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[perl5.git] / op.c
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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
e50aee73 21/*
5dc0d613 22 * In the following definition, the ", Nullop" is just to make the compiler
a5f75d66 23 * think the expression is of the right type: croak actually does a Siglongjmp.
e50aee73 24 */
11343788 25#define CHECKOP(type,o) \
28757baa 26 ((op_mask && op_mask[type]) \
5dc0d613 27 ? ( op_free((OP*)o), \
28757baa 28 croak("%s trapped by operation mask", op_desc[type]), \
29 Nullop ) \
11343788 30 : (*check[type])((OP*)o))
e50aee73 31
11343788 32static I32 list_assignment _((OP *o));
3bc5dc61 33static void bad_type _((I32 n, char *t, char *name, OP *kid));
11343788
MB		 34static OP *modkids _((OP *o, I32 type));
35static OP *no_fh_allowed _((OP *o));
5dc0d613 36static bool scalar_mod_type _((OP *o, I32 type));
11343788
MB		 37static OP *scalarboolean _((OP *o));
38static OP *too_few_arguments _((OP *o, char* name));
39static OP *too_many_arguments _((OP *o, char* name));
40static void null _((OP* o));
bbce6d69 41static PADOFFSET pad_findlex _((char* name, PADOFFSET newoff, U32 seq,
748a9306 42 CV* startcv, I32 cx_ix));
54b9620d 43static OP *newDEFSVOP _((void));
79072805 44
4633a7c4 45static char*
8ac85365 46gv_ename(GV *gv)
4633a7c4
LW		 47{
48 SV* tmpsv = sv_newmortal();
46fc3d4c 49 gv_efullname3(tmpsv, gv, Nullch);
4633a7c4
LW		 50 return SvPV(tmpsv,na);
51}
52
8990e307 53static OP *
8ac85365 54no_fh_allowed(OP *o)
79072805 55{
46fc3d4c 56 yyerror(form("Missing comma after first argument to %s function",
5196be3e 57 op_desc[o->op_type]));
11343788 58 return o;
79072805
LW		 59}
60
8990e307 61static OP *
8ac85365 62too_few_arguments(OP *o, char *name)
79072805 63{
46fc3d4c 64 yyerror(form("Not enough arguments for %s", name));
11343788 65 return o;
79072805
LW		 66}
67
8990e307 68static OP *
8ac85365 69too_many_arguments(OP *o, char *name)
79072805 70{
46fc3d4c 71 yyerror(form("Too many arguments for %s", name));
11343788 72 return o;
79072805
LW		 73}
74
3bc5dc61 75static void
8ac85365 76bad_type(I32 n, char *t, char *name, OP *kid)
8990e307 77{
46fc3d4c 78 yyerror(form("Type of arg %d to %s must be %s (not %s)",
79 (int)n, name, t, op_desc[kid->op_type]));
8990e307
LW		 80}
81
a0d0e21e 82void
8ac85365 83assertref(OP *o)
a0d0e21e 84{
11343788 85 int type = o->op_type;
a0d0e21e 86 if (type != OP_AELEM && type != OP_HELEM) {
46fc3d4c 87 yyerror(form("Can't use subscript on %s", op_desc[type]));
8ebc5c01 88 if (type == OP_ENTERSUB || type == OP_RV2HV || type == OP_PADHV)
748a9306 89 warn("(Did you mean $ or @ instead of %c?)\n",
8ebc5c01 90 type == OP_ENTERSUB ? '&' : '%');
a0d0e21e
LW		 91 }
92}
93
79072805
LW		 94/* "register" allocation */
95
96PADOFFSET
8ac85365 97pad_allocmy(char *name)
93a17b20 98{
11343788 99 dTHR;
a0d0e21e
LW		 100 PADOFFSET off;
101 SV *sv;
102
103 if (!(isALPHA(name[1]) || name[1] == '_' && (int)strlen(name) > 2)) {
46fc3d4c 104 if (!isPRINT(name[1])) {
105 name[3] = '\0';
106 name[2] = toCTRL(name[1]);
107 name[1] = '^';
108 }
a0d0e21e
LW		 109 croak("Can't use global %s in \"my\"",name);
110 }
93965878 111 if (dowarn && AvFILLp(comppad_name) >= 0) {
b1cb66bf 112 SV **svp = AvARRAY(comppad_name);
93965878 113 for (off = AvFILLp(comppad_name); off > comppad_name_floor; off--) {
b1cb66bf 114 if ((sv = svp[off])
115 && sv != &sv_undef
116 && SvIVX(sv) == 999999999 /* var is in open scope */
117 && strEQ(name, SvPVX(sv)))
118 {
119 warn("\"my\" variable %s masks earlier declaration in same scope", name);
120 break;
121 }
122 }
123 }
a0d0e21e
LW		 124 off = pad_alloc(OP_PADSV, SVs_PADMY);
125 sv = NEWSV(1102,0);
93a17b20
LW		 126 sv_upgrade(sv, SVt_PVNV);
127 sv_setpv(sv, name);
c750a3ec
MB		 128 if (in_my_stash) {
129 if (*name != '$')
130 croak("Can't declare class for non-scalar %s in \"my\"",name);
131 SvOBJECT_on(sv);
132 (void)SvUPGRADE(sv, SVt_PVMG);
133 SvSTASH(sv) = (HV*)SvREFCNT_inc(in_my_stash);
134 sv_objcount++;
135 }
8990e307 136 av_store(comppad_name, off, sv);
748a9306 137 SvNVX(sv) = (double)999999999;
8990e307
LW		 138 SvIVX(sv) = 0; /* Not yet introduced--see newSTATEOP */
139 if (!min_intro_pending)
140 min_intro_pending = off;
141 max_intro_pending = off;
93a17b20 142 if (*name == '@')
463ee0b2 143 av_store(comppad, off, (SV*)newAV());
93a17b20 144 else if (*name == '%')
463ee0b2 145 av_store(comppad, off, (SV*)newHV());
ed6116ce 146 SvPADMY_on(curpad[off]);
93a17b20
LW		 147 return off;
148}
149
748a9306 150static PADOFFSET
e9a444f0 151#ifndef CAN_PROTOTYPE
748a9306 152pad_findlex(name, newoff, seq, startcv, cx_ix)
93a17b20 153char *name;
748a9306 154PADOFFSET newoff;
bbce6d69 155U32 seq;
748a9306
LW		 156CV* startcv;
157I32 cx_ix;
e9a444f0 158#else
bbce6d69 159pad_findlex(char *name, PADOFFSET newoff, U32 seq, CV* startcv, I32 cx_ix)
e9a444f0 160#endif
93a17b20 161{
11343788 162 dTHR;
748a9306 163 CV *cv;
93a17b20
LW		 164 I32 off;
165 SV *sv;
93a17b20 166 register I32 i;
c09156bb 167 register PERL_CONTEXT *cx;
a0d0e21e 168 int saweval;
93a17b20 169
748a9306 170 for (cv = startcv; cv; cv = CvOUTSIDE(cv)) {
4fdae800 171 AV *curlist = CvPADLIST(cv);
172 SV **svp = av_fetch(curlist, 0, FALSE);
748a9306 173 AV *curname;
4fdae800 174
748a9306 175 if (!svp || *svp == &sv_undef)
4633a7c4 176 continue;
748a9306
LW		 177 curname = (AV*)*svp;
178 svp = AvARRAY(curname);
93965878 179 for (off = AvFILLp(curname); off > 0; off--) {
748a9306
LW		 180 if ((sv = svp[off]) &&
181 sv != &sv_undef &&
182 seq <= SvIVX(sv) &&
13826f2c 183 seq > I_32(SvNVX(sv)) &&
748a9306
LW		 184 strEQ(SvPVX(sv), name))
185 {
5f05dabc 186 I32 depth;
187 AV *oldpad;
188 SV *oldsv;
189
190 depth = CvDEPTH(cv);
191 if (!depth) {
9607fc9c 192 if (newoff) {
193 if (SvFAKE(sv))
194 continue;
4fdae800 195 return 0; /* don't clone from inactive stack frame */
9607fc9c 196 }
5f05dabc 197 depth = 1;
198 }
199 oldpad = (AV*)*av_fetch(curlist, depth, FALSE);
200 oldsv = *av_fetch(oldpad, off, TRUE);
748a9306 201 if (!newoff) { /* Not a mere clone operation. */
9607fc9c 202 SV *namesv = NEWSV(1103,0);
748a9306 203 newoff = pad_alloc(OP_PADSV, SVs_PADMY);
9607fc9c 204 sv_upgrade(namesv, SVt_PVNV);
205 sv_setpv(namesv, name);
206 av_store(comppad_name, newoff, namesv);
207 SvNVX(namesv) = (double)curcop->cop_seq;
208 SvIVX(namesv) = 999999999; /* A ref, intro immediately */
209 SvFAKE_on(namesv); /* A ref, not a real var */
774d564b 210 if (CvANON(compcv) || SvTYPE(compcv) == SVt_PVFM) {
28757baa 211 /* "It's closures all the way down." */
212 CvCLONE_on(compcv);
54310121 213 if (cv == startcv) {
214 if (CvANON(compcv))
215 oldsv = Nullsv; /* no need to keep ref */
216 }
217 else {
28757baa 218 CV *bcv;
219 for (bcv = startcv;
220 bcv && bcv != cv && !CvCLONE(bcv);
221 bcv = CvOUTSIDE(bcv)) {
222 if (CvANON(bcv))
223 CvCLONE_on(bcv);
224 else {
774d564b 225 if (dowarn && !CvUNIQUE(cv))
44a8e56a 226 warn(
227 "Variable \"%s\" may be unavailable",
28757baa 228 name);
229 break;
230 }
231 }
232 }
233 }
44a8e56a 234 else if (!CvUNIQUE(compcv)) {
9607fc9c 235 if (dowarn && !SvFAKE(sv) && !CvUNIQUE(cv))
44a8e56a 236 warn("Variable \"%s\" will not stay shared", name);
5f05dabc 237 }
748a9306 238 }
199100c8 239 av_store(comppad, newoff, SvREFCNT_inc(oldsv));
748a9306
LW		 240 return newoff;
241 }
93a17b20
LW		 242 }
243 }
244
245 /* Nothing in current lexical context--try eval's context, if any.
246 * This is necessary to let the perldb get at lexically scoped variables.
247 * XXX This will also probably interact badly with eval tree caching.
248 */
249
a0d0e21e 250 saweval = 0;
748a9306 251 for (i = cx_ix; i >= 0; i--) {
93a17b20
LW		 252 cx = &cxstack[i];
253 switch (cx->cx_type) {
254 default:
748a9306
LW		 255 if (i == 0 && saweval) {
256 seq = cxstack[saweval].blk_oldcop->cop_seq;
257 return pad_findlex(name, newoff, seq, main_cv, 0);
258 }
93a17b20
LW		 259 break;
260 case CXt_EVAL:
44a8e56a 261 switch (cx->blk_eval.old_op_type) {
262 case OP_ENTEREVAL:
263 saweval = i;
264 break;
265 case OP_REQUIRE:
266 /* require must have its own scope */
267 return 0;
268 }
93a17b20
LW		 269 break;
270 case CXt_SUB:
271 if (!saweval)
272 return 0;
273 cv = cx->blk_sub.cv;
748a9306
LW		 274 if (debstash && CvSTASH(cv) == debstash) { /* ignore DB'* scope */
275 saweval = i; /* so we know where we were called from */
93a17b20 276 continue;
93a17b20 277 }
748a9306
LW		 278 seq = cxstack[saweval].blk_oldcop->cop_seq;
279 return pad_findlex(name, newoff, seq, cv, i-1);
93a17b20
LW		 280 }
281 }
282
748a9306
LW		 283 return 0;
284}
a0d0e21e 285
748a9306 286PADOFFSET
8ac85365 287pad_findmy(char *name)
748a9306 288{
11343788 289 dTHR;
748a9306 290 I32 off;
54310121 291 I32 pendoff = 0;
748a9306
LW		 292 SV *sv;
293 SV **svp = AvARRAY(comppad_name);
bbce6d69 294 U32 seq = cop_seqmax;
748a9306 295
11343788
MB		 296#ifdef USE_THREADS
297 /*
298 * Special case to get lexical (and hence per-thread) @_.
299 * XXX I need to find out how to tell at parse-time whether use
300 * of @_ should refer to a lexical (from a sub) or defgv (global
301 * scope and maybe weird sub-ish things like formats). See
302 * startsub in perly.y. It's possible that @_ could be lexical
303 * (at least from subs) even in non-threaded perl.
304 */
305 if (strEQ(name, "@_"))
306 return 0; /* success. (NOT_IN_PAD indicates failure) */
307#endif /* USE_THREADS */
308
748a9306 309 /* The one we're looking for is probably just before comppad_name_fill. */
93965878 310 for (off = AvFILLp(comppad_name); off > 0; off--) {
a0d0e21e
LW		 311 if ((sv = svp[off]) &&
312 sv != &sv_undef &&
54310121 313 (!SvIVX(sv) ||
314 (seq <= SvIVX(sv) &&
315 seq > I_32(SvNVX(sv)))) &&
a0d0e21e
LW		 316 strEQ(SvPVX(sv), name))
317 {
54310121 318 if (SvIVX(sv))
319 return (PADOFFSET)off;
320 pendoff = off; /* this pending def. will override import */
a0d0e21e
LW		 321 }
322 }
748a9306
LW		 323
324 /* See if it's in a nested scope */
325 off = pad_findlex(name, 0, seq, CvOUTSIDE(compcv), cxstack_ix);
54310121 326 if (off) {
327 /* If there is a pending local definition, this new alias must die */
328 if (pendoff)
329 SvIVX(AvARRAY(comppad_name)[off]) = seq;
11343788 330 return off; /* pad_findlex returns 0 for failure...*/
54310121 331 }
11343788 332 return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */
93a17b20
LW		 333}
334
335void
8ac85365 336pad_leavemy(I32 fill)
93a17b20
LW		 337{
338 I32 off;
8990e307 339 SV **svp = AvARRAY(comppad_name);
93a17b20 340 SV *sv;
8990e307
LW		 341 if (min_intro_pending && fill < min_intro_pending) {
342 for (off = max_intro_pending; off >= min_intro_pending; off--) {
a0d0e21e 343 if ((sv = svp[off]) && sv != &sv_undef)
8990e307
LW		 344 warn("%s never introduced", SvPVX(sv));
345 }
346 }
347 /* "Deintroduce" my variables that are leaving with this scope. */
93965878 348 for (off = AvFILLp(comppad_name); off > fill; off--) {
748a9306 349 if ((sv = svp[off]) && sv != &sv_undef && SvIVX(sv) == 999999999)
463ee0b2 350 SvIVX(sv) = cop_seqmax;
93a17b20
LW		 351 }
352}
353
354PADOFFSET
8ac85365 355pad_alloc(I32 optype, U32 tmptype)
79072805 356{
11343788 357 dTHR;
79072805
LW		 358 SV *sv;
359 I32 retval;
360
361 if (AvARRAY(comppad) != curpad)
463ee0b2 362 croak("panic: pad_alloc");
a0d0e21e
LW		 363 if (pad_reset_pending)
364 pad_reset();
ed6116ce 365 if (tmptype & SVs_PADMY) {
79072805 366 do {
93965878 367 sv = *av_fetch(comppad, AvFILLp(comppad) + 1, TRUE);
ed6116ce 368 } while (SvPADBUSY(sv)); /* need a fresh one */
93965878 369 retval = AvFILLp(comppad);
79072805
LW		 370 }
371 else {
bbce6d69 372 SV **names = AvARRAY(comppad_name);
93965878 373 SSize_t names_fill = AvFILLp(comppad_name);
bbce6d69 374 for (;;) {
375 /*
376 * "foreach" index vars temporarily become aliases to non-"my"
377 * values. Thus we must skip, not just pad values that are
378 * marked as current pad values, but also those with names.
379 */
380 if (++padix <= names_fill &&
381 (sv = names[padix]) && sv != &sv_undef)
382 continue;
383 sv = *av_fetch(comppad, padix, TRUE);
384 if (!(SvFLAGS(sv) & (SVs_PADTMP|SVs_PADMY)))
385 break;
386 }
79072805
LW		 387 retval = padix;
388 }
8990e307 389 SvFLAGS(sv) |= tmptype;
79072805 390 curpad = AvARRAY(comppad);
11343788 391#ifdef USE_THREADS
5dc0d613
MB		 392 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx alloc %ld for %s\n",
393 (unsigned long) thr, (unsigned long) curpad,
394 (long) retval, op_name[optype]));
11343788 395#else
5dc0d613
MB		 396 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad alloc %ld for %s\n",
397 (long) retval, op_name[optype]));
11343788 398#endif /* USE_THREADS */
79072805
LW		 399 return (PADOFFSET)retval;
400}
401
402SV *
a0d0e21e 403#ifndef CAN_PROTOTYPE
79072805
LW		 404pad_sv(po)
405PADOFFSET po;
8990e307
LW		 406#else
407pad_sv(PADOFFSET po)
a0d0e21e 408#endif /* CAN_PROTOTYPE */
79072805 409{
11343788
MB		 410 dTHR;
411#ifdef USE_THREADS
5dc0d613
MB		 412 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx sv %d\n",
413 (unsigned long) thr, (unsigned long) curpad, po));
11343788 414#else
79072805 415 if (!po)
463ee0b2 416 croak("panic: pad_sv po");
5dc0d613 417 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad sv %d\n", po));
11343788 418#endif /* USE_THREADS */
79072805
LW		 419 return curpad[po]; /* eventually we'll turn this into a macro */
420}
421
422void
a0d0e21e 423#ifndef CAN_PROTOTYPE
79072805
LW		 424pad_free(po)
425PADOFFSET po;
8990e307
LW		 426#else
427pad_free(PADOFFSET po)
a0d0e21e 428#endif /* CAN_PROTOTYPE */
79072805 429{
11343788 430 dTHR;
a0d0e21e
LW		 431 if (!curpad)
432 return;
79072805 433 if (AvARRAY(comppad) != curpad)
463ee0b2 434 croak("panic: pad_free curpad");
79072805 435 if (!po)
463ee0b2 436 croak("panic: pad_free po");
11343788 437#ifdef USE_THREADS
5dc0d613
MB		 438 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx free %d\n",
439 (unsigned long) thr, (unsigned long) curpad, po));
11343788 440#else
5dc0d613 441 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad free %d\n", po));
11343788 442#endif /* USE_THREADS */
a0d0e21e 443 if (curpad[po] && curpad[po] != &sv_undef)
ed6116ce 444 SvPADTMP_off(curpad[po]);
a0d0e21e 445 if ((I32)po < padix)
79072805
LW		 446 padix = po - 1;
447}
448
449void
a0d0e21e 450#ifndef CAN_PROTOTYPE
79072805
LW		 451pad_swipe(po)
452PADOFFSET po;
8990e307
LW		 453#else
454pad_swipe(PADOFFSET po)
a0d0e21e 455#endif /* CAN_PROTOTYPE */
79072805 456{
11343788 457 dTHR;
79072805 458 if (AvARRAY(comppad) != curpad)
463ee0b2 459 croak("panic: pad_swipe curpad");
79072805 460 if (!po)
463ee0b2 461 croak("panic: pad_swipe po");
11343788 462#ifdef USE_THREADS
5dc0d613
MB		 463 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx swipe %d\n",
464 (unsigned long) thr, (unsigned long) curpad, po));
11343788 465#else
5dc0d613 466 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad swipe %d\n", po));
11343788 467#endif /* USE_THREADS */
ed6116ce 468 SvPADTMP_off(curpad[po]);
a0d0e21e
LW		 469 curpad[po] = NEWSV(1107,0);
470 SvPADTMP_on(curpad[po]);
471 if ((I32)po < padix)
79072805
LW		 472 padix = po - 1;
473}
474
475void
8ac85365 476pad_reset(void)
79072805 477{
11343788 478 dTHR;
79072805
LW		 479 register I32 po;
480
481 if (AvARRAY(comppad) != curpad)
463ee0b2 482 croak("panic: pad_reset curpad");
11343788 483#ifdef USE_THREADS
5dc0d613
MB		 484 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx reset\n",
485 (unsigned long) thr, (unsigned long) curpad));
11343788 486#else
760ac839 487 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad reset\n"));
11343788 488#endif /* USE_THREADS */
748a9306
LW		 489 if (!tainting) { /* Can't mix tainted and non-tainted temporaries. */
490 for (po = AvMAX(comppad); po > padix_floor; po--) {
ff0cee69 491 if (curpad[po] && !SvIMMORTAL(curpad[po]))
748a9306
LW		 492 SvPADTMP_off(curpad[po]);
493 }
494 padix = padix_floor;
79072805 495 }
a0d0e21e 496 pad_reset_pending = FALSE;
79072805
LW		 497}
498
a863c7d1 499#ifdef USE_THREADS
54b9620d 500/* find_threadsv is not reentrant */
a863c7d1 501PADOFFSET
54b9620d 502find_threadsv(char *name)
a863c7d1
MB		 503{
504 dTHR;
505 char *p;
506 PADOFFSET key;
554b3eca 507 SV **svp;
54b9620d
MB		 508 /* We currently only handle names of a single character */
509 p = strchr(threadsv_names, *name);
a863c7d1
MB		 510 if (!p)
511 return NOT_IN_PAD;
54b9620d
MB		 512 key = p - threadsv_names;
513 svp = av_fetch(thr->threadsv, key, FALSE);
554b3eca
MB		 514 if (!svp) {
515 SV *sv = NEWSV(0, 0);
54b9620d 516 av_store(thr->threadsv, key, sv);
940cb80d 517 thr->threadsvp = AvARRAY(thr->threadsv);
554b3eca
MB		 518 /*
519 * Some magic variables used to be automagically initialised
520 * in gv_fetchpv. Those which are now per-thread magicals get
521 * initialised here instead.
522 */
523 switch (*name) {
54b9620d
MB		 524 case '_':
525 break;
554b3eca
MB		 526 case ';':
527 sv_setpv(sv, "\034");
54b9620d 528 sv_magic(sv, 0, 0, name, 1);
554b3eca 529 break;
c277df42
IZ		 530 case '&':
531 case '`':
532 case '\'':
533 sawampersand = TRUE;
534 SvREADONLY_on(sv);
d8b5173a 535 /* FALL THROUGH */
54b9620d
MB		 536 default:
537 sv_magic(sv, 0, 0, name, 1);
554b3eca 538 }
a863c7d1 539 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
54b9620d 540 "find_threadsv: new SV %p for $%s%c\n",
554b3eca
MB		 541 sv, (*name < 32) ? "^" : "",
542 (*name < 32) ? toCTRL(*name) : *name));
a863c7d1
MB		 543 }
544 return key;
545}
546#endif /* USE_THREADS */
547
79072805
LW		 548/* Destructor */
549
550void
8ac85365 551op_free(OP *o)
79072805 552{
85e6fe83 553 register OP *kid, *nextkid;
79072805 554
5dc0d613 555 if (!o || o->op_seq == (U16)-1)
79072805
LW		 556 return;
557
11343788
MB		 558 if (o->op_flags & OPf_KIDS) {
559 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 560 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 561 op_free(kid);
85e6fe83 562 }
79072805
LW		 563 }
564
11343788 565 switch (o->op_type) {
8990e307 566 case OP_NULL:
11343788 567 o->op_targ = 0; /* Was holding old type, if any. */
8990e307 568 break;
a0d0e21e 569 case OP_ENTEREVAL:
11343788 570 o->op_targ = 0; /* Was holding hints. */
a0d0e21e 571 break;
554b3eca 572#ifdef USE_THREADS
2faa37cc 573 case OP_THREADSV:
54b9620d 574 o->op_targ = 0; /* Was holding index into thr->threadsv AV. */
554b3eca
MB		 575 break;
576#endif /* USE_THREADS */
a6006777 577 default:
5196be3e 578 if (!(o->op_flags & OPf_REF) || (check[o->op_type] != ck_ftst))
a6006777 579 break;
580 /* FALL THROUGH */
463ee0b2 581 case OP_GVSV:
79072805 582 case OP_GV:
a6006777 583 case OP_AELEMFAST:
11343788 584 SvREFCNT_dec(cGVOPo->op_gv);
8990e307
LW		 585 break;
586 case OP_NEXTSTATE:
587 case OP_DBSTATE:
5196be3e 588 Safefree(cCOPo->cop_label);
11343788 589 SvREFCNT_dec(cCOPo->cop_filegv);
79072805
LW		 590 break;
591 case OP_CONST:
11343788 592 SvREFCNT_dec(cSVOPo->op_sv);
79072805 593 break;
748a9306
LW		 594 case OP_GOTO:
595 case OP_NEXT:
596 case OP_LAST:
597 case OP_REDO:
11343788 598 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 599 break;
600 /* FALL THROUGH */
a0d0e21e 601 case OP_TRANS:
11343788 602 Safefree(cPVOPo->op_pv);
a0d0e21e
LW		 603 break;
604 case OP_SUBST:
11343788 605 op_free(cPMOPo->op_pmreplroot);
a0d0e21e 606 /* FALL THROUGH */
748a9306 607 case OP_PUSHRE:
a0d0e21e 608 case OP_MATCH:
c277df42 609 ReREFCNT_dec(cPMOPo->op_pmregexp);
a0d0e21e 610 break;
79072805
LW		 611 }
612
11343788
MB		 613 if (o->op_targ > 0)
614 pad_free(o->op_targ);
8990e307 615
11343788 616 Safefree(o);
79072805
LW		 617}
618
8990e307 619static void
8ac85365 620null(OP *o)
8990e307 621{
54b9620d 622 if (o->op_type != OP_NULL && o->op_type != OP_THREADSV && o->op_targ > 0)
11343788
MB		 623 pad_free(o->op_targ);
624 o->op_targ = o->op_type;
625 o->op_type = OP_NULL;
626 o->op_ppaddr = ppaddr[OP_NULL];
8990e307
LW		 627}
628
79072805
LW		 629/* Contextualizers */
630
463ee0b2 631#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 632
633OP *
8ac85365 634linklist(OP *o)
79072805
LW		 635{
636 register OP *kid;
637
11343788
MB		 638 if (o->op_next)
639 return o->op_next;
79072805
LW		 640
641 /* establish postfix order */
11343788
MB		 642 if (cUNOPo->op_first) {
643 o->op_next = LINKLIST(cUNOPo->op_first);
644 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 645 if (kid->op_sibling)
646 kid->op_next = LINKLIST(kid->op_sibling);
647 else
11343788 648 kid->op_next = o;
79072805
LW		 649 }
650 }
651 else
11343788 652 o->op_next = o;
79072805 653
11343788 654 return o->op_next;
79072805
LW		 655}
656
657OP *
8ac85365 658scalarkids(OP *o)
79072805
LW		 659{
660 OP *kid;
11343788
MB		 661 if (o && o->op_flags & OPf_KIDS) {
662 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 663 scalar(kid);
664 }
11343788 665 return o;
79072805
LW		 666}
667
a0d0e21e 668static OP *
8ac85365 669scalarboolean(OP *o)
8990e307
LW		 670{
671 if (dowarn &&
11343788 672 o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
0f15f207 673 dTHR;
a0d0e21e
LW		 674 line_t oldline = curcop->cop_line;
675
676 if (copline != NOLINE)
677 curcop->cop_line = copline;
678 warn("Found = in conditional, should be ==");
679 curcop->cop_line = oldline;
680 }
11343788 681 return scalar(o);
8990e307
LW		 682}
683
684OP *
8ac85365 685scalar(OP *o)
79072805
LW		 686{
687 OP *kid;
688
a0d0e21e 689 /* assumes no premature commitment */
5dc0d613
MB		 690 if (!o || (o->op_flags & OPf_WANT) || error_count
691 || o->op_type == OP_RETURN)
11343788 692 return o;
79072805 693
5dc0d613 694 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 695
11343788 696 switch (o->op_type) {
79072805 697 case OP_REPEAT:
11343788
MB		 698 if (o->op_private & OPpREPEAT_DOLIST)
699 null(((LISTOP*)cBINOPo->op_first)->op_first);
700 scalar(cBINOPo->op_first);
8990e307 701 break;
79072805
LW		 702 case OP_OR:
703 case OP_AND:
704 case OP_COND_EXPR:
11343788 705 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 706 scalar(kid);
79072805 707 break;
a0d0e21e 708 case OP_SPLIT:
11343788 709 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 710 if (!kPMOP->op_pmreplroot)
711 deprecate("implicit split to @_");
712 }
713 /* FALL THROUGH */
79072805
LW		 714 case OP_MATCH:
715 case OP_SUBST:
716 case OP_NULL:
8990e307 717 default:
11343788
MB		 718 if (o->op_flags & OPf_KIDS) {
719 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 720 scalar(kid);
721 }
79072805
LW		 722 break;
723 case OP_LEAVE:
724 case OP_LEAVETRY:
5dc0d613 725 kid = cLISTOPo->op_first;
54310121 726 scalar(kid);
727 while (kid = kid->op_sibling) {
728 if (kid->op_sibling)
729 scalarvoid(kid);
730 else
731 scalar(kid);
732 }
0f15f207 733 WITH_THR(curcop = &compiling);
54310121 734 break;
748a9306 735 case OP_SCOPE:
79072805 736 case OP_LINESEQ:
8990e307 737 case OP_LIST:
11343788 738 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 739 if (kid->op_sibling)
740 scalarvoid(kid);
741 else
742 scalar(kid);
743 }
0f15f207 744 WITH_THR(curcop = &compiling);
79072805
LW		 745 break;
746 }
11343788 747 return o;
79072805
LW		 748}
749
750OP *
8ac85365 751scalarvoid(OP *o)
79072805
LW		 752{
753 OP *kid;
8990e307
LW		 754 char* useless = 0;
755 SV* sv;
79072805 756
54310121 757 /* assumes no premature commitment */
5dc0d613
MB		 758 if (!o || (o->op_flags & OPf_WANT) == OPf_WANT_LIST || error_count
759 || o->op_type == OP_RETURN)
11343788 760 return o;
79072805 761
5dc0d613 762 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 763
11343788 764 switch (o->op_type) {
79072805 765 default:
11343788 766 if (!(opargs[o->op_type] & OA_FOLDCONST))
8990e307 767 break;
36477c24 768 /* FALL THROUGH */
769 case OP_REPEAT:
11343788 770 if (o->op_flags & OPf_STACKED)
8990e307
LW		 771 break;
772 /* FALL THROUGH */
773 case OP_GVSV:
774 case OP_WANTARRAY:
775 case OP_GV:
776 case OP_PADSV:
777 case OP_PADAV:
778 case OP_PADHV:
779 case OP_PADANY:
780 case OP_AV2ARYLEN:
8990e307 781 case OP_REF:
a0d0e21e
LW		 782 case OP_REFGEN:
783 case OP_SREFGEN:
8990e307
LW		 784 case OP_DEFINED:
785 case OP_HEX:
786 case OP_OCT:
787 case OP_LENGTH:
788 case OP_SUBSTR:
789 case OP_VEC:
790 case OP_INDEX:
791 case OP_RINDEX:
792 case OP_SPRINTF:
793 case OP_AELEM:
794 case OP_AELEMFAST:
795 case OP_ASLICE:
8990e307
LW		 796 case OP_HELEM:
797 case OP_HSLICE:
798 case OP_UNPACK:
799 case OP_PACK:
8990e307
LW		 800 case OP_JOIN:
801 case OP_LSLICE:
802 case OP_ANONLIST:
803 case OP_ANONHASH:
804 case OP_SORT:
805 case OP_REVERSE:
806 case OP_RANGE:
807 case OP_FLIP:
808 case OP_FLOP:
809 case OP_CALLER:
810 case OP_FILENO:
811 case OP_EOF:
812 case OP_TELL:
813 case OP_GETSOCKNAME:
814 case OP_GETPEERNAME:
815 case OP_READLINK:
816 case OP_TELLDIR:
817 case OP_GETPPID:
818 case OP_GETPGRP:
819 case OP_GETPRIORITY:
820 case OP_TIME:
821 case OP_TMS:
822 case OP_LOCALTIME:
823 case OP_GMTIME:
824 case OP_GHBYNAME:
825 case OP_GHBYADDR:
826 case OP_GHOSTENT:
827 case OP_GNBYNAME:
828 case OP_GNBYADDR:
829 case OP_GNETENT:
830 case OP_GPBYNAME:
831 case OP_GPBYNUMBER:
832 case OP_GPROTOENT:
833 case OP_GSBYNAME:
834 case OP_GSBYPORT:
835 case OP_GSERVENT:
836 case OP_GPWNAM:
837 case OP_GPWUID:
838 case OP_GGRNAM:
839 case OP_GGRGID:
840 case OP_GETLOGIN:
11343788
MB		 841 if (!(o->op_private & OPpLVAL_INTRO))
842 useless = op_desc[o->op_type];
8990e307
LW		 843 break;
844
845 case OP_RV2GV:
846 case OP_RV2SV:
847 case OP_RV2AV:
848 case OP_RV2HV:
11343788
MB		 849 if (!(o->op_private & OPpLVAL_INTRO) &&
850 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 851 useless = "a variable";
852 break;
79072805 853
93a17b20 854 case OP_NEXTSTATE:
8990e307 855 case OP_DBSTATE:
0f15f207 856 WITH_THR(curcop = ((COP*)o)); /* for warning below */
93a17b20
LW		 857 break;
858
79072805 859 case OP_CONST:
11343788 860 sv = cSVOPo->op_sv;
8990e307
LW		 861 if (dowarn) {
862 useless = "a constant";
863 if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
864 useless = 0;
865 else if (SvPOK(sv)) {
866 if (strnEQ(SvPVX(sv), "di", 2) ||
a0d0e21e 867 strnEQ(SvPVX(sv), "ds", 2) ||
8990e307
LW		 868 strnEQ(SvPVX(sv), "ig", 2))
869 useless = 0;
870 }
871 }
11343788 872 null(o); /* don't execute a constant */
8990e307 873 SvREFCNT_dec(sv); /* don't even remember it */
79072805
LW		 874 break;
875
876 case OP_POSTINC:
11343788
MB		 877 o->op_type = OP_PREINC; /* pre-increment is faster */
878 o->op_ppaddr = ppaddr[OP_PREINC];
79072805
LW		 879 break;
880
881 case OP_POSTDEC:
11343788
MB		 882 o->op_type = OP_PREDEC; /* pre-decrement is faster */
883 o->op_ppaddr = ppaddr[OP_PREDEC];
79072805
LW		 884 break;
885
79072805
LW		 886 case OP_OR:
887 case OP_AND:
888 case OP_COND_EXPR:
11343788 889 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 890 scalarvoid(kid);
891 break;
5aabfad6 892
a0d0e21e 893 case OP_NULL:
11343788 894 if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
0f15f207 895 WITH_THR(curcop = ((COP*)o)); /* for warning below */
11343788 896 if (o->op_flags & OPf_STACKED)
a0d0e21e 897 break;
5aabfad6 898 /* FALL THROUGH */
79072805
LW		 899 case OP_ENTERTRY:
900 case OP_ENTER:
901 case OP_SCALAR:
11343788 902 if (!(o->op_flags & OPf_KIDS))
79072805 903 break;
54310121 904 /* FALL THROUGH */
463ee0b2 905 case OP_SCOPE:
79072805
LW		 906 case OP_LEAVE:
907 case OP_LEAVETRY:
a0d0e21e 908 case OP_LEAVELOOP:
79072805 909 case OP_LINESEQ:
79072805 910 case OP_LIST:
11343788 911 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 912 scalarvoid(kid);
913 break;
c90c0ff4 914 case OP_ENTEREVAL:
5196be3e 915 scalarkids(o);
c90c0ff4 916 break;
5aabfad6 917 case OP_REQUIRE:
c90c0ff4 918 /* all requires must return a boolean value */
5196be3e
MB		 919 o->op_flags &= ~OPf_WANT;
920 return scalar(o);
a0d0e21e 921 case OP_SPLIT:
11343788 922 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 923 if (!kPMOP->op_pmreplroot)
924 deprecate("implicit split to @_");
925 }
926 break;
79072805 927 }
8990e307
LW		 928 if (useless && dowarn)
929 warn("Useless use of %s in void context", useless);
11343788 930 return o;
79072805
LW		 931}
932
933OP *
8ac85365 934listkids(OP *o)
79072805
LW		 935{
936 OP *kid;
11343788
MB		 937 if (o && o->op_flags & OPf_KIDS) {
938 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 939 list(kid);
940 }
11343788 941 return o;
79072805
LW		 942}
943
944OP *
8ac85365 945list(OP *o)
79072805
LW		 946{
947 OP *kid;
948
a0d0e21e 949 /* assumes no premature commitment */
5dc0d613
MB		 950 if (!o || (o->op_flags & OPf_WANT) || error_count
951 || o->op_type == OP_RETURN)
11343788 952 return o;
79072805 953
5dc0d613 954 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 955
11343788 956 switch (o->op_type) {
79072805
LW		 957 case OP_FLOP:
958 case OP_REPEAT:
11343788 959 list(cBINOPo->op_first);
79072805
LW		 960 break;
961 case OP_OR:
962 case OP_AND:
963 case OP_COND_EXPR:
11343788 964 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 965 list(kid);
966 break;
967 default:
968 case OP_MATCH:
969 case OP_SUBST:
970 case OP_NULL:
11343788 971 if (!(o->op_flags & OPf_KIDS))
79072805 972 break;
11343788
MB		 973 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
974 list(cBINOPo->op_first);
975 return gen_constant_list(o);
79072805
LW		 976 }
977 case OP_LIST:
11343788 978 listkids(o);
79072805
LW		 979 break;
980 case OP_LEAVE:
981 case OP_LEAVETRY:
5dc0d613 982 kid = cLISTOPo->op_first;
54310121 983 list(kid);
984 while (kid = kid->op_sibling) {
985 if (kid->op_sibling)
986 scalarvoid(kid);
987 else
988 list(kid);
989 }
0f15f207 990 WITH_THR(curcop = &compiling);
54310121 991 break;
748a9306 992 case OP_SCOPE:
79072805 993 case OP_LINESEQ:
11343788 994 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 995 if (kid->op_sibling)
996 scalarvoid(kid);
997 else
998 list(kid);
999 }
0f15f207 1000 WITH_THR(curcop = &compiling);
79072805 1001 break;
c90c0ff4 1002 case OP_REQUIRE:
1003 /* all requires must return a boolean value */
5196be3e
MB		 1004 o->op_flags &= ~OPf_WANT;
1005 return scalar(o);
79072805 1006 }
11343788 1007 return o;
79072805
LW		 1008}
1009
1010OP *
8ac85365 1011scalarseq(OP *o)
79072805
LW		 1012{
1013 OP *kid;
1014
11343788
MB		 1015 if (o) {
1016 if (o->op_type == OP_LINESEQ ||
1017 o->op_type == OP_SCOPE ||
1018 o->op_type == OP_LEAVE ||
1019 o->op_type == OP_LEAVETRY)
463ee0b2 1020 {
0f15f207 1021 dTHR;
11343788 1022 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 1023 if (kid->op_sibling) {
463ee0b2 1024 scalarvoid(kid);
ed6116ce 1025 }
463ee0b2
LW		 1026 }
1027 curcop = &compiling;
79072805 1028 }
11343788 1029 o->op_flags &= ~OPf_PARENS;
85e6fe83 1030 if (hints & HINT_BLOCK_SCOPE)
11343788 1031 o->op_flags |= OPf_PARENS;
79072805 1032 }
8990e307 1033 else
11343788
MB		 1034 o = newOP(OP_STUB, 0);
1035 return o;
79072805
LW		 1036}
1037
a0d0e21e 1038static OP *
8ac85365 1039modkids(OP *o, I32 type)
79072805
LW		 1040{
1041 OP *kid;
11343788
MB		 1042 if (o && o->op_flags & OPf_KIDS) {
1043 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 1044 mod(kid, type);
79072805 1045 }
11343788 1046 return o;
79072805
LW		 1047}
1048
463ee0b2 1049static I32 modcount;
79072805
LW		 1050
1051OP *
8ac85365 1052mod(OP *o, I32 type)
79072805 1053{
11343788 1054 dTHR;
79072805
LW		 1055 OP *kid;
1056 SV *sv;
1057
11343788
MB		 1058 if (!o || error_count)
1059 return o;
79072805 1060
11343788 1061 switch (o->op_type) {
68dc0745 1062 case OP_UNDEF:
3e3baf6d 1063 modcount++;
5dc0d613 1064 return o;
a0d0e21e 1065 case OP_CONST:
11343788 1066 if (!(o->op_private & (OPpCONST_ARYBASE)))
a0d0e21e
LW		 1067 goto nomod;
1068 if (eval_start && eval_start->op_type == OP_CONST) {
1069 compiling.cop_arybase = (I32)SvIV(((SVOP*)eval_start)->op_sv);
1070 eval_start = 0;
1071 }
1072 else if (!type) {
1073 SAVEI32(compiling.cop_arybase);
748a9306 1074 compiling.cop_arybase = 0;
a0d0e21e
LW		 1075 }
1076 else if (type == OP_REFGEN)
1077 goto nomod;
1078 else
1079 croak("That use of $[ is unsupported");
1080 break;
5f05dabc 1081 case OP_STUB:
5196be3e 1082 if (o->op_flags & OPf_PARENS)
5f05dabc 1083 break;
1084 goto nomod;
a0d0e21e
LW		 1085 case OP_ENTERSUB:
1086 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1087 !(o->op_flags & OPf_STACKED)) {
1088 o->op_type = OP_RV2CV; /* entersub => rv2cv */
1089 o->op_ppaddr = ppaddr[OP_RV2CV];
1090 assert(cUNOPo->op_first->op_type == OP_NULL);
1091 null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1092 break;
1093 }
1094 /* FALL THROUGH */
1095 default:
a0d0e21e
LW		 1096 nomod:
1097 /* grep, foreach, subcalls, refgen */
1098 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
1099 break;
46fc3d4c 1100 yyerror(form("Can't modify %s in %s",
5dc0d613 1101 op_desc[o->op_type],
46fc3d4c 1102 type ? op_desc[type] : "local"));
11343788 1103 return o;
79072805 1104
a0d0e21e
LW		 1105 case OP_PREINC:
1106 case OP_PREDEC:
1107 case OP_POW:
1108 case OP_MULTIPLY:
1109 case OP_DIVIDE:
1110 case OP_MODULO:
1111 case OP_REPEAT:
1112 case OP_ADD:
1113 case OP_SUBTRACT:
1114 case OP_CONCAT:
1115 case OP_LEFT_SHIFT:
1116 case OP_RIGHT_SHIFT:
1117 case OP_BIT_AND:
1118 case OP_BIT_XOR:
1119 case OP_BIT_OR:
1120 case OP_I_MULTIPLY:
1121 case OP_I_DIVIDE:
1122 case OP_I_MODULO:
1123 case OP_I_ADD:
1124 case OP_I_SUBTRACT:
11343788 1125 if (!(o->op_flags & OPf_STACKED))
a0d0e21e
LW		 1126 goto nomod;
1127 modcount++;
1128 break;
1129
79072805 1130 case OP_COND_EXPR:
11343788 1131 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1132 mod(kid, type);
79072805
LW		 1133 break;
1134
1135 case OP_RV2AV:
1136 case OP_RV2HV:
93af7a87 1137 if (!type && cUNOPo->op_first->op_type != OP_GV)
706a304b 1138 croak("Can't localize through a reference");
11343788 1139 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
748a9306 1140 modcount = 10000;
11343788 1141 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1142 }
1143 /* FALL THROUGH */
79072805 1144 case OP_RV2GV:
5dc0d613 1145 if (scalar_mod_type(o, type))
3fe9a6f1 1146 goto nomod;
11343788 1147 ref(cUNOPo->op_first, o->op_type);
79072805
LW		 1148 /* FALL THROUGH */
1149 case OP_AASSIGN:
1150 case OP_ASLICE:
1151 case OP_HSLICE:
93a17b20
LW		 1152 case OP_NEXTSTATE:
1153 case OP_DBSTATE:
a0d0e21e
LW		 1154 case OP_REFGEN:
1155 case OP_CHOMP:
463ee0b2 1156 modcount = 10000;
79072805 1157 break;
463ee0b2 1158 case OP_RV2SV:
11343788 1159 if (!type && cUNOPo->op_first->op_type != OP_GV)
706a304b 1160 croak("Can't localize through a reference");
aeea060c 1161 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1162 /* FALL THROUGH */
79072805 1163 case OP_GV:
463ee0b2 1164 case OP_AV2ARYLEN:
85aff577 1165 hints |= HINT_BLOCK_SCOPE;
463ee0b2 1166 case OP_SASSIGN:
8990e307
LW		 1167 case OP_AELEMFAST:
1168 modcount++;
1169 break;
1170
748a9306
LW		 1171 case OP_PADAV:
1172 case OP_PADHV:
1173 modcount = 10000;
5196be3e
MB		 1174 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1175 return o; /* Treat \(@foo) like ordinary list. */
1176 if (scalar_mod_type(o, type))
3fe9a6f1 1177 goto nomod;
748a9306
LW		 1178 /* FALL THROUGH */
1179 case OP_PADSV:
1180 modcount++;
1181 if (!type)
1182 croak("Can't localize lexical variable %s",
11343788 1183 SvPV(*av_fetch(comppad_name, o->op_targ, 4), na));
463ee0b2
LW		 1184 break;
1185
554b3eca 1186#ifdef USE_THREADS
2faa37cc 1187 case OP_THREADSV:
554b3eca 1188 modcount++; /* XXX ??? */
554b3eca
MB		 1189 break;
1190#endif /* USE_THREADS */
1191
748a9306
LW		 1192 case OP_PUSHMARK:
1193 break;
a0d0e21e 1194
69969c6f
SB		 1195 case OP_KEYS:
1196 if (type != OP_SASSIGN)
1197 goto nomod;
5f05dabc 1198 /* FALL THROUGH */
a0d0e21e 1199 case OP_POS:
463ee0b2 1200 case OP_VEC:
a0d0e21e 1201 case OP_SUBSTR:
11343788
MB		 1202 pad_free(o->op_targ);
1203 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1204 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1205 if (o->op_flags & OPf_KIDS)
1206 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1207 break;
a0d0e21e 1208
463ee0b2
LW		 1209 case OP_AELEM:
1210 case OP_HELEM:
11343788 1211 ref(cBINOPo->op_first, o->op_type);
68dc0745 1212 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1213 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1214 o->op_private |= OPpLVAL_DEFER;
a0d0e21e 1215 modcount++;
463ee0b2
LW		 1216 break;
1217
1218 case OP_SCOPE:
1219 case OP_LEAVE:
1220 case OP_ENTER:
11343788
MB		 1221 if (o->op_flags & OPf_KIDS)
1222 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1223 break;
1224
1225 case OP_NULL:
11343788 1226 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1227 break;
11343788
MB		 1228 if (o->op_targ != OP_LIST) {
1229 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1230 break;
1231 }
1232 /* FALL THROUGH */
463ee0b2 1233 case OP_LIST:
11343788 1234 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1235 mod(kid, type);
1236 break;
1237 }
11343788 1238 o->op_flags |= OPf_MOD;
a0d0e21e
LW		 1239
1240 if (type == OP_AASSIGN || type == OP_SASSIGN)
11343788 1241 o->op_flags |= OPf_SPECIAL|OPf_REF;
a0d0e21e 1242 else if (!type) {
11343788
MB		 1243 o->op_private |= OPpLVAL_INTRO;
1244 o->op_flags &= ~OPf_SPECIAL;
463ee0b2 1245 }
a0d0e21e 1246 else if (type != OP_GREPSTART && type != OP_ENTERSUB)
11343788
MB		 1247 o->op_flags |= OPf_REF;
1248 return o;
463ee0b2
LW		 1249}
1250
3fe9a6f1 1251static bool
8ac85365 1252scalar_mod_type(OP *o, I32 type)
3fe9a6f1 1253{
1254 switch (type) {
1255 case OP_SASSIGN:
5196be3e 1256 if (o->op_type == OP_RV2GV)
3fe9a6f1 1257 return FALSE;
1258 /* FALL THROUGH */
1259 case OP_PREINC:
1260 case OP_PREDEC:
1261 case OP_POSTINC:
1262 case OP_POSTDEC:
1263 case OP_I_PREINC:
1264 case OP_I_PREDEC:
1265 case OP_I_POSTINC:
1266 case OP_I_POSTDEC:
1267 case OP_POW:
1268 case OP_MULTIPLY:
1269 case OP_DIVIDE:
1270 case OP_MODULO:
1271 case OP_REPEAT:
1272 case OP_ADD:
1273 case OP_SUBTRACT:
1274 case OP_I_MULTIPLY:
1275 case OP_I_DIVIDE:
1276 case OP_I_MODULO:
1277 case OP_I_ADD:
1278 case OP_I_SUBTRACT:
1279 case OP_LEFT_SHIFT:
1280 case OP_RIGHT_SHIFT:
1281 case OP_BIT_AND:
1282 case OP_BIT_XOR:
1283 case OP_BIT_OR:
1284 case OP_CONCAT:
1285 case OP_SUBST:
1286 case OP_TRANS:
1287 case OP_ANDASSIGN: /* may work later */
1288 case OP_ORASSIGN: /* may work later */
1289 return TRUE;
1290 default:
1291 return FALSE;
1292 }
1293}
1294
463ee0b2 1295OP *
8ac85365 1296refkids(OP *o, I32 type)
463ee0b2
LW		 1297{
1298 OP *kid;
11343788
MB		 1299 if (o && o->op_flags & OPf_KIDS) {
1300 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1301 ref(kid, type);
1302 }
11343788 1303 return o;
463ee0b2
LW		 1304}
1305
1306OP *
8ac85365 1307ref(OP *o, I32 type)
463ee0b2
LW		 1308{
1309 OP *kid;
463ee0b2 1310
11343788
MB		 1311 if (!o || error_count)
1312 return o;
463ee0b2 1313
11343788 1314 switch (o->op_type) {
a0d0e21e 1315 case OP_ENTERSUB:
e55aaa0e 1316 if ((type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1317 !(o->op_flags & OPf_STACKED)) {
1318 o->op_type = OP_RV2CV; /* entersub => rv2cv */
1319 o->op_ppaddr = ppaddr[OP_RV2CV];
1320 assert(cUNOPo->op_first->op_type == OP_NULL);
1321 null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
1322 o->op_flags |= OPf_SPECIAL;
8990e307
LW		 1323 }
1324 break;
aeea060c 1325
463ee0b2 1326 case OP_COND_EXPR:
11343788 1327 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2
LW		 1328 ref(kid, type);
1329 break;
8990e307 1330 case OP_RV2SV:
11343788 1331 ref(cUNOPo->op_first, o->op_type);
4633a7c4
LW		 1332 /* FALL THROUGH */
1333 case OP_PADSV:
5f05dabc 1334 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1335 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1336 : type == OP_RV2HV ? OPpDEREF_HV
1337 : OPpDEREF_SV);
11343788 1338 o->op_flags |= OPf_MOD;
a0d0e21e 1339 }
8990e307
LW		 1340 break;
1341
2faa37cc 1342 case OP_THREADSV:
a863c7d1
MB		 1343 o->op_flags |= OPf_MOD; /* XXX ??? */
1344 break;
1345
463ee0b2
LW		 1346 case OP_RV2AV:
1347 case OP_RV2HV:
aeea060c 1348 o->op_flags |= OPf_REF;
8990e307 1349 /* FALL THROUGH */
463ee0b2 1350 case OP_RV2GV:
11343788 1351 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1352 break;
8990e307 1353
463ee0b2
LW		 1354 case OP_PADAV:
1355 case OP_PADHV:
aeea060c 1356 o->op_flags |= OPf_REF;
79072805 1357 break;
aeea060c 1358
8990e307 1359 case OP_SCALAR:
79072805 1360 case OP_NULL:
11343788 1361 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1362 break;
11343788 1363 ref(cBINOPo->op_first, type);
79072805
LW		 1364 break;
1365 case OP_AELEM:
1366 case OP_HELEM:
11343788 1367 ref(cBINOPo->op_first, o->op_type);
5f05dabc 1368 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1369 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1370 : type == OP_RV2HV ? OPpDEREF_HV
1371 : OPpDEREF_SV);
11343788 1372 o->op_flags |= OPf_MOD;
8990e307 1373 }
79072805
LW		 1374 break;
1375
463ee0b2 1376 case OP_SCOPE:
79072805
LW		 1377 case OP_LEAVE:
1378 case OP_ENTER:
8990e307 1379 case OP_LIST:
11343788 1380 if (!(o->op_flags & OPf_KIDS))
79072805 1381 break;
11343788 1382 ref(cLISTOPo->op_last, type);
79072805 1383 break;
a0d0e21e
LW		 1384 default:
1385 break;
79072805 1386 }
11343788 1387 return scalar(o);
8990e307 1388
79072805
LW		 1389}
1390
1391OP *
8ac85365 1392my(OP *o)
93a17b20
LW		 1393{
1394 OP *kid;
93a17b20
LW		 1395 I32 type;
1396
11343788
MB		 1397 if (!o || error_count)
1398 return o;
93a17b20 1399
11343788 1400 type = o->op_type;
93a17b20 1401 if (type == OP_LIST) {
11343788 1402 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
93a17b20
LW		 1403 my(kid);
1404 }
1405 else if (type != OP_PADSV &&
1406 type != OP_PADAV &&
1407 type != OP_PADHV &&
1408 type != OP_PUSHMARK)
1409 {
5dc0d613 1410 yyerror(form("Can't declare %s in my", op_desc[o->op_type]));
11343788 1411 return o;
93a17b20 1412 }
11343788
MB		 1413 o->op_flags |= OPf_MOD;
1414 o->op_private |= OPpLVAL_INTRO;
1415 return o;
93a17b20
LW		 1416}
1417
1418OP *
8ac85365 1419sawparens(OP *o)
79072805
LW		 1420{
1421 if (o)
1422 o->op_flags |= OPf_PARENS;
1423 return o;
1424}
1425
1426OP *
8ac85365 1427bind_match(I32 type, OP *left, OP *right)
79072805 1428{
11343788 1429 OP *o;
79072805 1430
2ae324a7 1431 if (dowarn &&
1432 (left->op_type == OP_RV2AV ||
1433 left->op_type == OP_RV2HV ||
1434 left->op_type == OP_PADAV ||
1435 left->op_type == OP_PADHV)) {
1436 char *desc = op_desc[(right->op_type == OP_SUBST ||
1437 right->op_type == OP_TRANS)
1438 ? right->op_type : OP_MATCH];
1439 char *sample = ((left->op_type == OP_RV2AV ||
1440 left->op_type == OP_PADAV)
1441 ? "@array" : "%hash");
1442 warn("Applying %s to %s will act on scalar(%s)", desc, sample, sample);
1443 }
1444
79072805
LW		 1445 if (right->op_type == OP_MATCH ||
1446 right->op_type == OP_SUBST ||
1447 right->op_type == OP_TRANS) {
1448 right->op_flags |= OPf_STACKED;
1449 if (right->op_type != OP_MATCH)
463ee0b2 1450 left = mod(left, right->op_type);
79072805 1451 if (right->op_type == OP_TRANS)
11343788 1452 o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805 1453 else
11343788 1454 o = prepend_elem(right->op_type, scalar(left), right);
79072805 1455 if (type == OP_NOT)
11343788
MB		 1456 return newUNOP(OP_NOT, 0, scalar(o));
1457 return o;
79072805
LW		 1458 }
1459 else
1460 return bind_match(type, left,
1461 pmruntime(newPMOP(OP_MATCH, 0), right, Nullop));
1462}
1463
1464OP *
8ac85365 1465invert(OP *o)
79072805 1466{
11343788
MB		 1467 if (!o)
1468 return o;
79072805 1469 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
11343788 1470 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1471}
1472
1473OP *
8ac85365 1474scope(OP *o)
79072805
LW		 1475{
1476 if (o) {
84902520 1477 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || tainting) {
463ee0b2
LW		 1478 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1479 o->op_type = OP_LEAVE;
1480 o->op_ppaddr = ppaddr[OP_LEAVE];
1481 }
1482 else {
1483 if (o->op_type == OP_LINESEQ) {
1484 OP *kid;
1485 o->op_type = OP_SCOPE;
1486 o->op_ppaddr = ppaddr[OP_SCOPE];
1487 kid = ((LISTOP*)o)->op_first;
748a9306
LW		 1488 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE){
1489 SvREFCNT_dec(((COP*)kid)->cop_filegv);
8990e307 1490 null(kid);
748a9306 1491 }
463ee0b2
LW		 1492 }
1493 else
748a9306 1494 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
463ee0b2 1495 }
79072805
LW		 1496 }
1497 return o;
1498}
1499
a0d0e21e 1500int
8ac85365 1501block_start(int full)
79072805 1502{
11343788 1503 dTHR;
a0d0e21e 1504 int retval = savestack_ix;
55497cff 1505 SAVEI32(comppad_name_floor);
1506 if (full) {
93965878 1507 if ((comppad_name_fill = AvFILLp(comppad_name)) > 0)
55497cff 1508 comppad_name_floor = comppad_name_fill;
1509 else
1510 comppad_name_floor = 0;
1511 }
1512 SAVEI32(min_intro_pending);
1513 SAVEI32(max_intro_pending);
a0d0e21e 1514 min_intro_pending = 0;
55497cff 1515 SAVEI32(comppad_name_fill);
1516 SAVEI32(padix_floor);
a0d0e21e
LW		 1517 padix_floor = padix;
1518 pad_reset_pending = FALSE;
55497cff 1519 SAVEI32(hints);
a0d0e21e
LW		 1520 hints &= ~HINT_BLOCK_SCOPE;
1521 return retval;
1522}
1523
1524OP*
8ac85365 1525block_end(I32 floor, OP *seq)
a0d0e21e 1526{
11343788 1527 dTHR;
a0d0e21e
LW		 1528 int needblockscope = hints & HINT_BLOCK_SCOPE;
1529 OP* retval = scalarseq(seq);
a0d0e21e
LW		 1530 LEAVE_SCOPE(floor);
1531 pad_reset_pending = FALSE;
1532 if (needblockscope)
1533 hints |= HINT_BLOCK_SCOPE; /* propagate out */
1534 pad_leavemy(comppad_name_fill);
bbce6d69 1535 cop_seqmax++;
a0d0e21e
LW		 1536 return retval;
1537}
1538
54b9620d
MB		 1539static OP *
1540newDEFSVOP(void)
1541{
1542#ifdef USE_THREADS
1543 OP *o = newOP(OP_THREADSV, 0);
1544 o->op_targ = find_threadsv("_");
1545 return o;
1546#else
1547 return newSVREF(newGVOP(OP_GV, 0, defgv));
1548#endif /* USE_THREADS */
1549}
1550
a0d0e21e 1551void
8ac85365 1552newPROG(OP *o)
a0d0e21e 1553{
11343788 1554 dTHR;
a0d0e21e 1555 if (in_eval) {
5dc0d613 1556 eval_root = newUNOP(OP_LEAVEEVAL, ((in_eval & 4) ? OPf_SPECIAL : 0), o);
a0d0e21e
LW		 1557 eval_start = linklist(eval_root);
1558 eval_root->op_next = 0;
1559 peep(eval_start);
1560 }
1561 else {
5dc0d613 1562 if (!o)
a0d0e21e 1563 return;
11343788 1564 main_root = scope(sawparens(scalarvoid(o)));
a0d0e21e
LW		 1565 curcop = &compiling;
1566 main_start = LINKLIST(main_root);
1567 main_root->op_next = 0;
1568 peep(main_start);
748a9306 1569 compcv = 0;
3841441e 1570
4fdae800 1571 /* Register with debugger */
84902520 1572 if (PERLDB_INTER) {
3841441e 1573 CV *cv = perl_get_cv("DB::postponed", FALSE);
3841441e
CS		 1574 if (cv) {
1575 dSP;
1576 PUSHMARK(sp);
1577 XPUSHs((SV*)compiling.cop_filegv);
1578 PUTBACK;
1579 perl_call_sv((SV*)cv, G_DISCARD);
1580 }
1581 }
79072805 1582 }
79072805
LW		 1583}
1584
1585OP *
8ac85365 1586localize(OP *o, I32 lex)
79072805
LW		 1587{
1588 if (o->op_flags & OPf_PARENS)
1589 list(o);
8990e307 1590 else {
8990e307
LW		 1591 if (dowarn && bufptr > oldbufptr && bufptr[-1] == ',') {
1592 char *s;
1593 for (s = bufptr; *s && (isALNUM(*s) || strchr("@$%, ",*s)); s++) ;
a0d0e21e 1594 if (*s == ';' || *s == '=')
8990e307
LW		 1595 warn("Parens missing around \"%s\" list", lex ? "my" : "local");
1596 }
1597 }
93a17b20 1598 in_my = FALSE;
c750a3ec 1599 in_my_stash = Nullhv;
93a17b20
LW		 1600 if (lex)
1601 return my(o);
1602 else
463ee0b2 1603 return mod(o, OP_NULL); /* a bit kludgey */
79072805
LW		 1604}
1605
1606OP *
8ac85365 1607jmaybe(OP *o)
79072805
LW		 1608{
1609 if (o->op_type == OP_LIST) {
554b3eca
MB		 1610 OP *o2;
1611#ifdef USE_THREADS
2faa37cc 1612 o2 = newOP(OP_THREADSV, 0);
54b9620d 1613 o2->op_targ = find_threadsv(";");
554b3eca
MB		 1614#else
1615 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
1616#endif /* USE_THREADS */
1617 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 1618 }
1619 return o;
1620}
1621
1622OP *
8ac85365 1623fold_constants(register OP *o)
79072805 1624{
11343788 1625 dTHR;
79072805
LW		 1626 register OP *curop;
1627 I32 type = o->op_type;
748a9306 1628 SV *sv;
79072805
LW		 1629
1630 if (opargs[type] & OA_RETSCALAR)
1631 scalar(o);
1632 if (opargs[type] & OA_TARGET)
ed6116ce 1633 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 1634
85e6fe83 1635 if ((opargs[type] & OA_OTHERINT) && (hints & HINT_INTEGER))
a0d0e21e 1636 o->op_ppaddr = ppaddr[type = ++(o->op_type)];
85e6fe83 1637
79072805
LW		 1638 if (!(opargs[type] & OA_FOLDCONST))
1639 goto nope;
1640
de939608
CS		 1641 switch (type) {
1642 case OP_SPRINTF:
1643 case OP_UCFIRST:
1644 case OP_LCFIRST:
1645 case OP_UC:
1646 case OP_LC:
69dcf70c
MB		 1647 case OP_SLT:
1648 case OP_SGT:
1649 case OP_SLE:
1650 case OP_SGE:
1651 case OP_SCMP:
1652
de939608
CS		 1653 if (o->op_private & OPpLOCALE)
1654 goto nope;
1655 }
1656
a0d0e21e
LW		 1657 if (error_count)
1658 goto nope; /* Don't try to run w/ errors */
1659
79072805 1660 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
93a17b20
LW		 1661 if (curop->op_type != OP_CONST &&
1662 curop->op_type != OP_LIST &&
1663 curop->op_type != OP_SCALAR &&
a0d0e21e 1664 curop->op_type != OP_NULL &&
93a17b20 1665 curop->op_type != OP_PUSHMARK) {
79072805
LW		 1666 goto nope;
1667 }
1668 }
1669
1670 curop = LINKLIST(o);
1671 o->op_next = 0;
1672 op = curop;
8da795c6 1673 runops();
748a9306
LW		 1674 sv = *(stack_sp--);
1675 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
79072805 1676 pad_swipe(o->op_targ);
748a9306
LW		 1677 else if (SvTEMP(sv)) { /* grab mortal temp? */
1678 (void)SvREFCNT_inc(sv);
1679 SvTEMP_off(sv);
85e6fe83 1680 }
79072805
LW		 1681 op_free(o);
1682 if (type == OP_RV2GV)
b1cb66bf 1683 return newGVOP(OP_GV, 0, (GV*)sv);
748a9306
LW		 1684 else {
1685 if ((SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK)) == SVf_NOK) {
1686 IV iv = SvIV(sv);
1687 if ((double)iv == SvNV(sv)) { /* can we smush double to int */
1688 SvREFCNT_dec(sv);
1689 sv = newSViv(iv);
1690 }
b1cb66bf 1691 else
1692 SvIOK_off(sv); /* undo SvIV() damage */
748a9306
LW		 1693 }
1694 return newSVOP(OP_CONST, 0, sv);
1695 }
aeea060c 1696
79072805
LW		 1697 nope:
1698 if (!(opargs[type] & OA_OTHERINT))
1699 return o;
79072805 1700
85e6fe83 1701 if (!(hints & HINT_INTEGER)) {
a0d0e21e 1702 if (type == OP_DIVIDE || !(o->op_flags & OPf_KIDS))
85e6fe83
LW		 1703 return o;
1704
1705 for (curop = ((UNOP*)o)->op_first; curop; curop = curop->op_sibling) {
1706 if (curop->op_type == OP_CONST) {
b1cb66bf 1707 if (SvIOK(((SVOP*)curop)->op_sv))
85e6fe83
LW		 1708 continue;
1709 return o;
1710 }
1711 if (opargs[curop->op_type] & OA_RETINTEGER)
79072805
LW		 1712 continue;
1713 return o;
1714 }
a0d0e21e 1715 o->op_ppaddr = ppaddr[++(o->op_type)];
79072805
LW		 1716 }
1717
79072805
LW		 1718 return o;
1719}
1720
1721OP *
8ac85365 1722gen_constant_list(register OP *o)
79072805 1723{
11343788 1724 dTHR;
79072805 1725 register OP *curop;
79072805 1726 I32 oldtmps_floor = tmps_floor;
79072805 1727
a0d0e21e
LW		 1728 list(o);
1729 if (error_count)
1730 return o; /* Don't attempt to run with errors */
1731
1732 op = curop = LINKLIST(o);
1733 o->op_next = 0;
11343788 1734 pp_pushmark(ARGS);
8da795c6 1735 runops();
a0d0e21e 1736 op = curop;
11343788 1737 pp_anonlist(ARGS);
79072805 1738 tmps_floor = oldtmps_floor;
79072805
LW		 1739
1740 o->op_type = OP_RV2AV;
1741 o->op_ppaddr = ppaddr[OP_RV2AV];
79072805 1742 curop = ((UNOP*)o)->op_first;
a0d0e21e 1743 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*stack_sp--));
79072805 1744 op_free(curop);
79072805
LW		 1745 linklist(o);
1746 return list(o);
1747}
1748
1749OP *
8ac85365 1750convert(I32 type, I32 flags, OP *o)
79072805
LW		 1751{
1752 OP *kid;
a0d0e21e 1753 OP *last = 0;
79072805 1754
11343788
MB		 1755 if (!o || o->op_type != OP_LIST)
1756 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 1757 else
5dc0d613 1758 o->op_flags &= ~OPf_WANT;
79072805 1759
8990e307 1760 if (!(opargs[type] & OA_MARK))
11343788 1761 null(cLISTOPo->op_first);
8990e307 1762
11343788
MB		 1763 o->op_type = type;
1764 o->op_ppaddr = ppaddr[type];
1765 o->op_flags |= flags;
79072805 1766
11343788
MB		 1767 o = CHECKOP(type, o);
1768 if (o->op_type != type)
1769 return o;
79072805 1770
11343788 1771 if (cLISTOPo->op_children < 7) {
79072805 1772 /* XXX do we really need to do this if we're done appending?? */
11343788 1773 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805 1774 last = kid;
11343788 1775 cLISTOPo->op_last = last; /* in case check substituted last arg */
79072805
LW		 1776 }
1777
11343788 1778 return fold_constants(o);
79072805
LW		 1779}
1780
1781/* List constructors */
1782
1783OP *
8ac85365 1784append_elem(I32 type, OP *first, OP *last)
79072805
LW		 1785{
1786 if (!first)
1787 return last;
8990e307
LW		 1788
1789 if (!last)
79072805 1790 return first;
8990e307 1791
a0d0e21e
LW		 1792 if (first->op_type != type || type==OP_LIST && first->op_flags & OPf_PARENS)
1793 return newLISTOP(type, 0, first, last);
79072805 1794
a0d0e21e
LW		 1795 if (first->op_flags & OPf_KIDS)
1796 ((LISTOP*)first)->op_last->op_sibling = last;
1797 else {
1798 first->op_flags |= OPf_KIDS;
1799 ((LISTOP*)first)->op_first = last;
1800 }
1801 ((LISTOP*)first)->op_last = last;
1802 ((LISTOP*)first)->op_children++;
1803 return first;
79072805
LW		 1804}
1805
1806OP *
8ac85365 1807append_list(I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 1808{
1809 if (!first)
1810 return (OP*)last;
8990e307
LW		 1811
1812 if (!last)
79072805 1813 return (OP*)first;
8990e307
LW		 1814
1815 if (first->op_type != type)
79072805 1816 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307
LW		 1817
1818 if (last->op_type != type)
79072805
LW		 1819 return append_elem(type, (OP*)first, (OP*)last);
1820
1821 first->op_last->op_sibling = last->op_first;
1822 first->op_last = last->op_last;
1823 first->op_children += last->op_children;
1824 if (first->op_children)
1825 last->op_flags |= OPf_KIDS;
1826
1827 Safefree(last);
1828 return (OP*)first;
1829}
1830
1831OP *
8ac85365 1832prepend_elem(I32 type, OP *first, OP *last)
79072805
LW		 1833{
1834 if (!first)
1835 return last;
8990e307
LW		 1836
1837 if (!last)
79072805 1838 return first;
8990e307
LW		 1839
1840 if (last->op_type == type) {
1841 if (type == OP_LIST) { /* already a PUSHMARK there */
1842 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
1843 ((LISTOP*)last)->op_first->op_sibling = first;
1844 }
1845 else {
1846 if (!(last->op_flags & OPf_KIDS)) {
1847 ((LISTOP*)last)->op_last = first;
1848 last->op_flags |= OPf_KIDS;
1849 }
1850 first->op_sibling = ((LISTOP*)last)->op_first;
1851 ((LISTOP*)last)->op_first = first;
79072805 1852 }
79072805
LW		 1853 ((LISTOP*)last)->op_children++;
1854 return last;
1855 }
1856
1857 return newLISTOP(type, 0, first, last);
1858}
1859
1860/* Constructors */
1861
1862OP *
8ac85365 1863newNULLLIST(void)
79072805 1864{
8990e307
LW		 1865 return newOP(OP_STUB, 0);
1866}
1867
1868OP *
8ac85365 1869force_list(OP *o)
8990e307 1870{
11343788
MB		 1871 if (!o || o->op_type != OP_LIST)
1872 o = newLISTOP(OP_LIST, 0, o, Nullop);
