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[perl5.git] / op.c
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a0d0e21e 1/* op.c
79072805 2 *
4bb101f2 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
cbdf9ef8 4 * 2000, 2001, 2002, 2003, 2004, 2005, by Larry Wall and others
79072805
LW		 5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW		 9 */
10
11/*
12 * "You see: Mr. Drogo, he married poor Miss Primula Brandybuck. She was
13 * our Mr. Bilbo's first cousin on the mother's side (her mother being the
14 * youngest of the Old Took's daughters); and Mr. Drogo was his second
15 * cousin. So Mr. Frodo is his first *and* second cousin, once removed
16 * either way, as the saying is, if you follow me." --the Gaffer
79072805
LW		 17 */
18
166f8a29
DM		 19/* This file contains the functions that create, manipulate and optimize
20 * the OP structures that hold a compiled perl program.
21 *
22 * A Perl program is compiled into a tree of OPs. Each op contains
23 * structural pointers (eg to its siblings and the next op in the
24 * execution sequence), a pointer to the function that would execute the
25 * op, plus any data specific to that op. For example, an OP_CONST op
26 * points to the pp_const() function and to an SV containing the constant
27 * value. When pp_const() is executed, its job is to push that SV onto the
28 * stack.
29 *
30 * OPs are mainly created by the newFOO() functions, which are mainly
31 * called from the parser (in perly.y) as the code is parsed. For example
32 * the Perl code $a + $b * $c would cause the equivalent of the following
33 * to be called (oversimplifying a bit):
34 *
35 * newBINOP(OP_ADD, flags,
36 * newSVREF($a),
37 * newBINOP(OP_MULTIPLY, flags, newSVREF($b), newSVREF($c))
38 * )
39 *
40 * Note that during the build of miniperl, a temporary copy of this file
41 * is made, called opmini.c.
42 */
ccfc67b7 43
61b743bb
DM		 44/*
45Perl's compiler is essentially a 3-pass compiler with interleaved phases:
46
47 A bottom-up pass
48 A top-down pass
49 An execution-order pass
50
51The bottom-up pass is represented by all the "newOP" routines and
52the ck_ routines. The bottom-upness is actually driven by yacc.
53So at the point that a ck_ routine fires, we have no idea what the
54context is, either upward in the syntax tree, or either forward or
55backward in the execution order. (The bottom-up parser builds that
56part of the execution order it knows about, but if you follow the "next"
57links around, you'll find it's actually a closed loop through the
58top level node.
59
60Whenever the bottom-up parser gets to a node that supplies context to
61its components, it invokes that portion of the top-down pass that applies
62to that part of the subtree (and marks the top node as processed, so
63if a node further up supplies context, it doesn't have to take the
64plunge again). As a particular subcase of this, as the new node is
65built, it takes all the closed execution loops of its subcomponents
66and links them into a new closed loop for the higher level node. But
67it's still not the real execution order.
68
69The actual execution order is not known till we get a grammar reduction
70to a top-level unit like a subroutine or file that will be called by
71"name" rather than via a "next" pointer. At that point, we can call
72into peep() to do that code's portion of the 3rd pass. It has to be
73recursive, but it's recursive on basic blocks, not on tree nodes.
74*/
75
79072805 76#include "EXTERN.h"
864dbfa3 77#define PERL_IN_OP_C
79072805 78#include "perl.h"
77ca0c92 79#include "keywords.h"
79072805 80
a07e034d 81#define CALL_PEEP(o) CALL_FPTR(PL_peepp)(aTHX_ o)
a2efc822 82
238a4c30
NIS		 83#if defined(PL_OP_SLAB_ALLOC)
84
85#ifndef PERL_SLAB_SIZE
86#define PERL_SLAB_SIZE 2048
87#endif
88
c7e45529
AE		 89void *
90Perl_Slab_Alloc(pTHX_ int m, size_t sz)
1c846c1f 91{
5a8e194f
NIS		 92 /*
93 * To make incrementing use count easy PL_OpSlab is an I32 *
94 * To make inserting the link to slab PL_OpPtr is I32 **
95 * So compute size in units of sizeof(I32 *) as that is how Pl_OpPtr increments
96 * Add an overhead for pointer to slab and round up as a number of pointers
97 */
98 sz = (sz + 2*sizeof(I32 *) -1)/sizeof(I32 *);
238a4c30 99 if ((PL_OpSpace -= sz) < 0) {
083fcd59
JH		 100 PL_OpPtr = (I32 **) PerlMemShared_malloc(PERL_SLAB_SIZE*sizeof(I32*));
101 if (!PL_OpPtr) {
238a4c30
NIS		 102 return NULL;
103 }
5a8e194f
NIS		 104 Zero(PL_OpPtr,PERL_SLAB_SIZE,I32 **);
105 /* We reserve the 0'th I32 sized chunk as a use count */
106 PL_OpSlab = (I32 *) PL_OpPtr;
107 /* Reduce size by the use count word, and by the size we need.
108 * Latter is to mimic the '-=' in the if() above
109 */
110 PL_OpSpace = PERL_SLAB_SIZE - (sizeof(I32)+sizeof(I32 **)-1)/sizeof(I32 **) - sz;
238a4c30
NIS		 111 /* Allocation pointer starts at the top.
112 Theory: because we build leaves before trunk allocating at end
113 means that at run time access is cache friendly upward
114 */
5a8e194f 115 PL_OpPtr += PERL_SLAB_SIZE;
238a4c30
NIS		 116 }
117 assert( PL_OpSpace >= 0 );
118 /* Move the allocation pointer down */
119 PL_OpPtr -= sz;
5a8e194f 120 assert( PL_OpPtr > (I32 **) PL_OpSlab );
238a4c30
NIS		 121 *PL_OpPtr = PL_OpSlab; /* Note which slab it belongs to */
122 (*PL_OpSlab)++; /* Increment use count of slab */
5a8e194f 123 assert( PL_OpPtr+sz <= ((I32 **) PL_OpSlab + PERL_SLAB_SIZE) );
238a4c30
NIS		 124 assert( *PL_OpSlab > 0 );
125 return (void *)(PL_OpPtr + 1);
126}
127
c7e45529
AE		 128void
129Perl_Slab_Free(pTHX_ void *op)
238a4c30 130{
5a8e194f
NIS		 131 I32 **ptr = (I32 **) op;
132 I32 *slab = ptr[-1];
133 assert( ptr-1 > (I32 **) slab );
134 assert( ptr < ( (I32 **) slab + PERL_SLAB_SIZE) );
238a4c30
NIS		 135 assert( *slab > 0 );
136 if (--(*slab) == 0) {
7e4e8c89
NC		 137# ifdef NETWARE
138# define PerlMemShared PerlMem
139# endif
083fcd59
JH		 140
141 PerlMemShared_free(slab);
238a4c30
NIS		 142 if (slab == PL_OpSlab) {
143 PL_OpSpace = 0;
144 }
145 }
b7dc083c 146}
b7dc083c 147#endif
e50aee73 148/*
5dc0d613 149 * In the following definition, the ", Nullop" is just to make the compiler
a5f75d66 150 * think the expression is of the right type: croak actually does a Siglongjmp.
e50aee73 151 */
11343788 152#define CHECKOP(type,o) \
3280af22 153 ((PL_op_mask && PL_op_mask[type]) \
5dc0d613 154 ? ( op_free((OP*)o), \
cb77fdf0 155 Perl_croak(aTHX_ "'%s' trapped by operation mask", PL_op_desc[type]), \
28757baa 156 Nullop ) \
fc0dc3b3 157 : CALL_FPTR(PL_check[type])(aTHX_ (OP*)o))
e50aee73 158
e6438c1a 159#define RETURN_UNLIMITED_NUMBER (PERL_INT_MAX / 2)
c53d7c7d 160
8b6b16e7 161STATIC const char*
cea2e8a9 162S_gv_ename(pTHX_ GV *gv)
4633a7c4
LW		 163{
164 SV* tmpsv = sv_newmortal();
46fc3d4c 165 gv_efullname3(tmpsv, gv, Nullch);
8b6b16e7 166 return SvPV_nolen_const(tmpsv);
4633a7c4
LW		 167}
168
76e3520e 169STATIC OP *
cea2e8a9 170S_no_fh_allowed(pTHX_ OP *o)
79072805 171{
cea2e8a9 172 yyerror(Perl_form(aTHX_ "Missing comma after first argument to %s function",
53e06cf0 173 OP_DESC(o)));
11343788 174 return o;
79072805
LW		 175}
176
76e3520e 177STATIC OP *
bfed75c6 178S_too_few_arguments(pTHX_ OP *o, const char *name)
79072805 179{
cea2e8a9 180 yyerror(Perl_form(aTHX_ "Not enough arguments for %s", name));
11343788 181 return o;
79072805
LW		 182}
183
76e3520e 184STATIC OP *
bfed75c6 185S_too_many_arguments(pTHX_ OP *o, const char *name)
79072805 186{
cea2e8a9 187 yyerror(Perl_form(aTHX_ "Too many arguments for %s", name));
11343788 188 return o;
79072805
LW		 189}
190
76e3520e 191STATIC void
6867be6d 192S_bad_type(pTHX_ I32 n, const char *t, const char *name, const OP *kid)
8990e307 193{
cea2e8a9 194 yyerror(Perl_form(aTHX_ "Type of arg %d to %s must be %s (not %s)",
53e06cf0 195 (int)n, name, t, OP_DESC(kid)));
8990e307
LW		 196}
197
7a52d87a 198STATIC void
6867be6d 199S_no_bareword_allowed(pTHX_ const OP *o)
7a52d87a 200{
5a844595 201 qerror(Perl_mess(aTHX_
35c1215d
NC		 202 "Bareword \"%"SVf"\" not allowed while \"strict subs\" in use",
203 cSVOPo_sv));
7a52d87a
GS		 204}
205
79072805
LW		 206/* "register" allocation */
207
208PADOFFSET
dd2155a4 209Perl_allocmy(pTHX_ char *name)
93a17b20 210{
a0d0e21e 211 PADOFFSET off;
a0d0e21e 212
59f00321 213 /* complain about "my $<special_var>" etc etc */
155aba94
GS		 214 if (!(PL_in_my == KEY_our ||
215 isALPHA(name[1]) ||
39e02b42 216 (USE_UTF8_IN_NAMES && UTF8_IS_START(name[1])) ||
59f00321 217 (name[1] == '_' && (*name == '$' || (int)strlen(name) > 2))))
834a4ddd 218 {
c4d0567e 219 if (!isPRINT(name[1]) || strchr("\t\n\r\f", name[1])) {
2b92dfce
GS		 220 /* 1999-02-27 mjd@plover.com */
221 char *p;
222 p = strchr(name, '\0');
223 /* The next block assumes the buffer is at least 205 chars
224 long. At present, it's always at least 256 chars. */
225 if (p-name > 200) {
226 strcpy(name+200, "...");
227 p = name+199;
228 }
229 else {
230 p[1] = '\0';
231 }
232 /* Move everything else down one character */
233 for (; p-name > 2; p--)
234 *p = *(p-1);
46fc3d4c 235 name[2] = toCTRL(name[1]);
236 name[1] = '^';
237 }
cea2e8a9 238 yyerror(Perl_form(aTHX_ "Can't use global %s in \"my\"",name));
a0d0e21e 239 }
748a9306 240
dd2155a4
DM		 241 /* check for duplicate declaration */
242 pad_check_dup(name,
c5661c80 243 (bool)(PL_in_my == KEY_our),
dd2155a4
DM		 244 (PL_curstash ? PL_curstash : PL_defstash)
245 );
33b8ce05 246
dd2155a4
DM		 247 if (PL_in_my_stash && *name != '$') {
248 yyerror(Perl_form(aTHX_
249 "Can't declare class for non-scalar %s in \"%s\"",
250 name, PL_in_my == KEY_our ? "our" : "my"));
6b35e009
GS		 251 }
252
dd2155a4 253 /* allocate a spare slot and store the name in that slot */
93a17b20 254
dd2155a4
DM		 255 off = pad_add_name(name,
256 PL_in_my_stash,
257 (PL_in_my == KEY_our
133706a6
RGS		 258 /* $_ is always in main::, even with our */
259 ? (PL_curstash && !strEQ(name,"$_") ? PL_curstash : PL_defstash)
dd2155a4
DM		 260 : Nullhv
261 ),
262 0 /* not fake */
263 );
264 return off;
79072805
LW		 265}
266
79072805
LW		 267/* Destructor */
268
269void
864dbfa3 270Perl_op_free(pTHX_ OP *o)
79072805 271{
27da23d5 272 dVAR;
acb36ea4 273 OPCODE type;
4026c95a 274 PADOFFSET refcnt;
79072805 275
2814eb74 276 if (!o || o->op_static)
79072805
LW		 277 return;
278
7934575e
GS		 279 if (o->op_private & OPpREFCOUNTED) {
280 switch (o->op_type) {
281 case OP_LEAVESUB:
282 case OP_LEAVESUBLV:
283 case OP_LEAVEEVAL:
284 case OP_LEAVE:
285 case OP_SCOPE:
286 case OP_LEAVEWRITE:
287 OP_REFCNT_LOCK;
4026c95a 288 refcnt = OpREFCNT_dec(o);
7934575e 289 OP_REFCNT_UNLOCK;
4026c95a
SH		 290 if (refcnt)
291 return;
7934575e
GS		 292 break;
293 default:
294 break;
295 }
296 }
297
11343788 298 if (o->op_flags & OPf_KIDS) {
6867be6d 299 register OP *kid, *nextkid;
11343788 300 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 301 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 302 op_free(kid);
85e6fe83 303 }
79072805 304 }
acb36ea4
GS		 305 type = o->op_type;
306 if (type == OP_NULL)
eb160463 307 type = (OPCODE)o->op_targ;
acb36ea4
GS		 308
309 /* COP* is not cleared by op_clear() so that we may track line
310 * numbers etc even after null() */
311 if (type == OP_NEXTSTATE || type == OP_SETSTATE || type == OP_DBSTATE)
312 cop_free((COP*)o);
313
314 op_clear(o);
238a4c30 315 FreeOp(o);
4d494880
DM		 316#ifdef DEBUG_LEAKING_SCALARS
317 if (PL_op == o)
318 PL_op = Nullop;
319#endif
acb36ea4 320}
79072805 321
93c66552
DM		 322void
323Perl_op_clear(pTHX_ OP *o)
acb36ea4 324{
13137afc 325
27da23d5 326 dVAR;
11343788 327 switch (o->op_type) {
acb36ea4
GS		 328 case OP_NULL: /* Was holding old type, if any. */
329 case OP_ENTEREVAL: /* Was holding hints. */
acb36ea4 330 o->op_targ = 0;
a0d0e21e 331 break;
a6006777 332 default:
ac4c12e7 333 if (!(o->op_flags & OPf_REF)
0b94c7bb 334 || (PL_check[o->op_type] != MEMBER_TO_FPTR(Perl_ck_ftst)))
a6006777 335 break;
336 /* FALL THROUGH */
463ee0b2 337 case OP_GVSV:
79072805 338 case OP_GV:
a6006777 339 case OP_AELEMFAST:
6a077020
DM		 340 if (! (o->op_type == OP_AELEMFAST && o->op_flags & OPf_SPECIAL)) {
341 /* not an OP_PADAV replacement */
350de78d 342#ifdef USE_ITHREADS
6a077020
DM		 343 if (cPADOPo->op_padix > 0) {
344 /* No GvIN_PAD_off(cGVOPo_gv) here, because other references
345 * may still exist on the pad */
346 pad_swipe(cPADOPo->op_padix, TRUE);
347 cPADOPo->op_padix = 0;
348 }
350de78d 349#else
6a077020
DM		 350 SvREFCNT_dec(cSVOPo->op_sv);
351 cSVOPo->op_sv = Nullsv;
350de78d 352#endif
6a077020 353 }
79072805 354 break;
a1ae71d2 355 case OP_METHOD_NAMED:
79072805 356 case OP_CONST:
11343788 357 SvREFCNT_dec(cSVOPo->op_sv);
acb36ea4 358 cSVOPo->op_sv = Nullsv;
3b1c21fa
AB		 359#ifdef USE_ITHREADS
360 /** Bug #15654
361 Even if op_clear does a pad_free for the target of the op,
6a077020 362 pad_free doesn't actually remove the sv that exists in the pad;
3b1c21fa
AB		 363 instead it lives on. This results in that it could be reused as
364 a target later on when the pad was reallocated.
365 **/
366 if(o->op_targ) {
367 pad_swipe(o->op_targ,1);
368 o->op_targ = 0;
369 }
370#endif
79072805 371 break;
748a9306
LW		 372 case OP_GOTO:
373 case OP_NEXT:
374 case OP_LAST:
375 case OP_REDO:
11343788 376 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 377 break;
378 /* FALL THROUGH */
a0d0e21e 379 case OP_TRANS:
acb36ea4 380 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
a0ed51b3 381 SvREFCNT_dec(cSVOPo->op_sv);
acb36ea4
GS		 382 cSVOPo->op_sv = Nullsv;
383 }
384 else {
a0ed51b3 385 Safefree(cPVOPo->op_pv);
acb36ea4
GS		 386 cPVOPo->op_pv = Nullch;
387 }
a0d0e21e
LW		 388 break;
389 case OP_SUBST:
11343788 390 op_free(cPMOPo->op_pmreplroot);
971a9dd3 391 goto clear_pmop;
748a9306 392 case OP_PUSHRE:
971a9dd3 393#ifdef USE_ITHREADS
ba89bb6e 394 if (INT2PTR(PADOFFSET, cPMOPo->op_pmreplroot)) {
dd2155a4
DM		 395 /* No GvIN_PAD_off here, because other references may still
396 * exist on the pad */
397 pad_swipe(INT2PTR(PADOFFSET, cPMOPo->op_pmreplroot), TRUE);
971a9dd3
GS		 398 }
399#else
400 SvREFCNT_dec((SV*)cPMOPo->op_pmreplroot);
401#endif
402 /* FALL THROUGH */
a0d0e21e 403 case OP_MATCH:
8782bef2 404 case OP_QR:
971a9dd3 405clear_pmop:
cb55de95
JH		 406 {
407 HV *pmstash = PmopSTASH(cPMOPo);
408 if (pmstash && SvREFCNT(pmstash)) {
8d2f4536
NC		 409 MAGIC *mg = mg_find((SV*)pmstash, PERL_MAGIC_symtab);
410 if (mg) {
411 PMOP *pmop = (PMOP*) mg->mg_obj;
412 PMOP *lastpmop = NULL;
413 while (pmop) {
414 if (cPMOPo == pmop) {
415 if (lastpmop)
416 lastpmop->op_pmnext = pmop->op_pmnext;
417 else
418 mg->mg_obj = (SV*) pmop->op_pmnext;
419 break;
420 }
421 lastpmop = pmop;
422 pmop = pmop->op_pmnext;
cb55de95 423 }
cb55de95 424 }
83da49e6 425 }
05ec9bb3 426 PmopSTASH_free(cPMOPo);
cb55de95 427 }
971a9dd3 428 cPMOPo->op_pmreplroot = Nullop;
5f8cb046
DM		 429 /* we use the "SAFE" version of the PM_ macros here
430 * since sv_clean_all might release some PMOPs
431 * after PL_regex_padav has been cleared
432 * and the clearing of PL_regex_padav needs to
433 * happen before sv_clean_all
434 */
435 ReREFCNT_dec(PM_GETRE_SAFE(cPMOPo));
436 PM_SETRE_SAFE(cPMOPo, (REGEXP*)NULL);
13137afc
AB		 437#ifdef USE_ITHREADS
438 if(PL_regex_pad) { /* We could be in destruction */
439 av_push((AV*) PL_regex_pad[0],(SV*) PL_regex_pad[(cPMOPo)->op_pmoffset]);
1cc8b4c5 440 SvREPADTMP_on(PL_regex_pad[(cPMOPo)->op_pmoffset]);
13137afc
AB		 441 PM_SETRE(cPMOPo, (cPMOPo)->op_pmoffset);
442 }
1eb1540c 443#endif
13137afc 444
a0d0e21e 445 break;
79072805
LW		 446 }
447
743e66e6 448 if (o->op_targ > 0) {
11343788 449 pad_free(o->op_targ);
743e66e6
GS		 450 o->op_targ = 0;
451 }
79072805
LW		 452}
453
76e3520e 454STATIC void
3eb57f73
HS		 455S_cop_free(pTHX_ COP* cop)
456{
05ec9bb3
NIS		 457 Safefree(cop->cop_label); /* FIXME: treaddead ??? */
458 CopFILE_free(cop);
459 CopSTASH_free(cop);
0453d815 460 if (! specialWARN(cop->cop_warnings))
3eb57f73 461 SvREFCNT_dec(cop->cop_warnings);
05ec9bb3
NIS		 462 if (! specialCopIO(cop->cop_io)) {
463#ifdef USE_ITHREADS
042f6df8 464#if 0
05ec9bb3
NIS		 465 STRLEN len;
466 char *s = SvPV(cop->cop_io,len);
b178108d
JH		 467 Perl_warn(aTHX_ "io='%.*s'",(int) len,s); /* ??? --jhi */
468#endif
05ec9bb3 469#else
ac27b0f5 470 SvREFCNT_dec(cop->cop_io);
05ec9bb3
NIS		 471#endif
472 }
3eb57f73
HS		 473}
474
93c66552
DM		 475void
476Perl_op_null(pTHX_ OP *o)
8990e307 477{
27da23d5 478 dVAR;
acb36ea4
GS		 479 if (o->op_type == OP_NULL)
480 return;
481 op_clear(o);
11343788
MB		 482 o->op_targ = o->op_type;
483 o->op_type = OP_NULL;
22c35a8c 484 o->op_ppaddr = PL_ppaddr[OP_NULL];
8990e307
LW		 485}
486
4026c95a
SH		 487void
488Perl_op_refcnt_lock(pTHX)
489{
27da23d5 490 dVAR;
4026c95a
SH		 491 OP_REFCNT_LOCK;
492}
493
494void
495Perl_op_refcnt_unlock(pTHX)
496{
27da23d5 497 dVAR;
4026c95a
SH		 498 OP_REFCNT_UNLOCK;
499}
500
79072805
LW		 501/* Contextualizers */
502
463ee0b2 503#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 504
505OP *
864dbfa3 506Perl_linklist(pTHX_ OP *o)
79072805 507{
79072805 508
11343788
MB		 509 if (o->op_next)
510 return o->op_next;
79072805
LW		 511
512 /* establish postfix order */
11343788 513 if (cUNOPo->op_first) {
6867be6d 514 register OP *kid;
11343788
MB		 515 o->op_next = LINKLIST(cUNOPo->op_first);
516 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 517 if (kid->op_sibling)
518 kid->op_next = LINKLIST(kid->op_sibling);
519 else
11343788 520 kid->op_next = o;
79072805
LW		 521 }
522 }
523 else
11343788 524 o->op_next = o;
79072805 525
11343788 526 return o->op_next;
79072805
LW		 527}
528
529OP *
864dbfa3 530Perl_scalarkids(pTHX_ OP *o)
79072805 531{
11343788 532 if (o && o->op_flags & OPf_KIDS) {
bfed75c6 533 OP *kid;
11343788 534 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 535 scalar(kid);
536 }
11343788 537 return o;
79072805
LW		 538}
539
76e3520e 540STATIC OP *
cea2e8a9 541S_scalarboolean(pTHX_ OP *o)
8990e307 542{
d008e5eb 543 if (o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
d008e5eb 544 if (ckWARN(WARN_SYNTAX)) {
6867be6d 545 const line_t oldline = CopLINE(PL_curcop);
a0d0e21e 546
d008e5eb 547 if (PL_copline != NOLINE)
57843af0 548 CopLINE_set(PL_curcop, PL_copline);
9014280d 549 Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "Found = in conditional, should be ==");
57843af0 550 CopLINE_set(PL_curcop, oldline);
d008e5eb 551 }
a0d0e21e 552 }
11343788 553 return scalar(o);
8990e307
LW		 554}
555
556OP *
864dbfa3 557Perl_scalar(pTHX_ OP *o)
79072805 558{
27da23d5 559 dVAR;
79072805
LW		 560 OP *kid;
561
a0d0e21e 562 /* assumes no premature commitment */
3280af22 563 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 564 || o->op_type == OP_RETURN)
7e363e51 565 {
11343788 566 return o;
7e363e51 567 }
79072805 568
5dc0d613 569 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 570
11343788 571 switch (o->op_type) {
79072805 572 case OP_REPEAT:
11343788 573 scalar(cBINOPo->op_first);
8990e307 574 break;
79072805
LW		 575 case OP_OR:
576 case OP_AND:
577 case OP_COND_EXPR:
11343788 578 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 579 scalar(kid);
79072805 580 break;
a0d0e21e 581 case OP_SPLIT:
11343788 582 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e 583 if (!kPMOP->op_pmreplroot)
12bcd1a6 584 deprecate_old("implicit split to @_");
a0d0e21e
LW		 585 }
586 /* FALL THROUGH */
79072805 587 case OP_MATCH:
8782bef2 588 case OP_QR:
79072805
LW		 589 case OP_SUBST:
590 case OP_NULL:
8990e307 591 default:
11343788
MB		 592 if (o->op_flags & OPf_KIDS) {
593 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 594 scalar(kid);
595 }
79072805
LW		 596 break;
597 case OP_LEAVE:
598 case OP_LEAVETRY:
5dc0d613 599 kid = cLISTOPo->op_first;
54310121 600 scalar(kid);
155aba94 601 while ((kid = kid->op_sibling)) {
54310121 602 if (kid->op_sibling)
603 scalarvoid(kid);
604 else
605 scalar(kid);
606 }
3280af22 607 WITH_THR(PL_curcop = &PL_compiling);
54310121 608 break;
748a9306 609 case OP_SCOPE:
79072805 610 case OP_LINESEQ:
8990e307 611 case OP_LIST:
11343788 612 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 613 if (kid->op_sibling)
614 scalarvoid(kid);
615 else
616 scalar(kid);
617 }
3280af22 618 WITH_THR(PL_curcop = &PL_compiling);
79072805 619 break;
a801c63c
RGS		 620 case OP_SORT:
621 if (ckWARN(WARN_VOID))
9014280d 622 Perl_warner(aTHX_ packWARN(WARN_VOID), "Useless use of sort in scalar context");
79072805 623 }
11343788 624 return o;
79072805
LW		 625}
626
627OP *
864dbfa3 628Perl_scalarvoid(pTHX_ OP *o)
79072805 629{
27da23d5 630 dVAR;
79072805 631 OP *kid;
e1ec3a88 632 const char* useless = 0;
8990e307 633 SV* sv;
2ebea0a1
GS		 634 U8 want;
635
acb36ea4
GS		 636 if (o->op_type == OP_NEXTSTATE
637 || o->op_type == OP_SETSTATE
638 || o->op_type == OP_DBSTATE
639 || (o->op_type == OP_NULL && (o->op_targ == OP_NEXTSTATE
640 || o->op_targ == OP_SETSTATE
641 || o->op_targ == OP_DBSTATE)))
2ebea0a1 642 PL_curcop = (COP*)o; /* for warning below */
79072805 643
54310121 644 /* assumes no premature commitment */
2ebea0a1
GS		 645 want = o->op_flags & OPf_WANT;
646 if ((want && want != OPf_WANT_SCALAR) || PL_error_count
5dc0d613 647 || o->op_type == OP_RETURN)
7e363e51 648 {
11343788 649 return o;
7e363e51 650 }
79072805 651
b162f9ea 652 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 653 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
654 {
b162f9ea 655 return scalar(o); /* As if inside SASSIGN */
7e363e51 656 }
1c846c1f 657
5dc0d613 658 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 659
11343788 660 switch (o->op_type) {
79072805 661 default:
22c35a8c 662 if (!(PL_opargs[o->op_type] & OA_FOLDCONST))
8990e307 663 break;
36477c24 664 /* FALL THROUGH */
665 case OP_REPEAT:
11343788 666 if (o->op_flags & OPf_STACKED)
8990e307 667 break;
5d82c453
GA		 668 goto func_ops;
669 case OP_SUBSTR:
670 if (o->op_private == 4)
671 break;
8990e307
LW		 672 /* FALL THROUGH */
673 case OP_GVSV:
674 case OP_WANTARRAY:
675 case OP_GV:
676 case OP_PADSV:
677 case OP_PADAV:
678 case OP_PADHV:
679 case OP_PADANY:
680 case OP_AV2ARYLEN:
8990e307 681 case OP_REF:
a0d0e21e
LW		 682 case OP_REFGEN:
683 case OP_SREFGEN:
8990e307
LW		 684 case OP_DEFINED:
685 case OP_HEX:
686 case OP_OCT:
687 case OP_LENGTH:
8990e307
LW		 688 case OP_VEC:
689 case OP_INDEX:
690 case OP_RINDEX:
691 case OP_SPRINTF:
692 case OP_AELEM:
693 case OP_AELEMFAST:
694 case OP_ASLICE:
8990e307
LW		 695 case OP_HELEM:
696 case OP_HSLICE:
697 case OP_UNPACK:
698 case OP_PACK:
8990e307
LW		 699 case OP_JOIN:
700 case OP_LSLICE:
701 case OP_ANONLIST:
702 case OP_ANONHASH:
703 case OP_SORT:
704 case OP_REVERSE:
705 case OP_RANGE:
706 case OP_FLIP:
707 case OP_FLOP:
708 case OP_CALLER:
709 case OP_FILENO:
710 case OP_EOF:
711 case OP_TELL:
712 case OP_GETSOCKNAME:
713 case OP_GETPEERNAME:
714 case OP_READLINK:
715 case OP_TELLDIR:
716 case OP_GETPPID:
717 case OP_GETPGRP:
718 case OP_GETPRIORITY:
719 case OP_TIME:
720 case OP_TMS:
721 case OP_LOCALTIME:
722 case OP_GMTIME:
723 case OP_GHBYNAME:
724 case OP_GHBYADDR:
725 case OP_GHOSTENT:
726 case OP_GNBYNAME:
727 case OP_GNBYADDR:
728 case OP_GNETENT:
729 case OP_GPBYNAME:
730 case OP_GPBYNUMBER:
731 case OP_GPROTOENT:
732 case OP_GSBYNAME:
733 case OP_GSBYPORT:
734 case OP_GSERVENT:
735 case OP_GPWNAM:
736 case OP_GPWUID:
737 case OP_GGRNAM:
738 case OP_GGRGID:
739 case OP_GETLOGIN:
78e1b766 740 case OP_PROTOTYPE:
5d82c453 741 func_ops:
64aac5a9 742 if (!(o->op_private & (OPpLVAL_INTRO|OPpOUR_INTRO)))
53e06cf0 743 useless = OP_DESC(o);
8990e307
LW		 744 break;
745
9f82cd5f
YST		 746 case OP_NOT:
747 kid = cUNOPo->op_first;
748 if (kid->op_type != OP_MATCH && kid->op_type != OP_SUBST &&
749 kid->op_type != OP_TRANS) {
750 goto func_ops;
751 }
752 useless = "negative pattern binding (!~)";
753 break;
754
8990e307
LW		 755 case OP_RV2GV:
756 case OP_RV2SV:
757 case OP_RV2AV:
758 case OP_RV2HV:
192587c2 759 if (!(o->op_private & (OPpLVAL_INTRO|OPpOUR_INTRO)) &&
11343788 760 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 761 useless = "a variable";
762 break;
79072805
LW		 763
764 case OP_CONST:
7766f137 765 sv = cSVOPo_sv;
7a52d87a
GS		 766 if (cSVOPo->op_private & OPpCONST_STRICT)
767 no_bareword_allowed(o);
768 else {
d008e5eb
GS		 769 if (ckWARN(WARN_VOID)) {
770 useless = "a constant";
e7fec78e 771 /* don't warn on optimised away booleans, eg
b5a930ec 772 * use constant Foo, 5; Foo || print; */
e7fec78e
DM		 773 if (cSVOPo->op_private & OPpCONST_SHORTCIRCUIT)
774 useless = 0;
960b4253
MG		 775 /* the constants 0 and 1 are permitted as they are
776 conventionally used as dummies in constructs like
777 1 while some_condition_with_side_effects; */
e7fec78e 778 else if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
d008e5eb
GS		 779 useless = 0;
780 else if (SvPOK(sv)) {
a52fe3ac
A		 781 /* perl4's way of mixing documentation and code
782 (before the invention of POD) was based on a
783 trick to mix nroff and perl code. The trick was
784 built upon these three nroff macros being used in
785 void context. The pink camel has the details in
786 the script wrapman near page 319. */
b15aece3
SP		 787 if (strnEQ(SvPVX_const(sv), "di", 2) ||
788 strnEQ(SvPVX_const(sv), "ds", 2) ||
789 strnEQ(SvPVX_const(sv), "ig", 2))
d008e5eb
GS		 790 useless = 0;
791 }
8990e307
LW		 792 }
793 }
93c66552 794 op_null(o); /* don't execute or even remember it */
79072805
LW		 795 break;
796
797 case OP_POSTINC:
11343788 798 o->op_type = OP_PREINC; /* pre-increment is faster */
22c35a8c 799 o->op_ppaddr = PL_ppaddr[OP_PREINC];
79072805
LW		 800 break;
801
802 case OP_POSTDEC:
11343788 803 o->op_type = OP_PREDEC; /* pre-decrement is faster */
22c35a8c 804 o->op_ppaddr = PL_ppaddr[OP_PREDEC];
79072805
LW		 805 break;
806
79072805
LW		 807 case OP_OR:
808 case OP_AND:
c963b151 809 case OP_DOR:
79072805 810 case OP_COND_EXPR:
11343788 811 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 812 scalarvoid(kid);
813 break;
5aabfad6 814
a0d0e21e 815 case OP_NULL:
11343788 816 if (o->op_flags & OPf_STACKED)
a0d0e21e 817 break;
5aabfad6 818 /* FALL THROUGH */
2ebea0a1
GS		 819 case OP_NEXTSTATE:
820 case OP_DBSTATE:
79072805
LW		 821 case OP_ENTERTRY:
822 case OP_ENTER:
11343788 823 if (!(o->op_flags & OPf_KIDS))
79072805 824 break;
54310121 825 /* FALL THROUGH */
463ee0b2 826 case OP_SCOPE:
79072805
LW		 827 case OP_LEAVE:
828 case OP_LEAVETRY:
a0d0e21e 829 case OP_LEAVELOOP:
79072805 830 case OP_LINESEQ:
79072805 831 case OP_LIST:
11343788 832 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 833 scalarvoid(kid);
834 break;
c90c0ff4 835 case OP_ENTEREVAL:
5196be3e 836 scalarkids(o);
c90c0ff4 837 break;
5aabfad6 838 case OP_REQUIRE:
c90c0ff4 839 /* all requires must return a boolean value */
5196be3e 840 o->op_flags &= ~OPf_WANT;
d6483035
GS		 841 /* FALL THROUGH */
842 case OP_SCALAR:
5196be3e 843 return scalar(o);
a0d0e21e 844 case OP_SPLIT:
11343788 845 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e 846 if (!kPMOP->op_pmreplroot)
12bcd1a6 847 deprecate_old("implicit split to @_");
a0d0e21e
LW		 848 }
849 break;
79072805 850 }
411caa50 851 if (useless && ckWARN(WARN_VOID))
9014280d 852 Perl_warner(aTHX_ packWARN(WARN_VOID), "Useless use of %s in void context", useless);
11343788 853 return o;
79072805
LW		 854}
855
856OP *
864dbfa3 857Perl_listkids(pTHX_ OP *o)
79072805 858{
11343788 859 if (o && o->op_flags & OPf_KIDS) {
6867be6d 860 OP *kid;
11343788 861 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 862 list(kid);
863 }
11343788 864 return o;
79072805
LW		 865}
866
867OP *
864dbfa3 868Perl_list(pTHX_ OP *o)
79072805 869{
27da23d5 870 dVAR;
79072805
LW		 871 OP *kid;
872
a0d0e21e 873 /* assumes no premature commitment */
3280af22 874 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 875 || o->op_type == OP_RETURN)
7e363e51 876 {
11343788 877 return o;
7e363e51 878 }
79072805 879
b162f9ea 880 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 881 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
882 {
b162f9ea 883 return o; /* As if inside SASSIGN */
7e363e51 884 }
1c846c1f 885
5dc0d613 886 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 887
11343788 888 switch (o->op_type) {
79072805
LW		 889 case OP_FLOP:
890 case OP_REPEAT:
11343788 891 list(cBINOPo->op_first);
79072805
LW		 892 break;
893 case OP_OR:
894 case OP_AND:
895 case OP_COND_EXPR:
11343788 896 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 897 list(kid);
898 break;
899 default:
900 case OP_MATCH:
8782bef2 901 case OP_QR:
79072805
LW		 902 case OP_SUBST:
903 case OP_NULL:
11343788 904 if (!(o->op_flags & OPf_KIDS))
79072805 905 break;
11343788
MB		 906 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
907 list(cBINOPo->op_first);
908 return gen_constant_list(o);
79072805
LW		 909 }
910 case OP_LIST:
11343788 911 listkids(o);
79072805
LW		 912 break;
913 case OP_LEAVE:
914 case OP_LEAVETRY:
5dc0d613 915 kid = cLISTOPo->op_first;
54310121 916 list(kid);
155aba94 917 while ((kid = kid->op_sibling)) {
54310121 918 if (kid->op_sibling)
919 scalarvoid(kid);
920 else
921 list(kid);
922 }
3280af22 923 WITH_THR(PL_curcop = &PL_compiling);
54310121 924 break;
748a9306 925 case OP_SCOPE:
79072805 926 case OP_LINESEQ:
11343788 927 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 928 if (kid->op_sibling)
929 scalarvoid(kid);
930 else
931 list(kid);
932 }
3280af22 933 WITH_THR(PL_curcop = &PL_compiling);
79072805 934 break;
c90c0ff4 935 case OP_REQUIRE:
936 /* all requires must return a boolean value */
5196be3e
MB		 937 o->op_flags &= ~OPf_WANT;
938 return scalar(o);
79072805 939 }
11343788 940 return o;
79072805
LW		 941}
942
943OP *
864dbfa3 944Perl_scalarseq(pTHX_ OP *o)
79072805 945{
11343788
MB		 946 if (o) {
947 if (o->op_type == OP_LINESEQ ||
948 o->op_type == OP_SCOPE ||
949 o->op_type == OP_LEAVE ||
950 o->op_type == OP_LEAVETRY)
463ee0b2 951 {
6867be6d 952 OP *kid;
11343788 953 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 954 if (kid->op_sibling) {
463ee0b2 955 scalarvoid(kid);
ed6116ce 956 }
463ee0b2 957 }
3280af22 958 PL_curcop = &PL_compiling;
79072805 959 }
11343788 960 o->op_flags &= ~OPf_PARENS;
3280af22 961 if (PL_hints & HINT_BLOCK_SCOPE)
11343788 962 o->op_flags |= OPf_PARENS;
79072805 963 }
8990e307 964 else
11343788
MB		 965 o = newOP(OP_STUB, 0);
966 return o;
79072805
LW		 967}
968
76e3520e 969STATIC OP *
cea2e8a9 970S_modkids(pTHX_ OP *o, I32 type)
79072805 971{
11343788 972 if (o && o->op_flags & OPf_KIDS) {
6867be6d 973 OP *kid;
11343788 974 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 975 mod(kid, type);
79072805 976 }
11343788 977 return o;
79072805
LW		 978}
979
ddeae0f1
DM		 980/* Propagate lvalue ("modifiable") context to an op and it's children.
