3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
12 #undef sv_flags /* Convex has this in <signal.h> for sigvec() */
18 =for apidoc AmU||svtype
19 An enum of flags for Perl types. These are found in the file B<sv.h>
20 in the C<svtype> enum. Test these flags with the C<SvTYPE> macro.
22 =for apidoc AmU||SVt_PV
23 Pointer type flag for scalars. See C<svtype>.
25 =for apidoc AmU||SVt_IV
26 Integer type flag for scalars. See C<svtype>.
28 =for apidoc AmU||SVt_NV
29 Double type flag for scalars. See C<svtype>.
31 =for apidoc AmU||SVt_PVMG
32 Type flag for blessed scalars. See C<svtype>.
34 =for apidoc AmU||SVt_PVAV
35 Type flag for arrays. See C<svtype>.
37 =for apidoc AmU||SVt_PVHV
38 Type flag for hashes. See C<svtype>.
40 =for apidoc AmU||SVt_PVCV
41 Type flag for code refs. See C<svtype>.
51 /* RV was here, before it was merged with IV. */
57 /* PVBM was here, before BIND replaced it. */
65 SVt_LAST /* keep last in enum. used to size arrays */
68 /* *** any alterations to the SV types above need to be reflected in
69 * SVt_MASK and the various PL_valid_types_* tables */
71 #define SVt_MASK 0xf /* smallest bitmask that covers all types */
74 /* Although Fast Boyer Moore tables are now being stored in PVGVs, for most
75 purposes eternal code wanting to consider PVBM probably needs to think of
77 # define SVt_PVBM SVt_PVMG
78 /* Anything wanting to create a reference from clean should ensure that it has
79 a scalar of type SVt_IV now: */
80 # define SVt_RV SVt_IV
83 /* There is collusion here with sv_clear - sv_clear exits early for SVt_NULL
84 so never reaches the clause at the end that uses sv_type_details->body_size
85 to determine whether to call safefree(). Hence body_size can be set
86 non-zero to record the size of HEs, without fear of bogus frees. */
87 #if defined(PERL_IN_HV_C) || defined(PERL_IN_XS_APITEST)
88 #define HE_SVSLOT SVt_NULL
91 #define PERL_ARENA_ROOTS_SIZE (SVt_LAST)
93 /* typedefs to eliminate some typing */
95 typedef struct hek HEK;
97 /* Using C's structural equivalence to help emulate C++ inheritance here... */
99 /* start with 2 sv-head building blocks */
100 #define _SV_HEAD(ptrtype) \
101 ptrtype sv_any; /* pointer to body */ \
102 U32 sv_refcnt; /* how many references to us */ \
103 U32 sv_flags /* what we are */
105 #define _SV_HEAD_UNION \
107 char* svu_pv; /* pointer to malloced string */ \
110 SV* svu_rv; /* pointer to another SV */ \
118 struct STRUCT_SV { /* struct sv { */
121 #ifdef DEBUG_LEAKING_SCALARS
122 PERL_BITFIELD32 sv_debug_optype:9; /* the type of OP that allocated us */
123 PERL_BITFIELD32 sv_debug_inpad:1; /* was allocated in a pad for an OP */
124 PERL_BITFIELD32 sv_debug_line:16; /* the line where we were allocated */
125 UV sv_debug_serial; /* serial number of sv allocation */
126 char * sv_debug_file; /* the file where we were allocated */
127 SV * sv_debug_parent; /* what we were cloned from (ithreads)*/
132 _SV_HEAD(XPVGV*); /* pointer to xpvgv body */
137 _SV_HEAD(XPVCV*); /* pointer to xpvcv body */
142 _SV_HEAD(XPVAV*); /* pointer to xpvav body */
147 _SV_HEAD(XPVHV*); /* pointer to xpvhv body */
152 _SV_HEAD(XPVIO*); /* pointer to xpvio body */
157 _SV_HEAD(struct regexp*); /* pointer to regexp body */
162 #undef _SV_HEAD_UNION /* ensure no pollution */
165 =head1 SV Manipulation Functions
167 =for apidoc Am|U32|SvREFCNT|SV* sv
168 Returns the value of the object's reference count.
170 =for apidoc Am|SV*|SvREFCNT_inc|SV* sv
171 Increments the reference count of the given SV.
173 All of the following SvREFCNT_inc* macros are optimized versions of
174 SvREFCNT_inc, and can be replaced with SvREFCNT_inc.
176 =for apidoc Am|SV*|SvREFCNT_inc_NN|SV* sv
177 Same as SvREFCNT_inc, but can only be used if you know I<sv>
178 is not NULL. Since we don't have to check the NULLness, it's faster
181 =for apidoc Am|void|SvREFCNT_inc_void|SV* sv
182 Same as SvREFCNT_inc, but can only be used if you don't need the
183 return value. The macro doesn't need to return a meaningful value.
185 =for apidoc Am|void|SvREFCNT_inc_void_NN|SV* sv
186 Same as SvREFCNT_inc, but can only be used if you don't need the return
187 value, and you know that I<sv> is not NULL. The macro doesn't need
188 to return a meaningful value, or check for NULLness, so it's smaller
191 =for apidoc Am|SV*|SvREFCNT_inc_simple|SV* sv
192 Same as SvREFCNT_inc, but can only be used with expressions without side
193 effects. Since we don't have to store a temporary value, it's faster.
195 =for apidoc Am|SV*|SvREFCNT_inc_simple_NN|SV* sv
196 Same as SvREFCNT_inc_simple, but can only be used if you know I<sv>
197 is not NULL. Since we don't have to check the NULLness, it's faster
200 =for apidoc Am|void|SvREFCNT_inc_simple_void|SV* sv
201 Same as SvREFCNT_inc_simple, but can only be used if you don't need the
202 return value. The macro doesn't need to return a meaningful value.
204 =for apidoc Am|void|SvREFCNT_inc_simple_void_NN|SV* sv
205 Same as SvREFCNT_inc, but can only be used if you don't need the return
206 value, and you know that I<sv> is not NULL. The macro doesn't need
207 to return a meaningful value, or check for NULLness, so it's smaller
210 =for apidoc Am|void|SvREFCNT_dec|SV* sv
211 Decrements the reference count of the given SV.
213 =for apidoc Am|svtype|SvTYPE|SV* sv
214 Returns the type of the SV. See C<svtype>.
216 =for apidoc Am|void|SvUPGRADE|SV* sv|svtype type
217 Used to upgrade an SV to a more complex form. Uses C<sv_upgrade> to
218 perform the upgrade if necessary. See C<svtype>.
223 #define SvANY(sv) (sv)->sv_any
224 #define SvFLAGS(sv) (sv)->sv_flags
225 #define SvREFCNT(sv) (sv)->sv_refcnt
227 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
228 # define SvREFCNT_inc(sv) \
230 SV * const _sv = MUTABLE_SV(sv); \
235 # define SvREFCNT_inc_simple(sv) \
241 # define SvREFCNT_inc_NN(sv) \
243 SV * const _sv = MUTABLE_SV(sv); \
247 # define SvREFCNT_inc_void(sv) \
249 SV * const _sv = MUTABLE_SV(sv); \
251 (void)(SvREFCNT(_sv)++); \
254 # define SvREFCNT_inc(sv) \
255 ((PL_Sv=MUTABLE_SV(sv)) ? (++(SvREFCNT(PL_Sv)),PL_Sv) : NULL)
256 # define SvREFCNT_inc_simple(sv) \
257 ((sv) ? (SvREFCNT(sv)++,MUTABLE_SV(sv)) : NULL)
258 # define SvREFCNT_inc_NN(sv) \
259 (PL_Sv=MUTABLE_SV(sv),++(SvREFCNT(PL_Sv)),PL_Sv)
260 # define SvREFCNT_inc_void(sv) \
261 (void)((PL_Sv=MUTABLE_SV(sv)) ? ++(SvREFCNT(PL_Sv)) : 0)
264 /* These guys don't need the curly blocks */
265 #define SvREFCNT_inc_simple_void(sv) STMT_START { if (sv) SvREFCNT(sv)++; } STMT_END
266 #define SvREFCNT_inc_simple_NN(sv) (++(SvREFCNT(sv)),MUTABLE_SV(sv))
267 #define SvREFCNT_inc_void_NN(sv) (void)(++SvREFCNT(MUTABLE_SV(sv)))
268 #define SvREFCNT_inc_simple_void_NN(sv) (void)(++SvREFCNT(MUTABLE_SV(sv)))
270 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
271 # define SvREFCNT_dec(sv) \
273 SV * const _sv = MUTABLE_SV(sv); \
275 if (SvREFCNT(_sv)) { \
276 if (--(SvREFCNT(_sv)) == 0) \
277 Perl_sv_free2(aTHX_ _sv); \
284 #define SvREFCNT_dec(sv) sv_free(MUTABLE_SV(sv))
287 #define SVTYPEMASK 0xff
288 #define SvTYPE(sv) ((svtype)((sv)->sv_flags & SVTYPEMASK))
290 /* Sadly there are some parts of the core that have pointers to already-freed
291 SV heads, and rely on being able to tell that they are now free. So mark
292 them all by using a consistent macro. */
293 #define SvIS_FREED(sv) ((sv)->sv_flags == SVTYPEMASK)
295 #define SvUPGRADE(sv, mt) (SvTYPE(sv) >= (mt) || (sv_upgrade(sv, mt), 1))
297 #define SVf_IOK 0x00000100 /* has valid public integer value */
298 #define SVf_NOK 0x00000200 /* has valid public numeric value */
299 #define SVf_POK 0x00000400 /* has valid public pointer value */
300 #define SVf_ROK 0x00000800 /* has a valid reference pointer */
302 #define SVp_IOK 0x00001000 /* has valid non-public integer value */
303 #define SVp_NOK 0x00002000 /* has valid non-public numeric value */
304 #define SVp_POK 0x00004000 /* has valid non-public pointer value */
305 #define SVp_SCREAM 0x00008000 /* has been studied? */
306 #define SVphv_CLONEABLE SVp_SCREAM /* PVHV (stashes) clone its objects */
307 #define SVpgv_GP SVp_SCREAM /* GV has a valid GP */
308 #define SVprv_PCS_IMPORTED SVp_SCREAM /* RV is a proxy for a constant
309 subroutine in another package. Set the
310 CvIMPORTED_CV_ON() if it needs to be
311 expanded to a real GV */
312 /* 0x00010000 *** FREE SLOT */
313 #define SVs_PADTMP 0x00020000 /* in use as tmp; only if ! SVs_PADMY */
314 #define SVs_PADSTALE 0x00020000 /* lexical has gone out of scope;
315 only valid for SVs_PADMY */
316 #define SVpad_TYPED 0x00020000 /* pad name is a Typed Lexical */
317 #define SVs_PADMY 0x00040000 /* in use a "my" variable */
318 #define SVpad_OUR 0x00040000 /* pad name is "our" instead of "my" */
319 #define SVs_TEMP 0x00080000 /* string is stealable? */
320 #define SVs_OBJECT 0x00100000 /* is "blessed" */
321 #define SVs_GMG 0x00200000 /* has magical get method */
322 #define SVs_SMG 0x00400000 /* has magical set method */
323 #define SVs_RMG 0x00800000 /* has random magical methods */
325 #define SVf_FAKE 0x01000000 /* 0: glob or lexical is just a copy
326 1: SV head arena wasn't malloc()ed
327 2: in conjunction with SVf_READONLY
328 marks a shared hash key scalar
329 (SvLEN == 0) or a copy on write
330 string (SvLEN != 0) [SvIsCOW(sv)]
331 3: For PVCV, whether CvUNIQUE(cv)
332 refers to an eval or once only
333 [CvEVAL(cv), CvSPECIAL(cv)]
