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

Hi Hideto,
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.

Do you have any suggestions?

Thanks
Alberto

Il giorno dom 8 dic 2019 alle ore 08:50 Hideto Ueno <
uenoku.tokotoko at gmail.com> ha scritto:
> Hi Alberto,
>
> Variable names in LLVM IR are meaningless and only used for debugging.
> However, if you want to preserve the variable name, you can use
> `-fno-discard-value-names` option.
>
> Regards,
> Hideto
>
> 2019年12月8日(日) 17:38 Alberto Barbaro via llvm-dev <llvm-dev at
lists.llvm.org
> >:
>
>> Hi all,
>> I'm trying to obtain a .ll with parameters name for every function.
My
>> simple c C is the following:
>>
>> int sum(int a, int b) {
>> return a+b;
>> }
>>
>> int main() {
>> sum(1,2);
>> }
>>
>> I obtain the .ll with the following commands:
>>
>> clang -emit-llvm sum.c -c
>> llvm-dis-7 sum.bc
>>
>> The obtained .ll is:
>>
>> cat sum.ll
>> ; ModuleID = 'sum.bc'
>> source_filename = "sum.c"
>> target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
>> target triple = "x86_64-pc-linux-gnu"
>>
>> ; Function Attrs: noinline nounwind optnone uwtable
>> define i32 @sum(i32, i32) #0 {
>>   %3 = alloca i32, align 4
>>   %4 = alloca i32, align 4
>>   store i32 %0, i32* %3, align 4
>>   store i32 %1, i32* %4, align 4
>>   %5 = load i32, i32* %3, align 4
>>   %6 = load i32, i32* %4, align 4
>>   %7 = add nsw i32 %5, %6
>>   ret i32 %7
>> }
>>
>> ; Function Attrs: noinline nounwind optnone uwtable
>> define i32 @main() #0 {
>>   %1 = call i32 @sum(i32 1, i32 2)
>>   ret i32 0
>> }
>>
>> attributes #0 = { noinline nounwind optnone uwtable
>> "correctly-rounded-divide-sqrt-fp-math"="false"
>> "disable-tail-calls"="false"
"less-precise-fpmad"="false"
>> "no-frame-pointer-elim"="true"
"no-frame-pointer-elim-non-leaf"
>> "no-infs-fp-math"="false"
"no-jump-tables"="false"
>> "no-nans-fp-math"="false"
"no-signed-zeros-fp-math"="false"
>> "no-trapping-math"="false"
"stack-protector-buffer-size"="8"
>> "target-cpu"="x86-64"
"target-features"="+fxsr,+mmx,+sse,+sse2,+x87"
>> "unsafe-fp-math"="false"
"use-soft-float"="false" }
>>
>> !llvm.module.flags = !{!0}
>> !llvm.ident = !{!1}
>>
>> !0 = !{i32 1, !"wchar_size", i32 4}
>> !1 = !{!"clang version 6.0.1-svn334776-1~exp1~20190309042703.125
>> (branches/release_60)"}
>>
>> Could you tell me why I don't see a and b parameters for the sum
function?
>>
>> Thanks
>> Alberto
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>
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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.

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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