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<TITLE>RE: [LLVMdev] whether these transformations are doable and how?</TITLE>
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<P><FONT SIZE=2>>> 3. can I modify a function to take extra formal parameters? can I<BR>
>> update all calls of the original function to take extra actual<BR>
>> paramters? The function might be called across multiple modules. It<BR>
>> seems this has to be done at both ModulePass and FunctionPass levels.<BR>
<BR>
> Since this is a global change, use a ModulePass.<BR>
<BR>
> This change is a bit more difficult. First, to add parameters, I<BR>
> believe you can't change the original function; you have to create a<BR>
> new, empty function with the new parameters and then clone the body of<BR>
> the old function into the new function. There's a utility function (I<BR>
> think it's in llvm/lib/Transform/Utils) that helps do this.<BR>
<BR>
>Updating callers is a bit more difficult. Direct callers are easy; just<BR>
<BR>
PIC16 Target does both the things.<BR>
See the PIC16Cloner pass inside lib/Target/PIC16/PIC16Passes directory.<BR>
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- Sanjiv<BR>
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