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fix little utf8 nits in testsuite; add patch from Ilya that cures
[perl5.git] / op.c
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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)
0b94c7bb 680 || (PL_check[o->op_type] != MEMBER_TO_FPTR(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 687 break;
7399586d
HS		 688 case OP_SETSTATE:
689 o->op_targ = 0; /* Was holding old type. */
690 /* FALL THROUGH */
8990e307
LW		 691 case OP_NEXTSTATE:
692 case OP_DBSTATE:
3eb57f73 693 cop_free((COP*)o);
79072805
LW		 694 break;
695 case OP_CONST:
11343788 696 SvREFCNT_dec(cSVOPo->op_sv);
79072805 697 break;
748a9306
LW		 698 case OP_GOTO:
699 case OP_NEXT:
700 case OP_LAST:
701 case OP_REDO:
11343788 702 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 703 break;
704 /* FALL THROUGH */
a0d0e21e 705 case OP_TRANS:
a0ed51b3
LW		 706 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF))
707 SvREFCNT_dec(cSVOPo->op_sv);
708 else
709 Safefree(cPVOPo->op_pv);
a0d0e21e
LW		 710 break;
711 case OP_SUBST:
11343788 712 op_free(cPMOPo->op_pmreplroot);
a0d0e21e 713 /* FALL THROUGH */
748a9306 714 case OP_PUSHRE:
a0d0e21e 715 case OP_MATCH:
8782bef2 716 case OP_QR:
c277df42 717 ReREFCNT_dec(cPMOPo->op_pmregexp);
a0d0e21e 718 break;
79072805
LW		 719 }
720
11343788
MB		 721 if (o->op_targ > 0)
722 pad_free(o->op_targ);
8990e307 723
b7dc083c
NIS		 724#ifdef PL_OP_SLAB_ALLOC
725 if ((char *) o == PL_OpPtr)
726 {
727 }
728#else
11343788 729 Safefree(o);
b7dc083c 730#endif
79072805
LW		 731}
732
76e3520e 733STATIC void
3eb57f73
HS		 734S_cop_free(pTHX_ COP* cop)
735{
736 Safefree(cop->cop_label);
737 SvREFCNT_dec(cop->cop_filegv);
0453d815 738 if (! specialWARN(cop->cop_warnings))
3eb57f73
HS		 739 SvREFCNT_dec(cop->cop_warnings);
740}
741
742STATIC void
cea2e8a9 743S_null(pTHX_ OP *o)
8990e307 744{
7399586d
HS		 745 if (o->op_type == OP_NEXTSTATE || o->op_type == OP_DBSTATE)
746 cop_free((COP*)o);
54b9620d 747 if (o->op_type != OP_NULL && o->op_type != OP_THREADSV && o->op_targ > 0)
11343788
MB		 748 pad_free(o->op_targ);
749 o->op_targ = o->op_type;
750 o->op_type = OP_NULL;
22c35a8c 751 o->op_ppaddr = PL_ppaddr[OP_NULL];
8990e307
LW		 752}
753
79072805
LW		 754/* Contextualizers */
755
463ee0b2 756#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 757
758OP *
864dbfa3 759Perl_linklist(pTHX_ OP *o)
79072805
LW		 760{
761 register OP *kid;
762
11343788
MB		 763 if (o->op_next)
764 return o->op_next;
79072805
LW		 765
766 /* establish postfix order */
11343788
MB		 767 if (cUNOPo->op_first) {
768 o->op_next = LINKLIST(cUNOPo->op_first);
769 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 770 if (kid->op_sibling)
771 kid->op_next = LINKLIST(kid->op_sibling);
772 else
11343788 773 kid->op_next = o;
79072805
LW		 774 }
775 }
776 else
11343788 777 o->op_next = o;
79072805 778
11343788 779 return o->op_next;
79072805
LW		 780}
781
782OP *
864dbfa3 783Perl_scalarkids(pTHX_ OP *o)
79072805
LW		 784{
785 OP *kid;
11343788
MB		 786 if (o && o->op_flags & OPf_KIDS) {
787 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 788 scalar(kid);
789 }
11343788 790 return o;
79072805
LW		 791}
792
76e3520e 793STATIC OP *
cea2e8a9 794S_scalarboolean(pTHX_ OP *o)
8990e307 795{
d008e5eb 796 if (o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
0f15f207 797 dTHR;
d008e5eb
GS		 798 if (ckWARN(WARN_SYNTAX)) {
799 line_t oldline = PL_curcop->cop_line;
a0d0e21e 800
d008e5eb
GS		 801 if (PL_copline != NOLINE)
802 PL_curcop->cop_line = PL_copline;
cea2e8a9 803 Perl_warner(aTHX_ WARN_SYNTAX, "Found = in conditional, should be ==");
d008e5eb
GS		 804 PL_curcop->cop_line = oldline;
805 }
a0d0e21e 806 }
11343788 807 return scalar(o);
8990e307
LW		 808}
809
810OP *
864dbfa3 811Perl_scalar(pTHX_ OP *o)
79072805
LW		 812{
813 OP *kid;
814
a0d0e21e 815 /* assumes no premature commitment */
3280af22 816 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 817 || o->op_type == OP_RETURN)
11343788 818 return o;
79072805 819
b162f9ea
IZ		 820 if ((o->op_private & OPpTARGET_MY)
821 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
822 return scalar(o); /* As if inside SASSIGN */
823
5dc0d613 824 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 825
11343788 826 switch (o->op_type) {
79072805 827 case OP_REPEAT:
11343788
MB		 828 if (o->op_private & OPpREPEAT_DOLIST)
829 null(((LISTOP*)cBINOPo->op_first)->op_first);
830 scalar(cBINOPo->op_first);
8990e307 831 break;
79072805
LW		 832 case OP_OR:
833 case OP_AND:
834 case OP_COND_EXPR:
11343788 835 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 836 scalar(kid);
79072805 837 break;
a0d0e21e 838 case OP_SPLIT:
11343788 839 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 840 if (!kPMOP->op_pmreplroot)
841 deprecate("implicit split to @_");
842 }
843 /* FALL THROUGH */
79072805 844 case OP_MATCH:
8782bef2 845 case OP_QR:
79072805
LW		 846 case OP_SUBST:
847 case OP_NULL:
8990e307 848 default:
11343788
MB		 849 if (o->op_flags & OPf_KIDS) {
850 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 851 scalar(kid);
852 }
79072805
LW		 853 break;
854 case OP_LEAVE:
855 case OP_LEAVETRY:
5dc0d613 856 kid = cLISTOPo->op_first;
54310121 857 scalar(kid);
858 while (kid = kid->op_sibling) {
859 if (kid->op_sibling)
860 scalarvoid(kid);
861 else
862 scalar(kid);
863 }
3280af22 864 WITH_THR(PL_curcop = &PL_compiling);
54310121 865 break;
748a9306 866 case OP_SCOPE:
79072805 867 case OP_LINESEQ:
8990e307 868 case OP_LIST:
11343788 869 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 870 if (kid->op_sibling)
871 scalarvoid(kid);
872 else
873 scalar(kid);
874 }
3280af22 875 WITH_THR(PL_curcop = &PL_compiling);
79072805
LW		 876 break;
877 }
11343788 878 return o;
79072805
LW		 879}
880
881OP *
864dbfa3 882Perl_scalarvoid(pTHX_ OP *o)
79072805
LW		 883{
884 OP *kid;
8990e307
LW		 885 char* useless = 0;
886 SV* sv;
2ebea0a1
GS		 887 U8 want;
888
889 if (o->op_type == OP_NEXTSTATE || o->op_type == OP_DBSTATE ||
890 (o->op_type == OP_NULL &&
891 (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)))
892 {
893 dTHR;
894 PL_curcop = (COP*)o; /* for warning below */
895 }
79072805 896
54310121 897 /* assumes no premature commitment */
2ebea0a1
GS		 898 want = o->op_flags & OPf_WANT;
899 if ((want && want != OPf_WANT_SCALAR) || PL_error_count
5dc0d613 900 || o->op_type == OP_RETURN)
11343788 901 return o;
79072805 902
b162f9ea
IZ		 903 if ((o->op_private & OPpTARGET_MY)
904 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
905 return scalar(o); /* As if inside SASSIGN */
906
5dc0d613 907 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 908
11343788 909 switch (o->op_type) {
79072805 910 default:
22c35a8c 911 if (!(PL_opargs[o->op_type] & OA_FOLDCONST))
8990e307 912 break;
36477c24 913 /* FALL THROUGH */
914 case OP_REPEAT:
11343788 915 if (o->op_flags & OPf_STACKED)
8990e307 916 break;
5d82c453
GA		 917 goto func_ops;
918 case OP_SUBSTR:
919 if (o->op_private == 4)
920 break;
8990e307
LW		 921 /* FALL THROUGH */
922 case OP_GVSV:
923 case OP_WANTARRAY:
924 case OP_GV:
925 case OP_PADSV:
926 case OP_PADAV:
927 case OP_PADHV:
928 case OP_PADANY:
929 case OP_AV2ARYLEN:
8990e307 930 case OP_REF:
a0d0e21e
LW		 931 case OP_REFGEN:
932 case OP_SREFGEN:
8990e307
LW		 933 case OP_DEFINED:
934 case OP_HEX:
935 case OP_OCT:
936 case OP_LENGTH:
8990e307
LW		 937 case OP_VEC:
938 case OP_INDEX:
939 case OP_RINDEX:
940 case OP_SPRINTF:
941 case OP_AELEM:
942 case OP_AELEMFAST:
943 case OP_ASLICE:
8990e307
LW		 944 case OP_HELEM:
945 case OP_HSLICE:
946 case OP_UNPACK:
947 case OP_PACK:
8990e307
LW		 948 case OP_JOIN:
949 case OP_LSLICE:
950 case OP_ANONLIST:
951 case OP_ANONHASH:
952 case OP_SORT:
953 case OP_REVERSE:
954 case OP_RANGE:
955 case OP_FLIP:
956 case OP_FLOP:
957 case OP_CALLER:
958 case OP_FILENO:
959 case OP_EOF:
960 case OP_TELL:
961 case OP_GETSOCKNAME:
962 case OP_GETPEERNAME:
963 case OP_READLINK:
964 case OP_TELLDIR:
965 case OP_GETPPID:
966 case OP_GETPGRP:
967 case OP_GETPRIORITY:
968 case OP_TIME:
969 case OP_TMS:
970 case OP_LOCALTIME:
971 case OP_GMTIME:
972 case OP_GHBYNAME:
973 case OP_GHBYADDR:
974 case OP_GHOSTENT:
975 case OP_GNBYNAME:
976 case OP_GNBYADDR:
977 case OP_GNETENT:
978 case OP_GPBYNAME:
979 case OP_GPBYNUMBER:
980 case OP_GPROTOENT:
981 case OP_GSBYNAME:
982 case OP_GSBYPORT:
983 case OP_GSERVENT:
984 case OP_GPWNAM:
985 case OP_GPWUID:
986 case OP_GGRNAM:
987 case OP_GGRGID:
988 case OP_GETLOGIN:
5d82c453 989 func_ops:
11343788 990 if (!(o->op_private & OPpLVAL_INTRO))
22c35a8c 991 useless = PL_op_desc[o->op_type];
8990e307
LW		 992 break;
993
994 case OP_RV2GV:
995 case OP_RV2SV:
996 case OP_RV2AV:
997 case OP_RV2HV:
11343788
MB		 998 if (!(o->op_private & OPpLVAL_INTRO) &&
999 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 1000 useless = "a variable";
1001 break;
79072805
LW		 1002
1003 case OP_CONST:
11343788 1004 sv = cSVOPo->op_sv;
7a52d87a
GS		 1005 if (cSVOPo->op_private & OPpCONST_STRICT)
1006 no_bareword_allowed(o);
1007 else {
d008e5eb
GS		 1008 dTHR;
1009 if (ckWARN(WARN_VOID)) {
1010 useless = "a constant";
1011 if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
1012 useless = 0;
1013 else if (SvPOK(sv)) {
1014 if (strnEQ(SvPVX(sv), "di", 2) ||
1015 strnEQ(SvPVX(sv), "ds", 2) ||
1016 strnEQ(SvPVX(sv), "ig", 2))
1017 useless = 0;
1018 }
8990e307
LW		 1019 }
1020 }
11343788 1021 null(o); /* don't execute a constant */
8990e307 1022 SvREFCNT_dec(sv); /* don't even remember it */
79072805
LW		 1023 break;
1024
1025 case OP_POSTINC:
11343788 1026 o->op_type = OP_PREINC; /* pre-increment is faster */
22c35a8c 1027 o->op_ppaddr = PL_ppaddr[OP_PREINC];
79072805
LW		 1028 break;
1029
1030 case OP_POSTDEC:
11343788 1031 o->op_type = OP_PREDEC; /* pre-decrement is faster */
22c35a8c 1032 o->op_ppaddr = PL_ppaddr[OP_PREDEC];
79072805
LW		 1033 break;
1034
79072805
LW		 1035 case OP_OR:
1036 case OP_AND:
1037 case OP_COND_EXPR:
11343788 1038 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 1039 scalarvoid(kid);
1040 break;
5aabfad6 1041
a0d0e21e 1042 case OP_NULL:
11343788 1043 if (o->op_flags & OPf_STACKED)
a0d0e21e 1044 break;
5aabfad6 1045 /* FALL THROUGH */
2ebea0a1
GS		 1046 case OP_NEXTSTATE:
1047 case OP_DBSTATE:
79072805
LW		 1048 case OP_ENTERTRY:
1049 case OP_ENTER:
1050 case OP_SCALAR:
11343788 1051 if (!(o->op_flags & OPf_KIDS))
79072805 1052 break;
54310121 1053 /* FALL THROUGH */
463ee0b2 1054 case OP_SCOPE:
79072805
LW		 1055 case OP_LEAVE:
1056 case OP_LEAVETRY:
a0d0e21e 1057 case OP_LEAVELOOP:
79072805 1058 case OP_LINESEQ:
79072805 1059 case OP_LIST:
11343788 1060 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 1061 scalarvoid(kid);
1062 break;
c90c0ff4 1063 case OP_ENTEREVAL:
5196be3e 1064 scalarkids(o);
c90c0ff4 1065 break;
5aabfad6 1066 case OP_REQUIRE:
c90c0ff4 1067 /* all requires must return a boolean value */
5196be3e
MB		 1068 o->op_flags &= ~OPf_WANT;
1069 return scalar(o);
a0d0e21e 1070 case OP_SPLIT:
11343788 1071 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 1072 if (!kPMOP->op_pmreplroot)
1073 deprecate("implicit split to @_");
1074 }
1075 break;
79072805 1076 }
d008e5eb
GS		 1077 if (useless) {
1078 dTHR;
1079 if (ckWARN(WARN_VOID))
cea2e8a9 1080 Perl_warner(aTHX_ WARN_VOID, "Useless use of %s in void context", useless);
d008e5eb 1081 }
11343788 1082 return o;
79072805
LW		 1083}
1084
1085OP *
864dbfa3 1086Perl_listkids(pTHX_ OP *o)
79072805
LW		 1087{
1088 OP *kid;
11343788
MB		 1089 if (o && o->op_flags & OPf_KIDS) {
1090 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 1091 list(kid);
1092 }
11343788 1093 return o;
79072805
LW		 1094}
1095
1096OP *
864dbfa3 1097Perl_list(pTHX_ OP *o)
79072805
LW		 1098{
1099 OP *kid;
1100
a0d0e21e 1101 /* assumes no premature commitment */
3280af22 1102 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 1103 || o->op_type == OP_RETURN)
11343788 1104 return o;
79072805 1105
b162f9ea
IZ		 1106 if ((o->op_private & OPpTARGET_MY)
1107 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
1108 return o; /* As if inside SASSIGN */
1109
5dc0d613 1110 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 1111
11343788 1112 switch (o->op_type) {
79072805
LW		 1113 case OP_FLOP:
1114 case OP_REPEAT:
11343788 1115 list(cBINOPo->op_first);
79072805
LW		 1116 break;
1117 case OP_OR:
1118 case OP_AND:
1119 case OP_COND_EXPR:
11343788 1120 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 1121 list(kid);
1122 break;
1123 default:
1124 case OP_MATCH:
8782bef2 1125 case OP_QR:
79072805
LW		 1126 case OP_SUBST:
1127 case OP_NULL:
11343788 1128 if (!(o->op_flags & OPf_KIDS))
79072805 1129 break;
11343788
MB		 1130 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
1131 list(cBINOPo->op_first);
1132 return gen_constant_list(o);
79072805
LW		 1133 }
1134 case OP_LIST:
11343788 1135 listkids(o);
79072805
LW		 1136 break;
1137 case OP_LEAVE:
1138 case OP_LEAVETRY:
5dc0d613 1139 kid = cLISTOPo->op_first;
54310121 1140 list(kid);
1141 while (kid = kid->op_sibling) {
1142 if (kid->op_sibling)
1143 scalarvoid(kid);
1144 else
1145 list(kid);
1146 }
3280af22 1147 WITH_THR(PL_curcop = &PL_compiling);
54310121 1148 break;
748a9306 1149 case OP_SCOPE:
79072805 1150 case OP_LINESEQ:
11343788 1151 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 1152 if (kid->op_sibling)
1153 scalarvoid(kid);
1154 else
1155 list(kid);
1156 }
3280af22 1157 WITH_THR(PL_curcop = &PL_compiling);
79072805 1158 break;
c90c0ff4 1159 case OP_REQUIRE:
1160 /* all requires must return a boolean value */
5196be3e
MB		 1161 o->op_flags &= ~OPf_WANT;
1162 return scalar(o);
79072805 1163 }
11343788 1164 return o;
79072805
LW		 1165}
1166
1167OP *
864dbfa3 1168Perl_scalarseq(pTHX_ OP *o)
79072805
LW		 1169{
1170 OP *kid;
1171
11343788
MB		 1172 if (o) {
1173 if (o->op_type == OP_LINESEQ ||
1174 o->op_type == OP_SCOPE ||
1175 o->op_type == OP_LEAVE ||
1176 o->op_type == OP_LEAVETRY)
463ee0b2 1177 {
0f15f207 1178 dTHR;
11343788 1179 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 1180 if (kid->op_sibling) {
463ee0b2 1181 scalarvoid(kid);
ed6116ce 1182 }
463ee0b2 1183 }
3280af22 1184 PL_curcop = &PL_compiling;
79072805 1185 }
11343788 1186 o->op_flags &= ~OPf_PARENS;
3280af22 1187 if (PL_hints & HINT_BLOCK_SCOPE)
11343788 1188 o->op_flags |= OPf_PARENS;
79072805 1189 }
8990e307 1190 else
11343788
MB		 1191 o = newOP(OP_STUB, 0);
1192 return o;
79072805
LW		 1193}
1194
76e3520e 1195STATIC OP *
cea2e8a9 1196S_modkids(pTHX_ OP *o, I32 type)
79072805
LW		 1197{
1198 OP *kid;
11343788
MB		 1199 if (o && o->op_flags & OPf_KIDS) {
1200 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 1201 mod(kid, type);
79072805 1202 }
11343788 1203 return o;
79072805
LW		 1204}
1205
79072805 1206OP *
864dbfa3 1207Perl_mod(pTHX_ OP *o, I32 type)
79072805 1208{
11343788 1209 dTHR;
79072805
LW		 1210 OP *kid;
1211 SV *sv;
2d8e6c8d 1212 STRLEN n_a;
79072805 1213
3280af22 1214 if (!o || PL_error_count)
11343788 1215 return o;
79072805 1216
b162f9ea
IZ		 1217 if ((o->op_private & OPpTARGET_MY)
1218 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
1219 return o;
1220
11343788 1221 switch (o->op_type) {
68dc0745 1222 case OP_UNDEF:
3280af22 1223 PL_modcount++;
5dc0d613 1224 return o;
a0d0e21e 1225 case OP_CONST:
11343788 1226 if (!(o->op_private & (OPpCONST_ARYBASE)))
a0d0e21e 1227 goto nomod;
3280af22
NIS		 1228 if (PL_eval_start && PL_eval_start->op_type == OP_CONST) {
1229 PL_compiling.cop_arybase = (I32)SvIV(((SVOP*)PL_eval_start)->op_sv);
1230 PL_eval_start = 0;
a0d0e21e
LW		 1231 }
1232 else if (!type) {
3280af22
NIS		 1233 SAVEI32(PL_compiling.cop_arybase);
1234 PL_compiling.cop_arybase = 0;
a0d0e21e
LW		 1235 }
1236 else if (type == OP_REFGEN)
1237 goto nomod;
1238 else
cea2e8a9 1239 Perl_croak(aTHX_ "That use of $[ is unsupported");
a0d0e21e 1240 break;
5f05dabc 1241 case OP_STUB:
5196be3e 1242 if (o->op_flags & OPf_PARENS)
5f05dabc 1243 break;
1244 goto nomod;
a0d0e21e
LW		 1245 case OP_ENTERSUB:
1246 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1247 !(o->op_flags & OPf_STACKED)) {
1248 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1249 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788
MB		 1250 assert(cUNOPo->op_first->op_type == OP_NULL);
1251 null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1252 break;
1253 }
1254 /* FALL THROUGH */
1255 default:
a0d0e21e
LW		 1256 nomod:
1257 /* grep, foreach, subcalls, refgen */
1258 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
1259 break;
cea2e8a9 1260 yyerror(Perl_form(aTHX_ "Can't modify %s in %s",
638bc118 1261 (o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL)
22c35a8c
GS		 1262 ? "do block" : PL_op_desc[o->op_type]),
1263 type ? PL_op_desc[type] : "local"));
11343788 1264 return o;
79072805 1265
a0d0e21e
LW		 1266 case OP_PREINC:
1267 case OP_PREDEC:
1268 case OP_POW:
1269 case OP_MULTIPLY:
1270 case OP_DIVIDE:
1271 case OP_MODULO:
1272 case OP_REPEAT:
1273 case OP_ADD:
1274 case OP_SUBTRACT:
1275 case OP_CONCAT:
1276 case OP_LEFT_SHIFT:
1277 case OP_RIGHT_SHIFT:
1278 case OP_BIT_AND:
1279 case OP_BIT_XOR:
1280 case OP_BIT_OR:
1281 case OP_I_MULTIPLY:
1282 case OP_I_DIVIDE:
1283 case OP_I_MODULO:
1284 case OP_I_ADD:
1285 case OP_I_SUBTRACT:
11343788 1286 if (!(o->op_flags & OPf_STACKED))
a0d0e21e 1287 goto nomod;
3280af22 1288 PL_modcount++;
a0d0e21e
LW		 1289 break;
1290
79072805 1291 case OP_COND_EXPR:
11343788 1292 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1293 mod(kid, type);
79072805
LW		 1294 break;
1295
1296 case OP_RV2AV:
1297 case OP_RV2HV:
93af7a87 1298 if (!type && cUNOPo->op_first->op_type != OP_GV)
cea2e8a9 1299 Perl_croak(aTHX_ "Can't localize through a reference");
11343788 1300 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
3280af22 1301 PL_modcount = 10000;
11343788 1302 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1303 }
1304 /* FALL THROUGH */
79072805 1305 case OP_RV2GV:
5dc0d613 1306 if (scalar_mod_type(o, type))
3fe9a6f1 1307 goto nomod;
11343788 1308 ref(cUNOPo->op_first, o->op_type);
79072805
LW		 1309 /* FALL THROUGH */
1310 case OP_AASSIGN:
1311 case OP_ASLICE:
1312 case OP_HSLICE:
93a17b20
LW		 1313 case OP_NEXTSTATE:
1314 case OP_DBSTATE:
a0d0e21e
LW		 1315 case OP_REFGEN:
1316 case OP_CHOMP:
3280af22 1317 PL_modcount = 10000;
79072805 1318 break;
463ee0b2 1319 case OP_RV2SV:
11343788 1320 if (!type && cUNOPo->op_first->op_type != OP_GV)
cea2e8a9 1321 Perl_croak(aTHX_ "Can't localize through a reference");
aeea060c 1322 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1323 /* FALL THROUGH */
79072805 1324 case OP_GV:
463ee0b2 1325 case OP_AV2ARYLEN:
3280af22 1326 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1327 case OP_SASSIGN:
bf4b1e52
GS		 1328 case OP_ANDASSIGN:
1329 case OP_ORASSIGN:
8990e307 1330 case OP_AELEMFAST:
3280af22 1331 PL_modcount++;
8990e307
LW		 1332 break;
1333
748a9306
LW		 1334 case OP_PADAV:
1335 case OP_PADHV:
3280af22 1336 PL_modcount = 10000;
5196be3e
MB		 1337 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1338 return o; /* Treat \(@foo) like ordinary list. */
1339 if (scalar_mod_type(o, type))
3fe9a6f1 1340 goto nomod;
748a9306
LW		 1341 /* FALL THROUGH */
1342 case OP_PADSV:
3280af22 1343 PL_modcount++;
748a9306 1344 if (!type)
cea2e8a9 1345 Perl_croak(aTHX_ "Can't localize lexical variable %s",
2d8e6c8d 1346 SvPV(*av_fetch(PL_comppad_name, o->op_targ, 4), n_a));
463ee0b2
LW		 1347 break;
1348
554b3eca 1349#ifdef USE_THREADS
2faa37cc 1350 case OP_THREADSV:
533c011a 1351 PL_modcount++; /* XXX ??? */
554b3eca
MB		 1352 break;
1353#endif /* USE_THREADS */
1354
748a9306
LW		 1355 case OP_PUSHMARK:
1356 break;
a0d0e21e 1357
69969c6f
SB		 1358 case OP_KEYS:
1359 if (type != OP_SASSIGN)
1360 goto nomod;
5d82c453
GA		 1361 goto lvalue_func;
1362 case OP_SUBSTR:
1363 if (o->op_private == 4) /* don't allow 4 arg substr as lvalue */
1364 goto nomod;
5f05dabc 1365 /* FALL THROUGH */
a0d0e21e 1366 case OP_POS:
463ee0b2 1367 case OP_VEC:
5d82c453 1368 lvalue_func:
11343788
MB		 1369 pad_free(o->op_targ);
1370 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1371 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1372 if (o->op_flags & OPf_KIDS)
1373 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1374 break;
a0d0e21e 1375
463ee0b2
LW		 1376 case OP_AELEM:
1377 case OP_HELEM:
11343788 1378 ref(cBINOPo->op_first, o->op_type);
68dc0745 1379 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1380 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1381 o->op_private |= OPpLVAL_DEFER;
3280af22 1382 PL_modcount++;
463ee0b2
LW		 1383 break;
1384
1385 case OP_SCOPE:
1386 case OP_LEAVE:
1387 case OP_ENTER:
11343788
MB		 1388 if (o->op_flags & OPf_KIDS)
1389 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1390 break;
1391
1392 case OP_NULL:
638bc118
GS		 1393 if (o->op_flags & OPf_SPECIAL) /* do BLOCK */
1394 goto nomod;
1395 else if (!(o->op_flags & OPf_KIDS))
463ee0b2 1396 break;
11343788
MB		 1397 if (o->op_targ != OP_LIST) {
1398 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1399 break;
1400 }
1401 /* FALL THROUGH */
463ee0b2 1402 case OP_LIST:
11343788 1403 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1404 mod(kid, type);
1405 break;
1406 }
11343788 1407 o->op_flags |= OPf_MOD;
a0d0e21e
LW		 1408
1409 if (type == OP_AASSIGN || type == OP_SASSIGN)
11343788 1410 o->op_flags |= OPf_SPECIAL|OPf_REF;
a0d0e21e 1411 else if (!type) {
11343788
MB		 1412 o->op_private |= OPpLVAL_INTRO;
