[LLVMdev] Whole program alias analysis in backend

[Jonas Wagner]

Hi,

  I know that backend processes one function at a time,
> is it somehow possible to do there a whole program analysis,
> or could you give me some guidelines?
>

There are different kinds of LLVM passes: Those that process a function at
a time (FunctionPass), but also those that work on the call graph
(CallGraphSCCPass) or on an entire module (ModulePass). These are described
in the Writing an LLVM Pass
<http://llvm.org/docs/WritingAnLLVMPass.html>documentation. For your
purposes, a ModulePass would probably be the best
choice, as it gives you complete freedom. You could also split your
analysis into multiple passes that depend on each other.

Best,
Jonas
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