OP* last;
1587{
1588 if (!first)
1589 return last;
8990e307
LW		 1590
1591 if (!last)
79072805 1592 return first;
8990e307 1593
a0d0e21e
LW		 1594 if (first->op_type != type || type==OP_LIST && first->op_flags & OPf_PARENS)
1595 return newLISTOP(type, 0, first, last);
79072805 1596
a0d0e21e
LW		 1597 if (first->op_flags & OPf_KIDS)
1598 ((LISTOP*)first)->op_last->op_sibling = last;
1599 else {
1600 first->op_flags |= OPf_KIDS;
1601 ((LISTOP*)first)->op_first = last;
1602 }
1603 ((LISTOP*)first)->op_last = last;
1604 ((LISTOP*)first)->op_children++;
1605 return first;
79072805
LW		 1606}
1607
1608OP *
1609append_list(type, first, last)
1610I32 type;
1611LISTOP* first;
1612LISTOP* last;
1613{
1614 if (!first)
1615 return (OP*)last;
8990e307
LW		 1616
1617 if (!last)
79072805 1618 return (OP*)first;
8990e307
LW		 1619
1620 if (first->op_type != type)
79072805 1621 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307
LW		 1622
1623 if (last->op_type != type)
79072805
LW		 1624 return append_elem(type, (OP*)first, (OP*)last);
1625
1626 first->op_last->op_sibling = last->op_first;
1627 first->op_last = last->op_last;
1628 first->op_children += last->op_children;
1629 if (first->op_children)
1630 last->op_flags |= OPf_KIDS;
1631
1632 Safefree(last);
1633 return (OP*)first;
1634}
1635
1636OP *
1637prepend_elem(type, first, last)
1638I32 type;
1639OP* first;
1640OP* last;
1641{
1642 if (!first)
1643 return last;
8990e307
LW		 1644
1645 if (!last)
79072805 1646 return first;
8990e307
LW		 1647
1648 if (last->op_type == type) {
1649 if (type == OP_LIST) { /* already a PUSHMARK there */
1650 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
1651 ((LISTOP*)last)->op_first->op_sibling = first;
1652 }
1653 else {
1654 if (!(last->op_flags & OPf_KIDS)) {
1655 ((LISTOP*)last)->op_last = first;
1656 last->op_flags |= OPf_KIDS;
1657 }
1658 first->op_sibling = ((LISTOP*)last)->op_first;
1659 ((LISTOP*)last)->op_first = first;
79072805 1660 }
79072805
LW		 1661 ((LISTOP*)last)->op_children++;
1662 return last;
1663 }
1664
1665 return newLISTOP(type, 0, first, last);
1666}
1667
1668/* Constructors */
1669
1670OP *
1671newNULLLIST()
1672{
8990e307
LW		 1673 return newOP(OP_STUB, 0);
1674}
1675
1676OP *
1677force_list(op)
1678OP* op;
1679{
1680 if (!op || op->op_type != OP_LIST)
1681 op = newLISTOP(OP_LIST, 0, op, Nullop);
1682 null(op);
1683 return op;
79072805
LW		 1684}
1685
1686OP *
1687newLISTOP(type, flags, first, last)
1688I32 type;
1689I32 flags;
1690OP* first;
1691OP* last;
1692{
1693 LISTOP *listop;
1694
1695 Newz(1101, listop, 1, LISTOP);
1696
1697 listop->op_type = type;
1698 listop->op_ppaddr = ppaddr[type];
1699 listop->op_children = (first != 0) + (last != 0);
1700 listop->op_flags = flags;
79072805
LW		 1701
1702 if (!last && first)
1703 last = first;
1704 else if (!first && last)
1705 first = last;
8990e307
LW		 1706 else if (first)
1707 first->op_sibling = last;
79072805
LW		 1708 listop->op_first = first;
1709 listop->op_last = last;
8990e307
LW		 1710 if (type == OP_LIST) {
1711 OP* pushop;
1712 pushop = newOP(OP_PUSHMARK, 0);
1713 pushop->op_sibling = first;
1714 listop->op_first = pushop;
1715 listop->op_flags |= OPf_KIDS;
1716 if (!last)
1717 listop->op_last = pushop;
1718 }
1719 else if (listop->op_children)
1720 listop->op_flags |= OPf_KIDS;
79072805
LW		 1721
1722 return (OP*)listop;
1723}
1724
1725OP *
1726newOP(type, flags)
1727I32 type;
1728I32 flags;
1729{
1730 OP *op;
1731 Newz(1101, op, 1, OP);
1732 op->op_type = type;
1733 op->op_ppaddr = ppaddr[type];
1734 op->op_flags = flags;
1735
1736 op->op_next = op;
c07a80fd 1737 op->op_private = 0 + (flags >> 8);
79072805
LW		 1738 if (opargs[type] & OA_RETSCALAR)
1739 scalar(op);
1740 if (opargs[type] & OA_TARGET)
ed6116ce 1741 op->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 1742 return CHECKOP(type, op);
79072805
LW		 1743}
1744
1745OP *
1746newUNOP(type, flags, first)
1747I32 type;
1748I32 flags;
1749OP* first;
1750{
1751 UNOP *unop;
1752
93a17b20
LW		 1753 if (!first)
1754 first = newOP(OP_STUB, 0);
8990e307
LW		 1755 if (opargs[type] & OA_MARK)
1756 first = force_list(first);
93a17b20 1757
79072805
LW		 1758 Newz(1101, unop, 1, UNOP);
1759 unop->op_type = type;
1760 unop->op_ppaddr = ppaddr[type];
1761 unop->op_first = first;
1762 unop->op_flags = flags | OPf_KIDS;
c07a80fd 1763 unop->op_private = 1 | (flags >> 8);
79072805 1764
e50aee73 1765 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 1766 if (unop->op_next)
1767 return (OP*)unop;
1768
a0d0e21e 1769 return fold_constants((OP *) unop);
79072805
LW		 1770}
1771
1772OP *
1773newBINOP(type, flags, first, last)
1774I32 type;
1775I32 flags;
1776OP* first;
1777OP* last;
1778{
1779 BINOP *binop;
1780 Newz(1101, binop, 1, BINOP);
1781
1782 if (!first)
1783 first = newOP(OP_NULL, 0);
1784
1785 binop->op_type = type;
1786 binop->op_ppaddr = ppaddr[type];
1787 binop->op_first = first;
1788 binop->op_flags = flags | OPf_KIDS;
1789 if (!last) {
1790 last = first;
c07a80fd 1791 binop->op_private = 1 | (flags >> 8);
79072805
LW		 1792 }
1793 else {
c07a80fd 1794 binop->op_private = 2 | (flags >> 8);
79072805
LW		 1795 first->op_sibling = last;
1796 }
1797
e50aee73 1798 binop = (BINOP*)CHECKOP(type, binop);
79072805
LW		 1799 if (binop->op_next)
1800 return (OP*)binop;
1801
1802 binop->op_last = last = binop->op_first->op_sibling;
1803
a0d0e21e 1804 return fold_constants((OP *)binop);
79072805
LW		 1805}
1806
1807OP *
1808pmtrans(op, expr, repl)
1809OP *op;
1810OP *expr;
1811OP *repl;
1812{
79072805
LW		 1813 SV *tstr = ((SVOP*)expr)->op_sv;
1814 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 1815 STRLEN tlen;
1816 STRLEN rlen;
ec49126f 1817 register U8 *t = (U8*)SvPV(tstr, tlen);
1818 register U8 *r = (U8*)SvPV(rstr, rlen);
79072805
LW		 1819 register I32 i;
1820 register I32 j;
79072805
LW		 1821 I32 delete;
1822 I32 complement;
1823 register short *tbl;
1824
1825 tbl = (short*)cPVOP->op_pv;
1826 complement = op->op_private & OPpTRANS_COMPLEMENT;
1827 delete = op->op_private & OPpTRANS_DELETE;
748a9306 1828 /* squash = op->op_private & OPpTRANS_SQUASH; */
79072805
LW		 1829
1830 if (complement) {
1831 Zero(tbl, 256, short);
1832 for (i = 0; i < tlen; i++)
ec49126f 1833 tbl[t[i]] = -1;
79072805
LW		 1834 for (i = 0, j = 0; i < 256; i++) {
1835 if (!tbl[i]) {
1836 if (j >= rlen) {
1837 if (delete)
1838 tbl[i] = -2;
1839 else if (rlen)
ec49126f 1840 tbl[i] = r[j-1];
79072805
LW		 1841 else
1842 tbl[i] = i;
1843 }
1844 else
ec49126f 1845 tbl[i] = r[j++];
79072805
LW		 1846 }
1847 }
1848 }
1849 else {
1850 if (!rlen && !delete) {
1851 r = t; rlen = tlen;
1852 }
1853 for (i = 0; i < 256; i++)
1854 tbl[i] = -1;
1855 for (i = 0, j = 0; i < tlen; i++,j++) {
1856 if (j >= rlen) {
1857 if (delete) {
ec49126f 1858 if (tbl[t[i]] == -1)
1859 tbl[t[i]] = -2;
79072805
LW		 1860 continue;
1861 }
1862 --j;
1863 }
ec49126f 1864 if (tbl[t[i]] == -1)
1865 tbl[t[i]] = r[j];
79072805
LW		 1866 }
1867 }
1868 op_free(expr);
1869 op_free(repl);
1870
1871 return op;
1872}
1873
1874OP *
1875newPMOP(type, flags)
1876I32 type;
1877I32 flags;
1878{
1879 PMOP *pmop;
1880
1881 Newz(1101, pmop, 1, PMOP);
1882 pmop->op_type = type;
1883 pmop->op_ppaddr = ppaddr[type];
1884 pmop->op_flags = flags;
c07a80fd 1885 pmop->op_private = 0 | (flags >> 8);
79072805 1886
36477c24 1887 if (hints & HINT_LOCALE)
1888 pmop->op_pmpermflags = (pmop->op_pmflags |= PMf_LOCALE);
1889
79072805 1890 /* link into pm list */
a0d0e21e 1891 if (type != OP_TRANS && curstash) {
79072805
LW		 1892 pmop->op_pmnext = HvPMROOT(curstash);
1893 HvPMROOT(curstash) = pmop;
1894 }
1895
1896 return (OP*)pmop;
1897}
1898
1899OP *
1900pmruntime(op, expr, repl)
1901OP *op;
1902OP *expr;
1903OP *repl;
1904{
1905 PMOP *pm;
1906 LOGOP *rcop;
1907
1908 if (op->op_type == OP_TRANS)
1909 return pmtrans(op, expr, repl);
1910
1911 pm = (PMOP*)op;
1912
1913 if (expr->op_type == OP_CONST) {
463ee0b2 1914 STRLEN plen;
79072805 1915 SV *pat = ((SVOP*)expr)->op_sv;
463ee0b2 1916 char *p = SvPV(pat, plen);
79072805 1917 if ((op->op_flags & OPf_SPECIAL) && strEQ(p, " ")) {
93a17b20 1918 sv_setpvn(pat, "\\s+", 3);
463ee0b2 1919 p = SvPV(pat, plen);
79072805
LW		 1920 pm->op_pmflags |= PMf_SKIPWHITE;
1921 }
e50aee73 1922 pm->op_pmregexp = pregcomp(p, p + plen, pm);
85e6fe83
LW		 1923 if (strEQ("\\s+", pm->op_pmregexp->precomp))
1924 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 1925 hoistmust(pm);
1926 op_free(expr);
1927 }
1928 else {
463ee0b2
LW		 1929 if (pm->op_pmflags & PMf_KEEP)
1930 expr = newUNOP(OP_REGCMAYBE,0,expr);
1931
79072805
LW		 1932 Newz(1101, rcop, 1, LOGOP);
1933 rcop->op_type = OP_REGCOMP;
1934 rcop->op_ppaddr = ppaddr[OP_REGCOMP];
1935 rcop->op_first = scalar(expr);
1936 rcop->op_flags |= OPf_KIDS;
1937 rcop->op_private = 1;
1938 rcop->op_other = op;
1939
1940 /* establish postfix order */
463ee0b2
LW		 1941 if (pm->op_pmflags & PMf_KEEP) {
1942 LINKLIST(expr);
1943 rcop->op_next = expr;
1944 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
1945 }
1946 else {
1947 rcop->op_next = LINKLIST(expr);
1948 expr->op_next = (OP*)rcop;
1949 }
79072805 1950
463ee0b2 1951 prepend_elem(op->op_type, scalar((OP*)rcop), op);
79072805
LW		 1952 }
1953
1954 if (repl) {
748a9306
LW		 1955 OP *curop;
1956 if (pm->op_pmflags & PMf_EVAL)
1957 curop = 0;
1958 else if (repl->op_type == OP_CONST)
1959 curop = repl;
79072805 1960 else {
79072805
LW		 1961 OP *lastop = 0;
1962 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
1963 if (opargs[curop->op_type] & OA_DANGEROUS) {
1964 if (curop->op_type == OP_GV) {
1965 GV *gv = ((GVOP*)curop)->op_gv;
93a17b20 1966 if (strchr("&`'123456789+", *GvENAME(gv)))
79072805
LW		 1967 break;
1968 }
1969 else if (curop->op_type == OP_RV2CV)
1970 break;
1971 else if (curop->op_type == OP_RV2SV ||
1972 curop->op_type == OP_RV2AV ||
1973 curop->op_type == OP_RV2HV ||
1974 curop->op_type == OP_RV2GV) {
1975 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
1976 break;
1977 }
748a9306
LW		 1978 else if (curop->op_type == OP_PADSV ||
1979 curop->op_type == OP_PADAV ||
1980 curop->op_type == OP_PADHV ||
1981 curop->op_type == OP_PADANY) {
1982 /* is okay */
1983 }
79072805
