nat i;
to = alloc_for_copy(size,gen);
- *p = TAG_CLOSURE(tag,(StgClosure*)to);
- src->header.info = (const StgInfoTable *)MK_FORWARDING_PTR(to);
-
+
from = (StgPtr)src;
to[0] = (W_)info;
for (i = 1; i < size; i++) { // unroll for small i
to[i] = from[i];
}
+ // if somebody else reads the forwarding pointer, we better make
+ // sure there's a closure at the end of it.
+ write_barrier();
+ *p = TAG_CLOSURE(tag,(StgClosure*)to);
+ src->header.info = (const StgInfoTable *)MK_FORWARDING_PTR(to);
+
// if (to+size+2 < bd->start + BLOCK_SIZE_W) {
// __builtin_prefetch(to + size + 2, 1);
// }
/* Special version of copy() for when we only want to copy the info
* pointer of an object, but reserve some padding after it. This is
- * used to optimise evacuation of BLACKHOLEs.
+ * used to optimise evacuation of TSOs.
*/
static rtsBool
copyPart(StgClosure **p, StgClosure *src, nat size_to_reserve,
#endif
to = alloc_for_copy(size_to_reserve, gen);
- *p = (StgClosure *)to;
from = (StgPtr)src;
to[0] = info;
to[i] = from[i];
}
-#if defined(PARALLEL_GC)
write_barrier();
-#endif
src->header.info = (const StgInfoTable*)MK_FORWARDING_PTR(to);
+ *p = (StgClosure *)to;
#ifdef PROFILING
// We store the size of the just evacuated object in the LDV word so that
tag = GET_CLOSURE_TAG(q);
q = UNTAG_CLOSURE(q);
- ASSERT(LOOKS_LIKE_CLOSURE_PTR(q));
+ ASSERTM(LOOKS_LIKE_CLOSURE_PTR(q), "invalid closure, info=%p", q->header.info);
if (!HEAP_ALLOCED_GC(q)) {
* on the CAF list, so don't do anything with it here (we'll
* scavenge it later).
*/
- if (((StgIndStatic *)q)->saved_info == NULL) {
- if (*IND_STATIC_LINK((StgClosure *)q) == NULL) {
+ if (*IND_STATIC_LINK((StgClosure *)q) == NULL) {
#ifndef THREADED_RTS
*IND_STATIC_LINK((StgClosure *)q) = gct->static_objects;
gct->static_objects = (StgClosure *)q;
gct->static_objects = (StgClosure *)q;
}
#endif
- }
}
return;
case FUN:
case IND_PERM:
- case IND_OLDGEN_PERM:
case CONSTR:
copy_tag_nolock(p,info,q,sizeW_fromITBL(INFO_PTR_TO_STRUCT(info)),gen,tag);
return;
+ case BLACKHOLE:
+ {
+ StgClosure *r;
+ const StgInfoTable *i;
+ r = ((StgInd*)q)->indirectee;
+ if (GET_CLOSURE_TAG(r) == 0) {
+ i = r->header.info;
+ if (IS_FORWARDING_PTR(i)) {
+ r = (StgClosure *)UN_FORWARDING_PTR(i);
+ i = r->header.info;
+ }
+ if (i == &stg_TSO_info
+ || i == &stg_WHITEHOLE_info
+ || i == &stg_BLOCKING_QUEUE_CLEAN_info
+ || i == &stg_BLOCKING_QUEUE_DIRTY_info) {
+ copy(p,info,q,sizeofW(StgInd),gen);
+ return;
+ }
+ ASSERT(i != &stg_IND_info);
+ }
+ q = r;
+ *p = r;
+ goto loop;
+ }
+
+ case BLOCKING_QUEUE:
case WEAK:
- case STABLE_NAME:
- copy_tag(p,info,q,sizeW_fromITBL(INFO_PTR_TO_STRUCT(info)),gen,tag);
+ case PRIM:
+ case MUT_PRIM:
+ copy(p,info,q,sizeW_fromITBL(INFO_PTR_TO_STRUCT(info)),gen);
return;
case BCO:
copy(p,info,q,bco_sizeW((StgBCO *)q),gen);
return;
- case CAF_BLACKHOLE:
- case BLACKHOLE:
- copyPart(p,q,BLACKHOLE_sizeW(),sizeofW(StgHeader),gen);
- return;
-
case THUNK_SELECTOR:
eval_thunk_selector(p, (StgSelector *)q, rtsTrue);
return;
case IND:
- case IND_OLDGEN:
// follow chains of indirections, don't evacuate them
q = ((StgInd*)q)->indirectee;
*p = q;
}
}
- case TREC_HEADER:
- copy(p,info,q,sizeofW(StgTRecHeader),gen);
- return;
-
- case TVAR_WATCH_QUEUE:
- copy(p,info,q,sizeofW(StgTVarWatchQueue),gen);
- return;
-
- case TVAR:
- copy(p,info,q,sizeofW(StgTVar),gen);
- return;
-
case TREC_CHUNK:
copy(p,info,q,sizeofW(StgTRecChunk),gen);
return;
- case ATOMIC_INVARIANT:
- copy(p,info,q,sizeofW(StgAtomicInvariant),gen);
- return;
-
- case INVARIANT_CHECK_QUEUE:
- copy(p,info,q,sizeofW(StgInvariantCheckQueue),gen);
- return;
-
default:
barf("evacuate: strange closure type %d", (int)(INFO_PTR_TO_STRUCT(info)->type));
}
prev = NULL;
while (p)
{
-#ifdef THREADED_RTS
ASSERT(p->header.info == &stg_WHITEHOLE_info);
-#else
- ASSERT(p->header.info == &stg_BLACKHOLE_info);
-#endif
// val must be in to-space. Not always: when we recursively
// invoke eval_thunk_selector(), the recursive calls will not
// evacuate the value (because we want to select on the value,
// indirection pointing to itself, and we want the program
// to deadlock if it ever enters this closure, so
// BLACKHOLE is correct.
- SET_INFO(p, &stg_BLACKHOLE_info);
+
+ // XXX we do not have BLACKHOLEs any more; replace with
+ // a THUNK_SELECTOR again. This will go into a loop if it is
+ // entered, and should result in a NonTermination exception.
+ ((StgThunk *)p)->payload[0] = val;
+ write_barrier();
+ SET_INFO(p, &stg_sel_0_upd_info);
} else {
((StgInd *)p)->indirectee = val;
write_barrier();
prev_thunk_selector = NULL;
// this is a chain of THUNK_SELECTORs that we are going to update
// to point to the value of the current THUNK_SELECTOR. Each
- // closure on the chain is a BLACKHOLE, and points to the next in the
+ // closure on the chain is a WHITEHOLE, and points to the next in the
// chain with payload[0].
selector_chain:
}
- // BLACKHOLE the selector thunk, since it is now under evaluation.
+ // WHITEHOLE the selector thunk, since it is now under evaluation.
// This is important to stop us going into an infinite loop if
// this selector thunk eventually refers to itself.
#if defined(THREADED_RTS)
} while (info_ptr == (W_)&stg_WHITEHOLE_info);
// make sure someone else didn't get here first...
- if (IS_FORWARDING_PTR(p) ||
+ if (IS_FORWARDING_PTR(info_ptr) ||
INFO_PTR_TO_STRUCT(info_ptr)->type != THUNK_SELECTOR) {
// v. tricky now. The THUNK_SELECTOR has been evacuated
// by another thread, and is now either a forwarding ptr or IND.
#else
// Save the real info pointer (NOTE: not the same as get_itbl()).
info_ptr = (StgWord)p->header.info;
- SET_INFO(p,&stg_BLACKHOLE_info);
+ SET_INFO(p,&stg_WHITEHOLE_info);
#endif
field = INFO_PTR_TO_STRUCT(info_ptr)->layout.selector_offset;
// the original selector thunk, p.
SET_INFO(p, (StgInfoTable *)info_ptr);
LDV_RECORD_DEAD_FILL_SLOP_DYNAMIC((StgClosure *)p);
-#if defined(THREADED_RTS)
SET_INFO(p, &stg_WHITEHOLE_info);
-#else
- SET_INFO(p, &stg_BLACKHOLE_info);
-#endif
#endif
// the closure in val is now the "value" of the
switch (info->type) {
case IND:
case IND_PERM:
- case IND_OLDGEN:
- case IND_OLDGEN_PERM:
case IND_STATIC:
val = ((StgInd *)val)->indirectee;
goto val_loop;
case IND:
case IND_PERM:
- case IND_OLDGEN:
- case IND_OLDGEN_PERM:
case IND_STATIC:
// Again, we might need to untag a constructor.
selectee = UNTAG_CLOSURE( ((StgInd *)selectee)->indirectee );
goto selector_loop;
+ case BLACKHOLE:
+ {
+ StgClosure *r;
+ const StgInfoTable *i;
+ r = ((StgInd*)selectee)->indirectee;
+
+ // establish whether this BH has been updated, and is now an
+ // indirection, as in evacuate().
+ if (GET_CLOSURE_TAG(r) == 0) {
+ i = r->header.info;
+ if (IS_FORWARDING_PTR(i)) {
+ r = (StgClosure *)UN_FORWARDING_PTR(i);
+ i = r->header.info;
+ }
+ if (i == &stg_TSO_info
+ || i == &stg_WHITEHOLE_info
+ || i == &stg_BLOCKING_QUEUE_CLEAN_info
+ || i == &stg_BLOCKING_QUEUE_DIRTY_info) {
+ goto bale_out;
+ }
+ ASSERT(i != &stg_IND_info);
+ }
+
+ selectee = UNTAG_CLOSURE( ((StgInd *)selectee)->indirectee );
+ goto selector_loop;
+ }
+
case THUNK_SELECTOR:
{
StgClosure *val;
case THUNK_1_1:
case THUNK_0_2:
case THUNK_STATIC:
- case CAF_BLACKHOLE:
- case BLACKHOLE:
// not evaluated yet
goto bale_out;
projects / ghc-hetmet.git / blobdiff