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small tweaks from Jarkko Hietaniemi <jhi@cc.hut.fi>
[perl5.git] / op.c
CommitLineData
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
76e3520e
GS		 21#ifdef PERL_OBJECT
22#define CHECKCALL this->*check
23#else
24#define CHECKCALL *check
25#endif
26
e50aee73 27/*
5dc0d613 28 * In the following definition, the ", Nullop" is just to make the compiler
a5f75d66 29 * think the expression is of the right type: croak actually does a Siglongjmp.
e50aee73 30 */
11343788 31#define CHECKOP(type,o) \
28757baa 32 ((op_mask && op_mask[type]) \
5dc0d613 33 ? ( op_free((OP*)o), \
28757baa 34 croak("%s trapped by operation mask", op_desc[type]), \
35 Nullop ) \
76e3520e 36 : (CHECKCALL[type])((OP*)o))
e50aee73 37
76e3520e
GS		 38static bool scalar_mod_type _((OP *o, I32 type));
39#ifndef PERL_OBJECT
11343788 40static I32 list_assignment _((OP *o));
3bc5dc61 41static void bad_type _((I32 n, char *t, char *name, OP *kid));
11343788
MB		 42static OP *modkids _((OP *o, I32 type));
43static OP *no_fh_allowed _((OP *o));
44static OP *scalarboolean _((OP *o));
45static OP *too_few_arguments _((OP *o, char* name));
46static OP *too_many_arguments _((OP *o, char* name));
47static void null _((OP* o));
bbce6d69 48static PADOFFSET pad_findlex _((char* name, PADOFFSET newoff, U32 seq,
748a9306 49 CV* startcv, I32 cx_ix));
54b9620d 50static OP *newDEFSVOP _((void));
883ffac3 51static OP *new_logop _((I32 type, I32 flags, OP **firstp, OP **otherp));
76e3520e 52#endif
79072805 53
76e3520e 54STATIC char*
8ac85365 55gv_ename(GV *gv)
4633a7c4
LW		 56{
57 SV* tmpsv = sv_newmortal();
46fc3d4c 58 gv_efullname3(tmpsv, gv, Nullch);
4633a7c4
LW		 59 return SvPV(tmpsv,na);
60}
61
76e3520e 62STATIC OP *
8ac85365 63no_fh_allowed(OP *o)
79072805 64{
46fc3d4c 65 yyerror(form("Missing comma after first argument to %s function",
5196be3e 66 op_desc[o->op_type]));
11343788 67 return o;
79072805
LW		 68}
69
76e3520e 70STATIC OP *
8ac85365 71too_few_arguments(OP *o, char *name)
79072805 72{
46fc3d4c 73 yyerror(form("Not enough arguments for %s", name));
11343788 74 return o;
79072805
LW		 75}
76
76e3520e 77STATIC OP *
8ac85365 78too_many_arguments(OP *o, char *name)
79072805 79{
46fc3d4c 80 yyerror(form("Too many arguments for %s", name));
11343788 81 return o;
79072805
LW		 82}
83
76e3520e 84STATIC void
8ac85365 85bad_type(I32 n, char *t, char *name, OP *kid)
8990e307 86{
46fc3d4c 87 yyerror(form("Type of arg %d to %s must be %s (not %s)",
88 (int)n, name, t, op_desc[kid->op_type]));
8990e307
LW		 89}
90
a0d0e21e 91void
8ac85365 92assertref(OP *o)
a0d0e21e 93{
11343788 94 int type = o->op_type;
a0d0e21e 95 if (type != OP_AELEM && type != OP_HELEM) {
46fc3d4c 96 yyerror(form("Can't use subscript on %s", op_desc[type]));
bde90e66 97 if (type == OP_ENTERSUB || type == OP_RV2HV || type == OP_PADHV) {
9c82454c 98 dTHR;
bde90e66
HS		 99 SV *msg = sv_2mortal(
100 newSVpvf("(Did you mean $ or @ instead of %c?)\n",
101 type == OP_ENTERSUB ? '&' : '%'));
102 if (in_eval & 2)
103 warn("%_", msg);
104 else if (in_eval)
105 sv_catsv(GvSV(errgv), msg);
106 else
107 PerlIO_write(PerlIO_stderr(), SvPVX(msg), SvCUR(msg));
108 }
a0d0e21e
LW		 109 }
110}
111
79072805
LW		 112/* "register" allocation */
113
114PADOFFSET
8ac85365 115pad_allocmy(char *name)
93a17b20 116{
11343788 117 dTHR;
a0d0e21e
LW		 118 PADOFFSET off;
119 SV *sv;
120
121 if (!(isALPHA(name[1]) || name[1] == '_' && (int)strlen(name) > 2)) {
46fc3d4c 122 if (!isPRINT(name[1])) {
123 name[3] = '\0';
124 name[2] = toCTRL(name[1]);
125 name[1] = '^';
126 }
a0d0e21e
LW		 127 croak("Can't use global %s in \"my\"",name);
128 }
93965878 129 if (dowarn && AvFILLp(comppad_name) >= 0) {
b1cb66bf 130 SV **svp = AvARRAY(comppad_name);
93965878 131 for (off = AvFILLp(comppad_name); off > comppad_name_floor; off--) {
b1cb66bf 132 if ((sv = svp[off])
133 && sv != &sv_undef
134 && SvIVX(sv) == 999999999 /* var is in open scope */
135 && strEQ(name, SvPVX(sv)))
136 {
137 warn("\"my\" variable %s masks earlier declaration in same scope", name);
138 break;
139 }
140 }
141 }
a0d0e21e
LW		 142 off = pad_alloc(OP_PADSV, SVs_PADMY);
143 sv = NEWSV(1102,0);
93a17b20
LW		 144 sv_upgrade(sv, SVt_PVNV);
145 sv_setpv(sv, name);
c750a3ec
MB		 146 if (in_my_stash) {
147 if (*name != '$')
148 croak("Can't declare class for non-scalar %s in \"my\"",name);
149 SvOBJECT_on(sv);
150 (void)SvUPGRADE(sv, SVt_PVMG);
151 SvSTASH(sv) = (HV*)SvREFCNT_inc(in_my_stash);
152 sv_objcount++;
153 }
8990e307 154 av_store(comppad_name, off, sv);
748a9306 155 SvNVX(sv) = (double)999999999;
8990e307
LW		 156 SvIVX(sv) = 0; /* Not yet introduced--see newSTATEOP */
157 if (!min_intro_pending)
158 min_intro_pending = off;
159 max_intro_pending = off;
93a17b20 160 if (*name == '@')
463ee0b2 161 av_store(comppad, off, (SV*)newAV());
93a17b20 162 else if (*name == '%')
463ee0b2 163 av_store(comppad, off, (SV*)newHV());
ed6116ce 164 SvPADMY_on(curpad[off]);
93a17b20
LW		 165 return off;
166}
167
76e3520e 168STATIC PADOFFSET
bbce6d69 169pad_findlex(char *name, PADOFFSET newoff, U32 seq, CV* startcv, I32 cx_ix)
93a17b20 170{
11343788 171 dTHR;
748a9306 172 CV *cv;
93a17b20
LW		 173 I32 off;
174 SV *sv;
93a17b20 175 register I32 i;
c09156bb 176 register PERL_CONTEXT *cx;
a0d0e21e 177 int saweval;
93a17b20 178
748a9306 179 for (cv = startcv; cv; cv = CvOUTSIDE(cv)) {
4fdae800 180 AV *curlist = CvPADLIST(cv);
181 SV **svp = av_fetch(curlist, 0, FALSE);
748a9306 182 AV *curname;
4fdae800 183
748a9306 184 if (!svp || *svp == &sv_undef)
4633a7c4 185 continue;
748a9306
LW		 186 curname = (AV*)*svp;
187 svp = AvARRAY(curname);
93965878 188 for (off = AvFILLp(curname); off > 0; off--) {
748a9306
LW		 189 if ((sv = svp[off]) &&
190 sv != &sv_undef &&
191 seq <= SvIVX(sv) &&
13826f2c 192 seq > I_32(SvNVX(sv)) &&
748a9306
LW		 193 strEQ(SvPVX(sv), name))
194 {
5f05dabc 195 I32 depth;
196 AV *oldpad;
197 SV *oldsv;
198
199 depth = CvDEPTH(cv);
200 if (!depth) {
9607fc9c 201 if (newoff) {
202 if (SvFAKE(sv))
203 continue;
4fdae800 204 return 0; /* don't clone from inactive stack frame */
9607fc9c 205 }
5f05dabc 206 depth = 1;
207 }
208 oldpad = (AV*)*av_fetch(curlist, depth, FALSE);
209 oldsv = *av_fetch(oldpad, off, TRUE);
748a9306 210 if (!newoff) { /* Not a mere clone operation. */
9607fc9c 211 SV *namesv = NEWSV(1103,0);
748a9306 212 newoff = pad_alloc(OP_PADSV, SVs_PADMY);
9607fc9c 213 sv_upgrade(namesv, SVt_PVNV);
214 sv_setpv(namesv, name);
215 av_store(comppad_name, newoff, namesv);
216 SvNVX(namesv) = (double)curcop->cop_seq;
217 SvIVX(namesv) = 999999999; /* A ref, intro immediately */
218 SvFAKE_on(namesv); /* A ref, not a real var */
774d564b 219 if (CvANON(compcv) || SvTYPE(compcv) == SVt_PVFM) {
28757baa 220 /* "It's closures all the way down." */
221 CvCLONE_on(compcv);
54310121 222 if (cv == startcv) {
223 if (CvANON(compcv))
224 oldsv = Nullsv; /* no need to keep ref */
225 }
226 else {
28757baa 227 CV *bcv;
228 for (bcv = startcv;
229 bcv && bcv != cv && !CvCLONE(bcv);
230 bcv = CvOUTSIDE(bcv)) {
231 if (CvANON(bcv))
232 CvCLONE_on(bcv);
233 else {
774d564b 234 if (dowarn && !CvUNIQUE(cv))
44a8e56a 235 warn(
236 "Variable \"%s\" may be unavailable",
28757baa 237 name);
238 break;
239 }
240 }
241 }
242 }
44a8e56a 243 else if (!CvUNIQUE(compcv)) {
9607fc9c 244 if (dowarn && !SvFAKE(sv) && !CvUNIQUE(cv))
44a8e56a 245 warn("Variable \"%s\" will not stay shared", name);
5f05dabc 246 }
748a9306 247 }
199100c8 248 av_store(comppad, newoff, SvREFCNT_inc(oldsv));
748a9306
LW		 249 return newoff;
250 }
93a17b20
LW		 251 }
252 }
253
254 /* Nothing in current lexical context--try eval's context, if any.
255 * This is necessary to let the perldb get at lexically scoped variables.
256 * XXX This will also probably interact badly with eval tree caching.
257 */
258
a0d0e21e 259 saweval = 0;
748a9306 260 for (i = cx_ix; i >= 0; i--) {
93a17b20
LW		 261 cx = &cxstack[i];
262 switch (cx->cx_type) {
263 default:
748a9306
LW		 264 if (i == 0 && saweval) {
265 seq = cxstack[saweval].blk_oldcop->cop_seq;
266 return pad_findlex(name, newoff, seq, main_cv, 0);
267 }
93a17b20
LW		 268 break;
269 case CXt_EVAL:
44a8e56a 270 switch (cx->blk_eval.old_op_type) {
271 case OP_ENTEREVAL:
272 saweval = i;
273 break;
274 case OP_REQUIRE:
275 /* require must have its own scope */
276 return 0;
277 }
93a17b20
LW		 278 break;
279 case CXt_SUB:
280 if (!saweval)
281 return 0;
282 cv = cx->blk_sub.cv;
748a9306
LW		 283 if (debstash && CvSTASH(cv) == debstash) { /* ignore DB'* scope */
284 saweval = i; /* so we know where we were called from */
93a17b20 285 continue;
93a17b20 286 }
748a9306
LW		 287 seq = cxstack[saweval].blk_oldcop->cop_seq;
288 return pad_findlex(name, newoff, seq, cv, i-1);
93a17b20
LW		 289 }
290 }
291
748a9306
LW		 292 return 0;
293}
a0d0e21e 294
748a9306 295PADOFFSET
8ac85365 296pad_findmy(char *name)
748a9306 297{
11343788 298 dTHR;
748a9306 299 I32 off;
54310121 300 I32 pendoff = 0;
748a9306
LW		 301 SV *sv;
302 SV **svp = AvARRAY(comppad_name);
bbce6d69 303 U32 seq = cop_seqmax;
748a9306 304
11343788
MB		 305#ifdef USE_THREADS
306 /*
307 * Special case to get lexical (and hence per-thread) @_.
308 * XXX I need to find out how to tell at parse-time whether use
309 * of @_ should refer to a lexical (from a sub) or defgv (global
310 * scope and maybe weird sub-ish things like formats). See
311 * startsub in perly.y. It's possible that @_ could be lexical
312 * (at least from subs) even in non-threaded perl.
313 */
314 if (strEQ(name, "@_"))
315 return 0; /* success. (NOT_IN_PAD indicates failure) */
316#endif /* USE_THREADS */
317
748a9306 318 /* The one we're looking for is probably just before comppad_name_fill. */
93965878 319 for (off = AvFILLp(comppad_name); off > 0; off--) {
a0d0e21e
LW		 320 if ((sv = svp[off]) &&
321 sv != &sv_undef &&
54310121 322 (!SvIVX(sv) ||
323 (seq <= SvIVX(sv) &&
324 seq > I_32(SvNVX(sv)))) &&
a0d0e21e
LW		 325 strEQ(SvPVX(sv), name))
326 {
54310121 327 if (SvIVX(sv))
328 return (PADOFFSET)off;
329 pendoff = off; /* this pending def. will override import */
a0d0e21e
LW		 330 }
331 }
748a9306
LW		 332
333 /* See if it's in a nested scope */
334 off = pad_findlex(name, 0, seq, CvOUTSIDE(compcv), cxstack_ix);
54310121 335 if (off) {
336 /* If there is a pending local definition, this new alias must die */
337 if (pendoff)
338 SvIVX(AvARRAY(comppad_name)[off]) = seq;
11343788 339 return off; /* pad_findlex returns 0 for failure...*/
54310121 340 }
11343788 341 return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */
93a17b20
LW		 342}
343
344void
8ac85365 345pad_leavemy(I32 fill)
93a17b20
LW		 346{
347 I32 off;
8990e307 348 SV **svp = AvARRAY(comppad_name);
93a17b20 349 SV *sv;
8990e307
LW		 350 if (min_intro_pending && fill < min_intro_pending) {
351 for (off = max_intro_pending; off >= min_intro_pending; off--) {
a0d0e21e 352 if ((sv = svp[off]) && sv != &sv_undef)
8990e307
LW		 353 warn("%s never introduced", SvPVX(sv));
354 }
355 }
356 /* "Deintroduce" my variables that are leaving with this scope. */
93965878 357 for (off = AvFILLp(comppad_name); off > fill; off--) {
748a9306 358 if ((sv = svp[off]) && sv != &sv_undef && SvIVX(sv) == 999999999)
463ee0b2 359 SvIVX(sv) = cop_seqmax;
93a17b20
LW		 360 }
361}
362
363PADOFFSET
8ac85365 364pad_alloc(I32 optype, U32 tmptype)
79072805 365{
11343788 366 dTHR;
79072805
LW		 367 SV *sv;
368 I32 retval;
369
370 if (AvARRAY(comppad) != curpad)
463ee0b2 371 croak("panic: pad_alloc");
a0d0e21e
LW		 372 if (pad_reset_pending)
373 pad_reset();
ed6116ce 374 if (tmptype & SVs_PADMY) {
79072805 375 do {
93965878 376 sv = *av_fetch(comppad, AvFILLp(comppad) + 1, TRUE);
ed6116ce 377 } while (SvPADBUSY(sv)); /* need a fresh one */
93965878 378 retval = AvFILLp(comppad);
79072805
LW		 379 }
380 else {
bbce6d69 381 SV **names = AvARRAY(comppad_name);
93965878 382 SSize_t names_fill = AvFILLp(comppad_name);
bbce6d69 383 for (;;) {
384 /*
385 * "foreach" index vars temporarily become aliases to non-"my"
386 * values. Thus we must skip, not just pad values that are
387 * marked as current pad values, but also those with names.
388 */
389 if (++padix <= names_fill &&
390 (sv = names[padix]) && sv != &sv_undef)
391 continue;
392 sv = *av_fetch(comppad, padix, TRUE);
393 if (!(SvFLAGS(sv) & (SVs_PADTMP|SVs_PADMY)))
394 break;
395 }
79072805
LW		 396 retval = padix;
397 }
8990e307 398 SvFLAGS(sv) |= tmptype;
79072805 399 curpad = AvARRAY(comppad);
11343788 400#ifdef USE_THREADS
5dc0d613
MB		 401 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx alloc %ld for %s\n",
402 (unsigned long) thr, (unsigned long) curpad,
403 (long) retval, op_name[optype]));
11343788 404#else
d9bb4600
GS		 405 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx alloc %ld for %s\n",
406 (unsigned long) curpad,
5dc0d613 407 (long) retval, op_name[optype]));
11343788 408#endif /* USE_THREADS */
79072805
LW		 409 return (PADOFFSET)retval;
410}
411
412SV *
8990e307 413pad_sv(PADOFFSET po)
79072805 414{
11343788
MB		 415 dTHR;
416#ifdef USE_THREADS
5dc0d613
MB		 417 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx sv %d\n",
418 (unsigned long) thr, (unsigned long) curpad, po));
11343788 419#else
79072805 420 if (!po)
463ee0b2 421 croak("panic: pad_sv po");
d9bb4600
GS		 422 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx sv %d\n",
423 (unsigned long) curpad, po));
11343788 424#endif /* USE_THREADS */
79072805
LW		 425 return curpad[po]; /* eventually we'll turn this into a macro */
426}
427
428void
8990e307 429pad_free(PADOFFSET po)
79072805 430{
11343788 431 dTHR;
a0d0e21e
LW		 432 if (!curpad)
433 return;
79072805 434 if (AvARRAY(comppad) != curpad)
463ee0b2 435 croak("panic: pad_free curpad");
79072805 436 if (!po)
463ee0b2 437 croak("panic: pad_free po");
11343788 438#ifdef USE_THREADS
5dc0d613
MB		 439 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx free %d\n",
440 (unsigned long) thr, (unsigned long) curpad, po));
11343788 441#else
d9bb4600
GS		 442 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx free %d\n",
443 (unsigned long) curpad, po));
11343788 444#endif /* USE_THREADS */
a0d0e21e 445 if (curpad[po] && curpad[po] != &sv_undef)
ed6116ce 446 SvPADTMP_off(curpad[po]);
a0d0e21e 447 if ((I32)po < padix)
79072805
LW		 448 padix = po - 1;
449}
450
451void
8990e307 452pad_swipe(PADOFFSET po)
79072805 453{
11343788 454 dTHR;
79072805 455 if (AvARRAY(comppad) != curpad)
463ee0b2 456 croak("panic: pad_swipe curpad");
79072805 457 if (!po)
463ee0b2 458 croak("panic: pad_swipe po");
11343788 459#ifdef USE_THREADS
5dc0d613
MB		 460 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx swipe %d\n",
461 (unsigned long) thr, (unsigned long) curpad, po));
11343788 462#else
d9bb4600
GS		 463 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx swipe %d\n",
464 (unsigned long) curpad, po));
11343788 465#endif /* USE_THREADS */
ed6116ce 466 SvPADTMP_off(curpad[po]);
a0d0e21e
LW		 467 curpad[po] = NEWSV(1107,0);
468 SvPADTMP_on(curpad[po]);
469 if ((I32)po < padix)
79072805
LW		 470 padix = po - 1;
471}
472
d9bb4600
GS		 473/* XXX pad_reset() is currently disabled because it results in serious bugs.
474 * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed
475 * on the stack by OPs that use them, there are several ways to get an alias
476 * to a shared TARG. Such an alias will change randomly and unpredictably.
477 * We avoid doing this until we can think of a Better Way.
478 * GSAR 97-10-29 */
79072805 479void
8ac85365 480pad_reset(void)
79072805 481{
d9bb4600 482#ifdef USE_BROKEN_PAD_RESET
11343788 483 dTHR;
79072805
LW		 484 register I32 po;
485
486 if (AvARRAY(comppad) != curpad)
463ee0b2 487 croak("panic: pad_reset curpad");
11343788 488#ifdef USE_THREADS
5dc0d613
MB		 489 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx reset\n",
490 (unsigned long) thr, (unsigned long) curpad));
11343788 491#else
d9bb4600
GS		 492 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx reset\n",
493 (unsigned long) curpad));
11343788 494#endif /* USE_THREADS */
748a9306
LW		 495 if (!tainting) { /* Can't mix tainted and non-tainted temporaries. */
496 for (po = AvMAX(comppad); po > padix_floor; po--) {
ff0cee69 497 if (curpad[po] && !SvIMMORTAL(curpad[po]))
748a9306
LW		 498 SvPADTMP_off(curpad[po]);
499 }
500 padix = padix_floor;
79072805 501 }
d9bb4600 502#endif
a0d0e21e 503 pad_reset_pending = FALSE;
79072805
LW		 504}
505
a863c7d1 506#ifdef USE_THREADS
54b9620d 507/* find_threadsv is not reentrant */
a863c7d1 508PADOFFSET
54b9620d 509find_threadsv(char *name)
a863c7d1
MB		 510{
511 dTHR;
512 char *p;
513 PADOFFSET key;
554b3eca 514 SV **svp;
54b9620d
MB		 515 /* We currently only handle names of a single character */
516 p = strchr(threadsv_names, *name);
a863c7d1
MB		 517 if (!p)
518 return NOT_IN_PAD;
54b9620d
MB		 519 key = p - threadsv_names;
520 svp = av_fetch(thr->threadsv, key, FALSE);
554b3eca
MB		 521 if (!svp) {
522 SV *sv = NEWSV(0, 0);
54b9620d 523 av_store(thr->threadsv, key, sv);
940cb80d 524 thr->threadsvp = AvARRAY(thr->threadsv);
554b3eca
MB		 525 /*
526 * Some magic variables used to be automagically initialised
527 * in gv_fetchpv. Those which are now per-thread magicals get
528 * initialised here instead.
529 */
530 switch (*name) {
54b9620d
MB		 531 case '_':
532 break;
554b3eca
MB		 533 case ';':
534 sv_setpv(sv, "\034");
54b9620d 535 sv_magic(sv, 0, 0, name, 1);
554b3eca 536 break;
c277df42
IZ		 537 case '&':
538 case '`':
539 case '\'':
540 sawampersand = TRUE;
541 SvREADONLY_on(sv);
d8b5173a 542 /* FALL THROUGH */
067391ea
GS		 543
544 /* XXX %! tied to Errno.pm needs to be added here.
