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a0d0e21e 1/* op.c
79072805 2 *
4eb8286e 3 * Copyright (c) 1991-1999, 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"
864dbfa3 19#define PERL_IN_OP_C
79072805
LW		 20#include "perl.h"
21
76e3520e 22#ifdef PERL_OBJECT
22c35a8c 23#define CHECKCALL this->*PL_check
76e3520e 24#else
22c35a8c 25#define CHECKCALL *PL_check
b7dc083c
NIS		 26#endif
27
28/* #define PL_OP_SLAB_ALLOC */
29
30#ifdef PL_OP_SLAB_ALLOC
31#define SLAB_SIZE 8192
32static char *PL_OpPtr = NULL;
33static int PL_OpSpace = 0;
34#define NewOp(m,var,c,type) do { if ((PL_OpSpace -= c*sizeof(type)) >= 0) \
35 var = (type *)(PL_OpPtr -= c*sizeof(type)); \
36 else \
37 var = (type *) Slab_Alloc(m,c*sizeof(type)); \
38 } while (0)
39
864dbfa3 40STATIC void *
cea2e8a9 41S_Slab_Alloc(pTHX_ int m, size_t sz)
b7dc083c
NIS		 42{
43 Newz(m,PL_OpPtr,SLAB_SIZE,char);
44 PL_OpSpace = SLAB_SIZE - sz;
45 return PL_OpPtr += PL_OpSpace;
46}
76e3520e 47
b7dc083c
NIS		 48#else
49#define NewOp(m, var, c, type) Newz(m, var, c, type)
50#endif
e50aee73 51/*
5dc0d613 52 * In the following definition, the ", Nullop" is just to make the compiler
a5f75d66 53 * think the expression is of the right type: croak actually does a Siglongjmp.
e50aee73 54 */
11343788 55#define CHECKOP(type,o) \
3280af22 56 ((PL_op_mask && PL_op_mask[type]) \
5dc0d613 57 ? ( op_free((OP*)o), \
cea2e8a9 58 Perl_croak(aTHX_ "%s trapped by operation mask", PL_op_desc[type]), \
28757baa 59 Nullop ) \
cea2e8a9 60 : (CHECKCALL[type])(aTHX_ (OP*)o))
e50aee73 61
c53d7c7d
HS		 62#define PAD_MAX 999999999
63
76e3520e 64STATIC char*
cea2e8a9 65S_gv_ename(pTHX_ GV *gv)
4633a7c4 66{
2d8e6c8d 67 STRLEN n_a;
4633a7c4 68 SV* tmpsv = sv_newmortal();
46fc3d4c 69 gv_efullname3(tmpsv, gv, Nullch);
2d8e6c8d 70 return SvPV(tmpsv,n_a);
4633a7c4
LW		 71}
72
76e3520e 73STATIC OP *
cea2e8a9 74S_no_fh_allowed(pTHX_ OP *o)
79072805 75{
cea2e8a9 76 yyerror(Perl_form(aTHX_ "Missing comma after first argument to %s function",
22c35a8c 77 PL_op_desc[o->op_type]));
11343788 78 return o;
79072805
LW		 79}
80
76e3520e 81STATIC OP *
cea2e8a9 82S_too_few_arguments(pTHX_ OP *o, char *name)
79072805 83{
cea2e8a9 84 yyerror(Perl_form(aTHX_ "Not enough arguments for %s", name));
11343788 85 return o;
79072805
LW		 86}
87
76e3520e 88STATIC OP *
cea2e8a9 89S_too_many_arguments(pTHX_ OP *o, char *name)
79072805 90{
cea2e8a9 91 yyerror(Perl_form(aTHX_ "Too many arguments for %s", name));
11343788 92 return o;
79072805
LW		 93}
94
76e3520e 95STATIC void
cea2e8a9 96S_bad_type(pTHX_ I32 n, char *t, char *name, OP *kid)
8990e307 97{
cea2e8a9 98 yyerror(Perl_form(aTHX_ "Type of arg %d to %s must be %s (not %s)",
22c35a8c 99 (int)n, name, t, PL_op_desc[kid->op_type]));
8990e307
LW		 100}
101
7a52d87a 102STATIC void
cea2e8a9 103S_no_bareword_allowed(pTHX_ OP *o)
7a52d87a 104{
cea2e8a9 105 Perl_warn(aTHX_ "Bareword \"%s\" not allowed while \"strict subs\" in use",
7a52d87a
GS		 106 SvPV_nolen(cSVOPo->op_sv));
107 ++PL_error_count;
108}
109
a0d0e21e 110void
864dbfa3 111Perl_assertref(pTHX_ OP *o)
a0d0e21e 112{
11343788 113 int type = o->op_type;
136254bc 114 if (type != OP_AELEM && type != OP_HELEM && type != OP_GELEM) {
cea2e8a9 115 yyerror(Perl_form(aTHX_ "Can't use subscript on %s", PL_op_desc[type]));
bde90e66 116 if (type == OP_ENTERSUB || type == OP_RV2HV || type == OP_PADHV) {
9c82454c 117 dTHR;
bde90e66 118 SV *msg = sv_2mortal(
cea2e8a9 119 Perl_newSVpvf(aTHX_ "(Did you mean $ or @ instead of %c?)\n",
bde90e66 120 type == OP_ENTERSUB ? '&' : '%'));
faef0170 121 if (PL_in_eval & EVAL_WARNONLY)
cea2e8a9 122 Perl_warn(aTHX_ "%_", msg);
3280af22
NIS		 123 else if (PL_in_eval)
124 sv_catsv(GvSV(PL_errgv), msg);
bde90e66
HS		 125 else
126 PerlIO_write(PerlIO_stderr(), SvPVX(msg), SvCUR(msg));
127 }
a0d0e21e
LW		 128 }
129}
130
79072805
LW		 131/* "register" allocation */
132
133PADOFFSET
864dbfa3 134Perl_pad_allocmy(pTHX_ char *name)
93a17b20 135{
11343788 136 dTHR;
a0d0e21e
LW		 137 PADOFFSET off;
138 SV *sv;
139
834a4ddd
LW		 140 if (!(
141 isALPHA(name[1]) ||
142 (PL_hints & HINT_UTF8 && (name[1] & 0xc0) == 0xc0) ||
143 name[1] == '_' && (int)strlen(name) > 2))
144 {
c4d0567e 145 if (!isPRINT(name[1]) || strchr("\t\n\r\f", name[1])) {
2b92dfce
GS		 146 /* 1999-02-27 mjd@plover.com */
147 char *p;
148 p = strchr(name, '\0');
149 /* The next block assumes the buffer is at least 205 chars
150 long. At present, it's always at least 256 chars. */
151 if (p-name > 200) {
152 strcpy(name+200, "...");
153 p = name+199;
154 }
155 else {
156 p[1] = '\0';
157 }
158 /* Move everything else down one character */
159 for (; p-name > 2; p--)
160 *p = *(p-1);
46fc3d4c 161 name[2] = toCTRL(name[1]);
162 name[1] = '^';
163 }
cea2e8a9 164 yyerror(Perl_form(aTHX_ "Can't use global %s in \"my\"",name));
a0d0e21e 165 }
599cee73 166 if (ckWARN(WARN_UNSAFE) && AvFILLp(PL_comppad_name) >= 0) {
3280af22
NIS		 167 SV **svp = AvARRAY(PL_comppad_name);
168 for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_floor; off--) {
b1cb66bf 169 if ((sv = svp[off])
3280af22 170 && sv != &PL_sv_undef
c53d7c7d 171 && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0)
b1cb66bf 172 && strEQ(name, SvPVX(sv)))
173 {
cea2e8a9 174 Perl_warner(aTHX_ WARN_UNSAFE,
9fbbe825 175 "\"my\" variable %s masks earlier declaration in same %s",
c53d7c7d 176 name, (SvIVX(sv) == PAD_MAX ? "scope" : "statement"));
b1cb66bf 177 break;
178 }
179 }
180 }
a0d0e21e
LW		 181 off = pad_alloc(OP_PADSV, SVs_PADMY);
182 sv = NEWSV(1102,0);
93a17b20
LW		 183 sv_upgrade(sv, SVt_PVNV);
184 sv_setpv(sv, name);
3280af22 185 if (PL_in_my_stash) {
c750a3ec 186 if (*name != '$')
cea2e8a9 187 yyerror(Perl_form(aTHX_ "Can't declare class for non-scalar %s in \"my\"",
dce40276 188 name));
c750a3ec
MB		 189 SvOBJECT_on(sv);
190 (void)SvUPGRADE(sv, SVt_PVMG);
3280af22
NIS		 191 SvSTASH(sv) = (HV*)SvREFCNT_inc(PL_in_my_stash);
192 PL_sv_objcount++;
c750a3ec 193 }
3280af22 194 av_store(PL_comppad_name, off, sv);
65202027 195 SvNVX(sv) = (NV)PAD_MAX;
8990e307 196 SvIVX(sv) = 0; /* Not yet introduced--see newSTATEOP */
3280af22
NIS		 197 if (!PL_min_intro_pending)
198 PL_min_intro_pending = off;
199 PL_max_intro_pending = off;
93a17b20 200 if (*name == '@')
3280af22 201 av_store(PL_comppad, off, (SV*)newAV());
93a17b20 202 else if (*name == '%')
3280af22
NIS		 203 av_store(PL_comppad, off, (SV*)newHV());
204 SvPADMY_on(PL_curpad[off]);
93a17b20
LW		 205 return off;
206}
207
2680586e
GS		 208#define FINDLEX_NOSEARCH 1 /* don't search outer contexts */
209
76e3520e 210STATIC PADOFFSET
cea2e8a9 211S_pad_findlex(pTHX_ char *name, PADOFFSET newoff, U32 seq, CV* startcv,
864dbfa3 212 I32 cx_ix, I32 saweval, U32 flags)
93a17b20 213{
11343788 214 dTHR;
748a9306 215 CV *cv;
93a17b20
LW		 216 I32 off;
217 SV *sv;
93a17b20 218 register I32 i;
c09156bb 219 register PERL_CONTEXT *cx;
93a17b20 220
748a9306 221 for (cv = startcv; cv; cv = CvOUTSIDE(cv)) {
4fdae800 222 AV *curlist = CvPADLIST(cv);
223 SV **svp = av_fetch(curlist, 0, FALSE);
748a9306 224 AV *curname;
4fdae800 225
3280af22 226 if (!svp || *svp == &PL_sv_undef)
4633a7c4 227 continue;
748a9306
LW		 228 curname = (AV*)*svp;
229 svp = AvARRAY(curname);
93965878 230 for (off = AvFILLp(curname); off > 0; off--) {
748a9306 231 if ((sv = svp[off]) &&
3280af22 232 sv != &PL_sv_undef &&
748a9306 233 seq <= SvIVX(sv) &&
13826f2c 234 seq > I_32(SvNVX(sv)) &&
748a9306
LW		 235 strEQ(SvPVX(sv), name))
236 {
5f05dabc 237 I32 depth;
238 AV *oldpad;
239 SV *oldsv;
240
241 depth = CvDEPTH(cv);
242 if (!depth) {
9607fc9c 243 if (newoff) {
244 if (SvFAKE(sv))
245 continue;
4fdae800 246 return 0; /* don't clone from inactive stack frame */
9607fc9c 247 }
5f05dabc 248 depth = 1;
249 }
250 oldpad = (AV*)*av_fetch(curlist, depth, FALSE);
251 oldsv = *av_fetch(oldpad, off, TRUE);
748a9306 252 if (!newoff) { /* Not a mere clone operation. */
9607fc9c 253 SV *namesv = NEWSV(1103,0);
748a9306 254 newoff = pad_alloc(OP_PADSV, SVs_PADMY);
9607fc9c 255 sv_upgrade(namesv, SVt_PVNV);
256 sv_setpv(namesv, name);
3280af22 257 av_store(PL_comppad_name, newoff, namesv);
65202027 258 SvNVX(namesv) = (NV)PL_curcop->cop_seq;
c53d7c7d 259 SvIVX(namesv) = PAD_MAX; /* A ref, intro immediately */
9607fc9c 260 SvFAKE_on(namesv); /* A ref, not a real var */
87671ffc 261 if (SvOBJECT(sv)) { /* A typed var */
3d93dc8b
GS		 262 SvOBJECT_on(namesv);
263 (void)SvUPGRADE(namesv, SVt_PVMG);
87671ffc 264 SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*)SvSTASH(sv));
3d93dc8b
GS		 265 PL_sv_objcount++;
266 }
3280af22 267 if (CvANON(PL_compcv) || SvTYPE(PL_compcv) == SVt_PVFM) {
28757baa 268 /* "It's closures all the way down." */
3280af22 269 CvCLONE_on(PL_compcv);
54310121 270 if (cv == startcv) {
3280af22 271 if (CvANON(PL_compcv))
54310121 272 oldsv = Nullsv; /* no need to keep ref */
273 }
274 else {
28757baa 275 CV *bcv;
276 for (bcv = startcv;
277 bcv && bcv != cv && !CvCLONE(bcv);
6b35e009
GS		 278 bcv = CvOUTSIDE(bcv))
279 {
28757baa 280 if (CvANON(bcv))
281 CvCLONE_on(bcv);
282 else {
6b35e009
GS		 283 if (ckWARN(WARN_CLOSURE)
284 && !CvUNIQUE(bcv) && !CvUNIQUE(cv))
285 {
cea2e8a9 286 Perl_warner(aTHX_ WARN_CLOSURE,
44a8e56a 287 "Variable \"%s\" may be unavailable",
28757baa 288 name);
6b35e009 289 }
28757baa 290 break;
291 }
292 }
293 }
294 }
3280af22 295 else if (!CvUNIQUE(PL_compcv)) {
599cee73 296 if (ckWARN(WARN_CLOSURE) && !SvFAKE(sv) && !CvUNIQUE(cv))
cea2e8a9 297 Perl_warner(aTHX_ WARN_CLOSURE,
599cee73 298 "Variable \"%s\" will not stay shared", name);
5f05dabc 299 }
748a9306 300 }
3280af22 301 av_store(PL_comppad, newoff, SvREFCNT_inc(oldsv));
748a9306
LW		 302 return newoff;
303 }
93a17b20
LW		 304 }
305 }
306
2680586e
GS		 307 if (flags & FINDLEX_NOSEARCH)
308 return 0;
309
93a17b20
LW		 310 /* Nothing in current lexical context--try eval's context, if any.
311 * This is necessary to let the perldb get at lexically scoped variables.
312 * XXX This will also probably interact badly with eval tree caching.
313 */
314
748a9306 315 for (i = cx_ix; i >= 0; i--) {
93a17b20 316 cx = &cxstack[i];
6b35e009 317 switch (CxTYPE(cx)) {
93a17b20 318 default:
748a9306
LW		 319 if (i == 0 && saweval) {
320 seq = cxstack[saweval].blk_oldcop->cop_seq;
2680586e 321 return pad_findlex(name, newoff, seq, PL_main_cv, -1, saweval, 0);
748a9306 322 }
93a17b20
LW		 323 break;
324 case CXt_EVAL:
44a8e56a 325 switch (cx->blk_eval.old_op_type) {
326 case OP_ENTEREVAL:
6b35e009
GS		 327 if (CxREALEVAL(cx))
328 saweval = i;
44a8e56a 329 break;
330 case OP_REQUIRE:
331 /* require must have its own scope */
332 return 0;
333 }
93a17b20
LW		 334 break;
335 case CXt_SUB:
336 if (!saweval)
337 return 0;
338 cv = cx->blk_sub.cv;
3280af22 339 if (PL_debstash && CvSTASH(cv) == PL_debstash) { /* ignore DB'* scope */
748a9306 340 saweval = i; /* so we know where we were called from */
93a17b20 341 continue;
93a17b20 342 }
748a9306 343 seq = cxstack[saweval].blk_oldcop->cop_seq;
2680586e 344 return pad_findlex(name, newoff, seq, cv, i-1, saweval,FINDLEX_NOSEARCH);
93a17b20
LW		 345 }
346 }
347
748a9306
LW		 348 return 0;
349}
a0d0e21e 350
748a9306 351PADOFFSET
864dbfa3 352Perl_pad_findmy(pTHX_ char *name)
748a9306 353{
11343788 354 dTHR;
748a9306 355 I32 off;
54310121 356 I32 pendoff = 0;
748a9306 357 SV *sv;
3280af22
NIS		 358 SV **svp = AvARRAY(PL_comppad_name);
359 U32 seq = PL_cop_seqmax;
6b35e009 360 PERL_CONTEXT *cx;
33b8ce05 361 CV *outside;
748a9306 362
11343788
MB		 363#ifdef USE_THREADS
364 /*
365 * Special case to get lexical (and hence per-thread) @_.
366 * XXX I need to find out how to tell at parse-time whether use
367 * of @_ should refer to a lexical (from a sub) or defgv (global
368 * scope and maybe weird sub-ish things like formats). See
369 * startsub in perly.y. It's possible that @_ could be lexical
370 * (at least from subs) even in non-threaded perl.
371 */
372 if (strEQ(name, "@_"))
373 return 0; /* success. (NOT_IN_PAD indicates failure) */
374#endif /* USE_THREADS */
375
748a9306 376 /* The one we're looking for is probably just before comppad_name_fill. */
3280af22 377 for (off = AvFILLp(PL_comppad_name); off > 0; off--) {
a0d0e21e 378 if ((sv = svp[off]) &&
3280af22 379 sv != &PL_sv_undef &&
54310121 380 (!SvIVX(sv) ||
381 (seq <= SvIVX(sv) &&
382 seq > I_32(SvNVX(sv)))) &&
a0d0e21e
LW		 383 strEQ(SvPVX(sv), name))
384 {
54310121 385 if (SvIVX(sv))
386 return (PADOFFSET)off;
387 pendoff = off; /* this pending def. will override import */
a0d0e21e
LW		 388 }
389 }
748a9306 390
33b8ce05
GS		 391 outside = CvOUTSIDE(PL_compcv);
392
393 /* Check if if we're compiling an eval'', and adjust seq to be the
394 * eval's seq number. This depends on eval'' having a non-null
395 * CvOUTSIDE() while it is being compiled. The eval'' itself is
1aff0e91
GS		 396 * identified by CvEVAL being true and CvGV being null. */
397 if (outside && CvEVAL(PL_compcv) && !CvGV(PL_compcv) && cxstack_ix >= 0) {
6b35e009
GS		 398 cx = &cxstack[cxstack_ix];
399 if (CxREALEVAL(cx))
400 seq = cx->blk_oldcop->cop_seq;
401 }
402
748a9306 403 /* See if it's in a nested scope */
2680586e 404 off = pad_findlex(name, 0, seq, outside, cxstack_ix, 0, 0);
54310121 405 if (off) {
406 /* If there is a pending local definition, this new alias must die */
407 if (pendoff)
3280af22 408 SvIVX(AvARRAY(PL_comppad_name)[off]) = seq;
11343788 409 return off; /* pad_findlex returns 0 for failure...*/
54310121 410 }
11343788 411 return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */
93a17b20
LW		 412}
413
414void
864dbfa3 415Perl_pad_leavemy(pTHX_ I32 fill)
93a17b20 416{
0453d815 417 dTHR;
93a17b20 418 I32 off;
3280af22 419 SV **svp = AvARRAY(PL_comppad_name);
93a17b20 420 SV *sv;
3280af22
NIS		 421 if (PL_min_intro_pending && fill < PL_min_intro_pending) {
422 for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) {
0453d815
PM		 423 if ((sv = svp[off]) && sv != &PL_sv_undef && ckWARN_d(WARN_INTERNAL))
424 Perl_warner(aTHX_ WARN_INTERNAL, "%s never introduced", SvPVX(sv));
8990e307
LW		 425 }
426 }
427 /* "Deintroduce" my variables that are leaving with this scope. */
3280af22 428 for (off = AvFILLp(PL_comppad_name); off > fill; off--) {
c53d7c7d 429 if ((sv = svp[off]) && sv != &PL_sv_undef && SvIVX(sv) == PAD_MAX)
3280af22 430 SvIVX(sv) = PL_cop_seqmax;
93a17b20
LW		 431 }
432}
433
434PADOFFSET
864dbfa3 435Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype)
79072805 436{
11343788 437 dTHR;
79072805
LW		 438 SV *sv;
439 I32 retval;
440
3280af22 441 if (AvARRAY(PL_comppad) != PL_curpad)
cea2e8a9 442 Perl_croak(aTHX_ "panic: pad_alloc");
3280af22 443 if (PL_pad_reset_pending)
a0d0e21e 444 pad_reset();
ed6116ce 445 if (tmptype & SVs_PADMY) {
79072805 446 do {
3280af22 447 sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE);
ed6116ce 448 } while (SvPADBUSY(sv)); /* need a fresh one */
3280af22 449 retval = AvFILLp(PL_comppad);
79072805
LW		 450 }
451 else {
3280af22
NIS		 452 SV **names = AvARRAY(PL_comppad_name);
453 SSize_t names_fill = AvFILLp(PL_comppad_name);
bbce6d69 454 for (;;) {
455 /*
456 * "foreach" index vars temporarily become aliases to non-"my"
457 * values. Thus we must skip, not just pad values that are
458 * marked as current pad values, but also those with names.
459 */
3280af22
NIS		 460 if (++PL_padix <= names_fill &&
461 (sv = names[PL_padix]) && sv != &PL_sv_undef)
bbce6d69 462 continue;
3280af22 463 sv = *av_fetch(PL_comppad, PL_padix, TRUE);
bbce6d69 464 if (!(SvFLAGS(sv) & (SVs_PADTMP|SVs_PADMY)))
465 break;
466 }
3280af22 467 retval = PL_padix;
79072805 468 }
8990e307 469 SvFLAGS(sv) |= tmptype;
3280af22 470 PL_curpad = AvARRAY(PL_comppad);
11343788 471#ifdef USE_THREADS
5dc0d613 472 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx alloc %ld for %s\n",
533c011a 473 (unsigned long) thr, (unsigned long) PL_curpad,
22c35a8c 474 (long) retval, PL_op_name[optype]));
11343788 475#else
d9bb4600 476 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx alloc %ld for %s\n",
3280af22 477 (unsigned long) PL_curpad,
22c35a8c 478 (long) retval, PL_op_name[optype]));
11343788 479#endif /* USE_THREADS */
79072805
LW		 480 return (PADOFFSET)retval;
481}
482
483SV *
864dbfa3 484Perl_pad_sv(pTHX_ PADOFFSET po)
79072805 485{
11343788
MB		 486 dTHR;
487#ifdef USE_THREADS
5dc0d613 488 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx sv %d\n",
533c011a 489 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 490#else
79072805 491 if (!po)
cea2e8a9 492 Perl_croak(aTHX_ "panic: pad_sv po");
d9bb4600 493 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx sv %d\n",
3280af22 494 (unsigned long) PL_curpad, po));
11343788 495#endif /* USE_THREADS */
3280af22 496 return PL_curpad[po]; /* eventually we'll turn this into a macro */
79072805
LW		 497}
498
499void
864dbfa3 500Perl_pad_free(pTHX_ PADOFFSET po)
79072805 501{
11343788 502 dTHR;
3280af22 503 if (!PL_curpad)
a0d0e21e 504 return;
3280af22 505 if (AvARRAY(PL_comppad) != PL_curpad)
cea2e8a9 506 Perl_croak(aTHX_ "panic: pad_free curpad");
79072805 507 if (!po)
cea2e8a9 508 Perl_croak(aTHX_ "panic: pad_free po");
11343788 509#ifdef USE_THREADS
5dc0d613 510 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx free %d\n",
533c011a 511 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 512#else
d9bb4600 513 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx free %d\n",
3280af22 514 (unsigned long) PL_curpad, po));
11343788 515#endif /* USE_THREADS */
3280af22
NIS		 516 if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef)
517 SvPADTMP_off(PL_curpad[po]);
518 if ((I32)po < PL_padix)
519 PL_padix = po - 1;
79072805
LW		 520}
521
522void
864dbfa3 523Perl_pad_swipe(pTHX_ PADOFFSET po)
79072805 524{
11343788 525 dTHR;
3280af22 526 if (AvARRAY(PL_comppad) != PL_curpad)
cea2e8a9 527 Perl_croak(aTHX_ "panic: pad_swipe curpad");
79072805 528 if (!po)
cea2e8a9 529 Perl_croak(aTHX_ "panic: pad_swipe po");
11343788 530#ifdef USE_THREADS
5dc0d613 531 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx swipe %d\n",
533c011a 532 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 533#else
d9bb4600 534 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx swipe %d\n",
3280af22 535 (unsigned long) PL_curpad, po));
11343788 536#endif /* USE_THREADS */
3280af22
NIS		 537 SvPADTMP_off(PL_curpad[po]);
538 PL_curpad[po] = NEWSV(1107,0);
539 SvPADTMP_on(PL_curpad[po]);
540 if ((I32)po < PL_padix)
541 PL_padix = po - 1;
79072805
LW		 542}
543
d9bb4600
GS		 544/* XXX pad_reset() is currently disabled because it results in serious bugs.
545 * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed
546 * on the stack by OPs that use them, there are several ways to get an alias
547 * to a shared TARG. Such an alias will change randomly and unpredictably.
548 * We avoid doing this until we can think of a Better Way.
549 * GSAR 97-10-29 */
79072805 550void
864dbfa3 551Perl_pad_reset(pTHX)
79072805 552{
d9bb4600 553#ifdef USE_BROKEN_PAD_RESET
11343788 554 dTHR;
79072805
LW		 555 register I32 po;
556
6b88bc9c 557 if (AvARRAY(PL_comppad) != PL_curpad)
cea2e8a9 558 Perl_croak(aTHX_ "panic: pad_reset curpad");
11343788 559#ifdef USE_THREADS
5dc0d613 560 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx reset\n",
6b88bc9c 561 (unsigned long) thr, (unsigned long) PL_curpad));
11343788 562#else
d9bb4600 563 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx reset\n",
6b88bc9c 564 (unsigned long) PL_curpad));
11343788 565#endif /* USE_THREADS */
6b88bc9c
GS		 566 if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */
567 for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) {
568 if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po]))
569 SvPADTMP_off(PL_curpad[po]);
748a9306 570 }
6b88bc9c 571 PL_padix = PL_padix_floor;
79072805 572 }
d9bb4600 573#endif
3280af22 574 PL_pad_reset_pending = FALSE;
79072805
LW		 575}
576
a863c7d1 577#ifdef USE_THREADS
54b9620d 578/* find_threadsv is not reentrant */
a863c7d1 579PADOFFSET
864dbfa3 580Perl_find_threadsv(pTHX_ const char *name)
a863c7d1
MB		 581{
582 dTHR;
583 char *p;
584 PADOFFSET key;
554b3eca 585 SV **svp;
54b9620d 586 /* We currently only handle names of a single character */
533c011a 587 p = strchr(PL_threadsv_names, *name);
a863c7d1
MB		 588 if (!p)
589 return NOT_IN_PAD;
533c011a 590 key = p - PL_threadsv_names;
2d8e6c8d 591 MUTEX_LOCK(&thr->mutex);
54b9620d 592 svp = av_fetch(thr->threadsv, key, FALSE);
2d8e6c8d
GS		 593 if (svp)
594 MUTEX_UNLOCK(&thr->mutex);
595 else {
554b3eca 596 SV *sv = NEWSV(0, 0);
54b9620d 597 av_store(thr->threadsv, key, sv);
940cb80d 598 thr->threadsvp = AvARRAY(thr->threadsv);
2d8e6c8d 599 MUTEX_UNLOCK(&thr->mutex);
554b3eca
MB		 600 /*
601 * Some magic variables used to be automagically initialised
602 * in gv_fetchpv. Those which are now per-thread magicals get
603 * initialised here instead.
604 */
605 switch (*name) {
54b9620d
MB		 606 case '_':
607 break;
554b3eca
MB		 608 case ';':
609 sv_setpv(sv, "\034");
54b9620d 610 sv_magic(sv, 0, 0, name, 1);
554b3eca 611 break;
c277df42
IZ		 612 case '&':
613 case '`':
614 case '\'':
533c011a 615 PL_sawampersand = TRUE;
a3f914c5
GS		 616 /* FALL THROUGH */
617 case '1':
618 case '2':
619 case '3':
620 case '4':
621 case '5':
622 case '6':
623 case '7':
624 case '8':
625 case '9':
c277df42 626 SvREADONLY_on(sv);
d8b5173a 627 /* FALL THROUGH */
067391ea
GS		 628
629 /* XXX %! tied to Errno.pm needs to be added here.
