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more basic support for building modules under Windows 95/98
[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 20#include "perl.h"
77ca0c92 21#include "keywords.h"
79072805 22
b7dc083c
NIS		 23/* #define PL_OP_SLAB_ALLOC */
24
25#ifdef PL_OP_SLAB_ALLOC
26#define SLAB_SIZE 8192
27static char *PL_OpPtr = NULL;
28static int PL_OpSpace = 0;
29#define NewOp(m,var,c,type) do { if ((PL_OpSpace -= c*sizeof(type)) >= 0) \
30 var = (type *)(PL_OpPtr -= c*sizeof(type)); \
31 else \
32 var = (type *) Slab_Alloc(m,c*sizeof(type)); \
33 } while (0)
34
864dbfa3 35STATIC void *
cea2e8a9 36S_Slab_Alloc(pTHX_ int m, size_t sz)
b7dc083c
NIS		 37{
38 Newz(m,PL_OpPtr,SLAB_SIZE,char);
39 PL_OpSpace = SLAB_SIZE - sz;
40 return PL_OpPtr += PL_OpSpace;
41}
76e3520e 42
b7dc083c
NIS		 43#else
44#define NewOp(m, var, c, type) Newz(m, var, c, type)
45#endif
e50aee73 46/*
5dc0d613 47 * In the following definition, the ", Nullop" is just to make the compiler
a5f75d66 48 * think the expression is of the right type: croak actually does a Siglongjmp.
e50aee73 49 */
11343788 50#define CHECKOP(type,o) \
3280af22 51 ((PL_op_mask && PL_op_mask[type]) \
5dc0d613 52 ? ( op_free((OP*)o), \
cea2e8a9 53 Perl_croak(aTHX_ "%s trapped by operation mask", PL_op_desc[type]), \
28757baa 54 Nullop ) \
fc0dc3b3 55 : CALL_FPTR(PL_check[type])(aTHX_ (OP*)o))
e50aee73 56
c53d7c7d
HS		 57#define PAD_MAX 999999999
58
76e3520e 59STATIC char*
cea2e8a9 60S_gv_ename(pTHX_ GV *gv)
4633a7c4 61{
2d8e6c8d 62 STRLEN n_a;
4633a7c4 63 SV* tmpsv = sv_newmortal();
46fc3d4c 64 gv_efullname3(tmpsv, gv, Nullch);
2d8e6c8d 65 return SvPV(tmpsv,n_a);
4633a7c4
LW		 66}
67
76e3520e 68STATIC OP *
cea2e8a9 69S_no_fh_allowed(pTHX_ OP *o)
79072805 70{
cea2e8a9 71 yyerror(Perl_form(aTHX_ "Missing comma after first argument to %s function",
22c35a8c 72 PL_op_desc[o->op_type]));
11343788 73 return o;
79072805
LW		 74}
75
76e3520e 76STATIC OP *
cea2e8a9 77S_too_few_arguments(pTHX_ OP *o, char *name)
79072805 78{
cea2e8a9 79 yyerror(Perl_form(aTHX_ "Not enough arguments for %s", name));
11343788 80 return o;
79072805
LW		 81}
82
76e3520e 83STATIC OP *
cea2e8a9 84S_too_many_arguments(pTHX_ OP *o, char *name)
79072805 85{
cea2e8a9 86 yyerror(Perl_form(aTHX_ "Too many arguments for %s", name));
11343788 87 return o;
79072805
LW		 88}
89
76e3520e 90STATIC void
cea2e8a9 91S_bad_type(pTHX_ I32 n, char *t, char *name, OP *kid)
8990e307 92{
cea2e8a9 93 yyerror(Perl_form(aTHX_ "Type of arg %d to %s must be %s (not %s)",
22c35a8c 94 (int)n, name, t, PL_op_desc[kid->op_type]));
8990e307
LW		 95}
96
7a52d87a 97STATIC void
cea2e8a9 98S_no_bareword_allowed(pTHX_ OP *o)
7a52d87a 99{
5a844595
GS		 100 qerror(Perl_mess(aTHX_
101 "Bareword \"%s\" not allowed while \"strict subs\" in use",
102 SvPV_nolen(cSVOPo->op_sv)));
7a52d87a
GS		 103}
104
79072805
LW		 105/* "register" allocation */
106
107PADOFFSET
864dbfa3 108Perl_pad_allocmy(pTHX_ char *name)
93a17b20 109{
11343788 110 dTHR;
a0d0e21e
LW		 111 PADOFFSET off;
112 SV *sv;
113
834a4ddd 114 if (!(
77ca0c92 115 PL_in_my == KEY_our ||
834a4ddd
LW		 116 isALPHA(name[1]) ||
117 (PL_hints & HINT_UTF8 && (name[1] & 0xc0) == 0xc0) ||
77ca0c92 118 name[1] == '_' && (int)strlen(name) > 2 ))
834a4ddd 119 {
c4d0567e 120 if (!isPRINT(name[1]) || strchr("\t\n\r\f", name[1])) {
2b92dfce
GS		 121 /* 1999-02-27 mjd@plover.com */
122 char *p;
123 p = strchr(name, '\0');
124 /* The next block assumes the buffer is at least 205 chars
125 long. At present, it's always at least 256 chars. */
126 if (p-name > 200) {
127 strcpy(name+200, "...");
128 p = name+199;
129 }
130 else {
131 p[1] = '\0';
132 }
133 /* Move everything else down one character */
134 for (; p-name > 2; p--)
135 *p = *(p-1);
46fc3d4c 136 name[2] = toCTRL(name[1]);
137 name[1] = '^';
138 }
cea2e8a9 139 yyerror(Perl_form(aTHX_ "Can't use global %s in \"my\"",name));
a0d0e21e 140 }
599cee73 141 if (ckWARN(WARN_UNSAFE) && AvFILLp(PL_comppad_name) >= 0) {
3280af22
NIS		 142 SV **svp = AvARRAY(PL_comppad_name);
143 for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_floor; off--) {
b1cb66bf 144 if ((sv = svp[off])
3280af22 145 && sv != &PL_sv_undef
c53d7c7d 146 && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0)
b1cb66bf 147 && strEQ(name, SvPVX(sv)))
148 {
cea2e8a9 149 Perl_warner(aTHX_ WARN_UNSAFE,
77ca0c92
LW		 150 "\"%s\" variable %s masks earlier declaration in same %s",
151 (PL_in_my == KEY_our ? "our" : "my"),
152 name,
153 (SvIVX(sv) == PAD_MAX ? "scope" : "statement"));
b1cb66bf 154 break;
155 }
156 }
157 }
a0d0e21e
LW		 158 off = pad_alloc(OP_PADSV, SVs_PADMY);
159 sv = NEWSV(1102,0);
93a17b20
LW		 160 sv_upgrade(sv, SVt_PVNV);
161 sv_setpv(sv, name);
3280af22 162 if (PL_in_my_stash) {
c750a3ec 163 if (*name != '$')
cea2e8a9 164 yyerror(Perl_form(aTHX_ "Can't declare class for non-scalar %s in \"my\"",
dce40276 165 name));
c750a3ec
MB		 166 SvOBJECT_on(sv);
167 (void)SvUPGRADE(sv, SVt_PVMG);
3280af22
NIS		 168 SvSTASH(sv) = (HV*)SvREFCNT_inc(PL_in_my_stash);
169 PL_sv_objcount++;
c750a3ec 170 }
77ca0c92
LW		 171 if (PL_in_my == KEY_our)
172 SvFLAGS(sv) |= SVpad_OUR;
3280af22 173 av_store(PL_comppad_name, off, sv);
65202027 174 SvNVX(sv) = (NV)PAD_MAX;
8990e307 175 SvIVX(sv) = 0; /* Not yet introduced--see newSTATEOP */
3280af22
NIS		 176 if (!PL_min_intro_pending)
177 PL_min_intro_pending = off;
178 PL_max_intro_pending = off;
93a17b20 179 if (*name == '@')
3280af22 180 av_store(PL_comppad, off, (SV*)newAV());
93a17b20 181 else if (*name == '%')
3280af22
NIS		 182 av_store(PL_comppad, off, (SV*)newHV());
183 SvPADMY_on(PL_curpad[off]);
93a17b20
LW		 184 return off;
185}
186
2680586e
GS		 187#define FINDLEX_NOSEARCH 1 /* don't search outer contexts */
188
76e3520e 189STATIC PADOFFSET
cea2e8a9 190S_pad_findlex(pTHX_ char *name, PADOFFSET newoff, U32 seq, CV* startcv,
864dbfa3 191 I32 cx_ix, I32 saweval, U32 flags)
93a17b20 192{
11343788 193 dTHR;
748a9306 194 CV *cv;
93a17b20
LW		 195 I32 off;
196 SV *sv;
93a17b20 197 register I32 i;
c09156bb 198 register PERL_CONTEXT *cx;
93a17b20 199
748a9306 200 for (cv = startcv; cv; cv = CvOUTSIDE(cv)) {
4fdae800 201 AV *curlist = CvPADLIST(cv);
202 SV **svp = av_fetch(curlist, 0, FALSE);
748a9306 203 AV *curname;
4fdae800 204
3280af22 205 if (!svp || *svp == &PL_sv_undef)
4633a7c4 206 continue;
748a9306
LW		 207 curname = (AV*)*svp;
208 svp = AvARRAY(curname);
93965878 209 for (off = AvFILLp(curname); off > 0; off--) {
748a9306 210 if ((sv = svp[off]) &&
3280af22 211 sv != &PL_sv_undef &&
748a9306 212 seq <= SvIVX(sv) &&
13826f2c 213 seq > I_32(SvNVX(sv)) &&
748a9306
LW		 214 strEQ(SvPVX(sv), name))
215 {
5f05dabc 216 I32 depth;
217 AV *oldpad;
218 SV *oldsv;
219
220 depth = CvDEPTH(cv);
221 if (!depth) {
9607fc9c 222 if (newoff) {
223 if (SvFAKE(sv))
224 continue;
4fdae800 225 return 0; /* don't clone from inactive stack frame */
9607fc9c 226 }
5f05dabc 227 depth = 1;
228 }
229 oldpad = (AV*)*av_fetch(curlist, depth, FALSE);
230 oldsv = *av_fetch(oldpad, off, TRUE);
748a9306 231 if (!newoff) { /* Not a mere clone operation. */
9607fc9c 232 SV *namesv = NEWSV(1103,0);
748a9306 233 newoff = pad_alloc(OP_PADSV, SVs_PADMY);
9607fc9c 234 sv_upgrade(namesv, SVt_PVNV);
235 sv_setpv(namesv, name);
3280af22 236 av_store(PL_comppad_name, newoff, namesv);
65202027 237 SvNVX(namesv) = (NV)PL_curcop->cop_seq;
c53d7c7d 238 SvIVX(namesv) = PAD_MAX; /* A ref, intro immediately */
9607fc9c 239 SvFAKE_on(namesv); /* A ref, not a real var */
77ca0c92
LW		 240 if (SvFLAGS(sv) & SVpad_OUR)/* An "our" variable */
241 SvFLAGS(namesv) |= SVpad_OUR;
87671ffc 242 if (SvOBJECT(sv)) { /* A typed var */
3d93dc8b
GS		 243 SvOBJECT_on(namesv);
244 (void)SvUPGRADE(namesv, SVt_PVMG);
87671ffc 245 SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*)SvSTASH(sv));
3d93dc8b
GS		 246 PL_sv_objcount++;
247 }
3280af22 248 if (CvANON(PL_compcv) || SvTYPE(PL_compcv) == SVt_PVFM) {
28757baa 249 /* "It's closures all the way down." */
3280af22 250 CvCLONE_on(PL_compcv);
54310121 251 if (cv == startcv) {
3280af22 252 if (CvANON(PL_compcv))
54310121 253 oldsv = Nullsv; /* no need to keep ref */
254 }
255 else {
28757baa 256 CV *bcv;
257 for (bcv = startcv;
258 bcv && bcv != cv && !CvCLONE(bcv);
6b35e009
GS		 259 bcv = CvOUTSIDE(bcv))
260 {
28757baa 261 if (CvANON(bcv))
262 CvCLONE_on(bcv);
263 else {
6b35e009
GS		 264 if (ckWARN(WARN_CLOSURE)
265 && !CvUNIQUE(bcv) && !CvUNIQUE(cv))
266 {
cea2e8a9 267 Perl_warner(aTHX_ WARN_CLOSURE,
44a8e56a 268 "Variable \"%s\" may be unavailable",
28757baa 269 name);
6b35e009 270 }
28757baa 271 break;
272 }
273 }
274 }
275 }
3280af22 276 else if (!CvUNIQUE(PL_compcv)) {
599cee73 277 if (ckWARN(WARN_CLOSURE) && !SvFAKE(sv) && !CvUNIQUE(cv))
cea2e8a9 278 Perl_warner(aTHX_ WARN_CLOSURE,
599cee73 279 "Variable \"%s\" will not stay shared", name);
5f05dabc 280 }
748a9306 281 }
3280af22 282 av_store(PL_comppad, newoff, SvREFCNT_inc(oldsv));
748a9306
LW		 283 return newoff;
284 }
93a17b20
LW		 285 }
286 }
287
2680586e
GS		 288 if (flags & FINDLEX_NOSEARCH)
289 return 0;
290
93a17b20
LW		 291 /* Nothing in current lexical context--try eval's context, if any.
292 * This is necessary to let the perldb get at lexically scoped variables.
293 * XXX This will also probably interact badly with eval tree caching.
294 */
295
748a9306 296 for (i = cx_ix; i >= 0; i--) {
93a17b20 297 cx = &cxstack[i];
6b35e009 298 switch (CxTYPE(cx)) {
93a17b20 299 default:
748a9306
LW		 300 if (i == 0 && saweval) {
301 seq = cxstack[saweval].blk_oldcop->cop_seq;
2680586e 302 return pad_findlex(name, newoff, seq, PL_main_cv, -1, saweval, 0);
748a9306 303 }
93a17b20
LW		 304 break;
305 case CXt_EVAL:
44a8e56a 306 switch (cx->blk_eval.old_op_type) {
307 case OP_ENTEREVAL:
6b35e009
GS		 308 if (CxREALEVAL(cx))
309 saweval = i;
44a8e56a 310 break;
311 case OP_REQUIRE:
312 /* require must have its own scope */
313 return 0;
314 }
93a17b20
LW		 315 break;
316 case CXt_SUB:
317 if (!saweval)
318 return 0;
319 cv = cx->blk_sub.cv;
3280af22 320 if (PL_debstash && CvSTASH(cv) == PL_debstash) { /* ignore DB'* scope */
748a9306 321 saweval = i; /* so we know where we were called from */
93a17b20 322 continue;
93a17b20 323 }
748a9306 324 seq = cxstack[saweval].blk_oldcop->cop_seq;
2680586e 325 return pad_findlex(name, newoff, seq, cv, i-1, saweval,FINDLEX_NOSEARCH);
93a17b20
LW		 326 }
327 }
328
748a9306
LW		 329 return 0;
330}
a0d0e21e 331
748a9306 332PADOFFSET
864dbfa3 333Perl_pad_findmy(pTHX_ char *name)
748a9306 334{
11343788 335 dTHR;
748a9306 336 I32 off;
54310121 337 I32 pendoff = 0;
748a9306 338 SV *sv;
3280af22
NIS		 339 SV **svp = AvARRAY(PL_comppad_name);
340 U32 seq = PL_cop_seqmax;
6b35e009 341 PERL_CONTEXT *cx;
33b8ce05 342 CV *outside;
748a9306 343
11343788
MB		 344#ifdef USE_THREADS
345 /*
346 * Special case to get lexical (and hence per-thread) @_.
347 * XXX I need to find out how to tell at parse-time whether use
348 * of @_ should refer to a lexical (from a sub) or defgv (global
349 * scope and maybe weird sub-ish things like formats). See
350 * startsub in perly.y. It's possible that @_ could be lexical
351 * (at least from subs) even in non-threaded perl.
352 */
353 if (strEQ(name, "@_"))
354 return 0; /* success. (NOT_IN_PAD indicates failure) */
355#endif /* USE_THREADS */
356
748a9306 357 /* The one we're looking for is probably just before comppad_name_fill. */
3280af22 358 for (off = AvFILLp(PL_comppad_name); off > 0; off--) {
a0d0e21e 359 if ((sv = svp[off]) &&
3280af22 360 sv != &PL_sv_undef &&
54310121 361 (!SvIVX(sv) ||
362 (seq <= SvIVX(sv) &&
363 seq > I_32(SvNVX(sv)))) &&
a0d0e21e
LW		 364 strEQ(SvPVX(sv), name))
365 {
77ca0c92 366 if (SvIVX(sv) || SvFLAGS(sv) & SVpad_OUR)
54310121 367 return (PADOFFSET)off;
368 pendoff = off; /* this pending def. will override import */
a0d0e21e
LW		 369 }
370 }
748a9306 371
33b8ce05
GS		 372 outside = CvOUTSIDE(PL_compcv);
373
374 /* Check if if we're compiling an eval'', and adjust seq to be the
375 * eval's seq number. This depends on eval'' having a non-null
376 * CvOUTSIDE() while it is being compiled. The eval'' itself is
1aff0e91
GS		 377 * identified by CvEVAL being true and CvGV being null. */
378 if (outside && CvEVAL(PL_compcv) && !CvGV(PL_compcv) && cxstack_ix >= 0) {
6b35e009
GS		 379 cx = &cxstack[cxstack_ix];
380 if (CxREALEVAL(cx))
381 seq = cx->blk_oldcop->cop_seq;
382 }
383
748a9306 384 /* See if it's in a nested scope */
2680586e 385 off = pad_findlex(name, 0, seq, outside, cxstack_ix, 0, 0);
54310121 386 if (off) {
387 /* If there is a pending local definition, this new alias must die */
388 if (pendoff)
3280af22 389 SvIVX(AvARRAY(PL_comppad_name)[off]) = seq;
11343788 390 return off; /* pad_findlex returns 0 for failure...*/
54310121 391 }
11343788 392 return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */
93a17b20
LW		 393}
394
395void
864dbfa3 396Perl_pad_leavemy(pTHX_ I32 fill)
93a17b20 397{
0453d815 398 dTHR;
93a17b20 399 I32 off;
3280af22 400 SV **svp = AvARRAY(PL_comppad_name);
93a17b20 401 SV *sv;
3280af22
NIS		 402 if (PL_min_intro_pending && fill < PL_min_intro_pending) {
403 for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) {
0453d815
PM		 404 if ((sv = svp[off]) && sv != &PL_sv_undef && ckWARN_d(WARN_INTERNAL))
405 Perl_warner(aTHX_ WARN_INTERNAL, "%s never introduced", SvPVX(sv));
8990e307
LW		 406 }
407 }
408 /* "Deintroduce" my variables that are leaving with this scope. */
3280af22 409 for (off = AvFILLp(PL_comppad_name); off > fill; off--) {
c53d7c7d 410 if ((sv = svp[off]) && sv != &PL_sv_undef && SvIVX(sv) == PAD_MAX)
3280af22 411 SvIVX(sv) = PL_cop_seqmax;
93a17b20
LW		 412 }
413}
414
415PADOFFSET
864dbfa3 416Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype)
79072805 417{
11343788 418 dTHR;
79072805
LW		 419 SV *sv;
420 I32 retval;
421
3280af22 422 if (AvARRAY(PL_comppad) != PL_curpad)
cea2e8a9 423 Perl_croak(aTHX_ "panic: pad_alloc");
3280af22 424 if (PL_pad_reset_pending)
a0d0e21e 425 pad_reset();
ed6116ce 426 if (tmptype & SVs_PADMY) {
79072805 427 do {
3280af22 428 sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE);
ed6116ce 429 } while (SvPADBUSY(sv)); /* need a fresh one */
3280af22 430 retval = AvFILLp(PL_comppad);
79072805
LW		 431 }
432 else {
3280af22
NIS		 433 SV **names = AvARRAY(PL_comppad_name);
434 SSize_t names_fill = AvFILLp(PL_comppad_name);
bbce6d69 435 for (;;) {
436 /*
437 * "foreach" index vars temporarily become aliases to non-"my"
438 * values. Thus we must skip, not just pad values that are
439 * marked as current pad values, but also those with names.
440 */
3280af22
NIS		 441 if (++PL_padix <= names_fill &&
442 (sv = names[PL_padix]) && sv != &PL_sv_undef)
bbce6d69 443 continue;
3280af22 444 sv = *av_fetch(PL_comppad, PL_padix, TRUE);
bbce6d69 445 if (!(SvFLAGS(sv) & (SVs_PADTMP|SVs_PADMY)))
446 break;
447 }
3280af22 448 retval = PL_padix;
79072805 449 }
8990e307 450 SvFLAGS(sv) |= tmptype;
3280af22 451 PL_curpad = AvARRAY(PL_comppad);
11343788 452#ifdef USE_THREADS
5dc0d613 453 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx alloc %ld for %s\n",
533c011a 454 (unsigned long) thr, (unsigned long) PL_curpad,
22c35a8c 455 (long) retval, PL_op_name[optype]));
11343788 456#else
d9bb4600 457 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx alloc %ld for %s\n",
3280af22 458 (unsigned long) PL_curpad,
22c35a8c 459 (long) retval, PL_op_name[optype]));
11343788 460#endif /* USE_THREADS */
79072805
LW		 461 return (PADOFFSET)retval;
462}
463
464SV *
864dbfa3 465Perl_pad_sv(pTHX_ PADOFFSET po)
79072805 466{
11343788
MB		 467 dTHR;
468#ifdef USE_THREADS
5dc0d613 469 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx sv %d\n",
533c011a 470 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 471#else
79072805 472 if (!po)
cea2e8a9 473 Perl_croak(aTHX_ "panic: pad_sv po");
d9bb4600 474 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx sv %d\n",
3280af22 475 (unsigned long) PL_curpad, po));
11343788 476#endif /* USE_THREADS */
3280af22 477 return PL_curpad[po]; /* eventually we'll turn this into a macro */
79072805
LW		 478}
479
480void
864dbfa3 481Perl_pad_free(pTHX_ PADOFFSET po)
79072805 482{
11343788 483 dTHR;
3280af22 484 if (!PL_curpad)
a0d0e21e 485 return;
3280af22 486 if (AvARRAY(PL_comppad) != PL_curpad)
cea2e8a9 487 Perl_croak(aTHX_ "panic: pad_free curpad");
79072805 488 if (!po)
cea2e8a9 489 Perl_croak(aTHX_ "panic: pad_free po");
11343788 490#ifdef USE_THREADS
5dc0d613 491 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx free %d\n",
533c011a 492 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 493#else
d9bb4600 494 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx free %d\n",
3280af22 495 (unsigned long) PL_curpad, po));
11343788 496#endif /* USE_THREADS */
3280af22
NIS		 497 if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef)
498 SvPADTMP_off(PL_curpad[po]);
499 if ((I32)po < PL_padix)
500 PL_padix = po - 1;
79072805
LW		 501}
502
503void
864dbfa3 504Perl_pad_swipe(pTHX_ PADOFFSET po)
79072805 505{
11343788 506 dTHR;
3280af22 507 if (AvARRAY(PL_comppad) != PL_curpad)
cea2e8a9 508 Perl_croak(aTHX_ "panic: pad_swipe curpad");
79072805 509 if (!po)
cea2e8a9 510 Perl_croak(aTHX_ "panic: pad_swipe po");
11343788 511#ifdef USE_THREADS
5dc0d613 512 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx swipe %d\n",
533c011a 513 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 514#else
d9bb4600 515 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx swipe %d\n",
3280af22 516 (unsigned long) PL_curpad, po));
11343788 517#endif /* USE_THREADS */
3280af22
NIS		 518 SvPADTMP_off(PL_curpad[po]);
519 PL_curpad[po] = NEWSV(1107,0);
520 SvPADTMP_on(PL_curpad[po]);
521 if ((I32)po < PL_padix)
522 PL_padix = po - 1;
79072805
LW		 523}
524
d9bb4600
GS		 525/* XXX pad_reset() is currently disabled because it results in serious bugs.
526 * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed
527 * on the stack by OPs that use them, there are several ways to get an alias
528 * to a shared TARG. Such an alias will change randomly and unpredictably.
529 * We avoid doing this until we can think of a Better Way.
530 * GSAR 97-10-29 */
79072805 531void
864dbfa3 532Perl_pad_reset(pTHX)
79072805 533{
d9bb4600 534#ifdef USE_BROKEN_PAD_RESET
11343788 535 dTHR;
79072805
LW		 536 register I32 po;
537
6b88bc9c 538 if (AvARRAY(PL_comppad) != PL_curpad)
cea2e8a9 539 Perl_croak(aTHX_ "panic: pad_reset curpad");
11343788 540#ifdef USE_THREADS
5dc0d613 541 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx reset\n",
6b88bc9c 542 (unsigned long) thr, (unsigned long) PL_curpad));
11343788 543#else
d9bb4600 544 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx reset\n",
6b88bc9c 545 (unsigned long) PL_curpad));
11343788 546#endif /* USE_THREADS */
6b88bc9c
GS		 547 if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */
548 for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) {
549 if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po]))
550 SvPADTMP_off(PL_curpad[po]);
748a9306 551 }
6b88bc9c 552 PL_padix = PL_padix_floor;
79072805 553 }
d9bb4600 554#endif
3280af22 555 PL_pad_reset_pending = FALSE;
79072805
LW		 556}
557
a863c7d1 558#ifdef USE_THREADS
54b9620d 559/* find_threadsv is not reentrant */
a863c7d1 560PADOFFSET
864dbfa3 561Perl_find_threadsv(pTHX_ const char *name)
a863c7d1
MB		 562{
563 dTHR;
564 char *p;
565 PADOFFSET key;
554b3eca 566 SV **svp;
54b9620d 567 /* We currently only handle names of a single character */
533c011a 568 p = strchr(PL_threadsv_names, *name);
a863c7d1
MB		 569 if (!p)
570 return NOT_IN_PAD;
533c011a 571 key = p - PL_threadsv_names;
2d8e6c8d 572 MUTEX_LOCK(&thr->mutex);
54b9620d 573 svp = av_fetch(thr->threadsv, key, FALSE);
2d8e6c8d
GS		 574 if (svp)
575 MUTEX_UNLOCK(&thr->mutex);
576 else {
554b3eca 577 SV *sv = NEWSV(0, 0);
54b9620d 578 av_store(thr->threadsv, key, sv);
940cb80d 579 thr->threadsvp = AvARRAY(thr->threadsv);
2d8e6c8d 580 MUTEX_UNLOCK(&thr->mutex);
554b3eca
MB		 581 /*
582 * Some magic variables used to be automagically initialised
583 * in gv_fetchpv. Those which are now per-thread magicals get
584 * initialised here instead.
585 */
586 switch (*name) {
54b9620d
MB		 587 case '_':
588 break;
554b3eca
MB		 589 case ';':
590 sv_setpv(sv, "\034");
54b9620d 591 sv_magic(sv, 0, 0, name, 1);
554b3eca 592 break;
c277df42
IZ		 593 case '&':
594 case '`':
595 case '\'':
533c011a 596 PL_sawampersand = TRUE;
a3f914c5
GS		 597 /* FALL THROUGH */
598 case '1':
599 case '2':
600 case '3':
601 case '4':
602 case '5':
603 case '6':
604 case '7':
605 case '8':
606 case '9':
c277df42 607 SvREADONLY_on(sv);
d8b5173a 608 /* FALL THROUGH */
067391ea
GS		 609
610 /* XXX %! tied to Errno.pm needs to be added here.
