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Clear up a few more warnings from blead.
[perl5.git] / op.c
CommitLineData
a0d0e21e 1/* op.c
79072805 2 *
4bb101f2 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
acde74e1 4 * 2000, 2001, 2002, 2003, 2004, 2005, 2006, 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
06e0342d 76/* To implement user lexical pragmas, there needs to be a way at run time to
b3ca2e83
NC		 77 get the compile time state of %^H for that block. Storing %^H in every
78 block (or even COP) would be very expensive, so a different approach is
79 taken. The (running) state of %^H is serialised into a tree of HE-like
80 structs. Stores into %^H are chained onto the current leaf as a struct
81 refcounted_he * with the key and the value. Deletes from %^H are saved
82 with a value of PL_sv_placeholder. The state of %^H at any point can be
83 turned back into a regular HV by walking back up the tree from that point's
06e0342d 84 leaf, ignoring any key you've already seen (placeholder or not), storing
b3ca2e83
NC		 85 the rest into the HV structure, then removing the placeholders. Hence
86 memory is only used to store the %^H deltas from the enclosing COP, rather
87 than the entire %^H on each COP.
88
89 To cause actions on %^H to write out the serialisation records, it has
90 magic type 'H'. This magic (itself) does nothing, but its presence causes
91 the values to gain magic type 'h', which has entries for set and clear.
c28fe1ec 92 C<Perl_magic_sethint> updates C<PL_compiling.cop_hints_hash> with a store
b3ca2e83 93 record, with deletes written by C<Perl_magic_clearhint>. C<SAVE_HINTS>
c28fe1ec
NC		 94 saves the current C<PL_compiling.cop_hints_hash> on the save stack, so that
95 it will be correctly restored when any inner compiling scope is exited.
b3ca2e83
NC		 96*/
97
79072805 98#include "EXTERN.h"
864dbfa3 99#define PERL_IN_OP_C
79072805 100#include "perl.h"
77ca0c92 101#include "keywords.h"
79072805 102
a07e034d 103#define CALL_PEEP(o) CALL_FPTR(PL_peepp)(aTHX_ o)
a2efc822 104
238a4c30
NIS		 105#if defined(PL_OP_SLAB_ALLOC)
106
107#ifndef PERL_SLAB_SIZE
108#define PERL_SLAB_SIZE 2048
109#endif
110
c7e45529
AE		 111void *
112Perl_Slab_Alloc(pTHX_ int m, size_t sz)
1c846c1f 113{
5a8e194f
NIS		 114 /*
115 * To make incrementing use count easy PL_OpSlab is an I32 *
116 * To make inserting the link to slab PL_OpPtr is I32 **
117 * So compute size in units of sizeof(I32 *) as that is how Pl_OpPtr increments
118 * Add an overhead for pointer to slab and round up as a number of pointers
119 */
120 sz = (sz + 2*sizeof(I32 *) -1)/sizeof(I32 *);
238a4c30 121 if ((PL_OpSpace -= sz) < 0) {
083fcd59
JH		 122 PL_OpPtr = (I32 **) PerlMemShared_malloc(PERL_SLAB_SIZE*sizeof(I32*));
123 if (!PL_OpPtr) {
238a4c30
NIS		 124 return NULL;
125 }
5a8e194f
NIS		 126 Zero(PL_OpPtr,PERL_SLAB_SIZE,I32 **);
127 /* We reserve the 0'th I32 sized chunk as a use count */
128 PL_OpSlab = (I32 *) PL_OpPtr;
129 /* Reduce size by the use count word, and by the size we need.
130 * Latter is to mimic the '-=' in the if() above
131 */
132 PL_OpSpace = PERL_SLAB_SIZE - (sizeof(I32)+sizeof(I32 **)-1)/sizeof(I32 **) - sz;
238a4c30
NIS		 133 /* Allocation pointer starts at the top.
134 Theory: because we build leaves before trunk allocating at end
135 means that at run time access is cache friendly upward
136 */
5a8e194f 137 PL_OpPtr += PERL_SLAB_SIZE;
238a4c30
NIS		 138 }
139 assert( PL_OpSpace >= 0 );
140 /* Move the allocation pointer down */
141 PL_OpPtr -= sz;
5a8e194f 142 assert( PL_OpPtr > (I32 **) PL_OpSlab );
238a4c30
NIS		 143 *PL_OpPtr = PL_OpSlab; /* Note which slab it belongs to */
144 (*PL_OpSlab)++; /* Increment use count of slab */
5a8e194f 145 assert( PL_OpPtr+sz <= ((I32 **) PL_OpSlab + PERL_SLAB_SIZE) );
238a4c30
NIS		 146 assert( *PL_OpSlab > 0 );
147 return (void *)(PL_OpPtr + 1);
148}
149
c7e45529
AE		 150void
151Perl_Slab_Free(pTHX_ void *op)
238a4c30 152{
551405c4 153 I32 * const * const ptr = (I32 **) op;
aec46f14 154 I32 * const slab = ptr[-1];
5a8e194f
NIS		 155 assert( ptr-1 > (I32 **) slab );
156 assert( ptr < ( (I32 **) slab + PERL_SLAB_SIZE) );
238a4c30
NIS		 157 assert( *slab > 0 );
158 if (--(*slab) == 0) {
7e4e8c89
NC		 159# ifdef NETWARE
160# define PerlMemShared PerlMem
161# endif
083fcd59
JH		 162
163 PerlMemShared_free(slab);
238a4c30
NIS		 164 if (slab == PL_OpSlab) {
165 PL_OpSpace = 0;
166 }
167 }
b7dc083c 168}
b7dc083c 169#endif
e50aee73 170/*
ce6f1cbc 171 * In the following definition, the ", (OP*)0" is just to make the compiler
a5f75d66 172 * think the expression is of the right type: croak actually does a Siglongjmp.
e50aee73 173 */
11343788 174#define CHECKOP(type,o) \
ce6f1cbc 175 ((PL_op_mask && PL_op_mask[type]) \
5dc0d613 176 ? ( op_free((OP*)o), \
cb77fdf0 177 Perl_croak(aTHX_ "'%s' trapped by operation mask", PL_op_desc[type]), \
ce6f1cbc 178 (OP*)0 ) \
fc0dc3b3 179 : CALL_FPTR(PL_check[type])(aTHX_ (OP*)o))
e50aee73 180
e6438c1a 181#define RETURN_UNLIMITED_NUMBER (PERL_INT_MAX / 2)
c53d7c7d 182
8b6b16e7 183STATIC const char*
cea2e8a9 184S_gv_ename(pTHX_ GV *gv)
4633a7c4 185{
46c461b5 186 SV* const tmpsv = sv_newmortal();
bd61b366 187 gv_efullname3(tmpsv, gv, NULL);
8b6b16e7 188 return SvPV_nolen_const(tmpsv);
4633a7c4
LW		 189}
190
76e3520e 191STATIC OP *
cea2e8a9 192S_no_fh_allowed(pTHX_ OP *o)
79072805 193{
cea2e8a9 194 yyerror(Perl_form(aTHX_ "Missing comma after first argument to %s function",
53e06cf0 195 OP_DESC(o)));
11343788 196 return o;
79072805
LW		 197}
198
76e3520e 199STATIC OP *
bfed75c6 200S_too_few_arguments(pTHX_ OP *o, const char *name)
79072805 201{
cea2e8a9 202 yyerror(Perl_form(aTHX_ "Not enough arguments for %s", name));
11343788 203 return o;
79072805
LW		 204}
205
76e3520e 206STATIC OP *
bfed75c6 207S_too_many_arguments(pTHX_ OP *o, const char *name)
79072805 208{
cea2e8a9 209 yyerror(Perl_form(aTHX_ "Too many arguments for %s", name));
11343788 210 return o;
79072805
LW		 211}
212
76e3520e 213STATIC void
6867be6d 214S_bad_type(pTHX_ I32 n, const char *t, const char *name, const OP *kid)
8990e307 215{
cea2e8a9 216 yyerror(Perl_form(aTHX_ "Type of arg %d to %s must be %s (not %s)",
53e06cf0 217 (int)n, name, t, OP_DESC(kid)));
8990e307
LW		 218}
219
7a52d87a 220STATIC void
6867be6d 221S_no_bareword_allowed(pTHX_ const OP *o)
7a52d87a 222{
eb8433b7
NC		 223 if (PL_madskills)
224 return; /* various ok barewords are hidden in extra OP_NULL */
5a844595 225 qerror(Perl_mess(aTHX_
35c1215d 226 "Bareword \"%"SVf"\" not allowed while \"strict subs\" in use",
95b63a38 227 (void*)cSVOPo_sv));
7a52d87a
GS		 228}
229
79072805
LW		 230/* "register" allocation */
231
232PADOFFSET
262cbcdb 233Perl_allocmy(pTHX_ const char *const name)
93a17b20 234{
97aff369 235 dVAR;
a0d0e21e 236 PADOFFSET off;
3edf23ff 237 const bool is_our = (PL_in_my == KEY_our);
a0d0e21e 238
59f00321 239 /* complain about "my $<special_var>" etc etc */
6b58708b 240 if (*name &&
3edf23ff 241 !(is_our ||
155aba94 242 isALPHA(name[1]) ||
39e02b42 243 (USE_UTF8_IN_NAMES && UTF8_IS_START(name[1])) ||
6b58708b 244 (name[1] == '_' && (*name == '$' || name[2]))))
834a4ddd 245 {
6b58708b 246 /* name[2] is true if strlen(name) > 2 */
c4d0567e 247 if (!isPRINT(name[1]) || strchr("\t\n\r\f", name[1])) {
d1544d85
NC		 248 yyerror(Perl_form(aTHX_ "Can't use global %c^%c%s in \"my\"",
249 name[0], toCTRL(name[1]), name + 2));
250 } else {
251 yyerror(Perl_form(aTHX_ "Can't use global %s in \"my\"",name));
46fc3d4c 252 }
a0d0e21e 253 }
748a9306 254
dd2155a4 255 /* check for duplicate declaration */
3edf23ff 256 pad_check_dup(name, is_our, (PL_curstash ? PL_curstash : PL_defstash));
33b8ce05 257
dd2155a4
DM		 258 if (PL_in_my_stash && *name != '$') {
259 yyerror(Perl_form(aTHX_
260 "Can't declare class for non-scalar %s in \"%s\"",
952306ac
RGS		 261 name,
262 is_our ? "our" : PL_in_my == KEY_state ? "state" : "my"));
6b35e009
GS		 263 }
264
dd2155a4 265 /* allocate a spare slot and store the name in that slot */
93a17b20 266
dd2155a4
DM		 267 off = pad_add_name(name,
268 PL_in_my_stash,
3edf23ff 269 (is_our
133706a6
RGS		 270 /* $_ is always in main::, even with our */
271 ? (PL_curstash && !strEQ(name,"$_") ? PL_curstash : PL_defstash)
5c284bb0 272 : NULL
dd2155a4 273 ),
952306ac
RGS		 274 0, /* not fake */
275 PL_in_my == KEY_state
dd2155a4
DM		 276 );
277 return off;
79072805
LW		 278}
279
79072805
LW		 280/* Destructor */
281
282void
864dbfa3 283Perl_op_free(pTHX_ OP *o)
79072805 284{
27da23d5 285 dVAR;
acb36ea4 286 OPCODE type;
79072805 287
2814eb74 288 if (!o || o->op_static)
79072805
LW		 289 return;
290
67566ccd 291 type = o->op_type;
7934575e 292 if (o->op_private & OPpREFCOUNTED) {
67566ccd 293 switch (type) {
7934575e
GS		 294 case OP_LEAVESUB:
295 case OP_LEAVESUBLV:
296 case OP_LEAVEEVAL:
297 case OP_LEAVE:
298 case OP_SCOPE:
299 case OP_LEAVEWRITE:
67566ccd
AL		 300 {
301 PADOFFSET refcnt;
7934575e 302 OP_REFCNT_LOCK;
4026c95a 303 refcnt = OpREFCNT_dec(o);
7934575e 304 OP_REFCNT_UNLOCK;
4026c95a
SH		 305 if (refcnt)
306 return;
67566ccd 307 }
7934575e
GS		 308 break;
309 default:
310 break;
311 }
312 }
313
11343788 314 if (o->op_flags & OPf_KIDS) {
6867be6d 315 register OP *kid, *nextkid;
11343788 316 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 317 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 318 op_free(kid);
85e6fe83 319 }
79072805 320 }
acb36ea4 321 if (type == OP_NULL)
eb160463 322 type = (OPCODE)o->op_targ;
acb36ea4
GS		 323
324 /* COP* is not cleared by op_clear() so that we may track line
325 * numbers etc even after null() */
326 if (type == OP_NEXTSTATE || type == OP_SETSTATE || type == OP_DBSTATE)
327 cop_free((COP*)o);
328
329 op_clear(o);
238a4c30 330 FreeOp(o);
4d494880
DM		 331#ifdef DEBUG_LEAKING_SCALARS
332 if (PL_op == o)
5f66b61c 333 PL_op = NULL;
4d494880 334#endif
acb36ea4 335}
79072805 336
93c66552
DM		 337void
338Perl_op_clear(pTHX_ OP *o)
acb36ea4 339{
13137afc 340
27da23d5 341 dVAR;
eb8433b7
NC		 342#ifdef PERL_MAD
343 /* if (o->op_madprop && o->op_madprop->mad_next)
344 abort(); */
3cc8d589
NC		 345 /* FIXME for MAD - if I uncomment these two lines t/op/pack.t fails with
346 "modification of a read only value" for a reason I can't fathom why.
347 It's the "" stringification of $_, where $_ was set to '' in a foreach
04a4d38e
NC		 348 loop, but it defies simplification into a small test case.
349 However, commenting them out has caused ext/List/Util/t/weak.t to fail
350 the last test. */
3cc8d589
NC		 351 /*
352 mad_free(o->op_madprop);
353 o->op_madprop = 0;
354 */
eb8433b7
NC		 355#endif
356
357 retry:
11343788 358 switch (o->op_type) {
acb36ea4 359 case OP_NULL: /* Was holding old type, if any. */
eb8433b7
NC		 360 if (PL_madskills && o->op_targ != OP_NULL) {
361 o->op_type = o->op_targ;
362 o->op_targ = 0;
363 goto retry;
364 }
acb36ea4 365 case OP_ENTEREVAL: /* Was holding hints. */
acb36ea4 366 o->op_targ = 0;
a0d0e21e 367 break;
a6006777 368 default:
ac4c12e7 369 if (!(o->op_flags & OPf_REF)
0b94c7bb 370 || (PL_check[o->op_type] != MEMBER_TO_FPTR(Perl_ck_ftst)))
a6006777 371 break;
372 /* FALL THROUGH */
463ee0b2 373 case OP_GVSV:
79072805 374 case OP_GV:
a6006777 375 case OP_AELEMFAST:
6a077020
DM		 376 if (! (o->op_type == OP_AELEMFAST && o->op_flags & OPf_SPECIAL)) {
377 /* not an OP_PADAV replacement */
350de78d 378#ifdef USE_ITHREADS
6a077020
DM		 379 if (cPADOPo->op_padix > 0) {
380 /* No GvIN_PAD_off(cGVOPo_gv) here, because other references
381 * may still exist on the pad */
382 pad_swipe(cPADOPo->op_padix, TRUE);
383 cPADOPo->op_padix = 0;
384 }
350de78d 385#else
6a077020 386 SvREFCNT_dec(cSVOPo->op_sv);
a0714e2c 387 cSVOPo->op_sv = NULL;
350de78d 388#endif
6a077020 389 }
79072805 390 break;
a1ae71d2 391 case OP_METHOD_NAMED:
79072805 392 case OP_CONST:
11343788 393 SvREFCNT_dec(cSVOPo->op_sv);
a0714e2c 394 cSVOPo->op_sv = NULL;
3b1c21fa
AB		 395#ifdef USE_ITHREADS
396 /** Bug #15654
397 Even if op_clear does a pad_free for the target of the op,
6a077020 398 pad_free doesn't actually remove the sv that exists in the pad;
3b1c21fa
AB		 399 instead it lives on. This results in that it could be reused as
400 a target later on when the pad was reallocated.
401 **/
402 if(o->op_targ) {
403 pad_swipe(o->op_targ,1);
404 o->op_targ = 0;
405 }
406#endif
79072805 407 break;
748a9306
LW		 408 case OP_GOTO:
409 case OP_NEXT:
410 case OP_LAST:
411 case OP_REDO:
11343788 412 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 413 break;
414 /* FALL THROUGH */
a0d0e21e 415 case OP_TRANS:
acb36ea4 416 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
a0ed51b3 417 SvREFCNT_dec(cSVOPo->op_sv);
a0714e2c 418 cSVOPo->op_sv = NULL;
acb36ea4
GS		 419 }
420 else {
a0ed51b3 421 Safefree(cPVOPo->op_pv);
bd61b366 422 cPVOPo->op_pv = NULL;
acb36ea4 423 }
a0d0e21e
LW		 424 break;
425 case OP_SUBST:
11343788 426 op_free(cPMOPo->op_pmreplroot);
971a9dd3 427 goto clear_pmop;
748a9306 428 case OP_PUSHRE:
971a9dd3 429#ifdef USE_ITHREADS
ba89bb6e 430 if (INT2PTR(PADOFFSET, cPMOPo->op_pmreplroot)) {
dd2155a4
DM		 431 /* No GvIN_PAD_off here, because other references may still
432 * exist on the pad */
433 pad_swipe(INT2PTR(PADOFFSET, cPMOPo->op_pmreplroot), TRUE);
971a9dd3
GS		 434 }
435#else
436 SvREFCNT_dec((SV*)cPMOPo->op_pmreplroot);
437#endif
438 /* FALL THROUGH */
a0d0e21e 439 case OP_MATCH:
8782bef2 440 case OP_QR:
971a9dd3 441clear_pmop:
cb55de95 442 {
551405c4 443 HV * const pmstash = PmopSTASH(cPMOPo);
0565a181 444 if (pmstash && !SvIS_FREED(pmstash)) {
551405c4 445 MAGIC * const mg = mg_find((SV*)pmstash, PERL_MAGIC_symtab);
8d2f4536
NC		 446 if (mg) {
447 PMOP *pmop = (PMOP*) mg->mg_obj;
448 PMOP *lastpmop = NULL;
449 while (pmop) {
450 if (cPMOPo == pmop) {
451 if (lastpmop)
452 lastpmop->op_pmnext = pmop->op_pmnext;
453 else
454 mg->mg_obj = (SV*) pmop->op_pmnext;
455 break;
456 }
457 lastpmop = pmop;
458 pmop = pmop->op_pmnext;
cb55de95 459 }
cb55de95 460 }
83da49e6 461 }
05ec9bb3 462 PmopSTASH_free(cPMOPo);
cb55de95 463 }
5f66b61c 464 cPMOPo->op_pmreplroot = NULL;
5f8cb046
DM		 465 /* we use the "SAFE" version of the PM_ macros here
466 * since sv_clean_all might release some PMOPs
467 * after PL_regex_padav has been cleared
468 * and the clearing of PL_regex_padav needs to
469 * happen before sv_clean_all
470 */
471 ReREFCNT_dec(PM_GETRE_SAFE(cPMOPo));
5f66b61c 472 PM_SETRE_SAFE(cPMOPo, NULL);
13137afc
AB		 473#ifdef USE_ITHREADS
474 if(PL_regex_pad) { /* We could be in destruction */
475 av_push((AV*) PL_regex_pad[0],(SV*) PL_regex_pad[(cPMOPo)->op_pmoffset]);
1cc8b4c5 476 SvREPADTMP_on(PL_regex_pad[(cPMOPo)->op_pmoffset]);
13137afc
AB		 477 PM_SETRE(cPMOPo, (cPMOPo)->op_pmoffset);
478 }
1eb1540c 479#endif
13137afc 480
a0d0e21e 481 break;
79072805
LW		 482 }
483
743e66e6 484 if (o->op_targ > 0) {
11343788 485 pad_free(o->op_targ);
743e66e6
GS		 486 o->op_targ = 0;
487 }
79072805
LW		 488}
489
76e3520e 490STATIC void
3eb57f73
HS		 491S_cop_free(pTHX_ COP* cop)
492{
05ec9bb3
NIS		 493 Safefree(cop->cop_label); /* FIXME: treaddead ??? */
494 CopFILE_free(cop);
495 CopSTASH_free(cop);
0453d815 496 if (! specialWARN(cop->cop_warnings))
72dc9ed5 497 PerlMemShared_free(cop->cop_warnings);
c28fe1ec 498 Perl_refcounted_he_free(aTHX_ cop->cop_hints_hash);
3eb57f73
HS		 499}
500
93c66552
DM		 501void
502Perl_op_null(pTHX_ OP *o)
8990e307 503{
27da23d5 504 dVAR;
acb36ea4
GS		 505 if (o->op_type == OP_NULL)
506 return;
eb8433b7
NC		 507 if (!PL_madskills)
508 op_clear(o);
11343788
MB		 509 o->op_targ = o->op_type;
510 o->op_type = OP_NULL;
22c35a8c 511 o->op_ppaddr = PL_ppaddr[OP_NULL];
8990e307
LW		 512}
513
4026c95a
SH		 514void
515Perl_op_refcnt_lock(pTHX)
516{
27da23d5 517 dVAR;
96a5add6 518 PERL_UNUSED_CONTEXT;
4026c95a
SH		 519 OP_REFCNT_LOCK;
520}
521
522void
523Perl_op_refcnt_unlock(pTHX)
524{
27da23d5 525 dVAR;
96a5add6 526 PERL_UNUSED_CONTEXT;
4026c95a
SH		 527 OP_REFCNT_UNLOCK;
528}
529
79072805
LW		 530/* Contextualizers */
531
463ee0b2 532#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 533
534OP *
864dbfa3 535Perl_linklist(pTHX_ OP *o)
79072805 536{
3edf23ff 537 OP *first;
79072805 538
11343788
MB		 539 if (o->op_next)
540 return o->op_next;
79072805
LW		 541
542 /* establish postfix order */
3edf23ff
AL		 543 first = cUNOPo->op_first;
544 if (first) {
6867be6d 545 register OP *kid;
3edf23ff
AL		 546 o->op_next = LINKLIST(first);
547 kid = first;
548 for (;;) {
549 if (kid->op_sibling) {
79072805 550 kid->op_next = LINKLIST(kid->op_sibling);
3edf23ff
AL		 551 kid = kid->op_sibling;
552 } else {
11343788 553 kid->op_next = o;
3edf23ff
AL		 554 break;
555 }
79072805
LW		 556 }
557 }
558 else
11343788 559 o->op_next = o;
79072805 560
11343788 561 return o->op_next;
79072805
LW		 562}
563
564OP *
864dbfa3 565Perl_scalarkids(pTHX_ OP *o)
79072805 566{
11343788 567 if (o && o->op_flags & OPf_KIDS) {
bfed75c6 568 OP *kid;
11343788 569 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 570 scalar(kid);
571 }
11343788 572 return o;
79072805
LW		 573}
574
76e3520e 575STATIC OP *
cea2e8a9 576S_scalarboolean(pTHX_ OP *o)
8990e307 577{
97aff369 578 dVAR;
d008e5eb 579 if (o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
d008e5eb 580 if (ckWARN(WARN_SYNTAX)) {
6867be6d 581 const line_t oldline = CopLINE(PL_curcop);
a0d0e21e 582
d008e5eb 583 if (PL_copline != NOLINE)
57843af0 584 CopLINE_set(PL_curcop, PL_copline);
9014280d 585 Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "Found = in conditional, should be ==");
57843af0 586 CopLINE_set(PL_curcop, oldline);
d008e5eb 587 }
a0d0e21e 588 }
11343788 589 return scalar(o);
8990e307
LW		 590}
591
592OP *
864dbfa3 593Perl_scalar(pTHX_ OP *o)
79072805 594{
27da23d5 595 dVAR;
79072805
LW		 596 OP *kid;
597
a0d0e21e 598 /* assumes no premature commitment */
551405c4 599 if (!o || PL_error_count || (o->op_flags & OPf_WANT)
5dc0d613 600 || o->op_type == OP_RETURN)
7e363e51 601 {
11343788 602 return o;
7e363e51 603 }
79072805 604
5dc0d613 605 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 606
11343788 607 switch (o->op_type) {
79072805 608 case OP_REPEAT:
11343788 609 scalar(cBINOPo->op_first);
8990e307 610 break;
79072805
LW		 611 case OP_OR:
612 case OP_AND:
613 case OP_COND_EXPR:
11343788 614 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 615 scalar(kid);
79072805 616 break;
a0d0e21e 617 case OP_SPLIT:
11343788 618 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e 619 if (!kPMOP->op_pmreplroot)
12bcd1a6 620 deprecate_old("implicit split to @_");
a0d0e21e
LW		 621 }
622 /* FALL THROUGH */
79072805 623 case OP_MATCH:
8782bef2 624 case OP_QR:
79072805
LW		 625 case OP_SUBST:
626 case OP_NULL:
8990e307 627 default:
11343788
MB		 628 if (o->op_flags & OPf_KIDS) {
629 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 630 scalar(kid);
631 }
79072805
LW		 632 break;
633 case OP_LEAVE:
634 case OP_LEAVETRY:
5dc0d613 635 kid = cLISTOPo->op_first;
54310121 636 scalar(kid);
155aba94 637 while ((kid = kid->op_sibling)) {
54310121 638 if (kid->op_sibling)
639 scalarvoid(kid);
640 else
641 scalar(kid);
642 }
11206fdd 643 PL_curcop = &PL_compiling;
54310121 644 break;
748a9306 645 case OP_SCOPE:
79072805 646 case OP_LINESEQ:
8990e307 647 case OP_LIST:
11343788 648 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 649 if (kid->op_sibling)
650 scalarvoid(kid);
651 else
652 scalar(kid);
653 }
11206fdd 654 PL_curcop = &PL_compiling;
79072805 655 break;
a801c63c
RGS		 656 case OP_SORT:
657 if (ckWARN(WARN_VOID))
9014280d 658 Perl_warner(aTHX_ packWARN(WARN_VOID), "Useless use of sort in scalar context");
79072805 659 }
11343788 660 return o;
79072805
LW		 661}
662
663OP *
864dbfa3 664Perl_scalarvoid(pTHX_ OP *o)
79072805 665{
27da23d5 666 dVAR;
79072805 667 OP *kid;
c445ea15 668 const char* useless = NULL;
8990e307 669 SV* sv;
2ebea0a1
GS		 670 U8 want;
671
eb8433b7
NC		 672 /* trailing mad null ops don't count as "there" for void processing */
673 if (PL_madskills &&
674 o->op_type != OP_NULL &&
675 o->op_sibling &&
676 o->op_sibling->op_type == OP_NULL)
677 {
678 OP *sib;
679 for (sib = o->op_sibling;
680 sib && sib->op_type == OP_NULL;
681 sib = sib->op_sibling) ;
682
683 if (!sib)
684 return o;
685 }
686
acb36ea4
GS		 687 if (o->op_type == OP_NEXTSTATE
688 || o->op_type == OP_SETSTATE
689 || o->op_type == OP_DBSTATE
690 || (o->op_type == OP_NULL && (o->op_targ == OP_NEXTSTATE
691 || o->op_targ == OP_SETSTATE
692 || o->op_targ == OP_DBSTATE)))
2ebea0a1 693 PL_curcop = (COP*)o; /* for warning below */
79072805 694
54310121 695 /* assumes no premature commitment */
2ebea0a1
GS		 696 want = o->op_flags & OPf_WANT;
697 if ((want && want != OPf_WANT_SCALAR) || PL_error_count
5dc0d613 698 || o->op_type == OP_RETURN)
7e363e51 699 {
11343788 700 return o;
7e363e51 701 }
79072805 702
b162f9ea 703 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 704 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
705 {
b162f9ea 706 return scalar(o); /* As if inside SASSIGN */
7e363e51 707 }
1c846c1f 708
5dc0d613 709 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 710
11343788 711 switch (o->op_type) {
79072805 712 default:
22c35a8c 713 if (!(PL_opargs[o->op_type] & OA_FOLDCONST))
8990e307 714 break;
36477c24 715 /* FALL THROUGH */
716 case OP_REPEAT:
11343788 717 if (o->op_flags & OPf_STACKED)
8990e307 718 break;
5d82c453
GA		 719 goto func_ops;
720 case OP_SUBSTR:
721 if (o->op_private == 4)
722 break;
8990e307
LW		 723 /* FALL THROUGH */
724 case OP_GVSV:
725 case OP_WANTARRAY:
726 case OP_GV:
727 case OP_PADSV:
728 case OP_PADAV:
729 case OP_PADHV:
730 case OP_PADANY:
731 case OP_AV2ARYLEN:
8990e307 732 case OP_REF:
a0d0e21e
LW		 733 case OP_REFGEN:
734 case OP_SREFGEN:
8990e307
LW		 735 case OP_DEFINED:
736 case OP_HEX:
737 case OP_OCT:
738 case OP_LENGTH:
8990e307
LW		 739 case OP_VEC:
740 case OP_INDEX:
741 case OP_RINDEX:
742 case OP_SPRINTF:
743 case OP_AELEM:
744 case OP_AELEMFAST:
745 case OP_ASLICE:
8990e307
LW		 746 case OP_HELEM:
747 case OP_HSLICE:
748 case OP_UNPACK:
749 case OP_PACK:
8990e307
LW		 750 case OP_JOIN:
751 case OP_LSLICE:
752 case OP_ANONLIST:
753 case OP_ANONHASH:
754 case OP_SORT:
755 case OP_REVERSE:
756 case OP_RANGE:
757 case OP_FLIP:
758 case OP_FLOP:
759 case OP_CALLER:
760 case OP_FILENO:
761 case OP_EOF:
762 case OP_TELL:
763 case OP_GETSOCKNAME:
764 case OP_GETPEERNAME:
765 case OP_READLINK:
766 case OP_TELLDIR:
767 case OP_GETPPID:
768 case OP_GETPGRP:
769 case OP_GETPRIORITY:
770 case OP_TIME:
771 case OP_TMS:
772 case OP_LOCALTIME:
773 case OP_GMTIME:
774 case OP_GHBYNAME:
775 case OP_GHBYADDR:
776 case OP_GHOSTENT:
777 case OP_GNBYNAME:
778 case OP_GNBYADDR:
779 case OP_GNETENT:
780 case OP_GPBYNAME:
781 case OP_GPBYNUMBER:
782 case OP_GPROTOENT:
783 case OP_GSBYNAME:
784 case OP_GSBYPORT:
785 case OP_GSERVENT:
786 case OP_GPWNAM:
787 case OP_GPWUID:
788 case OP_GGRNAM:
789 case OP_GGRGID:
790 case OP_GETLOGIN:
78e1b766 791 case OP_PROTOTYPE:
5d82c453 792 func_ops:
64aac5a9 793 if (!(o->op_private & (OPpLVAL_INTRO|OPpOUR_INTRO)))
53e06cf0 794 useless = OP_DESC(o);
8990e307
LW		 795 break;
796
9f82cd5f
YST		 797 case OP_NOT:
798 kid = cUNOPo->op_first;
799 if (kid->op_type != OP_MATCH && kid->op_type != OP_SUBST &&
800 kid->op_type != OP_TRANS) {
801 goto func_ops;
802 }
803 useless = "negative pattern binding (!~)";
804 break;
805
8990e307
LW		 806 case OP_RV2GV:
807 case OP_RV2SV:
808 case OP_RV2AV:
809 case OP_RV2HV:
192587c2 810 if (!(o->op_private & (OPpLVAL_INTRO|OPpOUR_INTRO)) &&
11343788 811 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 812 useless = "a variable";
813 break;
79072805
LW		 814
815 case OP_CONST:
7766f137 816 sv = cSVOPo_sv;
7a52d87a
GS		 817 if (cSVOPo->op_private & OPpCONST_STRICT)
818 no_bareword_allowed(o);
819 else {
d008e5eb
GS		 820 if (ckWARN(WARN_VOID)) {
821 useless = "a constant";
2e0ae2d3 822 if (o->op_private & OPpCONST_ARYBASE)
d4c19fe8 823 useless = NULL;
e7fec78e 824 /* don't warn on optimised away booleans, eg
b5a930ec 825 * use constant Foo, 5; Foo || print; */
e7fec78e 826 if (cSVOPo->op_private & OPpCONST_SHORTCIRCUIT)
d4c19fe8 827 useless = NULL;
960b4253
MG		 828 /* the constants 0 and 1 are permitted as they are
829 conventionally used as dummies in constructs like
830 1 while some_condition_with_side_effects; */
e7fec78e 831 else if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
d4c19fe8 832 useless = NULL;
d008e5eb 833 else if (SvPOK(sv)) {
a52fe3ac
A		 834 /* perl4's way of mixing documentation and code
835 (before the invention of POD) was based on a
836 trick to mix nroff and perl code. The trick was
837 built upon these three nroff macros being used in
838 void context. The pink camel has the details in
839 the script wrapman near page 319. */
6136c704
AL		 840 const char * const maybe_macro = SvPVX_const(sv);
841 if (strnEQ(maybe_macro, "di", 2) ||
842 strnEQ(maybe_macro, "ds", 2) ||
843 strnEQ(maybe_macro, "ig", 2))
d4c19fe8 844 useless = NULL;
d008e5eb 845 }
8990e307
LW		 846 }
847 }
93c66552 848 op_null(o); /* don't execute or even remember it */
79072805
LW		 849 break;
850
851 case OP_POSTINC:
11343788 852 o->op_type = OP_PREINC; /* pre-increment is faster */
22c35a8c 853 o->op_ppaddr = PL_ppaddr[OP_PREINC];
79072805
LW		 854 break;
855
856 case OP_POSTDEC:
11343788 857 o->op_type = OP_PREDEC; /* pre-decrement is faster */
22c35a8c 858 o->op_ppaddr = PL_ppaddr[OP_PREDEC];
79072805
LW		 859 break;
860
679d6c4e
HS		 861 case OP_I_POSTINC:
862 o->op_type = OP_I_PREINC; /* pre-increment is faster */
863 o->op_ppaddr = PL_ppaddr[OP_I_PREINC];
864 break;
865
866 case OP_I_POSTDEC:
867 o->op_type = OP_I_PREDEC; /* pre-decrement is faster */
868 o->op_ppaddr = PL_ppaddr[OP_I_PREDEC];
869 break;
870
79072805
LW		 871 case OP_OR:
872 case OP_AND:
c963b151 873 case OP_DOR:
79072805 874 case OP_COND_EXPR:
0d863452
RH		 875 case OP_ENTERGIVEN:
876 case OP_ENTERWHEN:
11343788 877 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 878 scalarvoid(kid);
879 break;
5aabfad6 880
a0d0e21e 881 case OP_NULL:
11343788 882 if (o->op_flags & OPf_STACKED)
a0d0e21e 883 break;
5aabfad6 884 /* FALL THROUGH */
2ebea0a1
GS		 885 case OP_NEXTSTATE:
886 case OP_DBSTATE:
79072805
LW		 887 case OP_ENTERTRY:
888 case OP_ENTER:
11343788 889 if (!(o->op_flags & OPf_KIDS))
79072805 890 break;
54310121 891 /* FALL THROUGH */
463ee0b2 892 case OP_SCOPE:
79072805
LW		 893 case OP_LEAVE:
894 case OP_LEAVETRY:
a0d0e21e 895 case OP_LEAVELOOP:
79072805 896 case OP_LINESEQ:
79072805 897 case OP_LIST:
0d863452
RH		 898 case OP_LEAVEGIVEN:
899 case OP_LEAVEWHEN:
11343788 900 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 901 scalarvoid(kid);
902 break;
c90c0ff4 903 case OP_ENTEREVAL:
5196be3e 904 scalarkids(o);
c90c0ff4 905 break;
5aabfad6 906 case OP_REQUIRE:
c90c0ff4 907 /* all requires must return a boolean value */
5196be3e 908 o->op_flags &= ~OPf_WANT;
d6483035
GS		 909 /* FALL THROUGH */
910 case OP_SCALAR:
5196be3e 911 return scalar(o);
a0d0e21e 912 case OP_SPLIT:
11343788 913 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e 914 if (!kPMOP->op_pmreplroot)
12bcd1a6 915 deprecate_old("implicit split to @_");
a0d0e21e
LW		 916 }
917 break;
79072805 918 }
411caa50 919 if (useless && ckWARN(WARN_VOID))
9014280d 920 Perl_warner(aTHX_ packWARN(WARN_VOID), "Useless use of %s in void context", useless);
11343788 921 return o;
79072805
LW		 922}
923
924OP *
864dbfa3 925Perl_listkids(pTHX_ OP *o)
79072805 926{
11343788 927 if (o && o->op_flags & OPf_KIDS) {
6867be6d 928 OP *kid;
11343788 929 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 930 list(kid);
931 }
11343788 932 return o;
79072805
LW		 933}
934
935OP *
864dbfa3 936Perl_list(pTHX_ OP *o)
79072805 937{
27da23d5 938 dVAR;
79072805
LW		 939 OP *kid;
940
a0d0e21e 941 /* assumes no premature commitment */
3280af22 942 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 943 || o->op_type == OP_RETURN)
7e363e51 944 {
11343788 945 return o;
7e363e51 946 }
79072805 947
b162f9ea 948 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 949 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
950 {
b162f9ea 951 return o; /* As if inside SASSIGN */
7e363e51 952 }
1c846c1f 953
5dc0d613 954 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 955
11343788 956 switch (o->op_type) {
79072805
LW		 957 case OP_FLOP:
958 case OP_REPEAT:
11343788 959 list(cBINOPo->op_first);
79072805
LW		 960 break;
961 case OP_OR:
962 case OP_AND:
963 case OP_COND_EXPR:
11343788 964 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 965 list(kid);
966 break;
967 default:
968 case OP_MATCH:
8782bef2 969 case OP_QR:
79072805
LW		 970 case OP_SUBST:
971 case OP_NULL:
11343788 972 if (!(o->op_flags & OPf_KIDS))
79072805 973 break;
11343788
MB		 974 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
975 list(cBINOPo->op_first);
976 return gen_constant_list(o);
79072805
LW		 977 }
978 case OP_LIST:
11343788 979 listkids(o);
79072805
LW		 980 break;
981 case OP_LEAVE:
982 case OP_LEAVETRY:
5dc0d613 983 kid = cLISTOPo->op_first;
54310121 984 list(kid);
155aba94 985 while ((kid = kid->op_sibling)) {
54310121 986 if (kid->op_sibling)
987 scalarvoid(kid);
988 else
989 list(kid);
990 }
11206fdd 991 PL_curcop = &PL_compiling;
54310121 992 break;
748a9306 993 case OP_SCOPE:
79072805 994 case OP_LINESEQ:
11343788 995 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 996 if (kid->op_sibling)
997 scalarvoid(kid);
998 else
999 list(kid);
1000 }
11206fdd 1001 PL_curcop = &PL_compiling;
79072805 1002 break;
c90c0ff4 1003 case OP_REQUIRE:
1004 /* all requires must return a boolean value */
5196be3e
MB		 1005 o->op_flags &= ~OPf_WANT;
1006 return scalar(o);
79072805 1007 }
11343788 1008 return o;
79072805
LW		 1009}
1010
1011OP *
864dbfa3 1012Perl_scalarseq(pTHX_ OP *o)
79072805 1013{
97aff369 1014 dVAR;
11343788 1015 if (o) {
1496a290
AL		 1016 const OPCODE type = o->op_type;
1017
1018 if (type == OP_LINESEQ || type == OP_SCOPE ||
1019 type == OP_LEAVE || type == OP_LEAVETRY)
463ee0b2 1020 {
6867be6d 1021 OP *kid;
11343788 1022 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 1023 if (kid->op_sibling) {
463ee0b2 1024 scalarvoid(kid);
ed6116ce 1025 }
463ee0b2 1026 }
3280af22 1027 PL_curcop = &PL_compiling;
79072805 1028 }
11343788 1029 o->op_flags &= ~OPf_PARENS;
3280af22 1030 if (PL_hints & HINT_BLOCK_SCOPE)
11343788 1031 o->op_flags |= OPf_PARENS;
79072805 1032 }
8990e307 1033 else
11343788
MB		 1034 o = newOP(OP_STUB, 0);
1035 return o;
79072805
LW		 1036}
1037
76e3520e 1038STATIC OP *
cea2e8a9 1039S_modkids(pTHX_ OP *o, I32 type)
79072805 1040{
11343788 1041 if (o && o->op_flags & OPf_KIDS) {
6867be6d 1042 OP *kid;
11343788 1043 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 1044 mod(kid, type);
79072805 1045 }
11343788 1046 return o;
79072805
LW		 1047}
1048
ff7298cb 1049/* Propagate lvalue ("modifiable") context to an op and its children.
ddeae0f1
DM		 1050 * 'type' represents the context type, roughly based on the type of op that
1051 * would do the modifying, although local() is represented by OP_NULL.
1052 * It's responsible for detecting things that can't be modified, flag
1053 * things that need to behave specially in an lvalue context (e.g., "$$x = 5"
1054 * might have to vivify a reference in $x), and so on.
1055 *
1056 * For example, "$a+1 = 2" would cause mod() to be called with o being
1057 * OP_ADD and type being OP_SASSIGN, and would output an error.
1058 */
1059
79072805 1060OP *
864dbfa3 1061Perl_mod(pTHX_ OP *o, I32 type)
79072805 1062{
27da23d5 1063 dVAR;
79072805 1064 OP *kid;
ddeae0f1
DM		 1065 /* -1 = error on localize, 0 = ignore localize, 1 = ok to localize */
1066 int localize = -1;
79072805 1067
3280af22 1068 if (!o || PL_error_count)
11343788 1069 return o;
79072805 1070
b162f9ea 1071 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 1072 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
1073 {
b162f9ea 1074 return o;
7e363e51 1075 }
1c846c1f 1076
11343788 1077 switch (o->op_type) {
68dc0745 1078 case OP_UNDEF:
ddeae0f1 1079 localize = 0;
3280af22 1080 PL_modcount++;
5dc0d613 1081 return o;
a0d0e21e 1082 case OP_CONST:
2e0ae2d3 1083 if (!(o->op_private & OPpCONST_ARYBASE))
a0d0e21e 1084 goto nomod;
54dc0f91 1085 localize = 0;
3280af22 1086 if (PL_eval_start && PL_eval_start->op_type == OP_CONST) {
fc15ae8f
NC		 1087 CopARYBASE_set(&PL_compiling,
1088 (I32)SvIV(cSVOPx(PL_eval_start)->op_sv));
3280af22 1089 PL_eval_start = 0;
a0d0e21e
LW		 1090 }
1091 else if (!type) {
fc15ae8f
NC		 1092 SAVECOPARYBASE(&PL_compiling);
1093 CopARYBASE_set(&PL_compiling, 0);
a0d0e21e
LW		 1094 }
1095 else if (type == OP_REFGEN)
1096 goto nomod;
1097 else
cea2e8a9 1098 Perl_croak(aTHX_ "That use of $[ is unsupported");
a0d0e21e 1099 break;
5f05dabc 1100 case OP_STUB:
eb8433b7 1101 if (o->op_flags & OPf_PARENS || PL_madskills)
5f05dabc 1102 break;
1103 goto nomod;
a0d0e21e
LW		 1104 case OP_ENTERSUB:
1105 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1106 !(o->op_flags & OPf_STACKED)) {
1107 o->op_type = OP_RV2CV; /* entersub => rv2cv */
e26df76a
NC		 1108 /* The default is to set op_private to the number of children,
1109 which for a UNOP such as RV2CV is always 1. And w're using
1110 the bit for a flag in RV2CV, so we need it clear. */
1111 o->op_private &= ~1;
22c35a8c 1112 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788 1113 assert(cUNOPo->op_first->op_type == OP_NULL);
93c66552 1114 op_null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1115 break;
1116 }
95f0a2f1
SB		 1117 else if (o->op_private & OPpENTERSUB_NOMOD)
1118 return o;
cd06dffe
GS		 1119 else { /* lvalue subroutine call */
1120 o->op_private |= OPpLVAL_INTRO;
e6438c1a 1121 PL_modcount = RETURN_UNLIMITED_NUMBER;
4978d6d9 1122 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN) {
cd06dffe
GS		 1123 /* Backward compatibility mode: */
1124 o->op_private |= OPpENTERSUB_INARGS;
1125 break;
1126 }
1127 else { /* Compile-time error message: */
1128 OP *kid = cUNOPo->op_first;
1129 CV *cv;
1130 OP *okid;
1131
3ea285d1
AL		 1132 if (kid->op_type != OP_PUSHMARK) {
1133 if (kid->op_type != OP_NULL || kid->op_targ != OP_LIST)
1134 Perl_croak(aTHX_
1135 "panic: unexpected lvalue entersub "
1136 "args: type/targ %ld:%"UVuf,
1137 (long)kid->op_type, (UV)kid->op_targ);
1138 kid = kLISTOP->op_first;
1139 }
cd06dffe
GS		 1140 while (kid->op_sibling)
1141 kid = kid->op_sibling;
1142 if (!(kid->op_type == OP_NULL && kid->op_targ == OP_RV2CV)) {
1143 /* Indirect call */
1144 if (kid->op_type == OP_METHOD_NAMED
1145 || kid->op_type == OP_METHOD)
1146 {
87d7fd28 1147 UNOP *newop;
b2ffa427 1148
87d7fd28 1149 NewOp(1101, newop, 1, UNOP);
349fd7b7
GS		 1150 newop->op_type = OP_RV2CV;
1151 newop->op_ppaddr = PL_ppaddr[OP_RV2CV];
5f66b61c 1152 newop->op_first = NULL;
87d7fd28
GS		 1153 newop->op_next = (OP*)newop;
1154 kid->op_sibling = (OP*)newop;
349fd7b7 1155 newop->op_private |= OPpLVAL_INTRO;
e26df76a 1156 newop->op_private &= ~1;
cd06dffe
GS		 1157 break;
1158 }
b2ffa427 1159
cd06dffe
GS		 1160 if (kid->op_type != OP_RV2CV)
1161 Perl_croak(aTHX_
1162 "panic: unexpected lvalue entersub "
55140b79 1163 "entry via type/targ %ld:%"UVuf,
3d811634 1164 (long)kid->op_type, (UV)kid->op_targ);
cd06dffe
GS		 1165 kid->op_private |= OPpLVAL_INTRO;
1166 break; /* Postpone until runtime */
1167 }
b2ffa427
NIS		 1168
1169 okid = kid;
cd06dffe
GS		 1170 kid = kUNOP->op_first;
1171 if (kid->op_type == OP_NULL && kid->op_targ == OP_RV2SV)
1172 kid = kUNOP->op_first;
b2ffa427 1173 if (kid->op_type == OP_NULL)
cd06dffe
GS		 1174 Perl_croak(aTHX_
1175 "Unexpected constant lvalue entersub "
55140b79 1176 "entry via type/targ %ld:%"UVuf,
3d811634 1177 (long)kid->op_type, (UV)kid->op_targ);
cd06dffe
GS		 1178 if (kid->op_type != OP_GV) {
1179 /* Restore RV2CV to check lvalueness */
1180 restore_2cv:
1181 if (kid->op_next && kid->op_next != kid) { /* Happens? */
1182 okid->op_next = kid->op_next;
1183 kid->op_next = okid;
1184 }
1185 else
5f66b61c 1186 okid->op_next = NULL;
cd06dffe
GS		 1187 okid->op_type = OP_RV2CV;
1188 okid->op_targ = 0;
1189 okid->op_ppaddr = PL_ppaddr[OP_RV2CV];
1190 okid->op_private |= OPpLVAL_INTRO;
e26df76a 1191 okid->op_private &= ~1;
cd06dffe
GS		 1192 break;
1193 }
b2ffa427 1194
638eceb6 1195 cv = GvCV(kGVOP_gv);
1c846c1f 1196 if (!cv)
cd06dffe
GS		 1197 goto restore_2cv;
1198 if (CvLVALUE(cv))
1199 break;
1200 }
1201 }
79072805
LW		 1202 /* FALL THROUGH */
1203 default:
a0d0e21e 1204 nomod:
6fbb66d6
NC		 1205 /* grep, foreach, subcalls, refgen */
1206 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
a0d0e21e 1207 break;
cea2e8a9 1208 yyerror(Perl_form(aTHX_ "Can't modify %s in %s",
638bc118 1209 (o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL)
cd06dffe
GS		 1210 ? "do block"
1211 : (o->op_type == OP_ENTERSUB
1212 ? "non-lvalue subroutine call"
53e06cf0 1213 : OP_DESC(o))),
22c35a8c 1214 type ? PL_op_desc[type] : "local"));
11343788 1215 return o;
79072805 1216
a0d0e21e
LW		 1217 case OP_PREINC:
1218 case OP_PREDEC:
1219 case OP_POW:
1220 case OP_MULTIPLY:
1221 case OP_DIVIDE:
1222 case OP_MODULO:
1223 case OP_REPEAT:
1224 case OP_ADD:
1225 case OP_SUBTRACT:
1226 case OP_CONCAT:
1227 case OP_LEFT_SHIFT:
1228 case OP_RIGHT_SHIFT:
1229 case OP_BIT_AND:
1230 case OP_BIT_XOR:
1231 case OP_BIT_OR:
1232 case OP_I_MULTIPLY:
1233 case OP_I_DIVIDE:
1234 case OP_I_MODULO:
1235 case OP_I_ADD:
1236 case OP_I_SUBTRACT:
11343788 1237 if (!(o->op_flags & OPf_STACKED))
a0d0e21e 1238 goto nomod;
3280af22 1239 PL_modcount++;
a0d0e21e 1240 break;
b2ffa427 1241
79072805 1242 case OP_COND_EXPR:
ddeae0f1 1243 localize = 1;
11343788 1244 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1245 mod(kid, type);
79072805
LW		 1246 break;
1247
1248 case OP_RV2AV:
1249 case OP_RV2HV:
11343788 1250 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
e6438c1a 1251 PL_modcount = RETURN_UNLIMITED_NUMBER;
11343788 1252 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1253 }
1254 /* FALL THROUGH */
79072805 1255 case OP_RV2GV:
5dc0d613 1256 if (scalar_mod_type(o, type))
3fe9a6f1 1257 goto nomod;
11343788 1258 ref(cUNOPo->op_first, o->op_type);
79072805 1259 /* FALL THROUGH */
79072805
LW		 1260 case OP_ASLICE:
1261 case OP_HSLICE:
78f9721b
SM		 1262 if (type == OP_LEAVESUBLV)
1263 o->op_private |= OPpMAYBE_LVSUB;
ddeae0f1 1264 localize = 1;
78f9721b
SM		 1265 /* FALL THROUGH */
1266 case OP_AASSIGN:
93a17b20
LW		 1267 case OP_NEXTSTATE:
1268 case OP_DBSTATE:
e6438c1a 1269 PL_modcount = RETURN_UNLIMITED_NUMBER;
79072805 1270 break;
463ee0b2 1271 case OP_RV2SV:
aeea060c 1272 ref(cUNOPo->op_first, o->op_type);
ddeae0f1 1273 localize = 1;
463ee0b2 1274 /* FALL THROUGH */
79072805 1275 case OP_GV:
463ee0b2 1276 case OP_AV2ARYLEN:
3280af22 1277 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1278 case OP_SASSIGN:
bf4b1e52
GS		 1279 case OP_ANDASSIGN:
1280 case OP_ORASSIGN:
c963b151 1281 case OP_DORASSIGN:
ddeae0f1
DM		 1282 PL_modcount++;
1283 break;
1284
8990e307 1285 case OP_AELEMFAST:
6a077020 1286 localize = -1;
3280af22 1287 PL_modcount++;
8990e307
LW		 1288 break;
1289
748a9306
LW		 1290 case OP_PADAV:
1291 case OP_PADHV:
e6438c1a 1292 PL_modcount = RETURN_UNLIMITED_NUMBER;
5196be3e
MB		 1293 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1294 return o; /* Treat \(@foo) like ordinary list. */
1295 if (scalar_mod_type(o, type))
3fe9a6f1 1296 goto nomod;
78f9721b
SM		 1297 if (type == OP_LEAVESUBLV)
1298 o->op_private |= OPpMAYBE_LVSUB;
748a9306
LW		 1299 /* FALL THROUGH */
1300 case OP_PADSV:
3280af22 1301 PL_modcount++;
ddeae0f1 1302 if (!type) /* local() */
cea2e8a9 1303 Perl_croak(aTHX_ "Can't localize lexical variable %s",
dd2155a4 1304 PAD_COMPNAME_PV(o->op_targ));
463ee0b2
LW		 1305 break;
1306
748a9306 1307 case OP_PUSHMARK:
ddeae0f1 1308 localize = 0;
748a9306 1309 break;
b2ffa427 1310
69969c6f
SB		 1311 case OP_KEYS:
1312 if (type != OP_SASSIGN)
1313 goto nomod;
5d82c453
GA		 1314 goto lvalue_func;
1315 case OP_SUBSTR:
1316 if (o->op_private == 4) /* don't allow 4 arg substr as lvalue */
1317 goto nomod;
5f05dabc 1318 /* FALL THROUGH */
a0d0e21e 1319 case OP_POS:
463ee0b2 1320 case OP_VEC:
78f9721b
SM		 1321 if (type == OP_LEAVESUBLV)
1322 o->op_private |= OPpMAYBE_LVSUB;
5d82c453 1323 lvalue_func:
11343788
MB		 1324 pad_free(o->op_targ);
1325 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1326 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1327 if (o->op_flags & OPf_KIDS)
1328 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1329 break;
a0d0e21e 1330
463ee0b2
LW		 1331 case OP_AELEM:
1332 case OP_HELEM:
11343788 1333 ref(cBINOPo->op_first, o->op_type);
68dc0745 1334 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1335 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1336 o->op_private |= OPpLVAL_DEFER;
78f9721b
SM		 1337 if (type == OP_LEAVESUBLV)
1338 o->op_private |= OPpMAYBE_LVSUB;
ddeae0f1 1339 localize = 1;
3280af22 1340 PL_modcount++;
463ee0b2
LW		 1341 break;
1342
1343 case OP_SCOPE:
1344 case OP_LEAVE:
1345 case OP_ENTER:
78f9721b 1346 case OP_LINESEQ:
ddeae0f1 1347 localize = 0;
11343788
MB		 1348 if (o->op_flags & OPf_KIDS)
1349 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1350 break;
1351
1352 case OP_NULL:
ddeae0f1 1353 localize = 0;
638bc118
GS		 1354 if (o->op_flags & OPf_SPECIAL) /* do BLOCK */
1355 goto nomod;
1356 else if (!(o->op_flags & OPf_KIDS))
463ee0b2 1357 break;
11343788
MB		 1358 if (o->op_targ != OP_LIST) {
1359 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1360 break;
1361 }
1362 /* FALL THROUGH */
463ee0b2 1363 case OP_LIST:
ddeae0f1 1364 localize = 0;
11343788 1365 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1366 mod(kid, type);
1367 break;
78f9721b
SM		 1368
1369 case OP_RETURN:
1370 if (type != OP_LEAVESUBLV)
1371 goto nomod;
1372 break; /* mod()ing was handled by ck_return() */
463ee0b2 1373 }
58d95175 1374
8be1be90
AMS		 1375 /* [20011101.069] File test operators interpret OPf_REF to mean that
1376 their argument is a filehandle; thus \stat(".") should not set
1377 it. AMS 20011102 */
1378 if (type == OP_REFGEN &&
1379 PL_check[o->op_type] == MEMBER_TO_FPTR(Perl_ck_ftst))
1380 return o;
1381
1382 if (type != OP_LEAVESUBLV)
1383 o->op_flags |= OPf_MOD;
1384
1385 if (type == OP_AASSIGN || type == OP_SASSIGN)
1386 o->op_flags |= OPf_SPECIAL|OPf_REF;
ddeae0f1
DM		 1387 else if (!type) { /* local() */
1388 switch (localize) {
1389 case 1:
1390 o->op_private |= OPpLVAL_INTRO;
1391 o->op_flags &= ~OPf_SPECIAL;
1392 PL_hints |= HINT_BLOCK_SCOPE;
1393 break;
1394 case 0:
1395 break;
1396 case -1:
1397 if (ckWARN(WARN_SYNTAX)) {
1398 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
1399 "Useless localization of %s", OP_DESC(o));
1400 }
1401 }
463ee0b2 1402 }
8be1be90
AMS		 1403 else if (type != OP_GREPSTART && type != OP_ENTERSUB
1404 && type != OP_LEAVESUBLV)
1405 o->op_flags |= OPf_REF;
11343788 1406 return o;
463ee0b2
LW		 1407}
1408
864dbfa3 1409STATIC bool
5f66b61c 1410S_scalar_mod_type(const OP *o, I32 type)
3fe9a6f1 1411{
1412 switch (type) {
1413 case OP_SASSIGN:
5196be3e 1414 if (o->op_type == OP_RV2GV)
3fe9a6f1 1415 return FALSE;
1416 /* FALL THROUGH */
1417 case OP_PREINC:
1418 case OP_PREDEC:
1419 case OP_POSTINC:
1420 case OP_POSTDEC:
1421 case OP_I_PREINC:
1422 case OP_I_PREDEC:
1423 case OP_I_POSTINC:
1424 case OP_I_POSTDEC:
1425 case OP_POW:
1426 case OP_MULTIPLY:
1427 case OP_DIVIDE:
1428 case OP_MODULO:
1429 case OP_REPEAT:
1430 case OP_ADD:
1431 case OP_SUBTRACT:
1432 case OP_I_MULTIPLY:
1433 case OP_I_DIVIDE:
1434 case OP_I_MODULO:
1435 case OP_I_ADD:
1436 case OP_I_SUBTRACT:
1437 case OP_LEFT_SHIFT:
1438 case OP_RIGHT_SHIFT:
1439 case OP_BIT_AND:
1440 case OP_BIT_XOR:
1441 case OP_BIT_OR:
1442 case OP_CONCAT:
1443 case OP_SUBST:
1444 case OP_TRANS:
49e9fbe6
GS		 1445 case OP_READ:
1446 case OP_SYSREAD:
1447 case OP_RECV:
bf4b1e52
GS		 1448 case OP_ANDASSIGN:
1449 case OP_ORASSIGN:
3fe9a6f1 1450 return TRUE;
1451 default:
1452 return FALSE;
1453 }
1454}
1455
35cd451c 1456STATIC bool
5f66b61c 1457S_is_handle_constructor(const OP *o, I32 numargs)
35cd451c
GS		 1458{
1459 switch (o->op_type) {
1460 case OP_PIPE_OP:
1461 case OP_SOCKPAIR:
504618e9 1462 if (numargs == 2)
35cd451c
GS		 1463 return TRUE;
1464 /* FALL THROUGH */
1465 case OP_SYSOPEN:
1466 case OP_OPEN:
ded8aa31 1467 case OP_SELECT: /* XXX c.f. SelectSaver.pm */
35cd451c
GS		 1468 case OP_SOCKET:
1469 case OP_OPEN_DIR:
1470 case OP_ACCEPT:
504618e9 1471 if (numargs == 1)
35cd451c 1472 return TRUE;
5f66b61c 1473 /* FALLTHROUGH */
35cd451c
GS		 1474 default:
1475 return FALSE;
1476 }
1477}
1478
463ee0b2 1479OP *
864dbfa3 1480Perl_refkids(pTHX_ OP *o, I32 type)
463ee0b2 1481{
11343788 1482 if (o && o->op_flags & OPf_KIDS) {
6867be6d 1483 OP *kid;
11343788 1484 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1485 ref(kid, type);
1486 }
11343788 1487 return o;
463ee0b2
LW		 1488}
1489
1490OP *
e4c5ccf3 1491Perl_doref(pTHX_ OP *o, I32 type, bool set_op_ref)
463ee0b2 1492{
27da23d5 1493 dVAR;
463ee0b2 1494 OP *kid;
463ee0b2 1495
3280af22 1496 if (!o || PL_error_count)
11343788 1497 return o;
463ee0b2 1498
11343788 1499 switch (o->op_type) {
a0d0e21e 1500 case OP_ENTERSUB:
afebc493 1501 if ((type == OP_EXISTS || type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1502 !(o->op_flags & OPf_STACKED)) {
1503 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1504 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788 1505 assert(cUNOPo->op_first->op_type == OP_NULL);
93c66552 1506 op_null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
11343788 1507 o->op_flags |= OPf_SPECIAL;
e26df76a 1508 o->op_private &= ~1;
8990e307
LW		 1509 }
1510 break;
aeea060c 1511
463ee0b2 1512 case OP_COND_EXPR:
11343788 1513 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
e4c5ccf3 1514 doref(kid, type, set_op_ref);
463ee0b2 1515 break;
8990e307 1516 case OP_RV2SV:
35cd451c
GS		 1517 if (type == OP_DEFINED)
1518 o->op_flags |= OPf_SPECIAL; /* don't create GV */
e4c5ccf3 1519 doref(cUNOPo->op_first, o->op_type, set_op_ref);
4633a7c4
LW		 1520 /* FALL THROUGH */
1521 case OP_PADSV:
5f05dabc 1522 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1523 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1524 : type == OP_RV2HV ? OPpDEREF_HV
1525 : OPpDEREF_SV);
11343788 1526 o->op_flags |= OPf_MOD;
a0d0e21e 1527 }
8990e307 1528 break;
1c846c1f 1529
2faa37cc 1530 case OP_THREADSV:
a863c7d1
MB		 1531 o->op_flags |= OPf_MOD; /* XXX ??? */
1532 break;
1533
463ee0b2
LW		 1534 case OP_RV2AV:
1535 case OP_RV2HV:
e4c5ccf3
RH		 1536 if (set_op_ref)
1537 o->op_flags |= OPf_REF;
8990e307 1538 /* FALL THROUGH */
463ee0b2 1539 case OP_RV2GV:
35cd451c
GS		 1540 if (type == OP_DEFINED)
1541 o->op_flags |= OPf_SPECIAL; /* don't create GV */
e4c5ccf3 1542 doref(cUNOPo->op_first, o->op_type, set_op_ref);
463ee0b2 1543 break;
8990e307 1544
463ee0b2
LW		 1545 case OP_PADAV:
1546 case OP_PADHV:
e4c5ccf3
RH		 1547 if (set_op_ref)
1548 o->op_flags |= OPf_REF;
79072805 1549 break;
aeea060c 1550
8990e307 1551 case OP_SCALAR:
79072805 1552 case OP_NULL:
11343788 1553 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1554 break;
e4c5ccf3 1555 doref(cBINOPo->op_first, type, set_op_ref);
79072805
LW		 1556 break;
1557 case OP_AELEM:
1558 case OP_HELEM:
e4c5ccf3 1559 doref(cBINOPo->op_first, o->op_type, set_op_ref);
5f05dabc 1560 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1561 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1562 : type == OP_RV2HV ? OPpDEREF_HV
1563 : OPpDEREF_SV);
11343788 1564 o->op_flags |= OPf_MOD;
8990e307 1565 }
79072805
LW		 1566 break;
1567
463ee0b2 1568 case OP_SCOPE:
79072805 1569 case OP_LEAVE:
e4c5ccf3
RH		 1570 set_op_ref = FALSE;
1571 /* FALL THROUGH */
79072805 1572 case OP_ENTER:
8990e307 1573 case OP_LIST:
11343788 1574 if (!(o->op_flags & OPf_KIDS))
79072805 1575 break;
e4c5ccf3 1576 doref(cLISTOPo->op_last, type, set_op_ref);
79072805 1577 break;
a0d0e21e
LW		 1578 default:
1579 break;
79072805 1580 }
11343788 1581 return scalar(o);
8990e307 1582
79072805
LW		 1583}
1584
09bef843
SB		 1585STATIC OP *
1586S_dup_attrlist(pTHX_ OP *o)
1587{
97aff369 1588 dVAR;
0bd48802 1589 OP *rop;
09bef843
SB		 1590
1591 /* An attrlist is either a simple OP_CONST or an OP_LIST with kids,
1592 * where the first kid is OP_PUSHMARK and the remaining ones
1593 * are OP_CONST. We need to push the OP_CONST values.
1594 */
1595 if (o->op_type == OP_CONST)
b37c2d43 1596 rop = newSVOP(OP_CONST, o->op_flags, SvREFCNT_inc_NN(cSVOPo->op_sv));
eb8433b7
NC		 1597#ifdef PERL_MAD
1598 else if (o->op_type == OP_NULL)
1d866c12 1599 rop = NULL;
eb8433b7 1600#endif
09bef843
SB		 1601 else {
1602 assert((o->op_type == OP_LIST) && (o->op_flags & OPf_KIDS));
5f66b61c 1603 rop = NULL;
09bef843
SB		 1604 for (o = cLISTOPo->op_first; o; o=o->op_sibling) {
1605 if (o->op_type == OP_CONST)
1606 rop = append_elem(OP_LIST, rop,
1607 newSVOP(OP_CONST, o->op_flags,
b37c2d43 1608 SvREFCNT_inc_NN(cSVOPo->op_sv)));
09bef843
SB		 1609 }
1610 }
1611 return rop;
1612}
1613
1614STATIC void
95f0a2f1 1615S_apply_attrs(pTHX_ HV *stash, SV *target, OP *attrs, bool for_my)
09bef843 1616{
27da23d5 1617 dVAR;
09bef843
SB		 1618 SV *stashsv;
1619
1620 /* fake up C<use attributes $pkg,$rv,@attrs> */
1621 ENTER; /* need to protect against side-effects of 'use' */
1622 SAVEINT(PL_expect);
5aaec2b4 1623 stashsv = stash ? newSVhek(HvNAME_HEK(stash)) : &PL_sv_no;
e4783991 1624
09bef843 1625#define ATTRSMODULE "attributes"
95f0a2f1
SB		 1626#define ATTRSMODULE_PM "attributes.pm"
1627
1628 if (for_my) {
95f0a2f1 1629 /* Don't force the C<use> if we don't need it. */
a4fc7abc 1630 SV * const * const svp = hv_fetchs(GvHVn(PL_incgv), ATTRSMODULE_PM, FALSE);
95f0a2f1 1631 if (svp && *svp != &PL_sv_undef)
6f207bd3 1632 NOOP; /* already in %INC */
95f0a2f1
SB		 1633 else
1634 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
6136c704 1635 newSVpvs(ATTRSMODULE), NULL);
95f0a2f1
SB		 1636 }
1637 else {
1638 Perl_load_module(aTHX_ PERL_LOADMOD_IMPORT_OPS,
6136c704
AL		 1639 newSVpvs(ATTRSMODULE),
1640 NULL,
95f0a2f1
SB		 1641 prepend_elem(OP_LIST,
1642 newSVOP(OP_CONST, 0, stashsv),
1643 prepend_elem(OP_LIST,
1644 newSVOP(OP_CONST, 0,
1645 newRV(target)),
1646 dup_attrlist(attrs))));
1647 }
09bef843
SB		 1648 LEAVE;
1649}
1650
95f0a2f1
SB		 1651STATIC void
1652S_apply_attrs_my(pTHX_ HV *stash, OP *target, OP *attrs, OP **imopsp)
1653{
97aff369 1654 dVAR;
95f0a2f1
SB		 1655 OP *pack, *imop, *arg;
1656 SV *meth, *stashsv;
1657
1658 if (!attrs)
1659 return;
1660
1661 assert(target->op_type == OP_PADSV ||
1662 target->op_type == OP_PADHV ||
1663 target->op_type == OP_PADAV);
1664
1665 /* Ensure that attributes.pm is loaded. */
dd2155a4 1666 apply_attrs(stash, PAD_SV(target->op_targ), attrs, TRUE);
95f0a2f1
SB		 1667
1668 /* Need package name for method call. */
6136c704 1669 pack = newSVOP(OP_CONST, 0, newSVpvs(ATTRSMODULE));
95f0a2f1
SB		 1670
1671 /* Build up the real arg-list. */
5aaec2b4
NC		 1672 stashsv = stash ? newSVhek(HvNAME_HEK(stash)) : &PL_sv_no;
1673
95f0a2f1
SB		 1674 arg = newOP(OP_PADSV, 0);
1675 arg->op_targ = target->op_targ;
1676 arg = prepend_elem(OP_LIST,
1677 newSVOP(OP_CONST, 0, stashsv),
1678 prepend_elem(OP_LIST,
1679 newUNOP(OP_REFGEN, 0,
1680 mod(arg, OP_REFGEN)),
1681 dup_attrlist(attrs)));
1682
1683 /* Fake up a method call to import */
18916d0d 1684 meth = newSVpvs_share("import");
95f0a2f1
SB		 1685 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL|OPf_WANT_VOID,
1686 append_elem(OP_LIST,
1687 prepend_elem(OP_LIST, pack, list(arg)),
1688 newSVOP(OP_METHOD_NAMED, 0, meth)));
1689 imop->op_private |= OPpENTERSUB_NOMOD;
1690
1691 /* Combine the ops. */
1692 *imopsp = append_elem(OP_LIST, *imopsp, imop);
1693}
1694
1695/*
1696=notfor apidoc apply_attrs_string
1697
1698Attempts to apply a list of attributes specified by the C<attrstr> and
1699C<len> arguments to the subroutine identified by the C<cv> argument which
1700is expected to be associated with the package identified by the C<stashpv>
1701argument (see L<attributes>). It gets this wrong, though, in that it
1702does not correctly identify the boundaries of the individual attribute
1703specifications within C<attrstr>. This is not really intended for the
1704public API, but has to be listed here for systems such as AIX which
1705need an explicit export list for symbols. (It's called from XS code
1706in support of the C<ATTRS:> keyword from F<xsubpp>.) Patches to fix it
1707to respect attribute syntax properly would be welcome.
1708
1709=cut
1710*/
1711
be3174d2 1712void
6867be6d
AL		 1713Perl_apply_attrs_string(pTHX_ const char *stashpv, CV *cv,
1714 const char *attrstr, STRLEN len)
be3174d2 1715{
5f66b61c 1716 OP *attrs = NULL;
be3174d2
GS		 1717
1718 if (!len) {
1719 len = strlen(attrstr);
1720 }
1721
1722 while (len) {
1723 for (; isSPACE(*attrstr) && len; --len, ++attrstr) ;
1724 if (len) {
890ce7af 1725 const char * const sstr = attrstr;
be3174d2
GS		 1726 for (; !isSPACE(*attrstr) && len; --len, ++attrstr) ;
1727 attrs = append_elem(OP_LIST, attrs,
1728 newSVOP(OP_CONST, 0,
1729 newSVpvn(sstr, attrstr-sstr)));
1730 }
1731 }
1732
1733 Perl_load_module(aTHX_ PERL_LOADMOD_IMPORT_OPS,
6136c704 1734 newSVpvs(ATTRSMODULE),
a0714e2c 1735 NULL, prepend_elem(OP_LIST,
be3174d2
GS		 1736 newSVOP(OP_CONST, 0, newSVpv(stashpv,0)),
1737 prepend_elem(OP_LIST,
1738 newSVOP(OP_CONST, 0,
1739 newRV((SV*)cv)),
1740 attrs)));
1741}
1742
09bef843 1743STATIC OP *
95f0a2f1 1744S_my_kid(pTHX_ OP *o, OP *attrs, OP **imopsp)
93a17b20 1745{
97aff369 1746 dVAR;
93a17b20
LW		 1747 I32 type;
1748
3280af22 1749 if (!o || PL_error_count)
11343788 1750 return o;
93a17b20 1751
bc61e325 1752 type = o->op_type;
eb8433b7
NC		 1753 if (PL_madskills && type == OP_NULL && o->op_flags & OPf_KIDS) {
1754 (void)my_kid(cUNOPo->op_first, attrs, imopsp);
1755 return o;
1756 }
1757
93a17b20 1758 if (type == OP_LIST) {
6867be6d 1759 OP *kid;
11343788 1760 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
95f0a2f1 1761 my_kid(kid, attrs, imopsp);
eb8433b7
NC		 1762 } else if (type == OP_UNDEF
1763#ifdef PERL_MAD
1764 || type == OP_STUB
1765#endif
1766 ) {
7766148a 1767 return o;
77ca0c92
LW		 1768 } else if (type == OP_RV2SV || /* "our" declaration */
1769 type == OP_RV2AV ||
1770 type == OP_RV2HV) { /* XXX does this let anything illegal in? */
1ce0b88c
RGS		 1771 if (cUNOPo->op_first->op_type != OP_GV) { /* MJD 20011224 */
1772 yyerror(Perl_form(aTHX_ "Can't declare %s in %s",
952306ac
RGS		 1773 OP_DESC(o),
1774 PL_in_my == KEY_our ? "our" : PL_in_my == KEY_state ? "state" : "my"));
1ce0b88c 1775 } else if (attrs) {
551405c4 1776 GV * const gv = cGVOPx_gv(cUNOPo->op_first);
1ce0b88c 1777 PL_in_my = FALSE;
5c284bb0 1778 PL_in_my_stash = NULL;
1ce0b88c
RGS		 1779 apply_attrs(GvSTASH(gv),
1780 (type == OP_RV2SV ? GvSV(gv) :
1781 type == OP_RV2AV ? (SV*)GvAV(gv) :
1782 type == OP_RV2HV ? (SV*)GvHV(gv) : (SV*)gv),
1783 attrs, FALSE);
1784 }
192587c2 1785 o->op_private |= OPpOUR_INTRO;
77ca0c92 1786 return o;
95f0a2f1
SB		 1787 }
1788 else if (type != OP_PADSV &&
93a17b20
LW		 1789 type != OP_PADAV &&
1790 type != OP_PADHV &&
1791 type != OP_PUSHMARK)
1792 {
eb64745e 1793 yyerror(Perl_form(aTHX_ "Can't declare %s in \"%s\"",
53e06cf0 1794 OP_DESC(o),
952306ac 1795 PL_in_my == KEY_our ? "our" : PL_in_my == KEY_state ? "state" : "my"));
11343788 1796 return o;
93a17b20 1797 }
09bef843
SB		 1798 else if (attrs && type != OP_PUSHMARK) {
1799 HV *stash;
09bef843 1800
eb64745e 1801 PL_in_my = FALSE;
5c284bb0 1802 PL_in_my_stash = NULL;
eb64745e 1803
09bef843 1804 /* check for C<my Dog $spot> when deciding package */
dd2155a4
DM		 1805 stash = PAD_COMPNAME_TYPE(o->op_targ);
1806 if (!stash)
09bef843 1807 stash = PL_curstash;
95f0a2f1 1808 apply_attrs_my(stash, o, attrs, imopsp);
09bef843 1809 }
11343788
MB		 1810 o->op_flags |= OPf_MOD;
1811 o->op_private |= OPpLVAL_INTRO;
952306ac
RGS		 1812 if (PL_in_my == KEY_state)
1813 o->op_private |= OPpPAD_STATE;
11343788 1814 return o;
93a17b20
LW		 1815}
1816
1817OP *
09bef843
SB		 1818Perl_my_attrs(pTHX_ OP *o, OP *attrs)
1819{
97aff369 1820 dVAR;
0bd48802 1821 OP *rops;
95f0a2f1
SB		 1822 int maybe_scalar = 0;
1823
d2be0de5 1824/* [perl #17376]: this appears to be premature, and results in code such as
c754c3d7 1825 C< our(%x); > executing in list mode rather than void mode */
d2be0de5 1826#if 0
09bef843
SB		 1827 if (o->op_flags & OPf_PARENS)
1828 list(o);
95f0a2f1
SB		 1829 else
1830 maybe_scalar = 1;
d2be0de5
YST		 1831#else
1832 maybe_scalar = 1;
1833#endif
09bef843
SB		 1834 if (attrs)
1835 SAVEFREEOP(attrs);
5f66b61c 1836 rops = NULL;
95f0a2f1
SB		 1837 o = my_kid(o, attrs, &rops);
1838 if (rops) {
1839 if (maybe_scalar && o->op_type == OP_PADSV) {
1840 o = scalar(append_list(OP_LIST, (LISTOP*)rops, (LISTOP*)o));
1841 o->op_private |= OPpLVAL_INTRO;
1842 }
1843 else
1844 o = append_list(OP_LIST, (LISTOP*)o, (LISTOP*)rops);
1845 }
eb64745e 1846 PL_in_my = FALSE;
5c284bb0 1847 PL_in_my_stash = NULL;
eb64745e 1848 return o;
09bef843
SB		 1849}
1850
1851OP *
1852Perl_my(pTHX_ OP *o)
1853{
5f66b61c 1854 return my_attrs(o, NULL);
09bef843
SB		 1855}
1856
1857OP *
864dbfa3 1858Perl_sawparens(pTHX_ OP *o)
79072805 1859{
96a5add6 1860 PERL_UNUSED_CONTEXT;
79072805
LW		 1861 if (o)
1862 o->op_flags |= OPf_PARENS;
1863 return o;
1864}
1865
1866OP *
864dbfa3 1867Perl_bind_match(pTHX_ I32 type, OP *left, OP *right)
79072805 1868{
11343788 1869 OP *o;
59f00321 1870 bool ismatchop = 0;
1496a290
AL		 1871 const OPCODE ltype = left->op_type;
1872 const OPCODE rtype = right->op_type;
79072805 1873
1496a290
AL		 1874 if ( (ltype == OP_RV2AV || ltype == OP_RV2HV || ltype == OP_PADAV
1875 || ltype == OP_PADHV) && ckWARN(WARN_MISC))
041457d9 1876 {
1496a290
AL		 1877 const char * const desc
1878 = PL_op_desc[(rtype == OP_SUBST || rtype == OP_TRANS)
1879 ? rtype : OP_MATCH];
1880 const char * const sample = ((ltype == OP_RV2AV || ltype == OP_PADAV)
1881 ? "@array" : "%hash");
9014280d 1882 Perl_warner(aTHX_ packWARN(WARN_MISC),
1c846c1f 1883 "Applying %s to %s will act on scalar(%s)",
599cee73 1884 desc, sample, sample);
2ae324a7 1885 }
1886
1496a290 1887 if (rtype == OP_CONST &&
5cc9e5c9
RH		 1888 cSVOPx(right)->op_private & OPpCONST_BARE &&
1889 cSVOPx(right)->op_private & OPpCONST_STRICT)
1890 {
1891 no_bareword_allowed(right);
1892 }
1893
1496a290
AL		 1894 ismatchop = rtype == OP_MATCH ||
1895 rtype == OP_SUBST ||
1896 rtype == OP_TRANS;
59f00321
RGS		 1897 if (ismatchop && right->op_private & OPpTARGET_MY) {
1898 right->op_targ = 0;
1899 right->op_private &= ~OPpTARGET_MY;
1900 }
1901 if (!(right->op_flags & OPf_STACKED) && ismatchop) {
1496a290
AL		 1902 OP *newleft;
1903
79072805 1904 right->op_flags |= OPf_STACKED;
1496a290
AL		 1905 if (rtype != OP_MATCH &&
1906 ! (rtype == OP_TRANS &&
6fbb66d6 1907 right->op_private & OPpTRANS_IDENTICAL))
1496a290
AL		 1908 newleft = mod(left, rtype);
1909 else
1910 newleft = left;
79072805 1911 if (right->op_type == OP_TRANS)
1496a290 1912 o = newBINOP(OP_NULL, OPf_STACKED, scalar(newleft), right);
79072805 1913 else
1496a290 1914 o = prepend_elem(rtype, scalar(newleft), right);
79072805 1915 if (type == OP_NOT)
11343788
MB		 1916 return newUNOP(OP_NOT, 0, scalar(o));
1917 return o;
79072805
LW		 1918 }
1919 else
1920 return bind_match(type, left,
131b3ad0 1921 pmruntime(newPMOP(OP_MATCH, 0), right, 0));
79072805
LW		 1922}
1923
1924OP *
864dbfa3 1925Perl_invert(pTHX_ OP *o)
79072805 1926{
11343788 1927 if (!o)
1d866c12 1928 return NULL;
11343788 1929 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1930}
1931
1932OP *
864dbfa3 1933Perl_scope(pTHX_ OP *o)
79072805 1934{
27da23d5 1935 dVAR;
79072805 1936 if (o) {
3280af22 1937 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || PL_tainting) {
463ee0b2
LW		 1938 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1939 o->op_type = OP_LEAVE;
22c35a8c 1940 o->op_ppaddr = PL_ppaddr[OP_LEAVE];
463ee0b2 1941 }
fdb22418
HS		 1942 else if (o->op_type == OP_LINESEQ) {
1943 OP *kid;
1944 o->op_type = OP_SCOPE;
1945 o->op_ppaddr = PL_ppaddr[OP_SCOPE];
1946 kid = ((LISTOP*)o)->op_first;
59110972 1947 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) {
fdb22418 1948 op_null(kid);
59110972
RH		 1949
1950 /* The following deals with things like 'do {1 for 1}' */
1951 kid = kid->op_sibling;
1952 if (kid &&
1953 (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE))
1954 op_null(kid);
1955 }
463ee0b2 1956 }
fdb22418 1957 else
5f66b61c 1958 o = newLISTOP(OP_SCOPE, 0, o, NULL);
79072805
LW		 1959 }
1960 return o;
1961}
72dc9ed5 1962
a0d0e21e 1963int
864dbfa3 1964Perl_block_start(pTHX_ int full)
79072805 1965{
97aff369 1966 dVAR;
73d840c0 1967 const int retval = PL_savestack_ix;
dd2155a4 1968 pad_block_start(full);
b3ac6de7 1969 SAVEHINTS();
3280af22 1970 PL_hints &= ~HINT_BLOCK_SCOPE;
68da3b2f 1971 SAVECOMPILEWARNINGS();
72dc9ed5 1972 PL_compiling.cop_warnings = DUP_WARNINGS(PL_compiling.cop_warnings);
a0d0e21e
LW		 1973 return retval;
1974}
1975
1976OP*
864dbfa3 1977Perl_block_end(pTHX_ I32 floor, OP *seq)
a0d0e21e 1978{
97aff369 1979 dVAR;
6867be6d 1980 const int needblockscope = PL_hints & HINT_BLOCK_SCOPE;
551405c4 1981 OP* const retval = scalarseq(seq);
e9818f4e 1982 LEAVE_SCOPE(floor);
623e6609 1983 CopHINTS_set(&PL_compiling, PL_hints);
a0d0e21e 1984 if (needblockscope)
3280af22 1985 PL_hints |= HINT_BLOCK_SCOPE; /* propagate out */
dd2155a4 1986 pad_leavemy();
a0d0e21e
LW		 1987 return retval;
1988}
1989
76e3520e 1990STATIC OP *
cea2e8a9 1991S_newDEFSVOP(pTHX)
54b9620d 1992{
97aff369 1993 dVAR;
9f7d9405 1994 const PADOFFSET offset = pad_findmy("$_");
00b1698f 1995 if (offset == NOT_IN_PAD || PAD_COMPNAME_FLAGS_isOUR(offset)) {
59f00321
RGS		 1996 return newSVREF(newGVOP(OP_GV, 0, PL_defgv));
1997 }
1998 else {
551405c4 1999 OP * const o = newOP(OP_PADSV, 0);
59f00321
RGS		 2000 o->op_targ = offset;
2001 return o;
2002 }
54b9620d
MB		 2003}
2004
a0d0e21e 2005void
864dbfa3 2006Perl_newPROG(pTHX_ OP *o)
a0d0e21e 2007{
97aff369 2008 dVAR;
3280af22 2009 if (PL_in_eval) {
b295d113
TH		 2010 if (PL_eval_root)
2011 return;
faef0170
HS		 2012 PL_eval_root = newUNOP(OP_LEAVEEVAL,
2013 ((PL_in_eval & EVAL_KEEPERR)
2014 ? OPf_SPECIAL : 0), o);
3280af22 2015 PL_eval_start = linklist(PL_eval_root);
7934575e
GS		 2016 PL_eval_root->op_private |= OPpREFCOUNTED;
2017 OpREFCNT_set(PL_eval_root, 1);
3280af22 2018 PL_eval_root->op_next = 0;
a2efc822 2019 CALL_PEEP(PL_eval_start);
a0d0e21e
LW		 2020 }
2021 else {
6be89cf9
AE		 2022 if (o->op_type == OP_STUB) {
2023 PL_comppad_name = 0;
2024 PL_compcv = 0;
2a4f803a 2025 FreeOp(o);
a0d0e21e 2026 return;
6be89cf9 2027 }
3280af22
NIS		 2028 PL_main_root = scope(sawparens(scalarvoid(o)));
2029 PL_curcop = &PL_compiling;
2030 PL_main_start = LINKLIST(PL_main_root);
7934575e
GS		 2031 PL_main_root->op_private |= OPpREFCOUNTED;
2032 OpREFCNT_set(PL_main_root, 1);
3280af22 2033 PL_main_root->op_next = 0;
a2efc822 2034 CALL_PEEP(PL_main_start);
3280af22 2035 PL_compcv = 0;
3841441e 2036
4fdae800 2037 /* Register with debugger */
84902520 2038 if (PERLDB_INTER) {
551405c4 2039 CV * const cv = get_cv("DB::postponed", FALSE);
3841441e
CS		 2040 if (cv) {
2041 dSP;
924508f0 2042 PUSHMARK(SP);
cc49e20b 2043 XPUSHs((SV*)CopFILEGV(&PL_compiling));
3841441e 2044 PUTBACK;
864dbfa3 2045 call_sv((SV*)cv, G_DISCARD);
3841441e
CS		 2046 }
2047 }
79072805 2048 }
79072805
LW		 2049}
2050
2051OP *
864dbfa3 2052Perl_localize(pTHX_ OP *o, I32 lex)
79072805 2053{
97aff369 2054 dVAR;
79072805 2055 if (o->op_flags & OPf_PARENS)
d2be0de5
YST		 2056/* [perl #17376]: this appears to be premature, and results in code such as
2057 C< our(%x); > executing in list mode rather than void mode */
2058#if 0
79072805 2059 list(o);
d2be0de5 2060#else
6f207bd3 2061 NOOP;
d2be0de5 2062#endif
8990e307 2063 else {
041457d9
DM		 2064 if ( PL_bufptr > PL_oldbufptr && PL_bufptr[-1] == ','
2065 && ckWARN(WARN_PARENTHESIS))
64420d0d
JH		 2066 {
2067 char *s = PL_bufptr;
bac662ee 2068 bool sigil = FALSE;
64420d0d 2069
8473848f 2070 /* some heuristics to detect a potential error */
bac662ee 2071 while (*s && (strchr(", \t\n", *s)))
64420d0d 2072 s++;
8473848f 2073
bac662ee
TS		 2074 while (1) {
2075 if (*s && strchr("@$%*", *s) && *++s
2076 && (isALNUM(*s) || UTF8_IS_CONTINUED(*s))) {
2077 s++;
2078 sigil = TRUE;
2079 while (*s && (isALNUM(*s) || UTF8_IS_CONTINUED(*s)))
2080 s++;
2081 while (*s && (strchr(", \t\n", *s)))
2082 s++;
2083 }
2084 else
2085 break;
2086 }
2087 if (sigil && (*s == ';' || *s == '=')) {
2088 Perl_warner(aTHX_ packWARN(WARN_PARENTHESIS),
8473848f 2089 "Parentheses missing around \"%s\" list",
952306ac 2090 lex ? (PL_in_my == KEY_our ? "our" : PL_in_my == KEY_state ? "state" : "my")
8473848f
RGS		 2091 : "local");
2092 }
8990e307
LW		 2093 }
2094 }
93a17b20 2095 if (lex)
eb64745e 2096 o = my(o);
93a17b20 2097 else
eb64745e
GS		 2098 o = mod(o, OP_NULL); /* a bit kludgey */
2099 PL_in_my = FALSE;
5c284bb0 2100 PL_in_my_stash = NULL;
eb64745e 2101 return o;
79072805
LW		 2102}
2103
2104OP *
864dbfa3 2105Perl_jmaybe(pTHX_ OP *o)
79072805
LW		 2106{
2107 if (o->op_type == OP_LIST) {
fafc274c 2108 OP * const o2
d4c19fe8 2109 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpvs(";", GV_ADD|GV_NOTQUAL, SVt_PV)));
554b3eca 2110 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 2111 }
2112 return o;
2113}
2114
2115OP *
864dbfa3 2116Perl_fold_constants(pTHX_ register OP *o)
79072805 2117{
27da23d5 2118 dVAR;
79072805 2119 register OP *curop;
eb8433b7 2120 OP *newop;
6148ee25 2121 volatile I32 type = o->op_type;
de5e01c2 2122 SV *sv = NULL;
b7f7fd0b
NC		 2123 int ret = 0;
2124 I32 oldscope;
2125 OP *old_next;
5f2d9966
DM		 2126 SV * const oldwarnhook = PL_warnhook;
2127 SV * const olddiehook = PL_diehook;
b7f7fd0b 2128 dJMPENV;
79072805 2129
22c35a8c 2130 if (PL_opargs[type] & OA_RETSCALAR)
79072805 2131 scalar(o);
b162f9ea 2132 if (PL_opargs[type] & OA_TARGET && !o->op_targ)
ed6116ce 2133 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 2134
eac055e9
GS		 2135 /* integerize op, unless it happens to be C<-foo>.
