[llvm-dev] Get arguments of a function (bitcast)

[Manuel Jacob via llvm-dev]

Hi Mo,

Have a look at the Value::stripPointerCasts() method [1] to strip all 
bitcasts from the function pointer.

-Manuel

[1] 
http://llvm.org/docs/doxygen/html/classllvm_1_1Value.html#a38ea12c04523d63adda732b9c5d6da0a

On 2016-01-12 16:43, Mohammad Norouzi via llvm-dev wrote:
> Hi All,
> 
> I need to get the list of arguments of a function which is bitcasted.
> 
> Here is the C code excerpt:
> 
> main()
> {
>  .....
> 
>   /* Get input samples */
>   input_dsp(input, N, 1);
> 
> .....
> }
> 
> and here is llvm ir for the code section:
> 
> %call = call i32 (i32*, i32, i32, ...)* bitcast (i32 (...)* @input_dsp 
> to
> i32 (i32*, i32, i32, ...)*)(i32* getelementptr inbounds ([256 x i32]*
> @input, i32 0, i32 0), i32 256, i32 1)
> 
> 
> When I use the ordinary method for getting arguments,
> 
> for (Function::ArgumentListType::iterator it =
> f->getArgumentList().begin(); it != f->getArgumentList().end(); it++) 
> {...}
> 
> i get a segmentation fault which i think i valid. But how can i get
> arguments of *input_dsp* which are *input*, *N* and *1* in this case.
> 
> Best,
> Mo
> 
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev