[llvm-dev] Passes interaction running on two different IRs

[Yingtong Liu via llvm-dev]

Hi all,

I am trying to run two llvm passes on two different IRs to finish my
analysis. These two passes need to exchange information during their
excecution. I am doing so because I can't link the two IRs I want to
analyze together as a big IR and run my llvm pass on it.

What I want to do specifically is:

The first IR will call the functions in the second IR. Whenver there is a
function call in the first IR to the second IR, the first pass will evoke
the second pass on the second IR and give it some information as input.
When the second pass is finished analysing its IR, it will return some
information to the first pass.

Basically, I want to do the same analysis for two IRs just like they were
linked together. Since I can't actually link them togther, I need to manage
the communication between two passes running on two IRs by myself.

I feel like to do so, I need to write another program to control these two
passes, pretty like what the opt program does. But I am not sure if it is
durable and feel overwhemled to start. Anyone can give me any suggestions
about this? Thank you very much.

Best,
Ying
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