545 * See gv_fetchpv(). */
546 /* case '!': */
547
54b9620d
MB		 548 default:
549 sv_magic(sv, 0, 0, name, 1);
554b3eca 550 }
a863c7d1 551 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
54b9620d 552 "find_threadsv: new SV %p for $%s%c\n",
554b3eca
MB		 553 sv, (*name < 32) ? "^" : "",
554 (*name < 32) ? toCTRL(*name) : *name));
a863c7d1
MB		 555 }
556 return key;
557}
558#endif /* USE_THREADS */
559
79072805
LW		 560/* Destructor */
561
562void
8ac85365 563op_free(OP *o)
79072805 564{
85e6fe83 565 register OP *kid, *nextkid;
79072805 566
5dc0d613 567 if (!o || o->op_seq == (U16)-1)
79072805
LW		 568 return;
569
11343788
MB		 570 if (o->op_flags & OPf_KIDS) {
571 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 572 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 573 op_free(kid);
85e6fe83 574 }
79072805
LW		 575 }
576
11343788 577 switch (o->op_type) {
8990e307 578 case OP_NULL:
11343788 579 o->op_targ = 0; /* Was holding old type, if any. */
8990e307 580 break;
a0d0e21e 581 case OP_ENTEREVAL:
11343788 582 o->op_targ = 0; /* Was holding hints. */
a0d0e21e 583 break;
554b3eca 584#ifdef USE_THREADS
2faa37cc 585 case OP_THREADSV:
54b9620d 586 o->op_targ = 0; /* Was holding index into thr->threadsv AV. */
554b3eca
MB		 587 break;
588#endif /* USE_THREADS */
a6006777 589 default:
ac4c12e7
GS		 590 if (!(o->op_flags & OPf_REF)
591 || (check[o->op_type] != FUNC_NAME_TO_PTR(ck_ftst)))
a6006777 592 break;
593 /* FALL THROUGH */
463ee0b2 594 case OP_GVSV:
79072805 595 case OP_GV:
a6006777 596 case OP_AELEMFAST:
11343788 597 SvREFCNT_dec(cGVOPo->op_gv);
8990e307
LW		 598 break;
599 case OP_NEXTSTATE:
600 case OP_DBSTATE:
5196be3e 601 Safefree(cCOPo->cop_label);
11343788 602 SvREFCNT_dec(cCOPo->cop_filegv);
79072805
LW		 603 break;
604 case OP_CONST:
11343788 605 SvREFCNT_dec(cSVOPo->op_sv);
79072805 606 break;
748a9306
LW		 607 case OP_GOTO:
608 case OP_NEXT:
609 case OP_LAST:
610 case OP_REDO:
11343788 611 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 612 break;
613 /* FALL THROUGH */
a0d0e21e 614 case OP_TRANS:
11343788 615 Safefree(cPVOPo->op_pv);
a0d0e21e
LW		 616 break;
617 case OP_SUBST:
11343788 618 op_free(cPMOPo->op_pmreplroot);
a0d0e21e 619 /* FALL THROUGH */
748a9306 620 case OP_PUSHRE:
a0d0e21e 621 case OP_MATCH:
c277df42 622 ReREFCNT_dec(cPMOPo->op_pmregexp);
a0d0e21e 623 break;
79072805
LW		 624 }
625
11343788
MB		 626 if (o->op_targ > 0)
627 pad_free(o->op_targ);
8990e307 628
11343788 629 Safefree(o);
79072805
LW		 630}
631
76e3520e 632STATIC void
8ac85365 633null(OP *o)
8990e307 634{
54b9620d 635 if (o->op_type != OP_NULL && o->op_type != OP_THREADSV && o->op_targ > 0)
11343788
MB		 636 pad_free(o->op_targ);
637 o->op_targ = o->op_type;
638 o->op_type = OP_NULL;
639 o->op_ppaddr = ppaddr[OP_NULL];
8990e307
LW		 640}
641
79072805
LW		 642/* Contextualizers */
643
463ee0b2 644#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 645
646OP *
8ac85365 647linklist(OP *o)
79072805
LW		 648{
649 register OP *kid;
650
11343788
MB		 651 if (o->op_next)
652 return o->op_next;
79072805
LW		 653
654 /* establish postfix order */
11343788
MB		 655 if (cUNOPo->op_first) {
656 o->op_next = LINKLIST(cUNOPo->op_first);
657 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 658 if (kid->op_sibling)
659 kid->op_next = LINKLIST(kid->op_sibling);
660 else
11343788 661 kid->op_next = o;
79072805
LW		 662 }
663 }
664 else
11343788 665 o->op_next = o;
79072805 666
11343788 667 return o->op_next;
79072805
LW		 668}
669
670OP *
8ac85365 671scalarkids(OP *o)
79072805
LW		 672{
673 OP *kid;
11343788
MB		 674 if (o && o->op_flags & OPf_KIDS) {
675 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 676 scalar(kid);
677 }
11343788 678 return o;
79072805
LW		 679}
680
76e3520e 681STATIC OP *
8ac85365 682scalarboolean(OP *o)
8990e307
LW		 683{
684 if (dowarn &&
11343788 685 o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
0f15f207 686 dTHR;
a0d0e21e
LW		 687 line_t oldline = curcop->cop_line;
688
689 if (copline != NOLINE)
690 curcop->cop_line = copline;
691 warn("Found = in conditional, should be ==");
692 curcop->cop_line = oldline;
693 }
11343788 694 return scalar(o);
8990e307
LW		 695}
696
697OP *
8ac85365 698scalar(OP *o)
79072805
LW		 699{
700 OP *kid;
701
a0d0e21e 702 /* assumes no premature commitment */
5dc0d613
MB		 703 if (!o || (o->op_flags & OPf_WANT) || error_count
704 || o->op_type == OP_RETURN)
11343788 705 return o;
79072805 706
5dc0d613 707 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 708
11343788 709 switch (o->op_type) {
79072805 710 case OP_REPEAT:
11343788
MB		 711 if (o->op_private & OPpREPEAT_DOLIST)
712 null(((LISTOP*)cBINOPo->op_first)->op_first);
713 scalar(cBINOPo->op_first);
8990e307 714 break;
79072805
LW		 715 case OP_OR:
716 case OP_AND:
717 case OP_COND_EXPR:
11343788 718 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 719 scalar(kid);
79072805 720 break;
a0d0e21e 721 case OP_SPLIT:
11343788 722 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 723 if (!kPMOP->op_pmreplroot)
724 deprecate("implicit split to @_");
725 }
726 /* FALL THROUGH */
79072805
LW		 727 case OP_MATCH:
728 case OP_SUBST:
729 case OP_NULL:
8990e307 730 default:
11343788
MB		 731 if (o->op_flags & OPf_KIDS) {
732 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 733 scalar(kid);
734 }
79072805
LW		 735 break;
736 case OP_LEAVE:
737 case OP_LEAVETRY:
5dc0d613 738 kid = cLISTOPo->op_first;
54310121 739 scalar(kid);
740 while (kid = kid->op_sibling) {
741 if (kid->op_sibling)
742 scalarvoid(kid);
743 else
744 scalar(kid);
745 }
0f15f207 746 WITH_THR(curcop = &compiling);
54310121 747 break;
748a9306 748 case OP_SCOPE:
79072805 749 case OP_LINESEQ:
8990e307 750 case OP_LIST:
11343788 751 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 752 if (kid->op_sibling)
753 scalarvoid(kid);
754 else
755 scalar(kid);
756 }
0f15f207 757 WITH_THR(curcop = &compiling);
79072805
LW		 758 break;
759 }
11343788 760 return o;
79072805
LW		 761}
762
763OP *
8ac85365 764scalarvoid(OP *o)
79072805
LW		 765{
766 OP *kid;
8990e307
LW		 767 char* useless = 0;
768 SV* sv;
79072805 769
54310121 770 /* assumes no premature commitment */
5dc0d613
MB		 771 if (!o || (o->op_flags & OPf_WANT) == OPf_WANT_LIST || error_count
772 || o->op_type == OP_RETURN)
11343788 773 return o;
79072805 774
5dc0d613 775 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 776
11343788 777 switch (o->op_type) {
79072805 778 default:
11343788 779 if (!(opargs[o->op_type] & OA_FOLDCONST))
8990e307 780 break;
36477c24 781 /* FALL THROUGH */
782 case OP_REPEAT:
11343788 783 if (o->op_flags & OPf_STACKED)
8990e307 784 break;
5d82c453
GA		 785 goto func_ops;
786 case OP_SUBSTR:
787 if (o->op_private == 4)
788 break;
8990e307
LW		 789 /* FALL THROUGH */
790 case OP_GVSV:
791 case OP_WANTARRAY:
792 case OP_GV:
793 case OP_PADSV:
794 case OP_PADAV:
795 case OP_PADHV:
796 case OP_PADANY:
797 case OP_AV2ARYLEN:
8990e307 798 case OP_REF:
a0d0e21e
LW		 799 case OP_REFGEN:
800 case OP_SREFGEN:
8990e307
LW		 801 case OP_DEFINED:
802 case OP_HEX:
803 case OP_OCT:
804 case OP_LENGTH:
8990e307
LW		 805 case OP_VEC:
806 case OP_INDEX:
807 case OP_RINDEX:
808 case OP_SPRINTF:
809 case OP_AELEM:
810 case OP_AELEMFAST:
811 case OP_ASLICE:
8990e307
LW		 812 case OP_HELEM:
813 case OP_HSLICE:
814 case OP_UNPACK:
815 case OP_PACK:
8990e307
LW		 816 case OP_JOIN:
817 case OP_LSLICE:
818 case OP_ANONLIST:
819 case OP_ANONHASH:
820 case OP_SORT:
821 case OP_REVERSE:
822 case OP_RANGE:
823 case OP_FLIP:
824 case OP_FLOP:
825 case OP_CALLER:
826 case OP_FILENO:
827 case OP_EOF:
828 case OP_TELL:
829 case OP_GETSOCKNAME:
830 case OP_GETPEERNAME:
831 case OP_READLINK:
832 case OP_TELLDIR:
833 case OP_GETPPID:
834 case OP_GETPGRP:
835 case OP_GETPRIORITY:
836 case OP_TIME:
837 case OP_TMS:
838 case OP_LOCALTIME:
839 case OP_GMTIME:
840 case OP_GHBYNAME:
841 case OP_GHBYADDR:
842 case OP_GHOSTENT:
843 case OP_GNBYNAME:
844 case OP_GNBYADDR:
845 case OP_GNETENT:
846 case OP_GPBYNAME:
847 case OP_GPBYNUMBER:
848 case OP_GPROTOENT:
849 case OP_GSBYNAME:
850 case OP_GSBYPORT:
851 case OP_GSERVENT:
852 case OP_GPWNAM:
853 case OP_GPWUID:
854 case OP_GGRNAM:
855 case OP_GGRGID:
856 case OP_GETLOGIN:
5d82c453 857 func_ops:
11343788
MB		 858 if (!(o->op_private & OPpLVAL_INTRO))
859 useless = op_desc[o->op_type];
8990e307
LW		 860 break;
861
862 case OP_RV2GV:
863 case OP_RV2SV:
864 case OP_RV2AV:
865 case OP_RV2HV:
11343788
MB		 866 if (!(o->op_private & OPpLVAL_INTRO) &&
867 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 868 useless = "a variable";
869 break;
79072805 870
93a17b20 871 case OP_NEXTSTATE:
8990e307 872 case OP_DBSTATE:
0f15f207 873 WITH_THR(curcop = ((COP*)o)); /* for warning below */
93a17b20
LW		 874 break;
875
79072805 876 case OP_CONST:
11343788 877 sv = cSVOPo->op_sv;
8990e307
LW		 878 if (dowarn) {
879 useless = "a constant";
880 if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
881 useless = 0;
882 else if (SvPOK(sv)) {
883 if (strnEQ(SvPVX(sv), "di", 2) ||
a0d0e21e 884 strnEQ(SvPVX(sv), "ds", 2) ||
8990e307
LW		 885 strnEQ(SvPVX(sv), "ig", 2))
886 useless = 0;
887 }
888 }
11343788 889 null(o); /* don't execute a constant */
8990e307 890 SvREFCNT_dec(sv); /* don't even remember it */
79072805
LW		 891 break;
892
893 case OP_POSTINC:
11343788
MB		 894 o->op_type = OP_PREINC; /* pre-increment is faster */
895 o->op_ppaddr = ppaddr[OP_PREINC];
79072805
LW		 896 break;
897
898 case OP_POSTDEC:
11343788
MB		 899 o->op_type = OP_PREDEC; /* pre-decrement is faster */
900 o->op_ppaddr = ppaddr[OP_PREDEC];
79072805
LW		 901 break;
902
79072805
LW		 903 case OP_OR:
904 case OP_AND:
905 case OP_COND_EXPR:
11343788 906 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 907 scalarvoid(kid);
908 break;
5aabfad6 909
a0d0e21e 910 case OP_NULL:
11343788 911 if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
0f15f207 912 WITH_THR(curcop = ((COP*)o)); /* for warning below */
11343788 913 if (o->op_flags & OPf_STACKED)
a0d0e21e 914 break;
5aabfad6 915 /* FALL THROUGH */
79072805
LW		 916 case OP_ENTERTRY:
917 case OP_ENTER:
918 case OP_SCALAR:
11343788 919 if (!(o->op_flags & OPf_KIDS))
79072805 920 break;
54310121 921 /* FALL THROUGH */
463ee0b2 922 case OP_SCOPE:
79072805
LW		 923 case OP_LEAVE:
924 case OP_LEAVETRY:
a0d0e21e 925 case OP_LEAVELOOP:
79072805 926 case OP_LINESEQ:
79072805 927 case OP_LIST:
11343788 928 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 929 scalarvoid(kid);
930 break;
c90c0ff4 931 case OP_ENTEREVAL:
5196be3e 932 scalarkids(o);
c90c0ff4 933 break;
5aabfad6 934 case OP_REQUIRE:
c90c0ff4 935 /* all requires must return a boolean value */
5196be3e
MB		 936 o->op_flags &= ~OPf_WANT;
937 return scalar(o);
a0d0e21e 938 case OP_SPLIT:
11343788 939 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 940 if (!kPMOP->op_pmreplroot)
941 deprecate("implicit split to @_");
942 }
943 break;
79072805 944 }
8990e307
LW		 945 if (useless && dowarn)
946 warn("Useless use of %s in void context", useless);
11343788 947 return o;
79072805
LW		 948}
949
950OP *
8ac85365 951listkids(OP *o)
79072805
LW		 952{
953 OP *kid;
11343788
MB		 954 if (o && o->op_flags & OPf_KIDS) {
955 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 956 list(kid);
957 }
11343788 958 return o;
79072805
LW		 959}
960
961OP *
8ac85365 962list(OP *o)
79072805
LW		 963{
964 OP *kid;
965
a0d0e21e 966 /* assumes no premature commitment */
5dc0d613
MB		 967 if (!o || (o->op_flags & OPf_WANT) || error_count
968 || o->op_type == OP_RETURN)
11343788 969 return o;
79072805 970
5dc0d613 971 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 972
11343788 973 switch (o->op_type) {
79072805
LW		 974 case OP_FLOP:
975 case OP_REPEAT:
11343788 976 list(cBINOPo->op_first);
79072805
LW		 977 break;
978 case OP_OR:
979 case OP_AND:
980 case OP_COND_EXPR:
11343788 981 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 982 list(kid);
983 break;
984 default:
985 case OP_MATCH:
986 case OP_SUBST:
987 case OP_NULL:
11343788 988 if (!(o->op_flags & OPf_KIDS))
79072805 989 break;
11343788
MB		 990 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
991 list(cBINOPo->op_first);
992 return gen_constant_list(o);
79072805
LW		 993 }
994 case OP_LIST:
11343788 995 listkids(o);
79072805
LW		 996 break;
997 case OP_LEAVE:
998 case OP_LEAVETRY:
5dc0d613 999 kid = cLISTOPo->op_first;
54310121 1000 list(kid);
1001 while (kid = kid->op_sibling) {
1002 if (kid->op_sibling)
1003 scalarvoid(kid);
1004 else
1005 list(kid);
1006 }
0f15f207 1007 WITH_THR(curcop = &compiling);
54310121 1008 break;
748a9306 1009 case OP_SCOPE:
79072805 1010 case OP_LINESEQ:
11343788 1011 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 1012 if (kid->op_sibling)
1013 scalarvoid(kid);
1014 else
1015 list(kid);
1016 }
0f15f207 1017 WITH_THR(curcop = &compiling);
79072805 1018 break;
c90c0ff4 1019 case OP_REQUIRE:
1020 /* all requires must return a boolean value */
5196be3e
MB		 1021 o->op_flags &= ~OPf_WANT;
1022 return scalar(o);
79072805 1023 }
11343788 1024 return o;
79072805
LW		 1025}
1026
1027OP *
8ac85365 1028scalarseq(OP *o)
79072805
LW		 1029{
1030 OP *kid;
1031
11343788
MB		 1032 if (o) {
1033 if (o->op_type == OP_LINESEQ ||
1034 o->op_type == OP_SCOPE ||
1035 o->op_type == OP_LEAVE ||
1036 o->op_type == OP_LEAVETRY)
463ee0b2 1037 {
0f15f207 1038 dTHR;
11343788 1039 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 1040 if (kid->op_sibling) {
463ee0b2 1041 scalarvoid(kid);
ed6116ce 1042 }
463ee0b2
LW		 1043 }
1044 curcop = &compiling;
79072805 1045 }
11343788 1046 o->op_flags &= ~OPf_PARENS;
85e6fe83 1047 if (hints & HINT_BLOCK_SCOPE)
11343788 1048 o->op_flags |= OPf_PARENS;
79072805 1049 }
8990e307 1050 else
11343788
MB		 1051 o = newOP(OP_STUB, 0);
1052 return o;
79072805
LW		 1053}
1054
76e3520e 1055STATIC OP *
8ac85365 1056modkids(OP *o, I32 type)
79072805
LW		 1057{
1058 OP *kid;
11343788
MB		 1059 if (o && o->op_flags & OPf_KIDS) {
1060 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 1061 mod(kid, type);
79072805 1062 }
11343788 1063 return o;
79072805
LW		 1064}
1065
79072805 1066OP *
8ac85365 1067mod(OP *o, I32 type)
79072805 1068{
11343788 1069 dTHR;
79072805
LW		 1070 OP *kid;
1071 SV *sv;
1072
11343788
MB		 1073 if (!o || error_count)
1074 return o;
79072805 1075
11343788 1076 switch (o->op_type) {
68dc0745 1077 case OP_UNDEF:
3e3baf6d 1078 modcount++;
5dc0d613 1079 return o;
a0d0e21e 1080 case OP_CONST:
11343788 1081 if (!(o->op_private & (OPpCONST_ARYBASE)))
a0d0e21e
LW		 1082 goto nomod;
1083 if (eval_start && eval_start->op_type == OP_CONST) {
1084 compiling.cop_arybase = (I32)SvIV(((SVOP*)eval_start)->op_sv);
1085 eval_start = 0;
1086 }
1087 else if (!type) {
1088 SAVEI32(compiling.cop_arybase);
748a9306 1089 compiling.cop_arybase = 0;
a0d0e21e
LW		 1090 }
1091 else if (type == OP_REFGEN)
1092 goto nomod;
1093 else
1094 croak("That use of $[ is unsupported");
1095 break;
5f05dabc 1096 case OP_STUB:
5196be3e 1097 if (o->op_flags & OPf_PARENS)
5f05dabc 1098 break;
1099 goto nomod;
a0d0e21e
LW		 1100 case OP_ENTERSUB:
1101 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1102 !(o->op_flags & OPf_STACKED)) {
1103 o->op_type = OP_RV2CV; /* entersub => rv2cv */
1104 o->op_ppaddr = ppaddr[OP_RV2CV];
1105 assert(cUNOPo->op_first->op_type == OP_NULL);
1106 null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1107 break;
1108 }
1109 /* FALL THROUGH */
1110 default:
a0d0e21e
LW		 1111 nomod:
1112 /* grep, foreach, subcalls, refgen */
1113 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
1114 break;
46fc3d4c 1115 yyerror(form("Can't modify %s in %s",
5dc0d613 1116 op_desc[o->op_type],
46fc3d4c 1117 type ? op_desc[type] : "local"));
11343788 1118 return o;
79072805 1119
a0d0e21e
LW		 1120 case OP_PREINC:
1121 case OP_PREDEC:
1122 case OP_POW:
1123 case OP_MULTIPLY:
1124 case OP_DIVIDE:
1125 case OP_MODULO:
1126 case OP_REPEAT:
1127 case OP_ADD:
1128 case OP_SUBTRACT:
1129 case OP_CONCAT:
1130 case OP_LEFT_SHIFT:
1131 case OP_RIGHT_SHIFT:
1132 case OP_BIT_AND:
1133 case OP_BIT_XOR:
1134 case OP_BIT_OR:
1135 case OP_I_MULTIPLY:
1136 case OP_I_DIVIDE:
1137 case OP_I_MODULO:
1138 case OP_I_ADD:
1139 case OP_I_SUBTRACT:
11343788 1140 if (!(o->op_flags & OPf_STACKED))
a0d0e21e
LW		 1141 goto nomod;
1142 modcount++;
1143 break;
1144
79072805 1145 case OP_COND_EXPR:
11343788 1146 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1147 mod(kid, type);
79072805
LW		 1148 break;
1149
1150 case OP_RV2AV:
1151 case OP_RV2HV:
93af7a87 1152 if (!type && cUNOPo->op_first->op_type != OP_GV)
706a304b 1153 croak("Can't localize through a reference");
11343788 1154 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
748a9306 1155 modcount = 10000;
11343788 1156 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1157 }
1158 /* FALL THROUGH */
79072805 1159 case OP_RV2GV:
5dc0d613 1160 if (scalar_mod_type(o, type))
3fe9a6f1 1161 goto nomod;
11343788 1162 ref(cUNOPo->op_first, o->op_type);
79072805
LW		 1163 /* FALL THROUGH */
1164 case OP_AASSIGN:
1165 case OP_ASLICE:
1166 case OP_HSLICE:
93a17b20
LW		 1167 case OP_NEXTSTATE:
1168 case OP_DBSTATE:
a0d0e21e
LW		 1169 case OP_REFGEN:
1170 case OP_CHOMP:
463ee0b2 1171 modcount = 10000;
79072805 1172 break;
463ee0b2 1173 case OP_RV2SV:
11343788 1174 if (!type && cUNOPo->op_first->op_type != OP_GV)
706a304b 1175 croak("Can't localize through a reference");
aeea060c 1176 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1177 /* FALL THROUGH */
79072805 1178 case OP_GV:
463ee0b2 1179 case OP_AV2ARYLEN:
85aff577 1180 hints |= HINT_BLOCK_SCOPE;
463ee0b2 1181 case OP_SASSIGN:
8990e307
LW		 1182 case OP_AELEMFAST:
1183 modcount++;
1184 break;
1185
748a9306
LW		 1186 case OP_PADAV:
1187 case OP_PADHV:
1188 modcount = 10000;
5196be3e
MB		 1189 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1190 return o; /* Treat \(@foo) like ordinary list. */
1191 if (scalar_mod_type(o, type))
3fe9a6f1 1192 goto nomod;
748a9306
LW		 1193 /* FALL THROUGH */
1194 case OP_PADSV:
1195 modcount++;
1196 if (!type)
1197 croak("Can't localize lexical variable %s",
11343788 1198 SvPV(*av_fetch(comppad_name, o->op_targ, 4), na));
463ee0b2
LW		 1199 break;
1200
554b3eca 1201#ifdef USE_THREADS
2faa37cc 1202 case OP_THREADSV:
554b3eca 1203 modcount++; /* XXX ??? */
554b3eca
MB		 1204 break;
1205#endif /* USE_THREADS */
1206
748a9306
LW		 1207 case OP_PUSHMARK:
1208 break;
a0d0e21e 1209
69969c6f
SB		 1210 case OP_KEYS:
1211 if (type != OP_SASSIGN)
1212 goto nomod;
5d82c453
GA		 1213 goto lvalue_func;
1214 case OP_SUBSTR:
1215 if (o->op_private == 4) /* don't allow 4 arg substr as lvalue */
1216 goto nomod;
5f05dabc 1217 /* FALL THROUGH */
a0d0e21e 1218 case OP_POS:
463ee0b2 1219 case OP_VEC:
5d82c453 1220 lvalue_func:
11343788
MB		 1221 pad_free(o->op_targ);
1222 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1223 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1224 if (o->op_flags & OPf_KIDS)
1225 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1226 break;
a0d0e21e 1227
463ee0b2
LW		 1228 case OP_AELEM:
1229 case OP_HELEM:
11343788 1230 ref(cBINOPo->op_first, o->op_type);
68dc0745 1231 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1232 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1233 o->op_private |= OPpLVAL_DEFER;
a0d0e21e 1234 modcount++;
463ee0b2
LW		 1235 break;
1236
1237 case OP_SCOPE:
1238 case OP_LEAVE:
1239 case OP_ENTER:
11343788
MB		 1240 if (o->op_flags & OPf_KIDS)
1241 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1242 break;
1243
1244 case OP_NULL:
11343788 1245 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1246 break;
11343788
MB		 1247 if (o->op_targ != OP_LIST) {
1248 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1249 break;
1250 }
1251 /* FALL THROUGH */
463ee0b2 1252 case OP_LIST:
11343788 1253 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1254 mod(kid, type);
1255 break;
1256 }
11343788 1257 o->op_flags |= OPf_MOD;
a0d0e21e
LW		 1258
