Propagate const/mutable/not into the SvPV call for retrieving an

[p5sagit/p5-mst-13.2.git] / perl.h

diff --git a/perl.h b/perl.h
index 71d8180..5eff7de 100644 (file)
--- a/perl.h
+++ b/perl.h
@@ -1495,6 +1495,19 @@ typedef UVTYPE UV;
 #  define PTR2ul(p)    INT2PTR(unsigned long,p)        
 #endif
 
+/* According to strict ANSI C89 one cannot freely cast between
+ * data pointers and function (code) pointers.  There are at least
+ * two ways around this.  One (used below) is to do two casts,
+ * first the other pointer to an (unsigned) integer, and then
+ * the integer to the other pointer.  The other way would be
+ * to use unions to "overlay" the pointers.  For an example of
+ * the latter technique, see union dirpu in struct xpvio in sv.h.
+ * The only feasible use is probably temporarily storing
+ * function pointers in a data pointer (such as a void pointer). */
+
+#define DPTR2FPTR(t,p) ((t)PTR2UV(p)) /* data pointer to function pointer */
+#define FPTR2DPTR(t,p) ((t)PTR2UV(p)) /* function pointer to data pointer */
+
 #ifdef USE_LONG_DOUBLE
 #  if defined(HAS_LONG_DOUBLE) && LONG_DOUBLESIZE == DOUBLESIZE
 #      define LONG_DOUBLE_EQUALS_DOUBLE
@@ -3792,7 +3805,8 @@ enum {            /* pass one of these to get_vtbl */
     want_vtbl_regdatum,
     want_vtbl_backref,
     want_vtbl_utf8,
-    want_vtbl_symtab
+    want_vtbl_symtab,
+    want_vtbl_arylen_p
 };
 
                                /* Note: the lowest 8 bits are reserved for
@@ -4152,6 +4166,17 @@ MGVTBL_SET(
 );
 
 MGVTBL_SET(
+    PL_vtbl_arylen_p,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    MEMBER_TO_FPTR(Perl_magic_freearylen_p),
+    NULL,
+    NULL
+);
+
+MGVTBL_SET(
     PL_vtbl_glob,
     MEMBER_TO_FPTR(Perl_magic_getglob),
     MEMBER_TO_FPTR(Perl_magic_setglob),