1873 null(o);
1874 return o;
79072805
LW		 1875}
1876
1877OP *
8ac85365 1878newLISTOP(I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 1879{
1880 LISTOP *listop;
1881
1882 Newz(1101, listop, 1, LISTOP);
1883
1884 listop->op_type = type;
1885 listop->op_ppaddr = ppaddr[type];
1886 listop->op_children = (first != 0) + (last != 0);
1887 listop->op_flags = flags;
79072805
LW		 1888
1889 if (!last && first)
1890 last = first;
1891 else if (!first && last)
1892 first = last;
8990e307
LW		 1893 else if (first)
1894 first->op_sibling = last;
79072805
LW		 1895 listop->op_first = first;
1896 listop->op_last = last;
8990e307
LW		 1897 if (type == OP_LIST) {
1898 OP* pushop;
1899 pushop = newOP(OP_PUSHMARK, 0);
1900 pushop->op_sibling = first;
1901 listop->op_first = pushop;
1902 listop->op_flags |= OPf_KIDS;
1903 if (!last)
1904 listop->op_last = pushop;
1905 }
1906 else if (listop->op_children)
1907 listop->op_flags |= OPf_KIDS;
79072805
LW		 1908
1909 return (OP*)listop;
1910}
1911
1912OP *
8ac85365 1913newOP(I32 type, I32 flags)
79072805 1914{
11343788
MB		 1915 OP *o;
1916 Newz(1101, o, 1, OP);
1917 o->op_type = type;
1918 o->op_ppaddr = ppaddr[type];
1919 o->op_flags = flags;
79072805 1920
11343788
MB		 1921 o->op_next = o;
1922 o->op_private = 0 + (flags >> 8);
79072805 1923 if (opargs[type] & OA_RETSCALAR)
11343788 1924 scalar(o);
79072805 1925 if (opargs[type] & OA_TARGET)
11343788
MB		 1926 o->op_targ = pad_alloc(type, SVs_PADTMP);
1927 return CHECKOP(type, o);
79072805
LW		 1928}
1929
1930OP *
8ac85365 1931newUNOP(I32 type, I32 flags, OP *first)
79072805
LW		 1932{
1933 UNOP *unop;
1934
93a17b20 1935 if (!first)
aeea060c 1936 first = newOP(OP_STUB, 0);
8990e307
LW		 1937 if (opargs[type] & OA_MARK)
1938 first = force_list(first);
93a17b20 1939
79072805
LW		 1940 Newz(1101, unop, 1, UNOP);
1941 unop->op_type = type;
1942 unop->op_ppaddr = ppaddr[type];
1943 unop->op_first = first;
1944 unop->op_flags = flags | OPf_KIDS;
c07a80fd 1945 unop->op_private = 1 | (flags >> 8);
c277df42
IZ		 1946#if 1
1947 if(type == OP_STUDY && first->op_type == OP_MATCH) {
1948 first->op_type = OP_PUSHRE;
1949 first->op_ppaddr = ppaddr[OP_PUSHRE];
1950 }
1951#endif
e50aee73 1952 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 1953 if (unop->op_next)
1954 return (OP*)unop;
1955
a0d0e21e 1956 return fold_constants((OP *) unop);
79072805
LW		 1957}
1958
1959OP *
8ac85365 1960newBINOP(I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 1961{
1962 BINOP *binop;
1963 Newz(1101, binop, 1, BINOP);
1964
1965 if (!first)
1966 first = newOP(OP_NULL, 0);
1967
1968 binop->op_type = type;
1969 binop->op_ppaddr = ppaddr[type];
1970 binop->op_first = first;
1971 binop->op_flags = flags | OPf_KIDS;
1972 if (!last) {
1973 last = first;
c07a80fd 1974 binop->op_private = 1 | (flags >> 8);
79072805
LW		 1975 }
1976 else {
c07a80fd 1977 binop->op_private = 2 | (flags >> 8);
79072805
LW		 1978 first->op_sibling = last;
1979 }
1980
e50aee73 1981 binop = (BINOP*)CHECKOP(type, binop);
79072805
LW		 1982 if (binop->op_next)
1983 return (OP*)binop;
1984
1985 binop->op_last = last = binop->op_first->op_sibling;
1986
a0d0e21e 1987 return fold_constants((OP *)binop);
79072805
LW		 1988}
1989
1990OP *
8ac85365 1991pmtrans(OP *o, OP *expr, OP *repl)
79072805 1992{
79072805
LW		 1993 SV *tstr = ((SVOP*)expr)->op_sv;
1994 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 1995 STRLEN tlen;
1996 STRLEN rlen;
ec49126f 1997 register U8 *t = (U8*)SvPV(tstr, tlen);
1998 register U8 *r = (U8*)SvPV(rstr, rlen);
79072805
LW		 1999 register I32 i;
2000 register I32 j;
8ac85365 2001 I32 Delete;
79072805 2002 I32 complement;
5d06d08e 2003 I32 squash;
79072805
LW		 2004 register short *tbl;
2005
11343788
MB		 2006 tbl = (short*)cPVOPo->op_pv;
2007 complement = o->op_private & OPpTRANS_COMPLEMENT;
8ac85365 2008 Delete = o->op_private & OPpTRANS_DELETE;
5d06d08e 2009 squash = o->op_private & OPpTRANS_SQUASH;
79072805
LW		 2010
2011 if (complement) {
2012 Zero(tbl, 256, short);
2013 for (i = 0; i < tlen; i++)
ec49126f 2014 tbl[t[i]] = -1;
79072805
LW		 2015 for (i = 0, j = 0; i < 256; i++) {
2016 if (!tbl[i]) {
2017 if (j >= rlen) {
8ac85365 2018 if (Delete)
79072805
LW		 2019 tbl[i] = -2;
2020 else if (rlen)
ec49126f 2021 tbl[i] = r[j-1];
79072805
LW		 2022 else
2023 tbl[i] = i;
2024 }
2025 else
ec49126f 2026 tbl[i] = r[j++];
79072805
LW		 2027 }
2028 }
2029 }
2030 else {
8ac85365 2031 if (!rlen && !Delete) {
79072805 2032 r = t; rlen = tlen;
5d06d08e
MB		 2033 if (!squash)
2034 o->op_private |= OPpTRANS_COUNTONLY;
79072805
LW		 2035 }
2036 for (i = 0; i < 256; i++)
2037 tbl[i] = -1;
2038 for (i = 0, j = 0; i < tlen; i++,j++) {
2039 if (j >= rlen) {
8ac85365 2040 if (Delete) {
ec49126f 2041 if (tbl[t[i]] == -1)
2042 tbl[t[i]] = -2;
79072805
LW		 2043 continue;
2044 }
2045 --j;
2046 }
ec49126f 2047 if (tbl[t[i]] == -1)
2048 tbl[t[i]] = r[j];
79072805
LW		 2049 }
2050 }
2051 op_free(expr);
2052 op_free(repl);
2053
11343788 2054 return o;
79072805
LW		 2055}
2056
2057OP *
8ac85365 2058newPMOP(I32 type, I32 flags)
79072805 2059{
11343788 2060 dTHR;
79072805
LW		 2061 PMOP *pmop;
2062
2063 Newz(1101, pmop, 1, PMOP);
2064 pmop->op_type = type;
2065 pmop->op_ppaddr = ppaddr[type];
2066 pmop->op_flags = flags;
c07a80fd 2067 pmop->op_private = 0 | (flags >> 8);
79072805 2068
36477c24 2069 if (hints & HINT_LOCALE)
2070 pmop->op_pmpermflags = (pmop->op_pmflags |= PMf_LOCALE);
2071
79072805 2072 /* link into pm list */
a0d0e21e 2073 if (type != OP_TRANS && curstash) {
79072805
LW		 2074 pmop->op_pmnext = HvPMROOT(curstash);
2075 HvPMROOT(curstash) = pmop;
2076 }
2077
2078 return (OP*)pmop;
2079}
2080
2081OP *
8ac85365 2082pmruntime(OP *o, OP *expr, OP *repl)
79072805
LW		 2083{
2084 PMOP *pm;
2085 LOGOP *rcop;
2086
11343788
MB		 2087 if (o->op_type == OP_TRANS)
2088 return pmtrans(o, expr, repl);
79072805 2089
3e3baf6d 2090 hints |= HINT_BLOCK_SCOPE;
11343788 2091 pm = (PMOP*)o;
79072805
LW		 2092
2093 if (expr->op_type == OP_CONST) {
463ee0b2 2094 STRLEN plen;
79072805 2095 SV *pat = ((SVOP*)expr)->op_sv;
463ee0b2 2096 char *p = SvPV(pat, plen);
11343788 2097 if ((o->op_flags & OPf_SPECIAL) && strEQ(p, " ")) {
93a17b20 2098 sv_setpvn(pat, "\\s+", 3);
463ee0b2 2099 p = SvPV(pat, plen);
79072805
LW		 2100 pm->op_pmflags |= PMf_SKIPWHITE;
2101 }
e50aee73 2102 pm->op_pmregexp = pregcomp(p, p + plen, pm);
aeea060c 2103 if (strEQ("\\s+", pm->op_pmregexp->precomp))
85e6fe83 2104 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2105 op_free(expr);
2106 }
2107 else {
463ee0b2
LW		 2108 if (pm->op_pmflags & PMf_KEEP)
2109 expr = newUNOP(OP_REGCMAYBE,0,expr);
2110
79072805
LW		 2111 Newz(1101, rcop, 1, LOGOP);
2112 rcop->op_type = OP_REGCOMP;
2113 rcop->op_ppaddr = ppaddr[OP_REGCOMP];
2114 rcop->op_first = scalar(expr);
2115 rcop->op_flags |= OPf_KIDS;
2116 rcop->op_private = 1;
11343788 2117 rcop->op_other = o;
79072805
LW		 2118
2119 /* establish postfix order */
463ee0b2
LW		 2120 if (pm->op_pmflags & PMf_KEEP) {
2121 LINKLIST(expr);
2122 rcop->op_next = expr;
2123 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2124 }
2125 else {
2126 rcop->op_next = LINKLIST(expr);
2127 expr->op_next = (OP*)rcop;
2128 }
79072805 2129
11343788 2130 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2131 }
2132
2133 if (repl) {
748a9306
LW		 2134 OP *curop;
2135 if (pm->op_pmflags & PMf_EVAL)
2136 curop = 0;
554b3eca 2137#ifdef USE_THREADS
2faa37cc 2138 else if (repl->op_type == OP_THREADSV
554b3eca 2139 && strchr("&`'123456789+",
54b9620d 2140 threadsv_names[repl->op_targ]))
554b3eca
MB		 2141 {
2142 curop = 0;
2143 }
2144#endif /* USE_THREADS */
748a9306
LW		 2145 else if (repl->op_type == OP_CONST)
2146 curop = repl;
79072805 2147 else {
79072805
LW		 2148 OP *lastop = 0;
2149 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
2150 if (opargs[curop->op_type] & OA_DANGEROUS) {
554b3eca 2151#ifdef USE_THREADS
2faa37cc 2152 if (curop->op_type == OP_THREADSV
554b3eca
MB		 2153 && strchr("&`'123456789+", curop->op_private)) {
2154 break;
2155 }
2156#else
79072805
LW		 2157 if (curop->op_type == OP_GV) {
2158 GV *gv = ((GVOP*)curop)->op_gv;
93a17b20 2159 if (strchr("&`'123456789+", *GvENAME(gv)))
79072805
LW		 2160 break;
2161 }
554b3eca 2162#endif /* USE_THREADS */
79072805
LW		 2163 else if (curop->op_type == OP_RV2CV)
2164 break;
2165 else if (curop->op_type == OP_RV2SV ||
2166 curop->op_type == OP_RV2AV ||
2167 curop->op_type == OP_RV2HV ||
2168 curop->op_type == OP_RV2GV) {
2169 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2170 break;
2171 }
748a9306
LW		 2172 else if (curop->op_type == OP_PADSV ||
2173 curop->op_type == OP_PADAV ||
2174 curop->op_type == OP_PADHV ||
554b3eca 2175 curop->op_type == OP_PADANY) {
748a9306
LW		 2176 /* is okay */
2177 }
79072805
LW		 2178 else
2179 break;
2180 }
2181 lastop = curop;
2182 }
748a9306
LW		 2183 }
2184 if (curop == repl) {
2185 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2186 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2187 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2188 }
2189 else {
2190 Newz(1101, rcop, 1, LOGOP);
2191 rcop->op_type = OP_SUBSTCONT;
2192 rcop->op_ppaddr = ppaddr[OP_SUBSTCONT];
2193 rcop->op_first = scalar(repl);
2194 rcop->op_flags |= OPf_KIDS;
2195 rcop->op_private = 1;
11343788 2196 rcop->op_other = o;
748a9306
LW		 2197
2198 /* establish postfix order */
2199 rcop->op_next = LINKLIST(repl);
2200 repl->op_next = (OP*)rcop;
2201
2202 pm->op_pmreplroot = scalar((OP*)rcop);
2203 pm->op_pmreplstart = LINKLIST(rcop);
2204 rcop->op_next = 0;
79072805
LW		 2205 }
2206 }
2207
2208 return (OP*)pm;
2209}
2210
2211OP *
8ac85365 2212newSVOP(I32 type, I32 flags, SV *sv)
79072805
LW		 2213{
2214 SVOP *svop;
2215 Newz(1101, svop, 1, SVOP);
2216 svop->op_type = type;
2217 svop->op_ppaddr = ppaddr[type];
2218 svop->op_sv = sv;
2219 svop->op_next = (OP*)svop;
2220 svop->op_flags = flags;
2221 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2222 scalar((OP*)svop);
79072805 2223 if (opargs[type] & OA_TARGET)
ed6116ce 2224 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2225 return CHECKOP(type, svop);
79072805
LW		 2226}
2227
2228OP *
8ac85365 2229newGVOP(I32 type, I32 flags, GV *gv)
79072805 2230{
11343788 2231 dTHR;
79072805
LW		 2232 GVOP *gvop;
2233 Newz(1101, gvop, 1, GVOP);
2234 gvop->op_type = type;
2235 gvop->op_ppaddr = ppaddr[type];
8990e307 2236 gvop->op_gv = (GV*)SvREFCNT_inc(gv);
79072805
LW		 2237 gvop->op_next = (OP*)gvop;
2238 gvop->op_flags = flags;
2239 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2240 scalar((OP*)gvop);
79072805 2241 if (opargs[type] & OA_TARGET)
ed6116ce 2242 gvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2243 return CHECKOP(type, gvop);
79072805
LW		 2244}
2245
2246OP *
8ac85365 2247newPVOP(I32 type, I32 flags, char *pv)
79072805
LW		 2248{
2249 PVOP *pvop;
2250 Newz(1101, pvop, 1, PVOP);
2251 pvop->op_type = type;
2252 pvop->op_ppaddr = ppaddr[type];
2253 pvop->op_pv = pv;
2254 pvop->op_next = (OP*)pvop;
2255 pvop->op_flags = flags;
2256 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2257 scalar((OP*)pvop);
79072805 2258 if (opargs[type] & OA_TARGET)
ed6116ce 2259 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2260 return CHECKOP(type, pvop);
79072805
LW		 2261}
2262
79072805 2263void
8ac85365 2264package(OP *o)
79072805 2265{
11343788 2266 dTHR;
93a17b20 2267 SV *sv;
79072805
LW		 2268
2269 save_hptr(&curstash);
2270 save_item(curstname);
11343788 2271 if (o) {
463ee0b2
LW		 2272 STRLEN len;
2273 char *name;
11343788 2274 sv = cSVOPo->op_sv;
463ee0b2 2275 name = SvPV(sv, len);
b1cb66bf 2276 curstash = gv_stashpvn(name,len,TRUE);
463ee0b2 2277 sv_setpvn(curstname, name, len);
11343788 2278 op_free(o);
93a17b20
LW		 2279 }
2280 else {
2281 sv_setpv(curstname,"<none>");
2282 curstash = Nullhv;
2283 }
79072805 2284 copline = NOLINE;
8990e307 2285 expect = XSTATE;
79072805
LW		 2286}
2287
85e6fe83 2288void
8ac85365 2289utilize(int aver, I32 floor, OP *version, OP *id, OP *arg)
85e6fe83 2290{
a0d0e21e
LW		 2291 OP *pack;
2292 OP *meth;
2293 OP *rqop;
2294 OP *imop;
b1cb66bf 2295 OP *veop;
85e6fe83 2296
a0d0e21e
LW		 2297 if (id->op_type != OP_CONST)
2298 croak("Module name must be constant");
85e6fe83 2299
b1cb66bf 2300 veop = Nullop;
2301
2302 if(version != Nullop) {
2303 SV *vesv = ((SVOP*)version)->op_sv;
2304
2305 if (arg == Nullop && !SvNIOK(vesv)) {
2306 arg = version;
2307 }
2308 else {
2309 OP *pack;
2310 OP *meth;
2311
2312 if (version->op_type != OP_CONST || !SvNIOK(vesv))
2313 croak("Version number must be constant number");
2314
2315 /* Make copy of id so we don't free it twice */
2316 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
2317
2318 /* Fake up a method call to VERSION */
2319 meth = newSVOP(OP_CONST, 0, newSVpv("VERSION", 7));
2320 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
2321 append_elem(OP_LIST,
2322 prepend_elem(OP_LIST, pack, list(version)),
2323 newUNOP(OP_METHOD, 0, meth)));
2324 }
2325 }
aeea060c 2326
a0d0e21e 2327 /* Fake up an import/unimport */
4633a7c4
LW		 2328 if (arg && arg->op_type == OP_STUB)
2329 imop = arg; /* no import on explicit () */
b1cb66bf 2330 else if(SvNIOK(((SVOP*)id)->op_sv)) {
2331 imop = Nullop; /* use 5.0; */
2332 }
4633a7c4
LW		 2333 else {
2334 /* Make copy of id so we don't free it twice */
2335 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
4633a7c4
LW		 2336 meth = newSVOP(OP_CONST, 0,
2337 aver
2338 ? newSVpv("import", 6)
2339 : newSVpv("unimport", 8)
2340 );
2341 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
a0d0e21e
LW		 2342 append_elem(OP_LIST,
2343 prepend_elem(OP_LIST, pack, list(arg)),
2344 newUNOP(OP_METHOD, 0, meth)));
4633a7c4
LW		 2345 }
2346
2347 /* Fake up a require */
2348 rqop = newUNOP(OP_REQUIRE, 0, id);
a0d0e21e
LW		 2349
2350 /* Fake up the BEGIN {}, which does its thing immediately. */
c07a80fd 2351 newSUB(floor,
a0d0e21e 2352 newSVOP(OP_CONST, 0, newSVpv("BEGIN", 5)),
4633a7c4 2353 Nullop,
a0d0e21e 2354 append_elem(OP_LINESEQ,
b1cb66bf 2355 append_elem(OP_LINESEQ,
2356 newSTATEOP(0, Nullch, rqop),
2357 newSTATEOP(0, Nullch, veop)),
a0d0e21e 2358 newSTATEOP(0, Nullch, imop) ));
85e6fe83 2359
85e6fe83
LW		 2360 copline = NOLINE;
2361 expect = XSTATE;
2362}
2363
79072805 2364OP *
8ac85365 2365newSLICEOP(I32 flags, OP *subscript, OP *listval)
79072805
LW		 2366{
2367 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 2368 list(force_list(subscript)),
2369 list(force_list(listval)) );
79072805
LW		 2370}
2371
2372static I32
8ac85365 2373list_assignment(register OP *o)
79072805 2374{
11343788 2375 if (!o)
79072805
LW		 2376 return TRUE;
2377
11343788
MB		 2378 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
2379 o = cUNOPo->op_first;
79072805 2380
11343788
MB		 2381 if (o->op_type == OP_COND_EXPR) {
2382 I32 t = list_assignment(cCONDOPo->op_first->op_sibling);
2383 I32 f = list_assignment(cCONDOPo->op_first->op_sibling->op_sibling);
79072805
LW		 2384
2385 if (t && f)
2386 return TRUE;
2387 if (t || f)
2388 yyerror("Assignment to both a list and a scalar");
2389 return FALSE;
2390 }
2391
11343788
MB		 2392 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
2393 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
2394 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 2395 return TRUE;
2396
11343788 2397 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 2398 return TRUE;
2399
11343788 2400 if (o->op_type == OP_RV2SV)
79072805
LW		 2401 return FALSE;
2402
2403 return FALSE;
2404}
2405
2406OP *
8ac85365 2407newASSIGNOP(I32 flags, OP *left, I32 optype, OP *right)
79072805 2408{
11343788 2409 OP *o;
79072805 2410
a0d0e21e
LW		 2411 if (optype) {
2412 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN) {
2413 return newLOGOP(optype, 0,
2414 mod(scalar(left), optype),
2415 newUNOP(OP_SASSIGN, 0, scalar(right)));
2416 }
2417 else {
2418 return newBINOP(optype, OPf_STACKED,
2419 mod(scalar(left), optype), scalar(right));
2420 }
2421 }
2422
79072805 2423 if (list_assignment(left)) {
463ee0b2 2424 modcount = 0;
748a9306 2425 eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 2426 left = mod(left, OP_AASSIGN);
748a9306
LW		 2427 if (eval_start)
2428 eval_start = 0;
2429 else {
a0d0e21e
LW		 2430 op_free(left);
2431 op_free(right);
2432 return Nullop;
2433 }
11343788 2434 o = newBINOP(OP_AASSIGN, flags,
8990e307
LW		 2435 list(force_list(right)),
2436 list(force_list(left)) );
11343788 2437 o->op_private = 0 | (flags >> 8);
a0d0e21e 2438 if (!(left->op_private & OPpLVAL_INTRO)) {
748a9306 2439 static int generation = 100;
79072805 2440 OP *curop;
11343788 2441 OP *lastop = o;
79072805 2442 generation++;
11343788 2443 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
79072805
LW		 2444 if (opargs[curop->op_type] & OA_DANGEROUS) {
2445 if (curop->op_type == OP_GV) {
2446 GV *gv = ((GVOP*)curop)->op_gv;
2447 if (gv == defgv || SvCUR(gv) == generation)
2448 break;
2449 SvCUR(gv) = generation;
2450 }
748a9306
LW		 2451 else if (curop->op_type == OP_PADSV ||
2452 curop->op_type == OP_PADAV ||
2453 curop->op_type == OP_PADHV ||
2454 curop->op_type == OP_PADANY) {
2455 SV **svp = AvARRAY(comppad_name);
8e07c86e 2456 SV *sv = svp[curop->op_targ];
748a9306
LW		 2457 if (SvCUR(sv) == generation)
2458 break;
2459 SvCUR(sv) = generation; /* (SvCUR not used any more) */
2460 }
79072805
LW		 2461 else if (curop->op_type == OP_RV2CV)
2462 break;
2463 else if (curop->op_type == OP_RV2SV ||
2464 curop->op_type == OP_RV2AV ||
2465 curop->op_type == OP_RV2HV ||
2466 curop->op_type == OP_RV2GV) {
2467 if (lastop->op_type != OP_GV) /* funny deref? */
2468 break;
2469 }
2470 else
2471 break;
2472 }
2473 lastop = curop;
2474 }
11343788
MB		 2475 if (curop != o)
2476 o->op_private = OPpASSIGN_COMMON;
79072805 2477 }
c07a80fd 2478 if (right && right->op_type == OP_SPLIT) {
2479 OP* tmpop;
2480 if ((tmpop = ((LISTOP*)right)->op_first) &&
2481 tmpop->op_type == OP_PUSHRE)
2482 {
2483 PMOP *pm = (PMOP*)tmpop;
2484 if (left->op_type == OP_RV2AV &&
2485 !(left->op_private & OPpLVAL_INTRO) &&
11343788 2486 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 2487 {
2488 tmpop = ((UNOP*)left)->op_first;
2489 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
2490 pm->op_pmreplroot = (OP*)((GVOP*)tmpop)->op_gv;
2491 pm->op_pmflags |= PMf_ONCE;
11343788 2492 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 2493 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
2494 tmpop->op_sibling = Nullop; /* don't free split */
2495 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 2496 op_free(o); /* blow off assign */
54310121 2497 right->op_flags &= ~OPf_WANT;
a5f75d66 2498 /* "I don't know and I don't care." */
c07a80fd 2499 return right;
2500 }
2501 }
2502 else {
2503 if (modcount < 10000 &&
2504 ((LISTOP*)right)->op_last->op_type == OP_CONST)
2505 {
2506 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
2507 if (SvIVX(sv) == 0)
2508 sv_setiv(sv, modcount+1);
2509 }
2510 }
2511 }
2512 }