1259 if (type == OP_AASSIGN || type == OP_SASSIGN)
11343788 1260 o->op_flags |= OPf_SPECIAL|OPf_REF;
a0d0e21e 1261 else if (!type) {
11343788
MB		 1262 o->op_private |= OPpLVAL_INTRO;
1263 o->op_flags &= ~OPf_SPECIAL;
ca48fea7 1264 hints |= HINT_BLOCK_SCOPE;
463ee0b2 1265 }
a0d0e21e 1266 else if (type != OP_GREPSTART && type != OP_ENTERSUB)
11343788
MB		 1267 o->op_flags |= OPf_REF;
1268 return o;
463ee0b2
LW		 1269}
1270
3fe9a6f1 1271static bool
8ac85365 1272scalar_mod_type(OP *o, I32 type)
3fe9a6f1 1273{
1274 switch (type) {
1275 case OP_SASSIGN:
5196be3e 1276 if (o->op_type == OP_RV2GV)
3fe9a6f1 1277 return FALSE;
1278 /* FALL THROUGH */
1279 case OP_PREINC:
1280 case OP_PREDEC:
1281 case OP_POSTINC:
1282 case OP_POSTDEC:
1283 case OP_I_PREINC:
1284 case OP_I_PREDEC:
1285 case OP_I_POSTINC:
1286 case OP_I_POSTDEC:
1287 case OP_POW:
1288 case OP_MULTIPLY:
1289 case OP_DIVIDE:
1290 case OP_MODULO:
1291 case OP_REPEAT:
1292 case OP_ADD:
1293 case OP_SUBTRACT:
1294 case OP_I_MULTIPLY:
1295 case OP_I_DIVIDE:
1296 case OP_I_MODULO:
1297 case OP_I_ADD:
1298 case OP_I_SUBTRACT:
1299 case OP_LEFT_SHIFT:
1300 case OP_RIGHT_SHIFT:
1301 case OP_BIT_AND:
1302 case OP_BIT_XOR:
1303 case OP_BIT_OR:
1304 case OP_CONCAT:
1305 case OP_SUBST:
1306 case OP_TRANS:
49e9fbe6
GS		 1307 case OP_READ:
1308 case OP_SYSREAD:
1309 case OP_RECV:
3fe9a6f1 1310 case OP_ANDASSIGN: /* may work later */
1311 case OP_ORASSIGN: /* may work later */
1312 return TRUE;
1313 default:
1314 return FALSE;
1315 }
1316}
1317
463ee0b2 1318OP *
8ac85365 1319refkids(OP *o, I32 type)
463ee0b2
LW		 1320{
1321 OP *kid;
11343788
MB		 1322 if (o && o->op_flags & OPf_KIDS) {
1323 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1324 ref(kid, type);
1325 }
11343788 1326 return o;
463ee0b2
LW		 1327}
1328
1329OP *
8ac85365 1330ref(OP *o, I32 type)
463ee0b2
LW		 1331{
1332 OP *kid;
463ee0b2 1333
11343788
MB		 1334 if (!o || error_count)
1335 return o;
463ee0b2 1336
11343788 1337 switch (o->op_type) {
a0d0e21e 1338 case OP_ENTERSUB:
e55aaa0e 1339 if ((type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1340 !(o->op_flags & OPf_STACKED)) {
1341 o->op_type = OP_RV2CV; /* entersub => rv2cv */
1342 o->op_ppaddr = ppaddr[OP_RV2CV];
1343 assert(cUNOPo->op_first->op_type == OP_NULL);
1344 null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
1345 o->op_flags |= OPf_SPECIAL;
8990e307
LW		 1346 }
1347 break;
aeea060c 1348
463ee0b2 1349 case OP_COND_EXPR:
11343788 1350 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2
LW		 1351 ref(kid, type);
1352 break;
8990e307 1353 case OP_RV2SV:
11343788 1354 ref(cUNOPo->op_first, o->op_type);
4633a7c4
LW		 1355 /* FALL THROUGH */
1356 case OP_PADSV:
5f05dabc 1357 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1358 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1359 : type == OP_RV2HV ? OPpDEREF_HV
1360 : OPpDEREF_SV);
11343788 1361 o->op_flags |= OPf_MOD;
a0d0e21e 1362 }
8990e307
LW		 1363 break;
1364
2faa37cc 1365 case OP_THREADSV:
a863c7d1
MB		 1366 o->op_flags |= OPf_MOD; /* XXX ??? */
1367 break;
1368
463ee0b2
LW		 1369 case OP_RV2AV:
1370 case OP_RV2HV:
aeea060c 1371 o->op_flags |= OPf_REF;
8990e307 1372 /* FALL THROUGH */
463ee0b2 1373 case OP_RV2GV:
11343788 1374 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1375 break;
8990e307 1376
463ee0b2
LW		 1377 case OP_PADAV:
1378 case OP_PADHV:
aeea060c 1379 o->op_flags |= OPf_REF;
79072805 1380 break;
aeea060c 1381
8990e307 1382 case OP_SCALAR:
79072805 1383 case OP_NULL:
11343788 1384 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1385 break;
11343788 1386 ref(cBINOPo->op_first, type);
79072805
LW		 1387 break;
1388 case OP_AELEM:
1389 case OP_HELEM:
11343788 1390 ref(cBINOPo->op_first, o->op_type);
5f05dabc 1391 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1392 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1393 : type == OP_RV2HV ? OPpDEREF_HV
1394 : OPpDEREF_SV);
11343788 1395 o->op_flags |= OPf_MOD;
8990e307 1396 }
79072805
LW		 1397 break;
1398
463ee0b2 1399 case OP_SCOPE:
79072805
LW		 1400 case OP_LEAVE:
1401 case OP_ENTER:
8990e307 1402 case OP_LIST:
11343788 1403 if (!(o->op_flags & OPf_KIDS))
79072805 1404 break;
11343788 1405 ref(cLISTOPo->op_last, type);
79072805 1406 break;
a0d0e21e
LW		 1407 default:
1408 break;
79072805 1409 }
11343788 1410 return scalar(o);
8990e307 1411
79072805
LW		 1412}
1413
1414OP *
8ac85365 1415my(OP *o)
93a17b20
LW		 1416{
1417 OP *kid;
93a17b20
LW		 1418 I32 type;
1419
11343788
MB		 1420 if (!o || error_count)
1421 return o;
93a17b20 1422
11343788 1423 type = o->op_type;
93a17b20 1424 if (type == OP_LIST) {
11343788 1425 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
93a17b20 1426 my(kid);
dab48698 1427 } else if (type == OP_UNDEF) {
7766148a 1428 return o;
dab48698 1429 } else if (type != OP_PADSV &&
93a17b20
LW		 1430 type != OP_PADAV &&
1431 type != OP_PADHV &&
1432 type != OP_PUSHMARK)
1433 {
5dc0d613 1434 yyerror(form("Can't declare %s in my", op_desc[o->op_type]));
11343788 1435 return o;
93a17b20 1436 }
11343788
MB		 1437 o->op_flags |= OPf_MOD;
1438 o->op_private |= OPpLVAL_INTRO;
1439 return o;
93a17b20
LW		 1440}
1441
1442OP *
8ac85365 1443sawparens(OP *o)
79072805
LW		 1444{
1445 if (o)
1446 o->op_flags |= OPf_PARENS;
1447 return o;
1448}
1449
1450OP *
8ac85365 1451bind_match(I32 type, OP *left, OP *right)
79072805 1452{
11343788 1453 OP *o;
79072805 1454
2ae324a7 1455 if (dowarn &&
1456 (left->op_type == OP_RV2AV ||
1457 left->op_type == OP_RV2HV ||
1458 left->op_type == OP_PADAV ||
1459 left->op_type == OP_PADHV)) {
1460 char *desc = op_desc[(right->op_type == OP_SUBST ||
1461 right->op_type == OP_TRANS)
1462 ? right->op_type : OP_MATCH];
1463 char *sample = ((left->op_type == OP_RV2AV ||
1464 left->op_type == OP_PADAV)
1465 ? "@array" : "%hash");
1466 warn("Applying %s to %s will act on scalar(%s)", desc, sample, sample);
1467 }
1468
79072805
LW		 1469 if (right->op_type == OP_MATCH ||
1470 right->op_type == OP_SUBST ||
1471 right->op_type == OP_TRANS) {
1472 right->op_flags |= OPf_STACKED;
1473 if (right->op_type != OP_MATCH)
463ee0b2 1474 left = mod(left, right->op_type);
79072805 1475 if (right->op_type == OP_TRANS)
11343788 1476 o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805 1477 else
11343788 1478 o = prepend_elem(right->op_type, scalar(left), right);
79072805 1479 if (type == OP_NOT)
11343788
MB		 1480 return newUNOP(OP_NOT, 0, scalar(o));
1481 return o;
79072805
LW		 1482 }
1483 else
1484 return bind_match(type, left,
1485 pmruntime(newPMOP(OP_MATCH, 0), right, Nullop));
1486}
1487
1488OP *
8ac85365 1489invert(OP *o)
79072805 1490{
11343788
MB		 1491 if (!o)
1492 return o;
79072805 1493 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
11343788 1494 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1495}
1496
1497OP *
8ac85365 1498scope(OP *o)
79072805
LW		 1499{
1500 if (o) {
84902520 1501 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || tainting) {
463ee0b2
LW		 1502 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1503 o->op_type = OP_LEAVE;
1504 o->op_ppaddr = ppaddr[OP_LEAVE];
1505 }
1506 else {
1507 if (o->op_type == OP_LINESEQ) {
1508 OP *kid;
1509 o->op_type = OP_SCOPE;
1510 o->op_ppaddr = ppaddr[OP_SCOPE];
1511 kid = ((LISTOP*)o)->op_first;
748a9306
LW		 1512 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE){
1513 SvREFCNT_dec(((COP*)kid)->cop_filegv);
8990e307 1514 null(kid);
748a9306 1515 }
463ee0b2
LW		 1516 }
1517 else
748a9306 1518 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
463ee0b2 1519 }
79072805
LW		 1520 }
1521 return o;
1522}
1523
b3ac6de7
IZ		 1524void
1525save_hints(void)
1526{
1527 SAVEI32(hints);
1528 SAVESPTR(GvHV(hintgv));
1529 GvHV(hintgv) = newHVhv(GvHV(hintgv));
1530 SAVEFREESV(GvHV(hintgv));
1531}
1532
a0d0e21e 1533int
8ac85365 1534block_start(int full)
79072805 1535{
11343788 1536 dTHR;
a0d0e21e 1537 int retval = savestack_ix;
b3ac6de7 1538
55497cff 1539 SAVEI32(comppad_name_floor);
1540 if (full) {
93965878 1541 if ((comppad_name_fill = AvFILLp(comppad_name)) > 0)
55497cff 1542 comppad_name_floor = comppad_name_fill;
1543 else
1544 comppad_name_floor = 0;
1545 }
1546 SAVEI32(min_intro_pending);
1547 SAVEI32(max_intro_pending);
a0d0e21e 1548 min_intro_pending = 0;
55497cff 1549 SAVEI32(comppad_name_fill);
1550 SAVEI32(padix_floor);
a0d0e21e
LW		 1551 padix_floor = padix;
1552 pad_reset_pending = FALSE;
b3ac6de7 1553 SAVEHINTS();
a0d0e21e
LW		 1554 hints &= ~HINT_BLOCK_SCOPE;
1555 return retval;
1556}
1557
1558OP*
8ac85365 1559block_end(I32 floor, OP *seq)
a0d0e21e 1560{
11343788 1561 dTHR;
a0d0e21e
LW		 1562 int needblockscope = hints & HINT_BLOCK_SCOPE;
1563 OP* retval = scalarseq(seq);
a0d0e21e
LW		 1564 LEAVE_SCOPE(floor);
1565 pad_reset_pending = FALSE;
1566 if (needblockscope)
1567 hints |= HINT_BLOCK_SCOPE; /* propagate out */
1568 pad_leavemy(comppad_name_fill);
bbce6d69 1569 cop_seqmax++;
a0d0e21e
LW		 1570 return retval;
1571}
1572
76e3520e 1573STATIC OP *
54b9620d
MB		 1574newDEFSVOP(void)
1575{
1576#ifdef USE_THREADS
1577 OP *o = newOP(OP_THREADSV, 0);
1578 o->op_targ = find_threadsv("_");
1579 return o;
1580#else
1581 return newSVREF(newGVOP(OP_GV, 0, defgv));
1582#endif /* USE_THREADS */
1583}
1584
a0d0e21e 1585void
8ac85365 1586newPROG(OP *o)
a0d0e21e 1587{
11343788 1588 dTHR;
a0d0e21e 1589 if (in_eval) {
5dc0d613 1590 eval_root = newUNOP(OP_LEAVEEVAL, ((in_eval & 4) ? OPf_SPECIAL : 0), o);
a0d0e21e
LW		 1591 eval_start = linklist(eval_root);
1592 eval_root->op_next = 0;
1593 peep(eval_start);
1594 }
1595 else {
5dc0d613 1596 if (!o)
a0d0e21e 1597 return;
11343788 1598 main_root = scope(sawparens(scalarvoid(o)));
a0d0e21e
LW		 1599 curcop = &compiling;
1600 main_start = LINKLIST(main_root);
1601 main_root->op_next = 0;
1602 peep(main_start);
748a9306 1603 compcv = 0;
3841441e 1604
4fdae800 1605 /* Register with debugger */
84902520 1606 if (PERLDB_INTER) {
3841441e 1607 CV *cv = perl_get_cv("DB::postponed", FALSE);
3841441e
CS		 1608 if (cv) {
1609 dSP;
924508f0 1610 PUSHMARK(SP);
3841441e
CS		 1611 XPUSHs((SV*)compiling.cop_filegv);
1612 PUTBACK;
1613 perl_call_sv((SV*)cv, G_DISCARD);
1614 }
1615 }
79072805 1616 }
79072805
LW		 1617}
1618
1619OP *
8ac85365 1620localize(OP *o, I32 lex)
79072805
LW		 1621{
1622 if (o->op_flags & OPf_PARENS)
1623 list(o);
8990e307 1624 else {
8990e307
LW		 1625 if (dowarn && bufptr > oldbufptr && bufptr[-1] == ',') {
1626 char *s;
1627 for (s = bufptr; *s && (isALNUM(*s) || strchr("@$%, ",*s)); s++) ;
a0d0e21e 1628 if (*s == ';' || *s == '=')
8990e307
LW		 1629 warn("Parens missing around \"%s\" list", lex ? "my" : "local");
1630 }
1631 }
93a17b20 1632 in_my = FALSE;
c750a3ec 1633 in_my_stash = Nullhv;
93a17b20
LW		 1634 if (lex)
1635 return my(o);
1636 else
463ee0b2 1637 return mod(o, OP_NULL); /* a bit kludgey */
79072805
LW		 1638}
1639
1640OP *
8ac85365 1641jmaybe(OP *o)
79072805
LW		 1642{
1643 if (o->op_type == OP_LIST) {
554b3eca
MB		 1644 OP *o2;
1645#ifdef USE_THREADS
2faa37cc 1646 o2 = newOP(OP_THREADSV, 0);
54b9620d 1647 o2->op_targ = find_threadsv(";");
554b3eca
MB		 1648#else
1649 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
1650#endif /* USE_THREADS */
1651 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 1652 }
1653 return o;
1654}
1655
1656OP *
8ac85365 1657fold_constants(register OP *o)
79072805 1658{
11343788 1659 dTHR;
79072805
LW		 1660 register OP *curop;
1661 I32 type = o->op_type;
748a9306 1662 SV *sv;
79072805
LW		 1663
1664 if (opargs[type] & OA_RETSCALAR)
1665 scalar(o);
1666 if (opargs[type] & OA_TARGET)
ed6116ce 1667 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 1668
85e6fe83 1669 if ((opargs[type] & OA_OTHERINT) && (hints & HINT_INTEGER))
a0d0e21e 1670 o->op_ppaddr = ppaddr[type = ++(o->op_type)];
85e6fe83 1671
79072805
LW		 1672 if (!(opargs[type] & OA_FOLDCONST))
1673 goto nope;
1674
de939608
CS		 1675 switch (type) {
1676 case OP_SPRINTF:
1677 case OP_UCFIRST:
1678 case OP_LCFIRST:
1679 case OP_UC:
1680 case OP_LC:
69dcf70c
MB		 1681 case OP_SLT:
1682 case OP_SGT:
1683 case OP_SLE:
1684 case OP_SGE:
1685 case OP_SCMP:
1686
de939608
CS		 1687 if (o->op_private & OPpLOCALE)
1688 goto nope;
1689 }
1690
a0d0e21e
LW		 1691 if (error_count)
1692 goto nope; /* Don't try to run w/ errors */
1693
79072805 1694 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
93a17b20
LW		 1695 if (curop->op_type != OP_CONST &&
1696 curop->op_type != OP_LIST &&
1697 curop->op_type != OP_SCALAR &&
a0d0e21e 1698 curop->op_type != OP_NULL &&
93a17b20 1699 curop->op_type != OP_PUSHMARK) {
79072805
LW		 1700 goto nope;
1701 }
1702 }
1703
1704 curop = LINKLIST(o);
1705 o->op_next = 0;
1706 op = curop;
76e3520e 1707 CALLRUNOPS();
748a9306
LW		 1708 sv = *(stack_sp--);
1709 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
79072805 1710 pad_swipe(o->op_targ);
748a9306
LW		 1711 else if (SvTEMP(sv)) { /* grab mortal temp? */
1712 (void)SvREFCNT_inc(sv);
1713 SvTEMP_off(sv);
85e6fe83 1714 }
79072805
LW		 1715 op_free(o);
1716 if (type == OP_RV2GV)
b1cb66bf 1717 return newGVOP(OP_GV, 0, (GV*)sv);
748a9306 1718 else {
ee580363
GS		 1719 /* try to smush double to int, but don't smush -2.0 to -2 */
1720 if ((SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK)) == SVf_NOK &&
1721 type != OP_NEGATE)
1722 {
748a9306 1723 IV iv = SvIV(sv);
ee580363 1724 if ((double)iv == SvNV(sv)) {
748a9306
LW		 1725 SvREFCNT_dec(sv);
1726 sv = newSViv(iv);
1727 }
b1cb66bf 1728 else
1729 SvIOK_off(sv); /* undo SvIV() damage */
748a9306
LW		 1730 }
1731 return newSVOP(OP_CONST, 0, sv);
1732 }
aeea060c 1733
79072805
LW		 1734 nope:
1735 if (!(opargs[type] & OA_OTHERINT))
1736 return o;
79072805 1737
85e6fe83 1738 if (!(hints & HINT_INTEGER)) {
a0d0e21e 1739 if (type == OP_DIVIDE || !(o->op_flags & OPf_KIDS))
85e6fe83
LW		 1740 return o;
1741
1742 for (curop = ((UNOP*)o)->op_first; curop; curop = curop->op_sibling) {
1743 if (curop->op_type == OP_CONST) {
b1cb66bf 1744 if (SvIOK(((SVOP*)curop)->op_sv))
85e6fe83
LW		 1745 continue;
1746 return o;
1747 }
1748 if (opargs[curop->op_type] & OA_RETINTEGER)
79072805
LW		 1749 continue;
1750 return o;
1751 }
a0d0e21e 1752 o->op_ppaddr = ppaddr[++(o->op_type)];
79072805
LW		 1753 }
1754
79072805
LW		 1755 return o;
1756}
1757
1758OP *
8ac85365 1759gen_constant_list(register OP *o)
79072805 1760{
11343788 1761 dTHR;
79072805 1762 register OP *curop;
79072805 1763 I32 oldtmps_floor = tmps_floor;
79072805 1764
a0d0e21e
LW		 1765 list(o);
1766 if (error_count)
1767 return o; /* Don't attempt to run with errors */
1768
1769 op = curop = LINKLIST(o);
1770 o->op_next = 0;
11343788 1771 pp_pushmark(ARGS);
76e3520e 1772 CALLRUNOPS();
a0d0e21e 1773 op = curop;
11343788 1774 pp_anonlist(ARGS);
79072805 1775 tmps_floor = oldtmps_floor;
79072805
LW		 1776
1777 o->op_type = OP_RV2AV;
1778 o->op_ppaddr = ppaddr[OP_RV2AV];
79072805 1779 curop = ((UNOP*)o)->op_first;
a0d0e21e 1780 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*stack_sp--));
79072805 1781 op_free(curop);
79072805
LW		 1782 linklist(o);
1783 return list(o);
1784}
1785
1786OP *
8ac85365 1787convert(I32 type, I32 flags, OP *o)
79072805
LW		 1788{
1789 OP *kid;
a0d0e21e 1790 OP *last = 0;
79072805 1791
11343788
MB		 1792 if (!o || o->op_type != OP_LIST)
1793 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 1794 else
5dc0d613 1795 o->op_flags &= ~OPf_WANT;
79072805 1796
8990e307 1797 if (!(opargs[type] & OA_MARK))
11343788 1798 null(cLISTOPo->op_first);
8990e307 1799
11343788
MB		 1800 o->op_type = type;
1801 o->op_ppaddr = ppaddr[type];
1802 o->op_flags |= flags;
79072805 1803
11343788
MB		 1804 o = CHECKOP(type, o);
1805 if (o->op_type != type)
1806 return o;
79072805 1807
11343788 1808 if (cLISTOPo->op_children < 7) {
79072805 1809 /* XXX do we really need to do this if we're done appending?? */
11343788 1810 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805 1811 last = kid;
11343788 1812 cLISTOPo->op_last = last; /* in case check substituted last arg */
79072805
LW		 1813 }
1814
11343788 1815 return fold_constants(o);
79072805
LW		 1816}
1817
1818/* List constructors */
1819
1820OP *
8ac85365 1821append_elem(I32 type, OP *first, OP *last)
79072805
LW		 1822{
1823 if (!first)
1824 return last;
8990e307
LW		 1825
1826 if (!last)
79072805 1827 return first;
8990e307 1828
a0d0e21e
LW		 1829 if (first->op_type != type || type==OP_LIST && first->op_flags & OPf_PARENS)
1830 return newLISTOP(type, 0, first, last);
79072805 1831
a0d0e21e
LW		 1832 if (first->op_flags & OPf_KIDS)
1833 ((LISTOP*)first)->op_last->op_sibling = last;
1834 else {
1835 first->op_flags |= OPf_KIDS;
1836 ((LISTOP*)first)->op_first = last;
1837 }
1838 ((LISTOP*)first)->op_last = last;
1839 ((LISTOP*)first)->op_children++;
1840 return first;
79072805
LW		 1841}
1842
1843OP *
8ac85365 1844append_list(I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 1845{
1846 if (!first)
1847 return (OP*)last;
8990e307
LW		 1848
1849 if (!last)
79072805 1850 return (OP*)first;
8990e307
LW		 1851
1852 if (first->op_type != type)
79072805 1853 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307
LW		 1854
1855 if (last->op_type != type)
79072805
LW		 1856 return append_elem(type, (OP*)first, (OP*)last);
1857
1858 first->op_last->op_sibling = last->op_first;
1859 first->op_last = last->op_last;
1860 first->op_children += last->op_children;
1861 if (first->op_children)
1862 last->op_flags |= OPf_KIDS;
1863
1864 Safefree(last);
1865 return (OP*)first;
1866}
1867
1868OP *
8ac85365 1869prepend_elem(I32 type, OP *first, OP *last)
79072805
LW		 1870{
1871 if (!first)
1872 return last;
8990e307
LW		 1873
1874 if (!last)
79072805 1875 return first;
8990e307
LW		 1876
1877 if (last->op_type == type) {
1878 if (type == OP_LIST) { /* already a PUSHMARK there */
1879 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
1880 ((LISTOP*)last)->op_first->op_sibling = first;
1881 }
1882 else {
1883 if (!(last->op_flags & OPf_KIDS)) {
1884 ((LISTOP*)last)->op_last = first;
1885 last->op_flags |= OPf_KIDS;
1886 }
1887 first->op_sibling = ((LISTOP*)last)->op_first;
1888 ((LISTOP*)last)->op_first = first;
79072805 1889 }
79072805
LW		 1890 ((LISTOP*)last)->op_children++;
1891 return last;
1892 }
1893
1894 return newLISTOP(type, 0, first, last);
1895}
1896
1897/* Constructors */
1898
1899OP *
8ac85365 1900newNULLLIST(void)
79072805 1901{
8990e307
LW		 1902 return newOP(OP_STUB, 0);
1903}
1904
1905OP *
8ac85365 1906force_list(OP *o)
8990e307 1907{
11343788
MB		 1908 if (!o || o->op_type != OP_LIST)
1909 o = newLISTOP(OP_LIST, 0, o, Nullop);
1910 null(o);
1911 return o;
79072805
LW		 1912}
1913
1914OP *
8ac85365 1915newLISTOP(I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 1916{
1917 LISTOP *listop;
1918
1919 Newz(1101, listop, 1, LISTOP);
1920
1921 listop->op_type = type;
1922 listop->op_ppaddr = ppaddr[type];
1923 listop->op_children = (first != 0) + (last != 0);
1924 listop->op_flags = flags;
79072805
LW		 1925
1926 if (!last && first)
1927 last = first;
1928 else if (!first && last)
1929 first = last;
8990e307
LW		 1930 else if (first)
1931 first->op_sibling = last;
79072805
LW		 1932 listop->op_first = first;
1933 listop->op_last = last;
8990e307
LW		 1934 if (type == OP_LIST) {
1935 OP* pushop;
1936 pushop = newOP(OP_PUSHMARK, 0);
1937 pushop->op_sibling = first;
1938 listop->op_first = pushop;
1939 listop->op_flags |= OPf_KIDS;
1940 if (!last)
1941 listop->op_last = pushop;
1942 }
1943 else if (listop->op_children)
1944 listop->op_flags |= OPf_KIDS;
79072805
LW		 1945
1946 return (OP*)listop;
1947}
1948
1949OP *
8ac85365 1950newOP(I32 type, I32 flags)
79072805 1951{
11343788
MB		 1952 OP *o;
1953 Newz(1101, o, 1, OP);
1954 o->op_type = type;
1955 o->op_ppaddr = ppaddr[type];
1956 o->op_flags = flags;
79072805 1957
11343788
MB		 1958 o->op_next = o;
1959 o->op_private = 0 + (flags >> 8);
79072805 1960 if (opargs[type] & OA_RETSCALAR)
11343788 1961 scalar(o);
79072805 1962 if (opargs[type] & OA_TARGET)
11343788
MB		 1963 o->op_targ = pad_alloc(type, SVs_PADTMP);