611 * See gv_fetchpv(). */
612 /* case '!': */
613
54b9620d
MB		 614 default:
615 sv_magic(sv, 0, 0, name, 1);
554b3eca 616 }
bf49b057 617 DEBUG_S(PerlIO_printf(Perl_error_log,
54b9620d 618 "find_threadsv: new SV %p for $%s%c\n",
554b3eca
MB		 619 sv, (*name < 32) ? "^" : "",
620 (*name < 32) ? toCTRL(*name) : *name));
a863c7d1
MB		 621 }
622 return key;
623}
624#endif /* USE_THREADS */
625
79072805
LW		 626/* Destructor */
627
628void
864dbfa3 629Perl_op_free(pTHX_ OP *o)
79072805 630{
85e6fe83 631 register OP *kid, *nextkid;
acb36ea4 632 OPCODE type;
79072805 633
5dc0d613 634 if (!o || o->op_seq == (U16)-1)
79072805
LW		 635 return;
636
11343788
MB		 637 if (o->op_flags & OPf_KIDS) {
638 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 639 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 640 op_free(kid);
85e6fe83 641 }
79072805 642 }
acb36ea4
GS		 643 type = o->op_type;
644 if (type == OP_NULL)
645 type = o->op_targ;
646
647 /* COP* is not cleared by op_clear() so that we may track line
648 * numbers etc even after null() */
649 if (type == OP_NEXTSTATE || type == OP_SETSTATE || type == OP_DBSTATE)
650 cop_free((COP*)o);
651
652 op_clear(o);
653
654#ifdef PL_OP_SLAB_ALLOC
655 if ((char *) o == PL_OpPtr)
656 {
657 }
658#else
659 Safefree(o);
660#endif
661}
79072805 662
acb36ea4
GS		 663STATIC void
664S_op_clear(pTHX_ OP *o)
665{
11343788 666 switch (o->op_type) {
acb36ea4
GS		 667 case OP_NULL: /* Was holding old type, if any. */
668 case OP_ENTEREVAL: /* Was holding hints. */
669#ifdef USE_THREADS
670 case OP_THREADSV: /* Was holding index into thr->threadsv AV. */
671#endif
672 o->op_targ = 0;
a0d0e21e 673 break;
554b3eca 674#ifdef USE_THREADS
8dd3ba40
SM		 675 case OP_ENTERITER:
676 if (!(o->op_flags & OPf_SPECIAL))
677 break;
678 /* FALL THROUGH */
554b3eca 679#endif /* USE_THREADS */
a6006777 680 default:
ac4c12e7 681 if (!(o->op_flags & OPf_REF)
0b94c7bb 682 || (PL_check[o->op_type] != MEMBER_TO_FPTR(Perl_ck_ftst)))
a6006777 683 break;
684 /* FALL THROUGH */
463ee0b2 685 case OP_GVSV:
79072805 686 case OP_GV:
a6006777 687 case OP_AELEMFAST:
11343788 688 SvREFCNT_dec(cGVOPo->op_gv);
acb36ea4 689 cGVOPo->op_gv = Nullgv;
79072805
LW		 690 break;
691 case OP_CONST:
11343788 692 SvREFCNT_dec(cSVOPo->op_sv);
acb36ea4 693 cSVOPo->op_sv = Nullsv;
79072805 694 break;
748a9306
LW		 695 case OP_GOTO:
696 case OP_NEXT:
697 case OP_LAST:
698 case OP_REDO:
11343788 699 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 700 break;
701 /* FALL THROUGH */
a0d0e21e 702 case OP_TRANS:
acb36ea4 703 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
a0ed51b3 704 SvREFCNT_dec(cSVOPo->op_sv);
acb36ea4
GS		 705 cSVOPo->op_sv = Nullsv;
706 }
707 else {
a0ed51b3 708 Safefree(cPVOPo->op_pv);
acb36ea4
GS		 709 cPVOPo->op_pv = Nullch;
710 }
a0d0e21e
LW		 711 break;
712 case OP_SUBST:
11343788 713 op_free(cPMOPo->op_pmreplroot);
acb36ea4 714 cPMOPo->op_pmreplroot = Nullop;
a0d0e21e 715 /* FALL THROUGH */
748a9306 716 case OP_PUSHRE:
a0d0e21e 717 case OP_MATCH:
8782bef2 718 case OP_QR:
c277df42 719 ReREFCNT_dec(cPMOPo->op_pmregexp);
acb36ea4 720 cPMOPo->op_pmregexp = (REGEXP*)NULL;
a0d0e21e 721 break;
79072805
LW		 722 }
723
11343788
MB		 724 if (o->op_targ > 0)
725 pad_free(o->op_targ);
79072805
LW		 726}
727
76e3520e 728STATIC void
3eb57f73
HS		 729S_cop_free(pTHX_ COP* cop)
730{
731 Safefree(cop->cop_label);
732 SvREFCNT_dec(cop->cop_filegv);
0453d815 733 if (! specialWARN(cop->cop_warnings))
3eb57f73
HS		 734 SvREFCNT_dec(cop->cop_warnings);
735}
736
737STATIC void
cea2e8a9 738S_null(pTHX_ OP *o)
8990e307 739{
acb36ea4
GS		 740 if (o->op_type == OP_NULL)
741 return;
742 op_clear(o);
11343788
MB		 743 o->op_targ = o->op_type;
744 o->op_type = OP_NULL;
22c35a8c 745 o->op_ppaddr = PL_ppaddr[OP_NULL];
8990e307
LW		 746}
747
79072805
LW		 748/* Contextualizers */
749
463ee0b2 750#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 751
752OP *
864dbfa3 753Perl_linklist(pTHX_ OP *o)
79072805
LW		 754{
755 register OP *kid;
756
11343788
MB		 757 if (o->op_next)
758 return o->op_next;
79072805
LW		 759
760 /* establish postfix order */
11343788
MB		 761 if (cUNOPo->op_first) {
762 o->op_next = LINKLIST(cUNOPo->op_first);
763 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 764 if (kid->op_sibling)
765 kid->op_next = LINKLIST(kid->op_sibling);
766 else
11343788 767 kid->op_next = o;
79072805
LW		 768 }
769 }
770 else
11343788 771 o->op_next = o;
79072805 772
11343788 773 return o->op_next;
79072805
LW		 774}
775
776OP *
864dbfa3 777Perl_scalarkids(pTHX_ OP *o)
79072805
LW		 778{
779 OP *kid;
11343788
MB		 780 if (o && o->op_flags & OPf_KIDS) {
781 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 782 scalar(kid);
783 }
11343788 784 return o;
79072805
LW		 785}
786
76e3520e 787STATIC OP *
cea2e8a9 788S_scalarboolean(pTHX_ OP *o)
8990e307 789{
d008e5eb 790 if (o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
0f15f207 791 dTHR;
d008e5eb
GS		 792 if (ckWARN(WARN_SYNTAX)) {
793 line_t oldline = PL_curcop->cop_line;
a0d0e21e 794
d008e5eb
GS		 795 if (PL_copline != NOLINE)
796 PL_curcop->cop_line = PL_copline;
cea2e8a9 797 Perl_warner(aTHX_ WARN_SYNTAX, "Found = in conditional, should be ==");
d008e5eb
GS		 798 PL_curcop->cop_line = oldline;
799 }
a0d0e21e 800 }
11343788 801 return scalar(o);
8990e307
LW		 802}
803
804OP *
864dbfa3 805Perl_scalar(pTHX_ OP *o)
79072805
LW		 806{
807 OP *kid;
808
a0d0e21e 809 /* assumes no premature commitment */
3280af22 810 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 811 || o->op_type == OP_RETURN)
11343788 812 return o;
79072805 813
b162f9ea
IZ		 814 if ((o->op_private & OPpTARGET_MY)
815 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
816 return scalar(o); /* As if inside SASSIGN */
817
5dc0d613 818 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 819
11343788 820 switch (o->op_type) {
79072805 821 case OP_REPEAT:
11343788
MB		 822 if (o->op_private & OPpREPEAT_DOLIST)
823 null(((LISTOP*)cBINOPo->op_first)->op_first);
824 scalar(cBINOPo->op_first);
8990e307 825 break;
79072805
LW		 826 case OP_OR:
827 case OP_AND:
828 case OP_COND_EXPR:
11343788 829 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 830 scalar(kid);
79072805 831 break;
a0d0e21e 832 case OP_SPLIT:
11343788 833 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 834 if (!kPMOP->op_pmreplroot)
835 deprecate("implicit split to @_");
836 }
837 /* FALL THROUGH */
79072805 838 case OP_MATCH:
8782bef2 839 case OP_QR:
79072805
LW		 840 case OP_SUBST:
841 case OP_NULL:
8990e307 842 default:
11343788
MB		 843 if (o->op_flags & OPf_KIDS) {
844 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 845 scalar(kid);
846 }
79072805
LW		 847 break;
848 case OP_LEAVE:
849 case OP_LEAVETRY:
5dc0d613 850 kid = cLISTOPo->op_first;
54310121 851 scalar(kid);
852 while (kid = kid->op_sibling) {
853 if (kid->op_sibling)
854 scalarvoid(kid);
855 else
856 scalar(kid);
857 }
3280af22 858 WITH_THR(PL_curcop = &PL_compiling);
54310121 859 break;
748a9306 860 case OP_SCOPE:
79072805 861 case OP_LINESEQ:
8990e307 862 case OP_LIST:
11343788 863 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 864 if (kid->op_sibling)
865 scalarvoid(kid);
866 else
867 scalar(kid);
868 }
3280af22 869 WITH_THR(PL_curcop = &PL_compiling);
79072805
LW		 870 break;
871 }
11343788 872 return o;
79072805
LW		 873}
874
875OP *
864dbfa3 876Perl_scalarvoid(pTHX_ OP *o)
79072805
LW		 877{
878 OP *kid;
8990e307
LW		 879 char* useless = 0;
880 SV* sv;
2ebea0a1
GS		 881 U8 want;
882
acb36ea4
GS		 883 if (o->op_type == OP_NEXTSTATE
884 || o->op_type == OP_SETSTATE
885 || o->op_type == OP_DBSTATE
886 || (o->op_type == OP_NULL && (o->op_targ == OP_NEXTSTATE
887 || o->op_targ == OP_SETSTATE
888 || o->op_targ == OP_DBSTATE)))
2ebea0a1
GS		 889 {
890 dTHR;
891 PL_curcop = (COP*)o; /* for warning below */
892 }
79072805 893
54310121 894 /* assumes no premature commitment */
2ebea0a1
GS		 895 want = o->op_flags & OPf_WANT;
896 if ((want && want != OPf_WANT_SCALAR) || PL_error_count
5dc0d613 897 || o->op_type == OP_RETURN)
11343788 898 return o;
79072805 899
b162f9ea
IZ		 900 if ((o->op_private & OPpTARGET_MY)
901 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
902 return scalar(o); /* As if inside SASSIGN */
903
5dc0d613 904 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 905
11343788 906 switch (o->op_type) {
79072805 907 default:
22c35a8c 908 if (!(PL_opargs[o->op_type] & OA_FOLDCONST))
8990e307 909 break;
36477c24 910 /* FALL THROUGH */
911 case OP_REPEAT:
11343788 912 if (o->op_flags & OPf_STACKED)
8990e307 913 break;
5d82c453
GA		 914 goto func_ops;
915 case OP_SUBSTR:
916 if (o->op_private == 4)
917 break;
8990e307
LW		 918 /* FALL THROUGH */
919 case OP_GVSV:
920 case OP_WANTARRAY:
921 case OP_GV:
922 case OP_PADSV:
923 case OP_PADAV:
924 case OP_PADHV:
925 case OP_PADANY:
926 case OP_AV2ARYLEN:
8990e307 927 case OP_REF:
a0d0e21e
LW		 928 case OP_REFGEN:
929 case OP_SREFGEN:
8990e307
LW		 930 case OP_DEFINED:
931 case OP_HEX:
932 case OP_OCT:
933 case OP_LENGTH:
8990e307
LW		 934 case OP_VEC:
935 case OP_INDEX:
936 case OP_RINDEX:
937 case OP_SPRINTF:
938 case OP_AELEM:
939 case OP_AELEMFAST:
940 case OP_ASLICE:
8990e307
LW		 941 case OP_HELEM:
942 case OP_HSLICE:
943 case OP_UNPACK:
944 case OP_PACK:
8990e307
LW		 945 case OP_JOIN:
946 case OP_LSLICE:
947 case OP_ANONLIST:
948 case OP_ANONHASH:
949 case OP_SORT:
950 case OP_REVERSE:
951 case OP_RANGE:
952 case OP_FLIP:
953 case OP_FLOP:
954 case OP_CALLER:
955 case OP_FILENO:
956 case OP_EOF:
957 case OP_TELL:
958 case OP_GETSOCKNAME:
959 case OP_GETPEERNAME:
960 case OP_READLINK:
961 case OP_TELLDIR:
962 case OP_GETPPID:
963 case OP_GETPGRP:
964 case OP_GETPRIORITY:
965 case OP_TIME:
966 case OP_TMS:
967 case OP_LOCALTIME:
968 case OP_GMTIME:
969 case OP_GHBYNAME:
970 case OP_GHBYADDR:
971 case OP_GHOSTENT:
972 case OP_GNBYNAME:
973 case OP_GNBYADDR:
974 case OP_GNETENT:
975 case OP_GPBYNAME:
976 case OP_GPBYNUMBER:
977 case OP_GPROTOENT:
978 case OP_GSBYNAME:
979 case OP_GSBYPORT:
980 case OP_GSERVENT:
981 case OP_GPWNAM:
982 case OP_GPWUID:
983 case OP_GGRNAM:
984 case OP_GGRGID:
985 case OP_GETLOGIN:
5d82c453 986 func_ops:
11343788 987 if (!(o->op_private & OPpLVAL_INTRO))
22c35a8c 988 useless = PL_op_desc[o->op_type];
8990e307
LW		 989 break;
990
991 case OP_RV2GV:
992 case OP_RV2SV:
993 case OP_RV2AV:
994 case OP_RV2HV:
11343788
MB		 995 if (!(o->op_private & OPpLVAL_INTRO) &&
996 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 997 useless = "a variable";
998 break;
79072805
LW		 999
1000 case OP_CONST:
11343788 1001 sv = cSVOPo->op_sv;
7a52d87a
GS		 1002 if (cSVOPo->op_private & OPpCONST_STRICT)
1003 no_bareword_allowed(o);
1004 else {
d008e5eb
GS		 1005 dTHR;
1006 if (ckWARN(WARN_VOID)) {
1007 useless = "a constant";
1008 if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
1009 useless = 0;
1010 else if (SvPOK(sv)) {
1011 if (strnEQ(SvPVX(sv), "di", 2) ||
1012 strnEQ(SvPVX(sv), "ds", 2) ||
1013 strnEQ(SvPVX(sv), "ig", 2))
1014 useless = 0;
1015 }
8990e307
LW		 1016 }
1017 }
acb36ea4 1018 null(o); /* don't execute or even remember it */
79072805
LW		 1019 break;
1020
1021 case OP_POSTINC:
11343788 1022 o->op_type = OP_PREINC; /* pre-increment is faster */
22c35a8c 1023 o->op_ppaddr = PL_ppaddr[OP_PREINC];
79072805
LW		 1024 break;
1025
1026 case OP_POSTDEC:
11343788 1027 o->op_type = OP_PREDEC; /* pre-decrement is faster */
22c35a8c 1028 o->op_ppaddr = PL_ppaddr[OP_PREDEC];
79072805
LW		 1029 break;
1030
79072805
LW		 1031 case OP_OR:
1032 case OP_AND:
1033 case OP_COND_EXPR:
11343788 1034 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 1035 scalarvoid(kid);
1036 break;
5aabfad6 1037
a0d0e21e 1038 case OP_NULL:
11343788 1039 if (o->op_flags & OPf_STACKED)
a0d0e21e 1040 break;
5aabfad6 1041 /* FALL THROUGH */
2ebea0a1
GS		 1042 case OP_NEXTSTATE:
1043 case OP_DBSTATE:
79072805
LW		 1044 case OP_ENTERTRY:
1045 case OP_ENTER:
1046 case OP_SCALAR:
11343788 1047 if (!(o->op_flags & OPf_KIDS))
79072805 1048 break;
54310121 1049 /* FALL THROUGH */
463ee0b2 1050 case OP_SCOPE:
79072805
LW		 1051 case OP_LEAVE:
1052 case OP_LEAVETRY:
a0d0e21e 1053 case OP_LEAVELOOP:
79072805 1054 case OP_LINESEQ:
79072805 1055 case OP_LIST:
11343788 1056 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 1057 scalarvoid(kid);
1058 break;
c90c0ff4 1059 case OP_ENTEREVAL:
5196be3e 1060 scalarkids(o);
c90c0ff4 1061 break;
5aabfad6 1062 case OP_REQUIRE:
c90c0ff4 1063 /* all requires must return a boolean value */
5196be3e
MB		 1064 o->op_flags &= ~OPf_WANT;
1065 return scalar(o);
a0d0e21e 1066 case OP_SPLIT:
11343788 1067 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 1068 if (!kPMOP->op_pmreplroot)
1069 deprecate("implicit split to @_");
1070 }
1071 break;
79072805 1072 }
d008e5eb
GS		 1073 if (useless) {
1074 dTHR;
1075 if (ckWARN(WARN_VOID))
cea2e8a9 1076 Perl_warner(aTHX_ WARN_VOID, "Useless use of %s in void context", useless);
d008e5eb 1077 }
11343788 1078 return o;
79072805
LW		 1079}
1080
1081OP *
864dbfa3 1082Perl_listkids(pTHX_ OP *o)
79072805
LW		 1083{
1084 OP *kid;
11343788
MB		 1085 if (o && o->op_flags & OPf_KIDS) {
1086 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 1087 list(kid);
1088 }
11343788 1089 return o;
79072805
LW		 1090}
1091
1092OP *
864dbfa3 1093Perl_list(pTHX_ OP *o)
79072805
LW		 1094{
1095 OP *kid;
1096
a0d0e21e 1097 /* assumes no premature commitment */
3280af22 1098 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 1099 || o->op_type == OP_RETURN)
11343788 1100 return o;
79072805 1101
b162f9ea
IZ		 1102 if ((o->op_private & OPpTARGET_MY)
1103 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
1104 return o; /* As if inside SASSIGN */
1105
5dc0d613 1106 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 1107
11343788 1108 switch (o->op_type) {
79072805
LW		 1109 case OP_FLOP:
1110 case OP_REPEAT:
11343788 1111 list(cBINOPo->op_first);
79072805
LW		 1112 break;
1113 case OP_OR:
1114 case OP_AND:
1115 case OP_COND_EXPR:
11343788 1116 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 1117 list(kid);
1118 break;
1119 default:
1120 case OP_MATCH:
8782bef2 1121 case OP_QR:
79072805
LW		 1122 case OP_SUBST:
1123 case OP_NULL:
11343788 1124 if (!(o->op_flags & OPf_KIDS))
79072805 1125 break;
11343788
MB		 1126 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
1127 list(cBINOPo->op_first);
1128 return gen_constant_list(o);
79072805
LW		 1129 }
1130 case OP_LIST:
11343788 1131 listkids(o);
79072805
LW		 1132 break;
1133 case OP_LEAVE:
1134 case OP_LEAVETRY:
5dc0d613 1135 kid = cLISTOPo->op_first;
54310121 1136 list(kid);
1137 while (kid = kid->op_sibling) {
1138 if (kid->op_sibling)
1139 scalarvoid(kid);
1140 else
1141 list(kid);
1142 }
3280af22 1143 WITH_THR(PL_curcop = &PL_compiling);
54310121 1144 break;
748a9306 1145 case OP_SCOPE:
79072805 1146 case OP_LINESEQ:
11343788 1147 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 1148 if (kid->op_sibling)
1149 scalarvoid(kid);
1150 else
1151 list(kid);
1152 }
3280af22 1153 WITH_THR(PL_curcop = &PL_compiling);
79072805 1154 break;
c90c0ff4 1155 case OP_REQUIRE:
1156 /* all requires must return a boolean value */
5196be3e
MB		 1157 o->op_flags &= ~OPf_WANT;
1158 return scalar(o);
79072805 1159 }
11343788 1160 return o;
79072805
LW		 1161}
1162
1163OP *
864dbfa3 1164Perl_scalarseq(pTHX_ OP *o)
79072805
LW		 1165{
1166 OP *kid;
1167
11343788
MB		 1168 if (o) {
1169 if (o->op_type == OP_LINESEQ ||
1170 o->op_type == OP_SCOPE ||
1171 o->op_type == OP_LEAVE ||
1172 o->op_type == OP_LEAVETRY)
463ee0b2 1173 {
0f15f207 1174 dTHR;
11343788 1175 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 1176 if (kid->op_sibling) {
463ee0b2 1177 scalarvoid(kid);
ed6116ce 1178 }
463ee0b2 1179 }
3280af22 1180 PL_curcop = &PL_compiling;
79072805 1181 }
11343788 1182 o->op_flags &= ~OPf_PARENS;
3280af22 1183 if (PL_hints & HINT_BLOCK_SCOPE)
11343788 1184 o->op_flags |= OPf_PARENS;
79072805 1185 }
8990e307 1186 else
11343788
MB		 1187 o = newOP(OP_STUB, 0);
1188 return o;
79072805
LW		 1189}
1190
76e3520e 1191STATIC OP *
cea2e8a9 1192S_modkids(pTHX_ OP *o, I32 type)
79072805
LW		 1193{
1194 OP *kid;
11343788
MB		 1195 if (o && o->op_flags & OPf_KIDS) {
1196 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 1197 mod(kid, type);
79072805 1198 }
11343788 1199 return o;
79072805
LW		 1200}
1201
79072805 1202OP *
864dbfa3 1203Perl_mod(pTHX_ OP *o, I32 type)
79072805 1204{
11343788 1205 dTHR;
79072805
LW		 1206 OP *kid;
1207 SV *sv;
2d8e6c8d 1208 STRLEN n_a;
79072805 1209
3280af22 1210 if (!o || PL_error_count)
11343788 1211 return o;
79072805 1212
b162f9ea
IZ		 1213 if ((o->op_private & OPpTARGET_MY)
1214 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
1215 return o;
1216
11343788 1217 switch (o->op_type) {
68dc0745 1218 case OP_UNDEF:
3280af22 1219 PL_modcount++;
5dc0d613 1220 return o;
a0d0e21e 1221 case OP_CONST:
11343788 1222 if (!(o->op_private & (OPpCONST_ARYBASE)))
a0d0e21e 1223 goto nomod;
3280af22
NIS		 1224 if (PL_eval_start && PL_eval_start->op_type == OP_CONST) {
1225 PL_compiling.cop_arybase = (I32)SvIV(((SVOP*)PL_eval_start)->op_sv);
1226 PL_eval_start = 0;
a0d0e21e
LW		 1227 }
1228 else if (!type) {
3280af22
NIS		 1229 SAVEI32(PL_compiling.cop_arybase);
1230 PL_compiling.cop_arybase = 0;
a0d0e21e
LW		 1231 }
1232 else if (type == OP_REFGEN)
1233 goto nomod;
1234 else
cea2e8a9 1235 Perl_croak(aTHX_ "That use of $[ is unsupported");
a0d0e21e 1236 break;
5f05dabc 1237 case OP_STUB:
5196be3e 1238 if (o->op_flags & OPf_PARENS)
5f05dabc 1239 break;
1240 goto nomod;
a0d0e21e
LW		 1241 case OP_ENTERSUB:
1242 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1243 !(o->op_flags & OPf_STACKED)) {
1244 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1245 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788
MB		 1246 assert(cUNOPo->op_first->op_type == OP_NULL);
1247 null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1248 break;
1249 }
cd06dffe
GS		 1250 else { /* lvalue subroutine call */
1251 o->op_private |= OPpLVAL_INTRO;
1252 if (type == OP_GREPSTART || type == OP_ENTERSUB) {
1253 /* Backward compatibility mode: */
1254 o->op_private |= OPpENTERSUB_INARGS;
1255 break;
1256 }
1257 else { /* Compile-time error message: */
1258 OP *kid = cUNOPo->op_first;
1259 CV *cv;
1260 OP *okid;
1261
1262 if (kid->op_type == OP_PUSHMARK)
1263 goto skip_kids;
1264 if (kid->op_type != OP_NULL || kid->op_targ != OP_LIST)
1265 Perl_croak(aTHX_
1266 "panic: unexpected lvalue entersub "
1267 "args: type/targ %ld:%ld",
1268 (long)kid->op_type,kid->op_targ);
1269 kid = kLISTOP->op_first;
1270 skip_kids:
1271 while (kid->op_sibling)
1272 kid = kid->op_sibling;
1273 if (!(kid->op_type == OP_NULL && kid->op_targ == OP_RV2CV)) {
1274 /* Indirect call */
1275 if (kid->op_type == OP_METHOD_NAMED
1276 || kid->op_type == OP_METHOD)
1277 {
349fd7b7 1278 OP *newop;
cd06dffe
GS		 1279
1280 if (kid->op_sibling || kid->op_next != kid) {
1281 yyerror("panic: unexpected optree near method call");
1282 break;
1283 }
1284
349fd7b7
GS		 1285 NewOp(1101, newop, 1, OP);
1286 newop->op_type = OP_RV2CV;
1287 newop->op_ppaddr = PL_ppaddr[OP_RV2CV];
1288 newop->op_next = newop;
1289 kid->op_sibling = newop;
1290 newop->op_private |= OPpLVAL_INTRO;
cd06dffe
GS		 1291 break;
1292 }
1293
1294 if (kid->op_type != OP_RV2CV)
1295 Perl_croak(aTHX_
1296 "panic: unexpected lvalue entersub "
1297 "entry via type/targ %ld:%ld",
1298 (long)kid->op_type,kid->op_targ);
1299 kid->op_private |= OPpLVAL_INTRO;
1300 break; /* Postpone until runtime */
1301 }
1302
1303 okid = kid;
1304 kid = kUNOP->op_first;
1305 if (kid->op_type == OP_NULL && kid->op_targ == OP_RV2SV)
1306 kid = kUNOP->op_first;
1307 if (kid->op_type == OP_NULL)
1308 Perl_croak(aTHX_
1309 "Unexpected constant lvalue entersub "
1310 "entry via type/targ %ld:%ld",
1311 (long)kid->op_type,kid->op_targ);
1312 if (kid->op_type != OP_GV) {
1313 /* Restore RV2CV to check lvalueness */
1314 restore_2cv:
1315 if (kid->op_next && kid->op_next != kid) { /* Happens? */
1316 okid->op_next = kid->op_next;
1317 kid->op_next = okid;
1318 }
1319 else
1320 okid->op_next = Nullop;
1321 okid->op_type = OP_RV2CV;
1322 okid->op_targ = 0;
1323 okid->op_ppaddr = PL_ppaddr[OP_RV2CV];
1324 okid->op_private |= OPpLVAL_INTRO;
1325 break;
1326 }
1327
1328 cv = GvCV(kGVOP->op_gv);
1329 if (!cv)
1330 goto restore_2cv;
1331 if (CvLVALUE(cv))
1332 break;
1333 }
1334 }
79072805
LW		 1335 /* FALL THROUGH */
1336 default:
a0d0e21e
LW		 1337 nomod:
1338 /* grep, foreach, subcalls, refgen */
1339 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
1340 break;
cea2e8a9 1341 yyerror(Perl_form(aTHX_ "Can't modify %s in %s",
638bc118 1342 (o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL)
cd06dffe
GS		 1343 ? "do block"
1344 : (o->op_type == OP_ENTERSUB
1345 ? "non-lvalue subroutine call"
1346 : PL_op_desc[o->op_type])),
22c35a8c 1347 type ? PL_op_desc[type] : "local"));
11343788 1348 return o;
79072805 1349
a0d0e21e
LW		 1350 case OP_PREINC:
1351 case OP_PREDEC:
1352 case OP_POW:
1353 case OP_MULTIPLY:
1354 case OP_DIVIDE:
1355 case OP_MODULO:
1356 case OP_REPEAT:
1357 case OP_ADD:
1358 case OP_SUBTRACT:
1359 case OP_CONCAT:
1360 case OP_LEFT_SHIFT:
1361 case OP_RIGHT_SHIFT:
1362 case OP_BIT_AND:
1363 case OP_BIT_XOR:
1364 case OP_BIT_OR:
1365 case OP_I_MULTIPLY:
1366 case OP_I_DIVIDE:
1367 case OP_I_MODULO:
1368 case OP_I_ADD:
1369 case OP_I_SUBTRACT:
11343788 1370 if (!(o->op_flags & OPf_STACKED))
a0d0e21e 1371 goto nomod;
3280af22 1372 PL_modcount++;
a0d0e21e
LW		 1373 break;
1374
79072805 1375 case OP_COND_EXPR:
11343788 1376 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1377 mod(kid, type);
79072805
LW		 1378 break;
1379
1380 case OP_RV2AV:
1381 case OP_RV2HV:
93af7a87 1382 if (!type && cUNOPo->op_first->op_type != OP_GV)
cea2e8a9 1383 Perl_croak(aTHX_ "Can't localize through a reference");
11343788 1384 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
3280af22 1385 PL_modcount = 10000;
11343788 1386 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1387 }
1388 /* FALL THROUGH */
79072805 1389 case OP_RV2GV:
5dc0d613 1390 if (scalar_mod_type(o, type))
3fe9a6f1 1391 goto nomod;
11343788 1392 ref(cUNOPo->op_first, o->op_type);
79072805
LW		 1393 /* FALL THROUGH */
1394 case OP_AASSIGN:
1395 case OP_ASLICE:
1396 case OP_HSLICE:
93a17b20
LW		 1397 case OP_NEXTSTATE:
1398 case OP_DBSTATE:
a0d0e21e
LW		 1399 case OP_REFGEN:
1400 case OP_CHOMP:
3280af22 1401 PL_modcount = 10000;
79072805 1402 break;
463ee0b2 1403 case OP_RV2SV:
11343788 1404 if (!type && cUNOPo->op_first->op_type != OP_GV)
cea2e8a9 1405 Perl_croak(aTHX_ "Can't localize through a reference");
aeea060c 1406 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1407 /* FALL THROUGH */
79072805 1408 case OP_GV:
463ee0b2 1409 case OP_AV2ARYLEN:
3280af22 1410 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1411 case OP_SASSIGN:
bf4b1e52
GS		 1412 case OP_ANDASSIGN:
1413 case OP_ORASSIGN:
8990e307 1414 case OP_AELEMFAST:
3280af22 1415 PL_modcount++;
8990e307
LW		 1416 break;
1417
748a9306
LW		 1418 case OP_PADAV:
1419 case OP_PADHV:
3280af22 1420 PL_modcount = 10000;
5196be3e
MB		 1421 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1422 return o; /* Treat \(@foo) like ordinary list. */
1423 if (scalar_mod_type(o, type))
3fe9a6f1 1424 goto nomod;
748a9306
LW		 1425 /* FALL THROUGH */
1426 case OP_PADSV:
3280af22 1427 PL_modcount++;
748a9306 1428 if (!type)
cea2e8a9 1429 Perl_croak(aTHX_ "Can't localize lexical variable %s",
2d8e6c8d 1430 SvPV(*av_fetch(PL_comppad_name, o->op_targ, 4), n_a));
463ee0b2
LW		 1431 break;
1432
554b3eca 1433#ifdef USE_THREADS
2faa37cc 1434 case OP_THREADSV:
533c011a 1435 PL_modcount++; /* XXX ??? */
554b3eca
MB		 1436 break;
1437#endif /* USE_THREADS */
1438
748a9306
LW		 1439 case OP_PUSHMARK:
1440 break;
a0d0e21e 1441
69969c6f
SB		 1442 case OP_KEYS:
1443 if (type != OP_SASSIGN)
1444 goto nomod;
5d82c453
GA		 1445 goto lvalue_func;
1446 case OP_SUBSTR:
1447 if (o->op_private == 4) /* don't allow 4 arg substr as lvalue */
1448 goto nomod;
5f05dabc 1449 /* FALL THROUGH */
a0d0e21e 1450 case OP_POS:
463ee0b2 1451 case OP_VEC:
5d82c453 1452 lvalue_func:
11343788
MB		 1453 pad_free(o->op_targ);
1454 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1455 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1456 if (o->op_flags & OPf_KIDS)
1457 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1458 break;
a0d0e21e 1459
463ee0b2
LW		 1460 case OP_AELEM:
1461 case OP_HELEM:
11343788 1462 ref(cBINOPo->op_first, o->op_type);
68dc0745 1463 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1464 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1465 o->op_private |= OPpLVAL_DEFER;
3280af22 1466 PL_modcount++;
463ee0b2
LW		 1467 break;
1468
1469 case OP_SCOPE:
1470 case OP_LEAVE:
1471 case OP_ENTER:
11343788
MB		 1472 if (o->op_flags & OPf_KIDS)
1473 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1474 break;
1475
1476 case OP_NULL:
638bc118
GS		 1477 if (o->op_flags & OPf_SPECIAL) /* do BLOCK */
1478 goto nomod;
1479 else if (!(o->op_flags & OPf_KIDS))
463ee0b2 1480 break;
11343788
MB		 1481 if (o->op_targ != OP_LIST) {
1482 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1483 break;
1484 }
1485 /* FALL THROUGH */
463ee0b2 1486 case OP_LIST:
11343788 1487 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1488 mod(kid, type);
1489 break;
1490 }
11343788 1491 o->op_flags |= OPf_MOD;
a0d0e21e
LW		 1492
1493 if (type == OP_AASSIGN || type == OP_SASSIGN)
11343788 1494 o->op_flags |= OPf_SPECIAL|OPf_REF;
a0d0e21e 1495 else if (!type) {
11343788
MB		 1496 o->op_private |= OPpLVAL_INTRO;
1497 o->op_flags &= ~OPf_SPECIAL;
3280af22 1498 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1499 }
a0d0e21e 1500 else if (type != OP_GREPSTART && type != OP_ENTERSUB)
11343788
MB		 1501 o->op_flags |= OPf_REF;
1502 return o;
463ee0b2
LW		 1503}
1504
864dbfa3 1505STATIC bool
cea2e8a9 1506S_scalar_mod_type(pTHX_ OP *o, I32 type)
3fe9a6f1 1507{
1508 switch (type) {
1509 case OP_SASSIGN:
5196be3e 1510 if (o->op_type == OP_RV2GV)
3fe9a6f1 1511 return FALSE;
1512 /* FALL THROUGH */
1513 case OP_PREINC:
1514 case OP_PREDEC:
1515 case OP_POSTINC:
1516 case OP_POSTDEC:
1517 case OP_I_PREINC:
1518 case OP_I_PREDEC:
1519 case OP_I_POSTINC:
1520 case OP_I_POSTDEC:
1521 case OP_POW:
1522 case OP_MULTIPLY:
1523 case OP_DIVIDE:
1524 case OP_MODULO:
1525 case OP_REPEAT:
1526 case OP_ADD:
1527 case OP_SUBTRACT:
1528 case OP_I_MULTIPLY:
1529 case OP_I_DIVIDE:
1530 case OP_I_MODULO:
1531 case OP_I_ADD:
1532 case OP_I_SUBTRACT:
1533 case OP_LEFT_SHIFT:
1534 case OP_RIGHT_SHIFT:
1535 case OP_BIT_AND:
1536 case OP_BIT_XOR:
1537 case OP_BIT_OR:
1538 case OP_CONCAT:
1539 case OP_SUBST:
1540 case OP_TRANS:
49e9fbe6
GS		 1541 case OP_READ:
1542 case OP_SYSREAD:
1543 case OP_RECV:
bf4b1e52
GS		 1544 case OP_ANDASSIGN:
1545 case OP_ORASSIGN:
3fe9a6f1 1546 return TRUE;
1547 default:
1548 return FALSE;
1549 }
1550}
1551
35cd451c 1552STATIC bool
cea2e8a9 1553S_is_handle_constructor(pTHX_ OP *o, I32 argnum)
35cd451c
GS		 1554{
1555 switch (o->op_type) {
1556 case OP_PIPE_OP:
1557 case OP_SOCKPAIR:
1558 if (argnum == 2)
1559 return TRUE;
1560 /* FALL THROUGH */
1561 case OP_SYSOPEN:
1562 case OP_OPEN:
ded8aa31 1563 case OP_SELECT: /* XXX c.f. SelectSaver.pm */
35cd451c
GS		 1564 case OP_SOCKET:
1565 case OP_OPEN_DIR:
1566 case OP_ACCEPT:
1567 if (argnum == 1)
1568 return TRUE;
1569 /* FALL THROUGH */
1570 default:
1571 return FALSE;
1572 }
1573}
1574
463ee0b2 1575OP *
864dbfa3 1576Perl_refkids(pTHX_ OP *o, I32 type)
463ee0b2
LW		 1577{
1578 OP *kid;
11343788
MB		 1579 if (o && o->op_flags & OPf_KIDS) {
1580 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1581 ref(kid, type);
1582 }
11343788 1583 return o;
463ee0b2
LW		 1584}
1585
1586OP *
864dbfa3 1587Perl_ref(pTHX_ OP *o, I32 type)
463ee0b2
LW		 1588{
1589 OP *kid;
463ee0b2 1590
3280af22 1591 if (!o || PL_error_count)
11343788 1592 return o;
463ee0b2 1593
11343788 1594 switch (o->op_type) {
a0d0e21e 1595 case OP_ENTERSUB:
e55aaa0e 1596 if ((type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1597 !(o->op_flags & OPf_STACKED)) {
1598 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1599 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788
MB		 1600 assert(cUNOPo->op_first->op_type == OP_NULL);
1601 null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
1602 o->op_flags |= OPf_SPECIAL;
8990e307
LW		 1603 }
1604 break;
aeea060c 1605
463ee0b2 1606 case OP_COND_EXPR:
11343788 1607 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2
LW		 1608 ref(kid, type);
1609 break;
8990e307 1610 case OP_RV2SV:
35cd451c
GS		 1611 if (type == OP_DEFINED)
1612 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1613 ref(cUNOPo->op_first, o->op_type);
4633a7c4
LW		 1614 /* FALL THROUGH */
1615 case OP_PADSV:
5f05dabc 1616 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1617 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1618 : type == OP_RV2HV ? OPpDEREF_HV
1619 : OPpDEREF_SV);
11343788 1620 o->op_flags |= OPf_MOD;
a0d0e21e 1621 }
8990e307
LW		 1622 break;
1623
2faa37cc 1624 case OP_THREADSV:
a863c7d1
MB		 1625 o->op_flags |= OPf_MOD; /* XXX ??? */
1626 break;
1627
463ee0b2
LW		 1628 case OP_RV2AV:
1629 case OP_RV2HV:
aeea060c 1630 o->op_flags |= OPf_REF;
8990e307 1631 /* FALL THROUGH */
463ee0b2 1632 case OP_RV2GV:
35cd451c
GS		 1633 if (type == OP_DEFINED)
1634 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1635 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1636 break;
8990e307 1637
463ee0b2
LW		 1638 case OP_PADAV:
1639 case OP_PADHV:
aeea060c 1640 o->op_flags |= OPf_REF;
79072805 1641 break;
aeea060c 1642
8990e307 1643 case OP_SCALAR:
79072805 1644 case OP_NULL:
11343788 1645 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1646 break;
11343788 1647 ref(cBINOPo->op_first, type);
79072805
LW		 1648 break;
1649 case OP_AELEM:
1650 case OP_HELEM:
11343788 1651 ref(cBINOPo->op_first, o->op_type);
5f05dabc 1652 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1653 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1654 : type == OP_RV2HV ? OPpDEREF_HV
1655 : OPpDEREF_SV);
11343788 1656 o->op_flags |= OPf_MOD;
8990e307 1657 }
79072805
LW		 1658 break;
1659
463ee0b2 1660 case OP_SCOPE:
79072805
LW		 1661 case OP_LEAVE:
1662 case OP_ENTER:
8990e307 1663 case OP_LIST:
11343788 1664 if (!(o->op_flags & OPf_KIDS))
79072805 1665 break;
11343788 1666 ref(cLISTOPo->op_last, type);
79072805 1667 break;
a0d0e21e
LW		 1668 default:
1669 break;
79072805 1670 }
11343788 1671 return scalar(o);
8990e307 1672
79072805
LW		 1673}
1674
09bef843
SB		 1675STATIC OP *
1676S_dup_attrlist(pTHX_ OP *o)
1677{
1678 OP *rop = Nullop;
1679
1680 /* An attrlist is either a simple OP_CONST or an OP_LIST with kids,
1681 * where the first kid is OP_PUSHMARK and the remaining ones
1682 * are OP_CONST. We need to push the OP_CONST values.