LW		 1984 else
1985 break;
1986 }
1987 lastop = curop;
1988 }
748a9306
LW		 1989 }
1990 if (curop == repl) {
1991 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 1992 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
748a9306
LW		 1993 prepend_elem(op->op_type, scalar(repl), op);
1994 }
1995 else {
1996 Newz(1101, rcop, 1, LOGOP);
1997 rcop->op_type = OP_SUBSTCONT;
1998 rcop->op_ppaddr = ppaddr[OP_SUBSTCONT];
1999 rcop->op_first = scalar(repl);
2000 rcop->op_flags |= OPf_KIDS;
2001 rcop->op_private = 1;
2002 rcop->op_other = op;
2003
2004 /* establish postfix order */
2005 rcop->op_next = LINKLIST(repl);
2006 repl->op_next = (OP*)rcop;
2007
2008 pm->op_pmreplroot = scalar((OP*)rcop);
2009 pm->op_pmreplstart = LINKLIST(rcop);
2010 rcop->op_next = 0;
79072805
LW		 2011 }
2012 }
2013
2014 return (OP*)pm;
2015}
2016
2017OP *
2018newSVOP(type, flags, sv)
2019I32 type;
2020I32 flags;
2021SV *sv;
2022{
2023 SVOP *svop;
2024 Newz(1101, svop, 1, SVOP);
2025 svop->op_type = type;
2026 svop->op_ppaddr = ppaddr[type];
2027 svop->op_sv = sv;
2028 svop->op_next = (OP*)svop;
2029 svop->op_flags = flags;
2030 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2031 scalar((OP*)svop);
79072805 2032 if (opargs[type] & OA_TARGET)
ed6116ce 2033 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2034 return CHECKOP(type, svop);
79072805
LW		 2035}
2036
2037OP *
2038newGVOP(type, flags, gv)
2039I32 type;
2040I32 flags;
2041GV *gv;
2042{
2043 GVOP *gvop;
2044 Newz(1101, gvop, 1, GVOP);
2045 gvop->op_type = type;
2046 gvop->op_ppaddr = ppaddr[type];
8990e307 2047 gvop->op_gv = (GV*)SvREFCNT_inc(gv);
79072805
LW		 2048 gvop->op_next = (OP*)gvop;
2049 gvop->op_flags = flags;
2050 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2051 scalar((OP*)gvop);
79072805 2052 if (opargs[type] & OA_TARGET)
ed6116ce 2053 gvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2054 return CHECKOP(type, gvop);
79072805
LW		 2055}
2056
2057OP *
2058newPVOP(type, flags, pv)
2059I32 type;
2060I32 flags;
2061char *pv;
2062{
2063 PVOP *pvop;
2064 Newz(1101, pvop, 1, PVOP);
2065 pvop->op_type = type;
2066 pvop->op_ppaddr = ppaddr[type];
2067 pvop->op_pv = pv;
2068 pvop->op_next = (OP*)pvop;
2069 pvop->op_flags = flags;
2070 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2071 scalar((OP*)pvop);
79072805 2072 if (opargs[type] & OA_TARGET)
ed6116ce 2073 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2074 return CHECKOP(type, pvop);
79072805
LW		 2075}
2076
79072805
LW		 2077void
2078package(op)
2079OP *op;
2080{
93a17b20 2081 SV *sv;
79072805
LW		 2082
2083 save_hptr(&curstash);
2084 save_item(curstname);
93a17b20 2085 if (op) {
463ee0b2
LW		 2086 STRLEN len;
2087 char *name;
93a17b20 2088 sv = cSVOP->op_sv;
463ee0b2 2089 name = SvPV(sv, len);
b1cb66bf 2090 curstash = gv_stashpvn(name,len,TRUE);
463ee0b2 2091 sv_setpvn(curstname, name, len);
93a17b20
LW		 2092 op_free(op);
2093 }
2094 else {
2095 sv_setpv(curstname,"<none>");
2096 curstash = Nullhv;
2097 }
79072805 2098 copline = NOLINE;
8990e307 2099 expect = XSTATE;
79072805
LW		 2100}
2101
85e6fe83 2102void
b1cb66bf 2103utilize(aver, floor, version, id, arg)
85e6fe83 2104int aver;
c07a80fd 2105I32 floor;
b1cb66bf 2106OP *version;
85e6fe83
LW		 2107OP *id;
2108OP *arg;
2109{
a0d0e21e
LW		 2110 OP *pack;
2111 OP *meth;
2112 OP *rqop;
2113 OP *imop;
b1cb66bf 2114 OP *veop;
85e6fe83 2115
a0d0e21e
LW		 2116 if (id->op_type != OP_CONST)
2117 croak("Module name must be constant");
85e6fe83 2118
b1cb66bf 2119 veop = Nullop;
2120
2121 if(version != Nullop) {
2122 SV *vesv = ((SVOP*)version)->op_sv;
2123
2124 if (arg == Nullop && !SvNIOK(vesv)) {
2125 arg = version;
2126 }
2127 else {
2128 OP *pack;
2129 OP *meth;
2130
2131 if (version->op_type != OP_CONST || !SvNIOK(vesv))
2132 croak("Version number must be constant number");
2133
2134 /* Make copy of id so we don't free it twice */
2135 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
2136
2137 /* Fake up a method call to VERSION */
2138 meth = newSVOP(OP_CONST, 0, newSVpv("VERSION", 7));
2139 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
2140 append_elem(OP_LIST,
2141 prepend_elem(OP_LIST, pack, list(version)),
2142 newUNOP(OP_METHOD, 0, meth)));
2143 }
2144 }
2145
a0d0e21e 2146 /* Fake up an import/unimport */
4633a7c4
LW		 2147 if (arg && arg->op_type == OP_STUB)
2148 imop = arg; /* no import on explicit () */
b1cb66bf 2149 else if(SvNIOK(((SVOP*)id)->op_sv)) {
2150 imop = Nullop; /* use 5.0; */
2151 }
4633a7c4
LW		 2152 else {
2153 /* Make copy of id so we don't free it twice */
2154 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
4633a7c4
LW		 2155 meth = newSVOP(OP_CONST, 0,
2156 aver
2157 ? newSVpv("import", 6)
2158 : newSVpv("unimport", 8)
2159 );
2160 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
a0d0e21e
LW		 2161 append_elem(OP_LIST,
2162 prepend_elem(OP_LIST, pack, list(arg)),
2163 newUNOP(OP_METHOD, 0, meth)));
4633a7c4
LW		 2164 }
2165
2166 /* Fake up a require */
2167 rqop = newUNOP(OP_REQUIRE, 0, id);
a0d0e21e
LW		 2168
2169 /* Fake up the BEGIN {}, which does its thing immediately. */
c07a80fd 2170 newSUB(floor,
a0d0e21e 2171 newSVOP(OP_CONST, 0, newSVpv("BEGIN", 5)),
4633a7c4 2172 Nullop,
a0d0e21e 2173 append_elem(OP_LINESEQ,
b1cb66bf 2174 append_elem(OP_LINESEQ,
2175 newSTATEOP(0, Nullch, rqop),
2176 newSTATEOP(0, Nullch, veop)),
a0d0e21e 2177 newSTATEOP(0, Nullch, imop) ));
85e6fe83 2178
85e6fe83
LW		 2179 copline = NOLINE;
2180 expect = XSTATE;
2181}
2182
79072805
LW		 2183OP *
2184newSLICEOP(flags, subscript, listval)
2185I32 flags;
2186OP *subscript;
2187OP *listval;
2188{
2189 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 2190 list(force_list(subscript)),
2191 list(force_list(listval)) );
79072805
LW		 2192}
2193
2194static I32
2195list_assignment(op)
2196register OP *op;
2197{
2198 if (!op)
2199 return TRUE;
2200
2201 if (op->op_type == OP_NULL && op->op_flags & OPf_KIDS)
2202 op = cUNOP->op_first;
2203
2204 if (op->op_type == OP_COND_EXPR) {
2205 I32 t = list_assignment(cCONDOP->op_first->op_sibling);
2206 I32 f = list_assignment(cCONDOP->op_first->op_sibling->op_sibling);
2207
2208 if (t && f)
2209 return TRUE;
2210 if (t || f)
2211 yyerror("Assignment to both a list and a scalar");
2212 return FALSE;
2213 }
2214
2215 if (op->op_type == OP_LIST || op->op_flags & OPf_PARENS ||
2216 op->op_type == OP_RV2AV || op->op_type == OP_RV2HV ||
2217 op->op_type == OP_ASLICE || op->op_type == OP_HSLICE)
2218 return TRUE;
2219
93a17b20
LW		 2220 if (op->op_type == OP_PADAV || op->op_type == OP_PADHV)
2221 return TRUE;
2222
79072805
LW		 2223 if (op->op_type == OP_RV2SV)
2224 return FALSE;
2225
2226 return FALSE;
2227}
2228
2229OP *
a0d0e21e 2230newASSIGNOP(flags, left, optype, right)
79072805
LW		 2231I32 flags;
2232OP *left;
a0d0e21e 2233I32 optype;
79072805
LW		 2234OP *right;
2235{
2236 OP *op;
2237
a0d0e21e
LW		 2238 if (optype) {
2239 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN) {
2240 return newLOGOP(optype, 0,
2241 mod(scalar(left), optype),
2242 newUNOP(OP_SASSIGN, 0, scalar(right)));
2243 }
2244 else {
2245 return newBINOP(optype, OPf_STACKED,
2246 mod(scalar(left), optype), scalar(right));
2247 }
2248 }
2249
79072805 2250 if (list_assignment(left)) {
463ee0b2 2251 modcount = 0;
748a9306 2252 eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 2253 left = mod(left, OP_AASSIGN);
748a9306
LW		 2254 if (eval_start)
2255 eval_start = 0;
2256 else {
a0d0e21e
LW		 2257 op_free(left);
2258 op_free(right);
2259 return Nullop;
2260 }
79072805 2261 op = newBINOP(OP_AASSIGN, flags,
8990e307
LW		 2262 list(force_list(right)),
2263 list(force_list(left)) );
c07a80fd 2264 op->op_private = 0 | (flags >> 8);
a0d0e21e 2265 if (!(left->op_private & OPpLVAL_INTRO)) {
748a9306 2266 static int generation = 100;
79072805
LW		 2267 OP *curop;
2268 OP *lastop = op;
2269 generation++;
2270 for (curop = LINKLIST(op); curop != op; curop = LINKLIST(curop)) {
2271 if (opargs[curop->op_type] & OA_DANGEROUS) {
2272 if (curop->op_type == OP_GV) {
2273 GV *gv = ((GVOP*)curop)->op_gv;
2274 if (gv == defgv || SvCUR(gv) == generation)
2275 break;
2276 SvCUR(gv) = generation;
2277 }
748a9306
LW		 2278 else if (curop->op_type == OP_PADSV ||
2279 curop->op_type == OP_PADAV ||
2280 curop->op_type == OP_PADHV ||
2281 curop->op_type == OP_PADANY) {
2282 SV **svp = AvARRAY(comppad_name);
8e07c86e 2283 SV *sv = svp[curop->op_targ];
748a9306
LW		 2284 if (SvCUR(sv) == generation)
2285 break;
2286 SvCUR(sv) = generation; /* (SvCUR not used any more) */
2287 }
79072805
LW		 2288 else if (curop->op_type == OP_RV2CV)
2289 break;
2290 else if (curop->op_type == OP_RV2SV ||
2291 curop->op_type == OP_RV2AV ||
2292 curop->op_type == OP_RV2HV ||
2293 curop->op_type == OP_RV2GV) {
2294 if (lastop->op_type != OP_GV) /* funny deref? */
2295 break;
2296 }
2297 else
2298 break;
2299 }
2300 lastop = curop;
2301 }
2302 if (curop != op)
2303 op->op_private = OPpASSIGN_COMMON;
2304 }
c07a80fd 2305 if (right && right->op_type == OP_SPLIT) {
2306 OP* tmpop;
2307 if ((tmpop = ((LISTOP*)right)->op_first) &&
2308 tmpop->op_type == OP_PUSHRE)
2309 {
2310 PMOP *pm = (PMOP*)tmpop;
2311 if (left->op_type == OP_RV2AV &&
2312 !(left->op_private & OPpLVAL_INTRO) &&
2313 !(op->op_private & OPpASSIGN_COMMON) )
2314 {
2315 tmpop = ((UNOP*)left)->op_first;
2316 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
2317 pm->op_pmreplroot = (OP*)((GVOP*)tmpop)->op_gv;
2318 pm->op_pmflags |= PMf_ONCE;
2319 tmpop = ((UNOP*)op)->op_first; /* to list (nulled) */
2320 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
2321 tmpop->op_sibling = Nullop; /* don't free split */
2322 right->op_next = tmpop->op_next; /* fix starting loc */
2323 op_free(op); /* blow off assign */
a5f75d66
AD		 2324 right->op_flags &= ~(OPf_KNOW|OPf_LIST);
2325 /* "I don't know and I don't care." */
c07a80fd 2326 return right;
2327 }
2328 }
2329 else {
2330 if (modcount < 10000 &&
2331 ((LISTOP*)right)->op_last->op_type == OP_CONST)
2332 {
2333 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
2334 if (SvIVX(sv) == 0)
2335 sv_setiv(sv, modcount+1);
2336 }
2337 }
2338 }
2339 }
79072805
LW		 2340 return op;
2341 }
