An enum of flags for Perl types. These are found in the file B<sv.h>
in the C<svtype> enum. Test these flags with the C<SvTYPE> macro.
-=for apidoc AmU||SVt_PV
-Pointer type flag for scalars. See C<svtype>.
+The types are:
+
+ SVt_NULL
+ SVt_BIND (unused)
+ SVt_IV
+ SVt_NV
+ SVt_RV
+ SVt_PV
+ SVt_PVIV
+ SVt_PVNV
+ SVt_PVMG
+ SVt_REGEXP
+ SVt_PVGV
+ SVt_PVLV
+ SVt_PVAV
+ SVt_PVHV
+ SVt_PVCV
+ SVt_PVFM
+ SVt_PVIO
+
+These are most easily explained from the bottom up.
+
+SVt_PVIO is for I/O objects, SVt_PVFM for formats, SVt_PVCV for
+subroutines, SVt_PVHV for hashes and SVt_PVAV for arrays.
+
+All the others are scalar types, that is, things that can be bound to a
+C<$> variable. For these, the internal types are mostly orthogonal to
+types in the Perl language.
+
+Hence, checking C<< SvTYPE(sv) < SVt_PVAV >> is the best way to see whether
+something is a scalar.
+
+SVt_PVGV represents a typeglob. If !SvFAKE(sv), then it is a real,
+incoercible typeglob. If SvFAKE(sv), then it is a scalar to which a
+typeglob has been assigned. Assigning to it again will stop it from being
+a typeglob. SVt_PVLV represents a scalar that delegates to another scalar
+behind the scenes. It is used, e.g., for the return value of C<substr> and
+for tied hash and array elements. It can hold any scalar value, including
+a typeglob. SVt_REGEXP is for regular expressions.
+
+SVt_PVMG represents a "normal" scalar (not a typeglob, regular expression,
+or delegate). Since most scalars do not need all the internal fields of a
+PVMG, we save memory by allocating smaller structs when possible. All the
+other types are just simpler forms of SVt_PVMG, with fewer internal fields.
+ SVt_NULL can only hold undef. SVt_IV can hold undef, an integer, or a
+reference. (SVt_RV is an alias for SVt_IV, which exists for backward
+compatibility.) SVt_NV can hold any of those or a double. SVt_PV can only
+hold undef or a string. SVt_PVIV is a superset of SVt_PV and SVt_IV.
+SVt_PVNV is similar. SVt_PVMG can hold anything SVt_PVNV can hold, but it
+can, but does not have to, be blessed or magical.
+
+=for apidoc AmU||SVt_NULL
+Type flag for scalars. See L</svtype>.
=for apidoc AmU||SVt_IV
-Integer type flag for scalars. See C<svtype>.
+Type flag for scalars. See L</svtype>.
=for apidoc AmU||SVt_NV
-Double type flag for scalars. See C<svtype>.
+Type flag for scalars. See L</svtype>.
+
+=for apidoc AmU||SVt_PV
+Type flag for scalars. See L</svtype>.
+
+=for apidoc AmU||SVt_PVIV
+Type flag for scalars. See L</svtype>.
+
+=for apidoc AmU||SVt_PVNV
+Type flag for scalars. See L</svtype>.
=for apidoc AmU||SVt_PVMG
-Type flag for blessed scalars. See C<svtype>.
+Type flag for scalars. See L</svtype>.
+
+=for apidoc AmU||SVt_REGEXP
+Type flag for regular expressions. See L</svtype>.
+
+=for apidoc AmU||SVt_PVGV
+Type flag for typeglobs. See L</svtype>.
+
+=for apidoc AmU||SVt_PVLV
+Type flag for scalars. See L</svtype>.
=for apidoc AmU||SVt_PVAV
-Type flag for arrays. See C<svtype>.
+Type flag for arrays. See L</svtype>.
=for apidoc AmU||SVt_PVHV
-Type flag for hashes. See C<svtype>.
+Type flag for hashes. See L</svtype>.
=for apidoc AmU||SVt_PVCV
-Type flag for code refs. See C<svtype>.
+Type flag for subroutines. See L</svtype>.
+
+=for apidoc AmU||SVt_PVFM
+Type flag for formats. See L</svtype>.
+
+=for apidoc AmU||SVt_PVIO
+Type flag for I/O objects. See L</svtype>.
=cut
*/
IV svu_iv; \
UV svu_uv; \
SV* svu_rv; /* pointer to another SV */ \
+ struct regexp* svu_rx; \
SV** svu_array; \
HE** svu_hash; \
GP* svu_gp; \
subroutine in another package. Set the
GvIMPORTED_CV_on() if it needs to be
expanded to a real GV */
-/* 0x00010000 *** FREE SLOT */
+#define SVf_IsCOW 0x00010000 /* copy on write (shared hash key if
+ SvLEN == 0) */
#define SVs_PADTMP 0x00020000 /* in use as tmp; only if ! SVs_PADMY */
#define SVs_PADSTALE 0x00020000 /* lexical has gone out of scope;
only valid for SVs_PADMY */
#define SVf_FAKE 0x01000000 /* 0: glob is just a copy
1: SV head arena wasn't malloc()ed
- 2: in conjunction with SVf_READONLY
- marks a shared hash key scalar
- (SvLEN == 0) or a copy on write
- string (SvLEN != 0) [SvIsCOW(sv)]
- 3: For PVCV, whether CvUNIQUE(cv)
+ 2: For PVCV, whether CvUNIQUE(cv)
refers to an eval or once only
[CvEVAL(cv), CvSPECIAL(cv)]
- 4: On a pad name SV, that slot in the
+ 3: On a pad name SV, that slot in the
frame AV is a REFCNT'ed reference
to a lexical from "outside". */
-#define SVphv_REHASH SVf_FAKE /* 5: On a PVHV, hash values are being
- recalculated */
#define SVf_OOK 0x02000000 /* has valid offset value. For a PVHV this
means that a hv_aux struct is present
after the main array */
-#define SVf_THINKFIRST (SVf_READONLY|SVf_ROK|SVf_FAKE|SVs_RMG)
+#define SVf_THINKFIRST (SVf_READONLY|SVf_ROK|SVf_FAKE|SVs_RMG|SVf_IsCOW)
#define SVf_OK (SVf_IOK|SVf_NOK|SVf_POK|SVf_ROK| \
SVp_IOK|SVp_NOK|SVp_POK|SVpgv_GP)
HV* xmg_stash; /* class package */ \
union _xmgu xmg_u; \
STRLEN xpv_cur; /* length of svu_pv as a C string */ \
- STRLEN xpv_len /* allocated size */
+ union { \
+ STRLEN xpvlenu_len; /* allocated size */ \
+ char * xpvlenu_pv; /* regexp string */ \
+ } xpv_len_u
+
+#define xpv_len xpv_len_u.xpvlenu_len
union _xnvu {
NV xnv_nv; /* numeric value, if any */
#define assert_not_glob(sv) assert_(!isGV_with_GP(sv))
#define SvOK(sv) ((SvTYPE(sv) == SVt_BIND) \
- ? (SvFLAGS(SvRV(sv)) & SVf_OK) \
- : (SvFLAGS(sv) & SVf_OK))
+ ? (SvFLAGS(SvRV(sv)) & SVf_OK \
+ || isREGEXP(SvRV(sv))) \
+ : (SvFLAGS(sv) & SVf_OK \
+ || isREGEXP(sv)))
#define SvOK_off(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
SvFLAGS(sv) &= ~(SVf_OK| \
SVf_IVisUV|SVf_UTF8), \
}))
# define SvCUR(sv) \
(*({ const SV *const _svcur = (const SV *)(sv); \
- assert(PL_valid_types_PVX[SvTYPE(_svcur) & SVt_MASK]); \
+ assert(PL_valid_types_PVX[SvTYPE(_svcur) & SVt_MASK] \
+ || SvTYPE(_svcur) == SVt_REGEXP); \
assert(!isGV_with_GP(_svcur)); \
assert(!(SvTYPE(_svcur) == SVt_PVIO \
&& !(IoFLAGS(_svcur) & IOf_FAKE_DIRP))); \
(((XPVMG*) SvANY(sv))->xmg_stash = (val)); } STMT_END
#define SvCUR_set(sv, val) \
STMT_START { \
- assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
+ assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK] \
+ || SvTYPE(sv) == SVt_REGEXP); \
assert(!isGV_with_GP(sv)); \
assert(!(SvTYPE(sv) == SVt_PVIO \
&& !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
#define sv_taint(sv) sv_magic((sv), NULL, PERL_MAGIC_taint, NULL, 0)
-#define SvTAINTED(sv) (SvMAGICAL(sv) && sv_tainted(sv))
-#define SvTAINTED_on(sv) STMT_START{ if(PL_tainting){sv_taint(sv);} }STMT_END
-#define SvTAINTED_off(sv) STMT_START{ if(PL_tainting){sv_untaint(sv);} }STMT_END
+#if NO_TAINT_SUPPORT
+# define SvTAINTED(sv) 0
+#else
+# define SvTAINTED(sv) (SvMAGICAL(sv) && sv_tainted(sv))
+#endif
+#define SvTAINTED_on(sv) STMT_START{ if(TAINTING_get){sv_taint(sv);} }STMT_END
+#define SvTAINTED_off(sv) STMT_START{ if(TAINTING_get){sv_untaint(sv);} }STMT_END
#define SvTAINT(sv) \
STMT_START { \
- if (PL_tainting) { \
- if (PL_tainted) \
+ if (TAINTING_get) { \
+ if (TAINT_get) \
SvTAINTED_on(sv); \
} \
} STMT_END
#define SvTRUE(sv) ((sv) && (SvGMAGICAL(sv) ? sv_2bool(sv) : SvTRUE_common(sv, sv_2bool_nomg(sv))))
#define SvTRUE_nomg(sv) ((sv) && ( SvTRUE_common(sv, sv_2bool_nomg(sv))))
+#define SvTRUE_NN(sv) (SvGMAGICAL(sv) ? sv_2bool(sv) : SvTRUE_common(sv, sv_2bool_nomg(sv)))
+#define SvTRUE_nomg_NN(sv) ( SvTRUE_common(sv, sv_2bool_nomg(sv)))
#define SvTRUE_common(sv,fallback) ( \
!SvOK(sv) \
? 0 \
# define SvPVbytex_nolen(sv) ({SV *_sv = (sv); SvPVbyte_nolen(_sv); })
# define SvTRUEx(sv) ({SV *_sv = (sv); SvTRUE(_sv); })
# define SvTRUEx_nomg(sv) ({SV *_sv = (sv); SvTRUE_nomg(_sv); })
-# define SvPVXtrue(sv) \
- ({XPV *nxpv; \
- (nxpv = (XPV*)SvANY(sv)) \
- && (nxpv->xpv_cur > 1 \
- || (nxpv->xpv_cur && *(sv)->sv_u.svu_pv != '0'));})
#else /* __GNUC__ */
# define SvPVbytex_nolen(sv) ((PL_Sv = (sv)), SvPVbyte_nolen(PL_Sv))
# define SvTRUEx(sv) ((PL_Sv = (sv)), SvTRUE(PL_Sv))
# define SvTRUEx_nomg(sv) ((PL_Sv = (sv)), SvTRUE_nomg(PL_Sv))
-# define SvPVXtrue(sv) \
- ((PL_Xpv = (XPV*)SvANY(PL_Sv = (sv))) \
- && (PL_Xpv->xpv_cur > 1 \
- || (PL_Xpv->xpv_cur && *PL_Sv->sv_u.svu_pv != '0')))
#endif /* __GNU__ */
-#define SvIsCOW(sv) ((SvFLAGS(sv) & (SVf_FAKE | SVf_READONLY)) == \
- (SVf_FAKE | SVf_READONLY) && !isGV_with_GP(sv) \
- && SvTYPE(sv) != SVt_REGEXP)
+#define SvPVXtrue(sv) ( \
+ ((XPV*)SvANY((sv))) \
+ && ( \
+ ((XPV*)SvANY((sv)))->xpv_cur > 1 \
+ || ( \
+ ((XPV*)SvANY((sv)))->xpv_cur \
+ && *(sv)->sv_u.svu_pv != '0' \
+ ) \
+ ) \
+)
+
+#define SvIsCOW(sv) (SvFLAGS(sv) & SVf_IsCOW)
+#define SvIsCOW_on(sv) (SvFLAGS(sv) |= SVf_IsCOW)
+#define SvIsCOW_off(sv) (SvFLAGS(sv) &= ~SVf_IsCOW)
#define SvIsCOW_shared_hash(sv) (SvIsCOW(sv) && SvLEN(sv) == 0)
#define SvSHARED_HEK_FROM_PV(pvx) \
#define sv_insert(bigstr, offset, len, little, littlelen) \
Perl_sv_insert_flags(aTHX_ (bigstr),(offset), (len), (little), \
(littlelen), SV_GMAGIC)
+#define sv_mortalcopy(sv) \
+ Perl_sv_mortalcopy_flags(aTHX_ sv, SV_GMAGIC|SV_DO_COW_SVSETSV)
/* Should be named SvCatPVN_utf8_upgrade? */
#define sv_catpvn_nomg_utf8_upgrade(dsv, sstr, slen, nsv) \
sv_utf8_upgrade(nsv); \
sv_catsv_nomg(dsv, nsv); \
} STMT_END
+#define sv_catpvn_nomg_maybeutf8(dsv, sstr, slen, is_utf8) \
+ sv_catpvn_flags(dsv, sstr, slen, (is_utf8)?SV_CATUTF8:SV_CATBYTES)
#ifdef PERL_CORE
# define sv_or_pv_len_utf8(sv, pv, bytelen) \
assert (!SvIOKp(sv)); \
(SvFLAGS(sv) &= ~SVpgv_GP); \
} STMT_END
+#define isREGEXP(sv) \
+ (SvTYPE(sv) == SVt_REGEXP \
+ || (SvFLAGS(sv) & (SVTYPEMASK|SVp_POK|SVpgv_GP|SVf_FAKE)) \
+ == (SVt_PVLV|SVf_FAKE))
#define SvGROW(sv,len) (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
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