3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 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 */
69 /* Although Fast Boyer Moore tables are now being stored in PVGVs, for most
70 purposes eternal code wanting to consider PVBM probably needs to think of
72 # define SVt_PVBM SVt_PVMG
73 /* Anything wanting to create a reference from clean should ensure that it has
74 a scalar of type SVt_IV now: */
75 # define SVt_RV SVt_IV
78 /* There is collusion here with sv_clear - sv_clear exits early for SVt_NULL
79 and SVt_IV, so never reaches the clause at the end that uses
80 sv_type_details->body_size to determine whether to call safefree(). Hence
81 body_size can be set no-zero to record the size of PTEs and HEs, without
82 fear of bogus frees. */
84 #define PTE_SVSLOT SVt_IV
86 #if defined(PERL_IN_HV_C) || defined(PERL_IN_XS_APITEST)
87 #define HE_SVSLOT SVt_NULL
90 #define PERL_ARENA_ROOTS_SIZE (SVt_LAST)
92 /* typedefs to eliminate some typing */
94 typedef struct hek HEK;
96 /* Using C's structural equivalence to help emulate C++ inheritance here... */
98 /* start with 2 sv-head building blocks */
99 #define _SV_HEAD(ptrtype) \
100 ptrtype sv_any; /* pointer to body */ \
101 U32 sv_refcnt; /* how many references to us */ \
102 U32 sv_flags /* what we are */
104 #define _SV_HEAD_UNION \
108 SV* svu_rv; /* pointer to another SV */ \
109 char* svu_pv; /* pointer to malloced string */ \
116 struct STRUCT_SV { /* struct sv { */
119 #ifdef DEBUG_LEAKING_SCALARS
120 unsigned sv_debug_optype:9; /* the type of OP that allocated us */
121 unsigned sv_debug_inpad:1; /* was allocated in a pad for an OP */
122 unsigned sv_debug_cloned:1; /* was cloned for an ithread */
123 unsigned sv_debug_line:16; /* the line where we were allocated */
124 char * sv_debug_file; /* the file where we were allocated */
129 _SV_HEAD(XPVGV*); /* pointer to xpvgv body */
134 _SV_HEAD(XPVCV*); /* pointer to xpvcv body */
139 _SV_HEAD(XPVAV*); /* pointer to xpvav body */
144 _SV_HEAD(XPVHV*); /* pointer to xpvhv body */
149 _SV_HEAD(XPVIO*); /* pointer to xpvio body */
154 #undef _SV_HEAD_UNION /* ensure no pollution */
157 =head1 SV Manipulation Functions
159 =for apidoc Am|U32|SvREFCNT|SV* sv
160 Returns the value of the object's reference count.
162 =for apidoc Am|SV*|SvREFCNT_inc|SV* sv
163 Increments the reference count of the given SV.
165 All of the following SvREFCNT_inc* macros are optimized versions of
166 SvREFCNT_inc, and can be replaced with SvREFCNT_inc.
168 =for apidoc Am|SV*|SvREFCNT_inc_NN|SV* sv
169 Same as SvREFCNT_inc, but can only be used if you know I<sv>
170 is not NULL. Since we don't have to check the NULLness, it's faster
173 =for apidoc Am|void|SvREFCNT_inc_void|SV* sv
174 Same as SvREFCNT_inc, but can only be used if you don't need the
175 return value. The macro doesn't need to return a meaningful value.
177 =for apidoc Am|void|SvREFCNT_inc_void_NN|SV* sv
178 Same as SvREFCNT_inc, but can only be used if you don't need the return
179 value, and you know that I<sv> is not NULL. The macro doesn't need
180 to return a meaningful value, or check for NULLness, so it's smaller
183 =for apidoc Am|SV*|SvREFCNT_inc_simple|SV* sv
184 Same as SvREFCNT_inc, but can only be used with expressions without side
185 effects. Since we don't have to store a temporary value, it's faster.
187 =for apidoc Am|SV*|SvREFCNT_inc_simple_NN|SV* sv
188 Same as SvREFCNT_inc_simple, but can only be used if you know I<sv>
189 is not NULL. Since we don't have to check the NULLness, it's faster
192 =for apidoc Am|void|SvREFCNT_inc_simple_void|SV* sv
193 Same as SvREFCNT_inc_simple, but can only be used if you don't need the
194 return value. The macro doesn't need to return a meaningful value.
196 =for apidoc Am|void|SvREFCNT_inc_simple_void_NN|SV* sv
197 Same as SvREFCNT_inc, but can only be used if you don't need the return
198 value, and you know that I<sv> is not NULL. The macro doesn't need
199 to return a meaningful value, or check for NULLness, so it's smaller
202 =for apidoc Am|void|SvREFCNT_dec|SV* sv
203 Decrements the reference count of the given SV.
205 =for apidoc Am|svtype|SvTYPE|SV* sv
206 Returns the type of the SV. See C<svtype>.
208 =for apidoc Am|void|SvUPGRADE|SV* sv|svtype type
209 Used to upgrade an SV to a more complex form. Uses C<sv_upgrade> to
210 perform the upgrade if necessary. See C<svtype>.
215 #define SvANY(sv) (sv)->sv_any
216 #define SvFLAGS(sv) (sv)->sv_flags
217 #define SvREFCNT(sv) (sv)->sv_refcnt
219 #if defined(__GNUC__) && !defined(__STRICT_ANSI__) && !defined(PERL_GCC_PEDANTIC)
220 # define SvREFCNT_inc(sv) \
222 SV * const _sv = (SV*)(sv); \
227 # define SvREFCNT_inc_simple(sv) \
233 # define SvREFCNT_inc_NN(sv) \
235 SV * const _sv = (SV*)(sv); \
239 # define SvREFCNT_inc_void(sv) \
241 SV * const _sv = (SV*)(sv); \
243 (void)(SvREFCNT(_sv)++); \
246 # define SvREFCNT_inc(sv) \
247 ((PL_Sv=(SV*)(sv)) ? (++(SvREFCNT(PL_Sv)),PL_Sv) : NULL)
248 # define SvREFCNT_inc_simple(sv) \
249 ((sv) ? (SvREFCNT(sv)++,(SV*)(sv)) : NULL)
250 # define SvREFCNT_inc_NN(sv) \
251 (PL_Sv=(SV*)(sv),++(SvREFCNT(PL_Sv)),PL_Sv)
252 # define SvREFCNT_inc_void(sv) \
253 (void)((PL_Sv=(SV*)(sv)) ? ++(SvREFCNT(PL_Sv)) : 0)
256 /* These guys don't need the curly blocks */
257 #define SvREFCNT_inc_simple_void(sv) STMT_START { if (sv) SvREFCNT(sv)++; } STMT_END
258 #define SvREFCNT_inc_simple_NN(sv) (++(SvREFCNT(sv)),(SV*)(sv))
259 #define SvREFCNT_inc_void_NN(sv) (void)(++SvREFCNT((SV*)(sv)))
260 #define SvREFCNT_inc_simple_void_NN(sv) (void)(++SvREFCNT((SV*)(sv)))
262 #if defined(__GNUC__) && !defined(__STRICT_ANSI__) && !defined(PERL_GCC_PEDANTIC)
263 # define SvREFCNT_dec(sv) \
265 SV * const _sv = (SV*)(sv); \
267 if (SvREFCNT(_sv)) { \
268 if (--(SvREFCNT(_sv)) == 0) \
269 Perl_sv_free2(aTHX_ _sv); \
276 #define SvREFCNT_dec(sv) sv_free((SV*)(sv))
279 #define SVTYPEMASK 0xff
280 #define SvTYPE(sv) ((svtype)((sv)->sv_flags & SVTYPEMASK))
282 /* Sadly there are some parts of the core that have pointers to already-freed
283 SV heads, and rely on being able to tell that they are now free. So mark
284 them all by using a consistent macro. */
285 #define SvIS_FREED(sv) ((sv)->sv_flags == SVTYPEMASK)
287 #define SvUPGRADE(sv, mt) (SvTYPE(sv) >= (mt) || (sv_upgrade(sv, mt), 1))
289 #define SVf_IOK 0x00000100 /* has valid public integer value */
290 #define SVf_NOK 0x00000200 /* has valid public numeric value */
291 #define SVf_POK 0x00000400 /* has valid public pointer value */
292 #define SVf_ROK 0x00000800 /* has a valid reference pointer */
294 #define SVp_IOK 0x00001000 /* has valid non-public integer value */
295 #define SVp_NOK 0x00002000 /* has valid non-public numeric value */
296 #define SVp_POK 0x00004000 /* has valid non-public pointer value */
297 #define SVp_SCREAM 0x00008000 /* has been studied? */
298 #define SVphv_CLONEABLE SVp_SCREAM /* PVHV (stashes) clone its objects */
299 #define SVpgv_GP SVp_SCREAM /* GV has a valid GP */
300 #define SVprv_PCS_IMPORTED SVp_SCREAM /* RV is a proxy for a constant
301 subroutine in another package. Set the
302 CvIMPORTED_CV_ON() if it needs to be
303 expanded to a real GV */
305 #define SVs_PADSTALE 0x00010000 /* lexical has gone out of scope */
306 #define SVpad_STATE 0x00010000 /* pad name is a "state" var */
307 #define SVs_PADTMP 0x00020000 /* in use as tmp */
308 #define SVpad_TYPED 0x00020000 /* pad name is a Typed Lexical */
309 #define SVs_PADMY 0x00040000 /* in use a "my" variable */
310 #define SVpad_OUR 0x00040000 /* pad name is "our" instead of "my" */
311 #define SVs_TEMP 0x00080000 /* string is stealable? */
312 #define SVs_OBJECT 0x00100000 /* is "blessed" */
313 #define SVs_GMG 0x00200000 /* has magical get method */
314 #define SVs_SMG 0x00400000 /* has magical set method */
315 #define SVs_RMG 0x00800000 /* has random magical methods */
317 #define SVf_FAKE 0x01000000 /* 0: glob or lexical is just a copy
318 1: SV head arena wasn't malloc()ed
319 2: in conjunction with SVf_READONLY
320 marks a shared hash key scalar
321 (SvLEN == 0) or a copy on write
322 string (SvLEN != 0) [SvIsCOW(sv)]
323 3: For PVCV, whether CvUNIQUE(cv)
324 refers to an eval or once only
325 [CvEVAL(cv), CvSPECIAL(cv)]
326 4: Whether the regexp pointer is in
327 fact an offset [SvREPADTMP(sv)]
328 5: On a pad name SV, that slot in the
329 frame AV is a REFCNT'ed reference
330 to a lexical from "outside". */
331 #define SVphv_REHASH SVf_FAKE /* 6: On a PVHV, hash values are being
333 #define SVf_OOK 0x02000000 /* has valid offset value. For a PVHV this
334 means that a hv_aux struct is present
335 after the main array */
336 #define SVf_BREAK 0x04000000 /* refcnt is artificially low - used by
337 SV's in final arena cleanup */
338 #define SVf_READONLY 0x08000000 /* may not be modified */
343 #define SVf_THINKFIRST (SVf_READONLY|SVf_ROK|SVf_FAKE)
345 #define SVf_OK (SVf_IOK|SVf_NOK|SVf_POK|SVf_ROK| \
346 SVp_IOK|SVp_NOK|SVp_POK|SVpgv_GP)
348 #define PRIVSHIFT 4 /* (SVp_?OK >> PRIVSHIFT) == SVf_?OK */
