static IntPtr RetainTrampoline(IntPtr @this, IntPtr sel)
{
int ref_count = Messaging.int_objc_msgSend(@this, Selector.RetainCount);
NSObject obj = null;
#if DEBUG_REF_COUNTING
bool had_managed_ref = HasManagedRef(@this);
int pre_gchandle = GetGCHandle(@this);
#endif
/*
* We need to decide if the gchandle should become a strong one.
* This happens if managed code has a ref, and the current refcount is 1.
*/
if (ref_count == 1)
{
obj = Runtime.TryGetNSObject(@this);
if (obj != null && obj.has_managed_ref)
{
obj.SwitchGCHandle(false /* strong */);
}
}
@this = InvokeObjCMethodImplementation(@this, sel);
#if DEBUG_REF_COUNTING
Console.WriteLine("RetainTrampoline ({0} Handle=0x{1}) initial retainCount={2}; new retainCount={3} HadManagedRef={4} HasManagedRef={5} old GCHandle={6} new GCHandle={7}",
Class.GetName(Messaging.intptr_objc_msgSend(@this, Selector.GetHandle("class"))), @this.ToString("x"), ref_count, Messaging.int_objc_msgSend(@this, Selector.RetainCount),
had_managed_ref, HasManagedRef(@this), pre_gchandle, GetGCHandle(@this));
#endif
return(@this);
}
static void ReleaseTrampoline(IntPtr @this, IntPtr sel)
{
int ref_count = Messaging.int_objc_msgSend(@this, Selector.RetainCount);
NSObject obj = null;
#if DEBUG_REF_COUNTING
Console.WriteLine("ReleaseTrampoline ({0} Handle=0x{1}) retainCount={2}; HasManagedRef={3} GCHandle={4}",
GetClassName(@this), @this.ToString("x"), ref_count, HasManagedRef(@this), GetGCHandle(@this));
#endif
/* Object is about to die. Unregister it and free any gchandles we may have */
if (ref_count == 1)
{
obj = Runtime.TryGetNSObject(@this);
if (obj != null)
{
obj.UnregisterObject();
obj.FreeGCHandle();
}
else
{
#if DEBUG_REF_COUNTING
Console.WriteLine("\tCould not find managed object");
#endif
}
}
/*
* We need to decide if the gchandle should become a weak one.
* This happens if managed code will end up holding the only ref.
*/
if (ref_count == 2)
{
obj = Runtime.TryGetNSObject(@this);
if (obj != null && obj.has_managed_ref)
{
obj.SwitchGCHandle(true /* weak */);
}
}
InvokeObjCMethodImplementation(@this, sel);
}