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struct weak_ref {
id **locations;
size_t count;
};
static struct objc_hashtable *hashtable;
#ifdef OF_HAVE_THREADS
static of_spinlock_t spinlock;
#endif
static uint32_t
hash(const void *object)
{
return (uint32_t)(uintptr_t)object;
}
static bool
equal(const void *object1, const void *object2)
{
return (object1 == object2);
}
OF_CONSTRUCTOR()
{
hashtable = objc_hashtable_new(hash, equal, 2);
#ifdef OF_HAVE_THREADS
if (of_spinlock_new(&spinlock) != 0)
OBJC_ERROR("Failed to create spinlock!");
#endif
}
id
objc_retain(id object)
{
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struct weak_ref {
id **locations;
size_t count;
};
static struct objc_hashtable *hashtable;
#ifdef OF_HAVE_THREADS
static OFSpinlock spinlock;
#endif
static uint32_t
hash(const void *object)
{
return (uint32_t)(uintptr_t)object;
}
static bool
equal(const void *object1, const void *object2)
{
return (object1 == object2);
}
OF_CONSTRUCTOR()
{
hashtable = objc_hashtable_new(hash, equal, 2);
#ifdef OF_HAVE_THREADS
if (OFSpinlockNew(&spinlock) != 0)
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) != 0)
OBJC_ERROR("Failed to lock spinlock!");
#endif
if (*object != nil &&
(old = objc_hashtable_get(hashtable, *object)) != NULL) {
for (size_t i = 0; i < old->count; i++) {
if (old->locations[i] == object) {
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id
objc_storeWeak(id *object, id value)
{
struct weak_ref *old;
#ifdef OF_HAVE_THREADS
if (OFSpinlockLock(&spinlock) != 0)
OBJC_ERROR("Failed to lock spinlock!");
#endif
if (*object != nil &&
(old = objc_hashtable_get(hashtable, *object)) != NULL) {
for (size_t i = 0; i < old->count; i++) {
if (old->locations[i] == object) {
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ref->locations[ref->count++] = object;
} else
value = nil;
*object = value;
#ifdef OF_HAVE_THREADS
if (of_spinlock_unlock(&spinlock) != 0)
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) != 0)
OBJC_ERROR("Failed to lock spinlock!");
#endif
if (*object != nil &&
(ref = objc_hashtable_get(hashtable, *object)) != NULL)
value = *object;
#ifdef OF_HAVE_THREADS
if (of_spinlock_unlock(&spinlock) != 0)
OBJC_ERROR("Failed to unlock spinlock!");
#endif
if (class_respondsToSelector(object_getClass(value),
@selector(retainWeakReference)) && [value retainWeakReference])
return value;
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ref->locations[ref->count++] = object;
} else
value = nil;
*object = value;
#ifdef OF_HAVE_THREADS
if (OFSpinlockUnlock(&spinlock) != 0)
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 (OFSpinlockLock(&spinlock) != 0)
OBJC_ERROR("Failed to lock spinlock!");
#endif
if (*object != nil &&
(ref = objc_hashtable_get(hashtable, *object)) != NULL)
value = *object;
#ifdef OF_HAVE_THREADS
if (OFSpinlockUnlock(&spinlock) != 0)
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) != 0)
OBJC_ERROR("Failed to lock spinlock!");
#endif
if (*src != nil &&
(ref = objc_hashtable_get(hashtable, *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) != 0)
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) != 0)
OBJC_ERROR("Failed to lock spinlock!");
#endif
if ((ref = objc_hashtable_get(hashtable, value)) != NULL) {
for (size_t i = 0; i < ref->count; i++)
*ref->locations[i] = nil;
objc_hashtable_delete(hashtable, value);
free(ref->locations);
free(ref);
}
#ifdef OF_HAVE_THREADS
if (of_spinlock_unlock(&spinlock) != 0)
OBJC_ERROR("Failed to unlock spinlock!");
#endif
}
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void
objc_moveWeak(id *dest, id *src)
{
struct weak_ref *ref;
#ifdef OF_HAVE_THREADS
if (OFSpinlockLock(&spinlock) != 0)
OBJC_ERROR("Failed to lock spinlock!");
#endif
if (*src != nil &&
(ref = objc_hashtable_get(hashtable, *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 (OFSpinlockUnlock(&spinlock) != 0)
OBJC_ERROR("Failed to unlock spinlock!");
#endif
}
void
objc_zero_weak_references(id value)
{
struct weak_ref *ref;
#ifdef OF_HAVE_THREADS
if (OFSpinlockLock(&spinlock) != 0)
OBJC_ERROR("Failed to lock spinlock!");
#endif
if ((ref = objc_hashtable_get(hashtable, value)) != NULL) {
for (size_t i = 0; i < ref->count; i++)
*ref->locations[i] = nil;
objc_hashtable_delete(hashtable, value);
free(ref->locations);
free(ref);
}
#ifdef OF_HAVE_THREADS
if (OFSpinlockUnlock(&spinlock) != 0)
OBJC_ERROR("Failed to unlock spinlock!");
#endif
}
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