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 /* method name is DOES */
373 /* eval cx text is ref counted */
374 #define SVphv_CLONEABLE SVp_SCREAM /* PVHV (stashes) clone its objects */
375 #define SVpgv_GP SVp_SCREAM /* GV has a valid GP */
376 #define SVprv_PCS_IMPORTED SVp_SCREAM /* RV is a proxy for a constant
377 subroutine in another package. Set the
378 GvIMPORTED_CV_on() if it needs to be
379 expanded to a real GV */
380 #define SVf_PROTECT 0x00010000 /* very read-only */
381 #define SVs_PADTMP 0x00020000 /* in use as tmp */
382 #define SVs_PADSTALE 0x00040000 /* lexical has gone out of scope;
383 only used when !PADTMP */
384 #define SVs_TEMP 0x00080000 /* mortal (implies string is stealable) */
385 #define SVs_OBJECT 0x00100000 /* is "blessed" */
386 #define SVs_GMG 0x00200000 /* has magical get method */
387 #define SVs_SMG 0x00400000 /* has magical set method */
388 #define SVs_RMG 0x00800000 /* has random magical methods */
390 #define SVf_FAKE 0x01000000 /* 0: glob is just a copy
391 1: SV head arena wasn't malloc()ed
392 2: For PVCV, whether CvUNIQUE(cv)
393 refers to an eval or once only
394 [CvEVAL(cv), CvSPECIAL(cv)]
395 3: HV: informally reserved by DAPM
397 #define SVf_OOK 0x02000000 /* has valid offset value. For a PVHV this
398 means that a hv_aux struct is present
399 after the main array */
400 #define SVf_BREAK 0x04000000 /* refcnt is artificially low - used by
401 SVs in final arena cleanup.
402 Set in S_regtry on PL_reg_curpm, so that
403 perl_destruct will skip it.
404 Used for mark and sweep by OP_AASSIGN
406 #define SVf_READONLY 0x08000000 /* may not be modified */
411 #define SVf_THINKFIRST (SVf_READONLY|SVf_PROTECT|SVf_ROK|SVf_FAKE \
414 #define SVf_OK (SVf_IOK|SVf_NOK|SVf_POK|SVf_ROK| \
415 SVp_IOK|SVp_NOK|SVp_POK|SVpgv_GP)
417 #define PRIVSHIFT 4 /* (SVp_?OK >> PRIVSHIFT) == SVf_?OK */
419 /* Note that SVf_AMAGIC is now only set on stashes. */
420 #define SVf_AMAGIC 0x10000000 /* has magical overloaded methods */
421 #define SVf_IsCOW 0x10000000 /* copy on write (shared hash key if
424 /* Ensure this value does not clash with the GV_ADD* flags in gv.h, or the
425 CV_CKPROTO_* flags in op.c, or the padadd_* flags in pad.h: */
426 #define SVf_UTF8 0x20000000 /* SvPV is UTF-8 encoded
427 This is also set on RVs whose overloaded
428 stringification is UTF-8. This might
429 only happen as a side effect of SvPV() */
431 #define SVphv_SHAREKEYS 0x20000000 /* PVHV keys live on shared string table */
433 /* PVAV could probably use 0x2000000 without conflict. I assume that PVFM can
434 be UTF-8 encoded, and PVCVs could well have UTF-8 prototypes. PVIOs haven't
435 been restructured, so sometimes get used as string buffers. */
438 /* Some private flags. */
441 /* The SVp_SCREAM|SVpbm_VALID (0x40008000) combination is up for grabs.
442 Formerly it was used for pad names, but now it is available. The core
443 is careful to avoid setting both flags.
445 SVf_POK, SVp_POK also set:
447 0x0000C400 method name for DOES (SvSCREAM)
448 0x40004400 FBM compiled (SvVALID)
449 0x4000C400 *** Formerly used for pad names ***
451 0x00008000 GV with GP
452 0x00008800 RV with PCS imported
455 #define SVpav_REAL 0x40000000 /* free old entries */
457 #define SVphv_LAZYDEL 0x40000000 /* entry in xhv_eiter must be deleted */
458 /* This is only set true on a PVGV when it's playing "PVBM", but is tested for
459 on any regular scalar (anything <= PVLV) */
460 #define SVpbm_VALID 0x40000000
461 /* Only used in toke.c on an SV stored in PL_lex_repl */
462 #define SVrepl_EVAL 0x40000000 /* Replacement part of s///e */
464 /* IV, PVIV, PVNV, PVMG, PVGV and (I assume) PVLV */
465 #define SVf_IVisUV 0x80000000 /* use XPVUV instead of XPVIV */
467 #define SVpav_REIFY 0x80000000 /* can become real */
469 #define SVphv_HASKFLAGS 0x80000000 /* keys have flag byte after hash */
470 /* PVGV when SVpbm_VALID is true */
471 #define SVpbm_TAIL 0x80000000 /* string has a fake "\n" appended */
472 /* RV upwards. However, SVf_ROK and SVp_IOK are exclusive */
473 #define SVprv_WEAKREF 0x80000000 /* Weak reference */
474 /* pad name vars only */
477 HV* xmg_stash; /* class package */ \
479 STRLEN xpv_cur; /* length of svu_pv as a C string */ \
481 STRLEN xpvlenu_len; /* allocated size */ \
482 char * xpvlenu_pv; /* regexp string */ \
485 #define xpv_len xpv_len_u.xpvlenu_len
488 NV xnv_nv; /* numeric value, if any */
490 line_t xnv_lines; /* used internally by S_scan_subst() */
494 IV xivu_iv; /* integer value */
496 HEK * xivu_namehek; /* xpvlv, xpvgv: GvNAME */
500 MAGIC* xmg_magic; /* linked list of magicalness */
501 STRLEN xmg_hash_index; /* used while freeing hash entries */
513 #define xiv_iv xiv_u.xivu_iv
520 #define xuv_uv xuv_u.xivu_uv
528 /* This structure must match the beginning of struct xpvhv in hv.h. */
541 SSize_t xlvu_stargoff;
545 char xlv_type; /* k=keys .=pos x=substr v=vec /=join/re
546 * y=alem/helem/iter t=tie T=tied HE */
547 char xlv_flags; /* 1 = negative offset 2 = negative len */
550 #define xlv_targoff xlv_targoff_u.xlvu_targoff
554 IV prev_index; /* caches result of previous invlist_search() */
555 STRLEN iterator; /* Stores where we are in iterating */
556 bool is_offset; /* The data structure for all inversion lists
557 begins with an element for code point U+0000.
558 If this bool is set, the actual list contains
559 that 0; otherwise, the list actually begins
560 with the following element. Thus to invert
561 the list, merely toggle this flag */
564 /* This structure works in 3 ways - regular scalar, GV with GP, or fast
572 typedef U32 cv_flags_t;
574 #define _XPVCV_COMMON \
582 void (*xcv_xsub) (pTHX_ CV*); \
590 PADLIST * xcv_padlist; \
594 U32 xcv_outside_seq; /* the COP sequence (at the point of our \
595 * compilation) in the lexically enclosing \
597 cv_flags_t xcv_flags; \
598 I32 xcv_depth /* >= 2 indicates recursive call */
600 /* This structure must match XPVCV in cv.h */
611 /* ifp and ofp are normally the same, but sockets need separate streams */
613 /* Cray addresses everything by word boundaries (64 bits) and
614 * code and data pointers cannot be mixed (which is exactly what
615 * Perl_filter_add() tries to do with the dirp), hence the
616 * following union trick (as suggested by Gurusamy Sarathy).
617 * For further information see Geir Johansen's problem report
618 * titled [ID 20000612.002 (#3366)] Perl problem on Cray system
619 * The any pointer (known as IoANY()) will also be a good place
620 * to hang any IO disciplines to.
623 DIR * xiou_dirp; /* for opendir, readdir, etc */
624 void * xiou_any; /* for alignment */
626 /* IV xio_lines is now in IVX $. */
627 IV xio_page; /* $% */
628 IV xio_page_len; /* $= */
629 IV xio_lines_left; /* $- */
630 char * xio_top_name; /* $^ */
631 GV * xio_top_gv; /* $^ */
632 char * xio_fmt_name; /* $~ */
633 GV * xio_fmt_gv; /* $~ */
634 char * xio_bottom_name;/* $^B */
635 GV * xio_bottom_gv; /* $^B */
640 #define xio_dirp xio_dirpu.xiou_dirp
641 #define xio_any xio_dirpu.xiou_any
643 #define IOf_ARGV 1 /* this fp iterates over ARGV */
644 #define IOf_START 2 /* check for null ARGV and substitute '-' */
645 #define IOf_FLUSH 4 /* this fp wants a flush after write op */
646 #define IOf_DIDTOP 8 /* just did top of form */
647 #define IOf_UNTAINT 16 /* consider this fp (and its data) "safe" */
648 #define IOf_NOLINE 32 /* slurped a pseudo-line from empty file */
649 #define IOf_FAKE_DIRP 64 /* xio_dirp is fake (source filters kludge)
650 Also, when this is set, SvPVX() is valid */
652 /* The following macros define implementation-independent predicates on SVs. */
655 =for apidoc Am|U32|SvNIOK|SV* sv
656 Returns a U32 value indicating whether the SV contains a number, integer or
659 =for apidoc Am|U32|SvNIOKp|SV* sv
660 Returns a U32 value indicating whether the SV contains a number, integer or
661 double. Checks the B<private> setting. Use C<SvNIOK> instead.
663 =for apidoc Am|void|SvNIOK_off|SV* sv
664 Unsets the NV/IV status of an SV.
666 =for apidoc Am|U32|SvOK|SV* sv
667 Returns a U32 value indicating whether the value is defined. This is
668 only meaningful for scalars.
670 =for apidoc Am|U32|SvIOKp|SV* sv
671 Returns a U32 value indicating whether the SV contains an integer. Checks
672 the B<private> setting. Use C<SvIOK> instead.
674 =for apidoc Am|U32|SvNOKp|SV* sv
675 Returns a U32 value indicating whether the SV contains a double. Checks the
676 B<private> setting. Use C<SvNOK> instead.
678 =for apidoc Am|U32|SvPOKp|SV* sv
679 Returns a U32 value indicating whether the SV contains a character string.
680 Checks the B<private> setting. Use C<SvPOK> instead.
682 =for apidoc Am|U32|SvIOK|SV* sv
683 Returns a U32 value indicating whether the SV contains an integer.
685 =for apidoc Am|void|SvIOK_on|SV* sv
686 Tells an SV that it is an integer.
688 =for apidoc Am|void|SvIOK_off|SV* sv
689 Unsets the IV status of an SV.
691 =for apidoc Am|void|SvIOK_only|SV* sv
692 Tells an SV that it is an integer and disables all other C<OK> bits.
694 =for apidoc Am|void|SvIOK_only_UV|SV* sv
695 Tells an SV that it is an unsigned integer and disables all other C<OK> bits.
697 =for apidoc Am|bool|SvIOK_UV|SV* sv
698 Returns a boolean indicating whether the SV contains an integer that must be
699 interpreted as unsigned. A non-negative integer whose value is within the
700 range of both an IV and a UV may be be flagged as either C<SvUOK> or C<SVIOK>.
702 =for apidoc Am|bool|SvUOK|SV* sv
703 Returns a boolean indicating whether the SV contains an integer that must be
704 interpreted as unsigned. A non-negative integer whose value is within the
705 range of both an IV and a UV may be be flagged as either C<SvUOK> or C<SVIOK>.