1964 return CHECKOP(type, o);
79072805
LW		 1965}
1966
1967OP *
8ac85365 1968newUNOP(I32 type, I32 flags, OP *first)
79072805
LW		 1969{
1970 UNOP *unop;
1971
93a17b20 1972 if (!first)
aeea060c 1973 first = newOP(OP_STUB, 0);
8990e307
LW		 1974 if (opargs[type] & OA_MARK)
1975 first = force_list(first);
93a17b20 1976
79072805
LW		 1977 Newz(1101, unop, 1, UNOP);
1978 unop->op_type = type;
1979 unop->op_ppaddr = ppaddr[type];
1980 unop->op_first = first;
1981 unop->op_flags = flags | OPf_KIDS;
c07a80fd 1982 unop->op_private = 1 | (flags >> 8);
c277df42
IZ		 1983#if 1
1984 if(type == OP_STUDY && first->op_type == OP_MATCH) {
1985 first->op_type = OP_PUSHRE;
1986 first->op_ppaddr = ppaddr[OP_PUSHRE];
1987 }
1988#endif
e50aee73 1989 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 1990 if (unop->op_next)
1991 return (OP*)unop;
1992
a0d0e21e 1993 return fold_constants((OP *) unop);
79072805
LW		 1994}
1995
1996OP *
8ac85365 1997newBINOP(I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 1998{
1999 BINOP *binop;
2000 Newz(1101, binop, 1, BINOP);
2001
2002 if (!first)
2003 first = newOP(OP_NULL, 0);
2004
2005 binop->op_type = type;
2006 binop->op_ppaddr = ppaddr[type];
2007 binop->op_first = first;
2008 binop->op_flags = flags | OPf_KIDS;
2009 if (!last) {
2010 last = first;
c07a80fd 2011 binop->op_private = 1 | (flags >> 8);
79072805
LW		 2012 }
2013 else {
c07a80fd 2014 binop->op_private = 2 | (flags >> 8);
79072805
LW		 2015 first->op_sibling = last;
2016 }
2017
e50aee73 2018 binop = (BINOP*)CHECKOP(type, binop);
79072805
LW		 2019 if (binop->op_next)
2020 return (OP*)binop;
2021
2022 binop->op_last = last = binop->op_first->op_sibling;
2023
a0d0e21e 2024 return fold_constants((OP *)binop);
79072805
LW		 2025}
2026
2027OP *
8ac85365 2028pmtrans(OP *o, OP *expr, OP *repl)
79072805 2029{
79072805
LW		 2030 SV *tstr = ((SVOP*)expr)->op_sv;
2031 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 2032 STRLEN tlen;
2033 STRLEN rlen;
ec49126f 2034 register U8 *t = (U8*)SvPV(tstr, tlen);
2035 register U8 *r = (U8*)SvPV(rstr, rlen);
79072805
LW		 2036 register I32 i;
2037 register I32 j;
8ac85365 2038 I32 Delete;
79072805 2039 I32 complement;
5d06d08e 2040 I32 squash;
79072805
LW		 2041 register short *tbl;
2042
11343788
MB		 2043 tbl = (short*)cPVOPo->op_pv;
2044 complement = o->op_private & OPpTRANS_COMPLEMENT;
8ac85365 2045 Delete = o->op_private & OPpTRANS_DELETE;
5d06d08e 2046 squash = o->op_private & OPpTRANS_SQUASH;
79072805
LW		 2047
2048 if (complement) {
2049 Zero(tbl, 256, short);
2050 for (i = 0; i < tlen; i++)
ec49126f 2051 tbl[t[i]] = -1;
79072805
LW		 2052 for (i = 0, j = 0; i < 256; i++) {
2053 if (!tbl[i]) {
2054 if (j >= rlen) {
8ac85365 2055 if (Delete)
79072805
LW		 2056 tbl[i] = -2;
2057 else if (rlen)
ec49126f 2058 tbl[i] = r[j-1];
79072805
LW		 2059 else
2060 tbl[i] = i;
2061 }
2062 else
ec49126f 2063 tbl[i] = r[j++];
79072805
LW		 2064 }
2065 }
2066 }
2067 else {
8ac85365 2068 if (!rlen && !Delete) {
79072805 2069 r = t; rlen = tlen;
5d06d08e
MB		 2070 if (!squash)
2071 o->op_private |= OPpTRANS_COUNTONLY;
79072805
LW		 2072 }
2073 for (i = 0; i < 256; i++)
2074 tbl[i] = -1;
2075 for (i = 0, j = 0; i < tlen; i++,j++) {
2076 if (j >= rlen) {
8ac85365 2077 if (Delete) {
ec49126f 2078 if (tbl[t[i]] == -1)
2079 tbl[t[i]] = -2;
79072805
LW		 2080 continue;
2081 }
2082 --j;
2083 }
ec49126f 2084 if (tbl[t[i]] == -1)
2085 tbl[t[i]] = r[j];
79072805
LW		 2086 }
2087 }
2088 op_free(expr);
2089 op_free(repl);
2090
11343788 2091 return o;
79072805
LW		 2092}
2093
2094OP *
8ac85365 2095newPMOP(I32 type, I32 flags)
79072805 2096{
11343788 2097 dTHR;
79072805
LW		 2098 PMOP *pmop;
2099
2100 Newz(1101, pmop, 1, PMOP);
2101 pmop->op_type = type;
2102 pmop->op_ppaddr = ppaddr[type];
2103 pmop->op_flags = flags;
c07a80fd 2104 pmop->op_private = 0 | (flags >> 8);
79072805 2105
b3eb6a9b
GS		 2106 if (hints & HINT_RE_TAINT)
2107 pmop->op_pmpermflags |= PMf_RETAINT;
36477c24 2108 if (hints & HINT_LOCALE)
b3eb6a9b
GS		 2109 pmop->op_pmpermflags |= PMf_LOCALE;
2110 pmop->op_pmflags = pmop->op_pmpermflags;
36477c24 2111
79072805 2112 /* link into pm list */
a0d0e21e 2113 if (type != OP_TRANS && curstash) {
79072805
LW		 2114 pmop->op_pmnext = HvPMROOT(curstash);
2115 HvPMROOT(curstash) = pmop;
2116 }
2117
2118 return (OP*)pmop;
2119}
2120
2121OP *
8ac85365 2122pmruntime(OP *o, OP *expr, OP *repl)
79072805 2123{
5c0ca799 2124 dTHR;
79072805
LW		 2125 PMOP *pm;
2126 LOGOP *rcop;
ce862d02 2127 I32 repl_has_vars = 0;
79072805 2128
11343788
MB		 2129 if (o->op_type == OP_TRANS)
2130 return pmtrans(o, expr, repl);
79072805 2131
3e3baf6d 2132 hints |= HINT_BLOCK_SCOPE;
11343788 2133 pm = (PMOP*)o;
79072805
LW		 2134
2135 if (expr->op_type == OP_CONST) {
463ee0b2 2136 STRLEN plen;
79072805 2137 SV *pat = ((SVOP*)expr)->op_sv;
463ee0b2 2138 char *p = SvPV(pat, plen);
11343788 2139 if ((o->op_flags & OPf_SPECIAL) && strEQ(p, " ")) {
93a17b20 2140 sv_setpvn(pat, "\\s+", 3);
463ee0b2 2141 p = SvPV(pat, plen);
79072805
LW		 2142 pm->op_pmflags |= PMf_SKIPWHITE;
2143 }
15e52e56 2144 pm->op_pmregexp = CALLREGCOMP(p, p + plen, pm);
aeea060c 2145 if (strEQ("\\s+", pm->op_pmregexp->precomp))
85e6fe83 2146 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2147 op_free(expr);
2148 }
2149 else {
2cd61cdb
IZ		 2150 if (pm->op_pmflags & PMf_KEEP || !(hints & HINT_RE_EVAL))
2151 expr = newUNOP((!(hints & HINT_RE_EVAL)
2152 ? OP_REGCRESET
2153 : OP_REGCMAYBE),0,expr);
463ee0b2 2154
79072805
LW		 2155 Newz(1101, rcop, 1, LOGOP);
2156 rcop->op_type = OP_REGCOMP;
2157 rcop->op_ppaddr = ppaddr[OP_REGCOMP];
2158 rcop->op_first = scalar(expr);
2cd61cdb
IZ		 2159 rcop->op_flags |= ((hints & HINT_RE_EVAL)
2160 ? (OPf_SPECIAL | OPf_KIDS)
2161 : OPf_KIDS);
79072805 2162 rcop->op_private = 1;
11343788 2163 rcop->op_other = o;
79072805
LW		 2164
2165 /* establish postfix order */
2cd61cdb 2166 if (pm->op_pmflags & PMf_KEEP || !(hints & HINT_RE_EVAL)) {
463ee0b2
LW		 2167 LINKLIST(expr);
2168 rcop->op_next = expr;
2169 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2170 }
2171 else {
2172 rcop->op_next = LINKLIST(expr);
2173 expr->op_next = (OP*)rcop;
2174 }
79072805 2175
11343788 2176 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2177 }
2178
2179 if (repl) {
748a9306
LW		 2180 OP *curop;
2181 if (pm->op_pmflags & PMf_EVAL)
2182 curop = 0;
554b3eca 2183#ifdef USE_THREADS
2faa37cc 2184 else if (repl->op_type == OP_THREADSV
554b3eca 2185 && strchr("&`'123456789+",
54b9620d 2186 threadsv_names[repl->op_targ]))
554b3eca
MB		 2187 {
2188 curop = 0;
2189 }
2190#endif /* USE_THREADS */
748a9306
LW		 2191 else if (repl->op_type == OP_CONST)
2192 curop = repl;
79072805 2193 else {
79072805
LW		 2194 OP *lastop = 0;
2195 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
2196 if (opargs[curop->op_type] & OA_DANGEROUS) {
554b3eca 2197#ifdef USE_THREADS
ce862d02
IZ		 2198 if (curop->op_type == OP_THREADSV) {
2199 repl_has_vars = 1;
be949f6f 2200 if (strchr("&`'123456789+", curop->op_private))
ce862d02 2201 break;
554b3eca
MB		 2202 }
2203#else
79072805
LW		 2204 if (curop->op_type == OP_GV) {
2205 GV *gv = ((GVOP*)curop)->op_gv;
ce862d02 2206 repl_has_vars = 1;
93a17b20 2207 if (strchr("&`'123456789+", *GvENAME(gv)))
79072805
LW		 2208 break;
2209 }
554b3eca 2210#endif /* USE_THREADS */
79072805
LW		 2211 else if (curop->op_type == OP_RV2CV)
2212 break;
2213 else if (curop->op_type == OP_RV2SV ||
2214 curop->op_type == OP_RV2AV ||
2215 curop->op_type == OP_RV2HV ||
2216 curop->op_type == OP_RV2GV) {
2217 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2218 break;
2219 }
748a9306
LW		 2220 else if (curop->op_type == OP_PADSV ||
2221 curop->op_type == OP_PADAV ||
2222 curop->op_type == OP_PADHV ||
554b3eca 2223 curop->op_type == OP_PADANY) {
ce862d02 2224 repl_has_vars = 1;
748a9306 2225 }
79072805
LW		 2226 else
2227 break;
2228 }
2229 lastop = curop;
2230 }
748a9306 2231 }
ce862d02
IZ		 2232 if (curop == repl
2233 && !(repl_has_vars
2234 && (!pm->op_pmregexp
2235 || pm->op_pmregexp->reganch & ROPT_EVAL_SEEN))) {
748a9306 2236 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2237 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2238 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2239 }
2240 else {
ce862d02
IZ		 2241 if (curop == repl && !pm->op_pmregexp) { /* Has variables. */
2242 pm->op_pmflags |= PMf_MAYBE_CONST;
2243 pm->op_pmpermflags |= PMf_MAYBE_CONST;
2244 }
748a9306
LW		 2245 Newz(1101, rcop, 1, LOGOP);
2246 rcop->op_type = OP_SUBSTCONT;
2247 rcop->op_ppaddr = ppaddr[OP_SUBSTCONT];
2248 rcop->op_first = scalar(repl);
2249 rcop->op_flags |= OPf_KIDS;
2250 rcop->op_private = 1;
11343788 2251 rcop->op_other = o;
748a9306
LW		 2252
2253 /* establish postfix order */
2254 rcop->op_next = LINKLIST(repl);
2255 repl->op_next = (OP*)rcop;
2256
2257 pm->op_pmreplroot = scalar((OP*)rcop);
2258 pm->op_pmreplstart = LINKLIST(rcop);
2259 rcop->op_next = 0;
79072805
LW		 2260 }
2261 }
2262
2263 return (OP*)pm;
2264}
2265
2266OP *
8ac85365 2267newSVOP(I32 type, I32 flags, SV *sv)
79072805
LW		 2268{
2269 SVOP *svop;
2270 Newz(1101, svop, 1, SVOP);
2271 svop->op_type = type;
2272 svop->op_ppaddr = ppaddr[type];
2273 svop->op_sv = sv;
2274 svop->op_next = (OP*)svop;
2275 svop->op_flags = flags;
2276 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2277 scalar((OP*)svop);
79072805 2278 if (opargs[type] & OA_TARGET)
ed6116ce 2279 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2280 return CHECKOP(type, svop);
79072805
LW		 2281}
2282
2283OP *
8ac85365 2284newGVOP(I32 type, I32 flags, GV *gv)
79072805 2285{
11343788 2286 dTHR;
79072805
LW		 2287 GVOP *gvop;
2288 Newz(1101, gvop, 1, GVOP);
2289 gvop->op_type = type;
2290 gvop->op_ppaddr = ppaddr[type];
8990e307 2291 gvop->op_gv = (GV*)SvREFCNT_inc(gv);
79072805
LW		 2292 gvop->op_next = (OP*)gvop;
2293 gvop->op_flags = flags;
2294 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2295 scalar((OP*)gvop);
79072805 2296 if (opargs[type] & OA_TARGET)
ed6116ce 2297 gvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2298 return CHECKOP(type, gvop);
79072805
LW		 2299}
2300
2301OP *
8ac85365 2302newPVOP(I32 type, I32 flags, char *pv)
79072805
LW		 2303{
2304 PVOP *pvop;
2305 Newz(1101, pvop, 1, PVOP);
2306 pvop->op_type = type;
2307 pvop->op_ppaddr = ppaddr[type];
2308 pvop->op_pv = pv;
2309 pvop->op_next = (OP*)pvop;
2310 pvop->op_flags = flags;
2311 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2312 scalar((OP*)pvop);
79072805 2313 if (opargs[type] & OA_TARGET)
ed6116ce 2314 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2315 return CHECKOP(type, pvop);
79072805
LW		 2316}
2317
79072805 2318void
8ac85365 2319package(OP *o)
79072805 2320{
11343788 2321 dTHR;
93a17b20 2322 SV *sv;
79072805
LW		 2323
2324 save_hptr(&curstash);
2325 save_item(curstname);
11343788 2326 if (o) {
463ee0b2
LW		 2327 STRLEN len;
2328 char *name;
11343788 2329 sv = cSVOPo->op_sv;
463ee0b2 2330 name = SvPV(sv, len);
b1cb66bf 2331 curstash = gv_stashpvn(name,len,TRUE);
463ee0b2 2332 sv_setpvn(curstname, name, len);
11343788 2333 op_free(o);
93a17b20
LW		 2334 }
2335 else {
2336 sv_setpv(curstname,"<none>");
2337 curstash = Nullhv;
2338 }
79072805 2339 copline = NOLINE;
8990e307 2340 expect = XSTATE;
79072805
LW		 2341}
2342
85e6fe83 2343void
8ac85365 2344utilize(int aver, I32 floor, OP *version, OP *id, OP *arg)
85e6fe83 2345{
a0d0e21e
LW		 2346 OP *pack;
2347 OP *meth;
2348 OP *rqop;
2349 OP *imop;
b1cb66bf 2350 OP *veop;
85e6fe83 2351
a0d0e21e
LW		 2352 if (id->op_type != OP_CONST)
2353 croak("Module name must be constant");
85e6fe83 2354
b1cb66bf 2355 veop = Nullop;
2356
2357 if(version != Nullop) {
2358 SV *vesv = ((SVOP*)version)->op_sv;
2359
2360 if (arg == Nullop && !SvNIOK(vesv)) {
2361 arg = version;
2362 }
2363 else {
2364 OP *pack;
2365 OP *meth;
2366
2367 if (version->op_type != OP_CONST || !SvNIOK(vesv))
2368 croak("Version number must be constant number");
2369
2370 /* Make copy of id so we don't free it twice */
2371 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
2372
2373 /* Fake up a method call to VERSION */
2374 meth = newSVOP(OP_CONST, 0, newSVpv("VERSION", 7));
2375 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
2376 append_elem(OP_LIST,
2377 prepend_elem(OP_LIST, pack, list(version)),
2378 newUNOP(OP_METHOD, 0, meth)));
2379 }
2380 }
aeea060c 2381
a0d0e21e 2382 /* Fake up an import/unimport */
4633a7c4
LW		 2383 if (arg && arg->op_type == OP_STUB)
2384 imop = arg; /* no import on explicit () */
b1cb66bf 2385 else if(SvNIOK(((SVOP*)id)->op_sv)) {
2386 imop = Nullop; /* use 5.0; */
2387 }
4633a7c4
LW		 2388 else {
2389 /* Make copy of id so we don't free it twice */
2390 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
4633a7c4
LW		 2391 meth = newSVOP(OP_CONST, 0,
2392 aver
2393 ? newSVpv("import", 6)
2394 : newSVpv("unimport", 8)
2395 );
2396 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
a0d0e21e
LW		 2397 append_elem(OP_LIST,
2398 prepend_elem(OP_LIST, pack, list(arg)),
2399 newUNOP(OP_METHOD, 0, meth)));
4633a7c4
LW		 2400 }
2401
2402 /* Fake up a require */
2403 rqop = newUNOP(OP_REQUIRE, 0, id);
a0d0e21e
LW		 2404
2405 /* Fake up the BEGIN {}, which does its thing immediately. */
c07a80fd 2406 newSUB(floor,
a0d0e21e 2407 newSVOP(OP_CONST, 0, newSVpv("BEGIN", 5)),
4633a7c4 2408 Nullop,
a0d0e21e 2409 append_elem(OP_LINESEQ,
b1cb66bf 2410 append_elem(OP_LINESEQ,
2411 newSTATEOP(0, Nullch, rqop),
2412 newSTATEOP(0, Nullch, veop)),
a0d0e21e 2413 newSTATEOP(0, Nullch, imop) ));
85e6fe83 2414
85e6fe83
LW		 2415 copline = NOLINE;
2416 expect = XSTATE;
2417}
2418
79072805 2419OP *
8ac85365 2420newSLICEOP(I32 flags, OP *subscript, OP *listval)
79072805
LW		 2421{
2422 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 2423 list(force_list(subscript)),
2424 list(force_list(listval)) );
79072805
LW		 2425}
2426
76e3520e 2427STATIC I32
8ac85365 2428list_assignment(register OP *o)
79072805 2429{
11343788 2430 if (!o)
79072805
LW		 2431 return TRUE;
2432
11343788
MB		 2433 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
2434 o = cUNOPo->op_first;
79072805 2435
11343788
MB		 2436 if (o->op_type == OP_COND_EXPR) {
2437 I32 t = list_assignment(cCONDOPo->op_first->op_sibling);
2438 I32 f = list_assignment(cCONDOPo->op_first->op_sibling->op_sibling);
79072805
LW		 2439
2440 if (t && f)
2441 return TRUE;
2442 if (t || f)
2443 yyerror("Assignment to both a list and a scalar");
2444 return FALSE;
2445 }
2446
11343788
MB		 2447 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
2448 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
2449 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 2450 return TRUE;
2451
11343788 2452 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 2453 return TRUE;
2454
11343788 2455 if (o->op_type == OP_RV2SV)
79072805
LW		 2456 return FALSE;
2457
2458 return FALSE;
2459}
2460
2461OP *
8ac85365 2462newASSIGNOP(I32 flags, OP *left, I32 optype, OP *right)
79072805 2463{
11343788 2464 OP *o;
79072805 2465
a0d0e21e
LW		 2466 if (optype) {
2467 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN) {
2468 return newLOGOP(optype, 0,
2469 mod(scalar(left), optype),
2470 newUNOP(OP_SASSIGN, 0, scalar(right)));
2471 }
2472 else {
2473 return newBINOP(optype, OPf_STACKED,
2474 mod(scalar(left), optype), scalar(right));
2475 }
2476 }
2477
79072805 2478 if (list_assignment(left)) {
6ee623d5 2479 dTHR;
463ee0b2 2480 modcount = 0;
748a9306 2481 eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 2482 left = mod(left, OP_AASSIGN);
748a9306
LW		 2483 if (eval_start)
2484 eval_start = 0;
2485 else {
a0d0e21e
LW		 2486 op_free(left);
2487 op_free(right);
2488 return Nullop;
2489 }
11343788 2490 o = newBINOP(OP_AASSIGN, flags,
8990e307
LW		 2491 list(force_list(right)),
2492 list(force_list(left)) );
11343788 2493 o->op_private = 0 | (flags >> 8);
a0d0e21e 2494 if (!(left->op_private & OPpLVAL_INTRO)) {
79072805 2495 OP *curop;
11343788 2496 OP *lastop = o;
79072805 2497 generation++;
11343788 2498 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
79072805
LW		 2499 if (opargs[curop->op_type] & OA_DANGEROUS) {
2500 if (curop->op_type == OP_GV) {
2501 GV *gv = ((GVOP*)curop)->op_gv;
2502 if (gv == defgv || SvCUR(gv) == generation)
2503 break;
2504 SvCUR(gv) = generation;
2505 }
748a9306
LW		 2506 else if (curop->op_type == OP_PADSV ||
2507 curop->op_type == OP_PADAV ||
2508 curop->op_type == OP_PADHV ||
2509 curop->op_type == OP_PADANY) {
2510 SV **svp = AvARRAY(comppad_name);
8e07c86e 2511 SV *sv = svp[curop->op_targ];
748a9306
LW		 2512 if (SvCUR(sv) == generation)
2513 break;
2514 SvCUR(sv) = generation; /* (SvCUR not used any more) */
2515 }
79072805
LW		 2516 else if (curop->op_type == OP_RV2CV)
2517 break;
2518 else if (curop->op_type == OP_RV2SV ||
2519 curop->op_type == OP_RV2AV ||
2520 curop->op_type == OP_RV2HV ||
2521 curop->op_type == OP_RV2GV) {
2522 if (lastop->op_type != OP_GV) /* funny deref? */
2523 break;
2524 }
2525 else
2526 break;
2527 }
2528 lastop = curop;
2529 }
11343788
MB		 2530 if (curop != o)
2531 o->op_private = OPpASSIGN_COMMON;
79072805 2532 }
c07a80fd 2533 if (right && right->op_type == OP_SPLIT) {
2534 OP* tmpop;
2535 if ((tmpop = ((LISTOP*)right)->op_first) &&
2536 tmpop->op_type == OP_PUSHRE)
2537 {
2538 PMOP *pm = (PMOP*)tmpop;
2539 if (left->op_type == OP_RV2AV &&
2540 !(left->op_private & OPpLVAL_INTRO) &&
11343788 2541 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 2542 {
2543 tmpop = ((UNOP*)left)->op_first;
2544 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
2545 pm->op_pmreplroot = (OP*)((GVOP*)tmpop)->op_gv;
2546 pm->op_pmflags |= PMf_ONCE;
11343788 2547 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 2548 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
2549 tmpop->op_sibling = Nullop; /* don't free split */
2550 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 2551 op_free(o); /* blow off assign */
54310121 2552 right->op_flags &= ~OPf_WANT;
a5f75d66 2553 /* "I don't know and I don't care." */
c07a80fd 2554 return right;
2555 }
2556 }
2557 else {
2558 if (modcount < 10000 &&
2559 ((LISTOP*)right)->op_last->op_type == OP_CONST)
2560 {
2561 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
2562 if (SvIVX(sv) == 0)
2563 sv_setiv(sv, modcount+1);
2564 }
2565 }
2566 }
2567 }
11343788 2568 return o;
79072805
LW		 2569 }
2570 if (!right)
2571 right = newOP(OP_UNDEF, 0);
2572 if (right->op_type == OP_READLINE) {
2573 right->op_flags |= OPf_STACKED;
463ee0b2 2574 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 2575 }
a0d0e21e 2576 else {
748a9306 2577 eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 2578 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 2579 scalar(right), mod(scalar(left), OP_SASSIGN) );
748a9306
LW		 2580 if (eval_start)
2581 eval_start = 0;
2582 else {
11343788 2583 op_free(o);
a0d0e21e
LW		 2584 return Nullop;
2585 }
2586 }
11343788 2587 return o;
79072805
LW		 2588}
2589
2590OP *
8ac85365 2591newSTATEOP(I32 flags, char *label, OP *o)
79072805 2592{
11343788 2593 dTHR;
bbce6d69 2594 U32 seq = intro_my();
79072805
LW		 2595 register COP *cop;
2596
2597 Newz(1101, cop, 1, COP);
84902520 2598 if (PERLDB_LINE && curcop->cop_line && curstash != debstash) {
8990e307
LW		 2599 cop->op_type = OP_DBSTATE;
2600 cop->op_ppaddr = ppaddr[ OP_DBSTATE ];
2601 }
2602 else {
2603 cop->op_type = OP_NEXTSTATE;
2604 cop->op_ppaddr = ppaddr[ OP_NEXTSTATE ];
2605 }
79072805 2606 cop->op_flags = flags;
c07a80fd 2607 cop->op_private = 0 | (flags >> 8);
ff0cee69 2608#ifdef NATIVE_HINTS
2609 cop->op_private |= NATIVE_HINTS;
2610#endif
79072805
LW		 2611 cop->op_next = (OP*)cop;
2612
463ee0b2
LW		 2613 if (label) {
2614 cop->cop_label = label;
85e6fe83 2615 hints |= HINT_BLOCK_SCOPE;
463ee0b2 2616 }
bbce6d69 2617 cop->cop_seq = seq;
a0d0e21e 2618 cop->cop_arybase = curcop->cop_arybase;
79072805
LW		 2619
2620 if (copline == NOLINE)
2621 cop->cop_line = curcop->cop_line;
2622 else {
2623 cop->cop_line = copline;