2342 if (!right)
2343 right = newOP(OP_UNDEF, 0);
2344 if (right->op_type == OP_READLINE) {
2345 right->op_flags |= OPf_STACKED;
463ee0b2 2346 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 2347 }
a0d0e21e 2348 else {
748a9306 2349 eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
79072805 2350 op = newBINOP(OP_SASSIGN, flags,
463ee0b2 2351 scalar(right), mod(scalar(left), OP_SASSIGN) );
748a9306
LW		 2352 if (eval_start)
2353 eval_start = 0;
2354 else {
a0d0e21e
LW		 2355 op_free(op);
2356 return Nullop;
2357 }
2358 }
79072805
LW		 2359 return op;
2360}
2361
2362OP *
2363newSTATEOP(flags, label, op)
2364I32 flags;
2365char *label;
2366OP *op;
2367{
bbce6d69 2368 U32 seq = intro_my();
79072805
LW		 2369 register COP *cop;
2370
2371 Newz(1101, cop, 1, COP);
8990e307
LW		 2372 if (perldb && curcop->cop_line && curstash != debstash) {
2373 cop->op_type = OP_DBSTATE;
2374 cop->op_ppaddr = ppaddr[ OP_DBSTATE ];
2375 }
2376 else {
2377 cop->op_type = OP_NEXTSTATE;
2378 cop->op_ppaddr = ppaddr[ OP_NEXTSTATE ];
2379 }
79072805 2380 cop->op_flags = flags;
c07a80fd 2381 cop->op_private = 0 | (flags >> 8);
ff0cee69 2382#ifdef NATIVE_HINTS
2383 cop->op_private |= NATIVE_HINTS;
2384#endif
79072805
LW		 2385 cop->op_next = (OP*)cop;
2386
463ee0b2
LW		 2387 if (label) {
2388 cop->cop_label = label;
85e6fe83 2389 hints |= HINT_BLOCK_SCOPE;
463ee0b2 2390 }
bbce6d69 2391 cop->cop_seq = seq;
a0d0e21e 2392 cop->cop_arybase = curcop->cop_arybase;
79072805
LW		 2393
2394 if (copline == NOLINE)
2395 cop->cop_line = curcop->cop_line;
2396 else {
2397 cop->cop_line = copline;
2398 copline = NOLINE;
2399 }
44a8e56a 2400 cop->cop_filegv = (GV*)SvREFCNT_inc(curcop->cop_filegv);
79072805
LW		 2401 cop->cop_stash = curstash;
2402
8990e307 2403 if (perldb && curstash != debstash) {
93a17b20
LW		 2404 SV **svp = av_fetch(GvAV(curcop->cop_filegv),(I32)cop->cop_line, FALSE);
2405 if (svp && *svp != &sv_undef && !SvIOK(*svp)) {
a0d0e21e 2406 (void)SvIOK_on(*svp);
a5f75d66 2407 SvIVX(*svp) = 1;
93a17b20
LW		 2408 SvSTASH(*svp) = (HV*)cop;
2409 }
2410 }
2411
79072805
LW		 2412 return prepend_elem(OP_LINESEQ, (OP*)cop, op);
2413}
2414
bbce6d69 2415/* "Introduce" my variables to visible status. */
2416U32
2417intro_my()
2418{
2419 SV **svp;
2420 SV *sv;
2421 I32 i;
2422
2423 if (! min_intro_pending)
2424 return cop_seqmax;
2425
2426 svp = AvARRAY(comppad_name);
2427 for (i = min_intro_pending; i <= max_intro_pending; i++) {
2428 if ((sv = svp[i]) && sv != &sv_undef && !SvIVX(sv)) {
2429 SvIVX(sv) = 999999999; /* Don't know scope end yet. */
2430 SvNVX(sv) = (double)cop_seqmax;
2431 }
2432 }
2433 min_intro_pending = 0;
2434 comppad_name_fill = max_intro_pending; /* Needn't search higher */
2435 return cop_seqmax++;
2436}
2437
79072805
LW		 2438OP *
2439newLOGOP(type, flags, first, other)
2440I32 type;
2441I32 flags;
2442OP* first;
2443OP* other;
2444{
2445 LOGOP *logop;
2446 OP *op;
2447
a0d0e21e
LW		 2448 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
2449 return newBINOP(type, flags, scalar(first), scalar(other));
2450
8990e307 2451 scalarboolean(first);
79072805
LW		 2452 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
2453 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
2454 if (type == OP_AND || type == OP_OR) {
2455 if (type == OP_AND)
2456 type = OP_OR;
2457 else
2458 type = OP_AND;
2459 op = first;
2460 first = cUNOP->op_first;
2461 if (op->op_next)
2462 first->op_next = op->op_next;
2463 cUNOP->op_first = Nullop;
2464 op_free(op);
2465 }
2466 }
2467 if (first->op_type == OP_CONST) {
93a17b20 2468 if (dowarn && (first->op_private & OPpCONST_BARE))
c07a80fd 2469 warn("Probable precedence problem on %s", op_desc[type]);
79072805
LW		 2470 if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
2471 op_free(first);
2472 return other;
2473 }
2474 else {
2475 op_free(other);
2476 return first;
2477 }
2478 }
2479 else if (first->op_type == OP_WANTARRAY) {
2480 if (type == OP_AND)
2481 list(other);
2482 else
2483 scalar(other);
2484 }
a6006777 2485 else if (dowarn && (first->op_flags & OPf_KIDS)) {
2486 OP *k1 = ((UNOP*)first)->op_first;
2487 OP *k2 = k1->op_sibling;
2488 OPCODE warnop = 0;
2489 switch (first->op_type)
2490 {
2491 case OP_NULL:
2492 if (k2 && k2->op_type == OP_READLINE
2493 && (k2->op_flags & OPf_STACKED)
2494 && (k1->op_type == OP_RV2SV || k1->op_type == OP_PADSV))
2495 warnop = k2->op_type;
2496 break;
2497
2498 case OP_SASSIGN:
2499 if (k1->op_type == OP_READDIR || k1->op_type == OP_GLOB)
2500 warnop = k1->op_type;
2501 break;
2502 }
8ebc5c01 2503 if (warnop) {
2504 line_t oldline = curcop->cop_line;
2505 curcop->cop_line = copline;
2506 warn("Value of %s construct can be \"0\"; test with defined()",
2507 op_desc[warnop]);
2508 curcop->cop_line = oldline;
2509 }
a6006777 2510 }
79072805
LW		 2511
2512 if (!other)
2513 return first;
2514
a0d0e21e
LW		 2515 if (type == OP_ANDASSIGN || type == OP_ORASSIGN)
2516 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
2517
79072805
LW		 2518 Newz(1101, logop, 1, LOGOP);
2519
2520 logop->op_type = type;
2521 logop->op_ppaddr = ppaddr[type];
2522 logop->op_first = first;
2523 logop->op_flags = flags | OPf_KIDS;
2524 logop->op_other = LINKLIST(other);
c07a80fd 2525 logop->op_private = 1 | (flags >> 8);
79072805
LW		 2526
2527 /* establish postfix order */
2528 logop->op_next = LINKLIST(first);
2529 first->op_next = (OP*)logop;
2530 first->op_sibling = other;
2531
2532 op = newUNOP(OP_NULL, 0, (OP*)logop);
2533 other->op_next = op;
2534
2535 return op;
2536}
2537
2538OP *
b1cb66bf 2539newCONDOP(flags, first, trueop, falseop)
79072805
LW		 2540I32 flags;
2541OP* first;
b1cb66bf 2542OP* trueop;
2543OP* falseop;
79072805
LW		 2544{
2545 CONDOP *condop;
2546 OP *op;
2547
b1cb66bf 2548 if (!falseop)
2549 return newLOGOP(OP_AND, 0, first, trueop);
2550 if (!trueop)
2551 return newLOGOP(OP_OR, 0, first, falseop);
79072805 2552
8990e307 2553 scalarboolean(first);
79072805
LW		 2554 if (first->op_type == OP_CONST) {
2555 if (SvTRUE(((SVOP*)first)->op_sv)) {
2556 op_free(first);
b1cb66bf 2557 op_free(falseop);
2558 return trueop;
79072805
LW		 2559 }
2560 else {
2561 op_free(first);
b1cb66bf 2562 op_free(trueop);
2563 return falseop;
79072805
LW		 2564 }
2565 }
2566 else if (first->op_type == OP_WANTARRAY) {
b1cb66bf 2567 list(trueop);
2568 scalar(falseop);
79072805
LW		 2569 }
2570 Newz(1101, condop, 1, CONDOP);
2571
2572 condop->op_type = OP_COND_EXPR;
2573 condop->op_ppaddr = ppaddr[OP_COND_EXPR];
2574 condop->op_first = first;
2575 condop->op_flags = flags | OPf_KIDS;
b1cb66bf 2576 condop->op_true = LINKLIST(trueop);
2577 condop->op_false = LINKLIST(falseop);
c07a80fd 2578 condop->op_private = 1 | (flags >> 8);
79072805
LW		 2579
2580 /* establish postfix order */
2581 condop->op_next = LINKLIST(first);
2582 first->op_next = (OP*)condop;
2583
b1cb66bf 2584 first->op_sibling = trueop;
2585 trueop->op_sibling = falseop;
79072805
LW		 2586 op = newUNOP(OP_NULL, 0, (OP*)condop);
2587
b1cb66bf 2588 trueop->op_next = op;
2589 falseop->op_next = op;
79072805
LW		 2590
2591 return op;
2592}
2593
2594OP *
2595newRANGE(flags, left, right)
2596I32 flags;
2597OP *left;
2598OP *right;
2599{
2600 CONDOP *condop;
2601 OP *flip;
2602 OP *flop;
2603 OP *op;
2604
2605 Newz(1101, condop, 1, CONDOP);
2606
2607 condop->op_type = OP_RANGE;
2608 condop->op_ppaddr = ppaddr[OP_RANGE];
2609 condop->op_first = left;
2610 condop->op_flags = OPf_KIDS;
2611 condop->op_true = LINKLIST(left);
2612 condop->op_false = LINKLIST(right);
c07a80fd 2613 condop->op_private = 1 | (flags >> 8);
79072805
LW		 2614
2615 left->op_sibling = right;
2616
2617 condop->op_next = (OP*)condop;
2618 flip = newUNOP(OP_FLIP, flags, (OP*)condop);
2619 flop = newUNOP(OP_FLOP, 0, flip);
2620 op = newUNOP(OP_NULL, 0, flop);
2621 linklist(flop);
2622
2623 left->op_next = flip;
2624 right->op_next = flop;
2625
ed6116ce 2626 condop->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805 2627 sv_upgrade(PAD_SV(condop->op_targ), SVt_PVNV);
ed6116ce 2628 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 2629 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
2630
2631 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
2632 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
2633
2634 flip->op_next = op;
2635 if (!flip->op_private || !flop->op_private)
2636 linklist(op); /* blow off optimizer unless constant */
2637
2638 return op;
2639}
2640
2641OP *
2642newLOOPOP(flags, debuggable, expr, block)
2643I32 flags;
2644I32 debuggable;
2645OP *expr;
2646OP *block;
2647{
463ee0b2 2648 OP* listop;
93a17b20 2649 OP* op;
463ee0b2 2650 int once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 2651 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
93a17b20 2652
463ee0b2
LW		 2653 if (expr) {
2654 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
2655 return block; /* do {} while 0 does once */
774d564b 2656 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB) {
2657 expr = newUNOP(OP_DEFINED, 0,
2658 newASSIGNOP(0, newSVREF(newGVOP(OP_GV, 0, defgv)), 0, expr) );
2659 }
463ee0b2 2660 }
93a17b20 2661
8990e307 2662 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
93a17b20 2663 op = newLOGOP(OP_AND, 0, expr, listop);
463ee0b2 2664
79072805
LW		 2665 ((LISTOP*)listop)->op_last->op_next = LINKLIST(op);
2666
463ee0b2 2667 if (once && op != listop)
79072805
LW		 2668 op->op_next = ((LOGOP*)cUNOP->op_first)->op_other;
2669
748a9306
LW		 2670 if (op == listop)
2671 op = newUNOP(OP_NULL, 0, op); /* or do {} while 1 loses outer block */
2672
79072805 2673 op->op_flags |= flags;
a0d0e21e 2674 op = scope(op);
748a9306 2675 op->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
a0d0e21e 2676 return op;
79072805
LW		 2677}
2678
2679OP *
2680newWHILEOP(flags, debuggable, loop, expr, block, cont)
2681I32 flags;
2682I32 debuggable;
2683LOOP *loop;
2684OP *expr;
2685OP *block;
2686OP *cont;
2687{
2688 OP *redo;
2689 OP *next = 0;
2690 OP *listop;
2691 OP *op;
2692 OP *condop;
2693
748a9306
LW		 2694 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB)) {
2695 expr = newUNOP(OP_DEFINED, 0,
2696 newASSIGNOP(0, newSVREF(newGVOP(OP_GV, 0, defgv)), 0, expr) );
2697 }