11343788 2513 return o;
79072805
LW		 2514 }
2515 if (!right)
2516 right = newOP(OP_UNDEF, 0);
2517 if (right->op_type == OP_READLINE) {
2518 right->op_flags |= OPf_STACKED;
463ee0b2 2519 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 2520 }
a0d0e21e 2521 else {
748a9306 2522 eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 2523 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 2524 scalar(right), mod(scalar(left), OP_SASSIGN) );
748a9306
LW		 2525 if (eval_start)
2526 eval_start = 0;
2527 else {
11343788 2528 op_free(o);
a0d0e21e
LW		 2529 return Nullop;
2530 }
2531 }
11343788 2532 return o;
79072805
LW		 2533}
2534
2535OP *
8ac85365 2536newSTATEOP(I32 flags, char *label, OP *o)
79072805 2537{
11343788 2538 dTHR;
bbce6d69 2539 U32 seq = intro_my();
79072805
LW		 2540 register COP *cop;
2541
2542 Newz(1101, cop, 1, COP);
84902520 2543 if (PERLDB_LINE && curcop->cop_line && curstash != debstash) {
8990e307
LW		 2544 cop->op_type = OP_DBSTATE;
2545 cop->op_ppaddr = ppaddr[ OP_DBSTATE ];
2546 }
2547 else {
2548 cop->op_type = OP_NEXTSTATE;
2549 cop->op_ppaddr = ppaddr[ OP_NEXTSTATE ];
2550 }
79072805 2551 cop->op_flags = flags;
c07a80fd 2552 cop->op_private = 0 | (flags >> 8);
ff0cee69 2553#ifdef NATIVE_HINTS
2554 cop->op_private |= NATIVE_HINTS;
2555#endif
79072805
LW		 2556 cop->op_next = (OP*)cop;
2557
463ee0b2
LW		 2558 if (label) {
2559 cop->cop_label = label;
85e6fe83 2560 hints |= HINT_BLOCK_SCOPE;
463ee0b2 2561 }
bbce6d69 2562 cop->cop_seq = seq;
a0d0e21e 2563 cop->cop_arybase = curcop->cop_arybase;
79072805
LW		 2564
2565 if (copline == NOLINE)
2566 cop->cop_line = curcop->cop_line;
2567 else {
2568 cop->cop_line = copline;
2569 copline = NOLINE;
2570 }
44a8e56a 2571 cop->cop_filegv = (GV*)SvREFCNT_inc(curcop->cop_filegv);
79072805
LW		 2572 cop->cop_stash = curstash;
2573
84902520 2574 if (PERLDB_LINE && curstash != debstash) {
93a17b20
LW		 2575 SV **svp = av_fetch(GvAV(curcop->cop_filegv),(I32)cop->cop_line, FALSE);
2576 if (svp && *svp != &sv_undef && !SvIOK(*svp)) {
a0d0e21e 2577 (void)SvIOK_on(*svp);
a5f75d66 2578 SvIVX(*svp) = 1;
93a17b20
LW		 2579 SvSTASH(*svp) = (HV*)cop;
2580 }
2581 }
2582
11343788 2583 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 2584}
2585
bbce6d69 2586/* "Introduce" my variables to visible status. */
2587U32
8ac85365 2588intro_my(void)
bbce6d69 2589{
2590 SV **svp;
2591 SV *sv;
2592 I32 i;
2593
2594 if (! min_intro_pending)
2595 return cop_seqmax;
2596
2597 svp = AvARRAY(comppad_name);
2598 for (i = min_intro_pending; i <= max_intro_pending; i++) {
2599 if ((sv = svp[i]) && sv != &sv_undef && !SvIVX(sv)) {
2600 SvIVX(sv) = 999999999; /* Don't know scope end yet. */
2601 SvNVX(sv) = (double)cop_seqmax;
2602 }
2603 }
2604 min_intro_pending = 0;
2605 comppad_name_fill = max_intro_pending; /* Needn't search higher */
2606 return cop_seqmax++;
2607}
2608
79072805 2609OP *
8ac85365 2610newLOGOP(I32 type, I32 flags, OP *first, OP *other)
79072805 2611{
11343788 2612 dTHR;
79072805 2613 LOGOP *logop;
11343788 2614 OP *o;
79072805 2615
a0d0e21e
LW		 2616 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
2617 return newBINOP(type, flags, scalar(first), scalar(other));
2618
8990e307 2619 scalarboolean(first);
79072805
LW		 2620 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
2621 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
2622 if (type == OP_AND || type == OP_OR) {
2623 if (type == OP_AND)
2624 type = OP_OR;
2625 else
2626 type = OP_AND;
11343788
MB		 2627 o = first;
2628 first = cUNOPo->op_first;
2629 if (o->op_next)
2630 first->op_next = o->op_next;
2631 cUNOPo->op_first = Nullop;
2632 op_free(o);
79072805
LW		 2633 }
2634 }
2635 if (first->op_type == OP_CONST) {
93a17b20 2636 if (dowarn && (first->op_private & OPpCONST_BARE))
c07a80fd 2637 warn("Probable precedence problem on %s", op_desc[type]);
79072805
LW		 2638 if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
2639 op_free(first);
2640 return other;
2641 }
2642 else {
2643 op_free(other);
2644 return first;
2645 }
2646 }
2647 else if (first->op_type == OP_WANTARRAY) {
2648 if (type == OP_AND)
2649 list(other);
2650 else
2651 scalar(other);
2652 }
a6006777 2653 else if (dowarn && (first->op_flags & OPf_KIDS)) {
2654 OP *k1 = ((UNOP*)first)->op_first;
2655 OP *k2 = k1->op_sibling;
2656 OPCODE warnop = 0;
2657 switch (first->op_type)
2658 {
2659 case OP_NULL:
2660 if (k2 && k2->op_type == OP_READLINE
2661 && (k2->op_flags & OPf_STACKED)
2662 && (k1->op_type == OP_RV2SV || k1->op_type == OP_PADSV))
2663 warnop = k2->op_type;
2664 break;
2665
2666 case OP_SASSIGN:
68dc0745 2667 if (k1->op_type == OP_READDIR
2668 || k1->op_type == OP_GLOB
2669 || k1->op_type == OP_EACH)
a6006777 2670 warnop = k1->op_type;
2671 break;
2672 }
8ebc5c01 2673 if (warnop) {
2674 line_t oldline = curcop->cop_line;
2675 curcop->cop_line = copline;
68dc0745 2676 warn("Value of %s%s can be \"0\"; test with defined()",
2677 op_desc[warnop],
2678 ((warnop == OP_READLINE || warnop == OP_GLOB)
2679 ? " construct" : "() operator"));
2680 curcop->cop_line = oldline;
8ebc5c01 2681 }
a6006777 2682 }
79072805
LW		 2683
2684 if (!other)
2685 return first;
2686
a0d0e21e
LW		 2687 if (type == OP_ANDASSIGN || type == OP_ORASSIGN)
2688 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
2689
79072805
LW		 2690 Newz(1101, logop, 1, LOGOP);
2691
2692 logop->op_type = type;
2693 logop->op_ppaddr = ppaddr[type];
2694 logop->op_first = first;
2695 logop->op_flags = flags | OPf_KIDS;
2696 logop->op_other = LINKLIST(other);
c07a80fd 2697 logop->op_private = 1 | (flags >> 8);
79072805
LW		 2698
2699 /* establish postfix order */
2700 logop->op_next = LINKLIST(first);
2701 first->op_next = (OP*)logop;
2702 first->op_sibling = other;
2703
11343788
MB		 2704 o = newUNOP(OP_NULL, 0, (OP*)logop);
2705 other->op_next = o;
79072805 2706
11343788 2707 return o;
79072805
LW		 2708}
2709
2710OP *
8ac85365 2711newCONDOP(I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 2712{
11343788 2713 dTHR;
79072805 2714 CONDOP *condop;
11343788 2715 OP *o;
79072805 2716
b1cb66bf 2717 if (!falseop)
2718 return newLOGOP(OP_AND, 0, first, trueop);
2719 if (!trueop)
2720 return newLOGOP(OP_OR, 0, first, falseop);
79072805 2721
8990e307 2722 scalarboolean(first);
79072805
LW		 2723 if (first->op_type == OP_CONST) {
2724 if (SvTRUE(((SVOP*)first)->op_sv)) {
2725 op_free(first);
b1cb66bf 2726 op_free(falseop);
2727 return trueop;
79072805
LW		 2728 }
2729 else {
2730 op_free(first);
b1cb66bf 2731 op_free(trueop);
2732 return falseop;
79072805
LW		 2733 }
2734 }
2735 else if (first->op_type == OP_WANTARRAY) {
b1cb66bf 2736 list(trueop);
2737 scalar(falseop);
79072805
LW		 2738 }
2739 Newz(1101, condop, 1, CONDOP);
2740
2741 condop->op_type = OP_COND_EXPR;
2742 condop->op_ppaddr = ppaddr[OP_COND_EXPR];
2743 condop->op_first = first;
2744 condop->op_flags = flags | OPf_KIDS;
b1cb66bf 2745 condop->op_true = LINKLIST(trueop);
2746 condop->op_false = LINKLIST(falseop);
c07a80fd 2747 condop->op_private = 1 | (flags >> 8);
79072805
LW		 2748
2749 /* establish postfix order */
2750 condop->op_next = LINKLIST(first);
2751 first->op_next = (OP*)condop;
2752
b1cb66bf 2753 first->op_sibling = trueop;
2754 trueop->op_sibling = falseop;
11343788 2755 o = newUNOP(OP_NULL, 0, (OP*)condop);
79072805 2756
5dc0d613
MB		 2757 trueop->op_next = o;
2758 falseop->op_next = o;
79072805 2759
11343788 2760 return o;
79072805
LW		 2761}
2762
2763OP *
8ac85365 2764newRANGE(I32 flags, OP *left, OP *right)
79072805 2765{
b35b2403 2766 dTHR;
79072805
LW		 2767 CONDOP *condop;
2768 OP *flip;
2769 OP *flop;
11343788 2770 OP *o;
79072805
LW		 2771
2772 Newz(1101, condop, 1, CONDOP);
2773
2774 condop->op_type = OP_RANGE;
2775 condop->op_ppaddr = ppaddr[OP_RANGE];
2776 condop->op_first = left;
2777 condop->op_flags = OPf_KIDS;
2778 condop->op_true = LINKLIST(left);
2779 condop->op_false = LINKLIST(right);
c07a80fd 2780 condop->op_private = 1 | (flags >> 8);
79072805
LW		 2781
2782 left->op_sibling = right;
2783
2784 condop->op_next = (OP*)condop;
2785 flip = newUNOP(OP_FLIP, flags, (OP*)condop);
2786 flop = newUNOP(OP_FLOP, 0, flip);
11343788 2787 o = newUNOP(OP_NULL, 0, flop);
79072805
LW		 2788 linklist(flop);
2789
2790 left->op_next = flip;
2791 right->op_next = flop;
2792
ed6116ce 2793 condop->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805 2794 sv_upgrade(PAD_SV(condop->op_targ), SVt_PVNV);
ed6116ce 2795 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 2796 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
2797
2798 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
2799 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
2800
11343788 2801 flip->op_next = o;
79072805 2802 if (!flip->op_private || !flop->op_private)
11343788 2803 linklist(o); /* blow off optimizer unless constant */
79072805 2804
11343788 2805 return o;
79072805
LW		 2806}
2807
2808OP *
8ac85365 2809newLOOPOP(I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 2810{
11343788 2811 dTHR;
463ee0b2 2812 OP* listop;
11343788 2813 OP* o;
463ee0b2 2814 int once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 2815 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
93a17b20 2816
463ee0b2
LW		 2817 if (expr) {
2818 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
2819 return block; /* do {} while 0 does once */
fb73857a 2820 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
2821 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 2822 expr = newUNOP(OP_DEFINED, 0,
54b9620d 2823 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
774d564b 2824 }
463ee0b2 2825 }
93a17b20 2826
8990e307 2827 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
11343788 2828 o = newLOGOP(OP_AND, 0, expr, listop);
463ee0b2 2829
11343788 2830 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 2831
11343788
MB		 2832 if (once && o != listop)
2833 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 2834
11343788
MB		 2835 if (o == listop)
2836 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 2837
11343788
MB		 2838 o->op_flags |= flags;
2839 o = scope(o);
2840 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
2841 return o;
79072805
LW		 2842}
2843
2844OP *
8ac85365 2845newWHILEOP(I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *expr, OP *block, OP *cont)
79072805 2846{
11343788 2847 dTHR;
79072805
LW		 2848 OP *redo;
2849 OP *next = 0;
2850 OP *listop;
11343788 2851 OP *o;
79072805
LW		 2852 OP *condop;
2853
fb73857a 2854 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
2855 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB))) {
748a9306 2856 expr = newUNOP(OP_DEFINED, 0,
54b9620d 2857 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
748a9306 2858 }
79072805
LW		 2859
2860 if (!block)
2861 block = newOP(OP_NULL, 0);
2862
2863 if (cont)
2864 next = LINKLIST(cont);
fb73857a 2865 if (expr) {
79072805 2866 cont = append_elem(OP_LINESEQ, cont, newOP(OP_UNSTACK, 0));
fb73857a 2867 if ((line_t)whileline != NOLINE) {
2868 copline = whileline;
2869 cont = append_elem(OP_LINESEQ, cont,
2870 newSTATEOP(0, Nullch, Nullop));
2871 }
2872 }
79072805 2873
463ee0b2 2874 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 2875 redo = LINKLIST(listop);
2876
2877 if (expr) {
11343788
MB		 2878 o = newLOGOP(OP_AND, 0, expr, scalar(listop));
2879 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 2880 op_free(expr); /* oops, it's a while (0) */
463ee0b2
LW		 2881 op_free((OP*)loop);
2882 return Nullop; /* (listop already freed by newLOGOP) */
2883 }
aeea060c 2884 ((LISTOP*)listop)->op_last->op_next = condop =
11343788 2885 (o == listop ? redo : LINKLIST(o));
79072805
LW		 2886 if (!next)
2887 next = condop;
2888 }
2889 else
11343788 2890 o = listop;
79072805
LW		 2891
2892 if (!loop) {
2893 Newz(1101,loop,1,LOOP);
2894 loop->op_type = OP_ENTERLOOP;
2895 loop->op_ppaddr = ppaddr[OP_ENTERLOOP];
2896 loop->op_private = 0;
2897 loop->op_next = (OP*)loop;
2898 }
2899
11343788 2900 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 2901
2902 loop->op_redoop = redo;
11343788 2903 loop->op_lastop = o;
79072805
LW		 2904
2905 if (next)
2906 loop->op_nextop = next;
2907 else
11343788 2908 loop->op_nextop = o;
79072805 2909
11343788
MB		 2910 o->op_flags |= flags;
2911 o->op_private |= (flags >> 8);
2912 return o;
79072805
LW		 2913}
2914
2915OP *
a0d0e21e 2916#ifndef CAN_PROTOTYPE
79072805
LW		 2917newFOROP(flags,label,forline,sv,expr,block,cont)
2918I32 flags;
2919char *label;
2920line_t forline;
2921OP* sv;
2922OP* expr;
2923OP*block;
2924OP*cont;
8990e307
LW		 2925#else
2926newFOROP(I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *block,OP *cont)
a0d0e21e 2927#endif /* CAN_PROTOTYPE */
79072805
LW		 2928{
2929 LOOP *loop;
fb73857a 2930 OP *wop;
85e6fe83 2931 int padoff = 0;
4633a7c4 2932 I32 iterflags = 0;
79072805 2933
79072805 2934 if (sv) {
85e6fe83 2935 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
748a9306
LW		 2936 sv->op_type = OP_RV2GV;
2937 sv->op_ppaddr = ppaddr[OP_RV2GV];
79072805 2938 }
85e6fe83
LW		 2939 else if (sv->op_type == OP_PADSV) { /* private variable */
2940 padoff = sv->op_targ;
2941 op_free(sv);
2942 sv = Nullop;
2943 }
54b9620d
MB		 2944 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
2945 padoff = sv->op_targ;
2946 iterflags |= OPf_SPECIAL;
2947 op_free(sv);
2948 sv = Nullop;
2949 }
79072805 2950 else
c07a80fd 2951 croak("Can't use %s for loop variable", op_desc[sv->op_type]);
79072805
LW		 2952 }
2953 else {
54b9620d
MB		 2954#ifdef USE_THREADS
2955 padoff = find_threadsv("_");
2956 iterflags |= OPf_SPECIAL;
2957#else
79072805 2958 sv = newGVOP(OP_GV, 0, defgv);
54b9620d 2959#endif
79072805 2960 }
5f05dabc 2961 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
4633a7c4
LW		 2962 expr = scalar(ref(expr, OP_ITER));
2963 iterflags |= OPf_STACKED;
2964 }
2965 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
a0d0e21e
LW		 2966 append_elem(OP_LIST, mod(force_list(expr), OP_GREPSTART),
2967 scalar(sv))));
85e6fe83
LW		 2968 assert(!loop->op_next);
2969 Renew(loop, 1, LOOP);
2970 loop->op_targ = padoff;
fb73857a 2971 wop = newWHILEOP(flags, 1, loop, forline, newOP(OP_ITER, 0), block, cont);
2972 copline = forline;
2973 return newSTATEOP(0, label, wop);
79072805
LW		 2974}
2975
8990e307 2976OP*
8ac85365 2977newLOOPEX(I32 type, OP *label)
8990e307 2978{
11343788
MB		 2979 dTHR;
2980 OP *o;
8990e307 2981 if (type != OP_GOTO || label->op_type == OP_CONST) {
cdaebead
MB		 2982 /* "last()" means "last" */
2983 if (label->op_type == OP_STUB && (label->op_flags & OPf_PARENS))
2984 o = newOP(type, OPf_SPECIAL);
2985 else {
2986 o = newPVOP(type, 0, savepv(label->op_type == OP_CONST
2987 ? SvPVx(((SVOP*)label)->op_sv, na)
2988 : ""));
2989 }
8990e307
LW		 2990 op_free(label);
2991 }
2992 else {
a0d0e21e
LW		 2993 if (label->op_type == OP_ENTERSUB)
2994 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
11343788 2995 o = newUNOP(type, OPf_STACKED, label);
8990e307 2996 }
85e6fe83 2997 hints |= HINT_BLOCK_SCOPE;
11343788 2998 return o;
8990e307
LW		 2999}
3000
79072805 3001void
8ac85365 3002cv_undef(CV *cv)
79072805 3003{
11343788
MB		 3004 dTHR;
3005#ifdef USE_THREADS
e858de61
MB		 3006 if (CvMUTEXP(cv)) {
3007 MUTEX_DESTROY(CvMUTEXP(cv));
3008 Safefree(CvMUTEXP(cv));
3009 CvMUTEXP(cv) = 0;
3010 }
11343788
MB		 3011#endif /* USE_THREADS */
3012
a0d0e21e 3013 if (!CvXSUB(cv) && CvROOT(cv)) {
11343788
MB		 3014#ifdef USE_THREADS
3015 if (CvDEPTH(cv) || (CvOWNER(cv) && CvOWNER(cv) != thr))
3016 croak("Can't undef active subroutine");
3017#else
a0d0e21e
LW		 3018 if (CvDEPTH(cv))
3019 croak("Can't undef active subroutine");
11343788 3020#endif /* USE_THREADS */
8990e307 3021 ENTER;
a0d0e21e
LW		 3022
3023 SAVESPTR(curpad);
3024 curpad = 0;
3025
a5f75d66 3026 if (!CvCLONED(cv))
748a9306 3027 op_free(CvROOT(cv));
79072805 3028 CvROOT(cv) = Nullop;
8990e307 3029 LEAVE;
79072805 3030 }
1d5db326 3031 SvPOK_off((SV*)cv); /* forget prototype */
44a8e56a 3032 CvFLAGS(cv) = 0;
8e07c86e
AD		 3033 SvREFCNT_dec(CvGV(cv));
3034 CvGV(cv) = Nullgv;
3035 SvREFCNT_dec(CvOUTSIDE(cv));
3036 CvOUTSIDE(cv) = Nullcv;
3037 if (CvPADLIST(cv)) {
8ebc5c01 3038 /* may be during global destruction */
3039 if (SvREFCNT(CvPADLIST(cv))) {
93965878 3040 I32 i = AvFILLp(CvPADLIST(cv));
8ebc5c01 3041 while (i >= 0) {
3042 SV** svp = av_fetch(CvPADLIST(cv), i--, FALSE);
46fc3d4c 3043 SV* sv = svp ? *svp : Nullsv;
3044 if (!sv)
3045 continue;
3046 if (sv == (SV*)comppad_name)
3047 comppad_name = Nullav;
3048 else if (sv == (SV*)comppad) {
3049 comppad = Nullav;
3050 curpad = Null(SV**);
3051 }
3052 SvREFCNT_dec(sv);
8ebc5c01 3053 }
3054 SvREFCNT_dec((SV*)CvPADLIST(cv));
8e07c86e 3055 }
8e07c86e
AD		 3056 CvPADLIST(cv) = Nullav;
3057 }
79072805
LW		 3058}
3059
5f05dabc 3060#ifdef DEBUG_CLOSURES
3061static void
3062cv_dump(cv)
3063CV* cv;
3064{
3065 CV *outside = CvOUTSIDE(cv);
3066 AV* padlist = CvPADLIST(cv);
4fdae800 3067 AV* pad_name;
3068 AV* pad;
3069 SV** pname;
3070 SV** ppad;
5f05dabc 3071 I32 ix;
3072
fb73857a 3073 PerlIO_printf(Perl_debug_log, "\tCV=0x%lx (%s), OUTSIDE=0x%lx (%s)\n",
ab50184a
CS		 3074 cv,
3075 (CvANON(cv) ? "ANON"
3076 : (cv == main_cv) ? "MAIN"
07055b4c 3077 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 3078 : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
ab50184a
CS		 3079 outside,
3080 (!outside ? "null"
3081 : CvANON(outside) ? "ANON"
3082 : (outside == main_cv) ? "MAIN"
07055b4c 3083 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 3084 : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
5f05dabc 3085
4fdae800 3086 if (!padlist)
3087 return;
3088
3089 pad_name = (AV*)*av_fetch(padlist, 0, FALSE);
3090 pad = (AV*)*av_fetch(padlist, 1, FALSE);
3091 pname = AvARRAY(pad_name);
3092 ppad = AvARRAY(pad);
3093
93965878 3094 for (ix = 1; ix <= AvFILLp(pad_name); ix++) {
5f05dabc 3095 if (SvPOK(pname[ix]))
fb73857a 3096 PerlIO_printf(Perl_debug_log, "\t%4d. 0x%lx (%s\"%s\" %ld-%ld)\n",
4fdae800 3097 ix, ppad[ix],
3098 SvFAKE(pname[ix]) ? "FAKE " : "",
3099 SvPVX(pname[ix]),
ab50184a
CS		 3100 (long)I_32(SvNVX(pname[ix])),
3101 (long)SvIVX(pname[ix]));
5f05dabc 3102 }
3103}
3104#endif /* DEBUG_CLOSURES */
3105
3106static CV *
8ac85365 3107cv_clone2(CV *proto, CV *outside)
748a9306 3108{
11343788 3109 dTHR;
748a9306
LW		 3110 AV* av;
3111 I32 ix;
3112 AV* protopadlist = CvPADLIST(proto);
3113 AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE);
3114 AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE);
5f05dabc 3115 SV** pname = AvARRAY(protopad_name);
3116 SV** ppad = AvARRAY(protopad);
93965878
NIS		 3117 I32 fname = AvFILLp(protopad_name);
3118 I32 fpad = AvFILLp(protopad);
748a9306
LW		 3119 AV* comppadlist;
3120 CV* cv;
3121
07055b4c
CS		 3122 assert(!CvUNIQUE(proto));
3123
748a9306
LW		 3124 ENTER;
3125 SAVESPTR(curpad);
3126 SAVESPTR(comppad);
46fc3d4c 3127 SAVESPTR(comppad_name);
748a9306
LW		 3128 SAVESPTR(compcv);
3129
3130 cv = compcv = (CV*)NEWSV(1104,0);
fa83b5b6 3131 sv_upgrade((SV *)cv, SvTYPE(proto));
