Re: Infinite loop in objc_storeWeak

[David Chisnall]

Hi Thomas,

A couple of questions:

Are you using the release version of libobjc or svn?  Your line numbers don't 
match up with mine, so it may be that this is a bug that's already fixed in 
svn.  I'm currently waiting for Quentin to test another bug fix and then I'll 
be doing a new release next week.

The second question is whether you remembered to initialise the weak pointer to 
0, or call objc_initWeak() for the first store?

David

On 15 Jun 2012, at 14:18, Thomas Davie wrote:

> Hi all,
> 
> I'm just trying to get some zeroing weak reference code working, and wrote 
> myself a little wrapper library that gives me an NSValue like object storing 
> a zeroing weak reference to another object.
> 
> Unfortunately, when that's linked into another project and run, I get an 
> infinite loop in objc_storeWeak (as shown below).
> 
> Anyone know how to deal with this scenario?
> 
> Thanks
> 
> Tom Davie
> 
> 0x00007ffff69bd37c in objc_storeWeak (addr=<optimized out>, obj=<optimized 
> out>) at arc.m:493
> 493                                   if (0 == ref->ref[i])
> (gdb) p ref
> $1 = <optimized out>
> (gdb) n
> 491                           for (int i=0 ; i<4 ; i++)
> (gdb) 
> 493                                   if (0 == ref->ref[i])
> (gdb) 
> 491                           for (int i=0 ; i<4 ; i++)
> (gdb) 
> 493                                   if (0 == ref->ref[i])
> (gdb) 
> 491                           for (int i=0 ; i<4 ; i++)
> (gdb) 
> 500                           if (ref->next == NULL)
> (gdb) 
> 491                           for (int i=0 ; i<4 ; i++)
> (gdb) 
> 493                                   if (0 == ref->ref[i])
> (gdb) 
> 491                           for (int i=0 ; i<4 ; i++)
> (gdb) 
> 493                                   if (0 == ref->ref[i])
> (gdb) 
> 491                           for (int i=0 ; i<4 ; i++)
> (gdb) 
> 493                                   if (0 == ref->ref[i])
> (gdb) 
> 491                           for (int i=0 ; i<4 ; i++)
> (gdb) 
> 493                                   if (0 == ref->ref[i])
> (gdb) 
> 491                           for (int i=0 ; i<4 ; i++)
> (gdb) 
> 500                           if (ref->next == NULL)
> (gdb) 
> 491                           for (int i=0 ; i<4 ; i++)
> (gdb) 
> 493                                   if (0 == ref->ref[i])
> (gdb) 
> 491                           for (int i=0 ; i<4 ; i++)
> (gdb) 
> 493                                   if (0 == ref->ref[i])
> (gdb) 
> 491                           for (int i=0 ; i<4 ; i++)
> 
> 
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