79072805
LW		 2698
2699 if (!block)
2700 block = newOP(OP_NULL, 0);
2701
2702 if (cont)
2703 next = LINKLIST(cont);
2704 if (expr)
2705 cont = append_elem(OP_LINESEQ, cont, newOP(OP_UNSTACK, 0));
2706
463ee0b2 2707 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 2708 redo = LINKLIST(listop);
2709
2710 if (expr) {
2711 op = newLOGOP(OP_AND, 0, expr, scalar(listop));
85e6fe83
LW		 2712 if (op == expr && op->op_type == OP_CONST && !SvTRUE(cSVOP->op_sv)) {
2713 op_free(expr); /* oops, it's a while (0) */
463ee0b2
LW		 2714 op_free((OP*)loop);
2715 return Nullop; /* (listop already freed by newLOGOP) */
2716 }
79072805
LW		 2717 ((LISTOP*)listop)->op_last->op_next = condop =
2718 (op == listop ? redo : LINKLIST(op));
2719 if (!next)
2720 next = condop;
2721 }
2722 else
2723 op = listop;
2724
2725 if (!loop) {
2726 Newz(1101,loop,1,LOOP);
2727 loop->op_type = OP_ENTERLOOP;
2728 loop->op_ppaddr = ppaddr[OP_ENTERLOOP];
2729 loop->op_private = 0;
2730 loop->op_next = (OP*)loop;
2731 }
2732
463ee0b2 2733 op = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, op);
79072805
LW		 2734
2735 loop->op_redoop = redo;
2736 loop->op_lastop = op;
2737
2738 if (next)
2739 loop->op_nextop = next;
2740 else
2741 loop->op_nextop = op;
2742
2743 op->op_flags |= flags;
c07a80fd 2744 op->op_private |= (flags >> 8);
79072805
LW		 2745 return op;
2746}
2747
2748OP *
a0d0e21e 2749#ifndef CAN_PROTOTYPE
79072805
LW		 2750newFOROP(flags,label,forline,sv,expr,block,cont)
2751I32 flags;
2752char *label;
2753line_t forline;
2754OP* sv;
2755OP* expr;
2756OP*block;
2757OP*cont;
8990e307
LW		 2758#else
2759newFOROP(I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *block,OP *cont)
a0d0e21e 2760#endif /* CAN_PROTOTYPE */
79072805
LW		 2761{
2762 LOOP *loop;
85e6fe83 2763 int padoff = 0;
4633a7c4 2764 I32 iterflags = 0;
79072805
LW		 2765
2766 copline = forline;
2767 if (sv) {
85e6fe83 2768 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
748a9306
LW		 2769 sv->op_type = OP_RV2GV;
2770 sv->op_ppaddr = ppaddr[OP_RV2GV];
79072805 2771 }
85e6fe83
LW		 2772 else if (sv->op_type == OP_PADSV) { /* private variable */
2773 padoff = sv->op_targ;
2774 op_free(sv);
2775 sv = Nullop;
2776 }
79072805 2777 else
c07a80fd 2778 croak("Can't use %s for loop variable", op_desc[sv->op_type]);
79072805
LW		 2779 }
2780 else {
2781 sv = newGVOP(OP_GV, 0, defgv);
2782 }
5f05dabc 2783 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
4633a7c4
LW		 2784 expr = scalar(ref(expr, OP_ITER));
2785 iterflags |= OPf_STACKED;
2786 }
2787 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
a0d0e21e
LW		 2788 append_elem(OP_LIST, mod(force_list(expr), OP_GREPSTART),
2789 scalar(sv))));
85e6fe83
LW		 2790 assert(!loop->op_next);
2791 Renew(loop, 1, LOOP);
2792 loop->op_targ = padoff;
2793 return newSTATEOP(0, label, newWHILEOP(flags, 1, loop,
2794 newOP(OP_ITER, 0), block, cont));
79072805
LW		 2795}
2796
8990e307
LW		 2797OP*
2798newLOOPEX(type, label)
2799I32 type;
2800OP* label;
2801{
2802 OP *op;
2803 if (type != OP_GOTO || label->op_type == OP_CONST) {
a0d0e21e
LW		 2804 op = newPVOP(type, 0, savepv(
2805 label->op_type == OP_CONST
2806 ? SvPVx(((SVOP*)label)->op_sv, na)
2807 : "" ));
8990e307
LW		 2808 op_free(label);
2809 }
2810 else {
a0d0e21e
LW		 2811 if (label->op_type == OP_ENTERSUB)
2812 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
8990e307
LW		 2813 op = newUNOP(type, OPf_STACKED, label);
2814 }
85e6fe83 2815 hints |= HINT_BLOCK_SCOPE;
8990e307
LW		 2816 return op;
2817}
2818
79072805 2819void
85e6fe83 2820cv_undef(cv)
79072805
LW		 2821CV *cv;
2822{
a0d0e21e
LW		 2823 if (!CvXSUB(cv) && CvROOT(cv)) {
2824 if (CvDEPTH(cv))
2825 croak("Can't undef active subroutine");
8990e307 2826 ENTER;
a0d0e21e
LW		 2827
2828 SAVESPTR(curpad);
2829 curpad = 0;
2830
a5f75d66 2831 if (!CvCLONED(cv))
748a9306 2832 op_free(CvROOT(cv));
79072805 2833 CvROOT(cv) = Nullop;
8990e307 2834 LEAVE;
79072805 2835 }
44a8e56a 2836 CvFLAGS(cv) = 0;
8e07c86e
AD		 2837 SvREFCNT_dec(CvGV(cv));
2838 CvGV(cv) = Nullgv;
2839 SvREFCNT_dec(CvOUTSIDE(cv));
2840 CvOUTSIDE(cv) = Nullcv;
2841 if (CvPADLIST(cv)) {
8ebc5c01 2842 /* may be during global destruction */
2843 if (SvREFCNT(CvPADLIST(cv))) {
2844 I32 i = AvFILL(CvPADLIST(cv));
2845 while (i >= 0) {
2846 SV** svp = av_fetch(CvPADLIST(cv), i--, FALSE);
2847 if (svp)
2848 SvREFCNT_dec(*svp);
2849 }
2850 SvREFCNT_dec((SV*)CvPADLIST(cv));
8e07c86e 2851 }
8e07c86e
AD		 2852 CvPADLIST(cv) = Nullav;
2853 }
79072805
LW		 2854}
2855
5f05dabc 2856#ifdef DEBUG_CLOSURES
2857static void
2858cv_dump(cv)
2859CV* cv;
2860{
2861 CV *outside = CvOUTSIDE(cv);
2862 AV* padlist = CvPADLIST(cv);
4fdae800 2863 AV* pad_name;
2864 AV* pad;
2865 SV** pname;
2866 SV** ppad;
5f05dabc 2867 I32 ix;
2868
2869 PerlIO_printf(Perl_debug_log, "\tCV=0x%p (%s), OUTSIDE=0x%p (%s)\n",
ab50184a
CS		 2870 cv,
2871 (CvANON(cv) ? "ANON"
2872 : (cv == main_cv) ? "MAIN"
07055b4c 2873 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 2874 : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
ab50184a
CS		 2875 outside,
2876 (!outside ? "null"
2877 : CvANON(outside) ? "ANON"
2878 : (outside == main_cv) ? "MAIN"
07055b4c 2879 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 2880 : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
5f05dabc 2881
4fdae800 2882 if (!padlist)
2883 return;
2884
2885 pad_name = (AV*)*av_fetch(padlist, 0, FALSE);
2886 pad = (AV*)*av_fetch(padlist, 1, FALSE);
2887 pname = AvARRAY(pad_name);
2888 ppad = AvARRAY(pad);
2889
9607fc9c 2890 for (ix = 1; ix <= AvFILL(pad_name); ix++) {
5f05dabc 2891 if (SvPOK(pname[ix]))
4fdae800 2892 PerlIO_printf(Perl_debug_log, "\t%4d. 0x%p (%s\"%s\" %ld-%ld)\n",
2893 ix, ppad[ix],
2894 SvFAKE(pname[ix]) ? "FAKE " : "",
2895 SvPVX(pname[ix]),
ab50184a
CS		 2896 (long)I_32(SvNVX(pname[ix])),
2897 (long)SvIVX(pname[ix]));
5f05dabc 2898 }
2899}
2900#endif /* DEBUG_CLOSURES */
2901
2902static CV *
2903cv_clone2(proto, outside)
748a9306 2904CV* proto;
5f05dabc 2905CV* outside;
748a9306
LW		 2906{
2907 AV* av;
2908 I32 ix;
2909 AV* protopadlist = CvPADLIST(proto);
2910 AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE);
2911 AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE);
5f05dabc 2912 SV** pname = AvARRAY(protopad_name);
2913 SV** ppad = AvARRAY(protopad);
9607fc9c 2914 I32 fname = AvFILL(protopad_name);
2915 I32 fpad = AvFILL(protopad);
748a9306
LW		 2916 AV* comppadlist;
2917 CV* cv;
2918
07055b4c
CS		 2919 assert(!CvUNIQUE(proto));
2920
748a9306
LW		 2921 ENTER;
2922 SAVESPTR(curpad);
2923 SAVESPTR(comppad);
2924 SAVESPTR(compcv);
2925
2926 cv = compcv = (CV*)NEWSV(1104,0);
fa83b5b6 2927 sv_upgrade((SV *)cv, SvTYPE(proto));
a5f75d66 2928 CvCLONED_on(cv);
5f05dabc 2929 if (CvANON(proto))
2930 CvANON_on(cv);
748a9306
LW		 2931
2932 CvFILEGV(cv) = CvFILEGV(proto);
44a8e56a 2933 CvGV(cv) = (GV*)SvREFCNT_inc(CvGV(proto));
748a9306
LW		 2934 CvSTASH(cv) = CvSTASH(proto);
2935 CvROOT(cv) = CvROOT(proto);
2936 CvSTART(cv) = CvSTART(proto);
5f05dabc 2937 if (outside)
2938 CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside);
748a9306
LW		 2939
2940 comppad = newAV();
2941
2942 comppadlist = newAV();
2943 AvREAL_off(comppadlist);
2944 av_store(comppadlist, 0, SvREFCNT_inc((SV*)protopad_name));
b355b4e0 2945 av_store(comppadlist, 1, (SV*)comppad);
748a9306 2946 CvPADLIST(cv) = comppadlist;
5f05dabc 2947 av_fill(comppad, AvFILL(protopad));
748a9306
LW		 2948 curpad = AvARRAY(comppad);
2949
2950 av = newAV(); /* will be @_ */
2951 av_extend(av, 0);
2952 av_store(comppad, 0, (SV*)av);
2953 AvFLAGS(av) = AVf_REIFY;
2954
9607fc9c 2955 for (ix = fpad; ix > 0; ix--) {
2956 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
aa689395 2957 if (namesv && namesv != &sv_undef) {
2958 char *name = SvPVX(namesv); /* XXX */
2959 if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */
2960 I32 off = pad_findlex(name, ix, SvIVX(namesv),
5f05dabc 2961 CvOUTSIDE(cv), cxstack_ix);
2962 if (!off)
2963 curpad[ix] = SvREFCNT_inc(ppad[ix]);
2964 else if (off != ix)
748a9306
LW		 2965 croak("panic: cv_clone: %s", name);
2966 }
2967 else { /* our own lexical */
aa689395 2968 SV* sv;
5f05dabc 2969 if (*name == '&') {
2970 /* anon code -- we'll come back for it */
2971 sv = SvREFCNT_inc(ppad[ix]);
2972 }
2973 else if (*name == '@')
2974 sv = (SV*)newAV();
748a9306 2975 else if (*name == '%')
5f05dabc 2976 sv = (SV*)newHV();
748a9306 2977 else
5f05dabc 2978 sv = NEWSV(0,0);
2979 if (!SvPADBUSY(sv))
2980 SvPADMY_on(sv);
2981 curpad[ix] = sv;
748a9306
LW		 2982 }
2983 }
2984 else {
aa689395 2985 SV* sv = NEWSV(0,0);
748a9306 2986 SvPADTMP_on(sv);
5f05dabc 2987 curpad[ix] = sv;
748a9306
LW		 2988 }
2989 }
2990
5f05dabc 2991 /* Now that vars are all in place, clone nested closures. */
2992
9607fc9c 2993 for (ix = fpad; ix > 0; ix--) {
2994 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
aa689395 2995 if (namesv
2996 && namesv != &sv_undef
2997 && !(SvFLAGS(namesv) & SVf_FAKE)
2998 && *SvPVX(namesv) == '&'
5f05dabc 2999 && CvCLONE(ppad[ix]))
3000 {
3001 CV *kid = cv_clone2((CV*)ppad[ix], cv);
3002 SvREFCNT_dec(ppad[ix]);
3003 CvCLONE_on(kid);
3004 SvPADMY_on(kid);
3005 curpad[ix] = (SV*)kid;
3006 }
3007 }
3008
3009#ifdef DEBUG_CLOSURES
ab50184a
CS		 3010 PerlIO_printf(Perl_debug_log, "Cloned inside:\n");
3011 cv_dump(outside);
3012 PerlIO_printf(Perl_debug_log, " from:\n");
5f05dabc 3013 cv_dump(proto);
ab50184a 3014 PerlIO_printf(Perl_debug_log, " to:\n");
5f05dabc 3015 cv_dump(cv);
3016#endif
3017
748a9306
LW		 3018 LEAVE;
3019 return cv;
3020}
3021
5f05dabc 3022CV *
3023cv_clone(proto)
3024CV* proto;
3025{
3026 return cv_clone2(proto, CvOUTSIDE(proto));
3027}
3028
760ac839
LW		 3029SV *
3030cv_const_sv(cv)
3031CV *cv;
3032{
3033 OP *o;
3034 SV *sv = Nullsv;
3035
3036 if(cv && SvPOK(cv) && !SvCUR(cv)) {
3037 for (o = CvSTART(cv); o; o = o->op_next) {
3038 OPCODE type = o->op_type;
3039
3040 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
3041 continue;
3042 if (type == OP_LEAVESUB || type == OP_RETURN)
3043 break;
3044 if (type != OP_CONST || sv)
3045 return Nullsv;
3046
3047 sv = ((SVOP*)o)->op_sv;
3048 }
3049 }
3050 return sv;
3051}
3052
748a9306 3053CV *
