3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
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.
12 #undef sv_flags /* Convex has this in <signal.h> for sigvec() */
18 =for apidoc AmU||svtype
19 An enum of flags for Perl types. These are found in the file B<sv.h>
20 in the C<svtype> enum. Test these flags with the C<SvTYPE> macro.
42 These are most easily explained from the bottom up.
44 SVt_PVIO is for I/O objects, SVt_PVFM for formats, SVt_PVCV for
45 subroutines, SVt_PVHV for hashes and SVt_PVAV for arrays.
47 All the others are scalar types, that is, things that can be bound to a
48 C<$> variable. For these, the internal types are mostly orthogonal to
49 types in the Perl language.
51 Hence, checking C<< SvTYPE(sv) < SVt_PVAV >> is the best way to see whether
52 something is a scalar.
54 SVt_PVGV represents a typeglob. If !SvFAKE(sv), then it is a real,
55 incoercible typeglob. If SvFAKE(sv), then it is a scalar to which a
56 typeglob has been assigned. Assigning to it again will stop it from being
57 a typeglob. SVt_PVLV represents a scalar that delegates to another scalar
58 behind the scenes. It is used, e.g., for the return value of C<substr> and
59 for tied hash and array elements. It can hold any scalar value, including
60 a typeglob. SVt_REGEXP is for regular expressions.
62 SVt_PVMG represents a "normal" scalar (not a typeglob, regular expression,
63 or delegate). Since most scalars do not need all the internal fields of a
64 PVMG, we save memory by allocating smaller structs when possible. All the
65 other types are just simpler forms of SVt_PVMG, with fewer internal fields.
66 SVt_NULL can only hold undef. SVt_IV can hold undef, an integer, or a
67 reference. (SVt_RV is an alias for SVt_IV, which exists for backward
68 compatibility.) SVt_NV can hold any of those or a double. SVt_PV can only
69 hold undef or a string. SVt_PVIV is a superset of SVt_PV and SVt_IV.
70 SVt_PVNV is similar. SVt_PVMG can hold anything SVt_PVNV can hold, but it
71 can, but does not have to, be blessed or magical.
73 =for apidoc AmU||SVt_NULL
74 Type flag for scalars. See L</svtype>.
76 =for apidoc AmU||SVt_IV
77 Type flag for scalars. See L</svtype>.
79 =for apidoc AmU||SVt_NV
80 Type flag for scalars. See L</svtype>.
82 =for apidoc AmU||SVt_PV
83 Type flag for scalars. See L</svtype>.
85 =for apidoc AmU||SVt_PVIV
86 Type flag for scalars. See L</svtype>.
88 =for apidoc AmU||SVt_PVNV
89 Type flag for scalars. See L</svtype>.
91 =for apidoc AmU||SVt_PVMG
92 Type flag for scalars. See L</svtype>.
94 =for apidoc AmU||SVt_REGEXP
95 Type flag for regular expressions. See L</svtype>.
97 =for apidoc AmU||SVt_PVGV
98 Type flag for typeglobs. See L</svtype>.
100 =for apidoc AmU||SVt_PVLV
101 Type flag for scalars. See L</svtype>.
103 =for apidoc AmU||SVt_PVAV
104 Type flag for arrays. See L</svtype>.
106 =for apidoc AmU||SVt_PVHV
107 Type flag for hashes. See L</svtype>.
109 =for apidoc AmU||SVt_PVCV
110 Type flag for subroutines. See L</svtype>.
112 =for apidoc AmU||SVt_PVFM
113 Type flag for formats. See L</svtype>.
115 =for apidoc AmU||SVt_PVIO
116 Type flag for I/O objects. See L</svtype>.
126 /* RV was here, before it was merged with IV. */
132 /* PVBM was here, before BIND replaced it. */
140 SVt_LAST /* keep last in enum. used to size arrays */
143 /* *** any alterations to the SV types above need to be reflected in
144 * SVt_MASK and the various PL_valid_types_* tables */
146 #define SVt_MASK 0xf /* smallest bitmask that covers all types */
149 /* Although Fast Boyer Moore tables are now being stored in PVGVs, for most
150 purposes eternal code wanting to consider PVBM probably needs to think of
152 # define SVt_PVBM SVt_PVMG
153 /* Anything wanting to create a reference from clean should ensure that it has
154 a scalar of type SVt_IV now: */
155 # define SVt_RV SVt_IV
158 /* There is collusion here with sv_clear - sv_clear exits early for SVt_NULL
159 so never reaches the clause at the end that uses sv_type_details->body_size
160 to determine whether to call safefree(). Hence body_size can be set
161 non-zero to record the size of HEs, without fear of bogus frees. */
162 #if defined(PERL_IN_HV_C) || defined(PERL_IN_XS_APITEST)
163 #define HE_SVSLOT SVt_NULL
166 #define PERL_ARENA_ROOTS_SIZE (SVt_LAST)
168 /* typedefs to eliminate some typing */
169 typedef struct he HE;
170 typedef struct hek HEK;
172 /* Using C's structural equivalence to help emulate C++ inheritance here... */
174 /* start with 2 sv-head building blocks */
175 #define _SV_HEAD(ptrtype) \
176 ptrtype sv_any; /* pointer to body */ \
177 U32 sv_refcnt; /* how many references to us */ \
178 U32 sv_flags /* what we are */
180 #define _SV_HEAD_UNION \
182 char* svu_pv; /* pointer to malloced string */ \
185 SV* svu_rv; /* pointer to another SV */ \
186 struct regexp* svu_rx; \
194 struct STRUCT_SV { /* struct sv { */
197 #ifdef DEBUG_LEAKING_SCALARS
198 PERL_BITFIELD32 sv_debug_optype:9; /* the type of OP that allocated us */
199 PERL_BITFIELD32 sv_debug_inpad:1; /* was allocated in a pad for an OP */
200 PERL_BITFIELD32 sv_debug_line:16; /* the line where we were allocated */
201 UV sv_debug_serial; /* serial number of sv allocation */
202 char * sv_debug_file; /* the file where we were allocated */
203 SV * sv_debug_parent; /* what we were cloned from (ithreads)*/
208 _SV_HEAD(XPVGV*); /* pointer to xpvgv body */
213 _SV_HEAD(XPVCV*); /* pointer to xpvcv body */
218 _SV_HEAD(XPVAV*); /* pointer to xpvav body */
223 _SV_HEAD(XPVHV*); /* pointer to xpvhv body */
228 _SV_HEAD(XPVIO*); /* pointer to xpvio body */
233 _SV_HEAD(struct regexp*); /* pointer to regexp body */
238 #undef _SV_HEAD_UNION /* ensure no pollution */
241 =head1 SV Manipulation Functions
243 =for apidoc Am|U32|SvREFCNT|SV* sv
244 Returns the value of the object's reference count.
246 =for apidoc Am|SV*|SvREFCNT_inc|SV* sv
247 Increments the reference count of the given SV, returning the SV.
249 All of the following SvREFCNT_inc* macros are optimized versions of
250 SvREFCNT_inc, and can be replaced with SvREFCNT_inc.
252 =for apidoc Am|SV*|SvREFCNT_inc_NN|SV* sv
253 Same as SvREFCNT_inc, but can only be used if you know I<sv>
254 is not NULL. Since we don't have to check the NULLness, it's faster
257 =for apidoc Am|void|SvREFCNT_inc_void|SV* sv
258 Same as SvREFCNT_inc, but can only be used if you don't need the
259 return value. The macro doesn't need to return a meaningful value.
261 =for apidoc Am|void|SvREFCNT_inc_void_NN|SV* sv
262 Same as SvREFCNT_inc, but can only be used if you don't need the return
263 value, and you know that I<sv> is not NULL. The macro doesn't need
264 to return a meaningful value, or check for NULLness, so it's smaller
267 =for apidoc Am|SV*|SvREFCNT_inc_simple|SV* sv
268 Same as SvREFCNT_inc, but can only be used with expressions without side
269 effects. Since we don't have to store a temporary value, it's faster.
271 =for apidoc Am|SV*|SvREFCNT_inc_simple_NN|SV* sv
272 Same as SvREFCNT_inc_simple, but can only be used if you know I<sv>
273 is not NULL. Since we don't have to check the NULLness, it's faster
276 =for apidoc Am|void|SvREFCNT_inc_simple_void|SV* sv
277 Same as SvREFCNT_inc_simple, but can only be used if you don't need the
278 return value. The macro doesn't need to return a meaningful value.
280 =for apidoc Am|void|SvREFCNT_inc_simple_void_NN|SV* sv
281 Same as SvREFCNT_inc, but can only be used if you don't need the return
282 value, and you know that I<sv> is not NULL. The macro doesn't need
283 to return a meaningful value, or check for NULLness, so it's smaller
286 =for apidoc Am|void|SvREFCNT_dec|SV* sv
287 Decrements the reference count of the given SV. I<sv> may be NULL.
289 =for apidoc Am|void|SvREFCNT_dec_NN|SV* sv
290 Same as SvREFCNT_dec, but can only be used if you know I<sv>
291 is not NULL. Since we don't have to check the NULLness, it's faster
294 =for apidoc Am|svtype|SvTYPE|SV* sv
295 Returns the type of the SV. See C<svtype>.
297 =for apidoc Am|void|SvUPGRADE|SV* sv|svtype type
298 Used to upgrade an SV to a more complex form. Uses C<sv_upgrade> to
299 perform the upgrade if necessary. See C<svtype>.
304 #define SvANY(sv) (sv)->sv_any
305 #define SvFLAGS(sv) (sv)->sv_flags
306 #define SvREFCNT(sv) (sv)->sv_refcnt
308 #define SvREFCNT_inc(sv) S_SvREFCNT_inc(MUTABLE_SV(sv))
309 #define SvREFCNT_inc_simple(sv) SvREFCNT_inc(sv)
310 #define SvREFCNT_inc_NN(sv) S_SvREFCNT_inc_NN(MUTABLE_SV(sv))
311 #define SvREFCNT_inc_void(sv) S_SvREFCNT_inc_void(MUTABLE_SV(sv))
313 /* These guys don't need the curly blocks */
314 #define SvREFCNT_inc_simple_void(sv) STMT_START { if (sv) SvREFCNT(sv)++; } STMT_END
315 #define SvREFCNT_inc_simple_NN(sv) (++(SvREFCNT(sv)),MUTABLE_SV(sv))
316 #define SvREFCNT_inc_void_NN(sv) (void)(++SvREFCNT(MUTABLE_SV(sv)))
317 #define SvREFCNT_inc_simple_void_NN(sv) (void)(++SvREFCNT(MUTABLE_SV(sv)))
319 #define SvREFCNT_dec(sv) S_SvREFCNT_dec(aTHX_ MUTABLE_SV(sv))
320 #define SvREFCNT_dec_NN(sv) S_SvREFCNT_dec_NN(aTHX_ MUTABLE_SV(sv))
322 #define SVTYPEMASK 0xff
323 #define SvTYPE(sv) ((svtype)((sv)->sv_flags & SVTYPEMASK))
325 /* Sadly there are some parts of the core that have pointers to already-freed
326 SV heads, and rely on being able to tell that they are now free. So mark
327 them all by using a consistent macro. */
328 #define SvIS_FREED(sv) ((sv)->sv_flags == SVTYPEMASK)
330 /* this is defined in this peculiar way to avoid compiler warnings.
331 * See the <20121213131428.GD1842@iabyn.com> thread in p5p */
332 #define SvUPGRADE(sv, mt) \
333 ((void)(SvTYPE(sv) >= (mt) || (sv_upgrade(sv, mt),1)))
335 #define SVf_IOK 0x00000100 /* has valid public integer value */
336 #define SVf_NOK 0x00000200 /* has valid public numeric value */
337 #define SVf_POK 0x00000400 /* has valid public pointer value */
338 #define SVf_ROK 0x00000800 /* has a valid reference pointer */
340 #define SVp_IOK 0x00001000 /* has valid non-public integer value */
341 #define SVp_NOK 0x00002000 /* has valid non-public numeric value */
342 #define SVp_POK 0x00004000 /* has valid non-public pointer value */
343 #define SVp_SCREAM 0x00008000 /* method name is DOES */
344 #define SVphv_CLONEABLE SVp_SCREAM /* PVHV (stashes) clone its objects */
345 #define SVpgv_GP SVp_SCREAM /* GV has a valid GP */
346 #define SVprv_PCS_IMPORTED SVp_SCREAM /* RV is a proxy for a constant
347 subroutine in another package. Set the
348 GvIMPORTED_CV_on() if it needs to be
349 expanded to a real GV */
350 #define SVf_IsCOW 0x00010000 /* copy on write (shared hash key if
352 #define SVs_PADTMP 0x00020000 /* in use as tmp; only if ! SVs_PADMY */
353 #define SVs_PADSTALE 0x00020000 /* lexical has gone out of scope;
354 only valid for SVs_PADMY */
355 #define SVpad_TYPED 0x00020000 /* pad name is a Typed Lexical */
356 #define SVs_PADMY 0x00040000 /* in use a "my" variable */
357 #define SVpad_OUR 0x00040000 /* pad name is "our" instead of "my" */
358 #define SVs_TEMP 0x00080000 /* string is stealable? */
359 #define SVs_OBJECT 0x00100000 /* is "blessed" */
360 #define SVs_GMG 0x00200000 /* has magical get method */
361 #define SVs_SMG 0x00400000 /* has magical set method */
362 #define SVs_RMG 0x00800000 /* has random magical methods */
364 #define SVf_FAKE 0x01000000 /* 0: glob is just a copy
365 1: SV head arena wasn't malloc()ed
366 2: For PVCV, whether CvUNIQUE(cv)
367 refers to an eval or once only
368 [CvEVAL(cv), CvSPECIAL(cv)]
369 3: On a pad name SV, that slot in the
370 frame AV is a REFCNT'ed reference
371 to a lexical from "outside". */
372 #define SVf_OOK 0x02000000 /* has valid offset value. For a PVHV this
373 means that a hv_aux struct is present
374 after the main array */
375 #define SVf_BREAK 0x04000000 /* refcnt is artificially low - used by
376 SVs in final arena cleanup.
377 Set in S_regtry on PL_reg_curpm, so that
378 perl_destruct will skip it. */
379 #define SVf_READONLY 0x08000000 /* may not be modified */
384 #define SVf_THINKFIRST (SVf_READONLY|SVf_ROK|SVf_FAKE|SVs_RMG|SVf_IsCOW)
386 #define SVf_OK (SVf_IOK|SVf_NOK|SVf_POK|SVf_ROK| \
387 SVp_IOK|SVp_NOK|SVp_POK|SVpgv_GP)
389 #define PRIVSHIFT 4 /* (SVp_?OK >> PRIVSHIFT) == SVf_?OK */
391 #define SVf_AMAGIC 0x10000000 /* has magical overloaded methods */
393 /* Ensure this value does not clash with the GV_ADD* flags in gv.h: */
394 #define SVf_UTF8 0x20000000 /* SvPV is UTF-8 encoded
395 This is also set on RVs whose overloaded
396 stringification is UTF-8. This might
397 only happen as a side effect of SvPV() */
400 /* Some private flags. */
402 /* PVAV could probably use 0x2000000 without conflict. I assume that PVFM can
403 be UTF-8 encoded, and PVCVs could well have UTF-8 prototypes. PVIOs haven't
404 been restructured, so sometimes get used as string buffers. */
407 #define SVphv_SHAREKEYS 0x20000000 /* PVHV keys live on shared string table */
409 /* PVNV, PVMG only, and only used in pads. Should be safe to test on any scalar
410 SV, as the core is careful to avoid setting both.
412 SVf_POK, SVp_POK also set:
414 0x0000C400 method name for DOES (SvSCREAM)
415 0x40004400 FBM compiled (SvVALID)
418 0x00008000 GV with GP
419 0x00008800 RV with PCS imported
421 #define SVpad_NAME (SVp_SCREAM|SVpbm_VALID)
422 /* This SV is a name in the PAD, so
423 SVpad_TYPED, SVpad_OUR and SVpad_STATE
426 #define SVpav_REAL 0x40000000 /* free old entries */
428 #define SVphv_LAZYDEL 0x40000000 /* entry in xhv_eiter must be deleted */
429 /* This is only set true on a PVGV when it's playing "PVBM", but is tested for
430 on any regular scalar (anything <= PVLV) */
431 #define SVpbm_VALID 0x40000000
432 /* Only used in toke.c on an SV stored in PL_lex_repl */
433 #define SVrepl_EVAL 0x40000000 /* Replacement part of s///e */
435 /* IV, PVIV, PVNV, PVMG, PVGV and (I assume) PVLV */
436 #define SVf_IVisUV 0x80000000 /* use XPVUV instead of XPVIV */
438 #define SVpav_REIFY 0x80000000 /* can become real */
440 #define SVphv_HASKFLAGS 0x80000000 /* keys have flag byte after hash */
441 /* PVGV when SVpbm_VALID is true */
442 #define SVpbm_TAIL 0x80000000
443 /* RV upwards. However, SVf_ROK and SVp_IOK are exclusive */
444 #define SVprv_WEAKREF 0x80000000 /* Weak reference */
445 /* pad name vars only */
446 #define SVpad_STATE 0x80000000 /* pad name is a "state" var */
449 HV* xmg_stash; /* class package */ \
451 STRLEN xpv_cur; /* length of svu_pv as a C string */ \
453 STRLEN xpvlenu_len; /* allocated size */ \
454 char * xpvlenu_pv; /* regexp string */ \
457 #define xpv_len xpv_len_u.xpvlenu_len
460 NV xnv_nv; /* numeric value, if any */
465 } xpad_cop_seq; /* used by pad.c for cop_sequence */
468 U8 xbm_rare; /* rarest character in string */
469 } xbm_s; /* fields from PVBM */
473 IV xivu_iv; /* integer value */
475 HEK * xivu_namehek; /* xpvlv, xpvgv: GvNAME */
479 MAGIC* xmg_magic; /* linked list of magicalness */
480 HV* xmg_ourstash; /* Stash for our (when SvPAD_OUR is true) */
481 STRLEN xmg_hash_index; /* used while freeing hash entries */
493 #define xiv_iv xiv_u.xivu_iv
500 #define xuv_uv xuv_u.xivu_uv
508 /* This structure must match the beginning of struct xpvhv in hv.h. */
522 char xlv_type; /* k=keys .=pos x=substr v=vec /=join/re
523 * y=alem/helem/iter t=tie T=tied HE */
524 char xlv_flags; /* 1 = negative offset 2 = negative len */
527 /* This structure works in 3 ways - regular scalar, GV with GP, or fast
535 typedef U16 cv_flags_t;
537 #define _XPVCV_COMMON \
545 void (*xcv_xsub) (pTHX_ CV*); \
552 PADLIST * xcv_padlist; \
554 U32 xcv_outside_seq; /* the COP sequence (at the point of our \
555 * compilation) in the lexically enclosing \
557 cv_flags_t xcv_flags; \
558 I32 xcv_depth /* >= 2 indicates recursive call */
560 /* This structure must match XPVCV in cv.h */
571 /* ifp and ofp are normally the same, but sockets need separate streams */
573 /* Cray addresses everything by word boundaries (64 bits) and
574 * code and data pointers cannot be mixed (which is exactly what
575 * Perl_filter_add() tries to do with the dirp), hence the
576 * following union trick (as suggested by Gurusamy Sarathy).
577 * For further information see Geir Johansen's problem report
578 * titled [ID 20000612.002] Perl problem on Cray system
579 * The any pointer (known as IoANY()) will also be a good place
580 * to hang any IO disciplines to.
583 DIR * xiou_dirp; /* for opendir, readdir, etc */
584 void * xiou_any; /* for alignment */
586 /* IV xio_lines is now in IVX $. */
587 IV xio_page; /* $% */
588 IV xio_page_len; /* $= */
589 IV xio_lines_left; /* $- */
590 char * xio_top_name; /* $^ */
591 GV * xio_top_gv; /* $^ */
592 char * xio_fmt_name; /* $~ */
593 GV * xio_fmt_gv; /* $~ */
594 char * xio_bottom_name;/* $^B */
595 GV * xio_bottom_gv; /* $^B */
600 #define xio_dirp xio_dirpu.xiou_dirp
601 #define xio_any xio_dirpu.xiou_any
603 #define IOf_ARGV 1 /* this fp iterates over ARGV */
604 #define IOf_START 2 /* check for null ARGV and substitute '-' */
605 #define IOf_FLUSH 4 /* this fp wants a flush after write op */
606 #define IOf_DIDTOP 8 /* just did top of form */
607 #define IOf_UNTAINT 16 /* consider this fp (and its data) "safe" */
608 #define IOf_NOLINE 32 /* slurped a pseudo-line from empty file */
609 #define IOf_FAKE_DIRP 64 /* xio_dirp is fake (source filters kludge)
610 Also, when this is set, SvPVX() is valid */
612 /* The following macros define implementation-independent predicates on SVs. */
615 =for apidoc Am|U32|SvNIOK|SV* sv
616 Returns a U32 value indicating whether the SV contains a number, integer or
619 =for apidoc Am|U32|SvNIOKp|SV* sv
620 Returns a U32 value indicating whether the SV contains a number, integer or
621 double. Checks the B<private> setting. Use C<SvNIOK> instead.
623 =for apidoc Am|void|SvNIOK_off|SV* sv
624 Unsets the NV/IV status of an SV.
626 =for apidoc Am|U32|SvOK|SV* sv
627 Returns a U32 value indicating whether the value is defined. This is
628 only meaningful for scalars.
630 =for apidoc Am|U32|SvIOKp|SV* sv
631 Returns a U32 value indicating whether the SV contains an integer. Checks
632 the B<private> setting. Use C<SvIOK> instead.
634 =for apidoc Am|U32|SvNOKp|SV* sv
635 Returns a U32 value indicating whether the SV contains a double. Checks the
636 B<private> setting. Use C<SvNOK> instead.
638 =for apidoc Am|U32|SvPOKp|SV* sv
639 Returns a U32 value indicating whether the SV contains a character string.
640 Checks the B<private> setting. Use C<SvPOK> instead.
642 =for apidoc Am|U32|SvIOK|SV* sv
643 Returns a U32 value indicating whether the SV contains an integer.
645 =for apidoc Am|void|SvIOK_on|SV* sv
646 Tells an SV that it is an integer.
648 =for apidoc Am|void|SvIOK_off|SV* sv
649 Unsets the IV status of an SV.
651 =for apidoc Am|void|SvIOK_only|SV* sv
652 Tells an SV that it is an integer and disables all other OK bits.
654 =for apidoc Am|void|SvIOK_only_UV|SV* sv
655 Tells an SV that it is an unsigned integer and disables all other OK bits.
657 =for apidoc Am|bool|SvIOK_UV|SV* sv
658 Returns a boolean indicating whether the SV contains an integer that must be
659 interpreted as unsigned. A non-negative integer whose value is within the
660 range of both an IV and a UV may be be flagged as either SvUOK or SVIOK.
662 =for apidoc Am|bool|SvUOK|SV* sv
663 Returns a boolean indicating whether the SV contains an integer that must be
664 interpreted as unsigned. A non-negative integer whose value is within the
665 range of both an IV and a UV may be be flagged as either SvUOK or SVIOK.
667 =for apidoc Am|bool|SvIOK_notUV|SV* sv
668 Returns a boolean indicating whether the SV contains a signed integer.
670 =for apidoc Am|U32|SvNOK|SV* sv
671 Returns a U32 value indicating whether the SV contains a double.
673 =for apidoc Am|void|SvNOK_on|SV* sv
674 Tells an SV that it is a double.
676 =for apidoc Am|void|SvNOK_off|SV* sv
677 Unsets the NV status of an SV.
679 =for apidoc Am|void|SvNOK_only|SV* sv
680 Tells an SV that it is a double and disables all other OK bits.
682 =for apidoc Am|U32|SvPOK|SV* sv
683 Returns a U32 value indicating whether the SV contains a character
686 =for apidoc Am|void|SvPOK_on|SV* sv
687 Tells an SV that it is a string.
689 =for apidoc Am|void|SvPOK_off|SV* sv
690 Unsets the PV status of an SV.
692 =for apidoc Am|void|SvPOK_only|SV* sv
693 Tells an SV that it is a string and disables all other OK bits.
694 Will also turn off the UTF-8 status.
696 =for apidoc Am|bool|SvVOK|SV* sv
697 Returns a boolean indicating whether the SV contains a v-string.
699 =for apidoc Am|U32|SvOOK|SV* sv
700 Returns a U32 indicating whether the pointer to the string buffer is offset.
701 This hack is used internally to speed up removal of characters from the
702 beginning of a SvPV. When SvOOK is true, then the start of the
703 allocated string buffer is actually C<SvOOK_offset()> bytes before SvPVX.
