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#import "OFBlock.h"
struct weak_ref {
id **locations;
size_t count;
};
static struct objc_hashtable *hashtable;
#ifdef OF_HAVE_THREADS
static of_spinlock_t spinlock;
#endif
hashtable = objc_hashtable_new(obj_hash, obj_equal, 2);
weak_refs = objc_hashtable_new(obj_hash, obj_equal, 2);
#ifdef OF_HAVE_THREADS
if (!of_spinlock_new(&spinlock))
if (!of_spinlock_new(&weak_refs_lock))
OBJC_ERROR("Failed to create spinlock!")
#endif
}
id
objc_retain(id object)
{
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id
objc_storeWeak(id *object, id value)
{
struct weak_ref *old;
#ifdef OF_HAVE_THREADS
if (!of_spinlock_lock(&spinlock))
if (!of_spinlock_lock(&weak_refs_lock))
OBJC_ERROR("Failed to lock spinlock!")
#endif
if (*object != nil &&
(old = objc_hashtable_get(hashtable, *object)) != NULL) {
(old = objc_hashtable_get(weak_refs, *object)) != NULL) {
for (size_t i = 0; i < old->count; i++) {
if (old->locations[i] == object) {
if (--old->count == 0) {
objc_hashtable_delete(hashtable,
objc_hashtable_delete(weak_refs,
*object);
free(old->locations);
free(old);
} else {
id **locations;
old->locations[i] =
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break;
}
}
}
if (value != nil && class_respondsToSelector(object_getClass(value),
@selector(allowsWeakReference)) && [value allowsWeakReference]) {
struct weak_ref *ref = objc_hashtable_get(hashtable, value);
struct weak_ref *ref = objc_hashtable_get(weak_refs, value);
if (ref == NULL) {
if ((ref = calloc(1, sizeof(*ref))) == NULL)
OBJC_ERROR("Not enough memory to allocate weak "
"reference!");
objc_hashtable_set(hashtable, value, ref);
objc_hashtable_set(weak_refs, value, ref);
}
if ((ref->locations = realloc(ref->locations,
(ref->count + 1) * sizeof(id *))) == NULL)
OBJC_ERROR("Not enough memory to allocate weak "
"reference!")
ref->locations[ref->count++] = object;
} else
value = nil;
*object = value;
#ifdef OF_HAVE_THREADS
if (!of_spinlock_unlock(&spinlock))
if (!of_spinlock_unlock(&weak_refs_lock))
OBJC_ERROR("Failed to unlock spinlock!")
#endif
return value;
}
id
objc_loadWeakRetained(id *object)
{
id value = nil;
struct weak_ref *ref;
#ifdef OF_HAVE_THREADS
if (!of_spinlock_lock(&spinlock))
if (!of_spinlock_lock(&weak_refs_lock))
OBJC_ERROR("Failed to lock spinlock!")
#endif
if ((ref = objc_hashtable_get(hashtable, *object)) != NULL)
if ((ref = objc_hashtable_get(weak_refs, *object)) != NULL)
value = *object;
#ifdef OF_HAVE_THREADS
if (!of_spinlock_unlock(&spinlock))
if (!of_spinlock_unlock(&weak_refs_lock))
OBJC_ERROR("Failed to unlock spinlock!")
#endif
if (class_respondsToSelector(object_getClass(value),
@selector(retainWeakReference)) && [value retainWeakReference])
return value;
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void
objc_moveWeak(id *dest, id *src)
{
struct weak_ref *ref;
#ifdef OF_HAVE_THREADS
if (!of_spinlock_lock(&spinlock))
if (!of_spinlock_lock(&weak_refs_lock))
OBJC_ERROR("Failed to lock spinlock!")
#endif
if ((ref = objc_hashtable_get(hashtable, *src)) != NULL) {
if ((ref = objc_hashtable_get(weak_refs, *src)) != NULL) {
for (size_t i = 0; i < ref->count; i++) {
if (ref->locations[i] == src) {
ref->locations[i] = dest;
break;
}
}
}
*dest = *src;
*src = nil;
#ifdef OF_HAVE_THREADS
if (!of_spinlock_unlock(&spinlock))
if (!of_spinlock_unlock(&weak_refs_lock))
OBJC_ERROR("Failed to unlock spinlock!")
#endif
}
void
objc_zero_weak_references(id value)
{
struct weak_ref *ref;
#ifdef OF_HAVE_THREADS
if (!of_spinlock_lock(&spinlock))
if (!of_spinlock_lock(&weak_refs_lock))
OBJC_ERROR("Failed to lock spinlock!")
#endif
if ((ref = objc_hashtable_get(hashtable, value)) != NULL) {
if ((ref = objc_hashtable_get(weak_refs, value)) != NULL) {
for (size_t i = 0; i < ref->count; i++)
*ref->locations[i] = nil;
objc_hashtable_delete(hashtable, value);
objc_hashtable_delete(weak_refs, value);
free(ref->locations);
free(ref);
}
#ifdef OF_HAVE_THREADS
if (!of_spinlock_unlock(&spinlock))
if (!of_spinlock_unlock(&weak_refs_lock))
OBJC_ERROR("Failed to unlock spinlock!")
#endif
}
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