4633a7c4 3054newSUB(floor,op,proto,block)
79072805
LW		 3055I32 floor;
3056OP *op;
4633a7c4 3057OP *proto;
79072805
LW		 3058OP *block;
3059{
44a8e56a 3060 char *name = op ? SvPVx(cSVOP->op_sv, na) : Nullch;
3061 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
79072805 3062 register CV *cv;
44a8e56a 3063 AV *av;
a0d0e21e 3064 I32 ix;
79072805 3065
44a8e56a 3066 if (op)
8ebc5c01 3067 SAVEFREEOP(op);
44a8e56a 3068 if (cv = (name ? GvCV(gv) : Nullcv)) {
a6006777 3069 if (GvCVGEN(gv)) {
3070 /* just a cached method */
3071 SvREFCNT_dec(cv);
3072 cv = 0;
3073 }
a5f75d66 3074 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
28757baa 3075 /* already defined (or promised) */
760ac839 3076
28757baa 3077 SV* const_sv = cv_const_sv(cv);
760ac839
LW		 3078 char *p = proto ? SvPVx(((SVOP*)proto)->op_sv, na) : Nullch;
3079
3080 if((!proto != !SvPOK(cv)) || (p && strNE(SvPV((SV*)cv,na), p))) {
3081 warn("Prototype mismatch: (%s) vs (%s)",
3082 SvPOK(cv) ? SvPV((SV*)cv,na) : "none",
3083 p ? p : "none");
3084 }
aa689395 3085 if (!block) {
3086 /* just a "sub foo;" when &foo is already defined */
3087 SAVEFREESV(compcv);
3088 goto done;
3089 }
44a8e56a 3090 if (const_sv || dowarn) {
79072805 3091 line_t oldline = curcop->cop_line;
79072805 3092 curcop->cop_line = copline;
760ac839
LW		 3093 warn(const_sv ? "Constant subroutine %s redefined"
3094 : "Subroutine %s redefined",name);
79072805
LW		 3095 curcop->cop_line = oldline;
3096 }
8990e307 3097 SvREFCNT_dec(cv);
a0d0e21e 3098 cv = 0;
79072805
LW		 3099 }
3100 }
a0d0e21e 3101 if (cv) { /* must reuse cv if autoloaded */
4633a7c4 3102 cv_undef(cv);
44a8e56a 3103 CvFLAGS(cv) = CvFLAGS(compcv);
748a9306 3104 CvOUTSIDE(cv) = CvOUTSIDE(compcv);
e9a444f0 3105 CvOUTSIDE(compcv) = 0;
748a9306 3106 CvPADLIST(cv) = CvPADLIST(compcv);
4aa0a1f7 3107 CvPADLIST(compcv) = 0;
4633a7c4
LW		 3108 if (SvREFCNT(compcv) > 1) /* XXX Make closures transit through stub. */
3109 CvOUTSIDE(compcv) = (CV*)SvREFCNT_inc((SV*)cv);
748a9306 3110 SvREFCNT_dec(compcv);
a0d0e21e
LW		 3111 }
3112 else {
748a9306 3113 cv = compcv;
44a8e56a 3114 if (name) {
3115 GvCV(gv) = cv;
3116 GvCVGEN(gv) = 0;
3117 sub_generation++;
3118 }
a0d0e21e 3119 }
44a8e56a 3120 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
79072805 3121 CvFILEGV(cv) = curcop->cop_filegv;
8990e307
LW		 3122 CvSTASH(cv) = curstash;
3123
4633a7c4
LW		 3124 if (proto) {
3125 char *p = SvPVx(((SVOP*)proto)->op_sv, na);
4633a7c4 3126 sv_setpv((SV*)cv, p);
c07a80fd 3127 op_free(proto);
4633a7c4
LW		 3128 }
3129
c07a80fd 3130 if (error_count) {
3131 op_free(block);
3132 block = Nullop;
3133 }
a0d0e21e 3134 if (!block) {
a0d0e21e
LW		 3135 copline = NOLINE;
3136 LEAVE_SCOPE(floor);
3137 return cv;
3138 }
3139
3140 av = newAV(); /* Will be @_ */
3141 av_extend(av, 0);
8990e307 3142 av_store(comppad, 0, (SV*)av);
a0d0e21e
LW		 3143 AvFLAGS(av) = AVf_REIFY;
3144
3145 for (ix = AvFILL(comppad); ix > 0; ix--) {
44a8e56a 3146 if (!SvPADMY(curpad[ix]) && !SvIMMORTAL(curpad[ix]))
a0d0e21e
LW		 3147 SvPADTMP_on(curpad[ix]);
3148 }
79072805 3149
8990e307
LW		 3150 if (AvFILL(comppad_name) < AvFILL(comppad))
3151 av_store(comppad_name, AvFILL(comppad), Nullsv);
79072805 3152
a0d0e21e 3153 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
79072805
LW		 3154 CvSTART(cv) = LINKLIST(CvROOT(cv));
3155 CvROOT(cv)->op_next = 0;
3156 peep(CvSTART(cv));
a6006777 3157
44a8e56a 3158 if (name) {
3159 char *s;
3160
3161 if (perldb && curstash != debstash) {
3162 SV *sv;
3163 SV *tmpstr = sv_newmortal();
3164 static GV *db_postponed;
3165 CV *cv;
3166 HV *hv;
3167
3168 sprintf(buf, "%s:%ld",
3169 SvPVX(GvSV(curcop->cop_filegv)), (long)subline);
3170 sv = newSVpv(buf,0);
3171 sv_catpv(sv,"-");
3172 sprintf(buf,"%ld",(long)curcop->cop_line);
3173 sv_catpv(sv,buf);
3174 gv_efullname3(tmpstr, gv, Nullch);
3175 hv_store(GvHV(DBsub), SvPVX(tmpstr), SvCUR(tmpstr), sv, 0);
3176 if (!db_postponed) {
6bbcb22c 3177 db_postponed = gv_fetchpv("DB::postponed", GV_ADDMULTI, SVt_PVHV);
44a8e56a 3178 }
3179 hv = GvHVn(db_postponed);
9607fc9c 3180 if (HvFILL(hv) > 0 && hv_exists(hv, SvPVX(tmpstr), SvCUR(tmpstr))
3181 && (cv = GvCV(db_postponed))) {
44a8e56a 3182 dSP;
3183 PUSHMARK(sp);
3184 XPUSHs(tmpstr);
3185 PUTBACK;
3186 perl_call_sv((SV*)cv, G_DISCARD);
3187 }
3188 }
3189
3190 if ((s = strrchr(name,':')))
28757baa 3191 s++;
3192 else
3193 s = name;
3194 if (strEQ(s, "BEGIN") && !error_count) {
3195 ENTER;
3196 SAVESPTR(compiling.cop_filegv);
3197 SAVEI16(compiling.cop_line);
3198 SAVEI32(perldb);
3199 save_svref(&rs);
3200 sv_setsv(rs, nrs);
3201
3202 if (!beginav)
3203 beginav = newAV();
3204 DEBUG_x( dump_sub(gv) );
3205 av_push(beginav, (SV *)cv);
3206 GvCV(gv) = 0;
3207 calllist(beginav);
a6006777 3208
28757baa 3209 curcop = &compiling;
3210 LEAVE;
3211 }
3212 else if (strEQ(s, "END") && !error_count) {
3213 if (!endav)
3214 endav = newAV();
3215 av_unshift(endav, 1);
3216 av_store(endav, 0, (SV *)cv);
3217 GvCV(gv) = 0;
3218 }
93a17b20 3219 }
a6006777 3220
aa689395 3221 done:
a6006777 3222 copline = NOLINE;
3223 LEAVE_SCOPE(floor);
a0d0e21e 3224 return cv;
79072805
LW		 3225}
3226
a0d0e21e
LW		 3227#ifdef DEPRECATED
3228CV *
463ee0b2 3229newXSUB(name, ix, subaddr, filename)
79072805
LW		 3230char *name;
3231I32 ix;
3232I32 (*subaddr)();
3233char *filename;
3234{
a0d0e21e 3235 CV* cv = newXS(name, (void(*)())subaddr, filename);
a5f75d66 3236 CvOLDSTYLE_on(cv);
a0d0e21e
LW		 3237 CvXSUBANY(cv).any_i32 = ix;
3238 return cv;
3239}
3240#endif
3241
3242CV *
3243newXS(name, subaddr, filename)
3244char *name;
3245void (*subaddr) _((CV*));
3246char *filename;
3247{
44a8e56a 3248 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
79072805 3249 register CV *cv;
44a8e56a 3250
3251 if (cv = (name ? GvCV(gv) : Nullcv)) {
3252 if (GvCVGEN(gv)) {
3253 /* just a cached method */
3254 SvREFCNT_dec(cv);
3255 cv = 0;
3256 }
3257 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
3258 /* already defined (or promised) */
a0d0e21e
LW		 3259 if (dowarn) {
3260 line_t oldline = curcop->cop_line;
a0d0e21e
LW		 3261 curcop->cop_line = copline;
3262 warn("Subroutine %s redefined",name);
3263 curcop->cop_line = oldline;
3264 }
3265 SvREFCNT_dec(cv);
3266 cv = 0;
79072805 3267 }
79072805 3268 }
44a8e56a 3269
3270 if (cv) /* must reuse cv if autoloaded */
3271 cv_undef(cv);
a0d0e21e
LW		 3272 else {
3273 cv = (CV*)NEWSV(1105,0);
3274 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 3275 if (name) {
3276 GvCV(gv) = cv;
3277 GvCVGEN(gv) = 0;
3278 sub_generation++;
3279 }
a0d0e21e 3280 }
44a8e56a 3281 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
79072805 3282 CvFILEGV(cv) = gv_fetchfile(filename);
a0d0e21e 3283 CvXSUB(cv) = subaddr;
44a8e56a 3284
28757baa 3285 if (name) {
3286 char *s = strrchr(name,':');
3287 if (s)
3288 s++;
3289 else
3290 s = name;
3291 if (strEQ(s, "BEGIN")) {
3292 if (!beginav)
3293 beginav = newAV();
44a8e56a 3294 av_push(beginav, (SV *)cv);
3295 GvCV(gv) = 0;
28757baa 3296 }
3297 else if (strEQ(s, "END")) {
3298 if (!endav)
3299 endav = newAV();
3300 av_unshift(endav, 1);
44a8e56a 3301 av_store(endav, 0, (SV *)cv);
3302 GvCV(gv) = 0;
28757baa 3303 }
3304 }
44a8e56a 3305 else
a5f75d66 3306 CvANON_on(cv);
44a8e56a 3307
a0d0e21e 3308 return cv;
79072805
LW		 3309}
3310
3311void
3312newFORM(floor,op,block)
3313I32 floor;
3314OP *op;
3315OP *block;
3316{
3317 register CV *cv;
3318 char *name;
3319 GV *gv;
a0d0e21e 3320 I32 ix;
79072805
LW		 3321
3322 if (op)
463ee0b2 3323 name = SvPVx(cSVOP->op_sv, na);
79072805
LW		 3324 else
3325 name = "STDOUT";
85e6fe83 3326 gv = gv_fetchpv(name,TRUE, SVt_PVFM);
a5f75d66 3327 GvMULTI_on(gv);
79072805
LW		 3328 if (cv = GvFORM(gv)) {
3329 if (dowarn) {
3330 line_t oldline = curcop->cop_line;
3331
3332 curcop->cop_line = copline;
3333 warn("Format %s redefined",name);
3334 curcop->cop_line = oldline;
3335 }
8990e307 3336 SvREFCNT_dec(cv);
79072805 3337 }
748a9306 3338 cv = compcv;
79072805 3339 GvFORM(gv) = cv;
44a8e56a 3340 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
79072805
LW		 3341 CvFILEGV(cv) = curcop->cop_filegv;
3342
a0d0e21e 3343 for (ix = AvFILL(comppad); ix > 0; ix--) {
44a8e56a 3344 if (!SvPADMY(curpad[ix]) && !SvIMMORTAL(curpad[ix]))
a0d0e21e
LW		 3345 SvPADTMP_on(curpad[ix]);
3346 }
3347
79072805
LW		 3348 CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
3349 CvSTART(cv) = LINKLIST(CvROOT(cv));
3350 CvROOT(cv)->op_next = 0;
3351 peep(CvSTART(cv));
79072805
LW		 3352 op_free(op);
3353 copline = NOLINE;
8990e307 3354 LEAVE_SCOPE(floor);
79072805
LW		 3355}
3356
3357OP *
79072805
LW		 3358newANONLIST(op)
3359OP* op;
3360{
93a17b20 3361 return newUNOP(OP_REFGEN, 0,
a0d0e21e 3362 mod(list(convert(OP_ANONLIST, 0, op)), OP_REFGEN));
79072805
LW		 3363}
3364
3365OP *
3366newANONHASH(op)
3367OP* op;
3368{
93a17b20 3369 return newUNOP(OP_REFGEN, 0,
a0d0e21e
LW		 3370 mod(list(convert(OP_ANONHASH, 0, op)), OP_REFGEN));
3371}
3372
3373OP *
4633a7c4 3374newANONSUB(floor, proto, block)
a0d0e21e 3375I32 floor;
4633a7c4 3376OP *proto;
a0d0e21e
LW		 3377OP *block;
3378{
3379 return newUNOP(OP_REFGEN, 0,
4633a7c4 3380 newSVOP(OP_ANONCODE, 0, (SV*)newSUB(floor, 0, proto, block)));
79072805
LW		 3381}
3382
3383OP *
3384oopsAV(o)
3385OP *o;
3386{
ed6116ce
LW		 3387 switch (o->op_type) {
3388 case OP_PADSV:
3389 o->op_type = OP_PADAV;
3390 o->op_ppaddr = ppaddr[OP_PADAV];
3391 return ref(newUNOP(OP_RV2AV, 0, scalar(o)), OP_RV2AV);
3392
3393 case OP_RV2SV:
79072805
LW		 3394 o->op_type = OP_RV2AV;
3395 o->op_ppaddr = ppaddr[OP_RV2AV];
3396 ref(o, OP_RV2AV);
ed6116ce
LW		 3397 break;
3398
3399 default:
79072805 3400 warn("oops: oopsAV");
ed6116ce
LW		 3401 break;
3402 }
79072805
LW		 3403 return o;
3404}
3405
3406OP *
3407oopsHV(o)
3408OP *o;
3409{
ed6116ce
LW		 3410 switch (o->op_type) {
3411 case OP_PADSV:
3412 case OP_PADAV:
3413 o->op_type = OP_PADHV;
3414 o->op_ppaddr = ppaddr[OP_PADHV];
3415 return ref(newUNOP(OP_RV2HV, 0, scalar(o)), OP_RV2HV);
3416
3417 case OP_RV2SV:
3418 case OP_RV2AV:
79072805
LW		 3419 o->op_type = OP_RV2HV;
3420 o->op_ppaddr = ppaddr[OP_RV2HV];
3421 ref(o, OP_RV2HV);
ed6116ce
LW		 3422 break;
3423
3424 default:
79072805 3425 warn("oops: oopsHV");
ed6116ce
LW		 3426 break;
3427 }
79072805
LW		 3428 return o;
3429}
3430
3431OP *
3432newAVREF(o)
3433OP *o;
3434{
ed6116ce
LW		 3435 if (o->op_type == OP_PADANY) {
3436 o->op_type = OP_PADAV;
3437 o->op_ppaddr = ppaddr[OP_PADAV];
93a17b20 3438 return o;
ed6116ce 3439 }
79072805
LW		 3440 return newUNOP(OP_RV2AV, 0, scalar(o));
3441}
3442
3443OP *
a0d0e21e
LW		 3444newGVREF(type,o)
3445I32 type;
79072805
LW		 3446OP *o;
3447{
a0d0e21e
LW		 3448 if (type == OP_MAPSTART)
3449 return newUNOP(OP_NULL, 0, o);
748a9306 3450 return ref(newUNOP(OP_RV2GV, OPf_REF, o), type);
79072805
LW		 3451}
3452
3453OP *
3454newHVREF(o)
3455OP *o;
3456{
ed6116ce
LW		 3457 if (o->op_type == OP_PADANY) {
3458 o->op_type = OP_PADHV;
3459 o->op_ppaddr = ppaddr[OP_PADHV];
93a17b20 3460 return o;
ed6116ce 3461 }
79072805
LW		 3462 return newUNOP(OP_RV2HV, 0, scalar(o));
3463}
3464
3465OP *
3466oopsCV(o)
3467OP *o;
3468{
463ee0b2 3469 croak("NOT IMPL LINE %d",__LINE__);
79072805
LW		 3470 /* STUB */
3471 return o;
3472}
3473
3474OP *
c07a80fd 3475newCVREF(flags, o)
3476I32 flags;
79072805
LW		 3477OP *o;
3478{
c07a80fd 3479 return newUNOP(OP_RV2CV, flags, scalar(o));
79072805
LW		 3480}
3481
3482OP *
3483newSVREF(o)
3484OP *o;
3485{
ed6116ce
LW		 3486 if (o->op_type == OP_PADANY) {
3487 o->op_type = OP_PADSV;
3488 o->op_ppaddr = ppaddr[OP_PADSV];
93a17b20 3489 return o;
ed6116ce 3490 }
79072805
LW		 3491 return newUNOP(OP_RV2SV, 0, scalar(o));
3492}
3493
3494/* Check routines. */
3495
3496OP *
5f05dabc 3497ck_anoncode(op)
3498OP *op;
3499{
178c6305
CS		 3500 PADOFFSET ix;
3501 SV* name;
3502
3503 name = NEWSV(1106,0);
3504 sv_upgrade(name, SVt_PVNV);
3505 sv_setpvn(name, "&", 1);
3506 SvIVX(name) = -1;
3507 SvNVX(name) = 1;
3508 ix = pad_alloc(op->op_type, SVs_PADMY);
3509 av_store(comppad_name, ix, name);
5f05dabc 3510 av_store(comppad, ix, cSVOP->op_sv);
3511 SvPADMY_on(cSVOP->op_sv);
3512 cSVOP->op_sv = Nullsv;
3513 cSVOP->op_targ = ix;
3514 return op;
3515}
3516
3517OP *
55497cff 3518ck_bitop(op)
3519OP *op;
3520{
3521 op->op_private = hints;
3522 return op;
3523}
3524
3525OP *
79072805
LW		 3526ck_concat(op)
3527OP *op;
3528{
3529 if (cUNOP->op_first->op_type == OP_CONCAT)
3530 op->op_flags |= OPf_STACKED;
3531 return op;
3532}
3533
3534OP *
a0d0e21e 3535ck_spair(op)
79072805
LW		 3536OP *op;
3537{
3538 if (op->op_flags & OPf_KIDS) {
3539 OP* newop;
a0d0e21e 3540 OP* kid;
8ebc5c01 3541 OPCODE type = op->op_type;
3542 op = modkids(ck_fun(op), type);
a0d0e21e
LW		 3543 kid = cUNOP->op_first;
3544 newop = kUNOP->op_first->op_sibling;
3545 if (newop &&
3546 (newop->op_sibling ||
3547 !(opargs[newop->op_type] & OA_RETSCALAR) ||
3548 newop->op_type == OP_PADAV || newop->op_type == OP_PADHV ||
3549 newop->op_type == OP_RV2AV || newop->op_type == OP_RV2HV)) {
3550
79072805 3551 return op;
a0d0e21e
LW		 3552 }
3553 op_free(kUNOP->op_first);
3554 kUNOP->op_first = newop;
3555 }
3556 op->op_ppaddr = ppaddr[++op->op_type];
3557 return ck_fun(op);
3558}
3559
3560OP *
3561ck_delete(op)
3562OP *op;
3563{
3564 op = ck_fun(op);
5f05dabc 3565 op->op_private = 0;
a0d0e21e
LW		 3566 if (op->op_flags & OPf_KIDS) {
3567 OP *kid = cUNOP->op_first;
5f05dabc 3568 if (kid->op_type == OP_HSLICE)
3569 op->op_private |= OPpSLICE;
3570 else if (kid->op_type != OP_HELEM)
3571 croak("%s argument is not a HASH element or slice",
3572 op_desc[op->op_type]);
a0d0e21e 3573 null(kid);
79072805 3574 }
79072805
LW		 3575 return op;
3576}
3577
3578OP *
3579ck_eof(op)
3580OP *op;
3581{
3582 I32 type = op->op_type;
3583
8990e307
LW		 3584 if (op->op_flags & OPf_KIDS) {
3585 if (cLISTOP->op_first->op_type == OP_STUB) {
3586 op_free(op);
3587 op = newUNOP(type, OPf_SPECIAL,
85e6fe83 3588 newGVOP(OP_GV, 0, gv_fetchpv("main'ARGV", TRUE, SVt_PVAV)));
8990e307 3589 }
79072805 3590 return ck_fun(op);
79072805
LW		 3591 }
3592 return op;
3593}
3594
3595OP *
3596ck_eval(op)
3597OP *op;
3598{
85e6fe83 3599 hints |= HINT_BLOCK_SCOPE;
79072805
LW		 3600 if (op->op_flags & OPf_KIDS) {
3601 SVOP *kid = (SVOP*)cUNOP->op_first;
3602
93a17b20
LW		 3603 if (!kid) {
3604 op->op_flags &= ~OPf_KIDS;
8990e307 3605 null(op);
79072805
LW		 3606 }
3607 else if (kid->op_type == OP_LINESEQ) {
3608 LOGOP *enter;
3609
3610 kid->op_next = op->op_next;
3611 cUNOP->op_first = 0;
3612 op_free(op);
3613
3614 Newz(1101, enter, 1, LOGOP);
3615 enter->op_type = OP_ENTERTRY;
3616 enter->op_ppaddr = ppaddr[OP_ENTERTRY];
3617 enter->op_private = 0;
3618
3619 /* establish postfix order */
3620 enter->op_next = (OP*)enter;
3621
463ee0b2 3622 op = prepend_elem(OP_LINESEQ, (OP*)enter, (OP*)kid);
79072805
LW		 3623 op->op_type = OP_LEAVETRY;
3624 op->op_ppaddr = ppaddr[OP_LEAVETRY];
3625 enter->op_other = op;
3626 return op;
3627 }
3628 }
3629 else {
3630 op_free(op);
3631 op = newUNOP(OP_ENTEREVAL, 0, newSVREF(newGVOP(OP_GV, 0, defgv)));
3632 }
a0d0e21e 3633 op->op_targ = (PADOFFSET)hints;
79072805
LW		 3634 return op;
3635}
3636
3637OP *
3638ck_exec(op)
3639OP *op;
3640{
3641 OP *kid;
79072805 3642 if (op->op_flags & OPf_STACKED) {
463ee0b2 3643 op = ck_fun(op);
79072805 3644 kid = cUNOP->op_first->op_sibling;
8990e307
LW		 3645 if (kid->op_type == OP_RV2GV)
3646 null(kid);
79072805 3647 }
463ee0b2
LW		 3648 else
3649 op = listkids(op);
79072805
LW		 3650 return op;
3651}
3652
3653OP *
5f05dabc 3654ck_exists(op)
3655OP *op;
3656{
3657 op = ck_fun(op);
3658 if (op->op_flags & OPf_KIDS) {
3659 OP *kid = cUNOP->op_first;
3660 if (kid->op_type != OP_HELEM)
3661 croak("%s argument is not a HASH element", op_desc[op->op_type]);
3662 null(kid);
3663 }
3664 return op;
3665}
3666
3667OP *
79072805
LW		 3668ck_gvconst(o)
3669register OP *o;
3670{
3671 o = fold_constants(o);
3672 if (o->op_type == OP_CONST)
3673 o->op_type = OP_GV;
3674 return o;
3675}
3676
3677OP *
3678ck_rvconst(op)
3679register OP *op;
3680{
3681 SVOP *kid = (SVOP*)cUNOP->op_first;
85e6fe83 3682
c07a80fd 3683 op->op_private |= (hints & HINT_STRICT_REFS);
79072805 3684 if (kid->op_type == OP_CONST) {
44a8e56a 3685 char *name;
3686 int iscv;
3687 GV *gv;
3688
3689 name = SvPV(kid->op_sv, na);
3690 if ((hints & HINT_STRICT_REFS) && (kid->op_private & OPpCONST_BARE)) {
3691 char *badthing = Nullch;
3692 switch (op->op_type) {
3693 case OP_RV2SV:
3694 badthing = "a SCALAR";
3695 break;
3696 case OP_RV2AV:
3697 badthing = "an ARRAY";
3698 break;
3699 case OP_RV2HV:
3700 badthing = "a HASH";
3701 break;
3702 }
3703 if (badthing)
3704 croak(
3705 "Can't use bareword (\"%s\") as %s ref while \"strict refs\" in use",
3706 name, badthing);
3707 }
79072805 3708 kid->op_type = OP_GV;
44a8e56a 3709 iscv = (op->op_type == OP_RV2CV) * 2;
a0d0e21e 3710 for (gv = 0; !gv; iscv++) {
748a9306
LW		 3711 /*
3712 * This is a little tricky. We only want to add the symbol if we
3713 * didn't add it in the lexer. Otherwise we get duplicate strict
3714 * warnings. But if we didn't add it in the lexer, we must at
3715 * least pretend like we wanted to add it even if it existed before,
3716 * or we get possible typo warnings. OPpCONST_ENTERED says
3717 * whether the lexer already added THIS instance of this symbol.
3718 */
44a8e56a 3719 gv = gv_fetchpv(name,
748a9306 3720 iscv | !(kid->op_private & OPpCONST_ENTERED),
a0d0e21e
LW		 3721 iscv
3722 ? SVt_PVCV
3723 : op->op_type == OP_RV2SV
3724 ? SVt_PV
3725 : op->op_type == OP_RV2AV
3726 ? SVt_PVAV
3727 : op->op_type == OP_RV2HV
3728 ? SVt_PVHV
3729 : SVt_PVGV);
3730 }
adbc6bb1 3731 SvREFCNT_dec(kid->op_sv);
a0d0e21e 3732 kid->op_sv = SvREFCNT_inc(gv);
79072805
LW		 3733 }
3734 return op;
3735}
3736
3737OP *
79072805
LW		 3738ck_ftst(op)
3739OP *op;
3740{
3741 I32 type = op->op_type;
3742
a0d0e21e 3743 if (op->op_flags & OPf_REF)
79072805
LW		 3744 return op;
3745
3746 if (op->op_flags & OPf_KIDS) {
3747 SVOP *kid = (SVOP*)cUNOP->op_first;
3748
3749 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
a0d0e21e 3750 OP *newop = newGVOP(type, OPf_REF,
85e6fe83 3751 gv_fetchpv(SvPVx(kid->op_sv, na), TRUE, SVt_PVIO));
79072805
LW		 3752 op_free(op);
3753 return newop;
3754 }
3755 }
3756 else {
3757 op_free(op);
3758 if (type == OP_FTTTY)
a0d0e21e 3759 return newGVOP(type, OPf_REF, gv_fetchpv("main'STDIN", TRUE,
85e6fe83 3760 SVt_PVIO));
79072805
LW		 3761 else
3762 return newUNOP(type, 0, newSVREF(newGVOP(OP_GV, 0, defgv)));
3763 }
3764 return op;
3765}
3766
3767OP *
3768ck_fun(op)
3769OP *op;
3770{
3771 register OP *kid;
3772 OP **tokid;
3773 OP *sibl;
3774 I32 numargs = 0;
a0d0e21e
LW		 3775 int type = op->op_type;
3776 register I32 oa = opargs[type] >> OASHIFT;
79072805
LW		 3777
3778 if (op->op_flags & OPf_STACKED) {
3779 if ((oa & OA_OPTIONAL) && (oa >> 4) && !((oa >> 4) & OA_OPTIONAL))
3780 oa &= ~OA_OPTIONAL;
3781 else
3782 return no_fh_allowed(op);
3783 }
3784
3785 if (op->op_flags & OPf_KIDS) {
3786 tokid = &cLISTOP->op_first;
3787 kid = cLISTOP->op_first;
8990e307
LW		 3788 if (kid->op_type == OP_PUSHMARK ||
3789 kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK)
3790 {
79072805
LW		 3791 tokid = &kid->op_sibling;
3792 kid = kid->op_sibling;
3793 }
a0d0e21e
LW		 3794 if (!kid && opargs[type] & OA_DEFGV)
3795 *tokid = kid = newSVREF(newGVOP(OP_GV, 0, defgv));
79072805
LW		 3796
3797 while (oa && kid) {
3798 numargs++;
3799 sibl = kid->op_sibling;
3800 switch (oa & 7) {
3801 case OA_SCALAR:
3802 scalar(kid);
3803 break;
3804 case OA_LIST:
3805 if (oa < 16) {
3806 kid = 0;
3807 continue;
3808 }
3809 else
3810 list(kid);
3811 break;
3812 case OA_AVREF:
3813 if (kid->op_type == OP_CONST &&
3814 (kid->op_private & OPpCONST_BARE)) {
463ee0b2 3815 char *name = SvPVx(((SVOP*)kid)->op_sv, na);
79072805 3816 OP *newop = newAVREF(newGVOP(OP_GV, 0,
85e6fe83 3817 gv_fetchpv(name, TRUE, SVt_PVAV) ));
463ee0b2 3818 if (dowarn)
ff0cee69 3819 warn("Array @%s missing the @ in argument %ld of %s()",
3820 name, (long)numargs, op_desc[type]);
79072805
LW		 3821 op_free(kid);
3822 kid = newop;
3823 kid->op_sibling = sibl;
3824 *tokid = kid;
3825 }
8990e307 3826 else if (kid->op_type != OP_RV2AV && kid->op_type != OP_PADAV)
c07a80fd 3827 bad_type(numargs, "array", op_desc[op->op_type], kid);
a0d0e21e 3828 mod(kid, type);
79072805
LW		 3829 break;
3830 case OA_HVREF:
