[LLVMdev] Debugging using gdb

Pranav Garg pranav.garg2107 at gmail.com
Mon Apr 19 22:16:05 PDT 2010

Hi John,

Yes, it was the problem of the namespace. Sorry for bugging for such a silly


On Mon, Apr 19, 2010 at 9:33 AM, John Criswell <criswell at uiuc.edu> wrote:

> Pranav Garg wrote:
>> Hi,
>> I am trying to debug my llvm pass called -aa-eval-garg11 using gdb.
>> However I am not able to establish a breakpoint in any function of my pass.
>> I have compiled my
>> pass with a debug build and I have also compiled the input file (using
>> llvm-gcc) with the -g flag. Given below is the exact output.
>> (gdb) break llvm::PassManager::run
>> Breakpoint 1 at 0x86be87c: file
>> /home/engr/cs426/llvm/llvm-2.6/lib/VMCore/PassManager.cpp, line 1558.
>> (gdb) run pointer.bc -load ../Debug/lib/libMP1.so -basicaa -aa-eval-garg11
>> Starting program: /home/engr/cs426/llvm/llvm-2.6-x86/Debug/bin/opt
>> pointer.bc -load ../Debug/lib/libMP1.so -basicaa -aa-eval-garg11
>> [Thread debugging using libthread_db enabled]
>> Breakpoint 1, llvm::PassManager::run (this=0xbfffe6f0, M=...) at
>> /home/engr/cs426/llvm/llvm-2.6/lib/VMCore/PassManager.cpp:1558
>> 1558      return PM->run(M);
>> (gdb) break llvm::AAEvalTemp::PointsToFunc
>> Can't find member of namespace, class, struct, or union named
>> "llvm::AAEvalTemp::PointsToFunc"
>> Hint: try 'llvm::AAEvalTemp::PointsToFunc<TAB> or
>> 'llvm::AAEvalTemp::PointsToFunc<ESC-?>
>> (Note leading single quote.)
>> Make breakpoint pending on future shared library load? (y or [n]) n
>> Is there some clear mistake in my way of using the gdb ?
> Are you sure that your pass is declared within the llvm namespace?  Use the
> nm program on libMP1.so to see if AAEvalTemp::PointsToFunc is declared in
> the llvm namespace or not.  Note: you may need to pipe the output of nm
> through c++filt to get readable results.
> -- John T.
>> Thanks.
>> Pranav
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