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I am trying to write a ModulePass which requires PostDominator sets for every function in the module. Now finding post dominators is a function pass. The link on the llvm.org website says that : "Currently it is illegal for a ModulePass<http://llvm.org/docs/WritingAnLLVMPass.html#ModulePass>to require a FunctionPass <http://llvm.org/docs/WritingAnLLVMPass.html#FunctionPass>.