704 This offset used to be stored in SvIVX, but is now stored within the spare
707 =for apidoc Am|U32|SvROK|SV* sv
708 Tests if the SV is an RV.
710 =for apidoc Am|void|SvROK_on|SV* sv
711 Tells an SV that it is an RV.
713 =for apidoc Am|void|SvROK_off|SV* sv
714 Unsets the RV status of an SV.
716 =for apidoc Am|SV*|SvRV|SV* sv
717 Dereferences an RV to return the SV.
719 =for apidoc Am|IV|SvIVX|SV* sv
720 Returns the raw value in the SV's IV slot, without checks or conversions.
721 Only use when you are sure SvIOK is true. See also C<SvIV()>.
723 =for apidoc Am|UV|SvUVX|SV* sv
724 Returns the raw value in the SV's UV slot, without checks or conversions.
725 Only use when you are sure SvIOK is true. See also C<SvUV()>.
727 =for apidoc Am|NV|SvNVX|SV* sv
728 Returns the raw value in the SV's NV slot, without checks or conversions.
729 Only use when you are sure SvNOK is true. See also C<SvNV()>.
731 =for apidoc Am|char*|SvPVX|SV* sv
732 Returns a pointer to the physical string in the SV. The SV must contain a
733 string. Prior to 5.9.3 it is not safe to execute this macro unless the SV's
736 This is also used to store the name of an autoloaded subroutine in an XS
737 AUTOLOAD routine. See L<perlguts/Autoloading with XSUBs>.
739 =for apidoc Am|STRLEN|SvCUR|SV* sv
740 Returns the length of the string which is in the SV. See C<SvLEN>.
742 =for apidoc Am|STRLEN|SvLEN|SV* sv
743 Returns the size of the string buffer in the SV, not including any part
744 attributable to C<SvOOK>. See C<SvCUR>.
746 =for apidoc Am|char*|SvEND|SV* sv
747 Returns a pointer to the spot just after the last character in
748 the string which is in the SV, where there is usually a trailing
749 null (even though Perl scalars do not strictly require it).
750 See C<SvCUR>. Access the character as *(SvEND(sv)).
752 Warning: If C<SvCUR> is equal to C<SvLEN>, then C<SvEND> points to
755 =for apidoc Am|HV*|SvSTASH|SV* sv
756 Returns the stash of the SV.
758 =for apidoc Am|void|SvIV_set|SV* sv|IV val
759 Set the value of the IV pointer in sv to val. It is possible to perform
760 the same function of this macro with an lvalue assignment to C<SvIVX>.
761 With future Perls, however, it will be more efficient to use
762 C<SvIV_set> instead of the lvalue assignment to C<SvIVX>.
764 =for apidoc Am|void|SvNV_set|SV* sv|NV val
765 Set the value of the NV pointer in sv to val. See C<SvIV_set>.
767 =for apidoc Am|void|SvPV_set|SV* sv|char* val
768 Set the value of the PV pointer in sv to val. See also C<SvIV_set>.
770 Beware that the existing pointer may be involved in copy-on-write or other
771 mischief, so do C<SvOOK_off(sv)> and use C<sv_force_normal> or
772 C<SvPV_force> (or check the SvIsCOW flag) first to make sure this
773 modification is safe.
775 =for apidoc Am|void|SvUV_set|SV* sv|UV val
776 Set the value of the UV pointer in sv to val. See C<SvIV_set>.
778 =for apidoc Am|void|SvRV_set|SV* sv|SV* val
779 Set the value of the RV pointer in sv to val. See C<SvIV_set>.
781 =for apidoc Am|void|SvMAGIC_set|SV* sv|MAGIC* val
782 Set the value of the MAGIC pointer in sv to val. See C<SvIV_set>.
784 =for apidoc Am|void|SvSTASH_set|SV* sv|HV* val
785 Set the value of the STASH pointer in sv to val. See C<SvIV_set>.
787 =for apidoc Am|void|SvCUR_set|SV* sv|STRLEN len
788 Set the current length of the string which is in the SV. See C<SvCUR>
791 =for apidoc Am|void|SvLEN_set|SV* sv|STRLEN len
792 Set the actual length of the string which is in the SV. See C<SvIV_set>.
797 #define SvNIOK(sv) (SvFLAGS(sv) & (SVf_IOK|SVf_NOK))
798 #define SvNIOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK))
799 #define SvNIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK| \
800 SVp_IOK|SVp_NOK|SVf_IVisUV))
802 #define assert_not_ROK(sv) assert_(!SvROK(sv) || !SvRV(sv))
803 #define assert_not_glob(sv) assert_(!isGV_with_GP(sv))
805 #define SvOK(sv) (SvFLAGS(sv) & SVf_OK || isREGEXP(sv))
806 #define SvOK_off(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
807 SvFLAGS(sv) &= ~(SVf_OK| \
808 SVf_IVisUV|SVf_UTF8), \
810 #define SvOK_off_exc_UV(sv) (assert_not_ROK(sv) \
811 SvFLAGS(sv) &= ~(SVf_OK| \
815 #define SvOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK))
816 #define SvIOKp(sv) (SvFLAGS(sv) & SVp_IOK)
817 #define SvIOKp_on(sv) (assert_not_glob(sv) SvRELEASE_IVX_(sv) \
818 SvFLAGS(sv) |= SVp_IOK)
819 #define SvNOKp(sv) (SvFLAGS(sv) & SVp_NOK)
820 #define SvNOKp_on(sv) (assert_not_glob(sv) SvFLAGS(sv) |= SVp_NOK)
821 #define SvPOKp(sv) (SvFLAGS(sv) & SVp_POK)
822 #define SvPOKp_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
823 SvFLAGS(sv) |= SVp_POK)
825 #define SvIOK(sv) (SvFLAGS(sv) & SVf_IOK)
826 #define SvIOK_on(sv) (assert_not_glob(sv) SvRELEASE_IVX_(sv) \
827 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
828 #define SvIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVp_IOK|SVf_IVisUV))
829 #define SvIOK_only(sv) (SvOK_off(sv), \
830 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
831 #define SvIOK_only_UV(sv) (assert_not_glob(sv) SvOK_off_exc_UV(sv), \
832 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
834 #define SvIOK_UV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
835 == (SVf_IOK|SVf_IVisUV))
836 #define SvUOK(sv) SvIOK_UV(sv)
837 #define SvIOK_notUV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
840 #define SvIsUV(sv) (SvFLAGS(sv) & SVf_IVisUV)
841 #define SvIsUV_on(sv) (SvFLAGS(sv) |= SVf_IVisUV)
842 #define SvIsUV_off(sv) (SvFLAGS(sv) &= ~SVf_IVisUV)
844 #define SvNOK(sv) (SvFLAGS(sv) & SVf_NOK)
845 #define SvNOK_on(sv) (assert_not_glob(sv) \
846 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
847 #define SvNOK_off(sv) (SvFLAGS(sv) &= ~(SVf_NOK|SVp_NOK))
848 #define SvNOK_only(sv) (SvOK_off(sv), \
849 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
852 =for apidoc Am|U32|SvUTF8|SV* sv
853 Returns a U32 value indicating the UTF-8 status of an SV. If things are set-up
854 properly, this indicates whether or not the SV contains UTF-8 encoded data.
855 Call this after SvPV() in case any call to string overloading updates the
858 =for apidoc Am|void|SvUTF8_on|SV *sv
859 Turn on the UTF-8 status of an SV (the data is not changed, just the flag).
860 Do not use frivolously.
862 =for apidoc Am|void|SvUTF8_off|SV *sv
863 Unsets the UTF-8 status of an SV (the data is not changed, just the flag).
864 Do not use frivolously.
866 =for apidoc Am|void|SvPOK_only_UTF8|SV* sv
867 Tells an SV that it is a string and disables all other OK bits,
868 and leaves the UTF-8 status as it was.
873 /* Ensure the return value of this macro does not clash with the GV_ADD* flags
875 #define SvUTF8(sv) (SvFLAGS(sv) & SVf_UTF8)
876 #define SvUTF8_on(sv) (SvFLAGS(sv) |= (SVf_UTF8))
877 #define SvUTF8_off(sv) (SvFLAGS(sv) &= ~(SVf_UTF8))
879 #define SvPOK(sv) (SvFLAGS(sv) & SVf_POK)
880 #define SvPOK_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
881 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
882 #define SvPOK_off(sv) (SvFLAGS(sv) &= ~(SVf_POK|SVp_POK))
883 #define SvPOK_only(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
884 SvFLAGS(sv) &= ~(SVf_OK| \
885 SVf_IVisUV|SVf_UTF8), \
886 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
887 #define SvPOK_only_UTF8(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
888 SvFLAGS(sv) &= ~(SVf_OK| \
890 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
892 #define SvVOK(sv) (SvMAGICAL(sv) \
893 && mg_find(sv,PERL_MAGIC_vstring))
894 /* returns the vstring magic, if any */
895 #define SvVSTRING_mg(sv) (SvMAGICAL(sv) \
896 ? mg_find(sv,PERL_MAGIC_vstring) : NULL)
898 #define SvOOK(sv) (SvFLAGS(sv) & SVf_OOK)
899 #define SvOOK_on(sv) (SvFLAGS(sv) |= SVf_OOK)
900 #define SvOOK_off(sv) ((void)(SvOOK(sv) && sv_backoff(sv)))
902 #define SvFAKE(sv) (SvFLAGS(sv) & SVf_FAKE)
903 #define SvFAKE_on(sv) (SvFLAGS(sv) |= SVf_FAKE)
904 #define SvFAKE_off(sv) (SvFLAGS(sv) &= ~SVf_FAKE)
906 #define SvROK(sv) (SvFLAGS(sv) & SVf_ROK)
907 #define SvROK_on(sv) (SvFLAGS(sv) |= SVf_ROK)
908 #define SvROK_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK))
910 #define SvMAGICAL(sv) (SvFLAGS(sv) & (SVs_GMG|SVs_SMG|SVs_RMG))
911 #define SvMAGICAL_on(sv) (SvFLAGS(sv) |= (SVs_GMG|SVs_SMG|SVs_RMG))
912 #define SvMAGICAL_off(sv) (SvFLAGS(sv) &= ~(SVs_GMG|SVs_SMG|SVs_RMG))
914 #define SvGMAGICAL(sv) (SvFLAGS(sv) & SVs_GMG)
915 #define SvGMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_GMG)
916 #define SvGMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_GMG)
918 #define SvSMAGICAL(sv) (SvFLAGS(sv) & SVs_SMG)
919 #define SvSMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_SMG)
920 #define SvSMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_SMG)
922 #define SvRMAGICAL(sv) (SvFLAGS(sv) & SVs_RMG)
923 #define SvRMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_RMG)
924 #define SvRMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_RMG)
926 #define SvAMAGIC(sv) (SvROK(sv) && SvOBJECT(SvRV(sv)) && \
927 HvAMAGIC(SvSTASH(SvRV(sv))))
929 /* To be used on the stashes themselves: */
930 #define HvAMAGIC(hv) (SvFLAGS(hv) & SVf_AMAGIC)
931 #define HvAMAGIC_on(hv) (SvFLAGS(hv) |= SVf_AMAGIC)
932 #define HvAMAGIC_off(hv) (SvFLAGS(hv) &=~ SVf_AMAGIC)
935 #define SvPOK_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVs_GMG)) == SVf_POK)
936 #define SvIOK_nog(sv) ((SvFLAGS(sv) & (SVf_IOK|SVs_GMG)) == SVf_IOK)
937 #define SvUOK_nog(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV|SVs_GMG)) == (SVf_IOK|SVf_IVisUV))
938 #define SvNOK_nog(sv) ((SvFLAGS(sv) & (SVf_NOK|SVs_GMG)) == SVf_NOK)
939 #define SvNIOK_nog(sv) (SvNIOK(sv) && !(SvFLAGS(sv) & SVs_GMG))
941 #define SvPOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
942 #define SvIOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_THINKFIRST|SVs_GMG)) == SVf_IOK)
943 #define SvUOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV|SVf_THINKFIRST|SVs_GMG)) == (SVf_IOK|SVf_IVisUV))
944 #define SvNOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_NOK|SVf_THINKFIRST|SVs_GMG)) == SVf_NOK)
945 #define SvNIOK_nogthink(sv) (SvNIOK(sv) && !(SvFLAGS(sv) & (SVf_THINKFIRST|SVs_GMG)))
947 #define SvPOK_utf8_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVs_GMG)) == (SVf_POK|SVf_UTF8))
948 #define SvPOK_utf8_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST|SVs_GMG)) == (SVf_POK|SVf_UTF8))
950 #define SvPOK_byte_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVs_GMG)) == SVf_POK)
951 #define SvPOK_byte_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
953 #define SvPOK_pure_nogthink(sv) \
954 ((SvFLAGS(sv) & (SVf_POK|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
955 #define SvPOK_utf8_pure_nogthink(sv) \
956 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == (SVf_POK|SVf_UTF8))
957 #define SvPOK_byte_pure_nogthink(sv) \
958 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
961 =for apidoc Am|U32|SvGAMAGIC|SV* sv
963 Returns true if the SV has get magic or
964 overloading. If either is true then
965 the scalar is active data, and has the potential to return a new value every
966 time it is accessed. Hence you must be careful to
967 only read it once per user logical operation and work
968 with that returned value. If neither is true then
969 the scalar's value cannot change unless written to.
