How to pass analysis info from one pass to another

Beginners
1

I have to get the callgraph of a module before any module-level optimization passes are run and then use the callgraph info in a transformation pass which is run just before the vectorizer optimizations. I thought of writing an analysis pass which generates the callgraph using the internal LLVM callgraph class and then use it later in my tranformation pass. Does LLVM have any existing functionality to pass this generated callgraph across passes? Or is there any other way I should go about doing this?

2

Hi rish, you can try to inherit CallGraphWrapperPass with your analysisXXXPass. Then call it with

CallGraph &CG = getAnalysis<analysisXXXPass>().getCallGraph();
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3

Thanks for the solution!