[LLVMdev] Pass Ordering

[aparna kotha]

I am using opt , so i cm confused if i need to do this. On the other hand I
modified my functionPass not to call TargetData , and I still get this
error. My functionPass still calls Alias Analysis though.



Aparna

On Fri, Aug 13, 2010 at 2:15 PM, John Criswell <criswell at illinois.edu>wrote:

> aparna kotha wrote:
>
>> All,
>> I have a ModulePass (A) calling a FunctionPass that inturn calls
>> TargetData (a ModulePass). For reasons of code correctness and modularity I
>> cannot reorganize my passes in any other way .
>> When I use opt to load and run A , it gives the following error.
>> LLVM ERROR: Bad TargetData ctor used.  Tool did not specify a TargetData
>> to use?
>>
>>
>> I gather from some previous emails that this was not supported. Is it
>> still not supported? and is there any way I can avoid this.
>>
>
> For some reason, the TargetData pass must use a special constructor method
> that gives it a reference to the module to be analyzed.  This means that
> declaring it as a dependency in your getAnalysisUsage() methods isn't
> enough; whatever program is adding your passes to the PassManager must add
> TargetData explicitly as one of the passes to run.
>
> The opt program does this automatically, so I'm assuming you're writing
> your own tool that creates a PassManager and tells it to run some passes.
>  You want to add code like the following to your tool:
>
> PassManager Passes;   // This line probably exists in your code already
>
> // Explicitly schedule the TargetData pass as the first pass to run; note
> that M.get() gets a pointer or reference
> // to the module to analyze
> Passes.add(new TargetData(M.get()));
>
> -- John T.
>
>
>
>
>
>>
>>
>>
>>
>> Thanks and Regards
>>
>>
>> Aparna Kotha
>> Graduate Student University of Maryland, College Park
>>
>
>
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