630 * See gv_fetchpv(). */
631 /* case '!': */
632
54b9620d
MB		 633 default:
634 sv_magic(sv, 0, 0, name, 1);
554b3eca 635 }
8b73bbec 636 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
54b9620d 637 "find_threadsv: new SV %p for $%s%c\n",
554b3eca
MB		 638 sv, (*name < 32) ? "^" : "",
639 (*name < 32) ? toCTRL(*name) : *name));
a863c7d1
MB		 640 }
641 return key;
642}
643#endif /* USE_THREADS */
644
79072805
LW		 645/* Destructor */
646
647void
864dbfa3 648Perl_op_free(pTHX_ OP *o)
79072805 649{
85e6fe83 650 register OP *kid, *nextkid;
79072805 651
5dc0d613 652 if (!o || o->op_seq == (U16)-1)
79072805
LW		 653 return;
654
11343788
MB		 655 if (o->op_flags & OPf_KIDS) {
656 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 657 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 658 op_free(kid);
85e6fe83 659 }
79072805
LW		 660 }
661
11343788 662 switch (o->op_type) {
8990e307 663 case OP_NULL:
11343788 664 o->op_targ = 0; /* Was holding old type, if any. */
8990e307 665 break;
a0d0e21e 666 case OP_ENTEREVAL:
11343788 667 o->op_targ = 0; /* Was holding hints. */
a0d0e21e 668 break;
554b3eca 669#ifdef USE_THREADS
8dd3ba40
SM		 670 case OP_ENTERITER:
671 if (!(o->op_flags & OPf_SPECIAL))
672 break;
673 /* FALL THROUGH */
2faa37cc 674 case OP_THREADSV:
54b9620d 675 o->op_targ = 0; /* Was holding index into thr->threadsv AV. */
554b3eca
MB		 676 break;
677#endif /* USE_THREADS */
a6006777 678 default:
ac4c12e7 679 if (!(o->op_flags & OPf_REF)
cea2e8a9 680 || (PL_check[o->op_type] != FUNC_NAME_TO_PTR(Perl_ck_ftst)))
a6006777 681 break;
682 /* FALL THROUGH */
463ee0b2 683 case OP_GVSV:
79072805 684 case OP_GV:
a6006777 685 case OP_AELEMFAST:
11343788 686 SvREFCNT_dec(cGVOPo->op_gv);
8990e307
LW		 687 break;
688 case OP_NEXTSTATE:
689 case OP_DBSTATE:
3eb57f73 690 cop_free((COP*)o);
79072805
LW		 691 break;
692 case OP_CONST:
11343788 693 SvREFCNT_dec(cSVOPo->op_sv);
79072805 694 break;
748a9306
LW		 695 case OP_GOTO:
696 case OP_NEXT:
697 case OP_LAST:
698 case OP_REDO:
11343788 699 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 700 break;
701 /* FALL THROUGH */
a0d0e21e 702 case OP_TRANS:
a0ed51b3
LW		 703 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF))
704 SvREFCNT_dec(cSVOPo->op_sv);
705 else
706 Safefree(cPVOPo->op_pv);
a0d0e21e
LW		 707 break;
708 case OP_SUBST:
11343788 709 op_free(cPMOPo->op_pmreplroot);
a0d0e21e 710 /* FALL THROUGH */
748a9306 711 case OP_PUSHRE:
a0d0e21e 712 case OP_MATCH:
8782bef2 713 case OP_QR:
c277df42 714 ReREFCNT_dec(cPMOPo->op_pmregexp);
a0d0e21e 715 break;
79072805
LW		 716 }
717
11343788
MB		 718 if (o->op_targ > 0)
719 pad_free(o->op_targ);
8990e307 720
b7dc083c
NIS		 721#ifdef PL_OP_SLAB_ALLOC
722 if ((char *) o == PL_OpPtr)
723 {
724 }
725#else
11343788 726 Safefree(o);
b7dc083c 727#endif
79072805
LW		 728}
729
76e3520e 730STATIC void
3eb57f73
HS		 731S_cop_free(pTHX_ COP* cop)
732{
733 Safefree(cop->cop_label);
734 SvREFCNT_dec(cop->cop_filegv);
0453d815 735 if (! specialWARN(cop->cop_warnings))
3eb57f73
HS		 736 SvREFCNT_dec(cop->cop_warnings);
737}
738
739STATIC void
cea2e8a9 740S_null(pTHX_ OP *o)
8990e307 741{
54b9620d 742 if (o->op_type != OP_NULL && o->op_type != OP_THREADSV && o->op_targ > 0)
11343788
MB		 743 pad_free(o->op_targ);
744 o->op_targ = o->op_type;
745 o->op_type = OP_NULL;
22c35a8c 746 o->op_ppaddr = PL_ppaddr[OP_NULL];
8990e307
LW		 747}
748
79072805
LW		 749/* Contextualizers */
750
463ee0b2 751#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 752
753OP *
864dbfa3 754Perl_linklist(pTHX_ OP *o)
79072805
LW		 755{
756 register OP *kid;
757
11343788
MB		 758 if (o->op_next)
759 return o->op_next;
79072805
LW		 760
761 /* establish postfix order */
11343788
MB		 762 if (cUNOPo->op_first) {
763 o->op_next = LINKLIST(cUNOPo->op_first);
764 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 765 if (kid->op_sibling)
766 kid->op_next = LINKLIST(kid->op_sibling);
767 else
11343788 768 kid->op_next = o;
79072805
LW		 769 }
770 }
771 else
11343788 772 o->op_next = o;
79072805 773
11343788 774 return o->op_next;
79072805
LW		 775}
776
777OP *
864dbfa3 778Perl_scalarkids(pTHX_ OP *o)
79072805
LW		 779{
780 OP *kid;
11343788
MB		 781 if (o && o->op_flags & OPf_KIDS) {
782 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 783 scalar(kid);
784 }
11343788 785 return o;
79072805
LW		 786}
787
76e3520e 788STATIC OP *
cea2e8a9 789S_scalarboolean(pTHX_ OP *o)
8990e307 790{
d008e5eb 791 if (o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
0f15f207 792 dTHR;
d008e5eb
GS		 793 if (ckWARN(WARN_SYNTAX)) {
794 line_t oldline = PL_curcop->cop_line;
a0d0e21e 795
d008e5eb
GS		 796 if (PL_copline != NOLINE)
797 PL_curcop->cop_line = PL_copline;
cea2e8a9 798 Perl_warner(aTHX_ WARN_SYNTAX, "Found = in conditional, should be ==");
d008e5eb
GS		 799 PL_curcop->cop_line = oldline;
800 }
a0d0e21e 801 }
11343788 802 return scalar(o);
8990e307
LW		 803}
804
805OP *
864dbfa3 806Perl_scalar(pTHX_ OP *o)
79072805
LW		 807{
808 OP *kid;
809
a0d0e21e 810 /* assumes no premature commitment */
3280af22 811 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 812 || o->op_type == OP_RETURN)
11343788 813 return o;
79072805 814
b162f9ea
IZ		 815 if ((o->op_private & OPpTARGET_MY)
816 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
817 return scalar(o); /* As if inside SASSIGN */
818
5dc0d613 819 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 820
11343788 821 switch (o->op_type) {
79072805 822 case OP_REPEAT:
11343788
MB		 823 if (o->op_private & OPpREPEAT_DOLIST)
824 null(((LISTOP*)cBINOPo->op_first)->op_first);
825 scalar(cBINOPo->op_first);
8990e307 826 break;
79072805
LW		 827 case OP_OR:
828 case OP_AND:
829 case OP_COND_EXPR:
11343788 830 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 831 scalar(kid);
79072805 832 break;
a0d0e21e 833 case OP_SPLIT:
11343788 834 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 835 if (!kPMOP->op_pmreplroot)
836 deprecate("implicit split to @_");
837 }
838 /* FALL THROUGH */
79072805 839 case OP_MATCH:
8782bef2 840 case OP_QR:
79072805
LW		 841 case OP_SUBST:
842 case OP_NULL:
8990e307 843 default:
11343788
MB		 844 if (o->op_flags & OPf_KIDS) {
845 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 846 scalar(kid);
847 }
79072805
LW		 848 break;
849 case OP_LEAVE:
850 case OP_LEAVETRY:
5dc0d613 851 kid = cLISTOPo->op_first;
54310121 852 scalar(kid);
853 while (kid = kid->op_sibling) {
854 if (kid->op_sibling)
855 scalarvoid(kid);
856 else
857 scalar(kid);
858 }
3280af22 859 WITH_THR(PL_curcop = &PL_compiling);
54310121 860 break;
748a9306 861 case OP_SCOPE:
79072805 862 case OP_LINESEQ:
8990e307 863 case OP_LIST:
11343788 864 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 865 if (kid->op_sibling)
866 scalarvoid(kid);
867 else
868 scalar(kid);
869 }
3280af22 870 WITH_THR(PL_curcop = &PL_compiling);
79072805
LW		 871 break;
872 }
11343788 873 return o;
79072805
LW		 874}
875
876OP *
864dbfa3 877Perl_scalarvoid(pTHX_ OP *o)
79072805
LW		 878{
879 OP *kid;
8990e307
LW		 880 char* useless = 0;
881 SV* sv;
2ebea0a1
GS		 882 U8 want;
883
884 if (o->op_type == OP_NEXTSTATE || o->op_type == OP_DBSTATE ||
885 (o->op_type == OP_NULL &&
886 (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)))
887 {
888 dTHR;
889 PL_curcop = (COP*)o; /* for warning below */
890 }
79072805 891
54310121 892 /* assumes no premature commitment */
2ebea0a1
GS		 893 want = o->op_flags & OPf_WANT;
894 if ((want && want != OPf_WANT_SCALAR) || PL_error_count
5dc0d613 895 || o->op_type == OP_RETURN)
11343788 896 return o;
79072805 897
b162f9ea
IZ		 898 if ((o->op_private & OPpTARGET_MY)
899 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
900 return scalar(o); /* As if inside SASSIGN */
901
5dc0d613 902 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 903
11343788 904 switch (o->op_type) {
79072805 905 default:
22c35a8c 906 if (!(PL_opargs[o->op_type] & OA_FOLDCONST))
8990e307 907 break;
36477c24 908 /* FALL THROUGH */
909 case OP_REPEAT:
11343788 910 if (o->op_flags & OPf_STACKED)
8990e307 911 break;
5d82c453
GA		 912 goto func_ops;
913 case OP_SUBSTR:
914 if (o->op_private == 4)
915 break;
8990e307
LW		 916 /* FALL THROUGH */
917 case OP_GVSV:
918 case OP_WANTARRAY:
919 case OP_GV:
920 case OP_PADSV:
921 case OP_PADAV:
922 case OP_PADHV:
923 case OP_PADANY:
924 case OP_AV2ARYLEN:
8990e307 925 case OP_REF:
a0d0e21e
LW		 926 case OP_REFGEN:
927 case OP_SREFGEN:
8990e307
LW		 928 case OP_DEFINED:
929 case OP_HEX:
930 case OP_OCT:
931 case OP_LENGTH:
8990e307
LW		 932 case OP_VEC:
933 case OP_INDEX:
934 case OP_RINDEX:
935 case OP_SPRINTF:
936 case OP_AELEM:
937 case OP_AELEMFAST:
938 case OP_ASLICE:
8990e307
LW		 939 case OP_HELEM:
940 case OP_HSLICE:
941 case OP_UNPACK:
942 case OP_PACK:
8990e307
LW		 943 case OP_JOIN:
944 case OP_LSLICE:
945 case OP_ANONLIST:
946 case OP_ANONHASH:
947 case OP_SORT:
948 case OP_REVERSE:
949 case OP_RANGE:
950 case OP_FLIP:
951 case OP_FLOP:
952 case OP_CALLER:
953 case OP_FILENO:
954 case OP_EOF:
955 case OP_TELL:
956 case OP_GETSOCKNAME:
957 case OP_GETPEERNAME:
958 case OP_READLINK:
959 case OP_TELLDIR:
960 case OP_GETPPID:
961 case OP_GETPGRP:
962 case OP_GETPRIORITY:
963 case OP_TIME:
964 case OP_TMS:
965 case OP_LOCALTIME:
966 case OP_GMTIME:
967 case OP_GHBYNAME:
968 case OP_GHBYADDR:
969 case OP_GHOSTENT:
970 case OP_GNBYNAME:
971 case OP_GNBYADDR:
972 case OP_GNETENT:
973 case OP_GPBYNAME:
974 case OP_GPBYNUMBER:
975 case OP_GPROTOENT:
976 case OP_GSBYNAME:
977 case OP_GSBYPORT:
978 case OP_GSERVENT:
979 case OP_GPWNAM:
980 case OP_GPWUID:
981 case OP_GGRNAM:
982 case OP_GGRGID:
983 case OP_GETLOGIN:
5d82c453 984 func_ops:
11343788 985 if (!(o->op_private & OPpLVAL_INTRO))
22c35a8c 986 useless = PL_op_desc[o->op_type];
8990e307
LW		 987 break;
988
989 case OP_RV2GV:
990 case OP_RV2SV:
991 case OP_RV2AV:
992 case OP_RV2HV:
11343788
MB		 993 if (!(o->op_private & OPpLVAL_INTRO) &&
994 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 995 useless = "a variable";
996 break;
79072805
LW		 997
998 case OP_CONST:
11343788 999 sv = cSVOPo->op_sv;
7a52d87a
GS		 1000 if (cSVOPo->op_private & OPpCONST_STRICT)
1001 no_bareword_allowed(o);
1002 else {
d008e5eb
GS		 1003 dTHR;
1004 if (ckWARN(WARN_VOID)) {
1005 useless = "a constant";
1006 if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
1007 useless = 0;
1008 else if (SvPOK(sv)) {
1009 if (strnEQ(SvPVX(sv), "di", 2) ||
1010 strnEQ(SvPVX(sv), "ds", 2) ||
1011 strnEQ(SvPVX(sv), "ig", 2))
1012 useless = 0;
1013 }
8990e307
LW		 1014 }
1015 }
11343788 1016 null(o); /* don't execute a constant */
8990e307 1017 SvREFCNT_dec(sv); /* don't even remember it */
79072805
LW		 1018 break;
1019
1020 case OP_POSTINC:
11343788 1021 o->op_type = OP_PREINC; /* pre-increment is faster */
22c35a8c 1022 o->op_ppaddr = PL_ppaddr[OP_PREINC];
79072805
LW		 1023 break;
1024
1025 case OP_POSTDEC:
11343788 1026 o->op_type = OP_PREDEC; /* pre-decrement is faster */
22c35a8c 1027 o->op_ppaddr = PL_ppaddr[OP_PREDEC];
79072805
LW		 1028 break;
1029
79072805
LW		 1030 case OP_OR:
1031 case OP_AND:
1032 case OP_COND_EXPR:
11343788 1033 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 1034 scalarvoid(kid);
1035 break;
5aabfad6 1036
a0d0e21e 1037 case OP_NULL:
11343788 1038 if (o->op_flags & OPf_STACKED)
a0d0e21e 1039 break;
5aabfad6 1040 /* FALL THROUGH */
2ebea0a1
GS		 1041 case OP_NEXTSTATE:
1042 case OP_DBSTATE:
79072805
LW		 1043 case OP_ENTERTRY:
1044 case OP_ENTER:
1045 case OP_SCALAR:
11343788 1046 if (!(o->op_flags & OPf_KIDS))
79072805 1047 break;
54310121 1048 /* FALL THROUGH */
463ee0b2 1049 case OP_SCOPE:
79072805
LW		 1050 case OP_LEAVE:
1051 case OP_LEAVETRY:
a0d0e21e 1052 case OP_LEAVELOOP:
79072805 1053 case OP_LINESEQ:
79072805 1054 case OP_LIST:
11343788 1055 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 1056 scalarvoid(kid);
1057 break;
c90c0ff4 1058 case OP_ENTEREVAL:
5196be3e 1059 scalarkids(o);
c90c0ff4 1060 break;
5aabfad6 1061 case OP_REQUIRE:
c90c0ff4 1062 /* all requires must return a boolean value */
5196be3e
MB		 1063 o->op_flags &= ~OPf_WANT;
1064 return scalar(o);
a0d0e21e 1065 case OP_SPLIT:
11343788 1066 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 1067 if (!kPMOP->op_pmreplroot)
1068 deprecate("implicit split to @_");
1069 }
1070 break;
79072805 1071 }
d008e5eb
GS		 1072 if (useless) {
1073 dTHR;
1074 if (ckWARN(WARN_VOID))
cea2e8a9 1075 Perl_warner(aTHX_ WARN_VOID, "Useless use of %s in void context", useless);
d008e5eb 1076 }
11343788 1077 return o;
79072805
LW		 1078}
1079
1080OP *
864dbfa3 1081Perl_listkids(pTHX_ OP *o)
79072805
LW		 1082{
1083 OP *kid;
11343788
MB		 1084 if (o && o->op_flags & OPf_KIDS) {
1085 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 1086 list(kid);
1087 }
11343788 1088 return o;
79072805
LW		 1089}
1090
1091OP *
864dbfa3 1092Perl_list(pTHX_ OP *o)
79072805
LW		 1093{
1094 OP *kid;
1095
a0d0e21e 1096 /* assumes no premature commitment */
3280af22 1097 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 1098 || o->op_type == OP_RETURN)
11343788 1099 return o;
79072805 1100
b162f9ea
IZ		 1101 if ((o->op_private & OPpTARGET_MY)
1102 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
1103 return o; /* As if inside SASSIGN */
1104
5dc0d613 1105 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 1106
11343788 1107 switch (o->op_type) {
79072805
LW		 1108 case OP_FLOP:
1109 case OP_REPEAT:
11343788 1110 list(cBINOPo->op_first);
79072805
LW		 1111 break;
1112 case OP_OR:
1113 case OP_AND:
1114 case OP_COND_EXPR:
11343788 1115 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 1116 list(kid);
1117 break;
1118 default:
1119 case OP_MATCH:
8782bef2 1120 case OP_QR:
79072805
LW		 1121 case OP_SUBST:
1122 case OP_NULL:
11343788 1123 if (!(o->op_flags & OPf_KIDS))
79072805 1124 break;
11343788
MB		 1125 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
1126 list(cBINOPo->op_first);
1127 return gen_constant_list(o);
79072805
LW		 1128 }
1129 case OP_LIST:
11343788 1130 listkids(o);
79072805
LW		 1131 break;
1132 case OP_LEAVE:
1133 case OP_LEAVETRY:
5dc0d613 1134 kid = cLISTOPo->op_first;
54310121 1135 list(kid);
1136 while (kid = kid->op_sibling) {
1137 if (kid->op_sibling)
1138 scalarvoid(kid);
1139 else
1140 list(kid);
1141 }
3280af22 1142 WITH_THR(PL_curcop = &PL_compiling);
54310121 1143 break;
748a9306 1144 case OP_SCOPE:
79072805 1145 case OP_LINESEQ:
11343788 1146 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 1147 if (kid->op_sibling)
1148 scalarvoid(kid);
1149 else
1150 list(kid);
1151 }
3280af22 1152 WITH_THR(PL_curcop = &PL_compiling);
79072805 1153 break;
c90c0ff4 1154 case OP_REQUIRE:
1155 /* all requires must return a boolean value */
5196be3e
MB		 1156 o->op_flags &= ~OPf_WANT;
1157 return scalar(o);
79072805 1158 }
11343788 1159 return o;
79072805
LW		 1160}
1161
1162OP *
864dbfa3 1163Perl_scalarseq(pTHX_ OP *o)
79072805
LW		 1164{
1165 OP *kid;
1166
11343788
MB		 1167 if (o) {
1168 if (o->op_type == OP_LINESEQ ||
1169 o->op_type == OP_SCOPE ||
1170 o->op_type == OP_LEAVE ||
1171 o->op_type == OP_LEAVETRY)
463ee0b2 1172 {
0f15f207 1173 dTHR;
11343788 1174 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 1175 if (kid->op_sibling) {
463ee0b2 1176 scalarvoid(kid);
ed6116ce 1177 }
463ee0b2 1178 }
3280af22 1179 PL_curcop = &PL_compiling;
79072805 1180 }
11343788 1181 o->op_flags &= ~OPf_PARENS;
3280af22 1182 if (PL_hints & HINT_BLOCK_SCOPE)
11343788 1183 o->op_flags |= OPf_PARENS;
79072805 1184 }
8990e307 1185 else
11343788
MB		 1186 o = newOP(OP_STUB, 0);
1187 return o;
79072805
LW		 1188}
1189
76e3520e 1190STATIC OP *
cea2e8a9 1191S_modkids(pTHX_ OP *o, I32 type)
79072805
LW		 1192{
1193 OP *kid;
11343788
MB		 1194 if (o && o->op_flags & OPf_KIDS) {
1195 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 1196 mod(kid, type);
79072805 1197 }
11343788 1198 return o;
79072805
LW		 1199}
1200
79072805 1201OP *
864dbfa3 1202Perl_mod(pTHX_ OP *o, I32 type)
79072805 1203{
11343788 1204 dTHR;
79072805
LW		 1205 OP *kid;
1206 SV *sv;
2d8e6c8d 1207 STRLEN n_a;
79072805 1208
3280af22 1209 if (!o || PL_error_count)
11343788 1210 return o;
79072805 1211
b162f9ea
IZ		 1212 if ((o->op_private & OPpTARGET_MY)
1213 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
1214 return o;
1215
11343788 1216 switch (o->op_type) {
68dc0745 1217 case OP_UNDEF:
3280af22 1218 PL_modcount++;
5dc0d613 1219 return o;
a0d0e21e 1220 case OP_CONST:
11343788 1221 if (!(o->op_private & (OPpCONST_ARYBASE)))
a0d0e21e 1222 goto nomod;
3280af22
NIS		 1223 if (PL_eval_start && PL_eval_start->op_type == OP_CONST) {
1224 PL_compiling.cop_arybase = (I32)SvIV(((SVOP*)PL_eval_start)->op_sv);
1225 PL_eval_start = 0;
a0d0e21e
LW		 1226 }
1227 else if (!type) {
3280af22
NIS		 1228 SAVEI32(PL_compiling.cop_arybase);
1229 PL_compiling.cop_arybase = 0;
a0d0e21e
LW		 1230 }
1231 else if (type == OP_REFGEN)
1232 goto nomod;
1233 else
cea2e8a9 1234 Perl_croak(aTHX_ "That use of $[ is unsupported");
a0d0e21e 1235 break;
5f05dabc 1236 case OP_STUB:
5196be3e 1237 if (o->op_flags & OPf_PARENS)
5f05dabc 1238 break;
1239 goto nomod;
a0d0e21e
LW		 1240 case OP_ENTERSUB:
1241 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1242 !(o->op_flags & OPf_STACKED)) {
1243 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1244 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788
MB		 1245 assert(cUNOPo->op_first->op_type == OP_NULL);
1246 null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1247 break;
1248 }
1249 /* FALL THROUGH */
1250 default:
a0d0e21e
LW		 1251 nomod:
1252 /* grep, foreach, subcalls, refgen */
1253 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
1254 break;
cea2e8a9 1255 yyerror(Perl_form(aTHX_ "Can't modify %s in %s",
638bc118 1256 (o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL)
22c35a8c
GS		 1257 ? "do block" : PL_op_desc[o->op_type]),
1258 type ? PL_op_desc[type] : "local"));
11343788 1259 return o;
79072805 1260
a0d0e21e
LW		 1261 case OP_PREINC:
1262 case OP_PREDEC:
1263 case OP_POW:
1264 case OP_MULTIPLY:
1265 case OP_DIVIDE:
1266 case OP_MODULO:
1267 case OP_REPEAT:
1268 case OP_ADD:
1269 case OP_SUBTRACT:
1270 case OP_CONCAT:
1271 case OP_LEFT_SHIFT:
1272 case OP_RIGHT_SHIFT:
1273 case OP_BIT_AND:
1274 case OP_BIT_XOR:
1275 case OP_BIT_OR:
1276 case OP_I_MULTIPLY:
1277 case OP_I_DIVIDE:
1278 case OP_I_MODULO:
1279 case OP_I_ADD:
1280 case OP_I_SUBTRACT:
11343788 1281 if (!(o->op_flags & OPf_STACKED))
a0d0e21e 1282 goto nomod;
3280af22 1283 PL_modcount++;
a0d0e21e
LW		 1284 break;
1285
79072805 1286 case OP_COND_EXPR:
11343788 1287 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1288 mod(kid, type);
79072805
LW		 1289 break;
1290
1291 case OP_RV2AV:
1292 case OP_RV2HV:
93af7a87 1293 if (!type && cUNOPo->op_first->op_type != OP_GV)
cea2e8a9 1294 Perl_croak(aTHX_ "Can't localize through a reference");
11343788 1295 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
3280af22 1296 PL_modcount = 10000;
11343788 1297 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1298 }
1299 /* FALL THROUGH */
79072805 1300 case OP_RV2GV:
5dc0d613 1301 if (scalar_mod_type(o, type))
3fe9a6f1 1302 goto nomod;
11343788 1303 ref(cUNOPo->op_first, o->op_type);
79072805
LW		 1304 /* FALL THROUGH */
1305 case OP_AASSIGN:
1306 case OP_ASLICE:
1307 case OP_HSLICE:
93a17b20
LW		 1308 case OP_NEXTSTATE:
1309 case OP_DBSTATE:
a0d0e21e
LW		 1310 case OP_REFGEN:
1311 case OP_CHOMP:
3280af22 1312 PL_modcount = 10000;
79072805 1313 break;
463ee0b2 1314 case OP_RV2SV:
11343788 1315 if (!type && cUNOPo->op_first->op_type != OP_GV)
cea2e8a9 1316 Perl_croak(aTHX_ "Can't localize through a reference");
aeea060c 1317 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1318 /* FALL THROUGH */
79072805 1319 case OP_GV:
463ee0b2 1320 case OP_AV2ARYLEN:
3280af22 1321 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1322 case OP_SASSIGN:
bf4b1e52
GS		 1323 case OP_ANDASSIGN:
1324 case OP_ORASSIGN:
8990e307 1325 case OP_AELEMFAST:
3280af22 1326 PL_modcount++;
8990e307
LW		 1327 break;
1328
748a9306
LW		 1329 case OP_PADAV:
1330 case OP_PADHV:
3280af22 1331 PL_modcount = 10000;
5196be3e
MB		 1332 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1333 return o; /* Treat \(@foo) like ordinary list. */
1334 if (scalar_mod_type(o, type))
3fe9a6f1 1335 goto nomod;
748a9306
LW		 1336 /* FALL THROUGH */
1337 case OP_PADSV:
3280af22 1338 PL_modcount++;
748a9306 1339 if (!type)
cea2e8a9 1340 Perl_croak(aTHX_ "Can't localize lexical variable %s",
2d8e6c8d 1341 SvPV(*av_fetch(PL_comppad_name, o->op_targ, 4), n_a));
463ee0b2
LW		 1342 break;
1343
554b3eca 1344#ifdef USE_THREADS
2faa37cc 1345 case OP_THREADSV:
533c011a 1346 PL_modcount++; /* XXX ??? */
554b3eca
MB		 1347 break;
1348#endif /* USE_THREADS */
1349
748a9306
LW		 1350 case OP_PUSHMARK:
1351 break;
a0d0e21e 1352
69969c6f
SB		 1353 case OP_KEYS:
1354 if (type != OP_SASSIGN)
1355 goto nomod;
5d82c453
GA		 1356 goto lvalue_func;
1357 case OP_SUBSTR:
1358 if (o->op_private == 4) /* don't allow 4 arg substr as lvalue */
1359 goto nomod;
5f05dabc 1360 /* FALL THROUGH */
a0d0e21e 1361 case OP_POS:
463ee0b2 1362 case OP_VEC:
5d82c453 1363 lvalue_func:
11343788
MB		 1364 pad_free(o->op_targ);
1365 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1366 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1367 if (o->op_flags & OPf_KIDS)
1368 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1369 break;
a0d0e21e 1370
463ee0b2
LW		 1371 case OP_AELEM:
1372 case OP_HELEM:
11343788 1373 ref(cBINOPo->op_first, o->op_type);
68dc0745 1374 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1375 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1376 o->op_private |= OPpLVAL_DEFER;
3280af22 1377 PL_modcount++;
463ee0b2
LW		 1378 break;
1379
1380 case OP_SCOPE:
1381 case OP_LEAVE:
1382 case OP_ENTER:
11343788
MB		 1383 if (o->op_flags & OPf_KIDS)
1384 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1385 break;
1386
1387 case OP_NULL:
638bc118
GS		 1388 if (o->op_flags & OPf_SPECIAL) /* do BLOCK */
1389 goto nomod;
1390 else if (!(o->op_flags & OPf_KIDS))
463ee0b2 1391 break;
11343788
MB		 1392 if (o->op_targ != OP_LIST) {
1393 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1394 break;
1395 }
1396 /* FALL THROUGH */
463ee0b2 1397 case OP_LIST:
11343788 1398 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1399 mod(kid, type);
1400 break;
1401 }
11343788 1402 o->op_flags |= OPf_MOD;
a0d0e21e
LW		 1403
1404 if (type == OP_AASSIGN || type == OP_SASSIGN)
11343788 1405 o->op_flags |= OPf_SPECIAL|OPf_REF;
a0d0e21e 1406 else if (!type) {
11343788
MB		 1407 o->op_private |= OPpLVAL_INTRO;
1408 o->op_flags &= ~OPf_SPECIAL;
3280af22 1409 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1410 }
a0d0e21e 1411 else if (type != OP_GREPSTART && type != OP_ENTERSUB)
11343788
MB		 1412 o->op_flags |= OPf_REF;
1413 return o;
463ee0b2
LW		 1414}
1415
864dbfa3 1416STATIC bool
cea2e8a9 1417S_scalar_mod_type(pTHX_ OP *o, I32 type)
3fe9a6f1 1418{
1419 switch (type) {
1420 case OP_SASSIGN:
5196be3e 1421 if (o->op_type == OP_RV2GV)
3fe9a6f1 1422 return FALSE;
1423 /* FALL THROUGH */
1424 case OP_PREINC:
1425 case OP_PREDEC:
1426 case OP_POSTINC:
1427 case OP_POSTDEC:
1428 case OP_I_PREINC:
1429 case OP_I_PREDEC:
1430 case OP_I_POSTINC:
1431 case OP_I_POSTDEC:
1432 case OP_POW:
1433 case OP_MULTIPLY:
1434 case OP_DIVIDE:
1435 case OP_MODULO:
1436 case OP_REPEAT:
1437 case OP_ADD:
1438 case OP_SUBTRACT:
1439 case OP_I_MULTIPLY:
1440 case OP_I_DIVIDE:
1441 case OP_I_MODULO:
1442 case OP_I_ADD:
1443 case OP_I_SUBTRACT:
1444 case OP_LEFT_SHIFT:
1445 case OP_RIGHT_SHIFT:
1446 case OP_BIT_AND:
1447 case OP_BIT_XOR:
1448 case OP_BIT_OR:
1449 case OP_CONCAT:
1450 case OP_SUBST:
1451 case OP_TRANS:
49e9fbe6
GS		 1452 case OP_READ:
1453 case OP_SYSREAD:
1454 case OP_RECV:
bf4b1e52
GS		 1455 case OP_ANDASSIGN:
1456 case OP_ORASSIGN:
3fe9a6f1 1457 return TRUE;
1458 default:
1459 return FALSE;
1460 }
1461}
1462
35cd451c 1463STATIC bool
cea2e8a9 1464S_is_handle_constructor(pTHX_ OP *o, I32 argnum)
35cd451c
GS		 1465{
1466 switch (o->op_type) {
1467 case OP_PIPE_OP:
1468 case OP_SOCKPAIR:
1469 if (argnum == 2)
1470 return TRUE;
1471 /* FALL THROUGH */
1472 case OP_SYSOPEN:
1473 case OP_OPEN:
ded8aa31 1474 case OP_SELECT: /* XXX c.f. SelectSaver.pm */
35cd451c
GS		 1475 case OP_SOCKET:
1476 case OP_OPEN_DIR:
1477 case OP_ACCEPT:
1478 if (argnum == 1)
1479 return TRUE;
1480 /* FALL THROUGH */
1481 default:
1482 return FALSE;
1483 }
1484}
1485
463ee0b2 1486OP *
864dbfa3 1487Perl_refkids(pTHX_ OP *o, I32 type)
463ee0b2
LW		 1488{
1489 OP *kid;
11343788
MB		 1490 if (o && o->op_flags & OPf_KIDS) {
1491 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1492 ref(kid, type);
1493 }
11343788 1494 return o;
463ee0b2
LW		 1495}
1496
1497OP *
864dbfa3 1498Perl_ref(pTHX_ OP *o, I32 type)
463ee0b2
LW		 1499{
1500 OP *kid;
463ee0b2 1501
3280af22 1502 if (!o || PL_error_count)
11343788 1503 return o;
463ee0b2 1504
11343788 1505 switch (o->op_type) {
a0d0e21e 1506 case OP_ENTERSUB:
e55aaa0e 1507 if ((type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1508 !(o->op_flags & OPf_STACKED)) {
1509 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1510 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788
MB		 1511 assert(cUNOPo->op_first->op_type == OP_NULL);
1512 null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
1513 o->op_flags |= OPf_SPECIAL;
8990e307
LW		 1514 }
1515 break;
aeea060c 1516
463ee0b2 1517 case OP_COND_EXPR:
11343788 1518 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2
LW		 1519 ref(kid, type);
1520 break;
8990e307 1521 case OP_RV2SV:
35cd451c
GS		 1522 if (type == OP_DEFINED)
1523 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1524 ref(cUNOPo->op_first, o->op_type);
4633a7c4
LW		 1525 /* FALL THROUGH */
1526 case OP_PADSV:
5f05dabc 1527 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1528 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1529 : type == OP_RV2HV ? OPpDEREF_HV
1530 : OPpDEREF_SV);
11343788 1531 o->op_flags |= OPf_MOD;
a0d0e21e 1532 }
8990e307
LW		 1533 break;
1534
2faa37cc 1535 case OP_THREADSV:
a863c7d1
MB		 1536 o->op_flags |= OPf_MOD; /* XXX ??? */
1537 break;
1538
463ee0b2
LW		 1539 case OP_RV2AV:
1540 case OP_RV2HV:
aeea060c 1541 o->op_flags |= OPf_REF;
8990e307 1542 /* FALL THROUGH */
463ee0b2 1543 case OP_RV2GV:
35cd451c
GS		 1544 if (type == OP_DEFINED)
1545 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1546 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1547 break;
8990e307 1548
463ee0b2
LW		 1549 case OP_PADAV:
1550 case OP_PADHV:
aeea060c 1551 o->op_flags |= OPf_REF;
79072805 1552 break;
aeea060c 1553
8990e307 1554 case OP_SCALAR:
79072805 1555 case OP_NULL:
11343788 1556 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1557 break;
11343788 1558 ref(cBINOPo->op_first, type);
79072805
LW		 1559 break;
1560 case OP_AELEM:
1561 case OP_HELEM:
11343788 1562 ref(cBINOPo->op_first, o->op_type);
5f05dabc 1563 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1564 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1565 : type == OP_RV2HV ? OPpDEREF_HV
1566 : OPpDEREF_SV);
11343788 1567 o->op_flags |= OPf_MOD;
8990e307 1568 }
79072805
LW		 1569 break;
1570
463ee0b2 1571 case OP_SCOPE:
79072805
LW		 1572 case OP_LEAVE:
1573 case OP_ENTER:
8990e307 1574 case OP_LIST:
11343788 1575 if (!(o->op_flags & OPf_KIDS))
79072805 1576 break;
11343788 1577 ref(cLISTOPo->op_last, type);
79072805 1578 break;
a0d0e21e
LW		 1579 default:
1580 break;
79072805 1581 }
11343788 1582 return scalar(o);
8990e307 1583
79072805
LW		 1584}
1585
1586OP *
864dbfa3 1587Perl_my(pTHX_ OP *o)
93a17b20
LW		 1588{
1589 OP *kid;
93a17b20
LW		 1590 I32 type;
1591
3280af22 1592 if (!o || PL_error_count)
11343788 1593 return o;
93a17b20 1594
11343788 1595 type = o->op_type;
93a17b20 1596 if (type == OP_LIST) {
11343788 1597 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
93a17b20 1598 my(kid);
dab48698 1599 } else if (type == OP_UNDEF) {
7766148a 1600 return o;
dab48698 1601 } else if (type != OP_PADSV &&
93a17b20
LW		 1602 type != OP_PADAV &&
1603 type != OP_PADHV &&
1604 type != OP_PUSHMARK)
1605 {
cea2e8a9 1606 yyerror(Perl_form(aTHX_ "Can't declare %s in my", PL_op_desc[o->op_type]));
11343788 1607 return o;
93a17b20 1608 }
11343788
MB		 1609 o->op_flags |= OPf_MOD;
1610 o->op_private |= OPpLVAL_INTRO;
1611 return o;
93a17b20
LW		 1612}
1613
1614OP *
864dbfa3 1615Perl_sawparens(pTHX_ OP *o)
79072805
LW		 1616{
1617 if (o)
1618 o->op_flags |= OPf_PARENS;
1619 return o;
1620}
1621
1622OP *
864dbfa3 1623Perl_bind_match(pTHX_ I32 type, OP *left, OP *right)
79072805 1624{
d008e5eb 1625 dTHR;
11343788 1626 OP *o;
79072805 1627
599cee73
PM		 1628 if (ckWARN(WARN_UNSAFE) &&
1629 (left->op_type == OP_RV2AV ||
1630 left->op_type == OP_RV2HV ||
1631 left->op_type == OP_PADAV ||
1632 left->op_type == OP_PADHV)) {
22c35a8c 1633 char *desc = PL_op_desc[(right->op_type == OP_SUBST ||
599cee73
PM		 1634 right->op_type == OP_TRANS)
1635 ? right->op_type : OP_MATCH];
1636 char *sample = ((left->op_type == OP_RV2AV ||
1637 left->op_type == OP_PADAV)
1638 ? "@array" : "%hash");
cea2e8a9 1639 Perl_warner(aTHX_ WARN_UNSAFE,
599cee73
PM		 1640 "Applying %s to %s will act on scalar(%s)",
1641 desc, sample, sample);
2ae324a7 1642 }
1643
79072805
LW		 1644 if (right->op_type == OP_MATCH ||
1645 right->op_type == OP_SUBST ||
1646 right->op_type == OP_TRANS) {
1647 right->op_flags |= OPf_STACKED;
1648 if (right->op_type != OP_MATCH)
463ee0b2 1649 left = mod(left, right->op_type);
79072805 1650 if (right->op_type == OP_TRANS)
11343788 1651 o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805 1652 else
11343788 1653 o = prepend_elem(right->op_type, scalar(left), right);
79072805 1654 if (type == OP_NOT)
11343788
MB		 1655 return newUNOP(OP_NOT, 0, scalar(o));
1656 return o;
79072805
LW		 1657 }
1658 else
1659 return bind_match(type, left,
1660 pmruntime(newPMOP(OP_MATCH, 0), right, Nullop));
1661}
1662
1663OP *
864dbfa3 1664Perl_invert(pTHX_ OP *o)
79072805 1665{
11343788
MB		 1666 if (!o)
1667 return o;
79072805 1668 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
11343788 1669 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1670}
1671
1672OP *
864dbfa3 1673Perl_scope(pTHX_ OP *o)
79072805
LW		 1674{
1675 if (o) {
3280af22 1676 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || PL_tainting) {
463ee0b2
LW		 1677 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1678 o->op_type = OP_LEAVE;
22c35a8c 1679 o->op_ppaddr = PL_ppaddr[OP_LEAVE];
463ee0b2
LW		 1680 }
1681 else {
1682 if (o->op_type == OP_LINESEQ) {
1683 OP *kid;
1684 o->op_type = OP_SCOPE;
22c35a8c 1685 o->op_ppaddr = PL_ppaddr[OP_SCOPE];
463ee0b2 1686 kid = ((LISTOP*)o)->op_first;
748a9306 1687 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE){
3eb57f73 1688 cop_free((COP*)kid);
8990e307 1689 null(kid);
748a9306 1690 }
463ee0b2
LW		 1691 }
1692 else
748a9306 1693 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
463ee0b2 1694 }
79072805
LW		 1695 }
1696 return o;
1697}
1698
b3ac6de7 1699void
864dbfa3 1700Perl_save_hints(pTHX)
b3ac6de7 1701{
3280af22
NIS		 1702 SAVEI32(PL_hints);
1703 SAVESPTR(GvHV(PL_hintgv));
1704 GvHV(PL_hintgv) = newHVhv(GvHV(PL_hintgv));
1705 SAVEFREESV(GvHV(PL_hintgv));
b3ac6de7
IZ		 1706}
1707
a0d0e21e 1708int
864dbfa3 1709Perl_block_start(pTHX_ int full)
79072805 1710{
11343788 1711 dTHR;
3280af22 1712 int retval = PL_savestack_ix;
b3ac6de7 1713
3280af22 1714 SAVEI32(PL_comppad_name_floor);
55497cff 1715 if (full) {
3280af22
NIS		 1716 if ((PL_comppad_name_fill = AvFILLp(PL_comppad_name)) > 0)
1717 PL_comppad_name_floor = PL_comppad_name_fill;
55497cff 1718 else
3280af22
NIS		 1719 PL_comppad_name_floor = 0;
1720 }
1721 SAVEI32(PL_min_intro_pending);
1722 SAVEI32(PL_max_intro_pending);
1723 PL_min_intro_pending = 0;
1724 SAVEI32(PL_comppad_name_fill);
1725 SAVEI32(PL_padix_floor);
1726 PL_padix_floor = PL_padix;
1727 PL_pad_reset_pending = FALSE;
b3ac6de7 1728 SAVEHINTS();
3280af22 1729 PL_hints &= ~HINT_BLOCK_SCOPE;
e24b16f9 1730 SAVEPPTR(PL_compiling.cop_warnings);
0453d815 1731 if (! specialWARN(PL_compiling.cop_warnings)) {
599cee73
PM		 1732 PL_compiling.cop_warnings = newSVsv(PL_compiling.cop_warnings) ;
1733 SAVEFREESV(PL_compiling.cop_warnings) ;
1734 }
1735
1736
a0d0e21e
LW		 1737 return retval;
1738}
1739
1740OP*
864dbfa3 1741Perl_block_end(pTHX_ I32 floor, OP *seq)
a0d0e21e 1742{
11343788 1743 dTHR;
3280af22 1744 int needblockscope = PL_hints & HINT_BLOCK_SCOPE;
a0d0e21e 1745 OP* retval = scalarseq(seq);
a0d0e21e 1746 LEAVE_SCOPE(floor);
3280af22 1747 PL_pad_reset_pending = FALSE;
e24b16f9 1748 PL_compiling.op_private = PL_hints;
a0d0e21e 1749 if (needblockscope)
3280af22
NIS		 1750 PL_hints |= HINT_BLOCK_SCOPE; /* propagate out */
1751 pad_leavemy(PL_comppad_name_fill);
1752 PL_cop_seqmax++;
a0d0e21e
LW		 1753 return retval;
1754}
1755
76e3520e 1756STATIC OP *
cea2e8a9 1757S_newDEFSVOP(pTHX)
54b9620d
MB		 1758{
1759#ifdef USE_THREADS
1760 OP *o = newOP(OP_THREADSV, 0);
1761 o->op_targ = find_threadsv("_");
1762 return o;
1763#else
3280af22 1764 return newSVREF(newGVOP(OP_GV, 0, PL_defgv));
54b9620d
MB		 1765#endif /* USE_THREADS */
1766}
1767
a0d0e21e 1768void
864dbfa3 1769Perl_newPROG(pTHX_ OP *o)
a0d0e21e 1770{
11343788 1771 dTHR;
3280af22 1772 if (PL_in_eval) {
b295d113
TH		 1773 if (PL_eval_root)
1774 return;
faef0170
HS		 1775 PL_eval_root = newUNOP(OP_LEAVEEVAL,
1776 ((PL_in_eval & EVAL_KEEPERR)
1777 ? OPf_SPECIAL : 0), o);
3280af22
NIS		 1778 PL_eval_start = linklist(PL_eval_root);
1779 PL_eval_root->op_next = 0;
1780 peep(PL_eval_start);
a0d0e21e
LW		 1781 }
1782 else {
5dc0d613 1783 if (!o)
a0d0e21e 1784 return;
3280af22
NIS		 1785 PL_main_root = scope(sawparens(scalarvoid(o)));
1786 PL_curcop = &PL_compiling;
1787 PL_main_start = LINKLIST(PL_main_root);
1788 PL_main_root->op_next = 0;
1789 peep(PL_main_start);
1790 PL_compcv = 0;
3841441e 1791
4fdae800 1792 /* Register with debugger */
84902520 1793 if (PERLDB_INTER) {
864dbfa3 1794 CV *cv = get_cv("DB::postponed", FALSE);
3841441e
CS		 1795 if (cv) {
1796 dSP;
924508f0 1797 PUSHMARK(SP);
3280af22 1798 XPUSHs((SV*)PL_compiling.cop_filegv);
3841441e 1799 PUTBACK;
864dbfa3 1800 call_sv((SV*)cv, G_DISCARD);
3841441e
CS		 1801 }
1802 }
79072805 1803 }
79072805
LW		 1804}
1805
1806OP *
864dbfa3 1807Perl_localize(pTHX_ OP *o, I32 lex)
79072805
LW		 1808{
1809 if (o->op_flags & OPf_PARENS)
1810 list(o);
8990e307 1811 else {
d008e5eb 1812 dTHR;
599cee73 1813 if (ckWARN(WARN_PARENTHESIS) && PL_bufptr > PL_oldbufptr && PL_bufptr[-1] == ',') {
8990e307 1814 char *s;
834a4ddd 1815 for (s = PL_bufptr; *s && (isALNUM(*s) || (*s & 0x80) || strchr("@$%, ",*s)); s++) ;
a0d0e21e 1816 if (*s == ';' || *s == '=')
cea2e8a9 1817 Perl_warner(aTHX_ WARN_PARENTHESIS, "Parentheses missing around \"%s\" list",
599cee73 1818 lex ? "my" : "local");
8990e307
LW		 1819 }
1820 }
3280af22
NIS		 1821 PL_in_my = FALSE;
1822 PL_in_my_stash = Nullhv;
93a17b20
LW		 1823 if (lex)
1824 return my(o);
1825 else
463ee0b2 1826 return mod(o, OP_NULL); /* a bit kludgey */
79072805
LW		 1827}
1828
1829OP *
864dbfa3 1830Perl_jmaybe(pTHX_ OP *o)
79072805
LW		 1831{
1832 if (o->op_type == OP_LIST) {
554b3eca
MB		 1833 OP *o2;
1834#ifdef USE_THREADS
2faa37cc 1835 o2 = newOP(OP_THREADSV, 0);
54b9620d 1836 o2->op_targ = find_threadsv(";");
554b3eca
MB		 1837#else
1838 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
1839#endif /* USE_THREADS */
1840 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 1841 }
1842 return o;
1843}
1844
1845OP *
864dbfa3 1846Perl_fold_constants(pTHX_ register OP *o)
79072805 1847{
11343788 1848 dTHR;
79072805
LW		 1849 register OP *curop;
1850 I32 type = o->op_type;
748a9306 1851 SV *sv;
79072805 1852
22c35a8c 1853 if (PL_opargs[type] & OA_RETSCALAR)
79072805 1854 scalar(o);
b162f9ea 1855 if (PL_opargs[type] & OA_TARGET && !o->op_targ)
ed6116ce 1856 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 1857
eac055e9
GS		 1858 /* integerize op, unless it happens to be C<-foo>.
1859 * XXX should pp_i_negate() do magic string negation instead? */
1860 if ((PL_opargs[type] & OA_OTHERINT) && (PL_hints & HINT_INTEGER)
1861 && !(type == OP_NEGATE && cUNOPo->op_first->op_type == OP_CONST
1862 && (cUNOPo->op_first->op_private & OPpCONST_BARE)))
1863 {
22c35a8c 1864 o->op_ppaddr = PL_ppaddr[type = ++(o->op_type)];
eac055e9 1865 }
85e6fe83 1866
22c35a8c 1867 if (!(PL_opargs[type] & OA_FOLDCONST))
79072805
LW		 1868 goto nope;
1869
de939608 1870 switch (type) {
7a52d87a
GS		 1871 case OP_NEGATE:
1872 /* XXX might want a ck_negate() for this */
1873 cUNOPo->op_first->op_private &= ~OPpCONST_STRICT;
1874 break;
de939608
CS		 1875 case OP_SPRINTF:
1876 case OP_UCFIRST:
1877 case OP_LCFIRST:
1878 case OP_UC:
1879 case OP_LC:
69dcf70c
MB		 1880 case OP_SLT:
1881 case OP_SGT:
1882 case OP_SLE:
1883 case OP_SGE:
1884 case OP_SCMP:
1885
de939608
CS		 1886 if (o->op_private & OPpLOCALE)
1887 goto nope;
1888 }
1889
3280af22 1890 if (PL_error_count)
a0d0e21e
LW		 1891 goto nope; /* Don't try to run w/ errors */
1892
79072805 1893 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
93a17b20 1894 if (curop->op_type != OP_CONST &&
7a52d87a
GS		 1895 curop->op_type != OP_LIST &&
1896 curop->op_type != OP_SCALAR &&
1897 curop->op_type != OP_NULL &&
1898 curop->op_type != OP_PUSHMARK)
1899 {
79072805
LW		 1900 goto nope;
1901 }
1902 }
1903
1904 curop = LINKLIST(o);
1905 o->op_next = 0;
533c011a 1906 PL_op = curop;
cea2e8a9 1907 CALLRUNOPS(aTHX);
3280af22 1908 sv = *(PL_stack_sp--);
748a9306 1909 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
79072805 1910 pad_swipe(o->op_targ);
748a9306
LW		 1911 else if (SvTEMP(sv)) { /* grab mortal temp? */
1912 (void)SvREFCNT_inc(sv);
1913 SvTEMP_off(sv);
85e6fe83 1914 }
79072805
LW		 1915 op_free(o);
1916 if (type == OP_RV2GV)
b1cb66bf 1917 return newGVOP(OP_GV, 0, (GV*)sv);
748a9306 1918 else {
ee580363
GS		 1919 /* try to smush double to int, but don't smush -2.0 to -2 */
1920 if ((SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK)) == SVf_NOK &&
1921 type != OP_NEGATE)
1922 {
748a9306 1923 IV iv = SvIV(sv);
65202027 1924 if ((NV)iv == SvNV(sv)) {
748a9306
LW		 1925 SvREFCNT_dec(sv);
1926 sv = newSViv(iv);
1927 }
b1cb66bf 1928 else
1929 SvIOK_off(sv); /* undo SvIV() damage */
748a9306
LW		 1930 }
1931 return newSVOP(OP_CONST, 0, sv);
1932 }
aeea060c 1933
79072805 1934 nope:
22c35a8c 1935 if (!(PL_opargs[type] & OA_OTHERINT))
79072805 1936 return o;
79072805 1937
3280af22 1938 if (!(PL_hints & HINT_INTEGER)) {
a0d0e21e 1939 if (type == OP_DIVIDE || !(o->op_flags & OPf_KIDS))
85e6fe83
LW		 1940 return o;
1941
1942 for (curop = ((UNOP*)o)->op_first; curop; curop = curop->op_sibling) {
1943 if (curop->op_type == OP_CONST) {
b1cb66bf 1944 if (SvIOK(((SVOP*)curop)->op_sv))
85e6fe83
LW		 1945 continue;
1946 return o;
1947 }
22c35a8c 1948 if (PL_opargs[curop->op_type] & OA_RETINTEGER)
79072805
LW		 1949 continue;
1950 return o;
1951 }
22c35a8c 1952 o->op_ppaddr = PL_ppaddr[++(o->op_type)];
79072805
LW		 1953 }
1954
79072805
LW		 1955 return o;
1956}
1957
1958OP *
864dbfa3 1959Perl_gen_constant_list(pTHX_ register OP *o)
79072805 1960{
11343788 1961 dTHR;
79072805 1962 register OP *curop;
3280af22 1963 I32 oldtmps_floor = PL_tmps_floor;
79072805 1964
a0d0e21e 1965 list(o);
3280af22 1966 if (PL_error_count)
a0d0e21e
LW		 1967 return o; /* Don't attempt to run with errors */
1968
533c011a 1969 PL_op = curop = LINKLIST(o);
a0d0e21e 1970 o->op_next = 0;
cea2e8a9
GS		 1971 pp_pushmark();
1972 CALLRUNOPS(aTHX);
533c011a 1973 PL_op = curop;
cea2e8a9 1974 pp_anonlist();
3280af22 1975 PL_tmps_floor = oldtmps_floor;
79072805
LW		 1976
1977 o->op_type = OP_RV2AV;
22c35a8c 1978 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
79072805 1979 curop = ((UNOP*)o)->op_first;
3280af22 1980 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*PL_stack_sp--));
79072805 1981 op_free(curop);
79072805
LW		 1982 linklist(o);
1983 return list(o);
1984}
1985
1986OP *
864dbfa3 1987Perl_convert(pTHX_ I32 type, I32 flags, OP *o)
79072805
LW		 1988{
1989 OP *kid;
a0d0e21e 1990 OP *last = 0;
79072805 1991
11343788
MB		 1992 if (!o || o->op_type != OP_LIST)
1993 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 1994 else
5dc0d613 1995 o->op_flags &= ~OPf_WANT;
79072805 1996
22c35a8c 1997 if (!(PL_opargs[type] & OA_MARK))
11343788 1998 null(cLISTOPo->op_first);
8990e307 1999
11343788 2000 o->op_type = type;
22c35a8c 2001 o->op_ppaddr = PL_ppaddr[type];
11343788 2002 o->op_flags |= flags;
79072805 2003
11343788
MB		 2004 o = CHECKOP(type, o);
2005 if (o->op_type != type)
2006 return o;
79072805 2007
11343788 2008 if (cLISTOPo->op_children < 7) {
79072805 2009 /* XXX do we really need to do this if we're done appending?? */
11343788 2010 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805 2011 last = kid;
11343788 2012 cLISTOPo->op_last = last; /* in case check substituted last arg */
79072805
LW		 2013 }
2014
11343788 2015 return fold_constants(o);
79072805
LW		 2016}
2017
2018/* List constructors */
2019
2020OP *
864dbfa3 2021Perl_append_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2022{
2023 if (!first)
2024 return last;
8990e307
LW		 2025
2026 if (!last)
79072805 2027 return first;
8990e307 2028
a0d0e21e
LW		 2029 if (first->op_type != type || type==OP_LIST && first->op_flags & OPf_PARENS)
2030 return newLISTOP(type, 0, first, last);
79072805 2031
a0d0e21e
LW		 2032 if (first->op_flags & OPf_KIDS)
2033 ((LISTOP*)first)->op_last->op_sibling = last;
2034 else {
2035 first->op_flags |= OPf_KIDS;
2036 ((LISTOP*)first)->op_first = last;
2037 }
2038 ((LISTOP*)first)->op_last = last;
2039 ((LISTOP*)first)->op_children++;
2040 return first;
79072805
LW		 2041}
2042
2043OP *
864dbfa3 2044Perl_append_list(pTHX_ I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 2045{
2046 if (!first)
2047 return (OP*)last;
8990e307
LW		 2048
2049 if (!last)
79072805 2050 return (OP*)first;
8990e307
LW		 2051
2052 if (first->op_type != type)
79072805 2053 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307
LW		 2054
2055 if (last->op_type != type)
79072805
LW		 2056 return append_elem(type, (OP*)first, (OP*)last);
2057
2058 first->op_last->op_sibling = last->op_first;
2059 first->op_last = last->op_last;
2060 first->op_children += last->op_children;
2061 if (first->op_children)
acb74605 2062 first->op_flags |= OPf_KIDS;
b7dc083c
NIS		 2063
2064#ifdef PL_OP_SLAB_ALLOC
2065#else
2066 Safefree(last);
2067#endif
79072805
LW		 2068 return (OP*)first;
2069}
2070
2071OP *
864dbfa3 2072Perl_prepend_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2073{
2074 if (!first)
2075 return last;
8990e307
LW		 2076
2077 if (!last)
79072805 2078 return first;
8990e307
LW		 2079
2080 if (last->op_type == type) {
2081 if (type == OP_LIST) { /* already a PUSHMARK there */
2082 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
2083 ((LISTOP*)last)->op_first->op_sibling = first;
2084 }
2085 else {
2086 if (!(last->op_flags & OPf_KIDS)) {
2087 ((LISTOP*)last)->op_last = first;
2088 last->op_flags |= OPf_KIDS;
2089 }
2090 first->op_sibling = ((LISTOP*)last)->op_first;
2091 ((LISTOP*)last)->op_first = first;
79072805 2092 }
79072805
LW		 2093 ((LISTOP*)last)->op_children++;
2094 return last;
2095 }
2096
2097 return newLISTOP(type, 0, first, last);
2098}
2099
2100/* Constructors */
2101
2102OP *
864dbfa3 2103Perl_newNULLLIST(pTHX)
79072805 2104{
8990e307
LW		 2105 return newOP(OP_STUB, 0);
2106}
2107
2108OP *
864dbfa3 2109Perl_force_list(pTHX_ OP *o)
8990e307 2110{
11343788
MB		 2111 if (!o || o->op_type != OP_LIST)
2112 o = newLISTOP(OP_LIST, 0, o, Nullop);
2113 null(o);
2114 return o;
79072805
LW		 2115}
2116
2117OP *
864dbfa3 2118Perl_newLISTOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2119{
2120 LISTOP *listop;
2121
b7dc083c 2122 NewOp(1101, listop, 1, LISTOP);
79072805
LW		 2123
2124 listop->op_type = type;
22c35a8c 2125 listop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2126 listop->op_children = (first != 0) + (last != 0);
2127 listop->op_flags = flags;
79072805
LW		 2128
2129 if (!last && first)
2130 last = first;
2131 else if (!first && last)
2132 first = last;
8990e307
LW		 2133 else if (first)
2134 first->op_sibling = last;
79072805
LW		 2135 listop->op_first = first;
2136 listop->op_last = last;
8990e307
LW		 2137 if (type == OP_LIST) {
2138 OP* pushop;
2139 pushop = newOP(OP_PUSHMARK, 0);
2140 pushop->op_sibling = first;
2141 listop->op_first = pushop;
2142 listop->op_flags |= OPf_KIDS;
2143 if (!last)
2144 listop->op_last = pushop;
2145 }
2146 else if (listop->op_children)
2147 listop->op_flags |= OPf_KIDS;
79072805
LW		 2148
2149 return (OP*)listop;
2150}
2151
2152OP *
864dbfa3 2153Perl_newOP(pTHX_ I32 type, I32 flags)
79072805 2154{
11343788 2155 OP *o;
b7dc083c 2156 NewOp(1101, o, 1, OP);
11343788 2157 o->op_type = type;
22c35a8c 2158 o->op_ppaddr = PL_ppaddr[type];
11343788 2159 o->op_flags = flags;
79072805 2160
11343788
MB		 2161 o->op_next = o;
2162 o->op_private = 0 + (flags >> 8);
22c35a8c 2163 if (PL_opargs[type] & OA_RETSCALAR)
11343788 2164 scalar(o);
22c35a8c 2165 if (PL_opargs[type] & OA_TARGET)
11343788
MB		 2166 o->op_targ = pad_alloc(type, SVs_PADTMP);
2167 return CHECKOP(type, o);
79072805
LW		 2168}
2169
2170OP *
864dbfa3 2171Perl_newUNOP(pTHX_ I32 type, I32 flags, OP *first)
79072805
LW		 2172{
2173 UNOP *unop;
2174
93a17b20 2175 if (!first)
aeea060c 2176 first = newOP(OP_STUB, 0);
22c35a8c 2177 if (PL_opargs[type] & OA_MARK)
8990e307 2178 first = force_list(first);
93a17b20 2179
b7dc083c 2180 NewOp(1101, unop, 1, UNOP);
79072805 2181 unop->op_type = type;
22c35a8c 2182 unop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2183 unop->op_first = first;
2184 unop->op_flags = flags | OPf_KIDS;
c07a80fd 2185 unop->op_private = 1 | (flags >> 8);
e50aee73 2186 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 2187 if (unop->op_next)
2188 return (OP*)unop;
2189
a0d0e21e 2190 return fold_constants((OP *) unop);
79072805
LW		 2191}
2192
2193OP *
864dbfa3 2194Perl_newBINOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2195{
2196 BINOP *binop;
b7dc083c 2197 NewOp(1101, binop, 1, BINOP);
79072805
LW		 2198
2199 if (!first)
2200 first = newOP(OP_NULL, 0);
2201
2202 binop->op_type = type;
22c35a8c 2203 binop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2204 binop->op_first = first;
2205 binop->op_flags = flags | OPf_KIDS;
2206 if (!last) {
2207 last = first;
c07a80fd 2208 binop->op_private = 1 | (flags >> 8);
79072805
LW		 2209 }
2210 else {
c07a80fd 2211 binop->op_private = 2 | (flags >> 8);
79072805
LW		 2212 first->op_sibling = last;
2213 }
2214
e50aee73 2215 binop = (BINOP*)CHECKOP(type, binop);
b162f9ea 2216 if (binop->op_next || binop->op_type != type)
79072805
LW		 2217 return (OP*)binop;
2218
7284ab6f 2219 binop->op_last = binop->op_first->op_sibling;
79072805 2220
a0d0e21e 2221 return fold_constants((OP *)binop);
79072805
LW		 2222}
2223
a0ed51b3
LW		 2224static int
2225utf8compare(const void *a, const void *b)
2226{
2227 int i;
2228 for (i = 0; i < 10; i++) {
2229 if ((*(U8**)a)[i] < (*(U8**)b)[i])
2230 return -1;
2231 if ((*(U8**)a)[i] > (*(U8**)b)[i])
2232 return 1;
2233 }
2234 return 0;
2235}
2236
79072805 2237OP *
864dbfa3 2238Perl_pmtrans(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2239{
79072805
LW		 2240 SV *tstr = ((SVOP*)expr)->op_sv;
