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 F<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 C<SVt_PVIO> is for I/O objects, C<SVt_PVFM> for formats, C<SVt_PVCV> for
45 subroutines, C<SVt_PVHV> for hashes and C<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 C<SVt_PVGV> represents a typeglob. If C<!SvFAKE(sv)>, then it is a real,
55 incoercible typeglob. If C<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. C<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. C<SVt_REGEXP> is for regular
61 expressions. C<SVt_INVLIST> is for Perl
62 core internal use only.
64 C<SVt_PVMG> represents a "normal" scalar (not a typeglob, regular expression,
65 or delegate). Since most scalars do not need all the internal fields of a
66 PVMG, we save memory by allocating smaller structs when possible. All the
67 other types are just simpler forms of C<SVt_PVMG>, with fewer internal fields.
68 C<SVt_NULL> can only hold undef. C<SVt_IV> can hold undef, an integer, or a
69 reference. (C<SVt_RV> is an alias for C<SVt_IV>, which exists for backward
70 compatibility.) C<SVt_NV> can hold any of those or a double. C<SVt_PV> can only
71 hold C<undef> or a string. C<SVt_PVIV> is a superset of C<SVt_PV> and C<SVt_IV>.
72 C<SVt_PVNV> is similar. C<SVt_PVMG> can hold anything C<SVt_PVNV> can hold, but it
73 can, but does not have to, be blessed or magical.
75 =for apidoc AmU||SVt_NULL
76 Type flag for scalars. See L</svtype>.
78 =for apidoc AmU||SVt_IV
79 Type flag for scalars. See L</svtype>.
81 =for apidoc AmU||SVt_NV
82 Type flag for scalars. See L</svtype>.
84 =for apidoc AmU||SVt_PV
85 Type flag for scalars. See L</svtype>.
87 =for apidoc AmU||SVt_PVIV
88 Type flag for scalars. See L</svtype>.
90 =for apidoc AmU||SVt_PVNV
91 Type flag for scalars. See L</svtype>.
93 =for apidoc AmU||SVt_PVMG
94 Type flag for scalars. See L</svtype>.
96 =for apidoc AmU||SVt_INVLIST
97 Type flag for scalars. See L</svtype>.
99 =for apidoc AmU||SVt_REGEXP
100 Type flag for regular expressions. See L</svtype>.
102 =for apidoc AmU||SVt_PVGV
103 Type flag for typeglobs. See L</svtype>.
105 =for apidoc AmU||SVt_PVLV
106 Type flag for scalars. See L</svtype>.
108 =for apidoc AmU||SVt_PVAV
109 Type flag for arrays. See L</svtype>.
111 =for apidoc AmU||SVt_PVHV
112 Type flag for hashes. See L</svtype>.
114 =for apidoc AmU||SVt_PVCV
115 Type flag for subroutines. See L</svtype>.
117 =for apidoc AmU||SVt_PVFM
118 Type flag for formats. See L</svtype>.
120 =for apidoc AmU||SVt_PVIO
121 Type flag for I/O objects. See L</svtype>.
125 These are ordered so that the simpler types have a lower value; SvUPGRADE
126 doesn't allow you to upgrade from a higher numbered type to a lower numbered
127 one; also there is code that assumes that anything that has as a PV component
128 has a type numbered >= SVt_PV.
134 /* BIND was here, before INVLIST replaced it. */
137 /* RV was here, before it was merged with IV. */
139 SVt_INVLIST, /* 4, implemented as a PV */
144 /* PVBM was here, before BIND replaced it. */
152 SVt_LAST /* keep last in enum. used to size arrays */
155 /* *** any alterations to the SV types above need to be reflected in
156 * SVt_MASK and the various PL_valid_types_* tables. As of this writing those
157 * tables are in perl.h. There are also two affected names tables in dump.c,
158 * one in B.xs, and 'bodies_by_type[]' in sv.c */
160 #define SVt_MASK 0xf /* smallest bitmask that covers all types */
163 /* Although Fast Boyer Moore tables are now being stored in PVGVs, for most
164 purposes external code wanting to consider PVBM probably needs to think of
166 # define SVt_PVBM SVt_PVMG
167 /* Anything wanting to create a reference from clean should ensure that it has
168 a scalar of type SVt_IV now: */
169 # define SVt_RV SVt_IV
172 /* There is collusion here with sv_clear - sv_clear exits early for SVt_NULL
173 so never reaches the clause at the end that uses sv_type_details->body_size
174 to determine whether to call safefree(). Hence body_size can be set
175 non-zero to record the size of HEs, without fear of bogus frees. */
176 #if defined(PERL_IN_HV_C) || defined(PERL_IN_XS_APITEST)
177 #define HE_SVSLOT SVt_NULL
180 # define SVt_FIRST SVt_NULL /* the type of SV that new_SV() in sv.c returns */
183 #define PERL_ARENA_ROOTS_SIZE (SVt_LAST)
185 /* typedefs to eliminate some typing */
186 typedef struct he HE;
187 typedef struct hek HEK;
189 /* Using C's structural equivalence to help emulate C++ inheritance here... */
191 /* start with 2 sv-head building blocks */
192 #define _SV_HEAD(ptrtype) \
193 ptrtype sv_any; /* pointer to body */ \
194 U32 sv_refcnt; /* how many references to us */ \
195 U32 sv_flags /* what we are */
198 # define _NV_BODYLESS_UNION NV svu_nv;
200 # define _NV_BODYLESS_UNION
203 #define _SV_HEAD_UNION \
205 char* svu_pv; /* pointer to malloced string */ \
209 SV* svu_rv; /* pointer to another SV */ \
210 struct regexp* svu_rx; \
218 #ifdef DEBUG_LEAKING_SCALARS
219 #define _SV_HEAD_DEBUG ;\
220 PERL_BITFIELD32 sv_debug_optype:9; /* the type of OP that allocated us */ \
221 PERL_BITFIELD32 sv_debug_inpad:1; /* was allocated in a pad for an OP */ \
222 PERL_BITFIELD32 sv_debug_line:16; /* the line where we were allocated */ \
223 UV sv_debug_serial; /* serial number of sv allocation */ \
224 char * sv_debug_file; /* the file where we were allocated */ \
225 SV * sv_debug_parent /* what we were cloned from (ithreads)*/
227 #define _SV_HEAD_DEBUG
230 struct STRUCT_SV { /* struct sv { */
236 _SV_HEAD(XPVGV*); /* pointer to xpvgv body */
241 _SV_HEAD(XPVCV*); /* pointer to xpvcv body */
246 _SV_HEAD(XPVAV*); /* pointer to xpvav body */
251 _SV_HEAD(XPVHV*); /* pointer to xpvhv body */
256 _SV_HEAD(XPVIO*); /* pointer to xpvio body */
261 _SV_HEAD(struct regexp*); /* pointer to regexp body */
266 #undef _SV_HEAD_UNION /* ensure no pollution */
269 =head1 SV Manipulation Functions
271 =for apidoc Am|U32|SvREFCNT|SV* sv
272 Returns the value of the object's reference count. Exposed
273 to perl code via Internals::SvREFCNT().
275 =for apidoc Am|SV*|SvREFCNT_inc|SV* sv
276 Increments the reference count of the given SV, returning the SV.
278 All of the following C<SvREFCNT_inc>* macros are optimized versions of
279 C<SvREFCNT_inc>, and can be replaced with C<SvREFCNT_inc>.
281 =for apidoc Am|SV*|SvREFCNT_inc_NN|SV* sv
282 Same as C<SvREFCNT_inc>, but can only be used if you know C<sv>
283 is not C<NULL>. Since we don't have to check the NULLness, it's faster
286 =for apidoc Am|void|SvREFCNT_inc_void|SV* sv
287 Same as C<SvREFCNT_inc>, but can only be used if you don't need the
288 return value. The macro doesn't need to return a meaningful value.
290 =for apidoc Am|void|SvREFCNT_inc_void_NN|SV* sv
291 Same as C<SvREFCNT_inc>, but can only be used if you don't need the return
292 value, and you know that C<sv> is not C<NULL>. The macro doesn't need
293 to return a meaningful value, or check for NULLness, so it's smaller
296 =for apidoc Am|SV*|SvREFCNT_inc_simple|SV* sv
297 Same as C<SvREFCNT_inc>, but can only be used with expressions without side
298 effects. Since we don't have to store a temporary value, it's faster.
300 =for apidoc Am|SV*|SvREFCNT_inc_simple_NN|SV* sv
301 Same as C<SvREFCNT_inc_simple>, but can only be used if you know C<sv>
302 is not C<NULL>. Since we don't have to check the NULLness, it's faster
305 =for apidoc Am|void|SvREFCNT_inc_simple_void|SV* sv
306 Same as C<SvREFCNT_inc_simple>, but can only be used if you don't need the
307 return value. The macro doesn't need to return a meaningful value.
309 =for apidoc Am|void|SvREFCNT_inc_simple_void_NN|SV* sv
310 Same as C<SvREFCNT_inc>, but can only be used if you don't need the return
311 value, and you know that C<sv> is not C<NULL>. The macro doesn't need
312 to return a meaningful value, or check for NULLness, so it's smaller
315 =for apidoc Am|void|SvREFCNT_dec|SV* sv
316 Decrements the reference count of the given SV. C<sv> may be C<NULL>.
318 =for apidoc Am|void|SvREFCNT_dec_NN|SV* sv
319 Same as C<SvREFCNT_dec>, but can only be used if you know C<sv>
320 is not C<NULL>. Since we don't have to check the NULLness, it's faster
323 =for apidoc Am|svtype|SvTYPE|SV* sv
324 Returns the type of the SV. See C<L</svtype>>.
326 =for apidoc Am|void|SvUPGRADE|SV* sv|svtype type
327 Used to upgrade an SV to a more complex form. Uses C<sv_upgrade> to
328 perform the upgrade if necessary. See C<L</svtype>>.
333 #define SvANY(sv) (sv)->sv_any
334 #define SvFLAGS(sv) (sv)->sv_flags
335 #define SvREFCNT(sv) (sv)->sv_refcnt
337 #define SvREFCNT_inc(sv) S_SvREFCNT_inc(MUTABLE_SV(sv))
338 #define SvREFCNT_inc_simple(sv) SvREFCNT_inc(sv)
339 #define SvREFCNT_inc_NN(sv) S_SvREFCNT_inc_NN(MUTABLE_SV(sv))
340 #define SvREFCNT_inc_void(sv) S_SvREFCNT_inc_void(MUTABLE_SV(sv))
342 /* These guys don't need the curly blocks */
343 #define SvREFCNT_inc_simple_void(sv) STMT_START { if (sv) SvREFCNT(sv)++; } STMT_END
344 #define SvREFCNT_inc_simple_NN(sv) (++(SvREFCNT(sv)),MUTABLE_SV(sv))
345 #define SvREFCNT_inc_void_NN(sv) (void)(++SvREFCNT(MUTABLE_SV(sv)))
346 #define SvREFCNT_inc_simple_void_NN(sv) (void)(++SvREFCNT(MUTABLE_SV(sv)))
348 #define SvREFCNT_dec(sv) S_SvREFCNT_dec(aTHX_ MUTABLE_SV(sv))
349 #define SvREFCNT_dec_NN(sv) S_SvREFCNT_dec_NN(aTHX_ MUTABLE_SV(sv))
351 #define SVTYPEMASK 0xff
352 #define SvTYPE(sv) ((svtype)((sv)->sv_flags & SVTYPEMASK))
354 /* Sadly there are some parts of the core that have pointers to already-freed
355 SV heads, and rely on being able to tell that they are now free. So mark
356 them all by using a consistent macro. */
357 #define SvIS_FREED(sv) UNLIKELY(((sv)->sv_flags == SVTYPEMASK))
359 /* this is defined in this peculiar way to avoid compiler warnings.
360 * See the <20121213131428.GD1842@iabyn.com> thread in p5p */
361 #define SvUPGRADE(sv, mt) \
362 ((void)(SvTYPE(sv) >= (mt) || (sv_upgrade(sv, mt),1)))
364 #define SVf_IOK 0x00000100 /* has valid public integer value */
365 #define SVf_NOK 0x00000200 /* has valid public numeric value */
366 #define SVf_POK 0x00000400 /* has valid public pointer value */
367 #define SVf_ROK 0x00000800 /* has a valid reference pointer */
369 #define SVp_IOK 0x00001000 /* has valid non-public integer value */
370 #define SVp_NOK 0x00002000 /* has valid non-public numeric value */
371 #define SVp_POK 0x00004000 /* has valid non-public pointer value */
372 #define SVp_SCREAM 0x00008000 /* currently unused on plain scalars */
373 #define SVphv_CLONEABLE SVp_SCREAM /* PVHV (stashes) clone its objects */
374 #define SVpgv_GP SVp_SCREAM /* GV has a valid GP */
375 #define SVprv_PCS_IMPORTED SVp_SCREAM /* RV is a proxy for a constant
376 subroutine in another package. Set the
377 GvIMPORTED_CV_on() if it needs to be
378 expanded to a real GV */
379 #define SVf_PROTECT 0x00010000 /* very read-only */
380 #define SVs_PADTMP 0x00020000 /* in use as tmp */
381 #define SVs_PADSTALE 0x00040000 /* lexical has gone out of scope;
382 only used when !PADTMP */
383 #define SVs_TEMP 0x00080000 /* mortal (implies string is stealable) */
384 #define SVs_OBJECT 0x00100000 /* is "blessed" */
385 #define SVs_GMG 0x00200000 /* has magical get method */
386 #define SVs_SMG 0x00400000 /* has magical set method */
387 #define SVs_RMG 0x00800000 /* has random magical methods */
389 #define SVf_FAKE 0x01000000 /* 0: glob is just a copy
390 1: SV head arena wasn't malloc()ed
391 2: For PVCV, whether CvUNIQUE(cv)
392 refers to an eval or once only
393 [CvEVAL(cv), CvSPECIAL(cv)]
394 3: HV: informally reserved by DAPM
396 #define SVf_OOK 0x02000000 /* has valid offset value. For a PVHV this
397 means that a hv_aux struct is present
398 after the main array */
399 #define SVf_BREAK 0x04000000 /* refcnt is artificially low - used by
400 SVs in final arena cleanup.
401 Set in S_regtry on PL_reg_curpm, so that
402 perl_destruct will skip it.
403 Used for mark and sweep by OP_AASSIGN
405 #define SVf_READONLY 0x08000000 /* may not be modified */
410 #define SVf_THINKFIRST (SVf_READONLY|SVf_PROTECT|SVf_ROK|SVf_FAKE \
413 #define SVf_OK (SVf_IOK|SVf_NOK|SVf_POK|SVf_ROK| \
414 SVp_IOK|SVp_NOK|SVp_POK|SVpgv_GP)
416 #define PRIVSHIFT 4 /* (SVp_?OK >> PRIVSHIFT) == SVf_?OK */
418 /* Note that SVf_AMAGIC is now only set on stashes. */
419 #define SVf_AMAGIC 0x10000000 /* has magical overloaded methods */
420 #define SVf_IsCOW 0x10000000 /* copy on write (shared hash key if
423 /* Ensure this value does not clash with the GV_ADD* flags in gv.h, or the
424 CV_CKPROTO_* flags in op.c, or the padadd_* flags in pad.h: */
425 #define SVf_UTF8 0x20000000 /* SvPV is UTF-8 encoded
426 This is also set on RVs whose overloaded
427 stringification is UTF-8. This might
428 only happen as a side effect of SvPV() */
430 #define SVphv_SHAREKEYS 0x20000000 /* PVHV keys live on shared string table */
432 /* PVAV could probably use 0x2000000 without conflict. I assume that PVFM can
433 be UTF-8 encoded, and PVCVs could well have UTF-8 prototypes. PVIOs haven't
434 been restructured, so sometimes get used as string buffers. */
437 /* Some private flags. */
440 /* The SVp_SCREAM|SVpbm_VALID (0x40008000) combination is up for grabs.
441 Formerly it was used for pad names, but now it is available. The core
442 is careful to avoid setting both flags.
444 SVf_POK, SVp_POK also set:
446 0x40004400 FBM compiled (SvVALID)
447 0x4000C400 *** Formerly used for pad names ***
449 0x00008000 GV with GP
450 0x00008800 RV with PCS imported
453 #define SVpav_REAL 0x40000000 /* free old entries */
455 #define SVphv_LAZYDEL 0x40000000 /* entry in xhv_eiter must be deleted */
456 /* This is only set true on a PVGV when it's playing "PVBM", but is tested for
457 on any regular scalar (anything <= PVLV) */
458 #define SVpbm_VALID 0x40000000
460 /* IV, PVIV, PVNV, PVMG, PVGV and (I assume) PVLV */
461 #define SVf_IVisUV 0x80000000 /* use XPVUV instead of XPVIV */
463 #define SVpav_REIFY 0x80000000 /* can become real */
465 #define SVphv_HASKFLAGS 0x80000000 /* keys have flag byte after hash */
466 /* PVGV when SVpbm_VALID is true */
467 #define SVpbm_TAIL 0x80000000 /* string has a fake "\n" appended */
468 /* RV upwards. However, SVf_ROK and SVp_IOK are exclusive */
469 #define SVprv_WEAKREF 0x80000000 /* Weak reference */
470 /* pad name vars only */
473 HV* xmg_stash; /* class package */ \
475 STRLEN xpv_cur; /* length of svu_pv as a C string */ \
477 STRLEN xpvlenu_len; /* allocated size */ \
478 char * xpvlenu_pv; /* regexp string */ \
481 #define xpv_len xpv_len_u.xpvlenu_len
484 NV xnv_nv; /* numeric value, if any */
486 line_t xnv_lines; /* used internally by S_scan_subst() */
490 IV xivu_iv; /* integer value */
492 HEK * xivu_namehek; /* xpvlv, xpvgv: GvNAME */
493 bool xivu_eval_seen; /* used internally by S_scan_subst() */
497 MAGIC* xmg_magic; /* linked list of magicalness */
498 STRLEN xmg_hash_index; /* used while freeing hash entries */
510 #define xiv_iv xiv_u.xivu_iv
517 #define xuv_uv xuv_u.xivu_uv
525 /* This structure must match the beginning of struct xpvhv in hv.h. */
538 SSize_t xlvu_stargoff;
542 char xlv_type; /* k=keys .=pos x=substr v=vec /=join/re
543 * y=alem/helem/iter t=tie T=tied HE */
544 char xlv_flags; /* 1 = negative offset 2 = negative len */
547 #define xlv_targoff xlv_targoff_u.xlvu_targoff
551 IV prev_index; /* caches result of previous invlist_search() */
552 STRLEN iterator; /* Stores where we are in iterating */
553 bool is_offset; /* The data structure for all inversion lists
554 begins with an element for code point U+0000.
555 If this bool is set, the actual list contains
556 that 0; otherwise, the list actually begins
557 with the following element. Thus to invert
558 the list, merely toggle this flag */
561 /* This structure works in 3 ways - regular scalar, GV with GP, or fast
569 typedef U32 cv_flags_t;
571 #define _XPVCV_COMMON \
579 void (*xcv_xsub) (pTHX_ CV*); \
587 PADLIST * xcv_padlist; \
591 U32 xcv_outside_seq; /* the COP sequence (at the point of our \
592 * compilation) in the lexically enclosing \
594 cv_flags_t xcv_flags; \
595 I32 xcv_depth /* >= 2 indicates recursive call */
597 /* This structure must match XPVCV in cv.h */
608 /* ifp and ofp are normally the same, but sockets need separate streams */
610 /* Cray addresses everything by word boundaries (64 bits) and
611 * code and data pointers cannot be mixed (which is exactly what
612 * Perl_filter_add() tries to do with the dirp), hence the
613 * following union trick (as suggested by Gurusamy Sarathy).
614 * For further information see Geir Johansen's problem report
615 * titled [ID 20000612.002 (#3366)] Perl problem on Cray system
616 * The any pointer (known as IoANY()) will also be a good place
617 * to hang any IO disciplines to.
620 DIR * xiou_dirp; /* for opendir, readdir, etc */
621 void * xiou_any; /* for alignment */
623 /* IV xio_lines is now in IVX $. */
624 IV xio_page; /* $% */
625 IV xio_page_len; /* $= */
626 IV xio_lines_left; /* $- */
627 char * xio_top_name; /* $^ */
628 GV * xio_top_gv; /* $^ */
629 char * xio_fmt_name; /* $~ */
630 GV * xio_fmt_gv; /* $~ */
631 char * xio_bottom_name;/* $^B */
632 GV * xio_bottom_gv; /* $^B */
637 #define xio_dirp xio_dirpu.xiou_dirp
638 #define xio_any xio_dirpu.xiou_any
640 #define IOf_ARGV 1 /* this fp iterates over ARGV */
641 #define IOf_START 2 /* check for null ARGV and substitute '-' */
642 #define IOf_FLUSH 4 /* this fp wants a flush after write op */
643 #define IOf_DIDTOP 8 /* just did top of form */
644 #define IOf_UNTAINT 16 /* consider this fp (and its data) "safe" */
645 #define IOf_NOLINE 32 /* slurped a pseudo-line from empty file */
646 #define IOf_FAKE_DIRP 64 /* xio_dirp is fake (source filters kludge)
647 Also, when this is set, SvPVX() is valid */
649 /* The following macros define implementation-independent predicates on SVs. */
652 =for apidoc Am|U32|SvNIOK|SV* sv
653 Returns a U32 value indicating whether the SV contains a number, integer or
656 =for apidoc Am|U32|SvNIOKp|SV* sv
657 Returns a U32 value indicating whether the SV contains a number, integer or
658 double. Checks the B<private> setting. Use C<SvNIOK> instead.
660 =for apidoc Am|void|SvNIOK_off|SV* sv
661 Unsets the NV/IV status of an SV.
663 =for apidoc Am|U32|SvOK|SV* sv
664 Returns a U32 value indicating whether the value is defined. This is
665 only meaningful for scalars.
667 =for apidoc Am|U32|SvIOKp|SV* sv
668 Returns a U32 value indicating whether the SV contains an integer. Checks
669 the B<private> setting. Use C<SvIOK> instead.
671 =for apidoc Am|U32|SvNOKp|SV* sv
672 Returns a U32 value indicating whether the SV contains a double. Checks the
673 B<private> setting. Use C<SvNOK> instead.
675 =for apidoc Am|U32|SvPOKp|SV* sv
676 Returns a U32 value indicating whether the SV contains a character string.
677 Checks the B<private> setting. Use C<SvPOK> instead.
679 =for apidoc Am|U32|SvIOK|SV* sv
680 Returns a U32 value indicating whether the SV contains an integer.
682 =for apidoc Am|void|SvIOK_on|SV* sv
683 Tells an SV that it is an integer.
685 =for apidoc Am|void|SvIOK_off|SV* sv
686 Unsets the IV status of an SV.
688 =for apidoc Am|void|SvIOK_only|SV* sv
689 Tells an SV that it is an integer and disables all other C<OK> bits.
691 =for apidoc Am|void|SvIOK_only_UV|SV* sv
692 Tells an SV that it is an unsigned integer and disables all other C<OK> bits.
694 =for apidoc Am|bool|SvIOK_UV|SV* sv
695 Returns a boolean indicating whether the SV contains an integer that must be
696 interpreted as unsigned. A non-negative integer whose value is within the
697 range of both an IV and a UV may be be flagged as either C<SvUOK> or C<SVIOK>.
699 =for apidoc Am|bool|SvUOK|SV* sv
700 Returns a boolean indicating whether the SV contains an integer that must be
701 interpreted as unsigned. A non-negative integer whose value is within the
702 range of both an IV and a UV may be be flagged as either C<SvUOK> or C<SVIOK>.
704 =for apidoc Am|bool|SvIOK_notUV|SV* sv
705 Returns a boolean indicating whether the SV contains a signed integer.
707 =for apidoc Am|U32|SvNOK|SV* sv
708 Returns a U32 value indicating whether the SV contains a double.
710 =for apidoc Am|void|SvNOK_on|SV* sv
711 Tells an SV that it is a double.
713 =for apidoc Am|void|SvNOK_off|SV* sv
714 Unsets the NV status of an SV.
716 =for apidoc Am|void|SvNOK_only|SV* sv
717 Tells an SV that it is a double and disables all other OK bits.
719 =for apidoc Am|U32|SvPOK|SV* sv
720 Returns a U32 value indicating whether the SV contains a character
723 =for apidoc Am|void|SvPOK_on|SV* sv
724 Tells an SV that it is a string.
726 =for apidoc Am|void|SvPOK_off|SV* sv
727 Unsets the PV status of an SV.
729 =for apidoc Am|void|SvPOK_only|SV* sv
730 Tells an SV that it is a string and disables all other C<OK> bits.
731 Will also turn off the UTF-8 status.
733 =for apidoc Am|bool|SvVOK|SV* sv
734 Returns a boolean indicating whether the SV contains a v-string.
736 =for apidoc Am|U32|SvOOK|SV* sv
737 Returns a U32 indicating whether the pointer to the string buffer is offset.
738 This hack is used internally to speed up removal of characters from the
739 beginning of a C<SvPV>. When C<SvOOK> is true, then the start of the
740 allocated string buffer is actually C<SvOOK_offset()> bytes before C<SvPVX>.