334 4: On a pad name SV, that slot in the
335 frame AV is a REFCNT'ed reference
336 to a lexical from "outside". */
337 #define SVphv_REHASH SVf_FAKE /* 5: On a PVHV, hash values are being
339 #define SVf_OOK 0x02000000 /* has valid offset value. For a PVHV this
340 means that a hv_aux struct is present
341 after the main array */
342 #define SVf_BREAK 0x04000000 /* refcnt is artificially low - used by
343 SVs in final arena cleanup.
344 Set in S_regtry on PL_reg_curpm, so that
345 perl_destruct will skip it. */
346 #define SVf_READONLY 0x08000000 /* may not be modified */
351 #define SVf_THINKFIRST (SVf_READONLY|SVf_ROK|SVf_FAKE)
353 #define SVf_OK (SVf_IOK|SVf_NOK|SVf_POK|SVf_ROK| \
354 SVp_IOK|SVp_NOK|SVp_POK|SVpgv_GP)
356 #define PRIVSHIFT 4 /* (SVp_?OK >> PRIVSHIFT) == SVf_?OK */
358 #define SVf_AMAGIC 0x10000000 /* has magical overloaded methods */
360 /* Ensure this value does not clash with the GV_ADD* flags in gv.h: */
361 #define SVf_UTF8 0x20000000 /* SvPV is UTF-8 encoded
362 This is also set on RVs whose overloaded
363 stringification is UTF-8. This might
364 only happen as a side effect of SvPV() */
367 /* Some private flags. */
369 /* PVAV could probably use 0x2000000 without conflict. I assume that PVFM can
370 be UTF-8 encoded, and PVCVs could well have UTF-8 prototypes. PVIOs haven't
371 been restructured, so sometimes get used as string buffers. */
374 #define SVphv_SHAREKEYS 0x20000000 /* PVHV keys live on shared string table */
376 /* PVNV, PVMG only, and only used in pads. Should be safe to test on any scalar
377 SV, as the core is careful to avoid setting both.
379 SVf_POK, SVp_POK also set:
381 0x0000C400 Studied (SvSCREAM)
382 0x40004400 FBM compiled (SvVALID)
385 0x00008000 GV with GP
386 0x00008800 RV with PCS imported
388 #define SVpad_NAME (SVp_SCREAM|SVpbm_VALID)
389 /* This SV is a name in the PAD, so
390 SVpad_TYPED, SVpad_OUR and SVpad_STATE
393 #define SVpav_REAL 0x40000000 /* free old entries */
395 #define SVphv_LAZYDEL 0x40000000 /* entry in xhv_eiter must be deleted */
396 /* This is only set true on a PVGV when it's playing "PVBM", but is tested for
397 on any regular scalar (anything <= PVLV) */
398 #define SVpbm_VALID 0x40000000
399 /* Only used in toke.c on an SV stored in PL_lex_repl */
400 #define SVrepl_EVAL 0x40000000 /* Replacement part of s///e */
402 /* IV, PVIV, PVNV, PVMG, PVGV and (I assume) PVLV */
403 #define SVf_IVisUV 0x80000000 /* use XPVUV instead of XPVIV */
405 #define SVpav_REIFY 0x80000000 /* can become real */
407 #define SVphv_HASKFLAGS 0x80000000 /* keys have flag byte after hash */
408 /* PVGV when SVpbm_VALID is true */
409 #define SVpbm_TAIL 0x80000000
410 /* RV upwards. However, SVf_ROK and SVp_IOK are exclusive */
411 #define SVprv_WEAKREF 0x80000000 /* Weak reference */
412 /* pad name vars only */
413 #define SVpad_STATE 0x80000000 /* pad name is a "state" var */
416 HV* xmg_stash; /* class package */ \
418 STRLEN xpv_cur; /* length of svu_pv as a C string */ \
419 STRLEN xpv_len /* allocated size */
422 NV xnv_nv; /* numeric value, if any */
427 } xpad_cop_seq; /* used by pad.c for cop_sequence */
430 U8 xbm_rare; /* rarest character in string */
431 } xbm_s; /* fields from PVBM */
435 IV xivu_iv; /* integer value */
437 HEK * xivu_namehek; /* xpvlv, xpvgv: GvNAME */
441 MAGIC* xmg_magic; /* linked list of magicalness */
442 HV* xmg_ourstash; /* Stash for our (when SvPAD_OUR is true) */
454 #define xiv_iv xiv_u.xivu_iv
461 #define xuv_uv xuv_u.xivu_uv
469 /* This structure must match the beginning of struct xpvhv in hv.h. */
483 char xlv_type; /* k=keys .=pos x=substr v=vec /=join/re
484 * y=alem/helem/iter t=tie T=tied HE */
487 /* This structure works in 3 ways - regular scalar, GV with GP, or fast
495 /* This structure must match XPVCV in cv.h */
497 typedef U16 cv_flags_t;
499 #define _XPVCV_COMMON \
507 void (*xcv_xsub) (pTHX_ CV*); \
513 U32 xcv_outside_seq; /* the COP sequence (at the point of our \
514 * compilation) in the lexically enclosing \
528 /* ifp and ofp are normally the same, but sockets need separate streams */
530 /* Cray addresses everything by word boundaries (64 bits) and
531 * code and data pointers cannot be mixed (which is exactly what
532 * Perl_filter_add() tries to do with the dirp), hence the
533 * following union trick (as suggested by Gurusamy Sarathy).
534 * For further information see Geir Johansen's problem report
535 * titled [ID 20000612.002] Perl problem on Cray system
536 * The any pointer (known as IoANY()) will also be a good place
537 * to hang any IO disciplines to.
540 DIR * xiou_dirp; /* for opendir, readdir, etc */
541 void * xiou_any; /* for alignment */
543 /* IV xio_lines is now in IVX $. */
544 IV xio_page; /* $% */
545 IV xio_page_len; /* $= */
546 IV xio_lines_left; /* $- */
547 char * xio_top_name; /* $^ */
548 GV * xio_top_gv; /* $^ */
549 char * xio_fmt_name; /* $~ */
550 GV * xio_fmt_gv; /* $~ */
551 char * xio_bottom_name;/* $^B */
552 GV * xio_bottom_gv; /* $^B */
557 #define xio_dirp xio_dirpu.xiou_dirp
558 #define xio_any xio_dirpu.xiou_any
560 #define IOf_ARGV 1 /* this fp iterates over ARGV */
561 #define IOf_START 2 /* check for null ARGV and substitute '-' */
562 #define IOf_FLUSH 4 /* this fp wants a flush after write op */
563 #define IOf_DIDTOP 8 /* just did top of form */
564 #define IOf_UNTAINT 16 /* consider this fp (and its data) "safe" */
565 #define IOf_NOLINE 32 /* slurped a pseudo-line from empty file */
566 #define IOf_FAKE_DIRP 64 /* xio_dirp is fake (source filters kludge)
567 Also, when this is set, SvPVX() is valid */
569 /* The following macros define implementation-independent predicates on SVs. */
572 =for apidoc Am|U32|SvNIOK|SV* sv
573 Returns a U32 value indicating whether the SV contains a number, integer or
576 =for apidoc Am|U32|SvNIOKp|SV* sv
577 Returns a U32 value indicating whether the SV contains a number, integer or
578 double. Checks the B<private> setting. Use C<SvNIOK> instead.
580 =for apidoc Am|void|SvNIOK_off|SV* sv
581 Unsets the NV/IV status of an SV.
583 =for apidoc Am|U32|SvOK|SV* sv
584 Returns a U32 value indicating whether the value is defined. This is
585 only meaningful for scalars.
587 =for apidoc Am|U32|SvIOKp|SV* sv
588 Returns a U32 value indicating whether the SV contains an integer. Checks
589 the B<private> setting. Use C<SvIOK> instead.
591 =for apidoc Am|U32|SvNOKp|SV* sv
592 Returns a U32 value indicating whether the SV contains a double. Checks the
593 B<private> setting. Use C<SvNOK> instead.
595 =for apidoc Am|U32|SvPOKp|SV* sv
596 Returns a U32 value indicating whether the SV contains a character string.
597 Checks the B<private> setting. Use C<SvPOK> instead.
599 =for apidoc Am|U32|SvIOK|SV* sv
600 Returns a U32 value indicating whether the SV contains an integer.
602 =for apidoc Am|void|SvIOK_on|SV* sv
603 Tells an SV that it is an integer.
605 =for apidoc Am|void|SvIOK_off|SV* sv
606 Unsets the IV status of an SV.
608 =for apidoc Am|void|SvIOK_only|SV* sv
609 Tells an SV that it is an integer and disables all other OK bits.
611 =for apidoc Am|void|SvIOK_only_UV|SV* sv
612 Tells and SV that it is an unsigned integer and disables all other OK bits.
614 =for apidoc Am|bool|SvIOK_UV|SV* sv
615 Returns a boolean indicating whether the SV contains an unsigned integer.
617 =for apidoc Am|bool|SvUOK|SV* sv
618 Returns a boolean indicating whether the SV contains an unsigned integer.
620 =for apidoc Am|bool|SvIOK_notUV|SV* sv
621 Returns a boolean indicating whether the SV contains a signed integer.
623 =for apidoc Am|U32|SvNOK|SV* sv
624 Returns a U32 value indicating whether the SV contains a double.
626 =for apidoc Am|void|SvNOK_on|SV* sv
627 Tells an SV that it is a double.
629 =for apidoc Am|void|SvNOK_off|SV* sv
630 Unsets the NV status of an SV.
632 =for apidoc Am|void|SvNOK_only|SV* sv
633 Tells an SV that it is a double and disables all other OK bits.
635 =for apidoc Am|U32|SvPOK|SV* sv
636 Returns a U32 value indicating whether the SV contains a character
639 =for apidoc Am|void|SvPOK_on|SV* sv
640 Tells an SV that it is a string.
642 =for apidoc Am|void|SvPOK_off|SV* sv
643 Unsets the PV status of an SV.
645 =for apidoc Am|void|SvPOK_only|SV* sv
646 Tells an SV that it is a string and disables all other OK bits.
647 Will also turn off the UTF-8 status.
649 =for apidoc Am|bool|SvVOK|SV* sv
650 Returns a boolean indicating whether the SV contains a v-string.
652 =for apidoc Am|U32|SvOOK|SV* sv
653 Returns a U32 indicating whether the pointer to the string buffer is offset.
654 This hack is used internally to speed up removal of characters from the
655 beginning of a SvPV. When SvOOK is true, then the start of the
656 allocated string buffer is actually C<SvOOK_offset()> bytes before SvPVX.
657 This offset used to be stored in SvIVX, but is now stored within the spare
660 =for apidoc Am|U32|SvROK|SV* sv
661 Tests if the SV is an RV.
663 =for apidoc Am|void|SvROK_on|SV* sv
664 Tells an SV that it is an RV.
666 =for apidoc Am|void|SvROK_off|SV* sv
667 Unsets the RV status of an SV.
669 =for apidoc Am|SV*|SvRV|SV* sv
670 Dereferences an RV to return the SV.
672 =for apidoc Am|IV|SvIVX|SV* sv
673 Returns the raw value in the SV's IV slot, without checks or conversions.
674 Only use when you are sure SvIOK is true. See also C<SvIV()>.
676 =for apidoc Am|UV|SvUVX|SV* sv
677 Returns the raw value in the SV's UV slot, without checks or conversions.
678 Only use when you are sure SvIOK is true. See also C<SvUV()>.
680 =for apidoc Am|NV|SvNVX|SV* sv
681 Returns the raw value in the SV's NV slot, without checks or conversions.
682 Only use when you are sure SvNOK is true. See also C<SvNV()>.
684 =for apidoc Am|char*|SvPVX|SV* sv
685 Returns a pointer to the physical string in the SV. The SV must contain a
688 This is also used to store the name of an autoloaded subroutine in an XS
689 AUTOLOAD routine. See L<perlguts/Autoloading with XSUBs>.
691 =for apidoc Am|STRLEN|SvCUR|SV* sv
692 Returns the length of the string which is in the SV. See C<SvLEN>.
694 =for apidoc Am|STRLEN|SvLEN|SV* sv
695 Returns the size of the string buffer in the SV, not including any part
696 attributable to C<SvOOK>. See C<SvCUR>.
