[LLVMdev] Printing Function Arguments

[ivtm]

Hi Nick,

Thanks, that seemed to work.


Nick Lewycky wrote:
> 
> ivtm wrote:
>> I am processing the LLVM instructions and right now I am at the 'call'
>> instruction.
>> For now I just want to print the argument type.
>> 
>> For example in the following:
>> 
>> 	%0 = tail call i32 (...)* @__FFF (i32 8) nounwind; <i32> [#uses=1]
>> 
>> I need to get access to 'i32' and '8' separately.
>> 
>> I do:
>> 
>> CallInst *CI = dyn_cast<CallInst>(I);  
>> Value *v = CI->getOperand(1)
>> 
>> I can get the type via v->getType() and that returns 'i32', which is
>> good.
>> 
>> But I also need to get the value '8'.
>> 
>> I can get it via v->getValueID(), but in the documentation it says not to
>> use that function.
> 
> Heh. No, getValueID() returns '8' as the "ConstantIntVal" enum, not the 
> actual argument number.
> 
>> Any other ideas what is the proper way to access the value '8' ?
> 
> It's a ConstantInt, so cast it and retrieve the APInt then pull out the 
> number. Here:
> 
>    unsigned val;
>    if (ConstantInt *CI = dyn_cast<ConstantInt>(v)) {
>      val = CI->getValue()->getSExtValue();
>    }
> 
> Nick
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> 

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