350 #define SVf_AMAGIC 0x10000000 /* has magical overloaded methods */
352 /* Ensure this value does not clash with the GV_ADD* flags in gv.h: */
353 #define SVf_UTF8 0x20000000 /* SvPV is UTF-8 encoded
354 This is also set on RVs whose overloaded
355 stringification is UTF-8. This might
356 only happen as a side effect of SvPV() */
359 /* Some private flags. */
361 /* PVAV could probably use 0x2000000 without conflict. I assume that PVFM can
362 be UTF-8 encoded, and PVCVs could well have UTF-8 prototypes. PVIOs haven't
363 been restructured, so sometimes get used as string buffers. */
366 #define SVphv_SHAREKEYS 0x20000000 /* PVHV keys live on shared string table */
367 /* PVNV, PVMG, presumably only inside pads */
368 #define SVpad_NAME 0x40000000 /* This SV is a name in the PAD, so
369 SVpad_TYPED, SVpad_OUR and SVpad_STATE
372 #define SVpav_REAL 0x40000000 /* free old entries */
374 #define SVphv_LAZYDEL 0x40000000 /* entry in xhv_eiter must be deleted */
375 /* This is only set true on a PVGV when it's playing "PVBM", but is tested for
376 on any regular scalar (anything <= PVLV) */
377 #define SVpbm_VALID 0x40000000
379 #define SVrepl_EVAL 0x40000000 /* Replacement part of s///e */
381 /* IV, PVIV, PVNV, PVMG, PVGV and (I assume) PVLV */
382 /* Presumably IVs aren't stored in pads */
383 #define SVf_IVisUV 0x80000000 /* use XPVUV instead of XPVIV */
385 #define SVpav_REIFY 0x80000000 /* can become real */
387 #define SVphv_HASKFLAGS 0x80000000 /* keys have flag byte after hash */
389 #define SVpfm_COMPILED 0x80000000 /* FORMLINE is compiled */
390 /* PVGV when SVpbm_VALID is true */
391 #define SVpbm_TAIL 0x80000000
392 /* RV upwards. However, SVf_ROK and SVp_IOK are exclusive */
393 #define SVprv_WEAKREF 0x80000000 /* Weak reference */
395 #define _XPV_ALLOCATED_HEAD \
396 STRLEN xpv_cur; /* length of svu_pv as a C string */ \
397 STRLEN xpv_len /* allocated size */
404 NV xnv_nv; /* numeric value, if any */
409 } xpad_cop_seq; /* used by pad.c for cop_sequence */
411 U32 xbm_previous; /* how many characters in string before rare? */
413 U8 xbm_rare; /* rarest character in string */
414 } xbm_s; /* fields from PVBM */
418 IV xivu_iv; /* integer value */
419 /* xpvfm: pv offset */
423 HEK * xivu_namehek; /* xpvlv, xpvgv: GvNAME */
427 MAGIC* xmg_magic; /* linked list of magicalness */
428 HV* xmg_ourstash; /* Stash for our (when SvPAD_OUR is true) */
449 #define xiv_iv xiv_u.xivu_iv
456 #define xuv_uv xuv_u.xivu_uv
463 #define _XPVMG_HEAD \
466 HV* xmg_stash /* class package */
468 /* These structure must match the beginning of struct xpvhv in hv.h. */
481 char xlv_type; /* k=keys .=pos x=substr v=vec /=join/re
482 * y=alem/helem/iter t=tie T=tied HE */
485 /* This structure works in 3 ways - regular scalar, GV with GP, or fast
492 /* This structure must match XPVCV in cv.h */
494 typedef U16 cv_flags_t;
496 #define _XPVCV_COMMON \
504 void (*xcv_xsub) (pTHX_ CV*); \
510 U32 xcv_outside_seq; /* the COP sequence (at the point of our \
511 * compilation) in the lexically enclosing \
533 PerlIO * xio_ifp; /* ifp and ofp are normally the same */
534 PerlIO * xio_ofp; /* but sockets need separate streams */
535 /* Cray addresses everything by word boundaries (64 bits) and
536 * code and data pointers cannot be mixed (which is exactly what
537 * Perl_filter_add() tries to do with the dirp), hence the following
538 * union trick (as suggested by Gurusamy Sarathy).
539 * For further information see Geir Johansen's problem report titled
540 [ID 20000612.002] Perl problem on Cray system
541 * The any pointer (known as IoANY()) will also be a good place
542 * to hang any IO disciplines to.
545 DIR * xiou_dirp; /* for opendir, readdir, etc */
546 void * xiou_any; /* for alignment */
548 IV xio_lines; /* $. */
549 IV xio_page; /* $% */
550 IV xio_page_len; /* $= */
551 IV xio_lines_left; /* $- */
552 char * xio_top_name; /* $^ */
553 GV * xio_top_gv; /* $^ */
554 char * xio_fmt_name; /* $~ */
555 GV * xio_fmt_gv; /* $~ */
556 char * xio_bottom_name;/* $^B */
557 GV * xio_bottom_gv; /* $^B */
561 #define xio_dirp xio_dirpu.xiou_dirp
562 #define xio_any xio_dirpu.xiou_any
564 #define IOf_ARGV 1 /* this fp iterates over ARGV */
565 #define IOf_START 2 /* check for null ARGV and substitute '-' */
566 #define IOf_FLUSH 4 /* this fp wants a flush after write op */
567 #define IOf_DIDTOP 8 /* just did top of form */
568 #define IOf_UNTAINT 16 /* consider this fp (and its data) "safe" */
569 #define IOf_NOLINE 32 /* slurped a pseudo-line from empty file */
570 #define IOf_FAKE_DIRP 64 /* xio_dirp is fake (source filters kludge) */
572 /* The following macros define implementation-independent predicates on SVs. */
575 =for apidoc Am|U32|SvNIOK|SV* sv
576 Returns a U32 value indicating whether the SV contains a number, integer or
579 =for apidoc Am|U32|SvNIOKp|SV* sv
580 Returns a U32 value indicating whether the SV contains a number, integer or
581 double. Checks the B<private> setting. Use C<SvNIOK>.
583 =for apidoc Am|void|SvNIOK_off|SV* sv
584 Unsets the NV/IV status of an SV.
586 =for apidoc Am|U32|SvOK|SV* sv
587 Returns a U32 value indicating whether the value is an SV. It also tells
588 whether the value is defined or not.
590 =for apidoc Am|U32|SvIOKp|SV* sv
591 Returns a U32 value indicating whether the SV contains an integer. Checks
592 the B<private> setting. Use C<SvIOK>.
594 =for apidoc Am|U32|SvNOKp|SV* sv
595 Returns a U32 value indicating whether the SV contains a double. Checks the
596 B<private> setting. Use C<SvNOK>.
598 =for apidoc Am|U32|SvPOKp|SV* sv
599 Returns a U32 value indicating whether the SV contains a character string.
600 Checks the B<private> setting. Use C<SvPOK>.
602 =for apidoc Am|U32|SvIOK|SV* sv
603 Returns a U32 value indicating whether the SV contains an integer.
605 =for apidoc Am|void|SvIOK_on|SV* sv
606 Tells an SV that it is an integer.
608 =for apidoc Am|void|SvIOK_off|SV* sv
609 Unsets the IV status of an SV.
611 =for apidoc Am|void|SvIOK_only|SV* sv
612 Tells an SV that it is an integer and disables all other OK bits.
614 =for apidoc Am|void|SvIOK_only_UV|SV* sv
615 Tells and SV that it is an unsigned integer and disables all other OK bits.
617 =for apidoc Am|bool|SvIOK_UV|SV* sv
618 Returns a boolean indicating whether the SV contains an unsigned integer.
620 =for apidoc Am|bool|SvUOK|SV* sv
621 Returns a boolean indicating whether the SV contains an unsigned integer.
623 =for apidoc Am|bool|SvIOK_notUV|SV* sv
624 Returns a boolean indicating whether the SV contains a signed integer.
626 =for apidoc Am|U32|SvNOK|SV* sv
627 Returns a U32 value indicating whether the SV contains a double.
629 =for apidoc Am|void|SvNOK_on|SV* sv
630 Tells an SV that it is a double.
632 =for apidoc Am|void|SvNOK_off|SV* sv
633 Unsets the NV status of an SV.
635 =for apidoc Am|void|SvNOK_only|SV* sv
636 Tells an SV that it is a double and disables all other OK bits.
638 =for apidoc Am|U32|SvPOK|SV* sv
639 Returns a U32 value indicating whether the SV contains a character
642 =for apidoc Am|void|SvPOK_on|SV* sv
643 Tells an SV that it is a string.
645 =for apidoc Am|void|SvPOK_off|SV* sv
646 Unsets the PV status of an SV.
648 =for apidoc Am|void|SvPOK_only|SV* sv
649 Tells an SV that it is a string and disables all other OK bits.
650 Will also turn off the UTF-8 status.
652 =for apidoc Am|bool|SvVOK|SV* sv
653 Returns a boolean indicating whether the SV contains a v-string.
655 =for apidoc Am|U32|SvOOK|SV* sv
656 Returns a U32 indicating whether the SvIVX is a valid offset value for
657 the SvPVX. This hack is used internally to speed up removal of characters
658 from the beginning of a SvPV. When SvOOK is true, then the start of the
659 allocated string buffer is really (SvPVX - SvIVX).
661 =for apidoc Am|U32|SvROK|SV* sv
662 Tests if the SV is an RV.
664 =for apidoc Am|void|SvROK_on|SV* sv
665 Tells an SV that it is an RV.
667 =for apidoc Am|void|SvROK_off|SV* sv
668 Unsets the RV status of an SV.
670 =for apidoc Am|SV*|SvRV|SV* sv
671 Dereferences an RV to return the SV.
673 =for apidoc Am|IV|SvIVX|SV* sv
674 Returns the raw value in the SV's IV slot, without checks or conversions.
675 Only use when you are sure SvIOK is true. See also C<SvIV()>.
677 =for apidoc Am|UV|SvUVX|SV* sv
678 Returns the raw value in the SV's UV slot, without checks or conversions.
679 Only use when you are sure SvIOK is true. See also C<SvUV()>.
681 =for apidoc Am|NV|SvNVX|SV* sv
682 Returns the raw value in the SV's NV slot, without checks or conversions.
683 Only use when you are sure SvNOK is true. See also C<SvNV()>.
685 =for apidoc Am|char*|SvPVX|SV* sv
686 Returns a pointer to the physical string in the SV. The SV must contain a
689 =for apidoc Am|STRLEN|SvCUR|SV* sv
690 Returns the length of the string which is in the SV. See C<SvLEN>.
692 =for apidoc Am|STRLEN|SvLEN|SV* sv
693 Returns the size of the string buffer in the SV, not including any part
694 attributable to C<SvOOK>. See C<SvCUR>.
696 =for apidoc Am|char*|SvEND|SV* sv
697 Returns a pointer to the last character in the string which is in the SV.
698 See C<SvCUR>. Access the character as *(SvEND(sv)).
700 =for apidoc Am|HV*|SvSTASH|SV* sv
701 Returns the stash of the SV.
703 =for apidoc Am|void|SvIV_set|SV* sv|IV val
704 Set the value of the IV pointer in sv to val. It is possible to perform
705 the same function of this macro with an lvalue assignment to C<SvIVX>.
706 With future Perls, however, it will be more efficient to use
707 C<SvIV_set> instead of the lvalue assignment to C<SvIVX>.
709 =for apidoc Am|void|SvNV_set|SV* sv|NV val
710 Set the value of the NV pointer in sv to val. See C<SvIV_set>.
712 =for apidoc Am|void|SvPV_set|SV* sv|char* val
713 Set the value of the PV pointer in sv to val. See C<SvIV_set>.
715 =for apidoc Am|void|SvUV_set|SV* sv|UV val
716 Set the value of the UV pointer in sv to val. See C<SvIV_set>.
718 =for apidoc Am|void|SvRV_set|SV* sv|SV* val
719 Set the value of the RV pointer in sv to val. See C<SvIV_set>.
721 =for apidoc Am|void|SvMAGIC_set|SV* sv|MAGIC* val
722 Set the value of the MAGIC pointer in sv to val. See C<SvIV_set>.
724 =for apidoc Am|void|SvSTASH_set|SV* sv|HV* val
725 Set the value of the STASH pointer in sv to val. See C<SvIV_set>.
727 =for apidoc Am|void|SvCUR_set|SV* sv|STRLEN len
728 Set the current length of the string which is in the SV. See C<SvCUR>
731 =for apidoc Am|void|SvLEN_set|SV* sv|STRLEN len
732 Set the actual length of the string which is in the SV. See C<SvIV_set>.
737 #define SvNIOK(sv) (SvFLAGS(sv) & (SVf_IOK|SVf_NOK))
738 #define SvNIOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK))
739 #define SvNIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK| \
740 SVp_IOK|SVp_NOK|SVf_IVisUV))
742 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
743 #define assert_not_ROK(sv) ({assert(!SvROK(sv) || !SvRV(sv));}),
744 #define assert_not_glob(sv) ({assert(!isGV_with_GP(sv));}),
746 #define assert_not_ROK(sv)
747 #define assert_not_glob(sv)
750 #define SvOK(sv) ((SvTYPE(sv) == SVt_BIND) \
751 ? (SvFLAGS(SvRV(sv)) & SVf_OK) \
752 : (SvFLAGS(sv) & SVf_OK))
753 #define SvOK_off(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
754 SvFLAGS(sv) &= ~(SVf_OK| \
755 SVf_IVisUV|SVf_UTF8), \
757 #define SvOK_off_exc_UV(sv) (assert_not_ROK(sv) \
758 SvFLAGS(sv) &= ~(SVf_OK| \
762 #define SvOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK))
763 #define SvIOKp(sv) (SvFLAGS(sv) & SVp_IOK)
764 #define SvIOKp_on(sv) (assert_not_glob(sv) SvRELEASE_IVX_(sv) \
765 SvFLAGS(sv) |= SVp_IOK)
766 #define SvNOKp(sv) (SvFLAGS(sv) & SVp_NOK)
767 #define SvNOKp_on(sv) (assert_not_glob(sv) SvFLAGS(sv) |= SVp_NOK)
768 #define SvPOKp(sv) (SvFLAGS(sv) & SVp_POK)
769 #define SvPOKp_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
770 SvFLAGS(sv) |= SVp_POK)
772 #define SvIOK(sv) (SvFLAGS(sv) & SVf_IOK)
773 #define SvIOK_on(sv) (assert_not_glob(sv) SvRELEASE_IVX_(sv) \
774 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
775 #define SvIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVp_IOK|SVf_IVisUV))
776 #define SvIOK_only(sv) (SvOK_off(sv), \
777 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
778 #define SvIOK_only_UV(sv) (assert_not_glob(sv) SvOK_off_exc_UV(sv), \
779 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
781 #define SvIOK_UV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
782 == (SVf_IOK|SVf_IVisUV))
783 #define SvUOK(sv) SvIOK_UV(sv)
784 #define SvIOK_notUV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
787 #define SvIsUV(sv) (SvFLAGS(sv) & SVf_IVisUV)
788 #define SvIsUV_on(sv) (SvFLAGS(sv) |= SVf_IVisUV)
789 #define SvIsUV_off(sv) (SvFLAGS(sv) &= ~SVf_IVisUV)
791 #define SvNOK(sv) (SvFLAGS(sv) & SVf_NOK)
792 #define SvNOK_on(sv) (assert_not_glob(sv) \
793 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
794 #define SvNOK_off(sv) (SvFLAGS(sv) &= ~(SVf_NOK|SVp_NOK))
795 #define SvNOK_only(sv) (SvOK_off(sv), \
796 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
799 =for apidoc Am|U32|SvUTF8|SV* sv
800 Returns a U32 value indicating whether the SV contains UTF-8 encoded data.
801 Call this after SvPV() in case any call to string overloading updates the
804 =for apidoc Am|void|SvUTF8_on|SV *sv
805 Turn on the UTF-8 status of an SV (the data is not changed, just the flag).
806 Do not use frivolously.
808 =for apidoc Am|void|SvUTF8_off|SV *sv
809 Unsets the UTF-8 status of an SV.
811 =for apidoc Am|void|SvPOK_only_UTF8|SV* sv
812 Tells an SV that it is a string and disables all other OK bits,
813 and leaves the UTF-8 status as it was.
818 /* Ensure the return value of this macro does not clash with the GV_ADD* flags
820 #define SvUTF8(sv) (SvFLAGS(sv) & SVf_UTF8)
821 #define SvUTF8_on(sv) (SvFLAGS(sv) |= (SVf_UTF8))
822 #define SvUTF8_off(sv) (SvFLAGS(sv) &= ~(SVf_UTF8))
824 #define SvPOK(sv) (SvFLAGS(sv) & SVf_POK)
825 #define SvPOK_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
826 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
827 #define SvPOK_off(sv) (SvFLAGS(sv) &= ~(SVf_POK|SVp_POK))
828 #define SvPOK_only(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
829 SvFLAGS(sv) &= ~(SVf_OK| \
830 SVf_IVisUV|SVf_UTF8), \
831 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
832 #define SvPOK_only_UTF8(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
833 SvFLAGS(sv) &= ~(SVf_OK| \
835 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
837 #define SvVOK(sv) (SvMAGICAL(sv) \
838 && mg_find(sv,PERL_MAGIC_vstring))
839 /* returns the vstring magic, if any */
840 #define SvVSTRING_mg(sv) (SvMAGICAL(sv) \
841 ? mg_find(sv,PERL_MAGIC_vstring) : NULL)
843 #define SvOOK(sv) (SvFLAGS(sv) & SVf_OOK)
844 #define SvOOK_on(sv) ((void)SvIOK_off(sv), SvFLAGS(sv) |= SVf_OOK)
845 #define SvOOK_off(sv) ((void)(SvOOK(sv) && sv_backoff(sv)))
847 #define SvFAKE(sv) (SvFLAGS(sv) & SVf_FAKE)
848 #define SvFAKE_on(sv) (SvFLAGS(sv) |= SVf_FAKE)
849 #define SvFAKE_off(sv) (SvFLAGS(sv) &= ~SVf_FAKE)
851 #define SvROK(sv) (SvFLAGS(sv) & SVf_ROK)
852 #define SvROK_on(sv) (SvFLAGS(sv) |= SVf_ROK)
853 #define SvROK_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK))
855 #define SvMAGICAL(sv) (SvFLAGS(sv) & (SVs_GMG|SVs_SMG|SVs_RMG))
856 #define SvMAGICAL_on(sv) (SvFLAGS(sv) |= (SVs_GMG|SVs_SMG|SVs_RMG))
857 #define SvMAGICAL_off(sv) (SvFLAGS(sv) &= ~(SVs_GMG|SVs_SMG|SVs_RMG))
859 #define SvGMAGICAL(sv) (SvFLAGS(sv) & SVs_GMG)
860 #define SvGMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_GMG)
861 #define SvGMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_GMG)
863 #define SvSMAGICAL(sv) (SvFLAGS(sv) & SVs_SMG)
864 #define SvSMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_SMG)
865 #define SvSMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_SMG)
867 #define SvRMAGICAL(sv) (SvFLAGS(sv) & SVs_RMG)
868 #define SvRMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_RMG)
869 #define SvRMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_RMG)
871 #define SvAMAGIC(sv) (SvROK(sv) && (SvFLAGS(SvRV(sv)) & SVf_AMAGIC))
872 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
873 # define SvAMAGIC_on(sv) ({ SV * const kloink = sv; \
874 assert(SvROK(kloink)); \
875 SvFLAGS(SvRV(kloink)) |= SVf_AMAGIC; \
877 # define SvAMAGIC_off(sv) ({ SV * const kloink = sv; \
879 SvFLAGS(SvRV(kloink)) &= ~SVf_AMAGIC;\
882 # define SvAMAGIC_on(sv) (SvFLAGS(SvRV(sv)) |= SVf_AMAGIC)
883 # define SvAMAGIC_off(sv) \
884 (SvROK(sv) && (SvFLAGS(SvRV(sv)) &= ~SVf_AMAGIC))
888 =for apidoc Am|char*|SvGAMAGIC|SV* sv
890 Returns true if the SV has get magic or overloading. If either is true then
891 the scalar is active data, and has the potential to return a new value every
892 time it is accessed. Hence you must be careful to only read it once per user
893 logical operation and work with that returned value. If neither is true then
894 the scalar's value cannot change unless written to.
899 #define SvGAMAGIC(sv) (SvGMAGICAL(sv) || SvAMAGIC(sv))
901 #define Gv_AMG(stash) (PL_amagic_generation && Gv_AMupdate(stash))
903 #define SvWEAKREF(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_WEAKREF)) \
904 == (SVf_ROK|SVprv_WEAKREF))
905 #define SvWEAKREF_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_WEAKREF))
906 #define SvWEAKREF_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_WEAKREF))
908 #define SvPCS_IMPORTED(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_PCS_IMPORTED)) \
909 == (SVf_ROK|SVprv_PCS_IMPORTED))
910 #define SvPCS_IMPORTED_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_PCS_IMPORTED))
911 #define SvPCS_IMPORTED_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_PCS_IMPORTED))
913 #define SvTHINKFIRST(sv) (SvFLAGS(sv) & SVf_THINKFIRST)
915 #define SvPADSTALE(sv) (SvFLAGS(sv) & SVs_PADSTALE)
916 #define SvPADSTALE_on(sv) (SvFLAGS(sv) |= SVs_PADSTALE)
917 #define SvPADSTALE_off(sv) (SvFLAGS(sv) &= ~SVs_PADSTALE)
919 #define SvPADTMP(sv) (SvFLAGS(sv) & SVs_PADTMP)
920 #define SvPADTMP_on(sv) (SvFLAGS(sv) |= SVs_PADTMP)
921 #define SvPADTMP_off(sv) (SvFLAGS(sv) &= ~SVs_PADTMP)
923 #define SvPADMY(sv) (SvFLAGS(sv) & SVs_PADMY)
924 #define SvPADMY_on(sv) (SvFLAGS(sv) |= SVs_PADMY)
926 #define SvTEMP(sv) (SvFLAGS(sv) & SVs_TEMP)
927 #define SvTEMP_on(sv) (SvFLAGS(sv) |= SVs_TEMP)
928 #define SvTEMP_off(sv) (SvFLAGS(sv) &= ~SVs_TEMP)
930 #define SvOBJECT(sv) (SvFLAGS(sv) & SVs_OBJECT)
931 #define SvOBJECT_on(sv) (SvFLAGS(sv) |= SVs_OBJECT)
932 #define SvOBJECT_off(sv) (SvFLAGS(sv) &= ~SVs_OBJECT)
934 #define SvREADONLY(sv) (SvFLAGS(sv) & SVf_READONLY)
935 #define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
936 #define SvREADONLY_off(sv) (SvFLAGS(sv) &= ~SVf_READONLY)
938 #define SvSCREAM(sv) ((SvFLAGS(sv) & (SVp_SCREAM|SVp_POK)) == (SVp_SCREAM|SVp_POK))
939 #define SvSCREAM_on(sv) (SvFLAGS(sv) |= SVp_SCREAM)
940 #define SvSCREAM_off(sv) (SvFLAGS(sv) &= ~SVp_SCREAM)
942 #define SvCOMPILED(sv) (SvFLAGS(sv) & SVpfm_COMPILED)
943 #define SvCOMPILED_on(sv) (SvFLAGS(sv) |= SVpfm_COMPILED)
944 #define SvCOMPILED_off(sv) (SvFLAGS(sv) &= ~SVpfm_COMPILED)
946 #define SvEVALED(sv) (SvFLAGS(sv) & SVrepl_EVAL)
947 #define SvEVALED_on(sv) (SvFLAGS(sv) |= SVrepl_EVAL)
948 #define SvEVALED_off(sv) (SvFLAGS(sv) &= ~SVrepl_EVAL)
950 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
951 # define SvVALID(sv) ({ SV *const thwacke = (SV *) (sv); \
952 if (SvFLAGS(thwacke) & SVpbm_VALID) \
953 assert(!isGV_with_GP(thwacke)); \
954 (SvFLAGS(thwacke) & SVpbm_VALID); \
956 # define SvVALID_on(sv) ({ SV *const thwacke = (SV *) (sv); \
957 assert(!isGV_with_GP(thwacke)); \
958 (SvFLAGS(thwacke) |= SVpbm_VALID); \
960 # define SvVALID_off(sv) ({ SV *const thwacke = (SV *) (sv); \
961 assert(!isGV_with_GP(thwacke)); \
962 (SvFLAGS(thwacke) &= ~SVpbm_VALID); \
965 # define SvTAIL(sv) ({ SV *const _svi = (SV *) (sv); \
966 assert(SvTYPE(_svi) != SVt_PVAV); \
967 assert(SvTYPE(_svi) != SVt_PVHV); \
968 (SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
969 == (SVpbm_TAIL|SVpbm_VALID); \
972 # define SvVALID(sv) (SvFLAGS(sv) & SVpbm_VALID)
973 # define SvVALID_on(sv) (SvFLAGS(sv) |= SVpbm_VALID)
974 # define SvVALID_off(sv) (SvFLAGS(sv) &= ~SVpbm_VALID)
975 # define SvTAIL(sv) ((SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
976 == (SVpbm_TAIL|SVpbm_VALID))
979 #define SvTAIL_on(sv) (SvFLAGS(sv) |= SVpbm_TAIL)
980 #define SvTAIL_off(sv) (SvFLAGS(sv) &= ~SVpbm_TAIL)
984 /* The following uses the FAKE flag to show that a regex pointer is infact
985 its own offset in the regexpad for ithreads */
986 #define SvREPADTMP(sv) (SvFLAGS(sv) & SVf_FAKE)
987 #define SvREPADTMP_on(sv) (SvFLAGS(sv) |= SVf_FAKE)
988 #define SvREPADTMP_off(sv) (SvFLAGS(sv) &= ~SVf_FAKE)
991 #define SvPAD_TYPED(sv) \
992 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_TYPED)) == (SVpad_NAME|SVpad_TYPED))
994 #define SvPAD_OUR(sv) \
995 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_OUR)) == (SVpad_NAME|SVpad_OUR))
997 #define SvPAD_STATE(sv) \
998 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_STATE)) == (SVpad_NAME|SVpad_STATE))
1000 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1001 # define SvPAD_TYPED_on(sv) ({ \
1002 SV *const whap = (SV *) (sv); \
1003 assert(SvTYPE(whap) == SVt_PVMG); \
1004 (SvFLAGS(whap) |= SVpad_NAME|SVpad_TYPED); \
1006 #define SvPAD_OUR_on(sv) ({ \
1007 SV *const whap = (SV *) (sv); \
1008 assert(SvTYPE(whap) == SVt_PVMG); \
1009 (SvFLAGS(whap) |= SVpad_NAME|SVpad_OUR); \
1011 #define SvPAD_STATE_on(sv) ({ \
1012 SV *const whap = (SV *) (sv); \
1013 assert(SvTYPE(whap) == SVt_PVNV || SvTYPE(whap) == SVt_PVMG); \
1014 (SvFLAGS(whap) |= SVpad_NAME|SVpad_STATE); \
1017 # define SvPAD_TYPED_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_TYPED)
1018 # define SvPAD_OUR_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_OUR)
1019 # define SvPAD_STATE_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_STATE)
1022 #define SvOURSTASH(sv) \
1023 (SvPAD_OUR(sv) ? ((XPVMG*) SvANY(sv))->xmg_u.xmg_ourstash : NULL)
1024 #define SvOURSTASH_set(sv, st) \
1026 assert(SvTYPE(sv) == SVt_PVMG); \
1027 ((XPVMG*) SvANY(sv))->xmg_u.xmg_ourstash = st; \
1030 #ifdef PERL_DEBUG_COW
1033 #define SvRVx(sv) SvRV(sv)
1035 #ifdef PERL_DEBUG_COW
1036 /* Need -0.0 for SvNVX to preserve IEEE FP "negative zero" because
1037 +0.0 + -0.0 => +0.0 but -0.0 + -0.0 => -0.0 */
1038 # define SvIVX(sv) (0 + ((XPVIV*) SvANY(sv))->xiv_iv)
1039 # define SvUVX(sv) (0 + ((XPVUV*) SvANY(sv))->xuv_uv)
1040 # define SvNVX(sv) (-0.0 + ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv)
1041 # define SvRV(sv) (0 + (sv)->sv_u.svu_rv)
1042 /* Don't test the core XS code yet. */
1043 # if defined (PERL_CORE) && PERL_DEBUG_COW > 1
1044 # define SvPVX(sv) (0 + (assert(!SvREADONLY(sv)), (sv)->sv_u.svu_pv))
1046 # define SvPVX(sv) SvPVX_mutable(sv)
1048 # define SvCUR(sv) (0 + ((XPV*) SvANY(sv))->xpv_cur)
1049 # define SvLEN(sv) (0 + ((XPV*) SvANY(sv))->xpv_len)
1050 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1053 # define SvMAGIC(sv) (0 + *(assert(SvTYPE(sv) >= SVt_PVMG), &((XPVMG*) SvANY(sv))->xmg_u.xmg_magic))
1054 # define SvSTASH(sv) (0 + *(assert(SvTYPE(sv) >= SVt_PVMG), &((XPVMG*) SvANY(sv))->xmg_stash))
1056 # define SvMAGIC(sv) (0 + ((XPVMG*) SvANY(sv))->xmg_u.xmg_magic)
1057 # define SvSTASH(sv) (0 + ((XPVMG*) SvANY(sv))->xmg_stash)
1060 # define SvLEN(sv) ((XPV*) SvANY(sv))->xpv_len
1061 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1063 # if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1064 /* These get expanded inside other macros that already use a variable _sv */
1065 # define SvPVX(sv) \
1066 (*({ SV *const _svi = (SV *) (sv); \
1067 assert(SvTYPE(_svi) >= SVt_PV); \
1068 assert(SvTYPE(_svi) != SVt_PVAV); \
1069 assert(SvTYPE(_svi) != SVt_PVHV); \
1070 assert(!isGV_with_GP(_svi)); \
1071 &((_svi)->sv_u.svu_pv); \