741 This offset used to be stored in C<SvIVX>, but is now stored within the spare
744 =for apidoc Am|U32|SvROK|SV* sv
745 Tests if the SV is an RV.
747 =for apidoc Am|void|SvROK_on|SV* sv
748 Tells an SV that it is an RV.
750 =for apidoc Am|void|SvROK_off|SV* sv
751 Unsets the RV status of an SV.
753 =for apidoc Am|SV*|SvRV|SV* sv
754 Dereferences an RV to return the SV.
756 =for apidoc Am|IV|SvIVX|SV* sv
757 Returns the raw value in the SV's IV slot, without checks or conversions.
758 Only use when you are sure C<SvIOK> is true. See also C<L</SvIV>>.
760 =for apidoc Am|UV|SvUVX|SV* sv
761 Returns the raw value in the SV's UV slot, without checks or conversions.
762 Only use when you are sure C<SvIOK> is true. See also C<L</SvUV>>.
764 =for apidoc Am|NV|SvNVX|SV* sv
765 Returns the raw value in the SV's NV slot, without checks or conversions.
766 Only use when you are sure C<SvNOK> is true. See also C<L</SvNV>>.
768 =for apidoc Am|char*|SvPVX|SV* sv
769 Returns a pointer to the physical string in the SV. The SV must contain a
770 string. Prior to 5.9.3 it is not safe
771 to execute this macro unless the SV's
774 This is also used to store the name of an autoloaded subroutine in an XS
775 AUTOLOAD routine. See L<perlguts/Autoloading with XSUBs>.
777 =for apidoc Am|STRLEN|SvCUR|SV* sv
778 Returns the length of the string which is in the SV. See C<L</SvLEN>>.
780 =for apidoc Am|STRLEN|SvLEN|SV* sv
781 Returns the size of the string buffer in the SV, not including any part
782 attributable to C<SvOOK>. See C<L</SvCUR>>.
784 =for apidoc Am|char*|SvEND|SV* sv
785 Returns a pointer to the spot just after the last character in
786 the string which is in the SV, where there is usually a trailing
787 C<NUL> character (even though Perl scalars do not strictly require it).
788 See C<L</SvCUR>>. Access the character as C<*(SvEND(sv))>.
790 Warning: If C<SvCUR> is equal to C<SvLEN>, then C<SvEND> points to
793 =for apidoc Am|HV*|SvSTASH|SV* sv
794 Returns the stash of the SV.
796 =for apidoc Am|void|SvIV_set|SV* sv|IV val
797 Set the value of the IV pointer in sv to val. It is possible to perform
798 the same function of this macro with an lvalue assignment to C<SvIVX>.
799 With future Perls, however, it will be more efficient to use
800 C<SvIV_set> instead of the lvalue assignment to C<SvIVX>.
802 =for apidoc Am|void|SvNV_set|SV* sv|NV val
803 Set the value of the NV pointer in C<sv> to val. See C<L</SvIV_set>>.
805 =for apidoc Am|void|SvPV_set|SV* sv|char* val
806 This is probably not what you want to use, you probably wanted
807 L</sv_usepvn_flags> or L</sv_setpvn> or L</sv_setpvs>.
809 Set the value of the PV pointer in C<sv> to the Perl allocated
810 C<NUL>-terminated string C<val>. See also C<L</SvIV_set>>.
812 Remember to free the previous PV buffer. There are many things to check.
813 Beware that the existing pointer may be involved in copy-on-write or other
814 mischief, so do C<SvOOK_off(sv)> and use C<sv_force_normal> or
815 C<SvPV_force> (or check the C<SvIsCOW> flag) first to make sure this
816 modification is safe. Then finally, if it is not a COW, call C<SvPV_free> to
817 free the previous PV buffer.
819 =for apidoc Am|void|SvUV_set|SV* sv|UV val
820 Set the value of the UV pointer in C<sv> to val. See C<L</SvIV_set>>.
822 =for apidoc Am|void|SvRV_set|SV* sv|SV* val
823 Set the value of the RV pointer in C<sv> to val. See C<L</SvIV_set>>.
825 =for apidoc Am|void|SvMAGIC_set|SV* sv|MAGIC* val
826 Set the value of the MAGIC pointer in C<sv> to val. See C<L</SvIV_set>>.
828 =for apidoc Am|void|SvSTASH_set|SV* sv|HV* val
829 Set the value of the STASH pointer in C<sv> to val. See C<L</SvIV_set>>.
831 =for apidoc Am|void|SvCUR_set|SV* sv|STRLEN len
832 Set the current length of the string which is in the SV. See C<L</SvCUR>>
835 =for apidoc Am|void|SvLEN_set|SV* sv|STRLEN len
836 Set the size of the string buffer for the SV. See C<L</SvLEN>>.
841 #define SvNIOK(sv) (SvFLAGS(sv) & (SVf_IOK|SVf_NOK))
842 #define SvNIOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK))
843 #define SvNIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK| \
844 SVp_IOK|SVp_NOK|SVf_IVisUV))
846 #define assert_not_ROK(sv) assert_(!SvROK(sv) || !SvRV(sv))
847 #define assert_not_glob(sv) assert_(!isGV_with_GP(sv))
849 #define SvOK(sv) (SvFLAGS(sv) & SVf_OK || isREGEXP(sv))
850 #define SvOK_off(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
851 SvFLAGS(sv) &= ~(SVf_OK| \
852 SVf_IVisUV|SVf_UTF8), \
854 #define SvOK_off_exc_UV(sv) (assert_not_ROK(sv) \
855 SvFLAGS(sv) &= ~(SVf_OK| \
859 #define SvOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK))
860 #define SvIOKp(sv) (SvFLAGS(sv) & SVp_IOK)
861 #define SvIOKp_on(sv) (assert_not_glob(sv) \
862 SvFLAGS(sv) |= SVp_IOK)
863 #define SvNOKp(sv) (SvFLAGS(sv) & SVp_NOK)
864 #define SvNOKp_on(sv) (assert_not_glob(sv) SvFLAGS(sv) |= SVp_NOK)
865 #define SvPOKp(sv) (SvFLAGS(sv) & SVp_POK)
866 #define SvPOKp_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
867 SvFLAGS(sv) |= SVp_POK)
869 #define SvIOK(sv) (SvFLAGS(sv) & SVf_IOK)
870 #define SvIOK_on(sv) (assert_not_glob(sv) \
871 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
872 #define SvIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVp_IOK|SVf_IVisUV))
873 #define SvIOK_only(sv) (SvOK_off(sv), \
874 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
875 #define SvIOK_only_UV(sv) (assert_not_glob(sv) SvOK_off_exc_UV(sv), \
876 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
878 #define SvIOK_UV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
879 == (SVf_IOK|SVf_IVisUV))
880 #define SvUOK(sv) SvIOK_UV(sv)
881 #define SvIOK_notUV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
884 #define SvIsUV(sv) (SvFLAGS(sv) & SVf_IVisUV)
885 #define SvIsUV_on(sv) (SvFLAGS(sv) |= SVf_IVisUV)
886 #define SvIsUV_off(sv) (SvFLAGS(sv) &= ~SVf_IVisUV)
888 #define SvNOK(sv) (SvFLAGS(sv) & SVf_NOK)
889 #define SvNOK_on(sv) (assert_not_glob(sv) \
890 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
891 #define SvNOK_off(sv) (SvFLAGS(sv) &= ~(SVf_NOK|SVp_NOK))
892 #define SvNOK_only(sv) (SvOK_off(sv), \
893 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
896 =for apidoc Am|U32|SvUTF8|SV* sv
897 Returns a U32 value indicating the UTF-8 status of an SV. If things are set-up
898 properly, this indicates whether or not the SV contains UTF-8 encoded data.
899 You should use this I<after> a call to C<SvPV()> or one of its variants, in
900 case any call to string overloading updates the internal flag.
902 If you want to take into account the L<bytes> pragma, use C<L</DO_UTF8>>
905 =for apidoc Am|void|SvUTF8_on|SV *sv
906 Turn on the UTF-8 status of an SV (the data is not changed, just the flag).
907 Do not use frivolously.
909 =for apidoc Am|void|SvUTF8_off|SV *sv
910 Unsets the UTF-8 status of an SV (the data is not changed, just the flag).
911 Do not use frivolously.
913 =for apidoc Am|void|SvPOK_only_UTF8|SV* sv
914 Tells an SV that it is a string and disables all other C<OK> bits,
915 and leaves the UTF-8 status as it was.
920 /* Ensure the return value of this macro does not clash with the GV_ADD* flags
922 #define SvUTF8(sv) (SvFLAGS(sv) & SVf_UTF8)
923 #define SvUTF8_on(sv) (SvFLAGS(sv) |= (SVf_UTF8))
924 #define SvUTF8_off(sv) (SvFLAGS(sv) &= ~(SVf_UTF8))
926 #define SvPOK(sv) (SvFLAGS(sv) & SVf_POK)
927 #define SvPOK_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
928 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
929 #define SvPOK_off(sv) (SvFLAGS(sv) &= ~(SVf_POK|SVp_POK))
930 #define SvPOK_only(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
931 SvFLAGS(sv) &= ~(SVf_OK| \
932 SVf_IVisUV|SVf_UTF8), \
933 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
934 #define SvPOK_only_UTF8(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
935 SvFLAGS(sv) &= ~(SVf_OK| \
937 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
939 #define SvVOK(sv) (SvMAGICAL(sv) \
940 && mg_find(sv,PERL_MAGIC_vstring))
941 /* returns the vstring magic, if any */
942 #define SvVSTRING_mg(sv) (SvMAGICAL(sv) \
943 ? mg_find(sv,PERL_MAGIC_vstring) : NULL)
945 #define SvOOK(sv) (SvFLAGS(sv) & SVf_OOK)
946 #define SvOOK_on(sv) (SvFLAGS(sv) |= SVf_OOK)
947 #define SvOOK_off(sv) ((void)(SvOOK(sv) && (sv_backoff(sv),0)))
949 #define SvFAKE(sv) (SvFLAGS(sv) & SVf_FAKE)
950 #define SvFAKE_on(sv) (SvFLAGS(sv) |= SVf_FAKE)
951 #define SvFAKE_off(sv) (SvFLAGS(sv) &= ~SVf_FAKE)
953 #define SvROK(sv) (SvFLAGS(sv) & SVf_ROK)
954 #define SvROK_on(sv) (SvFLAGS(sv) |= SVf_ROK)
955 #define SvROK_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK))
957 #define SvMAGICAL(sv) (SvFLAGS(sv) & (SVs_GMG|SVs_SMG|SVs_RMG))
958 #define SvMAGICAL_on(sv) (SvFLAGS(sv) |= (SVs_GMG|SVs_SMG|SVs_RMG))
959 #define SvMAGICAL_off(sv) (SvFLAGS(sv) &= ~(SVs_GMG|SVs_SMG|SVs_RMG))
961 #define SvGMAGICAL(sv) (SvFLAGS(sv) & SVs_GMG)
962 #define SvGMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_GMG)
963 #define SvGMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_GMG)
965 #define SvSMAGICAL(sv) (SvFLAGS(sv) & SVs_SMG)
966 #define SvSMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_SMG)
967 #define SvSMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_SMG)
969 #define SvRMAGICAL(sv) (SvFLAGS(sv) & SVs_RMG)
970 #define SvRMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_RMG)
971 #define SvRMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_RMG)
973 #define SvAMAGIC(sv) (SvROK(sv) && SvOBJECT(SvRV(sv)) && \
974 HvAMAGIC(SvSTASH(SvRV(sv))))
976 /* To be used on the stashes themselves: */
977 #define HvAMAGIC(hv) (SvFLAGS(hv) & SVf_AMAGIC)
978 #define HvAMAGIC_on(hv) (SvFLAGS(hv) |= SVf_AMAGIC)
979 #define HvAMAGIC_off(hv) (SvFLAGS(hv) &=~ SVf_AMAGIC)
982 /* "nog" means "doesn't have get magic" */
983 #define SvPOK_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVs_GMG)) == SVf_POK)
984 #define SvIOK_nog(sv) ((SvFLAGS(sv) & (SVf_IOK|SVs_GMG)) == SVf_IOK)
985 #define SvUOK_nog(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV|SVs_GMG)) == (SVf_IOK|SVf_IVisUV))
986 #define SvNOK_nog(sv) ((SvFLAGS(sv) & (SVf_NOK|SVs_GMG)) == SVf_NOK)
987 #define SvNIOK_nog(sv) (SvNIOK(sv) && !(SvFLAGS(sv) & SVs_GMG))
989 #define SvPOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
990 #define SvIOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_THINKFIRST|SVs_GMG)) == SVf_IOK)
991 #define SvUOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV|SVf_THINKFIRST|SVs_GMG)) == (SVf_IOK|SVf_IVisUV))
992 #define SvNOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_NOK|SVf_THINKFIRST|SVs_GMG)) == SVf_NOK)
993 #define SvNIOK_nogthink(sv) (SvNIOK(sv) && !(SvFLAGS(sv) & (SVf_THINKFIRST|SVs_GMG)))
995 #define SvPOK_utf8_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVs_GMG)) == (SVf_POK|SVf_UTF8))
996 #define SvPOK_utf8_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST|SVs_GMG)) == (SVf_POK|SVf_UTF8))
998 #define SvPOK_byte_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVs_GMG)) == SVf_POK)
999 #define SvPOK_byte_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
1001 #define SvPOK_pure_nogthink(sv) \
1002 ((SvFLAGS(sv) & (SVf_POK|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
1003 #define SvPOK_utf8_pure_nogthink(sv) \
1004 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == (SVf_POK|SVf_UTF8))
1005 #define SvPOK_byte_pure_nogthink(sv) \
1006 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
1009 =for apidoc Am|U32|SvGAMAGIC|SV* sv
1011 Returns true if the SV has get magic or
1012 overloading. If either is true then
1013 the scalar is active data, and has the potential to return a new value every
1014 time it is accessed. Hence you must be careful to
1015 only read it once per user logical operation and work
1016 with that returned value. If neither is true then
1017 the scalar's value cannot change unless written to.