698 =for apidoc Am|char*|SvEND|SV* sv
699 Returns a pointer to the spot just after the last character in
700 the string which is in the SV, where there is usually a trailing
701 null (even though Perl scalars do not strictly require it).
702 See C<SvCUR>. Access the character as *(SvEND(sv)).
704 Warning: If C<SvCUR> is equal to C<SvLEN>, then C<SvEND> points to
707 =for apidoc Am|HV*|SvSTASH|SV* sv
708 Returns the stash of the SV.
710 =for apidoc Am|void|SvIV_set|SV* sv|IV val
711 Set the value of the IV pointer in sv to val. It is possible to perform
712 the same function of this macro with an lvalue assignment to C<SvIVX>.
713 With future Perls, however, it will be more efficient to use
714 C<SvIV_set> instead of the lvalue assignment to C<SvIVX>.
716 =for apidoc Am|void|SvNV_set|SV* sv|NV val
717 Set the value of the NV pointer in sv to val. See C<SvIV_set>.
719 =for apidoc Am|void|SvPV_set|SV* sv|char* val
720 Set the value of the PV pointer in sv to val. See C<SvIV_set>.
722 =for apidoc Am|void|SvUV_set|SV* sv|UV val
723 Set the value of the UV pointer in sv to val. See C<SvIV_set>.
725 =for apidoc Am|void|SvRV_set|SV* sv|SV* val
726 Set the value of the RV pointer in sv to val. See C<SvIV_set>.
728 =for apidoc Am|void|SvMAGIC_set|SV* sv|MAGIC* val
729 Set the value of the MAGIC pointer in sv to val. See C<SvIV_set>.
731 =for apidoc Am|void|SvSTASH_set|SV* sv|HV* val
732 Set the value of the STASH pointer in sv to val. See C<SvIV_set>.
734 =for apidoc Am|void|SvCUR_set|SV* sv|STRLEN len
735 Set the current length of the string which is in the SV. See C<SvCUR>
738 =for apidoc Am|void|SvLEN_set|SV* sv|STRLEN len
739 Set the actual length of the string which is in the SV. See C<SvIV_set>.
744 #define SvNIOK(sv) (SvFLAGS(sv) & (SVf_IOK|SVf_NOK))
745 #define SvNIOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK))
746 #define SvNIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK| \
747 SVp_IOK|SVp_NOK|SVf_IVisUV))
749 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
750 #define assert_not_ROK(sv) ({assert(!SvROK(sv) || !SvRV(sv));}),
751 #define assert_not_glob(sv) ({assert(!isGV_with_GP(sv));}),
753 #define assert_not_ROK(sv)
754 #define assert_not_glob(sv)
757 #define SvOK(sv) ((SvTYPE(sv) == SVt_BIND) \
758 ? (SvFLAGS(SvRV(sv)) & SVf_OK) \
759 : (SvFLAGS(sv) & SVf_OK))
760 #define SvOK_off(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
761 SvFLAGS(sv) &= ~(SVf_OK| \
762 SVf_IVisUV|SVf_UTF8), \
764 #define SvOK_off_exc_UV(sv) (assert_not_ROK(sv) \
765 SvFLAGS(sv) &= ~(SVf_OK| \
769 #define SvOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK))
770 #define SvIOKp(sv) (SvFLAGS(sv) & SVp_IOK)
771 #define SvIOKp_on(sv) (assert_not_glob(sv) SvRELEASE_IVX_(sv) \
772 SvFLAGS(sv) |= SVp_IOK)
773 #define SvNOKp(sv) (SvFLAGS(sv) & SVp_NOK)
774 #define SvNOKp_on(sv) (assert_not_glob(sv) SvFLAGS(sv) |= SVp_NOK)
775 #define SvPOKp(sv) (SvFLAGS(sv) & SVp_POK)
776 #define SvPOKp_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
777 SvFLAGS(sv) |= SVp_POK)
779 #define SvIOK(sv) (SvFLAGS(sv) & SVf_IOK)
780 #define SvIOK_on(sv) (assert_not_glob(sv) SvRELEASE_IVX_(sv) \
781 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
782 #define SvIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVp_IOK|SVf_IVisUV))
783 #define SvIOK_only(sv) (SvOK_off(sv), \
784 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
785 #define SvIOK_only_UV(sv) (assert_not_glob(sv) SvOK_off_exc_UV(sv), \
786 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
788 #define SvIOK_UV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
789 == (SVf_IOK|SVf_IVisUV))
790 #define SvUOK(sv) SvIOK_UV(sv)
791 #define SvIOK_notUV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
794 #define SvIsUV(sv) (SvFLAGS(sv) & SVf_IVisUV)
795 #define SvIsUV_on(sv) (SvFLAGS(sv) |= SVf_IVisUV)
796 #define SvIsUV_off(sv) (SvFLAGS(sv) &= ~SVf_IVisUV)
798 #define SvNOK(sv) (SvFLAGS(sv) & SVf_NOK)
799 #define SvNOK_on(sv) (assert_not_glob(sv) \
800 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
801 #define SvNOK_off(sv) (SvFLAGS(sv) &= ~(SVf_NOK|SVp_NOK))
802 #define SvNOK_only(sv) (SvOK_off(sv), \
803 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
806 =for apidoc Am|U32|SvUTF8|SV* sv
807 Returns a U32 value indicating whether the SV contains UTF-8 encoded data.
808 Call this after SvPV() in case any call to string overloading updates the
811 =for apidoc Am|void|SvUTF8_on|SV *sv
812 Turn on the UTF-8 status of an SV (the data is not changed, just the flag).
813 Do not use frivolously.
815 =for apidoc Am|void|SvUTF8_off|SV *sv
816 Unsets the UTF-8 status of an SV.
818 =for apidoc Am|void|SvPOK_only_UTF8|SV* sv
819 Tells an SV that it is a string and disables all other OK bits,
820 and leaves the UTF-8 status as it was.
825 /* Ensure the return value of this macro does not clash with the GV_ADD* flags
827 #define SvUTF8(sv) (SvFLAGS(sv) & SVf_UTF8)
828 #define SvUTF8_on(sv) (SvFLAGS(sv) |= (SVf_UTF8))
829 #define SvUTF8_off(sv) (SvFLAGS(sv) &= ~(SVf_UTF8))
831 #define SvPOK(sv) (SvFLAGS(sv) & SVf_POK)
832 #define SvPOK_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
833 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
834 #define SvPOK_off(sv) (SvFLAGS(sv) &= ~(SVf_POK|SVp_POK))
835 #define SvPOK_only(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
836 SvFLAGS(sv) &= ~(SVf_OK| \
837 SVf_IVisUV|SVf_UTF8), \
838 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
839 #define SvPOK_only_UTF8(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
840 SvFLAGS(sv) &= ~(SVf_OK| \
842 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
844 #define SvVOK(sv) (SvMAGICAL(sv) \
845 && mg_find(sv,PERL_MAGIC_vstring))
846 /* returns the vstring magic, if any */
847 #define SvVSTRING_mg(sv) (SvMAGICAL(sv) \
848 ? mg_find(sv,PERL_MAGIC_vstring) : NULL)
850 #define SvOOK(sv) (SvFLAGS(sv) & SVf_OOK)
851 #define SvOOK_on(sv) ((void)SvIOK_off(sv), SvFLAGS(sv) |= SVf_OOK)
852 #define SvOOK_off(sv) ((void)(SvOOK(sv) && sv_backoff(sv)))
854 #define SvFAKE(sv) (SvFLAGS(sv) & SVf_FAKE)
855 #define SvFAKE_on(sv) (SvFLAGS(sv) |= SVf_FAKE)
856 #define SvFAKE_off(sv) (SvFLAGS(sv) &= ~SVf_FAKE)
858 #define SvROK(sv) (SvFLAGS(sv) & SVf_ROK)
859 #define SvROK_on(sv) (SvFLAGS(sv) |= SVf_ROK)
860 #define SvROK_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK))
862 #define SvMAGICAL(sv) (SvFLAGS(sv) & (SVs_GMG|SVs_SMG|SVs_RMG))
863 #define SvMAGICAL_on(sv) (SvFLAGS(sv) |= (SVs_GMG|SVs_SMG|SVs_RMG))
864 #define SvMAGICAL_off(sv) (SvFLAGS(sv) &= ~(SVs_GMG|SVs_SMG|SVs_RMG))
866 #define SvGMAGICAL(sv) (SvFLAGS(sv) & SVs_GMG)
867 #define SvGMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_GMG)
868 #define SvGMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_GMG)
870 #define SvSMAGICAL(sv) (SvFLAGS(sv) & SVs_SMG)
871 #define SvSMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_SMG)
872 #define SvSMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_SMG)
874 #define SvRMAGICAL(sv) (SvFLAGS(sv) & SVs_RMG)
875 #define SvRMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_RMG)
876 #define SvRMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_RMG)
878 #define SvAMAGIC(sv) (SvROK(sv) && (SvFLAGS(SvRV(sv)) & SVf_AMAGIC))
879 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
880 # define SvAMAGIC_on(sv) ({ SV * const kloink = sv; \
881 assert(SvROK(kloink)); \
882 SvFLAGS(SvRV(kloink)) |= SVf_AMAGIC; \
884 # define SvAMAGIC_off(sv) ({ SV * const kloink = sv; \
886 SvFLAGS(SvRV(kloink)) &= ~SVf_AMAGIC;\
889 # define SvAMAGIC_on(sv) (SvFLAGS(SvRV(sv)) |= SVf_AMAGIC)
890 # define SvAMAGIC_off(sv) \
891 (SvROK(sv) && (SvFLAGS(SvRV(sv)) &= ~SVf_AMAGIC))
895 =for apidoc Am|U32|SvGAMAGIC|SV* sv
897 Returns true if the SV has get magic or overloading. If either is true then
898 the scalar is active data, and has the potential to return a new value every
899 time it is accessed. Hence you must be careful to only read it once per user
900 logical operation and work with that returned value. If neither is true then
901 the scalar's value cannot change unless written to.
