[LLVMdev] problem with using DSA for a side-effect analysis

[Zvonimir Rakamaric]

Thanks guys!

I was looking into ModRef before, but I don't think that's exactly
what I need. ModRef API call getModRefInfo requires a Value to be
passed to it. However, some memory location M (which is a <DSNode,
offset> pair) visible to the caller can be modified in the callee
without any Value in the caller actually pointing to that location. I
also need to capture those...

I would need a call similar to getModRefInfo, just where second
parameter is not a Value, but a DSNodeHandle pointing to the memory
location in the caller whose ModRef status I would like to find out.
Do you maybe have anything similar to that?

-- Zvonimir


>  The ModRef info is directly available through the alias analysis dsa
>  client, and certainly easier to use.
>
>  Andrew
>
>  On Thu, Apr 3, 2008 at 1:28 PM, Vikram S. Adve <vadve at cs.uiuc.edu> wrote:
>  > Andrew, there used to be some code to compute the ModRef behavior of
>  >  functions using DS graphs.  Does that code  still exist in svn?  What
>  >  Zvonimir is asking is essentially that, although perhaps he needs it
>  >  as DS nodes explicitly rather than via the generic queries in the
>  >  AliasAnalysis interface.
>  >
>  >  --Vikram
>  >  http://www.cs.uiuc.edu/~vadve
>  >  http://llvm.org/
>  >
>  >
>  >
>  >
>  >
>  >  On Apr 3, 2008, at 12:45 PM, Andrew Lenharth wrote:
>  >
>  >  > On Thu, Apr 3, 2008 at 12:29 PM, Zvonimir Rakamaric <zrakamar at gmail.com
>  >  > > wrote:
>  >  >> Currently I am using DSGraph::computeNodeMapping to do the task,
>  >  >> but I
>  >  >> am not sure if that's the way to go....
>  >  >
>  >  > I believe that is the correct function to use.
>  >  >
>  >  > Andrew