[project @ 2005-05-18 14:21:49 by simonmar]

[ghc-hetmet.git] / ghc / rts / GC.c

diff --git a/ghc/rts/GC.c b/ghc/rts/GC.c
index 3d6d649..791cc4c 100644 (file)
--- a/ghc/rts/GC.c
+++ b/ghc/rts/GC.c
@@ -739,7 +739,12 @@ GarbageCollect ( void (*get_roots)(evac_fn), rtsBool force_major_gc )
          if (stp->is_compacted) {
              collected += (oldgen_saved_blocks - stp->n_blocks) * BLOCK_SIZE_W;
          } else {
-             collected += stp->n_blocks * BLOCK_SIZE_W;
+             if (g == 0 && s == 0) {
+                 collected += countNurseryBlocks() * BLOCK_SIZE_W;
+                 collected += alloc_blocks;
+             } else {
+                 collected += stp->n_blocks * BLOCK_SIZE_W;
+             }
          }
 
        /* free old memory and shift to-space into from-space for all
@@ -1029,7 +1034,7 @@ GarbageCollect ( void (*get_roots)(evac_fn), rtsBool force_major_gc )
     } else {
       // we might have added extra large blocks to the nursery, so
       // resize back to minAllocAreaSize again.
-      resizeNurseries(RtsFlags.GcFlags.minAllocAreaSize);
+      resizeNurseriesFixed(RtsFlags.GcFlags.minAllocAreaSize);
     }
   }
 
@@ -1266,6 +1271,16 @@ traverse_weak_ptr_list(void)
                  ;
              }
              
+             // Threads blocked on black holes: if the black hole
+             // is alive, then the thread is alive too.
+             if (tmp == NULL && t->why_blocked == BlockedOnBlackHole) {
+                 if (isAlive(t->block_info.closure)) {
+                     t = (StgTSO *)evacuate((StgClosure *)t);
+                     tmp = t;
+                     flag = rtsTrue;
+                 }
+             }
+
              if (tmp == NULL) {
                  // not alive (yet): leave this thread on the
                  // old_all_threads list.
@@ -1282,6 +1297,10 @@ traverse_weak_ptr_list(void)
          }
       }
       
+      /* If we evacuated any threads, we need to go back to the scavenger.
+       */
+      if (flag) return rtsTrue;
+
       /* And resurrect any threads which were about to become garbage.
        */
       {
@@ -1294,6 +1313,21 @@ traverse_weak_ptr_list(void)
          }
       }
       
+      /* Finally, we can update the blackhole_queue.  This queue
+       * simply strings together TSOs blocked on black holes, it is
+       * not intended to keep anything alive.  Hence, we do not follow
+       * pointers on the blackhole_queue until now, when we have
+       * determined which TSOs are otherwise reachable.  We know at
+       * this point that all TSOs have been evacuated, however.
+       */
+      { 
+         StgTSO **pt;
+         for (pt = &blackhole_queue; *pt != END_TSO_QUEUE; pt = &((*pt)->link)) {
+             *pt = (StgTSO *)isAlive((StgClosure *)*pt);
+             ASSERT(*pt != NULL);
+         }
+      }
+
       weak_stage = WeakDone;  // *now* we're done,
       return rtsTrue;         // but one more round of scavenging, please
 
@@ -1747,8 +1781,10 @@ loop:
   case CONSTR_2_0:
     return copy(q,sizeofW(StgHeader)+2,stp);
 
-  case FUN:
   case THUNK:
+    return copy(q,thunk_sizeW_fromITBL(info),stp);
+
+  case FUN:
   case CONSTR:
   case IND_PERM:
   case IND_OLDGEN_PERM:
@@ -2354,8 +2390,6 @@ scavenge_fun_srt(const StgInfoTable *info)
 static void
 scavengeTSO (StgTSO *tso)
 {
-    // chase the link field for any TSOs on the same queue 
-    tso->link = (StgTSO *)evacuate((StgClosure *)tso->link);
     if (   tso->why_blocked == BlockedOnMVar
        || tso->why_blocked == BlockedOnBlackHole
        || tso->why_blocked == BlockedOnException
@@ -2371,6 +2405,13 @@ scavengeTSO (StgTSO *tso)
            (StgTSO *)evacuate((StgClosure *)tso->blocked_exceptions);
     }
     
+    // We don't always chase the link field: TSOs on the blackhole
+    // queue are not automatically alive, so the link field is a
+    // "weak" pointer in that case.
+    if (tso->why_blocked != BlockedOnBlackHole) {
+       tso->link = (StgTSO *)evacuate((StgClosure *)tso->link);
+    }
+
     // scavange current transaction record
     tso->trec = (StgTRecHeader *)evacuate((StgClosure *)tso->trec);
     
@@ -3366,11 +3407,11 @@ scavenge_one(StgPtr p)
     }
 
     case PAP:
-       p = scavenge_AP((StgAP *)p);
+       p = scavenge_PAP((StgPAP *)p);
        break;
 
     case AP:
-       p = scavenge_PAP((StgPAP *)p);
+       p = scavenge_AP((StgAP *)p);
        break;
 
     case ARR_WORDS:
@@ -4167,27 +4208,13 @@ threadSqueezeStack(StgTSO *tso)
                    debugBelch("Unexpected lazy BHing required at 0x%04x",(int)bh);
 #endif
 #ifdef DEBUG
-                   /* zero out the slop so that the sanity checker can tell
-                    * where the next closure is.
-                    */
-                   { 
-                       StgInfoTable *bh_info = get_itbl(bh);
-                       nat np = bh_info->layout.payload.ptrs, 
-                           nw = bh_info->layout.payload.nptrs, i;
-                       /* don't zero out slop for a THUNK_SELECTOR,
-                        * because its layout info is used for a
-                        * different purpose, and it's exactly the
-                        * same size as a BLACKHOLE in any case.
-                        */
-                       if (bh_info->type != THUNK_SELECTOR) {
-                           for (i = 0; i < np + nw; i++) {
-                               ((StgClosure *)bh)->payload[i] = INVALID_OBJECT;
-                           }
-                       }
-                   }
+                   // zero out the slop so that the sanity checker can tell
+                   // where the next closure is.
+                   DEBUG_FILL_SLOP(bh);
 #endif
 #ifdef PROFILING
                    // We pretend that bh is now dead.
+                   // ToDo: is the slop filling the same as DEBUG_FILL_SLOP?
                    LDV_recordDead_FILL_SLOP_DYNAMIC((StgClosure *)bh);
 #endif
                    // Todo: maybe use SET_HDR() and remove LDV_RECORD_CREATE()?
@@ -4306,20 +4333,4 @@ printMutableList(generation *gen)
     }
     debugBelch("\n");
 }
-
-STATIC_INLINE rtsBool
-maybeLarge(StgClosure *closure)
-{
-  StgInfoTable *info = get_itbl(closure);
-
-  /* closure types that may be found on the new_large_objects list; 
-     see scavenge_large */
-  return (info->type == MUT_ARR_PTRS ||
-         info->type == MUT_ARR_PTRS_FROZEN ||
-         info->type == MUT_ARR_PTRS_FROZEN0 ||
-         info->type == TSO ||
-         info->type == ARR_WORDS);
-}
-
-  
 #endif /* DEBUG */