2241 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 2242 STRLEN tlen;
2243 STRLEN rlen;
ec49126f 2244 register U8 *t = (U8*)SvPV(tstr, tlen);
2245 register U8 *r = (U8*)SvPV(rstr, rlen);
79072805
LW		 2246 register I32 i;
2247 register I32 j;
a0ed51b3 2248 I32 del;
79072805 2249 I32 complement;
5d06d08e 2250 I32 squash;
79072805
LW		 2251 register short *tbl;
2252
11343788 2253 complement = o->op_private & OPpTRANS_COMPLEMENT;
a0ed51b3 2254 del = o->op_private & OPpTRANS_DELETE;
5d06d08e 2255 squash = o->op_private & OPpTRANS_SQUASH;
79072805 2256
a0ed51b3 2257 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
79cb57f6 2258 SV* listsv = newSVpvn("# comment\n",10);
a0ed51b3
LW		 2259 SV* transv = 0;
2260 U8* tend = t + tlen;
2261 U8* rend = r + rlen;
2262 I32 ulen;
2263 U32 tfirst = 1;
2264 U32 tlast = 0;
2265 I32 tdiff;
2266 U32 rfirst = 1;
2267 U32 rlast = 0;
2268 I32 rdiff;
2269 I32 diff;
2270 I32 none = 0;
2271 U32 max = 0;
2272 I32 bits;
2273 I32 grows = 0;
2274 I32 havefinal = 0;
2275 U32 final;
2276 HV *hv;
2277 I32 from_utf = o->op_private & OPpTRANS_FROM_UTF;
2278 I32 to_utf = o->op_private & OPpTRANS_TO_UTF;
2279
2280 if (complement) {
2281 U8 tmpbuf[10];
2282 U8** cp;
2283 UV nextmin = 0;
2284 New(1109, cp, tlen, U8*);
2285 i = 0;
79cb57f6 2286 transv = newSVpvn("",0);
a0ed51b3
LW		 2287 while (t < tend) {
2288 cp[i++] = t;
2289 t += UTF8SKIP(t);
2290 if (*t == 0xff) {
2291 t++;
2292 t += UTF8SKIP(t);
2293 }
2294 }
2295 qsort(cp, i, sizeof(U8*), utf8compare);
2296 for (j = 0; j < i; j++) {
2297 U8 *s = cp[j];
2298 UV val = utf8_to_uv(s, &ulen);
2299 s += ulen;
2300 diff = val - nextmin;
2301 if (diff > 0) {
2302 t = uv_to_utf8(tmpbuf,nextmin);
dfe13c55 2303 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2304 if (diff > 1) {
2305 t = uv_to_utf8(tmpbuf, val - 1);
2306 sv_catpvn(transv, "\377", 1);
dfe13c55 2307 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2308 }
2309 }
2310 if (*s == 0xff)
2311 val = utf8_to_uv(s+1, &ulen);
2312 if (val >= nextmin)
2313 nextmin = val + 1;
2314 }
2315 t = uv_to_utf8(tmpbuf,nextmin);
dfe13c55 2316 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2317 t = uv_to_utf8(tmpbuf, 0x7fffffff);
2318 sv_catpvn(transv, "\377", 1);
dfe13c55
GS		 2319 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
2320 t = (U8*)SvPVX(transv);
a0ed51b3
LW		 2321 tlen = SvCUR(transv);
2322 tend = t + tlen;
2323 }
2324 else if (!rlen && !del) {
2325 r = t; rlen = tlen; rend = tend;
4757a243
LW		 2326 }
2327 if (!squash) {
2328 if (to_utf && from_utf) { /* only counting characters */
2329 if (t == r || (tlen == rlen && memEQ(t, r, tlen)))
2330 o->op_private |= OPpTRANS_IDENTICAL;
2331 }
2332 else { /* straight latin-1 translation */
2333 if (tlen == 4 && memEQ(t, "\0\377\303\277", 4) &&
2334 rlen == 4 && memEQ(r, "\0\377\303\277", 4))
2335 o->op_private |= OPpTRANS_IDENTICAL;
2336 }
a0ed51b3
LW		 2337 }
2338
2339 while (t < tend || tfirst <= tlast) {
2340 /* see if we need more "t" chars */
2341 if (tfirst > tlast) {
2342 tfirst = (I32)utf8_to_uv(t, &ulen);
2343 t += ulen;
2344 if (t < tend && *t == 0xff) { /* illegal utf8 val indicates range */
2345 tlast = (I32)utf8_to_uv(++t, &ulen);
2346 t += ulen;
2347 }
2348 else
2349 tlast = tfirst;
2350 }
2351
2352 /* now see if we need more "r" chars */
2353 if (rfirst > rlast) {
2354 if (r < rend) {
2355 rfirst = (I32)utf8_to_uv(r, &ulen);
2356 r += ulen;
2357 if (r < rend && *r == 0xff) { /* illegal utf8 val indicates range */
2358 rlast = (I32)utf8_to_uv(++r, &ulen);
2359 r += ulen;
2360 }
2361 else
2362 rlast = rfirst;
2363 }
2364 else {
2365 if (!havefinal++)
2366 final = rlast;
2367 rfirst = rlast = 0xffffffff;
2368 }
2369 }
2370
2371 /* now see which range will peter our first, if either. */
2372 tdiff = tlast - tfirst;
2373 rdiff = rlast - rfirst;
2374
2375 if (tdiff <= rdiff)
2376 diff = tdiff;
2377 else
2378 diff = rdiff;
2379
2380 if (rfirst == 0xffffffff) {
2381 diff = tdiff; /* oops, pretend rdiff is infinite */
2382 if (diff > 0)
cea2e8a9 2383 Perl_sv_catpvf(aTHX_ listsv, "%04x\t%04x\tXXXX\n", tfirst, tlast);
a0ed51b3 2384 else
cea2e8a9 2385 Perl_sv_catpvf(aTHX_ listsv, "%04x\t\tXXXX\n", tfirst);
a0ed51b3
LW		 2386 }
2387 else {
2388 if (diff > 0)
cea2e8a9 2389 Perl_sv_catpvf(aTHX_ listsv, "%04x\t%04x\t%04x\n", tfirst, tfirst + diff, rfirst);
a0ed51b3 2390 else
cea2e8a9 2391 Perl_sv_catpvf(aTHX_ listsv, "%04x\t\t%04x\n", tfirst, rfirst);
a0ed51b3
LW		 2392
2393 if (rfirst + diff > max)
2394 max = rfirst + diff;
2395 rfirst += diff + 1;
2396 if (!grows) {
2397 if (rfirst <= 0x80)
2398 ;
2399 else if (rfirst <= 0x800)
2400 grows |= (tfirst < 0x80);
2401 else if (rfirst <= 0x10000)
2402 grows |= (tfirst < 0x800);
2403 else if (rfirst <= 0x200000)
2404 grows |= (tfirst < 0x10000);
2405 else if (rfirst <= 0x4000000)
2406 grows |= (tfirst < 0x200000);
2407 else if (rfirst <= 0x80000000)
2408 grows |= (tfirst < 0x4000000);
2409 }
2410 }
2411 tfirst += diff + 1;
2412 }
2413
2414 none = ++max;
2415 if (del)
2416 del = ++max;
2417
2418 if (max > 0xffff)
2419 bits = 32;
2420 else if (max > 0xff)
2421 bits = 16;
2422 else
2423 bits = 8;
2424
2425 cSVOPo->op_sv = (SV*)swash_init("utf8", "", listsv, bits, none);
2426 SvREFCNT_dec(listsv);
2427 if (transv)
2428 SvREFCNT_dec(transv);
2429
2430 if (!del && havefinal)
2431 (void)hv_store((HV*)SvRV((cSVOPo->op_sv)), "FINAL", 5, newSViv((IV)final), 0);
2432
2433 if (grows && to_utf)
2434 o->op_private |= OPpTRANS_GROWS;
2435
2436 op_free(expr);
2437 op_free(repl);
2438 return o;
2439 }
2440
2441 tbl = (short*)cPVOPo->op_pv;
79072805
LW		 2442 if (complement) {
2443 Zero(tbl, 256, short);
2444 for (i = 0; i < tlen; i++)
ec49126f 2445 tbl[t[i]] = -1;
79072805
LW		 2446 for (i = 0, j = 0; i < 256; i++) {
2447 if (!tbl[i]) {
2448 if (j >= rlen) {
a0ed51b3 2449 if (del)
79072805
LW		 2450 tbl[i] = -2;
2451 else if (rlen)
ec49126f 2452 tbl[i] = r[j-1];
79072805
LW		 2453 else
2454 tbl[i] = i;
2455 }
2456 else
ec49126f 2457 tbl[i] = r[j++];
79072805
LW		 2458 }
2459 }
2460 }
2461 else {
a0ed51b3 2462 if (!rlen && !del) {
79072805 2463 r = t; rlen = tlen;
5d06d08e 2464 if (!squash)
4757a243 2465 o->op_private |= OPpTRANS_IDENTICAL;
79072805
LW		 2466 }
2467 for (i = 0; i < 256; i++)
2468 tbl[i] = -1;
2469 for (i = 0, j = 0; i < tlen; i++,j++) {
2470 if (j >= rlen) {
a0ed51b3 2471 if (del) {
ec49126f 2472 if (tbl[t[i]] == -1)
2473 tbl[t[i]] = -2;
79072805
LW		 2474 continue;
2475 }
2476 --j;
2477 }
ec49126f 2478 if (tbl[t[i]] == -1)
2479 tbl[t[i]] = r[j];
79072805
LW		 2480 }
2481 }
2482 op_free(expr);
2483 op_free(repl);
2484
11343788 2485 return o;
79072805
LW		 2486}
2487
2488OP *
864dbfa3 2489Perl_newPMOP(pTHX_ I32 type, I32 flags)
79072805 2490{
11343788 2491 dTHR;
79072805
LW		 2492 PMOP *pmop;
2493
b7dc083c 2494 NewOp(1101, pmop, 1, PMOP);
79072805 2495 pmop->op_type = type;
22c35a8c 2496 pmop->op_ppaddr = PL_ppaddr[type];
79072805 2497 pmop->op_flags = flags;
c07a80fd 2498 pmop->op_private = 0 | (flags >> 8);
79072805 2499
3280af22 2500 if (PL_hints & HINT_RE_TAINT)
b3eb6a9b 2501 pmop->op_pmpermflags |= PMf_RETAINT;
3280af22 2502 if (PL_hints & HINT_LOCALE)
b3eb6a9b
GS		 2503 pmop->op_pmpermflags |= PMf_LOCALE;
2504 pmop->op_pmflags = pmop->op_pmpermflags;
36477c24 2505
79072805 2506 /* link into pm list */
3280af22
NIS		 2507 if (type != OP_TRANS && PL_curstash) {
2508 pmop->op_pmnext = HvPMROOT(PL_curstash);
2509 HvPMROOT(PL_curstash) = pmop;
79072805
LW		 2510 }
2511
2512 return (OP*)pmop;
2513}
2514
2515OP *
864dbfa3 2516Perl_pmruntime(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2517{
5c0ca799 2518 dTHR;
79072805
LW		 2519 PMOP *pm;
2520 LOGOP *rcop;
ce862d02 2521 I32 repl_has_vars = 0;
79072805 2522
11343788
MB		 2523 if (o->op_type == OP_TRANS)
2524 return pmtrans(o, expr, repl);
79072805 2525
3280af22 2526 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2527 pm = (PMOP*)o;
79072805
LW		 2528
2529 if (expr->op_type == OP_CONST) {
463ee0b2 2530 STRLEN plen;
79072805 2531 SV *pat = ((SVOP*)expr)->op_sv;
463ee0b2 2532 char *p = SvPV(pat, plen);
11343788 2533 if ((o->op_flags & OPf_SPECIAL) && strEQ(p, " ")) {
93a17b20 2534 sv_setpvn(pat, "\\s+", 3);
463ee0b2 2535 p = SvPV(pat, plen);
79072805
LW		 2536 pm->op_pmflags |= PMf_SKIPWHITE;
2537 }
cea2e8a9 2538 pm->op_pmregexp = CALLREGCOMP(aTHX_ p, p + plen, pm);
aeea060c 2539 if (strEQ("\\s+", pm->op_pmregexp->precomp))
85e6fe83 2540 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2541 op_free(expr);
2542 }
2543 else {
3280af22
NIS		 2544 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL))
2545 expr = newUNOP((!(PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2546 ? OP_REGCRESET
2547 : OP_REGCMAYBE),0,expr);
463ee0b2 2548
b7dc083c 2549 NewOp(1101, rcop, 1, LOGOP);
79072805 2550 rcop->op_type = OP_REGCOMP;
22c35a8c 2551 rcop->op_ppaddr = PL_ppaddr[OP_REGCOMP];
79072805 2552 rcop->op_first = scalar(expr);
3280af22 2553 rcop->op_flags |= ((PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2554 ? (OPf_SPECIAL | OPf_KIDS)
2555 : OPf_KIDS);
79072805 2556 rcop->op_private = 1;
11343788 2557 rcop->op_other = o;
79072805
LW		 2558
2559 /* establish postfix order */
3280af22 2560 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL)) {
463ee0b2
LW		 2561 LINKLIST(expr);
2562 rcop->op_next = expr;
2563 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2564 }
2565 else {
2566 rcop->op_next = LINKLIST(expr);
2567 expr->op_next = (OP*)rcop;
2568 }
79072805 2569
11343788 2570 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2571 }
2572
2573 if (repl) {
748a9306 2574 OP *curop;
0244c3a4 2575 if (pm->op_pmflags & PMf_EVAL) {
748a9306 2576 curop = 0;
0244c3a4
GS		 2577 if (PL_curcop->cop_line < PL_multi_end)
2578 PL_curcop->cop_line = PL_multi_end;
2579 }
554b3eca 2580#ifdef USE_THREADS
2faa37cc 2581 else if (repl->op_type == OP_THREADSV
554b3eca 2582 && strchr("&`'123456789+",
533c011a 2583 PL_threadsv_names[repl->op_targ]))
554b3eca
MB		 2584 {
2585 curop = 0;
2586 }
2587#endif /* USE_THREADS */
748a9306
LW		 2588 else if (repl->op_type == OP_CONST)
2589 curop = repl;
79072805 2590 else {
79072805
LW		 2591 OP *lastop = 0;
2592 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
22c35a8c 2593 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
554b3eca 2594#ifdef USE_THREADS
ce862d02
IZ		 2595 if (curop->op_type == OP_THREADSV) {
2596 repl_has_vars = 1;
be949f6f 2597 if (strchr("&`'123456789+", curop->op_private))
ce862d02 2598 break;
554b3eca
MB		 2599 }
2600#else
79072805
LW		 2601 if (curop->op_type == OP_GV) {
2602 GV *gv = ((GVOP*)curop)->op_gv;
ce862d02 2603 repl_has_vars = 1;
93a17b20 2604 if (strchr("&`'123456789+", *GvENAME(gv)))
79072805
LW		 2605 break;
2606 }
554b3eca 2607#endif /* USE_THREADS */
79072805
LW		 2608 else if (curop->op_type == OP_RV2CV)
2609 break;
2610 else if (curop->op_type == OP_RV2SV ||
2611 curop->op_type == OP_RV2AV ||
2612 curop->op_type == OP_RV2HV ||
2613 curop->op_type == OP_RV2GV) {
2614 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2615 break;
2616 }
748a9306
LW		 2617 else if (curop->op_type == OP_PADSV ||
2618 curop->op_type == OP_PADAV ||
2619 curop->op_type == OP_PADHV ||
554b3eca 2620 curop->op_type == OP_PADANY) {
ce862d02 2621 repl_has_vars = 1;
748a9306 2622 }
1167e5da
SM		 2623 else if (curop->op_type == OP_PUSHRE)
2624 ; /* Okay here, dangerous in newASSIGNOP */
79072805
LW		 2625 else
2626 break;
2627 }
2628 lastop = curop;
2629 }
748a9306 2630 }
ce862d02
IZ		 2631 if (curop == repl
2632 && !(repl_has_vars
2633 && (!pm->op_pmregexp
2634 || pm->op_pmregexp->reganch & ROPT_EVAL_SEEN))) {
748a9306 2635 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2636 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2637 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2638 }
2639 else {
ce862d02
IZ		 2640 if (curop == repl && !pm->op_pmregexp) { /* Has variables. */
2641 pm->op_pmflags |= PMf_MAYBE_CONST;
2642 pm->op_pmpermflags |= PMf_MAYBE_CONST;
2643 }
b7dc083c 2644 NewOp(1101, rcop, 1, LOGOP);
748a9306 2645 rcop->op_type = OP_SUBSTCONT;
22c35a8c 2646 rcop->op_ppaddr = PL_ppaddr[OP_SUBSTCONT];
748a9306
LW		 2647 rcop->op_first = scalar(repl);
2648 rcop->op_flags |= OPf_KIDS;
2649 rcop->op_private = 1;
11343788 2650 rcop->op_other = o;
748a9306
LW		 2651
2652 /* establish postfix order */
2653 rcop->op_next = LINKLIST(repl);
2654 repl->op_next = (OP*)rcop;
2655
2656 pm->op_pmreplroot = scalar((OP*)rcop);
2657 pm->op_pmreplstart = LINKLIST(rcop);
2658 rcop->op_next = 0;
79072805
LW		 2659 }
2660 }
2661
2662 return (OP*)pm;
2663}
2664
2665OP *
864dbfa3 2666Perl_newSVOP(pTHX_ I32 type, I32 flags, SV *sv)
79072805
LW		 2667{
2668 SVOP *svop;
b7dc083c 2669 NewOp(1101, svop, 1, SVOP);
79072805 2670 svop->op_type = type;
22c35a8c 2671 svop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2672 svop->op_sv = sv;
2673 svop->op_next = (OP*)svop;
2674 svop->op_flags = flags;
22c35a8c 2675 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2676 scalar((OP*)svop);
22c35a8c 2677 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2678 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2679 return CHECKOP(type, svop);
79072805
LW		 2680}
2681
2682OP *
864dbfa3 2683Perl_newGVOP(pTHX_ I32 type, I32 flags, GV *gv)
79072805 2684{
11343788 2685 dTHR;
79072805 2686 GVOP *gvop;
b7dc083c 2687 NewOp(1101, gvop, 1, GVOP);
79072805 2688 gvop->op_type = type;
22c35a8c 2689 gvop->op_ppaddr = PL_ppaddr[type];
8990e307 2690 gvop->op_gv = (GV*)SvREFCNT_inc(gv);
79072805
LW		 2691 gvop->op_next = (OP*)gvop;
2692 gvop->op_flags = flags;
22c35a8c 2693 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2694 scalar((OP*)gvop);
22c35a8c 2695 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2696 gvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2697 return CHECKOP(type, gvop);
79072805
LW		 2698}
2699
2700OP *
864dbfa3 2701Perl_newPVOP(pTHX_ I32 type, I32 flags, char *pv)
79072805
LW		 2702{
2703 PVOP *pvop;
b7dc083c 2704 NewOp(1101, pvop, 1, PVOP);
79072805 2705 pvop->op_type = type;
22c35a8c 2706 pvop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2707 pvop->op_pv = pv;
2708 pvop->op_next = (OP*)pvop;
2709 pvop->op_flags = flags;
22c35a8c 2710 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2711 scalar((OP*)pvop);
22c35a8c 2712 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2713 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2714 return CHECKOP(type, pvop);
79072805
LW		 2715}
2716
79072805 2717void
864dbfa3 2718Perl_package(pTHX_ OP *o)
79072805 2719{
11343788 2720 dTHR;
93a17b20 2721 SV *sv;
79072805 2722
3280af22
NIS		 2723 save_hptr(&PL_curstash);
2724 save_item(PL_curstname);
11343788 2725 if (o) {
463ee0b2
LW		 2726 STRLEN len;
2727 char *name;
11343788 2728 sv = cSVOPo->op_sv;
463ee0b2 2729 name = SvPV(sv, len);
3280af22
NIS		 2730 PL_curstash = gv_stashpvn(name,len,TRUE);
2731 sv_setpvn(PL_curstname, name, len);
11343788 2732 op_free(o);
93a17b20
LW		 2733 }
2734 else {
3280af22
NIS		 2735 sv_setpv(PL_curstname,"<none>");
2736 PL_curstash = Nullhv;
93a17b20 2737 }
7ad382f4 2738 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 2739 PL_copline = NOLINE;
2740 PL_expect = XSTATE;
79072805
LW		 2741}
2742
85e6fe83 2743void
864dbfa3 2744Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *id, OP *arg)
85e6fe83 2745{
a0d0e21e
LW		 2746 OP *pack;
2747 OP *meth;
2748 OP *rqop;
2749 OP *imop;
b1cb66bf 2750 OP *veop;
78ca652e 2751 GV *gv;
85e6fe83 2752
a0d0e21e 2753 if (id->op_type != OP_CONST)
cea2e8a9 2754 Perl_croak(aTHX_ "Module name must be constant");
85e6fe83 2755
b1cb66bf 2756 veop = Nullop;
2757
2758 if(version != Nullop) {
2759 SV *vesv = ((SVOP*)version)->op_sv;
2760
2761 if (arg == Nullop && !SvNIOK(vesv)) {
2762 arg = version;
2763 }
2764 else {
2765 OP *pack;
2766 OP *meth;
2767
2768 if (version->op_type != OP_CONST || !SvNIOK(vesv))
cea2e8a9 2769 Perl_croak(aTHX_ "Version number must be constant number");
b1cb66bf 2770
2771 /* Make copy of id so we don't free it twice */
2772 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
2773
2774 /* Fake up a method call to VERSION */
79cb57f6 2775 meth = newSVOP(OP_CONST, 0, newSVpvn("VERSION", 7));
b1cb66bf 2776 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
2777 append_elem(OP_LIST,
2778 prepend_elem(OP_LIST, pack, list(version)),
2779 newUNOP(OP_METHOD, 0, meth)));
2780 }
2781 }
aeea060c 2782
a0d0e21e 2783 /* Fake up an import/unimport */
4633a7c4
LW		 2784 if (arg && arg->op_type == OP_STUB)
2785 imop = arg; /* no import on explicit () */
b1cb66bf 2786 else if(SvNIOK(((SVOP*)id)->op_sv)) {
2787 imop = Nullop; /* use 5.0; */
2788 }
4633a7c4
LW		 2789 else {
2790 /* Make copy of id so we don't free it twice */
2791 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
4633a7c4
LW		 2792 meth = newSVOP(OP_CONST, 0,
2793 aver
79cb57f6
GS		 2794 ? newSVpvn("import", 6)
2795 : newSVpvn("unimport", 8)
4633a7c4
LW		 2796 );
2797 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
a0d0e21e
LW		 2798 append_elem(OP_LIST,
2799 prepend_elem(OP_LIST, pack, list(arg)),
2800 newUNOP(OP_METHOD, 0, meth)));
4633a7c4
LW		 2801 }
2802
78ca652e
GS		 2803 /* Fake up a require, handle override, if any */
2804 gv = gv_fetchpv("require", FALSE, SVt_PVCV);
2805 if (!(gv && GvIMPORTED_CV(gv)))
2806 gv = gv_fetchpv("CORE::GLOBAL::require", FALSE, SVt_PVCV);
2807
2808 if (gv && GvIMPORTED_CV(gv)) {
2809 rqop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
2810 append_elem(OP_LIST, id,
2811 scalar(newUNOP(OP_RV2CV, 0,
2812 newGVOP(OP_GV, 0,
2813 gv))))));
2814 }
2815 else {
2816 rqop = newUNOP(OP_REQUIRE, 0, id);
2817 }
a0d0e21e
LW		 2818
2819 /* Fake up the BEGIN {}, which does its thing immediately. */
c07a80fd 2820 newSUB(floor,
79cb57f6 2821 newSVOP(OP_CONST, 0, newSVpvn("BEGIN", 5)),
4633a7c4 2822 Nullop,
a0d0e21e 2823 append_elem(OP_LINESEQ,
b1cb66bf 2824 append_elem(OP_LINESEQ,
2825 newSTATEOP(0, Nullch, rqop),
2826 newSTATEOP(0, Nullch, veop)),
a0d0e21e 2827 newSTATEOP(0, Nullch, imop) ));
85e6fe83 2828
3280af22
NIS		 2829 PL_copline = NOLINE;
2830 PL_expect = XSTATE;
85e6fe83
LW		 2831}
2832
79072805 2833OP *
864dbfa3 2834Perl_dofile(pTHX_ OP *term)
78ca652e
GS		 2835{
2836 OP *doop;
2837 GV *gv;
2838
2839 gv = gv_fetchpv("do", FALSE, SVt_PVCV);
2840 if (!(gv && GvIMPORTED_CV(gv)))
2841 gv = gv_fetchpv("CORE::GLOBAL::do", FALSE, SVt_PVCV);
2842
2843 if (gv && GvIMPORTED_CV(gv)) {
2844 doop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
2845 append_elem(OP_LIST, term,
2846 scalar(newUNOP(OP_RV2CV, 0,
2847 newGVOP(OP_GV, 0,
2848 gv))))));
2849 }
2850 else {
2851 doop = newUNOP(OP_DOFILE, 0, scalar(term));
2852 }
2853 return doop;
2854}
2855
2856OP *
864dbfa3 2857Perl_newSLICEOP(pTHX_ I32 flags, OP *subscript, OP *listval)
79072805
LW		 2858{
2859 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 2860 list(force_list(subscript)),
2861 list(force_list(listval)) );
79072805
LW		 2862}
2863
76e3520e 2864STATIC I32
cea2e8a9 2865S_list_assignment(pTHX_ register OP *o)
79072805 2866{
11343788 2867 if (!o)
79072805
LW		 2868 return TRUE;
2869
11343788
MB		 2870 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
2871 o = cUNOPo->op_first;
79072805 2872
11343788 2873 if (o->op_type == OP_COND_EXPR) {
1a67a97c
SM		 2874 I32 t = list_assignment(cLOGOPo->op_first->op_sibling);
2875 I32 f = list_assignment(cLOGOPo->op_first->op_sibling->op_sibling);
79072805
LW		 2876
2877 if (t && f)
2878 return TRUE;
2879 if (t || f)
2880 yyerror("Assignment to both a list and a scalar");
2881 return FALSE;
2882 }
2883
11343788
MB		 2884 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
2885 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
2886 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 2887 return TRUE;
2888
11343788 2889 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 2890 return TRUE;
2891
11343788 2892 if (o->op_type == OP_RV2SV)
79072805
LW		 2893 return FALSE;
2894
2895 return FALSE;
2896}
2897
2898OP *
864dbfa3 2899Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
79072805 2900{
11343788 2901 OP *o;
79072805 2902
a0d0e21e
LW		 2903 if (optype) {
2904 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN) {
2905 return newLOGOP(optype, 0,
2906 mod(scalar(left), optype),
2907 newUNOP(OP_SASSIGN, 0, scalar(right)));
2908 }
2909 else {
2910 return newBINOP(optype, OPf_STACKED,
2911 mod(scalar(left), optype), scalar(right));
2912 }
2913 }
2914
79072805 2915 if (list_assignment(left)) {
6ee623d5 2916 dTHR;
3280af22
NIS		 2917 PL_modcount = 0;
2918 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 2919 left = mod(left, OP_AASSIGN);
3280af22
NIS		 2920 if (PL_eval_start)
2921 PL_eval_start = 0;
748a9306 2922 else {
a0d0e21e
LW		 2923 op_free(left);
2924 op_free(right);
2925 return Nullop;
2926 }
11343788 2927 o = newBINOP(OP_AASSIGN, flags,
8990e307
LW		 2928 list(force_list(right)),
2929 list(force_list(left)) );
11343788 2930 o->op_private = 0 | (flags >> 8);
a0d0e21e 2931 if (!(left->op_private & OPpLVAL_INTRO)) {
79072805 2932 OP *curop;
11343788 2933 OP *lastop = o;
3280af22 2934 PL_generation++;
11343788 2935 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
22c35a8c 2936 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805
LW		 2937 if (curop->op_type == OP_GV) {
2938 GV *gv = ((GVOP*)curop)->op_gv;
3280af22 2939 if (gv == PL_defgv || SvCUR(gv) == PL_generation)
79072805 2940 break;
3280af22 2941 SvCUR(gv) = PL_generation;
79072805 2942 }
748a9306
LW		 2943 else if (curop->op_type == OP_PADSV ||
2944 curop->op_type == OP_PADAV ||
2945 curop->op_type == OP_PADHV ||
2946 curop->op_type == OP_PADANY) {
3280af22 2947 SV **svp = AvARRAY(PL_comppad_name);
8e07c86e 2948 SV *sv = svp[curop->op_targ];
3280af22 2949 if (SvCUR(sv) == PL_generation)
748a9306 2950 break;
3280af22 2951 SvCUR(sv) = PL_generation; /* (SvCUR not used any more) */
748a9306 2952 }
79072805
LW		 2953 else if (curop->op_type == OP_RV2CV)
2954 break;
2955 else if (curop->op_type == OP_RV2SV ||
2956 curop->op_type == OP_RV2AV ||
2957 curop->op_type == OP_RV2HV ||
2958 curop->op_type == OP_RV2GV) {
2959 if (lastop->op_type != OP_GV) /* funny deref? */
2960 break;
2961 }
1167e5da
SM		 2962 else if (curop->op_type == OP_PUSHRE) {
2963 if (((PMOP*)curop)->op_pmreplroot) {
2964 GV *gv = (GV*)((PMOP*)curop)->op_pmreplroot;
3280af22 2965 if (gv == PL_defgv || SvCUR(gv) == PL_generation)
1167e5da 2966 break;
3280af22 2967 SvCUR(gv) = PL_generation;
1167e5da
SM		 2968 }
2969 }
79072805
LW		 2970 else
2971 break;
2972 }
2973 lastop = curop;
2974 }
11343788
MB		 2975 if (curop != o)
2976 o->op_private = OPpASSIGN_COMMON;
79072805 2977 }
c07a80fd 2978 if (right && right->op_type == OP_SPLIT) {
2979 OP* tmpop;
2980 if ((tmpop = ((LISTOP*)right)->op_first) &&
2981 tmpop->op_type == OP_PUSHRE)
2982 {
2983 PMOP *pm = (PMOP*)tmpop;
2984 if (left->op_type == OP_RV2AV &&
2985 !(left->op_private & OPpLVAL_INTRO) &&
11343788 2986 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 2987 {
2988 tmpop = ((UNOP*)left)->op_first;
2989 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
2990 pm->op_pmreplroot = (OP*)((GVOP*)tmpop)->op_gv;
2991 pm->op_pmflags |= PMf_ONCE;
11343788 2992 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 2993 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
2994 tmpop->op_sibling = Nullop; /* don't free split */
2995 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 2996 op_free(o); /* blow off assign */
54310121 2997 right->op_flags &= ~OPf_WANT;
a5f75d66 2998 /* "I don't know and I don't care." */
c07a80fd 2999 return right;
3000 }
3001 }
3002 else {
3280af22 3003 if (PL_modcount < 10000 &&
c07a80fd 3004 ((LISTOP*)right)->op_last->op_type == OP_CONST)
3005 {
3006 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
3007 if (SvIVX(sv) == 0)
3280af22 3008 sv_setiv(sv, PL_modcount+1);
c07a80fd 3009 }
3010 }
3011 }
3012 }
11343788 3013 return o;
79072805
LW		 3014 }
3015 if (!right)
3016 right = newOP(OP_UNDEF, 0);
3017 if (right->op_type == OP_READLINE) {
3018 right->op_flags |= OPf_STACKED;
463ee0b2 3019 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 3020 }
a0d0e21e 3021 else {
3280af22 3022 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 3023 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 3024 scalar(right), mod(scalar(left), OP_SASSIGN) );
3280af22
NIS		 3025 if (PL_eval_start)
3026 PL_eval_start = 0;
748a9306 3027 else {
11343788 3028 op_free(o);
a0d0e21e
LW		 3029 return Nullop;
3030 }
3031 }
11343788 3032 return o;
79072805
LW		 3033}
3034
3035OP *
864dbfa3 3036Perl_newSTATEOP(pTHX_ I32 flags, char *label, OP *o)
79072805 3037{
11343788 3038 dTHR;
bbce6d69 3039 U32 seq = intro_my();
79072805
LW		 3040 register COP *cop;
3041
b7dc083c 3042 NewOp(1101, cop, 1, COP);
3280af22 3043 if (PERLDB_LINE && PL_curcop->cop_line && PL_curstash != PL_debstash) {
8990e307 3044 cop->op_type = OP_DBSTATE;
22c35a8c 3045 cop->op_ppaddr = PL_ppaddr[ OP_DBSTATE ];
8990e307
LW		 3046 }
3047 else {
3048 cop->op_type = OP_NEXTSTATE;
22c35a8c 3049 cop->op_ppaddr = PL_ppaddr[ OP_NEXTSTATE ];
8990e307 3050 }
79072805 3051 cop->op_flags = flags;
a0ed51b3 3052 cop->op_private = (PL_hints & HINT_UTF8);
ff0cee69 3053#ifdef NATIVE_HINTS
3054 cop->op_private |= NATIVE_HINTS;
3055#endif
e24b16f9 3056 PL_compiling.op_private = cop->op_private;
79072805
LW		 3057 cop->op_next = (OP*)cop;
3058
463ee0b2
LW		 3059 if (label) {
3060 cop->cop_label = label;
3280af22 3061 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 3062 }
bbce6d69 3063 cop->cop_seq = seq;
3280af22 3064 cop->cop_arybase = PL_curcop->cop_arybase;
0453d815 3065 if (specialWARN(PL_curcop->cop_warnings))
599cee73
PM		 3066 cop->cop_warnings = PL_curcop->cop_warnings ;
3067 else
3068 cop->cop_warnings = newSVsv(PL_curcop->cop_warnings) ;
3069
79072805 3070
3280af22
NIS		 3071 if (PL_copline == NOLINE)
3072 cop->cop_line = PL_curcop->cop_line;
79072805 3073 else {
3280af22
NIS		 3074 cop->cop_line = PL_copline;
3075 PL_copline = NOLINE;
79072805 3076 }
3280af22
NIS		 3077 cop->cop_filegv = (GV*)SvREFCNT_inc(PL_curcop->cop_filegv);
3078 cop->cop_stash = PL_curstash;
79072805 3079
3280af22
NIS		 3080 if (PERLDB_LINE && PL_curstash != PL_debstash) {
3081 SV **svp = av_fetch(GvAV(PL_curcop->cop_filegv),(I32)cop->cop_line, FALSE);
3082 if (svp && *svp != &PL_sv_undef && !SvIOK(*svp)) {
a0d0e21e 3083 (void)SvIOK_on(*svp);
a5f75d66 3084 SvIVX(*svp) = 1;
93a17b20
LW		 3085 SvSTASH(*svp) = (HV*)cop;
3086 }
3087 }
3088
11343788 3089 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 3090}
3091
bbce6d69 3092/* "Introduce" my variables to visible status. */
3093U32
864dbfa3 3094Perl_intro_my(pTHX)
bbce6d69 3095{
3096 SV **svp;
3097 SV *sv;
3098 I32 i;
3099
3280af22
NIS		 3100 if (! PL_min_intro_pending)
3101 return PL_cop_seqmax;
bbce6d69 3102
3280af22
NIS		 3103 svp = AvARRAY(PL_comppad_name);
3104 for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) {
3105 if ((sv = svp[i]) && sv != &PL_sv_undef && !SvIVX(sv)) {
c53d7c7d 3106 SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */
65202027 3107 SvNVX(sv) = (NV)PL_cop_seqmax;
bbce6d69 3108 }
3109 }
3280af22
NIS		 3110 PL_min_intro_pending = 0;
3111 PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */
3112 return PL_cop_seqmax++;
bbce6d69 3113}
3114
79072805 3115OP *
864dbfa3 3116Perl_newLOGOP(pTHX_ I32 type, I32 flags, OP *first, OP *other)
79072805 3117{
883ffac3
CS		 3118 return new_logop(type, flags, &first, &other);
3119}
3120
3bd495df 3121STATIC OP *
cea2e8a9 3122S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
883ffac3 3123{
11343788 3124 dTHR;
79072805 3125 LOGOP *logop;
11343788 3126 OP *o;
883ffac3
CS		 3127 OP *first = *firstp;
3128 OP *other = *otherp;
79072805 3129
a0d0e21e
LW		 3130 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
3131 return newBINOP(type, flags, scalar(first), scalar(other));
3132
8990e307 3133 scalarboolean(first);
79072805
LW		 3134 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
3135 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
3136 if (type == OP_AND || type == OP_OR) {
3137 if (type == OP_AND)
3138 type = OP_OR;
3139 else
3140 type = OP_AND;
11343788 3141 o = first;
883ffac3 3142 first = *firstp = cUNOPo->op_first;
11343788
MB		 3143 if (o->op_next)
3144 first->op_next = o->op_next;
3145 cUNOPo->op_first = Nullop;
3146 op_free(o);
79072805
LW		 3147 }
3148 }
3149 if (first->op_type == OP_CONST) {
599cee73 3150 if (ckWARN(WARN_PRECEDENCE) && (first->op_private & OPpCONST_BARE))
cea2e8a9 3151 Perl_warner(aTHX_ WARN_PRECEDENCE, "Probable precedence problem on %s",
22c35a8c 3152 PL_op_desc[type]);
79072805
LW		 3153 if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
3154 op_free(first);
883ffac3 3155 *firstp = Nullop;
79072805
LW		 3156 return other;
3157 }
3158 else {
3159 op_free(other);
883ffac3 3160 *otherp = Nullop;
79072805
LW		 3161 return first;
3162 }
3163 }
3164 else if (first->op_type == OP_WANTARRAY) {
3165 if (type == OP_AND)
3166 list(other);
3167 else
3168 scalar(other);
3169 }
599cee73 3170 else if (ckWARN(WARN_UNSAFE) && (first->op_flags & OPf_KIDS)) {
a6006777 3171 OP *k1 = ((UNOP*)first)->op_first;
3172 OP *k2 = k1->op_sibling;
3173 OPCODE warnop = 0;
3174 switch (first->op_type)
3175 {
3176 case OP_NULL:
3177 if (k2 && k2->op_type == OP_READLINE
3178 && (k2->op_flags & OPf_STACKED)
55d729e4 3179 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
a6006777 3180 warnop = k2->op_type;
3181 break;
3182
3183 case OP_SASSIGN:
68dc0745 3184 if (k1->op_type == OP_READDIR
3185 || k1->op_type == OP_GLOB
3186 || k1->op_type == OP_EACH)
a6006777 3187 warnop = k1->op_type;
3188 break;
3189 }
8ebc5c01 3190 if (warnop) {
3280af22
NIS		 3191 line_t oldline = PL_curcop->cop_line;
3192 PL_curcop->cop_line = PL_copline;
cea2e8a9 3193 Perl_warner(aTHX_ WARN_UNSAFE,
599cee73 3194 "Value of %s%s can be \"0\"; test with defined()",
22c35a8c 3195 PL_op_desc[warnop],
68dc0745 3196 ((warnop == OP_READLINE || warnop == OP_GLOB)
3197 ? " construct" : "() operator"));
3280af22 3198 PL_curcop->cop_line = oldline;
8ebc5c01 3199 }
a6006777 3200 }
79072805
LW		 3201
3202 if (!other)
3203 return first;
3204
a0d0e21e
LW		 3205 if (type == OP_ANDASSIGN || type == OP_ORASSIGN)
3206 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
3207
b7dc083c 3208 NewOp(1101, logop, 1, LOGOP);
79072805
LW		 3209
3210 logop->op_type = type;
22c35a8c 3211 logop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3212 logop->op_first = first;
3213 logop->op_flags = flags | OPf_KIDS;
3214 logop->op_other = LINKLIST(other);
c07a80fd 3215 logop->op_private = 1 | (flags >> 8);
79072805
LW		 3216
3217 /* establish postfix order */
3218 logop->op_next = LINKLIST(first);
3219 first->op_next = (OP*)logop;
3220 first->op_sibling = other;
3221
11343788
MB		 3222 o = newUNOP(OP_NULL, 0, (OP*)logop);
3223 other->op_next = o;
79072805 3224
11343788 3225 return o;
79072805
LW		 3226}
3227
3228OP *
864dbfa3 3229Perl_newCONDOP(pTHX_ I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 3230{
11343788 3231 dTHR;
1a67a97c
SM		 3232 LOGOP *logop;
3233 OP *start;
11343788 3234 OP *o;
79072805 3235
b1cb66bf 3236 if (!falseop)
3237 return newLOGOP(OP_AND, 0, first, trueop);
3238 if (!trueop)
3239 return newLOGOP(OP_OR, 0, first, falseop);
79072805 3240
8990e307 3241 scalarboolean(first);
79072805
LW		 3242 if (first->op_type == OP_CONST) {
3243 if (SvTRUE(((SVOP*)first)->op_sv)) {
3244 op_free(first);
b1cb66bf 3245 op_free(falseop);
3246 return trueop;
79072805
LW		 3247 }
3248 else {
3249 op_free(first);
b1cb66bf 3250 op_free(trueop);
3251 return falseop;
79072805
LW		 3252 }
3253 }
3254 else if (first->op_type == OP_WANTARRAY) {
b1cb66bf 3255 list(trueop);
3256 scalar(falseop);
79072805 3257 }
1a67a97c
SM		 3258 NewOp(1101, logop, 1, LOGOP);
3259 logop->op_type = OP_COND_EXPR;
3260 logop->op_ppaddr = PL_ppaddr[OP_COND_EXPR];
3261 logop->op_first = first;
3262 logop->op_flags = flags | OPf_KIDS;
3263 logop->op_private = 1 | (flags >> 8);
3264 logop->op_other = LINKLIST(trueop);
3265 logop->op_next = LINKLIST(falseop);
79072805 3266
79072805
LW		 3267
3268 /* establish postfix order */
1a67a97c
SM		 3269 start = LINKLIST(first);
3270 first->op_next = (OP*)logop;
79072805 3271
b1cb66bf 3272 first->op_sibling = trueop;
3273 trueop->op_sibling = falseop;
1a67a97c 3274 o = newUNOP(OP_NULL, 0, (OP*)logop);
79072805 3275
1a67a97c 3276 trueop->op_next = falseop->op_next = o;
79072805 3277
1a67a97c 3278 o->op_next = start;
11343788 3279 return o;
79072805
LW		 3280}
3281
3282OP *
864dbfa3 3283Perl_newRANGE(pTHX_ I32 flags, OP *left, OP *right)
79072805 3284{
b35b2403 3285 dTHR;
1a67a97c 3286 LOGOP *range;
79072805
LW		 3287 OP *flip;
3288 OP *flop;
1a67a97c 3289 OP *leftstart;
11343788 3290 OP *o;
79072805 3291
1a67a97c 3292 NewOp(1101, range, 1, LOGOP);
79072805 3293
1a67a97c
SM		 3294 range->op_type = OP_RANGE;
3295 range->op_ppaddr = PL_ppaddr[OP_RANGE];
3296 range->op_first = left;
3297 range->op_flags = OPf_KIDS;
3298 leftstart = LINKLIST(left);
3299 range->op_other = LINKLIST(right);
3300 range->op_private = 1 | (flags >> 8);
79072805
LW		 3301
3302 left->op_sibling = right;
3303
1a67a97c
SM		 3304 range->op_next = (OP*)range;
3305 flip = newUNOP(OP_FLIP, flags, (OP*)range);
79072805 3306 flop = newUNOP(OP_FLOP, 0, flip);
11343788 3307 o = newUNOP(OP_NULL, 0, flop);
79072805 3308 linklist(flop);
1a67a97c 3309 range->op_next = leftstart;
79072805
LW		 3310
3311 left->op_next = flip;
3312 right->op_next = flop;
3313
1a67a97c
SM		 3314 range->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
3315 sv_upgrade(PAD_SV(range->op_targ), SVt_PVNV);
ed6116ce 3316 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 3317 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
3318
3319 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3320 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3321
11343788 3322 flip->op_next = o;
79072805 3323 if (!flip->op_private || !flop->op_private)
11343788 3324 linklist(o); /* blow off optimizer unless constant */
79072805 3325
11343788 3326 return o;
79072805
LW		 3327}
3328
3329OP *
864dbfa3 3330Perl_newLOOPOP(pTHX_ I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 3331{
11343788 3332 dTHR;
463ee0b2 3333 OP* listop;
11343788 3334 OP* o;
463ee0b2 3335 int once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 3336 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
93a17b20 3337
463ee0b2
LW		 3338 if (expr) {
3339 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
3340 return block; /* do {} while 0 does once */
fb73857a 3341 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3342 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 3343 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3344 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 3345 } else if (expr->op_flags & OPf_KIDS) {
3346 OP *k1 = ((UNOP*)expr)->op_first;
3347 OP *k2 = (k1) ? k1->op_sibling : NULL;
3348 switch (expr->op_type) {
3349 case OP_NULL:
3350 if (k2 && k2->op_type == OP_READLINE
3351 && (k2->op_flags & OPf_STACKED)
3352 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
3353 expr = newUNOP(OP_DEFINED, 0, expr);
3354 break;
3355
3356 case OP_SASSIGN:
3357 if (k1->op_type == OP_READDIR
3358 || k1->op_type == OP_GLOB
3359 || k1->op_type == OP_EACH)
3360 expr = newUNOP(OP_DEFINED, 0, expr);
3361 break;
3362 }
774d564b 3363 }
463ee0b2 3364 }
93a17b20 3365
8990e307 3366 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
883ffac3 3367 o = new_logop(OP_AND, 0, &expr, &listop);
463ee0b2 3368
883ffac3
CS		 3369 if (listop)
3370 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 3371
11343788
MB		 3372 if (once && o != listop)
3373 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 3374
11343788
MB		 3375 if (o == listop)
3376 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 3377
11343788
MB		 3378 o->op_flags |= flags;
3379 o = scope(o);
3380 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
3381 return o;
79072805
LW		 3382}
3383
3384OP *
864dbfa3 3385Perl_newWHILEOP(pTHX_ I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *expr, OP *block, OP *cont)
79072805 3386{
11343788 3387 dTHR;
79072805
LW		 3388 OP *redo;
3389 OP *next = 0;
3390 OP *listop;
11343788 3391 OP *o;
79072805
LW		 3392 OP *condop;
3393
fb73857a 3394 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3395 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB))) {
748a9306 3396 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3397 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 3398 } else if (expr && (expr->op_flags & OPf_KIDS)) {
3399 OP *k1 = ((UNOP*)expr)->op_first;
3400 OP *k2 = (k1) ? k1->op_sibling : NULL;
3401 switch (expr->op_type) {
3402 case OP_NULL:
3403 if (k2 && k2->op_type == OP_READLINE
3404 && (k2->op_flags & OPf_STACKED)
3405 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
3406 expr = newUNOP(OP_DEFINED, 0, expr);
3407 break;
3408
3409 case OP_SASSIGN:
3410 if (k1->op_type == OP_READDIR
3411 || k1->op_type == OP_GLOB
3412 || k1->op_type == OP_EACH)
3413 expr = newUNOP(OP_DEFINED, 0, expr);
3414 break;
3415 }
748a9306 3416 }
79072805
LW		 3417
3418 if (!block)
3419 block = newOP(OP_NULL, 0);
3420
3421 if (cont)
3422 next = LINKLIST(cont);
fb73857a 3423 if (expr) {
79072805 3424 cont = append_elem(OP_LINESEQ, cont, newOP(OP_UNSTACK, 0));
fb73857a 3425 if ((line_t)whileline != NOLINE) {
3280af22 3426 PL_copline = whileline;
fb73857a 3427 cont = append_elem(OP_LINESEQ, cont,
3428 newSTATEOP(0, Nullch, Nullop));
3429 }
3430 }
79072805 3431
463ee0b2 3432 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 3433 redo = LINKLIST(listop);
3434
3435 if (expr) {
3280af22 3436 PL_copline = whileline;
883ffac3
CS		 3437 scalar(listop);
3438 o = new_logop(OP_AND, 0, &expr, &listop);
11343788 3439 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 3440 op_free(expr); /* oops, it's a while (0) */
463ee0b2 3441 op_free((OP*)loop);
883ffac3 3442 return Nullop; /* listop already freed by new_logop */
463ee0b2 3443 }
883ffac3
CS		 3444 if (listop)
3445 ((LISTOP*)listop)->op_last->op_next = condop =
3446 (o == listop ? redo : LINKLIST(o));
79072805
LW		 3447 if (!next)
3448 next = condop;
3449 }
3450 else
11343788 3451 o = listop;
79072805
LW		 3452
3453 if (!loop) {
b7dc083c 3454 NewOp(1101,loop,1,LOOP);
79072805 3455 loop->op_type = OP_ENTERLOOP;
22c35a8c 3456 loop->op_ppaddr = PL_ppaddr[OP_ENTERLOOP];
79072805
LW		 3457 loop->op_private = 0;
3458 loop->op_next = (OP*)loop;
3459 }
3460
11343788 3461 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 3462
3463 loop->op_redoop = redo;
11343788 3464 loop->op_lastop = o;
79072805
LW		 3465
3466 if (next)
3467 loop->op_nextop = next;
3468 else
11343788 3469 loop->op_nextop = o;
79072805 3470
11343788
MB		 3471 o->op_flags |= flags;
3472 o->op_private |= (flags >> 8);
3473 return o;
79072805
LW		 3474}
3475
3476OP *
864dbfa3 3477Perl_newFOROP(pTHX_ I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *block,OP *cont)
79072805
LW		 3478{
3479 LOOP *loop;
b7dc083c 3480 LOOP *tmp;
fb73857a 3481 OP *wop;
85e6fe83 3482 int padoff = 0;
4633a7c4 3483 I32 iterflags = 0;
79072805 3484
79072805 3485 if (sv) {
85e6fe83 3486 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
748a9306 3487 sv->op_type = OP_RV2GV;
22c35a8c 3488 sv->op_ppaddr = PL_ppaddr[OP_RV2GV];
79072805 3489 }
85e6fe83
LW		 3490 else if (sv->op_type == OP_PADSV) { /* private variable */
3491 padoff = sv->op_targ;
3492 op_free(sv);
3493 sv = Nullop;
3494 }
54b9620d
MB		 3495 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
3496 padoff = sv->op_targ;
3497 iterflags |= OPf_SPECIAL;
3498 op_free(sv);
3499 sv = Nullop;
3500 }
79072805 3501 else
cea2e8a9 3502 Perl_croak(aTHX_ "Can't use %s for loop variable", PL_op_desc[sv->op_type]);
79072805
LW		 3503 }
3504 else {
54b9620d
MB		 3505#ifdef USE_THREADS
3506 padoff = find_threadsv("_");
3507 iterflags |= OPf_SPECIAL;
3508#else
3280af22 3509 sv = newGVOP(OP_GV, 0, PL_defgv);
54b9620d 3510#endif
79072805 3511 }
5f05dabc 3512 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
89ea2908 3513 expr = mod(force_list(scalar(ref(expr, OP_ITER))), OP_GREPSTART);
4633a7c4
LW		 3514 iterflags |= OPf_STACKED;
3515 }
89ea2908
GA		 3516 else if (expr->op_type == OP_NULL &&
3517 (expr->op_flags & OPf_KIDS) &&
3518 ((BINOP*)expr)->op_first->op_type == OP_FLOP)
3519 {
3520 /* Basically turn for($x..$y) into the same as for($x,$y), but we
3521 * set the STACKED flag to indicate that these values are to be
3522 * treated as min/max values by 'pp_iterinit'.
3523 */
3524 UNOP* flip = (UNOP*)((UNOP*)((BINOP*)expr)->op_first)->op_first;
1a67a97c 3525 LOGOP* range = (LOGOP*) flip->op_first;
89ea2908
GA		 3526 OP* left = range->op_first;
3527 OP* right = left->op_sibling;
5152d7c7 3528 LISTOP* listop;
89ea2908
GA		 3529
3530 range->op_flags &= ~OPf_KIDS;
3531 range->op_first = Nullop;
3532
5152d7c7 3533 listop = (LISTOP*)newLISTOP(OP_LIST, 0, left, right);
1a67a97c
SM		 3534 listop->op_first->op_next = range->op_next;
3535 left->op_next = range->op_other;
5152d7c7
GS		 3536 right->op_next = (OP*)listop;
3537 listop->op_next = listop->op_first;
89ea2908
GA		 3538
3539 op_free(expr);
5152d7c7 3540 expr = (OP*)(listop);
89ea2908
GA		 3541 null(expr);
3542 iterflags |= OPf_STACKED;
3543 }
3544 else {
3545 expr = mod(force_list(expr), OP_GREPSTART);
3546 }
3547
3548
4633a7c4 3549 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
89ea2908 3550 append_elem(OP_LIST, expr, scalar(sv))));
85e6fe83 3551 assert(!loop->op_next);
b7dc083c
NIS		 3552#ifdef PL_OP_SLAB_ALLOC
3553 NewOp(1234,tmp,1,LOOP);
3554 Copy(loop,tmp,1,LOOP);
3555 loop = tmp;
3556#else
85e6fe83 3557 Renew(loop, 1, LOOP);
b7dc083c 3558#endif
85e6fe83 3559 loop->op_targ = padoff;
fb73857a 3560 wop = newWHILEOP(flags, 1, loop, forline, newOP(OP_ITER, 0), block, cont);
3280af22 3561 PL_copline = forline;
fb73857a 3562 return newSTATEOP(0, label, wop);
79072805
LW		 3563}
3564
8990e307 3565OP*
864dbfa3 3566Perl_newLOOPEX(pTHX_ I32 type, OP *label)
8990e307 3567{
11343788
MB		 3568 dTHR;
3569 OP *o;
2d8e6c8d
GS		 3570 STRLEN n_a;
3571
8990e307 3572 if (type != OP_GOTO || label->op_type == OP_CONST) {
cdaebead
MB		 3573 /* "last()" means "last" */
3574 if (label->op_type == OP_STUB && (label->op_flags & OPf_PARENS))
3575 o = newOP(type, OPf_SPECIAL);
3576 else {
3577 o = newPVOP(type, 0, savepv(label->op_type == OP_CONST
2d8e6c8d 3578 ? SvPVx(((SVOP*)label)->op_sv, n_a)
cdaebead
MB		 3579 : ""));
3580 }
8990e307
LW		 3581 op_free(label);
3582 }
3583 else {
a0d0e21e
LW		 3584 if (label->op_type == OP_ENTERSUB)
3585 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
11343788 3586 o = newUNOP(type, OPf_STACKED, label);
8990e307 3587 }
3280af22 3588 PL_hints |= HINT_BLOCK_SCOPE;
11343788 3589 return o;
8990e307
LW		 3590}
3591
79072805 3592void
864dbfa3 3593Perl_cv_undef(pTHX_ CV *cv)
79072805 3594{
11343788
MB		 3595 dTHR;
3596#ifdef USE_THREADS
e858de61
MB		 3597 if (CvMUTEXP(cv)) {
3598 MUTEX_DESTROY(CvMUTEXP(cv));
3599 Safefree(CvMUTEXP(cv));
3600 CvMUTEXP(cv) = 0;
3601 }
11343788
MB		 3602#endif /* USE_THREADS */
3603
a0d0e21e 3604 if (!CvXSUB(cv) && CvROOT(cv)) {
11343788
MB		 3605#ifdef USE_THREADS
3606 if (CvDEPTH(cv) || (CvOWNER(cv) && CvOWNER(cv) != thr))
cea2e8a9 3607 Perl_croak(aTHX_ "Can't undef active subroutine");
11343788 3608#else
a0d0e21e 3609 if (CvDEPTH(cv))
cea2e8a9 3610 Perl_croak(aTHX_ "Can't undef active subroutine");
11343788 3611#endif /* USE_THREADS */
8990e307 3612 ENTER;
a0d0e21e 3613
3280af22
NIS		 3614 SAVESPTR(PL_curpad);
3615 PL_curpad = 0;
a0d0e21e 3616
a5f75d66 3617 if (!CvCLONED(cv))
748a9306 3618 op_free(CvROOT(cv));
79072805 3619 CvROOT(cv) = Nullop;
8990e307 3620 LEAVE;
79072805 3621 }
1d5db326 3622 SvPOK_off((SV*)cv); /* forget prototype */
44a8e56a 3623 CvFLAGS(cv) = 0;
8e07c86e
AD		 3624 SvREFCNT_dec(CvGV(cv));
3625 CvGV(cv) = Nullgv;
3626 SvREFCNT_dec(CvOUTSIDE(cv));
3627 CvOUTSIDE(cv) = Nullcv;
3628 if (CvPADLIST(cv)) {
8ebc5c01 3629 /* may be during global destruction */
3630 if (SvREFCNT(CvPADLIST(cv))) {
93965878 3631 I32 i = AvFILLp(CvPADLIST(cv));
8ebc5c01 3632 while (i >= 0) {
3633 SV** svp = av_fetch(CvPADLIST(cv), i--, FALSE);
46fc3d4c 3634 SV* sv = svp ? *svp : Nullsv;
3635 if (!sv)
3636 continue;
3280af22
NIS		 3637 if (sv == (SV*)PL_comppad_name)
3638 PL_comppad_name = Nullav;
3639 else if (sv == (SV*)PL_comppad) {
3640 PL_comppad = Nullav;
3641 PL_curpad = Null(SV**);
46fc3d4c 3642 }
3643 SvREFCNT_dec(sv);
8ebc5c01 3644 }
3645 SvREFCNT_dec((SV*)CvPADLIST(cv));
8e07c86e 3646 }
8e07c86e
AD		 3647 CvPADLIST(cv) = Nullav;
3648 }
79072805
LW		 3649}
3650
5f05dabc 3651#ifdef DEBUG_CLOSURES
76e3520e 3652STATIC void
ba106d47 3653cv_dump(CV *cv)
5f05dabc 3654{
3655 CV *outside = CvOUTSIDE(cv);
3656 AV* padlist = CvPADLIST(cv);
4fdae800 3657 AV* pad_name;
3658 AV* pad;
3659 SV** pname;
3660 SV** ppad;
5f05dabc 3661 I32 ix;
3662
fb73857a 3663 PerlIO_printf(Perl_debug_log, "\tCV=0x%lx (%s), OUTSIDE=0x%lx (%s)\n",
ab50184a
CS		 3664 cv,
3665 (CvANON(cv) ? "ANON"
6b88bc9c 3666 : (cv == PL_main_cv) ? "MAIN"
33b8ce05 3667 : CvUNIQUE(cv) ? "UNIQUE"
44a8e56a 3668 : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
ab50184a
CS		 3669 outside,
3670 (!outside ? "null"
3671 : CvANON(outside) ? "ANON"
6b88bc9c 3672 : (outside == PL_main_cv) ? "MAIN"
07055b4c 3673 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 3674 : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
5f05dabc 3675
4fdae800 3676 if (!padlist)
3677 return;
3678
3679 pad_name = (AV*)*av_fetch(padlist, 0, FALSE);
3680 pad = (AV*)*av_fetch(padlist, 1, FALSE);
3681 pname = AvARRAY(pad_name);
3682 ppad = AvARRAY(pad);
3683
93965878 3684 for (ix = 1; ix <= AvFILLp(pad_name); ix++) {
5f05dabc 3685 if (SvPOK(pname[ix]))
fb73857a 3686 PerlIO_printf(Perl_debug_log, "\t%4d. 0x%lx (%s\"%s\" %ld-%ld)\n",
4fdae800 3687 ix, ppad[ix],
3688 SvFAKE(pname[ix]) ? "FAKE " : "",
3689 SvPVX(pname[ix]),
ab50184a
CS		 3690 (long)I_32(SvNVX(pname[ix])),
3691 (long)SvIVX(pname[ix]));
5f05dabc 3692 }
3693}
3694#endif /* DEBUG_CLOSURES */
3695
76e3520e 3696STATIC CV *
cea2e8a9 3697S_cv_clone2(pTHX_ CV *proto, CV *outside)
748a9306 3698{
11343788 3699 dTHR;
748a9306
LW		 3700 AV* av;
3701 I32 ix;
3702 AV* protopadlist = CvPADLIST(proto);
3703 AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE);
3704 AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE);
5f05dabc 3705 SV** pname = AvARRAY(protopad_name);
3706 SV** ppad = AvARRAY(protopad);
93965878
NIS		 3707 I32 fname = AvFILLp(protopad_name);
3708 I32 fpad = AvFILLp(protopad);
748a9306
LW		 3709 AV* comppadlist;
3710 CV* cv;
3711
07055b4c
CS		 3712 assert(!CvUNIQUE(proto));
3713
748a9306 3714 ENTER;
3280af22
NIS		 3715 SAVESPTR(PL_curpad);
3716 SAVESPTR(PL_comppad);
3717 SAVESPTR(PL_comppad_name);
3718 SAVESPTR(PL_compcv);
748a9306 3719
3280af22 3720 cv = PL_compcv = (CV*)NEWSV(1104,0);
fa83b5b6 3721 sv_upgrade((SV *)cv, SvTYPE(proto));
a5f75d66 3722 CvCLONED_on(cv);
5f05dabc 3723 if (CvANON(proto))
3724 CvANON_on(cv);
748a9306 3725
11343788 3726#ifdef USE_THREADS
12ca11f6 3727 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3728 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 3729 CvOWNER(cv) = 0;
3730#endif /* USE_THREADS */
748a9306 3731 CvFILEGV(cv) = CvFILEGV(proto);
44a8e56a 3732 CvGV(cv) = (GV*)SvREFCNT_inc(CvGV(proto));
748a9306
LW		 3733 CvSTASH(cv) = CvSTASH(proto);
3734 CvROOT(cv) = CvROOT(proto);
3735 CvSTART(cv) = CvSTART(proto);
5f05dabc 3736 if (outside)
3737 CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside);
748a9306 3738
68dc0745 3739 if (SvPOK(proto))
3740 sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto));
3741
3280af22 3742 PL_comppad_name = newAV();
46fc3d4c 3743 for (ix = fname; ix >= 0; ix--)
3280af22 3744 av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix]));
748a9306 3745
3280af22 3746 PL_comppad = newAV();
748a9306
LW		 3747
3748 comppadlist = newAV();
3749 AvREAL_off(comppadlist);
3280af22
NIS		 3750 av_store(comppadlist, 0, (SV*)PL_comppad_name);
3751 av_store(comppadlist, 1, (SV*)PL_comppad);
748a9306 3752 CvPADLIST(cv) = comppadlist;
3280af22
NIS		 3753 av_fill(PL_comppad, AvFILLp(protopad));
3754 PL_curpad = AvARRAY(PL_comppad);
748a9306
LW		 3755
3756 av = newAV(); /* will be @_ */
3757 av_extend(av, 0);
3280af22 3758 av_store(PL_comppad, 0, (SV*)av);
748a9306
LW		 3759 AvFLAGS(av) = AVf_REIFY;
3760
9607fc9c 3761 for (ix = fpad; ix > 0; ix--) {
3762 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
3280af22 3763 if (namesv && namesv != &PL_sv_undef) {
aa689395 3764 char *name = SvPVX(namesv); /* XXX */
3765 if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */
3766 I32 off = pad_findlex(name, ix, SvIVX(namesv),
2680586e 3767 CvOUTSIDE(cv), cxstack_ix, 0, 0);
5f05dabc 3768 if (!off)
3280af22 3769 PL_curpad[ix] = SvREFCNT_inc(ppad[ix]);
5f05dabc 3770 else if (off != ix)
cea2e8a9 3771 Perl_croak(aTHX_ "panic: cv_clone: %s", name);
748a9306
LW		 3772 }
3773 else { /* our own lexical */
aa689395 3774 SV* sv;
5f05dabc 3775 if (*name == '&') {
3776 /* anon code -- we'll come back for it */
3777 sv = SvREFCNT_inc(ppad[ix]);
3778 }
3779 else if (*name == '@')
3780 sv = (SV*)newAV();
748a9306 3781 else if (*name == '%')
5f05dabc 3782 sv = (SV*)newHV();
748a9306 3783 else
5f05dabc 3784 sv = NEWSV(0,0);
3785 if (!SvPADBUSY(sv))
3786 SvPADMY_on(sv);
3280af22 3787 PL_curpad[ix] = sv;
748a9306
LW		 3788 }
3789 }
3790 else {
aa689395 3791 SV* sv = NEWSV(0,0);
748a9306 3792 SvPADTMP_on(sv);
3280af22 3793 PL_curpad[ix] = sv;
748a9306
LW		 3794 }
3795 }
3796
5f05dabc 3797 /* Now that vars are all in place, clone nested closures. */
3798
9607fc9c 3799 for (ix = fpad; ix > 0; ix--) {
3800 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
aa689395 3801 if (namesv
3280af22 3802 && namesv != &PL_sv_undef
aa689395 3803 && !(SvFLAGS(namesv) & SVf_FAKE)
3804 && *SvPVX(namesv) == '&'
5f05dabc 3805 && CvCLONE(ppad[ix]))
3806 {
3807 CV *kid = cv_clone2((CV*)ppad[ix], cv);
3808 SvREFCNT_dec(ppad[ix]);
3809 CvCLONE_on(kid);
3810 SvPADMY_on(kid);
3280af22 3811 PL_curpad[ix] = (SV*)kid;
748a9306
LW		 3812 }
3813 }
3814
5f05dabc 3815#ifdef DEBUG_CLOSURES
ab50184a
CS		 3816 PerlIO_printf(Perl_debug_log, "Cloned inside:\n");
3817 cv_dump(outside);
3818 PerlIO_printf(Perl_debug_log, " from:\n");
5f05dabc 3819 cv_dump(proto);
ab50184a 3820 PerlIO_printf(Perl_debug_log, " to:\n");
5f05dabc 3821 cv_dump(cv);
3822#endif
3823
748a9306
LW		 3824 LEAVE;
3825 return cv;
3826}
3827
3828CV *
864dbfa3 3829Perl_cv_clone(pTHX_ CV *proto)
5f05dabc 3830{
b099ddc0
GS		 3831 CV *cv;
3832 MUTEX_LOCK(&PL_cred_mutex); /* XXX create separate mutex */
3833 cv = cv_clone2(proto, CvOUTSIDE(proto));
3834 MUTEX_UNLOCK(&PL_cred_mutex); /* XXX create separate mutex */
3835 return cv;
5f05dabc 3836}
3837
3fe9a6f1 3838void
864dbfa3 3839Perl_cv_ckproto(pTHX_ CV *cv, GV *gv, char *p)
3fe9a6f1 3840{
0453d815
PM		 3841 dTHR;
3842
3843 if (((!p != !SvPOK(cv)) || (p && strNE(p, SvPVX(cv)))) &&
3844 ckWARN_d(WARN_UNSAFE) ) {
46fc3d4c 3845 SV* msg = sv_newmortal();
3fe9a6f1 3846 SV* name = Nullsv;
3847
3848 if (gv)
46fc3d4c 3849 gv_efullname3(name = sv_newmortal(), gv, Nullch);
3850 sv_setpv(msg, "Prototype mismatch:");
3851 if (name)
cea2e8a9 3852 Perl_sv_catpvf(aTHX_ msg, " sub %_", name);
3fe9a6f1 3853 if (SvPOK(cv))
cea2e8a9 3854 Perl_sv_catpvf(aTHX_ msg, " (%s)", SvPVX(cv));
46fc3d4c 3855 sv_catpv(msg, " vs ");
3856 if (p)
cea2e8a9 3857 Perl_sv_catpvf(aTHX_ msg, "(%s)", p);
46fc3d4c 3858 else
3859 sv_catpv(msg, "none");
0453d815 3860 Perl_warner(aTHX_ WARN_UNSAFE, "%_", msg);
3fe9a6f1 3861 }
3862}
3863
760ac839 3864SV *
864dbfa3 3865Perl_cv_const_sv(pTHX_ CV *cv)
760ac839 3866{
54310121 3867 if (!cv || !SvPOK(cv) || SvCUR(cv))
3868 return Nullsv;
fe5e78ed
GS		 3869 return op_const_sv(CvSTART(cv), cv);
3870}
760ac839 3871
fe5e78ed 3872SV *
864dbfa3 3873Perl_op_const_sv(pTHX_ OP *o, CV *cv)
fe5e78ed
GS		 3874{
3875 SV *sv = Nullsv;
3876
3877 if(!o)
3878 return Nullsv;
3879
3880 if(o->op_type == OP_LINESEQ && cLISTOPo->op_first)
3881 o = cLISTOPo->op_first->op_sibling;
3882
3883 for (; o; o = o->op_next) {
54310121 3884 OPCODE type = o->op_type;
fe5e78ed
GS		 3885
3886 if(sv && o->op_next == o)
3887 return sv;
54310121 3888 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
3889 continue;
3890 if (type == OP_LEAVESUB || type == OP_RETURN)
3891 break;
3892 if (sv)
3893 return Nullsv;
3894 if (type == OP_CONST)
5dc0d613 3895 sv = cSVOPo->op_sv;
fe5e78ed 3896 else if (type == OP_PADSV && cv) {
e858de61
MB		 3897 AV* padav = (AV*)(AvARRAY(CvPADLIST(cv))[1]);
3898 sv = padav ? AvARRAY(padav)[o->op_targ] : Nullsv;
5aabfad6 3899 if (!sv || (!SvREADONLY(sv) && SvREFCNT(sv) > 1))
54310121 3900 return Nullsv;
760ac839 3901 }
54310121 3902 else
3903 return Nullsv;
760ac839 3904 }
5aabfad6 3905 if (sv)
3906 SvREADONLY_on(sv);
760ac839
LW		 3907 return sv;
3908}
3909
748a9306 3910CV *
864dbfa3 3911Perl_newSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *block)
79072805 3912{
11343788 3913 dTHR;
2d8e6c8d
GS		 3914 STRLEN n_a;
3915 char *name = o ? SvPVx(cSVOPo->op_sv, n_a) : Nullch;
55d729e4
GS		 3916 GV *gv = gv_fetchpv(name ? name : "__ANON__",
3917 GV_ADDMULTI | (block ? 0 : GV_NOINIT), SVt_PVCV);
2d8e6c8d 3918 char *ps = proto ? SvPVx(((SVOP*)proto)->op_sv, n_a) : Nullch;
a2008d6d 3919 register CV *cv=0;
a0d0e21e 3920 I32 ix;
79072805 3921
11343788 3922 if (o)
5dc0d613 3923 SAVEFREEOP(o);
3fe9a6f1 3924 if (proto)
3925 SAVEFREEOP(proto);
3926
55d729e4
GS		 3927 if (SvTYPE(gv) != SVt_PVGV) { /* Prototype now, and had
3928 maximum a prototype before. */
3929 if (SvTYPE(gv) > SVt_NULL) {
0453d815
PM		 3930 if (!SvPOK((SV*)gv) && !(SvIOK((SV*)gv) && SvIVX((SV*)gv) == -1)
3931 && ckWARN_d(WARN_UNSAFE))
3932 Perl_warner(aTHX_ WARN_UNSAFE, "Runaway prototype");
55d729e4
GS		 3933 cv_ckproto((CV*)gv, NULL, ps);
3934 }
3935 if (ps)
3936 sv_setpv((SV*)gv, ps);
3937 else
3938 sv_setiv((SV*)gv, -1);
3280af22
NIS		 3939 SvREFCNT_dec(PL_compcv);
3940 cv = PL_compcv = NULL;
3941 PL_sub_generation++;
55d729e4
GS		 3942 goto noblock;
3943 }
3944
68dc0745 3945 if (!name || GvCVGEN(gv))
3946 cv = Nullcv;
3947 else if (cv = GvCV(gv)) {
3fe9a6f1 3948 cv_ckproto(cv, gv, ps);
68dc0745 3949 /* already defined (or promised)? */
3950 if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
3951 SV* const_sv;
fe5e78ed 3952 bool const_changed = TRUE;
aa689395 3953 if (!block) {
3954 /* just a "sub foo;" when &foo is already defined */
3280af22 3955 SAVEFREESV(PL_compcv);
aa689395 3956 goto done;
3957 }
7bac28a0 3958 /* ahem, death to those who redefine active sort subs */
3280af22 3959 if (PL_curstackinfo->si_type == PERLSI_SORT && PL_sortcop == CvSTART(cv))
cea2e8a9 3960 Perl_croak(aTHX_ "Can't redefine active sort subroutine %s", name);
fe5e78ed
GS		 3961 if(const_sv = cv_const_sv(cv))
3962 const_changed = sv_cmp(const_sv, op_const_sv(block, Nullcv));
599cee73
PM		 3963 if ((const_sv && const_changed) || ckWARN(WARN_REDEFINE)
3964 && !(CvGV(cv) && GvSTASH(CvGV(cv))
2f34f9d4
IZ		 3965 && HvNAME(GvSTASH(CvGV(cv)))
3966 && strEQ(HvNAME(GvSTASH(CvGV(cv))),
3967 "autouse"))) {
3280af22
NIS		 3968 line_t oldline = PL_curcop->cop_line;
3969 PL_curcop->cop_line = PL_copline;
cea2e8a9 3970 Perl_warner(aTHX_ WARN_REDEFINE,
599cee73
PM		 3971 const_sv ? "Constant subroutine %s redefined"
3972 : "Subroutine %s redefined", name);
3280af22 3973 PL_curcop->cop_line = oldline;
79072805 3974 }
8990e307 3975 SvREFCNT_dec(cv);
68dc0745 3976 cv = Nullcv;
79072805
LW		 3977 }
3978 }
a0d0e21e 3979 if (cv) { /* must reuse cv if autoloaded */
4633a7c4 3980 cv_undef(cv);
3280af22
NIS		 3981 CvFLAGS(cv) = CvFLAGS(PL_compcv);
3982 CvOUTSIDE(cv) = CvOUTSIDE(PL_compcv);
3983 CvOUTSIDE(PL_compcv) = 0;
3984 CvPADLIST(cv) = CvPADLIST(PL_compcv);
3985 CvPADLIST(PL_compcv) = 0;
3986 if (SvREFCNT(PL_compcv) > 1) /* XXX Make closures transit through stub. */
3987 CvOUTSIDE(PL_compcv) = (CV*)SvREFCNT_inc((SV*)cv);
3988 SvREFCNT_dec(PL_compcv);
a0d0e21e
LW		 3989 }
3990 else {
3280af22 3991 cv = PL_compcv;
44a8e56a 3992 if (name) {
3993 GvCV(gv) = cv;
3994 GvCVGEN(gv) = 0;
3280af22 3995 PL_sub_generation++;
44a8e56a 3996 }
a0d0e21e 3997 }
44a8e56a 3998 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
3280af22
NIS		 3999 CvFILEGV(cv) = PL_curcop->cop_filegv;
4000 CvSTASH(cv) = PL_curstash;
11343788
MB		 4001#ifdef USE_THREADS
4002 CvOWNER(cv) = 0;
1cfa4ec7 4003 if (!CvMUTEXP(cv)) {
f6aaf501 4004 New(666, CvMUTEXP(cv), 1, perl_mutex);
1cfa4ec7
GS		 4005 MUTEX_INIT(CvMUTEXP(cv));
4006 }
11343788 4007#endif /* USE_THREADS */
8990e307 4008
3fe9a6f1 4009 if (ps)
4010 sv_setpv((SV*)cv, ps);
4633a7c4 4011
3280af22 4012 if (PL_error_count) {
c07a80fd 4013 op_free(block);
4014 block = Nullop;
68dc0745 4015 if (name) {
4016 char *s = strrchr(name, ':');
4017 s = s ? s+1 : name;
6d4c2119
CS		 4018 if (strEQ(s, "BEGIN")) {
4019 char *not_safe =
4020 "BEGIN not safe after errors--compilation aborted";
faef0170 4021 if (PL_in_eval & EVAL_KEEPERR)
cea2e8a9 4022 Perl_croak(aTHX_ not_safe);
6d4c2119
CS		 4023 else {
4024 /* force display of errors found but not reported */
38a03e6e 4025 sv_catpv(ERRSV, not_safe);
cea2e8a9 4026 Perl_croak(aTHX_ "%s", SvPVx(ERRSV, n_a));
6d4c2119
CS		 4027 }
4028 }
68dc0745 4029 }
c07a80fd 4030 }
a0d0e21e 4031 if (!block) {
55d729e4 4032 noblock:
3280af22 4033 PL_copline = NOLINE;
a0d0e21e
LW		 4034 LEAVE_SCOPE(floor);
4035 return cv;
4036 }
4037
3280af22
NIS		 4038 if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad))
4039 av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv);
a0d0e21e 4040
54310121 4041 if (CvCLONE(cv)) {
3280af22
NIS		 4042 SV **namep = AvARRAY(PL_comppad_name);
4043 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
54310121 4044 SV *namesv;
4045
3280af22 4046 if (SvIMMORTAL(PL_curpad[ix]))
54310121 4047 continue;
4048 /*
4049 * The only things that a clonable function needs in its
4050 * pad are references to outer lexicals and anonymous subs.
4051 * The rest are created anew during cloning.
4052 */
4053 if (!((namesv = namep[ix]) != Nullsv &&
3280af22 4054 namesv != &PL_sv_undef &&
54310121 4055 (SvFAKE(namesv) ||
4056 *SvPVX(namesv) == '&')))
4057 {
3280af22
NIS		 4058 SvREFCNT_dec(PL_curpad[ix]);
4059 PL_curpad[ix] = Nullsv;
54310121 4060 }
4061 }
a0d0e21e 4062 }
54310121 4063 else {
4064 AV *av = newAV(); /* Will be @_ */
4065 av_extend(av, 0);
3280af22 4066 av_store(PL_comppad, 0, (SV*)av);
54310121 4067 AvFLAGS(av) = AVf_REIFY;
79072805 4068
3280af22
NIS		 4069 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
4070 if (SvIMMORTAL(PL_curpad[ix]))
54310121 4071 continue;
3280af22
NIS		 4072 if (!SvPADMY(PL_curpad[ix]))
4073 SvPADTMP_on(PL_curpad[ix]);
54310121 4074 }
4075 }
79072805 4076
a0d0e21e 4077 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
79072805
LW		 4078 CvSTART(cv) = LINKLIST(CvROOT(cv));
4079 CvROOT(cv)->op_next = 0;
4080 peep(CvSTART(cv));
93a17b20 4081
44a8e56a 4082 if (name) {
4083 char *s;
4084
3280af22 4085 if (PERLDB_SUBLINE && PL_curstash != PL_debstash) {
46fc3d4c 4086 SV *sv = NEWSV(0,0);
44a8e56a 4087 SV *tmpstr = sv_newmortal();
549bb64a 4088 GV *db_postponed = gv_fetchpv("DB::postponed", GV_ADDMULTI, SVt_PVHV);
44a8e56a 4089 CV *cv;
4090 HV *hv;
4091
cea2e8a9 4092 Perl_sv_setpvf(aTHX_ sv, "%_:%ld-%ld",
3280af22
NIS		 4093 GvSV(PL_curcop->cop_filegv),
4094 (long)PL_subline, (long)PL_curcop->cop_line);
44a8e56a 4095 gv_efullname3(tmpstr, gv, Nullch);
3280af22 4096 hv_store(GvHV(PL_DBsub), SvPVX(tmpstr), SvCUR(tmpstr), sv, 0);
44a8e56a 4097 hv = GvHVn(db_postponed);
9607fc9c 4098 if (HvFILL(hv) > 0 && hv_exists(hv, SvPVX(tmpstr), SvCUR(tmpstr))
4099 && (cv = GvCV(db_postponed))) {
44a8e56a 4100 dSP;
924508f0 4101 PUSHMARK(SP);
44a8e56a 4102 XPUSHs(tmpstr);
4103 PUTBACK;
864dbfa3 4104 call_sv((SV*)cv, G_DISCARD);
44a8e56a 4105 }
4106 }
79072805 4107
44a8e56a 4108 if ((s = strrchr(name,':')))
28757baa 4109 s++;
4110 else
4111 s = name;
68dc0745 4112 if (strEQ(s, "BEGIN")) {
3280af22 4113 I32 oldscope = PL_scopestack_ix;
28757baa 4114 ENTER;
3280af22
NIS		 4115 SAVESPTR(PL_compiling.cop_filegv);
4116 SAVEI16(PL_compiling.cop_line);
4117 save_svref(&PL_rs);
4118 sv_setsv(PL_rs, PL_nrs);
28757baa 4119
3280af22
NIS		 4120 if (!PL_beginav)
4121 PL_beginav = newAV();
28757baa 4122 DEBUG_x( dump_sub(gv) );
3280af22 4123 av_push(PL_beginav, (SV *)cv);
28757baa 4124 GvCV(gv) = 0;
3280af22 4125 call_list(oldscope, PL_beginav);
a6006777 4126
3280af22 4127 PL_curcop = &PL_compiling;
a0ed51b3 4128 PL_compiling.op_private = PL_hints;
28757baa 4129 LEAVE;
4130 }
3280af22
NIS		 4131 else if (strEQ(s, "END") && !PL_error_count) {
4132 if (!PL_endav)
4133 PL_endav = newAV();
4134 av_unshift(PL_endav, 1);
4135 av_store(PL_endav, 0, (SV *)cv);
28757baa 4136 GvCV(gv) = 0;
4137 }
3280af22
NIS		 4138 else if (strEQ(s, "INIT") && !PL_error_count) {
4139 if (!PL_initav)
4140 PL_initav = newAV();
4141 av_push(PL_initav, SvREFCNT_inc(cv));
b7aad4fe 4142 GvCV(gv) = 0;
ae77835f 4143 }
79072805 4144 }
a6006777 4145
aa689395 4146 done:
3280af22 4147 PL_copline = NOLINE;
8990e307 4148 LEAVE_SCOPE(floor);
a0d0e21e 4149 return cv;
79072805
LW		 4150}
4151
b099ddc0 4152/* XXX unsafe for threads if eval_owner isn't held */
5476c433 4153void
864dbfa3 4154Perl_newCONSTSUB(pTHX_ HV *stash, char *name, SV *sv)
5476c433
JD		 4155{
4156 dTHR;
3280af22
NIS		 4157 U32 oldhints = PL_hints;
4158 HV *old_cop_stash = PL_curcop->cop_stash;
4159 HV *old_curstash = PL_curstash;
4160 line_t oldline = PL_curcop->cop_line;
4161 PL_curcop->cop_line = PL_copline;
5476c433 4162
3280af22 4163 PL_hints &= ~HINT_BLOCK_SCOPE;
5476c433 4164 if(stash)
3280af22 4165 PL_curstash = PL_curcop->cop_stash = stash;
5476c433
JD		 4166
4167 newSUB(
be24f278 4168 start_subparse(FALSE, 0),
5476c433 4169 newSVOP(OP_CONST, 0, newSVpv(name,0)),
6b88bc9c 4170 newSVOP(OP_CONST, 0, &PL_sv_no), /* SvPV(&PL_sv_no) == "" -- GMB */
5476c433
JD		 4171 newSTATEOP(0, Nullch, newSVOP(OP_CONST, 0, sv))
4172 );
4173
3280af22
NIS		 4174 PL_hints = oldhints;
4175 PL_curcop->cop_stash = old_cop_stash;
4176 PL_curstash = old_curstash;
4177 PL_curcop->cop_line = oldline;
5476c433
JD		 4178}
4179
57d3b86d 4180CV *
864dbfa3 4181Perl_newXS(pTHX_ char *name, XSUBADDR_t subaddr, char *filename)
a0d0e21e 4182{
11343788 4183 dTHR;
44a8e56a 4184 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
79072805 4185 register CV *cv;
44a8e56a 4186
4187 if (cv = (name ? GvCV(gv) : Nullcv)) {
4188 if (GvCVGEN(gv)) {
4189 /* just a cached method */
4190 SvREFCNT_dec(cv);
4191 cv = 0;
4192 }
4193 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
4194 /* already defined (or promised) */
599cee73 4195 if (ckWARN(WARN_REDEFINE) && !(CvGV(cv) && GvSTASH(CvGV(cv))
2f34f9d4
IZ		 4196 && HvNAME(GvSTASH(CvGV(cv)))
4197 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "autouse"))) {
3280af22 4198 line_t oldline = PL_curcop->cop_line;
51f6edd3
GS		 4199 if (PL_copline != NOLINE)
4200 PL_curcop->cop_line = PL_copline;
cea2e8a9 4201 Perl_warner(aTHX_ WARN_REDEFINE, "Subroutine %s redefined",name);
3280af22 4202 PL_curcop->cop_line = oldline;
a0d0e21e
LW		 4203 }
4204 SvREFCNT_dec(cv);
4205 cv = 0;
79072805 4206 }
79072805 4207 }
44a8e56a 4208
4209 if (cv) /* must reuse cv if autoloaded */
4210 cv_undef(cv);
a0d0e21e
LW		 4211 else {
4212 cv = (CV*)NEWSV(1105,0);
4213 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 4214 if (name) {
4215 GvCV(gv) = cv;
4216 GvCVGEN(gv) = 0;
3280af22 4217 PL_sub_generation++;
44a8e56a 4218 }
a0d0e21e 4219 }
5196be3e 4220 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
11343788 4221#ifdef USE_THREADS
12ca11f6 4222 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 4223 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 4224 CvOWNER(cv) = 0;
4225#endif /* USE_THREADS */
79072805 4226 CvFILEGV(cv) = gv_fetchfile(filename);
a0d0e21e 4227 CvXSUB(cv) = subaddr;
44a8e56a 4228
28757baa 4229 if (name) {
4230 char *s = strrchr(name,':');
4231 if (s)
4232 s++;
4233 else
4234 s = name;
4235 if (strEQ(s, "BEGIN")) {
3280af22
NIS		 4236 if (!PL_beginav)
4237 PL_beginav = newAV();
4238 av_push(PL_beginav, (SV *)cv);
44a8e56a 4239 GvCV(gv) = 0;
28757baa 4240 }
4241 else if (strEQ(s, "END")) {
3280af22
NIS		 4242 if (!PL_endav)
4243 PL_endav = newAV();
4244 av_unshift(PL_endav, 1);
4245 av_store(PL_endav, 0, (SV *)cv);
44a8e56a 4246 GvCV(gv) = 0;
28757baa 4247 }
7d07dbc2 4248 else if (strEQ(s, "INIT")) {
3280af22
NIS		 4249 if (!PL_initav)
4250 PL_initav = newAV();
4251 av_push(PL_initav, (SV *)cv);
f8f842e4 4252 GvCV(gv) = 0;
ae77835f 4253 }
28757baa 4254 }
8990e307 4255 else
a5f75d66 4256 CvANON_on(cv);
44a8e56a 4257
a0d0e21e 4258 return cv;
79072805
LW		 4259}
4260
4261void
864dbfa3 4262Perl_newFORM(pTHX_ I32 floor, OP *o, OP *block)
79072805 4263{
11343788 4264 dTHR;
79072805
LW		 4265 register CV *cv;
4266 char *name;
4267 GV *gv;
a0d0e21e 4268 I32 ix;
2d8e6c8d 4269 STRLEN n_a;
79072805 4270
11343788 4271 if (o)
2d8e6c8d 4272 name = SvPVx(cSVOPo->op_sv, n_a);
79072805
LW		 4273 else
4274 name = "STDOUT";
85e6fe83 4275 gv = gv_fetchpv(name,TRUE, SVt_PVFM);
a5f75d66 4276 GvMULTI_on(gv);
79072805 4277 if (cv = GvFORM(gv)) {
599cee73 4278 if (ckWARN(WARN_REDEFINE)) {
3280af22 4279 line_t oldline = PL_curcop->cop_line;
79072805 4280
3280af22 4281 PL_curcop->cop_line = PL_copline;
cea2e8a9 4282 Perl_warner(aTHX_ WARN_REDEFINE, "Format %s redefined",name);
3280af22 4283 PL_curcop->cop_line = oldline;
79072805 4284 }
8990e307 4285 SvREFCNT_dec(cv);
79072805 4286 }
3280af22 4287 cv = PL_compcv;
79072805 4288 GvFORM(gv) = cv;
44a8e56a 4289 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
3280af22 4290 CvFILEGV(cv) = PL_curcop->cop_filegv;
79072805 4291
3280af22
NIS		 4292 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
4293 if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix]))
4294 SvPADTMP_on(PL_curpad[ix]);
a0d0e21e
LW		 4295 }
4296
79072805
LW		 4297 CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
4298 CvSTART(cv) = LINKLIST(CvROOT(cv));
4299 CvROOT(cv)->op_next = 0;
4300 peep(CvSTART(cv));
11343788 4301 op_free(o);
3280af22 4302 PL_copline = NOLINE;
8990e307 4303 LEAVE_SCOPE(floor);
79072805
LW		 4304}
4305
4306OP *
864dbfa3 4307Perl_newANONLIST(pTHX_ OP *o)
79072805 4308{
93a17b20 4309 return newUNOP(OP_REFGEN, 0,
11343788 4310 mod(list(convert(OP_ANONLIST, 0, o)), OP_REFGEN));
79072805
LW		 4311}
4312
4313OP *
864dbfa3 4314Perl_newANONHASH(pTHX_ OP *o)
79072805 4315{
93a17b20 4316 return newUNOP(OP_REFGEN, 0,
11343788 4317 mod(list(convert(OP_ANONHASH, 0, o)), OP_REFGEN));
a0d0e21e
LW		 4318}
4319
4320OP *
864dbfa3 4321Perl_newANONSUB(pTHX_ I32 floor, OP *proto, OP *block)
a0d0e21e
LW		 4322{
4323 return newUNOP(OP_REFGEN, 0,
4633a7c4 4324 newSVOP(OP_ANONCODE, 0, (SV*)newSUB(floor, 0, proto, block)));
79072805
LW		 4325}
4326
4327OP *
864dbfa3 4328Perl_oopsAV(pTHX_ OP *o)
79072805 4329{
ed6116ce
LW		 4330 switch (o->op_type) {
4331 case OP_PADSV:
4332 o->op_type = OP_PADAV;
22c35a8c 4333 o->op_ppaddr = PL_ppaddr[OP_PADAV];
51e247a3 4334 return ref(o, OP_RV2AV);
ed6116ce
LW		 4335
4336 case OP_RV2SV:
79072805 4337 o->op_type = OP_RV2AV;
22c35a8c 4338 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
79072805 4339 ref(o, OP_RV2AV);
ed6116ce
LW		 4340 break;
4341
4342 default:
0453d815
PM		 4343 if (ckWARN_d(WARN_INTERNAL))
4344 Perl_warner(aTHX_ WARN_INTERNAL, "oops: oopsAV");
ed6116ce
LW		 4345 break;
4346 }
79072805
LW		 4347 return o;
4348}
4349
4350OP *
864dbfa3 4351Perl_oopsHV(pTHX_ OP *o)
79072805 4352{
0453d815
PM		 4353 dTHR;
4354
4355 dTHR;
4356
ed6116ce
LW		 4357 switch (o->op_type) {
4358 case OP_PADSV:
4359 case OP_PADAV:
4360 o->op_type = OP_PADHV;
22c35a8c 4361 o->op_ppaddr = PL_ppaddr[OP_PADHV];
51e247a3 4362 return ref(o, OP_RV2HV);
ed6116ce
LW		 4363
4364 case OP_RV2SV:
4365 case OP_RV2AV:
79072805 4366 o->op_type = OP_RV2HV;
22c35a8c 4367 o->op_ppaddr = PL_ppaddr[OP_RV2HV];
79072805 4368 ref(o, OP_RV2HV);
ed6116ce
LW		 4369 break;
4370
4371 default:
0453d815
PM		 4372 if (ckWARN_d(WARN_INTERNAL))
4373 Perl_warner(aTHX_ WARN_INTERNAL, "oops: oopsHV");
ed6116ce
LW		 4374 break;
4375 }
79072805
LW		 4376 return o;
4377}
4378
4379OP *
864dbfa3 4380Perl_newAVREF(pTHX_ OP *o)
79072805 4381{
ed6116ce
LW		 4382 if (o->op_type == OP_PADANY) {
4383 o->op_type = OP_PADAV;
22c35a8c 4384 o->op_ppaddr = PL_ppaddr[OP_PADAV];
93a17b20 4385 return o;
ed6116ce 4386 }
79072805
LW		 4387 return newUNOP(OP_RV2AV, 0, scalar(o));
4388}
4389
4390OP *
864dbfa3 4391Perl_newGVREF(pTHX_ I32 type, OP *o)
79072805 4392{
82092f1d 4393 if (type == OP_MAPSTART || type == OP_GREPSTART || type == OP_SORT)
a0d0e21e 4394 return newUNOP(OP_NULL, 0, o);
748a9306 4395 return ref(newUNOP(OP_RV2GV, OPf_REF, o), type);
79072805
LW		 4396}
4397
4398OP *
864dbfa3 4399Perl_newHVREF(pTHX_ OP *o)
79072805 4400{
ed6116ce
LW		 4401 if (o->op_type == OP_PADANY) {
4402 o->op_type = OP_PADHV;
22c35a8c 4403 o->op_ppaddr = PL_ppaddr[OP_PADHV];
93a17b20 4404 return o;
ed6116ce 4405 }
79072805
LW		 4406 return newUNOP(OP_RV2HV, 0, scalar(o));
4407}
4408
4409OP *
864dbfa3 4410Perl_oopsCV(pTHX_ OP *o)
79072805 4411{
cea2e8a9 4412 Perl_croak(aTHX_ "NOT IMPL LINE %d",__LINE__);
79072805
LW		 4413 /* STUB */
4414 return o;
4415}
4416
4417OP *
864dbfa3 4418Perl_newCVREF(pTHX_ I32 flags, OP *o)
79072805 4419{
c07a80fd 4420 return newUNOP(OP_RV2CV, flags, scalar(o));
79072805
LW		 4421}
4422
4423OP *
864dbfa3 4424Perl_newSVREF(pTHX_ OP *o)
79072805 4425{
ed6116ce
LW		 4426 if (o->op_type == OP_PADANY) {
4427 o->op_type = OP_PADSV;
22c35a8c 4428 o->op_ppaddr = PL_ppaddr[OP_PADSV];
93a17b20 4429 return o;
ed6116ce 4430 }
224a4551
MB		 4431 else if (o->op_type == OP_THREADSV && !(o->op_flags & OPpDONE_SVREF)) {
4432 o->op_flags |= OPpDONE_SVREF;
a863c7d1 4433 return o;
224a4551 4434 }
79072805
LW		 4435 return newUNOP(OP_RV2SV, 0, scalar(o));
4436}
4437
4438/* Check routines. */
4439
4440OP *
cea2e8a9 4441Perl_ck_anoncode(pTHX_ OP *o)
5f05dabc 4442{
178c6305
CS		 4443 PADOFFSET ix;
4444 SV* name;
4445
4446 name = NEWSV(1106,0);
4447 sv_upgrade(name, SVt_PVNV);
4448 sv_setpvn(name, "&", 1);
4449 SvIVX(name) = -1;
4450 SvNVX(name) = 1;
5dc0d613 4451 ix = pad_alloc(o->op_type, SVs_PADMY);
3280af22
NIS		 4452 av_store(PL_comppad_name, ix, name);
4453 av_store(PL_comppad, ix, cSVOPo->op_sv);
5dc0d613
MB		 4454 SvPADMY_on(cSVOPo->op_sv);
4455 cSVOPo->op_sv = Nullsv;
4456 cSVOPo->op_targ = ix;
4457 return o;
5f05dabc 4458}
4459
4460OP *
cea2e8a9 4461Perl_ck_bitop(pTHX_ OP *o)
55497cff 4462{
3280af22 4463 o->op_private = PL_hints;
5dc0d613 4464 return o;
55497cff 4465}
4466
4467OP *
cea2e8a9 4468Perl_ck_concat(pTHX_ OP *o)
79072805 4469{
11343788
MB		 4470 if (cUNOPo->op_first->op_type == OP_CONCAT)
4471 o->op_flags |= OPf_STACKED;
4472 return o;
79072805
LW		 4473}
4474
4475OP *
cea2e8a9 4476Perl_ck_spair(pTHX_ OP *o)
79072805 4477{
11343788 4478 if (o->op_flags & OPf_KIDS) {
79072805 4479 OP* newop;
a0d0e21e 4480 OP* kid;
5dc0d613
MB		 4481 OPCODE type = o->op_type;
4482 o = modkids(ck_fun(o), type);
11343788 4483 kid = cUNOPo->op_first;
a0d0e21e
LW		 4484 newop = kUNOP->op_first->op_sibling;
4485 if (newop &&
4486 (newop->op_sibling ||
22c35a8c 4487 !(PL_opargs[newop->op_type] & OA_RETSCALAR) ||
a0d0e21e
LW		 4488 newop->op_type == OP_PADAV || newop->op_type == OP_PADHV ||
4489 newop->op_type == OP_RV2AV || newop->op_type == OP_RV2HV)) {
aeea060c 4490
11343788 4491 return o;
a0d0e21e
LW		 4492 }
4493 op_free(kUNOP->op_first);
4494 kUNOP->op_first = newop;
4495 }
22c35a8c 4496 o->op_ppaddr = PL_ppaddr[++o->op_type];
11343788 4497 return ck_fun(o);
a0d0e21e
LW		 4498}
4499
4500OP *
cea2e8a9 4501Perl_ck_delete(pTHX_ OP *o)
a0d0e21e 4502{
11343788 4503 o = ck_fun(o);
5dc0d613 4504 o->op_private = 0;
11343788
MB		 4505 if (o->op_flags & OPf_KIDS) {
4506 OP *kid = cUNOPo->op_first;
5f05dabc 4507 if (kid->op_type == OP_HSLICE)
5dc0d613 4508 o->op_private |= OPpSLICE;
5f05dabc 4509 else if (kid->op_type != OP_HELEM)
cea2e8a9 4510 Perl_croak(aTHX_ "%s argument is not a HASH element or slice",
22c35a8c 4511 PL_op_desc[o->op_type]);
a0d0e21e 4512 null(kid);
79072805 4513 }
11343788 4514 return o;
79072805
LW		 4515}
4516
4517OP *
cea2e8a9 4518Perl_ck_eof(pTHX_ OP *o)
79072805 4519{
11343788 4520 I32 type = o->op_type;
79072805 4521
11343788
MB		 4522 if (o->op_flags & OPf_KIDS) {
4523 if (cLISTOPo->op_first->op_type == OP_STUB) {
4524 op_free(o);
4525 o = newUNOP(type, OPf_SPECIAL,
d58bf5aa 4526 newGVOP(OP_GV, 0, gv_fetchpv("main::ARGV", TRUE, SVt_PVAV)));
8990e307 4527 }
11343788 4528 return ck_fun(o);
79072805 4529 }
11343788 4530 return o;
79072805
LW		 4531}
4532
4533OP *
cea2e8a9 4534Perl_ck_eval(pTHX_ OP *o)
79072805 4535{
3280af22 4536 PL_hints |= HINT_BLOCK_SCOPE;
11343788
MB		 4537 if (o->op_flags & OPf_KIDS) {
4538 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 4539
93a17b20 4540 if (!kid) {
11343788
MB		 4541 o->op_flags &= ~OPf_KIDS;
4542 null(o);
79072805
LW		 4543 }
4544 else if (kid->op_type == OP_LINESEQ) {
4545 LOGOP *enter;
4546
11343788
MB		 4547 kid->op_next = o->op_next;
4548 cUNOPo->op_first = 0;
4549 op_free(o);
79072805 4550
b7dc083c 4551 NewOp(1101, enter, 1, LOGOP);
79072805 4552 enter->op_type = OP_ENTERTRY;
22c35a8c 4553 enter->op_ppaddr = PL_ppaddr[OP_ENTERTRY];
79072805
LW		 4554 enter->op_private = 0;
4555
4556 /* establish postfix order */
4557 enter->op_next = (OP*)enter;
4558
11343788
MB		 4559 o = prepend_elem(OP_LINESEQ, (OP*)enter, (OP*)kid);
4560 o->op_type = OP_LEAVETRY;
22c35a8c 4561 o->op_ppaddr = PL_ppaddr[OP_LEAVETRY];
11343788
MB		 4562 enter->op_other = o;
4563 return o;
79072805 4564 }
c7cc6f1c 4565 else
473986ff 4566 scalar((OP*)kid);
79072805
LW		 4567 }
4568 else {
11343788 4569 op_free(o);
54b9620d 4570 o = newUNOP(OP_ENTEREVAL, 0, newDEFSVOP());
79072805 4571 }
3280af22 4572 o->op_targ = (PADOFFSET)PL_hints;
11343788 4573 return o;
79072805
LW		 4574}
4575
4576OP *
cea2e8a9 4577Perl_ck_exec(pTHX_ OP *o)
79072805
LW		 4578{
4579 OP *kid;
11343788
MB		 4580 if (o->op_flags & OPf_STACKED) {
4581 o = ck_fun(o);
4582 kid = cUNOPo->op_first->op_sibling;
8990e307
LW		 4583 if (kid->op_type == OP_RV2GV)
4584 null(kid);
79072805 4585 }
463ee0b2 4586 else
11343788
MB		 4587 o = listkids(o);
4588 return o;
79072805
LW		 4589}
4590
4591OP *
cea2e8a9 4592Perl_ck_exists(pTHX_ OP *o)
5f05dabc 4593{
5196be3e
MB		 4594 o = ck_fun(o);
4595 if (o->op_flags & OPf_KIDS) {
4596 OP *kid = cUNOPo->op_first;
5f05dabc 4597 if (kid->op_type != OP_HELEM)
cea2e8a9 4598 Perl_croak(aTHX_ "%s argument is not a HASH element", PL_op_desc[o->op_type]);
5f05dabc 4599 null(kid);
4600 }
5196be3e 4601 return o;
5f05dabc 4602}
4603
22c35a8c 4604#if 0
5f05dabc 4605OP *
cea2e8a9 4606Perl_ck_gvconst(pTHX_ register OP *o)
79072805
LW		 4607{
4608 o = fold_constants(o);
4609 if (o->op_type == OP_CONST)
4610 o->op_type = OP_GV;
4611 return o;
4612}
22c35a8c 4613#endif
79072805
LW		 4614
4615OP *
cea2e8a9 4616Perl_ck_rvconst(pTHX_ register OP *o)
79072805 4617{
11343788
MB		 4618 dTHR;
4619 SVOP *kid = (SVOP*)cUNOPo->op_first;
85e6fe83 4620
3280af22 4621 o->op_private |= (PL_hints & HINT_STRICT_REFS);
79072805 4622 if (kid->op_type == OP_CONST) {
44a8e56a 4623 char *name;
4624 int iscv;
4625 GV *gv;
779c5bc9 4626 SV *kidsv = kid->op_sv;
2d8e6c8d 4627 STRLEN n_a;
44a8e56a 4628
779c5bc9
GS		 4629 /* Is it a constant from cv_const_sv()? */
4630 if (SvROK(kidsv) && SvREADONLY(kidsv)) {
4631 SV *rsv = SvRV(kidsv);
4632 int svtype = SvTYPE(rsv);
4633 char *badtype = Nullch;
4634
4635 switch (o->op_type) {
4636 case OP_RV2SV:
4637 if (svtype > SVt_PVMG)
4638 badtype = "a SCALAR";
4639 break;
4640 case OP_RV2AV:
4641 if (svtype != SVt_PVAV)
4642 badtype = "an ARRAY";
4643 break;
4644 case OP_RV2HV:
4645 if (svtype != SVt_PVHV) {
4646 if (svtype == SVt_PVAV) { /* pseudohash? */
4647 SV **ksv = av_fetch((AV*)rsv, 0, FALSE);
4648 if (ksv && SvROK(*ksv)
4649 && SvTYPE(SvRV(*ksv)) == SVt_PVHV)
4650 {
4651 break;
4652 }
4653 }
4654 badtype = "a HASH";
4655 }
4656 break;
4657 case OP_RV2CV:
4658 if (svtype != SVt_PVCV)
4659 badtype = "a CODE";
4660 break;
4661 }
4662 if (badtype)
cea2e8a9 4663 Perl_croak(aTHX_ "Constant is not %s reference", badtype);
779c5bc9
GS		 4664 return o;
4665 }
2d8e6c8d 4666 name = SvPV(kidsv, n_a);
3280af22 4667 if ((PL_hints & HINT_STRICT_REFS) && (kid->op_private & OPpCONST_BARE)) {
44a8e56a 4668 char *badthing = Nullch;
5dc0d613 4669 switch (o->op_type) {
44a8e56a 4670 case OP_RV2SV:
4671 badthing = "a SCALAR";
4672 break;
4673 case OP_RV2AV:
4674 badthing = "an ARRAY";
4675 break;
4676 case OP_RV2HV:
4677 badthing = "a HASH";
4678 break;
4679 }
4680 if (badthing)
cea2e8a9 4681 Perl_croak(aTHX_
44a8e56a 4682 "Can't use bareword (\"%s\") as %s ref while \"strict refs\" in use",
4683 name, badthing);
4684 }
93233ece
CS		 4685 /*
4686 * This is a little tricky. We only want to add the symbol if we
4687 * didn't add it in the lexer. Otherwise we get duplicate strict
4688 * warnings. But if we didn't add it in the lexer, we must at
4689 * least pretend like we wanted to add it even if it existed before,
4690 * or we get possible typo warnings. OPpCONST_ENTERED says
4691 * whether the lexer already added THIS instance of this symbol.
4692 */
5196be3e 4693 iscv = (o->op_type == OP_RV2CV) * 2;
93233ece 4694 do {
44a8e56a 4695 gv = gv_fetchpv(name,
748a9306 4696 iscv | !(kid->op_private & OPpCONST_ENTERED),
a0d0e21e
LW		 4697 iscv
4698 ? SVt_PVCV
11343788 4699 : o->op_type == OP_RV2SV
a0d0e21e 4700 ? SVt_PV
11343788 4701 : o->op_type == OP_RV2AV
a0d0e21e 4702 ? SVt_PVAV
11343788 4703 : o->op_type == OP_RV2HV
a0d0e21e
LW		 4704 ? SVt_PVHV
4705 : SVt_PVGV);
93233ece
CS		 4706 } while (!gv && !(kid->op_private & OPpCONST_ENTERED) && !iscv++);
4707 if (gv) {
4708 kid->op_type = OP_GV;
4709 SvREFCNT_dec(kid->op_sv);
4710 kid->op_sv = SvREFCNT_inc(gv);
a0d0e21e 4711 }
79072805 4712 }
11343788 4713 return o;
79072805
LW		 4714}
4715
4716OP *
cea2e8a9 4717Perl_ck_ftst(pTHX_ OP *o)
79072805 4718{
11343788
MB		 4719 dTHR;
4720 I32 type = o->op_type;
79072805 4721
11343788
MB		 4722 if (o->op_flags & OPf_REF)
4723 return o;
79072805 4724
108ed793 4725 if (o->op_flags & OPf_KIDS && cUNOPo->op_first->op_type != OP_STUB) {
11343788 4726 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805
LW		 4727
4728 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
2d8e6c8d 4729 STRLEN n_a;
a0d0e21e 4730 OP *newop = newGVOP(type, OPf_REF,
2d8e6c8d 4731 gv_fetchpv(SvPVx(kid->op_sv, n_a), TRUE, SVt_PVIO));
11343788 4732 op_free(o);
79072805
LW		 4733 return newop;
4734 }
4735 }
4736 else {
11343788 4737 op_free(o);
79072805 4738 if (type == OP_FTTTY)
fb73857a 4739 return newGVOP(type, OPf_REF, gv_fetchpv("main::STDIN", TRUE,
85e6fe83 4740 SVt_PVIO));
79072805 4741 else
54b9620d 4742 return newUNOP(type, 0, newDEFSVOP());
79072805 4743 }
11343788 4744 return o;
79072805
LW		 4745}
4746
4747OP *
cea2e8a9 4748Perl_ck_fun(pTHX_ OP *o)
79072805 4749{
11343788 4750 dTHR;
79072805
LW		 4751 register OP *kid;
4752 OP **tokid;
4753 OP *sibl;
4754 I32 numargs = 0;
11343788 4755 int type = o->op_type;
22c35a8c 4756 register I32 oa = PL_opargs[type] >> OASHIFT;
aeea060c 4757
11343788 4758 if (o->op_flags & OPf_STACKED) {
79072805
LW		 4759 if ((oa & OA_OPTIONAL) && (oa >> 4) && !((oa >> 4) & OA_OPTIONAL))
4760 oa &= ~OA_OPTIONAL;
4761 else
11343788 4762 return no_fh_allowed(o);
79072805
LW		 4763 }
4764
11343788 4765 if (o->op_flags & OPf_KIDS) {
2d8e6c8d 4766 STRLEN n_a;
11343788
MB		 4767 tokid = &cLISTOPo->op_first;
4768 kid = cLISTOPo->op_first;
8990e307
LW		 4769 if (kid->op_type == OP_PUSHMARK ||
4770 kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK)
4771 {
79072805
LW		 4772 tokid = &kid->op_sibling;
4773 kid = kid->op_sibling;
4774 }
22c35a8c 4775 if (!kid && PL_opargs[type] & OA_DEFGV)
54b9620d 4776 *tokid = kid = newDEFSVOP();
79072805
LW		 4777
4778 while (oa && kid) {
4779 numargs++;
4780 sibl = kid->op_sibling;
4781 switch (oa & 7) {
4782 case OA_SCALAR:
62c18ce2
GS		 4783 /* list seen where single (scalar) arg expected? */
4784 if (numargs == 1 && !(oa >> 4)
4785 && kid->op_type == OP_LIST && type != OP_SCALAR)
4786 {
4787 return too_many_arguments(o,PL_op_desc[type]);
4788 }
79072805
LW		 4789 scalar(kid);
4790 break;
4791 case OA_LIST:
4792 if (oa < 16) {
4793 kid = 0;
4794 continue;
4795 }
4796 else
4797 list(kid);
4798 break;
4799 case OA_AVREF:
4800 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 4801 (kid->op_private & OPpCONST_BARE))
4802 {
2d8e6c8d 4803 char *name = SvPVx(((SVOP*)kid)->op_sv, n_a);
79072805 4804 OP *newop = newAVREF(newGVOP(OP_GV, 0,
85e6fe83 4805 gv_fetchpv(name, TRUE, SVt_PVAV) ));
599cee73 4806 if (ckWARN(WARN_SYNTAX))
cea2e8a9 4807 Perl_warner(aTHX_ WARN_SYNTAX,
599cee73 4808 "Array @%s missing the @ in argument %ld of %s()",
22c35a8c 4809 name, (long)numargs, PL_op_desc[type]);
79072805
LW		 4810 op_free(kid);
4811 kid = newop;
4812 kid->op_sibling = sibl;
4813 *tokid = kid;
4814 }
8990e307 4815 else if (kid->op_type != OP_RV2AV && kid->op_type != OP_PADAV)
35cd451c 4816 bad_type(numargs, "array", PL_op_desc[type], kid);
a0d0e21e 4817 mod(kid, type);
79072805
LW		 4818 break;
4819 case OA_HVREF:
4820 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 4821 (kid->op_private & OPpCONST_BARE))
4822 {
2d8e6c8d 4823 char *name = SvPVx(((SVOP*)kid)->op_sv, n_a);
79072805 4824 OP *newop = newHVREF(newGVOP(OP_GV, 0,
85e6fe83 4825 gv_fetchpv(name, TRUE, SVt_PVHV) ));
599cee73 4826 if (ckWARN(WARN_SYNTAX))
cea2e8a9 4827 Perl_warner(aTHX_ WARN_SYNTAX,
599cee73 4828 "Hash %%%s missing the %% in argument %ld of %s()",
22c35a8c 4829 name, (long)numargs, PL_op_desc[type]);
79072805
LW		 4830 op_free(kid);
4831 kid = newop;
4832 kid->op_sibling = sibl;
4833 *tokid = kid;
4834 }
8990e307 4835 else if (kid->op_type != OP_RV2HV && kid->op_type != OP_PADHV)
35cd451c 4836 bad_type(numargs, "hash", PL_op_desc[type], kid);
a0d0e21e 4837 mod(kid, type);
79072805
LW		 4838 break;
4839 case OA_CVREF:
4840 {
a0d0e21e 4841 OP *newop = newUNOP(OP_NULL, 0, kid);
79072805
LW		 4842 kid->op_sibling = 0;
4843 linklist(kid);
4844 newop->op_next = newop;
4845 kid = newop;
4846 kid->op_sibling = sibl;
4847 *tokid = kid;
4848 }
4849 break;
4850 case OA_FILEREF:
c340be78 4851 if (kid->op_type != OP_GV && kid->op_type != OP_RV2GV) {
79072805 4852 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 4853 (kid->op_private & OPpCONST_BARE))
4854 {
79072805 4855 OP *newop = newGVOP(OP_GV, 0,
2d8e6c8d 4856 gv_fetchpv(SvPVx(((SVOP*)kid)->op_sv, n_a), TRUE,
85e6fe83 4857 SVt_PVIO) );
79072805
LW		 4858 op_free(kid);
4859 kid = newop;
4860 }
1ea32a52
GS		 4861 else if (kid->op_type == OP_READLINE) {
4862 /* neophyte patrol: open(<FH>), close(<FH>) etc. */
4863 bad_type(numargs, "HANDLE", PL_op_desc[o->op_type], kid);
4864 }
79072805 4865 else {
35cd451c 4866 I32 flags = OPf_SPECIAL;
a6c40364 4867 I32 priv = 0;
35cd451c 4868 /* is this op a FH constructor? */
853846ea 4869 if (is_handle_constructor(o,numargs)) {
1d8d4d2a 4870 flags = 0;
853846ea
NIS		 4871 /* Set a flag to tell rv2gv to vivify
4872 * need to "prove" flag does not mean something
4873 * else already - NI-S 1999/05/07
4874 */
a6c40364 4875 priv = OPpDEREF;
1d8d4d2a
NIS		 4876#if 0
4877 /* Helps with open($array[$n],...)
4878 but is too simplistic - need to do selectively
4879 */
4880 mod(kid,type);
4881#endif
853846ea 4882 }
79072805 4883 kid->op_sibling = 0;
35cd451c 4884 kid = newUNOP(OP_RV2GV, flags, scalar(kid));
a6c40364
GS		 4885 if (priv) {
4886 kid->op_private |= priv;
1d8d4d2a 4887 }
79072805
LW		 4888 }
4889 kid->op_sibling = sibl;
4890 *tokid = kid;
4891 }
4892 scalar(kid);
4893 break;
4894 case OA_SCALARREF:
a0d0e21e 4895 mod(scalar(kid), type);
79072805
LW		 4896 break;
4897 }
4898 oa >>= 4;
4899 tokid = &kid->op_sibling;
4900 kid = kid->op_sibling;
4901 }
11343788 4902 o->op_private |= numargs;
79072805 4903 if (kid)
22c35a8c 4904 return too_many_arguments(o,PL_op_desc[o->op_type]);
11343788 4905 listkids(o);
79072805 4906 }
22c35a8c 4907 else if (PL_opargs[type] & OA_DEFGV) {
11343788 4908 op_free(o);
54b9620d 4909 return newUNOP(type, 0, newDEFSVOP());
a0d0e21e
LW		 4910 }
4911
79072805
LW		 4912 if (oa) {
4913 while (oa & OA_OPTIONAL)
4914 oa >>= 4;
4915 if (oa && oa != OA_LIST)
22c35a8c 4916 return too_few_arguments(o,PL_op_desc[o->op_type]);
79072805 4917 }
11343788 4918 return o;
79072805
LW		 4919}
4920
4921OP *
cea2e8a9 4922Perl_ck_glob(pTHX_ OP *o)
79072805 4923{
fb73857a 4924 GV *gv;
4925
1f2bfc8a 4926 if ((o->op_flags & OPf_KIDS) && !cLISTOPo->op_first->op_sibling)
54b9620d 4927 append_elem(OP_GLOB, o, newDEFSVOP());
fb73857a 4928
4929 if (!((gv = gv_fetchpv("glob", FALSE, SVt_PVCV)) && GvIMPORTED_CV(gv)))
4930 gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
b1cb66bf 4931
4932 if (gv && GvIMPORTED_CV(gv)) {
5196be3e 4933 append_elem(OP_GLOB, o,
80252599 4934 newSVOP(OP_CONST, 0, newSViv(PL_glob_index++)));
1f2bfc8a 4935 o->op_type = OP_LIST;
22c35a8c 4936 o->op_ppaddr = PL_ppaddr[OP_LIST];
1f2bfc8a 4937 cLISTOPo->op_first->op_type = OP_PUSHMARK;
22c35a8c 4938 cLISTOPo->op_first->op_ppaddr = PL_ppaddr[OP_PUSHMARK];
1f2bfc8a 4939 o = newUNOP(OP_ENTERSUB, OPf_STACKED,
aeea060c 4940 append_elem(OP_LIST, o,
1f2bfc8a
MB		 4941 scalar(newUNOP(OP_RV2CV, 0,
4942 newGVOP(OP_GV, 0, gv)))));
d58bf5aa
MB		 4943 o = newUNOP(OP_NULL, 0, ck_subr(o));
4944 o->op_targ = OP_GLOB; /* hint at what it used to be */
4945 return o;
b1cb66bf 4946 }
4947 gv = newGVgen("main");
a0d0e21e 4948 gv_IOadd(gv);
11343788
MB		 4949 append_elem(OP_GLOB, o, newGVOP(OP_GV, 0, gv));
4950 scalarkids(o);
4951 return ck_fun(o);
79072805
LW		 4952}
4953
4954OP *
cea2e8a9 4955Perl_ck_grep(pTHX_ OP *o)
79072805
LW		 4956{
4957 LOGOP *gwop;
4958 OP *kid;
11343788 4959 OPCODE type = o->op_type == OP_GREPSTART ? OP_GREPWHILE : OP_MAPWHILE;
79072805 4960
22c35a8c 4961 o->op_ppaddr = PL_ppaddr[OP_GREPSTART];
b7dc083c 4962 NewOp(1101, gwop, 1, LOGOP);
aeea060c 4963
11343788 4964 if (o->op_flags & OPf_STACKED) {
a0d0e21e 4965 OP* k;
11343788
MB		 4966 o = ck_sort(o);
4967 kid = cLISTOPo->op_first->op_sibling;
4968 for (k = cLISTOPo->op_first->op_sibling->op_next; k; k = k->op_next) {
a0d0e21e
LW		 4969 kid = k;
4970 }
4971 kid->op_next = (OP*)gwop;
11343788 4972 o->op_flags &= ~OPf_STACKED;
93a17b20 4973 }
11343788 4974 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e
LW		 4975 if (type == OP_MAPWHILE)
4976 list(kid);
4977 else
4978 scalar(kid);
11343788 4979 o = ck_fun(o);
3280af22 4980 if (PL_error_count)
11343788 4981 return o;
aeea060c 4982 kid = cLISTOPo->op_first->op_sibling;
79072805 4983 if (kid->op_type != OP_NULL)
cea2e8a9 4984 Perl_croak(aTHX_ "panic: ck_grep");
79072805
LW		 4985 kid = kUNOP->op_first;
4986
a0d0e21e 4987 gwop->op_type = type;
22c35a8c 4988 gwop->op_ppaddr = PL_ppaddr[type];
11343788 4989 gwop->op_first = listkids(o);
79072805
LW		 4990 gwop->op_flags |= OPf_KIDS;
4991 gwop->op_private = 1;
4992 gwop->op_other = LINKLIST(kid);
a0d0e21e 4993 gwop->op_targ = pad_alloc(type, SVs_PADTMP);
79072805
LW		 4994 kid->op_next = (OP*)gwop;
4995
11343788 4996 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e 4997 if (!kid || !kid->op_sibling)
22c35a8c 4998 return too_few_arguments(o,PL_op_desc[o->op_type]);
a0d0e21e
LW		 4999 for (kid = kid->op_sibling; kid; kid = kid->op_sibling)
5000 mod(kid, OP_GREPSTART);
5001
79072805
LW		 5002 return (OP*)gwop;
5003}
5004
5005OP *
cea2e8a9 5006Perl_ck_index(pTHX_ OP *o)
79072805 5007{
11343788
MB		 5008 if (o->op_flags & OPf_KIDS) {
5009 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
0b71040e
LW		 5010 if (kid)
5011 kid = kid->op_sibling; /* get past "big" */
79072805 5012 if (kid && kid->op_type == OP_CONST)
2779dcf1 5013 fbm_compile(((SVOP*)kid)->op_sv, 0);
79072805 5014 }
11343788 5015 return ck_fun(o);
79072805
LW		 5016}
5017
5018OP *
cea2e8a9 5019Perl_ck_lengthconst(pTHX_ OP *o)
79072805
LW		 5020{
5021 /* XXX length optimization goes here */
11343788 5022 return ck_fun(o);
79072805
LW		 5023}
5024
5025OP *
cea2e8a9 5026Perl_ck_lfun(pTHX_ OP *o)
79072805 5027{
5dc0d613
MB		 5028 OPCODE type = o->op_type;
5029 return modkids(ck_fun(o), type);
79072805
LW		 5030}
5031
5032OP *
cea2e8a9 5033Perl_ck_defined(pTHX_ OP *o) /* 19990527 MJD */
69794302 5034{
20ce7b12 5035 dTHR;
d0334bed
GS		 5036 if ((o->op_flags & OPf_KIDS) && ckWARN(WARN_DEPRECATED)) {
5037 switch (cUNOPo->op_first->op_type) {
5038 case OP_RV2AV:
5039 case OP_PADAV:
5040 case OP_AASSIGN: /* Is this a good idea? */
5041 Perl_warner(aTHX_ WARN_DEPRECATED,
f10b0346 5042 "defined(@array) is deprecated");
d0334bed
GS		 5043 Perl_warner(aTHX_ WARN_DEPRECATED,
5044 "(Maybe you should just omit the defined()?)\n");
69794302 5045 break;
d0334bed
GS		 5046 case OP_RV2HV:
5047 case OP_PADHV:
5048 Perl_warner(aTHX_ WARN_DEPRECATED,
f10b0346 5049 "defined(%hash) is deprecated");
d0334bed
GS		 5050 Perl_warner(aTHX_ WARN_DEPRECATED,
5051 "(Maybe you should just omit the defined()?)\n");
5052 break;
5053 default:
5054 /* no warning */
5055 break;
5056 }
69794302
MJD		 5057 }
5058 return ck_rfun(o);
5059}
5060
5061OP *
cea2e8a9 5062Perl_ck_rfun(pTHX_ OP *o)
8990e307 5063{
5dc0d613
MB		 5064 OPCODE type = o->op_type;
5065 return refkids(ck_fun(o), type);
8990e307
LW		 5066}
5067
5068OP *
cea2e8a9 5069Perl_ck_listiob(pTHX_ OP *o)
79072805
LW		 5070{
5071 register OP *kid;
aeea060c 5072
11343788 5073 kid = cLISTOPo->op_first;
79072805 5074 if (!kid) {
11343788
MB		 5075 o = force_list(o);
5076 kid = cLISTOPo->op_first;
79072805
LW		 5077 }
5078 if (kid->op_type == OP_PUSHMARK)
5079 kid = kid->op_sibling;
11343788 5080 if (kid && o->op_flags & OPf_STACKED)
79072805
LW		 5081 kid = kid->op_sibling;
5082 else if (kid && !kid->op_sibling) { /* print HANDLE; */
5083 if (kid->op_type == OP_CONST && kid->op_private & OPpCONST_BARE) {
11343788 5084 o->op_flags |= OPf_STACKED; /* make it a filehandle */
748a9306 5085 kid = newUNOP(OP_RV2GV, OPf_REF, scalar(kid));
11343788
MB		 5086 cLISTOPo->op_first->op_sibling = kid;
5087 cLISTOPo->op_last = kid;
79072805
LW		 5088 kid = kid->op_sibling;
5089 }
5090 }
5091
5092 if (!kid)
54b9620d 5093 append_elem(o->op_type, o, newDEFSVOP());
79072805 5094
5dc0d613 5095 o = listkids(o);
bbce6d69 5096
5dc0d613 5097 o->op_private = 0;
36477c24 5098#ifdef USE_LOCALE
3280af22 5099 if (PL_hints & HINT_LOCALE)
5dc0d613 5100 o->op_private |= OPpLOCALE;
bbce6d69 5101#endif
5102
5dc0d613 5103 return o;
bbce6d69 5104}
5105
5106OP *
cea2e8a9 5107Perl_ck_fun_locale(pTHX_ OP *o)
bbce6d69 5108{
5dc0d613 5109 o = ck_fun(o);
bbce6d69 5110
5dc0d613 5111 o->op_private = 0;
36477c24 5112#ifdef USE_LOCALE
3280af22 5113 if (PL_hints & HINT_LOCALE)
5dc0d613 5114 o->op_private |= OPpLOCALE;
bbce6d69 5115#endif
5116
5dc0d613 5117 return o;
bbce6d69 5118}
5119
5120OP *
b162f9ea
IZ		 5121Perl_ck_sassign(pTHX_ OP *o)
5122{
5123 OP *kid = cLISTOPo->op_first;
5124 /* has a disposable target? */
5125 if ((PL_opargs[kid->op_type] & OA_TARGLEX)
5126 && !(kid->op_flags & OPf_STACKED))
5127 {
5128 OP *kkid = kid->op_sibling;
5129
5130 /* Can just relocate the target. */
5131 if (kkid && kkid->op_type == OP_PADSV) {
5132 /* Concat has problems if target is equal to right arg. */
5133 if (kid->op_type == OP_CONCAT
5134 && kLISTOP->op_first->op_sibling->op_type == OP_PADSV
5135 && kLISTOP->op_first->op_sibling->op_targ == kkid->op_targ)
5136 {
5137 return o;
5138 }
5139 kid->op_targ = kkid->op_targ;
5140 /* Now we do not need PADSV and SASSIGN. */
5141 kid->op_sibling = o->op_sibling; /* NULL */
5142 cLISTOPo->op_first = NULL;
5143 op_free(o);
5144 op_free(kkid);
5145 kid->op_private |= OPpTARGET_MY; /* Used for context settings */
5146 return kid;
5147 }
5148 }
5149 return o;
5150}
5151
5152OP *
cea2e8a9 5153Perl_ck_scmp(pTHX_ OP *o)
bbce6d69 5154{
5dc0d613 5155 o->op_private = 0;
36477c24 5156#ifdef USE_LOCALE
3280af22 5157 if (PL_hints & HINT_LOCALE)
5dc0d613 5158 o->op_private |= OPpLOCALE;
bbce6d69 5159#endif
36477c24 5160
5dc0d613 5161 return o;
79072805
LW		 5162}
5163
5164OP *
cea2e8a9 5165Perl_ck_match(pTHX_ OP *o)
79072805 5166{
5dc0d613 5167 o->op_private |= OPpRUNTIME;
11343788 5168 return o;
79072805
LW		 5169}
5170
5171OP *
cea2e8a9 5172Perl_ck_null(pTHX_ OP *o)
79072805 5173{
11343788 5174 return o;
79072805
LW		 5175}
5176
5177OP *
cea2e8a9 5178Perl_ck_repeat(pTHX_ OP *o)
79072805 5179{
11343788
MB		 5180 if (cBINOPo->op_first->op_flags & OPf_PARENS) {
5181 o->op_private |= OPpREPEAT_DOLIST;
5182 cBINOPo->op_first = force_list(cBINOPo->op_first);
79072805
LW		 5183 }
5184 else
11343788
MB		 5185 scalar(o);
5186 return o;
79072805
LW		 5187}
5188
5189OP *
cea2e8a9 5190Perl_ck_require(pTHX_ OP *o)
8990e307 5191{
11343788
MB		 5192 if (o->op_flags & OPf_KIDS) { /* Shall we supply missing .pm? */
5193 SVOP *kid = (SVOP*)cUNOPo->op_first;
8990e307
LW		 5194
5195 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
8990e307 5196 char *s;
a0d0e21e
LW		 5197 for (s = SvPVX(kid->op_sv); *s; s++) {
5198 if (*s == ':' && s[1] == ':') {
5199 *s = '/';
1aef975c 5200 Move(s+2, s+1, strlen(s+2)+1, char);
a0d0e21e
LW		 5201 --SvCUR(kid->op_sv);
5202 }
8990e307 5203 }
a0d0e21e 5204 sv_catpvn(kid->op_sv, ".pm", 3);
8990e307
LW		 5205 }
5206 }
11343788 5207 return ck_fun(o);
8990e307
LW		 5208}
5209
22c35a8c 5210#if 0
8990e307 5211OP *
cea2e8a9 5212Perl_ck_retarget(pTHX_ OP *o)
79072805 5213{
cea2e8a9 5214 Perl_croak(aTHX_ "NOT IMPL LINE %d",__LINE__);
79072805 5215 /* STUB */
11343788 5216 return o;
79072805 5217}
22c35a8c 5218#endif
79072805
LW		 5219
5220OP *
cea2e8a9 5221Perl_ck_select(pTHX_ OP *o)
79072805 5222{
c07a80fd 5223 OP* kid;
11343788
MB		 5224 if (o->op_flags & OPf_KIDS) {
5225 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
2304df62 5226 if (kid && kid->op_sibling) {
11343788 5227 o->op_type = OP_SSELECT;
22c35a8c 5228 o->op_ppaddr = PL_ppaddr[OP_SSELECT];
11343788
MB		 5229 o = ck_fun(o);
5230 return fold_constants(o);
79072805
LW		 5231 }
5232 }
11343788
MB		 5233 o = ck_fun(o);
5234 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
c07a80fd 5235 if (kid && kid->op_type == OP_RV2GV)
5236 kid->op_private &= ~HINT_STRICT_REFS;
11343788 5237 return o;
79072805
LW		 5238}
5239
5240OP *
cea2e8a9 5241Perl_ck_shift(pTHX_ OP *o)
79072805 5242{
11343788 5243 I32 type = o->op_type;
79072805 5244
11343788 5245 if (!(o->op_flags & OPf_KIDS)) {
6d4ff0d2
MB		 5246 OP *argop;
5247
11343788 5248 op_free(o);
6d4ff0d2 5249#ifdef USE_THREADS
533c011a 5250 if (!CvUNIQUE(PL_compcv)) {
6d4ff0d2 5251 argop = newOP(OP_PADAV, OPf_REF);
6b88bc9c 5252 argop->op_targ = 0; /* PL_curpad[0] is @_ */
6d4ff0d2
MB		 5253 }
5254 else {
5255 argop = newUNOP(OP_RV2AV, 0,
5256 scalar(newGVOP(OP_GV, 0,
5257 gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
5258 }
5259#else
5260 argop = newUNOP(OP_RV2AV, 0,
3280af22
NIS		 5261 scalar(newGVOP(OP_GV, 0, !CvUNIQUE(PL_compcv) ?