2136 * XXX should pp_i_negate() do magic string negation instead? */
2137 if ((PL_opargs[type] & OA_OTHERINT) && (PL_hints & HINT_INTEGER)
2138 && !(type == OP_NEGATE && cUNOPo->op_first->op_type == OP_CONST
2139 && (cUNOPo->op_first->op_private & OPpCONST_BARE)))
2140 {
22c35a8c 2141 o->op_ppaddr = PL_ppaddr[type = ++(o->op_type)];
eac055e9 2142 }
85e6fe83 2143
22c35a8c 2144 if (!(PL_opargs[type] & OA_FOLDCONST))
79072805
LW		 2145 goto nope;
2146
de939608 2147 switch (type) {
7a52d87a
GS		 2148 case OP_NEGATE:
2149 /* XXX might want a ck_negate() for this */
2150 cUNOPo->op_first->op_private &= ~OPpCONST_STRICT;
2151 break;
de939608
CS		 2152 case OP_UCFIRST:
2153 case OP_LCFIRST:
2154 case OP_UC:
2155 case OP_LC:
69dcf70c
MB		 2156 case OP_SLT:
2157 case OP_SGT:
2158 case OP_SLE:
2159 case OP_SGE:
2160 case OP_SCMP:
2de3dbcc
JH		 2161 /* XXX what about the numeric ops? */
2162 if (PL_hints & HINT_LOCALE)
de939608
CS		 2163 goto nope;
2164 }
2165
3280af22 2166 if (PL_error_count)
a0d0e21e
LW		 2167 goto nope; /* Don't try to run w/ errors */
2168
79072805 2169 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
1496a290
AL		 2170 const OPCODE type = curop->op_type;
2171 if ((type != OP_CONST || (curop->op_private & OPpCONST_BARE)) &&
2172 type != OP_LIST &&
2173 type != OP_SCALAR &&
2174 type != OP_NULL &&
2175 type != OP_PUSHMARK)
7a52d87a 2176 {
79072805
LW		 2177 goto nope;
2178 }
2179 }
2180
2181 curop = LINKLIST(o);
b7f7fd0b 2182 old_next = o->op_next;
79072805 2183 o->op_next = 0;
533c011a 2184 PL_op = curop;
b7f7fd0b
NC		 2185
2186 oldscope = PL_scopestack_ix;
edb2152a 2187 create_eval_scope(G_FAKINGEVAL);
b7f7fd0b 2188
5f2d9966
DM		 2189 PL_warnhook = PERL_WARNHOOK_FATAL;
2190 PL_diehook = NULL;
b7f7fd0b
NC		 2191 JMPENV_PUSH(ret);
2192
2193 switch (ret) {
2194 case 0:
2195 CALLRUNOPS(aTHX);
2196 sv = *(PL_stack_sp--);
2197 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
2198 pad_swipe(o->op_targ, FALSE);
2199 else if (SvTEMP(sv)) { /* grab mortal temp? */
2200 SvREFCNT_inc_simple_void(sv);
2201 SvTEMP_off(sv);
2202 }
2203 break;
2204 case 3:
2205 /* Something tried to die. Abandon constant folding. */
2206 /* Pretend the error never happened. */
2207 sv_setpvn(ERRSV,"",0);
2208 o->op_next = old_next;
2209 break;
2210 default:
2211 JMPENV_POP;
5f2d9966
DM		 2212 /* Don't expect 1 (setjmp failed) or 2 (something called my_exit) */
2213 PL_warnhook = oldwarnhook;
2214 PL_diehook = olddiehook;
2215 /* XXX note that this croak may fail as we've already blown away
2216 * the stack - eg any nested evals */
b7f7fd0b
NC		 2217 Perl_croak(aTHX_ "panic: fold_constants JMPENV_PUSH returned %d", ret);
2218 }
b7f7fd0b 2219 JMPENV_POP;
5f2d9966
DM		 2220 PL_warnhook = oldwarnhook;
2221 PL_diehook = olddiehook;
edb2152a
NC		 2222
2223 if (PL_scopestack_ix > oldscope)
2224 delete_eval_scope();
eb8433b7 2225
b7f7fd0b
NC		 2226 if (ret)
2227 goto nope;
2228
eb8433b7 2229#ifndef PERL_MAD
79072805 2230 op_free(o);
eb8433b7 2231#endif
de5e01c2 2232 assert(sv);
79072805 2233 if (type == OP_RV2GV)
eb8433b7
NC		 2234 newop = newGVOP(OP_GV, 0, (GV*)sv);
2235 else
2236 newop = newSVOP(OP_CONST, 0, sv);
2237 op_getmad(o,newop,'f');
2238 return newop;
aeea060c 2239
b7f7fd0b 2240 nope:
79072805
LW		 2241 return o;
2242}
2243
2244OP *
864dbfa3 2245Perl_gen_constant_list(pTHX_ register OP *o)
79072805 2246{
27da23d5 2247 dVAR;
79072805 2248 register OP *curop;
6867be6d 2249 const I32 oldtmps_floor = PL_tmps_floor;
79072805 2250
a0d0e21e 2251 list(o);
3280af22 2252 if (PL_error_count)
a0d0e21e
LW		 2253 return o; /* Don't attempt to run with errors */
2254
533c011a 2255 PL_op = curop = LINKLIST(o);
a0d0e21e 2256 o->op_next = 0;
a2efc822 2257 CALL_PEEP(curop);
cea2e8a9
GS		 2258 pp_pushmark();
2259 CALLRUNOPS(aTHX);
533c011a 2260 PL_op = curop;
cea2e8a9 2261 pp_anonlist();
3280af22 2262 PL_tmps_floor = oldtmps_floor;
79072805
LW		 2263
2264 o->op_type = OP_RV2AV;
22c35a8c 2265 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
fb53bbb2
SG		 2266 o->op_flags &= ~OPf_REF; /* treat \(1..2) like an ordinary list */
2267 o->op_flags |= OPf_PARENS; /* and flatten \(1..2,3) */
2814eb74 2268 o->op_opt = 0; /* needs to be revisited in peep() */
79072805 2269 curop = ((UNOP*)o)->op_first;
b37c2d43 2270 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc_NN(*PL_stack_sp--));
eb8433b7
NC		 2271#ifdef PERL_MAD
2272 op_getmad(curop,o,'O');
2273#else
79072805 2274 op_free(curop);
eb8433b7 2275#endif
79072805
LW		 2276 linklist(o);
2277 return list(o);
2278}
2279
2280OP *
864dbfa3 2281Perl_convert(pTHX_ I32 type, I32 flags, OP *o)
79072805 2282{
27da23d5 2283 dVAR;
11343788 2284 if (!o || o->op_type != OP_LIST)
5f66b61c 2285 o = newLISTOP(OP_LIST, 0, o, NULL);
748a9306 2286 else
5dc0d613 2287 o->op_flags &= ~OPf_WANT;
79072805 2288
22c35a8c 2289 if (!(PL_opargs[type] & OA_MARK))
93c66552 2290 op_null(cLISTOPo->op_first);
8990e307 2291
eb160463 2292 o->op_type = (OPCODE)type;
22c35a8c 2293 o->op_ppaddr = PL_ppaddr[type];
11343788 2294 o->op_flags |= flags;
79072805 2295
11343788 2296 o = CHECKOP(type, o);
fe2774ed 2297 if (o->op_type != (unsigned)type)
11343788 2298 return o;
79072805 2299
11343788 2300 return fold_constants(o);
79072805
LW		 2301}
2302
2303/* List constructors */
2304
2305OP *
864dbfa3 2306Perl_append_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2307{
2308 if (!first)
2309 return last;
8990e307
LW		 2310
2311 if (!last)
79072805 2312 return first;
8990e307 2313
fe2774ed 2314 if (first->op_type != (unsigned)type
155aba94
GS		 2315 || (type == OP_LIST && (first->op_flags & OPf_PARENS)))
2316 {
2317 return newLISTOP(type, 0, first, last);
2318 }
79072805 2319
a0d0e21e
LW		 2320 if (first->op_flags & OPf_KIDS)
2321 ((LISTOP*)first)->op_last->op_sibling = last;
2322 else {
2323 first->op_flags |= OPf_KIDS;
2324 ((LISTOP*)first)->op_first = last;
2325 }
2326 ((LISTOP*)first)->op_last = last;
a0d0e21e 2327 return first;
79072805
LW		 2328}
2329
2330OP *
864dbfa3 2331Perl_append_list(pTHX_ I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 2332{
2333 if (!first)
2334 return (OP*)last;
8990e307
LW		 2335
2336 if (!last)
79072805 2337 return (OP*)first;
8990e307 2338
fe2774ed 2339 if (first->op_type != (unsigned)type)
79072805 2340 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307 2341
fe2774ed 2342 if (last->op_type != (unsigned)type)
79072805
LW		 2343 return append_elem(type, (OP*)first, (OP*)last);
2344
2345 first->op_last->op_sibling = last->op_first;
2346 first->op_last = last->op_last;
117dada2 2347 first->op_flags |= (last->op_flags & OPf_KIDS);
1c846c1f 2348
eb8433b7
NC		 2349#ifdef PERL_MAD
2350 if (last->op_first && first->op_madprop) {
2351 MADPROP *mp = last->op_first->op_madprop;
2352 if (mp) {
2353 while (mp->mad_next)
2354 mp = mp->mad_next;
2355 mp->mad_next = first->op_madprop;
2356 }
2357 else {
2358 last->op_first->op_madprop = first->op_madprop;
2359 }
2360 }
2361 first->op_madprop = last->op_madprop;
2362 last->op_madprop = 0;
2363#endif
2364
238a4c30
NIS		 2365 FreeOp(last);
2366
79072805
LW		 2367 return (OP*)first;
2368}
2369
2370OP *
864dbfa3 2371Perl_prepend_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2372{
2373 if (!first)
2374 return last;
8990e307
LW		 2375
2376 if (!last)
79072805 2377 return first;
8990e307 2378
fe2774ed 2379 if (last->op_type == (unsigned)type) {
8990e307
LW		 2380 if (type == OP_LIST) { /* already a PUSHMARK there */
2381 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
2382 ((LISTOP*)last)->op_first->op_sibling = first;
36a5d4ba
DC		 2383 if (!(first->op_flags & OPf_PARENS))
2384 last->op_flags &= ~OPf_PARENS;
8990e307
LW		 2385 }
2386 else {
2387 if (!(last->op_flags & OPf_KIDS)) {
2388 ((LISTOP*)last)->op_last = first;
2389 last->op_flags |= OPf_KIDS;
2390 }
2391 first->op_sibling = ((LISTOP*)last)->op_first;
2392 ((LISTOP*)last)->op_first = first;
79072805 2393 }
117dada2 2394 last->op_flags |= OPf_KIDS;
79072805
LW		 2395 return last;
2396 }
2397
2398 return newLISTOP(type, 0, first, last);
2399}
2400
2401/* Constructors */
2402
eb8433b7
NC		 2403#ifdef PERL_MAD
2404
2405TOKEN *
2406Perl_newTOKEN(pTHX_ I32 optype, YYSTYPE lval, MADPROP* madprop)
2407{
2408 TOKEN *tk;
99129197 2409 Newxz(tk, 1, TOKEN);
eb8433b7
NC		 2410 tk->tk_type = (OPCODE)optype;
2411 tk->tk_type = 12345;
2412 tk->tk_lval = lval;
2413 tk->tk_mad = madprop;
2414 return tk;
2415}
2416
2417void
2418Perl_token_free(pTHX_ TOKEN* tk)
2419{
2420 if (tk->tk_type != 12345)
2421 return;
2422 mad_free(tk->tk_mad);
2423 Safefree(tk);
2424}
2425
2426void
2427Perl_token_getmad(pTHX_ TOKEN* tk, OP* o, char slot)
2428{
2429 MADPROP* mp;
2430 MADPROP* tm;
2431 if (tk->tk_type != 12345) {
2432 Perl_warner(aTHX_ packWARN(WARN_MISC),
2433 "Invalid TOKEN object ignored");
2434 return;
2435 }
2436 tm = tk->tk_mad;
2437 if (!tm)
2438 return;
2439
2440 /* faked up qw list? */
2441 if (slot == '(' &&
2442 tm->mad_type == MAD_SV &&
2443 SvPVX((SV*)tm->mad_val)[0] == 'q')
2444 slot = 'x';
2445
2446 if (o) {
2447 mp = o->op_madprop;
2448 if (mp) {
2449 for (;;) {
2450 /* pretend constant fold didn't happen? */
2451 if (mp->mad_key == 'f' &&
2452 (o->op_type == OP_CONST ||
2453 o->op_type == OP_GV) )
2454 {
2455 token_getmad(tk,(OP*)mp->mad_val,slot);
2456 return;
2457 }
2458 if (!mp->mad_next)
2459 break;
2460 mp = mp->mad_next;
2461 }
2462 mp->mad_next = tm;
2463 mp = mp->mad_next;
2464 }
2465 else {
2466 o->op_madprop = tm;
2467 mp = o->op_madprop;
2468 }
2469 if (mp->mad_key == 'X')
2470 mp->mad_key = slot; /* just change the first one */
2471
2472 tk->tk_mad = 0;
2473 }
2474 else
2475 mad_free(tm);
2476 Safefree(tk);
2477}
2478
2479void
2480Perl_op_getmad_weak(pTHX_ OP* from, OP* o, char slot)
2481{
2482 MADPROP* mp;
2483 if (!from)
2484 return;
2485 if (o) {
2486 mp = o->op_madprop;
2487 if (mp) {
2488 for (;;) {
2489 /* pretend constant fold didn't happen? */
2490 if (mp->mad_key == 'f' &&
2491 (o->op_type == OP_CONST ||
2492 o->op_type == OP_GV) )
2493 {
2494 op_getmad(from,(OP*)mp->mad_val,slot);
2495 return;
2496 }
2497 if (!mp->mad_next)
2498 break;
2499 mp = mp->mad_next;
2500 }
2501 mp->mad_next = newMADPROP(slot,MAD_OP,from,0);
2502 }
2503 else {
2504 o->op_madprop = newMADPROP(slot,MAD_OP,from,0);
2505 }
2506 }
2507}
2508
2509void
2510Perl_op_getmad(pTHX_ OP* from, OP* o, char slot)
2511{
2512 MADPROP* mp;
2513 if (!from)
2514 return;
2515 if (o) {
2516 mp = o->op_madprop;
2517 if (mp) {
2518 for (;;) {
2519 /* pretend constant fold didn't happen? */
2520 if (mp->mad_key == 'f' &&
2521 (o->op_type == OP_CONST ||
2522 o->op_type == OP_GV) )
2523 {
2524 op_getmad(from,(OP*)mp->mad_val,slot);
2525 return;
2526 }
2527 if (!mp->mad_next)
2528 break;
2529 mp = mp->mad_next;
2530 }
2531 mp->mad_next = newMADPROP(slot,MAD_OP,from,1);
2532 }
2533 else {
2534 o->op_madprop = newMADPROP(slot,MAD_OP,from,1);
2535 }
2536 }
2537 else {
99129197
NC		 2538 PerlIO_printf(PerlIO_stderr(),
2539 "DESTROYING op = %0"UVxf"\n", PTR2UV(from));
eb8433b7
NC		 2540 op_free(from);
2541 }
2542}
2543
2544void
2545Perl_prepend_madprops(pTHX_ MADPROP* mp, OP* o, char slot)
2546{
2547 MADPROP* tm;
2548 if (!mp || !o)
2549 return;
2550 if (slot)
2551 mp->mad_key = slot;
2552 tm = o->op_madprop;
2553 o->op_madprop = mp;
2554 for (;;) {
2555 if (!mp->mad_next)
2556 break;
2557 mp = mp->mad_next;
2558 }
2559 mp->mad_next = tm;
2560}
2561
2562void
2563Perl_append_madprops(pTHX_ MADPROP* tm, OP* o, char slot)
2564{
2565 if (!o)
2566 return;
2567 addmad(tm, &(o->op_madprop), slot);
2568}
2569
2570void
2571Perl_addmad(pTHX_ MADPROP* tm, MADPROP** root, char slot)
2572{
2573 MADPROP* mp;
2574 if (!tm || !root)
2575 return;
2576 if (slot)
2577 tm->mad_key = slot;
2578 mp = *root;
2579 if (!mp) {
2580 *root = tm;
2581 return;
2582 }
2583 for (;;) {
2584 if (!mp->mad_next)
2585 break;
2586 mp = mp->mad_next;
2587 }
2588 mp->mad_next = tm;
2589}
2590
2591MADPROP *
2592Perl_newMADsv(pTHX_ char key, SV* sv)
2593{
2594 return newMADPROP(key, MAD_SV, sv, 0);
2595}
2596
2597MADPROP *
2598Perl_newMADPROP(pTHX_ char key, char type, void* val, I32 vlen)
2599{
2600 MADPROP *mp;
99129197 2601 Newxz(mp, 1, MADPROP);
eb8433b7
NC		 2602 mp->mad_next = 0;
2603 mp->mad_key = key;
2604 mp->mad_vlen = vlen;
2605 mp->mad_type = type;
2606 mp->mad_val = val;
2607/* PerlIO_printf(PerlIO_stderr(), "NEW mp = %0x\n", mp); */
2608 return mp;
2609}
2610
2611void
2612Perl_mad_free(pTHX_ MADPROP* mp)
2613{
2614/* PerlIO_printf(PerlIO_stderr(), "FREE mp = %0x\n", mp); */
2615 if (!mp)
2616 return;
2617 if (mp->mad_next)
2618 mad_free(mp->mad_next);
2619/* if (PL_lex_state != LEX_NOTPARSING && mp->mad_vlen)
2620 PerlIO_printf(PerlIO_stderr(), "DESTROYING '%c'=<%s>\n", mp->mad_key & 255, mp->mad_val); */
2621 switch (mp->mad_type) {
2622 case MAD_NULL:
2623 break;
2624 case MAD_PV:
2625 Safefree((char*)mp->mad_val);
2626 break;
2627 case MAD_OP:
2628 if (mp->mad_vlen) /* vlen holds "strong/weak" boolean */
2629 op_free((OP*)mp->mad_val);
2630 break;
2631 case MAD_SV:
2632 sv_free((SV*)mp->mad_val);
2633 break;
2634 default:
2635 PerlIO_printf(PerlIO_stderr(), "Unrecognized mad\n");
2636 break;
2637 }
2638 Safefree(mp);
2639}
2640
2641#endif
2642
79072805 2643OP *
864dbfa3 2644Perl_newNULLLIST(pTHX)
79072805 2645{
8990e307
LW		 2646 return newOP(OP_STUB, 0);
2647}
2648
2649OP *
864dbfa3 2650Perl_force_list(pTHX_ OP *o)
8990e307 2651{
11343788 2652 if (!o || o->op_type != OP_LIST)
5f66b61c 2653 o = newLISTOP(OP_LIST, 0, o, NULL);
93c66552 2654 op_null(o);
11343788 2655 return o;
79072805
LW		 2656}
2657
2658OP *
864dbfa3 2659Perl_newLISTOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805 2660{
27da23d5 2661 dVAR;
79072805
LW		 2662 LISTOP *listop;
2663
b7dc083c 2664 NewOp(1101, listop, 1, LISTOP);
79072805 2665
eb160463 2666 listop->op_type = (OPCODE)type;
22c35a8c 2667 listop->op_ppaddr = PL_ppaddr[type];
117dada2
SM		 2668 if (first || last)
2669 flags |= OPf_KIDS;
eb160463 2670 listop->op_flags = (U8)flags;
79072805
LW		 2671
2672 if (!last && first)
2673 last = first;
2674 else if (!first && last)
2675 first = last;
8990e307
LW		 2676 else if (first)
2677 first->op_sibling = last;
79072805
LW		 2678 listop->op_first = first;
2679 listop->op_last = last;
8990e307 2680 if (type == OP_LIST) {
551405c4 2681 OP* const pushop = newOP(OP_PUSHMARK, 0);
8990e307
LW		 2682 pushop->op_sibling = first;
2683 listop->op_first = pushop;
2684 listop->op_flags |= OPf_KIDS;
2685 if (!last)
2686 listop->op_last = pushop;
2687 }
79072805 2688
463d09e6 2689 return CHECKOP(type, listop);
79072805
LW		 2690}
2691
2692OP *
864dbfa3 2693Perl_newOP(pTHX_ I32 type, I32 flags)
79072805 2694{
27da23d5 2695 dVAR;
11343788 2696 OP *o;
b7dc083c 2697 NewOp(1101, o, 1, OP);
eb160463 2698 o->op_type = (OPCODE)type;
22c35a8c 2699 o->op_ppaddr = PL_ppaddr[type];
eb160463 2700 o->op_flags = (U8)flags;
79072805 2701
11343788 2702 o->op_next = o;
eb160463 2703 o->op_private = (U8)(0 | (flags >> 8));
22c35a8c 2704 if (PL_opargs[type] & OA_RETSCALAR)
11343788 2705 scalar(o);
22c35a8c 2706 if (PL_opargs[type] & OA_TARGET)
11343788
MB		 2707 o->op_targ = pad_alloc(type, SVs_PADTMP);
2708 return CHECKOP(type, o);
79072805
LW		 2709}
2710
2711OP *
864dbfa3 2712Perl_newUNOP(pTHX_ I32 type, I32 flags, OP *first)
79072805 2713{
27da23d5 2714 dVAR;
79072805
LW		 2715 UNOP *unop;
2716
93a17b20 2717 if (!first)
aeea060c 2718 first = newOP(OP_STUB, 0);
22c35a8c 2719 if (PL_opargs[type] & OA_MARK)
8990e307 2720 first = force_list(first);
93a17b20 2721
b7dc083c 2722 NewOp(1101, unop, 1, UNOP);
eb160463 2723 unop->op_type = (OPCODE)type;
22c35a8c 2724 unop->op_ppaddr = PL_ppaddr[type];
79072805 2725 unop->op_first = first;
585ec06d 2726 unop->op_flags = (U8)(flags | OPf_KIDS);
eb160463 2727 unop->op_private = (U8)(1 | (flags >> 8));
e50aee73 2728 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 2729 if (unop->op_next)
2730 return (OP*)unop;
2731
a0d0e21e 2732 return fold_constants((OP *) unop);
79072805
LW		 2733}
2734
2735OP *
864dbfa3 2736Perl_newBINOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805 2737{
27da23d5 2738 dVAR;
79072805 2739 BINOP *binop;
b7dc083c 2740 NewOp(1101, binop, 1, BINOP);
79072805
LW		 2741
2742 if (!first)
2743 first = newOP(OP_NULL, 0);
2744
eb160463 2745 binop->op_type = (OPCODE)type;
22c35a8c 2746 binop->op_ppaddr = PL_ppaddr[type];
79072805 2747 binop->op_first = first;
585ec06d 2748 binop->op_flags = (U8)(flags | OPf_KIDS);
79072805
LW		 2749 if (!last) {
2750 last = first;
eb160463 2751 binop->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 2752 }
2753 else {
eb160463 2754 binop->op_private = (U8)(2 | (flags >> 8));
79072805
LW		 2755 first->op_sibling = last;
2756 }
2757
e50aee73 2758 binop = (BINOP*)CHECKOP(type, binop);
eb160463 2759 if (binop->op_next || binop->op_type != (OPCODE)type)
79072805
LW		 2760 return (OP*)binop;
2761
7284ab6f 2762 binop->op_last = binop->op_first->op_sibling;
79072805 2763
a0d0e21e 2764 return fold_constants((OP *)binop);
79072805
LW		 2765}
2766
5f66b61c
AL		 2767static int uvcompare(const void *a, const void *b)
2768 __attribute__nonnull__(1)
2769 __attribute__nonnull__(2)
2770 __attribute__pure__;
abb2c242 2771static int uvcompare(const void *a, const void *b)
2b9d42f0 2772{
e1ec3a88 2773 if (*((const UV *)a) < (*(const UV *)b))
2b9d42f0 2774 return -1;
e1ec3a88 2775 if (*((const UV *)a) > (*(const UV *)b))
2b9d42f0 2776 return 1;
e1ec3a88 2777 if (*((const UV *)a+1) < (*(const UV *)b+1))
2b9d42f0 2778 return -1;
e1ec3a88 2779 if (*((const UV *)a+1) > (*(const UV *)b+1))
2b9d42f0 2780 return 1;
a0ed51b3
LW		 2781 return 0;
2782}
2783
79072805 2784OP *
864dbfa3 2785Perl_pmtrans(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2786{
97aff369 2787 dVAR;
2d03de9c
AL		 2788 SV * const tstr = ((SVOP*)expr)->op_sv;
2789 SV * const rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 2790 STRLEN tlen;
2791 STRLEN rlen;
5c144d81
NC		 2792 const U8 *t = (U8*)SvPV_const(tstr, tlen);
2793 const U8 *r = (U8*)SvPV_const(rstr, rlen);
79072805
LW		 2794 register I32 i;
2795 register I32 j;
9b877dbb 2796 I32 grows = 0;
79072805
LW		 2797 register short *tbl;
2798
551405c4
AL		 2799 const I32 complement = o->op_private & OPpTRANS_COMPLEMENT;
2800 const I32 squash = o->op_private & OPpTRANS_SQUASH;
2801 I32 del = o->op_private & OPpTRANS_DELETE;
800b4dc4 2802 PL_hints |= HINT_BLOCK_SCOPE;
1c846c1f 2803
036b4402
GS		 2804 if (SvUTF8(tstr))
2805 o->op_private |= OPpTRANS_FROM_UTF;
1c846c1f
NIS		 2806
2807 if (SvUTF8(rstr))
036b4402 2808 o->op_private |= OPpTRANS_TO_UTF;
79072805 2809
a0ed51b3 2810 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
396482e1 2811 SV* const listsv = newSVpvs("# comment\n");
c445ea15 2812 SV* transv = NULL;
5c144d81
NC		 2813 const U8* tend = t + tlen;
2814 const U8* rend = r + rlen;
ba210ebe 2815 STRLEN ulen;
84c133a0
RB		 2816 UV tfirst = 1;
2817 UV tlast = 0;
2818 IV tdiff;
2819 UV rfirst = 1;
2820 UV rlast = 0;
2821 IV rdiff;
2822 IV diff;
a0ed51b3
LW		 2823 I32 none = 0;
2824 U32 max = 0;
2825 I32 bits;
a0ed51b3 2826 I32 havefinal = 0;
9c5ffd7c 2827 U32 final = 0;
551405c4
AL		 2828 const I32 from_utf = o->op_private & OPpTRANS_FROM_UTF;
2829 const I32 to_utf = o->op_private & OPpTRANS_TO_UTF;
bf4a1e57
JH		 2830 U8* tsave = NULL;
2831 U8* rsave = NULL;
9f7f3913 2832 const U32 flags = UTF8_ALLOW_DEFAULT;
bf4a1e57
JH		 2833
2834 if (!from_utf) {
2835 STRLEN len = tlen;
5c144d81 2836 t = tsave = bytes_to_utf8(t, &len);
bf4a1e57
JH		 2837 tend = t + len;
2838 }
2839 if (!to_utf && rlen) {
2840 STRLEN len = rlen;
5c144d81 2841 r = rsave = bytes_to_utf8(r, &len);
bf4a1e57
JH		 2842 rend = r + len;
2843 }
a0ed51b3 2844
2b9d42f0
NIS		 2845/* There are several snags with this code on EBCDIC:
2846 1. 0xFF is a legal UTF-EBCDIC byte (there are no illegal bytes).
2847 2. scan_const() in toke.c has encoded chars in native encoding which makes
2848 ranges at least in EBCDIC 0..255 range the bottom odd.
2849*/
2850
a0ed51b3 2851 if (complement) {
89ebb4a3 2852 U8 tmpbuf[UTF8_MAXBYTES+1];
2b9d42f0 2853 UV *cp;
a0ed51b3 2854 UV nextmin = 0;
a02a5408 2855 Newx(cp, 2*tlen, UV);
a0ed51b3 2856 i = 0;
396482e1 2857 transv = newSVpvs("");
a0ed51b3 2858 while (t < tend) {
9f7f3913 2859 cp[2*i] = utf8n_to_uvuni(t, tend-t, &ulen, flags);
2b9d42f0
NIS		 2860 t += ulen;
2861 if (t < tend && NATIVE_TO_UTF(*t) == 0xff) {
a0ed51b3 2862 t++;
9f7f3913 2863 cp[2*i+1] = utf8n_to_uvuni(t, tend-t, &ulen, flags);
2b9d42f0 2864 t += ulen;
a0ed51b3 2865 }
2b9d42f0
NIS		 2866 else {
2867 cp[2*i+1] = cp[2*i];
2868 }
2869 i++;
a0ed51b3 2870 }
2b9d42f0 2871 qsort(cp, i, 2*sizeof(UV), uvcompare);
a0ed51b3 2872 for (j = 0; j < i; j++) {
2b9d42f0 2873 UV val = cp[2*j];
a0ed51b3
LW		 2874 diff = val - nextmin;
2875 if (diff > 0) {
9041c2e3 2876 t = uvuni_to_utf8(tmpbuf,nextmin);
dfe13c55 2877 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3 2878 if (diff > 1) {
2b9d42f0 2879 U8 range_mark = UTF_TO_NATIVE(0xff);
9041c2e3 2880 t = uvuni_to_utf8(tmpbuf, val - 1);
2b9d42f0 2881 sv_catpvn(transv, (char *)&range_mark, 1);
dfe13c55 2882 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2883 }
2884 }
2b9d42f0 2885 val = cp[2*j+1];
a0ed51b3
LW		 2886 if (val >= nextmin)
2887 nextmin = val + 1;
2888 }
9041c2e3 2889 t = uvuni_to_utf8(tmpbuf,nextmin);
dfe13c55 2890 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
2b9d42f0
NIS		 2891 {
2892 U8 range_mark = UTF_TO_NATIVE(0xff);
2893 sv_catpvn(transv, (char *)&range_mark, 1);
2894 }
b851fbc1
JH		 2895 t = uvuni_to_utf8_flags(tmpbuf, 0x7fffffff,
2896 UNICODE_ALLOW_SUPER);
dfe13c55 2897 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
93524f2b 2898 t = (const U8*)SvPVX_const(transv);
a0ed51b3
LW		 2899 tlen = SvCUR(transv);
2900 tend = t + tlen;
455d824a 2901 Safefree(cp);
a0ed51b3
LW		 2902 }
2903 else if (!rlen && !del) {
2904 r = t; rlen = tlen; rend = tend;
4757a243
LW		 2905 }
2906 if (!squash) {
05d340b8 2907 if ((!rlen && !del) || t == r ||
12ae5dfc 2908 (tlen == rlen && memEQ((char *)t, (char *)r, tlen)))
01ec43d0 2909 {
4757a243 2910 o->op_private |= OPpTRANS_IDENTICAL;
01ec43d0 2911 }
a0ed51b3
LW		 2912 }
2913
2914 while (t < tend || tfirst <= tlast) {
2915 /* see if we need more "t" chars */
2916 if (tfirst > tlast) {
9f7f3913 2917 tfirst = (I32)utf8n_to_uvuni(t, tend - t, &ulen, flags);
a0ed51b3 2918 t += ulen;
2b9d42f0 2919 if (t < tend && NATIVE_TO_UTF(*t) == 0xff) { /* illegal utf8 val indicates range */
ba210ebe 2920 t++;
9f7f3913 2921 tlast = (I32)utf8n_to_uvuni(t, tend - t, &ulen, flags);
a0ed51b3
LW		 2922 t += ulen;
2923 }
2924 else
2925 tlast = tfirst;
2926 }
2927
2928 /* now see if we need more "r" chars */
2929 if (rfirst > rlast) {
2930 if (r < rend) {
9f7f3913 2931 rfirst = (I32)utf8n_to_uvuni(r, rend - r, &ulen, flags);
a0ed51b3 2932 r += ulen;
2b9d42f0 2933 if (r < rend && NATIVE_TO_UTF(*r) == 0xff) { /* illegal utf8 val indicates range */
ba210ebe 2934 r++;
9f7f3913 2935 rlast = (I32)utf8n_to_uvuni(r, rend - r, &ulen, flags);
a0ed51b3
LW		 2936 r += ulen;
2937 }
2938 else
2939 rlast = rfirst;
2940 }
2941 else {
2942 if (!havefinal++)
2943 final = rlast;
2944 rfirst = rlast = 0xffffffff;
2945 }
2946 }
2947
2948 /* now see which range will peter our first, if either. */
2949 tdiff = tlast - tfirst;
2950 rdiff = rlast - rfirst;
2951
2952 if (tdiff <= rdiff)
2953 diff = tdiff;
2954 else
2955 diff = rdiff;
2956
2957 if (rfirst == 0xffffffff) {
2958 diff = tdiff; /* oops, pretend rdiff is infinite */
2959 if (diff > 0)
894356b3
GS		 2960 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\tXXXX\n",
2961 (long)tfirst, (long)tlast);
a0ed51b3 2962 else
894356b3 2963 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\tXXXX\n", (long)tfirst);
a0ed51b3
LW		 2964 }
2965 else {
2966 if (diff > 0)
894356b3
GS		 2967 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\t%04lx\n",
2968 (long)tfirst, (long)(tfirst + diff),
2969 (long)rfirst);
a0ed51b3 2970 else
894356b3
GS		 2971 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\t%04lx\n",
2972 (long)tfirst, (long)rfirst);
a0ed51b3
LW		 2973
2974 if (rfirst + diff > max)
2975 max = rfirst + diff;
9b877dbb 2976 if (!grows)
45005bfb
JH		 2977 grows = (tfirst < rfirst &&
2978 UNISKIP(tfirst) < UNISKIP(rfirst + diff));
2979 rfirst += diff + 1;
a0ed51b3
LW		 2980 }
2981 tfirst += diff + 1;
2982 }
2983
2984 none = ++max;
2985 if (del)
2986 del = ++max;
2987
2988 if (max > 0xffff)
2989 bits = 32;
2990 else if (max > 0xff)
2991 bits = 16;
2992 else
2993 bits = 8;
2994
455d824a 2995 Safefree(cPVOPo->op_pv);
a0ed51b3
LW		 2996 cSVOPo->op_sv = (SV*)swash_init("utf8", "", listsv, bits, none);
2997 SvREFCNT_dec(listsv);
b37c2d43 2998 SvREFCNT_dec(transv);
a0ed51b3 2999
45005bfb 3000 if (!del && havefinal && rlen)
b448e4fe
JH		 3001 (void)hv_store((HV*)SvRV((cSVOPo->op_sv)), "FINAL", 5,
3002 newSVuv((UV)final), 0);
a0ed51b3 3003
9b877dbb 3004 if (grows)
a0ed51b3
LW		 3005 o->op_private |= OPpTRANS_GROWS;
3006
b37c2d43
AL		 3007 Safefree(tsave);
3008 Safefree(rsave);
9b877dbb 3009
eb8433b7
NC		 3010#ifdef PERL_MAD
3011 op_getmad(expr,o,'e');
3012 op_getmad(repl,o,'r');
3013#else
a0ed51b3
LW		 3014 op_free(expr);
3015 op_free(repl);
eb8433b7 3016#endif
a0ed51b3
LW		 3017 return o;
3018 }
3019
3020 tbl = (short*)cPVOPo->op_pv;
79072805
LW		 3021 if (complement) {
3022 Zero(tbl, 256, short);
eb160463 3023 for (i = 0; i < (I32)tlen; i++)
ec49126f 3024 tbl[t[i]] = -1;
79072805
LW		 3025 for (i = 0, j = 0; i < 256; i++) {
3026 if (!tbl[i]) {
eb160463 3027 if (j >= (I32)rlen) {
a0ed51b3 3028 if (del)
79072805
LW		 3029 tbl[i] = -2;
3030 else if (rlen)
ec49126f 3031 tbl[i] = r[j-1];
79072805 3032 else
eb160463 3033 tbl[i] = (short)i;
79072805 3034 }
9b877dbb
IH		 3035 else {
3036 if (i < 128 && r[j] >= 128)
3037 grows = 1;
ec49126f 3038 tbl[i] = r[j++];
9b877dbb 3039 }
79072805
LW		 3040 }
3041 }
05d340b8
JH		 3042 if (!del) {
3043 if (!rlen) {
3044 j = rlen;
3045 if (!squash)
3046 o->op_private |= OPpTRANS_IDENTICAL;
3047 }
eb160463 3048 else if (j >= (I32)rlen)
05d340b8
JH		 3049 j = rlen - 1;
3050 else
3051 cPVOPo->op_pv = (char*)Renew(tbl, 0x101+rlen-j, short);
585ec06d 3052 tbl[0x100] = (short)(rlen - j);
eb160463 3053 for (i=0; i < (I32)rlen - j; i++)
8973db79
JH		 3054 tbl[0x101+i] = r[j+i];
3055 }
79072805
LW		 3056 }
3057 else {
a0ed51b3 3058 if (!rlen && !del) {
79072805 3059 r = t; rlen = tlen;
5d06d08e 3060 if (!squash)
4757a243 3061 o->op_private |= OPpTRANS_IDENTICAL;
79072805 3062 }
94bfe852
RGS		 3063 else if (!squash && rlen == tlen && memEQ((char*)t, (char*)r, tlen)) {
3064 o->op_private |= OPpTRANS_IDENTICAL;
3065 }
79072805
LW		 3066 for (i = 0; i < 256; i++)
3067 tbl[i] = -1;
eb160463
GS		 3068 for (i = 0, j = 0; i < (I32)tlen; i++,j++) {
3069 if (j >= (I32)rlen) {
a0ed51b3 3070 if (del) {
ec49126f 3071 if (tbl[t[i]] == -1)
3072 tbl[t[i]] = -2;
79072805
LW		 3073 continue;
3074 }
3075 --j;
3076 }
9b877dbb
IH		 3077 if (tbl[t[i]] == -1) {
3078 if (t[i] < 128 && r[j] >= 128)
3079 grows = 1;
ec49126f 3080 tbl[t[i]] = r[j];
9b877dbb 3081 }
79072805
LW		 3082 }
3083 }
9b877dbb
IH		 3084 if (grows)
3085 o->op_private |= OPpTRANS_GROWS;
eb8433b7
NC		 3086#ifdef PERL_MAD
3087 op_getmad(expr,o,'e');
3088 op_getmad(repl,o,'r');
3089#else
79072805
LW		 3090 op_free(expr);
3091 op_free(repl);
eb8433b7 3092#endif
79072805 3093
11343788 3094 return o;
79072805
LW		 3095}
3096
3097OP *
864dbfa3 3098Perl_newPMOP(pTHX_ I32 type, I32 flags)
79072805 3099{
27da23d5 3100 dVAR;
79072805
LW		 3101 PMOP *pmop;
3102
b7dc083c 3103 NewOp(1101, pmop, 1, PMOP);
eb160463 3104 pmop->op_type = (OPCODE)type;
22c35a8c 3105 pmop->op_ppaddr = PL_ppaddr[type];
eb160463
GS		 3106 pmop->op_flags = (U8)flags;
3107 pmop->op_private = (U8)(0 | (flags >> 8));
79072805 3108
3280af22 3109 if (PL_hints & HINT_RE_TAINT)
b3eb6a9b 3110 pmop->op_pmpermflags |= PMf_RETAINT;
3280af22 3111 if (PL_hints & HINT_LOCALE)
b3eb6a9b
GS		 3112 pmop->op_pmpermflags |= PMf_LOCALE;
3113 pmop->op_pmflags = pmop->op_pmpermflags;
36477c24 3114
debc9467 3115#ifdef USE_ITHREADS
551405c4
AL		 3116 if (av_len((AV*) PL_regex_pad[0]) > -1) {
3117 SV * const repointer = av_pop((AV*)PL_regex_pad[0]);
3118 pmop->op_pmoffset = SvIV(repointer);
3119 SvREPADTMP_off(repointer);
3120 sv_setiv(repointer,0);
3121 } else {
3122 SV * const repointer = newSViv(0);
b37c2d43 3123 av_push(PL_regex_padav, SvREFCNT_inc_simple_NN(repointer));
551405c4
AL		 3124 pmop->op_pmoffset = av_len(PL_regex_padav);
3125 PL_regex_pad = AvARRAY(PL_regex_padav);
13137afc 3126 }
debc9467 3127#endif
1eb1540c 3128
1fcf4c12 3129 /* link into pm list */
3280af22 3130 if (type != OP_TRANS && PL_curstash) {
8d2f4536
NC		 3131 MAGIC *mg = mg_find((SV*)PL_curstash, PERL_MAGIC_symtab);
3132
3133 if (!mg) {
3134 mg = sv_magicext((SV*)PL_curstash, 0, PERL_MAGIC_symtab, 0, 0, 0);
3135 }
3136 pmop->op_pmnext = (PMOP*)mg->mg_obj;
3137 mg->mg_obj = (SV*)pmop;
cb55de95 3138 PmopSTASH_set(pmop,PL_curstash);
79072805
LW		 3139 }
3140
463d09e6 3141 return CHECKOP(type, pmop);
79072805
LW		 3142}
3143
131b3ad0
DM		 3144/* Given some sort of match op o, and an expression expr containing a
3145 * pattern, either compile expr into a regex and attach it to o (if it's
3146 * constant), or convert expr into a runtime regcomp op sequence (if it's
3147 * not)
3148 *
3149 * isreg indicates that the pattern is part of a regex construct, eg
3150 * $x =~ /pattern/ or split /pattern/, as opposed to $x =~ $pattern or
3151 * split "pattern", which aren't. In the former case, expr will be a list
3152 * if the pattern contains more than one term (eg /a$b/) or if it contains
3153 * a replacement, ie s/// or tr///.
3154 */
3155
79072805 3156OP *
131b3ad0 3157Perl_pmruntime(pTHX_ OP *o, OP *expr, bool isreg)
79072805 3158{
27da23d5 3159 dVAR;
79072805
LW		 3160 PMOP *pm;
3161 LOGOP *rcop;
ce862d02 3162 I32 repl_has_vars = 0;
5f66b61c 3163 OP* repl = NULL;
131b3ad0
DM		 3164 bool reglist;
3165
3166 if (o->op_type == OP_SUBST || o->op_type == OP_TRANS) {
3167 /* last element in list is the replacement; pop it */
3168 OP* kid;
3169 repl = cLISTOPx(expr)->op_last;
3170 kid = cLISTOPx(expr)->op_first;
3171 while (kid->op_sibling != repl)
3172 kid = kid->op_sibling;
5f66b61c 3173 kid->op_sibling = NULL;
131b3ad0
DM		 3174 cLISTOPx(expr)->op_last = kid;
3175 }
79072805 3176
131b3ad0
DM		 3177 if (isreg && expr->op_type == OP_LIST &&
3178 cLISTOPx(expr)->op_first->op_sibling == cLISTOPx(expr)->op_last)
3179 {
3180 /* convert single element list to element */
0bd48802 3181 OP* const oe = expr;
131b3ad0 3182 expr = cLISTOPx(oe)->op_first->op_sibling;
5f66b61c
AL		 3183 cLISTOPx(oe)->op_first->op_sibling = NULL;
3184 cLISTOPx(oe)->op_last = NULL;
131b3ad0
DM		 3185 op_free(oe);
3186 }
3187
3188 if (o->op_type == OP_TRANS) {
11343788 3189 return pmtrans(o, expr, repl);
131b3ad0
DM		 3190 }
3191
3192 reglist = isreg && expr->op_type == OP_LIST;
3193 if (reglist)
3194 op_null(expr);
79072805 3195
3280af22 3196 PL_hints |= HINT_BLOCK_SCOPE;
11343788 3197 pm = (PMOP*)o;
79072805
LW		 3198
3199 if (expr->op_type == OP_CONST) {
463ee0b2 3200 STRLEN plen;
6136c704 3201 SV * const pat = ((SVOP*)expr)->op_sv;
5c144d81 3202 const char *p = SvPV_const(pat, plen);
770526c1 3203 if ((o->op_flags & OPf_SPECIAL) && (*p == ' ' && p[1] == '\0')) {
5c144d81
NC		 3204 U32 was_readonly = SvREADONLY(pat);
3205
3206 if (was_readonly) {
3207 if (SvFAKE(pat)) {
3208 sv_force_normal_flags(pat, 0);
3209 assert(!SvREADONLY(pat));
3210 was_readonly = 0;
3211 } else {
3212 SvREADONLY_off(pat);
3213 }
3214 }
3215
93a17b20 3216 sv_setpvn(pat, "\\s+", 3);
5c144d81
NC		 3217
3218 SvFLAGS(pat) |= was_readonly;
3219
3220 p = SvPV_const(pat, plen);
79072805
LW		 3221 pm->op_pmflags |= PMf_SKIPWHITE;
3222 }
5b71a6a7 3223 if (DO_UTF8(pat))
a5961de5 3224 pm->op_pmdynflags |= PMdf_UTF8;
5c144d81
NC		 3225 /* FIXME - can we make this function take const char * args? */
3226 PM_SETRE(pm, CALLREGCOMP(aTHX_ (char*)p, (char*)p + plen, pm));
aaa362c4 3227 if (strEQ("\\s+", PM_GETRE(pm)->precomp))
85e6fe83 3228 pm->op_pmflags |= PMf_WHITE;
eb8433b7
NC		 3229#ifdef PERL_MAD
3230 op_getmad(expr,(OP*)pm,'e');
3231#else
79072805 3232 op_free(expr);
eb8433b7 3233#endif
79072805
LW		 3234 }
3235 else {
3280af22 3236 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL))
1c846c1f 3237 expr = newUNOP((!(PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 3238 ? OP_REGCRESET
3239 : OP_REGCMAYBE),0,expr);
463ee0b2 3240
b7dc083c 3241 NewOp(1101, rcop, 1, LOGOP);
79072805 3242 rcop->op_type = OP_REGCOMP;
22c35a8c 3243 rcop->op_ppaddr = PL_ppaddr[OP_REGCOMP];
79072805 3244 rcop->op_first = scalar(expr);
131b3ad0
DM		 3245 rcop->op_flags |= OPf_KIDS
3246 | ((PL_hints & HINT_RE_EVAL) ? OPf_SPECIAL : 0)
3247 | (reglist ? OPf_STACKED : 0);
79072805 3248 rcop->op_private = 1;
11343788 3249 rcop->op_other = o;
131b3ad0
DM		 3250 if (reglist)
3251 rcop->op_targ = pad_alloc(rcop->op_type, SVs_PADTMP);
3252
b5c19bd7
DM		 3253 /* /$x/ may cause an eval, since $x might be qr/(?{..})/ */
3254 PL_cv_has_eval = 1;
79072805
LW		 3255
3256 /* establish postfix order */
3280af22 3257 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL)) {
463ee0b2
LW		 3258 LINKLIST(expr);
3259 rcop->op_next = expr;
3260 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
3261 }
3262 else {
3263 rcop->op_next = LINKLIST(expr);
3264 expr->op_next = (OP*)rcop;
3265 }
79072805 3266
11343788 3267 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 3268 }
3269
3270 if (repl) {
748a9306 3271 OP *curop;
0244c3a4 3272 if (pm->op_pmflags & PMf_EVAL) {
6136c704 3273 curop = NULL;
8bafa735 3274 if (CopLINE(PL_curcop) < (line_t)PL_multi_end)
eb160463 3275 CopLINE_set(PL_curcop, (line_t)PL_multi_end);
0244c3a4 3276 }
748a9306
LW		 3277 else if (repl->op_type == OP_CONST)
3278 curop = repl;
79072805 3279 else {
c445ea15 3280 OP *lastop = NULL;
79072805 3281 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
22c35a8c 3282 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805 3283 if (curop->op_type == OP_GV) {
6136c704 3284 GV * const gv = cGVOPx_gv(curop);
ce862d02 3285 repl_has_vars = 1;
f702bf4a 3286 if (strchr("&`'123456789+-\016\022", *GvENAME(gv)))
79072805
LW		 3287 break;
3288 }
3289 else if (curop->op_type == OP_RV2CV)
3290 break;
3291 else if (curop->op_type == OP_RV2SV ||
3292 curop->op_type == OP_RV2AV ||
3293 curop->op_type == OP_RV2HV ||
3294 curop->op_type == OP_RV2GV) {
3295 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
3296 break;
3297 }
748a9306
LW		 3298 else if (curop->op_type == OP_PADSV ||
3299 curop->op_type == OP_PADAV ||
3300 curop->op_type == OP_PADHV ||
554b3eca 3301 curop->op_type == OP_PADANY) {
ce862d02 3302 repl_has_vars = 1;
748a9306 3303 }
1167e5da 3304 else if (curop->op_type == OP_PUSHRE)
6f207bd3 3305 NOOP; /* Okay here, dangerous in newASSIGNOP */
79072805
LW		 3306 else
3307 break;
3308 }
3309 lastop = curop;
3310 }
748a9306 3311 }
ce862d02 3312 if (curop == repl
1c846c1f 3313 && !(repl_has_vars
aaa362c4
RS		 3314 && (!PM_GETRE(pm)
3315 || PM_GETRE(pm)->reganch & ROPT_EVAL_SEEN))) {
748a9306 3316 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 3317 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 3318 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 3319 }
3320 else {
aaa362c4 3321 if (curop == repl && !PM_GETRE(pm)) { /* Has variables. */
ce862d02
IZ		 3322 pm->op_pmflags |= PMf_MAYBE_CONST;
3323 pm->op_pmpermflags |= PMf_MAYBE_CONST;
3324 }
b7dc083c 3325 NewOp(1101, rcop, 1, LOGOP);
748a9306 3326 rcop->op_type = OP_SUBSTCONT;
22c35a8c 3327 rcop->op_ppaddr = PL_ppaddr[OP_SUBSTCONT];
748a9306
LW		 3328 rcop->op_first = scalar(repl);
3329 rcop->op_flags |= OPf_KIDS;
3330 rcop->op_private = 1;
11343788 3331 rcop->op_other = o;
748a9306
LW		 3332
3333 /* establish postfix order */
3334 rcop->op_next = LINKLIST(repl);
3335 repl->op_next = (OP*)rcop;
3336
3337 pm->op_pmreplroot = scalar((OP*)rcop);
3338 pm->op_pmreplstart = LINKLIST(rcop);
3339 rcop->op_next = 0;
79072805
LW		 3340 }
3341 }
3342
3343 return (OP*)pm;
3344}
3345
3346OP *
864dbfa3 3347Perl_newSVOP(pTHX_ I32 type, I32 flags, SV *sv)
79072805 3348{
27da23d5 3349 dVAR;
79072805 3350 SVOP *svop;
b7dc083c 3351 NewOp(1101, svop, 1, SVOP);
eb160463 3352 svop->op_type = (OPCODE)type;
22c35a8c 3353 svop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3354 svop->op_sv = sv;
3355 svop->op_next = (OP*)svop;
eb160463 3356 svop->op_flags = (U8)flags;
22c35a8c 3357 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 3358 scalar((OP*)svop);
22c35a8c 3359 if (PL_opargs[type] & OA_TARGET)
ed6116ce 3360 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 3361 return CHECKOP(type, svop);
79072805
LW		 3362}
3363
3364OP *
350de78d
GS		 3365Perl_newPADOP(pTHX_ I32 type, I32 flags, SV *sv)
3366{
27da23d5 3367 dVAR;
350de78d
GS		 3368 PADOP *padop;
3369 NewOp(1101, padop, 1, PADOP);
eb160463 3370 padop->op_type = (OPCODE)type;
350de78d
GS		 3371 padop->op_ppaddr = PL_ppaddr[type];
3372 padop->op_padix = pad_alloc(type, SVs_PADTMP);
dd2155a4
DM		 3373 SvREFCNT_dec(PAD_SVl(padop->op_padix));
3374 PAD_SETSV(padop->op_padix, sv);
ce50c033
AMS		 3375 if (sv)
3376 SvPADTMP_on(sv);
350de78d 3377 padop->op_next = (OP*)padop;
eb160463 3378 padop->op_flags = (U8)flags;
350de78d
GS		 3379 if (PL_opargs[type] & OA_RETSCALAR)
3380 scalar((OP*)padop);
3381 if (PL_opargs[type] & OA_TARGET)
3382 padop->op_targ = pad_alloc(type, SVs_PADTMP);
3383 return CHECKOP(type, padop);
3384}
3385
3386OP *
864dbfa3 3387Perl_newGVOP(pTHX_ I32 type, I32 flags, GV *gv)
79072805 3388{
27da23d5 3389 dVAR;
350de78d 3390#ifdef USE_ITHREADS
ce50c033
AMS		 3391 if (gv)
3392 GvIN_PAD_on(gv);
b37c2d43 3393 return newPADOP(type, flags, SvREFCNT_inc_simple(gv));
350de78d 3394#else
b37c2d43 3395 return newSVOP(type, flags, SvREFCNT_inc_simple(gv));
350de78d 3396#endif
79072805
LW		 3397}
3398
3399OP *
864dbfa3 3400Perl_newPVOP(pTHX_ I32 type, I32 flags, char *pv)
79072805 3401{
27da23d5 3402 dVAR;
79072805 3403 PVOP *pvop;
b7dc083c 3404 NewOp(1101, pvop, 1, PVOP);
eb160463 3405 pvop->op_type = (OPCODE)type;
22c35a8c 3406 pvop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3407 pvop->op_pv = pv;
3408 pvop->op_next = (OP*)pvop;
eb160463 3409 pvop->op_flags = (U8)flags;
22c35a8c 3410 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 3411 scalar((OP*)pvop);
22c35a8c 3412 if (PL_opargs[type] & OA_TARGET)
ed6116ce 3413 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 3414 return CHECKOP(type, pvop);
79072805
LW		 3415}
3416
eb8433b7
NC		 3417#ifdef PERL_MAD
3418OP*
3419#else
79072805 3420void
eb8433b7 3421#endif
864dbfa3 3422Perl_package(pTHX_ OP *o)
79072805 3423{
97aff369 3424 dVAR;
6867be6d 3425 const char *name;
de11ba31 3426 STRLEN len;
eb8433b7
NC		 3427#ifdef PERL_MAD
3428 OP *pegop;
3429#endif
79072805 3430
3280af22
NIS		 3431 save_hptr(&PL_curstash);
3432 save_item(PL_curstname);
de11ba31 3433
5c144d81 3434 name = SvPV_const(cSVOPo->op_sv, len);
de11ba31
AMS		 3435 PL_curstash = gv_stashpvn(name, len, TRUE);
3436 sv_setpvn(PL_curstname, name, len);
de11ba31 3437
7ad382f4 3438 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 3439 PL_copline = NOLINE;
3440 PL_expect = XSTATE;
eb8433b7
NC		 3441
3442#ifndef PERL_MAD
3443 op_free(o);
3444#else
3445 if (!PL_madskills) {
3446 op_free(o);
1d866c12 3447 return NULL;
eb8433b7
NC		 3448 }
3449
3450 pegop = newOP(OP_NULL,0);
3451 op_getmad(o,pegop,'P');
3452 return pegop;
3453#endif
79072805
LW		 3454}
3455
eb8433b7
NC		 3456#ifdef PERL_MAD
3457OP*
3458#else
85e6fe83 3459void
eb8433b7 3460#endif
88d95a4d 3461Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *idop, OP *arg)
85e6fe83 3462{
97aff369 3463 dVAR;
a0d0e21e 3464 OP *pack;
a0d0e21e 3465 OP *imop;
b1cb66bf 3466 OP *veop;
eb8433b7
NC		 3467#ifdef PERL_MAD
3468 OP *pegop = newOP(OP_NULL,0);
3469#endif
85e6fe83 3470
88d95a4d 3471 if (idop->op_type != OP_CONST)
cea2e8a9 3472 Perl_croak(aTHX_ "Module name must be constant");
85e6fe83 3473
eb8433b7
NC		 3474 if (PL_madskills)
3475 op_getmad(idop,pegop,'U');
3476
5f66b61c 3477 veop = NULL;
b1cb66bf 3478
aec46f14 3479 if (version) {
551405c4 3480 SV * const vesv = ((SVOP*)version)->op_sv;
b1cb66bf 3481
eb8433b7
NC		 3482 if (PL_madskills)
3483 op_getmad(version,pegop,'V');
aec46f14 3484 if (!arg && !SvNIOKp(vesv)) {
b1cb66bf 3485 arg = version;
3486 }
3487 else {
3488 OP *pack;
0f79a09d 3489 SV *meth;
b1cb66bf 3490
44dcb63b 3491 if (version->op_type != OP_CONST || !SvNIOKp(vesv))
cea2e8a9 3492 Perl_croak(aTHX_ "Version number must be constant number");
b1cb66bf 3493
88d95a4d
JH		 3494 /* Make copy of idop so we don't free it twice */
3495 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv));
b1cb66bf 3496
3497 /* Fake up a method call to VERSION */
18916d0d 3498 meth = newSVpvs_share("VERSION");
b1cb66bf 3499 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
3500 append_elem(OP_LIST,
0f79a09d
GS		 3501 prepend_elem(OP_LIST, pack, list(version)),
3502 newSVOP(OP_METHOD_NAMED, 0, meth)));
b1cb66bf 3503 }
3504 }
aeea060c 3505
a0d0e21e 3506 /* Fake up an import/unimport */
eb8433b7
NC		 3507 if (arg && arg->op_type == OP_STUB) {
3508 if (PL_madskills)
3509 op_getmad(arg,pegop,'S');
4633a7c4 3510 imop = arg; /* no import on explicit () */
eb8433b7 3511 }
88d95a4d 3512 else if (SvNIOKp(((SVOP*)idop)->op_sv)) {
5f66b61c 3513 imop = NULL; /* use 5.0; */
468aa647
RGS		 3514 if (!aver)
3515 idop->op_private |= OPpCONST_NOVER;
b1cb66bf 3516 }
4633a7c4 3517 else {
0f79a09d
GS		 3518 SV *meth;
3519
eb8433b7
NC		 3520 if (PL_madskills)
3521 op_getmad(arg,pegop,'A');
3522
88d95a4d
JH		 3523 /* Make copy of idop so we don't free it twice */
3524 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv));
0f79a09d
GS		 3525
3526 /* Fake up a method call to import/unimport */
427d62a4 3527 meth = aver
18916d0d 3528 ? newSVpvs_share("import") : newSVpvs_share("unimport");
4633a7c4 3529 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
0f79a09d
GS		 3530 append_elem(OP_LIST,
3531 prepend_elem(OP_LIST, pack, list(arg)),
3532 newSVOP(OP_METHOD_NAMED, 0, meth)));
4633a7c4
LW		 3533 }
3534
a0d0e21e 3535 /* Fake up the BEGIN {}, which does its thing immediately. */
09bef843 3536 newATTRSUB(floor,
18916d0d 3537 newSVOP(OP_CONST, 0, newSVpvs_share("BEGIN")),
5f66b61c
AL		 3538 NULL,
3539 NULL,
a0d0e21e 3540 append_elem(OP_LINESEQ,
b1cb66bf 3541 append_elem(OP_LINESEQ,
bd61b366
SS		 3542 newSTATEOP(0, NULL, newUNOP(OP_REQUIRE, 0, idop)),
3543 newSTATEOP(0, NULL, veop)),
3544 newSTATEOP(0, NULL, imop) ));
85e6fe83 3545
70f5e4ed
JH		 3546 /* The "did you use incorrect case?" warning used to be here.
3547 * The problem is that on case-insensitive filesystems one
3548 * might get false positives for "use" (and "require"):
3549 * "use Strict" or "require CARP" will work. This causes
3550 * portability problems for the script: in case-strict
3551 * filesystems the script will stop working.
3552 *
3553 * The "incorrect case" warning checked whether "use Foo"
3554 * imported "Foo" to your namespace, but that is wrong, too:
3555 * there is no requirement nor promise in the language that
3556 * a Foo.pm should or would contain anything in package "Foo".
3557 *
3558 * There is very little Configure-wise that can be done, either:
3559 * the case-sensitivity of the build filesystem of Perl does not
3560 * help in guessing the case-sensitivity of the runtime environment.
3561 */
18fc9488 3562
c305c6a0 3563 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 3564 PL_copline = NOLINE;
3565 PL_expect = XSTATE;
8ec8fbef 3566 PL_cop_seqmax++; /* Purely for B::*'s benefit */
eb8433b7
NC		 3567
3568#ifdef PERL_MAD
3569 if (!PL_madskills) {
3570 /* FIXME - don't allocate pegop if !PL_madskills */
3571 op_free(pegop);
1d866c12 3572 return NULL;
eb8433b7
NC		 3573 }
3574 return pegop;
3575#endif
85e6fe83
LW		 3576}
3577
7d3fb230 3578/*
ccfc67b7
JH		 3579=head1 Embedding Functions
3580
7d3fb230
BS		 3581=for apidoc load_module
3582
3583Loads the module whose name is pointed to by the string part of name.
3584Note that the actual module name, not its filename, should be given.
3585Eg, "Foo::Bar" instead of "Foo/Bar.pm". flags can be any of
3586PERL_LOADMOD_DENY, PERL_LOADMOD_NOIMPORT, or PERL_LOADMOD_IMPORT_OPS
3587(or 0 for no flags). ver, if specified, provides version semantics
3588similar to C<use Foo::Bar VERSION>. The optional trailing SV*
3589arguments can be used to specify arguments to the module's import()
3590method, similar to C<use Foo::Bar VERSION LIST>.
3591
3592=cut */
3593
e4783991
GS		 3594void
3595Perl_load_module(pTHX_ U32 flags, SV *name, SV *ver, ...)
3596{
3597 va_list args;
3598 va_start(args, ver);
3599 vload_module(flags, name, ver, &args);
3600 va_end(args);
3601}
3602
3603#ifdef PERL_IMPLICIT_CONTEXT
3604void
3605Perl_load_module_nocontext(U32 flags, SV *name, SV *ver, ...)
3606{
3607 dTHX;
3608 va_list args;
3609 va_start(args, ver);
3610 vload_module(flags, name, ver, &args);
3611 va_end(args);
3612}
3613#endif
3614
3615void
3616Perl_vload_module(pTHX_ U32 flags, SV *name, SV *ver, va_list *args)
3617{
97aff369 3618 dVAR;
551405c4 3619 OP *veop, *imop;
e4783991 3620
551405c4 3621 OP * const modname = newSVOP(OP_CONST, 0, name);
e4783991
GS		 3622 modname->op_private |= OPpCONST_BARE;
3623 if (ver) {
3624 veop = newSVOP(OP_CONST, 0, ver);
3625 }
3626 else
5f66b61c 3627 veop = NULL;
e4783991
GS		 3628 if (flags & PERL_LOADMOD_NOIMPORT) {
3629 imop = sawparens(newNULLLIST());
3630 }
3631 else if (flags & PERL_LOADMOD_IMPORT_OPS) {
3632 imop = va_arg(*args, OP*);
3633 }
3634 else {
3635 SV *sv;
5f66b61c 3636 imop = NULL;
e4783991
GS		 3637 sv = va_arg(*args, SV*);
3638 while (sv) {
3639 imop = append_elem(OP_LIST, imop, newSVOP(OP_CONST, 0, sv));
3640 sv = va_arg(*args, SV*);
3641 }
3642 }
81885997 3643 {
6867be6d
AL		 3644 const line_t ocopline = PL_copline;
3645 COP * const ocurcop = PL_curcop;
3646 const int oexpect = PL_expect;
81885997
GS		 3647
3648 utilize(!(flags & PERL_LOADMOD_DENY), start_subparse(FALSE, 0),
3649 veop, modname, imop);
3650 PL_expect = oexpect;
3651 PL_copline = ocopline;
834a3ffa 3652 PL_curcop = ocurcop;
81885997 3653 }
e4783991
GS		 3654}
3655
79072805 3656OP *
850e8516 3657Perl_dofile(pTHX_ OP *term, I32 force_builtin)
78ca652e 3658{
97aff369 3659 dVAR;
78ca652e 3660 OP *doop;
a0714e2c 3661 GV *gv = NULL;
78ca652e 3662
850e8516 3663 if (!force_builtin) {
fafc274c 3664 gv = gv_fetchpvs("do", GV_NOTQUAL, SVt_PVCV);
850e8516 3665 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv))) {
a4fc7abc 3666 GV * const * const gvp = (GV**)hv_fetchs(PL_globalstash, "do", FALSE);
a0714e2c 3667 gv = gvp ? *gvp : NULL;
850e8516
RGS		 3668 }
3669 }
78ca652e 3670
b9f751c0 3671 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
78ca652e
GS		 3672 doop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
3673 append_elem(OP_LIST, term,
3674 scalar(newUNOP(OP_RV2CV, 0,
d4c19fe8 3675 newGVOP(OP_GV, 0, gv))))));
78ca652e
GS		 3676 }
3677 else {
3678 doop = newUNOP(OP_DOFILE, 0, scalar(term));
3679 }
3680 return doop;
3681}
3682
3683OP *
864dbfa3 3684Perl_newSLICEOP(pTHX_ I32 flags, OP *subscript, OP *listval)
79072805
LW		 3685{
3686 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 3687 list(force_list(subscript)),
3688 list(force_list(listval)) );
79072805
LW		 3689}
3690
76e3520e 3691STATIC I32
504618e9 3692S_is_list_assignment(pTHX_ register const OP *o)
79072805 3693{
1496a290
AL		 3694 unsigned type;
3695 U8 flags;
3696
11343788 3697 if (!o)
79072805
LW		 3698 return TRUE;
3699
1496a290 3700 if ((o->op_type == OP_NULL) && (o->op_flags & OPf_KIDS))
11343788 3701 o = cUNOPo->op_first;
79072805 3702
1496a290
AL		 3703 flags = o->op_flags;
3704 type = o->op_type;
3705 if (type == OP_COND_EXPR) {
504618e9
AL		 3706 const I32 t = is_list_assignment(cLOGOPo->op_first->op_sibling);
3707 const I32 f = is_list_assignment(cLOGOPo->op_first->op_sibling->op_sibling);
79072805
LW		 3708
3709 if (t && f)
3710 return TRUE;
3711 if (t || f)
3712 yyerror("Assignment to both a list and a scalar");
3713 return FALSE;
3714 }
3715
1496a290
AL		 3716 if (type == OP_LIST &&
3717 (flags & OPf_WANT) == OPf_WANT_SCALAR &&
95f0a2f1
SB		 3718 o->op_private & OPpLVAL_INTRO)
3719 return FALSE;
3720
1496a290
AL		 3721 if (type == OP_LIST || flags & OPf_PARENS ||
3722 type == OP_RV2AV || type == OP_RV2HV ||
3723 type == OP_ASLICE || type == OP_HSLICE)
79072805
LW		 3724 return TRUE;
3725
1496a290 3726 if (type == OP_PADAV || type == OP_PADHV)
93a17b20
LW		 3727 return TRUE;
3728
1496a290 3729 if (type == OP_RV2SV)
79072805
LW		 3730 return FALSE;
3731
3732 return FALSE;
3733}
3734
3735OP *
864dbfa3 3736Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
79072805 3737{
97aff369 3738 dVAR;
11343788 3739 OP *o;
79072805 3740
a0d0e21e 3741 if (optype) {
c963b151 3742 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN || optype == OP_DORASSIGN) {
a0d0e21e
LW		 3743 return newLOGOP(optype, 0,
3744 mod(scalar(left), optype),
3745 newUNOP(OP_SASSIGN, 0, scalar(right)));
3746 }
3747 else {
3748 return newBINOP(optype, OPf_STACKED,
3749 mod(scalar(left), optype), scalar(right));
3750 }
3751 }
3752
504618e9 3753 if (is_list_assignment(left)) {
10c8fecd
GS		 3754 OP *curop;
3755
3280af22 3756 PL_modcount = 0;
dbfe47cf
RD		 3757 /* Grandfathering $[ assignment here. Bletch.*/
3758 /* Only simple assignments like C<< ($[) = 1 >> are allowed */
3759 PL_eval_start = (left->op_type == OP_CONST) ? right : 0;
463ee0b2 3760 left = mod(left, OP_AASSIGN);
3280af22
NIS		 3761 if (PL_eval_start)
3762 PL_eval_start = 0;
dbfe47cf 3763 else if (left->op_type == OP_CONST) {
eb8433b7 3764 /* FIXME for MAD */
dbfe47cf
RD		 3765 /* Result of assignment is always 1 (or we'd be dead already) */
3766 return newSVOP(OP_CONST, 0, newSViv(1));
a0d0e21e 3767 }
10c8fecd
GS		 3768 curop = list(force_list(left));
3769 o = newBINOP(OP_AASSIGN, flags, list(force_list(right)), curop);
eb160463 3770 o->op_private = (U8)(0 | (flags >> 8));
dd2155a4
DM		 3771
3772 /* PL_generation sorcery:
3773 * an assignment like ($a,$b) = ($c,$d) is easier than
3774 * ($a,$b) = ($c,$a), since there is no need for temporary vars.
3775 * To detect whether there are common vars, the global var
3776 * PL_generation is incremented for each assign op we compile.
3777 * Then, while compiling the assign op, we run through all the
3778 * variables on both sides of the assignment, setting a spare slot
3779 * in each of them to PL_generation. If any of them already have
3780 * that value, we know we've got commonality. We could use a
3781 * single bit marker, but then we'd have to make 2 passes, first
3782 * to clear the flag, then to test and set it. To find somewhere
3783 * to store these values, evil chicanery is done with SvCUR().
3784 */
3785
461824dc 3786 {
11343788 3787 OP *lastop = o;
3280af22 3788 PL_generation++;
11343788 3789 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
22c35a8c 3790 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805 3791 if (curop->op_type == OP_GV) {
638eceb6 3792 GV *gv = cGVOPx_gv(curop);
169d2d72
NC		 3793 if (gv == PL_defgv
3794 || (int)GvASSIGN_GENERATION(gv) == PL_generation)
79072805 3795 break;
169d2d72 3796 GvASSIGN_GENERATION_set(gv, PL_generation);
79072805 3797 }
748a9306
LW		 3798 else if (curop->op_type == OP_PADSV ||
3799 curop->op_type == OP_PADAV ||
3800 curop->op_type == OP_PADHV ||
dd2155a4
DM		 3801 curop->op_type == OP_PADANY)
3802 {
3803 if (PAD_COMPNAME_GEN(curop->op_targ)
92251a1e 3804 == (STRLEN)PL_generation)
748a9306 3805 break;
b162af07 3806 PAD_COMPNAME_GEN_set(curop->op_targ, PL_generation);
dd2155a4 3807
748a9306 3808 }
79072805
LW		 3809 else if (curop->op_type == OP_RV2CV)
3810 break;
3811 else if (curop->op_type == OP_RV2SV ||
3812 curop->op_type == OP_RV2AV ||
3813 curop->op_type == OP_RV2HV ||
3814 curop->op_type == OP_RV2GV) {
3815 if (lastop->op_type != OP_GV) /* funny deref? */
3816 break;
3817 }
1167e5da
SM		 3818 else if (curop->op_type == OP_PUSHRE) {
3819 if (((PMOP*)curop)->op_pmreplroot) {
b3f5893f 3820#ifdef USE_ITHREADS
dd2155a4
DM		 3821 GV *gv = (GV*)PAD_SVl(INT2PTR(PADOFFSET,
3822 ((PMOP*)curop)->op_pmreplroot));
b3f5893f 3823#else
1167e5da 3824 GV *gv = (GV*)((PMOP*)curop)->op_pmreplroot;
b3f5893f 3825#endif
169d2d72
NC		 3826 if (gv == PL_defgv
3827 || (int)GvASSIGN_GENERATION(gv) == PL_generation)
1167e5da 3828 break;
169d2d72
NC		 3829 GvASSIGN_GENERATION_set(gv, PL_generation);
3830 GvASSIGN_GENERATION_set(gv, PL_generation);
b2ffa427 3831 }
1167e5da 3832 }
79072805
LW		 3833 else
3834 break;
3835 }
3836 lastop = curop;
3837 }
11343788 3838 if (curop != o)
10c8fecd 3839 o->op_private |= OPpASSIGN_COMMON;
461824dc 3840 }
9fdc7570
RGS		 3841
3842 if ( ((left->op_private & OPpLVAL_INTRO) || ckWARN(WARN_MISC))
3843 && (left->op_type == OP_LIST
3844 || (left->op_type == OP_NULL && left->op_targ == OP_LIST)))
3845 {
3846 OP* lop = ((LISTOP*)left)->op_first;
3847 while (lop) {
3848 if (lop->op_type == OP_PADSV ||
3849 lop->op_type == OP_PADAV ||
3850 lop->op_type == OP_PADHV ||
3851 lop->op_type == OP_PADANY)
3852 {
3853 if (lop->op_private & OPpPAD_STATE) {
3854 if (left->op_private & OPpLVAL_INTRO) {
3855 o->op_private |= OPpASSIGN_STATE;
3856 /* hijacking PADSTALE for uninitialized state variables */
3857 SvPADSTALE_on(PAD_SVl(lop->op_targ));
3858 }
3859 else { /* we already checked for WARN_MISC before */
3860 Perl_warner(aTHX_ packWARN(WARN_MISC), "State variable %s will be reinitialized",
3861 PAD_COMPNAME_PV(lop->op_targ));
3862 }
3863 }
3864 }
3865 lop = lop->op_sibling;
3866 }
3867 }
3868
c07a80fd 3869 if (right && right->op_type == OP_SPLIT) {
1496a290
AL		 3870 OP* tmpop = ((LISTOP*)right)->op_first;
3871 if (tmpop && (tmpop->op_type == OP_PUSHRE)) {
551405c4 3872 PMOP * const pm = (PMOP*)tmpop;
c07a80fd 3873 if (left->op_type == OP_RV2AV &&
3874 !(left->op_private & OPpLVAL_INTRO) &&
11343788 3875 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 3876 {
3877 tmpop = ((UNOP*)left)->op_first;
3878 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
971a9dd3 3879#ifdef USE_ITHREADS
ba89bb6e 3880 pm->op_pmreplroot = INT2PTR(OP*, cPADOPx(tmpop)->op_padix);
971a9dd3
GS		 3881 cPADOPx(tmpop)->op_padix = 0; /* steal it */
3882#else
3883 pm->op_pmreplroot = (OP*)cSVOPx(tmpop)->op_sv;
a0714e2c 3884 cSVOPx(tmpop)->op_sv = NULL; /* steal it */
971a9dd3 3885#endif
c07a80fd 3886 pm->op_pmflags |= PMf_ONCE;
11343788 3887 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 3888 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
5f66b61c 3889 tmpop->op_sibling = NULL; /* don't free split */
c07a80fd 3890 right->op_next = tmpop->op_next; /* fix starting loc */
eb8433b7
NC		 3891#ifdef PERL_MAD
3892 op_getmad(o,right,'R'); /* blow off assign */
3893#else
11343788 3894 op_free(o); /* blow off assign */
eb8433b7 3895#endif
54310121 3896 right->op_flags &= ~OPf_WANT;
a5f75d66 3897 /* "I don't know and I don't care." */
c07a80fd 3898 return right;
3899 }
3900 }
3901 else {
e6438c1a 3902 if (PL_modcount < RETURN_UNLIMITED_NUMBER &&
c07a80fd 3903 ((LISTOP*)right)->op_last->op_type == OP_CONST)
3904 {
3905 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
3906 if (SvIVX(sv) == 0)
3280af22 3907 sv_setiv(sv, PL_modcount+1);
c07a80fd 3908 }
3909 }
3910 }
3911 }
11343788 3912 return o;
79072805
LW		 3913 }
3914 if (!right)
3915 right = newOP(OP_UNDEF, 0);
3916 if (right->op_type == OP_READLINE) {
3917 right->op_flags |= OPf_STACKED;
463ee0b2 3918 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 3919 }
a0d0e21e 3920 else {
3280af22 3921 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 3922 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 3923 scalar(right), mod(scalar(left), OP_SASSIGN) );
3280af22
NIS		 3924 if (PL_eval_start)
3925 PL_eval_start = 0;
748a9306 3926 else {
eb8433b7 3927 /* FIXME for MAD */
3b6547f5 3928 op_free(o);
fc15ae8f 3929 o = newSVOP(OP_CONST, 0, newSViv(CopARYBASE_get(&PL_compiling)));
2e0ae2d3 3930 o->op_private |= OPpCONST_ARYBASE;
a0d0e21e
LW		 3931 }
3932 }
11343788 3933 return o;
79072805
LW		 3934}
3935
3936OP *
864dbfa3 3937Perl_newSTATEOP(pTHX_ I32 flags, char *label, OP *o)
79072805 3938{
27da23d5 3939 dVAR;
e1ec3a88 3940 const U32 seq = intro_my();
79072805
LW		 3941 register COP *cop;
3942
b7dc083c 3943 NewOp(1101, cop, 1, COP);
57843af0 3944 if (PERLDB_LINE && CopLINE(PL_curcop) && PL_curstash != PL_debstash) {
8990e307 3945 cop->op_type = OP_DBSTATE;
22c35a8c 3946 cop->op_ppaddr = PL_ppaddr[ OP_DBSTATE ];
8990e307
LW		 3947 }
3948 else {
3949 cop->op_type = OP_NEXTSTATE;
22c35a8c 3950 cop->op_ppaddr = PL_ppaddr[ OP_NEXTSTATE ];
8990e307 3951 }
eb160463 3952 cop->op_flags = (U8)flags;
623e6609 3953 CopHINTS_set(cop, PL_hints);
ff0cee69 3954#ifdef NATIVE_HINTS
3955 cop->op_private |= NATIVE_HINTS;
3956#endif
623e6609 3957 CopHINTS_set(&PL_compiling, CopHINTS_get(cop));
79072805
LW		 3958 cop->op_next = (OP*)cop;
3959
463ee0b2
LW		 3960 if (label) {
3961 cop->cop_label = label;
3280af22 3962 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 3963 }
bbce6d69 3964 cop->cop_seq = seq;
7b0bddfa 3965 /* CopARYBASE is now "virtual", in that it's stored as a flag bit in
c28fe1ec
NC		 3966 CopHINTS and a possible value in cop_hints_hash, so no need to copy it.
3967 */
72dc9ed5 3968 cop->cop_warnings = DUP_WARNINGS(PL_curcop->cop_warnings);
c28fe1ec
NC		 3969 cop->cop_hints_hash = PL_curcop->cop_hints_hash;
3970 if (cop->cop_hints_hash) {
cbb1fbea 3971 HINTS_REFCNT_LOCK;
c28fe1ec 3972 cop->cop_hints_hash->refcounted_he_refcnt++;
cbb1fbea 3973 HINTS_REFCNT_UNLOCK;
b3ca2e83 3974 }
79072805 3975
3280af22 3976 if (PL_copline == NOLINE)
57843af0 3977 CopLINE_set(cop, CopLINE(PL_curcop));
79072805 3978 else {
57843af0 3979 CopLINE_set(cop, PL_copline);
3280af22 3980 PL_copline = NOLINE;
79072805 3981 }
57843af0 3982#ifdef USE_ITHREADS
f4dd75d9 3983 CopFILE_set(cop, CopFILE(PL_curcop)); /* XXX share in a pvtable? */
57843af0 3984#else
f4dd75d9 3985 CopFILEGV_set(cop, CopFILEGV(PL_curcop));
57843af0 3986#endif
11faa288 3987 CopSTASH_set(cop, PL_curstash);
79072805 3988
3280af22 3989 if (PERLDB_LINE && PL_curstash != PL_debstash) {
fe8247eb 3990 SV * const * const svp = av_fetch(CopFILEAVx(PL_curcop), (I32)CopLINE(cop), FALSE);
2d03de9c
AL		 3991 if (svp && *svp != &PL_sv_undef ) {
3992 (void)SvIOK_on(*svp);
45977657 3993 SvIV_set(*svp, PTR2IV(cop));
1eb1540c 3994 }
93a17b20
LW		 3995 }
3996
722969e2 3997 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 3998}
3999
bbce6d69 4000
79072805 4001OP *
864dbfa3 4002Perl_newLOGOP(pTHX_ I32 type, I32 flags, OP *first, OP *other)
79072805 4003{
27da23d5 4004 dVAR;
883ffac3
CS		 4005 return new_logop(type, flags, &first, &other);
4006}
4007
3bd495df 4008STATIC OP *
cea2e8a9 4009S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
883ffac3 4010{
27da23d5 4011 dVAR;
79072805 4012 LOGOP *logop;
11343788 4013 OP *o;
883ffac3 4014 OP *first = *firstp;
b22e6366 4015 OP * const other = *otherp;
79072805 4016
a0d0e21e
LW		 4017 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
4018 return newBINOP(type, flags, scalar(first), scalar(other));
4019
8990e307 4020 scalarboolean(first);
79072805 4021 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
68726e16
NC		 4022 if (first->op_type == OP_NOT
4023 && (first->op_flags & OPf_SPECIAL)
4024 && (first->op_flags & OPf_KIDS)) {
79072805
LW		 4025 if (type == OP_AND || type == OP_OR) {
4026 if (type == OP_AND)
4027 type = OP_OR;
4028 else
4029 type = OP_AND;
11343788 4030 o = first;
883ffac3 4031 first = *firstp = cUNOPo->op_first;
11343788
MB		 4032 if (o->op_next)
4033 first->op_next = o->op_next;
5f66b61c 4034 cUNOPo->op_first = NULL;
eb8433b7
NC		 4035#ifdef PERL_MAD
4036 op_getmad(o,first,'O');
4037#else
11343788 4038 op_free(o);
eb8433b7 4039#endif
79072805
LW		 4040 }
4041 }
4042 if (first->op_type == OP_CONST) {
39a440a3
DM		 4043 if (first->op_private & OPpCONST_STRICT)
4044 no_bareword_allowed(first);
041457d9 4045 else if ((first->op_private & OPpCONST_BARE) && ckWARN(WARN_BAREWORD))
989dfb19 4046 Perl_warner(aTHX_ packWARN(WARN_BAREWORD), "Bareword found in conditional");
75cc09e4
MHM		 4047 if ((type == OP_AND && SvTRUE(((SVOP*)first)->op_sv)) ||
4048 (type == OP_OR && !SvTRUE(((SVOP*)first)->op_sv)) ||
4049 (type == OP_DOR && !SvOK(((SVOP*)first)->op_sv))) {
5f66b61c 4050 *firstp = NULL;
d6fee5c7
DM		 4051 if (other->op_type == OP_CONST)
4052 other->op_private |= OPpCONST_SHORTCIRCUIT;
eb8433b7
NC		 4053 if (PL_madskills) {
4054 OP *newop = newUNOP(OP_NULL, 0, other);
4055 op_getmad(first, newop, '1');
4056 newop->op_targ = type; /* set "was" field */
4057 return newop;
4058 }
4059 op_free(first);
79072805
LW		 4060 return other;
4061 }
4062 else {
7921d0f2 4063 /* check for C<my $x if 0>, or C<my($x,$y) if 0> */
6867be6d 4064 const OP *o2 = other;
7921d0f2
DM		 4065 if ( ! (o2->op_type == OP_LIST
4066 && (( o2 = cUNOPx(o2)->op_first))
4067 && o2->op_type == OP_PUSHMARK
4068 && (( o2 = o2->op_sibling)) )
4069 )
4070 o2 = other;
4071 if ((o2->op_type == OP_PADSV || o2->op_type == OP_PADAV
4072 || o2->op_type == OP_PADHV)
4073 && o2->op_private & OPpLVAL_INTRO
4074 && ckWARN(WARN_DEPRECATED))
4075 {
4076 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
4077 "Deprecated use of my() in false conditional");
4078 }
4079
5f66b61c 4080 *otherp = NULL;
d6fee5c7
DM		 4081 if (first->op_type == OP_CONST)
4082 first->op_private |= OPpCONST_SHORTCIRCUIT;
eb8433b7
NC		 4083 if (PL_madskills) {
4084 first = newUNOP(OP_NULL, 0, first);
4085 op_getmad(other, first, '2');
4086 first->op_targ = type; /* set "was" field */
4087 }
4088 else
4089 op_free(other);
79072805
LW		 4090 return first;
4091 }
4092 }
041457d9
DM		 4093 else if ((first->op_flags & OPf_KIDS) && type != OP_DOR
4094 && ckWARN(WARN_MISC)) /* [#24076] Don't warn for <FH> err FOO. */
59e10468 4095 {
b22e6366
AL		 4096 const OP * const k1 = ((UNOP*)first)->op_first;
4097 const OP * const k2 = k1->op_sibling;
a6006777 4098 OPCODE warnop = 0;
4099 switch (first->op_type)
4100 {
4101 case OP_NULL:
4102 if (k2 && k2->op_type == OP_READLINE
4103 && (k2->op_flags & OPf_STACKED)
1c846c1f 4104 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
72b16652 4105 {
a6006777 4106 warnop = k2->op_type;
72b16652 4107 }
a6006777 4108 break;
4109
4110 case OP_SASSIGN:
68dc0745 4111 if (k1->op_type == OP_READDIR
4112 || k1->op_type == OP_GLOB
72b16652 4113 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
68dc0745 4114 || k1->op_type == OP_EACH)
72b16652
GS		 4115 {
4116 warnop = ((k1->op_type == OP_NULL)
eb160463 4117 ? (OPCODE)k1->op_targ : k1->op_type);
72b16652 4118 }
a6006777 4119 break;
4120 }
8ebc5c01 4121 if (warnop) {
6867be6d 4122 const line_t oldline = CopLINE(PL_curcop);
57843af0 4123 CopLINE_set(PL_curcop, PL_copline);
9014280d 4124 Perl_warner(aTHX_ packWARN(WARN_MISC),
599cee73 4125 "Value of %s%s can be \"0\"; test with defined()",
22c35a8c 4126 PL_op_desc[warnop],
68dc0745 4127 ((warnop == OP_READLINE || warnop == OP_GLOB)
4128 ? " construct" : "() operator"));
57843af0 4129 CopLINE_set(PL_curcop, oldline);
8ebc5c01 4130 }
a6006777 4131 }
79072805
LW		 4132
4133 if (!other)
4134 return first;
4135
c963b151 4136 if (type == OP_ANDASSIGN || type == OP_ORASSIGN || type == OP_DORASSIGN)
a0d0e21e
LW		 4137 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
4138
b7dc083c 4139 NewOp(1101, logop, 1, LOGOP);
79072805 4140
eb160463 4141 logop->op_type = (OPCODE)type;
22c35a8c 4142 logop->op_ppaddr = PL_ppaddr[type];
79072805 4143 logop->op_first = first;
585ec06d 4144 logop->op_flags = (U8)(flags | OPf_KIDS);
79072805 4145 logop->op_other = LINKLIST(other);
eb160463 4146 logop->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 4147
4148 /* establish postfix order */
4149 logop->op_next = LINKLIST(first);
4150 first->op_next = (OP*)logop;
4151 first->op_sibling = other;
4152
463d09e6
RGS		 4153 CHECKOP(type,logop);
4154
11343788
MB		 4155 o = newUNOP(OP_NULL, 0, (OP*)logop);
4156 other->op_next = o;
79072805 4157
11343788 4158 return o;
79072805
LW		 4159}
4160
4161OP *
864dbfa3 4162Perl_newCONDOP(pTHX_ I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 4163{
27da23d5 4164 dVAR;
1a67a97c
SM		 4165 LOGOP *logop;
4166 OP *start;
11343788 4167 OP *o;
79072805 4168
b1cb66bf 4169 if (!falseop)
4170 return newLOGOP(OP_AND, 0, first, trueop);
4171 if (!trueop)
4172 return newLOGOP(OP_OR, 0, first, falseop);
79072805 4173
8990e307 4174 scalarboolean(first);
79072805 4175 if (first->op_type == OP_CONST) {
2bc6235c 4176 if (first->op_private & OPpCONST_BARE &&
b22e6366
AL		 4177 first->op_private & OPpCONST_STRICT) {
4178 no_bareword_allowed(first);
4179 }
79072805 4180 if (SvTRUE(((SVOP*)first)->op_sv)) {
eb8433b7
NC		 4181#ifdef PERL_MAD
4182 if (PL_madskills) {
4183 trueop = newUNOP(OP_NULL, 0, trueop);
4184 op_getmad(first,trueop,'C');
4185 op_getmad(falseop,trueop,'e');
4186 }
4187 /* FIXME for MAD - should there be an ELSE here? */
4188#else
79072805 4189 op_free(first);
b1cb66bf 4190 op_free(falseop);
eb8433b7 4191#endif
b1cb66bf 4192 return trueop;
79072805
LW		 4193 }
4194 else {
eb8433b7
NC		 4195#ifdef PERL_MAD
4196 if (PL_madskills) {
4197 falseop = newUNOP(OP_NULL, 0, falseop);
4198 op_getmad(first,falseop,'C');
4199 op_getmad(trueop,falseop,'t');
4200 }
4201 /* FIXME for MAD - should there be an ELSE here? */
4202#else
79072805 4203 op_free(first);
b1cb66bf 4204 op_free(trueop);
eb8433b7 4205#endif
b1cb66bf 4206 return falseop;
79072805
LW		 4207 }
4208 }
1a67a97c
SM		 4209 NewOp(1101, logop, 1, LOGOP);
4210 logop->op_type = OP_COND_EXPR;
4211 logop->op_ppaddr = PL_ppaddr[OP_COND_EXPR];
4212 logop->op_first = first;
585ec06d 4213 logop->op_flags = (U8)(flags | OPf_KIDS);
eb160463 4214 logop->op_private = (U8)(1 | (flags >> 8));
1a67a97c
SM		 4215 logop->op_other = LINKLIST(trueop);
4216 logop->op_next = LINKLIST(falseop);
79072805 4217
463d09e6
RGS		 4218 CHECKOP(OP_COND_EXPR, /* that's logop->op_type */
4219 logop);
79072805
LW		 4220
4221 /* establish postfix order */
1a67a97c
SM		 4222 start = LINKLIST(first);
4223 first->op_next = (OP*)logop;
79072805 4224
b1cb66bf 4225 first->op_sibling = trueop;
4226 trueop->op_sibling = falseop;
1a67a97c 4227 o = newUNOP(OP_NULL, 0, (OP*)logop);
79072805 4228
1a67a97c 4229 trueop->op_next = falseop->op_next = o;
79072805 4230
1a67a97c 4231 o->op_next = start;
11343788 4232 return o;
79072805
LW		 4233}
4234
4235OP *
864dbfa3 4236Perl_newRANGE(pTHX_ I32 flags, OP *left, OP *right)
79072805 4237{
27da23d5 4238 dVAR;
1a67a97c 4239 LOGOP *range;
79072805
LW		 4240 OP *flip;
4241 OP *flop;
1a67a97c 4242 OP *leftstart;
11343788 4243 OP *o;
79072805 4244
1a67a97c 4245 NewOp(1101, range, 1, LOGOP);
79072805 4246
1a67a97c
SM		 4247 range->op_type = OP_RANGE;
4248 range->op_ppaddr = PL_ppaddr[OP_RANGE];
4249 range->op_first = left;
4250 range->op_flags = OPf_KIDS;
4251 leftstart = LINKLIST(left);
4252 range->op_other = LINKLIST(right);
eb160463 4253 range->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 4254
4255 left->op_sibling = right;
4256
1a67a97c
SM		 4257 range->op_next = (OP*)range;
4258 flip = newUNOP(OP_FLIP, flags, (OP*)range);
79072805 4259 flop = newUNOP(OP_FLOP, 0, flip);
11343788 4260 o = newUNOP(OP_NULL, 0, flop);
79072805 4261 linklist(flop);
1a67a97c 4262 range->op_next = leftstart;
79072805
LW		 4263
4264 left->op_next = flip;
4265 right->op_next = flop;
4266
1a67a97c
SM		 4267 range->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
4268 sv_upgrade(PAD_SV(range->op_targ), SVt_PVNV);
ed6116ce 4269 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 4270 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
4271
4272 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
4273 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
4274
11343788 4275 flip->op_next = o;
79072805 4276 if (!flip->op_private || !flop->op_private)
11343788 4277 linklist(o); /* blow off optimizer unless constant */
79072805 4278
11343788 4279 return o;
79072805
LW		 4280}
4281
4282OP *
864dbfa3 4283Perl_newLOOPOP(pTHX_ I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 4284{
97aff369 4285 dVAR;
463ee0b2 4286 OP* listop;
11343788 4287 OP* o;
73d840c0 4288 const bool once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 4289 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
46c461b5
AL		 4290
4291 PERL_UNUSED_ARG(debuggable);
93a17b20 4292
463ee0b2
LW		 4293 if (expr) {
4294 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
4295 return block; /* do {} while 0 does once */
fb73857a 4296 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
4297 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 4298 expr = newUNOP(OP_DEFINED, 0,
54b9620d 4299 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4 4300 } else if (expr->op_flags & OPf_KIDS) {
46c461b5
AL		 4301 const OP * const k1 = ((UNOP*)expr)->op_first;
4302 const OP * const k2 = k1 ? k1->op_sibling : NULL;
55d729e4 4303 switch (expr->op_type) {
1c846c1f 4304 case OP_NULL:
55d729e4
GS		 4305 if (k2 && k2->op_type == OP_READLINE
4306 && (k2->op_flags & OPf_STACKED)
1c846c1f 4307 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
55d729e4 4308 expr = newUNOP(OP_DEFINED, 0, expr);
1c846c1f 4309 break;
55d729e4
GS		 4310
4311 case OP_SASSIGN:
06dc7ac6 4312 if (k1 && (k1->op_type == OP_READDIR
55d729e4 4313 || k1->op_type == OP_GLOB
6531c3e6 4314 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
06dc7ac6 4315 || k1->op_type == OP_EACH))
55d729e4
GS		 4316 expr = newUNOP(OP_DEFINED, 0, expr);
4317 break;
4318 }
774d564b 4319 }
463ee0b2 4320 }
93a17b20 4321
e1548254
RGS		 4322 /* if block is null, the next append_elem() would put UNSTACK, a scalar
4323 * op, in listop. This is wrong. [perl #27024] */
4324 if (!block)
4325 block = newOP(OP_NULL, 0);
8990e307 4326 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
883ffac3 4327 o = new_logop(OP_AND, 0, &expr, &listop);
463ee0b2 4328
883ffac3
CS		 4329 if (listop)
4330 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 4331
11343788
MB		 4332 if (once && o != listop)
4333 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 4334
11343788
MB		 4335 if (o == listop)
4336 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 4337
11343788
MB		 4338 o->op_flags |= flags;
4339 o = scope(o);
4340 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
4341 return o;
79072805
LW		 4342}
4343
4344OP *
a034e688
DM		 4345Perl_newWHILEOP(pTHX_ I32 flags, I32 debuggable, LOOP *loop, I32
4346whileline, OP *expr, OP *block, OP *cont, I32 has_my)
79072805 4347{
27da23d5 4348 dVAR;
79072805 4349 OP *redo;
c445ea15 4350 OP *next = NULL;
79072805 4351 OP *listop;
11343788 4352 OP *o;
1ba6ee2b 4353 U8 loopflags = 0;
46c461b5
AL		 4354
4355 PERL_UNUSED_ARG(debuggable);
79072805 4356
2d03de9c
AL		 4357 if (expr) {
4358 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
4359 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
4360 expr = newUNOP(OP_DEFINED, 0,
4361 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
4362 } else if (expr->op_flags & OPf_KIDS) {
4363 const OP * const k1 = ((UNOP*)expr)->op_first;
4364 const OP * const k2 = (k1) ? k1->op_sibling : NULL;
4365 switch (expr->op_type) {
4366 case OP_NULL:
4367 if (k2 && k2->op_type == OP_READLINE
4368 && (k2->op_flags & OPf_STACKED)
4369 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
4370 expr = newUNOP(OP_DEFINED, 0, expr);
4371 break;
55d729e4 4372
2d03de9c 4373 case OP_SASSIGN:
72c8de1a 4374 if (k1 && (k1->op_type == OP_READDIR
2d03de9c
AL		 4375 || k1->op_type == OP_GLOB
4376 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
72c8de1a 4377 || k1->op_type == OP_EACH))
2d03de9c
AL		 4378 expr = newUNOP(OP_DEFINED, 0, expr);
4379 break;
4380 }
55d729e4 4381 }
748a9306 4382 }
79072805
LW		 4383
4384 if (!block)
4385 block = newOP(OP_NULL, 0);
a034e688 4386 else if (cont || has_my) {
87246558
GS		 4387 block = scope(block);
4388 }
79072805 4389
1ba6ee2b 4390 if (cont) {
79072805 4391 next = LINKLIST(cont);
1ba6ee2b 4392 }
fb73857a 4393 if (expr) {
551405c4 4394 OP * const unstack = newOP(OP_UNSTACK, 0);
85538317
GS		 4395 if (!next)
4396 next = unstack;
4397 cont = append_elem(OP_LINESEQ, cont, unstack);
fb73857a 4398 }
79072805 4399
ce3e5c45 4400 assert(block);
463ee0b2 4401 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
ce3e5c45 4402 assert(listop);
79072805
LW		 4403 redo = LINKLIST(listop);
4404
4405 if (expr) {
eb160463 4406 PL_copline = (line_t)whileline;
883ffac3
CS		 4407 scalar(listop);
4408 o = new_logop(OP_AND, 0, &expr, &listop);
11343788 4409 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 4410 op_free(expr); /* oops, it's a while (0) */
463ee0b2 4411 op_free((OP*)loop);
5f66b61c 4412 return NULL; /* listop already freed by new_logop */
463ee0b2 4413 }
883ffac3 4414 if (listop)
497b47a8 4415 ((LISTOP*)listop)->op_last->op_next =
883ffac3 4416 (o == listop ? redo : LINKLIST(o));
79072805
LW		 4417 }
4418 else
11343788 4419 o = listop;
79072805
LW		 4420
4421 if (!loop) {
b7dc083c 4422 NewOp(1101,loop,1,LOOP);
79072805 4423 loop->op_type = OP_ENTERLOOP;
22c35a8c 4424 loop->op_ppaddr = PL_ppaddr[OP_ENTERLOOP];
79072805
LW		 4425 loop->op_private = 0;
4426 loop->op_next = (OP*)loop;
4427 }
4428
11343788 4429 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 4430
4431 loop->op_redoop = redo;
11343788 4432 loop->op_lastop = o;
1ba6ee2b 4433 o->op_private |= loopflags;
79072805
LW		 4434
4435 if (next)
4436 loop->op_nextop = next;
4437 else
11343788 4438 loop->op_nextop = o;
79072805 4439
11343788
MB		 4440 o->op_flags |= flags;
4441 o->op_private |= (flags >> 8);
4442 return o;
79072805
LW		 4443}
4444
4445OP *
66a1b24b 4446Perl_newFOROP(pTHX_ I32 flags, char *label, line_t forline, OP *sv, OP *expr, OP *block, OP *cont)
79072805 4447{
27da23d5 4448 dVAR;
79072805 4449 LOOP *loop;
fb73857a 4450 OP *wop;
4bbc6d12 4451 PADOFFSET padoff = 0;
4633a7c4 4452 I32 iterflags = 0;
241416b8 4453 I32 iterpflags = 0;
d4c19fe8 4454 OP *madsv = NULL;
79072805 4455
79072805 4456 if (sv) {
85e6fe83 4457 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
241416b8 4458 iterpflags = sv->op_private & OPpOUR_INTRO; /* for our $x () */
748a9306 4459 sv->op_type = OP_RV2GV;
22c35a8c 4460 sv->op_ppaddr = PL_ppaddr[OP_RV2GV];
0d863452
RH		 4461 if (cGVOPx_gv(cUNOPx(sv)->op_first) == PL_defgv)
4462 iterpflags |= OPpITER_DEF;
79072805 4463 }
85e6fe83 4464 else if (sv->op_type == OP_PADSV) { /* private variable */
241416b8 4465 iterpflags = sv->op_private & OPpLVAL_INTRO; /* for my $x () */
85e6fe83 4466 padoff = sv->op_targ;
eb8433b7
NC		 4467 if (PL_madskills)
4468 madsv = sv;
4469 else {
4470 sv->op_targ = 0;
4471 op_free(sv);
4472 }
5f66b61c 4473 sv = NULL;
85e6fe83 4474 }
54b9620d
MB		 4475 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
4476 padoff = sv->op_targ;
eb8433b7
NC		 4477 if (PL_madskills)
4478 madsv = sv;
4479 else {
4480 sv->op_targ = 0;
4481 iterflags |= OPf_SPECIAL;
4482 op_free(sv);
4483 }
5f66b61c 4484 sv = NULL;
54b9620d 4485 }
79072805 4486 else
cea2e8a9 4487 Perl_croak(aTHX_ "Can't use %s for loop variable", PL_op_desc[sv->op_type]);
0d863452
RH		 4488 if (padoff && strEQ(PAD_COMPNAME_PV(padoff), "$_"))
4489 iterpflags |= OPpITER_DEF;
79072805
LW		 4490 }
4491 else {
9f7d9405 4492 const PADOFFSET offset = pad_findmy("$_");
00b1698f 4493 if (offset == NOT_IN_PAD || PAD_COMPNAME_FLAGS_isOUR(offset)) {
aabe9514
RGS		 4494 sv = newGVOP(OP_GV, 0, PL_defgv);
4495 }
4496 else {
4497 padoff = offset;
aabe9514 4498 }
0d863452 4499 iterpflags |= OPpITER_DEF;
79072805 4500 }
5f05dabc 4501 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
89ea2908 4502 expr = mod(force_list(scalar(ref(expr, OP_ITER))), OP_GREPSTART);
4633a7c4
LW		 4503 iterflags |= OPf_STACKED;
4504 }
89ea2908
GA		 4505 else if (expr->op_type == OP_NULL &&
4506 (expr->op_flags & OPf_KIDS) &&
4507 ((BINOP*)expr)->op_first->op_type == OP_FLOP)
4508 {
4509 /* Basically turn for($x..$y) into the same as for($x,$y), but we
4510 * set the STACKED flag to indicate that these values are to be
4511 * treated as min/max values by 'pp_iterinit'.
4512 */
d4c19fe8 4513 const UNOP* const flip = (UNOP*)((UNOP*)((BINOP*)expr)->op_first)->op_first;
551405c4 4514 LOGOP* const range = (LOGOP*) flip->op_first;
66a1b24b
AL		 4515 OP* const left = range->op_first;
4516 OP* const right = left->op_sibling;
5152d7c7 4517 LISTOP* listop;
89ea2908
GA		 4518
4519 range->op_flags &= ~OPf_KIDS;
5f66b61c 4520 range->op_first = NULL;
89ea2908 4521
5152d7c7 4522 listop = (LISTOP*)newLISTOP(OP_LIST, 0, left, right);
1a67a97c
SM		 4523 listop->op_first->op_next = range->op_next;
4524 left->op_next = range->op_other;
5152d7c7
GS		 4525 right->op_next = (OP*)listop;
4526 listop->op_next = listop->op_first;
89ea2908 4527
eb8433b7
NC		 4528#ifdef PERL_MAD
4529 op_getmad(expr,(OP*)listop,'O');
4530#else
89ea2908 4531 op_free(expr);
eb8433b7 4532#endif
5152d7c7 4533 expr = (OP*)(listop);
93c66552 4534 op_null(expr);
89ea2908
GA		 4535 iterflags |= OPf_STACKED;
4536 }
4537 else {
4538 expr = mod(force_list(expr), OP_GREPSTART);
4539 }
4540
4633a7c4 4541 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
89ea2908 4542 append_elem(OP_LIST, expr, scalar(sv))));
85e6fe83 4543 assert(!loop->op_next);
241416b8 4544 /* for my $x () sets OPpLVAL_INTRO;
14f338dc 4545 * for our $x () sets OPpOUR_INTRO */
c5661c80 4546 loop->op_private = (U8)iterpflags;
b7dc083c 4547#ifdef PL_OP_SLAB_ALLOC
155aba94
GS		 4548 {
4549 LOOP *tmp;
4550 NewOp(1234,tmp,1,LOOP);
bd5f3bc4 4551 Copy(loop,tmp,1,LISTOP);
238a4c30 4552 FreeOp(loop);
155aba94
GS		 4553 loop = tmp;
4554 }
b7dc083c 4555#else
04e62e51 4556 loop = PerlMemShared_realloc(loop, sizeof(LOOP));
1c846c1f 4557#endif
85e6fe83 4558 loop->op_targ = padoff;
a034e688 4559 wop = newWHILEOP(flags, 1, loop, forline, newOP(OP_ITER, 0), block, cont, 0);
eb8433b7
NC		 4560 if (madsv)
4561 op_getmad(madsv, (OP*)loop, 'v');
3280af22 4562 PL_copline = forline;
fb73857a 4563 return newSTATEOP(0, label, wop);
79072805
LW		 4564}
4565
8990e307 4566OP*
864dbfa3 4567Perl_newLOOPEX(pTHX_ I32 type, OP *label)
8990e307 4568{
97aff369 4569 dVAR;
11343788 4570 OP *o;
2d8e6c8d 4571
8990e307 4572 if (type != OP_GOTO || label->op_type == OP_CONST) {
cdaebead
MB		 4573 /* "last()" means "last" */
4574 if (label->op_type == OP_STUB && (label->op_flags & OPf_PARENS))
4575 o = newOP(type, OPf_SPECIAL);
4576 else {
4577 o = newPVOP(type, 0, savepv(label->op_type == OP_CONST
8b6b16e7 4578 ? SvPVx_nolen_const(((SVOP*)label)->op_sv)
cdaebead
MB		 4579 : ""));
4580 }
eb8433b7
NC		 4581#ifdef PERL_MAD
4582 op_getmad(label,o,'L');
4583#else
8990e307 4584 op_free(label);
eb8433b7 4585#endif
8990e307
LW		 4586 }
4587 else {
e3aba57a
RGS		 4588 /* Check whether it's going to be a goto &function */
4589 if (label->op_type == OP_ENTERSUB
4590 && !(label->op_flags & OPf_STACKED))
a0d0e21e 4591 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
11343788 4592 o = newUNOP(type, OPf_STACKED, label);
8990e307 4593 }
3280af22 4594 PL_hints |= HINT_BLOCK_SCOPE;
11343788 4595 return o;
8990e307
LW		 4596}
4597
0d863452
RH		 4598/* if the condition is a literal array or hash
4599 (or @{ ... } etc), make a reference to it.
4600 */
4601STATIC OP *
4602S_ref_array_or_hash(pTHX_ OP *cond)
4603{
4604 if (cond
4605 && (cond->op_type == OP_RV2AV
4606 || cond->op_type == OP_PADAV
4607 || cond->op_type == OP_RV2HV
4608 || cond->op_type == OP_PADHV))
4609
4610 return newUNOP(OP_REFGEN,
4611 0, mod(cond, OP_REFGEN));
4612
4613 else
4614 return cond;
4615}
4616
4617/* These construct the optree fragments representing given()
4618 and when() blocks.
4619
4620 entergiven and enterwhen are LOGOPs; the op_other pointer
4621 points up to the associated leave op. We need this so we
4622 can put it in the context and make break/continue work.
4623 (Also, of course, pp_enterwhen will jump straight to
4624 op_other if the match fails.)
4625 */
4626
4627STATIC
4628OP *
4629S_newGIVWHENOP(pTHX_ OP *cond, OP *block,
4630 I32 enter_opcode, I32 leave_opcode,
4631 PADOFFSET entertarg)
4632{
97aff369 4633 dVAR;
0d863452
RH		 4634 LOGOP *enterop;
4635 OP *o;
4636
4637 NewOp(1101, enterop, 1, LOGOP);
4638 enterop->op_type = enter_opcode;
4639 enterop->op_ppaddr = PL_ppaddr[enter_opcode];
4640 enterop->op_flags = (U8) OPf_KIDS;
4641 enterop->op_targ = ((entertarg == NOT_IN_PAD) ? 0 : entertarg);
4642 enterop->op_private = 0;
4643
4644 o = newUNOP(leave_opcode, 0, (OP *) enterop);
4645
4646 if (cond) {
4647 enterop->op_first = scalar(cond);
4648 cond->op_sibling = block;
4649
4650 o->op_next = LINKLIST(cond);
4651 cond->op_next = (OP *) enterop;
4652 }
4653 else {
4654 /* This is a default {} block */
4655 enterop->op_first = block;
4656 enterop->op_flags |= OPf_SPECIAL;
4657
4658 o->op_next = (OP *) enterop;
4659 }
4660
4661 CHECKOP(enter_opcode, enterop); /* Currently does nothing, since
4662 entergiven and enterwhen both
4663 use ck_null() */
4664
4665 enterop->op_next = LINKLIST(block);
4666 block->op_next = enterop->op_other = o;
4667
4668 return o;
4669}
4670
4671/* Does this look like a boolean operation? For these purposes
4672 a boolean operation is:
4673 - a subroutine call [*]
4674 - a logical connective
4675 - a comparison operator
4676 - a filetest operator, with the exception of -s -M -A -C
4677 - defined(), exists() or eof()
4678 - /$re/ or $foo =~ /$re/
4679
4680 [*] possibly surprising
4681 */
4682STATIC
4683bool
ef519e13 4684S_looks_like_bool(pTHX_ const OP *o)
0d863452 4685{
97aff369 4686 dVAR;
0d863452
RH		 4687 switch(o->op_type) {
4688 case OP_OR:
4689 return looks_like_bool(cLOGOPo->op_first);
4690
4691 case OP_AND:
4692 return (
4693 looks_like_bool(cLOGOPo->op_first)
4694 && looks_like_bool(cLOGOPo->op_first->op_sibling));
4695
4696 case OP_ENTERSUB:
4697
4698 case OP_NOT: case OP_XOR:
4699 /* Note that OP_DOR is not here */
4700
4701 case OP_EQ: case OP_NE: case OP_LT:
4702 case OP_GT: case OP_LE: case OP_GE:
4703
4704 case OP_I_EQ: case OP_I_NE: case OP_I_LT:
4705 case OP_I_GT: case OP_I_LE: case OP_I_GE:
4706
4707 case OP_SEQ: case OP_SNE: case OP_SLT:
4708 case OP_SGT: case OP_SLE: case OP_SGE:
4709
4710 case OP_SMARTMATCH:
4711
4712 case OP_FTRREAD: case OP_FTRWRITE: case OP_FTREXEC:
4713 case OP_FTEREAD: case OP_FTEWRITE: case OP_FTEEXEC:
4714 case OP_FTIS: case OP_FTEOWNED: case OP_FTROWNED:
4715 case OP_FTZERO: case OP_FTSOCK: case OP_FTCHR:
4716 case OP_FTBLK: case OP_FTFILE: case OP_FTDIR:
4717 case OP_FTPIPE: case OP_FTLINK: case OP_FTSUID:
4718 case OP_FTSGID: case OP_FTSVTX: case OP_FTTTY:
4719 case OP_FTTEXT: case OP_FTBINARY:
4720
4721 case OP_DEFINED: case OP_EXISTS:
4722 case OP_MATCH: case OP_EOF:
4723
4724 return TRUE;
4725
4726 case OP_CONST:
4727 /* Detect comparisons that have been optimized away */
4728 if (cSVOPo->op_sv == &PL_sv_yes
4729 || cSVOPo->op_sv == &PL_sv_no)
4730
4731 return TRUE;
4732
4733 /* FALL THROUGH */
4734 default:
4735 return FALSE;
4736 }
4737}
4738
4739OP *
4740Perl_newGIVENOP(pTHX_ OP *cond, OP *block, PADOFFSET defsv_off)
4741{
97aff369 4742 dVAR;
0d863452
RH		 4743 assert( cond );
4744 return newGIVWHENOP(
4745 ref_array_or_hash(cond),
4746 block,
4747 OP_ENTERGIVEN, OP_LEAVEGIVEN,
4748 defsv_off);
4749}
4750
4751/* If cond is null, this is a default {} block */
4752OP *
4753Perl_newWHENOP(pTHX_ OP *cond, OP *block)
4754{
ef519e13 4755 const bool cond_llb = (!cond || looks_like_bool(cond));
0d863452
RH		 4756 OP *cond_op;
4757
4758 if (cond_llb)
4759 cond_op = cond;
4760 else {
4761 cond_op = newBINOP(OP_SMARTMATCH, OPf_SPECIAL,
4762 newDEFSVOP(),
4763 scalar(ref_array_or_hash(cond)));
4764 }
4765
4766 return newGIVWHENOP(
4767 cond_op,
4768 append_elem(block->op_type, block, newOP(OP_BREAK, OPf_SPECIAL)),
4769 OP_ENTERWHEN, OP_LEAVEWHEN, 0);
4770}
4771
7dafbf52
DM		 4772/*
4773=for apidoc cv_undef
4774
4775Clear out all the active components of a CV. This can happen either
4776by an explicit C<undef &foo>, or by the reference count going to zero.
4777In the former case, we keep the CvOUTSIDE pointer, so that any anonymous
4778children can still follow the full lexical scope chain.
4779
4780=cut
4781*/
4782
79072805 4783void
864dbfa3 4784Perl_cv_undef(pTHX_ CV *cv)
79072805 4785{
27da23d5 4786 dVAR;
a636914a 4787#ifdef USE_ITHREADS
aed2304a 4788 if (CvFILE(cv) && !CvISXSUB(cv)) {
35f1c1c7 4789 /* for XSUBs CvFILE point directly to static memory; __FILE__ */
a636914a 4790 Safefree(CvFILE(cv));
a636914a 4791 }
f3e31eb5 4792 CvFILE(cv) = 0;
a636914a
RH		 4793#endif
4794
aed2304a 4795 if (!CvISXSUB(cv) && CvROOT(cv)) {
bb172083 4796 if (SvTYPE(cv) == SVt_PVCV && CvDEPTH(cv))
cea2e8a9 4797 Perl_croak(aTHX_ "Can't undef active subroutine");
8990e307 4798 ENTER;
a0d0e21e 4799
f3548bdc 4800 PAD_SAVE_SETNULLPAD();
a0d0e21e 4801
282f25c9 4802 op_free(CvROOT(cv));
5f66b61c
AL		 4803 CvROOT(cv) = NULL;
4804 CvSTART(cv) = NULL;
8990e307 4805 LEAVE;
79072805 4806 }
1d5db326 4807 SvPOK_off((SV*)cv); /* forget prototype */
a0714e2c 4808 CvGV(cv) = NULL;
a3985cdc
DM		 4809
4810 pad_undef(cv);
4811
7dafbf52
DM		 4812 /* remove CvOUTSIDE unless this is an undef rather than a free */
4813 if (!SvREFCNT(cv) && CvOUTSIDE(cv)) {
4814 if (!CvWEAKOUTSIDE(cv))
4815 SvREFCNT_dec(CvOUTSIDE(cv));
601f1833 4816 CvOUTSIDE(cv) = NULL;
7dafbf52 4817 }
beab0874
JT		 4818 if (CvCONST(cv)) {
4819 SvREFCNT_dec((SV*)CvXSUBANY(cv).any_ptr);
4820 CvCONST_off(cv);
4821 }
d04ba589 4822 if (CvISXSUB(cv) && CvXSUB(cv)) {
96a5add6 4823 CvXSUB(cv) = NULL;
50762d59 4824 }
7dafbf52
DM		 4825 /* delete all flags except WEAKOUTSIDE */
4826 CvFLAGS(cv) &= CVf_WEAKOUTSIDE;
79072805
LW		 4827}
4828
3fe9a6f1 4829void
cbf82dd0
NC		 4830Perl_cv_ckproto_len(pTHX_ const CV *cv, const GV *gv, const char *p,
4831 const STRLEN len)
4832{
4833 /* Can't just use a strcmp on the prototype, as CONSTSUBs "cheat" by
4834 relying on SvCUR, and doubling up the buffer to hold CvFILE(). */
4835 if (((!p != !SvPOK(cv)) /* One has prototype, one has not. */
4836 || (p && (len != SvCUR(cv) /* Not the same length. */
4837 || memNE(p, SvPVX_const(cv), len))))
4838 && ckWARN_d(WARN_PROTOTYPE)) {
2d03de9c 4839 SV* const msg = sv_newmortal();
a0714e2c 4840 SV* name = NULL;
3fe9a6f1 4841
4842 if (gv)
bd61b366 4843 gv_efullname3(name = sv_newmortal(), gv, NULL);
46fc3d4c 4844 sv_setpv(msg, "Prototype mismatch:");
4845 if (name)
95b63a38 4846 Perl_sv_catpvf(aTHX_ msg, " sub %"SVf, (void*)name);
3fe9a6f1 4847 if (SvPOK(cv))
95b63a38 4848 Perl_sv_catpvf(aTHX_ msg, " (%"SVf")", (void*)cv);
ebe643b9 4849 else
396482e1
GA		 4850 sv_catpvs(msg, ": none");
4851 sv_catpvs(msg, " vs ");
46fc3d4c 4852 if (p)
cbf82dd0 4853 Perl_sv_catpvf(aTHX_ msg, "(%.*s)", (int) len, p);
46fc3d4c 4854 else
396482e1 4855 sv_catpvs(msg, "none");
95b63a38 4856 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE), "%"SVf, (void*)msg);
3fe9a6f1 4857 }
4858}
4859
35f1c1c7
SB		 4860static void const_sv_xsub(pTHX_ CV* cv);
4861
beab0874 4862/*
ccfc67b7
JH		 4863
4864=head1 Optree Manipulation Functions
4865
beab0874
JT		 4866=for apidoc cv_const_sv
4867
4868If C<cv> is a constant sub eligible for inlining. returns the constant
4869value returned by the sub. Otherwise, returns NULL.
4870
4871Constant subs can be created with C<newCONSTSUB> or as described in
4872L<perlsub/"Constant Functions">.
4873
4874=cut
4875*/
760ac839 4876SV *
864dbfa3 4877Perl_cv_const_sv(pTHX_ CV *cv)
760ac839 4878{
96a5add6 4879 PERL_UNUSED_CONTEXT;
5069cc75
NC		 4880 if (!cv)
4881 return NULL;
4882 if (!(SvTYPE(cv) == SVt_PVCV || SvTYPE(cv) == SVt_PVFM))
4883 return NULL;
4884 return CvCONST(cv) ? (SV*)CvXSUBANY(cv).any_ptr : NULL;
fe5e78ed 4885}
760ac839 4886
b5c19bd7
DM		 4887/* op_const_sv: examine an optree to determine whether it's in-lineable.
4888 * Can be called in 3 ways:
4889 *
4890 * !cv
4891 * look for a single OP_CONST with attached value: return the value
4892 *
4893 * cv && CvCLONE(cv) && !CvCONST(cv)
4894 *
4895 * examine the clone prototype, and if contains only a single
4896 * OP_CONST referencing a pad const, or a single PADSV referencing
4897 * an outer lexical, return a non-zero value to indicate the CV is
4898 * a candidate for "constizing" at clone time
4899 *
4900 * cv && CvCONST(cv)
4901 *
4902 * We have just cloned an anon prototype that was marked as a const
4903 * candidiate. Try to grab the current value, and in the case of
4904 * PADSV, ignore it if it has multiple references. Return the value.
4905 */
4906
fe5e78ed 4907SV *
6867be6d 4908Perl_op_const_sv(pTHX_ const OP *o, CV *cv)
fe5e78ed 4909{
97aff369 4910 dVAR;
a0714e2c 4911 SV *sv = NULL;
fe5e78ed 4912
0f79a09d 4913 if (!o)
a0714e2c 4914 return NULL;
1c846c1f
NIS		 4915
4916 if (o->op_type == OP_LINESEQ && cLISTOPo->op_first)
fe5e78ed
GS		 4917 o = cLISTOPo->op_first->op_sibling;
4918
4919 for (; o; o = o->op_next) {
890ce7af 4920 const OPCODE type = o->op_type;
fe5e78ed 4921
1c846c1f 4922 if (sv && o->op_next == o)
fe5e78ed 4923 return sv;
e576b457
JT		 4924 if (o->op_next != o) {
4925 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
4926 continue;
4927 if (type == OP_DBSTATE)
4928 continue;
4929 }
54310121 4930 if (type == OP_LEAVESUB || type == OP_RETURN)
4931 break;
4932 if (sv)
a0714e2c 4933 return NULL;
7766f137 4934 if (type == OP_CONST && cSVOPo->op_sv)
5dc0d613 4935 sv = cSVOPo->op_sv;
b5c19bd7 4936 else if (cv && type == OP_CONST) {
dd2155a4 4937 sv = PAD_BASE_SV(CvPADLIST(cv), o->op_targ);
beab0874 4938 if (!sv)
a0714e2c 4939 return NULL;
b5c19bd7
DM		 4940 }
4941 else if (cv && type == OP_PADSV) {
4942 if (CvCONST(cv)) { /* newly cloned anon */
4943 sv = PAD_BASE_SV(CvPADLIST(cv), o->op_targ);
4944 /* the candidate should have 1 ref from this pad and 1 ref
4945 * from the parent */
4946 if (!sv || SvREFCNT(sv) != 2)
a0714e2c 4947 return NULL;
beab0874 4948 sv = newSVsv(sv);
b5c19bd7
DM		 4949 SvREADONLY_on(sv);
4950 return sv;
4951 }
4952 else {
4953 if (PAD_COMPNAME_FLAGS(o->op_targ) & SVf_FAKE)
4954 sv = &PL_sv_undef; /* an arbitrary non-null value */
beab0874 4955 }
760ac839 4956 }
b5c19bd7 4957 else {
a0714e2c 4958 return NULL;
b5c19bd7 4959 }
760ac839
LW		 4960 }
4961 return sv;
4962}
4963
eb8433b7
NC		 4964#ifdef PERL_MAD
4965OP *
4966#else
09bef843 4967void
eb8433b7 4968#endif
09bef843
SB		 4969Perl_newMYSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
4970{
99129197
NC		 4971#if 0
4972 /* This would be the return value, but the return cannot be reached. */
eb8433b7
NC		 4973 OP* pegop = newOP(OP_NULL, 0);
4974#endif
4975
46c461b5
AL		 4976 PERL_UNUSED_ARG(floor);
4977
09bef843
SB		 4978 if (o)
4979 SAVEFREEOP(o);
4980 if (proto)
4981 SAVEFREEOP(proto);
4982 if (attrs)
4983 SAVEFREEOP(attrs);
4984 if (block)
4985 SAVEFREEOP(block);
4986 Perl_croak(aTHX_ "\"my sub\" not yet implemented");
eb8433b7 4987#ifdef PERL_MAD
99129197 4988 NORETURN_FUNCTION_END;
eb8433b7 4989#endif
09bef843
SB		 4990}
4991
748a9306 4992CV *
864dbfa3 4993Perl_newSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *block)
79072805 4994{
5f66b61c 4995 return Perl_newATTRSUB(aTHX_ floor, o, proto, NULL, block);
09bef843
SB		 4996}
4997
4998CV *
4999Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
5000{
27da23d5 5001 dVAR;
6867be6d 5002 const char *aname;
83ee9e09 5003 GV *gv;
5c144d81 5004 const char *ps;
ea6e9374 5005 STRLEN ps_len;
c445ea15 5006 register CV *cv = NULL;
beab0874 5007 SV *const_sv;
b48b272a
NC		 5008 /* If the subroutine has no body, no attributes, and no builtin attributes
5009 then it's just a sub declaration, and we may be able to get away with
5010 storing with a placeholder scalar in the symbol table, rather than a
5011 full GV and CV. If anything is present then it will take a full CV to
5012 store it. */
5013 const I32 gv_fetch_flags
eb8433b7
NC		 5014 = (block || attrs || (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS)
5015 || PL_madskills)
b48b272a 5016 ? GV_ADDMULTI : GV_ADDMULTI | GV_NOINIT;
bd61b366 5017 const char * const name = o ? SvPVx_nolen_const(cSVOPo->op_sv) : NULL;
8e742a20
MHM		 5018
5019 if (proto) {
5020 assert(proto->op_type == OP_CONST);
5c144d81 5021 ps = SvPVx_const(((SVOP*)proto)->op_sv, ps_len);
8e742a20
MHM		 5022 }
5023 else
bd61b366 5024 ps = NULL;
8e742a20 5025
83ee9e09 5026 if (!name && PERLDB_NAMEANON && CopLINE(PL_curcop)) {
aec46f14 5027 SV * const sv = sv_newmortal();
c99da370
JH		 5028 Perl_sv_setpvf(aTHX_ sv, "%s[%s:%"IVdf"]",
5029 PL_curstash ? "__ANON__" : "__ANON__::__ANON__",
83ee9e09 5030 CopFILE(PL_curcop), (IV)CopLINE(PL_curcop));
b15aece3 5031 aname = SvPVX_const(sv);
83ee9e09
GS		 5032 }
5033 else
bd61b366 5034 aname = NULL;
61dbb99a 5035
61dbb99a 5036 gv = name ? gv_fetchsv(cSVOPo->op_sv, gv_fetch_flags, SVt_PVCV)
7a5fd60d
NC		 5037 : gv_fetchpv(aname ? aname
5038 : (PL_curstash ? "__ANON__" : "__ANON__::__ANON__"),
61dbb99a 5039 gv_fetch_flags, SVt_PVCV);
83ee9e09 5040
eb8433b7
NC		 5041 if (!PL_madskills) {
5042 if (o)
5043 SAVEFREEOP(o);
5044 if (proto)
5045 SAVEFREEOP(proto);
5046 if (attrs)
5047 SAVEFREEOP(attrs);
5048 }
3fe9a6f1 5049
09bef843 5050 if (SvTYPE(gv) != SVt_PVGV) { /* Maybe prototype now, and had at
55d729e4
GS		 5051 maximum a prototype before. */
5052 if (SvTYPE(gv) > SVt_NULL) {
0453d815 5053 if (!SvPOK((SV*)gv) && !(SvIOK((SV*)gv) && SvIVX((SV*)gv) == -1)
e476b1b5 5054 && ckWARN_d(WARN_PROTOTYPE))
f248d071 5055 {
9014280d 5056 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE), "Runaway prototype");
f248d071 5057 }
cbf82dd0 5058 cv_ckproto_len((CV*)gv, NULL, ps, ps_len);
55d729e4
GS		 5059 }
5060 if (ps)
ea6e9374 5061 sv_setpvn((SV*)gv, ps, ps_len);
55d729e4
GS		 5062 else
5063 sv_setiv((SV*)gv, -1);
3280af22
NIS		 5064 SvREFCNT_dec(PL_compcv);
5065 cv = PL_compcv = NULL;
5066 PL_sub_generation++;
beab0874 5067 goto done;
55d729e4
GS		 5068 }
5069
601f1833 5070 cv = (!name || GvCVGEN(gv)) ? NULL : GvCV(gv);
beab0874 5071
7fb37951
AMS		 5072#ifdef GV_UNIQUE_CHECK
5073 if (cv && GvUNIQUE(gv) && SvREADONLY(cv)) {
5074 Perl_croak(aTHX_ "Can't define subroutine %s (GV is unique)", name);
5bd07a3d
DM		 5075 }
5076#endif
5077
eb8433b7
NC		 5078 if (!block || !ps || *ps || attrs
5079 || (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS)
5080#ifdef PERL_MAD
5081 || block->op_type == OP_NULL
5082#endif
5083 )
a0714e2c 5084 const_sv = NULL;
beab0874 5085 else
601f1833 5086 const_sv = op_const_sv(block, NULL);
beab0874
JT		 5087
5088 if (cv) {
6867be6d 5089 const bool exists = CvROOT(cv) || CvXSUB(cv);
5bd07a3d 5090
7fb37951
AMS		 5091#ifdef GV_UNIQUE_CHECK
5092 if (exists && GvUNIQUE(gv)) {
5093 Perl_croak(aTHX_ "Can't redefine unique subroutine %s", name);
5bd07a3d
DM		 5094 }
5095#endif
5096
60ed1d8c
GS		 5097 /* if the subroutine doesn't exist and wasn't pre-declared
5098 * with a prototype, assume it will be AUTOLOADed,
5099 * skipping the prototype check
5100 */
5101 if (exists || SvPOK(cv))
cbf82dd0 5102 cv_ckproto_len(cv, gv, ps, ps_len);
68dc0745 5103 /* already defined (or promised)? */
60ed1d8c 5104 if (exists || GvASSUMECV(gv)) {
eb8433b7
NC		 5105 if ((!block
5106#ifdef PERL_MAD
5107 || block->op_type == OP_NULL
5108#endif
5109 )&& !attrs) {
d3cea301
SB		 5110 if (CvFLAGS(PL_compcv)) {
5111 /* might have had built-in attrs applied */
5112 CvFLAGS(cv) |= (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS);
5113 }
aa689395 5114 /* just a "sub foo;" when &foo is already defined */
3280af22 5115 SAVEFREESV(PL_compcv);
aa689395 5116 goto done;
5117 }
eb8433b7
NC		 5118 if (block
5119#ifdef PERL_MAD
5120 && block->op_type != OP_NULL
5121#endif
5122 ) {
beab0874
JT		 5123 if (ckWARN(WARN_REDEFINE)
5124 || (CvCONST(cv)
5125 && (!const_sv || sv_cmp(cv_const_sv(cv), const_sv))))
5126 {
6867be6d 5127 const line_t oldline = CopLINE(PL_curcop);
d8a34499
IK		 5128 if (PL_copline != NOLINE)
5129 CopLINE_set(PL_curcop, PL_copline);
9014280d 5130 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
beab0874
JT		 5131 CvCONST(cv) ? "Constant subroutine %s redefined"
5132 : "Subroutine %s redefined", name);
5133 CopLINE_set(PL_curcop, oldline);
5134 }
eb8433b7
NC		 5135#ifdef PERL_MAD
5136 if (!PL_minus_c) /* keep old one around for madskills */
5137#endif
5138 {
5139 /* (PL_madskills unset in used file.) */
5140 SvREFCNT_dec(cv);
5141 }
601f1833 5142 cv = NULL;
79072805 5143 }
79072805
LW		 5144 }
5145 }
beab0874 5146 if (const_sv) {
f84c484e 5147 SvREFCNT_inc_simple_void_NN(const_sv);
beab0874 5148 if (cv) {
0768512c 5149 assert(!CvROOT(cv) && !CvCONST(cv));
c69006e4 5150 sv_setpvn((SV*)cv, "", 0); /* prototype is "" */
beab0874
JT		 5151 CvXSUBANY(cv).any_ptr = const_sv;
5152 CvXSUB(cv) = const_sv_xsub;
5153 CvCONST_on(cv);
d04ba589 5154 CvISXSUB_on(cv);
beab0874
JT		 5155 }
5156 else {
601f1833 5157 GvCV(gv) = NULL;
beab0874
JT		 5158 cv = newCONSTSUB(NULL, name, const_sv);
5159 }
eb8433b7
NC		 5160 PL_sub_generation++;
5161 if (PL_madskills)
5162 goto install_block;
beab0874
JT		 5163 op_free(block);
5164 SvREFCNT_dec(PL_compcv);
5165 PL_compcv = NULL;
beab0874
JT		 5166 goto done;
5167 }
09bef843
SB		 5168 if (attrs) {
5169 HV *stash;
5170 SV *rcv;
5171
5172 /* Need to do a C<use attributes $stash_of_cv,\&cv,@attrs>
5173 * before we clobber PL_compcv.
5174 */
99129197 5175 if (cv && (!block
eb8433b7
NC		 5176#ifdef PERL_MAD
5177 || block->op_type == OP_NULL
5178#endif
5179 )) {
09bef843 5180 rcv = (SV*)cv;
020f0e03
SB		 5181 /* Might have had built-in attributes applied -- propagate them. */
5182 CvFLAGS(cv) |= (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS);
a9164de8 5183 if (CvGV(cv) && GvSTASH(CvGV(cv)))
09bef843 5184 stash = GvSTASH(CvGV(cv));
a9164de8 5185 else if (CvSTASH(cv))
09bef843
SB		 5186 stash = CvSTASH(cv);
5187 else
5188 stash = PL_curstash;
5189 }
5190 else {
5191 /* possibly about to re-define existing subr -- ignore old cv */
5192 rcv = (SV*)PL_compcv;
a9164de8 5193 if (name && GvSTASH(gv))
09bef843
SB		 5194 stash = GvSTASH(gv);
5195 else
5196 stash = PL_curstash;
5197 }
95f0a2f1 5198 apply_attrs(stash, rcv, attrs, FALSE);
09bef843 5199 }
a0d0e21e 5200 if (cv) { /* must reuse cv if autoloaded */
eb8433b7
NC		 5201 if (
5202#ifdef PERL_MAD
5203 (
5204#endif
5205 !block
5206#ifdef PERL_MAD
5207 || block->op_type == OP_NULL) && !PL_madskills
5208#endif
5209 ) {
09bef843
SB		 5210 /* got here with just attrs -- work done, so bug out */
5211 SAVEFREESV(PL_compcv);
5212 goto done;
5213 }
a3985cdc 5214 /* transfer PL_compcv to cv */
4633a7c4 5215 cv_undef(cv);
3280af22 5216 CvFLAGS(cv) = CvFLAGS(PL_compcv);
5c41a5fa
DM		 5217 if (!CvWEAKOUTSIDE(cv))
5218 SvREFCNT_dec(CvOUTSIDE(cv));
3280af22 5219 CvOUTSIDE(cv) = CvOUTSIDE(PL_compcv);
a3985cdc 5220 CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(PL_compcv);
3280af22
NIS		 5221 CvOUTSIDE(PL_compcv) = 0;
5222 CvPADLIST(cv) = CvPADLIST(PL_compcv);
5223 CvPADLIST(PL_compcv) = 0;
282f25c9 5224 /* inner references to PL_compcv must be fixed up ... */
dd2155a4 5225 pad_fixup_inner_anons(CvPADLIST(cv), PL_compcv, cv);
282f25c9 5226 /* ... before we throw it away */
3280af22 5227 SvREFCNT_dec(PL_compcv);
b5c19bd7 5228 PL_compcv = cv;
a933f601
IZ		 5229 if (PERLDB_INTER)/* Advice debugger on the new sub. */
5230 ++PL_sub_generation;
a0d0e21e
LW		 5231 }
5232 else {
3280af22 5233 cv = PL_compcv;
44a8e56a 5234 if (name) {
5235 GvCV(gv) = cv;
eb8433b7
NC		 5236 if (PL_madskills) {
5237 if (strEQ(name, "import")) {
5238 PL_formfeed = (SV*)cv;
5239 Perl_warner(aTHX_ packWARN(WARN_VOID), "%lx\n", (long)cv);
5240 }
5241 }
44a8e56a 5242 GvCVGEN(gv) = 0;
3280af22 5243 PL_sub_generation++;
44a8e56a 5244 }
a0d0e21e 5245 }
65c50114 5246 CvGV(cv) = gv;
a636914a 5247 CvFILE_set_from_cop(cv, PL_curcop);
3280af22 5248 CvSTASH(cv) = PL_curstash;
8990e307 5249
3fe9a6f1 5250 if (ps)
ea6e9374 5251 sv_setpvn((SV*)cv, ps, ps_len);
4633a7c4 5252
3280af22 5253 if (PL_error_count) {
c07a80fd 5254 op_free(block);
5f66b61c 5255 block = NULL;
68dc0745 5256 if (name) {
6867be6d 5257 const char *s = strrchr(name, ':');
68dc0745 5258 s = s ? s+1 : name;
6d4c2119 5259 if (strEQ(s, "BEGIN")) {
e1ec3a88 5260 const char not_safe[] =
6d4c2119 5261 "BEGIN not safe after errors--compilation aborted";
faef0170 5262 if (PL_in_eval & EVAL_KEEPERR)
cea2e8a9 5263 Perl_croak(aTHX_ not_safe);
6d4c2119
CS		 5264 else {
5265 /* force display of errors found but not reported */
38a03e6e 5266 sv_catpv(ERRSV, not_safe);
95b63a38 5267 Perl_croak(aTHX_ "%"SVf, (void*)ERRSV);
6d4c2119
CS		 5268 }
5269 }
68dc0745 5270 }
c07a80fd 5271 }
eb8433b7 5272 install_block:
beab0874
JT		 5273 if (!block)
5274 goto done;
a0d0e21e 5275
7766f137 5276 if (CvLVALUE(cv)) {
78f9721b
SM		 5277 CvROOT(cv) = newUNOP(OP_LEAVESUBLV, 0,
5278 mod(scalarseq(block), OP_LEAVESUBLV));
7766f137
GS		 5279 }
5280 else {
09c2fd24
AE		 5281 /* This makes sub {}; work as expected. */
5282 if (block->op_type == OP_STUB) {
1496a290 5283 OP* const newblock = newSTATEOP(0, NULL, 0);
eb8433b7
NC		 5284#ifdef PERL_MAD
5285 op_getmad(block,newblock,'B');
5286#else
09c2fd24 5287 op_free(block);
eb8433b7
NC		 5288#endif
5289 block = newblock;
09c2fd24 5290 }
7766f137
GS		 5291 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
5292 }
5293 CvROOT(cv)->op_private |= OPpREFCOUNTED;
5294 OpREFCNT_set(CvROOT(cv), 1);
5295 CvSTART(cv) = LINKLIST(CvROOT(cv));
5296 CvROOT(cv)->op_next = 0;
a2efc822 5297 CALL_PEEP(CvSTART(cv));
7766f137
GS		 5298
5299 /* now that optimizer has done its work, adjust pad values */
54310121 5300
dd2155a4
DM		 5301 pad_tidy(CvCLONE(cv) ? padtidy_SUBCLONE : padtidy_SUB);
5302
5303 if (CvCLONE(cv)) {
beab0874
JT		 5304 assert(!CvCONST(cv));
5305 if (ps && !*ps && op_const_sv(block, cv))
5306 CvCONST_on(cv);
a0d0e21e 5307 }
79072805 5308
83ee9e09 5309 if (name || aname) {
6867be6d 5310 const char *s;
0bd48802 5311 const char * const tname = (name ? name : aname);
44a8e56a 5312
3280af22 5313 if (PERLDB_SUBLINE && PL_curstash != PL_debstash) {
561b68a9 5314 SV * const sv = newSV(0);
c4420975 5315 SV * const tmpstr = sv_newmortal();
5c1737d1
NC		 5316 GV * const db_postponed = gv_fetchpvs("DB::postponed",
5317 GV_ADDMULTI, SVt_PVHV);
44a8e56a 5318 HV *hv;
5319
ed094faf
GS		 5320 Perl_sv_setpvf(aTHX_ sv, "%s:%ld-%ld",
5321 CopFILE(PL_curcop),
cc49e20b 5322 (long)PL_subline, (long)CopLINE(PL_curcop));
bd61b366 5323 gv_efullname3(tmpstr, gv, NULL);
b15aece3 5324 hv_store(GvHV(PL_DBsub), SvPVX_const(tmpstr), SvCUR(tmpstr), sv, 0);
44a8e56a 5325 hv = GvHVn(db_postponed);
551405c4
AL		 5326 if (HvFILL(hv) > 0 && hv_exists(hv, SvPVX_const(tmpstr), SvCUR(tmpstr))) {
5327 CV * const pcv = GvCV(db_postponed);
5328 if (pcv) {
5329 dSP;
5330 PUSHMARK(SP);
5331 XPUSHs(tmpstr);
5332 PUTBACK;
5333 call_sv((SV*)pcv, G_DISCARD);
5334 }
44a8e56a 5335 }
5336 }
79072805 5337
83ee9e09 5338 if ((s = strrchr(tname,':')))
28757baa 5339 s++;
5340 else
83ee9e09 5341 s = tname;
ed094faf 5342
7d30b5c4 5343 if (*s != 'B' && *s != 'E' && *s != 'C' && *s != 'I')
ed094faf
GS		 5344 goto done;
5345
7678c486 5346 if (strEQ(s, "BEGIN") && !PL_error_count) {
6867be6d 5347 const I32 oldscope = PL_scopestack_ix;
28757baa 5348 ENTER;
57843af0
GS		 5349 SAVECOPFILE(&PL_compiling);
5350 SAVECOPLINE(&PL_compiling);
28757baa 5351
3280af22
NIS		 5352 if (!PL_beginav)
5353 PL_beginav = newAV();
28757baa 5354 DEBUG_x( dump_sub(gv) );
ea2f84a3
GS		 5355 av_push(PL_beginav, (SV*)cv);
5356 GvCV(gv) = 0; /* cv has been hijacked */
3280af22 5357 call_list(oldscope, PL_beginav);
a6006777 5358
3280af22 5359 PL_curcop = &PL_compiling;
623e6609 5360 CopHINTS_set(&PL_compiling, PL_hints);
28757baa 5361 LEAVE;
5362 }
3280af22
NIS		 5363 else if (strEQ(s, "END") && !PL_error_count) {
5364 if (!PL_endav)
5365 PL_endav = newAV();
ed094faf 5366 DEBUG_x( dump_sub(gv) );
3280af22 5367 av_unshift(PL_endav, 1);
ea2f84a3
GS		 5368 av_store(PL_endav, 0, (SV*)cv);
5369 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 5370 }
7d30b5c4
GS		 5371 else if (strEQ(s, "CHECK") && !PL_error_count) {
5372 if (!PL_checkav)
5373 PL_checkav = newAV();
ed094faf 5374 DEBUG_x( dump_sub(gv) );
ddda08b7 5375 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 5376 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run CHECK block");
7d30b5c4 5377 av_unshift(PL_checkav, 1);
ea2f84a3
GS		 5378 av_store(PL_checkav, 0, (SV*)cv);
5379 GvCV(gv) = 0; /* cv has been hijacked */
4f25aa18 5380 }
3280af22
NIS		 5381 else if (strEQ(s, "INIT") && !PL_error_count) {
5382 if (!PL_initav)
5383 PL_initav = newAV();
ed094faf 5384 DEBUG_x( dump_sub(gv) );
ddda08b7 5385 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 5386 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run INIT block");
ea2f84a3
GS		 5387 av_push(PL_initav, (SV*)cv);
5388 GvCV(gv) = 0; /* cv has been hijacked */
ae77835f 5389 }
79072805 5390 }
a6006777 5391
aa689395 5392 done:
3280af22 5393 PL_copline = NOLINE;
8990e307 5394 LEAVE_SCOPE(floor);
a0d0e21e 5395 return cv;
79072805
LW		 5396}
5397
b099ddc0 5398/* XXX unsafe for threads if eval_owner isn't held */
954c1994
GS		 5399/*
5400=for apidoc newCONSTSUB
5401
5402Creates a constant sub equivalent to Perl C<sub FOO () { 123 }> which is
5403eligible for inlining at compile-time.
5404
5405=cut
5406*/
5407
beab0874 5408CV *
e1ec3a88 5409Perl_newCONSTSUB(pTHX_ HV *stash, const char *name, SV *sv)
5476c433 5410{
27da23d5 5411 dVAR;
beab0874 5412 CV* cv;
cbf82dd0
NC		 5413#ifdef USE_ITHREADS
5414 const char *const temp_p = CopFILE(PL_curcop);
07fcac01 5415 const STRLEN len = temp_p ? strlen(temp_p) : 0;
cbf82dd0
NC		 5416#else
5417 SV *const temp_sv = CopFILESV(PL_curcop);
5418 STRLEN len;
5419 const char *const temp_p = temp_sv ? SvPV_const(temp_sv, len) : NULL;
5420#endif
07fcac01 5421 char *const file = savepvn(temp_p, temp_p ? len : 0);
5476c433 5422
11faa288 5423 ENTER;
11faa288 5424
f4dd75d9 5425 SAVECOPLINE(PL_curcop);
11faa288 5426 CopLINE_set(PL_curcop, PL_copline);
f4dd75d9
GS		 5427
5428 SAVEHINTS();
3280af22 5429 PL_hints &= ~HINT_BLOCK_SCOPE;
11faa288
GS		 5430
5431 if (stash) {
5432 SAVESPTR(PL_curstash);
5433 SAVECOPSTASH(PL_curcop);
5434 PL_curstash = stash;
05ec9bb3 5435 CopSTASH_set(PL_curcop,stash);
11faa288 5436 }
5476c433 5437
cbf82dd0
NC		 5438 /* file becomes the CvFILE. For an XS, it's supposed to be static storage,
5439 and so doesn't get free()d. (It's expected to be from the C pre-
5440 processor __FILE__ directive). But we need a dynamically allocated one,
77004dee
NC		 5441 and we need it to get freed. */
5442 cv = newXS_flags(name, const_sv_xsub, file, "", XS_DYNAMIC_FILENAME);
beab0874
JT		 5443 CvXSUBANY(cv).any_ptr = sv;
5444 CvCONST_on(cv);
5476c433 5445
65e66c80 5446#ifdef USE_ITHREADS
02f28d44
MHM		 5447 if (stash)
5448 CopSTASH_free(PL_curcop);
65e66c80 5449#endif
11faa288 5450 LEAVE;
beab0874
JT		 5451
5452 return cv;
5476c433
JD		 5453}
5454
77004dee
NC		 5455CV *
5456Perl_newXS_flags(pTHX_ const char *name, XSUBADDR_t subaddr,
5457 const char *const filename, const char *const proto,
5458 U32 flags)
5459{
5460 CV *cv = newXS(name, subaddr, filename);
5461
5462 if (flags & XS_DYNAMIC_FILENAME) {
5463 /* We need to "make arrangements" (ie cheat) to ensure that the
5464 filename lasts as long as the PVCV we just created, but also doesn't
5465 leak */
5466 STRLEN filename_len = strlen(filename);
5467 STRLEN proto_and_file_len = filename_len;
5468 char *proto_and_file;
5469 STRLEN proto_len;
5470
5471 if (proto) {
5472 proto_len = strlen(proto);
5473 proto_and_file_len += proto_len;
5474
5475 Newx(proto_and_file, proto_and_file_len + 1, char);
5476 Copy(proto, proto_and_file, proto_len, char);
5477 Copy(filename, proto_and_file + proto_len, filename_len + 1, char);
5478 } else {
5479 proto_len = 0;
5480 proto_and_file = savepvn(filename, filename_len);
5481 }
5482
5483 /* This gets free()d. :-) */
5484 sv_usepvn_flags((SV*)cv, proto_and_file, proto_and_file_len,
5485 SV_HAS_TRAILING_NUL);
5486 if (proto) {
5487 /* This gives us the correct prototype, rather than one with the
5488 file name appended. */
5489 SvCUR_set(cv, proto_len);
5490 } else {
5491 SvPOK_off(cv);
5492 }
81a2b3b6 5493 CvFILE(cv) = proto_and_file + proto_len;
77004dee
NC		 5494 } else {
5495 sv_setpv((SV *)cv, proto);
5496 }
5497 return cv;
5498}
5499
954c1994
GS		 5500/*
5501=for apidoc U||newXS
5502
77004dee
NC		 5503Used by C<xsubpp> to hook up XSUBs as Perl subs. I<filename> needs to be
5504static storage, as it is used directly as CvFILE(), without a copy being made.
954c1994
GS		 5505
5506=cut
5507*/
5508
57d3b86d 5509CV *
bfed75c6 5510Perl_newXS(pTHX_ const char *name, XSUBADDR_t subaddr, const char *filename)
a0d0e21e 5511{
97aff369 5512 dVAR;
9a957fbc 5513 GV * const gv = gv_fetchpv(name ? name :
c99da370
JH		 5514 (PL_curstash ? "__ANON__" : "__ANON__::__ANON__"),
5515 GV_ADDMULTI, SVt_PVCV);
79072805 5516 register CV *cv;
44a8e56a 5517
1ecdd9a8
HS		 5518 if (!subaddr)
5519 Perl_croak(aTHX_ "panic: no address for '%s' in '%s'", name, filename);
5520
601f1833 5521 if ((cv = (name ? GvCV(gv) : NULL))) {
44a8e56a 5522 if (GvCVGEN(gv)) {
5523 /* just a cached method */
5524 SvREFCNT_dec(cv);
601f1833 5525 cv = NULL;
44a8e56a 5526 }
5527 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
5528 /* already defined (or promised) */
1df70142 5529 /* XXX It's possible for this HvNAME_get to return null, and get passed into strEQ */
66a1b24b
AL		 5530 if (ckWARN(WARN_REDEFINE)) {
5531 GV * const gvcv = CvGV(cv);
5532 if (gvcv) {
5533 HV * const stash = GvSTASH(gvcv);
5534 if (stash) {
8b38226b
AL		 5535 const char *redefined_name = HvNAME_get(stash);
5536 if ( strEQ(redefined_name,"autouse") ) {
66a1b24b
AL		 5537 const line_t oldline = CopLINE(PL_curcop);
5538 if (PL_copline != NOLINE)
5539 CopLINE_set(PL_curcop, PL_copline);
5540 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
5541 CvCONST(cv) ? "Constant subroutine %s redefined"
5542 : "Subroutine %s redefined"
5543 ,name);
5544 CopLINE_set(PL_curcop, oldline);
5545 }
5546 }
5547 }
a0d0e21e
LW		 5548 }
5549 SvREFCNT_dec(cv);
601f1833 5550 cv = NULL;
79072805 5551 }
79072805 5552 }
44a8e56a 5553
5554 if (cv) /* must reuse cv if autoloaded */
5555 cv_undef(cv);
a0d0e21e 5556 else {
561b68a9 5557 cv = (CV*)newSV(0);
a0d0e21e 5558 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 5559 if (name) {
5560 GvCV(gv) = cv;
5561 GvCVGEN(gv) = 0;
3280af22 5562 PL_sub_generation++;
44a8e56a 5563 }
a0d0e21e 5564 }
65c50114 5565 CvGV(cv) = gv;
b195d487 5566 (void)gv_fetchfile(filename);
dd374669 5567 CvFILE(cv) = (char *)filename; /* NOTE: not copied, as it is expected to be
57843af0 5568 an external constant string */
d04ba589 5569 CvISXSUB_on(cv);
a0d0e21e 5570 CvXSUB(cv) = subaddr;
44a8e56a 5571
28757baa 5572 if (name) {
e1ec3a88 5573 const char *s = strrchr(name,':');
28757baa 5574 if (s)
5575 s++;
5576 else
5577 s = name;
ed094faf 5578
7d30b5c4 5579 if (*s != 'B' && *s != 'E' && *s != 'C' && *s != 'I')
ed094faf
GS		 5580 goto done;
5581
28757baa 5582 if (strEQ(s, "BEGIN")) {
3280af22
NIS		 5583 if (!PL_beginav)
5584 PL_beginav = newAV();
ea2f84a3
GS		 5585 av_push(PL_beginav, (SV*)cv);
5586 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 5587 }
5588 else if (strEQ(s, "END")) {
3280af22
NIS		 5589 if (!PL_endav)
5590 PL_endav = newAV();
5591 av_unshift(PL_endav, 1);
ea2f84a3
GS		 5592 av_store(PL_endav, 0, (SV*)cv);
5593 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 5594 }
7d30b5c4
GS		 5595 else if (strEQ(s, "CHECK")) {
5596 if (!PL_checkav)
5597 PL_checkav = newAV();
ddda08b7 5598 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 5599 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run CHECK block");
7d30b5c4 5600 av_unshift(PL_checkav, 1);
ea2f84a3
GS		 5601 av_store(PL_checkav, 0, (SV*)cv);
5602 GvCV(gv) = 0; /* cv has been hijacked */
4f25aa18 5603 }
7d07dbc2 5604 else if (strEQ(s, "INIT")) {
3280af22
NIS		 5605 if (!PL_initav)
5606 PL_initav = newAV();
ddda08b7 5607 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 5608 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run INIT block");
ea2f84a3
GS		 5609 av_push(PL_initav, (SV*)cv);
5610 GvCV(gv) = 0; /* cv has been hijacked */
ae77835f 5611 }
28757baa 5612 }
8990e307 5613 else
a5f75d66 5614 CvANON_on(cv);
44a8e56a 5615
ed094faf 5616done:
a0d0e21e 5617 return cv;
79072805
LW		 5618}
5619
eb8433b7
NC		 5620#ifdef PERL_MAD
5621OP *
5622#else
79072805 5623void
eb8433b7 5624#endif
864dbfa3 5625Perl_newFORM(pTHX_ I32 floor, OP *o, OP *block)
79072805 5626{
97aff369 5627 dVAR;
79072805 5628 register CV *cv;
eb8433b7
NC		 5629#ifdef PERL_MAD
5630 OP* pegop = newOP(OP_NULL, 0);
5631#endif
79072805 5632
0bd48802 5633 GV * const gv = o
f776e3cd 5634 ? gv_fetchsv(cSVOPo->op_sv, GV_ADD, SVt_PVFM)
fafc274c 5635 : gv_fetchpvs("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVFM);
0bd48802 5636
7fb37951
AMS		 5637#ifdef GV_UNIQUE_CHECK
5638 if (GvUNIQUE(gv)) {
5639 Perl_croak(aTHX_ "Bad symbol for form (GV is unique)");
5bd07a3d
DM		 5640 }
5641#endif
a5f75d66 5642 GvMULTI_on(gv);
155aba94 5643 if ((cv = GvFORM(gv))) {
599cee73 5644 if (ckWARN(WARN_REDEFINE)) {
6867be6d 5645 const line_t oldline = CopLINE(PL_curcop);
d8a34499
IK		 5646 if (PL_copline != NOLINE)
5647 CopLINE_set(PL_curcop, PL_copline);
7a5fd60d
NC		 5648 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
5649 o ? "Format %"SVf" redefined"
95b63a38 5650 : "Format STDOUT redefined", (void*)cSVOPo->op_sv);
57843af0 5651 CopLINE_set(PL_curcop, oldline);
79072805 5652 }
8990e307 5653 SvREFCNT_dec(cv);
79072805 5654 }
3280af22 5655 cv = PL_compcv;
79072805 5656 GvFORM(gv) = cv;
65c50114 5657 CvGV(cv) = gv;
a636914a 5658 CvFILE_set_from_cop(cv, PL_curcop);
79072805 5659
a0d0e21e 5660
dd2155a4 5661 pad_tidy(padtidy_FORMAT);
79072805 5662 CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
7934575e
GS		 5663 CvROOT(cv)->op_private |= OPpREFCOUNTED;
5664 OpREFCNT_set(CvROOT(cv), 1);
79072805
LW		 5665 CvSTART(cv) = LINKLIST(CvROOT(cv));
5666 CvROOT(cv)->op_next = 0;
a2efc822 5667 CALL_PEEP(CvSTART(cv));
eb8433b7
NC		 5668#ifdef PERL_MAD
5669 op_getmad(o,pegop,'n');
5670 op_getmad_weak(block, pegop, 'b');
5671#else
11343788 5672 op_free(o);
eb8433b7 5673#endif
3280af22 5674 PL_copline = NOLINE;
8990e307 5675 LEAVE_SCOPE(floor);
eb8433b7
NC		 5676#ifdef PERL_MAD
5677 return pegop;
5678#endif
79072805
LW		 5679}
5680
5681OP *
864dbfa3 5682Perl_newANONLIST(pTHX_ OP *o)
79072805 5683{
93a17b20 5684 return newUNOP(OP_REFGEN, 0,
11343788 5685 mod(list(convert(OP_ANONLIST, 0, o)), OP_REFGEN));
79072805
LW		 5686}
5687
5688OP *
864dbfa3 5689Perl_newANONHASH(pTHX_ OP *o)
79072805 5690{
93a17b20 5691 return newUNOP(OP_REFGEN, 0,
11343788 5692 mod(list(convert(OP_ANONHASH, 0, o)), OP_REFGEN));
a0d0e21e
LW		 5693}
5694
5695OP *
864dbfa3 5696Perl_newANONSUB(pTHX_ I32 floor, OP *proto, OP *block)
a0d0e21e 5697{
5f66b61c 5698 return newANONATTRSUB(floor, proto, NULL, block);
09bef843
SB		 5699}
5700
5701OP *
5702Perl_newANONATTRSUB(pTHX_ I32 floor, OP *proto, OP *attrs, OP *block)
5703{
a0d0e21e 5704 return newUNOP(OP_REFGEN, 0,
09bef843
SB		 5705 newSVOP(OP_ANONCODE, 0,
5706 (SV*)newATTRSUB(floor, 0, proto, attrs, block)));
79072805
LW		 5707}
5708
5709OP *
864dbfa3 5710Perl_oopsAV(pTHX_ OP *o)
79072805 5711{
27da23d5 5712 dVAR;
ed6116ce
LW		 5713 switch (o->op_type) {
5714 case OP_PADSV:
5715 o->op_type = OP_PADAV;
22c35a8c 5716 o->op_ppaddr = PL_ppaddr[OP_PADAV];
51e247a3 5717 return ref(o, OP_RV2AV);
b2ffa427 5718
ed6116ce 5719 case OP_RV2SV:
79072805 5720 o->op_type = OP_RV2AV;
22c35a8c 5721 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
79072805 5722 ref(o, OP_RV2AV);
ed6116ce
LW		 5723 break;
5724
5725 default:
0453d815 5726 if (ckWARN_d(WARN_INTERNAL))
9014280d 5727 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "oops: oopsAV");
ed6116ce
LW		 5728 break;
5729 }
79072805
LW		 5730 return o;
5731}
5732
5733OP *
864dbfa3 5734Perl_oopsHV(pTHX_ OP *o)
79072805 5735{
27da23d5 5736 dVAR;
ed6116ce
LW		 5737 switch (o->op_type) {
5738 case OP_PADSV:
5739 case OP_PADAV:
5740 o->op_type = OP_PADHV;
22c35a8c 5741 o->op_ppaddr = PL_ppaddr[OP_PADHV];
51e247a3 5742 return ref(o, OP_RV2HV);
ed6116ce
LW		 5743
5744 case OP_RV2SV:
5745 case OP_RV2AV:
79072805 5746 o->op_type = OP_RV2HV;
22c35a8c 5747 o->op_ppaddr = PL_ppaddr[OP_RV2HV];
79072805 5748 ref(o, OP_RV2HV);
ed6116ce
LW		 5749 break;
5750
5751 default:
0453d815 5752 if (ckWARN_d(WARN_INTERNAL))
9014280d 5753 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "oops: oopsHV");
ed6116ce
LW		 5754 break;
5755 }
79072805
LW		 5756 return o;
5757}
5758
5759OP *
864dbfa3 5760Perl_newAVREF(pTHX_ OP *o)
79072805 5761{
27da23d5 5762 dVAR;
ed6116ce
LW		 5763 if (o->op_type == OP_PADANY) {
5764 o->op_type = OP_PADAV;
22c35a8c 5765 o->op_ppaddr = PL_ppaddr[OP_PADAV];
93a17b20 5766 return o;
ed6116ce 5767 }
a1063b2d 5768 else if ((o->op_type == OP_RV2AV || o->op_type == OP_PADAV)
9014280d
PM		 5769 && ckWARN(WARN_DEPRECATED)) {
5770 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
a1063b2d
RH		 5771 "Using an array as a reference is deprecated");
5772 }
79072805
LW		 5773 return newUNOP(OP_RV2AV, 0, scalar(o));
5774}
5775
5776OP *
864dbfa3 5777Perl_newGVREF(pTHX_ I32 type, OP *o)
79072805 5778{
82092f1d 5779 if (type == OP_MAPSTART || type == OP_GREPSTART || type == OP_SORT)
a0d0e21e 5780 return newUNOP(OP_NULL, 0, o);
748a9306 5781 return ref(newUNOP(OP_RV2GV, OPf_REF, o), type);
79072805
LW		 5782}
5783
5784OP *
864dbfa3 5785Perl_newHVREF(pTHX_ OP *o)
79072805 5786{
27da23d5 5787 dVAR;
ed6116ce
LW		 5788 if (o->op_type == OP_PADANY) {
5789 o->op_type = OP_PADHV;
22c35a8c 5790 o->op_ppaddr = PL_ppaddr[OP_PADHV];
93a17b20 5791 return o;
ed6116ce 5792 }
a1063b2d 5793 else if ((o->op_type == OP_RV2HV || o->op_type == OP_PADHV)
9014280d
PM		 5794 && ckWARN(WARN_DEPRECATED)) {
5795 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
a1063b2d
RH		 5796 "Using a hash as a reference is deprecated");
5797 }
79072805
LW		 5798 return newUNOP(OP_RV2HV, 0, scalar(o));
5799}
5800
5801OP *
864dbfa3 5802Perl_newCVREF(pTHX_ I32 flags, OP *o)
79072805 5803{
c07a80fd 5804 return newUNOP(OP_RV2CV, flags, scalar(o));
79072805
LW		 5805}
5806
5807OP *
864dbfa3 5808Perl_newSVREF(pTHX_ OP *o)
79072805 5809{
27da23d5 5810 dVAR;
ed6116ce
LW		 5811 if (o->op_type == OP_PADANY) {
5812 o->op_type = OP_PADSV;
22c35a8c 5813 o->op_ppaddr = PL_ppaddr[OP_PADSV];
93a17b20 5814 return o;
ed6116ce 5815 }
224a4551
MB		 5816 else if (o->op_type == OP_THREADSV && !(o->op_flags & OPpDONE_SVREF)) {
5817 o->op_flags |= OPpDONE_SVREF;
a863c7d1 5818 return o;
224a4551 5819 }
79072805
LW		 5820 return newUNOP(OP_RV2SV, 0, scalar(o));
5821}
5822
61b743bb
DM		 5823/* Check routines. See the comments at the top of this file for details
5824 * on when these are called */
79072805
LW		 5825
5826OP *
cea2e8a9 5827Perl_ck_anoncode(pTHX_ OP *o)
5f05dabc 5828{
dd2155a4 5829 cSVOPo->op_targ = pad_add_anon(cSVOPo->op_sv, o->op_type);
eb8433b7 5830 if (!PL_madskills)
1d866c12 5831 cSVOPo->op_sv = NULL;
5dc0d613 5832 return o;
5f05dabc 5833}
5834
5835OP *
cea2e8a9 5836Perl_ck_bitop(pTHX_ OP *o)
55497cff 5837{
97aff369 5838 dVAR;
276b2a0c
RGS		 5839#define OP_IS_NUMCOMPARE(op) \
5840 ((op) == OP_LT || (op) == OP_I_LT || \
5841 (op) == OP_GT || (op) == OP_I_GT || \
5842 (op) == OP_LE || (op) == OP_I_LE || \
5843 (op) == OP_GE || (op) == OP_I_GE || \
5844 (op) == OP_EQ || (op) == OP_I_EQ || \
5845 (op) == OP_NE || (op) == OP_I_NE || \
5846 (op) == OP_NCMP || (op) == OP_I_NCMP)
d5ec2987 5847 o->op_private = (U8)(PL_hints & HINT_INTEGER);
2b84528b
RGS		 5848 if (!(o->op_flags & OPf_STACKED) /* Not an assignment */
5849 && (o->op_type == OP_BIT_OR
5850 || o->op_type == OP_BIT_AND
5851 || o->op_type == OP_BIT_XOR))
276b2a0c 5852 {
1df70142
AL		 5853 const OP * const left = cBINOPo->op_first;
5854 const OP * const right = left->op_sibling;
96a925ab
YST		 5855 if ((OP_IS_NUMCOMPARE(left->op_type) &&
5856 (left->op_flags & OPf_PARENS) == 0) ||
5857 (OP_IS_NUMCOMPARE(right->op_type) &&
5858 (right->op_flags & OPf_PARENS) == 0))
276b2a0c
RGS		 5859 if (ckWARN(WARN_PRECEDENCE))
5860 Perl_warner(aTHX_ packWARN(WARN_PRECEDENCE),
5861 "Possible precedence problem on bitwise %c operator",
5862 o->op_type == OP_BIT_OR ? '|'
5863 : o->op_type == OP_BIT_AND ? '&' : '^'
5864 );
5865 }
5dc0d613 5866 return o;
55497cff 5867}
5868
5869OP *
cea2e8a9 5870Perl_ck_concat(pTHX_ OP *o)
79072805 5871{
0bd48802 5872 const OP * const kid = cUNOPo->op_first;
96a5add6 5873 PERL_UNUSED_CONTEXT;
df91b2c5
AE		 5874 if (kid->op_type == OP_CONCAT && !(kid->op_private & OPpTARGET_MY) &&
5875 !(kUNOP->op_first->op_flags & OPf_MOD))
0165acc7 5876 o->op_flags |= OPf_STACKED;
11343788 5877 return o;
79072805
LW		 5878}
5879
5880OP *
cea2e8a9 5881Perl_ck_spair(pTHX_ OP *o)
79072805 5882{
27da23d5 5883 dVAR;
11343788 5884 if (o->op_flags & OPf_KIDS) {
79072805 5885 OP* newop;
a0d0e21e 5886 OP* kid;
6867be6d 5887 const OPCODE type = o->op_type;
5dc0d613 5888 o = modkids(ck_fun(o), type);
11343788 5889 kid = cUNOPo->op_first;
a0d0e21e 5890 newop = kUNOP->op_first->op_sibling;
1496a290
AL		 5891 if (newop) {
5892 const OPCODE type = newop->op_type;
5893 if (newop->op_sibling || !(PL_opargs[type] & OA_RETSCALAR) ||
5894 type == OP_PADAV || type == OP_PADHV ||
5895 type == OP_RV2AV || type == OP_RV2HV)
5896 return o;
a0d0e21e 5897 }
eb8433b7
NC		 5898#ifdef PERL_MAD
5899 op_getmad(kUNOP->op_first,newop,'K');
5900#else
a0d0e21e 5901 op_free(kUNOP->op_first);
eb8433b7 5902#endif
a0d0e21e
LW		 5903 kUNOP->op_first = newop;
5904 }
22c35a8c 5905 o->op_ppaddr = PL_ppaddr[++o->op_type];
11343788 5906 return ck_fun(o);
a0d0e21e
LW		 5907}
5908
5909OP *
cea2e8a9 5910Perl_ck_delete(pTHX_ OP *o)
a0d0e21e 5911{
11343788 5912 o = ck_fun(o);
5dc0d613 5913 o->op_private = 0;
11343788 5914 if (o->op_flags & OPf_KIDS) {
551405c4 5915 OP * const kid = cUNOPo->op_first;
01020589
GS		 5916 switch (kid->op_type) {
5917 case OP_ASLICE:
5918 o->op_flags |= OPf_SPECIAL;
5919 /* FALL THROUGH */
5920 case OP_HSLICE:
5dc0d613 5921 o->op_private |= OPpSLICE;
01020589
GS		 5922 break;
5923 case OP_AELEM:
5924 o->op_flags |= OPf_SPECIAL;
5925 /* FALL THROUGH */
5926 case OP_HELEM:
5927 break;
5928 default:
5929 Perl_croak(aTHX_ "%s argument is not a HASH or ARRAY element or slice",
53e06cf0 5930 OP_DESC(o));
01020589 5931 }
93c66552 5932 op_null(kid);
79072805 5933 }
11343788 5934 return o;
79072805
LW		 5935}
5936
5937OP *
96e176bf
CL		 5938Perl_ck_die(pTHX_ OP *o)
5939{
5940#ifdef VMS
5941 if (VMSISH_HUSHED) o->op_private |= OPpHUSH_VMSISH;
5942#endif
5943 return ck_fun(o);
5944}
5945
5946OP *
cea2e8a9 5947Perl_ck_eof(pTHX_ OP *o)
79072805 5948{
97aff369 5949 dVAR;
79072805 5950
11343788
MB		 5951 if (o->op_flags & OPf_KIDS) {
5952 if (cLISTOPo->op_first->op_type == OP_STUB) {
1d866c12
AL		 5953 OP * const newop
5954 = newUNOP(o->op_type, OPf_SPECIAL, newGVOP(OP_GV, 0, PL_argvgv));
eb8433b7
NC		 5955#ifdef PERL_MAD
5956 op_getmad(o,newop,'O');
5957#else
11343788 5958 op_free(o);
eb8433b7
NC		 5959#endif
5960 o = newop;
8990e307 5961 }
11343788 5962 return ck_fun(o);
79072805 5963 }
11343788 5964 return o;
79072805
LW		 5965}
5966
5967OP *
cea2e8a9 5968Perl_ck_eval(pTHX_ OP *o)
79072805 5969{
27da23d5 5970 dVAR;
3280af22 5971 PL_hints |= HINT_BLOCK_SCOPE;
11343788 5972 if (o->op_flags & OPf_KIDS) {
46c461b5 5973 SVOP * const kid = (SVOP*)cUNOPo->op_first;
79072805 5974
93a17b20 5975 if (!kid) {
11343788 5976 o->op_flags &= ~OPf_KIDS;
93c66552 5977 op_null(o);
79072805 5978 }
b14574b4 5979 else if (kid->op_type == OP_LINESEQ || kid->op_type == OP_STUB) {
79072805 5980 LOGOP *enter;
eb8433b7 5981#ifdef PERL_MAD
1d866c12 5982 OP* const oldo = o;
eb8433b7 5983#endif
79072805 5984
11343788 5985 cUNOPo->op_first = 0;
eb8433b7 5986#ifndef PERL_MAD
11343788 5987 op_free(o);
eb8433b7 5988#endif
79072805 5989
b7dc083c 5990 NewOp(1101, enter, 1, LOGOP);
79072805 5991 enter->op_type = OP_ENTERTRY;
22c35a8c 5992 enter->op_ppaddr = PL_ppaddr[OP_ENTERTRY];
79072805
LW		 5993 enter->op_private = 0;
5994
5995 /* establish postfix order */
5996 enter->op_next = (OP*)enter;
5997
11343788
MB		 5998 o = prepend_elem(OP_LINESEQ, (OP*)enter, (OP*)kid);
5999 o->op_type = OP_LEAVETRY;
22c35a8c 6000 o->op_ppaddr = PL_ppaddr[OP_LEAVETRY];
11343788 6001 enter->op_other = o;
eb8433b7 6002 op_getmad(oldo,o,'O');
11343788 6003 return o;
79072805 6004 }
b5c19bd7 6005 else {
473986ff 6006 scalar((OP*)kid);
b5c19bd7
DM		 6007 PL_cv_has_eval = 1;
6008 }
79072805
LW		 6009 }
6010 else {
eb8433b7 6011#ifdef PERL_MAD
1d866c12 6012 OP* const oldo = o;
eb8433b7 6013#else
11343788 6014 op_free(o);
eb8433b7 6015#endif
54b9620d 6016 o = newUNOP(OP_ENTEREVAL, 0, newDEFSVOP());
eb8433b7 6017 op_getmad(oldo,o,'O');
79072805 6018 }
3280af22 6019 o->op_targ = (PADOFFSET)PL_hints;
7168684c 6020 if ((PL_hints & HINT_LOCALIZE_HH) != 0 && GvHV(PL_hintgv)) {
0d863452 6021 /* Store a copy of %^H that pp_entereval can pick up */
5b9c0671
NC		 6022 OP *hhop = newSVOP(OP_CONST, 0,
6023 (SV*)Perl_hv_copy_hints_hv(aTHX_ GvHV(PL_hintgv)));
0d863452
RH		 6024 cUNOPo->op_first->op_sibling = hhop;
6025 o->op_private |= OPpEVAL_HAS_HH;
6026 }
11343788 6027 return o;
79072805
LW		 6028}
6029
6030OP *
d98f61e7
GS		 6031Perl_ck_exit(pTHX_ OP *o)
6032{
6033#ifdef VMS
551405c4 6034 HV * const table = GvHV(PL_hintgv);
d98f61e7 6035 if (table) {
a4fc7abc 6036 SV * const * const svp = hv_fetchs(table, "vmsish_exit", FALSE);
d98f61e7
GS		 6037 if (svp && *svp && SvTRUE(*svp))
6038 o->op_private |= OPpEXIT_VMSISH;
6039 }
96e176bf 6040 if (VMSISH_HUSHED) o->op_private |= OPpHUSH_VMSISH;
d98f61e7
GS		 6041#endif
6042 return ck_fun(o);
6043}
6044
6045OP *
cea2e8a9 6046Perl_ck_exec(pTHX_ OP *o)
79072805 6047{
11343788 6048 if (o->op_flags & OPf_STACKED) {
6867be6d 6049 OP *kid;
11343788
MB		 6050 o = ck_fun(o);
6051 kid = cUNOPo->op_first->op_sibling;
8990e307 6052 if (kid->op_type == OP_RV2GV)
93c66552 6053 op_null(kid);
79072805 6054 }
463ee0b2 6055 else
11343788
MB		 6056 o = listkids(o);
6057 return o;
79072805
LW		 6058}
6059
6060OP *
cea2e8a9 6061Perl_ck_exists(pTHX_ OP *o)
5f05dabc 6062{
97aff369 6063 dVAR;
5196be3e
MB		 6064 o = ck_fun(o);
6065 if (o->op_flags & OPf_KIDS) {
46c461b5 6066 OP * const kid = cUNOPo->op_first;
afebc493
GS		 6067 if (kid->op_type == OP_ENTERSUB) {
6068 (void) ref(kid, o->op_type);
6069 if (kid->op_type != OP_RV2CV && !PL_error_count)
6070 Perl_croak(aTHX_ "%s argument is not a subroutine name",
53e06cf0 6071 OP_DESC(o));
afebc493
GS		 6072 o->op_private |= OPpEXISTS_SUB;
6073 }
6074 else if (kid->op_type == OP_AELEM)
01020589
GS		 6075 o->op_flags |= OPf_SPECIAL;
6076 else if (kid->op_type != OP_HELEM)
6077 Perl_croak(aTHX_ "%s argument is not a HASH or ARRAY element",
53e06cf0 6078 OP_DESC(o));
93c66552 6079 op_null(kid);
5f05dabc 6080 }
5196be3e 6081 return o;
5f05dabc 6082}
6083
79072805 6084OP *
cea2e8a9 6085Perl_ck_rvconst(pTHX_ register OP *o)
79072805 6086{
27da23d5 6087 dVAR;
0bd48802 6088 SVOP * const kid = (SVOP*)cUNOPo->op_first;
85e6fe83 6089
3280af22 6090 o->op_private |= (PL_hints & HINT_STRICT_REFS);
e26df76a
NC		 6091 if (o->op_type == OP_RV2CV)
6092 o->op_private &= ~1;
6093
79072805 6094 if (kid->op_type == OP_CONST) {
44a8e56a 6095 int iscv;
6096 GV *gv;
504618e9 6097 SV * const kidsv = kid->op_sv;
44a8e56a 6098
779c5bc9
GS		 6099 /* Is it a constant from cv_const_sv()? */
6100 if (SvROK(kidsv) && SvREADONLY(kidsv)) {
0bd48802 6101 SV * const rsv = SvRV(kidsv);
42d0e0b7 6102 const svtype type = SvTYPE(rsv);
bd61b366 6103 const char *badtype = NULL;
779c5bc9
GS		 6104
6105 switch (o->op_type) {
6106 case OP_RV2SV:
42d0e0b7 6107 if (type > SVt_PVMG)
779c5bc9
GS		 6108 badtype = "a SCALAR";
6109 break;
6110 case OP_RV2AV:
42d0e0b7 6111 if (type != SVt_PVAV)
779c5bc9
GS		 6112 badtype = "an ARRAY";
6113 break;
6114 case OP_RV2HV:
42d0e0b7 6115 if (type != SVt_PVHV)
779c5bc9 6116 badtype = "a HASH";
779c5bc9
GS		 6117 break;
6118 case OP_RV2CV:
42d0e0b7 6119 if (type != SVt_PVCV)
779c5bc9
GS		 6120 badtype = "a CODE";
6121 break;
6122 }
6123 if (badtype)
cea2e8a9 6124 Perl_croak(aTHX_ "Constant is not %s reference", badtype);
779c5bc9
GS		 6125 return o;
6126 }
ce10b5d1
RGS		 6127 else if ((o->op_type == OP_RV2HV || o->op_type == OP_RV2SV) &&
6128 (PL_hints & HINT_STRICT_REFS) && SvPOK(kidsv)) {
6129 /* If this is an access to a stash, disable "strict refs", because
6130 * stashes aren't auto-vivified at compile-time (unless we store
6131 * symbols in them), and we don't want to produce a run-time
6132 * stricture error when auto-vivifying the stash. */
6133 const char *s = SvPV_nolen(kidsv);
6134 const STRLEN l = SvCUR(kidsv);
6135 if (l > 1 && s[l-1] == ':' && s[l-2] == ':')
6136 o->op_private &= ~HINT_STRICT_REFS;
6137 }
6138 if ((o->op_private & HINT_STRICT_REFS) && (kid->op_private & OPpCONST_BARE)) {
5f66b61c 6139 const char *badthing;
5dc0d613 6140 switch (o->op_type) {
44a8e56a 6141 case OP_RV2SV:
6142 badthing = "a SCALAR";
6143 break;
6144 case OP_RV2AV:
6145 badthing = "an ARRAY";
6146 break;
6147 case OP_RV2HV:
6148 badthing = "a HASH";
6149 break;
5f66b61c
AL		 6150 default:
6151 badthing = NULL;
6152 break;
44a8e56a 6153 }
6154 if (badthing)
1c846c1f 6155 Perl_croak(aTHX_
95b63a38
JH		 6156 "Can't use bareword (\"%"SVf"\") as %s ref while \"strict refs\" in use",
6157 (void*)kidsv, badthing);
44a8e56a 6158 }
93233ece
CS		 6159 /*
6160 * This is a little tricky. We only want to add the symbol if we
6161 * didn't add it in the lexer. Otherwise we get duplicate strict
6162 * warnings. But if we didn't add it in the lexer, we must at
6163 * least pretend like we wanted to add it even if it existed before,
6164 * or we get possible typo warnings. OPpCONST_ENTERED says
6165 * whether the lexer already added THIS instance of this symbol.
6166 */
5196be3e 6167 iscv = (o->op_type == OP_RV2CV) * 2;
93233ece 6168 do {
7a5fd60d 6169 gv = gv_fetchsv(kidsv,
748a9306 6170 iscv | !(kid->op_private & OPpCONST_ENTERED),
a0d0e21e
LW		 6171 iscv
6172 ? SVt_PVCV
11343788 6173 : o->op_type == OP_RV2SV
a0d0e21e 6174 ? SVt_PV
11343788 6175 : o->op_type == OP_RV2AV
a0d0e21e 6176 ? SVt_PVAV
11343788 6177 : o->op_type == OP_RV2HV
a0d0e21e
LW		 6178 ? SVt_PVHV
6179 : SVt_PVGV);
93233ece
CS		 6180 } while (!gv && !(kid->op_private & OPpCONST_ENTERED) && !iscv++);
6181 if (gv) {
6182 kid->op_type = OP_GV;
6183 SvREFCNT_dec(kid->op_sv);
350de78d 6184#ifdef USE_ITHREADS
638eceb6 6185 /* XXX hack: dependence on sizeof(PADOP) <= sizeof(SVOP) */
350de78d 6186 kPADOP->op_padix = pad_alloc(OP_GV, SVs_PADTMP);
dd2155a4 6187 SvREFCNT_dec(PAD_SVl(kPADOP->op_padix));
743e66e6 6188 GvIN_PAD_on(gv);
b37c2d43 6189 PAD_SETSV(kPADOP->op_padix, (SV*) SvREFCNT_inc_simple_NN(gv));
350de78d 6190#else
b37c2d43 6191 kid->op_sv = SvREFCNT_inc_simple_NN(gv);
350de78d 6192#endif
23f1ca44 6193 kid->op_private = 0;
76cd736e 6194 kid->op_ppaddr = PL_ppaddr[OP_GV];
a0d0e21e 6195 }
79072805 6196 }
11343788 6197 return o;
79072805
LW		 6198}
6199
6200OP *
cea2e8a9 6201Perl_ck_ftst(pTHX_ OP *o)
79072805 6202{
27da23d5 6203 dVAR;
6867be6d 6204 const I32 type = o->op_type;
79072805 6205
d0dca557 6206 if (o->op_flags & OPf_REF) {
6f207bd3 6207 NOOP;
d0dca557
JD		 6208 }
6209 else if (o->op_flags & OPf_KIDS && cUNOPo->op_first->op_type != OP_STUB) {
551405c4 6210 SVOP * const kid = (SVOP*)cUNOPo->op_first;
1496a290 6211 const OPCODE kidtype = kid->op_type;
79072805 6212
1496a290 6213 if (kidtype == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
551405c4 6214 OP * const newop = newGVOP(type, OPf_REF,
f776e3cd 6215 gv_fetchsv(kid->op_sv, GV_ADD, SVt_PVIO));
eb8433b7
NC		 6216#ifdef PERL_MAD
6217 op_getmad(o,newop,'O');
6218#else
11343788 6219 op_free(o);
eb8433b7 6220#endif
1d866c12 6221 return newop;
79072805 6222 }
1d866c12 6223 if ((PL_hints & HINT_FILETEST_ACCESS) && OP_IS_FILETEST_ACCESS(o))
1af34c76 6224 o->op_private |= OPpFT_ACCESS;
1496a290
AL		 6225 if (PL_check[kidtype] == MEMBER_TO_FPTR(Perl_ck_ftst)
6226 && kidtype != OP_STAT && kidtype != OP_LSTAT)
fbb0b3b3 6227 o->op_private |= OPpFT_STACKED;
79072805
LW		 6228 }
6229 else {
eb8433b7 6230#ifdef PERL_MAD
1d866c12 6231 OP* const oldo = o;
eb8433b7 6232#else
11343788 6233 op_free(o);
eb8433b7 6234#endif
79072805 6235 if (type == OP_FTTTY)
8fde6460 6236 o = newGVOP(type, OPf_REF, PL_stdingv);
79072805 6237 else
d0dca557 6238 o = newUNOP(type, 0, newDEFSVOP());
eb8433b7 6239 op_getmad(oldo,o,'O');
79072805 6240 }
11343788 6241 return o;
79072805
LW		 6242}
6243
6244OP *
cea2e8a9 6245Perl_ck_fun(pTHX_ OP *o)
79072805 6246{
97aff369 6247 dVAR;
6867be6d 6248 const int type = o->op_type;
22c35a8c 6249 register I32 oa = PL_opargs[type] >> OASHIFT;
aeea060c 6250
11343788 6251 if (o->op_flags & OPf_STACKED) {
79072805
LW		 6252 if ((oa & OA_OPTIONAL) && (oa >> 4) && !((oa >> 4) & OA_OPTIONAL))
6253 oa &= ~OA_OPTIONAL;
6254 else
11343788 6255 return no_fh_allowed(o);
79072805
LW		 6256 }
6257
11343788 6258 if (o->op_flags & OPf_KIDS) {
6867be6d
AL		 6259 OP **tokid = &cLISTOPo->op_first;
6260 register OP *kid = cLISTOPo->op_first;
6261 OP *sibl;
6262 I32 numargs = 0;
6263
8990e307 6264 if (kid->op_type == OP_PUSHMARK ||
155aba94 6265 (kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK))
8990e307 6266 {
79072805
LW		 6267 tokid = &kid->op_sibling;
6268 kid = kid->op_sibling;
6269 }
22c35a8c 6270 if (!kid && PL_opargs[type] & OA_DEFGV)
54b9620d 6271 *tokid = kid = newDEFSVOP();
79072805
LW		 6272
6273 while (oa && kid) {
6274 numargs++;
6275 sibl = kid->op_sibling;
eb8433b7
NC		 6276#ifdef PERL_MAD
6277 if (!sibl && kid->op_type == OP_STUB) {
6278 numargs--;
6279 break;
6280 }
6281#endif
79072805
LW		 6282 switch (oa & 7) {
6283 case OA_SCALAR:
62c18ce2
GS		 6284 /* list seen where single (scalar) arg expected? */
6285 if (numargs == 1 && !(oa >> 4)
6286 && kid->op_type == OP_LIST && type != OP_SCALAR)
6287 {
6288 return too_many_arguments(o,PL_op_desc[type]);
6289 }
79072805
LW		 6290 scalar(kid);
6291 break;
6292 case OA_LIST:
6293 if (oa < 16) {
6294 kid = 0;
6295 continue;
6296 }
6297 else
6298 list(kid);
6299 break;
6300 case OA_AVREF:
936edb8b 6301 if ((type == OP_PUSH || type == OP_UNSHIFT)
f87c3213 6302 && !kid->op_sibling && ckWARN(WARN_SYNTAX))
9014280d 6303 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
de4864e4 6304 "Useless use of %s with no values",
936edb8b 6305 PL_op_desc[type]);
b2ffa427 6306
79072805 6307 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 6308 (kid->op_private & OPpCONST_BARE))
6309 {
551405c4 6310 OP * const newop = newAVREF(newGVOP(OP_GV, 0,
f776e3cd 6311 gv_fetchsv(((SVOP*)kid)->op_sv, GV_ADD, SVt_PVAV) ));
12bcd1a6
PM		 6312 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
6313 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
7a5fd60d 6314 "Array @%"SVf" missing the @ in argument %"IVdf" of %s()",
95b63a38 6315 (void*)((SVOP*)kid)->op_sv, (IV)numargs, PL_op_desc[type]);
eb8433b7
NC		 6316#ifdef PERL_MAD
6317 op_getmad(kid,newop,'K');
6318#else
79072805 6319 op_free(kid);
eb8433b7 6320#endif
79072805
LW		 6321 kid = newop;
6322 kid->op_sibling = sibl;
6323 *tokid = kid;
6324 }
8990e307 6325 else if (kid->op_type != OP_RV2AV && kid->op_type != OP_PADAV)
35cd451c 6326 bad_type(numargs, "array", PL_op_desc[type], kid);
a0d0e21e 6327 mod(kid, type);
79072805
LW		 6328 break;
6329 case OA_HVREF:
6330 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 6331 (kid->op_private & OPpCONST_BARE))
6332 {
551405c4 6333 OP * const newop = newHVREF(newGVOP(OP_GV, 0,
f776e3cd 6334 gv_fetchsv(((SVOP*)kid)->op_sv, GV_ADD, SVt_PVHV) ));
12bcd1a6
PM		 6335 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
6336 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
7a5fd60d 6337 "Hash %%%"SVf" missing the %% in argument %"IVdf" of %s()",
95b63a38 6338 (void*)((SVOP*)kid)->op_sv, (IV)numargs, PL_op_desc[type]);
eb8433b7
NC		 6339#ifdef PERL_MAD
6340 op_getmad(kid,newop,'K');
6341#else
79072805 6342 op_free(kid);
eb8433b7 6343#endif
79072805
LW		 6344 kid = newop;
6345 kid->op_sibling = sibl;
6346 *tokid = kid;
6347 }
8990e307 6348 else if (kid->op_type != OP_RV2HV && kid->op_type != OP_PADHV)
35cd451c 6349 bad_type(numargs, "hash", PL_op_desc[type], kid);
a0d0e21e 6350 mod(kid, type);
79072805
LW		 6351 break;
6352 case OA_CVREF:
6353 {
551405c4 6354 OP * const newop = newUNOP(OP_NULL, 0, kid);
79072805
LW		 6355 kid->op_sibling = 0;
6356 linklist(kid);
6357 newop->op_next = newop;
6358 kid = newop;
6359 kid->op_sibling = sibl;
6360 *tokid = kid;
6361 }
6362 break;
6363 case OA_FILEREF:
c340be78 6364 if (kid->op_type != OP_GV && kid->op_type != OP_RV2GV) {
79072805 6365 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 6366 (kid->op_private & OPpCONST_BARE))
6367 {
0bd48802 6368 OP * const newop = newGVOP(OP_GV, 0,
f776e3cd 6369 gv_fetchsv(((SVOP*)kid)->op_sv, GV_ADD, SVt_PVIO));
afbdacea 6370 if (!(o->op_private & 1) && /* if not unop */
8a996ce8 6371 kid == cLISTOPo->op_last)
364daeac 6372 cLISTOPo->op_last = newop;
eb8433b7
NC		 6373#ifdef PERL_MAD
6374 op_getmad(kid,newop,'K');
6375#else
79072805 6376 op_free(kid);
eb8433b7 6377#endif
79072805
LW		 6378 kid = newop;
6379 }
1ea32a52
GS		 6380 else if (kid->op_type == OP_READLINE) {
6381 /* neophyte patrol: open(<FH>), close(<FH>) etc. */
53e06cf0 6382 bad_type(numargs, "HANDLE", OP_DESC(o), kid);
1ea32a52 6383 }
79072805 6384 else {
35cd451c 6385 I32 flags = OPf_SPECIAL;
a6c40364 6386 I32 priv = 0;
2c8ac474
GS		 6387 PADOFFSET targ = 0;
6388
35cd451c 6389 /* is this op a FH constructor? */
853846ea 6390 if (is_handle_constructor(o,numargs)) {
bd61b366 6391 const char *name = NULL;
dd2155a4 6392 STRLEN len = 0;
2c8ac474
GS		 6393
6394 flags = 0;
6395 /* Set a flag to tell rv2gv to vivify
853846ea
NIS		 6396 * need to "prove" flag does not mean something
6397 * else already - NI-S 1999/05/07
2c8ac474
GS		 6398 */
6399 priv = OPpDEREF;
6400 if (kid->op_type == OP_PADSV) {
dd2155a4
DM		 6401 name = PAD_COMPNAME_PV(kid->op_targ);
6402 /* SvCUR of a pad namesv can't be trusted
6403 * (see PL_generation), so calc its length
6404 * manually */
6405 if (name)
6406 len = strlen(name);
6407
2c8ac474
GS		 6408 }
6409 else if (kid->op_type == OP_RV2SV
6410 && kUNOP->op_first->op_type == OP_GV)
6411 {
0bd48802 6412 GV * const gv = cGVOPx_gv(kUNOP->op_first);
2c8ac474
GS		 6413 name = GvNAME(gv);
6414 len = GvNAMELEN(gv);
6415 }
afd1915d
GS		 6416 else if (kid->op_type == OP_AELEM
6417 || kid->op_type == OP_HELEM)
6418 {
735fec84 6419 OP *firstop;
551405c4 6420 OP *op = ((BINOP*)kid)->op_first;
a4fc7abc 6421 name = NULL;
551405c4 6422 if (op) {
a0714e2c 6423 SV *tmpstr = NULL;
551405c4 6424 const char * const a =
0c4b0a3f
JH		 6425 kid->op_type == OP_AELEM ?
6426 "[]" : "{}";
6427 if (((op->op_type == OP_RV2AV) ||
6428 (op->op_type == OP_RV2HV)) &&
735fec84
RGS		 6429 (firstop = ((UNOP*)op)->op_first) &&
6430 (firstop->op_type == OP_GV)) {
0c4b0a3f 6431 /* packagevar $a[] or $h{} */
735fec84 6432 GV * const gv = cGVOPx_gv(firstop);
0c4b0a3f
JH		 6433 if (gv)
6434 tmpstr =
6435 Perl_newSVpvf(aTHX_
6436 "%s%c...%c",
6437 GvNAME(gv),
6438 a[0], a[1]);
6439 }
6440 else if (op->op_type == OP_PADAV
6441 || op->op_type == OP_PADHV) {
6442 /* lexicalvar $a[] or $h{} */
551405c4 6443 const char * const padname =
0c4b0a3f
JH		 6444 PAD_COMPNAME_PV(op->op_targ);
6445 if (padname)
6446 tmpstr =
6447 Perl_newSVpvf(aTHX_
6448 "%s%c...%c",
6449 padname + 1,
6450 a[0], a[1]);
0c4b0a3f
JH		 6451 }
6452 if (tmpstr) {
93524f2b 6453 name = SvPV_const(tmpstr, len);
0c4b0a3f
JH		 6454 sv_2mortal(tmpstr);
6455 }
6456 }
6457 if (!name) {
6458 name = "__ANONIO__";
6459 len = 10;
6460 }
6461 mod(kid, type);
afd1915d 6462 }
2c8ac474
GS		 6463 if (name) {
6464 SV *namesv;
6465 targ = pad_alloc(OP_RV2GV, SVs_PADTMP);
dd2155a4 6466 namesv = PAD_SVl(targ);
862a34c6 6467 SvUPGRADE(namesv, SVt_PV);
2c8ac474
GS		 6468 if (*name != '$')
6469 sv_setpvn(namesv, "$", 1);
6470 sv_catpvn(namesv, name, len);
6471 }
853846ea 6472 }
79072805 6473 kid->op_sibling = 0;
35cd451c 6474 kid = newUNOP(OP_RV2GV, flags, scalar(kid));
2c8ac474
GS		 6475 kid->op_targ = targ;
6476 kid->op_private |= priv;
79072805
LW		 6477 }
6478 kid->op_sibling = sibl;
6479 *tokid = kid;
6480 }
6481 scalar(kid);
6482 break;
6483 case OA_SCALARREF:
a0d0e21e 6484 mod(scalar(kid), type);
79072805
LW		 6485 break;
6486 }
6487 oa >>= 4;
6488 tokid = &kid->op_sibling;
6489 kid = kid->op_sibling;
6490 }
eb8433b7
NC		 6491#ifdef PERL_MAD
6492 if (kid && kid->op_type != OP_STUB)
6493 return too_many_arguments(o,OP_DESC(o));
6494 o->op_private |= numargs;
6495#else
6496 /* FIXME - should the numargs move as for the PERL_MAD case? */
11343788 6497 o->op_private |= numargs;
79072805 6498 if (kid)
53e06cf0 6499 return too_many_arguments(o,OP_DESC(o));
eb8433b7 6500#endif
11343788 6501 listkids(o);
79072805 6502 }
22c35a8c 6503 else if (PL_opargs[type] & OA_DEFGV) {
c56915e3 6504#ifdef PERL_MAD
c7fe699d 6505 OP *newop = newUNOP(type, 0, newDEFSVOP());
c56915e3 6506 op_getmad(o,newop,'O');
c7fe699d 6507 return newop;
c56915e3 6508#else
c7fe699d 6509 /* Ordering of these two is important to keep f_map.t passing. */
11343788 6510 op_free(o);
c7fe699d 6511 return newUNOP(type, 0, newDEFSVOP());
c56915e3 6512#endif
a0d0e21e
LW		 6513 }
6514
79072805
LW		 6515 if (oa) {
6516 while (oa & OA_OPTIONAL)
6517 oa >>= 4;
6518 if (oa && oa != OA_LIST)
53e06cf0 6519 return too_few_arguments(o,OP_DESC(o));
79072805 6520 }
11343788 6521 return o;
79072805
LW		 6522}
6523
6524OP *
cea2e8a9 6525Perl_ck_glob(pTHX_ OP *o)
79072805 6526{
27da23d5 6527 dVAR;
fb73857a 6528 GV *gv;
6529
649da076 6530 o = ck_fun(o);
1f2bfc8a 6531 if ((o->op_flags & OPf_KIDS) && !cLISTOPo->op_first->op_sibling)
54b9620d 6532 append_elem(OP_GLOB, o, newDEFSVOP());
fb73857a 6533
fafc274c 6534 if (!((gv = gv_fetchpvs("glob", GV_NOTQUAL, SVt_PVCV))
b9f751c0
GS		 6535 && GvCVu(gv) && GvIMPORTED_CV(gv)))
6536 {
5c1737d1 6537 gv = gv_fetchpvs("CORE::GLOBAL::glob", 0, SVt_PVCV);
b9f751c0 6538 }
b1cb66bf 6539
52bb0670 6540#if !defined(PERL_EXTERNAL_GLOB)
72b16652 6541 /* XXX this can be tightened up and made more failsafe. */
f444d496 6542 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv))) {
7d3fb230 6543 GV *glob_gv;
72b16652 6544 ENTER;
00ca71c1 6545 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
a0714e2c 6546 newSVpvs("File::Glob"), NULL, NULL, NULL);
5c1737d1
NC		 6547 gv = gv_fetchpvs("CORE::GLOBAL::glob", 0, SVt_PVCV);
6548 glob_gv = gv_fetchpvs("File::Glob::csh_glob", 0, SVt_PVCV);
7d3fb230 6549 GvCV(gv) = GvCV(glob_gv);
b37c2d43 6550 SvREFCNT_inc_void((SV*)GvCV(gv));
7d3fb230 6551 GvIMPORTED_CV_on(gv);
72b16652
GS		 6552 LEAVE;
6553 }
52bb0670 6554#endif /* PERL_EXTERNAL_GLOB */
72b16652 6555
b9f751c0 6556 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
5196be3e 6557 append_elem(OP_GLOB, o,
80252599 6558 newSVOP(OP_CONST, 0, newSViv(PL_glob_index++)));
1f2bfc8a 6559 o->op_type = OP_LIST;
22c35a8c 6560 o->op_ppaddr = PL_ppaddr[OP_LIST];
1f2bfc8a 6561 cLISTOPo->op_first->op_type = OP_PUSHMARK;
22c35a8c 6562 cLISTOPo->op_first->op_ppaddr = PL_ppaddr[OP_PUSHMARK];
ad33f57d 6563 cLISTOPo->op_first->op_targ = 0;
1f2bfc8a 6564 o = newUNOP(OP_ENTERSUB, OPf_STACKED,
aeea060c 6565 append_elem(OP_LIST, o,
1f2bfc8a
MB		 6566 scalar(newUNOP(OP_RV2CV, 0,
6567 newGVOP(OP_GV, 0, gv)))));
d58bf5aa
MB		 6568 o = newUNOP(OP_NULL, 0, ck_subr(o));
6569 o->op_targ = OP_GLOB; /* hint at what it used to be */
6570 return o;
b1cb66bf 6571 }
6572 gv = newGVgen("main");
a0d0e21e 6573 gv_IOadd(gv);
11343788
MB		 6574 append_elem(OP_GLOB, o, newGVOP(OP_GV, 0, gv));
6575 scalarkids(o);
649da076 6576 return o;
79072805
LW		 6577}
6578
6579OP *
cea2e8a9 6580Perl_ck_grep(pTHX_ OP *o)
79072805 6581{
27da23d5 6582 dVAR;
03ca120d 6583 LOGOP *gwop = NULL;
79072805 6584 OP *kid;
6867be6d 6585 const OPCODE type = o->op_type == OP_GREPSTART ? OP_GREPWHILE : OP_MAPWHILE;
9f7d9405 6586 PADOFFSET offset;
79072805 6587
22c35a8c 6588 o->op_ppaddr = PL_ppaddr[OP_GREPSTART];
03ca120d 6589 /* don't allocate gwop here, as we may leak it if PL_error_count > 0 */
aeea060c 6590
11343788 6591 if (o->op_flags & OPf_STACKED) {
a0d0e21e 6592 OP* k;
11343788
MB		 6593 o = ck_sort(o);
6594 kid = cLISTOPo->op_first->op_sibling;
d09ad856
BS		 6595 if (!cUNOPx(kid)->op_next)
6596 Perl_croak(aTHX_ "panic: ck_grep");
e3c9a8b9 6597 for (k = cUNOPx(kid)->op_first; k; k = k->op_next) {
a0d0e21e
LW		 6598 kid = k;
6599 }
03ca120d 6600 NewOp(1101, gwop, 1, LOGOP);
a0d0e21e 6601 kid->op_next = (OP*)gwop;
11343788 6602 o->op_flags &= ~OPf_STACKED;
93a17b20 6603 }
11343788 6604 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e
LW		 6605 if (type == OP_MAPWHILE)
6606 list(kid);
6607 else
6608 scalar(kid);
11343788 6609 o = ck_fun(o);
3280af22 6610 if (PL_error_count)
11343788 6611 return o;
aeea060c 6612 kid = cLISTOPo->op_first->op_sibling;
79072805 6613 if (kid->op_type != OP_NULL)
cea2e8a9 6614 Perl_croak(aTHX_ "panic: ck_grep");
79072805
LW		 6615 kid = kUNOP->op_first;
6616
03ca120d
MHM		 6617 if (!gwop)
6618 NewOp(1101, gwop, 1, LOGOP);
a0d0e21e 6619 gwop->op_type = type;
22c35a8c 6620 gwop->op_ppaddr = PL_ppaddr[type];
11343788 6621 gwop->op_first = listkids(o);
79072805 6622 gwop->op_flags |= OPf_KIDS;
79072805 6623 gwop->op_other = LINKLIST(kid);
79072805 6624 kid->op_next = (OP*)gwop;
59f00321 6625 offset = pad_findmy("$_");
00b1698f 6626 if (offset == NOT_IN_PAD || PAD_COMPNAME_FLAGS_isOUR(offset)) {
59f00321
RGS		 6627 o->op_private = gwop->op_private = 0;
6628 gwop->op_targ = pad_alloc(type, SVs_PADTMP);
6629 }
6630 else {
6631 o->op_private = gwop->op_private = OPpGREP_LEX;
6632 gwop->op_targ = o->op_targ = offset;
6633 }
79072805 6634
11343788 6635 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e 6636 if (!kid || !kid->op_sibling)
53e06cf0 6637 return too_few_arguments(o,OP_DESC(o));
a0d0e21e
LW		 6638 for (kid = kid->op_sibling; kid; kid = kid->op_sibling)
6639 mod(kid, OP_GREPSTART);
6640
79072805
LW		 6641 return (OP*)gwop;
6642}
6643
6644OP *
cea2e8a9 6645Perl_ck_index(pTHX_ OP *o)
79072805 6646{
11343788
MB		 6647 if (o->op_flags & OPf_KIDS) {
6648 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
0b71040e
LW		 6649 if (kid)
6650 kid = kid->op_sibling; /* get past "big" */
79072805 6651 if (kid && kid->op_type == OP_CONST)
2779dcf1 6652 fbm_compile(((SVOP*)kid)->op_sv, 0);
79072805 6653 }
11343788 6654 return ck_fun(o);
79072805
LW		 6655}
6656
6657OP *
cea2e8a9 6658Perl_ck_lengthconst(pTHX_ OP *o)
79072805
LW		 6659{
6660 /* XXX length optimization goes here */
11343788 6661 return ck_fun(o);
79072805
LW		 6662}
6663
6664OP *
cea2e8a9 6665Perl_ck_lfun(pTHX_ OP *o)
79072805 6666{
6867be6d 6667 const OPCODE type = o->op_type;
5dc0d613 6668 return modkids(ck_fun(o), type);
79072805
LW		 6669}
6670
6671OP *
cea2e8a9 6672Perl_ck_defined(pTHX_ OP *o) /* 19990527 MJD */
69794302 6673{
12bcd1a6 6674 if ((o->op_flags & OPf_KIDS) && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)) {
d0334bed
GS		 6675 switch (cUNOPo->op_first->op_type) {
6676 case OP_RV2AV:
a8739d98
JH		 6677 /* This is needed for
6678 if (defined %stash::)
6679 to work. Do not break Tk.
6680 */
1c846c1f 6681 break; /* Globals via GV can be undef */
d0334bed
GS		 6682 case OP_PADAV:
6683 case OP_AASSIGN: /* Is this a good idea? */
12bcd1a6 6684 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
f10b0346 6685 "defined(@array) is deprecated");
12bcd1a6 6686 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
cc507455 6687 "\t(Maybe you should just omit the defined()?)\n");
69794302 6688 break;
d0334bed 6689 case OP_RV2HV:
a8739d98
JH		 6690 /* This is needed for
6691 if (defined %stash::)
6692 to work. Do not break Tk.
6693 */
1c846c1f 6694 break; /* Globals via GV can be undef */
d0334bed 6695 case OP_PADHV:
12bcd1a6 6696 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
894356b3 6697 "defined(%%hash) is deprecated");
12bcd1a6 6698 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
cc507455 6699 "\t(Maybe you should just omit the defined()?)\n");
d0334bed
GS		 6700 break;
6701 default:
6702 /* no warning */
6703 break;
6704 }
69794302
MJD		 6705 }
6706 return ck_rfun(o);
6707}
6708
6709OP *
cea2e8a9 6710Perl_ck_rfun(pTHX_ OP *o)
8990e307 6711{
6867be6d 6712 const OPCODE type = o->op_type;
5dc0d613 6713 return refkids(ck_fun(o), type);
8990e307
LW		 6714}
6715
6716OP *
cea2e8a9 6717Perl_ck_listiob(pTHX_ OP *o)
79072805
LW		 6718{
6719 register OP *kid;
aeea060c 6720
11343788 6721 kid = cLISTOPo->op_first;
79072805 6722 if (!kid) {
11343788
MB		 6723 o = force_list(o);
6724 kid = cLISTOPo->op_first;
79072805
LW		 6725 }
6726 if (kid->op_type == OP_PUSHMARK)
6727 kid = kid->op_sibling;
11343788 6728 if (kid && o->op_flags & OPf_STACKED)
79072805
LW		 6729 kid = kid->op_sibling;
6730 else if (kid && !kid->op_sibling) { /* print HANDLE; */
6731 if (kid->op_type == OP_CONST && kid->op_private & OPpCONST_BARE) {
11343788 6732 o->op_flags |= OPf_STACKED; /* make it a filehandle */
748a9306 6733 kid = newUNOP(OP_RV2GV, OPf_REF, scalar(kid));
11343788
MB		 6734 cLISTOPo->op_first->op_sibling = kid;
6735 cLISTOPo->op_last = kid;
79072805
LW		 6736 kid = kid->op_sibling;
6737 }
6738 }
b2ffa427 6739
79072805 6740 if (!kid)
54b9620d 6741 append_elem(o->op_type, o, newDEFSVOP());
79072805 6742
2de3dbcc 6743 return listkids(o);
bbce6d69 6744}
6745
6746OP *
0d863452
RH		 6747Perl_ck_say(pTHX_ OP *o)
6748{
6749 o = ck_listiob(o);
6750 o->op_type = OP_PRINT;
6751 cLISTOPo->op_last = cLISTOPo->op_last->op_sibling
396482e1 6752 = newSVOP(OP_CONST, 0, newSVpvs("\n"));
0d863452
RH		 6753 return o;
6754}
6755
6756OP *
6757Perl_ck_smartmatch(pTHX_ OP *o)
6758{
97aff369 6759 dVAR;
0d863452
RH		 6760 if (0 == (o->op_flags & OPf_SPECIAL)) {
6761 OP *first = cBINOPo->op_first;
6762 OP *second = first->op_sibling;
6763
6764 /* Implicitly take a reference to an array or hash */
5f66b61c 6765 first->op_sibling = NULL;
0d863452
RH		 6766 first = cBINOPo->op_first = ref_array_or_hash(first);
6767 second = first->op_sibling = ref_array_or_hash(second);
6768
6769 /* Implicitly take a reference to a regular expression */
6770 if (first->op_type == OP_MATCH) {
6771 first->op_type = OP_QR;
6772 first->op_ppaddr = PL_ppaddr[OP_QR];
6773 }
6774 if (second->op_type == OP_MATCH) {
6775 second->op_type = OP_QR;
6776 second->op_ppaddr = PL_ppaddr[OP_QR];
6777 }
6778 }
6779
6780 return o;
6781}
6782
6783
6784OP *
b162f9ea
IZ		 6785Perl_ck_sassign(pTHX_ OP *o)
6786{
1496a290 6787 OP * const kid = cLISTOPo->op_first;
b162f9ea
IZ		 6788 /* has a disposable target? */
6789 if ((PL_opargs[kid->op_type] & OA_TARGLEX)
6b66af17
GS		 6790 && !(kid->op_flags & OPf_STACKED)
6791 /* Cannot steal the second time! */
6792 && !(kid->op_private & OPpTARGET_MY))
b162f9ea 6793 {
551405c4 6794 OP * const kkid = kid->op_sibling;
b162f9ea
IZ		 6795
6796 /* Can just relocate the target. */
2c2d71f5
JH		 6797 if (kkid && kkid->op_type == OP_PADSV
6798 && !(kkid->op_private & OPpLVAL_INTRO))
6799 {
b162f9ea 6800 kid->op_targ = kkid->op_targ;
743e66e6 6801 kkid->op_targ = 0;
b162f9ea
IZ		 6802 /* Now we do not need PADSV and SASSIGN. */
6803 kid->op_sibling = o->op_sibling; /* NULL */
6804 cLISTOPo->op_first = NULL;
eb8433b7
NC		 6805#ifdef PERL_MAD
6806 op_getmad(o,kid,'O');
6807 op_getmad(kkid,kid,'M');
6808#else
b162f9ea
IZ		 6809 op_free(o);
6810 op_free(kkid);
eb8433b7 6811#endif
b162f9ea
IZ		 6812 kid->op_private |= OPpTARGET_MY; /* Used for context settings */
6813 return kid;
6814 }
6815 }
952306ac
RGS		 6816 if (kid->op_sibling) {
6817 OP *kkid = kid->op_sibling;
6818 if (kkid->op_type == OP_PADSV
6819 && (kkid->op_private & OPpLVAL_INTRO)
6820 && SvPAD_STATE(*av_fetch(PL_comppad_name, kkid->op_targ, FALSE))) {
6821 o->op_private |= OPpASSIGN_STATE;
6822 /* hijacking PADSTALE for uninitialized state variables */
6823 SvPADSTALE_on(PAD_SVl(kkid->op_targ));
6824 }
6825 }
b162f9ea
IZ		 6826 return o;
6827}
6828
6829OP *
cea2e8a9 6830Perl_ck_match(pTHX_ OP *o)
79072805 6831{
97aff369 6832 dVAR;
0d863452 6833 if (o->op_type != OP_QR && PL_compcv) {
9f7d9405 6834 const PADOFFSET offset = pad_findmy("$_");
00b1698f 6835 if (offset != NOT_IN_PAD && !(PAD_COMPNAME_FLAGS_isOUR(offset))) {
59f00321
RGS		 6836 o->op_targ = offset;
6837 o->op_private |= OPpTARGET_MY;
6838 }
6839 }
6840 if (o->op_type == OP_MATCH || o->op_type == OP_QR)
6841 o->op_private |= OPpRUNTIME;
11343788 6842 return o;
79072805
LW		 6843}
6844
6845OP *
f5d5a27c
CS		 6846Perl_ck_method(pTHX_ OP *o)
6847{
551405c4 6848 OP * const kid = cUNOPo->op_first;
f5d5a27c
CS		 6849 if (kid->op_type == OP_CONST) {
6850 SV* sv = kSVOP->op_sv;
a4fc7abc
AL		 6851 const char * const method = SvPVX_const(sv);
6852 if (!(strchr(method, ':') || strchr(method, '\''))) {
f5d5a27c 6853 OP *cmop;
1c846c1f 6854 if (!SvREADONLY(sv) || !SvFAKE(sv)) {
a4fc7abc 6855 sv = newSVpvn_share(method, SvCUR(sv), 0);
1c846c1f
NIS		 6856 }
6857 else {
a0714e2c 6858 kSVOP->op_sv = NULL;
1c846c1f 6859 }
f5d5a27c 6860 cmop = newSVOP(OP_METHOD_NAMED, 0, sv);
eb8433b7
NC		 6861#ifdef PERL_MAD
6862 op_getmad(o,cmop,'O');
6863#else
f5d5a27c 6864 op_free(o);
eb8433b7 6865#endif
f5d5a27c
CS		 6866 return cmop;
6867 }
6868 }
6869 return o;
6870}
6871
6872OP *
cea2e8a9 6873Perl_ck_null(pTHX_ OP *o)
79072805 6874{
96a5add6 6875 PERL_UNUSED_CONTEXT;
11343788 6876 return o;
79072805
LW		 6877}
6878
6879OP *
16fe6d59
GS		 6880Perl_ck_open(pTHX_ OP *o)
6881{
97aff369 6882 dVAR;
551405c4 6883 HV * const table = GvHV(PL_hintgv);
16fe6d59 6884 if (table) {
a4fc7abc 6885 SV **svp = hv_fetchs(table, "open_IN", FALSE);
16fe6d59 6886 if (svp && *svp) {
551405c4 6887 const I32 mode = mode_from_discipline(*svp);
16fe6d59
GS		 6888 if (mode & O_BINARY)
6889 o->op_private |= OPpOPEN_IN_RAW;
6890 else if (mode & O_TEXT)
6891 o->op_private |= OPpOPEN_IN_CRLF;
6892 }
6893
a4fc7abc 6894 svp = hv_fetchs(table, "open_OUT", FALSE);
16fe6d59 6895 if (svp && *svp) {
551405c4 6896 const I32 mode = mode_from_discipline(*svp);
16fe6d59
GS		 6897 if (mode & O_BINARY)
6898 o->op_private |= OPpOPEN_OUT_RAW;
6899 else if (mode & O_TEXT)
6900 o->op_private |= OPpOPEN_OUT_CRLF;
6901 }
6902 }
6903 if (o->op_type == OP_BACKTICK)
6904 return o;
3b82e551
JH		 6905 {
6906 /* In case of three-arg dup open remove strictness
6907 * from the last arg if it is a bareword. */
551405c4
AL		 6908 OP * const first = cLISTOPx(o)->op_first; /* The pushmark. */
6909 OP * const last = cLISTOPx(o)->op_last; /* The bareword. */
3b82e551 6910 OP *oa;
b15aece3 6911 const char *mode;
3b82e551
JH		 6912
6913 if ((last->op_type == OP_CONST) && /* The bareword. */
6914 (last->op_private & OPpCONST_BARE) &&
6915 (last->op_private & OPpCONST_STRICT) &&
6916 (oa = first->op_sibling) && /* The fh. */
6917 (oa = oa->op_sibling) && /* The mode. */
ea1d064a 6918 (oa->op_type == OP_CONST) &&
3b82e551 6919 SvPOK(((SVOP*)oa)->op_sv) &&
b15aece3 6920 (mode = SvPVX_const(((SVOP*)oa)->op_sv)) &&
3b82e551
JH		 6921 mode[0] == '>' && mode[1] == '&' && /* A dup open. */
6922 (last == oa->op_sibling)) /* The bareword. */
6923 last->op_private &= ~OPpCONST_STRICT;
6924 }
16fe6d59
GS		 6925 return ck_fun(o);
6926}
6927
6928OP *
cea2e8a9 6929Perl_ck_repeat(pTHX_ OP *o)
79072805 6930{
11343788
MB		 6931 if (cBINOPo->op_first->op_flags & OPf_PARENS) {
6932 o->op_private |= OPpREPEAT_DOLIST;
6933 cBINOPo->op_first = force_list(cBINOPo->op_first);
79072805
LW		 6934 }
6935 else
11343788
MB		 6936 scalar(o);
6937 return o;
79072805
LW		 6938}
6939
6940OP *
cea2e8a9 6941Perl_ck_require(pTHX_ OP *o)
8990e307 6942{
97aff369 6943 dVAR;
a0714e2c 6944 GV* gv = NULL;
ec4ab249 6945
11343788 6946 if (o->op_flags & OPf_KIDS) { /* Shall we supply missing .pm? */
551405c4 6947 SVOP * const kid = (SVOP*)cUNOPo->op_first;
8990e307
LW		 6948
6949 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
551405c4 6950 SV * const sv = kid->op_sv;
5c144d81 6951 U32 was_readonly = SvREADONLY(sv);
8990e307 6952 char *s;
5c144d81
NC		 6953
6954 if (was_readonly) {
6955 if (SvFAKE(sv)) {
6956 sv_force_normal_flags(sv, 0);
6957 assert(!SvREADONLY(sv));
6958 was_readonly = 0;
6959 } else {
6960 SvREADONLY_off(sv);
6961 }
6962 }
6963
6964 for (s = SvPVX(sv); *s; s++) {
a0d0e21e 6965 if (*s == ':' && s[1] == ':') {
42d9b98d 6966 const STRLEN len = strlen(s+2)+1;
a0d0e21e 6967 *s = '/';
42d9b98d 6968 Move(s+2, s+1, len, char);
5c144d81 6969 SvCUR_set(sv, SvCUR(sv) - 1);
a0d0e21e 6970 }
8990e307 6971 }
396482e1 6972 sv_catpvs(sv, ".pm");
5c144d81 6973 SvFLAGS(sv) |= was_readonly;
8990e307
LW		 6974 }
6975 }
ec4ab249 6976
a72a1c8b
RGS		 6977 if (!(o->op_flags & OPf_SPECIAL)) { /* Wasn't written as CORE::require */
6978 /* handle override, if any */
fafc274c 6979 gv = gv_fetchpvs("require", GV_NOTQUAL, SVt_PVCV);
d6a985f2 6980 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv))) {
a4fc7abc 6981 GV * const * const gvp = (GV**)hv_fetchs(PL_globalstash, "require", FALSE);
a0714e2c 6982 gv = gvp ? *gvp : NULL;
d6a985f2 6983 }
a72a1c8b 6984 }
ec4ab249 6985
b9f751c0 6986 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
551405c4 6987 OP * const kid = cUNOPo->op_first;
f11453cb
NC		 6988 OP * newop;
6989
ec4ab249 6990 cUNOPo->op_first = 0;
f11453cb 6991#ifndef PERL_MAD
ec4ab249 6992 op_free(o);
eb8433b7 6993#endif
f11453cb
NC		 6994 newop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
6995 append_elem(OP_LIST, kid,
6996 scalar(newUNOP(OP_RV2CV, 0,
6997 newGVOP(OP_GV, 0,
6998 gv))))));
6999 op_getmad(o,newop,'O');
eb8433b7 7000 return newop;
ec4ab249
GA		 7001 }
7002
11343788 7003 return ck_fun(o);
8990e307
LW		 7004}
7005
78f9721b
SM		 7006OP *
7007Perl_ck_return(pTHX_ OP *o)
7008{
97aff369 7009 dVAR;
78f9721b 7010 if (CvLVALUE(PL_compcv)) {
6867be6d 7011 OP *kid;
78f9721b
SM		 7012 for (kid = cLISTOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
7013 mod(kid, OP_LEAVESUBLV);
7014 }
7015 return o;
7016}
7017
79072805 7018OP *
cea2e8a9 7019Perl_ck_select(pTHX_ OP *o)
79072805 7020{
27da23d5 7021 dVAR;
c07a80fd 7022 OP* kid;
11343788
MB		 7023 if (o->op_flags & OPf_KIDS) {
7024 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
2304df62 7025 if (kid && kid->op_sibling) {
11343788 7026 o->op_type = OP_SSELECT;
22c35a8c 7027 o->op_ppaddr = PL_ppaddr[OP_SSELECT];
11343788
MB		 7028 o = ck_fun(o);
7029 return fold_constants(o);
79072805
LW		 7030 }
7031 }
11343788
MB		 7032 o = ck_fun(o);
7033 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
c07a80fd 7034 if (kid && kid->op_type == OP_RV2GV)
7035 kid->op_private &= ~HINT_STRICT_REFS;
11343788 7036 return o;
79072805
LW		 7037}
7038
7039OP *
cea2e8a9 7040Perl_ck_shift(pTHX_ OP *o)
79072805 7041{
97aff369 7042 dVAR;
6867be6d 7043 const I32 type = o->op_type;
79072805 7044
11343788 7045 if (!(o->op_flags & OPf_KIDS)) {
6d4ff0d2 7046 OP *argop;
eb8433b7
NC		 7047 /* FIXME - this can be refactored to reduce code in #ifdefs */
7048#ifdef PERL_MAD
1d866c12 7049 OP * const oldo = o;
eb8433b7 7050#else
11343788 7051 op_free(o);
eb8433b7 7052#endif
6d4ff0d2 7053 argop = newUNOP(OP_RV2AV, 0,
8fde6460 7054 scalar(newGVOP(OP_GV, 0, CvUNIQUE(PL_compcv) ? PL_argvgv : PL_defgv)));
eb8433b7
NC		 7055#ifdef PERL_MAD
7056 o = newUNOP(type, 0, scalar(argop));
7057 op_getmad(oldo,o,'O');
7058 return o;
7059#else
6d4ff0d2 7060 return newUNOP(type, 0, scalar(argop));
eb8433b7 7061#endif
79072805 7062 }
11343788 7063 return scalar(modkids(ck_fun(o), type));
79072805
LW		 7064}
7065
7066OP *
cea2e8a9 7067Perl_ck_sort(pTHX_ OP *o)
79072805 7068{
97aff369 7069 dVAR;
8e3f9bdf 7070 OP *firstkid;
bbce6d69 7071
1496a290 7072 if (o->op_type == OP_SORT && (PL_hints & HINT_LOCALIZE_HH) != 0) {
a4fc7abc 7073 HV * const hinthv = GvHV(PL_hintgv);
7b9ef140 7074 if (hinthv) {
a4fc7abc 7075 SV ** const svp = hv_fetchs(hinthv, "sort", FALSE);
7b9ef140 7076 if (svp) {
a4fc7abc 7077 const I32 sorthints = (I32)SvIV(*svp);
7b9ef140
RH		 7078 if ((sorthints & HINT_SORT_QUICKSORT) != 0)
7079 o->op_private |= OPpSORT_QSORT;
7080 if ((sorthints & HINT_SORT_STABLE) != 0)
7081 o->op_private |= OPpSORT_STABLE;
7082 }
7083 }
7084 }
7085
9ea6e965 7086 if (o->op_type == OP_SORT && o->op_flags & OPf_STACKED)
51a19bc0 7087 simplify_sort(o);
8e3f9bdf
GS		 7088 firstkid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
7089 if (o->op_flags & OPf_STACKED) { /* may have been cleared */
9c5ffd7c 7090 OP *k = NULL;
8e3f9bdf 7091 OP *kid = cUNOPx(firstkid)->op_first; /* get past null */
79072805 7092
463ee0b2 7093 if (kid->op_type == OP_SCOPE || kid->op_type == OP_LEAVE) {
79072805 7094 linklist(kid);
463ee0b2
LW		 7095 if (kid->op_type == OP_SCOPE) {
7096 k = kid->op_next;
7097 kid->op_next = 0;
79072805 7098 }
463ee0b2 7099 else if (kid->op_type == OP_LEAVE) {
11343788 7100 if (o->op_type == OP_SORT) {
93c66552 7101 op_null(kid); /* wipe out leave */
748a9306 7102 kid->op_next = kid;
463ee0b2 7103
748a9306
LW		 7104 for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
7105 if (k->op_next == kid)
7106 k->op_next = 0;
71a29c3c
GS		 7107 /* don't descend into loops */
7108 else if (k->op_type == OP_ENTERLOOP
7109 || k->op_type == OP_ENTERITER)
7110 {
7111 k = cLOOPx(k)->op_lastop;
7112 }
748a9306 7113 }
463ee0b2 7114 }
748a9306
LW		 7115 else
7116 kid->op_next = 0; /* just disconnect the leave */
a0d0e21e 7117 k = kLISTOP->op_first;
463ee0b2 7118 }
a2efc822 7119 CALL_PEEP(k);
a0d0e21e 7120
8e3f9bdf
GS		 7121 kid = firstkid;
7122 if (o->op_type == OP_SORT) {
7123 /* provide scalar context for comparison function/block */
7124 kid = scalar(kid);
a0d0e21e 7125 kid->op_next = kid;
8e3f9bdf 7126 }
a0d0e21e
LW		 7127 else
7128 kid->op_next = k;
11343788 7129 o->op_flags |= OPf_SPECIAL;
79072805 7130 }
c6e96bcb 7131 else if (kid->op_type == OP_RV2SV || kid->op_type == OP_PADSV)
93c66552 7132 op_null(firstkid);
8e3f9bdf
GS		 7133
7134 firstkid = firstkid->op_sibling;
79072805 7135 }
bbce6d69 7136
8e3f9bdf
GS		 7137 /* provide list context for arguments */
7138 if (o->op_type == OP_SORT)
7139 list(firstkid);
7140
11343788 7141 return o;
79072805 7142}
bda4119b
GS		 7143
7144STATIC void
cea2e8a9 7145S_simplify_sort(pTHX_ OP *o)
9c007264 7146{
97aff369 7147 dVAR;
9c007264
JH		 7148 register OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
7149 OP *k;
eb209983 7150 int descending;
350de78d 7151 GV *gv;
770526c1 7152 const char *gvname;
9c007264
JH		 7153 if (!(o->op_flags & OPf_STACKED))
7154 return;
fafc274c
NC		 7155 GvMULTI_on(gv_fetchpvs("a", GV_ADD|GV_NOTQUAL, SVt_PV));
7156 GvMULTI_on(gv_fetchpvs("b", GV_ADD|GV_NOTQUAL, SVt_PV));
82092f1d 7157 kid = kUNOP->op_first; /* get past null */
9c007264
JH		 7158 if (kid->op_type != OP_SCOPE)
7159 return;
7160 kid = kLISTOP->op_last; /* get past scope */
7161 switch(kid->op_type) {
7162 case OP_NCMP:
7163 case OP_I_NCMP:
7164 case OP_SCMP:
7165 break;
7166 default:
7167 return;
7168 }
7169 k = kid; /* remember this node*/
7170 if (kBINOP->op_first->op_type != OP_RV2SV)
7171 return;
7172 kid = kBINOP->op_first; /* get past cmp */
7173 if (kUNOP->op_first->op_type != OP_GV)
7174 return;
7175 kid = kUNOP->op_first; /* get past rv2sv */
638eceb6 7176 gv = kGVOP_gv;
350de78d 7177 if (GvSTASH(gv) != PL_curstash)
9c007264 7178 return;
770526c1
NC		 7179 gvname = GvNAME(gv);
7180 if (*gvname == 'a' && gvname[1] == '\0')
eb209983 7181 descending = 0;
770526c1 7182 else if (*gvname == 'b' && gvname[1] == '\0')
eb209983 7183 descending = 1;
9c007264
JH		 7184 else
7185 return;
eb209983 7186
9c007264
JH		 7187 kid = k; /* back to cmp */
7188 if (kBINOP->op_last->op_type != OP_RV2SV)
7189 return;
7190 kid = kBINOP->op_last; /* down to 2nd arg */
7191 if (kUNOP->op_first->op_type != OP_GV)
7192 return;
7193 kid = kUNOP->op_first; /* get past rv2sv */
638eceb6 7194 gv = kGVOP_gv;
770526c1
NC		 7195 if (GvSTASH(gv) != PL_curstash)
7196 return;
7197 gvname = GvNAME(gv);
7198 if ( descending
7199 ? !(*gvname == 'a' && gvname[1] == '\0')
7200 : !(*gvname == 'b' && gvname[1] == '\0'))
9c007264
JH		 7201 return;
7202 o->op_flags &= ~(OPf_STACKED | OPf_SPECIAL);
eb209983
NC		 7203 if (descending)
7204 o->op_private |= OPpSORT_DESCEND;
9c007264
JH		 7205 if (k->op_type == OP_NCMP)
7206 o->op_private |= OPpSORT_NUMERIC;
7207 if (k->op_type == OP_I_NCMP)
7208 o->op_private |= OPpSORT_NUMERIC | OPpSORT_INTEGER;
e507f050
SM		 7209 kid = cLISTOPo->op_first->op_sibling;
7210 cLISTOPo->op_first->op_sibling = kid->op_sibling; /* bypass old block */
eb8433b7
NC		 7211#ifdef PERL_MAD
7212 op_getmad(kid,o,'S'); /* then delete it */
7213#else
e507f050 7214 op_free(kid); /* then delete it */
eb8433b7 7215#endif
9c007264 7216}
79072805
LW		 7217
7218OP *
cea2e8a9 7219Perl_ck_split(pTHX_ OP *o)
79072805 7220{
27da23d5 7221 dVAR;
79072805 7222 register OP *kid;
aeea060c 7223
11343788
MB		 7224 if (o->op_flags & OPf_STACKED)
7225 return no_fh_allowed(o);
79072805 7226
11343788 7227 kid = cLISTOPo->op_first;
8990e307 7228 if (kid->op_type != OP_NULL)
cea2e8a9 7229 Perl_croak(aTHX_ "panic: ck_split");
8990e307 7230 kid = kid->op_sibling;
11343788
MB		 7231 op_free(cLISTOPo->op_first);
7232 cLISTOPo->op_first = kid;
85e6fe83 7233 if (!kid) {
396482e1 7234 cLISTOPo->op_first = kid = newSVOP(OP_CONST, 0, newSVpvs(" "));
11343788 7235 cLISTOPo->op_last = kid; /* There was only one element previously */
85e6fe83 7236 }
79072805 7237
de4bf5b3 7238 if (kid->op_type != OP_MATCH || kid->op_flags & OPf_STACKED) {
551405c4 7239 OP * const sibl = kid->op_sibling;
463ee0b2 7240 kid->op_sibling = 0;
131b3ad0 7241 kid = pmruntime( newPMOP(OP_MATCH, OPf_SPECIAL), kid, 0);
11343788
MB		 7242 if (cLISTOPo->op_first == cLISTOPo->op_last)
7243 cLISTOPo->op_last = kid;
7244 cLISTOPo->op_first = kid;
79072805
LW		 7245 kid->op_sibling = sibl;
7246 }
7247
7248 kid->op_type = OP_PUSHRE;
22c35a8c 7249 kid->op_ppaddr = PL_ppaddr[OP_PUSHRE];
79072805 7250 scalar(kid);
041457d9 7251 if (((PMOP *)kid)->op_pmflags & PMf_GLOBAL && ckWARN(WARN_REGEXP)) {
f34840d8
MJD		 7252 Perl_warner(aTHX_ packWARN(WARN_REGEXP),
7253 "Use of /g modifier is meaningless in split");
7254 }
79072805
LW		 7255
7256 if (!kid->op_sibling)
54b9620d 7257 append_elem(OP_SPLIT, o, newDEFSVOP());
79072805
LW		 7258
7259 kid = kid->op_sibling;
7260 scalar(kid);
7261
7262 if (!kid->op_sibling)
11343788 7263 append_elem(OP_SPLIT, o, newSVOP(OP_CONST, 0, newSViv(0)));
ce3e5c45 7264 assert(kid->op_sibling);
79072805
LW		 7265
7266 kid = kid->op_sibling;
7267 scalar(kid);
7268
7269 if (kid->op_sibling)
53e06cf0 7270 return too_many_arguments(o,OP_DESC(o));
79072805 7271
11343788 7272 return o;
79072805
LW		 7273}
7274
7275OP *
1c846c1f 7276Perl_ck_join(pTHX_ OP *o)
eb6e2d6f 7277{
551405c4 7278 const OP * const kid = cLISTOPo->op_first->op_sibling;
041457d9
DM		 7279 if (kid && kid->op_type == OP_MATCH) {
7280 if (ckWARN(WARN_SYNTAX)) {
6867be6d
AL		 7281 const REGEXP *re = PM_GETRE(kPMOP);
7282 const char *pmstr = re ? re->precomp : "STRING";
9014280d 7283 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
eb6e2d6f
GS		 7284 "/%s/ should probably be written as \"%s\"",
7285 pmstr, pmstr);
7286 }
7287 }
7288 return ck_fun(o);
7289}
7290
7291OP *
cea2e8a9 7292Perl_ck_subr(pTHX_ OP *o)
79072805 7293{
97aff369 7294 dVAR;
11343788
MB		 7295 OP *prev = ((cUNOPo->op_first->op_sibling)
7296 ? cUNOPo : ((UNOP*)cUNOPo->op_first))->op_first;
7297 OP *o2 = prev->op_sibling;
4633a7c4 7298 OP *cvop;
a0751766 7299 const char *proto = NULL;
cbf82dd0 7300 const char *proto_end = NULL;
c445ea15
AL		 7301 CV *cv = NULL;
7302 GV *namegv = NULL;
4633a7c4
LW		 7303 int optional = 0;
7304 I32 arg = 0;
5b794e05 7305 I32 contextclass = 0;
c445ea15 7306 char *e = NULL;
0723351e 7307 bool delete_op = 0;
4633a7c4 7308
d3011074 7309 o->op_private |= OPpENTERSUB_HASTARG;
11343788 7310 for (cvop = o2; cvop->op_sibling; cvop = cvop->op_sibling) ;
4633a7c4
LW		 7311 if (cvop->op_type == OP_RV2CV) {
7312 SVOP* tmpop;
11343788 7313 o->op_private |= (cvop->op_private & OPpENTERSUB_AMPER);
93c66552 7314 op_null(cvop); /* disable rv2cv */
4633a7c4 7315 tmpop = (SVOP*)((UNOP*)cvop)->op_first;
76cd736e 7316 if (tmpop->op_type == OP_GV && !(o->op_private & OPpENTERSUB_AMPER)) {
638eceb6 7317 GV *gv = cGVOPx_gv(tmpop);
350de78d 7318 cv = GvCVu(gv);
76cd736e
GS		 7319 if (!cv)
7320 tmpop->op_private |= OPpEARLY_CV;
06492da6
SF		 7321 else {
7322 if (SvPOK(cv)) {
cbf82dd0 7323 STRLEN len;
06492da6 7324 namegv = CvANON(cv) ? gv : CvGV(cv);
cbf82dd0
NC		 7325 proto = SvPV((SV*)cv, len);
7326 proto_end = proto + len;
06492da6
SF		 7327 }
7328 if (CvASSERTION(cv)) {
7329 if (PL_hints & HINT_ASSERTING) {
7330 if (PERLDB_ASSERTION && PL_curstash != PL_debstash)
7331 o->op_private |= OPpENTERSUB_DB;
7332 }
8fa7688f 7333 else {
0723351e 7334 delete_op = 1;
041457d9 7335 if (!(PL_hints & HINT_ASSERTIONSSEEN) && ckWARN(WARN_ASSERTIONS)) {
8fa7688f
SF		 7336 Perl_warner(aTHX_ packWARN(WARN_ASSERTIONS),
7337 "Impossible to activate assertion call");
7338 }
7339 }
06492da6 7340 }
46fc3d4c 7341 }
4633a7c4
LW		 7342 }
7343 }
f5d5a27c 7344 else if (cvop->op_type == OP_METHOD || cvop->op_type == OP_METHOD_NAMED) {
7a52d87a
GS		 7345 if (o2->op_type == OP_CONST)
7346 o2->op_private &= ~OPpCONST_STRICT;
58a40671 7347 else if (o2->op_type == OP_LIST) {
5f66b61c
AL		 7348 OP * const sib = ((UNOP*)o2)->op_first->op_sibling;
7349 if (sib && sib->op_type == OP_CONST)
7350 sib->op_private &= ~OPpCONST_STRICT;
58a40671 7351 }
7a52d87a 7352 }
3280af22
NIS		 7353 o->op_private |= (PL_hints & HINT_STRICT_REFS);
7354 if (PERLDB_SUB && PL_curstash != PL_debstash)
11343788
MB		 7355 o->op_private |= OPpENTERSUB_DB;
7356 while (o2 != cvop) {
eb8433b7
NC		 7357 OP* o3;
7358 if (PL_madskills && o2->op_type == OP_NULL)
7359 o3 = ((UNOP*)o2)->op_first;
7360 else
7361 o3 = o2;
4633a7c4 7362 if (proto) {
cbf82dd0 7363 if (proto >= proto_end)
5dc0d613 7364 return too_many_arguments(o, gv_ename(namegv));
cbf82dd0
NC		 7365
7366 switch (*proto) {
4633a7c4
LW		 7367 case ';':
7368 optional = 1;
7369 proto++;
7370 continue;
7371 case '$':
7372 proto++;
7373 arg++;
11343788 7374 scalar(o2);
4633a7c4
LW		 7375 break;
7376 case '%':
7377 case '@':
11343788 7378 list(o2);
4633a7c4
LW		 7379 arg++;
7380 break;
7381 case '&':
7382 proto++;
7383 arg++;
eb8433b7 7384 if (o3->op_type != OP_REFGEN && o3->op_type != OP_UNDEF)
75fc29ea
GS		 7385 bad_type(arg,
7386 arg == 1 ? "block or sub {}" : "sub {}",
eb8433b7 7387 gv_ename(namegv), o3);
4633a7c4
LW		 7388 break;
7389 case '*':
2ba6ecf4 7390 /* '*' allows any scalar type, including bareword */
4633a7c4
LW		 7391 proto++;
7392 arg++;
eb8433b7 7393 if (o3->op_type == OP_RV2GV)
2ba6ecf4 7394 goto wrapref; /* autoconvert GLOB -> GLOBref */
eb8433b7
NC		 7395 else if (o3->op_type == OP_CONST)
7396 o3->op_private &= ~OPpCONST_STRICT;
7397 else if (o3->op_type == OP_ENTERSUB) {
9675f7ac 7398 /* accidental subroutine, revert to bareword */
eb8433b7 7399 OP *gvop = ((UNOP*)o3)->op_first;
9675f7ac
GS		 7400 if (gvop && gvop->op_type == OP_NULL) {
7401 gvop = ((UNOP*)gvop)->op_first;
7402 if (gvop) {
7403 for (; gvop->op_sibling; gvop = gvop->op_sibling)
7404 ;
7405 if (gvop &&
7406 (gvop->op_private & OPpENTERSUB_NOPAREN) &&
7407 (gvop = ((UNOP*)gvop)->op_first) &&
7408 gvop->op_type == OP_GV)
7409 {
551405c4
AL		 7410 GV * const gv = cGVOPx_gv(gvop);
7411 OP * const sibling = o2->op_sibling;
396482e1 7412 SV * const n = newSVpvs("");
eb8433b7 7413#ifdef PERL_MAD
1d866c12 7414 OP * const oldo2 = o2;
eb8433b7 7415#else
9675f7ac 7416 op_free(o2);
eb8433b7 7417#endif
2a797ae2 7418 gv_fullname4(n, gv, "", FALSE);
2692f720 7419 o2 = newSVOP(OP_CONST, 0, n);
eb8433b7 7420 op_getmad(oldo2,o2,'O');
9675f7ac
GS		 7421 prev->op_sibling = o2;
7422 o2->op_sibling = sibling;
7423 }
7424 }
7425 }
7426 }
2ba6ecf4
GS		 7427 scalar(o2);
7428 break;
5b794e05
JH		 7429 case '[': case ']':
7430 goto oops;
7431 break;
4633a7c4
LW		 7432 case '\\':
7433 proto++;
7434 arg++;
5b794e05 7435 again:
4633a7c4 7436 switch (*proto++) {
5b794e05
JH		 7437 case '[':
7438 if (contextclass++ == 0) {
841d93c8 7439 e = strchr(proto, ']');
5b794e05
JH		 7440 if (!e || e == proto)
7441 goto oops;
7442 }
7443 else
7444 goto oops;
7445 goto again;
7446 break;
7447 case ']':
466bafcd 7448 if (contextclass) {
a0751766
NC		 7449 const char *p = proto;
7450 const char *const end = proto;
466bafcd 7451 contextclass = 0;
466bafcd 7452 while (*--p != '[');
a0751766
NC		 7453 bad_type(arg, Perl_form(aTHX_ "one of %.*s",
7454 (int)(end - p), p),
7455 gv_ename(namegv), o3);
466bafcd 7456 } else
5b794e05
JH		 7457 goto oops;
7458 break;
4633a7c4 7459 case '*':
eb8433b7 7460 if (o3->op_type == OP_RV2GV)
5b794e05
JH		 7461 goto wrapref;
7462 if (!contextclass)
eb8433b7 7463 bad_type(arg, "symbol", gv_ename(namegv), o3);
5b794e05 7464 break;
4633a7c4 7465 case '&':
eb8433b7 7466 if (o3->op_type == OP_ENTERSUB)
5b794e05
JH		 7467 goto wrapref;
7468 if (!contextclass)
eb8433b7
NC		 7469 bad_type(arg, "subroutine entry", gv_ename(namegv),
7470 o3);
5b794e05 7471 break;
4633a7c4 7472 case '$':
eb8433b7
NC		 7473 if (o3->op_type == OP_RV2SV ||
7474 o3->op_type == OP_PADSV ||
7475 o3->op_type == OP_HELEM ||
7476 o3->op_type == OP_AELEM ||
7477 o3->op_type == OP_THREADSV)
5b794e05
JH		 7478 goto wrapref;
7479 if (!contextclass)
eb8433b7 7480 bad_type(arg, "scalar", gv_ename(namegv), o3);
5b794e05 7481 break;
4633a7c4 7482 case '@':
eb8433b7
NC		 7483 if (o3->op_type == OP_RV2AV ||
7484 o3->op_type == OP_PADAV)
5b794e05
JH		 7485 goto wrapref;
7486 if (!contextclass)
eb8433b7 7487 bad_type(arg, "array", gv_ename(namegv), o3);
5b794e05 7488 break;
4633a7c4 7489 case '%':
eb8433b7
NC		 7490 if (o3->op_type == OP_RV2HV ||
7491 o3->op_type == OP_PADHV)
5b794e05
JH		 7492 goto wrapref;
7493 if (!contextclass)
eb8433b7 7494 bad_type(arg, "hash", gv_ename(namegv), o3);
5b794e05
JH		 7495 break;
7496 wrapref:
4633a7c4 7497 {
551405c4
AL		 7498 OP* const kid = o2;
7499 OP* const sib = kid->op_sibling;
4633a7c4 7500 kid->op_sibling = 0;
6fa846a0
GS		 7501 o2 = newUNOP(OP_REFGEN, 0, kid);
7502 o2->op_sibling = sib;
e858de61 7503 prev->op_sibling = o2;
4633a7c4 7504 }
841d93c8 7505 if (contextclass && e) {
5b794e05
JH		 7506 proto = e + 1;
7507 contextclass = 0;
7508 }
4633a7c4
LW		 7509 break;
7510 default: goto oops;
7511 }
5b794e05
JH		 7512 if (contextclass)
7513 goto again;
4633a7c4 7514 break;
b1cb66bf 7515 case ' ':
7516 proto++;
7517 continue;
4633a7c4
LW		 7518 default:
7519 oops:
35c1215d 7520 Perl_croak(aTHX_ "Malformed prototype for %s: %"SVf,
95b63a38 7521 gv_ename(namegv), (void*)cv);
4633a7c4
LW		 7522 }
7523 }
7524 else
11343788
MB		 7525 list(o2);
7526 mod(o2, OP_ENTERSUB);
7527 prev = o2;
7528 o2 = o2->op_sibling;
551405c4 7529 } /* while */
cbf82dd0
NC		 7530 if (proto && !optional && proto_end > proto &&
7531 (*proto != '@' && *proto != '%' && *proto != ';'))
5dc0d613 7532 return too_few_arguments(o, gv_ename(namegv));
0723351e 7533 if(delete_op) {
eb8433b7 7534#ifdef PERL_MAD
1d866c12 7535 OP * const oldo = o;
eb8433b7 7536#else
06492da6 7537 op_free(o);
eb8433b7 7538#endif
06492da6 7539 o=newSVOP(OP_CONST, 0, newSViv(0));
eb8433b7 7540 op_getmad(oldo,o,'O');
06492da6 7541 }
11343788 7542 return o;
79072805
LW		 7543}
7544
7545OP *
cea2e8a9 7546Perl_ck_svconst(pTHX_ OP *o)
8990e307 7547{
96a5add6 7548 PERL_UNUSED_CONTEXT;
11343788
MB		 7549 SvREADONLY_on(cSVOPo->op_sv);
7550 return o;
8990e307
LW		 7551}
7552
7553OP *
d4ac975e
GA		 7554Perl_ck_chdir(pTHX_ OP *o)
7555{
7556 if (o->op_flags & OPf_KIDS) {
1496a290 7557 SVOP * const kid = (SVOP*)cUNOPo->op_first;
d4ac975e
GA		 7558
7559 if (kid && kid->op_type == OP_CONST &&
7560 (kid->op_private & OPpCONST_BARE))
7561 {
7562 o->op_flags |= OPf_SPECIAL;
7563 kid->op_private &= ~OPpCONST_STRICT;
7564 }
7565 }
7566 return ck_fun(o);
7567}
7568
7569OP *
cea2e8a9 7570Perl_ck_trunc(pTHX_ OP *o)
79072805 7571{
11343788
MB		 7572 if (o->op_flags & OPf_KIDS) {
7573 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 7574
a0d0e21e
LW		 7575 if (kid->op_type == OP_NULL)
7576 kid = (SVOP*)kid->op_sibling;
bb53490d
GS		 7577 if (kid && kid->op_type == OP_CONST &&
7578 (kid->op_private & OPpCONST_BARE))
7579 {
11343788 7580 o->op_flags |= OPf_SPECIAL;
bb53490d
GS		 7581 kid->op_private &= ~OPpCONST_STRICT;
7582 }
79072805 7583 }
11343788 7584 return ck_fun(o);
79072805
LW		 7585}
7586
35fba0d9 7587OP *
bab9c0ac
RGS		 7588Perl_ck_unpack(pTHX_ OP *o)
7589{
7590 OP *kid = cLISTOPo->op_first;
7591 if (kid->op_sibling) {
7592 kid = kid->op_sibling;
7593 if (!kid->op_sibling)
7594 kid->op_sibling = newDEFSVOP();
7595 }
7596 return ck_fun(o);
7597}
7598
7599OP *
35fba0d9
RG		 7600Perl_ck_substr(pTHX_ OP *o)
7601{
7602 o = ck_fun(o);
1d866c12 7603 if ((o->op_flags & OPf_KIDS) && (o->op_private == 4)) {
35fba0d9
RG		 7604 OP *kid = cLISTOPo->op_first;
7605
7606 if (kid->op_type == OP_NULL)
7607 kid = kid->op_sibling;
7608 if (kid)
7609 kid->op_flags |= OPf_MOD;
7610
7611 }
7612 return o;
7613}
7614
61b743bb
DM		 7615/* A peephole optimizer. We visit the ops in the order they're to execute.
7616 * See the comments at the top of this file for more details about when
7617 * peep() is called */
463ee0b2 7618
79072805 7619void
864dbfa3 7620Perl_peep(pTHX_ register OP *o)
79072805 7621{
27da23d5 7622 dVAR;
c445ea15 7623 register OP* oldop = NULL;
2d8e6c8d 7624
2814eb74 7625 if (!o || o->op_opt)
79072805 7626 return;
a0d0e21e 7627 ENTER;
462e5cf6 7628 SAVEOP();
7766f137 7629 SAVEVPTR(PL_curcop);
a0d0e21e 7630 for (; o; o = o->op_next) {
2814eb74 7631 if (o->op_opt)
a0d0e21e 7632 break;
533c011a 7633 PL_op = o;
a0d0e21e 7634 switch (o->op_type) {
acb36ea4 7635 case OP_SETSTATE:
a0d0e21e
LW		 7636 case OP_NEXTSTATE:
7637 case OP_DBSTATE:
3280af22 7638 PL_curcop = ((COP*)o); /* for warnings */
2814eb74 7639 o->op_opt = 1;
a0d0e21e
LW		 7640 break;
7641
a0d0e21e 7642 case OP_CONST:
7a52d87a
GS		 7643 if (cSVOPo->op_private & OPpCONST_STRICT)
7644 no_bareword_allowed(o);
7766f137 7645#ifdef USE_ITHREADS
3848b962 7646 case OP_METHOD_NAMED:
7766f137
GS		 7647 /* Relocate sv to the pad for thread safety.
7648 * Despite being a "constant", the SV is written to,
7649 * for reference counts, sv_upgrade() etc. */
7650 if (cSVOP->op_sv) {
6867be6d 7651 const PADOFFSET ix = pad_alloc(OP_CONST, SVs_PADTMP);
330e22d5 7652 if (o->op_type == OP_CONST && SvPADTMP(cSVOPo->op_sv)) {
6a7129a1 7653 /* If op_sv is already a PADTMP then it is being used by
9a049f1c 7654 * some pad, so make a copy. */
dd2155a4
DM		 7655 sv_setsv(PAD_SVl(ix),cSVOPo->op_sv);
7656 SvREADONLY_on(PAD_SVl(ix));
6a7129a1
GS		 7657 SvREFCNT_dec(cSVOPo->op_sv);
7658 }
052ca17e
NC		 7659 else if (o->op_type == OP_CONST
7660 && cSVOPo->op_sv == &PL_sv_undef) {
7661 /* PL_sv_undef is hack - it's unsafe to store it in the
7662 AV that is the pad, because av_fetch treats values of
7663 PL_sv_undef as a "free" AV entry and will merrily
7664 replace them with a new SV, causing pad_alloc to think
7665 that this pad slot is free. (When, clearly, it is not)
7666 */
7667 SvOK_off(PAD_SVl(ix));
7668 SvPADTMP_on(PAD_SVl(ix));
7669 SvREADONLY_on(PAD_SVl(ix));
7670 }
6a7129a1 7671 else {
dd2155a4 7672 SvREFCNT_dec(PAD_SVl(ix));
6a7129a1 7673 SvPADTMP_on(cSVOPo->op_sv);
dd2155a4 7674 PAD_SETSV(ix, cSVOPo->op_sv);
9a049f1c 7675 /* XXX I don't know how this isn't readonly already. */
dd2155a4 7676 SvREADONLY_on(PAD_SVl(ix));
6a7129a1 7677 }
a0714e2c 7678 cSVOPo->op_sv = NULL;
7766f137
GS		 7679 o->op_targ = ix;
7680 }
7681#endif
2814eb74 7682 o->op_opt = 1;
07447971
GS		 7683 break;
7684
df91b2c5
AE		 7685 case OP_CONCAT:
7686 if (o->op_next && o->op_next->op_type == OP_STRINGIFY) {
7687 if (o->op_next->op_private & OPpTARGET_MY) {
7688 if (o->op_flags & OPf_STACKED) /* chained concats */
7689 goto ignore_optimization;
7690 else {
7691 /* assert(PL_opargs[o->op_type] & OA_TARGLEX); */
7692 o->op_targ = o->op_next->op_targ;
7693 o->op_next->op_targ = 0;
7694 o->op_private |= OPpTARGET_MY;
7695 }
7696 }
7697 op_null(o->op_next);
7698 }
7699 ignore_optimization:
2814eb74 7700 o->op_opt = 1;
df91b2c5 7701 break;
8990e307 7702 case OP_STUB:
54310121 7703 if ((o->op_flags & OPf_WANT) != OPf_WANT_LIST) {
2814eb74 7704 o->op_opt = 1;
54310121 7705 break; /* Scalar stub must produce undef. List stub is noop */
8990e307 7706 }
748a9306 7707 goto nothin;
79072805 7708 case OP_NULL:
acb36ea4
GS		 7709 if (o->op_targ == OP_NEXTSTATE
7710 || o->op_targ == OP_DBSTATE
7711 || o->op_targ == OP_SETSTATE)
7712 {
3280af22 7713 PL_curcop = ((COP*)o);
acb36ea4 7714 }
dad75012
AMS		 7715 /* XXX: We avoid setting op_seq here to prevent later calls
7716 to peep() from mistakenly concluding that optimisation
7717 has already occurred. This doesn't fix the real problem,
7718 though (See 20010220.007). AMS 20010719 */
2814eb74 7719 /* op_seq functionality is now replaced by op_opt */
dad75012
AMS		 7720 if (oldop && o->op_next) {
7721 oldop->op_next = o->op_next;
7722 continue;
7723 }
7724 break;
79072805 7725 case OP_SCALAR:
93a17b20 7726 case OP_LINESEQ:
463ee0b2 7727 case OP_SCOPE:
748a9306 7728 nothin:
a0d0e21e
LW		 7729 if (oldop && o->op_next) {
7730 oldop->op_next = o->op_next;
79072805
LW		 7731 continue;
7732 }
2814eb74 7733 o->op_opt = 1;
79072805
LW		 7734 break;
7735
6a077020 7736 case OP_PADAV:
79072805 7737 case OP_GV:
6a077020 7738 if (o->op_type == OP_PADAV || o->op_next->op_type == OP_RV2AV) {
0bd48802 7739 OP* const pop = (o->op_type == OP_PADAV) ?
6a077020 7740 o->op_next : o->op_next->op_next;
a0d0e21e 7741 IV i;
f9dc862f 7742 if (pop && pop->op_type == OP_CONST &&
af5acbb4 7743 ((PL_op = pop->op_next)) &&
8990e307 7744 pop->op_next->op_type == OP_AELEM &&
a0d0e21e 7745 !(pop->op_next->op_private &
78f9721b 7746 (OPpLVAL_INTRO|OPpLVAL_DEFER|OPpDEREF|OPpMAYBE_LVSUB)) &&
fc15ae8f 7747 (i = SvIV(((SVOP*)pop)->op_sv) - CopARYBASE_get(PL_curcop))
a0d0e21e 7748 <= 255 &&
8990e307
LW		 7749 i >= 0)
7750 {
350de78d 7751 GV *gv;
af5acbb4
DM		 7752 if (cSVOPx(pop)->op_private & OPpCONST_STRICT)
7753 no_bareword_allowed(pop);
6a077020
DM		 7754 if (o->op_type == OP_GV)
7755 op_null(o->op_next);
93c66552
DM		 7756 op_null(pop->op_next);
7757 op_null(pop);
a0d0e21e
LW		 7758 o->op_flags |= pop->op_next->op_flags & OPf_MOD;
7759 o->op_next = pop->op_next->op_next;
22c35a8c 7760 o->op_ppaddr = PL_ppaddr[OP_AELEMFAST];
a0d0e21e 7761 o->op_private = (U8)i;
6a077020
DM		 7762 if (o->op_type == OP_GV) {
7763 gv = cGVOPo_gv;
7764 GvAVn(gv);
7765 }
7766 else
7767 o->op_flags |= OPf_SPECIAL;
7768 o->op_type = OP_AELEMFAST;
7769 }
7770 o->op_opt = 1;
7771 break;
7772 }
7773
7774 if (o->op_next->op_type == OP_RV2SV) {
7775 if (!(o->op_next->op_private & OPpDEREF)) {
7776 op_null(o->op_next);
7777 o->op_private |= o->op_next->op_private & (OPpLVAL_INTRO
7778 | OPpOUR_INTRO);
7779 o->op_next = o->op_next->op_next;
7780 o->op_type = OP_GVSV;
7781 o->op_ppaddr = PL_ppaddr[OP_GVSV];
8990e307 7782 }
79072805 7783 }
e476b1b5 7784 else if ((o->op_private & OPpEARLY_CV) && ckWARN(WARN_PROTOTYPE)) {
551405c4 7785 GV * const gv = cGVOPo_gv;
b15aece3 7786 if (SvTYPE(gv) == SVt_PVGV && GvCV(gv) && SvPVX_const(GvCV(gv))) {
76cd736e 7787 /* XXX could check prototype here instead of just carping */
551405c4 7788 SV * const sv = sv_newmortal();
bd61b366 7789 gv_efullname3(sv, gv, NULL);
9014280d 7790 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE),
35c1215d 7791 "%"SVf"() called too early to check prototype",
95b63a38 7792 (void*)sv);
76cd736e
GS		 7793 }
7794 }
89de2904
AMS		 7795 else if (o->op_next->op_type == OP_READLINE
7796 && o->op_next->op_next->op_type == OP_CONCAT
7797 && (o->op_next->op_next->op_flags & OPf_STACKED))
7798 {
d2c45030
AMS		 7799 /* Turn "$a .= <FH>" into an OP_RCATLINE. AMS 20010917 */
7800 o->op_type = OP_RCATLINE;
7801 o->op_flags |= OPf_STACKED;
7802 o->op_ppaddr = PL_ppaddr[OP_RCATLINE];
89de2904 7803 op_null(o->op_next->op_next);
d2c45030 7804 op_null(o->op_next);
89de2904 7805 }
76cd736e 7806
2814eb74 7807 o->op_opt = 1;
79072805
LW		 7808 break;
7809
a0d0e21e 7810 case OP_MAPWHILE:
79072805
LW		 7811 case OP_GREPWHILE:
7812 case OP_AND:
7813 case OP_OR:
c963b151 7814 case OP_DOR:
2c2d71f5
JH		 7815 case OP_ANDASSIGN:
7816 case OP_ORASSIGN:
c963b151 7817 case OP_DORASSIGN:
1a67a97c
SM		 7818 case OP_COND_EXPR:
7819 case OP_RANGE:
2814eb74 7820 o->op_opt = 1;
fd4d1407
IZ		 7821 while (cLOGOP->op_other->op_type == OP_NULL)
7822 cLOGOP->op_other = cLOGOP->op_other->op_next;
a2efc822 7823 peep(cLOGOP->op_other); /* Recursive calls are not replaced by fptr calls */
79072805
LW		 7824 break;
7825
79072805 7826 case OP_ENTERLOOP:
9c2ca71a 7827 case OP_ENTERITER:
2814eb74 7828 o->op_opt = 1;
58cccf98
SM		 7829 while (cLOOP->op_redoop->op_type == OP_NULL)
7830 cLOOP->op_redoop = cLOOP->op_redoop->op_next;
79072805 7831 peep(cLOOP->op_redoop);
58cccf98
SM		 7832 while (cLOOP->op_nextop->op_type == OP_NULL)
7833 cLOOP->op_nextop = cLOOP->op_nextop->op_next;
79072805 7834 peep(cLOOP->op_nextop);
58cccf98
SM		 7835 while (cLOOP->op_lastop->op_type == OP_NULL)
7836 cLOOP->op_lastop = cLOOP->op_lastop->op_next;
79072805
LW		 7837 peep(cLOOP->op_lastop);
7838 break;
7839
8782bef2 7840 case OP_QR:
79072805
LW		 7841 case OP_MATCH:
7842 case OP_SUBST:
2814eb74 7843 o->op_opt = 1;
9041c2e3 7844 while (cPMOP->op_pmreplstart &&
58cccf98
SM		 7845 cPMOP->op_pmreplstart->op_type == OP_NULL)
7846 cPMOP->op_pmreplstart = cPMOP->op_pmreplstart->op_next;
a0d0e21e 7847 peep(cPMOP->op_pmreplstart);
79072805
LW		 7848 break;
7849
a0d0e21e 7850 case OP_EXEC:
2814eb74 7851 o->op_opt = 1;
041457d9
DM		 7852 if (o->op_next && o->op_next->op_type == OP_NEXTSTATE
7853 && ckWARN(WARN_SYNTAX))
7854 {
1496a290
AL		 7855 if (o->op_next->op_sibling) {
7856 const OPCODE type = o->op_next->op_sibling->op_type;
7857 if (type != OP_EXIT && type != OP_WARN && type != OP_DIE) {
7858 const line_t oldline = CopLINE(PL_curcop);
7859 CopLINE_set(PL_curcop, CopLINE((COP*)o->op_next));
7860 Perl_warner(aTHX_ packWARN(WARN_EXEC),
7861 "Statement unlikely to be reached");
7862 Perl_warner(aTHX_ packWARN(WARN_EXEC),
7863 "\t(Maybe you meant system() when you said exec()?)\n");
7864 CopLINE_set(PL_curcop, oldline);
7865 }
a0d0e21e
LW		 7866 }
7867 }
7868 break;
b2ffa427 7869
c750a3ec 7870 case OP_HELEM: {
e75d1f10 7871 UNOP *rop;
6d822dc4 7872 SV *lexname;
e75d1f10 7873 GV **fields;
6d822dc4 7874 SV **svp, *sv;
d5263905 7875 const char *key = NULL;
c750a3ec 7876 STRLEN keylen;
b2ffa427 7877
2814eb74 7878 o->op_opt = 1;
1c846c1f
NIS		 7879
7880 if (((BINOP*)o)->op_last->op_type != OP_CONST)
c750a3ec 7881 break;
1c846c1f
NIS		 7882
7883 /* Make the CONST have a shared SV */
7884 svp = cSVOPx_svp(((BINOP*)o)->op_last);
3049cdab 7885 if ((!SvFAKE(sv = *svp) || !SvREADONLY(sv)) && !IS_PADCONST(sv)) {
d5263905 7886 key = SvPV_const(sv, keylen);
25716404 7887 lexname = newSVpvn_share(key,
bb7a0f54 7888 SvUTF8(sv) ? -(I32)keylen : (I32)keylen,
25716404 7889 0);
1c846c1f
NIS		 7890 SvREFCNT_dec(sv);
7891 *svp = lexname;
7892 }
e75d1f10
RD		 7893
7894 if ((o->op_private & (OPpLVAL_INTRO)))
7895 break;
7896
7897 rop = (UNOP*)((BINOP*)o)->op_first;
7898 if (rop->op_type != OP_RV2HV || rop->op_first->op_type != OP_PADSV)
7899 break;
7900 lexname = *av_fetch(PL_comppad_name, rop->op_first->op_targ, TRUE);
00b1698f 7901 if (!SvPAD_TYPED(lexname))
e75d1f10 7902 break;
a4fc7abc 7903 fields = (GV**)hv_fetchs(SvSTASH(lexname), "FIELDS", FALSE);
e75d1f10
RD		 7904 if (!fields || !GvHV(*fields))
7905 break;
93524f2b 7906 key = SvPV_const(*svp, keylen);
e75d1f10 7907 if (!hv_fetch(GvHV(*fields), key,
bb7a0f54 7908 SvUTF8(*svp) ? -(I32)keylen : (I32)keylen, FALSE))
e75d1f10
RD		 7909 {
7910 Perl_croak(aTHX_ "No such class field \"%s\" "
7911 "in variable %s of type %s",
93524f2b 7912 key, SvPV_nolen_const(lexname), HvNAME_get(SvSTASH(lexname)));
e75d1f10
RD		 7913 }
7914
6d822dc4
MS		 7915 break;
7916 }
c750a3ec 7917
e75d1f10
RD		 7918 case OP_HSLICE: {
7919 UNOP *rop;
7920 SV *lexname;
7921 GV **fields;
7922 SV **svp;
93524f2b 7923 const char *key;
e75d1f10
RD		 7924 STRLEN keylen;
7925 SVOP *first_key_op, *key_op;
7926
7927 if ((o->op_private & (OPpLVAL_INTRO))
7928 /* I bet there's always a pushmark... */
7929 || ((LISTOP*)o)->op_first->op_sibling->op_type != OP_LIST)
7930 /* hmmm, no optimization if list contains only one key. */
7931 break;
7932 rop = (UNOP*)((LISTOP*)o)->op_last;
7933 if (rop->op_type != OP_RV2HV)
7934 break;
7935 if (rop->op_first->op_type == OP_PADSV)
7936 /* @$hash{qw(keys here)} */
7937 rop = (UNOP*)rop->op_first;
7938 else {
7939 /* @{$hash}{qw(keys here)} */
7940 if (rop->op_first->op_type == OP_SCOPE
7941 && cLISTOPx(rop->op_first)->op_last->op_type == OP_PADSV)
7942 {
7943 rop = (UNOP*)cLISTOPx(rop->op_first)->op_last;
7944 }
7945 else
7946 break;
7947 }
7948
7949 lexname = *av_fetch(PL_comppad_name, rop->op_targ, TRUE);
00b1698f 7950 if (!SvPAD_TYPED(lexname))
e75d1f10 7951 break;
a4fc7abc 7952 fields = (GV**)hv_fetchs(SvSTASH(lexname), "FIELDS", FALSE);
e75d1f10
RD		 7953 if (!fields || !GvHV(*fields))
7954 break;
7955 /* Again guessing that the pushmark can be jumped over.... */
7956 first_key_op = (SVOP*)((LISTOP*)((LISTOP*)o)->op_first->op_sibling)
7957 ->op_first->op_sibling;
7958 for (key_op = first_key_op; key_op;
7959 key_op = (SVOP*)key_op->op_sibling) {
7960 if (key_op->op_type != OP_CONST)
7961 continue;
7962 svp = cSVOPx_svp(key_op);
93524f2b 7963 key = SvPV_const(*svp, keylen);
e75d1f10 7964 if (!hv_fetch(GvHV(*fields), key,
bb7a0f54 7965 SvUTF8(*svp) ? -(I32)keylen : (I32)keylen, FALSE))
e75d1f10
RD		 7966 {
7967 Perl_croak(aTHX_ "No such class field \"%s\" "
7968 "in variable %s of type %s",
bfcb3514 7969 key, SvPV_nolen(lexname), HvNAME_get(SvSTASH(lexname)));
e75d1f10
RD		 7970 }
7971 }
7972 break;
7973 }
7974
fe1bc4cf 7975 case OP_SORT: {
fe1bc4cf 7976 /* will point to RV2AV or PADAV op on LHS/RHS of assign */
551405c4 7977 OP *oleft;
fe1bc4cf
DM		 7978 OP *o2;
7979
fe1bc4cf 7980 /* check that RHS of sort is a single plain array */
551405c4 7981 OP *oright = cUNOPo->op_first;
fe1bc4cf
DM		 7982 if (!oright || oright->op_type != OP_PUSHMARK)
7983 break;
471178c0
NC		 7984
7985 /* reverse sort ... can be optimised. */
7986 if (!cUNOPo->op_sibling) {
7987 /* Nothing follows us on the list. */
551405c4 7988 OP * const reverse = o->op_next;
471178c0
NC		 7989
7990 if (reverse->op_type == OP_REVERSE &&
7991 (reverse->op_flags & OPf_WANT) == OPf_WANT_LIST) {
551405c4 7992 OP * const pushmark = cUNOPx(reverse)->op_first;
471178c0
NC		 7993 if (pushmark && (pushmark->op_type == OP_PUSHMARK)
7994 && (cUNOPx(pushmark)->op_sibling == o)) {
7995 /* reverse -> pushmark -> sort */
7996 o->op_private |= OPpSORT_REVERSE;
7997 op_null(reverse);
7998 pushmark->op_next = oright->op_next;
7999 op_null(oright);
8000 }
8001 }
8002 }
8003
8004 /* make @a = sort @a act in-place */
8005
8006 o->op_opt = 1;
8007
fe1bc4cf
DM		 8008 oright = cUNOPx(oright)->op_sibling;
8009 if (!oright)
8010 break;
8011 if (oright->op_type == OP_NULL) { /* skip sort block/sub */
8012 oright = cUNOPx(oright)->op_sibling;
8013 }
8014
8015 if (!oright ||
8016 (oright->op_type != OP_RV2AV && oright->op_type != OP_PADAV)
8017 || oright->op_next != o
8018 || (oright->op_private & OPpLVAL_INTRO)
8019 )
8020 break;
8021
8022 /* o2 follows the chain of op_nexts through the LHS of the
8023 * assign (if any) to the aassign op itself */
8024 o2 = o->op_next;
8025 if (!o2 || o2->op_type != OP_NULL)
8026 break;
8027 o2 = o2->op_next;
8028 if (!o2 || o2->op_type != OP_PUSHMARK)
8029 break;
8030 o2 = o2->op_next;
8031 if (o2 && o2->op_type == OP_GV)
8032 o2 = o2->op_next;
8033 if (!o2
8034 || (o2->op_type != OP_PADAV && o2->op_type != OP_RV2AV)
8035 || (o2->op_private & OPpLVAL_INTRO)
8036 )
8037 break;
8038 oleft = o2;
8039 o2 = o2->op_next;
8040 if (!o2 || o2->op_type != OP_NULL)
8041 break;
8042 o2 = o2->op_next;
8043 if (!o2 || o2->op_type != OP_AASSIGN
8044 || (o2->op_flags & OPf_WANT) != OPf_WANT_VOID)
8045 break;
8046
db7511db
DM		 8047 /* check that the sort is the first arg on RHS of assign */
8048
8049 o2 = cUNOPx(o2)->op_first;
8050 if (!o2 || o2->op_type != OP_NULL)
8051 break;
8052 o2 = cUNOPx(o2)->op_first;
8053 if (!o2 || o2->op_type != OP_PUSHMARK)
8054 break;
8055 if (o2->op_sibling != o)
8056 break;
8057
fe1bc4cf
DM		 8058 /* check the array is the same on both sides */
8059 if (oleft->op_type == OP_RV2AV) {
8060 if (oright->op_type != OP_RV2AV
8061 || !cUNOPx(oright)->op_first
8062 || cUNOPx(oright)->op_first->op_type != OP_GV
8063 || cGVOPx_gv(cUNOPx(oleft)->op_first) !=
8064 cGVOPx_gv(cUNOPx(oright)->op_first)
8065 )
8066 break;
8067 }
8068 else if (oright->op_type != OP_PADAV
8069 || oright->op_targ != oleft->op_targ
8070 )
8071 break;
8072
8073 /* transfer MODishness etc from LHS arg to RHS arg */
8074 oright->op_flags = oleft->op_flags;
8075 o->op_private |= OPpSORT_INPLACE;
8076
8077 /* excise push->gv->rv2av->null->aassign */
8078 o2 = o->op_next->op_next;
8079 op_null(o2); /* PUSHMARK */
8080 o2 = o2->op_next;
8081 if (o2->op_type == OP_GV) {
8082 op_null(o2); /* GV */
8083 o2 = o2->op_next;
8084 }
8085 op_null(o2); /* RV2AV or PADAV */
8086 o2 = o2->op_next->op_next;
8087 op_null(o2); /* AASSIGN */
8088
8089 o->op_next = o2->op_next;
8090
8091 break;
8092 }
ef3e5ea9
NC		 8093
8094 case OP_REVERSE: {
e682d7b7 8095 OP *ourmark, *theirmark, *ourlast, *iter, *expushmark, *rv2av;
ce335f37 8096 OP *gvop = NULL;
ef3e5ea9
NC		 8097 LISTOP *enter, *exlist;
8098 o->op_opt = 1;
8099
8100 enter = (LISTOP *) o->op_next;
8101 if (!enter)
8102 break;
8103 if (enter->op_type == OP_NULL) {
8104 enter = (LISTOP *) enter->op_next;
8105 if (!enter)
8106 break;
8107 }
d46f46af
NC		 8108 /* for $a (...) will have OP_GV then OP_RV2GV here.
8109 for (...) just has an OP_GV. */
ce335f37
NC		 8110 if (enter->op_type == OP_GV) {
8111 gvop = (OP *) enter;
8112 enter = (LISTOP *) enter->op_next;
8113 if (!enter)
8114 break;
d46f46af
NC		 8115 if (enter->op_type == OP_RV2GV) {
8116 enter = (LISTOP *) enter->op_next;
8117 if (!enter)
ce335f37 8118 break;
d46f46af 8119 }
ce335f37
NC		 8120 }
8121
ef3e5ea9
NC		 8122 if (enter->op_type != OP_ENTERITER)
8123 break;
8124
8125 iter = enter->op_next;
8126 if (!iter || iter->op_type != OP_ITER)
8127 break;
8128
ce335f37
NC		 8129 expushmark = enter->op_first;
8130 if (!expushmark || expushmark->op_type != OP_NULL
8131 || expushmark->op_targ != OP_PUSHMARK)
8132 break;
8133
8134 exlist = (LISTOP *) expushmark->op_sibling;
ef3e5ea9
NC		 8135 if (!exlist || exlist->op_type != OP_NULL
8136 || exlist->op_targ != OP_LIST)
8137 break;
8138
8139 if (exlist->op_last != o) {
8140 /* Mmm. Was expecting to point back to this op. */
8141 break;
8142 }
8143 theirmark = exlist->op_first;
8144 if (!theirmark || theirmark->op_type != OP_PUSHMARK)
8145 break;
8146
c491ecac 8147 if (theirmark->op_sibling != o) {
ef3e5ea9
NC		 8148 /* There's something between the mark and the reverse, eg
8149 for (1, reverse (...))
8150 so no go. */
8151 break;
8152 }
8153
c491ecac
NC		 8154 ourmark = ((LISTOP *)o)->op_first;
8155 if (!ourmark || ourmark->op_type != OP_PUSHMARK)
8156 break;
8157
ef3e5ea9
NC		 8158 ourlast = ((LISTOP *)o)->op_last;
8159 if (!ourlast || ourlast->op_next != o)
8160 break;
8161
e682d7b7
NC		 8162 rv2av = ourmark->op_sibling;
8163 if (rv2av && rv2av->op_type == OP_RV2AV && rv2av->op_sibling == 0
8164 && rv2av->op_flags == (OPf_WANT_LIST | OPf_KIDS)
8165 && enter->op_flags == (OPf_WANT_LIST | OPf_KIDS)) {
8166 /* We're just reversing a single array. */
8167 rv2av->op_flags = OPf_WANT_SCALAR | OPf_KIDS | OPf_REF;
8168 enter->op_flags |= OPf_STACKED;
8169 }
8170
ef3e5ea9
NC		 8171 /* We don't have control over who points to theirmark, so sacrifice
8172 ours. */
8173 theirmark->op_next = ourmark->op_next;
8174 theirmark->op_flags = ourmark->op_flags;
ce335f37 8175 ourlast->op_next = gvop ? gvop : (OP *) enter;
ef3e5ea9
NC		 8176 op_null(ourmark);
8177 op_null(o);
8178 enter->op_private |= OPpITER_REVERSED;
8179 iter->op_private |= OPpITER_REVERSED;
8180
8181 break;
8182 }
e26df76a
NC		 8183
8184 case OP_SASSIGN: {
8185 OP *rv2gv;
8186 UNOP *refgen, *rv2cv;
8187 LISTOP *exlist;
8188
8189 /* I do not understand this, but if o->op_opt isn't set to 1,
8190 various tests in ext/B/t/bytecode.t fail with no readily
8191 apparent cause. */
8192
8193 o->op_opt = 1;
8194
de3370bc
NC		 8195
8196 if ((o->op_flags && OPf_WANT) != OPf_WANT_VOID)
8197 break;
8198
e26df76a
NC		 8199 if ((o->op_private & ~OPpASSIGN_BACKWARDS) != 2)
8200 break;
8201
8202 rv2gv = ((BINOP *)o)->op_last;
8203 if (!rv2gv || rv2gv->op_type != OP_RV2GV)
8204 break;
8205
8206 refgen = (UNOP *)((BINOP *)o)->op_first;
8207
8208 if (!refgen || refgen->op_type != OP_REFGEN)
8209 break;
8210
8211 exlist = (LISTOP *)refgen->op_first;
8212 if (!exlist || exlist->op_type != OP_NULL
8213 || exlist->op_targ != OP_LIST)
8214 break;
8215
8216 if (exlist->op_first->op_type != OP_PUSHMARK)
8217 break;
8218
8219 rv2cv = (UNOP*)exlist->op_last;
8220
8221 if (rv2cv->op_type != OP_RV2CV)
8222 break;
8223
8224 assert ((rv2gv->op_private & OPpDONT_INIT_GV) == 0);
8225 assert ((o->op_private & OPpASSIGN_CV_TO_GV) == 0);
8226 assert ((rv2cv->op_private & OPpMAY_RETURN_CONSTANT) == 0);
8227
8228 o->op_private |= OPpASSIGN_CV_TO_GV;
8229 rv2gv->op_private |= OPpDONT_INIT_GV;
8230 rv2cv->op_private |= OPpMAY_RETURN_CONSTANT;
8231
8232 break;
8233 }
8234
fe1bc4cf 8235
79072805 8236 default:
2814eb74 8237 o->op_opt = 1;
79072805
LW		 8238 break;
8239 }
a0d0e21e 8240 oldop = o;
79072805 8241 }
a0d0e21e 8242 LEAVE;
79072805 8243}
beab0874 8244
1cb0ed9b
RGS		 8245char*
8246Perl_custom_op_name(pTHX_ const OP* o)
53e06cf0 8247{
97aff369 8248 dVAR;
e1ec3a88 8249 const IV index = PTR2IV(o->op_ppaddr);
53e06cf0
SC		 8250 SV* keysv;
8251 HE* he;
8252
8253 if (!PL_custom_op_names) /* This probably shouldn't happen */
27da23d5 8254 return (char *)PL_op_name[OP_CUSTOM];
53e06cf0
SC		 8255
8256 keysv = sv_2mortal(newSViv(index));
8257
8258 he = hv_fetch_ent(PL_custom_op_names, keysv, 0, 0);
8259 if (!he)
27da23d5 8260 return (char *)PL_op_name[OP_CUSTOM]; /* Don't know who you are */
53e06cf0
SC		 8261
8262 return SvPV_nolen(HeVAL(he));
8263}
8264
1cb0ed9b
RGS		 8265char*
8266Perl_custom_op_desc(pTHX_ const OP* o)
53e06cf0 8267{
97aff369 8268 dVAR;
e1ec3a88 8269 const IV index = PTR2IV(o->op_ppaddr);
53e06cf0
SC		 8270 SV* keysv;
8271 HE* he;
8272
8273 if (!PL_custom_op_descs)
27da23d5 8274 return (char *)PL_op_desc[OP_CUSTOM];
53e06cf0
SC		 8275
8276 keysv = sv_2mortal(newSViv(index));
8277
8278 he = hv_fetch_ent(PL_custom_op_descs, keysv, 0, 0);
8279 if (!he)
27da23d5 8280 return (char *)PL_op_desc[OP_CUSTOM];
53e06cf0
SC		 8281
8282 return SvPV_nolen(HeVAL(he));
8283}
19e8ce8e 8284
beab0874
JT		 8285#include "XSUB.h"
8286
8287/* Efficient sub that returns a constant scalar value. */
8288static void
acfe0abc 8289const_sv_xsub(pTHX_ CV* cv)
beab0874 8290{
97aff369 8291 dVAR;
beab0874 8292 dXSARGS;
9cbac4c7 8293 if (items != 0) {
6f207bd3 8294 NOOP;
9cbac4c7
DM		 8295#if 0
8296 Perl_croak(aTHX_ "usage: %s::%s()",
bfcb3514 8297 HvNAME_get(GvSTASH(CvGV(cv))), GvNAME(CvGV(cv)));
9cbac4c7
DM		 8298#endif
8299 }
9a049f1c 8300 EXTEND(sp, 1);
0768512c 8301 ST(0) = (SV*)XSANY.any_ptr;
beab0874
JT		 8302 XSRETURN(1);
8303}
4946a0fa
NC		 8304
8305/*
8306 * Local variables:
8307 * c-indentation-style: bsd
8308 * c-basic-offset: 4
8309 * indent-tabs-mode: t
8310 * End:
8311 *
37442d52
RGS		 8312 * ex: set ts=8 sts=4 sw=4 noet:
8313 */
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