974 #define SvGAMAGIC(sv) (SvGMAGICAL(sv) || SvAMAGIC(sv))
976 #define Gv_AMG(stash) \
977 (HvNAME(stash) && Gv_AMupdate(stash,FALSE) \
979 : (HvAMAGIC_off(stash), 0))
981 #define SvWEAKREF(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_WEAKREF)) \
982 == (SVf_ROK|SVprv_WEAKREF))
983 #define SvWEAKREF_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_WEAKREF))
984 #define SvWEAKREF_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_WEAKREF))
986 #define SvPCS_IMPORTED(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_PCS_IMPORTED)) \
987 == (SVf_ROK|SVprv_PCS_IMPORTED))
988 #define SvPCS_IMPORTED_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_PCS_IMPORTED))
989 #define SvPCS_IMPORTED_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_PCS_IMPORTED))
992 =for apidoc m|U32|SvTHINKFIRST|SV *sv
994 A quick flag check to see whether an sv should be passed to sv_force_normal
995 to be "downgraded" before SvIVX or SvPVX can be modified directly.
997 For example, if your scalar is a reference and you want to modify the SvIVX
998 slot, you can't just do SvROK_off, as that will leak the referent.
1000 This is used internally by various sv-modifying functions, such as
1001 sv_setsv, sv_setiv and sv_pvn_force.
1003 One case that this does not handle is a gv without SvFAKE set. After
1005 if (SvTHINKFIRST(gv)) sv_force_normal(gv);
1007 it will still be a gv.
1009 SvTHINKFIRST sometimes produces false positives. In those cases
1010 sv_force_normal does nothing.
1015 #define SvTHINKFIRST(sv) (SvFLAGS(sv) & SVf_THINKFIRST)
1017 #define SvPADMY(sv) (SvFLAGS(sv) & SVs_PADMY)
1018 #define SvPADMY_on(sv) (SvFLAGS(sv) |= SVs_PADMY)
1020 /* SVs_PADTMP and SVs_PADSTALE share the same bit, mediated by SVs_PADMY */
1022 #define SvPADTMP(sv) ((SvFLAGS(sv) & (SVs_PADMY|SVs_PADTMP)) == SVs_PADTMP)
1023 #define SvPADSTALE(sv) ((SvFLAGS(sv) & (SVs_PADMY|SVs_PADSTALE)) \
1024 == (SVs_PADMY|SVs_PADSTALE))
1026 #define SvPADTMP_on(sv) S_SvPADTMP_on(MUTABLE_SV(sv))
1027 #define SvPADTMP_off(sv) S_SvPADTMP_off(MUTABLE_SV(sv))
1028 #define SvPADSTALE_on(sv) S_SvPADSTALE_on(MUTABLE_SV(sv))
1029 #define SvPADSTALE_off(sv) S_SvPADSTALE_off(MUTABLE_SV(sv))
1031 #define SvTEMP(sv) (SvFLAGS(sv) & SVs_TEMP)
1032 #define SvTEMP_on(sv) (SvFLAGS(sv) |= SVs_TEMP)
1033 #define SvTEMP_off(sv) (SvFLAGS(sv) &= ~SVs_TEMP)
1035 #define SvOBJECT(sv) (SvFLAGS(sv) & SVs_OBJECT)
1036 #define SvOBJECT_on(sv) (SvFLAGS(sv) |= SVs_OBJECT)
1037 #define SvOBJECT_off(sv) (SvFLAGS(sv) &= ~SVs_OBJECT)
1039 #define SvREADONLY(sv) (SvFLAGS(sv) & SVf_READONLY)
1040 #define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1041 #define SvREADONLY_off(sv) (SvFLAGS(sv) &= ~SVf_READONLY)
1043 #define SvSCREAM(sv) ((SvFLAGS(sv) & (SVp_SCREAM|SVp_POK)) == (SVp_SCREAM|SVp_POK))
1044 #define SvSCREAM_on(sv) (SvFLAGS(sv) |= SVp_SCREAM)
1045 #define SvSCREAM_off(sv) (SvFLAGS(sv) &= ~SVp_SCREAM)
1048 # define SvCOMPILED(sv) 0
1049 # define SvCOMPILED_on(sv)
1050 # define SvCOMPILED_off(sv)
1053 #define SvEVALED(sv) (SvFLAGS(sv) & SVrepl_EVAL)
1054 #define SvEVALED_on(sv) (SvFLAGS(sv) |= SVrepl_EVAL)
1055 #define SvEVALED_off(sv) (SvFLAGS(sv) &= ~SVrepl_EVAL)
1057 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1058 # define SvVALID(sv) ({ const SV *const _svvalid = (const SV*)(sv); \
1059 if (SvFLAGS(_svvalid) & SVpbm_VALID) \
1060 assert(!isGV_with_GP(_svvalid)); \
1061 (SvFLAGS(_svvalid) & SVpbm_VALID); \
1063 # define SvVALID_on(sv) ({ SV *const _svvalid = MUTABLE_SV(sv); \
1064 assert(!isGV_with_GP(_svvalid)); \
1065 (SvFLAGS(_svvalid) |= SVpbm_VALID); \
1067 # define SvVALID_off(sv) ({ SV *const _svvalid = MUTABLE_SV(sv); \
1068 assert(!isGV_with_GP(_svvalid)); \
1069 (SvFLAGS(_svvalid) &= ~SVpbm_VALID); \
1072 # define SvTAIL(sv) ({ const SV *const _svtail = (const SV *)(sv); \
1073 assert(SvTYPE(_svtail) != SVt_PVAV); \
1074 assert(SvTYPE(_svtail) != SVt_PVHV); \
1075 (SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
1076 == (SVpbm_TAIL|SVpbm_VALID); \
1079 # define SvVALID(sv) (SvFLAGS(sv) & SVpbm_VALID)
1080 # define SvVALID_on(sv) (SvFLAGS(sv) |= SVpbm_VALID)
1081 # define SvVALID_off(sv) (SvFLAGS(sv) &= ~SVpbm_VALID)
1082 # define SvTAIL(sv) ((SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
1083 == (SVpbm_TAIL|SVpbm_VALID))
1086 #define SvTAIL_on(sv) (SvFLAGS(sv) |= SVpbm_TAIL)
1087 #define SvTAIL_off(sv) (SvFLAGS(sv) &= ~SVpbm_TAIL)
1090 #define SvPAD_TYPED(sv) \
1091 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_TYPED)) == (SVpad_NAME|SVpad_TYPED))
1093 #define SvPAD_OUR(sv) \
1094 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_OUR)) == (SVpad_NAME|SVpad_OUR))
1096 #define SvPAD_STATE(sv) \
1097 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_STATE)) == (SVpad_NAME|SVpad_STATE))
1099 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1100 # define SvPAD_TYPED_on(sv) ({ \
1101 SV *const _svpad = MUTABLE_SV(sv); \
1102 assert(SvTYPE(_svpad) == SVt_PVMG); \
1103 (SvFLAGS(_svpad) |= SVpad_NAME|SVpad_TYPED); \
1105 #define SvPAD_OUR_on(sv) ({ \
1106 SV *const _svpad = MUTABLE_SV(sv); \
1107 assert(SvTYPE(_svpad) == SVt_PVMG); \
1108 (SvFLAGS(_svpad) |= SVpad_NAME|SVpad_OUR); \
1110 #define SvPAD_STATE_on(sv) ({ \
1111 SV *const _svpad = MUTABLE_SV(sv); \
1112 assert(SvTYPE(_svpad) == SVt_PVNV || SvTYPE(_svpad) == SVt_PVMG); \
1113 (SvFLAGS(_svpad) |= SVpad_NAME|SVpad_STATE); \
1116 # define SvPAD_TYPED_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_TYPED)
1117 # define SvPAD_OUR_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_OUR)
1118 # define SvPAD_STATE_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_STATE)
1121 #define SvOURSTASH(sv) \
1122 (SvPAD_OUR(sv) ? ((XPVMG*) SvANY(sv))->xmg_u.xmg_ourstash : NULL)
1123 #define SvOURSTASH_set(sv, st) \
1125 assert(SvTYPE(sv) == SVt_PVMG); \
1126 ((XPVMG*) SvANY(sv))->xmg_u.xmg_ourstash = st; \
1129 #define SvRVx(sv) SvRV(sv)
1131 #ifdef PERL_DEBUG_COW
1132 /* Need -0.0 for SvNVX to preserve IEEE FP "negative zero" because
1133 +0.0 + -0.0 => +0.0 but -0.0 + -0.0 => -0.0 */
1134 # define SvIVX(sv) (0 + ((XPVIV*) SvANY(sv))->xiv_iv)
1135 # define SvUVX(sv) (0 + ((XPVUV*) SvANY(sv))->xuv_uv)
1136 # define SvNVX(sv) (-0.0 + ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv)
1137 # define SvRV(sv) (0 + (sv)->sv_u.svu_rv)
1138 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1139 /* Don't test the core XS code yet. */
1140 # if defined (PERL_CORE) && PERL_DEBUG_COW > 1
1141 # define SvPVX(sv) (0 + (assert_(!SvREADONLY(sv)) (sv)->sv_u.svu_pv))
1143 # define SvPVX(sv) SvPVX_mutable(sv)
1145 # define SvCUR(sv) (0 + ((XPV*) SvANY(sv))->xpv_cur)
1146 # define SvLEN(sv) (0 + ((XPV*) SvANY(sv))->xpv_len)
1147 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1149 # define SvMAGIC(sv) (0 + *(assert_(SvTYPE(sv) >= SVt_PVMG) &((XPVMG*) SvANY(sv))->xmg_u.xmg_magic))
1150 # define SvSTASH(sv) (0 + *(assert_(SvTYPE(sv) >= SVt_PVMG) &((XPVMG*) SvANY(sv))->xmg_stash))
1152 # define SvLEN(sv) ((XPV*) SvANY(sv))->xpv_len
1153 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1155 # if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1156 /* These get expanded inside other macros that already use a variable _sv */
1157 # define SvPVX(sv) \
1158 (*({ SV *const _svpvx = MUTABLE_SV(sv); \
1159 assert(PL_valid_types_PVX[SvTYPE(_svpvx) & SVt_MASK]); \
1160 assert(!isGV_with_GP(_svpvx)); \
1161 assert(!(SvTYPE(_svpvx) == SVt_PVIO \
1162 && !(IoFLAGS(_svpvx) & IOf_FAKE_DIRP))); \
1163 &((_svpvx)->sv_u.svu_pv); \
1165 # define SvCUR(sv) \
1166 (*({ const SV *const _svcur = (const SV *)(sv); \
1167 assert(PL_valid_types_PVX[SvTYPE(_svcur) & SVt_MASK] \
1168 || SvTYPE(_svcur) == SVt_REGEXP); \
1169 assert(!isGV_with_GP(_svcur)); \
1170 assert(!(SvTYPE(_svcur) == SVt_PVIO \
1171 && !(IoFLAGS(_svcur) & IOf_FAKE_DIRP))); \
1172 &(((XPV*) MUTABLE_PTR(SvANY(_svcur)))->xpv_cur); \
1174 # define SvIVX(sv) \
1175 (*({ const SV *const _svivx = (const SV *)(sv); \
1176 assert(PL_valid_types_IVX[SvTYPE(_svivx) & SVt_MASK]); \
1177 assert(!isGV_with_GP(_svivx)); \
1178 &(((XPVIV*) MUTABLE_PTR(SvANY(_svivx)))->xiv_iv); \
1180 # define SvUVX(sv) \
1181 (*({ const SV *const _svuvx = (const SV *)(sv); \
1182 assert(PL_valid_types_IVX[SvTYPE(_svuvx) & SVt_MASK]); \
1183 assert(!isGV_with_GP(_svuvx)); \
1184 &(((XPVUV*) MUTABLE_PTR(SvANY(_svuvx)))->xuv_uv); \
1186 # define SvNVX(sv) \
1187 (*({ const SV *const _svnvx = (const SV *)(sv); \
1188 assert(PL_valid_types_NVX[SvTYPE(_svnvx) & SVt_MASK]); \
1189 assert(!isGV_with_GP(_svnvx)); \
1190 &(((XPVNV*) MUTABLE_PTR(SvANY(_svnvx)))->xnv_u.xnv_nv); \
1193 (*({ SV *const _svrv = MUTABLE_SV(sv); \
1194 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1195 assert(!isGV_with_GP(_svrv)); \
1196 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1197 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1198 &((_svrv)->sv_u.svu_rv); \
1200 # define SvRV_const(sv) \
1201 ({ const SV *const _svrv = (const SV *)(sv); \
1202 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1203 assert(!isGV_with_GP(_svrv)); \
1204 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1205 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1206 (_svrv)->sv_u.svu_rv; \
1208 # define SvMAGIC(sv) \
1209 (*({ const SV *const _svmagic = (const SV *)(sv); \
1210 assert(SvTYPE(_svmagic) >= SVt_PVMG); \
1211 if(SvTYPE(_svmagic) == SVt_PVMG) \
1212 assert(!SvPAD_OUR(_svmagic)); \
1213 &(((XPVMG*) MUTABLE_PTR(SvANY(_svmagic)))->xmg_u.xmg_magic); \
1215 # define SvSTASH(sv) \
1216 (*({ const SV *const _svstash = (const SV *)(sv); \
1217 assert(SvTYPE(_svstash) >= SVt_PVMG); \
1218 &(((XPVMG*) MUTABLE_PTR(SvANY(_svstash)))->xmg_stash); \
1221 # define SvPVX(sv) ((sv)->sv_u.svu_pv)
1222 # define SvCUR(sv) ((XPV*) SvANY(sv))->xpv_cur
1223 # define SvIVX(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1224 # define SvUVX(sv) ((XPVUV*) SvANY(sv))->xuv_uv
1225 # define SvNVX(sv) ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv
1226 # define SvRV(sv) ((sv)->sv_u.svu_rv)
1227 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1228 # define SvMAGIC(sv) ((XPVMG*) SvANY(sv))->xmg_u.xmg_magic
1229 # define SvSTASH(sv) ((XPVMG*) SvANY(sv))->xmg_stash
1234 /* Given that these two are new, there can't be any existing code using them
1236 # define SvPVX_mutable(sv) (0 + (sv)->sv_u.svu_pv)
1237 # define SvPVX_const(sv) ((const char*)(0 + (sv)->sv_u.svu_pv))
1239 /* Except for the poison code, which uses & to scribble over the pointer after
1240 free() is called. */
1241 # define SvPVX_mutable(sv) ((sv)->sv_u.svu_pv)
1242 # define SvPVX_const(sv) ((const char*)((sv)->sv_u.svu_pv))
1245 #define SvIVXx(sv) SvIVX(sv)
1246 #define SvUVXx(sv) SvUVX(sv)
1247 #define SvNVXx(sv) SvNVX(sv)
1248 #define SvPVXx(sv) SvPVX(sv)
1249 #define SvLENx(sv) SvLEN(sv)
1250 #define SvENDx(sv) ((PL_Sv = (sv)), SvEND(PL_Sv))
1253 /* Ask a scalar nicely to try to become an IV, if possible.
