r176924 - Tighten up the rules for precise lifetime and document

[Dmitri Gribenko]

On Wed, Mar 13, 2013 at 11:20 AM, Jean-Daniel Dupas
<devlists at shadowlab.org> wrote:
>
> Le 13 mars 2013 à 04:10, John McCall <rjmccall at apple.com> a écrit :
>
>> Author: rjmccall
>> Date: Tue Mar 12 22:10:54 2013
>> New Revision: 176924
>>
>> URL: http://llvm.org/viewvc/llvm-project?rev=176924&view=rev
>> Log:
>> Tighten up the rules for precise lifetime and document
>> the requirements on the ARC optimizer.
>>
>> rdar://13407451
>>
>
> …
>
>> +
>> +  Specifically, ARC is sometimes permitted to optimize ``release``
>> +  operations in ways which might cause an object to be deallocated
>> +  before it would otherwise be.  Without this, it would be almost
>> +  impossible to eliminate any ``retain``/``release`` pairs.  For
>> +  example, consider the following code:
>> +
>> +  .. code-block:: objc
>> +    id x = _ivar;
>> +    [x foo];
>> +
>
> For some reason, this code block does not appears in the generated html at "http://clang.llvm.org/docs/AutomaticReferenceCounting.html"
> I'm not familiar with the rst format though, so I can tell you what is wrong here.

Fixed in r176948.

Dmitri

-- 
main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
(j){printf("%d\n",i);}}} /*Dmitri Gribenko <gribozavr at gmail.com>*/