981 * 'type' represents the context type, roughly based on the type of op that
982 * would do the modifying, although local() is represented by OP_NULL.
983 * It's responsible for detecting things that can't be modified, flag
984 * things that need to behave specially in an lvalue context (e.g., "$$x = 5"
985 * might have to vivify a reference in $x), and so on.
986 *
987 * For example, "$a+1 = 2" would cause mod() to be called with o being
988 * OP_ADD and type being OP_SASSIGN, and would output an error.
989 */
990
79072805 991OP *
864dbfa3 992Perl_mod(pTHX_ OP *o, I32 type)
79072805 993{
27da23d5 994 dVAR;
79072805 995 OP *kid;
ddeae0f1
DM		 996 /* -1 = error on localize, 0 = ignore localize, 1 = ok to localize */
997 int localize = -1;
79072805 998
3280af22 999 if (!o || PL_error_count)
11343788 1000 return o;
79072805 1001
b162f9ea 1002 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 1003 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
1004 {
b162f9ea 1005 return o;
7e363e51 1006 }
1c846c1f 1007
11343788 1008 switch (o->op_type) {
68dc0745 1009 case OP_UNDEF:
ddeae0f1 1010 localize = 0;
3280af22 1011 PL_modcount++;
5dc0d613 1012 return o;
a0d0e21e 1013 case OP_CONST:
11343788 1014 if (!(o->op_private & (OPpCONST_ARYBASE)))
a0d0e21e 1015 goto nomod;
3280af22 1016 if (PL_eval_start && PL_eval_start->op_type == OP_CONST) {
7766f137 1017 PL_compiling.cop_arybase = (I32)SvIV(cSVOPx(PL_eval_start)->op_sv);
3280af22 1018 PL_eval_start = 0;
a0d0e21e
LW		 1019 }
1020 else if (!type) {
3280af22
NIS		 1021 SAVEI32(PL_compiling.cop_arybase);
1022 PL_compiling.cop_arybase = 0;
a0d0e21e
LW		 1023 }
1024 else if (type == OP_REFGEN)
1025 goto nomod;
1026 else
cea2e8a9 1027 Perl_croak(aTHX_ "That use of $[ is unsupported");
a0d0e21e 1028 break;
5f05dabc 1029 case OP_STUB:
5196be3e 1030 if (o->op_flags & OPf_PARENS)
5f05dabc 1031 break;
1032 goto nomod;
a0d0e21e
LW		 1033 case OP_ENTERSUB:
1034 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1035 !(o->op_flags & OPf_STACKED)) {
1036 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1037 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788 1038 assert(cUNOPo->op_first->op_type == OP_NULL);
93c66552 1039 op_null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1040 break;
1041 }
95f0a2f1
SB		 1042 else if (o->op_private & OPpENTERSUB_NOMOD)
1043 return o;
cd06dffe
GS		 1044 else { /* lvalue subroutine call */
1045 o->op_private |= OPpLVAL_INTRO;
e6438c1a 1046 PL_modcount = RETURN_UNLIMITED_NUMBER;
4978d6d9 1047 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN) {
cd06dffe
GS		 1048 /* Backward compatibility mode: */
1049 o->op_private |= OPpENTERSUB_INARGS;
1050 break;
1051 }
1052 else { /* Compile-time error message: */
1053 OP *kid = cUNOPo->op_first;
1054 CV *cv;
1055 OP *okid;
1056
1057 if (kid->op_type == OP_PUSHMARK)
1058 goto skip_kids;
1059 if (kid->op_type != OP_NULL || kid->op_targ != OP_LIST)
1060 Perl_croak(aTHX_
1061 "panic: unexpected lvalue entersub "
55140b79 1062 "args: type/targ %ld:%"UVuf,
3d811634 1063 (long)kid->op_type, (UV)kid->op_targ);
cd06dffe
GS		 1064 kid = kLISTOP->op_first;
1065 skip_kids:
1066 while (kid->op_sibling)
1067 kid = kid->op_sibling;
1068 if (!(kid->op_type == OP_NULL && kid->op_targ == OP_RV2CV)) {
1069 /* Indirect call */
1070 if (kid->op_type == OP_METHOD_NAMED
1071 || kid->op_type == OP_METHOD)
1072 {
87d7fd28 1073 UNOP *newop;
b2ffa427 1074
87d7fd28 1075 NewOp(1101, newop, 1, UNOP);
349fd7b7
GS		 1076 newop->op_type = OP_RV2CV;
1077 newop->op_ppaddr = PL_ppaddr[OP_RV2CV];
87d7fd28
GS		 1078 newop->op_first = Nullop;
1079 newop->op_next = (OP*)newop;
1080 kid->op_sibling = (OP*)newop;
349fd7b7 1081 newop->op_private |= OPpLVAL_INTRO;
cd06dffe
GS		 1082 break;
1083 }
b2ffa427 1084
cd06dffe
GS		 1085 if (kid->op_type != OP_RV2CV)
1086 Perl_croak(aTHX_
1087 "panic: unexpected lvalue entersub "
55140b79 1088 "entry via type/targ %ld:%"UVuf,
3d811634 1089 (long)kid->op_type, (UV)kid->op_targ);
cd06dffe
GS		 1090 kid->op_private |= OPpLVAL_INTRO;
1091 break; /* Postpone until runtime */
1092 }
b2ffa427
NIS		 1093
1094 okid = kid;
cd06dffe
GS		 1095 kid = kUNOP->op_first;
1096 if (kid->op_type == OP_NULL && kid->op_targ == OP_RV2SV)
1097 kid = kUNOP->op_first;
b2ffa427 1098 if (kid->op_type == OP_NULL)
cd06dffe
GS		 1099 Perl_croak(aTHX_
1100 "Unexpected constant lvalue entersub "
55140b79 1101 "entry via type/targ %ld:%"UVuf,
3d811634 1102 (long)kid->op_type, (UV)kid->op_targ);
cd06dffe
GS		 1103 if (kid->op_type != OP_GV) {
1104 /* Restore RV2CV to check lvalueness */
1105 restore_2cv:
1106 if (kid->op_next && kid->op_next != kid) { /* Happens? */
1107 okid->op_next = kid->op_next;
1108 kid->op_next = okid;
1109 }
1110 else
1111 okid->op_next = Nullop;
1112 okid->op_type = OP_RV2CV;
1113 okid->op_targ = 0;
1114 okid->op_ppaddr = PL_ppaddr[OP_RV2CV];
1115 okid->op_private |= OPpLVAL_INTRO;
1116 break;
1117 }
b2ffa427 1118
638eceb6 1119 cv = GvCV(kGVOP_gv);
1c846c1f 1120 if (!cv)
cd06dffe
GS		 1121 goto restore_2cv;
1122 if (CvLVALUE(cv))
1123 break;
1124 }
1125 }
79072805
LW		 1126 /* FALL THROUGH */
1127 default:
a0d0e21e
LW		 1128 nomod:
1129 /* grep, foreach, subcalls, refgen */
1130 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
1131 break;
cea2e8a9 1132 yyerror(Perl_form(aTHX_ "Can't modify %s in %s",
638bc118 1133 (o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL)
cd06dffe
GS		 1134 ? "do block"
1135 : (o->op_type == OP_ENTERSUB
1136 ? "non-lvalue subroutine call"
53e06cf0 1137 : OP_DESC(o))),
22c35a8c 1138 type ? PL_op_desc[type] : "local"));
11343788 1139 return o;
79072805 1140
a0d0e21e
LW		 1141 case OP_PREINC:
1142 case OP_PREDEC:
1143 case OP_POW:
1144 case OP_MULTIPLY:
1145 case OP_DIVIDE:
1146 case OP_MODULO:
1147 case OP_REPEAT:
1148 case OP_ADD:
1149 case OP_SUBTRACT:
1150 case OP_CONCAT:
1151 case OP_LEFT_SHIFT:
1152 case OP_RIGHT_SHIFT:
1153 case OP_BIT_AND:
1154 case OP_BIT_XOR:
1155 case OP_BIT_OR:
1156 case OP_I_MULTIPLY:
1157 case OP_I_DIVIDE:
1158 case OP_I_MODULO:
1159 case OP_I_ADD:
1160 case OP_I_SUBTRACT:
11343788 1161 if (!(o->op_flags & OPf_STACKED))
a0d0e21e 1162 goto nomod;
3280af22 1163 PL_modcount++;
a0d0e21e 1164 break;
b2ffa427 1165
79072805 1166 case OP_COND_EXPR:
ddeae0f1 1167 localize = 1;
11343788 1168 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1169 mod(kid, type);
79072805
LW		 1170 break;
1171
1172 case OP_RV2AV:
1173 case OP_RV2HV:
11343788 1174 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
e6438c1a 1175 PL_modcount = RETURN_UNLIMITED_NUMBER;
11343788 1176 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1177 }
1178 /* FALL THROUGH */
79072805 1179 case OP_RV2GV:
5dc0d613 1180 if (scalar_mod_type(o, type))
3fe9a6f1 1181 goto nomod;
11343788 1182 ref(cUNOPo->op_first, o->op_type);
79072805 1183 /* FALL THROUGH */
79072805
LW		 1184 case OP_ASLICE:
1185 case OP_HSLICE:
78f9721b
SM		 1186 if (type == OP_LEAVESUBLV)
1187 o->op_private |= OPpMAYBE_LVSUB;
ddeae0f1 1188 localize = 1;
78f9721b
SM		 1189 /* FALL THROUGH */
1190 case OP_AASSIGN:
93a17b20
LW		 1191 case OP_NEXTSTATE:
1192 case OP_DBSTATE:
e6438c1a 1193 PL_modcount = RETURN_UNLIMITED_NUMBER;
79072805 1194 break;
463ee0b2 1195 case OP_RV2SV:
aeea060c 1196 ref(cUNOPo->op_first, o->op_type);
ddeae0f1 1197 localize = 1;
463ee0b2 1198 /* FALL THROUGH */
79072805 1199 case OP_GV:
463ee0b2 1200 case OP_AV2ARYLEN:
3280af22 1201 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1202 case OP_SASSIGN:
bf4b1e52
GS		 1203 case OP_ANDASSIGN:
1204 case OP_ORASSIGN:
c963b151 1205 case OP_DORASSIGN:
ddeae0f1
DM		 1206 PL_modcount++;
1207 break;
1208
8990e307 1209 case OP_AELEMFAST:
6a077020 1210 localize = -1;
3280af22 1211 PL_modcount++;
8990e307
LW		 1212 break;
1213
748a9306
LW		 1214 case OP_PADAV:
1215 case OP_PADHV:
e6438c1a 1216 PL_modcount = RETURN_UNLIMITED_NUMBER;
5196be3e
MB		 1217 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1218 return o; /* Treat \(@foo) like ordinary list. */
1219 if (scalar_mod_type(o, type))
3fe9a6f1 1220 goto nomod;
78f9721b
SM		 1221 if (type == OP_LEAVESUBLV)
1222 o->op_private |= OPpMAYBE_LVSUB;
748a9306
LW		 1223 /* FALL THROUGH */
1224 case OP_PADSV:
3280af22 1225 PL_modcount++;
ddeae0f1 1226 if (!type) /* local() */
cea2e8a9 1227 Perl_croak(aTHX_ "Can't localize lexical variable %s",
dd2155a4 1228 PAD_COMPNAME_PV(o->op_targ));
463ee0b2
LW		 1229 break;
1230
748a9306 1231 case OP_PUSHMARK:
ddeae0f1 1232 localize = 0;
748a9306 1233 break;
b2ffa427 1234
69969c6f
SB		 1235 case OP_KEYS:
1236 if (type != OP_SASSIGN)
1237 goto nomod;
5d82c453
GA		 1238 goto lvalue_func;
1239 case OP_SUBSTR:
1240 if (o->op_private == 4) /* don't allow 4 arg substr as lvalue */
1241 goto nomod;
5f05dabc 1242 /* FALL THROUGH */
a0d0e21e 1243 case OP_POS:
463ee0b2 1244 case OP_VEC:
78f9721b
SM		 1245 if (type == OP_LEAVESUBLV)
1246 o->op_private |= OPpMAYBE_LVSUB;
5d82c453 1247 lvalue_func:
11343788
MB		 1248 pad_free(o->op_targ);
1249 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1250 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1251 if (o->op_flags & OPf_KIDS)
1252 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1253 break;
a0d0e21e 1254
463ee0b2
LW		 1255 case OP_AELEM:
1256 case OP_HELEM:
11343788 1257 ref(cBINOPo->op_first, o->op_type);
68dc0745 1258 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1259 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1260 o->op_private |= OPpLVAL_DEFER;
78f9721b
SM		 1261 if (type == OP_LEAVESUBLV)
1262 o->op_private |= OPpMAYBE_LVSUB;
ddeae0f1 1263 localize = 1;
3280af22 1264 PL_modcount++;
463ee0b2
LW		 1265 break;
1266
1267 case OP_SCOPE:
1268 case OP_LEAVE:
1269 case OP_ENTER:
78f9721b 1270 case OP_LINESEQ:
ddeae0f1 1271 localize = 0;
11343788
MB		 1272 if (o->op_flags & OPf_KIDS)
1273 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1274 break;
1275
1276 case OP_NULL:
ddeae0f1 1277 localize = 0;
638bc118
GS		 1278 if (o->op_flags & OPf_SPECIAL) /* do BLOCK */
1279 goto nomod;
1280 else if (!(o->op_flags & OPf_KIDS))
463ee0b2 1281 break;
11343788
MB		 1282 if (o->op_targ != OP_LIST) {
1283 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1284 break;
1285 }
1286 /* FALL THROUGH */
463ee0b2 1287 case OP_LIST:
ddeae0f1 1288 localize = 0;
11343788 1289 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1290 mod(kid, type);
1291 break;
78f9721b
SM		 1292
1293 case OP_RETURN:
1294 if (type != OP_LEAVESUBLV)
1295 goto nomod;
1296 break; /* mod()ing was handled by ck_return() */
463ee0b2 1297 }
58d95175 1298
8be1be90
AMS		 1299 /* [20011101.069] File test operators interpret OPf_REF to mean that
1300 their argument is a filehandle; thus \stat(".") should not set
1301 it. AMS 20011102 */
1302 if (type == OP_REFGEN &&
1303 PL_check[o->op_type] == MEMBER_TO_FPTR(Perl_ck_ftst))
1304 return o;
1305
1306 if (type != OP_LEAVESUBLV)
1307 o->op_flags |= OPf_MOD;
1308
1309 if (type == OP_AASSIGN || type == OP_SASSIGN)
1310 o->op_flags |= OPf_SPECIAL|OPf_REF;
ddeae0f1
DM		 1311 else if (!type) { /* local() */
1312 switch (localize) {
1313 case 1:
1314 o->op_private |= OPpLVAL_INTRO;
1315 o->op_flags &= ~OPf_SPECIAL;
1316 PL_hints |= HINT_BLOCK_SCOPE;
1317 break;
1318 case 0:
1319 break;
1320 case -1:
1321 if (ckWARN(WARN_SYNTAX)) {
1322 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
1323 "Useless localization of %s", OP_DESC(o));
1324 }
1325 }
463ee0b2 1326 }
8be1be90
AMS		 1327 else if (type != OP_GREPSTART && type != OP_ENTERSUB
1328 && type != OP_LEAVESUBLV)
1329 o->op_flags |= OPf_REF;
11343788 1330 return o;
463ee0b2
LW		 1331}
1332
864dbfa3 1333STATIC bool
6867be6d 1334S_scalar_mod_type(pTHX_ const OP *o, I32 type)
3fe9a6f1 1335{
1336 switch (type) {
1337 case OP_SASSIGN:
5196be3e 1338 if (o->op_type == OP_RV2GV)
3fe9a6f1 1339 return FALSE;
1340 /* FALL THROUGH */
1341 case OP_PREINC:
1342 case OP_PREDEC:
1343 case OP_POSTINC:
1344 case OP_POSTDEC:
1345 case OP_I_PREINC:
1346 case OP_I_PREDEC:
1347 case OP_I_POSTINC:
1348 case OP_I_POSTDEC:
1349 case OP_POW:
1350 case OP_MULTIPLY:
1351 case OP_DIVIDE:
1352 case OP_MODULO:
1353 case OP_REPEAT:
1354 case OP_ADD:
1355 case OP_SUBTRACT:
1356 case OP_I_MULTIPLY:
1357 case OP_I_DIVIDE:
1358 case OP_I_MODULO:
1359 case OP_I_ADD:
1360 case OP_I_SUBTRACT:
1361 case OP_LEFT_SHIFT:
1362 case OP_RIGHT_SHIFT:
1363 case OP_BIT_AND:
1364 case OP_BIT_XOR:
1365 case OP_BIT_OR:
1366 case OP_CONCAT:
1367 case OP_SUBST:
1368 case OP_TRANS:
49e9fbe6
GS		 1369 case OP_READ:
1370 case OP_SYSREAD:
1371 case OP_RECV:
bf4b1e52
GS		 1372 case OP_ANDASSIGN:
1373 case OP_ORASSIGN:
3fe9a6f1 1374 return TRUE;
1375 default:
1376 return FALSE;
1377 }
1378}
1379
35cd451c 1380STATIC bool
504618e9 1381S_is_handle_constructor(pTHX_ const OP *o, I32 numargs)
35cd451c
GS		 1382{
1383 switch (o->op_type) {
1384 case OP_PIPE_OP:
1385 case OP_SOCKPAIR:
504618e9 1386 if (numargs == 2)
35cd451c
GS		 1387 return TRUE;
1388 /* FALL THROUGH */
1389 case OP_SYSOPEN:
1390 case OP_OPEN:
ded8aa31 1391 case OP_SELECT: /* XXX c.f. SelectSaver.pm */
35cd451c
GS		 1392 case OP_SOCKET:
1393 case OP_OPEN_DIR:
1394 case OP_ACCEPT:
504618e9 1395 if (numargs == 1)
35cd451c
GS		 1396 return TRUE;
1397 /* FALL THROUGH */
1398 default:
1399 return FALSE;
1400 }
1401}
1402
463ee0b2 1403OP *
864dbfa3 1404Perl_refkids(pTHX_ OP *o, I32 type)
463ee0b2 1405{
11343788 1406 if (o && o->op_flags & OPf_KIDS) {
6867be6d 1407 OP *kid;
11343788 1408 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1409 ref(kid, type);
1410 }
11343788 1411 return o;
463ee0b2
LW		 1412}
1413
1414OP *
864dbfa3 1415Perl_ref(pTHX_ OP *o, I32 type)
463ee0b2 1416{
27da23d5 1417 dVAR;
463ee0b2 1418 OP *kid;
463ee0b2 1419
3280af22 1420 if (!o || PL_error_count)
11343788 1421 return o;
463ee0b2 1422
11343788 1423 switch (o->op_type) {
a0d0e21e 1424 case OP_ENTERSUB:
afebc493 1425 if ((type == OP_EXISTS || type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1426 !(o->op_flags & OPf_STACKED)) {
1427 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1428 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788 1429 assert(cUNOPo->op_first->op_type == OP_NULL);
93c66552 1430 op_null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
11343788 1431 o->op_flags |= OPf_SPECIAL;
8990e307
LW		 1432 }
1433 break;
aeea060c 1434
463ee0b2 1435 case OP_COND_EXPR:
11343788 1436 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2
LW		 1437 ref(kid, type);
1438 break;
8990e307 1439 case OP_RV2SV:
35cd451c
GS		 1440 if (type == OP_DEFINED)
1441 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1442 ref(cUNOPo->op_first, o->op_type);
4633a7c4
LW		 1443 /* FALL THROUGH */
1444 case OP_PADSV:
5f05dabc 1445 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1446 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1447 : type == OP_RV2HV ? OPpDEREF_HV
1448 : OPpDEREF_SV);
11343788 1449 o->op_flags |= OPf_MOD;
a0d0e21e 1450 }
8990e307 1451 break;
1c846c1f 1452
2faa37cc 1453 case OP_THREADSV:
a863c7d1
MB		 1454 o->op_flags |= OPf_MOD; /* XXX ??? */
1455 break;
1456
463ee0b2
LW		 1457 case OP_RV2AV:
1458 case OP_RV2HV:
aeea060c 1459 o->op_flags |= OPf_REF;
8990e307 1460 /* FALL THROUGH */
463ee0b2 1461 case OP_RV2GV:
35cd451c
GS		 1462 if (type == OP_DEFINED)
1463 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1464 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1465 break;
8990e307 1466
463ee0b2
LW		 1467 case OP_PADAV:
1468 case OP_PADHV:
aeea060c 1469 o->op_flags |= OPf_REF;
79072805 1470 break;
aeea060c 1471
8990e307 1472 case OP_SCALAR:
79072805 1473 case OP_NULL:
11343788 1474 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1475 break;
11343788 1476 ref(cBINOPo->op_first, type);
79072805
LW		 1477 break;
1478 case OP_AELEM:
1479 case OP_HELEM:
11343788 1480 ref(cBINOPo->op_first, o->op_type);
5f05dabc 1481 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1482 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1483 : type == OP_RV2HV ? OPpDEREF_HV
1484 : OPpDEREF_SV);
11343788 1485 o->op_flags |= OPf_MOD;
8990e307 1486 }
79072805
LW		 1487 break;
1488
463ee0b2 1489 case OP_SCOPE:
79072805
LW		 1490 case OP_LEAVE:
1491 case OP_ENTER:
8990e307 1492 case OP_LIST:
11343788 1493 if (!(o->op_flags & OPf_KIDS))
79072805 1494 break;
11343788 1495 ref(cLISTOPo->op_last, type);
79072805 1496 break;
a0d0e21e
LW		 1497 default:
1498 break;
79072805 1499 }
11343788 1500 return scalar(o);
8990e307 1501
79072805
LW		 1502}
1503
09bef843
SB		 1504STATIC OP *
1505S_dup_attrlist(pTHX_ OP *o)
1506{
1507 OP *rop = Nullop;
1508
1509 /* An attrlist is either a simple OP_CONST or an OP_LIST with kids,
1510 * where the first kid is OP_PUSHMARK and the remaining ones
1511 * are OP_CONST. We need to push the OP_CONST values.
1512 */
1513 if (o->op_type == OP_CONST)
1514 rop = newSVOP(OP_CONST, o->op_flags, SvREFCNT_inc(cSVOPo->op_sv));
1515 else {
1516 assert((o->op_type == OP_LIST) && (o->op_flags & OPf_KIDS));
1517 for (o = cLISTOPo->op_first; o; o=o->op_sibling) {
1518 if (o->op_type == OP_CONST)
1519 rop = append_elem(OP_LIST, rop,
1520 newSVOP(OP_CONST, o->op_flags,
1521 SvREFCNT_inc(cSVOPo->op_sv)));
1522 }
1523 }
1524 return rop;
1525}
1526
1527STATIC void
95f0a2f1 1528S_apply_attrs(pTHX_ HV *stash, SV *target, OP *attrs, bool for_my)
09bef843 1529{
27da23d5 1530 dVAR;
09bef843
SB		 1531 SV *stashsv;
1532
1533 /* fake up C<use attributes $pkg,$rv,@attrs> */
1534 ENTER; /* need to protect against side-effects of 'use' */
1535 SAVEINT(PL_expect);
5aaec2b4 1536 stashsv = stash ? newSVhek(HvNAME_HEK(stash)) : &PL_sv_no;
e4783991 1537
09bef843 1538#define ATTRSMODULE "attributes"
95f0a2f1
SB		 1539#define ATTRSMODULE_PM "attributes.pm"
1540
1541 if (for_my) {
95f0a2f1 1542 /* Don't force the C<use> if we don't need it. */
504618e9 1543 SV **svp = hv_fetch(GvHVn(PL_incgv), ATTRSMODULE_PM,
95f0a2f1
SB		 1544 sizeof(ATTRSMODULE_PM)-1, 0);
1545 if (svp && *svp != &PL_sv_undef)
1546 ; /* already in %INC */
1547 else
1548 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
1549 newSVpvn(ATTRSMODULE, sizeof(ATTRSMODULE)-1),
1550 Nullsv);
1551 }
1552 else {
1553 Perl_load_module(aTHX_ PERL_LOADMOD_IMPORT_OPS,
1554 newSVpvn(ATTRSMODULE, sizeof(ATTRSMODULE)-1),
1555 Nullsv,
1556 prepend_elem(OP_LIST,
1557 newSVOP(OP_CONST, 0, stashsv),
1558 prepend_elem(OP_LIST,
1559 newSVOP(OP_CONST, 0,
1560 newRV(target)),
1561 dup_attrlist(attrs))));
1562 }
09bef843
SB		 1563 LEAVE;
1564}
1565
95f0a2f1
SB		 1566STATIC void
1567S_apply_attrs_my(pTHX_ HV *stash, OP *target, OP *attrs, OP **imopsp)
1568{
1569 OP *pack, *imop, *arg;
1570 SV *meth, *stashsv;
1571
1572 if (!attrs)
1573 return;
1574
1575 assert(target->op_type == OP_PADSV ||
1576 target->op_type == OP_PADHV ||
1577 target->op_type == OP_PADAV);
1578
1579 /* Ensure that attributes.pm is loaded. */
dd2155a4 1580 apply_attrs(stash, PAD_SV(target->op_targ), attrs, TRUE);
95f0a2f1
SB		 1581
1582 /* Need package name for method call. */
1583 pack = newSVOP(OP_CONST, 0, newSVpvn(ATTRSMODULE, sizeof(ATTRSMODULE)-1));
1584
1585 /* Build up the real arg-list. */
5aaec2b4
NC		 1586 stashsv = stash ? newSVhek(HvNAME_HEK(stash)) : &PL_sv_no;
1587
95f0a2f1
SB		 1588 arg = newOP(OP_PADSV, 0);
1589 arg->op_targ = target->op_targ;
1590 arg = prepend_elem(OP_LIST,
1591 newSVOP(OP_CONST, 0, stashsv),
1592 prepend_elem(OP_LIST,
1593 newUNOP(OP_REFGEN, 0,
1594 mod(arg, OP_REFGEN)),
1595 dup_attrlist(attrs)));
1596
1597 /* Fake up a method call to import */
427d62a4 1598 meth = newSVpvn_share("import", 6, 0);
95f0a2f1
SB		 1599 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL|OPf_WANT_VOID,
1600 append_elem(OP_LIST,
1601 prepend_elem(OP_LIST, pack, list(arg)),
1602 newSVOP(OP_METHOD_NAMED, 0, meth)));
1603 imop->op_private |= OPpENTERSUB_NOMOD;
1604
1605 /* Combine the ops. */
1606 *imopsp = append_elem(OP_LIST, *imopsp, imop);
1607}
1608
1609/*
1610=notfor apidoc apply_attrs_string
1611
1612Attempts to apply a list of attributes specified by the C<attrstr> and
1613C<len> arguments to the subroutine identified by the C<cv> argument which
1614is expected to be associated with the package identified by the C<stashpv>
1615argument (see L<attributes>). It gets this wrong, though, in that it
1616does not correctly identify the boundaries of the individual attribute
1617specifications within C<attrstr>. This is not really intended for the
1618public API, but has to be listed here for systems such as AIX which
1619need an explicit export list for symbols. (It's called from XS code
1620in support of the C<ATTRS:> keyword from F<xsubpp>.) Patches to fix it
1621to respect attribute syntax properly would be welcome.
1622
1623=cut
1624*/
1625
be3174d2 1626void
6867be6d
AL		 1627Perl_apply_attrs_string(pTHX_ const char *stashpv, CV *cv,
1628 const char *attrstr, STRLEN len)
be3174d2
GS		 1629{
1630 OP *attrs = Nullop;
1631
1632 if (!len) {
1633 len = strlen(attrstr);
1634 }
1635
1636 while (len) {
1637 for (; isSPACE(*attrstr) && len; --len, ++attrstr) ;
1638 if (len) {
6867be6d 1639 const char *sstr = attrstr;
be3174d2
GS		 1640 for (; !isSPACE(*attrstr) && len; --len, ++attrstr) ;
1641 attrs = append_elem(OP_LIST, attrs,
1642 newSVOP(OP_CONST, 0,
1643 newSVpvn(sstr, attrstr-sstr)));
1644 }
1645 }
1646
1647 Perl_load_module(aTHX_ PERL_LOADMOD_IMPORT_OPS,
1648 newSVpvn(ATTRSMODULE, sizeof(ATTRSMODULE)-1),
1649 Nullsv, prepend_elem(OP_LIST,
1650 newSVOP(OP_CONST, 0, newSVpv(stashpv,0)),
1651 prepend_elem(OP_LIST,
1652 newSVOP(OP_CONST, 0,
1653 newRV((SV*)cv)),
1654 attrs)));
1655}
1656
09bef843 1657STATIC OP *
95f0a2f1 1658S_my_kid(pTHX_ OP *o, OP *attrs, OP **imopsp)
93a17b20 1659{
93a17b20
LW		 1660 I32 type;
1661
3280af22 1662 if (!o || PL_error_count)
11343788 1663 return o;
93a17b20 1664
11343788 1665 type = o->op_type;
93a17b20 1666 if (type == OP_LIST) {
6867be6d 1667 OP *kid;
11343788 1668 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
95f0a2f1 1669 my_kid(kid, attrs, imopsp);
dab48698 1670 } else if (type == OP_UNDEF) {
7766148a 1671 return o;
77ca0c92
LW		 1672 } else if (type == OP_RV2SV || /* "our" declaration */
1673 type == OP_RV2AV ||
1674 type == OP_RV2HV) { /* XXX does this let anything illegal in? */
1ce0b88c
RGS		 1675 if (cUNOPo->op_first->op_type != OP_GV) { /* MJD 20011224 */
1676 yyerror(Perl_form(aTHX_ "Can't declare %s in %s",
1677 OP_DESC(o), PL_in_my == KEY_our ? "our" : "my"));
1678 } else if (attrs) {
1679 GV *gv = cGVOPx_gv(cUNOPo->op_first);
1680 PL_in_my = FALSE;
1681 PL_in_my_stash = Nullhv;
1682 apply_attrs(GvSTASH(gv),
1683 (type == OP_RV2SV ? GvSV(gv) :
1684 type == OP_RV2AV ? (SV*)GvAV(gv) :
1685 type == OP_RV2HV ? (SV*)GvHV(gv) : (SV*)gv),
1686 attrs, FALSE);
1687 }
192587c2 1688 o->op_private |= OPpOUR_INTRO;
77ca0c92 1689 return o;
95f0a2f1
SB		 1690 }
1691 else if (type != OP_PADSV &&
93a17b20
LW		 1692 type != OP_PADAV &&
1693 type != OP_PADHV &&
1694 type != OP_PUSHMARK)
1695 {
eb64745e 1696 yyerror(Perl_form(aTHX_ "Can't declare %s in \"%s\"",
53e06cf0 1697 OP_DESC(o),
eb64745e 1698 PL_in_my == KEY_our ? "our" : "my"));
11343788 1699 return o;
93a17b20 1700 }
09bef843
SB		 1701 else if (attrs && type != OP_PUSHMARK) {
1702 HV *stash;
09bef843 1703
eb64745e
GS		 1704 PL_in_my = FALSE;
1705 PL_in_my_stash = Nullhv;
1706
09bef843 1707 /* check for C<my Dog $spot> when deciding package */
dd2155a4
DM		 1708 stash = PAD_COMPNAME_TYPE(o->op_targ);
1709 if (!stash)
09bef843 1710 stash = PL_curstash;
95f0a2f1 1711 apply_attrs_my(stash, o, attrs, imopsp);
09bef843 1712 }
11343788
MB		 1713 o->op_flags |= OPf_MOD;
1714 o->op_private |= OPpLVAL_INTRO;
1715 return o;
93a17b20
LW		 1716}
1717
1718OP *
09bef843
SB		 1719Perl_my_attrs(pTHX_ OP *o, OP *attrs)
1720{
95f0a2f1
SB		 1721 OP *rops = Nullop;
1722 int maybe_scalar = 0;
1723
d2be0de5 1724/* [perl #17376]: this appears to be premature, and results in code such as
c754c3d7 1725 C< our(%x); > executing in list mode rather than void mode */
d2be0de5 1726#if 0
09bef843
SB		 1727 if (o->op_flags & OPf_PARENS)
1728 list(o);
95f0a2f1
SB		 1729 else
1730 maybe_scalar = 1;
d2be0de5
YST		 1731#else
1732 maybe_scalar = 1;
1733#endif
09bef843
SB		 1734 if (attrs)
1735 SAVEFREEOP(attrs);
95f0a2f1
SB		 1736 o = my_kid(o, attrs, &rops);
1737 if (rops) {
1738 if (maybe_scalar && o->op_type == OP_PADSV) {
1739 o = scalar(append_list(OP_LIST, (LISTOP*)rops, (LISTOP*)o));
1740 o->op_private |= OPpLVAL_INTRO;
1741 }
1742 else
1743 o = append_list(OP_LIST, (LISTOP*)o, (LISTOP*)rops);
1744 }
eb64745e
GS		 1745 PL_in_my = FALSE;
1746 PL_in_my_stash = Nullhv;
1747 return o;
09bef843
SB		 1748}
1749
1750OP *
1751Perl_my(pTHX_ OP *o)
1752{
95f0a2f1 1753 return my_attrs(o, Nullop);
09bef843
SB		 1754}
1755
1756OP *
864dbfa3 1757Perl_sawparens(pTHX_ OP *o)
79072805
LW		 1758{
1759 if (o)
1760 o->op_flags |= OPf_PARENS;
1761 return o;
1762}
1763
1764OP *
864dbfa3 1765Perl_bind_match(pTHX_ I32 type, OP *left, OP *right)
79072805 1766{
11343788 1767 OP *o;
59f00321 1768 bool ismatchop = 0;
79072805 1769
e476b1b5 1770 if (ckWARN(WARN_MISC) &&
599cee73
PM		 1771 (left->op_type == OP_RV2AV ||
1772 left->op_type == OP_RV2HV ||
1773 left->op_type == OP_PADAV ||
1774 left->op_type == OP_PADHV)) {
e1ec3a88 1775 const char *desc = PL_op_desc[(right->op_type == OP_SUBST ||
599cee73
PM		 1776 right->op_type == OP_TRANS)
1777 ? right->op_type : OP_MATCH];
dff6d3cd
GS		 1778 const char *sample = ((left->op_type == OP_RV2AV ||
1779 left->op_type == OP_PADAV)
1780 ? "@array" : "%hash");
9014280d 1781 Perl_warner(aTHX_ packWARN(WARN_MISC),
1c846c1f 1782 "Applying %s to %s will act on scalar(%s)",
599cee73 1783 desc, sample, sample);
2ae324a7 1784 }
1785
5cc9e5c9
RH		 1786 if (right->op_type == OP_CONST &&
1787 cSVOPx(right)->op_private & OPpCONST_BARE &&
1788 cSVOPx(right)->op_private & OPpCONST_STRICT)
1789 {
1790 no_bareword_allowed(right);
1791 }
1792
59f00321
RGS		 1793 ismatchop = right->op_type == OP_MATCH ||
1794 right->op_type == OP_SUBST ||
1795 right->op_type == OP_TRANS;
1796 if (ismatchop && right->op_private & OPpTARGET_MY) {
1797 right->op_targ = 0;
1798 right->op_private &= ~OPpTARGET_MY;
1799 }
1800 if (!(right->op_flags & OPf_STACKED) && ismatchop) {
79072805 1801 right->op_flags |= OPf_STACKED;
18808301
JH		 1802 if (right->op_type != OP_MATCH &&
1803 ! (right->op_type == OP_TRANS &&
1804 right->op_private & OPpTRANS_IDENTICAL))
463ee0b2 1805 left = mod(left, right->op_type);
79072805 1806 if (right->op_type == OP_TRANS)
11343788 1807 o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805 1808 else
11343788 1809 o = prepend_elem(right->op_type, scalar(left), right);
79072805 1810 if (type == OP_NOT)
11343788
MB		 1811 return newUNOP(OP_NOT, 0, scalar(o));
1812 return o;
79072805
LW		 1813 }
1814 else
1815 return bind_match(type, left,
131b3ad0 1816 pmruntime(newPMOP(OP_MATCH, 0), right, 0));
79072805
LW		 1817}
1818
1819OP *
864dbfa3 1820Perl_invert(pTHX_ OP *o)
79072805 1821{
11343788
MB		 1822 if (!o)
1823 return o;
79072805 1824 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
11343788 1825 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1826}
1827
1828OP *
864dbfa3 1829Perl_scope(pTHX_ OP *o)
79072805 1830{
27da23d5 1831 dVAR;
79072805 1832 if (o) {
3280af22 1833 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || PL_tainting) {
463ee0b2
LW		 1834 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1835 o->op_type = OP_LEAVE;
22c35a8c 1836 o->op_ppaddr = PL_ppaddr[OP_LEAVE];
463ee0b2 1837 }
fdb22418
HS		 1838 else if (o->op_type == OP_LINESEQ) {
1839 OP *kid;
1840 o->op_type = OP_SCOPE;
1841 o->op_ppaddr = PL_ppaddr[OP_SCOPE];
1842 kid = ((LISTOP*)o)->op_first;
1843 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE)
1844 op_null(kid);
463ee0b2 1845 }
fdb22418
HS		 1846 else
1847 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
79072805
LW		 1848 }
1849 return o;
1850}
1851
dfa41748 1852/* XXX kept for BINCOMPAT only */
b3ac6de7 1853void
864dbfa3 1854Perl_save_hints(pTHX)
b3ac6de7 1855{
dfa41748 1856 Perl_croak(aTHX_ "internal error: obsolete function save_hints() called");
b3ac6de7
IZ		 1857}
1858
a0d0e21e 1859int
864dbfa3 1860Perl_block_start(pTHX_ int full)
79072805 1861{
73d840c0 1862 const int retval = PL_savestack_ix;
dd2155a4 1863 pad_block_start(full);
b3ac6de7 1864 SAVEHINTS();
3280af22 1865 PL_hints &= ~HINT_BLOCK_SCOPE;
1c846c1f 1866 SAVESPTR(PL_compiling.cop_warnings);
0453d815 1867 if (! specialWARN(PL_compiling.cop_warnings)) {
599cee73
PM		 1868 PL_compiling.cop_warnings = newSVsv(PL_compiling.cop_warnings) ;
1869 SAVEFREESV(PL_compiling.cop_warnings) ;
1870 }
ac27b0f5
NIS		 1871 SAVESPTR(PL_compiling.cop_io);
1872 if (! specialCopIO(PL_compiling.cop_io)) {
1873 PL_compiling.cop_io = newSVsv(PL_compiling.cop_io) ;
1874 SAVEFREESV(PL_compiling.cop_io) ;
1875 }
a0d0e21e
LW		 1876 return retval;
1877}
1878
1879OP*
864dbfa3 1880Perl_block_end(pTHX_ I32 floor, OP *seq)
a0d0e21e 1881{
6867be6d 1882 const int needblockscope = PL_hints & HINT_BLOCK_SCOPE;
e9f19e3c 1883 OP* retval = scalarseq(seq);
e9818f4e 1884 LEAVE_SCOPE(floor);
eb160463 1885 PL_compiling.op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
a0d0e21e 1886 if (needblockscope)
3280af22 1887 PL_hints |= HINT_BLOCK_SCOPE; /* propagate out */
dd2155a4 1888 pad_leavemy();
a0d0e21e
LW		 1889 return retval;
1890}
1891
76e3520e 1892STATIC OP *
cea2e8a9 1893S_newDEFSVOP(pTHX)
54b9620d 1894{
6867be6d 1895 const I32 offset = pad_findmy("$_");
59f00321
RGS		 1896 if (offset == NOT_IN_PAD || PAD_COMPNAME_FLAGS(offset) & SVpad_OUR) {
1897 return newSVREF(newGVOP(OP_GV, 0, PL_defgv));
1898 }
1899 else {
1900 OP *o = newOP(OP_PADSV, 0);
1901 o->op_targ = offset;
1902 return o;
1903 }
54b9620d
MB		 1904}
1905
a0d0e21e 1906void
864dbfa3 1907Perl_newPROG(pTHX_ OP *o)
a0d0e21e 1908{
3280af22 1909 if (PL_in_eval) {
b295d113
TH		 1910 if (PL_eval_root)
1911 return;
faef0170
HS		 1912 PL_eval_root = newUNOP(OP_LEAVEEVAL,
1913 ((PL_in_eval & EVAL_KEEPERR)
1914 ? OPf_SPECIAL : 0), o);
3280af22 1915 PL_eval_start = linklist(PL_eval_root);
7934575e
GS		 1916 PL_eval_root->op_private |= OPpREFCOUNTED;
1917 OpREFCNT_set(PL_eval_root, 1);
3280af22 1918 PL_eval_root->op_next = 0;
a2efc822 1919 CALL_PEEP(PL_eval_start);
a0d0e21e
LW		 1920 }
1921 else {
6be89cf9
AE		 1922 if (o->op_type == OP_STUB) {
1923 PL_comppad_name = 0;
1924 PL_compcv = 0;
2a4f803a 1925 FreeOp(o);
a0d0e21e 1926 return;
6be89cf9 1927 }
3280af22
NIS		 1928 PL_main_root = scope(sawparens(scalarvoid(o)));
1929 PL_curcop = &PL_compiling;
1930 PL_main_start = LINKLIST(PL_main_root);
7934575e
GS		 1931 PL_main_root->op_private |= OPpREFCOUNTED;
1932 OpREFCNT_set(PL_main_root, 1);
3280af22 1933 PL_main_root->op_next = 0;
a2efc822 1934 CALL_PEEP(PL_main_start);
3280af22 1935 PL_compcv = 0;
3841441e 1936
4fdae800 1937 /* Register with debugger */
84902520 1938 if (PERLDB_INTER) {
864dbfa3 1939 CV *cv = get_cv("DB::postponed", FALSE);
3841441e
CS		 1940 if (cv) {
1941 dSP;
924508f0 1942 PUSHMARK(SP);
cc49e20b 1943 XPUSHs((SV*)CopFILEGV(&PL_compiling));
3841441e 1944 PUTBACK;
864dbfa3 1945 call_sv((SV*)cv, G_DISCARD);
3841441e
CS		 1946 }
1947 }
79072805 1948 }
79072805
LW		 1949}
1950
1951OP *
864dbfa3 1952Perl_localize(pTHX_ OP *o, I32 lex)
79072805
LW		 1953{
1954 if (o->op_flags & OPf_PARENS)
d2be0de5
YST		 1955/* [perl #17376]: this appears to be premature, and results in code such as
1956 C< our(%x); > executing in list mode rather than void mode */
1957#if 0
79072805 1958 list(o);
d2be0de5
YST		 1959#else
1960 ;
1961#endif
8990e307 1962 else {
64420d0d
JH		 1963 if (ckWARN(WARN_PARENTHESIS)
1964 && PL_bufptr > PL_oldbufptr && PL_bufptr[-1] == ',')
1965 {
1966 char *s = PL_bufptr;
bac662ee 1967 bool sigil = FALSE;
64420d0d 1968
8473848f 1969 /* some heuristics to detect a potential error */
bac662ee 1970 while (*s && (strchr(", \t\n", *s)))
64420d0d 1971 s++;
8473848f 1972
bac662ee
TS		 1973 while (1) {
1974 if (*s && strchr("@$%*", *s) && *++s
1975 && (isALNUM(*s) || UTF8_IS_CONTINUED(*s))) {
1976 s++;
1977 sigil = TRUE;
1978 while (*s && (isALNUM(*s) || UTF8_IS_CONTINUED(*s)))
1979 s++;
1980 while (*s && (strchr(", \t\n", *s)))
1981 s++;
1982 }
1983 else
1984 break;
1985 }
1986 if (sigil && (*s == ';' || *s == '=')) {
1987 Perl_warner(aTHX_ packWARN(WARN_PARENTHESIS),
8473848f
RGS		 1988 "Parentheses missing around \"%s\" list",
1989 lex ? (PL_in_my == KEY_our ? "our" : "my")
1990 : "local");
1991 }
8990e307
LW		 1992 }
1993 }
93a17b20 1994 if (lex)
eb64745e 1995 o = my(o);
93a17b20 1996 else
eb64745e
GS		 1997 o = mod(o, OP_NULL); /* a bit kludgey */
1998 PL_in_my = FALSE;
1999 PL_in_my_stash = Nullhv;
2000 return o;
79072805
LW		 2001}
2002
2003OP *
864dbfa3 2004Perl_jmaybe(pTHX_ OP *o)
79072805
LW		 2005{
2006 if (o->op_type == OP_LIST) {
554b3eca 2007 OP *o2;
554b3eca 2008 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
554b3eca 2009 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 2010 }
2011 return o;
2012}
2013
2014OP *
864dbfa3 2015Perl_fold_constants(pTHX_ register OP *o)
79072805 2016{
27da23d5 2017 dVAR;
79072805
LW		 2018 register OP *curop;
2019 I32 type = o->op_type;
748a9306 2020 SV *sv;
79072805 2021
22c35a8c 2022 if (PL_opargs[type] & OA_RETSCALAR)
79072805 2023 scalar(o);
b162f9ea 2024 if (PL_opargs[type] & OA_TARGET && !o->op_targ)
ed6116ce 2025 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 2026
eac055e9
GS		 2027 /* integerize op, unless it happens to be C<-foo>.
2028 * XXX should pp_i_negate() do magic string negation instead? */
2029 if ((PL_opargs[type] & OA_OTHERINT) && (PL_hints & HINT_INTEGER)
2030 && !(type == OP_NEGATE && cUNOPo->op_first->op_type == OP_CONST
2031 && (cUNOPo->op_first->op_private & OPpCONST_BARE)))
2032 {
22c35a8c 2033 o->op_ppaddr = PL_ppaddr[type = ++(o->op_type)];
eac055e9 2034 }
85e6fe83 2035
22c35a8c 2036 if (!(PL_opargs[type] & OA_FOLDCONST))
79072805
LW		 2037 goto nope;
2038
de939608 2039 switch (type) {
7a52d87a
GS		 2040 case OP_NEGATE:
2041 /* XXX might want a ck_negate() for this */
2042 cUNOPo->op_first->op_private &= ~OPpCONST_STRICT;
2043 break;
de939608
CS		 2044 case OP_SPRINTF:
2045 case OP_UCFIRST:
2046 case OP_LCFIRST:
2047 case OP_UC:
2048 case OP_LC:
69dcf70c
MB		 2049 case OP_SLT:
2050 case OP_SGT:
2051 case OP_SLE:
2052 case OP_SGE:
2053 case OP_SCMP:
2de3dbcc
JH		 2054 /* XXX what about the numeric ops? */
2055 if (PL_hints & HINT_LOCALE)
de939608
CS		 2056 goto nope;
2057 }
2058
3280af22 2059 if (PL_error_count)
a0d0e21e
LW		 2060 goto nope; /* Don't try to run w/ errors */
2061
79072805 2062 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
11fa937b
GS		 2063 if ((curop->op_type != OP_CONST ||
2064 (curop->op_private & OPpCONST_BARE)) &&
7a52d87a
GS		 2065 curop->op_type != OP_LIST &&
2066 curop->op_type != OP_SCALAR &&
2067 curop->op_type != OP_NULL &&
2068 curop->op_type != OP_PUSHMARK)
2069 {
79072805
LW		 2070 goto nope;
2071 }
2072 }
2073
2074 curop = LINKLIST(o);
2075 o->op_next = 0;
533c011a 2076 PL_op = curop;
cea2e8a9 2077 CALLRUNOPS(aTHX);
3280af22 2078 sv = *(PL_stack_sp--);
748a9306 2079 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
dd2155a4 2080 pad_swipe(o->op_targ, FALSE);
748a9306
LW		 2081 else if (SvTEMP(sv)) { /* grab mortal temp? */
2082 (void)SvREFCNT_inc(sv);
2083 SvTEMP_off(sv);
85e6fe83 2084 }
79072805
LW		 2085 op_free(o);
2086 if (type == OP_RV2GV)
b1cb66bf 2087 return newGVOP(OP_GV, 0, (GV*)sv);
52a96ae6 2088 return newSVOP(OP_CONST, 0, sv);
aeea060c 2089
79072805 2090 nope:
79072805
LW		 2091 return o;
2092}
2093
2094OP *
864dbfa3 2095Perl_gen_constant_list(pTHX_ register OP *o)
79072805 2096{
27da23d5 2097 dVAR;
79072805 2098 register OP *curop;
6867be6d 2099 const I32 oldtmps_floor = PL_tmps_floor;
79072805 2100
a0d0e21e 2101 list(o);
3280af22 2102 if (PL_error_count)
a0d0e21e
LW		 2103 return o; /* Don't attempt to run with errors */
2104
533c011a 2105 PL_op = curop = LINKLIST(o);
a0d0e21e 2106 o->op_next = 0;
a2efc822 2107 CALL_PEEP(curop);
cea2e8a9
GS		 2108 pp_pushmark();
2109 CALLRUNOPS(aTHX);
533c011a 2110 PL_op = curop;
cea2e8a9 2111 pp_anonlist();
3280af22 2112 PL_tmps_floor = oldtmps_floor;
79072805
LW		 2113
2114 o->op_type = OP_RV2AV;
22c35a8c 2115 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
fb53bbb2
SG		 2116 o->op_flags &= ~OPf_REF; /* treat \(1..2) like an ordinary list */
2117 o->op_flags |= OPf_PARENS; /* and flatten \(1..2,3) */
2814eb74 2118 o->op_opt = 0; /* needs to be revisited in peep() */
79072805 2119 curop = ((UNOP*)o)->op_first;
3280af22 2120 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*PL_stack_sp--));
79072805 2121 op_free(curop);
79072805
LW		 2122 linklist(o);
2123 return list(o);
2124}
2125
2126OP *
864dbfa3 2127Perl_convert(pTHX_ I32 type, I32 flags, OP *o)
79072805 2128{
27da23d5 2129 dVAR;
11343788
MB		 2130 if (!o || o->op_type != OP_LIST)
2131 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 2132 else
5dc0d613 2133 o->op_flags &= ~OPf_WANT;
79072805 2134
22c35a8c 2135 if (!(PL_opargs[type] & OA_MARK))
93c66552 2136 op_null(cLISTOPo->op_first);
8990e307 2137
eb160463 2138 o->op_type = (OPCODE)type;
22c35a8c 2139 o->op_ppaddr = PL_ppaddr[type];
11343788 2140 o->op_flags |= flags;
79072805 2141
11343788 2142 o = CHECKOP(type, o);
fe2774ed 2143 if (o->op_type != (unsigned)type)
11343788 2144 return o;
79072805 2145
11343788 2146 return fold_constants(o);
79072805
LW		 2147}
2148
2149/* List constructors */
2150
2151OP *
864dbfa3 2152Perl_append_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2153{
2154 if (!first)
2155 return last;
8990e307
LW		 2156
2157 if (!last)
79072805 2158 return first;
8990e307 2159
fe2774ed 2160 if (first->op_type != (unsigned)type
155aba94
GS		 2161 || (type == OP_LIST && (first->op_flags & OPf_PARENS)))
2162 {
2163 return newLISTOP(type, 0, first, last);
2164 }
79072805 2165
a0d0e21e
LW		 2166 if (first->op_flags & OPf_KIDS)
2167 ((LISTOP*)first)->op_last->op_sibling = last;
2168 else {
2169 first->op_flags |= OPf_KIDS;
2170 ((LISTOP*)first)->op_first = last;
2171 }
2172 ((LISTOP*)first)->op_last = last;
a0d0e21e 2173 return first;
79072805
LW		 2174}
2175
2176OP *
864dbfa3 2177Perl_append_list(pTHX_ I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 2178{
2179 if (!first)
2180 return (OP*)last;
8990e307
LW		 2181
2182 if (!last)
79072805 2183 return (OP*)first;
8990e307 2184
fe2774ed 2185 if (first->op_type != (unsigned)type)
79072805 2186 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307 2187
fe2774ed 2188 if (last->op_type != (unsigned)type)
79072805
LW		 2189 return append_elem(type, (OP*)first, (OP*)last);
2190
2191 first->op_last->op_sibling = last->op_first;
2192 first->op_last = last->op_last;
117dada2 2193 first->op_flags |= (last->op_flags & OPf_KIDS);
1c846c1f 2194
238a4c30
NIS		 2195 FreeOp(last);
2196
79072805
LW		 2197 return (OP*)first;
2198}
2199
2200OP *
864dbfa3 2201Perl_prepend_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2202{
2203 if (!first)
2204 return last;
8990e307
LW		 2205
2206 if (!last)
79072805 2207 return first;
8990e307 2208
fe2774ed 2209 if (last->op_type == (unsigned)type) {
8990e307
LW		 2210 if (type == OP_LIST) { /* already a PUSHMARK there */
2211 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
2212 ((LISTOP*)last)->op_first->op_sibling = first;
36a5d4ba
DC		 2213 if (!(first->op_flags & OPf_PARENS))
2214 last->op_flags &= ~OPf_PARENS;
8990e307
LW		 2215 }
2216 else {
2217 if (!(last->op_flags & OPf_KIDS)) {
2218 ((LISTOP*)last)->op_last = first;
2219 last->op_flags |= OPf_KIDS;
2220 }
2221 first->op_sibling = ((LISTOP*)last)->op_first;
2222 ((LISTOP*)last)->op_first = first;
79072805 2223 }
117dada2 2224 last->op_flags |= OPf_KIDS;
79072805
LW		 2225 return last;
2226 }
2227
2228 return newLISTOP(type, 0, first, last);
2229}
2230
2231/* Constructors */
2232
2233OP *
864dbfa3 2234Perl_newNULLLIST(pTHX)
79072805 2235{
8990e307
LW		 2236 return newOP(OP_STUB, 0);
2237}
2238
2239OP *
864dbfa3 2240Perl_force_list(pTHX_ OP *o)
8990e307 2241{
11343788
MB		 2242 if (!o || o->op_type != OP_LIST)
2243 o = newLISTOP(OP_LIST, 0, o, Nullop);
93c66552 2244 op_null(o);
11343788 2245 return o;
79072805
LW		 2246}
2247
2248OP *
864dbfa3 2249Perl_newLISTOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805 2250{
27da23d5 2251 dVAR;
79072805
LW		 2252 LISTOP *listop;
2253
b7dc083c 2254 NewOp(1101, listop, 1, LISTOP);
79072805 2255
eb160463 2256 listop->op_type = (OPCODE)type;
22c35a8c 2257 listop->op_ppaddr = PL_ppaddr[type];
117dada2
SM		 2258 if (first || last)
2259 flags |= OPf_KIDS;
eb160463 2260 listop->op_flags = (U8)flags;
79072805
LW		 2261
2262 if (!last && first)
2263 last = first;
2264 else if (!first && last)
2265 first = last;
8990e307
LW		 2266 else if (first)
2267 first->op_sibling = last;
79072805
LW		 2268 listop->op_first = first;
2269 listop->op_last = last;
8990e307
LW		 2270 if (type == OP_LIST) {
2271 OP* pushop;
2272 pushop = newOP(OP_PUSHMARK, 0);
2273 pushop->op_sibling = first;
2274 listop->op_first = pushop;
2275 listop->op_flags |= OPf_KIDS;
2276 if (!last)
2277 listop->op_last = pushop;
2278 }
79072805 2279
463d09e6 2280 return CHECKOP(type, listop);
79072805
LW		 2281}
2282
2283OP *
864dbfa3 2284Perl_newOP(pTHX_ I32 type, I32 flags)
79072805 2285{
27da23d5 2286 dVAR;
11343788 2287 OP *o;
b7dc083c 2288 NewOp(1101, o, 1, OP);
eb160463 2289 o->op_type = (OPCODE)type;
22c35a8c 2290 o->op_ppaddr = PL_ppaddr[type];
eb160463 2291 o->op_flags = (U8)flags;
79072805 2292
11343788 2293 o->op_next = o;
eb160463 2294 o->op_private = (U8)(0 | (flags >> 8));
22c35a8c 2295 if (PL_opargs[type] & OA_RETSCALAR)
11343788 2296 scalar(o);
22c35a8c 2297 if (PL_opargs[type] & OA_TARGET)
11343788
MB		 2298 o->op_targ = pad_alloc(type, SVs_PADTMP);
2299 return CHECKOP(type, o);
79072805
LW		 2300}
2301
2302OP *
864dbfa3 2303Perl_newUNOP(pTHX_ I32 type, I32 flags, OP *first)
79072805 2304{
27da23d5 2305 dVAR;
79072805
LW		 2306 UNOP *unop;
2307
93a17b20 2308 if (!first)
aeea060c 2309 first = newOP(OP_STUB, 0);
22c35a8c 2310 if (PL_opargs[type] & OA_MARK)
8990e307 2311 first = force_list(first);
93a17b20 2312
b7dc083c 2313 NewOp(1101, unop, 1, UNOP);
eb160463 2314 unop->op_type = (OPCODE)type;
22c35a8c 2315 unop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2316 unop->op_first = first;
2317 unop->op_flags = flags | OPf_KIDS;
eb160463 2318 unop->op_private = (U8)(1 | (flags >> 8));
e50aee73 2319 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 2320 if (unop->op_next)
2321 return (OP*)unop;
2322
a0d0e21e 2323 return fold_constants((OP *) unop);
79072805
LW		 2324}
2325
2326OP *
864dbfa3 2327Perl_newBINOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805 2328{
27da23d5 2329 dVAR;
79072805 2330 BINOP *binop;
b7dc083c 2331 NewOp(1101, binop, 1, BINOP);
79072805
LW		 2332
2333 if (!first)
2334 first = newOP(OP_NULL, 0);
2335
eb160463 2336 binop->op_type = (OPCODE)type;
22c35a8c 2337 binop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2338 binop->op_first = first;
2339 binop->op_flags = flags | OPf_KIDS;
2340 if (!last) {
2341 last = first;
eb160463 2342 binop->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 2343 }
2344 else {
eb160463 2345 binop->op_private = (U8)(2 | (flags >> 8));
79072805
LW		 2346 first->op_sibling = last;
2347 }
2348
e50aee73 2349 binop = (BINOP*)CHECKOP(type, binop);
eb160463 2350 if (binop->op_next || binop->op_type != (OPCODE)type)
79072805
LW		 2351 return (OP*)binop;
2352
7284ab6f 2353 binop->op_last = binop->op_first->op_sibling;
79072805 2354
a0d0e21e 2355 return fold_constants((OP *)binop);
79072805
LW		 2356}
2357
abb2c242
JH		 2358static int uvcompare(const void *a, const void *b) __attribute__nonnull__(1) __attribute__nonnull__(2) __attribute__pure__;
2359static int uvcompare(const void *a, const void *b)
2b9d42f0 2360{
e1ec3a88 2361 if (*((const UV *)a) < (*(const UV *)b))
2b9d42f0 2362 return -1;
e1ec3a88 2363 if (*((const UV *)a) > (*(const UV *)b))
2b9d42f0 2364 return 1;
e1ec3a88 2365 if (*((const UV *)a+1) < (*(const UV *)b+1))
2b9d42f0 2366 return -1;
e1ec3a88 2367 if (*((const UV *)a+1) > (*(const UV *)b+1))
2b9d42f0 2368 return 1;
a0ed51b3
LW		 2369 return 0;
2370}
2371
79072805 2372OP *
864dbfa3 2373Perl_pmtrans(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2374{
79072805
LW		 2375 SV *tstr = ((SVOP*)expr)->op_sv;
2376 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 2377 STRLEN tlen;
2378 STRLEN rlen;
5c144d81
NC		 2379 const U8 *t = (U8*)SvPV_const(tstr, tlen);
2380 const U8 *r = (U8*)SvPV_const(rstr, rlen);
79072805
LW		 2381 register I32 i;
2382 register I32 j;
a0ed51b3 2383 I32 del;
79072805 2384 I32 complement;
5d06d08e 2385 I32 squash;
9b877dbb 2386 I32 grows = 0;
79072805
LW		 2387 register short *tbl;
2388
800b4dc4 2389 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2390 complement = o->op_private & OPpTRANS_COMPLEMENT;
a0ed51b3 2391 del = o->op_private & OPpTRANS_DELETE;
5d06d08e 2392 squash = o->op_private & OPpTRANS_SQUASH;
1c846c1f 2393
036b4402
GS		 2394 if (SvUTF8(tstr))
2395 o->op_private |= OPpTRANS_FROM_UTF;
1c846c1f
NIS		 2396
2397 if (SvUTF8(rstr))
036b4402 2398 o->op_private |= OPpTRANS_TO_UTF;
79072805 2399
a0ed51b3 2400 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
79cb57f6 2401 SV* listsv = newSVpvn("# comment\n",10);
a0ed51b3 2402 SV* transv = 0;
5c144d81
NC		 2403 const U8* tend = t + tlen;
2404 const U8* rend = r + rlen;
ba210ebe 2405 STRLEN ulen;
84c133a0
RB		 2406 UV tfirst = 1;
2407 UV tlast = 0;
2408 IV tdiff;
2409 UV rfirst = 1;
2410 UV rlast = 0;
2411 IV rdiff;
2412 IV diff;
a0ed51b3
LW		 2413 I32 none = 0;
2414 U32 max = 0;
2415 I32 bits;
a0ed51b3 2416 I32 havefinal = 0;
9c5ffd7c 2417 U32 final = 0;
a0ed51b3
LW		 2418 I32 from_utf = o->op_private & OPpTRANS_FROM_UTF;
2419 I32 to_utf = o->op_private & OPpTRANS_TO_UTF;
bf4a1e57
JH		 2420 U8* tsave = NULL;
2421 U8* rsave = NULL;
2422
2423 if (!from_utf) {
2424 STRLEN len = tlen;
5c144d81 2425 t = tsave = bytes_to_utf8(t, &len);
bf4a1e57
JH		 2426 tend = t + len;
2427 }
2428 if (!to_utf && rlen) {
2429 STRLEN len = rlen;
5c144d81 2430 r = rsave = bytes_to_utf8(r, &len);
bf4a1e57
JH		 2431 rend = r + len;
2432 }
a0ed51b3 2433
2b9d42f0
NIS		 2434/* There are several snags with this code on EBCDIC:
2435 1. 0xFF is a legal UTF-EBCDIC byte (there are no illegal bytes).
2436 2. scan_const() in toke.c has encoded chars in native encoding which makes
2437 ranges at least in EBCDIC 0..255 range the bottom odd.
2438*/
2439
a0ed51b3 2440 if (complement) {
89ebb4a3 2441 U8 tmpbuf[UTF8_MAXBYTES+1];
2b9d42f0 2442 UV *cp;
a0ed51b3 2443 UV nextmin = 0;
2b9d42f0 2444 New(1109, cp, 2*tlen, UV);
a0ed51b3 2445 i = 0;
79cb57f6 2446 transv = newSVpvn("",0);
a0ed51b3 2447 while (t < tend) {
2b9d42f0
NIS		 2448 cp[2*i] = utf8n_to_uvuni(t, tend-t, &ulen, 0);
2449 t += ulen;
2450 if (t < tend && NATIVE_TO_UTF(*t) == 0xff) {
a0ed51b3 2451 t++;
2b9d42f0
NIS		 2452 cp[2*i+1] = utf8n_to_uvuni(t, tend-t, &ulen, 0);
2453 t += ulen;
a0ed51b3 2454 }
2b9d42f0
NIS		 2455 else {
2456 cp[2*i+1] = cp[2*i];
2457 }
2458 i++;
a0ed51b3 2459 }
2b9d42f0 2460 qsort(cp, i, 2*sizeof(UV), uvcompare);
a0ed51b3 2461 for (j = 0; j < i; j++) {
2b9d42f0 2462 UV val = cp[2*j];
a0ed51b3
LW		 2463 diff = val - nextmin;
2464 if (diff > 0) {
9041c2e3 2465 t = uvuni_to_utf8(tmpbuf,nextmin);
dfe13c55 2466 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3 2467 if (diff > 1) {
2b9d42f0 2468 U8 range_mark = UTF_TO_NATIVE(0xff);
9041c2e3 2469 t = uvuni_to_utf8(tmpbuf, val - 1);
2b9d42f0 2470 sv_catpvn(transv, (char *)&range_mark, 1);
dfe13c55 2471 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2472 }
2473 }
2b9d42f0 2474 val = cp[2*j+1];
a0ed51b3
LW		 2475 if (val >= nextmin)
2476 nextmin = val + 1;
2477 }
9041c2e3 2478 t = uvuni_to_utf8(tmpbuf,nextmin);
dfe13c55 2479 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
2b9d42f0
NIS		 2480 {
2481 U8 range_mark = UTF_TO_NATIVE(0xff);
2482 sv_catpvn(transv, (char *)&range_mark, 1);
2483 }
b851fbc1
JH		 2484 t = uvuni_to_utf8_flags(tmpbuf, 0x7fffffff,
2485 UNICODE_ALLOW_SUPER);
dfe13c55 2486 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
93524f2b 2487 t = (const U8*)SvPVX_const(transv);
a0ed51b3
LW		 2488 tlen = SvCUR(transv);
2489 tend = t + tlen;
455d824a 2490 Safefree(cp);
a0ed51b3
LW		 2491 }
2492 else if (!rlen && !del) {
2493 r = t; rlen = tlen; rend = tend;
4757a243
LW		 2494 }
2495 if (!squash) {
05d340b8 2496 if ((!rlen && !del) || t == r ||
12ae5dfc 2497 (tlen == rlen && memEQ((char *)t, (char *)r, tlen)))
01ec43d0 2498 {
4757a243 2499 o->op_private |= OPpTRANS_IDENTICAL;
01ec43d0 2500 }
a0ed51b3
LW		 2501 }
2502
2503 while (t < tend || tfirst <= tlast) {
2504 /* see if we need more "t" chars */
2505 if (tfirst > tlast) {
9041c2e3 2506 tfirst = (I32)utf8n_to_uvuni(t, tend - t, &ulen, 0);
a0ed51b3 2507 t += ulen;
2b9d42f0 2508 if (t < tend && NATIVE_TO_UTF(*t) == 0xff) { /* illegal utf8 val indicates range */
ba210ebe 2509 t++;
9041c2e3 2510 tlast = (I32)utf8n_to_uvuni(t, tend - t, &ulen, 0);
a0ed51b3
LW		 2511 t += ulen;
2512 }
2513 else
2514 tlast = tfirst;
2515 }
2516
2517 /* now see if we need more "r" chars */
2518 if (rfirst > rlast) {
2519 if (r < rend) {
9041c2e3 2520 rfirst = (I32)utf8n_to_uvuni(r, rend - r, &ulen, 0);
a0ed51b3 2521 r += ulen;
2b9d42f0 2522 if (r < rend && NATIVE_TO_UTF(*r) == 0xff) { /* illegal utf8 val indicates range */
ba210ebe 2523 r++;
9041c2e3 2524 rlast = (I32)utf8n_to_uvuni(r, rend - r, &ulen, 0);
a0ed51b3
LW		 2525 r += ulen;
2526 }
2527 else
2528 rlast = rfirst;
2529 }
2530 else {
2531 if (!havefinal++)
2532 final = rlast;
2533 rfirst = rlast = 0xffffffff;
2534 }
2535 }
2536
2537 /* now see which range will peter our first, if either. */
2538 tdiff = tlast - tfirst;
2539 rdiff = rlast - rfirst;
2540
2541 if (tdiff <= rdiff)
2542 diff = tdiff;
2543 else
2544 diff = rdiff;
2545
2546 if (rfirst == 0xffffffff) {
2547 diff = tdiff; /* oops, pretend rdiff is infinite */
2548 if (diff > 0)
894356b3
GS		 2549 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\tXXXX\n",
2550 (long)tfirst, (long)tlast);
a0ed51b3 2551 else
894356b3 2552 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\tXXXX\n", (long)tfirst);
a0ed51b3
LW		 2553 }
2554 else {
2555 if (diff > 0)
894356b3
GS		 2556 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\t%04lx\n",
2557 (long)tfirst, (long)(tfirst + diff),
2558 (long)rfirst);
a0ed51b3 2559 else
894356b3
GS		 2560 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\t%04lx\n",
2561 (long)tfirst, (long)rfirst);
a0ed51b3
LW		 2562
2563 if (rfirst + diff > max)
2564 max = rfirst + diff;
9b877dbb 2565 if (!grows)
45005bfb
JH		 2566 grows = (tfirst < rfirst &&
2567 UNISKIP(tfirst) < UNISKIP(rfirst + diff));
2568 rfirst += diff + 1;
a0ed51b3
LW		 2569 }
2570 tfirst += diff + 1;
2571 }
2572
2573 none = ++max;
2574 if (del)
2575 del = ++max;
2576
2577 if (max > 0xffff)
2578 bits = 32;
2579 else if (max > 0xff)
2580 bits = 16;
2581 else
2582 bits = 8;
2583
455d824a 2584 Safefree(cPVOPo->op_pv);
a0ed51b3
LW		 2585 cSVOPo->op_sv = (SV*)swash_init("utf8", "", listsv, bits, none);
2586 SvREFCNT_dec(listsv);
2587 if (transv)
2588 SvREFCNT_dec(transv);
2589
45005bfb 2590 if (!del && havefinal && rlen)
b448e4fe
JH		 2591 (void)hv_store((HV*)SvRV((cSVOPo->op_sv)), "FINAL", 5,
2592 newSVuv((UV)final), 0);
a0ed51b3 2593
9b877dbb 2594 if (grows)
a0ed51b3
LW		 2595 o->op_private |= OPpTRANS_GROWS;
2596
9b877dbb
IH		 2597 if (tsave)
2598 Safefree(tsave);
2599 if (rsave)
2600 Safefree(rsave);
2601
a0ed51b3
LW		 2602 op_free(expr);
2603 op_free(repl);
2604 return o;
2605 }
2606
2607 tbl = (short*)cPVOPo->op_pv;
79072805
LW		 2608 if (complement) {
2609 Zero(tbl, 256, short);
eb160463 2610 for (i = 0; i < (I32)tlen; i++)
ec49126f 2611 tbl[t[i]] = -1;
79072805
LW		 2612 for (i = 0, j = 0; i < 256; i++) {
2613 if (!tbl[i]) {
eb160463 2614 if (j >= (I32)rlen) {
a0ed51b3 2615 if (del)
79072805
LW		 2616 tbl[i] = -2;
2617 else if (rlen)
ec49126f 2618 tbl[i] = r[j-1];
79072805 2619 else
eb160463 2620 tbl[i] = (short)i;
79072805 2621 }
9b877dbb
IH		 2622 else {
2623 if (i < 128 && r[j] >= 128)
2624 grows = 1;
ec49126f 2625 tbl[i] = r[j++];
9b877dbb 2626 }
79072805
LW		 2627 }
2628 }
05d340b8
JH		 2629 if (!del) {
2630 if (!rlen) {
2631 j = rlen;
2632 if (!squash)
2633 o->op_private |= OPpTRANS_IDENTICAL;
2634 }
eb160463 2635 else if (j >= (I32)rlen)
05d340b8
JH		 2636 j = rlen - 1;
2637 else
2638 cPVOPo->op_pv = (char*)Renew(tbl, 0x101+rlen-j, short);
8973db79 2639 tbl[0x100] = rlen - j;
eb160463 2640 for (i=0; i < (I32)rlen - j; i++)
8973db79
JH		 2641 tbl[0x101+i] = r[j+i];
2642 }
79072805
LW		 2643 }
2644 else {
a0ed51b3 2645 if (!rlen && !del) {
79072805 2646 r = t; rlen = tlen;
5d06d08e 2647 if (!squash)
4757a243 2648 o->op_private |= OPpTRANS_IDENTICAL;
79072805 2649 }
94bfe852
RGS		 2650 else if (!squash && rlen == tlen && memEQ((char*)t, (char*)r, tlen)) {
2651 o->op_private |= OPpTRANS_IDENTICAL;
2652 }
79072805
LW		 2653 for (i = 0; i < 256; i++)
2654 tbl[i] = -1;
eb160463
GS		 2655 for (i = 0, j = 0; i < (I32)tlen; i++,j++) {
2656 if (j >= (I32)rlen) {
a0ed51b3 2657 if (del) {
ec49126f 2658 if (tbl[t[i]] == -1)
2659 tbl[t[i]] = -2;
79072805
LW		 2660 continue;
2661 }
2662 --j;
2663 }
9b877dbb
IH		 2664 if (tbl[t[i]] == -1) {
2665 if (t[i] < 128 && r[j] >= 128)
2666 grows = 1;
ec49126f 2667 tbl[t[i]] = r[j];
9b877dbb 2668 }
79072805
LW		 2669 }
2670 }
9b877dbb
IH		 2671 if (grows)
2672 o->op_private |= OPpTRANS_GROWS;
79072805
LW		 2673 op_free(expr);
2674 op_free(repl);
2675
11343788 2676 return o;
79072805
LW		 2677}
2678
2679OP *
864dbfa3 2680Perl_newPMOP(pTHX_ I32 type, I32 flags)
79072805 2681{
27da23d5 2682 dVAR;
79072805
LW		 2683 PMOP *pmop;
2684
b7dc083c 2685 NewOp(1101, pmop, 1, PMOP);
eb160463 2686 pmop->op_type = (OPCODE)type;
22c35a8c 2687 pmop->op_ppaddr = PL_ppaddr[type];
eb160463
GS		 2688 pmop->op_flags = (U8)flags;
2689 pmop->op_private = (U8)(0 | (flags >> 8));
79072805 2690
3280af22 2691 if (PL_hints & HINT_RE_TAINT)
b3eb6a9b 2692 pmop->op_pmpermflags |= PMf_RETAINT;
3280af22 2693 if (PL_hints & HINT_LOCALE)
b3eb6a9b
GS		 2694 pmop->op_pmpermflags |= PMf_LOCALE;
2695 pmop->op_pmflags = pmop->op_pmpermflags;
36477c24 2696
debc9467 2697#ifdef USE_ITHREADS
13137afc
AB		 2698 {
2699 SV* repointer;
2700 if(av_len((AV*) PL_regex_pad[0]) > -1) {
2701 repointer = av_pop((AV*)PL_regex_pad[0]);
2702 pmop->op_pmoffset = SvIV(repointer);
1cc8b4c5 2703 SvREPADTMP_off(repointer);
13137afc 2704 sv_setiv(repointer,0);
1eb1540c 2705 } else {
13137afc
AB		 2706 repointer = newSViv(0);
2707 av_push(PL_regex_padav,SvREFCNT_inc(repointer));
2708 pmop->op_pmoffset = av_len(PL_regex_padav);
2709 PL_regex_pad = AvARRAY(PL_regex_padav);
1fcf4c12 2710 }
13137afc 2711 }
debc9467 2712#endif
1eb1540c 2713
1fcf4c12 2714 /* link into pm list */
3280af22 2715 if (type != OP_TRANS && PL_curstash) {
8d2f4536
NC		 2716 MAGIC *mg = mg_find((SV*)PL_curstash, PERL_MAGIC_symtab);
2717
2718 if (!mg) {
2719 mg = sv_magicext((SV*)PL_curstash, 0, PERL_MAGIC_symtab, 0, 0, 0);
2720 }
2721 pmop->op_pmnext = (PMOP*)mg->mg_obj;
2722 mg->mg_obj = (SV*)pmop;
cb55de95 2723 PmopSTASH_set(pmop,PL_curstash);
79072805
LW		 2724 }
2725
463d09e6 2726 return CHECKOP(type, pmop);
79072805
LW		 2727}
2728
131b3ad0
DM		 2729/* Given some sort of match op o, and an expression expr containing a
2730 * pattern, either compile expr into a regex and attach it to o (if it's
2731 * constant), or convert expr into a runtime regcomp op sequence (if it's
2732 * not)
2733 *
2734 * isreg indicates that the pattern is part of a regex construct, eg
2735 * $x =~ /pattern/ or split /pattern/, as opposed to $x =~ $pattern or
2736 * split "pattern", which aren't. In the former case, expr will be a list
2737 * if the pattern contains more than one term (eg /a$b/) or if it contains
2738 * a replacement, ie s/// or tr///.