a5f75d66 3132 CvCLONED_on(cv);
5f05dabc 3133 if (CvANON(proto))
3134 CvANON_on(cv);
748a9306 3135
11343788 3136#ifdef USE_THREADS
12ca11f6 3137 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3138 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 3139 CvOWNER(cv) = 0;
3140#endif /* USE_THREADS */
748a9306 3141 CvFILEGV(cv) = CvFILEGV(proto);
44a8e56a 3142 CvGV(cv) = (GV*)SvREFCNT_inc(CvGV(proto));
748a9306
LW		 3143 CvSTASH(cv) = CvSTASH(proto);
3144 CvROOT(cv) = CvROOT(proto);
3145 CvSTART(cv) = CvSTART(proto);
5f05dabc 3146 if (outside)
3147 CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside);
748a9306 3148
68dc0745 3149 if (SvPOK(proto))
3150 sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto));
3151
46fc3d4c 3152 comppad_name = newAV();
3153 for (ix = fname; ix >= 0; ix--)
3154 av_store(comppad_name, ix, SvREFCNT_inc(pname[ix]));
748a9306
LW		 3155
3156 comppad = newAV();
3157
3158 comppadlist = newAV();
3159 AvREAL_off(comppadlist);
46fc3d4c 3160 av_store(comppadlist, 0, (SV*)comppad_name);
b355b4e0 3161 av_store(comppadlist, 1, (SV*)comppad);
748a9306 3162 CvPADLIST(cv) = comppadlist;
93965878 3163 av_fill(comppad, AvFILLp(protopad));
748a9306
LW		 3164 curpad = AvARRAY(comppad);
3165
3166 av = newAV(); /* will be @_ */
3167 av_extend(av, 0);
3168 av_store(comppad, 0, (SV*)av);
3169 AvFLAGS(av) = AVf_REIFY;
3170
9607fc9c 3171 for (ix = fpad; ix > 0; ix--) {
3172 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
aa689395 3173 if (namesv && namesv != &sv_undef) {
3174 char *name = SvPVX(namesv); /* XXX */
3175 if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */
3176 I32 off = pad_findlex(name, ix, SvIVX(namesv),
5f05dabc 3177 CvOUTSIDE(cv), cxstack_ix);
3178 if (!off)
3179 curpad[ix] = SvREFCNT_inc(ppad[ix]);
3180 else if (off != ix)
748a9306
LW		 3181 croak("panic: cv_clone: %s", name);
3182 }
3183 else { /* our own lexical */
aa689395 3184 SV* sv;
5f05dabc 3185 if (*name == '&') {
3186 /* anon code -- we'll come back for it */
3187 sv = SvREFCNT_inc(ppad[ix]);
3188 }
3189 else if (*name == '@')
3190 sv = (SV*)newAV();
748a9306 3191 else if (*name == '%')
5f05dabc 3192 sv = (SV*)newHV();
748a9306 3193 else
5f05dabc 3194 sv = NEWSV(0,0);
3195 if (!SvPADBUSY(sv))
3196 SvPADMY_on(sv);
3197 curpad[ix] = sv;
748a9306
LW		 3198 }
3199 }
3200 else {
aa689395 3201 SV* sv = NEWSV(0,0);
748a9306 3202 SvPADTMP_on(sv);
5f05dabc 3203 curpad[ix] = sv;
748a9306
LW		 3204 }
3205 }
3206
5f05dabc 3207 /* Now that vars are all in place, clone nested closures. */
3208
9607fc9c 3209 for (ix = fpad; ix > 0; ix--) {
3210 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
aa689395 3211 if (namesv
3212 && namesv != &sv_undef
3213 && !(SvFLAGS(namesv) & SVf_FAKE)
3214 && *SvPVX(namesv) == '&'
5f05dabc 3215 && CvCLONE(ppad[ix]))
3216 {
3217 CV *kid = cv_clone2((CV*)ppad[ix], cv);
3218 SvREFCNT_dec(ppad[ix]);
3219 CvCLONE_on(kid);
3220 SvPADMY_on(kid);
3221 curpad[ix] = (SV*)kid;
748a9306
LW		 3222 }
3223 }
3224
5f05dabc 3225#ifdef DEBUG_CLOSURES
ab50184a
CS		 3226 PerlIO_printf(Perl_debug_log, "Cloned inside:\n");
3227 cv_dump(outside);
3228 PerlIO_printf(Perl_debug_log, " from:\n");
5f05dabc 3229 cv_dump(proto);
ab50184a 3230 PerlIO_printf(Perl_debug_log, " to:\n");
5f05dabc 3231 cv_dump(cv);
3232#endif
3233
748a9306
LW		 3234 LEAVE;
3235 return cv;
3236}
3237
3238CV *
8ac85365 3239cv_clone(CV *proto)
5f05dabc 3240{
3241 return cv_clone2(proto, CvOUTSIDE(proto));
3242}
3243
3fe9a6f1 3244void
8ac85365 3245cv_ckproto(CV *cv, GV *gv, char *p)
3fe9a6f1 3246{
3247 if ((!p != !SvPOK(cv)) || (p && strNE(p, SvPVX(cv)))) {
46fc3d4c 3248 SV* msg = sv_newmortal();
3fe9a6f1 3249 SV* name = Nullsv;
3250
3251 if (gv)
46fc3d4c 3252 gv_efullname3(name = sv_newmortal(), gv, Nullch);
3253 sv_setpv(msg, "Prototype mismatch:");
3254 if (name)
fc36a67e 3255 sv_catpvf(msg, " sub %_", name);
3fe9a6f1 3256 if (SvPOK(cv))
46fc3d4c 3257 sv_catpvf(msg, " (%s)", SvPVX(cv));
3258 sv_catpv(msg, " vs ");
3259 if (p)
3260 sv_catpvf(msg, "(%s)", p);
3261 else
3262 sv_catpv(msg, "none");
fc36a67e 3263 warn("%_", msg);
3fe9a6f1 3264 }
3265}
3266
760ac839 3267SV *
8ac85365 3268cv_const_sv(CV *cv)
760ac839
LW		 3269{
3270 OP *o;
54310121 3271 SV *sv;
aeea060c 3272
54310121 3273 if (!cv || !SvPOK(cv) || SvCUR(cv))
3274 return Nullsv;
760ac839 3275
54310121 3276 sv = Nullsv;
3277 for (o = CvSTART(cv); o; o = o->op_next) {
3278 OPCODE type = o->op_type;
3279
3280 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
3281 continue;
3282 if (type == OP_LEAVESUB || type == OP_RETURN)
3283 break;
3284 if (sv)
3285 return Nullsv;
3286 if (type == OP_CONST)
5dc0d613 3287 sv = cSVOPo->op_sv;
54310121 3288 else if (type == OP_PADSV) {
e858de61
MB		 3289 AV* padav = (AV*)(AvARRAY(CvPADLIST(cv))[1]);
3290 sv = padav ? AvARRAY(padav)[o->op_targ] : Nullsv;
5aabfad6 3291 if (!sv || (!SvREADONLY(sv) && SvREFCNT(sv) > 1))
54310121 3292 return Nullsv;
760ac839 3293 }
54310121 3294 else
3295 return Nullsv;
760ac839 3296 }
5aabfad6 3297 if (sv)
3298 SvREADONLY_on(sv);
760ac839
LW		 3299 return sv;
3300}
3301
748a9306 3302CV *
8ac85365 3303newSUB(I32 floor, OP *o, OP *proto, OP *block)
79072805 3304{
11343788 3305 dTHR;
5dc0d613 3306 char *name = o ? SvPVx(cSVOPo->op_sv, na) : Nullch;
44a8e56a 3307 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
3fe9a6f1 3308 char *ps = proto ? SvPVx(((SVOP*)proto)->op_sv, na) : Nullch;
79072805 3309 register CV *cv;
a0d0e21e 3310 I32 ix;
79072805 3311
11343788 3312 if (o)
5dc0d613 3313 SAVEFREEOP(o);
3fe9a6f1 3314 if (proto)
3315 SAVEFREEOP(proto);
3316
68dc0745 3317 if (!name || GvCVGEN(gv))
3318 cv = Nullcv;
3319 else if (cv = GvCV(gv)) {
3fe9a6f1 3320 cv_ckproto(cv, gv, ps);
68dc0745 3321 /* already defined (or promised)? */
3322 if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
3323 SV* const_sv;
aa689395 3324 if (!block) {
3325 /* just a "sub foo;" when &foo is already defined */
3326 SAVEFREESV(compcv);
3327 goto done;
3328 }
7bac28a0 3329 /* ahem, death to those who redefine active sort subs */
3330 if (curstack == sortstack && sortcop == CvSTART(cv))
3331 croak("Can't redefine active sort subroutine %s", name);
68dc0745 3332 const_sv = cv_const_sv(cv);
44a8e56a 3333 if (const_sv || dowarn) {
79072805 3334 line_t oldline = curcop->cop_line;
79072805 3335 curcop->cop_line = copline;
760ac839 3336 warn(const_sv ? "Constant subroutine %s redefined"
68dc0745 3337 : "Subroutine %s redefined", name);
79072805
LW		 3338 curcop->cop_line = oldline;
3339 }
8990e307 3340 SvREFCNT_dec(cv);
68dc0745 3341 cv = Nullcv;
79072805
LW		 3342 }
3343 }
a0d0e21e 3344 if (cv) { /* must reuse cv if autoloaded */
4633a7c4 3345 cv_undef(cv);
44a8e56a 3346 CvFLAGS(cv) = CvFLAGS(compcv);
748a9306 3347 CvOUTSIDE(cv) = CvOUTSIDE(compcv);
e9a444f0 3348 CvOUTSIDE(compcv) = 0;
748a9306 3349 CvPADLIST(cv) = CvPADLIST(compcv);
4aa0a1f7 3350 CvPADLIST(compcv) = 0;
4633a7c4
LW		 3351 if (SvREFCNT(compcv) > 1) /* XXX Make closures transit through stub. */
3352 CvOUTSIDE(compcv) = (CV*)SvREFCNT_inc((SV*)cv);
748a9306 3353 SvREFCNT_dec(compcv);
a0d0e21e
LW		 3354 }
3355 else {
748a9306 3356 cv = compcv;
44a8e56a 3357 if (name) {
3358 GvCV(gv) = cv;
3359 GvCVGEN(gv) = 0;
3360 sub_generation++;
3361 }
a0d0e21e 3362 }
44a8e56a 3363 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
79072805 3364 CvFILEGV(cv) = curcop->cop_filegv;
8990e307 3365 CvSTASH(cv) = curstash;
11343788
MB		 3366#ifdef USE_THREADS
3367 CvOWNER(cv) = 0;
12ca11f6 3368 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3369 MUTEX_INIT(CvMUTEXP(cv));
11343788 3370#endif /* USE_THREADS */
8990e307 3371
3fe9a6f1 3372 if (ps)
3373 sv_setpv((SV*)cv, ps);
4633a7c4 3374
c07a80fd 3375 if (error_count) {
3376 op_free(block);
3377 block = Nullop;
68dc0745 3378 if (name) {
3379 char *s = strrchr(name, ':');
3380 s = s ? s+1 : name;
6d4c2119
CS		 3381 if (strEQ(s, "BEGIN")) {
3382 char *not_safe =
3383 "BEGIN not safe after errors--compilation aborted";
3384 if (in_eval & 4)
3385 croak(not_safe);
3386 else {
3387 /* force display of errors found but not reported */
38a03e6e
MB		 3388 sv_catpv(ERRSV, not_safe);
3389 croak("%s", SvPVx(ERRSV, na));
6d4c2119
CS		 3390 }
3391 }
68dc0745 3392 }
c07a80fd 3393 }
a0d0e21e 3394 if (!block) {
a0d0e21e
LW		 3395 copline = NOLINE;
3396 LEAVE_SCOPE(floor);
3397 return cv;
3398 }
3399
93965878
NIS		 3400 if (AvFILLp(comppad_name) < AvFILLp(comppad))
3401 av_store(comppad_name, AvFILLp(comppad), Nullsv);
a0d0e21e 3402
54310121 3403 if (CvCLONE(cv)) {
3404 SV **namep = AvARRAY(comppad_name);
93965878 3405 for (ix = AvFILLp(comppad); ix > 0; ix--) {
54310121 3406 SV *namesv;
3407
3408 if (SvIMMORTAL(curpad[ix]))
3409 continue;
3410 /*
3411 * The only things that a clonable function needs in its
3412 * pad are references to outer lexicals and anonymous subs.
3413 * The rest are created anew during cloning.
3414 */
3415 if (!((namesv = namep[ix]) != Nullsv &&
3416 namesv != &sv_undef &&
3417 (SvFAKE(namesv) ||
3418 *SvPVX(namesv) == '&')))
3419 {
3420 SvREFCNT_dec(curpad[ix]);
3421 curpad[ix] = Nullsv;
3422 }
3423 }
a0d0e21e 3424 }
54310121 3425 else {
3426 AV *av = newAV(); /* Will be @_ */
3427 av_extend(av, 0);
3428 av_store(comppad, 0, (SV*)av);
3429 AvFLAGS(av) = AVf_REIFY;
79072805 3430
93965878 3431 for (ix = AvFILLp(comppad); ix > 0; ix--) {
54310121 3432 if (SvIMMORTAL(curpad[ix]))
3433 continue;
3434 if (!SvPADMY(curpad[ix]))
3435 SvPADTMP_on(curpad[ix]);
3436 }
3437 }
79072805 3438
a0d0e21e 3439 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
79072805
LW		 3440 CvSTART(cv) = LINKLIST(CvROOT(cv));
3441 CvROOT(cv)->op_next = 0;
3442 peep(CvSTART(cv));
93a17b20 3443
44a8e56a 3444 if (name) {
3445 char *s;
3446
84902520 3447 if (PERLDB_SUBLINE && curstash != debstash) {
46fc3d4c 3448 SV *sv = NEWSV(0,0);
44a8e56a 3449 SV *tmpstr = sv_newmortal();
549bb64a 3450 GV *db_postponed = gv_fetchpv("DB::postponed", GV_ADDMULTI, SVt_PVHV);
44a8e56a 3451 CV *cv;
3452 HV *hv;
3453
51790459
MB		 3454 sv_setpvf(sv, "%_:%ld-%ld",
3455 GvSV(curcop->cop_filegv),
3456 (long)subline, (long)curcop->cop_line);
44a8e56a 3457 gv_efullname3(tmpstr, gv, Nullch);
3458 hv_store(GvHV(DBsub), SvPVX(tmpstr), SvCUR(tmpstr), sv, 0);
44a8e56a 3459 hv = GvHVn(db_postponed);
9607fc9c 3460 if (HvFILL(hv) > 0 && hv_exists(hv, SvPVX(tmpstr), SvCUR(tmpstr))
3461 && (cv = GvCV(db_postponed))) {
44a8e56a 3462 dSP;
3463 PUSHMARK(sp);
3464 XPUSHs(tmpstr);
3465 PUTBACK;
3466 perl_call_sv((SV*)cv, G_DISCARD);
3467 }
3468 }
79072805 3469
44a8e56a 3470 if ((s = strrchr(name,':')))
28757baa 3471 s++;
3472 else
3473 s = name;
68dc0745 3474 if (strEQ(s, "BEGIN")) {
2ae324a7 3475 I32 oldscope = scopestack_ix;
28757baa 3476 ENTER;
3477 SAVESPTR(compiling.cop_filegv);
3478 SAVEI16(compiling.cop_line);
3479 SAVEI32(perldb);
3480 save_svref(&rs);
3481 sv_setsv(rs, nrs);
3482
3483 if (!beginav)
3484 beginav = newAV();
3485 DEBUG_x( dump_sub(gv) );
3486 av_push(beginav, (SV *)cv);
3487 GvCV(gv) = 0;
68dc0745 3488 call_list(oldscope, beginav);
a6006777 3489
28757baa 3490 curcop = &compiling;
3491 LEAVE;
3492 }
3493 else if (strEQ(s, "END") && !error_count) {
3494 if (!endav)
3495 endav = newAV();
3496 av_unshift(endav, 1);
3497 av_store(endav, 0, (SV *)cv);
3498 GvCV(gv) = 0;
3499 }
7d07dbc2
MB		 3500 else if (strEQ(s, "INIT") && !error_count) {
3501 if (!initav)
3502 initav = newAV();
3503 av_push(initav, SvREFCNT_inc(cv));
ae77835f 3504 }
79072805 3505 }
a6006777 3506
aa689395 3507 done:
79072805 3508 copline = NOLINE;
8990e307 3509 LEAVE_SCOPE(floor);
a0d0e21e 3510 return cv;
79072805
LW		 3511}
3512
57d3b86d 3513CV *
aeea060c 3514newXS(char *name, void (*subaddr) (CV *), char *filename)
a0d0e21e 3515{
11343788 3516 dTHR;
44a8e56a 3517 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
79072805 3518 register CV *cv;
44a8e56a 3519
3520 if (cv = (name ? GvCV(gv) : Nullcv)) {
3521 if (GvCVGEN(gv)) {
3522 /* just a cached method */
3523 SvREFCNT_dec(cv);
3524 cv = 0;
3525 }
3526 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
3527 /* already defined (or promised) */
a0d0e21e
LW		 3528 if (dowarn) {
3529 line_t oldline = curcop->cop_line;
a0d0e21e
LW		 3530 curcop->cop_line = copline;
3531 warn("Subroutine %s redefined",name);
3532 curcop->cop_line = oldline;
3533 }
3534 SvREFCNT_dec(cv);
3535 cv = 0;
79072805 3536 }
79072805 3537 }
44a8e56a 3538
3539 if (cv) /* must reuse cv if autoloaded */
3540 cv_undef(cv);
a0d0e21e
LW		 3541 else {
3542 cv = (CV*)NEWSV(1105,0);
3543 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 3544 if (name) {
3545 GvCV(gv) = cv;
3546 GvCVGEN(gv) = 0;
3547 sub_generation++;
3548 }
a0d0e21e 3549 }
5196be3e 3550 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
11343788 3551#ifdef USE_THREADS
12ca11f6 3552 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3553 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 3554 CvOWNER(cv) = 0;
3555#endif /* USE_THREADS */
79072805 3556 CvFILEGV(cv) = gv_fetchfile(filename);
a0d0e21e 3557 CvXSUB(cv) = subaddr;
44a8e56a 3558
28757baa 3559 if (name) {
3560 char *s = strrchr(name,':');
3561 if (s)
3562 s++;
3563 else
3564 s = name;
3565 if (strEQ(s, "BEGIN")) {
3566 if (!beginav)
3567 beginav = newAV();
44a8e56a 3568 av_push(beginav, (SV *)cv);
3569 GvCV(gv) = 0;
28757baa 3570 }
3571 else if (strEQ(s, "END")) {
3572 if (!endav)
3573 endav = newAV();
3574 av_unshift(endav, 1);
44a8e56a 3575 av_store(endav, 0, (SV *)cv);
3576 GvCV(gv) = 0;
28757baa 3577 }
7d07dbc2
MB		 3578 else if (strEQ(s, "INIT")) {
3579 if (!initav)
3580 initav = newAV();
3581 av_push(initav, (SV *)cv);
ae77835f 3582 }
28757baa 3583 }
8990e307 3584 else
a5f75d66 3585 CvANON_on(cv);
44a8e56a 3586
a0d0e21e 3587 return cv;
79072805
LW		 3588}
3589
3590void
8ac85365 3591newFORM(I32 floor, OP *o, OP *block)
79072805 3592{
11343788 3593 dTHR;
79072805
LW		 3594 register CV *cv;
3595 char *name;
3596 GV *gv;
a0d0e21e 3597 I32 ix;
79072805 3598
11343788
MB		 3599 if (o)
3600 name = SvPVx(cSVOPo->op_sv, na);
79072805
LW		 3601 else
3602 name = "STDOUT";
85e6fe83 3603 gv = gv_fetchpv(name,TRUE, SVt_PVFM);
a5f75d66 3604 GvMULTI_on(gv);
79072805
LW		 3605 if (cv = GvFORM(gv)) {
3606 if (dowarn) {
3607 line_t oldline = curcop->cop_line;
3608
3609 curcop->cop_line = copline;
3610 warn("Format %s redefined",name);
3611 curcop->cop_line = oldline;
3612 }
8990e307 3613 SvREFCNT_dec(cv);
79072805 3614 }
748a9306 3615 cv = compcv;
79072805 3616 GvFORM(gv) = cv;
44a8e56a 3617 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
79072805
LW		 3618 CvFILEGV(cv) = curcop->cop_filegv;
3619
93965878 3620 for (ix = AvFILLp(comppad); ix > 0; ix--) {
44a8e56a 3621 if (!SvPADMY(curpad[ix]) && !SvIMMORTAL(curpad[ix]))
a0d0e21e
LW		 3622 SvPADTMP_on(curpad[ix]);
3623 }
3624
79072805
LW		 3625 CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
3626 CvSTART(cv) = LINKLIST(CvROOT(cv));
3627 CvROOT(cv)->op_next = 0;
3628 peep(CvSTART(cv));
11343788 3629 op_free(o);
79072805 3630 copline = NOLINE;
8990e307 3631 LEAVE_SCOPE(floor);
79072805
LW		 3632}
3633
3634OP *
8ac85365 3635newANONLIST(OP *o)
79072805 3636{
93a17b20 3637 return newUNOP(OP_REFGEN, 0,
11343788 3638 mod(list(convert(OP_ANONLIST, 0, o)), OP_REFGEN));
79072805
LW		 3639}
3640
3641OP *
8ac85365 3642newANONHASH(OP *o)
79072805 3643{
93a17b20 3644 return newUNOP(OP_REFGEN, 0,
11343788 3645 mod(list(convert(OP_ANONHASH, 0, o)), OP_REFGEN));
a0d0e21e
LW		 3646}
3647
3648OP *
8ac85365 3649newANONSUB(I32 floor, OP *proto, OP *block)
a0d0e21e
LW		 3650{
3651 return newUNOP(OP_REFGEN, 0,
4633a7c4 3652 newSVOP(OP_ANONCODE, 0, (SV*)newSUB(floor, 0, proto, block)));
79072805
LW		 3653}
3654
3655OP *
8ac85365 3656oopsAV(OP *o)
79072805 3657{
ed6116ce
LW		 3658 switch (o->op_type) {
3659 case OP_PADSV:
3660 o->op_type = OP_PADAV;
3661 o->op_ppaddr = ppaddr[OP_PADAV];
3662 return ref(newUNOP(OP_RV2AV, 0, scalar(o)), OP_RV2AV);
3663
3664 case OP_RV2SV:
79072805
LW		 3665 o->op_type = OP_RV2AV;
3666 o->op_ppaddr = ppaddr[OP_RV2AV];
3667 ref(o, OP_RV2AV);
ed6116ce
LW		 3668 break;
3669
3670 default:
79072805 3671 warn("oops: oopsAV");
ed6116ce
LW		 3672 break;
3673 }
79072805
LW		 3674 return o;
3675}
3676
3677OP *
8ac85365 3678oopsHV(OP *o)
79072805 3679{
ed6116ce
LW		 3680 switch (o->op_type) {
3681 case OP_PADSV:
3682 case OP_PADAV:
3683 o->op_type = OP_PADHV;
3684 o->op_ppaddr = ppaddr[OP_PADHV];
3685 return ref(newUNOP(OP_RV2HV, 0, scalar(o)), OP_RV2HV);
3686
3687 case OP_RV2SV:
3688 case OP_RV2AV:
79072805
LW		 3689 o->op_type = OP_RV2HV;
3690 o->op_ppaddr = ppaddr[OP_RV2HV];
3691 ref(o, OP_RV2HV);
ed6116ce
LW		 3692 break;
3693
3694 default:
79072805 3695 warn("oops: oopsHV");
ed6116ce
LW		 3696 break;
3697 }
79072805
LW		 3698 return o;
3699}
3700
3701OP *
8ac85365 3702newAVREF(OP *o)
79072805 3703{
ed6116ce
LW		 3704 if (o->op_type == OP_PADANY) {
3705 o->op_type = OP_PADAV;
3706 o->op_ppaddr = ppaddr[OP_PADAV];
93a17b20 3707 return o;
ed6116ce 3708 }
79072805
LW		 3709 return newUNOP(OP_RV2AV, 0, scalar(o));
3710}
3711
3712OP *
8ac85365 3713newGVREF(I32 type, OP *o)
79072805 3714{
a0d0e21e
LW		 3715 if (type == OP_MAPSTART)
3716 return newUNOP(OP_NULL, 0, o);
748a9306 3717 return ref(newUNOP(OP_RV2GV, OPf_REF, o), type);
79072805
LW		 3718}
3719
3720OP *
8ac85365 3721newHVREF(OP *o)
79072805 3722{
ed6116ce
LW		 3723 if (o->op_type == OP_PADANY) {
3724 o->op_type = OP_PADHV;
3725 o->op_ppaddr = ppaddr[OP_PADHV];
93a17b20 3726 return o;
ed6116ce 3727 }
79072805
LW		 3728 return newUNOP(OP_RV2HV, 0, scalar(o));
3729}
3730
3731OP *
8ac85365 3732oopsCV(OP *o)
79072805 3733{
463ee0b2 3734 croak("NOT IMPL LINE %d",__LINE__);
79072805
LW		 3735 /* STUB */
3736 return o;
3737}
3738
3739OP *
8ac85365 3740newCVREF(I32 flags, OP *o)
79072805 3741{
c07a80fd 3742 return newUNOP(OP_RV2CV, flags, scalar(o));
79072805
LW		 3743}
3744
3745OP *
8ac85365 3746newSVREF(OP *o)
79072805 3747{
ed6116ce
LW		 3748 if (o->op_type == OP_PADANY) {
3749 o->op_type = OP_PADSV;
3750 o->op_ppaddr = ppaddr[OP_PADSV];
93a17b20 3751 return o;
ed6116ce 3752 }
224a4551
MB		 3753 else if (o->op_type == OP_THREADSV && !(o->op_flags & OPpDONE_SVREF)) {
3754 o->op_flags |= OPpDONE_SVREF;
a863c7d1 3755 return o;
224a4551 3756 }
79072805
LW		 3757 return newUNOP(OP_RV2SV, 0, scalar(o));
3758}
3759
3760/* Check routines. */
3761
3762OP *
8ac85365 3763ck_anoncode(OP *o)
5f05dabc 3764{
178c6305
CS		 3765 PADOFFSET ix;
3766 SV* name;
3767
3768 name = NEWSV(1106,0);
3769 sv_upgrade(name, SVt_PVNV);
3770 sv_setpvn(name, "&", 1);
3771 SvIVX(name) = -1;
3772 SvNVX(name) = 1;
5dc0d613 3773 ix = pad_alloc(o->op_type, SVs_PADMY);
178c6305 3774 av_store(comppad_name, ix, name);
5dc0d613
MB		 3775 av_store(comppad, ix, cSVOPo->op_sv);
3776 SvPADMY_on(cSVOPo->op_sv);
3777 cSVOPo->op_sv = Nullsv;
3778 cSVOPo->op_targ = ix;
3779 return o;
5f05dabc 3780}
3781
3782OP *
8ac85365 3783ck_bitop(OP *o)
55497cff 3784{
5dc0d613
MB		 3785 o->op_private = hints;
3786 return o;
55497cff 3787}
3788
3789OP *
8ac85365 3790ck_concat(OP *o)
79072805 3791{
11343788
