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Re: NSInvocation crashes in AutoreleasePool
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Re: NSInvocation crashes in AutoreleasePool


  • Subject: Re: NSInvocation crashes in AutoreleasePool
  • From: Greg Parker <email@hidden>
  • Date: Tue, 21 Oct 2014 13:17:36 -0700

> On Oct 21, 2014, at 2:44 AM, Gerriet M. Denkmann <email@hidden> wrote:
>
> 10.10, Xcode 6.1, using Arc.
>
> The following code works fine, with USE_INVOCATION defined or not:

[...]

> Without USE_INVOCATION defined, I get some compiler warning about potential leaks, because selector is unknown.
>
> But with USE_INVOCATION defined, it will crash later (when all has been done), obviously while cleaning an AutoreleasePool:

[...]

> Seems like Arc (or I) is somehow confused.
>
> Any help would be greatly appreciated.

Start with the Allocations instrument. It will show you the retain/release history of the dead object.

(My guess is that the bug is the call to -getReturnValue:. That method simply copies the return value's bytes into the destination variable, but ARC thinks the destination variable stores a retained pointer. The Allocations instrument should show that the returned object is the one that is used after deallocation.)


--
Greg Parker     email@hidden     Runtime Wrangler



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 >NSInvocation crashes in AutoreleasePool (From: "Gerriet M. Denkmann" <email@hidden>)

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