[klee-dev] Running Multifile Applications using Klee

[Saikat Dutta]

Thanks .. its working  :) ....can the same procedure be followed for
non-GNU applications?



On Sat, Sep 21, 2013 at 5:28 PM, Daniel Liew <daniel.liew at imperial.ac.uk>wrote:

> Oops. I appear to have mislead you. KLEE can execute gzip.bc . The
> problem is by default the gzip build system tells llvm-gcc to optimise
> the code (-O2). You need to tell llvm-gcc to not optimise the code
> (this seems to prevent the llvm.objectsize.*) intrinsic from being
> used. You can do this by forcing the value of CFLAGS at configure time
> like so...
>
> $ cd gzip-1.6
> $ make clean
> $ CC=wllvm CFLAGS="-O0 -g" ./configure
> $ make
> $ extract-bc gzip
>
> Now
> $ klee --libc=uclibc --posix-runtime gzip.bc --help
>
> Works.
>
> Hope that helps.
>
> Dan.
>
> On 21 September 2013 12:01, Saikat Dutta <saikatdutta.pro2011 at gmail.com>
> wrote:
> > Ok....Dead End then....Thanks for your help a lot. You were very patient
> > throughout. Let me know if theres any development in this !
> > Thanks.
> > -Saikat
> >
> >
> > On Sat, Sep 21, 2013 at 4:25 PM, Daniel Liew <daniel.liew at imperial.ac.uk
> >
> > wrote:
> >>
> >> One possible workaround is to use an older version of LLVM and
> >> llvm-gcc (I think you would need to use llvm-2.6) that doesn't
> >> generate that intrinsic. I give no guarantees that this would work as
> >> I have not tried using KLEE with this older version.
> >>
> >> I've added an issue to the KLEE issue tracker on your behalf (
> >> https://github.com/ccadar/klee/issues/33 ). There are no guarantees
> >> that this will be fixed.
> >>
> >> If you need this to work **now** you need to implement support for
> >> this intrinsic yourself.
> >>
> >> On 21 September 2013 11:42, Saikat Dutta <saikatdutta.pro2011 at gmail.com
> >
> >> wrote:
> >> > I got the same message:
> >> > LLVM ERROR: Code generator does not support intrinsic function
> >> > 'llvm.objectsize.i32'!
> >> > So theres no existing solution to this?
> >> >
> >> >
> >> > On Sat, Sep 21, 2013 at 3:40 PM, Daniel Liew
> >> > <daniel.liew at imperial.ac.uk>
> >> > wrote:
> >> >>
> >> >> You're done. gzip.bc is a single LLVM module that is equivalent to
> the
> >> >> gzip binary. Now you just need to run KLEE on it.
> >> >>
> >> >> e.g.
> >> >>
> >> >> $ klee --libc=uclibc --posix-runtime gzip.bc --help
> >> >> KLEE: NOTE: Using model:
> >> >>
> /data/dev/KLEE/klee/bin-dbg/Release+Asserts/lib/libkleeRuntimePOSIX.bca
> >> >> KLEE: output directory = "klee-out-1"
> >> >> LLVM ERROR: Code generator does not support intrinsic function
> >> >> 'llvm.objectsize.i64'!
> >> >>
> >> >> I should note that this does not work on my machine because of
> missing
> >> >> support for a particular LLVM intrinsic function. You'll need to add
> >> >> support for it:
> >> >> http://llvm.org/docs/LangRef.html#llvm-objectsize-intrinsic
> >> >>
> >> >> A developer recently added support for another intrinsic so you could
> >> >> use this as an example ( https://github.com/ccadar/klee/pull/27 )
> >> >>
> >> >> If you get it working please consider contributing your code back to
> >> >> the project so others can benefit.
> >> >>
> >> >> Thanks,
> >> >> Dan Liew.
> >> >>
> >> >>
> >> >> On 21 September 2013 10:36, Saikat Dutta
> >> >> <saikatdutta.pro2011 at gmail.com>
> >> >> wrote:
> >> >> > I upgraded to python 2.7
> >> >> > "extract-bc gzip" produced gzip.bc
> >> >> > what to do next?
> >> >> >
> >> >> >
> >> >> > On Sat, Sep 21, 2013 at 2:20 PM, Daniel Liew
> >> >> > <daniel.liew at imperial.ac.uk>
> >> >> > wrote:
> >> >> >>
> >> >> >> Oh I forgot to mention that if you really don't feel like
> upgrading
> >> >> >> you could just modify the extract-bc python script by removing the
> >> >> >> use
> >> >> >> of argparse from the main() function and setting
> >> >> >>
> >> >> >> inputFile = sys.argv[1]
> >> >> >>
> >> >> >> On 20 September 2013 17:58, Daniel Liew <
> daniel.liew at imperial.ac.uk>
> >> >> >> wrote:
> >> >> >> > Your python install is too old (the argparse module was
> introduced
> >> >> >> > in
> >> >> >> > python2.7) you need python 2.7 or later. You can find your
> current
> >> >> >> > python version by running
> >> >> >> >
> >> >> >> > $ python --version
> >> >> >> >
> >> >> >> > I think you said you were using Ubuntu 10.04 in which case the
> >> >> >> > python
> >> >> >> > version is probably 2.6.5 . Unless you have a good reason to be
> >> >> >> > running such an old version of python (or Ubuntu for that
> matter)
> >> >> >> > you
> >> >> >> > should upgrade.
> >> >> >> >
> >> >> >> >
> >> >> >> > On 20 September 2013 17:50, Saikat Dutta
> >> >> >> > <saikatdutta.pro2011 at gmail.com>
> >> >> >> > wrote:
> >> >> >> >> Hi,
> >> >> >> >> At the "extract-bc gzip" stage following error is produced:
> >> >> >> >>
> >> >> >> >> Traceback (most recent call last):
> >> >> >> >>   File
> >> >> >> >>
> >> >> >> >>
> >> >> >> >>
> >> >> >> >>
> "/home/saikat/Downloads/llvm_new/whole-program-llvm-llvm-gcc/extract-bc",
> >> >> >> >> line 269, in <module>
> >> >> >> >>     sys.exit(main(sys.argv))
> >> >> >> >>   File
> >> >> >> >>
> >> >> >> >>
> >> >> >> >>
> >> >> >> >>
> "/home/saikat/Downloads/llvm_new/whole-program-llvm-llvm-gcc/extract-bc",
> >> >> >> >> line 212, in main
> >> >> >> >>     import argparse
> >> >> >> >> ImportError: No module named argparse
> >> >> >> >>
> >> >> >> >>
> >> >> >> >>
> >> >> >> >>
> >> >> >> >>
> >> >> >> >>
> >> >> >> >> On Fri, Sep 20, 2013 at 10:09 PM, Daniel Liew
> >> >> >> >> <daniel.liew at imperial.ac.uk>
> >> >> >> >> wrote:
> >> >> >> >>>
> >> >> >> >>> On 20 September 2013 17:15, Saikat Dutta
> >> >> >> >>> <saikatdutta.pro2011 at gmail.com>
> >> >> >> >>> wrote:
> >> >> >> >>> > Hi,
> >> >> >> >>> > Everything goes fine with wllvm according to the way you
> >> >> >> >>> > described
> >> >> >> >>> > in
> >> >> >> >>> > the
> >> >> >> >>> > previous mail. No errors till make step.
> >> >> >> >>>
> >> >> >> >>> If you don't tell us what the errors are we will **not** be
> able
> >> >> >> >>> to
> >> >> >> >>> help you. If you see an error tell us what it is.
> >> >> >> >>>
> >> >> >> >>> > But instead of "gzip.bc" or
> >> >> >> >>> > "gzip.o.bc" , ".gzip.o.bc" is being formed.
> >> >> >> >>>
> >> >> >> >>> .gzip.o.bc is a LLVM bitcode file that corresponds to the
> gzip.o
> >> >> >> >>> object file (this mostly likely corresponds with gzip.c) . It
> is
> >> >> >> >>> **not** the finally linked executable. You are only supposed
> to
> >> >> >> >>> run
> >> >> >> >>> extract-bc on the the finally linked executable (or on static
> >> >> >> >>> libraries) **not** on object files.
> >> >> >> >>>
> >> >> >> >>> I just tried this and it works fine. You should run extract-bc
> >> >> >> >>> on
> >> >> >> >>> the
> >> >> >> >>> "gzip" executable.
> >> >> >> >>>
> >> >> >> >>> # I assume you have llvm-gcc in your path and it was the
> >> >> >> >>> pre-built
> >> >> >> >>> binary llvm-gcc 4.2
> >> >> >> >>>
> >> >> >> >>> $ export LLVM_COMPILER=llvm-gcc
> >> >> >> >>> $ export WLLVM_OUTPUT=WARNING
> >> >> >> >>> $ export
> >> >> >> >>>
> >> >> >> >>>
> >> >> >> >>>
> LLVM_COMPILER_PATH=/your/path/to/the/llvm2.9/build/Release+Asserts/bin
> >> >> >> >>> $ wget http://ftp.gnu.org/gnu/gzip/gzip-1.6.tar.xz
> >> >> >> >>> $ tar -xvf gzip-1.6.tar.xz
> >> >> >> >>> $ cd gzip-1.6
> >> >> >> >>> $ CC=wllvm ./configure
> >> >> >> >>> $ make -j4
> >> >> >> >>> $ extract-bc gzip
> >> >> >> >>>
> >> >> >> >>> # gzip.bc will now be in the current directory
> >> >> >> >>>
> >> >> >> >>> > When I use extract bc on it,
> >> >> >> >>> > error is generated. Please help.
> >> >> >> >>> > -Saikat
> >> >> >> >>>
> >> >> >> >>> Again... If there is an error message tell us what it is.
> >> >> >> >>>
> >> >> >> >>> Hope that helps.
> >> >> >> >>>
> >> >> >> >>> Dan.
> >> >> >> >>
> >> >> >> >>
> >> >> >
> >> >> >
> >> >
> >> >
> >
> >
>
-------------- next part --------------
HTML attachment scrubbed and removed