[LLVMdev] Function Type and Argument List

[Chris Lattner]

On Jan 2, 2009, at 3:47 PM, kapil anand wrote:

> Hi all,
>
> I am having some problem using the Function class. For my  
> application, FunctionType is not known at the time I initialize the  
> function. So, I just initialize the Function as return type
> void with no arguments. As I work on my function, I get to know the  
> arguments and I insert the arguments in ArgumentList data structure  
> of the function. The FunctionType is defined as const and I can't  
> change that.
>
> When I insert a call to this function, I look at ArgumentList Data  
> structure, and determine the number of arguments and pass them with  
> the call. But, FunctionType is same as original type( with no  
> arguments). The insertion of Call Instruction checks the  
> functiontype and gives me an assertion failure that I am calling the  
> function with wrong type.
>
> So, is there any way I can modify the functiontype after  
> initializing the function?

Nope, all LLVM IR objects have a fixed type on construction.  To  
change the type of a function, instruction, etc you have to make a new  
one.

-Chris