1683 */
1684 if (o->op_type == OP_CONST)
1685 rop = newSVOP(OP_CONST, o->op_flags, SvREFCNT_inc(cSVOPo->op_sv));
1686 else {
1687 assert((o->op_type == OP_LIST) && (o->op_flags & OPf_KIDS));
1688 for (o = cLISTOPo->op_first; o; o=o->op_sibling) {
1689 if (o->op_type == OP_CONST)
1690 rop = append_elem(OP_LIST, rop,
1691 newSVOP(OP_CONST, o->op_flags,
1692 SvREFCNT_inc(cSVOPo->op_sv)));
1693 }
1694 }
1695 return rop;
1696}
1697
1698STATIC void
1699S_apply_attrs(pTHX_ HV *stash, SV *target, OP *attrs)
1700{
1701 OP *modname; /* for 'use' */
1702 SV *stashsv;
1703
1704 /* fake up C<use attributes $pkg,$rv,@attrs> */
1705 ENTER; /* need to protect against side-effects of 'use' */
1706 SAVEINT(PL_expect);
1707 if (stash && HvNAME(stash))
1708 stashsv = newSVpv(HvNAME(stash), 0);
1709 else
1710 stashsv = &PL_sv_no;
1711#define ATTRSMODULE "attributes"
1712 modname = newSVOP(OP_CONST, 0,
1713 newSVpvn(ATTRSMODULE, sizeof(ATTRSMODULE)-1));
1714 modname->op_private |= OPpCONST_BARE;
1715 /* that flag is required to make 'use' work right */
1716 utilize(1, start_subparse(FALSE, 0),
1717 Nullop, /* version */
1718 modname,
1719 prepend_elem(OP_LIST,
1720 newSVOP(OP_CONST, 0, stashsv),
1721 prepend_elem(OP_LIST,
1722 newSVOP(OP_CONST, 0, newRV(target)),
1723 dup_attrlist(attrs))));
1724 LEAVE;
1725}
1726
1727STATIC OP *
1728S_my_kid(pTHX_ OP *o, OP *attrs)
93a17b20
LW		 1729{
1730 OP *kid;
93a17b20
LW		 1731 I32 type;
1732
3280af22 1733 if (!o || PL_error_count)
11343788 1734 return o;
93a17b20 1735
11343788 1736 type = o->op_type;
93a17b20 1737 if (type == OP_LIST) {
11343788 1738 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
09bef843 1739 my_kid(kid, attrs);
dab48698 1740 } else if (type == OP_UNDEF) {
7766148a 1741 return o;
77ca0c92
LW		 1742 } else if (type == OP_RV2SV || /* "our" declaration */
1743 type == OP_RV2AV ||
1744 type == OP_RV2HV) { /* XXX does this let anything illegal in? */
1745 return o;
dab48698 1746 } else if (type != OP_PADSV &&
93a17b20
LW		 1747 type != OP_PADAV &&
1748 type != OP_PADHV &&
1749 type != OP_PUSHMARK)
1750 {
cea2e8a9 1751 yyerror(Perl_form(aTHX_ "Can't declare %s in my", PL_op_desc[o->op_type]));
11343788 1752 return o;
93a17b20 1753 }
09bef843
SB		 1754 else if (attrs && type != OP_PUSHMARK) {
1755 HV *stash;
1756 SV *padsv;
1757 SV **namesvp;
1758
1759 /* check for C<my Dog $spot> when deciding package */
1760 namesvp = av_fetch(PL_comppad_name, o->op_targ, FALSE);
1761 if (namesvp && *namesvp && SvOBJECT(*namesvp) && HvNAME(SvSTASH(*namesvp)))
1762 stash = SvSTASH(*namesvp);
1763 else
1764 stash = PL_curstash;
1765 padsv = PAD_SV(o->op_targ);
1766 apply_attrs(stash, padsv, attrs);
1767 }
11343788
MB		 1768 o->op_flags |= OPf_MOD;
1769 o->op_private |= OPpLVAL_INTRO;
1770 return o;
93a17b20
LW		 1771}
1772
1773OP *
09bef843
SB		 1774Perl_my_attrs(pTHX_ OP *o, OP *attrs)
1775{
1776 if (o->op_flags & OPf_PARENS)
1777 list(o);
1778 PL_in_my = FALSE;
1779 PL_in_my_stash = Nullhv;
1780 if (attrs)
1781 SAVEFREEOP(attrs);
1782 return my_kid(o, attrs);
1783}
1784
1785OP *
1786Perl_my(pTHX_ OP *o)
1787{
1788 return my_kid(o, Nullop);
1789}
1790
1791OP *
864dbfa3 1792Perl_sawparens(pTHX_ OP *o)
79072805
LW		 1793{
1794 if (o)
1795 o->op_flags |= OPf_PARENS;
1796 return o;
1797}
1798
1799OP *
864dbfa3 1800Perl_bind_match(pTHX_ I32 type, OP *left, OP *right)
79072805 1801{
d008e5eb 1802 dTHR;
11343788 1803 OP *o;
79072805 1804
599cee73
PM		 1805 if (ckWARN(WARN_UNSAFE) &&
1806 (left->op_type == OP_RV2AV ||
1807 left->op_type == OP_RV2HV ||
1808 left->op_type == OP_PADAV ||
1809 left->op_type == OP_PADHV)) {
22c35a8c 1810 char *desc = PL_op_desc[(right->op_type == OP_SUBST ||
599cee73
PM		 1811 right->op_type == OP_TRANS)
1812 ? right->op_type : OP_MATCH];
1813 char *sample = ((left->op_type == OP_RV2AV ||
1814 left->op_type == OP_PADAV)
1815 ? "@array" : "%hash");
cea2e8a9 1816 Perl_warner(aTHX_ WARN_UNSAFE,
599cee73
PM		 1817 "Applying %s to %s will act on scalar(%s)",
1818 desc, sample, sample);
2ae324a7 1819 }
1820
79072805
LW		 1821 if (right->op_type == OP_MATCH ||
1822 right->op_type == OP_SUBST ||
1823 right->op_type == OP_TRANS) {
1824 right->op_flags |= OPf_STACKED;
1825 if (right->op_type != OP_MATCH)
463ee0b2 1826 left = mod(left, right->op_type);
79072805 1827 if (right->op_type == OP_TRANS)
11343788 1828 o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805 1829 else
11343788 1830 o = prepend_elem(right->op_type, scalar(left), right);
79072805 1831 if (type == OP_NOT)
11343788
MB		 1832 return newUNOP(OP_NOT, 0, scalar(o));
1833 return o;
79072805
LW		 1834 }
1835 else
1836 return bind_match(type, left,
1837 pmruntime(newPMOP(OP_MATCH, 0), right, Nullop));
1838}
1839
1840OP *
864dbfa3 1841Perl_invert(pTHX_ OP *o)
79072805 1842{
11343788
MB		 1843 if (!o)
1844 return o;
79072805 1845 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
11343788 1846 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1847}
1848
1849OP *
864dbfa3 1850Perl_scope(pTHX_ OP *o)
79072805
LW		 1851{
1852 if (o) {
3280af22 1853 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || PL_tainting) {
463ee0b2
LW		 1854 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1855 o->op_type = OP_LEAVE;
22c35a8c 1856 o->op_ppaddr = PL_ppaddr[OP_LEAVE];
463ee0b2
LW		 1857 }
1858 else {
1859 if (o->op_type == OP_LINESEQ) {
1860 OP *kid;
1861 o->op_type = OP_SCOPE;
22c35a8c 1862 o->op_ppaddr = PL_ppaddr[OP_SCOPE];
c3ed7a6a
GS		 1863 kid = ((LISTOP*)o)->op_first;
1864 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE)
1865 null(kid);
463ee0b2
LW		 1866 }
1867 else
748a9306 1868 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
463ee0b2 1869 }
79072805
LW		 1870 }
1871 return o;
1872}
1873
b3ac6de7 1874void
864dbfa3 1875Perl_save_hints(pTHX)
b3ac6de7 1876{
3280af22
NIS		 1877 SAVEI32(PL_hints);
1878 SAVESPTR(GvHV(PL_hintgv));
1879 GvHV(PL_hintgv) = newHVhv(GvHV(PL_hintgv));
1880 SAVEFREESV(GvHV(PL_hintgv));
b3ac6de7
IZ		 1881}
1882
a0d0e21e 1883int
864dbfa3 1884Perl_block_start(pTHX_ int full)
79072805 1885{
11343788 1886 dTHR;
3280af22 1887 int retval = PL_savestack_ix;
b3ac6de7 1888
3280af22 1889 SAVEI32(PL_comppad_name_floor);
55497cff 1890 if (full) {
3280af22
NIS		 1891 if ((PL_comppad_name_fill = AvFILLp(PL_comppad_name)) > 0)
1892 PL_comppad_name_floor = PL_comppad_name_fill;
55497cff 1893 else
3280af22
NIS		 1894 PL_comppad_name_floor = 0;
1895 }
1896 SAVEI32(PL_min_intro_pending);
1897 SAVEI32(PL_max_intro_pending);
1898 PL_min_intro_pending = 0;
1899 SAVEI32(PL_comppad_name_fill);
1900 SAVEI32(PL_padix_floor);
1901 PL_padix_floor = PL_padix;
1902 PL_pad_reset_pending = FALSE;
b3ac6de7 1903 SAVEHINTS();
3280af22 1904 PL_hints &= ~HINT_BLOCK_SCOPE;
e24b16f9 1905 SAVEPPTR(PL_compiling.cop_warnings);
0453d815 1906 if (! specialWARN(PL_compiling.cop_warnings)) {
599cee73
PM		 1907 PL_compiling.cop_warnings = newSVsv(PL_compiling.cop_warnings) ;
1908 SAVEFREESV(PL_compiling.cop_warnings) ;
1909 }
1910
1911
a0d0e21e
LW		 1912 return retval;
1913}
1914
1915OP*
864dbfa3 1916Perl_block_end(pTHX_ I32 floor, OP *seq)
a0d0e21e 1917{
11343788 1918 dTHR;
3280af22 1919 int needblockscope = PL_hints & HINT_BLOCK_SCOPE;
a0d0e21e 1920 OP* retval = scalarseq(seq);
a0d0e21e 1921 LEAVE_SCOPE(floor);
3280af22 1922 PL_pad_reset_pending = FALSE;
e24b16f9 1923 PL_compiling.op_private = PL_hints;
a0d0e21e 1924 if (needblockscope)
3280af22
NIS		 1925 PL_hints |= HINT_BLOCK_SCOPE; /* propagate out */
1926 pad_leavemy(PL_comppad_name_fill);
1927 PL_cop_seqmax++;
a0d0e21e
LW		 1928 return retval;
1929}
1930
76e3520e 1931STATIC OP *
cea2e8a9 1932S_newDEFSVOP(pTHX)
54b9620d
MB		 1933{
1934#ifdef USE_THREADS
1935 OP *o = newOP(OP_THREADSV, 0);
1936 o->op_targ = find_threadsv("_");
1937 return o;
1938#else
3280af22 1939 return newSVREF(newGVOP(OP_GV, 0, PL_defgv));
54b9620d
MB		 1940#endif /* USE_THREADS */
1941}
1942
a0d0e21e 1943void
864dbfa3 1944Perl_newPROG(pTHX_ OP *o)
a0d0e21e 1945{
11343788 1946 dTHR;
3280af22 1947 if (PL_in_eval) {
b295d113
TH		 1948 if (PL_eval_root)
1949 return;
faef0170
HS		 1950 PL_eval_root = newUNOP(OP_LEAVEEVAL,
1951 ((PL_in_eval & EVAL_KEEPERR)
1952 ? OPf_SPECIAL : 0), o);
3280af22
NIS		 1953 PL_eval_start = linklist(PL_eval_root);
1954 PL_eval_root->op_next = 0;
1955 peep(PL_eval_start);
a0d0e21e
LW		 1956 }
1957 else {
5dc0d613 1958 if (!o)
a0d0e21e 1959 return;
3280af22
NIS		 1960 PL_main_root = scope(sawparens(scalarvoid(o)));
1961 PL_curcop = &PL_compiling;
1962 PL_main_start = LINKLIST(PL_main_root);
1963 PL_main_root->op_next = 0;
1964 peep(PL_main_start);
1965 PL_compcv = 0;
3841441e 1966
4fdae800 1967 /* Register with debugger */
84902520 1968 if (PERLDB_INTER) {
864dbfa3 1969 CV *cv = get_cv("DB::postponed", FALSE);
3841441e
CS		 1970 if (cv) {
1971 dSP;
924508f0 1972 PUSHMARK(SP);
3280af22 1973 XPUSHs((SV*)PL_compiling.cop_filegv);
3841441e 1974 PUTBACK;
864dbfa3 1975 call_sv((SV*)cv, G_DISCARD);
3841441e
CS		 1976 }
1977 }
79072805 1978 }
79072805
LW		 1979}
1980
1981OP *
864dbfa3 1982Perl_localize(pTHX_ OP *o, I32 lex)
79072805
LW		 1983{
1984 if (o->op_flags & OPf_PARENS)
1985 list(o);
8990e307 1986 else {
d008e5eb 1987 dTHR;
599cee73 1988 if (ckWARN(WARN_PARENTHESIS) && PL_bufptr > PL_oldbufptr && PL_bufptr[-1] == ',') {
8990e307 1989 char *s;
834a4ddd 1990 for (s = PL_bufptr; *s && (isALNUM(*s) || (*s & 0x80) || strchr("@$%, ",*s)); s++) ;
a0d0e21e 1991 if (*s == ';' || *s == '=')
cea2e8a9 1992 Perl_warner(aTHX_ WARN_PARENTHESIS, "Parentheses missing around \"%s\" list",
599cee73 1993 lex ? "my" : "local");
8990e307
LW		 1994 }
1995 }
3280af22
NIS		 1996 PL_in_my = FALSE;
1997 PL_in_my_stash = Nullhv;
93a17b20
LW		 1998 if (lex)
1999 return my(o);
2000 else
463ee0b2 2001 return mod(o, OP_NULL); /* a bit kludgey */
79072805
LW		 2002}
2003
2004OP *
864dbfa3 2005Perl_jmaybe(pTHX_ OP *o)
79072805
LW		 2006{
2007 if (o->op_type == OP_LIST) {
554b3eca
MB		 2008 OP *o2;
2009#ifdef USE_THREADS
2faa37cc 2010 o2 = newOP(OP_THREADSV, 0);
54b9620d 2011 o2->op_targ = find_threadsv(";");
554b3eca
MB		 2012#else
2013 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
2014#endif /* USE_THREADS */
2015 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 2016 }
2017 return o;
2018}
2019
2020OP *
864dbfa3 2021Perl_fold_constants(pTHX_ register OP *o)
79072805 2022{
11343788 2023 dTHR;
79072805
LW		 2024 register OP *curop;
2025 I32 type = o->op_type;
748a9306 2026 SV *sv;
79072805 2027
22c35a8c 2028 if (PL_opargs[type] & OA_RETSCALAR)
79072805 2029 scalar(o);
b162f9ea 2030 if (PL_opargs[type] & OA_TARGET && !o->op_targ)
ed6116ce 2031 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 2032
eac055e9
GS		 2033 /* integerize op, unless it happens to be C<-foo>.
2034 * XXX should pp_i_negate() do magic string negation instead? */
2035 if ((PL_opargs[type] & OA_OTHERINT) && (PL_hints & HINT_INTEGER)
2036 && !(type == OP_NEGATE && cUNOPo->op_first->op_type == OP_CONST
2037 && (cUNOPo->op_first->op_private & OPpCONST_BARE)))
2038 {
22c35a8c 2039 o->op_ppaddr = PL_ppaddr[type = ++(o->op_type)];
eac055e9 2040 }
85e6fe83 2041
22c35a8c 2042 if (!(PL_opargs[type] & OA_FOLDCONST))
79072805
LW		 2043 goto nope;
2044
de939608 2045 switch (type) {
7a52d87a
GS		 2046 case OP_NEGATE:
2047 /* XXX might want a ck_negate() for this */
2048 cUNOPo->op_first->op_private &= ~OPpCONST_STRICT;
2049 break;
de939608
CS		 2050 case OP_SPRINTF:
2051 case OP_UCFIRST:
2052 case OP_LCFIRST:
2053 case OP_UC:
2054 case OP_LC:
69dcf70c
MB		 2055 case OP_SLT:
2056 case OP_SGT:
2057 case OP_SLE:
2058 case OP_SGE:
2059 case OP_SCMP:
2060
de939608
CS		 2061 if (o->op_private & OPpLOCALE)
2062 goto nope;
2063 }
2064
3280af22 2065 if (PL_error_count)
a0d0e21e
LW		 2066 goto nope; /* Don't try to run w/ errors */
2067
79072805 2068 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
11fa937b
GS		 2069 if ((curop->op_type != OP_CONST ||
2070 (curop->op_private & OPpCONST_BARE)) &&
7a52d87a
GS		 2071 curop->op_type != OP_LIST &&
2072 curop->op_type != OP_SCALAR &&
2073 curop->op_type != OP_NULL &&
2074 curop->op_type != OP_PUSHMARK)
2075 {
79072805
LW		 2076 goto nope;
2077 }
2078 }
2079
2080 curop = LINKLIST(o);
2081 o->op_next = 0;
533c011a 2082 PL_op = curop;
cea2e8a9 2083 CALLRUNOPS(aTHX);
3280af22 2084 sv = *(PL_stack_sp--);
748a9306 2085 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
79072805 2086 pad_swipe(o->op_targ);
748a9306
LW		 2087 else if (SvTEMP(sv)) { /* grab mortal temp? */
2088 (void)SvREFCNT_inc(sv);
2089 SvTEMP_off(sv);
85e6fe83 2090 }
79072805
LW		 2091 op_free(o);
2092 if (type == OP_RV2GV)
b1cb66bf 2093 return newGVOP(OP_GV, 0, (GV*)sv);
748a9306 2094 else {
ee580363
GS		 2095 /* try to smush double to int, but don't smush -2.0 to -2 */
2096 if ((SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK)) == SVf_NOK &&
2097 type != OP_NEGATE)
2098 {
748a9306 2099 IV iv = SvIV(sv);
65202027 2100 if ((NV)iv == SvNV(sv)) {
748a9306
LW		 2101 SvREFCNT_dec(sv);
2102 sv = newSViv(iv);
2103 }
b1cb66bf 2104 else
2105 SvIOK_off(sv); /* undo SvIV() damage */
748a9306
LW		 2106 }
2107 return newSVOP(OP_CONST, 0, sv);
2108 }
aeea060c 2109
79072805 2110 nope:
22c35a8c 2111 if (!(PL_opargs[type] & OA_OTHERINT))
79072805 2112 return o;
79072805 2113
3280af22 2114 if (!(PL_hints & HINT_INTEGER)) {
a0d0e21e 2115 if (type == OP_DIVIDE || !(o->op_flags & OPf_KIDS))
85e6fe83
LW		 2116 return o;
2117
2118 for (curop = ((UNOP*)o)->op_first; curop; curop = curop->op_sibling) {
2119 if (curop->op_type == OP_CONST) {
b1cb66bf 2120 if (SvIOK(((SVOP*)curop)->op_sv))
85e6fe83
LW		 2121 continue;
2122 return o;
2123 }
22c35a8c 2124 if (PL_opargs[curop->op_type] & OA_RETINTEGER)
79072805
LW		 2125 continue;
2126 return o;
2127 }
22c35a8c 2128 o->op_ppaddr = PL_ppaddr[++(o->op_type)];
79072805
LW		 2129 }
2130
79072805
LW		 2131 return o;
2132}
2133
2134OP *
864dbfa3 2135Perl_gen_constant_list(pTHX_ register OP *o)
79072805 2136{
11343788 2137 dTHR;
79072805 2138 register OP *curop;
3280af22 2139 I32 oldtmps_floor = PL_tmps_floor;
79072805 2140
a0d0e21e 2141 list(o);
3280af22 2142 if (PL_error_count)
a0d0e21e
LW		 2143 return o; /* Don't attempt to run with errors */
2144
533c011a 2145 PL_op = curop = LINKLIST(o);
a0d0e21e 2146 o->op_next = 0;
cea2e8a9
GS		 2147 pp_pushmark();
2148 CALLRUNOPS(aTHX);
533c011a 2149 PL_op = curop;
cea2e8a9 2150 pp_anonlist();
3280af22 2151 PL_tmps_floor = oldtmps_floor;
79072805
LW		 2152
2153 o->op_type = OP_RV2AV;
22c35a8c 2154 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
79072805 2155 curop = ((UNOP*)o)->op_first;
3280af22 2156 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*PL_stack_sp--));
79072805 2157 op_free(curop);
79072805
LW		 2158 linklist(o);
2159 return list(o);
2160}
2161
2162OP *
864dbfa3 2163Perl_convert(pTHX_ I32 type, I32 flags, OP *o)
79072805
LW		 2164{
2165 OP *kid;
a0d0e21e 2166 OP *last = 0;
79072805 2167
11343788
MB		 2168 if (!o || o->op_type != OP_LIST)
2169 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 2170 else
5dc0d613 2171 o->op_flags &= ~OPf_WANT;
79072805 2172
22c35a8c 2173 if (!(PL_opargs[type] & OA_MARK))
11343788 2174 null(cLISTOPo->op_first);
8990e307 2175
11343788 2176 o->op_type = type;
22c35a8c 2177 o->op_ppaddr = PL_ppaddr[type];
11343788 2178 o->op_flags |= flags;
79072805 2179
11343788
MB		 2180 o = CHECKOP(type, o);
2181 if (o->op_type != type)
2182 return o;
79072805 2183
11343788 2184 if (cLISTOPo->op_children < 7) {
79072805 2185 /* XXX do we really need to do this if we're done appending?? */
11343788 2186 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805 2187 last = kid;
11343788 2188 cLISTOPo->op_last = last; /* in case check substituted last arg */
79072805
LW		 2189 }
2190
11343788 2191 return fold_constants(o);
79072805
LW		 2192}
2193
2194/* List constructors */
2195
2196OP *
864dbfa3 2197Perl_append_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2198{
2199 if (!first)
2200 return last;
8990e307
LW		 2201
2202 if (!last)
79072805 2203 return first;
8990e307 2204
a0d0e21e
LW		 2205 if (first->op_type != type || type==OP_LIST && first->op_flags & OPf_PARENS)
2206 return newLISTOP(type, 0, first, last);
79072805 2207
a0d0e21e
LW		 2208 if (first->op_flags & OPf_KIDS)
2209 ((LISTOP*)first)->op_last->op_sibling = last;
2210 else {
2211 first->op_flags |= OPf_KIDS;
2212 ((LISTOP*)first)->op_first = last;
2213 }
2214 ((LISTOP*)first)->op_last = last;
2215 ((LISTOP*)first)->op_children++;
2216 return first;
79072805
LW		 2217}
2218
2219OP *
864dbfa3 2220Perl_append_list(pTHX_ I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 2221{
2222 if (!first)
2223 return (OP*)last;
8990e307
LW		 2224
2225 if (!last)
79072805 2226 return (OP*)first;
8990e307
LW		 2227
2228 if (first->op_type != type)
79072805 2229 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307
LW		 2230
2231 if (last->op_type != type)
79072805
LW		 2232 return append_elem(type, (OP*)first, (OP*)last);
2233
2234 first->op_last->op_sibling = last->op_first;
2235 first->op_last = last->op_last;
2236 first->op_children += last->op_children;
2237 if (first->op_children)
acb74605 2238 first->op_flags |= OPf_KIDS;
b7dc083c
NIS		 2239
2240#ifdef PL_OP_SLAB_ALLOC
2241#else
2242 Safefree(last);
2243#endif
79072805
LW		 2244 return (OP*)first;
2245}
2246
2247OP *
864dbfa3 2248Perl_prepend_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2249{
2250 if (!first)
2251 return last;
8990e307
LW		 2252
2253 if (!last)
79072805 2254 return first;
8990e307
LW		 2255
2256 if (last->op_type == type) {
2257 if (type == OP_LIST) { /* already a PUSHMARK there */
2258 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
2259 ((LISTOP*)last)->op_first->op_sibling = first;
2260 }
2261 else {
2262 if (!(last->op_flags & OPf_KIDS)) {
2263 ((LISTOP*)last)->op_last = first;
2264 last->op_flags |= OPf_KIDS;
2265 }
2266 first->op_sibling = ((LISTOP*)last)->op_first;
2267 ((LISTOP*)last)->op_first = first;
79072805 2268 }
79072805
LW		 2269 ((LISTOP*)last)->op_children++;
2270 return last;
2271 }
2272
2273 return newLISTOP(type, 0, first, last);
2274}
2275
2276/* Constructors */
2277
2278OP *
864dbfa3 2279Perl_newNULLLIST(pTHX)
79072805 2280{
8990e307
LW		 2281 return newOP(OP_STUB, 0);
2282}
2283
2284OP *
864dbfa3 2285Perl_force_list(pTHX_ OP *o)
8990e307 2286{
11343788
MB		 2287 if (!o || o->op_type != OP_LIST)
2288 o = newLISTOP(OP_LIST, 0, o, Nullop);
2289 null(o);
2290 return o;
79072805
LW		 2291}
2292
2293OP *
864dbfa3 2294Perl_newLISTOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2295{
2296 LISTOP *listop;
2297
b7dc083c 2298 NewOp(1101, listop, 1, LISTOP);
79072805
LW		 2299
2300 listop->op_type = type;
22c35a8c 2301 listop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2302 listop->op_children = (first != 0) + (last != 0);
2303 listop->op_flags = flags;
79072805
LW		 2304
2305 if (!last && first)
2306 last = first;
2307 else if (!first && last)
2308 first = last;
8990e307
LW		 2309 else if (first)
2310 first->op_sibling = last;
79072805
LW		 2311 listop->op_first = first;
2312 listop->op_last = last;
8990e307
LW		 2313 if (type == OP_LIST) {
2314 OP* pushop;
2315 pushop = newOP(OP_PUSHMARK, 0);
2316 pushop->op_sibling = first;
2317 listop->op_first = pushop;
2318 listop->op_flags |= OPf_KIDS;
2319 if (!last)
2320 listop->op_last = pushop;
2321 }
2322 else if (listop->op_children)
2323 listop->op_flags |= OPf_KIDS;
79072805
LW		 2324
2325 return (OP*)listop;
2326}
2327
2328OP *
864dbfa3 2329Perl_newOP(pTHX_ I32 type, I32 flags)
79072805 2330{
11343788 2331 OP *o;
b7dc083c 2332 NewOp(1101, o, 1, OP);
11343788 2333 o->op_type = type;
22c35a8c 2334 o->op_ppaddr = PL_ppaddr[type];
11343788 2335 o->op_flags = flags;
79072805 2336
11343788
MB		 2337 o->op_next = o;
2338 o->op_private = 0 + (flags >> 8);
22c35a8c 2339 if (PL_opargs[type] & OA_RETSCALAR)
11343788 2340 scalar(o);
22c35a8c 2341 if (PL_opargs[type] & OA_TARGET)
11343788
MB		 2342 o->op_targ = pad_alloc(type, SVs_PADTMP);
2343 return CHECKOP(type, o);
79072805
LW		 2344}
2345
2346OP *
864dbfa3 2347Perl_newUNOP(pTHX_ I32 type, I32 flags, OP *first)
79072805
LW		 2348{
2349 UNOP *unop;
2350
93a17b20 2351 if (!first)
aeea060c 2352 first = newOP(OP_STUB, 0);
22c35a8c 2353 if (PL_opargs[type] & OA_MARK)
8990e307 2354 first = force_list(first);
93a17b20 2355
b7dc083c 2356 NewOp(1101, unop, 1, UNOP);
79072805 2357 unop->op_type = type;
22c35a8c 2358 unop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2359 unop->op_first = first;
2360 unop->op_flags = flags | OPf_KIDS;
c07a80fd 2361 unop->op_private = 1 | (flags >> 8);
e50aee73 2362 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 2363 if (unop->op_next)
2364 return (OP*)unop;
2365
a0d0e21e 2366 return fold_constants((OP *) unop);
79072805
LW		 2367}
2368
2369OP *
864dbfa3 2370Perl_newBINOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2371{
2372 BINOP *binop;
b7dc083c 2373 NewOp(1101, binop, 1, BINOP);
79072805
LW		 2374
2375 if (!first)
2376 first = newOP(OP_NULL, 0);
2377
2378 binop->op_type = type;
22c35a8c 2379 binop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2380 binop->op_first = first;
2381 binop->op_flags = flags | OPf_KIDS;
2382 if (!last) {
2383 last = first;
c07a80fd 2384 binop->op_private = 1 | (flags >> 8);
79072805
LW		 2385 }
2386 else {
c07a80fd 2387 binop->op_private = 2 | (flags >> 8);
79072805
LW		 2388 first->op_sibling = last;
2389 }
2390
e50aee73 2391 binop = (BINOP*)CHECKOP(type, binop);
b162f9ea 2392 if (binop->op_next || binop->op_type != type)
79072805
LW		 2393 return (OP*)binop;
2394
7284ab6f 2395 binop->op_last = binop->op_first->op_sibling;
79072805 2396
a0d0e21e 2397 return fold_constants((OP *)binop);
79072805
LW		 2398}
2399
a0ed51b3
LW		 2400static int
2401utf8compare(const void *a, const void *b)
2402{
2403 int i;
2404 for (i = 0; i < 10; i++) {
2405 if ((*(U8**)a)[i] < (*(U8**)b)[i])
2406 return -1;
2407 if ((*(U8**)a)[i] > (*(U8**)b)[i])
2408 return 1;
2409 }
2410 return 0;
2411}
2412
79072805 2413OP *
864dbfa3 2414Perl_pmtrans(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2415{
79072805
LW		 2416 SV *tstr = ((SVOP*)expr)->op_sv;
2417 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 2418 STRLEN tlen;
2419 STRLEN rlen;
ec49126f 2420 register U8 *t = (U8*)SvPV(tstr, tlen);
2421 register U8 *r = (U8*)SvPV(rstr, rlen);
79072805
LW		 2422 register I32 i;
2423 register I32 j;
a0ed51b3 2424 I32 del;
79072805 2425 I32 complement;
5d06d08e 2426 I32 squash;
79072805
LW		 2427 register short *tbl;
2428
11343788 2429 complement = o->op_private & OPpTRANS_COMPLEMENT;
a0ed51b3 2430 del = o->op_private & OPpTRANS_DELETE;
5d06d08e 2431 squash = o->op_private & OPpTRANS_SQUASH;
79072805 2432
a0ed51b3 2433 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
79cb57f6 2434 SV* listsv = newSVpvn("# comment\n",10);
a0ed51b3
LW		 2435 SV* transv = 0;
2436 U8* tend = t + tlen;
2437 U8* rend = r + rlen;
2438 I32 ulen;
2439 U32 tfirst = 1;
2440 U32 tlast = 0;
2441 I32 tdiff;
2442 U32 rfirst = 1;
2443 U32 rlast = 0;
2444 I32 rdiff;
2445 I32 diff;
2446 I32 none = 0;
2447 U32 max = 0;
2448 I32 bits;
2449 I32 grows = 0;
2450 I32 havefinal = 0;
2451 U32 final;
2452 HV *hv;
2453 I32 from_utf = o->op_private & OPpTRANS_FROM_UTF;
2454 I32 to_utf = o->op_private & OPpTRANS_TO_UTF;
2455
2456 if (complement) {
2457 U8 tmpbuf[10];
2458 U8** cp;
2459 UV nextmin = 0;
2460 New(1109, cp, tlen, U8*);
2461 i = 0;
79cb57f6 2462 transv = newSVpvn("",0);
a0ed51b3
LW		 2463 while (t < tend) {
2464 cp[i++] = t;
2465 t += UTF8SKIP(t);
2466 if (*t == 0xff) {
2467 t++;
2468 t += UTF8SKIP(t);
2469 }
2470 }
2471 qsort(cp, i, sizeof(U8*), utf8compare);
2472 for (j = 0; j < i; j++) {
2473 U8 *s = cp[j];
2474 UV val = utf8_to_uv(s, &ulen);
2475 s += ulen;
2476 diff = val - nextmin;
2477 if (diff > 0) {
2478 t = uv_to_utf8(tmpbuf,nextmin);
dfe13c55 2479 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2480 if (diff > 1) {
2481 t = uv_to_utf8(tmpbuf, val - 1);
2482 sv_catpvn(transv, "\377", 1);
dfe13c55 2483 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2484 }
2485 }
2486 if (*s == 0xff)
2487 val = utf8_to_uv(s+1, &ulen);
2488 if (val >= nextmin)
2489 nextmin = val + 1;
2490 }
2491 t = uv_to_utf8(tmpbuf,nextmin);
dfe13c55 2492 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2493 t = uv_to_utf8(tmpbuf, 0x7fffffff);
2494 sv_catpvn(transv, "\377", 1);
dfe13c55
GS		 2495 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
2496 t = (U8*)SvPVX(transv);
a0ed51b3
LW		 2497 tlen = SvCUR(transv);
2498 tend = t + tlen;
2499 }
2500 else if (!rlen && !del) {
2501 r = t; rlen = tlen; rend = tend;
4757a243
LW		 2502 }
2503 if (!squash) {
2504 if (to_utf && from_utf) { /* only counting characters */
2505 if (t == r || (tlen == rlen && memEQ(t, r, tlen)))
2506 o->op_private |= OPpTRANS_IDENTICAL;
2507 }
2508 else { /* straight latin-1 translation */
2509 if (tlen == 4 && memEQ(t, "\0\377\303\277", 4) &&
2510 rlen == 4 && memEQ(r, "\0\377\303\277", 4))
2511 o->op_private |= OPpTRANS_IDENTICAL;
2512 }
a0ed51b3
LW		 2513 }
2514
2515 while (t < tend || tfirst <= tlast) {
2516 /* see if we need more "t" chars */
2517 if (tfirst > tlast) {
2518 tfirst = (I32)utf8_to_uv(t, &ulen);
2519 t += ulen;
2520 if (t < tend && *t == 0xff) { /* illegal utf8 val indicates range */
2521 tlast = (I32)utf8_to_uv(++t, &ulen);
2522 t += ulen;
2523 }
2524 else
2525 tlast = tfirst;
2526 }
2527
2528 /* now see if we need more "r" chars */
2529 if (rfirst > rlast) {
2530 if (r < rend) {
2531 rfirst = (I32)utf8_to_uv(r, &ulen);
2532 r += ulen;
2533 if (r < rend && *r == 0xff) { /* illegal utf8 val indicates range */
2534 rlast = (I32)utf8_to_uv(++r, &ulen);
2535 r += ulen;
2536 }
2537 else
2538 rlast = rfirst;
2539 }
2540 else {
2541 if (!havefinal++)
2542 final = rlast;
2543 rfirst = rlast = 0xffffffff;
2544 }
2545 }
2546
2547 /* now see which range will peter our first, if either. */
2548 tdiff = tlast - tfirst;
2549 rdiff = rlast - rfirst;
2550
2551 if (tdiff <= rdiff)
2552 diff = tdiff;
2553 else
2554 diff = rdiff;
2555
2556 if (rfirst == 0xffffffff) {
2557 diff = tdiff; /* oops, pretend rdiff is infinite */
2558 if (diff > 0)
cea2e8a9 2559 Perl_sv_catpvf(aTHX_ listsv, "%04x\t%04x\tXXXX\n", tfirst, tlast);
a0ed51b3 2560 else
cea2e8a9 2561 Perl_sv_catpvf(aTHX_ listsv, "%04x\t\tXXXX\n", tfirst);
a0ed51b3
LW		 2562 }
2563 else {
2564 if (diff > 0)
cea2e8a9 2565 Perl_sv_catpvf(aTHX_ listsv, "%04x\t%04x\t%04x\n", tfirst, tfirst + diff, rfirst);
a0ed51b3 2566 else
cea2e8a9 2567 Perl_sv_catpvf(aTHX_ listsv, "%04x\t\t%04x\n", tfirst, rfirst);
a0ed51b3
LW		 2568
2569 if (rfirst + diff > max)
2570 max = rfirst + diff;
2571 rfirst += diff + 1;
2572 if (!grows) {
2573 if (rfirst <= 0x80)
2574 ;
2575 else if (rfirst <= 0x800)
2576 grows |= (tfirst < 0x80);
2577 else if (rfirst <= 0x10000)
2578 grows |= (tfirst < 0x800);
2579 else if (rfirst <= 0x200000)
2580 grows |= (tfirst < 0x10000);
2581 else if (rfirst <= 0x4000000)
2582 grows |= (tfirst < 0x200000);
2583 else if (rfirst <= 0x80000000)
2584 grows |= (tfirst < 0x4000000);
2585 }
2586 }
2587 tfirst += diff + 1;
2588 }
2589
2590 none = ++max;
2591 if (del)
2592 del = ++max;
2593
2594 if (max > 0xffff)
2595 bits = 32;
2596 else if (max > 0xff)
2597 bits = 16;
2598 else
2599 bits = 8;
2600
2601 cSVOPo->op_sv = (SV*)swash_init("utf8", "", listsv, bits, none);
2602 SvREFCNT_dec(listsv);
2603 if (transv)
2604 SvREFCNT_dec(transv);
2605
2606 if (!del && havefinal)
2607 (void)hv_store((HV*)SvRV((cSVOPo->op_sv)), "FINAL", 5, newSViv((IV)final), 0);
2608
2609 if (grows && to_utf)
2610 o->op_private |= OPpTRANS_GROWS;
2611
2612 op_free(expr);
2613 op_free(repl);
2614 return o;
2615 }
2616
2617 tbl = (short*)cPVOPo->op_pv;
79072805
LW		 2618 if (complement) {
2619 Zero(tbl, 256, short);
2620 for (i = 0; i < tlen; i++)
ec49126f 2621 tbl[t[i]] = -1;
79072805
LW		 2622 for (i = 0, j = 0; i < 256; i++) {
2623 if (!tbl[i]) {
2624 if (j >= rlen) {
a0ed51b3 2625 if (del)
79072805
LW		 2626 tbl[i] = -2;
2627 else if (rlen)
ec49126f 2628 tbl[i] = r[j-1];
79072805
LW		 2629 else
2630 tbl[i] = i;
2631 }
2632 else
ec49126f 2633 tbl[i] = r[j++];
79072805
LW		 2634 }
2635 }
2636 }
2637 else {
a0ed51b3 2638 if (!rlen && !del) {
79072805 2639 r = t; rlen = tlen;
5d06d08e 2640 if (!squash)
4757a243 2641 o->op_private |= OPpTRANS_IDENTICAL;
79072805
LW		 2642 }
2643 for (i = 0; i < 256; i++)
2644 tbl[i] = -1;
2645 for (i = 0, j = 0; i < tlen; i++,j++) {
2646 if (j >= rlen) {
a0ed51b3 2647 if (del) {
ec49126f 2648 if (tbl[t[i]] == -1)
2649 tbl[t[i]] = -2;
79072805
LW		 2650 continue;
2651 }
2652 --j;
2653 }
ec49126f 2654 if (tbl[t[i]] == -1)
2655 tbl[t[i]] = r[j];
79072805
LW		 2656 }
2657 }
2658 op_free(expr);
2659 op_free(repl);
2660
11343788 2661 return o;
79072805
LW		 2662}
2663
2664OP *
864dbfa3 2665Perl_newPMOP(pTHX_ I32 type, I32 flags)
79072805 2666{
11343788 2667 dTHR;
79072805
LW		 2668 PMOP *pmop;
2669
b7dc083c 2670 NewOp(1101, pmop, 1, PMOP);
79072805 2671 pmop->op_type = type;
22c35a8c 2672 pmop->op_ppaddr = PL_ppaddr[type];
79072805 2673 pmop->op_flags = flags;
c07a80fd 2674 pmop->op_private = 0 | (flags >> 8);
79072805 2675
3280af22 2676 if (PL_hints & HINT_RE_TAINT)
b3eb6a9b 2677 pmop->op_pmpermflags |= PMf_RETAINT;
3280af22 2678 if (PL_hints & HINT_LOCALE)
b3eb6a9b
GS		 2679 pmop->op_pmpermflags |= PMf_LOCALE;
2680 pmop->op_pmflags = pmop->op_pmpermflags;
36477c24 2681
79072805 2682 /* link into pm list */
3280af22
NIS		 2683 if (type != OP_TRANS && PL_curstash) {
2684 pmop->op_pmnext = HvPMROOT(PL_curstash);
2685 HvPMROOT(PL_curstash) = pmop;
79072805
LW		 2686 }
2687
2688 return (OP*)pmop;
2689}
2690
2691OP *
864dbfa3 2692Perl_pmruntime(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2693{
5c0ca799 2694 dTHR;
79072805
LW		 2695 PMOP *pm;
2696 LOGOP *rcop;
ce862d02 2697 I32 repl_has_vars = 0;
79072805 2698
11343788
MB		 2699 if (o->op_type == OP_TRANS)
2700 return pmtrans(o, expr, repl);
79072805 2701
3280af22 2702 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2703 pm = (PMOP*)o;
79072805
LW		 2704
2705 if (expr->op_type == OP_CONST) {
463ee0b2 2706 STRLEN plen;
79072805 2707 SV *pat = ((SVOP*)expr)->op_sv;
463ee0b2 2708 char *p = SvPV(pat, plen);
11343788 2709 if ((o->op_flags & OPf_SPECIAL) && strEQ(p, " ")) {
93a17b20 2710 sv_setpvn(pat, "\\s+", 3);
463ee0b2 2711 p = SvPV(pat, plen);
79072805
LW		 2712 pm->op_pmflags |= PMf_SKIPWHITE;
2713 }
cea2e8a9 2714 pm->op_pmregexp = CALLREGCOMP(aTHX_ p, p + plen, pm);
aeea060c 2715 if (strEQ("\\s+", pm->op_pmregexp->precomp))
85e6fe83 2716 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2717 op_free(expr);
2718 }
2719 else {
3280af22
NIS		 2720 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL))
2721 expr = newUNOP((!(PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2722 ? OP_REGCRESET
2723 : OP_REGCMAYBE),0,expr);
463ee0b2 2724
b7dc083c 2725 NewOp(1101, rcop, 1, LOGOP);
79072805 2726 rcop->op_type = OP_REGCOMP;
22c35a8c 2727 rcop->op_ppaddr = PL_ppaddr[OP_REGCOMP];
79072805 2728 rcop->op_first = scalar(expr);
3280af22 2729 rcop->op_flags |= ((PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2730 ? (OPf_SPECIAL | OPf_KIDS)
2731 : OPf_KIDS);
79072805 2732 rcop->op_private = 1;
11343788 2733 rcop->op_other = o;
79072805
LW		 2734
2735 /* establish postfix order */
3280af22 2736 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL)) {
463ee0b2
LW		 2737 LINKLIST(expr);
2738 rcop->op_next = expr;
2739 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2740 }
2741 else {
2742 rcop->op_next = LINKLIST(expr);
2743 expr->op_next = (OP*)rcop;
2744 }
79072805 2745
11343788 2746 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2747 }
2748
2749 if (repl) {
748a9306 2750 OP *curop;
0244c3a4 2751 if (pm->op_pmflags & PMf_EVAL) {
748a9306 2752 curop = 0;
0244c3a4
GS		 2753 if (PL_curcop->cop_line < PL_multi_end)
2754 PL_curcop->cop_line = PL_multi_end;
2755 }
554b3eca 2756#ifdef USE_THREADS
2faa37cc 2757 else if (repl->op_type == OP_THREADSV
554b3eca 2758 && strchr("&`'123456789+",
533c011a 2759 PL_threadsv_names[repl->op_targ]))
554b3eca
MB		 2760 {
2761 curop = 0;
2762 }
2763#endif /* USE_THREADS */
748a9306
LW		 2764 else if (repl->op_type == OP_CONST)
2765 curop = repl;
79072805 2766 else {
79072805
LW		 2767 OP *lastop = 0;
2768 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
22c35a8c 2769 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
554b3eca 2770#ifdef USE_THREADS
ce862d02
IZ		 2771 if (curop->op_type == OP_THREADSV) {
2772 repl_has_vars = 1;
be949f6f 2773 if (strchr("&`'123456789+", curop->op_private))
ce862d02 2774 break;
554b3eca
MB		 2775 }
2776#else
79072805
LW		 2777 if (curop->op_type == OP_GV) {
2778 GV *gv = ((GVOP*)curop)->op_gv;
ce862d02 2779 repl_has_vars = 1;
93a17b20 2780 if (strchr("&`'123456789+", *GvENAME(gv)))
79072805
LW		 2781 break;
2782 }
554b3eca 2783#endif /* USE_THREADS */
79072805
LW		 2784 else if (curop->op_type == OP_RV2CV)
2785 break;
2786 else if (curop->op_type == OP_RV2SV ||
2787 curop->op_type == OP_RV2AV ||
2788 curop->op_type == OP_RV2HV ||
2789 curop->op_type == OP_RV2GV) {
2790 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2791 break;
2792 }
748a9306
LW		 2793 else if (curop->op_type == OP_PADSV ||
2794 curop->op_type == OP_PADAV ||
2795 curop->op_type == OP_PADHV ||
554b3eca 2796 curop->op_type == OP_PADANY) {
ce862d02 2797 repl_has_vars = 1;
748a9306 2798 }
1167e5da
SM		 2799 else if (curop->op_type == OP_PUSHRE)
2800 ; /* Okay here, dangerous in newASSIGNOP */
79072805
LW		 2801 else
2802 break;
2803 }
2804 lastop = curop;
2805 }
748a9306 2806 }
ce862d02
IZ		 2807 if (curop == repl
2808 && !(repl_has_vars
2809 && (!pm->op_pmregexp
2810 || pm->op_pmregexp->reganch & ROPT_EVAL_SEEN))) {
748a9306 2811 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2812 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2813 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2814 }
2815 else {
ce862d02
IZ		 2816 if (curop == repl && !pm->op_pmregexp) { /* Has variables. */
2817 pm->op_pmflags |= PMf_MAYBE_CONST;
2818 pm->op_pmpermflags |= PMf_MAYBE_CONST;
2819 }
b7dc083c 2820 NewOp(1101, rcop, 1, LOGOP);
748a9306 2821 rcop->op_type = OP_SUBSTCONT;
22c35a8c 2822 rcop->op_ppaddr = PL_ppaddr[OP_SUBSTCONT];
748a9306
LW		 2823 rcop->op_first = scalar(repl);
2824 rcop->op_flags |= OPf_KIDS;
2825 rcop->op_private = 1;
11343788 2826 rcop->op_other = o;
748a9306
LW		 2827
2828 /* establish postfix order */
2829 rcop->op_next = LINKLIST(repl);
2830 repl->op_next = (OP*)rcop;
2831
2832 pm->op_pmreplroot = scalar((OP*)rcop);
2833 pm->op_pmreplstart = LINKLIST(rcop);
2834 rcop->op_next = 0;
79072805
LW		 2835 }
2836 }
2837
2838 return (OP*)pm;
2839}
2840
2841OP *
864dbfa3 2842Perl_newSVOP(pTHX_ I32 type, I32 flags, SV *sv)
79072805
LW		 2843{
2844 SVOP *svop;
b7dc083c 2845 NewOp(1101, svop, 1, SVOP);
79072805 2846 svop->op_type = type;
22c35a8c 2847 svop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2848 svop->op_sv = sv;
2849 svop->op_next = (OP*)svop;
2850 svop->op_flags = flags;
22c35a8c 2851 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2852 scalar((OP*)svop);
22c35a8c 2853 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2854 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2855 return CHECKOP(type, svop);
79072805
LW		 2856}
2857
2858OP *
864dbfa3 2859Perl_newGVOP(pTHX_ I32 type, I32 flags, GV *gv)
79072805 2860{
11343788 2861 dTHR;
79072805 2862 GVOP *gvop;
b7dc083c 2863 NewOp(1101, gvop, 1, GVOP);
79072805 2864 gvop->op_type = type;
22c35a8c 2865 gvop->op_ppaddr = PL_ppaddr[type];
8990e307 2866 gvop->op_gv = (GV*)SvREFCNT_inc(gv);
79072805
LW		 2867 gvop->op_next = (OP*)gvop;
2868 gvop->op_flags = flags;
22c35a8c 2869 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2870 scalar((OP*)gvop);
22c35a8c 2871 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2872 gvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2873 return CHECKOP(type, gvop);
79072805
LW		 2874}
2875
2876OP *
864dbfa3 2877Perl_newPVOP(pTHX_ I32 type, I32 flags, char *pv)
79072805
LW		 2878{
2879 PVOP *pvop;
b7dc083c 2880 NewOp(1101, pvop, 1, PVOP);
79072805 2881 pvop->op_type = type;
22c35a8c 2882 pvop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2883 pvop->op_pv = pv;
2884 pvop->op_next = (OP*)pvop;
2885 pvop->op_flags = flags;
22c35a8c 2886 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2887 scalar((OP*)pvop);
22c35a8c 2888 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2889 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2890 return CHECKOP(type, pvop);
79072805
LW		 2891}
2892
79072805 2893void
864dbfa3 2894Perl_package(pTHX_ OP *o)
79072805 2895{
11343788 2896 dTHR;
93a17b20 2897 SV *sv;
79072805 2898
3280af22
NIS		 2899 save_hptr(&PL_curstash);
2900 save_item(PL_curstname);
11343788 2901 if (o) {
463ee0b2
LW		 2902 STRLEN len;
2903 char *name;
11343788 2904 sv = cSVOPo->op_sv;
463ee0b2 2905 name = SvPV(sv, len);
3280af22
NIS		 2906 PL_curstash = gv_stashpvn(name,len,TRUE);
2907 sv_setpvn(PL_curstname, name, len);
11343788 2908 op_free(o);
93a17b20
LW		 2909 }
2910 else {
3280af22
NIS		 2911 sv_setpv(PL_curstname,"<none>");
2912 PL_curstash = Nullhv;
93a17b20 2913 }
7ad382f4 2914 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 2915 PL_copline = NOLINE;
2916 PL_expect = XSTATE;
79072805
LW		 2917}
2918
85e6fe83 2919void
864dbfa3 2920Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *id, OP *arg)
85e6fe83 2921{
a0d0e21e
LW		 2922 OP *pack;
2923 OP *meth;
2924 OP *rqop;
2925 OP *imop;
b1cb66bf 2926 OP *veop;
78ca652e 2927 GV *gv;
85e6fe83 2928
a0d0e21e 2929 if (id->op_type != OP_CONST)
cea2e8a9 2930 Perl_croak(aTHX_ "Module name must be constant");
85e6fe83 2931
b1cb66bf 2932 veop = Nullop;
2933
2934 if(version != Nullop) {
2935 SV *vesv = ((SVOP*)version)->op_sv;
2936
2937 if (arg == Nullop && !SvNIOK(vesv)) {
2938 arg = version;
2939 }
2940 else {
2941 OP *pack;
b1cb66bf 2942
2943 if (version->op_type != OP_CONST || !SvNIOK(vesv))
cea2e8a9 2944 Perl_croak(aTHX_ "Version number must be constant number");
b1cb66bf 2945
2946 /* Make copy of id so we don't free it twice */
2947 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
2948
2949 /* Fake up a method call to VERSION */
b1cb66bf 2950 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
2951 append_elem(OP_LIST,
2952 prepend_elem(OP_LIST, pack, list(version)),
f5d5a27c
CS		 2953 newSVOP(OP_METHOD_NAMED, 0,
2954 newSVpvn("VERSION", 7))));
b1cb66bf 2955 }
2956 }
aeea060c 2957
a0d0e21e 2958 /* Fake up an import/unimport */
4633a7c4
LW		 2959 if (arg && arg->op_type == OP_STUB)
2960 imop = arg; /* no import on explicit () */
b1cb66bf 2961 else if(SvNIOK(((SVOP*)id)->op_sv)) {
2962 imop = Nullop; /* use 5.0; */
2963 }
4633a7c4
LW		 2964 else {
2965 /* Make copy of id so we don't free it twice */
2966 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
4633a7c4 2967 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
a0d0e21e
LW		 2968 append_elem(OP_LIST,
2969 prepend_elem(OP_LIST, pack, list(arg)),
f5d5a27c
CS		 2970 newSVOP(OP_METHOD_NAMED, 0,
2971 aver ? newSVpvn("import", 6)
2972 : newSVpvn("unimport", 8))));
4633a7c4
LW		 2973 }
2974
78ca652e
GS		 2975 /* Fake up a require, handle override, if any */
2976 gv = gv_fetchpv("require", FALSE, SVt_PVCV);
2977 if (!(gv && GvIMPORTED_CV(gv)))
2978 gv = gv_fetchpv("CORE::GLOBAL::require", FALSE, SVt_PVCV);
2979
2980 if (gv && GvIMPORTED_CV(gv)) {
2981 rqop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
2982 append_elem(OP_LIST, id,
2983 scalar(newUNOP(OP_RV2CV, 0,
2984 newGVOP(OP_GV, 0,
2985 gv))))));
2986 }
2987 else {
2988 rqop = newUNOP(OP_REQUIRE, 0, id);
2989 }
a0d0e21e
LW		 2990
2991 /* Fake up the BEGIN {}, which does its thing immediately. */
09bef843 2992 newATTRSUB(floor,
79cb57f6 2993 newSVOP(OP_CONST, 0, newSVpvn("BEGIN", 5)),
4633a7c4 2994 Nullop,
09bef843 2995 Nullop,
a0d0e21e 2996 append_elem(OP_LINESEQ,
b1cb66bf 2997 append_elem(OP_LINESEQ,
2998 newSTATEOP(0, Nullch, rqop),
2999 newSTATEOP(0, Nullch, veop)),
a0d0e21e 3000 newSTATEOP(0, Nullch, imop) ));
85e6fe83 3001
c305c6a0 3002 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 3003 PL_copline = NOLINE;
3004 PL_expect = XSTATE;
85e6fe83
LW		 3005}
3006
79072805 3007OP *
864dbfa3 3008Perl_dofile(pTHX_ OP *term)
78ca652e
GS		 3009{
3010 OP *doop;
3011 GV *gv;
3012
3013 gv = gv_fetchpv("do", FALSE, SVt_PVCV);
3014 if (!(gv && GvIMPORTED_CV(gv)))
3015 gv = gv_fetchpv("CORE::GLOBAL::do", FALSE, SVt_PVCV);
3016
3017 if (gv && GvIMPORTED_CV(gv)) {
3018 doop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
3019 append_elem(OP_LIST, term,
3020 scalar(newUNOP(OP_RV2CV, 0,
3021 newGVOP(OP_GV, 0,
3022 gv))))));
3023 }
3024 else {
3025 doop = newUNOP(OP_DOFILE, 0, scalar(term));
3026 }
3027 return doop;
3028}
3029
3030OP *
864dbfa3 3031Perl_newSLICEOP(pTHX_ I32 flags, OP *subscript, OP *listval)
79072805
LW		 3032{
3033 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 3034 list(force_list(subscript)),
3035 list(force_list(listval)) );
79072805
LW		 3036}
3037
76e3520e 3038STATIC I32
cea2e8a9 3039S_list_assignment(pTHX_ register OP *o)
79072805 3040{
11343788 3041 if (!o)
79072805
LW		 3042 return TRUE;
3043
11343788
MB		 3044 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
3045 o = cUNOPo->op_first;
79072805 3046
11343788 3047 if (o->op_type == OP_COND_EXPR) {
1a67a97c
SM		 3048 I32 t = list_assignment(cLOGOPo->op_first->op_sibling);
3049 I32 f = list_assignment(cLOGOPo->op_first->op_sibling->op_sibling);
79072805
LW		 3050
3051 if (t && f)
3052 return TRUE;
3053 if (t || f)
3054 yyerror("Assignment to both a list and a scalar");
3055 return FALSE;
3056 }
3057
11343788
MB		 3058 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
3059 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
3060 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 3061 return TRUE;
3062
11343788 3063 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 3064 return TRUE;
3065
11343788 3066 if (o->op_type == OP_RV2SV)
79072805
LW		 3067 return FALSE;
3068
3069 return FALSE;
3070}
3071
3072OP *
864dbfa3 3073Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
79072805 3074{
11343788 3075 OP *o;
79072805 3076
a0d0e21e
LW		 3077 if (optype) {
3078 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN) {
3079 return newLOGOP(optype, 0,
3080 mod(scalar(left), optype),
3081 newUNOP(OP_SASSIGN, 0, scalar(right)));
3082 }
3083 else {
3084 return newBINOP(optype, OPf_STACKED,
3085 mod(scalar(left), optype), scalar(right));
3086 }
3087 }
3088
79072805 3089 if (list_assignment(left)) {
6ee623d5 3090 dTHR;
3280af22
NIS		 3091 PL_modcount = 0;
3092 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 3093 left = mod(left, OP_AASSIGN);
3280af22
NIS		 3094 if (PL_eval_start)
3095 PL_eval_start = 0;
748a9306 3096 else {
a0d0e21e
LW		 3097 op_free(left);
3098 op_free(right);
3099 return Nullop;
3100 }
11343788 3101 o = newBINOP(OP_AASSIGN, flags,
8990e307
LW		 3102 list(force_list(right)),
3103 list(force_list(left)) );
11343788 3104 o->op_private = 0 | (flags >> 8);
a0d0e21e 3105 if (!(left->op_private & OPpLVAL_INTRO)) {
79072805 3106 OP *curop;
11343788 3107 OP *lastop = o;
3280af22 3108 PL_generation++;
11343788 3109 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
22c35a8c 3110 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805
LW		 3111 if (curop->op_type == OP_GV) {
3112 GV *gv = ((GVOP*)curop)->op_gv;
3280af22 3113 if (gv == PL_defgv || SvCUR(gv) == PL_generation)
79072805 3114 break;
3280af22 3115 SvCUR(gv) = PL_generation;
79072805 3116 }
748a9306
LW		 3117 else if (curop->op_type == OP_PADSV ||
3118 curop->op_type == OP_PADAV ||
3119 curop->op_type == OP_PADHV ||
3120 curop->op_type == OP_PADANY) {
3280af22 3121 SV **svp = AvARRAY(PL_comppad_name);
8e07c86e 3122 SV *sv = svp[curop->op_targ];
3280af22 3123 if (SvCUR(sv) == PL_generation)
748a9306 3124 break;
3280af22 3125 SvCUR(sv) = PL_generation; /* (SvCUR not used any more) */
748a9306 3126 }
79072805
LW		 3127 else if (curop->op_type == OP_RV2CV)
3128 break;
3129 else if (curop->op_type == OP_RV2SV ||
3130 curop->op_type == OP_RV2AV ||
3131 curop->op_type == OP_RV2HV ||
3132 curop->op_type == OP_RV2GV) {
3133 if (lastop->op_type != OP_GV) /* funny deref? */
3134 break;
3135 }
1167e5da
SM		 3136 else if (curop->op_type == OP_PUSHRE) {
3137 if (((PMOP*)curop)->op_pmreplroot) {
3138 GV *gv = (GV*)((PMOP*)curop)->op_pmreplroot;
3280af22 3139 if (gv == PL_defgv || SvCUR(gv) == PL_generation)
1167e5da 3140 break;
3280af22 3141 SvCUR(gv) = PL_generation;
1167e5da
SM		 3142 }
3143 }
79072805
LW		 3144 else
3145 break;
3146 }
3147 lastop = curop;
3148 }
11343788
MB		 3149 if (curop != o)
3150 o->op_private = OPpASSIGN_COMMON;
79072805 3151 }
c07a80fd 3152 if (right && right->op_type == OP_SPLIT) {
3153 OP* tmpop;
3154 if ((tmpop = ((LISTOP*)right)->op_first) &&
3155 tmpop->op_type == OP_PUSHRE)
3156 {
3157 PMOP *pm = (PMOP*)tmpop;
3158 if (left->op_type == OP_RV2AV &&
3159 !(left->op_private & OPpLVAL_INTRO) &&
11343788 3160 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 3161 {
3162 tmpop = ((UNOP*)left)->op_first;
3163 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
3164 pm->op_pmreplroot = (OP*)((GVOP*)tmpop)->op_gv;
3165 pm->op_pmflags |= PMf_ONCE;
11343788 3166 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 3167 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
3168 tmpop->op_sibling = Nullop; /* don't free split */
3169 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 3170 op_free(o); /* blow off assign */
54310121 3171 right->op_flags &= ~OPf_WANT;
a5f75d66 3172 /* "I don't know and I don't care." */
c07a80fd 3173 return right;
3174 }
3175 }
3176 else {
3280af22 3177 if (PL_modcount < 10000 &&
c07a80fd 3178 ((LISTOP*)right)->op_last->op_type == OP_CONST)
3179 {
3180 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
3181 if (SvIVX(sv) == 0)
3280af22 3182 sv_setiv(sv, PL_modcount+1);
c07a80fd 3183 }
3184 }
3185 }
3186 }
11343788 3187 return o;
79072805
LW		 3188 }
3189 if (!right)
3190 right = newOP(OP_UNDEF, 0);
3191 if (right->op_type == OP_READLINE) {
3192 right->op_flags |= OPf_STACKED;
463ee0b2 3193 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 3194 }
a0d0e21e 3195 else {
3280af22 3196 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 3197 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 3198 scalar(right), mod(scalar(left), OP_SASSIGN) );
3280af22
NIS		 3199 if (PL_eval_start)
3200 PL_eval_start = 0;
748a9306 3201 else {
11343788 3202 op_free(o);
a0d0e21e
LW		 3203 return Nullop;
3204 }
3205 }
11343788 3206 return o;
79072805
LW		 3207}
3208
3209OP *
864dbfa3 3210Perl_newSTATEOP(pTHX_ I32 flags, char *label, OP *o)
79072805 3211{
11343788 3212 dTHR;
bbce6d69 3213 U32 seq = intro_my();
79072805
LW		 3214 register COP *cop;
3215
b7dc083c 3216 NewOp(1101, cop, 1, COP);
3280af22 3217 if (PERLDB_LINE && PL_curcop->cop_line && PL_curstash != PL_debstash) {
8990e307 3218 cop->op_type = OP_DBSTATE;
22c35a8c 3219 cop->op_ppaddr = PL_ppaddr[ OP_DBSTATE ];
8990e307
LW		 3220 }
3221 else {
3222 cop->op_type = OP_NEXTSTATE;
22c35a8c 3223 cop->op_ppaddr = PL_ppaddr[ OP_NEXTSTATE ];
8990e307 3224 }
79072805 3225 cop->op_flags = flags;
a0ed51b3 3226 cop->op_private = (PL_hints & HINT_UTF8);
ff0cee69 3227#ifdef NATIVE_HINTS
3228 cop->op_private |= NATIVE_HINTS;
3229#endif
e24b16f9 3230 PL_compiling.op_private = cop->op_private;
79072805
LW		 3231 cop->op_next = (OP*)cop;
3232
463ee0b2
LW		 3233 if (label) {
3234 cop->cop_label = label;
3280af22 3235 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 3236 }
bbce6d69 3237 cop->cop_seq = seq;
3280af22 3238 cop->cop_arybase = PL_curcop->cop_arybase;
0453d815 3239 if (specialWARN(PL_curcop->cop_warnings))
599cee73
PM		 3240 cop->cop_warnings = PL_curcop->cop_warnings ;
3241 else
3242 cop->cop_warnings = newSVsv(PL_curcop->cop_warnings) ;
3243
79072805 3244
3280af22
NIS		 3245 if (PL_copline == NOLINE)
3246 cop->cop_line = PL_curcop->cop_line;
79072805 3247 else {
3280af22
NIS		 3248 cop->cop_line = PL_copline;
3249 PL_copline = NOLINE;
79072805 3250 }
3280af22
NIS		 3251 cop->cop_filegv = (GV*)SvREFCNT_inc(PL_curcop->cop_filegv);
3252 cop->cop_stash = PL_curstash;
79072805 3253
3280af22
NIS		 3254 if (PERLDB_LINE && PL_curstash != PL_debstash) {
3255 SV **svp = av_fetch(GvAV(PL_curcop->cop_filegv),(I32)cop->cop_line, FALSE);
3256 if (svp && *svp != &PL_sv_undef && !SvIOK(*svp)) {
a0d0e21e 3257 (void)SvIOK_on(*svp);
a5f75d66 3258 SvIVX(*svp) = 1;
93a17b20
LW		 3259 SvSTASH(*svp) = (HV*)cop;
3260 }
3261 }
3262
11343788 3263 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 3264}
3265
bbce6d69 3266/* "Introduce" my variables to visible status. */
3267U32
864dbfa3 3268Perl_intro_my(pTHX)
bbce6d69 3269{
3270 SV **svp;
3271 SV *sv;
3272 I32 i;
3273
3280af22
NIS		 3274 if (! PL_min_intro_pending)
3275 return PL_cop_seqmax;
bbce6d69 3276
3280af22
NIS		 3277 svp = AvARRAY(PL_comppad_name);
3278 for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) {
3279 if ((sv = svp[i]) && sv != &PL_sv_undef && !SvIVX(sv)) {
c53d7c7d 3280 SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */
65202027 3281 SvNVX(sv) = (NV)PL_cop_seqmax;
bbce6d69 3282 }
3283 }
3280af22
NIS		 3284 PL_min_intro_pending = 0;
3285 PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */
3286 return PL_cop_seqmax++;
bbce6d69 3287}
3288
79072805 3289OP *
864dbfa3 3290Perl_newLOGOP(pTHX_ I32 type, I32 flags, OP *first, OP *other)
79072805 3291{
883ffac3
CS		 3292 return new_logop(type, flags, &first, &other);
3293}
3294
3bd495df 3295STATIC OP *
cea2e8a9 3296S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
883ffac3 3297{
11343788 3298 dTHR;
79072805 3299 LOGOP *logop;
11343788 3300 OP *o;
883ffac3
CS		 3301 OP *first = *firstp;
3302 OP *other = *otherp;
79072805 3303
a0d0e21e
LW		 3304 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
3305 return newBINOP(type, flags, scalar(first), scalar(other));
3306
8990e307 3307 scalarboolean(first);
79072805
LW		 3308 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
3309 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
3310 if (type == OP_AND || type == OP_OR) {
3311 if (type == OP_AND)
3312 type = OP_OR;
3313 else
3314 type = OP_AND;
11343788 3315 o = first;
883ffac3 3316 first = *firstp = cUNOPo->op_first;
11343788
MB		 3317 if (o->op_next)
3318 first->op_next = o->op_next;
3319 cUNOPo->op_first = Nullop;
3320 op_free(o);
79072805
LW		 3321 }
3322 }
3323 if (first->op_type == OP_CONST) {
599cee73 3324 if (ckWARN(WARN_PRECEDENCE) && (first->op_private & OPpCONST_BARE))
cea2e8a9 3325 Perl_warner(aTHX_ WARN_PRECEDENCE, "Probable precedence problem on %s",
22c35a8c 3326 PL_op_desc[type]);
79072805
LW		 3327 if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
3328 op_free(first);
883ffac3 3329 *firstp = Nullop;
79072805
LW		 3330 return other;
3331 }
3332 else {
3333 op_free(other);
883ffac3 3334 *otherp = Nullop;
79072805
LW		 3335 return first;
3336 }
3337 }
3338 else if (first->op_type == OP_WANTARRAY) {
3339 if (type == OP_AND)
3340 list(other);
3341 else
3342 scalar(other);
3343 }
599cee73 3344 else if (ckWARN(WARN_UNSAFE) && (first->op_flags & OPf_KIDS)) {
a6006777 3345 OP *k1 = ((UNOP*)first)->op_first;
3346 OP *k2 = k1->op_sibling;
3347 OPCODE warnop = 0;
3348 switch (first->op_type)
3349 {
3350 case OP_NULL:
3351 if (k2 && k2->op_type == OP_READLINE
3352 && (k2->op_flags & OPf_STACKED)
55d729e4 3353 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
a6006777 3354 warnop = k2->op_type;
3355 break;
3356
3357 case OP_SASSIGN:
68dc0745 3358 if (k1->op_type == OP_READDIR
3359 || k1->op_type == OP_GLOB
3360 || k1->op_type == OP_EACH)
a6006777 3361 warnop = k1->op_type;
3362 break;
3363 }
8ebc5c01 3364 if (warnop) {
3280af22
NIS		 3365 line_t oldline = PL_curcop->cop_line;
3366 PL_curcop->cop_line = PL_copline;
cea2e8a9 3367 Perl_warner(aTHX_ WARN_UNSAFE,
599cee73 3368 "Value of %s%s can be \"0\"; test with defined()",
22c35a8c 3369 PL_op_desc[warnop],
68dc0745 3370 ((warnop == OP_READLINE || warnop == OP_GLOB)
3371 ? " construct" : "() operator"));
3280af22 3372 PL_curcop->cop_line = oldline;
8ebc5c01 3373 }
a6006777 3374 }
79072805
LW		 3375
3376 if (!other)
3377 return first;
3378
a0d0e21e
LW		 3379 if (type == OP_ANDASSIGN || type == OP_ORASSIGN)
3380 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
3381
b7dc083c 3382 NewOp(1101, logop, 1, LOGOP);
79072805
LW		 3383
3384 logop->op_type = type;
22c35a8c 3385 logop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3386 logop->op_first = first;
3387 logop->op_flags = flags | OPf_KIDS;
3388 logop->op_other = LINKLIST(other);
c07a80fd 3389 logop->op_private = 1 | (flags >> 8);
79072805
LW		 3390
3391 /* establish postfix order */
3392 logop->op_next = LINKLIST(first);
3393 first->op_next = (OP*)logop;
3394 first->op_sibling = other;
3395
11343788
MB		 3396 o = newUNOP(OP_NULL, 0, (OP*)logop);
3397 other->op_next = o;
79072805 3398
11343788 3399 return o;
79072805
LW		 3400}
3401
3402OP *
864dbfa3 3403Perl_newCONDOP(pTHX_ I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 3404{
11343788 3405 dTHR;
1a67a97c
SM		 3406 LOGOP *logop;
3407 OP *start;
11343788 3408 OP *o;
79072805 3409
b1cb66bf 3410 if (!falseop)
3411 return newLOGOP(OP_AND, 0, first, trueop);
3412 if (!trueop)
3413 return newLOGOP(OP_OR, 0, first, falseop);
79072805 3414
8990e307 3415 scalarboolean(first);
79072805
LW		 3416 if (first->op_type == OP_CONST) {
3417 if (SvTRUE(((SVOP*)first)->op_sv)) {
3418 op_free(first);
b1cb66bf 3419 op_free(falseop);
3420 return trueop;
79072805
LW		 3421 }
3422 else {
3423 op_free(first);
b1cb66bf 3424 op_free(trueop);
3425 return falseop;
79072805
LW		 3426 }
3427 }
3428 else if (first->op_type == OP_WANTARRAY) {
b1cb66bf 3429 list(trueop);
3430 scalar(falseop);
79072805 3431 }
1a67a97c
SM		 3432 NewOp(1101, logop, 1, LOGOP);
3433 logop->op_type = OP_COND_EXPR;
3434 logop->op_ppaddr = PL_ppaddr[OP_COND_EXPR];
3435 logop->op_first = first;
3436 logop->op_flags = flags | OPf_KIDS;
3437 logop->op_private = 1 | (flags >> 8);
3438 logop->op_other = LINKLIST(trueop);
3439 logop->op_next = LINKLIST(falseop);
79072805 3440
79072805
LW		 3441
3442 /* establish postfix order */
1a67a97c
SM		 3443 start = LINKLIST(first);
3444 first->op_next = (OP*)logop;
79072805 3445
b1cb66bf 3446 first->op_sibling = trueop;
3447 trueop->op_sibling = falseop;
1a67a97c 3448 o = newUNOP(OP_NULL, 0, (OP*)logop);
79072805 3449
1a67a97c 3450 trueop->op_next = falseop->op_next = o;
79072805 3451
1a67a97c 3452 o->op_next = start;
11343788 3453 return o;
79072805
LW		 3454}
3455
3456OP *
864dbfa3 3457Perl_newRANGE(pTHX_ I32 flags, OP *left, OP *right)
79072805 3458{
b35b2403 3459 dTHR;
1a67a97c 3460 LOGOP *range;
79072805
LW		 3461 OP *flip;
3462 OP *flop;
1a67a97c 3463 OP *leftstart;
11343788 3464 OP *o;
79072805 3465
1a67a97c 3466 NewOp(1101, range, 1, LOGOP);
79072805 3467
1a67a97c
SM		 3468 range->op_type = OP_RANGE;
3469 range->op_ppaddr = PL_ppaddr[OP_RANGE];
3470 range->op_first = left;
3471 range->op_flags = OPf_KIDS;
3472 leftstart = LINKLIST(left);
3473 range->op_other = LINKLIST(right);
3474 range->op_private = 1 | (flags >> 8);
79072805
LW		 3475
3476 left->op_sibling = right;
3477
1a67a97c
SM		 3478 range->op_next = (OP*)range;
3479 flip = newUNOP(OP_FLIP, flags, (OP*)range);
79072805 3480 flop = newUNOP(OP_FLOP, 0, flip);
11343788 3481 o = newUNOP(OP_NULL, 0, flop);
79072805 3482 linklist(flop);
1a67a97c 3483 range->op_next = leftstart;
79072805
LW		 3484
3485 left->op_next = flip;
3486 right->op_next = flop;
3487
1a67a97c
SM		 3488 range->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
3489 sv_upgrade(PAD_SV(range->op_targ), SVt_PVNV);
ed6116ce 3490 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 3491 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
3492
3493 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3494 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3495
11343788 3496 flip->op_next = o;
79072805 3497 if (!flip->op_private || !flop->op_private)
11343788 3498 linklist(o); /* blow off optimizer unless constant */
79072805 3499
11343788 3500 return o;
79072805
LW		 3501}
3502
3503OP *
864dbfa3 3504Perl_newLOOPOP(pTHX_ I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 3505{
11343788 3506 dTHR;
463ee0b2 3507 OP* listop;
11343788 3508 OP* o;
463ee0b2 3509 int once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 3510 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
93a17b20 3511
463ee0b2
LW		 3512 if (expr) {
3513 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
3514 return block; /* do {} while 0 does once */
fb73857a 3515 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3516 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 3517 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3518 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 3519 } else if (expr->op_flags & OPf_KIDS) {
3520 OP *k1 = ((UNOP*)expr)->op_first;
3521 OP *k2 = (k1) ? k1->op_sibling : NULL;
3522 switch (expr->op_type) {
3523 case OP_NULL:
3524 if (k2 && k2->op_type == OP_READLINE
3525 && (k2->op_flags & OPf_STACKED)
3526 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
3527 expr = newUNOP(OP_DEFINED, 0, expr);
3528 break;
3529
3530 case OP_SASSIGN:
3531 if (k1->op_type == OP_READDIR
3532 || k1->op_type == OP_GLOB
3533 || k1->op_type == OP_EACH)
3534 expr = newUNOP(OP_DEFINED, 0, expr);
3535 break;
3536 }
774d564b 3537 }
463ee0b2 3538 }
93a17b20 3539
8990e307 3540 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
883ffac3 3541 o = new_logop(OP_AND, 0, &expr, &listop);
463ee0b2 3542
883ffac3
CS		 3543 if (listop)
3544 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 3545
11343788
MB		 3546 if (once && o != listop)
3547 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 3548
11343788
MB		 3549 if (o == listop)
3550 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 3551
11343788
MB		 3552 o->op_flags |= flags;
3553 o = scope(o);
3554 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
3555 return o;
79072805
LW		 3556}
3557
3558OP *
864dbfa3 3559Perl_newWHILEOP(pTHX_ I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *expr, OP *block, OP *cont)
79072805 3560{
11343788 3561 dTHR;
79072805
LW		 3562 OP *redo;
3563 OP *next = 0;
3564 OP *listop;
11343788 3565 OP *o;
79072805
LW		 3566 OP *condop;
3567
fb73857a 3568 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3569 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB))) {
748a9306 3570 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3571 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 3572 } else if (expr && (expr->op_flags & OPf_KIDS)) {
3573 OP *k1 = ((UNOP*)expr)->op_first;
3574 OP *k2 = (k1) ? k1->op_sibling : NULL;
3575 switch (expr->op_type) {
3576 case OP_NULL:
3577 if (k2 && k2->op_type == OP_READLINE
3578 && (k2->op_flags & OPf_STACKED)
3579 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
3580 expr = newUNOP(OP_DEFINED, 0, expr);
3581 break;
3582
3583 case OP_SASSIGN:
3584 if (k1->op_type == OP_READDIR
3585 || k1->op_type == OP_GLOB
3586 || k1->op_type == OP_EACH)
3587 expr = newUNOP(OP_DEFINED, 0, expr);
3588 break;
3589 }
748a9306 3590 }
79072805
LW		 3591
3592 if (!block)
3593 block = newOP(OP_NULL, 0);
3594
3595 if (cont)
3596 next = LINKLIST(cont);
fb73857a 3597 if (expr) {
79072805 3598 cont = append_elem(OP_LINESEQ, cont, newOP(OP_UNSTACK, 0));
fb73857a 3599 if ((line_t)whileline != NOLINE) {
3280af22 3600 PL_copline = whileline;
fb73857a 3601 cont = append_elem(OP_LINESEQ, cont,
3602 newSTATEOP(0, Nullch, Nullop));
3603 }
3604 }
79072805 3605
463ee0b2 3606 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 3607 redo = LINKLIST(listop);
3608
3609 if (expr) {
3280af22 3610 PL_copline = whileline;
883ffac3
CS		 3611 scalar(listop);
3612 o = new_logop(OP_AND, 0, &expr, &listop);
11343788 3613 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 3614 op_free(expr); /* oops, it's a while (0) */
463ee0b2 3615 op_free((OP*)loop);
883ffac3 3616 return Nullop; /* listop already freed by new_logop */
463ee0b2 3617 }
883ffac3
CS		 3618 if (listop)
3619 ((LISTOP*)listop)->op_last->op_next = condop =
3620 (o == listop ? redo : LINKLIST(o));
79072805
LW		 3621 if (!next)
3622 next = condop;
3623 }
3624 else
11343788 3625 o = listop;
79072805
LW		 3626
3627 if (!loop) {
b7dc083c 3628 NewOp(1101,loop,1,LOOP);
79072805 3629 loop->op_type = OP_ENTERLOOP;
22c35a8c 3630 loop->op_ppaddr = PL_ppaddr[OP_ENTERLOOP];
79072805
LW		 3631 loop->op_private = 0;
3632 loop->op_next = (OP*)loop;
3633 }
3634
11343788 3635 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 3636
3637 loop->op_redoop = redo;
11343788 3638 loop->op_lastop = o;
79072805
LW		 3639
3640 if (next)
3641 loop->op_nextop = next;
3642 else
11343788 3643 loop->op_nextop = o;
79072805 3644
11343788
MB		 3645 o->op_flags |= flags;
3646 o->op_private |= (flags >> 8);
3647 return o;
79072805
LW		 3648}
3649
3650OP *
864dbfa3 3651Perl_newFOROP(pTHX_ I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *block,OP *cont)
79072805
LW		 3652{
3653 LOOP *loop;
b7dc083c 3654 LOOP *tmp;
fb73857a 3655 OP *wop;
85e6fe83 3656 int padoff = 0;
4633a7c4 3657 I32 iterflags = 0;
79072805 3658
79072805 3659 if (sv) {
85e6fe83 3660 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
748a9306 3661 sv->op_type = OP_RV2GV;
22c35a8c 3662 sv->op_ppaddr = PL_ppaddr[OP_RV2GV];
79072805 3663 }
85e6fe83
LW		 3664 else if (sv->op_type == OP_PADSV) { /* private variable */
3665 padoff = sv->op_targ;
3666 op_free(sv);
3667 sv = Nullop;
3668 }
54b9620d
MB		 3669 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
3670 padoff = sv->op_targ;
3671 iterflags |= OPf_SPECIAL;
3672 op_free(sv);
3673 sv = Nullop;
3674 }
79072805 3675 else
cea2e8a9 3676 Perl_croak(aTHX_ "Can't use %s for loop variable", PL_op_desc[sv->op_type]);
79072805
LW		 3677 }
3678 else {
54b9620d
MB		 3679#ifdef USE_THREADS
3680 padoff = find_threadsv("_");
3681 iterflags |= OPf_SPECIAL;
3682#else
3280af22 3683 sv = newGVOP(OP_GV, 0, PL_defgv);
54b9620d 3684#endif
79072805 3685 }
5f05dabc 3686 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
89ea2908 3687 expr = mod(force_list(scalar(ref(expr, OP_ITER))), OP_GREPSTART);
4633a7c4
LW		 3688 iterflags |= OPf_STACKED;
3689 }
89ea2908
GA		 3690 else if (expr->op_type == OP_NULL &&
3691 (expr->op_flags & OPf_KIDS) &&
3692 ((BINOP*)expr)->op_first->op_type == OP_FLOP)
3693 {
3694 /* Basically turn for($x..$y) into the same as for($x,$y), but we
3695 * set the STACKED flag to indicate that these values are to be
3696 * treated as min/max values by 'pp_iterinit'.
3697 */
3698 UNOP* flip = (UNOP*)((UNOP*)((BINOP*)expr)->op_first)->op_first;
1a67a97c 3699 LOGOP* range = (LOGOP*) flip->op_first;
89ea2908
GA		 3700 OP* left = range->op_first;
3701 OP* right = left->op_sibling;
5152d7c7 3702 LISTOP* listop;
89ea2908
GA		 3703
3704 range->op_flags &= ~OPf_KIDS;
3705 range->op_first = Nullop;
3706
5152d7c7 3707 listop = (LISTOP*)newLISTOP(OP_LIST, 0, left, right);
1a67a97c
SM		 3708 listop->op_first->op_next = range->op_next;
3709 left->op_next = range->op_other;
5152d7c7
GS		 3710 right->op_next = (OP*)listop;
3711 listop->op_next = listop->op_first;
89ea2908
GA		 3712
3713 op_free(expr);
5152d7c7 3714 expr = (OP*)(listop);
89ea2908
GA		 3715 null(expr);
3716 iterflags |= OPf_STACKED;
3717 }
3718 else {
3719 expr = mod(force_list(expr), OP_GREPSTART);
3720 }
3721
3722
4633a7c4 3723 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
89ea2908 3724 append_elem(OP_LIST, expr, scalar(sv))));
85e6fe83 3725 assert(!loop->op_next);
b7dc083c
NIS		 3726#ifdef PL_OP_SLAB_ALLOC
3727 NewOp(1234,tmp,1,LOOP);
3728 Copy(loop,tmp,1,LOOP);
3729 loop = tmp;
3730#else
85e6fe83 3731 Renew(loop, 1, LOOP);
b7dc083c 3732#endif
85e6fe83 3733 loop->op_targ = padoff;
fb73857a 3734 wop = newWHILEOP(flags, 1, loop, forline, newOP(OP_ITER, 0), block, cont);
3280af22 3735 PL_copline = forline;
fb73857a 3736 return newSTATEOP(0, label, wop);
79072805
LW		 3737}
3738
8990e307 3739OP*
864dbfa3 3740Perl_newLOOPEX(pTHX_ I32 type, OP *label)
8990e307 3741{
11343788
MB		 3742 dTHR;
3743 OP *o;
2d8e6c8d
GS		 3744 STRLEN n_a;
3745
8990e307 3746 if (type != OP_GOTO || label->op_type == OP_CONST) {
cdaebead
MB		 3747 /* "last()" means "last" */
3748 if (label->op_type == OP_STUB && (label->op_flags & OPf_PARENS))
3749 o = newOP(type, OPf_SPECIAL);
3750 else {
3751 o = newPVOP(type, 0, savepv(label->op_type == OP_CONST
2d8e6c8d 3752 ? SvPVx(((SVOP*)label)->op_sv, n_a)
cdaebead
MB		 3753 : ""));
3754 }
8990e307
LW		 3755 op_free(label);
3756 }
3757 else {
a0d0e21e
LW		 3758 if (label->op_type == OP_ENTERSUB)
3759 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
11343788 3760 o = newUNOP(type, OPf_STACKED, label);
8990e307 3761 }
3280af22 3762 PL_hints |= HINT_BLOCK_SCOPE;
11343788 3763 return o;
8990e307
LW		 3764}
3765
79072805 3766void
864dbfa3 3767Perl_cv_undef(pTHX_ CV *cv)
79072805 3768{
11343788
MB		 3769 dTHR;
3770#ifdef USE_THREADS
e858de61
MB		 3771 if (CvMUTEXP(cv)) {
3772 MUTEX_DESTROY(CvMUTEXP(cv));
3773 Safefree(CvMUTEXP(cv));
3774 CvMUTEXP(cv) = 0;
3775 }
11343788
MB		 3776#endif /* USE_THREADS */
3777
a0d0e21e 3778 if (!CvXSUB(cv) && CvROOT(cv)) {
11343788
MB		 3779#ifdef USE_THREADS
3780 if (CvDEPTH(cv) || (CvOWNER(cv) && CvOWNER(cv) != thr))
cea2e8a9 3781 Perl_croak(aTHX_ "Can't undef active subroutine");
11343788 3782#else
a0d0e21e 3783 if (CvDEPTH(cv))
cea2e8a9 3784 Perl_croak(aTHX_ "Can't undef active subroutine");
11343788 3785#endif /* USE_THREADS */
8990e307 3786 ENTER;
a0d0e21e 3787
3280af22
NIS		 3788 SAVESPTR(PL_curpad);
3789 PL_curpad = 0;
a0d0e21e 3790
a5f75d66 3791 if (!CvCLONED(cv))
748a9306 3792 op_free(CvROOT(cv));
79072805 3793 CvROOT(cv) = Nullop;
8990e307 3794 LEAVE;
79072805 3795 }
1d5db326 3796 SvPOK_off((SV*)cv); /* forget prototype */
44a8e56a 3797 CvFLAGS(cv) = 0;
8e07c86e
AD		 3798 SvREFCNT_dec(CvGV(cv));
3799 CvGV(cv) = Nullgv;
3800 SvREFCNT_dec(CvOUTSIDE(cv));
3801 CvOUTSIDE(cv) = Nullcv;
3802 if (CvPADLIST(cv)) {
8ebc5c01 3803 /* may be during global destruction */
3804 if (SvREFCNT(CvPADLIST(cv))) {
93965878 3805 I32 i = AvFILLp(CvPADLIST(cv));
8ebc5c01 3806 while (i >= 0) {
3807 SV** svp = av_fetch(CvPADLIST(cv), i--, FALSE);
46fc3d4c 3808 SV* sv = svp ? *svp : Nullsv;
3809 if (!sv)
3810 continue;
3280af22
NIS		 3811 if (sv == (SV*)PL_comppad_name)
3812 PL_comppad_name = Nullav;
3813 else if (sv == (SV*)PL_comppad) {
3814 PL_comppad = Nullav;
3815 PL_curpad = Null(SV**);
46fc3d4c 3816 }
3817 SvREFCNT_dec(sv);
8ebc5c01 3818 }
3819 SvREFCNT_dec((SV*)CvPADLIST(cv));
8e07c86e 3820 }
8e07c86e
AD		 3821 CvPADLIST(cv) = Nullav;
3822 }
79072805
LW		 3823}
3824
5f05dabc 3825#ifdef DEBUG_CLOSURES
76e3520e 3826STATIC void
ba106d47 3827cv_dump(CV *cv)
5f05dabc 3828{
3829 CV *outside = CvOUTSIDE(cv);
3830 AV* padlist = CvPADLIST(cv);
4fdae800 3831 AV* pad_name;
3832 AV* pad;
3833 SV** pname;
3834 SV** ppad;
5f05dabc 3835 I32 ix;
3836
fb73857a 3837 PerlIO_printf(Perl_debug_log, "\tCV=0x%lx (%s), OUTSIDE=0x%lx (%s)\n",
ab50184a
CS		 3838 cv,
3839 (CvANON(cv) ? "ANON"
6b88bc9c 3840 : (cv == PL_main_cv) ? "MAIN"
33b8ce05 3841 : CvUNIQUE(cv) ? "UNIQUE"
44a8e56a 3842 : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
ab50184a
CS		 3843 outside,
3844 (!outside ? "null"
3845 : CvANON(outside) ? "ANON"
6b88bc9c 3846 : (outside == PL_main_cv) ? "MAIN"
07055b4c 3847 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 3848 : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
5f05dabc 3849
4fdae800 3850 if (!padlist)
3851 return;
3852
3853 pad_name = (AV*)*av_fetch(padlist, 0, FALSE);
3854 pad = (AV*)*av_fetch(padlist, 1, FALSE);
3855 pname = AvARRAY(pad_name);
3856 ppad = AvARRAY(pad);
3857
93965878 3858 for (ix = 1; ix <= AvFILLp(pad_name); ix++) {
5f05dabc 3859 if (SvPOK(pname[ix]))
fb73857a 3860 PerlIO_printf(Perl_debug_log, "\t%4d. 0x%lx (%s\"%s\" %ld-%ld)\n",
4fdae800 3861 ix, ppad[ix],
3862 SvFAKE(pname[ix]) ? "FAKE " : "",
3863 SvPVX(pname[ix]),
ab50184a
CS		 3864 (long)I_32(SvNVX(pname[ix])),
3865 (long)SvIVX(pname[ix]));
5f05dabc 3866 }
3867}
3868#endif /* DEBUG_CLOSURES */
3869
76e3520e 3870STATIC CV *
cea2e8a9 3871S_cv_clone2(pTHX_ CV *proto, CV *outside)
748a9306 3872{
11343788 3873 dTHR;
748a9306
LW		 3874 AV* av;
3875 I32 ix;
3876 AV* protopadlist = CvPADLIST(proto);
3877 AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE);
3878 AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE);
5f05dabc 3879 SV** pname = AvARRAY(protopad_name);
3880 SV** ppad = AvARRAY(protopad);
93965878
NIS		 3881 I32 fname = AvFILLp(protopad_name);
3882 I32 fpad = AvFILLp(protopad);
748a9306
LW		 3883 AV* comppadlist;
3884 CV* cv;
3885
07055b4c
CS		 3886 assert(!CvUNIQUE(proto));
3887
748a9306 3888 ENTER;
3280af22
NIS		 3889 SAVESPTR(PL_curpad);
3890 SAVESPTR(PL_comppad);
3891 SAVESPTR(PL_comppad_name);
3892 SAVESPTR(PL_compcv);
748a9306 3893
3280af22 3894 cv = PL_compcv = (CV*)NEWSV(1104,0);
fa83b5b6 3895 sv_upgrade((SV *)cv, SvTYPE(proto));
a5f75d66 3896 CvCLONED_on(cv);
5f05dabc 3897 if (CvANON(proto))
3898 CvANON_on(cv);
748a9306 3899
11343788 3900#ifdef USE_THREADS
12ca11f6 3901 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3902 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 3903 CvOWNER(cv) = 0;
3904#endif /* USE_THREADS */
748a9306 3905 CvFILEGV(cv) = CvFILEGV(proto);
44a8e56a 3906 CvGV(cv) = (GV*)SvREFCNT_inc(CvGV(proto));
748a9306
LW		 3907 CvSTASH(cv) = CvSTASH(proto);
3908 CvROOT(cv) = CvROOT(proto);
3909 CvSTART(cv) = CvSTART(proto);
5f05dabc 3910 if (outside)
3911 CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside);
748a9306 3912
68dc0745 3913 if (SvPOK(proto))
3914 sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto));
3915
3280af22 3916 PL_comppad_name = newAV();
46fc3d4c 3917 for (ix = fname; ix >= 0; ix--)
3280af22 3918 av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix]));
748a9306 3919
3280af22 3920 PL_comppad = newAV();
748a9306
LW		 3921
3922 comppadlist = newAV();
3923 AvREAL_off(comppadlist);
3280af22
NIS		 3924 av_store(comppadlist, 0, (SV*)PL_comppad_name);
3925 av_store(comppadlist, 1, (SV*)PL_comppad);
748a9306 3926 CvPADLIST(cv) = comppadlist;
3280af22
NIS		 3927 av_fill(PL_comppad, AvFILLp(protopad));
3928 PL_curpad = AvARRAY(PL_comppad);
748a9306
LW		 3929
3930 av = newAV(); /* will be @_ */
3931 av_extend(av, 0);
3280af22 3932 av_store(PL_comppad, 0, (SV*)av);
748a9306
LW		 3933 AvFLAGS(av) = AVf_REIFY;
3934
9607fc9c 3935 for (ix = fpad; ix > 0; ix--) {
3936 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
3280af22 3937 if (namesv && namesv != &PL_sv_undef) {
aa689395 3938 char *name = SvPVX(namesv); /* XXX */
3939 if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */
3940 I32 off = pad_findlex(name, ix, SvIVX(namesv),
2680586e 3941 CvOUTSIDE(cv), cxstack_ix, 0, 0);
5f05dabc 3942 if (!off)
3280af22 3943 PL_curpad[ix] = SvREFCNT_inc(ppad[ix]);
5f05dabc 3944 else if (off != ix)
cea2e8a9 3945 Perl_croak(aTHX_ "panic: cv_clone: %s", name);
748a9306
LW		 3946 }
3947 else { /* our own lexical */
aa689395 3948 SV* sv;
5f05dabc 3949 if (*name == '&') {
3950 /* anon code -- we'll come back for it */
3951 sv = SvREFCNT_inc(ppad[ix]);
3952 }
3953 else if (*name == '@')
3954 sv = (SV*)newAV();
748a9306 3955 else if (*name == '%')
5f05dabc 3956 sv = (SV*)newHV();
748a9306 3957 else
5f05dabc 3958 sv = NEWSV(0,0);
3959 if (!SvPADBUSY(sv))
3960 SvPADMY_on(sv);
3280af22 3961 PL_curpad[ix] = sv;
748a9306
LW		 3962 }
3963 }
3964 else {
aa689395 3965 SV* sv = NEWSV(0,0);
748a9306 3966 SvPADTMP_on(sv);
3280af22 3967 PL_curpad[ix] = sv;
748a9306
LW		 3968 }
3969 }
3970
5f05dabc 3971 /* Now that vars are all in place, clone nested closures. */
3972
9607fc9c 3973 for (ix = fpad; ix > 0; ix--) {
3974 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
aa689395 3975 if (namesv
3280af22 3976 && namesv != &PL_sv_undef
aa689395 3977 && !(SvFLAGS(namesv) & SVf_FAKE)
3978 && *SvPVX(namesv) == '&'
5f05dabc 3979 && CvCLONE(ppad[ix]))
3980 {
3981 CV *kid = cv_clone2((CV*)ppad[ix], cv);
3982 SvREFCNT_dec(ppad[ix]);
3983 CvCLONE_on(kid);
3984 SvPADMY_on(kid);
3280af22 3985 PL_curpad[ix] = (SV*)kid;
748a9306
LW		 3986 }
3987 }
3988
5f05dabc 3989#ifdef DEBUG_CLOSURES
ab50184a
CS		 3990 PerlIO_printf(Perl_debug_log, "Cloned inside:\n");
3991 cv_dump(outside);
3992 PerlIO_printf(Perl_debug_log, " from:\n");
5f05dabc 3993 cv_dump(proto);
ab50184a 3994 PerlIO_printf(Perl_debug_log, " to:\n");
5f05dabc 3995 cv_dump(cv);
3996#endif
3997
748a9306
LW		 3998 LEAVE;
3999 return cv;
4000}
4001
4002CV *
864dbfa3 4003Perl_cv_clone(pTHX_ CV *proto)
5f05dabc 4004{
b099ddc0
GS		 4005 CV *cv;
4006 MUTEX_LOCK(&PL_cred_mutex); /* XXX create separate mutex */
4007 cv = cv_clone2(proto, CvOUTSIDE(proto));
4008 MUTEX_UNLOCK(&PL_cred_mutex); /* XXX create separate mutex */
4009 return cv;
5f05dabc 4010}
4011
3fe9a6f1 4012void
864dbfa3 4013Perl_cv_ckproto(pTHX_ CV *cv, GV *gv, char *p)
3fe9a6f1 4014{
0453d815
PM		 4015 dTHR;
4016
f248d071 4017 if (((!p != !SvPOK(cv)) || (p && strNE(p, SvPVX(cv)))) && ckWARN_d(WARN_UNSAFE)) {
46fc3d4c 4018 SV* msg = sv_newmortal();
3fe9a6f1 4019 SV* name = Nullsv;
4020
4021 if (gv)
46fc3d4c 4022 gv_efullname3(name = sv_newmortal(), gv, Nullch);
4023 sv_setpv(msg, "Prototype mismatch:");
4024 if (name)
cea2e8a9 4025 Perl_sv_catpvf(aTHX_ msg, " sub %_", name);
3fe9a6f1 4026 if (SvPOK(cv))
cea2e8a9 4027 Perl_sv_catpvf(aTHX_ msg, " (%s)", SvPVX(cv));
46fc3d4c 4028 sv_catpv(msg, " vs ");
4029 if (p)
cea2e8a9 4030 Perl_sv_catpvf(aTHX_ msg, "(%s)", p);
46fc3d4c 4031 else
4032 sv_catpv(msg, "none");
0453d815 4033 Perl_warner(aTHX_ WARN_UNSAFE, "%_", msg);
3fe9a6f1 4034 }
4035}
4036
760ac839 4037SV *
864dbfa3 4038Perl_cv_const_sv(pTHX_ CV *cv)
760ac839 4039{
54310121 4040 if (!cv || !SvPOK(cv) || SvCUR(cv))
4041 return Nullsv;
fe5e78ed
GS		 4042 return op_const_sv(CvSTART(cv), cv);
4043}
760ac839 4044
fe5e78ed 4045SV *
864dbfa3 4046Perl_op_const_sv(pTHX_ OP *o, CV *cv)
fe5e78ed
GS		 4047{
4048 SV *sv = Nullsv;
4049
4050 if(!o)
4051 return Nullsv;
4052
4053 if(o->op_type == OP_LINESEQ && cLISTOPo->op_first)
4054 o = cLISTOPo->op_first->op_sibling;
4055
4056 for (; o; o = o->op_next) {
54310121 4057 OPCODE type = o->op_type;
fe5e78ed 4058
acb36ea4 4059 if (sv && o->op_next == o)
fe5e78ed 4060 return sv;
54310121 4061 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
4062 continue;
4063 if (type == OP_LEAVESUB || type == OP_RETURN)
4064 break;
4065 if (sv)
4066 return Nullsv;
4067 if (type == OP_CONST)
5dc0d613 4068 sv = cSVOPo->op_sv;
fe5e78ed 4069 else if (type == OP_PADSV && cv) {
e858de61
MB		 4070 AV* padav = (AV*)(AvARRAY(CvPADLIST(cv))[1]);
4071 sv = padav ? AvARRAY(padav)[o->op_targ] : Nullsv;
5aabfad6 4072 if (!sv || (!SvREADONLY(sv) && SvREFCNT(sv) > 1))
54310121 4073 return Nullsv;
760ac839 4074 }
54310121 4075 else
4076 return Nullsv;
760ac839 4077 }
5aabfad6 4078 if (sv)
4079 SvREADONLY_on(sv);
760ac839
LW		 4080 return sv;
4081}
4082
09bef843
SB		 4083void
4084Perl_newMYSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
4085{
4086 if (o)
4087 SAVEFREEOP(o);
4088 if (proto)
4089 SAVEFREEOP(proto);
4090 if (attrs)
4091 SAVEFREEOP(attrs);
4092 if (block)
4093 SAVEFREEOP(block);
4094 Perl_croak(aTHX_ "\"my sub\" not yet implemented");
4095}
4096
748a9306 4097CV *
864dbfa3 4098Perl_newSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *block)
79072805 4099{
09bef843
SB		 4100 return Perl_newATTRSUB(aTHX_ floor, o, proto, Nullop, block);
4101}
4102
4103CV *
4104Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
4105{
11343788 4106 dTHR;
2d8e6c8d
GS		 4107 STRLEN n_a;
4108 char *name = o ? SvPVx(cSVOPo->op_sv, n_a) : Nullch;
55d729e4 4109 GV *gv = gv_fetchpv(name ? name : "__ANON__",
09bef843
SB		 4110 GV_ADDMULTI | ((block || attrs) ? 0 : GV_NOINIT),
4111 SVt_PVCV);
2d8e6c8d 4112 char *ps = proto ? SvPVx(((SVOP*)proto)->op_sv, n_a) : Nullch;
a2008d6d 4113 register CV *cv=0;
a0d0e21e 4114 I32 ix;
79072805 4115
11343788 4116 if (o)
5dc0d613 4117 SAVEFREEOP(o);
3fe9a6f1 4118 if (proto)
4119 SAVEFREEOP(proto);
09bef843
SB		 4120 if (attrs)
4121 SAVEFREEOP(attrs);
3fe9a6f1 4122
09bef843 4123 if (SvTYPE(gv) != SVt_PVGV) { /* Maybe prototype now, and had at
55d729e4
GS		 4124 maximum a prototype before. */
4125 if (SvTYPE(gv) > SVt_NULL) {
0453d815 4126 if (!SvPOK((SV*)gv) && !(SvIOK((SV*)gv) && SvIVX((SV*)gv) == -1)
f248d071
GS		 4127 && ckWARN_d(WARN_UNSAFE))
4128 {
0453d815 4129 Perl_warner(aTHX_ WARN_UNSAFE, "Runaway prototype");
f248d071 4130 }
55d729e4
GS		 4131 cv_ckproto((CV*)gv, NULL, ps);
4132 }
4133 if (ps)
4134 sv_setpv((SV*)gv, ps);
4135 else
4136 sv_setiv((SV*)gv, -1);
3280af22
NIS		 4137 SvREFCNT_dec(PL_compcv);
4138 cv = PL_compcv = NULL;
4139 PL_sub_generation++;
55d729e4
GS		 4140 goto noblock;
4141 }
4142
68dc0745 4143 if (!name || GvCVGEN(gv))
4144 cv = Nullcv;
4145 else if (cv = GvCV(gv)) {
3fe9a6f1 4146 cv_ckproto(cv, gv, ps);
68dc0745 4147 /* already defined (or promised)? */
4148 if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
4149 SV* const_sv;
fe5e78ed 4150 bool const_changed = TRUE;
09bef843 4151 if (!block && !attrs) {
aa689395 4152 /* just a "sub foo;" when &foo is already defined */
3280af22 4153 SAVEFREESV(PL_compcv);
aa689395 4154 goto done;
4155 }
7bac28a0 4156 /* ahem, death to those who redefine active sort subs */
3280af22 4157 if (PL_curstackinfo->si_type == PERLSI_SORT && PL_sortcop == CvSTART(cv))
cea2e8a9 4158 Perl_croak(aTHX_ "Can't redefine active sort subroutine %s", name);
09bef843
SB		 4159 if (!block)
4160 goto withattrs;
fe5e78ed
GS		 4161 if(const_sv = cv_const_sv(cv))
4162 const_changed = sv_cmp(const_sv, op_const_sv(block, Nullcv));
599cee73
PM		 4163 if ((const_sv && const_changed) || ckWARN(WARN_REDEFINE)
4164 && !(CvGV(cv) && GvSTASH(CvGV(cv))
2f34f9d4
IZ		 4165 && HvNAME(GvSTASH(CvGV(cv)))
4166 && strEQ(HvNAME(GvSTASH(CvGV(cv))),
4167 "autouse"))) {
3280af22
NIS		 4168 line_t oldline = PL_curcop->cop_line;
4169 PL_curcop->cop_line = PL_copline;
cea2e8a9 4170 Perl_warner(aTHX_ WARN_REDEFINE,
599cee73 4171 const_sv ? "Constant subroutine %s redefined"
09bef843 4172 : "Subroutine %s redefined", name);
3280af22 4173 PL_curcop->cop_line = oldline;
79072805 4174 }
8990e307 4175 SvREFCNT_dec(cv);
68dc0745 4176 cv = Nullcv;
79072805
LW		 4177 }
4178 }
09bef843
SB		 4179 withattrs:
4180 if (attrs) {
4181 HV *stash;
4182 SV *rcv;
4183
4184 /* Need to do a C<use attributes $stash_of_cv,\&cv,@attrs>
4185 * before we clobber PL_compcv.
