[LLVMdev] Dynamic configuration for llvmc2
pcwalton at cs.ucla.edu
Mon Nov 17 10:40:47 PST 2008
Thanks for the reply!
> The plan now is to make this functionality easier to use, so you'll be able to
> just say:
> llvmc2 --load MyPlugin.td MyFile.cpp
> and have llvmc2 build and load MyPlugin.td behind the scenes.
That sounds like a good idea.
Part of the reason I suggested making the system less dependent on
TableGen is that in the process of developing a plugin I've found some
things to be difficult to express in the current framework. For
instance, when parsing options, I've found that often I want to save
some kind of information in a variable and then use that variable when
constructing the command line. This is not possible without hooks, but
hooks are limited in what they can do (they can only do simple string
Basically, my concern with TableGen is that a lot of work has gone into
creating a small domain-specific scripting language in TableGen, when
maybe a real scripting language would be easier to use (not to mention
to maintain), and would have the added benefit of not having to recompile.
How would you feel about a plugin that reads its configuration from an
external specs file written in, say, Lua? It looks like the design of
llvmc2 allows plugins that dynamically set up nodes and edges instead of
statically reading them, and it could be a good solution for drivers
with complex requirements. I could start work on such a thing if you
thought it was a good idea.
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