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- /* cv.h
- *
- * Copyright (c) 1991-2002, Larry Wall
- *
- * You may distribute under the terms of either the GNU General Public
- * License or the Artistic License, as specified in the README file.
- *
- */
-
- /* This structure much match XPVCV in B/C.pm and the beginning of XPVFM
- * in sv.h */
-
- struct xpvcv {
- char * xpv_pv; /* pointer to malloced string */
- STRLEN xpv_cur; /* length of xp_pv as a C string */
- STRLEN xpv_len; /* allocated size */
- IV xof_off; /* integer value */
- NV xnv_nv; /* numeric value, if any */
- MAGIC* xmg_magic; /* magic for scalar array */
- HV* xmg_stash; /* class package */
-
- HV * xcv_stash;
- OP * xcv_start;
- OP * xcv_root;
- void (*xcv_xsub) (pTHX_ CV*);
- ANY xcv_xsubany;
- GV * xcv_gv;
- char * xcv_file;
- long xcv_depth; /* >= 2 indicates recursive call */
- AV * xcv_padlist;
- CV * xcv_outside;
- #ifdef USE_5005THREADS
- perl_mutex *xcv_mutexp;
- struct perl_thread *xcv_owner; /* current owner thread */
- #endif /* USE_5005THREADS */
- cv_flags_t xcv_flags;
- };
-
- /*
- =head1 Handy Values
-
- =for apidoc AmU||Nullcv
- Null CV pointer.
-
- =head1 CV Manipulation Functions
-
- =for apidoc Am|HV*|CvSTASH|CV* cv
- Returns the stash of the CV.
-
- =cut
- */
-
- #define Nullcv Null(CV*)
-
- #define CvSTASH(sv) ((XPVCV*)SvANY(sv))->xcv_stash
- #define CvSTART(sv) ((XPVCV*)SvANY(sv))->xcv_start
- #define CvROOT(sv) ((XPVCV*)SvANY(sv))->xcv_root
- #define CvXSUB(sv) ((XPVCV*)SvANY(sv))->xcv_xsub
- #define CvXSUBANY(sv) ((XPVCV*)SvANY(sv))->xcv_xsubany
- #define CvGV(sv) ((XPVCV*)SvANY(sv))->xcv_gv
- #define CvFILE(sv) ((XPVCV*)SvANY(sv))->xcv_file
- #ifdef USE_ITHREADS
- # define CvFILE_set_from_cop(sv, cop) (CvFILE(sv) = savepv(CopFILE(cop)))
- #else
- # define CvFILE_set_from_cop(sv, cop) (CvFILE(sv) = CopFILE(cop))
- #endif
- #define CvFILEGV(sv) (gv_fetchfile(CvFILE(sv)))
- #define CvDEPTH(sv) ((XPVCV*)SvANY(sv))->xcv_depth
- #define CvPADLIST(sv) ((XPVCV*)SvANY(sv))->xcv_padlist
- #define CvOUTSIDE(sv) ((XPVCV*)SvANY(sv))->xcv_outside
- #ifdef USE_5005THREADS
- #define CvMUTEXP(sv) ((XPVCV*)SvANY(sv))->xcv_mutexp
- #define CvOWNER(sv) ((XPVCV*)SvANY(sv))->xcv_owner
- #endif /* USE_5005THREADS */
- #define CvFLAGS(sv) ((XPVCV*)SvANY(sv))->xcv_flags
-
- #define CVf_CLONE 0x0001 /* anon CV uses external lexicals */
- #define CVf_CLONED 0x0002 /* a clone of one of those */
- #define CVf_ANON 0x0004 /* CvGV() can't be trusted */
- #define CVf_OLDSTYLE 0x0008
- #define CVf_UNIQUE 0x0010 /* can't be cloned */
- #define CVf_NODEBUG 0x0020 /* no DB::sub indirection for this CV
- (esp. useful for special XSUBs) */
- #define CVf_METHOD 0x0040 /* CV is explicitly marked as a method */
- #define CVf_LOCKED 0x0080 /* CV locks itself or first arg on entry */
- #define CVf_LVALUE 0x0100 /* CV return value can be used as lvalue */
- #define CVf_CONST 0x0200 /* inlinable sub */
- /* This symbol for optimised communication between toke.c and op.c: */
- #define CVf_BUILTIN_ATTRS (CVf_METHOD|CVf_LOCKED|CVf_LVALUE)
-
- #define CvCLONE(cv) (CvFLAGS(cv) & CVf_CLONE)
- #define CvCLONE_on(cv) (CvFLAGS(cv) |= CVf_CLONE)
- #define CvCLONE_off(cv) (CvFLAGS(cv) &= ~CVf_CLONE)
-
- #define CvCLONED(cv) (CvFLAGS(cv) & CVf_CLONED)
- #define CvCLONED_on(cv) (CvFLAGS(cv) |= CVf_CLONED)
- #define CvCLONED_off(cv) (CvFLAGS(cv) &= ~CVf_CLONED)
-
- #define CvANON(cv) (CvFLAGS(cv) & CVf_ANON)
- #define CvANON_on(cv) (CvFLAGS(cv) |= CVf_ANON)
- #define CvANON_off(cv) (CvFLAGS(cv) &= ~CVf_ANON)
-
- #ifdef PERL_XSUB_OLDSTYLE
- #define CvOLDSTYLE(cv) (CvFLAGS(cv) & CVf_OLDSTYLE)
- #define CvOLDSTYLE_on(cv) (CvFLAGS(cv) |= CVf_OLDSTYLE)
- #define CvOLDSTYLE_off(cv) (CvFLAGS(cv) &= ~CVf_OLDSTYLE)
- #endif
-
- #define CvUNIQUE(cv) (CvFLAGS(cv) & CVf_UNIQUE)
- #define CvUNIQUE_on(cv) (CvFLAGS(cv) |= CVf_UNIQUE)
- #define CvUNIQUE_off(cv) (CvFLAGS(cv) &= ~CVf_UNIQUE)
-
- #define CvNODEBUG(cv) (CvFLAGS(cv) & CVf_NODEBUG)
- #define CvNODEBUG_on(cv) (CvFLAGS(cv) |= CVf_NODEBUG)
- #define CvNODEBUG_off(cv) (CvFLAGS(cv) &= ~CVf_NODEBUG)
-
- #define CvMETHOD(cv) (CvFLAGS(cv) & CVf_METHOD)
- #define CvMETHOD_on(cv) (CvFLAGS(cv) |= CVf_METHOD)
- #define CvMETHOD_off(cv) (CvFLAGS(cv) &= ~CVf_METHOD)
-
- #define CvLOCKED(cv) (CvFLAGS(cv) & CVf_LOCKED)
- #define CvLOCKED_on(cv) (CvFLAGS(cv) |= CVf_LOCKED)
- #define CvLOCKED_off(cv) (CvFLAGS(cv) &= ~CVf_LOCKED)
-
- #define CvLVALUE(cv) (CvFLAGS(cv) & CVf_LVALUE)
- #define CvLVALUE_on(cv) (CvFLAGS(cv) |= CVf_LVALUE)
- #define CvLVALUE_off(cv) (CvFLAGS(cv) &= ~CVf_LVALUE)
-
- #define CvEVAL(cv) (CvUNIQUE(cv) && !SvFAKE(cv))
- #define CvEVAL_on(cv) (CvUNIQUE_on(cv),SvFAKE_off(cv))
- #define CvEVAL_off(cv) CvUNIQUE_off(cv)
-
- /* BEGIN|INIT|END */
- #define CvSPECIAL(cv) (CvUNIQUE(cv) && SvFAKE(cv))
- #define CvSPECIAL_on(cv) (CvUNIQUE_on(cv),SvFAKE_on(cv))
- #define CvSPECIAL_off(cv) (CvUNIQUE_off(cv),SvFAKE_off(cv))
-
- #define CvCONST(cv) (CvFLAGS(cv) & CVf_CONST)
- #define CvCONST_on(cv) (CvFLAGS(cv) |= CVf_CONST)
- #define CvCONST_off(cv) (CvFLAGS(cv) &= ~CVf_CONST)
-
- /*
- =head1 Pad Data Structures
-
- =for apidoc m|AV *|CvPADLIST|CV *cv
- CV's can have CvPADLIST(cv) set to point to an AV.
-
- For these purposes "forms" are a kind-of CV, eval""s are too (except they're
- not callable at will and are always thrown away after the eval"" is done
- executing).
-
- XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad,
- but that is really the callers pad (a slot of which is allocated by
- every entersub).
-
- The CvPADLIST AV has does not have AvREAL set, so REFCNT of component items
- is managed "manual" (mostly in op.c) rather than normal av.c rules.
- The items in the AV are not SVs as for a normal AV, but other AVs:
-
- 0'th Entry of the CvPADLIST is an AV which represents the "names" or rather
- the "static type information" for lexicals.
-
- The CvDEPTH'th entry of CvPADLIST AV is an AV which is the stack frame at that
- depth of recursion into the CV.
- The 0'th slot of a frame AV is an AV which is @_.
- other entries are storage for variables and op targets.
-
- During compilation:
- C<PL_comppad_name> is set the the the names AV.
- C<PL_comppad> is set the the frame AV for the frame CvDEPTH == 1.
- C<PL_curpad> is set the body of the frame AV (i.e. AvARRAY(PL_comppad)).
-
- Itterating over the names AV itterates over all possible pad
- items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having
- &PL_sv_undef "names" (see pad_alloc()).
-
- Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names.
- The rest are op targets/GVs/constants which are statically allocated
- or resolved at compile time. These don't have names by which they
- can be looked up from Perl code at run time through eval"" like
- my/our variables can be. Since they can't be looked up by "name"
- but only by their index allocated at compile time (which is usually
- in PL_op->op_targ), wasting a name SV for them doesn't make sense.
-
- The SVs in the names AV have their PV being the name of the variable.
- NV+1..IV inclusive is a range of cop_seq numbers for which the name is valid.
- For typed lexicals name SV is SVt_PVMG and SvSTASH points at the type.
-
- If SvFAKE is set on the name SV then slot in the frame AVs are
- a REFCNT'ed references to a lexical from "outside".
-
- If the 'name' is '&' the the corresponding entry in frame AV
- is a CV representing a possible closure.
- (SvFAKE and name of '&' is not a meaningful combination currently but could
- become so if C<my sub foo {}> is implemented.)
-
- =cut
- */
-
-