X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/a60c0954410db87be540ee8439afcd54350bbb8e..4f58fed66d9db68b8f40235b5d930c67f7aff64e:/av.h

diff --git a/av.h b/av.h
index 8de81f4..8874045 100644
--- a/av.h
+++ b/av.h
@@ -1,51 +1,114 @@
 /*    av.h
  *
- *    Copyright (c) 1991-1998, Larry Wall
+ *    Copyright (C) 1991, 1992, 1993, 1995, 1996, 1997, 1998, 1999,
+ *    2000, 2001, 2002, 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.
  *
  */
 
+#define _XPVAV_ALLOCATED_HEAD						\
+    SSize_t	xav_fill;       /* Index of last element present */	\
+    SSize_t	xav_max         /* max index for which array has space */
+
+#define _XPVAV_HEAD	\
+    union _xnvu xnv_u;	\
+    _XPVAV_ALLOCATED_HEAD
+
 struct xpvav {
-    char*	xav_array;      /* pointer to first array element */
-    SSize_t	xav_fill;       /* Index of last element present */
-    SSize_t	xav_max;        /* Number of elements for which array has space */
-    IV		xof_off;	/* ptr is incremented by offset */
-    double	xnv_nv;		/* numeric value, if any */
-    MAGIC*	xmg_magic;	/* magic for scalar array */
-    HV*		xmg_stash;	/* class package */
-
-    SV**	xav_alloc;	/* pointer to malloced string */
-    SV*		xav_arylen;
-    U8		xav_flags;
+    _XPVAV_HEAD;
+    _XPVMG_HEAD;
 };
 
-#define AVf_REAL 1	/* free old entries */
-#define AVf_REIFY 2	/* can become real */
-#define AVf_REUSED 4	/* got undeffed--don't turn old memory into SVs now */
+typedef struct {
+    _XPVAV_ALLOCATED_HEAD;
+    _XPVMG_HEAD;
+} xpvav_allocated;
+
+#undef _XPVAV_ALLOCATED_HEAD
+#undef _XPVAV_HEAD
+
+/* SV**	xav_alloc; */
+#define xav_alloc xiv_u.xivu_p1
+/* SV*	xav_arylen; */
+
+/* SVpav_REAL is set for all AVs whose xav_array contents are refcounted.
+ * Some things like "@_" and the scratchpad list do not set this, to
+ * indicate that they are cheating (for efficiency) by not refcounting
+ * the AV's contents.
+ * 
+ * SVpav_REIFY is only meaningful on such "fake" AVs (i.e. where SVpav_REAL
+ * is not set).  It indicates that the fake AV is capable of becoming
+ * real if the array needs to be modified in some way.  Functions that
+ * modify fake AVs check both flags to call av_reify() as appropriate.
+ *
+ * Note that the Perl stack and @DB::args have neither flag set. (Thus,
+ * items that go on the stack are never refcounted.)
+ *
+ * These internal details are subject to change any time.  AV
+ * manipulations external to perl should not care about any of this.
+ * GSAR 1999-09-10
+ */
+
+/*
+=head1 Handy Values
+
+=for apidoc AmU||Nullav
+Null AV pointer.
+
+(deprecated - use C<(AV *)NULL> instead)
+
+=head1 Array Manipulation Functions
 
-#define Nullav Null(AV*)
+=for apidoc Am|int|AvFILL|AV* av
+Same as C<av_len()>.  Deprecated, use C<av_len()> instead.
 
-#define AvARRAY(av)	((SV**)((XPVAV*)  SvANY(av))->xav_array)
-#define AvALLOC(av)	((XPVAV*)  SvANY(av))->xav_alloc
+=cut
+*/
+
+#ifndef PERL_CORE
+#  define Nullav Null(AV*)
+#endif
+
+#define AvARRAY(av)	((av)->sv_u.svu_array)
+#define AvALLOC(av)	(*((SV***)&((XPVAV*)  SvANY(av))->xav_alloc))
 #define AvMAX(av)	((XPVAV*)  SvANY(av))->xav_max
 #define AvFILLp(av)	((XPVAV*)  SvANY(av))->xav_fill
-#define AvARYLEN(av)	((XPVAV*)  SvANY(av))->xav_arylen
-#define AvFLAGS(av)	((XPVAV*)  SvANY(av))->xav_flags
-
-#define AvREAL(av)	(AvFLAGS(av) & AVf_REAL)
-#define AvREAL_on(av)	(AvFLAGS(av) |= AVf_REAL)
-#define AvREAL_off(av)	(AvFLAGS(av) &= ~AVf_REAL)
-#define AvREIFY(av)	(AvFLAGS(av) & AVf_REIFY)
-#define AvREIFY_on(av)	(AvFLAGS(av) |= AVf_REIFY)
-#define AvREIFY_off(av)	(AvFLAGS(av) &= ~AVf_REIFY)
-#define AvREUSED(av)	(AvFLAGS(av) & AVf_REUSED)
-#define AvREUSED_on(av)	(AvFLAGS(av) |= AVf_REUSED)
-#define AvREUSED_off(av) (AvFLAGS(av) &= ~AVf_REUSED)
-
-#define AvREALISH(av)	(AvFLAGS(av) & (AVf_REAL|AVf_REIFY))
+#define AvARYLEN(av)	(*Perl_av_arylen_p(aTHX_ (AV*)av))
+
+#define AvREAL(av)	(SvFLAGS(av) & SVpav_REAL)
+#define AvREAL_on(av)	(SvFLAGS(av) |= SVpav_REAL)
+#define AvREAL_off(av)	(SvFLAGS(av) &= ~SVpav_REAL)
+#define AvREAL_only(av)	(AvREIFY_off(av), SvFLAGS(av) |= SVpav_REAL)
+#define AvREIFY(av)	(SvFLAGS(av) & SVpav_REIFY)
+#define AvREIFY_on(av)	(SvFLAGS(av) |= SVpav_REIFY)
+#define AvREIFY_off(av)	(SvFLAGS(av) &= ~SVpav_REIFY)
+#define AvREIFY_only(av)	(AvREAL_off(av), SvFLAGS(av) |= SVpav_REIFY)
+
+#define AvREALISH(av)	(SvFLAGS(av) & (SVpav_REAL|SVpav_REIFY))
                                           
 #define AvFILL(av)	((SvRMAGICAL((SV *) (av))) \
 			  ? mg_size((SV *) av) : AvFILLp(av))
 
+#define NEGATIVE_INDICES_VAR "NEGATIVE_INDICES"
+
+/*
+=for apidoc newAV
+
+Creates a new AV.  The reference count is set to 1.
+
+=cut
+*/
+
+#define newAV()	((AV *)newSV_type(SVt_PVAV))
+
+/*
+ * Local variables:
+ * c-indentation-style: bsd
+ * c-basic-offset: 4
+ * indent-tabs-mode: t
+ * End:
+ *
+ * ex: set ts=8 sts=4 sw=4 noet:
+ */