1413 o->op_flags &= ~OPf_SPECIAL;
3280af22 1414 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1415 }
a0d0e21e 1416 else if (type != OP_GREPSTART && type != OP_ENTERSUB)
11343788
MB		 1417 o->op_flags |= OPf_REF;
1418 return o;
463ee0b2
LW		 1419}
1420
864dbfa3 1421STATIC bool
cea2e8a9 1422S_scalar_mod_type(pTHX_ OP *o, I32 type)
3fe9a6f1 1423{
1424 switch (type) {
1425 case OP_SASSIGN:
5196be3e 1426 if (o->op_type == OP_RV2GV)
3fe9a6f1 1427 return FALSE;
1428 /* FALL THROUGH */
1429 case OP_PREINC:
1430 case OP_PREDEC:
1431 case OP_POSTINC:
1432 case OP_POSTDEC:
1433 case OP_I_PREINC:
1434 case OP_I_PREDEC:
1435 case OP_I_POSTINC:
1436 case OP_I_POSTDEC:
1437 case OP_POW:
1438 case OP_MULTIPLY:
1439 case OP_DIVIDE:
1440 case OP_MODULO:
1441 case OP_REPEAT:
1442 case OP_ADD:
1443 case OP_SUBTRACT:
1444 case OP_I_MULTIPLY:
1445 case OP_I_DIVIDE:
1446 case OP_I_MODULO:
1447 case OP_I_ADD:
1448 case OP_I_SUBTRACT:
1449 case OP_LEFT_SHIFT:
1450 case OP_RIGHT_SHIFT:
1451 case OP_BIT_AND:
1452 case OP_BIT_XOR:
1453 case OP_BIT_OR:
1454 case OP_CONCAT:
1455 case OP_SUBST:
1456 case OP_TRANS:
49e9fbe6
GS		 1457 case OP_READ:
1458 case OP_SYSREAD:
1459 case OP_RECV:
bf4b1e52
GS		 1460 case OP_ANDASSIGN:
1461 case OP_ORASSIGN:
3fe9a6f1 1462 return TRUE;
1463 default:
1464 return FALSE;
1465 }
1466}
1467
35cd451c 1468STATIC bool
cea2e8a9 1469S_is_handle_constructor(pTHX_ OP *o, I32 argnum)
35cd451c
GS		 1470{
1471 switch (o->op_type) {
1472 case OP_PIPE_OP:
1473 case OP_SOCKPAIR:
1474 if (argnum == 2)
1475 return TRUE;
1476 /* FALL THROUGH */
1477 case OP_SYSOPEN:
1478 case OP_OPEN:
ded8aa31 1479 case OP_SELECT: /* XXX c.f. SelectSaver.pm */
35cd451c
GS		 1480 case OP_SOCKET:
1481 case OP_OPEN_DIR:
1482 case OP_ACCEPT:
1483 if (argnum == 1)
1484 return TRUE;
1485 /* FALL THROUGH */
1486 default:
1487 return FALSE;
1488 }
1489}
1490
463ee0b2 1491OP *
864dbfa3 1492Perl_refkids(pTHX_ OP *o, I32 type)
463ee0b2
LW		 1493{
1494 OP *kid;
11343788
MB		 1495 if (o && o->op_flags & OPf_KIDS) {
1496 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1497 ref(kid, type);
1498 }
11343788 1499 return o;
463ee0b2
LW		 1500}
1501
1502OP *
864dbfa3 1503Perl_ref(pTHX_ OP *o, I32 type)
463ee0b2
LW		 1504{
1505 OP *kid;
463ee0b2 1506
3280af22 1507 if (!o || PL_error_count)
11343788 1508 return o;
463ee0b2 1509
11343788 1510 switch (o->op_type) {
a0d0e21e 1511 case OP_ENTERSUB:
e55aaa0e 1512 if ((type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1513 !(o->op_flags & OPf_STACKED)) {
1514 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1515 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788
MB		 1516 assert(cUNOPo->op_first->op_type == OP_NULL);
1517 null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
1518 o->op_flags |= OPf_SPECIAL;
8990e307
LW		 1519 }
1520 break;
aeea060c 1521
463ee0b2 1522 case OP_COND_EXPR:
11343788 1523 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2
LW		 1524 ref(kid, type);
1525 break;
8990e307 1526 case OP_RV2SV:
35cd451c
GS		 1527 if (type == OP_DEFINED)
1528 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1529 ref(cUNOPo->op_first, o->op_type);
4633a7c4
LW		 1530 /* FALL THROUGH */
1531 case OP_PADSV:
5f05dabc 1532 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1533 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1534 : type == OP_RV2HV ? OPpDEREF_HV
1535 : OPpDEREF_SV);
11343788 1536 o->op_flags |= OPf_MOD;
a0d0e21e 1537 }
8990e307
LW		 1538 break;
1539
2faa37cc 1540 case OP_THREADSV:
a863c7d1
MB		 1541 o->op_flags |= OPf_MOD; /* XXX ??? */
1542 break;
1543
463ee0b2
LW		 1544 case OP_RV2AV:
1545 case OP_RV2HV:
aeea060c 1546 o->op_flags |= OPf_REF;
8990e307 1547 /* FALL THROUGH */
463ee0b2 1548 case OP_RV2GV:
35cd451c
GS		 1549 if (type == OP_DEFINED)
1550 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1551 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1552 break;
8990e307 1553
463ee0b2
LW		 1554 case OP_PADAV:
1555 case OP_PADHV:
aeea060c 1556 o->op_flags |= OPf_REF;
79072805 1557 break;
aeea060c 1558
8990e307 1559 case OP_SCALAR:
79072805 1560 case OP_NULL:
11343788 1561 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1562 break;
11343788 1563 ref(cBINOPo->op_first, type);
79072805
LW		 1564 break;
1565 case OP_AELEM:
1566 case OP_HELEM:
11343788 1567 ref(cBINOPo->op_first, o->op_type);
5f05dabc 1568 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1569 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1570 : type == OP_RV2HV ? OPpDEREF_HV
1571 : OPpDEREF_SV);
11343788 1572 o->op_flags |= OPf_MOD;
8990e307 1573 }
79072805
LW		 1574 break;
1575
463ee0b2 1576 case OP_SCOPE:
79072805
LW		 1577 case OP_LEAVE:
1578 case OP_ENTER:
8990e307 1579 case OP_LIST:
11343788 1580 if (!(o->op_flags & OPf_KIDS))
79072805 1581 break;
11343788 1582 ref(cLISTOPo->op_last, type);
79072805 1583 break;
a0d0e21e
LW		 1584 default:
1585 break;
79072805 1586 }
11343788 1587 return scalar(o);
8990e307 1588
79072805
LW		 1589}
1590
1591OP *
864dbfa3 1592Perl_my(pTHX_ OP *o)
93a17b20
LW		 1593{
1594 OP *kid;
93a17b20
LW		 1595 I32 type;
1596
3280af22 1597 if (!o || PL_error_count)
11343788 1598 return o;
93a17b20 1599
11343788 1600 type = o->op_type;
93a17b20 1601 if (type == OP_LIST) {
11343788 1602 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
93a17b20 1603 my(kid);
dab48698 1604 } else if (type == OP_UNDEF) {
7766148a 1605 return o;
dab48698 1606 } else if (type != OP_PADSV &&
93a17b20
LW		 1607 type != OP_PADAV &&
1608 type != OP_PADHV &&
1609 type != OP_PUSHMARK)
1610 {
cea2e8a9 1611 yyerror(Perl_form(aTHX_ "Can't declare %s in my", PL_op_desc[o->op_type]));
11343788 1612 return o;
93a17b20 1613 }
11343788
MB		 1614 o->op_flags |= OPf_MOD;
1615 o->op_private |= OPpLVAL_INTRO;
1616 return o;
93a17b20
LW		 1617}
1618
1619OP *
864dbfa3 1620Perl_sawparens(pTHX_ OP *o)
79072805
LW		 1621{
1622 if (o)
1623 o->op_flags |= OPf_PARENS;
1624 return o;
1625}
1626
1627OP *
864dbfa3 1628Perl_bind_match(pTHX_ I32 type, OP *left, OP *right)
79072805 1629{
d008e5eb 1630 dTHR;
11343788 1631 OP *o;
79072805 1632
599cee73
PM		 1633 if (ckWARN(WARN_UNSAFE) &&
1634 (left->op_type == OP_RV2AV ||
1635 left->op_type == OP_RV2HV ||
1636 left->op_type == OP_PADAV ||
1637 left->op_type == OP_PADHV)) {
22c35a8c 1638 char *desc = PL_op_desc[(right->op_type == OP_SUBST ||
599cee73
PM		 1639 right->op_type == OP_TRANS)
1640 ? right->op_type : OP_MATCH];
1641 char *sample = ((left->op_type == OP_RV2AV ||
1642 left->op_type == OP_PADAV)
1643 ? "@array" : "%hash");
cea2e8a9 1644 Perl_warner(aTHX_ WARN_UNSAFE,
599cee73
PM		 1645 "Applying %s to %s will act on scalar(%s)",
1646 desc, sample, sample);
2ae324a7 1647 }
1648
79072805
LW		 1649 if (right->op_type == OP_MATCH ||
1650 right->op_type == OP_SUBST ||
1651 right->op_type == OP_TRANS) {
1652 right->op_flags |= OPf_STACKED;
1653 if (right->op_type != OP_MATCH)
463ee0b2 1654 left = mod(left, right->op_type);
79072805 1655 if (right->op_type == OP_TRANS)
11343788 1656 o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805 1657 else
11343788 1658 o = prepend_elem(right->op_type, scalar(left), right);
79072805 1659 if (type == OP_NOT)
11343788
MB		 1660 return newUNOP(OP_NOT, 0, scalar(o));
1661 return o;
79072805
LW		 1662 }
1663 else
1664 return bind_match(type, left,
1665 pmruntime(newPMOP(OP_MATCH, 0), right, Nullop));
1666}
1667
1668OP *
864dbfa3 1669Perl_invert(pTHX_ OP *o)
79072805 1670{
11343788
MB		 1671 if (!o)
1672 return o;
79072805 1673 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
11343788 1674 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1675}
1676
1677OP *
864dbfa3 1678Perl_scope(pTHX_ OP *o)
79072805
LW		 1679{
1680 if (o) {
3280af22 1681 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || PL_tainting) {
463ee0b2
LW		 1682 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1683 o->op_type = OP_LEAVE;
22c35a8c 1684 o->op_ppaddr = PL_ppaddr[OP_LEAVE];
463ee0b2
LW		 1685 }
1686 else {
1687 if (o->op_type == OP_LINESEQ) {
1688 OP *kid;
1689 o->op_type = OP_SCOPE;
22c35a8c 1690 o->op_ppaddr = PL_ppaddr[OP_SCOPE];
463ee0b2 1691 kid = ((LISTOP*)o)->op_first;
748a9306 1692 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE){
7399586d
HS		 1693 if (kid->op_targ > 0)
1694 pad_free(kid->op_targ);
1695 kid->op_targ = kid->op_type;
1696 kid->op_type = OP_SETSTATE;
1697 kid->op_ppaddr = PL_ppaddr[OP_SETSTATE];
748a9306 1698 }
463ee0b2
LW		 1699 }
1700 else
748a9306 1701 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
463ee0b2 1702 }
79072805
LW		 1703 }
1704 return o;
1705}
1706
b3ac6de7 1707void
864dbfa3 1708Perl_save_hints(pTHX)
b3ac6de7 1709{
3280af22
NIS		 1710 SAVEI32(PL_hints);
1711 SAVESPTR(GvHV(PL_hintgv));
1712 GvHV(PL_hintgv) = newHVhv(GvHV(PL_hintgv));
1713 SAVEFREESV(GvHV(PL_hintgv));
b3ac6de7
IZ		 1714}
1715
a0d0e21e 1716int
864dbfa3 1717Perl_block_start(pTHX_ int full)
79072805 1718{
11343788 1719 dTHR;
3280af22 1720 int retval = PL_savestack_ix;
b3ac6de7 1721
3280af22 1722 SAVEI32(PL_comppad_name_floor);
55497cff 1723 if (full) {
3280af22
NIS		 1724 if ((PL_comppad_name_fill = AvFILLp(PL_comppad_name)) > 0)
1725 PL_comppad_name_floor = PL_comppad_name_fill;
55497cff 1726 else
3280af22
NIS		 1727 PL_comppad_name_floor = 0;
1728 }
1729 SAVEI32(PL_min_intro_pending);
1730 SAVEI32(PL_max_intro_pending);
1731 PL_min_intro_pending = 0;
1732 SAVEI32(PL_comppad_name_fill);
1733 SAVEI32(PL_padix_floor);
1734 PL_padix_floor = PL_padix;
1735 PL_pad_reset_pending = FALSE;
b3ac6de7 1736 SAVEHINTS();
3280af22 1737 PL_hints &= ~HINT_BLOCK_SCOPE;
e24b16f9 1738 SAVEPPTR(PL_compiling.cop_warnings);
0453d815 1739 if (! specialWARN(PL_compiling.cop_warnings)) {
599cee73
PM		 1740 PL_compiling.cop_warnings = newSVsv(PL_compiling.cop_warnings) ;
1741 SAVEFREESV(PL_compiling.cop_warnings) ;
1742 }
1743
1744
a0d0e21e
LW		 1745 return retval;
1746}
1747
1748OP*
864dbfa3 1749Perl_block_end(pTHX_ I32 floor, OP *seq)
a0d0e21e 1750{
11343788 1751 dTHR;
3280af22 1752 int needblockscope = PL_hints & HINT_BLOCK_SCOPE;
a0d0e21e 1753 OP* retval = scalarseq(seq);
a0d0e21e 1754 LEAVE_SCOPE(floor);
3280af22 1755 PL_pad_reset_pending = FALSE;
e24b16f9 1756 PL_compiling.op_private = PL_hints;
a0d0e21e 1757 if (needblockscope)
3280af22
NIS		 1758 PL_hints |= HINT_BLOCK_SCOPE; /* propagate out */
1759 pad_leavemy(PL_comppad_name_fill);
1760 PL_cop_seqmax++;
a0d0e21e
LW		 1761 return retval;
1762}
1763
76e3520e 1764STATIC OP *
cea2e8a9 1765S_newDEFSVOP(pTHX)
54b9620d
MB		 1766{
1767#ifdef USE_THREADS
1768 OP *o = newOP(OP_THREADSV, 0);
1769 o->op_targ = find_threadsv("_");
1770 return o;
1771#else
3280af22 1772 return newSVREF(newGVOP(OP_GV, 0, PL_defgv));
54b9620d
MB		 1773#endif /* USE_THREADS */
1774}
1775
a0d0e21e 1776void
864dbfa3 1777Perl_newPROG(pTHX_ OP *o)
a0d0e21e 1778{
11343788 1779 dTHR;
3280af22 1780 if (PL_in_eval) {
b295d113
TH		 1781 if (PL_eval_root)
1782 return;
faef0170
HS		 1783 PL_eval_root = newUNOP(OP_LEAVEEVAL,
1784 ((PL_in_eval & EVAL_KEEPERR)
1785 ? OPf_SPECIAL : 0), o);
3280af22
NIS		 1786 PL_eval_start = linklist(PL_eval_root);
1787 PL_eval_root->op_next = 0;
1788 peep(PL_eval_start);
a0d0e21e
LW		 1789 }
1790 else {
5dc0d613 1791 if (!o)
a0d0e21e 1792 return;
3280af22
NIS		 1793 PL_main_root = scope(sawparens(scalarvoid(o)));
1794 PL_curcop = &PL_compiling;
1795 PL_main_start = LINKLIST(PL_main_root);
1796 PL_main_root->op_next = 0;
1797 peep(PL_main_start);
1798 PL_compcv = 0;
3841441e 1799
4fdae800 1800 /* Register with debugger */
84902520 1801 if (PERLDB_INTER) {
864dbfa3 1802 CV *cv = get_cv("DB::postponed", FALSE);
3841441e
CS		 1803 if (cv) {
1804 dSP;
924508f0 1805 PUSHMARK(SP);
3280af22 1806 XPUSHs((SV*)PL_compiling.cop_filegv);
3841441e 1807 PUTBACK;
864dbfa3 1808 call_sv((SV*)cv, G_DISCARD);
3841441e
CS		 1809 }
1810 }
79072805 1811 }
79072805
LW		 1812}
1813
1814OP *
864dbfa3 1815Perl_localize(pTHX_ OP *o, I32 lex)
79072805
LW		 1816{
1817 if (o->op_flags & OPf_PARENS)
1818 list(o);
8990e307 1819 else {
d008e5eb 1820 dTHR;
599cee73 1821 if (ckWARN(WARN_PARENTHESIS) && PL_bufptr > PL_oldbufptr && PL_bufptr[-1] == ',') {
8990e307 1822 char *s;
834a4ddd 1823 for (s = PL_bufptr; *s && (isALNUM(*s) || (*s & 0x80) || strchr("@$%, ",*s)); s++) ;
a0d0e21e 1824 if (*s == ';' || *s == '=')
cea2e8a9 1825 Perl_warner(aTHX_ WARN_PARENTHESIS, "Parentheses missing around \"%s\" list",
599cee73 1826 lex ? "my" : "local");
8990e307
LW		 1827 }
1828 }
3280af22
NIS		 1829 PL_in_my = FALSE;
1830 PL_in_my_stash = Nullhv;
93a17b20
LW		 1831 if (lex)
1832 return my(o);
1833 else
463ee0b2 1834 return mod(o, OP_NULL); /* a bit kludgey */
79072805
LW		 1835}
1836
1837OP *
864dbfa3 1838Perl_jmaybe(pTHX_ OP *o)
79072805
LW		 1839{
1840 if (o->op_type == OP_LIST) {
554b3eca
MB		 1841 OP *o2;
1842#ifdef USE_THREADS
2faa37cc 1843 o2 = newOP(OP_THREADSV, 0);
54b9620d 1844 o2->op_targ = find_threadsv(";");
554b3eca
MB		 1845#else
1846 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
1847#endif /* USE_THREADS */
1848 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 1849 }
1850 return o;
1851}
1852
1853OP *
864dbfa3 1854Perl_fold_constants(pTHX_ register OP *o)
79072805 1855{
11343788 1856 dTHR;
79072805
LW		 1857 register OP *curop;
1858 I32 type = o->op_type;
748a9306 1859 SV *sv;
79072805 1860
22c35a8c 1861 if (PL_opargs[type] & OA_RETSCALAR)
79072805 1862 scalar(o);
b162f9ea 1863 if (PL_opargs[type] & OA_TARGET && !o->op_targ)
ed6116ce 1864 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 1865
eac055e9
GS		 1866 /* integerize op, unless it happens to be C<-foo>.
1867 * XXX should pp_i_negate() do magic string negation instead? */
1868 if ((PL_opargs[type] & OA_OTHERINT) && (PL_hints & HINT_INTEGER)
1869 && !(type == OP_NEGATE && cUNOPo->op_first->op_type == OP_CONST
1870 && (cUNOPo->op_first->op_private & OPpCONST_BARE)))
1871 {
22c35a8c 1872 o->op_ppaddr = PL_ppaddr[type = ++(o->op_type)];
eac055e9 1873 }
85e6fe83 1874
22c35a8c 1875 if (!(PL_opargs[type] & OA_FOLDCONST))
79072805
LW		 1876 goto nope;
1877
de939608 1878 switch (type) {
7a52d87a
GS		 1879 case OP_NEGATE:
1880 /* XXX might want a ck_negate() for this */
1881 cUNOPo->op_first->op_private &= ~OPpCONST_STRICT;
1882 break;
de939608
CS		 1883 case OP_SPRINTF:
1884 case OP_UCFIRST:
1885 case OP_LCFIRST:
1886 case OP_UC:
1887 case OP_LC:
69dcf70c
MB		 1888 case OP_SLT:
1889 case OP_SGT:
1890 case OP_SLE:
1891 case OP_SGE:
1892 case OP_SCMP:
1893
de939608
CS		 1894 if (o->op_private & OPpLOCALE)
1895 goto nope;
1896 }
1897
3280af22 1898 if (PL_error_count)
a0d0e21e
LW		 1899 goto nope; /* Don't try to run w/ errors */
1900
79072805 1901 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
93a17b20 1902 if (curop->op_type != OP_CONST &&
7a52d87a
GS		 1903 curop->op_type != OP_LIST &&
1904 curop->op_type != OP_SCALAR &&
1905 curop->op_type != OP_NULL &&
1906 curop->op_type != OP_PUSHMARK)
1907 {
79072805
LW		 1908 goto nope;
1909 }
1910 }
1911
1912 curop = LINKLIST(o);
1913 o->op_next = 0;
533c011a 1914 PL_op = curop;
cea2e8a9 1915 CALLRUNOPS(aTHX);
3280af22 1916 sv = *(PL_stack_sp--);
748a9306 1917 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
79072805 1918 pad_swipe(o->op_targ);
748a9306
LW		 1919 else if (SvTEMP(sv)) { /* grab mortal temp? */
1920 (void)SvREFCNT_inc(sv);
1921 SvTEMP_off(sv);
85e6fe83 1922 }
79072805
LW		 1923 op_free(o);
1924 if (type == OP_RV2GV)
b1cb66bf 1925 return newGVOP(OP_GV, 0, (GV*)sv);
748a9306 1926 else {
ee580363
GS		 1927 /* try to smush double to int, but don't smush -2.0 to -2 */
1928 if ((SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK)) == SVf_NOK &&
1929 type != OP_NEGATE)
1930 {
748a9306 1931 IV iv = SvIV(sv);
65202027 1932 if ((NV)iv == SvNV(sv)) {
748a9306
LW		 1933 SvREFCNT_dec(sv);
1934 sv = newSViv(iv);
1935 }
b1cb66bf 1936 else
1937 SvIOK_off(sv); /* undo SvIV() damage */
748a9306
LW		 1938 }
1939 return newSVOP(OP_CONST, 0, sv);
1940 }
aeea060c 1941
79072805 1942 nope:
22c35a8c 1943 if (!(PL_opargs[type] & OA_OTHERINT))
79072805 1944 return o;
79072805 1945
3280af22 1946 if (!(PL_hints & HINT_INTEGER)) {
a0d0e21e 1947 if (type == OP_DIVIDE || !(o->op_flags & OPf_KIDS))
85e6fe83
LW		 1948 return o;
1949
1950 for (curop = ((UNOP*)o)->op_first; curop; curop = curop->op_sibling) {
1951 if (curop->op_type == OP_CONST) {
b1cb66bf 1952 if (SvIOK(((SVOP*)curop)->op_sv))
85e6fe83
LW		 1953 continue;
1954 return o;
1955 }
22c35a8c 1956 if (PL_opargs[curop->op_type] & OA_RETINTEGER)
79072805
LW		 1957 continue;
1958 return o;
1959 }
22c35a8c 1960 o->op_ppaddr = PL_ppaddr[++(o->op_type)];
79072805
LW		 1961 }
1962
79072805
LW		 1963 return o;
1964}
1965
1966OP *
864dbfa3 1967Perl_gen_constant_list(pTHX_ register OP *o)
79072805 1968{
11343788 1969 dTHR;
79072805 1970 register OP *curop;
3280af22 1971 I32 oldtmps_floor = PL_tmps_floor;
79072805 1972
a0d0e21e 1973 list(o);
3280af22 1974 if (PL_error_count)
a0d0e21e
LW		 1975 return o; /* Don't attempt to run with errors */
1976
533c011a 1977 PL_op = curop = LINKLIST(o);
a0d0e21e 1978 o->op_next = 0;
cea2e8a9
GS		 1979 pp_pushmark();
1980 CALLRUNOPS(aTHX);
533c011a 1981 PL_op = curop;
cea2e8a9 1982 pp_anonlist();
3280af22 1983 PL_tmps_floor = oldtmps_floor;
79072805
LW		 1984
1985 o->op_type = OP_RV2AV;
22c35a8c 1986 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
79072805 1987 curop = ((UNOP*)o)->op_first;
3280af22 1988 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*PL_stack_sp--));
79072805 1989 op_free(curop);
79072805
LW		 1990 linklist(o);
1991 return list(o);
1992}
1993
1994OP *
864dbfa3 1995Perl_convert(pTHX_ I32 type, I32 flags, OP *o)
79072805
LW		 1996{
1997 OP *kid;
a0d0e21e 1998 OP *last = 0;
79072805 1999
11343788
MB		 2000 if (!o || o->op_type != OP_LIST)
2001 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 2002 else
5dc0d613 2003 o->op_flags &= ~OPf_WANT;
79072805 2004
22c35a8c 2005 if (!(PL_opargs[type] & OA_MARK))
11343788 2006 null(cLISTOPo->op_first);
8990e307 2007
11343788 2008 o->op_type = type;
22c35a8c 2009 o->op_ppaddr = PL_ppaddr[type];
11343788 2010 o->op_flags |= flags;
79072805 2011
11343788
MB		 2012 o = CHECKOP(type, o);
2013 if (o->op_type != type)
2014 return o;
79072805 2015
11343788 2016 if (cLISTOPo->op_children < 7) {
79072805 2017 /* XXX do we really need to do this if we're done appending?? */
11343788 2018 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805 2019 last = kid;
11343788 2020 cLISTOPo->op_last = last; /* in case check substituted last arg */
79072805
LW		 2021 }
2022
11343788 2023 return fold_constants(o);
79072805
LW		 2024}
2025
2026/* List constructors */
2027
2028OP *
864dbfa3 2029Perl_append_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2030{
2031 if (!first)
2032 return last;
8990e307
LW		 2033
2034 if (!last)
79072805 2035 return first;
8990e307 2036
a0d0e21e
LW		 2037 if (first->op_type != type || type==OP_LIST && first->op_flags & OPf_PARENS)
2038 return newLISTOP(type, 0, first, last);
79072805 2039
a0d0e21e
LW		 2040 if (first->op_flags & OPf_KIDS)
2041 ((LISTOP*)first)->op_last->op_sibling = last;
2042 else {
2043 first->op_flags |= OPf_KIDS;
2044 ((LISTOP*)first)->op_first = last;
2045 }
2046 ((LISTOP*)first)->op_last = last;
2047 ((LISTOP*)first)->op_children++;
2048 return first;
79072805
LW		 2049}
2050
2051OP *
864dbfa3 2052Perl_append_list(pTHX_ I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 2053{
2054 if (!first)
2055 return (OP*)last;
8990e307
LW		 2056
2057 if (!last)
79072805 2058 return (OP*)first;
8990e307
LW		 2059
2060 if (first->op_type != type)
79072805 2061 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307
LW		 2062
2063 if (last->op_type != type)
79072805
LW		 2064 return append_elem(type, (OP*)first, (OP*)last);
2065
2066 first->op_last->op_sibling = last->op_first;
2067 first->op_last = last->op_last;
2068 first->op_children += last->op_children;
2069 if (first->op_children)
acb74605 2070 first->op_flags |= OPf_KIDS;
b7dc083c
NIS		 2071
2072#ifdef PL_OP_SLAB_ALLOC
2073#else
2074 Safefree(last);
2075#endif
79072805
LW		 2076 return (OP*)first;
2077}
2078
2079OP *
864dbfa3 2080Perl_prepend_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2081{
2082 if (!first)
2083 return last;
8990e307
LW		 2084
2085 if (!last)
79072805 2086 return first;
8990e307
LW		 2087
2088 if (last->op_type == type) {
2089 if (type == OP_LIST) { /* already a PUSHMARK there */
2090 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
2091 ((LISTOP*)last)->op_first->op_sibling = first;
2092 }
2093 else {
2094 if (!(last->op_flags & OPf_KIDS)) {
2095 ((LISTOP*)last)->op_last = first;
2096 last->op_flags |= OPf_KIDS;
2097 }
2098 first->op_sibling = ((LISTOP*)last)->op_first;
2099 ((LISTOP*)last)->op_first = first;
79072805 2100 }
79072805
LW		 2101 ((LISTOP*)last)->op_children++;
2102 return last;
2103 }
2104
2105 return newLISTOP(type, 0, first, last);
2106}
2107
2108/* Constructors */
2109
2110OP *
864dbfa3 2111Perl_newNULLLIST(pTHX)
79072805 2112{
8990e307
LW		 2113 return newOP(OP_STUB, 0);
2114}
2115
2116OP *
864dbfa3 2117Perl_force_list(pTHX_ OP *o)
8990e307 2118{
11343788
MB		 2119 if (!o || o->op_type != OP_LIST)
2120 o = newLISTOP(OP_LIST, 0, o, Nullop);
2121 null(o);
2122 return o;
79072805
LW		 2123}
2124
2125OP *
864dbfa3 2126Perl_newLISTOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2127{
2128 LISTOP *listop;
2129
b7dc083c 2130 NewOp(1101, listop, 1, LISTOP);
79072805
LW		 2131
2132 listop->op_type = type;
22c35a8c 2133 listop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2134 listop->op_children = (first != 0) + (last != 0);
2135 listop->op_flags = flags;
79072805
LW		 2136
2137 if (!last && first)
2138 last = first;
2139 else if (!first && last)
2140 first = last;
8990e307
LW		 2141 else if (first)
2142 first->op_sibling = last;
79072805
LW		 2143 listop->op_first = first;
2144 listop->op_last = last;
8990e307
LW		 2145 if (type == OP_LIST) {
2146 OP* pushop;
2147 pushop = newOP(OP_PUSHMARK, 0);
2148 pushop->op_sibling = first;
2149 listop->op_first = pushop;
2150 listop->op_flags |= OPf_KIDS;
2151 if (!last)
2152 listop->op_last = pushop;
2153 }
2154 else if (listop->op_children)
2155 listop->op_flags |= OPf_KIDS;
79072805
LW		 2156
2157 return (OP*)listop;
2158}
2159
2160OP *
864dbfa3 2161Perl_newOP(pTHX_ I32 type, I32 flags)
79072805 2162{
11343788 2163 OP *o;
b7dc083c 2164 NewOp(1101, o, 1, OP);
11343788 2165 o->op_type = type;
22c35a8c 2166 o->op_ppaddr = PL_ppaddr[type];
11343788 2167 o->op_flags = flags;
79072805 2168
11343788
MB		 2169 o->op_next = o;
2170 o->op_private = 0 + (flags >> 8);
22c35a8c 2171 if (PL_opargs[type] & OA_RETSCALAR)
11343788 2172 scalar(o);
22c35a8c 2173 if (PL_opargs[type] & OA_TARGET)
11343788
MB		 2174 o->op_targ = pad_alloc(type, SVs_PADTMP);
2175 return CHECKOP(type, o);
79072805
LW		 2176}
2177
2178OP *
864dbfa3 2179Perl_newUNOP(pTHX_ I32 type, I32 flags, OP *first)
79072805
LW		 2180{
2181 UNOP *unop;
2182
93a17b20 2183 if (!first)
aeea060c 2184 first = newOP(OP_STUB, 0);
22c35a8c 2185 if (PL_opargs[type] & OA_MARK)
8990e307 2186 first = force_list(first);
93a17b20 2187
b7dc083c 2188 NewOp(1101, unop, 1, UNOP);
79072805 2189 unop->op_type = type;
22c35a8c 2190 unop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2191 unop->op_first = first;
2192 unop->op_flags = flags | OPf_KIDS;
c07a80fd 2193 unop->op_private = 1 | (flags >> 8);
e50aee73 2194 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 2195 if (unop->op_next)
2196 return (OP*)unop;
2197
a0d0e21e 2198 return fold_constants((OP *) unop);
79072805
LW		 2199}
2200
2201OP *
864dbfa3 2202Perl_newBINOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2203{
2204 BINOP *binop;
b7dc083c 2205 NewOp(1101, binop, 1, BINOP);
79072805
LW		 2206
2207 if (!first)
2208 first = newOP(OP_NULL, 0);
2209
2210 binop->op_type = type;
22c35a8c 2211 binop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2212 binop->op_first = first;
2213 binop->op_flags = flags | OPf_KIDS;
2214 if (!last) {
2215 last = first;
c07a80fd 2216 binop->op_private = 1 | (flags >> 8);
79072805
LW		 2217 }
2218 else {
c07a80fd 2219 binop->op_private = 2 | (flags >> 8);
79072805
LW		 2220 first->op_sibling = last;
2221 }
2222
e50aee73 2223 binop = (BINOP*)CHECKOP(type, binop);
b162f9ea 2224 if (binop->op_next || binop->op_type != type)
79072805
LW		 2225 return (OP*)binop;
2226
7284ab6f 2227 binop->op_last = binop->op_first->op_sibling;
79072805 2228
a0d0e21e 2229 return fold_constants((OP *)binop);
79072805
LW		 2230}
2231
a0ed51b3
LW		 2232static int
2233utf8compare(const void *a, const void *b)
2234{
2235 int i;
2236 for (i = 0; i < 10; i++) {
2237 if ((*(U8**)a)[i] < (*(U8**)b)[i])
2238 return -1;
2239 if ((*(U8**)a)[i] > (*(U8**)b)[i])
2240 return 1;
2241 }
2242 return 0;
2243}
2244
79072805 2245OP *
864dbfa3 2246Perl_pmtrans(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2247{
79072805
LW		 2248 SV *tstr = ((SVOP*)expr)->op_sv;
2249 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 2250 STRLEN tlen;
2251 STRLEN rlen;
ec49126f 2252 register U8 *t = (U8*)SvPV(tstr, tlen);
2253 register U8 *r = (U8*)SvPV(rstr, rlen);
79072805
LW		 2254 register I32 i;
2255 register I32 j;
a0ed51b3 2256 I32 del;
79072805 2257 I32 complement;
5d06d08e 2258 I32 squash;
79072805
LW		 2259 register short *tbl;
2260
11343788 2261 complement = o->op_private & OPpTRANS_COMPLEMENT;
a0ed51b3 2262 del = o->op_private & OPpTRANS_DELETE;
5d06d08e 2263 squash = o->op_private & OPpTRANS_SQUASH;
79072805 2264
a0ed51b3 2265 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
79cb57f6 2266 SV* listsv = newSVpvn("# comment\n",10);
a0ed51b3
LW		 2267 SV* transv = 0;
2268 U8* tend = t + tlen;
2269 U8* rend = r + rlen;
2270 I32 ulen;
2271 U32 tfirst = 1;
2272 U32 tlast = 0;
2273 I32 tdiff;
2274 U32 rfirst = 1;
2275 U32 rlast = 0;
2276 I32 rdiff;
2277 I32 diff;
2278 I32 none = 0;
2279 U32 max = 0;
2280 I32 bits;
2281 I32 grows = 0;
2282 I32 havefinal = 0;
2283 U32 final;
2284 HV *hv;
2285 I32 from_utf = o->op_private & OPpTRANS_FROM_UTF;
2286 I32 to_utf = o->op_private & OPpTRANS_TO_UTF;
2287
2288 if (complement) {
2289 U8 tmpbuf[10];
2290 U8** cp;
2291 UV nextmin = 0;
2292 New(1109, cp, tlen, U8*);
2293 i = 0;
79cb57f6 2294 transv = newSVpvn("",0);
a0ed51b3
LW		 2295 while (t < tend) {
2296 cp[i++] = t;
2297 t += UTF8SKIP(t);
2298 if (*t == 0xff) {
2299 t++;
2300 t += UTF8SKIP(t);
2301 }
2302 }
2303 qsort(cp, i, sizeof(U8*), utf8compare);
2304 for (j = 0; j < i; j++) {
2305 U8 *s = cp[j];
2306 UV val = utf8_to_uv(s, &ulen);
2307 s += ulen;
2308 diff = val - nextmin;
2309 if (diff > 0) {
2310 t = uv_to_utf8(tmpbuf,nextmin);
dfe13c55 2311 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2312 if (diff > 1) {
2313 t = uv_to_utf8(tmpbuf, val - 1);
2314 sv_catpvn(transv, "\377", 1);
dfe13c55 2315 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2316 }
2317 }
2318 if (*s == 0xff)
2319 val = utf8_to_uv(s+1, &ulen);
2320 if (val >= nextmin)
2321 nextmin = val + 1;
2322 }
2323 t = uv_to_utf8(tmpbuf,nextmin);
dfe13c55 2324 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2325 t = uv_to_utf8(tmpbuf, 0x7fffffff);
2326 sv_catpvn(transv, "\377", 1);
dfe13c55
GS		 2327 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
2328 t = (U8*)SvPVX(transv);
a0ed51b3
LW		 2329 tlen = SvCUR(transv);
2330 tend = t + tlen;
2331 }
2332 else if (!rlen && !del) {
2333 r = t; rlen = tlen; rend = tend;
4757a243
LW		 2334 }
2335 if (!squash) {
2336 if (to_utf && from_utf) { /* only counting characters */
2337 if (t == r || (tlen == rlen && memEQ(t, r, tlen)))
2338 o->op_private |= OPpTRANS_IDENTICAL;
2339 }
2340 else { /* straight latin-1 translation */
2341 if (tlen == 4 && memEQ(t, "\0\377\303\277", 4) &&
2342 rlen == 4 && memEQ(r, "\0\377\303\277", 4))
2343 o->op_private |= OPpTRANS_IDENTICAL;
2344 }
a0ed51b3
LW		 2345 }
2346
2347 while (t < tend || tfirst <= tlast) {
2348 /* see if we need more "t" chars */
2349 if (tfirst > tlast) {
2350 tfirst = (I32)utf8_to_uv(t, &ulen);
2351 t += ulen;
2352 if (t < tend && *t == 0xff) { /* illegal utf8 val indicates range */
2353 tlast = (I32)utf8_to_uv(++t, &ulen);
2354 t += ulen;
2355 }
2356 else
2357 tlast = tfirst;
2358 }
2359
2360 /* now see if we need more "r" chars */
2361 if (rfirst > rlast) {
2362 if (r < rend) {
2363 rfirst = (I32)utf8_to_uv(r, &ulen);
2364 r += ulen;
2365 if (r < rend && *r == 0xff) { /* illegal utf8 val indicates range */
2366 rlast = (I32)utf8_to_uv(++r, &ulen);
2367 r += ulen;
2368 }
2369 else
2370 rlast = rfirst;
2371 }
2372 else {
2373 if (!havefinal++)
2374 final = rlast;
2375 rfirst = rlast = 0xffffffff;
2376 }
2377 }
2378
2379 /* now see which range will peter our first, if either. */
2380 tdiff = tlast - tfirst;
2381 rdiff = rlast - rfirst;
2382
2383 if (tdiff <= rdiff)
2384 diff = tdiff;
2385 else
2386 diff = rdiff;
2387
2388 if (rfirst == 0xffffffff) {
2389 diff = tdiff; /* oops, pretend rdiff is infinite */
2390 if (diff > 0)
cea2e8a9 2391 Perl_sv_catpvf(aTHX_ listsv, "%04x\t%04x\tXXXX\n", tfirst, tlast);
a0ed51b3 2392 else
cea2e8a9 2393 Perl_sv_catpvf(aTHX_ listsv, "%04x\t\tXXXX\n", tfirst);
a0ed51b3
LW		 2394 }
2395 else {
2396 if (diff > 0)
cea2e8a9 2397 Perl_sv_catpvf(aTHX_ listsv, "%04x\t%04x\t%04x\n", tfirst, tfirst + diff, rfirst);
a0ed51b3 2398 else
cea2e8a9 2399 Perl_sv_catpvf(aTHX_ listsv, "%04x\t\t%04x\n", tfirst, rfirst);
a0ed51b3
LW		 2400
2401 if (rfirst + diff > max)
2402 max = rfirst + diff;
2403 rfirst += diff + 1;
2404 if (!grows) {
2405 if (rfirst <= 0x80)
2406 ;
2407 else if (rfirst <= 0x800)
2408 grows |= (tfirst < 0x80);
2409 else if (rfirst <= 0x10000)
2410 grows |= (tfirst < 0x800);
2411 else if (rfirst <= 0x200000)
2412 grows |= (tfirst < 0x10000);
2413 else if (rfirst <= 0x4000000)
2414 grows |= (tfirst < 0x200000);
2415 else if (rfirst <= 0x80000000)
2416 grows |= (tfirst < 0x4000000);
2417 }
2418 }
2419 tfirst += diff + 1;
2420 }
2421
2422 none = ++max;
2423 if (del)
2424 del = ++max;
2425
2426 if (max > 0xffff)
2427 bits = 32;
2428 else if (max > 0xff)
2429 bits = 16;
2430 else
2431 bits = 8;
2432
2433 cSVOPo->op_sv = (SV*)swash_init("utf8", "", listsv, bits, none);
2434 SvREFCNT_dec(listsv);
2435 if (transv)
2436 SvREFCNT_dec(transv);
2437
2438 if (!del && havefinal)
2439 (void)hv_store((HV*)SvRV((cSVOPo->op_sv)), "FINAL", 5, newSViv((IV)final), 0);
2440
2441 if (grows && to_utf)
2442 o->op_private |= OPpTRANS_GROWS;
2443
2444 op_free(expr);
2445 op_free(repl);
2446 return o;
2447 }
2448
2449 tbl = (short*)cPVOPo->op_pv;
79072805
LW		 2450 if (complement) {
2451 Zero(tbl, 256, short);
2452 for (i = 0; i < tlen; i++)
ec49126f 2453 tbl[t[i]] = -1;
79072805
LW		 2454 for (i = 0, j = 0; i < 256; i++) {
2455 if (!tbl[i]) {
2456 if (j >= rlen) {
a0ed51b3 2457 if (del)
79072805
LW		 2458 tbl[i] = -2;
2459 else if (rlen)
ec49126f 2460 tbl[i] = r[j-1];
79072805
LW		 2461 else
2462 tbl[i] = i;
2463 }
2464 else
ec49126f 2465 tbl[i] = r[j++];
79072805
LW		 2466 }
2467 }
2468 }
2469 else {
a0ed51b3 2470 if (!rlen && !del) {
79072805 2471 r = t; rlen = tlen;
5d06d08e 2472 if (!squash)
4757a243 2473 o->op_private |= OPpTRANS_IDENTICAL;
79072805
LW		 2474 }
2475 for (i = 0; i < 256; i++)
2476 tbl[i] = -1;
2477 for (i = 0, j = 0; i < tlen; i++,j++) {
2478 if (j >= rlen) {
a0ed51b3 2479 if (del) {
ec49126f 2480 if (tbl[t[i]] == -1)
2481 tbl[t[i]] = -2;
79072805
LW		 2482 continue;
2483 }
2484 --j;
2485 }
ec49126f 2486 if (tbl[t[i]] == -1)
2487 tbl[t[i]] = r[j];
79072805
LW		 2488 }
2489 }
2490 op_free(expr);
2491 op_free(repl);
2492
11343788 2493 return o;
79072805
LW		 2494}
2495
2496OP *
864dbfa3 2497Perl_newPMOP(pTHX_ I32 type, I32 flags)
79072805 2498{
11343788 2499 dTHR;
79072805
LW		 2500 PMOP *pmop;
2501
b7dc083c 2502 NewOp(1101, pmop, 1, PMOP);
79072805 2503 pmop->op_type = type;
22c35a8c 2504 pmop->op_ppaddr = PL_ppaddr[type];
79072805 2505 pmop->op_flags = flags;
c07a80fd 2506 pmop->op_private = 0 | (flags >> 8);
79072805 2507
3280af22 2508 if (PL_hints & HINT_RE_TAINT)
b3eb6a9b 2509 pmop->op_pmpermflags |= PMf_RETAINT;
3280af22 2510 if (PL_hints & HINT_LOCALE)
b3eb6a9b
GS		 2511 pmop->op_pmpermflags |= PMf_LOCALE;
2512 pmop->op_pmflags = pmop->op_pmpermflags;
36477c24 2513
79072805 2514 /* link into pm list */
3280af22
NIS		 2515 if (type != OP_TRANS && PL_curstash) {
2516 pmop->op_pmnext = HvPMROOT(PL_curstash);
2517 HvPMROOT(PL_curstash) = pmop;
79072805
LW		 2518 }
2519
2520 return (OP*)pmop;
2521}
2522
2523OP *
864dbfa3 2524Perl_pmruntime(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2525{
5c0ca799 2526 dTHR;
79072805
LW		 2527 PMOP *pm;
2528 LOGOP *rcop;
ce862d02 2529 I32 repl_has_vars = 0;
79072805 2530
11343788
MB		 2531 if (o->op_type == OP_TRANS)
2532 return pmtrans(o, expr, repl);
79072805 2533
3280af22 2534 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2535 pm = (PMOP*)o;
79072805
LW		 2536
2537 if (expr->op_type == OP_CONST) {
463ee0b2 2538 STRLEN plen;
79072805 2539 SV *pat = ((SVOP*)expr)->op_sv;
463ee0b2 2540 char *p = SvPV(pat, plen);
11343788 2541 if ((o->op_flags & OPf_SPECIAL) && strEQ(p, " ")) {
93a17b20 2542 sv_setpvn(pat, "\\s+", 3);
463ee0b2 2543 p = SvPV(pat, plen);
79072805
LW		 2544 pm->op_pmflags |= PMf_SKIPWHITE;
2545 }
cea2e8a9 2546 pm->op_pmregexp = CALLREGCOMP(aTHX_ p, p + plen, pm);
aeea060c 2547 if (strEQ("\\s+", pm->op_pmregexp->precomp))
85e6fe83 2548 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2549 op_free(expr);
2550 }
2551 else {
3280af22
NIS		 2552 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL))
2553 expr = newUNOP((!(PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2554 ? OP_REGCRESET
2555 : OP_REGCMAYBE),0,expr);
463ee0b2 2556
b7dc083c 2557 NewOp(1101, rcop, 1, LOGOP);
79072805 2558 rcop->op_type = OP_REGCOMP;
22c35a8c 2559 rcop->op_ppaddr = PL_ppaddr[OP_REGCOMP];
79072805 2560 rcop->op_first = scalar(expr);
3280af22 2561 rcop->op_flags |= ((PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2562 ? (OPf_SPECIAL | OPf_KIDS)
2563 : OPf_KIDS);
79072805 2564 rcop->op_private = 1;
11343788 2565 rcop->op_other = o;
79072805
LW		 2566
2567 /* establish postfix order */
3280af22 2568 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL)) {
463ee0b2
LW		 2569 LINKLIST(expr);
2570 rcop->op_next = expr;
2571 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2572 }
2573 else {
2574 rcop->op_next = LINKLIST(expr);
2575 expr->op_next = (OP*)rcop;
2576 }
79072805 2577
11343788 2578 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2579 }
2580
2581 if (repl) {
748a9306 2582 OP *curop;
0244c3a4 2583 if (pm->op_pmflags & PMf_EVAL) {
748a9306 2584 curop = 0;
0244c3a4
GS		 2585 if (PL_curcop->cop_line < PL_multi_end)
2586 PL_curcop->cop_line = PL_multi_end;
2587 }
554b3eca 2588#ifdef USE_THREADS
2faa37cc 2589 else if (repl->op_type == OP_THREADSV
554b3eca 2590 && strchr("&`'123456789+",
533c011a 2591 PL_threadsv_names[repl->op_targ]))
554b3eca
MB		 2592 {
2593 curop = 0;
2594 }
2595#endif /* USE_THREADS */
748a9306
LW		 2596 else if (repl->op_type == OP_CONST)
2597 curop = repl;
79072805 2598 else {
79072805
LW		 2599 OP *lastop = 0;
2600 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
22c35a8c 2601 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
554b3eca 2602#ifdef USE_THREADS
ce862d02
IZ		 2603 if (curop->op_type == OP_THREADSV) {
2604 repl_has_vars = 1;
be949f6f 2605 if (strchr("&`'123456789+", curop->op_private))
ce862d02 2606 break;
554b3eca
MB		 2607 }
2608#else
79072805
LW		 2609 if (curop->op_type == OP_GV) {
2610 GV *gv = ((GVOP*)curop)->op_gv;
ce862d02 2611 repl_has_vars = 1;
93a17b20 2612 if (strchr("&`'123456789+", *GvENAME(gv)))
79072805
LW		 2613 break;
2614 }
554b3eca 2615#endif /* USE_THREADS */
79072805
LW		 2616 else if (curop->op_type == OP_RV2CV)
2617 break;
2618 else if (curop->op_type == OP_RV2SV ||
2619 curop->op_type == OP_RV2AV ||
2620 curop->op_type == OP_RV2HV ||
2621 curop->op_type == OP_RV2GV) {
2622 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2623 break;
2624 }
748a9306
LW		 2625 else if (curop->op_type == OP_PADSV ||
2626 curop->op_type == OP_PADAV ||
2627 curop->op_type == OP_PADHV ||
554b3eca 2628 curop->op_type == OP_PADANY) {
ce862d02 2629 repl_has_vars = 1;
748a9306 2630 }
1167e5da
SM		 2631 else if (curop->op_type == OP_PUSHRE)
2632 ; /* Okay here, dangerous in newASSIGNOP */
79072805
LW		 2633 else
2634 break;
2635 }
2636 lastop = curop;
2637 }
748a9306 2638 }
ce862d02
IZ		 2639 if (curop == repl
2640 && !(repl_has_vars
2641 && (!pm->op_pmregexp
2642 || pm->op_pmregexp->reganch & ROPT_EVAL_SEEN))) {
748a9306 2643 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2644 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2645 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2646 }
2647 else {
ce862d02
IZ		 2648 if (curop == repl && !pm->op_pmregexp) { /* Has variables. */
2649 pm->op_pmflags |= PMf_MAYBE_CONST;
2650 pm->op_pmpermflags |= PMf_MAYBE_CONST;
2651 }
b7dc083c 2652 NewOp(1101, rcop, 1, LOGOP);
748a9306 2653 rcop->op_type = OP_SUBSTCONT;
22c35a8c 2654 rcop->op_ppaddr = PL_ppaddr[OP_SUBSTCONT];
748a9306
LW		 2655 rcop->op_first = scalar(repl);
2656 rcop->op_flags |= OPf_KIDS;
2657 rcop->op_private = 1;
11343788 2658 rcop->op_other = o;
748a9306
LW		 2659
2660 /* establish postfix order */
2661 rcop->op_next = LINKLIST(repl);
2662 repl->op_next = (OP*)rcop;
2663
2664 pm->op_pmreplroot = scalar((OP*)rcop);
2665 pm->op_pmreplstart = LINKLIST(rcop);
2666 rcop->op_next = 0;
79072805
LW		 2667 }
2668 }
2669
2670 return (OP*)pm;
2671}
2672
2673OP *
864dbfa3 2674Perl_newSVOP(pTHX_ I32 type, I32 flags, SV *sv)
79072805
LW		 2675{
2676 SVOP *svop;
b7dc083c 2677 NewOp(1101, svop, 1, SVOP);
79072805 2678 svop->op_type = type;
22c35a8c 2679 svop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2680 svop->op_sv = sv;
2681 svop->op_next = (OP*)svop;
2682 svop->op_flags = flags;
22c35a8c 2683 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2684 scalar((OP*)svop);
22c35a8c 2685 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2686 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2687 return CHECKOP(type, svop);
79072805
LW		 2688}
2689
2690OP *
864dbfa3 2691Perl_newGVOP(pTHX_ I32 type, I32 flags, GV *gv)
79072805 2692{
11343788 2693 dTHR;
79072805 2694 GVOP *gvop;
b7dc083c 2695 NewOp(1101, gvop, 1, GVOP);
79072805 2696 gvop->op_type = type;
22c35a8c 2697 gvop->op_ppaddr = PL_ppaddr[type];
8990e307 2698 gvop->op_gv = (GV*)SvREFCNT_inc(gv);
79072805
LW		 2699 gvop->op_next = (OP*)gvop;
2700 gvop->op_flags = flags;
22c35a8c 2701 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2702 scalar((OP*)gvop);
22c35a8c 2703 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2704 gvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2705 return CHECKOP(type, gvop);
79072805
LW		 2706}
2707
2708OP *
864dbfa3 2709Perl_newPVOP(pTHX_ I32 type, I32 flags, char *pv)
79072805
LW		 2710{
2711 PVOP *pvop;
b7dc083c 2712 NewOp(1101, pvop, 1, PVOP);
79072805 2713 pvop->op_type = type;
22c35a8c 2714 pvop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2715 pvop->op_pv = pv;
2716 pvop->op_next = (OP*)pvop;
2717 pvop->op_flags = flags;
22c35a8c 2718 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2719 scalar((OP*)pvop);
22c35a8c 2720 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2721 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2722 return CHECKOP(type, pvop);
79072805
LW		 2723}
2724
79072805 2725void
864dbfa3 2726Perl_package(pTHX_ OP *o)
79072805 2727{
11343788 2728 dTHR;
93a17b20 2729 SV *sv;
79072805 2730
3280af22
NIS		 2731 save_hptr(&PL_curstash);
2732 save_item(PL_curstname);
11343788 2733 if (o) {
463ee0b2
LW		 2734 STRLEN len;
2735 char *name;
11343788 2736 sv = cSVOPo->op_sv;
463ee0b2 2737 name = SvPV(sv, len);
3280af22
NIS		 2738 PL_curstash = gv_stashpvn(name,len,TRUE);
2739 sv_setpvn(PL_curstname, name, len);
11343788 2740 op_free(o);
93a17b20
LW		 2741 }
2742 else {
3280af22
NIS		 2743 sv_setpv(PL_curstname,"<none>");
2744 PL_curstash = Nullhv;
93a17b20 2745 }
7ad382f4 2746 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 2747 PL_copline = NOLINE;
2748 PL_expect = XSTATE;
79072805
LW		 2749}
2750
85e6fe83 2751void
864dbfa3 2752Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *id, OP *arg)
85e6fe83 2753{
a0d0e21e
LW		 2754 OP *pack;
2755 OP *meth;
2756 OP *rqop;
2757 OP *imop;
b1cb66bf 2758 OP *veop;
78ca652e 2759 GV *gv;
85e6fe83 2760
a0d0e21e 2761 if (id->op_type != OP_CONST)
cea2e8a9 2762 Perl_croak(aTHX_ "Module name must be constant");
85e6fe83 2763
b1cb66bf 2764 veop = Nullop;
2765
2766 if(version != Nullop) {
2767 SV *vesv = ((SVOP*)version)->op_sv;
2768
2769 if (arg == Nullop && !SvNIOK(vesv)) {
2770 arg = version;
2771 }
2772 else {
2773 OP *pack;
2774 OP *meth;
2775
2776 if (version->op_type != OP_CONST || !SvNIOK(vesv))
cea2e8a9 2777 Perl_croak(aTHX_ "Version number must be constant number");
b1cb66bf 2778
2779 /* Make copy of id so we don't free it twice */
2780 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
2781
2782 /* Fake up a method call to VERSION */
79cb57f6 2783 meth = newSVOP(OP_CONST, 0, newSVpvn("VERSION", 7));
b1cb66bf 2784 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
2785 append_elem(OP_LIST,
2786 prepend_elem(OP_LIST, pack, list(version)),
2787 newUNOP(OP_METHOD, 0, meth)));
2788 }
2789 }
aeea060c 2790
a0d0e21e 2791 /* Fake up an import/unimport */
4633a7c4
LW		 2792 if (arg && arg->op_type == OP_STUB)
2793 imop = arg; /* no import on explicit () */
b1cb66bf 2794 else if(SvNIOK(((SVOP*)id)->op_sv)) {
2795 imop = Nullop; /* use 5.0; */
2796 }
4633a7c4
LW		 2797 else {
2798 /* Make copy of id so we don't free it twice */
2799 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
4633a7c4
LW		 2800 meth = newSVOP(OP_CONST, 0,
2801 aver
79cb57f6
GS		 2802 ? newSVpvn("import", 6)
2803 : newSVpvn("unimport", 8)
4633a7c4
LW		 2804 );
2805 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
a0d0e21e
LW		 2806 append_elem(OP_LIST,
2807 prepend_elem(OP_LIST, pack, list(arg)),
2808 newUNOP(OP_METHOD, 0, meth)));
4633a7c4
LW		 2809 }
2810
78ca652e
GS		 2811 /* Fake up a require, handle override, if any */
2812 gv = gv_fetchpv("require", FALSE, SVt_PVCV);
2813 if (!(gv && GvIMPORTED_CV(gv)))
2814 gv = gv_fetchpv("CORE::GLOBAL::require", FALSE, SVt_PVCV);
2815
2816 if (gv && GvIMPORTED_CV(gv)) {
2817 rqop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
2818 append_elem(OP_LIST, id,
2819 scalar(newUNOP(OP_RV2CV, 0,
2820 newGVOP(OP_GV, 0,
2821 gv))))));
2822 }
2823 else {
2824 rqop = newUNOP(OP_REQUIRE, 0, id);
2825 }
a0d0e21e
LW		 2826
2827 /* Fake up the BEGIN {}, which does its thing immediately. */
c07a80fd 2828 newSUB(floor,
79cb57f6 2829 newSVOP(OP_CONST, 0, newSVpvn("BEGIN", 5)),
4633a7c4 2830 Nullop,
a0d0e21e 2831 append_elem(OP_LINESEQ,
b1cb66bf 2832 append_elem(OP_LINESEQ,
2833 newSTATEOP(0, Nullch, rqop),
2834 newSTATEOP(0, Nullch, veop)),
a0d0e21e 2835 newSTATEOP(0, Nullch, imop) ));
85e6fe83 2836
3280af22
NIS		 2837 PL_copline = NOLINE;
2838 PL_expect = XSTATE;
85e6fe83
LW		 2839}
2840
79072805 2841OP *
864dbfa3 2842Perl_dofile(pTHX_ OP *term)
78ca652e
GS		 2843{
2844 OP *doop;
2845 GV *gv;
2846
2847 gv = gv_fetchpv("do", FALSE, SVt_PVCV);
2848 if (!(gv && GvIMPORTED_CV(gv)))
2849 gv = gv_fetchpv("CORE::GLOBAL::do", FALSE, SVt_PVCV);
2850
2851 if (gv && GvIMPORTED_CV(gv)) {
2852 doop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
2853 append_elem(OP_LIST, term,
2854 scalar(newUNOP(OP_RV2CV, 0,
2855 newGVOP(OP_GV, 0,
2856 gv))))));
2857 }
2858 else {
2859 doop = newUNOP(OP_DOFILE, 0, scalar(term));
2860 }
2861 return doop;
2862}
2863
2864OP *
864dbfa3 2865Perl_newSLICEOP(pTHX_ I32 flags, OP *subscript, OP *listval)
79072805
LW		 2866{
2867 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 2868 list(force_list(subscript)),
2869 list(force_list(listval)) );
79072805
LW		 2870}
2871
76e3520e 2872STATIC I32
cea2e8a9 2873S_list_assignment(pTHX_ register OP *o)
79072805 2874{
11343788 2875 if (!o)
79072805
LW		 2876 return TRUE;
2877
11343788
MB		 2878 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
2879 o = cUNOPo->op_first;
79072805 2880
11343788 2881 if (o->op_type == OP_COND_EXPR) {
1a67a97c
SM		 2882 I32 t = list_assignment(cLOGOPo->op_first->op_sibling);
2883 I32 f = list_assignment(cLOGOPo->op_first->op_sibling->op_sibling);
79072805
LW		 2884
2885 if (t && f)
2886 return TRUE;
2887 if (t || f)
2888 yyerror("Assignment to both a list and a scalar");
2889 return FALSE;
2890 }
2891
11343788
MB		 2892 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
2893 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
2894 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 2895 return TRUE;
2896
11343788 2897 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 2898 return TRUE;
2899
11343788 2900 if (o->op_type == OP_RV2SV)
79072805
LW		 2901 return FALSE;
2902
2903 return FALSE;
2904}
2905
2906OP *
864dbfa3 2907Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
79072805 2908{
11343788 2909 OP *o;
79072805 2910
a0d0e21e
LW		 2911 if (optype) {
2912 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN) {
2913 return newLOGOP(optype, 0,
2914 mod(scalar(left), optype),
2915 newUNOP(OP_SASSIGN, 0, scalar(right)));
2916 }
2917 else {
2918 return newBINOP(optype, OPf_STACKED,
2919 mod(scalar(left), optype), scalar(right));
2920 }
2921 }
2922
79072805 2923 if (list_assignment(left)) {
6ee623d5 2924 dTHR;
3280af22
NIS		 2925 PL_modcount = 0;
2926 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 2927 left = mod(left, OP_AASSIGN);
3280af22
NIS		 2928 if (PL_eval_start)
2929 PL_eval_start = 0;
748a9306 2930 else {
a0d0e21e
LW		 2931 op_free(left);
2932 op_free(right);
2933 return Nullop;
2934 }
11343788 2935 o = newBINOP(OP_AASSIGN, flags,
8990e307
LW		 2936 list(force_list(right)),
2937 list(force_list(left)) );
11343788 2938 o->op_private = 0 | (flags >> 8);
a0d0e21e 2939 if (!(left->op_private & OPpLVAL_INTRO)) {
79072805 2940 OP *curop;
11343788 2941 OP *lastop = o;
3280af22 2942 PL_generation++;
11343788 2943 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
22c35a8c 2944 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805
LW		 2945 if (curop->op_type == OP_GV) {
2946 GV *gv = ((GVOP*)curop)->op_gv;
3280af22 2947 if (gv == PL_defgv || SvCUR(gv) == PL_generation)
79072805 2948 break;
3280af22 2949 SvCUR(gv) = PL_generation;
79072805 2950 }
748a9306
LW		 2951 else if (curop->op_type == OP_PADSV ||
2952 curop->op_type == OP_PADAV ||
2953 curop->op_type == OP_PADHV ||
2954 curop->op_type == OP_PADANY) {
3280af22 2955 SV **svp = AvARRAY(PL_comppad_name);
8e07c86e 2956 SV *sv = svp[curop->op_targ];
3280af22 2957 if (SvCUR(sv) == PL_generation)
748a9306 2958 break;
3280af22 2959 SvCUR(sv) = PL_generation; /* (SvCUR not used any more) */
748a9306 2960 }
79072805
LW		 2961 else if (curop->op_type == OP_RV2CV)
2962 break;
2963 else if (curop->op_type == OP_RV2SV ||
2964 curop->op_type == OP_RV2AV ||
2965 curop->op_type == OP_RV2HV ||
2966 curop->op_type == OP_RV2GV) {
2967 if (lastop->op_type != OP_GV) /* funny deref? */
2968 break;
2969 }
1167e5da
SM		 2970 else if (curop->op_type == OP_PUSHRE) {
2971 if (((PMOP*)curop)->op_pmreplroot) {
2972 GV *gv = (GV*)((PMOP*)curop)->op_pmreplroot;
3280af22 2973 if (gv == PL_defgv || SvCUR(gv) == PL_generation)
1167e5da 2974 break;
3280af22 2975 SvCUR(gv) = PL_generation;
1167e5da
SM		 2976 }
2977 }
79072805
LW		 2978 else
2979 break;
2980 }
2981 lastop = curop;
2982 }
11343788
MB		 2983 if (curop != o)
2984 o->op_private = OPpASSIGN_COMMON;
79072805 2985 }
c07a80fd 2986 if (right && right->op_type == OP_SPLIT) {
2987 OP* tmpop;
2988 if ((tmpop = ((LISTOP*)right)->op_first) &&
2989 tmpop->op_type == OP_PUSHRE)
2990 {
2991 PMOP *pm = (PMOP*)tmpop;
2992 if (left->op_type == OP_RV2AV &&
2993 !(left->op_private & OPpLVAL_INTRO) &&
11343788 2994 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 2995 {
2996 tmpop = ((UNOP*)left)->op_first;
2997 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
2998 pm->op_pmreplroot = (OP*)((GVOP*)tmpop)->op_gv;
2999 pm->op_pmflags |= PMf_ONCE;
11343788 3000 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 3001 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
3002 tmpop->op_sibling = Nullop; /* don't free split */
3003 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 3004 op_free(o); /* blow off assign */
54310121 3005 right->op_flags &= ~OPf_WANT;
a5f75d66 3006 /* "I don't know and I don't care." */
c07a80fd 3007 return right;
3008 }
3009 }
3010 else {
3280af22 3011 if (PL_modcount < 10000 &&
c07a80fd 3012 ((LISTOP*)right)->op_last->op_type == OP_CONST)
3013 {
3014 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
3015 if (SvIVX(sv) == 0)
3280af22 3016 sv_setiv(sv, PL_modcount+1);
c07a80fd 3017 }
3018 }
3019 }
3020 }
11343788 3021 return o;
79072805
LW		 3022 }
3023 if (!right)
3024 right = newOP(OP_UNDEF, 0);
3025 if (right->op_type == OP_READLINE) {
3026 right->op_flags |= OPf_STACKED;
463ee0b2 3027 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 3028 }
a0d0e21e 3029 else {
3280af22 3030 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 3031 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 3032 scalar(right), mod(scalar(left), OP_SASSIGN) );
3280af22
NIS		 3033 if (PL_eval_start)
3034 PL_eval_start = 0;
748a9306 3035 else {
11343788 3036 op_free(o);
a0d0e21e
LW		 3037 return Nullop;
3038 }
3039 }
11343788 3040 return o;
79072805
LW		 3041}
3042
3043OP *
864dbfa3 3044Perl_newSTATEOP(pTHX_ I32 flags, char *label, OP *o)
79072805 3045{
11343788 3046 dTHR;
bbce6d69 3047 U32 seq = intro_my();
79072805
LW		 3048 register COP *cop;
3049
b7dc083c 3050 NewOp(1101, cop, 1, COP);
3280af22 3051 if (PERLDB_LINE && PL_curcop->cop_line && PL_curstash != PL_debstash) {
8990e307 3052 cop->op_type = OP_DBSTATE;
22c35a8c 3053 cop->op_ppaddr = PL_ppaddr[ OP_DBSTATE ];
8990e307
LW		 3054 }
3055 else {
3056 cop->op_type = OP_NEXTSTATE;
22c35a8c 3057 cop->op_ppaddr = PL_ppaddr[ OP_NEXTSTATE ];
8990e307 3058 }
79072805 3059 cop->op_flags = flags;
a0ed51b3 3060 cop->op_private = (PL_hints & HINT_UTF8);
ff0cee69 3061#ifdef NATIVE_HINTS
3062 cop->op_private |= NATIVE_HINTS;
3063#endif
e24b16f9 3064 PL_compiling.op_private = cop->op_private;
79072805
LW		 3065 cop->op_next = (OP*)cop;
3066
463ee0b2
LW		 3067 if (label) {
3068 cop->cop_label = label;
3280af22 3069 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 3070 }
bbce6d69 3071 cop->cop_seq = seq;
3280af22 3072 cop->cop_arybase = PL_curcop->cop_arybase;
0453d815 3073 if (specialWARN(PL_curcop->cop_warnings))
599cee73
PM		 3074 cop->cop_warnings = PL_curcop->cop_warnings ;
3075 else
3076 cop->cop_warnings = newSVsv(PL_curcop->cop_warnings) ;
3077
79072805 3078
3280af22
NIS		 3079 if (PL_copline == NOLINE)
3080 cop->cop_line = PL_curcop->cop_line;
79072805 3081 else {
3280af22
NIS		 3082 cop->cop_line = PL_copline;
3083 PL_copline = NOLINE;
79072805 3084 }
3280af22
NIS		 3085 cop->cop_filegv = (GV*)SvREFCNT_inc(PL_curcop->cop_filegv);
3086 cop->cop_stash = PL_curstash;
79072805 3087
3280af22
NIS		 3088 if (PERLDB_LINE && PL_curstash != PL_debstash) {
3089 SV **svp = av_fetch(GvAV(PL_curcop->cop_filegv),(I32)cop->cop_line, FALSE);
3090 if (svp && *svp != &PL_sv_undef && !SvIOK(*svp)) {
a0d0e21e 3091 (void)SvIOK_on(*svp);
a5f75d66 3092 SvIVX(*svp) = 1;
93a17b20
LW		 3093 SvSTASH(*svp) = (HV*)cop;
3094 }
3095 }
3096
11343788 3097 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 3098}
3099
bbce6d69 3100/* "Introduce" my variables to visible status. */
3101U32
864dbfa3 3102Perl_intro_my(pTHX)
bbce6d69 3103{
3104 SV **svp;
3105 SV *sv;
3106 I32 i;
3107
3280af22
NIS		 3108 if (! PL_min_intro_pending)
3109 return PL_cop_seqmax;
bbce6d69 3110
3280af22
NIS		 3111 svp = AvARRAY(PL_comppad_name);
3112 for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) {
3113 if ((sv = svp[i]) && sv != &PL_sv_undef && !SvIVX(sv)) {
c53d7c7d 3114 SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */
65202027 3115 SvNVX(sv) = (NV)PL_cop_seqmax;
bbce6d69 3116 }
3117 }
3280af22
NIS		 3118 PL_min_intro_pending = 0;
3119 PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */
3120 return PL_cop_seqmax++;
bbce6d69 3121}
3122
79072805 3123OP *
864dbfa3 3124Perl_newLOGOP(pTHX_ I32 type, I32 flags, OP *first, OP *other)
79072805 3125{
883ffac3
CS		 3126 return new_logop(type, flags, &first, &other);
3127}
3128
3bd495df 3129STATIC OP *
cea2e8a9 3130S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
883ffac3 3131{
11343788 3132 dTHR;
79072805 3133 LOGOP *logop;
11343788 3134 OP *o;
883ffac3
CS		 3135 OP *first = *firstp;
3136 OP *other = *otherp;
79072805 3137
a0d0e21e
LW		 3138 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
3139 return newBINOP(type, flags, scalar(first), scalar(other));
3140
8990e307 3141 scalarboolean(first);
79072805
LW		 3142 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
3143 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
3144 if (type == OP_AND || type == OP_OR) {
3145 if (type == OP_AND)
3146 type = OP_OR;
3147 else
3148 type = OP_AND;
11343788 3149 o = first;
883ffac3 3150 first = *firstp = cUNOPo->op_first;
11343788
MB		 3151 if (o->op_next)
3152 first->op_next = o->op_next;
3153 cUNOPo->op_first = Nullop;
3154 op_free(o);
79072805
LW		 3155 }
3156 }
3157 if (first->op_type == OP_CONST) {
599cee73 3158 if (ckWARN(WARN_PRECEDENCE) && (first->op_private & OPpCONST_BARE))
cea2e8a9 3159 Perl_warner(aTHX_ WARN_PRECEDENCE, "Probable precedence problem on %s",
22c35a8c 3160 PL_op_desc[type]);
79072805
LW		 3161 if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
3162 op_free(first);
883ffac3 3163 *firstp = Nullop;
79072805
LW		 3164 return other;
3165 }
3166 else {
3167 op_free(other);
883ffac3 3168 *otherp = Nullop;
79072805
LW		 3169 return first;
3170 }
3171 }
3172 else if (first->op_type == OP_WANTARRAY) {
3173 if (type == OP_AND)
3174 list(other);
3175 else
3176 scalar(other);
3177 }
599cee73 3178 else if (ckWARN(WARN_UNSAFE) && (first->op_flags & OPf_KIDS)) {
a6006777 3179 OP *k1 = ((UNOP*)first)->op_first;
3180 OP *k2 = k1->op_sibling;
3181 OPCODE warnop = 0;
3182 switch (first->op_type)
3183 {
3184 case OP_NULL:
3185 if (k2 && k2->op_type == OP_READLINE
3186 && (k2->op_flags & OPf_STACKED)
55d729e4 3187 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
a6006777 3188 warnop = k2->op_type;
3189 break;
3190
3191 case OP_SASSIGN:
68dc0745 3192 if (k1->op_type == OP_READDIR
3193 || k1->op_type == OP_GLOB
3194 || k1->op_type == OP_EACH)
a6006777 3195 warnop = k1->op_type;
3196 break;
3197 }
8ebc5c01 3198 if (warnop) {
3280af22
NIS		 3199 line_t oldline = PL_curcop->cop_line;
3200 PL_curcop->cop_line = PL_copline;
cea2e8a9 3201 Perl_warner(aTHX_ WARN_UNSAFE,
599cee73 3202 "Value of %s%s can be \"0\"; test with defined()",
22c35a8c 3203 PL_op_desc[warnop],
68dc0745 3204 ((warnop == OP_READLINE || warnop == OP_GLOB)
3205 ? " construct" : "() operator"));
3280af22 3206 PL_curcop->cop_line = oldline;
8ebc5c01 3207 }
a6006777 3208 }
79072805
LW		 3209
3210 if (!other)
3211 return first;
3212
a0d0e21e
LW		 3213 if (type == OP_ANDASSIGN || type == OP_ORASSIGN)
3214 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
3215
b7dc083c 3216 NewOp(1101, logop, 1, LOGOP);
79072805
LW		 3217
3218 logop->op_type = type;
22c35a8c 3219 logop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3220 logop->op_first = first;
3221 logop->op_flags = flags | OPf_KIDS;
3222 logop->op_other = LINKLIST(other);
c07a80fd 3223 logop->op_private = 1 | (flags >> 8);
79072805
LW		 3224
3225 /* establish postfix order */
3226 logop->op_next = LINKLIST(first);
3227 first->op_next = (OP*)logop;
3228 first->op_sibling = other;
3229
11343788
MB		 3230 o = newUNOP(OP_NULL, 0, (OP*)logop);
3231 other->op_next = o;
79072805 3232
11343788 3233 return o;
79072805
LW		 3234}
3235
3236OP *
864dbfa3 3237Perl_newCONDOP(pTHX_ I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 3238{
11343788 3239 dTHR;
1a67a97c
SM		 3240 LOGOP *logop;
3241 OP *start;
11343788 3242 OP *o;
79072805 3243
b1cb66bf 3244 if (!falseop)
3245 return newLOGOP(OP_AND, 0, first, trueop);
3246 if (!trueop)
3247 return newLOGOP(OP_OR, 0, first, falseop);
79072805 3248
8990e307 3249 scalarboolean(first);
79072805
LW		 3250 if (first->op_type == OP_CONST) {
3251 if (SvTRUE(((SVOP*)first)->op_sv)) {
3252 op_free(first);
b1cb66bf 3253 op_free(falseop);
3254 return trueop;
79072805
LW		 3255 }
3256 else {
3257 op_free(first);
b1cb66bf 3258 op_free(trueop);
3259 return falseop;
79072805
LW		 3260 }
3261 }
3262 else if (first->op_type == OP_WANTARRAY) {
b1cb66bf 3263 list(trueop);
3264 scalar(falseop);
79072805 3265 }
1a67a97c
SM		 3266 NewOp(1101, logop, 1, LOGOP);
3267 logop->op_type = OP_COND_EXPR;
3268 logop->op_ppaddr = PL_ppaddr[OP_COND_EXPR];
3269 logop->op_first = first;
3270 logop->op_flags = flags | OPf_KIDS;
3271 logop->op_private = 1 | (flags >> 8);
3272 logop->op_other = LINKLIST(trueop);
3273 logop->op_next = LINKLIST(falseop);
79072805 3274
79072805
LW		 3275
3276 /* establish postfix order */
1a67a97c
SM		 3277 start = LINKLIST(first);
3278 first->op_next = (OP*)logop;
79072805 3279
b1cb66bf 3280 first->op_sibling = trueop;
3281 trueop->op_sibling = falseop;
1a67a97c 3282 o = newUNOP(OP_NULL, 0, (OP*)logop);
79072805 3283
1a67a97c 3284 trueop->op_next = falseop->op_next = o;
79072805 3285
1a67a97c 3286 o->op_next = start;
11343788 3287 return o;
79072805
LW		 3288}
3289
3290OP *
864dbfa3 3291Perl_newRANGE(pTHX_ I32 flags, OP *left, OP *right)
79072805 3292{
b35b2403 3293 dTHR;
1a67a97c 3294 LOGOP *range;
79072805
LW		 3295 OP *flip;
3296 OP *flop;
1a67a97c 3297 OP *leftstart;
11343788 3298 OP *o;
79072805 3299
1a67a97c 3300 NewOp(1101, range, 1, LOGOP);
79072805 3301
1a67a97c
SM		 3302 range->op_type = OP_RANGE;
3303 range->op_ppaddr = PL_ppaddr[OP_RANGE];
3304 range->op_first = left;
3305 range->op_flags = OPf_KIDS;
3306 leftstart = LINKLIST(left);
3307 range->op_other = LINKLIST(right);
3308 range->op_private = 1 | (flags >> 8);
79072805
LW		 3309
3310 left->op_sibling = right;
3311
1a67a97c
SM		 3312 range->op_next = (OP*)range;
3313 flip = newUNOP(OP_FLIP, flags, (OP*)range);
79072805 3314 flop = newUNOP(OP_FLOP, 0, flip);
11343788 3315 o = newUNOP(OP_NULL, 0, flop);
79072805 3316 linklist(flop);
1a67a97c 3317 range->op_next = leftstart;
79072805
LW		 3318
3319 left->op_next = flip;
3320 right->op_next = flop;
3321
1a67a97c
SM		 3322 range->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
3323 sv_upgrade(PAD_SV(range->op_targ), SVt_PVNV);
ed6116ce 3324 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 3325 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
3326
3327 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3328 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3329
11343788 3330 flip->op_next = o;
79072805 3331 if (!flip->op_private || !flop->op_private)
11343788 3332 linklist(o); /* blow off optimizer unless constant */
79072805 3333
11343788 3334 return o;
79072805
LW		 3335}
3336
3337OP *
864dbfa3 3338Perl_newLOOPOP(pTHX_ I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 3339{
11343788 3340 dTHR;
463ee0b2 3341 OP* listop;
11343788 3342 OP* o;
463ee0b2 3343 int once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 3344 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
93a17b20 3345
463ee0b2
LW		 3346 if (expr) {
3347 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
3348 return block; /* do {} while 0 does once */
fb73857a 3349 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3350 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 3351 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3352 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 3353 } else if (expr->op_flags & OPf_KIDS) {
3354 OP *k1 = ((UNOP*)expr)->op_first;
3355 OP *k2 = (k1) ? k1->op_sibling : NULL;
3356 switch (expr->op_type) {
3357 case OP_NULL:
3358 if (k2 && k2->op_type == OP_READLINE
3359 && (k2->op_flags & OPf_STACKED)
3360 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
3361 expr = newUNOP(OP_DEFINED, 0, expr);
3362 break;
3363
3364 case OP_SASSIGN:
3365 if (k1->op_type == OP_READDIR
3366 || k1->op_type == OP_GLOB
3367 || k1->op_type == OP_EACH)
3368 expr = newUNOP(OP_DEFINED, 0, expr);
3369 break;
3370 }
774d564b 3371 }
463ee0b2 3372 }
93a17b20 3373
8990e307 3374 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
883ffac3 3375 o = new_logop(OP_AND, 0, &expr, &listop);
463ee0b2 3376
883ffac3
CS		 3377 if (listop)
3378 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 3379
11343788
MB		 3380 if (once && o != listop)
3381 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 3382
11343788
MB		 3383 if (o == listop)
3384 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 3385
11343788
MB		 3386 o->op_flags |= flags;
3387 o = scope(o);
3388 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
3389 return o;
79072805
LW		 3390}
3391
3392OP *
864dbfa3 3393Perl_newWHILEOP(pTHX_ I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *expr, OP *block, OP *cont)
79072805 3394{
11343788 3395 dTHR;
79072805
LW		 3396 OP *redo;
3397 OP *next = 0;
3398 OP *listop;
11343788 3399 OP *o;
79072805
LW		 3400 OP *condop;
3401
fb73857a 3402 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3403 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB))) {
748a9306 3404 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3405 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 3406 } else if (expr && (expr->op_flags & OPf_KIDS)) {
3407 OP *k1 = ((UNOP*)expr)->op_first;
3408 OP *k2 = (k1) ? k1->op_sibling : NULL;
3409 switch (expr->op_type) {
3410 case OP_NULL:
3411 if (k2 && k2->op_type == OP_READLINE
3412 && (k2->op_flags & OPf_STACKED)
3413 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
3414 expr = newUNOP(OP_DEFINED, 0, expr);
3415 break;
3416
3417 case OP_SASSIGN:
3418 if (k1->op_type == OP_READDIR
3419 || k1->op_type == OP_GLOB
3420 || k1->op_type == OP_EACH)
3421 expr = newUNOP(OP_DEFINED, 0, expr);
3422 break;
3423 }
748a9306 3424 }
79072805
LW		 3425
3426 if (!block)
3427 block = newOP(OP_NULL, 0);
3428
3429 if (cont)
3430 next = LINKLIST(cont);
fb73857a 3431 if (expr) {
79072805 3432 cont = append_elem(OP_LINESEQ, cont, newOP(OP_UNSTACK, 0));
fb73857a 3433 if ((line_t)whileline != NOLINE) {
3280af22 3434 PL_copline = whileline;
fb73857a 3435 cont = append_elem(OP_LINESEQ, cont,
3436 newSTATEOP(0, Nullch, Nullop));
3437 }
3438 }
79072805 3439
463ee0b2 3440 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 3441 redo = LINKLIST(listop);
3442
3443 if (expr) {
3280af22 3444 PL_copline = whileline;
883ffac3
CS		 3445 scalar(listop);
3446 o = new_logop(OP_AND, 0, &expr, &listop);
11343788 3447 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 3448 op_free(expr); /* oops, it's a while (0) */
463ee0b2 3449 op_free((OP*)loop);
883ffac3 3450 return Nullop; /* listop already freed by new_logop */
463ee0b2 3451 }
883ffac3
CS		 3452 if (listop)
3453 ((LISTOP*)listop)->op_last->op_next = condop =
3454 (o == listop ? redo : LINKLIST(o));
79072805
LW		 3455 if (!next)
3456 next = condop;
3457 }
3458 else
11343788 3459 o = listop;
79072805
LW		 3460
3461 if (!loop) {
b7dc083c 3462 NewOp(1101,loop,1,LOOP);
79072805 3463 loop->op_type = OP_ENTERLOOP;
22c35a8c 3464 loop->op_ppaddr = PL_ppaddr[OP_ENTERLOOP];
79072805
LW		 3465 loop->op_private = 0;
3466 loop->op_next = (OP*)loop;
3467 }
3468
11343788 3469 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 3470
3471 loop->op_redoop = redo;
11343788 3472 loop->op_lastop = o;
79072805
LW		 3473
3474 if (next)
3475 loop->op_nextop = next;
3476 else
11343788 3477 loop->op_nextop = o;
79072805 3478
11343788
MB		 3479 o->op_flags |= flags;
3480 o->op_private |= (flags >> 8);
3481 return o;
79072805
LW		 3482}
3483
3484OP *
864dbfa3 3485Perl_newFOROP(pTHX_ I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *block,OP *cont)
79072805
LW		 3486{
3487 LOOP *loop;
b7dc083c 3488 LOOP *tmp;
fb73857a 3489 OP *wop;
85e6fe83 3490 int padoff = 0;
4633a7c4 3491 I32 iterflags = 0;
79072805 3492
79072805 3493 if (sv) {
85e6fe83 3494 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
748a9306 3495 sv->op_type = OP_RV2GV;
22c35a8c 3496 sv->op_ppaddr = PL_ppaddr[OP_RV2GV];
79072805 3497 }
85e6fe83
LW		 3498 else if (sv->op_type == OP_PADSV) { /* private variable */
3499 padoff = sv->op_targ;
3500 op_free(sv);
3501 sv = Nullop;
3502 }
54b9620d
MB		 3503 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
3504 padoff = sv->op_targ;
3505