[LLVMdev] Non-immutable alias analysis

[Shacham, Ohad]

Hi,

I wrote a module pass that uses Alias Analysis.
For this reason I added AU.addRequired<AliasAnalysis>() to function getAnalysisUsage and used getAnalysis<AliasAnalysis>() in my pass.
I tried a few types of alias analyses and I discovered that only alias analyses which are ImmutablePasses are returned using getAnalysis<AliasAnalysis>(). Moreover, when I added both ImmutablePass and FunctionPass, getAnalysis<AliasAnalysis>() returned the ImmutablePass while the FunctionPass did not even appear in the AA chain ( I assume it is because building the chain uses getAnalysis as well).

Does this feature should be supported?

Thx,
Ohad


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