1254 Not guaranteed to stay returning void */
1255 /* Macro won't actually call sv_2iv if already IOK */
1256 #define SvIV_please(sv) \
1257 STMT_START {if (!SvIOKp(sv) && (SvNOK(sv) || SvPOK(sv))) \
1258 (void) SvIV(sv); } STMT_END
1259 #define SvIV_please_nomg(sv) \
1260 (!SvIOKp(sv) && (SvNOK(sv) || SvPOK(sv)) \
1261 ? (SvIV_nomg(sv), SvIOK(sv)) \
1263 #define SvIV_set(sv, val) \
1265 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1266 assert(!isGV_with_GP(sv)); \
1267 (((XPVIV*) SvANY(sv))->xiv_iv = (val)); } STMT_END
1268 #define SvNV_set(sv, val) \
1270 assert(PL_valid_types_NV_set[SvTYPE(sv) & SVt_MASK]); \
1271 assert(!isGV_with_GP(sv)); \
1272 (((XPVNV*)SvANY(sv))->xnv_u.xnv_nv = (val)); } STMT_END
1273 #define SvPV_set(sv, val) \
1275 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1276 assert(!isGV_with_GP(sv)); \
1277 assert(!(SvTYPE(sv) == SVt_PVIO \
1278 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1279 ((sv)->sv_u.svu_pv = (val)); } STMT_END
1280 #define SvUV_set(sv, val) \
1282 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1283 assert(!isGV_with_GP(sv)); \
1284 (((XPVUV*)SvANY(sv))->xuv_uv = (val)); } STMT_END
1285 #define SvRV_set(sv, val) \
1287 assert(PL_valid_types_RV[SvTYPE(sv) & SVt_MASK]); \
1288 assert(!isGV_with_GP(sv)); \
1289 assert(!(SvTYPE(sv) == SVt_PVIO \
1290 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1291 ((sv)->sv_u.svu_rv = (val)); } STMT_END
1292 #define SvMAGIC_set(sv, val) \
1293 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1294 (((XPVMG*)SvANY(sv))->xmg_u.xmg_magic = (val)); } STMT_END
1295 #define SvSTASH_set(sv, val) \
1296 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1297 (((XPVMG*) SvANY(sv))->xmg_stash = (val)); } STMT_END
1298 #define SvCUR_set(sv, val) \
1300 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK] \
1301 || SvTYPE(sv) == SVt_REGEXP); \
1302 assert(!isGV_with_GP(sv)); \
1303 assert(!(SvTYPE(sv) == SVt_PVIO \
1304 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1305 (((XPV*) SvANY(sv))->xpv_cur = (val)); } STMT_END
1306 #define SvLEN_set(sv, val) \
1308 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1309 assert(!isGV_with_GP(sv)); \
1310 assert(!(SvTYPE(sv) == SVt_PVIO \
1311 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1312 (((XPV*) SvANY(sv))->xpv_len = (val)); } STMT_END
1313 #define SvEND_set(sv, val) \
1314 STMT_START { assert(SvTYPE(sv) >= SVt_PV); \
1315 SvCUR_set(sv, (val) - SvPVX(sv)); } STMT_END
1317 #define SvPV_renew(sv,n) \
1318 STMT_START { SvLEN_set(sv, n); \
1319 SvPV_set((sv), (MEM_WRAP_CHECK_(n,char) \
1320 (char*)saferealloc((Malloc_t)SvPVX(sv), \
1321 (MEM_SIZE)((n))))); \
1324 #define SvPV_shrink_to_cur(sv) STMT_START { \
1325 const STRLEN _lEnGtH = SvCUR(sv) + 1; \
1326 SvPV_renew(sv, _lEnGtH); \
1329 #define SvPV_free(sv) \
1331 assert(SvTYPE(sv) >= SVt_PV); \
1333 assert(!SvROK(sv)); \
1336 SvOOK_offset(sv, zok); \
1337 SvPV_set(sv, SvPVX_mutable(sv) - zok); \
1338 SvFLAGS(sv) &= ~SVf_OOK; \
1340 Safefree(SvPVX(sv)); \
1345 /* Code that crops up in three places to take a scalar and ready it to hold
1347 # define prepare_SV_for_RV(sv) \
1349 if (SvTYPE(sv) < SVt_PV && SvTYPE(sv) != SVt_IV) \
1350 sv_upgrade(sv, SVt_IV); \
1351 else if (SvTYPE(sv) >= SVt_PV) { \
1360 # define BmFLAGS(sv) (SvTAIL(sv) ? FBMcf_TAIL : 0)
1363 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1364 # define BmRARE(sv) \
1365 (*({ SV *const _bmrare = MUTABLE_SV(sv); \
1366 assert(SvTYPE(_bmrare) == SVt_PVMG); \
1367 assert(SvVALID(_bmrare)); \
1368 &(((XPVMG*) SvANY(_bmrare))->xnv_u.xbm_s.xbm_rare); \
1370 # define BmUSEFUL(sv) \
1371 (*({ SV *const _bmuseful = MUTABLE_SV(sv); \
1372 assert(SvTYPE(_bmuseful) == SVt_PVMG); \
1373 assert(SvVALID(_bmuseful)); \
1374 assert(!SvIOK(_bmuseful)); \
1375 &(((XPVMG*) SvANY(_bmuseful))->xnv_u.xbm_s.xbm_useful); \
1377 # define BmPREVIOUS(sv) \
1378 (*({ SV *const _bmprevious = MUTABLE_SV(sv); \
1379 assert(SvTYPE(_bmprevious) == SVt_PVMG); \
1380 assert(SvVALID(_bmprevious)); \
1381 &(((XPVMG*) SvANY(_bmprevious))->xiv_u.xivu_uv); \
1384 # define BmRARE(sv) ((XPVMG*) SvANY(sv))->xnv_u.xbm_s.xbm_rare
1385 # define BmUSEFUL(sv) ((XPVMG*) SvANY(sv))->xnv_u.xbm_s.xbm_useful
1386 # define BmPREVIOUS(sv) ((XPVMG*) SvANY(sv))->xiv_u.xivu_uv
1390 #define FmLINES(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1392 #define LvTYPE(sv) ((XPVLV*) SvANY(sv))->xlv_type
1393 #define LvTARG(sv) ((XPVLV*) SvANY(sv))->xlv_targ
1394 #define LvTARGOFF(sv) ((XPVLV*) SvANY(sv))->xlv_targoff
1395 #define LvTARGLEN(sv) ((XPVLV*) SvANY(sv))->xlv_targlen
1396 #define LvFLAGS(sv) ((XPVLV*) SvANY(sv))->xlv_flags
1398 #define IoIFP(sv) (sv)->sv_u.svu_fp
1399 #define IoOFP(sv) ((XPVIO*) SvANY(sv))->xio_ofp
1400 #define IoDIRP(sv) ((XPVIO*) SvANY(sv))->xio_dirp
1401 #define IoANY(sv) ((XPVIO*) SvANY(sv))->xio_any
1402 #define IoLINES(sv) ((XPVIO*) SvANY(sv))->xiv_u.xivu_iv
1403 #define IoPAGE(sv) ((XPVIO*) SvANY(sv))->xio_page
1404 #define IoPAGE_LEN(sv) ((XPVIO*) SvANY(sv))->xio_page_len
1405 #define IoLINES_LEFT(sv)((XPVIO*) SvANY(sv))->xio_lines_left
1406 #define IoTOP_NAME(sv) ((XPVIO*) SvANY(sv))->xio_top_name
1407 #define IoTOP_GV(sv) ((XPVIO*) SvANY(sv))->xio_top_gv
1408 #define IoFMT_NAME(sv) ((XPVIO*) SvANY(sv))->xio_fmt_name
1409 #define IoFMT_GV(sv) ((XPVIO*) SvANY(sv))->xio_fmt_gv
1410 #define IoBOTTOM_NAME(sv)((XPVIO*) SvANY(sv))->xio_bottom_name
1411 #define IoBOTTOM_GV(sv) ((XPVIO*) SvANY(sv))->xio_bottom_gv
1412 #define IoTYPE(sv) ((XPVIO*) SvANY(sv))->xio_type
1413 #define IoFLAGS(sv) ((XPVIO*) SvANY(sv))->xio_flags
1415 /* IoTYPE(sv) is a single character telling the type of I/O connection. */
1416 #define IoTYPE_RDONLY '<'
1417 #define IoTYPE_WRONLY '>'
1418 #define IoTYPE_RDWR '+'
1419 #define IoTYPE_APPEND 'a'
1420 #define IoTYPE_PIPE '|'
1421 #define IoTYPE_STD '-' /* stdin or stdout */
1422 #define IoTYPE_SOCKET 's'
1423 #define IoTYPE_CLOSED ' '
1424 #define IoTYPE_IMPLICIT 'I' /* stdin or stdout or stderr */
1425 #define IoTYPE_NUMERIC '#' /* fdopen */
1428 =for apidoc Am|bool|SvTAINTED|SV* sv
1429 Checks to see if an SV is tainted. Returns TRUE if it is, FALSE if
1432 =for apidoc Am|void|SvTAINTED_on|SV* sv
1433 Marks an SV as tainted if tainting is enabled.
1435 =for apidoc Am|void|SvTAINTED_off|SV* sv
1436 Untaints an SV. Be I<very> careful with this routine, as it short-circuits
1437 some of Perl's fundamental security features. XS module authors should not
1438 use this function unless they fully understand all the implications of
1439 unconditionally untainting the value. Untainting should be done in the
1440 standard perl fashion, via a carefully crafted regexp, rather than directly
1441 untainting variables.
1443 =for apidoc Am|void|SvTAINT|SV* sv
1444 Taints an SV if tainting is enabled, and if some input to the current
1445 expression is tainted--usually a variable, but possibly also implicit
1446 inputs such as locale settings. C<SvTAINT> propagates that taintedness to
1447 the outputs of an expression in a pessimistic fashion; i.e., without paying
1448 attention to precisely which outputs are influenced by which inputs.
1453 #define sv_taint(sv) sv_magic((sv), NULL, PERL_MAGIC_taint, NULL, 0)
1455 #if NO_TAINT_SUPPORT
1456 # define SvTAINTED(sv) 0
1458 # define SvTAINTED(sv) (SvMAGICAL(sv) && sv_tainted(sv))
1460 #define SvTAINTED_on(sv) STMT_START{ if(TAINTING_get){sv_taint(sv);} }STMT_END
1461 #define SvTAINTED_off(sv) STMT_START{ if(TAINTING_get){sv_untaint(sv);} }STMT_END
1463 #define SvTAINT(sv) \
1465 if (TAINTING_get) { \
1472 =for apidoc Am|char*|SvPV_force|SV* sv|STRLEN len
1473 Like C<SvPV> but will force the SV into containing a string (C<SvPOK>), and
1474 only a string (C<SvPOK_only>), by hook or by crook. You want force if you are
1475 going to update the C<SvPVX> directly. Processes get magic.
1477 =for apidoc Am|char*|SvPV_force_nomg|SV* sv|STRLEN len
1478 Like C<SvPV> but will force the SV into containing a string (C<SvPOK>), and
1479 only a string (C<SvPOK_only>), by hook or by crook. You want force if you are
1480 going to update the C<SvPVX> directly. Doesn't process get magic.
1482 =for apidoc Am|char*|SvPV|SV* sv|STRLEN len
1483 Returns a pointer to the string in the SV, or a stringified form of
1484 the SV if the SV does not contain a string. The SV may cache the
1485 stringified version becoming C<SvPOK>. Handles 'get' magic. See also
1486 C<SvPVx> for a version which guarantees to evaluate sv only once.
1488 =for apidoc Am|char*|SvPVx|SV* sv|STRLEN len
1489 A version of C<SvPV> which guarantees to evaluate C<sv> only once.
1490 Only use this if C<sv> is an expression with side effects, otherwise use the
1491 more efficient C<SvPV>.
1493 =for apidoc Am|char*|SvPV_nomg|SV* sv|STRLEN len
1494 Like C<SvPV> but doesn't process magic.
1496 =for apidoc Am|char*|SvPV_nolen|SV* sv
1497 Returns a pointer to the string in the SV, or a stringified form of
1498 the SV if the SV does not contain a string. The SV may cache the
1499 stringified form becoming C<SvPOK>. Handles 'get' magic.
1501 =for apidoc Am|char*|SvPV_nomg_nolen|SV* sv
1502 Like C<SvPV_nolen> but doesn't process magic.
1504 =for apidoc Am|IV|SvIV|SV* sv
1505 Coerces the given SV to an integer and returns it. See C<SvIVx> for a
1506 version which guarantees to evaluate sv only once.
1508 =for apidoc Am|IV|SvIV_nomg|SV* sv
1509 Like C<SvIV> but doesn't process magic.
1511 =for apidoc Am|IV|SvIVx|SV* sv
1512 Coerces the given SV to an integer and returns it.
1513 Guarantees to evaluate C<sv> only once. Only use
1514 this if C<sv> is an expression with side effects,
1515 otherwise use the more efficient C<SvIV>.
1517 =for apidoc Am|NV|SvNV|SV* sv
1518 Coerce the given SV to a double and return it. See C<SvNVx> for a version
1519 which guarantees to evaluate sv only once.
1521 =for apidoc Am|NV|SvNV_nomg|SV* sv
1522 Like C<SvNV> but doesn't process magic.
1524 =for apidoc Am|NV|SvNVx|SV* sv
1525 Coerces the given SV to a double and returns it.
1526 Guarantees to evaluate C<sv> only once. Only use
1527 this if C<sv> is an expression with side effects,
1528 otherwise use the more efficient C<SvNV>.
1530 =for apidoc Am|UV|SvUV|SV* sv
1531 Coerces the given SV to an unsigned integer and returns it. See C<SvUVx>
1532 for a version which guarantees to evaluate sv only once.
1534 =for apidoc Am|UV|SvUV_nomg|SV* sv
1535 Like C<SvUV> but doesn't process magic.
1537 =for apidoc Am|UV|SvUVx|SV* sv
1538 Coerces the given SV to an unsigned integer and
1539 returns it. Guarantees to evaluate C<sv> only once. Only
1540 use this if C<sv> is an expression with side effects,
1541 otherwise use the more efficient C<SvUV>.
1543 =for apidoc Am|bool|SvTRUE|SV* sv
1544 Returns a boolean indicating whether Perl would evaluate the SV as true or
1545 false. See SvOK() for a defined/undefined test. Handles 'get' magic
1546 unless the scalar is already SvPOK, SvIOK or SvNOK (the public, not the
1549 =for apidoc Am|bool|SvTRUE_nomg|SV* sv
1550 Returns a boolean indicating whether Perl would evaluate the SV as true or
1551 false. See SvOK() for a defined/undefined test. Does not handle 'get' magic.
1553 =for apidoc Am|char*|SvPVutf8_force|SV* sv|STRLEN len
1554 Like C<SvPV_force>, but converts sv to utf8 first if necessary.
1556 =for apidoc Am|char*|SvPVutf8|SV* sv|STRLEN len
1557 Like C<SvPV>, but converts sv to utf8 first if necessary.
1559 =for apidoc Am|char*|SvPVutf8_nolen|SV* sv
1560 Like C<SvPV_nolen>, but converts sv to utf8 first if necessary.
1562 =for apidoc Am|char*|SvPVbyte_force|SV* sv|STRLEN len
1563 Like C<SvPV_force>, but converts sv to byte representation first if necessary.
1565 =for apidoc Am|char*|SvPVbyte|SV* sv|STRLEN len
1566 Like C<SvPV>, but converts sv to byte representation first if necessary.
1568 =for apidoc Am|char*|SvPVbyte_nolen|SV* sv
1569 Like C<SvPV_nolen>, but converts sv to byte representation first if necessary.
1571 =for apidoc Am|char*|SvPVutf8x_force|SV* sv|STRLEN len
1572 Like C<SvPV_force>, but converts sv to utf8 first if necessary.
1573 Guarantees to evaluate sv only once; use the more efficient C<SvPVutf8_force>
1576 =for apidoc Am|char*|SvPVutf8x|SV* sv|STRLEN len
1577 Like C<SvPV>, but converts sv to utf8 first if necessary.
1578 Guarantees to evaluate sv only once; use the more efficient C<SvPVutf8>
1581 =for apidoc Am|char*|SvPVbytex_force|SV* sv|STRLEN len
1582 Like C<SvPV_force>, but converts sv to byte representation first if necessary.
1583 Guarantees to evaluate sv only once; use the more efficient C<SvPVbyte_force>
1586 =for apidoc Am|char*|SvPVbytex|SV* sv|STRLEN len
1587 Like C<SvPV>, but converts sv to byte representation first if necessary.
1588 Guarantees to evaluate sv only once; use the more efficient C<SvPVbyte>
1591 =for apidoc Am|bool|SvIsCOW|SV* sv
1592 Returns a boolean indicating whether the SV is Copy-On-Write (either shared
1593 hash key scalars, or full Copy On Write scalars if 5.9.0 is configured for
1596 =for apidoc Am|bool|SvIsCOW_shared_hash|SV* sv
1597 Returns a boolean indicating whether the SV is Copy-On-Write shared hash key
1600 =for apidoc Am|void|sv_catpvn_nomg|SV* sv|const char* ptr|STRLEN len
1601 Like C<sv_catpvn> but doesn't process magic.
1603 =for apidoc Am|void|sv_catpv_nomg|SV* sv|const char* ptr
1604 Like C<sv_catpv> but doesn't process magic.
1606 =for apidoc Am|void|sv_setsv_nomg|SV* dsv|SV* ssv
1607 Like C<sv_setsv> but doesn't process magic.
1609 =for apidoc Am|void|sv_catsv_nomg|SV* dsv|SV* ssv
1610 Like C<sv_catsv> but doesn't process magic.
1612 =for apidoc Amdb|STRLEN|sv_utf8_upgrade_nomg|NN SV *sv
1614 Like sv_utf8_upgrade, but doesn't do magic on C<sv>.
1619 /* Let us hope that bitmaps for UV and IV are the same */
1620 #define SvIV(sv) (SvIOK_nog(sv) ? SvIVX(sv) : sv_2iv(sv))
1621 #define SvUV(sv) (SvUOK_nog(sv) ? SvUVX(sv) : sv_2uv(sv))
1622 #define SvNV(sv) (SvNOK_nog(sv) ? SvNVX(sv) : sv_2nv(sv))
1624 #define SvIV_nomg(sv) (SvIOK(sv) ? SvIVX(sv) : sv_2iv_flags(sv, 0))
1625 #define SvUV_nomg(sv) (SvIOK(sv) ? SvUVX(sv) : sv_2uv_flags(sv, 0))
1626 #define SvNV_nomg(sv) (SvNOK(sv) ? SvNVX(sv) : sv_2nv_flags(sv, 0))
1630 #define SvPV(sv, lp) SvPV_flags(sv, lp, SV_GMAGIC)
1631 #define SvPV_const(sv, lp) SvPV_flags_const(sv, lp, SV_GMAGIC)
1632 #define SvPV_mutable(sv, lp) SvPV_flags_mutable(sv, lp, SV_GMAGIC)
1634 #define SvPV_flags(sv, lp, flags) \
1636 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pv_flags(sv, &lp, flags))
1637 #define SvPV_flags_const(sv, lp, flags) \
1639 ? ((lp = SvCUR(sv)), SvPVX_const(sv)) : \
1640 (const char*) sv_2pv_flags(sv, &lp, flags|SV_CONST_RETURN))
1641 #define SvPV_flags_const_nolen(sv, flags) \
1643 ? SvPVX_const(sv) : \
1644 (const char*) sv_2pv_flags(sv, 0, flags|SV_CONST_RETURN))
1645 #define SvPV_flags_mutable(sv, lp, flags) \
1647 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) : \
1648 sv_2pv_flags(sv, &lp, flags|SV_MUTABLE_RETURN))
1650 #define SvPV_force(sv, lp) SvPV_force_flags(sv, lp, SV_GMAGIC)
1651 #define SvPV_force_nolen(sv) SvPV_force_flags_nolen(sv, SV_GMAGIC)
1652 #define SvPV_force_mutable(sv, lp) SvPV_force_flags_mutable(sv, lp, SV_GMAGIC)
1654 #define SvPV_force_nomg(sv, lp) SvPV_force_flags(sv, lp, 0)
1655 #define SvPV_force_nomg_nolen(sv) SvPV_force_flags_nolen(sv, 0)
1657 #define SvPV_force_flags(sv, lp, flags) \
1658 (SvPOK_pure_nogthink(sv) \
1659 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvn_force_flags(sv, &lp, flags))
1661 #define SvPV_force_flags_nolen(sv, flags) \
1662 (SvPOK_pure_nogthink(sv) \
1663 ? SvPVX(sv) : sv_pvn_force_flags(sv, 0, flags))
1665 #define SvPV_force_flags_mutable(sv, lp, flags) \
1666 (SvPOK_pure_nogthink(sv) \
1667 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) \
1668 : sv_pvn_force_flags(sv, &lp, flags|SV_MUTABLE_RETURN))
1670 #define SvPV_nolen(sv) \
1672 ? SvPVX(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC))
1674 #define SvPV_nomg_nolen(sv) \
1676 ? SvPVX(sv) : sv_2pv_flags(sv, 0, 0))
1678 #define SvPV_nolen_const(sv) \
1680 ? SvPVX_const(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC|SV_CONST_RETURN))
1682 #define SvPV_nomg(sv, lp) SvPV_flags(sv, lp, 0)
1683 #define SvPV_nomg_const(sv, lp) SvPV_flags_const(sv, lp, 0)
1684 #define SvPV_nomg_const_nolen(sv) SvPV_flags_const_nolen(sv, 0)
1688 #define SvPVutf8(sv, lp) \
1689 (SvPOK_utf8_nog(sv) \
1690 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvutf8(sv, &lp))
1692 #define SvPVutf8_force(sv, lp) \
1693 (SvPOK_utf8_pure_nogthink(sv) \
1694 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvutf8n_force(sv, &lp))
1696 #define SvPVutf8_nolen(sv) \
1697 (SvPOK_utf8_nog(sv) \
1698 ? SvPVX(sv) : sv_2pvutf8(sv, 0))
1702 #define SvPVbyte(sv, lp) \
1703 (SvPOK_byte_nog(sv) \
1704 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvbyte(sv, &lp))
1706 #define SvPVbyte_force(sv, lp) \
1707 (SvPOK_byte_pure_nogthink(sv) \
1708 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvbyten_force(sv, &lp))
1710 #define SvPVbyte_nolen(sv) \
1711 (SvPOK_byte_nog(sv) \
1712 ? SvPVX(sv) : sv_2pvbyte(sv, 0))
1715 /* define FOOx(): idempotent versions of FOO(). If possible, use a local
1716 * var to evaluate the arg once; failing that, use a global if possible;
1717 * failing that, call a function to do the work
1720 #define SvPVx_force(sv, lp) sv_pvn_force(sv, &lp)
1721 #define SvPVutf8x_force(sv, lp) sv_pvutf8n_force(sv, &lp)
1722 #define SvPVbytex_force(sv, lp) sv_pvbyten_force(sv, &lp)
1724 #define SvTRUE(sv) ((sv) && (SvGMAGICAL(sv) ? sv_2bool(sv) : SvTRUE_common(sv, sv_2bool_nomg(sv))))
1725 #define SvTRUE_nomg(sv) ((sv) && ( SvTRUE_common(sv, sv_2bool_nomg(sv))))
1726 #define SvTRUE_NN(sv) (SvGMAGICAL(sv) ? sv_2bool(sv) : SvTRUE_common(sv, sv_2bool_nomg(sv)))
1727 #define SvTRUE_nomg_NN(sv) ( SvTRUE_common(sv, sv_2bool_nomg(sv)))
1728 #define SvTRUE_common(sv,fallback) ( \
1731 : (SvFLAGS(sv) & (SVf_POK|SVf_IOK|SVf_NOK)) \
1732 ? ( (SvPOK(sv) && SvPVXtrue(sv)) \
1733 || (SvIOK(sv) && SvIVX(sv) != 0) \
1734 || (SvNOK(sv) && SvNVX(sv) != 0.0)) \
1737 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1739 # define SvIVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvIV(_sv); })
1740 # define SvUVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvUV(_sv); })
1741 # define SvNVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvNV(_sv); })
1742 # define SvPVx(sv, lp) ({SV *_sv = (sv); SvPV(_sv, lp); })
1743 # define SvPVx_const(sv, lp) ({SV *_sv = (sv); SvPV_const(_sv, lp); })
1744 # define SvPVx_nolen(sv) ({SV *_sv = (sv); SvPV_nolen(_sv); })
1745 # define SvPVx_nolen_const(sv) ({SV *_sv = (sv); SvPV_nolen_const(_sv); })
1746 # define SvPVutf8x(sv, lp) ({SV *_sv = (sv); SvPVutf8(_sv, lp); })
1747 # define SvPVbytex(sv, lp) ({SV *_sv = (sv); SvPVbyte(_sv, lp); })
1748 # define SvPVbytex_nolen(sv) ({SV *_sv = (sv); SvPVbyte_nolen(_sv); })
1749 # define SvTRUEx(sv) ({SV *_sv = (sv); SvTRUE(_sv); })
1750 # define SvTRUEx_nomg(sv) ({SV *_sv = (sv); SvTRUE_nomg(_sv); })
1752 #else /* __GNUC__ */
1754 /* These inlined macros use globals, which will require a thread
1755 * declaration in user code, so we avoid them under threads */
1757 # define SvIVx(sv) ((PL_Sv = (sv)), SvIV(PL_Sv))
1758 # define SvUVx(sv) ((PL_Sv = (sv)), SvUV(PL_Sv))
1759 # define SvNVx(sv) ((PL_Sv = (sv)), SvNV(PL_Sv))
1760 # define SvPVx(sv, lp) ((PL_Sv = (sv)), SvPV(PL_Sv, lp))
1761 # define SvPVx_const(sv, lp) ((PL_Sv = (sv)), SvPV_const(PL_Sv, lp))
1762 # define SvPVx_nolen(sv) ((PL_Sv = (sv)), SvPV_nolen(PL_Sv))
1763 # define SvPVx_nolen_const(sv) ((PL_Sv = (sv)), SvPV_nolen_const(PL_Sv))
1764 # define SvPVutf8x(sv, lp) ((PL_Sv = (sv)), SvPVutf8(PL_Sv, lp))
1765 # define SvPVbytex(sv, lp) ((PL_Sv = (sv)), SvPVbyte(PL_Sv, lp))
1766 # define SvPVbytex_nolen(sv) ((PL_Sv = (sv)), SvPVbyte_nolen(PL_Sv))
1767 # define SvTRUEx(sv) ((PL_Sv = (sv)), SvTRUE(PL_Sv))
1768 # define SvTRUEx_nomg(sv) ((PL_Sv = (sv)), SvTRUE_nomg(PL_Sv))
1769 #endif /* __GNU__ */
1771 #define SvPVXtrue(sv) ( \
1772 ((XPV*)SvANY((sv))) \
1774 ((XPV*)SvANY((sv)))->xpv_cur > 1 \
1776 ((XPV*)SvANY((sv)))->xpv_cur \
1777 && *(sv)->sv_u.svu_pv != '0' \
1782 #define SvIsCOW(sv) (SvFLAGS(sv) & SVf_IsCOW)
1783 #define SvIsCOW_on(sv) (SvFLAGS(sv) |= SVf_IsCOW)
1784 #define SvIsCOW_off(sv) (SvFLAGS(sv) &= ~SVf_IsCOW)
1785 #define SvIsCOW_shared_hash(sv) (SvIsCOW(sv) && SvLEN(sv) == 0)
1787 #define SvSHARED_HEK_FROM_PV(pvx) \
1788 ((struct hek*)(pvx - STRUCT_OFFSET(struct hek, hek_key)))
1789 #define SvSHARED_HASH(sv) (0 + SvSHARED_HEK_FROM_PV(SvPVX_const(sv))->hek_hash)
1791 /* flag values for sv_*_flags functions */
1792 #define SV_IMMEDIATE_UNREF 1
1794 #define SV_COW_DROP_PV 4
1795 #define SV_UTF8_NO_ENCODING 8
1796 #define SV_NOSTEAL 16
1797 #define SV_CONST_RETURN 32
1798 #define SV_MUTABLE_RETURN 64
1799 #define SV_SMAGIC 128
1800 #define SV_HAS_TRAILING_NUL 256
1801 #define SV_COW_SHARED_HASH_KEYS 512
1802 /* This one is only enabled for PERL_OLD_COPY_ON_WRITE */
1803 #define SV_COW_OTHER_PVS 1024
1804 /* Make sv_2pv_flags return NULL if something is undefined. */
1805 #define SV_UNDEF_RETURNS_NULL 2048
1806 /* Tell sv_utf8_upgrade() to not check to see if an upgrade is really needed.
1807 * This is used when the caller has already determined it is, and avoids
1809 #define SV_FORCE_UTF8_UPGRADE 4096
1810 /* if (after resolving magic etc), the SV is found to be overloaded,
1811 * don't call the overload magic, just return as-is */
1812 #define SV_SKIP_OVERLOAD 8192
1813 /* It is not yet clear whether we want this as an API, or what the
1814 * constants should be named. */
1816 # define SV_CATBYTES 16384
1817 # define SV_CATUTF8 32768
1820 /* The core is safe for this COW optimisation. XS code on CPAN may not be.
1821 So only default to doing the COW setup if we're in the core.
1824 # ifndef SV_DO_COW_SVSETSV
1825 # define SV_DO_COW_SVSETSV SV_COW_SHARED_HASH_KEYS|SV_COW_OTHER_PVS
1829 #ifndef SV_DO_COW_SVSETSV
1830 # define SV_DO_COW_SVSETSV 0
1834 #define sv_unref(sv) sv_unref_flags(sv, 0)
1835 #define sv_force_normal(sv) sv_force_normal_flags(sv, 0)
1836 #define sv_usepvn(sv, p, l) sv_usepvn_flags(sv, p, l, 0)
1837 #define sv_usepvn_mg(sv, p, l) sv_usepvn_flags(sv, p, l, SV_SMAGIC)
1839 /* We are about to replace the SV's current value. So if it's copy on write
1840 we need to normalise it. Use the SV_COW_DROP_PV flag hint to say that
1841 the value is about to get thrown away, so drop the PV rather than go to
1842 the effort of making a read-write copy only for it to get immediately
1845 #define SV_CHECK_THINKFIRST_COW_DROP(sv) if (SvTHINKFIRST(sv)) \
1846 sv_force_normal_flags(sv, SV_COW_DROP_PV)
1848 #ifdef PERL_OLD_COPY_ON_WRITE
1849 #define SvRELEASE_IVX(sv) \
1850 ((SvIsCOW(sv) ? sv_force_normal_flags(sv, 0) : (void) 0), 0)
1851 # define SvIsCOW_normal(sv) (SvIsCOW(sv) && SvLEN(sv))
1852 # define SvRELEASE_IVX_(sv) SvRELEASE_IVX(sv),
1853 # define SvCANCOW(sv) \
1854 (SvIsCOW(sv) || (SvFLAGS(sv) & CAN_COW_MASK) == CAN_COW_FLAGS)
1855 /* This is a pessimistic view. Scalar must be purely a read-write PV to copy-
1857 # define CAN_COW_MASK (SVs_OBJECT|SVs_GMG|SVs_SMG|SVs_RMG|SVf_IOK|SVf_NOK| \
1858 SVf_POK|SVf_ROK|SVp_IOK|SVp_NOK|SVp_POK|SVf_FAKE| \
1859 SVf_OOK|SVf_BREAK|SVf_READONLY)
1861 # define SvRELEASE_IVX(sv) 0
1862 /* This little game brought to you by the need to shut this warning up:
1863 mg.c: In function 'Perl_magic_get':
1864 mg.c:1024: warning: left-hand operand of comma expression has no effect
1866 # define SvRELEASE_IVX_(sv) /**/
1867 # ifdef PERL_NEW_COPY_ON_WRITE
1868 # define SvCANCOW(sv) \
1870 ? SvLEN(sv) ? CowREFCNT(sv) != SV_COW_REFCNT_MAX : 1 \
1871 : (SvFLAGS(sv) & CAN_COW_MASK) == CAN_COW_FLAGS \
1872 && SvCUR(sv)+1 < SvLEN(sv))
1873 /* Note: To allow 256 COW "copies", a refcnt of 0 means 1. */
1874 # define CowREFCNT(sv) (*(U8 *)(SvPVX(sv)+SvLEN(sv)-1))
1875 # define SV_COW_REFCNT_MAX ((1 << sizeof(U8)*8) - 1)
1876 # ifndef SV_COW_THRESHOLD
1877 # define SV_COW_THRESHOLD 0 /* min string length for cow */
1879 # ifndef SV_COWBUF_THRESHOLD
1880 # define SV_COWBUF_THRESHOLD 1250 /* min string length for cow */
1881 # endif /* over existing buffer */
1882 # define CAN_COW_MASK (SVf_POK|SVf_ROK|SVp_POK|SVf_FAKE| \
1883 SVf_OOK|SVf_BREAK|SVf_READONLY)
1885 #endif /* PERL_OLD_COPY_ON_WRITE */
1887 #define CAN_COW_FLAGS (SVp_POK|SVf_POK)
1889 #define SV_CHECK_THINKFIRST(sv) if (SvTHINKFIRST(sv)) \
1890 sv_force_normal_flags(sv, 0)
1893 /* all these 'functions' are now just macros */
1895 #define sv_pv(sv) SvPV_nolen(sv)
1896 #define sv_pvutf8(sv) SvPVutf8_nolen(sv)
1897 #define sv_pvbyte(sv) SvPVbyte_nolen(sv)
1899 #define sv_pvn_force_nomg(sv, lp) sv_pvn_force_flags(sv, lp, 0)
1900 #define sv_utf8_upgrade_flags(sv, flags) sv_utf8_upgrade_flags_grow(sv, flags, 0)
1901 #define sv_utf8_upgrade_nomg(sv) sv_utf8_upgrade_flags(sv, 0)
1902 #define sv_catpvn_nomg(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, 0)
1903 #define sv_catpv_nomg(dsv, sstr) sv_catpv_flags(dsv, sstr, 0)
1904 #define sv_setsv(dsv, ssv) \
1905 sv_setsv_flags(dsv, ssv, SV_GMAGIC|SV_DO_COW_SVSETSV)
1906 #define sv_setsv_nomg(dsv, ssv) sv_setsv_flags(dsv, ssv, SV_DO_COW_SVSETSV)
1907 #define sv_catsv(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC)
1908 #define sv_catsv_nomg(dsv, ssv) sv_catsv_flags(dsv, ssv, 0)
1909 #define sv_catsv_mg(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC|SV_SMAGIC)
1910 #define sv_catpvn(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, SV_GMAGIC)
1911 #define sv_catpvn_mg(sv, sstr, slen) sv_catpvn_flags(sv, sstr, slen, SV_GMAGIC|SV_SMAGIC);
1912 #define sv_copypv(dsv, ssv) sv_copypv_flags(dsv, ssv, SV_GMAGIC)
1913 #define sv_copypv_nomg(dsv, ssv) sv_copypv_flags(dsv, ssv, 0)
1914 #define sv_2pv(sv, lp) sv_2pv_flags(sv, lp, SV_GMAGIC)
1915 #define sv_2pv_nolen(sv) sv_2pv(sv, 0)
1916 #define sv_2pvbyte_nolen(sv) sv_2pvbyte(sv, 0)
1917 #define sv_2pvutf8_nolen(sv) sv_2pvutf8(sv, 0)
1918 #define sv_2pv_nomg(sv, lp) sv_2pv_flags(sv, lp, 0)
1919 #define sv_pvn_force(sv, lp) sv_pvn_force_flags(sv, lp, SV_GMAGIC)
1920 #define sv_utf8_upgrade(sv) sv_utf8_upgrade_flags(sv, SV_GMAGIC)
1921 #define sv_2iv(sv) sv_2iv_flags(sv, SV_GMAGIC)
1922 #define sv_2uv(sv) sv_2uv_flags(sv, SV_GMAGIC)
1923 #define sv_2nv(sv) sv_2nv_flags(sv, SV_GMAGIC)
1924 #define sv_eq(sv1, sv2) sv_eq_flags(sv1, sv2, SV_GMAGIC)
1925 #define sv_cmp(sv1, sv2) sv_cmp_flags(sv1, sv2, SV_GMAGIC)
1926 #define sv_cmp_locale(sv1, sv2) sv_cmp_locale_flags(sv1, sv2, SV_GMAGIC)
1927 #define sv_collxfrm(sv, nxp) sv_cmp_flags(sv, nxp, SV_GMAGIC)
1928 #define sv_2bool(sv) sv_2bool_flags(sv, SV_GMAGIC)
1929 #define sv_2bool_nomg(sv) sv_2bool_flags(sv, 0)
1930 #define sv_insert(bigstr, offset, len, little, littlelen) \
1931 Perl_sv_insert_flags(aTHX_ (bigstr),(offset), (len), (little), \
1932 (littlelen), SV_GMAGIC)
1933 #define sv_mortalcopy(sv) \
1934 Perl_sv_mortalcopy_flags(aTHX_ sv, SV_GMAGIC|SV_DO_COW_SVSETSV)
1936 /* Should be named SvCatPVN_utf8_upgrade? */
1937 #define sv_catpvn_nomg_utf8_upgrade(dsv, sstr, slen, nsv) \
1940 nsv = newSVpvn_flags(sstr, slen, SVs_TEMP); \
1942 sv_setpvn(nsv, sstr, slen); \
1944 sv_utf8_upgrade(nsv); \
1945 sv_catsv_nomg(dsv, nsv); \
1947 #define sv_catpvn_nomg_maybeutf8(dsv, sstr, slen, is_utf8) \
1948 sv_catpvn_flags(dsv, sstr, slen, (is_utf8)?SV_CATUTF8:SV_CATBYTES)
1951 # define sv_or_pv_len_utf8(sv, pv, bytelen) \
1953 ? utf8_length((U8 *)(pv), (U8 *)(pv)+(bytelen)) \
1955 # define sv_or_pv_pos_u2b(sv,s,p,lp) S_sv_or_pv_pos_u2b(aTHX_ sv,s,p,lp)
1959 =for apidoc Am|SV*|newRV_inc|SV* sv
1961 Creates an RV wrapper for an SV. The reference count for the original SV is
1967 #define newRV_inc(sv) newRV(sv)
1969 /* the following macros update any magic values this sv is associated with */
1972 =head1 Magical Functions
1974 =for apidoc Am|void|SvGETMAGIC|SV* sv
1975 Invokes C<mg_get> on an SV if it has 'get' magic. For example, this
1976 will call C<FETCH> on a tied variable. This macro evaluates its
1977 argument more than once.
