X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/a0d0e21ea6ea90a22318550944fe6cb09ae10cda..9061a8f72941979d02cbccb5cb18a2034813b6a7:/av.h

diff --git a/av.h b/av.h
index 082a8ab..5231c4d 100644
--- a/av.h
+++ b/av.h
@@ -1,6 +1,7 @@
 /*    av.h
  *
- *    Copyright (c) 1991-1994, Larry Wall
+ *    Copyright (C) 1991, 1992, 1993, 1995, 1996, 1997, 1998, 1999, 2000,
+ *    2001, 2002, 2005, 2006, 2007, 2008, 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.
@@ -8,37 +9,91 @@
  */
 
 struct xpvav {
-    char*	xav_array;	/* pointer to malloced string */
-    SSize_t	xav_fill;
-    SSize_t	xav_max;
-    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;
-    SV*		xav_arylen;
-    U8		xav_flags;
+    union _xmgu	xmg_u;
+    SSize_t	xav_fill;       /* Index of last element present */
+    SSize_t	xav_max;        /* max index for which array has space */
+    SV**	xav_alloc;	/* pointer to beginning of C array of SVs */
 };
 
-#define AVf_REAL 1	/* free old entries */
-#define AVf_REIFY 2	/* can become real */
+/* 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)
+=cut
+*/
+
+#ifndef PERL_CORE
+#  define Nullav Null(AV*)
+#endif
+
+#define AvARRAY(av)	((av)->sv_u.svu_array)
 #define AvALLOC(av)	((XPVAV*)  SvANY(av))->xav_alloc
 #define AvMAX(av)	((XPVAV*)  SvANY(av))->xav_max
-#define AvFILL(av)	((XPVAV*)  SvANY(av))->xav_fill
-#define AvARYLEN(av)	((XPVAV*)  SvANY(av))->xav_arylen
-#define AvFLAGS(av)	((XPVAV*)  SvANY(av))->xav_flags
+#define AvFILLp(av)	((XPVAV*)  SvANY(av))->xav_fill
+#define AvARYLEN(av)	(*Perl_av_arylen_p(aTHX_ MUTABLE_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((const SV *) (av))) \
+			 ? mg_size(MUTABLE_SV(av)) : AvFILLp(av))
+
+#define NEGATIVE_INDICES_VAR "NEGATIVE_INDICES"
 
-#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)
+/*
+=for apidoc newAV
 
-#define AvREALISH(av)	AvFLAGS(av)	/* REAL or REIFY -- shortcut */
+Creates a new AV.  The reference count is set to 1.
 
+=cut
+*/
+
+#define newAV()	MUTABLE_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:
+ */