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Besides, any good context sensitive pointer analysis
should be able to build the call graph on the fly, refining it with the information it is gathering. e.g.: http://llvm.cs.uiuc.edu/pubs/2003-04-29-DataStructureAnalysisTR.html
Note that the biggest limiting factor is going to be lack of whole-program
information.
Without that, you have to treat _direct_ calls just as pessimistically as indirect calls...
but the program-at-a-time stuff in GCC will probably help with this problem.
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