3831 if (kid->op_type == OP_CONST &&
3832 (kid->op_private & OPpCONST_BARE)) {
463ee0b2 3833 char *name = SvPVx(((SVOP*)kid)->op_sv, na);
79072805 3834 OP *newop = newHVREF(newGVOP(OP_GV, 0,
85e6fe83 3835 gv_fetchpv(name, TRUE, SVt_PVHV) ));
463ee0b2 3836 if (dowarn)
ff0cee69 3837 warn("Hash %%%s missing the %% in argument %ld of %s()",
3838 name, (long)numargs, op_desc[type]);
79072805
LW		 3839 op_free(kid);
3840 kid = newop;
3841 kid->op_sibling = sibl;
3842 *tokid = kid;
3843 }
8990e307 3844 else if (kid->op_type != OP_RV2HV && kid->op_type != OP_PADHV)
c07a80fd 3845 bad_type(numargs, "hash", op_desc[op->op_type], kid);
a0d0e21e 3846 mod(kid, type);
79072805
LW		 3847 break;
3848 case OA_CVREF:
3849 {
a0d0e21e 3850 OP *newop = newUNOP(OP_NULL, 0, kid);
79072805
LW		 3851 kid->op_sibling = 0;
3852 linklist(kid);
3853 newop->op_next = newop;
3854 kid = newop;
3855 kid->op_sibling = sibl;
3856 *tokid = kid;
3857 }
3858 break;
3859 case OA_FILEREF:
3860 if (kid->op_type != OP_GV) {
3861 if (kid->op_type == OP_CONST &&
3862 (kid->op_private & OPpCONST_BARE)) {
3863 OP *newop = newGVOP(OP_GV, 0,
85e6fe83
LW		 3864 gv_fetchpv(SvPVx(((SVOP*)kid)->op_sv, na), TRUE,
3865 SVt_PVIO) );
79072805
LW		 3866 op_free(kid);
3867 kid = newop;
3868 }
3869 else {
3870 kid->op_sibling = 0;
3871 kid = newUNOP(OP_RV2GV, 0, scalar(kid));
3872 }
3873 kid->op_sibling = sibl;
3874 *tokid = kid;
3875 }
3876 scalar(kid);
3877 break;
3878 case OA_SCALARREF:
a0d0e21e 3879 mod(scalar(kid), type);
79072805
LW		 3880 break;
3881 }
3882 oa >>= 4;
3883 tokid = &kid->op_sibling;
3884 kid = kid->op_sibling;
3885 }
c07a80fd 3886 op->op_private |= numargs;
79072805 3887 if (kid)
c07a80fd 3888 return too_many_arguments(op,op_desc[op->op_type]);
79072805
LW		 3889 listkids(op);
3890 }
a0d0e21e
LW		 3891 else if (opargs[type] & OA_DEFGV) {
3892 op_free(op);
3893 return newUNOP(type, 0, newSVREF(newGVOP(OP_GV, 0, defgv)));
3894 }
3895
79072805
LW		 3896 if (oa) {
3897 while (oa & OA_OPTIONAL)
3898 oa >>= 4;
3899 if (oa && oa != OA_LIST)
c07a80fd 3900 return too_few_arguments(op,op_desc[op->op_type]);
79072805
LW		 3901 }
3902 return op;
3903}
3904
3905OP *
3906ck_glob(op)
3907OP *op;
3908{
b1cb66bf 3909 GV *gv = gv_fetchpv("glob", FALSE, SVt_PVCV);
3910
3911 if (gv && GvIMPORTED_CV(gv)) {
3912 op->op_type = OP_LIST;
3913 op->op_ppaddr = ppaddr[OP_LIST];
3914 op = newUNOP(OP_ENTERSUB, OPf_STACKED,
3915 append_elem(OP_LIST, op,
3916 scalar(newUNOP(OP_RV2CV, 0,
3917 newGVOP(OP_GV, 0, gv)))));
3918 return ck_subr(op);
3919 }
0a753a76 3920 if ((op->op_flags & OPf_KIDS) && !cLISTOP->op_first->op_sibling)
3921 append_elem(OP_GLOB, op, newSVREF(newGVOP(OP_GV, 0, defgv)));
b1cb66bf 3922 gv = newGVgen("main");
a0d0e21e 3923 gv_IOadd(gv);
79072805
LW		 3924 append_elem(OP_GLOB, op, newGVOP(OP_GV, 0, gv));
3925 scalarkids(op);
a0d0e21e 3926 return ck_fun(op);
79072805
LW		 3927}
3928
3929OP *
3930ck_grep(op)
3931OP *op;
3932{
3933 LOGOP *gwop;
3934 OP *kid;
a0d0e21e 3935 OPCODE type = op->op_type == OP_GREPSTART ? OP_GREPWHILE : OP_MAPWHILE;
79072805 3936
a0d0e21e
LW		 3937 op->op_ppaddr = ppaddr[OP_GREPSTART];
3938 Newz(1101, gwop, 1, LOGOP);
3939
93a17b20 3940 if (op->op_flags & OPf_STACKED) {
a0d0e21e 3941 OP* k;
93a17b20 3942 op = ck_sort(op);
8e07c86e 3943 kid = cLISTOP->op_first->op_sibling;
a0d0e21e
LW		 3944 for (k = cLISTOP->op_first->op_sibling->op_next; k; k = k->op_next) {
3945 kid = k;
3946 }
3947 kid->op_next = (OP*)gwop;
93a17b20
LW		 3948 op->op_flags &= ~OPf_STACKED;
3949 }
a0d0e21e
LW		 3950 kid = cLISTOP->op_first->op_sibling;
3951 if (type == OP_MAPWHILE)
3952 list(kid);
3953 else
3954 scalar(kid);
79072805
LW		 3955 op = ck_fun(op);
3956 if (error_count)
3957 return op;
a0d0e21e 3958 kid = cLISTOP->op_first->op_sibling;
79072805 3959 if (kid->op_type != OP_NULL)
463ee0b2 3960 croak("panic: ck_grep");
79072805
LW		 3961 kid = kUNOP->op_first;
3962
a0d0e21e
LW		 3963 gwop->op_type = type;
3964 gwop->op_ppaddr = ppaddr[type];
3965 gwop->op_first = listkids(op);
79072805
LW		 3966 gwop->op_flags |= OPf_KIDS;
3967 gwop->op_private = 1;
3968 gwop->op_other = LINKLIST(kid);
a0d0e21e 3969 gwop->op_targ = pad_alloc(type, SVs_PADTMP);
79072805
LW		 3970 kid->op_next = (OP*)gwop;
3971
a0d0e21e
LW		 3972 kid = cLISTOP->op_first->op_sibling;
3973 if (!kid || !kid->op_sibling)
c07a80fd 3974 return too_few_arguments(op,op_desc[op->op_type]);
a0d0e21e
LW		 3975 for (kid = kid->op_sibling; kid; kid = kid->op_sibling)
3976 mod(kid, OP_GREPSTART);
3977
79072805
LW		 3978 return (OP*)gwop;
3979}
3980
3981OP *
3982ck_index(op)
3983OP *op;
3984{
3985 if (op->op_flags & OPf_KIDS) {
3986 OP *kid = cLISTOP->op_first->op_sibling; /* get past pushmark */
3987 if (kid && kid->op_type == OP_CONST)
bbce6d69 3988 fbm_compile(((SVOP*)kid)->op_sv);
79072805
LW		 3989 }
3990 return ck_fun(op);
3991}
3992
3993OP *
3994ck_lengthconst(op)
3995OP *op;
3996{
3997 /* XXX length optimization goes here */
a0d0e21e 3998 return ck_fun(op);
79072805
LW		 3999}
4000
4001OP *
4002ck_lfun(op)
4003OP *op;
4004{
8ebc5c01 4005 OPCODE type = op->op_type;
4006 return modkids(ck_fun(op), type);
79072805
LW		 4007}
4008
4009OP *
8990e307
LW		 4010ck_rfun(op)
4011OP *op;
4012{
8ebc5c01 4013 OPCODE type = op->op_type;
4014 return refkids(ck_fun(op), type);
8990e307
LW		 4015}
4016
4017OP *
79072805
LW		 4018ck_listiob(op)
4019OP *op;
4020{
4021 register OP *kid;
4022
4023 kid = cLISTOP->op_first;
4024 if (!kid) {
8990e307 4025 op = force_list(op);
79072805
LW		 4026 kid = cLISTOP->op_first;
4027 }
4028 if (kid->op_type == OP_PUSHMARK)
4029 kid = kid->op_sibling;
4030 if (kid && op->op_flags & OPf_STACKED)
4031 kid = kid->op_sibling;
4032 else if (kid && !kid->op_sibling) { /* print HANDLE; */
4033 if (kid->op_type == OP_CONST && kid->op_private & OPpCONST_BARE) {
4034 op->op_flags |= OPf_STACKED; /* make it a filehandle */
748a9306 4035 kid = newUNOP(OP_RV2GV, OPf_REF, scalar(kid));
79072805
LW		 4036 cLISTOP->op_first->op_sibling = kid;
4037 cLISTOP->op_last = kid;
4038 kid = kid->op_sibling;
4039 }
4040 }
4041
4042 if (!kid)
4043 append_elem(op->op_type, op, newSVREF(newGVOP(OP_GV, 0, defgv)) );
4044
bbce6d69 4045 op = listkids(op);
4046
4047 op->op_private = 0;
36477c24 4048#ifdef USE_LOCALE
bbce6d69 4049 if (hints & HINT_LOCALE)
4050 op->op_private |= OPpLOCALE;
4051#endif
4052
4053 return op;
4054}
4055
4056OP *
4057ck_fun_locale(op)
4058OP *op;
4059{
4060 op = ck_fun(op);
4061
4062 op->op_private = 0;
36477c24 4063#ifdef USE_LOCALE
bbce6d69 4064 if (hints & HINT_LOCALE)
4065 op->op_private |= OPpLOCALE;
4066#endif
4067
4068 return op;
4069}
4070
4071OP *
4072ck_scmp(op)
4073OP *op;
4074{
4075 op->op_private = 0;
36477c24 4076#ifdef USE_LOCALE
bbce6d69 4077 if (hints & HINT_LOCALE)
4078 op->op_private |= OPpLOCALE;
4079#endif
36477c24 4080
bbce6d69 4081 return op;
79072805
LW		 4082}
4083
4084OP *
4085ck_match(op)
4086OP *op;
4087{
4088 cPMOP->op_pmflags |= PMf_RUNTIME;
4633a7c4 4089 cPMOP->op_pmpermflags |= PMf_RUNTIME;
79072805
LW		 4090 return op;
4091}
4092
4093OP *
4094ck_null(op)
4095OP *op;
4096{
4097 return op;
4098}
4099
4100OP *
4101ck_repeat(op)
4102OP *op;
4103{
4104 if (cBINOP->op_first->op_flags & OPf_PARENS) {
c07a80fd 4105 op->op_private |= OPpREPEAT_DOLIST;
8990e307 4106 cBINOP->op_first = force_list(cBINOP->op_first);
79072805
LW		 4107 }
4108 else
4109 scalar(op);
4110 return op;
4111}
4112
4113OP *
8990e307
LW		 4114ck_require(op)
4115OP *op;
4116{
a0d0e21e 4117 if (op->op_flags & OPf_KIDS) { /* Shall we supply missing .pm? */
8990e307
LW		 4118 SVOP *kid = (SVOP*)cUNOP->op_first;
4119
4120 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
8990e307 4121 char *s;
a0d0e21e
LW		 4122 for (s = SvPVX(kid->op_sv); *s; s++) {
4123 if (*s == ':' && s[1] == ':') {
4124 *s = '/';
1aef975c 4125 Move(s+2, s+1, strlen(s+2)+1, char);
a0d0e21e
LW		 4126 --SvCUR(kid->op_sv);
4127 }
8990e307 4128 }
a0d0e21e 4129 sv_catpvn(kid->op_sv, ".pm", 3);
8990e307
LW		 4130 }
4131 }
4132 return ck_fun(op);
4133}
4134
4135OP *
79072805
LW		 4136ck_retarget(op)
4137OP *op;
4138{
463ee0b2 4139 croak("NOT IMPL LINE %d",__LINE__);
79072805
LW		 4140 /* STUB */
4141 return op;
4142}
4143
4144OP *
4145ck_select(op)
4146OP *op;
4147{
c07a80fd 4148 OP* kid;
79072805 4149 if (op->op_flags & OPf_KIDS) {
c07a80fd 4150 kid = cLISTOP->op_first->op_sibling; /* get past pushmark */
2304df62 4151 if (kid && kid->op_sibling) {
79072805
LW		 4152 op->op_type = OP_SSELECT;
4153 op->op_ppaddr = ppaddr[OP_SSELECT];
4154 op = ck_fun(op);
4155 return fold_constants(op);
4156 }
4157 }
c07a80fd 4158 op = ck_fun(op);
4159 kid = cLISTOP->op_first->op_sibling; /* get past pushmark */
4160 if (kid && kid->op_type == OP_RV2GV)
4161 kid->op_private &= ~HINT_STRICT_REFS;
4162 return op;
79072805
LW		 4163}
4164
4165OP *
4166ck_shift(op)
4167OP *op;
4168{
4169 I32 type = op->op_type;
4170
4171 if (!(op->op_flags & OPf_KIDS)) {
4172 op_free(op);
4173 return newUNOP(type, 0,
4174 scalar(newUNOP(OP_RV2AV, 0,
b1cb66bf 4175 scalar(newGVOP(OP_GV, 0, subline
4176 ? defgv
4177 : gv_fetchpv("ARGV", TRUE, SVt_PVAV) )))));
79072805 4178 }
463ee0b2 4179 return scalar(modkids(ck_fun(op), type));
79072805
LW		 4180}
4181
4182OP *
4183ck_sort(op)
4184OP *op;
4185{
bbce6d69 4186 op->op_private = 0;
36477c24 4187#ifdef USE_LOCALE
bbce6d69 4188 if (hints & HINT_LOCALE)
4189 op->op_private |= OPpLOCALE;
4190#endif
4191
79072805
LW		 4192 if (op->op_flags & OPf_STACKED) {
4193 OP *kid = cLISTOP->op_first->op_sibling; /* get past pushmark */
463ee0b2
LW		 4194 OP *k;
4195 kid = kUNOP->op_first; /* get past rv2gv */
79072805 4196
463ee0b2 4197 if (kid->op_type == OP_SCOPE || kid->op_type == OP_LEAVE) {
79072805 4198 linklist(kid);
463ee0b2
LW		 4199 if (kid->op_type == OP_SCOPE) {
4200 k = kid->op_next;
4201 kid->op_next = 0;
79072805 4202 }
463ee0b2 4203 else if (kid->op_type == OP_LEAVE) {
748a9306
LW		 4204 if (op->op_type == OP_SORT) {
4205 null(kid); /* wipe out leave */
4206 kid->op_next = kid;
463ee0b2 4207
748a9306
LW		 4208 for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
4209 if (k->op_next == kid)
4210 k->op_next = 0;
4211 }
463ee0b2 4212 }
748a9306
LW		 4213 else
