llvm dev - Dec 2019 - How to generate a .ll file with functions' parameter names

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>
wrote:
> On Sun, 8 Dec 2019 at 09:54, Alberto Barbaro via llvm-dev
> <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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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.

David


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.
> 
> 
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>

Hi David,
Thanks for your email. I'm just trying to perform some basic analysis on
the IR. For instance, is it possible to understand if the variable %10
depends on the value of the first parameter? I know that the first
parameter can be referenced as %0 but a proper name would increase the
readability. It is not so crucial for me atm.

Thanks
Alberto

On Mon, Dec 9, 2019, 11:01 David Chisnall via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> 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.
>
> David
>
>
> 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.
> >
> >
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> >
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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