1022 #define SvGAMAGIC(sv) (SvGMAGICAL(sv) || SvAMAGIC(sv))
1024 #define Gv_AMG(stash) \
1025 (HvNAME(stash) && Gv_AMupdate(stash,FALSE) \
1027 : (HvAMAGIC_off(stash), 0))
1029 #define SvWEAKREF(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_WEAKREF)) \
1030 == (SVf_ROK|SVprv_WEAKREF))
1031 #define SvWEAKREF_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_WEAKREF))
1032 #define SvWEAKREF_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_WEAKREF))
1034 #define SvPCS_IMPORTED(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_PCS_IMPORTED)) \
1035 == (SVf_ROK|SVprv_PCS_IMPORTED))
1036 #define SvPCS_IMPORTED_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_PCS_IMPORTED))
1037 #define SvPCS_IMPORTED_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_PCS_IMPORTED))
1040 =for apidoc m|U32|SvTHINKFIRST|SV *sv
1042 A quick flag check to see whether an C<sv> should be passed to C<sv_force_normal>
1043 to be "downgraded" before C<SvIVX> or C<SvPVX> can be modified directly.
1045 For example, if your scalar is a reference and you want to modify the C<SvIVX>
1046 slot, you can't just do C<SvROK_off>, as that will leak the referent.
1048 This is used internally by various sv-modifying functions, such as
1049 C<sv_setsv>, C<sv_setiv> and C<sv_pvn_force>.
1051 One case that this does not handle is a gv without SvFAKE set. After
1053 if (SvTHINKFIRST(gv)) sv_force_normal(gv);
1055 it will still be a gv.
1057 C<SvTHINKFIRST> sometimes produces false positives. In those cases
1058 C<sv_force_normal> does nothing.
1063 #define SvTHINKFIRST(sv) (SvFLAGS(sv) & SVf_THINKFIRST)
1066 #define SvPADMY(sv) !(SvFLAGS(sv) & SVs_PADTMP)
1068 # define SvPADMY_on(sv) SvPADTMP_off(sv)
1071 #define SvPADTMP(sv) (SvFLAGS(sv) & (SVs_PADTMP))
1072 #define SvPADSTALE(sv) (SvFLAGS(sv) & (SVs_PADSTALE))
1074 #define SvPADTMP_on(sv) (SvFLAGS(sv) |= SVs_PADTMP)
1075 #define SvPADTMP_off(sv) (SvFLAGS(sv) &= ~SVs_PADTMP)
1076 #define SvPADSTALE_on(sv) S_SvPADSTALE_on(MUTABLE_SV(sv))
1077 #define SvPADSTALE_off(sv) S_SvPADSTALE_off(MUTABLE_SV(sv))
1079 #define SvTEMP(sv) (SvFLAGS(sv) & SVs_TEMP)
1080 #define SvTEMP_on(sv) (SvFLAGS(sv) |= SVs_TEMP)
1081 #define SvTEMP_off(sv) (SvFLAGS(sv) &= ~SVs_TEMP)
1083 #define SvOBJECT(sv) (SvFLAGS(sv) & SVs_OBJECT)
1084 #define SvOBJECT_on(sv) (SvFLAGS(sv) |= SVs_OBJECT)
1085 #define SvOBJECT_off(sv) (SvFLAGS(sv) &= ~SVs_OBJECT)
1088 =for apidoc Am|U32|SvREADONLY|SV* sv
1089 Returns true if the argument is readonly, otherwise returns false.
1090 Exposed to to perl code via Internals::SvREADONLY().
1092 =for apidoc Am|U32|SvREADONLY_on|SV* sv
1093 Mark an object as readonly. Exactly what this means depends on the object
1094 type. Exposed to perl code via Internals::SvREADONLY().
1096 =for apidoc Am|U32|SvREADONLY_off|SV* sv
1097 Mark an object as not-readonly. Exactly what this mean depends on the
1098 object type. Exposed to perl code via Internals::SvREADONLY().
1103 #define SvREADONLY(sv) (SvFLAGS(sv) & (SVf_READONLY|SVf_PROTECT))
1105 # define SvREADONLY_on(sv) (SvFLAGS(sv) |= (SVf_READONLY|SVf_PROTECT))
1106 # define SvREADONLY_off(sv) (SvFLAGS(sv) &=~(SVf_READONLY|SVf_PROTECT))
1108 # define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1109 # define SvREADONLY_off(sv) (SvFLAGS(sv) &= ~SVf_READONLY)
1112 #define SvSCREAM(sv) ((SvFLAGS(sv) & (SVp_SCREAM|SVp_POK)) == (SVp_SCREAM|SVp_POK))
1113 #define SvSCREAM_on(sv) (SvFLAGS(sv) |= SVp_SCREAM)
1114 #define SvSCREAM_off(sv) (SvFLAGS(sv) &= ~SVp_SCREAM)
1117 # define SvCOMPILED(sv) 0
1118 # define SvCOMPILED_on(sv)
1119 # define SvCOMPILED_off(sv)
1122 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1123 # define SvVALID(sv) ({ const SV *const _svvalid = (const SV*)(sv); \
1124 if (SvFLAGS(_svvalid) & SVpbm_VALID && !SvSCREAM(_svvalid)) \
1125 assert(!isGV_with_GP(_svvalid)); \
1126 (SvFLAGS(_svvalid) & SVpbm_VALID); \
1128 # define SvVALID_on(sv) ({ SV *const _svvalid = MUTABLE_SV(sv); \
1129 assert(!isGV_with_GP(_svvalid)); \
1130 assert(!SvSCREAM(_svvalid)); \
1131 (SvFLAGS(_svvalid) |= SVpbm_VALID); \
1133 # define SvVALID_off(sv) ({ SV *const _svvalid = MUTABLE_SV(sv); \
1134 assert(!isGV_with_GP(_svvalid)); \
1135 assert(!SvSCREAM(_svvalid)); \
1136 (SvFLAGS(_svvalid) &= ~SVpbm_VALID); \
1139 # define SvTAIL(sv) ({ const SV *const _svtail = (const SV *)(sv); \
1140 assert(SvTYPE(_svtail) != SVt_PVAV); \
1141 assert(SvTYPE(_svtail) != SVt_PVHV); \
1142 assert(!SvSCREAM(_svtail)); \
1143 (SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
1144 == (SVpbm_TAIL|SVpbm_VALID); \
1147 # define SvVALID(sv) ((SvFLAGS(sv) & SVpbm_VALID) && !SvSCREAM(sv))
1148 # define SvVALID_on(sv) (SvFLAGS(sv) |= SVpbm_VALID)
1149 # define SvVALID_off(sv) (SvFLAGS(sv) &= ~SVpbm_VALID)
1150 # define SvTAIL(sv) ((SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
1151 == (SVpbm_TAIL|SVpbm_VALID))
1154 #define SvTAIL_on(sv) (SvFLAGS(sv) |= SVpbm_TAIL)
1155 #define SvTAIL_off(sv) (SvFLAGS(sv) &= ~SVpbm_TAIL)
1157 #define SvRVx(sv) SvRV(sv)
1159 #ifdef PERL_DEBUG_COW
1160 /* Need -0.0 for SvNVX to preserve IEEE FP "negative zero" because
1161 +0.0 + -0.0 => +0.0 but -0.0 + -0.0 => -0.0 */
1162 # define SvIVX(sv) (0 + ((XPVIV*) SvANY(sv))->xiv_iv)
1163 # define SvUVX(sv) (0 + ((XPVUV*) SvANY(sv))->xuv_uv)
1164 # define SvNVX(sv) (-0.0 + ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv)
1165 # define SvRV(sv) (0 + (sv)->sv_u.svu_rv)
1166 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1167 /* Don't test the core XS code yet. */
1168 # if defined (PERL_CORE) && PERL_DEBUG_COW > 1
1169 # define SvPVX(sv) (0 + (assert_(!SvREADONLY(sv)) (sv)->sv_u.svu_pv))
1171 # define SvPVX(sv) SvPVX_mutable(sv)
1173 # define SvCUR(sv) (0 + ((XPV*) SvANY(sv))->xpv_cur)
1174 # define SvLEN(sv) (0 + ((XPV*) SvANY(sv))->xpv_len)
1175 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1177 # define SvMAGIC(sv) (0 + *(assert_(SvTYPE(sv) >= SVt_PVMG) &((XPVMG*) SvANY(sv))->xmg_u.xmg_magic))
1178 # define SvSTASH(sv) (0 + *(assert_(SvTYPE(sv) >= SVt_PVMG) &((XPVMG*) SvANY(sv))->xmg_stash))
1180 # define SvLEN(sv) ((XPV*) SvANY(sv))->xpv_len
1181 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1183 # if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1184 /* These get expanded inside other macros that already use a variable _sv */
1185 # define SvPVX(sv) \
1186 (*({ SV *const _svpvx = MUTABLE_SV(sv); \
1187 assert(PL_valid_types_PVX[SvTYPE(_svpvx) & SVt_MASK]); \
1188 assert(!isGV_with_GP(_svpvx)); \
1189 assert(!(SvTYPE(_svpvx) == SVt_PVIO \
1190 && !(IoFLAGS(_svpvx) & IOf_FAKE_DIRP))); \
1191 &((_svpvx)->sv_u.svu_pv); \
1193 # define SvCUR(sv) \
1194 (*({ const SV *const _svcur = (const SV *)(sv); \
1195 assert(PL_valid_types_PVX[SvTYPE(_svcur) & SVt_MASK] \
1196 || SvTYPE(_svcur) == SVt_REGEXP); \
1197 assert(!isGV_with_GP(_svcur)); \
1198 assert(!(SvTYPE(_svcur) == SVt_PVIO \
1199 && !(IoFLAGS(_svcur) & IOf_FAKE_DIRP))); \
1200 &(((XPV*) MUTABLE_PTR(SvANY(_svcur)))->xpv_cur); \
1202 # define SvIVX(sv) \
1203 (*({ const SV *const _svivx = (const SV *)(sv); \
1204 assert(PL_valid_types_IVX[SvTYPE(_svivx) & SVt_MASK]); \
1205 assert(!isGV_with_GP(_svivx)); \
1206 &(((XPVIV*) MUTABLE_PTR(SvANY(_svivx)))->xiv_iv); \
1208 # define SvUVX(sv) \
1209 (*({ const SV *const _svuvx = (const SV *)(sv); \
1210 assert(PL_valid_types_IVX[SvTYPE(_svuvx) & SVt_MASK]); \
1211 assert(!isGV_with_GP(_svuvx)); \
1212 &(((XPVUV*) MUTABLE_PTR(SvANY(_svuvx)))->xuv_uv); \
1214 # define SvNVX(sv) \
1215 (*({ const SV *const _svnvx = (const SV *)(sv); \
1216 assert(PL_valid_types_NVX[SvTYPE(_svnvx) & SVt_MASK]); \
1217 assert(!isGV_with_GP(_svnvx)); \
1218 &(((XPVNV*) MUTABLE_PTR(SvANY(_svnvx)))->xnv_u.xnv_nv); \
1221 (*({ SV *const _svrv = MUTABLE_SV(sv); \
1222 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1223 assert(!isGV_with_GP(_svrv)); \
1224 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1225 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1226 &((_svrv)->sv_u.svu_rv); \
1228 # define SvRV_const(sv) \
1229 ({ const SV *const _svrv = (const SV *)(sv); \
1230 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1231 assert(!isGV_with_GP(_svrv)); \
1232 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1233 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1234 (_svrv)->sv_u.svu_rv; \
1236 # define SvMAGIC(sv) \
1237 (*({ const SV *const _svmagic = (const SV *)(sv); \
1238 assert(SvTYPE(_svmagic) >= SVt_PVMG); \
1239 &(((XPVMG*) MUTABLE_PTR(SvANY(_svmagic)))->xmg_u.xmg_magic); \
1241 # define SvSTASH(sv) \
1242 (*({ const SV *const _svstash = (const SV *)(sv); \
1243 assert(SvTYPE(_svstash) >= SVt_PVMG); \
1244 &(((XPVMG*) MUTABLE_PTR(SvANY(_svstash)))->xmg_stash); \
1247 # define SvPVX(sv) ((sv)->sv_u.svu_pv)
1248 # define SvCUR(sv) ((XPV*) SvANY(sv))->xpv_cur
1249 # define SvIVX(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1250 # define SvUVX(sv) ((XPVUV*) SvANY(sv))->xuv_uv
1251 # define SvNVX(sv) ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv
1252 # define SvRV(sv) ((sv)->sv_u.svu_rv)
1253 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1254 # define SvMAGIC(sv) ((XPVMG*) SvANY(sv))->xmg_u.xmg_magic
1255 # define SvSTASH(sv) ((XPVMG*) SvANY(sv))->xmg_stash
1260 /* Given that these two are new, there can't be any existing code using them
1262 # define SvPVX_mutable(sv) (0 + (sv)->sv_u.svu_pv)
1263 # define SvPVX_const(sv) ((const char*)(0 + (sv)->sv_u.svu_pv))
1265 /* Except for the poison code, which uses & to scribble over the pointer after
1266 free() is called. */
1267 # define SvPVX_mutable(sv) ((sv)->sv_u.svu_pv)
1268 # define SvPVX_const(sv) ((const char*)((sv)->sv_u.svu_pv))
1271 #define SvIVXx(sv) SvIVX(sv)
1272 #define SvUVXx(sv) SvUVX(sv)
1273 #define SvNVXx(sv) SvNVX(sv)
1274 #define SvPVXx(sv) SvPVX(sv)
1275 #define SvLENx(sv) SvLEN(sv)
1276 #define SvENDx(sv) ((PL_Sv = (sv)), SvEND(PL_Sv))
1279 /* Ask a scalar nicely to try to become an IV, if possible.
