[LLVMbugs] [Bug 760] NEW: Passes should use getAnalysisToUpdate<TargetData>(), not getAnalysis<TargetData>()

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=760

           Summary: Passes should use getAnalysisToUpdate<TargetData>(), not
                    getAnalysis<TargetData>()
           Product: libraries
           Version: 1.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Scalar Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sabre at nondot.org


Currently various passes (e.g. Mem2Reg, instcombine, etc) *require* the presence of a TargetData 
instance in the PassManager.  If the TargetData instance isn't added when the PM is started up, the pass 
manager explodes when these passes are added.

This is badness.  Instead, the passes should use getAnalysisToUpdate<TargetData>(), and gracefully 
degrade their functionality if a TargetData isn't around.  While we're at it, we should rename 
getAnalysisToUpdate<> to getAnalysisOrNull<>.

This is useful for tools (e.g. language front-ends) that want to do target-independent transformations 
on LLVM bytecodes without tying them to a particular target.  This isn't important for the C family of 
front-ends.

-Chris



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