[LLVMdev] Check the location of the definition of a Value object

[Zheng Wang]

Hello,

How to check whether a value object is within a particular basic block or not.

I have the following LLVM bytecode:

------------------------
entry:
  ...
  %2 = call i32 (...)* @atoi(i8*%1) nounwind
  ...

--
bb1:
  ..
  %5 = icmp sgt i32 %2, %i.0
  ...
-----------------

Here I got the corresponding pointer of the Value object of *%2*. How
can I check whether it is defined in *entry* or not?

I tried:
---------------------
//Value* pb corresponding to %2
for (BasicBlock::iterator I=entry->begin(), e=entry.end(); I != e; I++)
{
       if (I == pb)
          return true;
}
return false;
----------------------

However, I got  errors when compiled the code. Could anyone give some
simple examples about this issue?

Thanks.

Cheers,
Zheng