[LLVMdev] How to create arguments CallInst

[John Criswell]

On 10/6/11 11:48 AM, Rafael Baldiati Parizi wrote:
> Hello,
> I need create a CallInst to this function
>
> define i32 @function(i32 %n, i8 %m){ ... }
>
> I now how get argument's type but I do not know how to create 
> arguments that meet these types.
> For example, if the argument is long, accurate pass CallInst an 
> integer argument, however, if a Char, Char must pass an argument.
> How to get the type of the argument of the function definition and 
> create the same type to pass the Callinst???

If you want to pass a value to a function that doesn't match the type, 
you will need to insert a cast instruction to cast the value to the 
correct type.  Which cast instruction you insert will depend on the 
value's type and the type you want it to be.

SAFECode has a utility function castTo() that takes a Value * and a 
desired Type * and inserts a cast instruction if Value * is not of the 
desired type.  It's designed to minimize the number of cast instructions 
it inserts so that the resulting LLVM IR is more readable for debugging:

http://llvm.org/viewvc/llvm-project/safecode/trunk/include/safecode/Utility.h?view=markup

-- John T.

>
>
> -- 
> */Rafael Parizi/*
>
>
>
>
>
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