[llvm-commits] [RFC] ExecutionEngine API for adding custom passes

[James Molloy]

Hi,

I have a use case where I have written a MachineFunctionPass, which I
would like to have run on a Module which I will eventually pass to the
MCJIT.

Currently, the only real way I can do this is by compiling the module
twice, because MachineFunctionPasses need to be added to PassManagers
after ::addPassesToEmit* is called, and the MCJIT creates its own
PassManager and calls that locally itself.

It's really inefficient to have to go through the codegen process twice
just because I can't add a pass to what the MCJIT runs, so I've attached
a proposed addition to the ExecutionEngine interface.

This adds a suite of functions to add "compilation hooks". These would
be unimplemented on the Interpreter and old-style JIT. They are function
pointers that a user would give, that take a PassManager& argument and
allow the user to add passes manually.

Is this something that would be acceptable to have in trunk?

Cheers,

James

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