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Re: [PATCH] undup
[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{
aec46f14
AL		 131 I32 ** const ptr = (I32 **) op;
132 I32 * const slab = ptr[-1];
5a8e194f
NIS		 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 163{
46c461b5 164 SV* const 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) {
890ce7af 1639 const char * const 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
041457d9 1770 if ( (left->op_type == OP_RV2AV ||
599cee73
PM		 1771 left->op_type == OP_RV2HV ||
1772 left->op_type == OP_PADAV ||
041457d9
DM		 1773 left->op_type == OP_PADHV)
1774 && ckWARN(WARN_MISC))
1775 {
e1ec3a88 1776 const char *desc = PL_op_desc[(right->op_type == OP_SUBST ||
599cee73
PM		 1777 right->op_type == OP_TRANS)
1778 ? right->op_type : OP_MATCH];
dff6d3cd
GS		 1779 const char *sample = ((left->op_type == OP_RV2AV ||
1780 left->op_type == OP_PADAV)
1781 ? "@array" : "%hash");
9014280d 1782 Perl_warner(aTHX_ packWARN(WARN_MISC),
1c846c1f 1783 "Applying %s to %s will act on scalar(%s)",
599cee73 1784 desc, sample, sample);
2ae324a7 1785 }
1786
5cc9e5c9
RH		 1787 if (right->op_type == OP_CONST &&
1788 cSVOPx(right)->op_private & OPpCONST_BARE &&
1789 cSVOPx(right)->op_private & OPpCONST_STRICT)
1790 {
1791 no_bareword_allowed(right);
1792 }
1793
59f00321
RGS		 1794 ismatchop = right->op_type == OP_MATCH ||
1795 right->op_type == OP_SUBST ||
1796 right->op_type == OP_TRANS;
1797 if (ismatchop && right->op_private & OPpTARGET_MY) {
1798 right->op_targ = 0;
1799 right->op_private &= ~OPpTARGET_MY;
1800 }
1801 if (!(right->op_flags & OPf_STACKED) && ismatchop) {
79072805 1802 right->op_flags |= OPf_STACKED;
18808301
JH		 1803 if (right->op_type != OP_MATCH &&
1804 ! (right->op_type == OP_TRANS &&
1805 right->op_private & OPpTRANS_IDENTICAL))
463ee0b2 1806 left = mod(left, right->op_type);
79072805 1807 if (right->op_type == OP_TRANS)
11343788 1808 o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805 1809 else
11343788 1810 o = prepend_elem(right->op_type, scalar(left), right);
79072805 1811 if (type == OP_NOT)
11343788
MB		 1812 return newUNOP(OP_NOT, 0, scalar(o));
1813 return o;
79072805
LW		 1814 }
1815 else
1816 return bind_match(type, left,
131b3ad0 1817 pmruntime(newPMOP(OP_MATCH, 0), right, 0));
79072805
LW		 1818}
1819
1820OP *
864dbfa3 1821Perl_invert(pTHX_ OP *o)
79072805 1822{
11343788
MB		 1823 if (!o)
1824 return o;
79072805 1825 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
11343788 1826 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1827}
1828
1829OP *
864dbfa3 1830Perl_scope(pTHX_ OP *o)
79072805 1831{
27da23d5 1832 dVAR;
79072805 1833 if (o) {
3280af22 1834 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || PL_tainting) {
463ee0b2
LW		 1835 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1836 o->op_type = OP_LEAVE;
22c35a8c 1837 o->op_ppaddr = PL_ppaddr[OP_LEAVE];
463ee0b2 1838 }
fdb22418
HS		 1839 else if (o->op_type == OP_LINESEQ) {
1840 OP *kid;
1841 o->op_type = OP_SCOPE;
1842 o->op_ppaddr = PL_ppaddr[OP_SCOPE];
1843 kid = ((LISTOP*)o)->op_first;
1844 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE)
1845 op_null(kid);
463ee0b2 1846 }
fdb22418
HS		 1847 else
1848 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
79072805
LW		 1849 }
1850 return o;
1851}
1852
dfa41748 1853/* XXX kept for BINCOMPAT only */
b3ac6de7 1854void
864dbfa3 1855Perl_save_hints(pTHX)
b3ac6de7 1856{
dfa41748 1857 Perl_croak(aTHX_ "internal error: obsolete function save_hints() called");
b3ac6de7
IZ		 1858}
1859
a0d0e21e 1860int
864dbfa3 1861Perl_block_start(pTHX_ int full)
79072805 1862{
73d840c0 1863 const int retval = PL_savestack_ix;
dd2155a4 1864 pad_block_start(full);
b3ac6de7 1865 SAVEHINTS();
3280af22 1866 PL_hints &= ~HINT_BLOCK_SCOPE;
1c846c1f 1867 SAVESPTR(PL_compiling.cop_warnings);
0453d815 1868 if (! specialWARN(PL_compiling.cop_warnings)) {
599cee73
PM		 1869 PL_compiling.cop_warnings = newSVsv(PL_compiling.cop_warnings) ;
1870 SAVEFREESV(PL_compiling.cop_warnings) ;
1871 }
ac27b0f5
NIS		 1872 SAVESPTR(PL_compiling.cop_io);
1873 if (! specialCopIO(PL_compiling.cop_io)) {
1874 PL_compiling.cop_io = newSVsv(PL_compiling.cop_io) ;
1875 SAVEFREESV(PL_compiling.cop_io) ;
1876 }
a0d0e21e
LW		 1877 return retval;
1878}
1879
1880OP*
864dbfa3 1881Perl_block_end(pTHX_ I32 floor, OP *seq)
a0d0e21e 1882{
6867be6d 1883 const int needblockscope = PL_hints & HINT_BLOCK_SCOPE;
e9f19e3c 1884 OP* retval = scalarseq(seq);
e9818f4e 1885 LEAVE_SCOPE(floor);
eb160463 1886 PL_compiling.op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
a0d0e21e 1887 if (needblockscope)
3280af22 1888 PL_hints |= HINT_BLOCK_SCOPE; /* propagate out */
dd2155a4 1889 pad_leavemy();
a0d0e21e
LW		 1890 return retval;
1891}
1892
76e3520e 1893STATIC OP *
cea2e8a9 1894S_newDEFSVOP(pTHX)
54b9620d 1895{
6867be6d 1896 const I32 offset = pad_findmy("$_");
59f00321
RGS		 1897 if (offset == NOT_IN_PAD || PAD_COMPNAME_FLAGS(offset) & SVpad_OUR) {
1898 return newSVREF(newGVOP(OP_GV, 0, PL_defgv));
1899 }
1900 else {
1901 OP *o = newOP(OP_PADSV, 0);
1902 o->op_targ = offset;
1903 return o;
1904 }
54b9620d
MB		 1905}
1906
a0d0e21e 1907void
864dbfa3 1908Perl_newPROG(pTHX_ OP *o)
a0d0e21e 1909{
3280af22 1910 if (PL_in_eval) {
b295d113
TH		 1911 if (PL_eval_root)
1912 return;
faef0170
HS		 1913 PL_eval_root = newUNOP(OP_LEAVEEVAL,
1914 ((PL_in_eval & EVAL_KEEPERR)
1915 ? OPf_SPECIAL : 0), o);
3280af22 1916 PL_eval_start = linklist(PL_eval_root);
7934575e
GS		 1917 PL_eval_root->op_private |= OPpREFCOUNTED;
1918 OpREFCNT_set(PL_eval_root, 1);
3280af22 1919 PL_eval_root->op_next = 0;
a2efc822 1920 CALL_PEEP(PL_eval_start);
a0d0e21e
LW		 1921 }
1922 else {
6be89cf9
AE		 1923 if (o->op_type == OP_STUB) {
1924 PL_comppad_name = 0;
1925 PL_compcv = 0;
2a4f803a 1926 FreeOp(o);
a0d0e21e 1927 return;
6be89cf9 1928 }
3280af22
NIS		 1929 PL_main_root = scope(sawparens(scalarvoid(o)));
1930 PL_curcop = &PL_compiling;
1931 PL_main_start = LINKLIST(PL_main_root);
7934575e
GS		 1932 PL_main_root->op_private |= OPpREFCOUNTED;
1933 OpREFCNT_set(PL_main_root, 1);
3280af22 1934 PL_main_root->op_next = 0;
a2efc822 1935 CALL_PEEP(PL_main_start);
3280af22 1936 PL_compcv = 0;
3841441e 1937
4fdae800 1938 /* Register with debugger */
84902520 1939 if (PERLDB_INTER) {
864dbfa3 1940 CV *cv = get_cv("DB::postponed", FALSE);
3841441e
CS		 1941 if (cv) {
1942 dSP;
924508f0 1943 PUSHMARK(SP);
cc49e20b 1944 XPUSHs((SV*)CopFILEGV(&PL_compiling));
3841441e 1945 PUTBACK;
864dbfa3 1946 call_sv((SV*)cv, G_DISCARD);
3841441e
CS		 1947 }
1948 }
79072805 1949 }
79072805
LW		 1950}
1951
1952OP *
864dbfa3 1953Perl_localize(pTHX_ OP *o, I32 lex)
79072805
LW		 1954{
1955 if (o->op_flags & OPf_PARENS)
d2be0de5
YST		 1956/* [perl #17376]: this appears to be premature, and results in code such as
1957 C< our(%x); > executing in list mode rather than void mode */
1958#if 0
79072805 1959 list(o);
d2be0de5
YST		 1960#else
1961 ;
1962#endif
8990e307 1963 else {
041457d9
DM		 1964 if ( PL_bufptr > PL_oldbufptr && PL_bufptr[-1] == ','
1965 && ckWARN(WARN_PARENTHESIS))
64420d0d
JH		 1966 {
1967 char *s = PL_bufptr;
bac662ee 1968 bool sigil = FALSE;
64420d0d 1969
8473848f 1970 /* some heuristics to detect a potential error */
bac662ee 1971 while (*s && (strchr(", \t\n", *s)))
64420d0d 1972 s++;
8473848f 1973
bac662ee
TS		 1974 while (1) {
1975 if (*s && strchr("@$%*", *s) && *++s
1976 && (isALNUM(*s) || UTF8_IS_CONTINUED(*s))) {
1977 s++;
1978 sigil = TRUE;
1979 while (*s && (isALNUM(*s) || UTF8_IS_CONTINUED(*s)))
1980 s++;
1981 while (*s && (strchr(", \t\n", *s)))
1982 s++;
1983 }
1984 else
1985 break;
1986 }
1987 if (sigil && (*s == ';' || *s == '=')) {
1988 Perl_warner(aTHX_ packWARN(WARN_PARENTHESIS),
8473848f
RGS		 1989 "Parentheses missing around \"%s\" list",
1990 lex ? (PL_in_my == KEY_our ? "our" : "my")
1991 : "local");
1992 }
8990e307
LW		 1993 }
1994 }
93a17b20 1995 if (lex)
eb64745e 1996 o = my(o);
93a17b20 1997 else
eb64745e
GS		 1998 o = mod(o, OP_NULL); /* a bit kludgey */
1999 PL_in_my = FALSE;
2000 PL_in_my_stash = Nullhv;
2001 return o;
79072805
LW		 2002}
2003
2004OP *
864dbfa3 2005Perl_jmaybe(pTHX_ OP *o)
79072805
LW		 2006{
2007 if (o->op_type == OP_LIST) {
554b3eca 2008 OP *o2;
554b3eca 2009 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
554b3eca 2010 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 2011 }
2012 return o;
2013}
2014
2015OP *
864dbfa3 2016Perl_fold_constants(pTHX_ register OP *o)
79072805 2017{
27da23d5 2018 dVAR;
79072805
LW		 2019 register OP *curop;
2020 I32 type = o->op_type;
748a9306 2021 SV *sv;
79072805 2022
22c35a8c 2023 if (PL_opargs[type] & OA_RETSCALAR)
79072805 2024 scalar(o);
b162f9ea 2025 if (PL_opargs[type] & OA_TARGET && !o->op_targ)
ed6116ce 2026 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 2027
eac055e9
GS		 2028 /* integerize op, unless it happens to be C<-foo>.
2029 * XXX should pp_i_negate() do magic string negation instead? */
2030 if ((PL_opargs[type] & OA_OTHERINT) && (PL_hints & HINT_INTEGER)
2031 && !(type == OP_NEGATE && cUNOPo->op_first->op_type == OP_CONST
2032 && (cUNOPo->op_first->op_private & OPpCONST_BARE)))
2033 {
22c35a8c 2034 o->op_ppaddr = PL_ppaddr[type = ++(o->op_type)];
eac055e9 2035 }
85e6fe83 2036
22c35a8c 2037 if (!(PL_opargs[type] & OA_FOLDCONST))
79072805
LW		 2038 goto nope;
2039
de939608 2040 switch (type) {
7a52d87a
GS		 2041 case OP_NEGATE:
2042 /* XXX might want a ck_negate() for this */
2043 cUNOPo->op_first->op_private &= ~OPpCONST_STRICT;
2044 break;
de939608
CS		 2045 case OP_SPRINTF:
2046 case OP_UCFIRST:
2047 case OP_LCFIRST:
2048 case OP_UC:
2049 case OP_LC:
69dcf70c
MB		 2050 case OP_SLT:
2051 case OP_SGT:
2052 case OP_SLE:
2053 case OP_SGE:
2054 case OP_SCMP:
2de3dbcc
JH		 2055 /* XXX what about the numeric ops? */
2056 if (PL_hints & HINT_LOCALE)
de939608
CS		 2057 goto nope;
2058 }
2059
3280af22 2060 if (PL_error_count)
a0d0e21e
LW		 2061 goto nope; /* Don't try to run w/ errors */
2062
79072805 2063 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
11fa937b
GS		 2064 if ((curop->op_type != OP_CONST ||
2065 (curop->op_private & OPpCONST_BARE)) &&
7a52d87a
GS		 2066 curop->op_type != OP_LIST &&
2067 curop->op_type != OP_SCALAR &&
2068 curop->op_type != OP_NULL &&
2069 curop->op_type != OP_PUSHMARK)
2070 {
79072805
LW		 2071 goto nope;
2072 }
2073 }
2074
2075 curop = LINKLIST(o);
2076 o->op_next = 0;
533c011a 2077 PL_op = curop;
cea2e8a9 2078 CALLRUNOPS(aTHX);
3280af22 2079 sv = *(PL_stack_sp--);
748a9306 2080 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
dd2155a4 2081 pad_swipe(o->op_targ, FALSE);
748a9306
LW		 2082 else if (SvTEMP(sv)) { /* grab mortal temp? */
2083 (void)SvREFCNT_inc(sv);
2084 SvTEMP_off(sv);
85e6fe83 2085 }
79072805
LW		 2086 op_free(o);
2087 if (type == OP_RV2GV)
b1cb66bf 2088 return newGVOP(OP_GV, 0, (GV*)sv);
52a96ae6 2089 return newSVOP(OP_CONST, 0, sv);
aeea060c 2090
79072805 2091 nope:
79072805
LW		 2092 return o;
2093}
2094
2095OP *
864dbfa3 2096Perl_gen_constant_list(pTHX_ register OP *o)
79072805 2097{
27da23d5 2098 dVAR;
79072805 2099 register OP *curop;
6867be6d 2100 const I32 oldtmps_floor = PL_tmps_floor;
79072805 2101
a0d0e21e 2102 list(o);
3280af22 2103 if (PL_error_count)
a0d0e21e
LW		 2104 return o; /* Don't attempt to run with errors */
2105
533c011a 2106 PL_op = curop = LINKLIST(o);
a0d0e21e 2107 o->op_next = 0;
a2efc822 2108 CALL_PEEP(curop);
cea2e8a9
GS		 2109 pp_pushmark();
2110 CALLRUNOPS(aTHX);
533c011a 2111 PL_op = curop;
cea2e8a9 2112 pp_anonlist();
3280af22 2113 PL_tmps_floor = oldtmps_floor;
79072805
LW		 2114
2115 o->op_type = OP_RV2AV;
22c35a8c 2116 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
fb53bbb2
SG		 2117 o->op_flags &= ~OPf_REF; /* treat \(1..2) like an ordinary list */
2118 o->op_flags |= OPf_PARENS; /* and flatten \(1..2,3) */
2814eb74 2119 o->op_opt = 0; /* needs to be revisited in peep() */
79072805 2120 curop = ((UNOP*)o)->op_first;
3280af22 2121 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*PL_stack_sp--));
79072805 2122 op_free(curop);
79072805
LW		 2123 linklist(o);
2124 return list(o);
2125}
2126
2127OP *
864dbfa3 2128Perl_convert(pTHX_ I32 type, I32 flags, OP *o)
79072805 2129{
27da23d5 2130 dVAR;
11343788
MB		 2131 if (!o || o->op_type != OP_LIST)
2132 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 2133 else
5dc0d613 2134 o->op_flags &= ~OPf_WANT;
79072805 2135
22c35a8c 2136 if (!(PL_opargs[type] & OA_MARK))
93c66552 2137 op_null(cLISTOPo->op_first);
8990e307 2138
eb160463 2139 o->op_type = (OPCODE)type;
22c35a8c 2140 o->op_ppaddr = PL_ppaddr[type];
11343788 2141 o->op_flags |= flags;
79072805 2142
11343788 2143 o = CHECKOP(type, o);
fe2774ed 2144 if (o->op_type != (unsigned)type)
11343788 2145 return o;
79072805 2146
11343788 2147 return fold_constants(o);
79072805
LW		 2148}
2149
2150/* List constructors */
2151
2152OP *
864dbfa3 2153Perl_append_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2154{
2155 if (!first)
2156 return last;
8990e307
LW		 2157
2158 if (!last)
79072805 2159 return first;
8990e307 2160
fe2774ed 2161 if (first->op_type != (unsigned)type
155aba94
GS		 2162 || (type == OP_LIST && (first->op_flags & OPf_PARENS)))
2163 {
2164 return newLISTOP(type, 0, first, last);
2165 }
79072805 2166
a0d0e21e
LW		 2167 if (first->op_flags & OPf_KIDS)
2168 ((LISTOP*)first)->op_last->op_sibling = last;
2169 else {
2170 first->op_flags |= OPf_KIDS;
2171 ((LISTOP*)first)->op_first = last;
2172 }
2173 ((LISTOP*)first)->op_last = last;
a0d0e21e 2174 return first;
79072805
LW		 2175}
2176
2177OP *
864dbfa3 2178Perl_append_list(pTHX_ I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 2179{
2180 if (!first)
2181 return (OP*)last;
8990e307
LW		 2182
2183 if (!last)
79072805 2184 return (OP*)first;
8990e307 2185
fe2774ed 2186 if (first->op_type != (unsigned)type)
79072805 2187 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307 2188
fe2774ed 2189 if (last->op_type != (unsigned)type)
79072805
LW		 2190 return append_elem(type, (OP*)first, (OP*)last);
2191
2192 first->op_last->op_sibling = last->op_first;
2193 first->op_last = last->op_last;
117dada2 2194 first->op_flags |= (last->op_flags & OPf_KIDS);
1c846c1f 2195
238a4c30
NIS		 2196 FreeOp(last);
2197
79072805
LW		 2198 return (OP*)first;
2199}
2200
2201OP *
864dbfa3 2202Perl_prepend_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2203{
2204 if (!first)
2205 return last;
8990e307
LW		 2206
2207 if (!last)
79072805 2208 return first;
8990e307 2209
fe2774ed 2210 if (last->op_type == (unsigned)type) {
8990e307
LW		 2211 if (type == OP_LIST) { /* already a PUSHMARK there */
2212 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
2213 ((LISTOP*)last)->op_first->op_sibling = first;
36a5d4ba
DC		 2214 if (!(first->op_flags & OPf_PARENS))
2215 last->op_flags &= ~OPf_PARENS;
8990e307
LW		 2216 }
2217 else {
2218 if (!(last->op_flags & OPf_KIDS)) {
2219 ((LISTOP*)last)->op_last = first;
2220 last->op_flags |= OPf_KIDS;
2221 }
2222 first->op_sibling = ((LISTOP*)last)->op_first;
2223 ((LISTOP*)last)->op_first = first;
79072805 2224 }
117dada2 2225 last->op_flags |= OPf_KIDS;
79072805
LW		 2226 return last;
2227 }
2228
2229 return newLISTOP(type, 0, first, last);
2230}
2231
2232/* Constructors */
2233
2234OP *
864dbfa3 2235Perl_newNULLLIST(pTHX)
79072805 2236{
8990e307
LW		 2237 return newOP(OP_STUB, 0);
2238}
2239
2240OP *
864dbfa3 2241Perl_force_list(pTHX_ OP *o)
8990e307 2242{
11343788
MB		 2243 if (!o || o->op_type != OP_LIST)
2244 o = newLISTOP(OP_LIST, 0, o, Nullop);
93c66552 2245 op_null(o);
11343788 2246 return o;
79072805
LW		 2247}
2248
2249OP *
864dbfa3 2250Perl_newLISTOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805 2251{
27da23d5 2252 dVAR;
79072805
LW		 2253 LISTOP *listop;
2254
b7dc083c 2255 NewOp(1101, listop, 1, LISTOP);
79072805 2256
eb160463 2257 listop->op_type = (OPCODE)type;
22c35a8c 2258 listop->op_ppaddr = PL_ppaddr[type];
117dada2
SM		 2259 if (first || last)
2260 flags |= OPf_KIDS;
eb160463 2261 listop->op_flags = (U8)flags;
79072805
LW		 2262
2263 if (!last && first)
2264 last = first;
2265 else if (!first && last)
2266 first = last;
8990e307
LW		 2267 else if (first)
2268 first->op_sibling = last;
79072805
LW		 2269 listop->op_first = first;
2270 listop->op_last = last;
8990e307
LW		 2271 if (type == OP_LIST) {
2272 OP* pushop;
2273 pushop = newOP(OP_PUSHMARK, 0);
2274 pushop->op_sibling = first;
2275 listop->op_first = pushop;
2276 listop->op_flags |= OPf_KIDS;
2277 if (!last)
2278 listop->op_last = pushop;
2279 }
79072805 2280
463d09e6 2281 return CHECKOP(type, listop);
79072805
LW		 2282}
2283
2284OP *
864dbfa3 2285Perl_newOP(pTHX_ I32 type, I32 flags)
79072805 2286{
27da23d5 2287 dVAR;
11343788 2288 OP *o;
b7dc083c 2289 NewOp(1101, o, 1, OP);
eb160463 2290 o->op_type = (OPCODE)type;
22c35a8c 2291 o->op_ppaddr = PL_ppaddr[type];
eb160463 2292 o->op_flags = (U8)flags;
79072805 2293
11343788 2294 o->op_next = o;
eb160463 2295 o->op_private = (U8)(0 | (flags >> 8));
22c35a8c 2296 if (PL_opargs[type] & OA_RETSCALAR)
11343788 2297 scalar(o);
22c35a8c 2298 if (PL_opargs[type] & OA_TARGET)
11343788
MB		 2299 o->op_targ = pad_alloc(type, SVs_PADTMP);
2300 return CHECKOP(type, o);
79072805
LW		 2301}
2302
2303OP *
864dbfa3 2304Perl_newUNOP(pTHX_ I32 type, I32 flags, OP *first)
79072805 2305{
27da23d5 2306 dVAR;
79072805
LW		 2307 UNOP *unop;
2308
93a17b20 2309 if (!first)
aeea060c 2310 first = newOP(OP_STUB, 0);
22c35a8c 2311 if (PL_opargs[type] & OA_MARK)
8990e307 2312 first = force_list(first);
93a17b20 2313
b7dc083c 2314 NewOp(1101, unop, 1, UNOP);
eb160463 2315 unop->op_type = (OPCODE)type;
22c35a8c 2316 unop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2317 unop->op_first = first;
2318 unop->op_flags = flags | OPf_KIDS;
eb160463 2319 unop->op_private = (U8)(1 | (flags >> 8));
e50aee73 2320 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 2321 if (unop->op_next)
2322 return (OP*)unop;
2323
a0d0e21e 2324 return fold_constants((OP *) unop);
79072805
LW		 2325}
2326
2327OP *
864dbfa3 2328Perl_newBINOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805 2329{
27da23d5 2330 dVAR;
79072805 2331 BINOP *binop;
b7dc083c 2332 NewOp(1101, binop, 1, BINOP);
79072805
LW		 2333
2334 if (!first)
2335 first = newOP(OP_NULL, 0);
2336
eb160463 2337 binop->op_type = (OPCODE)type;
22c35a8c 2338 binop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2339 binop->op_first = first;
2340 binop->op_flags = flags | OPf_KIDS;
2341 if (!last) {
2342 last = first;
eb160463 2343 binop->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 2344 }
2345 else {
eb160463 2346 binop->op_private = (U8)(2 | (flags >> 8));
79072805
LW		 2347 first->op_sibling = last;
2348 }
2349
e50aee73 2350 binop = (BINOP*)CHECKOP(type, binop);
eb160463 2351 if (binop->op_next || binop->op_type != (OPCODE)type)
79072805
LW		 2352 return (OP*)binop;
2353
7284ab6f 2354 binop->op_last = binop->op_first->op_sibling;
79072805 2355
a0d0e21e 2356 return fold_constants((OP *)binop);
79072805
LW		 2357}
2358
abb2c242
JH		 2359static int uvcompare(const void *a, const void *b) __attribute__nonnull__(1) __attribute__nonnull__(2) __attribute__pure__;
2360static int uvcompare(const void *a, const void *b)
2b9d42f0 2361{
e1ec3a88 2362 if (*((const UV *)a) < (*(const UV *)b))
2b9d42f0 2363 return -1;
e1ec3a88 2364 if (*((const UV *)a) > (*(const UV *)b))
2b9d42f0 2365 return 1;
e1ec3a88 2366 if (*((const UV *)a+1) < (*(const UV *)b+1))
2b9d42f0 2367 return -1;
e1ec3a88 2368 if (*((const UV *)a+1) > (*(const UV *)b+1))
2b9d42f0 2369 return 1;
a0ed51b3
LW		 2370 return 0;
2371}
2372
79072805 2373OP *
864dbfa3 2374Perl_pmtrans(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2375{
2d03de9c
AL		 2376 SV * const tstr = ((SVOP*)expr)->op_sv;
2377 SV * const rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 2378 STRLEN tlen;
2379 STRLEN rlen;
5c144d81
NC		 2380 const U8 *t = (U8*)SvPV_const(tstr, tlen);
2381 const U8 *r = (U8*)SvPV_const(rstr, rlen);
79072805
LW		 2382 register I32 i;
2383 register I32 j;
a0ed51b3 2384 I32 del;
79072805 2385 I32 complement;
5d06d08e 2386 I32 squash;
9b877dbb 2387 I32 grows = 0;
79072805
LW		 2388 register short *tbl;
2389
800b4dc4 2390 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2391 complement = o->op_private & OPpTRANS_COMPLEMENT;
a0ed51b3 2392 del = o->op_private & OPpTRANS_DELETE;
5d06d08e 2393 squash = o->op_private & OPpTRANS_SQUASH;
1c846c1f 2394
036b4402
GS		 2395 if (SvUTF8(tstr))
2396 o->op_private |= OPpTRANS_FROM_UTF;
1c846c1f
NIS		 2397
2398 if (SvUTF8(rstr))
036b4402 2399 o->op_private |= OPpTRANS_TO_UTF;
79072805 2400
a0ed51b3 2401 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
79cb57f6 2402 SV* listsv = newSVpvn("# comment\n",10);
a0ed51b3 2403 SV* transv = 0;
5c144d81
NC		 2404 const U8* tend = t + tlen;
2405 const U8* rend = r + rlen;
ba210ebe 2406 STRLEN ulen;
84c133a0
RB		 2407 UV tfirst = 1;
2408 UV tlast = 0;
2409 IV tdiff;
2410 UV rfirst = 1;
2411 UV rlast = 0;
2412 IV rdiff;
2413 IV diff;
a0ed51b3
LW		 2414 I32 none = 0;
2415 U32 max = 0;
2416 I32 bits;
a0ed51b3 2417 I32 havefinal = 0;
9c5ffd7c 2418 U32 final = 0;
a0ed51b3
LW		 2419 I32 from_utf = o->op_private & OPpTRANS_FROM_UTF;
2420 I32 to_utf = o->op_private & OPpTRANS_TO_UTF;
bf4a1e57
JH		 2421 U8* tsave = NULL;
2422 U8* rsave = NULL;
2423
2424 if (!from_utf) {
2425 STRLEN len = tlen;
5c144d81 2426 t = tsave = bytes_to_utf8(t, &len);
bf4a1e57
JH		 2427 tend = t + len;
2428 }
2429 if (!to_utf && rlen) {
2430 STRLEN len = rlen;
5c144d81 2431 r = rsave = bytes_to_utf8(r, &len);
bf4a1e57
JH		 2432 rend = r + len;
2433 }
a0ed51b3 2434
2b9d42f0
NIS		 2435/* There are several snags with this code on EBCDIC:
2436 1. 0xFF is a legal UTF-EBCDIC byte (there are no illegal bytes).
2437 2. scan_const() in toke.c has encoded chars in native encoding which makes
2438 ranges at least in EBCDIC 0..255 range the bottom odd.