906 #define SvGAMAGIC(sv) (SvGMAGICAL(sv) || SvAMAGIC(sv))
908 #define Gv_AMG(stash) (PL_amagic_generation && Gv_AMupdate(stash, FALSE))
910 #define SvWEAKREF(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_WEAKREF)) \
911 == (SVf_ROK|SVprv_WEAKREF))
912 #define SvWEAKREF_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_WEAKREF))
913 #define SvWEAKREF_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_WEAKREF))
915 #define SvPCS_IMPORTED(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_PCS_IMPORTED)) \
916 == (SVf_ROK|SVprv_PCS_IMPORTED))
917 #define SvPCS_IMPORTED_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_PCS_IMPORTED))
918 #define SvPCS_IMPORTED_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_PCS_IMPORTED))
920 #define SvTHINKFIRST(sv) (SvFLAGS(sv) & SVf_THINKFIRST)
922 #define SvPADMY(sv) (SvFLAGS(sv) & SVs_PADMY)
923 #define SvPADMY_on(sv) (SvFLAGS(sv) |= SVs_PADMY)
925 /* SVs_PADTMP and SVs_PADSTALE share the same bit, mediated by SVs_PADMY */
927 #define SvPADTMP(sv) ((SvFLAGS(sv) & (SVs_PADMY|SVs_PADTMP)) == SVs_PADTMP)
928 #define SvPADSTALE(sv) ((SvFLAGS(sv) & (SVs_PADMY|SVs_PADSTALE)) \
929 == (SVs_PADMY|SVs_PADSTALE))
931 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
932 # define SvPADTMP_on(sv) ({ \
933 SV *const _svpad = MUTABLE_SV(sv); \
934 assert(!(SvFLAGS(_svpad) & SVs_PADMY)); \
935 SvFLAGS(_svpad) |= SVs_PADTMP; \
937 # define SvPADTMP_off(sv) ({ \
938 SV *const _svpad = MUTABLE_SV(sv); \
939 assert(!(SvFLAGS(_svpad) & SVs_PADMY)); \
940 SvFLAGS(_svpad) &= ~SVs_PADTMP; \
942 # define SvPADSTALE_on(sv) ({ \
943 SV *const _svpad = MUTABLE_SV(sv); \
944 assert(SvFLAGS(_svpad) & SVs_PADMY); \
945 SvFLAGS(_svpad) |= SVs_PADSTALE; \
947 # define SvPADSTALE_off(sv) ({ \
948 SV *const _svpad = MUTABLE_SV(sv); \
949 assert(SvFLAGS(_svpad) & SVs_PADMY); \
950 SvFLAGS(_svpad) &= ~SVs_PADSTALE; \
953 # define SvPADTMP_on(sv) (SvFLAGS(sv) |= SVs_PADTMP)
954 # define SvPADTMP_off(sv) (SvFLAGS(sv) &= ~SVs_PADTMP)
955 # define SvPADSTALE_on(sv) (SvFLAGS(sv) |= SVs_PADSTALE)
956 # define SvPADSTALE_off(sv) (SvFLAGS(sv) &= ~SVs_PADSTALE)
959 #define SvTEMP(sv) (SvFLAGS(sv) & SVs_TEMP)
960 #define SvTEMP_on(sv) (SvFLAGS(sv) |= SVs_TEMP)
961 #define SvTEMP_off(sv) (SvFLAGS(sv) &= ~SVs_TEMP)
963 #define SvOBJECT(sv) (SvFLAGS(sv) & SVs_OBJECT)
964 #define SvOBJECT_on(sv) (SvFLAGS(sv) |= SVs_OBJECT)
965 #define SvOBJECT_off(sv) (SvFLAGS(sv) &= ~SVs_OBJECT)
967 #define SvREADONLY(sv) (SvFLAGS(sv) & SVf_READONLY)
968 #define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
969 #define SvREADONLY_off(sv) (SvFLAGS(sv) &= ~SVf_READONLY)
971 #define SvSCREAM(sv) ((SvFLAGS(sv) & (SVp_SCREAM|SVp_POK)) == (SVp_SCREAM|SVp_POK))
972 #define SvSCREAM_on(sv) (SvFLAGS(sv) |= SVp_SCREAM)
973 #define SvSCREAM_off(sv) (SvFLAGS(sv) &= ~SVp_SCREAM)
976 # define SvCOMPILED(sv) 0
977 # define SvCOMPILED_on(sv)
978 # define SvCOMPILED_off(sv)
981 #define SvEVALED(sv) (SvFLAGS(sv) & SVrepl_EVAL)
982 #define SvEVALED_on(sv) (SvFLAGS(sv) |= SVrepl_EVAL)
983 #define SvEVALED_off(sv) (SvFLAGS(sv) &= ~SVrepl_EVAL)
985 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
986 # define SvVALID(sv) ({ const SV *const _svvalid = (const SV*)(sv); \
987 if (SvFLAGS(_svvalid) & SVpbm_VALID) \
988 assert(!isGV_with_GP(_svvalid)); \
989 (SvFLAGS(_svvalid) & SVpbm_VALID); \
991 # define SvVALID_on(sv) ({ SV *const _svvalid = MUTABLE_SV(sv); \
992 assert(!isGV_with_GP(_svvalid)); \
993 (SvFLAGS(_svvalid) |= SVpbm_VALID); \
995 # define SvVALID_off(sv) ({ SV *const _svvalid = MUTABLE_SV(sv); \
996 assert(!isGV_with_GP(_svvalid)); \
997 (SvFLAGS(_svvalid) &= ~SVpbm_VALID); \
1000 # define SvTAIL(sv) ({ const SV *const _svtail = (const SV *)(sv); \
1001 assert(SvTYPE(_svtail) != SVt_PVAV); \
1002 assert(SvTYPE(_svtail) != SVt_PVHV); \
1003 (SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
1004 == (SVpbm_TAIL|SVpbm_VALID); \
1007 # define SvVALID(sv) (SvFLAGS(sv) & SVpbm_VALID)
1008 # define SvVALID_on(sv) (SvFLAGS(sv) |= SVpbm_VALID)
1009 # define SvVALID_off(sv) (SvFLAGS(sv) &= ~SVpbm_VALID)
1010 # define SvTAIL(sv) ((SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
1011 == (SVpbm_TAIL|SVpbm_VALID))
1014 #define SvTAIL_on(sv) (SvFLAGS(sv) |= SVpbm_TAIL)
1015 #define SvTAIL_off(sv) (SvFLAGS(sv) &= ~SVpbm_TAIL)
1018 #define SvPAD_TYPED(sv) \
1019 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_TYPED)) == (SVpad_NAME|SVpad_TYPED))
1021 #define SvPAD_OUR(sv) \
1022 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_OUR)) == (SVpad_NAME|SVpad_OUR))
1024 #define SvPAD_STATE(sv) \
1025 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_STATE)) == (SVpad_NAME|SVpad_STATE))
1027 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1028 # define SvPAD_TYPED_on(sv) ({ \
1029 SV *const _svpad = MUTABLE_SV(sv); \
1030 assert(SvTYPE(_svpad) == SVt_PVMG); \
1031 (SvFLAGS(_svpad) |= SVpad_NAME|SVpad_TYPED); \
1033 #define SvPAD_OUR_on(sv) ({ \
1034 SV *const _svpad = MUTABLE_SV(sv); \
1035 assert(SvTYPE(_svpad) == SVt_PVMG); \
1036 (SvFLAGS(_svpad) |= SVpad_NAME|SVpad_OUR); \
1038 #define SvPAD_STATE_on(sv) ({ \
1039 SV *const _svpad = MUTABLE_SV(sv); \
1040 assert(SvTYPE(_svpad) == SVt_PVNV || SvTYPE(_svpad) == SVt_PVMG); \
1041 (SvFLAGS(_svpad) |= SVpad_NAME|SVpad_STATE); \
1044 # define SvPAD_TYPED_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_TYPED)
1045 # define SvPAD_OUR_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_OUR)
1046 # define SvPAD_STATE_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_STATE)
1049 #define SvOURSTASH(sv) \
1050 (SvPAD_OUR(sv) ? ((XPVMG*) SvANY(sv))->xmg_u.xmg_ourstash : NULL)
1051 #define SvOURSTASH_set(sv, st) \
1053 assert(SvTYPE(sv) == SVt_PVMG); \
1054 ((XPVMG*) SvANY(sv))->xmg_u.xmg_ourstash = st; \
1057 #define SvRVx(sv) SvRV(sv)
1059 #ifdef PERL_DEBUG_COW
1060 /* Need -0.0 for SvNVX to preserve IEEE FP "negative zero" because
1061 +0.0 + -0.0 => +0.0 but -0.0 + -0.0 => -0.0 */
1062 # define SvIVX(sv) (0 + ((XPVIV*) SvANY(sv))->xiv_iv)
1063 # define SvUVX(sv) (0 + ((XPVUV*) SvANY(sv))->xuv_uv)
1064 # define SvNVX(sv) (-0.0 + ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv)
1065 # define SvRV(sv) (0 + (sv)->sv_u.svu_rv)
1066 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1067 /* Don't test the core XS code yet. */
1068 # if defined (PERL_CORE) && PERL_DEBUG_COW > 1
1069 # define SvPVX(sv) (0 + (assert(!SvREADONLY(sv)), (sv)->sv_u.svu_pv))
1071 # define SvPVX(sv) SvPVX_mutable(sv)
1073 # define SvCUR(sv) (0 + ((XPV*) SvANY(sv))->xpv_cur)
1074 # define SvLEN(sv) (0 + ((XPV*) SvANY(sv))->xpv_len)
1075 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1078 # define SvMAGIC(sv) (0 + *(assert(SvTYPE(sv) >= SVt_PVMG), &((XPVMG*) SvANY(sv))->xmg_u.xmg_magic))
1079 # define SvSTASH(sv) (0 + *(assert(SvTYPE(sv) >= SVt_PVMG), &((XPVMG*) SvANY(sv))->xmg_stash))
1081 # define SvMAGIC(sv) (0 + ((XPVMG*) SvANY(sv))->xmg_u.xmg_magic)
1082 # define SvSTASH(sv) (0 + ((XPVMG*) SvANY(sv))->xmg_stash)
1085 # define SvLEN(sv) ((XPV*) SvANY(sv))->xpv_len
1086 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1088 # if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1089 /* These get expanded inside other macros that already use a variable _sv */
1090 # define SvPVX(sv) \
1091 (*({ SV *const _svpvx = MUTABLE_SV(sv); \
1092 assert(PL_valid_types_PVX[SvTYPE(_svpvx) & SVt_MASK]); \
1093 assert(!isGV_with_GP(_svpvx)); \
1094 assert(!(SvTYPE(_svpvx) == SVt_PVIO \
1095 && !(IoFLAGS(_svpvx) & IOf_FAKE_DIRP))); \
1096 &((_svpvx)->sv_u.svu_pv); \
1098 # define SvCUR(sv) \
1099 (*({ const SV *const _svcur = (const SV *)(sv); \
1100 assert(PL_valid_types_PVX[SvTYPE(_svcur) & SVt_MASK]); \
1101 assert(!isGV_with_GP(_svcur)); \
1102 assert(!(SvTYPE(_svcur) == SVt_PVIO \
1103 && !(IoFLAGS(_svcur) & IOf_FAKE_DIRP))); \
1104 &(((XPV*) MUTABLE_PTR(SvANY(_svcur)))->xpv_cur); \
1106 # define SvIVX(sv) \
1107 (*({ const SV *const _svivx = (const SV *)(sv); \
1108 assert(PL_valid_types_IVX[SvTYPE(_svivx) & SVt_MASK]); \
1109 assert(!isGV_with_GP(_svivx)); \
1110 &(((XPVIV*) MUTABLE_PTR(SvANY(_svivx)))->xiv_iv); \
1112 # define SvUVX(sv) \
1113 (*({ const SV *const _svuvx = (const SV *)(sv); \
1114 assert(PL_valid_types_IVX[SvTYPE(_svuvx) & SVt_MASK]); \
1115 assert(!isGV_with_GP(_svuvx)); \
1116 &(((XPVUV*) MUTABLE_PTR(SvANY(_svuvx)))->xuv_uv); \
1118 # define SvNVX(sv) \
1119 (*({ const SV *const _svnvx = (const SV *)(sv); \
1120 assert(PL_valid_types_NVX[SvTYPE(_svnvx) & SVt_MASK]); \
1121 assert(!isGV_with_GP(_svnvx)); \
1122 &(((XPVNV*) MUTABLE_PTR(SvANY(_svnvx)))->xnv_u.xnv_nv); \
1125 (*({ SV *const _svrv = MUTABLE_SV(sv); \
1126 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1127 assert(!isGV_with_GP(_svrv)); \
1128 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1129 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1130 &((_svrv)->sv_u.svu_rv); \
1132 # define SvRV_const(sv) \
1133 ({ const SV *const _svrv = (const SV *)(sv); \
1134 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1135 assert(!isGV_with_GP(_svrv)); \
1136 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1137 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1138 (_svrv)->sv_u.svu_rv; \
1140 # define SvMAGIC(sv) \
1141 (*({ const SV *const _svmagic = (const SV *)(sv); \
1142 assert(SvTYPE(_svmagic) >= SVt_PVMG); \
1143 if(SvTYPE(_svmagic) == SVt_PVMG) \
1144 assert(!SvPAD_OUR(_svmagic)); \
1145 &(((XPVMG*) MUTABLE_PTR(SvANY(_svmagic)))->xmg_u.xmg_magic); \
1147 # define SvSTASH(sv) \
1148 (*({ const SV *const _svstash = (const SV *)(sv); \
1149 assert(SvTYPE(_svstash) >= SVt_PVMG); \
1150 &(((XPVMG*) MUTABLE_PTR(SvANY(_svstash)))->xmg_stash); \
1153 # define SvPVX(sv) ((sv)->sv_u.svu_pv)
1154 # define SvCUR(sv) ((XPV*) SvANY(sv))->xpv_cur
1155 # define SvIVX(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1156 # define SvUVX(sv) ((XPVUV*) SvANY(sv))->xuv_uv
1157 # define SvNVX(sv) ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv
1158 # define SvRV(sv) ((sv)->sv_u.svu_rv)
1159 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1160 # define SvMAGIC(sv) ((XPVMG*) SvANY(sv))->xmg_u.xmg_magic
1161 # define SvSTASH(sv) ((XPVMG*) SvANY(sv))->xmg_stash
1166 /* Given that these two are new, there can't be any existing code using them
1168 # define SvPVX_mutable(sv) (0 + (sv)->sv_u.svu_pv)
1169 # define SvPVX_const(sv) ((const char*)(0 + (sv)->sv_u.svu_pv))
1171 /* Except for the poison code, which uses & to scribble over the pointer after
1172 free() is called. */
1173 # define SvPVX_mutable(sv) ((sv)->sv_u.svu_pv)
1174 # define SvPVX_const(sv) ((const char*)((sv)->sv_u.svu_pv))
1177 #define SvIVXx(sv) SvIVX(sv)
1178 #define SvUVXx(sv) SvUVX(sv)
1179 #define SvNVXx(sv) SvNVX(sv)
1180 #define SvPVXx(sv) SvPVX(sv)
1181 #define SvLENx(sv) SvLEN(sv)
1182 #define SvENDx(sv) ((PL_Sv = (sv)), SvEND(PL_Sv))
1185 /* Ask a scalar nicely to try to become an IV, if possible.