4214 kid->op_next = 0; /* just disconnect the leave */
a0d0e21e 4215 k = kLISTOP->op_first;
463ee0b2 4216 }
a0d0e21e
LW		 4217 peep(k);
4218
463ee0b2 4219 kid = cLISTOP->op_first->op_sibling; /* get past pushmark */
8990e307 4220 null(kid); /* wipe out rv2gv */
a0d0e21e
LW		 4221 if (op->op_type == OP_SORT)
4222 kid->op_next = kid;
4223 else
4224 kid->op_next = k;
79072805
LW		 4225 op->op_flags |= OPf_SPECIAL;
4226 }
4227 }
bbce6d69 4228
79072805
LW		 4229 return op;
4230}
4231
4232OP *
4233ck_split(op)
4234OP *op;
4235{
4236 register OP *kid;
ed6116ce 4237 PMOP* pm;
79072805
LW		 4238
4239 if (op->op_flags & OPf_STACKED)
4240 return no_fh_allowed(op);
4241
79072805 4242 kid = cLISTOP->op_first;
8990e307 4243 if (kid->op_type != OP_NULL)
463ee0b2 4244 croak("panic: ck_split");
8990e307
LW		 4245 kid = kid->op_sibling;
4246 op_free(cLISTOP->op_first);
4247 cLISTOP->op_first = kid;
85e6fe83 4248 if (!kid) {
8990e307 4249 cLISTOP->op_first = kid = newSVOP(OP_CONST, 0, newSVpv(" ", 1));
85e6fe83
LW		 4250 cLISTOP->op_last = kid; /* There was only one element previously */
4251 }
79072805
LW		 4252
4253 if (kid->op_type != OP_MATCH) {
4254 OP *sibl = kid->op_sibling;
463ee0b2 4255 kid->op_sibling = 0;
79072805
LW		 4256 kid = pmruntime( newPMOP(OP_MATCH, OPf_SPECIAL), kid, Nullop);
4257 if (cLISTOP->op_first == cLISTOP->op_last)
4258 cLISTOP->op_last = kid;
4259 cLISTOP->op_first = kid;
4260 kid->op_sibling = sibl;
4261 }
ed6116ce
LW		 4262 pm = (PMOP*)kid;
4263 if (pm->op_pmshort && !(pm->op_pmflags & PMf_ALL)) {
8990e307 4264 SvREFCNT_dec(pm->op_pmshort); /* can't use substring to optimize */
ed6116ce
LW		 4265 pm->op_pmshort = 0;
4266 }
79072805
LW		 4267
4268 kid->op_type = OP_PUSHRE;
4269 kid->op_ppaddr = ppaddr[OP_PUSHRE];
4270 scalar(kid);
4271
4272 if (!kid->op_sibling)
4273 append_elem(OP_SPLIT, op, newSVREF(newGVOP(OP_GV, 0, defgv)) );
4274
4275 kid = kid->op_sibling;
4276 scalar(kid);
4277
4278 if (!kid->op_sibling)
4279 append_elem(OP_SPLIT, op, newSVOP(OP_CONST, 0, newSViv(0)));
4280
4281 kid = kid->op_sibling;
4282 scalar(kid);
4283
4284 if (kid->op_sibling)
c07a80fd 4285 return too_many_arguments(op,op_desc[op->op_type]);
79072805
LW		 4286
4287 return op;
4288}
4289
4290OP *
4291ck_subr(op)
4292OP *op;
4293{
4633a7c4
LW		 4294 OP *prev = ((cUNOP->op_first->op_sibling)
4295 ? cUNOP : ((UNOP*)cUNOP->op_first))->op_first;
4296 OP *o = prev->op_sibling;
4297 OP *cvop;
4298 char *proto = 0;
4299 CV *cv = 0;
4300 int optional = 0;
4301 I32 arg = 0;
4302
4303 for (cvop = o; cvop->op_sibling; cvop = cvop->op_sibling) ;
4304 if (cvop->op_type == OP_RV2CV) {
4305 SVOP* tmpop;
c07a80fd 4306 op->op_private |= (cvop->op_private & OPpENTERSUB_AMPER);
4633a7c4
LW		 4307 null(cvop); /* disable rv2cv */
4308 tmpop = (SVOP*)((UNOP*)cvop)->op_first;
4309 if (tmpop->op_type == OP_GV) {
8ebc5c01 4310 cv = GvCVu(tmpop->op_sv);
c07a80fd 4311 if (cv && SvPOK(cv) && !(op->op_private & OPpENTERSUB_AMPER))
4633a7c4
LW		 4312 proto = SvPV((SV*)cv,na);
4313 }
4314 }
c07a80fd 4315 op->op_private |= (hints & HINT_STRICT_REFS);
8990e307 4316 if (perldb && curstash != debstash)
c07a80fd 4317 op->op_private |= OPpENTERSUB_DB;
4633a7c4
LW		 4318 while (o != cvop) {
4319 if (proto) {
4320 switch (*proto) {
4321 case '\0':
4322 return too_many_arguments(op, CvNAME(cv));
4323 case ';':
4324 optional = 1;
4325 proto++;
4326 continue;
4327 case '$':
4328 proto++;
4329 arg++;
4330 scalar(o);
4331 break;
4332 case '%':
4333 case '@':
4334 list(o);
4335 arg++;
4336 break;
4337 case '&':
4338 proto++;
4339 arg++;
4340 if (o->op_type != OP_REFGEN && o->op_type != OP_UNDEF)
4341 bad_type(arg, "block", CvNAME(cv), o);
4342 break;
4343 case '*':
4344 proto++;
4345 arg++;
4346 if (o->op_type == OP_RV2GV)
4347 goto wrapref;
4348 {
4349 OP* kid = o;
4350 o = newUNOP(OP_RV2GV, 0, kid);
4351 o->op_sibling = kid->op_sibling;
4352 kid->op_sibling = 0;
4353 prev->op_sibling = o;
4354 }
4355 goto wrapref;
4356 case '\\':
4357 proto++;
4358 arg++;
4359 switch (*proto++) {
4360 case '*':
4361 if (o->op_type != OP_RV2GV)
4362 bad_type(arg, "symbol", CvNAME(cv), o);
4363 goto wrapref;
4364 case '&':
4365 if (o->op_type != OP_RV2CV)
4366 bad_type(arg, "sub", CvNAME(cv), o);
4367 goto wrapref;
4368 case '$':
4369 if (o->op_type != OP_RV2SV && o->op_type != OP_PADSV)
4370 bad_type(arg, "scalar", CvNAME(cv), o);
4371 goto wrapref;
4372 case '@':
4373 if (o->op_type != OP_RV2AV && o->op_type != OP_PADAV)
4374 bad_type(arg, "array", CvNAME(cv), o);
4375 goto wrapref;
4376 case '%':
4377 if (o->op_type != OP_RV2HV && o->op_type != OP_PADHV)
4378 bad_type(arg, "hash", CvNAME(cv), o);
4379 wrapref:
4380 {
4381 OP* kid = o;
4382 o = newUNOP(OP_REFGEN, 0, kid);
4383 o->op_sibling = kid->op_sibling;
4384 kid->op_sibling = 0;
4385 prev->op_sibling = o;
4386 }
4387 break;
4388 default: goto oops;
4389 }
4390 break;
b1cb66bf 4391 case ' ':
4392 proto++;
4393 continue;
4633a7c4
LW		 4394 default:
4395 oops:
4396 croak("Malformed prototype for %s: %s",
4397 CvNAME(cv),SvPV((SV*)cv,na));
4398 }
4399 }
4400 else
4401 list(o);
a0d0e21e 4402 mod(o, OP_ENTERSUB);
4633a7c4
LW		 4403 prev = o;
4404 o = o->op_sibling;
4405 }
4406 if (proto && !optional && *proto == '$')
4407 return too_few_arguments(op, CvNAME(cv));
79072805
LW		 4408 return op;
4409}
4410
4411OP *
8990e307
LW		 4412ck_svconst(op)
4413OP *op;
4414{
4415 SvREADONLY_on(cSVOP->op_sv);
4416 return op;
4417}
4418
4419OP *
79072805
LW		 4420ck_trunc(op)
4421OP *op;
4422{
4423 if (op->op_flags & OPf_KIDS) {
4424 SVOP *kid = (SVOP*)cUNOP->op_first;
4425
a0d0e21e
LW		 4426 if (kid->op_type == OP_NULL)
4427 kid = (SVOP*)kid->op_sibling;
4428 if (kid &&
4429 kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE))
79072805
LW		 4430 op->op_flags |= OPf_SPECIAL;
4431 }
4432 return ck_fun(op);
4433}
4434
463ee0b2
LW		 4435/* A peephole optimizer. We visit the ops in the order they're to execute. */
4436
79072805 4437void
a0d0e21e
LW		 4438peep(o)
4439register OP* o;
79072805
LW		 4440{
4441 register OP* oldop = 0;
a0d0e21e 4442 if (!o || o->op_seq)
79072805 4443 return;
a0d0e21e
LW		 4444 ENTER;
4445 SAVESPTR(op);
4446 SAVESPTR(curcop);
4447 for (; o; o = o->op_next) {
4448 if (o->op_seq)
4449 break;
c07a80fd 4450 if (!op_seqmax)
4451 op_seqmax++;
a0d0e21e
LW		 4452 op = o;
4453 switch (o->op_type) {
4454 case OP_NEXTSTATE:
4455 case OP_DBSTATE:
4456 curcop = ((COP*)o); /* for warnings */
c07a80fd 4457 o->op_seq = op_seqmax++;
a0d0e21e
LW		 4458 break;
4459
4460 case OP_CONCAT:
4461 case OP_CONST:
4462 case OP_JOIN:
4463 case OP_UC:
4464 case OP_UCFIRST:
4465 case OP_LC:
4466 case OP_LCFIRST:
4467 case OP_QUOTEMETA:
4468 if (o->op_next->op_type == OP_STRINGIFY)
4469 null(o->op_next);
c07a80fd 4470 o->op_seq = op_seqmax++;
a0d0e21e 4471 break;
8990e307 4472 case OP_STUB:
a0d0e21e 4473 if ((o->op_flags & (OPf_KNOW|OPf_LIST)) != (OPf_KNOW|OPf_LIST)) {
c07a80fd 4474 o->op_seq = op_seqmax++;
8990e307
LW		 4475 break; /* Scalar stub must produce undef. List stub is noop */
4476 }
748a9306 4477 goto nothin;
79072805 4478 case OP_NULL:
748a9306
LW		 4479 if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
4480 curcop = ((COP*)op);
4481 goto nothin;
79072805 4482 case OP_SCALAR:
93a17b20 4483 case OP_LINESEQ:
463ee0b2 4484 case OP_SCOPE:
748a9306 4485 nothin:
a0d0e21e
LW		 4486 if (oldop && o->op_next) {
4487 oldop->op_next = o->op_next;
79072805
LW		 4488 continue;
4489 }
c07a80fd 4490 o->op_seq = op_seqmax++;
79072805
LW		 4491 break;
4492
4493 case OP_GV:
a0d0e21e 4494 if (o->op_next->op_type == OP_RV2SV) {
5f05dabc 4495 if (!(o->op_next->op_private & OPpDEREF)) {
a0d0e21e
LW		 4496 null(o->op_next);
4497 o->op_private |= o->op_next->op_private & OPpLVAL_INTRO;
4498 o->op_next = o->op_next->op_next;
4499 o->op_type = OP_GVSV;
4500 o->op_ppaddr = ppaddr[OP_GVSV];
8990e307
LW		 4501 }
4502 }
a0d0e21e
LW		 4503 else if (o->op_next->op_type == OP_RV2AV) {
4504 OP* pop = o->op_next->op_next;
4505 IV i;
8990e307 4506 if (pop->op_type == OP_CONST &&
a0d0e21e 4507 (op = pop->op_next) &&
8990e307 4508 pop->op_next->op_type == OP_AELEM &&
5f05dabc 4509 !(pop->op_next->op_private & (OPpDEREF|OPpLVAL_INTRO)) &&
a0d0e21e
LW		 4510 (i = SvIV(((SVOP*)pop)->op_sv) - compiling.cop_arybase)
4511 <= 255 &&
8990e307
LW		 4512 i >= 0)
4513 {
748a9306 4514 SvREFCNT_dec(((SVOP*)pop)->op_sv);
a0d0e21e 4515 null(o->op_next);
8990e307
LW		 4516 null(pop->op_next);
4517 null(pop);
a0d0e21e
LW		 4518 o->op_flags |= pop->op_next->op_flags & OPf_MOD;
4519 o->op_next = pop->op_next->op_next;
4520 o->op_type = OP_AELEMFAST;
4521 o->op_ppaddr = ppaddr[OP_AELEMFAST];
4522 o->op_private = (U8)i;
a6006777 4523 GvAVn(((GVOP*)o)->op_gv);
8990e307 4524 }
79072805 4525 }
c07a80fd 4526 o->op_seq = op_seqmax++;
79072805
LW		 4527 break;
4528
a0d0e21e 4529 case OP_MAPWHILE:
79072805
LW		 4530 case OP_GREPWHILE:
4531 case OP_AND:
4532 case OP_OR:
c07a80fd 4533 o->op_seq = op_seqmax++;
79072805
LW		 4534 peep(cLOGOP->op_other);
4535 break;
4536
4537 case OP_COND_EXPR:
c07a80fd 4538 o->op_seq = op_seqmax++;
79072805
LW		 4539 peep(cCONDOP->op_true);
4540 peep(cCONDOP->op_false);
4541 break;
4542
4543 case OP_ENTERLOOP:
c07a80fd 4544 o->op_seq = op_seqmax++;
79072805
LW		 4545 peep(cLOOP->op_redoop);
4546 peep(cLOOP->op_nextop);
4547 peep(cLOOP->op_lastop);
4548 break;
4549
4550 case OP_MATCH:
4551 case OP_SUBST:
c07a80fd 4552 o->op_seq = op_seqmax++;
a0d0e21e 4553 peep(cPMOP->op_pmreplstart);
79072805
LW		 4554 break;
4555
a0d0e21e 4556 case OP_EXEC:
c07a80fd 4557 o->op_seq = op_seqmax++;
a0d0e21e
LW		 4558 if (dowarn && o->op_next && o->op_next->op_type == OP_NEXTSTATE) {
4559 if (o->op_next->op_sibling &&
4560 o->op_next->op_sibling->op_type != OP_DIE) {
4561 line_t oldline = curcop->cop_line;
4562
4563 curcop->cop_line = ((COP*)o->op_next)->cop_line;
4564 warn("Statement unlikely to be reached");
4565 warn("(Maybe you meant system() when you said exec()?)\n");
4566 curcop->cop_line = oldline;
4567 }
4568 }
4569 break;
79072805 4570 default:
c07a80fd 4571 o->op_seq = op_seqmax++;
79072805
LW		 4572 break;
4573 }
a0d0e21e 4574 oldop = o;
79072805 4575 }
a0d0e21e 4576 LEAVE;
79072805 4577}
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