[LLVMdev] GlobalsModRef

[Jorge A. Navas]

Got it!

Thanks

Jorge

On Saturday, November 19, 2011 at 15:16:52 (+0100), Duncan Sands wrote:
>> Hi Jorge,
>> 
>> > I'm implementing an intra-procedural analysis. For correctness, during
>> > the analysis of each function I need to know which global variables
>> > may be modified by other functions in order to avoid wrong assumptions
>> > about those variables.
>> >
>> > I looked at lib/Analysis/IPA/GlobalsModRef.cpp and it seems that it
>> > does what I want. My problem is that I don't know how to use it ;-(
>> >
>> > I wrote a pass:
>> >
>> >    struct MyPass : public FunctionPass {
>> >      ....
>> >      virtual void getAnalysisUsage(AnalysisUsage&  AU) const {
>> >         AU.addRequired<GlobalsModRef>();
>> >         ...
>> >      }
>> >      ...
>> >    }
>> >
>> > but then I don't know which header file should I include. Otherwise, I
>> > get the obvious error that "GlobalsModRef was not declared in this
>> > scope"
>> >
>> > Sorry because it's a basic question but I looked for any client of
>> > GlobalsModRef in the llvm tree but it seems nobody uses it.
>> 
>> I think the reason for that is that you are supposed to use the generic
>> alias analysis interface.  This then queries any present alias analyses
>> (like GlobalsModRef) for you.
>> 
>> Ciao, Duncan.
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