1186 Not guaranteed to stay returning void */
1187 /* Macro won't actually call sv_2iv if already IOK */
1188 #define SvIV_please(sv) \
1189 STMT_START {if (!SvIOKp(sv) && (SvNOK(sv) || SvPOK(sv))) \
1190 (void) SvIV(sv); } STMT_END
1191 #define SvIV_please_nomg(sv) \
1192 STMT_START {if (!SvIOKp(sv) && (SvNOK(sv) || SvPOK(sv))) \
1193 (void) SvIV_nomg(sv); } STMT_END
1194 #define SvIV_set(sv, val) \
1196 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1197 assert(!isGV_with_GP(sv)); \
1198 (((XPVIV*) SvANY(sv))->xiv_iv = (val)); } STMT_END
1199 #define SvNV_set(sv, val) \
1201 assert(PL_valid_types_NV_set[SvTYPE(sv) & SVt_MASK]); \
1202 assert(!isGV_with_GP(sv)); \
1203 (((XPVNV*)SvANY(sv))->xnv_u.xnv_nv = (val)); } STMT_END
1204 #define SvPV_set(sv, val) \
1206 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1207 assert(!isGV_with_GP(sv)); \
1208 assert(!(SvTYPE(sv) == SVt_PVIO \
1209 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1210 ((sv)->sv_u.svu_pv = (val)); } STMT_END
1211 #define SvUV_set(sv, val) \
1213 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1214 assert(!isGV_with_GP(sv)); \
1215 (((XPVUV*)SvANY(sv))->xuv_uv = (val)); } STMT_END
1216 #define SvRV_set(sv, val) \
1218 assert(PL_valid_types_RV[SvTYPE(sv) & SVt_MASK]); \
1219 assert(!isGV_with_GP(sv)); \
1220 assert(!(SvTYPE(sv) == SVt_PVIO \
1221 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1222 ((sv)->sv_u.svu_rv = (val)); } STMT_END
1223 #define SvMAGIC_set(sv, val) \
1224 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1225 (((XPVMG*)SvANY(sv))->xmg_u.xmg_magic = (val)); } STMT_END
1226 #define SvSTASH_set(sv, val) \
1227 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1228 (((XPVMG*) SvANY(sv))->xmg_stash = (val)); } STMT_END
1229 #define SvCUR_set(sv, val) \
1231 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1232 assert(!isGV_with_GP(sv)); \
1233 assert(!(SvTYPE(sv) == SVt_PVIO \
1234 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1235 (((XPV*) SvANY(sv))->xpv_cur = (val)); } STMT_END
1236 #define SvLEN_set(sv, val) \
1238 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1239 assert(!isGV_with_GP(sv)); \
1240 assert(!(SvTYPE(sv) == SVt_PVIO \
1241 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1242 (((XPV*) SvANY(sv))->xpv_len = (val)); } STMT_END
1243 #define SvEND_set(sv, val) \
1244 STMT_START { assert(SvTYPE(sv) >= SVt_PV); \
1245 SvCUR_set(sv, (val) - SvPVX(sv)); } STMT_END
1247 #define SvPV_renew(sv,n) \
1248 STMT_START { SvLEN_set(sv, n); \
1249 SvPV_set((sv), (MEM_WRAP_CHECK_(n,char) \
1250 (char*)saferealloc((Malloc_t)SvPVX(sv), \
1251 (MEM_SIZE)((n))))); \
1254 #define SvPV_shrink_to_cur(sv) STMT_START { \
1255 const STRLEN _lEnGtH = SvCUR(sv) + 1; \
1256 SvPV_renew(sv, _lEnGtH); \
1259 #define SvPV_free(sv) \
1261 assert(SvTYPE(sv) >= SVt_PV); \
1263 assert(!SvROK(sv)); \
1266 SvOOK_offset(sv, zok); \
1267 SvPV_set(sv, SvPVX_mutable(sv) - zok); \
1268 SvFLAGS(sv) &= ~SVf_OOK; \
1270 Safefree(SvPVX(sv)); \
1275 /* Code that crops up in three places to take a scalar and ready it to hold
1277 # define prepare_SV_for_RV(sv) \
1279 if (SvTYPE(sv) < SVt_PV && SvTYPE(sv) != SVt_IV) \
1280 sv_upgrade(sv, SVt_IV); \
1281 else if (SvTYPE(sv) >= SVt_PV) { \
1289 /* SvPOKp not SvPOK in the assertion because the string can be tainted! eg
1294 # define BmFLAGS(sv) (SvTAIL(sv) ? FBMcf_TAIL : 0)
1297 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1298 # define BmRARE(sv) \
1299 (*({ SV *const _bmrare = MUTABLE_SV(sv); \
1300 assert(SvTYPE(_bmrare) == SVt_PVMG); \
1301 assert(SvVALID(_bmrare)); \
1302 &(((XPVMG*) SvANY(_bmrare))->xnv_u.xbm_s.xbm_rare); \
1304 # define BmUSEFUL(sv) \
1305 (*({ SV *const _bmuseful = MUTABLE_SV(sv); \
1306 assert(SvTYPE(_bmuseful) == SVt_PVMG); \
1307 assert(SvVALID(_bmuseful)); \
1308 assert(!SvIOK(_bmuseful)); \
1309 &(((XPVMG*) SvANY(_bmuseful))->xnv_u.xbm_s.xbm_useful); \
1311 # define BmPREVIOUS(sv) \
1312 (*({ SV *const _bmprevious = MUTABLE_SV(sv); \
1313 assert(SvTYPE(_bmprevious) == SVt_PVMG); \
1314 assert(SvVALID(_bmprevious)); \
1315 &(((XPVMG*) SvANY(_bmprevious))->xiv_u.xivu_uv); \
1318 # define BmRARE(sv) ((XPVMG*) SvANY(sv))->xnv_u.xbm_s.xbm_rare
1319 # define BmUSEFUL(sv) ((XPVMG*) SvANY(sv))->xnv_u.xbm_s.xbm_useful
1320 # define BmPREVIOUS(sv) ((XPVMG*) SvANY(sv))->xiv_u.xivu_uv
1324 #define FmLINES(sv) ((XPVFM*) SvANY(sv))->xfm_lines
1326 #define LvTYPE(sv) ((XPVLV*) SvANY(sv))->xlv_type
1327 #define LvTARG(sv) ((XPVLV*) SvANY(sv))->xlv_targ
1328 #define LvTARGOFF(sv) ((XPVLV*) SvANY(sv))->xlv_targoff
1329 #define LvTARGLEN(sv) ((XPVLV*) SvANY(sv))->xlv_targlen
1331 #define IoIFP(sv) (sv)->sv_u.svu_fp
1332 #define IoOFP(sv) ((XPVIO*) SvANY(sv))->xio_ofp
1333 #define IoDIRP(sv) ((XPVIO*) SvANY(sv))->xio_dirp
1334 #define IoANY(sv) ((XPVIO*) SvANY(sv))->xio_any
1335 #define IoLINES(sv) ((XPVIO*) SvANY(sv))->xiv_u.xivu_iv
1336 #define IoPAGE(sv) ((XPVIO*) SvANY(sv))->xio_page
1337 #define IoPAGE_LEN(sv) ((XPVIO*) SvANY(sv))->xio_page_len
1338 #define IoLINES_LEFT(sv)((XPVIO*) SvANY(sv))->xio_lines_left
1339 #define IoTOP_NAME(sv) ((XPVIO*) SvANY(sv))->xio_top_name
1340 #define IoTOP_GV(sv) ((XPVIO*) SvANY(sv))->xio_top_gv
1341 #define IoFMT_NAME(sv) ((XPVIO*) SvANY(sv))->xio_fmt_name
1342 #define IoFMT_GV(sv) ((XPVIO*) SvANY(sv))->xio_fmt_gv
1343 #define IoBOTTOM_NAME(sv)((XPVIO*) SvANY(sv))->xio_bottom_name
1344 #define IoBOTTOM_GV(sv) ((XPVIO*) SvANY(sv))->xio_bottom_gv
1345 #define IoTYPE(sv) ((XPVIO*) SvANY(sv))->xio_type
1346 #define IoFLAGS(sv) ((XPVIO*) SvANY(sv))->xio_flags
1348 /* IoTYPE(sv) is a single character telling the type of I/O connection. */
1349 #define IoTYPE_RDONLY '<'
1350 #define IoTYPE_WRONLY '>'
1351 #define IoTYPE_RDWR '+'
1352 #define IoTYPE_APPEND 'a'
1353 #define IoTYPE_PIPE '|'
1354 #define IoTYPE_STD '-' /* stdin or stdout */
1355 #define IoTYPE_SOCKET 's'
1356 #define IoTYPE_CLOSED ' '
1357 #define IoTYPE_IMPLICIT 'I' /* stdin or stdout or stderr */
1358 #define IoTYPE_NUMERIC '#' /* fdopen */
1361 =for apidoc Am|bool|SvTAINTED|SV* sv
1362 Checks to see if an SV is tainted. Returns TRUE if it is, FALSE if
1365 =for apidoc Am|void|SvTAINTED_on|SV* sv
1366 Marks an SV as tainted if tainting is enabled.
1368 =for apidoc Am|void|SvTAINTED_off|SV* sv
1369 Untaints an SV. Be I<very> careful with this routine, as it short-circuits
1370 some of Perl's fundamental security features. XS module authors should not
1371 use this function unless they fully understand all the implications of
1372 unconditionally untainting the value. Untainting should be done in the
1373 standard perl fashion, via a carefully crafted regexp, rather than directly
1374 untainting variables.
1376 =for apidoc Am|void|SvTAINT|SV* sv
1377 Taints an SV if tainting is enabled.
1382 #define sv_taint(sv) sv_magic((sv), NULL, PERL_MAGIC_taint, NULL, 0)
1384 #define SvTAINTED(sv) (SvMAGICAL(sv) && sv_tainted(sv))
1385 #define SvTAINTED_on(sv) STMT_START{ if(PL_tainting){sv_taint(sv);} }STMT_END
1386 #define SvTAINTED_off(sv) STMT_START{ if(PL_tainting){sv_untaint(sv);} }STMT_END
1388 #define SvTAINT(sv) \
1390 if (PL_tainting) { \
1397 =for apidoc Am|char*|SvPV_force|SV* sv|STRLEN len
1398 Like C<SvPV> but will force the SV into containing just a string
1399 (C<SvPOK_only>). You want force if you are going to update the C<SvPVX>
1402 =for apidoc Am|char*|SvPV_force_nomg|SV* sv|STRLEN len
1403 Like C<SvPV> but will force the SV into containing just a string
1404 (C<SvPOK_only>). You want force if you are going to update the C<SvPVX>
1405 directly. Doesn't process magic.
1407 =for apidoc Am|char*|SvPV|SV* sv|STRLEN len
1408 Returns a pointer to the string in the SV, or a stringified form of
1409 the SV if the SV does not contain a string. The SV may cache the
1410 stringified version becoming C<SvPOK>. Handles 'get' magic. See also
1411 C<SvPVx> for a version which guarantees to evaluate sv only once.
1413 =for apidoc Am|char*|SvPVx|SV* sv|STRLEN len
1414 A version of C<SvPV> which guarantees to evaluate C<sv> only once.
1415 Only use this if C<sv> is an expression with side effects, otherwise use the
1416 more efficient C<SvPVX>.
1418 =for apidoc Am|char*|SvPV_nomg|SV* sv|STRLEN len
1419 Like C<SvPV> but doesn't process magic.
1421 =for apidoc Am|char*|SvPV_nolen|SV* sv
1422 Returns a pointer to the string in the SV, or a stringified form of
1423 the SV if the SV does not contain a string. The SV may cache the
1424 stringified form becoming C<SvPOK>. Handles 'get' magic.
1426 =for apidoc Am|char*|SvPV_nomg_nolen|SV* sv
1427 Like C<SvPV_nolen> but doesn't process magic.
1429 =for apidoc Am|IV|SvIV|SV* sv
1430 Coerces the given SV to an integer and returns it. See C<SvIVx> for a
1431 version which guarantees to evaluate sv only once.
1433 =for apidoc Am|IV|SvIV_nomg|SV* sv
1434 Like C<SvIV> but doesn't process magic.
1436 =for apidoc Am|IV|SvIVx|SV* sv
1437 Coerces the given SV to an integer and returns it. Guarantees to evaluate
1438 C<sv> only once. Only use this if C<sv> is an expression with side effects,
1439 otherwise use the more efficient C<SvIV>.
1441 =for apidoc Am|NV|SvNV|SV* sv
1442 Coerce the given SV to a double and return it. See C<SvNVx> for a version
1443 which guarantees to evaluate sv only once.
1445 =for apidoc Am|NV|SvNV_nomg|SV* sv
1446 Like C<SvNV> but doesn't process magic.
1448 =for apidoc Am|NV|SvNVx|SV* sv
1449 Coerces the given SV to a double and returns it. Guarantees to evaluate
1450 C<sv> only once. Only use this if C<sv> is an expression with side effects,
1451 otherwise use the more efficient C<SvNV>.
1453 =for apidoc Am|UV|SvUV|SV* sv
1454 Coerces the given SV to an unsigned integer and returns it. See C<SvUVx>
1455 for a version which guarantees to evaluate sv only once.
1457 =for apidoc Am|UV|SvUV_nomg|SV* sv
1458 Like C<SvUV> but doesn't process magic.
1460 =for apidoc Am|UV|SvUVx|SV* sv
1461 Coerces the given SV to an unsigned integer and returns it. Guarantees to
1462 C<sv> only once. Only use this if C<sv> is an expression with side effects,
1463 otherwise use the more efficient C<SvUV>.
1465 =for apidoc Am|bool|SvTRUE|SV* sv
1466 Returns a boolean indicating whether Perl would evaluate the SV as true or
1467 false. See SvOK() for a defined/undefined test. Handles 'get' magic
1468 unless the scalar is already SvPOK, SvIOK or SvNOK (the public, not the
1471 =for apidoc Am|bool|SvTRUE_nomg|SV* sv
1472 Returns a boolean indicating whether Perl would evaluate the SV as true or
1473 false. See SvOK() for a defined/undefined test. Does not handle 'get' magic.
1475 =for apidoc Am|char*|SvPVutf8_force|SV* sv|STRLEN len
1476 Like C<SvPV_force>, but converts sv to utf8 first if necessary.
1478 =for apidoc Am|char*|SvPVutf8|SV* sv|STRLEN len
1479 Like C<SvPV>, but converts sv to utf8 first if necessary.
1481 =for apidoc Am|char*|SvPVutf8_nolen|SV* sv
1482 Like C<SvPV_nolen>, but converts sv to utf8 first if necessary.
1484 =for apidoc Am|char*|SvPVbyte_force|SV* sv|STRLEN len
1485 Like C<SvPV_force>, but converts sv to byte representation first if necessary.
1487 =for apidoc Am|char*|SvPVbyte|SV* sv|STRLEN len
1488 Like C<SvPV>, but converts sv to byte representation first if necessary.
1490 =for apidoc Am|char*|SvPVbyte_nolen|SV* sv
1491 Like C<SvPV_nolen>, but converts sv to byte representation first if necessary.
1493 =for apidoc Am|char*|SvPVutf8x_force|SV* sv|STRLEN len
1494 Like C<SvPV_force>, but converts sv to utf8 first if necessary.
1495 Guarantees to evaluate sv only once; use the more efficient C<SvPVutf8_force>
1498 =for apidoc Am|char*|SvPVutf8x|SV* sv|STRLEN len
1499 Like C<SvPV>, but converts sv to utf8 first if necessary.
1500 Guarantees to evaluate sv only once; use the more efficient C<SvPVutf8>
1503 =for apidoc Am|char*|SvPVbytex_force|SV* sv|STRLEN len
1504 Like C<SvPV_force>, but converts sv to byte representation first if necessary.
1505 Guarantees to evaluate sv only once; use the more efficient C<SvPVbyte_force>
1508 =for apidoc Am|char*|SvPVbytex|SV* sv|STRLEN len
1509 Like C<SvPV>, but converts sv to byte representation first if necessary.
1510 Guarantees to evaluate sv only once; use the more efficient C<SvPVbyte>
1513 =for apidoc Am|bool|SvIsCOW|SV* sv
1514 Returns a boolean indicating whether the SV is Copy-On-Write. (either shared
1515 hash key scalars, or full Copy On Write scalars if 5.9.0 is configured for
1518 =for apidoc Am|bool|SvIsCOW_shared_hash|SV* sv
1519 Returns a boolean indicating whether the SV is Copy-On-Write shared hash key
1522 =for apidoc Am|void|sv_catpvn_nomg|SV* sv|const char* ptr|STRLEN len
1523 Like C<sv_catpvn> but doesn't process magic.
1525 =for apidoc Am|void|sv_catpv_nomg|SV* sv|const char* ptr
1526 Like C<sv_catpv> but doesn't process magic.
1528 =for apidoc Am|void|sv_setsv_nomg|SV* dsv|SV* ssv
1529 Like C<sv_setsv> but doesn't process magic.
1531 =for apidoc Am|void|sv_catsv_nomg|SV* dsv|SV* ssv
1532 Like C<sv_catsv> but doesn't process magic.
1534 =for apidoc Amdb|STRLEN|sv_utf8_upgrade_nomg|NN SV *sv
1536 Like sv_utf8_upgrade, but doesn't do magic on C<sv>
1541 /* Let us hope that bitmaps for UV and IV are the same */
1542 #define SvIV(sv) (SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv))
1543 #define SvUV(sv) (SvIOK(sv) ? SvUVX(sv) : sv_2uv(sv))
1544 #define SvNV(sv) (SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv))
1546 #define SvIV_nomg(sv) (SvIOK(sv) ? SvIVX(sv) : sv_2iv_flags(sv, 0))
1547 #define SvUV_nomg(sv) (SvIOK(sv) ? SvUVX(sv) : sv_2uv_flags(sv, 0))
1548 #define SvNV_nomg(sv) (SvNOK(sv) ? SvNVX(sv) : sv_2nv_flags(sv, 0))
1552 #define SvPV(sv, lp) SvPV_flags(sv, lp, SV_GMAGIC)
1553 #define SvPV_const(sv, lp) SvPV_flags_const(sv, lp, SV_GMAGIC)
1554 #define SvPV_mutable(sv, lp) SvPV_flags_mutable(sv, lp, SV_GMAGIC)
1556 #define SvPV_flags(sv, lp, flags) \
1557 ((SvFLAGS(sv) & (SVf_POK)) == SVf_POK \
1558 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pv_flags(sv, &lp, flags))
1559 #define SvPV_flags_const(sv, lp, flags) \
1560 ((SvFLAGS(sv) & (SVf_POK)) == SVf_POK \
1561 ? ((lp = SvCUR(sv)), SvPVX_const(sv)) : \
1562 (const char*) sv_2pv_flags(sv, &lp, flags|SV_CONST_RETURN))
1563 #define SvPV_flags_const_nolen(sv, flags) \
1564 ((SvFLAGS(sv) & (SVf_POK)) == SVf_POK \
1565 ? SvPVX_const(sv) : \
1566 (const char*) sv_2pv_flags(sv, 0, flags|SV_CONST_RETURN))
1567 #define SvPV_flags_mutable(sv, lp, flags) \
1568 ((SvFLAGS(sv) & (SVf_POK)) == SVf_POK \
1569 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) : \
1570 sv_2pv_flags(sv, &lp, flags|SV_MUTABLE_RETURN))
1572 #define SvPV_force(sv, lp) SvPV_force_flags(sv, lp, SV_GMAGIC)
1573 #define SvPV_force_nolen(sv) SvPV_force_flags_nolen(sv, SV_GMAGIC)
1574 #define SvPV_force_mutable(sv, lp) SvPV_force_flags_mutable(sv, lp, SV_GMAGIC)
1576 #define SvPV_force_nomg(sv, lp) SvPV_force_flags(sv, lp, 0)
1577 #define SvPV_force_nomg_nolen(sv) SvPV_force_flags_nolen(sv, 0)
1579 #define SvPV_force_flags(sv, lp, flags) \
1580 ((SvFLAGS(sv) & (SVf_POK|SVf_THINKFIRST)) == SVf_POK \
1581 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvn_force_flags(sv, &lp, flags))
1582 #define SvPV_force_flags_nolen(sv, flags) \
1583 ((SvFLAGS(sv) & (SVf_POK|SVf_THINKFIRST)) == SVf_POK \
1584 ? SvPVX(sv) : sv_pvn_force_flags(sv, 0, flags))
1585 #define SvPV_force_flags_mutable(sv, lp, flags) \
1586 ((SvFLAGS(sv) & (SVf_POK|SVf_THINKFIRST)) == SVf_POK \
1587 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) \
1588 : sv_pvn_force_flags(sv, &lp, flags|SV_MUTABLE_RETURN))
1590 #define SvPV_nolen(sv) \
1591 ((SvFLAGS(sv) & (SVf_POK)) == SVf_POK \
1592 ? SvPVX(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC))
1594 #define SvPV_nomg_nolen(sv) \
1595 ((SvFLAGS(sv) & (SVf_POK)) == SVf_POK \
1596 ? SvPVX(sv) : sv_2pv_flags(sv, 0, 0))
1598 #define SvPV_nolen_const(sv) \
1599 ((SvFLAGS(sv) & (SVf_POK)) == SVf_POK \
1600 ? SvPVX_const(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC|SV_CONST_RETURN))
1602 #define SvPV_nomg(sv, lp) SvPV_flags(sv, lp, 0)
1603 #define SvPV_nomg_const(sv, lp) SvPV_flags_const(sv, lp, 0)
1604 #define SvPV_nomg_const_nolen(sv) SvPV_flags_const_nolen(sv, 0)
1608 #define SvPVutf8(sv, lp) \
1609 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8)) == (SVf_POK|SVf_UTF8) \
1610 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvutf8(sv, &lp))
1612 #define SvPVutf8_force(sv, lp) \
1613 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST)) == (SVf_POK|SVf_UTF8) \
1614 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvutf8n_force(sv, &lp))
1617 #define SvPVutf8_nolen(sv) \
1618 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8)) == (SVf_POK|SVf_UTF8)\
1619 ? SvPVX(sv) : sv_2pvutf8(sv, 0))
1623 #define SvPVbyte(sv, lp) \
1624 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8)) == (SVf_POK) \
1625 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvbyte(sv, &lp))
1627 #define SvPVbyte_force(sv, lp) \
1628 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST)) == (SVf_POK) \
1629 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvbyten_force(sv, &lp))
1631 #define SvPVbyte_nolen(sv) \
1632 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8)) == (SVf_POK)\
1633 ? SvPVX(sv) : sv_2pvbyte(sv, 0))
1637 /* define FOOx(): idempotent versions of FOO(). If possible, use a local
1638 * var to evaluate the arg once; failing that, use a global if possible;
1639 * failing that, call a function to do the work
1642 #define SvPVx_force(sv, lp) sv_pvn_force(sv, &lp)
1643 #define SvPVutf8x_force(sv, lp) sv_pvutf8n_force(sv, &lp)
1644 #define SvPVbytex_force(sv, lp) sv_pvbyten_force(sv, &lp)
1646 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1648 # define SvIVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvIV(_sv); })
1649 # define SvUVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvUV(_sv); })
1650 # define SvNVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvNV(_sv); })
1651 # define SvPVx(sv, lp) ({SV *_sv = (sv); SvPV(_sv, lp); })
1652 # define SvPVx_const(sv, lp) ({SV *_sv = (sv); SvPV_const(_sv, lp); })
1653 # define SvPVx_nolen(sv) ({SV *_sv = (sv); SvPV_nolen(_sv); })
1654 # define SvPVx_nolen_const(sv) ({SV *_sv = (sv); SvPV_nolen_const(_sv); })
1655 # define SvPVutf8x(sv, lp) ({SV *_sv = (sv); SvPVutf8(_sv, lp); })
1656 # define SvPVbytex(sv, lp) ({SV *_sv = (sv); SvPVbyte(_sv, lp); })
1657 # define SvPVbytex_nolen(sv) ({SV *_sv = (sv); SvPVbyte_nolen(_sv); })
1658 # define SvTRUE(sv) ( \
1662 ? (({XPV *nxpv = (XPV*)SvANY(sv); \
1664 (nxpv->xpv_cur > 1 || \
1665 (nxpv->xpv_cur && *(sv)->sv_u.svu_pv != '0')); }) \
1672 ? SvNVX(sv) != 0.0 \
1674 # define SvTRUE_nomg(sv) ( \
1678 ? (({XPV *nxpv = (XPV*)SvANY(sv); \
1680 (nxpv->xpv_cur > 1 || \
1681 (nxpv->xpv_cur && *(sv)->sv_u.svu_pv != '0')); }) \
1688 ? SvNVX(sv) != 0.0 \
1689 : sv_2bool_flags(sv,0) )
1690 # define SvTRUEx(sv) ({SV *_sv = (sv); SvTRUE(_sv); })
1692 #else /* __GNUC__ */
1694 /* These inlined macros use globals, which will require a thread
1695 * declaration in user code, so we avoid them under threads */
1697 # define SvIVx(sv) ((PL_Sv = (sv)), SvIV(PL_Sv))
1698 # define SvUVx(sv) ((PL_Sv = (sv)), SvUV(PL_Sv))
1699 # define SvNVx(sv) ((PL_Sv = (sv)), SvNV(PL_Sv))
1700 # define SvPVx(sv, lp) ((PL_Sv = (sv)), SvPV(PL_Sv, lp))
1701 # define SvPVx_const(sv, lp) ((PL_Sv = (sv)), SvPV_const(PL_Sv, lp))
1702 # define SvPVx_nolen(sv) ((PL_Sv = (sv)), SvPV_nolen(PL_Sv))
1703 # define SvPVx_nolen_const(sv) ((PL_Sv = (sv)), SvPV_nolen_const(PL_Sv))
1704 # define SvPVutf8x(sv, lp) ((PL_Sv = (sv)), SvPVutf8(PL_Sv, lp))
1705 # define SvPVbytex(sv, lp) ((PL_Sv = (sv)), SvPVbyte(PL_Sv, lp))
1706 # define SvPVbytex_nolen(sv) ((PL_Sv = (sv)), SvPVbyte_nolen(PL_Sv))
1707 # define SvTRUE(sv) ( \
1711 ? ((PL_Xpv = (XPV*)SvANY(PL_Sv = (sv))) && \
1712 (PL_Xpv->xpv_cur > 1 || \
1713 (PL_Xpv->xpv_cur && *PL_Sv->sv_u.svu_pv != '0')) \
1720 ? SvNVX(sv) != 0.0 \
1722 # define SvTRUE_nomg(sv) ( \
1726 ? ((PL_Xpv = (XPV*)SvANY(PL_Sv = (sv))) && \
1727 (PL_Xpv->xpv_cur > 1 || \
1728 (PL_Xpv->xpv_cur && *PL_Sv->sv_u.svu_pv != '0')) \
1735 ? SvNVX(sv) != 0.0 \
1736 : sv_2bool_flags(sv,0) )
1737 # define SvTRUEx(sv) ((PL_Sv = (sv)), SvTRUE(PL_Sv))
1738 #endif /* __GNU__ */
1740 #define SvIsCOW(sv) ((SvFLAGS(sv) & (SVf_FAKE | SVf_READONLY)) == \
1741 (SVf_FAKE | SVf_READONLY) && !isGV_with_GP(sv))
1742 #define SvIsCOW_shared_hash(sv) (SvIsCOW(sv) && SvLEN(sv) == 0)
1744 #define SvSHARED_HEK_FROM_PV(pvx) \
1745 ((struct hek*)(pvx - STRUCT_OFFSET(struct hek, hek_key)))
1746 #define SvSHARED_HASH(sv) (0 + SvSHARED_HEK_FROM_PV(SvPVX_const(sv))->hek_hash)
1748 /* flag values for sv_*_flags functions */
1749 #define SV_IMMEDIATE_UNREF 1
1751 #define SV_COW_DROP_PV 4
1752 #define SV_UTF8_NO_ENCODING 8
1753 #define SV_NOSTEAL 16
1754 #define SV_CONST_RETURN 32
1755 #define SV_MUTABLE_RETURN 64
1756 #define SV_SMAGIC 128
1757 #define SV_HAS_TRAILING_NUL 256
1758 #define SV_COW_SHARED_HASH_KEYS 512
1759 /* This one is only enabled for PERL_OLD_COPY_ON_WRITE */
1760 #define SV_COW_OTHER_PVS 1024
1761 /* Make sv_2pv_flags return NULL if something is undefined. */
1762 #define SV_UNDEF_RETURNS_NULL 2048
1763 /* Tell sv_utf8_upgrade() to not check to see if an upgrade is really needed.
1764 * This is used when the caller has already determined it is, and avoids
1766 #define SV_FORCE_UTF8_UPGRADE 4096
1767 /* if (after resolving magic etc), the SV is found to be overloaded,
1768 * don't call the overload magic, just return as-is */
1769 #define SV_SKIP_OVERLOAD 8192
1770 /* It is not yet clear whether we want this as an API, or what the
1771 * constants should be named. */
1773 # define SV_CATBYTES 16384
1774 # define SV_CATUTF8 32768
1777 /* The core is safe for this COW optimisation. XS code on CPAN may not be.
1778 So only default to doing the COW setup if we're in the core.
1781 # ifndef SV_DO_COW_SVSETSV
1782 # define SV_DO_COW_SVSETSV SV_COW_SHARED_HASH_KEYS|SV_COW_OTHER_PVS
1786 #ifndef SV_DO_COW_SVSETSV
1787 # define SV_DO_COW_SVSETSV 0
1791 #define sv_unref(sv) sv_unref_flags(sv, 0)
1792 #define sv_force_normal(sv) sv_force_normal_flags(sv, 0)
1793 #define sv_usepvn(sv, p, l) sv_usepvn_flags(sv, p, l, 0)
1794 #define sv_usepvn_mg(sv, p, l) sv_usepvn_flags(sv, p, l, SV_SMAGIC)
1796 /* We are about to replace the SV's current value. So if it's copy on write
1797 we need to normalise it. Use the SV_COW_DROP_PV flag hint to say that
1798 the value is about to get thrown away, so drop the PV rather than go to
1799 the effort of making a read-write copy only for it to get immediately
1802 #define SV_CHECK_THINKFIRST_COW_DROP(sv) if (SvTHINKFIRST(sv)) \
1803 sv_force_normal_flags(sv, SV_COW_DROP_PV)
1805 #ifdef PERL_OLD_COPY_ON_WRITE
1806 #define SvRELEASE_IVX(sv) \
1807 ((SvIsCOW(sv) ? sv_force_normal_flags(sv, 0) : (void) 0), 0)
1808 # define SvIsCOW_normal(sv) (SvIsCOW(sv) && SvLEN(sv))
1809 # define SvRELEASE_IVX_(sv) SvRELEASE_IVX(sv),
1811 # define SvRELEASE_IVX(sv) 0
1812 /* This little game brought to you by the need to shut this warning up:
1813 mg.c: In function `Perl_magic_get':
1814 mg.c:1024: warning: left-hand operand of comma expression has no effect
1816 # define SvRELEASE_IVX_(sv) /**/
1817 #endif /* PERL_OLD_COPY_ON_WRITE */
1819 #define CAN_COW_MASK (SVs_OBJECT|SVs_GMG|SVs_SMG|SVs_RMG|SVf_IOK|SVf_NOK| \
1820 SVf_POK|SVf_ROK|SVp_IOK|SVp_NOK|SVp_POK|SVf_FAKE| \
1821 SVf_OOK|SVf_BREAK|SVf_READONLY)
1822 #define CAN_COW_FLAGS (SVp_POK|SVf_POK)
1824 #define SV_CHECK_THINKFIRST(sv) if (SvTHINKFIRST(sv)) \
1825 sv_force_normal_flags(sv, 0)
1828 /* all these 'functions' are now just macros */
1830 #define sv_pv(sv) SvPV_nolen(sv)
1831 #define sv_pvutf8(sv) SvPVutf8_nolen(sv)
1832 #define sv_pvbyte(sv) SvPVbyte_nolen(sv)
1834 #define sv_pvn_force_nomg(sv, lp) sv_pvn_force_flags(sv, lp, 0)
1835 #define sv_utf8_upgrade_flags(sv, flags) sv_utf8_upgrade_flags_grow(sv, flags, 0)
1836 #define sv_utf8_upgrade_nomg(sv) sv_utf8_upgrade_flags(sv, 0)
1837 #define sv_catpvn_nomg(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, 0)
1838 #define sv_catpv_nomg(dsv, sstr) sv_catpv_flags(dsv, sstr, 0)
1839 #define sv_setsv(dsv, ssv) \
1840 sv_setsv_flags(dsv, ssv, SV_GMAGIC|SV_DO_COW_SVSETSV)
1841 #define sv_setsv_nomg(dsv, ssv) sv_setsv_flags(dsv, ssv, SV_DO_COW_SVSETSV)
1842 #define sv_catsv(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC)
1843 #define sv_catsv_nomg(dsv, ssv) sv_catsv_flags(dsv, ssv, 0)
1844 #define sv_catsv_mg(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC|SV_SMAGIC)
1845 #define sv_catpvn(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, SV_GMAGIC)
1846 #define sv_catpvn_mg(sv, sstr, slen) \
1847 sv_catpvn_flags(sv, sstr, slen, SV_GMAGIC|SV_SMAGIC);
1848 #define sv_2pv(sv, lp) sv_2pv_flags(sv, lp, SV_GMAGIC)
1849 #define sv_2pv_nolen(sv) sv_2pv(sv, 0)
1850 #define sv_2pvbyte_nolen(sv) sv_2pvbyte(sv, 0)
1851 #define sv_2pvutf8_nolen(sv) sv_2pvutf8(sv, 0)
1852 #define sv_2pv_nomg(sv, lp) sv_2pv_flags(sv, lp, 0)
1853 #define sv_pvn_force(sv, lp) sv_pvn_force_flags(sv, lp, SV_GMAGIC)
1854 #define sv_utf8_upgrade(sv) sv_utf8_upgrade_flags(sv, SV_GMAGIC)
1855 #define sv_2iv(sv) sv_2iv_flags(sv, SV_GMAGIC)
1856 #define sv_2uv(sv) sv_2uv_flags(sv, SV_GMAGIC)
1857 #define sv_2nv(sv) sv_2nv_flags(sv, SV_GMAGIC)
1858 #define sv_eq(sv1, sv2) sv_eq_flags(sv1, sv2, SV_GMAGIC)
1859 #define sv_cmp(sv1, sv2) sv_cmp_flags(sv1, sv2, SV_GMAGIC)
1860 #define sv_cmp_locale(sv1, sv2) sv_cmp_locale_flags(sv1, sv2, SV_GMAGIC)
1861 #define sv_collxfrm(sv, nxp) sv_cmp_flags(sv, nxp, SV_GMAGIC)
1862 #define sv_2bool(sv) sv_2bool_flags(sv, SV_GMAGIC)
1863 #define sv_insert(bigstr, offset, len, little, littlelen) \
1864 Perl_sv_insert_flags(aTHX_ (bigstr),(offset), (len), (little), \
1865 (littlelen), SV_GMAGIC)
1867 /* Should be named SvCatPVN_utf8_upgrade? */
1868 #define sv_catpvn_utf8_upgrade(dsv, sstr, slen, nsv) \
1871 nsv = newSVpvn_flags(sstr, slen, SVs_TEMP); \
1873 sv_setpvn(nsv, sstr, slen); \
1875 sv_utf8_upgrade(nsv); \
1876 sv_catsv(dsv, nsv); \
1880 =for apidoc Am|SV*|newRV_inc|SV* sv
1882 Creates an RV wrapper for an SV. The reference count for the original SV is
1888 #define newRV_inc(sv) newRV(sv)
1890 /* the following macros update any magic values this sv is associated with */
1893 =head1 Magical Functions
1895 =for apidoc Am|void|SvGETMAGIC|SV* sv
1896 Invokes C<mg_get> on an SV if it has 'get' magic. This macro evaluates its
1897 argument more than once.
1899 =for apidoc Am|void|SvSETMAGIC|SV* sv
1900 Invokes C<mg_set> on an SV if it has 'set' magic. This macro evaluates its
1901 argument more than once.
1903 =for apidoc Am|void|SvSetSV|SV* dsb|SV* ssv
1904 Calls C<sv_setsv> if dsv is not the same as ssv. May evaluate arguments
1907 =for apidoc Am|void|SvSetSV_nosteal|SV* dsv|SV* ssv
1908 Calls a non-destructive version of C<sv_setsv> if dsv is not the same as
1909 ssv. May evaluate arguments more than once.
1911 =for apidoc Am|void|SvSetMagicSV|SV* dsb|SV* ssv
1912 Like C<SvSetSV>, but does any set magic required afterwards.
1914 =for apidoc Am|void|SvSetMagicSV_nosteal|SV* dsv|SV* ssv
1915 Like C<SvSetSV_nosteal>, but does any set magic required afterwards.
1917 =for apidoc Am|void|SvSHARE|SV* sv
1918 Arranges for sv to be shared between threads if a suitable module
1921 =for apidoc Am|void|SvLOCK|SV* sv
1922 Arranges for a mutual exclusion lock to be obtained on sv if a suitable module
1925 =for apidoc Am|void|SvUNLOCK|SV* sv
1926 Releases a mutual exclusion lock on sv if a suitable module
1929 =head1 SV Manipulation Functions
1931 =for apidoc Am|char *|SvGROW|SV* sv|STRLEN len
1932 Expands the character buffer in the SV so that it has room for the
1933 indicated number of bytes (remember to reserve space for an extra trailing
1934 NUL character). Calls C<sv_grow> to perform the expansion if necessary.
1935 Returns a pointer to the character buffer.
1940 #define SvSHARE(sv) PL_sharehook(aTHX_ sv)
1941 #define SvLOCK(sv) PL_lockhook(aTHX_ sv)
1942 #define SvUNLOCK(sv) PL_unlockhook(aTHX_ sv)
1943 #define SvDESTROYABLE(sv) PL_destroyhook(aTHX_ sv)
1945 #define SvGETMAGIC(x) ((void)(SvGMAGICAL(x) && mg_get(x)))
1946 #define SvSETMAGIC(x) STMT_START { if (SvSMAGICAL(x)) mg_set(x); } STMT_END
1948 #define SvSetSV_and(dst,src,finally) \
1950 if ((dst) != (src)) { \
1951 sv_setsv(dst, src); \
1955 #define SvSetSV_nosteal_and(dst,src,finally) \
1957 if ((dst) != (src)) { \
1958 sv_setsv_flags(dst, src, SV_GMAGIC | SV_NOSTEAL | SV_DO_COW_SVSETSV); \
1963 #define SvSetSV(dst,src) \
1964 SvSetSV_and(dst,src,/*nothing*/;)
1965 #define SvSetSV_nosteal(dst,src) \
1966 SvSetSV_nosteal_and(dst,src,/*nothing*/;)
1968 #define SvSetMagicSV(dst,src) \
1969 SvSetSV_and(dst,src,SvSETMAGIC(dst))
1970 #define SvSetMagicSV_nosteal(dst,src) \
1971 SvSetSV_nosteal_and(dst,src,SvSETMAGIC(dst))
1974 #if !defined(SKIP_DEBUGGING)
1975 #define SvPEEK(sv) sv_peek(sv)
1977 #define SvPEEK(sv) ""
1980 #define SvIMMORTAL(sv) ((sv)==&PL_sv_undef || (sv)==&PL_sv_yes || (sv)==&PL_sv_no || (sv)==&PL_sv_placeholder)
1983 =for apidoc Am|SV *|boolSV|bool b
1985 Returns a true SV if C<b> is a true value, or a false SV if C<b> is 0.
1987 See also C<PL_sv_yes> and C<PL_sv_no>.
1992 #define boolSV(b) ((b) ? &PL_sv_yes : &PL_sv_no)
1994 #define isGV(sv) (SvTYPE(sv) == SVt_PVGV)
1995 /* If I give every macro argument a different name, then there won't be bugs
1996 where nested macros get confused. Been there, done that. */
1997 #define isGV_with_GP(pwadak) \
1998 (((SvFLAGS(pwadak) & (SVp_POK|SVpgv_GP)) == SVpgv_GP) \
1999 && (SvTYPE(pwadak) == SVt_PVGV || SvTYPE(pwadak) == SVt_PVLV))
2000 #define isGV_with_GP_on(sv) STMT_START { \
2001 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
2002 assert (!SvPOKp(sv)); \
2003 assert (!SvIOKp(sv)); \
2004 (SvFLAGS(sv) |= SVpgv_GP); \
2006 #define isGV_with_GP_off(sv) STMT_START { \
2007 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
2008 assert (!SvPOKp(sv)); \
2009 assert (!SvIOKp(sv)); \
2010 (SvFLAGS(sv) &= ~SVpgv_GP); \
2014 #define SvGROW(sv,len) (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
2015 #define SvGROW_mutable(sv,len) \
2016 (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX_mutable(sv))
2017 #define Sv_Grow sv_grow
2019 #define CLONEf_COPY_STACKS 1
2020 #define CLONEf_KEEP_PTR_TABLE 2
2021 #define CLONEf_CLONE_HOST 4
2022 #define CLONEf_JOIN_IN 8
2024 struct clone_params {
2027 PerlInterpreter *proto_perl;
2028 PerlInterpreter *new_perl;
2033 =for apidoc Am|SV*|newSVpvn_utf8|NULLOK const char* s|STRLEN len|U32 utf8
2035 Creates a new SV and copies a string into it. If utf8 is true, calls
2036 C<SvUTF8_on> on the new SV. Implemented as a wrapper around C<newSVpvn_flags>.
2041 #define newSVpvn_utf8(s, len, u) newSVpvn_flags((s), (len), (u) ? SVf_UTF8 : 0)
2044 =for apidoc Am|void|SvOOK_offset|NN SV*sv|STRLEN len
2046 Reads into I<len> the offset from SvPVX back to the true start of the
2047 allocated buffer, which will be non-zero if C<sv_chop> has been used to
2048 efficiently remove characters from start of the buffer. Implemented as a
2049 macro, which takes the address of I<len>, which must be of type C<STRLEN>.
2050 Evaluates I<sv> more than once. Sets I<len> to 0 if C<SvOOK(sv)> is false.
2056 /* Does the bot know something I don't?
2057 10:28 <@Nicholas> metabatman
2058 10:28 <+meta> Nicholas: crash
2060 # define SvOOK_offset(sv, offset) STMT_START { \
2061 assert(sizeof(offset) == sizeof(STRLEN)); \
2063 const U8 *crash = (U8*)SvPVX_const(sv); \
2064 offset = *--crash; \
2066 crash -= sizeof(STRLEN); \
2067 Copy(crash, (U8 *)&offset, sizeof(STRLEN), U8); \
2070 /* Validate the preceding buffer's sentinels to \
2071 verify that no-one is using it. */ \
2072 const U8 *const bonk = (U8 *) SvPVX_const(sv) - offset; \
2073 while (crash > bonk) { \
2075 assert (*crash == (U8)PTR2UV(crash)); \
2083 /* This is the same code, but avoids using any temporary variables: */
2084 # define SvOOK_offset(sv, offset) STMT_START { \
2085 assert(sizeof(offset) == sizeof(STRLEN)); \
2087 offset = ((U8*)SvPVX_const(sv))[-1]; \
2089 Copy(SvPVX_const(sv) - 1 - sizeof(STRLEN), \
2090 (U8 *)&offset, sizeof(STRLEN), U8); \
2098 #define newIO() MUTABLE_IO(newSV_type(SVt_PVIO))
2102 * c-indentation-style: bsd
2104 * indent-tabs-mode: t
2107 * ex: set ts=8 sts=4 sw=4 noet: