Check for printf in call instruction

Question

 %1 = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([22 x i8]* @.str, i64 0, i64 0), i32 7) #3

For the above instruction, how can I check whether the call instruction contains printf ?

score 1 · Accepted Answer · edited Jan 03 '15 at 20:55

1

Just compare the name of the called function:

bool isPrintfCall(CallInst &C) {
   auto *F = C.getCalledFunction();
   auto isPrintf = (F->getName() == "printf");
   return isPrintf;
}

edited Jan 03 '15 at 20:55

SteffenG

answered Jan 03 '15 at 18:42

Joky

The C.getCalledFunction() returns null in LLVM 8.0 any trick for the new version of LLVM – Bernard Nongpoh Sep 25 '18 at 10:39
I shouldn't return null unless you're calling an anonymous function I think. – Joky Sep 26 '18 at 16:53

1 Answers1