MB		 3792 if (cUNOPo->op_first->op_type == OP_CONCAT)
3793 o->op_flags |= OPf_STACKED;
3794 return o;
79072805
LW		 3795}
3796
3797OP *
8ac85365 3798ck_spair(OP *o)
79072805 3799{
11343788 3800 if (o->op_flags & OPf_KIDS) {
79072805 3801 OP* newop;
a0d0e21e 3802 OP* kid;
5dc0d613
MB		 3803 OPCODE type = o->op_type;
3804 o = modkids(ck_fun(o), type);
11343788 3805 kid = cUNOPo->op_first;
a0d0e21e
LW		 3806 newop = kUNOP->op_first->op_sibling;
3807 if (newop &&
3808 (newop->op_sibling ||
3809 !(opargs[newop->op_type] & OA_RETSCALAR) ||
3810 newop->op_type == OP_PADAV || newop->op_type == OP_PADHV ||
3811 newop->op_type == OP_RV2AV || newop->op_type == OP_RV2HV)) {
aeea060c 3812
11343788 3813 return o;
a0d0e21e
LW		 3814 }
3815 op_free(kUNOP->op_first);
3816 kUNOP->op_first = newop;
3817 }
11343788
MB		 3818 o->op_ppaddr = ppaddr[++o->op_type];
3819 return ck_fun(o);
a0d0e21e
LW		 3820}
3821
3822OP *
8ac85365 3823ck_delete(OP *o)
a0d0e21e 3824{
11343788 3825 o = ck_fun(o);
5dc0d613 3826 o->op_private = 0;
11343788
MB		 3827 if (o->op_flags & OPf_KIDS) {
3828 OP *kid = cUNOPo->op_first;
5f05dabc 3829 if (kid->op_type == OP_HSLICE)
5dc0d613 3830 o->op_private |= OPpSLICE;
5f05dabc 3831 else if (kid->op_type != OP_HELEM)
3832 croak("%s argument is not a HASH element or slice",
5dc0d613 3833 op_desc[o->op_type]);
a0d0e21e 3834 null(kid);
79072805 3835 }
11343788 3836 return o;
79072805
LW		 3837}
3838
3839OP *
8ac85365 3840ck_eof(OP *o)
79072805 3841{
11343788 3842 I32 type = o->op_type;
79072805 3843
11343788
MB		 3844 if (o->op_flags & OPf_KIDS) {
3845 if (cLISTOPo->op_first->op_type == OP_STUB) {
3846 op_free(o);
3847 o = newUNOP(type, OPf_SPECIAL,
d58bf5aa 3848 newGVOP(OP_GV, 0, gv_fetchpv("main::ARGV", TRUE, SVt_PVAV)));
8990e307 3849 }
11343788 3850 return ck_fun(o);
79072805 3851 }
11343788 3852 return o;
79072805
LW		 3853}
3854
3855OP *
8ac85365 3856ck_eval(OP *o)
79072805 3857{
85e6fe83 3858 hints |= HINT_BLOCK_SCOPE;
11343788
MB		 3859 if (o->op_flags & OPf_KIDS) {
3860 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 3861
93a17b20 3862 if (!kid) {
11343788
MB		 3863 o->op_flags &= ~OPf_KIDS;
3864 null(o);
79072805
LW		 3865 }
3866 else if (kid->op_type == OP_LINESEQ) {
3867 LOGOP *enter;
3868
11343788
MB		 3869 kid->op_next = o->op_next;
3870 cUNOPo->op_first = 0;
3871 op_free(o);
79072805
LW		 3872
3873 Newz(1101, enter, 1, LOGOP);
3874 enter->op_type = OP_ENTERTRY;
3875 enter->op_ppaddr = ppaddr[OP_ENTERTRY];
3876 enter->op_private = 0;
3877
3878 /* establish postfix order */
3879 enter->op_next = (OP*)enter;
3880
11343788
MB		 3881 o = prepend_elem(OP_LINESEQ, (OP*)enter, (OP*)kid);
3882 o->op_type = OP_LEAVETRY;
3883 o->op_ppaddr = ppaddr[OP_LEAVETRY];
3884 enter->op_other = o;
3885 return o;
79072805 3886 }
c7cc6f1c 3887 else
473986ff 3888 scalar((OP*)kid);
79072805
LW		 3889 }
3890 else {
11343788 3891 op_free(o);
54b9620d 3892 o = newUNOP(OP_ENTEREVAL, 0, newDEFSVOP());
79072805 3893 }
11343788
MB		 3894 o->op_targ = (PADOFFSET)hints;
3895 return o;
79072805
LW		 3896}
3897
3898OP *
8ac85365 3899ck_exec(OP *o)
79072805
LW		 3900{
3901 OP *kid;
11343788
MB		 3902 if (o->op_flags & OPf_STACKED) {
3903 o = ck_fun(o);
3904 kid = cUNOPo->op_first->op_sibling;
8990e307
LW		 3905 if (kid->op_type == OP_RV2GV)
3906 null(kid);
79072805 3907 }
463ee0b2 3908 else
11343788
MB		 3909 o = listkids(o);
3910 return o;
79072805
LW		 3911}
3912
3913OP *
8ac85365 3914ck_exists(OP *o)
5f05dabc 3915{
5196be3e
MB		 3916 o = ck_fun(o);
3917 if (o->op_flags & OPf_KIDS) {
3918 OP *kid = cUNOPo->op_first;
5f05dabc 3919 if (kid->op_type != OP_HELEM)
5196be3e 3920 croak("%s argument is not a HASH element", op_desc[o->op_type]);
5f05dabc 3921 null(kid);
3922 }
5196be3e 3923 return o;
5f05dabc 3924}
3925
3926OP *
8ac85365 3927ck_gvconst(register OP *o)
79072805
LW		 3928{
3929 o = fold_constants(o);
3930 if (o->op_type == OP_CONST)
3931 o->op_type = OP_GV;
3932 return o;
3933}
3934
3935OP *
8ac85365 3936ck_rvconst(register OP *o)
79072805 3937{
11343788
MB		 3938 dTHR;
3939 SVOP *kid = (SVOP*)cUNOPo->op_first;
85e6fe83 3940
11343788 3941 o->op_private |= (hints & HINT_STRICT_REFS);
79072805 3942 if (kid->op_type == OP_CONST) {
44a8e56a 3943 char *name;
3944 int iscv;
3945 GV *gv;
3946
3947 name = SvPV(kid->op_sv, na);
3948 if ((hints & HINT_STRICT_REFS) && (kid->op_private & OPpCONST_BARE)) {
3949 char *badthing = Nullch;
5dc0d613 3950 switch (o->op_type) {
44a8e56a 3951 case OP_RV2SV:
3952 badthing = "a SCALAR";
3953 break;
3954 case OP_RV2AV:
3955 badthing = "an ARRAY";
3956 break;
3957 case OP_RV2HV:
3958 badthing = "a HASH";
3959 break;
3960 }
3961 if (badthing)
3962 croak(
3963 "Can't use bareword (\"%s\") as %s ref while \"strict refs\" in use",
3964 name, badthing);
3965 }
79072805 3966 kid->op_type = OP_GV;
5196be3e 3967 iscv = (o->op_type == OP_RV2CV) * 2;
a0d0e21e 3968 for (gv = 0; !gv; iscv++) {
748a9306
LW		 3969 /*
3970 * This is a little tricky. We only want to add the symbol if we
3971 * didn't add it in the lexer. Otherwise we get duplicate strict
3972 * warnings. But if we didn't add it in the lexer, we must at
3973 * least pretend like we wanted to add it even if it existed before,
3974 * or we get possible typo warnings. OPpCONST_ENTERED says
3975 * whether the lexer already added THIS instance of this symbol.
3976 */
44a8e56a 3977 gv = gv_fetchpv(name,
748a9306 3978 iscv | !(kid->op_private & OPpCONST_ENTERED),
a0d0e21e
LW		 3979 iscv
3980 ? SVt_PVCV
11343788 3981 : o->op_type == OP_RV2SV
a0d0e21e 3982 ? SVt_PV
11343788 3983 : o->op_type == OP_RV2AV
a0d0e21e 3984 ? SVt_PVAV
11343788 3985 : o->op_type == OP_RV2HV
a0d0e21e
LW		 3986 ? SVt_PVHV
3987 : SVt_PVGV);
3988 }
adbc6bb1 3989 SvREFCNT_dec(kid->op_sv);
a0d0e21e 3990 kid->op_sv = SvREFCNT_inc(gv);
79072805 3991 }
11343788 3992 return o;
79072805
LW		 3993}
3994
3995OP *
8ac85365 3996ck_ftst(OP *o)
79072805 3997{
11343788
MB		 3998 dTHR;
3999 I32 type = o->op_type;
79072805 4000
11343788
MB		 4001 if (o->op_flags & OPf_REF)
4002 return o;
79072805 4003
11343788
MB		 4004 if (o->op_flags & OPf_KIDS) {
4005 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805
LW		 4006
4007 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
a0d0e21e 4008 OP *newop = newGVOP(type, OPf_REF,
85e6fe83 4009 gv_fetchpv(SvPVx(kid->op_sv, na), TRUE, SVt_PVIO));
11343788 4010 op_free(o);
79072805
LW		 4011 return newop;
4012 }
4013 }
4014 else {
11343788 4015 op_free(o);
79072805 4016 if (type == OP_FTTTY)
fb73857a 4017 return newGVOP(type, OPf_REF, gv_fetchpv("main::STDIN", TRUE,
85e6fe83 4018 SVt_PVIO));
79072805 4019 else
54b9620d 4020 return newUNOP(type, 0, newDEFSVOP());
79072805 4021 }
11343788 4022 return o;
79072805
LW		 4023}
4024
4025OP *
8ac85365 4026ck_fun(OP *o)
79072805 4027{
11343788 4028 dTHR;
79072805
LW		 4029 register OP *kid;
4030 OP **tokid;
4031 OP *sibl;
4032 I32 numargs = 0;
11343788 4033 int type = o->op_type;
a0d0e21e 4034 register I32 oa = opargs[type] >> OASHIFT;
aeea060c 4035
11343788 4036 if (o->op_flags & OPf_STACKED) {
79072805
LW		 4037 if ((oa & OA_OPTIONAL) && (oa >> 4) && !((oa >> 4) & OA_OPTIONAL))
4038 oa &= ~OA_OPTIONAL;
4039 else
11343788 4040 return no_fh_allowed(o);
79072805
LW		 4041 }
4042
11343788
MB		 4043 if (o->op_flags & OPf_KIDS) {
4044 tokid = &cLISTOPo->op_first;
4045 kid = cLISTOPo->op_first;
8990e307
LW		 4046 if (kid->op_type == OP_PUSHMARK ||
4047 kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK)
4048 {
79072805
LW		 4049 tokid = &kid->op_sibling;
4050 kid = kid->op_sibling;
4051 }
a0d0e21e 4052 if (!kid && opargs[type] & OA_DEFGV)
54b9620d 4053 *tokid = kid = newDEFSVOP();
79072805
LW		 4054
4055 while (oa && kid) {
4056 numargs++;
4057 sibl = kid->op_sibling;
4058 switch (oa & 7) {
4059 case OA_SCALAR:
4060 scalar(kid);
4061 break;
4062 case OA_LIST:
4063 if (oa < 16) {
4064 kid = 0;
4065 continue;
4066 }
4067 else
4068 list(kid);
4069 break;
4070 case OA_AVREF:
4071 if (kid->op_type == OP_CONST &&
4072 (kid->op_private & OPpCONST_BARE)) {
463ee0b2 4073 char *name = SvPVx(((SVOP*)kid)->op_sv, na);
79072805 4074 OP *newop = newAVREF(newGVOP(OP_GV, 0,
85e6fe83 4075 gv_fetchpv(name, TRUE, SVt_PVAV) ));
463ee0b2 4076 if (dowarn)
ff0cee69 4077 warn("Array @%s missing the @ in argument %ld of %s()",
4078 name, (long)numargs, op_desc[type]);
79072805
LW		 4079 op_free(kid);
4080 kid = newop;
4081 kid->op_sibling = sibl;
4082 *tokid = kid;
4083 }
8990e307 4084 else if (kid->op_type != OP_RV2AV && kid->op_type != OP_PADAV)
11343788 4085 bad_type(numargs, "array", op_desc[o->op_type], kid);
a0d0e21e 4086 mod(kid, type);
79072805
LW		 4087 break;
4088 case OA_HVREF:
4089 if (kid->op_type == OP_CONST &&
4090 (kid->op_private & OPpCONST_BARE)) {
463ee0b2 4091 char *name = SvPVx(((SVOP*)kid)->op_sv, na);
79072805 4092 OP *newop = newHVREF(newGVOP(OP_GV, 0,
85e6fe83 4093 gv_fetchpv(name, TRUE, SVt_PVHV) ));
463ee0b2 4094 if (dowarn)
ff0cee69 4095 warn("Hash %%%s missing the %% in argument %ld of %s()",
4096 name, (long)numargs, op_desc[type]);
79072805
LW		 4097 op_free(kid);
4098 kid = newop;
4099 kid->op_sibling = sibl;
4100 *tokid = kid;
4101 }
8990e307 4102 else if (kid->op_type != OP_RV2HV && kid->op_type != OP_PADHV)
11343788 4103 bad_type(numargs, "hash", op_desc[o->op_type], kid);
a0d0e21e 4104 mod(kid, type);
79072805
LW		 4105 break;
4106 case OA_CVREF:
4107 {
a0d0e21e 4108 OP *newop = newUNOP(OP_NULL, 0, kid);
79072805
LW		 4109 kid->op_sibling = 0;
4110 linklist(kid);
4111 newop->op_next = newop;
4112 kid = newop;
4113 kid->op_sibling = sibl;
4114 *tokid = kid;
4115 }
4116 break;
4117 case OA_FILEREF:
4118 if (kid->op_type != OP_GV) {
4119 if (kid->op_type == OP_CONST &&
4120 (kid->op_private & OPpCONST_BARE)) {
4121 OP *newop = newGVOP(OP_GV, 0,
85e6fe83
LW		 4122 gv_fetchpv(SvPVx(((SVOP*)kid)->op_sv, na), TRUE,
4123 SVt_PVIO) );
79072805
LW		 4124 op_free(kid);
4125 kid = newop;
4126 }
4127 else {
4128 kid->op_sibling = 0;
4129 kid = newUNOP(OP_RV2GV, 0, scalar(kid));
4130 }
4131 kid->op_sibling = sibl;
4132 *tokid = kid;
4133 }
4134 scalar(kid);
4135 break;
4136 case OA_SCALARREF:
a0d0e21e 4137 mod(scalar(kid), type);
79072805
LW		 4138 break;
4139 }
4140 oa >>= 4;
4141 tokid = &kid->op_sibling;
4142 kid = kid->op_sibling;
4143 }
11343788 4144 o->op_private |= numargs;
79072805 4145 if (kid)
11343788
MB		 4146 return too_many_arguments(o,op_desc[o->op_type]);
4147 listkids(o);
79072805 4148 }
a0d0e21e 4149 else if (opargs[type] & OA_DEFGV) {
11343788 4150 op_free(o);
54b9620d 4151 return newUNOP(type, 0, newDEFSVOP());
a0d0e21e
LW		 4152 }
4153
79072805
LW		 4154 if (oa) {
4155 while (oa & OA_OPTIONAL)
4156 oa >>= 4;
4157 if (oa && oa != OA_LIST)
11343788 4158 return too_few_arguments(o,op_desc[o->op_type]);
79072805 4159 }
11343788 4160 return o;
79072805
LW		 4161}
4162
4163OP *
8ac85365 4164ck_glob(OP *o)
79072805 4165{
fb73857a 4166 GV *gv;
4167
1f2bfc8a 4168 if ((o->op_flags & OPf_KIDS) && !cLISTOPo->op_first->op_sibling)
54b9620d 4169 append_elem(OP_GLOB, o, newDEFSVOP());
fb73857a 4170
4171 if (!((gv = gv_fetchpv("glob", FALSE, SVt_PVCV)) && GvIMPORTED_CV(gv)))
4172 gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
b1cb66bf 4173
4174 if (gv && GvIMPORTED_CV(gv)) {
46fc3d4c 4175 static int glob_index;
4176
5196be3e 4177 append_elem(OP_GLOB, o,
46fc3d4c 4178 newSVOP(OP_CONST, 0, newSViv(glob_index++)));
1f2bfc8a
MB		 4179 o->op_type = OP_LIST;
4180 o->op_ppaddr = ppaddr[OP_LIST];
4181 cLISTOPo->op_first->op_type = OP_PUSHMARK;
4182 cLISTOPo->op_first->op_ppaddr = ppaddr[OP_PUSHMARK];
4183 o = newUNOP(OP_ENTERSUB, OPf_STACKED,
aeea060c 4184 append_elem(OP_LIST, o,
1f2bfc8a
MB		 4185 scalar(newUNOP(OP_RV2CV, 0,
4186 newGVOP(OP_GV, 0, gv)))));
d58bf5aa
MB		 4187 o = newUNOP(OP_NULL, 0, ck_subr(o));
4188 o->op_targ = OP_GLOB; /* hint at what it used to be */
4189 return o;
b1cb66bf 4190 }
4191 gv = newGVgen("main");
a0d0e21e 4192 gv_IOadd(gv);
11343788
MB		 4193 append_elem(OP_GLOB, o, newGVOP(OP_GV, 0, gv));
4194 scalarkids(o);
4195 return ck_fun(o);
79072805
LW		 4196}
4197
4198OP *
8ac85365 4199ck_grep(OP *o)
79072805
LW		 4200{
4201 LOGOP *gwop;
4202 OP *kid;
11343788 4203 OPCODE type = o->op_type == OP_GREPSTART ? OP_GREPWHILE : OP_MAPWHILE;
79072805 4204
11343788 4205 o->op_ppaddr = ppaddr[OP_GREPSTART];
a0d0e21e 4206 Newz(1101, gwop, 1, LOGOP);
aeea060c 4207
11343788 4208 if (o->op_flags & OPf_STACKED) {
a0d0e21e 4209 OP* k;
11343788
MB		 4210 o = ck_sort(o);
4211 kid = cLISTOPo->op_first->op_sibling;
4212 for (k = cLISTOPo->op_first->op_sibling->op_next; k; k = k->op_next) {
a0d0e21e
LW		 4213 kid = k;
4214 }
4215 kid->op_next = (OP*)gwop;
11343788 4216 o->op_flags &= ~OPf_STACKED;
93a17b20 4217 }
11343788 4218 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e
LW		 4219 if (type == OP_MAPWHILE)
4220 list(kid);
4221 else
4222 scalar(kid);
11343788 4223 o = ck_fun(o);
79072805 4224 if (error_count)
11343788 4225 return o;
aeea060c 4226 kid = cLISTOPo->op_first->op_sibling;
79072805 4227 if (kid->op_type != OP_NULL)
463ee0b2 4228 croak("panic: ck_grep");
79072805
LW		 4229 kid = kUNOP->op_first;
4230
a0d0e21e
LW		 4231 gwop->op_type = type;
4232 gwop->op_ppaddr = ppaddr[type];
11343788 4233 gwop->op_first = listkids(o);
79072805
LW		 4234 gwop->op_flags |= OPf_KIDS;
4235 gwop->op_private = 1;
4236 gwop->op_other = LINKLIST(kid);
a0d0e21e 4237 gwop->op_targ = pad_alloc(type, SVs_PADTMP);
79072805
LW		 4238 kid->op_next = (OP*)gwop;
4239
11343788 4240 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e 4241 if (!kid || !kid->op_sibling)
11343788 4242 return too_few_arguments(o,op_desc[o->op_type]);
a0d0e21e
LW		 4243 for (kid = kid->op_sibling; kid; kid = kid->op_sibling)
4244 mod(kid, OP_GREPSTART);
4245
79072805
LW		 4246 return (OP*)gwop;
4247}
4248
4249OP *
8ac85365 4250ck_index(OP *o)
79072805 4251{
11343788
MB		 4252 if (o->op_flags & OPf_KIDS) {
4253 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
79072805 4254 if (kid && kid->op_type == OP_CONST)
bbce6d69 4255 fbm_compile(((SVOP*)kid)->op_sv);
79072805 4256 }
11343788 4257 return ck_fun(o);
79072805
LW		 4258}
4259
4260OP *
8ac85365 4261ck_lengthconst(OP *o)
79072805
LW		 4262{
4263 /* XXX length optimization goes here */
11343788 4264 return ck_fun(o);
79072805
LW		 4265}
4266
4267OP *
8ac85365 4268ck_lfun(OP *o)
79072805 4269{
5dc0d613
MB		 4270 OPCODE type = o->op_type;
4271 return modkids(ck_fun(o), type);
79072805
LW		 4272}
4273
4274OP *
8ac85365 4275ck_rfun(OP *o)
8990e307 4276{
5dc0d613
MB		 4277 OPCODE type = o->op_type;
4278 return refkids(ck_fun(o), type);
8990e307
LW		 4279}
4280
4281OP *
8ac85365 4282ck_listiob(OP *o)
79072805
LW		 4283{
4284 register OP *kid;
aeea060c 4285
11343788 4286 kid = cLISTOPo->op_first;
79072805 4287 if (!kid) {
11343788
MB		 4288 o = force_list(o);
4289 kid = cLISTOPo->op_first;
79072805
LW		 4290 }
4291 if (kid->op_type == OP_PUSHMARK)
4292 kid = kid->op_sibling;
11343788 4293 if (kid && o->op_flags & OPf_STACKED)
79072805
LW		 4294 kid = kid->op_sibling;
4295 else if (kid && !kid->op_sibling) { /* print HANDLE; */
4296 if (kid->op_type == OP_CONST && kid->op_private & OPpCONST_BARE) {
11343788 4297 o->op_flags |= OPf_STACKED; /* make it a filehandle */
748a9306 4298 kid = newUNOP(OP_RV2GV, OPf_REF, scalar(kid));
11343788
MB		 4299 cLISTOPo->op_first->op_sibling = kid;
4300 cLISTOPo->op_last = kid;
79072805
LW		 4301 kid = kid->op_sibling;
4302 }
4303 }
4304
4305 if (!kid)
54b9620d 4306 append_elem(o->op_type, o, newDEFSVOP());
79072805 4307
5dc0d613 4308 o = listkids(o);
bbce6d69 4309
5dc0d613 4310 o->op_private = 0;
36477c24 4311#ifdef USE_LOCALE
bbce6d69 4312 if (hints & HINT_LOCALE)
5dc0d613 4313 o->op_private |= OPpLOCALE;
bbce6d69 4314#endif
4315
5dc0d613 4316 return o;
bbce6d69 4317}
4318
4319OP *
8ac85365 4320ck_fun_locale(OP *o)
bbce6d69 4321{
5dc0d613 4322 o = ck_fun(o);
bbce6d69 4323
5dc0d613 4324 o->op_private = 0;
36477c24 4325#ifdef USE_LOCALE
bbce6d69 4326 if (hints & HINT_LOCALE)
5dc0d613 4327 o->op_private |= OPpLOCALE;
bbce6d69 4328#endif
4329
5dc0d613 4330 return o;
bbce6d69 4331}
4332
4333OP *
8ac85365 4334ck_scmp(OP *o)
bbce6d69 4335{
5dc0d613 4336 o->op_private = 0;
36477c24 4337#ifdef USE_LOCALE
bbce6d69 4338 if (hints & HINT_LOCALE)
5dc0d613 4339 o->op_private |= OPpLOCALE;
bbce6d69 4340#endif
36477c24 4341
5dc0d613 4342 return o;
79072805
LW		 4343}
4344
4345OP *
8ac85365 4346ck_match(OP *o)
79072805 4347{
5dc0d613 4348 o->op_private |= OPpRUNTIME;
11343788 4349 return o;
79072805
LW		 4350}
4351
4352OP *
8ac85365 4353ck_null(OP *o)
79072805 4354{
11343788 4355 return o;
79072805
LW		 4356}
4357
4358OP *
8ac85365 4359ck_repeat(OP *o)
79072805 4360{
11343788
MB		 4361 if (cBINOPo->op_first->op_flags & OPf_PARENS) {
4362 o->op_private |= OPpREPEAT_DOLIST;
4363 cBINOPo->op_first = force_list(cBINOPo->op_first);
79072805
LW		 4364 }
4365 else
11343788
MB		 4366 scalar(o);
4367 return o;
79072805
LW		 4368}
4369
4370OP *
8ac85365 4371ck_require(OP *o)
8990e307 4372{
11343788
MB		 4373 if (o->op_flags & OPf_KIDS) { /* Shall we supply missing .pm? */
4374 SVOP *kid = (SVOP*)cUNOPo->op_first;
8990e307
LW		 4375
4376 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
8990e307 4377 char *s;
a0d0e21e
LW		 4378 for (s = SvPVX(kid->op_sv); *s; s++) {
4379 if (*s == ':' && s[1] == ':') {
4380 *s = '/';
1aef975c 4381 Move(s+2, s+1, strlen(s+2)+1, char);
a0d0e21e
LW		 4382 --SvCUR(kid->op_sv);
4383 }
8990e307 4384 }
a0d0e21e 4385 sv_catpvn(kid->op_sv, ".pm", 3);
8990e307
LW		 4386 }
4387 }
11343788 4388 return ck_fun(o);
8990e307
LW		 4389}
4390
4391OP *
8ac85365 4392ck_retarget(OP *o)
79072805 4393{
463ee0b2 4394 croak("NOT IMPL LINE %d",__LINE__);
79072805 4395 /* STUB */
11343788 4396 return o;
79072805
LW		 4397}
4398
4399OP *
8ac85365 4400ck_select(OP *o)
79072805 4401{
c07a80fd 4402 OP* kid;
11343788
MB		 4403 if (o->op_flags & OPf_KIDS) {
4404 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
2304df62 4405 if (kid && kid->op_sibling) {
11343788
MB		 4406 o->op_type = OP_SSELECT;
4407 o->op_ppaddr = ppaddr[OP_SSELECT];
4408 o = ck_fun(o);
4409 return fold_constants(o);
79072805
LW		 4410 }
4411 }
11343788
MB		 4412 o = ck_fun(o);
4413 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
c07a80fd 4414 if (kid && kid->op_type == OP_RV2GV)
4415 kid->op_private &= ~HINT_STRICT_REFS;
11343788 4416 return o;
79072805
LW		 4417}
4418
4419OP *
8ac85365 4420ck_shift(OP *o)
79072805 4421{
11343788 4422 I32 type = o->op_type;
79072805 4423
11343788 4424 if (!(o->op_flags & OPf_KIDS)) {
6d4ff0d2
MB		 4425 OP *argop;
4426
11343788 4427 op_free(o);
6d4ff0d2 4428#ifdef USE_THREADS
977336f5 4429 if (!CvUNIQUE(compcv)) {
6d4ff0d2
MB		 4430 argop = newOP(OP_PADAV, OPf_REF);
4431 argop->op_targ = 0; /* curpad[0] is @_ */
4432 }
4433 else {
4434 argop = newUNOP(OP_RV2AV, 0,
4435 scalar(newGVOP(OP_GV, 0,
4436 gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
4437 }
4438#else
4439 argop = newUNOP(OP_RV2AV, 0,
977336f5 4440 scalar(newGVOP(OP_GV, 0, !CvUNIQUE(compcv) ?
