+#ifdef EAGER_BLACKHOLING
+# ifdef SMP
+# define UPD_BH_UPDATABLE(info) \
+ TICK_UPD_BH_UPDATABLE(); \
+ { \
+ bdescr *bd = Bdescr(R1.p); \
+ if (bd->u.back != (bdescr *)BaseReg) { \
+ if (bd->gen_no >= 1 || bd->step->no >= 1) { \
+ LOCK_THUNK(info); \
+ } else { \
+ EXTFUN_RTS(stg_gc_enter_1_hponly); \
+ JMP_(stg_gc_enter_1_hponly); \
+ } \
+ } \
+ } \
+ SET_INFO(R1.cl,&stg_BLACKHOLE_info)
+# define UPD_BH_SINGLE_ENTRY(info) \
+ TICK_UPD_BH_SINGLE_ENTRY(); \
+ { \
+ bdescr *bd = Bdescr(R1.p); \
+ if (bd->u.back != (bdescr *)BaseReg) { \
+ if (bd->gen_no >= 1 || bd->step->no >= 1) { \
+ LOCK_THUNK(info); \
+ } else { \
+ EXTFUN_RTS(stg_gc_enter_1_hponly); \
+ JMP_(stg_gc_enter_1_hponly); \
+ } \
+ } \
+ } \
+ SET_INFO(R1.cl,&stg_BLACKHOLE_info)
+# else
+# ifndef PROFILING
+# define UPD_BH_UPDATABLE(info) \
+ TICK_UPD_BH_UPDATABLE(); \
+ SET_INFO(R1.cl,&stg_BLACKHOLE_info)
+# define UPD_BH_SINGLE_ENTRY(info) \
+ TICK_UPD_BH_SINGLE_ENTRY(); \
+ SET_INFO(R1.cl,&stg_SE_BLACKHOLE_info)
+# else
+// An object is replaced by a blackhole, so we fill the slop with zeros.
+//
+// Todo: maybe use SET_HDR() and remove LDV_recordCreate()?
+//
+# define UPD_BH_UPDATABLE(info) \
+ TICK_UPD_BH_UPDATABLE(); \
+ LDV_recordDead_FILL_SLOP_DYNAMIC(R1.cl); \
+ SET_INFO(R1.cl,&stg_BLACKHOLE_info); \
+ LDV_recordCreate(R1.cl)
+# define UPD_BH_SINGLE_ENTRY(info) \
+ TICK_UPD_BH_SINGLE_ENTRY(); \
+ LDV_recordDead_FILL_SLOP_DYNAMIC(R1.cl); \
+ SET_INFO(R1.cl,&stg_SE_BLACKHOLE_info) \
+ LDV_recordCreate(R1.cl)
+# endif /* PROFILING */
+# endif
+#else /* !EAGER_BLACKHOLING */
+# define UPD_BH_UPDATABLE(thunk) /* nothing */
+# define UPD_BH_SINGLE_ENTRY(thunk) /* nothing */
+#endif /* EAGER_BLACKHOLING */
+
+#define UPD_FRAME_UPDATEE(p) ((P_)(((StgUpdateFrame *)(p))->updatee))
+#define UPDATE_SU_FROM_UPD_FRAME(p) (Su=((StgUpdateFrame *)(p))->link)