Add a depth field to formats

Instead of lengthening the struct, we can reuse SvCUR, which is cur-
rently unused.

1 files changed, 6 insertions, 1 deletions

diff --git a/sv.h b/sv.h
index b2385d0a6d..4c9bc55e92 100644
--- a/sv.h
+++ b/sv.h
@@ -415,9 +415,14 @@ perform the upgrade if necessary.  See C<svtype>.
 #define _XPV_HEAD							\
     HV*		xmg_stash;	/* class package */			\
     union _xmgu	xmg_u;							\
-    STRLEN	xpv_cur;	/* length of svu_pv as a C string */    \
+    union {								\
+	STRLEN	xpvcuru_cur;	/* length of svu_pv as a C string */    \
+	I32	xpvcuru_fmdepth;					\
+    }		xpv_cur_u;						\
     STRLEN	xpv_len 	/* allocated size */
 
+#define xpv_cur	xpv_cur_u.xpvcuru_cur
+
 union _xnvu {
     NV	    xnv_nv;		/* numeric value, if any */
     HV *    xgv_stash;