2739 */
2740
79072805 2741OP *
131b3ad0 2742Perl_pmruntime(pTHX_ OP *o, OP *expr, bool isreg)
79072805 2743{
27da23d5 2744 dVAR;
79072805
LW		 2745 PMOP *pm;
2746 LOGOP *rcop;
ce862d02 2747 I32 repl_has_vars = 0;
131b3ad0
DM		 2748 OP* repl = Nullop;
2749 bool reglist;
2750
2751 if (o->op_type == OP_SUBST || o->op_type == OP_TRANS) {
2752 /* last element in list is the replacement; pop it */
2753 OP* kid;
2754 repl = cLISTOPx(expr)->op_last;
2755 kid = cLISTOPx(expr)->op_first;
2756 while (kid->op_sibling != repl)
2757 kid = kid->op_sibling;
2758 kid->op_sibling = Nullop;
2759 cLISTOPx(expr)->op_last = kid;
2760 }
79072805 2761
131b3ad0
DM		 2762 if (isreg && expr->op_type == OP_LIST &&
2763 cLISTOPx(expr)->op_first->op_sibling == cLISTOPx(expr)->op_last)
2764 {
2765 /* convert single element list to element */
2766 OP* oe = expr;
2767 expr = cLISTOPx(oe)->op_first->op_sibling;
2768 cLISTOPx(oe)->op_first->op_sibling = Nullop;
2769 cLISTOPx(oe)->op_last = Nullop;
2770 op_free(oe);
2771 }
2772
2773 if (o->op_type == OP_TRANS) {
11343788 2774 return pmtrans(o, expr, repl);
131b3ad0
DM		 2775 }
2776
2777 reglist = isreg && expr->op_type == OP_LIST;
2778 if (reglist)
2779 op_null(expr);
79072805 2780
3280af22 2781 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2782 pm = (PMOP*)o;
79072805
LW		 2783
2784 if (expr->op_type == OP_CONST) {
463ee0b2 2785 STRLEN plen;
79072805 2786 SV *pat = ((SVOP*)expr)->op_sv;
5c144d81 2787 const char *p = SvPV_const(pat, plen);
770526c1 2788 if ((o->op_flags & OPf_SPECIAL) && (*p == ' ' && p[1] == '\0')) {
5c144d81
NC		 2789 U32 was_readonly = SvREADONLY(pat);
2790
2791 if (was_readonly) {
2792 if (SvFAKE(pat)) {
2793 sv_force_normal_flags(pat, 0);
2794 assert(!SvREADONLY(pat));
2795 was_readonly = 0;
2796 } else {
2797 SvREADONLY_off(pat);
2798 }
2799 }
2800
93a17b20 2801 sv_setpvn(pat, "\\s+", 3);
5c144d81
NC		 2802
2803 SvFLAGS(pat) |= was_readonly;
2804
2805 p = SvPV_const(pat, plen);
79072805
LW		 2806 pm->op_pmflags |= PMf_SKIPWHITE;
2807 }
5b71a6a7 2808 if (DO_UTF8(pat))
a5961de5 2809 pm->op_pmdynflags |= PMdf_UTF8;
5c144d81
NC		 2810 /* FIXME - can we make this function take const char * args? */
2811 PM_SETRE(pm, CALLREGCOMP(aTHX_ (char*)p, (char*)p + plen, pm));
aaa362c4 2812 if (strEQ("\\s+", PM_GETRE(pm)->precomp))
85e6fe83 2813 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2814 op_free(expr);
2815 }
2816 else {
3280af22 2817 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL))
1c846c1f 2818 expr = newUNOP((!(PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2819 ? OP_REGCRESET
2820 : OP_REGCMAYBE),0,expr);
463ee0b2 2821
b7dc083c 2822 NewOp(1101, rcop, 1, LOGOP);
79072805 2823 rcop->op_type = OP_REGCOMP;
22c35a8c 2824 rcop->op_ppaddr = PL_ppaddr[OP_REGCOMP];
79072805 2825 rcop->op_first = scalar(expr);
131b3ad0
DM		 2826 rcop->op_flags |= OPf_KIDS
2827 | ((PL_hints & HINT_RE_EVAL) ? OPf_SPECIAL : 0)
2828 | (reglist ? OPf_STACKED : 0);
79072805 2829 rcop->op_private = 1;
11343788 2830 rcop->op_other = o;
131b3ad0
DM		 2831 if (reglist)
2832 rcop->op_targ = pad_alloc(rcop->op_type, SVs_PADTMP);
2833
b5c19bd7
DM		 2834 /* /$x/ may cause an eval, since $x might be qr/(?{..})/ */
2835 PL_cv_has_eval = 1;
79072805
LW		 2836
2837 /* establish postfix order */
3280af22 2838 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL)) {
463ee0b2
LW		 2839 LINKLIST(expr);
2840 rcop->op_next = expr;
2841 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2842 }
2843 else {
2844 rcop->op_next = LINKLIST(expr);
2845 expr->op_next = (OP*)rcop;
2846 }
79072805 2847
11343788 2848 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2849 }
2850
2851 if (repl) {
748a9306 2852 OP *curop;
0244c3a4 2853 if (pm->op_pmflags & PMf_EVAL) {
748a9306 2854 curop = 0;
8bafa735 2855 if (CopLINE(PL_curcop) < (line_t)PL_multi_end)
eb160463 2856 CopLINE_set(PL_curcop, (line_t)PL_multi_end);
0244c3a4 2857 }
748a9306
LW		 2858 else if (repl->op_type == OP_CONST)
2859 curop = repl;
79072805 2860 else {
79072805
LW		 2861 OP *lastop = 0;
2862 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
22c35a8c 2863 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805 2864 if (curop->op_type == OP_GV) {
638eceb6 2865 GV *gv = cGVOPx_gv(curop);
ce862d02 2866 repl_has_vars = 1;
f702bf4a 2867 if (strchr("&`'123456789+-\016\022", *GvENAME(gv)))
79072805
LW		 2868 break;
2869 }
2870 else if (curop->op_type == OP_RV2CV)
2871 break;
2872 else if (curop->op_type == OP_RV2SV ||
2873 curop->op_type == OP_RV2AV ||
2874 curop->op_type == OP_RV2HV ||
2875 curop->op_type == OP_RV2GV) {
2876 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2877 break;
2878 }
748a9306
LW		 2879 else if (curop->op_type == OP_PADSV ||
2880 curop->op_type == OP_PADAV ||
2881 curop->op_type == OP_PADHV ||
554b3eca 2882 curop->op_type == OP_PADANY) {
ce862d02 2883 repl_has_vars = 1;
748a9306 2884 }
1167e5da
SM		 2885 else if (curop->op_type == OP_PUSHRE)
2886 ; /* Okay here, dangerous in newASSIGNOP */
79072805
LW		 2887 else
2888 break;
2889 }
2890 lastop = curop;
2891 }
748a9306 2892 }
ce862d02 2893 if (curop == repl
1c846c1f 2894 && !(repl_has_vars
aaa362c4
RS		 2895 && (!PM_GETRE(pm)
2896 || PM_GETRE(pm)->reganch & ROPT_EVAL_SEEN))) {
748a9306 2897 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2898 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2899 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2900 }
2901 else {
aaa362c4 2902 if (curop == repl && !PM_GETRE(pm)) { /* Has variables. */
ce862d02
IZ		 2903 pm->op_pmflags |= PMf_MAYBE_CONST;
2904 pm->op_pmpermflags |= PMf_MAYBE_CONST;
2905 }
b7dc083c 2906 NewOp(1101, rcop, 1, LOGOP);
748a9306 2907 rcop->op_type = OP_SUBSTCONT;
22c35a8c 2908 rcop->op_ppaddr = PL_ppaddr[OP_SUBSTCONT];
748a9306
LW		 2909 rcop->op_first = scalar(repl);
2910 rcop->op_flags |= OPf_KIDS;
2911 rcop->op_private = 1;
11343788 2912 rcop->op_other = o;
748a9306
LW		 2913
2914 /* establish postfix order */
2915 rcop->op_next = LINKLIST(repl);
2916 repl->op_next = (OP*)rcop;
2917
2918 pm->op_pmreplroot = scalar((OP*)rcop);
2919 pm->op_pmreplstart = LINKLIST(rcop);
2920 rcop->op_next = 0;
79072805
LW		 2921 }
2922 }
2923
2924 return (OP*)pm;
2925}
2926
2927OP *
864dbfa3 2928Perl_newSVOP(pTHX_ I32 type, I32 flags, SV *sv)
79072805 2929{
27da23d5 2930 dVAR;
79072805 2931 SVOP *svop;
b7dc083c 2932 NewOp(1101, svop, 1, SVOP);
eb160463 2933 svop->op_type = (OPCODE)type;
22c35a8c 2934 svop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2935 svop->op_sv = sv;
2936 svop->op_next = (OP*)svop;
eb160463 2937 svop->op_flags = (U8)flags;
22c35a8c 2938 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2939 scalar((OP*)svop);
22c35a8c 2940 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2941 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2942 return CHECKOP(type, svop);
79072805
LW		 2943}
2944
2945OP *
350de78d
GS		 2946Perl_newPADOP(pTHX_ I32 type, I32 flags, SV *sv)
2947{
27da23d5 2948 dVAR;
350de78d
GS		 2949 PADOP *padop;
2950 NewOp(1101, padop, 1, PADOP);
eb160463 2951 padop->op_type = (OPCODE)type;
350de78d
GS		 2952 padop->op_ppaddr = PL_ppaddr[type];
2953 padop->op_padix = pad_alloc(type, SVs_PADTMP);
dd2155a4
DM		 2954 SvREFCNT_dec(PAD_SVl(padop->op_padix));
2955 PAD_SETSV(padop->op_padix, sv);
ce50c033
AMS		 2956 if (sv)
2957 SvPADTMP_on(sv);
350de78d 2958 padop->op_next = (OP*)padop;
eb160463 2959 padop->op_flags = (U8)flags;
350de78d
GS		 2960 if (PL_opargs[type] & OA_RETSCALAR)
2961 scalar((OP*)padop);
2962 if (PL_opargs[type] & OA_TARGET)
2963 padop->op_targ = pad_alloc(type, SVs_PADTMP);
2964 return CHECKOP(type, padop);
2965}
2966
2967OP *
864dbfa3 2968Perl_newGVOP(pTHX_ I32 type, I32 flags, GV *gv)
79072805 2969{
27da23d5 2970 dVAR;
350de78d 2971#ifdef USE_ITHREADS
ce50c033
AMS		 2972 if (gv)
2973 GvIN_PAD_on(gv);
350de78d
GS		 2974 return newPADOP(type, flags, SvREFCNT_inc(gv));
2975#else
7934575e 2976 return newSVOP(type, flags, SvREFCNT_inc(gv));
350de78d 2977#endif
79072805
LW		 2978}
2979
2980OP *
864dbfa3 2981Perl_newPVOP(pTHX_ I32 type, I32 flags, char *pv)
79072805 2982{
27da23d5 2983 dVAR;
79072805 2984 PVOP *pvop;
b7dc083c 2985 NewOp(1101, pvop, 1, PVOP);
eb160463 2986 pvop->op_type = (OPCODE)type;
22c35a8c 2987 pvop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2988 pvop->op_pv = pv;
2989 pvop->op_next = (OP*)pvop;
eb160463 2990 pvop->op_flags = (U8)flags;
22c35a8c 2991 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2992 scalar((OP*)pvop);
22c35a8c 2993 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2994 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2995 return CHECKOP(type, pvop);
79072805
LW		 2996}
2997
79072805 2998void
864dbfa3 2999Perl_package(pTHX_ OP *o)
79072805 3000{
6867be6d 3001 const char *name;
de11ba31 3002 STRLEN len;
79072805 3003
3280af22
NIS		 3004 save_hptr(&PL_curstash);
3005 save_item(PL_curstname);
de11ba31 3006
5c144d81 3007 name = SvPV_const(cSVOPo->op_sv, len);
de11ba31
AMS		 3008 PL_curstash = gv_stashpvn(name, len, TRUE);
3009 sv_setpvn(PL_curstname, name, len);
3010 op_free(o);
3011
7ad382f4 3012 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 3013 PL_copline = NOLINE;
3014 PL_expect = XSTATE;
79072805
LW		 3015}
3016
85e6fe83 3017void
88d95a4d 3018Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *idop, OP *arg)
85e6fe83 3019{
a0d0e21e 3020 OP *pack;
a0d0e21e 3021 OP *imop;
b1cb66bf 3022 OP *veop;
85e6fe83 3023
88d95a4d 3024 if (idop->op_type != OP_CONST)
cea2e8a9 3025 Perl_croak(aTHX_ "Module name must be constant");
85e6fe83 3026
b1cb66bf 3027 veop = Nullop;
3028
0f79a09d 3029 if (version != Nullop) {
b1cb66bf 3030 SV *vesv = ((SVOP*)version)->op_sv;
3031
44dcb63b 3032 if (arg == Nullop && !SvNIOKp(vesv)) {
b1cb66bf 3033 arg = version;
3034 }
3035 else {
3036 OP *pack;
0f79a09d 3037 SV *meth;
b1cb66bf 3038
44dcb63b 3039 if (version->op_type != OP_CONST || !SvNIOKp(vesv))
cea2e8a9 3040 Perl_croak(aTHX_ "Version number must be constant number");
b1cb66bf 3041
88d95a4d
JH		 3042 /* Make copy of idop so we don't free it twice */
3043 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv));
b1cb66bf 3044
3045 /* Fake up a method call to VERSION */
427d62a4 3046 meth = newSVpvn_share("VERSION", 7, 0);
b1cb66bf 3047 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
3048 append_elem(OP_LIST,
0f79a09d
GS		 3049 prepend_elem(OP_LIST, pack, list(version)),
3050 newSVOP(OP_METHOD_NAMED, 0, meth)));
b1cb66bf 3051 }
3052 }
aeea060c 3053
a0d0e21e 3054 /* Fake up an import/unimport */
4633a7c4
LW		 3055 if (arg && arg->op_type == OP_STUB)
3056 imop = arg; /* no import on explicit () */
88d95a4d 3057 else if (SvNIOKp(((SVOP*)idop)->op_sv)) {
b1cb66bf 3058 imop = Nullop; /* use 5.0; */
3059 }
4633a7c4 3060 else {
0f79a09d
GS		 3061 SV *meth;
3062
88d95a4d
JH		 3063 /* Make copy of idop so we don't free it twice */
3064 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv));
0f79a09d
GS		 3065
3066 /* Fake up a method call to import/unimport */
427d62a4
NC		 3067 meth = aver
3068 ? newSVpvn_share("import",6, 0) : newSVpvn_share("unimport", 8, 0);
4633a7c4 3069 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
0f79a09d
GS		 3070 append_elem(OP_LIST,
3071 prepend_elem(OP_LIST, pack, list(arg)),
3072 newSVOP(OP_METHOD_NAMED, 0, meth)));
4633a7c4
LW		 3073 }
3074
a0d0e21e 3075 /* Fake up the BEGIN {}, which does its thing immediately. */
09bef843 3076 newATTRSUB(floor,
427d62a4 3077 newSVOP(OP_CONST, 0, newSVpvn_share("BEGIN", 5, 0)),
4633a7c4 3078 Nullop,
09bef843 3079 Nullop,
a0d0e21e 3080 append_elem(OP_LINESEQ,
b1cb66bf 3081 append_elem(OP_LINESEQ,
88d95a4d 3082 newSTATEOP(0, Nullch, newUNOP(OP_REQUIRE, 0, idop)),
b1cb66bf 3083 newSTATEOP(0, Nullch, veop)),
a0d0e21e 3084 newSTATEOP(0, Nullch, imop) ));
85e6fe83 3085
70f5e4ed
JH		 3086 /* The "did you use incorrect case?" warning used to be here.
3087 * The problem is that on case-insensitive filesystems one
3088 * might get false positives for "use" (and "require"):
3089 * "use Strict" or "require CARP" will work. This causes
3090 * portability problems for the script: in case-strict
3091 * filesystems the script will stop working.
3092 *
3093 * The "incorrect case" warning checked whether "use Foo"
3094 * imported "Foo" to your namespace, but that is wrong, too:
3095 * there is no requirement nor promise in the language that
3096 * a Foo.pm should or would contain anything in package "Foo".
3097 *
3098 * There is very little Configure-wise that can be done, either:
3099 * the case-sensitivity of the build filesystem of Perl does not
3100 * help in guessing the case-sensitivity of the runtime environment.
3101 */
18fc9488 3102
c305c6a0 3103 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 3104 PL_copline = NOLINE;
3105 PL_expect = XSTATE;
8ec8fbef 3106 PL_cop_seqmax++; /* Purely for B::*'s benefit */
85e6fe83
LW		 3107}
3108
7d3fb230 3109/*
ccfc67b7
JH		 3110=head1 Embedding Functions
3111
7d3fb230
BS		 3112=for apidoc load_module
3113
3114Loads the module whose name is pointed to by the string part of name.
3115Note that the actual module name, not its filename, should be given.
3116Eg, "Foo::Bar" instead of "Foo/Bar.pm". flags can be any of
3117PERL_LOADMOD_DENY, PERL_LOADMOD_NOIMPORT, or PERL_LOADMOD_IMPORT_OPS
3118(or 0 for no flags). ver, if specified, provides version semantics
3119similar to C<use Foo::Bar VERSION>. The optional trailing SV*
3120arguments can be used to specify arguments to the module's import()
3121method, similar to C<use Foo::Bar VERSION LIST>.
3122
3123=cut */
3124
e4783991
GS		 3125void
3126Perl_load_module(pTHX_ U32 flags, SV *name, SV *ver, ...)
3127{
3128 va_list args;
3129 va_start(args, ver);
3130 vload_module(flags, name, ver, &args);
3131 va_end(args);
3132}
3133
3134#ifdef PERL_IMPLICIT_CONTEXT
3135void
3136Perl_load_module_nocontext(U32 flags, SV *name, SV *ver, ...)
3137{
3138 dTHX;
3139 va_list args;
3140 va_start(args, ver);
3141 vload_module(flags, name, ver, &args);
3142 va_end(args);
3143}
3144#endif
3145
3146void
3147Perl_vload_module(pTHX_ U32 flags, SV *name, SV *ver, va_list *args)
3148{
3149 OP *modname, *veop, *imop;
3150
3151 modname = newSVOP(OP_CONST, 0, name);
3152 modname->op_private |= OPpCONST_BARE;
3153 if (ver) {
3154 veop = newSVOP(OP_CONST, 0, ver);
3155 }
3156 else
3157 veop = Nullop;
3158 if (flags & PERL_LOADMOD_NOIMPORT) {
3159 imop = sawparens(newNULLLIST());
3160 }
3161 else if (flags & PERL_LOADMOD_IMPORT_OPS) {
3162 imop = va_arg(*args, OP*);
3163 }
3164 else {
3165 SV *sv;
3166 imop = Nullop;
3167 sv = va_arg(*args, SV*);
3168 while (sv) {
3169 imop = append_elem(OP_LIST, imop, newSVOP(OP_CONST, 0, sv));
3170 sv = va_arg(*args, SV*);
3171 }
3172 }
81885997 3173 {
6867be6d
AL		 3174 const line_t ocopline = PL_copline;
3175 COP * const ocurcop = PL_curcop;
3176 const int oexpect = PL_expect;
81885997
GS		 3177
3178 utilize(!(flags & PERL_LOADMOD_DENY), start_subparse(FALSE, 0),
3179 veop, modname, imop);
3180 PL_expect = oexpect;
3181 PL_copline = ocopline;
834a3ffa 3182 PL_curcop = ocurcop;
81885997 3183 }
e4783991
GS		 3184}
3185
79072805 3186OP *
864dbfa3 3187Perl_dofile(pTHX_ OP *term)
78ca652e
GS		 3188{
3189 OP *doop;
3190 GV *gv;
3191
3192 gv = gv_fetchpv("do", FALSE, SVt_PVCV);
b9f751c0 3193 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv)))
78ca652e
GS		 3194 gv = gv_fetchpv("CORE::GLOBAL::do", FALSE, SVt_PVCV);
3195
b9f751c0 3196 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
78ca652e
GS		 3197 doop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
3198 append_elem(OP_LIST, term,
3199 scalar(newUNOP(OP_RV2CV, 0,
3200 newGVOP(OP_GV, 0,
3201 gv))))));
3202 }
3203 else {
3204 doop = newUNOP(OP_DOFILE, 0, scalar(term));
3205 }
3206 return doop;
3207}
3208
3209OP *
864dbfa3 3210Perl_newSLICEOP(pTHX_ I32 flags, OP *subscript, OP *listval)
79072805
LW		 3211{
3212 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 3213 list(force_list(subscript)),
3214 list(force_list(listval)) );
79072805
LW		 3215}
3216
76e3520e 3217STATIC I32
504618e9 3218S_is_list_assignment(pTHX_ register const OP *o)
79072805 3219{
11343788 3220 if (!o)
79072805
LW		 3221 return TRUE;
3222
11343788
MB		 3223 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
3224 o = cUNOPo->op_first;
79072805 3225
11343788 3226 if (o->op_type == OP_COND_EXPR) {
504618e9
AL		 3227 const I32 t = is_list_assignment(cLOGOPo->op_first->op_sibling);
3228 const I32 f = is_list_assignment(cLOGOPo->op_first->op_sibling->op_sibling);
79072805
LW		 3229
3230 if (t && f)
3231 return TRUE;
3232 if (t || f)
3233 yyerror("Assignment to both a list and a scalar");
3234 return FALSE;
3235 }
3236
95f0a2f1
SB		 3237 if (o->op_type == OP_LIST &&
3238 (o->op_flags & OPf_WANT) == OPf_WANT_SCALAR &&
3239 o->op_private & OPpLVAL_INTRO)
3240 return FALSE;
3241
11343788
MB		 3242 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
3243 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
3244 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 3245 return TRUE;
3246
11343788 3247 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 3248 return TRUE;
3249
11343788 3250 if (o->op_type == OP_RV2SV)
79072805
LW		 3251 return FALSE;
3252
3253 return FALSE;
3254}
3255
3256OP *
864dbfa3 3257Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
79072805 3258{
11343788 3259 OP *o;
79072805 3260
a0d0e21e 3261 if (optype) {
c963b151 3262 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN || optype == OP_DORASSIGN) {
a0d0e21e
LW		 3263 return newLOGOP(optype, 0,
3264 mod(scalar(left), optype),
3265 newUNOP(OP_SASSIGN, 0, scalar(right)));
3266 }
3267 else {
3268 return newBINOP(optype, OPf_STACKED,
3269 mod(scalar(left), optype), scalar(right));
3270 }
3271 }
3272
504618e9 3273 if (is_list_assignment(left)) {
10c8fecd
GS		 3274 OP *curop;
3275
3280af22
NIS		 3276 PL_modcount = 0;
3277 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 3278 left = mod(left, OP_AASSIGN);
3280af22
NIS		 3279 if (PL_eval_start)
3280 PL_eval_start = 0;
748a9306 3281 else {
a0d0e21e
LW		 3282 op_free(left);
3283 op_free(right);
3284 return Nullop;
3285 }
b9d46b39
RGS		 3286 /* optimise C<my @x = ()> to C<my @x>, and likewise for hashes */
3287 if ((left->op_type == OP_PADAV || left->op_type == OP_PADHV)
3288 && right->op_type == OP_STUB
3289 && (left->op_private & OPpLVAL_INTRO))
3290 {
3291 op_free(right);
9ff53bc9 3292 left->op_flags &= ~(OPf_REF|OPf_SPECIAL);
b9d46b39
RGS		 3293 return left;
3294 }
10c8fecd
GS		 3295 curop = list(force_list(left));
3296 o = newBINOP(OP_AASSIGN, flags, list(force_list(right)), curop);
eb160463 3297 o->op_private = (U8)(0 | (flags >> 8));
dd2155a4
DM		 3298
3299 /* PL_generation sorcery:
3300 * an assignment like ($a,$b) = ($c,$d) is easier than
3301 * ($a,$b) = ($c,$a), since there is no need for temporary vars.
3302 * To detect whether there are common vars, the global var
3303 * PL_generation is incremented for each assign op we compile.
3304 * Then, while compiling the assign op, we run through all the
3305 * variables on both sides of the assignment, setting a spare slot
3306 * in each of them to PL_generation. If any of them already have
3307 * that value, we know we've got commonality. We could use a
3308 * single bit marker, but then we'd have to make 2 passes, first
3309 * to clear the flag, then to test and set it. To find somewhere
3310 * to store these values, evil chicanery is done with SvCUR().
3311 */
3312
a0d0e21e 3313 if (!(left->op_private & OPpLVAL_INTRO)) {
11343788 3314 OP *lastop = o;
3280af22 3315 PL_generation++;
11343788 3316 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
22c35a8c 3317 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805 3318 if (curop->op_type == OP_GV) {
638eceb6 3319 GV *gv = cGVOPx_gv(curop);
eb160463 3320 if (gv == PL_defgv || (int)SvCUR(gv) == PL_generation)
79072805 3321 break;
b162af07 3322 SvCUR_set(gv, PL_generation);
79072805 3323 }
748a9306
LW		 3324 else if (curop->op_type == OP_PADSV ||
3325 curop->op_type == OP_PADAV ||
3326 curop->op_type == OP_PADHV ||
dd2155a4
DM		 3327 curop->op_type == OP_PADANY)
3328 {
3329 if (PAD_COMPNAME_GEN(curop->op_targ)
92251a1e 3330 == (STRLEN)PL_generation)
748a9306 3331 break;
b162af07 3332 PAD_COMPNAME_GEN_set(curop->op_targ, PL_generation);
dd2155a4 3333
748a9306 3334 }
79072805
LW		 3335 else if (curop->op_type == OP_RV2CV)
3336 break;
3337 else if (curop->op_type == OP_RV2SV ||
3338 curop->op_type == OP_RV2AV ||
3339 curop->op_type == OP_RV2HV ||
3340 curop->op_type == OP_RV2GV) {
3341 if (lastop->op_type != OP_GV) /* funny deref? */
3342 break;
3343 }
1167e5da
SM		 3344 else if (curop->op_type == OP_PUSHRE) {
3345 if (((PMOP*)curop)->op_pmreplroot) {
b3f5893f 3346#ifdef USE_ITHREADS
dd2155a4
DM		 3347 GV *gv = (GV*)PAD_SVl(INT2PTR(PADOFFSET,
3348 ((PMOP*)curop)->op_pmreplroot));
b3f5893f 3349#else
1167e5da 3350 GV *gv = (GV*)((PMOP*)curop)->op_pmreplroot;
b3f5893f 3351#endif
eb160463 3352 if (gv == PL_defgv || (int)SvCUR(gv) == PL_generation)
1167e5da 3353 break;
b162af07 3354 SvCUR_set(gv, PL_generation);
b2ffa427 3355 }
1167e5da 3356 }
79072805
LW		 3357 else
3358 break;
3359 }
3360 lastop = curop;
3361 }
11343788 3362 if (curop != o)
10c8fecd 3363 o->op_private |= OPpASSIGN_COMMON;
79072805 3364 }
c07a80fd 3365 if (right && right->op_type == OP_SPLIT) {
3366 OP* tmpop;
3367 if ((tmpop = ((LISTOP*)right)->op_first) &&
3368 tmpop->op_type == OP_PUSHRE)
3369 {
3370 PMOP *pm = (PMOP*)tmpop;
3371 if (left->op_type == OP_RV2AV &&
3372 !(left->op_private & OPpLVAL_INTRO) &&
11343788 3373 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 3374 {
3375 tmpop = ((UNOP*)left)->op_first;
3376 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
971a9dd3 3377#ifdef USE_ITHREADS
ba89bb6e 3378 pm->op_pmreplroot = INT2PTR(OP*, cPADOPx(tmpop)->op_padix);
971a9dd3
GS		 3379 cPADOPx(tmpop)->op_padix = 0; /* steal it */
3380#else
3381 pm->op_pmreplroot = (OP*)cSVOPx(tmpop)->op_sv;
3382 cSVOPx(tmpop)->op_sv = Nullsv; /* steal it */
3383#endif
c07a80fd 3384 pm->op_pmflags |= PMf_ONCE;
11343788 3385 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 3386 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
3387 tmpop->op_sibling = Nullop; /* don't free split */
3388 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 3389 op_free(o); /* blow off assign */
54310121 3390 right->op_flags &= ~OPf_WANT;
a5f75d66 3391 /* "I don't know and I don't care." */
c07a80fd 3392 return right;
3393 }
3394 }
3395 else {
e6438c1a 3396 if (PL_modcount < RETURN_UNLIMITED_NUMBER &&
c07a80fd 3397 ((LISTOP*)right)->op_last->op_type == OP_CONST)
3398 {
3399 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
3400 if (SvIVX(sv) == 0)
3280af22 3401 sv_setiv(sv, PL_modcount+1);
c07a80fd 3402 }
3403 }
3404 }
3405 }
11343788 3406 return o;
79072805
LW		 3407 }
3408 if (!right)
3409 right = newOP(OP_UNDEF, 0);
3410 if (right->op_type == OP_READLINE) {
3411 right->op_flags |= OPf_STACKED;
463ee0b2 3412 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 3413 }
a0d0e21e 3414 else {
3280af22 3415 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 3416 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 3417 scalar(right), mod(scalar(left), OP_SASSIGN) );
3280af22
NIS		 3418 if (PL_eval_start)
3419 PL_eval_start = 0;
748a9306 3420 else {
11343788 3421 op_free(o);
a0d0e21e
LW		 3422 return Nullop;
3423 }
3424 }
11343788 3425 return o;
79072805
LW		 3426}
3427
3428OP *
864dbfa3 3429Perl_newSTATEOP(pTHX_ I32 flags, char *label, OP *o)
79072805 3430{
27da23d5 3431 dVAR;
e1ec3a88 3432 const U32 seq = intro_my();
79072805
LW		 3433 register COP *cop;
3434
b7dc083c 3435 NewOp(1101, cop, 1, COP);
57843af0 3436 if (PERLDB_LINE && CopLINE(PL_curcop) && PL_curstash != PL_debstash) {
8990e307 3437 cop->op_type = OP_DBSTATE;
22c35a8c 3438 cop->op_ppaddr = PL_ppaddr[ OP_DBSTATE ];
8990e307
LW		 3439 }
3440 else {
3441 cop->op_type = OP_NEXTSTATE;
22c35a8c 3442 cop->op_ppaddr = PL_ppaddr[ OP_NEXTSTATE ];
8990e307 3443 }
eb160463
GS		 3444 cop->op_flags = (U8)flags;
3445 cop->op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
ff0cee69 3446#ifdef NATIVE_HINTS
3447 cop->op_private |= NATIVE_HINTS;
3448#endif
e24b16f9 3449 PL_compiling.op_private = cop->op_private;
79072805
LW		 3450 cop->op_next = (OP*)cop;
3451
463ee0b2
LW		 3452 if (label) {
3453 cop->cop_label = label;
3280af22 3454 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 3455 }
bbce6d69 3456 cop->cop_seq = seq;
3280af22 3457 cop->cop_arybase = PL_curcop->cop_arybase;
0453d815 3458 if (specialWARN(PL_curcop->cop_warnings))
599cee73 3459 cop->cop_warnings = PL_curcop->cop_warnings ;
1c846c1f 3460 else
599cee73 3461 cop->cop_warnings = newSVsv(PL_curcop->cop_warnings) ;
ac27b0f5
NIS		 3462 if (specialCopIO(PL_curcop->cop_io))
3463 cop->cop_io = PL_curcop->cop_io;
3464 else
3465 cop->cop_io = newSVsv(PL_curcop->cop_io) ;
599cee73 3466
79072805 3467
3280af22 3468 if (PL_copline == NOLINE)
57843af0 3469 CopLINE_set(cop, CopLINE(PL_curcop));
79072805 3470 else {
57843af0 3471 CopLINE_set(cop, PL_copline);
3280af22 3472 PL_copline = NOLINE;
79072805 3473 }
57843af0 3474#ifdef USE_ITHREADS
f4dd75d9 3475 CopFILE_set(cop, CopFILE(PL_curcop)); /* XXX share in a pvtable? */
57843af0 3476#else
f4dd75d9 3477 CopFILEGV_set(cop, CopFILEGV(PL_curcop));
57843af0 3478#endif
11faa288 3479 CopSTASH_set(cop, PL_curstash);
79072805 3480
3280af22 3481 if (PERLDB_LINE && PL_curstash != PL_debstash) {
cc49e20b 3482 SV **svp = av_fetch(CopFILEAV(PL_curcop), (I32)CopLINE(cop), FALSE);
1eb1540c 3483 if (svp && *svp != &PL_sv_undef ) {
0ac0412a 3484 (void)SvIOK_on(*svp);
45977657 3485 SvIV_set(*svp, PTR2IV(cop));
1eb1540c 3486 }
93a17b20
LW		 3487 }
3488
722969e2 3489 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 3490}
3491
bbce6d69 3492
79072805 3493OP *
864dbfa3 3494Perl_newLOGOP(pTHX_ I32 type, I32 flags, OP *first, OP *other)
79072805 3495{
27da23d5 3496 dVAR;
883ffac3
CS		 3497 return new_logop(type, flags, &first, &other);
3498}
3499
3bd495df 3500STATIC OP *
cea2e8a9 3501S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
883ffac3 3502{
27da23d5 3503 dVAR;
79072805 3504 LOGOP *logop;
11343788 3505 OP *o;
883ffac3
CS		 3506 OP *first = *firstp;
3507 OP *other = *otherp;
79072805 3508
a0d0e21e
LW		 3509 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
3510 return newBINOP(type, flags, scalar(first), scalar(other));
3511
8990e307 3512 scalarboolean(first);
79072805
LW		 3513 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
3514 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
3515 if (type == OP_AND || type == OP_OR) {
3516 if (type == OP_AND)
3517 type = OP_OR;
3518 else
3519 type = OP_AND;
11343788 3520 o = first;
883ffac3 3521 first = *firstp = cUNOPo->op_first;
11343788
MB		 3522 if (o->op_next)
3523 first->op_next = o->op_next;
3524 cUNOPo->op_first = Nullop;
3525 op_free(o);
79072805
LW		 3526 }
3527 }
3528 if (first->op_type == OP_CONST) {
39a440a3
DM		 3529 if (first->op_private & OPpCONST_STRICT)
3530 no_bareword_allowed(first);
3531 else if (ckWARN(WARN_BAREWORD) && (first->op_private & OPpCONST_BARE))
989dfb19 3532 Perl_warner(aTHX_ packWARN(WARN_BAREWORD), "Bareword found in conditional");
75cc09e4
MHM		 3533 if ((type == OP_AND && SvTRUE(((SVOP*)first)->op_sv)) ||
3534 (type == OP_OR && !SvTRUE(((SVOP*)first)->op_sv)) ||
3535 (type == OP_DOR && !SvOK(((SVOP*)first)->op_sv))) {
79072805 3536 op_free(first);
883ffac3 3537 *firstp = Nullop;
d6fee5c7
DM		 3538 if (other->op_type == OP_CONST)
3539 other->op_private |= OPpCONST_SHORTCIRCUIT;
79072805
LW		 3540 return other;
3541 }
3542 else {
7921d0f2 3543 /* check for C<my $x if 0>, or C<my($x,$y) if 0> */
6867be6d 3544 const OP *o2 = other;
7921d0f2
DM		 3545 if ( ! (o2->op_type == OP_LIST
3546 && (( o2 = cUNOPx(o2)->op_first))
3547 && o2->op_type == OP_PUSHMARK
3548 && (( o2 = o2->op_sibling)) )
3549 )
3550 o2 = other;
3551 if ((o2->op_type == OP_PADSV || o2->op_type == OP_PADAV
3552 || o2->op_type == OP_PADHV)
3553 && o2->op_private & OPpLVAL_INTRO
3554 && ckWARN(WARN_DEPRECATED))
3555 {
3556 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
3557 "Deprecated use of my() in false conditional");
3558 }
3559
79072805 3560 op_free(other);
883ffac3 3561 *otherp = Nullop;
d6fee5c7
DM		 3562 if (first->op_type == OP_CONST)
3563 first->op_private |= OPpCONST_SHORTCIRCUIT;
79072805
LW		 3564 return first;
3565 }
3566 }
59e10468
RGS		 3567 else if (ckWARN(WARN_MISC) && (first->op_flags & OPf_KIDS) &&
3568 type != OP_DOR) /* [#24076] Don't warn for <FH> err FOO. */
3569 {
6867be6d
AL		 3570 const OP *k1 = ((UNOP*)first)->op_first;
3571 const OP *k2 = k1->op_sibling;
a6006777 3572 OPCODE warnop = 0;
3573 switch (first->op_type)
3574 {
3575 case OP_NULL:
3576 if (k2 && k2->op_type == OP_READLINE
3577 && (k2->op_flags & OPf_STACKED)
1c846c1f 3578 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
72b16652 3579 {
a6006777 3580 warnop = k2->op_type;
72b16652 3581 }
a6006777 3582 break;
3583
3584 case OP_SASSIGN:
68dc0745 3585 if (k1->op_type == OP_READDIR
3586 || k1->op_type == OP_GLOB
72b16652 3587 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
68dc0745 3588 || k1->op_type == OP_EACH)
72b16652
GS		 3589 {
3590 warnop = ((k1->op_type == OP_NULL)
eb160463 3591 ? (OPCODE)k1->op_targ : k1->op_type);
72b16652 3592 }
a6006777 3593 break;
3594 }
8ebc5c01 3595 if (warnop) {
6867be6d 3596 const line_t oldline = CopLINE(PL_curcop);
57843af0 3597 CopLINE_set(PL_curcop, PL_copline);
9014280d 3598 Perl_warner(aTHX_ packWARN(WARN_MISC),
599cee73 3599 "Value of %s%s can be \"0\"; test with defined()",
22c35a8c 3600 PL_op_desc[warnop],
68dc0745 3601 ((warnop == OP_READLINE || warnop == OP_GLOB)
3602 ? " construct" : "() operator"));
57843af0 3603 CopLINE_set(PL_curcop, oldline);
8ebc5c01 3604 }
a6006777 3605 }
79072805
LW		 3606
3607 if (!other)
3608 return first;
3609
c963b151 3610 if (type == OP_ANDASSIGN || type == OP_ORASSIGN || type == OP_DORASSIGN)
a0d0e21e
LW		 3611 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
3612
b7dc083c 3613 NewOp(1101, logop, 1, LOGOP);
79072805 3614
eb160463 3615 logop->op_type = (OPCODE)type;
22c35a8c 3616 logop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3617 logop->op_first = first;
3618 logop->op_flags = flags | OPf_KIDS;
3619 logop->op_other = LINKLIST(other);
eb160463 3620 logop->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 3621
3622 /* establish postfix order */
3623 logop->op_next = LINKLIST(first);
3624 first->op_next = (OP*)logop;
3625 first->op_sibling = other;
3626
463d09e6
RGS		 3627 CHECKOP(type,logop);
3628
11343788
MB		 3629 o = newUNOP(OP_NULL, 0, (OP*)logop);
3630 other->op_next = o;
79072805 3631
11343788 3632 return o;
79072805
LW		 3633}
3634
3635OP *
864dbfa3 3636Perl_newCONDOP(pTHX_ I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 3637{
27da23d5 3638 dVAR;
1a67a97c
SM		 3639 LOGOP *logop;
3640 OP *start;
11343788 3641 OP *o;
79072805 3642
b1cb66bf 3643 if (!falseop)
3644 return newLOGOP(OP_AND, 0, first, trueop);
3645 if (!trueop)
3646 return newLOGOP(OP_OR, 0, first, falseop);
79072805 3647
8990e307 3648 scalarboolean(first);
79072805 3649 if (first->op_type == OP_CONST) {
2bc6235c
K		 3650 if (first->op_private & OPpCONST_BARE &&
3651 first->op_private & OPpCONST_STRICT) {
3652 no_bareword_allowed(first);
3653 }
79072805
LW		 3654 if (SvTRUE(((SVOP*)first)->op_sv)) {
3655 op_free(first);
b1cb66bf 3656 op_free(falseop);
3657 return trueop;
79072805
LW		 3658 }
3659 else {
3660 op_free(first);
b1cb66bf 3661 op_free(trueop);
3662 return falseop;
79072805
LW		 3663 }
3664 }
1a67a97c
SM		 3665 NewOp(1101, logop, 1, LOGOP);
3666 logop->op_type = OP_COND_EXPR;
3667 logop->op_ppaddr = PL_ppaddr[OP_COND_EXPR];
3668 logop->op_first = first;
3669 logop->op_flags = flags | OPf_KIDS;
eb160463 3670 logop->op_private = (U8)(1 | (flags >> 8));
1a67a97c
SM		 3671 logop->op_other = LINKLIST(trueop);
3672 logop->op_next = LINKLIST(falseop);
79072805 3673
463d09e6
RGS		 3674 CHECKOP(OP_COND_EXPR, /* that's logop->op_type */
3675 logop);
79072805
LW		 3676
3677 /* establish postfix order */
1a67a97c
SM		 3678 start = LINKLIST(first);
3679 first->op_next = (OP*)logop;
79072805 3680
b1cb66bf 3681 first->op_sibling = trueop;
3682 trueop->op_sibling = falseop;
1a67a97c 3683 o = newUNOP(OP_NULL, 0, (OP*)logop);
79072805 3684
1a67a97c 3685 trueop->op_next = falseop->op_next = o;
79072805 3686
1a67a97c 3687 o->op_next = start;
11343788 3688 return o;
79072805
LW		 3689}
3690
3691OP *
864dbfa3 3692Perl_newRANGE(pTHX_ I32 flags, OP *left, OP *right)
79072805 3693{
27da23d5 3694 dVAR;
1a67a97c 3695 LOGOP *range;
79072805
LW		 3696 OP *flip;
3697 OP *flop;
1a67a97c 3698 OP *leftstart;
11343788 3699 OP *o;
79072805 3700
1a67a97c 3701 NewOp(1101, range, 1, LOGOP);
79072805 3702
1a67a97c
SM		 3703 range->op_type = OP_RANGE;
3704 range->op_ppaddr = PL_ppaddr[OP_RANGE];
3705 range->op_first = left;
3706 range->op_flags = OPf_KIDS;
3707 leftstart = LINKLIST(left);
3708 range->op_other = LINKLIST(right);
eb160463 3709 range->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 3710
3711 left->op_sibling = right;
3712
1a67a97c
SM		 3713 range->op_next = (OP*)range;
3714 flip = newUNOP(OP_FLIP, flags, (OP*)range);
79072805 3715 flop = newUNOP(OP_FLOP, 0, flip);
11343788 3716 o = newUNOP(OP_NULL, 0, flop);
79072805 3717 linklist(flop);
1a67a97c 3718 range->op_next = leftstart;
79072805
LW		 3719
3720 left->op_next = flip;
3721 right->op_next = flop;
3722
1a67a97c
SM		 3723 range->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
3724 sv_upgrade(PAD_SV(range->op_targ), SVt_PVNV);
ed6116ce 3725 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 3726 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
3727
3728 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3729 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3730
11343788 3731 flip->op_next = o;
79072805 3732 if (!flip->op_private || !flop->op_private)
11343788 3733 linklist(o); /* blow off optimizer unless constant */
79072805 3734
11343788 3735 return o;
79072805
LW		 3736}
3737
3738OP *
864dbfa3 3739Perl_newLOOPOP(pTHX_ I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 3740{
463ee0b2 3741 OP* listop;
11343788 3742 OP* o;
73d840c0 3743 const bool once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 3744 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
73d840c0 3745 (void)debuggable;
93a17b20 3746
463ee0b2
LW		 3747 if (expr) {
3748 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
3749 return block; /* do {} while 0 does once */
fb73857a 3750 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3751 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 3752 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3753 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4 3754 } else if (expr->op_flags & OPf_KIDS) {
73d840c0
AL		 3755 const OP *k1 = ((UNOP*)expr)->op_first;
3756 const OP *k2 = (k1) ? k1->op_sibling : NULL;
55d729e4 3757 switch (expr->op_type) {
1c846c1f 3758 case OP_NULL:
55d729e4
GS		 3759 if (k2 && k2->op_type == OP_READLINE
3760 && (k2->op_flags & OPf_STACKED)
1c846c1f 3761 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
55d729e4 3762 expr = newUNOP(OP_DEFINED, 0, expr);
1c846c1f 3763 break;
55d729e4
GS		 3764
3765 case OP_SASSIGN:
3766 if (k1->op_type == OP_READDIR
3767 || k1->op_type == OP_GLOB
6531c3e6 3768 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
55d729e4
GS		 3769 || k1->op_type == OP_EACH)
3770 expr = newUNOP(OP_DEFINED, 0, expr);
3771 break;
3772 }
774d564b 3773 }
463ee0b2 3774 }
93a17b20 3775
e1548254
RGS		 3776 /* if block is null, the next append_elem() would put UNSTACK, a scalar
3777 * op, in listop. This is wrong. [perl #27024] */
3778 if (!block)
3779 block = newOP(OP_NULL, 0);
8990e307 3780 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
883ffac3 3781 o = new_logop(OP_AND, 0, &expr, &listop);
463ee0b2 3782
883ffac3
CS		 3783 if (listop)
3784 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 3785
11343788
MB		 3786 if (once && o != listop)
3787 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 3788
11343788
MB		 3789 if (o == listop)
3790 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 3791
11343788
MB		 3792 o->op_flags |= flags;
3793 o = scope(o);
3794 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
3795 return o;
79072805
LW		 3796}
3797
3798OP *
a034e688
DM		 3799Perl_newWHILEOP(pTHX_ I32 flags, I32 debuggable, LOOP *loop, I32
3800whileline, OP *expr, OP *block, OP *cont, I32 has_my)
79072805 3801{
27da23d5 3802 dVAR;
79072805
LW		 3803 OP *redo;
3804 OP *next = 0;
3805 OP *listop;
11343788 3806 OP *o;
1ba6ee2b 3807 U8 loopflags = 0;
73d840c0 3808 (void)debuggable;
79072805 3809
fb73857a 3810 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3811 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB))) {
748a9306 3812 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3813 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4 3814 } else if (expr && (expr->op_flags & OPf_KIDS)) {
e1ec3a88
AL		 3815 const OP *k1 = ((UNOP*)expr)->op_first;
3816 const OP *k2 = (k1) ? k1->op_sibling : NULL;
55d729e4 3817 switch (expr->op_type) {
1c846c1f 3818 case OP_NULL:
55d729e4
GS		 3819 if (k2 && k2->op_type == OP_READLINE
3820 && (k2->op_flags & OPf_STACKED)
1c846c1f 3821 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
55d729e4 3822 expr = newUNOP(OP_DEFINED, 0, expr);
1c846c1f 3823 break;
55d729e4
GS		 3824
3825 case OP_SASSIGN:
3826 if (k1->op_type == OP_READDIR
3827 || k1->op_type == OP_GLOB
72b16652 3828 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
55d729e4
GS		 3829 || k1->op_type == OP_EACH)
3830 expr = newUNOP(OP_DEFINED, 0, expr);
3831 break;
3832 }
748a9306 3833 }
79072805
LW		 3834
3835 if (!block)
3836 block = newOP(OP_NULL, 0);
a034e688 3837 else if (cont || has_my) {
87246558
GS		 3838 block = scope(block);
3839 }
79072805 3840
1ba6ee2b 3841 if (cont) {
79072805 3842 next = LINKLIST(cont);
1ba6ee2b 3843 }
fb73857a 3844 if (expr) {
85538317
GS		 3845 OP *unstack = newOP(OP_UNSTACK, 0);
3846 if (!next)
3847 next = unstack;
3848 cont = append_elem(OP_LINESEQ, cont, unstack);
fb73857a 3849 }
79072805 3850
463ee0b2 3851 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 3852 redo = LINKLIST(listop);
3853
3854 if (expr) {
eb160463 3855 PL_copline = (line_t)whileline;
883ffac3
CS		 3856 scalar(listop);
3857 o = new_logop(OP_AND, 0, &expr, &listop);
11343788 3858 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 3859 op_free(expr); /* oops, it's a while (0) */
463ee0b2 3860 op_free((OP*)loop);
883ffac3 3861 return Nullop; /* listop already freed by new_logop */
463ee0b2 3862 }
883ffac3 3863 if (listop)
497b47a8 3864 ((LISTOP*)listop)->op_last->op_next =
883ffac3 3865 (o == listop ? redo : LINKLIST(o));
79072805
LW		 3866 }
3867 else
11343788 3868 o = listop;
79072805
LW		 3869
3870 if (!loop) {
b7dc083c 3871 NewOp(1101,loop,1,LOOP);
79072805 3872 loop->op_type = OP_ENTERLOOP;
22c35a8c 3873 loop->op_ppaddr = PL_ppaddr[OP_ENTERLOOP];
79072805
LW		 3874 loop->op_private = 0;
3875 loop->op_next = (OP*)loop;
3876 }
3877
11343788 3878 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 3879
3880 loop->op_redoop = redo;
11343788 3881 loop->op_lastop = o;
1ba6ee2b 3882 o->op_private |= loopflags;
79072805
LW		 3883
3884 if (next)
3885 loop->op_nextop = next;
3886 else
11343788 3887 loop->op_nextop = o;
79072805 3888
11343788
MB		 3889 o->op_flags |= flags;
3890 o->op_private |= (flags >> 8);
3891 return o;
79072805
LW		 3892}
3893
3894OP *
66a1b24b 3895Perl_newFOROP(pTHX_ I32 flags, char *label, line_t forline, OP *sv, OP *expr, OP *block, OP *cont)
79072805 3896{
27da23d5 3897 dVAR;
79072805 3898 LOOP *loop;
fb73857a 3899 OP *wop;
4bbc6d12 3900 PADOFFSET padoff = 0;
4633a7c4 3901 I32 iterflags = 0;
241416b8 3902 I32 iterpflags = 0;
79072805 3903
79072805 3904 if (sv) {
85e6fe83 3905 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
241416b8 3906 iterpflags = sv->op_private & OPpOUR_INTRO; /* for our $x () */
748a9306 3907 sv->op_type = OP_RV2GV;
22c35a8c 3908 sv->op_ppaddr = PL_ppaddr[OP_RV2GV];
79072805 3909 }
85e6fe83 3910 else if (sv->op_type == OP_PADSV) { /* private variable */
241416b8 3911 iterpflags = sv->op_private & OPpLVAL_INTRO; /* for my $x () */
85e6fe83 3912 padoff = sv->op_targ;
743e66e6 3913 sv->op_targ = 0;
85e6fe83
LW		 3914 op_free(sv);
3915 sv = Nullop;
3916 }
54b9620d
MB		 3917 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
3918 padoff = sv->op_targ;
743e66e6 3919 sv->op_targ = 0;
54b9620d
MB		 3920 iterflags |= OPf_SPECIAL;
3921 op_free(sv);
3922 sv = Nullop;
3923 }
79072805 3924 else
cea2e8a9 3925 Perl_croak(aTHX_ "Can't use %s for loop variable", PL_op_desc[sv->op_type]);
79072805
LW		 3926 }
3927 else {
73d840c0 3928 const I32 offset = pad_findmy("$_");
aabe9514
RGS		 3929 if (offset == NOT_IN_PAD || PAD_COMPNAME_FLAGS(offset) & SVpad_OUR) {
3930 sv = newGVOP(OP_GV, 0, PL_defgv);
3931 }
3932 else {
3933 padoff = offset;
aabe9514 3934 }
79072805 3935 }
5f05dabc 3936 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
89ea2908 3937 expr = mod(force_list(scalar(ref(expr, OP_ITER))), OP_GREPSTART);
4633a7c4
LW		 3938 iterflags |= OPf_STACKED;
3939 }
89ea2908
GA		 3940 else if (expr->op_type == OP_NULL &&
3941 (expr->op_flags & OPf_KIDS) &&
3942 ((BINOP*)expr)->op_first->op_type == OP_FLOP)
3943 {
3944 /* Basically turn for($x..$y) into the same as for($x,$y), but we
3945 * set the STACKED flag to indicate that these values are to be
3946 * treated as min/max values by 'pp_iterinit'.
