llvm dev - Dec 2010 - [LLVMdev] How can I determine safely if a CallSite is "live" in a DSGraphs context

Hi,

I'm using DSAnalysis in order to get some points to information. In my
particular case for a CallSite.
Everything is working well except for some special cases. Consider the following
example code:

// =====================
   void m(short *s) {
       return;
   }

   int main() {
       m(0);
   }

// =====================
The call to method m in the main method is translated to "call void @m(i16*
null) nounwind ssp".
If I try to call getDSCallSiteForCallSite(...) with the above mentioned CallSite
as argument on the DSGraph of the main method I get a failing assertion when the
getDSCallSiteForCallSite method tries to get the DSNode (via
getNodeForValue(...)) for the "i16* null" argument. So it obviously
thinks it should have a node for that value (since shouldHaveNodeForValue(i16*
null) returns true) and thus calls getNodeForValue, which raises the error (The
node is not contained in the ScalarMap).

I tried to verify if I'm using the analysis correctly by invoking the
poolalloc tool on the program which raises a completely different error.

So under which circumstances is it safe to call getDSCallSiteForCallSite?

Or stated otherwise: Should shouldHaveNodeForValue() return true for a
ConstantPointerNullValue?

Thanks, Kevin

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