llvm dev - Jan 2019 - How to generate .bc file using configure && make on Mac OS X?

I did a sanity check and run some of the bitcode I complied with gllvm and
it seems to work fine under lli. The only issues is to make sure you load
all the (external) libraries the bitcode needs. I highly suggest you run a
debug version of lli under a debugger and see what exactly happens.

On Mon, Jan 28, 2019 at 12:45 PM Peng Yu <pengyu.ut at gmail.com> wrote:
> It seems that it does not really work. When I run the generated .bc
> file, it gives me the following error. Do you what is wrong?
>
> $ lli bash.bc
> Stack dump:
> 0.    Program arguments: lli bash.bc
> 0  lli                      0x0000000105153922
> llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 37
> 1  lli                      0x0000000105153d26 SignalHandler(int) + 200
> 2  libsystem_platform.dylib 0x00007fff7d6daf5a _sigtramp + 26
> 3  libsystem_platform.dylib 0x00007ffeeb06cb20 _sigtramp + 1838750688
> 4  lli                      0x0000000104ed5045
> llvm::MCJIT::runFunction(llvm::Function*,
> llvm::ArrayRef<llvm::GenericValue>) + 535
> 5  lli                      0x0000000104e67ae7
> llvm::ExecutionEngine::runFunctionAsMain(llvm::Function*,
> std::__1::vector<std::__1::basic_string<char,
> std::__1::char_traits<char>, std::__1::allocator<char> >,
> std::__1::allocator<std::__1::basic_string<char,
> std::__1::char_traits<char>, std::__1::allocator<char> >
> > const&,
> char const* const*) + 1159
> 6  lli                      0x0000000104b94b84 main + 9104
> 7  libdyld.dylib            0x00007fff7d3cc015 start + 1
> Segmentation fault: 11
>
> On Mon, Jan 28, 2019 at 10:40 AM Jakub (Kuba) Kuderski
> <kubakuderski at gmail.com> wrote:
> >>
> >> but doesn't emit optnone and nounwind attributes
> >
> > s/nounwind/noinline
> >
> > On Mon, Jan 28, 2019 at 11:35 AM Jakub (Kuba) Kuderski <
> kubakuderski at gmail.com> wrote:
> >>
> >> As far as I understand, gllvm doesn't run LTO pipeline or any
> cross-module optimization, and the optimization level provided is only used
> to compile each Translation Unit separately.
> >> If you want to have LTO-like build, you can first run gllvm with
`-O3
> -Xclang -disable-llvm-optzns` (builds code with no optimizations, but
> doesn't emit optnone and nounwind attributes) and later run opt on the
> final bitcode. Note that the results might not be the same as running a
> proper LTO build because of different pass manager pipelines.
> >>
> >> On Mon, Jan 28, 2019 at 11:24 AM Peng Yu <pengyu.ut at
gmail.com> wrote:
> >>>
> >>> This works great.
> >>>
> >>> > You can also try using the gllvm wrapper:
> https://github.com/SRI-CSL/gllvm ; it's quite reliable and easy to use
in
> my experience.
> >>>
> >>> Just to be sure. Only one version of bc file will be generated
that
> >>> corresponds to the compiler options provide at configure?
> >>>
> >>> The original approach using ld.gold will provide several .bc
files
> >>> that correspond to different stages of the optimization.
> >>>
> >>> I think using gllvm, I need to specify the corresponding -O?
option to
> >>> the correct optimization stage of the bc file? Thanks.
> >>>
> >>> --
> >>> Regards,
> >>> Peng
> >>
> >>
> >>
> >> --
> >> Jakub Kuderski
> >
> >
> >
> > --
> > Jakub Kuderski
>
>
>
> --
> Regards,
> Peng
>

-- 
Jakub Kuderski
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Could you try the bash source code to see if you see the same errors?
It should just take a few minutes to configure/compile. Thanks.

https://ftp.gnu.org/gnu/bash/bash-5.0.tar.gz
> I did a sanity check and run some of the bitcode I complied with gllvm and
it seems to work fine under lli. The only issues is to make sure you load all
the (external) libraries the bitcode needs. I highly suggest you run a debug
version of lli under a debugger and see what exactly happens.
-- 
Regards,
Peng

It did work for me with llvm-5.0. I don't have time run it on newer
versions.

```
wget https://ftp.gnu.org/gnu/bash/bash-5.0.tar.gz
tar xvf bash-5.0.tar.gz
cd bash-5.0
mkdir build; cd build
export LLVM_COMPILER_PATH=my_llvm_dir/bin
export CC=gclang
export CXX=gclang++
../configure
make -j32
for i in $(find . -executable -and -type f) ; do echo $i ; extract-bc $i ;
done
lli bash.bc -c "echo 'test''"
```

On Mon, Jan 28, 2019 at 1:44 PM Peng Yu <pengyu.ut at gmail.com> wrote:
> Could you try the bash source code to see if you see the same errors?
> It should just take a few minutes to configure/compile. Thanks.
>
> https://ftp.gnu.org/gnu/bash/bash-5.0.tar.gz
>
> > I did a sanity check and run some of the bitcode I complied with gllvm
> and it seems to work fine under lli. The only issues is to make sure you
> load all the (external) libraries the bitcode needs. I highly suggest you
> run a debug version of lli under a debugger and see what exactly happens.
>
> --
> Regards,
> Peng
>

-- 
Jakub Kuderski
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