1280 Not guaranteed to stay returning void */
1281 /* Macro won't actually call sv_2iv if already IOK */
1282 #define SvIV_please(sv) \
1283 STMT_START {if (!SvIOKp(sv) && (SvFLAGS(sv) & (SVf_NOK|SVf_POK))) \
1284 (void) SvIV(sv); } STMT_END
1285 #define SvIV_please_nomg(sv) \
1286 (!(SvFLAGS(sv) & (SVf_IOK|SVp_IOK)) && (SvFLAGS(sv) & (SVf_NOK|SVf_POK)) \
1287 ? (sv_2iv_flags(sv, 0), SvIOK(sv)) \
1289 #define SvIV_set(sv, val) \
1291 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1292 assert(!isGV_with_GP(sv)); \
1293 (((XPVIV*) SvANY(sv))->xiv_iv = (val)); } STMT_END
1294 #define SvNV_set(sv, val) \
1296 assert(PL_valid_types_NV_set[SvTYPE(sv) & SVt_MASK]); \
1297 assert(!isGV_with_GP(sv)); \
1298 (((XPVNV*)SvANY(sv))->xnv_u.xnv_nv = (val)); } STMT_END
1299 #define SvPV_set(sv, val) \
1301 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1302 assert(!isGV_with_GP(sv)); \
1303 assert(!(SvTYPE(sv) == SVt_PVIO \
1304 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1305 ((sv)->sv_u.svu_pv = (val)); } STMT_END
1306 #define SvUV_set(sv, val) \
1308 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1309 assert(!isGV_with_GP(sv)); \
1310 (((XPVUV*)SvANY(sv))->xuv_uv = (val)); } STMT_END
1311 #define SvRV_set(sv, val) \
1313 assert(PL_valid_types_RV[SvTYPE(sv) & SVt_MASK]); \
1314 assert(!isGV_with_GP(sv)); \
1315 assert(!(SvTYPE(sv) == SVt_PVIO \
1316 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1317 ((sv)->sv_u.svu_rv = (val)); } STMT_END
1318 #define SvMAGIC_set(sv, val) \
1319 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1320 (((XPVMG*)SvANY(sv))->xmg_u.xmg_magic = (val)); } STMT_END
1321 #define SvSTASH_set(sv, val) \
1322 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1323 (((XPVMG*) SvANY(sv))->xmg_stash = (val)); } STMT_END
1324 #define SvCUR_set(sv, val) \
1326 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK] \
1327 || SvTYPE(sv) == SVt_REGEXP); \
1328 assert(!isGV_with_GP(sv)); \
1329 assert(!(SvTYPE(sv) == SVt_PVIO \
1330 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1331 (((XPV*) SvANY(sv))->xpv_cur = (val)); } STMT_END
1332 #define SvLEN_set(sv, val) \
1334 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1335 assert(!isGV_with_GP(sv)); \
1336 assert(!(SvTYPE(sv) == SVt_PVIO \
1337 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1338 (((XPV*) SvANY(sv))->xpv_len = (val)); } STMT_END
1339 #define SvEND_set(sv, val) \
1340 STMT_START { assert(SvTYPE(sv) >= SVt_PV); \
1341 SvCUR_set(sv, (val) - SvPVX(sv)); } STMT_END
1343 #define SvPV_renew(sv,n) \
1344 STMT_START { SvLEN_set(sv, n); \
1345 SvPV_set((sv), (MEM_WRAP_CHECK_(n,char) \
1346 (char*)saferealloc((Malloc_t)SvPVX(sv), \
1347 (MEM_SIZE)((n))))); \
1350 #define SvPV_shrink_to_cur(sv) STMT_START { \
1351 const STRLEN _lEnGtH = SvCUR(sv) + 1; \
1352 SvPV_renew(sv, _lEnGtH); \
1355 #define SvPV_free(sv) \
1357 assert(SvTYPE(sv) >= SVt_PV); \
1359 assert(!SvROK(sv)); \
1360 if(UNLIKELY(SvOOK(sv))) { \
1362 SvOOK_offset(sv, zok); \
1363 SvPV_set(sv, SvPVX_mutable(sv) - zok); \
1364 SvFLAGS(sv) &= ~SVf_OOK; \
1366 Safefree(SvPVX(sv)); \
1371 /* Code that crops up in three places to take a scalar and ready it to hold
1373 # define prepare_SV_for_RV(sv) \
1375 if (SvTYPE(sv) < SVt_PV && SvTYPE(sv) != SVt_IV) \
1376 sv_upgrade(sv, SVt_IV); \
1377 else if (SvTYPE(sv) >= SVt_PV) { \
1386 # define BmFLAGS(sv) (SvTAIL(sv) ? FBMcf_TAIL : 0)
1389 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1390 # define BmUSEFUL(sv) \
1391 (*({ SV *const _bmuseful = MUTABLE_SV(sv); \
1392 assert(SvTYPE(_bmuseful) >= SVt_PVIV); \
1393 assert(SvVALID(_bmuseful)); \
1394 assert(!SvIOK(_bmuseful)); \
1395 &(((XPVIV*) SvANY(_bmuseful))->xiv_u.xivu_iv); \
1398 # define BmUSEFUL(sv) ((XPVIV*) SvANY(sv))->xiv_u.xivu_iv
1403 # define BmRARE(sv) 0
1404 # define BmPREVIOUS(sv) 0
1407 #define FmLINES(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1409 #define LvTYPE(sv) ((XPVLV*) SvANY(sv))->xlv_type
1410 #define LvTARG(sv) ((XPVLV*) SvANY(sv))->xlv_targ
1411 #define LvTARGOFF(sv) ((XPVLV*) SvANY(sv))->xlv_targoff
1412 #define LvSTARGOFF(sv) ((XPVLV*) SvANY(sv))->xlv_targoff_u.xlvu_stargoff
1413 #define LvTARGLEN(sv) ((XPVLV*) SvANY(sv))->xlv_targlen
1414 #define LvFLAGS(sv) ((XPVLV*) SvANY(sv))->xlv_flags
1416 #define IoIFP(sv) (sv)->sv_u.svu_fp
1417 #define IoOFP(sv) ((XPVIO*) SvANY(sv))->xio_ofp
1418 #define IoDIRP(sv) ((XPVIO*) SvANY(sv))->xio_dirp
1419 #define IoANY(sv) ((XPVIO*) SvANY(sv))->xio_any
1420 #define IoLINES(sv) ((XPVIO*) SvANY(sv))->xiv_u.xivu_iv
1421 #define IoPAGE(sv) ((XPVIO*) SvANY(sv))->xio_page
1422 #define IoPAGE_LEN(sv) ((XPVIO*) SvANY(sv))->xio_page_len
1423 #define IoLINES_LEFT(sv)((XPVIO*) SvANY(sv))->xio_lines_left
1424 #define IoTOP_NAME(sv) ((XPVIO*) SvANY(sv))->xio_top_name
1425 #define IoTOP_GV(sv) ((XPVIO*) SvANY(sv))->xio_top_gv
1426 #define IoFMT_NAME(sv) ((XPVIO*) SvANY(sv))->xio_fmt_name
1427 #define IoFMT_GV(sv) ((XPVIO*) SvANY(sv))->xio_fmt_gv
1428 #define IoBOTTOM_NAME(sv)((XPVIO*) SvANY(sv))->xio_bottom_name
1429 #define IoBOTTOM_GV(sv) ((XPVIO*) SvANY(sv))->xio_bottom_gv
1430 #define IoTYPE(sv) ((XPVIO*) SvANY(sv))->xio_type
1431 #define IoFLAGS(sv) ((XPVIO*) SvANY(sv))->xio_flags
1433 /* IoTYPE(sv) is a single character telling the type of I/O connection. */
1434 #define IoTYPE_RDONLY '<'
1435 #define IoTYPE_WRONLY '>'
1436 #define IoTYPE_RDWR '+'
1437 #define IoTYPE_APPEND 'a'
1438 #define IoTYPE_PIPE '|'
1439 #define IoTYPE_STD '-' /* stdin or stdout */
1440 #define IoTYPE_SOCKET 's'
1441 #define IoTYPE_CLOSED ' '
1442 #define IoTYPE_IMPLICIT 'I' /* stdin or stdout or stderr */
1443 #define IoTYPE_NUMERIC '#' /* fdopen */
1446 =for apidoc Am|bool|SvTAINTED|SV* sv
1447 Checks to see if an SV is tainted. Returns TRUE if it is, FALSE if
1450 =for apidoc Am|void|SvTAINTED_on|SV* sv
1451 Marks an SV as tainted if tainting is enabled.
1453 =for apidoc Am|void|SvTAINTED_off|SV* sv
1454 Untaints an SV. Be I<very> careful with this routine, as it short-circuits
1455 some of Perl's fundamental security features. XS module authors should not
1456 use this function unless they fully understand all the implications of
1457 unconditionally untainting the value. Untainting should be done in the
1458 standard perl fashion, via a carefully crafted regexp, rather than directly
1459 untainting variables.
1461 =for apidoc Am|void|SvTAINT|SV* sv
1462 Taints an SV if tainting is enabled, and if some input to the current
1463 expression is tainted--usually a variable, but possibly also implicit
1464 inputs such as locale settings. C<SvTAINT> propagates that taintedness to
1465 the outputs of an expression in a pessimistic fashion; i.e., without paying
1466 attention to precisely which outputs are influenced by which inputs.
1471 #define sv_taint(sv) sv_magic((sv), NULL, PERL_MAGIC_taint, NULL, 0)
1473 #ifdef NO_TAINT_SUPPORT
1474 # define SvTAINTED(sv) 0
1476 # define SvTAINTED(sv) (SvMAGICAL(sv) && sv_tainted(sv))
1478 #define SvTAINTED_on(sv) STMT_START{ if(UNLIKELY(TAINTING_get)){sv_taint(sv);} }STMT_END
1479 #define SvTAINTED_off(sv) STMT_START{ if(UNLIKELY(TAINTING_get)){sv_untaint(sv);} }STMT_END
1481 #define SvTAINT(sv) \
1483 assert(TAINTING_get || !TAINT_get); \
1484 if (UNLIKELY(TAINT_get)) \
1489 =for apidoc Am|char*|SvPV_force|SV* sv|STRLEN len
1490 Like C<SvPV> but will force the SV into containing a string (C<SvPOK>), and
1491 only a string (C<SvPOK_only>), by hook or by crook. You need force if you are
1492 going to update the C<SvPVX> directly. Processes get magic.
1494 Note that coercing an arbitrary scalar into a plain PV will potentially
1495 strip useful data from it. For example if the SV was C<SvROK>, then the
1496 referent will have its reference count decremented, and the SV itself may
1497 be converted to an C<SvPOK> scalar with a string buffer containing a value
1498 such as C<"ARRAY(0x1234)">.
1500 =for apidoc Am|char*|SvPV_force_nomg|SV* sv|STRLEN len
1501 Like C<SvPV_force>, but doesn't process get magic.
1503 =for apidoc Am|char*|SvPV|SV* sv|STRLEN len
1504 Returns a pointer to the string in the SV, or a stringified form of
1505 the SV if the SV does not contain a string. The SV may cache the
1506 stringified version becoming C<SvPOK>. Handles 'get' magic. The
1507 C<len> variable will be set to the length of the string (this is a macro, so
1508 don't use C<&len>). See also C<L</SvPVx>> for a version which guarantees to
1509 evaluate C<sv> only once.
1511 Note that there is no guarantee that the return value of C<SvPV()> is
1512 equal to C<SvPVX(sv)>, or that C<SvPVX(sv)> contains valid data, or that
1513 successive calls to C<SvPV(sv)> will return the same pointer value each
1514 time. This is due to the way that things like overloading and
1515 Copy-On-Write are handled. In these cases, the return value may point to
1516 a temporary buffer or similar. If you absolutely need the C<SvPVX> field to
1517 be valid (for example, if you intend to write to it), then see
1520 =for apidoc Am|char*|SvPVx|SV* sv|STRLEN len
1521 A version of C<SvPV> which guarantees to evaluate C<sv> only once.
1522 Only use this if C<sv> is an expression with side effects, otherwise use the
1523 more efficient C<SvPV>.
1525 =for apidoc Am|char*|SvPV_nomg|SV* sv|STRLEN len
1526 Like C<SvPV> but doesn't process magic.
1528 =for apidoc Am|char*|SvPV_nolen|SV* sv
1529 Like C<SvPV> but doesn't set a length variable.
1531 =for apidoc Am|char*|SvPV_nomg_nolen|SV* sv
1532 Like C<SvPV_nolen> but doesn't process magic.
1534 =for apidoc Am|IV|SvIV|SV* sv
1535 Coerces the given SV to an integer and returns it. See C<L</SvIVx>> for a
1536 version which guarantees to evaluate C<sv> only once.
1538 =for apidoc Am|IV|SvIV_nomg|SV* sv
1539 Like C<SvIV> but doesn't process magic.
1541 =for apidoc Am|IV|SvIVx|SV* sv
1542 Coerces the given SV to an integer and returns it.
1543 Guarantees to evaluate C<sv> only once. Only use
1544 this if C<sv> is an expression with side effects,
1545 otherwise use the more efficient C<SvIV>.
1547 =for apidoc Am|NV|SvNV|SV* sv
1548 Coerce the given SV to a double and return it. See C<L</SvNVx>> for a version
1549 which guarantees to evaluate C<sv> only once.
1551 =for apidoc Am|NV|SvNV_nomg|SV* sv
1552 Like C<SvNV> but doesn't process magic.
1554 =for apidoc Am|NV|SvNVx|SV* sv
1555 Coerces the given SV to a double and returns it.
1556 Guarantees to evaluate C<sv> only once. Only use
1557 this if C<sv> is an expression with side effects,
1558 otherwise use the more efficient C<SvNV>.
1560 =for apidoc Am|UV|SvUV|SV* sv
1561 Coerces the given SV to an unsigned integer and returns it. See C<L</SvUVx>>
1562 for a version which guarantees to evaluate C<sv> only once.
1564 =for apidoc Am|UV|SvUV_nomg|SV* sv
1565 Like C<SvUV> but doesn't process magic.
1567 =for apidoc Am|UV|SvUVx|SV* sv
1568 Coerces the given SV to an unsigned integer and
1569 returns it. Guarantees to evaluate C<sv> only once. Only
1570 use this if C<sv> is an expression with side effects,
1571 otherwise use the more efficient C<SvUV>.
1573 =for apidoc Am|bool|SvTRUE|SV* sv
1574 Returns a boolean indicating whether Perl would evaluate the SV as true or
1575 false. See C<L</SvOK>> for a defined/undefined test. Handles 'get' magic
1576 unless the scalar is already C<SvPOK>, C<SvIOK> or C<SvNOK> (the public, not the
1579 =for apidoc Am|bool|SvTRUE_nomg|SV* sv
1580 Returns a boolean indicating whether Perl would evaluate the SV as true or
1581 false. See C<L</SvOK>> for a defined/undefined test. Does not handle 'get' magic.
1583 =for apidoc Am|char*|SvPVutf8_force|SV* sv|STRLEN len
1584 Like C<SvPV_force>, but converts C<sv> to UTF-8 first if necessary.
1586 =for apidoc Am|char*|SvPVutf8|SV* sv|STRLEN len
1587 Like C<SvPV>, but converts C<sv> to UTF-8 first if necessary.
1589 =for apidoc Am|char*|SvPVutf8_nolen|SV* sv
1590 Like C<SvPV_nolen>, but converts C<sv> to UTF-8 first if necessary.
1592 =for apidoc Am|char*|SvPVbyte_force|SV* sv|STRLEN len
1593 Like C<SvPV_force>, but converts C<sv> to byte representation first if necessary.
1595 =for apidoc Am|char*|SvPVbyte|SV* sv|STRLEN len
1596 Like C<SvPV>, but converts C<sv> to byte representation first if necessary.
1598 =for apidoc Am|char*|SvPVbyte_nolen|SV* sv
1599 Like C<SvPV_nolen>, but converts C<sv> to byte representation first if necessary.
1601 =for apidoc Am|char*|SvPVutf8x_force|SV* sv|STRLEN len
1602 Like C<SvPV_force>, but converts C<sv> to UTF-8 first if necessary.
1603 Guarantees to evaluate C<sv> only once; use the more efficient C<SvPVutf8_force>
1606 =for apidoc Am|char*|SvPVutf8x|SV* sv|STRLEN len
1607 Like C<SvPV>, but converts C<sv> to UTF-8 first if necessary.
1608 Guarantees to evaluate C<sv> only once; use the more efficient C<SvPVutf8>
1611 =for apidoc Am|char*|SvPVbytex_force|SV* sv|STRLEN len
1612 Like C<SvPV_force>, but converts C<sv> to byte representation first if necessary.
1613 Guarantees to evaluate C<sv> only once; use the more efficient C<SvPVbyte_force>
1616 =for apidoc Am|char*|SvPVbytex|SV* sv|STRLEN len
1617 Like C<SvPV>, but converts C<sv> to byte representation first if necessary.
1618 Guarantees to evaluate C<sv> only once; use the more efficient C<SvPVbyte>
1621 =for apidoc Am|U32|SvIsCOW|SV* sv
1622 Returns a U32 value indicating whether the SV is Copy-On-Write (either shared
1623 hash key scalars, or full Copy On Write scalars if 5.9.0 is configured for
1626 =for apidoc Am|bool|SvIsCOW_shared_hash|SV* sv
1627 Returns a boolean indicating whether the SV is Copy-On-Write shared hash key
1630 =for apidoc Am|void|sv_catpvn_nomg|SV* sv|const char* ptr|STRLEN len
1631 Like C<sv_catpvn> but doesn't process magic.
1633 =for apidoc Am|void|sv_catpv_nomg|SV* sv|const char* ptr
1634 Like C<sv_catpv> but doesn't process magic.
1636 =for apidoc Am|void|sv_setsv_nomg|SV* dsv|SV* ssv
1637 Like C<sv_setsv> but doesn't process magic.
1639 =for apidoc Am|void|sv_catsv_nomg|SV* dsv|SV* ssv
1640 Like C<sv_catsv> but doesn't process magic.
1642 =for apidoc Amdb|STRLEN|sv_utf8_upgrade_nomg|NN SV *sv
1644 Like C<sv_utf8_upgrade>, but doesn't do magic on C<sv>.
1649 /* Let us hope that bitmaps for UV and IV are the same */
1650 #define SvIV(sv) (SvIOK_nog(sv) ? SvIVX(sv) : sv_2iv(sv))
1651 #define SvUV(sv) (SvUOK_nog(sv) ? SvUVX(sv) : sv_2uv(sv))
1652 #define SvNV(sv) (SvNOK_nog(sv) ? SvNVX(sv) : sv_2nv(sv))
1654 #define SvIV_nomg(sv) (SvIOK(sv) ? SvIVX(sv) : sv_2iv_flags(sv, 0))
1655 #define SvUV_nomg(sv) (SvIOK(sv) ? SvUVX(sv) : sv_2uv_flags(sv, 0))
1656 #define SvNV_nomg(sv) (SvNOK(sv) ? SvNVX(sv) : sv_2nv_flags(sv, 0))
1660 #define SvPV(sv, lp) SvPV_flags(sv, lp, SV_GMAGIC)
1661 #define SvPV_const(sv, lp) SvPV_flags_const(sv, lp, SV_GMAGIC)
1662 #define SvPV_mutable(sv, lp) SvPV_flags_mutable(sv, lp, SV_GMAGIC)
1664 #define SvPV_flags(sv, lp, flags) \
1666 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pv_flags(sv, &lp, flags))
1667 #define SvPV_flags_const(sv, lp, flags) \
1669 ? ((lp = SvCUR(sv)), SvPVX_const(sv)) : \
1670 (const char*) sv_2pv_flags(sv, &lp, (flags|SV_CONST_RETURN)))
1671 #define SvPV_flags_const_nolen(sv, flags) \
1673 ? SvPVX_const(sv) : \
1674 (const char*) sv_2pv_flags(sv, 0, (flags|SV_CONST_RETURN)))
1675 #define SvPV_flags_mutable(sv, lp, flags) \
1677 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) : \
1678 sv_2pv_flags(sv, &lp, (flags|SV_MUTABLE_RETURN)))
1680 #define SvPV_force(sv, lp) SvPV_force_flags(sv, lp, SV_GMAGIC)
1681 #define SvPV_force_nolen(sv) SvPV_force_flags_nolen(sv, SV_GMAGIC)
1682 #define SvPV_force_mutable(sv, lp) SvPV_force_flags_mutable(sv, lp, SV_GMAGIC)
1684 #define SvPV_force_nomg(sv, lp) SvPV_force_flags(sv, lp, 0)
1685 #define SvPV_force_nomg_nolen(sv) SvPV_force_flags_nolen(sv, 0)
1687 #define SvPV_force_flags(sv, lp, flags) \
1688 (SvPOK_pure_nogthink(sv) \
1689 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvn_force_flags(sv, &lp, flags))
1691 #define SvPV_force_flags_nolen(sv, flags) \
1692 (SvPOK_pure_nogthink(sv) \
1693 ? SvPVX(sv) : sv_pvn_force_flags(sv, 0, flags))
1695 #define SvPV_force_flags_mutable(sv, lp, flags) \
1696 (SvPOK_pure_nogthink(sv) \
1697 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) \
1698 : sv_pvn_force_flags(sv, &lp, flags|SV_MUTABLE_RETURN))
1700 #define SvPV_nolen(sv) \
1702 ? SvPVX(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC))
1704 /* "_nomg" in these defines means no mg_get() */
1705 #define SvPV_nomg_nolen(sv) \
1707 ? SvPVX(sv) : sv_2pv_flags(sv, 0, 0))
1709 #define SvPV_nolen_const(sv) \
1711 ? SvPVX_const(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC|SV_CONST_RETURN))
1713 #define SvPV_nomg(sv, lp) SvPV_flags(sv, lp, 0)
1714 #define SvPV_nomg_const(sv, lp) SvPV_flags_const(sv, lp, 0)
1715 #define SvPV_nomg_const_nolen(sv) SvPV_flags_const_nolen(sv, 0)
1719 #define SvPVutf8(sv, lp) \
1720 (SvPOK_utf8_nog(sv) \
1721 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvutf8(sv, &lp))
1723 #define SvPVutf8_force(sv, lp) \
1724 (SvPOK_utf8_pure_nogthink(sv) \
1725 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvutf8n_force(sv, &lp))
1727 #define SvPVutf8_nolen(sv) \
1728 (SvPOK_utf8_nog(sv) \
1729 ? SvPVX(sv) : sv_2pvutf8(sv, 0))
1733 #define SvPVbyte(sv, lp) \
1734 (SvPOK_byte_nog(sv) \
1735 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvbyte(sv, &lp))
1737 #define SvPVbyte_force(sv, lp) \
1738 (SvPOK_byte_pure_nogthink(sv) \
1739 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvbyten_force(sv, &lp))
1741 #define SvPVbyte_nolen(sv) \
1742 (SvPOK_byte_nog(sv) \
1743 ? SvPVX(sv) : sv_2pvbyte(sv, 0))
1746 /* define FOOx(): idempotent versions of FOO(). If possible, use a local
1747 * var to evaluate the arg once; failing that, use a global if possible;
1748 * failing that, call a function to do the work
1751 #define SvPVx_force(sv, lp) sv_pvn_force(sv, &lp)
1752 #define SvPVutf8x_force(sv, lp) sv_pvutf8n_force(sv, &lp)
1753 #define SvPVbytex_force(sv, lp) sv_pvbyten_force(sv, &lp)
1755 #define SvTRUE(sv) (LIKELY(sv) && (UNLIKELY(SvGMAGICAL(sv)) ? sv_2bool(sv) : SvTRUE_common(sv, sv_2bool_nomg(sv))))
1756 #define SvTRUE_nomg(sv) (LIKELY(sv) && ( SvTRUE_common(sv, sv_2bool_nomg(sv))))
1757 #define SvTRUE_NN(sv) (UNLIKELY(SvGMAGICAL(sv)) ? sv_2bool(sv) : SvTRUE_common(sv, sv_2bool_nomg(sv)))
1758 #define SvTRUE_nomg_NN(sv) ( SvTRUE_common(sv, sv_2bool_nomg(sv)))
1759 #define SvTRUE_common(sv,fallback) ( \
1764 : (SvFLAGS(sv) & (SVf_IOK|SVf_NOK)) \
1765 ? ( (SvIOK(sv) && SvIVX(sv) != 0) \
1766 || (SvNOK(sv) && SvNVX(sv) != 0.0)) \
1769 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1771 # define SvIVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvIV(_sv); })
1772 # define SvUVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvUV(_sv); })
1773 # define SvNVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvNV(_sv); })
1774 # define SvPVx(sv, lp) ({SV *_sv = (sv); SvPV(_sv, lp); })
1775 # define SvPVx_const(sv, lp) ({SV *_sv = (sv); SvPV_const(_sv, lp); })
1776 # define SvPVx_nolen(sv) ({SV *_sv = (sv); SvPV_nolen(_sv); })
1777 # define SvPVx_nolen_const(sv) ({SV *_sv = (sv); SvPV_nolen_const(_sv); })
1778 # define SvPVutf8x(sv, lp) ({SV *_sv = (sv); SvPVutf8(_sv, lp); })
1779 # define SvPVbytex(sv, lp) ({SV *_sv = (sv); SvPVbyte(_sv, lp); })
1780 # define SvPVbytex_nolen(sv) ({SV *_sv = (sv); SvPVbyte_nolen(_sv); })
1781 # define SvTRUEx(sv) ({SV *_sv = (sv); SvTRUE(_sv); })
1782 # define SvTRUEx_nomg(sv) ({SV *_sv = (sv); SvTRUE_nomg(_sv); })
1784 #else /* __GNUC__ */
1786 /* These inlined macros use globals, which will require a thread
1787 * declaration in user code, so we avoid them under threads */
1789 # define SvIVx(sv) ((PL_Sv = (sv)), SvIV(PL_Sv))
1790 # define SvUVx(sv) ((PL_Sv = (sv)), SvUV(PL_Sv))
1791 # define SvNVx(sv) ((PL_Sv = (sv)), SvNV(PL_Sv))
1792 # define SvPVx(sv, lp) ((PL_Sv = (sv)), SvPV(PL_Sv, lp))
1793 # define SvPVx_const(sv, lp) ((PL_Sv = (sv)), SvPV_const(PL_Sv, lp))
1794 # define SvPVx_nolen(sv) ((PL_Sv = (sv)), SvPV_nolen(PL_Sv))
1795 # define SvPVx_nolen_const(sv) ((PL_Sv = (sv)), SvPV_nolen_const(PL_Sv))
1796 # define SvPVutf8x(sv, lp) ((PL_Sv = (sv)), SvPVutf8(PL_Sv, lp))
1797 # define SvPVbytex(sv, lp) ((PL_Sv = (sv)), SvPVbyte(PL_Sv, lp))
1798 # define SvPVbytex_nolen(sv) ((PL_Sv = (sv)), SvPVbyte_nolen(PL_Sv))
1799 # define SvTRUEx(sv) ((PL_Sv = (sv)), SvTRUE(PL_Sv))
1800 # define SvTRUEx_nomg(sv) ((PL_Sv = (sv)), SvTRUE_nomg(PL_Sv))
1801 #endif /* __GNU__ */
1803 #define SvPVXtrue(sv) ( \
1804 ((XPV*)SvANY((sv))) \
1806 ((XPV*)SvANY((sv)))->xpv_cur > 1 \
1808 ((XPV*)SvANY((sv)))->xpv_cur \
1809 && *(sv)->sv_u.svu_pv != '0' \
1814 #define SvIsCOW(sv) (SvFLAGS(sv) & SVf_IsCOW)
1815 #define SvIsCOW_on(sv) (SvFLAGS(sv) |= SVf_IsCOW)
1816 #define SvIsCOW_off(sv) (SvFLAGS(sv) &= ~SVf_IsCOW)
1817 #define SvIsCOW_shared_hash(sv) (SvIsCOW(sv) && SvLEN(sv) == 0)
1819 #define SvSHARED_HEK_FROM_PV(pvx) \
1820 ((struct hek*)(pvx - STRUCT_OFFSET(struct hek, hek_key)))
1821 #define SvSHARED_HASH(sv) (0 + SvSHARED_HEK_FROM_PV(SvPVX_const(sv))->hek_hash)
1823 /* flag values for sv_*_flags functions */
1824 #define SV_IMMEDIATE_UNREF 1
1826 #define SV_COW_DROP_PV 4
1827 #define SV_UTF8_NO_ENCODING 8
1828 #define SV_NOSTEAL 16
1829 #define SV_CONST_RETURN 32
1830 #define SV_MUTABLE_RETURN 64
1831 #define SV_SMAGIC 128
1832 #define SV_HAS_TRAILING_NUL 256
1833 #define SV_COW_SHARED_HASH_KEYS 512
1834 /* This one is only enabled for PERL_OLD_COPY_ON_WRITE */
1835 /* XXX This flag actually enabled for any COW. But it appears not to do
1836 anything. Can we just remove it? Or will it serve some future
1838 #define SV_COW_OTHER_PVS 1024
1839 /* Make sv_2pv_flags return NULL if something is undefined. */
1840 #define SV_UNDEF_RETURNS_NULL 2048
1841 /* Tell sv_utf8_upgrade() to not check to see if an upgrade is really needed.
1842 * This is used when the caller has already determined it is, and avoids
1844 #define SV_FORCE_UTF8_UPGRADE 4096
1845 /* if (after resolving magic etc), the SV is found to be overloaded,
1846 * don't call the overload magic, just return as-is */
1847 #define SV_SKIP_OVERLOAD 8192
1848 #define SV_CATBYTES 16384
1849 #define SV_CATUTF8 32768
1851 /* The core is safe for this COW optimisation. XS code on CPAN may not be.
1852 So only default to doing the COW setup if we're in the core.
1855 # ifndef SV_DO_COW_SVSETSV
1856 # define SV_DO_COW_SVSETSV SV_COW_SHARED_HASH_KEYS|SV_COW_OTHER_PVS
1860 #ifndef SV_DO_COW_SVSETSV
1861 # define SV_DO_COW_SVSETSV 0
1865 #define sv_unref(sv) sv_unref_flags(sv, 0)
1866 #define sv_force_normal(sv) sv_force_normal_flags(sv, 0)
1867 #define sv_usepvn(sv, p, l) sv_usepvn_flags(sv, p, l, 0)
1868 #define sv_usepvn_mg(sv, p, l) sv_usepvn_flags(sv, p, l, SV_SMAGIC)
1870 /* We are about to replace the SV's current value. So if it's copy on write
1871 we need to normalise it. Use the SV_COW_DROP_PV flag hint to say that
1872 the value is about to get thrown away, so drop the PV rather than go to
1873 the effort of making a read-write copy only for it to get immediately
1876 #define SV_CHECK_THINKFIRST_COW_DROP(sv) if (SvTHINKFIRST(sv)) \
1877 sv_force_normal_flags(sv, SV_COW_DROP_PV)
1879 #ifdef PERL_COPY_ON_WRITE
1880 # define SvCANCOW(sv) \
1882 ? SvLEN(sv) ? CowREFCNT(sv) != SV_COW_REFCNT_MAX : 1 \
1883 : (SvFLAGS(sv) & CAN_COW_MASK) == CAN_COW_FLAGS \
1884 && SvCUR(sv)+1 < SvLEN(sv))
1885 /* Note: To allow 256 COW "copies", a refcnt of 0 means 1. */
1886 # define CowREFCNT(sv) (*(U8 *)(SvPVX(sv)+SvLEN(sv)-1))
1887 # define SV_COW_REFCNT_MAX ((1 << sizeof(U8)*8) - 1)
1888 # define CAN_COW_MASK (SVf_POK|SVf_ROK|SVp_POK|SVf_FAKE| \
1889 SVf_OOK|SVf_BREAK|SVf_READONLY|SVf_PROTECT)
1892 #define CAN_COW_FLAGS (SVp_POK|SVf_POK)
1894 #define SV_CHECK_THINKFIRST(sv) if (SvTHINKFIRST(sv)) \
1895 sv_force_normal_flags(sv, 0)
1898 /* all these 'functions' are now just macros */
1900 #define sv_pv(sv) SvPV_nolen(sv)
1901 #define sv_pvutf8(sv) SvPVutf8_nolen(sv)
1902 #define sv_pvbyte(sv) SvPVbyte_nolen(sv)
1904 #define sv_pvn_force_nomg(sv, lp) sv_pvn_force_flags(sv, lp, 0)
1905 #define sv_utf8_upgrade_flags(sv, flags) sv_utf8_upgrade_flags_grow(sv, flags, 0)
1906 #define sv_utf8_upgrade_nomg(sv) sv_utf8_upgrade_flags(sv, 0)
1907 #define sv_catpvn_nomg(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, 0)
1908 #define sv_catpv_nomg(dsv, sstr) sv_catpv_flags(dsv, sstr, 0)
1909 #define sv_setsv(dsv, ssv) \
1910 sv_setsv_flags(dsv, ssv, SV_GMAGIC|SV_DO_COW_SVSETSV)
1911 #define sv_setsv_nomg(dsv, ssv) sv_setsv_flags(dsv, ssv, SV_DO_COW_SVSETSV)
1912 #define sv_catsv(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC)
1913 #define sv_catsv_nomg(dsv, ssv) sv_catsv_flags(dsv, ssv, 0)
1914 #define sv_catsv_mg(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC|SV_SMAGIC)
1915 #define sv_catpvn(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, SV_GMAGIC)
1916 #define sv_catpvn_mg(sv, sstr, slen) sv_catpvn_flags(sv, sstr, slen, SV_GMAGIC|SV_SMAGIC);
1917 #define sv_copypv(dsv, ssv) sv_copypv_flags(dsv, ssv, SV_GMAGIC)
1918 #define sv_copypv_nomg(dsv, ssv) sv_copypv_flags(dsv, ssv, 0)
1919 #define sv_2pv(sv, lp) sv_2pv_flags(sv, lp, SV_GMAGIC)
1920 #define sv_2pv_nolen(sv) sv_2pv(sv, 0)
1921 #define sv_2pvbyte_nolen(sv) sv_2pvbyte(sv, 0)
1922 #define sv_2pvutf8_nolen(sv) sv_2pvutf8(sv, 0)
1923 #define sv_2pv_nomg(sv, lp) sv_2pv_flags(sv, lp, 0)
1924 #define sv_pvn_force(sv, lp) sv_pvn_force_flags(sv, lp, SV_GMAGIC)
1925 #define sv_utf8_upgrade(sv) sv_utf8_upgrade_flags(sv, SV_GMAGIC)
1926 #define sv_2iv(sv) sv_2iv_flags(sv, SV_GMAGIC)
1927 #define sv_2uv(sv) sv_2uv_flags(sv, SV_GMAGIC)
1928 #define sv_2nv(sv) sv_2nv_flags(sv, SV_GMAGIC)
1929 #define sv_eq(sv1, sv2) sv_eq_flags(sv1, sv2, SV_GMAGIC)
1930 #define sv_cmp(sv1, sv2) sv_cmp_flags(sv1, sv2, SV_GMAGIC)
1931 #define sv_cmp_locale(sv1, sv2) sv_cmp_locale_flags(sv1, sv2, SV_GMAGIC)
1932 #define sv_collxfrm(sv, nxp) sv_cmp_flags(sv, nxp, SV_GMAGIC)
1933 #define sv_2bool(sv) sv_2bool_flags(sv, SV_GMAGIC)
1934 #define sv_2bool_nomg(sv) sv_2bool_flags(sv, 0)
1935 #define sv_insert(bigstr, offset, len, little, littlelen) \
1936 Perl_sv_insert_flags(aTHX_ (bigstr),(offset), (len), (little), \
1937 (littlelen), SV_GMAGIC)
1938 #define sv_mortalcopy(sv) \
1939 Perl_sv_mortalcopy_flags(aTHX_ sv, SV_GMAGIC|SV_DO_COW_SVSETSV)
1940 #define sv_cathek(sv,hek) \
1942 HEK * const bmxk = hek; \
1943 sv_catpvn_flags(sv, HEK_KEY(bmxk), HEK_LEN(bmxk), \
1944 HEK_UTF8(bmxk) ? SV_CATUTF8 : SV_CATBYTES); \
1947 /* Should be named SvCatPVN_utf8_upgrade? */
1948 #define sv_catpvn_nomg_utf8_upgrade(dsv, sstr, slen, nsv) \
1951 nsv = newSVpvn_flags(sstr, slen, SVs_TEMP); \
1953 sv_setpvn(nsv, sstr, slen); \
1955 sv_utf8_upgrade(nsv); \
1956 sv_catsv_nomg(dsv, nsv); \
1958 #define sv_catpvn_nomg_maybeutf8(dsv, sstr, slen, is_utf8) \
1959 sv_catpvn_flags(dsv, sstr, slen, (is_utf8)?SV_CATUTF8:SV_CATBYTES)
1961 #if defined(PERL_CORE) || defined(PERL_EXT)
1962 # define sv_or_pv_len_utf8(sv, pv, bytelen) \
1964 ? utf8_length((U8 *)(pv), (U8 *)(pv)+(bytelen)) \
1969 =for apidoc Am|SV*|newRV_inc|SV* sv
1971 Creates an RV wrapper for an SV. The reference count for the original SV is
1977 #define newRV_inc(sv) newRV(sv)
1979 /* the following macros update any magic values this C<sv> is associated with */
1982 =head1 Magical Functions
1984 =for apidoc Am|void|SvGETMAGIC|SV* sv
1985 Invokes C<mg_get> on an SV if it has 'get' magic. For example, this
1986 will call C<FETCH> on a tied variable. This macro evaluates its
1987 argument more than once.
1989 =for apidoc Am|void|SvSETMAGIC|SV* sv
1990 Invokes C<mg_set> on an SV if it has 'set' magic. This is necessary
1991 after modifying a scalar, in case it is a magical variable like C<$|>
1992 or a tied variable (it calls C<STORE>). This macro evaluates its
1993 argument more than once.
1995 =for apidoc Am|void|SvSetSV|SV* dsv|SV* ssv
1996 Calls C<sv_setsv> if C<dsv> is not the same as C<ssv>. May evaluate arguments
1997 more than once. Does not handle 'set' magic on the destination SV.
1999 =for apidoc Am|void|SvSetSV_nosteal|SV* dsv|SV* ssv
2000 Calls a non-destructive version of C<sv_setsv> if C<dsv> is not the same as
2001 C<ssv>. May evaluate arguments more than once.
2003 =for apidoc Am|void|SvSetMagicSV|SV* dsv|SV* ssv
2004 Like C<SvSetSV>, but does any set magic required afterwards.
2006 =for apidoc Am|void|SvSetMagicSV_nosteal|SV* dsv|SV* ssv
2007 Like C<SvSetSV_nosteal>, but does any set magic required afterwards.
2009 =for apidoc Am|void|SvSHARE|SV* sv
2010 Arranges for C<sv> to be shared between threads if a suitable module
2013 =for apidoc Am|void|SvLOCK|SV* sv
2014 Arranges for a mutual exclusion lock to be obtained on C<sv> if a suitable module
2017 =for apidoc Am|void|SvUNLOCK|SV* sv
2018 Releases a mutual exclusion lock on C<sv> if a suitable module
2021 =head1 SV Manipulation Functions
2023 =for apidoc Am|char *|SvGROW|SV* sv|STRLEN len
2024 Expands the character buffer in the SV so that it has room for the
2025 indicated number of bytes (remember to reserve space for an extra trailing
2026 C<NUL> character). Calls C<sv_grow> to perform the expansion if necessary.
2027 Returns a pointer to the character
2028 buffer. SV must be of type >= C<SVt_PV>. One
2029 alternative is to call C<sv_grow> if you are not sure of the type of SV.
2031 =for apidoc Am|char *|SvPVCLEAR|SV* sv
2032 Ensures that sv is a SVt_PV and that its SvCUR is 0, and that it is
2033 properly null terminated. Equivalent to sv_setpvs(""), but more efficient.
2038 #define SvPVCLEAR(sv) sv_setpv_bufsize(sv,0,0)
2039 #define SvSHARE(sv) PL_sharehook(aTHX_ sv)
2040 #define SvLOCK(sv) PL_lockhook(aTHX_ sv)
2041 #define SvUNLOCK(sv) PL_unlockhook(aTHX_ sv)
2042 #define SvDESTROYABLE(sv) PL_destroyhook(aTHX_ sv)
2044 #define SvGETMAGIC(x) ((void)(UNLIKELY(SvGMAGICAL(x)) && mg_get(x)))
2045 #define SvSETMAGIC(x) STMT_START { if (UNLIKELY(SvSMAGICAL(x))) mg_set(x); } STMT_END
2047 #define SvSetSV_and(dst,src,finally) \
2049 if (LIKELY((dst) != (src))) { \
2050 sv_setsv(dst, src); \
2054 #define SvSetSV_nosteal_and(dst,src,finally) \
2056 if (LIKELY((dst) != (src))) { \
2057 sv_setsv_flags(dst, src, SV_GMAGIC | SV_NOSTEAL | SV_DO_COW_SVSETSV); \
2062 #define SvSetSV(dst,src) \
2063 SvSetSV_and(dst,src,/*nothing*/;)
2064 #define SvSetSV_nosteal(dst,src) \
2065 SvSetSV_nosteal_and(dst,src,/*nothing*/;)
2067 #define SvSetMagicSV(dst,src) \
2068 SvSetSV_and(dst,src,SvSETMAGIC(dst))
2069 #define SvSetMagicSV_nosteal(dst,src) \
2070 SvSetSV_nosteal_and(dst,src,SvSETMAGIC(dst))
2073 #if !defined(SKIP_DEBUGGING)
2074 #define SvPEEK(sv) sv_peek(sv)
2076 #define SvPEEK(sv) ""
2079 #define SvIMMORTAL(sv) (SvREADONLY(sv) && ((sv)==&PL_sv_undef || (sv)==&PL_sv_yes || (sv)==&PL_sv_no || (sv)==&PL_sv_placeholder))
2082 /* exercise the immortal resurrection code in sv_free2() */
2083 # define SvREFCNT_IMMORTAL 1000
2085 # define SvREFCNT_IMMORTAL ((~(U32)0)/2)
2089 =for apidoc Am|SV *|boolSV|bool b
2091 Returns a true SV if C<b> is a true value, or a false SV if C<b> is 0.
2093 See also C<L</PL_sv_yes>> and C<L</PL_sv_no>>.
2098 #define boolSV(b) ((b) ? &PL_sv_yes : &PL_sv_no)
2100 #define isGV(sv) (SvTYPE(sv) == SVt_PVGV)
2101 /* If I give every macro argument a different name, then there won't be bugs
2102 where nested macros get confused. Been there, done that. */
2103 #define isGV_with_GP(pwadak) \
2104 (((SvFLAGS(pwadak) & (SVp_POK|SVpgv_GP)) == SVpgv_GP) \
2105 && (SvTYPE(pwadak) == SVt_PVGV || SvTYPE(pwadak) == SVt_PVLV))
2106 #define isGV_with_GP_on(sv) STMT_START { \
2107 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
2108 assert (!SvPOKp(sv)); \
2109 assert (!SvIOKp(sv)); \
2110 (SvFLAGS(sv) |= SVpgv_GP); \
2112 #define isGV_with_GP_off(sv) STMT_START { \
2113 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
2114 assert (!SvPOKp(sv)); \
2115 assert (!SvIOKp(sv)); \
2116 (SvFLAGS(sv) &= ~SVpgv_GP); \
2118 #define isREGEXP(sv) \
2119 (SvTYPE(sv) == SVt_REGEXP \
2120 || (SvFLAGS(sv) & (SVTYPEMASK|SVp_POK|SVpgv_GP|SVf_FAKE)) \
2121 == (SVt_PVLV|SVf_FAKE))
2125 # define SvGROW(sv,len) \
2126 (SvIsCOW(sv) || SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
2128 # define SvGROW(sv,len) (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
2130 #define SvGROW_mutable(sv,len) \
2131 (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX_mutable(sv))
2132 #define Sv_Grow sv_grow
2134 #define CLONEf_COPY_STACKS 1
2135 #define CLONEf_KEEP_PTR_TABLE 2
2136 #define CLONEf_CLONE_HOST 4
2137 #define CLONEf_JOIN_IN 8
2139 struct clone_params {
2142 PerlInterpreter *proto_perl;
2143 PerlInterpreter *new_perl;
2148 =for apidoc Am|SV*|newSVpvn_utf8|NULLOK const char* s|STRLEN len|U32 utf8
2150 Creates a new SV and copies a string (which may contain C<NUL> (C<\0>)
2151 characters) into it. If C<utf8> is true, calls
2152 C<SvUTF8_on> on the new SV. Implemented as a wrapper around C<newSVpvn_flags>.
2157 #define newSVpvn_utf8(s, len, u) newSVpvn_flags((s), (len), (u) ? SVf_UTF8 : 0)
2160 =for apidoc Amx|SV*|newSVpadname|PADNAME *pn
2162 Creates a new SV containing the pad name.
2167 #define newSVpadname(pn) newSVpvn_utf8(PadnamePV(pn), PadnameLEN(pn), TRUE)
2170 =for apidoc Am|void|SvOOK_offset|NN SV*sv|STRLEN len
2172 Reads into C<len> the offset from C<SvPVX> back to the true start of the
2173 allocated buffer, which will be non-zero if C<sv_chop> has been used to
2174 efficiently remove characters from start of the buffer. Implemented as a
2175 macro, which takes the address of C<len>, which must be of type C<STRLEN>.
2176 Evaluates C<sv> more than once. Sets C<len> to 0 if C<SvOOK(sv)> is false.
2182 /* Does the bot know something I don't?
2183 10:28 <@Nicholas> metabatman
2184 10:28 <+meta> Nicholas: crash
2186 # define SvOOK_offset(sv, offset) STMT_START { \
2187 assert(sizeof(offset) == sizeof(STRLEN)); \
2189 const U8 *_crash = (U8*)SvPVX_const(sv); \
2190 (offset) = *--_crash; \
2192 _crash -= sizeof(STRLEN); \
2193 Copy(_crash, (U8 *)&(offset), sizeof(STRLEN), U8); \
2196 /* Validate the preceding buffer's sentinels to \
2197 verify that no-one is using it. */ \
2198 const U8 *const _bonk = (U8*)SvPVX_const(sv) - (offset);\
2199 while (_crash > _bonk) { \
2201 assert (*_crash == (U8)PTR2UV(_crash)); \
2209 /* This is the same code, but avoids using any temporary variables: */
2210 # define SvOOK_offset(sv, offset) STMT_START { \
2211 assert(sizeof(offset) == sizeof(STRLEN)); \
2213 (offset) = ((U8*)SvPVX_const(sv))[-1]; \
2215 Copy(SvPVX_const(sv) - 1 - sizeof(STRLEN), \
2216 (U8*)&(offset), sizeof(STRLEN), U8); \
2224 #define newIO() MUTABLE_IO(newSV_type(SVt_PVIO))
2226 #define SV_CONST(name) \
2227 PL_sv_consts[SV_CONST_##name] \
2228 ? PL_sv_consts[SV_CONST_##name] \
2229 : (PL_sv_consts[SV_CONST_##name] = newSVpv_share(#name, 0))
2231 #define SV_CONST_TIESCALAR 0
2232 #define SV_CONST_TIEARRAY 1
2233 #define SV_CONST_TIEHASH 2
2234 #define SV_CONST_TIEHANDLE 3
2236 #define SV_CONST_FETCH 4
2237 #define SV_CONST_FETCHSIZE 5
2238 #define SV_CONST_STORE 6
2239 #define SV_CONST_STORESIZE 7
2240 #define SV_CONST_EXISTS 8
2242 #define SV_CONST_PUSH 9
2243 #define SV_CONST_POP 10
2244 #define SV_CONST_SHIFT 11
2245 #define SV_CONST_UNSHIFT 12
2246 #define SV_CONST_SPLICE 13
2247 #define SV_CONST_EXTEND 14
2249 #define SV_CONST_FIRSTKEY 15
2250 #define SV_CONST_NEXTKEY 16
2251 #define SV_CONST_SCALAR 17
2253 #define SV_CONST_OPEN 18
2254 #define SV_CONST_WRITE 19
2255 #define SV_CONST_PRINT 20
2256 #define SV_CONST_PRINTF 21
2257 #define SV_CONST_READ 22
2258 #define SV_CONST_READLINE 23
2259 #define SV_CONST_GETC 24
2260 #define SV_CONST_SEEK 25
2261 #define SV_CONST_TELL 26
2262 #define SV_CONST_EOF 27
2263 #define SV_CONST_BINMODE 28
2264 #define SV_CONST_FILENO 29
2265 #define SV_CONST_CLOSE 30
2267 #define SV_CONST_DELETE 31
2268 #define SV_CONST_CLEAR 32
2269 #define SV_CONST_UNTIE 33
2270 #define SV_CONST_DESTROY 34
2272 #define SV_CONSTS_COUNT 35
2275 * Bodyless IVs and NVs!
2277 * Since 5.9.2, we can avoid allocating a body for SVt_IV-type SVs.
2278 * Since the larger IV-holding variants of SVs store their integer
2279 * values in their respective bodies, the family of SvIV() accessor
2280 * macros would naively have to branch on the SV type to find the
2281 * integer value either in the HEAD or BODY. In order to avoid this
2282 * expensive branch, a clever soul has deployed a great hack:
2283 * We set up the SvANY pointer such that instead of pointing to a
2284 * real body, it points into the memory before the location of the
2285 * head. We compute this pointer such that the location of
2286 * the integer member of the hypothetical body struct happens to
2287 * be the same as the location of the integer member of the bodyless
2288 * SV head. This now means that the SvIV() family of accessors can
2289 * always read from the (hypothetical or real) body via SvANY.
2291 * Since the 5.21 dev series, we employ the same trick for NVs
2292 * if the architecture can support it (NVSIZE <= IVSIZE).
2295 /* The following two macros compute the necessary offsets for the above
2296 * trick and store them in SvANY for SvIV() (and friends) to use. */
2299 # define SET_SVANY_FOR_BODYLESS_IV(sv) \
2300 SvANY(sv) = (XPVIV*)((char*)&(sv->sv_u.svu_iv) \
2301 - STRUCT_OFFSET(XPVIV, xiv_iv))
2303 # define SET_SVANY_FOR_BODYLESS_NV(sv) \
2304 SvANY(sv) = (XPVNV*)((char*)&(sv->sv_u.svu_nv) \
2305 - STRUCT_OFFSET(XPVNV, xnv_u.xnv_nv))
2309 * ex: set ts=8 sts=4 sw=4 et:
https://perl5.git.perl.org / perl5.git / blob