3947 */
3948 UNOP* flip = (UNOP*)((UNOP*)((BINOP*)expr)->op_first)->op_first;
1a67a97c 3949 LOGOP* range = (LOGOP*) flip->op_first;
66a1b24b
AL		 3950 OP* const left = range->op_first;
3951 OP* const right = left->op_sibling;
5152d7c7 3952 LISTOP* listop;
89ea2908
GA		 3953
3954 range->op_flags &= ~OPf_KIDS;
3955 range->op_first = Nullop;
3956
5152d7c7 3957 listop = (LISTOP*)newLISTOP(OP_LIST, 0, left, right);
1a67a97c
SM		 3958 listop->op_first->op_next = range->op_next;
3959 left->op_next = range->op_other;
5152d7c7
GS		 3960 right->op_next = (OP*)listop;
3961 listop->op_next = listop->op_first;
89ea2908
GA		 3962
3963 op_free(expr);
5152d7c7 3964 expr = (OP*)(listop);
93c66552 3965 op_null(expr);
89ea2908
GA		 3966 iterflags |= OPf_STACKED;
3967 }
3968 else {
3969 expr = mod(force_list(expr), OP_GREPSTART);
3970 }
3971
4633a7c4 3972 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
89ea2908 3973 append_elem(OP_LIST, expr, scalar(sv))));
85e6fe83 3974 assert(!loop->op_next);
241416b8 3975 /* for my $x () sets OPpLVAL_INTRO;
14f338dc 3976 * for our $x () sets OPpOUR_INTRO */
c5661c80 3977 loop->op_private = (U8)iterpflags;
b7dc083c 3978#ifdef PL_OP_SLAB_ALLOC
155aba94
GS		 3979 {
3980 LOOP *tmp;
3981 NewOp(1234,tmp,1,LOOP);
bd5f3bc4 3982 Copy(loop,tmp,1,LISTOP);
238a4c30 3983 FreeOp(loop);
155aba94
GS		 3984 loop = tmp;
3985 }
b7dc083c 3986#else
85e6fe83 3987 Renew(loop, 1, LOOP);
1c846c1f 3988#endif
85e6fe83 3989 loop->op_targ = padoff;
a034e688 3990 wop = newWHILEOP(flags, 1, loop, forline, newOP(OP_ITER, 0), block, cont, 0);
3280af22 3991 PL_copline = forline;
fb73857a 3992 return newSTATEOP(0, label, wop);
79072805
LW		 3993}
3994
8990e307 3995OP*
864dbfa3 3996Perl_newLOOPEX(pTHX_ I32 type, OP *label)
8990e307 3997{
11343788 3998 OP *o;
2d8e6c8d 3999
8990e307 4000 if (type != OP_GOTO || label->op_type == OP_CONST) {
cdaebead
MB		 4001 /* "last()" means "last" */
4002 if (label->op_type == OP_STUB && (label->op_flags & OPf_PARENS))
4003 o = newOP(type, OPf_SPECIAL);
4004 else {
4005 o = newPVOP(type, 0, savepv(label->op_type == OP_CONST
8b6b16e7 4006 ? SvPVx_nolen_const(((SVOP*)label)->op_sv)
cdaebead
MB		 4007 : ""));
4008 }
8990e307
LW		 4009 op_free(label);
4010 }
4011 else {
e3aba57a
RGS		 4012 /* Check whether it's going to be a goto &function */
4013 if (label->op_type == OP_ENTERSUB
4014 && !(label->op_flags & OPf_STACKED))
a0d0e21e 4015 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
11343788 4016 o = newUNOP(type, OPf_STACKED, label);
8990e307 4017 }
3280af22 4018 PL_hints |= HINT_BLOCK_SCOPE;
11343788 4019 return o;
8990e307
LW		 4020}
4021
7dafbf52
DM		 4022/*
4023=for apidoc cv_undef
4024
4025Clear out all the active components of a CV. This can happen either
4026by an explicit C<undef &foo>, or by the reference count going to zero.
4027In the former case, we keep the CvOUTSIDE pointer, so that any anonymous
4028children can still follow the full lexical scope chain.
4029
4030=cut
4031*/
4032
79072805 4033void
864dbfa3 4034Perl_cv_undef(pTHX_ CV *cv)
79072805 4035{
27da23d5 4036 dVAR;
a636914a 4037#ifdef USE_ITHREADS
35f1c1c7
SB		 4038 if (CvFILE(cv) && !CvXSUB(cv)) {
4039 /* for XSUBs CvFILE point directly to static memory; __FILE__ */
a636914a 4040 Safefree(CvFILE(cv));
a636914a 4041 }
f3e31eb5 4042 CvFILE(cv) = 0;
a636914a
RH		 4043#endif
4044
a0d0e21e
LW		 4045 if (!CvXSUB(cv) && CvROOT(cv)) {
4046 if (CvDEPTH(cv))
cea2e8a9 4047 Perl_croak(aTHX_ "Can't undef active subroutine");
8990e307 4048 ENTER;
a0d0e21e 4049
f3548bdc 4050 PAD_SAVE_SETNULLPAD();
a0d0e21e 4051
282f25c9 4052 op_free(CvROOT(cv));
79072805 4053 CvROOT(cv) = Nullop;
8f476eee 4054 CvSTART(cv) = Nullop;
8990e307 4055 LEAVE;
79072805 4056 }
1d5db326 4057 SvPOK_off((SV*)cv); /* forget prototype */
8e07c86e 4058 CvGV(cv) = Nullgv;
a3985cdc
DM		 4059
4060 pad_undef(cv);
4061
7dafbf52
DM		 4062 /* remove CvOUTSIDE unless this is an undef rather than a free */
4063 if (!SvREFCNT(cv) && CvOUTSIDE(cv)) {
4064 if (!CvWEAKOUTSIDE(cv))
4065 SvREFCNT_dec(CvOUTSIDE(cv));
4066 CvOUTSIDE(cv) = Nullcv;
4067 }
beab0874
JT		 4068 if (CvCONST(cv)) {
4069 SvREFCNT_dec((SV*)CvXSUBANY(cv).any_ptr);
4070 CvCONST_off(cv);
4071 }
50762d59
DM		 4072 if (CvXSUB(cv)) {
4073 CvXSUB(cv) = 0;
4074 }
7dafbf52
DM		 4075 /* delete all flags except WEAKOUTSIDE */
4076 CvFLAGS(cv) &= CVf_WEAKOUTSIDE;
79072805
LW		 4077}
4078
3fe9a6f1 4079void
35a4481c 4080Perl_cv_ckproto(pTHX_ const CV *cv, const GV *gv, const char *p)
3fe9a6f1 4081{
b15aece3 4082 if (((!p != !SvPOK(cv)) || (p && strNE(p, SvPVX_const(cv)))) && ckWARN_d(WARN_PROTOTYPE)) {
46fc3d4c 4083 SV* msg = sv_newmortal();
3fe9a6f1 4084 SV* name = Nullsv;
4085
4086 if (gv)
46fc3d4c 4087 gv_efullname3(name = sv_newmortal(), gv, Nullch);
4088 sv_setpv(msg, "Prototype mismatch:");
4089 if (name)
894356b3 4090 Perl_sv_catpvf(aTHX_ msg, " sub %"SVf, name);
3fe9a6f1 4091 if (SvPOK(cv))
e1ec3a88 4092 Perl_sv_catpvf(aTHX_ msg, " (%"SVf")", (const SV *)cv);
ebe643b9 4093 else
54667de8 4094 Perl_sv_catpv(aTHX_ msg, ": none");
46fc3d4c 4095 sv_catpv(msg, " vs ");
4096 if (p)
cea2e8a9 4097 Perl_sv_catpvf(aTHX_ msg, "(%s)", p);
46fc3d4c 4098 else
4099 sv_catpv(msg, "none");
9014280d 4100 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE), "%"SVf, msg);
3fe9a6f1 4101 }
4102}
4103
35f1c1c7
SB		 4104static void const_sv_xsub(pTHX_ CV* cv);
4105
beab0874 4106/*
ccfc67b7
JH		 4107
4108=head1 Optree Manipulation Functions
4109
beab0874
JT		 4110=for apidoc cv_const_sv
4111
4112If C<cv> is a constant sub eligible for inlining. returns the constant
4113value returned by the sub. Otherwise, returns NULL.
4114
4115Constant subs can be created with C<newCONSTSUB> or as described in
4116L<perlsub/"Constant Functions">.
4117
4118=cut
4119*/
760ac839 4120SV *
864dbfa3 4121Perl_cv_const_sv(pTHX_ CV *cv)
760ac839 4122{
beab0874 4123 if (!cv || !CvCONST(cv))
54310121 4124 return Nullsv;
beab0874 4125 return (SV*)CvXSUBANY(cv).any_ptr;
fe5e78ed 4126}
760ac839 4127
b5c19bd7
DM		 4128/* op_const_sv: examine an optree to determine whether it's in-lineable.
4129 * Can be called in 3 ways:
4130 *
4131 * !cv
4132 * look for a single OP_CONST with attached value: return the value
4133 *
4134 * cv && CvCLONE(cv) && !CvCONST(cv)
4135 *
4136 * examine the clone prototype, and if contains only a single
4137 * OP_CONST referencing a pad const, or a single PADSV referencing
4138 * an outer lexical, return a non-zero value to indicate the CV is
4139 * a candidate for "constizing" at clone time
4140 *
4141 * cv && CvCONST(cv)
4142 *
4143 * We have just cloned an anon prototype that was marked as a const
4144 * candidiate. Try to grab the current value, and in the case of
4145 * PADSV, ignore it if it has multiple references. Return the value.
4146 */
4147
fe5e78ed 4148SV *
6867be6d 4149Perl_op_const_sv(pTHX_ const OP *o, CV *cv)
fe5e78ed
GS		 4150{
4151 SV *sv = Nullsv;
4152
0f79a09d 4153 if (!o)
fe5e78ed 4154 return Nullsv;
1c846c1f
NIS		 4155
4156 if (o->op_type == OP_LINESEQ && cLISTOPo->op_first)
fe5e78ed
GS		 4157 o = cLISTOPo->op_first->op_sibling;
4158
4159 for (; o; o = o->op_next) {
54310121 4160 OPCODE type = o->op_type;
fe5e78ed 4161
1c846c1f 4162 if (sv && o->op_next == o)
fe5e78ed 4163 return sv;
e576b457
JT		 4164 if (o->op_next != o) {
4165 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
4166 continue;
4167 if (type == OP_DBSTATE)
4168 continue;
4169 }
54310121 4170 if (type == OP_LEAVESUB || type == OP_RETURN)
4171 break;
4172 if (sv)
4173 return Nullsv;
7766f137 4174 if (type == OP_CONST && cSVOPo->op_sv)
5dc0d613 4175 sv = cSVOPo->op_sv;
b5c19bd7 4176 else if (cv && type == OP_CONST) {
dd2155a4 4177 sv = PAD_BASE_SV(CvPADLIST(cv), o->op_targ);
beab0874
JT		 4178 if (!sv)
4179 return Nullsv;
b5c19bd7
DM		 4180 }
4181 else if (cv && type == OP_PADSV) {
4182 if (CvCONST(cv)) { /* newly cloned anon */
4183 sv = PAD_BASE_SV(CvPADLIST(cv), o->op_targ);
4184 /* the candidate should have 1 ref from this pad and 1 ref
4185 * from the parent */
4186 if (!sv || SvREFCNT(sv) != 2)
4187 return Nullsv;
beab0874 4188 sv = newSVsv(sv);
b5c19bd7
DM		 4189 SvREADONLY_on(sv);
4190 return sv;
4191 }
4192 else {
4193 if (PAD_COMPNAME_FLAGS(o->op_targ) & SVf_FAKE)
4194 sv = &PL_sv_undef; /* an arbitrary non-null value */
beab0874 4195 }
760ac839 4196 }
b5c19bd7 4197 else {
54310121 4198 return Nullsv;
b5c19bd7 4199 }
760ac839
LW		 4200 }
4201 return sv;
4202}
4203
09bef843
SB		 4204void
4205Perl_newMYSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
4206{
73d840c0 4207 (void)floor;
09bef843
SB		 4208 if (o)
4209 SAVEFREEOP(o);
4210 if (proto)
4211 SAVEFREEOP(proto);
4212 if (attrs)
4213 SAVEFREEOP(attrs);
4214 if (block)
4215 SAVEFREEOP(block);
4216 Perl_croak(aTHX_ "\"my sub\" not yet implemented");
4217}
4218
748a9306 4219CV *
864dbfa3 4220Perl_newSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *block)
79072805 4221{
09bef843
SB		 4222 return Perl_newATTRSUB(aTHX_ floor, o, proto, Nullop, block);
4223}
4224
4225CV *
4226Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
4227{
27da23d5 4228 dVAR;
6867be6d 4229 const char *aname;
83ee9e09 4230 GV *gv;
5c144d81 4231 const char *ps;
ea6e9374 4232 STRLEN ps_len;
a2008d6d 4233 register CV *cv=0;
beab0874 4234 SV *const_sv;
79072805 4235
8b6b16e7 4236 const char * const name = o ? SvPVx_nolen_const(cSVOPo->op_sv) : Nullch;
8e742a20
MHM		 4237
4238 if (proto) {
4239 assert(proto->op_type == OP_CONST);
5c144d81 4240 ps = SvPVx_const(((SVOP*)proto)->op_sv, ps_len);
8e742a20
MHM		 4241 }
4242 else
4243 ps = Nullch;
4244
83ee9e09
GS		 4245 if (!name && PERLDB_NAMEANON && CopLINE(PL_curcop)) {
4246 SV *sv = sv_newmortal();
c99da370
JH		 4247 Perl_sv_setpvf(aTHX_ sv, "%s[%s:%"IVdf"]",
4248 PL_curstash ? "__ANON__" : "__ANON__::__ANON__",
83ee9e09 4249 CopFILE(PL_curcop), (IV)CopLINE(PL_curcop));
b15aece3 4250 aname = SvPVX_const(sv);
83ee9e09
GS		 4251 }
4252 else
4253 aname = Nullch;
7a5fd60d
NC		 4254 gv = name ? gv_fetchsv(cSVOPo->op_sv,
4255 GV_ADDMULTI | ((block || attrs) ? 0 : GV_NOINIT),
4256 SVt_PVCV)
4257 : gv_fetchpv(aname ? aname
4258 : (PL_curstash ? "__ANON__" : "__ANON__::__ANON__"),
4259 GV_ADDMULTI | ((block || attrs) ? 0 : GV_NOINIT),
4260 SVt_PVCV);
83ee9e09 4261
11343788 4262 if (o)
5dc0d613 4263 SAVEFREEOP(o);
3fe9a6f1 4264 if (proto)
4265 SAVEFREEOP(proto);
09bef843
SB		 4266 if (attrs)
4267 SAVEFREEOP(attrs);
3fe9a6f1 4268
09bef843 4269 if (SvTYPE(gv) != SVt_PVGV) { /* Maybe prototype now, and had at
55d729e4
GS		 4270 maximum a prototype before. */
4271 if (SvTYPE(gv) > SVt_NULL) {
0453d815 4272 if (!SvPOK((SV*)gv) && !(SvIOK((SV*)gv) && SvIVX((SV*)gv) == -1)
e476b1b5 4273 && ckWARN_d(WARN_PROTOTYPE))
f248d071 4274 {
9014280d 4275 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE), "Runaway prototype");
f248d071 4276 }
55d729e4
GS		 4277 cv_ckproto((CV*)gv, NULL, ps);
4278 }
4279 if (ps)
ea6e9374 4280 sv_setpvn((SV*)gv, ps, ps_len);
55d729e4
GS		 4281 else
4282 sv_setiv((SV*)gv, -1);
3280af22
NIS		 4283 SvREFCNT_dec(PL_compcv);
4284 cv = PL_compcv = NULL;
4285 PL_sub_generation++;
beab0874 4286 goto done;
55d729e4
GS		 4287 }
4288
beab0874
JT		 4289 cv = (!name || GvCVGEN(gv)) ? Nullcv : GvCV(gv);
4290
7fb37951
AMS		 4291#ifdef GV_UNIQUE_CHECK
4292 if (cv && GvUNIQUE(gv) && SvREADONLY(cv)) {
4293 Perl_croak(aTHX_ "Can't define subroutine %s (GV is unique)", name);
5bd07a3d
DM		 4294 }
4295#endif
4296
beab0874
JT		 4297 if (!block || !ps || *ps || attrs)
4298 const_sv = Nullsv;
4299 else
4300 const_sv = op_const_sv(block, Nullcv);
4301
4302 if (cv) {
6867be6d 4303 const bool exists = CvROOT(cv) || CvXSUB(cv);
5bd07a3d 4304
7fb37951
AMS		 4305#ifdef GV_UNIQUE_CHECK
4306 if (exists && GvUNIQUE(gv)) {
4307 Perl_croak(aTHX_ "Can't redefine unique subroutine %s", name);
5bd07a3d
DM		 4308 }
4309#endif
4310
60ed1d8c
GS		 4311 /* if the subroutine doesn't exist and wasn't pre-declared
4312 * with a prototype, assume it will be AUTOLOADed,
4313 * skipping the prototype check
4314 */
4315 if (exists || SvPOK(cv))
01ec43d0 4316 cv_ckproto(cv, gv, ps);
68dc0745 4317 /* already defined (or promised)? */
60ed1d8c 4318 if (exists || GvASSUMECV(gv)) {
09bef843 4319 if (!block && !attrs) {
d3cea301
SB		 4320 if (CvFLAGS(PL_compcv)) {
4321 /* might have had built-in attrs applied */
4322 CvFLAGS(cv) |= (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS);
4323 }
aa689395 4324 /* just a "sub foo;" when &foo is already defined */
3280af22 4325 SAVEFREESV(PL_compcv);
aa689395 4326 goto done;
4327 }
7bac28a0 4328 /* ahem, death to those who redefine active sort subs */
3280af22 4329 if (PL_curstackinfo->si_type == PERLSI_SORT && PL_sortcop == CvSTART(cv))
cea2e8a9 4330 Perl_croak(aTHX_ "Can't redefine active sort subroutine %s", name);
beab0874
JT		 4331 if (block) {
4332 if (ckWARN(WARN_REDEFINE)
4333 || (CvCONST(cv)
4334 && (!const_sv || sv_cmp(cv_const_sv(cv), const_sv))))
4335 {
6867be6d 4336 const line_t oldline = CopLINE(PL_curcop);
d8a34499
IK		 4337 if (PL_copline != NOLINE)
4338 CopLINE_set(PL_curcop, PL_copline);
9014280d 4339 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
beab0874
JT		 4340 CvCONST(cv) ? "Constant subroutine %s redefined"
4341 : "Subroutine %s redefined", name);
4342 CopLINE_set(PL_curcop, oldline);
4343 }
4344 SvREFCNT_dec(cv);
4345 cv = Nullcv;
79072805 4346 }
79072805
LW		 4347 }
4348 }
beab0874 4349 if (const_sv) {
7fc63493 4350 (void)SvREFCNT_inc(const_sv);
beab0874 4351 if (cv) {
0768512c 4352 assert(!CvROOT(cv) && !CvCONST(cv));
c69006e4 4353 sv_setpvn((SV*)cv, "", 0); /* prototype is "" */
beab0874
JT		 4354 CvXSUBANY(cv).any_ptr = const_sv;
4355 CvXSUB(cv) = const_sv_xsub;
4356 CvCONST_on(cv);
beab0874
JT		 4357 }
4358 else {
4359 GvCV(gv) = Nullcv;
4360 cv = newCONSTSUB(NULL, name, const_sv);
4361 }
4362 op_free(block);
4363 SvREFCNT_dec(PL_compcv);
4364 PL_compcv = NULL;
4365 PL_sub_generation++;
4366 goto done;
4367 }
09bef843
SB		 4368 if (attrs) {
4369 HV *stash;
4370 SV *rcv;
4371
4372 /* Need to do a C<use attributes $stash_of_cv,\&cv,@attrs>
4373 * before we clobber PL_compcv.
4374 */
4375 if (cv && !block) {
4376 rcv = (SV*)cv;
020f0e03
SB		 4377 /* Might have had built-in attributes applied -- propagate them. */
4378 CvFLAGS(cv) |= (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS);
a9164de8 4379 if (CvGV(cv) && GvSTASH(CvGV(cv)))
09bef843 4380 stash = GvSTASH(CvGV(cv));
a9164de8 4381 else if (CvSTASH(cv))
09bef843
SB		 4382 stash = CvSTASH(cv);
4383 else
4384 stash = PL_curstash;
4385 }
4386 else {
4387 /* possibly about to re-define existing subr -- ignore old cv */
4388 rcv = (SV*)PL_compcv;
a9164de8 4389 if (name && GvSTASH(gv))
09bef843
SB		 4390 stash = GvSTASH(gv);
4391 else
4392 stash = PL_curstash;
4393 }
95f0a2f1 4394 apply_attrs(stash, rcv, attrs, FALSE);
09bef843 4395 }
a0d0e21e 4396 if (cv) { /* must reuse cv if autoloaded */
09bef843
SB		 4397 if (!block) {
4398 /* got here with just attrs -- work done, so bug out */
4399 SAVEFREESV(PL_compcv);
4400 goto done;
4401 }
a3985cdc 4402 /* transfer PL_compcv to cv */
4633a7c4 4403 cv_undef(cv);
3280af22 4404 CvFLAGS(cv) = CvFLAGS(PL_compcv);
5c41a5fa
DM		 4405 if (!CvWEAKOUTSIDE(cv))
4406 SvREFCNT_dec(CvOUTSIDE(cv));
3280af22 4407 CvOUTSIDE(cv) = CvOUTSIDE(PL_compcv);
a3985cdc 4408 CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(PL_compcv);
3280af22
NIS		 4409 CvOUTSIDE(PL_compcv) = 0;
4410 CvPADLIST(cv) = CvPADLIST(PL_compcv);
4411 CvPADLIST(PL_compcv) = 0;
282f25c9 4412 /* inner references to PL_compcv must be fixed up ... */
dd2155a4 4413 pad_fixup_inner_anons(CvPADLIST(cv), PL_compcv, cv);
282f25c9 4414 /* ... before we throw it away */
3280af22 4415 SvREFCNT_dec(PL_compcv);
b5c19bd7 4416 PL_compcv = cv;
a933f601
IZ		 4417 if (PERLDB_INTER)/* Advice debugger on the new sub. */
4418 ++PL_sub_generation;
a0d0e21e
LW		 4419 }
4420 else {
3280af22 4421 cv = PL_compcv;
44a8e56a 4422 if (name) {
4423 GvCV(gv) = cv;
4424 GvCVGEN(gv) = 0;
3280af22 4425 PL_sub_generation++;
44a8e56a 4426 }
a0d0e21e 4427 }
65c50114 4428 CvGV(cv) = gv;
a636914a 4429 CvFILE_set_from_cop(cv, PL_curcop);
3280af22 4430 CvSTASH(cv) = PL_curstash;
8990e307 4431
3fe9a6f1 4432 if (ps)
ea6e9374 4433 sv_setpvn((SV*)cv, ps, ps_len);
4633a7c4 4434
3280af22 4435 if (PL_error_count) {
c07a80fd 4436 op_free(block);
4437 block = Nullop;
68dc0745 4438 if (name) {
6867be6d 4439 const char *s = strrchr(name, ':');
68dc0745 4440 s = s ? s+1 : name;
6d4c2119 4441 if (strEQ(s, "BEGIN")) {
e1ec3a88 4442 const char not_safe[] =
6d4c2119 4443 "BEGIN not safe after errors--compilation aborted";
faef0170 4444 if (PL_in_eval & EVAL_KEEPERR)
cea2e8a9 4445 Perl_croak(aTHX_ not_safe);
6d4c2119
CS		 4446 else {
4447 /* force display of errors found but not reported */
38a03e6e 4448 sv_catpv(ERRSV, not_safe);
35c1215d 4449 Perl_croak(aTHX_ "%"SVf, ERRSV);
6d4c2119
CS		 4450 }
4451 }
68dc0745 4452 }
c07a80fd 4453 }
beab0874
JT		 4454 if (!block)
4455 goto done;
a0d0e21e 4456
7766f137 4457 if (CvLVALUE(cv)) {
78f9721b
SM		 4458 CvROOT(cv) = newUNOP(OP_LEAVESUBLV, 0,
4459 mod(scalarseq(block), OP_LEAVESUBLV));
7766f137
GS		 4460 }
4461 else {
09c2fd24
AE		 4462 /* This makes sub {}; work as expected. */
4463 if (block->op_type == OP_STUB) {
4464 op_free(block);
4465 block = newSTATEOP(0, Nullch, 0);
4466 }
7766f137
GS		 4467 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
4468 }
4469 CvROOT(cv)->op_private |= OPpREFCOUNTED;
4470 OpREFCNT_set(CvROOT(cv), 1);
4471 CvSTART(cv) = LINKLIST(CvROOT(cv));
4472 CvROOT(cv)->op_next = 0;
a2efc822 4473 CALL_PEEP(CvSTART(cv));
7766f137
GS		 4474
4475 /* now that optimizer has done its work, adjust pad values */
54310121 4476
dd2155a4
DM		 4477 pad_tidy(CvCLONE(cv) ? padtidy_SUBCLONE : padtidy_SUB);
4478
4479 if (CvCLONE(cv)) {
beab0874
JT		 4480 assert(!CvCONST(cv));
4481 if (ps && !*ps && op_const_sv(block, cv))
4482 CvCONST_on(cv);
a0d0e21e 4483 }
79072805 4484
83ee9e09 4485 if (name || aname) {
6867be6d
AL		 4486 const char *s;
4487 const char *tname = (name ? name : aname);
44a8e56a 4488
3280af22 4489 if (PERLDB_SUBLINE && PL_curstash != PL_debstash) {
46fc3d4c 4490 SV *sv = NEWSV(0,0);
44a8e56a 4491 SV *tmpstr = sv_newmortal();
549bb64a 4492 GV *db_postponed = gv_fetchpv("DB::postponed", GV_ADDMULTI, SVt_PVHV);
83ee9e09 4493 CV *pcv;
44a8e56a 4494 HV *hv;
4495
ed094faf
GS		 4496 Perl_sv_setpvf(aTHX_ sv, "%s:%ld-%ld",
4497 CopFILE(PL_curcop),
cc49e20b 4498 (long)PL_subline, (long)CopLINE(PL_curcop));
44a8e56a 4499 gv_efullname3(tmpstr, gv, Nullch);
b15aece3 4500 hv_store(GvHV(PL_DBsub), SvPVX_const(tmpstr), SvCUR(tmpstr), sv, 0);
44a8e56a 4501 hv = GvHVn(db_postponed);
b15aece3 4502 if (HvFILL(hv) > 0 && hv_exists(hv, SvPVX_const(tmpstr), SvCUR(tmpstr))
83ee9e09
GS		 4503 && (pcv = GvCV(db_postponed)))
4504 {
44a8e56a 4505 dSP;
924508f0 4506 PUSHMARK(SP);
44a8e56a 4507 XPUSHs(tmpstr);
4508 PUTBACK;
83ee9e09 4509 call_sv((SV*)pcv, G_DISCARD);
44a8e56a 4510 }
4511 }
79072805 4512
83ee9e09 4513 if ((s = strrchr(tname,':')))
28757baa 4514 s++;
4515 else
83ee9e09 4516 s = tname;
ed094faf 4517
7d30b5c4 4518 if (*s != 'B' && *s != 'E' && *s != 'C' && *s != 'I')
ed094faf
GS		 4519 goto done;
4520
7678c486 4521 if (strEQ(s, "BEGIN") && !PL_error_count) {
6867be6d 4522 const I32 oldscope = PL_scopestack_ix;
28757baa 4523 ENTER;
57843af0
GS		 4524 SAVECOPFILE(&PL_compiling);
4525 SAVECOPLINE(&PL_compiling);
28757baa 4526
3280af22
NIS		 4527 if (!PL_beginav)
4528 PL_beginav = newAV();
28757baa 4529 DEBUG_x( dump_sub(gv) );
ea2f84a3
GS		 4530 av_push(PL_beginav, (SV*)cv);
4531 GvCV(gv) = 0; /* cv has been hijacked */
3280af22 4532 call_list(oldscope, PL_beginav);
a6006777 4533
3280af22 4534 PL_curcop = &PL_compiling;
eb160463 4535 PL_compiling.op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
28757baa 4536 LEAVE;
4537 }
3280af22
NIS		 4538 else if (strEQ(s, "END") && !PL_error_count) {
4539 if (!PL_endav)
4540 PL_endav = newAV();
ed094faf 4541 DEBUG_x( dump_sub(gv) );
3280af22 4542 av_unshift(PL_endav, 1);
ea2f84a3
GS		 4543 av_store(PL_endav, 0, (SV*)cv);
4544 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 4545 }
7d30b5c4
GS		 4546 else if (strEQ(s, "CHECK") && !PL_error_count) {
4547 if (!PL_checkav)
4548 PL_checkav = newAV();
ed094faf 4549 DEBUG_x( dump_sub(gv) );
ddda08b7 4550 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 4551 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run CHECK block");
7d30b5c4 4552 av_unshift(PL_checkav, 1);
ea2f84a3
GS		 4553 av_store(PL_checkav, 0, (SV*)cv);
4554 GvCV(gv) = 0; /* cv has been hijacked */
4f25aa18 4555 }
3280af22
NIS		 4556 else if (strEQ(s, "INIT") && !PL_error_count) {
4557 if (!PL_initav)
4558 PL_initav = newAV();
ed094faf 4559 DEBUG_x( dump_sub(gv) );
ddda08b7 4560 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 4561 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run INIT block");
ea2f84a3
GS		 4562 av_push(PL_initav, (SV*)cv);
4563 GvCV(gv) = 0; /* cv has been hijacked */
ae77835f 4564 }
79072805 4565 }
a6006777 4566
aa689395 4567 done:
3280af22 4568 PL_copline = NOLINE;
8990e307 4569 LEAVE_SCOPE(floor);
a0d0e21e 4570 return cv;
79072805
LW		 4571}
4572
b099ddc0 4573/* XXX unsafe for threads if eval_owner isn't held */
954c1994
GS		 4574/*
4575=for apidoc newCONSTSUB
4576
4577Creates a constant sub equivalent to Perl C<sub FOO () { 123 }> which is
4578eligible for inlining at compile-time.
4579
4580=cut
4581*/
4582
beab0874 4583CV *
e1ec3a88 4584Perl_newCONSTSUB(pTHX_ HV *stash, const char *name, SV *sv)
5476c433 4585{
27da23d5 4586 dVAR;
beab0874 4587 CV* cv;
5476c433 4588
11faa288 4589 ENTER;
11faa288 4590
f4dd75d9 4591 SAVECOPLINE(PL_curcop);
11faa288 4592 CopLINE_set(PL_curcop, PL_copline);
f4dd75d9
GS		 4593
4594 SAVEHINTS();
3280af22 4595 PL_hints &= ~HINT_BLOCK_SCOPE;
11faa288
GS		 4596
4597 if (stash) {
4598 SAVESPTR(PL_curstash);
4599 SAVECOPSTASH(PL_curcop);
4600 PL_curstash = stash;
05ec9bb3 4601 CopSTASH_set(PL_curcop,stash);
11faa288 4602 }
5476c433 4603
91a15d0d 4604 cv = newXS(name, const_sv_xsub, savepv(CopFILE(PL_curcop)));
beab0874
JT		 4605 CvXSUBANY(cv).any_ptr = sv;
4606 CvCONST_on(cv);
c69006e4 4607 sv_setpvn((SV*)cv, "", 0); /* prototype is "" */
5476c433 4608
02f28d44
MHM		 4609 if (stash)
4610 CopSTASH_free(PL_curcop);
4611
11faa288 4612 LEAVE;
beab0874
JT		 4613
4614 return cv;
5476c433
JD		 4615}
4616
954c1994
GS		 4617/*
4618=for apidoc U||newXS
4619
4620Used by C<xsubpp> to hook up XSUBs as Perl subs.
4621
4622=cut
4623*/
4624
57d3b86d 4625CV *
bfed75c6 4626Perl_newXS(pTHX_ const char *name, XSUBADDR_t subaddr, const char *filename)
a0d0e21e 4627{
c99da370
JH		 4628 GV *gv = gv_fetchpv(name ? name :
4629 (PL_curstash ? "__ANON__" : "__ANON__::__ANON__"),
4630 GV_ADDMULTI, SVt_PVCV);
79072805 4631 register CV *cv;
44a8e56a 4632
1ecdd9a8
HS		 4633 if (!subaddr)
4634 Perl_croak(aTHX_ "panic: no address for '%s' in '%s'", name, filename);
4635
155aba94 4636 if ((cv = (name ? GvCV(gv) : Nullcv))) {
44a8e56a 4637 if (GvCVGEN(gv)) {
4638 /* just a cached method */
4639 SvREFCNT_dec(cv);
66a1b24b 4640 cv = Nullcv;
44a8e56a 4641 }
4642 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
4643 /* already defined (or promised) */
1df70142 4644 /* XXX It's possible for this HvNAME_get to return null, and get passed into strEQ */
66a1b24b
AL		 4645 if (ckWARN(WARN_REDEFINE)) {
4646 GV * const gvcv = CvGV(cv);
4647 if (gvcv) {
4648 HV * const stash = GvSTASH(gvcv);
4649 if (stash) {
4650 const char *name = HvNAME_get(stash);
4651 if ( strEQ(name,"autouse") ) {
4652 const line_t oldline = CopLINE(PL_curcop);
4653 if (PL_copline != NOLINE)
4654 CopLINE_set(PL_curcop, PL_copline);
4655 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
4656 CvCONST(cv) ? "Constant subroutine %s redefined"
4657 : "Subroutine %s redefined"
4658 ,name);
4659 CopLINE_set(PL_curcop, oldline);
4660 }
4661 }
4662 }
a0d0e21e
LW		 4663 }
4664 SvREFCNT_dec(cv);
66a1b24b 4665 cv = Nullcv;
79072805 4666 }
79072805 4667 }
44a8e56a 4668
4669 if (cv) /* must reuse cv if autoloaded */
4670 cv_undef(cv);
a0d0e21e
LW		 4671 else {
4672 cv = (CV*)NEWSV(1105,0);
4673 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 4674 if (name) {
4675 GvCV(gv) = cv;
4676 GvCVGEN(gv) = 0;
3280af22 4677 PL_sub_generation++;
44a8e56a 4678 }
a0d0e21e 4679 }
65c50114 4680 CvGV(cv) = gv;
b195d487 4681 (void)gv_fetchfile(filename);
dd374669 4682 CvFILE(cv) = (char *)filename; /* NOTE: not copied, as it is expected to be
57843af0 4683 an external constant string */
a0d0e21e 4684 CvXSUB(cv) = subaddr;
44a8e56a 4685
28757baa 4686 if (name) {
e1ec3a88 4687 const char *s = strrchr(name,':');
28757baa 4688 if (s)
4689 s++;
4690 else
4691 s = name;
ed094faf 4692
7d30b5c4 4693 if (*s != 'B' && *s != 'E' && *s != 'C' && *s != 'I')
ed094faf
GS		 4694 goto done;
4695
28757baa 4696 if (strEQ(s, "BEGIN")) {
3280af22
NIS		 4697 if (!PL_beginav)
4698 PL_beginav = newAV();
ea2f84a3
GS		 4699 av_push(PL_beginav, (SV*)cv);
4700 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 4701 }
4702 else if (strEQ(s, "END")) {
3280af22
NIS		 4703 if (!PL_endav)
4704 PL_endav = newAV();
4705 av_unshift(PL_endav, 1);
ea2f84a3
GS		 4706 av_store(PL_endav, 0, (SV*)cv);
4707 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 4708 }
7d30b5c4
GS		 4709 else if (strEQ(s, "CHECK")) {
4710 if (!PL_checkav)
4711 PL_checkav = newAV();
ddda08b7 4712 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 4713 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run CHECK block");
7d30b5c4 4714 av_unshift(PL_checkav, 1);
ea2f84a3
GS		 4715 av_store(PL_checkav, 0, (SV*)cv);
4716 GvCV(gv) = 0; /* cv has been hijacked */
4f25aa18 4717 }
7d07dbc2 4718 else if (strEQ(s, "INIT")) {
3280af22
NIS		 4719 if (!PL_initav)
4720 PL_initav = newAV();
ddda08b7 4721 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 4722 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run INIT block");
ea2f84a3
GS		 4723 av_push(PL_initav, (SV*)cv);
4724 GvCV(gv) = 0; /* cv has been hijacked */
ae77835f 4725 }
28757baa 4726 }
8990e307 4727 else
a5f75d66 4728 CvANON_on(cv);
44a8e56a 4729
ed094faf 4730done:
a0d0e21e 4731 return cv;
79072805
LW		 4732}
4733
4734void
864dbfa3 4735Perl_newFORM(pTHX_ I32 floor, OP *o, OP *block)
79072805
LW		 4736{
4737 register CV *cv;
79072805 4738 GV *gv;
79072805 4739
11343788 4740 if (o)
7a5fd60d 4741 gv = gv_fetchsv(cSVOPo->op_sv, TRUE, SVt_PVFM);
79072805 4742 else
7a5fd60d
NC		 4743 gv = gv_fetchpv("STDOUT", TRUE, SVt_PVFM);
4744
7fb37951
AMS		 4745#ifdef GV_UNIQUE_CHECK
4746 if (GvUNIQUE(gv)) {
4747 Perl_croak(aTHX_ "Bad symbol for form (GV is unique)");
5bd07a3d
DM		 4748 }
4749#endif
a5f75d66 4750 GvMULTI_on(gv);
155aba94 4751 if ((cv = GvFORM(gv))) {
599cee73 4752 if (ckWARN(WARN_REDEFINE)) {
6867be6d 4753 const line_t oldline = CopLINE(PL_curcop);
d8a34499
IK		 4754 if (PL_copline != NOLINE)
4755 CopLINE_set(PL_curcop, PL_copline);
7a5fd60d
NC		 4756 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
4757 o ? "Format %"SVf" redefined"
4758 : "Format STDOUT redefined" ,cSVOPo->op_sv);
57843af0 4759 CopLINE_set(PL_curcop, oldline);
79072805 4760 }
8990e307 4761 SvREFCNT_dec(cv);
79072805 4762 }
3280af22 4763 cv = PL_compcv;
79072805 4764 GvFORM(gv) = cv;
65c50114 4765 CvGV(cv) = gv;
a636914a 4766 CvFILE_set_from_cop(cv, PL_curcop);
79072805 4767
a0d0e21e 4768
dd2155a4 4769 pad_tidy(padtidy_FORMAT);
79072805 4770 CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
7934575e
GS		 4771 CvROOT(cv)->op_private |= OPpREFCOUNTED;
4772 OpREFCNT_set(CvROOT(cv), 1);
79072805
LW		 4773 CvSTART(cv) = LINKLIST(CvROOT(cv));
4774 CvROOT(cv)->op_next = 0;
a2efc822 4775 CALL_PEEP(CvSTART(cv));
11343788 4776 op_free(o);
3280af22 4777 PL_copline = NOLINE;
8990e307 4778 LEAVE_SCOPE(floor);
79072805
LW		 4779}
4780
4781OP *
864dbfa3 4782Perl_newANONLIST(pTHX_ OP *o)
79072805 4783{
93a17b20 4784 return newUNOP(OP_REFGEN, 0,
11343788 4785 mod(list(convert(OP_ANONLIST, 0, o)), OP_REFGEN));
79072805
LW		 4786}
4787
4788OP *
864dbfa3 4789Perl_newANONHASH(pTHX_ OP *o)
79072805 4790{
93a17b20 4791 return newUNOP(OP_REFGEN, 0,
11343788 4792 mod(list(convert(OP_ANONHASH, 0, o)), OP_REFGEN));
a0d0e21e
LW		 4793}
4794
4795OP *
864dbfa3 4796Perl_newANONSUB(pTHX_ I32 floor, OP *proto, OP *block)
a0d0e21e 4797{
09bef843
SB		 4798 return newANONATTRSUB(floor, proto, Nullop, block);
4799}
4800
4801OP *
4802Perl_newANONATTRSUB(pTHX_ I32 floor, OP *proto, OP *attrs, OP *block)
4803{
a0d0e21e 4804 return newUNOP(OP_REFGEN, 0,
09bef843
SB		 4805 newSVOP(OP_ANONCODE, 0,
4806 (SV*)newATTRSUB(floor, 0, proto, attrs, block)));
79072805
LW		 4807}
4808
4809OP *
864dbfa3 4810Perl_oopsAV(pTHX_ OP *o)
79072805 4811{
27da23d5 4812 dVAR;
ed6116ce
LW		 4813 switch (o->op_type) {
4814 case OP_PADSV:
4815 o->op_type = OP_PADAV;
22c35a8c 4816 o->op_ppaddr = PL_ppaddr[OP_PADAV];
51e247a3 4817 return ref(o, OP_RV2AV);
b2ffa427 4818
ed6116ce 4819 case OP_RV2SV:
79072805 4820 o->op_type = OP_RV2AV;
22c35a8c 4821 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
79072805 4822 ref(o, OP_RV2AV);
ed6116ce
LW		 4823 break;
4824
4825 default:
0453d815 4826 if (ckWARN_d(WARN_INTERNAL))
9014280d 4827 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "oops: oopsAV");
ed6116ce
LW		 4828 break;
4829 }
79072805
LW		 4830 return o;
4831}
4832
4833OP *
864dbfa3 4834Perl_oopsHV(pTHX_ OP *o)
79072805 4835{
27da23d5 4836 dVAR;
ed6116ce
LW		 4837 switch (o->op_type) {
4838 case OP_PADSV:
4839 case OP_PADAV:
4840 o->op_type = OP_PADHV;
22c35a8c 4841 o->op_ppaddr = PL_ppaddr[OP_PADHV];
51e247a3 4842 return ref(o, OP_RV2HV);
ed6116ce
LW		 4843
4844 case OP_RV2SV:
4845 case OP_RV2AV:
79072805 4846 o->op_type = OP_RV2HV;
22c35a8c 4847 o->op_ppaddr = PL_ppaddr[OP_RV2HV];
79072805 4848 ref(o, OP_RV2HV);
ed6116ce
LW		 4849 break;
4850
4851 default:
0453d815 4852 if (ckWARN_d(WARN_INTERNAL))
9014280d 4853 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "oops: oopsHV");
ed6116ce
LW		 4854 break;
4855 }
79072805
LW		 4856 return o;
4857}
4858
4859OP *
864dbfa3 4860Perl_newAVREF(pTHX_ OP *o)
79072805 4861{
27da23d5 4862 dVAR;
ed6116ce
LW		 4863 if (o->op_type == OP_PADANY) {
4864 o->op_type = OP_PADAV;
22c35a8c 4865 o->op_ppaddr = PL_ppaddr[OP_PADAV];
93a17b20 4866 return o;
ed6116ce 4867 }
a1063b2d 4868 else if ((o->op_type == OP_RV2AV || o->op_type == OP_PADAV)
9014280d
PM		 4869 && ckWARN(WARN_DEPRECATED)) {
4870 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
a1063b2d
RH		 4871 "Using an array as a reference is deprecated");
4872 }
79072805
LW		 4873 return newUNOP(OP_RV2AV, 0, scalar(o));
4874}
4875
4876OP *
864dbfa3 4877Perl_newGVREF(pTHX_ I32 type, OP *o)
79072805 4878{
82092f1d 4879 if (type == OP_MAPSTART || type == OP_GREPSTART || type == OP_SORT)
a0d0e21e 4880 return newUNOP(OP_NULL, 0, o);
748a9306 4881 return ref(newUNOP(OP_RV2GV, OPf_REF, o), type);
79072805
LW		 4882}
4883
4884OP *
864dbfa3 4885Perl_newHVREF(pTHX_ OP *o)
79072805 4886{
27da23d5 4887 dVAR;
ed6116ce
LW		 4888 if (o->op_type == OP_PADANY) {
4889 o->op_type = OP_PADHV;
22c35a8c 4890 o->op_ppaddr = PL_ppaddr[OP_PADHV];
93a17b20 4891 return o;
ed6116ce 4892 }
a1063b2d 4893 else if ((o->op_type == OP_RV2HV || o->op_type == OP_PADHV)
9014280d
PM		 4894 && ckWARN(WARN_DEPRECATED)) {
4895 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
a1063b2d
RH		 4896 "Using a hash as a reference is deprecated");
4897 }
79072805
LW		 4898 return newUNOP(OP_RV2HV, 0, scalar(o));
4899}
4900
4901OP *
864dbfa3 4902Perl_oopsCV(pTHX_ OP *o)
79072805 4903{
cea2e8a9 4904 Perl_croak(aTHX_ "NOT IMPL LINE %d",__LINE__);
79072805 4905 /* STUB */
73d840c0 4906 (void)o;
0dbb1585 4907 NORETURN_FUNCTION_END;
79072805
LW		 4908}
4909
4910OP *
864dbfa3 4911Perl_newCVREF(pTHX_ I32 flags, OP *o)
79072805 4912{
c07a80fd 4913 return newUNOP(OP_RV2CV, flags, scalar(o));
79072805
LW		 4914}
4915
4916OP *
864dbfa3 4917Perl_newSVREF(pTHX_ OP *o)
79072805 4918{
27da23d5 4919 dVAR;
ed6116ce
LW		 4920 if (o->op_type == OP_PADANY) {
4921 o->op_type = OP_PADSV;
22c35a8c 4922 o->op_ppaddr = PL_ppaddr[OP_PADSV];
93a17b20 4923 return o;
ed6116ce 4924 }
224a4551
MB		 4925 else if (o->op_type == OP_THREADSV && !(o->op_flags & OPpDONE_SVREF)) {
4926 o->op_flags |= OPpDONE_SVREF;
a863c7d1 4927 return o;
224a4551 4928 }
79072805
LW		 4929 return newUNOP(OP_RV2SV, 0, scalar(o));
4930}
4931
61b743bb
DM		 4932/* Check routines. See the comments at the top of this file for details
4933 * on when these are called */
79072805
LW		 4934
4935OP *
cea2e8a9 4936Perl_ck_anoncode(pTHX_ OP *o)
5f05dabc 4937{
dd2155a4 4938 cSVOPo->op_targ = pad_add_anon(cSVOPo->op_sv, o->op_type);
5dc0d613 4939 cSVOPo->op_sv = Nullsv;
5dc0d613 4940 return o;
5f05dabc 4941}
4942
4943OP *
cea2e8a9 4944Perl_ck_bitop(pTHX_ OP *o)
55497cff 4945{
276b2a0c
RGS		 4946#define OP_IS_NUMCOMPARE(op) \
4947 ((op) == OP_LT || (op) == OP_I_LT || \
4948 (op) == OP_GT || (op) == OP_I_GT || \
4949 (op) == OP_LE || (op) == OP_I_LE || \
4950 (op) == OP_GE || (op) == OP_I_GE || \
4951 (op) == OP_EQ || (op) == OP_I_EQ || \
4952 (op) == OP_NE || (op) == OP_I_NE || \
4953 (op) == OP_NCMP || (op) == OP_I_NCMP)
eb160463 4954 o->op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
2b84528b
RGS		 4955 if (!(o->op_flags & OPf_STACKED) /* Not an assignment */
4956 && (o->op_type == OP_BIT_OR
4957 || o->op_type == OP_BIT_AND
4958 || o->op_type == OP_BIT_XOR))
276b2a0c 4959 {
1df70142
AL		 4960 const OP * const left = cBINOPo->op_first;
4961 const OP * const right = left->op_sibling;
96a925ab
YST		 4962 if ((OP_IS_NUMCOMPARE(left->op_type) &&
4963 (left->op_flags & OPf_PARENS) == 0) ||
4964 (OP_IS_NUMCOMPARE(right->op_type) &&
4965 (right->op_flags & OPf_PARENS) == 0))
276b2a0c
RGS		 4966 if (ckWARN(WARN_PRECEDENCE))
4967 Perl_warner(aTHX_ packWARN(WARN_PRECEDENCE),
4968 "Possible precedence problem on bitwise %c operator",
4969 o->op_type == OP_BIT_OR ? '|'
4970 : o->op_type == OP_BIT_AND ? '&' : '^'
4971 );
4972 }
5dc0d613 4973 return o;
55497cff 4974}
4975
4976OP *
cea2e8a9 4977Perl_ck_concat(pTHX_ OP *o)
79072805 4978{
6867be6d 4979 const OP *kid = cUNOPo->op_first;
df91b2c5
AE		 4980 if (kid->op_type == OP_CONCAT && !(kid->op_private & OPpTARGET_MY) &&
4981 !(kUNOP->op_first->op_flags & OPf_MOD))
0165acc7 4982 o->op_flags |= OPf_STACKED;
11343788 4983 return o;
79072805
LW		 4984}
4985
4986OP *
cea2e8a9 4987Perl_ck_spair(pTHX_ OP *o)
79072805 4988{
27da23d5 4989 dVAR;
11343788 4990 if (o->op_flags & OPf_KIDS) {
79072805 4991 OP* newop;
a0d0e21e 4992 OP* kid;
6867be6d 4993 const OPCODE type = o->op_type;
5dc0d613 4994 o = modkids(ck_fun(o), type);
11343788 4995 kid = cUNOPo->op_first;
a0d0e21e
LW		 4996 newop = kUNOP->op_first->op_sibling;
4997 if (newop &&
4998 (newop->op_sibling ||
22c35a8c 4999 !(PL_opargs[newop->op_type] & OA_RETSCALAR) ||
a0d0e21e
LW		 5000 newop->op_type == OP_PADAV || newop->op_type == OP_PADHV ||
5001 newop->op_type == OP_RV2AV || newop->op_type == OP_RV2HV)) {
b2ffa427 5002
11343788 5003 return o;
a0d0e21e
LW		 5004 }
5005 op_free(kUNOP->op_first);
5006 kUNOP->op_first = newop;
5007 }
22c35a8c 5008 o->op_ppaddr = PL_ppaddr[++o->op_type];
11343788 5009 return ck_fun(o);
a0d0e21e
LW		 5010}
5011
5012OP *
cea2e8a9 5013Perl_ck_delete(pTHX_ OP *o)
a0d0e21e 5014{
11343788 5015 o = ck_fun(o);
5dc0d613 5016 o->op_private = 0;
11343788
MB		 5017 if (o->op_flags & OPf_KIDS) {
5018 OP *kid = cUNOPo->op_first;
01020589
GS		 5019 switch (kid->op_type) {
5020 case OP_ASLICE:
5021 o->op_flags |= OPf_SPECIAL;
5022 /* FALL THROUGH */
5023 case OP_HSLICE:
5dc0d613 5024 o->op_private |= OPpSLICE;
01020589
GS		 5025 break;
5026 case OP_AELEM:
5027 o->op_flags |= OPf_SPECIAL;
5028 /* FALL THROUGH */
5029 case OP_HELEM:
5030 break;
5031 default:
5032 Perl_croak(aTHX_ "%s argument is not a HASH or ARRAY element or slice",
53e06cf0 5033 OP_DESC(o));
01020589 5034 }
93c66552 5035 op_null(kid);
79072805 5036 }
11343788 5037 return o;
79072805
LW		 5038}
5039
5040OP *
96e176bf
CL		 5041Perl_ck_die(pTHX_ OP *o)
5042{
5043#ifdef VMS
5044 if (VMSISH_HUSHED) o->op_private |= OPpHUSH_VMSISH;
5045#endif
5046 return ck_fun(o);
5047}
5048
5049OP *
cea2e8a9 5050Perl_ck_eof(pTHX_ OP *o)
79072805 5051{
6867be6d 5052 const I32 type = o->op_type;
79072805 5053
11343788
MB		 5054 if (o->op_flags & OPf_KIDS) {
5055 if (cLISTOPo->op_first->op_type == OP_STUB) {
5056 op_free(o);
8fde6460 5057 o = newUNOP(type, OPf_SPECIAL, newGVOP(OP_GV, 0, PL_argvgv));
8990e307 5058 }
11343788 5059 return ck_fun(o);
79072805 5060 }
11343788 5061 return o;
79072805
LW		 5062}
5063
5064OP *
cea2e8a9 5065Perl_ck_eval(pTHX_ OP *o)
79072805 5066{
27da23d5 5067 dVAR;
3280af22 5068 PL_hints |= HINT_BLOCK_SCOPE;
11343788
MB		 5069 if (o->op_flags & OPf_KIDS) {
5070 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 5071
93a17b20 5072 if (!kid) {
11343788 5073 o->op_flags &= ~OPf_KIDS;
93c66552 5074 op_null(o);
79072805 5075 }
b14574b4 5076 else if (kid->op_type == OP_LINESEQ || kid->op_type == OP_STUB) {
79072805
LW		 5077 LOGOP *enter;
5078
11343788
MB		 5079 cUNOPo->op_first = 0;
5080 op_free(o);
79072805 5081
b7dc083c 5082 NewOp(1101, enter, 1, LOGOP);
79072805 5083 enter->op_type = OP_ENTERTRY;
22c35a8c 5084 enter->op_ppaddr = PL_ppaddr[OP_ENTERTRY];
79072805
LW		 5085 enter->op_private = 0;
5086
5087 /* establish postfix order */
5088 enter->op_next = (OP*)enter;
5089
11343788
MB		 5090 o = prepend_elem(OP_LINESEQ, (OP*)enter, (OP*)kid);
5091 o->op_type = OP_LEAVETRY;
22c35a8c 5092 o->op_ppaddr = PL_ppaddr[OP_LEAVETRY];
11343788
MB		 5093 enter->op_other = o;
5094 return o;
79072805 5095 }
b5c19bd7 5096 else {
473986ff 5097 scalar((OP*)kid);
b5c19bd7
DM		 5098 PL_cv_has_eval = 1;
5099 }
79072805
LW		 5100 }
5101 else {
11343788 5102 op_free(o);
54b9620d 5103 o = newUNOP(OP_ENTEREVAL, 0, newDEFSVOP());
79072805 5104 }
3280af22 5105 o->op_targ = (PADOFFSET)PL_hints;
11343788 5106 return o;
79072805
LW		 5107}
5108
5109OP *
d98f61e7
GS		 5110Perl_ck_exit(pTHX_ OP *o)
5111{
5112#ifdef VMS
5113 HV *table = GvHV(PL_hintgv);
5114 if (table) {
5115 SV **svp = hv_fetch(table, "vmsish_exit", 11, FALSE);
5116 if (svp && *svp && SvTRUE(*svp))
5117 o->op_private |= OPpEXIT_VMSISH;
5118 }
96e176bf 5119 if (VMSISH_HUSHED) o->op_private |= OPpHUSH_VMSISH;
d98f61e7
GS		 5120#endif
5121 return ck_fun(o);
5122}
5123
5124OP *
cea2e8a9 5125Perl_ck_exec(pTHX_ OP *o)
79072805 5126{
11343788 5127 if (o->op_flags & OPf_STACKED) {
6867be6d 5128 OP *kid;
11343788
MB		 5129 o = ck_fun(o);
5130 kid = cUNOPo->op_first->op_sibling;
8990e307 5131 if (kid->op_type == OP_RV2GV)
93c66552 5132 op_null(kid);
79072805 5133 }
463ee0b2 5134 else
11343788
MB		 5135 o = listkids(o);
5136 return o;
79072805
LW		 5137}
5138
5139OP *
cea2e8a9 5140Perl_ck_exists(pTHX_ OP *o)
5f05dabc 5141{
5196be3e
MB		 5142 o = ck_fun(o);
5143 if (o->op_flags & OPf_KIDS) {
5144 OP *kid = cUNOPo->op_first;
afebc493
GS		 5145 if (kid->op_type == OP_ENTERSUB) {
5146 (void) ref(kid, o->op_type);
5147 if (kid->op_type != OP_RV2CV && !PL_error_count)
5148 Perl_croak(aTHX_ "%s argument is not a subroutine name",
53e06cf0 5149 OP_DESC(o));
afebc493
GS		 5150 o->op_private |= OPpEXISTS_SUB;
5151 }
5152 else if (kid->op_type == OP_AELEM)
01020589
GS		 5153 o->op_flags |= OPf_SPECIAL;
5154 else if (kid->op_type != OP_HELEM)
5155 Perl_croak(aTHX_ "%s argument is not a HASH or ARRAY element",
53e06cf0 5156 OP_DESC(o));
93c66552 5157 op_null(kid);
5f05dabc 5158 }
5196be3e 5159 return o;
5f05dabc 5160}
5161
79072805 5162OP *
cea2e8a9 5163Perl_ck_rvconst(pTHX_ register OP *o)
79072805 5164{
27da23d5 5165 dVAR;
11343788 5166 SVOP *kid = (SVOP*)cUNOPo->op_first;
85e6fe83 5167
3280af22 5168 o->op_private |= (PL_hints & HINT_STRICT_REFS);
79072805 5169 if (kid->op_type == OP_CONST) {
44a8e56a 5170 int iscv;
5171 GV *gv;
504618e9 5172 SV * const kidsv = kid->op_sv;
44a8e56a 5173
779c5bc9
GS		 5174 /* Is it a constant from cv_const_sv()? */
5175 if (SvROK(kidsv) && SvREADONLY(kidsv)) {
5176 SV *rsv = SvRV(kidsv);
504618e9 5177 const int svtype = SvTYPE(rsv);
e1ec3a88 5178 const char *badtype = Nullch;
779c5bc9
GS		 5179
5180 switch (o->op_type) {
5181 case OP_RV2SV:
5182 if (svtype > SVt_PVMG)
5183 badtype = "a SCALAR";
5184 break;
5185 case OP_RV2AV:
5186 if (svtype != SVt_PVAV)
5187 badtype = "an ARRAY";
5188 break;
5189 case OP_RV2HV:
6d822dc4 5190 if (svtype != SVt_PVHV)
779c5bc9 5191 badtype = "a HASH";
779c5bc9
GS		 5192 break;
5193 case OP_RV2CV:
5194 if (svtype != SVt_PVCV)
5195 badtype = "a CODE";
5196 break;
5197 }
5198 if (badtype)
cea2e8a9 5199 Perl_croak(aTHX_ "Constant is not %s reference", badtype);
779c5bc9
GS		 5200 return o;
5201 }
3280af22 5202 if ((PL_hints & HINT_STRICT_REFS) && (kid->op_private & OPpCONST_BARE)) {
e1ec3a88 5203 const char *badthing = Nullch;
5dc0d613 5204 switch (o->op_type) {
44a8e56a 5205 case OP_RV2SV:
5206 badthing = "a SCALAR";
5207 break;
5208 case OP_RV2AV:
5209 badthing = "an ARRAY";
5210 break;
5211 case OP_RV2HV:
5212 badthing = "a HASH";
5213 break;
5214 }
5215 if (badthing)
1c846c1f 5216 Perl_croak(aTHX_
7a5fd60d
NC		 5217 "Can't use bareword (\"%"SVf"\") as %s ref while \"strict refs\" in use",
5218 kidsv, badthing);
44a8e56a 5219 }
93233ece
CS		 5220 /*
5221 * This is a little tricky. We only want to add the symbol if we
5222 * didn't add it in the lexer. Otherwise we get duplicate strict
5223 * warnings. But if we didn't add it in the lexer, we must at
5224 * least pretend like we wanted to add it even if it existed before,
5225 * or we get possible typo warnings. OPpCONST_ENTERED says
5226 * whether the lexer already added THIS instance of this symbol.
5227 */
5196be3e 5228 iscv = (o->op_type == OP_RV2CV) * 2;
93233ece 5229 do {
7a5fd60d 5230 gv = gv_fetchsv(kidsv,
748a9306 5231 iscv | !(kid->op_private & OPpCONST_ENTERED),
a0d0e21e
LW		 5232 iscv
5233 ? SVt_PVCV
11343788 5234 : o->op_type == OP_RV2SV
a0d0e21e 5235 ? SVt_PV
11343788 5236 : o->op_type == OP_RV2AV
a0d0e21e 5237 ? SVt_PVAV
11343788 5238 : o->op_type == OP_RV2HV
a0d0e21e
LW		 5239 ? SVt_PVHV
5240 : SVt_PVGV);
93233ece
CS		 5241 } while (!gv && !(kid->op_private & OPpCONST_ENTERED) && !iscv++);
5242 if (gv) {
5243 kid->op_type = OP_GV;
5244 SvREFCNT_dec(kid->op_sv);
350de78d 5245#ifdef USE_ITHREADS
638eceb6 5246 /* XXX hack: dependence on sizeof(PADOP) <= sizeof(SVOP) */
350de78d 5247 kPADOP->op_padix = pad_alloc(OP_GV, SVs_PADTMP);
dd2155a4 5248 SvREFCNT_dec(PAD_SVl(kPADOP->op_padix));
743e66e6 5249 GvIN_PAD_on(gv);
dd2155a4 5250 PAD_SETSV(kPADOP->op_padix, (SV*) SvREFCNT_inc(gv));
350de78d 5251#else
93233ece 5252 kid->op_sv = SvREFCNT_inc(gv);
350de78d 5253#endif
23f1ca44 5254 kid->op_private = 0;
76cd736e 5255 kid->op_ppaddr = PL_ppaddr[OP_GV];
a0d0e21e 5256 }
79072805 5257 }
11343788 5258 return o;
79072805
LW		 5259}
5260
5261OP *
cea2e8a9 5262Perl_ck_ftst(pTHX_ OP *o)
79072805 5263{
27da23d5 5264 dVAR;
6867be6d 5265 const I32 type = o->op_type;
79072805 5266
d0dca557
JD		 5267 if (o->op_flags & OPf_REF) {
5268 /* nothing */
5269 }
5270 else if (o->op_flags & OPf_KIDS && cUNOPo->op_first->op_type != OP_STUB) {
11343788 5271 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805
LW		 5272
5273 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
a0d0e21e 5274 OP *newop = newGVOP(type, OPf_REF,
7a5fd60d 5275 gv_fetchsv(kid->op_sv, TRUE, SVt_PVIO));
11343788 5276 op_free(o);
d0dca557 5277 o = newop;
181bc48d 5278 return o;
79072805 5279 }
1af34c76
JH		 5280 else {
5281 if ((PL_hints & HINT_FILETEST_ACCESS) &&
5282 OP_IS_FILETEST_ACCESS(o))
5283 o->op_private |= OPpFT_ACCESS;
5284 }
fbb0b3b3
RGS		 5285 if (PL_check[kid->op_type] == MEMBER_TO_FPTR(Perl_ck_ftst)
5286 && kid->op_type != OP_STAT && kid->op_type != OP_LSTAT)
5287 o->op_private |= OPpFT_STACKED;
79072805
LW		 5288 }
5289 else {
11343788 5290 op_free(o);
79072805 5291 if (type == OP_FTTTY)
8fde6460 5292 o = newGVOP(type, OPf_REF, PL_stdingv);
79072805 5293 else
d0dca557 5294 o = newUNOP(type, 0, newDEFSVOP());
79072805 5295 }
11343788 5296 return o;
79072805
LW		 5297}
5298
5299OP *
cea2e8a9 5300Perl_ck_fun(pTHX_ OP *o)
79072805 5301{
6867be6d 5302 const int type = o->op_type;
22c35a8c 5303 register I32 oa = PL_opargs[type] >> OASHIFT;
aeea060c 5304
11343788 5305 if (o->op_flags & OPf_STACKED) {
79072805
LW		 5306 if ((oa & OA_OPTIONAL) && (oa >> 4) && !((oa >> 4) & OA_OPTIONAL))
5307 oa &= ~OA_OPTIONAL;
5308 else
11343788 5309 return no_fh_allowed(o);
79072805
LW		 5310 }
5311
11343788 5312 if (o->op_flags & OPf_KIDS) {
6867be6d
AL		 5313 OP **tokid = &cLISTOPo->op_first;
5314 register OP *kid = cLISTOPo->op_first;
5315 OP *sibl;
5316 I32 numargs = 0;
5317
8990e307 5318 if (kid->op_type == OP_PUSHMARK ||
155aba94 5319 (kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK))
8990e307 5320 {
79072805
LW		 5321 tokid = &kid->op_sibling;
5322 kid = kid->op_sibling;
5323 }
22c35a8c 5324 if (!kid && PL_opargs[type] & OA_DEFGV)
54b9620d 5325 *tokid = kid = newDEFSVOP();
79072805
LW		 5326
5327 while (oa && kid) {
5328 numargs++;
5329 sibl = kid->op_sibling;
5330 switch (oa & 7) {
5331 case OA_SCALAR:
62c18ce2
GS		 5332 /* list seen where single (scalar) arg expected? */
5333 if (numargs == 1 && !(oa >> 4)
5334 && kid->op_type == OP_LIST && type != OP_SCALAR)
5335 {
5336 return too_many_arguments(o,PL_op_desc[type]);
5337 }
79072805
LW		 5338 scalar(kid);
5339 break;
5340 case OA_LIST:
5341 if (oa < 16) {
5342 kid = 0;
5343 continue;
5344 }
5345 else
5346 list(kid);
5347 break;
5348 case OA_AVREF:
936edb8b 5349 if ((type == OP_PUSH || type == OP_UNSHIFT)
f87c3213 5350 && !kid->op_sibling && ckWARN(WARN_SYNTAX))
9014280d 5351 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
de4864e4 5352 "Useless use of %s with no values",
936edb8b 5353 PL_op_desc[type]);
b2ffa427 5354
79072805 5355 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5356 (kid->op_private & OPpCONST_BARE))
5357 {
79072805 5358 OP *newop = newAVREF(newGVOP(OP_GV, 0,
7a5fd60d 5359 gv_fetchsv(((SVOP*)kid)->op_sv, TRUE, SVt_PVAV) ));
12bcd1a6
PM		 5360 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
5361 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
7a5fd60d
NC		 5362 "Array @%"SVf" missing the @ in argument %"IVdf" of %s()",
5363 ((SVOP*)kid)->op_sv, (IV)numargs, PL_op_desc[type]);
79072805
LW		 5364 op_free(kid);
5365 kid = newop;
5366 kid->op_sibling = sibl;
5367 *tokid = kid;
5368 }
8990e307 5369 else if (kid->op_type != OP_RV2AV && kid->op_type != OP_PADAV)
35cd451c 5370 bad_type(numargs, "array", PL_op_desc[type], kid);
a0d0e21e 5371 mod(kid, type);
79072805
LW		 5372 break;
5373 case OA_HVREF:
5374 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5375 (kid->op_private & OPpCONST_BARE))
5376 {
79072805 5377 OP *newop = newHVREF(newGVOP(OP_GV, 0,
7a5fd60d 5378 gv_fetchsv(((SVOP*)kid)->op_sv, TRUE, SVt_PVHV) ));
12bcd1a6
PM		 5379 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
5380 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
7a5fd60d
NC		 5381 "Hash %%%"SVf" missing the %% in argument %"IVdf" of %s()",
5382 ((SVOP*)kid)->op_sv, (IV)numargs, PL_op_desc[type]);
79072805
LW		 5383 op_free(kid);
5384 kid = newop;
5385 kid->op_sibling = sibl;
5386 *tokid = kid;
5387 }
8990e307 5388 else if (kid->op_type != OP_RV2HV && kid->op_type != OP_PADHV)
35cd451c 5389 bad_type(numargs, "hash", PL_op_desc[type], kid);
a0d0e21e 5390 mod(kid, type);
79072805
LW		 5391 break;
5392 case OA_CVREF:
5393 {
a0d0e21e 5394 OP *newop = newUNOP(OP_NULL, 0, kid);
79072805
LW		 5395 kid->op_sibling = 0;
5396 linklist(kid);
5397 newop->op_next = newop;
5398 kid = newop;
5399 kid->op_sibling = sibl;
5400 *tokid = kid;
5401 }
5402 break;
5403 case OA_FILEREF:
c340be78 5404 if (kid->op_type != OP_GV && kid->op_type != OP_RV2GV) {
79072805 5405 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5406 (kid->op_private & OPpCONST_BARE))
5407 {
79072805 5408 OP *newop = newGVOP(OP_GV, 0,
7a5fd60d 5409 gv_fetchsv(((SVOP*)kid)->op_sv, TRUE, SVt_PVIO) );
afbdacea 5410 if (!(o->op_private & 1) && /* if not unop */
8a996ce8 5411 kid == cLISTOPo->op_last)
364daeac 5412 cLISTOPo->op_last = newop;
79072805
LW		 5413 op_free(kid);
5414 kid = newop;
5415 }
1ea32a52
GS		 5416 else if (kid->op_type == OP_READLINE) {
5417 /* neophyte patrol: open(<FH>), close(<FH>) etc. */
53e06cf0 5418 bad_type(numargs, "HANDLE", OP_DESC(o), kid);
1ea32a52 5419 }
79072805 5420 else {
35cd451c 5421 I32 flags = OPf_SPECIAL;
a6c40364 5422 I32 priv = 0;
2c8ac474
GS		 5423 PADOFFSET targ = 0;
5424
35cd451c 5425 /* is this op a FH constructor? */
853846ea 5426 if (is_handle_constructor(o,numargs)) {
e1ec3a88 5427 const char *name = Nullch;
dd2155a4 5428 STRLEN len = 0;
2c8ac474
GS		 5429
5430 flags = 0;
5431 /* Set a flag to tell rv2gv to vivify
853846ea
NIS		 5432 * need to "prove" flag does not mean something
5433 * else already - NI-S 1999/05/07
2c8ac474
GS		 5434 */
5435 priv = OPpDEREF;
5436 if (kid->op_type == OP_PADSV) {
dd2155a4
DM		 5437 name = PAD_COMPNAME_PV(kid->op_targ);
5438 /* SvCUR of a pad namesv can't be trusted
5439 * (see PL_generation), so calc its length
5440 * manually */
5441 if (name)
5442 len = strlen(name);
5443
2c8ac474
GS		 5444 }
5445 else if (kid->op_type == OP_RV2SV
5446 && kUNOP->op_first->op_type == OP_GV)
5447 {
5448 GV *gv = cGVOPx_gv(kUNOP->op_first);
5449 name = GvNAME(gv);
5450 len = GvNAMELEN(gv);
5451 }
afd1915d
GS		 5452 else if (kid->op_type == OP_AELEM
5453 || kid->op_type == OP_HELEM)
5454 {
0c4b0a3f
JH		 5455 OP *op;
5456
5457 name = 0;
5458 if ((op = ((BINOP*)kid)->op_first)) {
5459 SV *tmpstr = Nullsv;
e1ec3a88 5460 const char *a =
0c4b0a3f
JH		 5461 kid->op_type == OP_AELEM ?
