Get instance of CallGraph of a module in the pass

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1

Hello,

I want an instance of CallGraph in my pass. By looking at -dot-callgraph source, I’ve tried something like this:

CallGraphWrapperPass *CGWP = new CallGraphWrapperPass();

PM.add(CGWP);

CallGraph *CG = &CGWP->getCallGraph();

PM.add(new MyPass(CG));

I get the following error:

/home/riyad/installs/llvm-3.7.0/include/llvm/PassSupport.h:95:38: error: no matching constructor for initialization of

‘MyPass’

Pass *callDefaultCtor() { return new PassName(); }

My guess is pass manager needs pass with default constructor. Is there any easy way to get instance of call graph in my pass?

Thanks in Advance,
Riyad

2

Hi,

you could require the Call Graph pass:

void MyPass::getAnalysisUsage(AnalysisUsage &AU) const {
…
AU.addRequired();
}

and then get the result at some point in your pass:

CallGraph &CG = getAnalysis().getCallGraph();

I believe this works for you.

3

Hi Victor,

Thanks!

One more question, why “llvm.dbg.declare” and “llvm.dbg.value” are also included in the call graph? These functions are compiler intrinsic for back-end binary generation.

Riyad