r176924 - Tighten up the rules for precise lifetime and document

[Jean-Daniel Dupas]

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.

-- Jean-Daniel