/* cv.h
*
- * Copyright (c) 1991-1997, Larry Wall
+ * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1999, 2000,
+ * 2001, 2002, 2003, 2004, 2005, 2006, 2007, by Larry Wall and others
*
* 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 the beginning of XPVFM */
+/* This structure must the beginning of XPVFM in sv.h */
struct xpvcv {
- char * xpv_pv; /* pointer to malloced string */
+ union {
+ NV xnv_nv; /* numeric value, if any */
+ HV * xgv_stash;
+ struct {
+ U32 xlow;
+ U32 xhigh;
+ } xpad_cop_seq; /* used by pad.c for cop_sequence */
+ struct {
+ U32 xbm_previous; /* how many characters in string before rare? */
+ U8 xbm_flags;
+ U8 xbm_rare; /* rarest character in string */
+ } xbm_s; /* fields from PVBM */
+ } xnv_u;
STRLEN xpv_cur; /* length of xp_pv as a C string */
STRLEN xpv_len; /* allocated size */
- IV xof_off; /* integer value */
- double xnv_nv; /* numeric value, if any */
- MAGIC* xmg_magic; /* magic for scalar array */
+ union {
+ IV xivu_iv;
+ UV xivu_uv;
+ void * xivu_p1;
+ I32 xivu_i32; /* depth, >= 2 indicates recursive call */
+ HEK * xivu_namehek;
+ } xiv_u;
+ union {
+ MAGIC* xmg_magic; /* linked list of magicalness */
+ HV* xmg_ourstash; /* Stash for our (when SvPAD_OUR is true) */
+ } xmg_u;
HV* xmg_stash; /* class package */
HV * xcv_stash;
- OP * xcv_start;
- OP * xcv_root;
- void (*xcv_xsub) _((CV*));
- ANY xcv_xsubany;
+ union {
+ OP * xcv_start;
+ ANY xcv_xsubany;
+ } xcv_start_u;
+ union {
+ OP * xcv_root;
+ void (*xcv_xsub) (pTHX_ CV*);
+ } xcv_root_u;
GV * xcv_gv;
- GV * xcv_filegv;
- long xcv_depth; /* >= 2 indicates recursive call */
- AV * xcv_padlist;
+ char * xcv_file;
+ PADLIST * xcv_padlist;
CV * xcv_outside;
-#ifdef USE_THREADS
- perl_mutex *xcv_mutexp;
- perl_cond * xcv_condp; /* signalled when owner leaves CV */
- struct thread *xcv_owner; /* current owner thread */
-#endif /* USE_THREADS */
- U8 xcv_flags;
+ U32 xcv_outside_seq; /* the COP sequence (at the point of our
+ * compilation) in the lexically enclosing
+ * sub */
+ cv_flags_t xcv_flags;
};
+typedef struct {
+ STRLEN xpv_cur; /* length of xp_pv as a C string */
+ STRLEN xpv_len; /* allocated size */
+ union {
+ IV xivu_iv;
+ UV xivu_uv;
+ void * xivu_p1;
+ I32 xivu_i32; /* depth, >= 2 indicates recursive call */
+ HEK * xivu_namehek;
+ } xiv_u;
+ union {
+ MAGIC* xmg_magic; /* linked list of magicalness */
+ HV* xmg_ourstash; /* Stash for our (when SvPAD_OUR is true) */
+ } xmg_u;
+ HV* xmg_stash; /* class package */
+
+ HV * xcv_stash;
+ union {
+ OP * xcv_start;
+ ANY xcv_xsubany;
+ } xcv_start_u;
+ union {
+ OP * xcv_root;
+ void (*xcv_xsub) (pTHX_ CV*);
+ } xcv_root_u;
+ GV * xcv_gv;
+ char * xcv_file;
+ PADLIST * xcv_padlist;
+ CV * xcv_outside;
+ U32 xcv_outside_seq; /* the COP sequence (at the point of our
+ * compilation) in the lexically enclosing
+ * sub */
+ cv_flags_t xcv_flags;
+} xpvcv_allocated;
+
+/*
+=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 CvSTART(sv) ((XPVCV*)SvANY(sv))->xcv_start_u.xcv_start
+#define CvROOT(sv) ((XPVCV*)SvANY(sv))->xcv_root_u.xcv_root
+#define CvXSUB(sv) ((XPVCV*)SvANY(sv))->xcv_root_u.xcv_xsub
+#define CvXSUBANY(sv) ((XPVCV*)SvANY(sv))->xcv_start_u.xcv_xsubany
#define CvGV(sv) ((XPVCV*)SvANY(sv))->xcv_gv
-#define CvFILEGV(sv) ((XPVCV*)SvANY(sv))->xcv_filegv
-#define CvDEPTH(sv) ((XPVCV*)SvANY(sv))->xcv_depth
+#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)))
+#if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
+# define CvDEPTH(sv) (*({const CV *_cv = (CV *)sv; \
+ assert(SvTYPE(_cv) == SVt_PVCV || \
+ SvTYPE(_cv) == SVt_PVFM); \
+ &((XPVCV*)SvANY(_cv))->xiv_u.xivu_i32; \
+ }))
+#else
+# define CvDEPTH(sv) ((XPVCV*)SvANY(sv))->xiv_u.xivu_i32
+#endif
#define CvPADLIST(sv) ((XPVCV*)SvANY(sv))->xcv_padlist
#define CvOUTSIDE(sv) ((XPVCV*)SvANY(sv))->xcv_outside
-#ifdef USE_THREADS
-#define CvMUTEXP(sv) ((XPVCV*)SvANY(sv))->xcv_mutexp
-#define CvCONDP(sv) ((XPVCV*)SvANY(sv))->xcv_condp
-#define CvOWNER(sv) ((XPVCV*)SvANY(sv))->xcv_owner
-#endif /* USE_THREADS */
#define CvFLAGS(sv) ((XPVCV*)SvANY(sv))->xcv_flags
+#define CvOUTSIDE_SEQ(sv) ((XPVCV*)SvANY(sv))->xcv_outside_seq
-#define CVf_CLONE 0x01 /* anon CV uses external lexicals */
-#define CVf_CLONED 0x02 /* a clone of one of those */
-#define CVf_ANON 0x04 /* CvGV() can't be trusted */
-#define CVf_OLDSTYLE 0x08
-#define CVf_UNIQUE 0x10 /* can't be cloned */
-#define CVf_NODEBUG 0x20 /* no DB::sub indirection for this CV
+#define CVf_METHOD 0x0001 /* CV is explicitly marked as a method */
+#define CVf_LOCKED 0x0002 /* CV locks itself or first arg on entry */
+#define CVf_LVALUE 0x0004 /* CV return value can be used as lvalue */
+#define CVf_ASSERTION 0x0008 /* CV called only when asserting */
+
+#define CVf_WEAKOUTSIDE 0x0010 /* CvOUTSIDE isn't ref counted */
+#define CVf_CLONE 0x0020 /* anon CV uses external lexicals */
+#define CVf_CLONED 0x0040 /* a clone of one of those */
+#define CVf_ANON 0x0080 /* CvGV() can't be trusted */
+#define CVf_UNIQUE 0x0100 /* sub is only called once (eg PL_main_cv,
+ * require, eval). */
+#define CVf_NODEBUG 0x0200 /* no DB::sub indirection for this CV
(esp. useful for special XSUBs) */
+#define CVf_CONST 0x0400 /* inlinable sub */
+#define CVf_ISXSUB 0x0800 /* CV is an XSUB, not pure perl. */
+
+/* This symbol for optimised communication between toke.c and op.c: */
+#define CVf_BUILTIN_ATTRS (CVf_METHOD|CVf_LOCKED|CVf_LVALUE|CVf_ASSERTION)
#define CvCLONE(cv) (CvFLAGS(cv) & CVf_CLONE)
#define CvCLONE_on(cv) (CvFLAGS(cv) |= CVf_CLONE)
#define CvANON_on(cv) (CvFLAGS(cv) |= CVf_ANON)
#define CvANON_off(cv) (CvFLAGS(cv) &= ~CVf_ANON)
-#define CvOLDSTYLE(cv) (CvFLAGS(cv) & CVf_OLDSTYLE)
-#define CvOLDSTYLE_on(cv) (CvFLAGS(cv) |= CVf_OLDSTYLE)
-#define CvOLDSTYLE_off(cv) (CvFLAGS(cv) &= ~CVf_OLDSTYLE)
-
#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 CvASSERTION(cv) (CvFLAGS(cv) & CVf_ASSERTION)
+#define CvASSERTION_on(cv) (CvFLAGS(cv) |= CVf_ASSERTION)
+#define CvASSERTION_off(cv) (CvFLAGS(cv) &= ~CVf_ASSERTION)
+
+#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|CHECK|INIT|UNITCHECK|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)
+
+#define CvWEAKOUTSIDE(cv) (CvFLAGS(cv) & CVf_WEAKOUTSIDE)
+#define CvWEAKOUTSIDE_on(cv) (CvFLAGS(cv) |= CVf_WEAKOUTSIDE)
+#define CvWEAKOUTSIDE_off(cv) (CvFLAGS(cv) &= ~CVf_WEAKOUTSIDE)
+
+#define CvISXSUB(cv) (CvFLAGS(cv) & CVf_ISXSUB)
+#define CvISXSUB_on(cv) (CvFLAGS(cv) |= CVf_ISXSUB)
+#define CvISXSUB_off(cv) (CvFLAGS(cv) &= ~CVf_ISXSUB)
+
+/* Flags for newXS_flags */
+#define XS_DYNAMIC_FILENAME 0x01 /* The filename isn't static */
+
+/*
+=head1 CV reference counts and CvOUTSIDE
+
+=for apidoc m|bool|CvWEAKOUTSIDE|CV *cv
+
+Each CV has a pointer, C<CvOUTSIDE()>, to its lexically enclosing
+CV (if any). Because pointers to anonymous sub prototypes are
+stored in C<&> pad slots, it is a possible to get a circular reference,
+with the parent pointing to the child and vice-versa. To avoid the
+ensuing memory leak, we do not increment the reference count of the CV
+pointed to by C<CvOUTSIDE> in the I<one specific instance> that the parent
+has a C<&> pad slot pointing back to us. In this case, we set the
+C<CvWEAKOUTSIDE> flag in the child. This allows us to determine under what
+circumstances we should decrement the refcount of the parent when freeing
+the child.
+
+There is a further complication with non-closure anonymous subs (i.e. those
+that do not refer to any lexicals outside that sub). In this case, the
+anonymous prototype is shared rather than being cloned. This has the
+consequence that the parent may be freed while there are still active
+children, eg
+
+ BEGIN { $a = sub { eval '$x' } }
+
+In this case, the BEGIN is freed immediately after execution since there
+are no active references to it: the anon sub prototype has
+C<CvWEAKOUTSIDE> set since it's not a closure, and $a points to the same
+CV, so it doesn't contribute to BEGIN's refcount either. When $a is
+executed, the C<eval '$x'> causes the chain of C<CvOUTSIDE>s to be followed,
+and the freed BEGIN is accessed.
+
+To avoid this, whenever a CV and its associated pad is freed, any
+C<&> entries in the pad are explicitly removed from the pad, and if the
+refcount of the pointed-to anon sub is still positive, then that
+child's C<CvOUTSIDE> is set to point to its grandparent. This will only
+occur in the single specific case of a non-closure anon prototype
+having one or more active references (such as C<$a> above).
+
+One other thing to consider is that a CV may be merely undefined
+rather than freed, eg C<undef &foo>. In this case, its refcount may
+not have reached zero, but we still delete its pad and its C<CvROOT> etc.
+Since various children may still have their C<CvOUTSIDE> pointing at this
+undefined CV, we keep its own C<CvOUTSIDE> for the time being, so that
+the chain of lexical scopes is unbroken. For example, the following
+should print 123:
+
+ my $x = 123;
+ sub tmp { sub { eval '$x' } }
+ my $a = tmp();
+ undef &tmp;
+ print $a->();
+
+=cut
+*/
+
+/*
+ * Local variables:
+ * c-indentation-style: bsd
+ * c-basic-offset: 4
+ * indent-tabs-mode: t
+ * End:
+ *
+ * ex: set ts=8 sts=4 sw=4 noet:
+ */
https://perl5.git.perl.org / perl5.git / blobdiff