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add do-not-edit caveats for files generated by opcode.pl
[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
LW		 416{
417 I32 off;
3280af22 418 SV **svp = AvARRAY(PL_comppad_name);
93a17b20 419 SV *sv;
3280af22
NIS		 420 if (PL_min_intro_pending && fill < PL_min_intro_pending) {
421 for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) {
422 if ((sv = svp[off]) && sv != &PL_sv_undef)
cea2e8a9 423 Perl_warn(aTHX_ "%s never introduced", SvPVX(sv));
8990e307
LW		 424 }
425 }
426 /* "Deintroduce" my variables that are leaving with this scope. */
3280af22 427 for (off = AvFILLp(PL_comppad_name); off > fill; off--) {
c53d7c7d 428 if ((sv = svp[off]) && sv != &PL_sv_undef && SvIVX(sv) == PAD_MAX)
3280af22 429 SvIVX(sv) = PL_cop_seqmax;
93a17b20
LW		 430 }
431}
432
433PADOFFSET
864dbfa3 434Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype)
79072805 435{
11343788 436 dTHR;
79072805
LW		 437 SV *sv;
438 I32 retval;
439
3280af22 440 if (AvARRAY(PL_comppad) != PL_curpad)
cea2e8a9 441 Perl_croak(aTHX_ "panic: pad_alloc");
3280af22 442 if (PL_pad_reset_pending)
a0d0e21e 443 pad_reset();
ed6116ce 444 if (tmptype & SVs_PADMY) {
79072805 445 do {
3280af22 446 sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE);
ed6116ce 447 } while (SvPADBUSY(sv)); /* need a fresh one */
3280af22 448 retval = AvFILLp(PL_comppad);
79072805
LW		 449 }
450 else {
3280af22
NIS		 451 SV **names = AvARRAY(PL_comppad_name);
452 SSize_t names_fill = AvFILLp(PL_comppad_name);
bbce6d69 453 for (;;) {
454 /*
455 * "foreach" index vars temporarily become aliases to non-"my"
456 * values. Thus we must skip, not just pad values that are
457 * marked as current pad values, but also those with names.
458 */
3280af22
NIS		 459 if (++PL_padix <= names_fill &&
460 (sv = names[PL_padix]) && sv != &PL_sv_undef)
bbce6d69 461 continue;
3280af22 462 sv = *av_fetch(PL_comppad, PL_padix, TRUE);
bbce6d69 463 if (!(SvFLAGS(sv) & (SVs_PADTMP|SVs_PADMY)))
464 break;
465 }
3280af22 466 retval = PL_padix;
79072805 467 }
8990e307 468 SvFLAGS(sv) |= tmptype;
3280af22 469 PL_curpad = AvARRAY(PL_comppad);
11343788 470#ifdef USE_THREADS
5dc0d613 471 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx alloc %ld for %s\n",
533c011a 472 (unsigned long) thr, (unsigned long) PL_curpad,
22c35a8c 473 (long) retval, PL_op_name[optype]));
11343788 474#else
d9bb4600 475 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx alloc %ld for %s\n",
3280af22 476 (unsigned long) PL_curpad,
22c35a8c 477 (long) retval, PL_op_name[optype]));
11343788 478#endif /* USE_THREADS */
79072805
LW		 479 return (PADOFFSET)retval;
480}
481
482SV *
864dbfa3 483Perl_pad_sv(pTHX_ PADOFFSET po)
79072805 484{
11343788
MB		 485 dTHR;
486#ifdef USE_THREADS
5dc0d613 487 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx sv %d\n",
533c011a 488 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 489#else
79072805 490 if (!po)
cea2e8a9 491 Perl_croak(aTHX_ "panic: pad_sv po");
d9bb4600 492 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx sv %d\n",
3280af22 493 (unsigned long) PL_curpad, po));
11343788 494#endif /* USE_THREADS */
3280af22 495 return PL_curpad[po]; /* eventually we'll turn this into a macro */
79072805
LW		 496}
497
498void
864dbfa3 499Perl_pad_free(pTHX_ PADOFFSET po)
79072805 500{
11343788 501 dTHR;
3280af22 502 if (!PL_curpad)
a0d0e21e 503 return;
3280af22 504 if (AvARRAY(PL_comppad) != PL_curpad)
cea2e8a9 505 Perl_croak(aTHX_ "panic: pad_free curpad");
79072805 506 if (!po)
cea2e8a9 507 Perl_croak(aTHX_ "panic: pad_free po");
11343788 508#ifdef USE_THREADS
5dc0d613 509 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx free %d\n",
533c011a 510 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 511#else
d9bb4600 512 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx free %d\n",
3280af22 513 (unsigned long) PL_curpad, po));
11343788 514#endif /* USE_THREADS */
3280af22
NIS		 515 if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef)
516 SvPADTMP_off(PL_curpad[po]);
517 if ((I32)po < PL_padix)
518 PL_padix = po - 1;
79072805
LW		 519}
520
521void
864dbfa3 522Perl_pad_swipe(pTHX_ PADOFFSET po)
79072805 523{
11343788 524 dTHR;
3280af22 525 if (AvARRAY(PL_comppad) != PL_curpad)
cea2e8a9 526 Perl_croak(aTHX_ "panic: pad_swipe curpad");
79072805 527 if (!po)
cea2e8a9 528 Perl_croak(aTHX_ "panic: pad_swipe po");
11343788 529#ifdef USE_THREADS
5dc0d613 530 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx swipe %d\n",
533c011a 531 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 532#else
d9bb4600 533 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx swipe %d\n",
3280af22 534 (unsigned long) PL_curpad, po));
11343788 535#endif /* USE_THREADS */
3280af22
NIS		 536 SvPADTMP_off(PL_curpad[po]);
537 PL_curpad[po] = NEWSV(1107,0);
538 SvPADTMP_on(PL_curpad[po]);
539 if ((I32)po < PL_padix)
540 PL_padix = po - 1;
79072805
LW		 541}
542
d9bb4600
GS		 543/* XXX pad_reset() is currently disabled because it results in serious bugs.
544 * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed
545 * on the stack by OPs that use them, there are several ways to get an alias
546 * to a shared TARG. Such an alias will change randomly and unpredictably.
547 * We avoid doing this until we can think of a Better Way.
548 * GSAR 97-10-29 */
79072805 549void
864dbfa3 550Perl_pad_reset(pTHX)
79072805 551{
d9bb4600 552#ifdef USE_BROKEN_PAD_RESET
11343788 553 dTHR;
79072805
LW		 554 register I32 po;
555
6b88bc9c 556 if (AvARRAY(PL_comppad) != PL_curpad)
cea2e8a9 557 Perl_croak(aTHX_ "panic: pad_reset curpad");
11343788 558#ifdef USE_THREADS
5dc0d613 559 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx reset\n",
6b88bc9c 560 (unsigned long) thr, (unsigned long) PL_curpad));
11343788 561#else
d9bb4600 562 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx reset\n",
6b88bc9c 563 (unsigned long) PL_curpad));
11343788 564#endif /* USE_THREADS */
6b88bc9c
GS		 565 if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */
566 for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) {
567 if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po]))
568 SvPADTMP_off(PL_curpad[po]);
748a9306 569 }
6b88bc9c 570 PL_padix = PL_padix_floor;
79072805 571 }
d9bb4600 572#endif
3280af22 573 PL_pad_reset_pending = FALSE;
79072805
LW		 574}
575
a863c7d1 576#ifdef USE_THREADS
54b9620d 577/* find_threadsv is not reentrant */
a863c7d1 578PADOFFSET
864dbfa3 579Perl_find_threadsv(pTHX_ const char *name)
a863c7d1
MB		 580{
581 dTHR;
582 char *p;
583 PADOFFSET key;
554b3eca 584 SV **svp;
54b9620d 585 /* We currently only handle names of a single character */
533c011a 586 p = strchr(PL_threadsv_names, *name);
a863c7d1
MB		 587 if (!p)
588 return NOT_IN_PAD;
533c011a 589 key = p - PL_threadsv_names;
2d8e6c8d 590 MUTEX_LOCK(&thr->mutex);
54b9620d 591 svp = av_fetch(thr->threadsv, key, FALSE);
2d8e6c8d
GS		 592 if (svp)
593 MUTEX_UNLOCK(&thr->mutex);
594 else {
554b3eca 595 SV *sv = NEWSV(0, 0);
54b9620d 596 av_store(thr->threadsv, key, sv);
940cb80d 597 thr->threadsvp = AvARRAY(thr->threadsv);
2d8e6c8d 598 MUTEX_UNLOCK(&thr->mutex);
554b3eca
MB		 599 /*
600 * Some magic variables used to be automagically initialised
601 * in gv_fetchpv. Those which are now per-thread magicals get
602 * initialised here instead.
603 */
604 switch (*name) {
54b9620d
MB		 605 case '_':
606 break;
554b3eca
MB		 607 case ';':
608 sv_setpv(sv, "\034");
54b9620d 609 sv_magic(sv, 0, 0, name, 1);
554b3eca 610 break;
c277df42
IZ		 611 case '&':
612 case '`':
613 case '\'':
533c011a 614 PL_sawampersand = TRUE;
a3f914c5
GS		 615 /* FALL THROUGH */
616 case '1':
617 case '2':
618 case '3':
619 case '4':
620 case '5':
621 case '6':
622 case '7':
623 case '8':
624 case '9':
c277df42 625 SvREADONLY_on(sv);
d8b5173a 626 /* FALL THROUGH */
067391ea
GS		 627
628 /* XXX %! tied to Errno.pm needs to be added here.
629 * See gv_fetchpv(). */
630 /* case '!': */
631
54b9620d
MB		 632 default:
633 sv_magic(sv, 0, 0, name, 1);
554b3eca 634 }
8b73bbec 635 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
54b9620d 636 "find_threadsv: new SV %p for $%s%c\n",
554b3eca
MB		 637 sv, (*name < 32) ? "^" : "",
638 (*name < 32) ? toCTRL(*name) : *name));
a863c7d1
MB		 639 }
640 return key;
641}
642#endif /* USE_THREADS */
643
79072805
LW		 644/* Destructor */
645
646void
864dbfa3 647Perl_op_free(pTHX_ OP *o)
79072805 648{
85e6fe83 649 register OP *kid, *nextkid;
79072805 650
5dc0d613 651 if (!o || o->op_seq == (U16)-1)
79072805
LW		 652 return;
653
11343788
MB		 654 if (o->op_flags & OPf_KIDS) {
655 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 656 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 657 op_free(kid);
85e6fe83 658 }
79072805
LW		 659 }
660
11343788 661 switch (o->op_type) {
8990e307 662 case OP_NULL:
11343788 663 o->op_targ = 0; /* Was holding old type, if any. */
8990e307 664 break;
a0d0e21e 665 case OP_ENTEREVAL:
11343788 666 o->op_targ = 0; /* Was holding hints. */
a0d0e21e 667 break;
554b3eca 668#ifdef USE_THREADS
8dd3ba40
SM		 669 case OP_ENTERITER:
670 if (!(o->op_flags & OPf_SPECIAL))
671 break;
672 /* FALL THROUGH */
2faa37cc 673 case OP_THREADSV:
54b9620d 674 o->op_targ = 0; /* Was holding index into thr->threadsv AV. */
554b3eca
MB		 675 break;
676#endif /* USE_THREADS */
a6006777 677 default:
ac4c12e7 678 if (!(o->op_flags & OPf_REF)
cea2e8a9 679 || (PL_check[o->op_type] != FUNC_NAME_TO_PTR(Perl_ck_ftst)))
a6006777 680 break;
681 /* FALL THROUGH */
463ee0b2 682 case OP_GVSV:
79072805 683 case OP_GV:
a6006777 684 case OP_AELEMFAST:
11343788 685 SvREFCNT_dec(cGVOPo->op_gv);
8990e307
LW		 686 break;
687 case OP_NEXTSTATE:
688 case OP_DBSTATE:
5196be3e 689 Safefree(cCOPo->cop_label);
11343788 690 SvREFCNT_dec(cCOPo->cop_filegv);
599cee73
PM		 691 if (cCOPo->cop_warnings != WARN_NONE && cCOPo->cop_warnings != WARN_ALL)
692 SvREFCNT_dec(cCOPo->cop_warnings);
79072805
LW		 693 break;
694 case OP_CONST:
11343788 695 SvREFCNT_dec(cSVOPo->op_sv);
79072805 696 break;
748a9306
LW		 697 case OP_GOTO:
698 case OP_NEXT:
699 case OP_LAST:
700 case OP_REDO:
11343788 701 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 702 break;
703 /* FALL THROUGH */
a0d0e21e 704 case OP_TRANS:
a0ed51b3
LW		 705 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF))
706 SvREFCNT_dec(cSVOPo->op_sv);
707 else
708 Safefree(cPVOPo->op_pv);
a0d0e21e
LW		 709 break;
710 case OP_SUBST:
11343788 711 op_free(cPMOPo->op_pmreplroot);
a0d0e21e 712 /* FALL THROUGH */
748a9306 713 case OP_PUSHRE:
a0d0e21e 714 case OP_MATCH:
8782bef2 715 case OP_QR:
c277df42 716 ReREFCNT_dec(cPMOPo->op_pmregexp);
a0d0e21e 717 break;
79072805
LW		 718 }
719
11343788
MB		 720 if (o->op_targ > 0)
721 pad_free(o->op_targ);
8990e307 722
b7dc083c
NIS		 723#ifdef PL_OP_SLAB_ALLOC
724 if ((char *) o == PL_OpPtr)
725 {
726 }
727#else
11343788 728 Safefree(o);
b7dc083c 729#endif
79072805
LW		 730}
731
76e3520e 732STATIC void
cea2e8a9 733S_null(pTHX_ OP *o)
8990e307 734{
54b9620d 735 if (o->op_type != OP_NULL && o->op_type != OP_THREADSV && o->op_targ > 0)
11343788
MB		 736 pad_free(o->op_targ);
737 o->op_targ = o->op_type;
738 o->op_type = OP_NULL;
22c35a8c 739 o->op_ppaddr = PL_ppaddr[OP_NULL];
8990e307
LW		 740}
741
79072805
LW		 742/* Contextualizers */
743
463ee0b2 744#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 745
746OP *
864dbfa3 747Perl_linklist(pTHX_ OP *o)
79072805
LW		 748{
749 register OP *kid;
750
11343788
MB		 751 if (o->op_next)
752 return o->op_next;
79072805
LW		 753
754 /* establish postfix order */
11343788
MB		 755 if (cUNOPo->op_first) {
756 o->op_next = LINKLIST(cUNOPo->op_first);
757 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 758 if (kid->op_sibling)
759 kid->op_next = LINKLIST(kid->op_sibling);
760 else
11343788 761 kid->op_next = o;
79072805
LW		 762 }
763 }
764 else
11343788 765 o->op_next = o;
79072805 766
11343788 767 return o->op_next;
79072805
LW		 768}
769
770OP *
864dbfa3 771Perl_scalarkids(pTHX_ OP *o)
79072805
LW		 772{
773 OP *kid;
11343788
MB		 774 if (o && o->op_flags & OPf_KIDS) {
775 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 776 scalar(kid);
777 }
11343788 778 return o;
79072805
LW		 779}
780
76e3520e 781STATIC OP *
cea2e8a9 782S_scalarboolean(pTHX_ OP *o)
8990e307 783{
d008e5eb 784 if (o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
0f15f207 785 dTHR;
d008e5eb
GS		 786 if (ckWARN(WARN_SYNTAX)) {
787 line_t oldline = PL_curcop->cop_line;
a0d0e21e 788
d008e5eb
GS		 789 if (PL_copline != NOLINE)
790 PL_curcop->cop_line = PL_copline;
cea2e8a9 791 Perl_warner(aTHX_ WARN_SYNTAX, "Found = in conditional, should be ==");
d008e5eb
GS		 792 PL_curcop->cop_line = oldline;
793 }
a0d0e21e 794 }
11343788 795 return scalar(o);
8990e307
LW		 796}
797
798OP *
864dbfa3 799Perl_scalar(pTHX_ OP *o)
79072805
LW		 800{
801 OP *kid;
802
a0d0e21e 803 /* assumes no premature commitment */
3280af22 804 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 805 || o->op_type == OP_RETURN)
11343788 806 return o;
79072805 807
b162f9ea
IZ		 808 if ((o->op_private & OPpTARGET_MY)
809 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
810 return scalar(o); /* As if inside SASSIGN */
811
5dc0d613 812 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 813
11343788 814 switch (o->op_type) {
79072805 815 case OP_REPEAT:
11343788
MB		 816 if (o->op_private & OPpREPEAT_DOLIST)
817 null(((LISTOP*)cBINOPo->op_first)->op_first);
818 scalar(cBINOPo->op_first);
8990e307 819 break;
79072805
LW		 820 case OP_OR:
821 case OP_AND:
822 case OP_COND_EXPR:
11343788 823 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 824 scalar(kid);
79072805 825 break;
a0d0e21e 826 case OP_SPLIT:
11343788 827 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 828 if (!kPMOP->op_pmreplroot)
829 deprecate("implicit split to @_");
830 }
831 /* FALL THROUGH */
79072805 832 case OP_MATCH:
8782bef2 833 case OP_QR:
79072805
LW		 834 case OP_SUBST:
835 case OP_NULL:
8990e307 836 default:
11343788
MB		 837 if (o->op_flags & OPf_KIDS) {
838 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 839 scalar(kid);
840 }
79072805
LW		 841 break;
842 case OP_LEAVE:
843 case OP_LEAVETRY:
5dc0d613 844 kid = cLISTOPo->op_first;
54310121 845 scalar(kid);
846 while (kid = kid->op_sibling) {
847 if (kid->op_sibling)
848 scalarvoid(kid);
849 else
850 scalar(kid);
851 }
3280af22 852 WITH_THR(PL_curcop = &PL_compiling);
54310121 853 break;
748a9306 854 case OP_SCOPE:
79072805 855 case OP_LINESEQ:
8990e307 856 case OP_LIST:
11343788 857 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 858 if (kid->op_sibling)
859 scalarvoid(kid);
860 else
861 scalar(kid);
862 }
3280af22 863 WITH_THR(PL_curcop = &PL_compiling);
79072805
LW		 864 break;
865 }
11343788 866 return o;
79072805
LW		 867}
868
869OP *
864dbfa3 870Perl_scalarvoid(pTHX_ OP *o)
79072805
LW		 871{
872 OP *kid;
8990e307
LW		 873 char* useless = 0;
874 SV* sv;
2ebea0a1
GS		 875 U8 want;
876
877 if (o->op_type == OP_NEXTSTATE || o->op_type == OP_DBSTATE ||
878 (o->op_type == OP_NULL &&
879 (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)))
880 {
881 dTHR;
882 PL_curcop = (COP*)o; /* for warning below */
883 }
79072805 884
54310121 885 /* assumes no premature commitment */
2ebea0a1
GS		 886 want = o->op_flags & OPf_WANT;
887 if ((want && want != OPf_WANT_SCALAR) || PL_error_count
5dc0d613 888 || o->op_type == OP_RETURN)
11343788 889 return o;
79072805 890
b162f9ea
IZ		 891 if ((o->op_private & OPpTARGET_MY)
892 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
893 return scalar(o); /* As if inside SASSIGN */
894
5dc0d613 895 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 896
11343788 897 switch (o->op_type) {
79072805 898 default:
22c35a8c 899 if (!(PL_opargs[o->op_type] & OA_FOLDCONST))
8990e307 900 break;
36477c24 901 /* FALL THROUGH */
902 case OP_REPEAT:
11343788 903 if (o->op_flags & OPf_STACKED)
8990e307 904 break;
5d82c453
GA		 905 goto func_ops;
906 case OP_SUBSTR:
907 if (o->op_private == 4)
908 break;
8990e307
LW		 909 /* FALL THROUGH */
910 case OP_GVSV:
911 case OP_WANTARRAY:
912 case OP_GV:
913 case OP_PADSV:
914 case OP_PADAV:
915 case OP_PADHV:
916 case OP_PADANY:
917 case OP_AV2ARYLEN:
8990e307 918 case OP_REF:
a0d0e21e
LW		 919 case OP_REFGEN:
920 case OP_SREFGEN:
8990e307
LW		 921 case OP_DEFINED:
922 case OP_HEX:
923 case OP_OCT:
924 case OP_LENGTH:
8990e307
LW		 925 case OP_VEC:
926 case OP_INDEX:
927 case OP_RINDEX:
928 case OP_SPRINTF:
929 case OP_AELEM:
930 case OP_AELEMFAST:
931 case OP_ASLICE:
8990e307
LW		 932 case OP_HELEM:
933 case OP_HSLICE:
934 case OP_UNPACK:
935 case OP_PACK:
8990e307
LW		 936 case OP_JOIN:
937 case OP_LSLICE:
938 case OP_ANONLIST:
939 case OP_ANONHASH:
940 case OP_SORT:
941 case OP_REVERSE:
942 case OP_RANGE:
943 case OP_FLIP:
944 case OP_FLOP:
945 case OP_CALLER:
946 case OP_FILENO:
947 case OP_EOF:
948 case OP_TELL:
949 case OP_GETSOCKNAME:
950 case OP_GETPEERNAME:
951 case OP_READLINK:
952 case OP_TELLDIR:
953 case OP_GETPPID:
954 case OP_GETPGRP:
955 case OP_GETPRIORITY:
956 case OP_TIME:
957 case OP_TMS:
958 case OP_LOCALTIME:
959 case OP_GMTIME:
960 case OP_GHBYNAME:
961 case OP_GHBYADDR:
962 case OP_GHOSTENT:
963 case OP_GNBYNAME:
964 case OP_GNBYADDR:
965 case OP_GNETENT:
966 case OP_GPBYNAME:
967 case OP_GPBYNUMBER:
968 case OP_GPROTOENT:
969 case OP_GSBYNAME:
970 case OP_GSBYPORT:
971 case OP_GSERVENT:
972 case OP_GPWNAM:
973 case OP_GPWUID:
974 case OP_GGRNAM:
975 case OP_GGRGID:
976 case OP_GETLOGIN:
5d82c453 977 func_ops:
11343788 978 if (!(o->op_private & OPpLVAL_INTRO))
22c35a8c 979 useless = PL_op_desc[o->op_type];
8990e307
LW		 980 break;
981
982 case OP_RV2GV:
983 case OP_RV2SV:
984 case OP_RV2AV:
985 case OP_RV2HV:
11343788
MB		 986 if (!(o->op_private & OPpLVAL_INTRO) &&
987 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 988 useless = "a variable";
989 break;
79072805
LW		 990
991 case OP_CONST:
11343788 992 sv = cSVOPo->op_sv;
7a52d87a
GS		 993 if (cSVOPo->op_private & OPpCONST_STRICT)
994 no_bareword_allowed(o);
995 else {
d008e5eb
GS		 996 dTHR;
997 if (ckWARN(WARN_VOID)) {
998 useless = "a constant";
999 if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
1000 useless = 0;
1001 else if (SvPOK(sv)) {
1002 if (strnEQ(SvPVX(sv), "di", 2) ||
1003 strnEQ(SvPVX(sv), "ds", 2) ||
1004 strnEQ(SvPVX(sv), "ig", 2))
1005 useless = 0;
1006 }
8990e307
LW		 1007 }
1008 }
11343788 1009 null(o); /* don't execute a constant */
8990e307 1010 SvREFCNT_dec(sv); /* don't even remember it */
79072805
LW		 1011 break;
1012
1013 case OP_POSTINC:
11343788 1014 o->op_type = OP_PREINC; /* pre-increment is faster */
22c35a8c 1015 o->op_ppaddr = PL_ppaddr[OP_PREINC];
79072805
LW		 1016 break;
1017
1018 case OP_POSTDEC:
11343788 1019 o->op_type = OP_PREDEC; /* pre-decrement is faster */
22c35a8c 1020 o->op_ppaddr = PL_ppaddr[OP_PREDEC];
79072805
LW		 1021 break;
1022
79072805
LW		 1023 case OP_OR:
1024 case OP_AND:
1025 case OP_COND_EXPR:
11343788 1026 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 1027 scalarvoid(kid);
1028 break;
5aabfad6 1029
a0d0e21e 1030 case OP_NULL:
11343788 1031 if (o->op_flags & OPf_STACKED)
a0d0e21e 1032 break;
5aabfad6 1033 /* FALL THROUGH */
2ebea0a1
GS		 1034 case OP_NEXTSTATE:
1035 case OP_DBSTATE:
79072805
LW		 1036 case OP_ENTERTRY:
1037 case OP_ENTER:
1038 case OP_SCALAR:
11343788 1039 if (!(o->op_flags & OPf_KIDS))
79072805 1040 break;
54310121 1041 /* FALL THROUGH */
463ee0b2 1042 case OP_SCOPE:
79072805
LW		 1043 case OP_LEAVE:
1044 case OP_LEAVETRY:
a0d0e21e 1045 case OP_LEAVELOOP:
79072805 1046 case OP_LINESEQ:
79072805 1047 case OP_LIST:
11343788 1048 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 1049 scalarvoid(kid);
1050 break;
c90c0ff4 1051 case OP_ENTEREVAL:
5196be3e 1052 scalarkids(o);
c90c0ff4 1053 break;
5aabfad6 1054 case OP_REQUIRE:
c90c0ff4 1055 /* all requires must return a boolean value */
5196be3e
MB		 1056 o->op_flags &= ~OPf_WANT;
1057 return scalar(o);
a0d0e21e 1058 case OP_SPLIT:
11343788 1059 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 1060 if (!kPMOP->op_pmreplroot)
1061 deprecate("implicit split to @_");
1062 }
1063 break;
79072805 1064 }
d008e5eb
GS		 1065 if (useless) {
1066 dTHR;
1067 if (ckWARN(WARN_VOID))
cea2e8a9 1068 Perl_warner(aTHX_ WARN_VOID, "Useless use of %s in void context", useless);
d008e5eb 1069 }
11343788 1070 return o;
79072805
LW		 1071}
1072
1073OP *
864dbfa3 1074Perl_listkids(pTHX_ OP *o)
79072805
LW		 1075{
1076 OP *kid;
11343788
MB		 1077 if (o && o->op_flags & OPf_KIDS) {
1078 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 1079 list(kid);
1080 }
11343788 1081 return o;
79072805
LW		 1082}
1083
1084OP *
864dbfa3 1085Perl_list(pTHX_ OP *o)
79072805
LW		 1086{
1087 OP *kid;
1088
a0d0e21e 1089 /* assumes no premature commitment */
3280af22 1090 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 1091 || o->op_type == OP_RETURN)
11343788 1092 return o;
79072805 1093
b162f9ea
IZ		 1094 if ((o->op_private & OPpTARGET_MY)
1095 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
1096 return o; /* As if inside SASSIGN */
1097
5dc0d613 1098 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 1099
11343788 1100 switch (o->op_type) {
79072805
LW		 1101 case OP_FLOP:
1102 case OP_REPEAT:
11343788 1103 list(cBINOPo->op_first);
79072805
LW		 1104 break;
1105 case OP_OR:
1106 case OP_AND:
1107 case OP_COND_EXPR:
11343788 1108 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 1109 list(kid);
1110 break;
1111 default:
1112 case OP_MATCH:
8782bef2 1113 case OP_QR:
79072805
LW		 1114 case OP_SUBST:
1115 case OP_NULL:
11343788 1116 if (!(o->op_flags & OPf_KIDS))
79072805 1117 break;
11343788
MB		 1118 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
1119 list(cBINOPo->op_first);
1120 return gen_constant_list(o);
79072805
LW		 1121 }
1122 case OP_LIST:
11343788 1123 listkids(o);
79072805
LW		 1124 break;
1125 case OP_LEAVE:
1126 case OP_LEAVETRY:
5dc0d613 1127 kid = cLISTOPo->op_first;
54310121 1128 list(kid);
1129 while (kid = kid->op_sibling) {
1130 if (kid->op_sibling)
1131 scalarvoid(kid);
1132 else
1133 list(kid);
1134 }
3280af22 1135 WITH_THR(PL_curcop = &PL_compiling);
54310121 1136 break;
748a9306 1137 case OP_SCOPE:
79072805 1138 case OP_LINESEQ:
11343788 1139 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 1140 if (kid->op_sibling)
1141 scalarvoid(kid);
1142 else
1143 list(kid);
1144 }
3280af22 1145 WITH_THR(PL_curcop = &PL_compiling);
79072805 1146 break;
c90c0ff4 1147 case OP_REQUIRE:
1148 /* all requires must return a boolean value */
5196be3e
MB		 1149 o->op_flags &= ~OPf_WANT;
1150 return scalar(o);
79072805 1151 }
11343788 1152 return o;
79072805
LW		 1153}
1154
1155OP *
864dbfa3 1156Perl_scalarseq(pTHX_ OP *o)
79072805
LW		 1157{
1158 OP *kid;
1159
11343788
MB		 1160 if (o) {
1161 if (o->op_type == OP_LINESEQ ||
1162 o->op_type == OP_SCOPE ||
1163 o->op_type == OP_LEAVE ||
1164 o->op_type == OP_LEAVETRY)
463ee0b2 1165 {
0f15f207 1166 dTHR;
11343788 1167 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 1168 if (kid->op_sibling) {
463ee0b2 1169 scalarvoid(kid);
ed6116ce 1170 }
463ee0b2 1171 }
3280af22 1172 PL_curcop = &PL_compiling;
79072805 1173 }
11343788 1174 o->op_flags &= ~OPf_PARENS;
3280af22 1175 if (PL_hints & HINT_BLOCK_SCOPE)
11343788 1176 o->op_flags |= OPf_PARENS;
79072805 1177 }
8990e307 1178 else
11343788
MB		 1179 o = newOP(OP_STUB, 0);
1180 return o;
79072805
LW		 1181}
1182
76e3520e 1183STATIC OP *
cea2e8a9 1184S_modkids(pTHX_ OP *o, I32 type)
79072805
LW		 1185{
1186 OP *kid;
11343788
MB		 1187 if (o && o->op_flags & OPf_KIDS) {
1188 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 1189 mod(kid, type);
79072805 1190 }
11343788 1191 return o;
79072805
LW		 1192}
1193
79072805 1194OP *
864dbfa3 1195Perl_mod(pTHX_ OP *o, I32 type)
79072805 1196{
11343788 1197 dTHR;
79072805
LW		 1198 OP *kid;
1199 SV *sv;
2d8e6c8d 1200 STRLEN n_a;
79072805 1201
3280af22 1202 if (!o || PL_error_count)
11343788 1203 return o;
79072805 1204
b162f9ea
IZ		 1205 if ((o->op_private & OPpTARGET_MY)
1206 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
1207 return o;
1208
11343788 1209 switch (o->op_type) {
68dc0745 1210 case OP_UNDEF:
3280af22 1211 PL_modcount++;
5dc0d613 1212 return o;
a0d0e21e 1213 case OP_CONST:
11343788 1214 if (!(o->op_private & (OPpCONST_ARYBASE)))
a0d0e21e 1215 goto nomod;
3280af22
NIS		 1216 if (PL_eval_start && PL_eval_start->op_type == OP_CONST) {
1217 PL_compiling.cop_arybase = (I32)SvIV(((SVOP*)PL_eval_start)->op_sv);
1218 PL_eval_start = 0;
a0d0e21e
LW		 1219 }
1220 else if (!type) {
3280af22
NIS		 1221 SAVEI32(PL_compiling.cop_arybase);
1222 PL_compiling.cop_arybase = 0;
a0d0e21e
LW		 1223 }
1224 else if (type == OP_REFGEN)
1225 goto nomod;
1226 else
cea2e8a9 1227 Perl_croak(aTHX_ "That use of $[ is unsupported");
a0d0e21e 1228 break;
5f05dabc 1229 case OP_STUB:
5196be3e 1230 if (o->op_flags & OPf_PARENS)
5f05dabc 1231 break;
1232 goto nomod;
a0d0e21e
LW		 1233 case OP_ENTERSUB:
1234 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1235 !(o->op_flags & OPf_STACKED)) {
1236 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1237 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788
MB		 1238 assert(cUNOPo->op_first->op_type == OP_NULL);
1239 null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1240 break;
1241 }
1242 /* FALL THROUGH */
1243 default:
a0d0e21e
LW		 1244 nomod:
1245 /* grep, foreach, subcalls, refgen */
1246 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
1247 break;
cea2e8a9 1248 yyerror(Perl_form(aTHX_ "Can't modify %s in %s",
638bc118 1249 (o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL)
22c35a8c
GS		 1250 ? "do block" : PL_op_desc[o->op_type]),
1251 type ? PL_op_desc[type] : "local"));
11343788 1252 return o;
79072805 1253
a0d0e21e
LW		 1254 case OP_PREINC:
1255 case OP_PREDEC:
1256 case OP_POW:
1257 case OP_MULTIPLY:
1258 case OP_DIVIDE:
1259 case OP_MODULO:
1260 case OP_REPEAT:
1261 case OP_ADD:
1262 case OP_SUBTRACT:
1263 case OP_CONCAT:
1264 case OP_LEFT_SHIFT:
1265 case OP_RIGHT_SHIFT:
1266 case OP_BIT_AND:
1267 case OP_BIT_XOR:
1268 case OP_BIT_OR:
1269 case OP_I_MULTIPLY:
1270 case OP_I_DIVIDE:
1271 case OP_I_MODULO:
1272 case OP_I_ADD:
1273 case OP_I_SUBTRACT:
11343788 1274 if (!(o->op_flags & OPf_STACKED))
a0d0e21e 1275 goto nomod;
3280af22 1276 PL_modcount++;
a0d0e21e
LW		 1277 break;
1278
79072805 1279 case OP_COND_EXPR:
11343788 1280 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1281 mod(kid, type);
79072805
LW		 1282 break;
1283
1284 case OP_RV2AV:
1285 case OP_RV2HV:
93af7a87 1286 if (!type && cUNOPo->op_first->op_type != OP_GV)
cea2e8a9 1287 Perl_croak(aTHX_ "Can't localize through a reference");
11343788 1288 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
3280af22 1289 PL_modcount = 10000;
11343788 1290 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1291 }
1292 /* FALL THROUGH */
79072805 1293 case OP_RV2GV:
5dc0d613 1294 if (scalar_mod_type(o, type))
3fe9a6f1 1295 goto nomod;
11343788 1296 ref(cUNOPo->op_first, o->op_type);
79072805
LW		 1297 /* FALL THROUGH */
1298 case OP_AASSIGN:
1299 case OP_ASLICE:
1300 case OP_HSLICE:
93a17b20
LW		 1301 case OP_NEXTSTATE:
1302 case OP_DBSTATE:
a0d0e21e
LW		 1303 case OP_REFGEN:
1304 case OP_CHOMP:
3280af22 1305 PL_modcount = 10000;
79072805 1306 break;
463ee0b2 1307 case OP_RV2SV:
11343788 1308 if (!type && cUNOPo->op_first->op_type != OP_GV)
cea2e8a9 1309 Perl_croak(aTHX_ "Can't localize through a reference");
aeea060c 1310 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1311 /* FALL THROUGH */
79072805 1312 case OP_GV:
463ee0b2 1313 case OP_AV2ARYLEN:
3280af22 1314 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1315 case OP_SASSIGN:
bf4b1e52
GS		 1316 case OP_ANDASSIGN:
1317 case OP_ORASSIGN:
8990e307 1318 case OP_AELEMFAST:
3280af22 1319 PL_modcount++;
8990e307
LW		 1320 break;
1321
748a9306
LW		 1322 case OP_PADAV:
1323 case OP_PADHV:
3280af22 1324 PL_modcount = 10000;
5196be3e
MB		 1325 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1326 return o; /* Treat \(@foo) like ordinary list. */
1327 if (scalar_mod_type(o, type))
3fe9a6f1 1328 goto nomod;
748a9306
LW		 1329 /* FALL THROUGH */
1330 case OP_PADSV:
3280af22 1331 PL_modcount++;
748a9306 1332 if (!type)
cea2e8a9 1333 Perl_croak(aTHX_ "Can't localize lexical variable %s",
2d8e6c8d 1334 SvPV(*av_fetch(PL_comppad_name, o->op_targ, 4), n_a));
463ee0b2
LW		 1335 break;
1336
554b3eca 1337#ifdef USE_THREADS
2faa37cc 1338 case OP_THREADSV:
533c011a 1339 PL_modcount++; /* XXX ??? */
554b3eca
MB		 1340 break;
1341#endif /* USE_THREADS */
1342
748a9306
LW		 1343 case OP_PUSHMARK:
1344 break;
a0d0e21e 1345
69969c6f
SB		 1346 case OP_KEYS:
1347 if (type != OP_SASSIGN)
1348 goto nomod;
5d82c453
GA		 1349 goto lvalue_func;
1350 case OP_SUBSTR:
1351 if (o->op_private == 4) /* don't allow 4 arg substr as lvalue */
1352 goto nomod;
5f05dabc 1353 /* FALL THROUGH */
a0d0e21e 1354 case OP_POS:
463ee0b2 1355 case OP_VEC:
5d82c453 1356 lvalue_func:
11343788
MB		 1357 pad_free(o->op_targ);
1358 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1359 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1360 if (o->op_flags & OPf_KIDS)
1361 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1362 break;
a0d0e21e 1363
463ee0b2
LW		 1364 case OP_AELEM:
1365 case OP_HELEM:
11343788 1366 ref(cBINOPo->op_first, o->op_type);
68dc0745 1367 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1368 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1369 o->op_private |= OPpLVAL_DEFER;
3280af22 1370 PL_modcount++;
463ee0b2
LW		 1371 break;
1372
1373 case OP_SCOPE:
1374 case OP_LEAVE:
1375 case OP_ENTER:
11343788
MB		 1376 if (o->op_flags & OPf_KIDS)
1377 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1378 break;
1379
1380 case OP_NULL:
638bc118
GS		 1381 if (o->op_flags & OPf_SPECIAL) /* do BLOCK */
1382 goto nomod;
1383 else if (!(o->op_flags & OPf_KIDS))
463ee0b2 1384 break;
11343788
MB		 1385 if (o->op_targ != OP_LIST) {
1386 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1387 break;
1388 }
1389 /* FALL THROUGH */
463ee0b2 1390 case OP_LIST:
11343788 1391 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1392 mod(kid, type);
1393 break;
1394 }
11343788 1395 o->op_flags |= OPf_MOD;
a0d0e21e
LW		 1396
1397 if (type == OP_AASSIGN || type == OP_SASSIGN)
11343788 1398 o->op_flags |= OPf_SPECIAL|OPf_REF;
a0d0e21e 1399 else if (!type) {
11343788
MB		 1400 o->op_private |= OPpLVAL_INTRO;
1401 o->op_flags &= ~OPf_SPECIAL;
3280af22 1402 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1403 }
a0d0e21e 1404 else if (type != OP_GREPSTART && type != OP_ENTERSUB)
11343788
MB		 1405 o->op_flags |= OPf_REF;
1406 return o;
463ee0b2
LW		 1407}
1408
864dbfa3 1409STATIC bool
cea2e8a9 1410S_scalar_mod_type(pTHX_ OP *o, I32 type)
3fe9a6f1 1411{
1412 switch (type) {
1413 case OP_SASSIGN:
5196be3e 1414 if (o->op_type == OP_RV2GV)
3fe9a6f1 1415 return FALSE;
1416 /* FALL THROUGH */
1417 case OP_PREINC:
1418 case OP_PREDEC:
1419 case OP_POSTINC:
1420 case OP_POSTDEC:
1421 case OP_I_PREINC:
1422 case OP_I_PREDEC:
1423 case OP_I_POSTINC:
1424 case OP_I_POSTDEC:
1425 case OP_POW:
1426 case OP_MULTIPLY:
1427 case OP_DIVIDE:
1428 case OP_MODULO:
1429 case OP_REPEAT:
1430 case OP_ADD:
1431 case OP_SUBTRACT:
1432 case OP_I_MULTIPLY:
1433 case OP_I_DIVIDE:
1434 case OP_I_MODULO:
1435 case OP_I_ADD:
1436 case OP_I_SUBTRACT:
1437 case OP_LEFT_SHIFT:
1438 case OP_RIGHT_SHIFT:
1439 case OP_BIT_AND:
1440 case OP_BIT_XOR:
1441 case OP_BIT_OR:
1442 case OP_CONCAT:
1443 case OP_SUBST:
1444 case OP_TRANS:
49e9fbe6
GS		 1445 case OP_READ:
1446 case OP_SYSREAD:
1447 case OP_RECV:
bf4b1e52
GS		 1448 case OP_ANDASSIGN:
1449 case OP_ORASSIGN:
3fe9a6f1 1450 return TRUE;
1451 default:
1452 return FALSE;
1453 }
1454}
1455
35cd451c 1456STATIC bool
cea2e8a9 1457S_is_handle_constructor(pTHX_ OP *o, I32 argnum)
35cd451c
GS		 1458{
1459 switch (o->op_type) {
1460 case OP_PIPE_OP:
1461 case OP_SOCKPAIR:
1462 if (argnum == 2)
1463 return TRUE;
1464 /* FALL THROUGH */
1465 case OP_SYSOPEN:
1466 case OP_OPEN:
ded8aa31 1467 case OP_SELECT: /* XXX c.f. SelectSaver.pm */
35cd451c
GS		 1468 case OP_SOCKET:
1469 case OP_OPEN_DIR:
1470 case OP_ACCEPT:
1471 if (argnum == 1)
1472 return TRUE;
1473 /* FALL THROUGH */
1474 default:
1475 return FALSE;
1476 }
1477}
1478
463ee0b2 1479OP *
864dbfa3 1480Perl_refkids(pTHX_ OP *o, I32 type)
463ee0b2
LW		 1481{
1482 OP *kid;
11343788
MB		 1483 if (o && o->op_flags & OPf_KIDS) {
1484 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1485 ref(kid, type);
1486 }
11343788 1487 return o;
463ee0b2
LW		 1488}
1489
1490OP *
864dbfa3 1491Perl_ref(pTHX_ OP *o, I32 type)
463ee0b2
LW		 1492{
1493 OP *kid;
463ee0b2 1494
3280af22 1495 if (!o || PL_error_count)
11343788 1496 return o;
463ee0b2 1497
11343788 1498 switch (o->op_type) {
a0d0e21e 1499 case OP_ENTERSUB:
e55aaa0e 1500 if ((type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1501 !(o->op_flags & OPf_STACKED)) {
1502 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1503 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788
MB		 1504 assert(cUNOPo->op_first->op_type == OP_NULL);
1505 null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
1506 o->op_flags |= OPf_SPECIAL;
8990e307
LW		 1507 }
1508 break;
aeea060c 1509
463ee0b2 1510 case OP_COND_EXPR:
11343788 1511 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2
LW		 1512 ref(kid, type);
1513 break;
8990e307 1514 case OP_RV2SV:
35cd451c
GS		 1515 if (type == OP_DEFINED)
1516 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1517 ref(cUNOPo->op_first, o->op_type);
4633a7c4
LW		 1518 /* FALL THROUGH */
1519 case OP_PADSV:
5f05dabc 1520 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1521 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1522 : type == OP_RV2HV ? OPpDEREF_HV
1523 : OPpDEREF_SV);
11343788 1524 o->op_flags |= OPf_MOD;
a0d0e21e 1525 }
8990e307
LW		 1526 break;
1527
2faa37cc 1528 case OP_THREADSV:
a863c7d1
MB		 1529 o->op_flags |= OPf_MOD; /* XXX ??? */
1530 break;
1531
463ee0b2
LW		 1532 case OP_RV2AV:
1533 case OP_RV2HV:
aeea060c 1534 o->op_flags |= OPf_REF;
8990e307 1535 /* FALL THROUGH */
463ee0b2 1536 case OP_RV2GV:
35cd451c
GS		 1537 if (type == OP_DEFINED)
1538 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1539 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1540 break;
8990e307 1541
463ee0b2
LW		 1542 case OP_PADAV:
1543 case OP_PADHV:
aeea060c 1544 o->op_flags |= OPf_REF;
79072805 1545 break;
aeea060c 1546
8990e307 1547 case OP_SCALAR:
79072805 1548 case OP_NULL:
11343788 1549 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1550 break;
11343788 1551 ref(cBINOPo->op_first, type);
79072805
LW		 1552 break;
1553 case OP_AELEM:
1554 case OP_HELEM:
11343788 1555 ref(cBINOPo->op_first, o->op_type);
5f05dabc 1556 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1557 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1558 : type == OP_RV2HV ? OPpDEREF_HV
1559 : OPpDEREF_SV);
11343788 1560 o->op_flags |= OPf_MOD;
8990e307 1561 }
79072805
LW		 1562 break;
1563
463ee0b2 1564 case OP_SCOPE:
79072805
LW		 1565 case OP_LEAVE:
1566 case OP_ENTER:
8990e307 1567 case OP_LIST:
11343788 1568 if (!(o->op_flags & OPf_KIDS))
79072805 1569 break;
11343788 1570 ref(cLISTOPo->op_last, type);
79072805 1571 break;
a0d0e21e
LW		 1572 default:
1573 break;
79072805 1574 }
11343788 1575 return scalar(o);
8990e307 1576
79072805
LW		 1577}
1578
1579OP *
864dbfa3 1580Perl_my(pTHX_ OP *o)
93a17b20
LW		 1581{
1582 OP *kid;
93a17b20
LW		 1583 I32 type;
1584
3280af22 1585 if (!o || PL_error_count)
11343788 1586 return o;
93a17b20 1587
11343788 1588 type = o->op_type;
93a17b20 1589 if (type == OP_LIST) {
11343788 1590 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
93a17b20 1591 my(kid);
dab48698 1592 } else if (type == OP_UNDEF) {
7766148a 1593 return o;
dab48698 1594 } else if (type != OP_PADSV &&
93a17b20
LW		 1595 type != OP_PADAV &&
1596 type != OP_PADHV &&
1597 type != OP_PUSHMARK)
1598 {
cea2e8a9 1599 yyerror(Perl_form(aTHX_ "Can't declare %s in my", PL_op_desc[o->op_type]));
11343788 1600 return o;
93a17b20 1601 }
11343788
MB		 1602 o->op_flags |= OPf_MOD;
1603 o->op_private |= OPpLVAL_INTRO;
1604 return o;
93a17b20
LW		 1605}
1606
1607OP *
864dbfa3 1608Perl_sawparens(pTHX_ OP *o)
79072805
LW		 1609{
1610 if (o)
1611 o->op_flags |= OPf_PARENS;
1612 return o;
1613}
1614
1615OP *
864dbfa3 1616Perl_bind_match(pTHX_ I32 type, OP *left, OP *right)
79072805 1617{
d008e5eb 1618 dTHR;
11343788 1619 OP *o;
79072805 1620
599cee73
PM		 1621 if (ckWARN(WARN_UNSAFE) &&
1622 (left->op_type == OP_RV2AV ||
1623 left->op_type == OP_RV2HV ||
1624 left->op_type == OP_PADAV ||
1625 left->op_type == OP_PADHV)) {
22c35a8c 1626 char *desc = PL_op_desc[(right->op_type == OP_SUBST ||
599cee73
PM		 1627 right->op_type == OP_TRANS)
1628 ? right->op_type : OP_MATCH];
1629 char *sample = ((left->op_type == OP_RV2AV ||
1630 left->op_type == OP_PADAV)
1631 ? "@array" : "%hash");
cea2e8a9 1632 Perl_warner(aTHX_ WARN_UNSAFE,
599cee73
PM		 1633 "Applying %s to %s will act on scalar(%s)",
1634 desc, sample, sample);
2ae324a7 1635 }
1636
79072805
LW		 1637 if (right->op_type == OP_MATCH ||
1638 right->op_type == OP_SUBST ||
1639 right->op_type == OP_TRANS) {
1640 right->op_flags |= OPf_STACKED;
1641 if (right->op_type != OP_MATCH)
463ee0b2 1642 left = mod(left, right->op_type);
79072805 1643 if (right->op_type == OP_TRANS)
11343788 1644 o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805 1645 else
11343788 1646 o = prepend_elem(right->op_type, scalar(left), right);
79072805 1647 if (type == OP_NOT)
11343788
MB		 1648 return newUNOP(OP_NOT, 0, scalar(o));
1649 return o;
79072805
LW		 1650 }
1651 else
1652 return bind_match(type, left,
1653 pmruntime(newPMOP(OP_MATCH, 0), right, Nullop));
1654}
1655
1656OP *
864dbfa3 1657Perl_invert(pTHX_ OP *o)
79072805 1658{
11343788
MB		 1659 if (!o)
1660 return o;
79072805 1661 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
11343788 1662 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1663}
1664
1665OP *
864dbfa3 1666Perl_scope(pTHX_ OP *o)
79072805
LW		 1667{
1668 if (o) {
3280af22 1669 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || PL_tainting) {
463ee0b2
LW		 1670 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1671 o->op_type = OP_LEAVE;
22c35a8c 1672 o->op_ppaddr = PL_ppaddr[OP_LEAVE];
463ee0b2
LW		 1673 }
1674 else {
1675 if (o->op_type == OP_LINESEQ) {
1676 OP *kid;
1677 o->op_type = OP_SCOPE;
22c35a8c 1678 o->op_ppaddr = PL_ppaddr[OP_SCOPE];
463ee0b2 1679 kid = ((LISTOP*)o)->op_first;
748a9306
LW		 1680 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE){
1681 SvREFCNT_dec(((COP*)kid)->cop_filegv);
8990e307 1682 null(kid);
748a9306 1683 }
463ee0b2
LW		 1684 }
1685 else
748a9306 1686 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
463ee0b2 1687 }
79072805
LW		 1688 }
1689 return o;
1690}
1691
b3ac6de7 1692void
864dbfa3 1693Perl_save_hints(pTHX)
b3ac6de7 1694{
3280af22
NIS		 1695 SAVEI32(PL_hints);
1696 SAVESPTR(GvHV(PL_hintgv));
1697 GvHV(PL_hintgv) = newHVhv(GvHV(PL_hintgv));
1698 SAVEFREESV(GvHV(PL_hintgv));
b3ac6de7
IZ		 1699}
1700
a0d0e21e 1701int
864dbfa3 1702Perl_block_start(pTHX_ int full)
79072805 1703{
11343788 1704 dTHR;
3280af22 1705 int retval = PL_savestack_ix;
b3ac6de7 1706
3280af22 1707 SAVEI32(PL_comppad_name_floor);
55497cff 1708 if (full) {
3280af22
NIS		 1709 if ((PL_comppad_name_fill = AvFILLp(PL_comppad_name)) > 0)
1710 PL_comppad_name_floor = PL_comppad_name_fill;
55497cff 1711 else
3280af22
NIS		 1712 PL_comppad_name_floor = 0;
1713 }
1714 SAVEI32(PL_min_intro_pending);
1715 SAVEI32(PL_max_intro_pending);
1716 PL_min_intro_pending = 0;
1717 SAVEI32(PL_comppad_name_fill);
1718 SAVEI32(PL_padix_floor);
1719 PL_padix_floor = PL_padix;
1720 PL_pad_reset_pending = FALSE;
b3ac6de7 1721 SAVEHINTS();
3280af22 1722 PL_hints &= ~HINT_BLOCK_SCOPE;
e24b16f9 1723 SAVEPPTR(PL_compiling.cop_warnings);
599cee73
PM		 1724 if (PL_compiling.cop_warnings != WARN_ALL &&
1725 PL_compiling.cop_warnings != WARN_NONE) {
1726 PL_compiling.cop_warnings = newSVsv(PL_compiling.cop_warnings) ;
1727 SAVEFREESV(PL_compiling.cop_warnings) ;
1728 }
1729
1730
a0d0e21e
LW		 1731 return retval;
1732}
1733
1734OP*
864dbfa3 1735Perl_block_end(pTHX_ I32 floor, OP *seq)
a0d0e21e 1736{
11343788 1737 dTHR;
3280af22 1738 int needblockscope = PL_hints & HINT_BLOCK_SCOPE;
a0d0e21e 1739 OP* retval = scalarseq(seq);
a0d0e21e 1740 LEAVE_SCOPE(floor);
3280af22 1741 PL_pad_reset_pending = FALSE;
e24b16f9 1742 PL_compiling.op_private = PL_hints;
a0d0e21e 1743 if (needblockscope)
3280af22
NIS		 1744 PL_hints |= HINT_BLOCK_SCOPE; /* propagate out */
1745 pad_leavemy(PL_comppad_name_fill);
1746 PL_cop_seqmax++;
a0d0e21e
LW		 1747 return retval;
1748}
1749
76e3520e 1750STATIC OP *
cea2e8a9 1751S_newDEFSVOP(pTHX)
54b9620d
MB		 1752{
1753#ifdef USE_THREADS
1754 OP *o = newOP(OP_THREADSV, 0);
1755 o->op_targ = find_threadsv("_");
1756 return o;
1757#else
3280af22 1758 return newSVREF(newGVOP(OP_GV, 0, PL_defgv));
54b9620d
MB		 1759#endif /* USE_THREADS */
1760}
1761
a0d0e21e 1762void
864dbfa3 1763Perl_newPROG(pTHX_ OP *o)
a0d0e21e 1764{
11343788 1765 dTHR;
3280af22 1766 if (PL_in_eval) {
b295d113
TH		 1767 if (PL_eval_root)
1768 return;
faef0170
HS		 1769 PL_eval_root = newUNOP(OP_LEAVEEVAL,
1770 ((PL_in_eval & EVAL_KEEPERR)
1771 ? OPf_SPECIAL : 0), o);
3280af22
NIS		 1772 PL_eval_start = linklist(PL_eval_root);
1773 PL_eval_root->op_next = 0;
1774 peep(PL_eval_start);
a0d0e21e
LW		 1775 }
1776 else {
5dc0d613 1777 if (!o)
a0d0e21e 1778 return;
3280af22
NIS		 1779 PL_main_root = scope(sawparens(scalarvoid(o)));
1780 PL_curcop = &PL_compiling;
1781 PL_main_start = LINKLIST(PL_main_root);
1782 PL_main_root->op_next = 0;
1783 peep(PL_main_start);
1784 PL_compcv = 0;
3841441e 1785
4fdae800 1786 /* Register with debugger */
84902520 1787 if (PERLDB_INTER) {
864dbfa3 1788 CV *cv = get_cv("DB::postponed", FALSE);
3841441e
CS		 1789 if (cv) {
1790 dSP;
924508f0 1791 PUSHMARK(SP);
3280af22 1792 XPUSHs((SV*)PL_compiling.cop_filegv);
3841441e 1793 PUTBACK;
864dbfa3 1794 call_sv((SV*)cv, G_DISCARD);
3841441e
CS		 1795 }
1796 }
79072805 1797 }
79072805
LW		 1798}
1799
1800OP *
864dbfa3 1801Perl_localize(pTHX_ OP *o, I32 lex)
79072805
LW		 1802{
1803 if (o->op_flags & OPf_PARENS)
1804 list(o);
8990e307 1805 else {
d008e5eb 1806 dTHR;
599cee73 1807 if (ckWARN(WARN_PARENTHESIS) && PL_bufptr > PL_oldbufptr && PL_bufptr[-1] == ',') {
8990e307 1808 char *s;
834a4ddd 1809 for (s = PL_bufptr; *s && (isALNUM(*s) || (*s & 0x80) || strchr("@$%, ",*s)); s++) ;
a0d0e21e 1810 if (*s == ';' || *s == '=')
cea2e8a9 1811 Perl_warner(aTHX_ WARN_PARENTHESIS, "Parentheses missing around \"%s\" list",
599cee73 1812 lex ? "my" : "local");
8990e307
LW		 1813 }
1814 }
3280af22
NIS		 1815 PL_in_my = FALSE;
1816 PL_in_my_stash = Nullhv;
93a17b20
LW		 1817 if (lex)
1818 return my(o);
1819 else
463ee0b2 1820 return mod(o, OP_NULL); /* a bit kludgey */
79072805
LW		 1821}
1822
1823OP *
864dbfa3 1824Perl_jmaybe(pTHX_ OP *o)
79072805
LW		 1825{
1826 if (o->op_type == OP_LIST) {
554b3eca
MB		 1827 OP *o2;
1828#ifdef USE_THREADS
2faa37cc 1829 o2 = newOP(OP_THREADSV, 0);
54b9620d 1830 o2->op_targ = find_threadsv(";");
554b3eca
MB		 1831#else
1832 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
1833#endif /* USE_THREADS */
1834 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 1835 }
1836 return o;
1837}
1838
1839OP *
864dbfa3 1840Perl_fold_constants(pTHX_ register OP *o)
79072805 1841{
11343788 1842 dTHR;
79072805
LW		 1843 register OP *curop;
1844 I32 type = o->op_type;
748a9306 1845 SV *sv;
79072805 1846
22c35a8c 1847 if (PL_opargs[type] & OA_RETSCALAR)
79072805 1848 scalar(o);
b162f9ea 1849 if (PL_opargs[type] & OA_TARGET && !o->op_targ)
ed6116ce 1850 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 1851
eac055e9
GS		 1852 /* integerize op, unless it happens to be C<-foo>.
1853 * XXX should pp_i_negate() do magic string negation instead? */
1854 if ((PL_opargs[type] & OA_OTHERINT) && (PL_hints & HINT_INTEGER)
1855 && !(type == OP_NEGATE && cUNOPo->op_first->op_type == OP_CONST
1856 && (cUNOPo->op_first->op_private & OPpCONST_BARE)))
1857 {
22c35a8c 1858 o->op_ppaddr = PL_ppaddr[type = ++(o->op_type)];
eac055e9 1859 }
85e6fe83 1860
22c35a8c 1861 if (!(PL_opargs[type] & OA_FOLDCONST))
79072805
LW		 1862 goto nope;
1863
de939608 1864 switch (type) {
7a52d87a
GS		 1865 case OP_NEGATE:
1866 /* XXX might want a ck_negate() for this */
1867 cUNOPo->op_first->op_private &= ~OPpCONST_STRICT;
1868 break;
de939608
CS		 1869 case OP_SPRINTF:
1870 case OP_UCFIRST:
1871 case OP_LCFIRST:
1872 case OP_UC:
1873 case OP_LC:
69dcf70c
MB		 1874 case OP_SLT:
1875 case OP_SGT:
1876 case OP_SLE:
1877 case OP_SGE:
1878 case OP_SCMP:
1879
de939608
CS		 1880 if (o->op_private & OPpLOCALE)
1881 goto nope;
1882 }
1883
3280af22 1884 if (PL_error_count)
a0d0e21e
LW		 1885 goto nope; /* Don't try to run w/ errors */
1886
79072805 1887 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
93a17b20 1888 if (curop->op_type != OP_CONST &&
7a52d87a
GS		 1889 curop->op_type != OP_LIST &&
1890 curop->op_type != OP_SCALAR &&
1891 curop->op_type != OP_NULL &&
1892 curop->op_type != OP_PUSHMARK)
1893 {
79072805
LW		 1894 goto nope;
1895 }
1896 }
1897
1898 curop = LINKLIST(o);
1899 o->op_next = 0;
533c011a 1900 PL_op = curop;
cea2e8a9 1901 CALLRUNOPS(aTHX);
3280af22 1902 sv = *(PL_stack_sp--);
748a9306 1903 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
79072805 1904 pad_swipe(o->op_targ);
748a9306
LW		 1905 else if (SvTEMP(sv)) { /* grab mortal temp? */
1906 (void)SvREFCNT_inc(sv);
1907 SvTEMP_off(sv);
85e6fe83 1908 }
79072805
LW		 1909 op_free(o);
1910 if (type == OP_RV2GV)
b1cb66bf 1911 return newGVOP(OP_GV, 0, (GV*)sv);
748a9306 1912 else {
ee580363
GS		 1913 /* try to smush double to int, but don't smush -2.0 to -2 */
1914 if ((SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK)) == SVf_NOK &&
1915 type != OP_NEGATE)
1916 {
748a9306 1917 IV iv = SvIV(sv);
65202027 1918 if ((NV)iv == SvNV(sv)) {
748a9306
LW		 1919 SvREFCNT_dec(sv);
1920 sv = newSViv(iv);
1921 }
b1cb66bf 1922 else
1923 SvIOK_off(sv); /* undo SvIV() damage */
748a9306
LW		 1924 }
1925 return newSVOP(OP_CONST, 0, sv);
1926 }
aeea060c 1927
79072805 1928 nope:
22c35a8c 1929 if (!(PL_opargs[type] & OA_OTHERINT))
79072805 1930 return o;
79072805 1931
3280af22 1932 if (!(PL_hints & HINT_INTEGER)) {
a0d0e21e 1933 if (type == OP_DIVIDE || !(o->op_flags & OPf_KIDS))
85e6fe83
LW		 1934 return o;
1935
1936 for (curop = ((UNOP*)o)->op_first; curop; curop = curop->op_sibling) {
1937 if (curop->op_type == OP_CONST) {
b1cb66bf 1938 if (SvIOK(((SVOP*)curop)->op_sv))
85e6fe83
LW		 1939 continue;
1940 return o;
1941 }
22c35a8c 1942 if (PL_opargs[curop->op_type] & OA_RETINTEGER)
79072805
LW		 1943 continue;
1944 return o;
1945 }
22c35a8c 1946 o->op_ppaddr = PL_ppaddr[++(o->op_type)];
79072805
LW		 1947 }
1948
79072805
LW		 1949 return o;
1950}
1951
1952OP *
864dbfa3 1953Perl_gen_constant_list(pTHX_ register OP *o)
79072805 1954{
11343788 1955 dTHR;
79072805 1956 register OP *curop;
3280af22 1957 I32 oldtmps_floor = PL_tmps_floor;
79072805 1958
a0d0e21e 1959 list(o);
3280af22 1960 if (PL_error_count)
a0d0e21e
LW		 1961 return o; /* Don't attempt to run with errors */
1962
533c011a 1963 PL_op = curop = LINKLIST(o);
a0d0e21e 1964 o->op_next = 0;
cea2e8a9
GS		 1965 pp_pushmark();
1966 CALLRUNOPS(aTHX);
533c011a 1967 PL_op = curop;
cea2e8a9 1968 pp_anonlist();
3280af22 1969 PL_tmps_floor = oldtmps_floor;
79072805
LW		 1970
1971 o->op_type = OP_RV2AV;
22c35a8c 1972 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
79072805 1973 curop = ((UNOP*)o)->op_first;
3280af22 1974 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*PL_stack_sp--));
79072805 1975 op_free(curop);
79072805
LW		 1976 linklist(o);
1977 return list(o);
1978}
1979
1980OP *
864dbfa3 1981Perl_convert(pTHX_ I32 type, I32 flags, OP *o)
79072805
LW		 1982{
1983 OP *kid;
a0d0e21e 1984 OP *last = 0;
79072805 1985
11343788
MB		 1986 if (!o || o->op_type != OP_LIST)
1987 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 1988 else
5dc0d613 1989 o->op_flags &= ~OPf_WANT;
79072805 1990
22c35a8c 1991 if (!(PL_opargs[type] & OA_MARK))
11343788 1992 null(cLISTOPo->op_first);
8990e307 1993
11343788 1994 o->op_type = type;
22c35a8c 1995 o->op_ppaddr = PL_ppaddr[type];
11343788 1996 o->op_flags |= flags;
79072805 1997
11343788
MB		 1998 o = CHECKOP(type, o);
1999 if (o->op_type != type)
2000 return o;
79072805 2001
11343788 2002 if (cLISTOPo->op_children < 7) {
79072805 2003 /* XXX do we really need to do this if we're done appending?? */
11343788 2004 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805 2005 last = kid;
11343788 2006 cLISTOPo->op_last = last; /* in case check substituted last arg */
79072805
LW		 2007 }
2008
11343788 2009 return fold_constants(o);
79072805
LW		 2010}
2011
2012/* List constructors */
2013
2014OP *
864dbfa3 2015Perl_append_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2016{
2017 if (!first)
2018 return last;
8990e307
LW		 2019
2020 if (!last)
79072805 2021 return first;
8990e307 2022
a0d0e21e
LW		 2023 if (first->op_type != type || type==OP_LIST && first->op_flags & OPf_PARENS)
2024 return newLISTOP(type, 0, first, last);
79072805 2025
a0d0e21e
LW		 2026 if (first->op_flags & OPf_KIDS)
2027 ((LISTOP*)first)->op_last->op_sibling = last;
2028 else {
2029 first->op_flags |= OPf_KIDS;
2030 ((LISTOP*)first)->op_first = last;
2031 }
2032 ((LISTOP*)first)->op_last = last;
2033 ((LISTOP*)first)->op_children++;
2034 return first;
79072805
LW		 2035}
2036
2037OP *
864dbfa3 2038Perl_append_list(pTHX_ I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 2039{
2040 if (!first)
2041 return (OP*)last;
8990e307
LW		 2042
2043 if (!last)
79072805 2044 return (OP*)first;
8990e307
LW		 2045
2046 if (first->op_type != type)
79072805 2047 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307
LW		 2048
2049 if (last->op_type != type)
79072805
LW		 2050 return append_elem(type, (OP*)first, (OP*)last);
2051
2052 first->op_last->op_sibling = last->op_first;
2053 first->op_last = last->op_last;
2054 first->op_children += last->op_children;
2055 if (first->op_children)
acb74605 2056 first->op_flags |= OPf_KIDS;
b7dc083c
NIS		 2057
2058#ifdef PL_OP_SLAB_ALLOC
2059#else
2060 Safefree(last);
2061#endif
79072805
LW		 2062 return (OP*)first;
2063}
2064
2065OP *
864dbfa3 2066Perl_prepend_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2067{
2068 if (!first)
2069 return last;
8990e307
LW		 2070
2071 if (!last)
79072805 2072 return first;
8990e307
LW		 2073
2074 if (last->op_type == type) {
2075 if (type == OP_LIST) { /* already a PUSHMARK there */
2076 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
2077 ((LISTOP*)last)->op_first->op_sibling = first;
2078 }
2079 else {
2080 if (!(last->op_flags & OPf_KIDS)) {
2081 ((LISTOP*)last)->op_last = first;
2082 last->op_flags |= OPf_KIDS;
2083 }
2084 first->op_sibling = ((LISTOP*)last)->op_first;
2085 ((LISTOP*)last)->op_first = first;
79072805 2086 }
79072805
LW		 2087 ((LISTOP*)last)->op_children++;
2088 return last;
2089 }
2090
2091 return newLISTOP(type, 0, first, last);
2092}
2093
2094/* Constructors */
2095
2096OP *
864dbfa3 2097Perl_newNULLLIST(pTHX)
79072805 2098{
8990e307
LW		 2099 return newOP(OP_STUB, 0);
2100}
2101
2102OP *
864dbfa3 2103Perl_force_list(pTHX_ OP *o)
8990e307 2104{
11343788
MB		 2105 if (!o || o->op_type != OP_LIST)
2106 o = newLISTOP(OP_LIST, 0, o, Nullop);
2107 null(o);
2108 return o;
79072805
LW		 2109}
2110
2111OP *
864dbfa3 2112Perl_newLISTOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2113{
2114 LISTOP *listop;
2115
b7dc083c 2116 NewOp(1101, listop, 1, LISTOP);
79072805
LW		 2117
2118 listop->op_type = type;
22c35a8c 2119 listop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2120 listop->op_children = (first != 0) + (last != 0);
2121 listop->op_flags = flags;
79072805
LW		 2122
2123 if (!last && first)
2124 last = first;
2125 else if (!first && last)
2126 first = last;
8990e307
LW		 2127 else if (first)
2128 first->op_sibling = last;
79072805
LW		 2129 listop->op_first = first;
2130 listop->op_last = last;
8990e307
LW		 2131 if (type == OP_LIST) {
2132 OP* pushop;
2133 pushop = newOP(OP_PUSHMARK, 0);
2134 pushop->op_sibling = first;
2135 listop->op_first = pushop;
2136 listop->op_flags |= OPf_KIDS;
2137 if (!last)
2138 listop->op_last = pushop;
2139 }
2140 else if (listop->op_children)
2141 listop->op_flags |= OPf_KIDS;
79072805
LW		 2142
2143 return (OP*)listop;
2144}
2145
2146OP *
864dbfa3 2147Perl_newOP(pTHX_ I32 type, I32 flags)
79072805 2148{
11343788 2149 OP *o;
b7dc083c 2150 NewOp(1101, o, 1, OP);
11343788 2151 o->op_type = type;
22c35a8c 2152 o->op_ppaddr = PL_ppaddr[type];
11343788 2153 o->op_flags = flags;
79072805 2154
11343788
MB		 2155 o->op_next = o;
2156 o->op_private = 0 + (flags >> 8);
22c35a8c 2157 if (PL_opargs[type] & OA_RETSCALAR)
11343788 2158 scalar(o);
22c35a8c 2159 if (PL_opargs[type] & OA_TARGET)
11343788
MB		 2160 o->op_targ = pad_alloc(type, SVs_PADTMP);
2161 return CHECKOP(type, o);
79072805
LW		 2162}
2163
2164OP *
864dbfa3 2165Perl_newUNOP(pTHX_ I32 type, I32 flags, OP *first)
79072805
LW		 2166{
2167 UNOP *unop;
2168
93a17b20 2169 if (!first)
aeea060c 2170 first = newOP(OP_STUB, 0);
22c35a8c 2171 if (PL_opargs[type] & OA_MARK)
8990e307 2172 first = force_list(first);
93a17b20 2173
b7dc083c 2174 NewOp(1101, unop, 1, UNOP);
79072805 2175 unop->op_type = type;
22c35a8c 2176 unop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2177 unop->op_first = first;
2178 unop->op_flags = flags | OPf_KIDS;
c07a80fd 2179 unop->op_private = 1 | (flags >> 8);
e50aee73 2180 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 2181 if (unop->op_next)
2182 return (OP*)unop;
2183
a0d0e21e 2184 return fold_constants((OP *) unop);
79072805
LW		 2185}
2186
2187OP *
864dbfa3 2188Perl_newBINOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2189{
2190 BINOP *binop;
b7dc083c 2191 NewOp(1101, binop, 1, BINOP);
79072805
LW		 2192
2193 if (!first)
2194 first = newOP(OP_NULL, 0);
2195
2196 binop->op_type = type;
22c35a8c 2197 binop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2198 binop->op_first = first;
2199 binop->op_flags = flags | OPf_KIDS;
2200 if (!last) {
2201 last = first;
c07a80fd 2202 binop->op_private = 1 | (flags >> 8);
79072805
LW		 2203 }
2204 else {
c07a80fd 2205 binop->op_private = 2 | (flags >> 8);
79072805
LW		 2206 first->op_sibling = last;
2207 }
2208
e50aee73 2209 binop = (BINOP*)CHECKOP(type, binop);
b162f9ea 2210 if (binop->op_next || binop->op_type != type)
79072805
LW		 2211 return (OP*)binop;
2212
7284ab6f 2213 binop->op_last = binop->op_first->op_sibling;
79072805 2214
a0d0e21e 2215 return fold_constants((OP *)binop);
79072805
LW		 2216}
2217
a0ed51b3
LW		 2218static int
2219utf8compare(const void *a, const void *b)
2220{
2221 int i;
2222 for (i = 0; i < 10; i++) {
2223 if ((*(U8**)a)[i] < (*(U8**)b)[i])
2224 return -1;
2225 if ((*(U8**)a)[i] > (*(U8**)b)[i])
2226 return 1;
2227 }
2228 return 0;
2229}
2230
79072805 2231OP *
864dbfa3 2232Perl_pmtrans(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2233{
79072805
LW		 2234 SV *tstr = ((SVOP*)expr)->op_sv;
2235 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 2236 STRLEN tlen;
2237 STRLEN rlen;
ec49126f 2238 register U8 *t = (U8*)SvPV(tstr, tlen);
2239 register U8 *r = (U8*)SvPV(rstr, rlen);
79072805
LW		 2240 register I32 i;
2241 register I32 j;
a0ed51b3 2242 I32 del;
79072805 2243 I32 complement;
5d06d08e 2244 I32 squash;
79072805
LW		 2245 register short *tbl;
2246
11343788 2247 complement = o->op_private & OPpTRANS_COMPLEMENT;
a0ed51b3 2248 del = o->op_private & OPpTRANS_DELETE;
5d06d08e 2249 squash = o->op_private & OPpTRANS_SQUASH;
79072805 2250
a0ed51b3 2251 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
79cb57f6 2252 SV* listsv = newSVpvn("# comment\n",10);
a0ed51b3
LW		 2253 SV* transv = 0;
2254 U8* tend = t + tlen;
2255 U8* rend = r + rlen;
2256 I32 ulen;
2257 U32 tfirst = 1;
2258 U32 tlast = 0;
2259 I32 tdiff;
2260 U32 rfirst = 1;
2261 U32 rlast = 0;
2262 I32 rdiff;
2263 I32 diff;
2264 I32 none = 0;
2265 U32 max = 0;
2266 I32 bits;
2267 I32 grows = 0;
2268 I32 havefinal = 0;
2269 U32 final;
2270 HV *hv;
2271 I32 from_utf = o->op_private & OPpTRANS_FROM_UTF;
2272 I32 to_utf = o->op_private & OPpTRANS_TO_UTF;
2273
2274 if (complement) {
2275 U8 tmpbuf[10];
2276 U8** cp;
2277 UV nextmin = 0;
2278 New(1109, cp, tlen, U8*);
2279 i = 0;
79cb57f6 2280 transv = newSVpvn("",0);
a0ed51b3
LW		 2281 while (t < tend) {
2282 cp[i++] = t;
2283 t += UTF8SKIP(t);
2284 if (*t == 0xff) {
2285 t++;
2286 t += UTF8SKIP(t);
2287 }
2288 }
2289 qsort(cp, i, sizeof(U8*), utf8compare);
2290 for (j = 0; j < i; j++) {
2291 U8 *s = cp[j];
2292 UV val = utf8_to_uv(s, &ulen);
2293 s += ulen;
2294 diff = val - nextmin;
2295 if (diff > 0) {
2296 t = uv_to_utf8(tmpbuf,nextmin);
dfe13c55 2297 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2298 if (diff > 1) {
2299 t = uv_to_utf8(tmpbuf, val - 1);
2300 sv_catpvn(transv, "\377", 1);
dfe13c55 2301 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2302 }
2303 }
2304 if (*s == 0xff)
2305 val = utf8_to_uv(s+1, &ulen);
2306 if (val >= nextmin)
2307 nextmin = val + 1;
2308 }
2309 t = uv_to_utf8(tmpbuf,nextmin);
dfe13c55 2310 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2311 t = uv_to_utf8(tmpbuf, 0x7fffffff);
2312 sv_catpvn(transv, "\377", 1);
dfe13c55
GS		 2313 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
2314 t = (U8*)SvPVX(transv);
a0ed51b3
LW		 2315 tlen = SvCUR(transv);
2316 tend = t + tlen;
2317 }
2318 else if (!rlen && !del) {
2319 r = t; rlen = tlen; rend = tend;
4757a243
LW		 2320 }
2321 if (!squash) {
2322 if (to_utf && from_utf) { /* only counting characters */
2323 if (t == r || (tlen == rlen && memEQ(t, r, tlen)))
2324 o->op_private |= OPpTRANS_IDENTICAL;
2325 }
2326 else { /* straight latin-1 translation */
2327 if (tlen == 4 && memEQ(t, "\0\377\303\277", 4) &&
2328 rlen == 4 && memEQ(r, "\0\377\303\277", 4))
2329 o->op_private |= OPpTRANS_IDENTICAL;
2330 }
a0ed51b3
LW		 2331 }
2332
2333 while (t < tend || tfirst <= tlast) {
2334 /* see if we need more "t" chars */
2335 if (tfirst > tlast) {
2336 tfirst = (I32)utf8_to_uv(t, &ulen);
2337 t += ulen;
2338 if (t < tend && *t == 0xff) { /* illegal utf8 val indicates range */
2339 tlast = (I32)utf8_to_uv(++t, &ulen);
2340 t += ulen;
2341 }
2342 else
2343 tlast = tfirst;
2344 }
2345
2346 /* now see if we need more "r" chars */
2347 if (rfirst > rlast) {
2348 if (r < rend) {
2349 rfirst = (I32)utf8_to_uv(r, &ulen);
2350 r += ulen;
2351 if (r < rend && *r == 0xff) { /* illegal utf8 val indicates range */
2352 rlast = (I32)utf8_to_uv(++r, &ulen);
2353 r += ulen;
2354 }
2355 else
2356 rlast = rfirst;
2357 }
2358 else {
2359 if (!havefinal++)
2360 final = rlast;
2361 rfirst = rlast = 0xffffffff;
2362 }
2363 }
2364
2365 /* now see which range will peter our first, if either. */
2366 tdiff = tlast - tfirst;
2367 rdiff = rlast - rfirst;
2368
2369 if (tdiff <= rdiff)
2370 diff = tdiff;
2371 else
2372 diff = rdiff;
2373
2374 if (rfirst == 0xffffffff) {
2375 diff = tdiff; /* oops, pretend rdiff is infinite */
2376 if (diff > 0)
cea2e8a9 2377 Perl_sv_catpvf(aTHX_ listsv, "%04x\t%04x\tXXXX\n", tfirst, tlast);
a0ed51b3 2378 else
cea2e8a9 2379 Perl_sv_catpvf(aTHX_ listsv, "%04x\t\tXXXX\n", tfirst);
a0ed51b3
LW		 2380 }
2381 else {
2382 if (diff > 0)
cea2e8a9 2383 Perl_sv_catpvf(aTHX_ listsv, "%04x\t%04x\t%04x\n", tfirst, tfirst + diff, rfirst);
a0ed51b3 2384 else
cea2e8a9 2385 Perl_sv_catpvf(aTHX_ listsv, "%04x\t\t%04x\n", tfirst, rfirst);
a0ed51b3
LW		 2386
2387 if (rfirst + diff > max)
2388 max = rfirst + diff;
2389 rfirst += diff + 1;
2390 if (!grows) {
2391 if (rfirst <= 0x80)
2392 ;
2393 else if (rfirst <= 0x800)
2394 grows |= (tfirst < 0x80);
2395 else if (rfirst <= 0x10000)
2396 grows |= (tfirst < 0x800);
2397 else if (rfirst <= 0x200000)
2398 grows |= (tfirst < 0x10000);
2399 else if (rfirst <= 0x4000000)
2400 grows |= (tfirst < 0x200000);
2401 else if (rfirst <= 0x80000000)
2402 grows |= (tfirst < 0x4000000);
2403 }
2404 }
2405 tfirst += diff + 1;
2406 }
2407
2408 none = ++max;
2409 if (del)
2410 del = ++max;
2411
2412 if (max > 0xffff)
2413 bits = 32;
2414 else if (max > 0xff)
2415 bits = 16;
2416 else
2417 bits = 8;
2418
2419 cSVOPo->op_sv = (SV*)swash_init("utf8", "", listsv, bits, none);
2420 SvREFCNT_dec(listsv);
2421 if (transv)
2422 SvREFCNT_dec(transv);
2423
2424 if (!del && havefinal)
2425 (void)hv_store((HV*)SvRV((cSVOPo->op_sv)), "FINAL", 5, newSViv((IV)final), 0);
2426
2427 if (grows && to_utf)
2428 o->op_private |= OPpTRANS_GROWS;
2429
2430 op_free(expr);
2431 op_free(repl);
2432 return o;
2433 }
2434
2435 tbl = (short*)cPVOPo->op_pv;
79072805
LW		 2436 if (complement) {
2437 Zero(tbl, 256, short);
2438 for (i = 0; i < tlen; i++)
ec49126f 2439 tbl[t[i]] = -1;
79072805
LW		 2440 for (i = 0, j = 0; i < 256; i++) {
2441 if (!tbl[i]) {
2442 if (j >= rlen) {
a0ed51b3 2443 if (del)
79072805
LW		 2444 tbl[i] = -2;
2445 else if (rlen)
ec49126f 2446 tbl[i] = r[j-1];
79072805
LW		 2447 else
2448 tbl[i] = i;
2449 }
2450 else
ec49126f 2451 tbl[i] = r[j++];
79072805
LW		 2452 }
2453 }
2454 }
2455 else {
a0ed51b3 2456 if (!rlen && !del) {
79072805 2457 r = t; rlen = tlen;
5d06d08e 2458 if (!squash)
4757a243 2459 o->op_private |= OPpTRANS_IDENTICAL;
79072805
LW		 2460 }
2461 for (i = 0; i < 256; i++)
2462 tbl[i] = -1;
2463 for (i = 0, j = 0; i < tlen; i++,j++) {
2464 if (j >= rlen) {
a0ed51b3 2465 if (del) {
ec49126f 2466 if (tbl[t[i]] == -1)
2467 tbl[t[i]] = -2;
79072805
LW		 2468 continue;
2469 }
2470 --j;
2471 }
ec49126f 2472 if (tbl[t[i]] == -1)
2473 tbl[t[i]] = r[j];
79072805
LW		 2474 }
2475 }
2476 op_free(expr);
2477 op_free(repl);
2478
11343788 2479 return o;
79072805
LW		 2480}
2481
2482OP *
864dbfa3 2483Perl_newPMOP(pTHX_ I32 type, I32 flags)
79072805 2484{
11343788 2485 dTHR;
79072805
LW		 2486 PMOP *pmop;
2487
b7dc083c 2488 NewOp(1101, pmop, 1, PMOP);
79072805 2489 pmop->op_type = type;
22c35a8c 2490 pmop->op_ppaddr = PL_ppaddr[type];
79072805 2491 pmop->op_flags = flags;
c07a80fd 2492 pmop->op_private = 0 | (flags >> 8);
79072805 2493
3280af22 2494 if (PL_hints & HINT_RE_TAINT)
b3eb6a9b 2495 pmop->op_pmpermflags |= PMf_RETAINT;
3280af22 2496 if (PL_hints & HINT_LOCALE)
b3eb6a9b
GS		 2497 pmop->op_pmpermflags |= PMf_LOCALE;
2498 pmop->op_pmflags = pmop->op_pmpermflags;
36477c24 2499
79072805 2500 /* link into pm list */
3280af22
NIS		 2501 if (type != OP_TRANS && PL_curstash) {
2502 pmop->op_pmnext = HvPMROOT(PL_curstash);
2503 HvPMROOT(PL_curstash) = pmop;
79072805
LW		 2504 }
2505
2506 return (OP*)pmop;
2507}
2508
2509OP *
864dbfa3 2510Perl_pmruntime(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2511{
5c0ca799 2512 dTHR;
79072805
LW		 2513 PMOP *pm;
2514 LOGOP *rcop;
ce862d02 2515 I32 repl_has_vars = 0;
79072805 2516
11343788
MB		 2517 if (o->op_type == OP_TRANS)
2518 return pmtrans(o, expr, repl);
79072805 2519
3280af22 2520 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2521 pm = (PMOP*)o;
79072805
LW		 2522
2523 if (expr->op_type == OP_CONST) {
463ee0b2 2524 STRLEN plen;
79072805 2525 SV *pat = ((SVOP*)expr)->op_sv;
463ee0b2 2526 char *p = SvPV(pat, plen);
11343788 2527 if ((o->op_flags & OPf_SPECIAL) && strEQ(p, " ")) {
93a17b20 2528 sv_setpvn(pat, "\\s+", 3);
463ee0b2 2529 p = SvPV(pat, plen);
79072805
LW		 2530 pm->op_pmflags |= PMf_SKIPWHITE;
2531 }
cea2e8a9 2532 pm->op_pmregexp = CALLREGCOMP(aTHX_ p, p + plen, pm);
aeea060c 2533 if (strEQ("\\s+", pm->op_pmregexp->precomp))
85e6fe83 2534 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2535 op_free(expr);
2536 }
2537 else {
3280af22
NIS		 2538 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL))
2539 expr = newUNOP((!(PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2540 ? OP_REGCRESET
2541 : OP_REGCMAYBE),0,expr);
463ee0b2 2542
b7dc083c 2543 NewOp(1101, rcop, 1, LOGOP);
79072805 2544 rcop->op_type = OP_REGCOMP;
22c35a8c 2545 rcop->op_ppaddr = PL_ppaddr[OP_REGCOMP];
79072805 2546 rcop->op_first = scalar(expr);
3280af22 2547 rcop->op_flags |= ((PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2548 ? (OPf_SPECIAL | OPf_KIDS)
2549 : OPf_KIDS);
79072805 2550 rcop->op_private = 1;
11343788 2551 rcop->op_other = o;
79072805
LW		 2552
2553 /* establish postfix order */
3280af22 2554 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL)) {
463ee0b2
LW		 2555 LINKLIST(expr);
2556 rcop->op_next = expr;
2557 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2558 }
2559 else {
2560 rcop->op_next = LINKLIST(expr);
2561 expr->op_next = (OP*)rcop;
2562 }
79072805 2563
11343788 2564 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2565 }
2566
2567 if (repl) {
748a9306 2568 OP *curop;
0244c3a4 2569 if (pm->op_pmflags & PMf_EVAL) {
748a9306 2570 curop = 0;
0244c3a4
GS		 2571 if (PL_curcop->cop_line < PL_multi_end)
2572 PL_curcop->cop_line = PL_multi_end;
2573 }
554b3eca 2574#ifdef USE_THREADS
2faa37cc 2575 else if (repl->op_type == OP_THREADSV
554b3eca 2576 && strchr("&`'123456789+",
533c011a 2577 PL_threadsv_names[repl->op_targ]))
554b3eca
MB		 2578 {
2579 curop = 0;
2580 }
2581#endif /* USE_THREADS */
748a9306
LW		 2582 else if (repl->op_type == OP_CONST)
2583 curop = repl;
79072805 2584 else {
79072805
LW		 2585 OP *lastop = 0;
2586 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
22c35a8c 2587 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
554b3eca 2588#ifdef USE_THREADS
ce862d02
IZ		 2589 if (curop->op_type == OP_THREADSV) {
2590 repl_has_vars = 1;
be949f6f 2591 if (strchr("&`'123456789+", curop->op_private))
ce862d02 2592 break;
554b3eca
MB		 2593 }
2594#else
79072805
LW		 2595 if (curop->op_type == OP_GV) {
2596 GV *gv = ((GVOP*)curop)->op_gv;
ce862d02 2597 repl_has_vars = 1;
93a17b20 2598 if (strchr("&`'123456789+", *GvENAME(gv)))
79072805
LW		 2599 break;
2600 }
554b3eca 2601#endif /* USE_THREADS */
79072805
LW		 2602 else if (curop->op_type == OP_RV2CV)
2603 break;
2604 else if (curop->op_type == OP_RV2SV ||
2605 curop->op_type == OP_RV2AV ||
2606 curop->op_type == OP_RV2HV ||
2607 curop->op_type == OP_RV2GV) {
2608 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2609 break;
2610 }
748a9306
LW		 2611 else if (curop->op_type == OP_PADSV ||
2612 curop->op_type == OP_PADAV ||
2613 curop->op_type == OP_PADHV ||
554b3eca 2614 curop->op_type == OP_PADANY) {
ce862d02 2615 repl_has_vars = 1;
748a9306 2616 }
1167e5da
SM		 2617 else if (curop->op_type == OP_PUSHRE)
2618 ; /* Okay here, dangerous in newASSIGNOP */
79072805
LW		 2619 else
2620 break;
2621 }
2622 lastop = curop;
2623 }
748a9306 2624 }
ce862d02
IZ		 2625 if (curop == repl
2626 && !(repl_has_vars
2627 && (!pm->op_pmregexp
2628 || pm->op_pmregexp->reganch & ROPT_EVAL_SEEN))) {
748a9306 2629 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2630 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2631 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2632 }
2633 else {
ce862d02
IZ		 2634 if (curop == repl && !pm->op_pmregexp) { /* Has variables. */
2635 pm->op_pmflags |= PMf_MAYBE_CONST;
2636 pm->op_pmpermflags |= PMf_MAYBE_CONST;
2637 }
b7dc083c 2638 NewOp(1101, rcop, 1, LOGOP);
748a9306 2639 rcop->op_type = OP_SUBSTCONT;
22c35a8c 2640 rcop->op_ppaddr = PL_ppaddr[OP_SUBSTCONT];
748a9306
LW		 2641 rcop->op_first = scalar(repl);
2642 rcop->op_flags |= OPf_KIDS;
2643 rcop->op_private = 1;
11343788 2644 rcop->op_other = o;
748a9306
LW		 2645
2646 /* establish postfix order */
2647 rcop->op_next = LINKLIST(repl);
2648 repl->op_next = (OP*)rcop;
2649
2650 pm->op_pmreplroot = scalar((OP*)rcop);
2651 pm->op_pmreplstart = LINKLIST(rcop);
2652 rcop->op_next = 0;
79072805
LW		 2653 }
2654 }
2655
2656 return (OP*)pm;
2657}
2658
2659OP *
864dbfa3 2660Perl_newSVOP(pTHX_ I32 type, I32 flags, SV *sv)
79072805
LW		 2661{
2662 SVOP *svop;
b7dc083c 2663 NewOp(1101, svop, 1, SVOP);
79072805 2664 svop->op_type = type;
22c35a8c 2665 svop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2666 svop->op_sv = sv;
2667 svop->op_next = (OP*)svop;
2668 svop->op_flags = flags;
22c35a8c 2669 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2670 scalar((OP*)svop);
22c35a8c 2671 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2672 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2673 return CHECKOP(type, svop);
79072805
LW		 2674}
2675
2676OP *
864dbfa3 2677Perl_newGVOP(pTHX_ I32 type, I32 flags, GV *gv)
79072805 2678{
11343788 2679 dTHR;
79072805 2680 GVOP *gvop;
b7dc083c 2681 NewOp(1101, gvop, 1, GVOP);
79072805 2682 gvop->op_type = type;
22c35a8c 2683 gvop->op_ppaddr = PL_ppaddr[type];
8990e307 2684 gvop->op_gv = (GV*)SvREFCNT_inc(gv);
79072805
LW		 2685 gvop->op_next = (OP*)gvop;
2686 gvop->op_flags = flags;
22c35a8c 2687 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2688 scalar((OP*)gvop);
22c35a8c 2689 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2690 gvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2691 return CHECKOP(type, gvop);
79072805
LW		 2692}
2693
2694OP *
864dbfa3 2695Perl_newPVOP(pTHX_ I32 type, I32 flags, char *pv)
79072805
LW		 2696{
2697 PVOP *pvop;
b7dc083c 2698 NewOp(1101, pvop, 1, PVOP);
79072805 2699 pvop->op_type = type;
22c35a8c 2700 pvop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2701 pvop->op_pv = pv;
2702 pvop->op_next = (OP*)pvop;
2703 pvop->op_flags = flags;
22c35a8c 2704 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2705 scalar((OP*)pvop);
22c35a8c 2706 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2707 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2708 return CHECKOP(type, pvop);
79072805
LW		 2709}
2710
79072805 2711void
864dbfa3 2712Perl_package(pTHX_ OP *o)
79072805 2713{
11343788 2714 dTHR;
93a17b20 2715 SV *sv;
79072805 2716
3280af22
NIS		 2717 save_hptr(&PL_curstash);
2718 save_item(PL_curstname);
11343788 2719 if (o) {
463ee0b2
LW		 2720 STRLEN len;
2721 char *name;
11343788 2722 sv = cSVOPo->op_sv;
463ee0b2 2723 name = SvPV(sv, len);
3280af22
NIS		 2724 PL_curstash = gv_stashpvn(name,len,TRUE);
2725 sv_setpvn(PL_curstname, name, len);
11343788 2726 op_free(o);
93a17b20
LW		 2727 }
2728 else {
3280af22
NIS		 2729 sv_setpv(PL_curstname,"<none>");
2730 PL_curstash = Nullhv;
93a17b20 2731 }
7ad382f4 2732 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 2733 PL_copline = NOLINE;
2734 PL_expect = XSTATE;
79072805
LW		 2735}
2736
85e6fe83 2737void
864dbfa3 2738Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *id, OP *arg)
85e6fe83 2739{
a0d0e21e
LW		 2740 OP *pack;
2741 OP *meth;
2742 OP *rqop;
2743 OP *imop;
b1cb66bf 2744 OP *veop;
78ca652e 2745 GV *gv;
85e6fe83 2746
a0d0e21e 2747 if (id->op_type != OP_CONST)
cea2e8a9 2748 Perl_croak(aTHX_ "Module name must be constant");
85e6fe83 2749
b1cb66bf 2750 veop = Nullop;
2751
2752 if(version != Nullop) {
2753 SV *vesv = ((SVOP*)version)->op_sv;
2754
2755 if (arg == Nullop && !SvNIOK(vesv)) {
2756 arg = version;
2757 }
2758 else {
2759 OP *pack;
2760 OP *meth;
2761
2762 if (version->op_type != OP_CONST || !SvNIOK(vesv))
cea2e8a9 2763 Perl_croak(aTHX_ "Version number must be constant number");
b1cb66bf 2764
2765 /* Make copy of id so we don't free it twice */
2766 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
2767
2768 /* Fake up a method call to VERSION */
79cb57f6 2769 meth = newSVOP(OP_CONST, 0, newSVpvn("VERSION", 7));
b1cb66bf 2770 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
2771 append_elem(OP_LIST,
2772 prepend_elem(OP_LIST, pack, list(version)),
2773 newUNOP(OP_METHOD, 0, meth)));
2774 }
2775 }
aeea060c 2776
a0d0e21e 2777 /* Fake up an import/unimport */
4633a7c4
LW		 2778 if (arg && arg->op_type == OP_STUB)
2779 imop = arg; /* no import on explicit () */
b1cb66bf 2780 else if(SvNIOK(((SVOP*)id)->op_sv)) {
2781 imop = Nullop; /* use 5.0; */
2782 }
4633a7c4
LW		 2783 else {
2784 /* Make copy of id so we don't free it twice */
2785 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
4633a7c4
LW		 2786 meth = newSVOP(OP_CONST, 0,
2787 aver
79cb57f6
GS		 2788 ? newSVpvn("import", 6)
2789 : newSVpvn("unimport", 8)
4633a7c4
LW		 2790 );
2791 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
a0d0e21e
LW		 2792 append_elem(OP_LIST,
2793 prepend_elem(OP_LIST, pack, list(arg)),
2794 newUNOP(OP_METHOD, 0, meth)));
4633a7c4
LW		 2795 }
2796
78ca652e
GS		 2797 /* Fake up a require, handle override, if any */
2798 gv = gv_fetchpv("require", FALSE, SVt_PVCV);
2799 if (!(gv && GvIMPORTED_CV(gv)))
2800 gv = gv_fetchpv("CORE::GLOBAL::require", FALSE, SVt_PVCV);
2801
2802 if (gv && GvIMPORTED_CV(gv)) {
2803 rqop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
2804 append_elem(OP_LIST, id,
2805 scalar(newUNOP(OP_RV2CV, 0,
2806 newGVOP(OP_GV, 0,
2807 gv))))));
2808 }
2809 else {
2810 rqop = newUNOP(OP_REQUIRE, 0, id);
2811 }
a0d0e21e
LW		 2812
2813 /* Fake up the BEGIN {}, which does its thing immediately. */
c07a80fd 2814 newSUB(floor,
79cb57f6 2815 newSVOP(OP_CONST, 0, newSVpvn("BEGIN", 5)),
4633a7c4 2816 Nullop,
a0d0e21e 2817 append_elem(OP_LINESEQ,
b1cb66bf 2818 append_elem(OP_LINESEQ,
2819 newSTATEOP(0, Nullch, rqop),
2820 newSTATEOP(0, Nullch, veop)),
a0d0e21e 2821 newSTATEOP(0, Nullch, imop) ));
85e6fe83 2822
3280af22
NIS		 2823 PL_copline = NOLINE;
2824 PL_expect = XSTATE;
85e6fe83
LW		 2825}
2826
79072805 2827OP *
864dbfa3 2828Perl_dofile(pTHX_ OP *term)
78ca652e
GS		 2829{
2830 OP *doop;
2831 GV *gv;
2832
2833 gv = gv_fetchpv("do", FALSE, SVt_PVCV);
2834 if (!(gv && GvIMPORTED_CV(gv)))
2835 gv = gv_fetchpv("CORE::GLOBAL::do", FALSE, SVt_PVCV);
2836
2837 if (gv && GvIMPORTED_CV(gv)) {
2838 doop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
2839 append_elem(OP_LIST, term,
2840 scalar(newUNOP(OP_RV2CV, 0,
2841 newGVOP(OP_GV, 0,
2842 gv))))));
2843 }
2844 else {
2845 doop = newUNOP(OP_DOFILE, 0, scalar(term));
2846 }
2847 return doop;
2848}
2849
2850OP *
864dbfa3 2851Perl_newSLICEOP(pTHX_ I32 flags, OP *subscript, OP *listval)
79072805
LW		 2852{
2853 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 2854 list(force_list(subscript)),
2855 list(force_list(listval)) );
79072805
LW		 2856}
2857
76e3520e 2858STATIC I32
cea2e8a9 2859S_list_assignment(pTHX_ register OP *o)
79072805 2860{
11343788 2861 if (!o)
79072805
LW		 2862 return TRUE;
2863
11343788
MB		 2864 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
2865 o = cUNOPo->op_first;
79072805 2866
11343788
MB		 2867 if (o->op_type == OP_COND_EXPR) {
2868 I32 t = list_assignment(cCONDOPo->op_first->op_sibling);
2869 I32 f = list_assignment(cCONDOPo->op_first->op_sibling->op_sibling);
79072805
LW		 2870
2871 if (t && f)
2872 return TRUE;
2873 if (t || f)
2874 yyerror("Assignment to both a list and a scalar");
2875 return FALSE;
2876 }
2877
11343788
MB		 2878 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
2879 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
2880 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 2881 return TRUE;
2882
11343788 2883 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 2884 return TRUE;
2885
11343788 2886 if (o->op_type == OP_RV2SV)
79072805
LW		 2887 return FALSE;
2888
2889 return FALSE;
2890}
2891
2892OP *
864dbfa3 2893Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
79072805 2894{
11343788 2895 OP *o;
79072805 2896
a0d0e21e
LW		 2897 if (optype) {
2898 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN) {
2899 return newLOGOP(optype, 0,
2900 mod(scalar(left), optype),
2901 newUNOP(OP_SASSIGN, 0, scalar(right)));
2902 }
2903 else {
2904 return newBINOP(optype, OPf_STACKED,
2905 mod(scalar(left), optype), scalar(right));
2906 }
2907 }
2908
79072805 2909 if (list_assignment(left)) {
6ee623d5 2910 dTHR;
3280af22
NIS		 2911 PL_modcount = 0;
2912 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 2913 left = mod(left, OP_AASSIGN);
3280af22
NIS		 2914 if (PL_eval_start)
2915 PL_eval_start = 0;
748a9306 2916 else {
a0d0e21e
LW		 2917 op_free(left);
2918 op_free(right);
2919 return Nullop;
2920 }
11343788 2921 o = newBINOP(OP_AASSIGN, flags,
8990e307
LW		 2922 list(force_list(right)),
2923 list(force_list(left)) );
11343788 2924 o->op_private = 0 | (flags >> 8);
a0d0e21e 2925 if (!(left->op_private & OPpLVAL_INTRO)) {
79072805 2926 OP *curop;
11343788 2927 OP *lastop = o;
3280af22 2928 PL_generation++;
11343788 2929 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
22c35a8c 2930 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805
LW		 2931 if (curop->op_type == OP_GV) {
2932 GV *gv = ((GVOP*)curop)->op_gv;
3280af22 2933 if (gv == PL_defgv || SvCUR(gv) == PL_generation)
79072805 2934 break;
3280af22 2935 SvCUR(gv) = PL_generation;
79072805 2936 }
748a9306
LW		 2937 else if (curop->op_type == OP_PADSV ||
2938 curop->op_type == OP_PADAV ||
2939 curop->op_type == OP_PADHV ||
2940 curop->op_type == OP_PADANY) {
3280af22 2941 SV **svp = AvARRAY(PL_comppad_name);
8e07c86e 2942 SV *sv = svp[curop->op_targ];
3280af22 2943 if (SvCUR(sv) == PL_generation)
748a9306 2944 break;
3280af22 2945 SvCUR(sv) = PL_generation; /* (SvCUR not used any more) */
748a9306 2946 }
79072805
LW		 2947 else if (curop->op_type == OP_RV2CV)
2948 break;
2949 else if (curop->op_type == OP_RV2SV ||
2950 curop->op_type == OP_RV2AV ||
2951 curop->op_type == OP_RV2HV ||
2952 curop->op_type == OP_RV2GV) {
2953 if (lastop->op_type != OP_GV) /* funny deref? */
2954 break;
2955 }
1167e5da
SM		 2956 else if (curop->op_type == OP_PUSHRE) {
2957 if (((PMOP*)curop)->op_pmreplroot) {
2958 GV *gv = (GV*)((PMOP*)curop)->op_pmreplroot;
3280af22 2959 if (gv == PL_defgv || SvCUR(gv) == PL_generation)
1167e5da 2960 break;
3280af22 2961 SvCUR(gv) = PL_generation;
1167e5da
SM		 2962 }
2963 }
79072805
LW		 2964 else
2965 break;
2966 }
2967 lastop = curop;
2968 }
11343788
MB		 2969 if (curop != o)
2970 o->op_private = OPpASSIGN_COMMON;
79072805 2971 }
c07a80fd 2972 if (right && right->op_type == OP_SPLIT) {
2973 OP* tmpop;
2974 if ((tmpop = ((LISTOP*)right)->op_first) &&
2975 tmpop->op_type == OP_PUSHRE)
2976 {
2977 PMOP *pm = (PMOP*)tmpop;
2978 if (left->op_type == OP_RV2AV &&
2979 !(left->op_private & OPpLVAL_INTRO) &&
11343788 2980 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 2981 {
2982 tmpop = ((UNOP*)left)->op_first;
2983 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
2984 pm->op_pmreplroot = (OP*)((GVOP*)tmpop)->op_gv;
2985 pm->op_pmflags |= PMf_ONCE;
11343788 2986 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 2987 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
2988 tmpop->op_sibling = Nullop; /* don't free split */
2989 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 2990 op_free(o); /* blow off assign */
54310121 2991 right->op_flags &= ~OPf_WANT;
a5f75d66 2992 /* "I don't know and I don't care." */
c07a80fd 2993 return right;
2994 }
2995 }
2996 else {
3280af22 2997 if (PL_modcount < 10000 &&
c07a80fd 2998 ((LISTOP*)right)->op_last->op_type == OP_CONST)
2999 {
3000 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
3001 if (SvIVX(sv) == 0)
3280af22 3002 sv_setiv(sv, PL_modcount+1);
c07a80fd 3003 }
3004 }
3005 }
3006 }
11343788 3007 return o;
79072805
LW		 3008 }
3009 if (!right)
3010 right = newOP(OP_UNDEF, 0);
3011 if (right->op_type == OP_READLINE) {
3012 right->op_flags |= OPf_STACKED;
463ee0b2 3013 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 3014 }
a0d0e21e 3015 else {
3280af22 3016 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 3017 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 3018 scalar(right), mod(scalar(left), OP_SASSIGN) );
3280af22
NIS		 3019 if (PL_eval_start)
3020 PL_eval_start = 0;
748a9306 3021 else {
11343788 3022 op_free(o);
a0d0e21e
LW		 3023 return Nullop;
3024 }
3025 }
11343788 3026 return o;
79072805
LW		 3027}
3028
3029OP *
864dbfa3 3030Perl_newSTATEOP(pTHX_ I32 flags, char *label, OP *o)
79072805 3031{
11343788 3032 dTHR;
bbce6d69 3033 U32 seq = intro_my();
79072805
LW		 3034 register COP *cop;
3035
b7dc083c 3036 NewOp(1101, cop, 1, COP);
3280af22 3037 if (PERLDB_LINE && PL_curcop->cop_line && PL_curstash != PL_debstash) {
8990e307 3038 cop->op_type = OP_DBSTATE;
22c35a8c 3039 cop->op_ppaddr = PL_ppaddr[ OP_DBSTATE ];
8990e307
LW		 3040 }
3041 else {
3042 cop->op_type = OP_NEXTSTATE;
22c35a8c 3043 cop->op_ppaddr = PL_ppaddr[ OP_NEXTSTATE ];
8990e307 3044 }
79072805 3045 cop->op_flags = flags;
a0ed51b3 3046 cop->op_private = (PL_hints & HINT_UTF8);
ff0cee69 3047#ifdef NATIVE_HINTS
3048 cop->op_private |= NATIVE_HINTS;
3049#endif
e24b16f9 3050 PL_compiling.op_private = cop->op_private;
79072805
LW		 3051 cop->op_next = (OP*)cop;
3052
463ee0b2
LW		 3053 if (label) {
3054 cop->cop_label = label;
3280af22 3055 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 3056 }
bbce6d69 3057 cop->cop_seq = seq;
3280af22 3058 cop->cop_arybase = PL_curcop->cop_arybase;
599cee73
PM		 3059 if (PL_curcop->cop_warnings == WARN_NONE
3060 || PL_curcop->cop_warnings == WARN_ALL)
3061 cop->cop_warnings = PL_curcop->cop_warnings ;
3062 else
3063 cop->cop_warnings = newSVsv(PL_curcop->cop_warnings) ;
3064
79072805 3065
3280af22
NIS		 3066 if (PL_copline == NOLINE)
3067 cop->cop_line = PL_curcop->cop_line;
79072805 3068 else {
3280af22
NIS		 3069 cop->cop_line = PL_copline;
3070 PL_copline = NOLINE;
79072805 3071 }
3280af22
NIS		 3072 cop->cop_filegv = (GV*)SvREFCNT_inc(PL_curcop->cop_filegv);
3073 cop->cop_stash = PL_curstash;
79072805 3074
3280af22
NIS		 3075 if (PERLDB_LINE && PL_curstash != PL_debstash) {
3076 SV **svp = av_fetch(GvAV(PL_curcop->cop_filegv),(I32)cop->cop_line, FALSE);
3077 if (svp && *svp != &PL_sv_undef && !SvIOK(*svp)) {
a0d0e21e 3078 (void)SvIOK_on(*svp);
a5f75d66 3079 SvIVX(*svp) = 1;
93a17b20
LW		 3080 SvSTASH(*svp) = (HV*)cop;
3081 }
3082 }
3083
11343788 3084 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 3085}
3086
bbce6d69 3087/* "Introduce" my variables to visible status. */
3088U32
864dbfa3 3089Perl_intro_my(pTHX)
bbce6d69 3090{
3091 SV **svp;
3092 SV *sv;
3093 I32 i;
3094
3280af22
NIS		 3095 if (! PL_min_intro_pending)
3096 return PL_cop_seqmax;
bbce6d69 3097
3280af22
NIS		 3098 svp = AvARRAY(PL_comppad_name);
3099 for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) {
3100 if ((sv = svp[i]) && sv != &PL_sv_undef && !SvIVX(sv)) {
c53d7c7d 3101 SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */
65202027 3102 SvNVX(sv) = (NV)PL_cop_seqmax;
bbce6d69 3103 }
3104 }
3280af22
NIS		 3105 PL_min_intro_pending = 0;
3106 PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */
3107 return PL_cop_seqmax++;
bbce6d69 3108}
3109
79072805 3110OP *
864dbfa3 3111Perl_newLOGOP(pTHX_ I32 type, I32 flags, OP *first, OP *other)
79072805 3112{
883ffac3
CS		 3113 return new_logop(type, flags, &first, &other);
3114}
3115
3bd495df 3116STATIC OP *
cea2e8a9 3117S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
883ffac3 3118{
11343788 3119 dTHR;
79072805 3120 LOGOP *logop;
11343788 3121 OP *o;
883ffac3
CS		 3122 OP *first = *firstp;
3123 OP *other = *otherp;
79072805 3124
a0d0e21e
LW		 3125 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
3126 return newBINOP(type, flags, scalar(first), scalar(other));
3127
8990e307 3128 scalarboolean(first);
79072805
LW		 3129 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
3130 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
3131 if (type == OP_AND || type == OP_OR) {
3132 if (type == OP_AND)
3133 type = OP_OR;
3134 else
3135 type = OP_AND;
11343788 3136 o = first;
883ffac3 3137 first = *firstp = cUNOPo->op_first;
11343788
MB		 3138 if (o->op_next)
3139 first->op_next = o->op_next;
3140 cUNOPo->op_first = Nullop;
3141 op_free(o);
79072805
LW		 3142 }
3143 }
3144 if (first->op_type == OP_CONST) {
599cee73 3145 if (ckWARN(WARN_PRECEDENCE) && (first->op_private & OPpCONST_BARE))
cea2e8a9 3146 Perl_warner(aTHX_ WARN_PRECEDENCE, "Probable precedence problem on %s",
22c35a8c 3147 PL_op_desc[type]);
79072805
LW		 3148 if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
3149 op_free(first);
883ffac3 3150 *firstp = Nullop;
79072805
LW		 3151 return other;
3152 }
3153 else {
3154 op_free(other);
883ffac3 3155 *otherp = Nullop;
79072805
LW		 3156 return first;
3157 }
3158 }
3159 else if (first->op_type == OP_WANTARRAY) {
3160 if (type == OP_AND)
3161 list(other);
3162 else
3163 scalar(other);
3164 }
599cee73 3165 else if (ckWARN(WARN_UNSAFE) && (first->op_flags & OPf_KIDS)) {
a6006777 3166 OP *k1 = ((UNOP*)first)->op_first;
3167 OP *k2 = k1->op_sibling;
3168 OPCODE warnop = 0;
3169 switch (first->op_type)
3170 {
3171 case OP_NULL:
3172 if (k2 && k2->op_type == OP_READLINE
3173 && (k2->op_flags & OPf_STACKED)
55d729e4 3174 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
a6006777 3175 warnop = k2->op_type;
3176 break;
3177
3178 case OP_SASSIGN:
68dc0745 3179 if (k1->op_type == OP_READDIR
3180 || k1->op_type == OP_GLOB
3181 || k1->op_type == OP_EACH)
a6006777 3182 warnop = k1->op_type;
3183 break;
3184 }
8ebc5c01 3185 if (warnop) {
3280af22
NIS		 3186 line_t oldline = PL_curcop->cop_line;
3187 PL_curcop->cop_line = PL_copline;
cea2e8a9 3188 Perl_warner(aTHX_ WARN_UNSAFE,
599cee73 3189 "Value of %s%s can be \"0\"; test with defined()",
22c35a8c 3190 PL_op_desc[warnop],
68dc0745 3191 ((warnop == OP_READLINE || warnop == OP_GLOB)
3192 ? " construct" : "() operator"));
3280af22 3193 PL_curcop->cop_line = oldline;
8ebc5c01 3194 }
a6006777 3195 }
79072805
LW		 3196
3197 if (!other)
3198 return first;
3199
a0d0e21e
LW		 3200 if (type == OP_ANDASSIGN || type == OP_ORASSIGN)
3201 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
3202
b7dc083c 3203 NewOp(1101, logop, 1, LOGOP);
79072805
LW		 3204
3205 logop->op_type = type;
22c35a8c 3206 logop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3207 logop->op_first = first;
3208 logop->op_flags = flags | OPf_KIDS;
3209 logop->op_other = LINKLIST(other);
c07a80fd 3210 logop->op_private = 1 | (flags >> 8);
79072805
LW		 3211
3212 /* establish postfix order */
3213 logop->op_next = LINKLIST(first);
3214 first->op_next = (OP*)logop;
3215 first->op_sibling = other;
3216
11343788
MB		 3217 o = newUNOP(OP_NULL, 0, (OP*)logop);
3218 other->op_next = o;
79072805 3219
11343788 3220 return o;
79072805
LW		 3221}
3222
3223OP *
864dbfa3 3224Perl_newCONDOP(pTHX_ I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 3225{
11343788 3226 dTHR;
79072805 3227 CONDOP *condop;
11343788 3228 OP *o;
79072805 3229
b1cb66bf 3230 if (!falseop)
3231 return newLOGOP(OP_AND, 0, first, trueop);
3232 if (!trueop)
3233 return newLOGOP(OP_OR, 0, first, falseop);
79072805 3234
8990e307 3235 scalarboolean(first);
79072805
LW		 3236 if (first->op_type == OP_CONST) {
3237 if (SvTRUE(((SVOP*)first)->op_sv)) {
3238 op_free(first);
b1cb66bf 3239 op_free(falseop);
3240 return trueop;
79072805
LW		 3241 }
3242 else {
3243 op_free(first);
b1cb66bf 3244 op_free(trueop);
3245 return falseop;
79072805
LW		 3246 }
3247 }
3248 else if (first->op_type == OP_WANTARRAY) {
b1cb66bf 3249 list(trueop);
3250 scalar(falseop);
79072805 3251 }
b7dc083c 3252 NewOp(1101, condop, 1, CONDOP);
79072805
LW		 3253
3254 condop->op_type = OP_COND_EXPR;
22c35a8c 3255 condop->op_ppaddr = PL_ppaddr[OP_COND_EXPR];
79072805
LW		 3256 condop->op_first = first;
3257 condop->op_flags = flags | OPf_KIDS;
b1cb66bf 3258 condop->op_true = LINKLIST(trueop);
3259 condop->op_false = LINKLIST(falseop);
c07a80fd 3260 condop->op_private = 1 | (flags >> 8);
79072805
LW		 3261
3262 /* establish postfix order */
3263 condop->op_next = LINKLIST(first);
3264 first->op_next = (OP*)condop;
3265
b1cb66bf 3266 first->op_sibling = trueop;
3267 trueop->op_sibling = falseop;
11343788 3268 o = newUNOP(OP_NULL, 0, (OP*)condop);
79072805 3269
5dc0d613
MB		 3270 trueop->op_next = o;
3271 falseop->op_next = o;
79072805 3272
11343788 3273 return o;
79072805
LW		 3274}
3275
3276OP *
864dbfa3 3277Perl_newRANGE(pTHX_ I32 flags, OP *left, OP *right)
79072805 3278{
b35b2403 3279 dTHR;
79072805
LW		 3280 CONDOP *condop;
3281 OP *flip;
3282 OP *flop;
11343788 3283 OP *o;
79072805 3284
b7dc083c 3285 NewOp(1101, condop, 1, CONDOP);
79072805
LW		 3286
3287 condop->op_type = OP_RANGE;
22c35a8c 3288 condop->op_ppaddr = PL_ppaddr[OP_RANGE];
79072805
LW		 3289 condop->op_first = left;
3290 condop->op_flags = OPf_KIDS;
3291 condop->op_true = LINKLIST(left);
3292 condop->op_false = LINKLIST(right);
c07a80fd 3293 condop->op_private = 1 | (flags >> 8);
79072805
LW		 3294
3295 left->op_sibling = right;
3296
3297 condop->op_next = (OP*)condop;
3298 flip = newUNOP(OP_FLIP, flags, (OP*)condop);
3299 flop = newUNOP(OP_FLOP, 0, flip);
11343788 3300 o = newUNOP(OP_NULL, 0, flop);
79072805
LW		 3301 linklist(flop);
3302
3303 left->op_next = flip;
3304 right->op_next = flop;
3305
ed6116ce 3306 condop->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805 3307 sv_upgrade(PAD_SV(condop->op_targ), SVt_PVNV);
ed6116ce 3308 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 3309 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
3310
3311 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3312 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3313
11343788 3314 flip->op_next = o;
79072805 3315 if (!flip->op_private || !flop->op_private)
11343788 3316 linklist(o); /* blow off optimizer unless constant */
79072805 3317
11343788 3318 return o;
79072805
LW		 3319}
3320
3321OP *
864dbfa3 3322Perl_newLOOPOP(pTHX_ I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 3323{
11343788 3324 dTHR;
463ee0b2 3325 OP* listop;
11343788 3326 OP* o;
463ee0b2 3327 int once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 3328 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
93a17b20 3329
463ee0b2
LW		 3330 if (expr) {
3331 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
3332 return block; /* do {} while 0 does once */
fb73857a 3333 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3334 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 3335 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3336 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 3337 } else if (expr->op_flags & OPf_KIDS) {
3338 OP *k1 = ((UNOP*)expr)->op_first;
3339 OP *k2 = (k1) ? k1->op_sibling : NULL;
3340 switch (expr->op_type) {
3341 case OP_NULL:
3342 if (k2 && k2->op_type == OP_READLINE
3343 && (k2->op_flags & OPf_STACKED)
3344 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
3345 expr = newUNOP(OP_DEFINED, 0, expr);
3346 break;
3347
3348 case OP_SASSIGN:
3349 if (k1->op_type == OP_READDIR
3350 || k1->op_type == OP_GLOB
3351 || k1->op_type == OP_EACH)
3352 expr = newUNOP(OP_DEFINED, 0, expr);
3353 break;
3354 }
774d564b 3355 }
463ee0b2 3356 }
93a17b20 3357
8990e307 3358 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
883ffac3 3359 o = new_logop(OP_AND, 0, &expr, &listop);
463ee0b2 3360
883ffac3
CS		 3361 if (listop)
3362 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 3363
11343788
MB		 3364 if (once && o != listop)
3365 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 3366
11343788
MB		 3367 if (o == listop)
3368 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 3369
11343788
MB		 3370 o->op_flags |= flags;
3371 o = scope(o);
3372 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
3373 return o;
79072805
LW		 3374}
3375
3376OP *
864dbfa3 3377Perl_newWHILEOP(pTHX_ I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *expr, OP *block, OP *cont)
79072805 3378{
11343788 3379 dTHR;
79072805
LW		 3380 OP *redo;
3381 OP *next = 0;
3382 OP *listop;
11343788 3383 OP *o;
79072805
LW		 3384 OP *condop;
3385
fb73857a 3386 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3387 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB))) {
748a9306 3388 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3389 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 3390 } else if (expr && (expr->op_flags & OPf_KIDS)) {
3391 OP *k1 = ((UNOP*)expr)->op_first;
3392 OP *k2 = (k1) ? k1->op_sibling : NULL;
3393 switch (expr->op_type) {
3394 case OP_NULL:
3395 if (k2 && k2->op_type == OP_READLINE
3396 && (k2->op_flags & OPf_STACKED)
3397 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
3398 expr = newUNOP(OP_DEFINED, 0, expr);
3399 break;
3400
3401 case OP_SASSIGN:
3402 if (k1->op_type == OP_READDIR
3403 || k1->op_type == OP_GLOB
3404 || k1->op_type == OP_EACH)
3405 expr = newUNOP(OP_DEFINED, 0, expr);
3406 break;
3407 }
748a9306 3408 }
79072805
LW		 3409
3410 if (!block)
3411 block = newOP(OP_NULL, 0);
3412
3413 if (cont)
3414 next = LINKLIST(cont);
fb73857a 3415 if (expr) {
79072805 3416 cont = append_elem(OP_LINESEQ, cont, newOP(OP_UNSTACK, 0));
fb73857a 3417 if ((line_t)whileline != NOLINE) {
3280af22 3418 PL_copline = whileline;
fb73857a 3419 cont = append_elem(OP_LINESEQ, cont,
3420 newSTATEOP(0, Nullch, Nullop));
3421 }
3422 }
79072805 3423
463ee0b2 3424 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 3425 redo = LINKLIST(listop);
3426
3427 if (expr) {
3280af22 3428 PL_copline = whileline;
883ffac3
CS		 3429 scalar(listop);
3430 o = new_logop(OP_AND, 0, &expr, &listop);
11343788 3431 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 3432 op_free(expr); /* oops, it's a while (0) */
463ee0b2 3433 op_free((OP*)loop);
883ffac3 3434 return Nullop; /* listop already freed by new_logop */
463ee0b2 3435 }
883ffac3
CS		 3436 if (listop)
3437 ((LISTOP*)listop)->op_last->op_next = condop =
3438 (o == listop ? redo : LINKLIST(o));
79072805
LW		 3439 if (!next)
3440 next = condop;
3441 }
3442 else
11343788 3443 o = listop;
79072805
LW		 3444
3445 if (!loop) {
b7dc083c 3446 NewOp(1101,loop,1,LOOP);
79072805 3447 loop->op_type = OP_ENTERLOOP;
22c35a8c 3448 loop->op_ppaddr = PL_ppaddr[OP_ENTERLOOP];
79072805
LW		 3449 loop->op_private = 0;
3450 loop->op_next = (OP*)loop;
3451 }
3452
11343788 3453 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 3454
3455 loop->op_redoop = redo;
11343788 3456 loop->op_lastop = o;
79072805
LW		 3457
3458 if (next)
3459 loop->op_nextop = next;
3460 else
11343788 3461 loop->op_nextop = o;
79072805 3462
11343788
MB		 3463 o->op_flags |= flags;
3464 o->op_private |= (flags >> 8);
3465 return o;
79072805
LW		 3466}
3467
3468OP *
864dbfa3 3469Perl_newFOROP(pTHX_ I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *block,OP *cont)
79072805
LW		 3470{
3471 LOOP *loop;
b7dc083c 3472 LOOP *tmp;
fb73857a 3473 OP *wop;
85e6fe83 3474 int padoff = 0;
4633a7c4 3475 I32 iterflags = 0;
79072805 3476
79072805 3477 if (sv) {
85e6fe83 3478 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
748a9306 3479 sv->op_type = OP_RV2GV;
22c35a8c 3480 sv->op_ppaddr = PL_ppaddr[OP_RV2GV];
79072805 3481 }
85e6fe83
LW		 3482 else if (sv->op_type == OP_PADSV) { /* private variable */
3483 padoff = sv->op_targ;
3484 op_free(sv);
3485 sv = Nullop;
3486 }
54b9620d
MB		 3487 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
3488 padoff = sv->op_targ;
3489 iterflags |= OPf_SPECIAL;
3490 op_free(sv);
3491 sv = Nullop;
3492 }
79072805 3493 else
cea2e8a9 3494 Perl_croak(aTHX_ "Can't use %s for loop variable", PL_op_desc[sv->op_type]);
79072805
LW		 3495 }
3496 else {
54b9620d
MB		 3497#ifdef USE_THREADS
3498 padoff = find_threadsv("_");
3499 iterflags |= OPf_SPECIAL;
3500#else
3280af22 3501 sv = newGVOP(OP_GV, 0, PL_defgv);
54b9620d 3502#endif
79072805 3503 }
5f05dabc 3504 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
89ea2908 3505