6d4ff0d2
MB		 4441 defgv : gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
4442#endif /* USE_THREADS */
4443 return newUNOP(type, 0, scalar(argop));
79072805 4444 }
11343788 4445 return scalar(modkids(ck_fun(o), type));
79072805
LW		 4446}
4447
4448OP *
8ac85365 4449ck_sort(OP *o)
79072805 4450{
5dc0d613 4451 o->op_private = 0;
36477c24 4452#ifdef USE_LOCALE
bbce6d69 4453 if (hints & HINT_LOCALE)
5dc0d613 4454 o->op_private |= OPpLOCALE;
bbce6d69 4455#endif
4456
11343788
MB		 4457 if (o->op_flags & OPf_STACKED) {
4458 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
463ee0b2
LW		 4459 OP *k;
4460 kid = kUNOP->op_first; /* get past rv2gv */
79072805 4461
463ee0b2 4462 if (kid->op_type == OP_SCOPE || kid->op_type == OP_LEAVE) {
79072805 4463 linklist(kid);
463ee0b2
LW		 4464 if (kid->op_type == OP_SCOPE) {
4465 k = kid->op_next;
4466 kid->op_next = 0;
79072805 4467 }
463ee0b2 4468 else if (kid->op_type == OP_LEAVE) {
11343788 4469 if (o->op_type == OP_SORT) {
748a9306
LW		 4470 null(kid); /* wipe out leave */
4471 kid->op_next = kid;
463ee0b2 4472
748a9306
LW		 4473 for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
4474 if (k->op_next == kid)
4475 k->op_next = 0;
4476 }
463ee0b2 4477 }
748a9306
LW		 4478 else
4479 kid->op_next = 0; /* just disconnect the leave */
a0d0e21e 4480 k = kLISTOP->op_first;
463ee0b2 4481 }
a0d0e21e
LW		 4482 peep(k);
4483
11343788 4484 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
8990e307 4485 null(kid); /* wipe out rv2gv */
11343788 4486 if (o->op_type == OP_SORT)
a0d0e21e
LW		 4487 kid->op_next = kid;
4488 else
4489 kid->op_next = k;
11343788 4490 o->op_flags |= OPf_SPECIAL;
79072805
LW		 4491 }
4492 }
bbce6d69 4493
11343788 4494 return o;
79072805
LW		 4495}
4496
4497OP *
8ac85365 4498ck_split(OP *o)
79072805
LW		 4499{
4500 register OP *kid;
aeea060c 4501
11343788
MB		 4502 if (o->op_flags & OPf_STACKED)
4503 return no_fh_allowed(o);
79072805 4504
11343788 4505 kid = cLISTOPo->op_first;
8990e307 4506 if (kid->op_type != OP_NULL)
463ee0b2 4507 croak("panic: ck_split");
8990e307 4508 kid = kid->op_sibling;
11343788
MB		 4509 op_free(cLISTOPo->op_first);
4510 cLISTOPo->op_first = kid;
85e6fe83 4511 if (!kid) {
11343788
MB		 4512 cLISTOPo->op_first = kid = newSVOP(OP_CONST, 0, newSVpv(" ", 1));
4513 cLISTOPo->op_last = kid; /* There was only one element previously */
85e6fe83 4514 }
79072805
LW		 4515
4516 if (kid->op_type != OP_MATCH) {
4517 OP *sibl = kid->op_sibling;
463ee0b2 4518 kid->op_sibling = 0;
79072805 4519 kid = pmruntime( newPMOP(OP_MATCH, OPf_SPECIAL), kid, Nullop);
11343788
MB		 4520 if (cLISTOPo->op_first == cLISTOPo->op_last)
4521 cLISTOPo->op_last = kid;
4522 cLISTOPo->op_first = kid;
79072805
LW		 4523 kid->op_sibling = sibl;
4524 }
4525
4526 kid->op_type = OP_PUSHRE;
4527 kid->op_ppaddr = ppaddr[OP_PUSHRE];
4528 scalar(kid);
4529
4530 if (!kid->op_sibling)
54b9620d 4531 append_elem(OP_SPLIT, o, newDEFSVOP());
79072805
LW		 4532
4533 kid = kid->op_sibling;
4534 scalar(kid);
4535
4536 if (!kid->op_sibling)
11343788 4537 append_elem(OP_SPLIT, o, newSVOP(OP_CONST, 0, newSViv(0)));
79072805
LW		 4538
4539 kid = kid->op_sibling;
4540 scalar(kid);
4541
4542 if (kid->op_sibling)
11343788 4543 return too_many_arguments(o,op_desc[o->op_type]);
79072805 4544
11343788 4545 return o;
79072805
LW		 4546}
4547
4548OP *
8ac85365 4549ck_subr(OP *o)
79072805 4550{
11343788
MB		 4551 dTHR;
4552 OP *prev = ((cUNOPo->op_first->op_sibling)
4553 ? cUNOPo : ((UNOP*)cUNOPo->op_first))->op_first;
4554 OP *o2 = prev->op_sibling;
4633a7c4
LW		 4555 OP *cvop;
4556 char *proto = 0;
4557 CV *cv = 0;
46fc3d4c 4558 GV *namegv = 0;
4633a7c4
LW		 4559 int optional = 0;
4560 I32 arg = 0;
4561
11343788 4562 for (cvop = o2; cvop->op_sibling; cvop = cvop->op_sibling) ;
4633a7c4
LW		 4563 if (cvop->op_type == OP_RV2CV) {
4564 SVOP* tmpop;
11343788 4565 o->op_private |= (cvop->op_private & OPpENTERSUB_AMPER);
4633a7c4
LW		 4566 null(cvop); /* disable rv2cv */
4567 tmpop = (SVOP*)((UNOP*)cvop)->op_first;
4568 if (tmpop->op_type == OP_GV) {
8ebc5c01 4569 cv = GvCVu(tmpop->op_sv);
5dc0d613 4570 if (cv && SvPOK(cv) && !(o->op_private & OPpENTERSUB_AMPER)) {
46fc3d4c 4571 namegv = CvANON(cv) ? (GV*)tmpop->op_sv : CvGV(cv);
4572 proto = SvPV((SV*)cv, na);
4573 }
4633a7c4
LW		 4574 }
4575 }
11343788 4576 o->op_private |= (hints & HINT_STRICT_REFS);
84902520 4577 if (PERLDB_SUB && curstash != debstash)
11343788
MB		 4578 o->op_private |= OPpENTERSUB_DB;
4579 while (o2 != cvop) {
4633a7c4
LW		 4580 if (proto) {
4581 switch (*proto) {
4582 case '\0':
5dc0d613 4583 return too_many_arguments(o, gv_ename(namegv));
4633a7c4
LW		 4584 case ';':
4585 optional = 1;
4586 proto++;
4587 continue;
4588 case '$':
4589 proto++;
4590 arg++;
11343788 4591 scalar(o2);
4633a7c4
LW		 4592 break;
4593 case '%':
4594 case '@':
11343788 4595 list(o2);
4633a7c4
LW		 4596 arg++;
4597 break;
4598 case '&':
4599 proto++;
4600 arg++;
11343788 4601 if (o2->op_type != OP_REFGEN && o2->op_type != OP_UNDEF)
5dc0d613 4602 bad_type(arg, "block", gv_ename(namegv), o2);
4633a7c4
LW		 4603 break;
4604 case '*':
4605 proto++;
4606 arg++;
11343788 4607 if (o2->op_type == OP_RV2GV)
4633a7c4
LW		 4608 goto wrapref;
4609 {
11343788 4610 OP* kid = o2;
69dcf70c 4611 OP* sib = kid->op_sibling;
4633a7c4 4612 kid->op_sibling = 0;
69dcf70c
MB		 4613 o2 = newUNOP(OP_RV2GV, 0, kid);
4614 o2->op_sibling = sib;
4633a7c4
LW		 4615 prev->op_sibling = o;
4616 }
4617 goto wrapref;
4618 case '\\':
4619 proto++;
4620 arg++;
4621 switch (*proto++) {
4622 case '*':
11343788 4623 if (o2->op_type != OP_RV2GV)
5dc0d613 4624 bad_type(arg, "symbol", gv_ename(namegv), o2);
4633a7c4
LW		 4625 goto wrapref;
4626 case '&':
11343788 4627 if (o2->op_type != OP_RV2CV)
5dc0d613 4628 bad_type(arg, "sub", gv_ename(namegv), o2);
4633a7c4
LW		 4629 goto wrapref;
4630 case '$':
11343788 4631 if (o2->op_type != OP_RV2SV && o2->op_type != OP_PADSV)
5dc0d613 4632 bad_type(arg, "scalar", gv_ename(namegv), o2);
4633a7c4
LW		 4633 goto wrapref;
4634 case '@':
11343788 4635 if (o2->op_type != OP_RV2AV && o2->op_type != OP_PADAV)
5dc0d613 4636 bad_type(arg, "array", gv_ename(namegv), o2);
4633a7c4
LW		 4637 goto wrapref;
4638 case '%':
11343788 4639 if (o2->op_type != OP_RV2HV && o2->op_type != OP_PADHV)
5dc0d613 4640 bad_type(arg, "hash", gv_ename(namegv), o2);
4633a7c4
LW		 4641 wrapref:
4642 {
11343788
MB		 4643 OP* kid = o2;
4644 o2 = newUNOP(OP_REFGEN, 0, kid);
4645 o2->op_sibling = kid->op_sibling;
4633a7c4 4646 kid->op_sibling = 0;
e858de61 4647 prev->op_sibling = o2;
4633a7c4
LW		 4648 }
4649 break;
4650 default: goto oops;
4651 }
4652 break;
b1cb66bf 4653 case ' ':
4654 proto++;
4655 continue;
4633a7c4
LW		 4656 default:
4657 oops:
4658 croak("Malformed prototype for %s: %s",
46fc3d4c 4659 gv_ename(namegv), SvPV((SV*)cv, na));
4633a7c4
LW		 4660 }
4661 }
4662 else
11343788
MB		 4663 list(o2);
4664 mod(o2, OP_ENTERSUB);
4665 prev = o2;
4666 o2 = o2->op_sibling;
4633a7c4 4667 }
fb73857a 4668 if (proto && !optional &&
4669 (*proto && *proto != '@' && *proto != '%' && *proto != ';'))
5dc0d613 4670 return too_few_arguments(o, gv_ename(namegv));
11343788 4671 return o;
79072805
LW		 4672}
4673
4674OP *
8ac85365 4675ck_svconst(OP *o)
8990e307 4676{
11343788
MB		 4677 SvREADONLY_on(cSVOPo->op_sv);
4678 return o;
8990e307
LW		 4679}
4680
4681OP *
8ac85365 4682ck_trunc(OP *o)
79072805 4683{
11343788
MB		 4684 if (o->op_flags & OPf_KIDS) {
4685 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 4686
a0d0e21e
LW		 4687 if (kid->op_type == OP_NULL)
4688 kid = (SVOP*)kid->op_sibling;
4689 if (kid &&
4690 kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE))
11343788 4691 o->op_flags |= OPf_SPECIAL;
79072805 4692 }
11343788 4693 return ck_fun(o);
79072805
LW		 4694}
4695
463ee0b2
LW		 4696/* A peephole optimizer. We visit the ops in the order they're to execute. */
4697
79072805 4698void
8ac85365 4699peep(register OP *o)
79072805 4700{
11343788 4701 dTHR;
79072805 4702 register OP* oldop = 0;
a0d0e21e 4703 if (!o || o->op_seq)
79072805 4704 return;
a0d0e21e 4705 ENTER;
462e5cf6 4706 SAVEOP();
a0d0e21e
LW		 4707 SAVESPTR(curcop);
4708 for (; o; o = o->op_next) {
4709 if (o->op_seq)
4710 break;
c07a80fd 4711 if (!op_seqmax)
4712 op_seqmax++;
a0d0e21e
LW		 4713 op = o;
4714 switch (o->op_type) {
4715 case OP_NEXTSTATE:
4716 case OP_DBSTATE:
4717 curcop = ((COP*)o); /* for warnings */
c07a80fd 4718 o->op_seq = op_seqmax++;
a0d0e21e
LW		 4719 break;
4720
4721 case OP_CONCAT:
4722 case OP_CONST:
4723 case OP_JOIN:
4724 case OP_UC:
4725 case OP_UCFIRST:
4726 case OP_LC:
4727 case OP_LCFIRST:
4728 case OP_QUOTEMETA:
3c4f770c 4729 if (o->op_next && o->op_next->op_type == OP_STRINGIFY)
a0d0e21e 4730 null(o->op_next);
c07a80fd 4731 o->op_seq = op_seqmax++;
a0d0e21e 4732 break;
8990e307 4733 case OP_STUB:
54310121 4734 if ((o->op_flags & OPf_WANT) != OPf_WANT_LIST) {
c07a80fd 4735 o->op_seq = op_seqmax++;
54310121 4736 break; /* Scalar stub must produce undef. List stub is noop */
8990e307 4737 }
748a9306 4738 goto nothin;
79072805 4739 case OP_NULL:
748a9306
LW		 4740 if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
4741 curcop = ((COP*)op);
4742 goto nothin;
79072805 4743 case OP_SCALAR:
93a17b20 4744 case OP_LINESEQ:
463ee0b2 4745 case OP_SCOPE:
748a9306 4746 nothin:
a0d0e21e
LW		 4747 if (oldop && o->op_next) {
4748 oldop->op_next = o->op_next;
79072805
LW		 4749 continue;
4750 }
c07a80fd 4751 o->op_seq = op_seqmax++;
79072805
LW		 4752 break;
4753
4754 case OP_GV:
a0d0e21e 4755 if (o->op_next->op_type == OP_RV2SV) {
5f05dabc 4756 if (!(o->op_next->op_private & OPpDEREF)) {
a0d0e21e
LW		 4757 null(o->op_next);
4758 o->op_private |= o->op_next->op_private & OPpLVAL_INTRO;
4759 o->op_next = o->op_next->op_next;
4760 o->op_type = OP_GVSV;
4761 o->op_ppaddr = ppaddr[OP_GVSV];
8990e307
LW		 4762 }
4763 }
a0d0e21e
LW		 4764 else if (o->op_next->op_type == OP_RV2AV) {
4765 OP* pop = o->op_next->op_next;
4766 IV i;
8990e307 4767 if (pop->op_type == OP_CONST &&
e858de61 4768 (op = pop->op_next) &&
8990e307 4769 pop->op_next->op_type == OP_AELEM &&
a0d0e21e 4770 !(pop->op_next->op_private &
68dc0745 4771 (OPpLVAL_INTRO|OPpLVAL_DEFER|OPpDEREF)) &&
a0d0e21e
LW		 4772 (i = SvIV(((SVOP*)pop)->op_sv) - compiling.cop_arybase)
4773 <= 255 &&
8990e307
LW		 4774 i >= 0)
4775 {
748a9306 4776 SvREFCNT_dec(((SVOP*)pop)->op_sv);
a0d0e21e 4777 null(o->op_next);
8990e307
LW		 4778 null(pop->op_next);
4779 null(pop);
a0d0e21e
LW		 4780 o->op_flags |= pop->op_next->op_flags & OPf_MOD;
4781 o->op_next = pop->op_next->op_next;
4782 o->op_type = OP_AELEMFAST;
4783 o->op_ppaddr = ppaddr[OP_AELEMFAST];
4784 o->op_private = (U8)i;
a6006777 4785 GvAVn(((GVOP*)o)->op_gv);
8990e307 4786 }
79072805 4787 }
c07a80fd 4788 o->op_seq = op_seqmax++;
79072805
LW		 4789 break;
4790
af41f3ca
MB		 4791 case OP_PADAV:
4792 if (o->op_next->op_type == OP_RV2AV
4793 && (o->op_next->op_flags && OPf_REF))
4794 {
4795 null(o->op_next);
4796 o->op_next = o->op_next->op_next;
4797 }
4798 break;
aeea060c 4799
af41f3ca
MB		 4800 case OP_PADHV:
4801 if (o->op_next->op_type == OP_RV2HV
4802 && (o->op_next->op_flags && OPf_REF))
4803 {
4804 null(o->op_next);
4805 o->op_next = o->op_next->op_next;
4806 }
4807 break;
4808
a0d0e21e 4809 case OP_MAPWHILE:
79072805
LW		 4810 case OP_GREPWHILE:
4811 case OP_AND:
4812 case OP_OR:
c07a80fd 4813 o->op_seq = op_seqmax++;
79072805
LW		 4814 peep(cLOGOP->op_other);
4815 break;
4816
4817 case OP_COND_EXPR:
c07a80fd 4818 o->op_seq = op_seqmax++;
79072805
LW		 4819 peep(cCONDOP->op_true);
4820 peep(cCONDOP->op_false);
4821 break;
4822
4823 case OP_ENTERLOOP:
c07a80fd 4824 o->op_seq = op_seqmax++;
79072805
LW		 4825 peep(cLOOP->op_redoop);
4826 peep(cLOOP->op_nextop);
4827 peep(cLOOP->op_lastop);
4828 break;
4829
4830 case OP_MATCH:
4831 case OP_SUBST:
c07a80fd 4832 o->op_seq = op_seqmax++;
a0d0e21e 4833 peep(cPMOP->op_pmreplstart);
79072805
LW		 4834 break;
4835
a0d0e21e 4836 case OP_EXEC:
c07a80fd 4837 o->op_seq = op_seqmax++;
a0d0e21e
LW		 4838 if (dowarn && o->op_next && o->op_next->op_type == OP_NEXTSTATE) {
4839 if (o->op_next->op_sibling &&
4840 o->op_next->op_sibling->op_type != OP_DIE) {
4841 line_t oldline = curcop->cop_line;
4842
4843 curcop->cop_line = ((COP*)o->op_next)->cop_line;
4844 warn("Statement unlikely to be reached");
4845 warn("(Maybe you meant system() when you said exec()?)\n");
4846 curcop->cop_line = oldline;
4847 }
4848 }
4849 break;
aeea060c 4850
c750a3ec
MB		 4851 case OP_HELEM: {
4852 UNOP *rop;
4853 SV *lexname;
4854 GV **fields;
4855 SV **svp, **indsvp;
4856 I32 ind;
4857 char *key;
4858 STRLEN keylen;
aeea060c 4859
c750a3ec
MB		 4860 if (o->op_private & (OPpDEREF_HV|OPpDEREF_AV|OPpLVAL_INTRO)
4861 || ((BINOP*)o)->op_last->op_type != OP_CONST)
4862 break;
4863 rop = (UNOP*)((BINOP*)o)->op_first;
4864 if (rop->op_type != OP_RV2HV || rop->op_first->op_type != OP_PADSV)
4865 break;
4866 lexname = *av_fetch(comppad_name, rop->op_first->op_targ, TRUE);
4867 if (!SvOBJECT(lexname))
4868 break;
5196be3e 4869 fields = (GV**)hv_fetch(SvSTASH(lexname), "FIELDS", 6, FALSE);
c750a3ec
MB		 4870 if (!fields || !GvHV(*fields))
4871 break;
4872 svp = &((SVOP*)((BINOP*)o)->op_last)->op_sv;
4873 key = SvPV(*svp, keylen);
4874 indsvp = hv_fetch(GvHV(*fields), key, keylen, FALSE);
4875 if (!indsvp) {
4876 croak("No such field \"%s\" in variable %s of type %s",
4877 key, SvPV(lexname, na), HvNAME(SvSTASH(lexname)));
4878 }
4879 ind = SvIV(*indsvp);
4880 if (ind < 1)
4881 croak("Bad index while coercing array into hash");
4882 rop->op_type = OP_RV2AV;
4883 rop->op_ppaddr = ppaddr[OP_RV2AV];
4884 o->op_type = OP_AELEM;
4885 o->op_ppaddr = ppaddr[OP_AELEM];
4886 SvREFCNT_dec(*svp);
4887 *svp = newSViv(ind);
4888 break;
4889 }
4890
79072805 4891 default:
c07a80fd 4892 o->op_seq = op_seqmax++;
79072805
LW		 4893 break;
4894 }
a0d0e21e 4895 oldop = o;
79072805 4896 }
a0d0e21e 4897 LEAVE;
79072805 4898}
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