2624 copline = NOLINE;
2625 }
44a8e56a 2626 cop->cop_filegv = (GV*)SvREFCNT_inc(curcop->cop_filegv);
79072805
LW		 2627 cop->cop_stash = curstash;
2628
84902520 2629 if (PERLDB_LINE && curstash != debstash) {
93a17b20
LW		 2630 SV **svp = av_fetch(GvAV(curcop->cop_filegv),(I32)cop->cop_line, FALSE);
2631 if (svp && *svp != &sv_undef && !SvIOK(*svp)) {
a0d0e21e 2632 (void)SvIOK_on(*svp);
a5f75d66 2633 SvIVX(*svp) = 1;
93a17b20
LW		 2634 SvSTASH(*svp) = (HV*)cop;
2635 }
2636 }
2637
11343788 2638 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 2639}
2640
bbce6d69 2641/* "Introduce" my variables to visible status. */
2642U32
8ac85365 2643intro_my(void)
bbce6d69 2644{
2645 SV **svp;
2646 SV *sv;
2647 I32 i;
2648
2649 if (! min_intro_pending)
2650 return cop_seqmax;
2651
2652 svp = AvARRAY(comppad_name);
2653 for (i = min_intro_pending; i <= max_intro_pending; i++) {
2654 if ((sv = svp[i]) && sv != &sv_undef && !SvIVX(sv)) {
2655 SvIVX(sv) = 999999999; /* Don't know scope end yet. */
2656 SvNVX(sv) = (double)cop_seqmax;
2657 }
2658 }
2659 min_intro_pending = 0;
2660 comppad_name_fill = max_intro_pending; /* Needn't search higher */
2661 return cop_seqmax++;
2662}
2663
79072805 2664OP *
8ac85365 2665newLOGOP(I32 type, I32 flags, OP *first, OP *other)
79072805 2666{
883ffac3
CS		 2667 return new_logop(type, flags, &first, &other);
2668}
2669
3bd495df 2670STATIC OP *
883ffac3
CS		 2671new_logop(I32 type, I32 flags, OP** firstp, OP** otherp)
2672{
11343788 2673 dTHR;
79072805 2674 LOGOP *logop;
11343788 2675 OP *o;
883ffac3
CS		 2676 OP *first = *firstp;
2677 OP *other = *otherp;
79072805 2678
a0d0e21e
LW		 2679 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
2680 return newBINOP(type, flags, scalar(first), scalar(other));
2681
8990e307 2682 scalarboolean(first);
79072805
LW		 2683 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
2684 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
2685 if (type == OP_AND || type == OP_OR) {
2686 if (type == OP_AND)
2687 type = OP_OR;
2688 else
2689 type = OP_AND;
11343788 2690 o = first;
883ffac3 2691 first = *firstp = cUNOPo->op_first;
11343788
MB		 2692 if (o->op_next)
2693 first->op_next = o->op_next;
2694 cUNOPo->op_first = Nullop;
2695 op_free(o);
79072805
LW		 2696 }
2697 }
2698 if (first->op_type == OP_CONST) {
93a17b20 2699 if (dowarn && (first->op_private & OPpCONST_BARE))
c07a80fd 2700 warn("Probable precedence problem on %s", op_desc[type]);
79072805
LW		 2701 if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
2702 op_free(first);
883ffac3 2703 *firstp = Nullop;
79072805
LW		 2704 return other;
2705 }
2706 else {
2707 op_free(other);
883ffac3 2708 *otherp = Nullop;
79072805
LW		 2709 return first;
2710 }
2711 }
2712 else if (first->op_type == OP_WANTARRAY) {
2713 if (type == OP_AND)
2714 list(other);
2715 else
2716 scalar(other);
2717 }
a6006777 2718 else if (dowarn && (first->op_flags & OPf_KIDS)) {
2719 OP *k1 = ((UNOP*)first)->op_first;
2720 OP *k2 = k1->op_sibling;
2721 OPCODE warnop = 0;
2722 switch (first->op_type)
2723 {
2724 case OP_NULL:
2725 if (k2 && k2->op_type == OP_READLINE
2726 && (k2->op_flags & OPf_STACKED)
55d729e4 2727 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
a6006777 2728 warnop = k2->op_type;
2729 break;
2730
2731 case OP_SASSIGN:
68dc0745 2732 if (k1->op_type == OP_READDIR
2733 || k1->op_type == OP_GLOB
2734 || k1->op_type == OP_EACH)
a6006777 2735 warnop = k1->op_type;
2736 break;
2737 }
8ebc5c01 2738 if (warnop) {
2739 line_t oldline = curcop->cop_line;
2740 curcop->cop_line = copline;
68dc0745 2741 warn("Value of %s%s can be \"0\"; test with defined()",
2742 op_desc[warnop],
2743 ((warnop == OP_READLINE || warnop == OP_GLOB)
2744 ? " construct" : "() operator"));
2745 curcop->cop_line = oldline;
8ebc5c01 2746 }
a6006777 2747 }
79072805
LW		 2748
2749 if (!other)
2750 return first;
2751
a0d0e21e
LW		 2752 if (type == OP_ANDASSIGN || type == OP_ORASSIGN)
2753 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
2754
79072805
LW		 2755 Newz(1101, logop, 1, LOGOP);
2756
2757 logop->op_type = type;
2758 logop->op_ppaddr = ppaddr[type];
2759 logop->op_first = first;
2760 logop->op_flags = flags | OPf_KIDS;
2761 logop->op_other = LINKLIST(other);
c07a80fd 2762 logop->op_private = 1 | (flags >> 8);
79072805
LW		 2763
2764 /* establish postfix order */
2765 logop->op_next = LINKLIST(first);
2766 first->op_next = (OP*)logop;
2767 first->op_sibling = other;
2768
11343788
MB		 2769 o = newUNOP(OP_NULL, 0, (OP*)logop);
2770 other->op_next = o;
79072805 2771
11343788 2772 return o;
79072805
LW		 2773}
2774
2775OP *
8ac85365 2776newCONDOP(I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 2777{
11343788 2778 dTHR;
79072805 2779 CONDOP *condop;
11343788 2780 OP *o;
79072805 2781
b1cb66bf 2782 if (!falseop)
2783 return newLOGOP(OP_AND, 0, first, trueop);
2784 if (!trueop)
2785 return newLOGOP(OP_OR, 0, first, falseop);
79072805 2786
8990e307 2787 scalarboolean(first);
79072805
LW		 2788 if (first->op_type == OP_CONST) {
2789 if (SvTRUE(((SVOP*)first)->op_sv)) {
2790 op_free(first);
b1cb66bf 2791 op_free(falseop);
2792 return trueop;
79072805
LW		 2793 }
2794 else {
2795 op_free(first);
b1cb66bf 2796 op_free(trueop);
2797 return falseop;
79072805
LW		 2798 }
2799 }
2800 else if (first->op_type == OP_WANTARRAY) {
b1cb66bf 2801 list(trueop);
2802 scalar(falseop);
79072805
LW		 2803 }
2804 Newz(1101, condop, 1, CONDOP);
2805
2806 condop->op_type = OP_COND_EXPR;
2807 condop->op_ppaddr = ppaddr[OP_COND_EXPR];
2808 condop->op_first = first;
2809 condop->op_flags = flags | OPf_KIDS;
b1cb66bf 2810 condop->op_true = LINKLIST(trueop);
2811 condop->op_false = LINKLIST(falseop);
c07a80fd 2812 condop->op_private = 1 | (flags >> 8);
79072805
LW		 2813
2814 /* establish postfix order */
2815 condop->op_next = LINKLIST(first);
2816 first->op_next = (OP*)condop;
2817
b1cb66bf 2818 first->op_sibling = trueop;
2819 trueop->op_sibling = falseop;
11343788 2820 o = newUNOP(OP_NULL, 0, (OP*)condop);
79072805 2821
5dc0d613
MB		 2822 trueop->op_next = o;
2823 falseop->op_next = o;
79072805 2824
11343788 2825 return o;
79072805
LW		 2826}
2827
2828OP *
8ac85365 2829newRANGE(I32 flags, OP *left, OP *right)
79072805 2830{
b35b2403 2831 dTHR;
79072805
LW		 2832 CONDOP *condop;
2833 OP *flip;
2834 OP *flop;
11343788 2835 OP *o;
79072805
LW		 2836
2837 Newz(1101, condop, 1, CONDOP);
2838
2839 condop->op_type = OP_RANGE;
2840 condop->op_ppaddr = ppaddr[OP_RANGE];
2841 condop->op_first = left;
2842 condop->op_flags = OPf_KIDS;
2843 condop->op_true = LINKLIST(left);
2844 condop->op_false = LINKLIST(right);
c07a80fd 2845 condop->op_private = 1 | (flags >> 8);
79072805
LW		 2846
2847 left->op_sibling = right;
2848
2849 condop->op_next = (OP*)condop;
2850 flip = newUNOP(OP_FLIP, flags, (OP*)condop);
2851 flop = newUNOP(OP_FLOP, 0, flip);
11343788 2852 o = newUNOP(OP_NULL, 0, flop);
79072805
LW		 2853 linklist(flop);
2854
2855 left->op_next = flip;
2856 right->op_next = flop;
2857
ed6116ce 2858 condop->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805 2859 sv_upgrade(PAD_SV(condop->op_targ), SVt_PVNV);
ed6116ce 2860 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 2861 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
2862
2863 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
2864 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
2865
11343788 2866 flip->op_next = o;
79072805 2867 if (!flip->op_private || !flop->op_private)
11343788 2868 linklist(o); /* blow off optimizer unless constant */
79072805 2869
11343788 2870 return o;
79072805
LW		 2871}
2872
2873OP *
8ac85365 2874newLOOPOP(I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 2875{
11343788 2876 dTHR;
463ee0b2 2877 OP* listop;
11343788 2878 OP* o;
463ee0b2 2879 int once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 2880 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
93a17b20 2881
463ee0b2
LW		 2882 if (expr) {
2883 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
2884 return block; /* do {} while 0 does once */
fb73857a 2885 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
2886 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 2887 expr = newUNOP(OP_DEFINED, 0,
54b9620d 2888 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 2889 } else if (expr->op_flags & OPf_KIDS) {
2890 OP *k1 = ((UNOP*)expr)->op_first;
2891 OP *k2 = (k1) ? k1->op_sibling : NULL;
2892 switch (expr->op_type) {
2893 case OP_NULL:
2894 if (k2 && k2->op_type == OP_READLINE
2895 && (k2->op_flags & OPf_STACKED)
2896 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
2897 expr = newUNOP(OP_DEFINED, 0, expr);
2898 break;
2899
2900 case OP_SASSIGN:
2901 if (k1->op_type == OP_READDIR
2902 || k1->op_type == OP_GLOB
2903 || k1->op_type == OP_EACH)
2904 expr = newUNOP(OP_DEFINED, 0, expr);
2905 break;
2906 }
774d564b 2907 }
463ee0b2 2908 }
93a17b20 2909
8990e307 2910 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
883ffac3 2911 o = new_logop(OP_AND, 0, &expr, &listop);
463ee0b2 2912
883ffac3
CS		 2913 if (listop)
2914 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 2915
11343788
MB		 2916 if (once && o != listop)
2917 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 2918
11343788
MB		 2919 if (o == listop)
2920 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 2921
11343788
MB		 2922 o->op_flags |= flags;
2923 o = scope(o);
2924 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
2925 return o;
79072805
LW		 2926}
2927
2928OP *
8ac85365 2929newWHILEOP(I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *expr, OP *block, OP *cont)
79072805 2930{
11343788 2931 dTHR;
79072805
LW		 2932 OP *redo;
2933 OP *next = 0;
2934 OP *listop;
11343788 2935 OP *o;
79072805
LW		 2936 OP *condop;
2937
fb73857a 2938 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
2939 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB))) {
748a9306 2940 expr = newUNOP(OP_DEFINED, 0,
54b9620d 2941 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 2942 } else if (expr && (expr->op_flags & OPf_KIDS)) {
2943 OP *k1 = ((UNOP*)expr)->op_first;
2944 OP *k2 = (k1) ? k1->op_sibling : NULL;
2945 switch (expr->op_type) {
2946 case OP_NULL:
2947 if (k2 && k2->op_type == OP_READLINE
2948 && (k2->op_flags & OPf_STACKED)
2949 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
2950 expr = newUNOP(OP_DEFINED, 0, expr);
2951 break;
2952
2953 case OP_SASSIGN:
2954 if (k1->op_type == OP_READDIR
2955 || k1->op_type == OP_GLOB
2956 || k1->op_type == OP_EACH)
2957 expr = newUNOP(OP_DEFINED, 0, expr);
2958 break;
2959 }
748a9306 2960 }
79072805
LW		 2961
2962 if (!block)
2963 block = newOP(OP_NULL, 0);
2964
2965 if (cont)
2966 next = LINKLIST(cont);
fb73857a 2967 if (expr) {
79072805 2968 cont = append_elem(OP_LINESEQ, cont, newOP(OP_UNSTACK, 0));
fb73857a 2969 if ((line_t)whileline != NOLINE) {
2970 copline = whileline;
2971 cont = append_elem(OP_LINESEQ, cont,
2972 newSTATEOP(0, Nullch, Nullop));
2973 }
2974 }
79072805 2975
463ee0b2 2976 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 2977 redo = LINKLIST(listop);
2978
2979 if (expr) {
883ffac3
CS		 2980 copline = whileline;
2981 scalar(listop);
2982 o = new_logop(OP_AND, 0, &expr, &listop);
11343788 2983 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 2984 op_free(expr); /* oops, it's a while (0) */
463ee0b2 2985 op_free((OP*)loop);
883ffac3 2986 return Nullop; /* listop already freed by new_logop */
463ee0b2 2987 }
883ffac3
CS		 2988 if (listop)
2989 ((LISTOP*)listop)->op_last->op_next = condop =
2990 (o == listop ? redo : LINKLIST(o));
79072805
LW		 2991 if (!next)
2992 next = condop;
2993 }
2994 else
11343788 2995 o = listop;
79072805
LW		 2996
2997 if (!loop) {
2998 Newz(1101,loop,1,LOOP);
2999 loop->op_type = OP_ENTERLOOP;
3000 loop->op_ppaddr = ppaddr[OP_ENTERLOOP];
3001 loop->op_private = 0;
3002 loop->op_next = (OP*)loop;
3003 }
3004
11343788 3005 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 3006
3007 loop->op_redoop = redo;
11343788 3008 loop->op_lastop = o;
79072805
LW		 3009
3010 if (next)
3011 loop->op_nextop = next;
3012 else
11343788 3013 loop->op_nextop = o;
79072805 3014
11343788
MB		 3015 o->op_flags |= flags;
3016 o->op_private |= (flags >> 8);
3017 return o;
79072805
LW		 3018}
3019
3020OP *
8990e307 3021newFOROP(I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *block,OP *cont)
79072805
LW		 3022{
3023 LOOP *loop;
fb73857a 3024 OP *wop;
85e6fe83 3025 int padoff = 0;
4633a7c4 3026 I32 iterflags = 0;
79072805 3027
79072805 3028 if (sv) {
85e6fe83 3029 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
748a9306
LW		 3030 sv->op_type = OP_RV2GV;
3031 sv->op_ppaddr = ppaddr[OP_RV2GV];
79072805 3032 }
85e6fe83
LW		 3033 else if (sv->op_type == OP_PADSV) { /* private variable */
3034 padoff = sv->op_targ;
3035 op_free(sv);
3036 sv = Nullop;
3037 }
54b9620d
MB		 3038 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
3039 padoff = sv->op_targ;
3040 iterflags |= OPf_SPECIAL;
3041 op_free(sv);
3042 sv = Nullop;
3043 }
79072805 3044 else
c07a80fd 3045 croak("Can't use %s for loop variable", op_desc[sv->op_type]);
79072805
LW		 3046 }
3047 else {
54b9620d
MB		 3048#ifdef USE_THREADS
3049 padoff = find_threadsv("_");
3050 iterflags |= OPf_SPECIAL;
3051#else
79072805 3052 sv = newGVOP(OP_GV, 0, defgv);
54b9620d 3053#endif
79072805 3054 }
5f05dabc 3055 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
89ea2908 3056 expr = mod(force_list(scalar(ref(expr, OP_ITER))), OP_GREPSTART);
4633a7c4
LW		 3057 iterflags |= OPf_STACKED;
3058 }
89ea2908
GA		 3059 else if (expr->op_type == OP_NULL &&
3060 (expr->op_flags & OPf_KIDS) &&
3061 ((BINOP*)expr)->op_first->op_type == OP_FLOP)
3062 {
3063 /* Basically turn for($x..$y) into the same as for($x,$y), but we
3064 * set the STACKED flag to indicate that these values are to be
3065 * treated as min/max values by 'pp_iterinit'.
3066 */
3067 UNOP* flip = (UNOP*)((UNOP*)((BINOP*)expr)->op_first)->op_first;
3068 CONDOP* range = (CONDOP*) flip->op_first;
3069 OP* left = range->op_first;
3070 OP* right = left->op_sibling;
5152d7c7 3071 LISTOP* listop;
89ea2908
GA		 3072
3073 range->op_flags &= ~OPf_KIDS;
3074 range->op_first = Nullop;
3075
5152d7c7
GS		 3076 listop = (LISTOP*)newLISTOP(OP_LIST, 0, left, right);
3077 listop->op_first->op_next = range->op_true;
89ea2908 3078 left->op_next = range->op_false;
5152d7c7
GS		 3079 right->op_next = (OP*)listop;
3080 listop->op_next = listop->op_first;
89ea2908
GA		 3081
3082 op_free(expr);
5152d7c7 3083 expr = (OP*)(listop);
89ea2908
GA		 3084 null(expr);
3085 iterflags |= OPf_STACKED;
3086 }
3087 else {
3088 expr = mod(force_list(expr), OP_GREPSTART);
3089 }
3090
3091
4633a7c4 3092 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
89ea2908 3093 append_elem(OP_LIST, expr, scalar(sv))));
85e6fe83
LW		 3094 assert(!loop->op_next);
3095 Renew(loop, 1, LOOP);
3096 loop->op_targ = padoff;
fb73857a 3097 wop = newWHILEOP(flags, 1, loop, forline, newOP(OP_ITER, 0), block, cont);
3098 copline = forline;
3099 return newSTATEOP(0, label, wop);
79072805
LW		 3100}
3101
8990e307 3102OP*
8ac85365 3103newLOOPEX(I32 type, OP *label)
8990e307 3104{
11343788
MB		 3105 dTHR;
3106 OP *o;
8990e307 3107 if (type != OP_GOTO || label->op_type == OP_CONST) {
cdaebead
MB		 3108 /* "last()" means "last" */
3109 if (label->op_type == OP_STUB && (label->op_flags & OPf_PARENS))
3110 o = newOP(type, OPf_SPECIAL);
3111 else {
3112 o = newPVOP(type, 0, savepv(label->op_type == OP_CONST
3113 ? SvPVx(((SVOP*)label)->op_sv, na)
3114 : ""));
3115 }
8990e307
LW		 3116 op_free(label);
3117 }
3118 else {
a0d0e21e
LW		 3119 if (label->op_type == OP_ENTERSUB)
3120 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
11343788 3121 o = newUNOP(type, OPf_STACKED, label);
8990e307 3122 }
85e6fe83 3123 hints |= HINT_BLOCK_SCOPE;
11343788 3124 return o;
8990e307
LW		 3125}
3126
79072805 3127void
8ac85365 3128cv_undef(CV *cv)
79072805 3129{
11343788
MB		 3130 dTHR;
3131#ifdef USE_THREADS
e858de61
MB		 3132 if (CvMUTEXP(cv)) {
3133 MUTEX_DESTROY(CvMUTEXP(cv));
3134 Safefree(CvMUTEXP(cv));
3135 CvMUTEXP(cv) = 0;
3136 }
11343788
MB		 3137#endif /* USE_THREADS */
3138
a0d0e21e 3139 if (!CvXSUB(cv) && CvROOT(cv)) {
11343788
MB		 3140#ifdef USE_THREADS
3141 if (CvDEPTH(cv) || (CvOWNER(cv) && CvOWNER(cv) != thr))
3142 croak("Can't undef active subroutine");
3143#else
a0d0e21e
LW		 3144 if (CvDEPTH(cv))
3145 croak("Can't undef active subroutine");
11343788 3146#endif /* USE_THREADS */
8990e307 3147 ENTER;
a0d0e21e
LW		 3148
3149 SAVESPTR(curpad);
3150 curpad = 0;
3151
a5f75d66 3152 if (!CvCLONED(cv))
748a9306 3153 op_free(CvROOT(cv));
79072805 3154 CvROOT(cv) = Nullop;
8990e307 3155 LEAVE;
79072805 3156 }
1d5db326 3157 SvPOK_off((SV*)cv); /* forget prototype */
44a8e56a 3158 CvFLAGS(cv) = 0;
8e07c86e
AD		 3159 SvREFCNT_dec(CvGV(cv));
3160 CvGV(cv) = Nullgv;
3161 SvREFCNT_dec(CvOUTSIDE(cv));
3162 CvOUTSIDE(cv) = Nullcv;
3163 if (CvPADLIST(cv)) {
8ebc5c01 3164 /* may be during global destruction */
3165 if (SvREFCNT(CvPADLIST(cv))) {
93965878 3166 I32 i = AvFILLp(CvPADLIST(cv));
8ebc5c01 3167 while (i >= 0) {
3168 SV** svp = av_fetch(CvPADLIST(cv), i--, FALSE);
46fc3d4c 3169 SV* sv = svp ? *svp : Nullsv;
3170 if (!sv)
3171 continue;
3172 if (sv == (SV*)comppad_name)
3173 comppad_name = Nullav;
3174 else if (sv == (SV*)comppad) {
3175 comppad = Nullav;
3176 curpad = Null(SV**);
3177 }
3178 SvREFCNT_dec(sv);
8ebc5c01 3179 }
3180 SvREFCNT_dec((SV*)CvPADLIST(cv));
8e07c86e 3181 }
8e07c86e
AD		 3182 CvPADLIST(cv) = Nullav;
3183 }
79072805
LW		 3184}
3185
5f05dabc 3186#ifdef DEBUG_CLOSURES
76e3520e 3187STATIC void
5f05dabc 3188cv_dump(cv)
3189CV* cv;
3190{
3191 CV *outside = CvOUTSIDE(cv);
3192 AV* padlist = CvPADLIST(cv);
4fdae800 3193 AV* pad_name;
3194 AV* pad;
3195 SV** pname;
3196 SV** ppad;
5f05dabc 3197 I32 ix;
3198
fb73857a 3199 PerlIO_printf(Perl_debug_log, "\tCV=0x%lx (%s), OUTSIDE=0x%lx (%s)\n",
ab50184a
CS		 3200 cv,
3201 (CvANON(cv) ? "ANON"
3202 : (cv == main_cv) ? "MAIN"
07055b4c 3203 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 3204 : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
ab50184a
CS		 3205 outside,
3206 (!outside ? "null"
3207 : CvANON(outside) ? "ANON"
3208 : (outside == main_cv) ? "MAIN"
07055b4c 3209 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 3210 : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
5f05dabc 3211
4fdae800 3212 if (!padlist)
3213 return;
3214
3215 pad_name = (AV*)*av_fetch(padlist, 0, FALSE);
3216 pad = (AV*)*av_fetch(padlist, 1, FALSE);
3217 pname = AvARRAY(pad_name);
3218 ppad = AvARRAY(pad);
3219
93965878 3220 for (ix = 1; ix <= AvFILLp(pad_name); ix++) {
5f05dabc 3221 if (SvPOK(pname[ix]))
fb73857a 3222 PerlIO_printf(Perl_debug_log, "\t%4d. 0x%lx (%s\"%s\" %ld-%ld)\n",
4fdae800 3223 ix, ppad[ix],
3224 SvFAKE(pname[ix]) ? "FAKE " : "",
3225 SvPVX(pname[ix]),
ab50184a
CS		 3226 (long)I_32(SvNVX(pname[ix])),
3227 (long)SvIVX(pname[ix]));
5f05dabc 3228 }
3229}
3230#endif /* DEBUG_CLOSURES */
3231
76e3520e 3232STATIC CV *
8ac85365 3233cv_clone2(CV *proto, CV *outside)
748a9306 3234{
11343788 3235 dTHR;
748a9306
LW		 3236 AV* av;
3237 I32 ix;
3238 AV* protopadlist = CvPADLIST(proto);
3239 AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE);
3240 AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE);
5f05dabc 3241 SV** pname = AvARRAY(protopad_name);
3242 SV** ppad = AvARRAY(protopad);
93965878
NIS		 3243 I32 fname = AvFILLp(protopad_name);
3244 I32 fpad = AvFILLp(protopad);
748a9306
LW		 3245 AV* comppadlist;
3246 CV* cv;
3247
07055b4c
CS		 3248 assert(!CvUNIQUE(proto));
3249
748a9306
LW		 3250 ENTER;
3251 SAVESPTR(curpad);
3252 SAVESPTR(comppad);
46fc3d4c 3253 SAVESPTR(comppad_name);
748a9306
LW		 3254 SAVESPTR(compcv);
3255
3256 cv = compcv = (CV*)NEWSV(1104,0);
fa83b5b6 3257 sv_upgrade((SV *)cv, SvTYPE(proto));
a5f75d66 3258 CvCLONED_on(cv);
5f05dabc 3259 if (CvANON(proto))
3260 CvANON_on(cv);
748a9306 3261
11343788 3262#ifdef USE_THREADS