1979 =for apidoc Am|void|SvSETMAGIC|SV* sv
1980 Invokes C<mg_set> on an SV if it has 'set' magic. This is necessary
1981 after modifying a scalar, in case it is a magical variable like C<$|>
1982 or a tied variable (it calls C<STORE>). This macro evaluates its
1983 argument more than once.
1985 =for apidoc Am|void|SvSetSV|SV* dsb|SV* ssv
1986 Calls C<sv_setsv> if dsv is not the same as ssv. May evaluate arguments
1989 =for apidoc Am|void|SvSetSV_nosteal|SV* dsv|SV* ssv
1990 Calls a non-destructive version of C<sv_setsv> if dsv is not the same as
1991 ssv. May evaluate arguments more than once.
1993 =for apidoc Am|void|SvSetMagicSV|SV* dsb|SV* ssv
1994 Like C<SvSetSV>, but does any set magic required afterwards.
1996 =for apidoc Am|void|SvSetMagicSV_nosteal|SV* dsv|SV* ssv
1997 Like C<SvSetSV_nosteal>, but does any set magic required afterwards.
1999 =for apidoc Am|void|SvSHARE|SV* sv
2000 Arranges for sv to be shared between threads if a suitable module
2003 =for apidoc Am|void|SvLOCK|SV* sv
2004 Arranges for a mutual exclusion lock to be obtained on sv if a suitable module
2007 =for apidoc Am|void|SvUNLOCK|SV* sv
2008 Releases a mutual exclusion lock on sv if a suitable module
2011 =head1 SV Manipulation Functions
2013 =for apidoc Am|char *|SvGROW|SV* sv|STRLEN len
2014 Expands the character buffer in the SV so that it has room for the
2015 indicated number of bytes (remember to reserve space for an extra trailing
2016 NUL character). Calls C<sv_grow> to perform the expansion if necessary.
2017 Returns a pointer to the character buffer. SV must be of type >= SVt_PV. One
2018 alternative is to call C<sv_grow> if you are not sure of the type of SV.
2023 #define SvSHARE(sv) PL_sharehook(aTHX_ sv)
2024 #define SvLOCK(sv) PL_lockhook(aTHX_ sv)
2025 #define SvUNLOCK(sv) PL_unlockhook(aTHX_ sv)
2026 #define SvDESTROYABLE(sv) PL_destroyhook(aTHX_ sv)
2028 #define SvGETMAGIC(x) ((void)(SvGMAGICAL(x) && mg_get(x)))
2029 #define SvSETMAGIC(x) STMT_START { if (SvSMAGICAL(x)) mg_set(x); } STMT_END
2031 #define SvSetSV_and(dst,src,finally) \
2033 if ((dst) != (src)) { \
2034 sv_setsv(dst, src); \
2038 #define SvSetSV_nosteal_and(dst,src,finally) \
2040 if ((dst) != (src)) { \
2041 sv_setsv_flags(dst, src, SV_GMAGIC | SV_NOSTEAL | SV_DO_COW_SVSETSV); \
2046 #define SvSetSV(dst,src) \
2047 SvSetSV_and(dst,src,/*nothing*/;)
2048 #define SvSetSV_nosteal(dst,src) \
2049 SvSetSV_nosteal_and(dst,src,/*nothing*/;)
2051 #define SvSetMagicSV(dst,src) \
2052 SvSetSV_and(dst,src,SvSETMAGIC(dst))
2053 #define SvSetMagicSV_nosteal(dst,src) \
2054 SvSetSV_nosteal_and(dst,src,SvSETMAGIC(dst))
2057 #if !defined(SKIP_DEBUGGING)
2058 #define SvPEEK(sv) sv_peek(sv)
2060 #define SvPEEK(sv) ""
2063 #define SvIMMORTAL(sv) (SvREADONLY(sv) && ((sv)==&PL_sv_undef || (sv)==&PL_sv_yes || (sv)==&PL_sv_no || (sv)==&PL_sv_placeholder))
2066 /* exercise the immortal resurrection code in sv_free2() */
2067 # define SvREFCNT_IMMORTAL 1000
2069 # define SvREFCNT_IMMORTAL ((~(U32)0)/2)
2073 =for apidoc Am|SV *|boolSV|bool b
2075 Returns a true SV if C<b> is a true value, or a false SV if C<b> is 0.
2077 See also C<PL_sv_yes> and C<PL_sv_no>.
2082 #define boolSV(b) ((b) ? &PL_sv_yes : &PL_sv_no)
2084 #define isGV(sv) (SvTYPE(sv) == SVt_PVGV)
2085 /* If I give every macro argument a different name, then there won't be bugs
2086 where nested macros get confused. Been there, done that. */
2087 #define isGV_with_GP(pwadak) \
2088 (((SvFLAGS(pwadak) & (SVp_POK|SVpgv_GP)) == SVpgv_GP) \
2089 && (SvTYPE(pwadak) == SVt_PVGV || SvTYPE(pwadak) == SVt_PVLV))
2090 #define isGV_with_GP_on(sv) STMT_START { \
2091 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
2092 assert (!SvPOKp(sv)); \
2093 assert (!SvIOKp(sv)); \
2094 (SvFLAGS(sv) |= SVpgv_GP); \
2096 #define isGV_with_GP_off(sv) STMT_START { \
2097 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
2098 assert (!SvPOKp(sv)); \
2099 assert (!SvIOKp(sv)); \
2100 (SvFLAGS(sv) &= ~SVpgv_GP); \
2102 #define isREGEXP(sv) \
2103 (SvTYPE(sv) == SVt_REGEXP \
2104 || (SvFLAGS(sv) & (SVTYPEMASK|SVp_POK|SVpgv_GP|SVf_FAKE)) \
2105 == (SVt_PVLV|SVf_FAKE))
2108 #ifdef PERL_NEW_COPY_ON_WRITE
2109 # define SvGROW(sv,len) \
2110 (SvIsCOW(sv) || SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
2112 # define SvGROW(sv,len) (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
2114 #define SvGROW_mutable(sv,len) \
2115 (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX_mutable(sv))
2116 #define Sv_Grow sv_grow
2118 #define CLONEf_COPY_STACKS 1
2119 #define CLONEf_KEEP_PTR_TABLE 2
2120 #define CLONEf_CLONE_HOST 4
2121 #define CLONEf_JOIN_IN 8
2123 struct clone_params {
2126 PerlInterpreter *proto_perl;
2127 PerlInterpreter *new_perl;
2132 =for apidoc Am|SV*|newSVpvn_utf8|NULLOK const char* s|STRLEN len|U32 utf8
2134 Creates a new SV and copies a string into it. If utf8 is true, calls
2135 C<SvUTF8_on> on the new SV. Implemented as a wrapper around C<newSVpvn_flags>.
2140 #define newSVpvn_utf8(s, len, u) newSVpvn_flags((s), (len), (u) ? SVf_UTF8 : 0)
2143 =for apidoc Amx|SV*|newSVpadname|PADNAME *pn
2145 Creates a new SV containing the pad name. This is currently identical
2146 to C<newSVsv>, but pad names may cease being SVs at some point, so
2147 C<newSVpadname> is preferable.
2152 #define newSVpadname(pn) newSVsv(pn)
2155 =for apidoc Am|void|SvOOK_offset|NN SV*sv|STRLEN len
2157 Reads into I<len> the offset from SvPVX back to the true start of the
2158 allocated buffer, which will be non-zero if C<sv_chop> has been used to
2159 efficiently remove characters from start of the buffer. Implemented as a
2160 macro, which takes the address of I<len>, which must be of type C<STRLEN>.
2161 Evaluates I<sv> more than once. Sets I<len> to 0 if C<SvOOK(sv)> is false.
2167 /* Does the bot know something I don't?
2168 10:28 <@Nicholas> metabatman
2169 10:28 <+meta> Nicholas: crash
2171 # define SvOOK_offset(sv, offset) STMT_START { \
2172 assert(sizeof(offset) == sizeof(STRLEN)); \
2174 const U8 *_crash = (U8*)SvPVX_const(sv); \
2175 (offset) = *--_crash; \
2177 _crash -= sizeof(STRLEN); \
2178 Copy(_crash, (U8 *)&(offset), sizeof(STRLEN), U8); \
2181 /* Validate the preceding buffer's sentinels to \
2182 verify that no-one is using it. */ \
2183 const U8 *const _bonk = (U8*)SvPVX_const(sv) - (offset);\
2184 while (_crash > _bonk) { \
2186 assert (*_crash == (U8)PTR2UV(_crash)); \
2194 /* This is the same code, but avoids using any temporary variables: */
2195 # define SvOOK_offset(sv, offset) STMT_START { \
2196 assert(sizeof(offset) == sizeof(STRLEN)); \
2198 (offset) = ((U8*)SvPVX_const(sv))[-1]; \
2200 Copy(SvPVX_const(sv) - 1 - sizeof(STRLEN), \
2201 (U8*)&(offset), sizeof(STRLEN), U8); \
2209 #define newIO() MUTABLE_IO(newSV_type(SVt_PVIO))
2213 * c-indentation-style: bsd
2215 * indent-tabs-mode: nil
2218 * ex: set ts=8 sts=4 sw=4 et: