[LLVMdev] Accessing a custom defined llvm pass

[John Criswell]

On 2/23/15 10:26 PM, Adam Taylor wrote:
> Hello all,
>
> I have written one pass to collect information about specific calls in 
> an llvm IR file and am not trying to reference the results from the 
> first pass in a second pass.
>
> What is the correct way to reference an additional custom pass in 
> LLVM?  At the moment the project is set up under the lib/Transforms 
> directory in source and has the current layout:
>
> Thresholds/
>     include/
>         Thresholds.h
>     Pass1.cpp
>     Pass2.cpp
>     Makefile
>
> Both of the pass classes are defined in the header file. In pass two I 
> have declared that it requires Pass1 using: AU.addRequired<Pass1>() 
> and get the result using
> getAnalysis<Pass1>().getParamPtrs();
>
> The module compiles correctly, but when trying to load it using opt I 
> get an error:
>
> Error opening 'Thresholds.dylib': dlopen(Thresholds.dylib, 9): Symbol 
> not found: __ZN12_GLOBAL__N_115ParamCallFinder2ID
>
> What is the correct way to reference another custom written pass in 
> LLVM?  Is is possible to do it in this manner or am I completly wrong 
> in my approach?

I don't think there's enough information in this email to determine, 
reliably, what the problem is.  That said, I'm guessing that one of your 
passes is named ParamCallFinder.

If I'm correct, make sure that ParamCallFinder::ID is defined in the 
.cpp file that defines the methods for the pass.  Otherwise, the ID will 
be declared but not defined, and you can get a link error like the one 
you're seeing.

I can't be sure, but I suspect that's the problem.

Regards,

John Criswell

>
>
> Thanks!
>
>
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-- 
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
http://www.cs.rochester.edu/u/criswell

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