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Alberto Barbaro via llvm-dev

2019-Dec-08 08:38 UTC

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

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
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Hideto Ueno via llvm-dev

2019-Dec-08 08:50 UTC

head link

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

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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Alberto Barbaro via llvm-dev

2019-Dec-08 09:54 UTC

head link

[llvm-dev] 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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