llvm dev - Apr 2010 - [LLVMdev] Inserting a varargs function declaration with getOrInsertFunction()?

I need to insert a varargs function declaration from within an LLVM 
pass.  getOrInsertFunction() allows an arbitrary list of type parameters 
for function arguments to be passed in, but as far as I can tell there 
is no LLVM "type" to represent the variable-length portion of a
function
argument list.  How is this normally done?

--Patrick

On Fri, Apr 23, 2010 at 4:42 PM, Patrick Alexander Simmons
<simmon12 at cs.uiuc.edu> wrote:
> I need to insert a varargs function declaration from within an LLVM
> pass.  getOrInsertFunction() allows an arbitrary list of type parameters
> for function arguments to be passed in, but as far as I can tell there
> is no LLVM "type" to represent the variable-length portion of a
function
> argument list.  How is this normally done?
I am not sure how it is normally done, but I have used
getOrInsertFunction to insert function calls with variable arguments
and FunctionType::get to build my function type. Check out
DerivedTypes.h and look at the get methods (there are options with
isVarArg as a parameter).

Scott

Hi Patrick,
> I need to insert a varargs function declaration from within an LLVM
> pass.  getOrInsertFunction() allows an arbitrary list of type parameters
> for function arguments to be passed in, but as far as I can tell there
> is no LLVM "type" to represent the variable-length portion of a
function
> argument list.  How is this normally done?
when you create a FunctionType you can specify whether it is varargs or not.

Ciao,

Duncan.