4186 */
4187 if (cv && !block) {
4188 rcv = (SV*)cv;
4189 if (CvGV(cv) && GvSTASH(CvGV(cv)) && HvNAME(GvSTASH(CvGV(cv))))
4190 stash = GvSTASH(CvGV(cv));
4191 else if (CvSTASH(cv) && HvNAME(CvSTASH(cv)))
4192 stash = CvSTASH(cv);
4193 else
4194 stash = PL_curstash;
4195 }
4196 else {
4197 /* possibly about to re-define existing subr -- ignore old cv */
4198 rcv = (SV*)PL_compcv;
4199 if (name && GvSTASH(gv) && HvNAME(GvSTASH(gv)))
4200 stash = GvSTASH(gv);
4201 else
4202 stash = PL_curstash;
4203 }
4204 apply_attrs(stash, rcv, attrs);
4205 }
a0d0e21e 4206 if (cv) { /* must reuse cv if autoloaded */
09bef843
SB		 4207 if (!block) {
4208 /* got here with just attrs -- work done, so bug out */
4209 SAVEFREESV(PL_compcv);
4210 goto done;
4211 }
4633a7c4 4212 cv_undef(cv);
3280af22
NIS		 4213 CvFLAGS(cv) = CvFLAGS(PL_compcv);
4214 CvOUTSIDE(cv) = CvOUTSIDE(PL_compcv);
4215 CvOUTSIDE(PL_compcv) = 0;
4216 CvPADLIST(cv) = CvPADLIST(PL_compcv);
4217 CvPADLIST(PL_compcv) = 0;
4218 if (SvREFCNT(PL_compcv) > 1) /* XXX Make closures transit through stub. */
4219 CvOUTSIDE(PL_compcv) = (CV*)SvREFCNT_inc((SV*)cv);
4220 SvREFCNT_dec(PL_compcv);
a0d0e21e
LW		 4221 }
4222 else {
3280af22 4223 cv = PL_compcv;
44a8e56a 4224 if (name) {
4225 GvCV(gv) = cv;
4226 GvCVGEN(gv) = 0;
3280af22 4227 PL_sub_generation++;
44a8e56a 4228 }
a0d0e21e 4229 }
44a8e56a 4230 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
3280af22
NIS		 4231 CvFILEGV(cv) = PL_curcop->cop_filegv;
4232 CvSTASH(cv) = PL_curstash;
11343788
MB		 4233#ifdef USE_THREADS
4234 CvOWNER(cv) = 0;
1cfa4ec7 4235 if (!CvMUTEXP(cv)) {
f6aaf501 4236 New(666, CvMUTEXP(cv), 1, perl_mutex);
1cfa4ec7
GS		 4237 MUTEX_INIT(CvMUTEXP(cv));
4238 }
11343788 4239#endif /* USE_THREADS */
8990e307 4240
3fe9a6f1 4241 if (ps)
4242 sv_setpv((SV*)cv, ps);
4633a7c4 4243
3280af22 4244 if (PL_error_count) {
c07a80fd 4245 op_free(block);
4246 block = Nullop;
68dc0745 4247 if (name) {
4248 char *s = strrchr(name, ':');
4249 s = s ? s+1 : name;
6d4c2119
CS		 4250 if (strEQ(s, "BEGIN")) {
4251 char *not_safe =
4252 "BEGIN not safe after errors--compilation aborted";
faef0170 4253 if (PL_in_eval & EVAL_KEEPERR)
cea2e8a9 4254 Perl_croak(aTHX_ not_safe);
6d4c2119
CS		 4255 else {
4256 /* force display of errors found but not reported */
38a03e6e 4257 sv_catpv(ERRSV, not_safe);
cea2e8a9 4258 Perl_croak(aTHX_ "%s", SvPVx(ERRSV, n_a));
6d4c2119
CS		 4259 }
4260 }
68dc0745 4261 }
c07a80fd 4262 }
a0d0e21e 4263 if (!block) {
55d729e4 4264 noblock:
3280af22 4265 PL_copline = NOLINE;
a0d0e21e
LW		 4266 LEAVE_SCOPE(floor);
4267 return cv;
4268 }
4269
3280af22
NIS		 4270 if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad))
4271 av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv);
a0d0e21e 4272
54310121 4273 if (CvCLONE(cv)) {
3280af22
NIS		 4274 SV **namep = AvARRAY(PL_comppad_name);
4275 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
54310121 4276 SV *namesv;
4277
3280af22 4278 if (SvIMMORTAL(PL_curpad[ix]))
54310121 4279 continue;
4280 /*
4281 * The only things that a clonable function needs in its
4282 * pad are references to outer lexicals and anonymous subs.
4283 * The rest are created anew during cloning.
4284 */
4285 if (!((namesv = namep[ix]) != Nullsv &&
3280af22 4286 namesv != &PL_sv_undef &&
54310121 4287 (SvFAKE(namesv) ||
4288 *SvPVX(namesv) == '&')))
4289 {
3280af22
NIS		 4290 SvREFCNT_dec(PL_curpad[ix]);
4291 PL_curpad[ix] = Nullsv;
54310121 4292 }
4293 }
a0d0e21e 4294 }
54310121 4295 else {
4296 AV *av = newAV(); /* Will be @_ */
4297 av_extend(av, 0);
3280af22 4298 av_store(PL_comppad, 0, (SV*)av);
54310121 4299 AvFLAGS(av) = AVf_REIFY;
79072805 4300
3280af22
NIS		 4301 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
4302 if (SvIMMORTAL(PL_curpad[ix]))
54310121 4303 continue;
3280af22
NIS		 4304 if (!SvPADMY(PL_curpad[ix]))
4305 SvPADTMP_on(PL_curpad[ix]);
54310121 4306 }
4307 }
79072805 4308
cd06dffe
GS		 4309 if(CvLVALUE(cv)) {
4310 CvROOT(cv) = newUNOP(OP_LEAVESUBLV, 0, scalarseq(block));
4311 }
4312 else {
4313 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
4314 }
79072805
LW		 4315 CvSTART(cv) = LINKLIST(CvROOT(cv));
4316 CvROOT(cv)->op_next = 0;
4317 peep(CvSTART(cv));
93a17b20 4318
44a8e56a 4319 if (name) {
4320 char *s;
4321
3280af22 4322 if (PERLDB_SUBLINE && PL_curstash != PL_debstash) {
46fc3d4c 4323 SV *sv = NEWSV(0,0);
44a8e56a 4324 SV *tmpstr = sv_newmortal();
549bb64a 4325 GV *db_postponed = gv_fetchpv("DB::postponed", GV_ADDMULTI, SVt_PVHV);
44a8e56a 4326 CV *cv;
4327 HV *hv;
4328
cea2e8a9 4329 Perl_sv_setpvf(aTHX_ sv, "%_:%ld-%ld",
3280af22
NIS		 4330 GvSV(PL_curcop->cop_filegv),
4331 (long)PL_subline, (long)PL_curcop->cop_line);
44a8e56a 4332 gv_efullname3(tmpstr, gv, Nullch);
3280af22 4333 hv_store(GvHV(PL_DBsub), SvPVX(tmpstr), SvCUR(tmpstr), sv, 0);
44a8e56a 4334 hv = GvHVn(db_postponed);
9607fc9c 4335 if (HvFILL(hv) > 0 && hv_exists(hv, SvPVX(tmpstr), SvCUR(tmpstr))
4336 && (cv = GvCV(db_postponed))) {
44a8e56a 4337 dSP;
924508f0 4338 PUSHMARK(SP);
44a8e56a 4339 XPUSHs(tmpstr);
4340 PUTBACK;
864dbfa3 4341 call_sv((SV*)cv, G_DISCARD);
44a8e56a 4342 }
4343 }
79072805 4344
44a8e56a 4345 if ((s = strrchr(name,':')))
28757baa 4346 s++;
4347 else
4348 s = name;
68dc0745 4349 if (strEQ(s, "BEGIN")) {
3280af22 4350 I32 oldscope = PL_scopestack_ix;
28757baa 4351 ENTER;
3280af22
NIS		 4352 SAVESPTR(PL_compiling.cop_filegv);
4353 SAVEI16(PL_compiling.cop_line);
4354 save_svref(&PL_rs);
4355 sv_setsv(PL_rs, PL_nrs);
28757baa 4356
3280af22
NIS		 4357 if (!PL_beginav)
4358 PL_beginav = newAV();
28757baa 4359 DEBUG_x( dump_sub(gv) );
3280af22 4360 av_push(PL_beginav, (SV *)cv);
28757baa 4361 GvCV(gv) = 0;
3280af22 4362 call_list(oldscope, PL_beginav);
a6006777 4363
3280af22 4364 PL_curcop = &PL_compiling;
a0ed51b3 4365 PL_compiling.op_private = PL_hints;
28757baa 4366 LEAVE;
4367 }
3280af22
NIS		 4368 else if (strEQ(s, "END") && !PL_error_count) {
4369 if (!PL_endav)
4370 PL_endav = newAV();
4371 av_unshift(PL_endav, 1);
4372 av_store(PL_endav, 0, (SV *)cv);
28757baa 4373 GvCV(gv) = 0;
4374 }
3280af22
NIS		 4375 else if (strEQ(s, "INIT") && !PL_error_count) {
4376 if (!PL_initav)
4377 PL_initav = newAV();
4378 av_push(PL_initav, SvREFCNT_inc(cv));
b7aad4fe 4379 GvCV(gv) = 0;
ae77835f 4380 }
79072805 4381 }
a6006777 4382
aa689395 4383 done:
3280af22 4384 PL_copline = NOLINE;
8990e307 4385 LEAVE_SCOPE(floor);
a0d0e21e 4386 return cv;
79072805
LW		 4387}
4388
b099ddc0 4389/* XXX unsafe for threads if eval_owner isn't held */
5476c433 4390void
864dbfa3 4391Perl_newCONSTSUB(pTHX_ HV *stash, char *name, SV *sv)
5476c433
JD		 4392{
4393 dTHR;
3280af22
NIS		 4394 U32 oldhints = PL_hints;
4395 HV *old_cop_stash = PL_curcop->cop_stash;
4396 HV *old_curstash = PL_curstash;
4397 line_t oldline = PL_curcop->cop_line;
4398 PL_curcop->cop_line = PL_copline;
5476c433 4399
3280af22 4400 PL_hints &= ~HINT_BLOCK_SCOPE;
5476c433 4401 if(stash)
3280af22 4402 PL_curstash = PL_curcop->cop_stash = stash;
5476c433 4403
09bef843 4404 newATTRSUB(
be24f278 4405 start_subparse(FALSE, 0),
5476c433 4406 newSVOP(OP_CONST, 0, newSVpv(name,0)),
6b88bc9c 4407 newSVOP(OP_CONST, 0, &PL_sv_no), /* SvPV(&PL_sv_no) == "" -- GMB */
09bef843 4408 Nullop,
5476c433
JD		 4409 newSTATEOP(0, Nullch, newSVOP(OP_CONST, 0, sv))
4410 );
4411
3280af22
NIS		 4412 PL_hints = oldhints;
4413 PL_curcop->cop_stash = old_cop_stash;
4414 PL_curstash = old_curstash;
4415 PL_curcop->cop_line = oldline;
5476c433
JD		 4416}
4417
57d3b86d 4418CV *
864dbfa3 4419Perl_newXS(pTHX_ char *name, XSUBADDR_t subaddr, char *filename)
a0d0e21e 4420{
11343788 4421 dTHR;
44a8e56a 4422 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
79072805 4423 register CV *cv;
44a8e56a 4424
4425 if (cv = (name ? GvCV(gv) : Nullcv)) {
4426 if (GvCVGEN(gv)) {
4427 /* just a cached method */
4428 SvREFCNT_dec(cv);
4429 cv = 0;
4430 }
4431 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
4432 /* already defined (or promised) */
599cee73 4433 if (ckWARN(WARN_REDEFINE) && !(CvGV(cv) && GvSTASH(CvGV(cv))
2f34f9d4
IZ		 4434 && HvNAME(GvSTASH(CvGV(cv)))
4435 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "autouse"))) {
3280af22 4436 line_t oldline = PL_curcop->cop_line;
51f6edd3
GS		 4437 if (PL_copline != NOLINE)
4438 PL_curcop->cop_line = PL_copline;
cea2e8a9 4439 Perl_warner(aTHX_ WARN_REDEFINE, "Subroutine %s redefined",name);
3280af22 4440 PL_curcop->cop_line = oldline;
a0d0e21e
LW		 4441 }
4442 SvREFCNT_dec(cv);
4443 cv = 0;
79072805 4444 }
79072805 4445 }
44a8e56a 4446
4447 if (cv) /* must reuse cv if autoloaded */
4448 cv_undef(cv);
a0d0e21e
LW		 4449 else {
4450 cv = (CV*)NEWSV(1105,0);
4451 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 4452 if (name) {
4453 GvCV(gv) = cv;
4454 GvCVGEN(gv) = 0;
3280af22 4455 PL_sub_generation++;
44a8e56a 4456 }
a0d0e21e 4457 }
5196be3e 4458 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
11343788 4459#ifdef USE_THREADS
12ca11f6 4460 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 4461 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 4462 CvOWNER(cv) = 0;
4463#endif /* USE_THREADS */
79072805 4464 CvFILEGV(cv) = gv_fetchfile(filename);
a0d0e21e 4465 CvXSUB(cv) = subaddr;
44a8e56a 4466
28757baa 4467 if (name) {
4468 char *s = strrchr(name,':');
4469 if (s)
4470 s++;
4471 else
4472 s = name;
4473 if (strEQ(s, "BEGIN")) {
3280af22
NIS		 4474 if (!PL_beginav)
4475 PL_beginav = newAV();
4476 av_push(PL_beginav, (SV *)cv);
44a8e56a 4477 GvCV(gv) = 0;
28757baa 4478 }
4479 else if (strEQ(s, "END")) {
3280af22
NIS		 4480 if (!PL_endav)
4481 PL_endav = newAV();
4482 av_unshift(PL_endav, 1);
4483 av_store(PL_endav, 0, (SV *)cv);
44a8e56a 4484 GvCV(gv) = 0;
28757baa 4485 }
7d07dbc2 4486 else if (strEQ(s, "INIT")) {
3280af22
NIS		 4487 if (!PL_initav)
4488 PL_initav = newAV();
4489 av_push(PL_initav, (SV *)cv);
f8f842e4 4490 GvCV(gv) = 0;
ae77835f 4491 }
28757baa 4492 }
8990e307 4493 else
a5f75d66 4494 CvANON_on(cv);
44a8e56a 4495
a0d0e21e 4496 return cv;
79072805
LW		 4497}
4498
4499void
864dbfa3 4500Perl_newFORM(pTHX_ I32 floor, OP *o, OP *block)
79072805 4501{
11343788 4502 dTHR;
79072805
LW		 4503 register CV *cv;
4504 char *name;
4505 GV *gv;
a0d0e21e 4506 I32 ix;
2d8e6c8d 4507 STRLEN n_a;
79072805 4508
11343788 4509 if (o)
2d8e6c8d 4510 name = SvPVx(cSVOPo->op_sv, n_a);
79072805
LW		 4511 else
4512 name = "STDOUT";
85e6fe83 4513 gv = gv_fetchpv(name,TRUE, SVt_PVFM);
a5f75d66 4514 GvMULTI_on(gv);
79072805 4515 if (cv = GvFORM(gv)) {
599cee73 4516 if (ckWARN(WARN_REDEFINE)) {
3280af22 4517 line_t oldline = PL_curcop->cop_line;
79072805 4518
3280af22 4519 PL_curcop->cop_line = PL_copline;
cea2e8a9 4520 Perl_warner(aTHX_ WARN_REDEFINE, "Format %s redefined",name);
3280af22 4521 PL_curcop->cop_line = oldline;
79072805 4522 }
8990e307 4523 SvREFCNT_dec(cv);
79072805 4524 }
3280af22 4525 cv = PL_compcv;
79072805 4526 GvFORM(gv) = cv;
44a8e56a 4527 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
3280af22 4528 CvFILEGV(cv) = PL_curcop->cop_filegv;
79072805 4529
3280af22
NIS		 4530 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
4531 if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix]))
4532 SvPADTMP_on(PL_curpad[ix]);
a0d0e21e
LW		 4533 }
4534
79072805
LW		 4535 CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
4536 CvSTART(cv) = LINKLIST(CvROOT(cv));
4537 CvROOT(cv)->op_next = 0;
4538 peep(CvSTART(cv));
11343788 4539 op_free(o);
3280af22 4540 PL_copline = NOLINE;
8990e307 4541 LEAVE_SCOPE(floor);
79072805
LW		 4542}
4543
4544OP *
864dbfa3 4545Perl_newANONLIST(pTHX_ OP *o)
79072805 4546{
93a17b20 4547 return newUNOP(OP_REFGEN, 0,
11343788 4548 mod(list(convert(OP_ANONLIST, 0, o)), OP_REFGEN));
79072805
LW		 4549}
4550
4551OP *
864dbfa3 4552Perl_newANONHASH(pTHX_ OP *o)
79072805 4553{
93a17b20 4554 return newUNOP(OP_REFGEN, 0,
11343788 4555 mod(list(convert(OP_ANONHASH, 0, o)), OP_REFGEN));
a0d0e21e
LW		 4556}
4557
4558OP *
864dbfa3 4559Perl_newANONSUB(pTHX_ I32 floor, OP *proto, OP *block)
a0d0e21e 4560{
09bef843
SB		 4561 return newANONATTRSUB(floor, proto, Nullop, block);
4562}
4563
4564OP *
4565Perl_newANONATTRSUB(pTHX_ I32 floor, OP *proto, OP *attrs, OP *block)
4566{
a0d0e21e 4567 return newUNOP(OP_REFGEN, 0,
09bef843
SB		 4568 newSVOP(OP_ANONCODE, 0,
4569 (SV*)newATTRSUB(floor, 0, proto, attrs, block)));
79072805
LW		 4570}
4571
4572OP *
864dbfa3 4573Perl_oopsAV(pTHX_ OP *o)
79072805 4574{
ed6116ce
LW		 4575 switch (o->op_type) {
4576 case OP_PADSV:
4577 o->op_type = OP_PADAV;
22c35a8c 4578 o->op_ppaddr = PL_ppaddr[OP_PADAV];
51e247a3 4579 return ref(o, OP_RV2AV);
ed6116ce
LW		 4580
4581 case OP_RV2SV:
79072805 4582 o->op_type = OP_RV2AV;
22c35a8c 4583 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
79072805 4584 ref(o, OP_RV2AV);
ed6116ce
LW		 4585 break;
4586
4587 default:
0453d815
PM		 4588 if (ckWARN_d(WARN_INTERNAL))
4589 Perl_warner(aTHX_ WARN_INTERNAL, "oops: oopsAV");
ed6116ce
LW		 4590 break;
4591 }
79072805
LW		 4592 return o;
4593}
4594
4595OP *
864dbfa3 4596Perl_oopsHV(pTHX_ OP *o)
79072805 4597{
0453d815 4598 dTHR;
0453d815 4599
ed6116ce
LW		 4600 switch (o->op_type) {
4601 case OP_PADSV:
4602 case OP_PADAV:
4603 o->op_type = OP_PADHV;
22c35a8c 4604 o->op_ppaddr = PL_ppaddr[OP_PADHV];
51e247a3 4605 return ref(o, OP_RV2HV);
ed6116ce
LW		 4606
4607 case OP_RV2SV:
4608 case OP_RV2AV:
79072805 4609 o->op_type = OP_RV2HV;
22c35a8c 4610 o->op_ppaddr = PL_ppaddr[OP_RV2HV];
79072805 4611 ref(o, OP_RV2HV);
ed6116ce
LW		 4612 break;
4613
4614 default:
0453d815
PM		 4615 if (ckWARN_d(WARN_INTERNAL))
4616 Perl_warner(aTHX_ WARN_INTERNAL, "oops: oopsHV");
ed6116ce
LW		 4617 break;
4618 }
79072805
LW		 4619 return o;
4620}
4621
4622OP *
864dbfa3 4623Perl_newAVREF(pTHX_ OP *o)
79072805 4624{
ed6116ce
LW		 4625 if (o->op_type == OP_PADANY) {
4626 o->op_type = OP_PADAV;
22c35a8c 4627 o->op_ppaddr = PL_ppaddr[OP_PADAV];
93a17b20 4628 return o;
ed6116ce 4629 }
79072805
LW		 4630 return newUNOP(OP_RV2AV, 0, scalar(o));
4631}
4632
4633OP *
864dbfa3 4634Perl_newGVREF(pTHX_ I32 type, OP *o)
79072805 4635{
82092f1d 4636 if (type == OP_MAPSTART || type == OP_GREPSTART || type == OP_SORT)
a0d0e21e 4637 return newUNOP(OP_NULL, 0, o);
748a9306 4638 return ref(newUNOP(OP_RV2GV, OPf_REF, o), type);
79072805
LW		 4639}
4640
4641OP *
864dbfa3 4642Perl_newHVREF(pTHX_ OP *o)
79072805 4643{
ed6116ce
LW		 4644 if (o->op_type == OP_PADANY) {
4645 o->op_type = OP_PADHV;
22c35a8c 4646 o->op_ppaddr = PL_ppaddr[OP_PADHV];
93a17b20 4647 return o;
ed6116ce 4648 }
79072805
LW		 4649 return newUNOP(OP_RV2HV, 0, scalar(o));
4650}
4651
4652OP *
864dbfa3 4653Perl_oopsCV(pTHX_ OP *o)
79072805 4654{
cea2e8a9 4655 Perl_croak(aTHX_ "NOT IMPL LINE %d",__LINE__);
79072805
LW		 4656 /* STUB */
4657 return o;
4658}
4659
4660OP *
864dbfa3 4661Perl_newCVREF(pTHX_ I32 flags, OP *o)
79072805 4662{
c07a80fd 4663 return newUNOP(OP_RV2CV, flags, scalar(o));
79072805
LW		 4664}
4665
4666OP *
864dbfa3 4667Perl_newSVREF(pTHX_ OP *o)
79072805 4668{
ed6116ce
LW		 4669 if (o->op_type == OP_PADANY) {
4670 o->op_type = OP_PADSV;
22c35a8c 4671 o->op_ppaddr = PL_ppaddr[OP_PADSV];
93a17b20 4672 return o;
ed6116ce 4673 }
224a4551
MB		 4674 else if (o->op_type == OP_THREADSV && !(o->op_flags & OPpDONE_SVREF)) {
4675 o->op_flags |= OPpDONE_SVREF;
a863c7d1 4676 return o;
224a4551 4677 }
79072805
LW		 4678 return newUNOP(OP_RV2SV, 0, scalar(o));
4679}
4680
4681/* Check routines. */
4682
4683OP *
cea2e8a9 4684Perl_ck_anoncode(pTHX_ OP *o)
5f05dabc 4685{
178c6305
CS		 4686 PADOFFSET ix;
4687 SV* name;
4688
4689 name = NEWSV(1106,0);
4690 sv_upgrade(name, SVt_PVNV);
4691 sv_setpvn(name, "&", 1);
4692 SvIVX(name) = -1;
4693 SvNVX(name) = 1;
5dc0d613 4694 ix = pad_alloc(o->op_type, SVs_PADMY);
3280af22
NIS		 4695 av_store(PL_comppad_name, ix, name);
4696 av_store(PL_comppad, ix, cSVOPo->op_sv);
5dc0d613
MB		 4697 SvPADMY_on(cSVOPo->op_sv);
4698 cSVOPo->op_sv = Nullsv;
4699 cSVOPo->op_targ = ix;
4700 return o;
5f05dabc 4701}
4702
4703OP *
cea2e8a9 4704Perl_ck_bitop(pTHX_ OP *o)
55497cff 4705{
3280af22 4706 o->op_private = PL_hints;
5dc0d613 4707 return o;
55497cff 4708}
4709
4710OP *
cea2e8a9 4711Perl_ck_concat(pTHX_ OP *o)
79072805 4712{
11343788
MB		 4713 if (cUNOPo->op_first->op_type == OP_CONCAT)
4714 o->op_flags |= OPf_STACKED;
4715 return o;
79072805
LW		 4716}
4717
4718OP *
cea2e8a9 4719Perl_ck_spair(pTHX_ OP *o)
79072805 4720{
11343788 4721 if (o->op_flags & OPf_KIDS) {
79072805 4722 OP* newop;
a0d0e21e 4723 OP* kid;
5dc0d613
MB		 4724 OPCODE type = o->op_type;
4725 o = modkids(ck_fun(o), type);
11343788 4726 kid = cUNOPo->op_first;
a0d0e21e
LW		 4727 newop = kUNOP->op_first->op_sibling;
4728 if (newop &&
4729 (newop->op_sibling ||
22c35a8c 4730 !(PL_opargs[newop->op_type] & OA_RETSCALAR) ||
a0d0e21e
LW		 4731 newop->op_type == OP_PADAV || newop->op_type == OP_PADHV ||
4732 newop->op_type == OP_RV2AV || newop->op_type == OP_RV2HV)) {
aeea060c 4733
11343788 4734 return o;
a0d0e21e
LW		 4735 }
4736 op_free(kUNOP->op_first);
4737 kUNOP->op_first = newop;
4738 }
22c35a8c 4739 o->op_ppaddr = PL_ppaddr[++o->op_type];
11343788 4740 return ck_fun(o);
a0d0e21e
LW		 4741}
4742
4743OP *
cea2e8a9 4744Perl_ck_delete(pTHX_ OP *o)
a0d0e21e 4745{
11343788 4746 o = ck_fun(o);
5dc0d613 4747 o->op_private = 0;
11343788
MB		 4748 if (o->op_flags & OPf_KIDS) {
4749 OP *kid = cUNOPo->op_first;
5f05dabc 4750 if (kid->op_type == OP_HSLICE)
5dc0d613 4751 o->op_private |= OPpSLICE;
5f05dabc 4752 else if (kid->op_type != OP_HELEM)
cea2e8a9 4753 Perl_croak(aTHX_ "%s argument is not a HASH element or slice",
22c35a8c 4754 PL_op_desc[o->op_type]);
a0d0e21e 4755 null(kid);
79072805 4756 }
11343788 4757 return o;
79072805
LW		 4758}
4759
4760OP *
cea2e8a9 4761Perl_ck_eof(pTHX_ OP *o)
79072805 4762{
11343788 4763 I32 type = o->op_type;
79072805 4764
11343788
MB		 4765 if (o->op_flags & OPf_KIDS) {
4766 if (cLISTOPo->op_first->op_type == OP_STUB) {
4767 op_free(o);
4768 o = newUNOP(type, OPf_SPECIAL,
d58bf5aa 4769 newGVOP(OP_GV, 0, gv_fetchpv("main::ARGV", TRUE, SVt_PVAV)));
8990e307 4770 }
11343788 4771 return ck_fun(o);
79072805 4772 }
11343788 4773 return o;
79072805
LW		 4774}
4775
4776OP *
cea2e8a9 4777Perl_ck_eval(pTHX_ OP *o)
79072805 4778{
3280af22 4779 PL_hints |= HINT_BLOCK_SCOPE;
11343788
MB		 4780 if (o->op_flags & OPf_KIDS) {
4781 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 4782
93a17b20 4783 if (!kid) {
11343788
MB		 4784 o->op_flags &= ~OPf_KIDS;
4785 null(o);
79072805
LW		 4786 }
4787 else if (kid->op_type == OP_LINESEQ) {
4788 LOGOP *enter;
4789
11343788
MB		 4790 kid->op_next = o->op_next;
4791 cUNOPo->op_first = 0;
4792 op_free(o);
79072805 4793
b7dc083c 4794 NewOp(1101, enter, 1, LOGOP);
79072805 4795 enter->op_type = OP_ENTERTRY;
22c35a8c 4796 enter->op_ppaddr = PL_ppaddr[OP_ENTERTRY];
79072805
LW		 4797 enter->op_private = 0;
4798
4799 /* establish postfix order */
4800 enter->op_next = (OP*)enter;
4801
11343788
MB		 4802 o = prepend_elem(OP_LINESEQ, (OP*)enter, (OP*)kid);
4803 o->op_type = OP_LEAVETRY;
22c35a8c 4804 o->op_ppaddr = PL_ppaddr[OP_LEAVETRY];
11343788
MB		 4805 enter->op_other = o;
4806 return o;
79072805 4807 }
c7cc6f1c 4808 else
473986ff 4809 scalar((OP*)kid);
79072805
LW		 4810 }
4811 else {
11343788 4812 op_free(o);
54b9620d 4813 o = newUNOP(OP_ENTEREVAL, 0, newDEFSVOP());
79072805 4814 }
3280af22 4815 o->op_targ = (PADOFFSET)PL_hints;
11343788 4816 return o;
79072805
LW		 4817}
4818
4819OP *
cea2e8a9 4820Perl_ck_exec(pTHX_ OP *o)
79072805
LW		 4821{
4822 OP *kid;
11343788
MB		 4823 if (o->op_flags & OPf_STACKED) {
4824 o = ck_fun(o);
4825 kid = cUNOPo->op_first->op_sibling;
8990e307
LW		 4826 if (kid->op_type == OP_RV2GV)
4827 null(kid);
79072805 4828 }
463ee0b2 4829 else
11343788
MB		 4830 o = listkids(o);
4831 return o;
79072805
LW		 4832}
4833
4834OP *
cea2e8a9 4835Perl_ck_exists(pTHX_ OP *o)
5f05dabc 4836{
5196be3e
MB		 4837 o = ck_fun(o);
4838 if (o->op_flags & OPf_KIDS) {
4839 OP *kid = cUNOPo->op_first;
5f05dabc 4840 if (kid->op_type != OP_HELEM)
cea2e8a9 4841 Perl_croak(aTHX_ "%s argument is not a HASH element", PL_op_desc[o->op_type]);
5f05dabc 4842 null(kid);
4843 }
5196be3e 4844 return o;
5f05dabc 4845}
4846
22c35a8c 4847#if 0
5f05dabc 4848OP *
cea2e8a9 4849Perl_ck_gvconst(pTHX_ register OP *o)
79072805
LW		 4850{
4851 o = fold_constants(o);
4852 if (o->op_type == OP_CONST)
4853 o->op_type = OP_GV;
4854 return o;
4855}
22c35a8c 4856#endif
79072805
LW		 4857
4858OP *
cea2e8a9 4859Perl_ck_rvconst(pTHX_ register OP *o)
79072805 4860{
11343788
MB		 4861 dTHR;
4862 SVOP *kid = (SVOP*)cUNOPo->op_first;
85e6fe83 4863
3280af22 4864 o->op_private |= (PL_hints & HINT_STRICT_REFS);
79072805 4865 if (kid->op_type == OP_CONST) {
44a8e56a 4866 char *name;
4867 int iscv;
4868 GV *gv;
779c5bc9 4869 SV *kidsv = kid->op_sv;
2d8e6c8d 4870 STRLEN n_a;
44a8e56a 4871
779c5bc9
GS		 4872 /* Is it a constant from cv_const_sv()? */
4873 if (SvROK(kidsv) && SvREADONLY(kidsv)) {
4874 SV *rsv = SvRV(kidsv);
4875 int svtype = SvTYPE(rsv);
4876 char *badtype = Nullch;
4877
4878 switch (o->op_type) {
4879 case OP_RV2SV:
4880 if (svtype > SVt_PVMG)
4881 badtype = "a SCALAR";
4882 break;
4883 case OP_RV2AV:
4884 if (svtype != SVt_PVAV)
4885 badtype = "an ARRAY";
4886 break;
4887 case OP_RV2HV:
4888 if (svtype != SVt_PVHV) {
4889 if (svtype == SVt_PVAV) { /* pseudohash? */
4890 SV **ksv = av_fetch((AV*)rsv, 0, FALSE);
4891 if (ksv && SvROK(*ksv)
4892 && SvTYPE(SvRV(*ksv)) == SVt_PVHV)
4893 {
4894 break;
4895 }
4896 }
4897 badtype = "a HASH";
4898 }
4899 break;
4900 case OP_RV2CV:
4901 if (svtype != SVt_PVCV)
4902 badtype = "a CODE";
4903 break;
4904 }
4905 if (badtype)
cea2e8a9 4906 Perl_croak(aTHX_ "Constant is not %s reference", badtype);
779c5bc9
GS		 4907 return o;
4908 }
2d8e6c8d 4909 name = SvPV(kidsv, n_a);
3280af22 4910 if ((PL_hints & HINT_STRICT_REFS) && (kid->op_private & OPpCONST_BARE)) {
44a8e56a 4911 char *badthing = Nullch;
5dc0d613 4912 switch (o->op_type) {
44a8e56a 4913 case OP_RV2SV:
4914 badthing = "a SCALAR";
4915 break;
4916 case OP_RV2AV:
4917 badthing = "an ARRAY";
4918 break;
4919 case OP_RV2HV:
4920 badthing = "a HASH";
4921 break;
4922 }
4923 if (badthing)
cea2e8a9 4924 Perl_croak(aTHX_
44a8e56a 4925 "Can't use bareword (\"%s\") as %s ref while \"strict refs\" in use",
4926 name, badthing);
4927 }
93233ece
CS		 4928 /*
4929 * This is a little tricky. We only want to add the symbol if we
4930 * didn't add it in the lexer. Otherwise we get duplicate strict
4931 * warnings. But if we didn't add it in the lexer, we must at
4932 * least pretend like we wanted to add it even if it existed before,
4933 * or we get possible typo warnings. OPpCONST_ENTERED says
4934 * whether the lexer already added THIS instance of this symbol.