5262 PL_defgv : gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
6d4ff0d2
MB		 5263#endif /* USE_THREADS */
5264 return newUNOP(type, 0, scalar(argop));
79072805 5265 }
11343788 5266 return scalar(modkids(ck_fun(o), type));
79072805
LW		 5267}
5268
5269OP *
cea2e8a9 5270Perl_ck_sort(pTHX_ OP *o)
79072805 5271{
5dc0d613 5272 o->op_private = 0;
36477c24 5273#ifdef USE_LOCALE
3280af22 5274 if (PL_hints & HINT_LOCALE)
5dc0d613 5275 o->op_private |= OPpLOCALE;
bbce6d69 5276#endif
5277
9ea6e965 5278 if (o->op_type == OP_SORT && o->op_flags & OPf_STACKED)
51a19bc0 5279 simplify_sort(o);
9c007264 5280 if (o->op_flags & OPf_STACKED) { /* may have been cleared */
11343788 5281 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
463ee0b2 5282 OP *k;
82092f1d 5283 kid = kUNOP->op_first; /* get past null */
79072805 5284
463ee0b2 5285 if (kid->op_type == OP_SCOPE || kid->op_type == OP_LEAVE) {
79072805 5286 linklist(kid);
463ee0b2
LW		 5287 if (kid->op_type == OP_SCOPE) {
5288 k = kid->op_next;
5289 kid->op_next = 0;
79072805 5290 }
463ee0b2 5291 else if (kid->op_type == OP_LEAVE) {
11343788 5292 if (o->op_type == OP_SORT) {
748a9306
LW		 5293 null(kid); /* wipe out leave */
5294 kid->op_next = kid;
463ee0b2 5295
748a9306
LW		 5296 for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
5297 if (k->op_next == kid)
5298 k->op_next = 0;
5299 }
463ee0b2 5300 }
748a9306
LW		 5301 else
5302 kid->op_next = 0; /* just disconnect the leave */
a0d0e21e 5303 k = kLISTOP->op_first;
463ee0b2 5304 }
a0d0e21e
LW		 5305 peep(k);
5306
11343788 5307 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
11343788 5308 if (o->op_type == OP_SORT)
a0d0e21e
LW		 5309 kid->op_next = kid;
5310 else
5311 kid->op_next = k;
11343788 5312 o->op_flags |= OPf_SPECIAL;
79072805 5313 }
c6e96bcb
GS		 5314 else if (kid->op_type == OP_RV2SV || kid->op_type == OP_PADSV)
5315 null(cLISTOPo->op_first->op_sibling);
79072805 5316 }
bbce6d69 5317
11343788 5318 return o;
79072805 5319}
bda4119b
GS		 5320
5321STATIC void
cea2e8a9 5322S_simplify_sort(pTHX_ OP *o)
9c007264 5323{
51a19bc0 5324 dTHR;
9c007264
JH		 5325 register OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
5326 OP *k;
5327 int reversed;
5328 if (!(o->op_flags & OPf_STACKED))
5329 return;
9ea6e965
GS		 5330 GvMULTI_on(gv_fetchpv("a", TRUE, SVt_PV));
5331 GvMULTI_on(gv_fetchpv("b", TRUE, SVt_PV));
82092f1d 5332 kid = kUNOP->op_first; /* get past null */
9c007264
JH		 5333 if (kid->op_type != OP_SCOPE)
5334 return;
5335 kid = kLISTOP->op_last; /* get past scope */
5336 switch(kid->op_type) {
5337 case OP_NCMP:
5338 case OP_I_NCMP:
5339 case OP_SCMP:
5340 break;
5341 default:
5342 return;
5343 }
5344 k = kid; /* remember this node*/
5345 if (kBINOP->op_first->op_type != OP_RV2SV)
5346 return;
5347 kid = kBINOP->op_first; /* get past cmp */
5348 if (kUNOP->op_first->op_type != OP_GV)
5349 return;
5350 kid = kUNOP->op_first; /* get past rv2sv */
5351 if (GvSTASH(kGVOP->op_gv) != PL_curstash)
5352 return;
5353 if (strEQ(GvNAME(kGVOP->op_gv), "a"))
5354 reversed = 0;
5355 else if(strEQ(GvNAME(kGVOP->op_gv), "b"))
5356 reversed = 1;
5357 else
5358 return;
5359 kid = k; /* back to cmp */
5360 if (kBINOP->op_last->op_type != OP_RV2SV)
5361 return;
5362 kid = kBINOP->op_last; /* down to 2nd arg */
5363 if (kUNOP->op_first->op_type != OP_GV)
5364 return;
5365 kid = kUNOP->op_first; /* get past rv2sv */
5366 if (GvSTASH(kGVOP->op_gv) != PL_curstash
5367 || ( reversed
5368 ? strNE(GvNAME(kGVOP->op_gv), "a")
5369 : strNE(GvNAME(kGVOP->op_gv), "b")))
5370 return;
5371 o->op_flags &= ~(OPf_STACKED | OPf_SPECIAL);
5372 if (reversed)
5373 o->op_private |= OPpSORT_REVERSE;
5374 if (k->op_type == OP_NCMP)
5375 o->op_private |= OPpSORT_NUMERIC;
5376 if (k->op_type == OP_I_NCMP)
5377 o->op_private |= OPpSORT_NUMERIC | OPpSORT_INTEGER;
5378 op_free(cLISTOPo->op_first->op_sibling); /* delete comparison block */
5379 cLISTOPo->op_first->op_sibling = cLISTOPo->op_last;
5380 cLISTOPo->op_children = 1;
5381}
79072805
LW		 5382
5383OP *
cea2e8a9 5384Perl_ck_split(pTHX_ OP *o)
79072805
LW		 5385{
5386 register OP *kid;
aeea060c 5387
11343788
MB		 5388 if (o->op_flags & OPf_STACKED)
5389 return no_fh_allowed(o);
79072805 5390
11343788 5391 kid = cLISTOPo->op_first;
8990e307 5392 if (kid->op_type != OP_NULL)
cea2e8a9 5393 Perl_croak(aTHX_ "panic: ck_split");
8990e307 5394 kid = kid->op_sibling;
11343788
MB		 5395 op_free(cLISTOPo->op_first);
5396 cLISTOPo->op_first = kid;
85e6fe83 5397 if (!kid) {
79cb57f6 5398 cLISTOPo->op_first = kid = newSVOP(OP_CONST, 0, newSVpvn(" ", 1));
11343788 5399 cLISTOPo->op_last = kid; /* There was only one element previously */
85e6fe83 5400 }
79072805
LW		 5401
5402 if (kid->op_type != OP_MATCH) {
5403 OP *sibl = kid->op_sibling;
463ee0b2 5404 kid->op_sibling = 0;
79072805 5405 kid = pmruntime( newPMOP(OP_MATCH, OPf_SPECIAL), kid, Nullop);
11343788
MB		 5406 if (cLISTOPo->op_first == cLISTOPo->op_last)
5407 cLISTOPo->op_last = kid;
5408 cLISTOPo->op_first = kid;
79072805
LW		 5409 kid->op_sibling = sibl;
5410 }
5411
5412 kid->op_type = OP_PUSHRE;
22c35a8c 5413 kid->op_ppaddr = PL_ppaddr[OP_PUSHRE];
79072805
LW		 5414 scalar(kid);
5415
5416 if (!kid->op_sibling)
54b9620d 5417 append_elem(OP_SPLIT, o, newDEFSVOP());
79072805
LW		 5418
5419 kid = kid->op_sibling;
5420 scalar(kid);
5421
5422 if (!kid->op_sibling)
11343788 5423 append_elem(OP_SPLIT, o, newSVOP(OP_CONST, 0, newSViv(0)));
79072805
LW		 5424
5425 kid = kid->op_sibling;
5426 scalar(kid);
5427
5428 if (kid->op_sibling)
22c35a8c 5429 return too_many_arguments(o,PL_op_desc[o->op_type]);
79072805 5430
11343788 5431 return o;
79072805
LW		 5432}
5433
5434OP *
cea2e8a9 5435Perl_ck_subr(pTHX_ OP *o)
79072805 5436{
11343788
MB		 5437 dTHR;
5438 OP *prev = ((cUNOPo->op_first->op_sibling)
5439 ? cUNOPo : ((UNOP*)cUNOPo->op_first))->op_first;
5440 OP *o2 = prev->op_sibling;
4633a7c4
LW		 5441 OP *cvop;
5442 char *proto = 0;
5443 CV *cv = 0;
46fc3d4c 5444 GV *namegv = 0;
4633a7c4
LW		 5445 int optional = 0;
5446 I32 arg = 0;
2d8e6c8d 5447 STRLEN n_a;
4633a7c4 5448
11343788 5449 for (cvop = o2; cvop->op_sibling; cvop = cvop->op_sibling) ;
4633a7c4
LW		 5450 if (cvop->op_type == OP_RV2CV) {
5451 SVOP* tmpop;
11343788 5452 o->op_private |= (cvop->op_private & OPpENTERSUB_AMPER);
4633a7c4
LW		 5453 null(cvop); /* disable rv2cv */
5454 tmpop = (SVOP*)((UNOP*)cvop)->op_first;
5455 if (tmpop->op_type == OP_GV) {
8ebc5c01 5456 cv = GvCVu(tmpop->op_sv);
5dc0d613 5457 if (cv && SvPOK(cv) && !(o->op_private & OPpENTERSUB_AMPER)) {
46fc3d4c 5458 namegv = CvANON(cv) ? (GV*)tmpop->op_sv : CvGV(cv);
2d8e6c8d 5459 proto = SvPV((SV*)cv, n_a);
46fc3d4c 5460 }
4633a7c4
LW		 5461 }
5462 }
7a52d87a
GS		 5463 else if (cvop->op_type == OP_METHOD) {
5464 if (o2->op_type == OP_CONST)
5465 o2->op_private &= ~OPpCONST_STRICT;
58a40671
GS		 5466 else if (o2->op_type == OP_LIST) {
5467 OP *o = ((UNOP*)o2)->op_first->op_sibling;
5468 if (o && o->op_type == OP_CONST)
5469 o->op_private &= ~OPpCONST_STRICT;
5470 }
7a52d87a 5471 }
3280af22
NIS		 5472 o->op_private |= (PL_hints & HINT_STRICT_REFS);
5473 if (PERLDB_SUB && PL_curstash != PL_debstash)
11343788
MB		 5474 o->op_private |= OPpENTERSUB_DB;
5475 while (o2 != cvop) {
4633a7c4
LW		 5476 if (proto) {
5477 switch (*proto) {
5478 case '\0':
5dc0d613 5479 return too_many_arguments(o, gv_ename(namegv));
4633a7c4
LW		 5480 case ';':
5481 optional = 1;
5482 proto++;
5483 continue;
5484 case '$':
5485 proto++;
5486 arg++;
11343788 5487 scalar(o2);
4633a7c4
LW		 5488 break;
5489 case '%':
5490 case '@':
11343788 5491 list(o2);
4633a7c4
LW		 5492 arg++;
5493 break;
5494 case '&':
5495 proto++;
5496 arg++;
11343788 5497 if (o2->op_type != OP_REFGEN && o2->op_type != OP_UNDEF)
5dc0d613 5498 bad_type(arg, "block", gv_ename(namegv), o2);
4633a7c4
LW		 5499 break;
5500 case '*':
2ba6ecf4 5501 /* '*' allows any scalar type, including bareword */
4633a7c4
LW		 5502 proto++;
5503 arg++;
11343788 5504 if (o2->op_type == OP_RV2GV)
2ba6ecf4 5505 goto wrapref; /* autoconvert GLOB -> GLOBref */
7a52d87a
GS		 5506 else if (o2->op_type == OP_CONST)
5507 o2->op_private &= ~OPpCONST_STRICT;
9675f7ac
GS		 5508 else if (o2->op_type == OP_ENTERSUB) {
5509 /* accidental subroutine, revert to bareword */
5510 OP *gvop = ((UNOP*)o2)->op_first;
5511 if (gvop && gvop->op_type == OP_NULL) {
5512 gvop = ((UNOP*)gvop)->op_first;
5513 if (gvop) {
5514 for (; gvop->op_sibling; gvop = gvop->op_sibling)
5515 ;
5516 if (gvop &&
5517 (gvop->op_private & OPpENTERSUB_NOPAREN) &&
5518 (gvop = ((UNOP*)gvop)->op_first) &&
5519 gvop->op_type == OP_GV)
5520 {
5521 GV *gv = (GV*)((SVOP*)gvop)->op_sv;
5522 OP *sibling = o2->op_sibling;
2692f720 5523 SV *n = newSVpvn("",0);
9675f7ac 5524 op_free(o2);
2692f720
GS		 5525 gv_fullname3(n, gv, "");
5526 if (SvCUR(n)>6 && strnEQ(SvPVX(n),"main::",6))
5527 sv_chop(n, SvPVX(n)+6);
5528 o2 = newSVOP(OP_CONST, 0, n);
9675f7ac
GS		 5529 prev->op_sibling = o2;
5530 o2->op_sibling = sibling;
5531 }
5532 }
5533 }
5534 }
2ba6ecf4
GS		 5535 scalar(o2);
5536 break;
4633a7c4
LW		 5537 case '\\':
5538 proto++;
5539 arg++;
5540 switch (*proto++) {
5541 case '*':
11343788 5542 if (o2->op_type != OP_RV2GV)
5dc0d613 5543 bad_type(arg, "symbol", gv_ename(namegv), o2);
4633a7c4
LW		 5544 goto wrapref;
5545 case '&':
11343788 5546 if (o2->op_type != OP_RV2CV)
5dc0d613 5547 bad_type(arg, "sub", gv_ename(namegv), o2);
4633a7c4
LW		 5548 goto wrapref;
5549 case '$':
386acf99
GS		 5550 if (o2->op_type != OP_RV2SV
5551 && o2->op_type != OP_PADSV
5552 && o2->op_type != OP_THREADSV)
5553 {
5dc0d613 5554 bad_type(arg, "scalar", gv_ename(namegv), o2);
386acf99 5555 }
4633a7c4
LW		 5556 goto wrapref;
5557 case '@':
11343788 5558 if (o2->op_type != OP_RV2AV && o2->op_type != OP_PADAV)
5dc0d613 5559 bad_type(arg, "array", gv_ename(namegv), o2);
4633a7c4
LW		 5560 goto wrapref;
5561 case '%':
11343788 5562 if (o2->op_type != OP_RV2HV && o2->op_type != OP_PADHV)
5dc0d613 5563 bad_type(arg, "hash", gv_ename(namegv), o2);
4633a7c4
LW		 5564 wrapref:
5565 {
11343788 5566 OP* kid = o2;
6fa846a0 5567 OP* sib = kid->op_sibling;
4633a7c4 5568 kid->op_sibling = 0;
6fa846a0
GS		 5569 o2 = newUNOP(OP_REFGEN, 0, kid);
5570 o2->op_sibling = sib;
e858de61 5571 prev->op_sibling = o2;
4633a7c4
LW		 5572 }
5573 break;
5574 default: goto oops;
5575 }
5576 break;
b1cb66bf 5577 case ' ':
5578 proto++;
5579 continue;
4633a7c4
LW		 5580 default:
5581 oops:
cea2e8a9 5582 Perl_croak(aTHX_ "Malformed prototype for %s: %s",
2d8e6c8d 5583 gv_ename(namegv), SvPV((SV*)cv, n_a));
4633a7c4
LW		 5584 }
5585 }
5586 else
11343788
MB		 5587 list(o2);
5588 mod(o2, OP_ENTERSUB);
5589 prev = o2;
5590 o2 = o2->op_sibling;
4633a7c4 5591 }
fb73857a 5592 if (proto && !optional &&
5593 (*proto && *proto != '@' && *proto != '%' && *proto != ';'))
5dc0d613 5594 return too_few_arguments(o, gv_ename(namegv));
11343788 5595 return o;
79072805
LW		 5596}
5597
5598OP *
cea2e8a9 5599Perl_ck_svconst(pTHX_ OP *o)
8990e307 5600{
11343788
MB		 5601 SvREADONLY_on(cSVOPo->op_sv);
5602 return o;
8990e307
LW		 5603}
5604
5605OP *
cea2e8a9 5606Perl_ck_trunc(pTHX_ OP *o)
79072805 5607{
11343788
MB		 5608 if (o->op_flags & OPf_KIDS) {
5609 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 5610
a0d0e21e
LW		 5611 if (kid->op_type == OP_NULL)
5612 kid = (SVOP*)kid->op_sibling;
bb53490d
GS		 5613 if (kid && kid->op_type == OP_CONST &&
5614 (kid->op_private & OPpCONST_BARE))
5615 {
11343788 5616 o->op_flags |= OPf_SPECIAL;
bb53490d
GS		 5617 kid->op_private &= ~OPpCONST_STRICT;
5618 }
79072805 5619 }
11343788 5620 return ck_fun(o);
79072805
LW		 5621}
5622
463ee0b2
LW		 5623/* A peephole optimizer. We visit the ops in the order they're to execute. */
5624
79072805 5625void
864dbfa3 5626Perl_peep(pTHX_ register OP *o)
79072805 5627{
11343788 5628 dTHR;
79072805 5629 register OP* oldop = 0;
2d8e6c8d
GS		 5630 STRLEN n_a;
5631
a0d0e21e 5632 if (!o || o->op_seq)
79072805 5633 return;
a0d0e21e 5634 ENTER;
462e5cf6 5635 SAVEOP();
3280af22 5636 SAVESPTR(PL_curcop);
a0d0e21e
LW		 5637 for (; o; o = o->op_next) {
5638 if (o->op_seq)
5639 break;
3280af22
NIS		 5640 if (!PL_op_seqmax)
5641 PL_op_seqmax++;
533c011a 5642 PL_op = o;
a0d0e21e
LW		 5643 switch (o->op_type) {
5644 case OP_NEXTSTATE:
5645 case OP_DBSTATE:
3280af22
NIS		 5646 PL_curcop = ((COP*)o); /* for warnings */
5647 o->op_seq = PL_op_seqmax++;
a0d0e21e
LW		 5648 break;
5649
a0d0e21e 5650 case OP_CONST:
7a52d87a
GS		 5651 if (cSVOPo->op_private & OPpCONST_STRICT)
5652 no_bareword_allowed(o);
5653 /* FALL THROUGH */
5654 case OP_CONCAT:
a0d0e21e
LW		 5655 case OP_JOIN:
5656 case OP_UC:
5657 case OP_UCFIRST:
5658 case OP_LC:
5659 case OP_LCFIRST:
5660 case OP_QUOTEMETA:
b162f9ea
IZ		 5661 if (o->op_next && o->op_next->op_type == OP_STRINGIFY) {
5662 if (o->op_next->op_private & OPpTARGET_MY) {
5663 if ((o->op_type == OP_CONST) /* no target */
5664 || (o->op_flags & OPf_STACKED) /* chained concats */
5665 || (o->op_type == OP_CONCAT
5666 /* Concat has problems if target is equal to right arg. */
5667 && (((LISTOP*)o)->op_first->op_sibling->op_type
5668 == OP_PADSV)
5669 && (((LISTOP*)o)->op_first->op_sibling->op_targ
5670 == o->op_next->op_targ))) {
5671 goto ignore_optimization;
5672 } else {
5673 o->op_targ = o->op_next->op_targ;
5674 }
5675 }
a0d0e21e 5676 null(o->op_next);
b162f9ea
IZ		 5677 }
5678 ignore_optimization:
3280af22 5679 o->op_seq = PL_op_seqmax++;
a0d0e21e 5680 break;
8990e307 5681 case OP_STUB:
54310121 5682 if ((o->op_flags & OPf_WANT) != OPf_WANT_LIST) {
3280af22 5683 o->op_seq = PL_op_seqmax++;
54310121 5684 break; /* Scalar stub must produce undef. List stub is noop */
8990e307 5685 }
748a9306 5686 goto nothin;
79072805 5687 case OP_NULL:
748a9306 5688 if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
3280af22 5689 PL_curcop = ((COP*)o);
748a9306 5690 goto nothin;
79072805 5691 case OP_SCALAR:
93a17b20 5692 case OP_LINESEQ:
463ee0b2 5693 case OP_SCOPE:
748a9306 5694 nothin:
a0d0e21e
LW		 5695 if (oldop && o->op_next) {
5696 oldop->op_next = o->op_next;
79072805
LW		 5697 continue;
5698 }
3280af22 5699 o->op_seq = PL_op_seqmax++;
79072805
LW		 5700 break;
5701
5702 case OP_GV:
a0d0e21e 5703 if (o->op_next->op_type == OP_RV2SV) {
5f05dabc 5704 if (!(o->op_next->op_private & OPpDEREF)) {
a0d0e21e
LW		 5705 null(o->op_next);
5706 o->op_private |= o->op_next->op_private & OPpLVAL_INTRO;
5707 o->op_next = o->op_next->op_next;
5708 o->op_type = OP_GVSV;
22c35a8c 5709 o->op_ppaddr = PL_ppaddr[OP_GVSV];
8990e307
LW		 5710 }
5711 }
a0d0e21e
LW		 5712 else if (o->op_next->op_type == OP_RV2AV) {
5713 OP* pop = o->op_next->op_next;
5714 IV i;
8990e307 5715 if (pop->op_type == OP_CONST &&
533c011a 5716 (PL_op = pop->op_next) &&
8990e307 5717 pop->op_next->op_type == OP_AELEM &&
a0d0e21e 5718 !(pop->op_next->op_private &
68dc0745 5719 (OPpLVAL_INTRO|OPpLVAL_DEFER|OPpDEREF)) &&
3280af22 5720 (i = SvIV(((SVOP*)pop)->op_sv) - PL_compiling.cop_arybase)
a0d0e21e 5721 <= 255 &&
8990e307
LW		 5722 i >= 0)
5723 {
748a9306 5724 SvREFCNT_dec(((SVOP*)pop)->op_sv);
a0d0e21e 5725 null(o->op_next);
8990e307
LW		 5726 null(pop->op_next);
5727 null(pop);
a0d0e21e
LW		 5728 o->op_flags |= pop->op_next->op_flags & OPf_MOD;
5729 o->op_next = pop->op_next->op_next;
5730 o->op_type = OP_AELEMFAST;
22c35a8c 5731 o->op_ppaddr = PL_ppaddr[OP_AELEMFAST];
a0d0e21e 5732 o->op_private = (U8)i;
a6006777 5733 GvAVn(((GVOP*)o)->op_gv);
8990e307 5734 }
79072805 5735 }
3280af22 5736 o->op_seq = PL_op_seqmax++;
79072805
LW		 5737 break;
5738
a0d0e21e 5739 case OP_MAPWHILE:
79072805
LW		 5740 case OP_GREPWHILE:
5741 case OP_AND:
5742 case OP_OR:
1a67a97c
SM		 5743 case OP_COND_EXPR:
5744 case OP_RANGE:
3280af22 5745 o->op_seq = PL_op_seqmax++;
fd4d1407
IZ		 5746 while (cLOGOP->op_other->op_type == OP_NULL)
5747 cLOGOP->op_other = cLOGOP->op_other->op_next;
79072805
LW		 5748 peep(cLOGOP->op_other);
5749 break;
5750
79072805 5751 case OP_ENTERLOOP:
3280af22 5752 o->op_seq = PL_op_seqmax++;
79072805
LW		 5753 peep(cLOOP->op_redoop);
5754 peep(cLOOP->op_nextop);
5755 peep(cLOOP->op_lastop);
5756 break;
5757
8782bef2 5758 case OP_QR:
79072805
LW		 5759 case OP_MATCH:
5760 case OP_SUBST:
3280af22 5761 o->op_seq = PL_op_seqmax++;
a0d0e21e 5762 peep(cPMOP->op_pmreplstart);
79072805
LW		 5763 break;
5764
a0d0e21e 5765 case OP_EXEC:
3280af22 5766 o->op_seq = PL_op_seqmax++;
599cee73
PM		 5767 if (ckWARN(WARN_SYNTAX) && o->op_next
5768 && o->op_next->op_type == OP_NEXTSTATE) {
a0d0e21e 5769 if (o->op_next->op_sibling &&
20408e3c
GS		 5770 o->op_next->op_sibling->op_type != OP_EXIT &&
5771 o->op_next->op_sibling->op_type != OP_WARN &&
a0d0e21e 5772 o->op_next->op_sibling->op_type != OP_DIE) {
3280af22 5773 line_t oldline = PL_curcop->cop_line;
a0d0e21e 5774
3280af22 5775 PL_curcop->cop_line = ((COP*)o->op_next)->cop_line;
cea2e8a9
GS		 5776 Perl_warner(aTHX_ WARN_SYNTAX, "Statement unlikely to be reached");
5777 Perl_warner(aTHX_ WARN_SYNTAX, "(Maybe you meant system() when you said exec()?)\n");
3280af22 5778 PL_curcop->cop_line = oldline;
a0d0e21e
LW		 5779 }
5780 }
5781 break;
aeea060c 5782
c750a3ec
MB		 5783 case OP_HELEM: {
5784 UNOP *rop;
5785 SV *lexname;
5786 GV **fields;
5787 SV **svp, **indsvp;
5788 I32 ind;
5789 char *key;
5790 STRLEN keylen;
aeea060c 5791
377b21bb 5792 if ((o->op_private & (OPpLVAL_INTRO))
c750a3ec
MB		 5793 || ((BINOP*)o)->op_last->op_type != OP_CONST)
5794 break;
5795 rop = (UNOP*)((BINOP*)o)->op_first;
5796 if (rop->op_type != OP_RV2HV || rop->op_first->op_type != OP_PADSV)
5797 break;
3280af22 5798 lexname = *av_fetch(PL_comppad_name, rop->op_first->op_targ, TRUE);
c750a3ec
MB		 5799 if (!SvOBJECT(lexname))
5800 break;
5196be3e 5801 fields = (GV**)hv_fetch(SvSTASH(lexname), "FIELDS", 6, FALSE);
c750a3ec
MB		 5802 if (!fields || !GvHV(*fields))
5803 break;
5804 svp = &((SVOP*)((BINOP*)o)->op_last)->op_sv;
5805 key = SvPV(*svp, keylen);
5806 indsvp = hv_fetch(GvHV(*fields), key, keylen, FALSE);
5807 if (!indsvp) {
cea2e8a9 5808 Perl_croak(aTHX_ "No such field \"%s\" in variable %s of type %s",
2d8e6c8d 5809 key, SvPV(lexname, n_a), HvNAME(SvSTASH(lexname)));
c750a3ec
MB		 5810 }
5811 ind = SvIV(*indsvp);
5812 if (ind < 1)
cea2e8a9 5813 Perl_croak(aTHX_ "Bad index while coercing array into hash");
c750a3ec 5814 rop->op_type = OP_RV2AV;
22c35a8c 5815 rop->op_ppaddr = PL_ppaddr[OP_RV2AV];
c750a3ec 5816 o->op_type = OP_AELEM;
22c35a8c 5817 o->op_ppaddr = PL_ppaddr[OP_AELEM];
c750a3ec
MB		 5818 SvREFCNT_dec(*svp);
5819 *svp = newSViv(ind);
5820 break;
5821 }
5822
79072805 5823 default:
3280af22 5824 o->op_seq = PL_op_seqmax++;
79072805
LW		 5825 break;
5826 }
a0d0e21e 5827 oldop = o;
79072805 5828 }
a0d0e21e 5829 LEAVE;
79072805 5830}
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