5462 "[]" : "{}";
5463 if (((op->op_type == OP_RV2AV) ||
5464 (op->op_type == OP_RV2HV)) &&
5465 (op = ((UNOP*)op)->op_first) &&
5466 (op->op_type == OP_GV)) {
5467 /* packagevar $a[] or $h{} */
5468 GV *gv = cGVOPx_gv(op);
5469 if (gv)
5470 tmpstr =
5471 Perl_newSVpvf(aTHX_
5472 "%s%c...%c",
5473 GvNAME(gv),
5474 a[0], a[1]);
5475 }
5476 else if (op->op_type == OP_PADAV
5477 || op->op_type == OP_PADHV) {
5478 /* lexicalvar $a[] or $h{} */
6867be6d 5479 const char *padname =
0c4b0a3f
JH		 5480 PAD_COMPNAME_PV(op->op_targ);
5481 if (padname)
5482 tmpstr =
5483 Perl_newSVpvf(aTHX_
5484 "%s%c...%c",
5485 padname + 1,
5486 a[0], a[1]);
5487
5488 }
5489 if (tmpstr) {
93524f2b 5490 name = SvPV_const(tmpstr, len);
0c4b0a3f
JH		 5491 sv_2mortal(tmpstr);
5492 }
5493 }
5494 if (!name) {
5495 name = "__ANONIO__";
5496 len = 10;
5497 }
5498 mod(kid, type);
afd1915d 5499 }
2c8ac474
GS		 5500 if (name) {
5501 SV *namesv;
5502 targ = pad_alloc(OP_RV2GV, SVs_PADTMP);
dd2155a4 5503 namesv = PAD_SVl(targ);
862a34c6 5504 SvUPGRADE(namesv, SVt_PV);
2c8ac474
GS		 5505 if (*name != '$')
5506 sv_setpvn(namesv, "$", 1);
5507 sv_catpvn(namesv, name, len);
5508 }
853846ea 5509 }
79072805 5510 kid->op_sibling = 0;
35cd451c 5511 kid = newUNOP(OP_RV2GV, flags, scalar(kid));
2c8ac474
GS		 5512 kid->op_targ = targ;
5513 kid->op_private |= priv;
79072805
LW		 5514 }
5515 kid->op_sibling = sibl;
5516 *tokid = kid;
5517 }
5518 scalar(kid);
5519 break;
5520 case OA_SCALARREF:
a0d0e21e 5521 mod(scalar(kid), type);
79072805
LW		 5522 break;
5523 }
5524 oa >>= 4;
5525 tokid = &kid->op_sibling;
5526 kid = kid->op_sibling;
5527 }
11343788 5528 o->op_private |= numargs;
79072805 5529 if (kid)
53e06cf0 5530 return too_many_arguments(o,OP_DESC(o));
11343788 5531 listkids(o);
79072805 5532 }
22c35a8c 5533 else if (PL_opargs[type] & OA_DEFGV) {
11343788 5534 op_free(o);
54b9620d 5535 return newUNOP(type, 0, newDEFSVOP());
a0d0e21e
LW		 5536 }
5537
79072805
LW		 5538 if (oa) {
5539 while (oa & OA_OPTIONAL)
5540 oa >>= 4;
5541 if (oa && oa != OA_LIST)
53e06cf0 5542 return too_few_arguments(o,OP_DESC(o));
79072805 5543 }
11343788 5544 return o;
79072805
LW		 5545}
5546
5547OP *
cea2e8a9 5548Perl_ck_glob(pTHX_ OP *o)
79072805 5549{
27da23d5 5550 dVAR;
fb73857a 5551 GV *gv;
5552
649da076 5553 o = ck_fun(o);
1f2bfc8a 5554 if ((o->op_flags & OPf_KIDS) && !cLISTOPo->op_first->op_sibling)
54b9620d 5555 append_elem(OP_GLOB, o, newDEFSVOP());
fb73857a 5556
b9f751c0
GS		 5557 if (!((gv = gv_fetchpv("glob", FALSE, SVt_PVCV))
5558 && GvCVu(gv) && GvIMPORTED_CV(gv)))
5559 {
fb73857a 5560 gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
b9f751c0 5561 }
b1cb66bf 5562
52bb0670 5563#if !defined(PERL_EXTERNAL_GLOB)
72b16652 5564 /* XXX this can be tightened up and made more failsafe. */
f444d496 5565 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv))) {
7d3fb230 5566 GV *glob_gv;
72b16652 5567 ENTER;
00ca71c1
NIS		 5568 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
5569 newSVpvn("File::Glob", 10), Nullsv, Nullsv, Nullsv);
72b16652 5570 gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
7d3fb230
BS		 5571 glob_gv = gv_fetchpv("File::Glob::csh_glob", FALSE, SVt_PVCV);
5572 GvCV(gv) = GvCV(glob_gv);
7fc63493 5573 (void)SvREFCNT_inc((SV*)GvCV(gv));
7d3fb230 5574 GvIMPORTED_CV_on(gv);
72b16652
GS		 5575 LEAVE;
5576 }
52bb0670 5577#endif /* PERL_EXTERNAL_GLOB */
72b16652 5578
b9f751c0 5579 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
5196be3e 5580 append_elem(OP_GLOB, o,
80252599 5581 newSVOP(OP_CONST, 0, newSViv(PL_glob_index++)));
1f2bfc8a 5582 o->op_type = OP_LIST;
22c35a8c 5583 o->op_ppaddr = PL_ppaddr[OP_LIST];
1f2bfc8a 5584 cLISTOPo->op_first->op_type = OP_PUSHMARK;
22c35a8c 5585 cLISTOPo->op_first->op_ppaddr = PL_ppaddr[OP_PUSHMARK];
ad33f57d 5586 cLISTOPo->op_first->op_targ = 0;
1f2bfc8a 5587 o = newUNOP(OP_ENTERSUB, OPf_STACKED,
aeea060c 5588 append_elem(OP_LIST, o,
1f2bfc8a
MB		 5589 scalar(newUNOP(OP_RV2CV, 0,
5590 newGVOP(OP_GV, 0, gv)))));
d58bf5aa
MB		 5591 o = newUNOP(OP_NULL, 0, ck_subr(o));
5592 o->op_targ = OP_GLOB; /* hint at what it used to be */
5593 return o;
b1cb66bf 5594 }
5595 gv = newGVgen("main");
a0d0e21e 5596 gv_IOadd(gv);
11343788
MB		 5597 append_elem(OP_GLOB, o, newGVOP(OP_GV, 0, gv));
5598 scalarkids(o);
649da076 5599 return o;
79072805
LW		 5600}
5601
5602OP *
cea2e8a9 5603Perl_ck_grep(pTHX_ OP *o)
79072805 5604{
27da23d5 5605 dVAR;
79072805
LW		 5606 LOGOP *gwop;
5607 OP *kid;
6867be6d 5608 const OPCODE type = o->op_type == OP_GREPSTART ? OP_GREPWHILE : OP_MAPWHILE;
59f00321 5609 I32 offset;
79072805 5610
22c35a8c 5611 o->op_ppaddr = PL_ppaddr[OP_GREPSTART];
b7dc083c 5612 NewOp(1101, gwop, 1, LOGOP);
aeea060c 5613
11343788 5614 if (o->op_flags & OPf_STACKED) {
a0d0e21e 5615 OP* k;
11343788
MB		 5616 o = ck_sort(o);
5617 kid = cLISTOPo->op_first->op_sibling;
d09ad856
BS		 5618 if (!cUNOPx(kid)->op_next)
5619 Perl_croak(aTHX_ "panic: ck_grep");
e3c9a8b9 5620 for (k = cUNOPx(kid)->op_first; k; k = k->op_next) {
a0d0e21e
LW		 5621 kid = k;
5622 }
5623 kid->op_next = (OP*)gwop;
11343788 5624 o->op_flags &= ~OPf_STACKED;
93a17b20 5625 }
11343788 5626 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e
LW		 5627 if (type == OP_MAPWHILE)
5628 list(kid);
5629 else
5630 scalar(kid);
11343788 5631 o = ck_fun(o);
3280af22 5632 if (PL_error_count)
11343788 5633 return o;
aeea060c 5634 kid = cLISTOPo->op_first->op_sibling;
79072805 5635 if (kid->op_type != OP_NULL)
cea2e8a9 5636 Perl_croak(aTHX_ "panic: ck_grep");
79072805
LW		 5637 kid = kUNOP->op_first;
5638
a0d0e21e 5639 gwop->op_type = type;
22c35a8c 5640 gwop->op_ppaddr = PL_ppaddr[type];
11343788 5641 gwop->op_first = listkids(o);
79072805 5642 gwop->op_flags |= OPf_KIDS;
79072805 5643 gwop->op_other = LINKLIST(kid);
79072805 5644 kid->op_next = (OP*)gwop;
59f00321
RGS		 5645 offset = pad_findmy("$_");
5646 if (offset == NOT_IN_PAD || PAD_COMPNAME_FLAGS(offset) & SVpad_OUR) {
5647 o->op_private = gwop->op_private = 0;
5648 gwop->op_targ = pad_alloc(type, SVs_PADTMP);
5649 }
5650 else {
5651 o->op_private = gwop->op_private = OPpGREP_LEX;
5652 gwop->op_targ = o->op_targ = offset;
5653 }
79072805 5654
11343788 5655 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e 5656 if (!kid || !kid->op_sibling)
53e06cf0 5657 return too_few_arguments(o,OP_DESC(o));
a0d0e21e
LW		 5658 for (kid = kid->op_sibling; kid; kid = kid->op_sibling)
5659 mod(kid, OP_GREPSTART);
5660
79072805
LW		 5661 return (OP*)gwop;
5662}
5663
5664OP *
cea2e8a9 5665Perl_ck_index(pTHX_ OP *o)
79072805 5666{
11343788
MB		 5667 if (o->op_flags & OPf_KIDS) {
5668 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
0b71040e
LW		 5669 if (kid)
5670 kid = kid->op_sibling; /* get past "big" */
79072805 5671 if (kid && kid->op_type == OP_CONST)
2779dcf1 5672 fbm_compile(((SVOP*)kid)->op_sv, 0);
79072805 5673 }
11343788 5674 return ck_fun(o);
79072805
LW		 5675}
5676
5677OP *
cea2e8a9 5678Perl_ck_lengthconst(pTHX_ OP *o)
79072805
LW		 5679{
5680 /* XXX length optimization goes here */
11343788 5681 return ck_fun(o);
79072805
LW		 5682}
5683
5684OP *
cea2e8a9 5685Perl_ck_lfun(pTHX_ OP *o)
79072805 5686{
6867be6d 5687 const OPCODE type = o->op_type;
5dc0d613 5688 return modkids(ck_fun(o), type);
79072805
LW		 5689}
5690
5691OP *
cea2e8a9 5692Perl_ck_defined(pTHX_ OP *o) /* 19990527 MJD */
69794302 5693{
12bcd1a6 5694 if ((o->op_flags & OPf_KIDS) && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)) {
d0334bed
GS		 5695 switch (cUNOPo->op_first->op_type) {
5696 case OP_RV2AV:
a8739d98
JH		 5697 /* This is needed for
5698 if (defined %stash::)
5699 to work. Do not break Tk.
5700 */
1c846c1f 5701 break; /* Globals via GV can be undef */
d0334bed
GS		 5702 case OP_PADAV:
5703 case OP_AASSIGN: /* Is this a good idea? */
12bcd1a6 5704 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
f10b0346 5705 "defined(@array) is deprecated");
12bcd1a6 5706 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
cc507455 5707 "\t(Maybe you should just omit the defined()?)\n");
69794302 5708 break;
d0334bed 5709 case OP_RV2HV:
a8739d98
JH		 5710 /* This is needed for
5711 if (defined %stash::)
5712 to work. Do not break Tk.
5713 */
1c846c1f 5714 break; /* Globals via GV can be undef */
d0334bed 5715 case OP_PADHV:
12bcd1a6 5716 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
894356b3 5717 "defined(%%hash) is deprecated");
12bcd1a6 5718 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
cc507455 5719 "\t(Maybe you should just omit the defined()?)\n");
d0334bed
GS		 5720 break;
5721 default:
5722 /* no warning */
5723 break;
5724 }
69794302
MJD		 5725 }
5726 return ck_rfun(o);
5727}
5728
5729OP *
cea2e8a9 5730Perl_ck_rfun(pTHX_ OP *o)
8990e307 5731{
6867be6d 5732 const OPCODE type = o->op_type;
5dc0d613 5733 return refkids(ck_fun(o), type);
8990e307
LW		 5734}
5735
5736OP *
cea2e8a9 5737Perl_ck_listiob(pTHX_ OP *o)
79072805
LW		 5738{
5739 register OP *kid;
aeea060c 5740
11343788 5741 kid = cLISTOPo->op_first;
79072805 5742 if (!kid) {
11343788
MB		 5743 o = force_list(o);
5744 kid = cLISTOPo->op_first;
79072805
LW		 5745 }
5746 if (kid->op_type == OP_PUSHMARK)
5747 kid = kid->op_sibling;
11343788 5748 if (kid && o->op_flags & OPf_STACKED)
79072805
LW		 5749 kid = kid->op_sibling;
5750 else if (kid && !kid->op_sibling) { /* print HANDLE; */
5751 if (kid->op_type == OP_CONST && kid->op_private & OPpCONST_BARE) {
11343788 5752 o->op_flags |= OPf_STACKED; /* make it a filehandle */
748a9306 5753 kid = newUNOP(OP_RV2GV, OPf_REF, scalar(kid));
11343788
MB		 5754 cLISTOPo->op_first->op_sibling = kid;
5755 cLISTOPo->op_last = kid;
79072805
LW		 5756 kid = kid->op_sibling;
5757 }
5758 }
b2ffa427 5759
79072805 5760 if (!kid)
54b9620d 5761 append_elem(o->op_type, o, newDEFSVOP());
79072805 5762
2de3dbcc 5763 return listkids(o);
bbce6d69 5764}
5765
5766OP *
b162f9ea
IZ		 5767Perl_ck_sassign(pTHX_ OP *o)
5768{
5769 OP *kid = cLISTOPo->op_first;
5770 /* has a disposable target? */
5771 if ((PL_opargs[kid->op_type] & OA_TARGLEX)
6b66af17
GS		 5772 && !(kid->op_flags & OPf_STACKED)
5773 /* Cannot steal the second time! */
5774 && !(kid->op_private & OPpTARGET_MY))
b162f9ea
IZ		 5775 {
5776 OP *kkid = kid->op_sibling;
5777
5778 /* Can just relocate the target. */
2c2d71f5
JH		 5779 if (kkid && kkid->op_type == OP_PADSV
5780 && !(kkid->op_private & OPpLVAL_INTRO))
5781 {
b162f9ea 5782 kid->op_targ = kkid->op_targ;
743e66e6 5783 kkid->op_targ = 0;
b162f9ea
IZ		 5784 /* Now we do not need PADSV and SASSIGN. */
5785 kid->op_sibling = o->op_sibling; /* NULL */
5786 cLISTOPo->op_first = NULL;
5787 op_free(o);
5788 op_free(kkid);
5789 kid->op_private |= OPpTARGET_MY; /* Used for context settings */
5790 return kid;
5791 }
5792 }
b9d46b39
RGS		 5793 /* optimise C<my $x = undef> to C<my $x> */
5794 if (kid->op_type == OP_UNDEF) {
5795 OP *kkid = kid->op_sibling;
5796 if (kkid && kkid->op_type == OP_PADSV
5797 && (kkid->op_private & OPpLVAL_INTRO))
5798 {
5799 cLISTOPo->op_first = NULL;
5800 kid->op_sibling = NULL;
5801 op_free(o);
5802 op_free(kid);
5803 return kkid;
5804 }
5805 }
b162f9ea
IZ		 5806 return o;
5807}
5808
5809OP *
cea2e8a9 5810Perl_ck_match(pTHX_ OP *o)
79072805 5811{
59f00321 5812 if (o->op_type != OP_QR) {
6867be6d 5813 const I32 offset = pad_findmy("$_");
59f00321
RGS		 5814 if (offset != NOT_IN_PAD && !(PAD_COMPNAME_FLAGS(offset) & SVpad_OUR)) {
5815 o->op_targ = offset;
5816 o->op_private |= OPpTARGET_MY;
5817 }
5818 }
5819 if (o->op_type == OP_MATCH || o->op_type == OP_QR)
5820 o->op_private |= OPpRUNTIME;
11343788 5821 return o;
79072805
LW		 5822}
5823
5824OP *
f5d5a27c
CS		 5825Perl_ck_method(pTHX_ OP *o)
5826{
5827 OP *kid = cUNOPo->op_first;
5828 if (kid->op_type == OP_CONST) {
5829 SV* sv = kSVOP->op_sv;
b15aece3 5830 if (!(strchr(SvPVX_const(sv), ':') || strchr(SvPVX_const(sv), '\''))) {
f5d5a27c 5831 OP *cmop;
1c846c1f 5832 if (!SvREADONLY(sv) || !SvFAKE(sv)) {
b15aece3 5833 sv = newSVpvn_share(SvPVX_const(sv), SvCUR(sv), 0);
1c846c1f
NIS		 5834 }
5835 else {
5836 kSVOP->op_sv = Nullsv;
5837 }
f5d5a27c 5838 cmop = newSVOP(OP_METHOD_NAMED, 0, sv);
f5d5a27c
CS		 5839 op_free(o);
5840 return cmop;
5841 }
5842 }
5843 return o;
5844}
5845
5846OP *
cea2e8a9 5847Perl_ck_null(pTHX_ OP *o)
79072805 5848{
11343788 5849 return o;
79072805
LW		 5850}
5851
5852OP *
16fe6d59
GS		 5853Perl_ck_open(pTHX_ OP *o)
5854{
5855 HV *table = GvHV(PL_hintgv);
5856 if (table) {
5857 SV **svp;
5858 I32 mode;
5859 svp = hv_fetch(table, "open_IN", 7, FALSE);
5860 if (svp && *svp) {
5861 mode = mode_from_discipline(*svp);
5862 if (mode & O_BINARY)
5863 o->op_private |= OPpOPEN_IN_RAW;
5864 else if (mode & O_TEXT)
5865 o->op_private |= OPpOPEN_IN_CRLF;
5866 }
5867
5868 svp = hv_fetch(table, "open_OUT", 8, FALSE);
5869 if (svp && *svp) {
5870 mode = mode_from_discipline(*svp);
5871 if (mode & O_BINARY)
5872 o->op_private |= OPpOPEN_OUT_RAW;
5873 else if (mode & O_TEXT)
5874 o->op_private |= OPpOPEN_OUT_CRLF;
5875 }
5876 }
5877 if (o->op_type == OP_BACKTICK)
5878 return o;
3b82e551
JH		 5879 {
5880 /* In case of three-arg dup open remove strictness
5881 * from the last arg if it is a bareword. */
5882 OP *first = cLISTOPx(o)->op_first; /* The pushmark. */
5883 OP *last = cLISTOPx(o)->op_last; /* The bareword. */
5884 OP *oa;
b15aece3 5885 const char *mode;
3b82e551
JH		 5886
5887 if ((last->op_type == OP_CONST) && /* The bareword. */
5888 (last->op_private & OPpCONST_BARE) &&
5889 (last->op_private & OPpCONST_STRICT) &&
5890 (oa = first->op_sibling) && /* The fh. */
5891 (oa = oa->op_sibling) && /* The mode. */
5892 SvPOK(((SVOP*)oa)->op_sv) &&
b15aece3 5893 (mode = SvPVX_const(((SVOP*)oa)->op_sv)) &&
3b82e551
JH		 5894 mode[0] == '>' && mode[1] == '&' && /* A dup open. */
5895 (last == oa->op_sibling)) /* The bareword. */
5896 last->op_private &= ~OPpCONST_STRICT;
5897 }
16fe6d59
GS		 5898 return ck_fun(o);
5899}
5900
5901OP *
cea2e8a9 5902Perl_ck_repeat(pTHX_ OP *o)
79072805 5903{
11343788
MB		 5904 if (cBINOPo->op_first->op_flags & OPf_PARENS) {
5905 o->op_private |= OPpREPEAT_DOLIST;
5906 cBINOPo->op_first = force_list(cBINOPo->op_first);
79072805
LW		 5907 }
5908 else
11343788
MB		 5909 scalar(o);
5910 return o;
79072805
LW		 5911}
5912
5913OP *
cea2e8a9 5914Perl_ck_require(pTHX_ OP *o)
8990e307 5915{
ec4ab249
GA		 5916 GV* gv;
5917
11343788
MB		 5918 if (o->op_flags & OPf_KIDS) { /* Shall we supply missing .pm? */
5919 SVOP *kid = (SVOP*)cUNOPo->op_first;
8990e307
LW		 5920
5921 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
5c144d81
NC		 5922 SV *sv = kid->op_sv;
5923 U32 was_readonly = SvREADONLY(sv);
8990e307 5924 char *s;
5c144d81
NC		 5925
5926 if (was_readonly) {
5927 if (SvFAKE(sv)) {
5928 sv_force_normal_flags(sv, 0);
5929 assert(!SvREADONLY(sv));
5930 was_readonly = 0;
5931 } else {
5932 SvREADONLY_off(sv);
5933 }
5934 }
5935
5936 for (s = SvPVX(sv); *s; s++) {
a0d0e21e
LW		 5937 if (*s == ':' && s[1] == ':') {
5938 *s = '/';
1aef975c 5939 Move(s+2, s+1, strlen(s+2)+1, char);
5c144d81 5940 SvCUR_set(sv, SvCUR(sv) - 1);
a0d0e21e 5941 }
8990e307 5942 }
5c144d81
NC		 5943 sv_catpvn(sv, ".pm", 3);
5944 SvFLAGS(sv) |= was_readonly;
8990e307
LW		 5945 }
5946 }
ec4ab249
GA		 5947
5948 /* handle override, if any */
5949 gv = gv_fetchpv("require", FALSE, SVt_PVCV);
b9f751c0 5950 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv)))
ec4ab249
GA		 5951 gv = gv_fetchpv("CORE::GLOBAL::require", FALSE, SVt_PVCV);
5952
b9f751c0 5953 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
ec4ab249
GA		 5954 OP *kid = cUNOPo->op_first;
5955 cUNOPo->op_first = 0;
5956 op_free(o);
5957 return ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
5958 append_elem(OP_LIST, kid,
5959 scalar(newUNOP(OP_RV2CV, 0,
5960 newGVOP(OP_GV, 0,
5961 gv))))));
5962 }
5963
11343788 5964 return ck_fun(o);
8990e307
LW		 5965}
5966
78f9721b
SM		 5967OP *
5968Perl_ck_return(pTHX_ OP *o)
5969{
78f9721b 5970 if (CvLVALUE(PL_compcv)) {
6867be6d 5971 OP *kid;
78f9721b
SM		 5972 for (kid = cLISTOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
5973 mod(kid, OP_LEAVESUBLV);
5974 }
5975 return o;
5976}
5977
22c35a8c 5978#if 0
8990e307 5979OP *
cea2e8a9 5980Perl_ck_retarget(pTHX_ OP *o)
79072805 5981{
cea2e8a9 5982 Perl_croak(aTHX_ "NOT IMPL LINE %d",__LINE__);
79072805 5983 /* STUB */
11343788 5984 return o;
79072805 5985}
22c35a8c 5986#endif
79072805
LW		 5987
5988OP *
cea2e8a9 5989Perl_ck_select(pTHX_ OP *o)
79072805 5990{
27da23d5 5991 dVAR;
c07a80fd 5992 OP* kid;
11343788
MB		 5993 if (o->op_flags & OPf_KIDS) {
5994 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
2304df62 5995 if (kid && kid->op_sibling) {
11343788 5996 o->op_type = OP_SSELECT;
22c35a8c 5997 o->op_ppaddr = PL_ppaddr[OP_SSELECT];
11343788
MB		 5998 o = ck_fun(o);
5999 return fold_constants(o);
79072805
LW		 6000 }
6001 }
11343788
MB		 6002 o = ck_fun(o);
6003 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
c07a80fd 6004 if (kid && kid->op_type == OP_RV2GV)
6005 kid->op_private &= ~HINT_STRICT_REFS;
11343788 6006 return o;
79072805
LW		 6007}
6008
6009OP *
cea2e8a9 6010Perl_ck_shift(pTHX_ OP *o)
79072805 6011{
6867be6d 6012 const I32 type = o->op_type;
79072805 6013
11343788 6014 if (!(o->op_flags & OPf_KIDS)) {
6d4ff0d2 6015 OP *argop;
b2ffa427 6016
11343788 6017 op_free(o);
6d4ff0d2 6018 argop = newUNOP(OP_RV2AV, 0,
8fde6460 6019 scalar(newGVOP(OP_GV, 0, CvUNIQUE(PL_compcv) ? PL_argvgv : PL_defgv)));
6d4ff0d2 6020 return newUNOP(type, 0, scalar(argop));
79072805 6021 }
11343788 6022 return scalar(modkids(ck_fun(o), type));
79072805
LW		 6023}
6024
6025OP *
cea2e8a9 6026Perl_ck_sort(pTHX_ OP *o)
79072805 6027{
8e3f9bdf 6028 OP *firstkid;
bbce6d69 6029
9ea6e965 6030 if (o->op_type == OP_SORT && o->op_flags & OPf_STACKED)
51a19bc0 6031 simplify_sort(o);
8e3f9bdf
GS		 6032 firstkid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
6033 if (o->op_flags & OPf_STACKED) { /* may have been cleared */
9c5ffd7c 6034 OP *k = NULL;
8e3f9bdf 6035 OP *kid = cUNOPx(firstkid)->op_first; /* get past null */
79072805 6036
463ee0b2 6037 if (kid->op_type == OP_SCOPE || kid->op_type == OP_LEAVE) {
79072805 6038 linklist(kid);
463ee0b2
LW		 6039 if (kid->op_type == OP_SCOPE) {
6040 k = kid->op_next;
6041 kid->op_next = 0;
79072805 6042 }
463ee0b2 6043 else if (kid->op_type == OP_LEAVE) {
11343788 6044 if (o->op_type == OP_SORT) {
93c66552 6045 op_null(kid); /* wipe out leave */
748a9306 6046 kid->op_next = kid;
463ee0b2 6047
748a9306
LW		 6048 for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
6049 if (k->op_next == kid)
6050 k->op_next = 0;
71a29c3c
GS		 6051 /* don't descend into loops */
6052 else if (k->op_type == OP_ENTERLOOP
6053 || k->op_type == OP_ENTERITER)
6054 {
6055 k = cLOOPx(k)->op_lastop;
6056 }
748a9306 6057 }
463ee0b2 6058 }
748a9306
LW		 6059 else
6060 kid->op_next = 0; /* just disconnect the leave */
a0d0e21e 6061 k = kLISTOP->op_first;
463ee0b2 6062 }
a2efc822 6063 CALL_PEEP(k);
a0d0e21e 6064
8e3f9bdf
GS		 6065 kid = firstkid;
6066 if (o->op_type == OP_SORT) {
6067 /* provide scalar context for comparison function/block */
6068 kid = scalar(kid);
a0d0e21e 6069 kid->op_next = kid;
8e3f9bdf 6070 }
a0d0e21e
LW		 6071 else
6072 kid->op_next = k;
11343788 6073 o->op_flags |= OPf_SPECIAL;
79072805 6074 }
c6e96bcb 6075 else if (kid->op_type == OP_RV2SV || kid->op_type == OP_PADSV)
93c66552 6076 op_null(firstkid);
8e3f9bdf
GS		 6077
6078 firstkid = firstkid->op_sibling;
79072805 6079 }
bbce6d69 6080
8e3f9bdf
GS		 6081 /* provide list context for arguments */
6082 if (o->op_type == OP_SORT)
6083 list(firstkid);
6084
11343788 6085 return o;
79072805 6086}
bda4119b
GS		 6087
6088STATIC void
cea2e8a9 6089S_simplify_sort(pTHX_ OP *o)
9c007264
JH		 6090{
6091 register OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
6092 OP *k;
eb209983 6093 int descending;
350de78d 6094 GV *gv;
770526c1 6095 const char *gvname;
9c007264
JH		 6096 if (!(o->op_flags & OPf_STACKED))
6097 return;
1c846c1f
NIS		 6098 GvMULTI_on(gv_fetchpv("a", TRUE, SVt_PV));
6099 GvMULTI_on(gv_fetchpv("b", TRUE, SVt_PV));
82092f1d 6100 kid = kUNOP->op_first; /* get past null */
9c007264
JH		 6101 if (kid->op_type != OP_SCOPE)
6102 return;
6103 kid = kLISTOP->op_last; /* get past scope */
6104 switch(kid->op_type) {
6105 case OP_NCMP:
6106 case OP_I_NCMP:
6107 case OP_SCMP:
6108 break;
6109 default:
6110 return;
6111 }
6112 k = kid; /* remember this node*/
6113 if (kBINOP->op_first->op_type != OP_RV2SV)
6114 return;
6115 kid = kBINOP->op_first; /* get past cmp */
6116 if (kUNOP->op_first->op_type != OP_GV)
6117 return;
6118 kid = kUNOP->op_first; /* get past rv2sv */
638eceb6 6119 gv = kGVOP_gv;
350de78d 6120 if (GvSTASH(gv) != PL_curstash)
9c007264 6121 return;
770526c1
NC		 6122 gvname = GvNAME(gv);
6123 if (*gvname == 'a' && gvname[1] == '\0')
eb209983 6124 descending = 0;
770526c1 6125 else if (*gvname == 'b' && gvname[1] == '\0')
eb209983 6126 descending = 1;
9c007264
JH		 6127 else
6128 return;
eb209983 6129
9c007264
JH		 6130 kid = k; /* back to cmp */
6131 if (kBINOP->op_last->op_type != OP_RV2SV)
6132 return;
6133 kid = kBINOP->op_last; /* down to 2nd arg */
6134 if (kUNOP->op_first->op_type != OP_GV)
6135 return;
6136 kid = kUNOP->op_first; /* get past rv2sv */
638eceb6 6137 gv = kGVOP_gv;
770526c1
NC		 6138 if (GvSTASH(gv) != PL_curstash)
6139 return;
6140 gvname = GvNAME(gv);
6141 if ( descending
6142 ? !(*gvname == 'a' && gvname[1] == '\0')
6143 : !(*gvname == 'b' && gvname[1] == '\0'))
9c007264
JH		 6144 return;
6145 o->op_flags &= ~(OPf_STACKED | OPf_SPECIAL);
eb209983
NC		 6146 if (descending)
6147 o->op_private |= OPpSORT_DESCEND;
9c007264
JH		 6148 if (k->op_type == OP_NCMP)
6149 o->op_private |= OPpSORT_NUMERIC;
6150 if (k->op_type == OP_I_NCMP)
6151 o->op_private |= OPpSORT_NUMERIC | OPpSORT_INTEGER;
e507f050
SM		 6152 kid = cLISTOPo->op_first->op_sibling;
6153 cLISTOPo->op_first->op_sibling = kid->op_sibling; /* bypass old block */
6154 op_free(kid); /* then delete it */
9c007264 6155}
79072805
LW		 6156
6157OP *
cea2e8a9 6158Perl_ck_split(pTHX_ OP *o)
79072805 6159{
27da23d5 6160 dVAR;
79072805 6161 register OP *kid;
aeea060c 6162
11343788
MB		 6163 if (o->op_flags & OPf_STACKED)
6164 return no_fh_allowed(o);
79072805 6165
11343788 6166 kid = cLISTOPo->op_first;
8990e307 6167 if (kid->op_type != OP_NULL)
cea2e8a9 6168 Perl_croak(aTHX_ "panic: ck_split");
8990e307 6169 kid = kid->op_sibling;
11343788
MB		 6170 op_free(cLISTOPo->op_first);
6171 cLISTOPo->op_first = kid;
85e6fe83 6172 if (!kid) {
79cb57f6 6173 cLISTOPo->op_first = kid = newSVOP(OP_CONST, 0, newSVpvn(" ", 1));
11343788 6174 cLISTOPo->op_last = kid; /* There was only one element previously */
85e6fe83 6175 }
79072805 6176
de4bf5b3 6177 if (kid->op_type != OP_MATCH || kid->op_flags & OPf_STACKED) {
79072805 6178 OP *sibl = kid->op_sibling;
463ee0b2 6179 kid->op_sibling = 0;
131b3ad0 6180 kid = pmruntime( newPMOP(OP_MATCH, OPf_SPECIAL), kid, 0);
11343788
MB		 6181 if (cLISTOPo->op_first == cLISTOPo->op_last)
6182 cLISTOPo->op_last = kid;
6183 cLISTOPo->op_first = kid;
79072805
LW		 6184 kid->op_sibling = sibl;
6185 }
6186
6187 kid->op_type = OP_PUSHRE;
22c35a8c 6188 kid->op_ppaddr = PL_ppaddr[OP_PUSHRE];
79072805 6189 scalar(kid);
f34840d8
MJD		 6190 if (ckWARN(WARN_REGEXP) && ((PMOP *)kid)->op_pmflags & PMf_GLOBAL) {
6191 Perl_warner(aTHX_ packWARN(WARN_REGEXP),
6192 "Use of /g modifier is meaningless in split");
6193 }
79072805
LW		 6194
6195 if (!kid->op_sibling)
54b9620d 6196 append_elem(OP_SPLIT, o, newDEFSVOP());
79072805
LW		 6197
6198 kid = kid->op_sibling;
6199 scalar(kid);
6200
6201 if (!kid->op_sibling)
11343788 6202 append_elem(OP_SPLIT, o, newSVOP(OP_CONST, 0, newSViv(0)));
79072805
LW		 6203
6204 kid = kid->op_sibling;
6205 scalar(kid);
6206
6207 if (kid->op_sibling)
53e06cf0 6208 return too_many_arguments(o,OP_DESC(o));
79072805 6209
11343788 6210 return o;
79072805
LW		 6211}
6212
6213OP *
1c846c1f 6214Perl_ck_join(pTHX_ OP *o)
eb6e2d6f
GS		 6215{
6216 if (ckWARN(WARN_SYNTAX)) {
6867be6d 6217 const OP *kid = cLISTOPo->op_first->op_sibling;
eb6e2d6f 6218 if (kid && kid->op_type == OP_MATCH) {
6867be6d
AL		 6219 const REGEXP *re = PM_GETRE(kPMOP);
6220 const char *pmstr = re ? re->precomp : "STRING";
9014280d 6221 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
eb6e2d6f
GS		 6222 "/%s/ should probably be written as \"%s\"",
6223 pmstr, pmstr);
6224 }
6225 }
6226 return ck_fun(o);
6227}
6228
6229OP *
cea2e8a9 6230Perl_ck_subr(pTHX_ OP *o)
79072805 6231{
11343788
MB		 6232 OP *prev = ((cUNOPo->op_first->op_sibling)
6233 ? cUNOPo : ((UNOP*)cUNOPo->op_first))->op_first;
6234 OP *o2 = prev->op_sibling;
4633a7c4
LW		 6235 OP *cvop;
6236 char *proto = 0;
6237 CV *cv = 0;
46fc3d4c 6238 GV *namegv = 0;
4633a7c4
LW		 6239 int optional = 0;
6240 I32 arg = 0;
5b794e05 6241 I32 contextclass = 0;
90b7f708 6242 char *e = 0;
0723351e 6243 bool delete_op = 0;
4633a7c4 6244
d3011074 6245 o->op_private |= OPpENTERSUB_HASTARG;
11343788 6246 for (cvop = o2; cvop->op_sibling; cvop = cvop->op_sibling) ;
4633a7c4
LW		 6247 if (cvop->op_type == OP_RV2CV) {
6248 SVOP* tmpop;
11343788 6249 o->op_private |= (cvop->op_private & OPpENTERSUB_AMPER);
93c66552 6250 op_null(cvop); /* disable rv2cv */
4633a7c4 6251 tmpop = (SVOP*)((UNOP*)cvop)->op_first;
76cd736e 6252 if (tmpop->op_type == OP_GV && !(o->op_private & OPpENTERSUB_AMPER)) {
638eceb6 6253 GV *gv = cGVOPx_gv(tmpop);
350de78d 6254 cv = GvCVu(gv);
76cd736e
GS		 6255 if (!cv)
6256 tmpop->op_private |= OPpEARLY_CV;
06492da6
SF		 6257 else {
6258 if (SvPOK(cv)) {
6259 namegv = CvANON(cv) ? gv : CvGV(cv);
8b6b16e7 6260 proto = SvPV_nolen((SV*)cv);
06492da6
SF		 6261 }
6262 if (CvASSERTION(cv)) {
6263 if (PL_hints & HINT_ASSERTING) {
6264 if (PERLDB_ASSERTION && PL_curstash != PL_debstash)
6265 o->op_private |= OPpENTERSUB_DB;
6266 }
8fa7688f 6267 else {
0723351e 6268 delete_op = 1;
8fa7688f
SF		 6269 if (ckWARN(WARN_ASSERTIONS) && !(PL_hints & HINT_ASSERTIONSSEEN)) {
6270 Perl_warner(aTHX_ packWARN(WARN_ASSERTIONS),
6271 "Impossible to activate assertion call");
6272 }
6273 }
06492da6 6274 }
46fc3d4c 6275 }
4633a7c4
LW		 6276 }
6277 }
f5d5a27c 6278 else if (cvop->op_type == OP_METHOD || cvop->op_type == OP_METHOD_NAMED) {
7a52d87a
GS		 6279 if (o2->op_type == OP_CONST)
6280 o2->op_private &= ~OPpCONST_STRICT;
58a40671
GS		 6281 else if (o2->op_type == OP_LIST) {
6282 OP *o = ((UNOP*)o2)->op_first->op_sibling;
6283 if (o && o->op_type == OP_CONST)
6284 o->op_private &= ~OPpCONST_STRICT;
6285 }
7a52d87a 6286 }
3280af22
NIS		 6287 o->op_private |= (PL_hints & HINT_STRICT_REFS);
6288 if (PERLDB_SUB && PL_curstash != PL_debstash)
11343788
MB		 6289 o->op_private |= OPpENTERSUB_DB;
6290 while (o2 != cvop) {
4633a7c4
LW		 6291 if (proto) {
6292 switch (*proto) {
6293 case '\0':
5dc0d613 6294 return too_many_arguments(o, gv_ename(namegv));
4633a7c4
LW		 6295 case ';':
6296 optional = 1;
6297 proto++;
6298 continue;
6299 case '$':
6300 proto++;
6301 arg++;
11343788 6302 scalar(o2);
4633a7c4
LW		 6303 break;
6304 case '%':
6305 case '@':
11343788 6306 list(o2);
4633a7c4
LW		 6307 arg++;
6308 break;
6309 case '&':
6310 proto++;
6311 arg++;
11343788 6312 if (o2->op_type != OP_REFGEN && o2->op_type != OP_UNDEF)
75fc29ea
GS		 6313 bad_type(arg,
6314 arg == 1 ? "block or sub {}" : "sub {}",
6315 gv_ename(namegv), o2);
4633a7c4
LW		 6316 break;
6317 case '*':
2ba6ecf4 6318 /* '*' allows any scalar type, including bareword */
4633a7c4
LW		 6319 proto++;
6320 arg++;
11343788 6321 if (o2->op_type == OP_RV2GV)
2ba6ecf4 6322 goto wrapref; /* autoconvert GLOB -> GLOBref */
7a52d87a
GS		 6323 else if (o2->op_type == OP_CONST)
6324 o2->op_private &= ~OPpCONST_STRICT;
9675f7ac
GS		 6325 else if (o2->op_type == OP_ENTERSUB) {
6326 /* accidental subroutine, revert to bareword */
6327 OP *gvop = ((UNOP*)o2)->op_first;
6328 if (gvop && gvop->op_type == OP_NULL) {
6329 gvop = ((UNOP*)gvop)->op_first;
6330 if (gvop) {
6331 for (; gvop->op_sibling; gvop = gvop->op_sibling)
6332 ;
6333 if (gvop &&
6334 (gvop->op_private & OPpENTERSUB_NOPAREN) &&
6335 (gvop = ((UNOP*)gvop)->op_first) &&
6336 gvop->op_type == OP_GV)
6337 {
638eceb6 6338 GV *gv = cGVOPx_gv(gvop);
9675f7ac 6339 OP *sibling = o2->op_sibling;
2692f720 6340 SV *n = newSVpvn("",0);
9675f7ac 6341 op_free(o2);
2a797ae2 6342 gv_fullname4(n, gv, "", FALSE);
2692f720 6343 o2 = newSVOP(OP_CONST, 0, n);
9675f7ac
GS		 6344 prev->op_sibling = o2;
6345 o2->op_sibling = sibling;
6346 }
6347 }
6348 }
6349 }
2ba6ecf4
GS		 6350 scalar(o2);
6351 break;
5b794e05
JH		 6352 case '[': case ']':
6353 goto oops;
6354 break;
4633a7c4
LW		 6355 case '\\':
6356 proto++;
6357 arg++;
5b794e05 6358 again:
4633a7c4 6359 switch (*proto++) {
5b794e05
JH		 6360 case '[':
6361 if (contextclass++ == 0) {
841d93c8 6362 e = strchr(proto, ']');
5b794e05
JH		 6363 if (!e || e == proto)
6364 goto oops;
6365 }
6366 else
6367 goto oops;
6368 goto again;
6369 break;
6370 case ']':
466bafcd 6371 if (contextclass) {
6867be6d
AL		 6372 char *p = proto;
6373 const char s = *p;
466bafcd
RGS		 6374 contextclass = 0;
6375 *p = '\0';
6376 while (*--p != '[');
1eb1540c 6377 bad_type(arg, Perl_form(aTHX_ "one of %s", p),
466bafcd
RGS		 6378 gv_ename(namegv), o2);
6379 *proto = s;
6380 } else
5b794e05
JH		 6381 goto oops;
6382 break;
4633a7c4 6383 case '*':
5b794e05
JH		 6384 if (o2->op_type == OP_RV2GV)
6385 goto wrapref;
6386 if (!contextclass)
6387 bad_type(arg, "symbol", gv_ename(namegv), o2);
6388 break;
4633a7c4 6389 case '&':
5b794e05
JH		 6390 if (o2->op_type == OP_ENTERSUB)
6391 goto wrapref;
6392 if (!contextclass)
6393 bad_type(arg, "subroutine entry", gv_ename(namegv), o2);
6394 break;
4633a7c4 6395 case '$':
5b794e05
JH		 6396 if (o2->op_type == OP_RV2SV ||
6397 o2->op_type == OP_PADSV ||
6398 o2->op_type == OP_HELEM ||
6399 o2->op_type == OP_AELEM ||
6400 o2->op_type == OP_THREADSV)
6401 goto wrapref;
6402 if (!contextclass)
5dc0d613 6403 bad_type(arg, "scalar", gv_ename(namegv), o2);
5b794e05 6404 break;
4633a7c4 6405 case '@':
5b794e05
JH		 6406 if (o2->op_type == OP_RV2AV ||
6407 o2->op_type == OP_PADAV)
6408 goto wrapref;
6409 if (!contextclass)
5dc0d613 6410 bad_type(arg, "array", gv_ename(namegv), o2);
5b794e05 6411 break;
4633a7c4 6412 case '%':
5b794e05
JH		 6413 if (o2->op_type == OP_RV2HV ||
6414 o2->op_type == OP_PADHV)
6415 goto wrapref;
6416 if (!contextclass)
6417 bad_type(arg, "hash", gv_ename(namegv), o2);
6418 break;
6419 wrapref:
4633a7c4 6420 {
11343788 6421 OP* kid = o2;
6fa846a0 6422 OP* sib = kid->op_sibling;
4633a7c4 6423 kid->op_sibling = 0;
6fa846a0
GS		 6424 o2 = newUNOP(OP_REFGEN, 0, kid);
6425 o2->op_sibling = sib;
e858de61 6426 prev->op_sibling = o2;
4633a7c4 6427 }
841d93c8 6428 if (contextclass && e) {
5b794e05
JH		 6429 proto = e + 1;
6430 contextclass = 0;
6431 }
4633a7c4
LW		 6432 break;
6433 default: goto oops;
6434 }
5b794e05
JH		 6435 if (contextclass)
6436 goto again;
4633a7c4 6437 break;
b1cb66bf 6438 case ' ':
6439 proto++;
6440 continue;
4633a7c4
LW		 6441 default:
6442 oops:
35c1215d
NC		 6443 Perl_croak(aTHX_ "Malformed prototype for %s: %"SVf,
6444 gv_ename(namegv), cv);
4633a7c4
LW		 6445 }
6446 }
6447 else
11343788
MB		 6448 list(o2);
6449 mod(o2, OP_ENTERSUB);
6450 prev = o2;
6451 o2 = o2->op_sibling;
4633a7c4 6452 }
fb73857a 6453 if (proto && !optional &&
6454 (*proto && *proto != '@' && *proto != '%' && *proto != ';'))
5dc0d613 6455 return too_few_arguments(o, gv_ename(namegv));
0723351e 6456 if(delete_op) {
06492da6
SF		 6457 op_free(o);
6458 o=newSVOP(OP_CONST, 0, newSViv(0));
6459 }
11343788 6460 return o;
79072805
LW		 6461}
6462
6463OP *
cea2e8a9 6464Perl_ck_svconst(pTHX_ OP *o)
8990e307 6465{
11343788
MB		 6466 SvREADONLY_on(cSVOPo->op_sv);
6467 return o;
8990e307
LW		 6468}
6469
6470OP *
cea2e8a9 6471Perl_ck_trunc(pTHX_ OP *o)
79072805 6472{
11343788
MB		 6473 if (o->op_flags & OPf_KIDS) {
6474 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 6475
a0d0e21e
LW		 6476 if (kid->op_type == OP_NULL)
6477 kid = (SVOP*)kid->op_sibling;
bb53490d
GS		 6478 if (kid && kid->op_type == OP_CONST &&
6479 (kid->op_private & OPpCONST_BARE))
6480 {
11343788 6481 o->op_flags |= OPf_SPECIAL;
bb53490d
GS		 6482 kid->op_private &= ~OPpCONST_STRICT;
6483 }
79072805 6484 }
11343788 6485 return ck_fun(o);
79072805
LW		 6486}
6487
35fba0d9 6488OP *
bab9c0ac
RGS		 6489Perl_ck_unpack(pTHX_ OP *o)
6490{
6491 OP *kid = cLISTOPo->op_first;
6492 if (kid->op_sibling) {
6493 kid = kid->op_sibling;
6494 if (!kid->op_sibling)
6495 kid->op_sibling = newDEFSVOP();
6496 }
6497 return ck_fun(o);
6498}
6499
6500OP *
35fba0d9
RG		 6501Perl_ck_substr(pTHX_ OP *o)
6502{
6503 o = ck_fun(o);
6504 if ((o->op_flags & OPf_KIDS) && o->op_private == 4) {
6505 OP *kid = cLISTOPo->op_first;
6506
6507 if (kid->op_type == OP_NULL)
6508 kid = kid->op_sibling;
6509 if (kid)
6510 kid->op_flags |= OPf_MOD;
6511
6512 }
6513 return o;
6514}
6515
61b743bb
DM		 6516/* A peephole optimizer. We visit the ops in the order they're to execute.
