[llvm-dev] How to generate a .ll file with functions' parameter names

David Chisnall via llvm-dev llvm-dev at lists.llvm.org
Mon Dec 9 03:00:23 PST 2019

Hi Alberto,

Note that even with this, there isn't necessarily a 1:1 correspondence 
between LLVM IR parameters and clang parameters.  For example, a struct 
passed by value in a C function may be one IR parameter per field, or 
may be packed into an integer large enough to store the whole thing. 
Similarly, return values may be indirect via sret pointers or they may 
be explicit return values but of a different type (for example, on i386 
a return of struct of a pair of int- or pointer-sized values may be 
returned as a single i64 in LLVM IR).

It would help to understand what you are trying to do, because there may 
be a better way of achieving your goal.


On 08/12/2019 10:19, Alberto Barbaro via llvm-dev wrote:
> Hi Tim,
> My bad, I have installed a newer version of clang and all worked.
> Thanks
> On Sun, Dec 8, 2019, 10:05 Tim Northover <t.p.northover at gmail.com 
> <mailto:t.p.northover at gmail.com>> wrote:
>     On Sun, 8 Dec 2019 at 09:54, Alberto Barbaro via llvm-dev
>     <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
>      > thanks for your answer. Unfortunately I'm still using llvm 6.0
>     and in llvm-dis I don't see that option. I tried reading the full
>     list of options but I didn't see an alternative.
>     The option is for Clang. Once you have the IR generated it's too late,
>     the names will already have been discarded.
>     Cheers.
>     Tim.
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