2439*/
2440
a0ed51b3 2441 if (complement) {
89ebb4a3 2442 U8 tmpbuf[UTF8_MAXBYTES+1];
2b9d42f0 2443 UV *cp;
a0ed51b3 2444 UV nextmin = 0;
a02a5408 2445 Newx(cp, 2*tlen, UV);
a0ed51b3 2446 i = 0;
79cb57f6 2447 transv = newSVpvn("",0);
a0ed51b3 2448 while (t < tend) {
2b9d42f0
NIS		 2449 cp[2*i] = utf8n_to_uvuni(t, tend-t, &ulen, 0);
2450 t += ulen;
2451 if (t < tend && NATIVE_TO_UTF(*t) == 0xff) {
a0ed51b3 2452 t++;
2b9d42f0
NIS		 2453 cp[2*i+1] = utf8n_to_uvuni(t, tend-t, &ulen, 0);
2454 t += ulen;
a0ed51b3 2455 }
2b9d42f0
NIS		 2456 else {
2457 cp[2*i+1] = cp[2*i];
2458 }
2459 i++;
a0ed51b3 2460 }
2b9d42f0 2461 qsort(cp, i, 2*sizeof(UV), uvcompare);
a0ed51b3 2462 for (j = 0; j < i; j++) {
2b9d42f0 2463 UV val = cp[2*j];
a0ed51b3
LW		 2464 diff = val - nextmin;
2465 if (diff > 0) {
9041c2e3 2466 t = uvuni_to_utf8(tmpbuf,nextmin);
dfe13c55 2467 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3 2468 if (diff > 1) {
2b9d42f0 2469 U8 range_mark = UTF_TO_NATIVE(0xff);
9041c2e3 2470 t = uvuni_to_utf8(tmpbuf, val - 1);
2b9d42f0 2471 sv_catpvn(transv, (char *)&range_mark, 1);
dfe13c55 2472 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2473 }
2474 }
2b9d42f0 2475 val = cp[2*j+1];
a0ed51b3
LW		 2476 if (val >= nextmin)
2477 nextmin = val + 1;
2478 }
9041c2e3 2479 t = uvuni_to_utf8(tmpbuf,nextmin);
dfe13c55 2480 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
2b9d42f0
NIS		 2481 {
2482 U8 range_mark = UTF_TO_NATIVE(0xff);
2483 sv_catpvn(transv, (char *)&range_mark, 1);
2484 }
b851fbc1
JH		 2485 t = uvuni_to_utf8_flags(tmpbuf, 0x7fffffff,
2486 UNICODE_ALLOW_SUPER);
dfe13c55 2487 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
93524f2b 2488 t = (const U8*)SvPVX_const(transv);
a0ed51b3
LW		 2489 tlen = SvCUR(transv);
2490 tend = t + tlen;
455d824a 2491 Safefree(cp);
a0ed51b3
LW		 2492 }
2493 else if (!rlen && !del) {
2494 r = t; rlen = tlen; rend = tend;
4757a243
LW		 2495 }
2496 if (!squash) {
05d340b8 2497 if ((!rlen && !del) || t == r ||
12ae5dfc 2498 (tlen == rlen && memEQ((char *)t, (char *)r, tlen)))
01ec43d0 2499 {
4757a243 2500 o->op_private |= OPpTRANS_IDENTICAL;
01ec43d0 2501 }
a0ed51b3
LW		 2502 }
2503
2504 while (t < tend || tfirst <= tlast) {
2505 /* see if we need more "t" chars */
2506 if (tfirst > tlast) {
9041c2e3 2507 tfirst = (I32)utf8n_to_uvuni(t, tend - t, &ulen, 0);
a0ed51b3 2508 t += ulen;
2b9d42f0 2509 if (t < tend && NATIVE_TO_UTF(*t) == 0xff) { /* illegal utf8 val indicates range */
ba210ebe 2510 t++;
9041c2e3 2511 tlast = (I32)utf8n_to_uvuni(t, tend - t, &ulen, 0);
a0ed51b3
LW		 2512 t += ulen;
2513 }
2514 else
2515 tlast = tfirst;
2516 }
2517
2518 /* now see if we need more "r" chars */
2519 if (rfirst > rlast) {
2520 if (r < rend) {
9041c2e3 2521 rfirst = (I32)utf8n_to_uvuni(r, rend - r, &ulen, 0);
a0ed51b3 2522 r += ulen;
2b9d42f0 2523 if (r < rend && NATIVE_TO_UTF(*r) == 0xff) { /* illegal utf8 val indicates range */
ba210ebe 2524 r++;
9041c2e3 2525 rlast = (I32)utf8n_to_uvuni(r, rend - r, &ulen, 0);
a0ed51b3
LW		 2526 r += ulen;
2527 }
2528 else
2529 rlast = rfirst;
2530 }
2531 else {
2532 if (!havefinal++)
2533 final = rlast;
2534 rfirst = rlast = 0xffffffff;
2535 }
2536 }
2537
2538 /* now see which range will peter our first, if either. */
2539 tdiff = tlast - tfirst;
2540 rdiff = rlast - rfirst;
2541
2542 if (tdiff <= rdiff)
2543 diff = tdiff;
2544 else
2545 diff = rdiff;
2546
2547 if (rfirst == 0xffffffff) {
2548 diff = tdiff; /* oops, pretend rdiff is infinite */
2549 if (diff > 0)
894356b3
GS		 2550 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\tXXXX\n",
2551 (long)tfirst, (long)tlast);
a0ed51b3 2552 else
894356b3 2553 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\tXXXX\n", (long)tfirst);
a0ed51b3
LW		 2554 }
2555 else {
2556 if (diff > 0)
894356b3
GS		 2557 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\t%04lx\n",
2558 (long)tfirst, (long)(tfirst + diff),
2559 (long)rfirst);
a0ed51b3 2560 else
894356b3
GS		 2561 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\t%04lx\n",
2562 (long)tfirst, (long)rfirst);
a0ed51b3
LW		 2563
2564 if (rfirst + diff > max)
2565 max = rfirst + diff;
9b877dbb 2566 if (!grows)
45005bfb
JH		 2567 grows = (tfirst < rfirst &&
2568 UNISKIP(tfirst) < UNISKIP(rfirst + diff));
2569 rfirst += diff + 1;
a0ed51b3
LW		 2570 }
2571 tfirst += diff + 1;
2572 }
2573
2574 none = ++max;
2575 if (del)
2576 del = ++max;
2577
2578 if (max > 0xffff)
2579 bits = 32;
2580 else if (max > 0xff)
2581 bits = 16;
2582 else
2583 bits = 8;
2584
455d824a 2585 Safefree(cPVOPo->op_pv);
a0ed51b3
LW		 2586 cSVOPo->op_sv = (SV*)swash_init("utf8", "", listsv, bits, none);
2587 SvREFCNT_dec(listsv);
2588 if (transv)
2589 SvREFCNT_dec(transv);
2590
45005bfb 2591 if (!del && havefinal && rlen)
b448e4fe
JH		 2592 (void)hv_store((HV*)SvRV((cSVOPo->op_sv)), "FINAL", 5,
2593 newSVuv((UV)final), 0);
a0ed51b3 2594
9b877dbb 2595 if (grows)
a0ed51b3
LW		 2596 o->op_private |= OPpTRANS_GROWS;
2597
9b877dbb
IH		 2598 if (tsave)
2599 Safefree(tsave);
2600 if (rsave)
2601 Safefree(rsave);
2602
a0ed51b3
LW		 2603 op_free(expr);
2604 op_free(repl);
2605 return o;
2606 }
2607
2608 tbl = (short*)cPVOPo->op_pv;
79072805
LW		 2609 if (complement) {
2610 Zero(tbl, 256, short);
eb160463 2611 for (i = 0; i < (I32)tlen; i++)
ec49126f 2612 tbl[t[i]] = -1;
79072805
LW		 2613 for (i = 0, j = 0; i < 256; i++) {
2614 if (!tbl[i]) {
eb160463 2615 if (j >= (I32)rlen) {
a0ed51b3 2616 if (del)
79072805
LW		 2617 tbl[i] = -2;
2618 else if (rlen)
ec49126f 2619 tbl[i] = r[j-1];
79072805 2620 else
eb160463 2621 tbl[i] = (short)i;
79072805 2622 }
9b877dbb
IH		 2623 else {
2624 if (i < 128 && r[j] >= 128)
2625 grows = 1;
ec49126f 2626 tbl[i] = r[j++];
9b877dbb 2627 }
79072805
LW		 2628 }
2629 }
05d340b8
JH		 2630 if (!del) {
2631 if (!rlen) {
2632 j = rlen;
2633 if (!squash)
2634 o->op_private |= OPpTRANS_IDENTICAL;
2635 }
eb160463 2636 else if (j >= (I32)rlen)
05d340b8
JH		 2637 j = rlen - 1;
2638 else
2639 cPVOPo->op_pv = (char*)Renew(tbl, 0x101+rlen-j, short);
8973db79 2640 tbl[0x100] = rlen - j;
eb160463 2641 for (i=0; i < (I32)rlen - j; i++)
8973db79
JH		 2642 tbl[0x101+i] = r[j+i];
2643 }
79072805
LW		 2644 }
2645 else {
a0ed51b3 2646 if (!rlen && !del) {
79072805 2647 r = t; rlen = tlen;
5d06d08e 2648 if (!squash)
4757a243 2649 o->op_private |= OPpTRANS_IDENTICAL;
79072805 2650 }
94bfe852
RGS		 2651 else if (!squash && rlen == tlen && memEQ((char*)t, (char*)r, tlen)) {
2652 o->op_private |= OPpTRANS_IDENTICAL;
2653 }
79072805
LW		 2654 for (i = 0; i < 256; i++)
2655 tbl[i] = -1;
eb160463
GS		 2656 for (i = 0, j = 0; i < (I32)tlen; i++,j++) {
2657 if (j >= (I32)rlen) {
a0ed51b3 2658 if (del) {
ec49126f 2659 if (tbl[t[i]] == -1)
2660 tbl[t[i]] = -2;
79072805
LW		 2661 continue;
2662 }
2663 --j;
2664 }
9b877dbb
IH		 2665 if (tbl[t[i]] == -1) {
2666 if (t[i] < 128 && r[j] >= 128)
2667 grows = 1;
ec49126f 2668 tbl[t[i]] = r[j];
9b877dbb 2669 }
79072805
LW		 2670 }
2671 }
9b877dbb
IH		 2672 if (grows)
2673 o->op_private |= OPpTRANS_GROWS;
79072805
LW		 2674 op_free(expr);
2675 op_free(repl);
2676
11343788 2677 return o;
79072805
LW		 2678}
2679
2680OP *
864dbfa3 2681Perl_newPMOP(pTHX_ I32 type, I32 flags)
79072805 2682{
27da23d5 2683 dVAR;
79072805
LW		 2684 PMOP *pmop;
2685
b7dc083c 2686 NewOp(1101, pmop, 1, PMOP);
eb160463 2687 pmop->op_type = (OPCODE)type;
22c35a8c 2688 pmop->op_ppaddr = PL_ppaddr[type];
eb160463
GS		 2689 pmop->op_flags = (U8)flags;
2690 pmop->op_private = (U8)(0 | (flags >> 8));
79072805 2691
3280af22 2692 if (PL_hints & HINT_RE_TAINT)
b3eb6a9b 2693 pmop->op_pmpermflags |= PMf_RETAINT;
3280af22 2694 if (PL_hints & HINT_LOCALE)
b3eb6a9b
GS		 2695 pmop->op_pmpermflags |= PMf_LOCALE;
2696 pmop->op_pmflags = pmop->op_pmpermflags;
36477c24 2697
debc9467 2698#ifdef USE_ITHREADS
13137afc
AB		 2699 {
2700 SV* repointer;
2701 if(av_len((AV*) PL_regex_pad[0]) > -1) {
2702 repointer = av_pop((AV*)PL_regex_pad[0]);
2703 pmop->op_pmoffset = SvIV(repointer);
1cc8b4c5 2704 SvREPADTMP_off(repointer);
13137afc 2705 sv_setiv(repointer,0);
1eb1540c 2706 } else {
13137afc
AB		 2707 repointer = newSViv(0);
2708 av_push(PL_regex_padav,SvREFCNT_inc(repointer));
2709 pmop->op_pmoffset = av_len(PL_regex_padav);
2710 PL_regex_pad = AvARRAY(PL_regex_padav);
1fcf4c12 2711 }
13137afc 2712 }
debc9467 2713#endif
1eb1540c 2714
1fcf4c12 2715 /* link into pm list */
3280af22 2716 if (type != OP_TRANS && PL_curstash) {
8d2f4536
NC		 2717 MAGIC *mg = mg_find((SV*)PL_curstash, PERL_MAGIC_symtab);
2718
2719 if (!mg) {
2720 mg = sv_magicext((SV*)PL_curstash, 0, PERL_MAGIC_symtab, 0, 0, 0);
2721 }
2722 pmop->op_pmnext = (PMOP*)mg->mg_obj;
2723 mg->mg_obj = (SV*)pmop;
cb55de95 2724 PmopSTASH_set(pmop,PL_curstash);
79072805
LW		 2725 }
2726
463d09e6 2727 return CHECKOP(type, pmop);
79072805
LW		 2728}
2729
131b3ad0
DM		 2730/* Given some sort of match op o, and an expression expr containing a
2731 * pattern, either compile expr into a regex and attach it to o (if it's
2732 * constant), or convert expr into a runtime regcomp op sequence (if it's
2733 * not)
2734 *
2735 * isreg indicates that the pattern is part of a regex construct, eg
2736 * $x =~ /pattern/ or split /pattern/, as opposed to $x =~ $pattern or
2737 * split "pattern", which aren't. In the former case, expr will be a list
2738 * if the pattern contains more than one term (eg /a$b/) or if it contains
2739 * a replacement, ie s/// or tr///.
2740 */
2741
79072805 2742OP *
131b3ad0 2743Perl_pmruntime(pTHX_ OP *o, OP *expr, bool isreg)
79072805 2744{
27da23d5 2745 dVAR;
79072805
LW		 2746 PMOP *pm;
2747 LOGOP *rcop;
ce862d02 2748 I32 repl_has_vars = 0;
131b3ad0
DM		 2749 OP* repl = Nullop;
2750 bool reglist;
2751
2752 if (o->op_type == OP_SUBST || o->op_type == OP_TRANS) {
2753 /* last element in list is the replacement; pop it */
2754 OP* kid;
2755 repl = cLISTOPx(expr)->op_last;
2756 kid = cLISTOPx(expr)->op_first;
2757 while (kid->op_sibling != repl)
2758 kid = kid->op_sibling;
2759 kid->op_sibling = Nullop;
2760 cLISTOPx(expr)->op_last = kid;
2761 }
79072805 2762
131b3ad0
DM		 2763 if (isreg && expr->op_type == OP_LIST &&
2764 cLISTOPx(expr)->op_first->op_sibling == cLISTOPx(expr)->op_last)
2765 {
2766 /* convert single element list to element */
2767 OP* oe = expr;
2768 expr = cLISTOPx(oe)->op_first->op_sibling;
2769 cLISTOPx(oe)->op_first->op_sibling = Nullop;
2770 cLISTOPx(oe)->op_last = Nullop;
2771 op_free(oe);
2772 }
2773
2774 if (o->op_type == OP_TRANS) {
11343788 2775 return pmtrans(o, expr, repl);
131b3ad0
DM		 2776 }
2777
2778 reglist = isreg && expr->op_type == OP_LIST;
2779 if (reglist)
2780 op_null(expr);
79072805 2781
3280af22 2782 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2783 pm = (PMOP*)o;
79072805
LW		 2784
2785 if (expr->op_type == OP_CONST) {
463ee0b2 2786 STRLEN plen;
79072805 2787 SV *pat = ((SVOP*)expr)->op_sv;
5c144d81 2788 const char *p = SvPV_const(pat, plen);
770526c1 2789 if ((o->op_flags & OPf_SPECIAL) && (*p == ' ' && p[1] == '\0')) {
5c144d81
NC		 2790 U32 was_readonly = SvREADONLY(pat);
2791
2792 if (was_readonly) {
2793 if (SvFAKE(pat)) {
2794 sv_force_normal_flags(pat, 0);
2795 assert(!SvREADONLY(pat));
2796 was_readonly = 0;
2797 } else {
2798 SvREADONLY_off(pat);
2799 }
2800 }
2801
93a17b20 2802 sv_setpvn(pat, "\\s+", 3);
5c144d81
NC		 2803
2804 SvFLAGS(pat) |= was_readonly;
2805
2806 p = SvPV_const(pat, plen);
79072805
LW		 2807 pm->op_pmflags |= PMf_SKIPWHITE;
2808 }
5b71a6a7 2809 if (DO_UTF8(pat))
a5961de5 2810 pm->op_pmdynflags |= PMdf_UTF8;
5c144d81
NC		 2811 /* FIXME - can we make this function take const char * args? */
2812 PM_SETRE(pm, CALLREGCOMP(aTHX_ (char*)p, (char*)p + plen, pm));
aaa362c4 2813 if (strEQ("\\s+", PM_GETRE(pm)->precomp))
85e6fe83 2814 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2815 op_free(expr);
2816 }
2817 else {
3280af22 2818 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL))
1c846c1f 2819 expr = newUNOP((!(PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2820 ? OP_REGCRESET
2821 : OP_REGCMAYBE),0,expr);
463ee0b2 2822
b7dc083c 2823 NewOp(1101, rcop, 1, LOGOP);
79072805 2824 rcop->op_type = OP_REGCOMP;
22c35a8c 2825 rcop->op_ppaddr = PL_ppaddr[OP_REGCOMP];
79072805 2826 rcop->op_first = scalar(expr);
131b3ad0
DM		 2827 rcop->op_flags |= OPf_KIDS
2828 | ((PL_hints & HINT_RE_EVAL) ? OPf_SPECIAL : 0)
2829 | (reglist ? OPf_STACKED : 0);
79072805 2830 rcop->op_private = 1;
11343788 2831 rcop->op_other = o;
131b3ad0
DM		 2832 if (reglist)
2833 rcop->op_targ = pad_alloc(rcop->op_type, SVs_PADTMP);
2834
b5c19bd7
DM		 2835 /* /$x/ may cause an eval, since $x might be qr/(?{..})/ */
2836 PL_cv_has_eval = 1;
79072805
LW		 2837
2838 /* establish postfix order */
3280af22 2839 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL)) {
463ee0b2
LW		 2840 LINKLIST(expr);
2841 rcop->op_next = expr;
2842 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2843 }
2844 else {
2845 rcop->op_next = LINKLIST(expr);
2846 expr->op_next = (OP*)rcop;
2847 }
79072805 2848
11343788 2849 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2850 }
2851
2852 if (repl) {
748a9306 2853 OP *curop;
0244c3a4 2854 if (pm->op_pmflags & PMf_EVAL) {
748a9306 2855 curop = 0;
8bafa735 2856 if (CopLINE(PL_curcop) < (line_t)PL_multi_end)
eb160463 2857 CopLINE_set(PL_curcop, (line_t)PL_multi_end);
0244c3a4 2858 }
748a9306
LW		 2859 else if (repl->op_type == OP_CONST)
2860 curop = repl;
79072805 2861 else {
79072805
LW		 2862 OP *lastop = 0;
2863 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
22c35a8c 2864 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805 2865 if (curop->op_type == OP_GV) {
638eceb6 2866 GV *gv = cGVOPx_gv(curop);
ce862d02 2867 repl_has_vars = 1;
f702bf4a 2868 if (strchr("&`'123456789+-\016\022", *GvENAME(gv)))
79072805
LW		 2869 break;
2870 }
2871 else if (curop->op_type == OP_RV2CV)
2872 break;
2873 else if (curop->op_type == OP_RV2SV ||
2874 curop->op_type == OP_RV2AV ||
2875 curop->op_type == OP_RV2HV ||
2876 curop->op_type == OP_RV2GV) {
2877 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2878 break;
2879 }
748a9306
LW		 2880 else if (curop->op_type == OP_PADSV ||
2881 curop->op_type == OP_PADAV ||
2882 curop->op_type == OP_PADHV ||
554b3eca 2883 curop->op_type == OP_PADANY) {
ce862d02 2884 repl_has_vars = 1;
748a9306 2885 }
1167e5da
SM		 2886 else if (curop->op_type == OP_PUSHRE)
2887 ; /* Okay here, dangerous in newASSIGNOP */
79072805
LW		 2888 else
2889 break;
2890 }
2891 lastop = curop;
2892 }
748a9306 2893 }
ce862d02 2894 if (curop == repl
1c846c1f 2895 && !(repl_has_vars
aaa362c4
RS		 2896 && (!PM_GETRE(pm)
2897 || PM_GETRE(pm)->reganch & ROPT_EVAL_SEEN))) {
748a9306 2898 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2899 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2900 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2901 }
2902 else {
aaa362c4 2903 if (curop == repl && !PM_GETRE(pm)) { /* Has variables. */
ce862d02
IZ		 2904 pm->op_pmflags |= PMf_MAYBE_CONST;
2905 pm->op_pmpermflags |= PMf_MAYBE_CONST;
2906 }
b7dc083c 2907 NewOp(1101, rcop, 1, LOGOP);
748a9306 2908 rcop->op_type = OP_SUBSTCONT;
22c35a8c 2909 rcop->op_ppaddr = PL_ppaddr[OP_SUBSTCONT];
748a9306
LW		 2910 rcop->op_first = scalar(repl);
2911 rcop->op_flags |= OPf_KIDS;
2912 rcop->op_private = 1;
11343788 2913 rcop->op_other = o;
748a9306
LW		 2914
2915 /* establish postfix order */
2916 rcop->op_next = LINKLIST(repl);
2917 repl->op_next = (OP*)rcop;
2918
2919 pm->op_pmreplroot = scalar((OP*)rcop);
2920 pm->op_pmreplstart = LINKLIST(rcop);
2921 rcop->op_next = 0;
79072805
LW		 2922 }
2923 }
2924
2925 return (OP*)pm;
2926}
2927
2928OP *
864dbfa3 2929Perl_newSVOP(pTHX_ I32 type, I32 flags, SV *sv)
79072805 2930{
27da23d5 2931 dVAR;
79072805 2932 SVOP *svop;
b7dc083c 2933 NewOp(1101, svop, 1, SVOP);
eb160463 2934 svop->op_type = (OPCODE)type;
22c35a8c 2935 svop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2936 svop->op_sv = sv;
2937 svop->op_next = (OP*)svop;
eb160463 2938 svop->op_flags = (U8)flags;
22c35a8c 2939 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2940 scalar((OP*)svop);
22c35a8c 2941 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2942 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2943 return CHECKOP(type, svop);
79072805
LW		 2944}
2945
2946OP *
350de78d
GS		 2947Perl_newPADOP(pTHX_ I32 type, I32 flags, SV *sv)
2948{
27da23d5 2949 dVAR;
350de78d
GS		 2950 PADOP *padop;
2951 NewOp(1101, padop, 1, PADOP);
eb160463 2952 padop->op_type = (OPCODE)type;
350de78d
GS		 2953 padop->op_ppaddr = PL_ppaddr[type];
2954 padop->op_padix = pad_alloc(type, SVs_PADTMP);
dd2155a4
DM		 2955 SvREFCNT_dec(PAD_SVl(padop->op_padix));
2956 PAD_SETSV(padop->op_padix, sv);
ce50c033
AMS		 2957 if (sv)
2958 SvPADTMP_on(sv);
350de78d 2959 padop->op_next = (OP*)padop;
eb160463 2960 padop->op_flags = (U8)flags;
350de78d
GS		 2961 if (PL_opargs[type] & OA_RETSCALAR)
2962 scalar((OP*)padop);
2963 if (PL_opargs[type] & OA_TARGET)
2964 padop->op_targ = pad_alloc(type, SVs_PADTMP);
2965 return CHECKOP(type, padop);
2966}
2967
2968OP *
864dbfa3 2969Perl_newGVOP(pTHX_ I32 type, I32 flags, GV *gv)
79072805 2970{
27da23d5 2971 dVAR;
350de78d 2972#ifdef USE_ITHREADS
ce50c033
AMS		 2973 if (gv)
2974 GvIN_PAD_on(gv);
350de78d
GS		 2975 return newPADOP(type, flags, SvREFCNT_inc(gv));
2976#else
7934575e 2977 return newSVOP(type, flags, SvREFCNT_inc(gv));
350de78d 2978#endif
79072805
LW		 2979}
2980
2981OP *
864dbfa3 2982Perl_newPVOP(pTHX_ I32 type, I32 flags, char *pv)
79072805 2983{
27da23d5 2984 dVAR;
79072805 2985 PVOP *pvop;
b7dc083c 2986 NewOp(1101, pvop, 1, PVOP);
eb160463 2987 pvop->op_type = (OPCODE)type;
22c35a8c 2988 pvop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2989 pvop->op_pv = pv;
2990 pvop->op_next = (OP*)pvop;
eb160463 2991 pvop->op_flags = (U8)flags;
22c35a8c 2992 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2993 scalar((OP*)pvop);
22c35a8c 2994 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2995 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2996 return CHECKOP(type, pvop);
79072805
LW		 2997}
2998
79072805 2999void
864dbfa3 3000Perl_package(pTHX_ OP *o)
79072805 3001{
6867be6d 3002 const char *name;
de11ba31 3003 STRLEN len;
79072805 3004
3280af22
NIS		 3005 save_hptr(&PL_curstash);
3006 save_item(PL_curstname);
de11ba31 3007
5c144d81 3008 name = SvPV_const(cSVOPo->op_sv, len);
de11ba31
AMS		 3009 PL_curstash = gv_stashpvn(name, len, TRUE);
3010 sv_setpvn(PL_curstname, name, len);
3011 op_free(o);
3012
7ad382f4 3013 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 3014 PL_copline = NOLINE;
3015 PL_expect = XSTATE;
79072805
LW		 3016}
3017
85e6fe83 3018void
88d95a4d 3019Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *idop, OP *arg)
85e6fe83 3020{
a0d0e21e 3021 OP *pack;
a0d0e21e 3022 OP *imop;
b1cb66bf 3023 OP *veop;
85e6fe83 3024
88d95a4d 3025 if (idop->op_type != OP_CONST)
cea2e8a9 3026 Perl_croak(aTHX_ "Module name must be constant");
85e6fe83 3027
b1cb66bf 3028 veop = Nullop;
3029
aec46f14 3030 if (version) {
b1cb66bf 3031 SV *vesv = ((SVOP*)version)->op_sv;
3032
aec46f14 3033 if (!arg && !SvNIOKp(vesv)) {
b1cb66bf 3034 arg = version;
3035 }
3036 else {
3037 OP *pack;
0f79a09d 3038 SV *meth;
b1cb66bf 3039
44dcb63b 3040 if (version->op_type != OP_CONST || !SvNIOKp(vesv))
cea2e8a9 3041 Perl_croak(aTHX_ "Version number must be constant number");
b1cb66bf 3042
88d95a4d
JH		 3043 /* Make copy of idop so we don't free it twice */
3044 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv));
b1cb66bf 3045
3046 /* Fake up a method call to VERSION */
427d62a4 3047 meth = newSVpvn_share("VERSION", 7, 0);
b1cb66bf 3048 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
3049 append_elem(OP_LIST,
0f79a09d
GS		 3050 prepend_elem(OP_LIST, pack, list(version)),
3051 newSVOP(OP_METHOD_NAMED, 0, meth)));
b1cb66bf 3052 }
3053 }
aeea060c 3054
a0d0e21e 3055 /* Fake up an import/unimport */
4633a7c4
LW		 3056 if (arg && arg->op_type == OP_STUB)
3057 imop = arg; /* no import on explicit () */
88d95a4d 3058 else if (SvNIOKp(((SVOP*)idop)->op_sv)) {
b1cb66bf 3059 imop = Nullop; /* use 5.0; */
3060 }
4633a7c4 3061 else {
0f79a09d
GS		 3062 SV *meth;
3063
88d95a4d
JH		 3064 /* Make copy of idop so we don't free it twice */
3065 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv));
0f79a09d
GS		 3066
3067 /* Fake up a method call to import/unimport */
427d62a4
NC		 3068 meth = aver
3069 ? newSVpvn_share("import",6, 0) : newSVpvn_share("unimport", 8, 0);
4633a7c4 3070 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
0f79a09d
GS		 3071 append_elem(OP_LIST,
3072 prepend_elem(OP_LIST, pack, list(arg)),
3073 newSVOP(OP_METHOD_NAMED, 0, meth)));
4633a7c4
LW		 3074 }
3075
a0d0e21e 3076 /* Fake up the BEGIN {}, which does its thing immediately. */
09bef843 3077 newATTRSUB(floor,
427d62a4 3078 newSVOP(OP_CONST, 0, newSVpvn_share("BEGIN", 5, 0)),
4633a7c4 3079 Nullop,
09bef843 3080 Nullop,
a0d0e21e 3081 append_elem(OP_LINESEQ,
b1cb66bf 3082 append_elem(OP_LINESEQ,
88d95a4d 3083 newSTATEOP(0, Nullch, newUNOP(OP_REQUIRE, 0, idop)),
b1cb66bf 3084 newSTATEOP(0, Nullch, veop)),
a0d0e21e 3085 newSTATEOP(0, Nullch, imop) ));
85e6fe83 3086
70f5e4ed
JH		 3087 /* The "did you use incorrect case?" warning used to be here.
3088 * The problem is that on case-insensitive filesystems one
3089 * might get false positives for "use" (and "require"):
3090 * "use Strict" or "require CARP" will work. This causes
3091 * portability problems for the script: in case-strict
3092 * filesystems the script will stop working.
3093 *
3094 * The "incorrect case" warning checked whether "use Foo"
3095 * imported "Foo" to your namespace, but that is wrong, too:
3096 * there is no requirement nor promise in the language that
3097 * a Foo.pm should or would contain anything in package "Foo".
3098 *
3099 * There is very little Configure-wise that can be done, either:
3100 * the case-sensitivity of the build filesystem of Perl does not
3101 * help in guessing the case-sensitivity of the runtime environment.
3102 */
18fc9488 3103
c305c6a0 3104 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 3105 PL_copline = NOLINE;
3106 PL_expect = XSTATE;
8ec8fbef 3107 PL_cop_seqmax++; /* Purely for B::*'s benefit */
85e6fe83
LW		 3108}
3109
7d3fb230 3110/*
ccfc67b7
JH		 3111=head1 Embedding Functions
3112
7d3fb230
BS		 3113=for apidoc load_module
3114
3115Loads the module whose name is pointed to by the string part of name.
3116Note that the actual module name, not its filename, should be given.
3117Eg, "Foo::Bar" instead of "Foo/Bar.pm". flags can be any of
3118PERL_LOADMOD_DENY, PERL_LOADMOD_NOIMPORT, or PERL_LOADMOD_IMPORT_OPS
3119(or 0 for no flags). ver, if specified, provides version semantics
3120similar to C<use Foo::Bar VERSION>. The optional trailing SV*
3121arguments can be used to specify arguments to the module's import()
3122method, similar to C<use Foo::Bar VERSION LIST>.
3123
3124=cut */
3125
e4783991
GS		 3126void
3127Perl_load_module(pTHX_ U32 flags, SV *name, SV *ver, ...)
3128{
3129 va_list args;
3130 va_start(args, ver);
3131 vload_module(flags, name, ver, &args);
3132 va_end(args);
3133}
3134
3135#ifdef PERL_IMPLICIT_CONTEXT
3136void
3137Perl_load_module_nocontext(U32 flags, SV *name, SV *ver, ...)
3138{
3139 dTHX;
3140 va_list args;
3141 va_start(args, ver);
3142 vload_module(flags, name, ver, &args);
3143 va_end(args);
3144}
3145#endif
3146
3147void
3148Perl_vload_module(pTHX_ U32 flags, SV *name, SV *ver, va_list *args)
3149{
3150 OP *modname, *veop, *imop;
3151
3152 modname = newSVOP(OP_CONST, 0, name);
3153 modname->op_private |= OPpCONST_BARE;
3154 if (ver) {
3155 veop = newSVOP(OP_CONST, 0, ver);
3156 }
3157 else
3158 veop = Nullop;
3159 if (flags & PERL_LOADMOD_NOIMPORT) {
3160 imop = sawparens(newNULLLIST());
3161 }
3162 else if (flags & PERL_LOADMOD_IMPORT_OPS) {
3163 imop = va_arg(*args, OP*);
3164 }
3165 else {
3166 SV *sv;
3167 imop = Nullop;
3168 sv = va_arg(*args, SV*);
3169 while (sv) {
3170 imop = append_elem(OP_LIST, imop, newSVOP(OP_CONST, 0, sv));
3171 sv = va_arg(*args, SV*);
3172 }
3173 }
81885997 3174 {
6867be6d
AL		 3175 const line_t ocopline = PL_copline;
3176 COP * const ocurcop = PL_curcop;
3177 const int oexpect = PL_expect;
81885997
GS		 3178
3179 utilize(!(flags & PERL_LOADMOD_DENY), start_subparse(FALSE, 0),
3180 veop, modname, imop);
3181 PL_expect = oexpect;
3182 PL_copline = ocopline;
834a3ffa 3183 PL_curcop = ocurcop;
81885997 3184 }
e4783991
GS		 3185}
3186
79072805 3187OP *
864dbfa3 3188Perl_dofile(pTHX_ OP *term)
78ca652e
GS		 3189{
3190 OP *doop;
3191 GV *gv;
3192
3193 gv = gv_fetchpv("do", FALSE, SVt_PVCV);
b9f751c0 3194 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv)))
78ca652e
GS		 3195 gv = gv_fetchpv("CORE::GLOBAL::do", FALSE, SVt_PVCV);
3196
b9f751c0 3197 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
78ca652e
GS		 3198 doop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
3199 append_elem(OP_LIST, term,
3200 scalar(newUNOP(OP_RV2CV, 0,
3201 newGVOP(OP_GV, 0,
3202 gv))))));
3203 }
3204 else {
3205 doop = newUNOP(OP_DOFILE, 0, scalar(term));
3206 }
3207 return doop;
3208}
3209
3210OP *
864dbfa3 3211Perl_newSLICEOP(pTHX_ I32 flags, OP *subscript, OP *listval)
79072805
LW		 3212{
3213 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 3214 list(force_list(subscript)),
3215 list(force_list(listval)) );
79072805
LW		 3216}
3217
76e3520e 3218STATIC I32
504618e9 3219S_is_list_assignment(pTHX_ register const OP *o)
79072805 3220{
11343788 3221 if (!o)
79072805
LW		 3222 return TRUE;
3223
11343788
MB		 3224 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
3225 o = cUNOPo->op_first;
79072805 3226
11343788 3227 if (o->op_type == OP_COND_EXPR) {
504618e9
AL		 3228 const I32 t = is_list_assignment(cLOGOPo->op_first->op_sibling);
3229 const I32 f = is_list_assignment(cLOGOPo->op_first->op_sibling->op_sibling);
79072805
LW		 3230
3231 if (t && f)
3232 return TRUE;
3233 if (t || f)
3234 yyerror("Assignment to both a list and a scalar");
3235 return FALSE;
3236 }
3237
95f0a2f1
SB		 3238 if (o->op_type == OP_LIST &&
3239 (o->op_flags & OPf_WANT) == OPf_WANT_SCALAR &&
3240 o->op_private & OPpLVAL_INTRO)
3241 return FALSE;
3242
11343788
MB		 3243 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
3244 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
3245 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 3246 return TRUE;
3247
11343788 3248 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 3249 return TRUE;
3250
11343788 3251 if (o->op_type == OP_RV2SV)
79072805
LW		 3252 return FALSE;
3253
3254 return FALSE;
3255}
3256
3257OP *
864dbfa3 3258Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
79072805 3259{
11343788 3260 OP *o;
79072805 3261
a0d0e21e 3262 if (optype) {
c963b151 3263 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN || optype == OP_DORASSIGN) {
a0d0e21e
LW		 3264 return newLOGOP(optype, 0,
3265 mod(scalar(left), optype),
3266 newUNOP(OP_SASSIGN, 0, scalar(right)));
3267 }
3268 else {
3269 return newBINOP(optype, OPf_STACKED,
3270 mod(scalar(left), optype), scalar(right));
3271 }
3272 }
3273
504618e9 3274 if (is_list_assignment(left)) {
10c8fecd
GS		 3275 OP *curop;
3276
3280af22 3277 PL_modcount = 0;
dbfe47cf
RD		 3278 /* Grandfathering $[ assignment here. Bletch.*/
3279 /* Only simple assignments like C<< ($[) = 1 >> are allowed */
3280 PL_eval_start = (left->op_type == OP_CONST) ? right : 0;
463ee0b2 3281 left = mod(left, OP_AASSIGN);
3280af22
NIS		 3282 if (PL_eval_start)
3283 PL_eval_start = 0;
dbfe47cf
RD		 3284 else if (left->op_type == OP_CONST) {
3285 /* Result of assignment is always 1 (or we'd be dead already) */
3286 return newSVOP(OP_CONST, 0, newSViv(1));
a0d0e21e 3287 }
b9d46b39
RGS		 3288 /* optimise C<my @x = ()> to C<my @x>, and likewise for hashes */
3289 if ((left->op_type == OP_PADAV || left->op_type == OP_PADHV)
3290 && right->op_type == OP_STUB
3291 && (left->op_private & OPpLVAL_INTRO))
3292 {
3293 op_free(right);
9ff53bc9 3294 left->op_flags &= ~(OPf_REF|OPf_SPECIAL);
b9d46b39
RGS		 3295 return left;
3296 }
10c8fecd
GS		 3297 curop = list(force_list(left));
3298 o = newBINOP(OP_AASSIGN, flags, list(force_list(right)), curop);
eb160463 3299 o->op_private = (U8)(0 | (flags >> 8));
dd2155a4
DM		 3300
3301 /* PL_generation sorcery:
3302 * an assignment like ($a,$b) = ($c,$d) is easier than
3303 * ($a,$b) = ($c,$a), since there is no need for temporary vars.
3304 * To detect whether there are common vars, the global var
3305 * PL_generation is incremented for each assign op we compile.
3306 * Then, while compiling the assign op, we run through all the
3307 * variables on both sides of the assignment, setting a spare slot
3308 * in each of them to PL_generation. If any of them already have
3309 * that value, we know we've got commonality. We could use a
3310 * single bit marker, but then we'd have to make 2 passes, first
3311 * to clear the flag, then to test and set it. To find somewhere
3312 * to store these values, evil chicanery is done with SvCUR().
3313 */
3314
a0d0e21e 3315 if (!(left->op_private & OPpLVAL_INTRO)) {
11343788 3316 OP *lastop = o;
3280af22 3317 PL_generation++;
11343788 3318 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
22c35a8c 3319 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805 3320 if (curop->op_type == OP_GV) {
638eceb6 3321 GV *gv = cGVOPx_gv(curop);
eb160463 3322 if (gv == PL_defgv || (int)SvCUR(gv) == PL_generation)
79072805 3323 break;
b162af07 3324 SvCUR_set(gv, PL_generation);
79072805 3325 }
748a9306
LW		 3326 else if (curop->op_type == OP_PADSV ||
3327 curop->op_type == OP_PADAV ||
3328 curop->op_type == OP_PADHV ||
dd2155a4
DM		 3329 curop->op_type == OP_PADANY)
3330 {
3331 if (PAD_COMPNAME_GEN(curop->op_targ)
92251a1e 3332 == (STRLEN)PL_generation)
748a9306 3333 break;
b162af07 3334 PAD_COMPNAME_GEN_set(curop->op_targ, PL_generation);
dd2155a4 3335
748a9306 3336 }
79072805
LW		 3337 else if (curop->op_type == OP_RV2CV)
3338 break;
3339 else if (curop->op_type == OP_RV2SV ||
3340 curop->op_type == OP_RV2AV ||
3341 curop->op_type == OP_RV2HV ||
3342 curop->op_type == OP_RV2GV) {
3343 if (lastop->op_type != OP_GV) /* funny deref? */
3344 break;
3345 }
1167e5da
SM		 3346 else if (curop->op_type == OP_PUSHRE) {
3347 if (((PMOP*)curop)->op_pmreplroot) {
b3f5893f 3348#ifdef USE_ITHREADS
dd2155a4
DM		 3349 GV *gv = (GV*)PAD_SVl(INT2PTR(PADOFFSET,
3350 ((PMOP*)curop)->op_pmreplroot));
b3f5893f 3351#else
1167e5da 3352 GV *gv = (GV*)((PMOP*)curop)->op_pmreplroot;
b3f5893f 3353#endif
eb160463 3354 if (gv == PL_defgv || (int)SvCUR(gv) == PL_generation)
1167e5da 3355 break;
b162af07 3356 SvCUR_set(gv, PL_generation);
b2ffa427 3357 }
1167e5da 3358 }
79072805
LW		 3359 else
3360 break;
3361 }
3362 lastop = curop;
3363 }
11343788 3364 if (curop != o)
10c8fecd 3365 o->op_private |= OPpASSIGN_COMMON;
79072805 3366 }
c07a80fd 3367 if (right && right->op_type == OP_SPLIT) {
3368 OP* tmpop;
3369 if ((tmpop = ((LISTOP*)right)->op_first) &&
3370 tmpop->op_type == OP_PUSHRE)
3371 {
3372 PMOP *pm = (PMOP*)tmpop;
3373 if (left->op_type == OP_RV2AV &&
3374 !(left->op_private & OPpLVAL_INTRO) &&
11343788 3375 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 3376 {
3377 tmpop = ((UNOP*)left)->op_first;
3378 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
971a9dd3 3379#ifdef USE_ITHREADS
ba89bb6e 3380 pm->op_pmreplroot = INT2PTR(OP*, cPADOPx(tmpop)->op_padix);
971a9dd3
GS		 3381 cPADOPx(tmpop)->op_padix = 0; /* steal it */
3382#else
3383 pm->op_pmreplroot = (OP*)cSVOPx(tmpop)->op_sv;
3384 cSVOPx(tmpop)->op_sv = Nullsv; /* steal it */
3385#endif
c07a80fd 3386 pm->op_pmflags |= PMf_ONCE;
11343788 3387 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 3388 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
3389 tmpop->op_sibling = Nullop; /* don't free split */
3390 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 3391 op_free(o); /* blow off assign */
54310121 3392 right->op_flags &= ~OPf_WANT;
a5f75d66 3393 /* "I don't know and I don't care." */
c07a80fd 3394 return right;
3395 }
3396 }
3397 else {
e6438c1a 3398 if (PL_modcount < RETURN_UNLIMITED_NUMBER &&
c07a80fd 3399 ((LISTOP*)right)->op_last->op_type == OP_CONST)
3400 {
3401 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
3402 if (SvIVX(sv) == 0)
3280af22 3403 sv_setiv(sv, PL_modcount+1);
c07a80fd 3404 }
3405 }
3406 }
3407 }
11343788 3408 return o;
79072805
LW		 3409 }
3410 if (!right)
3411 right = newOP(OP_UNDEF, 0);
3412 if (right->op_type == OP_READLINE) {
3413 right->op_flags |= OPf_STACKED;
463ee0b2 3414 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 3415 }
a0d0e21e 3416 else {
3280af22 3417 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 3418 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 3419 scalar(right), mod(scalar(left), OP_SASSIGN) );
3280af22
NIS		 3420 if (PL_eval_start)
3421 PL_eval_start = 0;
748a9306 3422 else {
dbfe47cf 3423 o = newSVOP(OP_CONST, 0, newSViv(PL_compiling.cop_arybase));
a0d0e21e
LW		 3424 }
3425 }
11343788 3426 return o;
79072805
LW		 3427}
3428
3429OP *
864dbfa3 3430Perl_newSTATEOP(pTHX_ I32 flags, char *label, OP *o)
79072805 3431{
27da23d5 3432 dVAR;
e1ec3a88 3433 const U32 seq = intro_my();
79072805
LW		 3434 register COP *cop;
3435
b7dc083c 3436 NewOp(1101, cop, 1, COP);
57843af0 3437 if (PERLDB_LINE && CopLINE(PL_curcop) && PL_curstash != PL_debstash) {
8990e307 3438 cop->op_type = OP_DBSTATE;
22c35a8c 3439 cop->op_ppaddr = PL_ppaddr[ OP_DBSTATE ];
8990e307
LW		 3440 }
3441 else {
3442 cop->op_type = OP_NEXTSTATE;
22c35a8c 3443 cop->op_ppaddr = PL_ppaddr[ OP_NEXTSTATE ];
8990e307 3444 }
eb160463
GS		 3445 cop->op_flags = (U8)flags;
3446 cop->op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
ff0cee69 3447#ifdef NATIVE_HINTS
3448 cop->op_private |= NATIVE_HINTS;
3449#endif
e24b16f9 3450 PL_compiling.op_private = cop->op_private;
79072805
LW		 3451 cop->op_next = (OP*)cop;
3452
463ee0b2
LW		 3453 if (label) {
3454 cop->cop_label = label;
3280af22 3455 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 3456 }
bbce6d69 3457 cop->cop_seq = seq;
3280af22 3458 cop->cop_arybase = PL_curcop->cop_arybase;
0453d815 3459 if (specialWARN(PL_curcop->cop_warnings))
599cee73 3460 cop->cop_warnings = PL_curcop->cop_warnings ;
1c846c1f 3461 else
599cee73 3462 cop->cop_warnings = newSVsv(PL_curcop->cop_warnings) ;
ac27b0f5
NIS		 3463 if (specialCopIO(PL_curcop->cop_io))
3464 cop->cop_io = PL_curcop->cop_io;
3465 else
3466 cop->cop_io = newSVsv(PL_curcop->cop_io) ;
599cee73 3467
79072805 3468
3280af22 3469 if (PL_copline == NOLINE)
57843af0 3470 CopLINE_set(cop, CopLINE(PL_curcop));
79072805 3471 else {
57843af0 3472 CopLINE_set(cop, PL_copline);
3280af22 3473 PL_copline = NOLINE;
79072805 3474 }
57843af0 3475#ifdef USE_ITHREADS
f4dd75d9 3476 CopFILE_set(cop, CopFILE(PL_curcop)); /* XXX share in a pvtable? */
57843af0 3477#else
f4dd75d9 3478 CopFILEGV_set(cop, CopFILEGV(PL_curcop));
57843af0 3479#endif
11faa288 3480 CopSTASH_set(cop, PL_curstash);
79072805 3481
3280af22 3482 if (PERLDB_LINE && PL_curstash != PL_debstash) {
2d03de9c
AL		 3483 SV ** const svp = av_fetch(CopFILEAV(PL_curcop), (I32)CopLINE(cop), FALSE);
3484 if (svp && *svp != &PL_sv_undef ) {
3485 (void)SvIOK_on(*svp);
45977657 3486 SvIV_set(*svp, PTR2IV(cop));
1eb1540c 3487 }
93a17b20
LW		 3488 }
3489
722969e2 3490 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 3491}
3492
bbce6d69 3493
79072805 3494OP *
864dbfa3 3495Perl_newLOGOP(pTHX_ I32 type, I32 flags, OP *first, OP *other)
79072805 3496{
27da23d5 3497 dVAR;
883ffac3
CS		 3498 return new_logop(type, flags, &first, &other);
3499}
3500
3bd495df 3501STATIC OP *
cea2e8a9 3502S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
883ffac3 3503{
27da23d5 3504 dVAR;
79072805 3505 LOGOP *logop;
11343788 3506 OP *o;
883ffac3
CS		 3507 OP *first = *firstp;
3508 OP *other = *otherp;
79072805 3509
a0d0e21e
LW		 3510 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
3511 return newBINOP(type, flags, scalar(first), scalar(other));
3512
8990e307 3513 scalarboolean(first);
79072805
LW		 3514 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
3515 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
3516 if (type == OP_AND || type == OP_OR) {
3517 if (type == OP_AND)
3518 type = OP_OR;
3519 else
3520 type = OP_AND;
11343788 3521 o = first;
883ffac3 3522 first = *firstp = cUNOPo->op_first;
11343788
MB		 3523 if (o->op_next)
3524 first->op_next = o->op_next;
3525 cUNOPo->op_first = Nullop;
3526 op_free(o);
79072805
LW		 3527 }
3528 }
3529 if (first->op_type == OP_CONST) {
39a440a3
DM		 3530 if (first->op_private & OPpCONST_STRICT)
3531 no_bareword_allowed(first);
041457d9 3532 else if ((first->op_private & OPpCONST_BARE) && ckWARN(WARN_BAREWORD))
989dfb19 3533 Perl_warner(aTHX_ packWARN(WARN_BAREWORD), "Bareword found in conditional");
75cc09e4
MHM		 3534 if ((type == OP_AND && SvTRUE(((SVOP*)first)->op_sv)) ||
3535 (type == OP_OR && !SvTRUE(((SVOP*)first)->op_sv)) ||
3536 (type == OP_DOR && !SvOK(((SVOP*)first)->op_sv))) {
79072805 3537 op_free(first);
883ffac3 3538 *firstp = Nullop;
d6fee5c7
DM		 3539 if (other->op_type == OP_CONST)
3540 other->op_private |= OPpCONST_SHORTCIRCUIT;
79072805
LW		 3541 return other;
3542 }
3543 else {
7921d0f2 3544 /* check for C<my $x if 0>, or C<my($x,$y) if 0> */
6867be6d 3545 const OP *o2 = other;
7921d0f2
DM		 3546 if ( ! (o2->op_type == OP_LIST
3547 && (( o2 = cUNOPx(o2)->op_first))
3548 && o2->op_type == OP_PUSHMARK
3549 && (( o2 = o2->op_sibling)) )
3550 )
3551 o2 = other;
3552 if ((o2->op_type == OP_PADSV || o2->op_type == OP_PADAV
3553 || o2->op_type == OP_PADHV)
3554 && o2->op_private & OPpLVAL_INTRO
3555 && ckWARN(WARN_DEPRECATED))
3556 {
3557 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
3558 "Deprecated use of my() in false conditional");
3559 }
3560
79072805 3561 op_free(other);
883ffac3 3562 *otherp = Nullop;
d6fee5c7
DM		 3563 if (first->op_type == OP_CONST)
3564 first->op_private |= OPpCONST_SHORTCIRCUIT;
79072805
LW		 3565 return first;
3566 }
3567 }
041457d9
DM		 3568 else if ((first->op_flags & OPf_KIDS) && type != OP_DOR
3569 && ckWARN(WARN_MISC)) /* [#24076] Don't warn for <FH> err FOO. */
59e10468 3570 {
6867be6d
AL		 3571 const OP *k1 = ((UNOP*)first)->op_first;
3572 const OP *k2 = k1->op_sibling;
a6006777 3573 OPCODE warnop = 0;
3574 switch (first->op_type)
3575 {
3576 case OP_NULL:
3577 if (k2 && k2->op_type == OP_READLINE
3578 && (k2->op_flags & OPf_STACKED)
1c846c1f 3579 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
72b16652 3580 {
a6006777 3581 warnop = k2->op_type;
72b16652 3582 }
a6006777 3583 break;
3584
3585 case OP_SASSIGN:
68dc0745 3586 if (k1->op_type == OP_READDIR
3587 || k1->op_type == OP_GLOB
72b16652 3588 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
68dc0745 3589 || k1->op_type == OP_EACH)
72b16652
GS		 3590 {
3591 warnop = ((k1->op_type == OP_NULL)
eb160463 3592 ? (OPCODE)k1->op_targ : k1->op_type);
72b16652 3593 }
a6006777 3594 break;
3595 }
8ebc5c01 3596 if (warnop) {
6867be6d 3597 const line_t oldline = CopLINE(PL_curcop);
57843af0 3598 CopLINE_set(PL_curcop, PL_copline);
9014280d 3599 Perl_warner(aTHX_ packWARN(WARN_MISC),
599cee73 3600 "Value of %s%s can be \"0\"; test with defined()",
22c35a8c 3601 PL_op_desc[warnop],
68dc0745 3602 ((warnop == OP_READLINE || warnop == OP_GLOB)
3603 ? " construct" : "() operator"));
57843af0 3604 CopLINE_set(PL_curcop, oldline);
8ebc5c01 3605 }
a6006777 3606 }
79072805
LW		 3607
3608 if (!other)
3609 return first;
3610
c963b151 3611 if (type == OP_ANDASSIGN || type == OP_ORASSIGN || type == OP_DORASSIGN)
a0d0e21e
LW		 3612 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
3613
b7dc083c 3614 NewOp(1101, logop, 1, LOGOP);
79072805 3615
eb160463 3616 logop->op_type = (OPCODE)type;
22c35a8c 3617 logop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3618 logop->op_first = first;
3619 logop->op_flags = flags | OPf_KIDS;
3620 logop->op_other = LINKLIST(other);
eb160463 3621 logop->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 3622
3623 /* establish postfix order */
3624 logop->op_next = LINKLIST(first);
3625 first->op_next = (OP*)logop;
3626 first->op_sibling = other;
3627
463d09e6
RGS		 3628 CHECKOP(type,logop);
3629
11343788
MB		 3630 o = newUNOP(OP_NULL, 0, (OP*)logop);
3631 other->op_next = o;
79072805 3632
11343788 3633 return o;
79072805
LW		 3634}
3635
3636OP *
864dbfa3 3637Perl_newCONDOP(pTHX_ I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 3638{
27da23d5 3639 dVAR;
1a67a97c
SM		 3640 LOGOP *logop;
3641 OP *start;
11343788 3642 OP *o;
79072805 3643
b1cb66bf 3644 if (!falseop)
3645 return newLOGOP(OP_AND, 0, first, trueop);
3646 if (!trueop)
3647 return newLOGOP(OP_OR, 0, first, falseop);
79072805 3648
8990e307 3649 scalarboolean(first);
79072805 3650 if (first->op_type == OP_CONST) {
2bc6235c
K		 3651 if (first->op_private & OPpCONST_BARE &&
3652 first->op_private & OPpCONST_STRICT) {
3653 no_bareword_allowed(first);
3654 }
79072805
LW		 3655 if (SvTRUE(((SVOP*)first)->op_sv)) {
3656 op_free(first);
b1cb66bf 3657 op_free(falseop);
3658 return trueop;
79072805
LW		 3659 }
3660 else {
3661 op_free(first);
b1cb66bf 3662 op_free(trueop);
3663 return falseop;
79072805
LW		 3664 }
3665 }
1a67a97c
SM		 3666 NewOp(1101, logop, 1, LOGOP);
3667 logop->op_type = OP_COND_EXPR;
3668 logop->op_ppaddr = PL_ppaddr[OP_COND_EXPR];
3669 logop->op_first = first;
3670 logop->op_flags = flags | OPf_KIDS;
eb160463 3671 logop->op_private = (U8)(1 | (flags >> 8));
1a67a97c
SM		 3672 logop->op_other = LINKLIST(trueop);
3673 logop->op_next = LINKLIST(falseop);
79072805 3674
463d09e6
RGS		 3675 CHECKOP(OP_COND_EXPR, /* that's logop->op_type */
3676 logop);
79072805
LW		 3677
3678 /* establish postfix order */
1a67a97c
SM		 3679 start = LINKLIST(first);
3680 first->op_next = (OP*)logop;
79072805 3681
b1cb66bf 3682 first->op_sibling = trueop;
3683 trueop->op_sibling = falseop;
1a67a97c 3684 o = newUNOP(OP_NULL, 0, (OP*)logop);
79072805 3685
1a67a97c 3686 trueop->op_next = falseop->op_next = o;
79072805 3687
1a67a97c 3688 o->op_next = start;
11343788 3689 return o;
79072805
LW		 3690}
3691
3692OP *
864dbfa3 3693Perl_newRANGE(pTHX_ I32 flags, OP *left, OP *right)
79072805 3694{
27da23d5 3695 dVAR;
1a67a97c 3696 LOGOP *range;
79072805
LW		 3697 OP *flip;
3698 OP *flop;
1a67a97c 3699 OP *leftstart;
11343788 3700 OP *o;
79072805 3701
1a67a97c 3702 NewOp(1101, range, 1, LOGOP);
79072805 3703
1a67a97c
SM		 3704 range->op_type = OP_RANGE;
3705 range->op_ppaddr = PL_ppaddr[OP_RANGE];
3706 range->op_first = left;
3707 range->op_flags = OPf_KIDS;
3708 leftstart = LINKLIST(left);
3709 range->op_other = LINKLIST(right);
eb160463 3710 range->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 3711
3712 left->op_sibling = right;
3713
1a67a97c
SM		 3714 range->op_next = (OP*)range;
3715 flip = newUNOP(OP_FLIP, flags, (OP*)range);
79072805 3716 flop = newUNOP(OP_FLOP, 0, flip);
11343788 3717 o = newUNOP(OP_NULL, 0, flop);
79072805 3718 linklist(flop);
1a67a97c 3719 range->op_next = leftstart;
79072805
LW		 3720
3721 left->op_next = flip;
3722 right->op_next = flop;
3723
1a67a97c
SM		 3724 range->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
3725 sv_upgrade(PAD_SV(range->op_targ), SVt_PVNV);
ed6116ce 3726 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 3727 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
3728
3729 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3730 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3731
11343788 3732 flip->op_next = o;
79072805 3733 if (!flip->op_private || !flop->op_private)
11343788 3734 linklist(o); /* blow off optimizer unless constant */
79072805 3735
11343788 3736 return o;
79072805
LW		 3737}
3738
3739OP *
864dbfa3 3740Perl_newLOOPOP(pTHX_ I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 3741{
463ee0b2 3742 OP* listop;
11343788 3743 OP* o;
73d840c0 3744 const bool once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 3745 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
46c461b5
AL		 3746
3747 PERL_UNUSED_ARG(debuggable);
93a17b20 3748
463ee0b2
LW		 3749 if (expr) {
3750 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
3751 return block; /* do {} while 0 does once */
fb73857a 3752 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3753 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 3754 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3755 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4 3756 } else if (expr->op_flags & OPf_KIDS) {
46c461b5
AL		 3757 const OP * const k1 = ((UNOP*)expr)->op_first;
3758 const OP * const k2 = k1 ? k1->op_sibling : NULL;
55d729e4 3759 switch (expr->op_type) {
1c846c1f 3760 case OP_NULL:
55d729e4
GS		 3761 if (k2 && k2->op_type == OP_READLINE
3762 && (k2->op_flags & OPf_STACKED)
1c846c1f 3763 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
55d729e4 3764 expr = newUNOP(OP_DEFINED, 0, expr);
1c846c1f 3765 break;
55d729e4
GS		 3766
3767 case OP_SASSIGN:
3768 if (k1->op_type == OP_READDIR
3769 || k1->op_type == OP_GLOB
6531c3e6 3770 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
55d729e4
GS		 3771 || k1->op_type == OP_EACH)
3772 expr = newUNOP(OP_DEFINED, 0, expr);
3773 break;
3774 }
774d564b 3775 }
463ee0b2 3776 }
93a17b20 3777
e1548254
RGS		 3778 /* if block is null, the next append_elem() would put UNSTACK, a scalar
3779 * op, in listop. This is wrong. [perl #27024] */
3780 if (!block)
3781 block = newOP(OP_NULL, 0);
8990e307 3782 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
883ffac3 3783 o = new_logop(OP_AND, 0, &expr, &listop);
463ee0b2 3784
883ffac3
CS		 3785 if (listop)
3786 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 3787
11343788
MB		 3788 if (once && o != listop)
3789 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 3790
11343788
MB		 3791 if (o == listop)
3792 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 3793
11343788
MB		 3794 o->op_flags |= flags;
3795 o = scope(o);
3796 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
3797 return o;
79072805
LW		 3798}
3799
3800OP *
a034e688
DM		 3801Perl_newWHILEOP(pTHX_ I32 flags, I32 debuggable, LOOP *loop, I32
3802whileline, OP *expr, OP *block, OP *cont, I32 has_my)
79072805 3803{
27da23d5 3804 dVAR;
79072805
LW		 3805 OP *redo;
3806 OP *next = 0;
3807 OP *listop;
11343788 3808 OP *o;
1ba6ee2b 3809 U8 loopflags = 0;
46c461b5
AL		 3810
3811 PERL_UNUSED_ARG(debuggable);
79072805 3812
2d03de9c
AL		 3813 if (expr) {
3814 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3815 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
3816 expr = newUNOP(OP_DEFINED, 0,
3817 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
3818 } else if (expr->op_flags & OPf_KIDS) {
3819 const OP * const k1 = ((UNOP*)expr)->op_first;
3820 const OP * const k2 = (k1) ? k1->op_sibling : NULL;
3821 switch (expr->op_type) {
3822 case OP_NULL:
3823 if (k2 && k2->op_type == OP_READLINE
3824 && (k2->op_flags & OPf_STACKED)
3825 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
3826 expr = newUNOP(OP_DEFINED, 0, expr);
3827 break;
55d729e4 3828
2d03de9c
AL		 3829 case OP_SASSIGN:
3830 if (k1->op_type == OP_READDIR
3831 || k1->op_type == OP_GLOB
3832 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
3833 || k1->op_type == OP_EACH)
3834 expr = newUNOP(OP_DEFINED, 0, expr);
3835 break;
3836 }
55d729e4 3837 }
748a9306 3838 }
79072805
LW		 3839
3840 if (!block)
3841 block = newOP(OP_NULL, 0);
a034e688 3842 else if (cont || has_my) {
87246558
GS		 3843 block = scope(block);
3844 }
79072805 3845
1ba6ee2b 3846 if (cont) {
79072805 3847 next = LINKLIST(cont);
1ba6ee2b 3848 }
fb73857a 3849 if (expr) {
85538317
GS		 3850 OP *unstack = newOP(OP_UNSTACK, 0);
3851 if (!next)
3852 next = unstack;
3853 cont = append_elem(OP_LINESEQ, cont, unstack);
fb73857a 3854 }
79072805 3855
463ee0b2 3856 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 3857 redo = LINKLIST(listop);
3858
3859 if (expr) {
eb160463 3860 PL_copline = (line_t)whileline;
883ffac3
CS		 3861 scalar(listop);
3862 o = new_logop(OP_AND, 0, &expr, &listop);
11343788 3863 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 3864 op_free(expr); /* oops, it's a while (0) */
463ee0b2 3865 op_free((OP*)loop);
883ffac3 3866 return Nullop; /* listop already freed by new_logop */
463ee0b2 3867 }
883ffac3 3868 if (listop)
497b47a8 3869 ((LISTOP*)listop)->op_last->op_next =
883ffac3 3870 (o == listop ? redo : LINKLIST(o));
79072805
LW		 3871 }
3872 else
11343788 3873 o = listop;
79072805
LW		 3874
3875 if (!loop) {
b7dc083c 3876 NewOp(1101,loop,1,LOOP);
79072805 3877 loop->op_type = OP_ENTERLOOP;
22c35a8c 3878 loop->op_ppaddr = PL_ppaddr[OP_ENTERLOOP];
79072805
LW		 3879 loop->op_private = 0;
3880 loop->op_next = (OP*)loop;
3881 }
3882
11343788 3883 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 3884
3885 loop->op_redoop = redo;
11343788 3886 loop->op_lastop = o;
1ba6ee2b 3887 o->op_private |= loopflags;
79072805
LW		 3888
3889 if (next)
3890 loop->op_nextop = next;
3891 else
11343788 3892 loop->op_nextop = o;
79072805 3893
11343788
MB		 3894 o->op_flags |= flags;
3895 o->op_private |= (flags >> 8);
3896 return o;
79072805
LW		 3897}
3898
3899OP *
66a1b24b 3900Perl_newFOROP(pTHX_ I32 flags, char *label, line_t forline, OP *sv, OP *expr, OP *block, OP *cont)
79072805 3901{
27da23d5 3902 dVAR;
79072805 3903 LOOP *loop;
fb73857a 3904 OP *wop;
4bbc6d12 3905 PADOFFSET padoff = 0;
4633a7c4 3906 I32 iterflags = 0;
241416b8 3907 I32 iterpflags = 0;
79072805 3908
79072805 3909 if (sv) {
85e6fe83 3910 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
241416b8 3911 iterpflags = sv->op_private & OPpOUR_INTRO; /* for our $x () */
748a9306 3912 sv->op_type = OP_RV2GV;
22c35a8c 3913 sv->op_ppaddr = PL_ppaddr[OP_RV2GV];
79072805 3914 }
85e6fe83 3915 else if (sv->op_type == OP_PADSV) { /* private variable */
241416b8 3916 iterpflags = sv->op_private & OPpLVAL_INTRO; /* for my $x () */
85e6fe83 3917 padoff = sv->op_targ;
743e66e6 3918 sv->op_targ = 0;
85e6fe83
LW		 3919 op_free(sv);
3920 sv = Nullop;
3921 }
54b9620d
MB		 3922 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
3923 padoff = sv->op_targ;
743e66e6 3924 sv->op_targ = 0;
54b9620d
MB		 3925 iterflags |= OPf_SPECIAL;
3926 op_free(sv);
3927 sv = Nullop;
3928 }
79072805 3929 else
cea2e8a9 3930 Perl_croak(aTHX_ "Can't use %s for loop variable", PL_op_desc[sv->op_type]);
79072805
LW		 3931 }
3932 else {
73d840c0 3933 const I32 offset = pad_findmy("$_");
aabe9514
RGS		 3934 if (offset == NOT_IN_PAD || PAD_COMPNAME_FLAGS(offset) & SVpad_OUR) {
3935 sv = newGVOP(OP_GV, 0, PL_defgv);
3936 }
3937 else {
3938 padoff = offset;
aabe9514 3939 }
79072805 3940 }
5f05dabc 3941 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
89ea2908 3942 expr = mod(force_list(scalar(ref(expr, OP_ITER))), OP_GREPSTART);
4633a7c4
LW		 3943 iterflags |= OPf_STACKED;
3944 }
89ea2908
GA		 3945 else if (expr->op_type == OP_NULL &&
3946 (expr->op_flags & OPf_KIDS) &&
3947 ((BINOP*)expr)->op_first->op_type == OP_FLOP)
3948 {
3949 /* Basically turn for($x..$y) into the same as for($x,$y), but we
3950 * set the STACKED flag to indicate that these values are to be
3951 * treated as min/max values by 'pp_iterinit'.