12ca11f6 3263 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3264 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 3265 CvOWNER(cv) = 0;
3266#endif /* USE_THREADS */
748a9306 3267 CvFILEGV(cv) = CvFILEGV(proto);
44a8e56a 3268 CvGV(cv) = (GV*)SvREFCNT_inc(CvGV(proto));
748a9306
LW		 3269 CvSTASH(cv) = CvSTASH(proto);
3270 CvROOT(cv) = CvROOT(proto);
3271 CvSTART(cv) = CvSTART(proto);
5f05dabc 3272 if (outside)
3273 CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside);
748a9306 3274
68dc0745 3275 if (SvPOK(proto))
3276 sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto));
3277
46fc3d4c 3278 comppad_name = newAV();
3279 for (ix = fname; ix >= 0; ix--)
3280 av_store(comppad_name, ix, SvREFCNT_inc(pname[ix]));
748a9306
LW		 3281
3282 comppad = newAV();
3283
3284 comppadlist = newAV();
3285 AvREAL_off(comppadlist);
46fc3d4c 3286 av_store(comppadlist, 0, (SV*)comppad_name);
b355b4e0 3287 av_store(comppadlist, 1, (SV*)comppad);
748a9306 3288 CvPADLIST(cv) = comppadlist;
93965878 3289 av_fill(comppad, AvFILLp(protopad));
748a9306
LW		 3290 curpad = AvARRAY(comppad);
3291
3292 av = newAV(); /* will be @_ */
3293 av_extend(av, 0);
3294 av_store(comppad, 0, (SV*)av);
3295 AvFLAGS(av) = AVf_REIFY;
3296
9607fc9c 3297 for (ix = fpad; ix > 0; ix--) {
3298 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
aa689395 3299 if (namesv && namesv != &sv_undef) {
3300 char *name = SvPVX(namesv); /* XXX */
3301 if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */
3302 I32 off = pad_findlex(name, ix, SvIVX(namesv),
5f05dabc 3303 CvOUTSIDE(cv), cxstack_ix);
3304 if (!off)
3305 curpad[ix] = SvREFCNT_inc(ppad[ix]);
3306 else if (off != ix)
748a9306
LW		 3307 croak("panic: cv_clone: %s", name);
3308 }
3309 else { /* our own lexical */
aa689395 3310 SV* sv;
5f05dabc 3311 if (*name == '&') {
3312 /* anon code -- we'll come back for it */
3313 sv = SvREFCNT_inc(ppad[ix]);
3314 }
3315 else if (*name == '@')
3316 sv = (SV*)newAV();
748a9306 3317 else if (*name == '%')
5f05dabc 3318 sv = (SV*)newHV();
748a9306 3319 else
5f05dabc 3320 sv = NEWSV(0,0);
3321 if (!SvPADBUSY(sv))
3322 SvPADMY_on(sv);
3323 curpad[ix] = sv;
748a9306
LW		 3324 }
3325 }
3326 else {
aa689395 3327 SV* sv = NEWSV(0,0);
748a9306 3328 SvPADTMP_on(sv);
5f05dabc 3329 curpad[ix] = sv;
748a9306
LW		 3330 }
3331 }
3332
5f05dabc 3333 /* Now that vars are all in place, clone nested closures. */
3334
9607fc9c 3335 for (ix = fpad; ix > 0; ix--) {
3336 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
aa689395 3337 if (namesv
3338 && namesv != &sv_undef
3339 && !(SvFLAGS(namesv) & SVf_FAKE)
3340 && *SvPVX(namesv) == '&'
5f05dabc 3341 && CvCLONE(ppad[ix]))
3342 {
3343 CV *kid = cv_clone2((CV*)ppad[ix], cv);
3344 SvREFCNT_dec(ppad[ix]);
3345 CvCLONE_on(kid);
3346 SvPADMY_on(kid);
3347 curpad[ix] = (SV*)kid;
748a9306
LW		 3348 }
3349 }
3350
5f05dabc 3351#ifdef DEBUG_CLOSURES
ab50184a
CS		 3352 PerlIO_printf(Perl_debug_log, "Cloned inside:\n");
3353 cv_dump(outside);
3354 PerlIO_printf(Perl_debug_log, " from:\n");
5f05dabc 3355 cv_dump(proto);
ab50184a 3356 PerlIO_printf(Perl_debug_log, " to:\n");
5f05dabc 3357 cv_dump(cv);
3358#endif
3359
748a9306
LW		 3360 LEAVE;
3361 return cv;
3362}
3363
3364CV *
8ac85365 3365cv_clone(CV *proto)
5f05dabc 3366{
3367 return cv_clone2(proto, CvOUTSIDE(proto));
3368}
3369
3fe9a6f1 3370void
8ac85365 3371cv_ckproto(CV *cv, GV *gv, char *p)
3fe9a6f1 3372{
3373 if ((!p != !SvPOK(cv)) || (p && strNE(p, SvPVX(cv)))) {
46fc3d4c 3374 SV* msg = sv_newmortal();
3fe9a6f1 3375 SV* name = Nullsv;
3376
3377 if (gv)
46fc3d4c 3378 gv_efullname3(name = sv_newmortal(), gv, Nullch);
3379 sv_setpv(msg, "Prototype mismatch:");
3380 if (name)
fc36a67e 3381 sv_catpvf(msg, " sub %_", name);
3fe9a6f1 3382 if (SvPOK(cv))
46fc3d4c 3383 sv_catpvf(msg, " (%s)", SvPVX(cv));
3384 sv_catpv(msg, " vs ");
3385 if (p)
3386 sv_catpvf(msg, "(%s)", p);
3387 else
3388 sv_catpv(msg, "none");
fc36a67e 3389 warn("%_", msg);
3fe9a6f1 3390 }
3391}
3392
760ac839 3393SV *
8ac85365 3394cv_const_sv(CV *cv)
760ac839 3395{
54310121 3396 if (!cv || !SvPOK(cv) || SvCUR(cv))
3397 return Nullsv;
fe5e78ed
GS		 3398 return op_const_sv(CvSTART(cv), cv);
3399}
760ac839 3400
fe5e78ed
GS		 3401SV *
3402op_const_sv(OP *o, CV *cv)
3403{
3404 SV *sv = Nullsv;
3405
3406 if(!o)
3407 return Nullsv;
3408
3409 if(o->op_type == OP_LINESEQ && cLISTOPo->op_first)
3410 o = cLISTOPo->op_first->op_sibling;
3411
3412 for (; o; o = o->op_next) {
54310121 3413 OPCODE type = o->op_type;
fe5e78ed
GS		 3414
3415 if(sv && o->op_next == o)
3416 return sv;
54310121 3417 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
3418 continue;
3419 if (type == OP_LEAVESUB || type == OP_RETURN)
3420 break;
3421 if (sv)
3422 return Nullsv;
3423 if (type == OP_CONST)
5dc0d613 3424 sv = cSVOPo->op_sv;
fe5e78ed 3425 else if (type == OP_PADSV && cv) {
e858de61
MB		 3426 AV* padav = (AV*)(AvARRAY(CvPADLIST(cv))[1]);
3427 sv = padav ? AvARRAY(padav)[o->op_targ] : Nullsv;
5aabfad6 3428 if (!sv || (!SvREADONLY(sv) && SvREFCNT(sv) > 1))
54310121 3429 return Nullsv;
760ac839 3430 }
54310121 3431 else
3432 return Nullsv;
760ac839 3433 }
5aabfad6 3434 if (sv)
3435 SvREADONLY_on(sv);
760ac839
LW		 3436 return sv;
3437}
3438
748a9306 3439CV *
8ac85365 3440newSUB(I32 floor, OP *o, OP *proto, OP *block)
79072805 3441{
11343788 3442 dTHR;
5dc0d613 3443 char *name = o ? SvPVx(cSVOPo->op_sv, na) : Nullch;
55d729e4
GS		 3444 GV *gv = gv_fetchpv(name ? name : "__ANON__",
3445 GV_ADDMULTI | (block ? 0 : GV_NOINIT), SVt_PVCV);
3fe9a6f1 3446 char *ps = proto ? SvPVx(((SVOP*)proto)->op_sv, na) : Nullch;
a2008d6d 3447 register CV *cv=0;
a0d0e21e 3448 I32 ix;
79072805 3449
11343788 3450 if (o)
5dc0d613 3451 SAVEFREEOP(o);
3fe9a6f1 3452 if (proto)
3453 SAVEFREEOP(proto);
3454
55d729e4
GS		 3455 if (SvTYPE(gv) != SVt_PVGV) { /* Prototype now, and had
3456 maximum a prototype before. */
3457 if (SvTYPE(gv) > SVt_NULL) {
3458 if (!SvPOK((SV*)gv) && !(SvIOK((SV*)gv) && SvIVX((SV*)gv) == -1))
3459 warn("Runaway prototype");
3460 cv_ckproto((CV*)gv, NULL, ps);
3461 }
3462 if (ps)
3463 sv_setpv((SV*)gv, ps);
3464 else
3465 sv_setiv((SV*)gv, -1);
3466 SvREFCNT_dec(compcv);
57ff9a15 3467 cv = compcv = NULL;
55d729e4
GS		 3468 sub_generation++;
3469 goto noblock;
3470 }
3471
68dc0745 3472 if (!name || GvCVGEN(gv))
3473 cv = Nullcv;
3474 else if (cv = GvCV(gv)) {
3fe9a6f1 3475 cv_ckproto(cv, gv, ps);
68dc0745 3476 /* already defined (or promised)? */
3477 if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
3478 SV* const_sv;
fe5e78ed 3479 bool const_changed = TRUE;
aa689395 3480 if (!block) {
3481 /* just a "sub foo;" when &foo is already defined */
3482 SAVEFREESV(compcv);
3483 goto done;
3484 }
7bac28a0 3485 /* ahem, death to those who redefine active sort subs */
e788e7d3 3486 if (curstackinfo->si_type == PERLSI_SORT && sortcop == CvSTART(cv))
7bac28a0 3487 croak("Can't redefine active sort subroutine %s", name);
fe5e78ed
GS		 3488 if(const_sv = cv_const_sv(cv))
3489 const_changed = sv_cmp(const_sv, op_const_sv(block, Nullcv));
3490 if ((const_sv && const_changed) || dowarn && !(CvGV(cv) && GvSTASH(CvGV(cv))
2f34f9d4
IZ		 3491 && HvNAME(GvSTASH(CvGV(cv)))
3492 && strEQ(HvNAME(GvSTASH(CvGV(cv))),
3493 "autouse"))) {
79072805 3494 line_t oldline = curcop->cop_line;
79072805 3495 curcop->cop_line = copline;
760ac839 3496 warn(const_sv ? "Constant subroutine %s redefined"
68dc0745 3497 : "Subroutine %s redefined", name);
79072805
LW		 3498 curcop->cop_line = oldline;
3499 }
8990e307 3500 SvREFCNT_dec(cv);
68dc0745 3501 cv = Nullcv;
79072805
LW		 3502 }
3503 }
a0d0e21e 3504 if (cv) { /* must reuse cv if autoloaded */
4633a7c4 3505 cv_undef(cv);
44a8e56a 3506 CvFLAGS(cv) = CvFLAGS(compcv);
748a9306 3507 CvOUTSIDE(cv) = CvOUTSIDE(compcv);
e9a444f0 3508 CvOUTSIDE(compcv) = 0;
748a9306 3509 CvPADLIST(cv) = CvPADLIST(compcv);
4aa0a1f7 3510 CvPADLIST(compcv) = 0;
4633a7c4
LW		 3511 if (SvREFCNT(compcv) > 1) /* XXX Make closures transit through stub. */
3512 CvOUTSIDE(compcv) = (CV*)SvREFCNT_inc((SV*)cv);
748a9306 3513 SvREFCNT_dec(compcv);
a0d0e21e
LW		 3514 }
3515 else {
748a9306 3516 cv = compcv;
44a8e56a 3517 if (name) {
3518 GvCV(gv) = cv;
3519 GvCVGEN(gv) = 0;
3520 sub_generation++;
3521 }
a0d0e21e 3522 }
44a8e56a 3523 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
79072805 3524 CvFILEGV(cv) = curcop->cop_filegv;
8990e307 3525 CvSTASH(cv) = curstash;
11343788
MB		 3526#ifdef USE_THREADS
3527 CvOWNER(cv) = 0;
12ca11f6 3528 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3529 MUTEX_INIT(CvMUTEXP(cv));
11343788 3530#endif /* USE_THREADS */
8990e307 3531
3fe9a6f1 3532 if (ps)
3533 sv_setpv((SV*)cv, ps);
4633a7c4 3534
c07a80fd 3535 if (error_count) {
3536 op_free(block);
3537 block = Nullop;
68dc0745 3538 if (name) {
3539 char *s = strrchr(name, ':');
3540 s = s ? s+1 : name;
6d4c2119
CS		 3541 if (strEQ(s, "BEGIN")) {
3542 char *not_safe =
3543 "BEGIN not safe after errors--compilation aborted";
3544 if (in_eval & 4)
3545 croak(not_safe);
3546 else {
3547 /* force display of errors found but not reported */
38a03e6e
MB		 3548 sv_catpv(ERRSV, not_safe);
3549 croak("%s", SvPVx(ERRSV, na));
6d4c2119
CS		 3550 }
3551 }
68dc0745 3552 }
c07a80fd 3553 }
a0d0e21e 3554 if (!block) {
55d729e4 3555 noblock:
a0d0e21e
LW		 3556 copline = NOLINE;
3557 LEAVE_SCOPE(floor);
3558 return cv;
3559 }
3560
93965878
NIS		 3561 if (AvFILLp(comppad_name) < AvFILLp(comppad))
3562 av_store(comppad_name, AvFILLp(comppad), Nullsv);
a0d0e21e 3563
54310121 3564 if (CvCLONE(cv)) {
3565 SV **namep = AvARRAY(comppad_name);
93965878 3566 for (ix = AvFILLp(comppad); ix > 0; ix--) {
54310121 3567 SV *namesv;
3568
3569 if (SvIMMORTAL(curpad[ix]))
3570 continue;
3571 /*
3572 * The only things that a clonable function needs in its
3573 * pad are references to outer lexicals and anonymous subs.
3574 * The rest are created anew during cloning.
3575 */
3576 if (!((namesv = namep[ix]) != Nullsv &&
3577 namesv != &sv_undef &&
3578 (SvFAKE(namesv) ||
3579 *SvPVX(namesv) == '&')))
3580 {
3581 SvREFCNT_dec(curpad[ix]);
3582 curpad[ix] = Nullsv;
3583 }
3584 }
a0d0e21e 3585 }
54310121 3586 else {
3587 AV *av = newAV(); /* Will be @_ */
3588 av_extend(av, 0);
3589 av_store(comppad, 0, (SV*)av);
3590 AvFLAGS(av) = AVf_REIFY;
79072805 3591
93965878 3592 for (ix = AvFILLp(comppad); ix > 0; ix--) {
54310121 3593 if (SvIMMORTAL(curpad[ix]))
3594 continue;
3595 if (!SvPADMY(curpad[ix]))
3596 SvPADTMP_on(curpad[ix]);
3597 }
3598 }
79072805 3599
a0d0e21e 3600 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
79072805
LW		 3601 CvSTART(cv) = LINKLIST(CvROOT(cv));
3602 CvROOT(cv)->op_next = 0;
3603 peep(CvSTART(cv));
93a17b20 3604
44a8e56a 3605 if (name) {
3606 char *s;
3607
84902520 3608 if (PERLDB_SUBLINE && curstash != debstash) {
46fc3d4c 3609 SV *sv = NEWSV(0,0);
44a8e56a 3610 SV *tmpstr = sv_newmortal();
549bb64a 3611 GV *db_postponed = gv_fetchpv("DB::postponed", GV_ADDMULTI, SVt_PVHV);
44a8e56a 3612 CV *cv;
3613 HV *hv;
3614
51790459
MB		 3615 sv_setpvf(sv, "%_:%ld-%ld",
3616 GvSV(curcop->cop_filegv),
3617 (long)subline, (long)curcop->cop_line);
44a8e56a 3618 gv_efullname3(tmpstr, gv, Nullch);
3619 hv_store(GvHV(DBsub), SvPVX(tmpstr), SvCUR(tmpstr), sv, 0);
44a8e56a 3620 hv = GvHVn(db_postponed);
9607fc9c 3621 if (HvFILL(hv) > 0 && hv_exists(hv, SvPVX(tmpstr), SvCUR(tmpstr))
3622 && (cv = GvCV(db_postponed))) {
44a8e56a 3623 dSP;
924508f0 3624 PUSHMARK(SP);
44a8e56a 3625 XPUSHs(tmpstr);
3626 PUTBACK;
3627 perl_call_sv((SV*)cv, G_DISCARD);
3628 }
3629 }
79072805 3630
44a8e56a 3631 if ((s = strrchr(name,':')))
28757baa 3632 s++;
3633 else
3634 s = name;
68dc0745 3635 if (strEQ(s, "BEGIN")) {
2ae324a7 3636 I32 oldscope = scopestack_ix;
28757baa 3637 ENTER;
3638 SAVESPTR(compiling.cop_filegv);
3639 SAVEI16(compiling.cop_line);
28757baa 3640 save_svref(&rs);
3641 sv_setsv(rs, nrs);
3642
3643 if (!beginav)
3644 beginav = newAV();
3645 DEBUG_x( dump_sub(gv) );
3646 av_push(beginav, (SV *)cv);
3647 GvCV(gv) = 0;
68dc0745 3648 call_list(oldscope, beginav);
a6006777 3649
28757baa 3650 curcop = &compiling;
3651 LEAVE;
3652 }
3653 else if (strEQ(s, "END") && !error_count) {
3654 if (!endav)
3655 endav = newAV();
3656 av_unshift(endav, 1);
3657 av_store(endav, 0, (SV *)cv);
3658 GvCV(gv) = 0;
3659 }
7d07dbc2
MB		 3660 else if (strEQ(s, "INIT") && !error_count) {
3661 if (!initav)
3662 initav = newAV();
3663 av_push(initav, SvREFCNT_inc(cv));
ae77835f 3664 }
79072805 3665 }
a6006777 3666
aa689395 3667 done:
79072805 3668 copline = NOLINE;
8990e307 3669 LEAVE_SCOPE(floor);
a0d0e21e 3670 return cv;
79072805
LW		 3671}
3672
5476c433
JD		 3673void
3674newCONSTSUB(HV *stash, char *name, SV *sv)
3675{
3676 dTHR;
3677 U32 oldhints = hints;
3678 HV *old_cop_stash = curcop->cop_stash;
3679 HV *old_curstash = curstash;
3680 line_t oldline = curcop->cop_line;
3681 curcop->cop_line = copline;
3682
3683 hints &= ~HINT_BLOCK_SCOPE;
3684 if(stash)
3685 curstash = curcop->cop_stash = stash;
3686
3687 newSUB(
be24f278 3688 start_subparse(FALSE, 0),
5476c433
JD		 3689 newSVOP(OP_CONST, 0, newSVpv(name,0)),
3690 newSVOP(OP_CONST, 0, &sv_no), /* SvPV(&sv_no) == "" -- GMB */
3691 newSTATEOP(0, Nullch, newSVOP(OP_CONST, 0, sv))
3692 );
3693
3694 hints = oldhints;
3695 curcop->cop_stash = old_cop_stash;
3696 curstash = old_curstash;
3697 curcop->cop_line = oldline;
3698}
3699
57d3b86d 3700CV *
e3b8966e 3701newXS(char *name, void (*subaddr) (CV * _CPERLproto), char *filename)
a0d0e21e 3702{
11343788 3703 dTHR;
44a8e56a 3704 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
79072805 3705 register CV *cv;
44a8e56a 3706
3707 if (cv = (name ? GvCV(gv) : Nullcv)) {
3708 if (GvCVGEN(gv)) {
3709 /* just a cached method */
3710 SvREFCNT_dec(cv);
3711 cv = 0;
3712 }
3713 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
3714 /* already defined (or promised) */
2f34f9d4
IZ		 3715 if (dowarn && !(CvGV(cv) && GvSTASH(CvGV(cv))
3716 && HvNAME(GvSTASH(CvGV(cv)))
3717 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "autouse"))) {
a0d0e21e 3718 line_t oldline = curcop->cop_line;
a0d0e21e
LW		 3719 curcop->cop_line = copline;
3720 warn("Subroutine %s redefined",name);
3721 curcop->cop_line = oldline;
3722 }
3723 SvREFCNT_dec(cv);
3724 cv = 0;
79072805 3725 }
79072805 3726 }
44a8e56a 3727
3728 if (cv) /* must reuse cv if autoloaded */
3729 cv_undef(cv);
a0d0e21e
LW		 3730 else {
3731 cv = (CV*)NEWSV(1105,0);
3732 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 3733 if (name) {
3734 GvCV(gv) = cv;
3735 GvCVGEN(gv) = 0;
3736 sub_generation++;
3737 }
a0d0e21e 3738 }
5196be3e 3739 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
11343788 3740#ifdef USE_THREADS
12ca11f6 3741 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3742 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 3743 CvOWNER(cv) = 0;
3744#endif /* USE_THREADS */
79072805 3745 CvFILEGV(cv) = gv_fetchfile(filename);
a0d0e21e 3746 CvXSUB(cv) = subaddr;
44a8e56a 3747
28757baa 3748 if (name) {
3749 char *s = strrchr(name,':');
3750 if (s)
3751 s++;
3752 else
3753 s = name;
3754 if (strEQ(s, "BEGIN")) {
3755 if (!beginav)
3756 beginav = newAV();
44a8e56a 3757 av_push(beginav, (SV *)cv);
3758 GvCV(gv) = 0;
28757baa 3759 }
3760 else if (strEQ(s, "END")) {
3761 if (!endav)
3762 endav = newAV();
3763 av_unshift(endav, 1);
44a8e56a 3764 av_store(endav, 0, (SV *)cv);
3765 GvCV(gv) = 0;
28757baa 3766 }
7d07dbc2
MB		 3767 else if (strEQ(s, "INIT")) {
3768 if (!initav)
3769 initav = newAV();
3770 av_push(initav, (SV *)cv);
ae77835f 3771 }
28757baa 3772 }
8990e307 3773 else
a5f75d66 3774 CvANON_on(cv);
44a8e56a 3775
a0d0e21e 3776 return cv;
79072805
LW		 3777}
3778
3779void
8ac85365 3780newFORM(I32 floor, OP *o, OP *block)
79072805 3781{
11343788 3782 dTHR;
79072805
LW		 3783 register CV *cv;
3784 char *name;
3785 GV *gv;
a0d0e21e 3786 I32 ix;
79072805 3787
11343788
MB		 3788 if (o)
3789 name = SvPVx(cSVOPo->op_sv, na);
79072805
LW		 3790 else
3791 name = "STDOUT";
85e6fe83 3792 gv = gv_fetchpv(name,TRUE, SVt_PVFM);
a5f75d66 3793 GvMULTI_on(gv);
79072805
LW		 3794 if (cv = GvFORM(gv)) {
3795 if (dowarn) {
3796 line_t oldline = curcop->cop_line;
3797
3798 curcop->cop_line = copline;
3799 warn("Format %s redefined",name);
3800 curcop->cop_line = oldline;
3801 }
8990e307 3802 SvREFCNT_dec(cv);
79072805 3803 }
748a9306 3804 cv = compcv;
79072805 3805 GvFORM(gv) = cv;
44a8e56a 3806 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
79072805
LW		 3807 CvFILEGV(cv) = curcop->cop_filegv;
3808
93965878 3809 for (ix = AvFILLp(comppad); ix > 0; ix--) {
44a8e56a 3810 if (!SvPADMY(curpad[ix]) && !SvIMMORTAL(curpad[ix]))
a0d0e21e
LW		 3811 SvPADTMP_on(curpad[ix]);
3812 }
3813
79072805
LW		 3814 CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
3815 CvSTART(cv) = LINKLIST(CvROOT(cv));
3816 CvROOT(cv)->op_next = 0;
3817 peep(CvSTART(cv));
11343788 3818 op_free(o);
79072805 3819 copline = NOLINE;
8990e307 3820 LEAVE_SCOPE(floor);
79072805
LW		 3821}
3822
3823OP *
8ac85365 3824newANONLIST(OP *o)
79072805 3825{
93a17b20 3826 return newUNOP(OP_REFGEN, 0,
11343788 3827 mod(list(convert(OP_ANONLIST, 0, o)), OP_REFGEN));
79072805
LW		 3828}
3829
3830OP *
8ac85365 3831newANONHASH(OP *o)
79072805 3832{
93a17b20 3833 return newUNOP(OP_REFGEN, 0,
11343788 3834 mod(list(convert(OP_ANONHASH, 0, o)), OP_REFGEN));
a0d0e21e
LW		 3835}
3836
3837OP *
8ac85365 3838newANONSUB(I32 floor, OP *proto, OP *block)
a0d0e21e
LW		 3839{
3840 return newUNOP(OP_REFGEN, 0,
4633a7c4 3841 newSVOP(OP_ANONCODE, 0, (SV*)newSUB(floor, 0, proto, block)));
79072805
LW		 3842}
3843
3844OP *
8ac85365 3845oopsAV(OP *o)
79072805 3846{
ed6116ce
LW		 3847 switch (o->op_type) {
3848 case OP_PADSV:
3849 o->op_type = OP_PADAV;
3850 o->op_ppaddr = ppaddr[OP_PADAV];
3851 return ref(newUNOP(OP_RV2AV, 0, scalar(o)), OP_RV2AV);
3852
3853 case OP_RV2SV:
79072805
LW		 3854 o->op_type = OP_RV2AV;
3855 o->op_ppaddr = ppaddr[OP_RV2AV];
3856 ref(o, OP_RV2AV);
ed6116ce
LW		 3857 break;
3858
3859 default:
79072805 3860 warn("oops: oopsAV");
ed6116ce
LW		 3861 break;
3862 }
79072805
LW		 3863 return o;
3864}
3865
3866OP *
8ac85365 3867oopsHV(OP *o)
79072805 3868{
ed6116ce
LW		 3869 switch (o->op_type) {
3870 case OP_PADSV:
3871 case OP_PADAV:
3872 o->op_type = OP_PADHV;
3873 o->op_ppaddr = ppaddr[OP_PADHV];
3874 return ref(newUNOP(OP_RV2HV, 0, scalar(o)), OP_RV2HV);
3875
3876 case OP_RV2SV:
3877 case OP_RV2AV:
79072805
LW		 3878 o->op_type = OP_RV2HV;
3879 o->op_ppaddr = ppaddr[OP_RV2HV];
3880 ref(o, OP_RV2HV);
ed6116ce
LW		 3881 break;
3882
3883 default:
79072805 3884 warn("oops: oopsHV");
ed6116ce
LW		 3885 break;
3886 }
79072805
LW		 3887 return o;
3888}
3889
3890OP *
8ac85365 3891newAVREF(OP *o)
79072805 3892{
ed6116ce
LW		 3893 if (o->op_type == OP_PADANY) {
3894 o->op_type = OP_PADAV;
3895 o->op_ppaddr = ppaddr[OP_PADAV];
93a17b20 3896 return o;
ed6116ce 3897 }
79072805
LW		 3898 return newUNOP(OP_RV2AV, 0, scalar(o));
3899}
3900
3901OP *
8ac85365 3902newGVREF(I32 type, OP *o)
79072805 3903{
a0d0e21e
LW		 3904 if (type == OP_MAPSTART)
3905 return newUNOP(OP_NULL, 0, o);
748a9306 3906 return ref(newUNOP(OP_RV2GV, OPf_REF, o), type);
79072805
LW		 3907}
3908
3909OP *
8ac85365 3910newHVREF(OP *o)
79072805 3911{
ed6116ce
LW		 3912 if (o->op_type == OP_PADANY) {
3913 o->op_type = OP_PADHV;
3914 o->op_ppaddr = ppaddr[OP_PADHV];
93a17b20 3915 return o;
ed6116ce 3916 }
79072805
LW		 3917 return newUNOP(OP_RV2HV, 0, scalar(o));
3918}
3919
3920OP *
8ac85365 3921oopsCV(OP *o)
79072805 3922{
463ee0b2 3923 croak("NOT IMPL LINE %d",__LINE__);
79072805
LW		 3924 /* STUB */
3925 return o;
3926}
3927
3928OP *
8ac85365 3929newCVREF(I32 flags, OP *o)
79072805 3930{
c07a80fd 3931 return newUNOP(OP_RV2CV, flags, scalar(o));
79072805
LW		 3932}
3933
3934OP *
8ac85365 3935newSVREF(OP *o)
79072805 3936{
ed6116ce
LW		 3937 if (o->op_type == OP_PADANY) {
3938 o->op_type = OP_PADSV;
3939 o->op_ppaddr = ppaddr[OP_PADSV];
93a17b20 3940 return o;
ed6116ce 3941 }
224a4551
MB		 3942 else if (o->op_type == OP_THREADSV && !(o->op_flags & OPpDONE_SVREF)) {
3943 o->op_flags |= OPpDONE_SVREF;
a863c7d1 3944 return o;
224a4551 3945 }
79072805
LW		 3946 return newUNOP(OP_RV2SV, 0, scalar(o));
3947}
3948
3949/* Check routines. */
3950
3951OP *
8ac85365 3952ck_anoncode(OP *o)
5f05dabc 3953{
178c6305
CS		 3954 PADOFFSET ix;
3955 SV* name;
3956
3957 name = NEWSV(1106,0);
3958 sv_upgrade(name, SVt_PVNV);
3959 sv_setpvn(name, "&", 1);
3960 SvIVX(name) = -1;
3961 SvNVX(name) = 1;
5dc0d613 3962 ix = pad_alloc(o->op_type, SVs_PADMY);
178c6305 3963 av_store(comppad_name, ix, name);
5dc0d613
MB		 3964 av_store(comppad, ix, cSVOPo->op_sv);
3965 SvPADMY_on(cSVOPo->op_sv);
3966 cSVOPo->op_sv = Nullsv;
3967 cSVOPo->op_targ = ix;
3968 return o;
5f05dabc 3969}
3970
3971OP *
8ac85365 3972ck_bitop(OP *o)
55497cff 3973{
5dc0d613
MB		 3974 o->op_private = hints;
3975 return o;
55497cff 3976}
3977
3978OP *
8ac85365 3979ck_concat(OP *o)
79072805 3980{
11343788
MB		 3981 if (cUNOPo->op_first->op_type == OP_CONCAT)
3982 o->op_flags |= OPf_STACKED;
3983 return o;
79072805
LW		 3984}
3985
3986OP *
8ac85365 3987ck_spair(OP *o)
79072805 3988{
11343788 3989 if (o->op_flags & OPf_KIDS) {
79072805 3990 OP* newop;
a0d0e21e 3991 OP* kid;
5dc0d613
MB		 3992 OPCODE type = o->op_type;
3993 o = modkids(ck_fun(o), type);
11343788 3994 kid = cUNOPo->op_first;
a0d0e21e
LW		 3995 newop = kUNOP->op_first->op_sibling;
3996 if (newop &&
3997 (newop->op_sibling ||
3998 !(opargs[newop->op_type] & OA_RETSCALAR) ||
3999 newop->op_type == OP_PADAV || newop->op_type == OP_PADHV ||
4000 newop->op_type == OP_RV2AV || newop->op_type == OP_RV2HV)) {
aeea060c 4001
11343788 4002 return o;
a0d0e21e
LW		 4003 }
4004 op_free(kUNOP->op_first);
4005 kUNOP->op_first = newop;
4006 }
11343788
MB		 4007 o->op_ppaddr = ppaddr[++o->op_type];
4008 return ck_fun(o);
a0d0e21e
LW		 4009}
4010
4011OP *
8ac85365 4012ck_delete(OP *o)
a0d0e21e 4013{
11343788 4014 o = ck_fun(o);
5dc0d613 4015 o->op_private = 0;
11343788
MB		 4016 if (o->op_flags & OPf_KIDS) {
4017 OP *kid = cUNOPo->op_first;
5f05dabc 4018 if (kid->op_type == OP_HSLICE)
5dc0d613 4019 o->op_private |= OPpSLICE;
5f05dabc 4020 else if (kid->op_type != OP_HELEM)
4021 croak("%s argument is not a HASH element or slice",
5dc0d613 4022 op_desc[o->op_type]);
a0d0e21e 4023 null(kid);
79072805 4024 }
11343788 4025 return o;
79072805
LW		 4026}
4027
4028OP *
8ac85365 4029ck_eof(OP *o)
79072805 4030{
11343788 4031 I32 type = o->op_type;
79072805 4032
11343788
MB		 4033 if (o->op_flags & OPf_KIDS) {
4034 if (cLISTOPo->op_first->op_type == OP_STUB) {
4035 op_free(o);
4036 o = newUNOP(type, OPf_SPECIAL,
d58bf5aa 4037 newGVOP(OP_GV, 0, gv_fetchpv("main::ARGV", TRUE, SVt_PVAV)));
8990e307 4038 }
11343788 4039 return ck_fun(o);
79072805 4040 }
11343788 4041 return o;
79072805
LW		 4042}
4043
4044OP *
8ac85365 4045ck_eval(OP *o)
79072805 4046{
85e6fe83 4047 hints |= HINT_BLOCK_SCOPE;
11343788
MB		 4048 if (o->op_flags & OPf_KIDS) {
4049 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 4050
93a17b20 4051 if (!kid) {
11343788
MB		 4052 o->op_flags &= ~OPf_KIDS;
4053 null(o);
79072805
LW		 4054 }
4055 else if (kid->op_type == OP_LINESEQ) {
4056 LOGOP *enter;
4057
11343788
MB		 4058 kid->op_next = o->op_next;
4059 cUNOPo->op_first = 0;
4060 op_free(o);
79072805
LW		 4061
4062 Newz(1101, enter, 1, LOGOP);
4063 enter->op_type = OP_ENTERTRY;
4064 enter->op_ppaddr = ppaddr[OP_ENTERTRY];
4065 enter->op_private = 0;
4066
4067 /* establish postfix order */
4068 enter->op_next = (OP*)enter;
4069
11343788
MB		 4070 o = prepend_elem(OP_LINESEQ, (OP*)enter, (OP*)kid);
4071 o->op_type = OP_LEAVETRY;
4072 o->op_ppaddr = ppaddr[OP_LEAVETRY];
4073 enter->op_other = o;
4074 return o;
79072805 4075 }
c7cc6f1c 4076 else
473986ff 4077 scalar((OP*)kid);
79072805
LW		 4078 }
4079 else {
11343788 4080 op_free(o);
54b9620d 4081 o = newUNOP(OP_ENTEREVAL, 0, newDEFSVOP());
79072805 4082 }
11343788
MB		 4083 o->op_targ = (PADOFFSET)hints;
4084 return o;
79072805
LW		 4085}
4086
4087OP *
8ac85365 4088ck_exec(OP *o)
79072805
LW		 4089{
4090 OP *kid;
11343788
MB		 4091 if (o->op_flags & OPf_STACKED) {
4092 o = ck_fun(o);
4093 kid = cUNOPo->op_first->op_sibling;
8990e307
LW		 4094 if (kid->op_type == OP_RV2GV)
4095 null(kid);
79072805 4096 }
463ee0b2 4097 else
11343788
MB		 4098 o = listkids(o);
4099 return o;
79072805
LW		 4100}
4101
4102OP *
8ac85365 4103ck_exists(OP *o)
5f05dabc 4104{
5196be3e
MB		 4105 o = ck_fun(o);
4106 if (o->op_flags & OPf_KIDS) {
4107 OP *kid = cUNOPo->op_first;
5f05dabc 4108 if (kid->op_type != OP_HELEM)
5196be3e 4109 croak("%s argument is not a HASH element", op_desc[o->op_type]);
5f05dabc 4110 null(kid);
4111 }
5196be3e 4112 return o;
5f05dabc 4113}
4114
4115OP *
8ac85365 4116ck_gvconst(register OP *o)
79072805
LW		 4117{
4118 o = fold_constants(o);
4119 if (o->op_type == OP_CONST)
4120 o->op_type = OP_GV;
4121 return o;
4122}
4123
4124OP *
8ac85365 4125ck_rvconst(register OP *o)
79072805 4126{
11343788
MB		 4127 dTHR;
4128 SVOP *kid = (SVOP*)cUNOPo->op_first;
85e6fe83 4129
11343788 4130 o->op_private |= (hints & HINT_STRICT_REFS);
79072805 4131 if (kid->op_type == OP_CONST) {
44a8e56a 4132 char *name;
4133 int iscv;
4134 GV *gv;
4135
4136 name = SvPV(kid->op_sv, na);
4137 if ((hints & HINT_STRICT_REFS) && (kid->op_private & OPpCONST_BARE)) {
4138 char *badthing = Nullch;
5dc0d613 4139 switch (o->op_type) {
44a8e56a 4140 case OP_RV2SV:
4141 badthing = "a SCALAR";
4142 break;
4143 case OP_RV2AV:
4144 badthing = "an ARRAY";
4145 break;
4146 case OP_RV2HV:
4147 badthing = "a HASH";
4148 break;
4149 }
4150 if (badthing)
4151 croak(
4152 "Can't use bareword (\"%s\") as %s ref while \"strict refs\" in use",
4153 name, badthing);
4154 }
93233ece
CS		 4155 /*
4156 * This is a little tricky. We only want to add the symbol if we
4157 * didn't add it in the lexer. Otherwise we get duplicate strict
4158 * warnings. But if we didn't add it in the lexer, we must at
4159 * least pretend like we wanted to add it even if it existed before,
4160 * or we get possible typo warnings. OPpCONST_ENTERED says
4161 * whether the lexer already added THIS instance of this symbol.
4162 */
5196be3e 4163 iscv = (o->op_type == OP_RV2CV) * 2;
93233ece 4164 do {
44a8e56a 4165 gv = gv_fetchpv(name,
748a9306 4166 iscv | !(kid->op_private & OPpCONST_ENTERED),
a0d0e21e
LW		 4167 iscv
4168 ? SVt_PVCV
11343788 4169 : o->op_type == OP_RV2SV
a0d0e21e 4170 ? SVt_PV
11343788 4171 : o->op_type == OP_RV2AV
a0d0e21e 4172 ? SVt_PVAV
11343788 4173 : o->op_type == OP_RV2HV
a0d0e21e
LW		 4174 ? SVt_PVHV
4175 : SVt_PVGV);
93233ece
CS		 4176 } while (!gv && !(kid->op_private & OPpCONST_ENTERED) && !iscv++);
4177 if (gv) {
4178 kid->op_type = OP_GV;
4179 SvREFCNT_dec(kid->op_sv);
4180 kid->op_sv = SvREFCNT_inc(gv);
a0d0e21e 4181 }
79072805 4182 }
11343788 4183 return o;
79072805
LW		 4184}
4185
4186OP *
8ac85365 4187ck_ftst(OP *o)
79072805 4188{
11343788
MB		 4189 dTHR;
4190 I32 type = o->op_type;
79072805 4191
11343788
MB		 4192 if (o->op_flags & OPf_REF)
4193 return o;
79072805 4194
108ed793 4195 if (o->op_flags & OPf_KIDS && cUNOPo->op_first->op_type != OP_STUB) {
11343788 4196 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805
LW		 4197
4198 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
a0d0e21e 4199 OP *newop = newGVOP(type, OPf_REF,
85e6fe83 4200 gv_fetchpv(SvPVx(kid->op_sv, na), TRUE, SVt_PVIO));
11343788 4201 op_free(o);
79072805
LW		 4202 return newop;
4203 }
4204 }
4205 else {
11343788 4206 op_free(o);
79072805 4207 if (type == OP_FTTTY)
fb73857a 4208 return newGVOP(type, OPf_REF, gv_fetchpv("main::STDIN", TRUE,
85e6fe83 4209 SVt_PVIO));
79072805 4210 else
54b9620d 4211 return newUNOP(type, 0, newDEFSVOP());
79072805 4212 }
11343788 4213 return o;
79072805
LW		 4214}
4215
4216OP *
8ac85365 4217ck_fun(OP *o)
79072805 4218{
11343788 4219 dTHR;
79072805
LW		 4220 register OP *kid;
4221 OP **tokid;
4222 OP *sibl;
4223 I32 numargs = 0;
11343788 4224 int type = o->op_type;
a0d0e21e 4225 register I32 oa = opargs[type] >> OASHIFT;
aeea060c 4226
11343788 4227 if (o->op_flags & OPf_STACKED) {
79072805
LW		 4228 if ((oa & OA_OPTIONAL) && (oa >> 4) && !((oa >> 4) & OA_OPTIONAL))
4229 oa &= ~OA_OPTIONAL;
4230 else
11343788 4231 return no_fh_allowed(o);
79072805
LW		 4232 }
4233
11343788
MB		 4234 if (o->op_flags & OPf_KIDS) {
4235 tokid = &cLISTOPo->op_first;
4236 kid = cLISTOPo->op_first;
8990e307
LW		 4237 if (kid->op_type == OP_PUSHMARK ||
4238 kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK)
4239 {
79072805
LW		 4240 tokid = &kid->op_sibling;
4241 kid = kid->op_sibling;
4242 }
a0d0e21e 4243 if (!kid && opargs[type] & OA_DEFGV)
54b9620d 4244 *tokid = kid = newDEFSVOP();
79072805
LW		 4245
4246 while (oa && kid) {
4247 numargs++;
4248 sibl = kid->op_sibling;
4249 switch (oa & 7) {
4250 case OA_SCALAR:
4251 scalar(kid);
4252 break;
4253 case OA_LIST:
4254 if (oa < 16) {
4255 kid = 0;
4256 continue;
4257 }
4258 else
4259 list(kid);
4260 break;
4261 case OA_AVREF:
4262 if (kid->op_type == OP_CONST &&
4263 (kid->op_private & OPpCONST_BARE)) {
463ee0b2 4264 char *name = SvPVx(((SVOP*)kid)->op_sv, na);
79072805 4265 OP *newop = newAVREF(newGVOP(OP_GV, 0,
85e6fe83 4266 gv_fetchpv(name, TRUE, SVt_PVAV) ));
463ee0b2 4267 if (dowarn)
ff0cee69 4268 warn("Array @%s missing the @ in argument %ld of %s()",
4269 name, (long)numargs, op_desc[type]);
79072805
LW		 4270 op_free(kid);
4271 kid = newop;
4272 kid->op_sibling = sibl;
4273 *tokid = kid;
4274 }
8990e307 4275 else if (kid->op_type != OP_RV2AV && kid->op_type != OP_PADAV)
11343788 4276 bad_type(numargs, "array", op_desc[o->op_type], kid);
a0d0e21e 4277 mod(kid, type);
79072805
LW		 4278 break;
4279 case OA_HVREF:
4280 if (kid->op_type == OP_CONST &&
4281 (kid->op_private & OPpCONST_BARE)) {
463ee0b2 4282 char *name = SvPVx(((SVOP*)kid)->op_sv, na);
79072805 4283 OP *newop = newHVREF(newGVOP(OP_GV, 0,
85e6fe83 4284 gv_fetchpv(name, TRUE, SVt_PVHV) ));
463ee0b2 4285 if (dowarn)
ff0cee69 4286 warn("Hash %%%s missing the %% in argument %ld of %s()",
4287 name, (long)numargs, op_desc[type]);
79072805
LW		 4288 op_free(kid);
4289 kid = newop;
4290 kid->op_sibling = sibl;
4291 *tokid = kid;
4292 }
8990e307 4293 else if (kid->op_type != OP_RV2HV && kid->op_type != OP_PADHV)
11343788 4294 bad_type(numargs, "hash", op_desc[o->op_type], kid);
a0d0e21e 4295 mod(kid, type);
79072805
LW		 4296 break;
4297 case OA_CVREF:
4298 {
a0d0e21e 4299 OP *newop = newUNOP(OP_NULL, 0, kid);
79072805
LW		 4300 kid->op_sibling = 0;
4301 linklist(kid);
4302 newop->op_next = newop;
4303 kid = newop;
4304 kid->op_sibling = sibl;
4305 *tokid = kid;
4306 }
4307 break;
4308 case OA_FILEREF:
4309 if (kid->op_type != OP_GV) {
4310 if (kid->op_type == OP_CONST &&
4311 (kid->op_private & OPpCONST_BARE)) {
4312 OP *newop = newGVOP(OP_GV, 0,
85e6fe83
LW		 4313 gv_fetchpv(SvPVx(((SVOP*)kid)->op_sv, na), TRUE,
4314 SVt_PVIO) );
79072805
LW		 4315 op_free(kid);
4316 kid = newop;
4317 }
4318 else {
4319 kid->op_sibling = 0;
4320 kid = newUNOP(OP_RV2GV, 0, scalar(kid));
4321 }
4322 kid->op_sibling = sibl;
4323 *tokid = kid;
4324 }
4325 scalar(kid);
4326 break;
4327 case OA_SCALARREF:
a0d0e21e 4328 mod(scalar(kid), type);
79072805
LW		 4329 break;
4330 }
4331 oa >>= 4;
4332 tokid = &kid->op_sibling;
4333 kid = kid->op_sibling;
4334 }
11343788 4335 o->op_private |= numargs;
79072805 4336 if (kid)
11343788
MB		 4337 return too_many_arguments(o,op_desc[o->op_type]);
4338 listkids(o);
79072805 4339 }
a0d0e21e 4340 else if (opargs[type] & OA_DEFGV) {
11343788 4341 op_free(o);
54b9620d 4342 return newUNOP(type, 0, newDEFSVOP());
a0d0e21e
LW		 4343 }
4344
79072805
LW		 4345 if (oa) {
4346 while (oa & OA_OPTIONAL)
4347 oa >>= 4;
4348 if (oa && oa != OA_LIST)
11343788 4349 return too_few_arguments(o,op_desc[o->op_type]);
79072805 4350 }
11343788 4351 return o;
79072805
LW		 4352}
4353
4354OP *
8ac85365 4355ck_glob(OP *o)
79072805 4356{
fb73857a 4357 GV *gv;
4358
1f2bfc8a 4359 if ((o->op_flags & OPf_KIDS) && !cLISTOPo->op_first->op_sibling)
54b9620d 4360 append_elem(OP_GLOB, o, newDEFSVOP());
fb73857a 4361
4362 if (!((gv = gv_fetchpv("glob", FALSE, SVt_PVCV)) && GvIMPORTED_CV(gv)))
4363 gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
b1cb66bf 4364
4365 if (gv && GvIMPORTED_CV(gv)) {
46fc3d4c 4366 static int glob_index;
4367
5196be3e 4368 append_elem(OP_GLOB, o,
46fc3d4c 4369 newSVOP(OP_CONST, 0, newSViv(glob_index++)));
1f2bfc8a
MB		 4370 o->op_type = OP_LIST;
4371 o->op_ppaddr = ppaddr[OP_LIST];
4372 cLISTOPo->op_first->op_type = OP_PUSHMARK;
4373 cLISTOPo->op_first->op_ppaddr = ppaddr[OP_PUSHMARK];
4374 o = newUNOP(OP_ENTERSUB, OPf_STACKED,
aeea060c 4375 append_elem(OP_LIST, o,
1f2bfc8a
MB		 4376 scalar(newUNOP(OP_RV2CV, 0,
4377 newGVOP(OP_GV, 0, gv)))));
d58bf5aa
MB		 4378 o = newUNOP(OP_NULL, 0, ck_subr(o));
4379 o->op_targ = OP_GLOB; /* hint at what it used to be */
4380 return o;
b1cb66bf 4381 }
4382 gv = newGVgen("main");
a0d0e21e 4383 gv_IOadd(gv);
11343788
MB		 4384 append_elem(OP_GLOB, o, newGVOP(OP_GV, 0, gv));
4385 scalarkids(o);
4386 return ck_fun(o);
79072805
LW		 4387}
4388
4389OP *
8ac85365 4390ck_grep(OP *o)
79072805
LW		 4391{
4392 LOGOP *gwop;
4393 OP *kid;
11343788 4394 OPCODE type = o->op_type == OP_GREPSTART ? OP_GREPWHILE : OP_MAPWHILE;
79072805 4395
11343788 4396 o->op_ppaddr = ppaddr[OP_GREPSTART];
a0d0e21e 4397 Newz(1101, gwop, 1, LOGOP);
aeea060c 4398
11343788 4399 if (o->op_flags & OPf_STACKED) {
a0d0e21e 4400 OP* k;
11343788
MB		 4401 o = ck_sort(o);
4402 kid = cLISTOPo->op_first->op_sibling;
4403 for (k = cLISTOPo->op_first->op_sibling->op_next; k; k = k->op_next) {
a0d0e21e
LW		 4404 kid = k;
4405 }
4406 kid->op_next = (OP*)gwop;
11343788 4407 o->op_flags &= ~OPf_STACKED;
93a17b20 4408 }
11343788 4409 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e
LW		 4410 if (type == OP_MAPWHILE)
4411 list(kid);
4412 else
4413 scalar(kid);
11343788 4414 o = ck_fun(o);
79072805 4415 if (error_count)
11343788 4416 return o;
aeea060c 4417 kid = cLISTOPo->op_first->op_sibling;
79072805 4418 if (kid->op_type != OP_NULL)
463ee0b2 4419 croak("panic: ck_grep");
79072805
LW		 4420 kid = kUNOP->op_first;
4421
a0d0e21e
LW		 4422 gwop->op_type = type;
4423 gwop->op_ppaddr = ppaddr[type];
11343788 4424 gwop->op_first = listkids(o);
79072805
LW		 4425 gwop->op_flags |= OPf_KIDS;
4426 gwop->op_private = 1;
4427 gwop->op_other = LINKLIST(kid);
a0d0e21e 4428 gwop->op_targ = pad_alloc(type, SVs_PADTMP);
79072805
LW		 4429 kid->op_next = (OP*)gwop;
4430
11343788 4431 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e 4432 if (!kid || !kid->op_sibling)
11343788 4433 return too_few_arguments(o,op_desc[o->op_type]);
a0d0e21e
LW		 4434 for (kid = kid->op_sibling; kid; kid = kid->op_sibling)
4435 mod(kid, OP_GREPSTART);
4436
79072805
LW		 4437 return (OP*)gwop;
4438}
4439
4440OP *
8ac85365 4441ck_index(OP *o)
79072805 4442{
11343788
MB		 4443 if (o->op_flags & OPf_KIDS) {
4444 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
79072805 4445 if (kid && kid->op_type == OP_CONST)
2779dcf1 4446 fbm_compile(((SVOP*)kid)->op_sv, 0);
79072805 4447 }
11343788 4448 return ck_fun(o);
79072805
LW		 4449}
4450
4451OP *
8ac85365 4452ck_lengthconst(OP *o)
79072805
LW		 4453{
4454 /* XXX length optimization goes here */
11343788 4455 return ck_fun(o);
79072805
LW		 4456}
4457
4458OP *
8ac85365 4459ck_lfun(OP *o)
79072805 4460{
5dc0d613
MB		 4461 OPCODE type = o->op_type;
4462 return modkids(ck_fun(o), type);
79072805
LW		 4463}
4464
4465OP *
8ac85365 4466ck_rfun(OP *o)
8990e307 4467{
5dc0d613
MB		 4468 OPCODE type = o->op_type;
4469 return refkids(ck_fun(o), type);
8990e307
LW		 4470}
4471
4472OP *
8ac85365 4473ck_listiob(OP *o)
79072805
LW		 4474{
4475 register OP *kid;
aeea060c 4476
11343788 4477 kid = cLISTOPo->op_first;
79072805 4478 if (!kid) {
11343788
MB		 4479 o = force_list(o);
4480 kid = cLISTOPo->op_first;
79072805
LW		 4481 }
4482 if (kid->op_type == OP_PUSHMARK)
4483 kid = kid->op_sibling;
11343788 4484 if (kid && o->op_flags & OPf_STACKED)
79072805
LW		 4485 kid = kid->op_sibling;
4486 else if (kid && !kid->op_sibling) { /* print HANDLE; */
4487 if (kid->op_type == OP_CONST && kid->op_private & OPpCONST_BARE) {
11343788 4488 o->op_flags |= OPf_STACKED; /* make it a filehandle */
748a9306 4489 kid = newUNOP(OP_RV2GV, OPf_REF, scalar(kid));
11343788
MB		 4490 cLISTOPo->op_first->op_sibling = kid;
4491 cLISTOPo->op_last = kid;
79072805
LW		 4492 kid = kid->op_sibling;
4493 }
4494 }
4495
4496 if (!kid)
54b9620d 4497 append_elem(o->op_type, o, newDEFSVOP());
79072805 4498
5dc0d613 4499 o = listkids(o);
bbce6d69 4500
5dc0d613 4501 o->op_private = 0;
36477c24 4502#ifdef USE_LOCALE
bbce6d69 4503 if (hints & HINT_LOCALE)
5dc0d613 4504 o->op_private |= OPpLOCALE;
bbce6d69 4505#endif
4506
5dc0d613 4507 return o;
bbce6d69 4508}
4509
4510OP *
8ac85365 4511ck_fun_locale(OP *o)
bbce6d69 4512{
5dc0d613 4513 o = ck_fun(o);
bbce6d69 4514
5dc0d613 4515 o->op_private = 0;
36477c24 4516#ifdef USE_LOCALE
bbce6d69 4517 if (hints & HINT_LOCALE)
5dc0d613 4518 o->op_private |= OPpLOCALE;
bbce6d69 4519#endif
4520
5dc0d613 4521 return o;
bbce6d69 4522}
4523
4524OP *
8ac85365 4525ck_scmp(OP *o)
bbce6d69 4526{
5dc0d613 4527 o->op_private = 0;
36477c24 4528#ifdef USE_LOCALE
bbce6d69 4529 if (hints & HINT_LOCALE)
5dc0d613 4530 o->op_private |= OPpLOCALE;
bbce6d69 4531#endif
36477c24 4532
5dc0d613 4533 return o;
79072805
LW		 4534}
4535
4536OP *
8ac85365 4537ck_match(OP *o)
79072805 4538{
5dc0d613 4539 o->op_private |= OPpRUNTIME;
11343788 4540 return o;
79072805
LW		 4541}
4542
4543OP *
8ac85365 4544ck_null(OP *o)
79072805 4545{
11343788 4546 return o;
79072805
LW		 4547}
4548
4549OP *
8ac85365 4550ck_repeat(OP *o)
79072805 4551{
11343788
MB		 4552 if (cBINOPo->op_first->op_flags & OPf_PARENS) {
4553 o->op_private |= OPpREPEAT_DOLIST;
4554 cBINOPo->op_first = force_list(cBINOPo->op_first);
79072805
LW		 4555 }
4556 else
11343788
MB		 4557 scalar(o);
4558 return o;
79072805
LW		 4559}
4560
4561OP *
8ac85365 4562ck_require(OP *o)
8990e307 4563{
11343788
MB		 4564 if (o->op_flags & OPf_KIDS) { /* Shall we supply missing .pm? */
4565 SVOP *kid = (SVOP*)cUNOPo->op_first;
8990e307
LW		 4566
4567 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
8990e307 4568 char *s;
a0d0e21e
LW		 4569 for (s = SvPVX(kid->op_sv); *s; s++) {
4570 if (*s == ':' && s[1] == ':') {
4571 *s = '/';
1aef975c 4572 Move(s+2, s+1, strlen(s+2)+1, char);
a0d0e21e
LW		 4573 --SvCUR(kid->op_sv);
4574 }
8990e307 4575 }
a0d0e21e 4576 sv_catpvn(kid->op_sv, ".pm", 3);
8990e307
LW		 4577 }
4578 }
11343788 4579 return ck_fun(o);
8990e307
LW		 4580}
4581
4582OP *
8ac85365 4583ck_retarget(OP *o)
79072805 4584{
463ee0b2 4585 croak("NOT IMPL LINE %d",__LINE__);
79072805 4586 /* STUB */
11343788 4587 return o;
79072805
LW		 4588}
4589
4590OP *
8ac85365 4591ck_select(OP *o)
79072805 4592{
c07a80fd 4593 OP* kid;
11343788
MB		 4594 if (o->op_flags & OPf_KIDS) {
4595 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
2304df62 4596 if (kid && kid->op_sibling) {
11343788
MB		 4597 o->op_type = OP_SSELECT;
4598 o->op_ppaddr = ppaddr[OP_SSELECT];
4599 o = ck_fun(o);
4600 return fold_constants(o);
79072805
LW		 4601 }
4602 }
11343788
MB		 4603 o = ck_fun(o);
4604 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
c07a80fd 4605 if (kid && kid->op_type == OP_RV2GV)
4606 kid->op_private &= ~HINT_STRICT_REFS;
11343788 4607 return o;
79072805
LW		 4608}
4609
4610OP *
8ac85365 4611ck_shift(OP *o)
79072805 4612{
11343788 4613 I32 type = o->op_type;
79072805 4614
11343788 4615 if (!(o->op_flags & OPf_KIDS)) {
6d4ff0d2
MB		 4616 OP *argop;
4617
11343788 4618 op_free(o);
6d4ff0d2 4619#ifdef USE_THREADS
977336f5 4620 if (!CvUNIQUE(compcv)) {
6d4ff0d2
MB		 4621 argop = newOP(OP_PADAV, OPf_REF);
4622 argop->op_targ = 0; /* curpad[0] is @_ */
4623 }
4624 else {
4625 argop = newUNOP(OP_RV2AV, 0,
4626 scalar(newGVOP(OP_GV, 0,
4627 gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
4628 }
4629#else
4630 argop = newUNOP(OP_RV2AV, 0,
977336f5 4631 scalar(newGVOP(OP_GV, 0, !CvUNIQUE(compcv) ?
