[cfe-users] Getting variable names in LLVM IR
Hi,
I'm a newbie in LLVM environment.
I'm trying to generate the LLVM IR of a c file using clang. The command
line argument I'm passing is as :
"clang -O0 -S -emit-llvm test.c -c -o test.ll"
It is generating the LLVM IR properly but I'm not getting the variable
names. e.g,
for the c file :
#include
int main()
{
int x;
int y;
x = 2;
y =4;
int z = x*y;
if(x==y)
{
z = x*y;
return z;
} else
{
z = x+y;
}
printf("z = %d", z);
return 0;
}
the corresponding llvm IR is :
; Function Attrs: nounwind uwtable
define i32 @main() #0 {
%1 = alloca i32, align 4
%2 = alloca i32, align 4
%3 = alloca i32, align 4
%4 = alloca i32, align 4
store i32 0, i32* %1, align 4
store i32 2, i32* %2, align 4
store i32 4, i32* %3, align 4
%5 = load i32, i32* %2, align 4
%6 = load i32, i32* %3, align 4
%7 = mul nsw i32 %5, %6
store i32 %7, i32* %4, align 4
%8 = load i32, i32* %2, align 4
%9 = load i32, i32* %3, align 4
%10 = icmp eq i32 %8, %9
br i1 %10, label %11, label %16
; :11: ; preds = %0
%12 = load i32, i32* %2, align 4
%13 = load i32, i32* %3, align 4
%14 = mul nsw i32 %12, %13
store i32 %14, i32* %4, align 4
%15 = load i32, i32* %4, align 4
store i32 %15, i32* %1, align 4
br label %21
; :16: ; preds = %0
%17 = load i32, i32* %2, align 4
%18 = load i32, i32* %3, align 4
%19 = add nsw i32 %17, %18
store i32 %19, i32* %4, align 4
br label %20
; :20: ; preds = %16
store i32 0, i32* %1, align 4
br label %21
; :21: ; preds = %20, %11
%22 = load i32, i32* %1, align 4
ret i32 %22
}
I wanted to get the variables in their original name i.e, x,y,z instead
of %1,%2,%3, etc.
Is it possible to do so?
Thanks.
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Re: [cfe-users] .deb package for LibC++
Eric, I'd be happy to do this work. However, I have no experience with developing LLVM / Clang / LibC++, so I'll need some mentoring. I do have some experience on creating Debian packages though, from a few years back. Let me know how we should proceed with this. For start, where shall I start looking at how Clang packages are created and deployed to apt.llvm.org ? Cheers, M. On Mon, Feb 13, 2017 at 3:18 PM Eric Fiselier wrote: > I don't know about any .deb packages for libc++, but I sure would > appreciate somebody working on it :-) > > /Eric > > On Mon, Feb 13, 2017 at 10:25 AM, Duncan P. N. Exon Smith < > dexonsm...@apple.com> wrote: > > +Eric > > Eric, do you know? > > On 2017-Feb-12, at 13:43, Michal Jaszczyk via cfe-users < > cfe-users@lists.llvm.org> wrote: > > Hey, > > I'm trying to set up my Ubuntu Yakkety dev environment to use Clang and > LibC++. > > I'm trying to use Clang 4.0. It is not available in Yakkety by default, > but http://apt.llvm.org/ conveniently offers an Apt repository to get the > right package. I was able to use that and get Clang 4.0 pretty smoothly. > > Similarly, I'd like to use LibC++ 4.0. Yakkety offers 3.7 by default, and > it is actually broken. However, it seems that apt.llvm.org does not > provide .deb packages for LibC++. Is there anywhere I could find them? > > If none exist, how hard would it be to add them? I'd be willing to spend > some time trying to make this happen. > > Cheers, > > M. > > ___ > cfe-users mailing list > cfe-users@lists.llvm.org > http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-users > > > > ___ cfe-users mailing list cfe-users@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-users
Re: [cfe-users] .deb package for LibC++
I don't know about any .deb packages for libc++, but I sure would appreciate somebody working on it :-) /Eric On Mon, Feb 13, 2017 at 10:25 AM, Duncan P. N. Exon Smith < dexonsm...@apple.com> wrote: > +Eric > > Eric, do you know? > > On 2017-Feb-12, at 13:43, Michal Jaszczyk via cfe-users < > cfe-users@lists.llvm.org> wrote: > > Hey, > > I'm trying to set up my Ubuntu Yakkety dev environment to use Clang and > LibC++. > > I'm trying to use Clang 4.0. It is not available in Yakkety by default, > but http://apt.llvm.org/ conveniently offers an Apt repository to get the > right package. I was able to use that and get Clang 4.0 pretty smoothly. > > Similarly, I'd like to use LibC++ 4.0. Yakkety offers 3.7 by default, and > it is actually broken. However, it seems that apt.llvm.org does not > provide .deb packages for LibC++. Is there anywhere I could find them? > > If none exist, how hard would it be to add them? I'd be willing to spend > some time trying to make this happen. > > Cheers, > > M. > > ___ > cfe-users mailing list > cfe-users@lists.llvm.org > http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-users > > > ___ cfe-users mailing list cfe-users@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-users
Re: [cfe-users] Getting variable names in LLVM IR
> On 2017-Feb-13, at 23:10, Subhendu Malakar via cfe-users
> wrote:
>
> Hi,
> I'm a newbie in LLVM environment.
>
> I'm trying to generate the LLVM IR of a c file using clang. The command line
> argument I'm passing is as :
> "clang -O0 -S -emit-llvm test.c -c -o test.ll"
If you add "-###" to the end of the command-line you can see the raw -cc1
command for the compilation. Depending on your version of clang, you should
see "-discard-value-names" in there. If you repeat the -cc1 command yourself,
skipping that option, you'll get variable names.
If you're compiling clang yourself (it doesn't sound like you are, but just in
case), this -discard-value-names option is *not* passed by default in asserts
builds.
>
> It is generating the LLVM IR properly but I'm not getting the variable names.
> e.g,
>
> for the c file :
> #include
>
> int main()
> {
>int x;
>int y;
>x = 2;
>y =4;
>int z = x*y;
>
>if(x==y)
>{
>z = x*y;
>return z;
>} else
>{
>z = x+y;
>}
>printf("z = %d", z);
>return 0;
> }
>
>
> the corresponding llvm IR is :
>
> ; Function Attrs: nounwind uwtable
> define i32 @main() #0 {
> %1 = alloca i32, align 4
> %2 = alloca i32, align 4
> %3 = alloca i32, align 4
> %4 = alloca i32, align 4
> store i32 0, i32* %1, align 4
> store i32 2, i32* %2, align 4
> store i32 4, i32* %3, align 4
> %5 = load i32, i32* %2, align 4
> %6 = load i32, i32* %3, align 4
> %7 = mul nsw i32 %5, %6
> store i32 %7, i32* %4, align 4
> %8 = load i32, i32* %2, align 4
> %9 = load i32, i32* %3, align 4
> %10 = icmp eq i32 %8, %9
> br i1 %10, label %11, label %16
>
> ; :11: ; preds = %0
> %12 = load i32, i32* %2, align 4
> %13 = load i32, i32* %3, align 4
> %14 = mul nsw i32 %12, %13
> store i32 %14, i32* %4, align 4
> %15 = load i32, i32* %4, align 4
> store i32 %15, i32* %1, align 4
> br label %21
>
> ; :16: ; preds = %0
> %17 = load i32, i32* %2, align 4
> %18 = load i32, i32* %3, align 4
> %19 = add nsw i32 %17, %18
> store i32 %19, i32* %4, align 4
> br label %20
>
> ; :20: ; preds = %16
> store i32 0, i32* %1, align 4
> br label %21
>
> ; :21: ; preds = %20, %11
> %22 = load i32, i32* %1, align 4
> ret i32 %22
> }
>
>
> I wanted to get the variables in their original name i.e, x,y,z instead of
> %1,%2,%3, etc.
> Is it possible to do so?
>
> Thanks.
> ___
> cfe-users mailing list
> cfe-users@lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-users
___
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