[LLVMdev] Extending FunctionType

[John Criswell]

On 2/28/11 6:31 AM, Gabriel Rodríguez wrote:
> Hi all,
>
> I am trying to extend a FunctionType to include new parameters. In 
> particular, I want to
> ensure that the main function has been declared with both argsc and 
> argsv. However
> there seems to be no easy way to accomplish this: 
> llvm::Function::getFunctionType() returns a
> a reference to a const object, while modifying only the argument list 
> yields an error during verification
> since the function type does not match its arguments. Is there any 
> approach that I am missing or
> a simple workaround to this problem?

If I understand correctly, you are trying to add a parameter to the 
main() function, correct?

If so, then you can't just modify the existing main() function.  
Instead, you have to create a new function with an empty function body 
with the new parameter and then clone the body of the old main() 
function into the new main() function.

There is code to do that in the poolalloc project.  Check out 
http://llvm.org/svn/llvm-project/poolalloc/trunk and look for the code 
that does this in lib/PoolAllocate/PoolAllocate.cpp in the 
MakeFunctionClone() method.

-- John T.

>
> Thanks in advance, and best regards,
> Gabriel

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