+#define isLEXWARN_on (PL_curcop->cop_warnings != pWARN_STD)
+#define isLEXWARN_off (PL_curcop->cop_warnings == pWARN_STD)
+#define isWARN_ONCE (PL_dowarn & (G_WARN_ON|G_WARN_ONCE))
+#define isWARN_on(c,x) (IsSet(SvPVX(c), 2*(x)))
+#define isWARNf_on(c,x) (IsSet(SvPVX(c), 2*(x)+1))
+
+#define ckWARN(x) \
+ ( (isLEXWARN_on && PL_curcop->cop_warnings != pWARN_NONE && \
+ (PL_curcop->cop_warnings == pWARN_ALL || \
+ isWARN_on(PL_curcop->cop_warnings, x) ) ) \
+ || (isLEXWARN_off && PL_dowarn & G_WARN_ON) )
+
+#define ckWARN2(x,y) \
+ ( (isLEXWARN_on && PL_curcop->cop_warnings != pWARN_NONE && \
+ (PL_curcop->cop_warnings == pWARN_ALL || \
+ isWARN_on(PL_curcop->cop_warnings, x) || \
+ isWARN_on(PL_curcop->cop_warnings, y) ) ) \
+ || (isLEXWARN_off && PL_dowarn & G_WARN_ON) )
+
+#define ckWARN3(x,y,z) \
+ ( (isLEXWARN_on && PL_curcop->cop_warnings != pWARN_NONE && \
+ (PL_curcop->cop_warnings == pWARN_ALL || \
+ isWARN_on(PL_curcop->cop_warnings, x) || \
+ isWARN_on(PL_curcop->cop_warnings, y) || \
+ isWARN_on(PL_curcop->cop_warnings, z) ) ) \
+ || (isLEXWARN_off && PL_dowarn & G_WARN_ON) )
+
+#define ckWARN4(x,y,z,t) \
+ ( (isLEXWARN_on && PL_curcop->cop_warnings != pWARN_NONE && \
+ (PL_curcop->cop_warnings == pWARN_ALL || \
+ isWARN_on(PL_curcop->cop_warnings, x) || \
+ isWARN_on(PL_curcop->cop_warnings, y) || \
+ isWARN_on(PL_curcop->cop_warnings, z) || \
+ isWARN_on(PL_curcop->cop_warnings, t) ) ) \
+ || (isLEXWARN_off && PL_dowarn & G_WARN_ON) )
+
+#define ckWARN_d(x) \
+ (isLEXWARN_off || PL_curcop->cop_warnings == pWARN_ALL || \
+ (PL_curcop->cop_warnings != pWARN_NONE && \
+ isWARN_on(PL_curcop->cop_warnings, x) ) )
+
+#define ckWARN2_d(x,y) \
+ (isLEXWARN_off || PL_curcop->cop_warnings == pWARN_ALL || \
+ (PL_curcop->cop_warnings != pWARN_NONE && \
+ (isWARN_on(PL_curcop->cop_warnings, x) || \
+ isWARN_on(PL_curcop->cop_warnings, y) ) ) )
+
+#define ckWARN3_d(x,y,z) \
+ (isLEXWARN_off || PL_curcop->cop_warnings == pWARN_ALL || \
+ (PL_curcop->cop_warnings != pWARN_NONE && \
+ (isWARN_on(PL_curcop->cop_warnings, x) || \
+ isWARN_on(PL_curcop->cop_warnings, y) || \
+ isWARN_on(PL_curcop->cop_warnings, z) ) ) )
+
+#define ckWARN4_d(x,y,z,t) \
+ (isLEXWARN_off || PL_curcop->cop_warnings == pWARN_ALL || \
+ (PL_curcop->cop_warnings != pWARN_NONE && \
+ (isWARN_on(PL_curcop->cop_warnings, x) || \
+ isWARN_on(PL_curcop->cop_warnings, y) || \
+ isWARN_on(PL_curcop->cop_warnings, z) || \
+ isWARN_on(PL_curcop->cop_warnings, t) ) ) )
+
+#define packWARN(a) (a )
+#define packWARN2(a,b) ((a) | (b)<<8 )
+#define packWARN3(a,b,c) ((a) | (b)<<8 | (c) <<16 )
+#define packWARN4(a,b,c,d) ((a) | (b)<<8 | (c) <<16 | (d) <<24)
+
+#define unpackWARN1(x) ((x) & 0xFF)
+#define unpackWARN2(x) (((x) >>8) & 0xFF)
+#define unpackWARN3(x) (((x) >>16) & 0xFF)
+#define unpackWARN4(x) (((x) >>24) & 0xFF)
+
+#define ckDEAD(x) \
+ ( ! specialWARN(PL_curcop->cop_warnings) && \
+ ( isWARNf_on(PL_curcop->cop_warnings, WARN_ALL) || \
+ isWARNf_on(PL_curcop->cop_warnings, unpackWARN1(x)) || \
+ isWARNf_on(PL_curcop->cop_warnings, unpackWARN2(x)) || \
+ isWARNf_on(PL_curcop->cop_warnings, unpackWARN3(x)) || \
+ isWARNf_on(PL_curcop->cop_warnings, unpackWARN4(x))))
+