/* -----------------------------------------------------------------------------
- * $Id: GC.c,v 1.73 2000/03/16 17:27:12 simonmar Exp $
+ * $Id: GC.c,v 1.77 2000/03/31 03:09:36 hwloidl Exp $
*
* (c) The GHC Team 1998-1999
*
#if defined(DEBUG) && defined(GRAN)
IF_DEBUG(gc, belch("@@ Starting garbage collection at %ld (%lx)\n",
- Now, Now))
+ Now, Now));
#endif
/* tell the stats department that we've started a GC */
#if defined(GRAN)
// ToDo!: check sanity IF_DEBUG(sanity, checkTSOsSanity());
#endif
- IF_DEBUG(sanity, checkFreeListSanity());
+ IF_DEBUG(sanity, checkFreeListSanity());
/* Initialise the static object lists
*/
/* scavenge static objects */
if (major_gc && static_objects != END_OF_STATIC_LIST) {
+ IF_DEBUG(sanity,
+ checkStaticObjects());
scavenge_static();
}
/* revert dead CAFs and update enteredCAFs list */
revert_dead_CAFs();
+#if defined(PAR)
+ /* Reconstruct the Global Address tables used in GUM */
+ rebuildGAtables(major_gc);
+ IF_DEBUG(sanity, checkGlobalTSOList(rtsTrue/*check TSOs, too*/));
+ IF_DEBUG(sanity, checkLAGAtable(rtsTrue/*check closures, too*/));
+#endif
+
/* Set the maximum blocks for the oldest generation, based on twice
* the amount of live data now, adjusted to fit the maximum heap
* size if necessary.
*/
resetNurseries();
-#if defined(PAR)
- /* Reconstruct the Global Address tables used in GUM */
- RebuildGAtables(major_gc);
-#endif
-
/* start any pending finalizers */
scheduleFinalizers(old_weak_ptr_list);
/* Threads which have finished or died get dropped from
* the list.
*/
- switch (t->whatNext) {
+ switch (t->what_next) {
case ThreadKilled:
case ThreadComplete:
next = t->global_link;
* for static closures with an empty SRT or CONSTR_STATIC_NOCAFs.
*/
-#if 1 || !defined(PAR)
/* ignore closures in generations that we're not collecting. */
- /* In GUM we use this routine when rebuilding GA tables; for some
- reason it has problems with the LOOKS_LIKE_STATIC macro -- HWL */
if (LOOKS_LIKE_STATIC(p) || Bdescr((P_)p)->gen->no > N) {
return p;
}
-#endif
switch (info->type) {
goto large;
case TSO:
- if (((StgTSO *)p)->whatNext == ThreadRelocated) {
+ if (((StgTSO *)p)->what_next == ThreadRelocated) {
p = (StgClosure *)((StgTSO *)p)->link;
continue;
}
StgClosure *
MarkRoot(StgClosure *root)
{
+# if 0 && defined(PAR) && defined(DEBUG)
+ StgClosure *foo = evacuate(root);
+ // ASSERT(closure_STATIC(foo) || maybeLarge(foo) || Bdescr(foo)->evacuated);
+ ASSERT(isAlive(foo)); // must be in to-space
+ return foo;
+# else
return evacuate(root);
+# endif
}
//@cindex addBlock
case AP_UPD:
case PAP:
- /* these are special - the payload is a copy of a chunk of stack,
- tagging and all. */
- return copy(q,pap_sizeW((StgPAP *)q),step);
+ /* PAPs and AP_UPDs are special - the payload is a copy of a chunk
+ * of stack, tagging and all.
+ *
+ * They can be larger than a block in size. Both are only
+ * allocated via allocate(), so they should be chained on to the
+ * large_object list.
+ */
+ {
+ nat size = pap_sizeW((StgPAP*)q);
+ if (size >= LARGE_OBJECT_THRESHOLD/sizeof(W_)) {
+ evacuate_large((P_)q, rtsFalse);
+ return q;
+ } else {
+ return copy(q,size,step);
+ }
+ }
case EVACUATED:
/* Already evacuated, just return the forwarding address.
/* Deal with redirected TSOs (a TSO that's had its stack enlarged).
*/
- if (tso->whatNext == ThreadRelocated) {
+ if (tso->what_next == ThreadRelocated) {
q = (StgClosure *)tso->link;
goto loop;
}
(StgClosure *)tso->link = evacuate((StgClosure *)tso->link);
if ( tso->why_blocked == BlockedOnMVar
|| tso->why_blocked == BlockedOnBlackHole
- || tso->why_blocked == BlockedOnException) {
+ || tso->why_blocked == BlockedOnException
+#if defined(PAR)
+ || tso->why_blocked == BlockedOnGA
+ || tso->why_blocked == BlockedOnGA_NoSend
+#endif
+ ) {
tso->block_info.closure = evacuate(tso->block_info.closure);
}
if ( tso->blocked_exceptions != NULL ) {
#endif
case EVACUATED:
- barf("scavenge: unimplemented/strange closure type\n");
+ barf("scavenge: unimplemented/strange closure type %d @ %p",
+ info->type, p);
default:
- barf("scavenge");
+ barf("scavenge: unimplemented/strange closure type %d @ %p",
+ info->type, p);
}
/* If we didn't manage to promote all the objects pointed to by
break;
default:
- barf("scavenge_one: strange object");
+ barf("scavenge_one: strange object %d", (int)(info->type));
}
no_luck = failed_to_evac;
{
StgPtr end, q;
- IF_DEBUG(gc,
- belch("@@ scavenge_mut_list: scavenging MUT_ARR_PTRS_FROZEN %p; size: %#x ; next: %p",
- p, mut_arr_ptrs_sizeW((StgMutArrPtrs*)p), p->mut_link));
-
end = (P_)p + mut_arr_ptrs_sizeW((StgMutArrPtrs*)p);
evac_gen = gen->no;
for (q = (P_)((StgMutArrPtrs *)p)->payload; q < end; q++) {
{
StgPtr end, q;
- IF_DEBUG(gc,
- belch("@@ scavenge_mut_list: scavenging MUT_ARR_PTRS %p; size: %#x ; next: %p",
- p, mut_arr_ptrs_sizeW((StgMutArrPtrs*)p), p->mut_link));
-
end = (P_)p + mut_arr_ptrs_sizeW((StgMutArrPtrs*)p);
for (q = (P_)((StgMutArrPtrs *)p)->payload; q < end; q++) {
(StgClosure *)*q = evacuate((StgClosure *)*q);
* it from the mutable list if possible by promoting whatever it
* points to.
*/
- IF_DEBUG(gc,
- belch("@@ scavenge_mut_list: scavenging MUT_VAR %p; var: %p ; next: %p",
- p, ((StgMutVar *)p)->var, p->mut_link));
-
ASSERT(p->header.info != &MUT_CONS_info);
((StgMutVar *)p)->var = evacuate(((StgMutVar *)p)->var);
p->mut_link = gen->mut_list;
case MVAR:
{
StgMVar *mvar = (StgMVar *)p;
-
- IF_DEBUG(gc,
- belch("@@ scavenge_mut_list: scavenging MAVR %p; head: %p; tail: %p; value: %p ; next: %p",
- mvar, mvar->head, mvar->tail, mvar->value, p->mut_link));
-
(StgClosure *)mvar->head = evacuate((StgClosure *)mvar->head);
(StgClosure *)mvar->tail = evacuate((StgClosure *)mvar->tail);
(StgClosure *)mvar->value = evacuate((StgClosure *)mvar->value);
case BLACKHOLE_BQ:
{
StgBlockingQueue *bh = (StgBlockingQueue *)p;
-
- IF_DEBUG(gc,
- belch("@@ scavenge_mut_list: scavenging BLACKHOLE_BQ (%p); next: %p",
- p, p->mut_link));
-
(StgClosure *)bh->blocking_queue =
evacuate((StgClosure *)bh->blocking_queue);
p->mut_link = gen->mut_list;
}
continue;
- // HWL: old PAR code deleted here
+#if defined(PAR)
+ // HWL: check whether all of these are necessary
+
+ case RBH: // cf. BLACKHOLE_BQ
+ {
+ // nat size, ptrs, nonptrs, vhs;
+ // char str[80];
+ // StgInfoTable *rip = get_closure_info(p, &size, &ptrs, &nonptrs, &vhs, str);
+ StgRBH *rbh = (StgRBH *)p;
+ (StgClosure *)rbh->blocking_queue =
+ evacuate((StgClosure *)rbh->blocking_queue);
+ if (failed_to_evac) {
+ failed_to_evac = rtsFalse;
+ recordMutable((StgMutClosure *)rbh);
+ }
+ // ToDo: use size of reverted closure here!
+ p += BLACKHOLE_sizeW();
+ break;
+ }
+
+ case BLOCKED_FETCH:
+ {
+ StgBlockedFetch *bf = (StgBlockedFetch *)p;
+ /* follow the pointer to the node which is being demanded */
+ (StgClosure *)bf->node =
+ evacuate((StgClosure *)bf->node);
+ /* follow the link to the rest of the blocking queue */
+ (StgClosure *)bf->link =
+ evacuate((StgClosure *)bf->link);
+ if (failed_to_evac) {
+ failed_to_evac = rtsFalse;
+ recordMutable((StgMutClosure *)bf);
+ }
+ p += sizeofW(StgBlockedFetch);
+ break;
+ }
+
+ case FETCH_ME:
+ p += sizeofW(StgFetchMe);
+ break; // nothing to do in this case
+
+ case FETCH_ME_BQ: // cf. BLACKHOLE_BQ
+ {
+ StgFetchMeBlockingQueue *fmbq = (StgFetchMeBlockingQueue *)p;
+ (StgClosure *)fmbq->blocking_queue =
+ evacuate((StgClosure *)fmbq->blocking_queue);
+ if (failed_to_evac) {
+ failed_to_evac = rtsFalse;
+ recordMutable((StgMutClosure *)fmbq);
+ }
+ p += sizeofW(StgFetchMeBlockingQueue);
+ break;
+ }
+#endif
default:
/* shouldn't have anything else on the mutables list */
}
default:
- barf("scavenge_static");
+ barf("scavenge_static: strange closure %d", (int)(info->type));
}
ASSERT(failed_to_evac == rtsFalse);
- /* get the next static object from the list. Remeber, there might
+ /* get the next static object from the list. Remember, there might
* be more stuff on this list now that we've done some evacuating!
* (static_objects is a global)
*/
case STOP_FRAME:
case CATCH_FRAME:
case SEQ_FRAME:
- {
- // StgPtr old_p = p; // debugging only -- HWL
- /* stack frames like these are ordinary closures and therefore may
- contain setup-specific fixed-header words (as in GranSim!);
- therefore, these cases should not use p++ but &(p->payload) -- HWL */
- // IF_DEBUG(gran, IF_DEBUG(sanity, printObj(p)));
- bitmap = info->layout.bitmap;
-
- p = (StgPtr)&(((StgClosure *)p)->payload);
- // IF_DEBUG(sanity, belch("HWL: scavenge_stack: (STOP|CATCH|SEQ)_FRAME adjusting p from %p to %p (instead of %p)", old_p, p, old_p+1));
- goto small_bitmap;
- }
case RET_BCO:
case RET_SMALL:
case RET_VEC_SMALL:
}
default:
- barf("scavenge_stack: weird activation record found on stack.\n");
+ barf("scavenge_stack: weird activation record found on stack: %d", (int)(info->type));
}
}
}
case TSO:
scavengeTSO((StgTSO *)p);
- // HWL: old PAR code deleted here
continue;
+ case AP_UPD:
+ case PAP:
+ {
+ StgPAP* pap = (StgPAP *)p;
+
+ evac_gen = saved_evac_gen; /* not really mutable */
+ pap->fun = evacuate(pap->fun);
+ scavenge_stack((P_)pap->payload, (P_)pap->payload + pap->n_args);
+ evac_gen = 0;
+ continue;
+ }
+
default:
- barf("scavenge_large: unknown/strange object");
+ barf("scavenge_large: unknown/strange object %d", (int)(info->type));
}
}
}
* turned on.
* -------------------------------------------------------------------------- */
//@cindex threadPaused
-
void
threadPaused(StgTSO *tso)
{
{
StgMutClosure *p, *next;
- p = gen->saved_mut_list;
+ p = gen->mut_list;
next = p->mut_link;
- fprintf(stderr, "@@ Mutable list %p: ", gen->saved_mut_list);
+ fprintf(stderr, "@@ Mutable list %p: ", gen->mut_list);
for (; p != END_MUT_LIST; p = next, next = p->mut_link) {
fprintf(stderr, "%p (%s), ",
p, info_type((StgClosure *)p));
}
fputc('\n', stderr);
}
+
+//@cindex maybeLarge
+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 == TSO ||
+ info->type == ARR_WORDS ||
+ info->type == BCO);
+}
+
+
#endif /* DEBUG */
//@node Index, , Pausing a thread
//* evacuate_large:: @cindex\s-+evacuate_large
//* gcCAFs:: @cindex\s-+gcCAFs
//* isAlive:: @cindex\s-+isAlive
+//* maybeLarge:: @cindex\s-+maybeLarge
//* mkMutCons:: @cindex\s-+mkMutCons
+//* printMutOnceList:: @cindex\s-+printMutOnceList
+//* printMutableList:: @cindex\s-+printMutableList
//* relocate_TSO:: @cindex\s-+relocate_TSO
//* revert_dead_CAFs:: @cindex\s-+revert_dead_CAFs
//* scavenge:: @cindex\s-+scavenge
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