[llvm-dev] Conflicts with custom passes

[Mehdi AMINI via llvm-dev]

On Fri, Jun 28, 2019 at 4:21 PM Kihong Heo via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> You are right. Thanks!
> I fixed that one as well as some other issues.
> I built LLVM-8 with Debug + no-rtti. But it now has the following error:
>
> Stack dump:
> 0.      Program arguments: clang-8 -cc1 -triple x86_64-unknown-linux-gnu
> -emit-llvm -disable-free -main-file-name time-1.7.c -mrelocation-model
> static -mthread-model posix -mdisable-fp-elim -fmath-errno -masm-verbose
> -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64
> -dwarf-column-info -debugger-tuning=gdb -coverage-notes-file
> /home/khheo/project/parametric-symexe/test/toy1/time-1.7.gcno -resource-dir
> /home/khheo/project/llvm-8/build/lib/clang/8.0.1 -internal-isystem
> /usr/local/include -internal-isystem
> /home/khheo/project/llvm-8/build/lib/clang/8.0.1/include
> -internal-externc-isystem /usr/include/x86_64-linux-gnu
> -internal-externc-isystem /include -internal-externc-isystem /usr/include
> -O0 -fdebug-compilation-dir /home/khheo/project/parametric-symexe/test/toy1
> -ferror-limit 19 -fmessage-length 364 -fobjc-runtime=gcc
> -fdiagnostics-show-option -fcolor-diagnostics -load
> ../../trace-extractor/build/TracePass.so -o time-1.7.ll -x c
> /home/khheo/project/all/time-1.7.c -faddrsig
> 1.      <eof> parser at end of file
> 2.      Per-module optimization passes
> 3.      Running pass 'Unnamed pass: implement Pass::getPassName()' on
> module '/home/khheo/project/all/time-1.7.c'.
> …
>
> What does "Running pass 'Unnamed pass: implement Pass::getPassName()' on
> module” mean?
>

It is just debugging on crashes, passes can override this method:
https://github.com/llvm/llvm-project/blob/master/llvm/include/llvm/Pass.h#L96
to provide a more readable name.
In practice if passes are registered it isn't needed I think.
In any case this is not the cause of the crash, you can try running the
clang -cc1 command in a debugger.

-- 
Mehdi



>
> - Kihong
>
>
> > On Jun 28, 2019, at 4:48 PM, Tim Northover <t.p.northover at gmail.com>
> wrote:
> >
> > On Fri, 28 Jun 2019 at 21:18, Kihong Heo <kihong.heo at gmail.com> wrote:
> >> When I search for this issue on Google, it seems to be relevant to
> “RTTI”.
> >
> > Yep, that's a typeinfo symbol.
> >
> >> But as I know LLVM is built by default -fno-rtti. I also explicitly
> turned off it. Here is my cmake command:
> >>
> >> $ cmake -DCMAKE_BUILD_TYPE=Debug -DLLVM_ENABLE_RTTI=OFF
> -DLLVM_ENABLE_PROJECTS=clang -G "Unix Makefiles"  ../llvm
> >>
> >> Any thought?
> >
> > My best guess is that your pass was built *with* RTTI (i.e. no
> > -fno-rtti) but LLVM without. A quick fix would be to switch to
> > -DLLVM_ENABLE_RTTI=ON, but longer term you may want to look into your
> > pass's build system.
> >
> > Cheers.
> >
> > tim.
>
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