3952 */
3953 UNOP* flip = (UNOP*)((UNOP*)((BINOP*)expr)->op_first)->op_first;
1a67a97c 3954 LOGOP* range = (LOGOP*) flip->op_first;
66a1b24b
AL		 3955 OP* const left = range->op_first;
3956 OP* const right = left->op_sibling;
5152d7c7 3957 LISTOP* listop;
89ea2908
GA		 3958
3959 range->op_flags &= ~OPf_KIDS;
3960 range->op_first = Nullop;
3961
5152d7c7 3962 listop = (LISTOP*)newLISTOP(OP_LIST, 0, left, right);
1a67a97c
SM		 3963 listop->op_first->op_next = range->op_next;
3964 left->op_next = range->op_other;
5152d7c7
GS		 3965 right->op_next = (OP*)listop;
3966 listop->op_next = listop->op_first;
89ea2908
GA		 3967
3968 op_free(expr);
5152d7c7 3969 expr = (OP*)(listop);
93c66552 3970 op_null(expr);
89ea2908
GA		 3971 iterflags |= OPf_STACKED;
3972 }
3973 else {
3974 expr = mod(force_list(expr), OP_GREPSTART);
3975 }
3976
4633a7c4 3977 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
89ea2908 3978 append_elem(OP_LIST, expr, scalar(sv))));
85e6fe83 3979 assert(!loop->op_next);
241416b8 3980 /* for my $x () sets OPpLVAL_INTRO;
14f338dc 3981 * for our $x () sets OPpOUR_INTRO */
c5661c80 3982 loop->op_private = (U8)iterpflags;
b7dc083c 3983#ifdef PL_OP_SLAB_ALLOC
155aba94
GS		 3984 {
3985 LOOP *tmp;
3986 NewOp(1234,tmp,1,LOOP);
bd5f3bc4 3987 Copy(loop,tmp,1,LISTOP);
238a4c30 3988 FreeOp(loop);
155aba94
GS		 3989 loop = tmp;
3990 }
b7dc083c 3991#else
85e6fe83 3992 Renew(loop, 1, LOOP);
1c846c1f 3993#endif
85e6fe83 3994 loop->op_targ = padoff;
a034e688 3995 wop = newWHILEOP(flags, 1, loop, forline, newOP(OP_ITER, 0), block, cont, 0);
3280af22 3996 PL_copline = forline;
fb73857a 3997 return newSTATEOP(0, label, wop);
79072805
LW		 3998}
3999
8990e307 4000OP*
864dbfa3 4001Perl_newLOOPEX(pTHX_ I32 type, OP *label)
8990e307 4002{
11343788 4003 OP *o;
2d8e6c8d 4004
8990e307 4005 if (type != OP_GOTO || label->op_type == OP_CONST) {
cdaebead
MB		 4006 /* "last()" means "last" */
4007 if (label->op_type == OP_STUB && (label->op_flags & OPf_PARENS))
4008 o = newOP(type, OPf_SPECIAL);
4009 else {
4010 o = newPVOP(type, 0, savepv(label->op_type == OP_CONST
8b6b16e7 4011 ? SvPVx_nolen_const(((SVOP*)label)->op_sv)
cdaebead
MB		 4012 : ""));
4013 }
8990e307
LW		 4014 op_free(label);
4015 }
4016 else {
e3aba57a
RGS		 4017 /* Check whether it's going to be a goto &function */
4018 if (label->op_type == OP_ENTERSUB
4019 && !(label->op_flags & OPf_STACKED))
a0d0e21e 4020 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
11343788 4021 o = newUNOP(type, OPf_STACKED, label);
8990e307 4022 }
3280af22 4023 PL_hints |= HINT_BLOCK_SCOPE;
11343788 4024 return o;
8990e307
LW		 4025}
4026
7dafbf52
DM		 4027/*
4028=for apidoc cv_undef
4029
4030Clear out all the active components of a CV. This can happen either
4031by an explicit C<undef &foo>, or by the reference count going to zero.
4032In the former case, we keep the CvOUTSIDE pointer, so that any anonymous
4033children can still follow the full lexical scope chain.
4034
4035=cut
4036*/
4037
79072805 4038void
864dbfa3 4039Perl_cv_undef(pTHX_ CV *cv)
79072805 4040{
27da23d5 4041 dVAR;
a636914a 4042#ifdef USE_ITHREADS
35f1c1c7
SB		 4043 if (CvFILE(cv) && !CvXSUB(cv)) {
4044 /* for XSUBs CvFILE point directly to static memory; __FILE__ */
a636914a 4045 Safefree(CvFILE(cv));
a636914a 4046 }
f3e31eb5 4047 CvFILE(cv) = 0;
a636914a
RH		 4048#endif
4049
a0d0e21e
LW		 4050 if (!CvXSUB(cv) && CvROOT(cv)) {
4051 if (CvDEPTH(cv))
cea2e8a9 4052 Perl_croak(aTHX_ "Can't undef active subroutine");
8990e307 4053 ENTER;
a0d0e21e 4054
f3548bdc 4055 PAD_SAVE_SETNULLPAD();
a0d0e21e 4056
282f25c9 4057 op_free(CvROOT(cv));
79072805 4058 CvROOT(cv) = Nullop;
8f476eee 4059 CvSTART(cv) = Nullop;
8990e307 4060 LEAVE;
79072805 4061 }
1d5db326 4062 SvPOK_off((SV*)cv); /* forget prototype */
8e07c86e 4063 CvGV(cv) = Nullgv;
a3985cdc
DM		 4064
4065 pad_undef(cv);
4066
7dafbf52
DM		 4067 /* remove CvOUTSIDE unless this is an undef rather than a free */
4068 if (!SvREFCNT(cv) && CvOUTSIDE(cv)) {
4069 if (!CvWEAKOUTSIDE(cv))
4070 SvREFCNT_dec(CvOUTSIDE(cv));
4071 CvOUTSIDE(cv) = Nullcv;
4072 }
beab0874
JT		 4073 if (CvCONST(cv)) {
4074 SvREFCNT_dec((SV*)CvXSUBANY(cv).any_ptr);
4075 CvCONST_off(cv);
4076 }
50762d59
DM		 4077 if (CvXSUB(cv)) {
4078 CvXSUB(cv) = 0;
4079 }
7dafbf52
DM		 4080 /* delete all flags except WEAKOUTSIDE */
4081 CvFLAGS(cv) &= CVf_WEAKOUTSIDE;
79072805
LW		 4082}
4083
3fe9a6f1 4084void
35a4481c 4085Perl_cv_ckproto(pTHX_ const CV *cv, const GV *gv, const char *p)
3fe9a6f1 4086{
b15aece3 4087 if (((!p != !SvPOK(cv)) || (p && strNE(p, SvPVX_const(cv)))) && ckWARN_d(WARN_PROTOTYPE)) {
2d03de9c 4088 SV* const msg = sv_newmortal();
3fe9a6f1 4089 SV* name = Nullsv;
4090
4091 if (gv)
46fc3d4c 4092 gv_efullname3(name = sv_newmortal(), gv, Nullch);
4093 sv_setpv(msg, "Prototype mismatch:");
4094 if (name)
894356b3 4095 Perl_sv_catpvf(aTHX_ msg, " sub %"SVf, name);
3fe9a6f1 4096 if (SvPOK(cv))
e1ec3a88 4097 Perl_sv_catpvf(aTHX_ msg, " (%"SVf")", (const SV *)cv);
ebe643b9 4098 else
54667de8 4099 Perl_sv_catpv(aTHX_ msg, ": none");
46fc3d4c 4100 sv_catpv(msg, " vs ");
4101 if (p)
cea2e8a9 4102 Perl_sv_catpvf(aTHX_ msg, "(%s)", p);
46fc3d4c 4103 else
4104 sv_catpv(msg, "none");
9014280d 4105 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE), "%"SVf, msg);
3fe9a6f1 4106 }
4107}
4108
35f1c1c7
SB		 4109static void const_sv_xsub(pTHX_ CV* cv);
4110
beab0874 4111/*
ccfc67b7
JH		 4112
4113=head1 Optree Manipulation Functions
4114
beab0874
JT		 4115=for apidoc cv_const_sv
4116
4117If C<cv> is a constant sub eligible for inlining. returns the constant
4118value returned by the sub. Otherwise, returns NULL.
4119
4120Constant subs can be created with C<newCONSTSUB> or as described in
4121L<perlsub/"Constant Functions">.
4122
4123=cut
4124*/
760ac839 4125SV *
864dbfa3 4126Perl_cv_const_sv(pTHX_ CV *cv)
760ac839 4127{
beab0874 4128 if (!cv || !CvCONST(cv))
54310121 4129 return Nullsv;
beab0874 4130 return (SV*)CvXSUBANY(cv).any_ptr;
fe5e78ed 4131}
760ac839 4132
b5c19bd7
DM		 4133/* op_const_sv: examine an optree to determine whether it's in-lineable.
4134 * Can be called in 3 ways:
4135 *
4136 * !cv
4137 * look for a single OP_CONST with attached value: return the value
4138 *
4139 * cv && CvCLONE(cv) && !CvCONST(cv)
4140 *
4141 * examine the clone prototype, and if contains only a single
4142 * OP_CONST referencing a pad const, or a single PADSV referencing
4143 * an outer lexical, return a non-zero value to indicate the CV is
4144 * a candidate for "constizing" at clone time
4145 *
4146 * cv && CvCONST(cv)
4147 *
4148 * We have just cloned an anon prototype that was marked as a const
4149 * candidiate. Try to grab the current value, and in the case of
4150 * PADSV, ignore it if it has multiple references. Return the value.
4151 */
4152
fe5e78ed 4153SV *
6867be6d 4154Perl_op_const_sv(pTHX_ const OP *o, CV *cv)
fe5e78ed
GS		 4155{
4156 SV *sv = Nullsv;
4157
0f79a09d 4158 if (!o)
fe5e78ed 4159 return Nullsv;
1c846c1f
NIS		 4160
4161 if (o->op_type == OP_LINESEQ && cLISTOPo->op_first)
fe5e78ed
GS		 4162 o = cLISTOPo->op_first->op_sibling;
4163
4164 for (; o; o = o->op_next) {
890ce7af 4165 const OPCODE type = o->op_type;
fe5e78ed 4166
1c846c1f 4167 if (sv && o->op_next == o)
fe5e78ed 4168 return sv;
e576b457
JT		 4169 if (o->op_next != o) {
4170 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
4171 continue;
4172 if (type == OP_DBSTATE)
4173 continue;
4174 }
54310121 4175 if (type == OP_LEAVESUB || type == OP_RETURN)
4176 break;
4177 if (sv)
4178 return Nullsv;
7766f137 4179 if (type == OP_CONST && cSVOPo->op_sv)
5dc0d613 4180 sv = cSVOPo->op_sv;
b5c19bd7 4181 else if (cv && type == OP_CONST) {
dd2155a4 4182 sv = PAD_BASE_SV(CvPADLIST(cv), o->op_targ);
beab0874
JT		 4183 if (!sv)
4184 return Nullsv;
b5c19bd7
DM		 4185 }
4186 else if (cv && type == OP_PADSV) {
4187 if (CvCONST(cv)) { /* newly cloned anon */
4188 sv = PAD_BASE_SV(CvPADLIST(cv), o->op_targ);
4189 /* the candidate should have 1 ref from this pad and 1 ref
4190 * from the parent */
4191 if (!sv || SvREFCNT(sv) != 2)
4192 return Nullsv;
beab0874 4193 sv = newSVsv(sv);
b5c19bd7
DM		 4194 SvREADONLY_on(sv);
4195 return sv;
4196 }
4197 else {
4198 if (PAD_COMPNAME_FLAGS(o->op_targ) & SVf_FAKE)
4199 sv = &PL_sv_undef; /* an arbitrary non-null value */
beab0874 4200 }
760ac839 4201 }
b5c19bd7 4202 else {
54310121 4203 return Nullsv;
b5c19bd7 4204 }
760ac839
LW		 4205 }
4206 return sv;
4207}
4208
09bef843
SB		 4209void
4210Perl_newMYSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
4211{
46c461b5
AL		 4212 PERL_UNUSED_ARG(floor);
4213
09bef843
SB		 4214 if (o)
4215 SAVEFREEOP(o);
4216 if (proto)
4217 SAVEFREEOP(proto);
4218 if (attrs)
4219 SAVEFREEOP(attrs);
4220 if (block)
4221 SAVEFREEOP(block);
4222 Perl_croak(aTHX_ "\"my sub\" not yet implemented");
4223}
4224
748a9306 4225CV *
864dbfa3 4226Perl_newSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *block)
79072805 4227{
09bef843
SB		 4228 return Perl_newATTRSUB(aTHX_ floor, o, proto, Nullop, block);
4229}
4230
4231CV *
4232Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
4233{
27da23d5 4234 dVAR;
6867be6d 4235 const char *aname;
83ee9e09 4236 GV *gv;
5c144d81 4237 const char *ps;
ea6e9374 4238 STRLEN ps_len;
a2008d6d 4239 register CV *cv=0;
beab0874 4240 SV *const_sv;
61dbb99a 4241 I32 gv_fetch_flags;
79072805 4242
8b6b16e7 4243 const char * const name = o ? SvPVx_nolen_const(cSVOPo->op_sv) : Nullch;
8e742a20
MHM		 4244
4245 if (proto) {
4246 assert(proto->op_type == OP_CONST);
5c144d81 4247 ps = SvPVx_const(((SVOP*)proto)->op_sv, ps_len);
8e742a20
MHM		 4248 }
4249 else
4250 ps = Nullch;
4251
83ee9e09 4252 if (!name && PERLDB_NAMEANON && CopLINE(PL_curcop)) {
aec46f14 4253 SV * const sv = sv_newmortal();
c99da370
JH		 4254 Perl_sv_setpvf(aTHX_ sv, "%s[%s:%"IVdf"]",
4255 PL_curstash ? "__ANON__" : "__ANON__::__ANON__",
83ee9e09 4256 CopFILE(PL_curcop), (IV)CopLINE(PL_curcop));
b15aece3 4257 aname = SvPVX_const(sv);
83ee9e09
GS		 4258 }
4259 else
4260 aname = Nullch;
61dbb99a
SF		 4261
4262 gv_fetch_flags = (block || attrs || (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS))
4263 ? GV_ADDMULTI : GV_ADDMULTI | GV_NOINIT;
4264 gv = name ? gv_fetchsv(cSVOPo->op_sv, gv_fetch_flags, SVt_PVCV)
7a5fd60d
NC		 4265 : gv_fetchpv(aname ? aname
4266 : (PL_curstash ? "__ANON__" : "__ANON__::__ANON__"),
61dbb99a 4267 gv_fetch_flags, SVt_PVCV);
83ee9e09 4268
11343788 4269 if (o)
5dc0d613 4270 SAVEFREEOP(o);
3fe9a6f1 4271 if (proto)
4272 SAVEFREEOP(proto);
09bef843
SB		 4273 if (attrs)
4274 SAVEFREEOP(attrs);
3fe9a6f1 4275
09bef843 4276 if (SvTYPE(gv) != SVt_PVGV) { /* Maybe prototype now, and had at
55d729e4
GS		 4277 maximum a prototype before. */
4278 if (SvTYPE(gv) > SVt_NULL) {
0453d815 4279 if (!SvPOK((SV*)gv) && !(SvIOK((SV*)gv) && SvIVX((SV*)gv) == -1)
e476b1b5 4280 && ckWARN_d(WARN_PROTOTYPE))
f248d071 4281 {
9014280d 4282 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE), "Runaway prototype");
f248d071 4283 }
55d729e4
GS		 4284 cv_ckproto((CV*)gv, NULL, ps);
4285 }
4286 if (ps)
ea6e9374 4287 sv_setpvn((SV*)gv, ps, ps_len);
55d729e4
GS		 4288 else
4289 sv_setiv((SV*)gv, -1);
3280af22
NIS		 4290 SvREFCNT_dec(PL_compcv);
4291 cv = PL_compcv = NULL;
4292 PL_sub_generation++;
beab0874 4293 goto done;
55d729e4
GS		 4294 }
4295
beab0874
JT		 4296 cv = (!name || GvCVGEN(gv)) ? Nullcv : GvCV(gv);
4297
7fb37951
AMS		 4298#ifdef GV_UNIQUE_CHECK
4299 if (cv && GvUNIQUE(gv) && SvREADONLY(cv)) {
4300 Perl_croak(aTHX_ "Can't define subroutine %s (GV is unique)", name);
5bd07a3d
DM		 4301 }
4302#endif
4303
2e8a6c53 4304 if (!block || !ps || *ps || attrs || (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS))
beab0874
JT		 4305 const_sv = Nullsv;
4306 else
4307 const_sv = op_const_sv(block, Nullcv);
4308
4309 if (cv) {
6867be6d 4310 const bool exists = CvROOT(cv) || CvXSUB(cv);
5bd07a3d 4311
7fb37951
AMS		 4312#ifdef GV_UNIQUE_CHECK
4313 if (exists && GvUNIQUE(gv)) {
4314 Perl_croak(aTHX_ "Can't redefine unique subroutine %s", name);
5bd07a3d
DM		 4315 }
4316#endif
4317
60ed1d8c
GS		 4318 /* if the subroutine doesn't exist and wasn't pre-declared
4319 * with a prototype, assume it will be AUTOLOADed,
4320 * skipping the prototype check
4321 */
4322 if (exists || SvPOK(cv))
01ec43d0 4323 cv_ckproto(cv, gv, ps);
68dc0745 4324 /* already defined (or promised)? */
60ed1d8c 4325 if (exists || GvASSUMECV(gv)) {
09bef843 4326 if (!block && !attrs) {
d3cea301
SB		 4327 if (CvFLAGS(PL_compcv)) {
4328 /* might have had built-in attrs applied */
4329 CvFLAGS(cv) |= (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS);
4330 }
aa689395 4331 /* just a "sub foo;" when &foo is already defined */
3280af22 4332 SAVEFREESV(PL_compcv);
aa689395 4333 goto done;
4334 }
7bac28a0 4335 /* ahem, death to those who redefine active sort subs */
3280af22 4336 if (PL_curstackinfo->si_type == PERLSI_SORT && PL_sortcop == CvSTART(cv))
cea2e8a9 4337 Perl_croak(aTHX_ "Can't redefine active sort subroutine %s", name);
beab0874
JT		 4338 if (block) {
4339 if (ckWARN(WARN_REDEFINE)
4340 || (CvCONST(cv)
4341 && (!const_sv || sv_cmp(cv_const_sv(cv), const_sv))))
4342 {
6867be6d 4343 const line_t oldline = CopLINE(PL_curcop);
d8a34499
IK		 4344 if (PL_copline != NOLINE)
4345 CopLINE_set(PL_curcop, PL_copline);
9014280d 4346 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
beab0874
JT		 4347 CvCONST(cv) ? "Constant subroutine %s redefined"
4348 : "Subroutine %s redefined", name);
4349 CopLINE_set(PL_curcop, oldline);
4350 }
4351 SvREFCNT_dec(cv);
4352 cv = Nullcv;
79072805 4353 }
79072805
LW		 4354 }
4355 }
beab0874 4356 if (const_sv) {
7fc63493 4357 (void)SvREFCNT_inc(const_sv);
beab0874 4358 if (cv) {
0768512c 4359 assert(!CvROOT(cv) && !CvCONST(cv));
c69006e4 4360 sv_setpvn((SV*)cv, "", 0); /* prototype is "" */
beab0874
JT		 4361 CvXSUBANY(cv).any_ptr = const_sv;
4362 CvXSUB(cv) = const_sv_xsub;
4363 CvCONST_on(cv);
beab0874
JT		 4364 }
4365 else {
4366 GvCV(gv) = Nullcv;
4367 cv = newCONSTSUB(NULL, name, const_sv);
4368 }
4369 op_free(block);
4370 SvREFCNT_dec(PL_compcv);
4371 PL_compcv = NULL;
4372 PL_sub_generation++;
4373 goto done;
4374 }
09bef843
SB		 4375 if (attrs) {
4376 HV *stash;
4377 SV *rcv;
4378
4379 /* Need to do a C<use attributes $stash_of_cv,\&cv,@attrs>
4380 * before we clobber PL_compcv.
4381 */
4382 if (cv && !block) {
4383 rcv = (SV*)cv;
020f0e03
SB		 4384 /* Might have had built-in attributes applied -- propagate them. */
4385 CvFLAGS(cv) |= (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS);
a9164de8 4386 if (CvGV(cv) && GvSTASH(CvGV(cv)))
09bef843 4387 stash = GvSTASH(CvGV(cv));
a9164de8 4388 else if (CvSTASH(cv))
09bef843
SB		 4389 stash = CvSTASH(cv);
4390 else
4391 stash = PL_curstash;
4392 }
4393 else {
4394 /* possibly about to re-define existing subr -- ignore old cv */
4395 rcv = (SV*)PL_compcv;
a9164de8 4396 if (name && GvSTASH(gv))
09bef843
SB		 4397 stash = GvSTASH(gv);
4398 else
4399 stash = PL_curstash;
4400 }
95f0a2f1 4401 apply_attrs(stash, rcv, attrs, FALSE);
09bef843 4402 }
a0d0e21e 4403 if (cv) { /* must reuse cv if autoloaded */
09bef843
SB		 4404 if (!block) {
4405 /* got here with just attrs -- work done, so bug out */
4406 SAVEFREESV(PL_compcv);
4407 goto done;
4408 }
a3985cdc 4409 /* transfer PL_compcv to cv */
4633a7c4 4410 cv_undef(cv);
3280af22 4411 CvFLAGS(cv) = CvFLAGS(PL_compcv);
5c41a5fa
DM		 4412 if (!CvWEAKOUTSIDE(cv))
4413 SvREFCNT_dec(CvOUTSIDE(cv));
3280af22 4414 CvOUTSIDE(cv) = CvOUTSIDE(PL_compcv);
a3985cdc 4415 CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(PL_compcv);
3280af22
NIS		 4416 CvOUTSIDE(PL_compcv) = 0;
4417 CvPADLIST(cv) = CvPADLIST(PL_compcv);
4418 CvPADLIST(PL_compcv) = 0;
282f25c9 4419 /* inner references to PL_compcv must be fixed up ... */
dd2155a4 4420 pad_fixup_inner_anons(CvPADLIST(cv), PL_compcv, cv);
282f25c9 4421 /* ... before we throw it away */
3280af22 4422 SvREFCNT_dec(PL_compcv);
b5c19bd7 4423 PL_compcv = cv;
a933f601
IZ		 4424 if (PERLDB_INTER)/* Advice debugger on the new sub. */
4425 ++PL_sub_generation;
a0d0e21e
LW		 4426 }
4427 else {
3280af22 4428 cv = PL_compcv;
44a8e56a 4429 if (name) {
4430 GvCV(gv) = cv;
4431 GvCVGEN(gv) = 0;
3280af22 4432 PL_sub_generation++;
44a8e56a 4433 }
a0d0e21e 4434 }
65c50114 4435 CvGV(cv) = gv;
a636914a 4436 CvFILE_set_from_cop(cv, PL_curcop);
3280af22 4437 CvSTASH(cv) = PL_curstash;
8990e307 4438
3fe9a6f1 4439 if (ps)
ea6e9374 4440 sv_setpvn((SV*)cv, ps, ps_len);
4633a7c4 4441
3280af22 4442 if (PL_error_count) {
c07a80fd 4443 op_free(block);
4444 block = Nullop;
68dc0745 4445 if (name) {
6867be6d 4446 const char *s = strrchr(name, ':');
68dc0745 4447 s = s ? s+1 : name;
6d4c2119 4448 if (strEQ(s, "BEGIN")) {
e1ec3a88 4449 const char not_safe[] =
6d4c2119 4450 "BEGIN not safe after errors--compilation aborted";
faef0170 4451 if (PL_in_eval & EVAL_KEEPERR)
cea2e8a9 4452 Perl_croak(aTHX_ not_safe);
6d4c2119
CS		 4453 else {
4454 /* force display of errors found but not reported */
38a03e6e 4455 sv_catpv(ERRSV, not_safe);
35c1215d 4456 Perl_croak(aTHX_ "%"SVf, ERRSV);
6d4c2119
CS		 4457 }
4458 }
68dc0745 4459 }
c07a80fd 4460 }
beab0874
JT		 4461 if (!block)
4462 goto done;
a0d0e21e 4463
7766f137 4464 if (CvLVALUE(cv)) {
78f9721b
SM		 4465 CvROOT(cv) = newUNOP(OP_LEAVESUBLV, 0,
4466 mod(scalarseq(block), OP_LEAVESUBLV));
7766f137
GS		 4467 }
4468 else {
09c2fd24
AE		 4469 /* This makes sub {}; work as expected. */
4470 if (block->op_type == OP_STUB) {
4471 op_free(block);
4472 block = newSTATEOP(0, Nullch, 0);
4473 }
7766f137
GS		 4474 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
4475 }
4476 CvROOT(cv)->op_private |= OPpREFCOUNTED;
4477 OpREFCNT_set(CvROOT(cv), 1);
4478 CvSTART(cv) = LINKLIST(CvROOT(cv));
4479 CvROOT(cv)->op_next = 0;
a2efc822 4480 CALL_PEEP(CvSTART(cv));
7766f137
GS		 4481
4482 /* now that optimizer has done its work, adjust pad values */
54310121 4483
dd2155a4
DM		 4484 pad_tidy(CvCLONE(cv) ? padtidy_SUBCLONE : padtidy_SUB);
4485
4486 if (CvCLONE(cv)) {
beab0874
JT		 4487 assert(!CvCONST(cv));
4488 if (ps && !*ps && op_const_sv(block, cv))
4489 CvCONST_on(cv);
a0d0e21e 4490 }
79072805 4491
83ee9e09 4492 if (name || aname) {
6867be6d
AL		 4493 const char *s;
4494 const char *tname = (name ? name : aname);
44a8e56a 4495
3280af22 4496 if (PERLDB_SUBLINE && PL_curstash != PL_debstash) {
46fc3d4c 4497 SV *sv = NEWSV(0,0);
44a8e56a 4498 SV *tmpstr = sv_newmortal();
549bb64a 4499 GV *db_postponed = gv_fetchpv("DB::postponed", GV_ADDMULTI, SVt_PVHV);
83ee9e09 4500 CV *pcv;
44a8e56a 4501 HV *hv;
4502
ed094faf
GS		 4503 Perl_sv_setpvf(aTHX_ sv, "%s:%ld-%ld",
4504 CopFILE(PL_curcop),
cc49e20b 4505 (long)PL_subline, (long)CopLINE(PL_curcop));
44a8e56a 4506 gv_efullname3(tmpstr, gv, Nullch);
b15aece3 4507 hv_store(GvHV(PL_DBsub), SvPVX_const(tmpstr), SvCUR(tmpstr), sv, 0);
44a8e56a 4508 hv = GvHVn(db_postponed);
b15aece3 4509 if (HvFILL(hv) > 0 && hv_exists(hv, SvPVX_const(tmpstr), SvCUR(tmpstr))
83ee9e09
GS		 4510 && (pcv = GvCV(db_postponed)))
4511 {
44a8e56a 4512 dSP;
924508f0 4513 PUSHMARK(SP);
44a8e56a 4514 XPUSHs(tmpstr);
4515 PUTBACK;
83ee9e09 4516 call_sv((SV*)pcv, G_DISCARD);
44a8e56a 4517 }
4518 }
79072805 4519
83ee9e09 4520 if ((s = strrchr(tname,':')))
28757baa 4521 s++;
4522 else
83ee9e09 4523 s = tname;
ed094faf 4524
7d30b5c4 4525 if (*s != 'B' && *s != 'E' && *s != 'C' && *s != 'I')
ed094faf
GS		 4526 goto done;
4527
7678c486 4528 if (strEQ(s, "BEGIN") && !PL_error_count) {
6867be6d 4529 const I32 oldscope = PL_scopestack_ix;
28757baa 4530 ENTER;
57843af0
GS		 4531 SAVECOPFILE(&PL_compiling);
4532 SAVECOPLINE(&PL_compiling);
28757baa 4533
3280af22
NIS		 4534 if (!PL_beginav)
4535 PL_beginav = newAV();
28757baa 4536 DEBUG_x( dump_sub(gv) );
ea2f84a3
GS		 4537 av_push(PL_beginav, (SV*)cv);
4538 GvCV(gv) = 0; /* cv has been hijacked */
3280af22 4539 call_list(oldscope, PL_beginav);
a6006777 4540
3280af22 4541 PL_curcop = &PL_compiling;
eb160463 4542 PL_compiling.op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
28757baa 4543 LEAVE;
4544 }
3280af22
NIS		 4545 else if (strEQ(s, "END") && !PL_error_count) {
4546 if (!PL_endav)
4547 PL_endav = newAV();
ed094faf 4548 DEBUG_x( dump_sub(gv) );
3280af22 4549 av_unshift(PL_endav, 1);
ea2f84a3
GS		 4550 av_store(PL_endav, 0, (SV*)cv);
4551 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 4552 }
7d30b5c4
GS		 4553 else if (strEQ(s, "CHECK") && !PL_error_count) {
4554 if (!PL_checkav)
4555 PL_checkav = newAV();
ed094faf 4556 DEBUG_x( dump_sub(gv) );
ddda08b7 4557 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 4558 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run CHECK block");
7d30b5c4 4559 av_unshift(PL_checkav, 1);
ea2f84a3
GS		 4560 av_store(PL_checkav, 0, (SV*)cv);
4561 GvCV(gv) = 0; /* cv has been hijacked */
4f25aa18 4562 }
3280af22
NIS		 4563 else if (strEQ(s, "INIT") && !PL_error_count) {
4564 if (!PL_initav)
4565 PL_initav = newAV();
ed094faf 4566 DEBUG_x( dump_sub(gv) );
ddda08b7 4567 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 4568 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run INIT block");
ea2f84a3
GS		 4569 av_push(PL_initav, (SV*)cv);
4570 GvCV(gv) = 0; /* cv has been hijacked */
ae77835f 4571 }
79072805 4572 }
a6006777 4573
aa689395 4574 done:
3280af22 4575 PL_copline = NOLINE;
8990e307 4576 LEAVE_SCOPE(floor);
a0d0e21e 4577 return cv;
79072805
LW		 4578}
4579
b099ddc0 4580/* XXX unsafe for threads if eval_owner isn't held */
954c1994
GS		 4581/*
4582=for apidoc newCONSTSUB
4583
4584Creates a constant sub equivalent to Perl C<sub FOO () { 123 }> which is
4585eligible for inlining at compile-time.
4586
4587=cut
4588*/
4589
beab0874 4590CV *
e1ec3a88 4591Perl_newCONSTSUB(pTHX_ HV *stash, const char *name, SV *sv)
5476c433 4592{
27da23d5 4593 dVAR;
beab0874 4594 CV* cv;
5476c433 4595
11faa288 4596 ENTER;
11faa288 4597
f4dd75d9 4598 SAVECOPLINE(PL_curcop);
11faa288 4599 CopLINE_set(PL_curcop, PL_copline);
f4dd75d9
GS		 4600
4601 SAVEHINTS();
3280af22 4602 PL_hints &= ~HINT_BLOCK_SCOPE;
11faa288
GS		 4603
4604 if (stash) {
4605 SAVESPTR(PL_curstash);
4606 SAVECOPSTASH(PL_curcop);
4607 PL_curstash = stash;
05ec9bb3 4608 CopSTASH_set(PL_curcop,stash);
11faa288 4609 }
5476c433 4610
91a15d0d 4611 cv = newXS(name, const_sv_xsub, savepv(CopFILE(PL_curcop)));
beab0874
JT		 4612 CvXSUBANY(cv).any_ptr = sv;
4613 CvCONST_on(cv);
c69006e4 4614 sv_setpvn((SV*)cv, "", 0); /* prototype is "" */
5476c433 4615
02f28d44
MHM		 4616 if (stash)
4617 CopSTASH_free(PL_curcop);
4618
11faa288 4619 LEAVE;
beab0874
JT		 4620
4621 return cv;
5476c433
JD		 4622}
4623
954c1994
GS		 4624/*
4625=for apidoc U||newXS
4626
4627Used by C<xsubpp> to hook up XSUBs as Perl subs.
4628
4629=cut
4630*/
4631
57d3b86d 4632CV *
bfed75c6 4633Perl_newXS(pTHX_ const char *name, XSUBADDR_t subaddr, const char *filename)
a0d0e21e 4634{
9a957fbc 4635 GV * const gv = gv_fetchpv(name ? name :
c99da370
JH		 4636 (PL_curstash ? "__ANON__" : "__ANON__::__ANON__"),
4637 GV_ADDMULTI, SVt_PVCV);
79072805 4638 register CV *cv;
44a8e56a 4639
1ecdd9a8
HS		 4640 if (!subaddr)
4641 Perl_croak(aTHX_ "panic: no address for '%s' in '%s'", name, filename);
4642
155aba94 4643 if ((cv = (name ? GvCV(gv) : Nullcv))) {
44a8e56a 4644 if (GvCVGEN(gv)) {
4645 /* just a cached method */
4646 SvREFCNT_dec(cv);
66a1b24b 4647 cv = Nullcv;
44a8e56a 4648 }
4649 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
4650 /* already defined (or promised) */
1df70142 4651 /* XXX It's possible for this HvNAME_get to return null, and get passed into strEQ */
66a1b24b
AL		 4652 if (ckWARN(WARN_REDEFINE)) {
4653 GV * const gvcv = CvGV(cv);
4654 if (gvcv) {
4655 HV * const stash = GvSTASH(gvcv);
4656 if (stash) {
4657 const char *name = HvNAME_get(stash);
4658 if ( strEQ(name,"autouse") ) {
4659 const line_t oldline = CopLINE(PL_curcop);
4660 if (PL_copline != NOLINE)
4661 CopLINE_set(PL_curcop, PL_copline);
4662 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
4663 CvCONST(cv) ? "Constant subroutine %s redefined"
4664 : "Subroutine %s redefined"
4665 ,name);
4666 CopLINE_set(PL_curcop, oldline);
4667 }
4668 }
4669 }
a0d0e21e
LW		 4670 }
4671 SvREFCNT_dec(cv);
66a1b24b 4672 cv = Nullcv;
79072805 4673 }
79072805 4674 }
44a8e56a 4675
4676 if (cv) /* must reuse cv if autoloaded */
4677 cv_undef(cv);
a0d0e21e
LW		 4678 else {
4679 cv = (CV*)NEWSV(1105,0);
4680 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 4681 if (name) {
4682 GvCV(gv) = cv;
4683 GvCVGEN(gv) = 0;
3280af22 4684 PL_sub_generation++;
44a8e56a 4685 }
a0d0e21e 4686 }
65c50114 4687 CvGV(cv) = gv;
b195d487 4688 (void)gv_fetchfile(filename);
dd374669 4689 CvFILE(cv) = (char *)filename; /* NOTE: not copied, as it is expected to be
57843af0 4690 an external constant string */
a0d0e21e 4691 CvXSUB(cv) = subaddr;
44a8e56a 4692
28757baa 4693 if (name) {
e1ec3a88 4694 const char *s = strrchr(name,':');
28757baa 4695 if (s)
4696 s++;
4697 else
4698 s = name;
ed094faf 4699
7d30b5c4 4700 if (*s != 'B' && *s != 'E' && *s != 'C' && *s != 'I')
ed094faf
GS		 4701 goto done;
4702
28757baa 4703 if (strEQ(s, "BEGIN")) {
3280af22
NIS		 4704 if (!PL_beginav)
4705 PL_beginav = newAV();
ea2f84a3
GS		 4706 av_push(PL_beginav, (SV*)cv);
4707 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 4708 }
4709 else if (strEQ(s, "END")) {
3280af22
NIS		 4710 if (!PL_endav)
4711 PL_endav = newAV();
4712 av_unshift(PL_endav, 1);
ea2f84a3
GS		 4713 av_store(PL_endav, 0, (SV*)cv);
4714 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 4715 }
7d30b5c4
GS		 4716 else if (strEQ(s, "CHECK")) {
4717 if (!PL_checkav)
4718 PL_checkav = newAV();
ddda08b7 4719 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 4720 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run CHECK block");
7d30b5c4 4721 av_unshift(PL_checkav, 1);
ea2f84a3
GS		 4722 av_store(PL_checkav, 0, (SV*)cv);
4723 GvCV(gv) = 0; /* cv has been hijacked */
4f25aa18 4724 }
7d07dbc2 4725 else if (strEQ(s, "INIT")) {
3280af22
NIS		 4726 if (!PL_initav)
4727 PL_initav = newAV();
ddda08b7 4728 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 4729 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run INIT block");
ea2f84a3
GS		 4730 av_push(PL_initav, (SV*)cv);
4731 GvCV(gv) = 0; /* cv has been hijacked */
ae77835f 4732 }
28757baa 4733 }
8990e307 4734 else
a5f75d66 4735 CvANON_on(cv);
44a8e56a 4736
ed094faf 4737done:
a0d0e21e 4738 return cv;
79072805
LW		 4739}
4740
4741void
864dbfa3 4742Perl_newFORM(pTHX_ I32 floor, OP *o, OP *block)
79072805
LW		 4743{
4744 register CV *cv;
79072805 4745 GV *gv;
79072805 4746
11343788 4747 if (o)
7a5fd60d 4748 gv = gv_fetchsv(cSVOPo->op_sv, TRUE, SVt_PVFM);
79072805 4749 else
7a5fd60d
NC		 4750 gv = gv_fetchpv("STDOUT", TRUE, SVt_PVFM);
4751
7fb37951
AMS		 4752#ifdef GV_UNIQUE_CHECK
4753 if (GvUNIQUE(gv)) {
4754 Perl_croak(aTHX_ "Bad symbol for form (GV is unique)");
5bd07a3d
DM		 4755 }
4756#endif
a5f75d66 4757 GvMULTI_on(gv);
155aba94 4758 if ((cv = GvFORM(gv))) {
599cee73 4759 if (ckWARN(WARN_REDEFINE)) {
6867be6d 4760 const line_t oldline = CopLINE(PL_curcop);
d8a34499
IK		 4761 if (PL_copline != NOLINE)
4762 CopLINE_set(PL_curcop, PL_copline);
7a5fd60d
NC		 4763 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
4764 o ? "Format %"SVf" redefined"
4765 : "Format STDOUT redefined" ,cSVOPo->op_sv);
57843af0 4766 CopLINE_set(PL_curcop, oldline);
79072805 4767 }
8990e307 4768 SvREFCNT_dec(cv);
79072805 4769 }
3280af22 4770 cv = PL_compcv;
79072805 4771 GvFORM(gv) = cv;
65c50114 4772 CvGV(cv) = gv;
a636914a 4773 CvFILE_set_from_cop(cv, PL_curcop);
79072805 4774
a0d0e21e 4775
dd2155a4 4776 pad_tidy(padtidy_FORMAT);
79072805 4777 CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
7934575e
GS		 4778 CvROOT(cv)->op_private |= OPpREFCOUNTED;
4779 OpREFCNT_set(CvROOT(cv), 1);
79072805
LW		 4780 CvSTART(cv) = LINKLIST(CvROOT(cv));
4781 CvROOT(cv)->op_next = 0;
a2efc822 4782 CALL_PEEP(CvSTART(cv));
11343788 4783 op_free(o);
3280af22 4784 PL_copline = NOLINE;
8990e307 4785 LEAVE_SCOPE(floor);
79072805
LW		 4786}
4787
4788OP *
864dbfa3 4789Perl_newANONLIST(pTHX_ OP *o)
79072805 4790{
93a17b20 4791 return newUNOP(OP_REFGEN, 0,
11343788 4792 mod(list(convert(OP_ANONLIST, 0, o)), OP_REFGEN));
79072805
LW		 4793}
4794
4795OP *
864dbfa3 4796Perl_newANONHASH(pTHX_ OP *o)
79072805 4797{
93a17b20 4798 return newUNOP(OP_REFGEN, 0,
11343788 4799 mod(list(convert(OP_ANONHASH, 0, o)), OP_REFGEN));
a0d0e21e
LW		 4800}
4801
4802OP *
864dbfa3 4803Perl_newANONSUB(pTHX_ I32 floor, OP *proto, OP *block)
a0d0e21e 4804{
09bef843
SB		 4805 return newANONATTRSUB(floor, proto, Nullop, block);
4806}
4807
4808OP *
4809Perl_newANONATTRSUB(pTHX_ I32 floor, OP *proto, OP *attrs, OP *block)
4810{
a0d0e21e 4811 return newUNOP(OP_REFGEN, 0,
09bef843
SB		 4812 newSVOP(OP_ANONCODE, 0,
4813 (SV*)newATTRSUB(floor, 0, proto, attrs, block)));
79072805
LW		 4814}
4815
4816OP *
864dbfa3 4817Perl_oopsAV(pTHX_ OP *o)
79072805 4818{
27da23d5 4819 dVAR;
ed6116ce
LW		 4820 switch (o->op_type) {
4821 case OP_PADSV:
4822 o->op_type = OP_PADAV;
22c35a8c 4823 o->op_ppaddr = PL_ppaddr[OP_PADAV];
51e247a3 4824 return ref(o, OP_RV2AV);
b2ffa427 4825
ed6116ce 4826 case OP_RV2SV:
79072805 4827 o->op_type = OP_RV2AV;
22c35a8c 4828 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
79072805 4829 ref(o, OP_RV2AV);
ed6116ce
LW		 4830 break;
4831
4832 default:
0453d815 4833 if (ckWARN_d(WARN_INTERNAL))
9014280d 4834 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "oops: oopsAV");
ed6116ce
LW		 4835 break;
4836 }
79072805
LW		 4837 return o;
4838}
4839
4840OP *
864dbfa3 4841Perl_oopsHV(pTHX_ OP *o)
79072805 4842{
27da23d5 4843 dVAR;
ed6116ce
LW		 4844 switch (o->op_type) {
4845 case OP_PADSV:
4846 case OP_PADAV:
4847 o->op_type = OP_PADHV;
22c35a8c 4848 o->op_ppaddr = PL_ppaddr[OP_PADHV];
51e247a3 4849 return ref(o, OP_RV2HV);
ed6116ce
LW		 4850
4851 case OP_RV2SV:
4852 case OP_RV2AV:
79072805 4853 o->op_type = OP_RV2HV;
22c35a8c 4854 o->op_ppaddr = PL_ppaddr[OP_RV2HV];
79072805 4855 ref(o, OP_RV2HV);
ed6116ce
LW		 4856 break;
4857
4858 default:
0453d815 4859 if (ckWARN_d(WARN_INTERNAL))
9014280d 4860 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "oops: oopsHV");
ed6116ce
LW		 4861 break;
4862 }
79072805
LW		 4863 return o;
4864}
4865
4866OP *
864dbfa3 4867Perl_newAVREF(pTHX_ OP *o)
79072805 4868{
27da23d5 4869 dVAR;
ed6116ce
LW		 4870 if (o->op_type == OP_PADANY) {
4871 o->op_type = OP_PADAV;
22c35a8c 4872 o->op_ppaddr = PL_ppaddr[OP_PADAV];
93a17b20 4873 return o;
ed6116ce 4874 }
a1063b2d 4875 else if ((o->op_type == OP_RV2AV || o->op_type == OP_PADAV)
9014280d
PM		 4876 && ckWARN(WARN_DEPRECATED)) {
4877 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
a1063b2d
RH		 4878 "Using an array as a reference is deprecated");
4879 }
79072805
LW		 4880 return newUNOP(OP_RV2AV, 0, scalar(o));
4881}
4882
4883OP *
864dbfa3 4884Perl_newGVREF(pTHX_ I32 type, OP *o)
79072805 4885{
82092f1d 4886 if (type == OP_MAPSTART || type == OP_GREPSTART || type == OP_SORT)
a0d0e21e 4887 return newUNOP(OP_NULL, 0, o);
748a9306 4888 return ref(newUNOP(OP_RV2GV, OPf_REF, o), type);
79072805
LW		 4889}
4890
4891OP *
864dbfa3 4892Perl_newHVREF(pTHX_ OP *o)
79072805 4893{
27da23d5 4894 dVAR;
ed6116ce
LW		 4895 if (o->op_type == OP_PADANY) {
4896 o->op_type = OP_PADHV;
22c35a8c 4897 o->op_ppaddr = PL_ppaddr[OP_PADHV];
93a17b20 4898 return o;
ed6116ce 4899 }
a1063b2d 4900 else if ((o->op_type == OP_RV2HV || o->op_type == OP_PADHV)
9014280d
PM		 4901 && ckWARN(WARN_DEPRECATED)) {
4902 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
a1063b2d
RH		 4903 "Using a hash as a reference is deprecated");
4904 }
79072805
LW		 4905 return newUNOP(OP_RV2HV, 0, scalar(o));
4906}
4907
4908OP *
864dbfa3 4909Perl_oopsCV(pTHX_ OP *o)
79072805 4910{
cea2e8a9 4911 Perl_croak(aTHX_ "NOT IMPL LINE %d",__LINE__);
79072805 4912 /* STUB */
46c461b5 4913 PERL_UNUSED_ARG(o);
0dbb1585 4914 NORETURN_FUNCTION_END;
79072805
LW		 4915}
4916
4917OP *
864dbfa3 4918Perl_newCVREF(pTHX_ I32 flags, OP *o)
79072805 4919{
c07a80fd 4920 return newUNOP(OP_RV2CV, flags, scalar(o));
79072805
LW		 4921}
4922
4923OP *
864dbfa3 4924Perl_newSVREF(pTHX_ OP *o)
79072805 4925{
27da23d5 4926 dVAR;
ed6116ce
LW		 4927 if (o->op_type == OP_PADANY) {
4928 o->op_type = OP_PADSV;
22c35a8c 4929 o->op_ppaddr = PL_ppaddr[OP_PADSV];
93a17b20 4930 return o;
ed6116ce 4931 }
224a4551
MB		 4932 else if (o->op_type == OP_THREADSV && !(o->op_flags & OPpDONE_SVREF)) {
4933 o->op_flags |= OPpDONE_SVREF;
a863c7d1 4934 return o;
224a4551 4935 }
79072805
LW		 4936 return newUNOP(OP_RV2SV, 0, scalar(o));
4937}
4938
61b743bb
DM		 4939/* Check routines. See the comments at the top of this file for details
4940 * on when these are called */
79072805
LW		 4941
4942OP *
cea2e8a9 4943Perl_ck_anoncode(pTHX_ OP *o)
5f05dabc 4944{
dd2155a4 4945 cSVOPo->op_targ = pad_add_anon(cSVOPo->op_sv, o->op_type);
5dc0d613 4946 cSVOPo->op_sv = Nullsv;
5dc0d613 4947 return o;
5f05dabc 4948}
4949
4950OP *
cea2e8a9 4951Perl_ck_bitop(pTHX_ OP *o)
55497cff 4952{
276b2a0c
RGS		 4953#define OP_IS_NUMCOMPARE(op) \
4954 ((op) == OP_LT || (op) == OP_I_LT || \
4955 (op) == OP_GT || (op) == OP_I_GT || \
4956 (op) == OP_LE || (op) == OP_I_LE || \
4957 (op) == OP_GE || (op) == OP_I_GE || \
4958 (op) == OP_EQ || (op) == OP_I_EQ || \
4959 (op) == OP_NE || (op) == OP_I_NE || \
4960 (op) == OP_NCMP || (op) == OP_I_NCMP)
eb160463 4961 o->op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
2b84528b
RGS		 4962 if (!(o->op_flags & OPf_STACKED) /* Not an assignment */
4963 && (o->op_type == OP_BIT_OR
4964 || o->op_type == OP_BIT_AND
4965 || o->op_type == OP_BIT_XOR))
276b2a0c 4966 {
1df70142
AL		 4967 const OP * const left = cBINOPo->op_first;
4968 const OP * const right = left->op_sibling;
96a925ab
YST		 4969 if ((OP_IS_NUMCOMPARE(left->op_type) &&
4970 (left->op_flags & OPf_PARENS) == 0) ||
4971 (OP_IS_NUMCOMPARE(right->op_type) &&
4972 (right->op_flags & OPf_PARENS) == 0))
276b2a0c
RGS		 4973 if (ckWARN(WARN_PRECEDENCE))
4974 Perl_warner(aTHX_ packWARN(WARN_PRECEDENCE),
4975 "Possible precedence problem on bitwise %c operator",
4976 o->op_type == OP_BIT_OR ? '|'
4977 : o->op_type == OP_BIT_AND ? '&' : '^'
4978 );
4979 }
5dc0d613 4980 return o;
55497cff 4981}
4982
4983OP *
cea2e8a9 4984Perl_ck_concat(pTHX_ OP *o)
79072805 4985{
6867be6d 4986 const OP *kid = cUNOPo->op_first;
df91b2c5
AE		 4987 if (kid->op_type == OP_CONCAT && !(kid->op_private & OPpTARGET_MY) &&
4988 !(kUNOP->op_first->op_flags & OPf_MOD))
0165acc7 4989 o->op_flags |= OPf_STACKED;
11343788 4990 return o;
79072805
LW		 4991}
4992
4993OP *
cea2e8a9 4994Perl_ck_spair(pTHX_ OP *o)
79072805 4995{
27da23d5 4996 dVAR;
11343788 4997 if (o->op_flags & OPf_KIDS) {
79072805 4998 OP* newop;
a0d0e21e 4999 OP* kid;
6867be6d 5000 const OPCODE type = o->op_type;
5dc0d613 5001 o = modkids(ck_fun(o), type);
11343788 5002 kid = cUNOPo->op_first;
a0d0e21e
LW		 5003 newop = kUNOP->op_first->op_sibling;
5004 if (newop &&
5005 (newop->op_sibling ||
22c35a8c 5006 !(PL_opargs[newop->op_type] & OA_RETSCALAR) ||
a0d0e21e
LW		 5007 newop->op_type == OP_PADAV || newop->op_type == OP_PADHV ||
5008 newop->op_type == OP_RV2AV || newop->op_type == OP_RV2HV)) {
b2ffa427 5009
11343788 5010 return o;
a0d0e21e
LW		 5011 }
5012 op_free(kUNOP->op_first);
5013 kUNOP->op_first = newop;
5014 }
22c35a8c 5015 o->op_ppaddr = PL_ppaddr[++o->op_type];
11343788 5016 return ck_fun(o);
a0d0e21e
LW		 5017}
5018
5019OP *
cea2e8a9 5020Perl_ck_delete(pTHX_ OP *o)
a0d0e21e 5021{
11343788 5022 o = ck_fun(o);
5dc0d613 5023 o->op_private = 0;
11343788
MB		 5024 if (o->op_flags & OPf_KIDS) {
5025 OP *kid = cUNOPo->op_first;
01020589
GS		 5026 switch (kid->op_type) {
5027 case OP_ASLICE:
5028 o->op_flags |= OPf_SPECIAL;
5029 /* FALL THROUGH */
5030 case OP_HSLICE:
5dc0d613 5031 o->op_private |= OPpSLICE;
01020589
GS		 5032 break;
5033 case OP_AELEM:
5034 o->op_flags |= OPf_SPECIAL;
5035 /* FALL THROUGH */
5036 case OP_HELEM:
5037 break;
5038 default:
5039 Perl_croak(aTHX_ "%s argument is not a HASH or ARRAY element or slice",
53e06cf0 5040 OP_DESC(o));
01020589 5041 }
93c66552 5042 op_null(kid);
79072805 5043 }
11343788 5044 return o;
79072805
LW		 5045}
5046
5047OP *
96e176bf
CL		 5048Perl_ck_die(pTHX_ OP *o)
5049{
5050#ifdef VMS
5051 if (VMSISH_HUSHED) o->op_private |= OPpHUSH_VMSISH;
5052#endif
5053 return ck_fun(o);
5054}
5055
5056OP *
cea2e8a9 5057Perl_ck_eof(pTHX_ OP *o)
79072805 5058{
6867be6d 5059 const I32 type = o->op_type;
79072805 5060
11343788
MB		 5061 if (o->op_flags & OPf_KIDS) {
5062 if (cLISTOPo->op_first->op_type == OP_STUB) {
5063 op_free(o);
8fde6460 5064 o = newUNOP(type, OPf_SPECIAL, newGVOP(OP_GV, 0, PL_argvgv));
8990e307 5065 }
11343788 5066 return ck_fun(o);
79072805 5067 }
11343788 5068 return o;
79072805
LW		 5069}
5070
5071OP *
cea2e8a9 5072Perl_ck_eval(pTHX_ OP *o)
79072805 5073{
27da23d5 5074 dVAR;
3280af22 5075 PL_hints |= HINT_BLOCK_SCOPE;
11343788 5076 if (o->op_flags & OPf_KIDS) {
46c461b5 5077 SVOP * const kid = (SVOP*)cUNOPo->op_first;
79072805 5078
93a17b20 5079 if (!kid) {
11343788 5080 o->op_flags &= ~OPf_KIDS;
93c66552 5081 op_null(o);
79072805 5082 }
b14574b4 5083 else if (kid->op_type == OP_LINESEQ || kid->op_type == OP_STUB) {
79072805
LW		 5084 LOGOP *enter;
5085
11343788
MB		 5086 cUNOPo->op_first = 0;
5087 op_free(o);
79072805 5088
b7dc083c 5089 NewOp(1101, enter, 1, LOGOP);
79072805 5090 enter->op_type = OP_ENTERTRY;
22c35a8c 5091 enter->op_ppaddr = PL_ppaddr[OP_ENTERTRY];
79072805
LW		 5092 enter->op_private = 0;
5093
5094 /* establish postfix order */
5095 enter->op_next = (OP*)enter;
5096
11343788
MB		 5097 o = prepend_elem(OP_LINESEQ, (OP*)enter, (OP*)kid);
5098 o->op_type = OP_LEAVETRY;
22c35a8c 5099 o->op_ppaddr = PL_ppaddr[OP_LEAVETRY];
11343788
MB		 5100 enter->op_other = o;
5101 return o;
79072805 5102 }
b5c19bd7 5103 else {
473986ff 5104 scalar((OP*)kid);
b5c19bd7
DM		 5105 PL_cv_has_eval = 1;
5106 }
79072805
LW		 5107 }
5108 else {
11343788 5109 op_free(o);
54b9620d 5110 o = newUNOP(OP_ENTEREVAL, 0, newDEFSVOP());
79072805 5111 }
3280af22 5112 o->op_targ = (PADOFFSET)PL_hints;
11343788 5113 return o;
79072805
LW		 5114}
5115
5116OP *
d98f61e7
GS		 5117Perl_ck_exit(pTHX_ OP *o)
5118{
5119#ifdef VMS
5120 HV *table = GvHV(PL_hintgv);
5121 if (table) {
5122 SV **svp = hv_fetch(table, "vmsish_exit", 11, FALSE);
5123 if (svp && *svp && SvTRUE(*svp))
5124 o->op_private |= OPpEXIT_VMSISH;
5125 }
96e176bf 5126 if (VMSISH_HUSHED) o->op_private |= OPpHUSH_VMSISH;
d98f61e7
GS		 5127#endif
5128 return ck_fun(o);
5129}
5130
5131OP *
cea2e8a9 5132Perl_ck_exec(pTHX_ OP *o)
79072805 5133{
11343788 5134 if (o->op_flags & OPf_STACKED) {
6867be6d 5135 OP *kid;
11343788
MB		 5136 o = ck_fun(o);
5137 kid = cUNOPo->op_first->op_sibling;
8990e307 5138 if (kid->op_type == OP_RV2GV)
93c66552 5139 op_null(kid);
79072805 5140 }
463ee0b2 5141 else
11343788
MB		 5142 o = listkids(o);
5143 return o;
79072805
LW		 5144}
5145
5146OP *
cea2e8a9 5147Perl_ck_exists(pTHX_ OP *o)
5f05dabc 5148{
5196be3e
MB		 5149 o = ck_fun(o);
5150 if (o->op_flags & OPf_KIDS) {
46c461b5 5151 OP * const kid = cUNOPo->op_first;
afebc493
GS		 5152 if (kid->op_type == OP_ENTERSUB) {
5153 (void) ref(kid, o->op_type);
5154 if (kid->op_type != OP_RV2CV && !PL_error_count)
5155 Perl_croak(aTHX_ "%s argument is not a subroutine name",
53e06cf0 5156 OP_DESC(o));
afebc493
GS		 5157 o->op_private |= OPpEXISTS_SUB;
5158 }
5159 else if (kid->op_type == OP_AELEM)
01020589
GS		 5160 o->op_flags |= OPf_SPECIAL;
5161 else if (kid->op_type != OP_HELEM)
5162 Perl_croak(aTHX_ "%s argument is not a HASH or ARRAY element",
53e06cf0 5163 OP_DESC(o));
93c66552 5164 op_null(kid);
5f05dabc 5165 }
5196be3e 5166 return o;
5f05dabc 5167}
5168
79072805 5169OP *
cea2e8a9 5170Perl_ck_rvconst(pTHX_ register OP *o)
79072805 5171{
27da23d5 5172 dVAR;
11343788 5173 SVOP *kid = (SVOP*)cUNOPo->op_first;
85e6fe83 5174
3280af22 5175 o->op_private |= (PL_hints & HINT_STRICT_REFS);
79072805 5176 if (kid->op_type == OP_CONST) {
44a8e56a 5177 int iscv;
5178 GV *gv;
504618e9 5179 SV * const kidsv = kid->op_sv;
44a8e56a 5180
779c5bc9
GS		 5181 /* Is it a constant from cv_const_sv()? */
5182 if (SvROK(kidsv) && SvREADONLY(kidsv)) {
5183 SV *rsv = SvRV(kidsv);
504618e9 5184 const int svtype = SvTYPE(rsv);
e1ec3a88 5185 const char *badtype = Nullch;
779c5bc9
GS		 5186
5187 switch (o->op_type) {
5188 case OP_RV2SV:
5189 if (svtype > SVt_PVMG)
5190 badtype = "a SCALAR";
5191 break;
5192 case OP_RV2AV:
5193 if (svtype != SVt_PVAV)
5194 badtype = "an ARRAY";
5195 break;
5196 case OP_RV2HV:
6d822dc4 5197 if (svtype != SVt_PVHV)
779c5bc9 5198 badtype = "a HASH";
779c5bc9
GS		 5199 break;
5200 case OP_RV2CV:
5201 if (svtype != SVt_PVCV)
5202 badtype = "a CODE";
5203 break;
5204 }
5205 if (badtype)
cea2e8a9 5206 Perl_croak(aTHX_ "Constant is not %s reference", badtype);
779c5bc9
GS		 5207 return o;
5208 }
3280af22 5209 if ((PL_hints & HINT_STRICT_REFS) && (kid->op_private & OPpCONST_BARE)) {
e1ec3a88 5210 const char *badthing = Nullch;
5dc0d613 5211 switch (o->op_type) {
44a8e56a 5212 case OP_RV2SV:
5213 badthing = "a SCALAR";
5214 break;
5215 case OP_RV2AV:
5216 badthing = "an ARRAY";
5217 break;
5218 case OP_RV2HV:
5219 badthing = "a HASH";
5220 break;
5221 }
5222 if (badthing)
1c846c1f 5223 Perl_croak(aTHX_
7a5fd60d
NC		 5224 "Can't use bareword (\"%"SVf"\") as %s ref while \"strict refs\" in use",
5225 kidsv, badthing);
44a8e56a 5226 }
93233ece
CS		 5227 /*
5228 * This is a little tricky. We only want to add the symbol if we
5229 * didn't add it in the lexer. Otherwise we get duplicate strict
5230 * warnings. But if we didn't add it in the lexer, we must at
5231 * least pretend like we wanted to add it even if it existed before,
5232 * or we get possible typo warnings. OPpCONST_ENTERED says
5233 * whether the lexer already added THIS instance of this symbol.
5234 */
5196be3e 5235 iscv = (o->op_type == OP_RV2CV) * 2;
93233ece 5236 do {
7a5fd60d 5237 gv = gv_fetchsv(kidsv,
748a9306 5238 iscv | !(kid->op_private & OPpCONST_ENTERED),
a0d0e21e
LW		 5239 iscv
5240 ? SVt_PVCV
11343788 5241 : o->op_type == OP_RV2SV
a0d0e21e 5242 ? SVt_PV
11343788 5243 : o->op_type == OP_RV2AV
a0d0e21e 5244 ? SVt_PVAV
11343788 5245 : o->op_type == OP_RV2HV
a0d0e21e
LW		 5246 ? SVt_PVHV
5247 : SVt_PVGV);
93233ece
CS		 5248 } while (!gv && !(kid->op_private & OPpCONST_ENTERED) && !iscv++);
5249 if (gv) {
5250 kid->op_type = OP_GV;
5251 SvREFCNT_dec(kid->op_sv);
350de78d 5252#ifdef USE_ITHREADS
638eceb6 5253 /* XXX hack: dependence on sizeof(PADOP) <= sizeof(SVOP) */
350de78d 5254 kPADOP->op_padix = pad_alloc(OP_GV, SVs_PADTMP);
dd2155a4 5255 SvREFCNT_dec(PAD_SVl(kPADOP->op_padix));
743e66e6 5256 GvIN_PAD_on(gv);
dd2155a4 5257 PAD_SETSV(kPADOP->op_padix, (SV*) SvREFCNT_inc(gv));
350de78d 5258#else
93233ece 5259 kid->op_sv = SvREFCNT_inc(gv);
350de78d 5260#endif
23f1ca44 5261 kid->op_private = 0;
76cd736e 5262 kid->op_ppaddr = PL_ppaddr[OP_GV];
a0d0e21e 5263 }
79072805 5264 }
11343788 5265 return o;
79072805
LW		 5266}
5267
5268OP *
cea2e8a9 5269Perl_ck_ftst(pTHX_ OP *o)
79072805 5270{
27da23d5 5271 dVAR;
6867be6d 5272 const I32 type = o->op_type;
79072805 5273
d0dca557
JD		 5274 if (o->op_flags & OPf_REF) {
5275 /* nothing */
5276 }
5277 else if (o->op_flags & OPf_KIDS && cUNOPo->op_first->op_type != OP_STUB) {
11343788 5278 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805
LW		 5279
5280 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
a0d0e21e 5281 OP *newop = newGVOP(type, OPf_REF,
7a5fd60d 5282 gv_fetchsv(kid->op_sv, TRUE, SVt_PVIO));
11343788 5283 op_free(o);
d0dca557 5284 o = newop;
181bc48d 5285 return o;
79072805 5286 }
1af34c76
JH		 5287 else {
5288 if ((PL_hints & HINT_FILETEST_ACCESS) &&
5289 OP_IS_FILETEST_ACCESS(o))
5290 o->op_private |= OPpFT_ACCESS;
5291 }
fbb0b3b3
RGS		 5292 if (PL_check[kid->op_type] == MEMBER_TO_FPTR(Perl_ck_ftst)
5293 && kid->op_type != OP_STAT && kid->op_type != OP_LSTAT)
5294 o->op_private |= OPpFT_STACKED;
79072805
LW		 5295 }
5296 else {
11343788 5297 op_free(o);
79072805 5298 if (type == OP_FTTTY)
8fde6460 5299 o = newGVOP(type, OPf_REF, PL_stdingv);
79072805 5300 else
d0dca557 5301 o = newUNOP(type, 0, newDEFSVOP());
79072805 5302 }
11343788 5303 return o;
79072805
LW		 5304}
5305
5306OP *
cea2e8a9 5307Perl_ck_fun(pTHX_ OP *o)
79072805 5308{
6867be6d 5309 const int type = o->op_type;
22c35a8c 5310 register I32 oa = PL_opargs[type] >> OASHIFT;
aeea060c 5311
11343788 5312 if (o->op_flags & OPf_STACKED) {
79072805
LW		 5313 if ((oa & OA_OPTIONAL) && (oa >> 4) && !((oa >> 4) & OA_OPTIONAL))
5314 oa &= ~OA_OPTIONAL;
5315 else
11343788 5316 return no_fh_allowed(o);
79072805
LW		 5317 }
5318
11343788 5319 if (o->op_flags & OPf_KIDS) {
6867be6d
AL		 5320 OP **tokid = &cLISTOPo->op_first;
5321 register OP *kid = cLISTOPo->op_first;
5322 OP *sibl;
5323 I32 numargs = 0;
5324
8990e307 5325 if (kid->op_type == OP_PUSHMARK ||
155aba94 5326 (kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK))
8990e307 5327 {
79072805
LW		 5328 tokid = &kid->op_sibling;
5329 kid = kid->op_sibling;
5330 }
22c35a8c 5331 if (!kid && PL_opargs[type] & OA_DEFGV)
54b9620d 5332 *tokid = kid = newDEFSVOP();
79072805
LW		 5333
5334 while (oa && kid) {
5335 numargs++;
5336 sibl = kid->op_sibling;
5337 switch (oa & 7) {
5338 case OA_SCALAR:
62c18ce2
GS		 5339 /* list seen where single (scalar) arg expected? */
5340 if (numargs == 1 && !(oa >> 4)
5341 && kid->op_type == OP_LIST && type != OP_SCALAR)
5342 {
5343 return too_many_arguments(o,PL_op_desc[type]);
5344 }
79072805
LW		 5345 scalar(kid);
5346 break;
5347 case OA_LIST:
5348 if (oa < 16) {
5349 kid = 0;
5350 continue;
5351 }
5352 else
5353 list(kid);
5354 break;
5355 case OA_AVREF:
936edb8b 5356 if ((type == OP_PUSH || type == OP_UNSHIFT)
f87c3213 5357 && !kid->op_sibling && ckWARN(WARN_SYNTAX))
9014280d 5358 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
de4864e4 5359 "Useless use of %s with no values",
936edb8b 5360 PL_op_desc[type]);
b2ffa427 5361
79072805 5362 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5363 (kid->op_private & OPpCONST_BARE))
5364 {
79072805 5365 OP *newop = newAVREF(newGVOP(OP_GV, 0,
7a5fd60d 5366 gv_fetchsv(((SVOP*)kid)->op_sv, TRUE, SVt_PVAV) ));
12bcd1a6
PM		 5367 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
5368 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
7a5fd60d
NC		 5369 "Array @%"SVf" missing the @ in argument %"IVdf" of %s()",
5370 ((SVOP*)kid)->op_sv, (IV)numargs, PL_op_desc[type]);
79072805
LW		 5371 op_free(kid);
5372 kid = newop;
5373 kid->op_sibling = sibl;
5374 *tokid = kid;
5375 }
8990e307 5376 else if (kid->op_type != OP_RV2AV && kid->op_type != OP_PADAV)
35cd451c 5377 bad_type(numargs, "array", PL_op_desc[type], kid);
a0d0e21e 5378 mod(kid, type);
79072805
LW		 5379 break;
5380 case OA_HVREF:
5381 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5382 (kid->op_private & OPpCONST_BARE))
5383 {
79072805 5384 OP *newop = newHVREF(newGVOP(OP_GV, 0,
7a5fd60d 5385 gv_fetchsv(((SVOP*)kid)->op_sv, TRUE, SVt_PVHV) ));
12bcd1a6
PM		 5386 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
5387 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
7a5fd60d
NC		 5388 "Hash %%%"SVf" missing the %% in argument %"IVdf" of %s()",
5389 ((SVOP*)kid)->op_sv, (IV)numargs, PL_op_desc[type]);
79072805
LW		 5390 op_free(kid);
5391 kid = newop;
5392 kid->op_sibling = sibl;
5393 *tokid = kid;
5394 }
8990e307 5395 else if (kid->op_type != OP_RV2HV && kid->op_type != OP_PADHV)
35cd451c 5396 bad_type(numargs, "hash", PL_op_desc[type], kid);
a0d0e21e 5397 mod(kid, type);
79072805
LW		 5398 break;
5399 case OA_CVREF:
5400 {
a0d0e21e 5401 OP *newop = newUNOP(OP_NULL, 0, kid);
79072805
LW		 5402 kid->op_sibling = 0;
5403 linklist(kid);
5404 newop->op_next = newop;
5405 kid = newop;
5406 kid->op_sibling = sibl;
5407 *tokid = kid;
5408 }
5409 break;
5410 case OA_FILEREF:
c340be78 5411 if (kid->op_type != OP_GV && kid->op_type != OP_RV2GV) {
79072805 5412 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5413 (kid->op_private & OPpCONST_BARE))
5414 {
79072805 5415 OP *newop = newGVOP(OP_GV, 0,
7a5fd60d 5416 gv_fetchsv(((SVOP*)kid)->op_sv, TRUE, SVt_PVIO) );
afbdacea 5417 if (!(o->op_private & 1) && /* if not unop */
8a996ce8 5418 kid == cLISTOPo->op_last)
364daeac 5419 cLISTOPo->op_last = newop;
79072805
LW		 5420 op_free(kid);
5421 kid = newop;
5422 }
1ea32a52
GS		 5423 else if (kid->op_type == OP_READLINE) {
5424 /* neophyte patrol: open(<FH>), close(<FH>) etc. */
53e06cf0 5425 bad_type(numargs, "HANDLE", OP_DESC(o), kid);
1ea32a52 5426 }
79072805 5427 else {
35cd451c 5428 I32 flags = OPf_SPECIAL;
a6c40364 5429 I32 priv = 0;
2c8ac474
GS		 5430 PADOFFSET targ = 0;
5431
35cd451c 5432 /* is this op a FH constructor? */
853846ea 5433 if (is_handle_constructor(o,numargs)) {
e1ec3a88 5434 const char *name = Nullch;
dd2155a4 5435 STRLEN len = 0;
2c8ac474
GS		 5436
5437 flags = 0;
5438 /* Set a flag to tell rv2gv to vivify
853846ea
NIS		 5439 * need to "prove" flag does not mean something
5440 * else already - NI-S 1999/05/07
2c8ac474
GS		 5441 */
5442 priv = OPpDEREF;
5443 if (kid->op_type == OP_PADSV) {
dd2155a4
DM		 5444 name = PAD_COMPNAME_PV(kid->op_targ);
5445 /* SvCUR of a pad namesv can't be trusted
5446 * (see PL_generation), so calc its length
5447 * manually */
5448 if (name)
5449 len = strlen(name);
5450
2c8ac474
GS		 5451 }
5452 else if (kid->op_type == OP_RV2SV
5453 && kUNOP->op_first->op_type == OP_GV)
5454 {
5455 GV *gv = cGVOPx_gv(kUNOP->op_first);
5456 name = GvNAME(gv);
5457 len = GvNAMELEN(gv);
5458 }
afd1915d
GS		 5459 else if (kid->op_type == OP_AELEM
5460 || kid->op_type == OP_HELEM)
5461 {
0c4b0a3f
JH		 5462 OP *op;
5463
5464 name = 0;
5465 if ((op = ((BINOP*)kid)->op_first)) {
5466 SV *tmpstr = Nullsv;
e1ec3a88 5467 const char *a =
0c4b0a3f
JH		 5468 kid->op_type == OP_AELEM ?
5469 "[]" : "{}";
5470 if (((op->op_type == OP_RV2AV) ||
5471 (op->op_type == OP_RV2HV)) &&
5472 (op = ((UNOP*)op)->op_first) &&
5473 (op->op_type == OP_GV)) {
5474 /* packagevar $a[] or $h{} */
5475 GV *gv = cGVOPx_gv(op);
5476 if (gv)
5477 tmpstr =
5478 Perl_newSVpvf(aTHX_
5479 "%s%c...%c",
5480 GvNAME(gv),
5481 a[0], a[1]);
5482 }
5483 else if (op->op_type == OP_PADAV
5484 || op->op_type == OP_PADHV) {
5485 /* lexicalvar $a[] or $h{} */
6867be6d 5486 const char *padname =
0c4b0a3f
JH		 5487 PAD_COMPNAME_PV(op->op_targ);
5488 if (padname)
5489 tmpstr =
5490 Perl_newSVpvf(aTHX_
5491 "%s%c...%c",
5492 padname + 1,
5493 a[0], a[1]);
5494
5495 }
5496 if (tmpstr) {
93524f2b 5497 name = SvPV_const(tmpstr, len);
0c4b0a3f
JH		 5498 sv_2mortal(tmpstr);
5499 }
5500 }
5501 if (!name) {
5502 name = "__ANONIO__";
5503 len = 10;
5504 }
5505 mod(kid, type);
afd1915d 5506 }
2c8ac474
GS		 5507 if (name) {
5508 SV *namesv;
5509 targ = pad_alloc(OP_RV2GV, SVs_PADTMP);
dd2155a4 5510 namesv = PAD_SVl(targ);
862a34c6 5511 SvUPGRADE(namesv, SVt_PV);
2c8ac474
GS		 5512 if (*name != '$')
5513 sv_setpvn(namesv, "$", 1);
5514 sv_catpvn(namesv, name, len);
5515 }
853846ea 5516 }
79072805 5517 kid->op_sibling = 0;
35cd451c 5518 kid = newUNOP(OP_RV2GV, flags, scalar(kid));
2c8ac474
GS		 5519 kid->op_targ = targ;
5520 kid->op_private |= priv;
79072805
LW		 5521 }
5522 kid->op_sibling = sibl;
5523 *tokid = kid;
5524 }
5525 scalar(kid);
5526 break;
5527 case OA_SCALARREF:
a0d0e21e 5528 mod(scalar(kid), type);
79072805
LW		 5529 break;
5530 }
5531 oa >>= 4;
5532 tokid = &kid->op_sibling;
5533 kid = kid->op_sibling;
5534 }
11343788 5535 o->op_private |= numargs;
79072805 5536 if (kid)
53e06cf0 5537 return too_many_arguments(o,OP_DESC(o));
11343788 5538 listkids(o);
79072805 5539 }
22c35a8c 5540 else if (PL_opargs[type] & OA_DEFGV) {
11343788 5541 op_free(o);
54b9620d 5542 return newUNOP(type, 0, newDEFSVOP());
a0d0e21e
LW		 5543 }
5544
79072805
LW		 5545 if (oa) {
5546 while (oa & OA_OPTIONAL)
5547 oa >>= 4;
5548 if (oa && oa != OA_LIST)
53e06cf0 5549 return too_few_arguments(o,OP_DESC(o));
79072805 5550 }
11343788 5551 return o;
79072805
LW		 5552}
5553
5554OP *
cea2e8a9 5555Perl_ck_glob(pTHX_ OP *o)
79072805 5556{
27da23d5 5557 dVAR;
fb73857a 5558 GV *gv;
5559
649da076 5560 o = ck_fun(o);
1f2bfc8a 5561 if ((o->op_flags & OPf_KIDS) && !cLISTOPo->op_first->op_sibling)
54b9620d 5562 append_elem(OP_GLOB, o, newDEFSVOP());
fb73857a 5563
b9f751c0
GS		 5564 if (!((gv = gv_fetchpv("glob", FALSE, SVt_PVCV))
5565 && GvCVu(gv) && GvIMPORTED_CV(gv)))
5566 {
fb73857a 5567 gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
b9f751c0 5568 }
b1cb66bf 5569
52bb0670 5570#if !defined(PERL_EXTERNAL_GLOB)
72b16652 5571 /* XXX this can be tightened up and made more failsafe. */
f444d496 5572 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv))) {
7d3fb230 5573 GV *glob_gv;
72b16652 5574 ENTER;
00ca71c1
NIS		 5575 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
5576 newSVpvn("File::Glob", 10), Nullsv, Nullsv, Nullsv);
72b16652 5577 gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
7d3fb230
BS		 5578 glob_gv = gv_fetchpv("File::Glob::csh_glob", FALSE, SVt_PVCV);
5579 GvCV(gv) = GvCV(glob_gv);
7fc63493 5580 (void)SvREFCNT_inc((SV*)GvCV(gv));
7d3fb230 5581 GvIMPORTED_CV_on(gv);
72b16652
GS		 5582 LEAVE;
5583 }
52bb0670 5584#endif /* PERL_EXTERNAL_GLOB */
72b16652 5585
b9f751c0 5586 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
5196be3e 5587 append_elem(OP_GLOB, o,
80252599 5588 newSVOP(OP_CONST, 0, newSViv(PL_glob_index++)));
1f2bfc8a 5589 o->op_type = OP_LIST;
22c35a8c 5590 o->op_ppaddr = PL_ppaddr[OP_LIST];
1f2bfc8a 5591 cLISTOPo->op_first->op_type = OP_PUSHMARK;
22c35a8c 5592 cLISTOPo->op_first->op_ppaddr = PL_ppaddr[OP_PUSHMARK];
ad33f57d 5593 cLISTOPo->op_first->op_targ = 0;
1f2bfc8a 5594 o = newUNOP(OP_ENTERSUB, OPf_STACKED,
aeea060c 5595 append_elem(OP_LIST, o,
1f2bfc8a
MB		 5596 scalar(newUNOP(OP_RV2CV, 0,
5597 newGVOP(OP_GV, 0, gv)))));
d58bf5aa
MB		 5598 o = newUNOP(OP_NULL, 0, ck_subr(o));
5599 o->op_targ = OP_GLOB; /* hint at what it used to be */
5600 return o;
b1cb66bf 5601 }
5602 gv = newGVgen("main");
a0d0e21e 5603 gv_IOadd(gv);
11343788
MB		 5604 append_elem(OP_GLOB, o, newGVOP(OP_GV, 0, gv));
5605 scalarkids(o);
649da076 5606 return o;
79072805
LW		 5607}
5608
5609OP *
cea2e8a9 5610Perl_ck_grep(pTHX_ OP *o)
79072805 5611{
27da23d5 5612 dVAR;
79072805
LW		 5613 LOGOP *gwop;
5614 OP *kid;
6867be6d 5615 const OPCODE type = o->op_type == OP_GREPSTART ? OP_GREPWHILE : OP_MAPWHILE;
59f00321 5616 I32 offset;
79072805 5617
22c35a8c 5618 o->op_ppaddr = PL_ppaddr[OP_GREPSTART];
b7dc083c 5619 NewOp(1101, gwop, 1, LOGOP);
aeea060c 5620
11343788 5621 if (o->op_flags & OPf_STACKED) {
a0d0e21e 5622 OP* k;
11343788
MB		 5623 o = ck_sort(o);
5624 kid = cLISTOPo->op_first->op_sibling;
d09ad856
BS		 5625 if (!cUNOPx(kid)->op_next)
5626 Perl_croak(aTHX_ "panic: ck_grep");
e3c9a8b9 5627 for (k = cUNOPx(kid)->op_first; k; k = k->op_next) {
a0d0e21e
LW		 5628 kid = k;
5629 }
5630 kid->op_next = (OP*)gwop;
11343788 5631 o->op_flags &= ~OPf_STACKED;
93a17b20 5632 }
11343788 5633 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e
LW		 5634 if (type == OP_MAPWHILE)
5635 list(kid);
5636 else
5637 scalar(kid);
11343788 5638 o = ck_fun(o);
3280af22 5639 if (PL_error_count)
11343788 5640 return o;
aeea060c 5641 kid = cLISTOPo->op_first->op_sibling;
79072805 5642 if (kid->op_type != OP_NULL)
cea2e8a9 5643 Perl_croak(aTHX_ "panic: ck_grep");
79072805
LW		 5644 kid = kUNOP->op_first;
5645
a0d0e21e 5646 gwop->op_type = type;
22c35a8c 5647 gwop->op_ppaddr = PL_ppaddr[type];
11343788 5648 gwop->op_first = listkids(o);
79072805 5649 gwop->op_flags |= OPf_KIDS;
79072805 5650 gwop->op_other = LINKLIST(kid);
79072805 5651 kid->op_next = (OP*)gwop;
59f00321
RGS		 5652 offset = pad_findmy("$_");
5653 if (offset == NOT_IN_PAD || PAD_COMPNAME_FLAGS(offset) & SVpad_OUR) {
5654 o->op_private = gwop->op_private = 0;
5655 gwop->op_targ = pad_alloc(type, SVs_PADTMP);
5656 }
5657 else {
5658 o->op_private = gwop->op_private = OPpGREP_LEX;
5659 gwop->op_targ = o->op_targ = offset;
5660 }
79072805 5661
11343788 5662 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e 5663 if (!kid || !kid->op_sibling)
53e06cf0 5664 return too_few_arguments(o,OP_DESC(o));
a0d0e21e
LW		 5665 for (kid = kid->op_sibling; kid; kid = kid->op_sibling)
5666 mod(kid, OP_GREPSTART);
5667
79072805
LW		 5668 return (OP*)gwop;
5669}
5670
5671OP *
cea2e8a9 5672Perl_ck_index(pTHX_ OP *o)
79072805 5673{
11343788
MB		 5674 if (o->op_flags & OPf_KIDS) {
5675 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
0b71040e
LW		 5676 if (kid)
5677 kid = kid->op_sibling; /* get past "big" */
79072805 5678 if (kid && kid->op_type == OP_CONST)
2779dcf1 5679 fbm_compile(((SVOP*)kid)->op_sv, 0);
79072805 5680 }
11343788 5681 return ck_fun(o);
79072805
LW		 5682}
5683
5684OP *
cea2e8a9 5685Perl_ck_lengthconst(pTHX_ OP *o)
79072805
LW		 5686{
5687 /* XXX length optimization goes here */
11343788 5688 return ck_fun(o);
79072805
LW		 5689}
5690
5691OP *
cea2e8a9 5692Perl_ck_lfun(pTHX_ OP *o)
79072805 5693{
6867be6d 5694 const OPCODE type = o->op_type;
5dc0d613 5695 return modkids(ck_fun(o), type);
79072805
LW		 5696}
5697
5698OP *
cea2e8a9 5699Perl_ck_defined(pTHX_ OP *o) /* 19990527 MJD */
69794302 5700{
12bcd1a6 5701 if ((o->op_flags & OPf_KIDS) && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)) {
d0334bed
GS		 5702 switch (cUNOPo->op_first->op_type) {
5703 case OP_RV2AV:
a8739d98
JH		 5704 /* This is needed for
5705 if (defined %stash::)
5706 to work. Do not break Tk.
5707 */
1c846c1f 5708 break; /* Globals via GV can be undef */
d0334bed
GS		 5709 case OP_PADAV:
5710 case OP_AASSIGN: /* Is this a good idea? */
12bcd1a6 5711 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
f10b0346 5712 "defined(@array) is deprecated");
12bcd1a6 5713 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
cc507455 5714 "\t(Maybe you should just omit the defined()?)\n");
69794302 5715 break;
d0334bed 5716 case OP_RV2HV:
a8739d98
JH		 5717 /* This is needed for
5718 if (defined %stash::)
5719 to work. Do not break Tk.
5720 */
1c846c1f 5721 break; /* Globals via GV can be undef */
d0334bed 5722 case OP_PADHV:
12bcd1a6 5723 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
894356b3 5724 "defined(%%hash) is deprecated");
12bcd1a6 5725 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
cc507455 5726 "\t(Maybe you should just omit the defined()?)\n");
d0334bed
GS		 5727 break;
5728 default:
5729 /* no warning */
5730 break;
5731 }
69794302
MJD		 5732 }
5733 return ck_rfun(o);
5734}
5735
5736OP *
cea2e8a9 5737Perl_ck_rfun(pTHX_ OP *o)
8990e307 5738{
6867be6d 5739 const OPCODE type = o->op_type;
5dc0d613 5740 return refkids(ck_fun(o), type);
8990e307
LW		 5741}
5742
5743OP *
cea2e8a9 5744Perl_ck_listiob(pTHX_ OP *o)
79072805
LW		 5745{
5746 register OP *kid;
aeea060c 5747
11343788 5748 kid = cLISTOPo->op_first;
79072805 5749 if (!kid) {
11343788
MB		 5750 o = force_list(o);
5751 kid = cLISTOPo->op_first;
79072805
LW		 5752 }
5753 if (kid->op_type == OP_PUSHMARK)
5754 kid = kid->op_sibling;
11343788 5755 if (kid && o->op_flags & OPf_STACKED)
79072805
LW		 5756 kid = kid->op_sibling;
5757 else if (kid && !kid->op_sibling) { /* print HANDLE; */
5758 if (kid->op_type == OP_CONST && kid->op_private & OPpCONST_BARE) {
11343788 5759 o->op_flags |= OPf_STACKED; /* make it a filehandle */
748a9306 5760 kid = newUNOP(OP_RV2GV, OPf_REF, scalar(kid));
11343788
MB		 5761 cLISTOPo->op_first->op_sibling = kid;
5762 cLISTOPo->op_last = kid;
79072805
LW		 5763 kid = kid->op_sibling;
5764 }
5765 }
b2ffa427 5766
79072805 5767 if (!kid)
54b9620d 5768 append_elem(o->op_type, o, newDEFSVOP());
79072805 5769
2de3dbcc 5770 return listkids(o);
bbce6d69 5771}
5772
5773OP *
b162f9ea
IZ		 5774Perl_ck_sassign(pTHX_ OP *o)
5775{
5776 OP *kid = cLISTOPo->op_first;
5777 /* has a disposable target? */
5778 if ((PL_opargs[kid->op_type] & OA_TARGLEX)
6b66af17
GS		 5779 && !(kid->op_flags & OPf_STACKED)
5780 /* Cannot steal the second time! */
5781 && !(kid->op_private & OPpTARGET_MY))
b162f9ea
IZ		 5782 {
5783 OP *kkid = kid->op_sibling;
5784
5785 /* Can just relocate the target. */
2c2d71f5
JH		 5786 if (kkid && kkid->op_type == OP_PADSV
5787 && !(kkid->op_private & OPpLVAL_INTRO))
5788 {
b162f9ea 5789 kid->op_targ = kkid->op_targ;
743e66e6 5790 kkid->op_targ = 0;
b162f9ea
IZ		 5791 /* Now we do not need PADSV and SASSIGN. */
5792 kid->op_sibling = o->op_sibling; /* NULL */
5793 cLISTOPo->op_first = NULL;
5794 op_free(o);
5795 op_free(kkid);
5796 kid->op_private |= OPpTARGET_MY; /* Used for context settings */
5797 return kid;
5798 }
5799 }
b9d46b39
RGS		 5800 /* optimise C<my $x = undef> to C<my $x> */
5801 if (kid->op_type == OP_UNDEF) {
5802 OP *kkid = kid->op_sibling;
5803 if (kkid && kkid->op_type == OP_PADSV
5804 && (kkid->op_private & OPpLVAL_INTRO))
5805 {
5806 cLISTOPo->op_first = NULL;
5807 kid->op_sibling = NULL;
5808 op_free(o);
5809 op_free(kid);
5810 return kkid;
5811 }
5812 }
b162f9ea
IZ		 5813 return o;
5814}
5815
5816OP *
cea2e8a9 5817Perl_ck_match(pTHX_ OP *o)
79072805 5818{
59f00321 5819 if (o->op_type != OP_QR) {
6867be6d 5820 const I32 offset = pad_findmy("$_");
59f00321
RGS		 5821 if (offset != NOT_IN_PAD && !(PAD_COMPNAME_FLAGS(offset) & SVpad_OUR)) {
5822 o->op_targ = offset;
5823 o->op_private |= OPpTARGET_MY;
5824 }
5825 }
5826 if (o->op_type == OP_MATCH || o->op_type == OP_QR)
5827 o->op_private |= OPpRUNTIME;
11343788 5828 return o;
79072805
LW		 5829}
5830
5831OP *
f5d5a27c
CS		 5832Perl_ck_method(pTHX_ OP *o)
5833{
5834 OP *kid = cUNOPo->op_first;
5835 if (kid->op_type == OP_CONST) {
5836 SV* sv = kSVOP->op_sv;
b15aece3 5837 if (!(strchr(SvPVX_const(sv), ':') || strchr(SvPVX_const(sv), '\''))) {
f5d5a27c 5838 OP *cmop;
1c846c1f 5839 if (!SvREADONLY(sv) || !SvFAKE(sv)) {
b15aece3 5840 sv = newSVpvn_share(SvPVX_const(sv), SvCUR(sv), 0);
1c846c1f
NIS		 5841 }
5842 else {
5843 kSVOP->op_sv = Nullsv;
5844 }
f5d5a27c 5845 cmop = newSVOP(OP_METHOD_NAMED, 0, sv);
f5d5a27c
CS		 5846 op_free(o);
5847 return cmop;
5848 }
5849 }
5850 return o;
5851}
5852
5853OP *
cea2e8a9 5854Perl_ck_null(pTHX_ OP *o)
79072805 5855{
11343788 5856 return o;
79072805
LW		 5857}
5858
5859OP *
16fe6d59
GS		 5860Perl_ck_open(pTHX_ OP *o)
5861{
5862 HV *table = GvHV(PL_hintgv);
5863 if (table) {
5864 SV **svp;
5865 I32 mode;
5866 svp = hv_fetch(table, "open_IN", 7, FALSE);
5867 if (svp && *svp) {
5868 mode = mode_from_discipline(*svp);
5869 if (mode & O_BINARY)
5870 o->op_private |= OPpOPEN_IN_RAW;
5871 else if (mode & O_TEXT)
5872 o->op_private |= OPpOPEN_IN_CRLF;
5873 }
5874
5875 svp = hv_fetch(table, "open_OUT", 8, FALSE);
5876 if (svp && *svp) {
5877 mode = mode_from_discipline(*svp);
5878 if (mode & O_BINARY)
5879 o->op_private |= OPpOPEN_OUT_RAW;
5880 else if (mode & O_TEXT)
5881 o->op_private |= OPpOPEN_OUT_CRLF;
5882 }
5883 }
5884 if (o->op_type == OP_BACKTICK)
5885 return o;
3b82e551
JH		 5886 {
5887 /* In case of three-arg dup open remove strictness
5888 * from the last arg if it is a bareword. */
5889 OP *first = cLISTOPx(o)->op_first; /* The pushmark. */
5890 OP *last = cLISTOPx(o)->op_last; /* The bareword. */
5891 OP *oa;
b15aece3 5892 const char *mode;
3b82e551
JH		 5893
5894 if ((last->op_type == OP_CONST) && /* The bareword. */
5895 (last->op_private & OPpCONST_BARE) &&
5896 (last->op_private & OPpCONST_STRICT) &&
5897 (oa = first->op_sibling) && /* The fh. */
5898 (oa = oa->op_sibling) && /* The mode. */
5899 SvPOK(((SVOP*)oa)->op_sv) &&
b15aece3 5900 (mode = SvPVX_const(((SVOP*)oa)->op_sv)) &&
3b82e551
JH		 5901 mode[0] == '>' && mode[1] == '&' && /* A dup open. */
5902 (last == oa->op_sibling)) /* The bareword. */
5903 last->op_private &= ~OPpCONST_STRICT;
5904 }
16fe6d59
GS		 5905 return ck_fun(o);
5906}
5907
5908OP *
cea2e8a9 5909Perl_ck_repeat(pTHX_ OP *o)
79072805 5910{
11343788
MB		 5911 if (cBINOPo->op_first->op_flags & OPf_PARENS) {
5912 o->op_private |= OPpREPEAT_DOLIST;
5913 cBINOPo->op_first = force_list(cBINOPo->op_first);
79072805
LW		 5914 }
5915 else
11343788
MB		 5916 scalar(o);
5917 return o;
79072805
LW		 5918}
5919
5920OP *
cea2e8a9 5921Perl_ck_require(pTHX_ OP *o)
8990e307 5922{
ec4ab249
GA		 5923 GV* gv;
5924
11343788
MB		 5925 if (o->op_flags & OPf_KIDS) { /* Shall we supply missing .pm? */
5926 SVOP *kid = (SVOP*)cUNOPo->op_first;
8990e307
LW		 5927
5928 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
5c144d81
NC		 5929 SV *sv = kid->op_sv;
5930 U32 was_readonly = SvREADONLY(sv);
8990e307 5931 char *s;
5c144d81
NC		 5932
5933 if (was_readonly) {
5934 if (SvFAKE(sv)) {
5935 sv_force_normal_flags(sv, 0);
5936 assert(!SvREADONLY(sv));
5937 was_readonly = 0;
5938 } else {
5939 SvREADONLY_off(sv);
5940 }
5941 }
5942
5943 for (s = SvPVX(sv); *s; s++) {
a0d0e21e
LW		 5944 if (*s == ':' && s[1] == ':') {
5945 *s = '/';
1aef975c 5946 Move(s+2, s+1, strlen(s+2)+1, char);
5c144d81 5947 SvCUR_set(sv, SvCUR(sv) - 1);
a0d0e21e 5948 }
8990e307 5949 }
5c144d81
NC		 5950 sv_catpvn(sv, ".pm", 3);
5951 SvFLAGS(sv) |= was_readonly;
8990e307
LW		 5952 }
5953 }
ec4ab249
GA		 5954
5955 /* handle override, if any */
5956 gv = gv_fetchpv("require", FALSE, SVt_PVCV);
b9f751c0 5957 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv)))
ec4ab249
GA		 5958 gv = gv_fetchpv("CORE::GLOBAL::require", FALSE, SVt_PVCV);
5959
b9f751c0 5960 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
ec4ab249
GA		 5961 OP *kid = cUNOPo->op_first;
5962 cUNOPo->op_first = 0;
5963 op_free(o);
5964 return ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
5965 append_elem(OP_LIST, kid,
5966 scalar(newUNOP(OP_RV2CV, 0,
5967 newGVOP(OP_GV, 0,
5968 gv))))));
5969 }
5970
11343788 5971 return ck_fun(o);
8990e307
LW		 5972}
5973
78f9721b
SM		 5974OP *
5975Perl_ck_return(pTHX_ OP *o)
5976{
78f9721b 5977 if (CvLVALUE(PL_compcv)) {
6867be6d 5978 OP *kid;
78f9721b
SM		 5979 for (kid = cLISTOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
5980 mod(kid, OP_LEAVESUBLV);
5981 }
5982 return o;
5983}
5984
22c35a8c 5985#if 0
8990e307 5986OP *
cea2e8a9 5987Perl_ck_retarget(pTHX_ OP *o)
79072805 5988{
cea2e8a9 5989 Perl_croak(aTHX_ "NOT IMPL LINE %d",__LINE__);
79072805 5990 /* STUB */
11343788 5991 return o;
79072805 5992}
22c35a8c 5993#endif
79072805
LW		 5994
5995OP *
cea2e8a9 5996Perl_ck_select(pTHX_ OP *o)
79072805 5997{
27da23d5 5998 dVAR;
c07a80fd 5999 OP* kid;
11343788
MB		 6000 if (o->op_flags & OPf_KIDS) {
6001 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
2304df62 6002 if (kid && kid->op_sibling) {
11343788 6003 o->op_type = OP_SSELECT;
22c35a8c 6004 o->op_ppaddr = PL_ppaddr[OP_SSELECT];
11343788
MB		 6005 o = ck_fun(o);
6006 return fold_constants(o);
79072805
LW		 6007 }
6008 }
11343788
MB		 6009 o = ck_fun(o);
6010 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
c07a80fd 6011 if (kid && kid->op_type == OP_RV2GV)
6012 kid->op_private &= ~HINT_STRICT_REFS;
11343788 6013 return o;
79072805
LW		 6014}
6015
6016OP *
cea2e8a9 6017Perl_ck_shift(pTHX_ OP *o)
79072805 6018{
6867be6d 6019 const I32 type = o->op_type;
79072805 6020
11343788 6021 if (!(o->op_flags & OPf_KIDS)) {
6d4ff0d2 6022 OP *argop;
b2ffa427 6023
11343788 6024 op_free(o);
6d4ff0d2 6025 argop = newUNOP(OP_RV2AV, 0,
8fde6460 6026 scalar(newGVOP(OP_GV, 0, CvUNIQUE(PL_compcv) ? PL_argvgv : PL_defgv)));
6d4ff0d2 6027 return newUNOP(type, 0, scalar(argop));
79072805 6028 }
11343788 6029 return scalar(modkids(ck_fun(o), type));
79072805
LW		 6030}
6031
6032OP *
cea2e8a9 6033Perl_ck_sort(pTHX_ OP *o)
79072805 6034{
8e3f9bdf 6035 OP *firstkid;
bbce6d69 6036
9ea6e965 6037 if (o->op_type == OP_SORT && o->op_flags & OPf_STACKED)
51a19bc0 6038 simplify_sort(o);
8e3f9bdf
GS		 6039 firstkid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
6040 if (o->op_flags & OPf_STACKED) { /* may have been cleared */
9c5ffd7c 6041 OP *k = NULL;
8e3f9bdf 6042 OP *kid = cUNOPx(firstkid)->op_first; /* get past null */
79072805 6043
463ee0b2 6044 if (kid->op_type == OP_SCOPE || kid->op_type == OP_LEAVE) {
79072805 6045 linklist(kid);
463ee0b2
LW		 6046 if (kid->op_type == OP_SCOPE) {
6047 k = kid->op_next;
6048 kid->op_next = 0;
79072805 6049 }
463ee0b2 6050 else if (kid->op_type == OP_LEAVE) {
11343788 6051 if (o->op_type == OP_SORT) {
93c66552 6052 op_null(kid); /* wipe out leave */
748a9306 6053 kid->op_next = kid;
463ee0b2 6054
748a9306
LW		 6055 for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
6056 if (k->op_next == kid)
6057 k->op_next = 0;
71a29c3c
GS		 6058 /* don't descend into loops */
6059 else if (k->op_type == OP_ENTERLOOP
6060 || k->op_type == OP_ENTERITER)
6061 {
6062 k = cLOOPx(k)->op_lastop;
6063 }
748a9306 6064 }
463ee0b2 6065 }
748a9306
LW		 6066 else
6067 kid->op_next = 0; /* just disconnect the leave */
a0d0e21e 6068 k = kLISTOP->op_first;
463ee0b2 6069 }
a2efc822 6070 CALL_PEEP(k);
a0d0e21e 6071
8e3f9bdf
GS		 6072 kid = firstkid;
6073 if (o->op_type == OP_SORT) {
6074 /* provide scalar context for comparison function/block */
6075 kid = scalar(kid);
a0d0e21e 6076 kid->op_next = kid;
8e3f9bdf 6077 }
a0d0e21e
LW		 6078 else
6079 kid->op_next = k;
11343788 6080 o->op_flags |= OPf_SPECIAL;
79072805 6081 }
c6e96bcb 6082 else if (kid->op_type == OP_RV2SV || kid->op_type == OP_PADSV)
93c66552 6083 op_null(firstkid);
8e3f9bdf
GS		 6084
6085 firstkid = firstkid->op_sibling;
79072805 6086 }
bbce6d69 6087
8e3f9bdf
GS		 6088 /* provide list context for arguments */
6089 if (o->op_type == OP_SORT)
6090 list(firstkid);
6091
11343788 6092 return o;
79072805 6093}
bda4119b
GS		 6094
6095STATIC void
cea2e8a9 6096S_simplify_sort(pTHX_ OP *o)
9c007264
JH		 6097{
6098 register OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
6099 OP *k;
eb209983 6100 int descending;
350de78d 6101 GV *gv;
770526c1 6102 const char *gvname;
9c007264
JH		 6103 if (!(o->op_flags & OPf_STACKED))
6104 return;
1c846c1f
NIS		 6105 GvMULTI_on(gv_fetchpv("a", TRUE, SVt_PV));
6106 GvMULTI_on(gv_fetchpv("b", TRUE, SVt_PV));
82092f1d 6107 kid = kUNOP->op_first; /* get past null */
9c007264
JH		 6108 if (kid->op_type != OP_SCOPE)
6109 return;
6110 kid = kLISTOP->op_last; /* get past scope */
6111 switch(kid->op_type) {
6112 case OP_NCMP:
6113 case OP_I_NCMP:
6114 case OP_SCMP:
6115 break;
6116 default:
6117 return;
6118 }
6119 k = kid; /* remember this node*/
6120 if (kBINOP->op_first->op_type != OP_RV2SV)
6121 return;
6122 kid = kBINOP->op_first; /* get past cmp */
6123 if (kUNOP->op_first->op_type != OP_GV)
6124 return;
6125 kid = kUNOP->op_first; /* get past rv2sv */
638eceb6 6126 gv = kGVOP_gv;
350de78d 6127 if (GvSTASH(gv) != PL_curstash)
9c007264 6128 return;
770526c1
NC		 6129 gvname = GvNAME(gv);
6130 if (*gvname == 'a' && gvname[1] == '\0')
eb209983 6131 descending = 0;
770526c1 6132 else if (*gvname == 'b' && gvname[1] == '\0')
eb209983 6133 descending = 1;
9c007264
JH		 6134 else
6135 return;
eb209983 6136
9c007264
JH		 6137 kid = k; /* back to cmp */
6138 if (kBINOP->op_last->op_type != OP_RV2SV)
6139 return;
6140 kid = kBINOP->op_last; /* down to 2nd arg */
6141 if (kUNOP->op_first->op_type != OP_GV)
6142 return;
6143 kid = kUNOP->op_first; /* get past rv2sv */
638eceb6 6144 gv = kGVOP_gv;
770526c1
NC		 6145 if (GvSTASH(gv) != PL_curstash)
6146 return;
6147 gvname = GvNAME(gv);
6148 if ( descending
6149 ? !(*gvname == 'a' && gvname[1] == '\0')
6150 : !(*gvname == 'b' && gvname[1] == '\0'))
9c007264
JH		 6151 return;
6152 o->op_flags &= ~(OPf_STACKED | OPf_SPECIAL);
eb209983
NC		 6153 if (descending)
6154 o->op_private |= OPpSORT_DESCEND;
9c007264
JH		 6155 if (k->op_type == OP_NCMP)
6156 o->op_private |= OPpSORT_NUMERIC;
6157 if (k->op_type == OP_I_NCMP)
6158 o->op_private |= OPpSORT_NUMERIC | OPpSORT_INTEGER;
e507f050
SM		 6159 kid = cLISTOPo->op_first->op_sibling;
6160 cLISTOPo->op_first->op_sibling = kid->op_sibling; /* bypass old block */
6161 op_free(kid); /* then delete it */
9c007264 6162}
79072805
LW		 6163
6164OP *
cea2e8a9 6165Perl_ck_split(pTHX_ OP *o)
79072805 6166{
27da23d5 6167 dVAR;
79072805 6168 register OP *kid;
aeea060c 6169
11343788
MB		 6170 if (o->op_flags & OPf_STACKED)
6171 return no_fh_allowed(o);
79072805 6172
11343788 6173 kid = cLISTOPo->op_first;
8990e307 6174 if (kid->op_type != OP_NULL)
cea2e8a9 6175 Perl_croak(aTHX_ "panic: ck_split");
8990e307 6176 kid = kid->op_sibling;
11343788
MB		 6177 op_free(cLISTOPo->op_first);
6178 cLISTOPo->op_first = kid;
85e6fe83 6179 if (!kid) {
79cb57f6 6180 cLISTOPo->op_first = kid = newSVOP(OP_CONST, 0, newSVpvn(" ", 1));
11343788 6181 cLISTOPo->op_last = kid; /* There was only one element previously */
85e6fe83 6182 }
79072805 6183
de4bf5b3 6184 if (kid->op_type != OP_MATCH || kid->op_flags & OPf_STACKED) {
79072805 6185 OP *sibl = kid->op_sibling;
463ee0b2 6186 kid->op_sibling = 0;
131b3ad0 6187 kid = pmruntime( newPMOP(OP_MATCH, OPf_SPECIAL), kid, 0);
11343788
MB		 6188 if (cLISTOPo->op_first == cLISTOPo->op_last)
6189 cLISTOPo->op_last = kid;
6190 cLISTOPo->op_first = kid;
79072805
LW		 6191 kid->op_sibling = sibl;
6192 }
6193
6194 kid->op_type = OP_PUSHRE;
22c35a8c 6195 kid->op_ppaddr = PL_ppaddr[OP_PUSHRE];
79072805 6196 scalar(kid);
041457d9 6197 if (((PMOP *)kid)->op_pmflags & PMf_GLOBAL && ckWARN(WARN_REGEXP)) {
f34840d8
MJD		 6198 Perl_warner(aTHX_ packWARN(WARN_REGEXP),
6199 "Use of /g modifier is meaningless in split");
6200 }
79072805
LW		 6201
6202 if (!kid->op_sibling)
54b9620d 6203 append_elem(OP_SPLIT, o, newDEFSVOP());
79072805
LW		 6204
6205 kid = kid->op_sibling;
6206 scalar(kid);
6207
6208 if (!kid->op_sibling)
11343788 6209 append_elem(OP_SPLIT, o, newSVOP(OP_CONST, 0, newSViv(0)));
79072805
LW		 6210
6211 kid = kid->op_sibling;
6212 scalar(kid);
6213
6214 if (kid->op_sibling)
53e06cf0 6215 return too_many_arguments(o,OP_DESC(o));
79072805 6216
11343788 6217 return o;
79072805
LW		 6218}
6219
6220OP *
1c846c1f 6221Perl_ck_join(pTHX_ OP *o)
eb6e2d6f 6222{
041457d9
DM		 6223 const OP *kid = cLISTOPo->op_first->op_sibling;
6224 if (kid && kid->op_type == OP_MATCH) {
6225 if (ckWARN(WARN_SYNTAX)) {
6867be6d
AL		 6226 const REGEXP *re = PM_GETRE(kPMOP);
6227 const char *pmstr = re ? re->precomp : "STRING";
9014280d 6228 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
eb6e2d6f
GS		 6229 "/%s/ should probably be written as \"%s\"",
6230 pmstr, pmstr);
6231 }
6232 }
6233 return ck_fun(o);
6234}
6235
6236OP *
cea2e8a9 6237Perl_ck_subr(pTHX_ OP *o)
79072805 6238{
11343788
MB		 6239 OP *prev = ((cUNOPo->op_first->op_sibling)
6240 ? cUNOPo : ((UNOP*)cUNOPo->op_first))->op_first;
6241 OP *o2 = prev->op_sibling;
4633a7c4
LW		 6242 OP *cvop;
6243 char *proto = 0;
6244 CV *cv = 0;
46fc3d4c 6245 GV *namegv = 0;
4633a7c4
LW		 6246 int optional = 0;
6247 I32 arg = 0;
5b794e05 6248 I32 contextclass = 0;
90b7f708 6249 char *e = 0;
0723351e 6250 bool delete_op = 0;
4633a7c4 6251
d3011074 6252 o->op_private |= OPpENTERSUB_HASTARG;
11343788 6253 for (cvop = o2; cvop->op_sibling; cvop = cvop->op_sibling) ;
4633a7c4
LW		 6254 if (cvop->op_type == OP_RV2CV) {
6255 SVOP* tmpop;
11343788 6256 o->op_private |= (cvop->op_private & OPpENTERSUB_AMPER);
93c66552 6257 op_null(cvop); /* disable rv2cv */
4633a7c4 6258 tmpop = (SVOP*)((UNOP*)cvop)->op_first;
76cd736e 6259 if (tmpop->op_type == OP_GV && !(o->op_private & OPpENTERSUB_AMPER)) {
638eceb6 6260 GV *gv = cGVOPx_gv(tmpop);
350de78d 6261 cv = GvCVu(gv);
76cd736e
GS		 6262 if (!cv)
6263 tmpop->op_private |= OPpEARLY_CV;
06492da6
SF		 6264 else {
6265 if (SvPOK(cv)) {
6266 namegv = CvANON(cv) ? gv : CvGV(cv);
8b6b16e7 6267 proto = SvPV_nolen((SV*)cv);
06492da6
SF		 6268 }
6269 if (CvASSERTION(cv)) {
6270 if (PL_hints & HINT_ASSERTING) {
6271 if (PERLDB_ASSERTION && PL_curstash != PL_debstash)
6272 o->op_private |= OPpENTERSUB_DB;
6273 }
8fa7688f 6274 else {
0723351e 6275 delete_op = 1;
041457d9 6276 if (!(PL_hints & HINT_ASSERTIONSSEEN) && ckWARN(WARN_ASSERTIONS)) {
8fa7688f
SF		 6277 Perl_warner(aTHX_ packWARN(WARN_ASSERTIONS),
6278 "Impossible to activate assertion call");
6279 }
6280 }
06492da6 6281 }
46fc3d4c 6282 }
4633a7c4
LW		 6283 }
6284 }
f5d5a27c 6285 else if (cvop->op_type == OP_METHOD || cvop->op_type == OP_METHOD_NAMED) {
7a52d87a
GS		 6286 if (o2->op_type == OP_CONST)
6287 o2->op_private &= ~OPpCONST_STRICT;
58a40671
GS		 6288 else if (o2->op_type == OP_LIST) {
6289 OP *o = ((UNOP*)o2)->op_first->op_sibling;
6290 if (o && o->op_type == OP_CONST)
6291 o->op_private &= ~OPpCONST_STRICT;
6292 }
7a52d87a 6293 }
3280af22
NIS		 6294 o->op_private |= (PL_hints & HINT_STRICT_REFS);
6295 if (PERLDB_SUB && PL_curstash != PL_debstash)
11343788
MB		 6296 o->op_private |= OPpENTERSUB_DB;
6297 while (o2 != cvop) {
4633a7c4
LW		 6298 if (proto) {
6299 switch (*proto) {
6300 case '\0':
5dc0d613 6301 return too_many_arguments(o, gv_ename(namegv));
4633a7c4
LW		 6302 case ';':
6303 optional = 1;
6304 proto++;
6305 continue;
6306 case '$':
6307 proto++;
6308 arg++;
11343788 6309 scalar(o2);
4633a7c4
LW		 6310 break;
6311 case '%':
6312 case '@':
11343788 6313 list(o2);
4633a7c4
LW		 6314 arg++;
6315 break;
6316 case '&':
6317 proto++;
6318 arg++;
11343788 6319 if (o2->op_type != OP_REFGEN && o2->op_type != OP_UNDEF)
75fc29ea
GS		 6320 bad_type(arg,
6321 arg == 1 ? "block or sub {}" : "sub {}",
6322 gv_ename(namegv), o2);
4633a7c4
LW		 6323 break;
6324 case '*':
2ba6ecf4 6325 /* '*' allows any scalar type, including bareword */
4633a7c4
LW		 6326 proto++;
6327 arg++;
11343788 6328 if (o2->op_type == OP_RV2GV)
2ba6ecf4 6329 goto wrapref; /* autoconvert GLOB -> GLOBref */
7a52d87a
GS		 6330 else if (o2->op_type == OP_CONST)
6331 o2->op_private &= ~OPpCONST_STRICT;
9675f7ac
GS		 6332 else if (o2->op_type == OP_ENTERSUB) {
6333 /* accidental subroutine, revert to bareword */
6334 OP *gvop = ((UNOP*)o2)->op_first;
6335 if (gvop && gvop->op_type == OP_NULL) {
6336 gvop = ((UNOP*)gvop)->op_first;
6337 if (gvop) {
6338 for (; gvop->op_sibling; gvop = gvop->op_sibling)
6339 ;
6340 if (gvop &&
6341 (gvop->op_private & OPpENTERSUB_NOPAREN) &&
6342 (gvop = ((UNOP*)gvop)->op_first) &&
6343 gvop->op_type == OP_GV)
6344 {
638eceb6 6345 GV *gv = cGVOPx_gv(gvop);
9675f7ac 6346 OP *sibling = o2->op_sibling;
2692f720 6347 SV *n = newSVpvn("",0);
9675f7ac 6348 op_free(o2);
2a797ae2 6349 gv_fullname4(n, gv, "", FALSE);
2692f720 6350 o2 = newSVOP(OP_CONST, 0, n);
9675f7ac
GS		 6351 prev->op_sibling = o2;
6352 o2->op_sibling = sibling;
6353 }
6354 }
6355 }
6356 }
2ba6ecf4
GS		 6357 scalar(o2);
6358 break;
5b794e05
JH		 6359 case '[': case ']':
6360 goto oops;
6361 break;
4633a7c4
LW		 6362 case '\\':
6363 proto++;
6364 arg++;
5b794e05 6365 again:
4633a7c4 6366 switch (*proto++) {
5b794e05
JH		 6367 case '[':
6368 if (contextclass++ == 0) {
841d93c8 6369 e = strchr(proto, ']');
5b794e05
JH		 6370 if (!e || e == proto)
6371 goto oops;
6372 }
6373 else
6374 goto oops;
6375 goto again;
6376 break;
6377 case ']':
466bafcd 6378 if (contextclass) {
6867be6d
AL		 6379 char *p = proto;
6380 const char s = *p;
466bafcd
RGS		 6381 contextclass = 0;
6382 *p = '\0';
6383 while (*--p != '[');
1eb1540c 6384 bad_type(arg, Perl_form(aTHX_ "one of %s", p),
466bafcd
RGS		 6385 gv_ename(namegv), o2);
6386 *proto = s;
6387 } else
5b794e05
JH		 6388 goto oops;
6389 break;
4633a7c4 6390 case '*':
5b794e05
JH		 6391 if (o2->op_type == OP_RV2GV)
6392 goto wrapref;
6393 if (!contextclass)
6394 bad_type(arg, "symbol", gv_ename(namegv), o2);
6395 break;
4633a7c4 6396 case '&':
5b794e05
JH		 6397 if (o2->op_type == OP_ENTERSUB)
6398 goto wrapref;
6399 if (!contextclass)
6400 bad_type(arg, "subroutine entry", gv_ename(namegv), o2);
6401 break;
4633a7c4 6402 case '$':
5b794e05
JH		 6403 if (o2->op_type == OP_RV2SV ||
6404 o2->op_type == OP_PADSV ||
6405 o2->op_type == OP_HELEM ||
6406 o2->op_type == OP_AELEM ||
6407 o2->op_type == OP_THREADSV)
6408 goto wrapref;
6409 if (!contextclass)
5dc0d613 6410 bad_type(arg, "scalar", gv_ename(namegv), o2);
5b794e05 6411 break;
4633a7c4 6412 case '@':
5b794e05
JH		 6413 if (o2->op_type == OP_RV2AV ||
6414 o2->op_type == OP_PADAV)
6415 goto wrapref;
6416 if (!contextclass)
5dc0d613 6417 bad_type(arg, "array", gv_ename(namegv), o2);
5b794e05 6418 break;
4633a7c4 6419 case '%':
5b794e05
JH		 6420 if (o2->op_type == OP_RV2HV ||
6421 o2->op_type == OP_PADHV)
6422 goto wrapref;
6423 if (!contextclass)
6424 bad_type(arg, "hash", gv_ename(namegv), o2);
6425 break;
6426 wrapref:
4633a7c4 6427 {
11343788 6428 OP* kid = o2;
6fa846a0 6429 OP* sib = kid->op_sibling;
4633a7c4 6430 kid->op_sibling = 0;
6fa846a0
GS		 6431 o2 = newUNOP(OP_REFGEN, 0, kid);
6432 o2->op_sibling = sib;
e858de61 6433 prev->op_sibling = o2;
4633a7c4 6434 }
841d93c8 6435 if (contextclass && e) {
5b794e05
JH		 6436 proto = e + 1;
6437 contextclass = 0;
6438 }
4633a7c4
LW		 6439 break;
6440 default: goto oops;
6441 }
5b794e05
JH		 6442 if (contextclass)
6443 goto again;
4633a7c4 6444 break;
b1cb66bf 6445 case ' ':
6446 proto++;
6447 continue;
4633a7c4
LW		 6448 default:
6449 oops:
35c1215d
NC		 6450 Perl_croak(aTHX_ "Malformed prototype for %s: %"SVf,
6451 gv_ename(namegv), cv);
4633a7c4
LW		 6452 }
6453 }
6454 else
11343788
MB		 6455 list(o2);
6456 mod(o2, OP_ENTERSUB);
6457 prev = o2;
6458 o2 = o2->op_sibling;
4633a7c4 6459 }
fb73857a 6460 if (proto && !optional &&
6461 (*proto && *proto != '@' && *proto != '%' && *proto != ';'))
5dc0d613 6462 return too_few_arguments(o, gv_ename(namegv));
0723351e 6463 if(delete_op) {
06492da6
SF		 6464 op_free(o);
6465 o=newSVOP(OP_CONST, 0, newSViv(0));
6466 }
11343788 6467 return o;
79072805
LW		 6468}
6469
6470OP *
cea2e8a9 6471Perl_ck_svconst(pTHX_ OP *o)
8990e307 6472{
11343788
MB		 6473 SvREADONLY_on(cSVOPo->op_sv);
6474 return o;
8990e307
LW		 6475}
6476
6477OP *
cea2e8a9 6478Perl_ck_trunc(pTHX_ OP *o)
79072805 6479{
11343788
MB		 6480 if (o->op_flags & OPf_KIDS) {
6481 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 6482
a0d0e21e
LW		 6483 if (kid->op_type == OP_NULL)
6484 kid = (SVOP*)kid->op_sibling;
bb53490d
GS		 6485 if (kid && kid->op_type == OP_CONST &&
6486 (kid->op_private & OPpCONST_BARE))
6487 {
11343788 6488 o->op_flags |= OPf_SPECIAL;
bb53490d
GS		 6489 kid->op_private &= ~OPpCONST_STRICT;
6490 }
79072805 6491 }
11343788 6492 return ck_fun(o);
79072805
LW		 6493}
6494
35fba0d9 6495OP *
bab9c0ac
RGS		 6496Perl_ck_unpack(pTHX_ OP *o)
6497{
6498 OP *kid = cLISTOPo->op_first;
6499 if (kid->op_sibling) {
6500 kid = kid->op_sibling;
6501 if (!kid->op_sibling)
6502 kid->op_sibling = newDEFSVOP();
6503 }
6504 return ck_fun(o);
6505}
6506
6507OP *
35fba0d9
RG		 6508Perl_ck_substr(pTHX_ OP *o)
6509{
6510 o = ck_fun(o);
6511 if ((o->op_flags & OPf_KIDS) && o->op_private == 4) {
6512 OP *kid = cLISTOPo->op_first;
6513
6514 if (kid->op_type == OP_NULL)
6515 kid = kid->op_sibling;
6516 if (kid)
6517 kid->op_flags |= OPf_MOD;
6518
6519 }
6520 return o;
6521}
6522
61b743bb
DM		 6523/* A peephole optimizer. We visit the ops in the order they're to execute.
6524 * See the comments at the top of this file for more details about when
6525 * peep() is called */
463ee0b2 6526
79072805 6527void
864dbfa3 6528Perl_peep(pTHX_ register OP *o)
79072805 6529{
27da23d5 6530 dVAR;
79072805 6531 register OP* oldop = 0;
2d8e6c8d 6532
2814eb74 6533 if (!o || o->op_opt)
79072805 6534 return;
a0d0e21e 6535 ENTER;
462e5cf6 6536 SAVEOP();
7766f137 6537 SAVEVPTR(PL_curcop);
a0d0e21e 6538 for (; o; o = o->op_next) {
2814eb74 6539 if (o->op_opt)
a0d0e21e 6540 break;
533c011a 6541 PL_op = o;
a0d0e21e 6542 switch (o->op_type) {
acb36ea4 6543 case OP_SETSTATE:
a0d0e21e
LW		 6544 case OP_NEXTSTATE:
6545 case OP_DBSTATE:
3280af22 6546 PL_curcop = ((COP*)o); /* for warnings */
2814eb74 6547 o->op_opt = 1;
a0d0e21e
LW		 6548 break;
6549
a0d0e21e 6550 case OP_CONST:
7a52d87a
GS		 6551 if (cSVOPo->op_private & OPpCONST_STRICT)
6552 no_bareword_allowed(o);
7766f137 6553#ifdef USE_ITHREADS
3848b962 6554 case OP_METHOD_NAMED:
7766f137
GS		 6555 /* Relocate sv to the pad for thread safety.
6556 * Despite being a "constant", the SV is written to,
6557 * for reference counts, sv_upgrade() etc. */
6558 if (cSVOP->op_sv) {
6867be6d 6559 const PADOFFSET ix = pad_alloc(OP_CONST, SVs_PADTMP);
330e22d5 6560 if (o->op_type == OP_CONST && SvPADTMP(cSVOPo->op_sv)) {
6a7129a1 6561 /* If op_sv is already a PADTMP then it is being used by
9a049f1c 6562 * some pad, so make a copy. */
dd2155a4
DM		 6563 sv_setsv(PAD_SVl(ix),cSVOPo->op_sv);
6564 SvREADONLY_on(PAD_SVl(ix));
6a7129a1
GS		 6565 SvREFCNT_dec(cSVOPo->op_sv);
6566 }
6567 else {
dd2155a4 6568 SvREFCNT_dec(PAD_SVl(ix));
6a7129a1 6569 SvPADTMP_on(cSVOPo->op_sv);
dd2155a4 6570 PAD_SETSV(ix, cSVOPo->op_sv);
9a049f1c 6571 /* XXX I don't know how this isn't readonly already. */
dd2155a4 6572 SvREADONLY_on(PAD_SVl(ix));
6a7129a1 6573 }
7766f137
GS		 6574 cSVOPo->op_sv = Nullsv;
6575 o->op_targ = ix;
6576 }
6577#endif
2814eb74 6578 o->op_opt = 1;
07447971
GS		 6579 break;
6580
df91b2c5
AE		 6581 case OP_CONCAT:
6582 if (o->op_next && o->op_next->op_type == OP_STRINGIFY) {
6583 if (o->op_next->op_private & OPpTARGET_MY) {
6584 if (o->op_flags & OPf_STACKED) /* chained concats */
6585 goto ignore_optimization;
6586 else {
6587 /* assert(PL_opargs[o->op_type] & OA_TARGLEX); */
6588 o->op_targ = o->op_next->op_targ;
6589 o->op_next->op_targ = 0;
6590 o->op_private |= OPpTARGET_MY;
6591 }
6592 }
6593 op_null(o->op_next);
6594 }
6595 ignore_optimization:
2814eb74 6596 o->op_opt = 1;
df91b2c5 6597 break;
8990e307 6598 case OP_STUB:
54310121 6599 if ((o->op_flags & OPf_WANT) != OPf_WANT_LIST) {
2814eb74 6600 o->op_opt = 1;
54310121 6601 break; /* Scalar stub must produce undef. List stub is noop */
8990e307 6602 }
748a9306 6603 goto nothin;
79072805 6604 case OP_NULL:
acb36ea4
GS		 6605 if (o->op_targ == OP_NEXTSTATE
6606 || o->op_targ == OP_DBSTATE
6607 || o->op_targ == OP_SETSTATE)
6608 {
3280af22 6609 PL_curcop = ((COP*)o);
acb36ea4 6610 }
dad75012
AMS		 6611 /* XXX: We avoid setting op_seq here to prevent later calls
6612 to peep() from mistakenly concluding that optimisation
6613 has already occurred. This doesn't fix the real problem,
6614 though (See 20010220.007). AMS 20010719 */
2814eb74 6615 /* op_seq functionality is now replaced by op_opt */
dad75012
AMS		 6616 if (oldop && o->op_next) {
6617 oldop->op_next = o->op_next;
6618 continue;
6619 }
6620 break;
79072805 6621 case OP_SCALAR:
93a17b20 6622 case OP_LINESEQ:
463ee0b2 6623 case OP_SCOPE:
748a9306 6624 nothin:
a0d0e21e
LW		 6625 if (oldop && o->op_next) {
6626 oldop->op_next = o->op_next;
79072805
LW		 6627 continue;
6628 }
2814eb74 6629 o->op_opt = 1;
79072805
LW		 6630 break;
6631
6a077020 6632 case OP_PADAV:
79072805 6633 case OP_GV:
6a077020
DM		 6634 if (o->op_type == OP_PADAV || o->op_next->op_type == OP_RV2AV) {
6635 OP* pop = (o->op_type == OP_PADAV) ?
6636 o->op_next : o->op_next->op_next;
a0d0e21e 6637 IV i;
f9dc862f 6638 if (pop && pop->op_type == OP_CONST &&
af5acbb4 6639 ((PL_op = pop->op_next)) &&
8990e307 6640 pop->op_next->op_type == OP_AELEM &&
a0d0e21e 6641 !(pop->op_next->op_private &
78f9721b 6642 (OPpLVAL_INTRO|OPpLVAL_DEFER|OPpDEREF|OPpMAYBE_LVSUB)) &&
b0840a2a 6643 (i = SvIV(((SVOP*)pop)->op_sv) - PL_curcop->cop_arybase)
a0d0e21e 6644 <= 255 &&
8990e307
LW		 6645 i >= 0)
6646 {
350de78d 6647 GV *gv;
af5acbb4
DM		 6648 if (cSVOPx(pop)->op_private & OPpCONST_STRICT)
6649 no_bareword_allowed(pop);
6a077020
DM		 6650 if (o->op_type == OP_GV)
6651 op_null(o->op_next);
93c66552
DM		 6652 op_null(pop->op_next);
6653 op_null(pop);
a0d0e21e
LW		 6654 o->op_flags |= pop->op_next->op_flags & OPf_MOD;
6655 o->op_next = pop->op_next->op_next;
22c35a8c 6656 o->op_ppaddr = PL_ppaddr[OP_AELEMFAST];
a0d0e21e 6657 o->op_private = (U8)i;
6a077020
DM		 6658 if (o->op_type == OP_GV) {
6659 gv = cGVOPo_gv;
6660 GvAVn(gv);
6661 }
6662 else
6663 o->op_flags |= OPf_SPECIAL;
6664 o->op_type = OP_AELEMFAST;
6665 }
6666 o->op_opt = 1;
6667 break;
6668 }
6669
6670 if (o->op_next->op_type == OP_RV2SV) {
6671 if (!(o->op_next->op_private & OPpDEREF)) {
6672 op_null(o->op_next);
6673 o->op_private |= o->op_next->op_private & (OPpLVAL_INTRO
6674 | OPpOUR_INTRO);
6675 o->op_next = o->op_next->op_next;
6676 o->op_type = OP_GVSV;
6677 o->op_ppaddr = PL_ppaddr[OP_GVSV];
8990e307 6678 }
79072805 6679 }
e476b1b5 6680 else if ((o->op_private & OPpEARLY_CV) && ckWARN(WARN_PROTOTYPE)) {
638eceb6 6681 GV *gv = cGVOPo_gv;
b15aece3 6682 if (SvTYPE(gv) == SVt_PVGV && GvCV(gv) && SvPVX_const(GvCV(gv))) {
76cd736e
GS		 6683 /* XXX could check prototype here instead of just carping */
6684 SV *sv = sv_newmortal();
6685 gv_efullname3(sv, gv, Nullch);
9014280d 6686 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE),
35c1215d
NC		 6687 "%"SVf"() called too early to check prototype",
6688 sv);
76cd736e
GS		 6689 }
6690 }
89de2904
AMS		 6691 else if (o->op_next->op_type == OP_READLINE
6692 && o->op_next->op_next->op_type == OP_CONCAT
6693 && (o->op_next->op_next->op_flags & OPf_STACKED))
6694 {
d2c45030
AMS		 6695 /* Turn "$a .= <FH>" into an OP_RCATLINE. AMS 20010917 */
6696 o->op_type = OP_RCATLINE;
6697 o->op_flags |= OPf_STACKED;
6698 o->op_ppaddr = PL_ppaddr[OP_RCATLINE];
89de2904 6699 op_null(o->op_next->op_next);
d2c45030 6700 op_null(o->op_next);
89de2904 6701 }
76cd736e 6702
2814eb74 6703 o->op_opt = 1;
79072805
LW		 6704 break;
6705
a0d0e21e 6706 case OP_MAPWHILE:
79072805
LW		 6707 case OP_GREPWHILE:
6708 case OP_AND:
6709 case OP_OR:
c963b151 6710 case OP_DOR:
2c2d71f5
JH		 6711 case OP_ANDASSIGN:
6712 case OP_ORASSIGN:
c963b151 6713 case OP_DORASSIGN:
1a67a97c
SM		 6714 case OP_COND_EXPR:
6715 case OP_RANGE:
2814eb74 6716 o->op_opt = 1;
fd4d1407
IZ		 6717 while (cLOGOP->op_other->op_type == OP_NULL)
6718 cLOGOP->op_other = cLOGOP->op_other->op_next;
a2efc822 6719 peep(cLOGOP->op_other); /* Recursive calls are not replaced by fptr calls */
79072805
LW		 6720 break;
6721
79072805 6722 case OP_ENTERLOOP:
9c2ca71a 6723 case OP_ENTERITER:
2814eb74 6724 o->op_opt = 1;
58cccf98
SM		 6725 while (cLOOP->op_redoop->op_type == OP_NULL)
6726 cLOOP->op_redoop = cLOOP->op_redoop->op_next;
79072805 6727 peep(cLOOP->op_redoop);
58cccf98
SM		 6728 while (cLOOP->op_nextop->op_type == OP_NULL)
6729 cLOOP->op_nextop = cLOOP->op_nextop->op_next;
79072805 6730 peep(cLOOP->op_nextop);
58cccf98
SM		 6731 while (cLOOP->op_lastop->op_type == OP_NULL)
6732 cLOOP->op_lastop = cLOOP->op_lastop->op_next;
79072805
LW		 6733 peep(cLOOP->op_lastop);
6734 break;
6735
8782bef2 6736 case OP_QR:
79072805
LW		 6737 case OP_MATCH:
6738 case OP_SUBST:
2814eb74 6739 o->op_opt = 1;
9041c2e3 6740 while (cPMOP->op_pmreplstart &&
58cccf98
SM		 6741 cPMOP->op_pmreplstart->op_type == OP_NULL)
6742 cPMOP->op_pmreplstart = cPMOP->op_pmreplstart->op_next;
a0d0e21e 6743 peep(cPMOP->op_pmreplstart);
79072805
LW		 6744 break;
6745
a0d0e21e 6746 case OP_EXEC:
2814eb74 6747 o->op_opt = 1;
041457d9
DM		 6748 if (o->op_next && o->op_next->op_type == OP_NEXTSTATE
6749 && ckWARN(WARN_SYNTAX))
6750 {
a0d0e21e 6751 if (o->op_next->op_sibling &&
20408e3c
GS		 6752 o->op_next->op_sibling->op_type != OP_EXIT &&
6753 o->op_next->op_sibling->op_type != OP_WARN &&
a0d0e21e 6754 o->op_next->op_sibling->op_type != OP_DIE) {
6867be6d 6755 const line_t oldline = CopLINE(PL_curcop);
a0d0e21e 6756
57843af0 6757 CopLINE_set(PL_curcop, CopLINE((COP*)o->op_next));
9014280d 6758 Perl_warner(aTHX_ packWARN(WARN_EXEC),
eeb6a2c9 6759 "Statement unlikely to be reached");
9014280d 6760 Perl_warner(aTHX_ packWARN(WARN_EXEC),
cc507455 6761 "\t(Maybe you meant system() when you said exec()?)\n");
57843af0 6762 CopLINE_set(PL_curcop, oldline);
a0d0e21e
LW		 6763 }
6764 }
6765 break;
b2ffa427 6766
c750a3ec 6767 case OP_HELEM: {
e75d1f10 6768 UNOP *rop;
6d822dc4 6769 SV *lexname;
e75d1f10 6770 GV **fields;
6d822dc4 6771 SV **svp, *sv;
d5263905 6772 const char *key = NULL;
c750a3ec 6773 STRLEN keylen;
b2ffa427 6774
2814eb74 6775 o->op_opt = 1;
1c846c1f
NIS		 6776
6777 if (((BINOP*)o)->op_last->op_type != OP_CONST)
c750a3ec 6778 break;
1c846c1f
NIS		 6779
6780 /* Make the CONST have a shared SV */
6781 svp = cSVOPx_svp(((BINOP*)o)->op_last);
3049cdab 6782 if ((!SvFAKE(sv = *svp) || !SvREADONLY(sv)) && !IS_PADCONST(sv)) {
d5263905 6783 key = SvPV_const(sv, keylen);
25716404
GS		 6784 lexname = newSVpvn_share(key,
6785 SvUTF8(sv) ? -(I32)keylen : keylen,
6786 0);
1c846c1f
NIS		 6787 SvREFCNT_dec(sv);
6788 *svp = lexname;
6789 }
e75d1f10
RD		 6790
6791 if ((o->op_private & (OPpLVAL_INTRO)))
6792 break;
6793
6794 rop = (UNOP*)((BINOP*)o)->op_first;
6795 if (rop->op_type != OP_RV2HV || rop->op_first->op_type != OP_PADSV)
6796 break;
6797 lexname = *av_fetch(PL_comppad_name, rop->op_first->op_targ, TRUE);
6798 if (!(SvFLAGS(lexname) & SVpad_TYPED))
6799 break;
6800 fields = (GV**)hv_fetch(SvSTASH(lexname), "FIELDS", 6, FALSE);
6801 if (!fields || !GvHV(*fields))
6802 break;
93524f2b 6803 key = SvPV_const(*svp, keylen);
e75d1f10
RD		 6804 if (!hv_fetch(GvHV(*fields), key,
6805 SvUTF8(*svp) ? -(I32)keylen : keylen, FALSE))
6806 {
6807 Perl_croak(aTHX_ "No such class field \"%s\" "
6808 "in variable %s of type %s",
93524f2b 6809 key, SvPV_nolen_const(lexname), HvNAME_get(SvSTASH(lexname)));
e75d1f10
RD		 6810 }
6811
6d822dc4
MS		 6812 break;
6813 }
c750a3ec 6814
e75d1f10
RD		 6815 case OP_HSLICE: {
6816 UNOP *rop;
6817 SV *lexname;
6818 GV **fields;
6819 SV **svp;
93524f2b 6820 const char *key;
e75d1f10
RD		 6821 STRLEN keylen;
6822 SVOP *first_key_op, *key_op;
6823
6824 if ((o->op_private & (OPpLVAL_INTRO))
6825 /* I bet there's always a pushmark... */
6826 || ((LISTOP*)o)->op_first->op_sibling->op_type != OP_LIST)
6827 /* hmmm, no optimization if list contains only one key. */
6828 break;
6829 rop = (UNOP*)((LISTOP*)o)->op_last;
6830 if (rop->op_type != OP_RV2HV)
6831 break;
6832 if (rop->op_first->op_type == OP_PADSV)
6833 /* @$hash{qw(keys here)} */
6834 rop = (UNOP*)rop->op_first;
6835 else {
6836 /* @{$hash}{qw(keys here)} */
6837 if (rop->op_first->op_type == OP_SCOPE
6838 && cLISTOPx(rop->op_first)->op_last->op_type == OP_PADSV)
6839 {
6840 rop = (UNOP*)cLISTOPx(rop->op_first)->op_last;
6841 }
6842 else
6843 break;
6844 }
6845
6846 lexname = *av_fetch(PL_comppad_name, rop->op_targ, TRUE);
6847 if (!(SvFLAGS(lexname) & SVpad_TYPED))
6848 break;
6849 fields = (GV**)hv_fetch(SvSTASH(lexname), "FIELDS", 6, FALSE);
6850 if (!fields || !GvHV(*fields))
6851 break;
6852 /* Again guessing that the pushmark can be jumped over.... */
6853 first_key_op = (SVOP*)((LISTOP*)((LISTOP*)o)->op_first->op_sibling)
6854 ->op_first->op_sibling;
6855 for (key_op = first_key_op; key_op;
6856 key_op = (SVOP*)key_op->op_sibling) {
6857 if (key_op->op_type != OP_CONST)
6858 continue;
6859 svp = cSVOPx_svp(key_op);
93524f2b 6860 key = SvPV_const(*svp, keylen);
e75d1f10
RD		 6861 if (!hv_fetch(GvHV(*fields), key,
6862 SvUTF8(*svp) ? -(I32)keylen : keylen, FALSE))
6863 {
6864 Perl_croak(aTHX_ "No such class field \"%s\" "
6865 "in variable %s of type %s",
bfcb3514 6866 key, SvPV_nolen(lexname), HvNAME_get(SvSTASH(lexname)));
e75d1f10
RD		 6867 }
6868 }
6869 break;
6870 }
6871
fe1bc4cf 6872 case OP_SORT: {
fe1bc4cf
DM		 6873 /* will point to RV2AV or PADAV op on LHS/RHS of assign */
6874 OP *oleft, *oright;
6875 OP *o2;
6876
fe1bc4cf
DM		 6877 /* check that RHS of sort is a single plain array */
6878 oright = cUNOPo->op_first;
6879 if (!oright || oright->op_type != OP_PUSHMARK)
6880 break;
471178c0
NC		 6881
6882 /* reverse sort ... can be optimised. */
6883 if (!cUNOPo->op_sibling) {
6884 /* Nothing follows us on the list. */
6885 OP *reverse = o->op_next;
6886
6887 if (reverse->op_type == OP_REVERSE &&
6888 (reverse->op_flags & OPf_WANT) == OPf_WANT_LIST) {
6889 OP *pushmark = cUNOPx(reverse)->op_first;
6890 if (pushmark && (pushmark->op_type == OP_PUSHMARK)
6891 && (cUNOPx(pushmark)->op_sibling == o)) {
6892 /* reverse -> pushmark -> sort */
6893 o->op_private |= OPpSORT_REVERSE;
6894 op_null(reverse);
6895 pushmark->op_next = oright->op_next;
6896 op_null(oright);
6897 }
6898 }
6899 }
6900
6901 /* make @a = sort @a act in-place */
6902
6903 o->op_opt = 1;
6904
fe1bc4cf
DM		 6905 oright = cUNOPx(oright)->op_sibling;
6906 if (!oright)
6907 break;
6908 if (oright->op_type == OP_NULL) { /* skip sort block/sub */
6909 oright = cUNOPx(oright)->op_sibling;
6910 }
6911
6912 if (!oright ||
6913 (oright->op_type != OP_RV2AV && oright->op_type != OP_PADAV)
6914 || oright->op_next != o
6915 || (oright->op_private & OPpLVAL_INTRO)
6916 )
6917 break;
6918
6919 /* o2 follows the chain of op_nexts through the LHS of the
6920 * assign (if any) to the aassign op itself */
6921 o2 = o->op_next;
6922 if (!o2 || o2->op_type != OP_NULL)
6923 break;
6924 o2 = o2->op_next;
6925 if (!o2 || o2->op_type != OP_PUSHMARK)
6926 break;
6927 o2 = o2->op_next;
6928 if (o2 && o2->op_type == OP_GV)
6929 o2 = o2->op_next;
6930 if (!o2
6931 || (o2->op_type != OP_PADAV && o2->op_type != OP_RV2AV)
6932 || (o2->op_private & OPpLVAL_INTRO)
6933 )
6934 break;
6935 oleft = o2;
6936 o2 = o2->op_next;
6937 if (!o2 || o2->op_type != OP_NULL)
6938 break;
6939 o2 = o2->op_next;
6940 if (!o2 || o2->op_type != OP_AASSIGN
6941 || (o2->op_flags & OPf_WANT) != OPf_WANT_VOID)
6942 break;
6943
db7511db
DM		 6944 /* check that the sort is the first arg on RHS of assign */
6945
6946 o2 = cUNOPx(o2)->op_first;
6947 if (!o2 || o2->op_type != OP_NULL)
6948 break;
6949 o2 = cUNOPx(o2)->op_first;
6950 if (!o2 || o2->op_type != OP_PUSHMARK)
6951 break;
6952 if (o2->op_sibling != o)
6953 break;
6954
fe1bc4cf
DM		 6955 /* check the array is the same on both sides */
6956 if (oleft->op_type == OP_RV2AV) {
6957 if (oright->op_type != OP_RV2AV
6958 || !cUNOPx(oright)->op_first
6959 || cUNOPx(oright)->op_first->op_type != OP_GV
6960 || cGVOPx_gv(cUNOPx(oleft)->op_first) !=
6961 cGVOPx_gv(cUNOPx(oright)->op_first)
6962 )
6963 break;
6964 }
6965 else if (oright->op_type != OP_PADAV
6966 || oright->op_targ != oleft->op_targ
6967 )
6968 break;
6969
6970 /* transfer MODishness etc from LHS arg to RHS arg */
6971 oright->op_flags = oleft->op_flags;
6972 o->op_private |= OPpSORT_INPLACE;
6973
6974 /* excise push->gv->rv2av->null->aassign */
6975 o2 = o->op_next->op_next;
6976 op_null(o2); /* PUSHMARK */
6977 o2 = o2->op_next;
6978 if (o2->op_type == OP_GV) {
6979 op_null(o2); /* GV */
6980 o2 = o2->op_next;
6981 }
6982 op_null(o2); /* RV2AV or PADAV */
6983 o2 = o2->op_next->op_next;
6984 op_null(o2); /* AASSIGN */
6985
6986 o->op_next = o2->op_next;
6987
6988 break;
6989 }
ef3e5ea9
NC		 6990
6991 case OP_REVERSE: {
e682d7b7 6992 OP *ourmark, *theirmark, *ourlast, *iter, *expushmark, *rv2av;
ce335f37 6993 OP *gvop = NULL;
ef3e5ea9
NC		 6994 LISTOP *enter, *exlist;
6995 o->op_opt = 1;
6996
6997 enter = (LISTOP *) o->op_next;
6998 if (!enter)
6999 break;
7000 if (enter->op_type == OP_NULL) {
7001 enter = (LISTOP *) enter->op_next;
7002 if (!enter)
7003 break;
7004 }
d46f46af
NC		 7005 /* for $a (...) will have OP_GV then OP_RV2GV here.
7006 for (...) just has an OP_GV. */
ce335f37
NC		 7007 if (enter->op_type == OP_GV) {
7008 gvop = (OP *) enter;
7009 enter = (LISTOP *) enter->op_next;
7010 if (!enter)
7011 break;
d46f46af
NC		 7012 if (enter->op_type == OP_RV2GV) {
7013 enter = (LISTOP *) enter->op_next;
7014 if (!enter)
ce335f37 7015 break;
d46f46af 7016 }
ce335f37
NC		 7017 }
7018
ef3e5ea9
NC		 7019 if (enter->op_type != OP_ENTERITER)
7020 break;
7021
7022 iter = enter->op_next;
7023 if (!iter || iter->op_type != OP_ITER)
7024 break;
7025
ce335f37
NC		 7026 expushmark = enter->op_first;
7027 if (!expushmark || expushmark->op_type != OP_NULL
7028 || expushmark->op_targ != OP_PUSHMARK)
7029 break;
7030
7031 exlist = (LISTOP *) expushmark->op_sibling;
ef3e5ea9
NC		 7032 if (!exlist || exlist->op_type != OP_NULL
7033 || exlist->op_targ != OP_LIST)
7034 break;
7035
7036 if (exlist->op_last != o) {
7037 /* Mmm. Was expecting to point back to this op. */
7038 break;
7039 }
7040 theirmark = exlist->op_first;
7041 if (!theirmark || theirmark->op_type != OP_PUSHMARK)
7042 break;
7043
c491ecac 7044 if (theirmark->op_sibling != o) {
ef3e5ea9
NC		 7045 /* There's something between the mark and the reverse, eg
7046 for (1, reverse (...))
7047 so no go. */
7048 break;
7049 }
7050
c491ecac
NC		 7051 ourmark = ((LISTOP *)o)->op_first;
7052 if (!ourmark || ourmark->op_type != OP_PUSHMARK)
7053 break;
7054
ef3e5ea9
NC		 7055 ourlast = ((LISTOP *)o)->op_last;
7056 if (!ourlast || ourlast->op_next != o)
7057 break;
7058
e682d7b7
NC		 7059 rv2av = ourmark->op_sibling;
7060 if (rv2av && rv2av->op_type == OP_RV2AV && rv2av->op_sibling == 0
7061 && rv2av->op_flags == (OPf_WANT_LIST | OPf_KIDS)
7062 && enter->op_flags == (OPf_WANT_LIST | OPf_KIDS)) {
7063 /* We're just reversing a single array. */
7064 rv2av->op_flags = OPf_WANT_SCALAR | OPf_KIDS | OPf_REF;
7065 enter->op_flags |= OPf_STACKED;
7066 }
7067
ef3e5ea9
NC		 7068 /* We don't have control over who points to theirmark, so sacrifice
7069 ours. */
7070 theirmark->op_next = ourmark->op_next;
7071 theirmark->op_flags = ourmark->op_flags;
ce335f37 7072 ourlast->op_next = gvop ? gvop : (OP *) enter;
ef3e5ea9
NC		 7073 op_null(ourmark);
7074 op_null(o);
7075 enter->op_private |= OPpITER_REVERSED;
7076 iter->op_private |= OPpITER_REVERSED;
7077
7078 break;
7079 }
fe1bc4cf 7080
79072805 7081 default:
2814eb74 7082 o->op_opt = 1;
79072805
LW		 7083 break;
7084 }
a0d0e21e 7085 oldop = o;
79072805 7086 }
a0d0e21e 7087 LEAVE;
79072805 7088}
beab0874 7089
1cb0ed9b
RGS		 7090char*
7091Perl_custom_op_name(pTHX_ const OP* o)
53e06cf0 7092{
e1ec3a88 7093 const IV index = PTR2IV(o->op_ppaddr);
53e06cf0
SC		 7094 SV* keysv;
7095 HE* he;
7096
7097 if (!PL_custom_op_names) /* This probably shouldn't happen */
27da23d5 7098 return (char *)PL_op_name[OP_CUSTOM];
53e06cf0
SC		 7099
7100 keysv = sv_2mortal(newSViv(index));
7101
7102 he = hv_fetch_ent(PL_custom_op_names, keysv, 0, 0);
7103 if (!he)
27da23d5 7104 return (char *)PL_op_name[OP_CUSTOM]; /* Don't know who you are */
53e06cf0
SC		 7105
7106 return SvPV_nolen(HeVAL(he));
7107}
7108
1cb0ed9b
RGS		 7109char*
7110Perl_custom_op_desc(pTHX_ const OP* o)
53e06cf0 7111{
e1ec3a88 7112 const IV index = PTR2IV(o->op_ppaddr);
53e06cf0
SC		 7113 SV* keysv;
7114 HE* he;
7115
7116 if (!PL_custom_op_descs)
27da23d5 7117 return (char *)PL_op_desc[OP_CUSTOM];
53e06cf0
SC		 7118
7119 keysv = sv_2mortal(newSViv(index));
7120
7121 he = hv_fetch_ent(PL_custom_op_descs, keysv, 0, 0);
7122 if (!he)
27da23d5 7123 return (char *)PL_op_desc[OP_CUSTOM];
53e06cf0
SC		 7124
7125 return SvPV_nolen(HeVAL(he));
7126}
19e8ce8e 7127
beab0874
JT		 7128#include "XSUB.h"
7129
7130/* Efficient sub that returns a constant scalar value. */
7131static void
acfe0abc 7132const_sv_xsub(pTHX_ CV* cv)
beab0874
JT		 7133{
7134 dXSARGS;
9cbac4c7
DM		 7135 if (items != 0) {
7136#if 0
7137 Perl_croak(aTHX_ "usage: %s::%s()",
bfcb3514 7138 HvNAME_get(GvSTASH(CvGV(cv))), GvNAME(CvGV(cv)));
9cbac4c7
DM		 7139#endif
7140 }
9a049f1c 7141 EXTEND(sp, 1);
0768512c 7142 ST(0) = (SV*)XSANY.any_ptr;
beab0874
JT		 7143 XSRETURN(1);
7144}
4946a0fa
NC		 7145
7146/*
7147 * Local variables:
7148 * c-indentation-style: bsd
7149 * c-basic-offset: 4
7150 * indent-tabs-mode: t
7151 * End:
7152 *
37442d52
RGS		 7153 * ex: set ts=8 sts=4 sw=4 noet:
7154 */
Unnamed repository; edit this file 'description' to name the repository.