/* -----------------------------------------------------------------------------
- * $Id: Stable.c,v 1.25 2003/03/31 19:19:34 sof Exp $
*
* (c) The GHC Team, 1998-2002
*
#include "PosixSource.h"
#include "Rts.h"
#include "Hash.h"
-#include "StablePriv.h"
#include "RtsUtils.h"
#include "Storage.h"
#include "RtsAPI.h"
There may be additional functions on the C side to allow evaluation,
application, etc of a stable pointer.
- When Haskell calls C, it normally just passes over primitive integers,
- floats, bools, strings, etc. This doesn't cause any problems at all
- for garbage collection because the act of passing them makes a copy
- from the heap, stack or wherever they are onto the C-world stack.
- However, if we were to pass a heap object such as a (Haskell) @String@
- and a garbage collection occured before we finished using it, we'd run
- into problems since the heap object might have been moved or even
- deleted.
-
- So, if a C call is able to cause a garbage collection or we want to
- store a pointer to a heap object between C calls, we must be careful
- when passing heap objects. Our solution is to keep a table of all
- objects we've given to the C-world and to make sure that the garbage
- collector collects these objects --- updating the table as required to
- make sure we can still find the object.
*/
snEntry *stable_ptr_table = NULL;
#define INIT_SPT_SIZE 64
-static inline void
+STATIC_INLINE void
initFreeList(snEntry *table, nat n, snEntry *free)
{
snEntry *p;
lookupStableName(StgPtr p)
{
StgWord sn;
+ void* sn_tmp;
if (stable_ptr_free == NULL) {
enlargeStablePtrTable();
*/
p = (StgPtr)removeIndirections((StgClosure*)p);
- (void *)sn = lookupHashTable(addrToStableHash,(W_)p);
+ sn_tmp = lookupHashTable(addrToStableHash,(W_)p);
+ sn = (StgWord)sn_tmp;
if (sn != 0) {
ASSERT(stable_ptr_table[sn].addr == p);
- IF_DEBUG(stable,fprintf(stderr,"cached stable name %d at %p\n",sn,p));
+ IF_DEBUG(stable,debugBelch("cached stable name %d at %p\n",sn,p));
return sn;
} else {
sn = stable_ptr_free - stable_ptr_table;
- (P_)stable_ptr_free = stable_ptr_free->addr;
+ stable_ptr_free = (snEntry*)(stable_ptr_free->addr);
stable_ptr_table[sn].ref = 0;
stable_ptr_table[sn].addr = p;
stable_ptr_table[sn].sn_obj = NULL;
- /* IF_DEBUG(stable,fprintf(stderr,"new stable name %d at
- %p\n",sn,p)); */
+ /* IF_DEBUG(stable,debugBelch("new stable name %d at %p\n",sn,p)); */
/* add the new stable name to the hash table */
insertHashTable(addrToStableHash, (W_)p, (void *)sn);
}
}
-static inline void
+STATIC_INLINE void
freeStableName(snEntry *sn)
{
ASSERT(sn->sn_obj == NULL);
if (p->sn_obj == NULL) {
// StableName object is dead
freeStableName(p);
- IF_DEBUG(stable, fprintf(stderr,"GC'd Stable name %d\n",
- p - stable_ptr_table));
+ IF_DEBUG(stable, debugBelch("GC'd Stable name %d\n",
+ p - stable_ptr_table));
continue;
} else {
- (StgClosure *)p->addr = isAlive((StgClosure *)p->addr);
- IF_DEBUG(stable, fprintf(stderr,"Stable name %d still alive at %p, ref %d\n", p - stable_ptr_table, p->addr, p->ref));
+ p->addr = (StgPtr)isAlive((StgClosure *)p->addr);
+ IF_DEBUG(stable, debugBelch("Stable name %d still alive at %p, ref %d\n", p - stable_ptr_table, p->addr, p->ref));
}
}
}