6517 * See the comments at the top of this file for more details about when
6518 * peep() is called */
463ee0b2 6519
79072805 6520void
864dbfa3 6521Perl_peep(pTHX_ register OP *o)
79072805 6522{
27da23d5 6523 dVAR;
79072805 6524 register OP* oldop = 0;
2d8e6c8d 6525
2814eb74 6526 if (!o || o->op_opt)
79072805 6527 return;
a0d0e21e 6528 ENTER;
462e5cf6 6529 SAVEOP();
7766f137 6530 SAVEVPTR(PL_curcop);
a0d0e21e 6531 for (; o; o = o->op_next) {
2814eb74 6532 if (o->op_opt)
a0d0e21e 6533 break;
533c011a 6534 PL_op = o;
a0d0e21e 6535 switch (o->op_type) {
acb36ea4 6536 case OP_SETSTATE:
a0d0e21e
LW		 6537 case OP_NEXTSTATE:
6538 case OP_DBSTATE:
3280af22 6539 PL_curcop = ((COP*)o); /* for warnings */
2814eb74 6540 o->op_opt = 1;
a0d0e21e
LW		 6541 break;
6542
a0d0e21e 6543 case OP_CONST:
7a52d87a
GS		 6544 if (cSVOPo->op_private & OPpCONST_STRICT)
6545 no_bareword_allowed(o);
7766f137 6546#ifdef USE_ITHREADS
3848b962 6547 case OP_METHOD_NAMED:
7766f137
GS		 6548 /* Relocate sv to the pad for thread safety.
6549 * Despite being a "constant", the SV is written to,
6550 * for reference counts, sv_upgrade() etc. */
6551 if (cSVOP->op_sv) {
6867be6d 6552 const PADOFFSET ix = pad_alloc(OP_CONST, SVs_PADTMP);
330e22d5 6553 if (o->op_type == OP_CONST && SvPADTMP(cSVOPo->op_sv)) {
6a7129a1 6554 /* If op_sv is already a PADTMP then it is being used by
9a049f1c 6555 * some pad, so make a copy. */
dd2155a4
DM		 6556 sv_setsv(PAD_SVl(ix),cSVOPo->op_sv);
6557 SvREADONLY_on(PAD_SVl(ix));
6a7129a1
GS		 6558 SvREFCNT_dec(cSVOPo->op_sv);
6559 }
6560 else {
dd2155a4 6561 SvREFCNT_dec(PAD_SVl(ix));
6a7129a1 6562 SvPADTMP_on(cSVOPo->op_sv);
dd2155a4 6563 PAD_SETSV(ix, cSVOPo->op_sv);
9a049f1c 6564 /* XXX I don't know how this isn't readonly already. */
dd2155a4 6565 SvREADONLY_on(PAD_SVl(ix));
6a7129a1 6566 }
7766f137
GS		 6567 cSVOPo->op_sv = Nullsv;
6568 o->op_targ = ix;
6569 }
6570#endif
2814eb74 6571 o->op_opt = 1;
07447971
GS		 6572 break;
6573
df91b2c5
AE		 6574 case OP_CONCAT:
6575 if (o->op_next && o->op_next->op_type == OP_STRINGIFY) {
6576 if (o->op_next->op_private & OPpTARGET_MY) {
6577 if (o->op_flags & OPf_STACKED) /* chained concats */
6578 goto ignore_optimization;
6579 else {
6580 /* assert(PL_opargs[o->op_type] & OA_TARGLEX); */
6581 o->op_targ = o->op_next->op_targ;
6582 o->op_next->op_targ = 0;
6583 o->op_private |= OPpTARGET_MY;
6584 }
6585 }
6586 op_null(o->op_next);
6587 }
6588 ignore_optimization:
2814eb74 6589 o->op_opt = 1;
df91b2c5 6590 break;
8990e307 6591 case OP_STUB:
54310121 6592 if ((o->op_flags & OPf_WANT) != OPf_WANT_LIST) {
2814eb74 6593 o->op_opt = 1;
54310121 6594 break; /* Scalar stub must produce undef. List stub is noop */
8990e307 6595 }
748a9306 6596 goto nothin;
79072805 6597 case OP_NULL:
acb36ea4
GS		 6598 if (o->op_targ == OP_NEXTSTATE
6599 || o->op_targ == OP_DBSTATE
6600 || o->op_targ == OP_SETSTATE)
6601 {
3280af22 6602 PL_curcop = ((COP*)o);
acb36ea4 6603 }
dad75012
AMS		 6604 /* XXX: We avoid setting op_seq here to prevent later calls
6605 to peep() from mistakenly concluding that optimisation
6606 has already occurred. This doesn't fix the real problem,
6607 though (See 20010220.007). AMS 20010719 */
2814eb74 6608 /* op_seq functionality is now replaced by op_opt */
dad75012
AMS		 6609 if (oldop && o->op_next) {
6610 oldop->op_next = o->op_next;
6611 continue;
6612 }
6613 break;
79072805 6614 case OP_SCALAR:
93a17b20 6615 case OP_LINESEQ:
463ee0b2 6616 case OP_SCOPE:
748a9306 6617 nothin:
a0d0e21e
LW		 6618 if (oldop && o->op_next) {
6619 oldop->op_next = o->op_next;
79072805
LW		 6620 continue;
6621 }
2814eb74 6622 o->op_opt = 1;
79072805
LW		 6623 break;
6624
6a077020 6625 case OP_PADAV:
79072805 6626 case OP_GV:
6a077020
DM		 6627 if (o->op_type == OP_PADAV || o->op_next->op_type == OP_RV2AV) {
6628 OP* pop = (o->op_type == OP_PADAV) ?
6629 o->op_next : o->op_next->op_next;
a0d0e21e 6630 IV i;
f9dc862f 6631 if (pop && pop->op_type == OP_CONST &&
af5acbb4 6632 ((PL_op = pop->op_next)) &&
8990e307 6633 pop->op_next->op_type == OP_AELEM &&
a0d0e21e 6634 !(pop->op_next->op_private &
78f9721b 6635 (OPpLVAL_INTRO|OPpLVAL_DEFER|OPpDEREF|OPpMAYBE_LVSUB)) &&
b0840a2a 6636 (i = SvIV(((SVOP*)pop)->op_sv) - PL_curcop->cop_arybase)
a0d0e21e 6637 <= 255 &&
8990e307
LW		 6638 i >= 0)
6639 {
350de78d 6640 GV *gv;
af5acbb4
DM		 6641 if (cSVOPx(pop)->op_private & OPpCONST_STRICT)
6642 no_bareword_allowed(pop);
6a077020
DM		 6643 if (o->op_type == OP_GV)
6644 op_null(o->op_next);
93c66552
DM		 6645 op_null(pop->op_next);
6646 op_null(pop);
a0d0e21e
LW		 6647 o->op_flags |= pop->op_next->op_flags & OPf_MOD;
6648 o->op_next = pop->op_next->op_next;
22c35a8c 6649 o->op_ppaddr = PL_ppaddr[OP_AELEMFAST];
a0d0e21e 6650 o->op_private = (U8)i;
6a077020
DM		 6651 if (o->op_type == OP_GV) {
6652 gv = cGVOPo_gv;
6653 GvAVn(gv);
6654 }
6655 else
6656 o->op_flags |= OPf_SPECIAL;
6657 o->op_type = OP_AELEMFAST;
6658 }
6659 o->op_opt = 1;
6660 break;
6661 }
6662
6663 if (o->op_next->op_type == OP_RV2SV) {
6664 if (!(o->op_next->op_private & OPpDEREF)) {
6665 op_null(o->op_next);
6666 o->op_private |= o->op_next->op_private & (OPpLVAL_INTRO
6667 | OPpOUR_INTRO);
6668 o->op_next = o->op_next->op_next;
6669 o->op_type = OP_GVSV;
6670 o->op_ppaddr = PL_ppaddr[OP_GVSV];
8990e307 6671 }
79072805 6672 }
e476b1b5 6673 else if ((o->op_private & OPpEARLY_CV) && ckWARN(WARN_PROTOTYPE)) {
638eceb6 6674 GV *gv = cGVOPo_gv;
b15aece3 6675 if (SvTYPE(gv) == SVt_PVGV && GvCV(gv) && SvPVX_const(GvCV(gv))) {
76cd736e
GS		 6676 /* XXX could check prototype here instead of just carping */
6677 SV *sv = sv_newmortal();
6678 gv_efullname3(sv, gv, Nullch);
9014280d 6679 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE),
35c1215d
NC		 6680 "%"SVf"() called too early to check prototype",
6681 sv);
76cd736e
GS		 6682 }
6683 }
89de2904
AMS		 6684 else if (o->op_next->op_type == OP_READLINE
6685 && o->op_next->op_next->op_type == OP_CONCAT
6686 && (o->op_next->op_next->op_flags & OPf_STACKED))
6687 {
d2c45030
AMS		 6688 /* Turn "$a .= <FH>" into an OP_RCATLINE. AMS 20010917 */
6689 o->op_type = OP_RCATLINE;
6690 o->op_flags |= OPf_STACKED;
6691 o->op_ppaddr = PL_ppaddr[OP_RCATLINE];
89de2904 6692 op_null(o->op_next->op_next);
d2c45030 6693 op_null(o->op_next);
89de2904 6694 }
76cd736e 6695
2814eb74 6696 o->op_opt = 1;
79072805
LW		 6697 break;
6698
a0d0e21e 6699 case OP_MAPWHILE:
79072805
LW		 6700 case OP_GREPWHILE:
6701 case OP_AND:
6702 case OP_OR:
c963b151 6703 case OP_DOR:
2c2d71f5
JH		 6704 case OP_ANDASSIGN:
6705 case OP_ORASSIGN:
c963b151 6706 case OP_DORASSIGN:
1a67a97c
SM		 6707 case OP_COND_EXPR:
6708 case OP_RANGE:
2814eb74 6709 o->op_opt = 1;
fd4d1407
IZ		 6710 while (cLOGOP->op_other->op_type == OP_NULL)
6711 cLOGOP->op_other = cLOGOP->op_other->op_next;
a2efc822 6712 peep(cLOGOP->op_other); /* Recursive calls are not replaced by fptr calls */
79072805
LW		 6713 break;
6714
79072805 6715 case OP_ENTERLOOP:
9c2ca71a 6716 case OP_ENTERITER:
2814eb74 6717 o->op_opt = 1;
58cccf98
SM		 6718 while (cLOOP->op_redoop->op_type == OP_NULL)
6719 cLOOP->op_redoop = cLOOP->op_redoop->op_next;
79072805 6720 peep(cLOOP->op_redoop);
58cccf98
SM		 6721 while (cLOOP->op_nextop->op_type == OP_NULL)
6722 cLOOP->op_nextop = cLOOP->op_nextop->op_next;
79072805 6723 peep(cLOOP->op_nextop);
58cccf98
SM		 6724 while (cLOOP->op_lastop->op_type == OP_NULL)
6725 cLOOP->op_lastop = cLOOP->op_lastop->op_next;
79072805
LW		 6726 peep(cLOOP->op_lastop);
6727 break;
6728
8782bef2 6729 case OP_QR:
79072805
LW		 6730 case OP_MATCH:
6731 case OP_SUBST:
2814eb74 6732 o->op_opt = 1;
9041c2e3 6733 while (cPMOP->op_pmreplstart &&
58cccf98
SM		 6734 cPMOP->op_pmreplstart->op_type == OP_NULL)
6735 cPMOP->op_pmreplstart = cPMOP->op_pmreplstart->op_next;
a0d0e21e 6736 peep(cPMOP->op_pmreplstart);
79072805
LW		 6737 break;
6738
a0d0e21e 6739 case OP_EXEC:
2814eb74 6740 o->op_opt = 1;
1c846c1f 6741 if (ckWARN(WARN_SYNTAX) && o->op_next
599cee73 6742 && o->op_next->op_type == OP_NEXTSTATE) {
a0d0e21e 6743 if (o->op_next->op_sibling &&
20408e3c
GS		 6744 o->op_next->op_sibling->op_type != OP_EXIT &&
6745 o->op_next->op_sibling->op_type != OP_WARN &&
a0d0e21e 6746 o->op_next->op_sibling->op_type != OP_DIE) {
6867be6d 6747 const line_t oldline = CopLINE(PL_curcop);
a0d0e21e 6748
57843af0 6749 CopLINE_set(PL_curcop, CopLINE((COP*)o->op_next));
9014280d 6750 Perl_warner(aTHX_ packWARN(WARN_EXEC),
eeb6a2c9 6751 "Statement unlikely to be reached");
9014280d 6752 Perl_warner(aTHX_ packWARN(WARN_EXEC),
cc507455 6753 "\t(Maybe you meant system() when you said exec()?)\n");
57843af0 6754 CopLINE_set(PL_curcop, oldline);
a0d0e21e
LW		 6755 }
6756 }
6757 break;
b2ffa427 6758
c750a3ec 6759 case OP_HELEM: {
e75d1f10 6760 UNOP *rop;
6d822dc4 6761 SV *lexname;
e75d1f10 6762 GV **fields;
6d822dc4 6763 SV **svp, *sv;
d5263905 6764 const char *key = NULL;
c750a3ec 6765 STRLEN keylen;
b2ffa427 6766
2814eb74 6767 o->op_opt = 1;
1c846c1f
NIS		 6768
6769 if (((BINOP*)o)->op_last->op_type != OP_CONST)
c750a3ec 6770 break;
1c846c1f
NIS		 6771
6772 /* Make the CONST have a shared SV */
6773 svp = cSVOPx_svp(((BINOP*)o)->op_last);
3049cdab 6774 if ((!SvFAKE(sv = *svp) || !SvREADONLY(sv)) && !IS_PADCONST(sv)) {
d5263905 6775 key = SvPV_const(sv, keylen);
25716404
GS		 6776 lexname = newSVpvn_share(key,
6777 SvUTF8(sv) ? -(I32)keylen : keylen,
6778 0);
1c846c1f
NIS		 6779 SvREFCNT_dec(sv);
6780 *svp = lexname;
6781 }
e75d1f10
RD		 6782
6783 if ((o->op_private & (OPpLVAL_INTRO)))
6784 break;
6785
6786 rop = (UNOP*)((BINOP*)o)->op_first;
6787 if (rop->op_type != OP_RV2HV || rop->op_first->op_type != OP_PADSV)
6788 break;
6789 lexname = *av_fetch(PL_comppad_name, rop->op_first->op_targ, TRUE);
6790 if (!(SvFLAGS(lexname) & SVpad_TYPED))
6791 break;
6792 fields = (GV**)hv_fetch(SvSTASH(lexname), "FIELDS", 6, FALSE);
6793 if (!fields || !GvHV(*fields))
6794 break;
93524f2b 6795 key = SvPV_const(*svp, keylen);
e75d1f10
RD		 6796 if (!hv_fetch(GvHV(*fields), key,
6797 SvUTF8(*svp) ? -(I32)keylen : keylen, FALSE))
6798 {
6799 Perl_croak(aTHX_ "No such class field \"%s\" "
6800 "in variable %s of type %s",
93524f2b 6801 key, SvPV_nolen_const(lexname), HvNAME_get(SvSTASH(lexname)));
e75d1f10
RD		 6802 }
6803
6d822dc4
MS		 6804 break;
6805 }
c750a3ec 6806
e75d1f10
RD		 6807 case OP_HSLICE: {
6808 UNOP *rop;
6809 SV *lexname;
6810 GV **fields;
6811 SV **svp;
93524f2b 6812 const char *key;
e75d1f10
RD		 6813 STRLEN keylen;
6814 SVOP *first_key_op, *key_op;
6815
6816 if ((o->op_private & (OPpLVAL_INTRO))
6817 /* I bet there's always a pushmark... */
6818 || ((LISTOP*)o)->op_first->op_sibling->op_type != OP_LIST)
6819 /* hmmm, no optimization if list contains only one key. */
6820 break;
6821 rop = (UNOP*)((LISTOP*)o)->op_last;
6822 if (rop->op_type != OP_RV2HV)
6823 break;
6824 if (rop->op_first->op_type == OP_PADSV)
6825 /* @$hash{qw(keys here)} */
6826 rop = (UNOP*)rop->op_first;
6827 else {
6828 /* @{$hash}{qw(keys here)} */
6829 if (rop->op_first->op_type == OP_SCOPE
6830 && cLISTOPx(rop->op_first)->op_last->op_type == OP_PADSV)
6831 {
6832 rop = (UNOP*)cLISTOPx(rop->op_first)->op_last;
6833 }
6834 else
6835 break;
6836 }
6837
6838 lexname = *av_fetch(PL_comppad_name, rop->op_targ, TRUE);
6839 if (!(SvFLAGS(lexname) & SVpad_TYPED))
6840 break;
6841 fields = (GV**)hv_fetch(SvSTASH(lexname), "FIELDS", 6, FALSE);
6842 if (!fields || !GvHV(*fields))
6843 break;
6844 /* Again guessing that the pushmark can be jumped over.... */
6845 first_key_op = (SVOP*)((LISTOP*)((LISTOP*)o)->op_first->op_sibling)
6846 ->op_first->op_sibling;
6847 for (key_op = first_key_op; key_op;
6848 key_op = (SVOP*)key_op->op_sibling) {
6849 if (key_op->op_type != OP_CONST)
6850 continue;
6851 svp = cSVOPx_svp(key_op);
93524f2b 6852 key = SvPV_const(*svp, keylen);
e75d1f10
RD		 6853 if (!hv_fetch(GvHV(*fields), key,
6854 SvUTF8(*svp) ? -(I32)keylen : keylen, FALSE))
6855 {
6856 Perl_croak(aTHX_ "No such class field \"%s\" "
6857 "in variable %s of type %s",
bfcb3514 6858 key, SvPV_nolen(lexname), HvNAME_get(SvSTASH(lexname)));
e75d1f10
RD		 6859 }
6860 }
6861 break;
6862 }
6863
fe1bc4cf 6864 case OP_SORT: {
fe1bc4cf
DM		 6865 /* will point to RV2AV or PADAV op on LHS/RHS of assign */
6866 OP *oleft, *oright;
6867 OP *o2;
6868
fe1bc4cf
DM		 6869 /* check that RHS of sort is a single plain array */
6870 oright = cUNOPo->op_first;
6871 if (!oright || oright->op_type != OP_PUSHMARK)
6872 break;
471178c0
NC		 6873
6874 /* reverse sort ... can be optimised. */
6875 if (!cUNOPo->op_sibling) {
6876 /* Nothing follows us on the list. */
6877 OP *reverse = o->op_next;
6878
6879 if (reverse->op_type == OP_REVERSE &&
6880 (reverse->op_flags & OPf_WANT) == OPf_WANT_LIST) {
6881 OP *pushmark = cUNOPx(reverse)->op_first;
6882 if (pushmark && (pushmark->op_type == OP_PUSHMARK)
6883 && (cUNOPx(pushmark)->op_sibling == o)) {
6884 /* reverse -> pushmark -> sort */
6885 o->op_private |= OPpSORT_REVERSE;
6886 op_null(reverse);
6887 pushmark->op_next = oright->op_next;
6888 op_null(oright);
6889 }
6890 }
6891 }
6892
6893 /* make @a = sort @a act in-place */
6894
6895 o->op_opt = 1;
6896
fe1bc4cf
DM		 6897 oright = cUNOPx(oright)->op_sibling;
6898 if (!oright)
6899 break;
6900 if (oright->op_type == OP_NULL) { /* skip sort block/sub */
6901 oright = cUNOPx(oright)->op_sibling;
6902 }
6903
6904 if (!oright ||
6905 (oright->op_type != OP_RV2AV && oright->op_type != OP_PADAV)
6906 || oright->op_next != o
6907 || (oright->op_private & OPpLVAL_INTRO)
6908 )
6909 break;
6910
6911 /* o2 follows the chain of op_nexts through the LHS of the
6912 * assign (if any) to the aassign op itself */
6913 o2 = o->op_next;
6914 if (!o2 || o2->op_type != OP_NULL)
6915 break;
6916 o2 = o2->op_next;
6917 if (!o2 || o2->op_type != OP_PUSHMARK)
6918 break;
6919 o2 = o2->op_next;
6920 if (o2 && o2->op_type == OP_GV)
6921 o2 = o2->op_next;
6922 if (!o2
6923 || (o2->op_type != OP_PADAV && o2->op_type != OP_RV2AV)
6924 || (o2->op_private & OPpLVAL_INTRO)
6925 )
6926 break;
6927 oleft = o2;
6928 o2 = o2->op_next;
6929 if (!o2 || o2->op_type != OP_NULL)
6930 break;
6931 o2 = o2->op_next;
6932 if (!o2 || o2->op_type != OP_AASSIGN
6933 || (o2->op_flags & OPf_WANT) != OPf_WANT_VOID)
6934 break;
6935
db7511db
DM		 6936 /* check that the sort is the first arg on RHS of assign */
6937
6938 o2 = cUNOPx(o2)->op_first;
6939 if (!o2 || o2->op_type != OP_NULL)
6940 break;
6941 o2 = cUNOPx(o2)->op_first;
6942 if (!o2 || o2->op_type != OP_PUSHMARK)
6943 break;
6944 if (o2->op_sibling != o)
6945 break;
6946
fe1bc4cf
DM		 6947 /* check the array is the same on both sides */
6948 if (oleft->op_type == OP_RV2AV) {
6949 if (oright->op_type != OP_RV2AV
6950 || !cUNOPx(oright)->op_first
6951 || cUNOPx(oright)->op_first->op_type != OP_GV
6952 || cGVOPx_gv(cUNOPx(oleft)->op_first) !=
6953 cGVOPx_gv(cUNOPx(oright)->op_first)
6954 )
6955 break;
6956 }
6957 else if (oright->op_type != OP_PADAV
6958 || oright->op_targ != oleft->op_targ
6959 )
6960 break;
6961
6962 /* transfer MODishness etc from LHS arg to RHS arg */
6963 oright->op_flags = oleft->op_flags;
6964 o->op_private |= OPpSORT_INPLACE;
6965
6966 /* excise push->gv->rv2av->null->aassign */
6967 o2 = o->op_next->op_next;
6968 op_null(o2); /* PUSHMARK */
6969 o2 = o2->op_next;
6970 if (o2->op_type == OP_GV) {
6971 op_null(o2); /* GV */
6972 o2 = o2->op_next;
6973 }
6974 op_null(o2); /* RV2AV or PADAV */
6975 o2 = o2->op_next->op_next;
6976 op_null(o2); /* AASSIGN */
6977
6978 o->op_next = o2->op_next;
6979
6980 break;
6981 }
ef3e5ea9
NC		 6982
6983 case OP_REVERSE: {
e682d7b7 6984 OP *ourmark, *theirmark, *ourlast, *iter, *expushmark, *rv2av;
ce335f37 6985 OP *gvop = NULL;
ef3e5ea9
NC		 6986 LISTOP *enter, *exlist;
6987 o->op_opt = 1;
6988
6989 enter = (LISTOP *) o->op_next;
6990 if (!enter)
6991 break;
6992 if (enter->op_type == OP_NULL) {
6993 enter = (LISTOP *) enter->op_next;
6994 if (!enter)
6995 break;
6996 }
d46f46af
NC		 6997 /* for $a (...) will have OP_GV then OP_RV2GV here.
6998 for (...) just has an OP_GV. */
ce335f37
NC		 6999 if (enter->op_type == OP_GV) {
7000 gvop = (OP *) enter;
7001 enter = (LISTOP *) enter->op_next;
7002 if (!enter)
7003 break;
d46f46af
NC		 7004 if (enter->op_type == OP_RV2GV) {
7005 enter = (LISTOP *) enter->op_next;
7006 if (!enter)
ce335f37 7007 break;
d46f46af 7008 }
ce335f37
NC		 7009 }
7010
ef3e5ea9
NC		 7011 if (enter->op_type != OP_ENTERITER)
7012 break;
7013
7014 iter = enter->op_next;
7015 if (!iter || iter->op_type != OP_ITER)
7016 break;
7017
ce335f37
NC		 7018 expushmark = enter->op_first;
7019 if (!expushmark || expushmark->op_type != OP_NULL
7020 || expushmark->op_targ != OP_PUSHMARK)
7021 break;
7022
7023 exlist = (LISTOP *) expushmark->op_sibling;
ef3e5ea9
NC		 7024 if (!exlist || exlist->op_type != OP_NULL
7025 || exlist->op_targ != OP_LIST)
7026 break;
7027
7028 if (exlist->op_last != o) {
7029 /* Mmm. Was expecting to point back to this op. */
7030 break;
7031 }
7032 theirmark = exlist->op_first;
7033 if (!theirmark || theirmark->op_type != OP_PUSHMARK)
7034 break;
7035
c491ecac 7036 if (theirmark->op_sibling != o) {
ef3e5ea9
NC		 7037 /* There's something between the mark and the reverse, eg
7038 for (1, reverse (...))
7039 so no go. */
7040 break;
7041 }
7042
c491ecac
NC		 7043 ourmark = ((LISTOP *)o)->op_first;
7044 if (!ourmark || ourmark->op_type != OP_PUSHMARK)
7045 break;
7046
ef3e5ea9
NC		 7047 ourlast = ((LISTOP *)o)->op_last;
7048 if (!ourlast || ourlast->op_next != o)
7049 break;
7050
e682d7b7
NC		 7051 rv2av = ourmark->op_sibling;
7052 if (rv2av && rv2av->op_type == OP_RV2AV && rv2av->op_sibling == 0
7053 && rv2av->op_flags == (OPf_WANT_LIST | OPf_KIDS)
7054 && enter->op_flags == (OPf_WANT_LIST | OPf_KIDS)) {
7055 /* We're just reversing a single array. */
7056 rv2av->op_flags = OPf_WANT_SCALAR | OPf_KIDS | OPf_REF;
7057 enter->op_flags |= OPf_STACKED;
7058 }
7059
ef3e5ea9
NC		 7060 /* We don't have control over who points to theirmark, so sacrifice
7061 ours. */
7062 theirmark->op_next = ourmark->op_next;
7063 theirmark->op_flags = ourmark->op_flags;
ce335f37 7064 ourlast->op_next = gvop ? gvop : (OP *) enter;
ef3e5ea9
NC		 7065 op_null(ourmark);
7066 op_null(o);
7067 enter->op_private |= OPpITER_REVERSED;
7068 iter->op_private |= OPpITER_REVERSED;
7069
7070 break;
7071 }
fe1bc4cf 7072
79072805 7073 default:
2814eb74 7074 o->op_opt = 1;
79072805
LW		 7075 break;
7076 }
a0d0e21e 7077 oldop = o;
79072805 7078 }
a0d0e21e 7079 LEAVE;
79072805 7080}
beab0874 7081
1cb0ed9b
RGS		 7082char*
7083Perl_custom_op_name(pTHX_ const OP* o)
53e06cf0 7084{
e1ec3a88 7085 const IV index = PTR2IV(o->op_ppaddr);
53e06cf0
SC		 7086 SV* keysv;
7087 HE* he;
7088
7089 if (!PL_custom_op_names) /* This probably shouldn't happen */
27da23d5 7090 return (char *)PL_op_name[OP_CUSTOM];
53e06cf0
SC		 7091
7092 keysv = sv_2mortal(newSViv(index));
7093
7094 he = hv_fetch_ent(PL_custom_op_names, keysv, 0, 0);
7095 if (!he)
27da23d5 7096 return (char *)PL_op_name[OP_CUSTOM]; /* Don't know who you are */
53e06cf0
SC		 7097
7098 return SvPV_nolen(HeVAL(he));
7099}
7100
1cb0ed9b
RGS		 7101char*
7102Perl_custom_op_desc(pTHX_ const OP* o)
53e06cf0 7103{
e1ec3a88 7104 const IV index = PTR2IV(o->op_ppaddr);
53e06cf0
SC		 7105 SV* keysv;
7106 HE* he;
7107
7108 if (!PL_custom_op_descs)
27da23d5 7109 return (char *)PL_op_desc[OP_CUSTOM];
53e06cf0
SC		 7110
7111 keysv = sv_2mortal(newSViv(index));
7112
7113 he = hv_fetch_ent(PL_custom_op_descs, keysv, 0, 0);
7114 if (!he)
27da23d5 7115 return (char *)PL_op_desc[OP_CUSTOM];
53e06cf0
SC		 7116
7117 return SvPV_nolen(HeVAL(he));
7118}
19e8ce8e 7119
beab0874
JT		 7120#include "XSUB.h"
7121
7122/* Efficient sub that returns a constant scalar value. */
7123static void
acfe0abc 7124const_sv_xsub(pTHX_ CV* cv)
beab0874
JT		 7125{
7126 dXSARGS;
9cbac4c7
DM		 7127 if (items != 0) {
7128#if 0
7129 Perl_croak(aTHX_ "usage: %s::%s()",
bfcb3514 7130 HvNAME_get(GvSTASH(CvGV(cv))), GvNAME(CvGV(cv)));
9cbac4c7
DM		 7131#endif
7132 }
9a049f1c 7133 EXTEND(sp, 1);
0768512c 7134 ST(0) = (SV*)XSANY.any_ptr;
beab0874
JT		 7135 XSRETURN(1);
7136}
4946a0fa
NC		 7137
7138/*
7139 * Local variables:
7140 * c-indentation-style: bsd
7141 * c-basic-offset: 4
7142 * indent-tabs-mode: t
7143 * End:
7144 *
37442d52
RGS		 7145 * ex: set ts=8 sts=4 sw=4 noet:
7146 */
Unnamed repository; edit this file 'description' to name the repository.