[LLVMdev] How can a pass obtain the path of input file?

[xiaoyaollvm]

 Hi all
I write a pass, which will link two module together,
Is there some method that I can obtain the path of the input file?
If so, I can get the module by the path of the input.

Or Is there some method that I can obtain the two modules of the input file by opt?

Thanks,
yaoxiao
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