707 =for apidoc Am|bool|SvIOK_notUV|SV* sv
708 Returns a boolean indicating whether the SV contains a signed integer.
710 =for apidoc Am|U32|SvNOK|SV* sv
711 Returns a U32 value indicating whether the SV contains a double.
713 =for apidoc Am|void|SvNOK_on|SV* sv
714 Tells an SV that it is a double.
716 =for apidoc Am|void|SvNOK_off|SV* sv
717 Unsets the NV status of an SV.
719 =for apidoc Am|void|SvNOK_only|SV* sv
720 Tells an SV that it is a double and disables all other OK bits.
722 =for apidoc Am|U32|SvPOK|SV* sv
723 Returns a U32 value indicating whether the SV contains a character
726 =for apidoc Am|void|SvPOK_on|SV* sv
727 Tells an SV that it is a string.
729 =for apidoc Am|void|SvPOK_off|SV* sv
730 Unsets the PV status of an SV.
732 =for apidoc Am|void|SvPOK_only|SV* sv
733 Tells an SV that it is a string and disables all other C<OK> bits.
734 Will also turn off the UTF-8 status.
736 =for apidoc Am|bool|SvVOK|SV* sv
737 Returns a boolean indicating whether the SV contains a v-string.
739 =for apidoc Am|U32|SvOOK|SV* sv
740 Returns a U32 indicating whether the pointer to the string buffer is offset.
741 This hack is used internally to speed up removal of characters from the
742 beginning of a C<SvPV>. When C<SvOOK> is true, then the start of the
743 allocated string buffer is actually C<SvOOK_offset()> bytes before C<SvPVX>.
744 This offset used to be stored in C<SvIVX>, but is now stored within the spare
747 =for apidoc Am|U32|SvROK|SV* sv
748 Tests if the SV is an RV.
750 =for apidoc Am|void|SvROK_on|SV* sv
751 Tells an SV that it is an RV.
753 =for apidoc Am|void|SvROK_off|SV* sv
754 Unsets the RV status of an SV.
756 =for apidoc Am|SV*|SvRV|SV* sv
757 Dereferences an RV to return the SV.
759 =for apidoc Am|IV|SvIVX|SV* sv
760 Returns the raw value in the SV's IV slot, without checks or conversions.
761 Only use when you are sure C<SvIOK> is true. See also C<L</SvIV>>.
763 =for apidoc Am|UV|SvUVX|SV* sv
764 Returns the raw value in the SV's UV slot, without checks or conversions.
765 Only use when you are sure C<SvIOK> is true. See also C<L</SvUV>>.
767 =for apidoc Am|NV|SvNVX|SV* sv
768 Returns the raw value in the SV's NV slot, without checks or conversions.
769 Only use when you are sure C<SvNOK> is true. See also C<L</SvNV>>.
771 =for apidoc Am|char*|SvPVX|SV* sv
772 Returns a pointer to the physical string in the SV. The SV must contain a
773 string. Prior to 5.9.3 it is not safe
774 to execute this macro unless the SV's
777 This is also used to store the name of an autoloaded subroutine in an XS
778 AUTOLOAD routine. See L<perlguts/Autoloading with XSUBs>.
780 =for apidoc Am|STRLEN|SvCUR|SV* sv
781 Returns the length of the string which is in the SV. See C<L</SvLEN>>.
783 =for apidoc Am|STRLEN|SvLEN|SV* sv
784 Returns the size of the string buffer in the SV, not including any part
785 attributable to C<SvOOK>. See C<L</SvCUR>>.
787 =for apidoc Am|char*|SvEND|SV* sv
788 Returns a pointer to the spot just after the last character in
789 the string which is in the SV, where there is usually a trailing
790 C<NUL> character (even though Perl scalars do not strictly require it).
791 See C<L</SvCUR>>. Access the character as C<*(SvEND(sv))>.
793 Warning: If C<SvCUR> is equal to C<SvLEN>, then C<SvEND> points to
796 =for apidoc Am|HV*|SvSTASH|SV* sv
797 Returns the stash of the SV.
799 =for apidoc Am|void|SvIV_set|SV* sv|IV val
800 Set the value of the IV pointer in sv to val. It is possible to perform
801 the same function of this macro with an lvalue assignment to C<SvIVX>.
802 With future Perls, however, it will be more efficient to use
803 C<SvIV_set> instead of the lvalue assignment to C<SvIVX>.
805 =for apidoc Am|void|SvNV_set|SV* sv|NV val
806 Set the value of the NV pointer in C<sv> to val. See C<L</SvIV_set>>.
808 =for apidoc Am|void|SvPV_set|SV* sv|char* val
809 This is probably not what you want to use, you probably wanted
810 L</sv_usepvn_flags> or L</sv_setpvn> or L</sv_setpvs>.
812 Set the value of the PV pointer in C<sv> to the Perl allocated
813 C<NUL>-terminated string C<val>. See also C<L</SvIV_set>>.
815 Remember to free the previous PV buffer. There are many things to check.
816 Beware that the existing pointer may be involved in copy-on-write or other
817 mischief, so do C<SvOOK_off(sv)> and use C<sv_force_normal> or
818 C<SvPV_force> (or check the C<SvIsCOW> flag) first to make sure this
819 modification is safe. Then finally, if it is not a COW, call C<SvPV_free> to
820 free the previous PV buffer.
822 =for apidoc Am|void|SvUV_set|SV* sv|UV val
823 Set the value of the UV pointer in C<sv> to val. See C<L</SvIV_set>>.
825 =for apidoc Am|void|SvRV_set|SV* sv|SV* val
826 Set the value of the RV pointer in C<sv> to val. See C<L</SvIV_set>>.
828 =for apidoc Am|void|SvMAGIC_set|SV* sv|MAGIC* val
829 Set the value of the MAGIC pointer in C<sv> to val. See C<L</SvIV_set>>.
831 =for apidoc Am|void|SvSTASH_set|SV* sv|HV* val
832 Set the value of the STASH pointer in C<sv> to val. See C<L</SvIV_set>>.
834 =for apidoc Am|void|SvCUR_set|SV* sv|STRLEN len
835 Set the current length of the string which is in the SV. See C<L</SvCUR>>
838 =for apidoc Am|void|SvLEN_set|SV* sv|STRLEN len
839 Set the size of the string buffer for the SV. See C<L</SvLEN>>.
844 #define SvNIOK(sv) (SvFLAGS(sv) & (SVf_IOK|SVf_NOK))
845 #define SvNIOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK))
846 #define SvNIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK| \
847 SVp_IOK|SVp_NOK|SVf_IVisUV))
849 #define assert_not_ROK(sv) assert_(!SvROK(sv) || !SvRV(sv))
850 #define assert_not_glob(sv) assert_(!isGV_with_GP(sv))
852 #define SvOK(sv) (SvFLAGS(sv) & SVf_OK || isREGEXP(sv))
853 #define SvOK_off(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
854 SvFLAGS(sv) &= ~(SVf_OK| \
855 SVf_IVisUV|SVf_UTF8), \
857 #define SvOK_off_exc_UV(sv) (assert_not_ROK(sv) \
858 SvFLAGS(sv) &= ~(SVf_OK| \
862 #define SvOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK))
863 #define SvIOKp(sv) (SvFLAGS(sv) & SVp_IOK)
864 #define SvIOKp_on(sv) (assert_not_glob(sv) \
865 SvFLAGS(sv) |= SVp_IOK)
866 #define SvNOKp(sv) (SvFLAGS(sv) & SVp_NOK)
867 #define SvNOKp_on(sv) (assert_not_glob(sv) SvFLAGS(sv) |= SVp_NOK)
868 #define SvPOKp(sv) (SvFLAGS(sv) & SVp_POK)
869 #define SvPOKp_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
870 SvFLAGS(sv) |= SVp_POK)
872 #define SvIOK(sv) (SvFLAGS(sv) & SVf_IOK)
873 #define SvIOK_on(sv) (assert_not_glob(sv) \
874 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
875 #define SvIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVp_IOK|SVf_IVisUV))
876 #define SvIOK_only(sv) (SvOK_off(sv), \
877 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
878 #define SvIOK_only_UV(sv) (assert_not_glob(sv) SvOK_off_exc_UV(sv), \
879 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
881 #define SvIOK_UV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
882 == (SVf_IOK|SVf_IVisUV))
883 #define SvUOK(sv) SvIOK_UV(sv)
884 #define SvIOK_notUV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
887 #define SvIsUV(sv) (SvFLAGS(sv) & SVf_IVisUV)
888 #define SvIsUV_on(sv) (SvFLAGS(sv) |= SVf_IVisUV)
889 #define SvIsUV_off(sv) (SvFLAGS(sv) &= ~SVf_IVisUV)
891 #define SvNOK(sv) (SvFLAGS(sv) & SVf_NOK)
892 #define SvNOK_on(sv) (assert_not_glob(sv) \
893 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
894 #define SvNOK_off(sv) (SvFLAGS(sv) &= ~(SVf_NOK|SVp_NOK))
895 #define SvNOK_only(sv) (SvOK_off(sv), \
896 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
899 =for apidoc Am|U32|SvUTF8|SV* sv
900 Returns a U32 value indicating the UTF-8 status of an SV. If things are set-up
901 properly, this indicates whether or not the SV contains UTF-8 encoded data.
902 You should use this I<after> a call to C<SvPV()> or one of its variants, in
903 case any call to string overloading updates the internal flag.
905 If you want to take into account the L<bytes> pragma, use C<L</DO_UTF8>>
908 =for apidoc Am|void|SvUTF8_on|SV *sv
909 Turn on the UTF-8 status of an SV (the data is not changed, just the flag).
910 Do not use frivolously.
912 =for apidoc Am|void|SvUTF8_off|SV *sv
913 Unsets the UTF-8 status of an SV (the data is not changed, just the flag).
914 Do not use frivolously.
916 =for apidoc Am|void|SvPOK_only_UTF8|SV* sv
917 Tells an SV that it is a string and disables all other C<OK> bits,
918 and leaves the UTF-8 status as it was.
923 /* Ensure the return value of this macro does not clash with the GV_ADD* flags
925 #define SvUTF8(sv) (SvFLAGS(sv) & SVf_UTF8)
926 #define SvUTF8_on(sv) (SvFLAGS(sv) |= (SVf_UTF8))
927 #define SvUTF8_off(sv) (SvFLAGS(sv) &= ~(SVf_UTF8))
929 #define SvPOK(sv) (SvFLAGS(sv) & SVf_POK)
930 #define SvPOK_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
931 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
932 #define SvPOK_off(sv) (SvFLAGS(sv) &= ~(SVf_POK|SVp_POK))
933 #define SvPOK_only(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
934 SvFLAGS(sv) &= ~(SVf_OK| \
935 SVf_IVisUV|SVf_UTF8), \
936 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
937 #define SvPOK_only_UTF8(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
938 SvFLAGS(sv) &= ~(SVf_OK| \
940 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
942 #define SvVOK(sv) (SvMAGICAL(sv) \
943 && mg_find(sv,PERL_MAGIC_vstring))
944 /* returns the vstring magic, if any */
945 #define SvVSTRING_mg(sv) (SvMAGICAL(sv) \
946 ? mg_find(sv,PERL_MAGIC_vstring) : NULL)
948 #define SvOOK(sv) (SvFLAGS(sv) & SVf_OOK)
949 #define SvOOK_on(sv) (SvFLAGS(sv) |= SVf_OOK)
950 #define SvOOK_off(sv) ((void)(SvOOK(sv) && (sv_backoff(sv),0)))
952 #define SvFAKE(sv) (SvFLAGS(sv) & SVf_FAKE)
953 #define SvFAKE_on(sv) (SvFLAGS(sv) |= SVf_FAKE)
954 #define SvFAKE_off(sv) (SvFLAGS(sv) &= ~SVf_FAKE)
956 #define SvROK(sv) (SvFLAGS(sv) & SVf_ROK)
957 #define SvROK_on(sv) (SvFLAGS(sv) |= SVf_ROK)
958 #define SvROK_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK))
960 #define SvMAGICAL(sv) (SvFLAGS(sv) & (SVs_GMG|SVs_SMG|SVs_RMG))
961 #define SvMAGICAL_on(sv) (SvFLAGS(sv) |= (SVs_GMG|SVs_SMG|SVs_RMG))
962 #define SvMAGICAL_off(sv) (SvFLAGS(sv) &= ~(SVs_GMG|SVs_SMG|SVs_RMG))
964 #define SvGMAGICAL(sv) (SvFLAGS(sv) & SVs_GMG)
965 #define SvGMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_GMG)
966 #define SvGMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_GMG)
968 #define SvSMAGICAL(sv) (SvFLAGS(sv) & SVs_SMG)
969 #define SvSMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_SMG)
970 #define SvSMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_SMG)
972 #define SvRMAGICAL(sv) (SvFLAGS(sv) & SVs_RMG)
973 #define SvRMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_RMG)
974 #define SvRMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_RMG)
976 #define SvAMAGIC(sv) (SvROK(sv) && SvOBJECT(SvRV(sv)) && \
977 HvAMAGIC(SvSTASH(SvRV(sv))))
979 /* To be used on the stashes themselves: */
980 #define HvAMAGIC(hv) (SvFLAGS(hv) & SVf_AMAGIC)
981 #define HvAMAGIC_on(hv) (SvFLAGS(hv) |= SVf_AMAGIC)
982 #define HvAMAGIC_off(hv) (SvFLAGS(hv) &=~ SVf_AMAGIC)
985 /* "nog" means "doesn't have get magic" */
986 #define SvPOK_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVs_GMG)) == SVf_POK)
987 #define SvIOK_nog(sv) ((SvFLAGS(sv) & (SVf_IOK|SVs_GMG)) == SVf_IOK)
988 #define SvUOK_nog(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV|SVs_GMG)) == (SVf_IOK|SVf_IVisUV))
989 #define SvNOK_nog(sv) ((SvFLAGS(sv) & (SVf_NOK|SVs_GMG)) == SVf_NOK)
990 #define SvNIOK_nog(sv) (SvNIOK(sv) && !(SvFLAGS(sv) & SVs_GMG))
992 #define SvPOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
993 #define SvIOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_THINKFIRST|SVs_GMG)) == SVf_IOK)
994 #define SvUOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV|SVf_THINKFIRST|SVs_GMG)) == (SVf_IOK|SVf_IVisUV))
995 #define SvNOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_NOK|SVf_THINKFIRST|SVs_GMG)) == SVf_NOK)
996 #define SvNIOK_nogthink(sv) (SvNIOK(sv) && !(SvFLAGS(sv) & (SVf_THINKFIRST|SVs_GMG)))
998 #define SvPOK_utf8_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVs_GMG)) == (SVf_POK|SVf_UTF8))
999 #define SvPOK_utf8_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST|SVs_GMG)) == (SVf_POK|SVf_UTF8))
1001 #define SvPOK_byte_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVs_GMG)) == SVf_POK)
1002 #define SvPOK_byte_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
1004 #define SvPOK_pure_nogthink(sv) \
1005 ((SvFLAGS(sv) & (SVf_POK|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
1006 #define SvPOK_utf8_pure_nogthink(sv) \
1007 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == (SVf_POK|SVf_UTF8))
1008 #define SvPOK_byte_pure_nogthink(sv) \
1009 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
1012 =for apidoc Am|U32|SvGAMAGIC|SV* sv
1014 Returns true if the SV has get magic or
1015 overloading. If either is true then
1016 the scalar is active data, and has the potential to return a new value every
1017 time it is accessed. Hence you must be careful to
1018 only read it once per user logical operation and work
1019 with that returned value. If neither is true then
1020 the scalar's value cannot change unless written to.
1025 #define SvGAMAGIC(sv) (SvGMAGICAL(sv) || SvAMAGIC(sv))
1027 #define Gv_AMG(stash) \
1028 (HvNAME(stash) && Gv_AMupdate(stash,FALSE) \
1030 : (HvAMAGIC_off(stash), 0))
1032 #define SvWEAKREF(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_WEAKREF)) \
1033 == (SVf_ROK|SVprv_WEAKREF))
1034 #define SvWEAKREF_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_WEAKREF))
1035 #define SvWEAKREF_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_WEAKREF))
1037 #define SvPCS_IMPORTED(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_PCS_IMPORTED)) \
1038 == (SVf_ROK|SVprv_PCS_IMPORTED))
1039 #define SvPCS_IMPORTED_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_PCS_IMPORTED))
1040 #define SvPCS_IMPORTED_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_PCS_IMPORTED))
1043 =for apidoc m|U32|SvTHINKFIRST|SV *sv
1045 A quick flag check to see whether an C<sv> should be passed to C<sv_force_normal>
1046 to be "downgraded" before C<SvIVX> or C<SvPVX> can be modified directly.
1048 For example, if your scalar is a reference and you want to modify the C<SvIVX>
1049 slot, you can't just do C<SvROK_off>, as that will leak the referent.
1051 This is used internally by various sv-modifying functions, such as
1052 C<sv_setsv>, C<sv_setiv> and C<sv_pvn_force>.
1054 One case that this does not handle is a gv without SvFAKE set. After
1056 if (SvTHINKFIRST(gv)) sv_force_normal(gv);
1058 it will still be a gv.
1060 C<SvTHINKFIRST> sometimes produces false positives. In those cases
1061 C<sv_force_normal> does nothing.
1066 #define SvTHINKFIRST(sv) (SvFLAGS(sv) & SVf_THINKFIRST)
1069 #define SvPADMY(sv) !(SvFLAGS(sv) & SVs_PADTMP)
1071 # define SvPADMY_on(sv) SvPADTMP_off(sv)
1074 #define SvPADTMP(sv) (SvFLAGS(sv) & (SVs_PADTMP))
1075 #define SvPADSTALE(sv) (SvFLAGS(sv) & (SVs_PADSTALE))
1077 #define SvPADTMP_on(sv) (SvFLAGS(sv) |= SVs_PADTMP)
1078 #define SvPADTMP_off(sv) (SvFLAGS(sv) &= ~SVs_PADTMP)
1079 #define SvPADSTALE_on(sv) S_SvPADSTALE_on(MUTABLE_SV(sv))
1080 #define SvPADSTALE_off(sv) S_SvPADSTALE_off(MUTABLE_SV(sv))
1082 #define SvTEMP(sv) (SvFLAGS(sv) & SVs_TEMP)
1083 #define SvTEMP_on(sv) (SvFLAGS(sv) |= SVs_TEMP)
1084 #define SvTEMP_off(sv) (SvFLAGS(sv) &= ~SVs_TEMP)
1086 #define SvOBJECT(sv) (SvFLAGS(sv) & SVs_OBJECT)
1087 #define SvOBJECT_on(sv) (SvFLAGS(sv) |= SVs_OBJECT)
1088 #define SvOBJECT_off(sv) (SvFLAGS(sv) &= ~SVs_OBJECT)
1091 =for apidoc Am|U32|SvREADONLY|SV* sv
1092 Returns true if the argument is readonly, otherwise returns false.
1093 Exposed to to perl code via Internals::SvREADONLY().
1095 =for apidoc Am|U32|SvREADONLY_on|SV* sv
1096 Mark an object as readonly. Exactly what this means depends on the object
1097 type. Exposed to perl code via Internals::SvREADONLY().
1099 =for apidoc Am|U32|SvREADONLY_off|SV* sv
1100 Mark an object as not-readonly. Exactly what this mean depends on the
1101 object type. Exposed to perl code via Internals::SvREADONLY().
1106 #define SvREADONLY(sv) (SvFLAGS(sv) & (SVf_READONLY|SVf_PROTECT))
1108 # define SvREADONLY_on(sv) (SvFLAGS(sv) |= (SVf_READONLY|SVf_PROTECT))
1109 # define SvREADONLY_off(sv) (SvFLAGS(sv) &=~(SVf_READONLY|SVf_PROTECT))
1111 # define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1112 # define SvREADONLY_off(sv) (SvFLAGS(sv) &= ~SVf_READONLY)
1115 #define SvSCREAM(sv) ((SvFLAGS(sv) & (SVp_SCREAM|SVp_POK)) == (SVp_SCREAM|SVp_POK))
1116 #define SvSCREAM_on(sv) (SvFLAGS(sv) |= SVp_SCREAM)
1117 #define SvSCREAM_off(sv) (SvFLAGS(sv) &= ~SVp_SCREAM)
1120 # define SvCOMPILED(sv) 0
1121 # define SvCOMPILED_on(sv)
1122 # define SvCOMPILED_off(sv)
1125 #define SvEVALED(sv) (SvFLAGS(sv) & SVrepl_EVAL)
1126 #define SvEVALED_on(sv) (SvFLAGS(sv) |= SVrepl_EVAL)
1127 #define SvEVALED_off(sv) (SvFLAGS(sv) &= ~SVrepl_EVAL)
1129 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1130 # define SvVALID(sv) ({ const SV *const _svvalid = (const SV*)(sv); \
1131 if (SvFLAGS(_svvalid) & SVpbm_VALID && !SvSCREAM(_svvalid)) \
1132 assert(!isGV_with_GP(_svvalid)); \
1133 (SvFLAGS(_svvalid) & SVpbm_VALID); \
1135 # define SvVALID_on(sv) ({ SV *const _svvalid = MUTABLE_SV(sv); \
1136 assert(!isGV_with_GP(_svvalid)); \
1137 assert(!SvSCREAM(_svvalid)); \
1138 (SvFLAGS(_svvalid) |= SVpbm_VALID); \
1140 # define SvVALID_off(sv) ({ SV *const _svvalid = MUTABLE_SV(sv); \
1141 assert(!isGV_with_GP(_svvalid)); \
1142 assert(!SvSCREAM(_svvalid)); \
1143 (SvFLAGS(_svvalid) &= ~SVpbm_VALID); \
1146 # define SvTAIL(sv) ({ const SV *const _svtail = (const SV *)(sv); \
1147 assert(SvTYPE(_svtail) != SVt_PVAV); \
1148 assert(SvTYPE(_svtail) != SVt_PVHV); \
1149 assert(!SvSCREAM(_svtail)); \
1150 (SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
1151 == (SVpbm_TAIL|SVpbm_VALID); \
1154 # define SvVALID(sv) ((SvFLAGS(sv) & SVpbm_VALID) && !SvSCREAM(sv))
1155 # define SvVALID_on(sv) (SvFLAGS(sv) |= SVpbm_VALID)
1156 # define SvVALID_off(sv) (SvFLAGS(sv) &= ~SVpbm_VALID)
1157 # define SvTAIL(sv) ((SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
1158 == (SVpbm_TAIL|SVpbm_VALID))
1161 #define SvTAIL_on(sv) (SvFLAGS(sv) |= SVpbm_TAIL)
1162 #define SvTAIL_off(sv) (SvFLAGS(sv) &= ~SVpbm_TAIL)
1164 #define SvRVx(sv) SvRV(sv)
1166 #ifdef PERL_DEBUG_COW
1167 /* Need -0.0 for SvNVX to preserve IEEE FP "negative zero" because
1168 +0.0 + -0.0 => +0.0 but -0.0 + -0.0 => -0.0 */
1169 # define SvIVX(sv) (0 + ((XPVIV*) SvANY(sv))->xiv_iv)
1170 # define SvUVX(sv) (0 + ((XPVUV*) SvANY(sv))->xuv_uv)
1171 # define SvNVX(sv) (-0.0 + ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv)
1172 # define SvRV(sv) (0 + (sv)->sv_u.svu_rv)
1173 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1174 /* Don't test the core XS code yet. */
1175 # if defined (PERL_CORE) && PERL_DEBUG_COW > 1
1176 # define SvPVX(sv) (0 + (assert_(!SvREADONLY(sv)) (sv)->sv_u.svu_pv))
1178 # define SvPVX(sv) SvPVX_mutable(sv)
1180 # define SvCUR(sv) (0 + ((XPV*) SvANY(sv))->xpv_cur)
1181 # define SvLEN(sv) (0 + ((XPV*) SvANY(sv))->xpv_len)
1182 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1184 # define SvMAGIC(sv) (0 + *(assert_(SvTYPE(sv) >= SVt_PVMG) &((XPVMG*) SvANY(sv))->xmg_u.xmg_magic))
1185 # define SvSTASH(sv) (0 + *(assert_(SvTYPE(sv) >= SVt_PVMG) &((XPVMG*) SvANY(sv))->xmg_stash))
1187 # define SvLEN(sv) ((XPV*) SvANY(sv))->xpv_len
1188 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1190 # if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1191 /* These get expanded inside other macros that already use a variable _sv */
1192 # define SvPVX(sv) \
1193 (*({ SV *const _svpvx = MUTABLE_SV(sv); \
1194 assert(PL_valid_types_PVX[SvTYPE(_svpvx) & SVt_MASK]); \
1195 assert(!isGV_with_GP(_svpvx)); \
1196 assert(!(SvTYPE(_svpvx) == SVt_PVIO \
1197 && !(IoFLAGS(_svpvx) & IOf_FAKE_DIRP))); \
1198 &((_svpvx)->sv_u.svu_pv); \
1200 # define SvCUR(sv) \
1201 (*({ const SV *const _svcur = (const SV *)(sv); \
1202 assert(PL_valid_types_PVX[SvTYPE(_svcur) & SVt_MASK] \
1203 || SvTYPE(_svcur) == SVt_REGEXP); \
1204 assert(!isGV_with_GP(_svcur)); \
1205 assert(!(SvTYPE(_svcur) == SVt_PVIO \
1206 && !(IoFLAGS(_svcur) & IOf_FAKE_DIRP))); \
1207 &(((XPV*) MUTABLE_PTR(SvANY(_svcur)))->xpv_cur); \
1209 # define SvIVX(sv) \
1210 (*({ const SV *const _svivx = (const SV *)(sv); \
1211 assert(PL_valid_types_IVX[SvTYPE(_svivx) & SVt_MASK]); \
1212 assert(!isGV_with_GP(_svivx)); \
1213 &(((XPVIV*) MUTABLE_PTR(SvANY(_svivx)))->xiv_iv); \
1215 # define SvUVX(sv) \
1216 (*({ const SV *const _svuvx = (const SV *)(sv); \
1217 assert(PL_valid_types_IVX[SvTYPE(_svuvx) & SVt_MASK]); \
1218 assert(!isGV_with_GP(_svuvx)); \
1219 &(((XPVUV*) MUTABLE_PTR(SvANY(_svuvx)))->xuv_uv); \
1221 # define SvNVX(sv) \
1222 (*({ const SV *const _svnvx = (const SV *)(sv); \
1223 assert(PL_valid_types_NVX[SvTYPE(_svnvx) & SVt_MASK]); \
1224 assert(!isGV_with_GP(_svnvx)); \
1225 &(((XPVNV*) MUTABLE_PTR(SvANY(_svnvx)))->xnv_u.xnv_nv); \
1228 (*({ SV *const _svrv = MUTABLE_SV(sv); \
1229 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1230 assert(!isGV_with_GP(_svrv)); \
1231 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1232 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1233 &((_svrv)->sv_u.svu_rv); \
1235 # define SvRV_const(sv) \
1236 ({ const SV *const _svrv = (const SV *)(sv); \
1237 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1238 assert(!isGV_with_GP(_svrv)); \
1239 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1240 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1241 (_svrv)->sv_u.svu_rv; \
1243 # define SvMAGIC(sv) \
1244 (*({ const SV *const _svmagic = (const SV *)(sv); \
1245 assert(SvTYPE(_svmagic) >= SVt_PVMG); \
1246 &(((XPVMG*) MUTABLE_PTR(SvANY(_svmagic)))->xmg_u.xmg_magic); \
1248 # define SvSTASH(sv) \
1249 (*({ const SV *const _svstash = (const SV *)(sv); \
1250 assert(SvTYPE(_svstash) >= SVt_PVMG); \
1251 &(((XPVMG*) MUTABLE_PTR(SvANY(_svstash)))->xmg_stash); \
1254 # define SvPVX(sv) ((sv)->sv_u.svu_pv)
1255 # define SvCUR(sv) ((XPV*) SvANY(sv))->xpv_cur
1256 # define SvIVX(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1257 # define SvUVX(sv) ((XPVUV*) SvANY(sv))->xuv_uv
1258 # define SvNVX(sv) ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv
1259 # define SvRV(sv) ((sv)->sv_u.svu_rv)
1260 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1261 # define SvMAGIC(sv) ((XPVMG*) SvANY(sv))->xmg_u.xmg_magic
1262 # define SvSTASH(sv) ((XPVMG*) SvANY(sv))->xmg_stash
1267 /* Given that these two are new, there can't be any existing code using them
1269 # define SvPVX_mutable(sv) (0 + (sv)->sv_u.svu_pv)
1270 # define SvPVX_const(sv) ((const char*)(0 + (sv)->sv_u.svu_pv))
1272 /* Except for the poison code, which uses & to scribble over the pointer after
1273 free() is called. */
1274 # define SvPVX_mutable(sv) ((sv)->sv_u.svu_pv)
1275 # define SvPVX_const(sv) ((const char*)((sv)->sv_u.svu_pv))
1278 #define SvIVXx(sv) SvIVX(sv)
1279 #define SvUVXx(sv) SvUVX(sv)
1280 #define SvNVXx(sv) SvNVX(sv)
1281 #define SvPVXx(sv) SvPVX(sv)
1282 #define SvLENx(sv) SvLEN(sv)
1283 #define SvENDx(sv) ((PL_Sv = (sv)), SvEND(PL_Sv))
1286 /* Ask a scalar nicely to try to become an IV, if possible.
1287 Not guaranteed to stay returning void */
1288 /* Macro won't actually call sv_2iv if already IOK */
1289 #define SvIV_please(sv) \
1290 STMT_START {if (!SvIOKp(sv) && (SvFLAGS(sv) & (SVf_NOK|SVf_POK))) \
1291 (void) SvIV(sv); } STMT_END
1292 #define SvIV_please_nomg(sv) \
1293 (!(SvFLAGS(sv) & (SVf_IOK|SVp_IOK)) && (SvFLAGS(sv) & (SVf_NOK|SVf_POK)) \
1294 ? (sv_2iv_flags(sv, 0), SvIOK(sv)) \
1296 #define SvIV_set(sv, val) \
1298 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1299 assert(!isGV_with_GP(sv)); \
1300 (((XPVIV*) SvANY(sv))->xiv_iv = (val)); } STMT_END
1301 #define SvNV_set(sv, val) \
1303 assert(PL_valid_types_NV_set[SvTYPE(sv) & SVt_MASK]); \
1304 assert(!isGV_with_GP(sv)); \
1305 (((XPVNV*)SvANY(sv))->xnv_u.xnv_nv = (val)); } STMT_END
1306 #define SvPV_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 ((sv)->sv_u.svu_pv = (val)); } STMT_END
1313 #define SvUV_set(sv, val) \
1315 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1316 assert(!isGV_with_GP(sv)); \
1317 (((XPVUV*)SvANY(sv))->xuv_uv = (val)); } STMT_END
1318 #define SvRV_set(sv, val) \
1320 assert(PL_valid_types_RV[SvTYPE(sv) & SVt_MASK]); \
1321 assert(!isGV_with_GP(sv)); \
1322 assert(!(SvTYPE(sv) == SVt_PVIO \
1323 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1324 ((sv)->sv_u.svu_rv = (val)); } STMT_END
1325 #define SvMAGIC_set(sv, val) \
1326 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1327 (((XPVMG*)SvANY(sv))->xmg_u.xmg_magic = (val)); } STMT_END
1328 #define SvSTASH_set(sv, val) \
1329 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1330 (((XPVMG*) SvANY(sv))->xmg_stash = (val)); } STMT_END
1331 #define SvCUR_set(sv, val) \
1333 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK] \
1334 || SvTYPE(sv) == SVt_REGEXP); \
1335 assert(!isGV_with_GP(sv)); \
1336 assert(!(SvTYPE(sv) == SVt_PVIO \
1337 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1338 (((XPV*) SvANY(sv))->xpv_cur = (val)); } STMT_END
1339 #define SvLEN_set(sv, val) \
1341 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1342 assert(!isGV_with_GP(sv)); \
1343 assert(!(SvTYPE(sv) == SVt_PVIO \
1344 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1345 (((XPV*) SvANY(sv))->xpv_len = (val)); } STMT_END
1346 #define SvEND_set(sv, val) \
1347 STMT_START { assert(SvTYPE(sv) >= SVt_PV); \
1348 SvCUR_set(sv, (val) - SvPVX(sv)); } STMT_END
1350 #define SvPV_renew(sv,n) \
1351 STMT_START { SvLEN_set(sv, n); \
1352 SvPV_set((sv), (MEM_WRAP_CHECK_(n,char) \
1353 (char*)saferealloc((Malloc_t)SvPVX(sv), \
1354 (MEM_SIZE)((n))))); \
1357 #define SvPV_shrink_to_cur(sv) STMT_START { \
1358 const STRLEN _lEnGtH = SvCUR(sv) + 1; \
1359 SvPV_renew(sv, _lEnGtH); \
1362 #define SvPV_free(sv) \
1364 assert(SvTYPE(sv) >= SVt_PV); \
1366 assert(!SvROK(sv)); \
1367 if(UNLIKELY(SvOOK(sv))) { \
1369 SvOOK_offset(sv, zok); \
1370 SvPV_set(sv, SvPVX_mutable(sv) - zok); \
1371 SvFLAGS(sv) &= ~SVf_OOK; \
1373 Safefree(SvPVX(sv)); \
1378 /* Code that crops up in three places to take a scalar and ready it to hold
1380 # define prepare_SV_for_RV(sv) \
1382 if (SvTYPE(sv) < SVt_PV && SvTYPE(sv) != SVt_IV) \
1383 sv_upgrade(sv, SVt_IV); \
1384 else if (SvTYPE(sv) >= SVt_PV) { \
1393 # define BmFLAGS(sv) (SvTAIL(sv) ? FBMcf_TAIL : 0)
1396 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1397 # define BmUSEFUL(sv) \
1398 (*({ SV *const _bmuseful = MUTABLE_SV(sv); \
1399 assert(SvTYPE(_bmuseful) >= SVt_PVIV); \
1400 assert(SvVALID(_bmuseful)); \
1401 assert(!SvIOK(_bmuseful)); \
1402 &(((XPVIV*) SvANY(_bmuseful))->xiv_u.xivu_iv); \
1405 # define BmUSEFUL(sv) ((XPVIV*) SvANY(sv))->xiv_u.xivu_iv
1410 # define BmRARE(sv) 0
1411 # define BmPREVIOUS(sv) 0
1414 #define FmLINES(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1416 #define LvTYPE(sv) ((XPVLV*) SvANY(sv))->xlv_type
1417 #define LvTARG(sv) ((XPVLV*) SvANY(sv))->xlv_targ
1418 #define LvTARGOFF(sv) ((XPVLV*) SvANY(sv))->xlv_targoff
1419 #define LvSTARGOFF(sv) ((XPVLV*) SvANY(sv))->xlv_targoff_u.xlvu_stargoff
1420 #define LvTARGLEN(sv) ((XPVLV*) SvANY(sv))->xlv_targlen
1421 #define LvFLAGS(sv) ((XPVLV*) SvANY(sv))->xlv_flags
1423 #define IoIFP(sv) (sv)->sv_u.svu_fp
1424 #define IoOFP(sv) ((XPVIO*) SvANY(sv))->xio_ofp
1425 #define IoDIRP(sv) ((XPVIO*) SvANY(sv))->xio_dirp
1426 #define IoANY(sv) ((XPVIO*) SvANY(sv))->xio_any
1427 #define IoLINES(sv) ((XPVIO*) SvANY(sv))->xiv_u.xivu_iv
1428 #define IoPAGE(sv) ((XPVIO*) SvANY(sv))->xio_page
1429 #define IoPAGE_LEN(sv) ((XPVIO*) SvANY(sv))->xio_page_len
1430 #define IoLINES_LEFT(sv)((XPVIO*) SvANY(sv))->xio_lines_left
1431 #define IoTOP_NAME(sv) ((XPVIO*) SvANY(sv))->xio_top_name
1432 #define IoTOP_GV(sv) ((XPVIO*) SvANY(sv))->xio_top_gv
1433 #define IoFMT_NAME(sv) ((XPVIO*) SvANY(sv))->xio_fmt_name
1434 #define IoFMT_GV(sv) ((XPVIO*) SvANY(sv))->xio_fmt_gv
1435 #define IoBOTTOM_NAME(sv)((XPVIO*) SvANY(sv))->xio_bottom_name
1436 #define IoBOTTOM_GV(sv) ((XPVIO*) SvANY(sv))->xio_bottom_gv
1437 #define IoTYPE(sv) ((XPVIO*) SvANY(sv))->xio_type
1438 #define IoFLAGS(sv) ((XPVIO*) SvANY(sv))->xio_flags
1440 /* IoTYPE(sv) is a single character telling the type of I/O connection. */
1441 #define IoTYPE_RDONLY '<'
1442 #define IoTYPE_WRONLY '>'
1443 #define IoTYPE_RDWR '+'
1444 #define IoTYPE_APPEND 'a'
1445 #define IoTYPE_PIPE '|'
1446 #define IoTYPE_STD '-' /* stdin or stdout */
1447 #define IoTYPE_SOCKET 's'
1448 #define IoTYPE_CLOSED ' '
1449 #define IoTYPE_IMPLICIT 'I' /* stdin or stdout or stderr */
1450 #define IoTYPE_NUMERIC '#' /* fdopen */
1453 =for apidoc Am|bool|SvTAINTED|SV* sv
1454 Checks to see if an SV is tainted. Returns TRUE if it is, FALSE if
1457 =for apidoc Am|void|SvTAINTED_on|SV* sv
1458 Marks an SV as tainted if tainting is enabled.
1460 =for apidoc Am|void|SvTAINTED_off|SV* sv
1461 Untaints an SV. Be I<very> careful with this routine, as it short-circuits
1462 some of Perl's fundamental security features. XS module authors should not
1463 use this function unless they fully understand all the implications of
1464 unconditionally untainting the value. Untainting should be done in the
1465 standard perl fashion, via a carefully crafted regexp, rather than directly
1466 untainting variables.
1468 =for apidoc Am|void|SvTAINT|SV* sv
1469 Taints an SV if tainting is enabled, and if some input to the current
1470 expression is tainted--usually a variable, but possibly also implicit
1471 inputs such as locale settings. C<SvTAINT> propagates that taintedness to
1472 the outputs of an expression in a pessimistic fashion; i.e., without paying
1473 attention to precisely which outputs are influenced by which inputs.
1478 #define sv_taint(sv) sv_magic((sv), NULL, PERL_MAGIC_taint, NULL, 0)
1480 #ifdef NO_TAINT_SUPPORT
1481 # define SvTAINTED(sv) 0
1483 # define SvTAINTED(sv) (SvMAGICAL(sv) && sv_tainted(sv))
1485 #define SvTAINTED_on(sv) STMT_START{ if(UNLIKELY(TAINTING_get)){sv_taint(sv);} }STMT_END
1486 #define SvTAINTED_off(sv) STMT_START{ if(UNLIKELY(TAINTING_get)){sv_untaint(sv);} }STMT_END
1488 #define SvTAINT(sv) \
1490 assert(TAINTING_get || !TAINT_get); \
1491 if (UNLIKELY(TAINT_get)) \
1496 =for apidoc Am|char*|SvPV_force|SV* sv|STRLEN len
1497 Like C<SvPV> but will force the SV into containing a string (C<SvPOK>), and
1498 only a string (C<SvPOK_only>), by hook or by crook. You need force if you are
1499 going to update the C<SvPVX> directly. Processes get magic.
1501 Note that coercing an arbitrary scalar into a plain PV will potentially
1502 strip useful data from it. For example if the SV was C<SvROK>, then the
1503 referent will have its reference count decremented, and the SV itself may
1504 be converted to an C<SvPOK> scalar with a string buffer containing a value
1505 such as C<"ARRAY(0x1234)">.
1507 =for apidoc Am|char*|SvPV_force_nomg|SV* sv|STRLEN len
1508 Like C<SvPV_force>, but doesn't process get magic.
1510 =for apidoc Am|char*|SvPV|SV* sv|STRLEN len
1511 Returns a pointer to the string in the SV, or a stringified form of
1512 the SV if the SV does not contain a string. The SV may cache the
1513 stringified version becoming C<SvPOK>. Handles 'get' magic. The
1514 C<len> variable will be set to the length of the string (this is a macro, so
1515 don't use C<&len>). See also C<L</SvPVx>> for a version which guarantees to
1516 evaluate C<sv> only once.
1518 Note that there is no guarantee that the return value of C<SvPV()> is
1519 equal to C<SvPVX(sv)>, or that C<SvPVX(sv)> contains valid data, or that
1520 successive calls to C<SvPV(sv)> will return the same pointer value each
1521 time. This is due to the way that things like overloading and
1522 Copy-On-Write are handled. In these cases, the return value may point to
1523 a temporary buffer or similar. If you absolutely need the C<SvPVX> field to
1524 be valid (for example, if you intend to write to it), then see
1527 =for apidoc Am|char*|SvPVx|SV* sv|STRLEN len
1528 A version of C<SvPV> which guarantees to evaluate C<sv> only once.
1529 Only use this if C<sv> is an expression with side effects, otherwise use the
1530 more efficient C<SvPV>.
1532 =for apidoc Am|char*|SvPV_nomg|SV* sv|STRLEN len
1533 Like C<SvPV> but doesn't process magic.
1535 =for apidoc Am|char*|SvPV_nolen|SV* sv
1536 Like C<SvPV> but doesn't set a length variable.
1538 =for apidoc Am|char*|SvPV_nomg_nolen|SV* sv
1539 Like C<SvPV_nolen> but doesn't process magic.
1541 =for apidoc Am|IV|SvIV|SV* sv
1542 Coerces the given SV to an integer and returns it. See C<L</SvIVx>> for a
1543 version which guarantees to evaluate C<sv> only once.
1545 =for apidoc Am|IV|SvIV_nomg|SV* sv
1546 Like C<SvIV> but doesn't process magic.
1548 =for apidoc Am|IV|SvIVx|SV* sv
1549 Coerces the given SV to an integer and returns it.
1550 Guarantees to evaluate C<sv> only once. Only use
1551 this if C<sv> is an expression with side effects,
1552 otherwise use the more efficient C<SvIV>.
1554 =for apidoc Am|NV|SvNV|SV* sv
1555 Coerce the given SV to a double and return it. See C<L</SvNVx>> for a version
1556 which guarantees to evaluate C<sv> only once.
1558 =for apidoc Am|NV|SvNV_nomg|SV* sv
1559 Like C<SvNV> but doesn't process magic.
1561 =for apidoc Am|NV|SvNVx|SV* sv
1562 Coerces the given SV to a double and returns it.
1563 Guarantees to evaluate C<sv> only once. Only use
1564 this if C<sv> is an expression with side effects,
1565 otherwise use the more efficient C<SvNV>.
1567 =for apidoc Am|UV|SvUV|SV* sv
1568 Coerces the given SV to an unsigned integer and returns it. See C<L</SvUVx>>
1569 for a version which guarantees to evaluate C<sv> only once.
1571 =for apidoc Am|UV|SvUV_nomg|SV* sv
1572 Like C<SvUV> but doesn't process magic.
1574 =for apidoc Am|UV|SvUVx|SV* sv
1575 Coerces the given SV to an unsigned integer and
1576 returns it. Guarantees to evaluate C<sv> only once. Only
1577 use this if C<sv> is an expression with side effects,
1578 otherwise use the more efficient C<SvUV>.
1580 =for apidoc Am|bool|SvTRUE|SV* sv
1581 Returns a boolean indicating whether Perl would evaluate the SV as true or
1582 false. See C<L</SvOK>> for a defined/undefined test. Handles 'get' magic
1583 unless the scalar is already C<SvPOK>, C<SvIOK> or C<SvNOK> (the public, not the
1586 =for apidoc Am|bool|SvTRUE_nomg|SV* sv
1587 Returns a boolean indicating whether Perl would evaluate the SV as true or
1588 false. See C<L</SvOK>> for a defined/undefined test. Does not handle 'get' magic.
1590 =for apidoc Am|char*|SvPVutf8_force|SV* sv|STRLEN len
1591 Like C<SvPV_force>, but converts C<sv> to UTF-8 first if necessary.
1593 =for apidoc Am|char*|SvPVutf8|SV* sv|STRLEN len
1594 Like C<SvPV>, but converts C<sv> to UTF-8 first if necessary.
1596 =for apidoc Am|char*|SvPVutf8_nolen|SV* sv
1597 Like C<SvPV_nolen>, but converts C<sv> to UTF-8 first if necessary.
1599 =for apidoc Am|char*|SvPVbyte_force|SV* sv|STRLEN len
1600 Like C<SvPV_force>, but converts C<sv> to byte representation first if necessary.
1602 =for apidoc Am|char*|SvPVbyte|SV* sv|STRLEN len
1603 Like C<SvPV>, but converts C<sv> to byte representation first if necessary.
1605 =for apidoc Am|char*|SvPVbyte_nolen|SV* sv
1606 Like C<SvPV_nolen>, but converts C<sv> to byte representation first if necessary.
1608 =for apidoc Am|char*|SvPVutf8x_force|SV* sv|STRLEN len
1609 Like C<SvPV_force>, but converts C<sv> to UTF-8 first if necessary.
1610 Guarantees to evaluate C<sv> only once; use the more efficient C<SvPVutf8_force>
1613 =for apidoc Am|char*|SvPVutf8x|SV* sv|STRLEN len
1614 Like C<SvPV>, but converts C<sv> to UTF-8 first if necessary.
1615 Guarantees to evaluate C<sv> only once; use the more efficient C<SvPVutf8>
1618 =for apidoc Am|char*|SvPVbytex_force|SV* sv|STRLEN len
1619 Like C<SvPV_force>, but converts C<sv> to byte representation first if necessary.
1620 Guarantees to evaluate C<sv> only once; use the more efficient C<SvPVbyte_force>
1623 =for apidoc Am|char*|SvPVbytex|SV* sv|STRLEN len
1624 Like C<SvPV>, but converts C<sv> to byte representation first if necessary.
1625 Guarantees to evaluate C<sv> only once; use the more efficient C<SvPVbyte>
1628 =for apidoc Am|U32|SvIsCOW|SV* sv
1629 Returns a U32 value indicating whether the SV is Copy-On-Write (either shared
1630 hash key scalars, or full Copy On Write scalars if 5.9.0 is configured for
1633 =for apidoc Am|bool|SvIsCOW_shared_hash|SV* sv
1634 Returns a boolean indicating whether the SV is Copy-On-Write shared hash key
1637 =for apidoc Am|void|sv_catpvn_nomg|SV* sv|const char* ptr|STRLEN len
1638 Like C<sv_catpvn> but doesn't process magic.
1640 =for apidoc Am|void|sv_catpv_nomg|SV* sv|const char* ptr
1641 Like C<sv_catpv> but doesn't process magic.
1643 =for apidoc Am|void|sv_setsv_nomg|SV* dsv|SV* ssv
1644 Like C<sv_setsv> but doesn't process magic.
1646 =for apidoc Am|void|sv_catsv_nomg|SV* dsv|SV* ssv
1647 Like C<sv_catsv> but doesn't process magic.
1649 =for apidoc Amdb|STRLEN|sv_utf8_upgrade_nomg|NN SV *sv
1651 Like C<sv_utf8_upgrade>, but doesn't do magic on C<sv>.
1656 /* Let us hope that bitmaps for UV and IV are the same */
1657 #define SvIV(sv) (SvIOK_nog(sv) ? SvIVX(sv) : sv_2iv(sv))
1658 #define SvUV(sv) (SvUOK_nog(sv) ? SvUVX(sv) : sv_2uv(sv))
1659 #define SvNV(sv) (SvNOK_nog(sv) ? SvNVX(sv) : sv_2nv(sv))
1661 #define SvIV_nomg(sv) (SvIOK(sv) ? SvIVX(sv) : sv_2iv_flags(sv, 0))
1662 #define SvUV_nomg(sv) (SvIOK(sv) ? SvUVX(sv) : sv_2uv_flags(sv, 0))
1663 #define SvNV_nomg(sv) (SvNOK(sv) ? SvNVX(sv) : sv_2nv_flags(sv, 0))
1667 #define SvPV(sv, lp) SvPV_flags(sv, lp, SV_GMAGIC)
1668 #define SvPV_const(sv, lp) SvPV_flags_const(sv, lp, SV_GMAGIC)
1669 #define SvPV_mutable(sv, lp) SvPV_flags_mutable(sv, lp, SV_GMAGIC)
1671 #define SvPV_flags(sv, lp, flags) \
1673 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pv_flags(sv, &lp, flags))
1674 #define SvPV_flags_const(sv, lp, flags) \
1676 ? ((lp = SvCUR(sv)), SvPVX_const(sv)) : \
1677 (const char*) sv_2pv_flags(sv, &lp, (flags|SV_CONST_RETURN)))
1678 #define SvPV_flags_const_nolen(sv, flags) \
1680 ? SvPVX_const(sv) : \
1681 (const char*) sv_2pv_flags(sv, 0, (flags|SV_CONST_RETURN)))
1682 #define SvPV_flags_mutable(sv, lp, flags) \
1684 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) : \
1685 sv_2pv_flags(sv, &lp, (flags|SV_MUTABLE_RETURN)))
1687 #define SvPV_force(sv, lp) SvPV_force_flags(sv, lp, SV_GMAGIC)
1688 #define SvPV_force_nolen(sv) SvPV_force_flags_nolen(sv, SV_GMAGIC)
1689 #define SvPV_force_mutable(sv, lp) SvPV_force_flags_mutable(sv, lp, SV_GMAGIC)
1691 #define SvPV_force_nomg(sv, lp) SvPV_force_flags(sv, lp, 0)
1692 #define SvPV_force_nomg_nolen(sv) SvPV_force_flags_nolen(sv, 0)
1694 #define SvPV_force_flags(sv, lp, flags) \
1695 (SvPOK_pure_nogthink(sv) \
1696 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvn_force_flags(sv, &lp, flags))
1698 #define SvPV_force_flags_nolen(sv, flags) \
1699 (SvPOK_pure_nogthink(sv) \
1700 ? SvPVX(sv) : sv_pvn_force_flags(sv, 0, flags))
1702 #define SvPV_force_flags_mutable(sv, lp, flags) \
1703 (SvPOK_pure_nogthink(sv) \
1704 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) \
1705 : sv_pvn_force_flags(sv, &lp, flags|SV_MUTABLE_RETURN))
1707 #define SvPV_nolen(sv) \
1709 ? SvPVX(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC))
1711 /* "_nomg" in these defines means no mg_get() */
1712 #define SvPV_nomg_nolen(sv) \
1714 ? SvPVX(sv) : sv_2pv_flags(sv, 0, 0))
1716 #define SvPV_nolen_const(sv) \
1718 ? SvPVX_const(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC|SV_CONST_RETURN))
1720 #define SvPV_nomg(sv, lp) SvPV_flags(sv, lp, 0)
1721 #define SvPV_nomg_const(sv, lp) SvPV_flags_const(sv, lp, 0)
1722 #define SvPV_nomg_const_nolen(sv) SvPV_flags_const_nolen(sv, 0)
1726 #define SvPVutf8(sv, lp) \
1727 (SvPOK_utf8_nog(sv) \
1728 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvutf8(sv, &lp))
1730 #define SvPVutf8_force(sv, lp) \
1731 (SvPOK_utf8_pure_nogthink(sv) \
1732 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvutf8n_force(sv, &lp))
1734 #define SvPVutf8_nolen(sv) \
1735 (SvPOK_utf8_nog(sv) \
1736 ? SvPVX(sv) : sv_2pvutf8(sv, 0))
1740 #define SvPVbyte(sv, lp) \
1741 (SvPOK_byte_nog(sv) \
1742 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvbyte(sv, &lp))
1744 #define SvPVbyte_force(sv, lp) \
1745 (SvPOK_byte_pure_nogthink(sv) \
1746 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvbyten_force(sv, &lp))
1748 #define SvPVbyte_nolen(sv) \
1749 (SvPOK_byte_nog(sv) \
1750 ? SvPVX(sv) : sv_2pvbyte(sv, 0))
1753 /* define FOOx(): idempotent versions of FOO(). If possible, use a local
1754 * var to evaluate the arg once; failing that, use a global if possible;
1755 * failing that, call a function to do the work
1758 #define SvPVx_force(sv, lp) sv_pvn_force(sv, &lp)
1759 #define SvPVutf8x_force(sv, lp) sv_pvutf8n_force(sv, &lp)
1760 #define SvPVbytex_force(sv, lp) sv_pvbyten_force(sv, &lp)
1762 #define SvTRUE(sv) (LIKELY(sv) && (UNLIKELY(SvGMAGICAL(sv)) ? sv_2bool(sv) : SvTRUE_common(sv, sv_2bool_nomg(sv))))
1763 #define SvTRUE_nomg(sv) (LIKELY(sv) && ( SvTRUE_common(sv, sv_2bool_nomg(sv))))
1764 #define SvTRUE_NN(sv) (UNLIKELY(SvGMAGICAL(sv)) ? sv_2bool(sv) : SvTRUE_common(sv, sv_2bool_nomg(sv)))
1765 #define SvTRUE_nomg_NN(sv) ( SvTRUE_common(sv, sv_2bool_nomg(sv)))
1766 #define SvTRUE_common(sv,fallback) ( \
1771 : (SvFLAGS(sv) & (SVf_IOK|SVf_NOK)) \
1772 ? ( (SvIOK(sv) && SvIVX(sv) != 0) \
1773 || (SvNOK(sv) && SvNVX(sv) != 0.0)) \
1776 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1778 # define SvIVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvIV(_sv); })
1779 # define SvUVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvUV(_sv); })
1780 # define SvNVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvNV(_sv); })
1781 # define SvPVx(sv, lp) ({SV *_sv = (sv); SvPV(_sv, lp); })
1782 # define SvPVx_const(sv, lp) ({SV *_sv = (sv); SvPV_const(_sv, lp); })
1783 # define SvPVx_nolen(sv) ({SV *_sv = (sv); SvPV_nolen(_sv); })
1784 # define SvPVx_nolen_const(sv) ({SV *_sv = (sv); SvPV_nolen_const(_sv); })
1785 # define SvPVutf8x(sv, lp) ({SV *_sv = (sv); SvPVutf8(_sv, lp); })
1786 # define SvPVbytex(sv, lp) ({SV *_sv = (sv); SvPVbyte(_sv, lp); })
1787 # define SvPVbytex_nolen(sv) ({SV *_sv = (sv); SvPVbyte_nolen(_sv); })
1788 # define SvTRUEx(sv) ({SV *_sv = (sv); SvTRUE(_sv); })
1789 # define SvTRUEx_nomg(sv) ({SV *_sv = (sv); SvTRUE_nomg(_sv); })
1791 #else /* __GNUC__ */
1793 /* These inlined macros use globals, which will require a thread
1794 * declaration in user code, so we avoid them under threads */
1796 # define SvIVx(sv) ((PL_Sv = (sv)), SvIV(PL_Sv))
1797 # define SvUVx(sv) ((PL_Sv = (sv)), SvUV(PL_Sv))
1798 # define SvNVx(sv) ((PL_Sv = (sv)), SvNV(PL_Sv))
1799 # define SvPVx(sv, lp) ((PL_Sv = (sv)), SvPV(PL_Sv, lp))
1800 # define SvPVx_const(sv, lp) ((PL_Sv = (sv)), SvPV_const(PL_Sv, lp))
1801 # define SvPVx_nolen(sv) ((PL_Sv = (sv)), SvPV_nolen(PL_Sv))
1802 # define SvPVx_nolen_const(sv) ((PL_Sv = (sv)), SvPV_nolen_const(PL_Sv))
1803 # define SvPVutf8x(sv, lp) ((PL_Sv = (sv)), SvPVutf8(PL_Sv, lp))
1804 # define SvPVbytex(sv, lp) ((PL_Sv = (sv)), SvPVbyte(PL_Sv, lp))
1805 # define SvPVbytex_nolen(sv) ((PL_Sv = (sv)), SvPVbyte_nolen(PL_Sv))
1806 # define SvTRUEx(sv) ((PL_Sv = (sv)), SvTRUE(PL_Sv))
1807 # define SvTRUEx_nomg(sv) ((PL_Sv = (sv)), SvTRUE_nomg(PL_Sv))
1808 #endif /* __GNU__ */
1810 #define SvPVXtrue(sv) ( \
1811 ((XPV*)SvANY((sv))) \
1813 ((XPV*)SvANY((sv)))->xpv_cur > 1 \
1815 ((XPV*)SvANY((sv)))->xpv_cur \
1816 && *(sv)->sv_u.svu_pv != '0' \
1821 #define SvIsCOW(sv) (SvFLAGS(sv) & SVf_IsCOW)
1822 #define SvIsCOW_on(sv) (SvFLAGS(sv) |= SVf_IsCOW)
1823 #define SvIsCOW_off(sv) (SvFLAGS(sv) &= ~SVf_IsCOW)
1824 #define SvIsCOW_shared_hash(sv) (SvIsCOW(sv) && SvLEN(sv) == 0)
1826 #define SvSHARED_HEK_FROM_PV(pvx) \
1827 ((struct hek*)(pvx - STRUCT_OFFSET(struct hek, hek_key)))
1828 #define SvSHARED_HASH(sv) (0 + SvSHARED_HEK_FROM_PV(SvPVX_const(sv))->hek_hash)
1830 /* flag values for sv_*_flags functions */
1831 #define SV_IMMEDIATE_UNREF 1
1833 #define SV_COW_DROP_PV 4
1834 #define SV_UTF8_NO_ENCODING 8
1835 #define SV_NOSTEAL 16
1836 #define SV_CONST_RETURN 32
1837 #define SV_MUTABLE_RETURN 64
1838 #define SV_SMAGIC 128
1839 #define SV_HAS_TRAILING_NUL 256
1840 #define SV_COW_SHARED_HASH_KEYS 512
1841 /* This one is only enabled for PERL_OLD_COPY_ON_WRITE */
1842 /* XXX This flag actually enabled for any COW. But it appears not to do
1843 anything. Can we just remove it? Or will it serve some future
1845 #define SV_COW_OTHER_PVS 1024
1846 /* Make sv_2pv_flags return NULL if something is undefined. */
1847 #define SV_UNDEF_RETURNS_NULL 2048
1848 /* Tell sv_utf8_upgrade() to not check to see if an upgrade is really needed.
1849 * This is used when the caller has already determined it is, and avoids
1851 #define SV_FORCE_UTF8_UPGRADE 4096
1852 /* if (after resolving magic etc), the SV is found to be overloaded,
1853 * don't call the overload magic, just return as-is */
1854 #define SV_SKIP_OVERLOAD 8192
1855 #define SV_CATBYTES 16384
1856 #define SV_CATUTF8 32768
1858 /* The core is safe for this COW optimisation. XS code on CPAN may not be.
1859 So only default to doing the COW setup if we're in the core.
1862 # ifndef SV_DO_COW_SVSETSV
1863 # define SV_DO_COW_SVSETSV SV_COW_SHARED_HASH_KEYS|SV_COW_OTHER_PVS
1867 #ifndef SV_DO_COW_SVSETSV
1868 # define SV_DO_COW_SVSETSV 0
1872 #define sv_unref(sv) sv_unref_flags(sv, 0)
1873 #define sv_force_normal(sv) sv_force_normal_flags(sv, 0)
1874 #define sv_usepvn(sv, p, l) sv_usepvn_flags(sv, p, l, 0)
1875 #define sv_usepvn_mg(sv, p, l) sv_usepvn_flags(sv, p, l, SV_SMAGIC)
1877 /* We are about to replace the SV's current value. So if it's copy on write
1878 we need to normalise it. Use the SV_COW_DROP_PV flag hint to say that
1879 the value is about to get thrown away, so drop the PV rather than go to
1880 the effort of making a read-write copy only for it to get immediately
1883 #define SV_CHECK_THINKFIRST_COW_DROP(sv) if (SvTHINKFIRST(sv)) \
1884 sv_force_normal_flags(sv, SV_COW_DROP_PV)
1886 #ifdef PERL_COPY_ON_WRITE
1887 # define SvCANCOW(sv) \
1889 ? SvLEN(sv) ? CowREFCNT(sv) != SV_COW_REFCNT_MAX : 1 \
1890 : (SvFLAGS(sv) & CAN_COW_MASK) == CAN_COW_FLAGS \
1891 && SvCUR(sv)+1 < SvLEN(sv))
1892 /* Note: To allow 256 COW "copies", a refcnt of 0 means 1. */
1893 # define CowREFCNT(sv) (*(U8 *)(SvPVX(sv)+SvLEN(sv)-1))
1894 # define SV_COW_REFCNT_MAX ((1 << sizeof(U8)*8) - 1)
1895 # define CAN_COW_MASK (SVf_POK|SVf_ROK|SVp_POK|SVf_FAKE| \
1896 SVf_OOK|SVf_BREAK|SVf_READONLY|SVf_PROTECT)
1899 #define CAN_COW_FLAGS (SVp_POK|SVf_POK)
1901 #define SV_CHECK_THINKFIRST(sv) if (SvTHINKFIRST(sv)) \
1902 sv_force_normal_flags(sv, 0)
1905 /* all these 'functions' are now just macros */
1907 #define sv_pv(sv) SvPV_nolen(sv)
1908 #define sv_pvutf8(sv) SvPVutf8_nolen(sv)
1909 #define sv_pvbyte(sv) SvPVbyte_nolen(sv)
1911 #define sv_pvn_force_nomg(sv, lp) sv_pvn_force_flags(sv, lp, 0)
1912 #define sv_utf8_upgrade_flags(sv, flags) sv_utf8_upgrade_flags_grow(sv, flags, 0)
1913 #define sv_utf8_upgrade_nomg(sv) sv_utf8_upgrade_flags(sv, 0)
1914 #define sv_catpvn_nomg(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, 0)
1915 #define sv_catpv_nomg(dsv, sstr) sv_catpv_flags(dsv, sstr, 0)
1916 #define sv_setsv(dsv, ssv) \
1917 sv_setsv_flags(dsv, ssv, SV_GMAGIC|SV_DO_COW_SVSETSV)
1918 #define sv_setsv_nomg(dsv, ssv) sv_setsv_flags(dsv, ssv, SV_DO_COW_SVSETSV)
1919 #define sv_catsv(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC)
1920 #define sv_catsv_nomg(dsv, ssv) sv_catsv_flags(dsv, ssv, 0)
1921 #define sv_catsv_mg(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC|SV_SMAGIC)
1922 #define sv_catpvn(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, SV_GMAGIC)
1923 #define sv_catpvn_mg(sv, sstr, slen) sv_catpvn_flags(sv, sstr, slen, SV_GMAGIC|SV_SMAGIC);
1924 #define sv_copypv(dsv, ssv) sv_copypv_flags(dsv, ssv, SV_GMAGIC)
1925 #define sv_copypv_nomg(dsv, ssv) sv_copypv_flags(dsv, ssv, 0)
1926 #define sv_2pv(sv, lp) sv_2pv_flags(sv, lp, SV_GMAGIC)
1927 #define sv_2pv_nolen(sv) sv_2pv(sv, 0)
1928 #define sv_2pvbyte_nolen(sv) sv_2pvbyte(sv, 0)
1929 #define sv_2pvutf8_nolen(sv) sv_2pvutf8(sv, 0)
1930 #define sv_2pv_nomg(sv, lp) sv_2pv_flags(sv, lp, 0)
1931 #define sv_pvn_force(sv, lp) sv_pvn_force_flags(sv, lp, SV_GMAGIC)
1932 #define sv_utf8_upgrade(sv) sv_utf8_upgrade_flags(sv, SV_GMAGIC)
1933 #define sv_2iv(sv) sv_2iv_flags(sv, SV_GMAGIC)
1934 #define sv_2uv(sv) sv_2uv_flags(sv, SV_GMAGIC)
1935 #define sv_2nv(sv) sv_2nv_flags(sv, SV_GMAGIC)
1936 #define sv_eq(sv1, sv2) sv_eq_flags(sv1, sv2, SV_GMAGIC)
1937 #define sv_cmp(sv1, sv2) sv_cmp_flags(sv1, sv2, SV_GMAGIC)
1938 #define sv_cmp_locale(sv1, sv2) sv_cmp_locale_flags(sv1, sv2, SV_GMAGIC)
1939 #define sv_collxfrm(sv, nxp) sv_cmp_flags(sv, nxp, SV_GMAGIC)
1940 #define sv_2bool(sv) sv_2bool_flags(sv, SV_GMAGIC)
1941 #define sv_2bool_nomg(sv) sv_2bool_flags(sv, 0)
1942 #define sv_insert(bigstr, offset, len, little, littlelen) \
1943 Perl_sv_insert_flags(aTHX_ (bigstr),(offset), (len), (little), \
1944 (littlelen), SV_GMAGIC)
1945 #define sv_mortalcopy(sv) \
1946 Perl_sv_mortalcopy_flags(aTHX_ sv, SV_GMAGIC|SV_DO_COW_SVSETSV)
1947 #define sv_cathek(sv,hek) \
1949 HEK * const bmxk = hek; \
1950 sv_catpvn_flags(sv, HEK_KEY(bmxk), HEK_LEN(bmxk), \
1951 HEK_UTF8(bmxk) ? SV_CATUTF8 : SV_CATBYTES); \
1954 /* Should be named SvCatPVN_utf8_upgrade? */
1955 #define sv_catpvn_nomg_utf8_upgrade(dsv, sstr, slen, nsv) \
1958 nsv = newSVpvn_flags(sstr, slen, SVs_TEMP); \
1960 sv_setpvn(nsv, sstr, slen); \
1962 sv_utf8_upgrade(nsv); \
1963 sv_catsv_nomg(dsv, nsv); \
1965 #define sv_catpvn_nomg_maybeutf8(dsv, sstr, slen, is_utf8) \
1966 sv_catpvn_flags(dsv, sstr, slen, (is_utf8)?SV_CATUTF8:SV_CATBYTES)
1968 #if defined(PERL_CORE) || defined(PERL_EXT)
1969 # define sv_or_pv_len_utf8(sv, pv, bytelen) \
1971 ? utf8_length((U8 *)(pv), (U8 *)(pv)+(bytelen)) \
1976 =for apidoc Am|SV*|newRV_inc|SV* sv
1978 Creates an RV wrapper for an SV. The reference count for the original SV is
1984 #define newRV_inc(sv) newRV(sv)
1986 /* the following macros update any magic values this C<sv> is associated with */
1989 =head1 Magical Functions
1991 =for apidoc Am|void|SvGETMAGIC|SV* sv
1992 Invokes C<mg_get> on an SV if it has 'get' magic. For example, this
1993 will call C<FETCH> on a tied variable. This macro evaluates its
1994 argument more than once.
1996 =for apidoc Am|void|SvSETMAGIC|SV* sv
1997 Invokes C<mg_set> on an SV if it has 'set' magic. This is necessary
1998 after modifying a scalar, in case it is a magical variable like C<$|>
1999 or a tied variable (it calls C<STORE>). This macro evaluates its
2000 argument more than once.
2002 =for apidoc Am|void|SvSetSV|SV* dsv|SV* ssv
2003 Calls C<sv_setsv> if C<dsv> is not the same as C<ssv>. May evaluate arguments
2004 more than once. Does not handle 'set' magic on the destination SV.
2006 =for apidoc Am|void|SvSetSV_nosteal|SV* dsv|SV* ssv
2007 Calls a non-destructive version of C<sv_setsv> if C<dsv> is not the same as
2008 C<ssv>. May evaluate arguments more than once.
2010 =for apidoc Am|void|SvSetMagicSV|SV* dsv|SV* ssv
2011 Like C<SvSetSV>, but does any set magic required afterwards.
2013 =for apidoc Am|void|SvSetMagicSV_nosteal|SV* dsv|SV* ssv
2014 Like C<SvSetSV_nosteal>, but does any set magic required afterwards.
2016 =for apidoc Am|void|SvSHARE|SV* sv
2017 Arranges for C<sv> to be shared between threads if a suitable module
2020 =for apidoc Am|void|SvLOCK|SV* sv
2021 Arranges for a mutual exclusion lock to be obtained on C<sv> if a suitable module
2024 =for apidoc Am|void|SvUNLOCK|SV* sv
2025 Releases a mutual exclusion lock on C<sv> if a suitable module
2028 =head1 SV Manipulation Functions
2030 =for apidoc Am|char *|SvGROW|SV* sv|STRLEN len
2031 Expands the character buffer in the SV so that it has room for the
2032 indicated number of bytes (remember to reserve space for an extra trailing
2033 C<NUL> character). Calls C<sv_grow> to perform the expansion if necessary.
2034 Returns a pointer to the character
2035 buffer. SV must be of type >= C<SVt_PV>. One
2036 alternative is to call C<sv_grow> if you are not sure of the type of SV.
2041 #define SvSHARE(sv) PL_sharehook(aTHX_ sv)
2042 #define SvLOCK(sv) PL_lockhook(aTHX_ sv)
2043 #define SvUNLOCK(sv) PL_unlockhook(aTHX_ sv)
2044 #define SvDESTROYABLE(sv) PL_destroyhook(aTHX_ sv)
2046 #define SvGETMAGIC(x) ((void)(UNLIKELY(SvGMAGICAL(x)) && mg_get(x)))
2047 #define SvSETMAGIC(x) STMT_START { if (UNLIKELY(SvSMAGICAL(x))) mg_set(x); } STMT_END
2049 #define SvSetSV_and(dst,src,finally) \
2051 if (LIKELY((dst) != (src))) { \
2052 sv_setsv(dst, src); \
2056 #define SvSetSV_nosteal_and(dst,src,finally) \
2058 if (LIKELY((dst) != (src))) { \
2059 sv_setsv_flags(dst, src, SV_GMAGIC | SV_NOSTEAL | SV_DO_COW_SVSETSV); \
2064 #define SvSetSV(dst,src) \
2065 SvSetSV_and(dst,src,/*nothing*/;)
2066 #define SvSetSV_nosteal(dst,src) \
2067 SvSetSV_nosteal_and(dst,src,/*nothing*/;)
2069 #define SvSetMagicSV(dst,src) \
2070 SvSetSV_and(dst,src,SvSETMAGIC(dst))
2071 #define SvSetMagicSV_nosteal(dst,src) \
2072 SvSetSV_nosteal_and(dst,src,SvSETMAGIC(dst))
2075 #if !defined(SKIP_DEBUGGING)
2076 #define SvPEEK(sv) sv_peek(sv)
2078 #define SvPEEK(sv) ""
2081 #define SvIMMORTAL(sv) (SvREADONLY(sv) && ((sv)==&PL_sv_undef || (sv)==&PL_sv_yes || (sv)==&PL_sv_no || (sv)==&PL_sv_placeholder))
2084 /* exercise the immortal resurrection code in sv_free2() */
2085 # define SvREFCNT_IMMORTAL 1000
2087 # define SvREFCNT_IMMORTAL ((~(U32)0)/2)
2091 =for apidoc Am|SV *|boolSV|bool b
2093 Returns a true SV if C<b> is a true value, or a false SV if C<b> is 0.
2095 See also C<L</PL_sv_yes>> and C<L</PL_sv_no>>.
2100 #define boolSV(b) ((b) ? &PL_sv_yes : &PL_sv_no)
2102 #define isGV(sv) (SvTYPE(sv) == SVt_PVGV)
2103 /* If I give every macro argument a different name, then there won't be bugs
2104 where nested macros get confused. Been there, done that. */
2105 #define isGV_with_GP(pwadak) \
2106 (((SvFLAGS(pwadak) & (SVp_POK|SVpgv_GP)) == SVpgv_GP) \
2107 && (SvTYPE(pwadak) == SVt_PVGV || SvTYPE(pwadak) == SVt_PVLV))
2108 #define isGV_with_GP_on(sv) STMT_START { \
2109 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
2110 assert (!SvPOKp(sv)); \
2111 assert (!SvIOKp(sv)); \
2112 (SvFLAGS(sv) |= SVpgv_GP); \
2114 #define isGV_with_GP_off(sv) STMT_START { \
2115 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
2116 assert (!SvPOKp(sv)); \
2117 assert (!SvIOKp(sv)); \
2118 (SvFLAGS(sv) &= ~SVpgv_GP); \
2120 #define isREGEXP(sv) \
2121 (SvTYPE(sv) == SVt_REGEXP \
2122 || (SvFLAGS(sv) & (SVTYPEMASK|SVp_POK|SVpgv_GP|SVf_FAKE)) \
2123 == (SVt_PVLV|SVf_FAKE))
2127 # define SvGROW(sv,len) \
2128 (SvIsCOW(sv) || SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
2130 # define SvGROW(sv,len) (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
2132 #define SvGROW_mutable(sv,len) \
2133 (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX_mutable(sv))
2134 #define Sv_Grow sv_grow
2136 #define CLONEf_COPY_STACKS 1
2137 #define CLONEf_KEEP_PTR_TABLE 2
2138 #define CLONEf_CLONE_HOST 4
2139 #define CLONEf_JOIN_IN 8
2141 struct clone_params {
2144 PerlInterpreter *proto_perl;
2145 PerlInterpreter *new_perl;
2150 =for apidoc Am|SV*|newSVpvn_utf8|NULLOK const char* s|STRLEN len|U32 utf8
2152 Creates a new SV and copies a string (which may contain C<NUL> (C<\0>)
2153 characters) into it. If C<utf8> is true, calls
2154 C<SvUTF8_on> on the new SV. Implemented as a wrapper around C<newSVpvn_flags>.
2159 #define newSVpvn_utf8(s, len, u) newSVpvn_flags((s), (len), (u) ? SVf_UTF8 : 0)
2162 =for apidoc Amx|SV*|newSVpadname|PADNAME *pn
2164 Creates a new SV containing the pad name.
2169 #define newSVpadname(pn) newSVpvn_utf8(PadnamePV(pn), PadnameLEN(pn), TRUE)
2172 =for apidoc Am|void|SvOOK_offset|NN SV*sv|STRLEN len
2174 Reads into C<len> the offset from C<SvPVX> back to the true start of the
2175 allocated buffer, which will be non-zero if C<sv_chop> has been used to
2176 efficiently remove characters from start of the buffer. Implemented as a
2177 macro, which takes the address of C<len>, which must be of type C<STRLEN>.
2178 Evaluates C<sv> more than once. Sets C<len> to 0 if C<SvOOK(sv)> is false.
2184 /* Does the bot know something I don't?
2185 10:28 <@Nicholas> metabatman
2186 10:28 <+meta> Nicholas: crash
2188 # define SvOOK_offset(sv, offset) STMT_START { \
2189 assert(sizeof(offset) == sizeof(STRLEN)); \
2191 const U8 *_crash = (U8*)SvPVX_const(sv); \
2192 (offset) = *--_crash; \
2194 _crash -= sizeof(STRLEN); \
2195 Copy(_crash, (U8 *)&(offset), sizeof(STRLEN), U8); \
2198 /* Validate the preceding buffer's sentinels to \
2199 verify that no-one is using it. */ \
2200 const U8 *const _bonk = (U8*)SvPVX_const(sv) - (offset);\
2201 while (_crash > _bonk) { \
2203 assert (*_crash == (U8)PTR2UV(_crash)); \
2211 /* This is the same code, but avoids using any temporary variables: */
2212 # define SvOOK_offset(sv, offset) STMT_START { \
2213 assert(sizeof(offset) == sizeof(STRLEN)); \
2215 (offset) = ((U8*)SvPVX_const(sv))[-1]; \
2217 Copy(SvPVX_const(sv) - 1 - sizeof(STRLEN), \
2218 (U8*)&(offset), sizeof(STRLEN), U8); \
2226 #define newIO() MUTABLE_IO(newSV_type(SVt_PVIO))
2228 #define SV_CONST(name) \
2229 PL_sv_consts[SV_CONST_##name] \
2230 ? PL_sv_consts[SV_CONST_##name] \
2231 : (PL_sv_consts[SV_CONST_##name] = newSVpv_share(#name, 0))
2233 #define SV_CONST_TIESCALAR 0
2234 #define SV_CONST_TIEARRAY 1
2235 #define SV_CONST_TIEHASH 2
2236 #define SV_CONST_TIEHANDLE 3
2238 #define SV_CONST_FETCH 4
2239 #define SV_CONST_FETCHSIZE 5
2240 #define SV_CONST_STORE 6
2241 #define SV_CONST_STORESIZE 7
2242 #define SV_CONST_EXISTS 8
2244 #define SV_CONST_PUSH 9
2245 #define SV_CONST_POP 10
2246 #define SV_CONST_SHIFT 11
2247 #define SV_CONST_UNSHIFT 12
2248 #define SV_CONST_SPLICE 13
2249 #define SV_CONST_EXTEND 14
2251 #define SV_CONST_FIRSTKEY 15
2252 #define SV_CONST_NEXTKEY 16
2253 #define SV_CONST_SCALAR 17
2255 #define SV_CONST_OPEN 18
2256 #define SV_CONST_WRITE 19
2257 #define SV_CONST_PRINT 20
2258 #define SV_CONST_PRINTF 21
2259 #define SV_CONST_READ 22
2260 #define SV_CONST_READLINE 23
2261 #define SV_CONST_GETC 24
2262 #define SV_CONST_SEEK 25
2263 #define SV_CONST_TELL 26
2264 #define SV_CONST_EOF 27
2265 #define SV_CONST_BINMODE 28
2266 #define SV_CONST_FILENO 29
2267 #define SV_CONST_CLOSE 30
2269 #define SV_CONST_DELETE 31
2270 #define SV_CONST_CLEAR 32
2271 #define SV_CONST_UNTIE 33
2272 #define SV_CONST_DESTROY 34
2274 #define SV_CONSTS_COUNT 35
2277 * Bodyless IVs and NVs!
2279 * Since 5.9.2, we can avoid allocating a body for SVt_IV-type SVs.
2280 * Since the larger IV-holding variants of SVs store their integer
2281 * values in their respective bodies, the family of SvIV() accessor
2282 * macros would naively have to branch on the SV type to find the
2283 * integer value either in the HEAD or BODY. In order to avoid this
2284 * expensive branch, a clever soul has deployed a great hack:
2285 * We set up the SvANY pointer such that instead of pointing to a
2286 * real body, it points into the memory before the location of the
2287 * head. We compute this pointer such that the location of
2288 * the integer member of the hypothetical body struct happens to
2289 * be the same as the location of the integer member of the bodyless
2290 * SV head. This now means that the SvIV() family of accessors can
2291 * always read from the (hypothetical or real) body via SvANY.
2293 * Since the 5.21 dev series, we employ the same trick for NVs
2294 * if the architecture can support it (NVSIZE <= IVSIZE).
2297 /* The following two macros compute the necessary offsets for the above
2298 * trick and store them in SvANY for SvIV() (and friends) to use. */
2301 # define SET_SVANY_FOR_BODYLESS_IV(sv) \
2302 SvANY(sv) = (XPVIV*)((char*)&(sv->sv_u.svu_iv) \
2303 - STRUCT_OFFSET(XPVIV, xiv_iv))
2305 # define SET_SVANY_FOR_BODYLESS_NV(sv) \
2306 SvANY(sv) = (XPVNV*)((char*)&(sv->sv_u.svu_nv) \
2307 - STRUCT_OFFSET(XPVNV, xnv_u.xnv_nv))
2311 * ex: set ts=8 sts=4 sw=4 et: