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 <[email protected]> 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 <[email protected]> > 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 <[email protected]> >> 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 >> > <[email protected]> >> > 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 >> >> <[email protected]> >> >> 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 >> >> > <[email protected]> >> >> > 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 <[email protected]> >> >> >> 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 >> >> >> > <[email protected]> >> >> >> > 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 >> >> >> >> <[email protected]> >> >> >> >> wrote: >> >> >> >>> >> >> >> >>> On 20 September 2013 17:15, Saikat Dutta >> >> >> >>> <[email protected]> >> >> >> >>> 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. >> >> >> >> >> >> >> >> >> >> > >> >> > >> > >> > > > _______________________________________________ klee-dev mailing list [email protected] https://mailman.ic.ac.uk/mailman/listinfo/klee-dev