4935 */
5196be3e 4936 iscv = (o->op_type == OP_RV2CV) * 2;
93233ece 4937 do {
44a8e56a 4938 gv = gv_fetchpv(name,
748a9306 4939 iscv | !(kid->op_private & OPpCONST_ENTERED),
a0d0e21e
LW		 4940 iscv
4941 ? SVt_PVCV
11343788 4942 : o->op_type == OP_RV2SV
a0d0e21e 4943 ? SVt_PV
11343788 4944 : o->op_type == OP_RV2AV
a0d0e21e 4945 ? SVt_PVAV
11343788 4946 : o->op_type == OP_RV2HV
a0d0e21e
LW		 4947 ? SVt_PVHV
4948 : SVt_PVGV);
93233ece
CS		 4949 } while (!gv && !(kid->op_private & OPpCONST_ENTERED) && !iscv++);
4950 if (gv) {
4951 kid->op_type = OP_GV;
4952 SvREFCNT_dec(kid->op_sv);
4953 kid->op_sv = SvREFCNT_inc(gv);
76cd736e 4954 kid->op_ppaddr = PL_ppaddr[OP_GV];
a0d0e21e 4955 }
79072805 4956 }
11343788 4957 return o;
79072805
LW		 4958}
4959
4960OP *
cea2e8a9 4961Perl_ck_ftst(pTHX_ OP *o)
79072805 4962{
11343788
MB		 4963 dTHR;
4964 I32 type = o->op_type;
79072805 4965
11343788
MB		 4966 if (o->op_flags & OPf_REF)
4967 return o;
79072805 4968
108ed793 4969 if (o->op_flags & OPf_KIDS && cUNOPo->op_first->op_type != OP_STUB) {
11343788 4970 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805
LW		 4971
4972 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
2d8e6c8d 4973 STRLEN n_a;
a0d0e21e 4974 OP *newop = newGVOP(type, OPf_REF,
2d8e6c8d 4975 gv_fetchpv(SvPVx(kid->op_sv, n_a), TRUE, SVt_PVIO));
11343788 4976 op_free(o);
79072805
LW		 4977 return newop;
4978 }
4979 }
4980 else {
11343788 4981 op_free(o);
79072805 4982 if (type == OP_FTTTY)
fb73857a 4983 return newGVOP(type, OPf_REF, gv_fetchpv("main::STDIN", TRUE,
85e6fe83 4984 SVt_PVIO));
79072805 4985 else
54b9620d 4986 return newUNOP(type, 0, newDEFSVOP());
79072805 4987 }
11343788 4988 return o;
79072805
LW		 4989}
4990
4991OP *
cea2e8a9 4992Perl_ck_fun(pTHX_ OP *o)
79072805 4993{
11343788 4994 dTHR;
79072805
LW		 4995 register OP *kid;
4996 OP **tokid;
4997 OP *sibl;
4998 I32 numargs = 0;
11343788 4999 int type = o->op_type;
22c35a8c 5000 register I32 oa = PL_opargs[type] >> OASHIFT;
aeea060c 5001
11343788 5002 if (o->op_flags & OPf_STACKED) {
79072805
LW		 5003 if ((oa & OA_OPTIONAL) && (oa >> 4) && !((oa >> 4) & OA_OPTIONAL))
5004 oa &= ~OA_OPTIONAL;
5005 else
11343788 5006 return no_fh_allowed(o);
79072805
LW		 5007 }
5008
11343788 5009 if (o->op_flags & OPf_KIDS) {
2d8e6c8d 5010 STRLEN n_a;
11343788
MB		 5011 tokid = &cLISTOPo->op_first;
5012 kid = cLISTOPo->op_first;
8990e307
LW		 5013 if (kid->op_type == OP_PUSHMARK ||
5014 kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK)
5015 {
79072805
LW		 5016 tokid = &kid->op_sibling;
5017 kid = kid->op_sibling;
5018 }
22c35a8c 5019 if (!kid && PL_opargs[type] & OA_DEFGV)
54b9620d 5020 *tokid = kid = newDEFSVOP();
79072805
LW		 5021
5022 while (oa && kid) {
5023 numargs++;
5024 sibl = kid->op_sibling;
5025 switch (oa & 7) {
5026 case OA_SCALAR:
62c18ce2
GS		 5027 /* list seen where single (scalar) arg expected? */
5028 if (numargs == 1 && !(oa >> 4)
5029 && kid->op_type == OP_LIST && type != OP_SCALAR)
5030 {
5031 return too_many_arguments(o,PL_op_desc[type]);
5032 }
79072805
LW		 5033 scalar(kid);
5034 break;
5035 case OA_LIST:
5036 if (oa < 16) {
5037 kid = 0;
5038 continue;
5039 }
5040 else
5041 list(kid);
5042 break;
5043 case OA_AVREF:
5044 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5045 (kid->op_private & OPpCONST_BARE))
5046 {
2d8e6c8d 5047 char *name = SvPVx(((SVOP*)kid)->op_sv, n_a);
79072805 5048 OP *newop = newAVREF(newGVOP(OP_GV, 0,
85e6fe83 5049 gv_fetchpv(name, TRUE, SVt_PVAV) ));
b9c39e73 5050 if (ckWARN(WARN_SYNTAX))
cf2093f6 5051 Perl_warner(aTHX_ WARN_SYNTAX,
57def98f 5052 "Array @%s missing the @ in argument %"IVdf" of %s()",
cf2093f6 5053 name, (IV)numargs, PL_op_desc[type]);
79072805
LW		 5054 op_free(kid);
5055 kid = newop;
5056 kid->op_sibling = sibl;
5057 *tokid = kid;
5058 }
8990e307 5059 else if (kid->op_type != OP_RV2AV && kid->op_type != OP_PADAV)
35cd451c 5060 bad_type(numargs, "array", PL_op_desc[type], kid);
a0d0e21e 5061 mod(kid, type);
79072805
LW		 5062 break;
5063 case OA_HVREF:
5064 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5065 (kid->op_private & OPpCONST_BARE))
5066 {
2d8e6c8d 5067 char *name = SvPVx(((SVOP*)kid)->op_sv, n_a);
79072805 5068 OP *newop = newHVREF(newGVOP(OP_GV, 0,
85e6fe83 5069 gv_fetchpv(name, TRUE, SVt_PVHV) ));
b9c39e73 5070 if (ckWARN(WARN_SYNTAX))
cf2093f6 5071 Perl_warner(aTHX_ WARN_SYNTAX,
57def98f 5072 "Hash %%%s missing the %% in argument %"IVdf" of %s()",
cf2093f6 5073 name, (IV)numargs, PL_op_desc[type]);
79072805
LW		 5074 op_free(kid);
5075 kid = newop;
5076 kid->op_sibling = sibl;
5077 *tokid = kid;
5078 }
8990e307 5079 else if (kid->op_type != OP_RV2HV && kid->op_type != OP_PADHV)
35cd451c 5080 bad_type(numargs, "hash", PL_op_desc[type], kid);
a0d0e21e 5081 mod(kid, type);
79072805
LW		 5082 break;
5083 case OA_CVREF:
5084 {
a0d0e21e 5085 OP *newop = newUNOP(OP_NULL, 0, kid);
79072805
LW		 5086 kid->op_sibling = 0;
5087 linklist(kid);
5088 newop->op_next = newop;
5089 kid = newop;
5090 kid->op_sibling = sibl;
5091 *tokid = kid;
5092 }
5093 break;
5094 case OA_FILEREF:
c340be78 5095 if (kid->op_type != OP_GV && kid->op_type != OP_RV2GV) {
79072805 5096 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5097 (kid->op_private & OPpCONST_BARE))
5098 {
79072805 5099 OP *newop = newGVOP(OP_GV, 0,
2d8e6c8d 5100 gv_fetchpv(SvPVx(((SVOP*)kid)->op_sv, n_a), TRUE,
85e6fe83 5101 SVt_PVIO) );
79072805
LW		 5102 op_free(kid);
5103 kid = newop;
5104 }
1ea32a52
GS		 5105 else if (kid->op_type == OP_READLINE) {
5106 /* neophyte patrol: open(<FH>), close(<FH>) etc. */
5107 bad_type(numargs, "HANDLE", PL_op_desc[o->op_type], kid);
5108 }
79072805 5109 else {
35cd451c 5110 I32 flags = OPf_SPECIAL;
a6c40364 5111 I32 priv = 0;
35cd451c 5112 /* is this op a FH constructor? */
853846ea 5113 if (is_handle_constructor(o,numargs)) {
1d8d4d2a 5114 flags = 0;
853846ea
NIS		 5115 /* Set a flag to tell rv2gv to vivify
5116 * need to "prove" flag does not mean something
5117 * else already - NI-S 1999/05/07
5118 */
a6c40364 5119 priv = OPpDEREF;
1d8d4d2a
NIS		 5120#if 0
5121 /* Helps with open($array[$n],...)
5122 but is too simplistic - need to do selectively
5123 */
5124 mod(kid,type);
5125#endif
853846ea 5126 }
79072805 5127 kid->op_sibling = 0;
35cd451c 5128 kid = newUNOP(OP_RV2GV, flags, scalar(kid));
a6c40364
GS		 5129 if (priv) {
5130 kid->op_private |= priv;
1d8d4d2a 5131 }
79072805
LW		 5132 }
5133 kid->op_sibling = sibl;
5134 *tokid = kid;
5135 }
5136 scalar(kid);
5137 break;
5138 case OA_SCALARREF:
a0d0e21e 5139 mod(scalar(kid), type);
79072805
LW		 5140 break;
5141 }
5142 oa >>= 4;
5143 tokid = &kid->op_sibling;
5144 kid = kid->op_sibling;
5145 }
11343788 5146 o->op_private |= numargs;
79072805 5147 if (kid)
22c35a8c 5148 return too_many_arguments(o,PL_op_desc[o->op_type]);
11343788 5149 listkids(o);
79072805 5150 }
22c35a8c 5151 else if (PL_opargs[type] & OA_DEFGV) {
11343788 5152 op_free(o);
54b9620d 5153 return newUNOP(type, 0, newDEFSVOP());
a0d0e21e
LW		 5154 }
5155
79072805
LW		 5156 if (oa) {
5157 while (oa & OA_OPTIONAL)
5158 oa >>= 4;
5159 if (oa && oa != OA_LIST)
22c35a8c 5160 return too_few_arguments(o,PL_op_desc[o->op_type]);
79072805 5161 }
11343788 5162 return o;
79072805
LW		 5163}
5164
5165OP *
cea2e8a9 5166Perl_ck_glob(pTHX_ OP *o)
79072805 5167{
fb73857a 5168 GV *gv;
5169
1f2bfc8a 5170 if ((o->op_flags & OPf_KIDS) && !cLISTOPo->op_first->op_sibling)
54b9620d 5171 append_elem(OP_GLOB, o, newDEFSVOP());
fb73857a 5172
5173 if (!((gv = gv_fetchpv("glob", FALSE, SVt_PVCV)) && GvIMPORTED_CV(gv)))
5174 gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
b1cb66bf 5175
5176 if (gv && GvIMPORTED_CV(gv)) {
5196be3e 5177 append_elem(OP_GLOB, o,
80252599 5178 newSVOP(OP_CONST, 0, newSViv(PL_glob_index++)));
1f2bfc8a 5179 o->op_type = OP_LIST;
22c35a8c 5180 o->op_ppaddr = PL_ppaddr[OP_LIST];
1f2bfc8a 5181 cLISTOPo->op_first->op_type = OP_PUSHMARK;
22c35a8c 5182 cLISTOPo->op_first->op_ppaddr = PL_ppaddr[OP_PUSHMARK];
1f2bfc8a 5183 o = newUNOP(OP_ENTERSUB, OPf_STACKED,
aeea060c 5184 append_elem(OP_LIST, o,
1f2bfc8a
MB		 5185 scalar(newUNOP(OP_RV2CV, 0,
5186 newGVOP(OP_GV, 0, gv)))));
d58bf5aa
MB		 5187 o = newUNOP(OP_NULL, 0, ck_subr(o));
5188 o->op_targ = OP_GLOB; /* hint at what it used to be */
5189 return o;
b1cb66bf 5190 }
5191 gv = newGVgen("main");
a0d0e21e 5192 gv_IOadd(gv);
11343788
MB		 5193 append_elem(OP_GLOB, o, newGVOP(OP_GV, 0, gv));
5194 scalarkids(o);
5195 return ck_fun(o);
79072805
LW		 5196}
5197
5198OP *
cea2e8a9 5199Perl_ck_grep(pTHX_ OP *o)
79072805
LW		 5200{
5201 LOGOP *gwop;
5202 OP *kid;
11343788 5203 OPCODE type = o->op_type == OP_GREPSTART ? OP_GREPWHILE : OP_MAPWHILE;
79072805 5204
22c35a8c 5205 o->op_ppaddr = PL_ppaddr[OP_GREPSTART];
b7dc083c 5206 NewOp(1101, gwop, 1, LOGOP);
aeea060c 5207
11343788 5208 if (o->op_flags & OPf_STACKED) {
a0d0e21e 5209 OP* k;
11343788
MB		 5210 o = ck_sort(o);
5211 kid = cLISTOPo->op_first->op_sibling;
5212 for (k = cLISTOPo->op_first->op_sibling->op_next; k; k = k->op_next) {
a0d0e21e
LW		 5213 kid = k;
5214 }
5215 kid->op_next = (OP*)gwop;
11343788 5216 o->op_flags &= ~OPf_STACKED;
93a17b20 5217 }
11343788 5218 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e
LW		 5219 if (type == OP_MAPWHILE)
5220 list(kid);
5221 else
5222 scalar(kid);
11343788 5223 o = ck_fun(o);
3280af22 5224 if (PL_error_count)
11343788 5225 return o;
aeea060c 5226 kid = cLISTOPo->op_first->op_sibling;
79072805 5227 if (kid->op_type != OP_NULL)
cea2e8a9 5228 Perl_croak(aTHX_ "panic: ck_grep");
79072805
LW		 5229 kid = kUNOP->op_first;
5230
a0d0e21e 5231 gwop->op_type = type;
22c35a8c 5232 gwop->op_ppaddr = PL_ppaddr[type];
11343788 5233 gwop->op_first = listkids(o);
79072805
LW		 5234 gwop->op_flags |= OPf_KIDS;
5235 gwop->op_private = 1;
5236 gwop->op_other = LINKLIST(kid);
a0d0e21e 5237 gwop->op_targ = pad_alloc(type, SVs_PADTMP);
79072805
LW		 5238 kid->op_next = (OP*)gwop;
5239
11343788 5240 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e 5241 if (!kid || !kid->op_sibling)
22c35a8c 5242 return too_few_arguments(o,PL_op_desc[o->op_type]);
a0d0e21e
LW		 5243 for (kid = kid->op_sibling; kid; kid = kid->op_sibling)
5244 mod(kid, OP_GREPSTART);
5245
79072805
LW		 5246 return (OP*)gwop;
5247}
5248
5249OP *
cea2e8a9 5250Perl_ck_index(pTHX_ OP *o)
79072805 5251{
11343788
MB		 5252 if (o->op_flags & OPf_KIDS) {
5253 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
0b71040e
LW		 5254 if (kid)
5255 kid = kid->op_sibling; /* get past "big" */
79072805 5256 if (kid && kid->op_type == OP_CONST)
2779dcf1 5257 fbm_compile(((SVOP*)kid)->op_sv, 0);
79072805 5258 }
11343788 5259 return ck_fun(o);
79072805
LW		 5260}
5261
5262OP *
cea2e8a9 5263Perl_ck_lengthconst(pTHX_ OP *o)
79072805
LW		 5264{
5265 /* XXX length optimization goes here */
11343788 5266 return ck_fun(o);
79072805
LW		 5267}
5268
5269OP *
cea2e8a9 5270Perl_ck_lfun(pTHX_ OP *o)
79072805 5271{
5dc0d613
MB		 5272 OPCODE type = o->op_type;
5273 return modkids(ck_fun(o), type);
79072805
LW		 5274}
5275
5276OP *
cea2e8a9 5277Perl_ck_defined(pTHX_ OP *o) /* 19990527 MJD */
69794302 5278{
20ce7b12 5279 dTHR;
d0334bed
GS		 5280 if ((o->op_flags & OPf_KIDS) && ckWARN(WARN_DEPRECATED)) {
5281 switch (cUNOPo->op_first->op_type) {
5282 case OP_RV2AV:
7e291ef1 5283 break; /* Globals via GV can be undef */
d0334bed
GS		 5284 case OP_PADAV:
5285 case OP_AASSIGN: /* Is this a good idea? */
5286 Perl_warner(aTHX_ WARN_DEPRECATED,
f10b0346 5287 "defined(@array) is deprecated");
d0334bed
GS		 5288 Perl_warner(aTHX_ WARN_DEPRECATED,
5289 "(Maybe you should just omit the defined()?)\n");
69794302 5290 break;
d0334bed 5291 case OP_RV2HV:
7e291ef1 5292 break; /* Globals via GV can be undef */
d0334bed
GS		 5293 case OP_PADHV:
5294 Perl_warner(aTHX_ WARN_DEPRECATED,
f10b0346 5295 "defined(%hash) is deprecated");
d0334bed
GS		 5296 Perl_warner(aTHX_ WARN_DEPRECATED,
5297 "(Maybe you should just omit the defined()?)\n");
5298 break;
5299 default:
5300 /* no warning */
5301 break;
5302 }
69794302
MJD		 5303 }
5304 return ck_rfun(o);
5305}
5306
5307OP *
cea2e8a9 5308Perl_ck_rfun(pTHX_ OP *o)
8990e307 5309{
5dc0d613
MB		 5310 OPCODE type = o->op_type;
5311 return refkids(ck_fun(o), type);
8990e307
LW		 5312}
5313
5314OP *
cea2e8a9 5315Perl_ck_listiob(pTHX_ OP *o)
79072805
LW		 5316{
5317 register OP *kid;
aeea060c 5318
11343788 5319 kid = cLISTOPo->op_first;
79072805 5320 if (!kid) {
11343788
MB		 5321 o = force_list(o);
5322 kid = cLISTOPo->op_first;
79072805
LW		 5323 }
5324 if (kid->op_type == OP_PUSHMARK)
5325 kid = kid->op_sibling;
11343788 5326 if (kid && o->op_flags & OPf_STACKED)
79072805
LW		 5327 kid = kid->op_sibling;
5328 else if (kid && !kid->op_sibling) { /* print HANDLE; */
5329 if (kid->op_type == OP_CONST && kid->op_private & OPpCONST_BARE) {
11343788 5330 o->op_flags |= OPf_STACKED; /* make it a filehandle */
748a9306 5331 kid = newUNOP(OP_RV2GV, OPf_REF, scalar(kid));
11343788
MB		 5332 cLISTOPo->op_first->op_sibling = kid;
5333 cLISTOPo->op_last = kid;
79072805
LW		 5334 kid = kid->op_sibling;
5335 }
5336 }
5337
5338 if (!kid)
54b9620d 5339 append_elem(o->op_type, o, newDEFSVOP());
79072805 5340
5dc0d613 5341 o = listkids(o);
bbce6d69 5342
5dc0d613 5343 o->op_private = 0;
36477c24 5344#ifdef USE_LOCALE
3280af22 5345 if (PL_hints & HINT_LOCALE)
5dc0d613 5346 o->op_private |= OPpLOCALE;
bbce6d69 5347#endif
5348
5dc0d613 5349 return o;
bbce6d69 5350}
5351
5352OP *
cea2e8a9 5353Perl_ck_fun_locale(pTHX_ OP *o)
bbce6d69 5354{
5dc0d613 5355 o = ck_fun(o);
bbce6d69 5356
5dc0d613 5357 o->op_private = 0;
36477c24 5358#ifdef USE_LOCALE
3280af22 5359 if (PL_hints & HINT_LOCALE)
5dc0d613 5360 o->op_private |= OPpLOCALE;
bbce6d69 5361#endif
5362
5dc0d613 5363 return o;
bbce6d69 5364}
5365
5366OP *
b162f9ea
IZ		 5367Perl_ck_sassign(pTHX_ OP *o)
5368{
5369 OP *kid = cLISTOPo->op_first;
5370 /* has a disposable target? */
5371 if ((PL_opargs[kid->op_type] & OA_TARGLEX)
5372 && !(kid->op_flags & OPf_STACKED))
5373 {
5374 OP *kkid = kid->op_sibling;
5375
5376 /* Can just relocate the target. */
2c2d71f5
JH		 5377 if (kkid && kkid->op_type == OP_PADSV
5378 && !(kkid->op_private & OPpLVAL_INTRO))
5379 {
b162f9ea 5380 /* Concat has problems if target is equal to right arg. */
3dbf192b
IZ		 5381 if (kid->op_type == OP_CONCAT) {
5382 if (kLISTOP->op_first->op_sibling->op_type == OP_PADSV
5383 && kLISTOP->op_first->op_sibling->op_targ == kkid->op_targ)
5384 return o;
b162f9ea 5385 }
3dbf192b
IZ		 5386 else if (kid->op_type == OP_JOIN) {
5387 /* do_join has problems if the arguments coincide with target.
c212fd85
IZ		 5388 In fact the second argument *can* safely coincide,
5389 but ignore=pessimize this rare occasion. */
5390 OP *arg = kLISTOP->op_first->op_sibling; /* Skip PUSHMARK */
5391
5392 while (arg) {
5393 if (arg->op_type == OP_PADSV
5394 && arg->op_targ == kkid->op_targ)
5395 return o;
5396 arg = arg->op_sibling;
5397 }
5398 }
3dbf192b
IZ		 5399 else if (kid->op_type == OP_QUOTEMETA) {
5400 /* quotemeta has problems if the argument coincides with target. */
5401 if (kLISTOP->op_first->op_type == OP_PADSV
5402 && kLISTOP->op_first->op_targ == kkid->op_targ)
5403 return o;
5404 }
b162f9ea
IZ		 5405 kid->op_targ = kkid->op_targ;
5406 /* Now we do not need PADSV and SASSIGN. */
5407 kid->op_sibling = o->op_sibling; /* NULL */
5408 cLISTOPo->op_first = NULL;
5409 op_free(o);
5410 op_free(kkid);
5411 kid->op_private |= OPpTARGET_MY; /* Used for context settings */
5412 return kid;
5413 }
5414 }
5415 return o;
5416}
5417
5418OP *
cea2e8a9 5419Perl_ck_scmp(pTHX_ OP *o)
bbce6d69 5420{
5dc0d613 5421 o->op_private = 0;
36477c24 5422#ifdef USE_LOCALE
3280af22 5423 if (PL_hints & HINT_LOCALE)
5dc0d613 5424 o->op_private |= OPpLOCALE;
bbce6d69 5425#endif
36477c24 5426
5dc0d613 5427 return o;
79072805
LW		 5428}
5429
5430OP *
cea2e8a9 5431Perl_ck_match(pTHX_ OP *o)
79072805 5432{
5dc0d613 5433 o->op_private |= OPpRUNTIME;
11343788 5434 return o;
79072805
LW		 5435}
5436
5437OP *
f5d5a27c
CS		 5438Perl_ck_method(pTHX_ OP *o)
5439{
5440 OP *kid = cUNOPo->op_first;
5441 if (kid->op_type == OP_CONST) {
5442 SV* sv = kSVOP->op_sv;
5443 if (!(strchr(SvPVX(sv), ':') || strchr(SvPVX(sv), '\''))) {
5444 OP *cmop;
5445 sv_upgrade(sv, SVt_PVIV);
5446 SvIOK_on(sv);
5447 PERL_HASH(SvUVX(sv), SvPVX(sv), SvCUR(sv));
5448 cmop = newSVOP(OP_METHOD_NAMED, 0, sv);
5449 kSVOP->op_sv = Nullsv;
5450 op_free(o);
5451 return cmop;
5452 }
5453 }
5454 return o;
5455}
5456
5457OP *
cea2e8a9 5458Perl_ck_null(pTHX_ OP *o)
79072805 5459{
11343788 5460 return o;
79072805
LW		 5461}
5462
5463OP *
cea2e8a9 5464Perl_ck_repeat(pTHX_ OP *o)
79072805 5465{
11343788
MB		 5466 if (cBINOPo->op_first->op_flags & OPf_PARENS) {
5467 o->op_private |= OPpREPEAT_DOLIST;
5468 cBINOPo->op_first = force_list(cBINOPo->op_first);
79072805
LW		 5469 }
5470 else
11343788
MB		 5471 scalar(o);
5472 return o;
79072805
LW		 5473}
5474
5475OP *
cea2e8a9 5476Perl_ck_require(pTHX_ OP *o)
8990e307 5477{
11343788
MB		 5478 if (o->op_flags & OPf_KIDS) { /* Shall we supply missing .pm? */
5479 SVOP *kid = (SVOP*)cUNOPo->op_first;
8990e307
LW		 5480
5481 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
8990e307 5482 char *s;
a0d0e21e
LW		 5483 for (s = SvPVX(kid->op_sv); *s; s++) {
5484 if (*s == ':' && s[1] == ':') {
5485 *s = '/';
1aef975c 5486 Move(s+2, s+1, strlen(s+2)+1, char);
a0d0e21e
LW		 5487 --SvCUR(kid->op_sv);
5488 }
8990e307 5489 }
a0d0e21e 5490 sv_catpvn(kid->op_sv, ".pm", 3);
8990e307
LW		 5491 }
5492 }
11343788 5493 return ck_fun(o);
8990e307
LW		 5494}
5495
22c35a8c 5496#if 0
8990e307 5497OP *
cea2e8a9 5498Perl_ck_retarget(pTHX_ OP *o)
79072805 5499{
cea2e8a9 5500 Perl_croak(aTHX_ "NOT IMPL LINE %d",__LINE__);
79072805 5501 /* STUB */
11343788 5502 return o;
79072805 5503}
22c35a8c 5504#endif
79072805
LW		 5505
5506OP *
cea2e8a9 5507Perl_ck_select(pTHX_ OP *o)
79072805 5508{
c07a80fd 5509 OP* kid;
11343788
MB		 5510 if (o->op_flags & OPf_KIDS) {
5511 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
2304df62 5512 if (kid && kid->op_sibling) {
11343788 5513 o->op_type = OP_SSELECT;
22c35a8c 5514 o->op_ppaddr = PL_ppaddr[OP_SSELECT];
11343788
MB		 5515 o = ck_fun(o);
5516 return fold_constants(o);
79072805
LW		 5517 }
5518 }
11343788
MB		 5519 o = ck_fun(o);
5520 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
c07a80fd 5521 if (kid && kid->op_type == OP_RV2GV)
5522 kid->op_private &= ~HINT_STRICT_REFS;
11343788 5523 return o;
79072805
LW		 5524}
5525
5526OP *
cea2e8a9 5527Perl_ck_shift(pTHX_ OP *o)
79072805 5528{
11343788 5529 I32 type = o->op_type;
79072805 5530
11343788 5531 if (!(o->op_flags & OPf_KIDS)) {
6d4ff0d2
MB		 5532 OP *argop;
5533
11343788 5534 op_free(o);
6d4ff0d2 5535#ifdef USE_THREADS
533c011a 5536 if (!CvUNIQUE(PL_compcv)) {
6d4ff0d2 5537 argop = newOP(OP_PADAV, OPf_REF);
6b88bc9c 5538 argop->op_targ = 0; /* PL_curpad[0] is @_ */
6d4ff0d2
MB		 5539 }
5540 else {
5541 argop = newUNOP(OP_RV2AV, 0,
5542 scalar(newGVOP(OP_GV, 0,
5543 gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
5544 }
5545#else
5546 argop = newUNOP(OP_RV2AV, 0,
3280af22
NIS		 5547 scalar(newGVOP(OP_GV, 0, !CvUNIQUE(PL_compcv) ?
