rts: Remove bitrotten retainer debug code

The `defined(DEBUG_RETAINER) == true` branch doesn't even compile anymore
because 1) retainerSet was renamed to RetainerSet and 2) even if I fix that
the context in Rts.h seems to have changed such that it's not in scope. If
3) I fix that 'flip' is still not in scope :)  At that point I just gave up.

1 files changed, 9 insertions, 25 deletions

diff --git a/includes/rts/storage/ClosureMacros.h b/includes/rts/storage/ClosureMacros.h
index 478ba1a5d7..694320054a 100644
--- a/includes/rts/storage/ClosureMacros.h
+++ b/includes/rts/storage/ClosureMacros.h
@@ -117,36 +117,20 @@ INLINE_HEADER StgHalfWord GET_TAG(const StgClosure *con)
    -------------------------------------------------------------------------- */
 
 #if defined(PROFILING)
-#if defined(DEBUG_RETAINER)
 /*
-  For the sake of debugging, we take the safest way for the moment. Actually, this
-  is useful to check the sanity of heap before beginning retainer profiling.
-  flip is defined in RetainerProfile.c, and declared as extern in RetainerProfile.h.
-  Note: change those functions building Haskell objects from C datatypes, i.e.,
-  all rts_mk???() functions in RtsAPI.c, as well.
- */
-#define SET_PROF_HDR(c,ccs_)            \
-        ((c)->header.prof.ccs = ccs_, (c)->header.prof.hp.rs = (retainerSet *)((StgWord)NULL | flip))
-#else
-/*
-  For retainer profiling only: we do not have to set (c)->header.prof.hp.rs to
-  NULL | flip (flip is defined in RetainerProfile.c) because even when flip
-  is 1, rs is invalid and will be initialized to NULL | flip later when
-  the closure *c is visited.
- */
-/*
-#define SET_PROF_HDR(c,ccs_)            \
-        ((c)->header.prof.ccs = ccs_, (c)->header.prof.hp.rs = NULL)
- */
-/*
-  The following macro works for both retainer profiling and LDV profiling:
-  for retainer profiling, ldvTime remains 0, so rs fields are initialized to 0.
-  See the invariants on ldvTime.
+  The following macro works for both retainer profiling and LDV profiling. For
+ retainer profiling, 'era' remains 0, so by setting the 'ldvw' field we also set
+ 'rs' to zero.
+
+ Note that we don't have to bother handling the 'flip' bit properly[1] since the
+ retainer profiling code will just set 'rs' to NULL upon visiting a closure with
+ an invalid 'flip' bit anyways.
+
+ [1]: Technically we should set 'rs' to `NULL | flip`.
  */
 #define SET_PROF_HDR(c,ccs_)            \
         ((c)->header.prof.ccs = ccs_,   \
         LDV_RECORD_CREATE((c)))
-#endif /* DEBUG_RETAINER */
 #else
 #define SET_PROF_HDR(c,ccs)
 #endif