[LLVMdev] Strategy to compile for LLVM IR

[Chris Lattner]

On Fri, 15 Jun 2007, [ISO-8859-1] Stéphane Letz wrote:
> We have a compiler for the Faust language (faust.grame.fr) that
> currently compiles a C++ class which implements a DSP plug-in with
> several methods.

BTW, since you are fast becoming a guru in code specialization with LLVM, 
it would be really nice if you could write a little document that captures 
some of this wisdom for the next person :)

-Chris


> Our strategy to compile LLVM IR instead is the following:
>
> - use the current Faust ==> C++ compiler to compile a "empty" plug-in
> that we use as a template C++ class.
>
> - compile this  template C++ class using "llvm-g++  -emit-llvm -c "
> to get a bytecode file template.bc
>
> - use "llvm2cpp  template.bc" to get a  template.bc.cpp  of  C++ code
> the Faust ==> LLVM IR  new backend will have to execute to produce
> the correct bytecode.
>
> - take this template.bc.cpp code as the "constant" part of the Faust
> ==> LLVM IR backend and add everything needed to produce the
> "variable" part (that one corresponding to what the real Faust plug-
> in will do)
>
> This method should work but is a bit complex, since we have to look
> at the template.bc.cpp code, find the "entry points" (Function* or
> BadsicBlock* objects) we will have to enrich with additional code.
>
> Is there any more common and simple method to achieve the same
> result? or any other advice?
>
> Thanks
>
> Stephane Letz
>
>
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-Chris

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