1073 # define SvCUR(sv) \
1074 (*({ SV *const _svi = (SV *) (sv); \
1075 assert(SvTYPE(_svi) >= SVt_PV); \
1076 assert(SvTYPE(_svi) != SVt_PVAV); \
1077 assert(SvTYPE(_svi) != SVt_PVHV); \
1078 assert(!isGV_with_GP(_svi)); \
1079 &(((XPV*) SvANY(_svi))->xpv_cur); \
1081 # define SvIVX(sv) \
1082 (*({ SV *const _svi = (SV *) (sv); \
1083 assert(SvTYPE(_svi) == SVt_IV || SvTYPE(_svi) >= SVt_PVIV); \
1084 assert(SvTYPE(_svi) != SVt_PVAV); \
1085 assert(SvTYPE(_svi) != SVt_PVHV); \
1086 assert(SvTYPE(_svi) != SVt_PVCV); \
1087 assert(!isGV_with_GP(_svi)); \
1088 &(((XPVIV*) SvANY(_svi))->xiv_iv); \
1090 # define SvUVX(sv) \
1091 (*({ SV *const _svi = (SV *) (sv); \
1092 assert(SvTYPE(_svi) == SVt_IV || SvTYPE(_svi) >= SVt_PVIV); \
1093 assert(SvTYPE(_svi) != SVt_PVAV); \
1094 assert(SvTYPE(_svi) != SVt_PVHV); \
1095 assert(SvTYPE(_svi) != SVt_PVCV); \
1096 assert(!isGV_with_GP(_svi)); \
1097 &(((XPVUV*) SvANY(_svi))->xuv_uv); \
1099 # define SvNVX(sv) \
1100 (*({ SV *const _svi = (SV *) (sv); \
1101 assert(SvTYPE(_svi) == SVt_NV || SvTYPE(_svi) >= SVt_PVNV); \
1102 assert(SvTYPE(_svi) != SVt_PVAV); \
1103 assert(SvTYPE(_svi) != SVt_PVHV); \
1104 assert(SvTYPE(_svi) != SVt_PVCV); \
1105 assert(SvTYPE(_svi) != SVt_PVFM); \
1106 assert(!isGV_with_GP(_svi)); \
1107 &(((XPVNV*) SvANY(_svi))->xnv_u.xnv_nv); \
1110 (*({ SV *const _svi = (SV *) (sv); \
1111 assert(SvTYPE(_svi) >= SVt_PV || SvTYPE(_svi) == SVt_IV); \
1112 assert(SvTYPE(_svi) != SVt_PVAV); \
1113 assert(SvTYPE(_svi) != SVt_PVHV); \
1114 assert(SvTYPE(_svi) != SVt_PVCV); \
1115 assert(SvTYPE(_svi) != SVt_PVFM); \
1116 assert(!isGV_with_GP(_svi)); \
1117 &((_svi)->sv_u.svu_rv); \
1119 # define SvMAGIC(sv) \
1120 (*({ SV *const _svi = (SV *) (sv); \
1121 assert(SvTYPE(_svi) >= SVt_PVMG); \
1122 if(SvTYPE(_svi) == SVt_PVMG) \
1123 assert(!SvPAD_OUR(_svi)); \
1124 &(((XPVMG*) SvANY(_svi))->xmg_u.xmg_magic); \
1126 # define SvSTASH(sv) \
1127 (*({ SV *const _svi = (SV *) (sv); \
1128 assert(SvTYPE(_svi) >= SVt_PVMG); \
1129 &(((XPVMG*) SvANY(_svi))->xmg_stash); \
1132 # define SvPVX(sv) ((sv)->sv_u.svu_pv)
1133 # define SvCUR(sv) ((XPV*) SvANY(sv))->xpv_cur
1134 # define SvIVX(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1135 # define SvUVX(sv) ((XPVUV*) SvANY(sv))->xuv_uv
1136 # define SvNVX(sv) ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv
1137 # define SvRV(sv) ((sv)->sv_u.svu_rv)
1138 # define SvMAGIC(sv) ((XPVMG*) SvANY(sv))->xmg_u.xmg_magic
1139 # define SvSTASH(sv) ((XPVMG*) SvANY(sv))->xmg_stash
1144 /* Given that these two are new, there can't be any existing code using them
1146 # define SvPVX_mutable(sv) (0 + (sv)->sv_u.svu_pv)
1147 # define SvPVX_const(sv) ((const char*)(0 + (sv)->sv_u.svu_pv))
1149 /* Except for the poison code, which uses & to scribble over the pointer after
1150 free() is called. */
1151 # define SvPVX_mutable(sv) ((sv)->sv_u.svu_pv)
1152 # define SvPVX_const(sv) ((const char*)((sv)->sv_u.svu_pv))
1155 #define SvIVXx(sv) SvIVX(sv)
1156 #define SvUVXx(sv) SvUVX(sv)
1157 #define SvNVXx(sv) SvNVX(sv)
1158 #define SvPVXx(sv) SvPVX(sv)
1159 #define SvLENx(sv) SvLEN(sv)
1160 #define SvENDx(sv) ((PL_Sv = (sv)), SvEND(PL_Sv))
1163 /* Ask a scalar nicely to try to become an IV, if possible.
1164 Not guaranteed to stay returning void */
1165 /* Macro won't actually call sv_2iv if already IOK */
1166 #define SvIV_please(sv) \
1167 STMT_START {if (!SvIOKp(sv) && (SvNOK(sv) || SvPOK(sv))) \
1168 (void) SvIV(sv); } STMT_END
1169 #define SvIV_set(sv, val) \
1170 STMT_START { assert(SvTYPE(sv) == SVt_IV || SvTYPE(sv) >= SVt_PVIV); \
1171 assert(SvTYPE(sv) != SVt_PVAV); \
1172 assert(SvTYPE(sv) != SVt_PVHV); \
1173 assert(SvTYPE(sv) != SVt_PVCV); \
1174 assert(!isGV_with_GP(sv)); \
1175 (((XPVIV*) SvANY(sv))->xiv_iv = (val)); } STMT_END
1176 #define SvNV_set(sv, val) \
1177 STMT_START { assert(SvTYPE(sv) == SVt_NV || SvTYPE(sv) >= SVt_PVNV); \
1178 assert(SvTYPE(sv) != SVt_PVAV); assert(SvTYPE(sv) != SVt_PVHV); \
1179 assert(SvTYPE(sv) != SVt_PVCV); assert(SvTYPE(sv) != SVt_PVFM); \
1180 assert(!isGV_with_GP(sv)); \
1181 (((XPVNV*)SvANY(sv))->xnv_u.xnv_nv = (val)); } STMT_END
1182 #define SvPV_set(sv, val) \
1183 STMT_START { assert(SvTYPE(sv) >= SVt_PV); \
1184 assert(SvTYPE(sv) != SVt_PVAV); \
1185 assert(SvTYPE(sv) != SVt_PVHV); \
1186 assert(!isGV_with_GP(sv)); \
1187 ((sv)->sv_u.svu_pv = (val)); } STMT_END
1188 #define SvUV_set(sv, val) \
1189 STMT_START { assert(SvTYPE(sv) == SVt_IV || SvTYPE(sv) >= SVt_PVIV); \
1190 assert(SvTYPE(sv) != SVt_PVAV); \
1191 assert(SvTYPE(sv) != SVt_PVHV); \
1192 assert(SvTYPE(sv) != SVt_PVCV); \
1193 assert(!isGV_with_GP(sv)); \
1194 (((XPVUV*)SvANY(sv))->xuv_uv = (val)); } STMT_END
1195 #define SvRV_set(sv, val) \
1196 STMT_START { assert(SvTYPE(sv) >= SVt_PV || SvTYPE(sv) == SVt_IV); \
1197 assert(SvTYPE(sv) != SVt_PVAV); \
1198 assert(SvTYPE(sv) != SVt_PVHV); \
1199 assert(SvTYPE(sv) != SVt_PVCV); \
1200 assert(SvTYPE(sv) != SVt_PVFM); \
1201 assert(!isGV_with_GP(sv)); \
1202 ((sv)->sv_u.svu_rv = (val)); } STMT_END
1203 #define SvMAGIC_set(sv, val) \
1204 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1205 (((XPVMG*)SvANY(sv))->xmg_u.xmg_magic = (val)); } STMT_END
1206 #define SvSTASH_set(sv, val) \
1207 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1208 (((XPVMG*) SvANY(sv))->xmg_stash = (val)); } STMT_END
1209 #define SvCUR_set(sv, val) \
1210 STMT_START { assert(SvTYPE(sv) >= SVt_PV); \
1211 assert(SvTYPE(sv) != SVt_PVAV); \
1212 assert(SvTYPE(sv) != SVt_PVHV); \
1213 assert(!isGV_with_GP(sv)); \
1214 (((XPV*) SvANY(sv))->xpv_cur = (val)); } STMT_END
1215 #define SvLEN_set(sv, val) \
1216 STMT_START { assert(SvTYPE(sv) >= SVt_PV); \
1217 assert(SvTYPE(sv) != SVt_PVAV); \
1218 assert(SvTYPE(sv) != SVt_PVHV); \
1219 assert(!isGV_with_GP(sv)); \
1220 (((XPV*) SvANY(sv))->xpv_len = (val)); } STMT_END
1221 #define SvEND_set(sv, val) \
1222 STMT_START { assert(SvTYPE(sv) >= SVt_PV); \
1223 (SvCUR(sv) = (val) - SvPVX(sv)); } STMT_END
1225 #define SvPV_renew(sv,n) \
1226 STMT_START { SvLEN_set(sv, n); \
1227 SvPV_set((sv), (MEM_WRAP_CHECK_(n,char) \
1228 (char*)saferealloc((Malloc_t)SvPVX(sv), \
1229 (MEM_SIZE)((n))))); \
1232 #define SvPV_shrink_to_cur(sv) STMT_START { \
1233 const STRLEN _lEnGtH = SvCUR(sv) + 1; \
1234 SvPV_renew(sv, _lEnGtH); \
1237 #define SvPV_free(sv) \
1239 assert(SvTYPE(sv) >= SVt_PV); \
1241 assert(!SvROK(sv)); \
1243 SvPV_set(sv, SvPVX_mutable(sv) \
1244 - sv_read_offset(sv)); \
1245 SvFLAGS(sv) &= ~SVf_OOK; \
1247 Safefree(SvPVX(sv)); \
1252 /* Code that crops up in three places to take a scalar and ready it to hold
1254 # define prepare_SV_for_RV(sv) \
1256 if (SvTYPE(sv) < SVt_PV && SvTYPE(sv) != SVt_IV) \
1257 sv_upgrade(sv, SVt_IV); \
1258 else if (SvTYPE(sv) >= SVt_PV) { \
1266 #define PERL_FBM_TABLE_OFFSET 1 /* Number of bytes between EOS and table */
1268 /* SvPOKp not SvPOK in the assertion because the string can be tainted! eg
1271 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1272 # define BmFLAGS(sv) \
1273 (*({ SV *const uggh = (SV *) (sv); \
1274 assert(SvTYPE(uggh) == SVt_PVGV); \
1275 assert(SvVALID(uggh)); \
1276 &(((XPVGV*) SvANY(uggh))->xnv_u.xbm_s.xbm_flags); \
1278 # define BmRARE(sv) \
1279 (*({ SV *const uggh = (SV *) (sv); \
1280 assert(SvTYPE(uggh) == SVt_PVGV); \
1281 assert(SvVALID(uggh)); \
1282 &(((XPVGV*) SvANY(uggh))->xnv_u.xbm_s.xbm_rare); \
1284 # define BmUSEFUL(sv) \
1285 (*({ SV *const uggh = (SV *) (sv); \
1286 assert(SvTYPE(uggh) == SVt_PVGV); \
1287 assert(SvVALID(uggh)); \
1288 assert(!SvIOK(uggh)); \
1289 &(((XPVGV*) SvANY(uggh))->xiv_u.xivu_i32); \
1291 # define BmPREVIOUS(sv) \
1292 (*({ SV *const uggh = (SV *) (sv); \
1293 assert(SvTYPE(uggh) == SVt_PVGV); \
1294 assert(SvVALID(uggh)); \
1295 &(((XPVGV*) SvANY(uggh))->xnv_u.xbm_s.xbm_previous); \
1298 # define BmFLAGS(sv) ((XPVGV*) SvANY(sv))->xnv_u.xbm_s.xbm_flags
1299 # define BmRARE(sv) ((XPVGV*) SvANY(sv))->xnv_u.xbm_s.xbm_rare
1300 # define BmUSEFUL(sv) ((XPVGV*) SvANY(sv))->xiv_u.xivu_i32
1301 # define BmPREVIOUS(sv) ((XPVGV*) SvANY(sv))->xnv_u.xbm_s.xbm_previous
1305 #define FmLINES(sv) ((XPVFM*) SvANY(sv))->xfm_lines
1307 #define LvTYPE(sv) ((XPVLV*) SvANY(sv))->xlv_type
1308 #define LvTARG(sv) ((XPVLV*) SvANY(sv))->xlv_targ
1309 #define LvTARGOFF(sv) ((XPVLV*) SvANY(sv))->xlv_targoff
1310 #define LvTARGLEN(sv) ((XPVLV*) SvANY(sv))->xlv_targlen
1312 #define IoIFP(sv) ((XPVIO*) SvANY(sv))->xio_ifp
1313 #define IoOFP(sv) ((XPVIO*) SvANY(sv))->xio_ofp
1314 #define IoDIRP(sv) ((XPVIO*) SvANY(sv))->xio_dirp
1315 #define IoANY(sv) ((XPVIO*) SvANY(sv))->xio_any
1316 #define IoLINES(sv) ((XPVIO*) SvANY(sv))->xio_lines
1317 #define IoPAGE(sv) ((XPVIO*) SvANY(sv))->xio_page
1318 #define IoPAGE_LEN(sv) ((XPVIO*) SvANY(sv))->xio_page_len
1319 #define IoLINES_LEFT(sv)((XPVIO*) SvANY(sv))->xio_lines_left
1320 #define IoTOP_NAME(sv) ((XPVIO*) SvANY(sv))->xio_top_name
1321 #define IoTOP_GV(sv) ((XPVIO*) SvANY(sv))->xio_top_gv
1322 #define IoFMT_NAME(sv) ((XPVIO*) SvANY(sv))->xio_fmt_name
1323 #define IoFMT_GV(sv) ((XPVIO*) SvANY(sv))->xio_fmt_gv
1324 #define IoBOTTOM_NAME(sv)((XPVIO*) SvANY(sv))->xio_bottom_name
1325 #define IoBOTTOM_GV(sv) ((XPVIO*) SvANY(sv))->xio_bottom_gv
1326 #define IoTYPE(sv) ((XPVIO*) SvANY(sv))->xio_type
1327 #define IoFLAGS(sv) ((XPVIO*) SvANY(sv))->xio_flags
1329 /* IoTYPE(sv) is a single character telling the type of I/O connection. */
1330 #define IoTYPE_RDONLY '<'
1331 #define IoTYPE_WRONLY '>'
1332 #define IoTYPE_RDWR '+'
1333 #define IoTYPE_APPEND 'a'
1334 #define IoTYPE_PIPE '|'
1335 #define IoTYPE_STD '-' /* stdin or stdout */
1336 #define IoTYPE_SOCKET 's'
1337 #define IoTYPE_CLOSED ' '
1338 #define IoTYPE_IMPLICIT 'I' /* stdin or stdout or stderr */
1339 #define IoTYPE_NUMERIC '#' /* fdopen */
1342 =for apidoc Am|bool|SvTAINTED|SV* sv
1343 Checks to see if an SV is tainted. Returns TRUE if it is, FALSE if
1346 =for apidoc Am|void|SvTAINTED_on|SV* sv
1347 Marks an SV as tainted if tainting is enabled.
1349 =for apidoc Am|void|SvTAINTED_off|SV* sv
1350 Untaints an SV. Be I<very> careful with this routine, as it short-circuits
1351 some of Perl's fundamental security features. XS module authors should not
1352 use this function unless they fully understand all the implications of
1353 unconditionally untainting the value. Untainting should be done in the
1354 standard perl fashion, via a carefully crafted regexp, rather than directly
1355 untainting variables.
1357 =for apidoc Am|void|SvTAINT|SV* sv
1358 Taints an SV if tainting is enabled.
1363 #define sv_taint(sv) sv_magic((sv), NULL, PERL_MAGIC_taint, NULL, 0)
1365 #define SvTAINTED(sv) (SvMAGICAL(sv) && sv_tainted(sv))
1366 #define SvTAINTED_on(sv) STMT_START{ if(PL_tainting){sv_taint(sv);} }STMT_END
1367 #define SvTAINTED_off(sv) STMT_START{ if(PL_tainting){sv_untaint(sv);} }STMT_END
1369 #define SvTAINT(sv) \
1371 if (PL_tainting) { \
1378 =for apidoc Am|char*|SvPV_force|SV* sv|STRLEN len
1379 Like C<SvPV> but will force the SV into containing just a string
1380 (C<SvPOK_only>). You want force if you are going to update the C<SvPVX>
1383 =for apidoc Am|char*|SvPV_force_nomg|SV* sv|STRLEN len
1384 Like C<SvPV> but will force the SV into containing just a string
1385 (C<SvPOK_only>). You want force if you are going to update the C<SvPVX>
1386 directly. Doesn't process magic.
1388 =for apidoc Am|char*|SvPV|SV* sv|STRLEN len
1389 Returns a pointer to the string in the SV, or a stringified form of
1390 the SV if the SV does not contain a string. The SV may cache the
1391 stringified version becoming C<SvPOK>. Handles 'get' magic. See also
1392 C<SvPVx> for a version which guarantees to evaluate sv only once.
1394 =for apidoc Am|char*|SvPVx|SV* sv|STRLEN len
1395 A version of C<SvPV> which guarantees to evaluate C<sv> only once.
1396 Only use this if C<sv> is an expression with side effects, otherwise use the
1397 more efficient C<SvPVX>.
1399 =for apidoc Am|char*|SvPV_nomg|SV* sv|STRLEN len
1400 Like C<SvPV> but doesn't process magic.
1402 =for apidoc Am|char*|SvPV_nolen|SV* sv
1403 Returns a pointer to the string in the SV, or a stringified form of
1404 the SV if the SV does not contain a string. The SV may cache the
1405 stringified form becoming C<SvPOK>. Handles 'get' magic.
1407 =for apidoc Am|IV|SvIV|SV* sv
1408 Coerces the given SV to an integer and returns it. See C<SvIVx> for a
1409 version which guarantees to evaluate sv only once.
1411 =for apidoc Am|IV|SvIV_nomg|SV* sv
1412 Like C<SvIV> but doesn't process magic.
1414 =for apidoc Am|IV|SvIVx|SV* sv
1415 Coerces the given SV to an integer and returns it. Guarantees to evaluate
1416 C<sv> only once. Only use this if C<sv> is an expression with side effects,
1417 otherwise use the more efficient C<SvIV>.
1419 =for apidoc Am|NV|SvNV|SV* sv
1420 Coerce the given SV to a double and return it. See C<SvNVx> for a version
1421 which guarantees to evaluate sv only once.
1423 =for apidoc Am|NV|SvNVx|SV* sv
1424 Coerces the given SV to a double and returns it. Guarantees to evaluate
1425 C<sv> only once. Only use this if C<sv> is an expression with side effects,
1426 otherwise use the more efficient C<SvNV>.
1428 =for apidoc Am|UV|SvUV|SV* sv
1429 Coerces the given SV to an unsigned integer and returns it. See C<SvUVx>
1430 for a version which guarantees to evaluate sv only once.
1432 =for apidoc Am|UV|SvUV_nomg|SV* sv
1433 Like C<SvUV> but doesn't process magic.
1435 =for apidoc Am|UV|SvUVx|SV* sv
1436 Coerces the given SV to an unsigned integer and returns it. Guarantees to
1437 C<sv> only once. Only use this if C<sv> is an expression with side effects,
1438 otherwise use the more efficient C<SvUV>.
1440 =for apidoc Am|bool|SvTRUE|SV* sv
1441 Returns a boolean indicating whether Perl would evaluate the SV as true or
1442 false, defined or undefined. Does not handle 'get' magic.
1444 =for apidoc Am|char*|SvPVutf8_force|SV* sv|STRLEN len
1445 Like C<SvPV_force>, but converts sv to utf8 first if necessary.
1447 =for apidoc Am|char*|SvPVutf8|SV* sv|STRLEN len
1448 Like C<SvPV>, but converts sv to utf8 first if necessary.
1450 =for apidoc Am|char*|SvPVutf8_nolen|SV* sv
1451 Like C<SvPV_nolen>, but converts sv to utf8 first if necessary.
1453 =for apidoc Am|char*|SvPVbyte_force|SV* sv|STRLEN len
1454 Like C<SvPV_force>, but converts sv to byte representation first if necessary.
1456 =for apidoc Am|char*|SvPVbyte|SV* sv|STRLEN len
1457 Like C<SvPV>, but converts sv to byte representation first if necessary.
1459 =for apidoc Am|char*|SvPVbyte_nolen|SV* sv
1460 Like C<SvPV_nolen>, but converts sv to byte representation first if necessary.
1462 =for apidoc Am|char*|SvPVutf8x_force|SV* sv|STRLEN len
1463 Like C<SvPV_force>, but converts sv to utf8 first if necessary.
1464 Guarantees to evaluate sv only once; use the more efficient C<SvPVutf8_force>
1467 =for apidoc Am|char*|SvPVutf8x|SV* sv|STRLEN len
1468 Like C<SvPV>, but converts sv to utf8 first if necessary.
1469 Guarantees to evaluate sv only once; use the more efficient C<SvPVutf8>
1472 =for apidoc Am|char*|SvPVbytex_force|SV* sv|STRLEN len
1473 Like C<SvPV_force>, but converts sv to byte representation first if necessary.
1474 Guarantees to evaluate sv only once; use the more efficient C<SvPVbyte_force>
1477 =for apidoc Am|char*|SvPVbytex|SV* sv|STRLEN len
1478 Like C<SvPV>, but converts sv to byte representation first if necessary.
1479 Guarantees to evaluate sv only once; use the more efficient C<SvPVbyte>
1482 =for apidoc Am|bool|SvIsCOW|SV* sv
1483 Returns a boolean indicating whether the SV is Copy-On-Write. (either shared
1484 hash key scalars, or full Copy On Write scalars if 5.9.0 is configured for
1487 =for apidoc Am|bool|SvIsCOW_shared_hash|SV* sv
1488 Returns a boolean indicating whether the SV is Copy-On-Write shared hash key
1491 =for apidoc Am|void|sv_catpvn_nomg|SV* sv|const char* ptr|STRLEN len
1492 Like C<sv_catpvn> but doesn't process magic.
1494 =for apidoc Am|void|sv_setsv_nomg|SV* dsv|SV* ssv
1495 Like C<sv_setsv> but doesn't process magic.
1497 =for apidoc Am|void|sv_catsv_nomg|SV* dsv|SV* ssv
1498 Like C<sv_catsv> but doesn't process magic.
1503 /* Let us hope that bitmaps for UV and IV are the same */
1504 #define SvIV(sv) (SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv))
1505 #define SvUV(sv) (SvIOK(sv) ? SvUVX(sv) : sv_2uv(sv))
1506 #define SvNV(sv) (SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv))
1508 #define SvIV_nomg(sv) (SvIOK(sv) ? SvIVX(sv) : sv_2iv_flags(sv, 0))
1509 #define SvUV_nomg(sv) (SvIOK(sv) ? SvUVX(sv) : sv_2uv_flags(sv, 0))
1513 #define SvPV(sv, lp) SvPV_flags(sv, lp, SV_GMAGIC)
1514 #define SvPV_const(sv, lp) SvPV_flags_const(sv, lp, SV_GMAGIC)
1515 #define SvPV_mutable(sv, lp) SvPV_flags_mutable(sv, lp, SV_GMAGIC)
1517 #define SvPV_flags(sv, lp, flags) \
1518 ((SvFLAGS(sv) & (SVf_POK)) == SVf_POK \
1519 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pv_flags(sv, &lp, flags))
1520 #define SvPV_flags_const(sv, lp, flags) \
1521 ((SvFLAGS(sv) & (SVf_POK)) == SVf_POK \
1522 ? ((lp = SvCUR(sv)), SvPVX_const(sv)) : \
1523 (const char*) sv_2pv_flags(sv, &lp, flags|SV_CONST_RETURN))
1524 #define SvPV_flags_const_nolen(sv, flags) \
1525 ((SvFLAGS(sv) & (SVf_POK)) == SVf_POK \
1526 ? SvPVX_const(sv) : \
1527 (const char*) sv_2pv_flags(sv, 0, flags|SV_CONST_RETURN))
1528 #define SvPV_flags_mutable(sv, lp, flags) \
1529 ((SvFLAGS(sv) & (SVf_POK)) == SVf_POK \
1530 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) : \
1531 sv_2pv_flags(sv, &lp, flags|SV_MUTABLE_RETURN))
1533 #define SvPV_force(sv, lp) SvPV_force_flags(sv, lp, SV_GMAGIC)
1534 #define SvPV_force_nolen(sv) SvPV_force_flags_nolen(sv, SV_GMAGIC)
1535 #define SvPV_force_mutable(sv, lp) SvPV_force_flags_mutable(sv, lp, SV_GMAGIC)
1537 #define SvPV_force_nomg(sv, lp) SvPV_force_flags(sv, lp, 0)
1538 #define SvPV_force_nomg_nolen(sv) SvPV_force_flags_nolen(sv, 0)
1540 #define SvPV_force_flags(sv, lp, flags) \
1541 ((SvFLAGS(sv) & (SVf_POK|SVf_THINKFIRST)) == SVf_POK \
1542 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvn_force_flags(sv, &lp, flags))
1543 #define SvPV_force_flags_nolen(sv, flags) \
1544 ((SvFLAGS(sv) & (SVf_POK|SVf_THINKFIRST)) == SVf_POK \
1545 ? SvPVX(sv) : sv_pvn_force_flags(sv, 0, flags))
1546 #define SvPV_force_flags_mutable(sv, lp, flags) \
1547 ((SvFLAGS(sv) & (SVf_POK|SVf_THINKFIRST)) == SVf_POK \
1548 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) \
1549 : sv_pvn_force_flags(sv, &lp, flags|SV_MUTABLE_RETURN))
1551 #define SvPV_nolen(sv) \
1552 ((SvFLAGS(sv) & (SVf_POK)) == SVf_POK \
1553 ? SvPVX(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC))
1555 #define SvPV_nolen_const(sv) \
1556 ((SvFLAGS(sv) & (SVf_POK)) == SVf_POK \
1557 ? SvPVX_const(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC|SV_CONST_RETURN))
1559 #define SvPV_nomg(sv, lp) SvPV_flags(sv, lp, 0)
1560 #define SvPV_nomg_const(sv, lp) SvPV_flags_const(sv, lp, 0)
1561 #define SvPV_nomg_const_nolen(sv) SvPV_flags_const_nolen(sv, 0)
1565 #define SvPVutf8(sv, lp) \
1566 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8)) == (SVf_POK|SVf_UTF8) \
1567 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvutf8(sv, &lp))
1569 #define SvPVutf8_force(sv, lp) \
1570 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST)) == (SVf_POK|SVf_UTF8) \
1571 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvutf8n_force(sv, &lp))
1574 #define SvPVutf8_nolen(sv) \
1575 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8)) == (SVf_POK|SVf_UTF8)\
1576 ? SvPVX(sv) : sv_2pvutf8(sv, 0))
1580 #define SvPVbyte(sv, lp) \
1581 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8)) == (SVf_POK) \
1582 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvbyte(sv, &lp))
1584 #define SvPVbyte_force(sv, lp) \
1585 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST)) == (SVf_POK) \
1586 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvbyten_force(sv, &lp))
1588 #define SvPVbyte_nolen(sv) \
1589 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8)) == (SVf_POK)\
1590 ? SvPVX(sv) : sv_2pvbyte(sv, 0))
1594 /* define FOOx(): idempotent versions of FOO(). If possible, use a local
1595 * var to evaluate the arg once; failing that, use a global if possible;
1596 * failing that, call a function to do the work
1599 #define SvPVx_force(sv, lp) sv_pvn_force(sv, &lp)
1600 #define SvPVutf8x_force(sv, lp) sv_pvutf8n_force(sv, &lp)
1601 #define SvPVbytex_force(sv, lp) sv_pvbyten_force(sv, &lp)
1603 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1605 # define SvIVx(sv) ({SV *_sv = (SV*)(sv); SvIV(_sv); })
1606 # define SvUVx(sv) ({SV *_sv = (SV*)(sv); SvUV(_sv); })
1607 # define SvNVx(sv) ({SV *_sv = (SV*)(sv); SvNV(_sv); })
1608 # define SvPVx(sv, lp) ({SV *_sv = (sv); SvPV(_sv, lp); })
1609 # define SvPVx_const(sv, lp) ({SV *_sv = (sv); SvPV_const(_sv, lp); })
1610 # define SvPVx_nolen(sv) ({SV *_sv = (sv); SvPV_nolen(_sv); })
1611 # define SvPVx_nolen_const(sv) ({SV *_sv = (sv); SvPV_nolen_const(_sv); })
1612 # define SvPVutf8x(sv, lp) ({SV *_sv = (sv); SvPVutf8(_sv, lp); })
1613 # define SvPVbytex(sv, lp) ({SV *_sv = (sv); SvPVbyte(_sv, lp); })
1614 # define SvPVbytex_nolen(sv) ({SV *_sv = (sv); SvPVbyte_nolen(_sv); })
1615 # define SvTRUE(sv) ( \
1619 ? (({XPV *nxpv = (XPV*)SvANY(sv); \
1621 (nxpv->xpv_cur > 1 || \
1622 (nxpv->xpv_cur && *(sv)->sv_u.svu_pv != '0')); }) \
1629 ? SvNVX(sv) != 0.0 \
1631 # define SvTRUEx(sv) ({SV *_sv = (sv); SvTRUE(_sv); })
1633 #else /* __GNUC__ */
1635 /* These inlined macros use globals, which will require a thread
1636 * declaration in user code, so we avoid them under threads */
1638 # define SvIVx(sv) ((PL_Sv = (sv)), SvIV(PL_Sv))
1639 # define SvUVx(sv) ((PL_Sv = (sv)), SvUV(PL_Sv))
1640 # define SvNVx(sv) ((PL_Sv = (sv)), SvNV(PL_Sv))
1641 # define SvPVx(sv, lp) ((PL_Sv = (sv)), SvPV(PL_Sv, lp))
1642 # define SvPVx_const(sv, lp) ((PL_Sv = (sv)), SvPV_const(PL_Sv, lp))
1643 # define SvPVx_nolen(sv) ((PL_Sv = (sv)), SvPV_nolen(PL_Sv))
1644 # define SvPVx_nolen_const(sv) ((PL_Sv = (sv)), SvPV_nolen_const(PL_Sv))
1645 # define SvPVutf8x(sv, lp) ((PL_Sv = (sv)), SvPVutf8(PL_Sv, lp))
1646 # define SvPVbytex(sv, lp) ((PL_Sv = (sv)), SvPVbyte(PL_Sv, lp))
1647 # define SvPVbytex_nolen(sv) ((PL_Sv = (sv)), SvPVbyte_nolen(PL_Sv))
1648 # define SvTRUE(sv) ( \
1652 ? ((PL_Xpv = (XPV*)SvANY(PL_Sv = (sv))) && \
1653 (PL_Xpv->xpv_cur > 1 || \
1654 (PL_Xpv->xpv_cur && *PL_Sv->sv_u.svu_pv != '0')) \
1661 ? SvNVX(sv) != 0.0 \
1663 # define SvTRUEx(sv) ((PL_Sv = (sv)), SvTRUE(PL_Sv))
1664 #endif /* __GNU__ */
1666 #define SvIsCOW(sv) ((SvFLAGS(sv) & (SVf_FAKE | SVf_READONLY)) == \
1667 (SVf_FAKE | SVf_READONLY))
1668 #define SvIsCOW_shared_hash(sv) (SvIsCOW(sv) && SvLEN(sv) == 0)
1670 #define SvSHARED_HEK_FROM_PV(pvx) \
1671 ((struct hek*)(pvx - STRUCT_OFFSET(struct hek, hek_key)))
1672 #define SvSHARED_HASH(sv) (0 + SvSHARED_HEK_FROM_PV(SvPVX_const(sv))->hek_hash)
1674 /* flag values for sv_*_flags functions */
1675 #define SV_IMMEDIATE_UNREF 1
1677 #define SV_COW_DROP_PV 4
1678 #define SV_UTF8_NO_ENCODING 8
1679 #define SV_NOSTEAL 16
1680 #define SV_CONST_RETURN 32
1681 #define SV_MUTABLE_RETURN 64
1682 #define SV_SMAGIC 128
1683 #define SV_HAS_TRAILING_NUL 256
1684 #define SV_COW_SHARED_HASH_KEYS 512
1685 /* This one is only enabled for PERL_OLD_COPY_ON_WRITE */
1686 #define SV_COW_OTHER_PVS 1024
1688 /* The core is safe for this COW optimisation. XS code on CPAN may not be.
1689 So only default to doing the COW setup if we're in the core.
1692 # ifndef SV_DO_COW_SVSETSV
1693 # define SV_DO_COW_SVSETSV SV_COW_SHARED_HASH_KEYS|SV_COW_OTHER_PVS
1697 #ifndef SV_DO_COW_SVSETSV
1698 # define SV_DO_COW_SVSETSV 0
1702 #define sv_unref(sv) sv_unref_flags(sv, 0)
1703 #define sv_force_normal(sv) sv_force_normal_flags(sv, 0)
1704 #define sv_usepvn(sv, p, l) sv_usepvn_flags(sv, p, l, 0)
1705 #define sv_usepvn_mg(sv, p, l) sv_usepvn_flags(sv, p, l, SV_SMAGIC)
1707 /* We are about to replace the SV's current value. So if it's copy on write
1708 we need to normalise it. Use the SV_COW_DROP_PV flag hint to say that
1709 the value is about to get thrown away, so drop the PV rather than go to
1710 the effort of making a read-write copy only for it to get immediately
1713 #define SV_CHECK_THINKFIRST_COW_DROP(sv) if (SvTHINKFIRST(sv)) \
1714 sv_force_normal_flags(sv, SV_COW_DROP_PV)
1716 #ifdef PERL_OLD_COPY_ON_WRITE
1717 #define SvRELEASE_IVX(sv) \
1718 ((SvIsCOW(sv) ? sv_force_normal_flags(sv, 0) : (void) 0), 0)
1719 # define SvIsCOW_normal(sv) (SvIsCOW(sv) && SvLEN(sv))
1720 # define SvRELEASE_IVX_(sv) SvRELEASE_IVX(sv),
1722 # define SvRELEASE_IVX(sv) 0
1723 /* This little game brought to you by the need to shut this warning up:
1724 mg.c: In function `Perl_magic_get':
1725 mg.c:1024: warning: left-hand operand of comma expression has no effect
1727 # define SvRELEASE_IVX_(sv) /**/
1728 #endif /* PERL_OLD_COPY_ON_WRITE */
1730 #define CAN_COW_MASK (SVs_OBJECT|SVs_GMG|SVs_SMG|SVs_RMG|SVf_IOK|SVf_NOK| \
1731 SVf_POK|SVf_ROK|SVp_IOK|SVp_NOK|SVp_POK|SVf_FAKE| \
1732 SVf_OOK|SVf_BREAK|SVf_READONLY)
1733 #define CAN_COW_FLAGS (SVp_POK|SVf_POK)
1735 #define SV_CHECK_THINKFIRST(sv) if (SvTHINKFIRST(sv)) \
1736 sv_force_normal_flags(sv, 0)
1739 /* all these 'functions' are now just macros */
1741 #define sv_pv(sv) SvPV_nolen(sv)
1742 #define sv_pvutf8(sv) SvPVutf8_nolen(sv)
1743 #define sv_pvbyte(sv) SvPVbyte_nolen(sv)
1745 #define sv_pvn_force_nomg(sv, lp) sv_pvn_force_flags(sv, lp, 0)
1746 #define sv_utf8_upgrade_nomg(sv) sv_utf8_upgrade_flags(sv, 0)
1747 #define sv_catpvn_nomg(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, 0)
1748 #define sv_setsv(dsv, ssv) \
1749 sv_setsv_flags(dsv, ssv, SV_GMAGIC|SV_DO_COW_SVSETSV)
1750 #define sv_setsv_nomg(dsv, ssv) sv_setsv_flags(dsv, ssv, SV_DO_COW_SVSETSV)
1751 #define sv_catsv(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC)
1752 #define sv_catsv_nomg(dsv, ssv) sv_catsv_flags(dsv, ssv, 0)
1753 #define sv_catsv_mg(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC|SV_SMAGIC)
1754 #define sv_catpvn(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, SV_GMAGIC)
1755 #define sv_catpvn_mg(sv, sstr, slen) \
1756 sv_catpvn_flags(sv, sstr, slen, SV_GMAGIC|SV_SMAGIC);
1757 #define sv_2pv(sv, lp) sv_2pv_flags(sv, lp, SV_GMAGIC)
1758 #define sv_2pv_nolen(sv) sv_2pv(sv, 0)
1759 #define sv_2pvbyte_nolen(sv) sv_2pvbyte(sv, 0)
1760 #define sv_2pvutf8_nolen(sv) sv_2pvutf8(sv, 0)
1761 #define sv_2pv_nomg(sv, lp) sv_2pv_flags(sv, lp, 0)
1762 #define sv_pvn_force(sv, lp) sv_pvn_force_flags(sv, lp, SV_GMAGIC)
1763 #define sv_utf8_upgrade(sv) sv_utf8_upgrade_flags(sv, SV_GMAGIC)
1764 #define sv_2iv(sv) sv_2iv_flags(sv, SV_GMAGIC)
1765 #define sv_2uv(sv) sv_2uv_flags(sv, SV_GMAGIC)
1767 /* Should be named SvCatPVN_utf8_upgrade? */
1768 #define sv_catpvn_utf8_upgrade(dsv, sstr, slen, nsv) \
1771 nsv = newSVpvn_flags(sstr, slen, SVs_TEMP); \
1773 sv_setpvn(nsv, sstr, slen); \
1775 sv_utf8_upgrade(nsv); \
1776 sv_catsv(dsv, nsv); \
1780 =for apidoc Am|SV*|newRV_inc|SV* sv
1782 Creates an RV wrapper for an SV. The reference count for the original SV is
1788 #define newRV_inc(sv) newRV(sv)
1790 /* the following macros update any magic values this sv is associated with */
1793 =head1 Magical Functions
1795 =for apidoc Am|void|SvGETMAGIC|SV* sv
1796 Invokes C<mg_get> on an SV if it has 'get' magic. This macro evaluates its
1797 argument more than once.
1799 =for apidoc Am|void|SvSETMAGIC|SV* sv
1800 Invokes C<mg_set> on an SV if it has 'set' magic. This macro evaluates its
1801 argument more than once.
1803 =for apidoc Am|void|SvSetSV|SV* dsb|SV* ssv
1804 Calls C<sv_setsv> if dsv is not the same as ssv. May evaluate arguments
1807 =for apidoc Am|void|SvSetSV_nosteal|SV* dsv|SV* ssv
1808 Calls a non-destructive version of C<sv_setsv> if dsv is not the same as
1809 ssv. May evaluate arguments more than once.
1811 =for apidoc Am|void|SvSetMagicSV|SV* dsb|SV* ssv
1812 Like C<SvSetSV>, but does any set magic required afterwards.
1814 =for apidoc Am|void|SvSetMagicSV_nosteal|SV* dsv|SV* ssv
1815 Like C<SvSetSV_nosteal>, but does any set magic required afterwards.
1817 =for apidoc Am|void|SvSHARE|SV* sv
1818 Arranges for sv to be shared between threads if a suitable module
1821 =for apidoc Am|void|SvLOCK|SV* sv
1822 Arranges for a mutual exclusion lock to be obtained on sv if a suitable module
1825 =for apidoc Am|void|SvUNLOCK|SV* sv
1826 Releases a mutual exclusion lock on sv if a suitable module
1829 =head1 SV Manipulation Functions
1831 =for apidoc Am|char *|SvGROW|SV* sv|STRLEN len
1832 Expands the character buffer in the SV so that it has room for the
1833 indicated number of bytes (remember to reserve space for an extra trailing
1834 NUL character). Calls C<sv_grow> to perform the expansion if necessary.
1835 Returns a pointer to the character buffer.
1840 #define SvSHARE(sv) CALL_FPTR(PL_sharehook)(aTHX_ sv)
1841 #define SvLOCK(sv) CALL_FPTR(PL_lockhook)(aTHX_ sv)
1842 #define SvUNLOCK(sv) CALL_FPTR(PL_unlockhook)(aTHX_ sv)
1843 #define SvDESTROYABLE(sv) CALL_FPTR(PL_destroyhook)(aTHX_ sv)
1845 #define SvGETMAGIC(x) STMT_START { if (SvGMAGICAL(x)) mg_get(x); } STMT_END
1846 #define SvSETMAGIC(x) STMT_START { if (SvSMAGICAL(x)) mg_set(x); } STMT_END
1848 #define SvSetSV_and(dst,src,finally) \
1850 if ((dst) != (src)) { \
1851 sv_setsv(dst, src); \
1855 #define SvSetSV_nosteal_and(dst,src,finally) \
1857 if ((dst) != (src)) { \
1858 sv_setsv_flags(dst, src, SV_GMAGIC | SV_NOSTEAL | SV_DO_COW_SVSETSV); \
1863 #define SvSetSV(dst,src) \
1864 SvSetSV_and(dst,src,/*nothing*/;)
1865 #define SvSetSV_nosteal(dst,src) \
1866 SvSetSV_nosteal_and(dst,src,/*nothing*/;)
1868 #define SvSetMagicSV(dst,src) \
1869 SvSetSV_and(dst,src,SvSETMAGIC(dst))
1870 #define SvSetMagicSV_nosteal(dst,src) \
1871 SvSetSV_nosteal_and(dst,src,SvSETMAGIC(dst))
1874 #if !defined(SKIP_DEBUGGING)
1875 #define SvPEEK(sv) sv_peek(sv)
1877 #define SvPEEK(sv) ""
1880 #define SvIMMORTAL(sv) ((sv)==&PL_sv_undef || (sv)==&PL_sv_yes || (sv)==&PL_sv_no || (sv)==&PL_sv_placeholder)
1882 #define boolSV(b) ((b) ? &PL_sv_yes : &PL_sv_no)
1884 #define isGV(sv) (SvTYPE(sv) == SVt_PVGV)
1885 /* If I give every macro argument a different name, then there won't be bugs
1886 where nested macros get confused. Been there, done that. */
1887 #define isGV_with_GP(pwadak) \
1888 (((SvFLAGS(pwadak) & (SVp_POK|SVpgv_GP)) == SVpgv_GP) \
1889 && (SvTYPE(pwadak) == SVt_PVGV || SvTYPE(pwadak) == SVt_PVLV))
1890 #define isGV_with_GP_on(sv) STMT_START { \
1891 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
1892 assert (!SvPOKp(sv)); \
1893 assert (!SvIOKp(sv)); \
1894 (SvFLAGS(sv) |= SVpgv_GP); \
1896 #define isGV_with_GP_off(sv) STMT_START { \
1897 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
1898 assert (!SvPOKp(sv)); \
1899 assert (!SvIOKp(sv)); \
1900 (SvFLAGS(sv) &= ~SVpgv_GP); \
1904 #define SvGROW(sv,len) (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
1905 #define SvGROW_mutable(sv,len) \
1906 (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX_mutable(sv))
1907 #define Sv_Grow sv_grow
1909 #define CLONEf_COPY_STACKS 1
1910 #define CLONEf_KEEP_PTR_TABLE 2
1911 #define CLONEf_CLONE_HOST 4
1912 #define CLONEf_JOIN_IN 8
1914 struct clone_params {
1917 PerlInterpreter *proto_perl;
1921 =for apidoc Am|SV*|newSVpvn_utf8|NULLOK const char* s|STRLEN len|U32 utf8
1923 Creates a new SV and copies a string into it. If utf8 is true, calls
1924 C<SvUTF8_on> on the new SV. Implemented as a wrapper around C<newSVpvn_flags>.
1929 #define newSVpvn_utf8(s, len, u) newSVpvn_flags((s), (len), (u) ? SVf_UTF8 : 0)
1933 * c-indentation-style: bsd
1935 * indent-tabs-mode: t
1938 * ex: set ts=8 sts=4 sw=4 noet: