Re: ARC
Re: ARC
- Subject: Re: ARC
- From: Jean-Daniel via Cocoa-dev <email@hidden>
- Date: Mon, 26 Aug 2019 21:43:32 +0400
A better way to investigate such issue is using the memory debugging tools in
Instrument IMHO.
That would let you see all stack traces of retain/release calls.
> Le 26 août 2019 à 04:14, Turtle Creek Software via Cocoa-dev
> <email@hidden> a écrit :
>
> In GSAppDelegate.h
> GSOutlineWindowController *mainWindowController;
>
> In GSAppDelegate.mm
> - (void) showOutlineWindow
> {
> if (mainWindowController == NULL)
> mainWindowController = [[GSOutlineWindowController alloc]
> initWithWindowNibName : @"GSOutlineWindowController"];
> [mainWindowController showWindow : self];
> }
>
> We don't do any ref-counting at all. A search for CFRetain and CFRelease
> showed zero items.
>
> I would say that ARC is certainly way better than the previous manual
> ref-counting. That must have been hellish.
> Fortunately we only started the Carbon->Cocoa port 3 years ago, so we
> didn't need to retain/release.
> But we have wasted at least a month, tracking down mysterious object
> deletions that theoretically should not happen.
>
> At this point we pretty much have breakpoints on dealloc() for every
> class. That lets us know when something is
> dying, but gives no clue as to why. Breakpoints on release() go deep into
> Apple Assembly code.
>
> On Sun, Aug 25, 2019 at 12:42 PM Jens Alfke <email@hidden> wrote:
>
>>
>>> On Aug 24, 2019, at 4:46 AM, Turtle Creek Software <
>> email@hidden> wrote:
>>>
>>> Our app delegate class is not deallocated. The window controller is
>> deallocated
>>> despite the member reference there.
>>
>> That should not be possible. Could you paste the exact line of code that
>> declares the window-controller reference in the app delegate?
>>
>> Have you verified that, at the point when the controller is dealloced, the
>> reference in the app delegate is still non-nil? (I sometimes find it useful
>> to set a breakpoint in the dealloc method, in weird cases like this.)
>>
>> Do you have any remaining code that messes with ref-counting, I.e. by
>> using CFRetain/Release on Obj-C objects?
>>
>> —Jens
>>
>> (And let me chime in that ARC is an excellent feature. Cocoa used to have
>> ‘true’ garbage collection as an option, but it was rarely used on Mac due
>> to memory and performance impact, and never implemented on iOS for that
>> reason. ARC works much better. Swift memory management is based on ARC, so
>> it’s definitely the way of the future.)
>>
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- Follow-Ups:
- Re: ARC
- From: Turtle Creek Software via Cocoa-dev <email@hidden>
| References: | |
| | >Re: ARC (From: Turtle Creek Software via Cocoa-dev <email@hidden>) |
| | >Re: ARC (From: Jens Alfke via Cocoa-dev <email@hidden>) |
| | >Re: ARC (From: Turtle Creek Software via Cocoa-dev <email@hidden>) |