6d4ff0d2
MB		 4632 defgv : gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
4633#endif /* USE_THREADS */
4634 return newUNOP(type, 0, scalar(argop));
79072805 4635 }
11343788 4636 return scalar(modkids(ck_fun(o), type));
79072805
LW		 4637}
4638
4639OP *
8ac85365 4640ck_sort(OP *o)
79072805 4641{
5dc0d613 4642 o->op_private = 0;
36477c24 4643#ifdef USE_LOCALE
bbce6d69 4644 if (hints & HINT_LOCALE)
5dc0d613 4645 o->op_private |= OPpLOCALE;
bbce6d69 4646#endif
4647
11343788
MB		 4648 if (o->op_flags & OPf_STACKED) {
4649 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
463ee0b2
LW		 4650 OP *k;
4651 kid = kUNOP->op_first; /* get past rv2gv */
79072805 4652
463ee0b2 4653 if (kid->op_type == OP_SCOPE || kid->op_type == OP_LEAVE) {
79072805 4654 linklist(kid);
463ee0b2
LW		 4655 if (kid->op_type == OP_SCOPE) {
4656 k = kid->op_next;
4657 kid->op_next = 0;
79072805 4658 }
463ee0b2 4659 else if (kid->op_type == OP_LEAVE) {
11343788 4660 if (o->op_type == OP_SORT) {
748a9306
LW		 4661 null(kid); /* wipe out leave */
4662 kid->op_next = kid;
463ee0b2 4663
748a9306
LW		 4664 for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
4665 if (k->op_next == kid)
4666 k->op_next = 0;
4667 }
463ee0b2 4668 }
748a9306
LW		 4669 else
4670 kid->op_next = 0; /* just disconnect the leave */
a0d0e21e 4671 k = kLISTOP->op_first;
463ee0b2 4672 }
a0d0e21e
LW		 4673 peep(k);
4674
11343788 4675 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
8990e307 4676 null(kid); /* wipe out rv2gv */
11343788 4677 if (o->op_type == OP_SORT)
a0d0e21e
LW		 4678 kid->op_next = kid;
4679 else
4680 kid->op_next = k;
11343788 4681 o->op_flags |= OPf_SPECIAL;
79072805
LW		 4682 }
4683 }
bbce6d69 4684
11343788 4685 return o;
79072805
LW		 4686}
4687
4688OP *
8ac85365 4689ck_split(OP *o)
79072805
LW		 4690{
4691 register OP *kid;
aeea060c 4692
11343788
MB		 4693 if (o->op_flags & OPf_STACKED)
4694 return no_fh_allowed(o);
79072805 4695
11343788 4696 kid = cLISTOPo->op_first;
8990e307 4697 if (kid->op_type != OP_NULL)
463ee0b2 4698 croak("panic: ck_split");
8990e307 4699 kid = kid->op_sibling;
11343788
MB		 4700 op_free(cLISTOPo->op_first);
4701 cLISTOPo->op_first = kid;
85e6fe83 4702 if (!kid) {
11343788
MB		 4703 cLISTOPo->op_first = kid = newSVOP(OP_CONST, 0, newSVpv(" ", 1));
4704 cLISTOPo->op_last = kid; /* There was only one element previously */
85e6fe83 4705 }
79072805
LW		 4706
4707 if (kid->op_type != OP_MATCH) {
4708 OP *sibl = kid->op_sibling;
463ee0b2 4709 kid->op_sibling = 0;
79072805 4710 kid = pmruntime( newPMOP(OP_MATCH, OPf_SPECIAL), kid, Nullop);
11343788
MB		 4711 if (cLISTOPo->op_first == cLISTOPo->op_last)
4712 cLISTOPo->op_last = kid;
4713 cLISTOPo->op_first = kid;
79072805
LW		 4714 kid->op_sibling = sibl;
4715 }
4716
4717 kid->op_type = OP_PUSHRE;
4718 kid->op_ppaddr = ppaddr[OP_PUSHRE];
4719 scalar(kid);
4720
4721 if (!kid->op_sibling)
54b9620d 4722 append_elem(OP_SPLIT, o, newDEFSVOP());
79072805
LW		 4723
4724 kid = kid->op_sibling;
4725 scalar(kid);
4726
4727 if (!kid->op_sibling)
11343788 4728 append_elem(OP_SPLIT, o, newSVOP(OP_CONST, 0, newSViv(0)));
79072805
LW		 4729
4730 kid = kid->op_sibling;
4731 scalar(kid);
4732
4733 if (kid->op_sibling)
11343788 4734 return too_many_arguments(o,op_desc[o->op_type]);
79072805 4735
11343788 4736 return o;
79072805
LW		 4737}
4738
4739OP *
8ac85365 4740ck_subr(OP *o)
79072805 4741{
11343788
MB		 4742 dTHR;
4743 OP *prev = ((cUNOPo->op_first->op_sibling)
4744 ? cUNOPo : ((UNOP*)cUNOPo->op_first))->op_first;
4745 OP *o2 = prev->op_sibling;
4633a7c4
LW		 4746 OP *cvop;
4747 char *proto = 0;
4748 CV *cv = 0;
46fc3d4c 4749 GV *namegv = 0;
4633a7c4
LW		 4750 int optional = 0;
4751 I32 arg = 0;
4752
11343788 4753 for (cvop = o2; cvop->op_sibling; cvop = cvop->op_sibling) ;
4633a7c4
LW		 4754 if (cvop->op_type == OP_RV2CV) {
4755 SVOP* tmpop;
11343788 4756 o->op_private |= (cvop->op_private & OPpENTERSUB_AMPER);
4633a7c4
LW		 4757 null(cvop); /* disable rv2cv */
4758 tmpop = (SVOP*)((UNOP*)cvop)->op_first;
4759 if (tmpop->op_type == OP_GV) {
8ebc5c01 4760 cv = GvCVu(tmpop->op_sv);
5dc0d613 4761 if (cv && SvPOK(cv) && !(o->op_private & OPpENTERSUB_AMPER)) {
46fc3d4c 4762 namegv = CvANON(cv) ? (GV*)tmpop->op_sv : CvGV(cv);
4763 proto = SvPV((SV*)cv, na);
4764 }
4633a7c4
LW		 4765 }
4766 }
11343788 4767 o->op_private |= (hints & HINT_STRICT_REFS);
84902520 4768 if (PERLDB_SUB && curstash != debstash)
11343788
MB		 4769 o->op_private |= OPpENTERSUB_DB;
4770 while (o2 != cvop) {
4633a7c4
LW		 4771 if (proto) {
4772 switch (*proto) {
4773 case '\0':
5dc0d613 4774 return too_many_arguments(o, gv_ename(namegv));
4633a7c4
LW		 4775 case ';':
4776 optional = 1;
4777 proto++;
4778 continue;
4779 case '$':
4780 proto++;
4781 arg++;
11343788 4782 scalar(o2);
4633a7c4
LW		 4783 break;
4784 case '%':
4785 case '@':
11343788 4786 list(o2);
4633a7c4
LW		 4787 arg++;
4788 break;
4789 case '&':
4790 proto++;
4791 arg++;
11343788 4792 if (o2->op_type != OP_REFGEN && o2->op_type != OP_UNDEF)
5dc0d613 4793 bad_type(arg, "block", gv_ename(namegv), o2);
4633a7c4
LW		 4794 break;
4795 case '*':
4796 proto++;
4797 arg++;
11343788 4798 if (o2->op_type == OP_RV2GV)
4633a7c4
LW		 4799 goto wrapref;
4800 {
11343788 4801 OP* kid = o2;
69dcf70c 4802 OP* sib = kid->op_sibling;
4633a7c4 4803 kid->op_sibling = 0;
69dcf70c
MB		 4804 o2 = newUNOP(OP_RV2GV, 0, kid);
4805 o2->op_sibling = sib;
6fa846a0 4806 prev->op_sibling = o2;
4633a7c4
LW		 4807 }
4808 goto wrapref;
4809 case '\\':
4810 proto++;
4811 arg++;
4812 switch (*proto++) {
4813 case '*':
11343788 4814 if (o2->op_type != OP_RV2GV)
5dc0d613 4815 bad_type(arg, "symbol", gv_ename(namegv), o2);
4633a7c4
LW		 4816 goto wrapref;
4817 case '&':
11343788 4818 if (o2->op_type != OP_RV2CV)
5dc0d613 4819 bad_type(arg, "sub", gv_ename(namegv), o2);
4633a7c4
LW		 4820 goto wrapref;
4821 case '$':
11343788 4822 if (o2->op_type != OP_RV2SV && o2->op_type != OP_PADSV)
5dc0d613 4823 bad_type(arg, "scalar", gv_ename(namegv), o2);
4633a7c4
LW		 4824 goto wrapref;
4825 case '@':
11343788 4826 if (o2->op_type != OP_RV2AV && o2->op_type != OP_PADAV)
5dc0d613 4827 bad_type(arg, "array", gv_ename(namegv), o2);
4633a7c4
LW		 4828 goto wrapref;
4829 case '%':
11343788 4830 if (o2->op_type != OP_RV2HV && o2->op_type != OP_PADHV)
5dc0d613 4831 bad_type(arg, "hash", gv_ename(namegv), o2);
4633a7c4
LW		 4832 wrapref:
4833 {
11343788 4834 OP* kid = o2;
6fa846a0 4835 OP* sib = kid->op_sibling;
4633a7c4 4836 kid->op_sibling = 0;
6fa846a0
GS		 4837 o2 = newUNOP(OP_REFGEN, 0, kid);
4838 o2->op_sibling = sib;
e858de61 4839 prev->op_sibling = o2;
4633a7c4
LW		 4840 }
4841 break;
4842 default: goto oops;
4843 }
4844 break;
b1cb66bf 4845 case ' ':
4846 proto++;
4847 continue;
4633a7c4
LW		 4848 default:
4849 oops:
4850 croak("Malformed prototype for %s: %s",
46fc3d4c 4851 gv_ename(namegv), SvPV((SV*)cv, na));
4633a7c4
LW		 4852 }
4853 }
4854 else
11343788
MB		 4855 list(o2);
4856 mod(o2, OP_ENTERSUB);
4857 prev = o2;
4858 o2 = o2->op_sibling;
4633a7c4 4859 }
fb73857a 4860 if (proto && !optional &&
4861 (*proto && *proto != '@' && *proto != '%' && *proto != ';'))
5dc0d613 4862 return too_few_arguments(o, gv_ename(namegv));
11343788 4863 return o;
79072805
LW		 4864}
4865
4866OP *
8ac85365 4867ck_svconst(OP *o)
8990e307 4868{
11343788
MB		 4869 SvREADONLY_on(cSVOPo->op_sv);
4870 return o;
8990e307
LW		 4871}
4872
4873OP *
8ac85365 4874ck_trunc(OP *o)
79072805 4875{
11343788
MB		 4876 if (o->op_flags & OPf_KIDS) {
4877 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 4878
a0d0e21e
LW		 4879 if (kid->op_type == OP_NULL)
4880 kid = (SVOP*)kid->op_sibling;
4881 if (kid &&
4882 kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE))
11343788 4883 o->op_flags |= OPf_SPECIAL;
79072805 4884 }
11343788 4885 return ck_fun(o);
79072805
LW		 4886}
4887
463ee0b2
LW		 4888/* A peephole optimizer. We visit the ops in the order they're to execute. */
4889
79072805 4890void
8ac85365 4891peep(register OP *o)
79072805 4892{
11343788 4893 dTHR;
79072805 4894 register OP* oldop = 0;
a0d0e21e 4895 if (!o || o->op_seq)
79072805 4896 return;
a0d0e21e 4897 ENTER;
462e5cf6 4898 SAVEOP();
a0d0e21e
LW		 4899 SAVESPTR(curcop);
4900 for (; o; o = o->op_next) {
4901 if (o->op_seq)
4902 break;
c07a80fd 4903 if (!op_seqmax)
4904 op_seqmax++;
a0d0e21e
LW		 4905 op = o;
4906 switch (o->op_type) {
4907 case OP_NEXTSTATE:
4908 case OP_DBSTATE:
4909 curcop = ((COP*)o); /* for warnings */
c07a80fd 4910 o->op_seq = op_seqmax++;
a0d0e21e
LW		 4911 break;
4912
4913 case OP_CONCAT:
4914 case OP_CONST:
4915 case OP_JOIN:
4916 case OP_UC:
4917 case OP_UCFIRST:
4918 case OP_LC:
4919 case OP_LCFIRST:
4920 case OP_QUOTEMETA:
3c4f770c 4921 if (o->op_next && o->op_next->op_type == OP_STRINGIFY)
a0d0e21e 4922 null(o->op_next);
c07a80fd 4923 o->op_seq = op_seqmax++;
a0d0e21e 4924 break;
8990e307 4925 case OP_STUB:
54310121 4926 if ((o->op_flags & OPf_WANT) != OPf_WANT_LIST) {
c07a80fd 4927 o->op_seq = op_seqmax++;
54310121 4928 break; /* Scalar stub must produce undef. List stub is noop */
8990e307 4929 }
748a9306 4930 goto nothin;
79072805 4931 case OP_NULL:
748a9306 4932 if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
7766148a 4933 curcop = ((COP*)o);
748a9306 4934 goto nothin;
79072805 4935 case OP_SCALAR:
93a17b20 4936 case OP_LINESEQ:
463ee0b2 4937 case OP_SCOPE:
748a9306 4938 nothin:
a0d0e21e
LW		 4939 if (oldop && o->op_next) {
4940 oldop->op_next = o->op_next;
79072805
LW		 4941 continue;
4942 }
c07a80fd 4943 o->op_seq = op_seqmax++;
79072805
LW		 4944 break;
4945
4946 case OP_GV:
a0d0e21e 4947 if (o->op_next->op_type == OP_RV2SV) {
5f05dabc 4948 if (!(o->op_next->op_private & OPpDEREF)) {
a0d0e21e
LW		 4949 null(o->op_next);
4950 o->op_private |= o->op_next->op_private & OPpLVAL_INTRO;
4951 o->op_next = o->op_next->op_next;
4952 o->op_type = OP_GVSV;
4953 o->op_ppaddr = ppaddr[OP_GVSV];
8990e307
LW		 4954 }
4955 }
a0d0e21e
LW		 4956 else if (o->op_next->op_type == OP_RV2AV) {
4957 OP* pop = o->op_next->op_next;
4958 IV i;
8990e307 4959 if (pop->op_type == OP_CONST &&
e858de61 4960 (op = pop->op_next) &&
8990e307 4961 pop->op_next->op_type == OP_AELEM &&
a0d0e21e 4962 !(pop->op_next->op_private &
68dc0745 4963 (OPpLVAL_INTRO|OPpLVAL_DEFER|OPpDEREF)) &&
a0d0e21e
LW		 4964 (i = SvIV(((SVOP*)pop)->op_sv) - compiling.cop_arybase)
4965 <= 255 &&
8990e307
LW		 4966 i >= 0)
4967 {
748a9306 4968 SvREFCNT_dec(((SVOP*)pop)->op_sv);
a0d0e21e 4969 null(o->op_next);
8990e307
LW		 4970 null(pop->op_next);
4971 null(pop);
a0d0e21e
LW		 4972 o->op_flags |= pop->op_next->op_flags & OPf_MOD;
4973 o->op_next = pop->op_next->op_next;
4974 o->op_type = OP_AELEMFAST;
4975 o->op_ppaddr = ppaddr[OP_AELEMFAST];
4976 o->op_private = (U8)i;
a6006777 4977 GvAVn(((GVOP*)o)->op_gv);
8990e307 4978 }
79072805 4979 }
c07a80fd 4980 o->op_seq = op_seqmax++;
79072805
LW		 4981 break;
4982
af41f3ca
MB		 4983 case OP_PADAV:
4984 if (o->op_next->op_type == OP_RV2AV
49e9fbe6 4985 && (o->op_next->op_flags & OPf_REF))
af41f3ca
MB		 4986 {
4987 null(o->op_next);
4988 o->op_next = o->op_next->op_next;
4989 }
4990 break;
aeea060c 4991
af41f3ca
MB		 4992 case OP_PADHV:
4993 if (o->op_next->op_type == OP_RV2HV
49e9fbe6 4994 && (o->op_next->op_flags & OPf_REF))
af41f3ca
MB		 4995 {
4996 null(o->op_next);
4997 o->op_next = o->op_next->op_next;
4998 }
4999 break;
5000
a0d0e21e 5001 case OP_MAPWHILE:
79072805
LW		 5002 case OP_GREPWHILE:
5003 case OP_AND:
5004 case OP_OR:
c07a80fd 5005 o->op_seq = op_seqmax++;
fd4d1407
IZ		 5006 while (cLOGOP->op_other->op_type == OP_NULL)
5007 cLOGOP->op_other = cLOGOP->op_other->op_next;
79072805
LW		 5008 peep(cLOGOP->op_other);
5009 break;
5010
5011 case OP_COND_EXPR:
c07a80fd 5012 o->op_seq = op_seqmax++;
79072805
LW		 5013 peep(cCONDOP->op_true);
5014 peep(cCONDOP->op_false);
5015 break;
5016
5017 case OP_ENTERLOOP:
c07a80fd 5018 o->op_seq = op_seqmax++;
79072805
LW		 5019 peep(cLOOP->op_redoop);
5020 peep(cLOOP->op_nextop);
5021 peep(cLOOP->op_lastop);
5022 break;
5023
5024 case OP_MATCH:
5025 case OP_SUBST:
c07a80fd 5026 o->op_seq = op_seqmax++;
a0d0e21e 5027 peep(cPMOP->op_pmreplstart);
79072805
LW		 5028 break;
5029
a0d0e21e 5030 case OP_EXEC:
c07a80fd 5031 o->op_seq = op_seqmax++;
a0d0e21e
LW		 5032 if (dowarn && o->op_next && o->op_next->op_type == OP_NEXTSTATE) {
5033 if (o->op_next->op_sibling &&
20408e3c
GS		 5034 o->op_next->op_sibling->op_type != OP_EXIT &&
5035 o->op_next->op_sibling->op_type != OP_WARN &&
a0d0e21e
LW		 5036 o->op_next->op_sibling->op_type != OP_DIE) {
5037 line_t oldline = curcop->cop_line;
5038
5039 curcop->cop_line = ((COP*)o->op_next)->cop_line;
5040 warn("Statement unlikely to be reached");
5041 warn("(Maybe you meant system() when you said exec()?)\n");
5042 curcop->cop_line = oldline;
5043 }
5044 }
5045 break;
aeea060c 5046
c750a3ec
MB		 5047 case OP_HELEM: {
5048 UNOP *rop;
5049 SV *lexname;
5050 GV **fields;
5051 SV **svp, **indsvp;
5052 I32 ind;
5053 char *key;
5054 STRLEN keylen;
aeea060c 5055
c750a3ec
MB		 5056 if (o->op_private & (OPpDEREF_HV|OPpDEREF_AV|OPpLVAL_INTRO)
5057 || ((BINOP*)o)->op_last->op_type != OP_CONST)
5058 break;
5059 rop = (UNOP*)((BINOP*)o)->op_first;
5060 if (rop->op_type != OP_RV2HV || rop->op_first->op_type != OP_PADSV)
5061 break;
5062 lexname = *av_fetch(comppad_name, rop->op_first->op_targ, TRUE);
5063 if (!SvOBJECT(lexname))
5064 break;
5196be3e 5065 fields = (GV**)hv_fetch(SvSTASH(lexname), "FIELDS", 6, FALSE);
c750a3ec
MB		 5066 if (!fields || !GvHV(*fields))
5067 break;
5068 svp = &((SVOP*)((BINOP*)o)->op_last)->op_sv;
5069 key = SvPV(*svp, keylen);
5070 indsvp = hv_fetch(GvHV(*fields), key, keylen, FALSE);
5071 if (!indsvp) {
5072 croak("No such field \"%s\" in variable %s of type %s",
5073 key, SvPV(lexname, na), HvNAME(SvSTASH(lexname)));
5074 }
5075 ind = SvIV(*indsvp);
5076 if (ind < 1)
5077 croak("Bad index while coercing array into hash");
5078 rop->op_type = OP_RV2AV;
5079 rop->op_ppaddr = ppaddr[OP_RV2AV];
5080 o->op_type = OP_AELEM;
5081 o->op_ppaddr = ppaddr[OP_AELEM];
5082 SvREFCNT_dec(*svp);
5083 *svp = newSViv(ind);
5084 break;
5085 }
5086
79072805 5087 default:
c07a80fd 5088 o->op_seq = op_seqmax++;
79072805
LW		 5089 break;
5090 }
a0d0e21e 5091 oldop = o;
79072805 5092 }
a0d0e21e 5093 LEAVE;
79072805 5094}
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