5548 PL_defgv : gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
6d4ff0d2
MB		 5549#endif /* USE_THREADS */
5550 return newUNOP(type, 0, scalar(argop));
79072805 5551 }
11343788 5552 return scalar(modkids(ck_fun(o), type));
79072805
LW		 5553}
5554
5555OP *
cea2e8a9 5556Perl_ck_sort(pTHX_ OP *o)
79072805 5557{
5dc0d613 5558 o->op_private = 0;
36477c24 5559#ifdef USE_LOCALE
3280af22 5560 if (PL_hints & HINT_LOCALE)
5dc0d613 5561 o->op_private |= OPpLOCALE;
bbce6d69 5562#endif
5563
9ea6e965 5564 if (o->op_type == OP_SORT && o->op_flags & OPf_STACKED)
51a19bc0 5565 simplify_sort(o);
9c007264 5566 if (o->op_flags & OPf_STACKED) { /* may have been cleared */
11343788 5567 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
463ee0b2 5568 OP *k;
82092f1d 5569 kid = kUNOP->op_first; /* get past null */
79072805 5570
463ee0b2 5571 if (kid->op_type == OP_SCOPE || kid->op_type == OP_LEAVE) {
79072805 5572 linklist(kid);
463ee0b2
LW		 5573 if (kid->op_type == OP_SCOPE) {
5574 k = kid->op_next;
5575 kid->op_next = 0;
79072805 5576 }
463ee0b2 5577 else if (kid->op_type == OP_LEAVE) {
11343788 5578 if (o->op_type == OP_SORT) {
748a9306
LW		 5579 null(kid); /* wipe out leave */
5580 kid->op_next = kid;
463ee0b2 5581
748a9306
LW		 5582 for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
5583 if (k->op_next == kid)
5584 k->op_next = 0;
5585 }
463ee0b2 5586 }
748a9306
LW		 5587 else
5588 kid->op_next = 0; /* just disconnect the leave */
a0d0e21e 5589 k = kLISTOP->op_first;
463ee0b2 5590 }
a0d0e21e
LW		 5591 peep(k);
5592
11343788 5593 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
11343788 5594 if (o->op_type == OP_SORT)
a0d0e21e
LW		 5595 kid->op_next = kid;
5596 else
5597 kid->op_next = k;
11343788 5598 o->op_flags |= OPf_SPECIAL;
79072805 5599 }
c6e96bcb
GS		 5600 else if (kid->op_type == OP_RV2SV || kid->op_type == OP_PADSV)
5601 null(cLISTOPo->op_first->op_sibling);
79072805 5602 }
bbce6d69 5603
11343788 5604 return o;
79072805 5605}
bda4119b
GS		 5606
5607STATIC void
cea2e8a9 5608S_simplify_sort(pTHX_ OP *o)
9c007264 5609{
51a19bc0 5610 dTHR;
9c007264
JH		 5611 register OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
5612 OP *k;
5613 int reversed;
5614 if (!(o->op_flags & OPf_STACKED))
5615 return;
9ea6e965
GS		 5616 GvMULTI_on(gv_fetchpv("a", TRUE, SVt_PV));
5617 GvMULTI_on(gv_fetchpv("b", TRUE, SVt_PV));
82092f1d 5618 kid = kUNOP->op_first; /* get past null */
9c007264
JH		 5619 if (kid->op_type != OP_SCOPE)
5620 return;
5621 kid = kLISTOP->op_last; /* get past scope */
5622 switch(kid->op_type) {
5623 case OP_NCMP:
5624 case OP_I_NCMP:
5625 case OP_SCMP:
5626 break;
5627 default:
5628 return;
5629 }
5630 k = kid; /* remember this node*/
5631 if (kBINOP->op_first->op_type != OP_RV2SV)
5632 return;
5633 kid = kBINOP->op_first; /* get past cmp */
5634 if (kUNOP->op_first->op_type != OP_GV)
5635 return;
5636 kid = kUNOP->op_first; /* get past rv2sv */
5637 if (GvSTASH(kGVOP->op_gv) != PL_curstash)
5638 return;
5639 if (strEQ(GvNAME(kGVOP->op_gv), "a"))
5640 reversed = 0;
5641 else if(strEQ(GvNAME(kGVOP->op_gv), "b"))
5642 reversed = 1;
5643 else
5644 return;
5645 kid = k; /* back to cmp */
5646 if (kBINOP->op_last->op_type != OP_RV2SV)
5647 return;
5648 kid = kBINOP->op_last; /* down to 2nd arg */
5649 if (kUNOP->op_first->op_type != OP_GV)
5650 return;
5651 kid = kUNOP->op_first; /* get past rv2sv */
5652 if (GvSTASH(kGVOP->op_gv) != PL_curstash
5653 || ( reversed
5654 ? strNE(GvNAME(kGVOP->op_gv), "a")
5655 : strNE(GvNAME(kGVOP->op_gv), "b")))
5656 return;
5657 o->op_flags &= ~(OPf_STACKED | OPf_SPECIAL);
5658 if (reversed)
5659 o->op_private |= OPpSORT_REVERSE;
5660 if (k->op_type == OP_NCMP)
5661 o->op_private |= OPpSORT_NUMERIC;
5662 if (k->op_type == OP_I_NCMP)
5663 o->op_private |= OPpSORT_NUMERIC | OPpSORT_INTEGER;
e507f050
SM		 5664 kid = cLISTOPo->op_first->op_sibling;
5665 cLISTOPo->op_first->op_sibling = kid->op_sibling; /* bypass old block */
5666 op_free(kid); /* then delete it */
5667 cLISTOPo->op_children--;
9c007264 5668}
79072805
LW		 5669
5670OP *
cea2e8a9 5671Perl_ck_split(pTHX_ OP *o)
79072805
LW		 5672{
5673 register OP *kid;
aeea060c 5674
11343788
MB		 5675 if (o->op_flags & OPf_STACKED)
5676 return no_fh_allowed(o);
79072805 5677
11343788 5678 kid = cLISTOPo->op_first;
8990e307 5679 if (kid->op_type != OP_NULL)
cea2e8a9 5680 Perl_croak(aTHX_ "panic: ck_split");
8990e307 5681 kid = kid->op_sibling;
11343788
MB		 5682 op_free(cLISTOPo->op_first);
5683 cLISTOPo->op_first = kid;
85e6fe83 5684 if (!kid) {
79cb57f6 5685 cLISTOPo->op_first = kid = newSVOP(OP_CONST, 0, newSVpvn(" ", 1));
11343788 5686 cLISTOPo->op_last = kid; /* There was only one element previously */
85e6fe83 5687 }
79072805
LW		 5688
5689 if (kid->op_type != OP_MATCH) {
5690 OP *sibl = kid->op_sibling;
463ee0b2 5691 kid->op_sibling = 0;
79072805 5692 kid = pmruntime( newPMOP(OP_MATCH, OPf_SPECIAL), kid, Nullop);
11343788
MB		 5693 if (cLISTOPo->op_first == cLISTOPo->op_last)
5694 cLISTOPo->op_last = kid;
5695 cLISTOPo->op_first = kid;
79072805
LW		 5696 kid->op_sibling = sibl;
5697 }
5698
5699 kid->op_type = OP_PUSHRE;
22c35a8c 5700 kid->op_ppaddr = PL_ppaddr[OP_PUSHRE];
79072805
LW		 5701 scalar(kid);
5702
5703 if (!kid->op_sibling)
54b9620d 5704 append_elem(OP_SPLIT, o, newDEFSVOP());
79072805
LW		 5705
5706 kid = kid->op_sibling;
5707 scalar(kid);
5708
5709 if (!kid->op_sibling)
11343788 5710 append_elem(OP_SPLIT, o, newSVOP(OP_CONST, 0, newSViv(0)));
79072805
LW		 5711
5712 kid = kid->op_sibling;
5713 scalar(kid);
5714
5715 if (kid->op_sibling)
22c35a8c 5716 return too_many_arguments(o,PL_op_desc[o->op_type]);
79072805 5717
11343788 5718 return o;
79072805
LW		 5719}
5720
5721OP *
eb6e2d6f
GS		 5722Perl_ck_join(pTHX_ OP *o)
5723{
5724 if (ckWARN(WARN_SYNTAX)) {
5725 OP *kid = cLISTOPo->op_first->op_sibling;
5726 if (kid && kid->op_type == OP_MATCH) {
5727 char *pmstr = "STRING";
5728 if (kPMOP->op_pmregexp)
5729 pmstr = kPMOP->op_pmregexp->precomp;
5730 Perl_warner(aTHX_ WARN_SYNTAX,
5731 "/%s/ should probably be written as \"%s\"",
5732 pmstr, pmstr);
5733 }
5734 }
5735 return ck_fun(o);
5736}
5737
5738OP *
cea2e8a9 5739Perl_ck_subr(pTHX_ OP *o)
79072805 5740{
11343788
MB		 5741 dTHR;
5742 OP *prev = ((cUNOPo->op_first->op_sibling)
5743 ? cUNOPo : ((UNOP*)cUNOPo->op_first))->op_first;
5744 OP *o2 = prev->op_sibling;
4633a7c4
LW		 5745 OP *cvop;
5746 char *proto = 0;
5747 CV *cv = 0;
46fc3d4c 5748 GV *namegv = 0;
4633a7c4
LW		 5749 int optional = 0;
5750 I32 arg = 0;
2d8e6c8d 5751 STRLEN n_a;
4633a7c4 5752
d3011074 5753 o->op_private |= OPpENTERSUB_HASTARG;
11343788 5754 for (cvop = o2; cvop->op_sibling; cvop = cvop->op_sibling) ;
4633a7c4
LW		 5755 if (cvop->op_type == OP_RV2CV) {
5756 SVOP* tmpop;
11343788 5757 o->op_private |= (cvop->op_private & OPpENTERSUB_AMPER);
4633a7c4
LW		 5758 null(cvop); /* disable rv2cv */
5759 tmpop = (SVOP*)((UNOP*)cvop)->op_first;
76cd736e 5760 if (tmpop->op_type == OP_GV && !(o->op_private & OPpENTERSUB_AMPER)) {
8ebc5c01 5761 cv = GvCVu(tmpop->op_sv);
76cd736e
GS		 5762 if (!cv)
5763 tmpop->op_private |= OPpEARLY_CV;
5764 else if (SvPOK(cv)) {
46fc3d4c 5765 namegv = CvANON(cv) ? (GV*)tmpop->op_sv : CvGV(cv);
2d8e6c8d 5766 proto = SvPV((SV*)cv, n_a);
46fc3d4c 5767 }
4633a7c4
LW		 5768 }
5769 }
f5d5a27c 5770 else if (cvop->op_type == OP_METHOD || cvop->op_type == OP_METHOD_NAMED) {
7a52d87a
GS		 5771 if (o2->op_type == OP_CONST)
5772 o2->op_private &= ~OPpCONST_STRICT;
58a40671
GS		 5773 else if (o2->op_type == OP_LIST) {
5774 OP *o = ((UNOP*)o2)->op_first->op_sibling;
5775 if (o && o->op_type == OP_CONST)
5776 o->op_private &= ~OPpCONST_STRICT;
5777 }
7a52d87a 5778 }
3280af22
NIS		 5779 o->op_private |= (PL_hints & HINT_STRICT_REFS);
5780 if (PERLDB_SUB && PL_curstash != PL_debstash)
11343788
MB		 5781 o->op_private |= OPpENTERSUB_DB;
5782 while (o2 != cvop) {
4633a7c4
LW		 5783 if (proto) {
5784 switch (*proto) {
5785 case '\0':
5dc0d613 5786 return too_many_arguments(o, gv_ename(namegv));
4633a7c4
LW		 5787 case ';':
5788 optional = 1;
5789 proto++;
5790 continue;
5791 case '$':
5792 proto++;
5793 arg++;
11343788 5794 scalar(o2);
4633a7c4
LW		 5795 break;
5796 case '%':
5797 case '@':
11343788 5798 list(o2);
4633a7c4
LW		 5799 arg++;
5800 break;
5801 case '&':
5802 proto++;
5803 arg++;
11343788 5804 if (o2->op_type != OP_REFGEN && o2->op_type != OP_UNDEF)
5dc0d613 5805 bad_type(arg, "block", gv_ename(namegv), o2);
4633a7c4
LW		 5806 break;
5807 case '*':
2ba6ecf4 5808 /* '*' allows any scalar type, including bareword */
4633a7c4
LW		 5809 proto++;
5810 arg++;
11343788 5811 if (o2->op_type == OP_RV2GV)
2ba6ecf4 5812 goto wrapref; /* autoconvert GLOB -> GLOBref */
7a52d87a
GS		 5813 else if (o2->op_type == OP_CONST)
5814 o2->op_private &= ~OPpCONST_STRICT;
9675f7ac
GS		 5815 else if (o2->op_type == OP_ENTERSUB) {
5816 /* accidental subroutine, revert to bareword */
5817 OP *gvop = ((UNOP*)o2)->op_first;
5818 if (gvop && gvop->op_type == OP_NULL) {
5819 gvop = ((UNOP*)gvop)->op_first;
5820 if (gvop) {
5821 for (; gvop->op_sibling; gvop = gvop->op_sibling)
5822 ;
5823 if (gvop &&
5824 (gvop->op_private & OPpENTERSUB_NOPAREN) &&
5825 (gvop = ((UNOP*)gvop)->op_first) &&
5826 gvop->op_type == OP_GV)
5827 {
5828 GV *gv = (GV*)((SVOP*)gvop)->op_sv;
5829 OP *sibling = o2->op_sibling;
2692f720 5830 SV *n = newSVpvn("",0);
9675f7ac 5831 op_free(o2);
2692f720
GS		 5832 gv_fullname3(n, gv, "");
5833 if (SvCUR(n)>6 && strnEQ(SvPVX(n),"main::",6))
5834 sv_chop(n, SvPVX(n)+6);
5835 o2 = newSVOP(OP_CONST, 0, n);
9675f7ac
GS		 5836 prev->op_sibling = o2;
5837 o2->op_sibling = sibling;
5838 }
5839 }
5840 }
5841 }
2ba6ecf4
GS		 5842 scalar(o2);
5843 break;
4633a7c4
LW		 5844 case '\\':
5845 proto++;
5846 arg++;
5847 switch (*proto++) {
5848 case '*':
11343788 5849 if (o2->op_type != OP_RV2GV)
5dc0d613 5850 bad_type(arg, "symbol", gv_ename(namegv), o2);
4633a7c4
LW		 5851 goto wrapref;
5852 case '&':
11343788 5853 if (o2->op_type != OP_RV2CV)
5dc0d613 5854 bad_type(arg, "sub", gv_ename(namegv), o2);
4633a7c4
LW		 5855 goto wrapref;
5856 case '$':
386acf99
GS		 5857 if (o2->op_type != OP_RV2SV
5858 && o2->op_type != OP_PADSV
1c01eb51
GS		 5859 && o2->op_type != OP_HELEM
5860 && o2->op_type != OP_AELEM
386acf99
GS		 5861 && o2->op_type != OP_THREADSV)
5862 {
5dc0d613 5863 bad_type(arg, "scalar", gv_ename(namegv), o2);
386acf99 5864 }
4633a7c4
LW		 5865 goto wrapref;
5866 case '@':
11343788 5867 if (o2->op_type != OP_RV2AV && o2->op_type != OP_PADAV)
5dc0d613 5868 bad_type(arg, "array", gv_ename(namegv), o2);
4633a7c4
LW		 5869 goto wrapref;
5870 case '%':
11343788 5871 if (o2->op_type != OP_RV2HV && o2->op_type != OP_PADHV)
5dc0d613 5872 bad_type(arg, "hash", gv_ename(namegv), o2);
4633a7c4
LW		 5873 wrapref:
5874 {
11343788 5875 OP* kid = o2;
6fa846a0 5876 OP* sib = kid->op_sibling;
4633a7c4 5877 kid->op_sibling = 0;
6fa846a0
GS		 5878 o2 = newUNOP(OP_REFGEN, 0, kid);
5879 o2->op_sibling = sib;
e858de61 5880 prev->op_sibling = o2;
4633a7c4
LW		 5881 }
5882 break;
5883 default: goto oops;
5884 }
5885 break;
b1cb66bf 5886 case ' ':
5887 proto++;
5888 continue;
4633a7c4
LW		 5889 default:
5890 oops:
cea2e8a9 5891 Perl_croak(aTHX_ "Malformed prototype for %s: %s",
2d8e6c8d 5892 gv_ename(namegv), SvPV((SV*)cv, n_a));
4633a7c4
LW		 5893 }
5894 }
5895 else
11343788
MB		 5896 list(o2);
5897 mod(o2, OP_ENTERSUB);
5898 prev = o2;
5899 o2 = o2->op_sibling;
4633a7c4 5900 }
fb73857a 5901 if (proto && !optional &&
5902 (*proto && *proto != '@' && *proto != '%' && *proto != ';'))
5dc0d613 5903 return too_few_arguments(o, gv_ename(namegv));
11343788 5904 return o;
79072805
LW		 5905}
5906
5907OP *
cea2e8a9 5908Perl_ck_svconst(pTHX_ OP *o)
8990e307 5909{
11343788
MB		 5910 SvREADONLY_on(cSVOPo->op_sv);
5911 return o;
8990e307
LW		 5912}
5913
5914OP *
cea2e8a9 5915Perl_ck_trunc(pTHX_ OP *o)
79072805 5916{
11343788
MB		 5917 if (o->op_flags & OPf_KIDS) {
5918 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 5919
a0d0e21e
LW		 5920 if (kid->op_type == OP_NULL)
5921 kid = (SVOP*)kid->op_sibling;
bb53490d
GS		 5922 if (kid && kid->op_type == OP_CONST &&
5923 (kid->op_private & OPpCONST_BARE))
5924 {
11343788 5925 o->op_flags |= OPf_SPECIAL;
bb53490d
GS		 5926 kid->op_private &= ~OPpCONST_STRICT;
5927 }
79072805 5928 }
11343788 5929 return ck_fun(o);
79072805
LW		 5930}
5931
463ee0b2
LW		 5932/* A peephole optimizer. We visit the ops in the order they're to execute. */
5933
79072805 5934void
864dbfa3 5935Perl_peep(pTHX_ register OP *o)
79072805 5936{
11343788 5937 dTHR;
79072805 5938 register OP* oldop = 0;
2d8e6c8d 5939 STRLEN n_a;
cd06dffe 5940 OP *last_composite = Nullop;
2d8e6c8d 5941
a0d0e21e 5942 if (!o || o->op_seq)
79072805 5943 return;
a0d0e21e 5944 ENTER;
462e5cf6 5945 SAVEOP();
3280af22 5946 SAVESPTR(PL_curcop);
a0d0e21e
LW		 5947 for (; o; o = o->op_next) {
5948 if (o->op_seq)
5949 break;
3280af22
NIS		 5950 if (!PL_op_seqmax)
5951 PL_op_seqmax++;
533c011a 5952 PL_op = o;
a0d0e21e 5953 switch (o->op_type) {
acb36ea4 5954 case OP_SETSTATE:
a0d0e21e
LW		 5955 case OP_NEXTSTATE:
5956 case OP_DBSTATE:
3280af22
NIS		 5957 PL_curcop = ((COP*)o); /* for warnings */
5958 o->op_seq = PL_op_seqmax++;
cd06dffe 5959 last_composite = Nullop;
a0d0e21e
LW		 5960 break;
5961
a0d0e21e 5962 case OP_CONST:
7a52d87a
GS		 5963 if (cSVOPo->op_private & OPpCONST_STRICT)
5964 no_bareword_allowed(o);
5965 /* FALL THROUGH */
a0d0e21e
LW		 5966 case OP_UC:
5967 case OP_UCFIRST:
5968 case OP_LC:
5969 case OP_LCFIRST:
ed7ab888
GS		 5970 if ( o->op_next && o->op_next->op_type == OP_STRINGIFY
5971 && !(o->op_next->op_private & OPpTARGET_MY) )
5972 null(o->op_next);
5973 o->op_seq = PL_op_seqmax++;
5974 break;
5975 case OP_CONCAT:
5976 case OP_JOIN:
a0d0e21e 5977 case OP_QUOTEMETA:
b162f9ea
IZ		 5978 if (o->op_next && o->op_next->op_type == OP_STRINGIFY) {
5979 if (o->op_next->op_private & OPpTARGET_MY) {
ed7ab888 5980 if ((o->op_flags & OPf_STACKED) /* chained concats */
b162f9ea
IZ		 5981 || (o->op_type == OP_CONCAT
5982 /* Concat has problems if target is equal to right arg. */
5983 && (((LISTOP*)o)->op_first->op_sibling->op_type
5984 == OP_PADSV)
5985 && (((LISTOP*)o)->op_first->op_sibling->op_targ
5986 == o->op_next->op_targ))) {
5987 goto ignore_optimization;
cd06dffe
GS		 5988 }
5989 else {
b162f9ea 5990 o->op_targ = o->op_next->op_targ;
2c2d71f5 5991 o->op_private |= OPpTARGET_MY;
b162f9ea
IZ		 5992 }
5993 }
a0d0e21e 5994 null(o->op_next);
b162f9ea
IZ		 5995 }
5996 ignore_optimization:
3280af22 5997 o->op_seq = PL_op_seqmax++;
a0d0e21e 5998 break;
8990e307 5999 case OP_STUB:
54310121 6000 if ((o->op_flags & OPf_WANT) != OPf_WANT_LIST) {
3280af22 6001 o->op_seq = PL_op_seqmax++;
54310121 6002 break; /* Scalar stub must produce undef. List stub is noop */
8990e307 6003 }
748a9306 6004 goto nothin;
79072805 6005 case OP_NULL:
acb36ea4
GS		 6006 if (o->op_targ == OP_NEXTSTATE
6007 || o->op_targ == OP_DBSTATE
6008 || o->op_targ == OP_SETSTATE)
6009 {
3280af22 6010 PL_curcop = ((COP*)o);
acb36ea4 6011 }
748a9306 6012 goto nothin;
79072805 6013 case OP_SCALAR:
93a17b20 6014 case OP_LINESEQ:
463ee0b2 6015 case OP_SCOPE:
748a9306 6016 nothin:
a0d0e21e
LW		 6017 if (oldop && o->op_next) {
6018 oldop->op_next = o->op_next;
79072805
LW		 6019 continue;
6020 }
3280af22 6021 o->op_seq = PL_op_seqmax++;
79072805
LW		 6022 break;
6023
6024 case OP_GV:
a0d0e21e 6025 if (o->op_next->op_type == OP_RV2SV) {
5f05dabc 6026 if (!(o->op_next->op_private & OPpDEREF)) {
a0d0e21e
LW		 6027 null(o->op_next);
6028 o->op_private |= o->op_next->op_private & OPpLVAL_INTRO;
6029 o->op_next = o->op_next->op_next;
6030 o->op_type = OP_GVSV;
22c35a8c 6031 o->op_ppaddr = PL_ppaddr[OP_GVSV];
8990e307
LW		 6032 }
6033 }
a0d0e21e
LW		 6034 else if (o->op_next->op_type == OP_RV2AV) {
6035 OP* pop = o->op_next->op_next;
6036 IV i;
8990e307 6037 if (pop->op_type == OP_CONST &&
533c011a 6038 (PL_op = pop->op_next) &&
8990e307 6039 pop->op_next->op_type == OP_AELEM &&
a0d0e21e 6040 !(pop->op_next->op_private &
68dc0745 6041 (OPpLVAL_INTRO|OPpLVAL_DEFER|OPpDEREF)) &&
3280af22 6042 (i = SvIV(((SVOP*)pop)->op_sv) - PL_compiling.cop_arybase)
a0d0e21e 6043 <= 255 &&
8990e307
LW		 6044 i >= 0)
6045 {
a0d0e21e 6046 null(o->op_next);
8990e307
LW		 6047 null(pop->op_next);
6048 null(pop);
a0d0e21e
LW		 6049 o->op_flags |= pop->op_next->op_flags & OPf_MOD;
6050 o->op_next = pop->op_next->op_next;
6051 o->op_type = OP_AELEMFAST;
22c35a8c 6052 o->op_ppaddr = PL_ppaddr[OP_AELEMFAST];
a0d0e21e 6053 o->op_private = (U8)i;
a6006777 6054 GvAVn(((GVOP*)o)->op_gv);
8990e307 6055 }
79072805 6056 }
76cd736e
GS		 6057 else if ((o->op_private & OPpEARLY_CV) && ckWARN(WARN_UNSAFE)) {
6058 GV *gv = cGVOPo->op_gv;
6059 if (SvTYPE(gv) == SVt_PVGV && GvCV(gv) && SvPVX(GvCV(gv))) {
6060 /* XXX could check prototype here instead of just carping */
6061 SV *sv = sv_newmortal();
6062 gv_efullname3(sv, gv, Nullch);
6063 Perl_warner(aTHX_ WARN_UNSAFE,
6064 "%s() called too early to check prototype",
6065 SvPV_nolen(sv));
6066 }
6067 }
6068
3280af22 6069 o->op_seq = PL_op_seqmax++;
79072805
LW		 6070 break;
6071
a0d0e21e 6072 case OP_MAPWHILE:
79072805
LW		 6073 case OP_GREPWHILE:
6074 case OP_AND:
6075 case OP_OR:
2c2d71f5
JH		 6076 case OP_ANDASSIGN:
6077 case OP_ORASSIGN:
1a67a97c
SM		 6078 case OP_COND_EXPR:
6079 case OP_RANGE:
3280af22 6080 o->op_seq = PL_op_seqmax++;
fd4d1407
IZ		 6081 while (cLOGOP->op_other->op_type == OP_NULL)
6082 cLOGOP->op_other = cLOGOP->op_other->op_next;
79072805
LW		 6083 peep(cLOGOP->op_other);
6084 break;
6085
79072805 6086 case OP_ENTERLOOP:
3280af22 6087 o->op_seq = PL_op_seqmax++;
79072805
LW		 6088 peep(cLOOP->op_redoop);
6089 peep(cLOOP->op_nextop);
6090 peep(cLOOP->op_lastop);
6091 break;
6092
8782bef2 6093 case OP_QR:
79072805
LW		 6094 case OP_MATCH:
6095 case OP_SUBST:
3280af22 6096 o->op_seq = PL_op_seqmax++;
a0d0e21e 6097 peep(cPMOP->op_pmreplstart);
79072805
LW		 6098 break;
6099
a0d0e21e 6100 case OP_EXEC:
3280af22 6101 o->op_seq = PL_op_seqmax++;
599cee73
PM		 6102 if (ckWARN(WARN_SYNTAX) && o->op_next
6103 && o->op_next->op_type == OP_NEXTSTATE) {
a0d0e21e 6104 if (o->op_next->op_sibling &&
20408e3c
GS		 6105 o->op_next->op_sibling->op_type != OP_EXIT &&
6106 o->op_next->op_sibling->op_type != OP_WARN &&
a0d0e21e 6107 o->op_next->op_sibling->op_type != OP_DIE) {
3280af22 6108 line_t oldline = PL_curcop->cop_line;
a0d0e21e 6109
3280af22 6110 PL_curcop->cop_line = ((COP*)o->op_next)->cop_line;
cea2e8a9
GS		 6111 Perl_warner(aTHX_ WARN_SYNTAX, "Statement unlikely to be reached");
6112 Perl_warner(aTHX_ WARN_SYNTAX, "(Maybe you meant system() when you said exec()?)\n");
3280af22 6113 PL_curcop->cop_line = oldline;
a0d0e21e
LW		 6114 }
6115 }
6116 break;
aeea060c 6117
c750a3ec
MB		 6118 case OP_HELEM: {
6119 UNOP *rop;
6120 SV *lexname;
6121 GV **fields;
6122 SV **svp, **indsvp;
6123 I32 ind;
6124 char *key;
6125 STRLEN keylen;
aeea060c 6126
377b21bb 6127 if ((o->op_private & (OPpLVAL_INTRO))
c750a3ec
MB		 6128 || ((BINOP*)o)->op_last->op_type != OP_CONST)
6129 break;
6130 rop = (UNOP*)((BINOP*)o)->op_first;
6131 if (rop->op_type != OP_RV2HV || rop->op_first->op_type != OP_PADSV)
6132 break;
3280af22 6133 lexname = *av_fetch(PL_comppad_name, rop->op_first->op_targ, TRUE);
c750a3ec
MB		 6134 if (!SvOBJECT(lexname))
6135 break;
5196be3e 6136 fields = (GV**)hv_fetch(SvSTASH(lexname), "FIELDS", 6, FALSE);
c750a3ec
MB		 6137 if (!fields || !GvHV(*fields))
6138 break;
6139 svp = &((SVOP*)((BINOP*)o)->op_last)->op_sv;
6140 key = SvPV(*svp, keylen);
6141 indsvp = hv_fetch(GvHV(*fields), key, keylen, FALSE);
6142 if (!indsvp) {
88e9b055 6143 Perl_croak(aTHX_ "No such pseudo-hash field \"%s\" in variable %s of type %s",
2d8e6c8d 6144 key, SvPV(lexname, n_a), HvNAME(SvSTASH(lexname)));
c750a3ec
MB		 6145 }
6146 ind = SvIV(*indsvp);
6147 if (ind < 1)
cea2e8a9 6148 Perl_croak(aTHX_ "Bad index while coercing array into hash");
c750a3ec 6149 rop->op_type = OP_RV2AV;
22c35a8c 6150 rop->op_ppaddr = PL_ppaddr[OP_RV2AV];
c750a3ec 6151 o->op_type = OP_AELEM;
22c35a8c 6152 o->op_ppaddr = PL_ppaddr[OP_AELEM];
c750a3ec
MB		 6153 SvREFCNT_dec(*svp);
6154 *svp = newSViv(ind);
6155 break;
6156 }
6157
cd06dffe
GS		 6158 case OP_RV2AV:
6159 case OP_RV2HV:
6160 if (!(o->op_flags & OPf_WANT)
6161 || o->op_flags & OPf_WANT == OPf_WANT_LIST)
6162 last_composite = o;
6163 o->op_seq = PL_op_seqmax++;
6164 break;
6165
6166 case OP_RETURN:
6167 if (o->op_next->op_type != OP_LEAVESUBLV) {
6168 o->op_seq = PL_op_seqmax++;
6169 break;
6170 }
6171 /* FALL THROUGH */
6172
6173 case OP_LEAVESUBLV:
6174 if (last_composite) {
6175 OP *r = last_composite;
6176
6177 while (r->op_sibling)
6178 r = r->op_sibling;
6179 if (r->op_next == o
6180 || (r->op_next->op_type == OP_LIST
6181 && r->op_next->op_next == o))
6182 {
6183 if (last_composite->op_type == OP_RV2AV)
6184 yyerror("Lvalue subs returning arrays not implemented yet");
6185 else
6186 yyerror("Lvalue subs returning hashes not implemented yet");
6187 ;
6188 }
6189 }
6190 /* FALL THROUGH */
6191
79072805 6192 default:
3280af22 6193 o->op_seq = PL_op_seqmax++;
79072805
LW		 6194 break;
6195 }
a0d0e21e 6196 oldop = o;
79072805 6197 }
a0d0e21e 6198 LEAVE;
79072805 6199}
Unnamed repository; edit this file 'description' to name the repository.